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 #include "opt_ipx.h"
  29
  30 #include <sys/systm.h>
  31 #include <sys/kernel.h>
  32 #include <sys/module.h>
  33 #include <sys/sockio.h>
  34 #include <sys/socket.h>
  35 #include <sys/syslog.h>
  36 #include <sys/random.h>
  37 #include <sys/malloc.h>
  38 #include <sys/mbuf.h>
  39
  40 #include <sys/md5.h>
  41
  42 #include <net/if.h>
  43 #include <net/netisr.h>
  44 #include <net/if_types.h>
  45 #include <net/route.h>
  46 #include <net/vnet.h>
  47 #include <netinet/in.h>
  48 #include <netinet/in_systm.h>
  49 #include <netinet/ip.h>
  50 #include <net/slcompress.h>
  51
  52 #include <machine/stdarg.h>
  53
  54 #include <netinet/in_var.h>
  55
  56 #ifdef INET
  57 #include <netinet/ip.h>
  58 #include <netinet/tcp.h>
  59 #endif
  60
  61 #ifdef INET6
  62 #include <netinet6/scope6_var.h>
  63 #endif
  64
  65 #include <netinet/if_ether.h>
  66
  67 #ifdef IPX
  68 #include <netipx/ipx.h>
  69 #include <netipx/ipx_if.h>
  70 #endif
  71
  72 #include <net/if_sppp.h>
  73
  74 #define IOCTL_CMD_T     u_long
  75 #define MAXALIVECNT     3               /* max. alive packets */
  76
  77 /*
  78  * Interface flags that can be set in an ifconfig command.
  79  *
  80  * Setting link0 will make the link passive, i.e. it will be marked
  81  * as being administrative openable, but won't be opened to begin
  82  * with.  Incoming calls will be answered, or subsequent calls with
  83  * -link1 will cause the administrative open of the LCP layer.
  84  *
  85  * Setting link1 will cause the link to auto-dial only as packets
  86  * arrive to be sent.
  87  *
  88  * Setting IFF_DEBUG will syslog the option negotiation and state
  89  * transitions at level kern.debug.  Note: all logs consistently look
  90  * like
  91  *
  92  *   <if-name><unit>: <proto-name> <additional info...>
  93  *
  94  * with <if-name><unit> being something like "bppp0", and <proto-name>
  95  * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
  96  */
  97
  98 #define IFF_PASSIVE     IFF_LINK0       /* wait passively for connection */
  99 #define IFF_AUTO        IFF_LINK1       /* auto-dial on output */
 100 #define IFF_CISCO       IFF_LINK2       /* auto-dial on output */
 101
 102 #define PPP_ALLSTATIONS 0xff            /* All-Stations broadcast address */
 103 #define PPP_UI          0x03            /* Unnumbered Information */
 104 #define PPP_IP          0x0021          /* Internet Protocol */
 105 #define PPP_ISO         0x0023          /* ISO OSI Protocol */
 106 #define PPP_XNS         0x0025          /* Xerox NS Protocol */
 107 #define PPP_IPX         0x002b          /* Novell IPX Protocol */
 108 #define PPP_VJ_COMP     0x002d          /* VJ compressed TCP/IP */
 109 #define PPP_VJ_UCOMP    0x002f          /* VJ uncompressed TCP/IP */
 110 #define PPP_IPV6        0x0057          /* Internet Protocol Version 6 */
 111 #define PPP_LCP         0xc021          /* Link Control Protocol */
 112 #define PPP_PAP         0xc023          /* Password Authentication Protocol */
 113 #define PPP_CHAP        0xc223          /* Challenge-Handshake Auth Protocol */
 114 #define PPP_IPCP        0x8021          /* Internet Protocol Control Protocol */
 115 #define PPP_IPV6CP      0x8057          /* IPv6 Control Protocol */
 116
 117 #define CONF_REQ        1               /* PPP configure request */
 118 #define CONF_ACK        2               /* PPP configure acknowledge */
 119 #define CONF_NAK        3               /* PPP configure negative ack */
 120 #define CONF_REJ        4               /* PPP configure reject */
 121 #define TERM_REQ        5               /* PPP terminate request */
 122 #define TERM_ACK        6               /* PPP terminate acknowledge */
 123 #define CODE_REJ        7               /* PPP code reject */
 124 #define PROTO_REJ       8               /* PPP protocol reject */
 125 #define ECHO_REQ        9               /* PPP echo request */
 126 #define ECHO_REPLY      10              /* PPP echo reply */
 127 #define DISC_REQ        11              /* PPP discard request */
 128
 129 #define LCP_OPT_MRU             1       /* maximum receive unit */
 130 #define LCP_OPT_ASYNC_MAP       2       /* async control character map */
 131 #define LCP_OPT_AUTH_PROTO      3       /* authentication protocol */
 132 #define LCP_OPT_QUAL_PROTO      4       /* quality protocol */
 133 #define LCP_OPT_MAGIC           5       /* magic number */
 134 #define LCP_OPT_RESERVED        6       /* reserved */
 135 #define LCP_OPT_PROTO_COMP      7       /* protocol field compression */
 136 #define LCP_OPT_ADDR_COMP       8       /* address/control field compression */
 137
 138 #define IPCP_OPT_ADDRESSES      1       /* both IP addresses; deprecated */
 139 #define IPCP_OPT_COMPRESSION    2       /* IP compression protocol (VJ) */
 140 #define IPCP_OPT_ADDRESS        3       /* local IP address */
 141
 142 #define IPV6CP_OPT_IFID 1       /* interface identifier */
 143 #define IPV6CP_OPT_COMPRESSION  2       /* IPv6 compression protocol */
 144
 145 #define IPCP_COMP_VJ            0x2d    /* Code for VJ compression */
 146
 147 #define PAP_REQ                 1       /* PAP name/password request */
 148 #define PAP_ACK                 2       /* PAP acknowledge */
 149 #define PAP_NAK                 3       /* PAP fail */
 150
 151 #define CHAP_CHALLENGE          1       /* CHAP challenge request */
 152 #define CHAP_RESPONSE           2       /* CHAP challenge response */
 153 #define CHAP_SUCCESS            3       /* CHAP response ok */
 154 #define CHAP_FAILURE            4       /* CHAP response failed */
 155
 156 #define CHAP_MD5                5       /* hash algorithm - MD5 */
 157
 158 #define CISCO_MULTICAST         0x8f    /* Cisco multicast address */
 159 #define CISCO_UNICAST           0x0f    /* Cisco unicast address */
 160 #define CISCO_KEEPALIVE         0x8035  /* Cisco keepalive protocol */
 161 #define CISCO_ADDR_REQ          0       /* Cisco address request */
 162 #define CISCO_ADDR_REPLY        1       /* Cisco address reply */
 163 #define CISCO_KEEPALIVE_REQ     2       /* Cisco keepalive request */
 164
 165 /* states are named and numbered according to RFC 1661 */
 166 #define STATE_INITIAL   0
 167 #define STATE_STARTING  1
 168 #define STATE_CLOSED    2
 169 #define STATE_STOPPED   3
 170 #define STATE_CLOSING   4
 171 #define STATE_STOPPING  5
 172 #define STATE_REQ_SENT  6
 173 #define STATE_ACK_RCVD  7
 174 #define STATE_ACK_SENT  8
 175 #define STATE_OPENED    9
 176
 177 static MALLOC_DEFINE(M_SPPP, "sppp", "synchronous PPP interface internals");
 178
 179 struct ppp_header {
 180         u_char address;
 181         u_char control;
 182         u_short protocol;
 183 } __packed;
 184 #define PPP_HEADER_LEN          sizeof (struct ppp_header)
 185
 186 struct lcp_header {
 187         u_char type;
 188         u_char ident;
 189         u_short len;
 190 } __packed;
 191 #define LCP_HEADER_LEN          sizeof (struct lcp_header)
 192
 193 struct cisco_packet {
 194         u_long type;
 195         u_long par1;
 196         u_long par2;
 197         u_short rel;
 198         u_short time0;
 199         u_short time1;
 200 } __packed;
 201 #define CISCO_PACKET_LEN        sizeof (struct cisco_packet)
 202
 203 /*
 204  * We follow the spelling and capitalization of RFC 1661 here, to make
 205  * it easier comparing with the standard.  Please refer to this RFC in
 206  * case you can't make sense out of these abbreviation; it will also
 207  * explain the semantics related to the various events and actions.
 208  */
 209 struct cp {
 210         u_short proto;          /* PPP control protocol number */
 211         u_char protoidx;        /* index into state table in struct sppp */
 212         u_char flags;
 213 #define CP_LCP          0x01    /* this is the LCP */
 214 #define CP_AUTH         0x02    /* this is an authentication protocol */
 215 #define CP_NCP          0x04    /* this is a NCP */
 216 #define CP_QUAL         0x08    /* this is a quality reporting protocol */
 217         const char *name;       /* name of this control protocol */
 218         /* event handlers */
 219         void    (*Up)(struct sppp *sp);
 220         void    (*Down)(struct sppp *sp);
 221         void    (*Open)(struct sppp *sp);
 222         void    (*Close)(struct sppp *sp);
 223         void    (*TO)(void *sp);
 224         int     (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
 225         void    (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
 226         void    (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
 227         /* actions */
 228         void    (*tlu)(struct sppp *sp);
 229         void    (*tld)(struct sppp *sp);
 230         void    (*tls)(struct sppp *sp);
 231         void    (*tlf)(struct sppp *sp);
 232         void    (*scr)(struct sppp *sp);
 233 };
 234
 235 #define SPP_FMT         "%s: "
 236 #define SPP_ARGS(ifp)   (ifp)->if_xname
 237
 238 #define SPPP_LOCK(sp)   mtx_lock (&(sp)->mtx)
 239 #define SPPP_UNLOCK(sp) mtx_unlock (&(sp)->mtx)
 240 #define SPPP_LOCK_ASSERT(sp)    mtx_assert (&(sp)->mtx, MA_OWNED)
 241 #define SPPP_LOCK_OWNED(sp)     mtx_owned (&(sp)->mtx)
 242
 243 #ifdef INET
 244 /*
 245  * The following disgusting hack gets around the problem that IP TOS
 246  * can't be set yet.  We want to put "interactive" traffic on a high
 247  * priority queue.  To decide if traffic is interactive, we check that
 248  * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
 249  *
 250  * XXX is this really still necessary?  - joerg -
 251  */
 252 static const u_short interactive_ports[8] = {
 253         0,      513,    0,      0,
 254         0,      21,     0,      23,
 255 };
 256 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
 257 #endif
 258
 259 /* almost every function needs these */
 260 #define STDDCL                                                  \
 261         struct ifnet *ifp = SP2IFP(sp);                         \
 262         int debug = ifp->if_flags & IFF_DEBUG
 263
 264 static int sppp_output(struct ifnet *ifp, struct mbuf *m,
 265         const struct sockaddr *dst, struct route *ro);
 266
 267 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
 268 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
 269
 270 static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
 271                           struct mbuf *m);
 272 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
 273                          u_char ident, u_short len, void *data);
 274 /* static void sppp_cp_timeout(void *arg); */
 275 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
 276                                  int newstate);
 277 static void sppp_auth_send(const struct cp *cp,
 278                            struct sppp *sp, unsigned int type, unsigned int id,
 279                            ...);
 280
 281 static void sppp_up_event(const struct cp *cp, struct sppp *sp);
 282 static void sppp_down_event(const struct cp *cp, struct sppp *sp);
 283 static void sppp_open_event(const struct cp *cp, struct sppp *sp);
 284 static void sppp_close_event(const struct cp *cp, struct sppp *sp);
 285 static void sppp_to_event(const struct cp *cp, struct sppp *sp);
 286
 287 static void sppp_null(struct sppp *sp);
 288
 289 static void sppp_pp_up(struct sppp *sp);
 290 static void sppp_pp_down(struct sppp *sp);
 291
 292 static void sppp_lcp_init(struct sppp *sp);
 293 static void sppp_lcp_up(struct sppp *sp);
 294 static void sppp_lcp_down(struct sppp *sp);
 295 static void sppp_lcp_open(struct sppp *sp);
 296 static void sppp_lcp_close(struct sppp *sp);
 297 static void sppp_lcp_TO(void *sp);
 298 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 299 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 300 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 301 static void sppp_lcp_tlu(struct sppp *sp);
 302 static void sppp_lcp_tld(struct sppp *sp);
 303 static void sppp_lcp_tls(struct sppp *sp);
 304 static void sppp_lcp_tlf(struct sppp *sp);
 305 static void sppp_lcp_scr(struct sppp *sp);
 306 static void sppp_lcp_check_and_close(struct sppp *sp);
 307 static int sppp_ncp_check(struct sppp *sp);
 308
 309 static void sppp_ipcp_init(struct sppp *sp);
 310 static void sppp_ipcp_up(struct sppp *sp);
 311 static void sppp_ipcp_down(struct sppp *sp);
 312 static void sppp_ipcp_open(struct sppp *sp);
 313 static void sppp_ipcp_close(struct sppp *sp);
 314 static void sppp_ipcp_TO(void *sp);
 315 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 316 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 317 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 318 static void sppp_ipcp_tlu(struct sppp *sp);
 319 static void sppp_ipcp_tld(struct sppp *sp);
 320 static void sppp_ipcp_tls(struct sppp *sp);
 321 static void sppp_ipcp_tlf(struct sppp *sp);
 322 static void sppp_ipcp_scr(struct sppp *sp);
 323
 324 static void sppp_ipv6cp_init(struct sppp *sp);
 325 static void sppp_ipv6cp_up(struct sppp *sp);
 326 static void sppp_ipv6cp_down(struct sppp *sp);
 327 static void sppp_ipv6cp_open(struct sppp *sp);
 328 static void sppp_ipv6cp_close(struct sppp *sp);
 329 static void sppp_ipv6cp_TO(void *sp);
 330 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len);
 331 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
 332 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
 333 static void sppp_ipv6cp_tlu(struct sppp *sp);
 334 static void sppp_ipv6cp_tld(struct sppp *sp);
 335 static void sppp_ipv6cp_tls(struct sppp *sp);
 336 static void sppp_ipv6cp_tlf(struct sppp *sp);
 337 static void sppp_ipv6cp_scr(struct sppp *sp);
 338
 339 static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
 340 static void sppp_pap_init(struct sppp *sp);
 341 static void sppp_pap_open(struct sppp *sp);
 342 static void sppp_pap_close(struct sppp *sp);
 343 static void sppp_pap_TO(void *sp);
 344 static void sppp_pap_my_TO(void *sp);
 345 static void sppp_pap_tlu(struct sppp *sp);
 346 static void sppp_pap_tld(struct sppp *sp);
 347 static void sppp_pap_scr(struct sppp *sp);
 348
 349 static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
 350 static void sppp_chap_init(struct sppp *sp);
 351 static void sppp_chap_open(struct sppp *sp);
 352 static void sppp_chap_close(struct sppp *sp);
 353 static void sppp_chap_TO(void *sp);
 354 static void sppp_chap_tlu(struct sppp *sp);
 355 static void sppp_chap_tld(struct sppp *sp);
 356 static void sppp_chap_scr(struct sppp *sp);
 357
 358 static const char *sppp_auth_type_name(u_short proto, u_char type);
 359 static const char *sppp_cp_type_name(u_char type);
 360 #ifdef INET
 361 static const char *sppp_dotted_quad(u_long addr);
 362 static const char *sppp_ipcp_opt_name(u_char opt);
 363 #endif
 364 #ifdef INET6
 365 static const char *sppp_ipv6cp_opt_name(u_char opt);
 366 #endif
 367 static const char *sppp_lcp_opt_name(u_char opt);
 368 static const char *sppp_phase_name(enum ppp_phase phase);
 369 static const char *sppp_proto_name(u_short proto);
 370 static const char *sppp_state_name(int state);
 371 static int sppp_params(struct sppp *sp, u_long cmd, void *data);
 372 static int sppp_strnlen(u_char *p, int max);
 373 static void sppp_keepalive(void *dummy);
 374 static void sppp_phase_network(struct sppp *sp);
 375 static void sppp_print_bytes(const u_char *p, u_short len);
 376 static void sppp_print_string(const char *p, u_short len);
 377 static void sppp_qflush(struct ifqueue *ifq);
 378 #ifdef INET
 379 static void sppp_set_ip_addr(struct sppp *sp, u_long src);
 380 #endif
 381 #ifdef INET6
 382 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src,
 383                                struct in6_addr *dst, struct in6_addr *srcmask);
 384 #ifdef IPV6CP_MYIFID_DYN
 385 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src);
 386 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src);
 387 #endif
 388 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src);
 389 #endif
 390
 391 /* if_start () wrapper */
 392 static void sppp_ifstart (struct ifnet *ifp);
 393
 394 /* our control protocol descriptors */
 395 static const struct cp lcp = {
 396         PPP_LCP, IDX_LCP, CP_LCP, "lcp",
 397         sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
 398         sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
 399         sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
 400         sppp_lcp_scr
 401 };
 402
 403 static const struct cp ipcp = {
 404         PPP_IPCP, IDX_IPCP,
 405 #ifdef INET     /* don't run IPCP if there's no IPv4 support */
 406         CP_NCP,
 407 #else
 408         0,
 409 #endif
 410         "ipcp",
 411         sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
 412         sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
 413         sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
 414         sppp_ipcp_scr
 415 };
 416
 417 static const struct cp ipv6cp = {
 418         PPP_IPV6CP, IDX_IPV6CP,
 419 #ifdef INET6    /*don't run IPv6CP if there's no IPv6 support*/
 420         CP_NCP,
 421 #else
 422         0,
 423 #endif
 424         "ipv6cp",
 425         sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close,
 426         sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak,
 427         sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf,
 428         sppp_ipv6cp_scr
 429 };
 430
 431 static const struct cp pap = {
 432         PPP_PAP, IDX_PAP, CP_AUTH, "pap",
 433         sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
 434         sppp_pap_TO, 0, 0, 0,
 435         sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
 436         sppp_pap_scr
 437 };
 438
 439 static const struct cp chap = {
 440         PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
 441         sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
 442         sppp_chap_TO, 0, 0, 0,
 443         sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
 444         sppp_chap_scr
 445 };
 446
 447 static const struct cp *cps[IDX_COUNT] = {
 448         &lcp,                   /* IDX_LCP */
 449         &ipcp,                  /* IDX_IPCP */
 450         &ipv6cp,                /* IDX_IPV6CP */
 451         &pap,                   /* IDX_PAP */
 452         &chap,                  /* IDX_CHAP */
 453 };
 454
 455 static void*
 456 sppp_alloc(u_char type, struct ifnet *ifp)
 457 {
 458         struct sppp     *sp;
 459
 460         sp = malloc(sizeof(struct sppp), M_SPPP, M_WAITOK | M_ZERO);
 461         sp->pp_ifp = ifp;
 462
 463         return (sp);
 464 }
 465
 466 static void
 467 sppp_free(void *com, u_char type)
 468 {
 469
 470         free(com, M_SPPP);
 471 }
 472
 473 static int
 474 sppp_modevent(module_t mod, int type, void *unused)
 475 {
 476         switch (type) {
 477         case MOD_LOAD:
 478                 /*
 479                  * XXX: should probably be IFT_SPPP, but it's fairly
 480                  * harmless to allocate struct sppp's for non-sppp
 481                  * interfaces.
 482                  */
 483
 484                 if_register_com_alloc(IFT_PPP, sppp_alloc, sppp_free);
 485                 break;
 486         case MOD_UNLOAD:
 487                 /* if_deregister_com_alloc(IFT_PPP); */
 488                 return EACCES;
 489         default:
 490                 return EOPNOTSUPP;
 491         }
 492         return 0;
 493 }
 494 static moduledata_t spppmod = {
 495         "sppp",
 496         sppp_modevent,
 497         0
 498 };
 499 MODULE_VERSION(sppp, 1);
 500 DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY);
 501
 502 /*
 503  * Exported functions, comprising our interface to the lower layer.
 504  */
 505
 506 /*
 507  * Process the received packet.
