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         if (!callout_drain(&sp->keepalive_callout))
1064                 callout_stop(&sp->keepalive_callout);
1065
1066         for (i = 0; i < IDX_COUNT; i++) {
1067                 if (!callout_drain(&sp->ch[i]))
1068                         callout_stop(&sp->ch[i]);
1069         }
1070         if (!callout_drain(&sp->pap_my_to_ch))
1071                 callout_stop(&sp->pap_my_to_ch);
1072         mtx_destroy(&sp->pp_cpq.ifq_mtx);
1073         mtx_destroy(&sp->pp_fastq.ifq_mtx);
1074         mtx_destroy(&sp->mtx);
1075 }
1076
1077 /*
1078  * Flush the interface output queue.
1079  */
1080 static void
1081 sppp_flush_unlocked(struct ifnet *ifp)
1082 {
1083         struct sppp *sp = IFP2SP(ifp);
1084
1085         sppp_qflush ((struct ifqueue *)&SP2IFP(sp)->if_snd);
1086         sppp_qflush (&sp->pp_fastq);
1087         sppp_qflush (&sp->pp_cpq);
1088 }
1089
1090 void
1091 sppp_flush(struct ifnet *ifp)
1092 {
1093         struct sppp *sp = IFP2SP(ifp);
1094
1095         SPPP_LOCK(sp);
1096         sppp_flush_unlocked (ifp);
1097         SPPP_UNLOCK(sp);
1098 }
1099
1100 /*
1101  * Check if the output queue is empty.
1102  */
1103 int
1104 sppp_isempty(struct ifnet *ifp)
1105 {
1106         struct sppp *sp = IFP2SP(ifp);
1107         int empty;
1108
1109         SPPP_LOCK(sp);
1110         empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head &&
1111                 !SP2IFP(sp)->if_snd.ifq_head;
1112         SPPP_UNLOCK(sp);
1113         return (empty);
1114 }
1115
1116 /*
1117  * Get next packet to send.
1118  */
1119 struct mbuf *
1120 sppp_dequeue(struct ifnet *ifp)
1121 {
1122         struct sppp *sp = IFP2SP(ifp);
1123         struct mbuf *m;
1124
1125         SPPP_LOCK(sp);
1126         /*
1127          * Process only the control protocol queue until we have at
1128          * least one NCP open.
1129          *
1130          * Do always serve all three queues in Cisco mode.
1131          */
1132         IF_DEQUEUE(&sp->pp_cpq, m);
1133         if (m == NULL &&
1134             (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO ||
1135              sp->pp_mode == PP_FR)) {
1136                 IF_DEQUEUE(&sp->pp_fastq, m);
1137                 if (m == NULL)
1138                         IF_DEQUEUE (&SP2IFP(sp)->if_snd, m);
1139         }
1140         SPPP_UNLOCK(sp);
1141         return m;
1142 }
1143
1144 /*
1145  * Pick the next packet, do not remove it from the queue.
1146  */
1147 struct mbuf *
1148 sppp_pick(struct ifnet *ifp)
1149 {
1150         struct sppp *sp = IFP2SP(ifp);
1151         struct mbuf *m;
1152
1153         SPPP_LOCK(sp);
1154
1155         m = sp->pp_cpq.ifq_head;
1156         if (m == NULL &&
1157             (sp->pp_phase == PHASE_NETWORK ||
1158              sp->pp_mode == IFF_CISCO ||
1159              sp->pp_mode == PP_FR))
1160                 if ((m = sp->pp_fastq.ifq_head) == NULL)
1161                         m = SP2IFP(sp)->if_snd.ifq_head;
1162         SPPP_UNLOCK(sp);
1163         return (m);
1164 }
1165
1166 /*
1167  * Process an ioctl request.  Called on low priority level.
1168  */
1169 int
1170 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
1171 {
1172         struct ifreq *ifr = (struct ifreq*) data;
1173         struct sppp *sp = IFP2SP(ifp);
1174         int rv, going_up, going_down, newmode;
1175
1176         SPPP_LOCK(sp);
1177         rv = 0;
1178         switch (cmd) {
1179         case SIOCAIFADDR:
1180                 break;
1181
1182         case SIOCSIFADDR:
1183                 /* set the interface "up" when assigning an IP address */
1184                 ifp->if_flags |= IFF_UP;
1185                 /* FALLTHROUGH */
1186
1187         case SIOCSIFFLAGS:
1188                 going_up = ifp->if_flags & IFF_UP &&
1189                         (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0;
1190                 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1191                         ifp->if_drv_flags & IFF_DRV_RUNNING;
1192
1193                 newmode = ifp->if_flags & IFF_PASSIVE;
1194                 if (!newmode)
1195                         newmode = ifp->if_flags & IFF_AUTO;
1196                 if (!newmode)
1197                         newmode = ifp->if_flags & IFF_CISCO;
1198                 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
1199                 ifp->if_flags |= newmode;
1200
1201                 if (!newmode)
1202                         newmode = sp->pp_flags & PP_FR;
1203
1204                 if (newmode != sp->pp_mode) {
1205                         going_down = 1;
1206                         if (!going_up)
1207                                 going_up = ifp->if_drv_flags & IFF_DRV_RUNNING;
1208                 }
1209
1210                 if (going_down) {
1211                         if (sp->pp_mode != IFF_CISCO &&
1212                             sp->pp_mode != PP_FR)
1213                                 lcp.Close(sp);
1214                         else if (sp->pp_tlf)
1215                                 (sp->pp_tlf)(sp);
1216                         sppp_flush_unlocked(ifp);
1217                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1218                         sp->pp_mode = newmode;
1219                 }
1220
1221                 if (going_up) {
1222                         if (sp->pp_mode != IFF_CISCO &&
1223                             sp->pp_mode != PP_FR)
1224                                 lcp.Close(sp);
1225                         sp->pp_mode = newmode;
1226                         if (sp->pp_mode == 0) {
1227                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1228                                 lcp.Open(sp);
1229                         }
1230                         if ((sp->pp_mode == IFF_CISCO) ||
1231                             (sp->pp_mode == PP_FR)) {
1232                                 if (sp->pp_tls)
1233                                         (sp->pp_tls)(sp);
1234                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1235                         }
1236                 }
1237
1238                 break;
1239
1240 #ifdef SIOCSIFMTU
1241 #ifndef ifr_mtu
1242 #define ifr_mtu ifr_metric
1243 #endif
1244         case SIOCSIFMTU:
1245                 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
1246                         return (EINVAL);
1247                 ifp->if_mtu = ifr->ifr_mtu;
1248                 break;
1249 #endif
1250 #ifdef SLIOCSETMTU
1251         case SLIOCSETMTU:
1252                 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
1253                         return (EINVAL);
1254                 ifp->if_mtu = *(short*)data;
1255                 break;
1256 #endif
1257 #ifdef SIOCGIFMTU
1258         case SIOCGIFMTU:
1259                 ifr->ifr_mtu = ifp->if_mtu;
1260                 break;
1261 #endif
1262 #ifdef SLIOCGETMTU
1263         case SLIOCGETMTU:
1264                 *(short*)data = ifp->if_mtu;
1265                 break;
1266 #endif
1267         case SIOCADDMULTI:
1268         case SIOCDELMULTI:
1269                 break;
1270
1271         case SIOCGIFGENERIC:
1272         case SIOCSIFGENERIC:
1273                 rv = sppp_params(sp, cmd, data);
1274                 break;
1275
1276         default:
1277                 rv = ENOTTY;
1278         }
1279         SPPP_UNLOCK(sp);
1280         return rv;
1281 }
1282
1283 /*
1284  * Cisco framing implementation.
1285  */
1286
1287 /*
1288  * Handle incoming Cisco keepalive protocol packets.
1289  */
1290 static void
1291 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1292 {
1293         STDDCL;
1294         struct cisco_packet *h;
1295         u_long me, mymask;
1296
1297         if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1298                 if (debug)
1299                         log(LOG_DEBUG,
1300                             SPP_FMT "cisco invalid packet length: %d bytes\n",
1301                             SPP_ARGS(ifp), m->m_pkthdr.len);
1302                 return;
1303         }
1304         h = mtod (m, struct cisco_packet*);
1305         if (debug)
1306                 log(LOG_DEBUG,
1307                     SPP_FMT "cisco input: %d bytes "
1308                     "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1309                     SPP_ARGS(ifp), m->m_pkthdr.len,
1310                     (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
1311                     (u_int)h->time0, (u_int)h->time1);
1312         switch (ntohl (h->type)) {
1313         default:
1314                 if (debug)
1315                         log(-1, SPP_FMT "cisco unknown packet type: 0x%lx\n",
1316                                SPP_ARGS(ifp), (u_long)ntohl (h->type));
1317                 break;
1318         case CISCO_ADDR_REPLY:
1319                 /* Reply on address request, ignore */
1320                 break;
1321         case CISCO_KEEPALIVE_REQ:
1322                 sp->pp_alivecnt = 0;
1323                 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
1324                 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1325                         /* Local and remote sequence numbers are equal.
1326                          * Probably, the line is in loopback mode. */
1327                         if (sp->pp_loopcnt >= MAXALIVECNT) {
1328                                 printf (SPP_FMT "loopback\n",
1329                                         SPP_ARGS(ifp));
1330                                 sp->pp_loopcnt = 0;
1331                                 if (ifp->if_flags & IFF_UP) {
1332                                         if_down (ifp);
1333                                         sppp_qflush (&sp->pp_cpq);
1334                                 }
1335                         }
1336                         ++sp->pp_loopcnt;
1337
1338                         /* Generate new local sequence number */
1339                         sp->pp_seq[IDX_LCP] = random();
1340                         break;
1341                 }
1342                 sp->pp_loopcnt = 0;
1343                 if (! (ifp->if_flags & IFF_UP) &&
1344                     (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
1345                         if_up(ifp);
1346                         printf (SPP_FMT "up\n", SPP_ARGS(ifp));
1347                 }
1348                 break;
1349         case CISCO_ADDR_REQ:
1350                 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1351                 if (me != 0L)
1352                         sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1353                 break;
1354         }
1355 }
1356
1357 /*
1358  * Send Cisco keepalive packet.
1359  */
1360 static void
1361 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1362 {
1363         STDDCL;
1364         struct ppp_header *h;
1365         struct cisco_packet *ch;
1366         struct mbuf *m;
1367         struct timeval tv;
1368
1369         getmicrouptime(&tv);
1370
1371         MGETHDR (m, M_NOWAIT, MT_DATA);
1372         if (! m)
1373                 return;
1374         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1375         m->m_pkthdr.rcvif = 0;
1376
1377         h = mtod (m, struct ppp_header*);
1378         h->address = CISCO_MULTICAST;
1379         h->control = 0;
1380         h->protocol = htons (CISCO_KEEPALIVE);
1381
1382         ch = (struct cisco_packet*) (h + 1);
1383         ch->type = htonl (type);
1384         ch->par1 = htonl (par1);
1385         ch->par2 = htonl (par2);
1386         ch->rel = -1;
1387
1388         ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1389         ch->time1 = htons ((u_short) tv.tv_sec);
1390
1391         if (debug)
1392                 log(LOG_DEBUG,
1393                     SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1394                         SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
1395                         (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1396
1397         if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
1398                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1399 }
1400
1401 /*
1402  * PPP protocol implementation.
1403  */
1404
1405 /*
1406  * Send PPP control protocol packet.
1407  */
1408 static void
1409 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1410              u_char ident, u_short len, void *data)
1411 {
1412         STDDCL;
1413         struct ppp_header *h;
1414         struct lcp_header *lh;
1415         struct mbuf *m;
1416
1417         if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1418                 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1419         MGETHDR (m, M_NOWAIT, MT_DATA);
1420         if (! m)
1421                 return;
1422         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1423         m->m_pkthdr.rcvif = 0;
1424
1425         h = mtod (m, struct ppp_header*);
1426         h->address = PPP_ALLSTATIONS;        /* broadcast address */
1427         h->control = PPP_UI;                 /* Unnumbered Info */
1428         h->protocol = htons (proto);         /* Link Control Protocol */
1429
1430         lh = (struct lcp_header*) (h + 1);
1431         lh->type = type;
1432         lh->ident = ident;
1433         lh->len = htons (LCP_HEADER_LEN + len);
1434         if (len)
1435                 bcopy (data, lh+1, len);
1436
1437         if (debug) {
1438                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1439                     SPP_ARGS(ifp),
1440                     sppp_proto_name(proto),
1441                     sppp_cp_type_name (lh->type), lh->ident,
1442                     ntohs (lh->len));
1443                 sppp_print_bytes ((u_char*) (lh+1), len);
1444                 log(-1, ">\n");
1445         }
1446         if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
1447                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1448 }
1449
1450 /*
1451  * Handle incoming PPP control protocol packets.
1452  */
1453 static void
1454 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1455 {
1456         STDDCL;
1457         struct lcp_header *h;
1458         int len = m->m_pkthdr.len;
1459         int rv;
1460         u_char *p;
1461
1462         if (len < 4) {
1463                 if (debug)
1464                         log(LOG_DEBUG,
1465                             SPP_FMT "%s invalid packet length: %d bytes\n",
1466                             SPP_ARGS(ifp), cp->name, len);
1467                 return;
1468         }
1469         h = mtod (m, struct lcp_header*);
1470         if (debug) {
1471                 log(LOG_DEBUG,
1472                     SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1473                     SPP_ARGS(ifp), cp->name,
1474                     sppp_state_name(sp->state[cp->protoidx]),
1475                     sppp_cp_type_name (h->type), h->ident, ntohs (h->len));
1476                 sppp_print_bytes ((u_char*) (h+1), len-4);
1477                 log(-1, ">\n");
1478         }
1479         if (len > ntohs (h->len))
1480                 len = ntohs (h->len);
1481         p = (u_char *)(h + 1);
1482         switch (h->type) {
1483         case CONF_REQ:
1484                 if (len < 4) {
1485                         if (debug)
1486                                 log(-1, SPP_FMT "%s invalid conf-req length %d\n",
1487                                        SPP_ARGS(ifp), cp->name,
1488                                        len);
1489                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1490                         break;
1491                 }
1492                 /* handle states where RCR doesn't get a SCA/SCN */
1493                 switch (sp->state[cp->protoidx]) {
1494                 case STATE_CLOSING:
1495                 case STATE_STOPPING:
1496                         return;
1497                 case STATE_CLOSED:
1498                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1499                                      0, 0);
1500                         return;
1501                 }
1502                 rv = (cp->RCR)(sp, h, len);
1503                 switch (sp->state[cp->protoidx]) {
1504                 case STATE_OPENED:
1505                         (cp->tld)(sp);
1506                         (cp->scr)(sp);
1507                         /* FALLTHROUGH */
1508                 case STATE_ACK_SENT:
1509                 case STATE_REQ_SENT:
1510                         /*
1511                          * sppp_cp_change_state() have the side effect of
1512                          * restarting the timeouts. We want to avoid that
1513                          * if the state don't change, otherwise we won't
1514                          * ever timeout and resend a configuration request
1515                          * that got lost.
1516                          */
1517                         if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
1518                             STATE_REQ_SENT))
1519                                 break;
1520                         sppp_cp_change_state(cp, sp, rv?
1521                                              STATE_ACK_SENT: STATE_REQ_SENT);
1522                         break;
1523                 case STATE_STOPPED:
1524                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1525                         (cp->scr)(sp);
1526                         sppp_cp_change_state(cp, sp, rv?
1527                                              STATE_ACK_SENT: STATE_REQ_SENT);
1528                         break;
1529                 case STATE_ACK_RCVD:
1530                         if (rv) {
1531                                 sppp_cp_change_state(cp, sp, STATE_OPENED);
1532                                 if (debug)
1533                                         log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1534                                             SPP_ARGS(ifp),
1535                                             cp->name);
1536                                 (cp->tlu)(sp);
1537                         } else
1538                                 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1539                         break;
1540                 default:
1541                         printf(SPP_FMT "%s illegal %s in state %s\n",
1542                                SPP_ARGS(ifp), cp->name,
1543                                sppp_cp_type_name(h->type),
1544                                sppp_state_name(sp->state[cp->protoidx]));
1545                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1546                 }
1547                 break;
1548         case CONF_ACK:
1549                 if (h->ident != sp->confid[cp->protoidx]) {
1550                         if (debug)
1551                                 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1552                                        SPP_ARGS(ifp), cp->name,
1553                                        h->ident, sp->confid[cp->protoidx]);
1554                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1555                         break;
1556                 }
1557                 switch (sp->state[cp->protoidx]) {
1558                 case STATE_CLOSED:
1559                 case STATE_STOPPED:
1560                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1561                         break;
1562                 case STATE_CLOSING:
1563                 case STATE_STOPPING:
1564                         break;
1565                 case STATE_REQ_SENT:
1566                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1567                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1568                         break;
1569                 case STATE_OPENED:
1570                         (cp->tld)(sp);
1571                         /* FALLTHROUGH */
1572                 case STATE_ACK_RCVD:
1573                         (cp->scr)(sp);
1574                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1575                         break;
1576                 case STATE_ACK_SENT:
1577                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1578                         sppp_cp_change_state(cp, sp, STATE_OPENED);
1579                         if (debug)
1580                                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1581                                        SPP_ARGS(ifp), cp->name);
1582                         (cp->tlu)(sp);
1583                         break;
1584                 default:
1585                         printf(SPP_FMT "%s illegal %s in state %s\n",
1586                                SPP_ARGS(ifp), cp->name,
1587                                sppp_cp_type_name(h->type),
1588                                sppp_state_name(sp->state[cp->protoidx]));
1589                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1590                 }
1591                 break;
1592         case CONF_NAK:
1593         case CONF_REJ:
1594                 if (h->ident != sp->confid[cp->protoidx]) {
1595                         if (debug)
1596                                 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1597                                        SPP_ARGS(ifp), cp->name,
1598                                        h->ident, sp->confid[cp->protoidx]);
1599                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1600                         break;
1601                 }
1602                 if (h->type == CONF_NAK)
1603                         (cp->RCN_nak)(sp, h, len);
1604                 else /* CONF_REJ */
1605                         (cp->RCN_rej)(sp, h, len);
1606
1607                 switch (sp->state[cp->protoidx]) {
1608                 case STATE_CLOSED:
1609                 case STATE_STOPPED:
1610                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1611                         break;
1612                 case STATE_REQ_SENT:
1613                 case STATE_ACK_SENT:
1614                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1615                         /*
1616                          * Slow things down a bit if we think we might be
1617                          * in loopback. Depend on the timeout to send the
1618                          * next configuration request.
