sys/net/sppp/if_spppsubr.c

   1 /*
   2  * Synchronous PPP/Cisco link level subroutines.
   3  * Keepalive protocol implemented in both Cisco and PPP modes.
   4  *
   5  * Copyright (C) 1994-1996 Cronyx Engineering Ltd.
   6  * Author: Serge Vakulenko, <vak@cronyx.ru>
   7  *
   8  * Heavily revamped to conform to RFC 1661.
   9  * Copyright (C) 1997, 2001 Joerg Wunsch.
  10  *
  11  * This software is distributed with NO WARRANTIES, not even the implied
  12  * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  *
  14  * Authors grant any other persons or organisations permission to use
  15  * or modify this software as long as this message is kept with the software,
  16  * all derivative works or modified versions.
  17  *
  18  * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997
  19  *
  20  * $FreeBSD: src/sys/net/if_spppsubr.c,v 1.59.2.13 2002/07/03 15:44:41 joerg Exp $
  21  * $DragonFly: src/sys/net/sppp/if_spppsubr.c,v 1.27 2006/12/20 18:14:42 dillon Exp $
  22  */
  23
  24 #include <sys/param.h>
  25
  26 #if defined(__DragonFly__)
  27 #include "opt_inet.h"
  28 #include "opt_inet6.h"
  29 #include "opt_ipx.h"
  30 #endif
  31
  32 #ifdef NetBSD1_3
  33 #  if NetBSD1_3 > 6
  34 #      include "opt_inet.h"
  35 #      include "opt_inet6.h"
  36 #      include "opt_iso.h"
  37 #  endif
  38 #endif
  39
  40 #include <sys/systm.h>
  41 #include <sys/kernel.h>
  42 #include <sys/module.h>
  43 #include <sys/sockio.h>
  44 #include <sys/socket.h>
  45 #include <sys/syslog.h>
  46 #if defined(__DragonFly__)
  47 #include <sys/random.h>
  48 #include <sys/thread2.h>
  49 #endif
  50 #include <sys/malloc.h>
  51 #include <sys/mbuf.h>
  52
  53 #if defined (__OpenBSD__)
  54 #include <sys/md5k.h>
  55 #else
  56 #include <sys/md5.h>
  57 #endif
  58
  59 #include <net/if.h>
  60 #include <net/ifq_var.h>
  61 #include <net/netisr.h>
  62 #include <net/if_types.h>
  63 #include <net/route.h>
  64 #include <netinet/in.h>
  65 #include <netinet/in_systm.h>
  66 #include <netinet/ip.h>
  67 #include <net/slcompress.h>
  68
  69 #if defined (__NetBSD__) || defined (__OpenBSD__)
  70 #include <machine/cpu.h> /* XXX for softnet */
  71 #endif
  72
  73 #include <machine/stdarg.h>
  74
  75 #include <netinet/in.h>
  76 #include <netinet/in_systm.h>
  77 #include <netinet/in_var.h>
  78
  79 #ifdef INET
  80 #include <netinet/ip.h>
  81 #include <netinet/tcp.h>
  82 #endif
  83
  84 #if defined (__DragonFly__) || defined (__OpenBSD__)
  85 # include <netinet/if_ether.h>
  86 #else
  87 # include <net/ethertypes.h>
  88 #endif
  89
  90 #ifdef IPX
  91 #include <netproto/ipx/ipx.h>
  92 #include <netproto/ipx/ipx_if.h>
  93 #endif
  94
  95 #ifdef NS
  96 #include <netns/ns.h>
  97 #include <netns/ns_if.h>
  98 #endif
  99
 100 #include "if_sppp.h"
 101
 102 #define IOCTL_CMD_T     u_long
 103 #define MAXALIVECNT     3               /* max. alive packets */
 104
 105 /*
 106  * Interface flags that can be set in an ifconfig command.
 107  *
 108  * Setting link0 will make the link passive, i.e. it will be marked
 109  * as being administrative openable, but won't be opened to begin
 110  * with.  Incoming calls will be answered, or subsequent calls with
 111  * -link1 will cause the administrative open of the LCP layer.
 112  *
 113  * Setting link1 will cause the link to auto-dial only as packets
 114  * arrive to be sent.
 115  *
 116  * Setting IFF_DEBUG will syslog the option negotiation and state
 117  * transitions at level kern.debug.  Note: all logs consistently look
 118  * like
 119  *
 120  *   <if-name><unit>: <proto-name> <additional info...>
 121  *
 122  * with <if-name><unit> being something like "bppp0", and <proto-name>
 123  * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
 124  */
 125
 126 #define IFF_PASSIVE     IFF_LINK0       /* wait passively for connection */
 127 #define IFF_AUTO        IFF_LINK1       /* auto-dial on output */
 128 #define IFF_CISCO       IFF_LINK2       /* auto-dial on output */
 129
 130 #define PPP_ALLSTATIONS 0xff            /* All-Stations broadcast address */
 131 #define PPP_UI          0x03            /* Unnumbered Information */
 132 #define PPP_IP          0x0021          /* Internet Protocol */
 133 #define PPP_ISO         0x0023          /* ISO OSI Protocol */
 134 #define PPP_XNS         0x0025          /* Xerox NS Protocol */
 135 #define PPP_IPX         0x002b          /* Novell IPX Protocol */
 136 #define PPP_VJ_COMP     0x002d          /* VJ compressed TCP/IP */
 137 #define PPP_VJ_UCOMP    0x002f          /* VJ uncompressed TCP/IP */
 138 #define PPP_IPV6        0x0057          /* Internet Protocol Version 6 */
 139 #define PPP_LCP         0xc021          /* Link Control Protocol */
 140 #define PPP_PAP         0xc023          /* Password Authentication Protocol */
 141 #define PPP_CHAP        0xc223          /* Challenge-Handshake Auth Protocol */
 142 #define PPP_IPCP        0x8021          /* Internet Protocol Control Protocol */
 143 #define PPP_IPV6CP      0x8057          /* IPv6 Control Protocol */
 144
 145 #define CONF_REQ        1               /* PPP configure request */
 146 #define CONF_ACK        2               /* PPP configure acknowledge */
 147 #define CONF_NAK        3               /* PPP configure negative ack */
 148 #define CONF_REJ        4               /* PPP configure reject */
 149 #define TERM_REQ        5               /* PPP terminate request */
 150 #define TERM_ACK        6               /* PPP terminate acknowledge */
 151 #define CODE_REJ        7               /* PPP code reject */
 152 #define PROTO_REJ       8               /* PPP protocol reject */
 153 #define ECHO_REQ        9               /* PPP echo request */
 154 #define ECHO_REPLY      10              /* PPP echo reply */
 155 #define DISC_REQ        11              /* PPP discard request */
 156
 157 #define LCP_OPT_MRU             1       /* maximum receive unit */
 158 #define LCP_OPT_ASYNC_MAP       2       /* async control character map */
 159 #define LCP_OPT_AUTH_PROTO      3       /* authentication protocol */
 160 #define LCP_OPT_QUAL_PROTO      4       /* quality protocol */
 161 #define LCP_OPT_MAGIC           5       /* magic number */
 162 #define LCP_OPT_RESERVED        6       /* reserved */
 163 #define LCP_OPT_PROTO_COMP      7       /* protocol field compression */
 164 #define LCP_OPT_ADDR_COMP       8       /* address/control field compression */
 165
 166 #define IPCP_OPT_ADDRESSES      1       /* both IP addresses; deprecated */
 167 #define IPCP_OPT_COMPRESSION    2       /* IP compression protocol (VJ) */
 168 #define IPCP_OPT_ADDRESS        3       /* local IP address */
 169
 170 #define IPV6CP_OPT_IFID 1       /* interface identifier */
 171 #define IPV6CP_OPT_COMPRESSION  2       /* IPv6 compression protocol */
 172
 173 #define IPCP_COMP_VJ            0x2d    /* Code for VJ compression */
 174
 175 #define PAP_REQ                 1       /* PAP name/password request */
 176 #define PAP_ACK                 2       /* PAP acknowledge */
 177 #define PAP_NAK                 3       /* PAP fail */
 178
 179 #define CHAP_CHALLENGE          1       /* CHAP challenge request */
 180 #define CHAP_RESPONSE           2       /* CHAP challenge response */
 181 #define CHAP_SUCCESS            3       /* CHAP response ok */
 182 #define CHAP_FAILURE            4       /* CHAP response failed */
 183
 184 #define CHAP_MD5                5       /* hash algorithm - MD5 */
 185
 186 #define CISCO_MULTICAST         0x8f    /* Cisco multicast address */
 187 #define CISCO_UNICAST           0x0f    /* Cisco unicast address */
 188 #define CISCO_KEEPALIVE         0x8035  /* Cisco keepalive protocol */
 189 #define CISCO_ADDR_REQ          0       /* Cisco address request */
 190 #define CISCO_ADDR_REPLY        1       /* Cisco address reply */
 191 #define CISCO_KEEPALIVE_REQ     2       /* Cisco keepalive request */
 192
 193 /* states are named and numbered according to RFC 1661 */
 194 #define STATE_INITIAL   0
 195 #define STATE_STARTING  1
 196 #define STATE_CLOSED    2
 197 #define STATE_STOPPED   3
 198 #define STATE_CLOSING   4
 199 #define STATE_STOPPING  5
 200 #define STATE_REQ_SENT  6
 201 #define STATE_ACK_RCVD  7
 202 #define STATE_ACK_SENT  8
 203 #define STATE_OPENED    9
 204
 205 struct ppp_header {
 206         u_char address;
 207         u_char control;
 208         u_short protocol;
 209 } __attribute__((__packed__));
 210 #define PPP_HEADER_LEN          sizeof (struct ppp_header)
 211
 212 struct lcp_header {
 213         u_char type;
 214         u_char ident;
 215         u_short len;
 216 } __attribute__((__packed__));
 217 #define LCP_HEADER_LEN          sizeof (struct lcp_header)
 218
 219 struct cisco_packet {
 220         u_long type;
 221         u_long par1;
 222         u_long par2;
 223         u_short rel;
 224         u_short time0;
 225         u_short time1;
 226 } __attribute__((__packed__));
 227 #define CISCO_PACKET_LEN        sizeof (struct cisco_packet)
 228
 229 /*
 230  * We follow the spelling and capitalization of RFC 1661 here, to make
 231  * it easier comparing with the standard.  Please refer to this RFC in
 232  * case you can't make sense out of these abbreviation; it will also
 233  * explain the semantics related to the various events and actions.
 234  */
 235 struct cp {
 236         u_short proto;          /* PPP control protocol number */
 237         u_char protoidx;        /* index into state table in struct sppp */
 238         u_char flags;
 239 #define CP_LCP          0x01    /* this is the LCP */
 240 #define CP_AUTH         0x02    /* this is an authentication protocol */
 241 #define CP_NCP          0x04    /* this is a NCP */
 242 #define CP_QUAL         0x08    /* this is a quality reporting protocol */
 243         const char *name;       /* name of this control protocol */
 244         /* event handlers */
 245         void    (*Up)(struct sppp *sp);
 246         void    (*Down)(struct sppp *sp);
 247         void    (*Open)(struct sppp *sp);
 248         void    (*Close)(struct sppp *sp);
 249         void    (*TO)(void *sp);
 250         int     (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
 251         void    (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
 252         void    (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
 253         /* actions */
 254         void    (*tlu)(struct sppp *sp);
 255         void    (*tld)(struct sppp *sp);
 256         void    (*tls)(struct sppp *sp);
 257         void    (*tlf)(struct sppp *sp);
 258         void    (*scr)(struct sppp *sp);
 259 };
 260
 261 static struct sppp *spppq;
 262 #if defined(__DragonFly__)
 263 static struct callout keepalive_timeout;
 264 #endif
 265
 266 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 && !defined(__DragonFly__)
 267 #define SPP_FMT         "%s%d: "
 268 #define SPP_ARGS(ifp)   (ifp)->if_name, (ifp)->if_unit
 269 #else
 270 #define SPP_FMT         "%s: "
 271 #define SPP_ARGS(ifp)   (ifp)->if_xname
 272 #endif
 273
 274 #ifdef INET
 275 /*
 276  * The following disgusting hack gets around the problem that IP TOS
 277  * can't be set yet.  We want to put "interactive" traffic on a high
 278  * priority queue.  To decide if traffic is interactive, we check that
 279  * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
 280  *
 281  * XXX is this really still necessary?  - joerg -
 282  */
 283 static u_short interactive_ports[8] = {
 284         0,      513,    0,      0,
 285         0,      21,     0,      23,
 286 };
 287 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
 288 #endif
 289
 290 /* almost every function needs these */
 291 #define STDDCL                                                  \
 292         struct ifnet *ifp = &sp->pp_if;                         \
 293         int debug = ifp->if_flags & IFF_DEBUG
 294
 295 static int sppp_output(struct ifnet *ifp, struct mbuf *m,
 296                        struct sockaddr *dst, struct rtentry *rt);
 297
 298 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
 299 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
 300
 301 static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
 302                           struct mbuf *m);
 303 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
 304                          u_char ident, u_short len, void *data);
 305 /* static void sppp_cp_timeout(void *arg); */
 306 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
 307                                  int newstate);
 308 static void sppp_auth_send(const struct cp *cp,
 309                            struct sppp *sp, unsigned int type, unsigned int id,
 310                            ...);
 311
 312 static void sppp_up_event(const struct cp *cp, struct sppp *sp);
 313 static void sppp_down_event(const struct cp *cp, struct sppp *sp);
 314 static void sppp_open_event(const struct cp *cp, struct sppp *sp);
 315 static void sppp_close_event(const struct cp *cp, struct sppp *sp);
 316 static void sppp_to_event(const struct cp *cp, struct sppp *sp);
 317
 318 static void sppp_null(struct sppp *sp);
 319
 320 static void sppp_lcp_init(struct sppp *sp);
 321 static void sppp_lcp_up(struct sppp *sp);
 322 static void sppp_lcp_down(struct sppp *sp);
 323 static void sppp_lcp_open(struct sppp *sp);
 324 static void sppp_lcp_close(struct sppp *sp);
 325 static void sppp_lcp_TO(void *sp);
 326 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 327 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 328 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 329 static void sppp_lcp_tlu(struct sppp *sp);
 330 static void sppp_lcp_tld(struct sppp *sp);
 331 static void sppp_lcp_tls(struct sppp *sp);
 332 static void sppp_lcp_tlf(struct sppp *sp);
 333 static void sppp_lcp_scr(struct sppp *sp);
 334 static void sppp_lcp_check_and_close(struct sppp *sp);
 335 static int sppp_ncp_check(struct sppp *sp);
 336
 337 static void sppp_ipcp_init(struct sppp *sp);
 338 static void sppp_ipcp_up(struct sppp *sp);
 339 static void sppp_ipcp_down(struct sppp *sp);
 340 static void sppp_ipcp_open(struct sppp *sp);
 341 static void sppp_ipcp_close(struct sppp *sp);
 342 static void sppp_ipcp_TO(void *sp);
 343 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 344 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 345 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 346 static void sppp_ipcp_tlu(struct sppp *sp);
 347 static void sppp_ipcp_tld(struct sppp *sp);
 348 static void sppp_ipcp_tls(struct sppp *sp);
 349 static void sppp_ipcp_tlf(struct sppp *sp);
 350 static void sppp_ipcp_scr(struct sppp *sp);
 351
 352 static void sppp_ipv6cp_init(struct sppp *sp);
 353 static void sppp_ipv6cp_up(struct sppp *sp);
 354 static void sppp_ipv6cp_down(struct sppp *sp);
 355 static void sppp_ipv6cp_open(struct sppp *sp);
 356 static void sppp_ipv6cp_close(struct sppp *sp);
 357 static void sppp_ipv6cp_TO(void *sp);
 358 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 359 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 360 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 361 static void sppp_ipv6cp_tlu(struct sppp *sp);
 362 static void sppp_ipv6cp_tld(struct sppp *sp);
 363 static void sppp_ipv6cp_tls(struct sppp *sp);
 364 static void sppp_ipv6cp_tlf(struct sppp *sp);
 365 static void sppp_ipv6cp_scr(struct sppp *sp);
 366
 367 static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
 368 static void sppp_pap_init(struct sppp *sp);
 369 static void sppp_pap_open(struct sppp *sp);
 370 static void sppp_pap_close(struct sppp *sp);
 371 static void sppp_pap_TO(void *sp);
 372 static void sppp_pap_my_TO(void *sp);
 373 static void sppp_pap_tlu(struct sppp *sp);
 374 static void sppp_pap_tld(struct sppp *sp);
 375 static void sppp_pap_scr(struct sppp *sp);
 376
 377 static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
 378 static void sppp_chap_init(struct sppp *sp);
 379 static void sppp_chap_open(struct sppp *sp);
 380 static void sppp_chap_close(struct sppp *sp);
 381 static void sppp_chap_TO(void *sp);
 382 static void sppp_chap_tlu(struct sppp *sp);
 383 static void sppp_chap_tld(struct sppp *sp);
 384 static void sppp_chap_scr(struct sppp *sp);
 385
 386 static const char *sppp_auth_type_name(u_short proto, u_char type);
 387 static const char *sppp_cp_type_name(u_char type);
 388 static const char *sppp_dotted_quad(u_long addr);
 389 static const char *sppp_ipcp_opt_name(u_char opt);
 390 #ifdef INET6
 391 static const char *sppp_ipv6cp_opt_name(u_char opt);
 392 #endif
 393 static const char *sppp_lcp_opt_name(u_char opt);
 394 static const char *sppp_phase_name(enum ppp_phase phase);
 395 static const char *sppp_proto_name(u_short proto);
 396 static const char *sppp_state_name(int state);
 397 static int sppp_params(struct sppp *sp, u_long cmd, void *data);
 398 static int sppp_strnlen(u_char *p, int max);
 399 static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst,
 400                               u_long *srcmask);
 401 static void sppp_keepalive(void *dummy);
 402 static void sppp_phase_network(struct sppp *sp);
 403 static void sppp_print_bytes(const u_char *p, u_short len);
 404 static void sppp_print_string(const char *p, u_short len);
 405 static void sppp_set_ip_addr(struct sppp *sp, u_long src);
 406 #ifdef INET6
 407 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src,
 408                                struct in6_addr *dst, struct in6_addr *srcmask);
 409 #ifdef IPV6CP_MYIFID_DYN
 410 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src);
 411 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src);
 412 #endif
 413 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src);
 414 #endif
 415
 416 /* our control protocol descriptors */
 417 static const struct cp lcp = {
 418         PPP_LCP, IDX_LCP, CP_LCP, "lcp",
 419         sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
 420         sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
 421         sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
 422         sppp_lcp_scr
 423 };
 424
 425 static const struct cp ipcp = {
 426         PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp",
 427         sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
 428         sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
 429         sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
 430         sppp_ipcp_scr
 431 };
 432
 433 static const struct cp ipv6cp = {
 434         PPP_IPV6CP, IDX_IPV6CP,
 435 #ifdef INET6    /*don't run IPv6CP if there's no IPv6 support*/
 436         CP_NCP,
 437 #else
 438         0,
 439 #endif
 440         "ipv6cp",
 441         sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close,
 442         sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak,
 443         sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf,
 444         sppp_ipv6cp_scr
 445 };
 446
 447 static const struct cp pap = {
 448         PPP_PAP, IDX_PAP, CP_AUTH, "pap",
 449         sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
 450         sppp_pap_TO, 0, 0, 0,
 451         sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
 452         sppp_pap_scr
 453 };
 454
 455 static const struct cp chap = {
 456         PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
 457         sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
 458         sppp_chap_TO, 0, 0, 0,
 459         sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
 460         sppp_chap_scr
 461 };
 462
 463 static const struct cp *cps[IDX_COUNT] = {
 464         &lcp,                   /* IDX_LCP */
 465         &ipcp,                  /* IDX_IPCP */
 466         &ipv6cp,                /* IDX_IPV6CP */
 467         &pap,                   /* IDX_PAP */
 468         &chap,                  /* IDX_CHAP */
 469 };
 470
 471 static int
 472 sppp_modevent(module_t mod, int type, void *unused)
 473 {
 474         switch (type) {
 475         case MOD_LOAD:
 476                 break;
 477         case MOD_UNLOAD:
 478                 return EACCES;
 479                 break;
 480         default:
 481                 break;
 482         }
 483         return 0;
 484 }
 485 static moduledata_t spppmod = {
 486         "sppp",
 487         sppp_modevent,
 488         0
 489 };
 490 MODULE_VERSION(sppp, 1);
 491 DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY);
 492
 493 /*
 494  * Exported functions, comprising our interface to the lower layer.
 495  */
 496
 497 /*
 498  * Process the received packet.
 499  */
 500 void
 501 sppp_input(struct ifnet *ifp, struct mbuf *m)
 502 {
 503         struct ppp_header *h;
 504         int isr = -1;
 505         struct sppp *sp = (struct sppp *)ifp;
 506         u_char *iphdr;
 507         int hlen, vjlen, do_account = 0;
 508         int debug = ifp->if_flags & IFF_DEBUG;
 509
 510         if (ifp->if_flags & IFF_UP)
 511                 /* Count received bytes, add FCS and one flag */
 512                 ifp->if_ibytes += m->m_pkthdr.len + 3;
 513
 514         if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
 515                 /* Too small packet, drop it. */
 516                 if (debug)
 517                         log(LOG_DEBUG,
 518                             SPP_FMT "input packet is too small, %d bytes\n",
 519                             SPP_ARGS(ifp), m->m_pkthdr.len);
 520           drop:
 521                 m_freem (m);
 522           drop2:
 523                 ++ifp->if_ierrors;
 524                 ++ifp->if_iqdrops;
 525                 return;
 526         }
 527
 528         /* Get PPP header. */
 529         h = mtod (m, struct ppp_header*);
 530         m_adj (m, PPP_HEADER_LEN);
 531
 532         switch (h->address) {
 533         case PPP_ALLSTATIONS:
 534                 if (h->control != PPP_UI)
 535                         goto invalid;
 536                 if (sp->pp_mode == IFF_CISCO) {
 537                         if (debug)
 538                                 log(LOG_DEBUG,
 539                                     SPP_FMT "PPP packet in Cisco mode "
 540                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 541                                     SPP_ARGS(ifp),
 542                                     h->address, h->control, ntohs(h->protocol));
 543                         goto drop;
 544                 }
 545                 switch (ntohs (h->protocol)) {
 546                 default:
 547                         if (debug)
 548                                 log(LOG_DEBUG,
 549                                     SPP_FMT "rejecting protocol "
 550                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 551                                     SPP_ARGS(ifp),
 552                                     h->address, h->control, ntohs(h->protocol));
 553                         if (sp->state[IDX_LCP] == STATE_OPENED)
 554                                 sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
 555                                         ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2,
 556                                         &h->protocol);
 557                         ++ifp->if_noproto;
 558                         goto drop;
 559                 case PPP_LCP:
 560                         sppp_cp_input(&lcp, sp, m);
 561                         m_freem (m);
 562                         return;
 563                 case PPP_PAP:
 564                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
 565                                 sppp_pap_input(sp, m);
 566                         m_freem (m);
 567                         return;
 568                 case PPP_CHAP:
 569                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
 570                                 sppp_chap_input(sp, m);
 571                         m_freem (m);
 572                         return;
 573 #ifdef INET
 574                 case PPP_IPCP:
 575                         if (sp->pp_phase == PHASE_NETWORK)
 576                                 sppp_cp_input(&ipcp, sp, m);
 577                         m_freem (m);
 578                         return;
 579                 case PPP_IP:
 580                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 581                                 isr = NETISR_IP;
 582                         }
 583                         do_account++;
 584                         break;
 585                 case PPP_VJ_COMP:
 586                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 587                                 if ((vjlen =
 588                                      sl_uncompress_tcp_core(mtod(m, u_char *),
 589                                                             m->m_len, m->m_len,
 590                                                             TYPE_COMPRESSED_TCP,
 591                                                             sp->pp_comp,
 592                                                             &iphdr, &hlen)) <= 0) {
 593                                         if (debug)
 594                                                 log(LOG_INFO,
 595                             SPP_FMT "VJ uncompress failed on compressed packet\n",
 596                                                     SPP_ARGS(ifp));
 597                                         goto drop;
 598                                 }
 599
 600                                 /*
 601                                  * Trim the VJ header off the packet, and prepend
 602                                  * the uncompressed IP header (which will usually
 603                                  * end up in two chained mbufs since there's not
 604                                  * enough leading space in the existing mbuf).