 508  */
 509 void
 510 sppp_input(struct ifnet *ifp, struct mbuf *m)
 511 {
 512         struct ppp_header *h;
 513         int isr = -1;
 514         struct sppp *sp = IFP2SP(ifp);
 515         int debug, do_account = 0;
 516 #ifdef INET
 517         int hlen, vjlen;
 518         u_char *iphdr;
 519 #endif
 520
 521         SPPP_LOCK(sp);
 522         debug = ifp->if_flags & IFF_DEBUG;
 523
 524         if (ifp->if_flags & IFF_UP)
 525                 /* Count received bytes, add FCS and one flag */
 526                 ifp->if_ibytes += m->m_pkthdr.len + 3;
 527
 528         if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
 529                 /* Too small packet, drop it. */
 530                 if (debug)
 531                         log(LOG_DEBUG,
 532                             SPP_FMT "input packet is too small, %d bytes\n",
 533                             SPP_ARGS(ifp), m->m_pkthdr.len);
 534           drop:
 535                 m_freem (m);
 536                 SPPP_UNLOCK(sp);
 537           drop2:
 538                 ++ifp->if_ierrors;
 539                 ++ifp->if_iqdrops;
 540                 return;
 541         }
 542
 543         if (sp->pp_mode == PP_FR) {
 544                 sppp_fr_input (sp, m);
 545                 SPPP_UNLOCK(sp);
 546                 return;
 547         }
 548
 549         /* Get PPP header. */
 550         h = mtod (m, struct ppp_header*);
 551         m_adj (m, PPP_HEADER_LEN);
 552
 553         switch (h->address) {
 554         case PPP_ALLSTATIONS:
 555                 if (h->control != PPP_UI)
 556                         goto invalid;
 557                 if (sp->pp_mode == IFF_CISCO) {
 558                         if (debug)
 559                                 log(LOG_DEBUG,
 560                                     SPP_FMT "PPP packet in Cisco mode "
 561                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 562                                     SPP_ARGS(ifp),
 563                                     h->address, h->control, ntohs(h->protocol));
 564                         goto drop;
 565                 }
 566                 switch (ntohs (h->protocol)) {
 567                 default:
 568                         if (debug)
 569                                 log(LOG_DEBUG,
 570                                     SPP_FMT "rejecting protocol "
 571                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 572                                     SPP_ARGS(ifp),
 573                                     h->address, h->control, ntohs(h->protocol));
 574                         if (sp->state[IDX_LCP] == STATE_OPENED)
 575                                 sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
 576                                         ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2,
 577                                         &h->protocol);
 578                         ++ifp->if_noproto;
 579                         goto drop;
 580                 case PPP_LCP:
 581                         sppp_cp_input(&lcp, sp, m);
 582                         m_freem (m);
 583                         SPPP_UNLOCK(sp);
 584                         return;
 585                 case PPP_PAP:
 586                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
 587                                 sppp_pap_input(sp, m);
 588                         m_freem (m);
 589                         SPPP_UNLOCK(sp);
 590                         return;
 591                 case PPP_CHAP:
 592                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
 593                                 sppp_chap_input(sp, m);
 594                         m_freem (m);
 595                         SPPP_UNLOCK(sp);
 596                         return;
 597 #ifdef INET
 598                 case PPP_IPCP:
 599                         if (sp->pp_phase == PHASE_NETWORK)
 600                                 sppp_cp_input(&ipcp, sp, m);
 601                         m_freem (m);
 602                         SPPP_UNLOCK(sp);
 603                         return;
 604                 case PPP_IP:
 605                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 606                                 isr = NETISR_IP;
 607                         }
 608                         do_account++;
 609                         break;
 610                 case PPP_VJ_COMP:
 611                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 612                                 if ((vjlen =
 613                                      sl_uncompress_tcp_core(mtod(m, u_char *),
 614                                                             m->m_len, m->m_len,
 615                                                             TYPE_COMPRESSED_TCP,
 616                                                             sp->pp_comp,
 617                                                             &iphdr, &hlen)) <= 0) {
 618                                         if (debug)
 619                                                 log(LOG_INFO,
 620                             SPP_FMT "VJ uncompress failed on compressed packet\n",
 621                                                     SPP_ARGS(ifp));
 622                                         goto drop;
 623                                 }
 624
 625                                 /*
 626                                  * Trim the VJ header off the packet, and prepend
 627                                  * the uncompressed IP header (which will usually
 628                                  * end up in two chained mbufs since there's not
 629                                  * enough leading space in the existing mbuf).
 630                                  */
 631                                 m_adj(m, vjlen);
 632                                 M_PREPEND(m, hlen, M_NOWAIT);
 633                                 if (m == NULL) {
 634                                         SPPP_UNLOCK(sp);
 635                                         goto drop2;
 636                                 }
 637                                 bcopy(iphdr, mtod(m, u_char *), hlen);
 638                                 isr = NETISR_IP;
 639                         }
 640                         do_account++;
 641                         break;
 642                 case PPP_VJ_UCOMP:
 643                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
 644                                 if (sl_uncompress_tcp_core(mtod(m, u_char *),
 645                                                            m->m_len, m->m_len,
 646                                                            TYPE_UNCOMPRESSED_TCP,
 647                                                            sp->pp_comp,
 648                                                            &iphdr, &hlen) != 0) {
 649                                         if (debug)
 650                                                 log(LOG_INFO,
 651                             SPP_FMT "VJ uncompress failed on uncompressed packet\n",
 652                                                     SPP_ARGS(ifp));
 653                                         goto drop;
 654                                 }
 655                                 isr = NETISR_IP;
 656                         }
 657                         do_account++;
 658                         break;
 659 #endif
 660 #ifdef INET6
 661                 case PPP_IPV6CP:
 662                         if (sp->pp_phase == PHASE_NETWORK)
 663                             sppp_cp_input(&ipv6cp, sp, m);
 664                         m_freem (m);
 665                         SPPP_UNLOCK(sp);
 666                         return;
 667
 668                 case PPP_IPV6:
 669                         if (sp->state[IDX_IPV6CP] == STATE_OPENED)
 670                                 isr = NETISR_IPV6;
 671                         do_account++;
 672                         break;
 673 #endif
 674 #ifdef IPX
 675                 case PPP_IPX:
 676                         /* IPX IPXCP not implemented yet */
 677                         if (sp->pp_phase == PHASE_NETWORK)
 678                                 isr = NETISR_IPX;
 679                         do_account++;
 680                         break;
 681 #endif
 682                 }
 683                 break;
 684         case CISCO_MULTICAST:
 685         case CISCO_UNICAST:
 686                 /* Don't check the control field here (RFC 1547). */
 687                 if (sp->pp_mode != IFF_CISCO) {
 688                         if (debug)
 689                                 log(LOG_DEBUG,
 690                                     SPP_FMT "Cisco packet in PPP mode "
 691                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 692                                     SPP_ARGS(ifp),
 693                                     h->address, h->control, ntohs(h->protocol));
 694                         goto drop;
 695                 }
 696                 switch (ntohs (h->protocol)) {
 697                 default:
 698                         ++ifp->if_noproto;
 699                         goto invalid;
 700                 case CISCO_KEEPALIVE:
 701                         sppp_cisco_input (sp, m);
 702                         m_freem (m);
 703                         SPPP_UNLOCK(sp);
 704                         return;
 705 #ifdef INET
 706                 case ETHERTYPE_IP:
 707                         isr = NETISR_IP;
 708                         do_account++;
 709                         break;
 710 #endif
 711 #ifdef INET6
 712                 case ETHERTYPE_IPV6:
 713                         isr = NETISR_IPV6;
 714                         do_account++;
 715                         break;
 716 #endif
 717 #ifdef IPX
 718                 case ETHERTYPE_IPX:
 719                         isr = NETISR_IPX;
 720                         do_account++;
 721                         break;
 722 #endif
 723                 }
 724                 break;
 725         default:        /* Invalid PPP packet. */
 726           invalid:
 727                 if (debug)
 728                         log(LOG_DEBUG,
 729                             SPP_FMT "invalid input packet "
 730                             "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
 731                             SPP_ARGS(ifp),
 732                             h->address, h->control, ntohs(h->protocol));
 733                 goto drop;
 734         }
 735
 736         if (! (ifp->if_flags & IFF_UP) || isr == -1)
 737                 goto drop;
 738
 739         SPPP_UNLOCK(sp);
 740         M_SETFIB(m, ifp->if_fib);
 741         /* Check queue. */
 742         if (netisr_queue(isr, m)) {     /* (0) on success. */
 743                 if (debug)
 744                         log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n",
 745                                 SPP_ARGS(ifp));
 746                 goto drop2;
 747         }
 748
 749         if (do_account)
 750                 /*
 751                  * Do only account for network packets, not for control
 752                  * packets.  This is used by some subsystems to detect
 753                  * idle lines.
 754                  */
 755                 sp->pp_last_recv = time_uptime;
 756 }
 757
 758 static void
 759 sppp_ifstart_sched(void *dummy)
 760 {
 761         struct sppp *sp = dummy;
 762
 763         sp->if_start(SP2IFP(sp));
 764 }
 765
 766 /* if_start () wrapper function. We use it to schedule real if_start () for
 767  * execution. We can't call it directly
 768  */
 769 static void
 770 sppp_ifstart(struct ifnet *ifp)
 771 {
 772         struct sppp *sp = IFP2SP(ifp);
 773
 774         if (SPPP_LOCK_OWNED(sp)) {
 775                 if (callout_pending(&sp->ifstart_callout))
 776                         return;
 777                 callout_reset(&sp->ifstart_callout, 1, sppp_ifstart_sched,
 778                     (void *)sp);
 779         } else {
 780                 sp->if_start(ifp);
 781         }
 782 }
 783
 784 /*
 785  * Enqueue transmit packet.
 786  */
 787 static int
 788 sppp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
 789         struct route *ro)
 790 {
 791         struct sppp *sp = IFP2SP(ifp);
 792         struct ppp_header *h;
 793         struct ifqueue *ifq = NULL;
 794         int error, rv = 0;
 795 #ifdef INET
 796         int ipproto = PPP_IP;
 797 #endif
 798         int debug = ifp->if_flags & IFF_DEBUG;
 799
 800         SPPP_LOCK(sp);
 801
 802         if (!(ifp->if_flags & IFF_UP) ||
 803             (!(ifp->if_flags & IFF_AUTO) &&
 804             !(ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 805 #ifdef INET6
 806           drop:
 807 #endif
 808                 m_freem (m);
 809                 SPPP_UNLOCK(sp);
 810                 return (ENETDOWN);
 811         }
 812
 813         if ((ifp->if_flags & IFF_AUTO) &&
 814             !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 815 #ifdef INET6
 816                 /*
 817                  * XXX
 818                  *
 819                  * Hack to prevent the initialization-time generated
 820                  * IPv6 multicast packet to erroneously cause a
 821                  * dialout event in case IPv6 has been
 822                  * administratively disabled on that interface.
 823                  */
 824                 if (dst->sa_family == AF_INET6 &&
 825                     !(sp->confflags & CONF_ENABLE_IPV6))
 826                         goto drop;
 827 #endif
 828                 /*
 829                  * Interface is not yet running, but auto-dial.  Need
 830                  * to start LCP for it.
 831                  */
 832                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 833                 lcp.Open(sp);
 834         }
 835
 836 #ifdef INET
 837         if (dst->sa_family == AF_INET) {
 838                 /* XXX Check mbuf length here? */
 839                 struct ip *ip = mtod (m, struct ip*);
 840                 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
 841
 842                 /*
 843                  * When using dynamic local IP address assignment by using
 844                  * 0.0.0.0 as a local address, the first TCP session will
 845                  * not connect because the local TCP checksum is computed
 846                  * using 0.0.0.0 which will later become our real IP address
 847                  * so the TCP checksum computed at the remote end will
 848                  * become invalid. So we
 849                  * - don't let packets with src ip addr 0 thru
 850                  * - we flag TCP packets with src ip 0 as an error
 851                  */
 852
 853                 if(ip->ip_src.s_addr == INADDR_ANY)     /* -hm */
 854                 {
 855                         m_freem(m);
 856                         SPPP_UNLOCK(sp);
 857                         if(ip->ip_p == IPPROTO_TCP)
 858                                 return(EADDRNOTAVAIL);
 859                         else
 860                                 return(0);
 861                 }
 862
 863                 /*
 864                  * Put low delay, telnet, rlogin and ftp control packets
 865                  * in front of the queue or let ALTQ take care.
 866                  */
 867                 if (ALTQ_IS_ENABLED(&ifp->if_snd))
 868                         ;
 869                 else if (_IF_QFULL(&sp->pp_fastq))
 870                         ;
 871                 else if (ip->ip_tos & IPTOS_LOWDELAY)
 872                         ifq = &sp->pp_fastq;
 873                 else if (m->m_len < sizeof *ip + sizeof *tcp)
 874                         ;
 875                 else if (ip->ip_p != IPPROTO_TCP)
 876                         ;
 877                 else if (INTERACTIVE (ntohs (tcp->th_sport)))
 878                         ifq = &sp->pp_fastq;
 879                 else if (INTERACTIVE (ntohs (tcp->th_dport)))
 880                         ifq = &sp->pp_fastq;
 881
 882                 /*
 883                  * Do IP Header compression
 884                  */
 885                 if (sp->pp_mode != IFF_CISCO && sp->pp_mode != PP_FR &&
 886                     (sp->ipcp.flags & IPCP_VJ) && ip->ip_p == IPPROTO_TCP)
 887                         switch (sl_compress_tcp(m, ip, sp->pp_comp,
 888                                                 sp->ipcp.compress_cid)) {
 889                         case TYPE_COMPRESSED_TCP:
 890                                 ipproto = PPP_VJ_COMP;
 891                                 break;
 892                         case TYPE_UNCOMPRESSED_TCP:
 893                                 ipproto = PPP_VJ_UCOMP;
 894                                 break;
 895                         case TYPE_IP:
 896                                 ipproto = PPP_IP;
 897                                 break;
 898                         default:
 899                                 m_freem(m);
 900                                 SPPP_UNLOCK(sp);
 901                                 return (EINVAL);
 902                         }
 903         }
 904 #endif
 905
 906 #ifdef INET6
 907         if (dst->sa_family == AF_INET6) {
 908                 /* XXX do something tricky here? */
 909         }
 910 #endif
 911
 912         if (sp->pp_mode == PP_FR) {
 913                 /* Add frame relay header. */
 914                 m = sppp_fr_header (sp, m, dst->sa_family);
 915                 if (! m)
 916                         goto nobufs;
 917                 goto out;
 918         }
 919
 920         /*
 921          * Prepend general data packet PPP header. For now, IP only.
 922          */
 923         M_PREPEND (m, PPP_HEADER_LEN, M_NOWAIT);
 924         if (! m) {
 925 nobufs:         if (debug)
 926                         log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
 927                                 SPP_ARGS(ifp));
 928                 ++ifp->if_oerrors;
 929                 SPPP_UNLOCK(sp);
 930                 return (ENOBUFS);
 931         }
 932         /*
 933          * May want to check size of packet
 934          * (albeit due to the implementation it's always enough)
 935          */
 936         h = mtod (m, struct ppp_header*);
 937         if (sp->pp_mode == IFF_CISCO) {
 938                 h->address = CISCO_UNICAST;        /* unicast address */
 939                 h->control = 0;
 940         } else {
 941                 h->address = PPP_ALLSTATIONS;        /* broadcast address */
 942                 h->control = PPP_UI;                 /* Unnumbered Info */
 943         }
 944
 945         switch (dst->sa_family) {
 946 #ifdef INET
 947         case AF_INET:   /* Internet Protocol */
 948                 if (sp->pp_mode == IFF_CISCO)
 949                         h->protocol = htons (ETHERTYPE_IP);
 950                 else {
 951                         /*
 952                          * Don't choke with an ENETDOWN early.  It's
 953                          * possible that we just started dialing out,
 954                          * so don't drop the packet immediately.  If
 955                          * we notice that we run out of buffer space
 956                          * below, we will however remember that we are
 957                          * not ready to carry IP packets, and return
 958                          * ENETDOWN, as opposed to ENOBUFS.
 959                          */
 960                         h->protocol = htons(ipproto);
 961                         if (sp->state[IDX_IPCP] != STATE_OPENED)
 962                                 rv = ENETDOWN;
 963                 }
 964                 break;
 965 #endif
 966 #ifdef INET6
 967         case AF_INET6:   /* Internet Protocol */
 968                 if (sp->pp_mode == IFF_CISCO)
 969                         h->protocol = htons (ETHERTYPE_IPV6);
 970                 else {
 971                         /*
 972                          * Don't choke with an ENETDOWN early.  It's
 973                          * possible that we just started dialing out,
 974                          * so don't drop the packet immediately.  If
 975                          * we notice that we run out of buffer space
 976                          * below, we will however remember that we are
 977                          * not ready to carry IP packets, and return
 978                          * ENETDOWN, as opposed to ENOBUFS.
 979                          */
 980                         h->protocol = htons(PPP_IPV6);
 981                         if (sp->state[IDX_IPV6CP] != STATE_OPENED)
 982                                 rv = ENETDOWN;
 983                 }
 984                 break;
 985 #endif
 986 #ifdef IPX
 987         case AF_IPX:     /* Novell IPX Protocol */
 988                 h->protocol = htons (sp->pp_mode == IFF_CISCO ?
 989                         ETHERTYPE_IPX : PPP_IPX);
 990                 break;
 991 #endif
 992         default:
 993                 m_freem (m);
 994                 ++ifp->if_oerrors;
 995                 SPPP_UNLOCK(sp);
 996                 return (EAFNOSUPPORT);
 997         }
 998
 999         /*
1000          * Queue message on interface, and start output if interface
1001          * not yet active.
1002          */
1003 out:
1004         if (ifq != NULL)
1005                 error = !(IF_HANDOFF_ADJ(ifq, m, ifp, 3));
1006         else
1007                 IFQ_HANDOFF_ADJ(ifp, m, 3, error);
1008         if (error) {
1009                 ++ifp->if_oerrors;
1010                 SPPP_UNLOCK(sp);
1011                 return (rv? rv: ENOBUFS);
1012         }
1013         SPPP_UNLOCK(sp);
1014         /*
1015          * Unlike in sppp_input(), we can always bump the timestamp
1016          * here since sppp_output() is only called on behalf of
1017          * network-layer traffic; control-layer traffic is handled
1018          * by sppp_cp_send().
1019          */
1020         sp->pp_last_sent = time_uptime;
1021         return (0);
1022 }
1023
1024 void
1025 sppp_attach(struct ifnet *ifp)
1026 {
1027         struct sppp *sp = IFP2SP(ifp);
1028
1029         /* Initialize mtx lock */
1030         mtx_init(&sp->mtx, "sppp", MTX_NETWORK_LOCK, MTX_DEF | MTX_RECURSE);
1031
1032         /* Initialize keepalive handler. */
1033         callout_init(&sp->keepalive_callout, CALLOUT_MPSAFE);
1034         callout_reset(&sp->keepalive_callout, hz * 10, sppp_keepalive,
1035                     (void *)sp);
1036
1037         ifp->if_mtu = PP_MTU;
1038         ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
1039         ifp->if_output = sppp_output;
1040 #if 0
1041         sp->pp_flags = PP_KEEPALIVE;
1042 #endif
1043         ifp->if_snd.ifq_maxlen = 32;
1044         sp->pp_fastq.ifq_maxlen = 32;
1045         sp->pp_cpq.ifq_maxlen = 20;
1046         sp->pp_loopcnt = 0;
1047         sp->pp_alivecnt = 0;
1048         bzero(&sp->pp_seq[0], sizeof(sp->pp_seq));
1049         bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq));
1050         sp->pp_phase = PHASE_DEAD;
1051         sp->pp_up = sppp_pp_up;
1052         sp->pp_down = sppp_pp_down;
1053         if(!mtx_initialized(&sp->pp_cpq.ifq_mtx))
1054                 mtx_init(&sp->pp_cpq.ifq_mtx, "sppp_cpq", NULL, MTX_DEF);
1055         if(!mtx_initialized(&sp->pp_fastq.ifq_mtx))
1056                 mtx_init(&sp->pp_fastq.ifq_mtx, "sppp_fastq", NULL, MTX_DEF);
1057         sp->pp_last_recv = sp->pp_last_sent = time_uptime;
1058         sp->confflags = 0;
1059 #ifdef INET
1060         sp->confflags |= CONF_ENABLE_VJ;
1061 #endif
1062 #ifdef INET6
1063         sp->confflags |= CONF_ENABLE_IPV6;
1064 #endif
1065         callout_init(&sp->ifstart_callout, CALLOUT_MPSAFE);
1066         sp->if_start = ifp->if_start;
1067         ifp->if_start = sppp_ifstart;
1068         sp->pp_comp = malloc(sizeof(struct slcompress), M_TEMP, M_WAITOK);
1069         sl_compress_init(sp->pp_comp, -1);
1070         sppp_lcp_init(sp);
1071         sppp_ipcp_init(sp);
1072         sppp_ipv6cp_init(sp);
1073         sppp_pap_init(sp);
1074         sppp_chap_init(sp);
1075 }
1076
1077 void
1078 sppp_detach(struct ifnet *ifp)
1079 {
1080         struct sppp *sp = IFP2SP(ifp);
1081         int i;
1082
1083         KASSERT(mtx_initialized(&sp->mtx), ("sppp mutex is not initialized"));
1084
1085         /* Stop keepalive handler. */
1086         if (!callout_drain(&sp->keepalive_callout))
1087                 callout_stop(&sp->keepalive_callout);
1088
1089         for (i = 0; i < IDX_COUNT; i++) {
1090                 if (!callout_drain(&sp->ch[i]))
1091                         callout_stop(&sp->ch[i]);
1092         }
1093         if (!callout_drain(&sp->pap_my_to_ch))
1094                 callout_stop(&sp->pap_my_to_ch);
1095         mtx_destroy(&sp->pp_cpq.ifq_mtx);
1096         mtx_destroy(&sp->pp_fastq.ifq_mtx);
1097         mtx_destroy(&sp->mtx);
1098 }
1099
1100 /*
1101  * Flush the interface output queue.
1102  */
1103 static void
1104 sppp_flush_unlocked(struct ifnet *ifp)
1105 {
1106         struct sppp *sp = IFP2SP(ifp);
1107
1108         sppp_qflush ((struct ifqueue *)&SP2IFP(sp)->if_snd);
1109         sppp_qflush (&sp->pp_fastq);
1110         sppp_qflush (&sp->pp_cpq);
1111 }
1112
1113 void
1114 sppp_flush(struct ifnet *ifp)
1115 {
1116         struct sppp *sp = IFP2SP(ifp);
1117
1118         SPPP_LOCK(sp);
1119         sppp_flush_unlocked (ifp);
1120         SPPP_UNLOCK(sp);
1121 }
1122
1123 /*
1124  * Check if the output queue is empty.
1125  */
1126 int
1127 sppp_isempty(struct ifnet *ifp)
1128 {
1129         struct sppp *sp = IFP2SP(ifp);
1130         int empty;
1131
1132         SPPP_LOCK(sp);
1133         empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head &&
1134                 !SP2IFP(sp)->if_snd.ifq_head;
1135         SPPP_UNLOCK(sp);
1136         return (empty);
1137 }
1138
1139 /*
1140  * Get next packet to send.
1141  */
1142 struct mbuf *
1143 sppp_dequeue(struct ifnet *ifp)
1144 {
1145         struct sppp *sp = IFP2SP(ifp);
1146         struct mbuf *m;
1147
1148         SPPP_LOCK(sp);
1149         /*
1150          * Process only the control protocol queue until we have at
1151          * least one NCP open.
