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 1.18 2004/09/16 14:56:32 joerg 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 #endif
  49 #include <sys/malloc.h>
  50 #include <sys/mbuf.h>
  51
  52 #if defined (__OpenBSD__)
  53 #include <sys/md5k.h>
  54 #else
  55 #include <sys/md5.h>
  56 #endif
  57
  58 #include <net/if.h>
  59 #include <net/netisr.h>
  60 #include <net/if_types.h>
  61 #include <net/route.h>
  62 #include <netinet/in.h>
  63 #include <netinet/in_systm.h>
  64 #include <netinet/ip.h>
  65 #include <net/slcompress.h>
  66
  67 #if defined (__NetBSD__) || defined (__OpenBSD__)
  68 #include <machine/cpu.h> /* XXX for softnet */
  69 #endif
  70
  71 #include <machine/stdarg.h>
  72
  73 #include <netinet/in.h>
  74 #include <netinet/in_systm.h>
  75 #include <netinet/in_var.h>
  76
  77 #ifdef INET
  78 #include <netinet/ip.h>
  79 #include <netinet/tcp.h>
  80 #endif
  81
  82 #if defined (__DragonFly__) || defined (__OpenBSD__)
  83 # include <netinet/if_ether.h>
  84 #else
  85 # include <net/ethertypes.h>
  86 #endif
  87
  88 #ifdef IPX
  89 #include <netproto/ipx/ipx.h>
  90 #include <netproto/ipx/ipx_if.h>
  91 #endif
  92
  93 #ifdef NS
  94 #include <netns/ns.h>
  95 #include <netns/ns_if.h>
  96 #endif
  97
  98 #include "if_sppp.h"
  99
 100 #define IOCTL_CMD_T     u_long
 101 #define MAXALIVECNT     3               /* max. alive packets */
 102
 103 /*
 104  * Interface flags that can be set in an ifconfig command.
 105  *
 106  * Setting link0 will make the link passive, i.e. it will be marked
 107  * as being administrative openable, but won't be opened to begin
 108  * with.  Incoming calls will be answered, or subsequent calls with
 109  * -link1 will cause the administrative open of the LCP layer.
 110  *
 111  * Setting link1 will cause the link to auto-dial only as packets
 112  * arrive to be sent.
 113  *
 114  * Setting IFF_DEBUG will syslog the option negotiation and state
 115  * transitions at level kern.debug.  Note: all logs consistently look
 116  * like
 117  *
 118  *   <if-name><unit>: <proto-name> <additional info...>
 119  *
 120  * with <if-name><unit> being something like "bppp0", and <proto-name>
 121  * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
 122  */
 123
 124 #define IFF_PASSIVE     IFF_LINK0       /* wait passively for connection */
 125 #define IFF_AUTO        IFF_LINK1       /* auto-dial on output */
 126 #define IFF_CISCO       IFF_LINK2       /* auto-dial on output */
 127
 128 #define PPP_ALLSTATIONS 0xff            /* All-Stations broadcast address */
 129 #define PPP_UI          0x03            /* Unnumbered Information */
 130 #define PPP_IP          0x0021          /* Internet Protocol */
 131 #define PPP_ISO         0x0023          /* ISO OSI Protocol */
 132 #define PPP_XNS         0x0025          /* Xerox NS Protocol */
 133 #define PPP_IPX         0x002b          /* Novell IPX Protocol */
 134 #define PPP_VJ_COMP     0x002d          /* VJ compressed TCP/IP */
 135 #define PPP_VJ_UCOMP    0x002f          /* VJ uncompressed TCP/IP */
 136 #define PPP_IPV6        0x0057          /* Internet Protocol Version 6 */
 137 #define PPP_LCP         0xc021          /* Link Control Protocol */
 138 #define PPP_PAP         0xc023          /* Password Authentication Protocol */
 139 #define PPP_CHAP        0xc223          /* Challenge-Handshake Auth Protocol */
 140 #define PPP_IPCP        0x8021          /* Internet Protocol Control Protocol */
 141 #define PPP_IPV6CP      0x8057          /* IPv6 Control Protocol */
 142
 143 #define CONF_REQ        1               /* PPP configure request */
 144 #define CONF_ACK        2               /* PPP configure acknowledge */
 145 #define CONF_NAK        3               /* PPP configure negative ack */
 146 #define CONF_REJ        4               /* PPP configure reject */
 147 #define TERM_REQ        5               /* PPP terminate request */
 148 #define TERM_ACK        6               /* PPP terminate acknowledge */
 149 #define CODE_REJ        7               /* PPP code reject */
 150 #define PROTO_REJ       8               /* PPP protocol reject */
 151 #define ECHO_REQ        9               /* PPP echo request */
 152 #define ECHO_REPLY      10              /* PPP echo reply */
 153 #define DISC_REQ        11              /* PPP discard request */
 154
 155 #define LCP_OPT_MRU             1       /* maximum receive unit */
 156 #define LCP_OPT_ASYNC_MAP       2       /* async control character map */
 157 #define LCP_OPT_AUTH_PROTO      3       /* authentication protocol */
 158 #define LCP_OPT_QUAL_PROTO      4       /* quality protocol */
 159 #define LCP_OPT_MAGIC           5       /* magic number */
 160 #define LCP_OPT_RESERVED        6       /* reserved */
 161 #define LCP_OPT_PROTO_COMP      7       /* protocol field compression */
 162 #define LCP_OPT_ADDR_COMP       8       /* address/control field compression */
 163
 164 #define IPCP_OPT_ADDRESSES      1       /* both IP addresses; deprecated */
 165 #define IPCP_OPT_COMPRESSION    2       /* IP compression protocol (VJ) */
 166 #define IPCP_OPT_ADDRESS        3       /* local IP address */
 167
 168 #define IPV6CP_OPT_IFID 1       /* interface identifier */
 169 #define IPV6CP_OPT_COMPRESSION  2       /* IPv6 compression protocol */
 170
 171 #define IPCP_COMP_VJ            0x2d    /* Code for VJ compression */
 172
 173 #define PAP_REQ                 1       /* PAP name/password request */
 174 #define PAP_ACK                 2       /* PAP acknowledge */
 175 #define PAP_NAK                 3       /* PAP fail */
 176
 177 #define CHAP_CHALLENGE          1       /* CHAP challenge request */
 178 #define CHAP_RESPONSE           2       /* CHAP challenge response */
 179 #define CHAP_SUCCESS            3       /* CHAP response ok */
 180 #define CHAP_FAILURE            4       /* CHAP response failed */
 181
 182 #define CHAP_MD5                5       /* hash algorithm - MD5 */
 183
 184 #define CISCO_MULTICAST         0x8f    /* Cisco multicast address */
 185 #define CISCO_UNICAST           0x0f    /* Cisco unicast address */
 186 #define CISCO_KEEPALIVE         0x8035  /* Cisco keepalive protocol */
 187 #define CISCO_ADDR_REQ          0       /* Cisco address request */
 188 #define CISCO_ADDR_REPLY        1       /* Cisco address reply */
 189 #define CISCO_KEEPALIVE_REQ     2       /* Cisco keepalive request */
 190
 191 /* states are named and numbered according to RFC 1661 */
 192 #define STATE_INITIAL   0
 193 #define STATE_STARTING  1
 194 #define STATE_CLOSED    2
 195 #define STATE_STOPPED   3
 196 #define STATE_CLOSING   4
 197 #define STATE_STOPPING  5
 198 #define STATE_REQ_SENT  6
 199 #define STATE_ACK_RCVD  7
 200 #define STATE_ACK_SENT  8
 201 #define STATE_OPENED    9
 202
 203 struct ppp_header {
 204         u_char address;
 205         u_char control;
 206         u_short protocol;
 207 } __attribute__((__packed__));
 208 #define PPP_HEADER_LEN          sizeof (struct ppp_header)
 209
 210 struct lcp_header {
 211         u_char type;
 212         u_char ident;
 213         u_short len;
 214 } __attribute__((__packed__));
 215 #define LCP_HEADER_LEN          sizeof (struct lcp_header)
 216
 217 struct cisco_packet {
 218         u_long type;
 219         u_long par1;
 220         u_long par2;
 221         u_short rel;
 222         u_short time0;
 223         u_short time1;
 224 } __attribute__((__packed__));
 225 #define CISCO_PACKET_LEN        sizeof (struct cisco_packet)
 226
 227 /*
 228  * We follow the spelling and capitalization of RFC 1661 here, to make
 229  * it easier comparing with the standard.  Please refer to this RFC in
 230  * case you can't make sense out of these abbreviation; it will also
 231  * explain the semantics related to the various events and actions.
 232  */
 233 struct cp {
 234         u_short proto;          /* PPP control protocol number */
 235         u_char protoidx;        /* index into state table in struct sppp */
 236         u_char flags;
 237 #define CP_LCP          0x01    /* this is the LCP */
 238 #define CP_AUTH         0x02    /* this is an authentication protocol */
 239 #define CP_NCP          0x04    /* this is a NCP */
 240 #define CP_QUAL         0x08    /* this is a quality reporting protocol */
 241         const char *name;       /* name of this control protocol */
 242         /* event handlers */
 243         void    (*Up)(struct sppp *sp);
 244         void    (*Down)(struct sppp *sp);
 245         void    (*Open)(struct sppp *sp);
 246         void    (*Close)(struct sppp *sp);
 247         void    (*TO)(void *sp);
 248         int     (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
 249         void    (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
 250         void    (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
 251         /* actions */
 252         void    (*tlu)(struct sppp *sp);
 253         void    (*tld)(struct sppp *sp);
 254         void    (*tls)(struct sppp *sp);
 255         void    (*tlf)(struct sppp *sp);
 256         void    (*scr)(struct sppp *sp);
 257 };
 258
 259 static struct sppp *spppq;
 260 #if defined(__DragonFly__)
 261 static struct callout keepalive_timeout;
 262 #endif
 263
 264 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 && !defined(__DragonFly__)
 265 #define SPP_FMT         "%s%d: "
 266 #define SPP_ARGS(ifp)   (ifp)->if_name, (ifp)->if_unit
 267 #else
 268 #define SPP_FMT         "%s: "
 269 #define SPP_ARGS(ifp)   (ifp)->if_xname
 270 #endif
 271
 272 #ifdef INET
 273 /*
 274  * The following disgusting hack gets around the problem that IP TOS
 275  * can't be set yet.  We want to put "interactive" traffic on a high
 276  * priority queue.  To decide if traffic is interactive, we check that
 277  * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
 278  *
 279  * XXX is this really still necessary?  - joerg -
 280  */
 281 static u_short interactive_ports[8] = {
 282         0,      513,    0,      0,
 283         0,      21,     0,      23,
 284 };
 285 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
 286 #endif
 287
 288 /* almost every function needs these */
 289 #define STDDCL                                                  \
 290         struct ifnet *ifp = &sp->pp_if;                         \
 291         int debug = ifp->if_flags & IFF_DEBUG
 292
 293 static int sppp_output(struct ifnet *ifp, struct mbuf *m,
 294                        struct sockaddr *dst, struct rtentry *rt);
 295
 296 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
 297 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
 298
 299 static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
 300                           struct mbuf *m);
 301 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
 302                          u_char ident, u_short len, void *data);
 303 /* static void sppp_cp_timeout(void *arg); */
 304 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
 305                                  int newstate);
 306 static void sppp_auth_send(const struct cp *cp,
 307                            struct sppp *sp, unsigned int type, unsigned int id,
 308                            ...);
 309
 310 static void sppp_up_event(const struct cp *cp, struct sppp *sp);
 311 static void sppp_down_event(const struct cp *cp, struct sppp *sp);
 312 static void sppp_open_event(const struct cp *cp, struct sppp *sp);
 313 static void sppp_close_event(const struct cp *cp, struct sppp *sp);
 314 static void sppp_to_event(const struct cp *cp, struct sppp *sp);
 315
 316 static void sppp_null(struct sppp *sp);
 317
 318 static void sppp_lcp_init(struct sppp *sp);
 319 static void sppp_lcp_up(struct sppp *sp);
 320 static void sppp_lcp_down(struct sppp *sp);
 321 static void sppp_lcp_open(struct sppp *sp);
 322 static void sppp_lcp_close(struct sppp *sp);
 323 static void sppp_lcp_TO(void *sp);
 324 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 325 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 326 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 327 static void sppp_lcp_tlu(struct sppp *sp);
 328 static void sppp_lcp_tld(struct sppp *sp);
 329 static void sppp_lcp_tls(struct sppp *sp);
 330 static void sppp_lcp_tlf(struct sppp *sp);
 331 static void sppp_lcp_scr(struct sppp *sp);
 332 static void sppp_lcp_check_and_close(struct sppp *sp);
 333 static int sppp_ncp_check(struct sppp *sp);
 334
 335 static void sppp_ipcp_init(struct sppp *sp);
 336 static void sppp_ipcp_up(struct sppp *sp);
 337 static void sppp_ipcp_down(struct sppp *sp);
 338 static void sppp_ipcp_open(struct sppp *sp);
 339 static void sppp_ipcp_close(struct sppp *sp);
 340 static void sppp_ipcp_TO(void *sp);
 341 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 342 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 343 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 344 static void sppp_ipcp_tlu(struct sppp *sp);
 345 static void sppp_ipcp_tld(struct sppp *sp);
 346 static void sppp_ipcp_tls(struct sppp *sp);
 347 static void sppp_ipcp_tlf(struct sppp *sp);
 348 static void sppp_ipcp_scr(struct sppp *sp);
 349
 350 static void sppp_ipv6cp_init(struct sppp *sp);
 351 static void sppp_ipv6cp_up(struct sppp *sp);
 352 static void sppp_ipv6cp_down(struct sppp *sp);
 353 static void sppp_ipv6cp_open(struct sppp *sp);
 354 static void sppp_ipv6cp_close(struct sppp *sp);
 355 static void sppp_ipv6cp_TO(void *sp);
 356 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 357 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 358 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 359 static void sppp_ipv6cp_tlu(struct sppp *sp);
 360 static void sppp_ipv6cp_tld(struct sppp *sp);
 361 static void sppp_ipv6cp_tls(struct sppp *sp);
 362 static void sppp_ipv6cp_tlf(struct sppp *sp);
 363 static void sppp_ipv6cp_scr(struct sppp *sp);
 364
 365 static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
 366 static void sppp_pap_init(struct sppp *sp);
 367 static void sppp_pap_open(struct sppp *sp);
 368 static void sppp_pap_close(struct sppp *sp);
 369 static void sppp_pap_TO(void *sp);
 370 static void sppp_pap_my_TO(void *sp);
 371 static void sppp_pap_tlu(struct sppp *sp);
 372 static void sppp_pap_tld(struct sppp *sp);
 373 static void sppp_pap_scr(struct sppp *sp);
 374
 375 static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
 376 static void sppp_chap_init(struct sppp *sp);
 377 static void sppp_chap_open(struct sppp *sp);
 378 static void sppp_chap_close(struct sppp *sp);
 379 static void sppp_chap_TO(void *sp);
 380 static void sppp_chap_tlu(struct sppp *sp);
 381 static void sppp_chap_tld(struct sppp *sp);
 382 static void sppp_chap_scr(struct sppp *sp);
 383
 384 static const char *sppp_auth_type_name(u_short proto, u_char type);
 385 static const char *sppp_cp_type_name(u_char type);
 386 static const char *sppp_dotted_quad(u_long addr);
 387 static const char *sppp_ipcp_opt_name(u_char opt);
 388 #ifdef INET6
 389 static const char *sppp_ipv6cp_opt_name(u_char opt);
 390 #endif
 391 static const char *sppp_lcp_opt_name(u_char opt);
 392 static const char *sppp_phase_name(enum ppp_phase phase);
 393 static const char *sppp_proto_name(u_short proto);
 394 static const char *sppp_state_name(int state);
 395 static int sppp_params(struct sppp *sp, u_long cmd, void *data);
 396 static int sppp_strnlen(u_char *p, int max);
 397 static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst,
 398                               u_long *srcmask);
 399 static void sppp_keepalive(void *dummy);
 400 static void sppp_phase_network(struct sppp *sp);
 401 static void sppp_print_bytes(const u_char *p, u_short len);
 402 static void sppp_print_string(const char *p, u_short len);
 403 static void sppp_qflush(struct ifqueue *ifq);
 404 static void sppp_set_ip_addr(struct sppp *sp, u_long src);
 405 #ifdef INET6
 406 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src,
 407                                struct in6_addr *dst, struct in6_addr *srcmask);
 408 #ifdef IPV6CP_MYIFID_DYN
 409 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src);
 410 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src);
 411 #endif
 412 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src);
 413 #endif
 414
 415 /* our control protocol descriptors */
 416 static const struct cp lcp = {
 417         PPP_LCP, IDX_LCP, CP_LCP, "lcp",
 418         sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
 419         sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
 420         sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
 421         sppp_lcp_scr
 422 };
 423
 424 static const struct cp ipcp = {
 425         PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp",
 426         sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
 427         sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
 428         sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
 429         sppp_ipcp_scr
 430 };
 431
 432 static const struct cp ipv6cp = {
 433         PPP_IPV6CP, IDX_IPV6CP,
 434 #ifdef INET6    /*don't run IPv6CP if there's no IPv6 support*/
 435         CP_NCP,
 436 #else
 437         0,
 438 #endif
 439         "ipv6cp",
 440         sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close,
 441         sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak,
 442         sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf,
 443         sppp_ipv6cp_scr
 444 };
 445
 446 static const struct cp pap = {
 447         PPP_PAP, IDX_PAP, CP_AUTH, "pap",
 448         sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
 449         sppp_pap_TO, 0, 0, 0,
 450         sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
 451         sppp_pap_scr
 452 };
 453
 454 static const struct cp chap = {
 455         PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
 456         sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
 457         sppp_chap_TO, 0, 0, 0,
 458         sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
 459         sppp_chap_scr
 460 };
 461
 462 static const struct cp *cps[IDX_COUNT] = {
 463         &lcp,                   /* IDX_LCP */
 464         &ipcp,                  /* IDX_IPCP */
 465         &ipv6cp,                /* IDX_IPV6CP */
 466         &pap,                   /* IDX_PAP */
 467         &chap,                  /* IDX_CHAP */
 468 };
 469
 470 static int
 471 sppp_modevent(module_t mod, int type, void *unused)
 472 {
 473         switch (type) {
 474         case MOD_LOAD:
 475                 break;
 476         case MOD_UNLOAD:
 477                 return EACCES;
 478                 break;
 479         default:
 480                 break;
 481         }
 482         return 0;
 483 }
 484 static moduledata_t spppmod = {
 485         "sppp",
 486         sppp_modevent,
 487         0
 488 };
 489 MODULE_VERSION(sppp, 1);
 490 DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY);
 491
 492 /*
 493  * Exported functions, comprising our interface to the lower layer.
 494  */
 495
 496 /*
 497  * Process the received packet.
 498  */
 499 void
 500 sppp_input(struct ifnet *ifp, struct mbuf *m)
 501 {
 502         struct ppp_header *h;
 503         int isr = -1;
 504         struct sppp *sp = (struct sppp *)ifp;
 505         u_char *iphdr;
 506         int hlen, vjlen, do_account = 0;
 507         int debug = ifp->if_flags & IFF_DEBUG;
 508
 509         if (ifp->if_flags & IFF_UP)
 510                 /* Count received bytes, add FCS and one flag */
 511                 ifp->if_ibytes += m->m_pkthdr.len + 3;
 512
 513         if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
 514                 /* Too small packet, drop it. */
 515                 if (debug)
 516                         log(LOG_DEBUG,
 517                             SPP_FMT "input packet is too small, %d bytes\n",
 518                             SPP_ARGS(ifp), m->m_pkthdr.len);
 519           drop:
 520                 m_freem (m);
 521           drop2:
 522                 ++ifp->if_ierrors;
 523                 ++ifp->if_iqdrops;
 524                 return;
 525         }
 526
 527         /* Get PPP header. */
 528         h = mtod (m, struct ppp_header*);
 529         m_adj (m, PPP_HEADER_LEN);
 530
 531         switch (h->address) {
 532         case PPP_ALLSTATIONS:
 533                 if (h->control != PPP_UI)
 534                         goto invalid;
 535                 if (sp->pp_mode == IFF_CISCO) {
 536                         if (debug)
 537                                 log(LOG_DEBUG,
 538                                     SPP_FMT "PPP packet in Cisco mode "
 539                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 540                                     SPP_ARGS(ifp),
 541                                     h->address, h->control, ntohs(h->protocol));
 542                         goto drop;
 543                 }
 544                 switch (ntohs (h->protocol)) {
 545                 default:
 546                         if (debug)
 547                                 log(LOG_DEBUG,
 548                                     SPP_FMT "rejecting protocol "
 549                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 550                                     SPP_ARGS(ifp),
 551                                     h->address, h->control, ntohs(h->protocol));
 552                         if (sp->state[IDX_LCP] == STATE_OPENED)
 553                                 sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
 554                                         ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2,
 555                                         &h->protocol);
 556                         ++ifp->if_noproto;
 557                         goto drop;
 558                 case PPP_LCP:
 559                         sppp_cp_input(&lcp, sp, m);
 560                         m_freem (m);
 561                         return;
 562                 case PPP_PAP:
 563                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
 564                                 sppp_pap_input(sp, m);
 565                         m_freem (m);
 566                         return;
 567                 case PPP_CHAP:
 568                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
 569                                 sppp_chap_input(sp, m);
 570                         m_freem (m);
 571                         return;
 572 #ifdef INET
 573                 case PPP_IPCP:
 574                         if (sp->pp_phase == PHASE_NETWORK)
 575                                 sppp_cp_input(&ipcp, sp, m);
 576                         m_freem (m);
 577                         return;
 578                 case PPP_IP:
 579                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 580                                 isr = NETISR_IP;
 581                         }
 582                         do_account++;
 583                         break;
 584                 case PPP_VJ_COMP:
 585                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 586                                 if ((vjlen =
 587                                      sl_uncompress_tcp_core(mtod(m, u_char *),
 588                                                             m->m_len, m->m_len,
 589                                                             TYPE_COMPRESSED_TCP,
 590                                                             sp->pp_comp,
 591                                                             &iphdr, &hlen)) <= 0) {
 592                                         if (debug)
 593                                                 log(LOG_INFO,
 594                             SPP_FMT "VJ uncompress failed on compressed packet\n",
 595                                                     SPP_ARGS(ifp));
 596                                         goto drop;
 597                                 }
 598
 599                                 /*
 600                                  * Trim the VJ header off the packet, and prepend
 601                                  * the uncompressed IP header (which will usually
 602                                  * end up in two chained mbufs since there's not
 603                                  * enough leading space in the existing mbuf).