1619                          */
1620                         if (sp->pp_loopcnt)
1621                                 break;
1622                         (cp->scr)(sp);
1623                         break;
1624                 case STATE_OPENED:
1625                         (cp->tld)(sp);
1626                         /* FALLTHROUGH */
1627                 case STATE_ACK_RCVD:
1628                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1629                         (cp->scr)(sp);
1630                         break;
1631                 case STATE_CLOSING:
1632                 case STATE_STOPPING:
1633                         break;
1634                 default:
1635                         printf(SPP_FMT "%s illegal %s in state %s\n",
1636                                SPP_ARGS(ifp), cp->name,
1637                                sppp_cp_type_name(h->type),
1638                                sppp_state_name(sp->state[cp->protoidx]));
1639                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1640                 }
1641                 break;
1642
1643         case TERM_REQ:
1644                 switch (sp->state[cp->protoidx]) {
1645                 case STATE_ACK_RCVD:
1646                 case STATE_ACK_SENT:
1647                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1648                         /* FALLTHROUGH */
1649                 case STATE_CLOSED:
1650                 case STATE_STOPPED:
1651                 case STATE_CLOSING:
1652                 case STATE_STOPPING:
1653                 case STATE_REQ_SENT:
1654                   sta:
1655                         /* Send Terminate-Ack packet. */
1656                         if (debug)
1657                                 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1658                                     SPP_ARGS(ifp), cp->name);
1659                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1660                         break;
1661                 case STATE_OPENED:
1662                         (cp->tld)(sp);
1663                         sp->rst_counter[cp->protoidx] = 0;
1664                         sppp_cp_change_state(cp, sp, STATE_STOPPING);
1665                         goto sta;
1666                         break;
1667                 default:
1668                         printf(SPP_FMT "%s illegal %s in state %s\n",
1669                                SPP_ARGS(ifp), cp->name,
1670                                sppp_cp_type_name(h->type),
1671                                sppp_state_name(sp->state[cp->protoidx]));
1672                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1673                 }
1674                 break;
1675         case TERM_ACK:
1676                 switch (sp->state[cp->protoidx]) {
1677                 case STATE_CLOSED:
1678                 case STATE_STOPPED:
1679                 case STATE_REQ_SENT:
1680                 case STATE_ACK_SENT:
1681                         break;
1682                 case STATE_CLOSING:
1683                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
1684                         (cp->tlf)(sp);
1685                         break;
1686                 case STATE_STOPPING:
1687                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
1688                         (cp->tlf)(sp);
1689                         break;
1690                 case STATE_ACK_RCVD:
1691                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1692                         break;
1693                 case STATE_OPENED:
1694                         (cp->tld)(sp);
1695                         (cp->scr)(sp);
1696                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1697                         break;
1698                 default:
1699                         printf(SPP_FMT "%s illegal %s in state %s\n",
1700                                SPP_ARGS(ifp), cp->name,
1701                                sppp_cp_type_name(h->type),
1702                                sppp_state_name(sp->state[cp->protoidx]));
1703                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1704                 }
1705                 break;
1706         case CODE_REJ:
1707                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1708                 log(LOG_INFO,
1709                     SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1710                     "danger will robinson\n",
1711                     SPP_ARGS(ifp), cp->name,
1712                     sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1713                 switch (sp->state[cp->protoidx]) {
1714                 case STATE_CLOSED:
1715                 case STATE_STOPPED:
1716                 case STATE_REQ_SENT:
1717                 case STATE_ACK_SENT:
1718                 case STATE_CLOSING:
1719                 case STATE_STOPPING:
1720                 case STATE_OPENED:
1721                         break;
1722                 case STATE_ACK_RCVD:
1723                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1724                         break;
1725                 default:
1726                         printf(SPP_FMT "%s illegal %s in state %s\n",
1727                                SPP_ARGS(ifp), cp->name,
1728                                sppp_cp_type_name(h->type),
1729                                sppp_state_name(sp->state[cp->protoidx]));
1730                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1731                 }
1732                 break;
1733         case PROTO_REJ:
1734             {
1735                 int catastrophic;
1736                 const struct cp *upper;
1737                 int i;
1738                 u_int16_t proto;
1739
1740                 catastrophic = 0;
1741                 upper = NULL;
1742                 proto = ntohs(*((u_int16_t *)p));
1743                 for (i = 0; i < IDX_COUNT; i++) {
1744                         if (cps[i]->proto == proto) {
1745                                 upper = cps[i];
1746                                 break;
1747                         }
1748                 }
1749                 if (upper == NULL)
1750                         catastrophic++;
1751
1752                 if (catastrophic || debug)
1753                         log(catastrophic? LOG_INFO: LOG_DEBUG,
1754                             SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1755                             SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
1756                             sppp_cp_type_name(h->type), proto,
1757                             upper ? upper->name : "unknown",
1758                             upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1759
1760                 /*
1761                  * if we got RXJ+ against conf-req, the peer does not implement
1762                  * this particular protocol type.  terminate the protocol.
1763                  */
1764                 if (upper && !catastrophic) {
1765                         if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1766                                 upper->Close(sp);
1767                                 break;
1768                         }
1769                 }
1770
1771                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1772                 switch (sp->state[cp->protoidx]) {
1773                 case STATE_CLOSED:
1774                 case STATE_STOPPED:
1775                 case STATE_REQ_SENT:
1776                 case STATE_ACK_SENT:
1777                 case STATE_CLOSING:
1778                 case STATE_STOPPING:
1779                 case STATE_OPENED:
1780                         break;
1781                 case STATE_ACK_RCVD:
1782                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1783                         break;
1784                 default:
1785                         printf(SPP_FMT "%s illegal %s in state %s\n",
1786                                SPP_ARGS(ifp), cp->name,
1787                                sppp_cp_type_name(h->type),
1788                                sppp_state_name(sp->state[cp->protoidx]));
1789                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1790                 }
1791                 break;
1792             }
1793         case DISC_REQ:
1794                 if (cp->proto != PPP_LCP)
1795                         goto illegal;
1796                 /* Discard the packet. */
1797                 break;
1798         case ECHO_REQ:
1799                 if (cp->proto != PPP_LCP)
1800                         goto illegal;
1801                 if (sp->state[cp->protoidx] != STATE_OPENED) {
1802                         if (debug)
1803                                 log(-1, SPP_FMT "lcp echo req but lcp closed\n",
1804                                        SPP_ARGS(ifp));
1805                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1806                         break;
1807                 }
1808                 if (len < 8) {
1809                         if (debug)
1810                                 log(-1, SPP_FMT "invalid lcp echo request "
1811                                        "packet length: %d bytes\n",
1812                                        SPP_ARGS(ifp), len);
1813                         break;
1814                 }
1815                 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
1816                     ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1817                         /* Line loopback mode detected. */
1818                         printf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1819                         sp->pp_loopcnt = MAXALIVECNT * 5;
1820                         if_down (ifp);
1821                         sppp_qflush (&sp->pp_cpq);
1822
1823                         /* Shut down the PPP link. */
1824                         /* XXX */
1825                         lcp.Down(sp);
1826                         lcp.Up(sp);
1827                         break;
1828                 }
1829                 *(long*)(h+1) = htonl (sp->lcp.magic);
1830                 if (debug)
1831                         log(-1, SPP_FMT "got lcp echo req, sending echo rep\n",
1832                                SPP_ARGS(ifp));
1833                 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1834                 break;
1835         case ECHO_REPLY:
1836                 if (cp->proto != PPP_LCP)
1837                         goto illegal;
1838                 if (h->ident != sp->lcp.echoid) {
1839                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1840                         break;
1841                 }
1842                 if (len < 8) {
1843                         if (debug)
1844                                 log(-1, SPP_FMT "lcp invalid echo reply "
1845                                        "packet length: %d bytes\n",
1846                                        SPP_ARGS(ifp), len);
1847                         break;
1848                 }
1849                 if (debug)
1850                         log(-1, SPP_FMT "lcp got echo rep\n",
1851                                SPP_ARGS(ifp));
1852                 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
1853                     ntohl (*(long*)(h+1)) != sp->lcp.magic)
1854                         sp->pp_alivecnt = 0;
1855                 break;
1856         default:
1857                 /* Unknown packet type -- send Code-Reject packet. */
1858           illegal:
1859                 if (debug)
1860                         log(-1, SPP_FMT "%s send code-rej for 0x%x\n",
1861                                SPP_ARGS(ifp), cp->name, h->type);
1862                 sppp_cp_send(sp, cp->proto, CODE_REJ,
1863                              ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1864                 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1865         }
1866 }
1867
1868
1869 /*
1870  * The generic part of all Up/Down/Open/Close/TO event handlers.
1871  * Basically, the state transition handling in the automaton.
1872  */
1873 static void
1874 sppp_up_event(const struct cp *cp, struct sppp *sp)
1875 {
1876         STDDCL;
1877
1878         if (debug)
1879                 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
1880                     SPP_ARGS(ifp), cp->name,
1881                     sppp_state_name(sp->state[cp->protoidx]));
1882
1883         switch (sp->state[cp->protoidx]) {
1884         case STATE_INITIAL:
1885                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1886                 break;
1887         case STATE_STARTING:
1888                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1889                 (cp->scr)(sp);
1890                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1891                 break;
1892         default:
1893                 printf(SPP_FMT "%s illegal up in state %s\n",
1894                        SPP_ARGS(ifp), cp->name,
1895                        sppp_state_name(sp->state[cp->protoidx]));
1896         }
1897 }
1898
1899 static void
1900 sppp_down_event(const struct cp *cp, struct sppp *sp)
1901 {
1902         STDDCL;
1903
1904         if (debug)
1905                 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
1906                     SPP_ARGS(ifp), cp->name,
1907                     sppp_state_name(sp->state[cp->protoidx]));
1908
1909         switch (sp->state[cp->protoidx]) {
1910         case STATE_CLOSED:
1911         case STATE_CLOSING:
1912                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1913                 break;
1914         case STATE_STOPPED:
1915                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1916                 (cp->tls)(sp);
1917                 break;
1918         case STATE_STOPPING:
1919         case STATE_REQ_SENT:
1920         case STATE_ACK_RCVD:
1921         case STATE_ACK_SENT:
1922                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1923                 break;
1924         case STATE_OPENED:
1925                 (cp->tld)(sp);
1926                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1927                 break;
1928         default:
1929                 printf(SPP_FMT "%s illegal down in state %s\n",
1930                        SPP_ARGS(ifp), cp->name,
1931                        sppp_state_name(sp->state[cp->protoidx]));
1932         }
1933 }
1934
1935
1936 static void
1937 sppp_open_event(const struct cp *cp, struct sppp *sp)
1938 {
1939         STDDCL;
1940
1941         if (debug)
1942                 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1943                     SPP_ARGS(ifp), cp->name,
1944                     sppp_state_name(sp->state[cp->protoidx]));
1945
1946         switch (sp->state[cp->protoidx]) {
1947         case STATE_INITIAL:
1948                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1949                 (cp->tls)(sp);
1950                 break;
1951         case STATE_STARTING:
1952                 break;
1953         case STATE_CLOSED:
1954                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1955                 (cp->scr)(sp);
1956                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1957                 break;
1958         case STATE_STOPPED:
1959                 /*
1960                  * Try escaping stopped state.  This seems to bite
1961                  * people occasionally, in particular for IPCP,
1962                  * presumably following previous IPCP negotiation
1963                  * aborts.  Somehow, we must have missed a Down event
1964                  * which would have caused a transition into starting
1965                  * state, so as a bandaid we force the Down event now.
1966                  * This effectively implements (something like the)
1967                  * `restart' option mentioned in the state transition
1968                  * table of RFC 1661.
1969                  */
1970                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1971                 (cp->tls)(sp);
1972                 break;
1973         case STATE_STOPPING:
1974         case STATE_REQ_SENT:
1975         case STATE_ACK_RCVD:
1976         case STATE_ACK_SENT:
1977         case STATE_OPENED:
1978                 break;
1979         case STATE_CLOSING:
1980                 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1981                 break;
1982         }
1983 }
1984
1985
1986 static void
1987 sppp_close_event(const struct cp *cp, struct sppp *sp)
1988 {
1989         STDDCL;
1990
1991         if (debug)
1992                 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
1993                     SPP_ARGS(ifp), cp->name,
1994                     sppp_state_name(sp->state[cp->protoidx]));
1995
1996         switch (sp->state[cp->protoidx]) {
1997         case STATE_INITIAL:
1998         case STATE_CLOSED:
1999         case STATE_CLOSING:
2000                 break;
2001         case STATE_STARTING:
2002                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
2003                 (cp->tlf)(sp);
2004                 break;
2005         case STATE_STOPPED:
2006                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2007                 break;
2008         case STATE_STOPPING:
2009                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2010                 break;
2011         case STATE_OPENED:
2012                 (cp->tld)(sp);
2013                 /* FALLTHROUGH */
2014         case STATE_REQ_SENT:
2015         case STATE_ACK_RCVD:
2016         case STATE_ACK_SENT:
2017                 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
2018                 sppp_cp_send(sp, cp->proto, TERM_REQ,
2019                              ++sp->pp_seq[cp->protoidx], 0, 0);
2020                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2021                 break;
2022         }
2023 }
2024
2025 static void
2026 sppp_to_event(const struct cp *cp, struct sppp *sp)
2027 {
2028         STDDCL;
2029
2030         SPPP_LOCK(sp);
2031         if (debug)
2032                 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
2033                     SPP_ARGS(ifp), cp->name,
2034                     sppp_state_name(sp->state[cp->protoidx]),
2035                     sp->rst_counter[cp->protoidx]);
2036
2037         if (--sp->rst_counter[cp->protoidx] < 0)
2038                 /* TO- event */
2039                 switch (sp->state[cp->protoidx]) {
2040                 case STATE_CLOSING:
2041                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
2042                         (cp->tlf)(sp);
2043                         break;
2044                 case STATE_STOPPING:
2045                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2046                         (cp->tlf)(sp);
2047                         break;
2048                 case STATE_REQ_SENT:
2049                 case STATE_ACK_RCVD:
2050                 case STATE_ACK_SENT:
2051                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2052                         (cp->tlf)(sp);
2053                         break;
2054                 }
2055         else
2056                 /* TO+ event */
2057                 switch (sp->state[cp->protoidx]) {
2058                 case STATE_CLOSING:
2059                 case STATE_STOPPING:
2060                         sppp_cp_send(sp, cp->proto, TERM_REQ,
2061                                      ++sp->pp_seq[cp->protoidx], 0, 0);
2062                         callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2063                                       cp->TO, (void *)sp);
2064                         break;
2065                 case STATE_REQ_SENT:
2066                 case STATE_ACK_RCVD:
2067                         (cp->scr)(sp);
2068                         /* sppp_cp_change_state() will restart the timer */
2069                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
2070                         break;
2071                 case STATE_ACK_SENT:
2072                         (cp->scr)(sp);
2073                         callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2074                                       cp->TO, (void *)sp);
2075                         break;
2076                 }
2077
2078         SPPP_UNLOCK(sp);
2079 }
2080
2081 /*
2082  * Change the state of a control protocol in the state automaton.
2083  * Takes care of starting/stopping the restart timer.
2084  */
2085 static void
2086 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
2087 {
2088         sp->state[cp->protoidx] = newstate;
2089
2090         callout_stop (&sp->ch[cp->protoidx]);
2091
2092         switch (newstate) {
2093         case STATE_INITIAL:
2094         case STATE_STARTING:
2095         case STATE_CLOSED:
2096         case STATE_STOPPED:
2097         case STATE_OPENED:
2098                 break;
2099         case STATE_CLOSING:
2100         case STATE_STOPPING:
2101         case STATE_REQ_SENT:
2102         case STATE_ACK_RCVD:
2103         case STATE_ACK_SENT:
2104                 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2105                               cp->TO, (void *)sp);
2106                 break;
2107         }
2108 }
2109
2110 /*
2111  *--------------------------------------------------------------------------*
2112  *                                                                          *
2113  *                         The LCP implementation.                          *
2114  *                                                                          *
2115  *--------------------------------------------------------------------------*
2116  */
2117 static void
2118 sppp_pp_up(struct sppp *sp)
2119 {
2120         SPPP_LOCK(sp);
2121         lcp.Up(sp);
2122         SPPP_UNLOCK(sp);
2123 }
2124
2125 static void
2126 sppp_pp_down(struct sppp *sp)
2127 {
2128         SPPP_LOCK(sp);
2129         lcp.Down(sp);
2130         SPPP_UNLOCK(sp);
2131 }
2132
2133 static void
2134 sppp_lcp_init(struct sppp *sp)
2135 {
2136         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2137         sp->lcp.magic = 0;
2138         sp->state[IDX_LCP] = STATE_INITIAL;
2139         sp->fail_counter[IDX_LCP] = 0;
2140         sp->pp_seq[IDX_LCP] = 0;
2141         sp->pp_rseq[IDX_LCP] = 0;
2142         sp->lcp.protos = 0;
2143         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2144
2145         /* Note that these values are  relevant for all control protocols */
2146         sp->lcp.timeout = 3 * hz;
2147         sp->lcp.max_terminate = 2;
2148         sp->lcp.max_configure = 10;
2149         sp->lcp.max_failure = 10;
2150         callout_init(&sp->ch[IDX_LCP], 1);
2151 }
2152
2153 static void
2154 sppp_lcp_up(struct sppp *sp)
2155 {
2156         STDDCL;
2157
2158         sp->pp_alivecnt = 0;
2159         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2160         sp->lcp.magic = 0;
2161         sp->lcp.protos = 0;
2162         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2163         /*
2164          * If we are authenticator, negotiate LCP_AUTH
2165          */
2166         if (sp->hisauth.proto != 0)
2167                 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2168         else
2169                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2170         sp->pp_flags &= ~PP_NEEDAUTH;
2171         /*
2172          * If this interface is passive or dial-on-demand, and we are
2173          * still in Initial state, it means we've got an incoming
2174          * call.  Activate the interface.