1152          *
1153          * Do always serve all three queues in Cisco mode.
1154          */
1155         IF_DEQUEUE(&sp->pp_cpq, m);
1156         if (m == NULL &&
1157             (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO ||
1158              sp->pp_mode == PP_FR)) {
1159                 IF_DEQUEUE(&sp->pp_fastq, m);
1160                 if (m == NULL)
1161                         IF_DEQUEUE (&SP2IFP(sp)->if_snd, m);
1162         }
1163         SPPP_UNLOCK(sp);
1164         return m;
1165 }
1166
1167 /*
1168  * Pick the next packet, do not remove it from the queue.
1169  */
1170 struct mbuf *
1171 sppp_pick(struct ifnet *ifp)
1172 {
1173         struct sppp *sp = IFP2SP(ifp);
1174         struct mbuf *m;
1175
1176         SPPP_LOCK(sp);
1177
1178         m = sp->pp_cpq.ifq_head;
1179         if (m == NULL &&
1180             (sp->pp_phase == PHASE_NETWORK ||
1181              sp->pp_mode == IFF_CISCO ||
1182              sp->pp_mode == PP_FR))
1183                 if ((m = sp->pp_fastq.ifq_head) == NULL)
1184                         m = SP2IFP(sp)->if_snd.ifq_head;
1185         SPPP_UNLOCK(sp);
1186         return (m);
1187 }
1188
1189 /*
1190  * Process an ioctl request.  Called on low priority level.
1191  */
1192 int
1193 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
1194 {
1195         struct ifreq *ifr = (struct ifreq*) data;
1196         struct sppp *sp = IFP2SP(ifp);
1197         int rv, going_up, going_down, newmode;
1198
1199         SPPP_LOCK(sp);
1200         rv = 0;
1201         switch (cmd) {
1202         case SIOCAIFADDR:
1203                 break;
1204
1205         case SIOCSIFADDR:
1206                 /* set the interface "up" when assigning an IP address */
1207                 ifp->if_flags |= IFF_UP;
1208                 /* FALLTHROUGH */
1209
1210         case SIOCSIFFLAGS:
1211                 going_up = ifp->if_flags & IFF_UP &&
1212                         (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0;
1213                 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1214                         ifp->if_drv_flags & IFF_DRV_RUNNING;
1215
1216                 newmode = ifp->if_flags & IFF_PASSIVE;
1217                 if (!newmode)
1218                         newmode = ifp->if_flags & IFF_AUTO;
1219                 if (!newmode)
1220                         newmode = ifp->if_flags & IFF_CISCO;
1221                 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
1222                 ifp->if_flags |= newmode;
1223
1224                 if (!newmode)
1225                         newmode = sp->pp_flags & PP_FR;
1226
1227                 if (newmode != sp->pp_mode) {
1228                         going_down = 1;
1229                         if (!going_up)
1230                                 going_up = ifp->if_drv_flags & IFF_DRV_RUNNING;
1231                 }
1232
1233                 if (going_down) {
1234                         if (sp->pp_mode != IFF_CISCO &&
1235                             sp->pp_mode != PP_FR)
1236                                 lcp.Close(sp);
1237                         else if (sp->pp_tlf)
1238                                 (sp->pp_tlf)(sp);
1239                         sppp_flush_unlocked(ifp);
1240                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1241                         sp->pp_mode = newmode;
1242                 }
1243
1244                 if (going_up) {
1245                         if (sp->pp_mode != IFF_CISCO &&
1246                             sp->pp_mode != PP_FR)
1247                                 lcp.Close(sp);
1248                         sp->pp_mode = newmode;
1249                         if (sp->pp_mode == 0) {
1250                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1251                                 lcp.Open(sp);
1252                         }
1253                         if ((sp->pp_mode == IFF_CISCO) ||
1254                             (sp->pp_mode == PP_FR)) {
1255                                 if (sp->pp_tls)
1256                                         (sp->pp_tls)(sp);
1257                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1258                         }
1259                 }
1260
1261                 break;
1262
1263 #ifdef SIOCSIFMTU
1264 #ifndef ifr_mtu
1265 #define ifr_mtu ifr_metric
1266 #endif
1267         case SIOCSIFMTU:
1268                 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
1269                         return (EINVAL);
1270                 ifp->if_mtu = ifr->ifr_mtu;
1271                 break;
1272 #endif
1273 #ifdef SLIOCSETMTU
1274         case SLIOCSETMTU:
1275                 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
1276                         return (EINVAL);
1277                 ifp->if_mtu = *(short*)data;
1278                 break;
1279 #endif
1280 #ifdef SIOCGIFMTU
1281         case SIOCGIFMTU:
1282                 ifr->ifr_mtu = ifp->if_mtu;
1283                 break;
1284 #endif
1285 #ifdef SLIOCGETMTU
1286         case SLIOCGETMTU:
1287                 *(short*)data = ifp->if_mtu;
1288                 break;
1289 #endif
1290         case SIOCADDMULTI:
1291         case SIOCDELMULTI:
1292                 break;
1293
1294         case SIOCGIFGENERIC:
1295         case SIOCSIFGENERIC:
1296                 rv = sppp_params(sp, cmd, data);
1297                 break;
1298
1299         default:
1300                 rv = ENOTTY;
1301         }
1302         SPPP_UNLOCK(sp);
1303         return rv;
1304 }
1305
1306 /*
1307  * Cisco framing implementation.
1308  */
1309
1310 /*
1311  * Handle incoming Cisco keepalive protocol packets.
1312  */
1313 static void
1314 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1315 {
1316         STDDCL;
1317         struct cisco_packet *h;
1318         u_long me, mymask;
1319
1320         if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1321                 if (debug)
1322                         log(LOG_DEBUG,
1323                             SPP_FMT "cisco invalid packet length: %d bytes\n",
1324                             SPP_ARGS(ifp), m->m_pkthdr.len);
1325                 return;
1326         }
1327         h = mtod (m, struct cisco_packet*);
1328         if (debug)
1329                 log(LOG_DEBUG,
1330                     SPP_FMT "cisco input: %d bytes "
1331                     "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1332                     SPP_ARGS(ifp), m->m_pkthdr.len,
1333                     (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
1334                     (u_int)h->time0, (u_int)h->time1);
1335         switch (ntohl (h->type)) {
1336         default:
1337                 if (debug)
1338                         log(-1, SPP_FMT "cisco unknown packet type: 0x%lx\n",
1339                                SPP_ARGS(ifp), (u_long)ntohl (h->type));
1340                 break;
1341         case CISCO_ADDR_REPLY:
1342                 /* Reply on address request, ignore */
1343                 break;
1344         case CISCO_KEEPALIVE_REQ:
1345                 sp->pp_alivecnt = 0;
1346                 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
1347                 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1348                         /* Local and remote sequence numbers are equal.
1349                          * Probably, the line is in loopback mode. */
1350                         if (sp->pp_loopcnt >= MAXALIVECNT) {
1351                                 printf (SPP_FMT "loopback\n",
1352                                         SPP_ARGS(ifp));
1353                                 sp->pp_loopcnt = 0;
1354                                 if (ifp->if_flags & IFF_UP) {
1355                                         if_down (ifp);
1356                                         sppp_qflush (&sp->pp_cpq);
1357                                 }
1358                         }
1359                         ++sp->pp_loopcnt;
1360
1361                         /* Generate new local sequence number */
1362                         sp->pp_seq[IDX_LCP] = random();
1363                         break;
1364                 }
1365                 sp->pp_loopcnt = 0;
1366                 if (! (ifp->if_flags & IFF_UP) &&
1367                     (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
1368                         if_up(ifp);
1369                         printf (SPP_FMT "up\n", SPP_ARGS(ifp));
1370                 }
1371                 break;
1372         case CISCO_ADDR_REQ:
1373                 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1374                 if (me != 0L)
1375                         sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1376                 break;
1377         }
1378 }
1379
1380 /*
1381  * Send Cisco keepalive packet.
1382  */
1383 static void
1384 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1385 {
1386         STDDCL;
1387         struct ppp_header *h;
1388         struct cisco_packet *ch;
1389         struct mbuf *m;
1390         struct timeval tv;
1391
1392         getmicrouptime(&tv);
1393
1394         MGETHDR (m, M_NOWAIT, MT_DATA);
1395         if (! m)
1396                 return;
1397         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1398         m->m_pkthdr.rcvif = 0;
1399
1400         h = mtod (m, struct ppp_header*);
1401         h->address = CISCO_MULTICAST;
1402         h->control = 0;
1403         h->protocol = htons (CISCO_KEEPALIVE);
1404
1405         ch = (struct cisco_packet*) (h + 1);
1406         ch->type = htonl (type);
1407         ch->par1 = htonl (par1);
1408         ch->par2 = htonl (par2);
1409         ch->rel = -1;
1410
1411         ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1412         ch->time1 = htons ((u_short) tv.tv_sec);
1413
1414         if (debug)
1415                 log(LOG_DEBUG,
1416                     SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1417                         SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
1418                         (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1419
1420         if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
1421                 ifp->if_oerrors++;
1422 }
1423
1424 /*
1425  * PPP protocol implementation.
1426  */
1427
1428 /*
1429  * Send PPP control protocol packet.
1430  */
1431 static void
1432 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1433              u_char ident, u_short len, void *data)
1434 {
1435         STDDCL;
1436         struct ppp_header *h;
1437         struct lcp_header *lh;
1438         struct mbuf *m;
1439
1440         if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1441                 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1442         MGETHDR (m, M_NOWAIT, MT_DATA);
1443         if (! m)
1444                 return;
1445         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1446         m->m_pkthdr.rcvif = 0;
1447
1448         h = mtod (m, struct ppp_header*);
1449         h->address = PPP_ALLSTATIONS;        /* broadcast address */
1450         h->control = PPP_UI;                 /* Unnumbered Info */
1451         h->protocol = htons (proto);         /* Link Control Protocol */
1452
1453         lh = (struct lcp_header*) (h + 1);
1454         lh->type = type;
1455         lh->ident = ident;
1456         lh->len = htons (LCP_HEADER_LEN + len);
1457         if (len)
1458                 bcopy (data, lh+1, len);
1459
1460         if (debug) {
1461                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1462                     SPP_ARGS(ifp),
1463                     sppp_proto_name(proto),
1464                     sppp_cp_type_name (lh->type), lh->ident,
1465                     ntohs (lh->len));
1466                 sppp_print_bytes ((u_char*) (lh+1), len);
1467                 log(-1, ">\n");
1468         }
1469         if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
1470                 ifp->if_oerrors++;
1471 }
1472
1473 /*
1474  * Handle incoming PPP control protocol packets.
1475  */
1476 static void
1477 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1478 {
1479         STDDCL;
1480         struct lcp_header *h;
1481         int len = m->m_pkthdr.len;
1482         int rv;
1483         u_char *p;
1484
1485         if (len < 4) {
1486                 if (debug)
1487                         log(LOG_DEBUG,
1488                             SPP_FMT "%s invalid packet length: %d bytes\n",
1489                             SPP_ARGS(ifp), cp->name, len);
1490                 return;
1491         }
1492         h = mtod (m, struct lcp_header*);
1493         if (debug) {
1494                 log(LOG_DEBUG,
1495                     SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1496                     SPP_ARGS(ifp), cp->name,
1497                     sppp_state_name(sp->state[cp->protoidx]),
1498                     sppp_cp_type_name (h->type), h->ident, ntohs (h->len));
1499                 sppp_print_bytes ((u_char*) (h+1), len-4);
1500                 log(-1, ">\n");
1501         }
1502         if (len > ntohs (h->len))
1503                 len = ntohs (h->len);
1504         p = (u_char *)(h + 1);
1505         switch (h->type) {
1506         case CONF_REQ:
1507                 if (len < 4) {
1508                         if (debug)
1509                                 log(-1, SPP_FMT "%s invalid conf-req length %d\n",
1510                                        SPP_ARGS(ifp), cp->name,
1511                                        len);
1512                         ++ifp->if_ierrors;
1513                         break;
1514                 }
1515                 /* handle states where RCR doesn't get a SCA/SCN */
1516                 switch (sp->state[cp->protoidx]) {
1517                 case STATE_CLOSING:
1518                 case STATE_STOPPING:
1519                         return;
1520                 case STATE_CLOSED:
1521                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1522                                      0, 0);
1523                         return;
1524                 }
1525                 rv = (cp->RCR)(sp, h, len);
1526                 switch (sp->state[cp->protoidx]) {
1527                 case STATE_OPENED:
1528                         (cp->tld)(sp);
1529                         (cp->scr)(sp);
1530                         /* FALLTHROUGH */
1531                 case STATE_ACK_SENT:
1532                 case STATE_REQ_SENT:
1533                         /*
1534                          * sppp_cp_change_state() have the side effect of
1535                          * restarting the timeouts. We want to avoid that
1536                          * if the state don't change, otherwise we won't
1537                          * ever timeout and resend a configuration request
1538                          * that got lost.
1539                          */
1540                         if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
1541                             STATE_REQ_SENT))
1542                                 break;
1543                         sppp_cp_change_state(cp, sp, rv?
1544                                              STATE_ACK_SENT: STATE_REQ_SENT);
1545                         break;
1546                 case STATE_STOPPED:
1547                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1548                         (cp->scr)(sp);
1549                         sppp_cp_change_state(cp, sp, rv?
1550                                              STATE_ACK_SENT: STATE_REQ_SENT);
1551                         break;
1552                 case STATE_ACK_RCVD:
1553                         if (rv) {
1554                                 sppp_cp_change_state(cp, sp, STATE_OPENED);
1555                                 if (debug)
1556                                         log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1557                                             SPP_ARGS(ifp),
1558                                             cp->name);
1559                                 (cp->tlu)(sp);
1560                         } else
1561                                 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1562                         break;
1563                 default:
1564                         printf(SPP_FMT "%s illegal %s in state %s\n",
1565                                SPP_ARGS(ifp), cp->name,
1566                                sppp_cp_type_name(h->type),
1567                                sppp_state_name(sp->state[cp->protoidx]));
1568                         ++ifp->if_ierrors;
1569                 }
1570                 break;
1571         case CONF_ACK:
1572                 if (h->ident != sp->confid[cp->protoidx]) {
1573                         if (debug)
1574                                 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1575                                        SPP_ARGS(ifp), cp->name,
1576                                        h->ident, sp->confid[cp->protoidx]);
1577                         ++ifp->if_ierrors;
1578                         break;
1579                 }
1580                 switch (sp->state[cp->protoidx]) {
1581                 case STATE_CLOSED:
1582                 case STATE_STOPPED:
1583                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1584                         break;
1585                 case STATE_CLOSING:
1586                 case STATE_STOPPING:
1587                         break;
1588                 case STATE_REQ_SENT:
1589                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1590                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1591                         break;
1592                 case STATE_OPENED:
1593                         (cp->tld)(sp);
1594                         /* FALLTHROUGH */
1595                 case STATE_ACK_RCVD:
1596                         (cp->scr)(sp);
1597                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1598                         break;
1599                 case STATE_ACK_SENT:
1600                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1601                         sppp_cp_change_state(cp, sp, STATE_OPENED);
1602                         if (debug)
1603                                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1604                                        SPP_ARGS(ifp), cp->name);
1605                         (cp->tlu)(sp);
1606                         break;
1607                 default:
1608                         printf(SPP_FMT "%s illegal %s in state %s\n",
1609                                SPP_ARGS(ifp), cp->name,
1610                                sppp_cp_type_name(h->type),
1611                                sppp_state_name(sp->state[cp->protoidx]));
1612                         ++ifp->if_ierrors;
1613                 }
1614                 break;
1615         case CONF_NAK:
1616         case CONF_REJ:
1617                 if (h->ident != sp->confid[cp->protoidx]) {
1618                         if (debug)
1619                                 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1620                                        SPP_ARGS(ifp), cp->name,
1621                                        h->ident, sp->confid[cp->protoidx]);
1622                         ++ifp->if_ierrors;
1623                         break;
1624                 }
1625                 if (h->type == CONF_NAK)
1626                         (cp->RCN_nak)(sp, h, len);
1627                 else /* CONF_REJ */
1628                         (cp->RCN_rej)(sp, h, len);
1629
1630                 switch (sp->state[cp->protoidx]) {
1631                 case STATE_CLOSED:
1632                 case STATE_STOPPED:
1633                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1634                         break;
1635                 case STATE_REQ_SENT:
1636                 case STATE_ACK_SENT:
1637                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1638                         /*
1639                          * Slow things down a bit if we think we might be
1640                          * in loopback. Depend on the timeout to send the
1641                          * next configuration request.
1642                          */
1643                         if (sp->pp_loopcnt)
1644                                 break;
1645                         (cp->scr)(sp);
1646                         break;
1647                 case STATE_OPENED:
1648                         (cp->tld)(sp);
1649                         /* FALLTHROUGH */
1650                 case STATE_ACK_RCVD:
1651                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1652                         (cp->scr)(sp);
1653                         break;
1654                 case STATE_CLOSING:
1655                 case STATE_STOPPING:
1656                         break;
1657                 default:
1658                         printf(SPP_FMT "%s illegal %s in state %s\n",
1659                                SPP_ARGS(ifp), cp->name,
1660                                sppp_cp_type_name(h->type),
1661                                sppp_state_name(sp->state[cp->protoidx]));
1662                         ++ifp->if_ierrors;
1663                 }
1664                 break;
1665
1666         case TERM_REQ:
1667                 switch (sp->state[cp->protoidx]) {
1668                 case STATE_ACK_RCVD:
1669                 case STATE_ACK_SENT:
1670                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1671                         /* FALLTHROUGH */
1672                 case STATE_CLOSED:
1673                 case STATE_STOPPED:
1674                 case STATE_CLOSING:
1675                 case STATE_STOPPING:
1676                 case STATE_REQ_SENT:
1677                   sta:
1678                         /* Send Terminate-Ack packet. */
1679                         if (debug)
1680                                 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1681                                     SPP_ARGS(ifp), cp->name);
1682                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1683                         break;
1684                 case STATE_OPENED:
1685                         (cp->tld)(sp);
1686                         sp->rst_counter[cp->protoidx] = 0;
1687                         sppp_cp_change_state(cp, sp, STATE_STOPPING);
1688                         goto sta;
1689                         break;
1690                 default:
1691                         printf(SPP_FMT "%s illegal %s in state %s\n",
1692                                SPP_ARGS(ifp), cp->name,
1693                                sppp_cp_type_name(h->type),
1694                                sppp_state_name(sp->state[cp->protoidx]));
1695                         ++ifp->if_ierrors;
1696                 }
1697                 break;
1698         case TERM_ACK:
1699                 switch (sp->state[cp->protoidx]) {
1700                 case STATE_CLOSED:
1701                 case STATE_STOPPED:
1702                 case STATE_REQ_SENT:
1703                 case STATE_ACK_SENT:
1704                         break;
1705                 case STATE_CLOSING:
1706                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
1707                         (cp->tlf)(sp);
1708                         break;
1709                 case STATE_STOPPING:
1710                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
1711                         (cp->tlf)(sp);
1712                         break;
1713                 case STATE_ACK_RCVD:
1714                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1715                         break;
1716                 case STATE_OPENED:
1717                         (cp->tld)(sp);
1718                         (cp->scr)(sp);
1719                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1720                         break;
1721                 default:
1722                         printf(SPP_FMT "%s illegal %s in state %s\n",
1723                                SPP_ARGS(ifp), cp->name,
1724                                sppp_cp_type_name(h->type),
1725                                sppp_state_name(sp->state[cp->protoidx]));
1726                         ++ifp->if_ierrors;
1727                 }
1728                 break;
1729         case CODE_REJ:
1730                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1731                 log(LOG_INFO,
1732                     SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1733                     "danger will robinson\n",
1734                     SPP_ARGS(ifp), cp->name,
1735                     sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1736                 switch (sp->state[cp->protoidx]) {
1737                 case STATE_CLOSED:
1738                 case STATE_STOPPED:
1739                 case STATE_REQ_SENT:
1740                 case STATE_ACK_SENT:
1741                 case STATE_CLOSING:
1742                 case STATE_STOPPING:
1743                 case STATE_OPENED:
1744                         break;
1745                 case STATE_ACK_RCVD:
1746                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1747                         break;
1748                 default:
1749                         printf(SPP_FMT "%s illegal %s in state %s\n",
1750                                SPP_ARGS(ifp), cp->name,
1751                                sppp_cp_type_name(h->type),
1752                                sppp_state_name(sp->state[cp->protoidx]));
1753                         ++ifp->if_ierrors;
1754                 }
1755                 break;
1756         case PROTO_REJ:
1757             {
1758                 int catastrophic;
1759                 const struct cp *upper;
1760                 int i;
1761                 u_int16_t proto;
1762
1763                 catastrophic = 0;
1764                 upper = NULL;
1765                 proto = ntohs(*((u_int16_t *)p));
1766                 for (i = 0; i < IDX_COUNT; i++) {
1767                         if (cps[i]->proto == proto) {
1768                                 upper = cps[i];
1769                                 break;
1770                         }
1771                 }
1772                 if (upper == NULL)
1773                         catastrophic++;
1774
1775                 if (catastrophic || debug)
1776                         log(catastrophic? LOG_INFO: LOG_DEBUG,
1777                             SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1778                             SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
1779                             sppp_cp_type_name(h->type), proto,
1780                             upper ? upper->name : "unknown",
1781                             upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1782
1783                 /*
1784                  * if we got RXJ+ against conf-req, the peer does not implement
1785                  * this particular protocol type.  terminate the protocol.
