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 1.35 2008/06/09 11:24:24 sephe Exp $
  22  */
  23
  24 #include <sys/param.h>
  25
  26 #if defined(__DragonFly__)
  27 #include "opt_inet.h"
  28 #include "opt_inet6.h"
  29 #include "opt_ipx.h"
  30 #endif
  31
  32 #ifdef NetBSD1_3
  33 #  if NetBSD1_3 > 6
  34 #      include "opt_inet.h"
  35 #      include "opt_inet6.h"
  36 #      include "opt_iso.h"
  37 #  endif
  38 #endif
  39
  40 #include <sys/systm.h>
  41 #include <sys/kernel.h>
  42 #include <sys/module.h>
  43 #include <sys/sockio.h>
  44 #include <sys/socket.h>
  45 #include <sys/syslog.h>
  46 #if defined(__DragonFly__)
  47 #include <sys/random.h>
  48 #include <sys/thread2.h>
  49 #endif
  50 #include <sys/malloc.h>
  51 #include <sys/mbuf.h>
  52
  53 #if defined (__OpenBSD__)
  54 #include <sys/md5k.h>
  55 #else
  56 #include <sys/md5.h>
  57 #endif
  58
  59 #include <net/if.h>
  60 #include <net/ifq_var.h>
  61 #include <net/netisr.h>
  62 #include <net/if_types.h>
  63 #include <net/route.h>
  64 #include <netinet/in.h>
  65 #include <netinet/in_systm.h>
  66 #include <netinet/ip.h>
  67 #include <net/slcompress.h>
  68
  69 #if defined (__NetBSD__) || defined (__OpenBSD__)
  70 #include <machine/cpu.h> /* XXX for softnet */
  71 #endif
  72
  73 #include <machine/stdarg.h>
  74
  75 #include <netinet/in.h>
  76 #include <netinet/in_systm.h>
  77 #include <netinet/in_var.h>
  78
  79 #ifdef INET
  80 #include <netinet/ip.h>
  81 #include <netinet/tcp.h>
  82 #endif
  83
  84 #if defined (__DragonFly__) || defined (__OpenBSD__)
  85 # include <netinet/if_ether.h>
  86 #else
  87 # include <net/ethertypes.h>
  88 #endif
  89
  90 #ifdef IPX
  91 #include <netproto/ipx/ipx.h>
  92 #include <netproto/ipx/ipx_if.h>
  93 #endif
  94
  95 #include "if_sppp.h"
  96
  97 #define IOCTL_CMD_T     u_long
  98 #define MAXALIVECNT     3               /* max. alive packets */
  99
 100 /*
 101  * Interface flags that can be set in an ifconfig command.
 102  *
 103  * Setting link0 will make the link passive, i.e. it will be marked
 104  * as being administrative openable, but won't be opened to begin
 105  * with.  Incoming calls will be answered, or subsequent calls with
 106  * -link1 will cause the administrative open of the LCP layer.
 107  *
 108  * Setting link1 will cause the link to auto-dial only as packets
 109  * arrive to be sent.
 110  *
 111  * Setting IFF_DEBUG will syslog the option negotiation and state
 112  * transitions at level kern.debug.  Note: all logs consistently look
 113  * like
 114  *
 115  *   <if-name><unit>: <proto-name> <additional info...>
 116  *
 117  * with <if-name><unit> being something like "bppp0", and <proto-name>
 118  * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
 119  */
 120
 121 #define IFF_PASSIVE     IFF_LINK0       /* wait passively for connection */
 122 #define IFF_AUTO        IFF_LINK1       /* auto-dial on output */
 123 #define IFF_CISCO       IFF_LINK2       /* auto-dial on output */
 124
 125 #define PPP_ALLSTATIONS 0xff            /* All-Stations broadcast address */
 126 #define PPP_UI          0x03            /* Unnumbered Information */
 127 #define PPP_IP          0x0021          /* Internet Protocol */
 128 #define PPP_ISO         0x0023          /* ISO OSI Protocol */
 129 #define PPP_XNS         0x0025          /* Xerox NS Protocol */
 130 #define PPP_IPX         0x002b          /* Novell IPX Protocol */
 131 #define PPP_VJ_COMP     0x002d          /* VJ compressed TCP/IP */
 132 #define PPP_VJ_UCOMP    0x002f          /* VJ uncompressed TCP/IP */
 133 #define PPP_IPV6        0x0057          /* Internet Protocol Version 6 */
 134 #define PPP_LCP         0xc021          /* Link Control Protocol */
 135 #define PPP_PAP         0xc023          /* Password Authentication Protocol */
 136 #define PPP_CHAP        0xc223          /* Challenge-Handshake Auth Protocol */
 137 #define PPP_IPCP        0x8021          /* Internet Protocol Control Protocol */
 138 #define PPP_IPV6CP      0x8057          /* IPv6 Control Protocol */
 139
 140 #define CONF_REQ        1               /* PPP configure request */
 141 #define CONF_ACK        2               /* PPP configure acknowledge */
 142 #define CONF_NAK        3               /* PPP configure negative ack */
 143 #define CONF_REJ        4               /* PPP configure reject */
 144 #define TERM_REQ        5               /* PPP terminate request */
 145 #define TERM_ACK        6               /* PPP terminate acknowledge */
 146 #define CODE_REJ        7               /* PPP code reject */
 147 #define PROTO_REJ       8               /* PPP protocol reject */
 148 #define ECHO_REQ        9               /* PPP echo request */
 149 #define ECHO_REPLY      10              /* PPP echo reply */
 150 #define DISC_REQ        11              /* PPP discard request */
 151
 152 #define LCP_OPT_MRU             1       /* maximum receive unit */
 153 #define LCP_OPT_ASYNC_MAP       2       /* async control character map */
 154 #define LCP_OPT_AUTH_PROTO      3       /* authentication protocol */
 155 #define LCP_OPT_QUAL_PROTO      4       /* quality protocol */
 156 #define LCP_OPT_MAGIC           5       /* magic number */
 157 #define LCP_OPT_RESERVED        6       /* reserved */
 158 #define LCP_OPT_PROTO_COMP      7       /* protocol field compression */
 159 #define LCP_OPT_ADDR_COMP       8       /* address/control field compression */
 160
 161 #define IPCP_OPT_ADDRESSES      1       /* both IP addresses; deprecated */
 162 #define IPCP_OPT_COMPRESSION    2       /* IP compression protocol (VJ) */
 163 #define IPCP_OPT_ADDRESS        3       /* local IP address */
 164
 165 #define IPV6CP_OPT_IFID 1       /* interface identifier */
 166 #define IPV6CP_OPT_COMPRESSION  2       /* IPv6 compression protocol */
 167
 168 #define IPCP_COMP_VJ            0x2d    /* Code for VJ compression */
 169
 170 #define PAP_REQ                 1       /* PAP name/password request */
 171 #define PAP_ACK                 2       /* PAP acknowledge */
 172 #define PAP_NAK                 3       /* PAP fail */
 173
 174 #define CHAP_CHALLENGE          1       /* CHAP challenge request */
 175 #define CHAP_RESPONSE           2       /* CHAP challenge response */
 176 #define CHAP_SUCCESS            3       /* CHAP response ok */
 177 #define CHAP_FAILURE            4       /* CHAP response failed */
 178
 179 #define CHAP_MD5                5       /* hash algorithm - MD5 */
 180
 181 #define CISCO_MULTICAST         0x8f    /* Cisco multicast address */
 182 #define CISCO_UNICAST           0x0f    /* Cisco unicast address */
 183 #define CISCO_KEEPALIVE         0x8035  /* Cisco keepalive protocol */
 184 #define CISCO_ADDR_REQ          0       /* Cisco address request */
 185 #define CISCO_ADDR_REPLY        1       /* Cisco address reply */
 186 #define CISCO_KEEPALIVE_REQ     2       /* Cisco keepalive request */
 187
 188 /* states are named and numbered according to RFC 1661 */
 189 #define STATE_INITIAL   0
 190 #define STATE_STARTING  1
 191 #define STATE_CLOSED    2
 192 #define STATE_STOPPED   3
 193 #define STATE_CLOSING   4
 194 #define STATE_STOPPING  5
 195 #define STATE_REQ_SENT  6
 196 #define STATE_ACK_RCVD  7
 197 #define STATE_ACK_SENT  8
 198 #define STATE_OPENED    9
 199
 200 struct ppp_header {
 201         u_char address;
 202         u_char control;
 203         u_short protocol;
 204 } __attribute__((__packed__));
 205 #define PPP_HEADER_LEN          sizeof (struct ppp_header)
 206
 207 struct lcp_header {
 208         u_char type;
 209         u_char ident;
 210         u_short len;
 211 } __attribute__((__packed__));
 212 #define LCP_HEADER_LEN          sizeof (struct lcp_header)
 213
 214 struct cisco_packet {
 215         u_long type;
 216         u_long par1;
 217         u_long par2;
 218         u_short rel;
 219         u_short time0;
 220         u_short time1;
 221 } __attribute__((__packed__));
 222 #define CISCO_PACKET_LEN        sizeof (struct cisco_packet)
 223
 224 /*
 225  * We follow the spelling and capitalization of RFC 1661 here, to make
 226  * it easier comparing with the standard.  Please refer to this RFC in
 227  * case you can't make sense out of these abbreviation; it will also
 228  * explain the semantics related to the various events and actions.
 229  */
 230 struct cp {
 231         u_short proto;          /* PPP control protocol number */
 232         u_char protoidx;        /* index into state table in struct sppp */
 233         u_char flags;
 234 #define CP_LCP          0x01    /* this is the LCP */
 235 #define CP_AUTH         0x02    /* this is an authentication protocol */
 236 #define CP_NCP          0x04    /* this is a NCP */
 237 #define CP_QUAL         0x08    /* this is a quality reporting protocol */
 238         const char *name;       /* name of this control protocol */
 239         /* event handlers */
 240         void    (*Up)(struct sppp *sp);
 241         void    (*Down)(struct sppp *sp);
 242         void    (*Open)(struct sppp *sp);
 243         void    (*Close)(struct sppp *sp);
 244         void    (*TO)(void *sp);
 245         int     (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
 246         void    (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
 247         void    (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
 248         /* actions */
 249         void    (*tlu)(struct sppp *sp);
 250         void    (*tld)(struct sppp *sp);
 251         void    (*tls)(struct sppp *sp);
 252         void    (*tlf)(struct sppp *sp);
 253         void    (*scr)(struct sppp *sp);
 254 };
 255
 256 static struct sppp *spppq;
 257 #if defined(__DragonFly__)
 258 static struct callout keepalive_timeout;
 259 #endif
 260
 261 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 && !defined(__DragonFly__)
 262 #define SPP_FMT         "%s%d: "
 263 #define SPP_ARGS(ifp)   (ifp)->if_name, (ifp)->if_unit
 264 #else
 265 #define SPP_FMT         "%s: "
 266 #define SPP_ARGS(ifp)   (ifp)->if_xname
 267 #endif
 268
 269 #ifdef INET
 270 /*
 271  * The following disgusting hack gets around the problem that IP TOS
 272  * can't be set yet.  We want to put "interactive" traffic on a high
 273  * priority queue.  To decide if traffic is interactive, we check that
 274  * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
 275  *
 276  * XXX is this really still necessary?  - joerg -
 277  */
 278 static u_short interactive_ports[8] = {
 279         0,      513,    0,      0,
 280         0,      21,     0,      23,
 281 };
 282 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
 283 #endif
 284
 285 /* almost every function needs these */
 286 #define STDDCL                                                  \
 287         struct ifnet *ifp = &sp->pp_if;                         \
 288         int debug = ifp->if_flags & IFF_DEBUG
 289
 290 static int sppp_output(struct ifnet *ifp, struct mbuf *m,
 291                        struct sockaddr *dst, struct rtentry *rt);
 292
 293 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
 294 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
 295
 296 static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
 297                           struct mbuf *m);
 298 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
 299                          u_char ident, u_short len, void *data);
 300 /* static void sppp_cp_timeout(void *arg); */
 301 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
 302                                  int newstate);
 303 static void sppp_auth_send(const struct cp *cp,
 304                            struct sppp *sp, unsigned int type, unsigned int id,
 305                            ...);
 306
 307 static void sppp_up_event(const struct cp *cp, struct sppp *sp);
 308 static void sppp_down_event(const struct cp *cp, struct sppp *sp);
 309 static void sppp_open_event(const struct cp *cp, struct sppp *sp);
 310 static void sppp_close_event(const struct cp *cp, struct sppp *sp);
 311 static void sppp_to_event(const struct cp *cp, struct sppp *sp);
 312
 313 static void sppp_null(struct sppp *sp);
 314
 315 static void sppp_lcp_init(struct sppp *sp);
 316 static void sppp_lcp_up(struct sppp *sp);
 317 static void sppp_lcp_down(struct sppp *sp);
 318 static void sppp_lcp_open(struct sppp *sp);
 319 static void sppp_lcp_close(struct sppp *sp);
 320 static void sppp_lcp_TO(void *sp);
 321 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 322 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 323 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 324 static void sppp_lcp_tlu(struct sppp *sp);
 325 static void sppp_lcp_tld(struct sppp *sp);
 326 static void sppp_lcp_tls(struct sppp *sp);
 327 static void sppp_lcp_tlf(struct sppp *sp);
 328 static void sppp_lcp_scr(struct sppp *sp);
 329 static void sppp_lcp_check_and_close(struct sppp *sp);
 330 static int sppp_ncp_check(struct sppp *sp);
 331
 332 static void sppp_ipcp_init(struct sppp *sp);
 333 static void sppp_ipcp_up(struct sppp *sp);
 334 static void sppp_ipcp_down(struct sppp *sp);
 335 static void sppp_ipcp_open(struct sppp *sp);
 336 static void sppp_ipcp_close(struct sppp *sp);
 337 static void sppp_ipcp_TO(void *sp);
 338 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 339 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 340 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 341 static void sppp_ipcp_tlu(struct sppp *sp);
 342 static void sppp_ipcp_tld(struct sppp *sp);
 343 static void sppp_ipcp_tls(struct sppp *sp);
 344 static void sppp_ipcp_tlf(struct sppp *sp);
 345 static void sppp_ipcp_scr(struct sppp *sp);
 346
 347 static void sppp_ipv6cp_init(struct sppp *sp);
 348 static void sppp_ipv6cp_up(struct sppp *sp);
 349 static void sppp_ipv6cp_down(struct sppp *sp);
 350 static void sppp_ipv6cp_open(struct sppp *sp);
 351 static void sppp_ipv6cp_close(struct sppp *sp);
 352 static void sppp_ipv6cp_TO(void *sp);
 353 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 354 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 355 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 356 static void sppp_ipv6cp_tlu(struct sppp *sp);
 357 static void sppp_ipv6cp_tld(struct sppp *sp);
 358 static void sppp_ipv6cp_tls(struct sppp *sp);
 359 static void sppp_ipv6cp_tlf(struct sppp *sp);
 360 static void sppp_ipv6cp_scr(struct sppp *sp);
 361
 362 static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
 363 static void sppp_pap_init(struct sppp *sp);
 364 static void sppp_pap_open(struct sppp *sp);
 365 static void sppp_pap_close(struct sppp *sp);
 366 static void sppp_pap_TO(void *sp);
 367 static void sppp_pap_my_TO(void *sp);
 368 static void sppp_pap_tlu(struct sppp *sp);
 369 static void sppp_pap_tld(struct sppp *sp);
 370 static void sppp_pap_scr(struct sppp *sp);
 371
 372 static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
 373 static void sppp_chap_init(struct sppp *sp);
 374 static void sppp_chap_open(struct sppp *sp);
 375 static void sppp_chap_close(struct sppp *sp);
 376 static void sppp_chap_TO(void *sp);
 377 static void sppp_chap_tlu(struct sppp *sp);
 378 static void sppp_chap_tld(struct sppp *sp);
 379 static void sppp_chap_scr(struct sppp *sp);
 380
 381 static const char *sppp_auth_type_name(u_short proto, u_char type);
 382 static const char *sppp_cp_type_name(u_char type);
 383 static const char *sppp_dotted_quad(u_long addr);
 384 static const char *sppp_ipcp_opt_name(u_char opt);
 385 #ifdef INET6
 386 static const char *sppp_ipv6cp_opt_name(u_char opt);
 387 #endif
 388 static const char *sppp_lcp_opt_name(u_char opt);
 389 static const char *sppp_phase_name(enum ppp_phase phase);
 390 static const char *sppp_proto_name(u_short proto);
 391 static const char *sppp_state_name(int state);
 392 static int sppp_params(struct sppp *sp, u_long cmd, void *data);
 393 static int sppp_strnlen(u_char *p, int max);
 394 static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst,
 395                               u_long *srcmask);
 396 static void sppp_keepalive(void *dummy);
 397 static void sppp_phase_network(struct sppp *sp);
 398 static void sppp_print_bytes(const u_char *p, u_short len);
 399 static void sppp_print_string(const char *p, u_short len);
 400 static void sppp_set_ip_addr(struct sppp *sp, u_long src);
 401 #ifdef INET6
 402 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src,
 403                                struct in6_addr *dst, struct in6_addr *srcmask);
 404 #ifdef IPV6CP_MYIFID_DYN
 405 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src);
 406 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src);
 407 #endif
 408 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src);
 409 #endif
 410
 411 /* our control protocol descriptors */
 412 static const struct cp lcp = {
 413         PPP_LCP, IDX_LCP, CP_LCP, "lcp",
 414         sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
 415         sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
 416         sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
 417         sppp_lcp_scr
 418 };
 419
 420 static const struct cp ipcp = {
 421         PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp",
 422         sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
 423         sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
 424         sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
 425         sppp_ipcp_scr
 426 };
 427
 428 static const struct cp ipv6cp = {
 429         PPP_IPV6CP, IDX_IPV6CP,
 430 #ifdef INET6    /*don't run IPv6CP if there's no IPv6 support*/
 431         CP_NCP,
 432 #else
 433         0,
 434 #endif
 435         "ipv6cp",
 436         sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close,
 437         sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak,
 438         sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf,
 439         sppp_ipv6cp_scr
 440 };
 441
 442 static const struct cp pap = {
 443         PPP_PAP, IDX_PAP, CP_AUTH, "pap",
 444         sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
 445         sppp_pap_TO, 0, 0, 0,
 446         sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
 447         sppp_pap_scr
 448 };
 449
 450 static const struct cp chap = {
 451         PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
 452         sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
 453         sppp_chap_TO, 0, 0, 0,
 454         sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
 455         sppp_chap_scr
 456 };
 457
 458 static const struct cp *cps[IDX_COUNT] = {
 459         &lcp,                   /* IDX_LCP */
 460         &ipcp,                  /* IDX_IPCP */
 461         &ipv6cp,                /* IDX_IPV6CP */
 462         &pap,                   /* IDX_PAP */
 463         &chap,                  /* IDX_CHAP */
 464 };
 465
 466 static int
 467 sppp_modevent(module_t mod, int type, void *unused)
 468 {
 469         switch (type) {
 470         case MOD_LOAD:
 471                 callout_init(&keepalive_timeout);
 472                 break;
 473         case MOD_UNLOAD:
 474                 return EACCES;
 475                 break;
 476         default:
 477                 break;
 478         }
 479         return 0;
 480 }
 481 static moduledata_t spppmod = {
 482         "sppp",
 483         sppp_modevent,
 484         0
 485 };
 486 MODULE_VERSION(sppp, 1);
 487 DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY);
 488
 489 /*
 490  * Exported functions, comprising our interface to the lower layer.
 491  */
 492
 493 /*
 494  * Process the received packet.
 495  */
 496 void
 497 sppp_input(struct ifnet *ifp, struct mbuf *m)
 498 {
 499         struct ppp_header *h;
 500         int isr = -1;
 501         struct sppp *sp = (struct sppp *)ifp;
 502         u_char *iphdr;
 503         int hlen, vjlen, do_account = 0;
 504         int debug = ifp->if_flags & IFF_DEBUG;
 505
 506         if (ifp->if_flags & IFF_UP)
 507                 /* Count received bytes, add FCS and one flag */
 508                 ifp->if_ibytes += m->m_pkthdr.len + 3;
 509
 510         if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
 511                 /* Too small packet, drop it. */
 512                 if (debug)
 513                         log(LOG_DEBUG,
 514                             SPP_FMT "input packet is too small, %d bytes\n",
 515                             SPP_ARGS(ifp), m->m_pkthdr.len);
 516           drop:
 517                 m_freem (m);
 518           drop2:
 519                 ++ifp->if_ierrors;
 520                 ++ifp->if_iqdrops;
 521                 return;
 522         }
 523
 524         /* Get PPP header. */
 525         h = mtod (m, struct ppp_header*);
 526         m_adj (m, PPP_HEADER_LEN);
 527
 528         switch (h->address) {
 529         case PPP_ALLSTATIONS:
 530                 if (h->control != PPP_UI)
 531                         goto invalid;
 532                 if (sp->pp_mode == IFF_CISCO) {
 533                         if (debug)
 534                                 log(LOG_DEBUG,
 535                                     SPP_FMT "PPP packet in Cisco mode "
 536                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 537                                     SPP_ARGS(ifp),
 538                                     h->address, h->control, ntohs(h->protocol));
 539                         goto drop;
 540                 }
 541                 switch (ntohs (h->protocol)) {
 542                 default:
 543                         if (debug)
 544                                 log(LOG_DEBUG,
 545                                     SPP_FMT "rejecting protocol "
 546                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 547                                     SPP_ARGS(ifp),
 548                                     h->address, h->control, ntohs(h->protocol));
 549                         if (sp->state[IDX_LCP] == STATE_OPENED)
 550                                 sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
 551                                         ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2,
 552                                         &h->protocol);
 553                         ++ifp->if_noproto;
 554                         goto drop;
 555                 case PPP_LCP:
 556                         sppp_cp_input(&lcp, sp, m);
 557                         m_freem (m);
 558                         return;
 559                 case PPP_PAP:
 560                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
 561                                 sppp_pap_input(sp, m);
 562                         m_freem (m);
 563                         return;
 564                 case PPP_CHAP:
 565                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
 566                                 sppp_chap_input(sp, m);
 567                         m_freem (m);
 568                         return;
 569 #ifdef INET
 570                 case PPP_IPCP:
 571                         if (sp->pp_phase == PHASE_NETWORK)
 572                                 sppp_cp_input(&ipcp, sp, m);
 573                         m_freem (m);
 574                         return;
 575                 case PPP_IP:
 576                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 577                                 isr = NETISR_IP;
 578                         }
 579                         do_account++;
 580                         break;
 581                 case PPP_VJ_COMP:
 582                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 583                                 if ((vjlen =
 584                                      sl_uncompress_tcp_core(mtod(m, u_char *),
 585                                                             m->m_len, m->m_len,
 586                                                             TYPE_COMPRESSED_TCP,
 587                                                             sp->pp_comp,
 588                                                             &iphdr, &hlen)) <= 0) {
 589                                         if (debug)
 590                                                 log(LOG_INFO,
 591                             SPP_FMT "VJ uncompress failed on compressed packet\n",
 592                                                     SPP_ARGS(ifp));
 593                                         goto drop;
 594                                 }
 595
 596                                 /*
 597                                  * Trim the VJ header off the packet, and prepend
 598                                  * the uncompressed IP header (which will usually
 599                                  * end up in two chained mbufs since there's not
 600                                  * enough leading space in the existing mbuf).