 604                                  */
 605                                 m_adj(m, vjlen);
 606                                 M_PREPEND(m, hlen, MB_DONTWAIT);
 607                                 if (m == NULL)
 608                                         goto drop2;
 609                                 bcopy(iphdr, mtod(m, u_char *), hlen);
 610
 611                                 isr = NETISR_IP;
 612                         }
 613                         do_account++;
 614                         break;
 615                 case PPP_VJ_UCOMP:
 616                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 617                                 if (sl_uncompress_tcp_core(mtod(m, u_char *),
 618                                                            m->m_len, m->m_len,
 619                                                            TYPE_UNCOMPRESSED_TCP,
 620                                                            sp->pp_comp,
 621                                                            &iphdr, &hlen) != 0) {
 622                                         if (debug)
 623                                                 log(LOG_INFO,
 624                             SPP_FMT "VJ uncompress failed on uncompressed packet\n",
 625                                                     SPP_ARGS(ifp));
 626                                         goto drop;
 627                                 }
 628                                 isr = NETISR_IP;
 629                         }
 630                         do_account++;
 631                         break;
 632 #endif
 633 #ifdef INET6
 634                 case PPP_IPV6CP:
 635                         if (sp->pp_phase == PHASE_NETWORK)
 636                             sppp_cp_input(&ipv6cp, sp, m);
 637                         m_freem (m);
 638                         return;
 639
 640                 case PPP_IPV6:
 641                         if (sp->state[IDX_IPV6CP] == STATE_OPENED) {
 642                                 isr = NETISR_IPV6;
 643                         }
 644                         do_account++;
 645                         break;
 646 #endif
 647 #ifdef IPX
 648                 case PPP_IPX:
 649                         /* IPX IPXCP not implemented yet */
 650                         if (sp->pp_phase == PHASE_NETWORK) {
 651                                 isr = NETISR_IPX;
 652                         }
 653                         do_account++;
 654                         break;
 655 #endif
 656 #ifdef NS
 657                 case PPP_XNS:
 658                         /* XNS IDPCP not implemented yet */
 659                         if (sp->pp_phase == PHASE_NETWORK) {
 660                                 isr = NETISR_NS;
 661                         }
 662                         do_account++;
 663                         break;
 664 #endif
 665                 }
 666                 break;
 667         case CISCO_MULTICAST:
 668         case CISCO_UNICAST:
 669                 /* Don't check the control field here (RFC 1547). */
 670                 if (sp->pp_mode != IFF_CISCO) {
 671                         if (debug)
 672                                 log(LOG_DEBUG,
 673                                     SPP_FMT "Cisco packet in PPP mode "
 674                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 675                                     SPP_ARGS(ifp),
 676                                     h->address, h->control, ntohs(h->protocol));
 677                         goto drop;
 678                 }
 679                 switch (ntohs (h->protocol)) {
 680                 default:
 681                         ++ifp->if_noproto;
 682                         goto invalid;
 683                 case CISCO_KEEPALIVE:
 684                         sppp_cisco_input ((struct sppp*) ifp, m);
 685                         m_freem (m);
 686                         return;
 687 #ifdef INET
 688                 case ETHERTYPE_IP:
 689                         isr = NETISR_IP;
 690                         do_account++;
 691                         break;
 692 #endif
 693 #ifdef INET6
 694                 case ETHERTYPE_IPV6:
 695                         isr = NETISR_IPV6;
 696                         do_account++;
 697                         break;
 698 #endif
 699 #ifdef IPX
 700                 case ETHERTYPE_IPX:
 701                         isr = NETISR_IPX;
 702                         do_account++;
 703                         break;
 704 #endif
 705 #ifdef NS
 706                 case ETHERTYPE_NS:
 707                         isr = NETISR_NS
 708                         do_account++;
 709                         break;
 710 #endif
 711                 }
 712                 break;
 713         default:        /* Invalid PPP packet. */
 714           invalid:
 715                 if (debug)
 716                         log(LOG_DEBUG,
 717                             SPP_FMT "invalid input packet "
 718                             "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 719                             SPP_ARGS(ifp),
 720                             h->address, h->control, ntohs(h->protocol));
 721                 goto drop;
 722         }
 723
 724         if (! (ifp->if_flags & IFF_UP) || isr < 0)
 725                 goto drop;
 726
 727         /* Check queue. */
 728
 729         netisr_dispatch(isr, m);
 730         if (do_account)
 731                 /*
 732                  * Do only account for network packets, not for control
 733                  * packets.  This is used by some subsystems to detect
 734                  * idle lines.
 735                  */
 736                 sp->pp_last_recv = time_second;
 737 }
 738
 739 /*
 740  * Enqueue transmit packet.
 741  */
 742 static int
 743 sppp_output(struct ifnet *ifp, struct mbuf *m,
 744             struct sockaddr *dst, struct rtentry *rt)
 745 {
 746         struct sppp *sp = (struct sppp*) ifp;
 747         struct ppp_header *h;
 748         struct ifqueue *ifq = NULL;
 749         int s, rv = 0;
 750         int ipproto = PPP_IP;
 751         int debug = ifp->if_flags & IFF_DEBUG;
 752
 753         s = splimp();
 754
 755         if ((ifp->if_flags & IFF_UP) == 0 ||
 756             (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) {
 757 #ifdef INET6
 758           drop:
 759 #endif
 760                 m_freem (m);
 761                 splx (s);
 762                 return (ENETDOWN);
 763         }
 764
 765         if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) {
 766 #ifdef INET6
 767                 /*
 768                  * XXX
 769                  *
 770                  * Hack to prevent the initialization-time generated
 771                  * IPv6 multicast packet to erroneously cause a
 772                  * dialout event in case IPv6 has been
 773                  * administratively disabled on that interface.
 774                  */
 775                 if (dst->sa_family == AF_INET6 &&
 776                     !(sp->confflags & CONF_ENABLE_IPV6))
 777                         goto drop;
 778 #endif
 779                 /*
 780                  * Interface is not yet running, but auto-dial.  Need
 781                  * to start LCP for it.
 782                  */
 783                 ifp->if_flags |= IFF_RUNNING;
 784                 splx(s);
 785                 lcp.Open(sp);
 786                 s = splimp();
 787         }
 788
 789         ifq = &ifp->if_snd;
 790 #ifdef INET
 791         if (dst->sa_family == AF_INET) {
 792                 /* XXX Check mbuf length here? */
 793                 struct ip *ip = mtod (m, struct ip*);
 794                 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
 795
 796                 /*
 797                  * When using dynamic local IP address assignment by using
 798                  * 0.0.0.0 as a local address, the first TCP session will
 799                  * not connect because the local TCP checksum is computed
 800                  * using 0.0.0.0 which will later become our real IP address
 801                  * so the TCP checksum computed at the remote end will
 802                  * become invalid. So we
 803                  * - don't let packets with src ip addr 0 thru
 804                  * - we flag TCP packets with src ip 0 as an error
 805                  */
 806
 807                 if(ip->ip_src.s_addr == INADDR_ANY)     /* -hm */
 808                 {
 809                         m_freem(m);
 810                         splx(s);
 811                         if(ip->ip_p == IPPROTO_TCP)
 812                                 return(EADDRNOTAVAIL);
 813                         else
 814                                 return(0);
 815                 }
 816
 817                 /*
 818                  * Put low delay, telnet, rlogin and ftp control packets
 819                  * in front of the queue.
 820                  */
 821                 if (IF_QFULL (&sp->pp_fastq))
 822                         ;
 823                 else if (ip->ip_tos & IPTOS_LOWDELAY)
 824                         ifq = &sp->pp_fastq;
 825                 else if (m->m_len < sizeof *ip + sizeof *tcp)
 826                         ;
 827                 else if (ip->ip_p != IPPROTO_TCP)
 828                         ;
 829                 else if (INTERACTIVE (ntohs (tcp->th_sport)))
 830                         ifq = &sp->pp_fastq;
 831                 else if (INTERACTIVE (ntohs (tcp->th_dport)))
 832                         ifq = &sp->pp_fastq;
 833
 834                 /*
 835                  * Do IP Header compression
 836                  */
 837                 if (sp->pp_mode != IFF_CISCO && (sp->ipcp.flags & IPCP_VJ) &&
 838                     ip->ip_p == IPPROTO_TCP)
 839                         switch (sl_compress_tcp(m, ip, sp->pp_comp,
 840                                                 sp->ipcp.compress_cid)) {
 841                         case TYPE_COMPRESSED_TCP:
 842                                 ipproto = PPP_VJ_COMP;
 843                                 break;
 844                         case TYPE_UNCOMPRESSED_TCP:
 845                                 ipproto = PPP_VJ_UCOMP;
 846                                 break;
 847                         case TYPE_IP:
 848                                 ipproto = PPP_IP;
 849                                 break;
 850                         default:
 851                                 m_freem(m);
 852                                 splx(s);
 853                                 return (EINVAL);
 854                         }
 855         }
 856 #endif
 857
 858 #ifdef INET6
 859         if (dst->sa_family == AF_INET6) {
 860                 /* XXX do something tricky here? */
 861         }
 862 #endif
 863
 864         /*
 865          * Prepend general data packet PPP header. For now, IP only.
 866          */
 867         M_PREPEND (m, PPP_HEADER_LEN, MB_DONTWAIT);
 868         if (! m) {
 869                 if (debug)
 870                         log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
 871                                 SPP_ARGS(ifp));
 872                 ++ifp->if_oerrors;
 873                 splx (s);
 874                 return (ENOBUFS);
 875         }
 876         /*
 877          * May want to check size of packet
 878          * (albeit due to the implementation it's always enough)
 879          */
 880         h = mtod (m, struct ppp_header*);
 881         if (sp->pp_mode == IFF_CISCO) {
 882                 h->address = CISCO_UNICAST;        /* unicast address */
 883                 h->control = 0;
 884         } else {
 885                 h->address = PPP_ALLSTATIONS;        /* broadcast address */
 886                 h->control = PPP_UI;                 /* Unnumbered Info */
 887         }
 888
 889         switch (dst->sa_family) {
 890 #ifdef INET
 891         case AF_INET:   /* Internet Protocol */
 892                 if (sp->pp_mode == IFF_CISCO)
 893                         h->protocol = htons (ETHERTYPE_IP);
 894                 else {
 895                         /*
 896                          * Don't choke with an ENETDOWN early.  It's
 897                          * possible that we just started dialing out,
 898                          * so don't drop the packet immediately.  If
 899                          * we notice that we run out of buffer space
 900                          * below, we will however remember that we are
 901                          * not ready to carry IP packets, and return
 902                          * ENETDOWN, as opposed to ENOBUFS.
 903                          */
 904                         h->protocol = htons(ipproto);
 905                         if (sp->state[IDX_IPCP] != STATE_OPENED)
 906                                 rv = ENETDOWN;
 907                 }
 908                 break;
 909 #endif
 910 #ifdef INET6
 911         case AF_INET6:   /* Internet Protocol */
 912                 if (sp->pp_mode == IFF_CISCO)
 913                         h->protocol = htons (ETHERTYPE_IPV6);
 914                 else {
 915                         /*
 916                          * Don't choke with an ENETDOWN early.  It's
 917                          * possible that we just started dialing out,
 918                          * so don't drop the packet immediately.  If
 919                          * we notice that we run out of buffer space
 920                          * below, we will however remember that we are
 921                          * not ready to carry IP packets, and return
 922                          * ENETDOWN, as opposed to ENOBUFS.
 923                          */
 924                         h->protocol = htons(PPP_IPV6);
 925                         if (sp->state[IDX_IPV6CP] != STATE_OPENED)
 926                                 rv = ENETDOWN;
 927                 }
 928                 break;
 929 #endif
 930 #ifdef NS
 931         case AF_NS:     /* Xerox NS Protocol */
 932                 h->protocol = htons (sp->pp_mode == IFF_CISCO ?
 933                         ETHERTYPE_NS : PPP_XNS);
 934                 break;
 935 #endif
 936 #ifdef IPX
 937         case AF_IPX:     /* Novell IPX Protocol */
 938                 h->protocol = htons (sp->pp_mode == IFF_CISCO ?
 939                         ETHERTYPE_IPX : PPP_IPX);
 940                 break;
 941 #endif
 942         default:
 943                 m_freem (m);
 944                 ++ifp->if_oerrors;
 945                 splx (s);
 946                 return (EAFNOSUPPORT);
 947         }
 948
 949         /*
 950          * Queue message on interface, and start output if interface
 951          * not yet active.
 952          */
 953         if (IF_QFULL (ifq)) {
 954                 IF_DROP (&ifp->if_snd);
 955                 m_freem (m);
 956                 ++ifp->if_oerrors;
 957                 splx (s);
 958                 return (rv? rv: ENOBUFS);
 959         }
 960         IF_ENQUEUE (ifq, m);
 961         if (! (ifp->if_flags & IFF_OACTIVE))
 962                 (*ifp->if_start) (ifp);
 963
 964         /*
 965          * Count output packets and bytes.
 966          * The packet length includes header, FCS and 1 flag,
 967          * according to RFC 1333.
 968          */
 969         ifp->if_obytes += m->m_pkthdr.len + 3;
 970         splx (s);
 971         /*
 972          * Unlike in sppp_input(), we can always bump the timestamp
 973          * here since sppp_output() is only called on behalf of
 974          * network-layer traffic; control-layer traffic is handled
 975          * by sppp_cp_send().
 976          */
 977         sp->pp_last_sent = time_second;
 978         return (0);
 979 }
 980
 981 void
 982 sppp_attach(struct ifnet *ifp)
 983 {
 984         struct sppp *sp = (struct sppp*) ifp;
 985
 986         /* Initialize keepalive handler. */
 987         if (!spppq) {
 988                 callout_reset(&keepalive_timeout, hz * 10,
 989                                 sppp_keepalive, NULL);
 990         }
 991         /* Insert new entry into the keepalive list. */
 992         sp->pp_next = spppq;
 993         spppq = sp;
 994
 995         sp->pp_if.if_mtu = PP_MTU;
 996         sp->pp_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
 997         sp->pp_if.if_type = IFT_PPP;
 998         sp->pp_if.if_output = sppp_output;
 999 #if 0
1000         sp->pp_flags = PP_KEEPALIVE;
1001 #endif
1002         sp->pp_if.if_snd.ifq_maxlen = 32;
1003         sp->pp_fastq.ifq_maxlen = 32;
1004         sp->pp_cpq.ifq_maxlen = 20;
1005         sp->pp_loopcnt = 0;
1006         sp->pp_alivecnt = 0;
1007         bzero(&sp->pp_seq[0], sizeof(sp->pp_seq));
1008         bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq));
1009         sp->pp_phase = PHASE_DEAD;
1010         sp->pp_up = lcp.Up;
1011         sp->pp_down = lcp.Down;
1012         sp->pp_last_recv = sp->pp_last_sent = time_second;
1013         sp->confflags = 0;
1014 #ifdef INET
1015         sp->confflags |= CONF_ENABLE_VJ;
1016 #endif
1017 #ifdef INET6
1018         sp->confflags |= CONF_ENABLE_IPV6;
1019 #endif
1020         sp->pp_comp = malloc(sizeof(struct slcompress), M_TEMP, M_WAITOK);
1021         sl_compress_init(sp->pp_comp, -1);
1022         sppp_lcp_init(sp);
1023         sppp_ipcp_init(sp);
1024         sppp_ipv6cp_init(sp);
1025         sppp_pap_init(sp);
1026         sppp_chap_init(sp);
1027 }
1028
1029 void
1030 sppp_detach(struct ifnet *ifp)
1031 {
1032         struct sppp **q, *p, *sp = (struct sppp*) ifp;
1033         int i;
1034
1035         /* Remove the entry from the keepalive list. */
1036         for (q = &spppq; (p = *q); q = &p->pp_next)
1037                 if (p == sp) {
1038                         *q = p->pp_next;
1039                         break;
1040                 }
1041
1042         /* Stop keepalive handler. */
1043         if (!spppq)
1044                 callout_stop(&keepalive_timeout);
1045
1046         for (i = 0; i < IDX_COUNT; i++)
1047                 callout_stop(&sp->timeout[i]);
1048         callout_stop(&sp->pap_my_to);
1049 }
1050
1051 /*
1052  * Flush the interface output queue.
1053  */
1054 void
1055 sppp_flush(struct ifnet *ifp)
1056 {
1057         struct sppp *sp = (struct sppp*) ifp;
1058
1059         sppp_qflush (&sp->pp_if.if_snd);
1060         sppp_qflush (&sp->pp_fastq);
1061         sppp_qflush (&sp->pp_cpq);
1062 }
1063
1064 /*
1065  * Check if the output queue is empty.
1066  */
1067 int
1068 sppp_isempty(struct ifnet *ifp)
1069 {
1070         struct sppp *sp = (struct sppp*) ifp;
1071         int empty, s;
1072
1073         s = splimp();
1074         empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head &&
1075                 !sp->pp_if.if_snd.ifq_head;
1076         splx(s);
1077         return (empty);
1078 }
1079
1080 /*
1081  * Get next packet to send.
1082  */
1083 struct mbuf *
1084 sppp_dequeue(struct ifnet *ifp)
1085 {
1086         struct sppp *sp = (struct sppp*) ifp;
1087         struct mbuf *m;
1088         int s;
1089
1090         s = splimp();
1091         /*
1092          * Process only the control protocol queue until we have at
1093          * least one NCP open.
1094          *
1095          * Do always serve all three queues in Cisco mode.
1096          */
1097         IF_DEQUEUE(&sp->pp_cpq, m);
1098         if (m == NULL &&
1099             (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO)) {
1100                 IF_DEQUEUE(&sp->pp_fastq, m);
1101                 if (m == NULL)
1102                         IF_DEQUEUE (&sp->pp_if.if_snd, m);
1103         }
1104         splx(s);
1105         return m;
1106 }
1107
1108 /*
1109  * Pick the next packet, do not remove it from the queue.
1110  */
1111 struct mbuf *
1112 sppp_pick(struct ifnet *ifp)
1113 {
1114         struct sppp *sp = (struct sppp*)ifp;
1115         struct mbuf *m;
1116         int s;
1117
1118         s= splimp ();
1119
1120         m = sp->pp_cpq.ifq_head;
1121         if (m == NULL &&
1122             (sp->pp_phase == PHASE_NETWORK || sp->pp_mode == IFF_CISCO))
1123                 if ((m = sp->pp_fastq.ifq_head) == NULL)
1124                         m = sp->pp_if.if_snd.ifq_head;
1125         splx (s);
1126         return (m);
1127 }
1128
1129 /*
1130  * Process an ioctl request.  Called on low priority level.
1131  */
1132 int
1133 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
1134 {
1135         struct ifreq *ifr = (struct ifreq*) data;
1136         struct sppp *sp = (struct sppp*) ifp;
1137         int s, rv, going_up, going_down, newmode;
1138
1139         s = splimp();
1140         rv = 0;
1141         switch (cmd) {
1142         case SIOCAIFADDR:
1143         case SIOCSIFDSTADDR:
1144                 break;
1145
1146         case SIOCSIFADDR:
1147                 /* set the interface "up" when assigning an IP address */
1148                 ifp->if_flags |= IFF_UP;
1149                 /* fall through... */
1150
1151         case SIOCSIFFLAGS:
1152                 going_up = ifp->if_flags & IFF_UP &&
1153                         (ifp->if_flags & IFF_RUNNING) == 0;
1154                 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1155                         ifp->if_flags & IFF_RUNNING;
1156
1157                 newmode = ifp->if_flags & IFF_PASSIVE;
1158                 if (!newmode)
1159                         newmode = ifp->if_flags & IFF_AUTO;
1160                 if (!newmode)
1161                         newmode = ifp->if_flags & IFF_CISCO;
1162                 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
1163                 ifp->if_flags |= newmode;
1164
1165                 if (newmode != sp->pp_mode) {
1166                         going_down = 1;
1167                         if (!going_up)
1168                                 going_up = ifp->if_flags & IFF_RUNNING;
1169                 }
1170
1171                 if (going_down) {
1172                         if (sp->pp_mode != IFF_CISCO)
1173                                 lcp.Close(sp);
1174                         else if (sp->pp_tlf)
1175                                 (sp->pp_tlf)(sp);
1176                         sppp_flush(ifp);
1177                         ifp->if_flags &= ~IFF_RUNNING;
1178                         sp->pp_mode = newmode;
1179                 }
1180
1181                 if (going_up) {
1182                         if (sp->pp_mode != IFF_CISCO)
1183                                 lcp.Close(sp);
1184                         sp->pp_mode = newmode;
1185                         if (sp->pp_mode == 0) {
1186                                 ifp->if_flags |= IFF_RUNNING;
1187                                 lcp.Open(sp);
1188                         }
1189                         if (sp->pp_mode == IFF_CISCO) {
1190                                 if (sp->pp_tls)
1191                                         (sp->pp_tls)(sp);
1192                                 ifp->if_flags |= IFF_RUNNING;
1193                         }
1194                 }
1195
1196                 break;
1197
1198 #ifdef SIOCSIFMTU
1199 #ifndef ifr_mtu
1200 #define ifr_mtu ifr_metric
1201 #endif
1202         case SIOCSIFMTU:
1203                 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
1204                         return (EINVAL);
1205                 ifp->if_mtu = ifr->ifr_mtu;
1206                 break;
1207 #endif
1208 #ifdef SLIOCSETMTU
1209         case SLIOCSETMTU:
1210                 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
1211                         return (EINVAL);
1212                 ifp->if_mtu = *(short*)data;
1213                 break;
1214 #endif
1215 #ifdef SIOCGIFMTU
1216         case SIOCGIFMTU:
1217                 ifr->ifr_mtu = ifp->if_mtu;
1218                 break;
1219 #endif
1220 #ifdef SLIOCGETMTU
1221         case SLIOCGETMTU:
1222                 *(short*)data = ifp->if_mtu;
1223                 break;
1224 #endif
1225         case SIOCADDMULTI:
1226         case SIOCDELMULTI:
1227                 break;
1228
1229         case SIOCGIFGENERIC:
1230         case SIOCSIFGENERIC:
1231                 rv = sppp_params(sp, cmd, data);
1232                 break;
1233
1234         default:
1235                 rv = ENOTTY;
1236         }
1237         splx(s);
1238         return rv;
1239 }
1240
1241 /*
1242  * Cisco framing implementation.
1243  */
1244
1245 /*
1246  * Handle incoming Cisco keepalive protocol packets.