2175          */
2176         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2177                 if (debug)
2178                         log(LOG_DEBUG,
2179                             SPP_FMT "Up event", SPP_ARGS(ifp));
2180                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
2181                 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2182                         if (debug)
2183                                 log(-1, "(incoming call)\n");
2184                         sp->pp_flags |= PP_CALLIN;
2185                         lcp.Open(sp);
2186                 } else if (debug)
2187                         log(-1, "\n");
2188         } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2189                    (sp->state[IDX_LCP] == STATE_INITIAL)) {
2190                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
2191                 lcp.Open(sp);
2192         }
2193
2194         sppp_up_event(&lcp, sp);
2195 }
2196
2197 static void
2198 sppp_lcp_down(struct sppp *sp)
2199 {
2200         STDDCL;
2201
2202         sppp_down_event(&lcp, sp);
2203
2204         /*
2205          * If this is neither a dial-on-demand nor a passive
2206          * interface, simulate an ``ifconfig down'' action, so the
2207          * administrator can force a redial by another ``ifconfig
2208          * up''.  XXX For leased line operation, should we immediately
2209          * try to reopen the connection here?
2210          */
2211         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2212                 log(LOG_INFO,
2213                     SPP_FMT "Down event, taking interface down.\n",
2214                     SPP_ARGS(ifp));
2215                 if_down(ifp);
2216         } else {
2217                 if (debug)
2218                         log(LOG_DEBUG,
2219                             SPP_FMT "Down event (carrier loss)\n",
2220                             SPP_ARGS(ifp));
2221                 sp->pp_flags &= ~PP_CALLIN;
2222                 if (sp->state[IDX_LCP] != STATE_INITIAL)
2223                         lcp.Close(sp);
2224                 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
2225         }
2226 }
2227
2228 static void
2229 sppp_lcp_open(struct sppp *sp)
2230 {
2231         sppp_open_event(&lcp, sp);
2232 }
2233
2234 static void
2235 sppp_lcp_close(struct sppp *sp)
2236 {
2237         sppp_close_event(&lcp, sp);
2238 }
2239
2240 static void
2241 sppp_lcp_TO(void *cookie)
2242 {
2243         sppp_to_event(&lcp, (struct sppp *)cookie);
2244 }
2245
2246 /*
2247  * Analyze a configure request.  Return true if it was agreeable, and
2248  * caused action sca, false if it has been rejected or nak'ed, and
2249  * caused action scn.  (The return value is used to make the state
2250  * transition decision in the state automaton.)
2251  */
2252 static int
2253 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2254 {
2255         STDDCL;
2256         u_char *buf, *r, *p;
2257         int origlen, rlen;
2258         u_long nmagic;
2259         u_short authproto;
2260
2261         len -= 4;
2262         origlen = len;
2263         buf = r = malloc (len, M_TEMP, M_NOWAIT);
2264         if (! buf)
2265                 return (0);
2266
2267         if (debug)
2268                 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
2269                     SPP_ARGS(ifp));
2270
2271         /* pass 1: check for things that need to be rejected */
2272         p = (void*) (h+1);
2273         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2274             len-=p[1], p+=p[1]) {
2275                 if (debug)
2276                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2277                 switch (*p) {
2278                 case LCP_OPT_MAGIC:
2279                         /* Magic number. */
2280                         if (len >= 6 && p[1] == 6)
2281                                 continue;
2282                         if (debug)
2283                                 log(-1, "[invalid] ");
2284                         break;
2285                 case LCP_OPT_ASYNC_MAP:
2286                         /* Async control character map. */
2287                         if (len >= 6 && p[1] == 6)
2288                                 continue;
2289                         if (debug)
2290                                 log(-1, "[invalid] ");
2291                         break;
2292                 case LCP_OPT_MRU:
2293                         /* Maximum receive unit. */
2294                         if (len >= 4 && p[1] == 4)
2295                                 continue;
2296                         if (debug)
2297                                 log(-1, "[invalid] ");
2298                         break;
2299                 case LCP_OPT_AUTH_PROTO:
2300                         if (len < 4) {
2301                                 if (debug)
2302                                         log(-1, "[invalid] ");
2303                                 break;
2304                         }
2305                         authproto = (p[2] << 8) + p[3];
2306                         if (authproto == PPP_CHAP && p[1] != 5) {
2307                                 if (debug)
2308                                         log(-1, "[invalid chap len] ");
2309                                 break;
2310                         }
2311                         if (sp->myauth.proto == 0) {
2312                                 /* we are not configured to do auth */
2313                                 if (debug)
2314                                         log(-1, "[not configured] ");
2315                                 break;
2316                         }
2317                         /*
2318                          * Remote want us to authenticate, remember this,
2319                          * so we stay in PHASE_AUTHENTICATE after LCP got
2320                          * up.
2321                          */
2322                         sp->pp_flags |= PP_NEEDAUTH;
2323                         continue;
2324                 default:
2325                         /* Others not supported. */
2326                         if (debug)
2327                                 log(-1, "[rej] ");
2328                         break;
2329                 }
2330                 /* Add the option to rejected list. */
2331                 bcopy (p, r, p[1]);
2332                 r += p[1];
2333                 rlen += p[1];
2334         }
2335         if (rlen) {
2336                 if (debug)
2337                         log(-1, " send conf-rej\n");
2338                 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2339                 return 0;
2340         } else if (debug)
2341                 log(-1, "\n");
2342
2343         /*
2344          * pass 2: check for option values that are unacceptable and
2345          * thus require to be nak'ed.
2346          */
2347         if (debug)
2348                 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2349                     SPP_ARGS(ifp));
2350
2351         p = (void*) (h+1);
2352         len = origlen;
2353         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2354             len-=p[1], p+=p[1]) {
2355                 if (debug)
2356                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2357                 switch (*p) {
2358                 case LCP_OPT_MAGIC:
2359                         /* Magic number -- extract. */
2360                         nmagic = (u_long)p[2] << 24 |
2361                                 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2362                         if (nmagic != sp->lcp.magic) {
2363                                 sp->pp_loopcnt = 0;
2364                                 if (debug)
2365                                         log(-1, "0x%lx ", nmagic);
2366                                 continue;
2367                         }
2368                         if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
2369                                 log(-1, "[glitch] ");
2370                         ++sp->pp_loopcnt;
2371                         /*
2372                          * We negate our magic here, and NAK it.  If
2373                          * we see it later in an NAK packet, we
2374                          * suggest a new one.
2375                          */
2376                         nmagic = ~sp->lcp.magic;
2377                         /* Gonna NAK it. */
2378                         p[2] = nmagic >> 24;
2379                         p[3] = nmagic >> 16;
2380                         p[4] = nmagic >> 8;
2381                         p[5] = nmagic;
2382                         break;
2383
2384                 case LCP_OPT_ASYNC_MAP:
2385                         /*
2386                          * Async control character map -- just ignore it.
2387                          *
2388                          * Quote from RFC 1662, chapter 6:
2389                          * To enable this functionality, synchronous PPP
2390                          * implementations MUST always respond to the
2391                          * Async-Control-Character-Map Configuration
2392                          * Option with the LCP Configure-Ack.  However,
2393                          * acceptance of the Configuration Option does
2394                          * not imply that the synchronous implementation
2395                          * will do any ACCM mapping.  Instead, all such
2396                          * octet mapping will be performed by the
2397                          * asynchronous-to-synchronous converter.
2398                          */
2399                         continue;
2400
2401                 case LCP_OPT_MRU:
2402                         /*
2403                          * Maximum receive unit.  Always agreeable,
2404                          * but ignored by now.
2405                          */
2406                         sp->lcp.their_mru = p[2] * 256 + p[3];
2407                         if (debug)
2408                                 log(-1, "%lu ", sp->lcp.their_mru);
2409                         continue;
2410
2411                 case LCP_OPT_AUTH_PROTO:
2412                         authproto = (p[2] << 8) + p[3];
2413                         if (sp->myauth.proto != authproto) {
2414                                 /* not agreed, nak */
2415                                 if (debug)
2416                                         log(-1, "[mine %s != his %s] ",
2417                                                sppp_proto_name(sp->hisauth.proto),
2418                                                sppp_proto_name(authproto));
2419                                 p[2] = sp->myauth.proto >> 8;
2420                                 p[3] = sp->myauth.proto;
2421                                 break;
2422                         }
2423                         if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2424                                 if (debug)
2425                                         log(-1, "[chap not MD5] ");
2426                                 p[4] = CHAP_MD5;
2427                                 break;
2428                         }
2429                         continue;
2430                 }
2431                 /* Add the option to nak'ed list. */
2432                 bcopy (p, r, p[1]);
2433                 r += p[1];
2434                 rlen += p[1];
2435         }
2436         if (rlen) {
2437                 /*
2438                  * Local and remote magics equal -- loopback?
2439                  */
2440                 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2441                         if (sp->pp_loopcnt == MAXALIVECNT*5)
2442                                 printf (SPP_FMT "loopback\n",
2443                                         SPP_ARGS(ifp));
2444                         if (ifp->if_flags & IFF_UP) {
2445                                 if_down(ifp);
2446                                 sppp_qflush(&sp->pp_cpq);
2447                                 /* XXX ? */
2448                                 lcp.Down(sp);
2449                                 lcp.Up(sp);
2450                         }
2451                 } else if (!sp->pp_loopcnt &&
2452                            ++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2453                         if (debug)
2454                                 log(-1, " max_failure (%d) exceeded, "
2455                                        "send conf-rej\n",
2456                                        sp->lcp.max_failure);
2457                         sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2458                 } else {
2459                         if (debug)
2460                                 log(-1, " send conf-nak\n");
2461                         sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2462                 }
2463         } else {
2464                 if (debug)
2465                         log(-1, " send conf-ack\n");
2466                 sp->fail_counter[IDX_LCP] = 0;
2467                 sp->pp_loopcnt = 0;
2468                 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2469                               h->ident, origlen, h+1);
2470         }
2471
2472         free (buf, M_TEMP);
2473         return (rlen == 0);
2474 }
2475
2476 /*
2477  * Analyze the LCP Configure-Reject option list, and adjust our
2478  * negotiation.
2479  */
2480 static void
2481 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2482 {
2483         STDDCL;
2484         u_char *buf, *p;
2485
2486         len -= 4;
2487         buf = malloc (len, M_TEMP, M_NOWAIT);
2488         if (!buf)
2489                 return;
2490
2491         if (debug)
2492                 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2493                     SPP_ARGS(ifp));
2494
2495         p = (void*) (h+1);
2496         for (; len >= 2 && p[1] >= 2 && len >= p[1];
2497             len -= p[1], p += p[1]) {
2498                 if (debug)
2499                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2500                 switch (*p) {
2501                 case LCP_OPT_MAGIC:
2502                         /* Magic number -- can't use it, use 0 */
2503                         sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2504                         sp->lcp.magic = 0;
2505                         break;
2506                 case LCP_OPT_MRU:
2507                         /*
2508                          * Should not be rejected anyway, since we only
2509                          * negotiate a MRU if explicitly requested by
2510                          * peer.
2511                          */
2512                         sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2513                         break;
2514                 case LCP_OPT_AUTH_PROTO:
2515                         /*
2516                          * Peer doesn't want to authenticate himself,
2517                          * deny unless this is a dialout call, and
2518                          * AUTHFLAG_NOCALLOUT is set.
2519                          */
2520                         if ((sp->pp_flags & PP_CALLIN) == 0 &&
2521                             (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2522                                 if (debug)
2523                                         log(-1, "[don't insist on auth "
2524                                                "for callout]");
2525                                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2526                                 break;
2527                         }
2528                         if (debug)
2529                                 log(-1, "[access denied]\n");
2530                         lcp.Close(sp);
2531                         break;
2532                 }
2533         }
2534         if (debug)
2535                 log(-1, "\n");
2536         free (buf, M_TEMP);
2537         return;
2538 }
2539
2540 /*
2541  * Analyze the LCP Configure-NAK option list, and adjust our
2542  * negotiation.
2543  */
2544 static void
2545 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2546 {
2547         STDDCL;
2548         u_char *buf, *p;
2549         u_long magic;
2550
2551         len -= 4;
2552         buf = malloc (len, M_TEMP, M_NOWAIT);
2553         if (!buf)
2554                 return;
2555
2556         if (debug)
2557                 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2558                     SPP_ARGS(ifp));
2559
2560         p = (void*) (h+1);
2561         for (; len >= 2 && p[1] >= 2 && len >= p[1];
2562             len -= p[1], p += p[1]) {
2563                 if (debug)
2564                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2565                 switch (*p) {
2566                 case LCP_OPT_MAGIC:
2567                         /* Magic number -- renegotiate */
2568                         if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2569                             len >= 6 && p[1] == 6) {
2570                                 magic = (u_long)p[2] << 24 |
2571                                         (u_long)p[3] << 16 | p[4] << 8 | p[5];
2572                                 /*
2573                                  * If the remote magic is our negated one,
2574                                  * this looks like a loopback problem.
2575                                  * Suggest a new magic to make sure.
2576                                  */
2577                                 if (magic == ~sp->lcp.magic) {
2578                                         if (debug)
2579                                                 log(-1, "magic glitch ");
2580                                         sp->lcp.magic = random();
2581                                 } else {
2582                                         sp->lcp.magic = magic;
2583                                         if (debug)
2584                                                 log(-1, "%lu ", magic);
2585                                 }
2586                         }
2587                         break;
2588                 case LCP_OPT_MRU:
2589                         /*
2590                          * Peer wants to advise us to negotiate an MRU.
2591                          * Agree on it if it's reasonable, or use
2592                          * default otherwise.
2593                          */
2594                         if (len >= 4 && p[1] == 4) {
2595                                 u_int mru = p[2] * 256 + p[3];
2596                                 if (debug)
2597                                         log(-1, "%d ", mru);
2598                                 if (mru < PP_MTU || mru > PP_MAX_MRU)
2599                                         mru = PP_MTU;
2600                                 sp->lcp.mru = mru;
2601                                 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2602                         }
2603                         break;
2604                 case LCP_OPT_AUTH_PROTO:
2605                         /*
2606                          * Peer doesn't like our authentication method,
2607                          * deny.
2608                          */
2609                         if (debug)
2610                                 log(-1, "[access denied]\n");
2611                         lcp.Close(sp);
2612                         break;
2613                 }
2614         }
2615         if (debug)
2616                 log(-1, "\n");
2617         free (buf, M_TEMP);
2618         return;
2619 }
2620
2621 static void
2622 sppp_lcp_tlu(struct sppp *sp)
2623 {
2624         STDDCL;
2625         int i;
2626         u_long mask;
2627
2628         /* XXX ? */
2629         if (! (ifp->if_flags & IFF_UP) &&
2630             (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
2631                 /* Coming out of loopback mode. */
2632                 if_up(ifp);
2633                 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
2634         }
2635
2636         for (i = 0; i < IDX_COUNT; i++)
2637                 if ((cps[i])->flags & CP_QUAL)
2638                         (cps[i])->Open(sp);
2639
2640         if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2641             (sp->pp_flags & PP_NEEDAUTH) != 0)
2642                 sp->pp_phase = PHASE_AUTHENTICATE;
2643         else
2644                 sp->pp_phase = PHASE_NETWORK;
2645
2646         if (debug)
2647                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2648                     sppp_phase_name(sp->pp_phase));
2649
2650         /*
2651          * Open all authentication protocols.  This is even required
2652          * if we already proceeded to network phase, since it might be
2653          * that remote wants us to authenticate, so we might have to
2654          * send a PAP request.  Undesired authentication protocols
2655          * don't do anything when they get an Open event.
2656          */
2657         for (i = 0; i < IDX_COUNT; i++)
2658                 if ((cps[i])->flags & CP_AUTH)
2659                         (cps[i])->Open(sp);
2660
2661         if (sp->pp_phase == PHASE_NETWORK) {
2662                 /* Notify all NCPs. */
2663                 for (i = 0; i < IDX_COUNT; i++)
2664                         if (((cps[i])->flags & CP_NCP) &&
2665                             /*
2666                              * XXX
2667                              * Hack to administratively disable IPv6 if
2668                              * not desired.  Perhaps we should have another
2669                              * flag for this, but right now, we can make
2670                              * all struct cp's read/only.
2671                              */
2672                             (cps[i] != &ipv6cp ||
2673                              (sp->confflags & CONF_ENABLE_IPV6)))
2674                                 (cps[i])->Open(sp);
2675         }
2676
2677         /* Send Up events to all started protos. */
2678         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2679                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2680                         (cps[i])->Up(sp);
2681
2682         /* notify low-level driver of state change */
2683         if (sp->pp_chg)
2684                 sp->pp_chg(sp, (int)sp->pp_phase);
2685
2686         if (sp->pp_phase == PHASE_NETWORK)
2687                 /* if no NCP is starting, close down */
2688                 sppp_lcp_check_and_close(sp);
2689 }
2690
2691 static void
2692 sppp_lcp_tld(struct sppp *sp)
2693 {
2694         STDDCL;
2695         int i;
2696         u_long mask;
2697
2698         sp->pp_phase = PHASE_TERMINATE;
2699
2700         if (debug)
2701                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2702                     sppp_phase_name(sp->pp_phase));
2703
2704         /*
2705          * Take upper layers down.  We send the Down event first and
2706          * the Close second to prevent the upper layers from sending
2707          * ``a flurry of terminate-request packets'', as the RFC
2708          * describes it.
