sys/net/if_spppsubr.c

   1 /*
   2  * Synchronous PPP/Cisco/Frame Relay link level subroutines.
   3  * Keepalive protocol implemented in both Cisco and PPP modes.
   4  */
   5 /*-
   6  * Copyright (C) 1994-2000 Cronyx Engineering.
   7  * Author: Serge Vakulenko, <vak@cronyx.ru>
   8  *
   9  * Heavily revamped to conform to RFC 1661.
  10  * Copyright (C) 1997, 2001 Joerg Wunsch.
  11  *
  12  * This software is distributed with NO WARRANTIES, not even the implied
  13  * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  14  *
  15  * Authors grant any other persons or organisations permission to use
  16  * or modify this software as long as this message is kept with the software,
  17  * all derivative works or modified versions.
  18  *
  19  * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997
  20  *
  21  * $FreeBSD$
  22  */
  23
  24 #include <sys/param.h>
  25
  26 #include "opt_inet.h"
  27 #include "opt_inet6.h"
  28
  29 #include <sys/systm.h>
  30 #include <sys/kernel.h>
  31 #include <sys/lock.h>
  32 #include <sys/module.h>
  33 #include <sys/rmlock.h>
  34 #include <sys/sockio.h>
  35 #include <sys/socket.h>
  36 #include <sys/syslog.h>
  37 #include <sys/random.h>
  38 #include <sys/malloc.h>
  39 #include <sys/mbuf.h>
  40
  41 #include <sys/md5.h>
  42
  43 #include <net/if.h>
  44 #include <net/if_var.h>
  45 #include <net/netisr.h>
  46 #include <net/if_types.h>
  47 #include <net/route.h>
  48 #include <net/vnet.h>
  49 #include <netinet/in.h>
  50 #include <netinet/in_systm.h>
  51 #include <netinet/ip.h>
  52 #include <net/slcompress.h>
  53
  54 #include <machine/stdarg.h>
  55
  56 #include <netinet/in_var.h>
  57
  58 #ifdef INET
  59 #include <netinet/ip.h>
  60 #include <netinet/tcp.h>
  61 #endif
  62
  63 #ifdef INET6
  64 #include <netinet6/scope6_var.h>
  65 #endif
  66
  67 #include <netinet/if_ether.h>
  68
  69 #include <net/if_sppp.h>
  70
  71 #define IOCTL_CMD_T     u_long
  72 #define MAXALIVECNT     3               /* max. alive packets */
  73
  74 /*
  75  * Interface flags that can be set in an ifconfig command.
  76  *
  77  * Setting link0 will make the link passive, i.e. it will be marked
  78  * as being administrative openable, but won't be opened to begin
  79  * with.  Incoming calls will be answered, or subsequent calls with
  80  * -link1 will cause the administrative open of the LCP layer.
  81  *
  82  * Setting link1 will cause the link to auto-dial only as packets
  83  * arrive to be sent.
  84  *
  85  * Setting IFF_DEBUG will syslog the option negotiation and state
  86  * transitions at level kern.debug.  Note: all logs consistently look
  87  * like
  88  *
  89  *   <if-name><unit>: <proto-name> <additional info...>
  90  *
  91  * with <if-name><unit> being something like "bppp0", and <proto-name>
  92  * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
  93  */
  94
  95 #define IFF_PASSIVE     IFF_LINK0       /* wait passively for connection */
  96 #define IFF_AUTO        IFF_LINK1       /* auto-dial on output */
  97 #define IFF_CISCO       IFF_LINK2       /* auto-dial on output */
  98
  99 #define PPP_ALLSTATIONS 0xff            /* All-Stations broadcast address */
 100 #define PPP_UI          0x03            /* Unnumbered Information */
 101 #define PPP_IP          0x0021          /* Internet Protocol */
 102 #define PPP_ISO         0x0023          /* ISO OSI Protocol */
 103 #define PPP_XNS         0x0025          /* Xerox NS Protocol */
 104 #define PPP_IPX         0x002b          /* Novell IPX Protocol */
 105 #define PPP_VJ_COMP     0x002d          /* VJ compressed TCP/IP */
 106 #define PPP_VJ_UCOMP    0x002f          /* VJ uncompressed TCP/IP */
 107 #define PPP_IPV6        0x0057          /* Internet Protocol Version 6 */
 108 #define PPP_LCP         0xc021          /* Link Control Protocol */
 109 #define PPP_PAP         0xc023          /* Password Authentication Protocol */
 110 #define PPP_CHAP        0xc223          /* Challenge-Handshake Auth Protocol */
 111 #define PPP_IPCP        0x8021          /* Internet Protocol Control Protocol */
 112 #define PPP_IPV6CP      0x8057          /* IPv6 Control Protocol */
 113
 114 #define CONF_REQ        1               /* PPP configure request */
 115 #define CONF_ACK        2               /* PPP configure acknowledge */
 116 #define CONF_NAK        3               /* PPP configure negative ack */
 117 #define CONF_REJ        4               /* PPP configure reject */
 118 #define TERM_REQ        5               /* PPP terminate request */
 119 #define TERM_ACK        6               /* PPP terminate acknowledge */
 120 #define CODE_REJ        7               /* PPP code reject */
 121 #define PROTO_REJ       8               /* PPP protocol reject */
 122 #define ECHO_REQ        9               /* PPP echo request */
 123 #define ECHO_REPLY      10              /* PPP echo reply */
 124 #define DISC_REQ        11              /* PPP discard request */
 125
 126 #define LCP_OPT_MRU             1       /* maximum receive unit */
 127 #define LCP_OPT_ASYNC_MAP       2       /* async control character map */
 128 #define LCP_OPT_AUTH_PROTO      3       /* authentication protocol */
 129 #define LCP_OPT_QUAL_PROTO      4       /* quality protocol */
 130 #define LCP_OPT_MAGIC           5       /* magic number */
 131 #define LCP_OPT_RESERVED        6       /* reserved */
 132 #define LCP_OPT_PROTO_COMP      7       /* protocol field compression */
 133 #define LCP_OPT_ADDR_COMP       8       /* address/control field compression */
 134
 135 #define IPCP_OPT_ADDRESSES      1       /* both IP addresses; deprecated */
 136 #define IPCP_OPT_COMPRESSION    2       /* IP compression protocol (VJ) */
 137 #define IPCP_OPT_ADDRESS        3       /* local IP address */
 138
 139 #define IPV6CP_OPT_IFID 1       /* interface identifier */
 140 #define IPV6CP_OPT_COMPRESSION  2       /* IPv6 compression protocol */
 141
 142 #define IPCP_COMP_VJ            0x2d    /* Code for VJ compression */
 143
 144 #define PAP_REQ                 1       /* PAP name/password request */
 145 #define PAP_ACK                 2       /* PAP acknowledge */
 146 #define PAP_NAK                 3       /* PAP fail */
 147
 148 #define CHAP_CHALLENGE          1       /* CHAP challenge request */
 149 #define CHAP_RESPONSE           2       /* CHAP challenge response */
 150 #define CHAP_SUCCESS            3       /* CHAP response ok */
 151 #define CHAP_FAILURE            4       /* CHAP response failed */
 152
 153 #define CHAP_MD5                5       /* hash algorithm - MD5 */
 154
 155 #define CISCO_MULTICAST         0x8f    /* Cisco multicast address */
 156 #define CISCO_UNICAST           0x0f    /* Cisco unicast address */
 157 #define CISCO_KEEPALIVE         0x8035  /* Cisco keepalive protocol */
 158 #define CISCO_ADDR_REQ          0       /* Cisco address request */
 159 #define CISCO_ADDR_REPLY        1       /* Cisco address reply */
 160 #define CISCO_KEEPALIVE_REQ     2       /* Cisco keepalive request */
 161
 162 /* states are named and numbered according to RFC 1661 */
 163 #define STATE_INITIAL   0
 164 #define STATE_STARTING  1
 165 #define STATE_CLOSED    2
 166 #define STATE_STOPPED   3
 167 #define STATE_CLOSING   4
 168 #define STATE_STOPPING  5
 169 #define STATE_REQ_SENT  6
 170 #define STATE_ACK_RCVD  7
 171 #define STATE_ACK_SENT  8
 172 #define STATE_OPENED    9
 173
 174 static MALLOC_DEFINE(M_SPPP, "sppp", "synchronous PPP interface internals");
 175
 176 struct ppp_header {
 177         u_char address;
 178         u_char control;
 179         u_short protocol;
 180 } __packed;
 181 #define PPP_HEADER_LEN          sizeof (struct ppp_header)
 182
 183 struct lcp_header {
 184         u_char type;
 185         u_char ident;
 186         u_short len;
 187 } __packed;
 188 #define LCP_HEADER_LEN          sizeof (struct lcp_header)
 189
 190 struct cisco_packet {
 191         u_long type;
 192         u_long par1;
 193         u_long par2;
 194         u_short rel;
 195         u_short time0;
 196         u_short time1;
 197 } __packed;
 198 #define CISCO_PACKET_LEN        sizeof (struct cisco_packet)
 199
 200 /*
 201  * We follow the spelling and capitalization of RFC 1661 here, to make
 202  * it easier comparing with the standard.  Please refer to this RFC in
 203  * case you can't make sense out of these abbreviation; it will also
 204  * explain the semantics related to the various events and actions.
 205  */
 206 struct cp {
 207         u_short proto;          /* PPP control protocol number */
 208         u_char protoidx;        /* index into state table in struct sppp */
 209         u_char flags;
 210 #define CP_LCP          0x01    /* this is the LCP */
 211 #define CP_AUTH         0x02    /* this is an authentication protocol */
 212 #define CP_NCP          0x04    /* this is a NCP */
 213 #define CP_QUAL         0x08    /* this is a quality reporting protocol */
 214         const char *name;       /* name of this control protocol */
 215         /* event handlers */
 216         void    (*Up)(struct sppp *sp);
 217         void    (*Down)(struct sppp *sp);
 218         void    (*Open)(struct sppp *sp);
 219         void    (*Close)(struct sppp *sp);
 220         void    (*TO)(void *sp);
 221         int     (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
 222         void    (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
 223         void    (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
 224         /* actions */
 225         void    (*tlu)(struct sppp *sp);
 226         void    (*tld)(struct sppp *sp);
 227         void    (*tls)(struct sppp *sp);
 228         void    (*tlf)(struct sppp *sp);
 229         void    (*scr)(struct sppp *sp);
 230 };
 231
 232 #define SPP_FMT         "%s: "
 233 #define SPP_ARGS(ifp)   (ifp)->if_xname
 234
 235 #define SPPP_LOCK(sp)   mtx_lock (&(sp)->mtx)
 236 #define SPPP_UNLOCK(sp) mtx_unlock (&(sp)->mtx)
 237 #define SPPP_LOCK_ASSERT(sp)    mtx_assert (&(sp)->mtx, MA_OWNED)
 238 #define SPPP_LOCK_OWNED(sp)     mtx_owned (&(sp)->mtx)
 239
 240 #ifdef INET
 241 /*
 242  * The following disgusting hack gets around the problem that IP TOS
 243  * can't be set yet.  We want to put "interactive" traffic on a high
 244  * priority queue.  To decide if traffic is interactive, we check that
 245  * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
 246  *
 247  * XXX is this really still necessary?  - joerg -
 248  */
 249 static const u_short interactive_ports[8] = {
 250         0,      513,    0,      0,
 251         0,      21,     0,      23,
 252 };
 253 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
 254 #endif
 255
 256 /* almost every function needs these */
 257 #define STDDCL                                                  \
 258         struct ifnet *ifp = SP2IFP(sp);                         \
 259         int debug = ifp->if_flags & IFF_DEBUG
 260
 261 static int sppp_output(struct ifnet *ifp, struct mbuf *m,
 262         const struct sockaddr *dst, struct route *ro);
 263
 264 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
 265 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
 266
 267 static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
 268                           struct mbuf *m);
 269 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
 270                          u_char ident, u_short len, void *data);
 271 /* static void sppp_cp_timeout(void *arg); */
 272 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
 273                                  int newstate);
 274 static void sppp_auth_send(const struct cp *cp,
 275                            struct sppp *sp, unsigned int type, unsigned int id,
 276                            ...);
 277
 278 static void sppp_up_event(const struct cp *cp, struct sppp *sp);
 279 static void sppp_down_event(const struct cp *cp, struct sppp *sp);
 280 static void sppp_open_event(const struct cp *cp, struct sppp *sp);
 281 static void sppp_close_event(const struct cp *cp, struct sppp *sp);
 282 static void sppp_to_event(const struct cp *cp, struct sppp *sp);
 283
 284 static void sppp_null(struct sppp *sp);
 285
 286 static void sppp_pp_up(struct sppp *sp);
 287 static void sppp_pp_down(struct sppp *sp);
 288
 289 static void sppp_lcp_init(struct sppp *sp);
 290 static void sppp_lcp_up(struct sppp *sp);
 291 static void sppp_lcp_down(struct sppp *sp);
 292 static void sppp_lcp_open(struct sppp *sp);
 293 static void sppp_lcp_close(struct sppp *sp);
 294 static void sppp_lcp_TO(void *sp);
 295 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 296 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 297 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 298 static void sppp_lcp_tlu(struct sppp *sp);
 299 static void sppp_lcp_tld(struct sppp *sp);
 300 static void sppp_lcp_tls(struct sppp *sp);
 301 static void sppp_lcp_tlf(struct sppp *sp);
 302 static void sppp_lcp_scr(struct sppp *sp);
 303 static void sppp_lcp_check_and_close(struct sppp *sp);
 304 static int sppp_ncp_check(struct sppp *sp);
 305
 306 static void sppp_ipcp_init(struct sppp *sp);
 307 static void sppp_ipcp_up(struct sppp *sp);
 308 static void sppp_ipcp_down(struct sppp *sp);
 309 static void sppp_ipcp_open(struct sppp *sp);
 310 static void sppp_ipcp_close(struct sppp *sp);
 311 static void sppp_ipcp_TO(void *sp);
 312 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 313 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 314 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 315 static void sppp_ipcp_tlu(struct sppp *sp);
 316 static void sppp_ipcp_tld(struct sppp *sp);
 317 static void sppp_ipcp_tls(struct sppp *sp);
 318 static void sppp_ipcp_tlf(struct sppp *sp);
 319 static void sppp_ipcp_scr(struct sppp *sp);
 320
 321 static void sppp_ipv6cp_init(struct sppp *sp);
 322 static void sppp_ipv6cp_up(struct sppp *sp);
 323 static void sppp_ipv6cp_down(struct sppp *sp);
 324 static void sppp_ipv6cp_open(struct sppp *sp);
 325 static void sppp_ipv6cp_close(struct sppp *sp);
 326 static void sppp_ipv6cp_TO(void *sp);
 327 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 328 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 329 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 330 static void sppp_ipv6cp_tlu(struct sppp *sp);
 331 static void sppp_ipv6cp_tld(struct sppp *sp);
 332 static void sppp_ipv6cp_tls(struct sppp *sp);
 333 static void sppp_ipv6cp_tlf(struct sppp *sp);
 334 static void sppp_ipv6cp_scr(struct sppp *sp);
 335
 336 static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
 337 static void sppp_pap_init(struct sppp *sp);
 338 static void sppp_pap_open(struct sppp *sp);
 339 static void sppp_pap_close(struct sppp *sp);
 340 static void sppp_pap_TO(void *sp);
 341 static void sppp_pap_my_TO(void *sp);
 342 static void sppp_pap_tlu(struct sppp *sp);
 343 static void sppp_pap_tld(struct sppp *sp);
 344 static void sppp_pap_scr(struct sppp *sp);
 345
 346 static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
 347 static void sppp_chap_init(struct sppp *sp);
 348 static void sppp_chap_open(struct sppp *sp);
 349 static void sppp_chap_close(struct sppp *sp);
 350 static void sppp_chap_TO(void *sp);
 351 static void sppp_chap_tlu(struct sppp *sp);
 352 static void sppp_chap_tld(struct sppp *sp);
 353 static void sppp_chap_scr(struct sppp *sp);
 354
 355 static const char *sppp_auth_type_name(u_short proto, u_char type);
 356 static const char *sppp_cp_type_name(u_char type);
 357 #ifdef INET
 358 static const char *sppp_dotted_quad(u_long addr);
 359 static const char *sppp_ipcp_opt_name(u_char opt);
 360 #endif
 361 #ifdef INET6
 362 static const char *sppp_ipv6cp_opt_name(u_char opt);
 363 #endif
 364 static const char *sppp_lcp_opt_name(u_char opt);
 365 static const char *sppp_phase_name(enum ppp_phase phase);
 366 static const char *sppp_proto_name(u_short proto);
 367 static const char *sppp_state_name(int state);
 368 static int sppp_params(struct sppp *sp, u_long cmd, void *data);
 369 static int sppp_strnlen(u_char *p, int max);
 370 static void sppp_keepalive(void *dummy);
 371 static void sppp_phase_network(struct sppp *sp);
 372 static void sppp_print_bytes(const u_char *p, u_short len);
 373 static void sppp_print_string(const char *p, u_short len);
 374 static void sppp_qflush(struct ifqueue *ifq);
 375 #ifdef INET
 376 static void sppp_set_ip_addr(struct sppp *sp, u_long src);
 377 #endif
 378 #ifdef INET6
 379 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src,
 380                                struct in6_addr *dst, struct in6_addr *srcmask);
 381 #ifdef IPV6CP_MYIFID_DYN
 382 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src);
 383 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src);
 384 #endif
 385 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src);
 386 #endif
 387
 388 /* if_start () wrapper */
 389 static void sppp_ifstart (struct ifnet *ifp);
 390
 391 /* our control protocol descriptors */
 392 static const struct cp lcp = {
 393         PPP_LCP, IDX_LCP, CP_LCP, "lcp",
 394         sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
 395         sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
 396         sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
 397         sppp_lcp_scr
 398 };
 399
 400 static const struct cp ipcp = {
 401         PPP_IPCP, IDX_IPCP,
 402 #ifdef INET     /* don't run IPCP if there's no IPv4 support */
 403         CP_NCP,
 404 #else
 405         0,
 406 #endif
 407         "ipcp",
 408         sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
 409         sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
 410         sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
 411         sppp_ipcp_scr
 412 };
 413
 414 static const struct cp ipv6cp = {
 415         PPP_IPV6CP, IDX_IPV6CP,
 416 #ifdef INET6    /*don't run IPv6CP if there's no IPv6 support*/
 417         CP_NCP,
 418 #else
 419         0,
 420 #endif
 421         "ipv6cp",
 422         sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close,
 423         sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak,
 424         sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf,
 425         sppp_ipv6cp_scr
 426 };
 427
 428 static const struct cp pap = {
 429         PPP_PAP, IDX_PAP, CP_AUTH, "pap",
 430         sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
 431         sppp_pap_TO, 0, 0, 0,
 432         sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
 433         sppp_pap_scr
 434 };
 435
 436 static const struct cp chap = {
 437         PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
 438         sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
 439         sppp_chap_TO, 0, 0, 0,
 440         sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
 441         sppp_chap_scr
 442 };
 443
 444 static const struct cp *cps[IDX_COUNT] = {
 445         &lcp,                   /* IDX_LCP */
 446         &ipcp,                  /* IDX_IPCP */
 447         &ipv6cp,                /* IDX_IPV6CP */
 448         &pap,                   /* IDX_PAP */
 449         &chap,                  /* IDX_CHAP */
 450 };
 451
 452 static void*
 453 sppp_alloc(u_char type, struct ifnet *ifp)
 454 {
 455         struct sppp     *sp;
 456
 457         sp = malloc(sizeof(struct sppp), M_SPPP, M_WAITOK | M_ZERO);
 458         sp->pp_ifp = ifp;
 459
 460         return (sp);
 461 }
 462
 463 static void
 464 sppp_free(void *com, u_char type)
 465 {
 466
 467         free(com, M_SPPP);
 468 }
 469
 470 static int
 471 sppp_modevent(module_t mod, int type, void *unused)
 472 {
 473         switch (type) {
 474         case MOD_LOAD:
 475                 /*
 476                  * XXX: should probably be IFT_SPPP, but it's fairly
 477                  * harmless to allocate struct sppp's for non-sppp
 478                  * interfaces.
 479                  */
 480
 481                 if_register_com_alloc(IFT_PPP, sppp_alloc, sppp_free);
 482                 break;
 483         case MOD_UNLOAD:
 484                 /* if_deregister_com_alloc(IFT_PPP); */
 485                 return EACCES;
 486         default:
 487                 return EOPNOTSUPP;
 488         }
 489         return 0;
 490 }
 491 static moduledata_t spppmod = {
 492         "sppp",
 493         sppp_modevent,
 494         0
 495 };
 496 MODULE_VERSION(sppp, 1);
 497 DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY);
 498
 499 /*
 500  * Exported functions, comprising our interface to the lower layer.
 501  */
 502
 503 /*
 504  * Process the received packet.