1247  */
1248 static void
1249 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1250 {
1251         STDDCL;
1252         struct cisco_packet *h;
1253         u_long me, mymask;
1254
1255         if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1256                 if (debug)
1257                         log(LOG_DEBUG,
1258                             SPP_FMT "cisco invalid packet length: %d bytes\n",
1259                             SPP_ARGS(ifp), m->m_pkthdr.len);
1260                 return;
1261         }
1262         h = mtod (m, struct cisco_packet*);
1263         if (debug)
1264                 log(LOG_DEBUG,
1265                     SPP_FMT "cisco input: %d bytes "
1266                     "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1267                     SPP_ARGS(ifp), m->m_pkthdr.len,
1268                     (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
1269                     (u_int)h->time0, (u_int)h->time1);
1270         switch (ntohl (h->type)) {
1271         default:
1272                 if (debug)
1273                         addlog(SPP_FMT "cisco unknown packet type: 0x%lx\n",
1274                                SPP_ARGS(ifp), (u_long)ntohl (h->type));
1275                 break;
1276         case CISCO_ADDR_REPLY:
1277                 /* Reply on address request, ignore */
1278                 break;
1279         case CISCO_KEEPALIVE_REQ:
1280                 sp->pp_alivecnt = 0;
1281                 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
1282                 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1283                         /* Local and remote sequence numbers are equal.
1284                          * Probably, the line is in loopback mode. */
1285                         if (sp->pp_loopcnt >= MAXALIVECNT) {
1286                                 printf (SPP_FMT "loopback\n",
1287                                         SPP_ARGS(ifp));
1288                                 sp->pp_loopcnt = 0;
1289                                 if (ifp->if_flags & IFF_UP) {
1290                                         if_down (ifp);
1291                                         sppp_qflush (&sp->pp_cpq);
1292                                 }
1293                         }
1294                         ++sp->pp_loopcnt;
1295
1296                         /* Generate new local sequence number */
1297 #if defined(__DragonFly__)
1298                         sp->pp_seq[IDX_LCP] = random();
1299 #else
1300                         sp->pp_seq[IDX_LCP] ^= time.tv_sec ^ time.tv_usec;
1301 #endif
1302                         break;
1303                 }
1304                 sp->pp_loopcnt = 0;
1305                 if (! (ifp->if_flags & IFF_UP) &&
1306                     (ifp->if_flags & IFF_RUNNING)) {
1307                         if_up(ifp);
1308                         printf (SPP_FMT "up\n", SPP_ARGS(ifp));
1309                 }
1310                 break;
1311         case CISCO_ADDR_REQ:
1312                 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1313                 if (me != 0L)
1314                         sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1315                 break;
1316         }
1317 }
1318
1319 /*
1320  * Send Cisco keepalive packet.
1321  */
1322 static void
1323 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1324 {
1325         STDDCL;
1326         struct ppp_header *h;
1327         struct cisco_packet *ch;
1328         struct mbuf *m;
1329 #if defined(__DragonFly__)
1330         struct timeval tv;
1331 #else
1332         u_long t = (time.tv_sec - boottime.tv_sec) * 1000;
1333 #endif
1334
1335 #if defined(__DragonFly__)
1336         getmicrouptime(&tv);
1337 #endif
1338
1339         MGETHDR (m, MB_DONTWAIT, MT_DATA);
1340         if (! m)
1341                 return;
1342         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1343         m->m_pkthdr.rcvif = 0;
1344
1345         h = mtod (m, struct ppp_header*);
1346         h->address = CISCO_MULTICAST;
1347         h->control = 0;
1348         h->protocol = htons (CISCO_KEEPALIVE);
1349
1350         ch = (struct cisco_packet*) (h + 1);
1351         ch->type = htonl (type);
1352         ch->par1 = htonl (par1);
1353         ch->par2 = htonl (par2);
1354         ch->rel = -1;
1355
1356 #if defined(__DragonFly__)
1357         ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1358         ch->time1 = htons ((u_short) tv.tv_sec);
1359 #else
1360         ch->time0 = htons ((u_short) (t >> 16));
1361         ch->time1 = htons ((u_short) t);
1362 #endif
1363
1364         if (debug)
1365                 log(LOG_DEBUG,
1366                     SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1367                         SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
1368                         (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1369
1370         if (IF_QFULL (&sp->pp_cpq)) {
1371                 IF_DROP (&sp->pp_fastq);
1372                 IF_DROP (&ifp->if_snd);
1373                 m_freem (m);
1374         } else
1375                 IF_ENQUEUE (&sp->pp_cpq, m);
1376         if (! (ifp->if_flags & IFF_OACTIVE))
1377                 (*ifp->if_start) (ifp);
1378         ifp->if_obytes += m->m_pkthdr.len + 3;
1379 }
1380
1381 /*
1382  * PPP protocol implementation.
1383  */
1384
1385 /*
1386  * Send PPP control protocol packet.
1387  */
1388 static void
1389 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1390              u_char ident, u_short len, void *data)
1391 {
1392         STDDCL;
1393         struct ppp_header *h;
1394         struct lcp_header *lh;
1395         struct mbuf *m;
1396
1397         if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1398                 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1399         MGETHDR (m, MB_DONTWAIT, MT_DATA);
1400         if (! m)
1401                 return;
1402         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1403         m->m_pkthdr.rcvif = 0;
1404
1405         h = mtod (m, struct ppp_header*);
1406         h->address = PPP_ALLSTATIONS;        /* broadcast address */
1407         h->control = PPP_UI;                 /* Unnumbered Info */
1408         h->protocol = htons (proto);         /* Link Control Protocol */
1409
1410         lh = (struct lcp_header*) (h + 1);
1411         lh->type = type;
1412         lh->ident = ident;
1413         lh->len = htons (LCP_HEADER_LEN + len);
1414         if (len)
1415                 bcopy (data, lh+1, len);
1416
1417         if (debug) {
1418                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1419                     SPP_ARGS(ifp),
1420                     sppp_proto_name(proto),
1421                     sppp_cp_type_name (lh->type), lh->ident,
1422                     ntohs (lh->len));
1423                 sppp_print_bytes ((u_char*) (lh+1), len);
1424                 addlog(">\n");
1425         }
1426         if (IF_QFULL (&sp->pp_cpq)) {
1427                 IF_DROP (&sp->pp_fastq);
1428                 IF_DROP (&ifp->if_snd);
1429                 m_freem (m);
1430                 ++ifp->if_oerrors;
1431         } else
1432                 IF_ENQUEUE (&sp->pp_cpq, m);
1433         if (! (ifp->if_flags & IFF_OACTIVE))
1434                 (*ifp->if_start) (ifp);
1435         ifp->if_obytes += m->m_pkthdr.len + 3;
1436 }
1437
1438 /*
1439  * Handle incoming PPP control protocol packets.
1440  */
1441 static void
1442 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1443 {
1444         STDDCL;
1445         struct lcp_header *h;
1446         int len = m->m_pkthdr.len;
1447         int rv;
1448         u_char *p;
1449
1450         if (len < 4) {
1451                 if (debug)
1452                         log(LOG_DEBUG,
1453                             SPP_FMT "%s invalid packet length: %d bytes\n",
1454                             SPP_ARGS(ifp), cp->name, len);
1455                 return;
1456         }
1457         h = mtod (m, struct lcp_header*);
1458         if (debug) {
1459                 log(LOG_DEBUG,
1460                     SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1461                     SPP_ARGS(ifp), cp->name,
1462                     sppp_state_name(sp->state[cp->protoidx]),
1463                     sppp_cp_type_name (h->type), h->ident, ntohs (h->len));
1464                 sppp_print_bytes ((u_char*) (h+1), len-4);
1465                 addlog(">\n");
1466         }
1467         if (len > ntohs (h->len))
1468                 len = ntohs (h->len);
1469         p = (u_char *)(h + 1);
1470         switch (h->type) {
1471         case CONF_REQ:
1472                 if (len < 4) {
1473                         if (debug)
1474                                 addlog(SPP_FMT "%s invalid conf-req length %d\n",
1475                                        SPP_ARGS(ifp), cp->name,
1476                                        len);
1477                         ++ifp->if_ierrors;
1478                         break;
1479                 }
1480                 /* handle states where RCR doesn't get a SCA/SCN */
1481                 switch (sp->state[cp->protoidx]) {
1482                 case STATE_CLOSING:
1483                 case STATE_STOPPING:
1484                         return;
1485                 case STATE_CLOSED:
1486                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1487                                      0, 0);
1488                         return;
1489                 }
1490                 rv = (cp->RCR)(sp, h, len);
1491                 switch (sp->state[cp->protoidx]) {
1492                 case STATE_OPENED:
1493                         (cp->tld)(sp);
1494                         (cp->scr)(sp);
1495                         /* fall through... */
1496                 case STATE_ACK_SENT:
1497                 case STATE_REQ_SENT:
1498                         /*
1499                          * sppp_cp_change_state() have the side effect of
1500                          * restarting the timeouts. We want to avoid that
1501                          * if the state don't change, otherwise we won't
1502                          * ever timeout and resend a configuration request
1503                          * that got lost.
1504                          */
1505                         if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
1506                             STATE_REQ_SENT))
1507                                 break;
1508                         sppp_cp_change_state(cp, sp, rv?
1509                                              STATE_ACK_SENT: STATE_REQ_SENT);
1510                         break;
1511                 case STATE_STOPPED:
1512                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1513                         (cp->scr)(sp);
1514                         sppp_cp_change_state(cp, sp, rv?
1515                                              STATE_ACK_SENT: STATE_REQ_SENT);
1516                         break;
1517                 case STATE_ACK_RCVD:
1518                         if (rv) {
1519                                 sppp_cp_change_state(cp, sp, STATE_OPENED);
1520                                 if (debug)
1521                                         log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1522                                             SPP_ARGS(ifp),
1523                                             cp->name);
1524                                 (cp->tlu)(sp);
1525                         } else
1526                                 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1527                         break;
1528                 default:
1529                         printf(SPP_FMT "%s illegal %s in state %s\n",
1530                                SPP_ARGS(ifp), cp->name,
1531                                sppp_cp_type_name(h->type),
1532                                sppp_state_name(sp->state[cp->protoidx]));
1533                         ++ifp->if_ierrors;
1534                 }
1535                 break;
1536         case CONF_ACK:
1537                 if (h->ident != sp->confid[cp->protoidx]) {
1538                         if (debug)
1539                                 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1540                                        SPP_ARGS(ifp), cp->name,
1541                                        h->ident, sp->confid[cp->protoidx]);
1542                         ++ifp->if_ierrors;
1543                         break;
1544                 }
1545                 switch (sp->state[cp->protoidx]) {
1546                 case STATE_CLOSED:
1547                 case STATE_STOPPED:
1548                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1549                         break;
1550                 case STATE_CLOSING:
1551                 case STATE_STOPPING:
1552                         break;
1553                 case STATE_REQ_SENT:
1554                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1555                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1556                         break;
1557                 case STATE_OPENED:
1558                         (cp->tld)(sp);
1559                         /* fall through */
1560                 case STATE_ACK_RCVD:
1561                         (cp->scr)(sp);
1562                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1563                         break;
1564                 case STATE_ACK_SENT:
1565                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1566                         sppp_cp_change_state(cp, sp, STATE_OPENED);
1567                         if (debug)
1568                                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1569                                        SPP_ARGS(ifp), cp->name);
1570                         (cp->tlu)(sp);
1571                         break;
1572                 default:
1573                         printf(SPP_FMT "%s illegal %s in state %s\n",
1574                                SPP_ARGS(ifp), cp->name,
1575                                sppp_cp_type_name(h->type),
1576                                sppp_state_name(sp->state[cp->protoidx]));
1577                         ++ifp->if_ierrors;
1578                 }
1579                 break;
1580         case CONF_NAK:
1581         case CONF_REJ:
1582                 if (h->ident != sp->confid[cp->protoidx]) {
1583                         if (debug)
1584                                 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1585                                        SPP_ARGS(ifp), cp->name,
1586                                        h->ident, sp->confid[cp->protoidx]);
1587                         ++ifp->if_ierrors;
1588                         break;
1589                 }
1590                 if (h->type == CONF_NAK)
1591                         (cp->RCN_nak)(sp, h, len);
1592                 else /* CONF_REJ */
1593                         (cp->RCN_rej)(sp, h, len);
1594
1595                 switch (sp->state[cp->protoidx]) {
1596                 case STATE_CLOSED:
1597                 case STATE_STOPPED:
1598                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1599                         break;
1600                 case STATE_REQ_SENT:
1601                 case STATE_ACK_SENT:
1602                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1603                         /*
1604                          * Slow things down a bit if we think we might be
1605                          * in loopback. Depend on the timeout to send the
1606                          * next configuration request.
1607                          */
1608                         if (sp->pp_loopcnt)
1609                                 break;
1610                         (cp->scr)(sp);
1611                         break;
1612                 case STATE_OPENED:
1613                         (cp->tld)(sp);
1614                         /* fall through */
1615                 case STATE_ACK_RCVD:
1616                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1617                         (cp->scr)(sp);
1618                         break;
1619                 case STATE_CLOSING:
1620                 case STATE_STOPPING:
1621                         break;
1622                 default:
1623                         printf(SPP_FMT "%s illegal %s in state %s\n",
1624                                SPP_ARGS(ifp), cp->name,
1625                                sppp_cp_type_name(h->type),
1626                                sppp_state_name(sp->state[cp->protoidx]));
1627                         ++ifp->if_ierrors;
1628                 }
1629                 break;
1630
1631         case TERM_REQ:
1632                 switch (sp->state[cp->protoidx]) {
1633                 case STATE_ACK_RCVD:
1634                 case STATE_ACK_SENT:
1635                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1636                         /* fall through */
1637                 case STATE_CLOSED:
1638                 case STATE_STOPPED:
1639                 case STATE_CLOSING:
1640                 case STATE_STOPPING:
1641                 case STATE_REQ_SENT:
1642                   sta:
1643                         /* Send Terminate-Ack packet. */
1644                         if (debug)
1645                                 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1646                                     SPP_ARGS(ifp), cp->name);
1647                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1648                         break;
1649                 case STATE_OPENED:
1650                         (cp->tld)(sp);
1651                         sp->rst_counter[cp->protoidx] = 0;
1652                         sppp_cp_change_state(cp, sp, STATE_STOPPING);
1653                         goto sta;
1654                         break;
1655                 default:
1656                         printf(SPP_FMT "%s illegal %s in state %s\n",
1657                                SPP_ARGS(ifp), cp->name,
1658                                sppp_cp_type_name(h->type),
1659                                sppp_state_name(sp->state[cp->protoidx]));
1660                         ++ifp->if_ierrors;
1661                 }
1662                 break;
1663         case TERM_ACK:
1664                 switch (sp->state[cp->protoidx]) {
1665                 case STATE_CLOSED:
1666                 case STATE_STOPPED:
1667                 case STATE_REQ_SENT:
1668                 case STATE_ACK_SENT:
1669                         break;
1670                 case STATE_CLOSING:
1671                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
1672                         (cp->tlf)(sp);
1673                         break;
1674                 case STATE_STOPPING:
1675                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
1676                         (cp->tlf)(sp);
1677                         break;
1678                 case STATE_ACK_RCVD:
1679                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1680                         break;
1681                 case STATE_OPENED:
1682                         (cp->tld)(sp);
1683                         (cp->scr)(sp);
1684                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1685                         break;
1686                 default:
1687                         printf(SPP_FMT "%s illegal %s in state %s\n",
1688                                SPP_ARGS(ifp), cp->name,
1689                                sppp_cp_type_name(h->type),
1690                                sppp_state_name(sp->state[cp->protoidx]));
1691                         ++ifp->if_ierrors;
1692                 }
1693                 break;
1694         case CODE_REJ:
1695                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1696                 log(LOG_INFO,
1697                     SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1698                     "danger will robinson\n",
1699                     SPP_ARGS(ifp), cp->name,
1700                     sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1701                 switch (sp->state[cp->protoidx]) {
1702                 case STATE_CLOSED:
1703                 case STATE_STOPPED:
1704                 case STATE_REQ_SENT:
1705                 case STATE_ACK_SENT:
1706                 case STATE_CLOSING:
1707                 case STATE_STOPPING:
1708                 case STATE_OPENED:
1709                         break;
1710                 case STATE_ACK_RCVD:
1711                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1712                         break;
1713                 default:
1714                         printf(SPP_FMT "%s illegal %s in state %s\n",
1715                                SPP_ARGS(ifp), cp->name,
1716                                sppp_cp_type_name(h->type),
1717                                sppp_state_name(sp->state[cp->protoidx]));
1718                         ++ifp->if_ierrors;
1719                 }
1720                 break;
1721         case PROTO_REJ:
1722             {
1723                 int catastrophic;
1724                 const struct cp *upper;
1725                 int i;
1726                 u_int16_t proto;
1727
1728                 catastrophic = 0;
1729                 upper = NULL;
1730                 proto = ntohs(*((u_int16_t *)p));
1731                 for (i = 0; i < IDX_COUNT; i++) {
1732                         if (cps[i]->proto == proto) {
1733                                 upper = cps[i];
1734                                 break;
1735                         }
1736                 }
1737                 if (upper == NULL)
1738                         catastrophic++;
1739
1740                 if (catastrophic || debug)
1741                         log(catastrophic? LOG_INFO: LOG_DEBUG,
1742                             SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1743                             SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
1744                             sppp_cp_type_name(h->type), proto,
1745                             upper ? upper->name : "unknown",
1746                             upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1747
1748                 /*
1749                  * if we got RXJ+ against conf-req, the peer does not implement
1750                  * this particular protocol type.  terminate the protocol.
1751                  */
1752                 if (upper && !catastrophic) {
1753                         if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1754                                 upper->Close(sp);
1755                                 break;
1756                         }
1757                 }
1758
1759                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1760                 switch (sp->state[cp->protoidx]) {
1761                 case STATE_CLOSED:
1762                 case STATE_STOPPED:
1763                 case STATE_REQ_SENT:
1764                 case STATE_ACK_SENT:
1765                 case STATE_CLOSING:
1766                 case STATE_STOPPING:
1767                 case STATE_OPENED:
1768                         break;
1769                 case STATE_ACK_RCVD:
1770                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1771                         break;
1772                 default:
1773                         printf(SPP_FMT "%s illegal %s in state %s\n",
1774                                SPP_ARGS(ifp), cp->name,
1775                                sppp_cp_type_name(h->type),
1776                                sppp_state_name(sp->state[cp->protoidx]));
1777                         ++ifp->if_ierrors;
1778                 }
1779                 break;
1780             }
1781         case DISC_REQ:
1782                 if (cp->proto != PPP_LCP)
1783                         goto illegal;
1784                 /* Discard the packet. */
1785                 break;
1786         case ECHO_REQ:
1787                 if (cp->proto != PPP_LCP)
1788                         goto illegal;
1789                 if (sp->state[cp->protoidx] != STATE_OPENED) {
1790                         if (debug)
1791                                 addlog(SPP_FMT "lcp echo req but lcp closed\n",
1792                                        SPP_ARGS(ifp));
1793                         ++ifp->if_ierrors;
1794                         break;
1795                 }
1796                 if (len < 8) {
1797                         if (debug)
1798                                 addlog(SPP_FMT "invalid lcp echo request "
1799                                        "packet length: %d bytes\n",
1800                                        SPP_ARGS(ifp), len);
1801                         break;
1802                 }
1803                 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
1804                     ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1805                         /* Line loopback mode detected. */
1806                         printf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1807                         sp->pp_loopcnt = MAXALIVECNT * 5;
1808                         if_down (ifp);
1809                         sppp_qflush (&sp->pp_cpq);
1810
1811                         /* Shut down the PPP link. */
1812                         /* XXX */
1813                         lcp.Down(sp);
1814                         lcp.Up(sp);
1815                         break;
1816                 }
1817                 *(long*)(h+1) = htonl (sp->lcp.magic);
1818                 if (debug)
1819                         addlog(SPP_FMT "got lcp echo req, sending echo rep\n",
1820                                SPP_ARGS(ifp));
1821                 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1822                 break;
1823         case ECHO_REPLY:
1824                 if (cp->proto != PPP_LCP)
1825                         goto illegal;
1826                 if (h->ident != sp->lcp.echoid) {
1827                         ++ifp->if_ierrors;
1828                         break;
1829                 }
1830                 if (len < 8) {
1831                         if (debug)
1832                                 addlog(SPP_FMT "lcp invalid echo reply "
1833                                        "packet length: %d bytes\n",
1834                                        SPP_ARGS(ifp), len);
1835                         break;
1836                 }
1837                 if (debug)
1838                         addlog(SPP_FMT "lcp got echo rep\n",
1839                                SPP_ARGS(ifp));
1840                 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
1841                     ntohl (*(long*)(h+1)) != sp->lcp.magic)
1842                         sp->pp_alivecnt = 0;
1843                 break;
1844         default:
1845                 /* Unknown packet type -- send Code-Reject packet. */
1846           illegal:
1847                 if (debug)
1848                         addlog(SPP_FMT "%s send code-rej for 0x%x\n",
1849                                SPP_ARGS(ifp), cp->name, h->type);
1850                 sppp_cp_send(sp, cp->proto, CODE_REJ,
1851                              ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1852                 ++ifp->if_ierrors;
1853         }
1854 }
1855
1856
1857 /*
1858  * The generic part of all Up/Down/Open/Close/TO event handlers.
1859  * Basically, the state transition handling in the automaton.
1860  */
1861 static void
1862 sppp_up_event(const struct cp *cp, struct sppp *sp)
1863 {
1864         STDDCL;
1865
1866         if (debug)
1867                 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
1868                     SPP_ARGS(ifp), cp->name,
1869                     sppp_state_name(sp->state[cp->protoidx]));
1870
1871         switch (sp->state[cp->protoidx]) {
1872         case STATE_INITIAL:
1873                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1874                 break;
1875         case STATE_STARTING:
1876                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1877                 (cp->scr)(sp);
1878                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1879                 break;
1880         default:
1881                 printf(SPP_FMT "%s illegal up in state %s\n",
1882                        SPP_ARGS(ifp), cp->name,
1883                        sppp_state_name(sp->state[cp->protoidx]));
1884         }
1885 }
1886
1887 static void
1888 sppp_down_event(const struct cp *cp, struct sppp *sp)
1889 {
1890         STDDCL;
1891
1892         if (debug)
1893                 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
1894                     SPP_ARGS(ifp), cp->name,
1895                     sppp_state_name(sp->state[cp->protoidx]));
1896
1897         switch (sp->state[cp->protoidx]) {
1898         case STATE_CLOSED:
1899         case STATE_CLOSING:
1900                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1901                 break;
1902         case STATE_STOPPED:
1903                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1904                 (cp->tls)(sp);
1905                 break;
1906         case STATE_STOPPING:
1907         case STATE_REQ_SENT:
1908         case STATE_ACK_RCVD:
1909         case STATE_ACK_SENT:
1910                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1911                 break;
1912         case STATE_OPENED:
1913                 (cp->tld)(sp);
1914                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1915                 break;
1916         default:
1917                 printf(SPP_FMT "%s illegal down in state %s\n",
1918                        SPP_ARGS(ifp), cp->name,
1919                        sppp_state_name(sp->state[cp->protoidx]));
1920         }
1921 }
1922
1923
1924 static void
1925 sppp_open_event(const struct cp *cp, struct sppp *sp)
1926 {
1927         STDDCL;
1928
1929         if (debug)
1930                 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1931                     SPP_ARGS(ifp), cp->name,
1932                     sppp_state_name(sp->state[cp->protoidx]));
1933
1934         switch (sp->state[cp->protoidx]) {
1935         case STATE_INITIAL:
1936                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1937                 (cp->tls)(sp);
1938                 break;
1939         case STATE_STARTING:
1940                 break;
1941         case STATE_CLOSED:
1942                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1943                 (cp->scr)(sp);
1944                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1945                 break;
1946         case STATE_STOPPED:
1947                 /*
1948                  * Try escaping stopped state.  This seems to bite
1949                  * people occasionally, in particular for IPCP,
1950                  * presumably following previous IPCP negotiation
1951                  * aborts.  Somehow, we must have missed a Down event
1952                  * which would have caused a transition into starting
1953                  * state, so as a bandaid we force the Down event now.