 605                                  */
 606                                 m_adj(m, vjlen);
 607                                 M_PREPEND(m, hlen, MB_DONTWAIT);
 608                                 if (m == NULL)
 609                                         goto drop2;
 610                                 bcopy(iphdr, mtod(m, u_char *), hlen);
 611
 612                                 isr = NETISR_IP;
 613                         }
 614                         do_account++;
 615                         break;
 616                 case PPP_VJ_UCOMP:
 617                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 618                                 if (sl_uncompress_tcp_core(mtod(m, u_char *),
 619                                                            m->m_len, m->m_len,
 620                                                            TYPE_UNCOMPRESSED_TCP,
 621                                                            sp->pp_comp,
 622                                                            &iphdr, &hlen) != 0) {
 623                                         if (debug)
 624                                                 log(LOG_INFO,
 625                             SPP_FMT "VJ uncompress failed on uncompressed packet\n",
 626                                                     SPP_ARGS(ifp));
 627                                         goto drop;
 628                                 }
 629                                 isr = NETISR_IP;
 630                         }
 631                         do_account++;
 632                         break;
 633 #endif
 634 #ifdef INET6
 635                 case PPP_IPV6CP:
 636                         if (sp->pp_phase == PHASE_NETWORK)
 637                             sppp_cp_input(&ipv6cp, sp, m);
 638                         m_freem (m);
 639                         return;
 640
 641                 case PPP_IPV6:
 642                         if (sp->state[IDX_IPV6CP] == STATE_OPENED) {
 643                                 isr = NETISR_IPV6;
 644                         }
 645                         do_account++;
 646                         break;
 647 #endif
 648 #ifdef IPX
 649                 case PPP_IPX:
 650                         /* IPX IPXCP not implemented yet */
 651                         if (sp->pp_phase == PHASE_NETWORK) {
 652                                 isr = NETISR_IPX;
 653                         }
 654                         do_account++;
 655                         break;
 656 #endif
 657 #ifdef NS
 658                 case PPP_XNS:
 659                         /* XNS IDPCP not implemented yet */
 660                         if (sp->pp_phase == PHASE_NETWORK) {
 661                                 isr = NETISR_NS;
 662                         }
 663                         do_account++;
 664                         break;
 665 #endif
 666                 }
 667                 break;
 668         case CISCO_MULTICAST:
 669         case CISCO_UNICAST:
 670                 /* Don't check the control field here (RFC 1547). */
 671                 if (sp->pp_mode != IFF_CISCO) {
 672                         if (debug)
 673                                 log(LOG_DEBUG,
 674                                     SPP_FMT "Cisco packet in PPP mode "
 675                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 676                                     SPP_ARGS(ifp),
 677                                     h->address, h->control, ntohs(h->protocol));
 678                         goto drop;
 679                 }
 680                 switch (ntohs (h->protocol)) {
 681                 default:
 682                         ++ifp->if_noproto;
 683                         goto invalid;
 684                 case CISCO_KEEPALIVE:
 685                         sppp_cisco_input ((struct sppp*) ifp, m);
 686                         m_freem (m);
 687                         return;
 688 #ifdef INET
 689                 case ETHERTYPE_IP:
 690                         isr = NETISR_IP;
 691                         do_account++;
 692                         break;
 693 #endif
 694 #ifdef INET6
 695                 case ETHERTYPE_IPV6:
 696                         isr = NETISR_IPV6;
 697                         do_account++;
 698                         break;
 699 #endif
 700 #ifdef IPX
 701                 case ETHERTYPE_IPX:
 702                         isr = NETISR_IPX;
 703                         do_account++;
 704                         break;
 705 #endif
 706 #ifdef NS
 707                 case ETHERTYPE_NS:
 708                         isr = NETISR_NS
 709                         do_account++;
 710                         break;
 711 #endif
 712                 }
 713                 break;
 714         default:        /* Invalid PPP packet. */
 715           invalid:
 716                 if (debug)
 717                         log(LOG_DEBUG,
 718                             SPP_FMT "invalid input packet "
 719                             "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 720                             SPP_ARGS(ifp),
 721                             h->address, h->control, ntohs(h->protocol));
 722                 goto drop;
 723         }
 724
 725         if (! (ifp->if_flags & IFF_UP) || isr < 0)
 726                 goto drop;
 727
 728         /* Check queue. */
 729
 730         netisr_dispatch(isr, m);
 731         if (do_account)
 732                 /*
 733                  * Do only account for network packets, not for control
 734                  * packets.  This is used by some subsystems to detect
 735                  * idle lines.
 736                  */
 737                 sp->pp_last_recv = time_second;
 738 }
 739
 740 /*
 741  * Enqueue transmit packet.
 742  */
 743 static int
 744 sppp_output(struct ifnet *ifp, struct mbuf *m,
 745             struct sockaddr *dst, struct rtentry *rt)
 746 {
 747         struct sppp *sp = (struct sppp*) ifp;
 748         struct ppp_header *h;
 749         struct ifqueue *ifq = NULL;
 750         int rv = 0;
 751         int ipproto = PPP_IP;
 752         int debug = ifp->if_flags & IFF_DEBUG;
 753         struct altq_pktattr pktattr;
 754
 755         crit_enter();
 756
 757         if ((ifp->if_flags & IFF_UP) == 0 ||
 758             (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) {
 759 #ifdef INET6
 760           drop:
 761 #endif
 762                 m_freem (m);
 763                 crit_exit();
 764                 return (ENETDOWN);
 765         }
 766
 767         if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) {
 768 #ifdef INET6
 769                 /*
 770                  * XXX
 771                  *
 772                  * Hack to prevent the initialization-time generated
 773                  * IPv6 multicast packet to erroneously cause a
 774                  * dialout event in case IPv6 has been
 775                  * administratively disabled on that interface.
 776                  */
 777                 if (dst->sa_family == AF_INET6 &&
 778                     !(sp->confflags & CONF_ENABLE_IPV6))
 779                         goto drop;
 780 #endif
 781                 /*
 782                  * Interface is not yet running, but auto-dial.  Need
 783                  * to start LCP for it.
 784                  */
 785                 ifp->if_flags |= IFF_RUNNING;
 786                 crit_exit();
 787                 lcp.Open(sp);
 788                 crit_enter();
 789         }
 790
 791         /*
 792          * if the queueing discipline needs packet classification,
 793          * do it before prepending link headers.
 794          */
 795         ifq_classify(&ifp->if_snd, m, dst->sa_family, &pktattr);
 796
 797 #ifdef INET
 798         if (dst->sa_family == AF_INET) {
 799                 /* XXX Check mbuf length here? */
 800                 struct ip *ip = mtod (m, struct ip*);
 801                 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
 802
 803                 /*
 804                  * When using dynamic local IP address assignment by using
 805                  * 0.0.0.0 as a local address, the first TCP session will
 806                  * not connect because the local TCP checksum is computed
 807                  * using 0.0.0.0 which will later become our real IP address
 808                  * so the TCP checksum computed at the remote end will
 809                  * become invalid. So we
 810                  * - don't let packets with src ip addr 0 thru
 811                  * - we flag TCP packets with src ip 0 as an error
 812                  */
 813
 814                 if(ip->ip_src.s_addr == INADDR_ANY)     /* -hm */
 815                 {
 816                         m_freem(m);
 817                         crit_exit();
 818                         if(ip->ip_p == IPPROTO_TCP)
 819                                 return(EADDRNOTAVAIL);
 820                         else
 821                                 return(0);
 822                 }
 823
 824                 /*
 825                  * Put low delay, telnet, rlogin and ftp control packets
 826                  * in front of the queue.
 827                  */
 828                 if (IF_QFULL (&sp->pp_fastq))
 829                         ;
 830                 else if (ip->ip_tos & IPTOS_LOWDELAY)
 831                         ifq = &sp->pp_fastq;
 832                 else if (m->m_len < sizeof *ip + sizeof *tcp)
 833                         ;
 834                 else if (ip->ip_p != IPPROTO_TCP)
 835                         ;
 836                 else if (INTERACTIVE (ntohs (tcp->th_sport)))
 837                         ifq = &sp->pp_fastq;
 838                 else if (INTERACTIVE (ntohs (tcp->th_dport)))
 839                         ifq = &sp->pp_fastq;
 840
 841                 /*
 842                  * Do IP Header compression
 843                  */
 844                 if (sp->pp_mode != IFF_CISCO && (sp->ipcp.flags & IPCP_VJ) &&
 845                     ip->ip_p == IPPROTO_TCP)
 846                         switch (sl_compress_tcp(m, ip, sp->pp_comp,
 847                                                 sp->ipcp.compress_cid)) {
 848                         case TYPE_COMPRESSED_TCP:
 849                                 ipproto = PPP_VJ_COMP;
 850                                 break;
 851                         case TYPE_UNCOMPRESSED_TCP:
 852                                 ipproto = PPP_VJ_UCOMP;
 853                                 break;
 854                         case TYPE_IP:
 855                                 ipproto = PPP_IP;
 856                                 break;
 857                         default:
 858                                 m_freem(m);
 859                                 crit_exit();
 860                                 return (EINVAL);
 861                         }
 862         }
 863 #endif
 864
 865 #ifdef INET6
 866         if (dst->sa_family == AF_INET6) {
 867                 /* XXX do something tricky here? */
 868         }
 869 #endif
 870
 871         /*
 872          * Prepend general data packet PPP header. For now, IP only.
 873          */
 874         M_PREPEND (m, PPP_HEADER_LEN, MB_DONTWAIT);
 875         if (! m) {
 876                 if (debug)
 877                         log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
 878                                 SPP_ARGS(ifp));
 879                 ++ifp->if_oerrors;
 880                 crit_exit();
 881                 return (ENOBUFS);
 882         }
 883         /*
 884          * May want to check size of packet
 885          * (albeit due to the implementation it's always enough)
 886          */
 887         h = mtod (m, struct ppp_header*);
 888         if (sp->pp_mode == IFF_CISCO) {
 889                 h->address = CISCO_UNICAST;        /* unicast address */
 890                 h->control = 0;
 891         } else {
 892                 h->address = PPP_ALLSTATIONS;        /* broadcast address */
 893                 h->control = PPP_UI;                 /* Unnumbered Info */
 894         }
 895
 896         switch (dst->sa_family) {
 897 #ifdef INET
 898         case AF_INET:   /* Internet Protocol */
 899                 if (sp->pp_mode == IFF_CISCO)
 900                         h->protocol = htons (ETHERTYPE_IP);
 901                 else {
 902                         /*
 903                          * Don't choke with an ENETDOWN early.  It's
 904                          * possible that we just started dialing out,
 905                          * so don't drop the packet immediately.  If
 906                          * we notice that we run out of buffer space
 907                          * below, we will however remember that we are
 908                          * not ready to carry IP packets, and return
 909                          * ENETDOWN, as opposed to ENOBUFS.
 910                          */
 911                         h->protocol = htons(ipproto);
 912                         if (sp->state[IDX_IPCP] != STATE_OPENED)
 913                                 rv = ENETDOWN;
 914                 }
 915                 break;
 916 #endif
 917 #ifdef INET6
 918         case AF_INET6:   /* Internet Protocol */
 919                 if (sp->pp_mode == IFF_CISCO)
 920                         h->protocol = htons (ETHERTYPE_IPV6);
 921                 else {
 922                         /*
 923                          * Don't choke with an ENETDOWN early.  It's
 924                          * possible that we just started dialing out,
 925                          * so don't drop the packet immediately.  If
 926                          * we notice that we run out of buffer space
 927                          * below, we will however remember that we are
 928                          * not ready to carry IP packets, and return
 929                          * ENETDOWN, as opposed to ENOBUFS.
 930                          */
 931                         h->protocol = htons(PPP_IPV6);
 932                         if (sp->state[IDX_IPV6CP] != STATE_OPENED)
 933                                 rv = ENETDOWN;
 934                 }
 935                 break;
 936 #endif
 937 #ifdef NS
 938         case AF_NS:     /* Xerox NS Protocol */
 939                 h->protocol = htons (sp->pp_mode == IFF_CISCO ?
 940                         ETHERTYPE_NS : PPP_XNS);
 941                 break;
 942 #endif
 943 #ifdef IPX
 944         case AF_IPX:     /* Novell IPX Protocol */
 945                 h->protocol = htons (sp->pp_mode == IFF_CISCO ?
 946                         ETHERTYPE_IPX : PPP_IPX);
 947                 break;
 948 #endif
 949         default:
 950                 m_freem (m);
 951                 ++ifp->if_oerrors;
 952                 crit_exit();
 953                 return (EAFNOSUPPORT);
 954         }
 955
 956         /*
 957          * Queue message on interface, and start output if interface
 958          * not yet active.
 959          */
 960         if (ifq != NULL) {
 961                 if (IF_QFULL(ifq)) {
 962                         IF_DROP(ifq);
 963                         m_freem(m);
 964                         rv = ENOBUFS;
 965                         ifq->ifq_drops++;
 966                 } else {
 967                         IF_ENQUEUE(ifq, m);
 968                         rv = 0;
 969                 }
 970         } else {
 971                 lwkt_serialize_enter(ifp->if_serializer);
 972                 rv = ifq_enqueue(&ifp->if_snd, m, &pktattr);
 973                 lwkt_serialize_exit(ifp->if_serializer);
 974         }
 975         if (rv) {
 976                 ++ifp->if_oerrors;
 977                 crit_exit();
 978                 return(rv);
 979         }
 980         if (! (ifp->if_flags & IFF_OACTIVE))
 981                 (*ifp->if_start) (ifp);
 982
 983         /*
 984          * Count output packets and bytes.
 985          * The packet length includes header, FCS and 1 flag,
 986          * according to RFC 1333.
 987          */
 988         ifp->if_obytes += m->m_pkthdr.len + 3;
 989
 990         /*
 991          * Unlike in sppp_input(), we can always bump the timestamp
 992          * here since sppp_output() is only called on behalf of
 993          * network-layer traffic; control-layer traffic is handled
 994          * by sppp_cp_send().
 995          */
 996         sp->pp_last_sent = time_second;
 997
 998         crit_exit();
 999         return (0);
1000 }
1001
1002 void
1003 sppp_attach(struct ifnet *ifp)
1004 {
1005         struct sppp *sp = (struct sppp*) ifp;
1006
1007         /* Initialize keepalive handler. */
1008         if (!spppq) {
1009                 callout_reset(&keepalive_timeout, hz * 10,
1010                                 sppp_keepalive, NULL);
1011         }
1012         /* Insert new entry into the keepalive list. */
1013         sp->pp_next = spppq;
1014         spppq = sp;
1015
1016         sp->pp_if.if_mtu = PP_MTU;
1017         sp->pp_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
1018         sp->pp_if.if_type = IFT_PPP;
1019         sp->pp_if.if_output = sppp_output;
1020 #if 0
1021         sp->pp_flags = PP_KEEPALIVE;
1022 #endif
1023         sp->pp_if.if_snd.ifq_maxlen = 32;
1024         sp->pp_fastq.ifq_maxlen = 32;
1025         sp->pp_cpq.ifq_maxlen = 20;
1026         sp->pp_loopcnt = 0;
1027         sp->pp_alivecnt = 0;
1028         bzero(&sp->pp_seq[0], sizeof(sp->pp_seq));
1029         bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq));
1030         sp->pp_phase = PHASE_DEAD;
1031         sp->pp_up = lcp.Up;
1032         sp->pp_down = lcp.Down;
1033         sp->pp_last_recv = sp->pp_last_sent = time_second;
1034         sp->confflags = 0;
1035 #ifdef INET
1036         sp->confflags |= CONF_ENABLE_VJ;
1037 #endif
1038 #ifdef INET6
1039         sp->confflags |= CONF_ENABLE_IPV6;
1040 #endif
1041         sp->pp_comp = kmalloc(sizeof(struct slcompress), M_TEMP, M_WAITOK);
1042         sl_compress_init(sp->pp_comp, -1);
1043         sppp_lcp_init(sp);
1044         sppp_ipcp_init(sp);
1045         sppp_ipv6cp_init(sp);
1046         sppp_pap_init(sp);
1047         sppp_chap_init(sp);
1048 }
1049
1050 void
1051 sppp_detach(struct ifnet *ifp)
1052 {
1053         struct sppp **q, *p, *sp = (struct sppp*) ifp;
1054         int i;
1055
1056         /* Remove the entry from the keepalive list. */
1057         for (q = &spppq; (p = *q); q = &p->pp_next)
1058                 if (p == sp) {
1059                         *q = p->pp_next;
1060                         break;
1061                 }
1062
1063         /* Stop keepalive handler. */
1064         if (!spppq)
1065                 callout_stop(&keepalive_timeout);
1066
1067         for (i = 0; i < IDX_COUNT; i++)
1068                 callout_stop(&sp->timeout[i]);
1069         callout_stop(&sp->pap_my_to);
1070 }
1071
1072 /*
1073  * Flush the interface output queue.
1074  */
1075 void
1076 sppp_flush(struct ifnet *ifp)
1077 {
1078         struct sppp *sp = (struct sppp*) ifp;
1079
1080         ifq_purge(&sp->pp_if.if_snd);
1081         IF_DRAIN(&sp->pp_fastq);
1082         IF_DRAIN(&sp->pp_cpq);
1083 }
1084
1085 /*
1086  * Check if the output queue is empty.
1087  */
1088 int
1089 sppp_isempty(struct ifnet *ifp)
1090 {
1091         struct sppp *sp = (struct sppp*) ifp;
1092         int empty;
1093
1094         crit_enter();
1095         empty = IF_QEMPTY(&sp->pp_fastq) && IF_QEMPTY(&sp->pp_cpq) &&
1096                 ifq_is_empty(&sp->pp_if.if_snd);
1097         crit_exit();
1098         return (empty);
1099 }
1100
1101 /*
1102  * Get next packet to send.
1103  */
1104 struct mbuf *
1105 sppp_dequeue(struct ifnet *ifp)
1106 {
1107         struct sppp *sp = (struct sppp*) ifp;
1108         struct mbuf *m;
1109
1110         crit_enter();
1111
1112         /*
1113          * Process only the control protocol queue until we have at
1114          * least one NCP open.
1115          *
1116          * Do always serve all three queues in Cisco mode.
1117          */
1118         IF_DEQUEUE(&sp->pp_cpq, m);
1119         if (m == NULL &&
1120             (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO)) {
1121                 IF_DEQUEUE(&sp->pp_fastq, m);
1122                 if (m == NULL)
1123                         m = ifq_dequeue(&sp->pp_if.if_snd, NULL);
1124         }
1125
1126         crit_exit();
1127         return m;
1128 }
1129
1130 /*
1131  * Pick the next packet, do not remove it from the queue.
1132  */
1133 struct mbuf *
1134 sppp_pick(struct ifnet *ifp)
1135 {
1136         struct sppp *sp = (struct sppp*)ifp;
1137         struct mbuf *m;
1138
1139         crit_enter();
1140
1141         m = sp->pp_cpq.ifq_head;
1142         if (m == NULL &&
1143             (sp->pp_phase == PHASE_NETWORK || sp->pp_mode == IFF_CISCO)) {
1144                 if ((m = sp->pp_fastq.ifq_head) == NULL)
1145                         m = ifq_poll(&sp->pp_if.if_snd);
1146         }
1147
1148         crit_exit();
1149         return (m);
1150 }
1151
1152 /*
1153  * Process an ioctl request.  Called on low priority level.
1154  */
1155 int
1156 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
1157 {
1158         struct ifreq *ifr = (struct ifreq*) data;
1159         struct sppp *sp = (struct sppp*) ifp;
1160         int rv, going_up, going_down, newmode;
1161
1162         crit_enter();
1163
1164         rv = 0;
1165         switch (cmd) {
1166         case SIOCAIFADDR:
1167         case SIOCSIFDSTADDR:
1168                 break;
1169
1170         case SIOCSIFADDR:
1171                 /* set the interface "up" when assigning an IP address */
1172                 ifp->if_flags |= IFF_UP;
1173                 /* fall through... */
1174
1175         case SIOCSIFFLAGS:
1176                 going_up = ifp->if_flags & IFF_UP &&
1177                         (ifp->if_flags & IFF_RUNNING) == 0;
1178                 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1179                         ifp->if_flags & IFF_RUNNING;
1180
1181                 newmode = ifp->if_flags & IFF_PASSIVE;
1182                 if (!newmode)
1183                         newmode = ifp->if_flags & IFF_AUTO;
1184                 if (!newmode)
1185                         newmode = ifp->if_flags & IFF_CISCO;
1186                 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
1187                 ifp->if_flags |= newmode;
1188
1189                 if (newmode != sp->pp_mode) {
1190                         going_down = 1;
1191                         if (!going_up)
1192                                 going_up = ifp->if_flags & IFF_RUNNING;
1193                 }
1194
1195                 if (going_down) {
1196                         if (sp->pp_mode != IFF_CISCO)
1197                                 lcp.Close(sp);
1198                         else if (sp->pp_tlf)
1199                                 (sp->pp_tlf)(sp);
1200                         sppp_flush(ifp);
1201                         ifp->if_flags &= ~IFF_RUNNING;
1202                         sp->pp_mode = newmode;
1203                 }
1204
1205                 if (going_up) {
1206                         if (sp->pp_mode != IFF_CISCO)
1207                                 lcp.Close(sp);
1208                         sp->pp_mode = newmode;
1209                         if (sp->pp_mode == 0) {
1210                                 ifp->if_flags |= IFF_RUNNING;
1211                                 lcp.Open(sp);
1212                         }
1213                         if (sp->pp_mode == IFF_CISCO) {
1214                                 if (sp->pp_tls)
1215                                         (sp->pp_tls)(sp);
1216                                 ifp->if_flags |= IFF_RUNNING;
1217                         }
1218                 }
1219
1220                 break;
1221
1222 #ifdef SIOCSIFMTU
1223 #ifndef ifr_mtu
1224 #define ifr_mtu ifr_metric
1225 #endif
1226         case SIOCSIFMTU:
1227                 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
1228                         return (EINVAL);
1229                 ifp->if_mtu = ifr->ifr_mtu;
1230                 break;
1231 #endif
1232 #ifdef SLIOCSETMTU
1233         case SLIOCSETMTU:
1234                 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
1235                         return (EINVAL);
1236                 ifp->if_mtu = *(short*)data;
1237                 break;
1238 #endif
1239 #ifdef SIOCGIFMTU
1240         case SIOCGIFMTU:
1241                 ifr->ifr_mtu = ifp->if_mtu;
1242                 break;
1243 #endif
1244 #ifdef SLIOCGETMTU
1245         case SLIOCGETMTU:
1246                 *(short*)data = ifp->if_mtu;
1247                 break;
1248 #endif
1249         case SIOCADDMULTI:
1250         case SIOCDELMULTI:
1251                 break;
1252
1253         case SIOCGIFGENERIC:
1254         case SIOCSIFGENERIC:
1255                 rv = sppp_params(sp, cmd, data);
1256                 break;
1257
1258         default:
1259                 rv = ENOTTY;
1260         }
1261
1262         crit_exit();
1263         return rv;
1264 }
1265
1266 /*
1267  * Cisco framing implementation.