 505  */
 506 void
 507 sppp_input(struct ifnet *ifp, struct mbuf *m)
 508 {
 509         struct ppp_header *h;
 510         int isr = -1;
 511         struct sppp *sp = IFP2SP(ifp);
 512         int debug, do_account = 0;
 513 #ifdef INET
 514         int hlen, vjlen;
 515         u_char *iphdr;
 516 #endif
 517
 518         SPPP_LOCK(sp);
 519         debug = ifp->if_flags & IFF_DEBUG;
 520
 521         if (ifp->if_flags & IFF_UP)
 522                 /* Count received bytes, add FCS and one flag */
 523                 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len + 3);
 524
 525         if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
 526                 /* Too small packet, drop it. */
 527                 if (debug)
 528                         log(LOG_DEBUG,
 529                             SPP_FMT "input packet is too small, %d bytes\n",
 530                             SPP_ARGS(ifp), m->m_pkthdr.len);
 531           drop:
 532                 m_freem (m);
 533                 SPPP_UNLOCK(sp);
 534           drop2:
 535                 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 536                 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
 537                 return;
 538         }
 539
 540         if (sp->pp_mode == PP_FR) {
 541                 sppp_fr_input (sp, m);
 542                 SPPP_UNLOCK(sp);
 543                 return;
 544         }
 545
 546         /* Get PPP header. */
 547         h = mtod (m, struct ppp_header*);
 548         m_adj (m, PPP_HEADER_LEN);
 549
 550         switch (h->address) {
 551         case PPP_ALLSTATIONS:
 552                 if (h->control != PPP_UI)
 553                         goto invalid;
 554                 if (sp->pp_mode == IFF_CISCO) {
 555                         if (debug)
 556                                 log(LOG_DEBUG,
 557                                     SPP_FMT "PPP packet in Cisco mode "
 558                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 559                                     SPP_ARGS(ifp),
 560                                     h->address, h->control, ntohs(h->protocol));
 561                         goto drop;
 562                 }
 563                 switch (ntohs (h->protocol)) {
 564                 default:
 565                         if (debug)
 566                                 log(LOG_DEBUG,
 567                                     SPP_FMT "rejecting protocol "
 568                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 569                                     SPP_ARGS(ifp),
 570                                     h->address, h->control, ntohs(h->protocol));
 571                         if (sp->state[IDX_LCP] == STATE_OPENED)
 572                                 sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
 573                                         ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2,
 574                                         &h->protocol);
 575                         if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
 576                         goto drop;
 577                 case PPP_LCP:
 578                         sppp_cp_input(&lcp, sp, m);
 579                         m_freem (m);
 580                         SPPP_UNLOCK(sp);
 581                         return;
 582                 case PPP_PAP:
 583                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
 584                                 sppp_pap_input(sp, m);
 585                         m_freem (m);
 586                         SPPP_UNLOCK(sp);
 587                         return;
 588                 case PPP_CHAP:
 589                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
 590                                 sppp_chap_input(sp, m);
 591                         m_freem (m);
 592                         SPPP_UNLOCK(sp);
 593                         return;
 594 #ifdef INET
 595                 case PPP_IPCP:
 596                         if (sp->pp_phase == PHASE_NETWORK)
 597                                 sppp_cp_input(&ipcp, sp, m);
 598                         m_freem (m);
 599                         SPPP_UNLOCK(sp);
 600                         return;
 601                 case PPP_IP:
 602                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 603                                 isr = NETISR_IP;
 604                         }
 605                         do_account++;
 606                         break;
 607                 case PPP_VJ_COMP:
 608                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 609                                 if ((vjlen =
 610                                      sl_uncompress_tcp_core(mtod(m, u_char *),
 611                                                             m->m_len, m->m_len,
 612                                                             TYPE_COMPRESSED_TCP,
 613                                                             sp->pp_comp,
 614                                                             &iphdr, &hlen)) <= 0) {
 615                                         if (debug)
 616                                                 log(LOG_INFO,
 617                             SPP_FMT "VJ uncompress failed on compressed packet\n",
 618                                                     SPP_ARGS(ifp));
 619                                         goto drop;
 620                                 }
 621
 622                                 /*
 623                                  * Trim the VJ header off the packet, and prepend
 624                                  * the uncompressed IP header (which will usually
 625                                  * end up in two chained mbufs since there's not
 626                                  * enough leading space in the existing mbuf).
 627                                  */
 628                                 m_adj(m, vjlen);
 629                                 M_PREPEND(m, hlen, M_NOWAIT);
 630                                 if (m == NULL) {
 631                                         SPPP_UNLOCK(sp);
 632                                         goto drop2;
 633                                 }
 634                                 bcopy(iphdr, mtod(m, u_char *), hlen);
 635                                 isr = NETISR_IP;
 636                         }
 637                         do_account++;
 638                         break;
 639                 case PPP_VJ_UCOMP:
 640                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 641                                 if (sl_uncompress_tcp_core(mtod(m, u_char *),
 642                                                            m->m_len, m->m_len,
 643                                                            TYPE_UNCOMPRESSED_TCP,
 644                                                            sp->pp_comp,
 645                                                            &iphdr, &hlen) != 0) {
 646                                         if (debug)
 647                                                 log(LOG_INFO,
 648                             SPP_FMT "VJ uncompress failed on uncompressed packet\n",
 649                                                     SPP_ARGS(ifp));
 650                                         goto drop;
 651                                 }
 652                                 isr = NETISR_IP;
 653                         }
 654                         do_account++;
 655                         break;
 656 #endif
 657 #ifdef INET6
 658                 case PPP_IPV6CP:
 659                         if (sp->pp_phase == PHASE_NETWORK)
 660                             sppp_cp_input(&ipv6cp, sp, m);
 661                         m_freem (m);
 662                         SPPP_UNLOCK(sp);
 663                         return;
 664
 665                 case PPP_IPV6:
 666                         if (sp->state[IDX_IPV6CP] == STATE_OPENED)
 667                                 isr = NETISR_IPV6;
 668                         do_account++;
 669                         break;
 670 #endif
 671                 }
 672                 break;
 673         case CISCO_MULTICAST:
 674         case CISCO_UNICAST:
 675                 /* Don't check the control field here (RFC 1547). */
 676                 if (sp->pp_mode != IFF_CISCO) {
 677                         if (debug)
 678                                 log(LOG_DEBUG,
 679                                     SPP_FMT "Cisco packet in PPP mode "
 680                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 681                                     SPP_ARGS(ifp),
 682                                     h->address, h->control, ntohs(h->protocol));
 683                         goto drop;
 684                 }
 685                 switch (ntohs (h->protocol)) {
 686                 default:
 687                         if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
 688                         goto invalid;
 689                 case CISCO_KEEPALIVE:
 690                         sppp_cisco_input (sp, m);
 691                         m_freem (m);
 692                         SPPP_UNLOCK(sp);
 693                         return;
 694 #ifdef INET
 695                 case ETHERTYPE_IP:
 696                         isr = NETISR_IP;
 697                         do_account++;
 698                         break;
 699 #endif
 700 #ifdef INET6
 701                 case ETHERTYPE_IPV6:
 702                         isr = NETISR_IPV6;
 703                         do_account++;
 704                         break;
 705 #endif
 706                 }
 707                 break;
 708         default:        /* Invalid PPP packet. */
 709           invalid:
 710                 if (debug)
 711                         log(LOG_DEBUG,
 712                             SPP_FMT "invalid input packet "
 713                             "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 714                             SPP_ARGS(ifp),
 715                             h->address, h->control, ntohs(h->protocol));
 716                 goto drop;
 717         }
 718
 719         if (! (ifp->if_flags & IFF_UP) || isr == -1)
 720                 goto drop;
 721
 722         SPPP_UNLOCK(sp);
 723         M_SETFIB(m, ifp->if_fib);
 724         /* Check queue. */
 725         if (netisr_queue(isr, m)) {     /* (0) on success. */
 726                 if (debug)
 727                         log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n",
 728                                 SPP_ARGS(ifp));
 729                 goto drop2;
 730         }
 731
 732         if (do_account)
 733                 /*
 734                  * Do only account for network packets, not for control
 735                  * packets.  This is used by some subsystems to detect
 736                  * idle lines.
 737                  */
 738                 sp->pp_last_recv = time_uptime;
 739 }
 740
 741 static void
 742 sppp_ifstart_sched(void *dummy)
 743 {
 744         struct sppp *sp = dummy;
 745
 746         sp->if_start(SP2IFP(sp));
 747 }
 748
 749 /* if_start () wrapper function. We use it to schedule real if_start () for
 750  * execution. We can't call it directly
 751  */
 752 static void
 753 sppp_ifstart(struct ifnet *ifp)
 754 {
 755         struct sppp *sp = IFP2SP(ifp);
 756
 757         if (SPPP_LOCK_OWNED(sp)) {
 758                 if (callout_pending(&sp->ifstart_callout))
 759                         return;
 760                 callout_reset(&sp->ifstart_callout, 1, sppp_ifstart_sched,
 761                     (void *)sp);
 762         } else {
 763                 sp->if_start(ifp);
 764         }
 765 }
 766
 767 /*
 768  * Enqueue transmit packet.
 769  */
 770 static int
 771 sppp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
 772         struct route *ro)
 773 {
 774         struct sppp *sp = IFP2SP(ifp);
 775         struct ppp_header *h;
 776         struct ifqueue *ifq = NULL;
 777         int error, rv = 0;
 778 #ifdef INET
 779         int ipproto = PPP_IP;
 780 #endif
 781         int debug = ifp->if_flags & IFF_DEBUG;
 782
 783         SPPP_LOCK(sp);
 784
 785         if (!(ifp->if_flags & IFF_UP) ||
 786             (!(ifp->if_flags & IFF_AUTO) &&
 787             !(ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 788 #ifdef INET6
 789           drop:
 790 #endif
 791                 m_freem (m);
 792                 SPPP_UNLOCK(sp);
 793                 return (ENETDOWN);
 794         }
 795
 796         if ((ifp->if_flags & IFF_AUTO) &&
 797             !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 798 #ifdef INET6
 799                 /*
 800                  * XXX
 801                  *
 802                  * Hack to prevent the initialization-time generated
 803                  * IPv6 multicast packet to erroneously cause a
 804                  * dialout event in case IPv6 has been
 805                  * administratively disabled on that interface.
 806                  */
 807                 if (dst->sa_family == AF_INET6 &&
 808                     !(sp->confflags & CONF_ENABLE_IPV6))
 809                         goto drop;
 810 #endif
 811                 /*
 812                  * Interface is not yet running, but auto-dial.  Need
 813                  * to start LCP for it.
 814                  */
 815                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 816                 lcp.Open(sp);
 817         }
 818
 819 #ifdef INET
 820         if (dst->sa_family == AF_INET) {
 821                 /* XXX Check mbuf length here? */
 822                 struct ip *ip = mtod (m, struct ip*);
 823                 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
 824
 825                 /*
 826                  * When using dynamic local IP address assignment by using
 827                  * 0.0.0.0 as a local address, the first TCP session will
 828                  * not connect because the local TCP checksum is computed
 829                  * using 0.0.0.0 which will later become our real IP address
 830                  * so the TCP checksum computed at the remote end will
 831                  * become invalid. So we
 832                  * - don't let packets with src ip addr 0 thru
 833                  * - we flag TCP packets with src ip 0 as an error
 834                  */
 835
 836                 if(ip->ip_src.s_addr == INADDR_ANY)     /* -hm */
 837                 {
 838                         m_freem(m);
 839                         SPPP_UNLOCK(sp);
 840                         if(ip->ip_p == IPPROTO_TCP)
 841                                 return(EADDRNOTAVAIL);
 842                         else
 843                                 return(0);
 844                 }
 845
 846                 /*
 847                  * Put low delay, telnet, rlogin and ftp control packets
 848                  * in front of the queue or let ALTQ take care.
 849                  */
 850                 if (ALTQ_IS_ENABLED(&ifp->if_snd))
 851                         ;
 852                 else if (_IF_QFULL(&sp->pp_fastq))
 853                         ;
 854                 else if (ip->ip_tos & IPTOS_LOWDELAY)
 855                         ifq = &sp->pp_fastq;
 856                 else if (m->m_len < sizeof *ip + sizeof *tcp)
 857                         ;
 858                 else if (ip->ip_p != IPPROTO_TCP)
 859                         ;
 860                 else if (INTERACTIVE (ntohs (tcp->th_sport)))
 861                         ifq = &sp->pp_fastq;
 862                 else if (INTERACTIVE (ntohs (tcp->th_dport)))
 863                         ifq = &sp->pp_fastq;
 864
 865                 /*
 866                  * Do IP Header compression
 867                  */
 868                 if (sp->pp_mode != IFF_CISCO && sp->pp_mode != PP_FR &&
 869                     (sp->ipcp.flags & IPCP_VJ) && ip->ip_p == IPPROTO_TCP)
 870                         switch (sl_compress_tcp(m, ip, sp->pp_comp,
 871                                                 sp->ipcp.compress_cid)) {
 872                         case TYPE_COMPRESSED_TCP:
 873                                 ipproto = PPP_VJ_COMP;
 874                                 break;
 875                         case TYPE_UNCOMPRESSED_TCP:
 876                                 ipproto = PPP_VJ_UCOMP;
 877                                 break;
 878                         case TYPE_IP:
 879                                 ipproto = PPP_IP;
 880                                 break;
 881                         default:
 882                                 m_freem(m);
 883                                 SPPP_UNLOCK(sp);
 884                                 return (EINVAL);
 885                         }
 886         }
 887 #endif
 888
 889 #ifdef INET6
 890         if (dst->sa_family == AF_INET6) {
 891                 /* XXX do something tricky here? */
 892         }
 893 #endif
 894
 895         if (sp->pp_mode == PP_FR) {
 896                 /* Add frame relay header. */
 897                 m = sppp_fr_header (sp, m, dst->sa_family);
 898                 if (! m)
 899                         goto nobufs;
 900                 goto out;
 901         }
 902
 903         /*
 904          * Prepend general data packet PPP header. For now, IP only.
 905          */
 906         M_PREPEND (m, PPP_HEADER_LEN, M_NOWAIT);
 907         if (! m) {
 908 nobufs:         if (debug)
 909                         log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
 910                                 SPP_ARGS(ifp));
 911                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
 912                 SPPP_UNLOCK(sp);
 913                 return (ENOBUFS);
 914         }
 915         /*
 916          * May want to check size of packet
 917          * (albeit due to the implementation it's always enough)
 918          */
 919         h = mtod (m, struct ppp_header*);
 920         if (sp->pp_mode == IFF_CISCO) {
 921                 h->address = CISCO_UNICAST;        /* unicast address */
 922                 h->control = 0;
 923         } else {
 924                 h->address = PPP_ALLSTATIONS;        /* broadcast address */
 925                 h->control = PPP_UI;                 /* Unnumbered Info */
 926         }
 927
 928         switch (dst->sa_family) {
 929 #ifdef INET
 930         case AF_INET:   /* Internet Protocol */
 931                 if (sp->pp_mode == IFF_CISCO)
 932                         h->protocol = htons (ETHERTYPE_IP);
 933                 else {
 934                         /*
 935                          * Don't choke with an ENETDOWN early.  It's
 936                          * possible that we just started dialing out,
 937                          * so don't drop the packet immediately.  If
 938                          * we notice that we run out of buffer space
 939                          * below, we will however remember that we are
 940                          * not ready to carry IP packets, and return
 941                          * ENETDOWN, as opposed to ENOBUFS.
 942                          */
 943                         h->protocol = htons(ipproto);
 944                         if (sp->state[IDX_IPCP] != STATE_OPENED)
 945                                 rv = ENETDOWN;
 946                 }
 947                 break;
 948 #endif
 949 #ifdef INET6
 950         case AF_INET6:   /* Internet Protocol */
 951                 if (sp->pp_mode == IFF_CISCO)
 952                         h->protocol = htons (ETHERTYPE_IPV6);
 953                 else {
 954                         /*
 955                          * Don't choke with an ENETDOWN early.  It's
 956                          * possible that we just started dialing out,
 957                          * so don't drop the packet immediately.  If
 958                          * we notice that we run out of buffer space
 959                          * below, we will however remember that we are
 960                          * not ready to carry IP packets, and return
 961                          * ENETDOWN, as opposed to ENOBUFS.
 962                          */
 963                         h->protocol = htons(PPP_IPV6);
 964                         if (sp->state[IDX_IPV6CP] != STATE_OPENED)
 965                                 rv = ENETDOWN;
 966                 }
 967                 break;
 968 #endif
 969         default:
 970                 m_freem (m);
 971                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
 972                 SPPP_UNLOCK(sp);
 973                 return (EAFNOSUPPORT);
 974         }
 975
 976         /*
 977          * Queue message on interface, and start output if interface
 978          * not yet active.
 979          */
 980 out:
 981         if (ifq != NULL)
 982                 error = !(IF_HANDOFF_ADJ(ifq, m, ifp, 3));
 983         else
 984                 IFQ_HANDOFF_ADJ(ifp, m, 3, error);
 985         if (error) {
 986                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
 987                 SPPP_UNLOCK(sp);
 988                 return (rv? rv: ENOBUFS);
 989         }
 990         SPPP_UNLOCK(sp);
 991         /*
 992          * Unlike in sppp_input(), we can always bump the timestamp
 993          * here since sppp_output() is only called on behalf of
 994          * network-layer traffic; control-layer traffic is handled
 995          * by sppp_cp_send().
 996          */
 997         sp->pp_last_sent = time_uptime;
 998         return (0);
 999 }
1000
1001 void
1002 sppp_attach(struct ifnet *ifp)
1003 {
1004         struct sppp *sp = IFP2SP(ifp);
1005
1006         /* Initialize mtx lock */
1007         mtx_init(&sp->mtx, "sppp", MTX_NETWORK_LOCK, MTX_DEF | MTX_RECURSE);
1008
1009         /* Initialize keepalive handler. */
1010         callout_init(&sp->keepalive_callout, 1);
1011         callout_reset(&sp->keepalive_callout, hz * 10, sppp_keepalive,
1012                     (void *)sp);
1013
1014         ifp->if_mtu = PP_MTU;
1015         ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
1016         ifp->if_output = sppp_output;
1017 #if 0
1018         sp->pp_flags = PP_KEEPALIVE;
1019 #endif
1020         ifp->if_snd.ifq_maxlen = 32;
1021         sp->pp_fastq.ifq_maxlen = 32;
1022         sp->pp_cpq.ifq_maxlen = 20;
1023         sp->pp_loopcnt = 0;
1024         sp->pp_alivecnt = 0;
1025         bzero(&sp->pp_seq[0], sizeof(sp->pp_seq));
1026         bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq));
1027         sp->pp_phase = PHASE_DEAD;
1028         sp->pp_up = sppp_pp_up;
1029         sp->pp_down = sppp_pp_down;
1030         if(!mtx_initialized(&sp->pp_cpq.ifq_mtx))
1031                 mtx_init(&sp->pp_cpq.ifq_mtx, "sppp_cpq", NULL, MTX_DEF);
1032         if(!mtx_initialized(&sp->pp_fastq.ifq_mtx))
1033                 mtx_init(&sp->pp_fastq.ifq_mtx, "sppp_fastq", NULL, MTX_DEF);
1034         sp->pp_last_recv = sp->pp_last_sent = time_uptime;
1035         sp->confflags = 0;
1036 #ifdef INET
1037         sp->confflags |= CONF_ENABLE_VJ;
1038 #endif
1039 #ifdef INET6
1040         sp->confflags |= CONF_ENABLE_IPV6;
1041 #endif
1042         callout_init(&sp->ifstart_callout, 1);
1043         sp->if_start = ifp->if_start;
1044         ifp->if_start = sppp_ifstart;
1045         sp->pp_comp = malloc(sizeof(struct slcompress), M_TEMP, M_WAITOK);
1046         sl_compress_init(sp->pp_comp, -1);
1047         sppp_lcp_init(sp);
1048         sppp_ipcp_init(sp);
1049         sppp_ipv6cp_init(sp);
1050         sppp_pap_init(sp);
1051         sppp_chap_init(sp);
1052 }
1053
1054 void
1055 sppp_detach(struct ifnet *ifp)
1056 {
1057         struct sppp *sp = IFP2SP(ifp);
1058         int i;
1059
1060         KASSERT(mtx_initialized(&sp->mtx), ("sppp mutex is not initialized"));
1061
1062         /* Stop keepalive handler. */
1063         callout_drain(&sp->keepalive_callout);
1064
1065         for (i = 0; i < IDX_COUNT; i++) {
1066                 callout_drain(&sp->ch[i]);
1067         }
1068         callout_drain(&sp->pap_my_to_ch);
1069
1070         mtx_destroy(&sp->pp_cpq.ifq_mtx);
1071         mtx_destroy(&sp->pp_fastq.ifq_mtx);
1072         mtx_destroy(&sp->mtx);
1073 }
1074
1075 /*
1076  * Flush the interface output queue.
1077  */
1078 static void
1079 sppp_flush_unlocked(struct ifnet *ifp)
1080 {
1081         struct sppp *sp = IFP2SP(ifp);
1082
1083         sppp_qflush ((struct ifqueue *)&SP2IFP(sp)->if_snd);
1084         sppp_qflush (&sp->pp_fastq);
1085         sppp_qflush (&sp->pp_cpq);
1086 }
1087
1088 void
1089 sppp_flush(struct ifnet *ifp)
1090 {
1091         struct sppp *sp = IFP2SP(ifp);
1092
1093         SPPP_LOCK(sp);
1094         sppp_flush_unlocked (ifp);
1095         SPPP_UNLOCK(sp);
1096 }
1097
1098 /*
1099  * Check if the output queue is empty.
1100  */
1101 int
1102 sppp_isempty(struct ifnet *ifp)
1103 {
1104         struct sppp *sp = IFP2SP(ifp);
1105         int empty;
1106
1107         SPPP_LOCK(sp);
1108         empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head &&
1109                 !SP2IFP(sp)->if_snd.ifq_head;
1110         SPPP_UNLOCK(sp);
1111         return (empty);
1112 }
1113
1114 /*
1115  * Get next packet to send.
1116  */
1117 struct mbuf *
1118 sppp_dequeue(struct ifnet *ifp)
1119 {
1120         struct sppp *sp = IFP2SP(ifp);
1121         struct mbuf *m;
1122
1123         SPPP_LOCK(sp);
1124         /*
1125          * Process only the control protocol queue until we have at
1126          * least one NCP open.
1127          *
1128          * Do always serve all three queues in Cisco mode.
1129          */
1130         IF_DEQUEUE(&sp->pp_cpq, m);
1131         if (m == NULL &&
1132             (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO ||
1133              sp->pp_mode == PP_FR)) {
1134                 IF_DEQUEUE(&sp->pp_fastq, m);
1135                 if (m == NULL)
1136                         IF_DEQUEUE (&SP2IFP(sp)->if_snd, m);
1137         }
1138         SPPP_UNLOCK(sp);
1139         return m;
1140 }
1141
1142 /*
1143  * Pick the next packet, do not remove it from the queue.
1144  */
1145 struct mbuf *
1146 sppp_pick(struct ifnet *ifp)
1147 {
1148         struct sppp *sp = IFP2SP(ifp);
1149         struct mbuf *m;
1150
1151         SPPP_LOCK(sp);
1152
1153         m = sp->pp_cpq.ifq_head;
1154         if (m == NULL &&
1155             (sp->pp_phase == PHASE_NETWORK ||
1156              sp->pp_mode == IFF_CISCO ||
1157              sp->pp_mode == PP_FR))
1158                 if ((m = sp->pp_fastq.ifq_head) == NULL)
1159                         m = SP2IFP(sp)->if_snd.ifq_head;
1160         SPPP_UNLOCK(sp);
1161         return (m);
1162 }
1163
1164 /*
1165  * Process an ioctl request.  Called on low priority level.