1954                  * This effectively implements (something like the)
1955                  * `restart' option mentioned in the state transition
1956                  * table of RFC 1661.
1957                  */
1958                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1959                 (cp->tls)(sp);
1960                 break;
1961         case STATE_STOPPING:
1962         case STATE_REQ_SENT:
1963         case STATE_ACK_RCVD:
1964         case STATE_ACK_SENT:
1965         case STATE_OPENED:
1966                 break;
1967         case STATE_CLOSING:
1968                 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1969                 break;
1970         }
1971 }
1972
1973
1974 static void
1975 sppp_close_event(const struct cp *cp, struct sppp *sp)
1976 {
1977         STDDCL;
1978
1979         if (debug)
1980                 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
1981                     SPP_ARGS(ifp), cp->name,
1982                     sppp_state_name(sp->state[cp->protoidx]));
1983
1984         switch (sp->state[cp->protoidx]) {
1985         case STATE_INITIAL:
1986         case STATE_CLOSED:
1987         case STATE_CLOSING:
1988                 break;
1989         case STATE_STARTING:
1990                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1991                 (cp->tlf)(sp);
1992                 break;
1993         case STATE_STOPPED:
1994                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1995                 break;
1996         case STATE_STOPPING:
1997                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
1998                 break;
1999         case STATE_OPENED:
2000                 (cp->tld)(sp);
2001                 /* fall through */
2002         case STATE_REQ_SENT:
2003         case STATE_ACK_RCVD:
2004         case STATE_ACK_SENT:
2005                 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
2006                 sppp_cp_send(sp, cp->proto, TERM_REQ,
2007                              ++sp->pp_seq[cp->protoidx], 0, 0);
2008                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2009                 break;
2010         }
2011 }
2012
2013 static void
2014 sppp_to_event(const struct cp *cp, struct sppp *sp)
2015 {
2016         STDDCL;
2017         int s;
2018
2019         s = splimp();
2020         if (debug)
2021                 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
2022                     SPP_ARGS(ifp), cp->name,
2023                     sppp_state_name(sp->state[cp->protoidx]),
2024                     sp->rst_counter[cp->protoidx]);
2025
2026         if (--sp->rst_counter[cp->protoidx] < 0)
2027                 /* TO- event */
2028                 switch (sp->state[cp->protoidx]) {
2029                 case STATE_CLOSING:
2030                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
2031                         (cp->tlf)(sp);
2032                         break;
2033                 case STATE_STOPPING:
2034                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2035                         (cp->tlf)(sp);
2036                         break;
2037                 case STATE_REQ_SENT:
2038                 case STATE_ACK_RCVD:
2039                 case STATE_ACK_SENT:
2040                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2041                         (cp->tlf)(sp);
2042                         break;
2043                 }
2044         else
2045                 /* TO+ event */
2046                 switch (sp->state[cp->protoidx]) {
2047                 case STATE_CLOSING:
2048                 case STATE_STOPPING:
2049                         sppp_cp_send(sp, cp->proto, TERM_REQ,
2050                                      ++sp->pp_seq[cp->protoidx], 0, 0);
2051                         callout_reset(&sp->timeout[cp->protoidx],
2052                                         sp->lcp.timeout, cp->TO, sp);
2053                         break;
2054                 case STATE_REQ_SENT:
2055                 case STATE_ACK_RCVD:
2056                         (cp->scr)(sp);
2057                         /* sppp_cp_change_state() will restart the timer */
2058                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
2059                         break;
2060                 case STATE_ACK_SENT:
2061                         (cp->scr)(sp);
2062                         callout_reset(&sp->timeout[cp->protoidx],
2063                                         sp->lcp.timeout, cp->TO, sp);
2064                         break;
2065                 }
2066
2067         splx(s);
2068 }
2069
2070 /*
2071  * Change the state of a control protocol in the state automaton.
2072  * Takes care of starting/stopping the restart timer.
2073  */
2074 void
2075 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
2076 {
2077         sp->state[cp->protoidx] = newstate;
2078         callout_stop(&sp->timeout[cp->protoidx]);
2079
2080         switch (newstate) {
2081         case STATE_INITIAL:
2082         case STATE_STARTING:
2083         case STATE_CLOSED:
2084         case STATE_STOPPED:
2085         case STATE_OPENED:
2086                 break;
2087         case STATE_CLOSING:
2088         case STATE_STOPPING:
2089         case STATE_REQ_SENT:
2090         case STATE_ACK_RCVD:
2091         case STATE_ACK_SENT:
2092                 callout_reset(&sp->timeout[cp->protoidx],
2093                                 sp->lcp.timeout, cp->TO, sp);
2094                 break;
2095         }
2096 }
2097
2098 /*
2099  *--------------------------------------------------------------------------*
2100  *                                                                          *
2101  *                         The LCP implementation.                          *
2102  *                                                                          *
2103  *--------------------------------------------------------------------------*
2104  */
2105 static void
2106 sppp_lcp_init(struct sppp *sp)
2107 {
2108         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2109         sp->lcp.magic = 0;
2110         sp->state[IDX_LCP] = STATE_INITIAL;
2111         sp->fail_counter[IDX_LCP] = 0;
2112         sp->pp_seq[IDX_LCP] = 0;
2113         sp->pp_rseq[IDX_LCP] = 0;
2114         sp->lcp.protos = 0;
2115         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2116
2117         /* Note that these values are  relevant for all control protocols */
2118         sp->lcp.timeout = 3 * hz;
2119         sp->lcp.max_terminate = 2;
2120         sp->lcp.max_configure = 10;
2121         sp->lcp.max_failure = 10;
2122 #if defined(__DragonFly__)
2123         callout_init(&sp->timeout[IDX_LCP]);
2124 #endif
2125 }
2126
2127 static void
2128 sppp_lcp_up(struct sppp *sp)
2129 {
2130         STDDCL;
2131
2132         sp->pp_alivecnt = 0;
2133         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2134         sp->lcp.magic = 0;
2135         sp->lcp.protos = 0;
2136         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2137         /*
2138          * If this interface is passive or dial-on-demand, and we are
2139          * still in Initial state, it means we've got an incoming
2140          * call.  Activate the interface.
2141          */
2142         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2143                 if (debug)
2144                         log(LOG_DEBUG,
2145                             SPP_FMT "Up event", SPP_ARGS(ifp));
2146                 ifp->if_flags |= IFF_RUNNING;
2147                 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2148                         if (debug)
2149                                 addlog("(incoming call)\n");
2150                         sp->pp_flags |= PP_CALLIN;
2151                         lcp.Open(sp);
2152                 } else if (debug)
2153                         addlog("\n");
2154         } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2155                    (sp->state[IDX_LCP] == STATE_INITIAL)) {
2156                 ifp->if_flags |= IFF_RUNNING;
2157                 lcp.Open(sp);
2158         }
2159
2160         sppp_up_event(&lcp, sp);
2161 }
2162
2163 static void
2164 sppp_lcp_down(struct sppp *sp)
2165 {
2166         STDDCL;
2167
2168         sppp_down_event(&lcp, sp);
2169
2170         /*
2171          * If this is neither a dial-on-demand nor a passive
2172          * interface, simulate an ``ifconfig down'' action, so the
2173          * administrator can force a redial by another ``ifconfig
2174          * up''.  XXX For leased line operation, should we immediately
2175          * try to reopen the connection here?
2176          */
2177         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2178                 log(LOG_INFO,
2179                     SPP_FMT "Down event, taking interface down.\n",
2180                     SPP_ARGS(ifp));
2181                 if_down(ifp);
2182         } else {
2183                 if (debug)
2184                         log(LOG_DEBUG,
2185                             SPP_FMT "Down event (carrier loss)\n",
2186                             SPP_ARGS(ifp));
2187                 sp->pp_flags &= ~PP_CALLIN;
2188                 if (sp->state[IDX_LCP] != STATE_INITIAL)
2189                         lcp.Close(sp);
2190                 ifp->if_flags &= ~IFF_RUNNING;
2191         }
2192 }
2193
2194 static void
2195 sppp_lcp_open(struct sppp *sp)
2196 {
2197         /*
2198          * If we are authenticator, negotiate LCP_AUTH
2199          */
2200         if (sp->hisauth.proto != 0)
2201                 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2202         else
2203                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2204         sp->pp_flags &= ~PP_NEEDAUTH;
2205         sppp_open_event(&lcp, sp);
2206 }
2207
2208 static void
2209 sppp_lcp_close(struct sppp *sp)
2210 {
2211         sppp_close_event(&lcp, sp);
2212 }
2213
2214 static void
2215 sppp_lcp_TO(void *cookie)
2216 {
2217         sppp_to_event(&lcp, (struct sppp *)cookie);
2218 }
2219
2220 /*
2221  * Analyze a configure request.  Return true if it was agreeable, and
2222  * caused action sca, false if it has been rejected or nak'ed, and
2223  * caused action scn.  (The return value is used to make the state
2224  * transition decision in the state automaton.)
2225  */
2226 static int
2227 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2228 {
2229         STDDCL;
2230         u_char *buf, *r, *p;
2231         int origlen, rlen;
2232         u_long nmagic;
2233         u_short authproto;
2234
2235         len -= 4;
2236         origlen = len;
2237         buf = r = malloc (len, M_TEMP, M_INTWAIT);
2238
2239         if (debug)
2240                 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
2241                     SPP_ARGS(ifp));
2242
2243         /* pass 1: check for things that need to be rejected */
2244         p = (void*) (h+1);
2245         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2246                 if (debug)
2247                         addlog(" %s ", sppp_lcp_opt_name(*p));
2248                 switch (*p) {
2249                 case LCP_OPT_MAGIC:
2250                         /* Magic number. */
2251                         if (len >= 6 && p[1] == 6)
2252                                 continue;
2253                         if (debug)
2254                                 addlog("[invalid] ");
2255                         break;
2256                 case LCP_OPT_ASYNC_MAP:
2257                         /* Async control character map. */
2258                         if (len >= 6 && p[1] == 6)
2259                                 continue;
2260                         if (debug)
2261                                 addlog("[invalid] ");
2262                         break;
2263                 case LCP_OPT_MRU:
2264                         /* Maximum receive unit. */
2265                         if (len >= 4 && p[1] == 4)
2266                                 continue;
2267                         if (debug)
2268                                 addlog("[invalid] ");
2269                         break;
2270                 case LCP_OPT_AUTH_PROTO:
2271                         if (len < 4) {
2272                                 if (debug)
2273                                         addlog("[invalid] ");
2274                                 break;
2275                         }
2276                         authproto = (p[2] << 8) + p[3];
2277                         if (authproto == PPP_CHAP && p[1] != 5) {
2278                                 if (debug)
2279                                         addlog("[invalid chap len] ");
2280                                 break;
2281                         }
2282                         if (sp->myauth.proto == 0) {
2283                                 /* we are not configured to do auth */
2284                                 if (debug)
2285                                         addlog("[not configured] ");
2286                                 break;
2287                         }
2288                         /*
2289                          * Remote want us to authenticate, remember this,
2290                          * so we stay in PHASE_AUTHENTICATE after LCP got
2291                          * up.
2292                          */
2293                         sp->pp_flags |= PP_NEEDAUTH;
2294                         continue;
2295                 default:
2296                         /* Others not supported. */
2297                         if (debug)
2298                                 addlog("[rej] ");
2299                         break;
2300                 }
2301                 /* Add the option to rejected list. */
2302                 bcopy (p, r, p[1]);
2303                 r += p[1];
2304                 rlen += p[1];
2305         }
2306         if (rlen) {
2307                 if (debug)
2308                         addlog(" send conf-rej\n");
2309                 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2310                 return 0;
2311         } else if (debug)
2312                 addlog("\n");
2313
2314         /*
2315          * pass 2: check for option values that are unacceptable and
2316          * thus require to be nak'ed.
2317          */
2318         if (debug)
2319                 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2320                     SPP_ARGS(ifp));
2321
2322         p = (void*) (h+1);
2323         len = origlen;
2324         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2325                 if (debug)
2326                         addlog(" %s ", sppp_lcp_opt_name(*p));
2327                 switch (*p) {
2328                 case LCP_OPT_MAGIC:
2329                         /* Magic number -- extract. */
2330                         nmagic = (u_long)p[2] << 24 |
2331                                 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2332                         if (nmagic != sp->lcp.magic) {
2333                                 sp->pp_loopcnt = 0;
2334                                 if (debug)
2335                                         addlog("0x%lx ", nmagic);
2336                                 continue;
2337                         }
2338                         if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
2339                                 addlog("[glitch] ");
2340                         ++sp->pp_loopcnt;
2341                         /*
2342                          * We negate our magic here, and NAK it.  If
2343                          * we see it later in an NAK packet, we
2344                          * suggest a new one.
2345                          */
2346                         nmagic = ~sp->lcp.magic;
2347                         /* Gonna NAK it. */
2348                         p[2] = nmagic >> 24;
2349                         p[3] = nmagic >> 16;
2350                         p[4] = nmagic >> 8;
2351                         p[5] = nmagic;
2352                         break;
2353
2354                 case LCP_OPT_ASYNC_MAP:
2355                         /*
2356                          * Async control character map -- just ignore it.
2357                          *
2358                          * Quote from RFC 1662, chapter 6:
2359                          * To enable this functionality, synchronous PPP
2360                          * implementations MUST always respond to the
2361                          * Async-Control-Character-Map Configuration
2362                          * Option with the LCP Configure-Ack.  However,
2363                          * acceptance of the Configuration Option does
2364                          * not imply that the synchronous implementation
2365                          * will do any ACCM mapping.  Instead, all such
2366                          * octet mapping will be performed by the
2367                          * asynchronous-to-synchronous converter.
2368                          */
2369                         continue;
2370
2371                 case LCP_OPT_MRU:
2372                         /*
2373                          * Maximum receive unit.  Always agreeable,
2374                          * but ignored by now.
2375                          */
2376                         sp->lcp.their_mru = p[2] * 256 + p[3];
2377                         if (debug)
2378                                 addlog("%lu ", sp->lcp.their_mru);
2379                         continue;
2380
2381                 case LCP_OPT_AUTH_PROTO:
2382                         authproto = (p[2] << 8) + p[3];
2383                         if (sp->myauth.proto != authproto) {
2384                                 /* not agreed, nak */
2385                                 if (debug)
2386                                         addlog("[mine %s != his %s] ",
2387                                                sppp_proto_name(sp->hisauth.proto),
2388                                                sppp_proto_name(authproto));
2389                                 p[2] = sp->myauth.proto >> 8;
2390                                 p[3] = sp->myauth.proto;
2391                                 break;
2392                         }
2393                         if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2394                                 if (debug)
2395                                         addlog("[chap not MD5] ");
2396                                 p[4] = CHAP_MD5;
2397                                 break;
2398                         }
2399                         continue;
2400                 }
2401                 /* Add the option to nak'ed list. */
2402                 bcopy (p, r, p[1]);
2403                 r += p[1];
2404                 rlen += p[1];
2405         }
2406         if (rlen) {
2407                 /*
2408                  * Local and remote magics equal -- loopback?
2409                  */
2410                 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2411                         if (sp->pp_loopcnt == MAXALIVECNT*5)
2412                                 printf (SPP_FMT "loopback\n",
2413                                         SPP_ARGS(ifp));
2414                         if (ifp->if_flags & IFF_UP) {
2415                                 if_down(ifp);
2416                                 sppp_qflush(&sp->pp_cpq);
2417                                 /* XXX ? */
2418                                 lcp.Down(sp);
2419                                 lcp.Up(sp);
2420                         }
2421                 } else if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2422                         if (debug)
2423                                 addlog(" max_failure (%d) exceeded, "
2424                                        "send conf-rej\n",
2425                                        sp->lcp.max_failure);
2426                         sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2427                 } else {
2428                         if (debug)
2429                                 addlog(" send conf-nak\n");
2430                         sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2431                 }
2432         } else {
2433                 if (debug)
2434                         addlog(" send conf-ack\n");
2435                 sp->fail_counter[IDX_LCP] = 0;
2436                 sp->pp_loopcnt = 0;
2437                 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2438                               h->ident, origlen, h+1);
2439         }
2440
2441         free (buf, M_TEMP);
2442         return (rlen == 0);
2443 }
2444
2445 /*
2446  * Analyze the LCP Configure-Reject option list, and adjust our
2447  * negotiation.
2448  */
2449 static void
2450 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2451 {
2452         STDDCL;
2453         u_char *buf, *p;
2454
2455         len -= 4;
2456         buf = malloc (len, M_TEMP, M_INTWAIT);
2457
2458         if (debug)
2459                 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2460                     SPP_ARGS(ifp));
2461
2462         p = (void*) (h+1);
2463         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2464                 if (debug)
2465                         addlog(" %s ", sppp_lcp_opt_name(*p));
2466                 switch (*p) {
2467                 case LCP_OPT_MAGIC:
2468                         /* Magic number -- can't use it, use 0 */
2469                         sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2470                         sp->lcp.magic = 0;
2471                         break;
2472                 case LCP_OPT_MRU:
2473                         /*
2474                          * Should not be rejected anyway, since we only
2475                          * negotiate a MRU if explicitly requested by
2476                          * peer.
2477                          */
2478                         sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2479                         break;
2480                 case LCP_OPT_AUTH_PROTO:
2481                         /*
2482                          * Peer doesn't want to authenticate himself,
2483                          * deny unless this is a dialout call, and
2484                          * AUTHFLAG_NOCALLOUT is set.
2485                          */
2486                         if ((sp->pp_flags & PP_CALLIN) == 0 &&
2487                             (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2488                                 if (debug)
2489                                         addlog("[don't insist on auth "
2490                                                "for callout]");
2491                                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2492                                 break;
2493                         }
2494                         if (debug)
2495                                 addlog("[access denied]\n");
2496                         lcp.Close(sp);
2497                         break;
2498                 }
2499         }
2500         if (debug)
2501                 addlog("\n");
2502         free (buf, M_TEMP);
2503         return;
2504 }
2505
2506 /*
2507  * Analyze the LCP Configure-NAK option list, and adjust our
2508  * negotiation.
2509  */
2510 static void
2511 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2512 {
2513         STDDCL;
2514         u_char *buf, *p;
2515         u_long magic;
2516
2517         len -= 4;
2518         buf = malloc (len, M_TEMP, M_INTWAIT);
2519
2520         if (debug)
2521                 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2522                     SPP_ARGS(ifp));
2523
2524         p = (void*) (h+1);
2525         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2526                 if (debug)
2527                         addlog(" %s ", sppp_lcp_opt_name(*p));
2528                 switch (*p) {
2529                 case LCP_OPT_MAGIC:
2530                         /* Magic number -- renegotiate */
2531                         if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2532                             len >= 6 && p[1] == 6) {
2533                                 magic = (u_long)p[2] << 24 |
2534                                         (u_long)p[3] << 16 | p[4] << 8 | p[5];
2535                                 /*
2536                                  * If the remote magic is our negated one,
2537                                  * this looks like a loopback problem.
2538                                  * Suggest a new magic to make sure.
2539                                  */
2540                                 if (magic == ~sp->lcp.magic) {
2541                                         if (debug)
2542                                                 addlog("magic glitch ");
2543 #if defined(__DragonFly__)
2544                                         sp->lcp.magic = random();
2545 #else
2546                                         sp->lcp.magic = time.tv_sec + time.tv_usec;
2547 #endif
2548                                 } else {
2549                                         sp->lcp.magic = magic;
2550                                         if (debug)
2551                                                 addlog("%lu ", magic);
2552                                 }
2553                         }
2554                         break;
2555                 case LCP_OPT_MRU:
2556                         /*
2557                          * Peer wants to advise us to negotiate an MRU.
2558                          * Agree on it if it's reasonable, or use
2559                          * default otherwise.
2560                          */
2561                         if (len >= 4 && p[1] == 4) {
2562                                 u_int mru = p[2] * 256 + p[3];
2563                                 if (debug)
2564                                         addlog("%d ", mru);
2565                                 if (mru < PP_MTU || mru > PP_MAX_MRU)
2566                                         mru = PP_MTU;
2567                                 sp->lcp.mru = mru;
2568                                 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2569                         }
2570                         break;
2571                 case LCP_OPT_AUTH_PROTO:
2572                         /*
2573                          * Peer doesn't like our authentication method,
2574                          * deny.
2575                          */
2576                         if (debug)
2577                                 addlog("[access denied]\n");
2578                         lcp.Close(sp);
2579                         break;
2580                 }
2581         }
2582         if (debug)
2583                 addlog("\n");
2584         free (buf, M_TEMP);
2585         return;
2586 }
2587
2588 static void
2589 sppp_lcp_tlu(struct sppp *sp)
2590 {
2591         STDDCL;
2592         int i;
2593         u_long mask;
2594
2595         /* XXX ? */
2596         if (! (ifp->if_flags & IFF_UP) &&
2597             (ifp->if_flags & IFF_RUNNING)) {
2598                 /* Coming out of loopback mode. */
2599                 if_up(ifp);
2600                 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
2601         }
2602
2603         for (i = 0; i < IDX_COUNT; i++)
2604                 if ((cps[i])->flags & CP_QUAL)
2605                         (cps[i])->Open(sp);
2606
2607         if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2608             (sp->pp_flags & PP_NEEDAUTH) != 0)
2609                 sp->pp_phase = PHASE_AUTHENTICATE;
2610         else
2611                 sp->pp_phase = PHASE_NETWORK;
2612
2613         if (debug)
2614                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2615                     sppp_phase_name(sp->pp_phase));
2616
2617         /*
2618          * Open all authentication protocols.  This is even required
2619          * if we already proceeded to network phase, since it might be
2620          * that remote wants us to authenticate, so we might have to
2621          * send a PAP request.  Undesired authentication protocols
2622          * don't do anything when they get an Open event.