1786                  */
1787                 if (upper && !catastrophic) {
1788                         if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1789                                 upper->Close(sp);
1790                                 break;
1791                         }
1792                 }
1793
1794                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1795                 switch (sp->state[cp->protoidx]) {
1796                 case STATE_CLOSED:
1797                 case STATE_STOPPED:
1798                 case STATE_REQ_SENT:
1799                 case STATE_ACK_SENT:
1800                 case STATE_CLOSING:
1801                 case STATE_STOPPING:
1802                 case STATE_OPENED:
1803                         break;
1804                 case STATE_ACK_RCVD:
1805                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1806                         break;
1807                 default:
1808                         printf(SPP_FMT "%s illegal %s in state %s\n",
1809                                SPP_ARGS(ifp), cp->name,
1810                                sppp_cp_type_name(h->type),
1811                                sppp_state_name(sp->state[cp->protoidx]));
1812                         ++ifp->if_ierrors;
1813                 }
1814                 break;
1815             }
1816         case DISC_REQ:
1817                 if (cp->proto != PPP_LCP)
1818                         goto illegal;
1819                 /* Discard the packet. */
1820                 break;
1821         case ECHO_REQ:
1822                 if (cp->proto != PPP_LCP)
1823                         goto illegal;
1824                 if (sp->state[cp->protoidx] != STATE_OPENED) {
1825                         if (debug)
1826                                 log(-1, SPP_FMT "lcp echo req but lcp closed\n",
1827                                        SPP_ARGS(ifp));
1828                         ++ifp->if_ierrors;
1829                         break;
1830                 }
1831                 if (len < 8) {
1832                         if (debug)
1833                                 log(-1, SPP_FMT "invalid lcp echo request "
1834                                        "packet length: %d bytes\n",
1835                                        SPP_ARGS(ifp), len);
1836                         break;
1837                 }
1838                 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
1839                     ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1840                         /* Line loopback mode detected. */
1841                         printf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1842                         sp->pp_loopcnt = MAXALIVECNT * 5;
1843                         if_down (ifp);
1844                         sppp_qflush (&sp->pp_cpq);
1845
1846                         /* Shut down the PPP link. */
1847                         /* XXX */
1848                         lcp.Down(sp);
1849                         lcp.Up(sp);
1850                         break;
1851                 }
1852                 *(long*)(h+1) = htonl (sp->lcp.magic);
1853                 if (debug)
1854                         log(-1, SPP_FMT "got lcp echo req, sending echo rep\n",
1855                                SPP_ARGS(ifp));
1856                 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1857                 break;
1858         case ECHO_REPLY:
1859                 if (cp->proto != PPP_LCP)
1860                         goto illegal;
1861                 if (h->ident != sp->lcp.echoid) {
1862                         ++ifp->if_ierrors;
1863                         break;
1864                 }
1865                 if (len < 8) {
1866                         if (debug)
1867                                 log(-1, SPP_FMT "lcp invalid echo reply "
1868                                        "packet length: %d bytes\n",
1869                                        SPP_ARGS(ifp), len);
1870                         break;
1871                 }
1872                 if (debug)
1873                         log(-1, SPP_FMT "lcp got echo rep\n",
1874                                SPP_ARGS(ifp));
1875                 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
1876                     ntohl (*(long*)(h+1)) != sp->lcp.magic)
1877                         sp->pp_alivecnt = 0;
1878                 break;
1879         default:
1880                 /* Unknown packet type -- send Code-Reject packet. */
1881           illegal:
1882                 if (debug)
1883                         log(-1, SPP_FMT "%s send code-rej for 0x%x\n",
1884                                SPP_ARGS(ifp), cp->name, h->type);
1885                 sppp_cp_send(sp, cp->proto, CODE_REJ,
1886                              ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1887                 ++ifp->if_ierrors;
1888         }
1889 }
1890
1891
1892 /*
1893  * The generic part of all Up/Down/Open/Close/TO event handlers.
1894  * Basically, the state transition handling in the automaton.
1895  */
1896 static void
1897 sppp_up_event(const struct cp *cp, struct sppp *sp)
1898 {
1899         STDDCL;
1900
1901         if (debug)
1902                 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
1903                     SPP_ARGS(ifp), cp->name,
1904                     sppp_state_name(sp->state[cp->protoidx]));
1905
1906         switch (sp->state[cp->protoidx]) {
1907         case STATE_INITIAL:
1908                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1909                 break;
1910         case STATE_STARTING:
1911                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1912                 (cp->scr)(sp);
1913                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1914                 break;
1915         default:
1916                 printf(SPP_FMT "%s illegal up in state %s\n",
1917                        SPP_ARGS(ifp), cp->name,
1918                        sppp_state_name(sp->state[cp->protoidx]));
1919         }
1920 }
1921
1922 static void
1923 sppp_down_event(const struct cp *cp, struct sppp *sp)
1924 {
1925         STDDCL;
1926
1927         if (debug)
1928                 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
1929                     SPP_ARGS(ifp), cp->name,
1930                     sppp_state_name(sp->state[cp->protoidx]));
1931
1932         switch (sp->state[cp->protoidx]) {
1933         case STATE_CLOSED:
1934         case STATE_CLOSING:
1935                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1936                 break;
1937         case STATE_STOPPED:
1938                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1939                 (cp->tls)(sp);
1940                 break;
1941         case STATE_STOPPING:
1942         case STATE_REQ_SENT:
1943         case STATE_ACK_RCVD:
1944         case STATE_ACK_SENT:
1945                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1946                 break;
1947         case STATE_OPENED:
1948                 (cp->tld)(sp);
1949                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1950                 break;
1951         default:
1952                 printf(SPP_FMT "%s illegal down in state %s\n",
1953                        SPP_ARGS(ifp), cp->name,
1954                        sppp_state_name(sp->state[cp->protoidx]));
1955         }
1956 }
1957
1958
1959 static void
1960 sppp_open_event(const struct cp *cp, struct sppp *sp)
1961 {
1962         STDDCL;
1963
1964         if (debug)
1965                 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1966                     SPP_ARGS(ifp), cp->name,
1967                     sppp_state_name(sp->state[cp->protoidx]));
1968
1969         switch (sp->state[cp->protoidx]) {
1970         case STATE_INITIAL:
1971                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1972                 (cp->tls)(sp);
1973                 break;
1974         case STATE_STARTING:
1975                 break;
1976         case STATE_CLOSED:
1977                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1978                 (cp->scr)(sp);
1979                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1980                 break;
1981         case STATE_STOPPED:
1982                 /*
1983                  * Try escaping stopped state.  This seems to bite
1984                  * people occasionally, in particular for IPCP,
1985                  * presumably following previous IPCP negotiation
1986                  * aborts.  Somehow, we must have missed a Down event
1987                  * which would have caused a transition into starting
1988                  * state, so as a bandaid we force the Down event now.
1989                  * This effectively implements (something like the)
1990                  * `restart' option mentioned in the state transition
1991                  * table of RFC 1661.
1992                  */
1993                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1994                 (cp->tls)(sp);
1995                 break;
1996         case STATE_STOPPING:
1997         case STATE_REQ_SENT:
1998         case STATE_ACK_RCVD:
1999         case STATE_ACK_SENT:
2000         case STATE_OPENED:
2001                 break;
2002         case STATE_CLOSING:
2003                 sppp_cp_change_state(cp, sp, STATE_STOPPING);
2004                 break;
2005         }
2006 }
2007
2008
2009 static void
2010 sppp_close_event(const struct cp *cp, struct sppp *sp)
2011 {
2012         STDDCL;
2013
2014         if (debug)
2015                 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
2016                     SPP_ARGS(ifp), cp->name,
2017                     sppp_state_name(sp->state[cp->protoidx]));
2018
2019         switch (sp->state[cp->protoidx]) {
2020         case STATE_INITIAL:
2021         case STATE_CLOSED:
2022         case STATE_CLOSING:
2023                 break;
2024         case STATE_STARTING:
2025                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
2026                 (cp->tlf)(sp);
2027                 break;
2028         case STATE_STOPPED:
2029                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2030                 break;
2031         case STATE_STOPPING:
2032                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2033                 break;
2034         case STATE_OPENED:
2035                 (cp->tld)(sp);
2036                 /* FALLTHROUGH */
2037         case STATE_REQ_SENT:
2038         case STATE_ACK_RCVD:
2039         case STATE_ACK_SENT:
2040                 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
2041                 sppp_cp_send(sp, cp->proto, TERM_REQ,
2042                              ++sp->pp_seq[cp->protoidx], 0, 0);
2043                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2044                 break;
2045         }
2046 }
2047
2048 static void
2049 sppp_to_event(const struct cp *cp, struct sppp *sp)
2050 {
2051         STDDCL;
2052
2053         SPPP_LOCK(sp);
2054         if (debug)
2055                 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
2056                     SPP_ARGS(ifp), cp->name,
2057                     sppp_state_name(sp->state[cp->protoidx]),
2058                     sp->rst_counter[cp->protoidx]);
2059
2060         if (--sp->rst_counter[cp->protoidx] < 0)
2061                 /* TO- event */
2062                 switch (sp->state[cp->protoidx]) {
2063                 case STATE_CLOSING:
2064                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
2065                         (cp->tlf)(sp);
2066                         break;
2067                 case STATE_STOPPING:
2068                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2069                         (cp->tlf)(sp);
2070                         break;
2071                 case STATE_REQ_SENT:
2072                 case STATE_ACK_RCVD:
2073                 case STATE_ACK_SENT:
2074                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2075                         (cp->tlf)(sp);
2076                         break;
2077                 }
2078         else
2079                 /* TO+ event */
2080                 switch (sp->state[cp->protoidx]) {
2081                 case STATE_CLOSING:
2082                 case STATE_STOPPING:
2083                         sppp_cp_send(sp, cp->proto, TERM_REQ,
2084                                      ++sp->pp_seq[cp->protoidx], 0, 0);
2085                         callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2086                                       cp->TO, (void *)sp);
2087                         break;
2088                 case STATE_REQ_SENT:
2089                 case STATE_ACK_RCVD:
2090                         (cp->scr)(sp);
2091                         /* sppp_cp_change_state() will restart the timer */
2092                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
2093                         break;
2094                 case STATE_ACK_SENT:
2095                         (cp->scr)(sp);
2096                         callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2097                                       cp->TO, (void *)sp);
2098                         break;
2099                 }
2100
2101         SPPP_UNLOCK(sp);
2102 }
2103
2104 /*
2105  * Change the state of a control protocol in the state automaton.
2106  * Takes care of starting/stopping the restart timer.
2107  */
2108 static void
2109 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
2110 {
2111         sp->state[cp->protoidx] = newstate;
2112
2113         callout_stop (&sp->ch[cp->protoidx]);
2114
2115         switch (newstate) {
2116         case STATE_INITIAL:
2117         case STATE_STARTING:
2118         case STATE_CLOSED:
2119         case STATE_STOPPED:
2120         case STATE_OPENED:
2121                 break;
2122         case STATE_CLOSING:
2123         case STATE_STOPPING:
2124         case STATE_REQ_SENT:
2125         case STATE_ACK_RCVD:
2126         case STATE_ACK_SENT:
2127                 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
2128                               cp->TO, (void *)sp);
2129                 break;
2130         }
2131 }
2132
2133 /*
2134  *--------------------------------------------------------------------------*
2135  *                                                                          *
2136  *                         The LCP implementation.                          *
2137  *                                                                          *
2138  *--------------------------------------------------------------------------*
2139  */
2140 static void
2141 sppp_pp_up(struct sppp *sp)
2142 {
2143         SPPP_LOCK(sp);
2144         lcp.Up(sp);
2145         SPPP_UNLOCK(sp);
2146 }
2147
2148 static void
2149 sppp_pp_down(struct sppp *sp)
2150 {
2151         SPPP_LOCK(sp);
2152         lcp.Down(sp);
2153         SPPP_UNLOCK(sp);
2154 }
2155
2156 static void
2157 sppp_lcp_init(struct sppp *sp)
2158 {
2159         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2160         sp->lcp.magic = 0;
2161         sp->state[IDX_LCP] = STATE_INITIAL;
2162         sp->fail_counter[IDX_LCP] = 0;
2163         sp->pp_seq[IDX_LCP] = 0;
2164         sp->pp_rseq[IDX_LCP] = 0;
2165         sp->lcp.protos = 0;
2166         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2167
2168         /* Note that these values are  relevant for all control protocols */
2169         sp->lcp.timeout = 3 * hz;
2170         sp->lcp.max_terminate = 2;
2171         sp->lcp.max_configure = 10;
2172         sp->lcp.max_failure = 10;
2173         callout_init(&sp->ch[IDX_LCP], CALLOUT_MPSAFE);
2174 }
2175
2176 static void
2177 sppp_lcp_up(struct sppp *sp)
2178 {
2179         STDDCL;
2180
2181         sp->pp_alivecnt = 0;
2182         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2183         sp->lcp.magic = 0;
2184         sp->lcp.protos = 0;
2185         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2186         /*
2187          * If we are authenticator, negotiate LCP_AUTH
2188          */
2189         if (sp->hisauth.proto != 0)
2190                 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2191         else
2192                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2193         sp->pp_flags &= ~PP_NEEDAUTH;
2194         /*
2195          * If this interface is passive or dial-on-demand, and we are
2196          * still in Initial state, it means we've got an incoming
2197          * call.  Activate the interface.
2198          */
2199         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2200                 if (debug)
2201                         log(LOG_DEBUG,
2202                             SPP_FMT "Up event", SPP_ARGS(ifp));
2203                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
2204                 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2205                         if (debug)
2206                                 log(-1, "(incoming call)\n");
2207                         sp->pp_flags |= PP_CALLIN;
2208                         lcp.Open(sp);
2209                 } else if (debug)
2210                         log(-1, "\n");
2211         } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2212                    (sp->state[IDX_LCP] == STATE_INITIAL)) {
2213                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
2214                 lcp.Open(sp);
2215         }
2216
2217         sppp_up_event(&lcp, sp);
2218 }
2219
2220 static void
2221 sppp_lcp_down(struct sppp *sp)
2222 {
2223         STDDCL;
2224
2225         sppp_down_event(&lcp, sp);
2226
2227         /*
2228          * If this is neither a dial-on-demand nor a passive
2229          * interface, simulate an ``ifconfig down'' action, so the
2230          * administrator can force a redial by another ``ifconfig
2231          * up''.  XXX For leased line operation, should we immediately
2232          * try to reopen the connection here?
2233          */
2234         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2235                 log(LOG_INFO,
2236                     SPP_FMT "Down event, taking interface down.\n",
2237                     SPP_ARGS(ifp));
2238                 if_down(ifp);
2239         } else {
2240                 if (debug)
2241                         log(LOG_DEBUG,
2242                             SPP_FMT "Down event (carrier loss)\n",
2243                             SPP_ARGS(ifp));
2244                 sp->pp_flags &= ~PP_CALLIN;
2245                 if (sp->state[IDX_LCP] != STATE_INITIAL)
2246                         lcp.Close(sp);
2247                 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
2248         }
2249 }
2250
2251 static void
2252 sppp_lcp_open(struct sppp *sp)
2253 {
2254         sppp_open_event(&lcp, sp);
2255 }
2256
2257 static void
2258 sppp_lcp_close(struct sppp *sp)
2259 {
2260         sppp_close_event(&lcp, sp);
2261 }
2262
2263 static void
2264 sppp_lcp_TO(void *cookie)
2265 {
2266         sppp_to_event(&lcp, (struct sppp *)cookie);
2267 }
2268
2269 /*
2270  * Analyze a configure request.  Return true if it was agreeable, and
2271  * caused action sca, false if it has been rejected or nak'ed, and
2272  * caused action scn.  (The return value is used to make the state
2273  * transition decision in the state automaton.)
2274  */
2275 static int
2276 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2277 {
2278         STDDCL;
2279         u_char *buf, *r, *p;
2280         int origlen, rlen;
2281         u_long nmagic;
2282         u_short authproto;
2283
2284         len -= 4;
2285         origlen = len;
2286         buf = r = malloc (len, M_TEMP, M_NOWAIT);
2287         if (! buf)
2288                 return (0);
2289
2290         if (debug)
2291                 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
2292                     SPP_ARGS(ifp));
2293
2294         /* pass 1: check for things that need to be rejected */
2295         p = (void*) (h+1);
2296         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2297             len-=p[1], p+=p[1]) {
2298                 if (debug)
2299                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2300                 switch (*p) {
2301                 case LCP_OPT_MAGIC:
2302                         /* Magic number. */
2303                         if (len >= 6 && p[1] == 6)
2304                                 continue;
2305                         if (debug)
2306                                 log(-1, "[invalid] ");
2307                         break;
2308                 case LCP_OPT_ASYNC_MAP:
2309                         /* Async control character map. */
2310                         if (len >= 6 && p[1] == 6)
2311                                 continue;
2312                         if (debug)
2313                                 log(-1, "[invalid] ");
2314                         break;
2315                 case LCP_OPT_MRU:
2316                         /* Maximum receive unit. */
2317                         if (len >= 4 && p[1] == 4)
2318                                 continue;
2319                         if (debug)
2320                                 log(-1, "[invalid] ");
2321                         break;
2322                 case LCP_OPT_AUTH_PROTO:
2323                         if (len < 4) {
2324                                 if (debug)
2325                                         log(-1, "[invalid] ");
2326                                 break;
2327                         }
2328                         authproto = (p[2] << 8) + p[3];
2329                         if (authproto == PPP_CHAP && p[1] != 5) {
2330                                 if (debug)
2331                                         log(-1, "[invalid chap len] ");
2332                                 break;
2333                         }
2334                         if (sp->myauth.proto == 0) {
2335                                 /* we are not configured to do auth */
2336                                 if (debug)
2337                                         log(-1, "[not configured] ");
2338                                 break;
2339                         }
2340                         /*
2341                          * Remote want us to authenticate, remember this,
2342                          * so we stay in PHASE_AUTHENTICATE after LCP got
2343                          * up.
2344                          */
2345                         sp->pp_flags |= PP_NEEDAUTH;
2346                         continue;
2347                 default:
2348                         /* Others not supported. */
2349                         if (debug)
2350                                 log(-1, "[rej] ");
2351                         break;
2352                 }
2353                 /* Add the option to rejected list. */
2354                 bcopy (p, r, p[1]);
2355                 r += p[1];
2356                 rlen += p[1];
2357         }
2358         if (rlen) {
2359                 if (debug)
2360                         log(-1, " send conf-rej\n");
2361                 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2362                 return 0;
2363         } else if (debug)
2364                 log(-1, "\n");
2365
2366         /*
2367          * pass 2: check for option values that are unacceptable and
2368          * thus require to be nak'ed.
2369          */
2370         if (debug)
2371                 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2372                     SPP_ARGS(ifp));
2373
2374         p = (void*) (h+1);
2375         len = origlen;
2376         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2377             len-=p[1], p+=p[1]) {
2378                 if (debug)
2379                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2380                 switch (*p) {
2381                 case LCP_OPT_MAGIC:
2382                         /* Magic number -- extract. */
2383                         nmagic = (u_long)p[2] << 24 |
2384                                 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2385                         if (nmagic != sp->lcp.magic) {
2386                                 sp->pp_loopcnt = 0;
2387                                 if (debug)
2388                                         log(-1, "0x%lx ", nmagic);
2389                                 continue;
2390                         }
2391                         if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
2392                                 log(-1, "[glitch] ");
2393                         ++sp->pp_loopcnt;
2394                         /*
2395                          * We negate our magic here, and NAK it.  If
2396                          * we see it later in an NAK packet, we
2397                          * suggest a new one.
2398                          */
2399                         nmagic = ~sp->lcp.magic;
2400                         /* Gonna NAK it. */
2401                         p[2] = nmagic >> 24;
2402                         p[3] = nmagic >> 16;
2403                         p[4] = nmagic >> 8;
2404                         p[5] = nmagic;
2405                         break;
2406
2407                 case LCP_OPT_ASYNC_MAP:
2408                         /*
2409                          * Async control character map -- just ignore it.
2410                          *
2411                          * Quote from RFC 1662, chapter 6:
2412                          * To enable this functionality, synchronous PPP
2413                          * implementations MUST always respond to the
2414                          * Async-Control-Character-Map Configuration
2415                          * Option with the LCP Configure-Ack.  However,
2416                          * acceptance of the Configuration Option does
2417                          * not imply that the synchronous implementation
2418                          * will do any ACCM mapping.  Instead, all such
2419                          * octet mapping will be performed by the
2420                          * asynchronous-to-synchronous converter.
2421                          */
2422                         continue;
2423
2424                 case LCP_OPT_MRU:
2425                         /*
2426                          * Maximum receive unit.  Always agreeable,
2427                          * but ignored by now.
2428                          */
2429                         sp->lcp.their_mru = p[2] * 256 + p[3];
2430                         if (debug)
2431                                 log(-1, "%lu ", sp->lcp.their_mru);
2432                         continue;
2433
2434                 case LCP_OPT_AUTH_PROTO:
2435                         authproto = (p[2] << 8) + p[3];
2436                         if (sp->myauth.proto != authproto) {
2437                                 /* not agreed, nak */
2438                                 if (debug)
2439                                         log(-1, "[mine %s != his %s] ",
2440                                                sppp_proto_name(sp->hisauth.proto),
2441                                                sppp_proto_name(authproto));
2442                                 p[2] = sp->myauth.proto >> 8;
2443                                 p[3] = sp->myauth.proto;
2444                                 break;
2445                         }
2446                         if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2447                                 if (debug)
2448                                         log(-1, "[chap not MD5] ");
2449                                 p[4] = CHAP_MD5;
2450                                 break;
2451                         }
2452                         continue;
2453                 }
2454                 /* Add the option to nak'ed list. */
2455                 bcopy (p, r, p[1]);
2456                 r += p[1];
2457                 rlen += p[1];
2458         }
2459         if (rlen) {
2460                 /*
2461                  * Local and remote magics equal -- loopback?