1166  */
1167 int
1168 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
1169 {
1170         struct ifreq *ifr = (struct ifreq*) data;
1171         struct sppp *sp = IFP2SP(ifp);
1172         int rv, going_up, going_down, newmode;
1173
1174         SPPP_LOCK(sp);
1175         rv = 0;
1176         switch (cmd) {
1177         case SIOCAIFADDR:
1178                 break;
1179
1180         case SIOCSIFADDR:
1181                 /* set the interface "up" when assigning an IP address */
1182                 ifp->if_flags |= IFF_UP;
1183                 /* FALLTHROUGH */
1184
1185         case SIOCSIFFLAGS:
1186                 going_up = ifp->if_flags & IFF_UP &&
1187                         (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0;
1188                 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1189                         ifp->if_drv_flags & IFF_DRV_RUNNING;
1190
1191                 newmode = ifp->if_flags & IFF_PASSIVE;
1192                 if (!newmode)
1193                         newmode = ifp->if_flags & IFF_AUTO;
1194                 if (!newmode)
1195                         newmode = ifp->if_flags & IFF_CISCO;
1196                 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
1197                 ifp->if_flags |= newmode;
1198
1199                 if (!newmode)
1200                         newmode = sp->pp_flags & PP_FR;
1201
1202                 if (newmode != sp->pp_mode) {
1203                         going_down = 1;
1204                         if (!going_up)
1205                                 going_up = ifp->if_drv_flags & IFF_DRV_RUNNING;
1206                 }
1207
1208                 if (going_down) {
1209                         if (sp->pp_mode != IFF_CISCO &&
1210                             sp->pp_mode != PP_FR)
1211                                 lcp.Close(sp);
1212                         else if (sp->pp_tlf)
1213                                 (sp->pp_tlf)(sp);
1214                         sppp_flush_unlocked(ifp);
1215                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1216                         sp->pp_mode = newmode;
1217                 }
1218
1219                 if (going_up) {
1220                         if (sp->pp_mode != IFF_CISCO &&
1221                             sp->pp_mode != PP_FR)
1222                                 lcp.Close(sp);
1223                         sp->pp_mode = newmode;
1224                         if (sp->pp_mode == 0) {
1225                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1226                                 lcp.Open(sp);
1227                         }
1228                         if ((sp->pp_mode == IFF_CISCO) ||
1229                             (sp->pp_mode == PP_FR)) {
1230                                 if (sp->pp_tls)
1231                                         (sp->pp_tls)(sp);
1232                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1233                         }
1234                 }
1235
1236                 break;
1237
1238 #ifdef SIOCSIFMTU
1239 #ifndef ifr_mtu
1240 #define ifr_mtu ifr_metric
1241 #endif
1242         case SIOCSIFMTU:
1243                 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
1244                         return (EINVAL);
1245                 ifp->if_mtu = ifr->ifr_mtu;
1246                 break;
1247 #endif
1248 #ifdef SLIOCSETMTU
1249         case SLIOCSETMTU:
1250                 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
1251                         return (EINVAL);
1252                 ifp->if_mtu = *(short*)data;
1253                 break;
1254 #endif
1255 #ifdef SIOCGIFMTU
1256         case SIOCGIFMTU:
1257                 ifr->ifr_mtu = ifp->if_mtu;
1258                 break;
1259 #endif
1260 #ifdef SLIOCGETMTU
1261         case SLIOCGETMTU:
1262                 *(short*)data = ifp->if_mtu;
1263                 break;
1264 #endif
1265         case SIOCADDMULTI:
1266         case SIOCDELMULTI:
1267                 break;
1268
1269         case SIOCGIFGENERIC:
1270         case SIOCSIFGENERIC:
1271                 rv = sppp_params(sp, cmd, data);
1272                 break;
1273
1274         default:
1275                 rv = ENOTTY;
1276         }
1277         SPPP_UNLOCK(sp);
1278         return rv;
1279 }
1280
1281 /*
1282  * Cisco framing implementation.
1283  */
1284
1285 /*
1286  * Handle incoming Cisco keepalive protocol packets.
1287  */
1288 static void
1289 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1290 {
1291         STDDCL;
1292         struct cisco_packet *h;
1293         u_long me, mymask;
1294
1295         if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1296                 if (debug)
1297                         log(LOG_DEBUG,
1298                             SPP_FMT "cisco invalid packet length: %d bytes\n",
1299                             SPP_ARGS(ifp), m->m_pkthdr.len);
1300                 return;
1301         }
1302         h = mtod (m, struct cisco_packet*);
1303         if (debug)
1304                 log(LOG_DEBUG,
1305                     SPP_FMT "cisco input: %d bytes "
1306                     "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1307                     SPP_ARGS(ifp), m->m_pkthdr.len,
1308                     (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
1309                     (u_int)h->time0, (u_int)h->time1);
1310         switch (ntohl (h->type)) {
1311         default:
1312                 if (debug)
1313                         log(-1, SPP_FMT "cisco unknown packet type: 0x%lx\n",
1314                                SPP_ARGS(ifp), (u_long)ntohl (h->type));
1315                 break;
1316         case CISCO_ADDR_REPLY:
1317                 /* Reply on address request, ignore */
1318                 break;
1319         case CISCO_KEEPALIVE_REQ:
1320                 sp->pp_alivecnt = 0;
1321                 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
1322                 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1323                         /* Local and remote sequence numbers are equal.
1324                          * Probably, the line is in loopback mode. */
1325                         if (sp->pp_loopcnt >= MAXALIVECNT) {
1326                                 printf (SPP_FMT "loopback\n",
1327                                         SPP_ARGS(ifp));
1328                                 sp->pp_loopcnt = 0;
1329                                 if (ifp->if_flags & IFF_UP) {
1330                                         if_down (ifp);
1331                                         sppp_qflush (&sp->pp_cpq);
1332                                 }
1333                         }
1334                         ++sp->pp_loopcnt;
1335
1336                         /* Generate new local sequence number */
1337                         sp->pp_seq[IDX_LCP] = random();
1338                         break;
1339                 }
1340                 sp->pp_loopcnt = 0;
1341                 if (! (ifp->if_flags & IFF_UP) &&
1342                     (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
1343                         if_up(ifp);
1344                         printf (SPP_FMT "up\n", SPP_ARGS(ifp));
1345                 }
1346                 break;
1347         case CISCO_ADDR_REQ:
1348                 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1349                 if (me != 0L)
1350                         sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1351                 break;
1352         }
1353 }
1354
1355 /*
1356  * Send Cisco keepalive packet.
1357  */
1358 static void
1359 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1360 {
1361         STDDCL;
1362         struct ppp_header *h;
1363         struct cisco_packet *ch;
1364         struct mbuf *m;
1365         struct timeval tv;
1366
1367         getmicrouptime(&tv);
1368
1369         MGETHDR (m, M_NOWAIT, MT_DATA);
1370         if (! m)
1371                 return;
1372         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1373         m->m_pkthdr.rcvif = 0;
1374
1375         h = mtod (m, struct ppp_header*);
1376         h->address = CISCO_MULTICAST;
1377         h->control = 0;
1378         h->protocol = htons (CISCO_KEEPALIVE);
1379
1380         ch = (struct cisco_packet*) (h + 1);
1381         ch->type = htonl (type);
1382         ch->par1 = htonl (par1);
1383         ch->par2 = htonl (par2);
1384         ch->rel = -1;
1385
1386         ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1387         ch->time1 = htons ((u_short) tv.tv_sec);
1388
1389         if (debug)
1390                 log(LOG_DEBUG,
1391                     SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1392                         SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
1393                         (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1394
1395         if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
1396                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1397 }
1398
1399 /*
1400  * PPP protocol implementation.
1401  */
1402
1403 /*
1404  * Send PPP control protocol packet.
1405  */
1406 static void
1407 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1408              u_char ident, u_short len, void *data)
1409 {
1410         STDDCL;
1411         struct ppp_header *h;
1412         struct lcp_header *lh;
1413         struct mbuf *m;
1414
1415         if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1416                 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1417         MGETHDR (m, M_NOWAIT, MT_DATA);
1418         if (! m)
1419                 return;
1420         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1421         m->m_pkthdr.rcvif = 0;
1422
1423         h = mtod (m, struct ppp_header*);
1424         h->address = PPP_ALLSTATIONS;        /* broadcast address */
1425         h->control = PPP_UI;                 /* Unnumbered Info */
1426         h->protocol = htons (proto);         /* Link Control Protocol */
1427
1428         lh = (struct lcp_header*) (h + 1);
1429         lh->type = type;
1430         lh->ident = ident;
1431         lh->len = htons (LCP_HEADER_LEN + len);
1432         if (len)
1433                 bcopy (data, lh+1, len);
1434
1435         if (debug) {
1436                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1437                     SPP_ARGS(ifp),
1438                     sppp_proto_name(proto),
1439                     sppp_cp_type_name (lh->type), lh->ident,
1440                     ntohs (lh->len));
1441                 sppp_print_bytes ((u_char*) (lh+1), len);
1442                 log(-1, ">\n");
1443         }
1444         if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
1445                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1446 }
1447
1448 /*
1449  * Handle incoming PPP control protocol packets.
1450  */
1451 static void
1452 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1453 {
1454         STDDCL;
1455         struct lcp_header *h;
1456         int len = m->m_pkthdr.len;
1457         int rv;
1458         u_char *p;
1459
1460         if (len < 4) {
1461                 if (debug)
1462                         log(LOG_DEBUG,
1463                             SPP_FMT "%s invalid packet length: %d bytes\n",
1464                             SPP_ARGS(ifp), cp->name, len);
1465                 return;
1466         }
1467         h = mtod (m, struct lcp_header*);
1468         if (debug) {
1469                 log(LOG_DEBUG,
1470                     SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1471                     SPP_ARGS(ifp), cp->name,
1472                     sppp_state_name(sp->state[cp->protoidx]),
1473                     sppp_cp_type_name (h->type), h->ident, ntohs (h->len));
1474                 sppp_print_bytes ((u_char*) (h+1), len-4);
1475                 log(-1, ">\n");
1476         }
1477         if (len > ntohs (h->len))
1478                 len = ntohs (h->len);
1479         p = (u_char *)(h + 1);
1480         switch (h->type) {
1481         case CONF_REQ:
1482                 if (len < 4) {
1483                         if (debug)
1484                                 log(-1, SPP_FMT "%s invalid conf-req length %d\n",
1485                                        SPP_ARGS(ifp), cp->name,
1486                                        len);
1487                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1488                         break;
1489                 }
1490                 /* handle states where RCR doesn't get a SCA/SCN */
1491                 switch (sp->state[cp->protoidx]) {
1492                 case STATE_CLOSING:
1493                 case STATE_STOPPING:
1494                         return;
1495                 case STATE_CLOSED:
1496                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1497                                      0, 0);
1498                         return;
1499                 }
1500                 rv = (cp->RCR)(sp, h, len);
1501                 switch (sp->state[cp->protoidx]) {
1502                 case STATE_OPENED:
1503                         (cp->tld)(sp);
1504                         (cp->scr)(sp);
1505                         /* FALLTHROUGH */
1506                 case STATE_ACK_SENT:
1507                 case STATE_REQ_SENT:
1508                         /*
1509                          * sppp_cp_change_state() have the side effect of
1510                          * restarting the timeouts. We want to avoid that
1511                          * if the state don't change, otherwise we won't
1512                          * ever timeout and resend a configuration request
1513                          * that got lost.
1514                          */
1515                         if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
1516                             STATE_REQ_SENT))
1517                                 break;
1518                         sppp_cp_change_state(cp, sp, rv?
1519                                              STATE_ACK_SENT: STATE_REQ_SENT);
1520                         break;
1521                 case STATE_STOPPED:
1522                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1523                         (cp->scr)(sp);
1524                         sppp_cp_change_state(cp, sp, rv?
1525                                              STATE_ACK_SENT: STATE_REQ_SENT);
1526                         break;
1527                 case STATE_ACK_RCVD:
1528                         if (rv) {
1529                                 sppp_cp_change_state(cp, sp, STATE_OPENED);
1530                                 if (debug)
1531                                         log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1532                                             SPP_ARGS(ifp),
1533                                             cp->name);
1534                                 (cp->tlu)(sp);
1535                         } else
1536                                 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1537                         break;
1538                 default:
1539                         printf(SPP_FMT "%s illegal %s in state %s\n",
1540                                SPP_ARGS(ifp), cp->name,
1541                                sppp_cp_type_name(h->type),
1542                                sppp_state_name(sp->state[cp->protoidx]));
1543                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1544                 }
1545                 break;
1546         case CONF_ACK:
1547                 if (h->ident != sp->confid[cp->protoidx]) {
1548                         if (debug)
1549                                 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1550                                        SPP_ARGS(ifp), cp->name,
1551                                        h->ident, sp->confid[cp->protoidx]);
1552                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1553                         break;
1554                 }
1555                 switch (sp->state[cp->protoidx]) {
1556                 case STATE_CLOSED:
1557                 case STATE_STOPPED:
1558                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1559                         break;
1560                 case STATE_CLOSING:
1561                 case STATE_STOPPING:
1562                         break;
1563                 case STATE_REQ_SENT:
1564                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1565                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1566                         break;
1567                 case STATE_OPENED:
1568                         (cp->tld)(sp);
1569                         /* FALLTHROUGH */
1570                 case STATE_ACK_RCVD:
1571                         (cp->scr)(sp);
1572                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1573                         break;
1574                 case STATE_ACK_SENT:
1575                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1576                         sppp_cp_change_state(cp, sp, STATE_OPENED);
1577                         if (debug)
1578                                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1579                                        SPP_ARGS(ifp), cp->name);
1580                         (cp->tlu)(sp);
1581                         break;
1582                 default:
1583                         printf(SPP_FMT "%s illegal %s in state %s\n",
1584                                SPP_ARGS(ifp), cp->name,
1585                                sppp_cp_type_name(h->type),
1586                                sppp_state_name(sp->state[cp->protoidx]));
1587                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1588                 }
1589                 break;
1590         case CONF_NAK:
1591         case CONF_REJ:
1592                 if (h->ident != sp->confid[cp->protoidx]) {
1593                         if (debug)
1594                                 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1595                                        SPP_ARGS(ifp), cp->name,
1596                                        h->ident, sp->confid[cp->protoidx]);
1597                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1598                         break;
1599                 }
1600                 if (h->type == CONF_NAK)
1601                         (cp->RCN_nak)(sp, h, len);
1602                 else /* CONF_REJ */
1603                         (cp->RCN_rej)(sp, h, len);
1604
1605                 switch (sp->state[cp->protoidx]) {
1606                 case STATE_CLOSED:
1607                 case STATE_STOPPED:
1608                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1609                         break;
1610                 case STATE_REQ_SENT:
1611                 case STATE_ACK_SENT:
1612                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1613                         /*
1614                          * Slow things down a bit if we think we might be
1615                          * in loopback. Depend on the timeout to send the
1616                          * next configuration request.
1617                          */
1618                         if (sp->pp_loopcnt)
1619                                 break;
1620                         (cp->scr)(sp);
1621                         break;
1622                 case STATE_OPENED:
1623                         (cp->tld)(sp);
1624                         /* FALLTHROUGH */
1625                 case STATE_ACK_RCVD:
1626                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1627                         (cp->scr)(sp);
1628                         break;
1629                 case STATE_CLOSING:
1630                 case STATE_STOPPING:
1631                         break;
1632                 default:
1633                         printf(SPP_FMT "%s illegal %s in state %s\n",
1634                                SPP_ARGS(ifp), cp->name,
1635                                sppp_cp_type_name(h->type),
1636                                sppp_state_name(sp->state[cp->protoidx]));
1637                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1638                 }
1639                 break;
1640
1641         case TERM_REQ:
1642                 switch (sp->state[cp->protoidx]) {
1643                 case STATE_ACK_RCVD:
1644                 case STATE_ACK_SENT:
1645                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1646                         /* FALLTHROUGH */
1647                 case STATE_CLOSED:
1648                 case STATE_STOPPED:
1649                 case STATE_CLOSING:
1650                 case STATE_STOPPING:
1651                 case STATE_REQ_SENT:
1652                   sta:
1653                         /* Send Terminate-Ack packet. */
1654                         if (debug)
1655                                 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1656                                     SPP_ARGS(ifp), cp->name);
1657                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1658                         break;
1659                 case STATE_OPENED:
1660                         (cp->tld)(sp);
1661                         sp->rst_counter[cp->protoidx] = 0;
1662                         sppp_cp_change_state(cp, sp, STATE_STOPPING);
1663                         goto sta;
1664                         break;
1665                 default:
1666                         printf(SPP_FMT "%s illegal %s in state %s\n",
1667                                SPP_ARGS(ifp), cp->name,
1668                                sppp_cp_type_name(h->type),
1669                                sppp_state_name(sp->state[cp->protoidx]));
1670                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1671                 }
1672                 break;
1673         case TERM_ACK:
1674                 switch (sp->state[cp->protoidx]) {
1675                 case STATE_CLOSED:
1676                 case STATE_STOPPED:
1677                 case STATE_REQ_SENT:
1678                 case STATE_ACK_SENT:
1679                         break;
1680                 case STATE_CLOSING:
1681                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
1682                         (cp->tlf)(sp);
1683                         break;
1684                 case STATE_STOPPING:
1685                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
1686                         (cp->tlf)(sp);
1687                         break;
1688                 case STATE_ACK_RCVD:
1689                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1690                         break;
1691                 case STATE_OPENED:
1692                         (cp->tld)(sp);
1693                         (cp->scr)(sp);
1694                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1695                         break;
1696                 default:
1697                         printf(SPP_FMT "%s illegal %s in state %s\n",
1698                                SPP_ARGS(ifp), cp->name,
1699                                sppp_cp_type_name(h->type),
1700                                sppp_state_name(sp->state[cp->protoidx]));
1701                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1702                 }
1703                 break;
1704         case CODE_REJ:
1705                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1706                 log(LOG_INFO,
1707                     SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1708                     "danger will robinson\n",
1709                     SPP_ARGS(ifp), cp->name,
1710                     sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1711                 switch (sp->state[cp->protoidx]) {
1712                 case STATE_CLOSED:
1713                 case STATE_STOPPED:
1714                 case STATE_REQ_SENT:
1715                 case STATE_ACK_SENT:
1716                 case STATE_CLOSING:
1717                 case STATE_STOPPING:
1718                 case STATE_OPENED:
1719                         break;
1720                 case STATE_ACK_RCVD:
1721                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1722                         break;
1723                 default:
1724                         printf(SPP_FMT "%s illegal %s in state %s\n",
1725                                SPP_ARGS(ifp), cp->name,
1726                                sppp_cp_type_name(h->type),
1727                                sppp_state_name(sp->state[cp->protoidx]));
1728                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1729                 }
1730                 break;
1731         case PROTO_REJ:
1732             {
1733                 int catastrophic;
1734                 const struct cp *upper;
1735                 int i;
1736                 u_int16_t proto;
1737
1738                 catastrophic = 0;
1739                 upper = NULL;
1740                 proto = ntohs(*((u_int16_t *)p));
1741                 for (i = 0; i < IDX_COUNT; i++) {
1742                         if (cps[i]->proto == proto) {
1743                                 upper = cps[i];
1744                                 break;
1745                         }
1746                 }
1747                 if (upper == NULL)
1748                         catastrophic++;
1749
1750                 if (catastrophic || debug)
1751                         log(catastrophic? LOG_INFO: LOG_DEBUG,
1752                             SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1753                             SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
1754                             sppp_cp_type_name(h->type), proto,
1755                             upper ? upper->name : "unknown",
1756                             upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1757
1758                 /*
1759                  * if we got RXJ+ against conf-req, the peer does not implement
1760                  * this particular protocol type.  terminate the protocol.
1761                  */
1762                 if (upper && !catastrophic) {
1763                         if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1764                                 upper->Close(sp);
1765                                 break;
1766                         }
1767                 }
1768
1769                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1770                 switch (sp->state[cp->protoidx]) {
1771                 case STATE_CLOSED:
1772                 case STATE_STOPPED:
1773                 case STATE_REQ_SENT:
1774                 case STATE_ACK_SENT:
1775                 case STATE_CLOSING:
1776                 case STATE_STOPPING:
1777                 case STATE_OPENED:
1778                         break;
1779                 case STATE_ACK_RCVD:
1780                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1781                         break;
1782                 default:
1783                         printf(SPP_FMT "%s illegal %s in state %s\n",
1784                                SPP_ARGS(ifp), cp->name,
1785                                sppp_cp_type_name(h->type),
1786                                sppp_state_name(sp->state[cp->protoidx]));
1787                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1788                 }
1789                 break;
1790             }
1791         case DISC_REQ:
1792                 if (cp->proto != PPP_LCP)
1793                         goto illegal;
1794                 /* Discard the packet. */
1795                 break;
1796         case ECHO_REQ:
1797                 if (cp->proto != PPP_LCP)
1798                         goto illegal;
1799                 if (sp->state[cp->protoidx] != STATE_OPENED) {
1800                         if (debug)
1801                                 log(-1, SPP_FMT "lcp echo req but lcp closed\n",
1802                                        SPP_ARGS(ifp));
1803                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1804                         break;
1805                 }
1806                 if (len < 8) {
1807                         if (debug)
1808                                 log(-1, SPP_FMT "invalid lcp echo request "
1809                                        "packet length: %d bytes\n",
1810                                        SPP_ARGS(ifp), len);
1811                         break;
1812                 }
1813                 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
1814                     ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1815                         /* Line loopback mode detected. */
1816                         printf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1817                         sp->pp_loopcnt = MAXALIVECNT * 5;
1818                         if_down (ifp);
1819                         sppp_qflush (&sp->pp_cpq);
1820
1821                         /* Shut down the PPP link. */
1822                         /* XXX */
1823                         lcp.Down(sp);
1824                         lcp.Up(sp);
1825                         break;
1826                 }
1827                 *(long*)(h+1) = htonl (sp->lcp.magic);
1828                 if (debug)
1829                         log(-1, SPP_FMT "got lcp echo req, sending echo rep\n",
1830                                SPP_ARGS(ifp));
1831                 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1832                 break;
1833         case ECHO_REPLY:
1834                 if (cp->proto != PPP_LCP)
1835                         goto illegal;
1836                 if (h->ident != sp->lcp.echoid) {
1837                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1838                         break;
1839                 }
1840                 if (len < 8) {
1841                         if (debug)
1842                                 log(-1, SPP_FMT "lcp invalid echo reply "
1843                                        "packet length: %d bytes\n",
1844                                        SPP_ARGS(ifp), len);
1845                         break;
1846                 }
1847                 if (debug)
1848                         log(-1, SPP_FMT "lcp got echo rep\n",
1849                                SPP_ARGS(ifp));
1850                 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
1851                     ntohl (*(long*)(h+1)) != sp->lcp.magic)
1852                         sp->pp_alivecnt = 0;
1853                 break;
1854         default:
1855                 /* Unknown packet type -- send Code-Reject packet. */
1856           illegal:
1857                 if (debug)
1858                         log(-1, SPP_FMT "%s send code-rej for 0x%x\n",
1859                                SPP_ARGS(ifp), cp->name, h->type);
1860                 sppp_cp_send(sp, cp->proto, CODE_REJ,
1861                              ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1862                 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1863         }
1864 }
1865
1866 /*
1867  * The generic part of all Up/Down/Open/Close/TO event handlers.
1868  * Basically, the state transition handling in the automaton.