2623          */
2624         for (i = 0; i < IDX_COUNT; i++)
2625                 if ((cps[i])->flags & CP_AUTH)
2626                         (cps[i])->Open(sp);
2627
2628         if (sp->pp_phase == PHASE_NETWORK) {
2629                 /* Notify all NCPs. */
2630                 for (i = 0; i < IDX_COUNT; i++)
2631                         if (((cps[i])->flags & CP_NCP) &&
2632                             /*
2633                              * XXX
2634                              * Hack to administratively disable IPv6 if
2635                              * not desired.  Perhaps we should have another
2636                              * flag for this, but right now, we can make
2637                              * all struct cp's read/only.
2638                              */
2639                             (cps[i] != &ipv6cp ||
2640                              (sp->confflags & CONF_ENABLE_IPV6)))
2641                                 (cps[i])->Open(sp);
2642         }
2643
2644         /* Send Up events to all started protos. */
2645         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2646                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2647                         (cps[i])->Up(sp);
2648
2649         /* notify low-level driver of state change */
2650         if (sp->pp_chg)
2651                 sp->pp_chg(sp, (int)sp->pp_phase);
2652
2653         if (sp->pp_phase == PHASE_NETWORK)
2654                 /* if no NCP is starting, close down */
2655                 sppp_lcp_check_and_close(sp);
2656 }
2657
2658 static void
2659 sppp_lcp_tld(struct sppp *sp)
2660 {
2661         STDDCL;
2662         int i;
2663         u_long mask;
2664
2665         sp->pp_phase = PHASE_TERMINATE;
2666
2667         if (debug)
2668                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2669                     sppp_phase_name(sp->pp_phase));
2670
2671         /*
2672          * Take upper layers down.  We send the Down event first and
2673          * the Close second to prevent the upper layers from sending
2674          * ``a flurry of terminate-request packets'', as the RFC
2675          * describes it.
2676          */
2677         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2678                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2679                         (cps[i])->Down(sp);
2680                         (cps[i])->Close(sp);
2681                 }
2682 }
2683
2684 static void
2685 sppp_lcp_tls(struct sppp *sp)
2686 {
2687         STDDCL;
2688
2689         sp->pp_phase = PHASE_ESTABLISH;
2690
2691         if (debug)
2692                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2693                     sppp_phase_name(sp->pp_phase));
2694
2695         /* Notify lower layer if desired. */
2696         if (sp->pp_tls)
2697                 (sp->pp_tls)(sp);
2698         else
2699                 (sp->pp_up)(sp);
2700 }
2701
2702 static void
2703 sppp_lcp_tlf(struct sppp *sp)
2704 {
2705         STDDCL;
2706
2707         sp->pp_phase = PHASE_DEAD;
2708         if (debug)
2709                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2710                     sppp_phase_name(sp->pp_phase));
2711
2712         /* Notify lower layer if desired. */
2713         if (sp->pp_tlf)
2714                 (sp->pp_tlf)(sp);
2715         else
2716                 (sp->pp_down)(sp);
2717 }
2718
2719 static void
2720 sppp_lcp_scr(struct sppp *sp)
2721 {
2722         char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2723         int i = 0;
2724         u_short authproto;
2725
2726         if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2727                 if (! sp->lcp.magic)
2728 #if defined(__DragonFly__)
2729                         sp->lcp.magic = random();
2730 #else
2731                         sp->lcp.magic = time.tv_sec + time.tv_usec;
2732 #endif
2733                 opt[i++] = LCP_OPT_MAGIC;
2734                 opt[i++] = 6;
2735                 opt[i++] = sp->lcp.magic >> 24;
2736                 opt[i++] = sp->lcp.magic >> 16;
2737                 opt[i++] = sp->lcp.magic >> 8;
2738                 opt[i++] = sp->lcp.magic;
2739         }
2740
2741         if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2742                 opt[i++] = LCP_OPT_MRU;
2743                 opt[i++] = 4;
2744                 opt[i++] = sp->lcp.mru >> 8;
2745                 opt[i++] = sp->lcp.mru;
2746         }
2747
2748         if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2749                 authproto = sp->hisauth.proto;
2750                 opt[i++] = LCP_OPT_AUTH_PROTO;
2751                 opt[i++] = authproto == PPP_CHAP? 5: 4;
2752                 opt[i++] = authproto >> 8;
2753                 opt[i++] = authproto;
2754                 if (authproto == PPP_CHAP)
2755                         opt[i++] = CHAP_MD5;
2756         }
2757
2758         sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2759         sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2760 }
2761
2762 /*
2763  * Check the open NCPs, return true if at least one NCP is open.
2764  */
2765 static int
2766 sppp_ncp_check(struct sppp *sp)
2767 {
2768         int i, mask;
2769
2770         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2771                 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2772                         return 1;
2773         return 0;
2774 }
2775
2776 /*
2777  * Re-check the open NCPs and see if we should terminate the link.
2778  * Called by the NCPs during their tlf action handling.
2779  */
2780 static void
2781 sppp_lcp_check_and_close(struct sppp *sp)
2782 {
2783
2784         if (sp->pp_phase < PHASE_NETWORK)
2785                 /* don't bother, we are already going down */
2786                 return;
2787
2788         if (sppp_ncp_check(sp))
2789                 return;
2790
2791         lcp.Close(sp);
2792 }
2793
2794 /*
2795  *--------------------------------------------------------------------------*
2796  *                                                                          *
2797  *                        The IPCP implementation.                          *
2798  *                                                                          *
2799  *--------------------------------------------------------------------------*
2800  */
2801
2802 static void
2803 sppp_ipcp_init(struct sppp *sp)
2804 {
2805         sp->ipcp.opts = 0;
2806         sp->ipcp.flags = 0;
2807         sp->state[IDX_IPCP] = STATE_INITIAL;
2808         sp->fail_counter[IDX_IPCP] = 0;
2809         sp->pp_seq[IDX_IPCP] = 0;
2810         sp->pp_rseq[IDX_IPCP] = 0;
2811 #if defined(__DragonFly__)
2812         callout_init(&sp->timeout[IDX_IPCP]);
2813 #endif
2814 }
2815
2816 static void
2817 sppp_ipcp_up(struct sppp *sp)
2818 {
2819         sppp_up_event(&ipcp, sp);
2820 }
2821
2822 static void
2823 sppp_ipcp_down(struct sppp *sp)
2824 {
2825         sppp_down_event(&ipcp, sp);
2826 }
2827
2828 static void
2829 sppp_ipcp_open(struct sppp *sp)
2830 {
2831         STDDCL;
2832         u_long myaddr, hisaddr;
2833
2834         sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
2835                             IPCP_MYADDR_DYN | IPCP_VJ);
2836         sp->ipcp.opts = 0;
2837
2838         sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2839         /*
2840          * If we don't have his address, this probably means our
2841          * interface doesn't want to talk IP at all.  (This could
2842          * be the case if somebody wants to speak only IPX, for
2843          * example.)  Don't open IPCP in this case.
2844          */
2845         if (hisaddr == 0L) {
2846                 /* XXX this message should go away */
2847                 if (debug)
2848                         log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2849                             SPP_ARGS(ifp));
2850                 return;
2851         }
2852         if (myaddr == 0L) {
2853                 /*
2854                  * I don't have an assigned address, so i need to
2855                  * negotiate my address.
2856                  */
2857                 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2858                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2859         } else
2860                 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2861         if (sp->confflags & CONF_ENABLE_VJ) {
2862                 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
2863                 sp->ipcp.max_state = MAX_STATES - 1;
2864                 sp->ipcp.compress_cid = 1;
2865         }
2866         sppp_open_event(&ipcp, sp);
2867 }
2868
2869 static void
2870 sppp_ipcp_close(struct sppp *sp)
2871 {
2872         sppp_close_event(&ipcp, sp);
2873         if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2874                 /*
2875                  * My address was dynamic, clear it again.
2876                  */
2877                 sppp_set_ip_addr(sp, 0L);
2878 }
2879
2880 static void
2881 sppp_ipcp_TO(void *cookie)
2882 {
2883         sppp_to_event(&ipcp, (struct sppp *)cookie);
2884 }
2885
2886 /*
2887  * Analyze a configure request.  Return true if it was agreeable, and
2888  * caused action sca, false if it has been rejected or nak'ed, and
2889  * caused action scn.  (The return value is used to make the state
2890  * transition decision in the state automaton.)
2891  */
2892 static int
2893 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2894 {
2895         u_char *buf, *r, *p;
2896         struct ifnet *ifp = &sp->pp_if;
2897         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2898         u_long hisaddr, desiredaddr;
2899         int gotmyaddr = 0;
2900         int desiredcomp;
2901
2902         len -= 4;
2903         origlen = len;
2904         /*
2905          * Make sure to allocate a buf that can at least hold a
2906          * conf-nak with an `address' option.  We might need it below.
2907          */
2908         buf = r = malloc ((len < 6? 6: len), M_TEMP, M_INTWAIT);
2909
2910         /* pass 1: see if we can recognize them */
2911         if (debug)
2912                 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2913                     SPP_ARGS(ifp));
2914         p = (void*) (h+1);
2915         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2916                 if (debug)
2917                         addlog(" %s ", sppp_ipcp_opt_name(*p));
2918                 switch (*p) {
2919                 case IPCP_OPT_COMPRESSION:
2920                         if (!(sp->confflags & CONF_ENABLE_VJ)) {
2921                                 /* VJ compression administratively disabled */
2922                                 if (debug)
2923                                         addlog("[locally disabled] ");
2924                                 break;
2925                         }
2926                         /*
2927                          * In theory, we should only conf-rej an
2928                          * option that is shorter than RFC 1618
2929                          * requires (i.e. < 4), and should conf-nak
2930                          * anything else that is not VJ.  However,
2931                          * since our algorithm always uses the
2932                          * original option to NAK it with new values,
2933                          * things would become more complicated.  In
2934                          * pratice, the only commonly implemented IP
2935                          * compression option is VJ anyway, so the
2936                          * difference is negligible.
2937                          */
2938                         if (len >= 6 && p[1] == 6) {
2939                                 /*
2940                                  * correctly formed compression option
2941                                  * that could be VJ compression
2942                                  */
2943                                 continue;
2944                         }
2945                         if (debug)
2946                                 addlog("optlen %d [invalid/unsupported] ",
2947                                     p[1]);
2948                         break;
2949                 case IPCP_OPT_ADDRESS:
2950                         if (len >= 6 && p[1] == 6) {
2951                                 /* correctly formed address option */
2952                                 continue;
2953                         }
2954                         if (debug)
2955                                 addlog("[invalid] ");
2956                         break;
2957                 default:
2958                         /* Others not supported. */
2959                         if (debug)
2960                                 addlog("[rej] ");
2961                         break;
2962                 }
2963                 /* Add the option to rejected list. */
2964                 bcopy (p, r, p[1]);
2965                 r += p[1];
2966                 rlen += p[1];
2967         }
2968         if (rlen) {
2969                 if (debug)
2970                         addlog(" send conf-rej\n");
2971                 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
2972                 return 0;
2973         } else if (debug)
2974                 addlog("\n");
2975
2976         /* pass 2: parse option values */
2977         sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
2978         if (debug)
2979                 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
2980                        SPP_ARGS(ifp));
2981         p = (void*) (h+1);
2982         len = origlen;
2983         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2984                 if (debug)
2985                         addlog(" %s ", sppp_ipcp_opt_name(*p));
2986                 switch (*p) {
2987                 case IPCP_OPT_COMPRESSION:
2988                         desiredcomp = p[2] << 8 | p[3];
2989                         /* We only support VJ */
2990                         if (desiredcomp == IPCP_COMP_VJ) {
2991                                 if (debug)
2992                                         addlog("VJ [ack] ");
2993                                 sp->ipcp.flags |= IPCP_VJ;
2994                                 sl_compress_init(sp->pp_comp, p[4]);
2995                                 sp->ipcp.max_state = p[4];
2996                                 sp->ipcp.compress_cid = p[5];
2997                                 continue;
2998                         }
2999                         if (debug)
3000                                 addlog("compproto %#04x [not supported] ",
3001                                     desiredcomp);
3002                         p[2] = IPCP_COMP_VJ >> 8;
3003                         p[3] = IPCP_COMP_VJ;
3004                         p[4] = sp->ipcp.max_state;
3005                         p[5] = sp->ipcp.compress_cid;
3006                         break;
3007                 case IPCP_OPT_ADDRESS:
3008                         /* This is the address he wants in his end */
3009                         desiredaddr = p[2] << 24 | p[3] << 16 |
3010                                 p[4] << 8 | p[5];
3011                         if (desiredaddr == hisaddr ||
3012                             (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
3013                                 /*
3014                                  * Peer's address is same as our value,
3015                                  * or we have set it to 0.0.0.* to
3016                                  * indicate that we do not really care,
3017                                  * this is agreeable.  Gonna conf-ack
3018                                  * it.
3019                                  */
3020                                 if (debug)
3021                                         addlog("%s [ack] ",
3022                                                 sppp_dotted_quad(hisaddr));
3023                                 /* record that we've seen it already */
3024                                 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
3025                                 continue;
3026                         }
3027                         /*
3028                          * The address wasn't agreeable.  This is either
3029                          * he sent us 0.0.0.0, asking to assign him an
3030                          * address, or he send us another address not
3031                          * matching our value.  Either case, we gonna
3032                          * conf-nak it with our value.
3033                          * XXX: we should "rej" if hisaddr == 0
3034                          */
3035                         if (debug) {
3036                                 if (desiredaddr == 0)
3037                                         addlog("[addr requested] ");
3038                                 else
3039                                         addlog("%s [not agreed] ",
3040                                                 sppp_dotted_quad(desiredaddr));
3041
3042                         }
3043                         p[2] = hisaddr >> 24;
3044                         p[3] = hisaddr >> 16;
3045                         p[4] = hisaddr >> 8;
3046                         p[5] = hisaddr;
3047                         break;
3048                 }
3049                 /* Add the option to nak'ed list. */
3050                 bcopy (p, r, p[1]);
3051                 r += p[1];
3052                 rlen += p[1];
3053         }
3054
3055         /*
3056          * If we are about to conf-ack the request, but haven't seen
3057          * his address so far, gonna conf-nak it instead, with the
3058          * `address' option present and our idea of his address being
3059          * filled in there, to request negotiation of both addresses.
3060          *
3061          * XXX This can result in an endless req - nak loop if peer
3062          * doesn't want to send us his address.  Q: What should we do
3063          * about it?  XXX  A: implement the max-failure counter.
3064          */
3065         if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
3066                 buf[0] = IPCP_OPT_ADDRESS;
3067                 buf[1] = 6;
3068                 buf[2] = hisaddr >> 24;
3069                 buf[3] = hisaddr >> 16;
3070                 buf[4] = hisaddr >> 8;
3071                 buf[5] = hisaddr;
3072                 rlen = 6;
3073                 if (debug)
3074                         addlog("still need hisaddr ");
3075         }
3076
3077         if (rlen) {
3078                 if (debug)
3079                         addlog(" send conf-nak\n");
3080                 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
3081         } else {
3082                 if (debug)
3083                         addlog(" send conf-ack\n");
3084                 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
3085                               h->ident, origlen, h+1);
3086         }
3087
3088         free (buf, M_TEMP);
3089         return (rlen == 0);
3090 }
3091
3092 /*
3093  * Analyze the IPCP Configure-Reject option list, and adjust our
3094  * negotiation.
3095  */
3096 static void
3097 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3098 {
3099         u_char *buf, *p;
3100         struct ifnet *ifp = &sp->pp_if;
3101         int debug = ifp->if_flags & IFF_DEBUG;
3102
3103         len -= 4;
3104         buf = malloc (len, M_TEMP, M_INTWAIT);
3105
3106         if (debug)
3107                 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
3108                     SPP_ARGS(ifp));
3109
3110         p = (void*) (h+1);
3111         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3112                 if (debug)
3113                         addlog(" %s ", sppp_ipcp_opt_name(*p));
3114                 switch (*p) {
3115                 case IPCP_OPT_COMPRESSION:
3116                         sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
3117                         break;
3118                 case IPCP_OPT_ADDRESS:
3119                         /*
3120                          * Peer doesn't grok address option.  This is
3121                          * bad.  XXX  Should we better give up here?
3122                          * XXX We could try old "addresses" option...
3123                          */
3124                         sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3125                         break;
3126                 }
3127         }
3128         if (debug)
3129                 addlog("\n");
3130         free (buf, M_TEMP);
3131         return;
3132 }
3133
3134 /*
3135  * Analyze the IPCP Configure-NAK option list, and adjust our
3136  * negotiation.
3137  */
3138 static void
3139 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3140 {
3141         u_char *buf, *p;
3142         struct ifnet *ifp = &sp->pp_if;
3143         int debug = ifp->if_flags & IFF_DEBUG;
3144         int desiredcomp;
3145         u_long wantaddr;
3146
3147         len -= 4;
3148         buf = malloc (len, M_TEMP, M_INTWAIT);
3149
3150         if (debug)
3151                 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
3152                     SPP_ARGS(ifp));
3153
3154         p = (void*) (h+1);
3155         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3156                 if (debug)
3157                         addlog(" %s ", sppp_ipcp_opt_name(*p));
3158                 switch (*p) {
3159                 case IPCP_OPT_COMPRESSION:
3160                         if (len >= 6 && p[1] == 6) {
3161                                 desiredcomp = p[2] << 8 | p[3];
3162                                 if (debug)
3163                                         addlog("[wantcomp %#04x] ",
3164                                                 desiredcomp);
3165                                 if (desiredcomp == IPCP_COMP_VJ) {
3166                                         sl_compress_init(sp->pp_comp, p[4]);
3167                                         sp->ipcp.max_state = p[4];
3168                                         sp->ipcp.compress_cid = p[5];
3169                                         if (debug)
3170                                                 addlog("[agree] ");
3171                                 } else
3172                                         sp->ipcp.opts &=
3173                                                 ~(1 << IPCP_OPT_COMPRESSION);
3174                         }
3175                         break;
3176                 case IPCP_OPT_ADDRESS:
3177                         /*
3178                          * Peer doesn't like our local IP address.  See
3179                          * if we can do something for him.  We'll drop
3180                          * him our address then.
3181                          */
3182                         if (len >= 6 && p[1] == 6) {
3183                                 wantaddr = p[2] << 24 | p[3] << 16 |
3184                                         p[4] << 8 | p[5];
3185                                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3186                                 if (debug)
3187                                         addlog("[wantaddr %s] ",
3188                                                sppp_dotted_quad(wantaddr));
3189                                 /*
3190                                  * When doing dynamic address assignment,
3191                                  * we accept his offer.  Otherwise, we
3192                                  * ignore it and thus continue to negotiate
3193                                  * our already existing value.
3194                                  * XXX: Bogus, if he said no once, he'll
3195                                  * just say no again, might as well die.
3196                                  */
3197                                 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3198                                         sppp_set_ip_addr(sp, wantaddr);
3199                                         if (debug)
3200                                                 addlog("[agree] ");
3201                                         sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3202                                 }
3203                         }
3204                         break;
3205                 }
3206         }
3207         if (debug)
3208                 addlog("\n");
3209         free (buf, M_TEMP);
3210         return;
3211 }
3212
3213 static void
3214 sppp_ipcp_tlu(struct sppp *sp)
3215 {
3216         /* we are up - notify isdn daemon */
3217         if (sp->pp_con)
3218                 sp->pp_con(sp);
3219 }
3220
3221 static void
3222 sppp_ipcp_tld(struct sppp *sp)
3223 {
3224 }
3225
3226 static void
3227 sppp_ipcp_tls(struct sppp *sp)
3228 {
3229         /* indicate to LCP that it must stay alive */
3230         sp->lcp.protos |= (1 << IDX_IPCP);
3231 }
3232
3233 static void
3234 sppp_ipcp_tlf(struct sppp *sp)
3235 {
3236         /* we no longer need LCP */
3237         sp->lcp.protos &= ~(1 << IDX_IPCP);
3238         sppp_lcp_check_and_close(sp);
3239 }
3240
3241 static void
3242 sppp_ipcp_scr(struct sppp *sp)
3243 {
3244         char opt[6 /* compression */ + 6 /* address */];
3245         u_long ouraddr;
3246         int i = 0;
3247
3248         if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3249                 opt[i++] = IPCP_OPT_COMPRESSION;
3250                 opt[i++] = 6;
3251                 opt[i++] = IPCP_COMP_VJ >> 8;
3252                 opt[i++] = IPCP_COMP_VJ;
3253                 opt[i++] = sp->ipcp.max_state;
3254                 opt[i++] = sp->ipcp.compress_cid;
3255         }
3256         if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3257                 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3258                 opt[i++] = IPCP_OPT_ADDRESS;
3259                 opt[i++] = 6;
3260                 opt[i++] = ouraddr >> 24;
3261                 opt[i++] = ouraddr >> 16;
3262                 opt[i++] = ouraddr >> 8;
3263                 opt[i++] = ouraddr;
3264         }
3265
3266         sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3267         sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3268 }
3269
3270 /*
3271  *--------------------------------------------------------------------------*
3272  *                                                                          *
3273  *                      The IPv6CP implementation.                          *
3274  *                                                                          *
3275  *--------------------------------------------------------------------------*
3276  */
3277
3278 #ifdef INET6
3279 static void
3280 sppp_ipv6cp_init(struct sppp *sp)
3281 {
3282         sp->ipv6cp.opts = 0;
3283         sp->ipv6cp.flags = 0;
3284         sp->state[IDX_IPV6CP] = STATE_INITIAL;
3285         sp->fail_counter[IDX_IPV6CP] = 0;
3286         sp->pp_seq[IDX_IPV6CP] = 0;
3287         sp->pp_rseq[IDX_IPV6CP] = 0;
3288 #if defined(__NetBSD__)
3289         callout_init(&sp->ch[IDX_IPV6CP]);
3290 #endif
3291 #if defined(__DragonFly__)
3292         callout_init(&sp->timeout[IDX_IPV6CP]);
3293 #endif
3294 }
3295
3296 static void
3297 sppp_ipv6cp_up(struct sppp *sp)
3298 {
3299         sppp_up_event(&ipv6cp, sp);
3300 }
3301
3302 static void
3303 sppp_ipv6cp_down(struct sppp *sp)
3304 {
3305         sppp_down_event(&ipv6cp, sp);
3306 }
3307
3308 static void
3309 sppp_ipv6cp_open(struct sppp *sp)
3310 {
3311         STDDCL;
3312         struct in6_addr myaddr, hisaddr;
3313
3314 #ifdef IPV6CP_MYIFID_DYN
3315         sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3316 #else
3317         sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3318 #endif
3319
3320         sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3321         /*
3322          * If we don't have our address, this probably means our
3323          * interface doesn't want to talk IPv6 at all.  (This could
3324          * be the case if somebody wants to speak only IPX, for
3325          * example.)  Don't open IPv6CP in this case.