2462                  */
2463                 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2464                         if (sp->pp_loopcnt == MAXALIVECNT*5)
2465                                 printf (SPP_FMT "loopback\n",
2466                                         SPP_ARGS(ifp));
2467                         if (ifp->if_flags & IFF_UP) {
2468                                 if_down(ifp);
2469                                 sppp_qflush(&sp->pp_cpq);
2470                                 /* XXX ? */
2471                                 lcp.Down(sp);
2472                                 lcp.Up(sp);
2473                         }
2474                 } else if (!sp->pp_loopcnt &&
2475                            ++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2476                         if (debug)
2477                                 log(-1, " max_failure (%d) exceeded, "
2478                                        "send conf-rej\n",
2479                                        sp->lcp.max_failure);
2480                         sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2481                 } else {
2482                         if (debug)
2483                                 log(-1, " send conf-nak\n");
2484                         sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2485                 }
2486         } else {
2487                 if (debug)
2488                         log(-1, " send conf-ack\n");
2489                 sp->fail_counter[IDX_LCP] = 0;
2490                 sp->pp_loopcnt = 0;
2491                 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2492                               h->ident, origlen, h+1);
2493         }
2494
2495         free (buf, M_TEMP);
2496         return (rlen == 0);
2497 }
2498
2499 /*
2500  * Analyze the LCP Configure-Reject option list, and adjust our
2501  * negotiation.
2502  */
2503 static void
2504 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2505 {
2506         STDDCL;
2507         u_char *buf, *p;
2508
2509         len -= 4;
2510         buf = malloc (len, M_TEMP, M_NOWAIT);
2511         if (!buf)
2512                 return;
2513
2514         if (debug)
2515                 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2516                     SPP_ARGS(ifp));
2517
2518         p = (void*) (h+1);
2519         for (; len >= 2 && p[1] >= 2 && len >= p[1];
2520             len -= p[1], p += p[1]) {
2521                 if (debug)
2522                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2523                 switch (*p) {
2524                 case LCP_OPT_MAGIC:
2525                         /* Magic number -- can't use it, use 0 */
2526                         sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2527                         sp->lcp.magic = 0;
2528                         break;
2529                 case LCP_OPT_MRU:
2530                         /*
2531                          * Should not be rejected anyway, since we only
2532                          * negotiate a MRU if explicitly requested by
2533                          * peer.
2534                          */
2535                         sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2536                         break;
2537                 case LCP_OPT_AUTH_PROTO:
2538                         /*
2539                          * Peer doesn't want to authenticate himself,
2540                          * deny unless this is a dialout call, and
2541                          * AUTHFLAG_NOCALLOUT is set.
2542                          */
2543                         if ((sp->pp_flags & PP_CALLIN) == 0 &&
2544                             (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2545                                 if (debug)
2546                                         log(-1, "[don't insist on auth "
2547                                                "for callout]");
2548                                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2549                                 break;
2550                         }
2551                         if (debug)
2552                                 log(-1, "[access denied]\n");
2553                         lcp.Close(sp);
2554                         break;
2555                 }
2556         }
2557         if (debug)
2558                 log(-1, "\n");
2559         free (buf, M_TEMP);
2560         return;
2561 }
2562
2563 /*
2564  * Analyze the LCP Configure-NAK option list, and adjust our
2565  * negotiation.
2566  */
2567 static void
2568 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2569 {
2570         STDDCL;
2571         u_char *buf, *p;
2572         u_long magic;
2573
2574         len -= 4;
2575         buf = malloc (len, M_TEMP, M_NOWAIT);
2576         if (!buf)
2577                 return;
2578
2579         if (debug)
2580                 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2581                     SPP_ARGS(ifp));
2582
2583         p = (void*) (h+1);
2584         for (; len >= 2 && p[1] >= 2 && len >= p[1];
2585             len -= p[1], p += p[1]) {
2586                 if (debug)
2587                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2588                 switch (*p) {
2589                 case LCP_OPT_MAGIC:
2590                         /* Magic number -- renegotiate */
2591                         if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2592                             len >= 6 && p[1] == 6) {
2593                                 magic = (u_long)p[2] << 24 |
2594                                         (u_long)p[3] << 16 | p[4] << 8 | p[5];
2595                                 /*
2596                                  * If the remote magic is our negated one,
2597                                  * this looks like a loopback problem.
2598                                  * Suggest a new magic to make sure.
2599                                  */
2600                                 if (magic == ~sp->lcp.magic) {
2601                                         if (debug)
2602                                                 log(-1, "magic glitch ");
2603                                         sp->lcp.magic = random();
2604                                 } else {
2605                                         sp->lcp.magic = magic;
2606                                         if (debug)
2607                                                 log(-1, "%lu ", magic);
2608                                 }
2609                         }
2610                         break;
2611                 case LCP_OPT_MRU:
2612                         /*
2613                          * Peer wants to advise us to negotiate an MRU.
2614                          * Agree on it if it's reasonable, or use
2615                          * default otherwise.
2616                          */
2617                         if (len >= 4 && p[1] == 4) {
2618                                 u_int mru = p[2] * 256 + p[3];
2619                                 if (debug)
2620                                         log(-1, "%d ", mru);
2621                                 if (mru < PP_MTU || mru > PP_MAX_MRU)
2622                                         mru = PP_MTU;
2623                                 sp->lcp.mru = mru;
2624                                 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2625                         }
2626                         break;
2627                 case LCP_OPT_AUTH_PROTO:
2628                         /*
2629                          * Peer doesn't like our authentication method,
2630                          * deny.
2631                          */
2632                         if (debug)
2633                                 log(-1, "[access denied]\n");
2634                         lcp.Close(sp);
2635                         break;
2636                 }
2637         }
2638         if (debug)
2639                 log(-1, "\n");
2640         free (buf, M_TEMP);
2641         return;
2642 }
2643
2644 static void
2645 sppp_lcp_tlu(struct sppp *sp)
2646 {
2647         STDDCL;
2648         int i;
2649         u_long mask;
2650
2651         /* XXX ? */
2652         if (! (ifp->if_flags & IFF_UP) &&
2653             (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
2654                 /* Coming out of loopback mode. */
2655                 if_up(ifp);
2656                 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
2657         }
2658
2659         for (i = 0; i < IDX_COUNT; i++)
2660                 if ((cps[i])->flags & CP_QUAL)
2661                         (cps[i])->Open(sp);
2662
2663         if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2664             (sp->pp_flags & PP_NEEDAUTH) != 0)
2665                 sp->pp_phase = PHASE_AUTHENTICATE;
2666         else
2667                 sp->pp_phase = PHASE_NETWORK;
2668
2669         if (debug)
2670                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2671                     sppp_phase_name(sp->pp_phase));
2672
2673         /*
2674          * Open all authentication protocols.  This is even required
2675          * if we already proceeded to network phase, since it might be
2676          * that remote wants us to authenticate, so we might have to
2677          * send a PAP request.  Undesired authentication protocols
2678          * don't do anything when they get an Open event.
2679          */
2680         for (i = 0; i < IDX_COUNT; i++)
2681                 if ((cps[i])->flags & CP_AUTH)
2682                         (cps[i])->Open(sp);
2683
2684         if (sp->pp_phase == PHASE_NETWORK) {
2685                 /* Notify all NCPs. */
2686                 for (i = 0; i < IDX_COUNT; i++)
2687                         if (((cps[i])->flags & CP_NCP) &&
2688                             /*
2689                              * XXX
2690                              * Hack to administratively disable IPv6 if
2691                              * not desired.  Perhaps we should have another
2692                              * flag for this, but right now, we can make
2693                              * all struct cp's read/only.
2694                              */
2695                             (cps[i] != &ipv6cp ||
2696                              (sp->confflags & CONF_ENABLE_IPV6)))
2697                                 (cps[i])->Open(sp);
2698         }
2699
2700         /* Send Up events to all started protos. */
2701         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2702                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2703                         (cps[i])->Up(sp);
2704
2705         /* notify low-level driver of state change */
2706         if (sp->pp_chg)
2707                 sp->pp_chg(sp, (int)sp->pp_phase);
2708
2709         if (sp->pp_phase == PHASE_NETWORK)
2710                 /* if no NCP is starting, close down */
2711                 sppp_lcp_check_and_close(sp);
2712 }
2713
2714 static void
2715 sppp_lcp_tld(struct sppp *sp)
2716 {
2717         STDDCL;
2718         int i;
2719         u_long mask;
2720
2721         sp->pp_phase = PHASE_TERMINATE;
2722
2723         if (debug)
2724                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2725                     sppp_phase_name(sp->pp_phase));
2726
2727         /*
2728          * Take upper layers down.  We send the Down event first and
2729          * the Close second to prevent the upper layers from sending
2730          * ``a flurry of terminate-request packets'', as the RFC
2731          * describes it.
2732          */
2733         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2734                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2735                         (cps[i])->Down(sp);
2736                         (cps[i])->Close(sp);
2737                 }
2738 }
2739
2740 static void
2741 sppp_lcp_tls(struct sppp *sp)
2742 {
2743         STDDCL;
2744
2745         sp->pp_phase = PHASE_ESTABLISH;
2746
2747         if (debug)
2748                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2749                     sppp_phase_name(sp->pp_phase));
2750
2751         /* Notify lower layer if desired. */
2752         if (sp->pp_tls)
2753                 (sp->pp_tls)(sp);
2754         else
2755                 (sp->pp_up)(sp);
2756 }
2757
2758 static void
2759 sppp_lcp_tlf(struct sppp *sp)
2760 {
2761         STDDCL;
2762
2763         sp->pp_phase = PHASE_DEAD;
2764         if (debug)
2765                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2766                     sppp_phase_name(sp->pp_phase));
2767
2768         /* Notify lower layer if desired. */
2769         if (sp->pp_tlf)
2770                 (sp->pp_tlf)(sp);
2771         else
2772                 (sp->pp_down)(sp);
2773 }
2774
2775 static void
2776 sppp_lcp_scr(struct sppp *sp)
2777 {
2778         char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2779         int i = 0;
2780         u_short authproto;
2781
2782         if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2783                 if (! sp->lcp.magic)
2784                         sp->lcp.magic = random();
2785                 opt[i++] = LCP_OPT_MAGIC;
2786                 opt[i++] = 6;
2787                 opt[i++] = sp->lcp.magic >> 24;
2788                 opt[i++] = sp->lcp.magic >> 16;
2789                 opt[i++] = sp->lcp.magic >> 8;
2790                 opt[i++] = sp->lcp.magic;
2791         }
2792
2793         if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2794                 opt[i++] = LCP_OPT_MRU;
2795                 opt[i++] = 4;
2796                 opt[i++] = sp->lcp.mru >> 8;
2797                 opt[i++] = sp->lcp.mru;
2798         }
2799
2800         if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2801                 authproto = sp->hisauth.proto;
2802                 opt[i++] = LCP_OPT_AUTH_PROTO;
2803                 opt[i++] = authproto == PPP_CHAP? 5: 4;
2804                 opt[i++] = authproto >> 8;
2805                 opt[i++] = authproto;
2806                 if (authproto == PPP_CHAP)
2807                         opt[i++] = CHAP_MD5;
2808         }
2809
2810         sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2811         sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2812 }
2813
2814 /*
2815  * Check the open NCPs, return true if at least one NCP is open.
2816  */
2817 static int
2818 sppp_ncp_check(struct sppp *sp)
2819 {
2820         int i, mask;
2821
2822         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2823                 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2824                         return 1;
2825         return 0;
2826 }
2827
2828 /*
2829  * Re-check the open NCPs and see if we should terminate the link.
2830  * Called by the NCPs during their tlf action handling.
2831  */
2832 static void
2833 sppp_lcp_check_and_close(struct sppp *sp)
2834 {
2835
2836         if (sp->pp_phase < PHASE_NETWORK)
2837                 /* don't bother, we are already going down */
2838                 return;
2839
2840         if (sppp_ncp_check(sp))
2841                 return;
2842
2843         lcp.Close(sp);
2844 }
2845
2846 /*
2847  *--------------------------------------------------------------------------*
2848  *                                                                          *
2849  *                        The IPCP implementation.                          *
2850  *                                                                          *
2851  *--------------------------------------------------------------------------*
2852  */
2853
2854 #ifdef INET
2855 static void
2856 sppp_ipcp_init(struct sppp *sp)
2857 {
2858         sp->ipcp.opts = 0;
2859         sp->ipcp.flags = 0;
2860         sp->state[IDX_IPCP] = STATE_INITIAL;
2861         sp->fail_counter[IDX_IPCP] = 0;
2862         sp->pp_seq[IDX_IPCP] = 0;
2863         sp->pp_rseq[IDX_IPCP] = 0;
2864         callout_init(&sp->ch[IDX_IPCP], CALLOUT_MPSAFE);
2865 }
2866
2867 static void
2868 sppp_ipcp_up(struct sppp *sp)
2869 {
2870         sppp_up_event(&ipcp, sp);
2871 }
2872
2873 static void
2874 sppp_ipcp_down(struct sppp *sp)
2875 {
2876         sppp_down_event(&ipcp, sp);
2877 }
2878
2879 static void
2880 sppp_ipcp_open(struct sppp *sp)
2881 {
2882         STDDCL;
2883         u_long myaddr, hisaddr;
2884
2885         sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
2886                             IPCP_MYADDR_DYN | IPCP_VJ);
2887         sp->ipcp.opts = 0;
2888
2889         sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2890         /*
2891          * If we don't have his address, this probably means our
2892          * interface doesn't want to talk IP at all.  (This could
2893          * be the case if somebody wants to speak only IPX, for
2894          * example.)  Don't open IPCP in this case.
2895          */
2896         if (hisaddr == 0L) {
2897                 /* XXX this message should go away */
2898                 if (debug)
2899                         log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2900                             SPP_ARGS(ifp));
2901                 return;
2902         }
2903         if (myaddr == 0L) {
2904                 /*
2905                  * I don't have an assigned address, so i need to
2906                  * negotiate my address.
2907                  */
2908                 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2909                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2910         } else
2911                 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2912         if (sp->confflags & CONF_ENABLE_VJ) {
2913                 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
2914                 sp->ipcp.max_state = MAX_STATES - 1;
2915                 sp->ipcp.compress_cid = 1;
2916         }
2917         sppp_open_event(&ipcp, sp);
2918 }
2919
2920 static void
2921 sppp_ipcp_close(struct sppp *sp)
2922 {
2923         sppp_close_event(&ipcp, sp);
2924         if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2925                 /*
2926                  * My address was dynamic, clear it again.
2927                  */
2928                 sppp_set_ip_addr(sp, 0L);
2929 }
2930
2931 static void
2932 sppp_ipcp_TO(void *cookie)
2933 {
2934         sppp_to_event(&ipcp, (struct sppp *)cookie);
2935 }
2936
2937 /*
2938  * Analyze a configure request.  Return true if it was agreeable, and
2939  * caused action sca, false if it has been rejected or nak'ed, and
2940  * caused action scn.  (The return value is used to make the state
2941  * transition decision in the state automaton.)
2942  */
2943 static int
2944 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2945 {
2946         u_char *buf, *r, *p;
2947         struct ifnet *ifp = SP2IFP(sp);
2948         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2949         u_long hisaddr, desiredaddr;
2950         int gotmyaddr = 0;
2951         int desiredcomp;
2952
2953         len -= 4;
2954         origlen = len;
2955         /*
2956          * Make sure to allocate a buf that can at least hold a
2957          * conf-nak with an `address' option.  We might need it below.
2958          */
2959         buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
2960         if (! buf)
2961                 return (0);
2962
2963         /* pass 1: see if we can recognize them */
2964         if (debug)
2965                 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2966                     SPP_ARGS(ifp));
2967         p = (void*) (h+1);
2968         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
2969             len-=p[1], p+=p[1]) {
2970                 if (debug)
2971                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
2972                 switch (*p) {
2973                 case IPCP_OPT_COMPRESSION:
2974                         if (!(sp->confflags & CONF_ENABLE_VJ)) {
2975                                 /* VJ compression administratively disabled */
2976                                 if (debug)
2977                                         log(-1, "[locally disabled] ");
2978                                 break;
2979                         }
2980                         /*
2981                          * In theory, we should only conf-rej an
2982                          * option that is shorter than RFC 1618
2983                          * requires (i.e. < 4), and should conf-nak
2984                          * anything else that is not VJ.  However,
2985                          * since our algorithm always uses the
2986                          * original option to NAK it with new values,
2987                          * things would become more complicated.  In
2988                          * pratice, the only commonly implemented IP
2989                          * compression option is VJ anyway, so the
2990                          * difference is negligible.
2991                          */
2992                         if (len >= 6 && p[1] == 6) {
2993                                 /*
2994                                  * correctly formed compression option
2995                                  * that could be VJ compression
2996                                  */
2997                                 continue;
2998                         }
2999                         if (debug)
3000                                 log(-1,
3001                                     "optlen %d [invalid/unsupported] ",
3002                                     p[1]);
3003                         break;
3004                 case IPCP_OPT_ADDRESS:
3005                         if (len >= 6 && p[1] == 6) {
3006                                 /* correctly formed address option */
3007                                 continue;
3008                         }
3009                         if (debug)
3010                                 log(-1, "[invalid] ");
3011                         break;
3012                 default:
3013                         /* Others not supported. */
3014                         if (debug)
3015                                 log(-1, "[rej] ");
3016                         break;
3017                 }
3018                 /* Add the option to rejected list. */
3019                 bcopy (p, r, p[1]);
3020                 r += p[1];
3021                 rlen += p[1];
3022         }
3023         if (rlen) {
3024                 if (debug)
3025                         log(-1, " send conf-rej\n");
3026                 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
3027                 return 0;
3028         } else if (debug)
3029                 log(-1, "\n");
3030
3031         /* pass 2: parse option values */
3032         sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
3033         if (debug)
3034                 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
3035                        SPP_ARGS(ifp));
3036         p = (void*) (h+1);
3037         len = origlen;
3038         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3039             len-=p[1], p+=p[1]) {
3040                 if (debug)
3041                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3042                 switch (*p) {
3043                 case IPCP_OPT_COMPRESSION:
3044                         desiredcomp = p[2] << 8 | p[3];
3045                         /* We only support VJ */
3046                         if (desiredcomp == IPCP_COMP_VJ) {
3047                                 if (debug)
3048                                         log(-1, "VJ [ack] ");
3049                                 sp->ipcp.flags |= IPCP_VJ;
3050                                 sl_compress_init(sp->pp_comp, p[4]);
3051                                 sp->ipcp.max_state = p[4];
3052                                 sp->ipcp.compress_cid = p[5];
3053                                 continue;
3054                         }
3055                         if (debug)
3056                                 log(-1,
3057                                     "compproto %#04x [not supported] ",
3058                                     desiredcomp);
3059                         p[2] = IPCP_COMP_VJ >> 8;
3060                         p[3] = IPCP_COMP_VJ;
3061                         p[4] = sp->ipcp.max_state;
3062                         p[5] = sp->ipcp.compress_cid;
3063                         break;
3064                 case IPCP_OPT_ADDRESS:
3065                         /* This is the address he wants in his end */
3066                         desiredaddr = p[2] << 24 | p[3] << 16 |
3067                                 p[4] << 8 | p[5];
3068                         if (desiredaddr == hisaddr ||
3069                             (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
3070                                 /*
3071                                  * Peer's address is same as our value,
3072                                  * or we have set it to 0.0.0.* to
3073                                  * indicate that we do not really care,
3074                                  * this is agreeable.  Gonna conf-ack
3075                                  * it.
3076                                  */
3077                                 if (debug)
3078                                         log(-1, "%s [ack] ",
3079                                                 sppp_dotted_quad(hisaddr));
3080                                 /* record that we've seen it already */
3081                                 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
3082                                 continue;
3083                         }
3084                         /*
3085                          * The address wasn't agreeable.  This is either
3086                          * he sent us 0.0.0.0, asking to assign him an
3087                          * address, or he send us another address not
3088                          * matching our value.  Either case, we gonna
3089                          * conf-nak it with our value.
3090                          * XXX: we should "rej" if hisaddr == 0
3091                          */
3092                         if (debug) {
3093                                 if (desiredaddr == 0)
3094                                         log(-1, "[addr requested] ");
3095                                 else
3096                                         log(-1, "%s [not agreed] ",
3097                                                 sppp_dotted_quad(desiredaddr));
3098
3099                         }
3100                         p[2] = hisaddr >> 24;
3101                         p[3] = hisaddr >> 16;
3102                         p[4] = hisaddr >> 8;
3103                         p[5] = hisaddr;
3104                         break;
3105                 }
3106                 /* Add the option to nak'ed list. */
3107                 bcopy (p, r, p[1]);
3108                 r += p[1];
3109                 rlen += p[1];
3110         }
3111
3112         /*
3113          * If we are about to conf-ack the request, but haven't seen
3114          * his address so far, gonna conf-nak it instead, with the
3115          * `address' option present and our idea of his address being
3116          * filled in there, to request negotiation of both addresses.
3117          *
3118          * XXX This can result in an endless req - nak loop if peer
3119          * doesn't want to send us his address.  Q: What should we do
3120          * about it?  XXX  A: implement the max-failure counter.
3121          */
3122         if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
3123                 buf[0] = IPCP_OPT_ADDRESS;
3124                 buf[1] = 6;
3125                 buf[2] = hisaddr >> 24;
3126                 buf[3] = hisaddr >> 16;
3127                 buf[4] = hisaddr >> 8;
3128                 buf[5] = hisaddr;
3129                 rlen = 6;
3130                 if (debug)
3131                         log(-1, "still need hisaddr ");
3132         }
3133
3134         if (rlen) {
3135                 if (debug)
3136                         log(-1, " send conf-nak\n");
3137                 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
3138         } else {
3139                 if (debug)
3140                         log(-1, " send conf-ack\n");
3141                 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
3142                               h->ident, origlen, h+1);
3143         }
3144
3145         free (buf, M_TEMP);
3146         return (rlen == 0);
3147 }
3148
3149 /*
3150  * Analyze the IPCP Configure-Reject option list, and adjust our
3151  * negotiation.