1869  */
1870 static void
1871 sppp_up_event(const struct cp *cp, struct sppp *sp)
1872 {
1873         STDDCL;
1874
1875         if (debug)
1876                 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
1877                     SPP_ARGS(ifp), cp->name,
1878                     sppp_state_name(sp->state[cp->protoidx]));
1879
1880         switch (sp->state[cp->protoidx]) {
1881         case STATE_INITIAL:
1882                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1883                 break;
1884         case STATE_STARTING:
1885                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1886                 (cp->scr)(sp);
1887                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1888                 break;
1889         default:
1890                 printf(SPP_FMT "%s illegal up in state %s\n",
1891                        SPP_ARGS(ifp), cp->name,
1892                        sppp_state_name(sp->state[cp->protoidx]));
1893         }
1894 }
1895
1896 static void
1897 sppp_down_event(const struct cp *cp, struct sppp *sp)
1898 {
1899         STDDCL;
1900
1901         if (debug)
1902                 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
1903                     SPP_ARGS(ifp), cp->name,
1904                     sppp_state_name(sp->state[cp->protoidx]));
1905
1906         switch (sp->state[cp->protoidx]) {
1907         case STATE_CLOSED:
1908         case STATE_CLOSING:
1909                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1910                 break;
1911         case STATE_STOPPED:
1912                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1913                 (cp->tls)(sp);
1914                 break;
1915         case STATE_STOPPING:
1916         case STATE_REQ_SENT:
1917         case STATE_ACK_RCVD:
1918         case STATE_ACK_SENT:
1919                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1920                 break;
1921         case STATE_OPENED:
1922                 (cp->tld)(sp);
1923                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1924                 break;
1925         default:
1926                 printf(SPP_FMT "%s illegal down in state %s\n",
1927                        SPP_ARGS(ifp), cp->name,
1928                        sppp_state_name(sp->state[cp->protoidx]));
1929         }
1930 }
1931
1932 static void
1933 sppp_open_event(const struct cp *cp, struct sppp *sp)
1934 {
1935         STDDCL;
1936
1937         if (debug)
1938                 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1939                     SPP_ARGS(ifp), cp->name,
1940                     sppp_state_name(sp->state[cp->protoidx]));
1941
1942         switch (sp->state[cp->protoidx]) {
1943         case STATE_INITIAL:
1944                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1945                 (cp->tls)(sp);
1946                 break;
1947         case STATE_STARTING:
1948                 break;
1949         case STATE_CLOSED:
1950                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1951                 (cp->scr)(sp);
1952                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1953                 break;
1954         case STATE_STOPPED:
1955                 /*
1956                  * Try escaping stopped state.  This seems to bite
1957                  * people occasionally, in particular for IPCP,
1958                  * presumably following previous IPCP negotiation
1959                  * aborts.  Somehow, we must have missed a Down event
1960                  * which would have caused a transition into starting
1961                  * state, so as a bandaid we force the Down event now.
1962                  * This effectively implements (something like the)
1963                  * `restart' option mentioned in the state transition
1964                  * table of RFC 1661.
1965                  */
1966                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1967                 (cp->tls)(sp);
1968                 break;
1969         case STATE_STOPPING:
1970         case STATE_REQ_SENT:
1971         case STATE_ACK_RCVD:
1972         case STATE_ACK_SENT:
1973         case STATE_OPENED:
1974                 break;
1975         case STATE_CLOSING:
1976                 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1977                 break;
1978         }
1979 }
1980
1981 static void
1982 sppp_close_event(const struct cp *cp, struct sppp *sp)
1983 {
1984         STDDCL;
1985
1986         if (debug)
1987                 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
1988                     SPP_ARGS(ifp), cp->name,
1989                     sppp_state_name(sp->state[cp->protoidx]));
1990
1991         switch (sp->state[cp->protoidx]) {
1992         case STATE_INITIAL:
1993         case STATE_CLOSED:
1994         case STATE_CLOSING:
1995                 break;
1996         case STATE_STARTING:
1997                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1998                 (cp->tlf)(sp);
1999                 break;
2000         case STATE_STOPPED:
2001                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2002                 break;
2003         case STATE_STOPPING:
2004                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2005                 break;
2006         case STATE_OPENED:
2007                 (cp->tld)(sp);
2008                 /* FALLTHROUGH */
2009         case STATE_REQ_SENT:
2010         case STATE_ACK_RCVD:
2011         case STATE_ACK_SENT:
2012                 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
2013                 sppp_cp_send(sp, cp->proto, TERM_REQ,
2014                              ++sp->pp_seq[cp->protoidx], 0, 0);
2015                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2016                 break;
2017         }
2018 }
2019
2020 static void
2021 sppp_to_event(const struct cp *cp, struct sppp *sp)
2022 {
2023         STDDCL;
2024
2025         SPPP_LOCK(sp);
2026         if (debug)
2027                 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
2028                     SPP_ARGS(ifp), cp->name,
2029                     sppp_state_name(sp->state[cp->protoidx]),
2030                     sp->rst_counter[cp->protoidx]);
2031
2032         if (--sp->rst_counter[cp->protoidx] < 0)
2033                 /* TO- event */
2034                 switch (sp->state[cp->protoidx]) {
2035                 case STATE_CLOSING:
2036                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
2037                         (cp->tlf)(sp);
2038                         break;
2039                 case STATE_STOPPING:
2040                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2041                         (cp->tlf)(sp);
2042                         break;
2043                 case STATE_REQ_SENT:
2044                 case STATE_ACK_RCVD:
2045                 case STATE_ACK_SENT:
2046                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2047                         (cp->tlf)(sp);
2048                         break;
2049                 }
2050         else
2051                 /* TO+ event */
2052                 switch (sp->state[cp->protoidx]) {
2053                 case STATE_CLOSING:
2054                 case STATE_STOPPING:
2055                         sppp_cp_send(sp, cp->proto, TERM_REQ,
2056                                      ++sp->pp_seq[cp->protoidx], 0, 0);
2057                         callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2058                                       cp->TO, (void *)sp);
2059                         break;
2060                 case STATE_REQ_SENT:
2061                 case STATE_ACK_RCVD:
2062                         (cp->scr)(sp);
2063                         /* sppp_cp_change_state() will restart the timer */
2064                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
2065                         break;
2066                 case STATE_ACK_SENT:
2067                         (cp->scr)(sp);
2068                         callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2069                                       cp->TO, (void *)sp);
2070                         break;
2071                 }
2072
2073         SPPP_UNLOCK(sp);
2074 }
2075
2076 /*
2077  * Change the state of a control protocol in the state automaton.
2078  * Takes care of starting/stopping the restart timer.
2079  */
2080 static void
2081 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
2082 {
2083         sp->state[cp->protoidx] = newstate;
2084
2085         callout_stop (&sp->ch[cp->protoidx]);
2086
2087         switch (newstate) {
2088         case STATE_INITIAL:
2089         case STATE_STARTING:
2090         case STATE_CLOSED:
2091         case STATE_STOPPED:
2092         case STATE_OPENED:
2093                 break;
2094         case STATE_CLOSING:
2095         case STATE_STOPPING:
2096         case STATE_REQ_SENT:
2097         case STATE_ACK_RCVD:
2098         case STATE_ACK_SENT:
2099                 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2100                               cp->TO, (void *)sp);
2101                 break;
2102         }
2103 }
2104
2105 /*
2106  *--------------------------------------------------------------------------*
2107  *                                                                          *
2108  *                         The LCP implementation.                          *
2109  *                                                                          *
2110  *--------------------------------------------------------------------------*
2111  */
2112 static void
2113 sppp_pp_up(struct sppp *sp)
2114 {
2115         SPPP_LOCK(sp);
2116         lcp.Up(sp);
2117         SPPP_UNLOCK(sp);
2118 }
2119
2120 static void
2121 sppp_pp_down(struct sppp *sp)
2122 {
2123         SPPP_LOCK(sp);
2124         lcp.Down(sp);
2125         SPPP_UNLOCK(sp);
2126 }
2127
2128 static void
2129 sppp_lcp_init(struct sppp *sp)
2130 {
2131         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2132         sp->lcp.magic = 0;
2133         sp->state[IDX_LCP] = STATE_INITIAL;
2134         sp->fail_counter[IDX_LCP] = 0;
2135         sp->pp_seq[IDX_LCP] = 0;
2136         sp->pp_rseq[IDX_LCP] = 0;
2137         sp->lcp.protos = 0;
2138         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2139
2140         /* Note that these values are  relevant for all control protocols */
2141         sp->lcp.timeout = 3 * hz;
2142         sp->lcp.max_terminate = 2;
2143         sp->lcp.max_configure = 10;
2144         sp->lcp.max_failure = 10;
2145         callout_init(&sp->ch[IDX_LCP], 1);
2146 }
2147
2148 static void
2149 sppp_lcp_up(struct sppp *sp)
2150 {
2151         STDDCL;
2152
2153         sp->pp_alivecnt = 0;
2154         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2155         sp->lcp.magic = 0;
2156         sp->lcp.protos = 0;
2157         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2158         /*
2159          * If we are authenticator, negotiate LCP_AUTH
2160          */
2161         if (sp->hisauth.proto != 0)
2162                 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2163         else
2164                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2165         sp->pp_flags &= ~PP_NEEDAUTH;
2166         /*
2167          * If this interface is passive or dial-on-demand, and we are
2168          * still in Initial state, it means we've got an incoming
2169          * call.  Activate the interface.
2170          */
2171         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2172                 if (debug)
2173                         log(LOG_DEBUG,
2174                             SPP_FMT "Up event", SPP_ARGS(ifp));
2175                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
2176                 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2177                         if (debug)
2178                                 log(-1, "(incoming call)\n");
2179                         sp->pp_flags |= PP_CALLIN;
2180                         lcp.Open(sp);
2181                 } else if (debug)
2182                         log(-1, "\n");
2183         } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2184                    (sp->state[IDX_LCP] == STATE_INITIAL)) {
2185                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
2186                 lcp.Open(sp);
2187         }
2188
2189         sppp_up_event(&lcp, sp);
2190 }
2191
2192 static void
2193 sppp_lcp_down(struct sppp *sp)
2194 {
2195         STDDCL;
2196
2197         sppp_down_event(&lcp, sp);
2198
2199         /*
2200          * If this is neither a dial-on-demand nor a passive
2201          * interface, simulate an ``ifconfig down'' action, so the
2202          * administrator can force a redial by another ``ifconfig
2203          * up''.  XXX For leased line operation, should we immediately
2204          * try to reopen the connection here?
2205          */
2206         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2207                 log(LOG_INFO,
2208                     SPP_FMT "Down event, taking interface down.\n",
2209                     SPP_ARGS(ifp));
2210                 if_down(ifp);
2211         } else {
2212                 if (debug)
2213                         log(LOG_DEBUG,
2214                             SPP_FMT "Down event (carrier loss)\n",
2215                             SPP_ARGS(ifp));
2216                 sp->pp_flags &= ~PP_CALLIN;
2217                 if (sp->state[IDX_LCP] != STATE_INITIAL)
2218                         lcp.Close(sp);
2219                 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
2220         }
2221 }
2222
2223 static void
2224 sppp_lcp_open(struct sppp *sp)
2225 {
2226         sppp_open_event(&lcp, sp);
2227 }
2228
2229 static void
2230 sppp_lcp_close(struct sppp *sp)
2231 {
2232         sppp_close_event(&lcp, sp);
2233 }
2234
2235 static void
2236 sppp_lcp_TO(void *cookie)
2237 {
2238         sppp_to_event(&lcp, (struct sppp *)cookie);
2239 }
2240
2241 /*
2242  * Analyze a configure request.  Return true if it was agreeable, and
2243  * caused action sca, false if it has been rejected or nak'ed, and
2244  * caused action scn.  (The return value is used to make the state
2245  * transition decision in the state automaton.)
2246  */
2247 static int
2248 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2249 {
2250         STDDCL;
2251         u_char *buf, *r, *p;
2252         int origlen, rlen;
2253         u_long nmagic;
2254         u_short authproto;
2255
2256         len -= 4;
2257         origlen = len;
2258         buf = r = malloc (len, M_TEMP, M_NOWAIT);
2259         if (! buf)
2260                 return (0);
2261
2262         if (debug)
2263                 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
2264                     SPP_ARGS(ifp));
2265
2266         /* pass 1: check for things that need to be rejected */
2267         p = (void*) (h+1);
2268         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2269             len-=p[1], p+=p[1]) {
2270                 if (debug)
2271                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2272                 switch (*p) {
2273                 case LCP_OPT_MAGIC:
2274                         /* Magic number. */
2275                         if (len >= 6 && p[1] == 6)
2276                                 continue;
2277                         if (debug)
2278                                 log(-1, "[invalid] ");
2279                         break;
2280                 case LCP_OPT_ASYNC_MAP:
2281                         /* Async control character map. */
2282                         if (len >= 6 && p[1] == 6)
2283                                 continue;
2284                         if (debug)
2285                                 log(-1, "[invalid] ");
2286                         break;
2287                 case LCP_OPT_MRU:
2288                         /* Maximum receive unit. */
2289                         if (len >= 4 && p[1] == 4)
2290                                 continue;
2291                         if (debug)
2292                                 log(-1, "[invalid] ");
2293                         break;
2294                 case LCP_OPT_AUTH_PROTO:
2295                         if (len < 4) {
2296                                 if (debug)
2297                                         log(-1, "[invalid] ");
2298                                 break;
2299                         }
2300                         authproto = (p[2] << 8) + p[3];
2301                         if (authproto == PPP_CHAP && p[1] != 5) {
2302                                 if (debug)
2303                                         log(-1, "[invalid chap len] ");
2304                                 break;
2305                         }
2306                         if (sp->myauth.proto == 0) {
2307                                 /* we are not configured to do auth */
2308                                 if (debug)
2309                                         log(-1, "[not configured] ");
2310                                 break;
2311                         }
2312                         /*
2313                          * Remote want us to authenticate, remember this,
2314                          * so we stay in PHASE_AUTHENTICATE after LCP got
2315                          * up.
2316                          */
2317                         sp->pp_flags |= PP_NEEDAUTH;
2318                         continue;
2319                 default:
2320                         /* Others not supported. */
2321                         if (debug)
2322                                 log(-1, "[rej] ");
2323                         break;
2324                 }
2325                 /* Add the option to rejected list. */
2326                 bcopy (p, r, p[1]);
2327                 r += p[1];
2328                 rlen += p[1];
2329         }
2330         if (rlen) {
2331                 if (debug)
2332                         log(-1, " send conf-rej\n");
2333                 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2334                 return 0;
2335         } else if (debug)
2336                 log(-1, "\n");
2337
2338         /*
2339          * pass 2: check for option values that are unacceptable and
2340          * thus require to be nak'ed.
2341          */
2342         if (debug)
2343                 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2344                     SPP_ARGS(ifp));
2345
2346         p = (void*) (h+1);
2347         len = origlen;
2348         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2349             len-=p[1], p+=p[1]) {
2350                 if (debug)
2351                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2352                 switch (*p) {
2353                 case LCP_OPT_MAGIC:
2354                         /* Magic number -- extract. */
2355                         nmagic = (u_long)p[2] << 24 |
2356                                 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2357                         if (nmagic != sp->lcp.magic) {
2358                                 sp->pp_loopcnt = 0;
2359                                 if (debug)
2360                                         log(-1, "0x%lx ", nmagic);
2361                                 continue;
2362                         }
2363                         if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
2364                                 log(-1, "[glitch] ");
2365                         ++sp->pp_loopcnt;
2366                         /*
2367                          * We negate our magic here, and NAK it.  If
2368                          * we see it later in an NAK packet, we
2369                          * suggest a new one.
2370                          */
2371                         nmagic = ~sp->lcp.magic;
2372                         /* Gonna NAK it. */
2373                         p[2] = nmagic >> 24;
2374                         p[3] = nmagic >> 16;
2375                         p[4] = nmagic >> 8;
2376                         p[5] = nmagic;
2377                         break;
2378
2379                 case LCP_OPT_ASYNC_MAP:
2380                         /*
2381                          * Async control character map -- just ignore it.
2382                          *
2383                          * Quote from RFC 1662, chapter 6:
2384                          * To enable this functionality, synchronous PPP
2385                          * implementations MUST always respond to the
2386                          * Async-Control-Character-Map Configuration
2387                          * Option with the LCP Configure-Ack.  However,
2388                          * acceptance of the Configuration Option does
2389                          * not imply that the synchronous implementation
2390                          * will do any ACCM mapping.  Instead, all such
2391                          * octet mapping will be performed by the
2392                          * asynchronous-to-synchronous converter.
2393                          */
2394                         continue;
2395
2396                 case LCP_OPT_MRU:
2397                         /*
2398                          * Maximum receive unit.  Always agreeable,
2399                          * but ignored by now.
2400                          */
2401                         sp->lcp.their_mru = p[2] * 256 + p[3];
2402                         if (debug)
2403                                 log(-1, "%lu ", sp->lcp.their_mru);
2404                         continue;
2405
2406                 case LCP_OPT_AUTH_PROTO:
2407                         authproto = (p[2] << 8) + p[3];
2408                         if (sp->myauth.proto != authproto) {
2409                                 /* not agreed, nak */
2410                                 if (debug)
2411                                         log(-1, "[mine %s != his %s] ",
2412                                                sppp_proto_name(sp->hisauth.proto),
2413                                                sppp_proto_name(authproto));
2414                                 p[2] = sp->myauth.proto >> 8;
2415                                 p[3] = sp->myauth.proto;
2416                                 break;
2417                         }
2418                         if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2419                                 if (debug)
2420                                         log(-1, "[chap not MD5] ");
2421                                 p[4] = CHAP_MD5;
2422                                 break;
2423                         }
2424                         continue;
2425                 }
2426                 /* Add the option to nak'ed list. */
2427                 bcopy (p, r, p[1]);
2428                 r += p[1];
2429                 rlen += p[1];
2430         }
2431         if (rlen) {
2432                 /*
2433                  * Local and remote magics equal -- loopback?
2434                  */
2435                 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2436                         if (sp->pp_loopcnt == MAXALIVECNT*5)
2437                                 printf (SPP_FMT "loopback\n",
2438                                         SPP_ARGS(ifp));
2439                         if (ifp->if_flags & IFF_UP) {
2440                                 if_down(ifp);
2441                                 sppp_qflush(&sp->pp_cpq);
2442                                 /* XXX ? */
2443                                 lcp.Down(sp);
2444                                 lcp.Up(sp);
2445                         }
2446                 } else if (!sp->pp_loopcnt &&
2447                            ++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2448                         if (debug)
2449                                 log(-1, " max_failure (%d) exceeded, "
2450                                        "send conf-rej\n",
2451                                        sp->lcp.max_failure);
2452                         sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2453                 } else {
2454                         if (debug)
2455                                 log(-1, " send conf-nak\n");
2456                         sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2457                 }
2458         } else {
2459                 if (debug)
2460                         log(-1, " send conf-ack\n");
2461                 sp->fail_counter[IDX_LCP] = 0;
2462                 sp->pp_loopcnt = 0;
2463                 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2464                               h->ident, origlen, h+1);
2465         }
2466
2467         free (buf, M_TEMP);
2468         return (rlen == 0);
2469 }
2470
2471 /*
2472  * Analyze the LCP Configure-Reject option list, and adjust our
2473  * negotiation.
2474  */
2475 static void
2476 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2477 {
2478         STDDCL;
2479         u_char *buf, *p;
2480
2481         len -= 4;
2482         buf = malloc (len, M_TEMP, M_NOWAIT);
2483         if (!buf)
2484                 return;
2485
2486         if (debug)
2487                 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2488                     SPP_ARGS(ifp));
2489
2490         p = (void*) (h+1);
2491         for (; len >= 2 && p[1] >= 2 && len >= p[1];
2492             len -= p[1], p += p[1]) {
2493                 if (debug)
2494                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2495                 switch (*p) {
2496                 case LCP_OPT_MAGIC:
2497                         /* Magic number -- can't use it, use 0 */
2498                         sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2499                         sp->lcp.magic = 0;
2500                         break;
2501                 case LCP_OPT_MRU:
2502                         /*
2503                          * Should not be rejected anyway, since we only
2504                          * negotiate a MRU if explicitly requested by
2505                          * peer.
2506                          */
2507                         sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2508                         break;
2509                 case LCP_OPT_AUTH_PROTO:
2510                         /*
2511                          * Peer doesn't want to authenticate himself,
2512                          * deny unless this is a dialout call, and
2513                          * AUTHFLAG_NOCALLOUT is set.
2514                          */
2515                         if ((sp->pp_flags & PP_CALLIN) == 0 &&
2516                             (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2517                                 if (debug)
2518                                         log(-1, "[don't insist on auth "
2519                                                "for callout]");
2520                                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2521                                 break;
2522                         }
2523                         if (debug)
2524                                 log(-1, "[access denied]\n");
2525                         lcp.Close(sp);
2526                         break;
2527                 }
2528         }
2529         if (debug)
2530                 log(-1, "\n");
2531         free (buf, M_TEMP);
2532         return;
2533 }
2534
2535 /*
2536  * Analyze the LCP Configure-NAK option list, and adjust our
2537  * negotiation.
2538  */
2539 static void
2540 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2541 {
2542         STDDCL;
2543         u_char *buf, *p;
2544         u_long magic;
2545
2546         len -= 4;
2547         buf = malloc (len, M_TEMP, M_NOWAIT);
2548         if (!buf)
2549                 return;
2550
2551         if (debug)
2552                 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2553                     SPP_ARGS(ifp));
2554
2555         p = (void*) (h+1);
2556         for (; len >= 2 && p[1] >= 2 && len >= p[1];
2557             len -= p[1], p += p[1]) {
2558                 if (debug)
2559                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2560                 switch (*p) {
2561                 case LCP_OPT_MAGIC:
2562                         /* Magic number -- renegotiate */
2563                         if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2564                             len >= 6 && p[1] == 6) {
2565                                 magic = (u_long)p[2] << 24 |
2566                                         (u_long)p[3] << 16 | p[4] << 8 | p[5];
2567                                 /*
2568                                  * If the remote magic is our negated one,
2569                                  * this looks like a loopback problem.
2570                                  * Suggest a new magic to make sure.
2571                                  */
2572                                 if (magic == ~sp->lcp.magic) {
2573                                         if (debug)
2574                                                 log(-1, "magic glitch ");
2575                                         sp->lcp.magic = random();
2576                                 } else {
2577                                         sp->lcp.magic = magic;
2578                                         if (debug)
2579                                                 log(-1, "%lu ", magic);
2580                                 }
2581                         }
2582                         break;
2583                 case LCP_OPT_MRU:
2584                         /*
2585                          * Peer wants to advise us to negotiate an MRU.
2586                          * Agree on it if it's reasonable, or use
2587                          * default otherwise.
2588                          */
2589                         if (len >= 4 && p[1] == 4) {
2590                                 u_int mru = p[2] * 256 + p[3];
2591                                 if (debug)
2592                                         log(-1, "%d ", mru);
2593                                 if (mru < PP_MTU || mru > PP_MAX_MRU)
2594                                         mru = PP_MTU;
2595                                 sp->lcp.mru = mru;
2596                                 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2597                         }
2598                         break;
2599                 case LCP_OPT_AUTH_PROTO:
2600                         /*
2601                          * Peer doesn't like our authentication method,
2602                          * deny.