3326          */
3327         if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3328                 /* XXX this message should go away */
3329                 if (debug)
3330                         log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
3331                             SPP_ARGS(ifp));
3332                 return;
3333         }
3334
3335         sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3336         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3337         sppp_open_event(&ipv6cp, sp);
3338 }
3339
3340 static void
3341 sppp_ipv6cp_close(struct sppp *sp)
3342 {
3343         sppp_close_event(&ipv6cp, sp);
3344 }
3345
3346 static void
3347 sppp_ipv6cp_TO(void *cookie)
3348 {
3349         sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3350 }
3351
3352 /*
3353  * Analyze a configure request.  Return true if it was agreeable, and
3354  * caused action sca, false if it has been rejected or nak'ed, and
3355  * caused action scn.  (The return value is used to make the state
3356  * transition decision in the state automaton.)
3357  */
3358 static int
3359 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3360 {
3361         u_char *buf, *r, *p;
3362         struct ifnet *ifp = &sp->pp_if;
3363         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3364         struct in6_addr myaddr, desiredaddr, suggestaddr;
3365         int ifidcount;
3366         int type;
3367         int collision, nohisaddr;
3368
3369         len -= 4;
3370         origlen = len;
3371         /*
3372          * Make sure to allocate a buf that can at least hold a
3373          * conf-nak with an `address' option.  We might need it below.
3374          */
3375         buf = r = malloc ((len < 6? 6: len), M_TEMP, M_INTWAIT);
3376
3377         /* pass 1: see if we can recognize them */
3378         if (debug)
3379                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
3380                     SPP_ARGS(ifp));
3381         p = (void*) (h+1);
3382         ifidcount = 0;
3383         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3384                 if (debug)
3385                         addlog(" %s", sppp_ipv6cp_opt_name(*p));
3386                 switch (*p) {
3387                 case IPV6CP_OPT_IFID:
3388                         if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3389                                 /* correctly formed address option */
3390                                 ifidcount++;
3391                                 continue;
3392                         }
3393                         if (debug)
3394                                 addlog(" [invalid]");
3395                         break;
3396 #ifdef notyet
3397                 case IPV6CP_OPT_COMPRESSION:
3398                         if (len >= 4 && p[1] >= 4) {
3399                                 /* correctly formed compress option */
3400                                 continue;
3401                         }
3402                         if (debug)
3403                                 addlog(" [invalid]");
3404                         break;
3405 #endif
3406                 default:
3407                         /* Others not supported. */
3408                         if (debug)
3409                                 addlog(" [rej]");
3410                         break;
3411                 }
3412                 /* Add the option to rejected list. */
3413                 bcopy (p, r, p[1]);
3414                 r += p[1];
3415                 rlen += p[1];
3416         }
3417         if (rlen) {
3418                 if (debug)
3419                         addlog(" send conf-rej\n");
3420                 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3421                 goto end;
3422         } else if (debug)
3423                 addlog("\n");
3424
3425         /* pass 2: parse option values */
3426         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3427         if (debug)
3428                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
3429                     SPP_ARGS(ifp));
3430         p = (void*) (h+1);
3431         len = origlen;
3432         type = CONF_ACK;
3433         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3434                 if (debug)
3435                         addlog(" %s", sppp_ipv6cp_opt_name(*p));
3436                 switch (*p) {
3437 #ifdef notyet
3438                 case IPV6CP_OPT_COMPRESSION:
3439                         continue;
3440 #endif
3441                 case IPV6CP_OPT_IFID:
3442                         bzero(&desiredaddr, sizeof(desiredaddr));
3443                         bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3444                         collision = (bcmp(&desiredaddr.s6_addr[8],
3445                                           &myaddr.s6_addr[8], 8) == 0);
3446                         nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3447
3448                         desiredaddr.s6_addr16[0] = htons(0xfe80);
3449                         desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3450
3451                         if (!collision && !nohisaddr) {
3452                                 /* no collision, hisaddr known - Conf-Ack */
3453                                 type = CONF_ACK;
3454
3455                                 if (debug) {
3456                                         addlog(" %s [%s]",
3457                                                ip6_sprintf(&desiredaddr),
3458                                                sppp_cp_type_name(type));
3459                                 }
3460                                 continue;
3461                         }
3462
3463                         bzero(&suggestaddr, sizeof(&suggestaddr));
3464                         if (collision && nohisaddr) {
3465                                 /* collision, hisaddr unknown - Conf-Rej */
3466                                 type = CONF_REJ;
3467                                 bzero(&p[2], 8);
3468                         } else {
3469                                 /*
3470                                  * - no collision, hisaddr unknown, or
3471                                  * - collision, hisaddr known
3472                                  * Conf-Nak, suggest hisaddr
3473                                  */
3474                                 type = CONF_NAK;
3475                                 sppp_suggest_ip6_addr(sp, &suggestaddr);
3476                                 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3477                         }
3478                         if (debug)
3479                                 addlog(" %s [%s]", ip6_sprintf(&desiredaddr),
3480                                        sppp_cp_type_name(type));
3481                         break;
3482                 }
3483                 /* Add the option to nak'ed list. */
3484                 bcopy (p, r, p[1]);
3485                 r += p[1];
3486                 rlen += p[1];
3487         }
3488
3489         if (rlen == 0 && type == CONF_ACK) {
3490                 if (debug)
3491                         addlog(" send %s\n", sppp_cp_type_name(type));
3492                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
3493         } else {
3494 #ifdef DIAGNOSTIC
3495                 if (type == CONF_ACK)
3496                         panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3497 #endif
3498
3499                 if (debug) {
3500                         addlog(" send %s suggest %s\n",
3501                                sppp_cp_type_name(type), ip6_sprintf(&suggestaddr));
3502                 }
3503                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3504         }
3505
3506  end:
3507         free (buf, M_TEMP);
3508         return (rlen == 0);
3509 }
3510
3511 /*
3512  * Analyze the IPv6CP Configure-Reject option list, and adjust our
3513  * negotiation.
3514  */
3515 static void
3516 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3517 {
3518         u_char *buf, *p;
3519         struct ifnet *ifp = &sp->pp_if;
3520         int debug = ifp->if_flags & IFF_DEBUG;
3521
3522         len -= 4;
3523         buf = malloc (len, M_TEMP, M_INTWAIT);
3524
3525         if (debug)
3526                 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
3527                     SPP_ARGS(ifp));
3528
3529         p = (void*) (h+1);
3530         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3531                 if (debug)
3532                         addlog(" %s", sppp_ipv6cp_opt_name(*p));
3533                 switch (*p) {
3534                 case IPV6CP_OPT_IFID:
3535                         /*
3536                          * Peer doesn't grok address option.  This is
3537                          * bad.  XXX  Should we better give up here?
3538                          */
3539                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3540                         break;
3541 #ifdef notyet
3542                 case IPV6CP_OPT_COMPRESS:
3543                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3544                         break;
3545 #endif
3546                 }
3547         }
3548         if (debug)
3549                 addlog("\n");
3550         free (buf, M_TEMP);
3551         return;
3552 }
3553
3554 /*
3555  * Analyze the IPv6CP Configure-NAK option list, and adjust our
3556  * negotiation.
3557  */
3558 static void
3559 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3560 {
3561         u_char *buf, *p;
3562         struct ifnet *ifp = &sp->pp_if;
3563         int debug = ifp->if_flags & IFF_DEBUG;
3564         struct in6_addr suggestaddr;
3565
3566         len -= 4;
3567         buf = malloc (len, M_TEMP, M_INTWAIT);
3568
3569         if (debug)
3570                 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:",
3571                     SPP_ARGS(ifp));
3572
3573         p = (void*) (h+1);
3574         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3575                 if (debug)
3576                         addlog(" %s", sppp_ipv6cp_opt_name(*p));
3577                 switch (*p) {
3578                 case IPV6CP_OPT_IFID:
3579                         /*
3580                          * Peer doesn't like our local ifid.  See
3581                          * if we can do something for him.  We'll drop
3582                          * him our address then.
3583                          */
3584                         if (len < 10 || p[1] != 10)
3585                                 break;
3586                         bzero(&suggestaddr, sizeof(suggestaddr));
3587                         suggestaddr.s6_addr16[0] = htons(0xfe80);
3588                         suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3589                         bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3590
3591                         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3592                         if (debug)
3593                                 addlog(" [suggestaddr %s]",
3594                                        ip6_sprintf(&suggestaddr));
3595 #ifdef IPV6CP_MYIFID_DYN
3596                         /*
3597                          * When doing dynamic address assignment,
3598                          * we accept his offer.
3599                          */
3600                         if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3601                                 struct in6_addr lastsuggest;
3602                                 /*
3603                                  * If <suggested myaddr from peer> equals to
3604                                  * <hisaddr we have suggested last time>,
3605                                  * we have a collision.  generate new random
3606                                  * ifid.
3607                                  */
3608                                 sppp_suggest_ip6_addr(&lastsuggest);
3609                                 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
3610                                                        lastsuggest)) {
3611                                         if (debug)
3612                                                 addlog(" [random]");
3613                                         sppp_gen_ip6_addr(sp, &suggestaddr);
3614                                 }
3615                                 sppp_set_ip6_addr(sp, &suggestaddr, 0);
3616                                 if (debug)
3617                                         addlog(" [agree]");
3618                                 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3619                         }
3620 #else
3621                         /*
3622                          * Since we do not do dynamic address assignment,
3623                          * we ignore it and thus continue to negotiate
3624                          * our already existing value.  This can possibly
3625                          * go into infinite request-reject loop.
3626                          *
3627                          * This is not likely because we normally use
3628                          * ifid based on MAC-address.
3629                          * If you have no ethernet card on the node, too bad.
3630                          * XXX should we use fail_counter?
3631                          */
3632 #endif
3633                         break;
3634 #ifdef notyet
3635                 case IPV6CP_OPT_COMPRESS:
3636                         /*
3637                          * Peer wants different compression parameters.
3638                          */
3639                         break;
3640 #endif
3641                 }
3642         }
3643         if (debug)
3644                 addlog("\n");
3645         free (buf, M_TEMP);
3646         return;
3647 }
3648 static void
3649 sppp_ipv6cp_tlu(struct sppp *sp)
3650 {
3651         /* we are up - notify isdn daemon */
3652         if (sp->pp_con)
3653                 sp->pp_con(sp);
3654 }
3655
3656 static void
3657 sppp_ipv6cp_tld(struct sppp *sp)
3658 {
3659 }
3660
3661 static void
3662 sppp_ipv6cp_tls(struct sppp *sp)
3663 {
3664         /* indicate to LCP that it must stay alive */
3665         sp->lcp.protos |= (1 << IDX_IPV6CP);
3666 }
3667
3668 static void
3669 sppp_ipv6cp_tlf(struct sppp *sp)
3670 {
3671
3672 #if 0   /* need #if 0 to close IPv6CP properly */
3673         /* we no longer need LCP */
3674         sp->lcp.protos &= ~(1 << IDX_IPV6CP);
3675         sppp_lcp_check_and_close(sp);
3676 #endif
3677 }
3678
3679 static void
3680 sppp_ipv6cp_scr(struct sppp *sp)
3681 {
3682         char opt[10 /* ifid */ + 4 /* compression, minimum */];
3683         struct in6_addr ouraddr;
3684         int i = 0;
3685
3686         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
3687                 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
3688                 opt[i++] = IPV6CP_OPT_IFID;
3689                 opt[i++] = 10;
3690                 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
3691                 i += 8;
3692         }
3693
3694 #ifdef notyet
3695         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
3696                 opt[i++] = IPV6CP_OPT_COMPRESSION;
3697                 opt[i++] = 4;
3698                 opt[i++] = 0;   /* TBD */
3699                 opt[i++] = 0;   /* TBD */
3700                 /* variable length data may follow */
3701         }
3702 #endif
3703
3704         sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
3705         sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt);
3706 }
3707 #else /*INET6*/
3708 static void sppp_ipv6cp_init(struct sppp *sp)
3709 {
3710 }
3711
3712 static void sppp_ipv6cp_up(struct sppp *sp)
3713 {
3714 }
3715
3716 static void sppp_ipv6cp_down(struct sppp *sp)
3717 {
3718 }
3719
3720
3721 static void sppp_ipv6cp_open(struct sppp *sp)
3722 {
3723 }
3724
3725 static void sppp_ipv6cp_close(struct sppp *sp)
3726 {
3727 }
3728
3729 static void sppp_ipv6cp_TO(void *sp)
3730 {
3731 }
3732
3733 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3734 {
3735         return 0;
3736 }
3737
3738 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3739 {
3740 }
3741
3742 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3743 {
3744 }
3745
3746 static void sppp_ipv6cp_tlu(struct sppp *sp)
3747 {
3748 }
3749
3750 static void sppp_ipv6cp_tld(struct sppp *sp)
3751 {
3752 }
3753
3754 static void sppp_ipv6cp_tls(struct sppp *sp)
3755 {
3756 }
3757
3758 static void sppp_ipv6cp_tlf(struct sppp *sp)
3759 {
3760 }
3761
3762 static void sppp_ipv6cp_scr(struct sppp *sp)
3763 {
3764 }
3765 #endif /*INET6*/
3766
3767 /*
3768  *--------------------------------------------------------------------------*
3769  *                                                                          *
3770  *                        The CHAP implementation.                          *
3771  *                                                                          *
3772  *--------------------------------------------------------------------------*
3773  */
3774
3775 /*
3776  * The authentication protocols don't employ a full-fledged state machine as
3777  * the control protocols do, since they do have Open and Close events, but
3778  * not Up and Down, nor are they explicitly terminated.  Also, use of the
3779  * authentication protocols may be different in both directions (this makes
3780  * sense, think of a machine that never accepts incoming calls but only
3781  * calls out, it doesn't require the called party to authenticate itself).
3782  *
3783  * Our state machine for the local authentication protocol (we are requesting
3784  * the peer to authenticate) looks like:
3785  *
3786  *                                                  RCA-
3787  *            +--------------------------------------------+
3788  *            V                                     scn,tld|
3789  *        +--------+                           Close   +---------+ RCA+
3790  *        |        |<----------------------------------|         |------+
3791  *   +--->| Closed |                            TO*    | Opened  | sca  |
3792  *   |    |        |-----+                     +-------|         |<-----+
3793  *   |    +--------+ irc |                     |       +---------+
3794  *   |      ^            |                     |           ^
3795  *   |      |            |                     |           |
3796  *   |      |            |                     |           |
3797  *   |   TO-|            |                     |           |
3798  *   |      |tld  TO+    V                     |           |
3799  *   |      |   +------->+                     |           |
3800  *   |      |   |        |                     |           |
3801  *   |    +--------+     V                     |           |
3802  *   |    |        |<----+<--------------------+           |
3803  *   |    | Req-   | scr                                   |
3804  *   |    | Sent   |                                       |
3805  *   |    |        |                                       |
3806  *   |    +--------+                                       |
3807  *   | RCA- |   | RCA+                                     |
3808  *   +------+   +------------------------------------------+
3809  *   scn,tld      sca,irc,ict,tlu
3810  *
3811  *
3812  *   with:
3813  *
3814  *      Open:   LCP reached authentication phase
3815  *      Close:  LCP reached terminate phase
3816  *
3817  *      RCA+:   received reply (pap-req, chap-response), acceptable
3818  *      RCN:    received reply (pap-req, chap-response), not acceptable
3819  *      TO+:    timeout with restart counter >= 0
3820  *      TO-:    timeout with restart counter < 0
3821  *      TO*:    reschedule timeout for CHAP
3822  *
3823  *      scr:    send request packet (none for PAP, chap-challenge)
3824  *      sca:    send ack packet (pap-ack, chap-success)
3825  *      scn:    send nak packet (pap-nak, chap-failure)
3826  *      ict:    initialize re-challenge timer (CHAP only)
3827  *
3828  *      tlu:    this-layer-up, LCP reaches network phase
3829  *      tld:    this-layer-down, LCP enters terminate phase
3830  *
3831  * Note that in CHAP mode, after sending a new challenge, while the state
3832  * automaton falls back into Req-Sent state, it doesn't signal a tld
3833  * event to LCP, so LCP remains in network phase.  Only after not getting
3834  * any response (or after getting an unacceptable response), CHAP closes,
3835  * causing LCP to enter terminate phase.
3836  *
3837  * With PAP, there is no initial request that can be sent.  The peer is
3838  * expected to send one based on the successful negotiation of PAP as
3839  * the authentication protocol during the LCP option negotiation.
3840  *
3841  * Incoming authentication protocol requests (remote requests
3842  * authentication, we are peer) don't employ a state machine at all,
3843  * they are simply answered.  Some peers [Ascend P50 firmware rev
3844  * 4.50] react allergically when sending IPCP requests while they are
3845  * still in authentication phase (thereby violating the standard that
3846  * demands that these NCP packets are to be discarded), so we keep
3847  * track of the peer demanding us to authenticate, and only proceed to
3848  * phase network once we've seen a positive acknowledge for the
3849  * authentication.
3850  */
3851
3852 /*
3853  * Handle incoming CHAP packets.
3854  */
3855 void
3856 sppp_chap_input(struct sppp *sp, struct mbuf *m)
3857 {
3858         STDDCL;
3859         struct lcp_header *h;
3860         int len, x;
3861         u_char *value, *name, digest[AUTHKEYLEN], dsize;
3862         int value_len, name_len;
3863         MD5_CTX ctx;
3864
3865         len = m->m_pkthdr.len;
3866         if (len < 4) {
3867                 if (debug)
3868                         log(LOG_DEBUG,
3869                             SPP_FMT "chap invalid packet length: %d bytes\n",
3870                             SPP_ARGS(ifp), len);
3871                 return;
3872         }
3873         h = mtod (m, struct lcp_header*);
3874         if (len > ntohs (h->len))
3875                 len = ntohs (h->len);
3876
3877         switch (h->type) {
3878         /* challenge, failure and success are his authproto */
3879         case CHAP_CHALLENGE:
3880                 value = 1 + (u_char*)(h+1);
3881                 value_len = value[-1];
3882                 name = value + value_len;
3883                 name_len = len - value_len - 5;
3884                 if (name_len < 0) {
3885                         if (debug) {
3886                                 log(LOG_DEBUG,
3887                                     SPP_FMT "chap corrupted challenge "
3888                                     "<%s id=0x%x len=%d",
3889                                     SPP_ARGS(ifp),
3890                                     sppp_auth_type_name(PPP_CHAP, h->type),
3891                                     h->ident, ntohs(h->len));
3892                                 sppp_print_bytes((u_char*) (h+1), len-4);
3893                                 addlog(">\n");
3894                         }
3895                         break;
3896                 }
3897
3898                 if (debug) {
3899                         log(LOG_DEBUG,
3900                             SPP_FMT "chap input <%s id=0x%x len=%d name=",
3901                             SPP_ARGS(ifp),
3902                             sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
3903                             ntohs(h->len));
3904                         sppp_print_string((char*) name, name_len);
3905                         addlog(" value-size=%d value=", value_len);
3906                         sppp_print_bytes(value, value_len);
3907                         addlog(">\n");
3908                 }
3909
3910                 /* Compute reply value. */
3911                 MD5Init(&ctx);
3912                 MD5Update(&ctx, &h->ident, 1);
3913                 MD5Update(&ctx, sp->myauth.secret,
3914                           sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
3915                 MD5Update(&ctx, value, value_len);
3916                 MD5Final(digest, &ctx);
3917                 dsize = sizeof digest;
3918
3919                 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
3920                                sizeof dsize, (const char *)&dsize,
3921                                sizeof digest, digest,
3922                                (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
3923                                sp->myauth.name,
3924                                0);
3925                 break;
3926
3927         case CHAP_SUCCESS:
3928                 if (debug) {
3929                         log(LOG_DEBUG, SPP_FMT "chap success",
3930                             SPP_ARGS(ifp));
3931                         if (len > 4) {
3932                                 addlog(": ");
3933                                 sppp_print_string((char*)(h + 1), len - 4);
3934                         }
3935                         addlog("\n");
3936                 }
3937                 x = splimp();
3938                 sp->pp_flags &= ~PP_NEEDAUTH;
3939                 if (sp->myauth.proto == PPP_CHAP &&
3940                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
3941                     (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
3942                         /*
3943                          * We are authenticator for CHAP but didn't
3944                          * complete yet.  Leave it to tlu to proceed
3945                          * to network phase.
3946                          */
3947                         splx(x);
3948                         break;
3949                 }
3950                 splx(x);
3951                 sppp_phase_network(sp);
3952                 break;
3953
3954         case CHAP_FAILURE:
3955                 if (debug) {
3956                         log(LOG_INFO, SPP_FMT "chap failure",
3957                             SPP_ARGS(ifp));
3958                         if (len > 4) {
3959                                 addlog(": ");
3960                                 sppp_print_string((char*)(h + 1), len - 4);
3961                         }
3962                         addlog("\n");
3963                 } else
3964                         log(LOG_INFO, SPP_FMT "chap failure\n",
3965                             SPP_ARGS(ifp));
3966                 /* await LCP shutdown by authenticator */
3967                 break;
3968
3969         /* response is my authproto */
3970         case CHAP_RESPONSE:
3971                 value = 1 + (u_char*)(h+1);
3972                 value_len = value[-1];
3973                 name = value + value_len;
3974                 name_len = len - value_len - 5;
3975                 if (name_len < 0) {
3976                         if (debug) {
3977                                 log(LOG_DEBUG,
3978                                     SPP_FMT "chap corrupted response "
3979                                     "<%s id=0x%x len=%d",
3980                                     SPP_ARGS(ifp),
3981                                     sppp_auth_type_name(PPP_CHAP, h->type),
3982                                     h->ident, ntohs(h->len));
3983                                 sppp_print_bytes((u_char*)(h+1), len-4);
3984                                 addlog(">\n");
3985                         }
3986                         break;
3987                 }
3988                 if (h->ident != sp->confid[IDX_CHAP]) {
3989                         if (debug)
3990                                 log(LOG_DEBUG,
3991                                     SPP_FMT "chap dropping response for old ID "
3992                                     "(got %d, expected %d)\n",
3993                                     SPP_ARGS(ifp),
3994                                     h->ident, sp->confid[IDX_CHAP]);
3995                         break;
3996                 }
3997                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
3998                     || bcmp(name, sp->hisauth.name, name_len) != 0) {
3999                         log(LOG_INFO, SPP_FMT "chap response, his name ",
4000                             SPP_ARGS(ifp));
4001                         sppp_print_string(name, name_len);
4002                         addlog(" != expected ");
4003                         sppp_print_string(sp->hisauth.name,
4004                                           sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
4005                         addlog("\n");
4006                 }
4007                 if (debug) {
4008                         log(LOG_DEBUG, SPP_FMT "chap input(%s) "
4009                             "<%s id=0x%x len=%d name=",
4010                             SPP_ARGS(ifp),
4011                             sppp_state_name(sp->state[IDX_CHAP]),
4012                             sppp_auth_type_name(PPP_CHAP, h->type),
4013                             h->ident, ntohs (h->len));
4014                         sppp_print_string((char*)name, name_len);
4015                         addlog(" value-size=%d value=", value_len);
4016                         sppp_print_bytes(value, value_len);
4017                         addlog(">\n");
4018                 }
4019                 if (value_len != AUTHKEYLEN) {
4020                         if (debug)
4021                                 log(LOG_DEBUG,
4022                                     SPP_FMT "chap bad hash value length: "
4023                                     "%d bytes, should be %d\n",
4024                                     SPP_ARGS(ifp), value_len,
4025                                     AUTHKEYLEN);
4026                         break;
4027                 }
4028
4029                 MD5Init(&ctx);
4030                 MD5Update(&ctx, &h->ident, 1);
4031                 MD5Update(&ctx, sp->hisauth.secret,
4032                           sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
4033                 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
4034                 MD5Final(digest, &ctx);
4035
4036 #define FAILMSG "Failed..."