2709          */
2710         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2711                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2712                         (cps[i])->Down(sp);
2713                         (cps[i])->Close(sp);
2714                 }
2715 }
2716
2717 static void
2718 sppp_lcp_tls(struct sppp *sp)
2719 {
2720         STDDCL;
2721
2722         sp->pp_phase = PHASE_ESTABLISH;
2723
2724         if (debug)
2725                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2726                     sppp_phase_name(sp->pp_phase));
2727
2728         /* Notify lower layer if desired. */
2729         if (sp->pp_tls)
2730                 (sp->pp_tls)(sp);
2731         else
2732                 (sp->pp_up)(sp);
2733 }
2734
2735 static void
2736 sppp_lcp_tlf(struct sppp *sp)
2737 {
2738         STDDCL;
2739
2740         sp->pp_phase = PHASE_DEAD;
2741         if (debug)
2742                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2743                     sppp_phase_name(sp->pp_phase));
2744
2745         /* Notify lower layer if desired. */
2746         if (sp->pp_tlf)
2747                 (sp->pp_tlf)(sp);
2748         else
2749                 (sp->pp_down)(sp);
2750 }
2751
2752 static void
2753 sppp_lcp_scr(struct sppp *sp)
2754 {
2755         char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2756         int i = 0;
2757         u_short authproto;
2758
2759         if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2760                 if (! sp->lcp.magic)
2761                         sp->lcp.magic = random();
2762                 opt[i++] = LCP_OPT_MAGIC;
2763                 opt[i++] = 6;
2764                 opt[i++] = sp->lcp.magic >> 24;
2765                 opt[i++] = sp->lcp.magic >> 16;
2766                 opt[i++] = sp->lcp.magic >> 8;
2767                 opt[i++] = sp->lcp.magic;
2768         }
2769
2770         if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2771                 opt[i++] = LCP_OPT_MRU;
2772                 opt[i++] = 4;
2773                 opt[i++] = sp->lcp.mru >> 8;
2774                 opt[i++] = sp->lcp.mru;
2775         }
2776
2777         if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2778                 authproto = sp->hisauth.proto;
2779                 opt[i++] = LCP_OPT_AUTH_PROTO;
2780                 opt[i++] = authproto == PPP_CHAP? 5: 4;
2781                 opt[i++] = authproto >> 8;
2782                 opt[i++] = authproto;
2783                 if (authproto == PPP_CHAP)
2784                         opt[i++] = CHAP_MD5;
2785         }
2786
2787         sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2788         sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2789 }
2790
2791 /*
2792  * Check the open NCPs, return true if at least one NCP is open.
2793  */
2794 static int
2795 sppp_ncp_check(struct sppp *sp)
2796 {
2797         int i, mask;
2798
2799         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2800                 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2801                         return 1;
2802         return 0;
2803 }
2804
2805 /*
2806  * Re-check the open NCPs and see if we should terminate the link.
2807  * Called by the NCPs during their tlf action handling.
2808  */
2809 static void
2810 sppp_lcp_check_and_close(struct sppp *sp)
2811 {
2812
2813         if (sp->pp_phase < PHASE_NETWORK)
2814                 /* don't bother, we are already going down */
2815                 return;
2816
2817         if (sppp_ncp_check(sp))
2818                 return;
2819
2820         lcp.Close(sp);
2821 }
2822
2823 /*
2824  *--------------------------------------------------------------------------*
2825  *                                                                          *
2826  *                        The IPCP implementation.                          *
2827  *                                                                          *
2828  *--------------------------------------------------------------------------*
2829  */
2830
2831 #ifdef INET
2832 static void
2833 sppp_ipcp_init(struct sppp *sp)
2834 {
2835         sp->ipcp.opts = 0;
2836         sp->ipcp.flags = 0;
2837         sp->state[IDX_IPCP] = STATE_INITIAL;
2838         sp->fail_counter[IDX_IPCP] = 0;
2839         sp->pp_seq[IDX_IPCP] = 0;
2840         sp->pp_rseq[IDX_IPCP] = 0;
2841         callout_init(&sp->ch[IDX_IPCP], 1);
2842 }
2843
2844 static void
2845 sppp_ipcp_up(struct sppp *sp)
2846 {
2847         sppp_up_event(&ipcp, sp);
2848 }
2849
2850 static void
2851 sppp_ipcp_down(struct sppp *sp)
2852 {
2853         sppp_down_event(&ipcp, sp);
2854 }
2855
2856 static void
2857 sppp_ipcp_open(struct sppp *sp)
2858 {
2859         STDDCL;
2860         u_long myaddr, hisaddr;
2861
2862         sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
2863                             IPCP_MYADDR_DYN | IPCP_VJ);
2864         sp->ipcp.opts = 0;
2865
2866         sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2867         /*
2868          * If we don't have his address, this probably means our
2869          * interface doesn't want to talk IP at all.  (This could
2870          * be the case if somebody wants to speak only IPX, for
2871          * example.)  Don't open IPCP in this case.
2872          */
2873         if (hisaddr == 0L) {
2874                 /* XXX this message should go away */
2875                 if (debug)
2876                         log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2877                             SPP_ARGS(ifp));
2878                 return;
2879         }
2880         if (myaddr == 0L) {
2881                 /*
2882                  * I don't have an assigned address, so i need to
2883                  * negotiate my address.
2884                  */
2885                 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2886                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2887         } else
2888                 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2889         if (sp->confflags & CONF_ENABLE_VJ) {
2890                 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
2891                 sp->ipcp.max_state = MAX_STATES - 1;
2892                 sp->ipcp.compress_cid = 1;
2893         }
2894         sppp_open_event(&ipcp, sp);
2895 }
2896
2897 static void
2898 sppp_ipcp_close(struct sppp *sp)
2899 {
2900         sppp_close_event(&ipcp, sp);
2901         if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2902                 /*
2903                  * My address was dynamic, clear it again.
2904                  */
2905                 sppp_set_ip_addr(sp, 0L);
2906 }
2907
2908 static void
2909 sppp_ipcp_TO(void *cookie)
2910 {
2911         sppp_to_event(&ipcp, (struct sppp *)cookie);
2912 }
2913
2914 /*
2915  * Analyze a configure request.  Return true if it was agreeable, and
2916  * caused action sca, false if it has been rejected or nak'ed, and
2917  * caused action scn.  (The return value is used to make the state
2918  * transition decision in the state automaton.)
2919  */
2920 static int
2921 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2922 {
2923         u_char *buf, *r, *p;
2924         struct ifnet *ifp = SP2IFP(sp);
2925         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2926         u_long hisaddr, desiredaddr;
2927         int gotmyaddr = 0;
2928         int desiredcomp;
2929
2930         len -= 4;
2931         origlen = len;
2932         /*
2933          * Make sure to allocate a buf that can at least hold a
2934          * conf-nak with an `address' option.  We might need it below.
2935          */
2936         buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
2937         if (! buf)
2938                 return (0);
2939
2940         /* pass 1: see if we can recognize them */
2941         if (debug)
2942                 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2943                     SPP_ARGS(ifp));
2944         p = (void*) (h+1);
2945         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2946             len-=p[1], p+=p[1]) {
2947                 if (debug)
2948                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
2949                 switch (*p) {
2950                 case IPCP_OPT_COMPRESSION:
2951                         if (!(sp->confflags & CONF_ENABLE_VJ)) {
2952                                 /* VJ compression administratively disabled */
2953                                 if (debug)
2954                                         log(-1, "[locally disabled] ");
2955                                 break;
2956                         }
2957                         /*
2958                          * In theory, we should only conf-rej an
2959                          * option that is shorter than RFC 1618
2960                          * requires (i.e. < 4), and should conf-nak
2961                          * anything else that is not VJ.  However,
2962                          * since our algorithm always uses the
2963                          * original option to NAK it with new values,
2964                          * things would become more complicated.  In
2965                          * practice, the only commonly implemented IP
2966                          * compression option is VJ anyway, so the
2967                          * difference is negligible.
2968                          */
2969                         if (len >= 6 && p[1] == 6) {
2970                                 /*
2971                                  * correctly formed compression option
2972                                  * that could be VJ compression
2973                                  */
2974                                 continue;
2975                         }
2976                         if (debug)
2977                                 log(-1,
2978                                     "optlen %d [invalid/unsupported] ",
2979                                     p[1]);
2980                         break;
2981                 case IPCP_OPT_ADDRESS:
2982                         if (len >= 6 && p[1] == 6) {
2983                                 /* correctly formed address option */
2984                                 continue;
2985                         }
2986                         if (debug)
2987                                 log(-1, "[invalid] ");
2988                         break;
2989                 default:
2990                         /* Others not supported. */
2991                         if (debug)
2992                                 log(-1, "[rej] ");
2993                         break;
2994                 }
2995                 /* Add the option to rejected list. */
2996                 bcopy (p, r, p[1]);
2997                 r += p[1];
2998                 rlen += p[1];
2999         }
3000         if (rlen) {
3001                 if (debug)
3002                         log(-1, " send conf-rej\n");
3003                 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
3004                 return 0;
3005         } else if (debug)
3006                 log(-1, "\n");
3007
3008         /* pass 2: parse option values */
3009         sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
3010         if (debug)
3011                 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
3012                        SPP_ARGS(ifp));
3013         p = (void*) (h+1);
3014         len = origlen;
3015         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3016             len-=p[1], p+=p[1]) {
3017                 if (debug)
3018                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3019                 switch (*p) {
3020                 case IPCP_OPT_COMPRESSION:
3021                         desiredcomp = p[2] << 8 | p[3];
3022                         /* We only support VJ */
3023                         if (desiredcomp == IPCP_COMP_VJ) {
3024                                 if (debug)
3025                                         log(-1, "VJ [ack] ");
3026                                 sp->ipcp.flags |= IPCP_VJ;
3027                                 sl_compress_init(sp->pp_comp, p[4]);
3028                                 sp->ipcp.max_state = p[4];
3029                                 sp->ipcp.compress_cid = p[5];
3030                                 continue;
3031                         }
3032                         if (debug)
3033                                 log(-1,
3034                                     "compproto %#04x [not supported] ",
3035                                     desiredcomp);
3036                         p[2] = IPCP_COMP_VJ >> 8;
3037                         p[3] = IPCP_COMP_VJ;
3038                         p[4] = sp->ipcp.max_state;
3039                         p[5] = sp->ipcp.compress_cid;
3040                         break;
3041                 case IPCP_OPT_ADDRESS:
3042                         /* This is the address he wants in his end */
3043                         desiredaddr = p[2] << 24 | p[3] << 16 |
3044                                 p[4] << 8 | p[5];
3045                         if (desiredaddr == hisaddr ||
3046                             (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
3047                                 /*
3048                                  * Peer's address is same as our value,
3049                                  * or we have set it to 0.0.0.* to
3050                                  * indicate that we do not really care,
3051                                  * this is agreeable.  Gonna conf-ack
3052                                  * it.
3053                                  */
3054                                 if (debug)
3055                                         log(-1, "%s [ack] ",
3056                                                 sppp_dotted_quad(hisaddr));
3057                                 /* record that we've seen it already */
3058                                 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
3059                                 continue;
3060                         }
3061                         /*
3062                          * The address wasn't agreeable.  This is either
3063                          * he sent us 0.0.0.0, asking to assign him an
3064                          * address, or he send us another address not
3065                          * matching our value.  Either case, we gonna
3066                          * conf-nak it with our value.
3067                          * XXX: we should "rej" if hisaddr == 0
3068                          */
3069                         if (debug) {
3070                                 if (desiredaddr == 0)
3071                                         log(-1, "[addr requested] ");
3072                                 else
3073                                         log(-1, "%s [not agreed] ",
3074                                                 sppp_dotted_quad(desiredaddr));
3075
3076                         }
3077                         p[2] = hisaddr >> 24;
3078                         p[3] = hisaddr >> 16;
3079                         p[4] = hisaddr >> 8;
3080                         p[5] = hisaddr;
3081                         break;
3082                 }
3083                 /* Add the option to nak'ed list. */
3084                 bcopy (p, r, p[1]);
3085                 r += p[1];
3086                 rlen += p[1];
3087         }
3088
3089         /*
3090          * If we are about to conf-ack the request, but haven't seen
3091          * his address so far, gonna conf-nak it instead, with the
3092          * `address' option present and our idea of his address being
3093          * filled in there, to request negotiation of both addresses.
3094          *
3095          * XXX This can result in an endless req - nak loop if peer
3096          * doesn't want to send us his address.  Q: What should we do
3097          * about it?  XXX  A: implement the max-failure counter.
3098          */
3099         if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
3100                 buf[0] = IPCP_OPT_ADDRESS;
3101                 buf[1] = 6;
3102                 buf[2] = hisaddr >> 24;
3103                 buf[3] = hisaddr >> 16;
3104                 buf[4] = hisaddr >> 8;
3105                 buf[5] = hisaddr;
3106                 rlen = 6;
3107                 if (debug)
3108                         log(-1, "still need hisaddr ");
3109         }
3110
3111         if (rlen) {
3112                 if (debug)
3113                         log(-1, " send conf-nak\n");
3114                 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
3115         } else {
3116                 if (debug)
3117                         log(-1, " send conf-ack\n");
3118                 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
3119                               h->ident, origlen, h+1);
3120         }
3121
3122         free (buf, M_TEMP);
3123         return (rlen == 0);
3124 }
3125
3126 /*
3127  * Analyze the IPCP Configure-Reject option list, and adjust our
3128  * negotiation.
3129  */
3130 static void
3131 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3132 {
3133         u_char *buf, *p;
3134         struct ifnet *ifp = SP2IFP(sp);
3135         int debug = ifp->if_flags & IFF_DEBUG;
3136
3137         len -= 4;
3138         buf = malloc (len, M_TEMP, M_NOWAIT);
3139         if (!buf)
3140                 return;
3141
3142         if (debug)
3143                 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
3144                     SPP_ARGS(ifp));
3145
3146         p = (void*) (h+1);
3147         for (; len >= 2 && p[1] >= 2 && len >= p[1];
3148             len -= p[1], p += p[1]) {
3149                 if (debug)
3150                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3151                 switch (*p) {
3152                 case IPCP_OPT_COMPRESSION:
3153                         sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
3154                         break;
3155                 case IPCP_OPT_ADDRESS:
3156                         /*
3157                          * Peer doesn't grok address option.  This is
3158                          * bad.  XXX  Should we better give up here?
3159                          * XXX We could try old "addresses" option...
3160                          */
3161                         sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3162                         break;
3163                 }
3164         }
3165         if (debug)
3166                 log(-1, "\n");
3167         free (buf, M_TEMP);
3168         return;
3169 }
3170
3171 /*
3172  * Analyze the IPCP Configure-NAK option list, and adjust our
3173  * negotiation.
3174  */
3175 static void
3176 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3177 {
3178         u_char *buf, *p;
3179         struct ifnet *ifp = SP2IFP(sp);
3180         int debug = ifp->if_flags & IFF_DEBUG;
3181         int desiredcomp;
3182         u_long wantaddr;
3183
3184         len -= 4;
3185         buf = malloc (len, M_TEMP, M_NOWAIT);
3186         if (!buf)
3187                 return;
3188
3189         if (debug)
3190                 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
3191                     SPP_ARGS(ifp));
3192
3193         p = (void*) (h+1);
3194         for (; len >= 2 && p[1] >= 2 && len >= p[1];
3195             len -= p[1], p += p[1]) {
3196                 if (debug)
3197                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3198                 switch (*p) {
3199                 case IPCP_OPT_COMPRESSION:
3200                         if (len >= 6 && p[1] == 6) {
3201                                 desiredcomp = p[2] << 8 | p[3];
3202                                 if (debug)
3203                                         log(-1, "[wantcomp %#04x] ",
3204                                                 desiredcomp);
3205                                 if (desiredcomp == IPCP_COMP_VJ) {
3206                                         sl_compress_init(sp->pp_comp, p[4]);
3207                                         sp->ipcp.max_state = p[4];
3208                                         sp->ipcp.compress_cid = p[5];
3209                                         if (debug)
3210                                                 log(-1, "[agree] ");
3211                                 } else
3212                                         sp->ipcp.opts &=
3213                                                 ~(1 << IPCP_OPT_COMPRESSION);
3214                         }
3215                         break;
3216                 case IPCP_OPT_ADDRESS:
3217                         /*
3218                          * Peer doesn't like our local IP address.  See
3219                          * if we can do something for him.  We'll drop
3220                          * him our address then.
3221                          */
3222                         if (len >= 6 && p[1] == 6) {
3223                                 wantaddr = p[2] << 24 | p[3] << 16 |
3224                                         p[4] << 8 | p[5];
3225                                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3226                                 if (debug)
3227                                         log(-1, "[wantaddr %s] ",
3228                                                sppp_dotted_quad(wantaddr));
3229                                 /*
3230                                  * When doing dynamic address assignment,
3231                                  * we accept his offer.  Otherwise, we
3232                                  * ignore it and thus continue to negotiate
3233                                  * our already existing value.
3234                                  * XXX: Bogus, if he said no once, he'll
3235                                  * just say no again, might as well die.