1268  */
1269
1270 /*
1271  * Handle incoming Cisco keepalive protocol packets.
1272  */
1273 static void
1274 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1275 {
1276         STDDCL;
1277         struct cisco_packet *h;
1278         u_long me, mymask;
1279
1280         if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1281                 if (debug)
1282                         log(LOG_DEBUG,
1283                             SPP_FMT "cisco invalid packet length: %d bytes\n",
1284                             SPP_ARGS(ifp), m->m_pkthdr.len);
1285                 return;
1286         }
1287         h = mtod (m, struct cisco_packet*);
1288         if (debug)
1289                 log(LOG_DEBUG,
1290                     SPP_FMT "cisco input: %d bytes "
1291                     "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1292                     SPP_ARGS(ifp), m->m_pkthdr.len,
1293                     (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
1294                     (u_int)h->time0, (u_int)h->time1);
1295         switch (ntohl (h->type)) {
1296         default:
1297                 if (debug)
1298                         addlog(SPP_FMT "cisco unknown packet type: 0x%lx\n",
1299                                SPP_ARGS(ifp), (u_long)ntohl (h->type));
1300                 break;
1301         case CISCO_ADDR_REPLY:
1302                 /* Reply on address request, ignore */
1303                 break;
1304         case CISCO_KEEPALIVE_REQ:
1305                 sp->pp_alivecnt = 0;
1306                 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
1307                 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1308                         /* Local and remote sequence numbers are equal.
1309                          * Probably, the line is in loopback mode. */
1310                         if (sp->pp_loopcnt >= MAXALIVECNT) {
1311                                 printf (SPP_FMT "loopback\n",
1312                                         SPP_ARGS(ifp));
1313                                 sp->pp_loopcnt = 0;
1314                                 if (ifp->if_flags & IFF_UP) {
1315                                         if_down (ifp);
1316                                         IF_DRAIN(&sp->pp_cpq);
1317                                 }
1318                         }
1319                         ++sp->pp_loopcnt;
1320
1321                         /* Generate new local sequence number */
1322 #if defined(__DragonFly__)
1323                         sp->pp_seq[IDX_LCP] = krandom();
1324 #else
1325                         sp->pp_seq[IDX_LCP] ^= time.tv_sec ^ time.tv_usec;
1326 #endif
1327                         break;
1328                 }
1329                 sp->pp_loopcnt = 0;
1330                 if (! (ifp->if_flags & IFF_UP) &&
1331                     (ifp->if_flags & IFF_RUNNING)) {
1332                         if_up(ifp);
1333                         printf (SPP_FMT "up\n", SPP_ARGS(ifp));
1334                 }
1335                 break;
1336         case CISCO_ADDR_REQ:
1337                 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1338                 if (me != 0L)
1339                         sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1340                 break;
1341         }
1342 }
1343
1344 /*
1345  * Send Cisco keepalive packet.
1346  */
1347 static void
1348 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1349 {
1350         STDDCL;
1351         struct ppp_header *h;
1352         struct cisco_packet *ch;
1353         struct mbuf *m;
1354 #if defined(__DragonFly__)
1355         struct timeval tv;
1356 #else
1357         u_long t = (time.tv_sec - boottime.tv_sec) * 1000;
1358 #endif
1359
1360 #if defined(__DragonFly__)
1361         getmicrouptime(&tv);
1362 #endif
1363
1364         MGETHDR (m, MB_DONTWAIT, MT_DATA);
1365         if (! m)
1366                 return;
1367         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1368         m->m_pkthdr.rcvif = 0;
1369
1370         h = mtod (m, struct ppp_header*);
1371         h->address = CISCO_MULTICAST;
1372         h->control = 0;
1373         h->protocol = htons (CISCO_KEEPALIVE);
1374
1375         ch = (struct cisco_packet*) (h + 1);
1376         ch->type = htonl (type);
1377         ch->par1 = htonl (par1);
1378         ch->par2 = htonl (par2);
1379         ch->rel = -1;
1380
1381 #if defined(__DragonFly__)
1382         ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1383         ch->time1 = htons ((u_short) tv.tv_sec);
1384 #else
1385         ch->time0 = htons ((u_short) (t >> 16));
1386         ch->time1 = htons ((u_short) t);
1387 #endif
1388
1389         if (debug)
1390                 log(LOG_DEBUG,
1391                     SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1392                         SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
1393                         (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1394
1395         if (IF_QFULL (&sp->pp_cpq)) {
1396                 IF_DROP (&sp->pp_fastq);
1397                 IF_DROP (&ifp->if_snd);
1398                 m_freem (m);
1399         } else
1400                 IF_ENQUEUE (&sp->pp_cpq, m);
1401         if (! (ifp->if_flags & IFF_OACTIVE))
1402                 (*ifp->if_start) (ifp);
1403         ifp->if_obytes += m->m_pkthdr.len + 3;
1404 }
1405
1406 /*
1407  * PPP protocol implementation.
1408  */
1409
1410 /*
1411  * Send PPP control protocol packet.
1412  */
1413 static void
1414 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1415              u_char ident, u_short len, void *data)
1416 {
1417         STDDCL;
1418         struct ppp_header *h;
1419         struct lcp_header *lh;
1420         struct mbuf *m;
1421
1422         if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1423                 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1424         MGETHDR (m, MB_DONTWAIT, MT_DATA);
1425         if (! m)
1426                 return;
1427         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1428         m->m_pkthdr.rcvif = 0;
1429
1430         h = mtod (m, struct ppp_header*);
1431         h->address = PPP_ALLSTATIONS;        /* broadcast address */
1432         h->control = PPP_UI;                 /* Unnumbered Info */
1433         h->protocol = htons (proto);         /* Link Control Protocol */
1434
1435         lh = (struct lcp_header*) (h + 1);
1436         lh->type = type;
1437         lh->ident = ident;
1438         lh->len = htons (LCP_HEADER_LEN + len);
1439         if (len)
1440                 bcopy (data, lh+1, len);
1441
1442         if (debug) {
1443                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1444                     SPP_ARGS(ifp),
1445                     sppp_proto_name(proto),
1446                     sppp_cp_type_name (lh->type), lh->ident,
1447                     ntohs (lh->len));
1448                 sppp_print_bytes ((u_char*) (lh+1), len);
1449                 addlog(">\n");
1450         }
1451         if (IF_QFULL (&sp->pp_cpq)) {
1452                 IF_DROP (&sp->pp_fastq);
1453                 IF_DROP (&ifp->if_snd);
1454                 m_freem (m);
1455                 ++ifp->if_oerrors;
1456         } else
1457                 IF_ENQUEUE (&sp->pp_cpq, m);
1458         if (! (ifp->if_flags & IFF_OACTIVE))
1459                 (*ifp->if_start) (ifp);
1460         ifp->if_obytes += m->m_pkthdr.len + 3;
1461 }
1462
1463 /*
1464  * Handle incoming PPP control protocol packets.
1465  */
1466 static void
1467 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1468 {
1469         STDDCL;
1470         struct lcp_header *h;
1471         int printlen, len = m->m_pkthdr.len;
1472         int rv;
1473         u_char *p;
1474
1475         if (len < 4) {
1476                 if (debug)
1477                         log(LOG_DEBUG,
1478                             SPP_FMT "%s invalid packet length: %d bytes\n",
1479                             SPP_ARGS(ifp), cp->name, len);
1480                 return;
1481         }
1482         h = mtod (m, struct lcp_header*);
1483         if (debug) {
1484                 printlen = ntohs(h->len);
1485                 log(LOG_DEBUG,
1486                     SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1487                     SPP_ARGS(ifp), cp->name,
1488                     sppp_state_name(sp->state[cp->protoidx]),
1489                     sppp_cp_type_name (h->type), h->ident, printlen);
1490                 if (len < printlen)
1491                         printlen = len;
1492                 if (printlen > 4)
1493                         sppp_print_bytes ((u_char*) (h+1), printlen - 4);
1494                 addlog(">\n");
1495         }
1496         if (len > ntohs (h->len))
1497                 len = ntohs (h->len);
1498         p = (u_char *)(h + 1);
1499         switch (h->type) {
1500         case CONF_REQ:
1501                 if (len < 4) {
1502                         if (debug)
1503                                 addlog(SPP_FMT "%s invalid conf-req length %d\n",
1504                                        SPP_ARGS(ifp), cp->name,
1505                                        len);
1506                         ++ifp->if_ierrors;
1507                         break;
1508                 }
1509                 /* handle states where RCR doesn't get a SCA/SCN */
1510                 switch (sp->state[cp->protoidx]) {
1511                 case STATE_CLOSING:
1512                 case STATE_STOPPING:
1513                         return;
1514                 case STATE_CLOSED:
1515                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1516                                      0, 0);
1517                         return;
1518                 }
1519                 rv = (cp->RCR)(sp, h, len);
1520                 if (rv < 0) {
1521                         /* fatal error, shut down */
1522                         (cp->tld)(sp);
1523                         sppp_lcp_tlf(sp);
1524                         return;
1525                 }
1526                 switch (sp->state[cp->protoidx]) {
1527                 case STATE_OPENED:
1528                         (cp->tld)(sp);
1529                         (cp->scr)(sp);
1530                         /* fall through... */
1531                 case STATE_ACK_SENT:
1532                 case STATE_REQ_SENT:
1533                         /*
1534                          * sppp_cp_change_state() have the side effect of
1535                          * restarting the timeouts. We want to avoid that
1536                          * if the state don't change, otherwise we won't
1537                          * ever timeout and resend a configuration request
1538                          * that got lost.
1539                          */
1540                         if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
1541                             STATE_REQ_SENT))
1542                                 break;
1543                         sppp_cp_change_state(cp, sp, rv?
1544                                              STATE_ACK_SENT: STATE_REQ_SENT);
1545                         break;
1546                 case STATE_STOPPED:
1547                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1548                         (cp->scr)(sp);
1549                         sppp_cp_change_state(cp, sp, rv?
1550                                              STATE_ACK_SENT: STATE_REQ_SENT);
1551                         break;
1552                 case STATE_ACK_RCVD:
1553                         if (rv) {
1554                                 sppp_cp_change_state(cp, sp, STATE_OPENED);
1555                                 if (debug)
1556                                         log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1557                                             SPP_ARGS(ifp),
1558                                             cp->name);
1559                                 (cp->tlu)(sp);
1560                         } else
1561                                 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1562                         break;
1563                 default:
1564                         printf(SPP_FMT "%s illegal %s in state %s\n",
1565                                SPP_ARGS(ifp), cp->name,
1566                                sppp_cp_type_name(h->type),
1567                                sppp_state_name(sp->state[cp->protoidx]));
1568                         ++ifp->if_ierrors;
1569                 }
1570                 break;
1571         case CONF_ACK:
1572                 if (h->ident != sp->confid[cp->protoidx]) {
1573                         if (debug)
1574                                 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1575                                        SPP_ARGS(ifp), cp->name,
1576                                        h->ident, sp->confid[cp->protoidx]);
1577                         ++ifp->if_ierrors;
1578                         break;
1579                 }
1580                 switch (sp->state[cp->protoidx]) {
1581                 case STATE_CLOSED:
1582                 case STATE_STOPPED:
1583                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1584                         break;
1585                 case STATE_CLOSING:
1586                 case STATE_STOPPING:
1587                         break;
1588                 case STATE_REQ_SENT:
1589                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1590                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1591                         break;
1592                 case STATE_OPENED:
1593                         (cp->tld)(sp);
1594                         /* fall through */
1595                 case STATE_ACK_RCVD:
1596                         (cp->scr)(sp);
1597                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1598                         break;
1599                 case STATE_ACK_SENT:
1600                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1601                         sppp_cp_change_state(cp, sp, STATE_OPENED);
1602                         if (debug)
1603                                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1604                                        SPP_ARGS(ifp), cp->name);
1605                         (cp->tlu)(sp);
1606                         break;
1607                 default:
1608                         printf(SPP_FMT "%s illegal %s in state %s\n",
1609                                SPP_ARGS(ifp), cp->name,
1610                                sppp_cp_type_name(h->type),
1611                                sppp_state_name(sp->state[cp->protoidx]));
1612                         ++ifp->if_ierrors;
1613                 }
1614                 break;
1615         case CONF_NAK:
1616         case CONF_REJ:
1617                 if (h->ident != sp->confid[cp->protoidx]) {
1618                         if (debug)
1619                                 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1620                                        SPP_ARGS(ifp), cp->name,
1621                                        h->ident, sp->confid[cp->protoidx]);
1622                         ++ifp->if_ierrors;
1623                         break;
1624                 }
1625                 if (h->type == CONF_NAK)
1626                         (cp->RCN_nak)(sp, h, len);
1627                 else /* CONF_REJ */
1628                         (cp->RCN_rej)(sp, h, len);
1629
1630                 switch (sp->state[cp->protoidx]) {
1631                 case STATE_CLOSED:
1632                 case STATE_STOPPED:
1633                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1634                         break;
1635                 case STATE_REQ_SENT:
1636                 case STATE_ACK_SENT:
1637                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1638                         /*
1639                          * Slow things down a bit if we think we might be
1640                          * in loopback. Depend on the timeout to send the
1641                          * next configuration request.
1642                          */
1643                         if (sp->pp_loopcnt)
1644                                 break;
1645                         (cp->scr)(sp);
1646                         break;
1647                 case STATE_OPENED:
1648                         (cp->tld)(sp);
1649                         /* fall through */
1650                 case STATE_ACK_RCVD:
1651                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1652                         (cp->scr)(sp);
1653                         break;
1654                 case STATE_CLOSING:
1655                 case STATE_STOPPING:
1656                         break;
1657                 default:
1658                         printf(SPP_FMT "%s illegal %s in state %s\n",
1659                                SPP_ARGS(ifp), cp->name,
1660                                sppp_cp_type_name(h->type),
1661                                sppp_state_name(sp->state[cp->protoidx]));
1662                         ++ifp->if_ierrors;
1663                 }
1664                 break;
1665
1666         case TERM_REQ:
1667                 switch (sp->state[cp->protoidx]) {
1668                 case STATE_ACK_RCVD:
1669                 case STATE_ACK_SENT:
1670                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1671                         /* fall through */
1672                 case STATE_CLOSED:
1673                 case STATE_STOPPED:
1674                 case STATE_CLOSING:
1675                 case STATE_STOPPING:
1676                 case STATE_REQ_SENT:
1677                   sta:
1678                         /* Send Terminate-Ack packet. */
1679                         if (debug)
1680                                 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1681                                     SPP_ARGS(ifp), cp->name);
1682                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1683                         break;
1684                 case STATE_OPENED:
1685                         (cp->tld)(sp);
1686                         sp->rst_counter[cp->protoidx] = 0;
1687                         sppp_cp_change_state(cp, sp, STATE_STOPPING);
1688                         goto sta;
1689                         break;
1690                 default:
1691                         printf(SPP_FMT "%s illegal %s in state %s\n",
1692                                SPP_ARGS(ifp), cp->name,
1693                                sppp_cp_type_name(h->type),
1694                                sppp_state_name(sp->state[cp->protoidx]));
1695                         ++ifp->if_ierrors;
1696                 }
1697                 break;
1698         case TERM_ACK:
1699                 switch (sp->state[cp->protoidx]) {
1700                 case STATE_CLOSED:
1701                 case STATE_STOPPED:
1702                 case STATE_REQ_SENT:
1703                 case STATE_ACK_SENT:
1704                         break;
1705                 case STATE_CLOSING:
1706                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
1707                         (cp->tlf)(sp);
1708                         break;
1709                 case STATE_STOPPING:
1710                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
1711                         (cp->tlf)(sp);
1712                         break;
1713                 case STATE_ACK_RCVD:
1714                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1715                         break;
1716                 case STATE_OPENED:
1717                         (cp->tld)(sp);
1718                         (cp->scr)(sp);
1719                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1720                         break;
1721                 default:
1722                         printf(SPP_FMT "%s illegal %s in state %s\n",
1723                                SPP_ARGS(ifp), cp->name,
1724                                sppp_cp_type_name(h->type),
1725                                sppp_state_name(sp->state[cp->protoidx]));
1726                         ++ifp->if_ierrors;
1727                 }
1728                 break;
1729         case CODE_REJ:
1730                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1731                 log(LOG_INFO,
1732                     SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1733                     "danger will robinson\n",
1734                     SPP_ARGS(ifp), cp->name,
1735                     sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1736                 switch (sp->state[cp->protoidx]) {
1737                 case STATE_CLOSED:
1738                 case STATE_STOPPED:
1739                 case STATE_REQ_SENT:
1740                 case STATE_ACK_SENT:
1741                 case STATE_CLOSING:
1742                 case STATE_STOPPING:
1743                 case STATE_OPENED:
1744                         break;
1745                 case STATE_ACK_RCVD:
1746                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1747                         break;
1748                 default:
1749                         printf(SPP_FMT "%s illegal %s in state %s\n",
1750                                SPP_ARGS(ifp), cp->name,
1751                                sppp_cp_type_name(h->type),
1752                                sppp_state_name(sp->state[cp->protoidx]));
1753                         ++ifp->if_ierrors;
1754                 }
1755                 break;
1756         case PROTO_REJ:
1757             {
1758                 int catastrophic;
1759                 const struct cp *upper;
1760                 int i;
1761                 u_int16_t proto;
1762
1763                 catastrophic = 0;
1764                 upper = NULL;
1765                 proto = ntohs(*((u_int16_t *)p));
1766                 for (i = 0; i < IDX_COUNT; i++) {
1767                         if (cps[i]->proto == proto) {
1768                                 upper = cps[i];
1769                                 break;
1770                         }
1771                 }
1772                 if (upper == NULL)
1773                         catastrophic++;
1774
1775                 if (catastrophic || debug)
1776                         log(catastrophic? LOG_INFO: LOG_DEBUG,
1777                             SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1778                             SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
1779                             sppp_cp_type_name(h->type), proto,
1780                             upper ? upper->name : "unknown",
1781                             upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1782
1783                 /*
1784                  * if we got RXJ+ against conf-req, the peer does not implement
1785                  * this particular protocol type.  terminate the protocol.
1786                  */
1787                 if (upper && !catastrophic) {
1788                         if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1789                                 upper->Close(sp);
1790                                 break;
1791                         }
1792                 }
1793
1794                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1795                 switch (sp->state[cp->protoidx]) {
1796                 case STATE_CLOSED:
1797                 case STATE_STOPPED:
1798                 case STATE_REQ_SENT:
1799                 case STATE_ACK_SENT:
1800                 case STATE_CLOSING:
1801                 case STATE_STOPPING:
1802                 case STATE_OPENED:
1803                         break;
1804                 case STATE_ACK_RCVD:
1805                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1806                         break;
1807                 default:
1808                         printf(SPP_FMT "%s illegal %s in state %s\n",
1809                                SPP_ARGS(ifp), cp->name,
1810                                sppp_cp_type_name(h->type),
1811                                sppp_state_name(sp->state[cp->protoidx]));
1812                         ++ifp->if_ierrors;
1813                 }
1814                 break;
1815             }
1816         case DISC_REQ:
1817                 if (cp->proto != PPP_LCP)
1818                         goto illegal;
1819                 /* Discard the packet. */
1820                 break;
1821         case ECHO_REQ:
1822                 if (cp->proto != PPP_LCP)
1823                         goto illegal;
1824                 if (sp->state[cp->protoidx] != STATE_OPENED) {
1825                         if (debug)
1826                                 addlog(SPP_FMT "lcp echo req but lcp closed\n",
1827                                        SPP_ARGS(ifp));
1828                         ++ifp->if_ierrors;
1829                         break;
1830                 }
1831                 if (len < 8) {
1832                         if (debug)
1833                                 addlog(SPP_FMT "invalid lcp echo request "
1834                                        "packet length: %d bytes\n",
1835                                        SPP_ARGS(ifp), len);
1836                         break;
1837                 }
1838                 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
1839                     ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1840                         /* Line loopback mode detected. */
1841                         printf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1842                         sp->pp_loopcnt = MAXALIVECNT * 5;
1843                         if_down (ifp);
1844                         IF_DRAIN(&sp->pp_cpq);
1845
1846                         /* Shut down the PPP link. */
1847                         /* XXX */
1848                         lcp.Down(sp);
1849                         lcp.Up(sp);
1850                         break;
1851                 }
1852                 *(long*)(h+1) = htonl (sp->lcp.magic);
1853                 if (debug)
1854                         addlog(SPP_FMT "got lcp echo req, sending echo rep\n",
1855                                SPP_ARGS(ifp));
1856                 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1857                 break;
1858         case ECHO_REPLY:
1859                 if (cp->proto != PPP_LCP)
1860                         goto illegal;
1861                 if (h->ident != sp->lcp.echoid) {
1862                         ++ifp->if_ierrors;
1863                         break;
1864                 }
1865                 if (len < 8) {
1866                         if (debug)
1867                                 addlog(SPP_FMT "lcp invalid echo reply "
1868                                        "packet length: %d bytes\n",
1869                                        SPP_ARGS(ifp), len);
1870                         break;
1871                 }
1872                 if (debug)
1873                         addlog(SPP_FMT "lcp got echo rep\n",
1874                                SPP_ARGS(ifp));
1875                 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
1876                     ntohl (*(long*)(h+1)) != sp->lcp.magic)
1877                         sp->pp_alivecnt = 0;
1878                 break;
1879         default:
1880                 /* Unknown packet type -- send Code-Reject packet. */
1881           illegal:
1882                 if (debug)
1883                         addlog(SPP_FMT "%s send code-rej for 0x%x\n",
1884                                SPP_ARGS(ifp), cp->name, h->type);
1885                 sppp_cp_send(sp, cp->proto, CODE_REJ,
1886                              ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1887                 ++ifp->if_ierrors;
1888         }
1889 }
1890
1891
1892 /*
1893  * The generic part of all Up/Down/Open/Close/TO event handlers.
1894  * Basically, the state transition handling in the automaton.