4037 #define SUCCMSG "Welcome!"
4038
4039                 if (value_len != sizeof digest ||
4040                     bcmp(digest, value, value_len) != 0) {
4041                         /* action scn, tld */
4042                         sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
4043                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4044                                        0);
4045                         chap.tld(sp);
4046                         break;
4047                 }
4048                 /* action sca, perhaps tlu */
4049                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
4050                     sp->state[IDX_CHAP] == STATE_OPENED)
4051                         sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
4052                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4053                                        0);
4054                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
4055                         sppp_cp_change_state(&chap, sp, STATE_OPENED);
4056                         chap.tlu(sp);
4057                 }
4058                 break;
4059
4060         default:
4061                 /* Unknown CHAP packet type -- ignore. */
4062                 if (debug) {
4063                         log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
4064                             "<0x%x id=0x%xh len=%d",
4065                             SPP_ARGS(ifp),
4066                             sppp_state_name(sp->state[IDX_CHAP]),
4067                             h->type, h->ident, ntohs(h->len));
4068                         sppp_print_bytes((u_char*)(h+1), len-4);
4069                         addlog(">\n");
4070                 }
4071                 break;
4072
4073         }
4074 }
4075
4076 static void
4077 sppp_chap_init(struct sppp *sp)
4078 {
4079         /* Chap doesn't have STATE_INITIAL at all. */
4080         sp->state[IDX_CHAP] = STATE_CLOSED;
4081         sp->fail_counter[IDX_CHAP] = 0;
4082         sp->pp_seq[IDX_CHAP] = 0;
4083         sp->pp_rseq[IDX_CHAP] = 0;
4084 #if defined(__DragonFly__)
4085         callout_init(&sp->timeout[IDX_CHAP]);
4086 #endif
4087 }
4088
4089 static void
4090 sppp_chap_open(struct sppp *sp)
4091 {
4092         if (sp->myauth.proto == PPP_CHAP &&
4093             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4094                 /* we are authenticator for CHAP, start it */
4095                 chap.scr(sp);
4096                 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4097                 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4098         }
4099         /* nothing to be done if we are peer, await a challenge */
4100 }
4101
4102 static void
4103 sppp_chap_close(struct sppp *sp)
4104 {
4105         if (sp->state[IDX_CHAP] != STATE_CLOSED)
4106                 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4107 }
4108
4109 static void
4110 sppp_chap_TO(void *cookie)
4111 {
4112         struct sppp *sp = (struct sppp *)cookie;
4113         STDDCL;
4114         int s;
4115
4116         s = splimp();
4117         if (debug)
4118                 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
4119                     SPP_ARGS(ifp),
4120                     sppp_state_name(sp->state[IDX_CHAP]),
4121                     sp->rst_counter[IDX_CHAP]);
4122
4123         if (--sp->rst_counter[IDX_CHAP] < 0)
4124                 /* TO- event */
4125                 switch (sp->state[IDX_CHAP]) {
4126                 case STATE_REQ_SENT:
4127                         chap.tld(sp);
4128                         sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4129                         break;
4130                 }
4131         else
4132                 /* TO+ (or TO*) event */
4133                 switch (sp->state[IDX_CHAP]) {
4134                 case STATE_OPENED:
4135                         /* TO* event */
4136                         sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4137                         /* fall through */
4138                 case STATE_REQ_SENT:
4139                         chap.scr(sp);
4140                         /* sppp_cp_change_state() will restart the timer */
4141                         sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4142                         break;
4143                 }
4144
4145         splx(s);
4146 }
4147
4148 static void
4149 sppp_chap_tlu(struct sppp *sp)
4150 {
4151         STDDCL;
4152         int i, x;
4153
4154         i = 0;
4155         sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4156
4157         /*
4158          * Some broken CHAP implementations (Conware CoNet, firmware
4159          * 4.0.?) don't want to re-authenticate their CHAP once the
4160          * initial challenge-response exchange has taken place.
4161          * Provide for an option to avoid rechallenges.
4162          */
4163         if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
4164                 /*
4165                  * Compute the re-challenge timeout.  This will yield
4166                  * a number between 300 and 810 seconds.
4167                  */
4168                 i = 300 + ((unsigned)(random() & 0xff00) >> 7);
4169                 callout_reset(&sp->timeout[IDX_CHAP], i * hz, chap.TO, sp);
4170         }
4171
4172         if (debug) {
4173                 log(LOG_DEBUG,
4174                     SPP_FMT "chap %s, ",
4175                     SPP_ARGS(ifp),
4176                     sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
4177                 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
4178                         addlog("next re-challenge in %d seconds\n", i);
4179                 else
4180                         addlog("re-challenging supressed\n");
4181         }
4182
4183         x = splimp();
4184         /* indicate to LCP that we need to be closed down */
4185         sp->lcp.protos |= (1 << IDX_CHAP);
4186
4187         if (sp->pp_flags & PP_NEEDAUTH) {
4188                 /*
4189                  * Remote is authenticator, but his auth proto didn't
4190                  * complete yet.  Defer the transition to network
4191                  * phase.
4192                  */
4193                 splx(x);
4194                 return;
4195         }
4196         splx(x);
4197
4198         /*
4199          * If we are already in phase network, we are done here.  This
4200          * is the case if this is a dummy tlu event after a re-challenge.
4201          */
4202         if (sp->pp_phase != PHASE_NETWORK)
4203                 sppp_phase_network(sp);
4204 }
4205
4206 static void
4207 sppp_chap_tld(struct sppp *sp)
4208 {
4209         STDDCL;
4210
4211         if (debug)
4212                 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
4213         callout_stop(&sp->timeout[IDX_CHAP]);
4214         sp->lcp.protos &= ~(1 << IDX_CHAP);
4215
4216         lcp.Close(sp);
4217 }
4218
4219 static void
4220 sppp_chap_scr(struct sppp *sp)
4221 {
4222         u_long *ch, seed;
4223         u_char clen;
4224
4225         /* Compute random challenge. */
4226         ch = (u_long *)sp->myauth.challenge;
4227 #if defined(__DragonFly__)
4228         read_random(&seed, sizeof seed);
4229 #else
4230         {
4231         struct timeval tv;
4232         microtime(&tv);
4233         seed = tv.tv_sec ^ tv.tv_usec;
4234         }
4235 #endif
4236         ch[0] = seed ^ random();
4237         ch[1] = seed ^ random();
4238         ch[2] = seed ^ random();
4239         ch[3] = seed ^ random();
4240         clen = AUTHKEYLEN;
4241
4242         sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP];
4243
4244         sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
4245                        sizeof clen, (const char *)&clen,
4246                        (size_t)AUTHKEYLEN, sp->myauth.challenge,
4247                        (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4248                        sp->myauth.name,
4249                        0);
4250 }
4251
4252 /*
4253  *--------------------------------------------------------------------------*
4254  *                                                                          *
4255  *                        The PAP implementation.                           *
4256  *                                                                          *
4257  *--------------------------------------------------------------------------*
4258  */
4259 /*
4260  * For PAP, we need to keep a little state also if we are the peer, not the
4261  * authenticator.  This is since we don't get a request to authenticate, but
4262  * have to repeatedly authenticate ourself until we got a response (or the
4263  * retry counter is expired).
4264  */
4265
4266 /*
4267  * Handle incoming PAP packets.  */
4268 static void
4269 sppp_pap_input(struct sppp *sp, struct mbuf *m)
4270 {
4271         STDDCL;
4272         struct lcp_header *h;
4273         int len, x;
4274         u_char *name, *passwd, mlen;
4275         int name_len, passwd_len;
4276
4277         len = m->m_pkthdr.len;
4278         if (len < 5) {
4279                 if (debug)
4280                         log(LOG_DEBUG,
4281                             SPP_FMT "pap invalid packet length: %d bytes\n",
4282                             SPP_ARGS(ifp), len);
4283                 return;
4284         }
4285         h = mtod (m, struct lcp_header*);
4286         if (len > ntohs (h->len))
4287                 len = ntohs (h->len);
4288         switch (h->type) {
4289         /* PAP request is my authproto */
4290         case PAP_REQ:
4291                 name = 1 + (u_char*)(h+1);
4292                 name_len = name[-1];
4293                 passwd = name + name_len + 1;
4294                 if (name_len > len - 6 ||
4295                     (passwd_len = passwd[-1]) > len - 6 - name_len) {
4296                         if (debug) {
4297                                 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4298                                     "<%s id=0x%x len=%d",
4299                                     SPP_ARGS(ifp),
4300                                     sppp_auth_type_name(PPP_PAP, h->type),
4301                                     h->ident, ntohs(h->len));
4302                                 sppp_print_bytes((u_char*)(h+1), len-4);
4303                                 addlog(">\n");
4304                         }
4305                         break;
4306                 }
4307                 if (debug) {
4308                         log(LOG_DEBUG, SPP_FMT "pap input(%s) "
4309                             "<%s id=0x%x len=%d name=",
4310                             SPP_ARGS(ifp),
4311                             sppp_state_name(sp->state[IDX_PAP]),
4312                             sppp_auth_type_name(PPP_PAP, h->type),
4313                             h->ident, ntohs(h->len));
4314                         sppp_print_string((char*)name, name_len);
4315                         addlog(" passwd=");
4316                         sppp_print_string((char*)passwd, passwd_len);
4317                         addlog(">\n");
4318                 }
4319                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) ||
4320                     passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) ||
4321                     bcmp(name, sp->hisauth.name, name_len) != 0 ||
4322                     bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
4323                         /* action scn, tld */
4324                         mlen = sizeof(FAILMSG) - 1;
4325                         sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
4326                                        sizeof mlen, (const char *)&mlen,
4327                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4328                                        0);
4329                         pap.tld(sp);
4330                         break;
4331                 }
4332                 /* action sca, perhaps tlu */
4333                 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
4334                     sp->state[IDX_PAP] == STATE_OPENED) {
4335                         mlen = sizeof(SUCCMSG) - 1;
4336                         sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
4337                                        sizeof mlen, (const char *)&mlen,
4338                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4339                                        0);
4340                 }
4341                 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
4342                         sppp_cp_change_state(&pap, sp, STATE_OPENED);
4343                         pap.tlu(sp);
4344                 }
4345                 break;
4346
4347         /* ack and nak are his authproto */
4348         case PAP_ACK:
4349                 callout_stop(&sp->pap_my_to);
4350                 if (debug) {
4351                         log(LOG_DEBUG, SPP_FMT "pap success",
4352                             SPP_ARGS(ifp));
4353                         name_len = *((char *)h);
4354                         if (len > 5 && name_len) {
4355                                 addlog(": ");
4356                                 sppp_print_string((char*)(h+1), name_len);
4357                         }
4358                         addlog("\n");
4359                 }
4360                 x = splimp();
4361                 sp->pp_flags &= ~PP_NEEDAUTH;
4362                 if (sp->myauth.proto == PPP_PAP &&
4363                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4364                     (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
4365                         /*
4366                          * We are authenticator for PAP but didn't
4367                          * complete yet.  Leave it to tlu to proceed
4368                          * to network phase.
4369                          */
4370                         splx(x);
4371                         break;
4372                 }
4373                 splx(x);
4374                 sppp_phase_network(sp);
4375                 break;
4376
4377         case PAP_NAK:
4378                 callout_stop(&sp->pap_my_to);
4379                 if (debug) {
4380                         log(LOG_INFO, SPP_FMT "pap failure",
4381                             SPP_ARGS(ifp));
4382                         name_len = *((char *)h);
4383                         if (len > 5 && name_len) {
4384                                 addlog(": ");
4385                                 sppp_print_string((char*)(h+1), name_len);
4386                         }
4387                         addlog("\n");
4388                 } else
4389                         log(LOG_INFO, SPP_FMT "pap failure\n",
4390                             SPP_ARGS(ifp));
4391                 /* await LCP shutdown by authenticator */
4392                 break;
4393
4394         default:
4395                 /* Unknown PAP packet type -- ignore. */
4396                 if (debug) {
4397                         log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4398                             "<0x%x id=0x%x len=%d",
4399                             SPP_ARGS(ifp),
4400                             h->type, h->ident, ntohs(h->len));
4401                         sppp_print_bytes((u_char*)(h+1), len-4);
4402                         addlog(">\n");
4403                 }
4404                 break;
4405
4406         }
4407 }
4408
4409 static void
4410 sppp_pap_init(struct sppp *sp)
4411 {
4412         /* PAP doesn't have STATE_INITIAL at all. */
4413         sp->state[IDX_PAP] = STATE_CLOSED;
4414         sp->fail_counter[IDX_PAP] = 0;
4415         sp->pp_seq[IDX_PAP] = 0;
4416         sp->pp_rseq[IDX_PAP] = 0;
4417 #if defined(__DragonFly__)
4418         callout_init(&sp->timeout[IDX_PAP]);
4419         callout_init(&sp->pap_my_to);
4420 #endif
4421 }
4422
4423 static void
4424 sppp_pap_open(struct sppp *sp)
4425 {
4426         if (sp->hisauth.proto == PPP_PAP &&
4427             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4428                 /* we are authenticator for PAP, start our timer */
4429                 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4430                 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4431         }
4432         if (sp->myauth.proto == PPP_PAP) {
4433                 /* we are peer, send a request, and start a timer */
4434                 pap.scr(sp);
4435                 callout_reset(&sp->pap_my_to, sp->lcp.timeout,
4436                                 sppp_pap_my_TO, sp);
4437         }
4438 }
4439
4440 static void
4441 sppp_pap_close(struct sppp *sp)
4442 {
4443         if (sp->state[IDX_PAP] != STATE_CLOSED)
4444                 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4445 }
4446
4447 /*
4448  * That's the timeout routine if we are authenticator.  Since the
4449  * authenticator is basically passive in PAP, we can't do much here.
4450  */
4451 static void
4452 sppp_pap_TO(void *cookie)
4453 {
4454         struct sppp *sp = (struct sppp *)cookie;
4455         STDDCL;
4456         int s;
4457
4458         s = splimp();
4459         if (debug)
4460                 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
4461                     SPP_ARGS(ifp),
4462                     sppp_state_name(sp->state[IDX_PAP]),
4463                     sp->rst_counter[IDX_PAP]);
4464
4465         if (--sp->rst_counter[IDX_PAP] < 0)
4466                 /* TO- event */
4467                 switch (sp->state[IDX_PAP]) {
4468                 case STATE_REQ_SENT:
4469                         pap.tld(sp);
4470                         sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4471                         break;
4472                 }
4473         else
4474                 /* TO+ event, not very much we could do */
4475                 switch (sp->state[IDX_PAP]) {
4476                 case STATE_REQ_SENT:
4477                         /* sppp_cp_change_state() will restart the timer */
4478                         sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4479                         break;
4480                 }
4481
4482         splx(s);
4483 }
4484
4485 /*
4486  * That's the timeout handler if we are peer.  Since the peer is active,
4487  * we need to retransmit our PAP request since it is apparently lost.
4488  * XXX We should impose a max counter.
4489  */
4490 static void
4491 sppp_pap_my_TO(void *cookie)
4492 {
4493         struct sppp *sp = (struct sppp *)cookie;
4494         STDDCL;
4495
4496         if (debug)
4497                 log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
4498                     SPP_ARGS(ifp));
4499
4500         pap.scr(sp);
4501 }
4502
4503 static void
4504 sppp_pap_tlu(struct sppp *sp)
4505 {
4506         STDDCL;
4507         int x;
4508
4509         sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4510
4511         if (debug)
4512                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
4513                     SPP_ARGS(ifp), pap.name);
4514
4515         x = splimp();
4516         /* indicate to LCP that we need to be closed down */
4517         sp->lcp.protos |= (1 << IDX_PAP);
4518
4519         if (sp->pp_flags & PP_NEEDAUTH) {
4520                 /*
4521                  * Remote is authenticator, but his auth proto didn't
4522                  * complete yet.  Defer the transition to network
4523                  * phase.
4524                  */
4525                 splx(x);
4526                 return;
4527         }
4528         splx(x);
4529         sppp_phase_network(sp);
4530 }
4531
4532 static void
4533 sppp_pap_tld(struct sppp *sp)
4534 {
4535         STDDCL;
4536
4537         if (debug)
4538                 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
4539         callout_stop(&sp->timeout[IDX_PAP]);
4540         callout_stop(&sp->pap_my_to);
4541         sp->lcp.protos &= ~(1 << IDX_PAP);
4542
4543         lcp.Close(sp);
4544 }
4545
4546 static void
4547 sppp_pap_scr(struct sppp *sp)
4548 {
4549         u_char idlen, pwdlen;
4550
4551         sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP];
4552         pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
4553         idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
4554
4555         sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
4556                        sizeof idlen, (const char *)&idlen,
4557                        (size_t)idlen, sp->myauth.name,
4558                        sizeof pwdlen, (const char *)&pwdlen,
4559                        (size_t)pwdlen, sp->myauth.secret,
4560                        0);
4561 }
4562
4563 /*
4564  * Random miscellaneous functions.
4565  */
4566
4567 /*
4568  * Send a PAP or CHAP proto packet.
4569  *
4570  * Varadic function, each of the elements for the ellipsis is of type
4571  * ``size_t mlen, const u_char *msg''.  Processing will stop iff
4572  * mlen == 0.
4573  * NOTE: never declare variadic functions with types subject to type
4574  * promotion (i.e. u_char). This is asking for big trouble depending
4575  * on the architecture you are on...
4576  */
4577
4578 static void
4579 sppp_auth_send(const struct cp *cp, struct sppp *sp,
4580                unsigned int type, unsigned int id,
4581                ...)
4582 {
4583         STDDCL;
4584         struct ppp_header *h;
4585         struct lcp_header *lh;
4586         struct mbuf *m;
4587         u_char *p;
4588         int len;
4589         unsigned int mlen;
4590         const char *msg;
4591         __va_list ap;
4592
4593         MGETHDR (m, MB_DONTWAIT, MT_DATA);
4594         if (! m)
4595                 return;
4596         m->m_pkthdr.rcvif = 0;
4597
4598         h = mtod (m, struct ppp_header*);
4599         h->address = PPP_ALLSTATIONS;           /* broadcast address */
4600         h->control = PPP_UI;                    /* Unnumbered Info */
4601         h->protocol = htons(cp->proto);
4602
4603         lh = (struct lcp_header*)(h + 1);
4604         lh->type = type;
4605         lh->ident = id;
4606         p = (u_char*) (lh+1);
4607
4608         __va_start(ap, id);
4609         len = 0;
4610
4611         while ((mlen = (unsigned int)__va_arg(ap, size_t)) != 0) {
4612                 msg = __va_arg(ap, const char *);
4613                 len += mlen;
4614                 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
4615                         __va_end(ap);
4616                         m_freem(m);
4617                         return;
4618                 }
4619
4620                 bcopy(msg, p, mlen);
4621                 p += mlen;
4622         }
4623         __va_end(ap);
4624
4625         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
4626         lh->len = htons (LCP_HEADER_LEN + len);
4627
4628         if (debug) {
4629                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
4630                     SPP_ARGS(ifp), cp->name,
4631                     sppp_auth_type_name(cp->proto, lh->type),
4632                     lh->ident, ntohs(lh->len));
4633                 sppp_print_bytes((u_char*) (lh+1), len);
4634                 addlog(">\n");
4635         }
4636         if (IF_QFULL (&sp->pp_cpq)) {
4637                 IF_DROP (&sp->pp_fastq);
4638                 IF_DROP (&ifp->if_snd);
4639                 m_freem (m);
4640                 ++ifp->if_oerrors;
4641         } else
4642                 IF_ENQUEUE (&sp->pp_cpq, m);
4643         if (! (ifp->if_flags & IFF_OACTIVE))
4644                 (*ifp->if_start) (ifp);
4645         ifp->if_obytes += m->m_pkthdr.len + 3;
4646 }
4647
4648 /*
4649  * Flush interface queue.
4650  */
4651 static void
4652 sppp_qflush(struct ifqueue *ifq)
4653 {
4654         struct mbuf *m, *n;
4655
4656         n = ifq->ifq_head;
4657         while ((m = n)) {
4658                 n = m->m_nextpkt;
4659                 m_freem (m);
4660         }
4661         ifq->ifq_head = 0;
4662         ifq->ifq_tail = 0;
4663         ifq->ifq_len = 0;
4664 }
4665
4666 /*
4667  * Send keepalive packets, every 10 seconds.