3236                                  */
3237                                 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3238                                         sppp_set_ip_addr(sp, wantaddr);
3239                                         if (debug)
3240                                                 log(-1, "[agree] ");
3241                                         sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3242                                 }
3243                         }
3244                         break;
3245                 }
3246         }
3247         if (debug)
3248                 log(-1, "\n");
3249         free (buf, M_TEMP);
3250         return;
3251 }
3252
3253 static void
3254 sppp_ipcp_tlu(struct sppp *sp)
3255 {
3256         /* we are up - notify isdn daemon */
3257         if (sp->pp_con)
3258                 sp->pp_con(sp);
3259 }
3260
3261 static void
3262 sppp_ipcp_tld(struct sppp *sp)
3263 {
3264 }
3265
3266 static void
3267 sppp_ipcp_tls(struct sppp *sp)
3268 {
3269         /* indicate to LCP that it must stay alive */
3270         sp->lcp.protos |= (1 << IDX_IPCP);
3271 }
3272
3273 static void
3274 sppp_ipcp_tlf(struct sppp *sp)
3275 {
3276         /* we no longer need LCP */
3277         sp->lcp.protos &= ~(1 << IDX_IPCP);
3278         sppp_lcp_check_and_close(sp);
3279 }
3280
3281 static void
3282 sppp_ipcp_scr(struct sppp *sp)
3283 {
3284         char opt[6 /* compression */ + 6 /* address */];
3285         u_long ouraddr;
3286         int i = 0;
3287
3288         if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3289                 opt[i++] = IPCP_OPT_COMPRESSION;
3290                 opt[i++] = 6;
3291                 opt[i++] = IPCP_COMP_VJ >> 8;
3292                 opt[i++] = IPCP_COMP_VJ;
3293                 opt[i++] = sp->ipcp.max_state;
3294                 opt[i++] = sp->ipcp.compress_cid;
3295         }
3296         if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3297                 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3298                 opt[i++] = IPCP_OPT_ADDRESS;
3299                 opt[i++] = 6;
3300                 opt[i++] = ouraddr >> 24;
3301                 opt[i++] = ouraddr >> 16;
3302                 opt[i++] = ouraddr >> 8;
3303                 opt[i++] = ouraddr;
3304         }
3305
3306         sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3307         sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3308 }
3309 #else /* !INET */
3310 static void
3311 sppp_ipcp_init(struct sppp *sp)
3312 {
3313 }
3314
3315 static void
3316 sppp_ipcp_up(struct sppp *sp)
3317 {
3318 }
3319
3320 static void
3321 sppp_ipcp_down(struct sppp *sp)
3322 {
3323 }
3324
3325 static void
3326 sppp_ipcp_open(struct sppp *sp)
3327 {
3328 }
3329
3330 static void
3331 sppp_ipcp_close(struct sppp *sp)
3332 {
3333 }
3334
3335 static void
3336 sppp_ipcp_TO(void *cookie)
3337 {
3338 }
3339
3340 static int
3341 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3342 {
3343         return (0);
3344 }
3345
3346 static void
3347 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3348 {
3349 }
3350
3351 static void
3352 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3353 {
3354 }
3355
3356 static void
3357 sppp_ipcp_tlu(struct sppp *sp)
3358 {
3359 }
3360
3361 static void
3362 sppp_ipcp_tld(struct sppp *sp)
3363 {
3364 }
3365
3366 static void
3367 sppp_ipcp_tls(struct sppp *sp)
3368 {
3369 }
3370
3371 static void
3372 sppp_ipcp_tlf(struct sppp *sp)
3373 {
3374 }
3375
3376 static void
3377 sppp_ipcp_scr(struct sppp *sp)
3378 {
3379 }
3380 #endif
3381
3382 /*
3383  *--------------------------------------------------------------------------*
3384  *                                                                          *
3385  *                      The IPv6CP implementation.                          *
3386  *                                                                          *
3387  *--------------------------------------------------------------------------*
3388  */
3389
3390 #ifdef INET6
3391 static void
3392 sppp_ipv6cp_init(struct sppp *sp)
3393 {
3394         sp->ipv6cp.opts = 0;
3395         sp->ipv6cp.flags = 0;
3396         sp->state[IDX_IPV6CP] = STATE_INITIAL;
3397         sp->fail_counter[IDX_IPV6CP] = 0;
3398         sp->pp_seq[IDX_IPV6CP] = 0;
3399         sp->pp_rseq[IDX_IPV6CP] = 0;
3400         callout_init(&sp->ch[IDX_IPV6CP], 1);
3401 }
3402
3403 static void
3404 sppp_ipv6cp_up(struct sppp *sp)
3405 {
3406         sppp_up_event(&ipv6cp, sp);
3407 }
3408
3409 static void
3410 sppp_ipv6cp_down(struct sppp *sp)
3411 {
3412         sppp_down_event(&ipv6cp, sp);
3413 }
3414
3415 static void
3416 sppp_ipv6cp_open(struct sppp *sp)
3417 {
3418         STDDCL;
3419         struct in6_addr myaddr, hisaddr;
3420
3421 #ifdef IPV6CP_MYIFID_DYN
3422         sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3423 #else
3424         sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3425 #endif
3426
3427         sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3428         /*
3429          * If we don't have our address, this probably means our
3430          * interface doesn't want to talk IPv6 at all.  (This could
3431          * be the case if somebody wants to speak only IPX, for
3432          * example.)  Don't open IPv6CP in this case.
3433          */
3434         if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3435                 /* XXX this message should go away */
3436                 if (debug)
3437                         log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
3438                             SPP_ARGS(ifp));
3439                 return;
3440         }
3441
3442         sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3443         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3444         sppp_open_event(&ipv6cp, sp);
3445 }
3446
3447 static void
3448 sppp_ipv6cp_close(struct sppp *sp)
3449 {
3450         sppp_close_event(&ipv6cp, sp);
3451 }
3452
3453 static void
3454 sppp_ipv6cp_TO(void *cookie)
3455 {
3456         sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3457 }
3458
3459 /*
3460  * Analyze a configure request.  Return true if it was agreeable, and
3461  * caused action sca, false if it has been rejected or nak'ed, and
3462  * caused action scn.  (The return value is used to make the state
3463  * transition decision in the state automaton.)
3464  */
3465 static int
3466 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3467 {
3468         u_char *buf, *r, *p;
3469         struct ifnet *ifp = SP2IFP(sp);
3470         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3471         struct in6_addr myaddr, desiredaddr, suggestaddr;
3472         int ifidcount;
3473         int type;
3474         int collision, nohisaddr;
3475         char ip6buf[INET6_ADDRSTRLEN];
3476
3477         len -= 4;
3478         origlen = len;
3479         /*
3480          * Make sure to allocate a buf that can at least hold a
3481          * conf-nak with an `address' option.  We might need it below.
3482          */
3483         buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
3484         if (! buf)
3485                 return (0);
3486
3487         /* pass 1: see if we can recognize them */
3488         if (debug)
3489                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
3490                     SPP_ARGS(ifp));
3491         p = (void*) (h+1);
3492         ifidcount = 0;
3493         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3494             len-=p[1], p+=p[1]) {
3495                 if (debug)
3496                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3497                 switch (*p) {
3498                 case IPV6CP_OPT_IFID:
3499                         if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3500                                 /* correctly formed address option */
3501                                 ifidcount++;
3502                                 continue;
3503                         }
3504                         if (debug)
3505                                 log(-1, " [invalid]");
3506                         break;
3507 #ifdef notyet
3508                 case IPV6CP_OPT_COMPRESSION:
3509                         if (len >= 4 && p[1] >= 4) {
3510                                 /* correctly formed compress option */
3511                                 continue;
3512                         }
3513                         if (debug)
3514                                 log(-1, " [invalid]");
3515                         break;
3516 #endif
3517                 default:
3518                         /* Others not supported. */
3519                         if (debug)
3520                                 log(-1, " [rej]");
3521                         break;
3522                 }
3523                 /* Add the option to rejected list. */
3524                 bcopy (p, r, p[1]);
3525                 r += p[1];
3526                 rlen += p[1];
3527         }
3528         if (rlen) {
3529                 if (debug)
3530                         log(-1, " send conf-rej\n");
3531                 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3532                 goto end;
3533         } else if (debug)
3534                 log(-1, "\n");
3535
3536         /* pass 2: parse option values */
3537         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3538         if (debug)
3539                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
3540                     SPP_ARGS(ifp));
3541         p = (void*) (h+1);
3542         len = origlen;
3543         type = CONF_ACK;
3544         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3545             len-=p[1], p+=p[1]) {
3546                 if (debug)
3547                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3548                 switch (*p) {
3549 #ifdef notyet
3550                 case IPV6CP_OPT_COMPRESSION:
3551                         continue;
3552 #endif
3553                 case IPV6CP_OPT_IFID:
3554                         bzero(&desiredaddr, sizeof(desiredaddr));
3555                         bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3556                         collision = (bcmp(&desiredaddr.s6_addr[8],
3557                                           &myaddr.s6_addr[8], 8) == 0);
3558                         nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3559
3560                         desiredaddr.s6_addr16[0] = htons(0xfe80);
3561                         (void)in6_setscope(&desiredaddr, SP2IFP(sp), NULL);
3562
3563                         if (!collision && !nohisaddr) {
3564                                 /* no collision, hisaddr known - Conf-Ack */
3565                                 type = CONF_ACK;
3566
3567                                 if (debug) {
3568                                         log(-1, " %s [%s]",
3569                                             ip6_sprintf(ip6buf, &desiredaddr),
3570                                             sppp_cp_type_name(type));
3571                                 }
3572                                 continue;
3573                         }
3574
3575                         bzero(&suggestaddr, sizeof(suggestaddr));
3576                         if (collision && nohisaddr) {
3577                                 /* collision, hisaddr unknown - Conf-Rej */
3578                                 type = CONF_REJ;
3579                                 bzero(&p[2], 8);
3580                         } else {
3581                                 /*
3582                                  * - no collision, hisaddr unknown, or
3583                                  * - collision, hisaddr known
3584                                  * Conf-Nak, suggest hisaddr
3585                                  */
3586                                 type = CONF_NAK;
3587                                 sppp_suggest_ip6_addr(sp, &suggestaddr);
3588                                 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3589                         }
3590                         if (debug)
3591                                 log(-1, " %s [%s]",
3592                                     ip6_sprintf(ip6buf, &desiredaddr),
3593                                     sppp_cp_type_name(type));
3594                         break;
3595                 }
3596                 /* Add the option to nak'ed list. */
3597                 bcopy (p, r, p[1]);
3598                 r += p[1];
3599                 rlen += p[1];
3600         }
3601
3602         if (rlen == 0 && type == CONF_ACK) {
3603                 if (debug)
3604                         log(-1, " send %s\n", sppp_cp_type_name(type));
3605                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
3606         } else {
3607 #ifdef DIAGNOSTIC
3608                 if (type == CONF_ACK)
3609                         panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3610 #endif
3611
3612                 if (debug) {
3613                         log(-1, " send %s suggest %s\n",
3614                             sppp_cp_type_name(type),
3615                             ip6_sprintf(ip6buf, &suggestaddr));
3616                 }
3617                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3618         }
3619
3620  end:
3621         free (buf, M_TEMP);
3622         return (rlen == 0);
3623 }
3624
3625 /*
3626  * Analyze the IPv6CP Configure-Reject option list, and adjust our
3627  * negotiation.
3628  */
3629 static void
3630 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3631 {
3632         u_char *buf, *p;
3633         struct ifnet *ifp = SP2IFP(sp);
3634         int debug = ifp->if_flags & IFF_DEBUG;
3635
3636         len -= 4;
3637         buf = malloc (len, M_TEMP, M_NOWAIT);
3638         if (!buf)
3639                 return;
3640
3641         if (debug)
3642                 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
3643                     SPP_ARGS(ifp));
3644
3645         p = (void*) (h+1);
3646         for (; len >= 2 && p[1] >= 2 && len >= p[1];
3647             len -= p[1], p += p[1]) {
3648                 if (debug)
3649                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3650                 switch (*p) {
3651                 case IPV6CP_OPT_IFID:
3652                         /*
3653                          * Peer doesn't grok address option.  This is
3654                          * bad.  XXX  Should we better give up here?
3655                          */
3656                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3657                         break;
3658 #ifdef notyet
3659                 case IPV6CP_OPT_COMPRESS:
3660                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3661                         break;
3662 #endif
3663                 }
3664         }
3665         if (debug)
3666                 log(-1, "\n");
3667         free (buf, M_TEMP);
3668         return;
3669 }
3670
3671 /*
3672  * Analyze the IPv6CP Configure-NAK option list, and adjust our
3673  * negotiation.
3674  */
3675 static void
3676 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3677 {
3678         u_char *buf, *p;
3679         struct ifnet *ifp = SP2IFP(sp);
3680         int debug = ifp->if_flags & IFF_DEBUG;
3681         struct in6_addr suggestaddr;
3682         char ip6buf[INET6_ADDRSTRLEN];
3683
3684         len -= 4;
3685         buf = malloc (len, M_TEMP, M_NOWAIT);
3686         if (!buf)
3687                 return;
3688
3689         if (debug)
3690                 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:",
3691                     SPP_ARGS(ifp));
3692
3693         p = (void*) (h+1);
3694         for (; len >= 2 && p[1] >= 2 && len >= p[1];
3695             len -= p[1], p += p[1]) {
3696                 if (debug)
3697                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3698                 switch (*p) {
3699                 case IPV6CP_OPT_IFID:
3700                         /*
3701                          * Peer doesn't like our local ifid.  See
3702                          * if we can do something for him.  We'll drop
3703                          * him our address then.
3704                          */
3705                         if (len < 10 || p[1] != 10)
3706                                 break;
3707                         bzero(&suggestaddr, sizeof(suggestaddr));
3708                         suggestaddr.s6_addr16[0] = htons(0xfe80);
3709                         (void)in6_setscope(&suggestaddr, SP2IFP(sp), NULL);
3710                         bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3711
3712                         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3713                         if (debug)
3714                                 log(-1, " [suggestaddr %s]",
3715                                        ip6_sprintf(ip6buf, &suggestaddr));
3716 #ifdef IPV6CP_MYIFID_DYN
3717                         /*
3718                          * When doing dynamic address assignment,
3719                          * we accept his offer.
3720                          */
3721                         if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3722                                 struct in6_addr lastsuggest;
3723                                 /*
3724                                  * If <suggested myaddr from peer> equals to
3725                                  * <hisaddr we have suggested last time>,
3726                                  * we have a collision.  generate new random
3727                                  * ifid.
3728                                  */
3729                                 sppp_suggest_ip6_addr(&lastsuggest);
3730                                 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
3731                                                        lastsuggest)) {
3732                                         if (debug)
3733                                                 log(-1, " [random]");
3734                                         sppp_gen_ip6_addr(sp, &suggestaddr);
3735                                 }
3736                                 sppp_set_ip6_addr(sp, &suggestaddr, 0);
3737                                 if (debug)
3738                                         log(-1, " [agree]");
3739                                 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3740                         }
3741 #else
3742                         /*
3743                          * Since we do not do dynamic address assignment,
3744                          * we ignore it and thus continue to negotiate
3745                          * our already existing value.  This can possibly
3746                          * go into infinite request-reject loop.
3747                          *
3748                          * This is not likely because we normally use
3749                          * ifid based on MAC-address.
3750                          * If you have no ethernet card on the node, too bad.
3751                          * XXX should we use fail_counter?
3752                          */
3753 #endif
3754                         break;
3755 #ifdef notyet
3756                 case IPV6CP_OPT_COMPRESS:
3757                         /*
3758                          * Peer wants different compression parameters.
3759                          */
3760                         break;
3761 #endif
3762                 }
3763         }
3764         if (debug)
3765                 log(-1, "\n");
3766         free (buf, M_TEMP);
3767         return;
3768 }
3769 static void
3770 sppp_ipv6cp_tlu(struct sppp *sp)
3771 {
3772         /* we are up - notify isdn daemon */
3773         if (sp->pp_con)
3774                 sp->pp_con(sp);
3775 }
3776
3777 static void
3778 sppp_ipv6cp_tld(struct sppp *sp)
3779 {
3780 }
3781
3782 static void
3783 sppp_ipv6cp_tls(struct sppp *sp)
3784 {
3785         /* indicate to LCP that it must stay alive */
3786         sp->lcp.protos |= (1 << IDX_IPV6CP);
3787 }
3788
3789 static void
3790 sppp_ipv6cp_tlf(struct sppp *sp)
3791 {
3792
3793 #if 0   /* need #if 0 to close IPv6CP properly */
3794         /* we no longer need LCP */
3795         sp->lcp.protos &= ~(1 << IDX_IPV6CP);
3796         sppp_lcp_check_and_close(sp);
3797 #endif
3798 }
3799
3800 static void
3801 sppp_ipv6cp_scr(struct sppp *sp)
3802 {
3803         char opt[10 /* ifid */ + 4 /* compression, minimum */];
3804         struct in6_addr ouraddr;
3805         int i = 0;
3806
3807         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
3808                 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
3809                 opt[i++] = IPV6CP_OPT_IFID;
3810                 opt[i++] = 10;
3811                 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
3812                 i += 8;
3813         }
3814
3815 #ifdef notyet
3816         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
3817                 opt[i++] = IPV6CP_OPT_COMPRESSION;
3818                 opt[i++] = 4;
3819                 opt[i++] = 0;   /* TBD */
3820                 opt[i++] = 0;   /* TBD */
3821                 /* variable length data may follow */
3822         }
3823 #endif
3824
3825         sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
3826         sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt);
3827 }
3828 #else /*INET6*/
3829 static void sppp_ipv6cp_init(struct sppp *sp)
3830 {
3831 }
3832
3833 static void sppp_ipv6cp_up(struct sppp *sp)
3834 {
3835 }
3836
3837 static void sppp_ipv6cp_down(struct sppp *sp)
3838 {
3839 }
3840
3841
3842 static void sppp_ipv6cp_open(struct sppp *sp)
3843 {
3844 }
3845
3846 static void sppp_ipv6cp_close(struct sppp *sp)
3847 {
3848 }
3849
3850 static void sppp_ipv6cp_TO(void *sp)
3851 {
3852 }
3853
3854 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3855 {
3856         return 0;
3857 }
3858
3859 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3860 {
3861 }
3862
3863 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3864 {
3865 }
3866
3867 static void sppp_ipv6cp_tlu(struct sppp *sp)
3868 {
3869 }
3870
3871 static void sppp_ipv6cp_tld(struct sppp *sp)
3872 {
3873 }
3874
3875 static void sppp_ipv6cp_tls(struct sppp *sp)
3876 {
3877 }
3878
3879 static void sppp_ipv6cp_tlf(struct sppp *sp)
3880 {
3881 }
3882
3883 static void sppp_ipv6cp_scr(struct sppp *sp)
3884 {
3885 }
3886 #endif /*INET6*/
3887
3888 /*
3889  *--------------------------------------------------------------------------*
3890  *                                                                          *
3891  *                        The CHAP implementation.                          *
3892  *                                                                          *
3893  *--------------------------------------------------------------------------*
3894  */
3895
3896 /*
3897  * The authentication protocols don't employ a full-fledged state machine as
3898  * the control protocols do, since they do have Open and Close events, but
3899  * not Up and Down, nor are they explicitly terminated.  Also, use of the
3900  * authentication protocols may be different in both directions (this makes
3901  * sense, think of a machine that never accepts incoming calls but only
3902  * calls out, it doesn't require the called party to authenticate itself).