 601                                  */
 602                                 m_adj(m, vjlen);
 603                                 M_PREPEND(m, hlen, MB_DONTWAIT);
 604                                 if (m == NULL)
 605                                         goto drop2;
 606                                 bcopy(iphdr, mtod(m, u_char *), hlen);
 607
 608                                 isr = NETISR_IP;
 609                         }
 610                         do_account++;
 611                         break;
 612                 case PPP_VJ_UCOMP:
 613                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 614                                 if (sl_uncompress_tcp_core(mtod(m, u_char *),
 615                                                            m->m_len, m->m_len,
 616                                                            TYPE_UNCOMPRESSED_TCP,
 617                                                            sp->pp_comp,
 618                                                            &iphdr, &hlen) != 0) {
 619                                         if (debug)
 620                                                 log(LOG_INFO,
 621                             SPP_FMT "VJ uncompress failed on uncompressed packet\n",
 622                                                     SPP_ARGS(ifp));
 623                                         goto drop;
 624                                 }
 625                                 isr = NETISR_IP;
 626                         }
 627                         do_account++;
 628                         break;
 629 #endif
 630 #ifdef INET6
 631                 case PPP_IPV6CP:
 632                         if (sp->pp_phase == PHASE_NETWORK)
 633                             sppp_cp_input(&ipv6cp, sp, m);
 634                         m_freem (m);
 635                         return;
 636
 637                 case PPP_IPV6:
 638                         if (sp->state[IDX_IPV6CP] == STATE_OPENED) {
 639                                 isr = NETISR_IPV6;
 640                         }
 641                         do_account++;
 642                         break;
 643 #endif
 644 #ifdef IPX
 645                 case PPP_IPX:
 646                         /* IPX IPXCP not implemented yet */
 647                         if (sp->pp_phase == PHASE_NETWORK) {
 648                                 isr = NETISR_IPX;
 649                         }
 650                         do_account++;
 651                         break;
 652 #endif
 653                 }
 654                 break;
 655         case CISCO_MULTICAST:
 656         case CISCO_UNICAST:
 657                 /* Don't check the control field here (RFC 1547). */
 658                 if (sp->pp_mode != IFF_CISCO) {
 659                         if (debug)
 660                                 log(LOG_DEBUG,
 661                                     SPP_FMT "Cisco packet in PPP mode "
 662                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 663                                     SPP_ARGS(ifp),
 664                                     h->address, h->control, ntohs(h->protocol));
 665                         goto drop;
 666                 }
 667                 switch (ntohs (h->protocol)) {
 668                 default:
 669                         ++ifp->if_noproto;
 670                         goto invalid;
 671                 case CISCO_KEEPALIVE:
 672                         sppp_cisco_input ((struct sppp*) ifp, m);
 673                         m_freem (m);
 674                         return;
 675 #ifdef INET
 676                 case ETHERTYPE_IP:
 677                         isr = NETISR_IP;
 678                         do_account++;
 679                         break;
 680 #endif
 681 #ifdef INET6
 682                 case ETHERTYPE_IPV6:
 683                         isr = NETISR_IPV6;
 684                         do_account++;
 685                         break;
 686 #endif
 687 #ifdef IPX
 688                 case ETHERTYPE_IPX:
 689                         isr = NETISR_IPX;
 690                         do_account++;
 691                         break;
 692 #endif
 693                 }
 694                 break;
 695         default:        /* Invalid PPP packet. */
 696           invalid:
 697                 if (debug)
 698                         log(LOG_DEBUG,
 699                             SPP_FMT "invalid input packet "
 700                             "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 701                             SPP_ARGS(ifp),
 702                             h->address, h->control, ntohs(h->protocol));
 703                 goto drop;
 704         }
 705
 706         if (! (ifp->if_flags & IFF_UP) || isr < 0)
 707                 goto drop;
 708
 709         /* Check queue. */
 710
 711         netisr_queue(isr, m);
 712
 713         /*
 714          * Do only account for network packets, not for control
 715          * packets.  This is used by some subsystems to detect
 716          * idle lines.
 717          */
 718         if (do_account)
 719                 sp->pp_last_recv = time_second;
 720 }
 721
 722 /*
 723  * Enqueue transmit packet.
 724  */
 725 static int
 726 sppp_output_serialized(struct ifnet *ifp, struct mbuf *m,
 727                        struct sockaddr *dst, struct rtentry *rt)
 728 {
 729         struct sppp *sp = (struct sppp*) ifp;
 730         struct ppp_header *h;
 731         struct ifqueue *ifq = NULL;
 732         int rv = 0;
 733         int ipproto = PPP_IP;
 734         int debug = ifp->if_flags & IFF_DEBUG;
 735         struct altq_pktattr pktattr;
 736
 737         crit_enter();
 738
 739         if ((ifp->if_flags & IFF_UP) == 0 ||
 740             (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) {
 741 #ifdef INET6
 742           drop:
 743 #endif
 744                 m_freem (m);
 745                 crit_exit();
 746                 return (ENETDOWN);
 747         }
 748
 749         if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) {
 750 #ifdef INET6
 751                 /*
 752                  * XXX
 753                  *
 754                  * Hack to prevent the initialization-time generated
 755                  * IPv6 multicast packet to erroneously cause a
 756                  * dialout event in case IPv6 has been
 757                  * administratively disabled on that interface.
 758                  */
 759                 if (dst->sa_family == AF_INET6 &&
 760                     !(sp->confflags & CONF_ENABLE_IPV6))
 761                         goto drop;
 762 #endif
 763                 /*
 764                  * Interface is not yet running, but auto-dial.  Need
 765                  * to start LCP for it.
 766                  */
 767                 ifp->if_flags |= IFF_RUNNING;
 768                 crit_exit();
 769                 lcp.Open(sp);
 770                 crit_enter();
 771         }
 772
 773         /*
 774          * if the queueing discipline needs packet classification,
 775          * do it before prepending link headers.
 776          */
 777         ifq_classify(&ifp->if_snd, m, dst->sa_family, &pktattr);
 778
 779 #ifdef INET
 780         if (dst->sa_family == AF_INET) {
 781                 /* XXX Check mbuf length here? */
 782                 struct ip *ip = mtod (m, struct ip*);
 783                 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
 784
 785                 /*
 786                  * When using dynamic local IP address assignment by using
 787                  * 0.0.0.0 as a local address, the first TCP session will
 788                  * not connect because the local TCP checksum is computed
 789                  * using 0.0.0.0 which will later become our real IP address
 790                  * so the TCP checksum computed at the remote end will
 791                  * become invalid. So we
 792                  * - don't let packets with src ip addr 0 thru
 793                  * - we flag TCP packets with src ip 0 as an error
 794                  */
 795
 796                 if(ip->ip_src.s_addr == INADDR_ANY)     /* -hm */
 797                 {
 798                         m_freem(m);
 799                         crit_exit();
 800                         if(ip->ip_p == IPPROTO_TCP)
 801                                 return(EADDRNOTAVAIL);
 802                         else
 803                                 return(0);
 804                 }
 805
 806                 /*
 807                  * Put low delay, telnet, rlogin and ftp control packets
 808                  * in front of the queue.
 809                  */
 810                 if (IF_QFULL (&sp->pp_fastq))
 811                         ;
 812                 else if (ip->ip_tos & IPTOS_LOWDELAY)
 813                         ifq = &sp->pp_fastq;
 814                 else if (m->m_len < sizeof *ip + sizeof *tcp)
 815                         ;
 816                 else if (ip->ip_p != IPPROTO_TCP)
 817                         ;
 818                 else if (INTERACTIVE (ntohs (tcp->th_sport)))
 819                         ifq = &sp->pp_fastq;
 820                 else if (INTERACTIVE (ntohs (tcp->th_dport)))
 821                         ifq = &sp->pp_fastq;
 822
 823                 /*
 824                  * Do IP Header compression
 825                  */
 826                 if (sp->pp_mode != IFF_CISCO && (sp->ipcp.flags & IPCP_VJ) &&
 827                     ip->ip_p == IPPROTO_TCP)
 828                         switch (sl_compress_tcp(m, ip, sp->pp_comp,
 829                                                 sp->ipcp.compress_cid)) {
 830                         case TYPE_COMPRESSED_TCP:
 831                                 ipproto = PPP_VJ_COMP;
 832                                 break;
 833                         case TYPE_UNCOMPRESSED_TCP:
 834                                 ipproto = PPP_VJ_UCOMP;
 835                                 break;
 836                         case TYPE_IP:
 837                                 ipproto = PPP_IP;
 838                                 break;
 839                         default:
 840                                 m_freem(m);
 841                                 crit_exit();
 842                                 return (EINVAL);
 843                         }
 844         }
 845 #endif
 846
 847 #ifdef INET6
 848         if (dst->sa_family == AF_INET6) {
 849                 /* XXX do something tricky here? */
 850         }
 851 #endif
 852
 853         /*
 854          * Prepend general data packet PPP header. For now, IP only.
 855          */
 856         M_PREPEND (m, PPP_HEADER_LEN, MB_DONTWAIT);
 857         if (! m) {
 858                 if (debug)
 859                         log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
 860                                 SPP_ARGS(ifp));
 861                 ++ifp->if_oerrors;
 862                 crit_exit();
 863                 return (ENOBUFS);
 864         }
 865         /*
 866          * May want to check size of packet
 867          * (albeit due to the implementation it's always enough)
 868          */
 869         h = mtod (m, struct ppp_header*);
 870         if (sp->pp_mode == IFF_CISCO) {
 871                 h->address = CISCO_UNICAST;        /* unicast address */
 872                 h->control = 0;
 873         } else {
 874                 h->address = PPP_ALLSTATIONS;        /* broadcast address */
 875                 h->control = PPP_UI;                 /* Unnumbered Info */
 876         }
 877
 878         switch (dst->sa_family) {
 879 #ifdef INET
 880         case AF_INET:   /* Internet Protocol */
 881                 if (sp->pp_mode == IFF_CISCO)
 882                         h->protocol = htons (ETHERTYPE_IP);
 883                 else {
 884                         /*
 885                          * Don't choke with an ENETDOWN early.  It's
 886                          * possible that we just started dialing out,
 887                          * so don't drop the packet immediately.  If
 888                          * we notice that we run out of buffer space
 889                          * below, we will however remember that we are
 890                          * not ready to carry IP packets, and return
 891                          * ENETDOWN, as opposed to ENOBUFS.
 892                          */
 893                         h->protocol = htons(ipproto);
 894                         if (sp->state[IDX_IPCP] != STATE_OPENED)
 895                                 rv = ENETDOWN;
 896                 }
 897                 break;
 898 #endif
 899 #ifdef INET6
 900         case AF_INET6:   /* Internet Protocol */
 901                 if (sp->pp_mode == IFF_CISCO)
 902                         h->protocol = htons (ETHERTYPE_IPV6);
 903                 else {
 904                         /*
 905                          * Don't choke with an ENETDOWN early.  It's
 906                          * possible that we just started dialing out,
 907                          * so don't drop the packet immediately.  If
 908                          * we notice that we run out of buffer space
 909                          * below, we will however remember that we are
 910                          * not ready to carry IP packets, and return
 911                          * ENETDOWN, as opposed to ENOBUFS.
 912                          */
 913                         h->protocol = htons(PPP_IPV6);
 914                         if (sp->state[IDX_IPV6CP] != STATE_OPENED)
 915                                 rv = ENETDOWN;
 916                 }
 917                 break;
 918 #endif
 919 #ifdef IPX
 920         case AF_IPX:     /* Novell IPX Protocol */
 921                 h->protocol = htons (sp->pp_mode == IFF_CISCO ?
 922                         ETHERTYPE_IPX : PPP_IPX);
 923                 break;
 924 #endif
 925         default:
 926                 m_freem (m);
 927                 ++ifp->if_oerrors;
 928                 crit_exit();
 929                 return (EAFNOSUPPORT);
 930         }
 931
 932         /*
 933          * Queue message on interface, and start output if interface
 934          * not yet active.
 935          */
 936         if (ifq != NULL) {
 937                 if (IF_QFULL(ifq)) {
 938                         IF_DROP(ifq);
 939                         m_freem(m);
 940                         rv = ENOBUFS;
 941                         ifq->ifq_drops++;
 942                 } else {
 943                         IF_ENQUEUE(ifq, m);
 944                         rv = 0;
 945                 }
 946         } else {
 947                 rv = ifq_enqueue(&ifp->if_snd, m, &pktattr);
 948         }
 949         if (rv) {
 950                 ++ifp->if_oerrors;
 951                 crit_exit();
 952                 return(rv);
 953         }
 954         if (! (ifp->if_flags & IFF_OACTIVE))
 955                 (*ifp->if_start) (ifp);
 956
 957         /*
 958          * Count output packets and bytes.
 959          * The packet length includes header, FCS and 1 flag,
 960          * according to RFC 1333.
 961          */
 962         ifp->if_obytes += m->m_pkthdr.len + 3;
 963
 964         /*
 965          * Unlike in sppp_input(), we can always bump the timestamp
 966          * here since sppp_output() is only called on behalf of
 967          * network-layer traffic; control-layer traffic is handled
 968          * by sppp_cp_send().
 969          */
 970         sp->pp_last_sent = time_second;
 971
 972         crit_exit();
 973         return (0);
 974 }
 975
 976 static int
 977 sppp_output(struct ifnet *ifp, struct mbuf *m,
 978             struct sockaddr *dst, struct rtentry *rt)
 979 {
 980         int error;
 981
 982         ifnet_serialize_tx(ifp);
 983         error = sppp_output_serialized(ifp, m, dst, rt);
 984         ifnet_deserialize_tx(ifp);
 985
 986         return error;
 987 }
 988
 989 void
 990 sppp_attach(struct ifnet *ifp)
 991 {
 992         struct sppp *sp = (struct sppp*) ifp;
 993
 994         /* Initialize keepalive handler. */
 995         if (!spppq) {
 996                 callout_reset(&keepalive_timeout, hz * 10,
 997                                 sppp_keepalive, NULL);
 998         }
 999         /* Insert new entry into the keepalive list. */
1000         sp->pp_next = spppq;
1001         spppq = sp;
1002
1003         sp->pp_if.if_mtu = PP_MTU;
1004         sp->pp_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
1005         sp->pp_if.if_type = IFT_PPP;
1006         sp->pp_if.if_output = sppp_output;
1007 #if 0
1008         sp->pp_flags = PP_KEEPALIVE;
1009 #endif
1010         sp->pp_if.if_snd.ifq_maxlen = 32;
1011         sp->pp_fastq.ifq_maxlen = 32;
1012         sp->pp_cpq.ifq_maxlen = 20;
1013         sp->pp_loopcnt = 0;
1014         sp->pp_alivecnt = 0;
1015         bzero(&sp->pp_seq[0], sizeof(sp->pp_seq));
1016         bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq));
1017         sp->pp_phase = PHASE_DEAD;
1018         sp->pp_up = lcp.Up;
1019         sp->pp_down = lcp.Down;
1020         sp->pp_last_recv = sp->pp_last_sent = time_second;
1021         sp->confflags = 0;
1022 #ifdef INET
1023         sp->confflags |= CONF_ENABLE_VJ;
1024 #endif
1025 #ifdef INET6
1026         sp->confflags |= CONF_ENABLE_IPV6;
1027 #endif
1028         sp->pp_comp = kmalloc(sizeof(struct slcompress), M_TEMP, M_WAITOK);
1029         sl_compress_init(sp->pp_comp, -1);
1030         sppp_lcp_init(sp);
1031         sppp_ipcp_init(sp);
1032         sppp_ipv6cp_init(sp);
1033         sppp_pap_init(sp);
1034         sppp_chap_init(sp);
1035 }
1036
1037 void
1038 sppp_detach(struct ifnet *ifp)
1039 {
1040         struct sppp **q, *p, *sp = (struct sppp*) ifp;
1041         int i;
1042
1043         /* Remove the entry from the keepalive list. */
1044         for (q = &spppq; (p = *q); q = &p->pp_next)
1045                 if (p == sp) {
1046                         *q = p->pp_next;
1047                         break;
1048                 }
1049
1050         /* Stop keepalive handler. */
1051         if (!spppq)
1052                 callout_stop(&keepalive_timeout);
1053
1054         for (i = 0; i < IDX_COUNT; i++)
1055                 callout_stop(&sp->timeout[i]);
1056         callout_stop(&sp->pap_my_to);
1057 }
1058
1059 /*
1060  * Flush the interface output queue.
1061  */
1062 void
1063 sppp_flush(struct ifnet *ifp)
1064 {
1065         struct sppp *sp = (struct sppp*) ifp;
1066
1067         ifq_purge(&sp->pp_if.if_snd);
1068         IF_DRAIN(&sp->pp_fastq);
1069         IF_DRAIN(&sp->pp_cpq);
1070 }
1071
1072 /*
1073  * Check if the output queue is empty.
1074  */
1075 int
1076 sppp_isempty(struct ifnet *ifp)
1077 {
1078         struct sppp *sp = (struct sppp*) ifp;
1079         int empty;
1080
1081         crit_enter();
1082         empty = IF_QEMPTY(&sp->pp_fastq) && IF_QEMPTY(&sp->pp_cpq) &&
1083                 ifq_is_empty(&sp->pp_if.if_snd);
1084         crit_exit();
1085         return (empty);
1086 }
1087
1088 /*
1089  * Get next packet to send.
1090  */
1091 struct mbuf *
1092 sppp_dequeue(struct ifnet *ifp)
1093 {
1094         struct sppp *sp = (struct sppp*) ifp;
1095         struct mbuf *m;
1096
1097         crit_enter();
1098
1099         /*
1100          * Process only the control protocol queue until we have at
1101          * least one NCP open.
1102          *
1103          * Do always serve all three queues in Cisco mode.
1104          */
1105         IF_DEQUEUE(&sp->pp_cpq, m);
1106         if (m == NULL &&
1107             (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO)) {
1108                 IF_DEQUEUE(&sp->pp_fastq, m);
1109                 if (m == NULL)
1110                         m = ifq_dequeue(&sp->pp_if.if_snd, NULL);
1111         }
1112
1113         crit_exit();
1114         return m;
1115 }
1116
1117 /*
1118  * Pick the next packet, do not remove it from the queue.
1119  */
1120 struct mbuf *
1121 sppp_pick(struct ifnet *ifp)
1122 {
1123         struct sppp *sp = (struct sppp*)ifp;
1124         struct mbuf *m;
1125
1126         crit_enter();
1127
1128         m = sp->pp_cpq.ifq_head;
1129         if (m == NULL &&
1130             (sp->pp_phase == PHASE_NETWORK || sp->pp_mode == IFF_CISCO)) {
1131                 if ((m = sp->pp_fastq.ifq_head) == NULL)
1132                         m = ifq_poll(&sp->pp_if.if_snd);
1133         }
1134
1135         crit_exit();
1136         return (m);
1137 }
1138
1139 /*
1140  * Process an ioctl request.  Called on low priority level.
1141  */
1142 int
1143 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
1144 {
1145         struct ifreq *ifr = (struct ifreq*) data;
1146         struct sppp *sp = (struct sppp*) ifp;
1147         int rv, going_up, going_down, newmode;
1148
1149         crit_enter();
1150
1151         rv = 0;
1152         switch (cmd) {
1153         case SIOCAIFADDR:
1154         case SIOCSIFDSTADDR:
1155                 break;
1156
1157         case SIOCSIFADDR:
1158                 /* set the interface "up" when assigning an IP address */
1159                 ifp->if_flags |= IFF_UP;
1160                 /* fall through... */
1161
1162         case SIOCSIFFLAGS:
1163                 going_up = ifp->if_flags & IFF_UP &&
1164                         (ifp->if_flags & IFF_RUNNING) == 0;
1165                 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1166                         ifp->if_flags & IFF_RUNNING;
1167
1168                 newmode = ifp->if_flags & IFF_PASSIVE;
1169                 if (!newmode)
1170                         newmode = ifp->if_flags & IFF_AUTO;
1171                 if (!newmode)
1172                         newmode = ifp->if_flags & IFF_CISCO;
1173                 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
1174                 ifp->if_flags |= newmode;
1175
1176                 if (newmode != sp->pp_mode) {
1177                         going_down = 1;
1178                         if (!going_up)
1179                                 going_up = ifp->if_flags & IFF_RUNNING;
1180                 }
1181
1182                 if (going_down) {
1183                         if (sp->pp_mode != IFF_CISCO)
1184                                 lcp.Close(sp);
1185                         else if (sp->pp_tlf)
1186                                 (sp->pp_tlf)(sp);
1187                         sppp_flush(ifp);
1188                         ifp->if_flags &= ~IFF_RUNNING;
1189                         sp->pp_mode = newmode;
1190                 }
1191
1192                 if (going_up) {
1193                         if (sp->pp_mode != IFF_CISCO)
1194                                 lcp.Close(sp);
1195                         sp->pp_mode = newmode;
1196                         if (sp->pp_mode == 0) {
1197                                 ifp->if_flags |= IFF_RUNNING;
1198                                 lcp.Open(sp);
1199                         }
1200                         if (sp->pp_mode == IFF_CISCO) {
1201                                 if (sp->pp_tls)
1202                                         (sp->pp_tls)(sp);
1203                                 ifp->if_flags |= IFF_RUNNING;
1204                         }
1205                 }
1206
1207                 break;
1208
1209 #ifdef SIOCSIFMTU
1210 #ifndef ifr_mtu
1211 #define ifr_mtu ifr_metric
1212 #endif
1213         case SIOCSIFMTU:
1214                 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
1215                         return (EINVAL);
1216                 ifp->if_mtu = ifr->ifr_mtu;
1217                 break;
1218 #endif
1219 #ifdef SLIOCSETMTU
1220         case SLIOCSETMTU:
1221                 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
1222                         return (EINVAL);
1223                 ifp->if_mtu = *(short*)data;
1224                 break;
1225 #endif
1226 #ifdef SIOCGIFMTU
1227         case SIOCGIFMTU:
1228                 ifr->ifr_mtu = ifp->if_mtu;
1229                 break;
1230 #endif
1231 #ifdef SLIOCGETMTU
1232         case SLIOCGETMTU:
1233                 *(short*)data = ifp->if_mtu;
1234                 break;
1235 #endif
1236         case SIOCADDMULTI:
1237         case SIOCDELMULTI:
1238                 break;
1239
1240         case SIOCGIFGENERIC:
1241         case SIOCSIFGENERIC:
1242                 rv = sppp_params(sp, cmd, data);
1243                 break;
1244
1245         default:
1246                 rv = ENOTTY;
1247         }
1248
1249         crit_exit();
1250         return rv;
1251 }
1252
1253 /*
1254  * Cisco framing implementation.
1255  */
1256
1257 /*
1258  * Handle incoming Cisco keepalive protocol packets.