2603                          */
2604                         if (debug)
2605                                 log(-1, "[access denied]\n");
2606                         lcp.Close(sp);
2607                         break;
2608                 }
2609         }
2610         if (debug)
2611                 log(-1, "\n");
2612         free (buf, M_TEMP);
2613         return;
2614 }
2615
2616 static void
2617 sppp_lcp_tlu(struct sppp *sp)
2618 {
2619         STDDCL;
2620         int i;
2621         u_long mask;
2622
2623         /* XXX ? */
2624         if (! (ifp->if_flags & IFF_UP) &&
2625             (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
2626                 /* Coming out of loopback mode. */
2627                 if_up(ifp);
2628                 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
2629         }
2630
2631         for (i = 0; i < IDX_COUNT; i++)
2632                 if ((cps[i])->flags & CP_QUAL)
2633                         (cps[i])->Open(sp);
2634
2635         if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2636             (sp->pp_flags & PP_NEEDAUTH) != 0)
2637                 sp->pp_phase = PHASE_AUTHENTICATE;
2638         else
2639                 sp->pp_phase = PHASE_NETWORK;
2640
2641         if (debug)
2642                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2643                     sppp_phase_name(sp->pp_phase));
2644
2645         /*
2646          * Open all authentication protocols.  This is even required
2647          * if we already proceeded to network phase, since it might be
2648          * that remote wants us to authenticate, so we might have to
2649          * send a PAP request.  Undesired authentication protocols
2650          * don't do anything when they get an Open event.
2651          */
2652         for (i = 0; i < IDX_COUNT; i++)
2653                 if ((cps[i])->flags & CP_AUTH)
2654                         (cps[i])->Open(sp);
2655
2656         if (sp->pp_phase == PHASE_NETWORK) {
2657                 /* Notify all NCPs. */
2658                 for (i = 0; i < IDX_COUNT; i++)
2659                         if (((cps[i])->flags & CP_NCP) &&
2660                             /*
2661                              * XXX
2662                              * Hack to administratively disable IPv6 if
2663                              * not desired.  Perhaps we should have another
2664                              * flag for this, but right now, we can make
2665                              * all struct cp's read/only.
2666                              */
2667                             (cps[i] != &ipv6cp ||
2668                              (sp->confflags & CONF_ENABLE_IPV6)))
2669                                 (cps[i])->Open(sp);
2670         }
2671
2672         /* Send Up events to all started protos. */
2673         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2674                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2675                         (cps[i])->Up(sp);
2676
2677         /* notify low-level driver of state change */
2678         if (sp->pp_chg)
2679                 sp->pp_chg(sp, (int)sp->pp_phase);
2680
2681         if (sp->pp_phase == PHASE_NETWORK)
2682                 /* if no NCP is starting, close down */
2683                 sppp_lcp_check_and_close(sp);
2684 }
2685
2686 static void
2687 sppp_lcp_tld(struct sppp *sp)
2688 {
2689         STDDCL;
2690         int i;
2691         u_long mask;
2692
2693         sp->pp_phase = PHASE_TERMINATE;
2694
2695         if (debug)
2696                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2697                     sppp_phase_name(sp->pp_phase));
2698
2699         /*
2700          * Take upper layers down.  We send the Down event first and
2701          * the Close second to prevent the upper layers from sending
2702          * ``a flurry of terminate-request packets'', as the RFC
2703          * describes it.
2704          */
2705         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2706                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2707                         (cps[i])->Down(sp);
2708                         (cps[i])->Close(sp);
2709                 }
2710 }
2711
2712 static void
2713 sppp_lcp_tls(struct sppp *sp)
2714 {
2715         STDDCL;
2716
2717         sp->pp_phase = PHASE_ESTABLISH;
2718
2719         if (debug)
2720                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2721                     sppp_phase_name(sp->pp_phase));
2722
2723         /* Notify lower layer if desired. */
2724         if (sp->pp_tls)
2725                 (sp->pp_tls)(sp);
2726         else
2727                 (sp->pp_up)(sp);
2728 }
2729
2730 static void
2731 sppp_lcp_tlf(struct sppp *sp)
2732 {
2733         STDDCL;
2734
2735         sp->pp_phase = PHASE_DEAD;
2736         if (debug)
2737                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2738                     sppp_phase_name(sp->pp_phase));
2739
2740         /* Notify lower layer if desired. */
2741         if (sp->pp_tlf)
2742                 (sp->pp_tlf)(sp);
2743         else
2744                 (sp->pp_down)(sp);
2745 }
2746
2747 static void
2748 sppp_lcp_scr(struct sppp *sp)
2749 {
2750         char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2751         int i = 0;
2752         u_short authproto;
2753
2754         if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2755                 if (! sp->lcp.magic)
2756                         sp->lcp.magic = random();
2757                 opt[i++] = LCP_OPT_MAGIC;
2758                 opt[i++] = 6;
2759                 opt[i++] = sp->lcp.magic >> 24;
2760                 opt[i++] = sp->lcp.magic >> 16;
2761                 opt[i++] = sp->lcp.magic >> 8;
2762                 opt[i++] = sp->lcp.magic;
2763         }
2764
2765         if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2766                 opt[i++] = LCP_OPT_MRU;
2767                 opt[i++] = 4;
2768                 opt[i++] = sp->lcp.mru >> 8;
2769                 opt[i++] = sp->lcp.mru;
2770         }
2771
2772         if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2773                 authproto = sp->hisauth.proto;
2774                 opt[i++] = LCP_OPT_AUTH_PROTO;
2775                 opt[i++] = authproto == PPP_CHAP? 5: 4;
2776                 opt[i++] = authproto >> 8;
2777                 opt[i++] = authproto;
2778                 if (authproto == PPP_CHAP)
2779                         opt[i++] = CHAP_MD5;
2780         }
2781
2782         sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2783         sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2784 }
2785
2786 /*
2787  * Check the open NCPs, return true if at least one NCP is open.
2788  */
2789 static int
2790 sppp_ncp_check(struct sppp *sp)
2791 {
2792         int i, mask;
2793
2794         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2795                 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2796                         return 1;
2797         return 0;
2798 }
2799
2800 /*
2801  * Re-check the open NCPs and see if we should terminate the link.
2802  * Called by the NCPs during their tlf action handling.
2803  */
2804 static void
2805 sppp_lcp_check_and_close(struct sppp *sp)
2806 {
2807
2808         if (sp->pp_phase < PHASE_NETWORK)
2809                 /* don't bother, we are already going down */
2810                 return;
2811
2812         if (sppp_ncp_check(sp))
2813                 return;
2814
2815         lcp.Close(sp);
2816 }
2817
2818 /*
2819  *--------------------------------------------------------------------------*
2820  *                                                                          *
2821  *                        The IPCP implementation.                          *
2822  *                                                                          *
2823  *--------------------------------------------------------------------------*
2824  */
2825
2826 #ifdef INET
2827 static void
2828 sppp_ipcp_init(struct sppp *sp)
2829 {
2830         sp->ipcp.opts = 0;
2831         sp->ipcp.flags = 0;
2832         sp->state[IDX_IPCP] = STATE_INITIAL;
2833         sp->fail_counter[IDX_IPCP] = 0;
2834         sp->pp_seq[IDX_IPCP] = 0;
2835         sp->pp_rseq[IDX_IPCP] = 0;
2836         callout_init(&sp->ch[IDX_IPCP], 1);
2837 }
2838
2839 static void
2840 sppp_ipcp_up(struct sppp *sp)
2841 {
2842         sppp_up_event(&ipcp, sp);
2843 }
2844
2845 static void
2846 sppp_ipcp_down(struct sppp *sp)
2847 {
2848         sppp_down_event(&ipcp, sp);
2849 }
2850
2851 static void
2852 sppp_ipcp_open(struct sppp *sp)
2853 {
2854         STDDCL;
2855         u_long myaddr, hisaddr;
2856
2857         sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
2858                             IPCP_MYADDR_DYN | IPCP_VJ);
2859         sp->ipcp.opts = 0;
2860
2861         sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2862         /*
2863          * If we don't have his address, this probably means our
2864          * interface doesn't want to talk IP at all.  (This could
2865          * be the case if somebody wants to speak only IPX, for
2866          * example.)  Don't open IPCP in this case.
2867          */
2868         if (hisaddr == 0L) {
2869                 /* XXX this message should go away */
2870                 if (debug)
2871                         log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2872                             SPP_ARGS(ifp));
2873                 return;
2874         }
2875         if (myaddr == 0L) {
2876                 /*
2877                  * I don't have an assigned address, so i need to
2878                  * negotiate my address.
2879                  */
2880                 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2881                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2882         } else
2883                 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2884         if (sp->confflags & CONF_ENABLE_VJ) {
2885                 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
2886                 sp->ipcp.max_state = MAX_STATES - 1;
2887                 sp->ipcp.compress_cid = 1;
2888         }
2889         sppp_open_event(&ipcp, sp);
2890 }
2891
2892 static void
2893 sppp_ipcp_close(struct sppp *sp)
2894 {
2895         sppp_close_event(&ipcp, sp);
2896         if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2897                 /*
2898                  * My address was dynamic, clear it again.
2899                  */
2900                 sppp_set_ip_addr(sp, 0L);
2901 }
2902
2903 static void
2904 sppp_ipcp_TO(void *cookie)
2905 {
2906         sppp_to_event(&ipcp, (struct sppp *)cookie);
2907 }
2908
2909 /*
2910  * Analyze a configure request.  Return true if it was agreeable, and
2911  * caused action sca, false if it has been rejected or nak'ed, and
2912  * caused action scn.  (The return value is used to make the state
2913  * transition decision in the state automaton.)
2914  */
2915 static int
2916 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2917 {
2918         u_char *buf, *r, *p;
2919         struct ifnet *ifp = SP2IFP(sp);
2920         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2921         u_long hisaddr, desiredaddr;
2922         int gotmyaddr = 0;
2923         int desiredcomp;
2924
2925         len -= 4;
2926         origlen = len;
2927         /*
2928          * Make sure to allocate a buf that can at least hold a
2929          * conf-nak with an `address' option.  We might need it below.
2930          */
2931         buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
2932         if (! buf)
2933                 return (0);
2934
2935         /* pass 1: see if we can recognize them */
2936         if (debug)
2937                 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2938                     SPP_ARGS(ifp));
2939         p = (void*) (h+1);
2940         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2941             len-=p[1], p+=p[1]) {
2942                 if (debug)
2943                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
2944                 switch (*p) {
2945                 case IPCP_OPT_COMPRESSION:
2946                         if (!(sp->confflags & CONF_ENABLE_VJ)) {
2947                                 /* VJ compression administratively disabled */
2948                                 if (debug)
2949                                         log(-1, "[locally disabled] ");
2950                                 break;
2951                         }
2952                         /*
2953                          * In theory, we should only conf-rej an
2954                          * option that is shorter than RFC 1618
2955                          * requires (i.e. < 4), and should conf-nak
2956                          * anything else that is not VJ.  However,
2957                          * since our algorithm always uses the
2958                          * original option to NAK it with new values,
2959                          * things would become more complicated.  In
2960                          * practice, the only commonly implemented IP
2961                          * compression option is VJ anyway, so the
2962                          * difference is negligible.
2963                          */
2964                         if (len >= 6 && p[1] == 6) {
2965                                 /*
2966                                  * correctly formed compression option
2967                                  * that could be VJ compression
2968                                  */
2969                                 continue;
2970                         }
2971                         if (debug)
2972                                 log(-1,
2973                                     "optlen %d [invalid/unsupported] ",
2974                                     p[1]);
2975                         break;
2976                 case IPCP_OPT_ADDRESS:
2977                         if (len >= 6 && p[1] == 6) {
2978                                 /* correctly formed address option */
2979                                 continue;
2980                         }
2981                         if (debug)
2982                                 log(-1, "[invalid] ");
2983                         break;
2984                 default:
2985                         /* Others not supported. */
2986                         if (debug)
2987                                 log(-1, "[rej] ");
2988                         break;
2989                 }
2990                 /* Add the option to rejected list. */
2991                 bcopy (p, r, p[1]);
2992                 r += p[1];
2993                 rlen += p[1];
2994         }
2995         if (rlen) {
2996                 if (debug)
2997                         log(-1, " send conf-rej\n");
2998                 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
2999                 return 0;
3000         } else if (debug)
3001                 log(-1, "\n");
3002
3003         /* pass 2: parse option values */
3004         sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
3005         if (debug)
3006                 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
3007                        SPP_ARGS(ifp));
3008         p = (void*) (h+1);
3009         len = origlen;
3010         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3011             len-=p[1], p+=p[1]) {
3012                 if (debug)
3013                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3014                 switch (*p) {
3015                 case IPCP_OPT_COMPRESSION:
3016                         desiredcomp = p[2] << 8 | p[3];
3017                         /* We only support VJ */
3018                         if (desiredcomp == IPCP_COMP_VJ) {
3019                                 if (debug)
3020                                         log(-1, "VJ [ack] ");
3021                                 sp->ipcp.flags |= IPCP_VJ;
3022                                 sl_compress_init(sp->pp_comp, p[4]);
3023                                 sp->ipcp.max_state = p[4];
3024                                 sp->ipcp.compress_cid = p[5];
3025                                 continue;
3026                         }
3027                         if (debug)
3028                                 log(-1,
3029                                     "compproto %#04x [not supported] ",
3030                                     desiredcomp);
3031                         p[2] = IPCP_COMP_VJ >> 8;
3032                         p[3] = IPCP_COMP_VJ;
3033                         p[4] = sp->ipcp.max_state;
3034                         p[5] = sp->ipcp.compress_cid;
3035                         break;
3036                 case IPCP_OPT_ADDRESS:
3037                         /* This is the address he wants in his end */
3038                         desiredaddr = p[2] << 24 | p[3] << 16 |
3039                                 p[4] << 8 | p[5];
3040                         if (desiredaddr == hisaddr ||
3041                             (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
3042                                 /*
3043                                  * Peer's address is same as our value,
3044                                  * or we have set it to 0.0.0.* to
3045                                  * indicate that we do not really care,
3046                                  * this is agreeable.  Gonna conf-ack
3047                                  * it.
3048                                  */
3049                                 if (debug)
3050                                         log(-1, "%s [ack] ",
3051                                                 sppp_dotted_quad(hisaddr));
3052                                 /* record that we've seen it already */
3053                                 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
3054                                 continue;
3055                         }
3056                         /*
3057                          * The address wasn't agreeable.  This is either
3058                          * he sent us 0.0.0.0, asking to assign him an
3059                          * address, or he send us another address not
3060                          * matching our value.  Either case, we gonna
3061                          * conf-nak it with our value.
3062                          * XXX: we should "rej" if hisaddr == 0
3063                          */
3064                         if (debug) {
3065                                 if (desiredaddr == 0)
3066                                         log(-1, "[addr requested] ");
3067                                 else
3068                                         log(-1, "%s [not agreed] ",
3069                                                 sppp_dotted_quad(desiredaddr));
3070                         }
3071                         p[2] = hisaddr >> 24;
3072                         p[3] = hisaddr >> 16;
3073                         p[4] = hisaddr >> 8;
3074                         p[5] = hisaddr;
3075                         break;
3076                 }
3077                 /* Add the option to nak'ed list. */
3078                 bcopy (p, r, p[1]);
3079                 r += p[1];
3080                 rlen += p[1];
3081         }
3082
3083         /*
3084          * If we are about to conf-ack the request, but haven't seen
3085          * his address so far, gonna conf-nak it instead, with the
3086          * `address' option present and our idea of his address being
3087          * filled in there, to request negotiation of both addresses.
3088          *
3089          * XXX This can result in an endless req - nak loop if peer
3090          * doesn't want to send us his address.  Q: What should we do
3091          * about it?  XXX  A: implement the max-failure counter.
3092          */
3093         if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
3094                 buf[0] = IPCP_OPT_ADDRESS;
3095                 buf[1] = 6;
3096                 buf[2] = hisaddr >> 24;
3097                 buf[3] = hisaddr >> 16;
3098                 buf[4] = hisaddr >> 8;
3099                 buf[5] = hisaddr;
3100                 rlen = 6;
3101                 if (debug)
3102                         log(-1, "still need hisaddr ");
3103         }
3104
3105         if (rlen) {
3106                 if (debug)
3107                         log(-1, " send conf-nak\n");
3108                 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
3109         } else {
3110                 if (debug)
3111                         log(-1, " send conf-ack\n");
3112                 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
3113                               h->ident, origlen, h+1);
3114         }
3115
3116         free (buf, M_TEMP);
3117         return (rlen == 0);
3118 }
3119
3120 /*
3121  * Analyze the IPCP Configure-Reject option list, and adjust our
3122  * negotiation.
3123  */
3124 static void
3125 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3126 {
3127         u_char *buf, *p;
3128         struct ifnet *ifp = SP2IFP(sp);
3129         int debug = ifp->if_flags & IFF_DEBUG;
3130
3131         len -= 4;
3132         buf = malloc (len, M_TEMP, M_NOWAIT);
3133         if (!buf)
3134                 return;
3135
3136         if (debug)
3137                 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
3138                     SPP_ARGS(ifp));
3139
3140         p = (void*) (h+1);
3141         for (; len >= 2 && p[1] >= 2 && len >= p[1];
3142             len -= p[1], p += p[1]) {
3143                 if (debug)
3144                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3145                 switch (*p) {
3146                 case IPCP_OPT_COMPRESSION:
3147                         sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
3148                         break;
3149                 case IPCP_OPT_ADDRESS:
3150                         /*
3151                          * Peer doesn't grok address option.  This is
3152                          * bad.  XXX  Should we better give up here?
3153                          * XXX We could try old "addresses" option...
3154                          */
3155                         sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3156                         break;
3157                 }
3158         }
3159         if (debug)
3160                 log(-1, "\n");
3161         free (buf, M_TEMP);
3162         return;
3163 }
3164
3165 /*
3166  * Analyze the IPCP Configure-NAK option list, and adjust our
3167  * negotiation.
3168  */
3169 static void
3170 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3171 {
3172         u_char *buf, *p;
3173         struct ifnet *ifp = SP2IFP(sp);
3174         int debug = ifp->if_flags & IFF_DEBUG;
3175         int desiredcomp;
3176         u_long wantaddr;
3177
3178         len -= 4;
3179         buf = malloc (len, M_TEMP, M_NOWAIT);
3180         if (!buf)
3181                 return;
3182
3183         if (debug)
3184                 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
3185                     SPP_ARGS(ifp));
3186
3187         p = (void*) (h+1);
3188         for (; len >= 2 && p[1] >= 2 && len >= p[1];
3189             len -= p[1], p += p[1]) {
3190                 if (debug)
3191                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3192                 switch (*p) {
3193                 case IPCP_OPT_COMPRESSION:
3194                         if (len >= 6 && p[1] == 6) {
3195                                 desiredcomp = p[2] << 8 | p[3];
3196                                 if (debug)
3197                                         log(-1, "[wantcomp %#04x] ",
3198                                                 desiredcomp);
3199                                 if (desiredcomp == IPCP_COMP_VJ) {
3200                                         sl_compress_init(sp->pp_comp, p[4]);
3201                                         sp->ipcp.max_state = p[4];
3202                                         sp->ipcp.compress_cid = p[5];
3203                                         if (debug)
3204                                                 log(-1, "[agree] ");
3205                                 } else
3206                                         sp->ipcp.opts &=
3207                                                 ~(1 << IPCP_OPT_COMPRESSION);
3208                         }
3209                         break;
3210                 case IPCP_OPT_ADDRESS:
3211                         /*
3212                          * Peer doesn't like our local IP address.  See
3213                          * if we can do something for him.  We'll drop
3214                          * him our address then.
3215                          */
3216                         if (len >= 6 && p[1] == 6) {
3217                                 wantaddr = p[2] << 24 | p[3] << 16 |
3218                                         p[4] << 8 | p[5];
3219                                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3220                                 if (debug)
3221                                         log(-1, "[wantaddr %s] ",
3222                                                sppp_dotted_quad(wantaddr));
3223                                 /*
3224                                  * When doing dynamic address assignment,
3225                                  * we accept his offer.  Otherwise, we
3226                                  * ignore it and thus continue to negotiate
3227                                  * our already existing value.
3228                                  * XXX: Bogus, if he said no once, he'll
3229                                  * just say no again, might as well die.
3230                                  */
3231                                 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3232                                         sppp_set_ip_addr(sp, wantaddr);
3233                                         if (debug)
3234                                                 log(-1, "[agree] ");
3235                                         sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3236                                 }
3237                         }
3238                         break;
3239                 }
3240         }
3241         if (debug)
3242                 log(-1, "\n");
3243         free (buf, M_TEMP);
3244         return;
3245 }
3246
3247 static void
3248 sppp_ipcp_tlu(struct sppp *sp)
3249 {
3250         /* we are up - notify isdn daemon */
3251         if (sp->pp_con)
3252                 sp->pp_con(sp);
3253 }
3254
3255 static void
3256 sppp_ipcp_tld(struct sppp *sp)
3257 {
3258 }
3259
3260 static void
3261 sppp_ipcp_tls(struct sppp *sp)
3262 {
3263         /* indicate to LCP that it must stay alive */
3264         sp->lcp.protos |= (1 << IDX_IPCP);
3265 }
3266
3267 static void
3268 sppp_ipcp_tlf(struct sppp *sp)
3269 {
3270         /* we no longer need LCP */
3271         sp->lcp.protos &= ~(1 << IDX_IPCP);
3272         sppp_lcp_check_and_close(sp);
3273 }
3274
3275 static void
3276 sppp_ipcp_scr(struct sppp *sp)
3277 {
3278         char opt[6 /* compression */ + 6 /* address */];
3279         u_long ouraddr;
3280         int i = 0;
3281
3282         if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3283                 opt[i++] = IPCP_OPT_COMPRESSION;
3284                 opt[i++] = 6;
3285                 opt[i++] = IPCP_COMP_VJ >> 8;
3286                 opt[i++] = IPCP_COMP_VJ;
3287                 opt[i++] = sp->ipcp.max_state;
3288                 opt[i++] = sp->ipcp.compress_cid;
3289         }
3290         if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3291                 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3292                 opt[i++] = IPCP_OPT_ADDRESS;
3293                 opt[i++] = 6;
3294                 opt[i++] = ouraddr >> 24;
3295                 opt[i++] = ouraddr >> 16;
3296                 opt[i++] = ouraddr >> 8;
3297                 opt[i++] = ouraddr;
3298         }
3299
3300         sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3301         sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3302 }
3303 #else /* !INET */
3304 static void
3305 sppp_ipcp_init(struct sppp *sp)
3306 {
3307 }
3308
3309 static void
3310 sppp_ipcp_up(struct sppp *sp)
3311 {
3312 }
3313
3314 static void
3315 sppp_ipcp_down(struct sppp *sp)
3316 {
3317 }
3318
3319 static void
3320 sppp_ipcp_open(struct sppp *sp)
3321 {
3322 }
3323
3324 static void
3325 sppp_ipcp_close(struct sppp *sp)
3326 {
3327 }
3328
3329 static void
3330 sppp_ipcp_TO(void *cookie)
3331 {
3332 }
3333
3334 static int
3335 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3336 {
3337         return (0);
3338 }
3339
3340 static void
3341 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3342 {
3343 }
3344
3345 static void
3346 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3347 {
3348 }
3349
3350 static void
3351 sppp_ipcp_tlu(struct sppp *sp)
3352 {
3353 }
3354
3355 static void
3356 sppp_ipcp_tld(struct sppp *sp)
3357 {
3358 }
3359
3360 static void
3361 sppp_ipcp_tls(struct sppp *sp)
3362 {
3363 }
3364
3365 static void
3366 sppp_ipcp_tlf(struct sppp *sp)
3367 {
3368 }
3369
3370 static void
3371 sppp_ipcp_scr(struct sppp *sp)
3372 {
3373 }
3374 #endif
3375
3376 /*
3377  *--------------------------------------------------------------------------*
3378  *                                                                          *
3379  *                      The IPv6CP implementation.                          *
3380  *                                                                          *
3381  *--------------------------------------------------------------------------*
3382  */
3383
3384 #ifdef INET6
3385 static void
3386 sppp_ipv6cp_init(struct sppp *sp)
3387 {
3388         sp->ipv6cp.opts = 0;
3389         sp->ipv6cp.flags = 0;
3390         sp->state[IDX_IPV6CP] = STATE_INITIAL;
3391         sp->fail_counter[IDX_IPV6CP] = 0;
3392         sp->pp_seq[IDX_IPV6CP] = 0;
3393         sp->pp_rseq[IDX_IPV6CP] = 0;
3394         callout_init(&sp->ch[IDX_IPV6CP], 1);
3395 }
3396
3397 static void
3398 sppp_ipv6cp_up(struct sppp *sp)
3399 {
3400         sppp_up_event(&ipv6cp, sp);
3401 }
3402
3403 static void
3404 sppp_ipv6cp_down(struct sppp *sp)
3405 {
3406         sppp_down_event(&ipv6cp, sp);
3407 }
3408
3409 static void
3410 sppp_ipv6cp_open(struct sppp *sp)
3411 {
3412         STDDCL;
3413         struct in6_addr myaddr, hisaddr;
3414
3415 #ifdef IPV6CP_MYIFID_DYN
3416         sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3417 #else
3418         sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3419 #endif
3420
3421         sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3422         /*
3423          * If we don't have our address, this probably means our
3424          * interface doesn't want to talk IPv6 at all.  (This could
3425          * be the case if somebody wants to speak only IPX, for
3426          * example.)  Don't open IPv6CP in this case.