1895  */
1896 static void
1897 sppp_up_event(const struct cp *cp, struct sppp *sp)
1898 {
1899         STDDCL;
1900
1901         if (debug)
1902                 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
1903                     SPP_ARGS(ifp), cp->name,
1904                     sppp_state_name(sp->state[cp->protoidx]));
1905
1906         switch (sp->state[cp->protoidx]) {
1907         case STATE_INITIAL:
1908                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1909                 break;
1910         case STATE_STARTING:
1911                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1912                 (cp->scr)(sp);
1913                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1914                 break;
1915         default:
1916                 printf(SPP_FMT "%s illegal up in state %s\n",
1917                        SPP_ARGS(ifp), cp->name,
1918                        sppp_state_name(sp->state[cp->protoidx]));
1919         }
1920 }
1921
1922 static void
1923 sppp_down_event(const struct cp *cp, struct sppp *sp)
1924 {
1925         STDDCL;
1926
1927         if (debug)
1928                 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
1929                     SPP_ARGS(ifp), cp->name,
1930                     sppp_state_name(sp->state[cp->protoidx]));
1931
1932         switch (sp->state[cp->protoidx]) {
1933         case STATE_CLOSED:
1934         case STATE_CLOSING:
1935                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1936                 break;
1937         case STATE_STOPPED:
1938                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1939                 (cp->tls)(sp);
1940                 break;
1941         case STATE_STOPPING:
1942         case STATE_REQ_SENT:
1943         case STATE_ACK_RCVD:
1944         case STATE_ACK_SENT:
1945                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1946                 break;
1947         case STATE_OPENED:
1948                 (cp->tld)(sp);
1949                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1950                 break;
1951         default:
1952                 printf(SPP_FMT "%s illegal down in state %s\n",
1953                        SPP_ARGS(ifp), cp->name,
1954                        sppp_state_name(sp->state[cp->protoidx]));
1955         }
1956 }
1957
1958
1959 static void
1960 sppp_open_event(const struct cp *cp, struct sppp *sp)
1961 {
1962         STDDCL;
1963
1964         if (debug)
1965                 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1966                     SPP_ARGS(ifp), cp->name,
1967                     sppp_state_name(sp->state[cp->protoidx]));
1968
1969         switch (sp->state[cp->protoidx]) {
1970         case STATE_INITIAL:
1971                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1972                 (cp->tls)(sp);
1973                 break;
1974         case STATE_STARTING:
1975                 break;
1976         case STATE_CLOSED:
1977                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1978                 (cp->scr)(sp);
1979                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1980                 break;
1981         case STATE_STOPPED:
1982                 /*
1983                  * Try escaping stopped state.  This seems to bite
1984                  * people occasionally, in particular for IPCP,
1985                  * presumably following previous IPCP negotiation
1986                  * aborts.  Somehow, we must have missed a Down event
1987                  * which would have caused a transition into starting
1988                  * state, so as a bandaid we force the Down event now.
1989                  * This effectively implements (something like the)
1990                  * `restart' option mentioned in the state transition
1991                  * table of RFC 1661.
1992                  */
1993                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1994                 (cp->tls)(sp);
1995                 break;
1996         case STATE_STOPPING:
1997         case STATE_REQ_SENT:
1998         case STATE_ACK_RCVD:
1999         case STATE_ACK_SENT:
2000         case STATE_OPENED:
2001                 break;
2002         case STATE_CLOSING:
2003                 sppp_cp_change_state(cp, sp, STATE_STOPPING);
2004                 break;
2005         }
2006 }
2007
2008
2009 static void
2010 sppp_close_event(const struct cp *cp, struct sppp *sp)
2011 {
2012         STDDCL;
2013
2014         if (debug)
2015                 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
2016                     SPP_ARGS(ifp), cp->name,
2017                     sppp_state_name(sp->state[cp->protoidx]));
2018
2019         switch (sp->state[cp->protoidx]) {
2020         case STATE_INITIAL:
2021         case STATE_CLOSED:
2022         case STATE_CLOSING:
2023                 break;
2024         case STATE_STARTING:
2025                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
2026                 (cp->tlf)(sp);
2027                 break;
2028         case STATE_STOPPED:
2029                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2030                 break;
2031         case STATE_STOPPING:
2032                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2033                 break;
2034         case STATE_OPENED:
2035                 (cp->tld)(sp);
2036                 /* fall through */
2037         case STATE_REQ_SENT:
2038         case STATE_ACK_RCVD:
2039         case STATE_ACK_SENT:
2040                 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
2041                 sppp_cp_send(sp, cp->proto, TERM_REQ,
2042                              ++sp->pp_seq[cp->protoidx], 0, 0);
2043                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2044                 break;
2045         }
2046 }
2047
2048 static void
2049 sppp_to_event(const struct cp *cp, struct sppp *sp)
2050 {
2051         STDDCL;
2052
2053         crit_enter();
2054
2055         if (debug)
2056                 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
2057                     SPP_ARGS(ifp), cp->name,
2058                     sppp_state_name(sp->state[cp->protoidx]),
2059                     sp->rst_counter[cp->protoidx]);
2060
2061         if (--sp->rst_counter[cp->protoidx] < 0)
2062                 /* TO- event */
2063                 switch (sp->state[cp->protoidx]) {
2064                 case STATE_CLOSING:
2065                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
2066                         (cp->tlf)(sp);
2067                         break;
2068                 case STATE_STOPPING:
2069                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2070                         (cp->tlf)(sp);
2071                         break;
2072                 case STATE_REQ_SENT:
2073                 case STATE_ACK_RCVD:
2074                 case STATE_ACK_SENT:
2075                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2076                         (cp->tlf)(sp);
2077                         break;
2078                 }
2079         else
2080                 /* TO+ event */
2081                 switch (sp->state[cp->protoidx]) {
2082                 case STATE_CLOSING:
2083                 case STATE_STOPPING:
2084                         sppp_cp_send(sp, cp->proto, TERM_REQ,
2085                                      ++sp->pp_seq[cp->protoidx], 0, 0);
2086                         callout_reset(&sp->timeout[cp->protoidx],
2087                                         sp->lcp.timeout, cp->TO, sp);
2088                         break;
2089                 case STATE_REQ_SENT:
2090                 case STATE_ACK_RCVD:
2091                         (cp->scr)(sp);
2092                         /* sppp_cp_change_state() will restart the timer */
2093                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
2094                         break;
2095                 case STATE_ACK_SENT:
2096                         (cp->scr)(sp);
2097                         callout_reset(&sp->timeout[cp->protoidx],
2098                                         sp->lcp.timeout, cp->TO, sp);
2099                         break;
2100                 }
2101
2102         crit_exit();
2103 }
2104
2105 /*
2106  * Change the state of a control protocol in the state automaton.
2107  * Takes care of starting/stopping the restart timer.
2108  */
2109 void
2110 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
2111 {
2112         sp->state[cp->protoidx] = newstate;
2113         callout_stop(&sp->timeout[cp->protoidx]);
2114
2115         switch (newstate) {
2116         case STATE_INITIAL:
2117         case STATE_STARTING:
2118         case STATE_CLOSED:
2119         case STATE_STOPPED:
2120         case STATE_OPENED:
2121                 break;
2122         case STATE_CLOSING:
2123         case STATE_STOPPING:
2124         case STATE_REQ_SENT:
2125         case STATE_ACK_RCVD:
2126         case STATE_ACK_SENT:
2127                 callout_reset(&sp->timeout[cp->protoidx],
2128                                 sp->lcp.timeout, cp->TO, sp);
2129                 break;
2130         }
2131 }
2132
2133 /*
2134  *--------------------------------------------------------------------------*
2135  *                                                                          *
2136  *                         The LCP implementation.                          *
2137  *                                                                          *
2138  *--------------------------------------------------------------------------*
2139  */
2140 static void
2141 sppp_lcp_init(struct sppp *sp)
2142 {
2143         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2144         sp->lcp.magic = 0;
2145         sp->state[IDX_LCP] = STATE_INITIAL;
2146         sp->fail_counter[IDX_LCP] = 0;
2147         sp->pp_seq[IDX_LCP] = 0;
2148         sp->pp_rseq[IDX_LCP] = 0;
2149         sp->lcp.protos = 0;
2150         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2151
2152         /* Note that these values are  relevant for all control protocols */
2153         sp->lcp.timeout = 3 * hz;
2154         sp->lcp.max_terminate = 2;
2155         sp->lcp.max_configure = 10;
2156         sp->lcp.max_failure = 10;
2157 #if defined(__DragonFly__)
2158         callout_init(&sp->timeout[IDX_LCP]);
2159 #endif
2160 }
2161
2162 static void
2163 sppp_lcp_up(struct sppp *sp)
2164 {
2165         STDDCL;
2166
2167         sp->pp_alivecnt = 0;
2168         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2169         sp->lcp.magic = 0;
2170         sp->lcp.protos = 0;
2171         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2172         /*
2173          * If this interface is passive or dial-on-demand, and we are
2174          * still in Initial state, it means we've got an incoming
2175          * call.  Activate the interface.
2176          */
2177         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2178                 if (debug)
2179                         log(LOG_DEBUG,
2180                             SPP_FMT "Up event", SPP_ARGS(ifp));
2181                 ifp->if_flags |= IFF_RUNNING;
2182                 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2183                         if (debug)
2184                                 addlog("(incoming call)\n");
2185                         sp->pp_flags |= PP_CALLIN;
2186                         lcp.Open(sp);
2187                 } else if (debug)
2188                         addlog("\n");
2189         } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2190                    (sp->state[IDX_LCP] == STATE_INITIAL)) {
2191                 ifp->if_flags |= IFF_RUNNING;
2192                 lcp.Open(sp);
2193         }
2194
2195         sppp_up_event(&lcp, sp);
2196 }
2197
2198 static void
2199 sppp_lcp_down(struct sppp *sp)
2200 {
2201         STDDCL;
2202
2203         sppp_down_event(&lcp, sp);
2204
2205         /*
2206          * If this is neither a dial-on-demand nor a passive
2207          * interface, simulate an ``ifconfig down'' action, so the
2208          * administrator can force a redial by another ``ifconfig
2209          * up''.  XXX For leased line operation, should we immediately
2210          * try to reopen the connection here?
2211          */
2212         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2213                 log(LOG_INFO,
2214                     SPP_FMT "Down event, taking interface down.\n",
2215                     SPP_ARGS(ifp));
2216                 if_down(ifp);
2217         } else {
2218                 if (debug)
2219                         log(LOG_DEBUG,
2220                             SPP_FMT "Down event (carrier loss)\n",
2221                             SPP_ARGS(ifp));
2222                 sp->pp_flags &= ~PP_CALLIN;
2223                 if (sp->state[IDX_LCP] != STATE_INITIAL)
2224                         lcp.Close(sp);
2225                 ifp->if_flags &= ~IFF_RUNNING;
2226         }
2227 }
2228
2229 static void
2230 sppp_lcp_open(struct sppp *sp)
2231 {
2232         /*
2233          * If we are authenticator, negotiate LCP_AUTH
2234          */
2235         if (sp->hisauth.proto != 0)
2236                 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2237         else
2238                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2239         sp->pp_flags &= ~PP_NEEDAUTH;
2240         sppp_open_event(&lcp, sp);
2241 }
2242
2243 static void
2244 sppp_lcp_close(struct sppp *sp)
2245 {
2246         sppp_close_event(&lcp, sp);
2247 }
2248
2249 static void
2250 sppp_lcp_TO(void *cookie)
2251 {
2252         sppp_to_event(&lcp, (struct sppp *)cookie);
2253 }
2254
2255 /*
2256  * Analyze a configure request.  Return true if it was agreeable, and
2257  * caused action sca, false if it has been rejected or nak'ed, and
2258  * caused action scn.  (The return value is used to make the state
2259  * transition decision in the state automaton.)
2260  */
2261 static int
2262 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2263 {
2264         STDDCL;
2265         u_char *buf, *r, *p;
2266         int origlen, rlen;
2267         u_long nmagic;
2268         u_short authproto;
2269
2270         len -= 4;
2271         origlen = len;
2272         buf = r = kmalloc (len, M_TEMP, M_INTWAIT);
2273
2274         if (debug)
2275                 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
2276                     SPP_ARGS(ifp));
2277
2278         /* pass 1: check for things that need to be rejected */
2279         p = (void*) (h+1);
2280         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2281                 /* Sanity check option length */
2282                 if (p[1] > len) {
2283                         /* Malicious option - drop immediately.
2284                          * XXX Maybe we should just RXJ it?
2285                          */
2286                          addlog("%s: received malicious LCP option 0x%02x, "
2287                              "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname,
2288                              p[0], p[1], len);
2289                         goto drop;
2290                 }
2291                 if (debug)
2292                         addlog(" %s ", sppp_lcp_opt_name(*p));
2293                 switch (*p) {
2294                 case LCP_OPT_MAGIC:
2295                         /* Magic number. */
2296                         if (len >= 6 && p[1] == 6)
2297                                 continue;
2298                         if (debug)
2299                                 addlog("[invalid] ");
2300                         break;
2301                 case LCP_OPT_ASYNC_MAP:
2302                         /* Async control character map. */
2303                         if (len >= 6 && p[1] == 6)
2304                                 continue;
2305                         if (debug)
2306                                 addlog("[invalid] ");
2307                         break;
2308                 case LCP_OPT_MRU:
2309                         /* Maximum receive unit. */
2310                         if (len >= 4 && p[1] == 4)
2311                                 continue;
2312                         if (debug)
2313                                 addlog("[invalid] ");
2314                         break;
2315                 case LCP_OPT_AUTH_PROTO:
2316                         if (len < 4) {
2317                                 if (debug)
2318                                         addlog("[invalid] ");
2319                                 break;
2320                         }
2321                         authproto = (p[2] << 8) + p[3];
2322                         if (authproto == PPP_CHAP && p[1] != 5) {
2323                                 if (debug)
2324                                         addlog("[invalid chap len] ");
2325                                 break;
2326                         }
2327                         if (sp->myauth.proto == 0) {
2328                                 /* we are not configured to do auth */
2329                                 if (debug)
2330                                         addlog("[not configured] ");
2331                                 break;
2332                         }
2333                         /*
2334                          * Remote want us to authenticate, remember this,
2335                          * so we stay in PHASE_AUTHENTICATE after LCP got
2336                          * up.
2337                          */
2338                         sp->pp_flags |= PP_NEEDAUTH;
2339                         continue;
2340                 default:
2341                         /* Others not supported. */
2342                         if (debug)
2343                                 addlog("[rej] ");
2344                         break;
2345                 }
2346                 /* Add the option to rejected list. */
2347                 bcopy (p, r, p[1]);
2348                 r += p[1];
2349                 rlen += p[1];
2350         }
2351         if (rlen) {
2352                 if (debug)
2353                         addlog(" send conf-rej\n");
2354                 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2355                 return 0;
2356         } else if (debug)
2357                 addlog("\n");
2358
2359         /*
2360          * pass 2: check for option values that are unacceptable and
2361          * thus require to be nak'ed.
2362          */
2363         if (debug)
2364                 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2365                     SPP_ARGS(ifp));
2366
2367         p = (void*) (h+1);
2368         len = origlen;
2369         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2370                 if (debug)
2371                         addlog(" %s ", sppp_lcp_opt_name(*p));
2372                 switch (*p) {
2373                 case LCP_OPT_MAGIC:
2374                         /* Magic number -- extract. */
2375                         nmagic = (u_long)p[2] << 24 |
2376                                 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2377                         if (nmagic != sp->lcp.magic) {
2378                                 sp->pp_loopcnt = 0;
2379                                 if (debug)
2380                                         addlog("0x%lx ", nmagic);
2381                                 continue;
2382                         }
2383                         if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
2384                                 addlog("[glitch] ");
2385                         ++sp->pp_loopcnt;
2386                         /*
2387                          * We negate our magic here, and NAK it.  If
2388                          * we see it later in an NAK packet, we
2389                          * suggest a new one.
2390                          */
2391                         nmagic = ~sp->lcp.magic;
2392                         /* Gonna NAK it. */
2393                         p[2] = nmagic >> 24;
2394                         p[3] = nmagic >> 16;
2395                         p[4] = nmagic >> 8;
2396                         p[5] = nmagic;
2397                         break;
2398
2399                 case LCP_OPT_ASYNC_MAP:
2400                         /*
2401                          * Async control character map -- just ignore it.
2402                          *
2403                          * Quote from RFC 1662, chapter 6:
2404                          * To enable this functionality, synchronous PPP
2405                          * implementations MUST always respond to the
2406                          * Async-Control-Character-Map Configuration
2407                          * Option with the LCP Configure-Ack.  However,
2408                          * acceptance of the Configuration Option does
2409                          * not imply that the synchronous implementation
2410                          * will do any ACCM mapping.  Instead, all such
2411                          * octet mapping will be performed by the
2412                          * asynchronous-to-synchronous converter.
2413                          */
2414                         continue;
2415
2416                 case LCP_OPT_MRU:
2417                         /*
2418                          * Maximum receive unit.  Always agreeable,
2419                          * but ignored by now.
2420                          */
2421                         sp->lcp.their_mru = p[2] * 256 + p[3];
2422                         if (debug)
2423                                 addlog("%lu ", sp->lcp.their_mru);
2424                         continue;
2425
2426                 case LCP_OPT_AUTH_PROTO:
2427                         authproto = (p[2] << 8) + p[3];
2428                         if (sp->myauth.proto != authproto) {
2429                                 /* not agreed, nak */
2430                                 if (debug)
2431                                         addlog("[mine %s != his %s] ",
2432                                                sppp_proto_name(sp->hisauth.proto),
2433                                                sppp_proto_name(authproto));
2434                                 p[2] = sp->myauth.proto >> 8;
2435                                 p[3] = sp->myauth.proto;
2436                                 break;
2437                         }
2438                         if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2439                                 if (debug)
2440                                         addlog("[chap not MD5] ");
2441                                 p[4] = CHAP_MD5;
2442                                 break;
2443                         }
2444                         continue;
2445                 }
2446                 /* Add the option to nak'ed list. */
2447                 bcopy (p, r, p[1]);
2448                 r += p[1];
2449                 rlen += p[1];
2450         }
2451         if (rlen) {
2452                 /*
2453                  * Local and remote magics equal -- loopback?
2454                  */
2455                 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2456                         if (sp->pp_loopcnt == MAXALIVECNT*5)
2457                                 printf (SPP_FMT "loopback\n",
2458                                         SPP_ARGS(ifp));
2459                         if (ifp->if_flags & IFF_UP) {
2460                                 if_down(ifp);
2461                                 IF_DRAIN(&sp->pp_cpq);
2462                                 /* XXX ? */
2463                                 lcp.Down(sp);
2464                                 lcp.Up(sp);
2465                         }
2466                 } else if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2467                         if (debug)
2468                                 addlog(" max_failure (%d) exceeded, "
2469                                        "send conf-rej\n",
2470                                        sp->lcp.max_failure);
2471                         sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2472                 } else {
2473                         if (debug)
2474                                 addlog(" send conf-nak\n");
2475                         sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2476                 }
2477         } else {
2478                 if (debug)
2479                         addlog(" send conf-ack\n");
2480                 sp->fail_counter[IDX_LCP] = 0;
2481                 sp->pp_loopcnt = 0;
2482                 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2483                               h->ident, origlen, h+1);
2484         }
2485
2486         kfree (buf, M_TEMP);
2487         return (rlen == 0);
2488
2489 drop:
2490         kfree(buf, M_TEMP);
2491         return (-1);
2492 }
2493
2494 /*
2495  * Analyze the LCP Configure-Reject option list, and adjust our
2496  * negotiation.
2497  */
2498 static void
2499 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2500 {
2501         STDDCL;
2502         u_char *buf, *p;
2503
2504         len -= 4;
2505         buf = kmalloc (len, M_TEMP, M_INTWAIT);
2506
2507         if (debug)
2508                 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2509                     SPP_ARGS(ifp));
2510
2511         p = (void*) (h+1);
2512         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2513                 /* Sanity check option length */
2514                 if (p[1] > len) {
2515                         /*
2516                          * Malicious option - drop immediately.
2517                          * XXX Maybe we should just RXJ it?
2518                          */
2519                         addlog("%s: received malicious LCP option, "
2520                             "dropping.\n", ifp->if_xname);
2521                         goto drop;
2522                 }
2523                 if (debug)
2524                         addlog(" %s ", sppp_lcp_opt_name(*p));
2525                 switch (*p) {
2526                 case LCP_OPT_MAGIC:
2527                         /* Magic number -- can't use it, use 0 */
2528                         sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2529                         sp->lcp.magic = 0;
2530                         break;
2531                 case LCP_OPT_MRU:
2532                         /*
2533                          * Should not be rejected anyway, since we only
2534                          * negotiate a MRU if explicitly requested by
2535                          * peer.
2536                          */
2537                         sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2538                         break;
2539                 case LCP_OPT_AUTH_PROTO:
2540                         /*
2541                          * Peer doesn't want to authenticate himself,
2542                          * deny unless this is a dialout call, and
2543                          * AUTHFLAG_NOCALLOUT is set.
2544                          */
2545                         if ((sp->pp_flags & PP_CALLIN) == 0 &&
2546                             (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2547                                 if (debug)
2548                                         addlog("[don't insist on auth "
2549                                                "for callout]");
2550                                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2551                                 break;
2552                         }
2553                         if (debug)
2554                                 addlog("[access denied]\n");
2555                         lcp.Close(sp);
2556                         break;
2557                 }
2558         }
2559         if (debug)
2560                 addlog("\n");
2561 drop:
2562         kfree (buf, M_TEMP);
2563         return;
2564 }
2565
2566 /*
2567  * Analyze the LCP Configure-NAK option list, and adjust our
2568  * negotiation.
2569  */
2570 static void
2571 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2572 {
2573         STDDCL;
2574         u_char *buf, *p;
2575         u_long magic;
2576
2577         len -= 4;
2578         buf = kmalloc (len, M_TEMP, M_INTWAIT);
2579
2580         if (debug)
2581                 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2582                     SPP_ARGS(ifp));
2583
2584         p = (void*) (h+1);
2585         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2586                 /* Sanity check option length */
2587                 if (p[1] > len) {
2588                         /*
2589                          * Malicious option - drop immediately.
2590                          * XXX Maybe we should just RXJ it?
2591                          */
2592                         addlog("%s: received malicious LCP option, "
2593                             "dropping.\n", ifp->if_xname);
2594                         goto drop;
2595                 }
2596                 if (debug)
2597                         addlog(" %s ", sppp_lcp_opt_name(*p));
2598                 switch (*p) {
2599                 case LCP_OPT_MAGIC:
2600                         /* Magic number -- renegotiate */
2601                         if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2602                             len >= 6 && p[1] == 6) {
2603                                 magic = (u_long)p[2] << 24 |
2604                                         (u_long)p[3] << 16 | p[4] << 8 | p[5];
2605                                 /*
2606                                  * If the remote magic is our negated one,
2607                                  * this looks like a loopback problem.
2608                                  * Suggest a new magic to make sure.
2609                                  */
2610                                 if (magic == ~sp->lcp.magic) {
2611                                         if (debug)
2612                                                 addlog("magic glitch ");
2613 #if defined(__DragonFly__)
2614                                         sp->lcp.magic = krandom();
2615 #else
2616                                         sp->lcp.magic = time.tv_sec + time.tv_usec;
2617 #endif
2618                                 } else {
2619                                         sp->lcp.magic = magic;
2620                                         if (debug)
2621                                                 addlog("%lu ", magic);
2622                                 }
2623                         }
2624                         break;
2625                 case LCP_OPT_MRU:
2626                         /*
2627                          * Peer wants to advise us to negotiate an MRU.
2628                          * Agree on it if it's reasonable, or use
2629                          * default otherwise.
2630                          */
2631                         if (len >= 4 && p[1] == 4) {
2632                                 u_int mru = p[2] * 256 + p[3];
2633                                 if (debug)
2634                                         addlog("%d ", mru);
2635                                 if (mru < PP_MTU || mru > PP_MAX_MRU)
2636                                         mru = PP_MTU;
2637                                 sp->lcp.mru = mru;
2638                                 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2639                         }
2640                         break;
2641                 case LCP_OPT_AUTH_PROTO:
2642                         /*
2643                          * Peer doesn't like our authentication method,
2644                          * deny.