3903  *
3904  * Our state machine for the local authentication protocol (we are requesting
3905  * the peer to authenticate) looks like:
3906  *
3907  *                                                  RCA-
3908  *            +--------------------------------------------+
3909  *            V                                     scn,tld|
3910  *        +--------+                           Close   +---------+ RCA+
3911  *        |        |<----------------------------------|         |------+
3912  *   +--->| Closed |                            TO*    | Opened  | sca  |
3913  *   |    |        |-----+                     +-------|         |<-----+
3914  *   |    +--------+ irc |                     |       +---------+
3915  *   |      ^            |                     |           ^
3916  *   |      |            |                     |           |
3917  *   |      |            |                     |           |
3918  *   |   TO-|            |                     |           |
3919  *   |      |tld  TO+    V                     |           |
3920  *   |      |   +------->+                     |           |
3921  *   |      |   |        |                     |           |
3922  *   |    +--------+     V                     |           |
3923  *   |    |        |<----+<--------------------+           |
3924  *   |    | Req-   | scr                                   |
3925  *   |    | Sent   |                                       |
3926  *   |    |        |                                       |
3927  *   |    +--------+                                       |
3928  *   | RCA- |   | RCA+                                     |
3929  *   +------+   +------------------------------------------+
3930  *   scn,tld      sca,irc,ict,tlu
3931  *
3932  *
3933  *   with:
3934  *
3935  *      Open:   LCP reached authentication phase
3936  *      Close:  LCP reached terminate phase
3937  *
3938  *      RCA+:   received reply (pap-req, chap-response), acceptable
3939  *      RCN:    received reply (pap-req, chap-response), not acceptable
3940  *      TO+:    timeout with restart counter >= 0
3941  *      TO-:    timeout with restart counter < 0
3942  *      TO*:    reschedule timeout for CHAP
3943  *
3944  *      scr:    send request packet (none for PAP, chap-challenge)
3945  *      sca:    send ack packet (pap-ack, chap-success)
3946  *      scn:    send nak packet (pap-nak, chap-failure)
3947  *      ict:    initialize re-challenge timer (CHAP only)
3948  *
3949  *      tlu:    this-layer-up, LCP reaches network phase
3950  *      tld:    this-layer-down, LCP enters terminate phase
3951  *
3952  * Note that in CHAP mode, after sending a new challenge, while the state
3953  * automaton falls back into Req-Sent state, it doesn't signal a tld
3954  * event to LCP, so LCP remains in network phase.  Only after not getting
3955  * any response (or after getting an unacceptable response), CHAP closes,
3956  * causing LCP to enter terminate phase.
3957  *
3958  * With PAP, there is no initial request that can be sent.  The peer is
3959  * expected to send one based on the successful negotiation of PAP as
3960  * the authentication protocol during the LCP option negotiation.
3961  *
3962  * Incoming authentication protocol requests (remote requests
3963  * authentication, we are peer) don't employ a state machine at all,
3964  * they are simply answered.  Some peers [Ascend P50 firmware rev
3965  * 4.50] react allergically when sending IPCP requests while they are
3966  * still in authentication phase (thereby violating the standard that
3967  * demands that these NCP packets are to be discarded), so we keep
3968  * track of the peer demanding us to authenticate, and only proceed to
3969  * phase network once we've seen a positive acknowledge for the
3970  * authentication.
3971  */
3972
3973 /*
3974  * Handle incoming CHAP packets.
3975  */
3976 static void
3977 sppp_chap_input(struct sppp *sp, struct mbuf *m)
3978 {
3979         STDDCL;
3980         struct lcp_header *h;
3981         int len;
3982         u_char *value, *name, digest[AUTHKEYLEN], dsize;
3983         int value_len, name_len;
3984         MD5_CTX ctx;
3985
3986         len = m->m_pkthdr.len;
3987         if (len < 4) {
3988                 if (debug)
3989                         log(LOG_DEBUG,
3990                             SPP_FMT "chap invalid packet length: %d bytes\n",
3991                             SPP_ARGS(ifp), len);
3992                 return;
3993         }
3994         h = mtod (m, struct lcp_header*);
3995         if (len > ntohs (h->len))
3996                 len = ntohs (h->len);
3997
3998         switch (h->type) {
3999         /* challenge, failure and success are his authproto */
4000         case CHAP_CHALLENGE:
4001                 value = 1 + (u_char*)(h+1);
4002                 value_len = value[-1];
4003                 name = value + value_len;
4004                 name_len = len - value_len - 5;
4005                 if (name_len < 0) {
4006                         if (debug) {
4007                                 log(LOG_DEBUG,
4008                                     SPP_FMT "chap corrupted challenge "
4009                                     "<%s id=0x%x len=%d",
4010                                     SPP_ARGS(ifp),
4011                                     sppp_auth_type_name(PPP_CHAP, h->type),
4012                                     h->ident, ntohs(h->len));
4013                                 sppp_print_bytes((u_char*) (h+1), len-4);
4014                                 log(-1, ">\n");
4015                         }
4016                         break;
4017                 }
4018
4019                 if (debug) {
4020                         log(LOG_DEBUG,
4021                             SPP_FMT "chap input <%s id=0x%x len=%d name=",
4022                             SPP_ARGS(ifp),
4023                             sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
4024                             ntohs(h->len));
4025                         sppp_print_string((char*) name, name_len);
4026                         log(-1, " value-size=%d value=", value_len);
4027                         sppp_print_bytes(value, value_len);
4028                         log(-1, ">\n");
4029                 }
4030
4031                 /* Compute reply value. */
4032                 MD5Init(&ctx);
4033                 MD5Update(&ctx, &h->ident, 1);
4034                 MD5Update(&ctx, sp->myauth.secret,
4035                           sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
4036                 MD5Update(&ctx, value, value_len);
4037                 MD5Final(digest, &ctx);
4038                 dsize = sizeof digest;
4039
4040                 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
4041                                sizeof dsize, (const char *)&dsize,
4042                                sizeof digest, digest,
4043                                (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4044                                sp->myauth.name,
4045                                0);
4046                 break;
4047
4048         case CHAP_SUCCESS:
4049                 if (debug) {
4050                         log(LOG_DEBUG, SPP_FMT "chap success",
4051                             SPP_ARGS(ifp));
4052                         if (len > 4) {
4053                                 log(-1, ": ");
4054                                 sppp_print_string((char*)(h + 1), len - 4);
4055                         }
4056                         log(-1, "\n");
4057                 }
4058                 SPPP_LOCK(sp);
4059                 sp->pp_flags &= ~PP_NEEDAUTH;
4060                 if (sp->myauth.proto == PPP_CHAP &&
4061                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4062                     (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
4063                         /*
4064                          * We are authenticator for CHAP but didn't
4065                          * complete yet.  Leave it to tlu to proceed
4066                          * to network phase.
4067                          */
4068                         SPPP_UNLOCK(sp);
4069                         break;
4070                 }
4071                 SPPP_UNLOCK(sp);
4072                 sppp_phase_network(sp);
4073                 break;
4074
4075         case CHAP_FAILURE:
4076                 if (debug) {
4077                         log(LOG_INFO, SPP_FMT "chap failure",
4078                             SPP_ARGS(ifp));
4079                         if (len > 4) {
4080                                 log(-1, ": ");
4081                                 sppp_print_string((char*)(h + 1), len - 4);
4082                         }
4083                         log(-1, "\n");
4084                 } else
4085                         log(LOG_INFO, SPP_FMT "chap failure\n",
4086                             SPP_ARGS(ifp));
4087                 /* await LCP shutdown by authenticator */
4088                 break;
4089
4090         /* response is my authproto */
4091         case CHAP_RESPONSE:
4092                 value = 1 + (u_char*)(h+1);
4093                 value_len = value[-1];
4094                 name = value + value_len;
4095                 name_len = len - value_len - 5;
4096                 if (name_len < 0) {
4097                         if (debug) {
4098                                 log(LOG_DEBUG,
4099                                     SPP_FMT "chap corrupted response "
4100                                     "<%s id=0x%x len=%d",
4101                                     SPP_ARGS(ifp),
4102                                     sppp_auth_type_name(PPP_CHAP, h->type),
4103                                     h->ident, ntohs(h->len));
4104                                 sppp_print_bytes((u_char*)(h+1), len-4);
4105                                 log(-1, ">\n");
4106                         }
4107                         break;
4108                 }
4109                 if (h->ident != sp->confid[IDX_CHAP]) {
4110                         if (debug)
4111                                 log(LOG_DEBUG,
4112                                     SPP_FMT "chap dropping response for old ID "
4113                                     "(got %d, expected %d)\n",
4114                                     SPP_ARGS(ifp),
4115                                     h->ident, sp->confid[IDX_CHAP]);
4116                         break;
4117                 }
4118                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
4119                     || bcmp(name, sp->hisauth.name, name_len) != 0) {
4120                         log(LOG_INFO, SPP_FMT "chap response, his name ",
4121                             SPP_ARGS(ifp));
4122                         sppp_print_string(name, name_len);
4123                         log(-1, " != expected ");
4124                         sppp_print_string(sp->hisauth.name,
4125                                           sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
4126                         log(-1, "\n");
4127                 }
4128                 if (debug) {
4129                         log(LOG_DEBUG, SPP_FMT "chap input(%s) "
4130                             "<%s id=0x%x len=%d name=",
4131                             SPP_ARGS(ifp),
4132                             sppp_state_name(sp->state[IDX_CHAP]),
4133                             sppp_auth_type_name(PPP_CHAP, h->type),
4134                             h->ident, ntohs (h->len));
4135                         sppp_print_string((char*)name, name_len);
4136                         log(-1, " value-size=%d value=", value_len);
4137                         sppp_print_bytes(value, value_len);
4138                         log(-1, ">\n");
4139                 }
4140                 if (value_len != AUTHKEYLEN) {
4141                         if (debug)
4142                                 log(LOG_DEBUG,
4143                                     SPP_FMT "chap bad hash value length: "
4144                                     "%d bytes, should be %d\n",
4145                                     SPP_ARGS(ifp), value_len,
4146                                     AUTHKEYLEN);
4147                         break;
4148                 }
4149
4150                 MD5Init(&ctx);
4151                 MD5Update(&ctx, &h->ident, 1);
4152                 MD5Update(&ctx, sp->hisauth.secret,
4153                           sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
4154                 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
4155                 MD5Final(digest, &ctx);
4156
4157 #define FAILMSG "Failed..."
4158 #define SUCCMSG "Welcome!"
4159
4160                 if (value_len != sizeof digest ||
4161                     bcmp(digest, value, value_len) != 0) {
4162                         /* action scn, tld */
4163                         sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
4164                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4165                                        0);
4166                         chap.tld(sp);
4167                         break;
4168                 }
4169                 /* action sca, perhaps tlu */
4170                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
4171                     sp->state[IDX_CHAP] == STATE_OPENED)
4172                         sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
4173                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4174                                        0);
4175                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
4176                         sppp_cp_change_state(&chap, sp, STATE_OPENED);
4177                         chap.tlu(sp);
4178                 }
4179                 break;
4180
4181         default:
4182                 /* Unknown CHAP packet type -- ignore. */
4183                 if (debug) {
4184                         log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
4185                             "<0x%x id=0x%xh len=%d",
4186                             SPP_ARGS(ifp),
4187                             sppp_state_name(sp->state[IDX_CHAP]),
4188                             h->type, h->ident, ntohs(h->len));
4189                         sppp_print_bytes((u_char*)(h+1), len-4);
4190                         log(-1, ">\n");
4191                 }
4192                 break;
4193
4194         }
4195 }
4196
4197 static void
4198 sppp_chap_init(struct sppp *sp)
4199 {
4200         /* Chap doesn't have STATE_INITIAL at all. */
4201         sp->state[IDX_CHAP] = STATE_CLOSED;
4202         sp->fail_counter[IDX_CHAP] = 0;
4203         sp->pp_seq[IDX_CHAP] = 0;
4204         sp->pp_rseq[IDX_CHAP] = 0;
4205         callout_init(&sp->ch[IDX_CHAP], 1);
4206 }
4207
4208 static void
4209 sppp_chap_open(struct sppp *sp)
4210 {
4211         if (sp->myauth.proto == PPP_CHAP &&
4212             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4213                 /* we are authenticator for CHAP, start it */
4214                 chap.scr(sp);
4215                 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4216                 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4217         }
4218         /* nothing to be done if we are peer, await a challenge */
4219 }
4220
4221 static void
4222 sppp_chap_close(struct sppp *sp)
4223 {
4224         if (sp->state[IDX_CHAP] != STATE_CLOSED)
4225                 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4226 }
4227
4228 static void
4229 sppp_chap_TO(void *cookie)
4230 {
4231         struct sppp *sp = (struct sppp *)cookie;
4232         STDDCL;
4233
4234         SPPP_LOCK(sp);
4235         if (debug)
4236                 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
4237                     SPP_ARGS(ifp),
4238                     sppp_state_name(sp->state[IDX_CHAP]),
4239                     sp->rst_counter[IDX_CHAP]);
4240
4241         if (--sp->rst_counter[IDX_CHAP] < 0)
4242                 /* TO- event */
4243                 switch (sp->state[IDX_CHAP]) {
4244                 case STATE_REQ_SENT:
4245                         chap.tld(sp);
4246                         sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4247                         break;
4248                 }
4249         else
4250                 /* TO+ (or TO*) event */
4251                 switch (sp->state[IDX_CHAP]) {
4252                 case STATE_OPENED:
4253                         /* TO* event */
4254                         sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4255                         /* FALLTHROUGH */
4256                 case STATE_REQ_SENT:
4257                         chap.scr(sp);
4258                         /* sppp_cp_change_state() will restart the timer */
4259                         sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4260                         break;
4261                 }
4262
4263         SPPP_UNLOCK(sp);
4264 }
4265
4266 static void
4267 sppp_chap_tlu(struct sppp *sp)
4268 {
4269         STDDCL;
4270         int i;
4271
4272         i = 0;
4273         sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4274
4275         /*
4276          * Some broken CHAP implementations (Conware CoNet, firmware
4277          * 4.0.?) don't want to re-authenticate their CHAP once the
4278          * initial challenge-response exchange has taken place.
4279          * Provide for an option to avoid rechallenges.
4280          */
4281         if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
4282                 /*
4283                  * Compute the re-challenge timeout.  This will yield
4284                  * a number between 300 and 810 seconds.
4285                  */
4286                 i = 300 + ((unsigned)(random() & 0xff00) >> 7);
4287                 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, (void *)sp);
4288         }
4289
4290         if (debug) {
4291                 log(LOG_DEBUG,
4292                     SPP_FMT "chap %s, ",
4293                     SPP_ARGS(ifp),
4294                     sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
4295                 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
4296                         log(-1, "next re-challenge in %d seconds\n", i);
4297                 else
4298                         log(-1, "re-challenging suppressed\n");
4299         }
4300
4301         SPPP_LOCK(sp);
4302         /* indicate to LCP that we need to be closed down */
4303         sp->lcp.protos |= (1 << IDX_CHAP);
4304
4305         if (sp->pp_flags & PP_NEEDAUTH) {
4306                 /*
4307                  * Remote is authenticator, but his auth proto didn't
4308                  * complete yet.  Defer the transition to network
4309                  * phase.
4310                  */
4311                 SPPP_UNLOCK(sp);
4312                 return;
4313         }
4314         SPPP_UNLOCK(sp);
4315
4316         /*
4317          * If we are already in phase network, we are done here.  This
4318          * is the case if this is a dummy tlu event after a re-challenge.
4319          */
4320         if (sp->pp_phase != PHASE_NETWORK)
4321                 sppp_phase_network(sp);
4322 }
4323
4324 static void
4325 sppp_chap_tld(struct sppp *sp)
4326 {
4327         STDDCL;
4328
4329         if (debug)
4330                 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
4331         callout_stop(&sp->ch[IDX_CHAP]);
4332         sp->lcp.protos &= ~(1 << IDX_CHAP);
4333
4334         lcp.Close(sp);
4335 }
4336
4337 static void
4338 sppp_chap_scr(struct sppp *sp)
4339 {
4340         u_long *ch;
4341         u_char clen;
4342
4343         /* Compute random challenge. */
4344         ch = (u_long *)sp->myauth.challenge;
4345         arc4random_buf(ch, 4 * sizeof(*ch));
4346         clen = AUTHKEYLEN;
4347
4348         sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP];
4349
4350         sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
4351                        sizeof clen, (const char *)&clen,
4352                        (size_t)AUTHKEYLEN, sp->myauth.challenge,
4353                        (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4354                        sp->myauth.name,
4355                        0);
4356 }
4357
4358 /*
4359  *--------------------------------------------------------------------------*
4360  *                                                                          *
4361  *                        The PAP implementation.                           *
4362  *                                                                          *
4363  *--------------------------------------------------------------------------*
4364  */
4365 /*
4366  * For PAP, we need to keep a little state also if we are the peer, not the
4367  * authenticator.  This is since we don't get a request to authenticate, but
4368  * have to repeatedly authenticate ourself until we got a response (or the
4369  * retry counter is expired).