1259  */
1260 static void
1261 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1262 {
1263         STDDCL;
1264         struct cisco_packet *h;
1265         u_long me, mymask;
1266
1267         if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1268                 if (debug)
1269                         log(LOG_DEBUG,
1270                             SPP_FMT "cisco invalid packet length: %d bytes\n",
1271                             SPP_ARGS(ifp), m->m_pkthdr.len);
1272                 return;
1273         }
1274         h = mtod (m, struct cisco_packet*);
1275         if (debug)
1276                 log(LOG_DEBUG,
1277                     SPP_FMT "cisco input: %d bytes "
1278                     "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1279                     SPP_ARGS(ifp), m->m_pkthdr.len,
1280                     (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
1281                     (u_int)h->time0, (u_int)h->time1);
1282         switch (ntohl (h->type)) {
1283         default:
1284                 if (debug)
1285                         log(-1, SPP_FMT "cisco unknown packet type: 0x%lx\n",
1286                                SPP_ARGS(ifp), (u_long)ntohl (h->type));
1287                 break;
1288         case CISCO_ADDR_REPLY:
1289                 /* Reply on address request, ignore */
1290                 break;
1291         case CISCO_KEEPALIVE_REQ:
1292                 sp->pp_alivecnt = 0;
1293                 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
1294                 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1295                         /* Local and remote sequence numbers are equal.
1296                          * Probably, the line is in loopback mode. */
1297                         if (sp->pp_loopcnt >= MAXALIVECNT) {
1298                                 kprintf (SPP_FMT "loopback\n",
1299                                         SPP_ARGS(ifp));
1300                                 sp->pp_loopcnt = 0;
1301                                 if (ifp->if_flags & IFF_UP) {
1302                                         if_down (ifp);
1303                                         IF_DRAIN(&sp->pp_cpq);
1304                                 }
1305                         }
1306                         ++sp->pp_loopcnt;
1307
1308                         /* Generate new local sequence number */
1309 #if defined(__DragonFly__)
1310                         sp->pp_seq[IDX_LCP] = krandom();
1311 #else
1312                         sp->pp_seq[IDX_LCP] ^= time.tv_sec ^ time.tv_usec;
1313 #endif
1314                         break;
1315                 }
1316                 sp->pp_loopcnt = 0;
1317                 if (! (ifp->if_flags & IFF_UP) &&
1318                     (ifp->if_flags & IFF_RUNNING)) {
1319                         if_up(ifp);
1320                         kprintf (SPP_FMT "up\n", SPP_ARGS(ifp));
1321                 }
1322                 break;
1323         case CISCO_ADDR_REQ:
1324                 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1325                 if (me != 0L)
1326                         sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1327                 break;
1328         }
1329 }
1330
1331 /*
1332  * Send Cisco keepalive packet.
1333  */
1334 static void
1335 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1336 {
1337         STDDCL;
1338         struct ppp_header *h;
1339         struct cisco_packet *ch;
1340         struct mbuf *m;
1341 #if defined(__DragonFly__)
1342         struct timeval tv;
1343 #else
1344         u_long t = (time.tv_sec - boottime.tv_sec) * 1000;
1345 #endif
1346
1347 #if defined(__DragonFly__)
1348         getmicrouptime(&tv);
1349 #endif
1350
1351         MGETHDR (m, MB_DONTWAIT, MT_DATA);
1352         if (! m)
1353                 return;
1354         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1355         m->m_pkthdr.rcvif = 0;
1356
1357         h = mtod (m, struct ppp_header*);
1358         h->address = CISCO_MULTICAST;
1359         h->control = 0;
1360         h->protocol = htons (CISCO_KEEPALIVE);
1361
1362         ch = (struct cisco_packet*) (h + 1);
1363         ch->type = htonl (type);
1364         ch->par1 = htonl (par1);
1365         ch->par2 = htonl (par2);
1366         ch->rel = -1;
1367
1368 #if defined(__DragonFly__)
1369         ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1370         ch->time1 = htons ((u_short) tv.tv_sec);
1371 #else
1372         ch->time0 = htons ((u_short) (t >> 16));
1373         ch->time1 = htons ((u_short) t);
1374 #endif
1375
1376         if (debug)
1377                 log(LOG_DEBUG,
1378                     SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1379                         SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
1380                         (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1381
1382         if (IF_QFULL (&sp->pp_cpq)) {
1383                 IF_DROP (&sp->pp_fastq);
1384                 IF_DROP (&ifp->if_snd);
1385                 m_freem (m);
1386         } else
1387                 IF_ENQUEUE (&sp->pp_cpq, m);
1388         if (! (ifp->if_flags & IFF_OACTIVE))
1389                 (*ifp->if_start) (ifp);
1390         ifp->if_obytes += m->m_pkthdr.len + 3;
1391 }
1392
1393 /*
1394  * PPP protocol implementation.
1395  */
1396
1397 /*
1398  * Send PPP control protocol packet.
1399  */
1400 static void
1401 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1402              u_char ident, u_short len, void *data)
1403 {
1404         STDDCL;
1405         struct ppp_header *h;
1406         struct lcp_header *lh;
1407         struct mbuf *m;
1408
1409         if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1410                 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1411         MGETHDR (m, MB_DONTWAIT, MT_DATA);
1412         if (! m)
1413                 return;
1414         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1415         m->m_pkthdr.rcvif = 0;
1416
1417         h = mtod (m, struct ppp_header*);
1418         h->address = PPP_ALLSTATIONS;        /* broadcast address */
1419         h->control = PPP_UI;                 /* Unnumbered Info */
1420         h->protocol = htons (proto);         /* Link Control Protocol */
1421
1422         lh = (struct lcp_header*) (h + 1);
1423         lh->type = type;
1424         lh->ident = ident;
1425         lh->len = htons (LCP_HEADER_LEN + len);
1426         if (len)
1427                 bcopy (data, lh+1, len);
1428
1429         if (debug) {
1430                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1431                     SPP_ARGS(ifp),
1432                     sppp_proto_name(proto),
1433                     sppp_cp_type_name (lh->type), lh->ident,
1434                     ntohs (lh->len));
1435                 sppp_print_bytes ((u_char*) (lh+1), len);
1436                 log(-1, ">\n");
1437         }
1438         if (IF_QFULL (&sp->pp_cpq)) {
1439                 IF_DROP (&sp->pp_fastq);
1440                 IF_DROP (&ifp->if_snd);
1441                 m_freem (m);
1442                 ++ifp->if_oerrors;
1443         } else
1444                 IF_ENQUEUE (&sp->pp_cpq, m);
1445         if (! (ifp->if_flags & IFF_OACTIVE))
1446                 (*ifp->if_start) (ifp);
1447         ifp->if_obytes += m->m_pkthdr.len + 3;
1448 }
1449
1450 /*
1451  * Handle incoming PPP control protocol packets.
1452  */
1453 static void
1454 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1455 {
1456         STDDCL;
1457         struct lcp_header *h;
1458         int printlen, len = m->m_pkthdr.len;
1459         int rv;
1460         u_char *p;
1461
1462         if (len < 4) {
1463                 if (debug)
1464                         log(LOG_DEBUG,
1465                             SPP_FMT "%s invalid packet length: %d bytes\n",
1466                             SPP_ARGS(ifp), cp->name, len);
1467                 return;
1468         }
1469         h = mtod (m, struct lcp_header*);
1470         if (debug) {
1471                 printlen = ntohs(h->len);
1472                 log(LOG_DEBUG,
1473                     SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1474                     SPP_ARGS(ifp), cp->name,
1475                     sppp_state_name(sp->state[cp->protoidx]),
1476                     sppp_cp_type_name (h->type), h->ident, printlen);
1477                 if (len < printlen)
1478                         printlen = len;
1479                 if (printlen > 4)
1480                         sppp_print_bytes ((u_char*) (h+1), printlen - 4);
1481                 log(-1, ">\n");
1482         }
1483         if (len > ntohs (h->len))
1484                 len = ntohs (h->len);
1485         p = (u_char *)(h + 1);
1486         switch (h->type) {
1487         case CONF_REQ:
1488                 if (len < 4) {
1489                         if (debug)
1490                                 log(-1, SPP_FMT "%s invalid conf-req length %d\n",
1491                                        SPP_ARGS(ifp), cp->name,
1492                                        len);
1493                         ++ifp->if_ierrors;
1494                         break;
1495                 }
1496                 /* handle states where RCR doesn't get a SCA/SCN */
1497                 switch (sp->state[cp->protoidx]) {
1498                 case STATE_CLOSING:
1499                 case STATE_STOPPING:
1500                         return;
1501                 case STATE_CLOSED:
1502                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1503                                      0, 0);
1504                         return;
1505                 }
1506                 rv = (cp->RCR)(sp, h, len);
1507                 if (rv < 0) {
1508                         /* fatal error, shut down */
1509                         (cp->tld)(sp);
1510                         sppp_lcp_tlf(sp);
1511                         return;
1512                 }
1513                 switch (sp->state[cp->protoidx]) {
1514                 case STATE_OPENED:
1515                         (cp->tld)(sp);
1516                         (cp->scr)(sp);
1517                         /* fall through... */
1518                 case STATE_ACK_SENT:
1519                 case STATE_REQ_SENT:
1520                         /*
1521                          * sppp_cp_change_state() have the side effect of
1522                          * restarting the timeouts. We want to avoid that
1523                          * if the state don't change, otherwise we won't
1524                          * ever timeout and resend a configuration request
1525                          * that got lost.
1526                          */
1527                         if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
1528                             STATE_REQ_SENT))
1529                                 break;
1530                         sppp_cp_change_state(cp, sp, rv?
1531                                              STATE_ACK_SENT: STATE_REQ_SENT);
1532                         break;
1533                 case STATE_STOPPED:
1534                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1535                         (cp->scr)(sp);
1536                         sppp_cp_change_state(cp, sp, rv?
1537                                              STATE_ACK_SENT: STATE_REQ_SENT);
1538                         break;
1539                 case STATE_ACK_RCVD:
1540                         if (rv) {
1541                                 sppp_cp_change_state(cp, sp, STATE_OPENED);
1542                                 if (debug)
1543                                         log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1544                                             SPP_ARGS(ifp),
1545                                             cp->name);
1546                                 (cp->tlu)(sp);
1547                         } else
1548                                 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1549                         break;
1550                 default:
1551                         kprintf(SPP_FMT "%s illegal %s in state %s\n",
1552                                SPP_ARGS(ifp), cp->name,
1553                                sppp_cp_type_name(h->type),
1554                                sppp_state_name(sp->state[cp->protoidx]));
1555                         ++ifp->if_ierrors;
1556                 }
1557                 break;
1558         case CONF_ACK:
1559                 if (h->ident != sp->confid[cp->protoidx]) {
1560                         if (debug)
1561                                 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1562                                        SPP_ARGS(ifp), cp->name,
1563                                        h->ident, sp->confid[cp->protoidx]);
1564                         ++ifp->if_ierrors;
1565                         break;
1566                 }
1567                 switch (sp->state[cp->protoidx]) {
1568                 case STATE_CLOSED:
1569                 case STATE_STOPPED:
1570                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1571                         break;
1572                 case STATE_CLOSING:
1573                 case STATE_STOPPING:
1574                         break;
1575                 case STATE_REQ_SENT:
1576                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1577                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1578                         break;
1579                 case STATE_OPENED:
1580                         (cp->tld)(sp);
1581                         /* fall through */
1582                 case STATE_ACK_RCVD:
1583                         (cp->scr)(sp);
1584                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1585                         break;
1586                 case STATE_ACK_SENT:
1587                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1588                         sppp_cp_change_state(cp, sp, STATE_OPENED);
1589                         if (debug)
1590                                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1591                                        SPP_ARGS(ifp), cp->name);
1592                         (cp->tlu)(sp);
1593                         break;
1594                 default:
1595                         kprintf(SPP_FMT "%s illegal %s in state %s\n",
1596                                SPP_ARGS(ifp), cp->name,
1597                                sppp_cp_type_name(h->type),
1598                                sppp_state_name(sp->state[cp->protoidx]));
1599                         ++ifp->if_ierrors;
1600                 }
1601                 break;
1602         case CONF_NAK:
1603         case CONF_REJ:
1604                 if (h->ident != sp->confid[cp->protoidx]) {
1605                         if (debug)
1606                                 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1607                                        SPP_ARGS(ifp), cp->name,
1608                                        h->ident, sp->confid[cp->protoidx]);
1609                         ++ifp->if_ierrors;
1610                         break;
1611                 }
1612                 if (h->type == CONF_NAK)
1613                         (cp->RCN_nak)(sp, h, len);
1614                 else /* CONF_REJ */
1615                         (cp->RCN_rej)(sp, h, len);
1616
1617                 switch (sp->state[cp->protoidx]) {
1618                 case STATE_CLOSED:
1619                 case STATE_STOPPED:
1620                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1621                         break;
1622                 case STATE_REQ_SENT:
1623                 case STATE_ACK_SENT:
1624                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1625                         /*
1626                          * Slow things down a bit if we think we might be
1627                          * in loopback. Depend on the timeout to send the
1628                          * next configuration request.
1629                          */
1630                         if (sp->pp_loopcnt)
1631                                 break;
1632                         (cp->scr)(sp);
1633                         break;
1634                 case STATE_OPENED:
1635                         (cp->tld)(sp);
1636                         /* fall through */
1637                 case STATE_ACK_RCVD:
1638                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1639                         (cp->scr)(sp);
1640                         break;
1641                 case STATE_CLOSING:
1642                 case STATE_STOPPING:
1643                         break;
1644                 default:
1645                         kprintf(SPP_FMT "%s illegal %s in state %s\n",
1646                                SPP_ARGS(ifp), cp->name,
1647                                sppp_cp_type_name(h->type),
1648                                sppp_state_name(sp->state[cp->protoidx]));
1649                         ++ifp->if_ierrors;
1650                 }
1651                 break;
1652
1653         case TERM_REQ:
1654                 switch (sp->state[cp->protoidx]) {
1655                 case STATE_ACK_RCVD:
1656                 case STATE_ACK_SENT:
1657                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1658                         /* fall through */
1659                 case STATE_CLOSED:
1660                 case STATE_STOPPED:
1661                 case STATE_CLOSING:
1662                 case STATE_STOPPING:
1663                 case STATE_REQ_SENT:
1664                   sta:
1665                         /* Send Terminate-Ack packet. */
1666                         if (debug)
1667                                 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1668                                     SPP_ARGS(ifp), cp->name);
1669                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1670                         break;
1671                 case STATE_OPENED:
1672                         (cp->tld)(sp);
1673                         sp->rst_counter[cp->protoidx] = 0;
1674                         sppp_cp_change_state(cp, sp, STATE_STOPPING);
1675                         goto sta;
1676                         break;
1677                 default:
1678                         kprintf(SPP_FMT "%s illegal %s in state %s\n",
1679                                SPP_ARGS(ifp), cp->name,
1680                                sppp_cp_type_name(h->type),
1681                                sppp_state_name(sp->state[cp->protoidx]));
1682                         ++ifp->if_ierrors;
1683                 }
1684                 break;
1685         case TERM_ACK:
1686                 switch (sp->state[cp->protoidx]) {
1687                 case STATE_CLOSED:
1688                 case STATE_STOPPED:
1689                 case STATE_REQ_SENT:
1690                 case STATE_ACK_SENT:
1691                         break;
1692                 case STATE_CLOSING:
1693                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
1694                         (cp->tlf)(sp);
1695                         break;
1696                 case STATE_STOPPING:
1697                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
1698                         (cp->tlf)(sp);
1699                         break;
1700                 case STATE_ACK_RCVD:
1701                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1702                         break;
1703                 case STATE_OPENED:
1704                         (cp->tld)(sp);
1705                         (cp->scr)(sp);
1706                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1707                         break;
1708                 default:
1709                         kprintf(SPP_FMT "%s illegal %s in state %s\n",
1710                                SPP_ARGS(ifp), cp->name,
1711                                sppp_cp_type_name(h->type),
1712                                sppp_state_name(sp->state[cp->protoidx]));
1713                         ++ifp->if_ierrors;
1714                 }
1715                 break;
1716         case CODE_REJ:
1717                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1718                 log(LOG_INFO,
1719                     SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1720                     "danger will robinson\n",
1721                     SPP_ARGS(ifp), cp->name,
1722                     sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1723                 switch (sp->state[cp->protoidx]) {
1724                 case STATE_CLOSED:
1725                 case STATE_STOPPED:
1726                 case STATE_REQ_SENT:
1727                 case STATE_ACK_SENT:
1728                 case STATE_CLOSING:
1729                 case STATE_STOPPING:
1730                 case STATE_OPENED:
1731                         break;
1732                 case STATE_ACK_RCVD:
1733                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1734                         break;
1735                 default:
1736                         kprintf(SPP_FMT "%s illegal %s in state %s\n",
1737                                SPP_ARGS(ifp), cp->name,
1738                                sppp_cp_type_name(h->type),
1739                                sppp_state_name(sp->state[cp->protoidx]));
1740                         ++ifp->if_ierrors;
1741                 }
1742                 break;
1743         case PROTO_REJ:
1744             {
1745                 int catastrophic;
1746                 const struct cp *upper;
1747                 int i;
1748                 u_int16_t proto;
1749
1750                 catastrophic = 0;
1751                 upper = NULL;
1752                 proto = ntohs(*((u_int16_t *)p));
1753                 for (i = 0; i < IDX_COUNT; i++) {
1754                         if (cps[i]->proto == proto) {
1755                                 upper = cps[i];
1756                                 break;
1757                         }
1758                 }
1759                 if (upper == NULL)
1760                         catastrophic++;
1761
1762                 if (catastrophic || debug)
1763                         log(catastrophic? LOG_INFO: LOG_DEBUG,
1764                             SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1765                             SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
1766                             sppp_cp_type_name(h->type), proto,
1767                             upper ? upper->name : "unknown",
1768                             upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1769
1770                 /*
1771                  * if we got RXJ+ against conf-req, the peer does not implement
1772                  * this particular protocol type.  terminate the protocol.
1773                  */
1774                 if (upper && !catastrophic) {
1775                         if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1776                                 upper->Close(sp);
1777                                 break;
1778                         }
1779                 }
1780
1781                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1782                 switch (sp->state[cp->protoidx]) {
1783                 case STATE_CLOSED:
1784                 case STATE_STOPPED:
1785                 case STATE_REQ_SENT:
1786                 case STATE_ACK_SENT:
1787                 case STATE_CLOSING:
1788                 case STATE_STOPPING:
1789                 case STATE_OPENED:
1790                         break;
1791                 case STATE_ACK_RCVD:
1792                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1793                         break;
1794                 default:
1795                         kprintf(SPP_FMT "%s illegal %s in state %s\n",
1796                                SPP_ARGS(ifp), cp->name,
1797                                sppp_cp_type_name(h->type),
1798                                sppp_state_name(sp->state[cp->protoidx]));
1799                         ++ifp->if_ierrors;
1800                 }
1801                 break;
1802             }
1803         case DISC_REQ:
1804                 if (cp->proto != PPP_LCP)
1805                         goto illegal;
1806                 /* Discard the packet. */
1807                 break;
1808         case ECHO_REQ:
1809                 if (cp->proto != PPP_LCP)
1810                         goto illegal;
1811                 if (sp->state[cp->protoidx] != STATE_OPENED) {
1812                         if (debug)
1813                                 log(-1, SPP_FMT "lcp echo req but lcp closed\n",
1814                                        SPP_ARGS(ifp));
1815                         ++ifp->if_ierrors;
1816                         break;
1817                 }
1818                 if (len < 8) {
1819                         if (debug)
1820                                 log(-1, SPP_FMT "invalid lcp echo request "
1821                                        "packet length: %d bytes\n",
1822                                        SPP_ARGS(ifp), len);
1823                         break;
1824                 }
1825                 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
1826                     ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1827                         /* Line loopback mode detected. */
1828                         kprintf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1829                         sp->pp_loopcnt = MAXALIVECNT * 5;
1830                         if_down (ifp);
1831                         IF_DRAIN(&sp->pp_cpq);
1832
1833                         /* Shut down the PPP link. */
1834                         /* XXX */
1835                         lcp.Down(sp);
1836                         lcp.Up(sp);
1837                         break;
1838                 }
1839                 *(long*)(h+1) = htonl (sp->lcp.magic);
1840                 if (debug)
1841                         log(-1, SPP_FMT "got lcp echo req, sending echo rep\n",
1842                                SPP_ARGS(ifp));
1843                 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1844                 break;
1845         case ECHO_REPLY:
1846                 if (cp->proto != PPP_LCP)
1847                         goto illegal;
1848                 if (h->ident != sp->lcp.echoid) {
1849                         ++ifp->if_ierrors;
1850                         break;
1851                 }
1852                 if (len < 8) {
1853                         if (debug)
1854                                 log(-1, SPP_FMT "lcp invalid echo reply "
1855                                        "packet length: %d bytes\n",
1856                                        SPP_ARGS(ifp), len);
1857                         break;
1858                 }
1859                 if (debug)
1860                         log(-1, SPP_FMT "lcp got echo rep\n",
1861                                SPP_ARGS(ifp));
1862                 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
1863                     ntohl (*(long*)(h+1)) != sp->lcp.magic)
1864                         sp->pp_alivecnt = 0;
1865                 break;
1866         default:
1867                 /* Unknown packet type -- send Code-Reject packet. */
1868           illegal:
1869                 if (debug)
1870                         log(-1, SPP_FMT "%s send code-rej for 0x%x\n",
1871                                SPP_ARGS(ifp), cp->name, h->type);
1872                 sppp_cp_send(sp, cp->proto, CODE_REJ,
1873                              ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1874                 ++ifp->if_ierrors;
1875         }
1876 }
1877
1878
1879 /*
1880  * The generic part of all Up/Down/Open/Close/TO event handlers.
1881  * Basically, the state transition handling in the automaton.