2645                          */
2646                         if (debug)
2647                                 addlog("[access denied]\n");
2648                         lcp.Close(sp);
2649                         break;
2650                 }
2651         }
2652         if (debug)
2653                 addlog("\n");
2654 drop:
2655         kfree (buf, M_TEMP);
2656         return;
2657 }
2658
2659 static void
2660 sppp_lcp_tlu(struct sppp *sp)
2661 {
2662         STDDCL;
2663         int i;
2664         u_long mask;
2665
2666         /* XXX ? */
2667         if (! (ifp->if_flags & IFF_UP) &&
2668             (ifp->if_flags & IFF_RUNNING)) {
2669                 /* Coming out of loopback mode. */
2670                 if_up(ifp);
2671                 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
2672         }
2673
2674         for (i = 0; i < IDX_COUNT; i++)
2675                 if ((cps[i])->flags & CP_QUAL)
2676                         (cps[i])->Open(sp);
2677
2678         if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2679             (sp->pp_flags & PP_NEEDAUTH) != 0)
2680                 sp->pp_phase = PHASE_AUTHENTICATE;
2681         else
2682                 sp->pp_phase = PHASE_NETWORK;
2683
2684         if (debug)
2685                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2686                     sppp_phase_name(sp->pp_phase));
2687
2688         /*
2689          * Open all authentication protocols.  This is even required
2690          * if we already proceeded to network phase, since it might be
2691          * that remote wants us to authenticate, so we might have to
2692          * send a PAP request.  Undesired authentication protocols
2693          * don't do anything when they get an Open event.
2694          */
2695         for (i = 0; i < IDX_COUNT; i++)
2696                 if ((cps[i])->flags & CP_AUTH)
2697                         (cps[i])->Open(sp);
2698
2699         if (sp->pp_phase == PHASE_NETWORK) {
2700                 /* Notify all NCPs. */
2701                 for (i = 0; i < IDX_COUNT; i++)
2702                         if (((cps[i])->flags & CP_NCP) &&
2703                             /*
2704                              * XXX
2705                              * Hack to administratively disable IPv6 if
2706                              * not desired.  Perhaps we should have another
2707                              * flag for this, but right now, we can make
2708                              * all struct cp's read/only.
2709                              */
2710                             (cps[i] != &ipv6cp ||
2711                              (sp->confflags & CONF_ENABLE_IPV6)))
2712                                 (cps[i])->Open(sp);
2713         }
2714
2715         /* Send Up events to all started protos. */
2716         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2717                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2718                         (cps[i])->Up(sp);
2719
2720         /* notify low-level driver of state change */
2721         if (sp->pp_chg)
2722                 sp->pp_chg(sp, (int)sp->pp_phase);
2723
2724         if (sp->pp_phase == PHASE_NETWORK)
2725                 /* if no NCP is starting, close down */
2726                 sppp_lcp_check_and_close(sp);
2727 }
2728
2729 static void
2730 sppp_lcp_tld(struct sppp *sp)
2731 {
2732         STDDCL;
2733         int i;
2734         u_long mask;
2735
2736         sp->pp_phase = PHASE_TERMINATE;
2737
2738         if (debug)
2739                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2740                     sppp_phase_name(sp->pp_phase));
2741
2742         /*
2743          * Take upper layers down.  We send the Down event first and
2744          * the Close second to prevent the upper layers from sending
2745          * ``a flurry of terminate-request packets'', as the RFC
2746          * describes it.
2747          */
2748         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2749                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2750                         (cps[i])->Down(sp);
2751                         (cps[i])->Close(sp);
2752                 }
2753 }
2754
2755 static void
2756 sppp_lcp_tls(struct sppp *sp)
2757 {
2758         STDDCL;
2759
2760         sp->pp_phase = PHASE_ESTABLISH;
2761
2762         if (debug)
2763                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2764                     sppp_phase_name(sp->pp_phase));
2765
2766         /* Notify lower layer if desired. */
2767         if (sp->pp_tls)
2768                 (sp->pp_tls)(sp);
2769         else
2770                 (sp->pp_up)(sp);
2771 }
2772
2773 static void
2774 sppp_lcp_tlf(struct sppp *sp)
2775 {
2776         STDDCL;
2777
2778         sp->pp_phase = PHASE_DEAD;
2779         if (debug)
2780                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2781                     sppp_phase_name(sp->pp_phase));
2782
2783         /* Notify lower layer if desired. */
2784         if (sp->pp_tlf)
2785                 (sp->pp_tlf)(sp);
2786         else
2787                 (sp->pp_down)(sp);
2788 }
2789
2790 static void
2791 sppp_lcp_scr(struct sppp *sp)
2792 {
2793         char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2794         int i = 0;
2795         u_short authproto;
2796
2797         if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2798                 if (! sp->lcp.magic)
2799 #if defined(__DragonFly__)
2800                         sp->lcp.magic = krandom();
2801 #else
2802                         sp->lcp.magic = time.tv_sec + time.tv_usec;
2803 #endif
2804                 opt[i++] = LCP_OPT_MAGIC;
2805                 opt[i++] = 6;
2806                 opt[i++] = sp->lcp.magic >> 24;
2807                 opt[i++] = sp->lcp.magic >> 16;
2808                 opt[i++] = sp->lcp.magic >> 8;
2809                 opt[i++] = sp->lcp.magic;
2810         }
2811
2812         if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2813                 opt[i++] = LCP_OPT_MRU;
2814                 opt[i++] = 4;
2815                 opt[i++] = sp->lcp.mru >> 8;
2816                 opt[i++] = sp->lcp.mru;
2817         }
2818
2819         if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2820                 authproto = sp->hisauth.proto;
2821                 opt[i++] = LCP_OPT_AUTH_PROTO;
2822                 opt[i++] = authproto == PPP_CHAP? 5: 4;
2823                 opt[i++] = authproto >> 8;
2824                 opt[i++] = authproto;
2825                 if (authproto == PPP_CHAP)
2826                         opt[i++] = CHAP_MD5;
2827         }
2828
2829         sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2830         sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2831 }
2832
2833 /*
2834  * Check the open NCPs, return true if at least one NCP is open.
2835  */
2836 static int
2837 sppp_ncp_check(struct sppp *sp)
2838 {
2839         int i, mask;
2840
2841         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2842                 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2843                         return 1;
2844         return 0;
2845 }
2846
2847 /*
2848  * Re-check the open NCPs and see if we should terminate the link.
2849  * Called by the NCPs during their tlf action handling.
2850  */
2851 static void
2852 sppp_lcp_check_and_close(struct sppp *sp)
2853 {
2854
2855         if (sp->pp_phase < PHASE_NETWORK)
2856                 /* don't bother, we are already going down */
2857                 return;
2858
2859         if (sppp_ncp_check(sp))
2860                 return;
2861
2862         lcp.Close(sp);
2863 }
2864
2865 /*
2866  *--------------------------------------------------------------------------*
2867  *                                                                          *
2868  *                        The IPCP implementation.                          *
2869  *                                                                          *
2870  *--------------------------------------------------------------------------*
2871  */
2872
2873 static void
2874 sppp_ipcp_init(struct sppp *sp)
2875 {
2876         sp->ipcp.opts = 0;
2877         sp->ipcp.flags = 0;
2878         sp->state[IDX_IPCP] = STATE_INITIAL;
2879         sp->fail_counter[IDX_IPCP] = 0;
2880         sp->pp_seq[IDX_IPCP] = 0;
2881         sp->pp_rseq[IDX_IPCP] = 0;
2882 #if defined(__DragonFly__)
2883         callout_init(&sp->timeout[IDX_IPCP]);
2884 #endif
2885 }
2886
2887 static void
2888 sppp_ipcp_up(struct sppp *sp)
2889 {
2890         sppp_up_event(&ipcp, sp);
2891 }
2892
2893 static void
2894 sppp_ipcp_down(struct sppp *sp)
2895 {
2896         sppp_down_event(&ipcp, sp);
2897 }
2898
2899 static void
2900 sppp_ipcp_open(struct sppp *sp)
2901 {
2902         STDDCL;
2903         u_long myaddr, hisaddr;
2904
2905         sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
2906                             IPCP_MYADDR_DYN | IPCP_VJ);
2907         sp->ipcp.opts = 0;
2908
2909         sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2910         /*
2911          * If we don't have his address, this probably means our
2912          * interface doesn't want to talk IP at all.  (This could
2913          * be the case if somebody wants to speak only IPX, for
2914          * example.)  Don't open IPCP in this case.
2915          */
2916         if (hisaddr == 0L) {
2917                 /* XXX this message should go away */
2918                 if (debug)
2919                         log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2920                             SPP_ARGS(ifp));
2921                 return;
2922         }
2923         if (myaddr == 0L) {
2924                 /*
2925                  * I don't have an assigned address, so i need to
2926                  * negotiate my address.
2927                  */
2928                 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2929                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2930         } else
2931                 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2932         if (sp->confflags & CONF_ENABLE_VJ) {
2933                 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
2934                 sp->ipcp.max_state = MAX_STATES - 1;
2935                 sp->ipcp.compress_cid = 1;
2936         }
2937         sppp_open_event(&ipcp, sp);
2938 }
2939
2940 static void
2941 sppp_ipcp_close(struct sppp *sp)
2942 {
2943         sppp_close_event(&ipcp, sp);
2944         if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2945                 /*
2946                  * My address was dynamic, clear it again.
2947                  */
2948                 sppp_set_ip_addr(sp, 0L);
2949 }
2950
2951 static void
2952 sppp_ipcp_TO(void *cookie)
2953 {
2954         sppp_to_event(&ipcp, (struct sppp *)cookie);
2955 }
2956
2957 /*
2958  * Analyze a configure request.  Return true if it was agreeable, and
2959  * caused action sca, false if it has been rejected or nak'ed, and
2960  * caused action scn.  (The return value is used to make the state
2961  * transition decision in the state automaton.)
2962  */
2963 static int
2964 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2965 {
2966         u_char *buf, *r, *p;
2967         struct ifnet *ifp = &sp->pp_if;
2968         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2969         u_long hisaddr, desiredaddr;
2970         int gotmyaddr = 0;
2971         int desiredcomp;
2972
2973         len -= 4;
2974         origlen = len;
2975         /*
2976          * Make sure to allocate a buf that can at least hold a
2977          * conf-nak with an `address' option.  We might need it below.
2978          */
2979         buf = r = kmalloc ((len < 6? 6: len), M_TEMP, M_INTWAIT);
2980
2981         /* pass 1: see if we can recognize them */
2982         if (debug)
2983                 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2984                     SPP_ARGS(ifp));
2985         p = (void*) (h+1);
2986         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2987                 /* Sanity check option length */
2988                 if (p[1] > len) {
2989                         /* XXX should we just RXJ? */
2990                         addlog("%s: malicious IPCP option received, dropping\n",
2991                             ifp->if_xname);
2992                         goto drop;
2993                 }
2994                 if (debug)
2995                         addlog(" %s ", sppp_ipcp_opt_name(*p));
2996                 switch (*p) {
2997                 case IPCP_OPT_COMPRESSION:
2998                         if (!(sp->confflags & CONF_ENABLE_VJ)) {
2999                                 /* VJ compression administratively disabled */
3000                                 if (debug)
3001                                         addlog("[locally disabled] ");
3002                                 break;
3003                         }
3004                         /*
3005                          * In theory, we should only conf-rej an
3006                          * option that is shorter than RFC 1618
3007                          * requires (i.e. < 4), and should conf-nak
3008                          * anything else that is not VJ.  However,
3009                          * since our algorithm always uses the
3010                          * original option to NAK it with new values,
3011                          * things would become more complicated.  In
3012                          * pratice, the only commonly implemented IP
3013                          * compression option is VJ anyway, so the
3014                          * difference is negligible.
3015                          */
3016                         if (len >= 6 && p[1] == 6) {
3017                                 /*
3018                                  * correctly formed compression option
3019                                  * that could be VJ compression
3020                                  */
3021                                 continue;
3022                         }
3023                         if (debug)
3024                                 addlog("optlen %d [invalid/unsupported] ",
3025                                     p[1]);
3026                         break;
3027                 case IPCP_OPT_ADDRESS:
3028                         if (len >= 6 && p[1] == 6) {
3029                                 /* correctly formed address option */
3030                                 continue;
3031                         }
3032                         if (debug)
3033                                 addlog("[invalid] ");
3034                         break;
3035                 default:
3036                         /* Others not supported. */
3037                         if (debug)
3038                                 addlog("[rej] ");
3039                         break;
3040                 }
3041                 /* Add the option to rejected list. */
3042                 bcopy (p, r, p[1]);
3043                 r += p[1];
3044                 rlen += p[1];
3045         }
3046         if (rlen) {
3047                 if (debug)
3048                         addlog(" send conf-rej\n");
3049                 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
3050                 return 0;
3051         } else if (debug)
3052                 addlog("\n");
3053
3054         /* pass 2: parse option values */
3055         sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
3056         if (debug)
3057                 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
3058                        SPP_ARGS(ifp));
3059         p = (void*) (h+1);
3060         len = origlen;
3061         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3062                 if (debug)
3063                         addlog(" %s ", sppp_ipcp_opt_name(*p));
3064                 switch (*p) {
3065                 case IPCP_OPT_COMPRESSION:
3066                         desiredcomp = p[2] << 8 | p[3];
3067                         /* We only support VJ */
3068                         if (desiredcomp == IPCP_COMP_VJ) {
3069                                 if (debug)
3070                                         addlog("VJ [ack] ");
3071                                 sp->ipcp.flags |= IPCP_VJ;
3072                                 sl_compress_init(sp->pp_comp, p[4]);
3073                                 sp->ipcp.max_state = p[4];
3074                                 sp->ipcp.compress_cid = p[5];
3075                                 continue;
3076                         }
3077                         if (debug)
3078                                 addlog("compproto %#04x [not supported] ",
3079                                     desiredcomp);
3080                         p[2] = IPCP_COMP_VJ >> 8;
3081                         p[3] = IPCP_COMP_VJ;
3082                         p[4] = sp->ipcp.max_state;
3083                         p[5] = sp->ipcp.compress_cid;
3084                         break;
3085                 case IPCP_OPT_ADDRESS:
3086                         /* This is the address he wants in his end */
3087                         desiredaddr = p[2] << 24 | p[3] << 16 |
3088                                 p[4] << 8 | p[5];
3089                         if (desiredaddr == hisaddr ||
3090                             (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
3091                                 /*
3092                                  * Peer's address is same as our value,
3093                                  * or we have set it to 0.0.0.* to
3094                                  * indicate that we do not really care,
3095                                  * this is agreeable.  Gonna conf-ack
3096                                  * it.
3097                                  */
3098                                 if (debug)
3099                                         addlog("%s [ack] ",
3100                                                 sppp_dotted_quad(hisaddr));
3101                                 /* record that we've seen it already */
3102                                 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
3103                                 continue;
3104                         }
3105                         /*
3106                          * The address wasn't agreeable.  This is either
3107                          * he sent us 0.0.0.0, asking to assign him an
3108                          * address, or he send us another address not
3109                          * matching our value.  Either case, we gonna
3110                          * conf-nak it with our value.
3111                          * XXX: we should "rej" if hisaddr == 0
3112                          */
3113                         if (debug) {
3114                                 if (desiredaddr == 0)
3115                                         addlog("[addr requested] ");
3116                                 else
3117                                         addlog("%s [not agreed] ",
3118                                                 sppp_dotted_quad(desiredaddr));
3119
3120                         }
3121                         p[2] = hisaddr >> 24;
3122                         p[3] = hisaddr >> 16;
3123                         p[4] = hisaddr >> 8;
3124                         p[5] = hisaddr;
3125                         break;
3126                 }
3127                 /* Add the option to nak'ed list. */
3128                 bcopy (p, r, p[1]);
3129                 r += p[1];
3130                 rlen += p[1];
3131         }
3132
3133         /*
3134          * If we are about to conf-ack the request, but haven't seen
3135          * his address so far, gonna conf-nak it instead, with the
3136          * `address' option present and our idea of his address being
3137          * filled in there, to request negotiation of both addresses.
3138          *
3139          * XXX This can result in an endless req - nak loop if peer
3140          * doesn't want to send us his address.  Q: What should we do
3141          * about it?  XXX  A: implement the max-failure counter.
3142          */
3143         if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
3144                 buf[0] = IPCP_OPT_ADDRESS;
3145                 buf[1] = 6;
3146                 buf[2] = hisaddr >> 24;
3147                 buf[3] = hisaddr >> 16;
3148                 buf[4] = hisaddr >> 8;
3149                 buf[5] = hisaddr;
3150                 rlen = 6;
3151                 if (debug)
3152                         addlog("still need hisaddr ");
3153         }
3154
3155         if (rlen) {
3156                 if (debug)
3157                         addlog(" send conf-nak\n");
3158                 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
3159         } else {
3160                 if (debug)
3161                         addlog(" send conf-ack\n");
3162                 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
3163                               h->ident, origlen, h+1);
3164         }
3165
3166         kfree (buf, M_TEMP);
3167         return (rlen == 0);
3168
3169 drop:
3170         kfree(buf, M_TEMP);
3171         return (-1);
3172 }
3173
3174 /*
3175  * Analyze the IPCP Configure-Reject option list, and adjust our
3176  * negotiation.
3177  */
3178 static void
3179 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3180 {
3181         u_char *buf, *p;
3182         struct ifnet *ifp = &sp->pp_if;
3183         int debug = ifp->if_flags & IFF_DEBUG;
3184
3185         len -= 4;
3186         buf = kmalloc (len, M_TEMP, M_INTWAIT);
3187
3188         if (debug)
3189                 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
3190                     SPP_ARGS(ifp));
3191
3192         p = (void*) (h+1);
3193         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3194                 /* Sanity check option length */
3195                 if (p[1] > len) {
3196                         /* XXX should we just RXJ? */
3197                         addlog("%s: malicious IPCP option received, dropping\n",
3198                             ifp->if_xname);
3199                         goto drop;
3200                 }
3201                 if (debug)
3202                         addlog(" %s ", sppp_ipcp_opt_name(*p));
3203                 switch (*p) {
3204                 case IPCP_OPT_COMPRESSION:
3205                         sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
3206                         break;
3207                 case IPCP_OPT_ADDRESS:
3208                         /*
3209                          * Peer doesn't grok address option.  This is
3210                          * bad.  XXX  Should we better give up here?
3211                          * XXX We could try old "addresses" option...
3212                          */
3213                         sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3214                         break;
3215                 }
3216         }
3217         if (debug)
3218                 addlog("\n");
3219 drop:
3220         kfree (buf, M_TEMP);
3221         return;
3222 }
3223
3224 /*
3225  * Analyze the IPCP Configure-NAK option list, and adjust our
3226  * negotiation.
3227  */
3228 static void
3229 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3230 {
3231         u_char *buf, *p;
3232         struct ifnet *ifp = &sp->pp_if;
3233         int debug = ifp->if_flags & IFF_DEBUG;
3234         int desiredcomp;
3235         u_long wantaddr;
3236
3237         len -= 4;
3238         buf = kmalloc (len, M_TEMP, M_INTWAIT);
3239
3240         if (debug)
3241                 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
3242                     SPP_ARGS(ifp));
3243
3244         p = (void*) (h+1);
3245         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3246                 /* Sanity check option length */
3247                 if (p[1] > len) {
3248                         /* XXX should we just RXJ? */
3249                         addlog("%s: malicious IPCP option received, dropping\n",
3250                             ifp->if_xname);
3251                         return;
3252                 }
3253                 if (debug)
3254                         addlog(" %s ", sppp_ipcp_opt_name(*p));
3255                 switch (*p) {
3256                 case IPCP_OPT_COMPRESSION:
3257                         if (len >= 6 && p[1] == 6) {
3258                                 desiredcomp = p[2] << 8 | p[3];
3259                                 if (debug)
3260                                         addlog("[wantcomp %#04x] ",
3261                                                 desiredcomp);
3262                                 if (desiredcomp == IPCP_COMP_VJ) {
3263                                         sl_compress_init(sp->pp_comp, p[4]);
3264                                         sp->ipcp.max_state = p[4];
3265                                         sp->ipcp.compress_cid = p[5];
3266                                         if (debug)
3267                                                 addlog("[agree] ");
3268                                 } else
3269                                         sp->ipcp.opts &=
3270                                                 ~(1 << IPCP_OPT_COMPRESSION);
3271                         }
3272                         break;
3273                 case IPCP_OPT_ADDRESS:
3274                         /*
3275                          * Peer doesn't like our local IP address.  See
3276                          * if we can do something for him.  We'll drop
3277                          * him our address then.
3278                          */
3279                         if (len >= 6 && p[1] == 6) {
3280                                 wantaddr = p[2] << 24 | p[3] << 16 |
3281                                         p[4] << 8 | p[5];
3282                                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3283                                 if (debug)
3284                                         addlog("[wantaddr %s] ",
3285                                                sppp_dotted_quad(wantaddr));
3286                                 /*
3287                                  * When doing dynamic address assignment,
3288                                  * we accept his offer.  Otherwise, we
3289                                  * ignore it and thus continue to negotiate
3290                                  * our already existing value.
3291                                  * XXX: Bogus, if he said no once, he'll
3292                                  * just say no again, might as well die.
3293                                  */
3294                                 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3295                                         sppp_set_ip_addr(sp, wantaddr);
3296                                         if (debug)
3297                                                 addlog("[agree] ");
3298                                         sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3299                                 }
3300                         }
3301                         break;
3302                 }
3303         }
3304         if (debug)
3305                 addlog("\n");
3306         kfree (buf, M_TEMP);
3307         return;
3308 }
3309
3310 static void
3311 sppp_ipcp_tlu(struct sppp *sp)
3312 {
3313         /* we are up - notify isdn daemon */
3314         if (sp->pp_con)
3315                 sp->pp_con(sp);
3316 }
3317
3318 static void
3319 sppp_ipcp_tld(struct sppp *sp)
3320 {
3321 }
3322
3323 static void
3324 sppp_ipcp_tls(struct sppp *sp)
3325 {
3326         /* indicate to LCP that it must stay alive */
3327         sp->lcp.protos |= (1 << IDX_IPCP);
3328 }
3329
3330 static void
3331 sppp_ipcp_tlf(struct sppp *sp)
3332 {
3333         /* we no longer need LCP */
3334         sp->lcp.protos &= ~(1 << IDX_IPCP);
3335         sppp_lcp_check_and_close(sp);
3336 }
3337
3338 static void
3339 sppp_ipcp_scr(struct sppp *sp)
3340 {
3341         char opt[6 /* compression */ + 6 /* address */];
3342         u_long ouraddr;
3343         int i = 0;
3344
3345         if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3346                 opt[i++] = IPCP_OPT_COMPRESSION;
3347                 opt[i++] = 6;
3348                 opt[i++] = IPCP_COMP_VJ >> 8;
3349                 opt[i++] = IPCP_COMP_VJ;
3350                 opt[i++] = sp->ipcp.max_state;
3351                 opt[i++] = sp->ipcp.compress_cid;
3352         }
3353         if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3354                 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3355                 opt[i++] = IPCP_OPT_ADDRESS;
3356                 opt[i++] = 6;
3357                 opt[i++] = ouraddr >> 24;
3358                 opt[i++] = ouraddr >> 16;
3359                 opt[i++] = ouraddr >> 8;
3360                 opt[i++] = ouraddr;
3361         }
3362
3363         sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3364         sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3365 }
3366
3367 /*
3368  *--------------------------------------------------------------------------*
3369  *                                                                          *
3370  *                      The IPv6CP implementation.                          *
3371  *                                                                          *
3372  *--------------------------------------------------------------------------*
3373  */
3374
3375 #ifdef INET6
3376 static void
3377 sppp_ipv6cp_init(struct sppp *sp)
3378 {
3379         sp->ipv6cp.opts = 0;
3380         sp->ipv6cp.flags = 0;
3381         sp->state[IDX_IPV6CP] = STATE_INITIAL;
3382         sp->fail_counter[IDX_IPV6CP] = 0;
3383         sp->pp_seq[IDX_IPV6CP] = 0;
3384         sp->pp_rseq[IDX_IPV6CP] = 0;
3385 #if defined(__NetBSD__)
3386         callout_init(&sp->ch[IDX_IPV6CP]);
3387 #endif
3388 #if defined(__DragonFly__)
3389         callout_init(&sp->timeout[IDX_IPV6CP]);
3390 #endif
3391 }
3392
3393 static void
3394 sppp_ipv6cp_up(struct sppp *sp)
3395 {
3396         sppp_up_event(&ipv6cp, sp);
3397 }
3398
3399 static void
3400 sppp_ipv6cp_down(struct sppp *sp)
3401 {
3402         sppp_down_event(&ipv6cp, sp);
3403 }
3404
3405 static void
3406 sppp_ipv6cp_open(struct sppp *sp)
3407 {
3408         STDDCL;
3409         struct in6_addr myaddr, hisaddr;
3410
3411 #ifdef IPV6CP_MYIFID_DYN
3412         sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3413 #else
3414         sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3415 #endif
3416
3417         sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3418         /*
3419          * If we don't have our address, this probably means our
3420          * interface doesn't want to talk IPv6 at all.  (This could
3421          * be the case if somebody wants to speak only IPX, for
3422          * example.)  Don't open IPv6CP in this case.