3427          */
3428         if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3429                 /* XXX this message should go away */
3430                 if (debug)
3431                         log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
3432                             SPP_ARGS(ifp));
3433                 return;
3434         }
3435
3436         sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3437         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3438         sppp_open_event(&ipv6cp, sp);
3439 }
3440
3441 static void
3442 sppp_ipv6cp_close(struct sppp *sp)
3443 {
3444         sppp_close_event(&ipv6cp, sp);
3445 }
3446
3447 static void
3448 sppp_ipv6cp_TO(void *cookie)
3449 {
3450         sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3451 }
3452
3453 /*
3454  * Analyze a configure request.  Return true if it was agreeable, and
3455  * caused action sca, false if it has been rejected or nak'ed, and
3456  * caused action scn.  (The return value is used to make the state
3457  * transition decision in the state automaton.)
3458  */
3459 static int
3460 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3461 {
3462         u_char *buf, *r, *p;
3463         struct ifnet *ifp = SP2IFP(sp);
3464         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3465         struct in6_addr myaddr, desiredaddr, suggestaddr;
3466         int ifidcount;
3467         int type;
3468         int collision, nohisaddr;
3469         char ip6buf[INET6_ADDRSTRLEN];
3470
3471         len -= 4;
3472         origlen = len;
3473         /*
3474          * Make sure to allocate a buf that can at least hold a
3475          * conf-nak with an `address' option.  We might need it below.
3476          */
3477         buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
3478         if (! buf)
3479                 return (0);
3480
3481         /* pass 1: see if we can recognize them */
3482         if (debug)
3483                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
3484                     SPP_ARGS(ifp));
3485         p = (void*) (h+1);
3486         ifidcount = 0;
3487         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3488             len-=p[1], p+=p[1]) {
3489                 if (debug)
3490                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3491                 switch (*p) {
3492                 case IPV6CP_OPT_IFID:
3493                         if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3494                                 /* correctly formed address option */
3495                                 ifidcount++;
3496                                 continue;
3497                         }
3498                         if (debug)
3499                                 log(-1, " [invalid]");
3500                         break;
3501 #ifdef notyet
3502                 case IPV6CP_OPT_COMPRESSION:
3503                         if (len >= 4 && p[1] >= 4) {
3504                                 /* correctly formed compress option */
3505                                 continue;
3506                         }
3507                         if (debug)
3508                                 log(-1, " [invalid]");
3509                         break;
3510 #endif
3511                 default:
3512                         /* Others not supported. */
3513                         if (debug)
3514                                 log(-1, " [rej]");
3515                         break;
3516                 }
3517                 /* Add the option to rejected list. */
3518                 bcopy (p, r, p[1]);
3519                 r += p[1];
3520                 rlen += p[1];
3521         }
3522         if (rlen) {
3523                 if (debug)
3524                         log(-1, " send conf-rej\n");
3525                 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3526                 goto end;
3527         } else if (debug)
3528                 log(-1, "\n");
3529
3530         /* pass 2: parse option values */
3531         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3532         if (debug)
3533                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
3534                     SPP_ARGS(ifp));
3535         p = (void*) (h+1);
3536         len = origlen;
3537         type = CONF_ACK;
3538         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3539             len-=p[1], p+=p[1]) {
3540                 if (debug)
3541                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3542                 switch (*p) {
3543 #ifdef notyet
3544                 case IPV6CP_OPT_COMPRESSION:
3545                         continue;
3546 #endif
3547                 case IPV6CP_OPT_IFID:
3548                         bzero(&desiredaddr, sizeof(desiredaddr));
3549                         bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3550                         collision = (bcmp(&desiredaddr.s6_addr[8],
3551                                           &myaddr.s6_addr[8], 8) == 0);
3552                         nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3553
3554                         desiredaddr.s6_addr16[0] = htons(0xfe80);
3555                         (void)in6_setscope(&desiredaddr, SP2IFP(sp), NULL);
3556
3557                         if (!collision && !nohisaddr) {
3558                                 /* no collision, hisaddr known - Conf-Ack */
3559                                 type = CONF_ACK;
3560
3561                                 if (debug) {
3562                                         log(-1, " %s [%s]",
3563                                             ip6_sprintf(ip6buf, &desiredaddr),
3564                                             sppp_cp_type_name(type));
3565                                 }
3566                                 continue;
3567                         }
3568
3569                         bzero(&suggestaddr, sizeof(suggestaddr));
3570                         if (collision && nohisaddr) {
3571                                 /* collision, hisaddr unknown - Conf-Rej */
3572                                 type = CONF_REJ;
3573                                 bzero(&p[2], 8);
3574                         } else {
3575                                 /*
3576                                  * - no collision, hisaddr unknown, or
3577                                  * - collision, hisaddr known
3578                                  * Conf-Nak, suggest hisaddr
3579                                  */
3580                                 type = CONF_NAK;
3581                                 sppp_suggest_ip6_addr(sp, &suggestaddr);
3582                                 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3583                         }
3584                         if (debug)
3585                                 log(-1, " %s [%s]",
3586                                     ip6_sprintf(ip6buf, &desiredaddr),
3587                                     sppp_cp_type_name(type));
3588                         break;
3589                 }
3590                 /* Add the option to nak'ed list. */
3591                 bcopy (p, r, p[1]);
3592                 r += p[1];
3593                 rlen += p[1];
3594         }
3595
3596         if (rlen == 0 && type == CONF_ACK) {
3597                 if (debug)
3598                         log(-1, " send %s\n", sppp_cp_type_name(type));
3599                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
3600         } else {
3601 #ifdef DIAGNOSTIC
3602                 if (type == CONF_ACK)
3603                         panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3604 #endif
3605
3606                 if (debug) {
3607                         log(-1, " send %s suggest %s\n",
3608                             sppp_cp_type_name(type),
3609                             ip6_sprintf(ip6buf, &suggestaddr));
3610                 }
3611                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3612         }
3613
3614  end:
3615         free (buf, M_TEMP);
3616         return (rlen == 0);
3617 }
3618
3619 /*
3620  * Analyze the IPv6CP Configure-Reject option list, and adjust our
3621  * negotiation.
3622  */
3623 static void
3624 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3625 {
3626         u_char *buf, *p;
3627         struct ifnet *ifp = SP2IFP(sp);
3628         int debug = ifp->if_flags & IFF_DEBUG;
3629
3630         len -= 4;
3631         buf = malloc (len, M_TEMP, M_NOWAIT);
3632         if (!buf)
3633                 return;
3634
3635         if (debug)
3636                 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
3637                     SPP_ARGS(ifp));
3638
3639         p = (void*) (h+1);
3640         for (; len >= 2 && p[1] >= 2 && len >= p[1];
3641             len -= p[1], p += p[1]) {
3642                 if (debug)
3643                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3644                 switch (*p) {
3645                 case IPV6CP_OPT_IFID:
3646                         /*
3647                          * Peer doesn't grok address option.  This is
3648                          * bad.  XXX  Should we better give up here?
3649                          */
3650                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3651                         break;
3652 #ifdef notyet
3653                 case IPV6CP_OPT_COMPRESS:
3654                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3655                         break;
3656 #endif
3657                 }
3658         }
3659         if (debug)
3660                 log(-1, "\n");
3661         free (buf, M_TEMP);
3662         return;
3663 }
3664
3665 /*
3666  * Analyze the IPv6CP Configure-NAK option list, and adjust our
3667  * negotiation.
3668  */
3669 static void
3670 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3671 {
3672         u_char *buf, *p;
3673         struct ifnet *ifp = SP2IFP(sp);
3674         int debug = ifp->if_flags & IFF_DEBUG;
3675         struct in6_addr suggestaddr;
3676         char ip6buf[INET6_ADDRSTRLEN];
3677
3678         len -= 4;
3679         buf = malloc (len, M_TEMP, M_NOWAIT);
3680         if (!buf)
3681                 return;
3682
3683         if (debug)
3684                 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:",
3685                     SPP_ARGS(ifp));
3686
3687         p = (void*) (h+1);
3688         for (; len >= 2 && p[1] >= 2 && len >= p[1];
3689             len -= p[1], p += p[1]) {
3690                 if (debug)
3691                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3692                 switch (*p) {
3693                 case IPV6CP_OPT_IFID:
3694                         /*
3695                          * Peer doesn't like our local ifid.  See
3696                          * if we can do something for him.  We'll drop
3697                          * him our address then.
3698                          */
3699                         if (len < 10 || p[1] != 10)
3700                                 break;
3701                         bzero(&suggestaddr, sizeof(suggestaddr));
3702                         suggestaddr.s6_addr16[0] = htons(0xfe80);
3703                         (void)in6_setscope(&suggestaddr, SP2IFP(sp), NULL);
3704                         bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3705
3706                         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3707                         if (debug)
3708                                 log(-1, " [suggestaddr %s]",
3709                                        ip6_sprintf(ip6buf, &suggestaddr));
3710 #ifdef IPV6CP_MYIFID_DYN
3711                         /*
3712                          * When doing dynamic address assignment,
3713                          * we accept his offer.
3714                          */
3715                         if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3716                                 struct in6_addr lastsuggest;
3717                                 /*
3718                                  * If <suggested myaddr from peer> equals to
3719                                  * <hisaddr we have suggested last time>,
3720                                  * we have a collision.  generate new random
3721                                  * ifid.
3722                                  */
3723                                 sppp_suggest_ip6_addr(&lastsuggest);
3724                                 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
3725                                                        lastsuggest)) {
3726                                         if (debug)
3727                                                 log(-1, " [random]");
3728                                         sppp_gen_ip6_addr(sp, &suggestaddr);
3729                                 }
3730                                 sppp_set_ip6_addr(sp, &suggestaddr, 0);
3731                                 if (debug)
3732                                         log(-1, " [agree]");
3733                                 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3734                         }
3735 #else
3736                         /*
3737                          * Since we do not do dynamic address assignment,
3738                          * we ignore it and thus continue to negotiate
3739                          * our already existing value.  This can possibly
3740                          * go into infinite request-reject loop.
3741                          *
3742                          * This is not likely because we normally use
3743                          * ifid based on MAC-address.
3744                          * If you have no ethernet card on the node, too bad.
3745                          * XXX should we use fail_counter?
3746                          */
3747 #endif
3748                         break;
3749 #ifdef notyet
3750                 case IPV6CP_OPT_COMPRESS:
3751                         /*
3752                          * Peer wants different compression parameters.
3753                          */
3754                         break;
3755 #endif
3756                 }
3757         }
3758         if (debug)
3759                 log(-1, "\n");
3760         free (buf, M_TEMP);
3761         return;
3762 }
3763 static void
3764 sppp_ipv6cp_tlu(struct sppp *sp)
3765 {
3766         /* we are up - notify isdn daemon */
3767         if (sp->pp_con)
3768                 sp->pp_con(sp);
3769 }
3770
3771 static void
3772 sppp_ipv6cp_tld(struct sppp *sp)
3773 {
3774 }
3775
3776 static void
3777 sppp_ipv6cp_tls(struct sppp *sp)
3778 {
3779         /* indicate to LCP that it must stay alive */
3780         sp->lcp.protos |= (1 << IDX_IPV6CP);
3781 }
3782
3783 static void
3784 sppp_ipv6cp_tlf(struct sppp *sp)
3785 {
3786
3787 #if 0   /* need #if 0 to close IPv6CP properly */
3788         /* we no longer need LCP */
3789         sp->lcp.protos &= ~(1 << IDX_IPV6CP);
3790         sppp_lcp_check_and_close(sp);
3791 #endif
3792 }
3793
3794 static void
3795 sppp_ipv6cp_scr(struct sppp *sp)
3796 {
3797         char opt[10 /* ifid */ + 4 /* compression, minimum */];
3798         struct in6_addr ouraddr;
3799         int i = 0;
3800
3801         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
3802                 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
3803                 opt[i++] = IPV6CP_OPT_IFID;
3804                 opt[i++] = 10;
3805                 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
3806                 i += 8;
3807         }
3808
3809 #ifdef notyet
3810         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
3811                 opt[i++] = IPV6CP_OPT_COMPRESSION;
3812                 opt[i++] = 4;
3813                 opt[i++] = 0;   /* TBD */
3814                 opt[i++] = 0;   /* TBD */
3815                 /* variable length data may follow */
3816         }
3817 #endif
3818
3819         sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
3820         sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt);
3821 }
3822 #else /*INET6*/
3823 static void sppp_ipv6cp_init(struct sppp *sp)
3824 {
3825 }
3826
3827 static void sppp_ipv6cp_up(struct sppp *sp)
3828 {
3829 }
3830
3831 static void sppp_ipv6cp_down(struct sppp *sp)
3832 {
3833 }
3834
3835 static void sppp_ipv6cp_open(struct sppp *sp)
3836 {
3837 }
3838
3839 static void sppp_ipv6cp_close(struct sppp *sp)
3840 {
3841 }
3842
3843 static void sppp_ipv6cp_TO(void *sp)
3844 {
3845 }
3846
3847 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3848 {
3849         return 0;
3850 }
3851
3852 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3853 {
3854 }
3855
3856 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3857 {
3858 }
3859
3860 static void sppp_ipv6cp_tlu(struct sppp *sp)
3861 {
3862 }
3863
3864 static void sppp_ipv6cp_tld(struct sppp *sp)
3865 {
3866 }
3867
3868 static void sppp_ipv6cp_tls(struct sppp *sp)
3869 {
3870 }
3871
3872 static void sppp_ipv6cp_tlf(struct sppp *sp)
3873 {
3874 }
3875
3876 static void sppp_ipv6cp_scr(struct sppp *sp)
3877 {
3878 }
3879 #endif /*INET6*/
3880
3881 /*
3882  *--------------------------------------------------------------------------*
3883  *                                                                          *
3884  *                        The CHAP implementation.                          *
3885  *                                                                          *
3886  *--------------------------------------------------------------------------*
3887  */
3888
3889 /*
3890  * The authentication protocols don't employ a full-fledged state machine as
3891  * the control protocols do, since they do have Open and Close events, but
3892  * not Up and Down, nor are they explicitly terminated.  Also, use of the
3893  * authentication protocols may be different in both directions (this makes
3894  * sense, think of a machine that never accepts incoming calls but only
3895  * calls out, it doesn't require the called party to authenticate itself).
3896  *
3897  * Our state machine for the local authentication protocol (we are requesting
3898  * the peer to authenticate) looks like:
3899  *
3900  *                                                  RCA-
3901  *            +--------------------------------------------+
3902  *            V                                     scn,tld|
3903  *        +--------+                           Close   +---------+ RCA+
3904  *        |        |<----------------------------------|         |------+
3905  *   +--->| Closed |                            TO*    | Opened  | sca  |
3906  *   |    |        |-----+                     +-------|         |<-----+
3907  *   |    +--------+ irc |                     |       +---------+
3908  *   |      ^            |                     |           ^
3909  *   |      |            |                     |           |
3910  *   |      |            |                     |           |
3911  *   |   TO-|            |                     |           |
3912  *   |      |tld  TO+    V                     |           |
3913  *   |      |   +------->+                     |           |
3914  *   |      |   |        |                     |           |
3915  *   |    +--------+     V                     |           |
3916  *   |    |        |<----+<--------------------+           |
3917  *   |    | Req-   | scr                                   |
3918  *   |    | Sent   |                                       |
3919  *   |    |        |                                       |
3920  *   |    +--------+                                       |
3921  *   | RCA- |   | RCA+                                     |
3922  *   +------+   +------------------------------------------+
3923  *   scn,tld      sca,irc,ict,tlu
3924  *
3925  *
3926  *   with:
3927  *
3928  *      Open:   LCP reached authentication phase
3929  *      Close:  LCP reached terminate phase
3930  *
3931  *      RCA+:   received reply (pap-req, chap-response), acceptable
3932  *      RCN:    received reply (pap-req, chap-response), not acceptable
3933  *      TO+:    timeout with restart counter >= 0
3934  *      TO-:    timeout with restart counter < 0
3935  *      TO*:    reschedule timeout for CHAP
3936  *
3937  *      scr:    send request packet (none for PAP, chap-challenge)
3938  *      sca:    send ack packet (pap-ack, chap-success)
3939  *      scn:    send nak packet (pap-nak, chap-failure)
3940  *      ict:    initialize re-challenge timer (CHAP only)
3941  *
3942  *      tlu:    this-layer-up, LCP reaches network phase
3943  *      tld:    this-layer-down, LCP enters terminate phase
3944  *
3945  * Note that in CHAP mode, after sending a new challenge, while the state
3946  * automaton falls back into Req-Sent state, it doesn't signal a tld
3947  * event to LCP, so LCP remains in network phase.  Only after not getting
3948  * any response (or after getting an unacceptable response), CHAP closes,
3949  * causing LCP to enter terminate phase.
3950  *
3951  * With PAP, there is no initial request that can be sent.  The peer is
3952  * expected to send one based on the successful negotiation of PAP as
3953  * the authentication protocol during the LCP option negotiation.
3954  *
3955  * Incoming authentication protocol requests (remote requests
3956  * authentication, we are peer) don't employ a state machine at all,
3957  * they are simply answered.  Some peers [Ascend P50 firmware rev
3958  * 4.50] react allergically when sending IPCP requests while they are
3959  * still in authentication phase (thereby violating the standard that
3960  * demands that these NCP packets are to be discarded), so we keep
3961  * track of the peer demanding us to authenticate, and only proceed to
3962  * phase network once we've seen a positive acknowledge for the
3963  * authentication.
3964  */
3965
3966 /*
3967  * Handle incoming CHAP packets.
3968  */
3969 static void
3970 sppp_chap_input(struct sppp *sp, struct mbuf *m)
3971 {
3972         STDDCL;
3973         struct lcp_header *h;
3974         int len;
3975         u_char *value, *name, digest[AUTHKEYLEN], dsize;
3976         int value_len, name_len;
3977         MD5_CTX ctx;
3978
3979         len = m->m_pkthdr.len;
3980         if (len < 4) {
3981                 if (debug)
3982                         log(LOG_DEBUG,
3983                             SPP_FMT "chap invalid packet length: %d bytes\n",
3984                             SPP_ARGS(ifp), len);
3985                 return;
3986         }
3987         h = mtod (m, struct lcp_header*);
3988         if (len > ntohs (h->len))
3989                 len = ntohs (h->len);
3990
3991         switch (h->type) {
3992         /* challenge, failure and success are his authproto */
3993         case CHAP_CHALLENGE:
3994                 value = 1 + (u_char*)(h+1);
3995                 value_len = value[-1];
3996                 name = value + value_len;
3997                 name_len = len - value_len - 5;
3998                 if (name_len < 0) {
3999                         if (debug) {
4000                                 log(LOG_DEBUG,
4001                                     SPP_FMT "chap corrupted challenge "
4002                                     "<%s id=0x%x len=%d",
4003                                     SPP_ARGS(ifp),
4004                                     sppp_auth_type_name(PPP_CHAP, h->type),
4005                                     h->ident, ntohs(h->len));
4006                                 sppp_print_bytes((u_char*) (h+1), len-4);
4007                                 log(-1, ">\n");
4008                         }
4009                         break;
4010                 }
4011
4012                 if (debug) {
4013                         log(LOG_DEBUG,
4014                             SPP_FMT "chap input <%s id=0x%x len=%d name=",
4015                             SPP_ARGS(ifp),
4016                             sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
4017                             ntohs(h->len));
4018                         sppp_print_string((char*) name, name_len);
4019                         log(-1, " value-size=%d value=", value_len);
4020                         sppp_print_bytes(value, value_len);
4021                         log(-1, ">\n");
4022                 }
4023
4024                 /* Compute reply value. */
4025                 MD5Init(&ctx);
4026                 MD5Update(&ctx, &h->ident, 1);
4027                 MD5Update(&ctx, sp->myauth.secret,
4028                           sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
4029                 MD5Update(&ctx, value, value_len);
4030                 MD5Final(digest, &ctx);
4031                 dsize = sizeof digest;
4032
4033                 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
4034                                sizeof dsize, (const char *)&dsize,
4035                                sizeof digest, digest,
4036                                (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4037                                sp->myauth.name,
4038                                0);
4039                 break;
4040
4041         case CHAP_SUCCESS:
4042                 if (debug) {
4043                         log(LOG_DEBUG, SPP_FMT "chap success",
4044                             SPP_ARGS(ifp));
4045                         if (len > 4) {
4046                                 log(-1, ": ");
4047                                 sppp_print_string((char*)(h + 1), len - 4);
4048                         }
4049                         log(-1, "\n");
4050                 }
4051                 SPPP_LOCK(sp);
4052                 sp->pp_flags &= ~PP_NEEDAUTH;
4053                 if (sp->myauth.proto == PPP_CHAP &&
4054                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4055                     (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
4056                         /*
4057                          * We are authenticator for CHAP but didn't
4058                          * complete yet.  Leave it to tlu to proceed
4059                          * to network phase.