3152  */
3153 static void
3154 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3155 {
3156         u_char *buf, *p;
3157         struct ifnet *ifp = SP2IFP(sp);
3158         int debug = ifp->if_flags & IFF_DEBUG;
3159
3160         len -= 4;
3161         buf = malloc (len, M_TEMP, M_NOWAIT);
3162         if (!buf)
3163                 return;
3164
3165         if (debug)
3166                 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
3167                     SPP_ARGS(ifp));
3168
3169         p = (void*) (h+1);
3170         for (; len >= 2 && p[1] >= 2 && len >= p[1];
3171             len -= p[1], p += p[1]) {
3172                 if (debug)
3173                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3174                 switch (*p) {
3175                 case IPCP_OPT_COMPRESSION:
3176                         sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
3177                         break;
3178                 case IPCP_OPT_ADDRESS:
3179                         /*
3180                          * Peer doesn't grok address option.  This is
3181                          * bad.  XXX  Should we better give up here?
3182                          * XXX We could try old "addresses" option...
3183                          */
3184                         sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3185                         break;
3186                 }
3187         }
3188         if (debug)
3189                 log(-1, "\n");
3190         free (buf, M_TEMP);
3191         return;
3192 }
3193
3194 /*
3195  * Analyze the IPCP Configure-NAK option list, and adjust our
3196  * negotiation.
3197  */
3198 static void
3199 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3200 {
3201         u_char *buf, *p;
3202         struct ifnet *ifp = SP2IFP(sp);
3203         int debug = ifp->if_flags & IFF_DEBUG;
3204         int desiredcomp;
3205         u_long wantaddr;
3206
3207         len -= 4;
3208         buf = malloc (len, M_TEMP, M_NOWAIT);
3209         if (!buf)
3210                 return;
3211
3212         if (debug)
3213                 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
3214                     SPP_ARGS(ifp));
3215
3216         p = (void*) (h+1);
3217         for (; len >= 2 && p[1] >= 2 && len >= p[1];
3218             len -= p[1], p += p[1]) {
3219                 if (debug)
3220                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3221                 switch (*p) {
3222                 case IPCP_OPT_COMPRESSION:
3223                         if (len >= 6 && p[1] == 6) {
3224                                 desiredcomp = p[2] << 8 | p[3];
3225                                 if (debug)
3226                                         log(-1, "[wantcomp %#04x] ",
3227                                                 desiredcomp);
3228                                 if (desiredcomp == IPCP_COMP_VJ) {
3229                                         sl_compress_init(sp->pp_comp, p[4]);
3230                                         sp->ipcp.max_state = p[4];
3231                                         sp->ipcp.compress_cid = p[5];
3232                                         if (debug)
3233                                                 log(-1, "[agree] ");
3234                                 } else
3235                                         sp->ipcp.opts &=
3236                                                 ~(1 << IPCP_OPT_COMPRESSION);
3237                         }
3238                         break;
3239                 case IPCP_OPT_ADDRESS:
3240                         /*
3241                          * Peer doesn't like our local IP address.  See
3242                          * if we can do something for him.  We'll drop
3243                          * him our address then.
3244                          */
3245                         if (len >= 6 && p[1] == 6) {
3246                                 wantaddr = p[2] << 24 | p[3] << 16 |
3247                                         p[4] << 8 | p[5];
3248                                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3249                                 if (debug)
3250                                         log(-1, "[wantaddr %s] ",
3251                                                sppp_dotted_quad(wantaddr));
3252                                 /*
3253                                  * When doing dynamic address assignment,
3254                                  * we accept his offer.  Otherwise, we
3255                                  * ignore it and thus continue to negotiate
3256                                  * our already existing value.
3257                                  * XXX: Bogus, if he said no once, he'll
3258                                  * just say no again, might as well die.
3259                                  */
3260                                 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3261                                         sppp_set_ip_addr(sp, wantaddr);
3262                                         if (debug)
3263                                                 log(-1, "[agree] ");
3264                                         sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3265                                 }
3266                         }
3267                         break;
3268                 }
3269         }
3270         if (debug)
3271                 log(-1, "\n");
3272         free (buf, M_TEMP);
3273         return;
3274 }
3275
3276 static void
3277 sppp_ipcp_tlu(struct sppp *sp)
3278 {
3279         /* we are up - notify isdn daemon */
3280         if (sp->pp_con)
3281                 sp->pp_con(sp);
3282 }
3283
3284 static void
3285 sppp_ipcp_tld(struct sppp *sp)
3286 {
3287 }
3288
3289 static void
3290 sppp_ipcp_tls(struct sppp *sp)
3291 {
3292         /* indicate to LCP that it must stay alive */
3293         sp->lcp.protos |= (1 << IDX_IPCP);
3294 }
3295
3296 static void
3297 sppp_ipcp_tlf(struct sppp *sp)
3298 {
3299         /* we no longer need LCP */
3300         sp->lcp.protos &= ~(1 << IDX_IPCP);
3301         sppp_lcp_check_and_close(sp);
3302 }
3303
3304 static void
3305 sppp_ipcp_scr(struct sppp *sp)
3306 {
3307         char opt[6 /* compression */ + 6 /* address */];
3308         u_long ouraddr;
3309         int i = 0;
3310
3311         if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3312                 opt[i++] = IPCP_OPT_COMPRESSION;
3313                 opt[i++] = 6;
3314                 opt[i++] = IPCP_COMP_VJ >> 8;
3315                 opt[i++] = IPCP_COMP_VJ;
3316                 opt[i++] = sp->ipcp.max_state;
3317                 opt[i++] = sp->ipcp.compress_cid;
3318         }
3319         if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3320                 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3321                 opt[i++] = IPCP_OPT_ADDRESS;
3322                 opt[i++] = 6;
3323                 opt[i++] = ouraddr >> 24;
3324                 opt[i++] = ouraddr >> 16;
3325                 opt[i++] = ouraddr >> 8;
3326                 opt[i++] = ouraddr;
3327         }
3328
3329         sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3330         sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3331 }
3332 #else /* !INET */
3333 static void
3334 sppp_ipcp_init(struct sppp *sp)
3335 {
3336 }
3337
3338 static void
3339 sppp_ipcp_up(struct sppp *sp)
3340 {
3341 }
3342
3343 static void
3344 sppp_ipcp_down(struct sppp *sp)
3345 {
3346 }
3347
3348 static void
3349 sppp_ipcp_open(struct sppp *sp)
3350 {
3351 }
3352
3353 static void
3354 sppp_ipcp_close(struct sppp *sp)
3355 {
3356 }
3357
3358 static void
3359 sppp_ipcp_TO(void *cookie)
3360 {
3361 }
3362
3363 static int
3364 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3365 {
3366         return (0);
3367 }
3368
3369 static void
3370 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3371 {
3372 }
3373
3374 static void
3375 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3376 {
3377 }
3378
3379 static void
3380 sppp_ipcp_tlu(struct sppp *sp)
3381 {
3382 }
3383
3384 static void
3385 sppp_ipcp_tld(struct sppp *sp)
3386 {
3387 }
3388
3389 static void
3390 sppp_ipcp_tls(struct sppp *sp)
3391 {
3392 }
3393
3394 static void
3395 sppp_ipcp_tlf(struct sppp *sp)
3396 {
3397 }
3398
3399 static void
3400 sppp_ipcp_scr(struct sppp *sp)
3401 {
3402 }
3403 #endif
3404
3405 /*
3406  *--------------------------------------------------------------------------*
3407  *                                                                          *
3408  *                      The IPv6CP implementation.                          *
3409  *                                                                          *
3410  *--------------------------------------------------------------------------*
3411  */
3412
3413 #ifdef INET6
3414 static void
3415 sppp_ipv6cp_init(struct sppp *sp)
3416 {
3417         sp->ipv6cp.opts = 0;
3418         sp->ipv6cp.flags = 0;
3419         sp->state[IDX_IPV6CP] = STATE_INITIAL;
3420         sp->fail_counter[IDX_IPV6CP] = 0;
3421         sp->pp_seq[IDX_IPV6CP] = 0;
3422         sp->pp_rseq[IDX_IPV6CP] = 0;
3423         callout_init(&sp->ch[IDX_IPV6CP], CALLOUT_MPSAFE);
3424 }
3425
3426 static void
3427 sppp_ipv6cp_up(struct sppp *sp)
3428 {
3429         sppp_up_event(&ipv6cp, sp);
3430 }
3431
3432 static void
3433 sppp_ipv6cp_down(struct sppp *sp)
3434 {
3435         sppp_down_event(&ipv6cp, sp);
3436 }
3437
3438 static void
3439 sppp_ipv6cp_open(struct sppp *sp)
3440 {
3441         STDDCL;
3442         struct in6_addr myaddr, hisaddr;
3443
3444 #ifdef IPV6CP_MYIFID_DYN
3445         sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3446 #else
3447         sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3448 #endif
3449
3450         sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3451         /*
3452          * If we don't have our address, this probably means our
3453          * interface doesn't want to talk IPv6 at all.  (This could
3454          * be the case if somebody wants to speak only IPX, for
3455          * example.)  Don't open IPv6CP in this case.
3456          */
3457         if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3458                 /* XXX this message should go away */
3459                 if (debug)
3460                         log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
3461                             SPP_ARGS(ifp));
3462                 return;
3463         }
3464
3465         sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3466         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3467         sppp_open_event(&ipv6cp, sp);
3468 }
3469
3470 static void
3471 sppp_ipv6cp_close(struct sppp *sp)
3472 {
3473         sppp_close_event(&ipv6cp, sp);
3474 }
3475
3476 static void
3477 sppp_ipv6cp_TO(void *cookie)
3478 {
3479         sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3480 }
3481
3482 /*
3483  * Analyze a configure request.  Return true if it was agreeable, and
3484  * caused action sca, false if it has been rejected or nak'ed, and
3485  * caused action scn.  (The return value is used to make the state
3486  * transition decision in the state automaton.)
3487  */
3488 static int
3489 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3490 {
3491         u_char *buf, *r, *p;
3492         struct ifnet *ifp = SP2IFP(sp);
3493         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3494         struct in6_addr myaddr, desiredaddr, suggestaddr;
3495         int ifidcount;
3496         int type;
3497         int collision, nohisaddr;
3498         char ip6buf[INET6_ADDRSTRLEN];
3499
3500         len -= 4;
3501         origlen = len;
3502         /*
3503          * Make sure to allocate a buf that can at least hold a
3504          * conf-nak with an `address' option.  We might need it below.
3505          */
3506         buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
3507         if (! buf)
3508                 return (0);
3509
3510         /* pass 1: see if we can recognize them */
3511         if (debug)
3512                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
3513                     SPP_ARGS(ifp));
3514         p = (void*) (h+1);
3515         ifidcount = 0;
3516         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3517             len-=p[1], p+=p[1]) {
3518                 if (debug)
3519                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3520                 switch (*p) {
3521                 case IPV6CP_OPT_IFID:
3522                         if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3523                                 /* correctly formed address option */
3524                                 ifidcount++;
3525                                 continue;
3526                         }
3527                         if (debug)
3528                                 log(-1, " [invalid]");
3529                         break;
3530 #ifdef notyet
3531                 case IPV6CP_OPT_COMPRESSION:
3532                         if (len >= 4 && p[1] >= 4) {
3533                                 /* correctly formed compress option */
3534                                 continue;
3535                         }
3536                         if (debug)
3537                                 log(-1, " [invalid]");
3538                         break;
3539 #endif
3540                 default:
3541                         /* Others not supported. */
3542                         if (debug)
3543                                 log(-1, " [rej]");
3544                         break;
3545                 }
3546                 /* Add the option to rejected list. */
3547                 bcopy (p, r, p[1]);
3548                 r += p[1];
3549                 rlen += p[1];
3550         }
3551         if (rlen) {
3552                 if (debug)
3553                         log(-1, " send conf-rej\n");
3554                 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3555                 goto end;
3556         } else if (debug)
3557                 log(-1, "\n");
3558
3559         /* pass 2: parse option values */
3560         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3561         if (debug)
3562                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
3563                     SPP_ARGS(ifp));
3564         p = (void*) (h+1);
3565         len = origlen;
3566         type = CONF_ACK;
3567         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
3568             len-=p[1], p+=p[1]) {
3569                 if (debug)
3570                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3571                 switch (*p) {
3572 #ifdef notyet
3573                 case IPV6CP_OPT_COMPRESSION:
3574                         continue;
3575 #endif
3576                 case IPV6CP_OPT_IFID:
3577                         bzero(&desiredaddr, sizeof(desiredaddr));
3578                         bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3579                         collision = (bcmp(&desiredaddr.s6_addr[8],
3580                                           &myaddr.s6_addr[8], 8) == 0);
3581                         nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3582
3583                         desiredaddr.s6_addr16[0] = htons(0xfe80);
3584                         (void)in6_setscope(&desiredaddr, SP2IFP(sp), NULL);
3585
3586                         if (!collision && !nohisaddr) {
3587                                 /* no collision, hisaddr known - Conf-Ack */
3588                                 type = CONF_ACK;
3589
3590                                 if (debug) {
3591                                         log(-1, " %s [%s]",
3592                                             ip6_sprintf(ip6buf, &desiredaddr),
3593                                             sppp_cp_type_name(type));
3594                                 }
3595                                 continue;
3596                         }
3597
3598                         bzero(&suggestaddr, sizeof(suggestaddr));
3599                         if (collision && nohisaddr) {
3600                                 /* collision, hisaddr unknown - Conf-Rej */
3601                                 type = CONF_REJ;
3602                                 bzero(&p[2], 8);
3603                         } else {
3604                                 /*
3605                                  * - no collision, hisaddr unknown, or
3606                                  * - collision, hisaddr known
3607                                  * Conf-Nak, suggest hisaddr
3608                                  */
3609                                 type = CONF_NAK;
3610                                 sppp_suggest_ip6_addr(sp, &suggestaddr);
3611                                 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3612                         }
3613                         if (debug)
3614                                 log(-1, " %s [%s]",
3615                                     ip6_sprintf(ip6buf, &desiredaddr),
3616                                     sppp_cp_type_name(type));
3617                         break;
3618                 }
3619                 /* Add the option to nak'ed list. */
3620                 bcopy (p, r, p[1]);
3621                 r += p[1];
3622                 rlen += p[1];
3623         }
3624
3625         if (rlen == 0 && type == CONF_ACK) {
3626                 if (debug)
3627                         log(-1, " send %s\n", sppp_cp_type_name(type));
3628                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
3629         } else {
3630 #ifdef DIAGNOSTIC
3631                 if (type == CONF_ACK)
3632                         panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3633 #endif
3634
3635                 if (debug) {
3636                         log(-1, " send %s suggest %s\n",
3637                             sppp_cp_type_name(type),
3638                             ip6_sprintf(ip6buf, &suggestaddr));
3639                 }
3640                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3641         }
3642
3643  end:
3644         free (buf, M_TEMP);
3645         return (rlen == 0);
3646 }
3647
3648 /*
3649  * Analyze the IPv6CP Configure-Reject option list, and adjust our
3650  * negotiation.
3651  */
3652 static void
3653 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3654 {
3655         u_char *buf, *p;
3656         struct ifnet *ifp = SP2IFP(sp);
3657         int debug = ifp->if_flags & IFF_DEBUG;
3658
3659         len -= 4;
3660         buf = malloc (len, M_TEMP, M_NOWAIT);
3661         if (!buf)
3662                 return;
3663
3664         if (debug)
3665                 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
3666                     SPP_ARGS(ifp));
3667
3668         p = (void*) (h+1);
3669         for (; len >= 2 && p[1] >= 2 && len >= p[1];
3670             len -= p[1], p += p[1]) {
3671                 if (debug)
3672                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3673                 switch (*p) {
3674                 case IPV6CP_OPT_IFID:
3675                         /*
3676                          * Peer doesn't grok address option.  This is
3677                          * bad.  XXX  Should we better give up here?
3678                          */
3679                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3680                         break;
3681 #ifdef notyet
3682                 case IPV6CP_OPT_COMPRESS:
3683                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3684                         break;
3685 #endif
3686                 }
3687         }
3688         if (debug)
3689                 log(-1, "\n");
3690         free (buf, M_TEMP);
3691         return;
3692 }
3693
3694 /*
3695  * Analyze the IPv6CP Configure-NAK option list, and adjust our
3696  * negotiation.
3697  */
3698 static void
3699 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3700 {
3701         u_char *buf, *p;
3702         struct ifnet *ifp = SP2IFP(sp);
3703         int debug = ifp->if_flags & IFF_DEBUG;
3704         struct in6_addr suggestaddr;
3705         char ip6buf[INET6_ADDRSTRLEN];
3706
3707         len -= 4;
3708         buf = malloc (len, M_TEMP, M_NOWAIT);
3709         if (!buf)
3710                 return;
3711
3712         if (debug)
3713                 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:",
3714                     SPP_ARGS(ifp));
3715
3716         p = (void*) (h+1);
3717         for (; len >= 2 && p[1] >= 2 && len >= p[1];
3718             len -= p[1], p += p[1]) {
3719                 if (debug)
3720                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3721                 switch (*p) {
3722                 case IPV6CP_OPT_IFID:
3723                         /*
3724                          * Peer doesn't like our local ifid.  See
3725                          * if we can do something for him.  We'll drop
3726                          * him our address then.
3727                          */
3728                         if (len < 10 || p[1] != 10)
3729                                 break;
3730                         bzero(&suggestaddr, sizeof(suggestaddr));
3731                         suggestaddr.s6_addr16[0] = htons(0xfe80);
3732                         (void)in6_setscope(&suggestaddr, SP2IFP(sp), NULL);
3733                         bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3734
3735                         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3736                         if (debug)
3737                                 log(-1, " [suggestaddr %s]",
3738                                        ip6_sprintf(ip6buf, &suggestaddr));
3739 #ifdef IPV6CP_MYIFID_DYN
3740                         /*
3741                          * When doing dynamic address assignment,
3742                          * we accept his offer.
3743                          */
3744                         if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3745                                 struct in6_addr lastsuggest;
3746                                 /*
3747                                  * If <suggested myaddr from peer> equals to
3748                                  * <hisaddr we have suggested last time>,
3749                                  * we have a collision.  generate new random
3750                                  * ifid.
3751                                  */
3752                                 sppp_suggest_ip6_addr(&lastsuggest);
3753                                 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
3754                                                        lastsuggest)) {
3755                                         if (debug)
3756                                                 log(-1, " [random]");
3757                                         sppp_gen_ip6_addr(sp, &suggestaddr);
3758                                 }
3759                                 sppp_set_ip6_addr(sp, &suggestaddr, 0);
3760                                 if (debug)
3761                                         log(-1, " [agree]");
3762                                 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3763                         }
3764 #else
3765                         /*
3766                          * Since we do not do dynamic address assignment,
3767                          * we ignore it and thus continue to negotiate
3768                          * our already existing value.  This can possibly
3769                          * go into infinite request-reject loop.
3770                          *
3771                          * This is not likely because we normally use
3772                          * ifid based on MAC-address.
3773                          * If you have no ethernet card on the node, too bad.
3774                          * XXX should we use fail_counter?
3775                          */
3776 #endif
3777                         break;
3778 #ifdef notyet
3779                 case IPV6CP_OPT_COMPRESS:
3780                         /*
3781                          * Peer wants different compression parameters.
3782                          */
3783                         break;
3784 #endif
3785                 }
3786         }
3787         if (debug)
3788                 log(-1, "\n");
3789         free (buf, M_TEMP);
3790         return;
3791 }
3792 static void
3793 sppp_ipv6cp_tlu(struct sppp *sp)
3794 {
3795         /* we are up - notify isdn daemon */
3796         if (sp->pp_con)
3797                 sp->pp_con(sp);
3798 }
3799
3800 static void
3801 sppp_ipv6cp_tld(struct sppp *sp)
3802 {
3803 }
3804
3805 static void
3806 sppp_ipv6cp_tls(struct sppp *sp)
3807 {
3808         /* indicate to LCP that it must stay alive */
3809         sp->lcp.protos |= (1 << IDX_IPV6CP);
3810 }
3811
3812 static void
3813 sppp_ipv6cp_tlf(struct sppp *sp)
3814 {
3815
3816 #if 0   /* need #if 0 to close IPv6CP properly */
3817         /* we no longer need LCP */
3818         sp->lcp.protos &= ~(1 << IDX_IPV6CP);
3819         sppp_lcp_check_and_close(sp);
3820 #endif
3821 }
3822
3823 static void
3824 sppp_ipv6cp_scr(struct sppp *sp)
3825 {
3826         char opt[10 /* ifid */ + 4 /* compression, minimum */];
3827         struct in6_addr ouraddr;
3828         int i = 0;
3829
3830         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
3831                 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
3832                 opt[i++] = IPV6CP_OPT_IFID;
3833                 opt[i++] = 10;
3834                 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
3835                 i += 8;
3836         }
3837
3838 #ifdef notyet
3839         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
3840                 opt[i++] = IPV6CP_OPT_COMPRESSION;
3841                 opt[i++] = 4;
3842                 opt[i++] = 0;   /* TBD */
3843                 opt[i++] = 0;   /* TBD */
3844                 /* variable length data may follow */
3845         }
3846 #endif
3847
3848         sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
3849         sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt);
3850 }
3851 #else /*INET6*/
3852 static void sppp_ipv6cp_init(struct sppp *sp)
3853 {
3854 }
3855
3856 static void sppp_ipv6cp_up(struct sppp *sp)
3857 {
3858 }
3859
3860 static void sppp_ipv6cp_down(struct sppp *sp)
3861 {
3862 }
3863
3864
3865 static void sppp_ipv6cp_open(struct sppp *sp)
3866 {
3867 }
3868
3869 static void sppp_ipv6cp_close(struct sppp *sp)
3870 {
3871 }
3872
3873 static void sppp_ipv6cp_TO(void *sp)
3874 {
3875 }
3876
3877 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3878 {
3879         return 0;
3880 }
3881
3882 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3883 {
3884 }
3885
3886 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3887 {
3888 }
3889
3890 static void sppp_ipv6cp_tlu(struct sppp *sp)
3891 {
3892 }
3893
3894 static void sppp_ipv6cp_tld(struct sppp *sp)
3895 {
3896 }
3897
3898 static void sppp_ipv6cp_tls(struct sppp *sp)
3899 {
3900 }
3901
3902 static void sppp_ipv6cp_tlf(struct sppp *sp)
3903 {
3904 }
3905
3906 static void sppp_ipv6cp_scr(struct sppp *sp)
3907 {
3908 }
3909 #endif /*INET6*/
3910
3911 /*
3912  *--------------------------------------------------------------------------*
3913  *                                                                          *
3914  *                        The CHAP implementation.                          *
3915  *                                                                          *
3916  *--------------------------------------------------------------------------*
3917  */
3918
3919 /*
3920  * The authentication protocols don't employ a full-fledged state machine as
3921  * the control protocols do, since they do have Open and Close events, but
3922  * not Up and Down, nor are they explicitly terminated.  Also, use of the
3923  * authentication protocols may be different in both directions (this makes
3924  * sense, think of a machine that never accepts incoming calls but only
3925  * calls out, it doesn't require the called party to authenticate itself).