3423          */
3424         if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3425                 /* XXX this message should go away */
3426                 if (debug)
3427                         log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
3428                             SPP_ARGS(ifp));
3429                 return;
3430         }
3431
3432         sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3433         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3434         sppp_open_event(&ipv6cp, sp);
3435 }
3436
3437 static void
3438 sppp_ipv6cp_close(struct sppp *sp)
3439 {
3440         sppp_close_event(&ipv6cp, sp);
3441 }
3442
3443 static void
3444 sppp_ipv6cp_TO(void *cookie)
3445 {
3446         sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3447 }
3448
3449 /*
3450  * Analyze a configure request.  Return true if it was agreeable, and
3451  * caused action sca, false if it has been rejected or nak'ed, and
3452  * caused action scn.  (The return value is used to make the state
3453  * transition decision in the state automaton.)
3454  */
3455 static int
3456 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3457 {
3458         u_char *buf, *r, *p;
3459         struct ifnet *ifp = &sp->pp_if;
3460         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3461         struct in6_addr myaddr, desiredaddr, suggestaddr;
3462         int ifidcount;
3463         int type;
3464         int collision, nohisaddr;
3465
3466         len -= 4;
3467         origlen = len;
3468         /*
3469          * Make sure to allocate a buf that can at least hold a
3470          * conf-nak with an `address' option.  We might need it below.
3471          */
3472         buf = r = kmalloc ((len < 6? 6: len), M_TEMP, M_INTWAIT);
3473
3474         /* pass 1: see if we can recognize them */
3475         if (debug)
3476                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
3477                     SPP_ARGS(ifp));
3478         p = (void*) (h+1);
3479         ifidcount = 0;
3480         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3481                 /* Sanity check option length */
3482                 if (p[1] > len) {
3483                         /* XXX just RXJ? */
3484                         addlog("%s: received malicious IPCPv6 option, "
3485                             "dropping\n", ifp->if_xname);
3486                         goto drop;
3487                 }
3488                 if (debug)
3489                         addlog(" %s", sppp_ipv6cp_opt_name(*p));
3490                 switch (*p) {
3491                 case IPV6CP_OPT_IFID:
3492                         if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3493                                 /* correctly formed address option */
3494                                 ifidcount++;
3495                                 continue;
3496                         }
3497                         if (debug)
3498                                 addlog(" [invalid]");
3499                         break;
3500 #ifdef notyet
3501                 case IPV6CP_OPT_COMPRESSION:
3502                         if (len >= 4 && p[1] >= 4) {
3503                                 /* correctly formed compress option */
3504                                 continue;
3505                         }
3506                         if (debug)
3507                                 addlog(" [invalid]");
3508                         break;
3509 #endif
3510                 default:
3511                         /* Others not supported. */
3512                         if (debug)
3513                                 addlog(" [rej]");
3514                         break;
3515                 }
3516                 /* Add the option to rejected list. */
3517                 bcopy (p, r, p[1]);
3518                 r += p[1];
3519                 rlen += p[1];
3520         }
3521         if (rlen) {
3522                 if (debug)
3523                         addlog(" send conf-rej\n");
3524                 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3525                 goto end;
3526         } else if (debug)
3527                 addlog("\n");
3528
3529         /* pass 2: parse option values */
3530         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3531         if (debug)
3532                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
3533                     SPP_ARGS(ifp));
3534         p = (void*) (h+1);
3535         len = origlen;
3536         type = CONF_ACK;
3537         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3538                 if (debug)
3539                         addlog(" %s", sppp_ipv6cp_opt_name(*p));
3540                 switch (*p) {
3541 #ifdef notyet
3542                 case IPV6CP_OPT_COMPRESSION:
3543                         continue;
3544 #endif
3545                 case IPV6CP_OPT_IFID:
3546                         bzero(&desiredaddr, sizeof(desiredaddr));
3547                         bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3548                         collision = (bcmp(&desiredaddr.s6_addr[8],
3549                                           &myaddr.s6_addr[8], 8) == 0);
3550                         nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3551
3552                         desiredaddr.s6_addr16[0] = htons(0xfe80);
3553                         desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3554
3555                         if (!collision && !nohisaddr) {
3556                                 /* no collision, hisaddr known - Conf-Ack */
3557                                 type = CONF_ACK;
3558
3559                                 if (debug) {
3560                                         addlog(" %s [%s]",
3561                                                ip6_sprintf(&desiredaddr),
3562                                                sppp_cp_type_name(type));
3563                                 }
3564                                 continue;
3565                         }
3566
3567                         bzero(&suggestaddr, sizeof(&suggestaddr));
3568                         if (collision && nohisaddr) {
3569                                 /* collision, hisaddr unknown - Conf-Rej */
3570                                 type = CONF_REJ;
3571                                 bzero(&p[2], 8);
3572                         } else {
3573                                 /*
3574                                  * - no collision, hisaddr unknown, or
3575                                  * - collision, hisaddr known
3576                                  * Conf-Nak, suggest hisaddr
3577                                  */
3578                                 type = CONF_NAK;
3579                                 sppp_suggest_ip6_addr(sp, &suggestaddr);
3580                                 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3581                         }
3582                         if (debug)
3583                                 addlog(" %s [%s]", ip6_sprintf(&desiredaddr),
3584                                        sppp_cp_type_name(type));
3585                         break;
3586                 }
3587                 /* Add the option to nak'ed list. */
3588                 bcopy (p, r, p[1]);
3589                 r += p[1];
3590                 rlen += p[1];
3591         }
3592
3593         if (rlen == 0 && type == CONF_ACK) {
3594                 if (debug)
3595                         addlog(" send %s\n", sppp_cp_type_name(type));
3596                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
3597         } else {
3598 #ifdef DIAGNOSTIC
3599                 if (type == CONF_ACK)
3600                         panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3601 #endif
3602
3603                 if (debug) {
3604                         addlog(" send %s suggest %s\n",
3605                                sppp_cp_type_name(type), ip6_sprintf(&suggestaddr));
3606                 }
3607                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3608         }
3609
3610  end:
3611         kfree (buf, M_TEMP);
3612         return (rlen == 0);
3613
3614 drop:
3615         kfree(buf, M_TEMP);
3616         return (-1);
3617 }
3618
3619 /*
3620  * Analyze the IPv6CP Configure-Reject option list, and adjust our
3621  * negotiation.
3622  */
3623 static void
3624 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3625 {
3626         u_char *buf, *p;
3627         struct ifnet *ifp = &sp->pp_if;
3628         int debug = ifp->if_flags & IFF_DEBUG;
3629
3630         len -= 4;
3631         buf = kmalloc (len, M_TEMP, M_INTWAIT);
3632
3633         if (debug)
3634                 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
3635                     SPP_ARGS(ifp));
3636
3637         p = (void*) (h+1);
3638         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3639                 if (p[1] > len) {
3640                         /* XXX just RXJ? */
3641                         addlog("%s: received malicious IPCPv6 option, "
3642                             "dropping\n", ifp->if_xname);
3643                         goto drop;
3644                 }
3645                 if (debug)
3646                         addlog(" %s", sppp_ipv6cp_opt_name(*p));
3647                 switch (*p) {
3648                 case IPV6CP_OPT_IFID:
3649                         /*
3650                          * Peer doesn't grok address option.  This is
3651                          * bad.  XXX  Should we better give up here?
3652                          */
3653                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3654                         break;
3655 #ifdef notyet
3656                 case IPV6CP_OPT_COMPRESS:
3657                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3658                         break;
3659 #endif
3660                 }
3661         }
3662         if (debug)
3663                 addlog("\n");
3664 drop:
3665         kfree (buf, M_TEMP);
3666         return;
3667 }
3668
3669 /*
3670  * Analyze the IPv6CP Configure-NAK option list, and adjust our
3671  * negotiation.
3672  */
3673 static void
3674 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3675 {
3676         u_char *buf, *p;
3677         struct ifnet *ifp = &sp->pp_if;
3678         int debug = ifp->if_flags & IFF_DEBUG;
3679         struct in6_addr suggestaddr;
3680
3681         len -= 4;
3682         buf = kmalloc (len, M_TEMP, M_INTWAIT);
3683
3684         if (debug)
3685                 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:",
3686                     SPP_ARGS(ifp));
3687
3688         p = (void*) (h+1);
3689         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3690                 if (p[1] > len) {
3691                         /* XXX just RXJ? */
3692                         addlog("%s: received malicious IPCPv6 option, "
3693                             "dropping\n", ifp->if_xname);
3694                         goto drop;
3695                 }
3696                 if (debug)
3697                         addlog(" %s", sppp_ipv6cp_opt_name(*p));
3698                 switch (*p) {
3699                 case IPV6CP_OPT_IFID:
3700                         /*
3701                          * Peer doesn't like our local ifid.  See
3702                          * if we can do something for him.  We'll drop
3703                          * him our address then.
3704                          */
3705                         if (len < 10 || p[1] != 10)
3706                                 break;
3707                         bzero(&suggestaddr, sizeof(suggestaddr));
3708                         suggestaddr.s6_addr16[0] = htons(0xfe80);
3709                         suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3710                         bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3711
3712                         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3713                         if (debug)
3714                                 addlog(" [suggestaddr %s]",
3715                                        ip6_sprintf(&suggestaddr));
3716 #ifdef IPV6CP_MYIFID_DYN
3717                         /*
3718                          * When doing dynamic address assignment,
3719                          * we accept his offer.
3720                          */
3721                         if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3722                                 struct in6_addr lastsuggest;
3723                                 /*
3724                                  * If <suggested myaddr from peer> equals to
3725                                  * <hisaddr we have suggested last time>,
3726                                  * we have a collision.  generate new random
3727                                  * ifid.
3728                                  */
3729                                 sppp_suggest_ip6_addr(&lastsuggest);
3730                                 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
3731                                                        lastsuggest)) {
3732                                         if (debug)
3733                                                 addlog(" [random]");
3734                                         sppp_gen_ip6_addr(sp, &suggestaddr);
3735                                 }
3736                                 sppp_set_ip6_addr(sp, &suggestaddr, 0);
3737                                 if (debug)
3738                                         addlog(" [agree]");
3739                                 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3740                         }
3741 #else
3742                         /*
3743                          * Since we do not do dynamic address assignment,
3744                          * we ignore it and thus continue to negotiate
3745                          * our already existing value.  This can possibly
3746                          * go into infinite request-reject loop.
3747                          *
3748                          * This is not likely because we normally use
3749                          * ifid based on MAC-address.
3750                          * If you have no ethernet card on the node, too bad.
3751                          * XXX should we use fail_counter?
3752                          */
3753 #endif
3754                         break;
3755 #ifdef notyet
3756                 case IPV6CP_OPT_COMPRESS:
3757                         /*
3758                          * Peer wants different compression parameters.
3759                          */
3760                         break;
3761 #endif
3762                 }
3763         }
3764         if (debug)
3765                 addlog("\n");
3766 drop:
3767         kfree (buf, M_TEMP);
3768         return;
3769 }
3770 static void
3771 sppp_ipv6cp_tlu(struct sppp *sp)
3772 {
3773         /* we are up - notify isdn daemon */
3774         if (sp->pp_con)
3775                 sp->pp_con(sp);
3776 }
3777
3778 static void
3779 sppp_ipv6cp_tld(struct sppp *sp)
3780 {
3781 }
3782
3783 static void
3784 sppp_ipv6cp_tls(struct sppp *sp)
3785 {
3786         /* indicate to LCP that it must stay alive */
3787         sp->lcp.protos |= (1 << IDX_IPV6CP);
3788 }
3789
3790 static void
3791 sppp_ipv6cp_tlf(struct sppp *sp)
3792 {
3793
3794 #if 0   /* need #if 0 to close IPv6CP properly */
3795         /* we no longer need LCP */
3796         sp->lcp.protos &= ~(1 << IDX_IPV6CP);
3797         sppp_lcp_check_and_close(sp);
3798 #endif
3799 }
3800
3801 static void
3802 sppp_ipv6cp_scr(struct sppp *sp)
3803 {
3804         char opt[10 /* ifid */ + 4 /* compression, minimum */];
3805         struct in6_addr ouraddr;
3806         int i = 0;
3807
3808         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
3809                 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
3810                 opt[i++] = IPV6CP_OPT_IFID;
3811                 opt[i++] = 10;
3812                 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
3813                 i += 8;
3814         }
3815
3816 #ifdef notyet
3817         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
3818                 opt[i++] = IPV6CP_OPT_COMPRESSION;
3819                 opt[i++] = 4;
3820                 opt[i++] = 0;   /* TBD */
3821                 opt[i++] = 0;   /* TBD */
3822                 /* variable length data may follow */
3823         }
3824 #endif
3825
3826         sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
3827         sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt);
3828 }
3829 #else /*INET6*/
3830 static void
3831 sppp_ipv6cp_init(struct sppp *sp)
3832 {
3833 }
3834
3835 static void
3836 sppp_ipv6cp_up(struct sppp *sp)
3837 {
3838 }
3839
3840 static void
3841 sppp_ipv6cp_down(struct sppp *sp)
3842 {
3843 }
3844
3845
3846 static void
3847 sppp_ipv6cp_open(struct sppp *sp)
3848 {
3849 }
3850
3851 static void
3852 sppp_ipv6cp_close(struct sppp *sp)
3853 {
3854 }
3855
3856 static void
3857 sppp_ipv6cp_TO(void *sp)
3858 {
3859 }
3860
3861 static int
3862 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3863 {
3864         return 0;
3865 }
3866
3867 static void
3868 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3869 {
3870 }
3871
3872 static void
3873 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3874 {
3875 }
3876
3877 static void
3878 sppp_ipv6cp_tlu(struct sppp *sp)
3879 {
3880 }
3881
3882 static void
3883 sppp_ipv6cp_tld(struct sppp *sp)
3884 {
3885 }
3886
3887 static void
3888 sppp_ipv6cp_tls(struct sppp *sp)
3889 {
3890 }
3891
3892 static void
3893 sppp_ipv6cp_tlf(struct sppp *sp)
3894 {
3895 }
3896
3897 static void
3898 sppp_ipv6cp_scr(struct sppp *sp)
3899 {
3900 }
3901 #endif /*INET6*/
3902
3903 /*
3904  *--------------------------------------------------------------------------*
3905  *                                                                          *
3906  *                        The CHAP implementation.                          *
3907  *                                                                          *
3908  *--------------------------------------------------------------------------*
3909  */
3910
3911 /*
3912  * The authentication protocols don't employ a full-fledged state machine as
3913  * the control protocols do, since they do have Open and Close events, but
3914  * not Up and Down, nor are they explicitly terminated.  Also, use of the
3915  * authentication protocols may be different in both directions (this makes
3916  * sense, think of a machine that never accepts incoming calls but only
3917  * calls out, it doesn't require the called party to authenticate itself).
3918  *
3919  * Our state machine for the local authentication protocol (we are requesting
3920  * the peer to authenticate) looks like:
3921  *
3922  *                                                  RCA-
3923  *            +--------------------------------------------+
3924  *            V                                     scn,tld|
3925  *        +--------+                           Close   +---------+ RCA+
3926  *        |        |<----------------------------------|         |------+
3927  *   +--->| Closed |                            TO*    | Opened  | sca  |
3928  *   |    |        |-----+                     +-------|         |<-----+
3929  *   |    +--------+ irc |                     |       +---------+
3930  *   |      ^            |                     |           ^
3931  *   |      |            |                     |           |
3932  *   |      |            |                     |           |
3933  *   |   TO-|            |                     |           |
3934  *   |      |tld  TO+    V                     |           |
3935  *   |      |   +------->+                     |           |
3936  *   |      |   |        |                     |           |
3937  *   |    +--------+     V                     |           |
3938  *   |    |        |<----+<--------------------+           |
3939  *   |    | Req-   | scr                                   |
3940  *   |    | Sent   |                                       |
3941  *   |    |        |                                       |
3942  *   |    +--------+                                       |
3943  *   | RCA- |   | RCA+                                     |
3944  *   +------+   +------------------------------------------+
3945  *   scn,tld      sca,irc,ict,tlu
3946  *
3947  *
3948  *   with:
3949  *
3950  *      Open:   LCP reached authentication phase
3951  *      Close:  LCP reached terminate phase
3952  *
3953  *      RCA+:   received reply (pap-req, chap-response), acceptable
3954  *      RCN:    received reply (pap-req, chap-response), not acceptable
3955  *      TO+:    timeout with restart counter >= 0
3956  *      TO-:    timeout with restart counter < 0
3957  *      TO*:    reschedule timeout for CHAP
3958  *
3959  *      scr:    send request packet (none for PAP, chap-challenge)
3960  *      sca:    send ack packet (pap-ack, chap-success)
3961  *      scn:    send nak packet (pap-nak, chap-failure)
3962  *      ict:    initialize re-challenge timer (CHAP only)
3963  *
3964  *      tlu:    this-layer-up, LCP reaches network phase
3965  *      tld:    this-layer-down, LCP enters terminate phase
3966  *
3967  * Note that in CHAP mode, after sending a new challenge, while the state
3968  * automaton falls back into Req-Sent state, it doesn't signal a tld
3969  * event to LCP, so LCP remains in network phase.  Only after not getting
3970  * any response (or after getting an unacceptable response), CHAP closes,
3971  * causing LCP to enter terminate phase.
3972  *
3973  * With PAP, there is no initial request that can be sent.  The peer is
3974  * expected to send one based on the successful negotiation of PAP as
3975  * the authentication protocol during the LCP option negotiation.
3976  *
3977  * Incoming authentication protocol requests (remote requests
3978  * authentication, we are peer) don't employ a state machine at all,
3979  * they are simply answered.  Some peers [Ascend P50 firmware rev
3980  * 4.50] react allergically when sending IPCP requests while they are
3981  * still in authentication phase (thereby violating the standard that
3982  * demands that these NCP packets are to be discarded), so we keep
3983  * track of the peer demanding us to authenticate, and only proceed to
3984  * phase network once we've seen a positive acknowledge for the
3985  * authentication.
3986  */
3987
3988 /*
3989  * Handle incoming CHAP packets.
3990  */
3991 void
3992 sppp_chap_input(struct sppp *sp, struct mbuf *m)
3993 {
3994         STDDCL;
3995         struct lcp_header *h;
3996         int len;
3997         u_char *value, *name, digest[AUTHKEYLEN], dsize;
3998         int value_len, name_len;
3999         MD5_CTX ctx;
4000
4001         len = m->m_pkthdr.len;
4002         if (len < 4) {
4003                 if (debug)
4004                         log(LOG_DEBUG,
4005                             SPP_FMT "chap invalid packet length: %d bytes\n",
4006                             SPP_ARGS(ifp), len);
4007                 return;
4008         }
4009         h = mtod (m, struct lcp_header*);
4010         if (len > ntohs (h->len))
4011                 len = ntohs (h->len);
4012
4013         switch (h->type) {
4014         /* challenge, failure and success are his authproto */
4015         case CHAP_CHALLENGE:
4016                 value = 1 + (u_char*)(h+1);
4017                 value_len = value[-1];
4018                 name = value + value_len;
4019                 name_len = len - value_len - 5;
4020                 if (name_len < 0) {
4021                         if (debug) {
4022                                 log(LOG_DEBUG,
4023                                     SPP_FMT "chap corrupted challenge "
4024                                     "<%s id=0x%x len=%d",
4025                                     SPP_ARGS(ifp),
4026                                     sppp_auth_type_name(PPP_CHAP, h->type),
4027                                     h->ident, ntohs(h->len));
4028                                 sppp_print_bytes((u_char*) (h+1), len-4);
4029                                 addlog(">\n");
4030                         }
4031                         break;
4032                 }
4033
4034                 if (debug) {
4035                         log(LOG_DEBUG,
4036                             SPP_FMT "chap input <%s id=0x%x len=%d name=",
4037                             SPP_ARGS(ifp),
4038                             sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
4039                             ntohs(h->len));
4040                         sppp_print_string((char*) name, name_len);
4041                         addlog(" value-size=%d value=", value_len);
4042                         sppp_print_bytes(value, value_len);
4043                         addlog(">\n");
4044                 }
4045
4046                 /* Compute reply value. */
4047                 MD5Init(&ctx);
4048                 MD5Update(&ctx, &h->ident, 1);
4049                 MD5Update(&ctx, sp->myauth.secret,
4050                           sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
4051                 MD5Update(&ctx, value, value_len);
4052                 MD5Final(digest, &ctx);
4053                 dsize = sizeof digest;
4054
4055                 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
4056                                sizeof dsize, (const char *)&dsize,
4057                                sizeof digest, digest,
4058                                (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4059                                sp->myauth.name,
4060                                0);
4061                 break;
4062
4063         case CHAP_SUCCESS:
4064                 if (debug) {
4065                         log(LOG_DEBUG, SPP_FMT "chap success",
4066                             SPP_ARGS(ifp));
4067                         if (len > 4) {
4068                                 addlog(": ");
4069                                 sppp_print_string((char*)(h + 1), len - 4);
4070                         }
4071                         addlog("\n");
4072                 }
4073
4074                 crit_enter();
4075
4076                 sp->pp_flags &= ~PP_NEEDAUTH;
4077                 if (sp->myauth.proto == PPP_CHAP &&
4078                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4079                     (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
4080                         /*
4081                          * We are authenticator for CHAP but didn't
4082                          * complete yet.  Leave it to tlu to proceed
4083                          * to network phase.