1882  */
1883 static void
1884 sppp_up_event(const struct cp *cp, struct sppp *sp)
1885 {
1886         STDDCL;
1887
1888         if (debug)
1889                 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
1890                     SPP_ARGS(ifp), cp->name,
1891                     sppp_state_name(sp->state[cp->protoidx]));
1892
1893         switch (sp->state[cp->protoidx]) {
1894         case STATE_INITIAL:
1895                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1896                 break;
1897         case STATE_STARTING:
1898                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1899                 (cp->scr)(sp);
1900                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1901                 break;
1902         default:
1903                 kprintf(SPP_FMT "%s illegal up in state %s\n",
1904                        SPP_ARGS(ifp), cp->name,
1905                        sppp_state_name(sp->state[cp->protoidx]));
1906         }
1907 }
1908
1909 static void
1910 sppp_down_event(const struct cp *cp, struct sppp *sp)
1911 {
1912         STDDCL;
1913
1914         if (debug)
1915                 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
1916                     SPP_ARGS(ifp), cp->name,
1917                     sppp_state_name(sp->state[cp->protoidx]));
1918
1919         switch (sp->state[cp->protoidx]) {
1920         case STATE_CLOSED:
1921         case STATE_CLOSING:
1922                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1923                 break;
1924         case STATE_STOPPED:
1925                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1926                 (cp->tls)(sp);
1927                 break;
1928         case STATE_STOPPING:
1929         case STATE_REQ_SENT:
1930         case STATE_ACK_RCVD:
1931         case STATE_ACK_SENT:
1932                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1933                 break;
1934         case STATE_OPENED:
1935                 (cp->tld)(sp);
1936                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1937                 break;
1938         default:
1939                 kprintf(SPP_FMT "%s illegal down in state %s\n",
1940                        SPP_ARGS(ifp), cp->name,
1941                        sppp_state_name(sp->state[cp->protoidx]));
1942         }
1943 }
1944
1945
1946 static void
1947 sppp_open_event(const struct cp *cp, struct sppp *sp)
1948 {
1949         STDDCL;
1950
1951         if (debug)
1952                 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1953                     SPP_ARGS(ifp), cp->name,
1954                     sppp_state_name(sp->state[cp->protoidx]));
1955
1956         switch (sp->state[cp->protoidx]) {
1957         case STATE_INITIAL:
1958                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1959                 (cp->tls)(sp);
1960                 break;
1961         case STATE_STARTING:
1962                 break;
1963         case STATE_CLOSED:
1964                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1965                 (cp->scr)(sp);
1966                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1967                 break;
1968         case STATE_STOPPED:
1969                 /*
1970                  * Try escaping stopped state.  This seems to bite
1971                  * people occasionally, in particular for IPCP,
1972                  * presumably following previous IPCP negotiation
1973                  * aborts.  Somehow, we must have missed a Down event
1974                  * which would have caused a transition into starting
1975                  * state, so as a bandaid we force the Down event now.
1976                  * This effectively implements (something like the)
1977                  * `restart' option mentioned in the state transition
1978                  * table of RFC 1661.
1979                  */
1980                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1981                 (cp->tls)(sp);
1982                 break;
1983         case STATE_STOPPING:
1984         case STATE_REQ_SENT:
1985         case STATE_ACK_RCVD:
1986         case STATE_ACK_SENT:
1987         case STATE_OPENED:
1988                 break;
1989         case STATE_CLOSING:
1990                 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1991                 break;
1992         }
1993 }
1994
1995
1996 static void
1997 sppp_close_event(const struct cp *cp, struct sppp *sp)
1998 {
1999         STDDCL;
2000
2001         if (debug)
2002                 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
2003                     SPP_ARGS(ifp), cp->name,
2004                     sppp_state_name(sp->state[cp->protoidx]));
2005
2006         switch (sp->state[cp->protoidx]) {
2007         case STATE_INITIAL:
2008         case STATE_CLOSED:
2009         case STATE_CLOSING:
2010                 break;
2011         case STATE_STARTING:
2012                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
2013                 (cp->tlf)(sp);
2014                 break;
2015         case STATE_STOPPED:
2016                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2017                 break;
2018         case STATE_STOPPING:
2019                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2020                 break;
2021         case STATE_OPENED:
2022                 (cp->tld)(sp);
2023                 /* fall through */
2024         case STATE_REQ_SENT:
2025         case STATE_ACK_RCVD:
2026         case STATE_ACK_SENT:
2027                 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
2028                 sppp_cp_send(sp, cp->proto, TERM_REQ,
2029                              ++sp->pp_seq[cp->protoidx], 0, 0);
2030                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2031                 break;
2032         }
2033 }
2034
2035 static void
2036 sppp_to_event(const struct cp *cp, struct sppp *sp)
2037 {
2038         STDDCL;
2039
2040         crit_enter();
2041
2042         if (debug)
2043                 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
2044                     SPP_ARGS(ifp), cp->name,
2045                     sppp_state_name(sp->state[cp->protoidx]),
2046                     sp->rst_counter[cp->protoidx]);
2047
2048         if (--sp->rst_counter[cp->protoidx] < 0)
2049                 /* TO- event */
2050                 switch (sp->state[cp->protoidx]) {
2051                 case STATE_CLOSING:
2052                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
2053                         (cp->tlf)(sp);
2054                         break;
2055                 case STATE_STOPPING:
2056                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2057                         (cp->tlf)(sp);
2058                         break;
2059                 case STATE_REQ_SENT:
2060                 case STATE_ACK_RCVD:
2061                 case STATE_ACK_SENT:
2062                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2063                         (cp->tlf)(sp);
2064                         break;
2065                 }
2066         else
2067                 /* TO+ event */
2068                 switch (sp->state[cp->protoidx]) {
2069                 case STATE_CLOSING:
2070                 case STATE_STOPPING:
2071                         sppp_cp_send(sp, cp->proto, TERM_REQ,
2072                                      ++sp->pp_seq[cp->protoidx], 0, 0);
2073                         callout_reset(&sp->timeout[cp->protoidx],
2074                                         sp->lcp.timeout, cp->TO, sp);
2075                         break;
2076                 case STATE_REQ_SENT:
2077                 case STATE_ACK_RCVD:
2078                         (cp->scr)(sp);
2079                         /* sppp_cp_change_state() will restart the timer */
2080                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
2081                         break;
2082                 case STATE_ACK_SENT:
2083                         (cp->scr)(sp);
2084                         callout_reset(&sp->timeout[cp->protoidx],
2085                                         sp->lcp.timeout, cp->TO, sp);
2086                         break;
2087                 }
2088
2089         crit_exit();
2090 }
2091
2092 /*
2093  * Change the state of a control protocol in the state automaton.
2094  * Takes care of starting/stopping the restart timer.
2095  */
2096 void
2097 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
2098 {
2099         sp->state[cp->protoidx] = newstate;
2100         callout_stop(&sp->timeout[cp->protoidx]);
2101
2102         switch (newstate) {
2103         case STATE_INITIAL:
2104         case STATE_STARTING:
2105         case STATE_CLOSED:
2106         case STATE_STOPPED:
2107         case STATE_OPENED:
2108                 break;
2109         case STATE_CLOSING:
2110         case STATE_STOPPING:
2111         case STATE_REQ_SENT:
2112         case STATE_ACK_RCVD:
2113         case STATE_ACK_SENT:
2114                 callout_reset(&sp->timeout[cp->protoidx],
2115                                 sp->lcp.timeout, cp->TO, sp);
2116                 break;
2117         }
2118 }
2119
2120 /*
2121  *--------------------------------------------------------------------------*
2122  *                                                                          *
2123  *                         The LCP implementation.                          *
2124  *                                                                          *
2125  *--------------------------------------------------------------------------*
2126  */
2127 static void
2128 sppp_lcp_init(struct sppp *sp)
2129 {
2130         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2131         sp->lcp.magic = 0;
2132         sp->state[IDX_LCP] = STATE_INITIAL;
2133         sp->fail_counter[IDX_LCP] = 0;
2134         sp->pp_seq[IDX_LCP] = 0;
2135         sp->pp_rseq[IDX_LCP] = 0;
2136         sp->lcp.protos = 0;
2137         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2138
2139         /* Note that these values are  relevant for all control protocols */
2140         sp->lcp.timeout = 3 * hz;
2141         sp->lcp.max_terminate = 2;
2142         sp->lcp.max_configure = 10;
2143         sp->lcp.max_failure = 10;
2144 #if defined(__DragonFly__)
2145         callout_init(&sp->timeout[IDX_LCP]);
2146 #endif
2147 }
2148
2149 static void
2150 sppp_lcp_up(struct sppp *sp)
2151 {
2152         STDDCL;
2153
2154         sp->pp_alivecnt = 0;
2155         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2156         sp->lcp.magic = 0;
2157         sp->lcp.protos = 0;
2158         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2159         /*
2160          * If this interface is passive or dial-on-demand, and we are
2161          * still in Initial state, it means we've got an incoming
2162          * call.  Activate the interface.
2163          */
2164         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2165                 if (debug)
2166                         log(LOG_DEBUG,
2167                             SPP_FMT "Up event", SPP_ARGS(ifp));
2168                 ifp->if_flags |= IFF_RUNNING;
2169                 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2170                         if (debug)
2171                                 log(-1, "(incoming call)\n");
2172                         sp->pp_flags |= PP_CALLIN;
2173                         lcp.Open(sp);
2174                 } else if (debug)
2175                         log(-1, "\n");
2176         } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2177                    (sp->state[IDX_LCP] == STATE_INITIAL)) {
2178                 ifp->if_flags |= IFF_RUNNING;
2179                 lcp.Open(sp);
2180         }
2181
2182         sppp_up_event(&lcp, sp);
2183 }
2184
2185 static void
2186 sppp_lcp_down(struct sppp *sp)
2187 {
2188         STDDCL;
2189
2190         sppp_down_event(&lcp, sp);
2191
2192         /*
2193          * If this is neither a dial-on-demand nor a passive
2194          * interface, simulate an ``ifconfig down'' action, so the
2195          * administrator can force a redial by another ``ifconfig
2196          * up''.  XXX For leased line operation, should we immediately
2197          * try to reopen the connection here?
2198          */
2199         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2200                 log(LOG_INFO,
2201                     SPP_FMT "Down event, taking interface down.\n",
2202                     SPP_ARGS(ifp));
2203                 if_down(ifp);
2204         } else {
2205                 if (debug)
2206                         log(LOG_DEBUG,
2207                             SPP_FMT "Down event (carrier loss)\n",
2208                             SPP_ARGS(ifp));
2209                 sp->pp_flags &= ~PP_CALLIN;
2210                 if (sp->state[IDX_LCP] != STATE_INITIAL)
2211                         lcp.Close(sp);
2212                 ifp->if_flags &= ~IFF_RUNNING;
2213         }
2214 }
2215
2216 static void
2217 sppp_lcp_open(struct sppp *sp)
2218 {
2219         /*
2220          * If we are authenticator, negotiate LCP_AUTH
2221          */
2222         if (sp->hisauth.proto != 0)
2223                 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2224         else
2225                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2226         sp->pp_flags &= ~PP_NEEDAUTH;
2227         sppp_open_event(&lcp, sp);
2228 }
2229
2230 static void
2231 sppp_lcp_close(struct sppp *sp)
2232 {
2233         sppp_close_event(&lcp, sp);
2234 }
2235
2236 static void
2237 sppp_lcp_TO(void *cookie)
2238 {
2239         sppp_to_event(&lcp, (struct sppp *)cookie);
2240 }
2241
2242 /*
2243  * Analyze a configure request.  Return true if it was agreeable, and
2244  * caused action sca, false if it has been rejected or nak'ed, and
2245  * caused action scn.  (The return value is used to make the state
2246  * transition decision in the state automaton.)
2247  */
2248 static int
2249 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2250 {
2251         STDDCL;
2252         u_char *buf, *r, *p;
2253         int origlen, rlen;
2254         u_long nmagic;
2255         u_short authproto;
2256
2257         len -= 4;
2258         origlen = len;
2259         buf = r = kmalloc (len, M_TEMP, M_INTWAIT);
2260
2261         if (debug)
2262                 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
2263                     SPP_ARGS(ifp));
2264
2265         /* pass 1: check for things that need to be rejected */
2266         p = (void*) (h+1);
2267         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2268                 /* Sanity check option length */
2269                 if (p[1] > len) {
2270                         /* Malicious option - drop immediately.
2271                          * XXX Maybe we should just RXJ it?
2272                          */
2273                          log(-1, "%s: received malicious LCP option 0x%02x, "
2274                              "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname,
2275                              p[0], p[1], len);
2276                         goto drop;
2277                 }
2278                 if (debug)
2279                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2280                 switch (*p) {
2281                 case LCP_OPT_MAGIC:
2282                         /* Magic number. */
2283                         if (len >= 6 && p[1] == 6)
2284                                 continue;
2285                         if (debug)
2286                                 log(-1, "[invalid] ");
2287                         break;
2288                 case LCP_OPT_ASYNC_MAP:
2289                         /* Async control character map. */
2290                         if (len >= 6 && p[1] == 6)
2291                                 continue;
2292                         if (debug)
2293                                 log(-1, "[invalid] ");
2294                         break;
2295                 case LCP_OPT_MRU:
2296                         /* Maximum receive unit. */
2297                         if (len >= 4 && p[1] == 4)
2298                                 continue;
2299                         if (debug)
2300                                 log(-1, "[invalid] ");
2301                         break;
2302                 case LCP_OPT_AUTH_PROTO:
2303                         if (len < 4) {
2304                                 if (debug)
2305                                         log(-1, "[invalid] ");
2306                                 break;
2307                         }
2308                         authproto = (p[2] << 8) + p[3];
2309                         if (authproto == PPP_CHAP && p[1] != 5) {
2310                                 if (debug)
2311                                         log(-1, "[invalid chap len] ");
2312                                 break;
2313                         }
2314                         if (sp->myauth.proto == 0) {
2315                                 /* we are not configured to do auth */
2316                                 if (debug)
2317                                         log(-1, "[not configured] ");
2318                                 break;
2319                         }
2320                         /*
2321                          * Remote want us to authenticate, remember this,
2322                          * so we stay in PHASE_AUTHENTICATE after LCP got
2323                          * up.
2324                          */
2325                         sp->pp_flags |= PP_NEEDAUTH;
2326                         continue;
2327                 default:
2328                         /* Others not supported. */
2329                         if (debug)
2330                                 log(-1, "[rej] ");
2331                         break;
2332                 }
2333                 /* Add the option to rejected list. */
2334                 bcopy (p, r, p[1]);
2335                 r += p[1];
2336                 rlen += p[1];
2337         }
2338         if (rlen) {
2339                 if (debug)
2340                         log(-1, " send conf-rej\n");
2341                 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2342                 return 0;
2343         } else if (debug)
2344                 log(-1, "\n");
2345
2346         /*
2347          * pass 2: check for option values that are unacceptable and
2348          * thus require to be nak'ed.
2349          */
2350         if (debug)
2351                 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2352                     SPP_ARGS(ifp));
2353
2354         p = (void*) (h+1);
2355         len = origlen;
2356         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2357                 if (debug)
2358                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2359                 switch (*p) {
2360                 case LCP_OPT_MAGIC:
2361                         /* Magic number -- extract. */
2362                         nmagic = (u_long)p[2] << 24 |
2363                                 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2364                         if (nmagic != sp->lcp.magic) {
2365                                 sp->pp_loopcnt = 0;
2366                                 if (debug)
2367                                         log(-1, "0x%lx ", nmagic);
2368                                 continue;
2369                         }
2370                         if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
2371                                 log(-1, "[glitch] ");
2372                         ++sp->pp_loopcnt;
2373                         /*
2374                          * We negate our magic here, and NAK it.  If
2375                          * we see it later in an NAK packet, we
2376                          * suggest a new one.
2377                          */
2378                         nmagic = ~sp->lcp.magic;
2379                         /* Gonna NAK it. */
2380                         p[2] = nmagic >> 24;
2381                         p[3] = nmagic >> 16;
2382                         p[4] = nmagic >> 8;
2383                         p[5] = nmagic;
2384                         break;
2385
2386                 case LCP_OPT_ASYNC_MAP:
2387                         /*
2388                          * Async control character map -- just ignore it.
2389                          *
2390                          * Quote from RFC 1662, chapter 6:
2391                          * To enable this functionality, synchronous PPP
2392                          * implementations MUST always respond to the
2393                          * Async-Control-Character-Map Configuration
2394                          * Option with the LCP Configure-Ack.  However,
2395                          * acceptance of the Configuration Option does
2396                          * not imply that the synchronous implementation
2397                          * will do any ACCM mapping.  Instead, all such
2398                          * octet mapping will be performed by the
2399                          * asynchronous-to-synchronous converter.
2400                          */
2401                         continue;
2402
2403                 case LCP_OPT_MRU:
2404                         /*
2405                          * Maximum receive unit.  Always agreeable,
2406                          * but ignored by now.
2407                          */
2408                         sp->lcp.their_mru = p[2] * 256 + p[3];
2409                         if (debug)
2410                                 log(-1, "%lu ", sp->lcp.their_mru);
2411                         continue;
2412
2413                 case LCP_OPT_AUTH_PROTO:
2414                         authproto = (p[2] << 8) + p[3];
2415                         if (sp->myauth.proto != authproto) {
2416                                 /* not agreed, nak */
2417                                 if (debug)
2418                                         log(-1, "[mine %s != his %s] ",
2419                                                sppp_proto_name(sp->hisauth.proto),
2420                                                sppp_proto_name(authproto));
2421                                 p[2] = sp->myauth.proto >> 8;
2422                                 p[3] = sp->myauth.proto;
2423                                 break;
2424                         }
2425                         if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2426                                 if (debug)
2427                                         log(-1, "[chap not MD5] ");
2428                                 p[4] = CHAP_MD5;
2429                                 break;
2430                         }
2431                         continue;
2432                 }
2433                 /* Add the option to nak'ed list. */
2434                 bcopy (p, r, p[1]);
2435                 r += p[1];
2436                 rlen += p[1];
2437         }
2438         if (rlen) {
2439                 /*
2440                  * Local and remote magics equal -- loopback?
2441                  */
2442                 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2443                         if (sp->pp_loopcnt == MAXALIVECNT*5)
2444                                 kprintf (SPP_FMT "loopback\n",
2445                                         SPP_ARGS(ifp));
2446                         if (ifp->if_flags & IFF_UP) {
2447                                 if_down(ifp);
2448                                 IF_DRAIN(&sp->pp_cpq);
2449                                 /* XXX ? */
2450                                 lcp.Down(sp);
2451                                 lcp.Up(sp);
2452                         }
2453                 } else if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2454                         if (debug)
2455                                 log(-1, " max_failure (%d) exceeded, "
2456                                        "send conf-rej\n",
2457                                        sp->lcp.max_failure);
2458                         sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2459                 } else {
2460                         if (debug)
2461                                 log(-1, " send conf-nak\n");
2462                         sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2463                 }
2464         } else {
2465                 if (debug)
2466                         log(-1, " send conf-ack\n");
2467                 sp->fail_counter[IDX_LCP] = 0;
2468                 sp->pp_loopcnt = 0;
2469                 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2470                               h->ident, origlen, h+1);
2471         }
2472
2473         kfree (buf, M_TEMP);
2474         return (rlen == 0);
2475
2476 drop:
2477         kfree(buf, M_TEMP);
2478         return (-1);
2479 }
2480
2481 /*
2482  * Analyze the LCP Configure-Reject option list, and adjust our
2483  * negotiation.
2484  */
2485 static void
2486 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2487 {
2488         STDDCL;
2489         u_char *buf, *p;
2490
2491         len -= 4;
2492         buf = kmalloc (len, M_TEMP, M_INTWAIT);
2493
2494         if (debug)
2495                 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2496                     SPP_ARGS(ifp));
2497
2498         p = (void*) (h+1);
2499         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2500                 /* Sanity check option length */
2501                 if (p[1] > len) {
2502                         /*
2503                          * Malicious option - drop immediately.
2504                          * XXX Maybe we should just RXJ it?
2505                          */
2506                         log(-1, "%s: received malicious LCP option, "
2507                             "dropping.\n", ifp->if_xname);
2508                         goto drop;
2509                 }
2510                 if (debug)
2511                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2512                 switch (*p) {
2513                 case LCP_OPT_MAGIC:
2514                         /* Magic number -- can't use it, use 0 */
2515                         sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2516                         sp->lcp.magic = 0;
2517                         break;
2518                 case LCP_OPT_MRU:
2519                         /*
2520                          * Should not be rejected anyway, since we only
2521                          * negotiate a MRU if explicitly requested by
2522                          * peer.
2523                          */
2524                         sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2525                         break;
2526                 case LCP_OPT_AUTH_PROTO:
2527                         /*
2528                          * Peer doesn't want to authenticate himself,
2529                          * deny unless this is a dialout call, and
2530                          * AUTHFLAG_NOCALLOUT is set.
2531                          */
2532                         if ((sp->pp_flags & PP_CALLIN) == 0 &&
2533                             (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2534                                 if (debug)
2535                                         log(-1, "[don't insist on auth "
2536                                                "for callout]");
2537                                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2538                                 break;
2539                         }
2540                         if (debug)
2541                                 log(-1, "[access denied]\n");
2542                         lcp.Close(sp);
2543                         break;
2544                 }
2545         }
2546         if (debug)
2547                 log(-1, "\n");
2548 drop:
2549         kfree (buf, M_TEMP);
2550         return;
2551 }
2552
2553 /*
2554  * Analyze the LCP Configure-NAK option list, and adjust our
2555  * negotiation.
2556  */
2557 static void
2558 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2559 {
2560         STDDCL;
2561         u_char *buf, *p;
2562         u_long magic;
2563
2564         len -= 4;
2565         buf = kmalloc (len, M_TEMP, M_INTWAIT);
2566
2567         if (debug)
2568                 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2569                     SPP_ARGS(ifp));
2570
2571         p = (void*) (h+1);
2572         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2573                 /* Sanity check option length */
2574                 if (p[1] > len) {
2575                         /*
2576                          * Malicious option - drop immediately.
2577                          * XXX Maybe we should just RXJ it?
2578                          */
2579                         log(-1, "%s: received malicious LCP option, "
2580                             "dropping.\n", ifp->if_xname);
2581                         goto drop;
2582                 }
2583                 if (debug)
2584                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2585                 switch (*p) {
2586                 case LCP_OPT_MAGIC:
2587                         /* Magic number -- renegotiate */
2588                         if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2589                             len >= 6 && p[1] == 6) {
2590                                 magic = (u_long)p[2] << 24 |
2591                                         (u_long)p[3] << 16 | p[4] << 8 | p[5];
2592                                 /*
2593                                  * If the remote magic is our negated one,
2594                                  * this looks like a loopback problem.
2595                                  * Suggest a new magic to make sure.
2596                                  */
2597                                 if (magic == ~sp->lcp.magic) {
2598                                         if (debug)
2599                                                 log(-1, "magic glitch ");
2600 #if defined(__DragonFly__)
2601                                         sp->lcp.magic = krandom();
2602 #else
2603                                         sp->lcp.magic = time.tv_sec + time.tv_usec;
2604 #endif
2605                                 } else {
2606                                         sp->lcp.magic = magic;
2607                                         if (debug)
2608                                                 log(-1, "%lu ", magic);
2609                                 }
2610                         }
2611                         break;
2612                 case LCP_OPT_MRU:
2613                         /*
2614                          * Peer wants to advise us to negotiate an MRU.
2615                          * Agree on it if it's reasonable, or use
2616                          * default otherwise.
2617                          */
2618                         if (len >= 4 && p[1] == 4) {
2619                                 u_int mru = p[2] * 256 + p[3];
2620                                 if (debug)
2621                                         log(-1, "%d ", mru);
2622                                 if (mru < PP_MTU || mru > PP_MAX_MRU)
2623                                         mru = PP_MTU;
2624                                 sp->lcp.mru = mru;
2625                                 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2626                         }
2627                         break;
2628                 case LCP_OPT_AUTH_PROTO:
2629                         /*
2630                          * Peer doesn't like our authentication method,
2631                          * deny.