4668  */
4669 static void
4670 sppp_keepalive(void *dummy)
4671 {
4672         struct sppp *sp;
4673         int s;
4674
4675         s = splimp();
4676         for (sp=spppq; sp; sp=sp->pp_next) {
4677                 struct ifnet *ifp = &sp->pp_if;
4678
4679                 /* Keepalive mode disabled or channel down? */
4680                 if (! (sp->pp_flags & PP_KEEPALIVE) ||
4681                     ! (ifp->if_flags & IFF_RUNNING))
4682                         continue;
4683
4684                 /* No keepalive in PPP mode if LCP not opened yet. */
4685                 if (sp->pp_mode != IFF_CISCO &&
4686                     sp->pp_phase < PHASE_AUTHENTICATE)
4687                         continue;
4688
4689                 if (sp->pp_alivecnt == MAXALIVECNT) {
4690                         /* No keepalive packets got.  Stop the interface. */
4691                         printf (SPP_FMT "down\n", SPP_ARGS(ifp));
4692                         if_down (ifp);
4693                         sppp_qflush (&sp->pp_cpq);
4694                         if (sp->pp_mode != IFF_CISCO) {
4695                                 /* XXX */
4696                                 /* Shut down the PPP link. */
4697                                 lcp.Down(sp);
4698                                 /* Initiate negotiation. XXX */
4699                                 lcp.Up(sp);
4700                         }
4701                 }
4702                 if (sp->pp_alivecnt <= MAXALIVECNT)
4703                         ++sp->pp_alivecnt;
4704                 if (sp->pp_mode == IFF_CISCO)
4705                         sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ,
4706                                  ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]);
4707                 else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
4708                         long nmagic = htonl (sp->lcp.magic);
4709                         sp->lcp.echoid = ++sp->pp_seq[IDX_LCP];
4710                         sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
4711                                 sp->lcp.echoid, 4, &nmagic);
4712                 }
4713         }
4714         splx(s);
4715         callout_reset(&keepalive_timeout, hz * 10, sppp_keepalive, NULL);
4716 }
4717
4718 /*
4719  * Get both IP addresses.
4720  */
4721 static void
4722 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
4723 {
4724         struct ifnet *ifp = &sp->pp_if;
4725         struct ifaddr *ifa;
4726         struct sockaddr_in *si, *sm;
4727         u_long ssrc, ddst;
4728
4729         sm = NULL;
4730         ssrc = ddst = 0L;
4731         /*
4732          * Pick the first AF_INET address from the list,
4733          * aliases don't make any sense on a p2p link anyway.
4734          */
4735         si = 0;
4736 #if defined(__DragonFly__)
4737         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4738 #elif defined(__NetBSD__) || defined (__OpenBSD__)
4739         for (ifa = ifp->if_addrlist.tqh_first;
4740              ifa;
4741              ifa = ifa->ifa_list.tqe_next)
4742 #else
4743         for (ifa = ifp->if_addrlist;
4744              ifa;
4745              ifa = ifa->ifa_next)
4746 #endif
4747                 if (ifa->ifa_addr->sa_family == AF_INET) {
4748                         si = (struct sockaddr_in *)ifa->ifa_addr;
4749                         sm = (struct sockaddr_in *)ifa->ifa_netmask;
4750                         if (si)
4751                                 break;
4752                 }
4753         if (ifa) {
4754                 if (si && si->sin_addr.s_addr) {
4755                         ssrc = si->sin_addr.s_addr;
4756                         if (srcmask)
4757                                 *srcmask = ntohl(sm->sin_addr.s_addr);
4758                 }
4759
4760                 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
4761                 if (si && si->sin_addr.s_addr)
4762                         ddst = si->sin_addr.s_addr;
4763         }
4764
4765         if (dst) *dst = ntohl(ddst);
4766         if (src) *src = ntohl(ssrc);
4767 }
4768
4769 /*
4770  * Set my IP address.  Must be called at splimp.
4771  */
4772 static void
4773 sppp_set_ip_addr(struct sppp *sp, u_long src)
4774 {
4775         STDDCL;
4776         struct ifaddr *ifa;
4777         struct sockaddr_in *si;
4778         struct in_ifaddr *ia;
4779
4780         /*
4781          * Pick the first AF_INET address from the list,
4782          * aliases don't make any sense on a p2p link anyway.
4783          */
4784         si = 0;
4785 #if defined(__DragonFly__)
4786         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4787 #elif defined(__NetBSD__) || defined (__OpenBSD__)
4788         for (ifa = ifp->if_addrlist.tqh_first;
4789              ifa;
4790              ifa = ifa->ifa_list.tqe_next)
4791 #else
4792         for (ifa = ifp->if_addrlist;
4793              ifa;
4794              ifa = ifa->ifa_next)
4795 #endif
4796         {
4797                 if (ifa->ifa_addr->sa_family == AF_INET)
4798                 {
4799                         si = (struct sockaddr_in *)ifa->ifa_addr;
4800                         if (si)
4801                                 break;
4802                 }
4803         }
4804
4805         if (ifa && si)
4806         {
4807                 int error;
4808 #if __NetBSD_Version__ >= 103080000
4809                 struct sockaddr_in new_sin = *si;
4810
4811                 new_sin.sin_addr.s_addr = htonl(src);
4812                 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 1);
4813                 if(debug && error)
4814                 {
4815                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: in_ifinit "
4816                         " failed, error=%d\n", SPP_ARGS(ifp), error);
4817                 }
4818 #else
4819                 /* delete old route */
4820                 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST);
4821                 if(debug && error)
4822                 {
4823                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
4824                                 SPP_ARGS(ifp), error);
4825                 }
4826
4827                 /* set new address */
4828                 si->sin_addr.s_addr = htonl(src);
4829                 ia = ifatoia(ifa);
4830                 LIST_REMOVE(ia, ia_hash);
4831                 LIST_INSERT_HEAD(INADDR_HASH(si->sin_addr.s_addr), ia, ia_hash);
4832
4833                 /* add new route */
4834                 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST);
4835                 if (debug && error)
4836                 {
4837                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
4838                                 SPP_ARGS(ifp), error);
4839                 }
4840 #endif
4841         }
4842 }
4843
4844 #ifdef INET6
4845 /*
4846  * Get both IPv6 addresses.
4847  */
4848 static void
4849 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst,
4850                    struct in6_addr *srcmask)
4851 {
4852         struct ifnet *ifp = &sp->pp_if;
4853         struct ifaddr *ifa;
4854         struct sockaddr_in6 *si, *sm;
4855         struct in6_addr ssrc, ddst;
4856
4857         sm = NULL;
4858         bzero(&ssrc, sizeof(ssrc));
4859         bzero(&ddst, sizeof(ddst));
4860         /*
4861          * Pick the first link-local AF_INET6 address from the list,
4862          * aliases don't make any sense on a p2p link anyway.
4863          */
4864 #if defined(__DragonFly__)
4865         si = 0;
4866         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4867 #elif defined(__NetBSD__) || defined (__OpenBSD__)
4868         for (ifa = ifp->if_addrlist.tqh_first, si = 0;
4869              ifa;
4870              ifa = ifa->ifa_list.tqe_next)
4871 #else
4872         for (ifa = ifp->if_addrlist, si = 0;
4873              ifa;
4874              ifa = ifa->ifa_next)
4875 #endif
4876                 if (ifa->ifa_addr->sa_family == AF_INET6) {
4877                         si = (struct sockaddr_in6 *)ifa->ifa_addr;
4878                         sm = (struct sockaddr_in6 *)ifa->ifa_netmask;
4879                         if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr))
4880                                 break;
4881                 }
4882         if (ifa) {
4883                 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) {
4884                         bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc));
4885                         if (srcmask) {
4886                                 bcopy(&sm->sin6_addr, srcmask,
4887                                       sizeof(*srcmask));
4888                         }
4889                 }
4890
4891                 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
4892                 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr))
4893                         bcopy(&si->sin6_addr, &ddst, sizeof(ddst));
4894         }
4895
4896         if (dst)
4897                 bcopy(&ddst, dst, sizeof(*dst));
4898         if (src)
4899                 bcopy(&ssrc, src, sizeof(*src));
4900 }
4901
4902 #ifdef IPV6CP_MYIFID_DYN
4903 /*
4904  * Generate random ifid.
4905  */
4906 static void
4907 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr)
4908 {
4909         /* TBD */
4910 }
4911
4912 /*
4913  * Set my IPv6 address.  Must be called at splimp.
4914  */
4915 static void
4916 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src)
4917 {
4918         STDDCL;
4919         struct ifaddr *ifa;
4920         struct sockaddr_in6 *sin6;
4921
4922         /*
4923          * Pick the first link-local AF_INET6 address from the list,
4924          * aliases don't make any sense on a p2p link anyway.
4925          */
4926
4927         sin6 = NULL;
4928 #if defined(__DragonFly__)
4929         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4930 #elif defined(__NetBSD__) || defined (__OpenBSD__)
4931         for (ifa = ifp->if_addrlist.tqh_first;
4932              ifa;
4933              ifa = ifa->ifa_list.tqe_next)
4934 #else
4935         for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
4936 #endif
4937         {
4938                 if (ifa->ifa_addr->sa_family == AF_INET6)
4939                 {
4940                         sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
4941                         if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
4942                                 break;
4943                 }
4944         }
4945
4946         if (ifa && sin6)
4947         {
4948                 int error;
4949                 struct sockaddr_in6 new_sin6 = *sin6;
4950
4951                 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr));
4952                 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1);
4953                 if (debug && error)
4954                 {
4955                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit "
4956                             " failed, error=%d\n", SPP_ARGS(ifp), error);
4957                 }
4958         }
4959 }
4960 #endif
4961
4962 /*
4963  * Suggest a candidate address to be used by peer.
4964  */
4965 static void
4966 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest)
4967 {
4968         struct in6_addr myaddr;
4969         struct timeval tv;
4970
4971         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
4972
4973         myaddr.s6_addr[8] &= ~0x02;     /* u bit to "local" */
4974         microtime(&tv);
4975         if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) {
4976                 myaddr.s6_addr[14] ^= 0xff;
4977                 myaddr.s6_addr[15] ^= 0xff;
4978         } else {
4979                 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff);
4980                 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff);
4981         }
4982         if (suggest)
4983                 bcopy(&myaddr, suggest, sizeof(myaddr));
4984 }
4985 #endif /*INET6*/
4986
4987 static int
4988 sppp_params(struct sppp *sp, u_long cmd, void *data)
4989 {
4990         u_long subcmd;
4991         struct ifreq *ifr = (struct ifreq *)data;
4992         struct spppreq *spr;
4993         int rv = 0;
4994
4995         spr = malloc(sizeof(struct spppreq), M_TEMP, M_INTWAIT);
4996
4997         /*
4998          * ifr->ifr_data is supposed to point to a struct spppreq.
4999          * Check the cmd word first before attempting to fetch all the
5000          * data.
5001          */
5002         if ((subcmd = fuword(ifr->ifr_data)) == -1) {
5003                 rv = EFAULT;
5004                 goto quit;
5005         }
5006
5007         if (copyin((caddr_t)ifr->ifr_data, spr, sizeof(struct spppreq)) != 0) {
5008                 rv = EFAULT;
5009                 goto quit;
5010         }
5011
5012         switch (subcmd) {
5013         case (int)SPPPIOGDEFS:
5014                 if (cmd != SIOCGIFGENERIC) {
5015                         rv = EINVAL;
5016                         break;
5017                 }
5018                 /*
5019                  * We copy over the entire current state, but clean
5020                  * out some of the stuff we don't wanna pass up.
5021                  * Remember, SIOCGIFGENERIC is unprotected, and can be
5022                  * called by any user.  No need to ever get PAP or
5023                  * CHAP secrets back to userland anyway.
5024                  */
5025                 spr->defs.pp_phase = sp->pp_phase;
5026                 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0;
5027                 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0;
5028                 spr->defs.lcp = sp->lcp;
5029                 spr->defs.ipcp = sp->ipcp;
5030                 spr->defs.ipv6cp = sp->ipv6cp;
5031                 spr->defs.myauth = sp->myauth;
5032                 spr->defs.hisauth = sp->hisauth;
5033                 bzero(spr->defs.myauth.secret, AUTHKEYLEN);
5034                 bzero(spr->defs.myauth.challenge, AUTHKEYLEN);
5035                 bzero(spr->defs.hisauth.secret, AUTHKEYLEN);
5036                 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN);
5037                 /*
5038                  * Fixup the LCP timeout value to milliseconds so
5039                  * spppcontrol doesn't need to bother about the value
5040                  * of "hz".  We do the reverse calculation below when
5041                  * setting it.
5042                  */
5043                 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz;
5044                 rv = copyout(spr, (caddr_t)ifr->ifr_data,
5045                              sizeof(struct spppreq));
5046                 break;
5047
5048         case (int)SPPPIOSDEFS:
5049                 if (cmd != SIOCSIFGENERIC) {
5050                         rv = EINVAL;
5051                         break;
5052                 }
5053                 /*
5054                  * We have a very specific idea of which fields we
5055                  * allow being passed back from userland, so to not
5056                  * clobber our current state.  For one, we only allow
5057                  * setting anything if LCP is in dead or establish
5058                  * phase.  Once the authentication negotiations
5059                  * started, the authentication settings must not be
5060                  * changed again.  (The administrator can force an
5061                  * ifconfig down in order to get LCP back into dead
5062                  * phase.)
5063                  *
5064                  * Also, we only allow for authentication parameters to be
5065                  * specified.
5066                  *
5067                  * XXX Should allow to set or clear pp_flags.
5068                  *
5069                  * Finally, if the respective authentication protocol to
5070                  * be used is set differently than 0, but the secret is
5071                  * passed as all zeros, we don't trash the existing secret.
5072                  * This allows an administrator to change the system name
5073                  * only without clobbering the secret (which he didn't get
5074                  * back in a previous SPPPIOGDEFS call).  However, the
5075                  * secrets are cleared if the authentication protocol is
5076                  * reset to 0.  */
5077                 if (sp->pp_phase != PHASE_DEAD &&
5078                     sp->pp_phase != PHASE_ESTABLISH) {
5079                         rv = EBUSY;
5080                         break;
5081                 }
5082
5083                 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP &&
5084                      spr->defs.myauth.proto != PPP_CHAP) ||
5085                     (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP &&
5086                      spr->defs.hisauth.proto != PPP_CHAP)) {
5087                         rv = EINVAL;
5088                         break;
5089                 }
5090
5091                 if (spr->defs.myauth.proto == 0)
5092                         /* resetting myauth */
5093                         bzero(&sp->myauth, sizeof sp->myauth);
5094                 else {
5095                         /* setting/changing myauth */
5096                         sp->myauth.proto = spr->defs.myauth.proto;
5097                         bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
5098                         if (spr->defs.myauth.secret[0] != '\0')
5099                                 bcopy(spr->defs.myauth.secret, sp->myauth.secret,
5100                                       AUTHKEYLEN);
5101                 }
5102                 if (spr->defs.hisauth.proto == 0)
5103                         /* resetting hisauth */
5104                         bzero(&sp->hisauth, sizeof sp->hisauth);
5105                 else {
5106                         /* setting/changing hisauth */
5107                         sp->hisauth.proto = spr->defs.hisauth.proto;
5108                         sp->hisauth.flags = spr->defs.hisauth.flags;
5109                         bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
5110                         if (spr->defs.hisauth.secret[0] != '\0')
5111                                 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret,
5112                                       AUTHKEYLEN);
5113                 }
5114                 /* set LCP restart timer timeout */
5115                 if (spr->defs.lcp.timeout != 0)
5116                         sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000;
5117                 /* set VJ enable and IPv6 disable flags */
5118 #ifdef INET
5119                 if (spr->defs.enable_vj)
5120                         sp->confflags |= CONF_ENABLE_VJ;
5121                 else
5122                         sp->confflags &= ~CONF_ENABLE_VJ;
5123 #endif
5124 #ifdef INET6
5125                 if (spr->defs.enable_ipv6)
5126                         sp->confflags |= CONF_ENABLE_IPV6;
5127                 else
5128                         sp->confflags &= ~CONF_ENABLE_IPV6;
5129 #endif
5130                 break;
5131
5132         default:
5133                 rv = EINVAL;
5134         }
5135
5136  quit:
5137         free(spr, M_TEMP);
5138
5139         return (rv);
5140 }
5141
5142 static void
5143 sppp_phase_network(struct sppp *sp)
5144 {
5145         STDDCL;
5146         int i;
5147         u_long mask;
5148
5149         sp->pp_phase = PHASE_NETWORK;
5150
5151         if (debug)
5152                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
5153                     sppp_phase_name(sp->pp_phase));
5154
5155         /* Notify NCPs now. */
5156         for (i = 0; i < IDX_COUNT; i++)
5157                 if ((cps[i])->flags & CP_NCP)
5158                         (cps[i])->Open(sp);
5159
5160         /* Send Up events to all NCPs. */
5161         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
5162                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP))
5163                         (cps[i])->Up(sp);
5164
5165         /* if no NCP is starting, all this was in vain, close down */
5166         sppp_lcp_check_and_close(sp);
5167 }
5168
5169
5170 static const char *
5171 sppp_cp_type_name(u_char type)
5172 {
5173         static char buf[12];
5174         switch (type) {
5175         case CONF_REQ:   return "conf-req";
5176         case CONF_ACK:   return "conf-ack";
5177         case CONF_NAK:   return "conf-nak";
5178         case CONF_REJ:   return "conf-rej";
5179         case TERM_REQ:   return "term-req";
5180         case TERM_ACK:   return "term-ack";
5181         case CODE_REJ:   return "code-rej";
5182         case PROTO_REJ:  return "proto-rej";
5183         case ECHO_REQ:   return "echo-req";
5184         case ECHO_REPLY: return "echo-reply";
5185         case DISC_REQ:   return "discard-req";
5186         }
5187         snprintf (buf, sizeof(buf), "cp/0x%x", type);
5188         return buf;
5189 }
5190
5191 static const char *
5192 sppp_auth_type_name(u_short proto, u_char type)
5193 {
5194         static char buf[12];
5195         switch (proto) {
5196         case PPP_CHAP:
5197                 switch (type) {
5198                 case CHAP_CHALLENGE:    return "challenge";
5199                 case CHAP_RESPONSE:     return "response";
5200                 case CHAP_SUCCESS:      return "success";
5201                 case CHAP_FAILURE:      return "failure";
5202                 }
5203         case PPP_PAP:
5204                 switch (type) {
5205                 case PAP_REQ:           return "req";
5206                 case PAP_ACK:           return "ack";
5207                 case PAP_NAK:           return "nak";
5208                 }
5209         }
5210         snprintf (buf, sizeof(buf), "auth/0x%x", type);
5211         return buf;
5212 }
5213
5214 static const char *
5215 sppp_lcp_opt_name(u_char opt)
5216 {
5217         static char buf[12];
5218         switch (opt) {
5219         case LCP_OPT_MRU:               return "mru";
5220         case LCP_OPT_ASYNC_MAP:         return "async-map";
5221         case LCP_OPT_AUTH_PROTO:        return "auth-proto";
5222         case LCP_OPT_QUAL_PROTO:        return "qual-proto";
5223         case LCP_OPT_MAGIC:             return "magic";
5224         case LCP_OPT_PROTO_COMP:        return "proto-comp";
5225         case LCP_OPT_ADDR_COMP:         return "addr-comp";
5226         }
5227         snprintf (buf, sizeof(buf), "lcp/0x%x", opt);
5228         return buf;
5229 }
5230
5231 static const char *
5232 sppp_ipcp_opt_name(u_char opt)
5233 {
5234         static char buf[12];
5235         switch (opt) {
5236         case IPCP_OPT_ADDRESSES:        return "addresses";
5237         case IPCP_OPT_COMPRESSION:      return "compression";
5238         case IPCP_OPT_ADDRESS:          return "address";
5239         }
5240         snprintf (buf, sizeof(buf), "ipcp/0x%x", opt);
5241         return buf;
5242 }
5243
5244 #ifdef INET6
5245 static const char *
5246 sppp_ipv6cp_opt_name(u_char opt)
5247 {
5248         static char buf[12];
5249         switch (opt) {
5250         case IPV6CP_OPT_IFID:           return "ifid";
5251         case IPV6CP_OPT_COMPRESSION:    return "compression";
5252         }
5253         sprintf (buf, "0x%x", opt);
5254         return buf;
5255 }
5256 #endif
5257
5258 static const char *
5259 sppp_state_name(int state)
5260 {
5261         switch (state) {
5262         case STATE_INITIAL:     return "initial";
5263         case STATE_STARTING:    return "starting";
5264         case STATE_CLOSED:      return "closed";
5265         case STATE_STOPPED:     return "stopped";
5266         case STATE_CLOSING:     return "closing";
5267         case STATE_STOPPING:    return "stopping";
5268         case STATE_REQ_SENT:    return "req-sent";
5269         case STATE_ACK_RCVD:    return "ack-rcvd";
5270         case STATE_ACK_SENT:    return "ack-sent";
5271         case STATE_OPENED:      return "opened";
5272         }
5273         return "illegal";
5274 }
5275
5276 static const char *
5277 sppp_phase_name(enum ppp_phase phase)
5278 {
5279         switch (phase) {
5280         case PHASE_DEAD:        return "dead";
5281         case PHASE_ESTABLISH:   return "establish";
5282         case PHASE_TERMINATE:   return "terminate";
5283         case PHASE_AUTHENTICATE: return "authenticate";
5284         case PHASE_NETWORK:     return "network";
5285         }
5286         return "illegal";
5287 }
5288
5289 static const char *
5290 sppp_proto_name(u_short proto)
5291 {
5292         static char buf[12];
5293         switch (proto) {
5294         case PPP_LCP:   return "lcp";
5295         case PPP_IPCP:  return "ipcp";
5296         case PPP_PAP:   return "pap";
5297         case PPP_CHAP:  return "chap";
5298         case PPP_IPV6CP: return "ipv6cp";
5299         }
5300         snprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto);
5301         return buf;
5302 }
5303
5304 static void
5305 sppp_print_bytes(const u_char *p, u_short len)
5306 {
5307         if (len)
5308                 addlog(" %*D", len, p, "-");
5309 }
5310
5311 static void
5312 sppp_print_string(const char *p, u_short len)
5313 {
5314         u_char c;
5315
5316         while (len-- > 0) {
5317                 c = *p++;
5318                 /*
5319                  * Print only ASCII chars directly.  RFC 1994 recommends
5320                  * using only them, but we don't rely on it.  */
5321                 if (c < ' ' || c > '~')
5322                         addlog("\\x%x", c);
5323                 else
5324                         addlog("%c", c);
5325         }
5326 }
5327
5328 static const char *
5329 sppp_dotted_quad(u_long addr)
5330 {
5331         static char s[16];
5332         sprintf(s, "%d.%d.%d.%d",
5333                 (int)((addr >> 24) & 0xff),
5334                 (int)((addr >> 16) & 0xff),
5335                 (int)((addr >> 8) & 0xff),
5336                 (int)(addr & 0xff));
5337         return s;
5338 }
5339
5340 static int
5341 sppp_strnlen(u_char *p, int max)
5342 {
5343         int len;
5344
5345         for (len = 0; len < max && *p; ++p)
5346                 ++len;
5347         return len;
5348 }
5349
5350 /* a dummy, used to drop uninteresting events */
5351 static void
5352 sppp_null(struct sppp *unused)
5353 {
5354         /* do just nothing */
5355 }