4084                          */
4085                         crit_exit();
4086                         break;
4087                 }
4088                 crit_exit();
4089                 sppp_phase_network(sp);
4090                 break;
4091
4092         case CHAP_FAILURE:
4093                 if (debug) {
4094                         log(LOG_INFO, SPP_FMT "chap failure",
4095                             SPP_ARGS(ifp));
4096                         if (len > 4) {
4097                                 addlog(": ");
4098                                 sppp_print_string((char*)(h + 1), len - 4);
4099                         }
4100                         addlog("\n");
4101                 } else
4102                         log(LOG_INFO, SPP_FMT "chap failure\n",
4103                             SPP_ARGS(ifp));
4104                 /* await LCP shutdown by authenticator */
4105                 break;
4106
4107         /* response is my authproto */
4108         case CHAP_RESPONSE:
4109                 value = 1 + (u_char*)(h+1);
4110                 value_len = value[-1];
4111                 name = value + value_len;
4112                 name_len = len - value_len - 5;
4113                 if (name_len < 0) {
4114                         if (debug) {
4115                                 log(LOG_DEBUG,
4116                                     SPP_FMT "chap corrupted response "
4117                                     "<%s id=0x%x len=%d",
4118                                     SPP_ARGS(ifp),
4119                                     sppp_auth_type_name(PPP_CHAP, h->type),
4120                                     h->ident, ntohs(h->len));
4121                                 sppp_print_bytes((u_char*)(h+1), len-4);
4122                                 addlog(">\n");
4123                         }
4124                         break;
4125                 }
4126                 if (h->ident != sp->confid[IDX_CHAP]) {
4127                         if (debug)
4128                                 log(LOG_DEBUG,
4129                                     SPP_FMT "chap dropping response for old ID "
4130                                     "(got %d, expected %d)\n",
4131                                     SPP_ARGS(ifp),
4132                                     h->ident, sp->confid[IDX_CHAP]);
4133                         break;
4134                 }
4135                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
4136                     || bcmp(name, sp->hisauth.name, name_len) != 0) {
4137                         log(LOG_INFO, SPP_FMT "chap response, his name ",
4138                             SPP_ARGS(ifp));
4139                         sppp_print_string(name, name_len);
4140                         addlog(" != expected ");
4141                         sppp_print_string(sp->hisauth.name,
4142                                           sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
4143                         addlog("\n");
4144                 }
4145                 if (debug) {
4146                         log(LOG_DEBUG, SPP_FMT "chap input(%s) "
4147                             "<%s id=0x%x len=%d name=",
4148                             SPP_ARGS(ifp),
4149                             sppp_state_name(sp->state[IDX_CHAP]),
4150                             sppp_auth_type_name(PPP_CHAP, h->type),
4151                             h->ident, ntohs (h->len));
4152                         sppp_print_string((char*)name, name_len);
4153                         addlog(" value-size=%d value=", value_len);
4154                         sppp_print_bytes(value, value_len);
4155                         addlog(">\n");
4156                 }
4157                 if (value_len != AUTHKEYLEN) {
4158                         if (debug)
4159                                 log(LOG_DEBUG,
4160                                     SPP_FMT "chap bad hash value length: "
4161                                     "%d bytes, should be %d\n",
4162                                     SPP_ARGS(ifp), value_len,
4163                                     AUTHKEYLEN);
4164                         break;
4165                 }
4166
4167                 MD5Init(&ctx);
4168                 MD5Update(&ctx, &h->ident, 1);
4169                 MD5Update(&ctx, sp->hisauth.secret,
4170                           sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
4171                 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
4172                 MD5Final(digest, &ctx);
4173
4174 #define FAILMSG "Failed..."
4175 #define SUCCMSG "Welcome!"
4176
4177                 if (value_len != sizeof digest ||
4178                     bcmp(digest, value, value_len) != 0) {
4179                         /* action scn, tld */
4180                         sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
4181                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4182                                        0);
4183                         chap.tld(sp);
4184                         break;
4185                 }
4186                 /* action sca, perhaps tlu */
4187                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
4188                     sp->state[IDX_CHAP] == STATE_OPENED)
4189                         sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
4190                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4191                                        0);
4192                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
4193                         sppp_cp_change_state(&chap, sp, STATE_OPENED);
4194                         chap.tlu(sp);
4195                 }
4196                 break;
4197
4198         default:
4199                 /* Unknown CHAP packet type -- ignore. */
4200                 if (debug) {
4201                         log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
4202                             "<0x%x id=0x%xh len=%d",
4203                             SPP_ARGS(ifp),
4204                             sppp_state_name(sp->state[IDX_CHAP]),
4205                             h->type, h->ident, ntohs(h->len));
4206                         sppp_print_bytes((u_char*)(h+1), len-4);
4207                         addlog(">\n");
4208                 }
4209                 break;
4210
4211         }
4212 }
4213
4214 static void
4215 sppp_chap_init(struct sppp *sp)
4216 {
4217         /* Chap doesn't have STATE_INITIAL at all. */
4218         sp->state[IDX_CHAP] = STATE_CLOSED;
4219         sp->fail_counter[IDX_CHAP] = 0;
4220         sp->pp_seq[IDX_CHAP] = 0;
4221         sp->pp_rseq[IDX_CHAP] = 0;
4222 #if defined(__DragonFly__)
4223         callout_init(&sp->timeout[IDX_CHAP]);
4224 #endif
4225 }
4226
4227 static void
4228 sppp_chap_open(struct sppp *sp)
4229 {
4230         if (sp->myauth.proto == PPP_CHAP &&
4231             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4232                 /* we are authenticator for CHAP, start it */
4233                 chap.scr(sp);
4234                 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4235                 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4236         }
4237         /* nothing to be done if we are peer, await a challenge */
4238 }
4239
4240 static void
4241 sppp_chap_close(struct sppp *sp)
4242 {
4243         if (sp->state[IDX_CHAP] != STATE_CLOSED)
4244                 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4245 }
4246
4247 static void
4248 sppp_chap_TO(void *cookie)
4249 {
4250         struct sppp *sp = (struct sppp *)cookie;
4251         STDDCL;
4252
4253         crit_enter();
4254
4255         if (debug)
4256                 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
4257                     SPP_ARGS(ifp),
4258                     sppp_state_name(sp->state[IDX_CHAP]),
4259                     sp->rst_counter[IDX_CHAP]);
4260
4261         if (--sp->rst_counter[IDX_CHAP] < 0)
4262                 /* TO- event */
4263                 switch (sp->state[IDX_CHAP]) {
4264                 case STATE_REQ_SENT:
4265                         chap.tld(sp);
4266                         sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4267                         break;
4268                 }
4269         else
4270                 /* TO+ (or TO*) event */
4271                 switch (sp->state[IDX_CHAP]) {
4272                 case STATE_OPENED:
4273                         /* TO* event */
4274                         sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4275                         /* fall through */
4276                 case STATE_REQ_SENT:
4277                         chap.scr(sp);
4278                         /* sppp_cp_change_state() will restart the timer */
4279                         sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4280                         break;
4281                 }
4282
4283         crit_exit();
4284 }
4285
4286 static void
4287 sppp_chap_tlu(struct sppp *sp)
4288 {
4289         STDDCL;
4290         int i;
4291
4292         i = 0;
4293         sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4294
4295         /*
4296          * Some broken CHAP implementations (Conware CoNet, firmware
4297          * 4.0.?) don't want to re-authenticate their CHAP once the
4298          * initial challenge-response exchange has taken place.
4299          * Provide for an option to avoid rechallenges.
4300          */
4301         if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
4302                 /*
4303                  * Compute the re-challenge timeout.  This will yield
4304                  * a number between 300 and 810 seconds.
4305                  */
4306                 i = 300 + ((unsigned)(krandom() & 0xff00) >> 7);
4307                 callout_reset(&sp->timeout[IDX_CHAP], i * hz, chap.TO, sp);
4308         }
4309
4310         if (debug) {
4311                 log(LOG_DEBUG,
4312                     SPP_FMT "chap %s, ",
4313                     SPP_ARGS(ifp),
4314                     sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
4315                 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
4316                         addlog("next re-challenge in %d seconds\n", i);
4317                 else
4318                         addlog("re-challenging supressed\n");
4319         }
4320
4321         crit_enter();
4322
4323         /* indicate to LCP that we need to be closed down */
4324         sp->lcp.protos |= (1 << IDX_CHAP);
4325
4326         if (sp->pp_flags & PP_NEEDAUTH) {
4327                 /*
4328                  * Remote is authenticator, but his auth proto didn't
4329                  * complete yet.  Defer the transition to network
4330                  * phase.
4331                  */
4332                 crit_exit();
4333                 return;
4334         }
4335
4336         crit_exit();
4337
4338         /*
4339          * If we are already in phase network, we are done here.  This
4340          * is the case if this is a dummy tlu event after a re-challenge.
4341          */
4342         if (sp->pp_phase != PHASE_NETWORK)
4343                 sppp_phase_network(sp);
4344 }
4345
4346 static void
4347 sppp_chap_tld(struct sppp *sp)
4348 {
4349         STDDCL;
4350
4351         if (debug)
4352                 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
4353         callout_stop(&sp->timeout[IDX_CHAP]);
4354         sp->lcp.protos &= ~(1 << IDX_CHAP);
4355
4356         lcp.Close(sp);
4357 }
4358
4359 static void
4360 sppp_chap_scr(struct sppp *sp)
4361 {
4362         u_long *ch, seed;
4363         u_char clen;
4364
4365         /* Compute random challenge. */
4366         ch = (u_long *)sp->myauth.challenge;
4367 #if defined(__DragonFly__)
4368         read_random(&seed, sizeof seed);
4369 #else
4370         {
4371         struct timeval tv;
4372         microtime(&tv);
4373         seed = tv.tv_sec ^ tv.tv_usec;
4374         }
4375 #endif
4376         ch[0] = seed ^ krandom();
4377         ch[1] = seed ^ krandom();
4378         ch[2] = seed ^ krandom();
4379         ch[3] = seed ^ krandom();
4380         clen = AUTHKEYLEN;
4381
4382         sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP];
4383
4384         sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
4385                        sizeof clen, (const char *)&clen,
4386                        (size_t)AUTHKEYLEN, sp->myauth.challenge,
4387                        (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4388                        sp->myauth.name,
4389                        0);
4390 }
4391
4392 /*
4393  *--------------------------------------------------------------------------*
4394  *                                                                          *
4395  *                        The PAP implementation.                           *
4396  *                                                                          *
4397  *--------------------------------------------------------------------------*
4398  */
4399 /*
4400  * For PAP, we need to keep a little state also if we are the peer, not the
4401  * authenticator.  This is since we don't get a request to authenticate, but
4402  * have to repeatedly authenticate ourself until we got a response (or the
4403  * retry counter is expired).
4404  */
4405
4406 /*
4407  * Handle incoming PAP packets.  */
4408 static void
4409 sppp_pap_input(struct sppp *sp, struct mbuf *m)
4410 {
4411         STDDCL;
4412         struct lcp_header *h;
4413         int len;
4414         u_char *name, *passwd, mlen;
4415         int name_len, passwd_len;
4416
4417         /*
4418          * Malicious input might leave this uninitialized, so
4419          * init to an impossible value.
4420          */
4421         passwd_len = -1;
4422
4423         len = m->m_pkthdr.len;
4424         if (len < 5) {
4425                 if (debug)
4426                         log(LOG_DEBUG,
4427                             SPP_FMT "pap invalid packet length: %d bytes\n",
4428                             SPP_ARGS(ifp), len);
4429                 return;
4430         }
4431         h = mtod (m, struct lcp_header*);
4432         if (len > ntohs (h->len))
4433                 len = ntohs (h->len);
4434         switch (h->type) {
4435         /* PAP request is my authproto */
4436         case PAP_REQ:
4437                 name = 1 + (u_char*)(h+1);
4438                 name_len = name[-1];
4439                 passwd = name + name_len + 1;
4440                 if (name_len > len - 6 ||
4441                     (passwd_len = passwd[-1]) > len - 6 - name_len) {
4442                         if (debug) {
4443                                 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4444                                     "<%s id=0x%x len=%d",
4445                                     SPP_ARGS(ifp),
4446                                     sppp_auth_type_name(PPP_PAP, h->type),
4447                                     h->ident, ntohs(h->len));
4448                                 sppp_print_bytes((u_char*)(h+1), len-4);
4449                                 addlog(">\n");
4450                         }
4451                         break;
4452                 }
4453                 if (debug) {
4454                         log(LOG_DEBUG, SPP_FMT "pap input(%s) "
4455                             "<%s id=0x%x len=%d name=",
4456                             SPP_ARGS(ifp),
4457                             sppp_state_name(sp->state[IDX_PAP]),
4458                             sppp_auth_type_name(PPP_PAP, h->type),
4459                             h->ident, ntohs(h->len));
4460                         sppp_print_string((char*)name, name_len);
4461                         addlog(" passwd=");
4462                         sppp_print_string((char*)passwd, passwd_len);
4463                         addlog(">\n");
4464                 }
4465                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) ||
4466                     passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) ||
4467                     bcmp(name, sp->hisauth.name, name_len) != 0 ||
4468                     bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
4469                         /* action scn, tld */
4470                         mlen = sizeof(FAILMSG) - 1;
4471                         sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
4472                                        sizeof mlen, (const char *)&mlen,
4473                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4474                                        0);
4475                         pap.tld(sp);
4476                         break;
4477                 }
4478                 /* action sca, perhaps tlu */
4479                 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
4480                     sp->state[IDX_PAP] == STATE_OPENED) {
4481                         mlen = sizeof(SUCCMSG) - 1;
4482                         sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
4483                                        sizeof mlen, (const char *)&mlen,
4484                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4485                                        0);
4486                 }
4487                 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
4488                         sppp_cp_change_state(&pap, sp, STATE_OPENED);
4489                         pap.tlu(sp);
4490                 }
4491                 break;
4492
4493         /* ack and nak are his authproto */
4494         case PAP_ACK:
4495                 callout_stop(&sp->pap_my_to);
4496                 if (debug) {
4497                         log(LOG_DEBUG, SPP_FMT "pap success",
4498                             SPP_ARGS(ifp));
4499                         name = 1 + (u_char *)(h + 1);
4500                         name_len = name[-1];
4501                         if (len > 5 && name_len < len+4) {
4502                                 addlog(": ");
4503                                 sppp_print_string(name, name_len);
4504                         }
4505                         addlog("\n");
4506                 }
4507
4508                 crit_enter();
4509
4510                 sp->pp_flags &= ~PP_NEEDAUTH;
4511                 if (sp->myauth.proto == PPP_PAP &&
4512                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4513                     (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
4514                         /*
4515                          * We are authenticator for PAP but didn't
4516                          * complete yet.  Leave it to tlu to proceed
4517                          * to network phase.
4518                          */
4519
4520                         crit_exit();
4521
4522                         break;
4523                 }
4524
4525                 crit_exit();
4526
4527                 sppp_phase_network(sp);
4528                 break;
4529
4530         case PAP_NAK:
4531                 callout_stop(&sp->pap_my_to);
4532                 if (debug) {
4533                         log(LOG_INFO, SPP_FMT "pap failure",
4534                             SPP_ARGS(ifp));
4535                         name = 1 + (u_char *)(h + 1);
4536                         name_len = name[-1];
4537                         if (len > 5 && name_len < len+4) {
4538                                 addlog(": ");
4539                                 sppp_print_string(name, name_len);
4540                         }
4541                         addlog("\n");
4542                 } else
4543                         log(LOG_INFO, SPP_FMT "pap failure\n",
4544                             SPP_ARGS(ifp));
4545                 /* await LCP shutdown by authenticator */
4546                 break;
4547
4548         default:
4549                 /* Unknown PAP packet type -- ignore. */
4550                 if (debug) {
4551                         log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4552                             "<0x%x id=0x%x len=%d",
4553                             SPP_ARGS(ifp),
4554                             h->type, h->ident, ntohs(h->len));
4555                         sppp_print_bytes((u_char*)(h+1), len-4);
4556                         addlog(">\n");
4557                 }
4558                 break;
4559
4560         }
4561 }
4562
4563 static void
4564 sppp_pap_init(struct sppp *sp)
4565 {
4566         /* PAP doesn't have STATE_INITIAL at all. */
4567         sp->state[IDX_PAP] = STATE_CLOSED;
4568         sp->fail_counter[IDX_PAP] = 0;
4569         sp->pp_seq[IDX_PAP] = 0;
4570         sp->pp_rseq[IDX_PAP] = 0;
4571 #if defined(__DragonFly__)
4572         callout_init(&sp->timeout[IDX_PAP]);
4573         callout_init(&sp->pap_my_to);
4574 #endif
4575 }
4576
4577 static void
4578 sppp_pap_open(struct sppp *sp)
4579 {
4580         if (sp->hisauth.proto == PPP_PAP &&
4581             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4582                 /* we are authenticator for PAP, start our timer */
4583                 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4584                 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4585         }
4586         if (sp->myauth.proto == PPP_PAP) {
4587                 /* we are peer, send a request, and start a timer */
4588                 pap.scr(sp);
4589                 callout_reset(&sp->pap_my_to, sp->lcp.timeout,
4590                                 sppp_pap_my_TO, sp);
4591         }
4592 }
4593
4594 static void
4595 sppp_pap_close(struct sppp *sp)
4596 {
4597         if (sp->state[IDX_PAP] != STATE_CLOSED)
4598                 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4599 }
4600
4601 /*
4602  * That's the timeout routine if we are authenticator.  Since the
4603  * authenticator is basically passive in PAP, we can't do much here.
4604  */
4605 static void
4606 sppp_pap_TO(void *cookie)
4607 {
4608         struct sppp *sp = (struct sppp *)cookie;
4609         STDDCL;
4610
4611         crit_enter();
4612
4613         if (debug)
4614                 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
4615                     SPP_ARGS(ifp),
4616                     sppp_state_name(sp->state[IDX_PAP]),
4617                     sp->rst_counter[IDX_PAP]);
4618
4619         if (--sp->rst_counter[IDX_PAP] < 0)
4620                 /* TO- event */
4621                 switch (sp->state[IDX_PAP]) {
4622                 case STATE_REQ_SENT:
4623                         pap.tld(sp);
4624                         sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4625                         break;
4626                 }
4627         else
4628                 /* TO+ event, not very much we could do */
4629                 switch (sp->state[IDX_PAP]) {
4630                 case STATE_REQ_SENT:
4631                         /* sppp_cp_change_state() will restart the timer */
4632                         sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4633                         break;
4634                 }
4635
4636         crit_exit();
4637 }
4638
4639 /*
4640  * That's the timeout handler if we are peer.  Since the peer is active,
4641  * we need to retransmit our PAP request since it is apparently lost.
4642  * XXX We should impose a max counter.
4643  */
4644 static void
4645 sppp_pap_my_TO(void *cookie)
4646 {
4647         struct sppp *sp = (struct sppp *)cookie;
4648         STDDCL;
4649
4650         if (debug)
4651                 log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
4652                     SPP_ARGS(ifp));
4653
4654         pap.scr(sp);
4655 }
4656
4657 static void
4658 sppp_pap_tlu(struct sppp *sp)
4659 {
4660         STDDCL;
4661
4662         sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4663
4664         if (debug)
4665                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
4666                     SPP_ARGS(ifp), pap.name);
4667
4668         crit_enter();
4669
4670         /* indicate to LCP that we need to be closed down */
4671         sp->lcp.protos |= (1 << IDX_PAP);
4672
4673         if (sp->pp_flags & PP_NEEDAUTH) {
4674                 /*
4675                  * Remote is authenticator, but his auth proto didn't
4676                  * complete yet.  Defer the transition to network
4677                  * phase.
4678                  */
4679                 crit_exit();
4680                 return;
4681         }
4682         crit_exit();
4683         sppp_phase_network(sp);
4684 }
4685
4686 static void
4687 sppp_pap_tld(struct sppp *sp)
4688 {
4689         STDDCL;
4690
4691         if (debug)
4692                 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
4693         callout_stop(&sp->timeout[IDX_PAP]);
4694         callout_stop(&sp->pap_my_to);
4695         sp->lcp.protos &= ~(1 << IDX_PAP);
4696
4697         lcp.Close(sp);
4698 }
4699
4700 static void
4701 sppp_pap_scr(struct sppp *sp)
4702 {
4703         u_char idlen, pwdlen;
4704
4705         sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP];
4706         pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
4707         idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
4708
4709         sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
4710                        sizeof idlen, (const char *)&idlen,
4711                        (size_t)idlen, sp->myauth.name,
4712                        sizeof pwdlen, (const char *)&pwdlen,
4713                        (size_t)pwdlen, sp->myauth.secret,
4714                        0);
4715 }
4716
4717 /*
4718  * Random miscellaneous functions.
4719  */
4720
4721 /*
4722  * Send a PAP or CHAP proto packet.
4723  *
4724  * Varadic function, each of the elements for the ellipsis is of type
4725  * ``size_t mlen, const u_char *msg''.  Processing will stop iff
4726  * mlen == 0.
4727  * NOTE: never declare variadic functions with types subject to type
4728  * promotion (i.e. u_char). This is asking for big trouble depending
4729  * on the architecture you are on...
4730  */
4731
4732 static void
4733 sppp_auth_send(const struct cp *cp, struct sppp *sp,
4734                unsigned int type, unsigned int id,
4735                ...)
4736 {
4737         STDDCL;
4738         struct ppp_header *h;
4739         struct lcp_header *lh;
4740         struct mbuf *m;
4741         u_char *p;
4742         int len;
4743         unsigned int mlen;
4744         const char *msg;
4745         __va_list ap;
4746
4747         MGETHDR (m, MB_DONTWAIT, MT_DATA);
4748         if (! m)
4749                 return;
4750         m->m_pkthdr.rcvif = 0;
4751
4752         h = mtod (m, struct ppp_header*);
4753         h->address = PPP_ALLSTATIONS;           /* broadcast address */
4754         h->control = PPP_UI;                    /* Unnumbered Info */
4755         h->protocol = htons(cp->proto);
4756
4757         lh = (struct lcp_header*)(h + 1);
4758         lh->type = type;
4759         lh->ident = id;
4760         p = (u_char*) (lh+1);
4761
4762         __va_start(ap, id);
4763         len = 0;
4764
4765         while ((mlen = (unsigned int)__va_arg(ap, size_t)) != 0) {
4766                 msg = __va_arg(ap, const char *);
4767                 len += mlen;
4768                 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
4769                         __va_end(ap);
4770                         m_freem(m);
4771                         return;
4772                 }
4773
4774                 bcopy(msg, p, mlen);
4775                 p += mlen;
4776         }
4777         __va_end(ap);
4778
4779         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
4780         lh->len = htons (LCP_HEADER_LEN + len);
4781
4782         if (debug) {
4783                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
4784                     SPP_ARGS(ifp), cp->name,
4785                     sppp_auth_type_name(cp->proto, lh->type),
4786                     lh->ident, ntohs(lh->len));
4787                 sppp_print_bytes((u_char*) (lh+1), len);
4788                 addlog(">\n");
4789         }
4790         if (IF_QFULL (&sp->pp_cpq)) {
4791                 IF_DROP (&sp->pp_fastq);
4792                 IF_DROP (&ifp->if_snd);
4793                 m_freem (m);
4794                 ++ifp->if_oerrors;
4795         } else
4796                 IF_ENQUEUE (&sp->pp_cpq, m);
4797         if (! (ifp->if_flags & IFF_OACTIVE))
4798                 (*ifp->if_start) (ifp);
4799         ifp->if_obytes += m->m_pkthdr.len + 3;
4800 }
4801
4802 /*
4803  * Send keepalive packets, every 10 seconds.