2632                          */
2633                         if (debug)
2634                                 log(-1, "[access denied]\n");
2635                         lcp.Close(sp);
2636                         break;
2637                 }
2638         }
2639         if (debug)
2640                 log(-1, "\n");
2641 drop:
2642         kfree (buf, M_TEMP);
2643         return;
2644 }
2645
2646 static void
2647 sppp_lcp_tlu(struct sppp *sp)
2648 {
2649         STDDCL;
2650         int i;
2651         u_long mask;
2652
2653         /* XXX ? */
2654         if (! (ifp->if_flags & IFF_UP) &&
2655             (ifp->if_flags & IFF_RUNNING)) {
2656                 /* Coming out of loopback mode. */
2657                 if_up(ifp);
2658                 kprintf (SPP_FMT "up\n", SPP_ARGS(ifp));
2659         }
2660
2661         for (i = 0; i < IDX_COUNT; i++)
2662                 if ((cps[i])->flags & CP_QUAL)
2663                         (cps[i])->Open(sp);
2664
2665         if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2666             (sp->pp_flags & PP_NEEDAUTH) != 0)
2667                 sp->pp_phase = PHASE_AUTHENTICATE;
2668         else
2669                 sp->pp_phase = PHASE_NETWORK;
2670
2671         if (debug)
2672                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2673                     sppp_phase_name(sp->pp_phase));
2674
2675         /*
2676          * Open all authentication protocols.  This is even required
2677          * if we already proceeded to network phase, since it might be
2678          * that remote wants us to authenticate, so we might have to
2679          * send a PAP request.  Undesired authentication protocols
2680          * don't do anything when they get an Open event.
2681          */
2682         for (i = 0; i < IDX_COUNT; i++)
2683                 if ((cps[i])->flags & CP_AUTH)
2684                         (cps[i])->Open(sp);
2685
2686         if (sp->pp_phase == PHASE_NETWORK) {
2687                 /* Notify all NCPs. */
2688                 for (i = 0; i < IDX_COUNT; i++)
2689                         if (((cps[i])->flags & CP_NCP) &&
2690                             /*
2691                              * XXX
2692                              * Hack to administratively disable IPv6 if
2693                              * not desired.  Perhaps we should have another
2694                              * flag for this, but right now, we can make
2695                              * all struct cp's read/only.
2696                              */
2697                             (cps[i] != &ipv6cp ||
2698                              (sp->confflags & CONF_ENABLE_IPV6)))
2699                                 (cps[i])->Open(sp);
2700         }
2701
2702         /* Send Up events to all started protos. */
2703         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2704                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2705                         (cps[i])->Up(sp);
2706
2707         /* notify low-level driver of state change */
2708         if (sp->pp_chg)
2709                 sp->pp_chg(sp, (int)sp->pp_phase);
2710
2711         if (sp->pp_phase == PHASE_NETWORK)
2712                 /* if no NCP is starting, close down */
2713                 sppp_lcp_check_and_close(sp);
2714 }
2715
2716 static void
2717 sppp_lcp_tld(struct sppp *sp)
2718 {
2719         STDDCL;
2720         int i;
2721         u_long mask;
2722
2723         sp->pp_phase = PHASE_TERMINATE;
2724
2725         if (debug)
2726                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2727                     sppp_phase_name(sp->pp_phase));
2728
2729         /*
2730          * Take upper layers down.  We send the Down event first and
2731          * the Close second to prevent the upper layers from sending
2732          * ``a flurry of terminate-request packets'', as the RFC
2733          * describes it.
2734          */
2735         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2736                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2737                         (cps[i])->Down(sp);
2738                         (cps[i])->Close(sp);
2739                 }
2740 }
2741
2742 static void
2743 sppp_lcp_tls(struct sppp *sp)
2744 {
2745         STDDCL;
2746
2747         sp->pp_phase = PHASE_ESTABLISH;
2748
2749         if (debug)
2750                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2751                     sppp_phase_name(sp->pp_phase));
2752
2753         /* Notify lower layer if desired. */
2754         if (sp->pp_tls)
2755                 (sp->pp_tls)(sp);
2756         else
2757                 (sp->pp_up)(sp);
2758 }
2759
2760 static void
2761 sppp_lcp_tlf(struct sppp *sp)
2762 {
2763         STDDCL;
2764
2765         sp->pp_phase = PHASE_DEAD;
2766         if (debug)
2767                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2768                     sppp_phase_name(sp->pp_phase));
2769
2770         /* Notify lower layer if desired. */
2771         if (sp->pp_tlf)
2772                 (sp->pp_tlf)(sp);
2773         else
2774                 (sp->pp_down)(sp);
2775 }
2776
2777 static void
2778 sppp_lcp_scr(struct sppp *sp)
2779 {
2780         char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2781         int i = 0;
2782         u_short authproto;
2783
2784         if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2785                 if (! sp->lcp.magic)
2786 #if defined(__DragonFly__)
2787                         sp->lcp.magic = krandom();
2788 #else
2789                         sp->lcp.magic = time.tv_sec + time.tv_usec;
2790 #endif
2791                 opt[i++] = LCP_OPT_MAGIC;
2792                 opt[i++] = 6;
2793                 opt[i++] = sp->lcp.magic >> 24;
2794                 opt[i++] = sp->lcp.magic >> 16;
2795                 opt[i++] = sp->lcp.magic >> 8;
2796                 opt[i++] = sp->lcp.magic;
2797         }
2798
2799         if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2800                 opt[i++] = LCP_OPT_MRU;
2801                 opt[i++] = 4;
2802                 opt[i++] = sp->lcp.mru >> 8;
2803                 opt[i++] = sp->lcp.mru;
2804         }
2805
2806         if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2807                 authproto = sp->hisauth.proto;
2808                 opt[i++] = LCP_OPT_AUTH_PROTO;
2809                 opt[i++] = authproto == PPP_CHAP? 5: 4;
2810                 opt[i++] = authproto >> 8;
2811                 opt[i++] = authproto;
2812                 if (authproto == PPP_CHAP)
2813                         opt[i++] = CHAP_MD5;
2814         }
2815
2816         sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2817         sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2818 }
2819
2820 /*
2821  * Check the open NCPs, return true if at least one NCP is open.
2822  */
2823 static int
2824 sppp_ncp_check(struct sppp *sp)
2825 {
2826         int i, mask;
2827
2828         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2829                 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2830                         return 1;
2831         return 0;
2832 }
2833
2834 /*
2835  * Re-check the open NCPs and see if we should terminate the link.
2836  * Called by the NCPs during their tlf action handling.
2837  */
2838 static void
2839 sppp_lcp_check_and_close(struct sppp *sp)
2840 {
2841
2842         if (sp->pp_phase < PHASE_NETWORK)
2843                 /* don't bother, we are already going down */
2844                 return;
2845
2846         if (sppp_ncp_check(sp))
2847                 return;
2848
2849         lcp.Close(sp);
2850 }
2851
2852 /*
2853  *--------------------------------------------------------------------------*
2854  *                                                                          *
2855  *                        The IPCP implementation.                          *
2856  *                                                                          *
2857  *--------------------------------------------------------------------------*
2858  */
2859
2860 static void
2861 sppp_ipcp_init(struct sppp *sp)
2862 {
2863         sp->ipcp.opts = 0;
2864         sp->ipcp.flags = 0;
2865         sp->state[IDX_IPCP] = STATE_INITIAL;
2866         sp->fail_counter[IDX_IPCP] = 0;
2867         sp->pp_seq[IDX_IPCP] = 0;
2868         sp->pp_rseq[IDX_IPCP] = 0;
2869 #if defined(__DragonFly__)
2870         callout_init(&sp->timeout[IDX_IPCP]);
2871 #endif
2872 }
2873
2874 static void
2875 sppp_ipcp_up(struct sppp *sp)
2876 {
2877         sppp_up_event(&ipcp, sp);
2878 }
2879
2880 static void
2881 sppp_ipcp_down(struct sppp *sp)
2882 {
2883         sppp_down_event(&ipcp, sp);
2884 }
2885
2886 static void
2887 sppp_ipcp_open(struct sppp *sp)
2888 {
2889         STDDCL;
2890         u_long myaddr, hisaddr;
2891
2892         sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
2893                             IPCP_MYADDR_DYN | IPCP_VJ);
2894         sp->ipcp.opts = 0;
2895
2896         sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2897         /*
2898          * If we don't have his address, this probably means our
2899          * interface doesn't want to talk IP at all.  (This could
2900          * be the case if somebody wants to speak only IPX, for
2901          * example.)  Don't open IPCP in this case.
2902          */
2903         if (hisaddr == 0L) {
2904                 /* XXX this message should go away */
2905                 if (debug)
2906                         log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2907                             SPP_ARGS(ifp));
2908                 return;
2909         }
2910         if (myaddr == 0L) {
2911                 /*
2912                  * I don't have an assigned address, so i need to
2913                  * negotiate my address.
2914                  */
2915                 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2916                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2917         } else
2918                 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2919         if (sp->confflags & CONF_ENABLE_VJ) {
2920                 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
2921                 sp->ipcp.max_state = MAX_STATES - 1;
2922                 sp->ipcp.compress_cid = 1;
2923         }
2924         sppp_open_event(&ipcp, sp);
2925 }
2926
2927 static void
2928 sppp_ipcp_close(struct sppp *sp)
2929 {
2930         sppp_close_event(&ipcp, sp);
2931         if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2932                 /*
2933                  * My address was dynamic, clear it again.
2934                  */
2935                 sppp_set_ip_addr(sp, 0L);
2936 }
2937
2938 static void
2939 sppp_ipcp_TO(void *cookie)
2940 {
2941         sppp_to_event(&ipcp, (struct sppp *)cookie);
2942 }
2943
2944 /*
2945  * Analyze a configure request.  Return true if it was agreeable, and
2946  * caused action sca, false if it has been rejected or nak'ed, and
2947  * caused action scn.  (The return value is used to make the state
2948  * transition decision in the state automaton.)
2949  */
2950 static int
2951 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2952 {
2953         u_char *buf, *r, *p;
2954         struct ifnet *ifp = &sp->pp_if;
2955         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2956         u_long hisaddr, desiredaddr;
2957         int gotmyaddr = 0;
2958         int desiredcomp;
2959
2960         len -= 4;
2961         origlen = len;
2962         /*
2963          * Make sure to allocate a buf that can at least hold a
2964          * conf-nak with an `address' option.  We might need it below.
2965          */
2966         buf = r = kmalloc ((len < 6? 6: len), M_TEMP, M_INTWAIT);
2967
2968         /* pass 1: see if we can recognize them */
2969         if (debug)
2970                 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2971                     SPP_ARGS(ifp));
2972         p = (void*) (h+1);
2973         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2974                 /* Sanity check option length */
2975                 if (p[1] > len) {
2976                         /* XXX should we just RXJ? */
2977                         log(-1, "%s: malicious IPCP option received, dropping\n",
2978                             ifp->if_xname);
2979                         goto drop;
2980                 }
2981                 if (debug)
2982                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
2983                 switch (*p) {
2984                 case IPCP_OPT_COMPRESSION:
2985                         if (!(sp->confflags & CONF_ENABLE_VJ)) {
2986                                 /* VJ compression administratively disabled */
2987                                 if (debug)
2988                                         log(-1, "[locally disabled] ");
2989                                 break;
2990                         }
2991                         /*
2992                          * In theory, we should only conf-rej an
2993                          * option that is shorter than RFC 1618
2994                          * requires (i.e. < 4), and should conf-nak
2995                          * anything else that is not VJ.  However,
2996                          * since our algorithm always uses the
2997                          * original option to NAK it with new values,
2998                          * things would become more complicated.  In
2999                          * pratice, the only commonly implemented IP
3000                          * compression option is VJ anyway, so the
3001                          * difference is negligible.
3002                          */
3003                         if (len >= 6 && p[1] == 6) {
3004                                 /*
3005                                  * correctly formed compression option
3006                                  * that could be VJ compression
3007                                  */
3008                                 continue;
3009                         }
3010                         if (debug)
3011                                 log(-1, "optlen %d [invalid/unsupported] ",
3012                                     p[1]);
3013                         break;
3014                 case IPCP_OPT_ADDRESS:
3015                         if (len >= 6 && p[1] == 6) {
3016                                 /* correctly formed address option */
3017                                 continue;
3018                         }
3019                         if (debug)
3020                                 log(-1, "[invalid] ");
3021                         break;
3022                 default:
3023                         /* Others not supported. */
3024                         if (debug)
3025                                 log(-1, "[rej] ");
3026                         break;
3027                 }
3028                 /* Add the option to rejected list. */
3029                 bcopy (p, r, p[1]);
3030                 r += p[1];
3031                 rlen += p[1];
3032         }
3033         if (rlen) {
3034                 if (debug)
3035                         log(-1, " send conf-rej\n");
3036                 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
3037                 return 0;
3038         } else if (debug)
3039                 log(-1, "\n");
3040
3041         /* pass 2: parse option values */
3042         sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
3043         if (debug)
3044                 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
3045                        SPP_ARGS(ifp));
3046         p = (void*) (h+1);
3047         len = origlen;
3048         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3049                 if (debug)
3050                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3051                 switch (*p) {
3052                 case IPCP_OPT_COMPRESSION:
3053                         desiredcomp = p[2] << 8 | p[3];
3054                         /* We only support VJ */
3055                         if (desiredcomp == IPCP_COMP_VJ) {
3056                                 if (debug)
3057                                         log(-1, "VJ [ack] ");
3058                                 sp->ipcp.flags |= IPCP_VJ;
3059                                 sl_compress_init(sp->pp_comp, p[4]);
3060                                 sp->ipcp.max_state = p[4];
3061                                 sp->ipcp.compress_cid = p[5];
3062                                 continue;
3063                         }
3064                         if (debug)
3065                                 log(-1, "compproto %#04x [not supported] ",
3066                                     desiredcomp);
3067                         p[2] = IPCP_COMP_VJ >> 8;
3068                         p[3] = IPCP_COMP_VJ;
3069                         p[4] = sp->ipcp.max_state;
3070                         p[5] = sp->ipcp.compress_cid;
3071                         break;
3072                 case IPCP_OPT_ADDRESS:
3073                         /* This is the address he wants in his end */
3074                         desiredaddr = p[2] << 24 | p[3] << 16 |
3075                                 p[4] << 8 | p[5];
3076                         if (desiredaddr == hisaddr ||
3077                             (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
3078                                 /*
3079                                  * Peer's address is same as our value,
3080                                  * or we have set it to 0.0.0.* to
3081                                  * indicate that we do not really care,
3082                                  * this is agreeable.  Gonna conf-ack
3083                                  * it.
3084                                  */
3085                                 if (debug)
3086                                         log(-1, "%s [ack] ",
3087                                                 sppp_dotted_quad(hisaddr));
3088                                 /* record that we've seen it already */
3089                                 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
3090                                 continue;
3091                         }
3092                         /*
3093                          * The address wasn't agreeable.  This is either
3094                          * he sent us 0.0.0.0, asking to assign him an
3095                          * address, or he send us another address not
3096                          * matching our value.  Either case, we gonna
3097                          * conf-nak it with our value.
3098                          * XXX: we should "rej" if hisaddr == 0
3099                          */
3100                         if (debug) {
3101                                 if (desiredaddr == 0)
3102                                         log(-1, "[addr requested] ");
3103                                 else
3104                                         log(-1, "%s [not agreed] ",
3105                                                 sppp_dotted_quad(desiredaddr));
3106
3107                         }
3108                         p[2] = hisaddr >> 24;
3109                         p[3] = hisaddr >> 16;
3110                         p[4] = hisaddr >> 8;
3111                         p[5] = hisaddr;
3112                         break;
3113                 }
3114                 /* Add the option to nak'ed list. */
3115                 bcopy (p, r, p[1]);
3116                 r += p[1];
3117                 rlen += p[1];
3118         }
3119
3120         /*
3121          * If we are about to conf-ack the request, but haven't seen
3122          * his address so far, gonna conf-nak it instead, with the
3123          * `address' option present and our idea of his address being
3124          * filled in there, to request negotiation of both addresses.
3125          *
3126          * XXX This can result in an endless req - nak loop if peer
3127          * doesn't want to send us his address.  Q: What should we do
3128          * about it?  XXX  A: implement the max-failure counter.
3129          */
3130         if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
3131                 buf[0] = IPCP_OPT_ADDRESS;
3132                 buf[1] = 6;
3133                 buf[2] = hisaddr >> 24;
3134                 buf[3] = hisaddr >> 16;
3135                 buf[4] = hisaddr >> 8;
3136                 buf[5] = hisaddr;
3137                 rlen = 6;
3138                 if (debug)
3139                         log(-1, "still need hisaddr ");
3140         }
3141
3142         if (rlen) {
3143                 if (debug)
3144                         log(-1, " send conf-nak\n");
3145                 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
3146         } else {
3147                 if (debug)
3148                         log(-1, " send conf-ack\n");
3149                 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
3150                               h->ident, origlen, h+1);
3151         }
3152
3153         kfree (buf, M_TEMP);
3154         return (rlen == 0);
3155
3156 drop:
3157         kfree(buf, M_TEMP);
3158         return (-1);
3159 }
3160
3161 /*
3162  * Analyze the IPCP Configure-Reject option list, and adjust our
3163  * negotiation.
3164  */
3165 static void
3166 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3167 {
3168         u_char *buf, *p;
3169         struct ifnet *ifp = &sp->pp_if;
3170         int debug = ifp->if_flags & IFF_DEBUG;
3171
3172         len -= 4;
3173         buf = kmalloc (len, M_TEMP, M_INTWAIT);
3174
3175         if (debug)
3176                 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
3177                     SPP_ARGS(ifp));
3178
3179         p = (void*) (h+1);
3180         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3181                 /* Sanity check option length */
3182                 if (p[1] > len) {
3183                         /* XXX should we just RXJ? */
3184                         log(-1, "%s: malicious IPCP option received, dropping\n",
3185                             ifp->if_xname);
3186                         goto drop;
3187                 }
3188                 if (debug)
3189                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3190                 switch (*p) {
3191                 case IPCP_OPT_COMPRESSION:
3192                         sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
3193                         break;
3194                 case IPCP_OPT_ADDRESS:
3195                         /*
3196                          * Peer doesn't grok address option.  This is
3197                          * bad.  XXX  Should we better give up here?
3198                          * XXX We could try old "addresses" option...
3199                          */
3200                         sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3201                         break;
3202                 }
3203         }
3204         if (debug)
3205                 log(-1, "\n");
3206 drop:
3207         kfree (buf, M_TEMP);
3208         return;
3209 }
3210
3211 /*
3212  * Analyze the IPCP Configure-NAK option list, and adjust our
3213  * negotiation.
3214  */
3215 static void
3216 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3217 {
3218         u_char *buf, *p;
3219         struct ifnet *ifp = &sp->pp_if;
3220         int debug = ifp->if_flags & IFF_DEBUG;
3221         int desiredcomp;
3222         u_long wantaddr;
3223
3224         len -= 4;
3225         buf = kmalloc (len, M_TEMP, M_INTWAIT);
3226
3227         if (debug)
3228                 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
3229                     SPP_ARGS(ifp));
3230
3231         p = (void*) (h+1);
3232         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3233                 /* Sanity check option length */
3234                 if (p[1] > len) {
3235                         /* XXX should we just RXJ? */
3236                         log(-1, "%s: malicious IPCP option received, dropping\n",
3237                             ifp->if_xname);
3238                         return;
3239                 }
3240                 if (debug)
3241                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3242                 switch (*p) {
3243                 case IPCP_OPT_COMPRESSION:
3244                         if (len >= 6 && p[1] == 6) {
3245                                 desiredcomp = p[2] << 8 | p[3];
3246                                 if (debug)
3247                                         log(-1, "[wantcomp %#04x] ",
3248                                                 desiredcomp);
3249                                 if (desiredcomp == IPCP_COMP_VJ) {
3250                                         sl_compress_init(sp->pp_comp, p[4]);
3251                                         sp->ipcp.max_state = p[4];
3252                                         sp->ipcp.compress_cid = p[5];
3253                                         if (debug)
3254                                                 log(-1, "[agree] ");
3255                                 } else
3256                                         sp->ipcp.opts &=
3257                                                 ~(1 << IPCP_OPT_COMPRESSION);
3258                         }
3259                         break;
3260                 case IPCP_OPT_ADDRESS:
3261                         /*
3262                          * Peer doesn't like our local IP address.  See
3263                          * if we can do something for him.  We'll drop
3264                          * him our address then.
3265                          */
3266                         if (len >= 6 && p[1] == 6) {
3267                                 wantaddr = p[2] << 24 | p[3] << 16 |
3268                                         p[4] << 8 | p[5];
3269                                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3270                                 if (debug)
3271                                         log(-1, "[wantaddr %s] ",
3272                                                sppp_dotted_quad(wantaddr));
3273                                 /*
3274                                  * When doing dynamic address assignment,
3275                                  * we accept his offer.  Otherwise, we
3276                                  * ignore it and thus continue to negotiate
3277                                  * our already existing value.
3278                                  * XXX: Bogus, if he said no once, he'll
3279                                  * just say no again, might as well die.
3280                                  */
3281                                 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3282                                         sppp_set_ip_addr(sp, wantaddr);
3283                                         if (debug)
3284                                                 log(-1, "[agree] ");
3285                                         sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3286                                 }
3287                         }
3288                         break;
3289                 }
3290         }
3291         if (debug)
3292                 log(-1, "\n");
3293         kfree (buf, M_TEMP);
3294         return;
3295 }
3296
3297 static void
3298 sppp_ipcp_tlu(struct sppp *sp)
3299 {
3300         /* we are up - notify isdn daemon */
3301         if (sp->pp_con)
3302                 sp->pp_con(sp);
3303 }
3304
3305 static void
3306 sppp_ipcp_tld(struct sppp *sp)
3307 {
3308 }
3309
3310 static void
3311 sppp_ipcp_tls(struct sppp *sp)
3312 {
3313         /* indicate to LCP that it must stay alive */
3314         sp->lcp.protos |= (1 << IDX_IPCP);
3315 }
3316
3317 static void
3318 sppp_ipcp_tlf(struct sppp *sp)
3319 {
3320         /* we no longer need LCP */
3321         sp->lcp.protos &= ~(1 << IDX_IPCP);
3322         sppp_lcp_check_and_close(sp);
3323 }
3324
3325 static void
3326 sppp_ipcp_scr(struct sppp *sp)
3327 {
3328         char opt[6 /* compression */ + 6 /* address */];
3329         u_long ouraddr;
3330         int i = 0;
3331
3332         if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3333                 opt[i++] = IPCP_OPT_COMPRESSION;
3334                 opt[i++] = 6;
3335                 opt[i++] = IPCP_COMP_VJ >> 8;
3336                 opt[i++] = IPCP_COMP_VJ;
3337                 opt[i++] = sp->ipcp.max_state;
3338                 opt[i++] = sp->ipcp.compress_cid;
3339         }
3340         if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3341                 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3342                 opt[i++] = IPCP_OPT_ADDRESS;
3343                 opt[i++] = 6;
3344                 opt[i++] = ouraddr >> 24;
3345                 opt[i++] = ouraddr >> 16;
3346                 opt[i++] = ouraddr >> 8;
3347                 opt[i++] = ouraddr;
3348         }
3349
3350         sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3351         sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3352 }
3353
3354 /*
3355  *--------------------------------------------------------------------------*
3356  *                                                                          *
3357  *                      The IPv6CP implementation.                          *
3358  *                                                                          *
3359  *--------------------------------------------------------------------------*
3360  */
3361
3362 #ifdef INET6
3363 static void
3364 sppp_ipv6cp_init(struct sppp *sp)
3365 {
3366         sp->ipv6cp.opts = 0;
3367         sp->ipv6cp.flags = 0;
3368         sp->state[IDX_IPV6CP] = STATE_INITIAL;
3369         sp->fail_counter[IDX_IPV6CP] = 0;
3370         sp->pp_seq[IDX_IPV6CP] = 0;
3371         sp->pp_rseq[IDX_IPV6CP] = 0;
3372 #if defined(__NetBSD__)
3373         callout_init(&sp->ch[IDX_IPV6CP]);
3374 #endif
3375 #if defined(__DragonFly__)
3376         callout_init(&sp->timeout[IDX_IPV6CP]);
3377 #endif
3378 }
3379
3380 static void
3381 sppp_ipv6cp_up(struct sppp *sp)
3382 {
3383         sppp_up_event(&ipv6cp, sp);
3384 }
3385
3386 static void
3387 sppp_ipv6cp_down(struct sppp *sp)
3388 {
3389         sppp_down_event(&ipv6cp, sp);
3390 }
3391
3392 static void
3393 sppp_ipv6cp_open(struct sppp *sp)
3394 {
3395         STDDCL;
3396         struct in6_addr myaddr, hisaddr;
3397
3398 #ifdef IPV6CP_MYIFID_DYN
3399         sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3400 #else
3401         sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3402 #endif
3403
3404         sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3405         /*
3406          * If we don't have our address, this probably means our
3407          * interface doesn't want to talk IPv6 at all.  (This could
3408          * be the case if somebody wants to speak only IPX, for
3409          * example.)  Don't open IPv6CP in this case.