3926  *
3927  * Our state machine for the local authentication protocol (we are requesting
3928  * the peer to authenticate) looks like:
3929  *
3930  *                                                  RCA-
3931  *            +--------------------------------------------+
3932  *            V                                     scn,tld|
3933  *        +--------+                           Close   +---------+ RCA+
3934  *        |        |<----------------------------------|         |------+
3935  *   +--->| Closed |                            TO*    | Opened  | sca  |
3936  *   |    |        |-----+                     +-------|         |<-----+
3937  *   |    +--------+ irc |                     |       +---------+
3938  *   |      ^            |                     |           ^
3939  *   |      |            |                     |           |
3940  *   |      |            |                     |           |
3941  *   |   TO-|            |                     |           |
3942  *   |      |tld  TO+    V                     |           |
3943  *   |      |   +------->+                     |           |
3944  *   |      |   |        |                     |           |
3945  *   |    +--------+     V                     |           |
3946  *   |    |        |<----+<--------------------+           |
3947  *   |    | Req-   | scr                                   |
3948  *   |    | Sent   |                                       |
3949  *   |    |        |                                       |
3950  *   |    +--------+                                       |
3951  *   | RCA- |   | RCA+                                     |
3952  *   +------+   +------------------------------------------+
3953  *   scn,tld      sca,irc,ict,tlu
3954  *
3955  *
3956  *   with:
3957  *
3958  *      Open:   LCP reached authentication phase
3959  *      Close:  LCP reached terminate phase
3960  *
3961  *      RCA+:   received reply (pap-req, chap-response), acceptable
3962  *      RCN:    received reply (pap-req, chap-response), not acceptable
3963  *      TO+:    timeout with restart counter >= 0
3964  *      TO-:    timeout with restart counter < 0
3965  *      TO*:    reschedule timeout for CHAP
3966  *
3967  *      scr:    send request packet (none for PAP, chap-challenge)
3968  *      sca:    send ack packet (pap-ack, chap-success)
3969  *      scn:    send nak packet (pap-nak, chap-failure)
3970  *      ict:    initialize re-challenge timer (CHAP only)
3971  *
3972  *      tlu:    this-layer-up, LCP reaches network phase
3973  *      tld:    this-layer-down, LCP enters terminate phase
3974  *
3975  * Note that in CHAP mode, after sending a new challenge, while the state
3976  * automaton falls back into Req-Sent state, it doesn't signal a tld
3977  * event to LCP, so LCP remains in network phase.  Only after not getting
3978  * any response (or after getting an unacceptable response), CHAP closes,
3979  * causing LCP to enter terminate phase.
3980  *
3981  * With PAP, there is no initial request that can be sent.  The peer is
3982  * expected to send one based on the successful negotiation of PAP as
3983  * the authentication protocol during the LCP option negotiation.
3984  *
3985  * Incoming authentication protocol requests (remote requests
3986  * authentication, we are peer) don't employ a state machine at all,
3987  * they are simply answered.  Some peers [Ascend P50 firmware rev
3988  * 4.50] react allergically when sending IPCP requests while they are
3989  * still in authentication phase (thereby violating the standard that
3990  * demands that these NCP packets are to be discarded), so we keep
3991  * track of the peer demanding us to authenticate, and only proceed to
3992  * phase network once we've seen a positive acknowledge for the
3993  * authentication.
3994  */
3995
3996 /*
3997  * Handle incoming CHAP packets.
3998  */
3999 static void
4000 sppp_chap_input(struct sppp *sp, struct mbuf *m)
4001 {
4002         STDDCL;
4003         struct lcp_header *h;
4004         int len;
4005         u_char *value, *name, digest[AUTHKEYLEN], dsize;
4006         int value_len, name_len;
4007         MD5_CTX ctx;
4008
4009         len = m->m_pkthdr.len;
4010         if (len < 4) {
4011                 if (debug)
4012                         log(LOG_DEBUG,
4013                             SPP_FMT "chap invalid packet length: %d bytes\n",
4014                             SPP_ARGS(ifp), len);
4015                 return;
4016         }
4017         h = mtod (m, struct lcp_header*);
4018         if (len > ntohs (h->len))
4019                 len = ntohs (h->len);
4020
4021         switch (h->type) {
4022         /* challenge, failure and success are his authproto */
4023         case CHAP_CHALLENGE:
4024                 value = 1 + (u_char*)(h+1);
4025                 value_len = value[-1];
4026                 name = value + value_len;
4027                 name_len = len - value_len - 5;
4028                 if (name_len < 0) {
4029                         if (debug) {
4030                                 log(LOG_DEBUG,
4031                                     SPP_FMT "chap corrupted challenge "
4032                                     "<%s id=0x%x len=%d",
4033                                     SPP_ARGS(ifp),
4034                                     sppp_auth_type_name(PPP_CHAP, h->type),
4035                                     h->ident, ntohs(h->len));
4036                                 sppp_print_bytes((u_char*) (h+1), len-4);
4037                                 log(-1, ">\n");
4038                         }
4039                         break;
4040                 }
4041
4042                 if (debug) {
4043                         log(LOG_DEBUG,
4044                             SPP_FMT "chap input <%s id=0x%x len=%d name=",
4045                             SPP_ARGS(ifp),
4046                             sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
4047                             ntohs(h->len));
4048                         sppp_print_string((char*) name, name_len);
4049                         log(-1, " value-size=%d value=", value_len);
4050                         sppp_print_bytes(value, value_len);
4051                         log(-1, ">\n");
4052                 }
4053
4054                 /* Compute reply value. */
4055                 MD5Init(&ctx);
4056                 MD5Update(&ctx, &h->ident, 1);
4057                 MD5Update(&ctx, sp->myauth.secret,
4058                           sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
4059                 MD5Update(&ctx, value, value_len);
4060                 MD5Final(digest, &ctx);
4061                 dsize = sizeof digest;
4062
4063                 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
4064                                sizeof dsize, (const char *)&dsize,
4065                                sizeof digest, digest,
4066                                (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4067                                sp->myauth.name,
4068                                0);
4069                 break;
4070
4071         case CHAP_SUCCESS:
4072                 if (debug) {
4073                         log(LOG_DEBUG, SPP_FMT "chap success",
4074                             SPP_ARGS(ifp));
4075                         if (len > 4) {
4076                                 log(-1, ": ");
4077                                 sppp_print_string((char*)(h + 1), len - 4);
4078                         }
4079                         log(-1, "\n");
4080                 }
4081                 SPPP_LOCK(sp);
4082                 sp->pp_flags &= ~PP_NEEDAUTH;
4083                 if (sp->myauth.proto == PPP_CHAP &&
4084                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4085                     (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
4086                         /*
4087                          * We are authenticator for CHAP but didn't
4088                          * complete yet.  Leave it to tlu to proceed
4089                          * to network phase.
4090                          */
4091                         SPPP_UNLOCK(sp);
4092                         break;
4093                 }
4094                 SPPP_UNLOCK(sp);
4095                 sppp_phase_network(sp);
4096                 break;
4097
4098         case CHAP_FAILURE:
4099                 if (debug) {
4100                         log(LOG_INFO, SPP_FMT "chap failure",
4101                             SPP_ARGS(ifp));
4102                         if (len > 4) {
4103                                 log(-1, ": ");
4104                                 sppp_print_string((char*)(h + 1), len - 4);
4105                         }
4106                         log(-1, "\n");
4107                 } else
4108                         log(LOG_INFO, SPP_FMT "chap failure\n",
4109                             SPP_ARGS(ifp));
4110                 /* await LCP shutdown by authenticator */
4111                 break;
4112
4113         /* response is my authproto */
4114         case CHAP_RESPONSE:
4115                 value = 1 + (u_char*)(h+1);
4116                 value_len = value[-1];
4117                 name = value + value_len;
4118                 name_len = len - value_len - 5;
4119                 if (name_len < 0) {
4120                         if (debug) {
4121                                 log(LOG_DEBUG,
4122                                     SPP_FMT "chap corrupted response "
4123                                     "<%s id=0x%x len=%d",
4124                                     SPP_ARGS(ifp),
4125                                     sppp_auth_type_name(PPP_CHAP, h->type),
4126                                     h->ident, ntohs(h->len));
4127                                 sppp_print_bytes((u_char*)(h+1), len-4);
4128                                 log(-1, ">\n");
4129                         }
4130                         break;
4131                 }
4132                 if (h->ident != sp->confid[IDX_CHAP]) {
4133                         if (debug)
4134                                 log(LOG_DEBUG,
4135                                     SPP_FMT "chap dropping response for old ID "
4136                                     "(got %d, expected %d)\n",
4137                                     SPP_ARGS(ifp),
4138                                     h->ident, sp->confid[IDX_CHAP]);
4139                         break;
4140                 }
4141                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
4142                     || bcmp(name, sp->hisauth.name, name_len) != 0) {
4143                         log(LOG_INFO, SPP_FMT "chap response, his name ",
4144                             SPP_ARGS(ifp));
4145                         sppp_print_string(name, name_len);
4146                         log(-1, " != expected ");
4147                         sppp_print_string(sp->hisauth.name,
4148                                           sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
4149                         log(-1, "\n");
4150                 }
4151                 if (debug) {
4152                         log(LOG_DEBUG, SPP_FMT "chap input(%s) "
4153                             "<%s id=0x%x len=%d name=",
4154                             SPP_ARGS(ifp),
4155                             sppp_state_name(sp->state[IDX_CHAP]),
4156                             sppp_auth_type_name(PPP_CHAP, h->type),
4157                             h->ident, ntohs (h->len));
4158                         sppp_print_string((char*)name, name_len);
4159                         log(-1, " value-size=%d value=", value_len);
4160                         sppp_print_bytes(value, value_len);
4161                         log(-1, ">\n");
4162                 }
4163                 if (value_len != AUTHKEYLEN) {
4164                         if (debug)
4165                                 log(LOG_DEBUG,
4166                                     SPP_FMT "chap bad hash value length: "
4167                                     "%d bytes, should be %d\n",
4168                                     SPP_ARGS(ifp), value_len,
4169                                     AUTHKEYLEN);
4170                         break;
4171                 }
4172
4173                 MD5Init(&ctx);
4174                 MD5Update(&ctx, &h->ident, 1);
4175                 MD5Update(&ctx, sp->hisauth.secret,
4176                           sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
4177                 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
4178                 MD5Final(digest, &ctx);
4179
4180 #define FAILMSG "Failed..."
4181 #define SUCCMSG "Welcome!"
4182
4183                 if (value_len != sizeof digest ||
4184                     bcmp(digest, value, value_len) != 0) {
4185                         /* action scn, tld */
4186                         sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
4187                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4188                                        0);
4189                         chap.tld(sp);
4190                         break;
4191                 }
4192                 /* action sca, perhaps tlu */
4193                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
4194                     sp->state[IDX_CHAP] == STATE_OPENED)
4195                         sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
4196                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4197                                        0);
4198                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
4199                         sppp_cp_change_state(&chap, sp, STATE_OPENED);
4200                         chap.tlu(sp);
4201                 }
4202                 break;
4203
4204         default:
4205                 /* Unknown CHAP packet type -- ignore. */
4206                 if (debug) {
4207                         log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
4208                             "<0x%x id=0x%xh len=%d",
4209                             SPP_ARGS(ifp),
4210                             sppp_state_name(sp->state[IDX_CHAP]),
4211                             h->type, h->ident, ntohs(h->len));
4212                         sppp_print_bytes((u_char*)(h+1), len-4);
4213                         log(-1, ">\n");
4214                 }
4215                 break;
4216
4217         }
4218 }
4219
4220 static void
4221 sppp_chap_init(struct sppp *sp)
4222 {
4223         /* Chap doesn't have STATE_INITIAL at all. */
4224         sp->state[IDX_CHAP] = STATE_CLOSED;
4225         sp->fail_counter[IDX_CHAP] = 0;
4226         sp->pp_seq[IDX_CHAP] = 0;
4227         sp->pp_rseq[IDX_CHAP] = 0;
4228         callout_init(&sp->ch[IDX_CHAP], CALLOUT_MPSAFE);
4229 }
4230
4231 static void
4232 sppp_chap_open(struct sppp *sp)
4233 {
4234         if (sp->myauth.proto == PPP_CHAP &&
4235             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4236                 /* we are authenticator for CHAP, start it */
4237                 chap.scr(sp);
4238                 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4239                 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4240         }
4241         /* nothing to be done if we are peer, await a challenge */
4242 }
4243
4244 static void
4245 sppp_chap_close(struct sppp *sp)
4246 {
4247         if (sp->state[IDX_CHAP] != STATE_CLOSED)
4248                 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4249 }
4250
4251 static void
4252 sppp_chap_TO(void *cookie)
4253 {
4254         struct sppp *sp = (struct sppp *)cookie;
4255         STDDCL;
4256
4257         SPPP_LOCK(sp);
4258         if (debug)
4259                 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
4260                     SPP_ARGS(ifp),
4261                     sppp_state_name(sp->state[IDX_CHAP]),
4262                     sp->rst_counter[IDX_CHAP]);
4263
4264         if (--sp->rst_counter[IDX_CHAP] < 0)
4265                 /* TO- event */
4266                 switch (sp->state[IDX_CHAP]) {
4267                 case STATE_REQ_SENT:
4268                         chap.tld(sp);
4269                         sppp_cp_change_state(&chap, sp, STATE_CLOSED);
4270                         break;
4271                 }
4272         else
4273                 /* TO+ (or TO*) event */
4274                 switch (sp->state[IDX_CHAP]) {
4275                 case STATE_OPENED:
4276                         /* TO* event */
4277                         sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4278                         /* FALLTHROUGH */
4279                 case STATE_REQ_SENT:
4280                         chap.scr(sp);
4281                         /* sppp_cp_change_state() will restart the timer */
4282                         sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
4283                         break;
4284                 }
4285
4286         SPPP_UNLOCK(sp);
4287 }
4288
4289 static void
4290 sppp_chap_tlu(struct sppp *sp)
4291 {
4292         STDDCL;
4293         int i;
4294
4295         i = 0;
4296         sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
4297
4298         /*
4299          * Some broken CHAP implementations (Conware CoNet, firmware
4300          * 4.0.?) don't want to re-authenticate their CHAP once the
4301          * initial challenge-response exchange has taken place.
4302          * Provide for an option to avoid rechallenges.
4303          */
4304         if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
4305                 /*
4306                  * Compute the re-challenge timeout.  This will yield
4307                  * a number between 300 and 810 seconds.
4308                  */
4309                 i = 300 + ((unsigned)(random() & 0xff00) >> 7);
4310                 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, (void *)sp);
4311         }
4312
4313         if (debug) {
4314                 log(LOG_DEBUG,
4315                     SPP_FMT "chap %s, ",
4316                     SPP_ARGS(ifp),
4317                     sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
4318                 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
4319                         log(-1, "next re-challenge in %d seconds\n", i);
4320                 else
4321                         log(-1, "re-challenging supressed\n");
4322         }
4323
4324         SPPP_LOCK(sp);
4325         /* indicate to LCP that we need to be closed down */
4326         sp->lcp.protos |= (1 << IDX_CHAP);
4327
4328         if (sp->pp_flags & PP_NEEDAUTH) {
4329                 /*
4330                  * Remote is authenticator, but his auth proto didn't
4331                  * complete yet.  Defer the transition to network
4332                  * phase.
4333                  */
4334                 SPPP_UNLOCK(sp);
4335                 return;
4336         }
4337         SPPP_UNLOCK(sp);
4338
4339         /*
4340          * If we are already in phase network, we are done here.  This
4341          * is the case if this is a dummy tlu event after a re-challenge.
4342          */
4343         if (sp->pp_phase != PHASE_NETWORK)
4344                 sppp_phase_network(sp);
4345 }
4346
4347 static void
4348 sppp_chap_tld(struct sppp *sp)
4349 {
4350         STDDCL;
4351
4352         if (debug)
4353                 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
4354         callout_stop(&sp->ch[IDX_CHAP]);
4355         sp->lcp.protos &= ~(1 << IDX_CHAP);
4356
4357         lcp.Close(sp);
4358 }
4359
4360 static void
4361 sppp_chap_scr(struct sppp *sp)
4362 {
4363         u_long *ch, seed;
4364         u_char clen;
4365
4366         /* Compute random challenge. */
4367         ch = (u_long *)sp->myauth.challenge;
4368         read_random(&seed, sizeof seed);
4369         ch[0] = seed ^ random();
4370         ch[1] = seed ^ random();
4371         ch[2] = seed ^ random();
4372         ch[3] = seed ^ random();
4373         clen = AUTHKEYLEN;
4374
4375         sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP];
4376
4377         sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
4378                        sizeof clen, (const char *)&clen,
4379                        (size_t)AUTHKEYLEN, sp->myauth.challenge,
4380                        (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
4381                        sp->myauth.name,
4382                        0);
4383 }
4384
4385 /*
4386  *--------------------------------------------------------------------------*
4387  *                                                                          *
4388  *                        The PAP implementation.                           *
4389  *                                                                          *
4390  *--------------------------------------------------------------------------*
4391  */
4392 /*
4393  * For PAP, we need to keep a little state also if we are the peer, not the
4394  * authenticator.  This is since we don't get a request to authenticate, but
4395  * have to repeatedly authenticate ourself until we got a response (or the
4396  * retry counter is expired).
4397  */
4398
4399 /*
4400  * Handle incoming PAP packets.  */
4401 static void
4402 sppp_pap_input(struct sppp *sp, struct mbuf *m)
4403 {
4404         STDDCL;
4405         struct lcp_header *h;
4406         int len;
4407         u_char *name, *passwd, mlen;
4408         int name_len, passwd_len;
4409
4410         len = m->m_pkthdr.len;
4411         if (len < 5) {
4412                 if (debug)
4413                         log(LOG_DEBUG,
4414                             SPP_FMT "pap invalid packet length: %d bytes\n",
4415                             SPP_ARGS(ifp), len);
4416                 return;
4417         }
4418         h = mtod (m, struct lcp_header*);
4419         if (len > ntohs (h->len))
4420                 len = ntohs (h->len);
4421         switch (h->type) {
4422         /* PAP request is my authproto */
4423         case PAP_REQ:
4424                 name = 1 + (u_char*)(h+1);
4425                 name_len = name[-1];
4426                 passwd = name + name_len + 1;
4427                 if (name_len > len - 6 ||
4428                     (passwd_len = passwd[-1]) > len - 6 - name_len) {
4429                         if (debug) {
4430                                 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4431                                     "<%s id=0x%x len=%d",
4432                                     SPP_ARGS(ifp),
4433                                     sppp_auth_type_name(PPP_PAP, h->type),
4434                                     h->ident, ntohs(h->len));
4435                                 sppp_print_bytes((u_char*)(h+1), len-4);
4436                                 log(-1, ">\n");
4437                         }
4438                         break;
4439                 }
4440                 if (debug) {
4441                         log(LOG_DEBUG, SPP_FMT "pap input(%s) "
4442                             "<%s id=0x%x len=%d name=",
4443                             SPP_ARGS(ifp),
4444                             sppp_state_name(sp->state[IDX_PAP]),
4445                             sppp_auth_type_name(PPP_PAP, h->type),
4446                             h->ident, ntohs(h->len));
4447                         sppp_print_string((char*)name, name_len);
4448                         log(-1, " passwd=");
4449                         sppp_print_string((char*)passwd, passwd_len);
4450                         log(-1, ">\n");
4451                 }
4452                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) ||
4453                     passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) ||
4454                     bcmp(name, sp->hisauth.name, name_len) != 0 ||
4455                     bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
4456                         /* action scn, tld */
4457                         mlen = sizeof(FAILMSG) - 1;
4458                         sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
4459                                        sizeof mlen, (const char *)&mlen,
4460                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
4461                                        0);
4462                         pap.tld(sp);
4463                         break;
4464                 }
4465                 /* action sca, perhaps tlu */
4466                 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
4467                     sp->state[IDX_PAP] == STATE_OPENED) {
4468                         mlen = sizeof(SUCCMSG) - 1;
4469                         sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
4470                                        sizeof mlen, (const char *)&mlen,
4471                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
4472                                        0);
4473                 }
4474                 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
4475                         sppp_cp_change_state(&pap, sp, STATE_OPENED);
4476                         pap.tlu(sp);
4477                 }
4478                 break;
4479
4480         /* ack and nak are his authproto */
4481         case PAP_ACK:
4482                 callout_stop(&sp->pap_my_to_ch);
4483                 if (debug) {
4484                         log(LOG_DEBUG, SPP_FMT "pap success",
4485                             SPP_ARGS(ifp));
4486                         name_len = *((char *)h);
4487                         if (len > 5 && name_len) {
4488                                 log(-1, ": ");
4489                                 sppp_print_string((char*)(h+1), name_len);
4490                         }
4491                         log(-1, "\n");
4492                 }
4493                 SPPP_LOCK(sp);
4494                 sp->pp_flags &= ~PP_NEEDAUTH;
4495                 if (sp->myauth.proto == PPP_PAP &&
4496                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
4497                     (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
4498                         /*
4499                          * We are authenticator for PAP but didn't
4500                          * complete yet.  Leave it to tlu to proceed
4501                          * to network phase.