4804  */
4805 static void
4806 sppp_keepalive(void *dummy)
4807 {
4808         struct sppp *sp;
4809
4810         crit_enter();
4811
4812         for (sp=spppq; sp; sp=sp->pp_next) {
4813                 struct ifnet *ifp = &sp->pp_if;
4814
4815                 /* Keepalive mode disabled or channel down? */
4816                 if (! (sp->pp_flags & PP_KEEPALIVE) ||
4817                     ! (ifp->if_flags & IFF_RUNNING))
4818                         continue;
4819
4820                 /* No keepalive in PPP mode if LCP not opened yet. */
4821                 if (sp->pp_mode != IFF_CISCO &&
4822                     sp->pp_phase < PHASE_AUTHENTICATE)
4823                         continue;
4824
4825                 if (sp->pp_alivecnt == MAXALIVECNT) {
4826                         /* No keepalive packets got.  Stop the interface. */
4827                         printf (SPP_FMT "down\n", SPP_ARGS(ifp));
4828                         if_down (ifp);
4829                         IF_DRAIN(&sp->pp_cpq);
4830                         if (sp->pp_mode != IFF_CISCO) {
4831                                 /* XXX */
4832                                 /* Shut down the PPP link. */
4833                                 lcp.Down(sp);
4834                                 /* Initiate negotiation. XXX */
4835                                 lcp.Up(sp);
4836                         }
4837                 }
4838                 lwkt_serialize_enter(ifp->if_serializer);
4839                 if (sp->pp_alivecnt <= MAXALIVECNT)
4840                         ++sp->pp_alivecnt;
4841                 if (sp->pp_mode == IFF_CISCO)
4842                         sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ,
4843                                  ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]);
4844                 else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
4845                         long nmagic = htonl (sp->lcp.magic);
4846                         sp->lcp.echoid = ++sp->pp_seq[IDX_LCP];
4847                         sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
4848                                 sp->lcp.echoid, 4, &nmagic);
4849                 }
4850                 lwkt_serialize_exit(ifp->if_serializer);
4851         }
4852         callout_reset(&keepalive_timeout, hz * 10, sppp_keepalive, NULL);
4853         crit_exit();
4854 }
4855
4856 /*
4857  * Get both IP addresses.
4858  */
4859 static void
4860 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
4861 {
4862         struct ifnet *ifp = &sp->pp_if;
4863         struct ifaddr *ifa;
4864         struct sockaddr_in *si, *sm;
4865         u_long ssrc, ddst;
4866
4867         sm = NULL;
4868         ssrc = ddst = 0L;
4869         /*
4870          * Pick the first AF_INET address from the list,
4871          * aliases don't make any sense on a p2p link anyway.
4872          */
4873         si = 0;
4874 #if defined(__DragonFly__)
4875         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4876 #elif defined(__NetBSD__) || defined (__OpenBSD__)
4877         for (ifa = ifp->if_addrlist.tqh_first;
4878              ifa;
4879              ifa = ifa->ifa_list.tqe_next)
4880 #else
4881         for (ifa = ifp->if_addrlist;
4882              ifa;
4883              ifa = ifa->ifa_next)
4884 #endif
4885                 if (ifa->ifa_addr->sa_family == AF_INET) {
4886                         si = (struct sockaddr_in *)ifa->ifa_addr;
4887                         sm = (struct sockaddr_in *)ifa->ifa_netmask;
4888                         if (si)
4889                                 break;
4890                 }
4891         if (ifa) {
4892                 if (si && si->sin_addr.s_addr) {
4893                         ssrc = si->sin_addr.s_addr;
4894                         if (srcmask)
4895                                 *srcmask = ntohl(sm->sin_addr.s_addr);
4896                 }
4897
4898                 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
4899                 if (si && si->sin_addr.s_addr)
4900                         ddst = si->sin_addr.s_addr;
4901         }
4902
4903         if (dst) *dst = ntohl(ddst);
4904         if (src) *src = ntohl(ssrc);
4905 }
4906
4907 /*
4908  * Set my IP address.  Must be called at splimp.
4909  */
4910 static void
4911 sppp_set_ip_addr(struct sppp *sp, u_long src)
4912 {
4913         STDDCL;
4914         struct ifaddr *ifa;
4915         struct sockaddr_in *si;
4916         struct in_ifaddr *ia;
4917
4918         /*
4919          * Pick the first AF_INET address from the list,
4920          * aliases don't make any sense on a p2p link anyway.
4921          */
4922         si = 0;
4923 #if defined(__DragonFly__)
4924         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4925 #elif defined(__NetBSD__) || defined (__OpenBSD__)
4926         for (ifa = ifp->if_addrlist.tqh_first;
4927              ifa;
4928              ifa = ifa->ifa_list.tqe_next)
4929 #else
4930         for (ifa = ifp->if_addrlist;
4931              ifa;
4932              ifa = ifa->ifa_next)
4933 #endif
4934         {
4935                 if (ifa->ifa_addr->sa_family == AF_INET)
4936                 {
4937                         si = (struct sockaddr_in *)ifa->ifa_addr;
4938                         if (si)
4939                                 break;
4940                 }
4941         }
4942
4943         if (ifa && si)
4944         {
4945                 int error;
4946 #if __NetBSD_Version__ >= 103080000
4947                 struct sockaddr_in new_sin = *si;
4948
4949                 new_sin.sin_addr.s_addr = htonl(src);
4950                 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 1);
4951                 if(debug && error)
4952                 {
4953                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: in_ifinit "
4954                         " failed, error=%d\n", SPP_ARGS(ifp), error);
4955                 }
4956 #else
4957                 /* delete old route */
4958                 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST);
4959                 if(debug && error)
4960                 {
4961                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
4962                                 SPP_ARGS(ifp), error);
4963                 }
4964
4965                 /* set new address */
4966                 si->sin_addr.s_addr = htonl(src);
4967                 ia = ifatoia(ifa);
4968                 LIST_REMOVE(ia, ia_hash);
4969                 LIST_INSERT_HEAD(INADDR_HASH(si->sin_addr.s_addr), ia, ia_hash);
4970
4971                 /* add new route */
4972                 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST);
4973                 if (debug && error)
4974                 {
4975                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
4976                                 SPP_ARGS(ifp), error);
4977                 }
4978 #endif
4979         }
4980 }
4981
4982 #ifdef INET6
4983 /*
4984  * Get both IPv6 addresses.
4985  */
4986 static void
4987 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst,
4988                    struct in6_addr *srcmask)
4989 {
4990         struct ifnet *ifp = &sp->pp_if;
4991         struct ifaddr *ifa;
4992         struct sockaddr_in6 *si, *sm;
4993         struct in6_addr ssrc, ddst;
4994
4995         sm = NULL;
4996         bzero(&ssrc, sizeof(ssrc));
4997         bzero(&ddst, sizeof(ddst));
4998         /*
4999          * Pick the first link-local AF_INET6 address from the list,
5000          * aliases don't make any sense on a p2p link anyway.
5001          */
5002 #if defined(__DragonFly__)
5003         si = 0;
5004         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
5005 #elif defined(__NetBSD__) || defined (__OpenBSD__)
5006         for (ifa = ifp->if_addrlist.tqh_first, si = 0;
5007              ifa;
5008              ifa = ifa->ifa_list.tqe_next)
5009 #else
5010         for (ifa = ifp->if_addrlist, si = 0;
5011              ifa;
5012              ifa = ifa->ifa_next)
5013 #endif
5014                 if (ifa->ifa_addr->sa_family == AF_INET6) {
5015                         si = (struct sockaddr_in6 *)ifa->ifa_addr;
5016                         sm = (struct sockaddr_in6 *)ifa->ifa_netmask;
5017                         if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr))
5018                                 break;
5019                 }
5020         if (ifa) {
5021                 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) {
5022                         bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc));
5023                         if (srcmask) {
5024                                 bcopy(&sm->sin6_addr, srcmask,
5025                                       sizeof(*srcmask));
5026                         }
5027                 }
5028
5029                 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
5030                 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr))
5031                         bcopy(&si->sin6_addr, &ddst, sizeof(ddst));
5032         }
5033
5034         if (dst)
5035                 bcopy(&ddst, dst, sizeof(*dst));
5036         if (src)
5037                 bcopy(&ssrc, src, sizeof(*src));
5038 }
5039
5040 #ifdef IPV6CP_MYIFID_DYN
5041 /*
5042  * Generate random ifid.
5043  */
5044 static void
5045 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr)
5046 {
5047         /* TBD */
5048 }
5049
5050 /*
5051  * Set my IPv6 address.  Must be called at splimp.
5052  */
5053 static void
5054 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src)
5055 {
5056         STDDCL;
5057         struct ifaddr *ifa;
5058         struct sockaddr_in6 *sin6;
5059
5060         /*
5061          * Pick the first link-local AF_INET6 address from the list,
5062          * aliases don't make any sense on a p2p link anyway.
5063          */
5064
5065         sin6 = NULL;
5066 #if defined(__DragonFly__)
5067         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
5068 #elif defined(__NetBSD__) || defined (__OpenBSD__)
5069         for (ifa = ifp->if_addrlist.tqh_first;
5070              ifa;
5071              ifa = ifa->ifa_list.tqe_next)
5072 #else
5073         for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
5074 #endif
5075         {
5076                 if (ifa->ifa_addr->sa_family == AF_INET6)
5077                 {
5078                         sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
5079                         if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
5080                                 break;
5081                 }
5082         }
5083
5084         if (ifa && sin6)
5085         {
5086                 int error;
5087                 struct sockaddr_in6 new_sin6 = *sin6;
5088
5089                 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr));
5090                 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1);
5091                 if (debug && error)
5092                 {
5093                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit "
5094                             " failed, error=%d\n", SPP_ARGS(ifp), error);
5095                 }
5096         }
5097 }
5098 #endif
5099
5100 /*
5101  * Suggest a candidate address to be used by peer.
5102  */
5103 static void
5104 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest)
5105 {
5106         struct in6_addr myaddr;
5107         struct timeval tv;
5108
5109         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
5110
5111         myaddr.s6_addr[8] &= ~0x02;     /* u bit to "local" */
5112         microtime(&tv);
5113         if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) {
5114                 myaddr.s6_addr[14] ^= 0xff;
5115                 myaddr.s6_addr[15] ^= 0xff;
5116         } else {
5117                 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff);
5118                 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff);
5119         }
5120         if (suggest)
5121                 bcopy(&myaddr, suggest, sizeof(myaddr));
5122 }
5123 #endif /*INET6*/
5124
5125 static int
5126 sppp_params(struct sppp *sp, u_long cmd, void *data)
5127 {
5128         u_long subcmd;
5129         struct ifreq *ifr = (struct ifreq *)data;
5130         struct spppreq *spr;
5131         int rv = 0;
5132
5133         spr = kmalloc(sizeof(struct spppreq), M_TEMP, M_INTWAIT);
5134
5135         /*
5136          * ifr->ifr_data is supposed to point to a struct spppreq.
5137          * Check the cmd word first before attempting to fetch all the
5138          * data.
5139          */
5140         if ((subcmd = fuword(ifr->ifr_data)) == -1) {
5141                 rv = EFAULT;
5142                 goto quit;
5143         }
5144
5145         if (copyin((caddr_t)ifr->ifr_data, spr, sizeof(struct spppreq)) != 0) {
5146                 rv = EFAULT;
5147                 goto quit;
5148         }
5149
5150         switch (subcmd) {
5151         case (int)SPPPIOGDEFS:
5152                 if (cmd != SIOCGIFGENERIC) {
5153                         rv = EINVAL;
5154                         break;
5155                 }
5156                 /*
5157                  * We copy over the entire current state, but clean
5158                  * out some of the stuff we don't wanna pass up.
5159                  * Remember, SIOCGIFGENERIC is unprotected, and can be
5160                  * called by any user.  No need to ever get PAP or
5161                  * CHAP secrets back to userland anyway.
5162                  */
5163                 spr->defs.pp_phase = sp->pp_phase;
5164                 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0;
5165                 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0;
5166                 spr->defs.lcp = sp->lcp;
5167                 spr->defs.ipcp = sp->ipcp;
5168                 spr->defs.ipv6cp = sp->ipv6cp;
5169                 spr->defs.myauth = sp->myauth;
5170                 spr->defs.hisauth = sp->hisauth;
5171                 bzero(spr->defs.myauth.secret, AUTHKEYLEN);
5172                 bzero(spr->defs.myauth.challenge, AUTHKEYLEN);
5173                 bzero(spr->defs.hisauth.secret, AUTHKEYLEN);
5174                 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN);
5175                 /*
5176                  * Fixup the LCP timeout value to milliseconds so
5177                  * spppcontrol doesn't need to bother about the value
5178                  * of "hz".  We do the reverse calculation below when
5179                  * setting it.
5180                  */
5181                 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz;
5182                 rv = copyout(spr, (caddr_t)ifr->ifr_data,
5183                              sizeof(struct spppreq));
5184                 break;
5185
5186         case (int)SPPPIOSDEFS:
5187                 if (cmd != SIOCSIFGENERIC) {
5188                         rv = EINVAL;
5189                         break;
5190                 }
5191                 /*
5192                  * We have a very specific idea of which fields we
5193                  * allow being passed back from userland, so to not
5194                  * clobber our current state.  For one, we only allow
5195                  * setting anything if LCP is in dead or establish
5196                  * phase.  Once the authentication negotiations
5197                  * started, the authentication settings must not be
5198                  * changed again.  (The administrator can force an
5199                  * ifconfig down in order to get LCP back into dead
5200                  * phase.)
5201                  *
5202                  * Also, we only allow for authentication parameters to be
5203                  * specified.
5204                  *
5205                  * XXX Should allow to set or clear pp_flags.
5206                  *
5207                  * Finally, if the respective authentication protocol to
5208                  * be used is set differently than 0, but the secret is
5209                  * passed as all zeros, we don't trash the existing secret.
5210                  * This allows an administrator to change the system name
5211                  * only without clobbering the secret (which he didn't get
5212                  * back in a previous SPPPIOGDEFS call).  However, the
5213                  * secrets are cleared if the authentication protocol is
5214                  * reset to 0.  */
5215                 if (sp->pp_phase != PHASE_DEAD &&
5216                     sp->pp_phase != PHASE_ESTABLISH) {
5217                         rv = EBUSY;
5218                         break;
5219                 }
5220
5221                 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP &&
5222                      spr->defs.myauth.proto != PPP_CHAP) ||
5223                     (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP &&
5224                      spr->defs.hisauth.proto != PPP_CHAP)) {
5225                         rv = EINVAL;
5226                         break;
5227                 }
5228
5229                 if (spr->defs.myauth.proto == 0)
5230                         /* resetting myauth */
5231                         bzero(&sp->myauth, sizeof sp->myauth);
5232                 else {
5233                         /* setting/changing myauth */
5234                         sp->myauth.proto = spr->defs.myauth.proto;
5235                         bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
5236                         if (spr->defs.myauth.secret[0] != '\0')
5237                                 bcopy(spr->defs.myauth.secret, sp->myauth.secret,
5238                                       AUTHKEYLEN);
5239                 }
5240                 if (spr->defs.hisauth.proto == 0)
5241                         /* resetting hisauth */
5242                         bzero(&sp->hisauth, sizeof sp->hisauth);
5243                 else {
5244                         /* setting/changing hisauth */
5245                         sp->hisauth.proto = spr->defs.hisauth.proto;
5246                         sp->hisauth.flags = spr->defs.hisauth.flags;
5247                         bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
5248                         if (spr->defs.hisauth.secret[0] != '\0')
5249                                 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret,
5250                                       AUTHKEYLEN);
5251                 }
5252                 /* set LCP restart timer timeout */
5253                 if (spr->defs.lcp.timeout != 0)
5254                         sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000;
5255                 /* set VJ enable and IPv6 disable flags */
5256 #ifdef INET
5257                 if (spr->defs.enable_vj)
5258                         sp->confflags |= CONF_ENABLE_VJ;
5259                 else
5260                         sp->confflags &= ~CONF_ENABLE_VJ;
5261 #endif
5262 #ifdef INET6
5263                 if (spr->defs.enable_ipv6)
5264                         sp->confflags |= CONF_ENABLE_IPV6;
5265                 else
5266                         sp->confflags &= ~CONF_ENABLE_IPV6;
5267 #endif
5268                 break;
5269
5270         default:
5271                 rv = EINVAL;
5272         }
5273
5274  quit:
5275         kfree(spr, M_TEMP);
5276
5277         return (rv);
5278 }
5279
5280 static void
5281 sppp_phase_network(struct sppp *sp)
5282 {
5283         STDDCL;
5284         int i;
5285         u_long mask;
5286
5287         sp->pp_phase = PHASE_NETWORK;
5288
5289         if (debug)
5290                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
5291                     sppp_phase_name(sp->pp_phase));
5292
5293         /* Notify NCPs now. */
5294         for (i = 0; i < IDX_COUNT; i++)
5295                 if ((cps[i])->flags & CP_NCP)
5296                         (cps[i])->Open(sp);
5297
5298         /* Send Up events to all NCPs. */
5299         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
5300                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP))
5301                         (cps[i])->Up(sp);
5302
5303         /* if no NCP is starting, all this was in vain, close down */
5304         sppp_lcp_check_and_close(sp);
5305 }
5306
5307
5308 static const char *
5309 sppp_cp_type_name(u_char type)
5310 {
5311         static char buf[12];
5312         switch (type) {
5313         case CONF_REQ:   return "conf-req";
5314         case CONF_ACK:   return "conf-ack";
5315         case CONF_NAK:   return "conf-nak";
5316         case CONF_REJ:   return "conf-rej";
5317         case TERM_REQ:   return "term-req";
5318         case TERM_ACK:   return "term-ack";
5319         case CODE_REJ:   return "code-rej";
5320         case PROTO_REJ:  return "proto-rej";
5321         case ECHO_REQ:   return "echo-req";
5322         case ECHO_REPLY: return "echo-reply";
5323         case DISC_REQ:   return "discard-req";
5324         }
5325         ksnprintf (buf, sizeof(buf), "cp/0x%x", type);
5326         return buf;
5327 }
5328
5329 static const char *
5330 sppp_auth_type_name(u_short proto, u_char type)
5331 {
5332         static char buf[12];
5333         switch (proto) {
5334         case PPP_CHAP:
5335                 switch (type) {
5336                 case CHAP_CHALLENGE:    return "challenge";
5337                 case CHAP_RESPONSE:     return "response";
5338                 case CHAP_SUCCESS:      return "success";
5339                 case CHAP_FAILURE:      return "failure";
5340                 }
5341         case PPP_PAP:
5342                 switch (type) {
5343                 case PAP_REQ:           return "req";
5344                 case PAP_ACK:           return "ack";
5345                 case PAP_NAK:           return "nak";
5346                 }
5347         }
5348         ksnprintf (buf, sizeof(buf), "auth/0x%x", type);
5349         return buf;
5350 }
5351
5352 static const char *
5353 sppp_lcp_opt_name(u_char opt)
5354 {
5355         static char buf[12];
5356         switch (opt) {
5357         case LCP_OPT_MRU:               return "mru";
5358         case LCP_OPT_ASYNC_MAP:         return "async-map";
5359         case LCP_OPT_AUTH_PROTO:        return "auth-proto";
5360         case LCP_OPT_QUAL_PROTO:        return "qual-proto";
5361         case LCP_OPT_MAGIC:             return "magic";
5362         case LCP_OPT_PROTO_COMP:        return "proto-comp";
5363         case LCP_OPT_ADDR_COMP:         return "addr-comp";
5364         }
5365         ksnprintf (buf, sizeof(buf), "lcp/0x%x", opt);
5366         return buf;
5367 }
5368
5369 static const char *
5370 sppp_ipcp_opt_name(u_char opt)
5371 {
5372         static char buf[12];
5373         switch (opt) {
5374         case IPCP_OPT_ADDRESSES:        return "addresses";
5375         case IPCP_OPT_COMPRESSION:      return "compression";
5376         case IPCP_OPT_ADDRESS:          return "address";
5377         }
5378         ksnprintf (buf, sizeof(buf), "ipcp/0x%x", opt);
5379         return buf;
5380 }
5381
5382 #ifdef INET6
5383 static const char *
5384 sppp_ipv6cp_opt_name(u_char opt)
5385 {
5386         static char buf[12];
5387         switch (opt) {
5388         case IPV6CP_OPT_IFID:           return "ifid";
5389         case IPV6CP_OPT_COMPRESSION:    return "compression";
5390         }
5391         ksprintf (buf, "0x%x", opt);
5392         return buf;
5393 }
5394 #endif
5395
5396 static const char *
5397 sppp_state_name(int state)
5398 {
5399         switch (state) {
5400         case STATE_INITIAL:     return "initial";
5401         case STATE_STARTING:    return "starting";
5402         case STATE_CLOSED:      return "closed";
5403         case STATE_STOPPED:     return "stopped";
5404         case STATE_CLOSING:     return "closing";
5405         case STATE_STOPPING:    return "stopping";
5406         case STATE_REQ_SENT:    return "req-sent";
5407         case STATE_ACK_RCVD:    return "ack-rcvd";
5408         case STATE_ACK_SENT:    return "ack-sent";
5409         case STATE_OPENED:      return "opened";
5410         }
5411         return "illegal";
5412 }
5413
5414 static const char *
5415 sppp_phase_name(enum ppp_phase phase)
5416 {
5417         switch (phase) {
5418         case PHASE_DEAD:        return "dead";
5419         case PHASE_ESTABLISH:   return "establish";
5420         case PHASE_TERMINATE:   return "terminate";
5421         case PHASE_AUTHENTICATE: return "authenticate";
5422         case PHASE_NETWORK:     return "network";
5423         }
5424         return "illegal";
5425 }
5426
5427 static const char *
5428 sppp_proto_name(u_short proto)
5429 {
5430         static char buf[12];
5431         switch (proto) {
5432         case PPP_LCP:   return "lcp";
5433         case PPP_IPCP:  return "ipcp";
5434         case PPP_PAP:   return "pap";
5435         case PPP_CHAP:  return "chap";
5436         case PPP_IPV6CP: return "ipv6cp";
5437         }
5438         ksnprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto);
5439         return buf;
5440 }
5441
5442 static void
5443 sppp_print_bytes(const u_char *p, u_short len)
5444 {
5445         if (len)
5446                 addlog(" %*D", len, p, "-");
5447 }
5448
5449 static void
5450 sppp_print_string(const char *p, u_short len)
5451 {
5452         u_char c;
5453
5454         while (len-- > 0) {
5455                 c = *p++;
5456                 /*
5457                  * Print only ASCII chars directly.  RFC 1994 recommends
5458                  * using only them, but we don't rely on it.  */
5459                 if (c < ' ' || c > '~')
5460                         addlog("\\x%x", c);
5461                 else
5462                         addlog("%c", c);
5463         }
5464 }
5465
5466 static const char *
5467 sppp_dotted_quad(u_long addr)
5468 {
5469         static char s[16];
5470         ksprintf(s, "%d.%d.%d.%d",
5471                 (int)((addr >> 24) & 0xff),
5472                 (int)((addr >> 16) & 0xff),
5473                 (int)((addr >> 8) & 0xff),
5474                 (int)(addr & 0xff));
5475         return s;
5476 }
5477
5478 static int
5479 sppp_strnlen(u_char *p, int max)
5480 {
5481         int len;
5482
5483         for (len = 0; len < max && *p; ++p)
5484                 ++len;
5485         return len;
5486 }
5487
5488 /* a dummy, used to drop uninteresting events */
5489 static void
5490 sppp_null(struct sppp *unused)
5491 {
5492         /* do just nothing */
5493 }