4060                          */
4061                         SPPP_UNLOCK(sp);
4062                         break;
4063                 }
4064                 SPPP_UNLOCK(sp);
4065                 sppp_phase_network(sp);
4066                 break;
4067
4068         case CHAP_FAILURE:
4069                 if (debug) {
4070                         log(LOG_INFO, SPP_FMT "chap failure",
4071                             SPP_ARGS(ifp));
4072                         if (len > 4) {
4073                                 log(-1, ": ");
4074                                 sppp_print_string((char*)(h + 1), len - 4);
4075                         }
4076                         log(-1, "\n");
4077                 } else
4078                         log(LOG_INFO, SPP_FMT "chap failure\n",
4079                             SPP_ARGS(ifp));
4080                 /* await LCP shutdown by authenticator */
4081                 break;
4082
4083         /* response is my authproto */
4084         case CHAP_RESPONSE:
4085                 value = 1 + (u_char*)(h+1);
4086                 value_len = value[-1];
4087                 name = value + value_len;
4088                 name_len = len - value_len - 5;
4089                 if (name_len < 0) {
4090                         if (debug) {
4091                                 log(LOG_DEBUG,
4092                                     SPP_FMT "chap corrupted response "
4093                                     "<%s id=0x%x len=%d",
4094                                     SPP_ARGS(ifp),
4095                                     sppp_auth_type_name(PPP_CHAP, h->type),
4096                                     h->ident, ntohs(h->len));
4097                                 sppp_print_bytes((u_char*)(h+1), len-4);
4098                                 log(-1, ">\n");
4099                         }
4100                         break;
4101                 }
4102                 if (h->ident != sp->confid[IDX_CHAP]) {
4103                         if (debug)
4104                                 log(LOG_DEBUG,
4105                                     SPP_FMT "chap dropping response for old ID "
4106                                     "(got %d, expected %d)\n",
4107                                     SPP_ARGS(ifp),
4108                                     h->ident, sp->confid[IDX_CHAP]);
4109                         break;
4110                 }
4111                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
4112                     || bcmp(name, sp->hisauth.name, name_len) != 0) {
4113                         log(LOG_INFO, SPP_FMT "chap response, his name ",
4114                             SPP_ARGS(ifp));
4115                         sppp_print_string(name, name_len);
4116                         log(-1, " != expected ");
4117                         sppp_print_string(sp->hisauth.name,
4118                                           sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
4119                         log(-1, "\n");
4120                 }
4121                 if (debug) {
4122                         log(LOG_DEBUG, SPP_FMT "chap input(%s) "
4123                             "<%s id=0x%x len=%d name=",
4124                             SPP_ARGS(ifp),
4125                             sppp_state_name(sp->state[IDX_CHAP]),
4126                             sppp_auth_type_name(PPP_CHAP, h->type),
4127                             h->ident, ntohs (h->len));
4128                         sppp_print_string((char*)name, name_len);
4129                         log(-1, " value-size=%d value=", value_len);
4130                         sppp_print_bytes(value, value_len);
4131                         log(-1, ">\n");
4132                 }
4133                 if (value_len != AUTHKEYLEN) {
4134                         if (debug)
4135                                 log(LOG_DEBUG,
4136                                     SPP_FMT "chap bad hash value length: "
4137                                     "%d bytes, should be %d\n",
4138                                     SPP_ARGS(ifp), value_len,
4139                                     AUTHKEYLEN);
4140                         break;
4141                 }
4142
4143                 MD5Init(&ctx);
4144                 MD5Update(&ctx, &h->ident, 1);
4145                 MD5Update(&ctx, sp->hisauth.secret,
4146                           sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
4147                 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
4148                 MD5Final(digest, &ctx);
4149
4150 #define FAILMSG "Failed..."
4151 #define SUCCMSG "Welcome!"
4152
4153                 if (value_len != sizeof digest ||
4154                     bcmp(digest, value, value_len) != 0) {
4155                         /* action scn, tld */
4156                         sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
4157                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4158                                        0);
4159                         chap.tld(sp);
4160                         break;
4161                 }
4162                 /* action sca, perhaps tlu */
4163                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
4164                     sp->state[IDX_CHAP] == STATE_OPENED)
4165                         sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
4166                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4167                                        0);
4168                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
4169                         sppp_cp_change_state(&chap, sp, STATE_OPENED);
4170                         chap.tlu(sp);
4171                 }
4172                 break;
4173
4174         default:
4175                 /* Unknown CHAP packet type -- ignore. */
4176                 if (debug) {
4177                         log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
4178                             "<0x%x id=0x%xh len=%d",
4179                             SPP_ARGS(ifp),
4180                             sppp_state_name(sp->state[IDX_CHAP]),
4181                             h->type, h->ident, ntohs(h->len));
4182                         sppp_print_bytes((u_char*)(h+1), len-4);
4183                         log(-1, ">\n");
4184                 }
4185                 break;
4186         }
4187 }
4188
4189 static void
4190 sppp_chap_init(struct sppp *sp)
4191 {
4192         /* Chap doesn't have STATE_INITIAL at all. */
4193         sp->state[IDX_CHAP] = STATE_CLOSED;
4194         sp->fail_counter[IDX_CHAP] = 0;
4195         sp->pp_seq[IDX_CHAP] = 0;
4196         sp->pp_rseq[IDX_CHAP] = 0;
4197         callout_init(&sp->ch[IDX_CHAP], 1);
4198 }
4199
4200 static void
4201 sppp_chap_open(struct sppp *sp)
4202 {
4203         if (sp->myauth.proto == PPP_CHAP &&
4204             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4205                 /* we are authenticator for CHAP, start it */
4206                 chap.scr(sp);
4207                 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4208                 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4209         }
4210         /* nothing to be done if we are peer, await a challenge */
4211 }
4212
4213 static void
4214 sppp_chap_close(struct sppp *sp)
4215 {
4216         if (sp->state[IDX_CHAP] != STATE_CLOSED)
4217                 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4218 }
4219
4220 static void
4221 sppp_chap_TO(void *cookie)
4222 {
4223         struct sppp *sp = (struct sppp *)cookie;
4224         STDDCL;
4225
4226         SPPP_LOCK(sp);
4227         if (debug)
4228                 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
4229                     SPP_ARGS(ifp),
4230                     sppp_state_name(sp->state[IDX_CHAP]),
4231                     sp->rst_counter[IDX_CHAP]);
4232
4233         if (--sp->rst_counter[IDX_CHAP] < 0)
4234                 /* TO- event */
4235                 switch (sp->state[IDX_CHAP]) {
4236                 case STATE_REQ_SENT:
4237                         chap.tld(sp);
4238                         sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4239                         break;
4240                 }
4241         else
4242                 /* TO+ (or TO*) event */
4243                 switch (sp->state[IDX_CHAP]) {
4244                 case STATE_OPENED:
4245                         /* TO* event */
4246                         sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4247                         /* FALLTHROUGH */
4248                 case STATE_REQ_SENT:
4249                         chap.scr(sp);
4250                         /* sppp_cp_change_state() will restart the timer */
4251                         sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4252                         break;
4253                 }
4254
4255         SPPP_UNLOCK(sp);
4256 }
4257
4258 static void
4259 sppp_chap_tlu(struct sppp *sp)
4260 {
4261         STDDCL;
4262         int i;
4263
4264         i = 0;
4265         sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4266
4267         /*
4268          * Some broken CHAP implementations (Conware CoNet, firmware
4269          * 4.0.?) don't want to re-authenticate their CHAP once the
4270          * initial challenge-response exchange has taken place.
4271          * Provide for an option to avoid rechallenges.
4272          */
4273         if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
4274                 /*
4275                  * Compute the re-challenge timeout.  This will yield
4276                  * a number between 300 and 810 seconds.
4277                  */
4278                 i = 300 + ((unsigned)(random() & 0xff00) >> 7);
4279                 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, (void *)sp);
4280         }
4281
4282         if (debug) {
4283                 log(LOG_DEBUG,
4284                     SPP_FMT "chap %s, ",
4285                     SPP_ARGS(ifp),
4286                     sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
4287                 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
4288                         log(-1, "next re-challenge in %d seconds\n", i);
4289                 else
4290                         log(-1, "re-challenging suppressed\n");
4291         }
4292
4293         SPPP_LOCK(sp);
4294         /* indicate to LCP that we need to be closed down */
4295         sp->lcp.protos |= (1 << IDX_CHAP);
4296
4297         if (sp->pp_flags & PP_NEEDAUTH) {
4298                 /*
4299                  * Remote is authenticator, but his auth proto didn't
4300                  * complete yet.  Defer the transition to network
4301                  * phase.
4302                  */
4303                 SPPP_UNLOCK(sp);
4304                 return;
4305         }
4306         SPPP_UNLOCK(sp);
4307
4308         /*
4309          * If we are already in phase network, we are done here.  This
4310          * is the case if this is a dummy tlu event after a re-challenge.
4311          */
4312         if (sp->pp_phase != PHASE_NETWORK)
4313                 sppp_phase_network(sp);
4314 }
4315
4316 static void
4317 sppp_chap_tld(struct sppp *sp)
4318 {
4319         STDDCL;
4320
4321         if (debug)
4322                 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
4323         callout_stop(&sp->ch[IDX_CHAP]);
4324         sp->lcp.protos &= ~(1 << IDX_CHAP);
4325
4326         lcp.Close(sp);
4327 }
4328
4329 static void
4330 sppp_chap_scr(struct sppp *sp)
4331 {
4332         u_long *ch;
4333         u_char clen;
4334
4335         /* Compute random challenge. */
4336         ch = (u_long *)sp->myauth.challenge;
4337         arc4random_buf(ch, 4 * sizeof(*ch));
4338         clen = AUTHKEYLEN;
4339
4340         sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP];
4341
4342         sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
4343                        sizeof clen, (const char *)&clen,
4344                        (size_t)AUTHKEYLEN, sp->myauth.challenge,
4345                        (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4346                        sp->myauth.name,
4347                        0);
4348 }
4349
4350 /*
4351  *--------------------------------------------------------------------------*
4352  *                                                                          *
4353  *                        The PAP implementation.                           *
4354  *                                                                          *
4355  *--------------------------------------------------------------------------*
4356  */
4357 /*
4358  * For PAP, we need to keep a little state also if we are the peer, not the
4359  * authenticator.  This is since we don't get a request to authenticate, but
4360  * have to repeatedly authenticate ourself until we got a response (or the
4361  * retry counter is expired).
4362  */
4363
4364 /*
4365  * Handle incoming PAP packets.  */
4366 static void
4367 sppp_pap_input(struct sppp *sp, struct mbuf *m)
4368 {
4369         STDDCL;
4370         struct lcp_header *h;
4371         int len;
4372         u_char *name, *passwd, mlen;
4373         int name_len, passwd_len;
4374
4375         len = m->m_pkthdr.len;
4376         if (len < 5) {
4377                 if (debug)
4378                         log(LOG_DEBUG,
4379                             SPP_FMT "pap invalid packet length: %d bytes\n",
4380                             SPP_ARGS(ifp), len);
4381                 return;
4382         }
4383         h = mtod (m, struct lcp_header*);
4384         if (len > ntohs (h->len))
4385                 len = ntohs (h->len);
4386         switch (h->type) {
4387         /* PAP request is my authproto */
4388         case PAP_REQ:
4389                 name = 1 + (u_char*)(h+1);
4390                 name_len = name[-1];
4391                 passwd = name + name_len + 1;
4392                 if (name_len > len - 6 ||
4393                     (passwd_len = passwd[-1]) > len - 6 - name_len) {
4394                         if (debug) {
4395                                 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4396                                     "<%s id=0x%x len=%d",
4397                                     SPP_ARGS(ifp),
4398                                     sppp_auth_type_name(PPP_PAP, h->type),
4399                                     h->ident, ntohs(h->len));
4400                                 sppp_print_bytes((u_char*)(h+1), len-4);
4401                                 log(-1, ">\n");
4402                         }
4403                         break;
4404                 }
4405                 if (debug) {
4406                         log(LOG_DEBUG, SPP_FMT "pap input(%s) "
4407                             "<%s id=0x%x len=%d name=",
4408                             SPP_ARGS(ifp),
4409                             sppp_state_name(sp->state[IDX_PAP]),
4410                             sppp_auth_type_name(PPP_PAP, h->type),
4411                             h->ident, ntohs(h->len));
4412                         sppp_print_string((char*)name, name_len);
4413                         log(-1, " passwd=");
4414                         sppp_print_string((char*)passwd, passwd_len);
4415                         log(-1, ">\n");
4416                 }
4417                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) ||
4418                     passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) ||
4419                     bcmp(name, sp->hisauth.name, name_len) != 0 ||
4420                     bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
4421                         /* action scn, tld */
4422                         mlen = sizeof(FAILMSG) - 1;
4423                         sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
4424                                        sizeof mlen, (const char *)&mlen,
4425                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4426                                        0);
4427                         pap.tld(sp);
4428                         break;
4429                 }
4430                 /* action sca, perhaps tlu */
4431                 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
4432                     sp->state[IDX_PAP] == STATE_OPENED) {
4433                         mlen = sizeof(SUCCMSG) - 1;
4434                         sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
4435                                        sizeof mlen, (const char *)&mlen,
4436                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4437                                        0);
4438                 }
4439                 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
4440                         sppp_cp_change_state(&pap, sp, STATE_OPENED);
4441                         pap.tlu(sp);
4442                 }
4443                 break;
4444
4445         /* ack and nak are his authproto */
4446         case PAP_ACK:
4447                 callout_stop(&sp->pap_my_to_ch);
4448                 if (debug) {
4449                         log(LOG_DEBUG, SPP_FMT "pap success",
4450                             SPP_ARGS(ifp));
4451                         name_len = *((char *)h);
4452                         if (len > 5 && name_len) {
4453                                 log(-1, ": ");
4454                                 sppp_print_string((char*)(h+1), name_len);
4455                         }
4456                         log(-1, "\n");
4457                 }
4458                 SPPP_LOCK(sp);
4459                 sp->pp_flags &= ~PP_NEEDAUTH;
4460                 if (sp->myauth.proto == PPP_PAP &&
4461                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4462                     (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
4463                         /*
4464                          * We are authenticator for PAP but didn't
4465                          * complete yet.  Leave it to tlu to proceed
4466                          * to network phase.
4467                          */
4468                         SPPP_UNLOCK(sp);
4469                         break;
4470                 }
4471                 SPPP_UNLOCK(sp);
4472                 sppp_phase_network(sp);
4473                 break;
4474
4475         case PAP_NAK:
4476                 callout_stop (&sp->pap_my_to_ch);
4477                 if (debug) {
4478                         log(LOG_INFO, SPP_FMT "pap failure",
4479                             SPP_ARGS(ifp));
4480                         name_len = *((char *)h);
4481                         if (len > 5 && name_len) {
4482                                 log(-1, ": ");
4483                                 sppp_print_string((char*)(h+1), name_len);
4484                         }
4485                         log(-1, "\n");
4486                 } else
4487                         log(LOG_INFO, SPP_FMT "pap failure\n",
4488                             SPP_ARGS(ifp));
4489                 /* await LCP shutdown by authenticator */
4490                 break;
4491
4492         default:
4493                 /* Unknown PAP packet type -- ignore. */
4494                 if (debug) {
4495                         log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4496                             "<0x%x id=0x%x len=%d",
4497                             SPP_ARGS(ifp),
4498                             h->type, h->ident, ntohs(h->len));
4499                         sppp_print_bytes((u_char*)(h+1), len-4);
4500                         log(-1, ">\n");
4501                 }
4502                 break;
4503         }
4504 }
4505
4506 static void
4507 sppp_pap_init(struct sppp *sp)
4508 {
4509         /* PAP doesn't have STATE_INITIAL at all. */
4510         sp->state[IDX_PAP] = STATE_CLOSED;
4511         sp->fail_counter[IDX_PAP] = 0;
4512         sp->pp_seq[IDX_PAP] = 0;
4513         sp->pp_rseq[IDX_PAP] = 0;
4514         callout_init(&sp->ch[IDX_PAP], 1);
4515         callout_init(&sp->pap_my_to_ch, 1);
4516 }
4517
4518 static void
4519 sppp_pap_open(struct sppp *sp)
4520 {
4521         if (sp->hisauth.proto == PPP_PAP &&
4522             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4523                 /* we are authenticator for PAP, start our timer */
4524                 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4525                 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4526         }
4527         if (sp->myauth.proto == PPP_PAP) {
4528                 /* we are peer, send a request, and start a timer */
4529                 pap.scr(sp);
4530                 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout,
4531                               sppp_pap_my_TO, (void *)sp);
4532         }
4533 }
4534
4535 static void
4536 sppp_pap_close(struct sppp *sp)
4537 {
4538         if (sp->state[IDX_PAP] != STATE_CLOSED)
4539                 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4540 }
4541
4542 /*
4543  * That's the timeout routine if we are authenticator.  Since the
4544  * authenticator is basically passive in PAP, we can't do much here.
4545  */
4546 static void
4547 sppp_pap_TO(void *cookie)
4548 {
4549         struct sppp *sp = (struct sppp *)cookie;
4550         STDDCL;
4551
4552         SPPP_LOCK(sp);
4553         if (debug)
4554                 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
4555                     SPP_ARGS(ifp),
4556                     sppp_state_name(sp->state[IDX_PAP]),
4557                     sp->rst_counter[IDX_PAP]);
4558
4559         if (--sp->rst_counter[IDX_PAP] < 0)
4560                 /* TO- event */
4561                 switch (sp->state[IDX_PAP]) {
4562                 case STATE_REQ_SENT:
4563                         pap.tld(sp);
4564                         sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4565                         break;
4566                 }
4567         else
4568                 /* TO+ event, not very much we could do */
4569                 switch (sp->state[IDX_PAP]) {
4570                 case STATE_REQ_SENT:
4571                         /* sppp_cp_change_state() will restart the timer */
4572                         sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4573                         break;
4574                 }
4575
4576         SPPP_UNLOCK(sp);
4577 }
4578
4579 /*
4580  * That's the timeout handler if we are peer.  Since the peer is active,
4581  * we need to retransmit our PAP request since it is apparently lost.
4582  * XXX We should impose a max counter.
4583  */
4584 static void
4585 sppp_pap_my_TO(void *cookie)
4586 {
4587         struct sppp *sp = (struct sppp *)cookie;
4588         STDDCL;
4589
4590         if (debug)
4591                 log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
4592                     SPP_ARGS(ifp));
4593
4594         SPPP_LOCK(sp);
4595         pap.scr(sp);
4596         SPPP_UNLOCK(sp);
4597 }
4598
4599 static void
4600 sppp_pap_tlu(struct sppp *sp)
4601 {
4602         STDDCL;
4603
4604         sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4605
4606         if (debug)
4607                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
4608                     SPP_ARGS(ifp), pap.name);
4609
4610         SPPP_LOCK(sp);
4611         /* indicate to LCP that we need to be closed down */
4612         sp->lcp.protos |= (1 << IDX_PAP);
4613
4614         if (sp->pp_flags & PP_NEEDAUTH) {
4615                 /*
4616                  * Remote is authenticator, but his auth proto didn't
4617                  * complete yet.  Defer the transition to network
4618                  * phase.
4619                  */
4620                 SPPP_UNLOCK(sp);
4621                 return;
4622         }
4623         SPPP_UNLOCK(sp);
4624         sppp_phase_network(sp);
4625 }
4626
4627 static void
4628 sppp_pap_tld(struct sppp *sp)
4629 {
4630         STDDCL;
4631
4632         if (debug)
4633                 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
4634         callout_stop (&sp->ch[IDX_PAP]);
4635         callout_stop (&sp->pap_my_to_ch);
4636         sp->lcp.protos &= ~(1 << IDX_PAP);
4637
4638         lcp.Close(sp);
4639 }
4640
4641 static void
4642 sppp_pap_scr(struct sppp *sp)
4643 {
4644         u_char idlen, pwdlen;
4645
4646         sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP];
4647         pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
4648         idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
4649
4650         sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
4651                        sizeof idlen, (const char *)&idlen,
4652                        (size_t)idlen, sp->myauth.name,
4653                        sizeof pwdlen, (const char *)&pwdlen,
4654                        (size_t)pwdlen, sp->myauth.secret,
4655                        0);
4656 }
4657
4658 /*
4659  * Random miscellaneous functions.
4660  */
4661
4662 /*
4663  * Send a PAP or CHAP proto packet.
4664  *
4665  * Varadic function, each of the elements for the ellipsis is of type
4666  * ``size_t mlen, const u_char *msg''.  Processing will stop iff
4667  * mlen == 0.
4668  * NOTE: never declare variadic functions with types subject to type
4669  * promotion (i.e. u_char). This is asking for big trouble depending
4670  * on the architecture you are on...
4671  */
4672
4673 static void
4674 sppp_auth_send(const struct cp *cp, struct sppp *sp,
4675                unsigned int type, unsigned int id,
4676                ...)
4677 {
4678         STDDCL;
4679         struct ppp_header *h;
4680         struct lcp_header *lh;
4681         struct mbuf *m;
4682         u_char *p;
4683         int len;
4684         unsigned int mlen;
4685         const char *msg;
4686         va_list ap;
4687
4688         MGETHDR (m, M_NOWAIT, MT_DATA);
4689         if (! m)
4690                 return;
4691         m->m_pkthdr.rcvif = 0;
4692
4693         h = mtod (m, struct ppp_header*);
4694         h->address = PPP_ALLSTATIONS;           /* broadcast address */
4695         h->control = PPP_UI;                    /* Unnumbered Info */
4696         h->protocol = htons(cp->proto);
4697
4698         lh = (struct lcp_header*)(h + 1);
4699         lh->type = type;
4700         lh->ident = id;
4701         p = (u_char*) (lh+1);
4702
4703         va_start(ap, id);
4704         len = 0;
4705
4706         while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) {
4707                 msg = va_arg(ap, const char *);
4708                 len += mlen;
4709                 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
4710                         va_end(ap);
4711                         m_freem(m);
4712                         return;
4713                 }
4714
4715                 bcopy(msg, p, mlen);
4716                 p += mlen;
4717         }
4718         va_end(ap);
4719
4720         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
4721         lh->len = htons (LCP_HEADER_LEN + len);
4722
4723         if (debug) {
4724                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
4725                     SPP_ARGS(ifp), cp->name,
4726                     sppp_auth_type_name(cp->proto, lh->type),
4727                     lh->ident, ntohs(lh->len));
4728                 sppp_print_bytes((u_char*) (lh+1), len);
4729                 log(-1, ">\n");
4730         }
4731         if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
4732                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
4733 }
4734
4735 /*
4736  * Flush interface queue.