3410          */
3411         if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3412                 /* XXX this message should go away */
3413                 if (debug)
3414                         log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
3415                             SPP_ARGS(ifp));
3416                 return;
3417         }
3418
3419         sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3420         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3421         sppp_open_event(&ipv6cp, sp);
3422 }
3423
3424 static void
3425 sppp_ipv6cp_close(struct sppp *sp)
3426 {
3427         sppp_close_event(&ipv6cp, sp);
3428 }
3429
3430 static void
3431 sppp_ipv6cp_TO(void *cookie)
3432 {
3433         sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3434 }
3435
3436 /*
3437  * Analyze a configure request.  Return true if it was agreeable, and
3438  * caused action sca, false if it has been rejected or nak'ed, and
3439  * caused action scn.  (The return value is used to make the state
3440  * transition decision in the state automaton.)
3441  */
3442 static int
3443 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3444 {
3445         u_char *buf, *r, *p;
3446         struct ifnet *ifp = &sp->pp_if;
3447         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3448         struct in6_addr myaddr, desiredaddr, suggestaddr;
3449         int ifidcount;
3450         int type;
3451         int collision, nohisaddr;
3452
3453         len -= 4;
3454         origlen = len;
3455         /*
3456          * Make sure to allocate a buf that can at least hold a
3457          * conf-nak with an `address' option.  We might need it below.
3458          */
3459         buf = r = kmalloc ((len < 6? 6: len), M_TEMP, M_INTWAIT);
3460
3461         /* pass 1: see if we can recognize them */
3462         if (debug)
3463                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
3464                     SPP_ARGS(ifp));
3465         p = (void*) (h+1);
3466         ifidcount = 0;
3467         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3468                 /* Sanity check option length */
3469                 if (p[1] > len) {
3470                         /* XXX just RXJ? */
3471                         log(-1, "%s: received malicious IPCPv6 option, "
3472                             "dropping\n", ifp->if_xname);
3473                         goto drop;
3474                 }
3475                 if (debug)
3476                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3477                 switch (*p) {
3478                 case IPV6CP_OPT_IFID:
3479                         if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3480                                 /* correctly formed address option */
3481                                 ifidcount++;
3482                                 continue;
3483                         }
3484                         if (debug)
3485                                 log(-1, " [invalid]");
3486                         break;
3487 #ifdef notyet
3488                 case IPV6CP_OPT_COMPRESSION:
3489                         if (len >= 4 && p[1] >= 4) {
3490                                 /* correctly formed compress option */
3491                                 continue;
3492                         }
3493                         if (debug)
3494                                 log(-1, " [invalid]");
3495                         break;
3496 #endif
3497                 default:
3498                         /* Others not supported. */
3499                         if (debug)
3500                                 log(-1, " [rej]");
3501                         break;
3502                 }
3503                 /* Add the option to rejected list. */
3504                 bcopy (p, r, p[1]);
3505                 r += p[1];
3506                 rlen += p[1];
3507         }
3508         if (rlen) {
3509                 if (debug)
3510                         log(-1, " send conf-rej\n");
3511                 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3512                 goto end;
3513         } else if (debug)
3514                 log(-1, "\n");
3515
3516         /* pass 2: parse option values */
3517         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3518         if (debug)
3519                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
3520                     SPP_ARGS(ifp));
3521         p = (void*) (h+1);
3522         len = origlen;
3523         type = CONF_ACK;
3524         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3525                 if (debug)
3526                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3527                 switch (*p) {
3528 #ifdef notyet
3529                 case IPV6CP_OPT_COMPRESSION:
3530                         continue;
3531 #endif
3532                 case IPV6CP_OPT_IFID:
3533                         bzero(&desiredaddr, sizeof(desiredaddr));
3534                         bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3535                         collision = (bcmp(&desiredaddr.s6_addr[8],
3536                                           &myaddr.s6_addr[8], 8) == 0);
3537                         nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3538
3539                         desiredaddr.s6_addr16[0] = htons(0xfe80);
3540                         desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3541
3542                         if (!collision && !nohisaddr) {
3543                                 /* no collision, hisaddr known - Conf-Ack */
3544                                 type = CONF_ACK;
3545
3546                                 if (debug) {
3547                                         log(-1, " %s [%s]",
3548                                                ip6_sprintf(&desiredaddr),
3549                                                sppp_cp_type_name(type));
3550                                 }
3551                                 continue;
3552                         }
3553
3554                         bzero(&suggestaddr, sizeof(&suggestaddr));
3555                         if (collision && nohisaddr) {
3556                                 /* collision, hisaddr unknown - Conf-Rej */
3557                                 type = CONF_REJ;
3558                                 bzero(&p[2], 8);
3559                         } else {
3560                                 /*
3561                                  * - no collision, hisaddr unknown, or
3562                                  * - collision, hisaddr known
3563                                  * Conf-Nak, suggest hisaddr
3564                                  */
3565                                 type = CONF_NAK;
3566                                 sppp_suggest_ip6_addr(sp, &suggestaddr);
3567                                 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3568                         }
3569                         if (debug)
3570                                 log(-1, " %s [%s]", ip6_sprintf(&desiredaddr),
3571                                        sppp_cp_type_name(type));
3572                         break;
3573                 }
3574                 /* Add the option to nak'ed list. */
3575                 bcopy (p, r, p[1]);
3576                 r += p[1];
3577                 rlen += p[1];
3578         }
3579
3580         if (rlen == 0 && type == CONF_ACK) {
3581                 if (debug)
3582                         log(-1, " send %s\n", sppp_cp_type_name(type));
3583                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
3584         } else {
3585 #ifdef DIAGNOSTIC
3586                 if (type == CONF_ACK)
3587                         panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3588 #endif
3589
3590                 if (debug) {
3591                         log(-1, " send %s suggest %s\n",
3592                                sppp_cp_type_name(type), ip6_sprintf(&suggestaddr));
3593                 }
3594                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3595         }
3596
3597  end:
3598         kfree (buf, M_TEMP);
3599         return (rlen == 0);
3600
3601 drop:
3602         kfree(buf, M_TEMP);
3603         return (-1);
3604 }
3605
3606 /*
3607  * Analyze the IPv6CP Configure-Reject option list, and adjust our
3608  * negotiation.
3609  */
3610 static void
3611 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3612 {
3613         u_char *buf, *p;
3614         struct ifnet *ifp = &sp->pp_if;
3615         int debug = ifp->if_flags & IFF_DEBUG;
3616
3617         len -= 4;
3618         buf = kmalloc (len, M_TEMP, M_INTWAIT);
3619
3620         if (debug)
3621                 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
3622                     SPP_ARGS(ifp));
3623
3624         p = (void*) (h+1);
3625         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3626                 if (p[1] > len) {
3627                         /* XXX just RXJ? */
3628                         log(-1, "%s: received malicious IPCPv6 option, "
3629                             "dropping\n", ifp->if_xname);
3630                         goto drop;
3631                 }
3632                 if (debug)
3633                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3634                 switch (*p) {
3635                 case IPV6CP_OPT_IFID:
3636                         /*
3637                          * Peer doesn't grok address option.  This is
3638                          * bad.  XXX  Should we better give up here?
3639                          */
3640                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3641                         break;
3642 #ifdef notyet
3643                 case IPV6CP_OPT_COMPRESS:
3644                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3645                         break;
3646 #endif
3647                 }
3648         }
3649         if (debug)
3650                 log(-1, "\n");
3651 drop:
3652         kfree (buf, M_TEMP);
3653         return;
3654 }
3655
3656 /*
3657  * Analyze the IPv6CP Configure-NAK option list, and adjust our
3658  * negotiation.
3659  */
3660 static void
3661 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3662 {
3663         u_char *buf, *p;
3664         struct ifnet *ifp = &sp->pp_if;
3665         int debug = ifp->if_flags & IFF_DEBUG;
3666         struct in6_addr suggestaddr;
3667
3668         len -= 4;
3669         buf = kmalloc (len, M_TEMP, M_INTWAIT);
3670
3671         if (debug)
3672                 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:",
3673                     SPP_ARGS(ifp));
3674
3675         p = (void*) (h+1);
3676         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3677                 if (p[1] > len) {
3678                         /* XXX just RXJ? */
3679                         log(-1, "%s: received malicious IPCPv6 option, "
3680                             "dropping\n", ifp->if_xname);
3681                         goto drop;
3682                 }
3683                 if (debug)
3684                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3685                 switch (*p) {
3686                 case IPV6CP_OPT_IFID:
3687                         /*
3688                          * Peer doesn't like our local ifid.  See
3689                          * if we can do something for him.  We'll drop
3690                          * him our address then.
3691                          */
3692                         if (len < 10 || p[1] != 10)
3693                                 break;
3694                         bzero(&suggestaddr, sizeof(suggestaddr));
3695                         suggestaddr.s6_addr16[0] = htons(0xfe80);
3696                         suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3697                         bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3698
3699                         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3700                         if (debug)
3701                                 log(-1, " [suggestaddr %s]",
3702                                        ip6_sprintf(&suggestaddr));
3703 #ifdef IPV6CP_MYIFID_DYN
3704                         /*
3705                          * When doing dynamic address assignment,
3706                          * we accept his offer.
3707                          */
3708                         if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3709                                 struct in6_addr lastsuggest;
3710                                 /*
3711                                  * If <suggested myaddr from peer> equals to
3712                                  * <hisaddr we have suggested last time>,
3713                                  * we have a collision.  generate new random
3714                                  * ifid.
3715                                  */
3716                                 sppp_suggest_ip6_addr(&lastsuggest);
3717                                 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
3718                                                        lastsuggest)) {
3719                                         if (debug)
3720                                                 log(-1, " [random]");
3721                                         sppp_gen_ip6_addr(sp, &suggestaddr);
3722                                 }
3723                                 sppp_set_ip6_addr(sp, &suggestaddr, 0);
3724                                 if (debug)
3725                                         log(-1, " [agree]");
3726                                 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3727                         }
3728 #else
3729                         /*
3730                          * Since we do not do dynamic address assignment,
3731                          * we ignore it and thus continue to negotiate
3732                          * our already existing value.  This can possibly
3733                          * go into infinite request-reject loop.
3734                          *
3735                          * This is not likely because we normally use
3736                          * ifid based on MAC-address.
3737                          * If you have no ethernet card on the node, too bad.
3738                          * XXX should we use fail_counter?
3739                          */
3740 #endif
3741                         break;
3742 #ifdef notyet
3743                 case IPV6CP_OPT_COMPRESS:
3744                         /*
3745                          * Peer wants different compression parameters.
3746                          */
3747                         break;
3748 #endif
3749                 }
3750         }
3751         if (debug)
3752                 log(-1, "\n");
3753 drop:
3754         kfree (buf, M_TEMP);
3755         return;
3756 }
3757 static void
3758 sppp_ipv6cp_tlu(struct sppp *sp)
3759 {
3760         /* we are up - notify isdn daemon */
3761         if (sp->pp_con)
3762                 sp->pp_con(sp);
3763 }
3764
3765 static void
3766 sppp_ipv6cp_tld(struct sppp *sp)
3767 {
3768 }
3769
3770 static void
3771 sppp_ipv6cp_tls(struct sppp *sp)
3772 {
3773         /* indicate to LCP that it must stay alive */
3774         sp->lcp.protos |= (1 << IDX_IPV6CP);
3775 }
3776
3777 static void
3778 sppp_ipv6cp_tlf(struct sppp *sp)
3779 {
3780
3781 #if 0   /* need #if 0 to close IPv6CP properly */
3782         /* we no longer need LCP */
3783         sp->lcp.protos &= ~(1 << IDX_IPV6CP);
3784         sppp_lcp_check_and_close(sp);
3785 #endif
3786 }
3787
3788 static void
3789 sppp_ipv6cp_scr(struct sppp *sp)
3790 {
3791         char opt[10 /* ifid */ + 4 /* compression, minimum */];
3792         struct in6_addr ouraddr;
3793         int i = 0;
3794
3795         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
3796                 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
3797                 opt[i++] = IPV6CP_OPT_IFID;
3798                 opt[i++] = 10;
3799                 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
3800                 i += 8;
3801         }
3802
3803 #ifdef notyet
3804         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
3805                 opt[i++] = IPV6CP_OPT_COMPRESSION;
3806                 opt[i++] = 4;
3807                 opt[i++] = 0;   /* TBD */
3808                 opt[i++] = 0;   /* TBD */
3809                 /* variable length data may follow */
3810         }
3811 #endif
3812
3813         sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
3814         sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt);
3815 }
3816 #else /*INET6*/
3817 static void
3818 sppp_ipv6cp_init(struct sppp *sp)
3819 {
3820 }
3821
3822 static void
3823 sppp_ipv6cp_up(struct sppp *sp)
3824 {
3825 }
3826
3827 static void
3828 sppp_ipv6cp_down(struct sppp *sp)
3829 {
3830 }
3831
3832
3833 static void
3834 sppp_ipv6cp_open(struct sppp *sp)
3835 {
3836 }
3837
3838 static void
3839 sppp_ipv6cp_close(struct sppp *sp)
3840 {
3841 }
3842
3843 static void
3844 sppp_ipv6cp_TO(void *sp)
3845 {
3846 }
3847
3848 static int
3849 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3850 {
3851         return 0;
3852 }
3853
3854 static void
3855 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3856 {
3857 }
3858
3859 static void
3860 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3861 {
3862 }
3863
3864 static void
3865 sppp_ipv6cp_tlu(struct sppp *sp)
3866 {
3867 }
3868
3869 static void
3870 sppp_ipv6cp_tld(struct sppp *sp)
3871 {
3872 }
3873
3874 static void
3875 sppp_ipv6cp_tls(struct sppp *sp)
3876 {
3877 }
3878
3879 static void
3880 sppp_ipv6cp_tlf(struct sppp *sp)
3881 {
3882 }
3883
3884 static void
3885 sppp_ipv6cp_scr(struct sppp *sp)
3886 {
3887 }
3888 #endif /*INET6*/
3889
3890 /*
3891  *--------------------------------------------------------------------------*
3892  *                                                                          *
3893  *                        The CHAP implementation.                          *
3894  *                                                                          *
3895  *--------------------------------------------------------------------------*
3896  */
3897
3898 /*
3899  * The authentication protocols don't employ a full-fledged state machine as
3900  * the control protocols do, since they do have Open and Close events, but
3901  * not Up and Down, nor are they explicitly terminated.  Also, use of the
3902  * authentication protocols may be different in both directions (this makes
3903  * sense, think of a machine that never accepts incoming calls but only
3904  * calls out, it doesn't require the called party to authenticate itself).
3905  *
3906  * Our state machine for the local authentication protocol (we are requesting
3907  * the peer to authenticate) looks like:
3908  *
3909  *                                                  RCA-
3910  *            +--------------------------------------------+
3911  *            V                                     scn,tld|
3912  *        +--------+                           Close   +---------+ RCA+
3913  *        |        |<----------------------------------|         |------+
3914  *   +--->| Closed |                            TO*    | Opened  | sca  |
3915  *   |    |        |-----+                     +-------|         |<-----+
3916  *   |    +--------+ irc |                     |       +---------+
3917  *   |      ^            |                     |           ^
3918  *   |      |            |                     |           |
3919  *   |      |            |                     |           |
3920  *   |   TO-|            |                     |           |
3921  *   |      |tld  TO+    V                     |           |
3922  *   |      |   +------->+                     |           |
3923  *   |      |   |        |                     |           |
3924  *   |    +--------+     V                     |           |
3925  *   |    |        |<----+<--------------------+           |
3926  *   |    | Req-   | scr                                   |
3927  *   |    | Sent   |                                       |
3928  *   |    |        |                                       |
3929  *   |    +--------+                                       |
3930  *   | RCA- |   | RCA+                                     |
3931  *   +------+   +------------------------------------------+
3932  *   scn,tld      sca,irc,ict,tlu
3933  *
3934  *
3935  *   with:
3936  *
3937  *      Open:   LCP reached authentication phase
3938  *      Close:  LCP reached terminate phase
3939  *
3940  *      RCA+:   received reply (pap-req, chap-response), acceptable
3941  *      RCN:    received reply (pap-req, chap-response), not acceptable
3942  *      TO+:    timeout with restart counter >= 0
3943  *      TO-:    timeout with restart counter < 0
3944  *      TO*:    reschedule timeout for CHAP
3945  *
3946  *      scr:    send request packet (none for PAP, chap-challenge)
3947  *      sca:    send ack packet (pap-ack, chap-success)
3948  *      scn:    send nak packet (pap-nak, chap-failure)
3949  *      ict:    initialize re-challenge timer (CHAP only)
3950  *
3951  *      tlu:    this-layer-up, LCP reaches network phase
3952  *      tld:    this-layer-down, LCP enters terminate phase
3953  *
3954  * Note that in CHAP mode, after sending a new challenge, while the state
3955  * automaton falls back into Req-Sent state, it doesn't signal a tld
3956  * event to LCP, so LCP remains in network phase.  Only after not getting
3957  * any response (or after getting an unacceptable response), CHAP closes,
3958  * causing LCP to enter terminate phase.
3959  *
3960  * With PAP, there is no initial request that can be sent.  The peer is
3961  * expected to send one based on the successful negotiation of PAP as
3962  * the authentication protocol during the LCP option negotiation.
3963  *
3964  * Incoming authentication protocol requests (remote requests
3965  * authentication, we are peer) don't employ a state machine at all,
3966  * they are simply answered.  Some peers [Ascend P50 firmware rev
3967  * 4.50] react allergically when sending IPCP requests while they are
3968  * still in authentication phase (thereby violating the standard that
3969  * demands that these NCP packets are to be discarded), so we keep
3970  * track of the peer demanding us to authenticate, and only proceed to
3971  * phase network once we've seen a positive acknowledge for the
3972  * authentication.
3973  */
3974
3975 /*
3976  * Handle incoming CHAP packets.
3977  */
3978 void
3979 sppp_chap_input(struct sppp *sp, struct mbuf *m)
3980 {
3981         STDDCL;
3982         struct lcp_header *h;
3983         int len;
3984         u_char *value, *name, digest[AUTHKEYLEN], dsize;
3985         int value_len, name_len;
3986         MD5_CTX ctx;
3987
3988         len = m->m_pkthdr.len;
3989         if (len < 4) {
3990                 if (debug)
3991                         log(LOG_DEBUG,
3992                             SPP_FMT "chap invalid packet length: %d bytes\n",
3993                             SPP_ARGS(ifp), len);
3994                 return;
3995         }
3996         h = mtod (m, struct lcp_header*);
3997         if (len > ntohs (h->len))
3998                 len = ntohs (h->len);
3999
4000         switch (h->type) {
4001         /* challenge, failure and success are his authproto */
4002         case CHAP_CHALLENGE:
4003                 value = 1 + (u_char*)(h+1);
4004                 value_len = value[-1];
4005                 name = value + value_len;
4006                 name_len = len - value_len - 5;
4007                 if (name_len < 0) {
4008                         if (debug) {
4009                                 log(LOG_DEBUG,
4010                                     SPP_FMT "chap corrupted challenge "
4011                                     "<%s id=0x%x len=%d",
4012                                     SPP_ARGS(ifp),
4013                                     sppp_auth_type_name(PPP_CHAP, h->type),
4014                                     h->ident, ntohs(h->len));
4015                                 sppp_print_bytes((u_char*) (h+1), len-4);
4016                                 log(-1, ">\n");
4017                         }
4018                         break;
4019                 }
4020
4021                 if (debug) {
4022                         log(LOG_DEBUG,
4023                             SPP_FMT "chap input <%s id=0x%x len=%d name=",
4024                             SPP_ARGS(ifp),
4025                             sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
4026                             ntohs(h->len));
4027                         sppp_print_string((char*) name, name_len);
4028                         log(-1, " value-size=%d value=", value_len);
4029                         sppp_print_bytes(value, value_len);
4030                         log(-1, ">\n");
4031                 }
4032
4033                 /* Compute reply value. */
4034                 MD5Init(&ctx);
4035                 MD5Update(&ctx, &h->ident, 1);
4036                 MD5Update(&ctx, sp->myauth.secret,
4037                           sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
4038                 MD5Update(&ctx, value, value_len);
4039                 MD5Final(digest, &ctx);
4040                 dsize = sizeof digest;
4041
4042                 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
4043                                sizeof dsize, (const char *)&dsize,
4044                                sizeof digest, digest,
4045                                (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4046                                sp->myauth.name,
4047                                0);
4048                 break;
4049
4050         case CHAP_SUCCESS:
4051                 if (debug) {
4052                         log(LOG_DEBUG, SPP_FMT "chap success",
4053                             SPP_ARGS(ifp));
4054                         if (len > 4) {
4055                                 log(-1, ": ");
4056                                 sppp_print_string((char*)(h + 1), len - 4);
4057                         }
4058                         log(-1, "\n");
4059                 }
4060
4061                 crit_enter();
4062
4063                 sp->pp_flags &= ~PP_NEEDAUTH;
4064                 if (sp->myauth.proto == PPP_CHAP &&
4065                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4066                     (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
4067                         /*
4068                          * We are authenticator for CHAP but didn't
4069                          * complete yet.  Leave it to tlu to proceed
4070                          * to network phase.