4370  */
4371
4372 /*
4373  * Handle incoming PAP packets.  */
4374 static void
4375 sppp_pap_input(struct sppp *sp, struct mbuf *m)
4376 {
4377         STDDCL;
4378         struct lcp_header *h;
4379         int len;
4380         u_char *name, *passwd, mlen;
4381         int name_len, passwd_len;
4382
4383         len = m->m_pkthdr.len;
4384         if (len < 5) {
4385                 if (debug)
4386                         log(LOG_DEBUG,
4387                             SPP_FMT "pap invalid packet length: %d bytes\n",
4388                             SPP_ARGS(ifp), len);
4389                 return;
4390         }
4391         h = mtod (m, struct lcp_header*);
4392         if (len > ntohs (h->len))
4393                 len = ntohs (h->len);
4394         switch (h->type) {
4395         /* PAP request is my authproto */
4396         case PAP_REQ:
4397                 name = 1 + (u_char*)(h+1);
4398                 name_len = name[-1];
4399                 passwd = name + name_len + 1;
4400                 if (name_len > len - 6 ||
4401                     (passwd_len = passwd[-1]) > len - 6 - name_len) {
4402                         if (debug) {
4403                                 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4404                                     "<%s id=0x%x len=%d",
4405                                     SPP_ARGS(ifp),
4406                                     sppp_auth_type_name(PPP_PAP, h->type),
4407                                     h->ident, ntohs(h->len));
4408                                 sppp_print_bytes((u_char*)(h+1), len-4);
4409                                 log(-1, ">\n");
4410                         }
4411                         break;
4412                 }
4413                 if (debug) {
4414                         log(LOG_DEBUG, SPP_FMT "pap input(%s) "
4415                             "<%s id=0x%x len=%d name=",
4416                             SPP_ARGS(ifp),
4417                             sppp_state_name(sp->state[IDX_PAP]),
4418                             sppp_auth_type_name(PPP_PAP, h->type),
4419                             h->ident, ntohs(h->len));
4420                         sppp_print_string((char*)name, name_len);
4421                         log(-1, " passwd=");
4422                         sppp_print_string((char*)passwd, passwd_len);
4423                         log(-1, ">\n");
4424                 }
4425                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) ||
4426                     passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) ||
4427                     bcmp(name, sp->hisauth.name, name_len) != 0 ||
4428                     bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
4429                         /* action scn, tld */
4430                         mlen = sizeof(FAILMSG) - 1;
4431                         sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
4432                                        sizeof mlen, (const char *)&mlen,
4433                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4434                                        0);
4435                         pap.tld(sp);
4436                         break;
4437                 }
4438                 /* action sca, perhaps tlu */
4439                 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
4440                     sp->state[IDX_PAP] == STATE_OPENED) {
4441                         mlen = sizeof(SUCCMSG) - 1;
4442                         sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
4443                                        sizeof mlen, (const char *)&mlen,
4444                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4445                                        0);
4446                 }
4447                 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
4448                         sppp_cp_change_state(&pap, sp, STATE_OPENED);
4449                         pap.tlu(sp);
4450                 }
4451                 break;
4452
4453         /* ack and nak are his authproto */
4454         case PAP_ACK:
4455                 callout_stop(&sp->pap_my_to_ch);
4456                 if (debug) {
4457                         log(LOG_DEBUG, SPP_FMT "pap success",
4458                             SPP_ARGS(ifp));
4459                         name_len = *((char *)h);
4460                         if (len > 5 && name_len) {
4461                                 log(-1, ": ");
4462                                 sppp_print_string((char*)(h+1), name_len);
4463                         }
4464                         log(-1, "\n");
4465                 }
4466                 SPPP_LOCK(sp);
4467                 sp->pp_flags &= ~PP_NEEDAUTH;
4468                 if (sp->myauth.proto == PPP_PAP &&
4469                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4470                     (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
4471                         /*
4472                          * We are authenticator for PAP but didn't
4473                          * complete yet.  Leave it to tlu to proceed
4474                          * to network phase.
4475                          */
4476                         SPPP_UNLOCK(sp);
4477                         break;
4478                 }
4479                 SPPP_UNLOCK(sp);
4480                 sppp_phase_network(sp);
4481                 break;
4482
4483         case PAP_NAK:
4484                 callout_stop (&sp->pap_my_to_ch);
4485                 if (debug) {
4486                         log(LOG_INFO, SPP_FMT "pap failure",
4487                             SPP_ARGS(ifp));
4488                         name_len = *((char *)h);
4489                         if (len > 5 && name_len) {
4490                                 log(-1, ": ");
4491                                 sppp_print_string((char*)(h+1), name_len);
4492                         }
4493                         log(-1, "\n");
4494                 } else
4495                         log(LOG_INFO, SPP_FMT "pap failure\n",
4496                             SPP_ARGS(ifp));
4497                 /* await LCP shutdown by authenticator */
4498                 break;
4499
4500         default:
4501                 /* Unknown PAP packet type -- ignore. */
4502                 if (debug) {
4503                         log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4504                             "<0x%x id=0x%x len=%d",
4505                             SPP_ARGS(ifp),
4506                             h->type, h->ident, ntohs(h->len));
4507                         sppp_print_bytes((u_char*)(h+1), len-4);
4508                         log(-1, ">\n");
4509                 }
4510                 break;
4511
4512         }
4513 }
4514
4515 static void
4516 sppp_pap_init(struct sppp *sp)
4517 {
4518         /* PAP doesn't have STATE_INITIAL at all. */
4519         sp->state[IDX_PAP] = STATE_CLOSED;
4520         sp->fail_counter[IDX_PAP] = 0;
4521         sp->pp_seq[IDX_PAP] = 0;
4522         sp->pp_rseq[IDX_PAP] = 0;
4523         callout_init(&sp->ch[IDX_PAP], 1);
4524         callout_init(&sp->pap_my_to_ch, 1);
4525 }
4526
4527 static void
4528 sppp_pap_open(struct sppp *sp)
4529 {
4530         if (sp->hisauth.proto == PPP_PAP &&
4531             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4532                 /* we are authenticator for PAP, start our timer */
4533                 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4534                 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4535         }
4536         if (sp->myauth.proto == PPP_PAP) {
4537                 /* we are peer, send a request, and start a timer */
4538                 pap.scr(sp);
4539                 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout,
4540                               sppp_pap_my_TO, (void *)sp);
4541         }
4542 }
4543
4544 static void
4545 sppp_pap_close(struct sppp *sp)
4546 {
4547         if (sp->state[IDX_PAP] != STATE_CLOSED)
4548                 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4549 }
4550
4551 /*
4552  * That's the timeout routine if we are authenticator.  Since the
4553  * authenticator is basically passive in PAP, we can't do much here.
4554  */
4555 static void
4556 sppp_pap_TO(void *cookie)
4557 {
4558         struct sppp *sp = (struct sppp *)cookie;
4559         STDDCL;
4560
4561         SPPP_LOCK(sp);
4562         if (debug)
4563                 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
4564                     SPP_ARGS(ifp),
4565                     sppp_state_name(sp->state[IDX_PAP]),
4566                     sp->rst_counter[IDX_PAP]);
4567
4568         if (--sp->rst_counter[IDX_PAP] < 0)
4569                 /* TO- event */
4570                 switch (sp->state[IDX_PAP]) {
4571                 case STATE_REQ_SENT:
4572                         pap.tld(sp);
4573                         sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4574                         break;
4575                 }
4576         else
4577                 /* TO+ event, not very much we could do */
4578                 switch (sp->state[IDX_PAP]) {
4579                 case STATE_REQ_SENT:
4580                         /* sppp_cp_change_state() will restart the timer */
4581                         sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4582                         break;
4583                 }
4584
4585         SPPP_UNLOCK(sp);
4586 }
4587
4588 /*
4589  * That's the timeout handler if we are peer.  Since the peer is active,
4590  * we need to retransmit our PAP request since it is apparently lost.
4591  * XXX We should impose a max counter.
4592  */
4593 static void
4594 sppp_pap_my_TO(void *cookie)
4595 {
4596         struct sppp *sp = (struct sppp *)cookie;
4597         STDDCL;
4598
4599         if (debug)
4600                 log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
4601                     SPP_ARGS(ifp));
4602
4603         SPPP_LOCK(sp);
4604         pap.scr(sp);
4605         SPPP_UNLOCK(sp);
4606 }
4607
4608 static void
4609 sppp_pap_tlu(struct sppp *sp)
4610 {
4611         STDDCL;
4612
4613         sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4614
4615         if (debug)
4616                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
4617                     SPP_ARGS(ifp), pap.name);
4618
4619         SPPP_LOCK(sp);
4620         /* indicate to LCP that we need to be closed down */
4621         sp->lcp.protos |= (1 << IDX_PAP);
4622
4623         if (sp->pp_flags & PP_NEEDAUTH) {
4624                 /*
4625                  * Remote is authenticator, but his auth proto didn't
4626                  * complete yet.  Defer the transition to network
4627                  * phase.
4628                  */
4629                 SPPP_UNLOCK(sp);
4630                 return;
4631         }
4632         SPPP_UNLOCK(sp);
4633         sppp_phase_network(sp);
4634 }
4635
4636 static void
4637 sppp_pap_tld(struct sppp *sp)
4638 {
4639         STDDCL;
4640
4641         if (debug)
4642                 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
4643         callout_stop (&sp->ch[IDX_PAP]);
4644         callout_stop (&sp->pap_my_to_ch);
4645         sp->lcp.protos &= ~(1 << IDX_PAP);
4646
4647         lcp.Close(sp);
4648 }
4649
4650 static void
4651 sppp_pap_scr(struct sppp *sp)
4652 {
4653         u_char idlen, pwdlen;
4654
4655         sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP];
4656         pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
4657         idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
4658
4659         sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
4660                        sizeof idlen, (const char *)&idlen,
4661                        (size_t)idlen, sp->myauth.name,
4662                        sizeof pwdlen, (const char *)&pwdlen,
4663                        (size_t)pwdlen, sp->myauth.secret,
4664                        0);
4665 }
4666
4667 /*
4668  * Random miscellaneous functions.
4669  */
4670
4671 /*
4672  * Send a PAP or CHAP proto packet.
4673  *
4674  * Varadic function, each of the elements for the ellipsis is of type
4675  * ``size_t mlen, const u_char *msg''.  Processing will stop iff
4676  * mlen == 0.
4677  * NOTE: never declare variadic functions with types subject to type
4678  * promotion (i.e. u_char). This is asking for big trouble depending
4679  * on the architecture you are on...
4680  */
4681
4682 static void
4683 sppp_auth_send(const struct cp *cp, struct sppp *sp,
4684                unsigned int type, unsigned int id,
4685                ...)
4686 {
4687         STDDCL;
4688         struct ppp_header *h;
4689         struct lcp_header *lh;
4690         struct mbuf *m;
4691         u_char *p;
4692         int len;
4693         unsigned int mlen;
4694         const char *msg;
4695         va_list ap;
4696
4697         MGETHDR (m, M_NOWAIT, MT_DATA);
4698         if (! m)
4699                 return;
4700         m->m_pkthdr.rcvif = 0;
4701
4702         h = mtod (m, struct ppp_header*);
4703         h->address = PPP_ALLSTATIONS;           /* broadcast address */
4704         h->control = PPP_UI;                    /* Unnumbered Info */
4705         h->protocol = htons(cp->proto);
4706
4707         lh = (struct lcp_header*)(h + 1);
4708         lh->type = type;
4709         lh->ident = id;
4710         p = (u_char*) (lh+1);
4711
4712         va_start(ap, id);
4713         len = 0;
4714
4715         while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) {
4716                 msg = va_arg(ap, const char *);
4717                 len += mlen;
4718                 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
4719                         va_end(ap);
4720                         m_freem(m);
4721                         return;
4722                 }
4723
4724                 bcopy(msg, p, mlen);
4725                 p += mlen;
4726         }
4727         va_end(ap);
4728
4729         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
4730         lh->len = htons (LCP_HEADER_LEN + len);
4731
4732         if (debug) {
4733                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
4734                     SPP_ARGS(ifp), cp->name,
4735                     sppp_auth_type_name(cp->proto, lh->type),
4736                     lh->ident, ntohs(lh->len));
4737                 sppp_print_bytes((u_char*) (lh+1), len);
4738                 log(-1, ">\n");
4739         }
4740         if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
4741                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
4742 }
4743
4744 /*
4745  * Flush interface queue.
4746  */
4747 static void
4748 sppp_qflush(struct ifqueue *ifq)
4749 {
4750         struct mbuf *m, *n;
4751
4752         n = ifq->ifq_head;
4753         while ((m = n)) {
4754                 n = m->m_nextpkt;
4755                 m_freem (m);
4756         }
4757         ifq->ifq_head = 0;
4758         ifq->ifq_tail = 0;
4759         ifq->ifq_len = 0;
4760 }
4761
4762 /*
4763  * Send keepalive packets, every 10 seconds.
4764  */
4765 static void
4766 sppp_keepalive(void *dummy)
4767 {
4768         struct sppp *sp = (struct sppp*)dummy;
4769         struct ifnet *ifp = SP2IFP(sp);
4770
4771         SPPP_LOCK(sp);
4772         /* Keepalive mode disabled or channel down? */
4773         if (! (sp->pp_flags & PP_KEEPALIVE) ||
4774             ! (ifp->if_drv_flags & IFF_DRV_RUNNING))
4775                 goto out;
4776
4777         if (sp->pp_mode == PP_FR) {
4778                 sppp_fr_keepalive (sp);
4779                 goto out;
4780         }
4781
4782         /* No keepalive in PPP mode if LCP not opened yet. */
4783         if (sp->pp_mode != IFF_CISCO &&
4784             sp->pp_phase < PHASE_AUTHENTICATE)
4785                 goto out;
4786
4787         if (sp->pp_alivecnt == MAXALIVECNT) {
4788                 /* No keepalive packets got.  Stop the interface. */
4789                 printf (SPP_FMT "down\n", SPP_ARGS(ifp));
4790                 if_down (ifp);
4791                 sppp_qflush (&sp->pp_cpq);
4792                 if (sp->pp_mode != IFF_CISCO) {
4793                         /* XXX */
4794                         /* Shut down the PPP link. */
4795                         lcp.Down(sp);
4796                         /* Initiate negotiation. XXX */
4797                         lcp.Up(sp);
4798                 }
4799         }
4800         if (sp->pp_alivecnt <= MAXALIVECNT)
4801                 ++sp->pp_alivecnt;
4802         if (sp->pp_mode == IFF_CISCO)
4803                 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ,
4804                          ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]);
4805         else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
4806                 uint32_t nmagic = htonl(sp->lcp.magic);
4807                 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP];
4808                 sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
4809                         sp->lcp.echoid, 4, &nmagic);
4810         }
4811 out:
4812         SPPP_UNLOCK(sp);
4813         callout_reset(&sp->keepalive_callout, hz * 10, sppp_keepalive,
4814                       (void *)sp);
4815 }
4816
4817 /*
4818  * Get both IP addresses.
4819  */
4820 void
4821 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
4822 {
4823         struct ifnet *ifp = SP2IFP(sp);
4824         struct ifaddr *ifa;
4825         struct sockaddr_in *si, *sm;
4826         u_long ssrc, ddst;
4827
4828         sm = NULL;
4829         ssrc = ddst = 0L;
4830         /*
4831          * Pick the first AF_INET address from the list,
4832          * aliases don't make any sense on a p2p link anyway.
4833          */
4834         si = NULL;
4835         if_addr_rlock(ifp);
4836         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4837                 if (ifa->ifa_addr->sa_family == AF_INET) {
4838                         si = (struct sockaddr_in *)ifa->ifa_addr;
4839                         sm = (struct sockaddr_in *)ifa->ifa_netmask;
4840                         if (si)
4841                                 break;
4842                 }
4843         if (ifa) {
4844                 if (si && si->sin_addr.s_addr) {
4845                         ssrc = si->sin_addr.s_addr;
4846                         if (srcmask)
4847                                 *srcmask = ntohl(sm->sin_addr.s_addr);
4848                 }
4849
4850                 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
4851                 if (si && si->sin_addr.s_addr)
4852                         ddst = si->sin_addr.s_addr;
4853         }
4854         if_addr_runlock(ifp);
4855
4856         if (dst) *dst = ntohl(ddst);
4857         if (src) *src = ntohl(ssrc);
4858 }
4859
4860 #ifdef INET
4861 /*
4862  * Set my IP address.
4863  */
4864 static void
4865 sppp_set_ip_addr(struct sppp *sp, u_long src)
4866 {
4867         STDDCL;
4868         struct ifaddr *ifa;
4869         struct sockaddr_in *si;
4870         struct in_ifaddr *ia;
4871
4872         /*
4873          * Pick the first AF_INET address from the list,
4874          * aliases don't make any sense on a p2p link anyway.