4737  */
4738 static void
4739 sppp_qflush(struct ifqueue *ifq)
4740 {
4741         struct mbuf *m, *n;
4742
4743         n = ifq->ifq_head;
4744         while ((m = n)) {
4745                 n = m->m_nextpkt;
4746                 m_freem (m);
4747         }
4748         ifq->ifq_head = 0;
4749         ifq->ifq_tail = 0;
4750         ifq->ifq_len = 0;
4751 }
4752
4753 /*
4754  * Send keepalive packets, every 10 seconds.
4755  */
4756 static void
4757 sppp_keepalive(void *dummy)
4758 {
4759         struct sppp *sp = (struct sppp*)dummy;
4760         struct ifnet *ifp = SP2IFP(sp);
4761
4762         SPPP_LOCK(sp);
4763         /* Keepalive mode disabled or channel down? */
4764         if (! (sp->pp_flags & PP_KEEPALIVE) ||
4765             ! (ifp->if_drv_flags & IFF_DRV_RUNNING))
4766                 goto out;
4767
4768         if (sp->pp_mode == PP_FR) {
4769                 sppp_fr_keepalive (sp);
4770                 goto out;
4771         }
4772
4773         /* No keepalive in PPP mode if LCP not opened yet. */
4774         if (sp->pp_mode != IFF_CISCO &&
4775             sp->pp_phase < PHASE_AUTHENTICATE)
4776                 goto out;
4777
4778         if (sp->pp_alivecnt == MAXALIVECNT) {
4779                 /* No keepalive packets got.  Stop the interface. */
4780                 printf (SPP_FMT "down\n", SPP_ARGS(ifp));
4781                 if_down (ifp);
4782                 sppp_qflush (&sp->pp_cpq);
4783                 if (sp->pp_mode != IFF_CISCO) {
4784                         /* XXX */
4785                         /* Shut down the PPP link. */
4786                         lcp.Down(sp);
4787                         /* Initiate negotiation. XXX */
4788                         lcp.Up(sp);
4789                 }
4790         }
4791         if (sp->pp_alivecnt <= MAXALIVECNT)
4792                 ++sp->pp_alivecnt;
4793         if (sp->pp_mode == IFF_CISCO)
4794                 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ,
4795                          ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]);
4796         else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
4797                 uint32_t nmagic = htonl(sp->lcp.magic);
4798                 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP];
4799                 sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
4800                         sp->lcp.echoid, 4, &nmagic);
4801         }
4802 out:
4803         SPPP_UNLOCK(sp);
4804         callout_reset(&sp->keepalive_callout, hz * 10, sppp_keepalive,
4805                       (void *)sp);
4806 }
4807
4808 /*
4809  * Get both IP addresses.
4810  */
4811 void
4812 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
4813 {
4814         struct epoch_tracker et;
4815         struct ifnet *ifp = SP2IFP(sp);
4816         struct ifaddr *ifa;
4817         struct sockaddr_in *si, *sm;
4818         u_long ssrc, ddst;
4819
4820         sm = NULL;
4821         ssrc = ddst = 0L;
4822         /*
4823          * Pick the first AF_INET address from the list,
4824          * aliases don't make any sense on a p2p link anyway.
4825          */
4826         si = NULL;
4827         NET_EPOCH_ENTER(et);
4828         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4829                 if (ifa->ifa_addr->sa_family == AF_INET) {
4830                         si = (struct sockaddr_in *)ifa->ifa_addr;
4831                         sm = (struct sockaddr_in *)ifa->ifa_netmask;
4832                         if (si)
4833                                 break;
4834                 }
4835         if (ifa) {
4836                 if (si && si->sin_addr.s_addr) {
4837                         ssrc = si->sin_addr.s_addr;
4838                         if (srcmask)
4839                                 *srcmask = ntohl(sm->sin_addr.s_addr);
4840                 }
4841
4842                 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
4843                 if (si && si->sin_addr.s_addr)
4844                         ddst = si->sin_addr.s_addr;
4845         }
4846         NET_EPOCH_EXIT(et);
4847
4848         if (dst) *dst = ntohl(ddst);
4849         if (src) *src = ntohl(ssrc);
4850 }
4851
4852 #ifdef INET
4853 /*
4854  * Set my IP address.
4855  */
4856 static void
4857 sppp_set_ip_addr(struct sppp *sp, u_long src)
4858 {
4859         STDDCL;
4860         struct epoch_tracker et;
4861         struct ifaddr *ifa;
4862         struct sockaddr_in *si;
4863         struct in_ifaddr *ia;
4864
4865         /*
4866          * Pick the first AF_INET address from the list,
4867          * aliases don't make any sense on a p2p link anyway.
4868          */
4869         si = NULL;
4870         NET_EPOCH_ENTER(et);
4871         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
4872                 if (ifa->ifa_addr->sa_family == AF_INET) {
4873                         si = (struct sockaddr_in *)ifa->ifa_addr;
4874                         if (si != NULL) {
4875                                 ifa_ref(ifa);
4876                                 break;
4877                         }
4878                 }
4879         }
4880         NET_EPOCH_EXIT(et);
4881
4882         if (ifa != NULL) {
4883                 int error;
4884
4885                 /* delete old route */
4886                 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST);
4887                 if (debug && error) {
4888                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
4889                                 SPP_ARGS(ifp), error);
4890                 }
4891
4892                 /* set new address */
4893                 si->sin_addr.s_addr = htonl(src);
4894                 ia = ifatoia(ifa);
4895                 IN_IFADDR_WLOCK();
4896                 LIST_REMOVE(ia, ia_hash);
4897                 LIST_INSERT_HEAD(INADDR_HASH(si->sin_addr.s_addr), ia, ia_hash);
4898                 IN_IFADDR_WUNLOCK();
4899
4900                 /* add new route */
4901                 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST);
4902                 if (debug && error) {
4903                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
4904                                 SPP_ARGS(ifp), error);
4905                 }
4906                 ifa_free(ifa);
4907         }
4908 }
4909 #endif
4910
4911 #ifdef INET6
4912 /*
4913  * Get both IPv6 addresses.
4914  */
4915 static void
4916 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst,
4917                    struct in6_addr *srcmask)
4918 {
4919         struct epoch_tracker et;
4920         struct ifnet *ifp = SP2IFP(sp);
4921         struct ifaddr *ifa;
4922         struct sockaddr_in6 *si, *sm;
4923         struct in6_addr ssrc, ddst;
4924
4925         sm = NULL;
4926         bzero(&ssrc, sizeof(ssrc));
4927         bzero(&ddst, sizeof(ddst));
4928         /*
4929          * Pick the first link-local AF_INET6 address from the list,
4930          * aliases don't make any sense on a p2p link anyway.
4931          */
4932         si = NULL;
4933         NET_EPOCH_ENTER(et);
4934         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4935                 if (ifa->ifa_addr->sa_family == AF_INET6) {
4936                         si = (struct sockaddr_in6 *)ifa->ifa_addr;
4937                         sm = (struct sockaddr_in6 *)ifa->ifa_netmask;
4938                         if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr))
4939                                 break;
4940                 }
4941         if (ifa) {
4942                 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) {
4943                         bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc));
4944                         if (srcmask) {
4945                                 bcopy(&sm->sin6_addr, srcmask,
4946                                       sizeof(*srcmask));
4947                         }
4948                 }
4949
4950                 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
4951                 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr))
4952                         bcopy(&si->sin6_addr, &ddst, sizeof(ddst));
4953         }
4954
4955         if (dst)
4956                 bcopy(&ddst, dst, sizeof(*dst));
4957         if (src)
4958                 bcopy(&ssrc, src, sizeof(*src));
4959         NET_EPOCH_EXIT(et);
4960 }
4961
4962 #ifdef IPV6CP_MYIFID_DYN
4963 /*
4964  * Generate random ifid.
4965  */
4966 static void
4967 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr)
4968 {
4969         /* TBD */
4970 }
4971
4972 /*
4973  * Set my IPv6 address.
4974  */
4975 static void
4976 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src)
4977 {
4978         STDDCL;
4979         struct epoch_tracker et;
4980         struct ifaddr *ifa;
4981         struct sockaddr_in6 *sin6;
4982
4983         /*
4984          * Pick the first link-local AF_INET6 address from the list,
4985          * aliases don't make any sense on a p2p link anyway.
4986          */
4987
4988         sin6 = NULL;
4989         NET_EPOCH_ENTER(et);
4990         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
4991                 if (ifa->ifa_addr->sa_family == AF_INET6) {
4992                         sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
4993                         if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
4994                                 ifa_ref(ifa);
4995                                 break;
4996                         }
4997                 }
4998         }
4999         NET_EPOCH_EXIT(et);
5000
5001         if (ifa != NULL) {
5002                 int error;
5003                 struct sockaddr_in6 new_sin6 = *sin6;
5004
5005                 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr));
5006                 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1);
5007                 if (debug && error) {
5008                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit "
5009                             " failed, error=%d\n", SPP_ARGS(ifp), error);
5010                 }
5011                 ifa_free(ifa);
5012         }
5013 }
5014 #endif
5015
5016 /*
5017  * Suggest a candidate address to be used by peer.
5018  */
5019 static void
5020 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest)
5021 {
5022         struct in6_addr myaddr;
5023         struct timeval tv;
5024
5025         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
5026
5027         myaddr.s6_addr[8] &= ~0x02;     /* u bit to "local" */
5028         microtime(&tv);
5029         if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) {
5030                 myaddr.s6_addr[14] ^= 0xff;
5031                 myaddr.s6_addr[15] ^= 0xff;
5032         } else {
5033                 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff);
5034                 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff);
5035         }
5036         if (suggest)
5037                 bcopy(&myaddr, suggest, sizeof(myaddr));
5038 }
5039 #endif /*INET6*/
5040
5041 static int
5042 sppp_params(struct sppp *sp, u_long cmd, void *data)
5043 {
5044         u_long subcmd;
5045         struct ifreq *ifr = (struct ifreq *)data;
5046         struct spppreq *spr;
5047         int rv = 0;
5048
5049         if ((spr = malloc(sizeof(struct spppreq), M_TEMP, M_NOWAIT)) == NULL)
5050                 return (EAGAIN);
5051         /*
5052          * ifr_data_get_ptr(ifr) is supposed to point to a struct spppreq.
5053          * Check the cmd word first before attempting to fetch all the
5054          * data.
5055          */
5056         rv = fueword(ifr_data_get_ptr(ifr), &subcmd);
5057         if (rv == -1) {
5058                 rv = EFAULT;
5059                 goto quit;
5060         }
5061
5062         if (copyin(ifr_data_get_ptr(ifr), spr, sizeof(struct spppreq)) != 0) {
5063                 rv = EFAULT;
5064                 goto quit;
5065         }
5066
5067         switch (subcmd) {
5068         case (u_long)SPPPIOGDEFS:
5069                 if (cmd != SIOCGIFGENERIC) {
5070                         rv = EINVAL;
5071                         break;
5072                 }
5073                 /*
5074                  * We copy over the entire current state, but clean
5075                  * out some of the stuff we don't wanna pass up.
5076                  * Remember, SIOCGIFGENERIC is unprotected, and can be
5077                  * called by any user.  No need to ever get PAP or
5078                  * CHAP secrets back to userland anyway.
5079                  */
5080                 spr->defs.pp_phase = sp->pp_phase;
5081                 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0;
5082                 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0;
5083                 spr->defs.lcp = sp->lcp;
5084                 spr->defs.ipcp = sp->ipcp;
5085                 spr->defs.ipv6cp = sp->ipv6cp;
5086                 spr->defs.myauth = sp->myauth;
5087                 spr->defs.hisauth = sp->hisauth;
5088                 bzero(spr->defs.myauth.secret, AUTHKEYLEN);
5089                 bzero(spr->defs.myauth.challenge, AUTHKEYLEN);
5090                 bzero(spr->defs.hisauth.secret, AUTHKEYLEN);
5091                 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN);
5092                 /*
5093                  * Fixup the LCP timeout value to milliseconds so
5094                  * spppcontrol doesn't need to bother about the value
5095                  * of "hz".  We do the reverse calculation below when
5096                  * setting it.
5097                  */
5098                 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz;
5099                 rv = copyout(spr, ifr_data_get_ptr(ifr),
5100                     sizeof(struct spppreq));
5101                 break;
5102
5103         case (u_long)SPPPIOSDEFS:
5104                 if (cmd != SIOCSIFGENERIC) {
5105                         rv = EINVAL;
5106                         break;
5107                 }
5108                 /*
5109                  * We have a very specific idea of which fields we
5110                  * allow being passed back from userland, so to not
5111                  * clobber our current state.  For one, we only allow
5112                  * setting anything if LCP is in dead or establish
5113                  * phase.  Once the authentication negotiations
5114                  * started, the authentication settings must not be
5115                  * changed again.  (The administrator can force an
5116                  * ifconfig down in order to get LCP back into dead
5117                  * phase.)
5118                  *
5119                  * Also, we only allow for authentication parameters to be
5120                  * specified.
5121                  *
5122                  * XXX Should allow to set or clear pp_flags.
5123                  *
5124                  * Finally, if the respective authentication protocol to
5125                  * be used is set differently than 0, but the secret is
5126                  * passed as all zeros, we don't trash the existing secret.
5127                  * This allows an administrator to change the system name
5128                  * only without clobbering the secret (which he didn't get
5129                  * back in a previous SPPPIOGDEFS call).  However, the
5130                  * secrets are cleared if the authentication protocol is
5131                  * reset to 0.  */
5132                 if (sp->pp_phase != PHASE_DEAD &&
5133                     sp->pp_phase != PHASE_ESTABLISH) {
5134                         rv = EBUSY;
5135                         break;
5136                 }
5137
5138                 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP &&
5139                      spr->defs.myauth.proto != PPP_CHAP) ||
5140                     (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP &&
5141                      spr->defs.hisauth.proto != PPP_CHAP)) {
5142                         rv = EINVAL;
5143                         break;
5144                 }
5145
5146                 if (spr->defs.myauth.proto == 0)
5147                         /* resetting myauth */
5148                         bzero(&sp->myauth, sizeof sp->myauth);
5149                 else {
5150                         /* setting/changing myauth */
5151                         sp->myauth.proto = spr->defs.myauth.proto;
5152                         bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
5153                         if (spr->defs.myauth.secret[0] != '\0')
5154                                 bcopy(spr->defs.myauth.secret, sp->myauth.secret,
5155                                       AUTHKEYLEN);
5156                 }
5157                 if (spr->defs.hisauth.proto == 0)
5158                         /* resetting hisauth */
5159                         bzero(&sp->hisauth, sizeof sp->hisauth);
5160                 else {
5161                         /* setting/changing hisauth */
5162                         sp->hisauth.proto = spr->defs.hisauth.proto;
5163                         sp->hisauth.flags = spr->defs.hisauth.flags;
5164                         bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
5165                         if (spr->defs.hisauth.secret[0] != '\0')
5166                                 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret,
5167                                       AUTHKEYLEN);
5168                 }
5169                 /* set LCP restart timer timeout */
5170                 if (spr->defs.lcp.timeout != 0)
5171                         sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000;
5172                 /* set VJ enable and IPv6 disable flags */
5173 #ifdef INET
5174                 if (spr->defs.enable_vj)
5175                         sp->confflags |= CONF_ENABLE_VJ;
5176                 else
5177                         sp->confflags &= ~CONF_ENABLE_VJ;
5178 #endif
5179 #ifdef INET6
5180                 if (spr->defs.enable_ipv6)
5181                         sp->confflags |= CONF_ENABLE_IPV6;
5182                 else
5183                         sp->confflags &= ~CONF_ENABLE_IPV6;
5184 #endif
5185                 break;
5186
5187         default:
5188                 rv = EINVAL;
5189         }
5190
5191  quit:
5192         free(spr, M_TEMP);
5193
5194         return (rv);
5195 }
5196
5197 static void
5198 sppp_phase_network(struct sppp *sp)
5199 {
5200         STDDCL;
5201         int i;
5202         u_long mask;
5203
5204         sp->pp_phase = PHASE_NETWORK;
5205
5206         if (debug)
5207                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
5208                     sppp_phase_name(sp->pp_phase));
5209
5210         /* Notify NCPs now. */
5211         for (i = 0; i < IDX_COUNT; i++)
5212                 if ((cps[i])->flags & CP_NCP)
5213                         (cps[i])->Open(sp);
5214
5215         /* Send Up events to all NCPs. */
5216         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
5217                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP))
5218                         (cps[i])->Up(sp);
5219
5220         /* if no NCP is starting, all this was in vain, close down */
5221         sppp_lcp_check_and_close(sp);
5222 }
5223
5224 static const char *
5225 sppp_cp_type_name(u_char type)
5226 {
5227         static char buf[12];
5228         switch (type) {
5229         case CONF_REQ:   return "conf-req";
5230         case CONF_ACK:   return "conf-ack";
5231         case CONF_NAK:   return "conf-nak";
5232         case CONF_REJ:   return "conf-rej";
5233         case TERM_REQ:   return "term-req";
5234         case TERM_ACK:   return "term-ack";
5235         case CODE_REJ:   return "code-rej";
5236         case PROTO_REJ:  return "proto-rej";
5237         case ECHO_REQ:   return "echo-req";
5238         case ECHO_REPLY: return "echo-reply";
5239         case DISC_REQ:   return "discard-req";
5240         }
5241         snprintf (buf, sizeof(buf), "cp/0x%x", type);
5242         return buf;
5243 }
5244
5245 static const char *
5246 sppp_auth_type_name(u_short proto, u_char type)
5247 {
5248         static char buf[12];
5249         switch (proto) {
5250         case PPP_CHAP:
5251                 switch (type) {
5252                 case CHAP_CHALLENGE:    return "challenge";
5253                 case CHAP_RESPONSE:     return "response";
5254                 case CHAP_SUCCESS:      return "success";
5255                 case CHAP_FAILURE:      return "failure";
5256                 }
5257         case PPP_PAP:
5258                 switch (type) {
5259                 case PAP_REQ:           return "req";
5260                 case PAP_ACK:           return "ack";
5261                 case PAP_NAK:           return "nak";
5262                 }
5263         }
5264         snprintf (buf, sizeof(buf), "auth/0x%x", type);
5265         return buf;
5266 }
5267
5268 static const char *
5269 sppp_lcp_opt_name(u_char opt)
5270 {
5271         static char buf[12];
5272         switch (opt) {
5273         case LCP_OPT_MRU:               return "mru";
5274         case LCP_OPT_ASYNC_MAP:         return "async-map";
5275         case LCP_OPT_AUTH_PROTO:        return "auth-proto";
5276         case LCP_OPT_QUAL_PROTO:        return "qual-proto";
5277         case LCP_OPT_MAGIC:             return "magic";
5278         case LCP_OPT_PROTO_COMP:        return "proto-comp";
5279         case LCP_OPT_ADDR_COMP:         return "addr-comp";
5280         }
5281         snprintf (buf, sizeof(buf), "lcp/0x%x", opt);
5282         return buf;
5283 }
5284
5285 #ifdef INET
5286 static const char *
5287 sppp_ipcp_opt_name(u_char opt)
5288 {
5289         static char buf[12];
5290         switch (opt) {
5291         case IPCP_OPT_ADDRESSES:        return "addresses";
5292         case IPCP_OPT_COMPRESSION:      return "compression";
5293         case IPCP_OPT_ADDRESS:          return "address";
5294         }
5295         snprintf (buf, sizeof(buf), "ipcp/0x%x", opt);
5296         return buf;
5297 }
5298 #endif
5299
5300 #ifdef INET6
5301 static const char *
5302 sppp_ipv6cp_opt_name(u_char opt)
5303 {
5304         static char buf[12];
5305         switch (opt) {
5306         case IPV6CP_OPT_IFID:           return "ifid";
5307         case IPV6CP_OPT_COMPRESSION:    return "compression";
5308         }
5309         sprintf (buf, "0x%x", opt);
5310         return buf;
5311 }
5312 #endif
5313
5314 static const char *
5315 sppp_state_name(int state)
5316 {
5317         switch (state) {
5318         case STATE_INITIAL:     return "initial";
5319         case STATE_STARTING:    return "starting";
5320         case STATE_CLOSED:      return "closed";
5321         case STATE_STOPPED:     return "stopped";
5322         case STATE_CLOSING:     return "closing";
5323         case STATE_STOPPING:    return "stopping";
5324         case STATE_REQ_SENT:    return "req-sent";
5325         case STATE_ACK_RCVD:    return "ack-rcvd";
5326         case STATE_ACK_SENT:    return "ack-sent";
5327         case STATE_OPENED:      return "opened";
5328         }
5329         return "illegal";
5330 }
5331
5332 static const char *
5333 sppp_phase_name(enum ppp_phase phase)
5334 {
5335         switch (phase) {
5336         case PHASE_DEAD:        return "dead";
5337         case PHASE_ESTABLISH:   return "establish";
5338         case PHASE_TERMINATE:   return "terminate";
5339         case PHASE_AUTHENTICATE: return "authenticate";
5340         case PHASE_NETWORK:     return "network";
5341         }
5342         return "illegal";
5343 }
5344
5345 static const char *
5346 sppp_proto_name(u_short proto)
5347 {
5348         static char buf[12];
5349         switch (proto) {
5350         case PPP_LCP:   return "lcp";
5351         case PPP_IPCP:  return "ipcp";
5352         case PPP_PAP:   return "pap";
5353         case PPP_CHAP:  return "chap";
5354         case PPP_IPV6CP: return "ipv6cp";
5355         }
5356         snprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto);
5357         return buf;
5358 }
5359
5360 static void
5361 sppp_print_bytes(const u_char *p, u_short len)
5362 {
5363         if (len)
5364                 log(-1, " %*D", len, p, "-");
5365 }
5366
5367 static void
5368 sppp_print_string(const char *p, u_short len)
5369 {
5370         u_char c;
5371
5372         while (len-- > 0) {
5373                 c = *p++;
5374                 /*
5375                  * Print only ASCII chars directly.  RFC 1994 recommends
5376                  * using only them, but we don't rely on it.  */
5377                 if (c < ' ' || c > '~')
5378                         log(-1, "\\x%x", c);
5379                 else
5380                         log(-1, "%c", c);
5381         }
5382 }
5383
5384 #ifdef INET
5385 static const char *
5386 sppp_dotted_quad(u_long addr)
5387 {
5388         static char s[16];
5389         sprintf(s, "%d.%d.%d.%d",
5390                 (int)((addr >> 24) & 0xff),
5391                 (int)((addr >> 16) & 0xff),
5392                 (int)((addr >> 8) & 0xff),
5393                 (int)(addr & 0xff));
5394         return s;
5395 }
5396 #endif
5397
5398 static int
5399 sppp_strnlen(u_char *p, int max)
5400 {
5401         int len;
5402
5403         for (len = 0; len < max && *p; ++p)
5404                 ++len;
5405         return len;
5406 }
5407
5408 /* a dummy, used to drop uninteresting events */
5409 static void
5410 sppp_null(struct sppp *unused)
5411 {
5412         /* do just nothing */
5413 }