4071                          */
4072                         crit_exit();
4073                         break;
4074                 }
4075                 crit_exit();
4076                 sppp_phase_network(sp);
4077                 break;
4078
4079         case CHAP_FAILURE:
4080                 if (debug) {
4081                         log(LOG_INFO, SPP_FMT "chap failure",
4082                             SPP_ARGS(ifp));
4083                         if (len > 4) {
4084                                 log(-1, ": ");
4085                                 sppp_print_string((char*)(h + 1), len - 4);
4086                         }
4087                         log(-1, "\n");
4088                 } else
4089                         log(LOG_INFO, SPP_FMT "chap failure\n",
4090                             SPP_ARGS(ifp));
4091                 /* await LCP shutdown by authenticator */
4092                 break;
4093
4094         /* response is my authproto */
4095         case CHAP_RESPONSE:
4096                 value = 1 + (u_char*)(h+1);
4097                 value_len = value[-1];
4098                 name = value + value_len;
4099                 name_len = len - value_len - 5;
4100                 if (name_len < 0) {
4101                         if (debug) {
4102                                 log(LOG_DEBUG,
4103                                     SPP_FMT "chap corrupted response "
4104                                     "<%s id=0x%x len=%d",
4105                                     SPP_ARGS(ifp),
4106                                     sppp_auth_type_name(PPP_CHAP, h->type),
4107                                     h->ident, ntohs(h->len));
4108                                 sppp_print_bytes((u_char*)(h+1), len-4);
4109                                 log(-1, ">\n");
4110                         }
4111                         break;
4112                 }
4113                 if (h->ident != sp->confid[IDX_CHAP]) {
4114                         if (debug)
4115                                 log(LOG_DEBUG,
4116                                     SPP_FMT "chap dropping response for old ID "
4117                                     "(got %d, expected %d)\n",
4118                                     SPP_ARGS(ifp),
4119                                     h->ident, sp->confid[IDX_CHAP]);
4120                         break;
4121                 }
4122                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
4123                     || bcmp(name, sp->hisauth.name, name_len) != 0) {
4124                         log(LOG_INFO, SPP_FMT "chap response, his name ",
4125                             SPP_ARGS(ifp));
4126                         sppp_print_string(name, name_len);
4127                         log(-1, " != expected ");
4128                         sppp_print_string(sp->hisauth.name,
4129                                           sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
4130                         log(-1, "\n");
4131                 }
4132                 if (debug) {
4133                         log(LOG_DEBUG, SPP_FMT "chap input(%s) "
4134                             "<%s id=0x%x len=%d name=",
4135                             SPP_ARGS(ifp),
4136                             sppp_state_name(sp->state[IDX_CHAP]),
4137                             sppp_auth_type_name(PPP_CHAP, h->type),
4138                             h->ident, ntohs (h->len));
4139                         sppp_print_string((char*)name, name_len);
4140                         log(-1, " value-size=%d value=", value_len);
4141                         sppp_print_bytes(value, value_len);
4142                         log(-1, ">\n");
4143                 }
4144                 if (value_len != AUTHKEYLEN) {
4145                         if (debug)
4146                                 log(LOG_DEBUG,
4147                                     SPP_FMT "chap bad hash value length: "
4148                                     "%d bytes, should be %d\n",
4149                                     SPP_ARGS(ifp), value_len,
4150                                     AUTHKEYLEN);
4151                         break;
4152                 }
4153
4154                 MD5Init(&ctx);
4155                 MD5Update(&ctx, &h->ident, 1);
4156                 MD5Update(&ctx, sp->hisauth.secret,
4157                           sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
4158                 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
4159                 MD5Final(digest, &ctx);
4160
4161 #define FAILMSG "Failed..."
4162 #define SUCCMSG "Welcome!"
4163
4164                 if (value_len != sizeof digest ||
4165                     bcmp(digest, value, value_len) != 0) {
4166                         /* action scn, tld */
4167                         sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
4168                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4169                                        0);
4170                         chap.tld(sp);
4171                         break;
4172                 }
4173                 /* action sca, perhaps tlu */
4174                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
4175                     sp->state[IDX_CHAP] == STATE_OPENED)
4176                         sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
4177                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4178                                        0);
4179                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
4180                         sppp_cp_change_state(&chap, sp, STATE_OPENED);
4181                         chap.tlu(sp);
4182                 }
4183                 break;
4184
4185         default:
4186                 /* Unknown CHAP packet type -- ignore. */
4187                 if (debug) {
4188                         log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
4189                             "<0x%x id=0x%xh len=%d",
4190                             SPP_ARGS(ifp),
4191                             sppp_state_name(sp->state[IDX_CHAP]),
4192                             h->type, h->ident, ntohs(h->len));
4193                         sppp_print_bytes((u_char*)(h+1), len-4);
4194                         log(-1, ">\n");
4195                 }
4196                 break;
4197
4198         }
4199 }
4200
4201 static void
4202 sppp_chap_init(struct sppp *sp)
4203 {
4204         /* Chap doesn't have STATE_INITIAL at all. */
4205         sp->state[IDX_CHAP] = STATE_CLOSED;
4206         sp->fail_counter[IDX_CHAP] = 0;
4207         sp->pp_seq[IDX_CHAP] = 0;
4208         sp->pp_rseq[IDX_CHAP] = 0;
4209 #if defined(__DragonFly__)
4210         callout_init(&sp->timeout[IDX_CHAP]);
4211 #endif
4212 }
4213
4214 static void
4215 sppp_chap_open(struct sppp *sp)
4216 {
4217         if (sp->myauth.proto == PPP_CHAP &&
4218             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4219                 /* we are authenticator for CHAP, start it */
4220                 chap.scr(sp);
4221                 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4222                 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4223         }
4224         /* nothing to be done if we are peer, await a challenge */
4225 }
4226
4227 static void
4228 sppp_chap_close(struct sppp *sp)
4229 {
4230         if (sp->state[IDX_CHAP] != STATE_CLOSED)
4231                 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4232 }
4233
4234 static void
4235 sppp_chap_TO(void *cookie)
4236 {
4237         struct sppp *sp = (struct sppp *)cookie;
4238         STDDCL;
4239
4240         crit_enter();
4241
4242         if (debug)
4243                 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
4244                     SPP_ARGS(ifp),
4245                     sppp_state_name(sp->state[IDX_CHAP]),
4246                     sp->rst_counter[IDX_CHAP]);
4247
4248         if (--sp->rst_counter[IDX_CHAP] < 0)
4249                 /* TO- event */
4250                 switch (sp->state[IDX_CHAP]) {
4251                 case STATE_REQ_SENT:
4252                         chap.tld(sp);
4253                         sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4254                         break;
4255                 }
4256         else
4257                 /* TO+ (or TO*) event */
4258                 switch (sp->state[IDX_CHAP]) {
4259                 case STATE_OPENED:
4260                         /* TO* event */
4261                         sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4262                         /* fall through */
4263                 case STATE_REQ_SENT:
4264                         chap.scr(sp);
4265                         /* sppp_cp_change_state() will restart the timer */
4266                         sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4267                         break;
4268                 }
4269
4270         crit_exit();
4271 }
4272
4273 static void
4274 sppp_chap_tlu(struct sppp *sp)
4275 {
4276         STDDCL;
4277         int i;
4278
4279         i = 0;
4280         sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4281
4282         /*
4283          * Some broken CHAP implementations (Conware CoNet, firmware
4284          * 4.0.?) don't want to re-authenticate their CHAP once the
4285          * initial challenge-response exchange has taken place.
4286          * Provide for an option to avoid rechallenges.
4287          */
4288         if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
4289                 /*
4290                  * Compute the re-challenge timeout.  This will yield
4291                  * a number between 300 and 810 seconds.
4292                  */
4293                 i = 300 + ((unsigned)(krandom() & 0xff00) >> 7);
4294                 callout_reset(&sp->timeout[IDX_CHAP], i * hz, chap.TO, sp);
4295         }
4296
4297         if (debug) {
4298                 log(LOG_DEBUG,
4299                     SPP_FMT "chap %s, ",
4300                     SPP_ARGS(ifp),
4301                     sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
4302                 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
4303                         log(-1, "next re-challenge in %d seconds\n", i);
4304                 else
4305                         log(-1, "re-challenging suppressed\n");
4306         }
4307
4308         crit_enter();
4309
4310         /* indicate to LCP that we need to be closed down */
4311         sp->lcp.protos |= (1 << IDX_CHAP);
4312
4313         if (sp->pp_flags & PP_NEEDAUTH) {
4314                 /*
4315                  * Remote is authenticator, but his auth proto didn't
4316                  * complete yet.  Defer the transition to network
4317                  * phase.
4318                  */
4319                 crit_exit();
4320                 return;
4321         }
4322
4323         crit_exit();
4324
4325         /*
4326          * If we are already in phase network, we are done here.  This
4327          * is the case if this is a dummy tlu event after a re-challenge.
4328          */
4329         if (sp->pp_phase != PHASE_NETWORK)
4330                 sppp_phase_network(sp);
4331 }
4332
4333 static void
4334 sppp_chap_tld(struct sppp *sp)
4335 {
4336         STDDCL;
4337
4338         if (debug)
4339                 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
4340         callout_stop(&sp->timeout[IDX_CHAP]);
4341         sp->lcp.protos &= ~(1 << IDX_CHAP);
4342
4343         lcp.Close(sp);
4344 }
4345
4346 static void
4347 sppp_chap_scr(struct sppp *sp)
4348 {
4349         u_long *ch, seed;
4350         u_char clen;
4351
4352         /* Compute random challenge. */
4353         ch = (u_long *)sp->myauth.challenge;
4354 #if defined(__DragonFly__)
4355         read_random(&seed, sizeof seed);
4356 #else
4357         {
4358         struct timeval tv;
4359         microtime(&tv);
4360         seed = tv.tv_sec ^ tv.tv_usec;
4361         }
4362 #endif
4363         ch[0] = seed ^ krandom();
4364         ch[1] = seed ^ krandom();
4365         ch[2] = seed ^ krandom();
4366         ch[3] = seed ^ krandom();
4367         clen = AUTHKEYLEN;
4368
4369         sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP];
4370
4371         sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
4372                        sizeof clen, (const char *)&clen,
4373                        (size_t)AUTHKEYLEN, sp->myauth.challenge,
4374                        (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4375                        sp->myauth.name,
4376                        0);
4377 }
4378
4379 /*
4380  *--------------------------------------------------------------------------*
4381  *                                                                          *
4382  *                        The PAP implementation.                           *
4383  *                                                                          *
4384  *--------------------------------------------------------------------------*
4385  */
4386 /*
4387  * For PAP, we need to keep a little state also if we are the peer, not the
4388  * authenticator.  This is since we don't get a request to authenticate, but
4389  * have to repeatedly authenticate ourself until we got a response (or the
4390  * retry counter is expired).
4391  */
4392
4393 /*
4394  * Handle incoming PAP packets.  */
4395 static void
4396 sppp_pap_input(struct sppp *sp, struct mbuf *m)
4397 {
4398         STDDCL;
4399         struct lcp_header *h;
4400         int len;
4401         u_char *name, *passwd, mlen;
4402         int name_len, passwd_len;
4403
4404         /*
4405          * Malicious input might leave this uninitialized, so
4406          * init to an impossible value.
4407          */
4408         passwd_len = -1;
4409
4410         len = m->m_pkthdr.len;
4411         if (len < 5) {
4412                 if (debug)
4413                         log(LOG_DEBUG,
4414                             SPP_FMT "pap invalid packet length: %d bytes\n",
4415                             SPP_ARGS(ifp), len);
4416                 return;
4417         }
4418         h = mtod (m, struct lcp_header*);
4419         if (len > ntohs (h->len))
4420                 len = ntohs (h->len);
4421         switch (h->type) {
4422         /* PAP request is my authproto */
4423         case PAP_REQ:
4424                 name = 1 + (u_char*)(h+1);
4425                 name_len = name[-1];
4426                 passwd = name + name_len + 1;
4427                 if (name_len > len - 6 ||
4428                     (passwd_len = passwd[-1]) > len - 6 - name_len) {
4429                         if (debug) {
4430                                 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4431                                     "<%s id=0x%x len=%d",
4432                                     SPP_ARGS(ifp),
4433                                     sppp_auth_type_name(PPP_PAP, h->type),
4434                                     h->ident, ntohs(h->len));
4435                                 sppp_print_bytes((u_char*)(h+1), len-4);
4436                                 log(-1, ">\n");
4437                         }
4438                         break;
4439                 }
4440                 if (debug) {
4441                         log(LOG_DEBUG, SPP_FMT "pap input(%s) "
4442                             "<%s id=0x%x len=%d name=",
4443                             SPP_ARGS(ifp),
4444                             sppp_state_name(sp->state[IDX_PAP]),
4445                             sppp_auth_type_name(PPP_PAP, h->type),
4446                             h->ident, ntohs(h->len));
4447                         sppp_print_string((char*)name, name_len);
4448                         log(-1, " passwd=");
4449                         sppp_print_string((char*)passwd, passwd_len);
4450                         log(-1, ">\n");
4451                 }
4452                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) ||
4453                     passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) ||
4454                     bcmp(name, sp->hisauth.name, name_len) != 0 ||
4455                     bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
4456                         /* action scn, tld */
4457                         mlen = sizeof(FAILMSG) - 1;
4458                         sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
4459                                        sizeof mlen, (const char *)&mlen,
4460                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4461                                        0);
4462                         pap.tld(sp);
4463                         break;
4464                 }
4465                 /* action sca, perhaps tlu */
4466                 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
4467                     sp->state[IDX_PAP] == STATE_OPENED) {
4468                         mlen = sizeof(SUCCMSG) - 1;
4469                         sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
4470                                        sizeof mlen, (const char *)&mlen,
4471                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4472                                        0);
4473                 }
4474                 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
4475                         sppp_cp_change_state(&pap, sp, STATE_OPENED);
4476                         pap.tlu(sp);
4477                 }
4478                 break;
4479
4480         /* ack and nak are his authproto */
4481         case PAP_ACK:
4482                 callout_stop(&sp->pap_my_to);
4483                 if (debug) {
4484                         log(LOG_DEBUG, SPP_FMT "pap success",
4485                             SPP_ARGS(ifp));
4486                         name = 1 + (u_char *)(h + 1);
4487                         name_len = name[-1];
4488                         if (len > 5 && name_len < len+4) {
4489                                 log(-1, ": ");
4490                                 sppp_print_string(name, name_len);
4491                         }
4492                         log(-1, "\n");
4493                 }
4494
4495                 crit_enter();
4496
4497                 sp->pp_flags &= ~PP_NEEDAUTH;
4498                 if (sp->myauth.proto == PPP_PAP &&
4499                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4500                     (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
4501                         /*
4502                          * We are authenticator for PAP but didn't
4503                          * complete yet.  Leave it to tlu to proceed
4504                          * to network phase.
4505                          */
4506
4507                         crit_exit();
4508
4509                         break;
4510                 }
4511
4512                 crit_exit();
4513
4514                 sppp_phase_network(sp);
4515                 break;
4516
4517         case PAP_NAK:
4518                 callout_stop(&sp->pap_my_to);
4519                 if (debug) {
4520                         log(LOG_INFO, SPP_FMT "pap failure",
4521                             SPP_ARGS(ifp));
4522                         name = 1 + (u_char *)(h + 1);
4523                         name_len = name[-1];
4524                         if (len > 5 && name_len < len+4) {
4525                                 log(-1, ": ");
4526                                 sppp_print_string(name, name_len);
4527                         }
4528                         log(-1, "\n");
4529                 } else
4530                         log(LOG_INFO, SPP_FMT "pap failure\n",
4531                             SPP_ARGS(ifp));
4532                 /* await LCP shutdown by authenticator */
4533                 break;
4534
4535         default:
4536                 /* Unknown PAP packet type -- ignore. */
4537                 if (debug) {
4538                         log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4539                             "<0x%x id=0x%x len=%d",
4540                             SPP_ARGS(ifp),
4541                             h->type, h->ident, ntohs(h->len));
4542                         sppp_print_bytes((u_char*)(h+1), len-4);
4543                         log(-1, ">\n");
4544                 }
4545                 break;
4546
4547         }
4548 }
4549
4550 static void
4551 sppp_pap_init(struct sppp *sp)
4552 {
4553         /* PAP doesn't have STATE_INITIAL at all. */
4554         sp->state[IDX_PAP] = STATE_CLOSED;
4555         sp->fail_counter[IDX_PAP] = 0;
4556         sp->pp_seq[IDX_PAP] = 0;
4557         sp->pp_rseq[IDX_PAP] = 0;
4558 #if defined(__DragonFly__)
4559         callout_init(&sp->timeout[IDX_PAP]);
4560         callout_init(&sp->pap_my_to);
4561 #endif
4562 }
4563
4564 static void
4565 sppp_pap_open(struct sppp *sp)
4566 {
4567         if (sp->hisauth.proto == PPP_PAP &&
4568             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4569                 /* we are authenticator for PAP, start our timer */
4570                 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4571                 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4572         }
4573         if (sp->myauth.proto == PPP_PAP) {
4574                 /* we are peer, send a request, and start a timer */
4575                 pap.scr(sp);
4576                 callout_reset(&sp->pap_my_to, sp->lcp.timeout,
4577                                 sppp_pap_my_TO, sp);
4578         }
4579 }
4580
4581 static void
4582 sppp_pap_close(struct sppp *sp)
4583 {
4584         if (sp->state[IDX_PAP] != STATE_CLOSED)
4585                 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4586 }
4587
4588 /*
4589  * That's the timeout routine if we are authenticator.  Since the
4590  * authenticator is basically passive in PAP, we can't do much here.
4591  */
4592 static void
4593 sppp_pap_TO(void *cookie)
4594 {
4595         struct sppp *sp = (struct sppp *)cookie;
4596         STDDCL;
4597
4598         crit_enter();
4599
4600         if (debug)
4601                 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
4602                     SPP_ARGS(ifp),
4603                     sppp_state_name(sp->state[IDX_PAP]),
4604                     sp->rst_counter[IDX_PAP]);
4605
4606         if (--sp->rst_counter[IDX_PAP] < 0)
4607                 /* TO- event */
4608                 switch (sp->state[IDX_PAP]) {
4609                 case STATE_REQ_SENT:
4610                         pap.tld(sp);
4611                         sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4612                         break;
4613                 }
4614         else
4615                 /* TO+ event, not very much we could do */
4616                 switch (sp->state[IDX_PAP]) {
4617                 case STATE_REQ_SENT:
4618                         /* sppp_cp_change_state() will restart the timer */
4619                         sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4620                         break;
4621                 }
4622
4623         crit_exit();
4624 }
4625
4626 /*
4627  * That's the timeout handler if we are peer.  Since the peer is active,
4628  * we need to retransmit our PAP request since it is apparently lost.
4629  * XXX We should impose a max counter.
4630  */
4631 static void
4632 sppp_pap_my_TO(void *cookie)
4633 {
4634         struct sppp *sp = (struct sppp *)cookie;
4635         STDDCL;
4636
4637         if (debug)
4638                 log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
4639                     SPP_ARGS(ifp));
4640
4641         pap.scr(sp);
4642 }
4643
4644 static void
4645 sppp_pap_tlu(struct sppp *sp)
4646 {
4647         STDDCL;
4648
4649         sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4650
4651         if (debug)
4652                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
4653                     SPP_ARGS(ifp), pap.name);
4654
4655         crit_enter();
4656
4657         /* indicate to LCP that we need to be closed down */
4658         sp->lcp.protos |= (1 << IDX_PAP);
4659
4660         if (sp->pp_flags & PP_NEEDAUTH) {
4661                 /*
4662                  * Remote is authenticator, but his auth proto didn't
4663                  * complete yet.  Defer the transition to network
4664                  * phase.
4665                  */
4666                 crit_exit();
4667                 return;
4668         }
4669         crit_exit();
4670         sppp_phase_network(sp);
4671 }
4672
4673 static void
4674 sppp_pap_tld(struct sppp *sp)
4675 {
4676         STDDCL;
4677
4678         if (debug)
4679                 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
4680         callout_stop(&sp->timeout[IDX_PAP]);
4681         callout_stop(&sp->pap_my_to);
4682         sp->lcp.protos &= ~(1 << IDX_PAP);
4683
4684         lcp.Close(sp);
4685 }
4686
4687 static void
4688 sppp_pap_scr(struct sppp *sp)
4689 {
4690         u_char idlen, pwdlen;
4691
4692         sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP];
4693         pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
4694         idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
4695
4696         sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
4697                        sizeof idlen, (const char *)&idlen,
4698                        (size_t)idlen, sp->myauth.name,
4699                        sizeof pwdlen, (const char *)&pwdlen,
4700                        (size_t)pwdlen, sp->myauth.secret,
4701                        0);
4702 }
4703
4704 /*
4705  * Random miscellaneous functions.
4706  */
4707
4708 /*
4709  * Send a PAP or CHAP proto packet.
4710  *
4711  * Varadic function, each of the elements for the ellipsis is of type
4712  * ``size_t mlen, const u_char *msg''.  Processing will stop iff
4713  * mlen == 0.
4714  * NOTE: never declare variadic functions with types subject to type
4715  * promotion (i.e. u_char). This is asking for big trouble depending
4716  * on the architecture you are on...
4717  */
4718
4719 static void
4720 sppp_auth_send(const struct cp *cp, struct sppp *sp,
4721                unsigned int type, unsigned int id,
4722                ...)
4723 {
4724         STDDCL;
4725         struct ppp_header *h;
4726         struct lcp_header *lh;
4727         struct mbuf *m;
4728         u_char *p;
4729         int len;
4730         unsigned int mlen;
4731         const char *msg;
4732         __va_list ap;
4733
4734         MGETHDR (m, MB_DONTWAIT, MT_DATA);
4735         if (! m)
4736                 return;
4737         m->m_pkthdr.rcvif = 0;
4738
4739         h = mtod (m, struct ppp_header*);
4740         h->address = PPP_ALLSTATIONS;           /* broadcast address */
4741         h->control = PPP_UI;                    /* Unnumbered Info */
4742         h->protocol = htons(cp->proto);
4743
4744         lh = (struct lcp_header*)(h + 1);
4745         lh->type = type;
4746         lh->ident = id;
4747         p = (u_char*) (lh+1);
4748
4749         __va_start(ap, id);
4750         len = 0;
4751
4752         while ((mlen = (unsigned int)__va_arg(ap, size_t)) != 0) {
4753                 msg = __va_arg(ap, const char *);
4754                 len += mlen;
4755                 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
4756                         __va_end(ap);
4757                         m_freem(m);
4758                         return;
4759                 }
4760
4761                 bcopy(msg, p, mlen);
4762                 p += mlen;
4763         }
4764         __va_end(ap);
4765
4766         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
4767         lh->len = htons (LCP_HEADER_LEN + len);
4768
4769         if (debug) {
4770                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
4771                     SPP_ARGS(ifp), cp->name,
4772                     sppp_auth_type_name(cp->proto, lh->type),
4773                     lh->ident, ntohs(lh->len));
4774                 sppp_print_bytes((u_char*) (lh+1), len);
4775                 log(-1, ">\n");
4776         }
4777         if (IF_QFULL (&sp->pp_cpq)) {
4778                 IF_DROP (&sp->pp_fastq);
4779                 IF_DROP (&ifp->if_snd);
4780                 m_freem (m);
4781                 ++ifp->if_oerrors;
4782         } else
4783                 IF_ENQUEUE (&sp->pp_cpq, m);
4784         if (! (ifp->if_flags & IFF_OACTIVE))
4785                 (*ifp->if_start) (ifp);
4786         ifp->if_obytes += m->m_pkthdr.len + 3;
4787 }
4788
4789 /*
4790  * Send keepalive packets, every 10 seconds.