4875          */
4876         si = NULL;
4877         if_addr_rlock(ifp);
4878         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
4879                 if (ifa->ifa_addr->sa_family == AF_INET) {
4880                         si = (struct sockaddr_in *)ifa->ifa_addr;
4881                         if (si != NULL) {
4882                                 ifa_ref(ifa);
4883                                 break;
4884                         }
4885                 }
4886         }
4887         if_addr_runlock(ifp);
4888
4889         if (ifa != NULL) {
4890                 int error;
4891
4892                 /* delete old route */
4893                 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST);
4894                 if (debug && error) {
4895                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
4896                                 SPP_ARGS(ifp), error);
4897                 }
4898
4899                 /* set new address */
4900                 si->sin_addr.s_addr = htonl(src);
4901                 ia = ifatoia(ifa);
4902                 IN_IFADDR_WLOCK();
4903                 LIST_REMOVE(ia, ia_hash);
4904                 LIST_INSERT_HEAD(INADDR_HASH(si->sin_addr.s_addr), ia, ia_hash);
4905                 IN_IFADDR_WUNLOCK();
4906
4907                 /* add new route */
4908                 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST);
4909                 if (debug && error) {
4910                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
4911                                 SPP_ARGS(ifp), error);
4912                 }
4913                 ifa_free(ifa);
4914         }
4915 }
4916 #endif
4917
4918 #ifdef INET6
4919 /*
4920  * Get both IPv6 addresses.
4921  */
4922 static void
4923 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst,
4924                    struct in6_addr *srcmask)
4925 {
4926         struct ifnet *ifp = SP2IFP(sp);
4927         struct ifaddr *ifa;
4928         struct sockaddr_in6 *si, *sm;
4929         struct in6_addr ssrc, ddst;
4930
4931         sm = NULL;
4932         bzero(&ssrc, sizeof(ssrc));
4933         bzero(&ddst, sizeof(ddst));
4934         /*
4935          * Pick the first link-local AF_INET6 address from the list,
4936          * aliases don't make any sense on a p2p link anyway.
4937          */
4938         si = NULL;
4939         if_addr_rlock(ifp);
4940         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4941                 if (ifa->ifa_addr->sa_family == AF_INET6) {
4942                         si = (struct sockaddr_in6 *)ifa->ifa_addr;
4943                         sm = (struct sockaddr_in6 *)ifa->ifa_netmask;
4944                         if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr))
4945                                 break;
4946                 }
4947         if (ifa) {
4948                 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) {
4949                         bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc));
4950                         if (srcmask) {
4951                                 bcopy(&sm->sin6_addr, srcmask,
4952                                       sizeof(*srcmask));
4953                         }
4954                 }
4955
4956                 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
4957                 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr))
4958                         bcopy(&si->sin6_addr, &ddst, sizeof(ddst));
4959         }
4960
4961         if (dst)
4962                 bcopy(&ddst, dst, sizeof(*dst));
4963         if (src)
4964                 bcopy(&ssrc, src, sizeof(*src));
4965         if_addr_runlock(ifp);
4966 }
4967
4968 #ifdef IPV6CP_MYIFID_DYN
4969 /*
4970  * Generate random ifid.
4971  */
4972 static void
4973 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr)
4974 {
4975         /* TBD */
4976 }
4977
4978 /*
4979  * Set my IPv6 address.
4980  */
4981 static void
4982 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src)
4983 {
4984         STDDCL;
4985         struct ifaddr *ifa;
4986         struct sockaddr_in6 *sin6;
4987
4988         /*
4989          * Pick the first link-local AF_INET6 address from the list,
4990          * aliases don't make any sense on a p2p link anyway.
4991          */
4992
4993         sin6 = NULL;
4994         if_addr_rlock(ifp);
4995         CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
4996                 if (ifa->ifa_addr->sa_family == AF_INET6) {
4997                         sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
4998                         if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
4999                                 ifa_ref(ifa);
5000                                 break;
5001                         }
5002                 }
5003         }
5004         if_addr_runlock(ifp);
5005
5006         if (ifa != NULL) {
5007                 int error;
5008                 struct sockaddr_in6 new_sin6 = *sin6;
5009
5010                 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr));
5011                 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1);
5012                 if (debug && error) {
5013                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit "
5014                             " failed, error=%d\n", SPP_ARGS(ifp), error);
5015                 }
5016                 ifa_free(ifa);
5017         }
5018 }
5019 #endif
5020
5021 /*
5022  * Suggest a candidate address to be used by peer.
5023  */
5024 static void
5025 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest)
5026 {
5027         struct in6_addr myaddr;
5028         struct timeval tv;
5029
5030         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
5031
5032         myaddr.s6_addr[8] &= ~0x02;     /* u bit to "local" */
5033         microtime(&tv);
5034         if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) {
5035                 myaddr.s6_addr[14] ^= 0xff;
5036                 myaddr.s6_addr[15] ^= 0xff;
5037         } else {
5038                 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff);
5039                 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff);
5040         }
5041         if (suggest)
5042                 bcopy(&myaddr, suggest, sizeof(myaddr));
5043 }
5044 #endif /*INET6*/
5045
5046 static int
5047 sppp_params(struct sppp *sp, u_long cmd, void *data)
5048 {
5049         u_long subcmd;
5050         struct ifreq *ifr = (struct ifreq *)data;
5051         struct spppreq *spr;
5052         int rv = 0;
5053
5054         if ((spr = malloc(sizeof(struct spppreq), M_TEMP, M_NOWAIT)) == NULL)
5055                 return (EAGAIN);
5056         /*
5057          * ifr_data_get_ptr(ifr) is supposed to point to a struct spppreq.
5058          * Check the cmd word first before attempting to fetch all the
5059          * data.
5060          */
5061         rv = fueword(ifr_data_get_ptr(ifr), &subcmd);
5062         if (rv == -1) {
5063                 rv = EFAULT;
5064                 goto quit;
5065         }
5066
5067         if (copyin(ifr_data_get_ptr(ifr), spr, sizeof(struct spppreq)) != 0) {
5068                 rv = EFAULT;
5069                 goto quit;
5070         }
5071
5072         switch (subcmd) {
5073         case (u_long)SPPPIOGDEFS:
5074                 if (cmd != SIOCGIFGENERIC) {
5075                         rv = EINVAL;
5076                         break;
5077                 }
5078                 /*
5079                  * We copy over the entire current state, but clean
5080                  * out some of the stuff we don't wanna pass up.
5081                  * Remember, SIOCGIFGENERIC is unprotected, and can be
5082                  * called by any user.  No need to ever get PAP or
5083                  * CHAP secrets back to userland anyway.
5084                  */
5085                 spr->defs.pp_phase = sp->pp_phase;
5086                 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0;
5087                 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0;
5088                 spr->defs.lcp = sp->lcp;
5089                 spr->defs.ipcp = sp->ipcp;
5090                 spr->defs.ipv6cp = sp->ipv6cp;
5091                 spr->defs.myauth = sp->myauth;
5092                 spr->defs.hisauth = sp->hisauth;
5093                 bzero(spr->defs.myauth.secret, AUTHKEYLEN);
5094                 bzero(spr->defs.myauth.challenge, AUTHKEYLEN);
5095                 bzero(spr->defs.hisauth.secret, AUTHKEYLEN);
5096                 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN);
5097                 /*
5098                  * Fixup the LCP timeout value to milliseconds so
5099                  * spppcontrol doesn't need to bother about the value
5100                  * of "hz".  We do the reverse calculation below when
5101                  * setting it.
5102                  */
5103                 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz;
5104                 rv = copyout(spr, ifr_data_get_ptr(ifr),
5105                     sizeof(struct spppreq));
5106                 break;
5107
5108         case (u_long)SPPPIOSDEFS:
5109                 if (cmd != SIOCSIFGENERIC) {
5110                         rv = EINVAL;
5111                         break;
5112                 }
5113                 /*
5114                  * We have a very specific idea of which fields we
5115                  * allow being passed back from userland, so to not
5116                  * clobber our current state.  For one, we only allow
5117                  * setting anything if LCP is in dead or establish
5118                  * phase.  Once the authentication negotiations
5119                  * started, the authentication settings must not be
5120                  * changed again.  (The administrator can force an
5121                  * ifconfig down in order to get LCP back into dead
5122                  * phase.)
5123                  *
5124                  * Also, we only allow for authentication parameters to be
5125                  * specified.
5126                  *
5127                  * XXX Should allow to set or clear pp_flags.
5128                  *
5129                  * Finally, if the respective authentication protocol to
5130                  * be used is set differently than 0, but the secret is
5131                  * passed as all zeros, we don't trash the existing secret.
5132                  * This allows an administrator to change the system name
5133                  * only without clobbering the secret (which he didn't get
5134                  * back in a previous SPPPIOGDEFS call).  However, the
5135                  * secrets are cleared if the authentication protocol is
5136                  * reset to 0.  */
5137                 if (sp->pp_phase != PHASE_DEAD &&
5138                     sp->pp_phase != PHASE_ESTABLISH) {
5139                         rv = EBUSY;
5140                         break;
5141                 }
5142
5143                 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP &&
5144                      spr->defs.myauth.proto != PPP_CHAP) ||
5145                     (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP &&
5146                      spr->defs.hisauth.proto != PPP_CHAP)) {
5147                         rv = EINVAL;
5148                         break;
5149                 }
5150
5151                 if (spr->defs.myauth.proto == 0)
5152                         /* resetting myauth */
5153                         bzero(&sp->myauth, sizeof sp->myauth);
5154                 else {
5155                         /* setting/changing myauth */
5156                         sp->myauth.proto = spr->defs.myauth.proto;
5157                         bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
5158                         if (spr->defs.myauth.secret[0] != '\0')
5159                                 bcopy(spr->defs.myauth.secret, sp->myauth.secret,
5160                                       AUTHKEYLEN);
5161                 }
5162                 if (spr->defs.hisauth.proto == 0)
5163                         /* resetting hisauth */
5164                         bzero(&sp->hisauth, sizeof sp->hisauth);
5165                 else {
5166                         /* setting/changing hisauth */
5167                         sp->hisauth.proto = spr->defs.hisauth.proto;
5168                         sp->hisauth.flags = spr->defs.hisauth.flags;
5169                         bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
5170                         if (spr->defs.hisauth.secret[0] != '\0')
5171                                 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret,
5172                                       AUTHKEYLEN);
5173                 }
5174                 /* set LCP restart timer timeout */
5175                 if (spr->defs.lcp.timeout != 0)
5176                         sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000;
5177                 /* set VJ enable and IPv6 disable flags */
5178 #ifdef INET
5179                 if (spr->defs.enable_vj)
5180                         sp->confflags |= CONF_ENABLE_VJ;
5181                 else
5182                         sp->confflags &= ~CONF_ENABLE_VJ;
5183 #endif
5184 #ifdef INET6
5185                 if (spr->defs.enable_ipv6)
5186                         sp->confflags |= CONF_ENABLE_IPV6;
5187                 else
5188                         sp->confflags &= ~CONF_ENABLE_IPV6;
5189 #endif
5190                 break;
5191
5192         default:
5193                 rv = EINVAL;
5194         }
5195
5196  quit:
5197         free(spr, M_TEMP);
5198
5199         return (rv);
5200 }
5201
5202 static void
5203 sppp_phase_network(struct sppp *sp)
5204 {
5205         STDDCL;
5206         int i;
5207         u_long mask;
5208
5209         sp->pp_phase = PHASE_NETWORK;
5210
5211         if (debug)
5212                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
5213                     sppp_phase_name(sp->pp_phase));
5214
5215         /* Notify NCPs now. */
5216         for (i = 0; i < IDX_COUNT; i++)
5217                 if ((cps[i])->flags & CP_NCP)
5218                         (cps[i])->Open(sp);
5219
5220         /* Send Up events to all NCPs. */
5221         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
5222                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP))
5223                         (cps[i])->Up(sp);
5224
5225         /* if no NCP is starting, all this was in vain, close down */
5226         sppp_lcp_check_and_close(sp);
5227 }
5228
5229
5230 static const char *
5231 sppp_cp_type_name(u_char type)
5232 {
5233         static char buf[12];
5234         switch (type) {
5235         case CONF_REQ:   return "conf-req";
5236         case CONF_ACK:   return "conf-ack";
5237         case CONF_NAK:   return "conf-nak";
5238         case CONF_REJ:   return "conf-rej";
5239         case TERM_REQ:   return "term-req";
5240         case TERM_ACK:   return "term-ack";
5241         case CODE_REJ:   return "code-rej";
5242         case PROTO_REJ:  return "proto-rej";
5243         case ECHO_REQ:   return "echo-req";
5244         case ECHO_REPLY: return "echo-reply";
5245         case DISC_REQ:   return "discard-req";
5246         }
5247         snprintf (buf, sizeof(buf), "cp/0x%x", type);
5248         return buf;
5249 }
5250
5251 static const char *
5252 sppp_auth_type_name(u_short proto, u_char type)
5253 {
5254         static char buf[12];
5255         switch (proto) {
5256         case PPP_CHAP:
5257                 switch (type) {
5258                 case CHAP_CHALLENGE:    return "challenge";
5259                 case CHAP_RESPONSE:     return "response";
5260                 case CHAP_SUCCESS:      return "success";
5261                 case CHAP_FAILURE:      return "failure";
5262                 }
5263         case PPP_PAP:
5264                 switch (type) {
5265                 case PAP_REQ:           return "req";
5266                 case PAP_ACK:           return "ack";
5267                 case PAP_NAK:           return "nak";
5268                 }
5269         }
5270         snprintf (buf, sizeof(buf), "auth/0x%x", type);
5271         return buf;
5272 }
5273
5274 static const char *
5275 sppp_lcp_opt_name(u_char opt)
5276 {
5277         static char buf[12];
5278         switch (opt) {
5279         case LCP_OPT_MRU:               return "mru";
5280         case LCP_OPT_ASYNC_MAP:         return "async-map";
5281         case LCP_OPT_AUTH_PROTO:        return "auth-proto";
5282         case LCP_OPT_QUAL_PROTO:        return "qual-proto";
5283         case LCP_OPT_MAGIC:             return "magic";
5284         case LCP_OPT_PROTO_COMP:        return "proto-comp";
5285         case LCP_OPT_ADDR_COMP:         return "addr-comp";
5286         }
5287         snprintf (buf, sizeof(buf), "lcp/0x%x", opt);
5288         return buf;
5289 }
5290
5291 #ifdef INET
5292 static const char *
5293 sppp_ipcp_opt_name(u_char opt)
5294 {
5295         static char buf[12];
5296         switch (opt) {
5297         case IPCP_OPT_ADDRESSES:        return "addresses";
5298         case IPCP_OPT_COMPRESSION:      return "compression";
5299         case IPCP_OPT_ADDRESS:          return "address";
5300         }
5301         snprintf (buf, sizeof(buf), "ipcp/0x%x", opt);
5302         return buf;
5303 }
5304 #endif
5305
5306 #ifdef INET6
5307 static const char *
5308 sppp_ipv6cp_opt_name(u_char opt)
5309 {
5310         static char buf[12];
5311         switch (opt) {
5312         case IPV6CP_OPT_IFID:           return "ifid";
5313         case IPV6CP_OPT_COMPRESSION:    return "compression";
5314         }
5315         sprintf (buf, "0x%x", opt);
5316         return buf;
5317 }
5318 #endif
5319
5320 static const char *
5321 sppp_state_name(int state)
5322 {
5323         switch (state) {
5324         case STATE_INITIAL:     return "initial";
5325         case STATE_STARTING:    return "starting";
5326         case STATE_CLOSED:      return "closed";
5327         case STATE_STOPPED:     return "stopped";
5328         case STATE_CLOSING:     return "closing";
5329         case STATE_STOPPING:    return "stopping";
5330         case STATE_REQ_SENT:    return "req-sent";
5331         case STATE_ACK_RCVD:    return "ack-rcvd";
5332         case STATE_ACK_SENT:    return "ack-sent";
5333         case STATE_OPENED:      return "opened";
5334         }
5335         return "illegal";
5336 }
5337
5338 static const char *
5339 sppp_phase_name(enum ppp_phase phase)
5340 {
5341         switch (phase) {
5342         case PHASE_DEAD:        return "dead";
5343         case PHASE_ESTABLISH:   return "establish";
5344         case PHASE_TERMINATE:   return "terminate";
5345         case PHASE_AUTHENTICATE: return "authenticate";
5346         case PHASE_NETWORK:     return "network";
5347         }
5348         return "illegal";
5349 }
5350
5351 static const char *
5352 sppp_proto_name(u_short proto)
5353 {
5354         static char buf[12];
5355         switch (proto) {
5356         case PPP_LCP:   return "lcp";
5357         case PPP_IPCP:  return "ipcp";
5358         case PPP_PAP:   return "pap";
5359         case PPP_CHAP:  return "chap";
5360         case PPP_IPV6CP: return "ipv6cp";
5361         }
5362         snprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto);
5363         return buf;
5364 }
5365
5366 static void
5367 sppp_print_bytes(const u_char *p, u_short len)
5368 {
5369         if (len)
5370                 log(-1, " %*D", len, p, "-");
5371 }
5372
5373 static void
5374 sppp_print_string(const char *p, u_short len)
5375 {
5376         u_char c;
5377
5378         while (len-- > 0) {
5379                 c = *p++;
5380                 /*
5381                  * Print only ASCII chars directly.  RFC 1994 recommends
5382                  * using only them, but we don't rely on it.  */
5383                 if (c < ' ' || c > '~')
5384                         log(-1, "\\x%x", c);
5385                 else
5386                         log(-1, "%c", c);
5387         }
5388 }
5389
5390 #ifdef INET
5391 static const char *
5392 sppp_dotted_quad(u_long addr)
5393 {
5394         static char s[16];
5395         sprintf(s, "%d.%d.%d.%d",
5396                 (int)((addr >> 24) & 0xff),
5397                 (int)((addr >> 16) & 0xff),
5398                 (int)((addr >> 8) & 0xff),
5399                 (int)(addr & 0xff));
5400         return s;
5401 }
5402 #endif
5403
5404 static int
5405 sppp_strnlen(u_char *p, int max)
5406 {
5407         int len;
5408
5409         for (len = 0; len < max && *p; ++p)
5410                 ++len;
5411         return len;
5412 }
5413
5414 /* a dummy, used to drop uninteresting events */
5415 static void
5416 sppp_null(struct sppp *unused)
5417 {
5418         /* do just nothing */
5419 }