4791  */
4792 static void
4793 sppp_keepalive(void *dummy)
4794 {
4795         struct sppp *sp;
4796
4797         crit_enter();
4798
4799         for (sp=spppq; sp; sp=sp->pp_next) {
4800                 struct ifnet *ifp = &sp->pp_if;
4801
4802                 /* Keepalive mode disabled or channel down? */
4803                 if (! (sp->pp_flags & PP_KEEPALIVE) ||
4804                     ! (ifp->if_flags & IFF_RUNNING))
4805                         continue;
4806
4807                 /* No keepalive in PPP mode if LCP not opened yet. */
4808                 if (sp->pp_mode != IFF_CISCO &&
4809                     sp->pp_phase < PHASE_AUTHENTICATE)
4810                         continue;
4811
4812                 if (sp->pp_alivecnt == MAXALIVECNT) {
4813                         /* No keepalive packets got.  Stop the interface. */
4814                         kprintf (SPP_FMT "down\n", SPP_ARGS(ifp));
4815                         if_down (ifp);
4816                         IF_DRAIN(&sp->pp_cpq);
4817                         if (sp->pp_mode != IFF_CISCO) {
4818                                 /* XXX */
4819                                 /* Shut down the PPP link. */
4820                                 lcp.Down(sp);
4821                                 /* Initiate negotiation. XXX */
4822                                 lcp.Up(sp);
4823                         }
4824                 }
4825                 ifnet_serialize_all(ifp);
4826                 if (sp->pp_alivecnt <= MAXALIVECNT)
4827                         ++sp->pp_alivecnt;
4828                 if (sp->pp_mode == IFF_CISCO)
4829                         sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ,
4830                                  ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]);
4831                 else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
4832                         long nmagic = htonl (sp->lcp.magic);
4833                         sp->lcp.echoid = ++sp->pp_seq[IDX_LCP];
4834                         sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
4835                                 sp->lcp.echoid, 4, &nmagic);
4836                 }
4837                 ifnet_deserialize_all(ifp);
4838         }
4839         callout_reset(&keepalive_timeout, hz * 10, sppp_keepalive, NULL);
4840         crit_exit();
4841 }
4842
4843 /*
4844  * Get both IP addresses.
4845  */
4846 static void
4847 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
4848 {
4849         struct ifnet *ifp = &sp->pp_if;
4850         struct ifaddr_container *ifac;
4851         struct ifaddr *ifa;
4852         struct sockaddr_in *si, *sm;
4853         u_long ssrc, ddst;
4854
4855         sm = NULL;
4856         ssrc = ddst = 0L;
4857         /*
4858          * Pick the first AF_INET address from the list,
4859          * aliases don't make any sense on a p2p link anyway.
4860          */
4861         si = 0;
4862         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
4863                 ifa = ifac->ifa;
4864                 if (ifa->ifa_addr->sa_family == AF_INET) {
4865                         si = (struct sockaddr_in *)ifa->ifa_addr;
4866                         sm = (struct sockaddr_in *)ifa->ifa_netmask;
4867                         if (si)
4868                                 break;
4869                 }
4870         }
4871         if (ifac != NULL) {
4872                 if (si && si->sin_addr.s_addr) {
4873                         ssrc = si->sin_addr.s_addr;
4874                         if (srcmask)
4875                                 *srcmask = ntohl(sm->sin_addr.s_addr);
4876                 }
4877
4878                 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
4879                 if (si && si->sin_addr.s_addr)
4880                         ddst = si->sin_addr.s_addr;
4881         }
4882
4883         if (dst) *dst = ntohl(ddst);
4884         if (src) *src = ntohl(ssrc);
4885 }
4886
4887 /*
4888  * Set my IP address.  Must be called at splimp.
4889  */
4890 static void
4891 sppp_set_ip_addr(struct sppp *sp, u_long src)
4892 {
4893         STDDCL;
4894         struct ifaddr_container *ifac;
4895         struct ifaddr *ifa = NULL;
4896         struct sockaddr_in *si;
4897         struct in_ifaddr *ia;
4898
4899         /*
4900          * Pick the first AF_INET address from the list,
4901          * aliases don't make any sense on a p2p link anyway.
4902          */
4903         si = 0;
4904         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
4905                 ifa = ifac->ifa;
4906                 if (ifa->ifa_addr->sa_family == AF_INET) {
4907                         si = (struct sockaddr_in *)ifa->ifa_addr;
4908                         if (si)
4909                                 break;
4910                 }
4911         }
4912
4913         if (ifac != NULL && si != NULL) {
4914                 int error;
4915 #if __NetBSD_Version__ >= 103080000
4916                 struct sockaddr_in new_sin = *si;
4917
4918                 new_sin.sin_addr.s_addr = htonl(src);
4919                 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 1);
4920                 if(debug && error)
4921                 {
4922                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: in_ifinit "
4923                         " failed, error=%d\n", SPP_ARGS(ifp), error);
4924                 }
4925 #else
4926                 /* delete old route */
4927                 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST);
4928                 if(debug && error)
4929                 {
4930                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
4931                                 SPP_ARGS(ifp), error);
4932                 }
4933
4934                 ia = ifatoia(ifa);
4935                 in_iahash_remove(ia);
4936
4937                 /* set new address */
4938                 si->sin_addr.s_addr = htonl(src);
4939                 in_iahash_insert(ia);
4940
4941                 /* add new route */
4942                 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST);
4943                 if (debug && error)
4944                 {
4945                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
4946                                 SPP_ARGS(ifp), error);
4947                 }
4948 #endif
4949         }
4950 }
4951
4952 #ifdef INET6
4953 /*
4954  * Get both IPv6 addresses.
4955  */
4956 static void
4957 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst,
4958                    struct in6_addr *srcmask)
4959 {
4960         struct ifnet *ifp = &sp->pp_if;
4961         struct ifaddr_container *ifac;
4962         struct ifaddr *ifa;
4963         struct sockaddr_in6 *si, *sm;
4964         struct in6_addr ssrc, ddst;
4965
4966         sm = NULL;
4967         bzero(&ssrc, sizeof(ssrc));
4968         bzero(&ddst, sizeof(ddst));
4969         /*
4970          * Pick the first link-local AF_INET6 address from the list,
4971          * aliases don't make any sense on a p2p link anyway.
4972          */
4973         si = 0;
4974         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
4975                 ifa = ifac->ifa;
4976                 if (ifa->ifa_addr->sa_family == AF_INET6) {
4977                         si = (struct sockaddr_in6 *)ifa->ifa_addr;
4978                         sm = (struct sockaddr_in6 *)ifa->ifa_netmask;
4979                         if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr))
4980                                 break;
4981                 }
4982         }
4983         if (ifac != NULL) {
4984                 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) {
4985                         bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc));
4986                         if (srcmask) {
4987                                 bcopy(&sm->sin6_addr, srcmask,
4988                                       sizeof(*srcmask));
4989                         }
4990                 }
4991
4992                 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
4993                 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr))
4994                         bcopy(&si->sin6_addr, &ddst, sizeof(ddst));
4995         }
4996
4997         if (dst)
4998                 bcopy(&ddst, dst, sizeof(*dst));
4999         if (src)
5000                 bcopy(&ssrc, src, sizeof(*src));
5001 }
5002
5003 #ifdef IPV6CP_MYIFID_DYN
5004 /*
5005  * Generate random ifid.
5006  */
5007 static void
5008 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr)
5009 {
5010         /* TBD */
5011 }
5012
5013 /*
5014  * Set my IPv6 address.  Must be called at splimp.
5015  */
5016 static void
5017 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src)
5018 {
5019         STDDCL;
5020         struct ifaddr_container *ifac;
5021         struct ifaddr *ifa;
5022         struct sockaddr_in6 *sin6;
5023
5024         /*
5025          * Pick the first link-local AF_INET6 address from the list,
5026          * aliases don't make any sense on a p2p link anyway.
5027          */
5028
5029         sin6 = NULL;
5030         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
5031                 ifa = ifac->ifa;
5032                 if (ifa->ifa_addr->sa_family == AF_INET6) {
5033                         sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
5034                         if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
5035                                 break;
5036                 }
5037         }
5038
5039         if (ifac != NULL && sin6 != NULL) {
5040                 int error;
5041                 struct sockaddr_in6 new_sin6 = *sin6;
5042
5043                 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr));
5044                 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1);
5045                 if (debug && error) {
5046                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit "
5047                             " failed, error=%d\n", SPP_ARGS(ifp), error);
5048                 }
5049         }
5050 }
5051 #endif
5052
5053 /*
5054  * Suggest a candidate address to be used by peer.
5055  */
5056 static void
5057 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest)
5058 {
5059         struct in6_addr myaddr;
5060         struct timeval tv;
5061
5062         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
5063
5064         myaddr.s6_addr[8] &= ~0x02;     /* u bit to "local" */
5065         microtime(&tv);
5066         if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) {
5067                 myaddr.s6_addr[14] ^= 0xff;
5068                 myaddr.s6_addr[15] ^= 0xff;
5069         } else {
5070                 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff);
5071                 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff);
5072         }
5073         if (suggest)
5074                 bcopy(&myaddr, suggest, sizeof(myaddr));
5075 }
5076 #endif /*INET6*/
5077
5078 static int
5079 sppp_params(struct sppp *sp, u_long cmd, void *data)
5080 {
5081         u_long subcmd;
5082         struct ifreq *ifr = (struct ifreq *)data;
5083         struct spppreq *spr;
5084         int rv = 0;
5085
5086         spr = kmalloc(sizeof(struct spppreq), M_TEMP, M_INTWAIT);
5087
5088         /*
5089          * ifr->ifr_data is supposed to point to a struct spppreq.
5090          * Check the cmd word first before attempting to fetch all the
5091          * data.
5092          */
5093         if ((subcmd = fuword(ifr->ifr_data)) == -1) {
5094                 rv = EFAULT;
5095                 goto quit;
5096         }
5097
5098         if (copyin((caddr_t)ifr->ifr_data, spr, sizeof(struct spppreq)) != 0) {
5099                 rv = EFAULT;
5100                 goto quit;
5101         }
5102
5103         switch (subcmd) {
5104         case (int)SPPPIOGDEFS:
5105                 if (cmd != SIOCGIFGENERIC) {
5106                         rv = EINVAL;
5107                         break;
5108                 }
5109                 /*
5110                  * We copy over the entire current state, but clean
5111                  * out some of the stuff we don't wanna pass up.
5112                  * Remember, SIOCGIFGENERIC is unprotected, and can be
5113                  * called by any user.  No need to ever get PAP or
5114                  * CHAP secrets back to userland anyway.
5115                  */
5116                 spr->defs.pp_phase = sp->pp_phase;
5117                 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0;
5118                 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0;
5119                 spr->defs.lcp = sp->lcp;
5120                 spr->defs.ipcp = sp->ipcp;
5121                 spr->defs.ipv6cp = sp->ipv6cp;
5122                 spr->defs.myauth = sp->myauth;
5123                 spr->defs.hisauth = sp->hisauth;
5124                 bzero(spr->defs.myauth.secret, AUTHKEYLEN);
5125                 bzero(spr->defs.myauth.challenge, AUTHKEYLEN);
5126                 bzero(spr->defs.hisauth.secret, AUTHKEYLEN);
5127                 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN);
5128                 /*
5129                  * Fixup the LCP timeout value to milliseconds so
5130                  * spppcontrol doesn't need to bother about the value
5131                  * of "hz".  We do the reverse calculation below when
5132                  * setting it.
5133                  */
5134                 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz;
5135                 rv = copyout(spr, (caddr_t)ifr->ifr_data,
5136                              sizeof(struct spppreq));
5137                 break;
5138
5139         case (int)SPPPIOSDEFS:
5140                 if (cmd != SIOCSIFGENERIC) {
5141                         rv = EINVAL;
5142                         break;
5143                 }
5144                 /*
5145                  * We have a very specific idea of which fields we
5146                  * allow being passed back from userland, so to not
5147                  * clobber our current state.  For one, we only allow
5148                  * setting anything if LCP is in dead or establish
5149                  * phase.  Once the authentication negotiations
5150                  * started, the authentication settings must not be
5151                  * changed again.  (The administrator can force an
5152                  * ifconfig down in order to get LCP back into dead
5153                  * phase.)
5154                  *
5155                  * Also, we only allow for authentication parameters to be
5156                  * specified.
5157                  *
5158                  * XXX Should allow to set or clear pp_flags.
5159                  *
5160                  * Finally, if the respective authentication protocol to
5161                  * be used is set differently than 0, but the secret is
5162                  * passed as all zeros, we don't trash the existing secret.
5163                  * This allows an administrator to change the system name
5164                  * only without clobbering the secret (which he didn't get
5165                  * back in a previous SPPPIOGDEFS call).  However, the
5166                  * secrets are cleared if the authentication protocol is
5167                  * reset to 0.  */
5168                 if (sp->pp_phase != PHASE_DEAD &&
5169                     sp->pp_phase != PHASE_ESTABLISH) {
5170                         rv = EBUSY;
5171                         break;
5172                 }
5173
5174                 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP &&
5175                      spr->defs.myauth.proto != PPP_CHAP) ||
5176                     (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP &&
5177                      spr->defs.hisauth.proto != PPP_CHAP)) {
5178                         rv = EINVAL;
5179                         break;
5180                 }
5181
5182                 if (spr->defs.myauth.proto == 0)
5183                         /* resetting myauth */
5184                         bzero(&sp->myauth, sizeof sp->myauth);
5185                 else {
5186                         /* setting/changing myauth */
5187                         sp->myauth.proto = spr->defs.myauth.proto;
5188                         bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
5189                         if (spr->defs.myauth.secret[0] != '\0')
5190                                 bcopy(spr->defs.myauth.secret, sp->myauth.secret,
5191                                       AUTHKEYLEN);
5192                 }
5193                 if (spr->defs.hisauth.proto == 0)
5194                         /* resetting hisauth */
5195                         bzero(&sp->hisauth, sizeof sp->hisauth);
5196                 else {
5197                         /* setting/changing hisauth */
5198                         sp->hisauth.proto = spr->defs.hisauth.proto;
5199                         sp->hisauth.flags = spr->defs.hisauth.flags;
5200                         bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
5201                         if (spr->defs.hisauth.secret[0] != '\0')
5202                                 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret,
5203                                       AUTHKEYLEN);
5204                 }
5205                 /* set LCP restart timer timeout */
5206                 if (spr->defs.lcp.timeout != 0)
5207                         sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000;
5208                 /* set VJ enable and IPv6 disable flags */
5209 #ifdef INET
5210                 if (spr->defs.enable_vj)
5211                         sp->confflags |= CONF_ENABLE_VJ;
5212                 else
5213                         sp->confflags &= ~CONF_ENABLE_VJ;
5214 #endif
5215 #ifdef INET6
5216                 if (spr->defs.enable_ipv6)
5217                         sp->confflags |= CONF_ENABLE_IPV6;
5218                 else
5219                         sp->confflags &= ~CONF_ENABLE_IPV6;
5220 #endif
5221                 break;
5222
5223         default:
5224                 rv = EINVAL;
5225         }
5226
5227  quit:
5228         kfree(spr, M_TEMP);
5229
5230         return (rv);
5231 }
5232
5233 static void
5234 sppp_phase_network(struct sppp *sp)
5235 {
5236         STDDCL;
5237         int i;
5238         u_long mask;
5239
5240         sp->pp_phase = PHASE_NETWORK;
5241
5242         if (debug)
5243                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
5244                     sppp_phase_name(sp->pp_phase));
5245
5246         /* Notify NCPs now. */
5247         for (i = 0; i < IDX_COUNT; i++)
5248                 if ((cps[i])->flags & CP_NCP)
5249                         (cps[i])->Open(sp);
5250
5251         /* Send Up events to all NCPs. */
5252         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
5253                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP))
5254                         (cps[i])->Up(sp);
5255
5256         /* if no NCP is starting, all this was in vain, close down */
5257         sppp_lcp_check_and_close(sp);
5258 }
5259
5260
5261 static const char *
5262 sppp_cp_type_name(u_char type)
5263 {
5264         static char buf[12];
5265         switch (type) {
5266         case CONF_REQ:   return "conf-req";
5267         case CONF_ACK:   return "conf-ack";
5268         case CONF_NAK:   return "conf-nak";
5269         case CONF_REJ:   return "conf-rej";
5270         case TERM_REQ:   return "term-req";
5271         case TERM_ACK:   return "term-ack";
5272         case CODE_REJ:   return "code-rej";
5273         case PROTO_REJ:  return "proto-rej";
5274         case ECHO_REQ:   return "echo-req";
5275         case ECHO_REPLY: return "echo-reply";
5276         case DISC_REQ:   return "discard-req";
5277         }
5278         ksnprintf (buf, sizeof(buf), "cp/0x%x", type);
5279         return buf;
5280 }
5281
5282 static const char *
5283 sppp_auth_type_name(u_short proto, u_char type)
5284 {
5285         static char buf[12];
5286         switch (proto) {
5287         case PPP_CHAP:
5288                 switch (type) {
5289                 case CHAP_CHALLENGE:    return "challenge";
5290                 case CHAP_RESPONSE:     return "response";
5291                 case CHAP_SUCCESS:      return "success";
5292                 case CHAP_FAILURE:      return "failure";
5293                 }
5294         case PPP_PAP:
5295                 switch (type) {
5296                 case PAP_REQ:           return "req";
5297                 case PAP_ACK:           return "ack";
5298                 case PAP_NAK:           return "nak";
5299                 }
5300         }
5301         ksnprintf (buf, sizeof(buf), "auth/0x%x", type);
5302         return buf;
5303 }
5304
5305 static const char *
5306 sppp_lcp_opt_name(u_char opt)
5307 {
5308         static char buf[12];
5309         switch (opt) {
5310         case LCP_OPT_MRU:               return "mru";
5311         case LCP_OPT_ASYNC_MAP:         return "async-map";
5312         case LCP_OPT_AUTH_PROTO:        return "auth-proto";
5313         case LCP_OPT_QUAL_PROTO:        return "qual-proto";
5314         case LCP_OPT_MAGIC:             return "magic";
5315         case LCP_OPT_PROTO_COMP:        return "proto-comp";
5316         case LCP_OPT_ADDR_COMP:         return "addr-comp";
5317         }
5318         ksnprintf (buf, sizeof(buf), "lcp/0x%x", opt);
5319         return buf;
5320 }
5321
5322 static const char *
5323 sppp_ipcp_opt_name(u_char opt)
5324 {
5325         static char buf[12];
5326         switch (opt) {
5327         case IPCP_OPT_ADDRESSES:        return "addresses";
5328         case IPCP_OPT_COMPRESSION:      return "compression";
5329         case IPCP_OPT_ADDRESS:          return "address";
5330         }
5331         ksnprintf (buf, sizeof(buf), "ipcp/0x%x", opt);
5332         return buf;
5333 }
5334
5335 #ifdef INET6
5336 static const char *
5337 sppp_ipv6cp_opt_name(u_char opt)
5338 {
5339         static char buf[12];
5340         switch (opt) {
5341         case IPV6CP_OPT_IFID:           return "ifid";
5342         case IPV6CP_OPT_COMPRESSION:    return "compression";
5343         }
5344         ksprintf (buf, "0x%x", opt);
5345         return buf;
5346 }
5347 #endif
5348
5349 static const char *
5350 sppp_state_name(int state)
5351 {
5352         switch (state) {
5353         case STATE_INITIAL:     return "initial";
5354         case STATE_STARTING:    return "starting";
5355         case STATE_CLOSED:      return "closed";
5356         case STATE_STOPPED:     return "stopped";
5357         case STATE_CLOSING:     return "closing";
5358         case STATE_STOPPING:    return "stopping";
5359         case STATE_REQ_SENT:    return "req-sent";
5360         case STATE_ACK_RCVD:    return "ack-rcvd";
5361         case STATE_ACK_SENT:    return "ack-sent";
5362         case STATE_OPENED:      return "opened";
5363         }
5364         return "illegal";
5365 }
5366
5367 static const char *
5368 sppp_phase_name(enum ppp_phase phase)
5369 {
5370         switch (phase) {
5371         case PHASE_DEAD:        return "dead";
5372         case PHASE_ESTABLISH:   return "establish";
5373         case PHASE_TERMINATE:   return "terminate";
5374         case PHASE_AUTHENTICATE: return "authenticate";
5375         case PHASE_NETWORK:     return "network";
5376         }
5377         return "illegal";
5378 }
5379
5380 static const char *
5381 sppp_proto_name(u_short proto)
5382 {
5383         static char buf[12];
5384         switch (proto) {
5385         case PPP_LCP:   return "lcp";
5386         case PPP_IPCP:  return "ipcp";
5387         case PPP_PAP:   return "pap";
5388         case PPP_CHAP:  return "chap";
5389         case PPP_IPV6CP: return "ipv6cp";
5390         }
5391         ksnprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto);
5392         return buf;
5393 }
5394
5395 static void
5396 sppp_print_bytes(const u_char *p, u_short len)
5397 {
5398         if (len)
5399                 log(-1, " %*D", len, p, "-");
5400 }
5401
5402 static void
5403 sppp_print_string(const char *p, u_short len)
5404 {
5405         u_char c;
5406
5407         while (len-- > 0) {
5408                 c = *p++;
5409                 /*
5410                  * Print only ASCII chars directly.  RFC 1994 recommends
5411                  * using only them, but we don't rely on it.  */
5412                 if (c < ' ' || c > '~')
5413                         log(-1, "\\x%x", c);
5414                 else
5415                         log(-1, "%c", c);
5416         }
5417 }
5418
5419 static const char *
5420 sppp_dotted_quad(u_long addr)
5421 {
5422         static char s[16];
5423         ksprintf(s, "%d.%d.%d.%d",
5424                 (int)((addr >> 24) & 0xff),
5425                 (int)((addr >> 16) & 0xff),
5426                 (int)((addr >> 8) & 0xff),
5427                 (int)(addr & 0xff));
5428         return s;
5429 }
5430
5431 static int
5432 sppp_strnlen(u_char *p, int max)
5433 {
5434         int len;
5435
5436         for (len = 0; len < max && *p; ++p)
5437                 ++len;
5438         return len;
5439 }
5440
5441 /* a dummy, used to drop uninteresting events */
5442 static void
5443 sppp_null(struct sppp *unused)
5444 {
5445         /* do just nothing */
5446 }