4502                          */
4503                         SPPP_UNLOCK(sp);
4504                         break;
4505                 }
4506                 SPPP_UNLOCK(sp);
4507                 sppp_phase_network(sp);
4508                 break;
4509
4510         case PAP_NAK:
4511                 callout_stop (&sp->pap_my_to_ch);
4512                 if (debug) {
4513                         log(LOG_INFO, SPP_FMT "pap failure",
4514                             SPP_ARGS(ifp));
4515                         name_len = *((char *)h);
4516                         if (len > 5 && name_len) {
4517                                 log(-1, ": ");
4518                                 sppp_print_string((char*)(h+1), name_len);
4519                         }
4520                         log(-1, "\n");
4521                 } else
4522                         log(LOG_INFO, SPP_FMT "pap failure\n",
4523                             SPP_ARGS(ifp));
4524                 /* await LCP shutdown by authenticator */
4525                 break;
4526
4527         default:
4528                 /* Unknown PAP packet type -- ignore. */
4529                 if (debug) {
4530                         log(LOG_DEBUG, SPP_FMT "pap corrupted input "
4531                             "<0x%x id=0x%x len=%d",
4532                             SPP_ARGS(ifp),
4533                             h->type, h->ident, ntohs(h->len));
4534                         sppp_print_bytes((u_char*)(h+1), len-4);
4535                         log(-1, ">\n");
4536                 }
4537                 break;
4538
4539         }
4540 }
4541
4542 static void
4543 sppp_pap_init(struct sppp *sp)
4544 {
4545         /* PAP doesn't have STATE_INITIAL at all. */
4546         sp->state[IDX_PAP] = STATE_CLOSED;
4547         sp->fail_counter[IDX_PAP] = 0;
4548         sp->pp_seq[IDX_PAP] = 0;
4549         sp->pp_rseq[IDX_PAP] = 0;
4550         callout_init(&sp->ch[IDX_PAP], CALLOUT_MPSAFE);
4551         callout_init(&sp->pap_my_to_ch, CALLOUT_MPSAFE);
4552 }
4553
4554 static void
4555 sppp_pap_open(struct sppp *sp)
4556 {
4557         if (sp->hisauth.proto == PPP_PAP &&
4558             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
4559                 /* we are authenticator for PAP, start our timer */
4560                 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4561                 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4562         }
4563         if (sp->myauth.proto == PPP_PAP) {
4564                 /* we are peer, send a request, and start a timer */
4565                 pap.scr(sp);
4566                 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout,
4567                               sppp_pap_my_TO, (void *)sp);
4568         }
4569 }
4570
4571 static void
4572 sppp_pap_close(struct sppp *sp)
4573 {
4574         if (sp->state[IDX_PAP] != STATE_CLOSED)
4575                 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4576 }
4577
4578 /*
4579  * That's the timeout routine if we are authenticator.  Since the
4580  * authenticator is basically passive in PAP, we can't do much here.
4581  */
4582 static void
4583 sppp_pap_TO(void *cookie)
4584 {
4585         struct sppp *sp = (struct sppp *)cookie;
4586         STDDCL;
4587
4588         SPPP_LOCK(sp);
4589         if (debug)
4590                 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
4591                     SPP_ARGS(ifp),
4592                     sppp_state_name(sp->state[IDX_PAP]),
4593                     sp->rst_counter[IDX_PAP]);
4594
4595         if (--sp->rst_counter[IDX_PAP] < 0)
4596                 /* TO- event */
4597                 switch (sp->state[IDX_PAP]) {
4598                 case STATE_REQ_SENT:
4599                         pap.tld(sp);
4600                         sppp_cp_change_state(&pap, sp, STATE_CLOSED);
4601                         break;
4602                 }
4603         else
4604                 /* TO+ event, not very much we could do */
4605                 switch (sp->state[IDX_PAP]) {
4606                 case STATE_REQ_SENT:
4607                         /* sppp_cp_change_state() will restart the timer */
4608                         sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
4609                         break;
4610                 }
4611
4612         SPPP_UNLOCK(sp);
4613 }
4614
4615 /*
4616  * That's the timeout handler if we are peer.  Since the peer is active,
4617  * we need to retransmit our PAP request since it is apparently lost.
4618  * XXX We should impose a max counter.
4619  */
4620 static void
4621 sppp_pap_my_TO(void *cookie)
4622 {
4623         struct sppp *sp = (struct sppp *)cookie;
4624         STDDCL;
4625
4626         if (debug)
4627                 log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
4628                     SPP_ARGS(ifp));
4629
4630         SPPP_LOCK(sp);
4631         pap.scr(sp);
4632         SPPP_UNLOCK(sp);
4633 }
4634
4635 static void
4636 sppp_pap_tlu(struct sppp *sp)
4637 {
4638         STDDCL;
4639
4640         sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
4641
4642         if (debug)
4643                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
4644                     SPP_ARGS(ifp), pap.name);
4645
4646         SPPP_LOCK(sp);
4647         /* indicate to LCP that we need to be closed down */
4648         sp->lcp.protos |= (1 << IDX_PAP);
4649
4650         if (sp->pp_flags & PP_NEEDAUTH) {
4651                 /*
4652                  * Remote is authenticator, but his auth proto didn't
4653                  * complete yet.  Defer the transition to network
4654                  * phase.
4655                  */
4656                 SPPP_UNLOCK(sp);
4657                 return;
4658         }
4659         SPPP_UNLOCK(sp);
4660         sppp_phase_network(sp);
4661 }
4662
4663 static void
4664 sppp_pap_tld(struct sppp *sp)
4665 {
4666         STDDCL;
4667
4668         if (debug)
4669                 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
4670         callout_stop (&sp->ch[IDX_PAP]);
4671         callout_stop (&sp->pap_my_to_ch);
4672         sp->lcp.protos &= ~(1 << IDX_PAP);
4673
4674         lcp.Close(sp);
4675 }
4676
4677 static void
4678 sppp_pap_scr(struct sppp *sp)
4679 {
4680         u_char idlen, pwdlen;
4681
4682         sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP];
4683         pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
4684         idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
4685
4686         sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
4687                        sizeof idlen, (const char *)&idlen,
4688                        (size_t)idlen, sp->myauth.name,
4689                        sizeof pwdlen, (const char *)&pwdlen,
4690                        (size_t)pwdlen, sp->myauth.secret,
4691                        0);
4692 }
4693
4694 /*
4695  * Random miscellaneous functions.
4696  */
4697
4698 /*
4699  * Send a PAP or CHAP proto packet.
4700  *
4701  * Varadic function, each of the elements for the ellipsis is of type
4702  * ``size_t mlen, const u_char *msg''.  Processing will stop iff
4703  * mlen == 0.
4704  * NOTE: never declare variadic functions with types subject to type
4705  * promotion (i.e. u_char). This is asking for big trouble depending
4706  * on the architecture you are on...
4707  */
4708
4709 static void
4710 sppp_auth_send(const struct cp *cp, struct sppp *sp,
4711                unsigned int type, unsigned int id,
4712                ...)
4713 {
4714         STDDCL;
4715         struct ppp_header *h;
4716         struct lcp_header *lh;
4717         struct mbuf *m;
4718         u_char *p;
4719         int len;
4720         unsigned int mlen;
4721         const char *msg;
4722         va_list ap;
4723
4724         MGETHDR (m, M_NOWAIT, MT_DATA);
4725         if (! m)
4726                 return;
4727         m->m_pkthdr.rcvif = 0;
4728
4729         h = mtod (m, struct ppp_header*);
4730         h->address = PPP_ALLSTATIONS;           /* broadcast address */
4731         h->control = PPP_UI;                    /* Unnumbered Info */
4732         h->protocol = htons(cp->proto);
4733
4734         lh = (struct lcp_header*)(h + 1);
4735         lh->type = type;
4736         lh->ident = id;
4737         p = (u_char*) (lh+1);
4738
4739         va_start(ap, id);
4740         len = 0;
4741
4742         while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) {
4743                 msg = va_arg(ap, const char *);
4744                 len += mlen;
4745                 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
4746                         va_end(ap);
4747                         m_freem(m);
4748                         return;
4749                 }
4750
4751                 bcopy(msg, p, mlen);
4752                 p += mlen;
4753         }
4754         va_end(ap);
4755
4756         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
4757         lh->len = htons (LCP_HEADER_LEN + len);
4758
4759         if (debug) {
4760                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
4761                     SPP_ARGS(ifp), cp->name,
4762                     sppp_auth_type_name(cp->proto, lh->type),
4763                     lh->ident, ntohs(lh->len));
4764                 sppp_print_bytes((u_char*) (lh+1), len);
4765                 log(-1, ">\n");
4766         }
4767         if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
4768                 ifp->if_oerrors++;
4769 }
4770
4771 /*
4772  * Flush interface queue.
4773  */
4774 static void
4775 sppp_qflush(struct ifqueue *ifq)
4776 {
4777         struct mbuf *m, *n;
4778
4779         n = ifq->ifq_head;
4780         while ((m = n)) {
4781                 n = m->m_nextpkt;
4782                 m_freem (m);
4783         }
4784         ifq->ifq_head = 0;
4785         ifq->ifq_tail = 0;
4786         ifq->ifq_len = 0;
4787 }
4788
4789 /*
4790  * Send keepalive packets, every 10 seconds.
4791  */
4792 static void
4793 sppp_keepalive(void *dummy)
4794 {
4795         struct sppp *sp = (struct sppp*)dummy;
4796         struct ifnet *ifp = SP2IFP(sp);
4797
4798         SPPP_LOCK(sp);
4799         /* Keepalive mode disabled or channel down? */
4800         if (! (sp->pp_flags & PP_KEEPALIVE) ||
4801             ! (ifp->if_drv_flags & IFF_DRV_RUNNING))
4802                 goto out;
4803
4804         if (sp->pp_mode == PP_FR) {
4805                 sppp_fr_keepalive (sp);
4806                 goto out;
4807         }
4808
4809         /* No keepalive in PPP mode if LCP not opened yet. */
4810         if (sp->pp_mode != IFF_CISCO &&
4811             sp->pp_phase < PHASE_AUTHENTICATE)
4812                 goto out;
4813
4814         if (sp->pp_alivecnt == MAXALIVECNT) {
4815                 /* No keepalive packets got.  Stop the interface. */
4816                 printf (SPP_FMT "down\n", SPP_ARGS(ifp));
4817                 if_down (ifp);
4818                 sppp_qflush (&sp->pp_cpq);
4819                 if (sp->pp_mode != IFF_CISCO) {
4820                         /* XXX */
4821                         /* Shut down the PPP link. */
4822                         lcp.Down(sp);
4823                         /* Initiate negotiation. XXX */
4824                         lcp.Up(sp);
4825                 }
4826         }
4827         if (sp->pp_alivecnt <= MAXALIVECNT)
4828                 ++sp->pp_alivecnt;
4829         if (sp->pp_mode == IFF_CISCO)
4830                 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ,
4831                          ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]);
4832         else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
4833                 long nmagic = htonl (sp->lcp.magic);
4834                 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP];
4835                 sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
4836                         sp->lcp.echoid, 4, &nmagic);
4837         }
4838 out:
4839         SPPP_UNLOCK(sp);
4840         callout_reset(&sp->keepalive_callout, hz * 10, sppp_keepalive,
4841                       (void *)sp);
4842 }
4843
4844 /*
4845  * Get both IP addresses.
4846  */
4847 void
4848 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
4849 {
4850         struct ifnet *ifp = SP2IFP(sp);
4851         struct ifaddr *ifa;
4852         struct sockaddr_in *si, *sm;
4853         u_long ssrc, ddst;
4854
4855         sm = NULL;
4856         ssrc = ddst = 0L;
4857         /*
4858          * Pick the first AF_INET address from the list,
4859          * aliases don't make any sense on a p2p link anyway.
4860          */
4861         si = 0;
4862         if_addr_rlock(ifp);
4863         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4864                 if (ifa->ifa_addr->sa_family == AF_INET) {
4865                         si = (struct sockaddr_in *)ifa->ifa_addr;
4866                         sm = (struct sockaddr_in *)ifa->ifa_netmask;
4867                         if (si)
4868                                 break;
4869                 }
4870         if (ifa) {
4871                 if (si && si->sin_addr.s_addr) {
4872                         ssrc = si->sin_addr.s_addr;
4873                         if (srcmask)
4874                                 *srcmask = ntohl(sm->sin_addr.s_addr);
4875                 }
4876
4877                 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
4878                 if (si && si->sin_addr.s_addr)
4879                         ddst = si->sin_addr.s_addr;
4880         }
4881         if_addr_runlock(ifp);
4882
4883         if (dst) *dst = ntohl(ddst);
4884         if (src) *src = ntohl(ssrc);
4885 }
4886
4887 #ifdef INET
4888 /*
4889  * Set my IP address.
4890  */
4891 static void
4892 sppp_set_ip_addr(struct sppp *sp, u_long src)
4893 {
4894         STDDCL;
4895         struct ifaddr *ifa;
4896         struct sockaddr_in *si;
4897         struct in_ifaddr *ia;
4898
4899         /*
4900          * Pick the first AF_INET address from the list,
4901          * aliases don't make any sense on a p2p link anyway.
4902          */
4903         si = 0;
4904         if_addr_rlock(ifp);
4905         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
4906                 if (ifa->ifa_addr->sa_family == AF_INET) {
4907                         si = (struct sockaddr_in *)ifa->ifa_addr;
4908                         if (si != NULL) {
4909                                 ifa_ref(ifa);
4910                                 break;
4911                         }
4912                 }
4913         }
4914         if_addr_runlock(ifp);
4915
4916         if (ifa != NULL) {
4917                 int error;
4918
4919                 /* delete old route */
4920                 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST);
4921                 if (debug && error) {
4922                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
4923                                 SPP_ARGS(ifp), error);
4924                 }
4925
4926                 /* set new address */
4927                 si->sin_addr.s_addr = htonl(src);
4928                 ia = ifatoia(ifa);
4929                 IN_IFADDR_WLOCK();
4930                 LIST_REMOVE(ia, ia_hash);
4931                 LIST_INSERT_HEAD(INADDR_HASH(si->sin_addr.s_addr), ia, ia_hash);
4932                 IN_IFADDR_WUNLOCK();
4933
4934                 /* add new route */
4935                 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST);
4936                 if (debug && error) {
4937                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
4938                                 SPP_ARGS(ifp), error);
4939                 }
4940                 ifa_free(ifa);
4941         }
4942 }
4943 #endif
4944
4945 #ifdef INET6
4946 /*
4947  * Get both IPv6 addresses.
4948  */
4949 static void
4950 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst,
4951                    struct in6_addr *srcmask)
4952 {
4953         struct ifnet *ifp = SP2IFP(sp);
4954         struct ifaddr *ifa;
4955         struct sockaddr_in6 *si, *sm;
4956         struct in6_addr ssrc, ddst;
4957
4958         sm = NULL;
4959         bzero(&ssrc, sizeof(ssrc));
4960         bzero(&ddst, sizeof(ddst));
4961         /*
4962          * Pick the first link-local AF_INET6 address from the list,
4963          * aliases don't make any sense on a p2p link anyway.
4964          */
4965         si = NULL;
4966         if_addr_rlock(ifp);
4967         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4968                 if (ifa->ifa_addr->sa_family == AF_INET6) {
4969                         si = (struct sockaddr_in6 *)ifa->ifa_addr;
4970                         sm = (struct sockaddr_in6 *)ifa->ifa_netmask;
4971                         if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr))
4972                                 break;
4973                 }
4974         if (ifa) {
4975                 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) {
4976                         bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc));
4977                         if (srcmask) {
4978                                 bcopy(&sm->sin6_addr, srcmask,
4979                                       sizeof(*srcmask));
4980                         }
4981                 }
4982
4983                 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
4984                 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr))
4985                         bcopy(&si->sin6_addr, &ddst, sizeof(ddst));
4986         }
4987
4988         if (dst)
4989                 bcopy(&ddst, dst, sizeof(*dst));
4990         if (src)
4991                 bcopy(&ssrc, src, sizeof(*src));
4992         if_addr_runlock(ifp);
4993 }
4994
4995 #ifdef IPV6CP_MYIFID_DYN
4996 /*
4997  * Generate random ifid.
4998  */
4999 static void
5000 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr)
5001 {
5002         /* TBD */
5003 }
5004
5005 /*
5006  * Set my IPv6 address.
5007  */
5008 static void
5009 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src)
5010 {
5011         STDDCL;
5012         struct ifaddr *ifa;
5013         struct sockaddr_in6 *sin6;
5014
5015         /*
5016          * Pick the first link-local AF_INET6 address from the list,
5017          * aliases don't make any sense on a p2p link anyway.
5018          */
5019
5020         sin6 = NULL;
5021         if_addr_rlock(ifp);
5022         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
5023                 if (ifa->ifa_addr->sa_family == AF_INET6) {
5024                         sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
5025                         if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
5026                                 ifa_ref(ifa);
5027                                 break;
5028                         }
5029                 }
5030         }
5031         if_addr_runlock(ifp);
5032
5033         if (ifa != NULL) {
5034                 int error;
5035                 struct sockaddr_in6 new_sin6 = *sin6;
5036
5037                 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr));
5038                 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1);
5039                 if (debug && error) {
5040                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit "
5041                             " failed, error=%d\n", SPP_ARGS(ifp), error);
5042                 }
5043                 ifa_free(ifa);
5044         }
5045 }
5046 #endif
5047
5048 /*
5049  * Suggest a candidate address to be used by peer.
5050  */
5051 static void
5052 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest)
5053 {
5054         struct in6_addr myaddr;
5055         struct timeval tv;
5056
5057         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
5058
5059         myaddr.s6_addr[8] &= ~0x02;     /* u bit to "local" */
5060         microtime(&tv);
5061         if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) {
5062                 myaddr.s6_addr[14] ^= 0xff;
5063                 myaddr.s6_addr[15] ^= 0xff;
5064         } else {
5065                 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff);
5066                 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff);
5067         }
5068         if (suggest)
5069                 bcopy(&myaddr, suggest, sizeof(myaddr));
5070 }
5071 #endif /*INET6*/
5072
5073 static int
5074 sppp_params(struct sppp *sp, u_long cmd, void *data)
5075 {
5076         u_long subcmd;
5077         struct ifreq *ifr = (struct ifreq *)data;
5078         struct spppreq *spr;
5079         int rv = 0;
5080
5081         if ((spr = malloc(sizeof(struct spppreq), M_TEMP, M_NOWAIT)) == 0)
5082                 return (EAGAIN);
5083         /*
5084          * ifr->ifr_data is supposed to point to a struct spppreq.
5085          * Check the cmd word first before attempting to fetch all the
5086          * data.
5087          */
5088         rv = fueword(ifr->ifr_data, &subcmd);
5089         if (rv == -1) {
5090                 rv = EFAULT;
5091                 goto quit;
5092         }
5093
5094         if (copyin((caddr_t)ifr->ifr_data, spr, sizeof(struct spppreq)) != 0) {
5095                 rv = EFAULT;
5096                 goto quit;
5097         }
5098
5099         switch (subcmd) {
5100         case (u_long)SPPPIOGDEFS:
5101                 if (cmd != SIOCGIFGENERIC) {
5102                         rv = EINVAL;
5103                         break;
5104                 }
5105                 /*
5106                  * We copy over the entire current state, but clean
5107                  * out some of the stuff we don't wanna pass up.
5108                  * Remember, SIOCGIFGENERIC is unprotected, and can be
5109                  * called by any user.  No need to ever get PAP or
5110                  * CHAP secrets back to userland anyway.
5111                  */
5112                 spr->defs.pp_phase = sp->pp_phase;
5113                 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0;
5114                 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0;
5115                 spr->defs.lcp = sp->lcp;
5116                 spr->defs.ipcp = sp->ipcp;
5117                 spr->defs.ipv6cp = sp->ipv6cp;
5118                 spr->defs.myauth = sp->myauth;
5119                 spr->defs.hisauth = sp->hisauth;
5120                 bzero(spr->defs.myauth.secret, AUTHKEYLEN);
5121                 bzero(spr->defs.myauth.challenge, AUTHKEYLEN);
5122                 bzero(spr->defs.hisauth.secret, AUTHKEYLEN);
5123                 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN);
5124                 /*
5125                  * Fixup the LCP timeout value to milliseconds so
5126                  * spppcontrol doesn't need to bother about the value
5127                  * of "hz".  We do the reverse calculation below when
5128                  * setting it.
5129                  */
5130                 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz;
5131                 rv = copyout(spr, (caddr_t)ifr->ifr_data,
5132                              sizeof(struct spppreq));
5133                 break;
5134
5135         case (u_long)SPPPIOSDEFS:
5136                 if (cmd != SIOCSIFGENERIC) {
5137                         rv = EINVAL;
5138                         break;
5139                 }
5140                 /*
5141                  * We have a very specific idea of which fields we
5142                  * allow being passed back from userland, so to not
5143                  * clobber our current state.  For one, we only allow
5144                  * setting anything if LCP is in dead or establish
5145                  * phase.  Once the authentication negotiations
5146                  * started, the authentication settings must not be
5147                  * changed again.  (The administrator can force an
5148                  * ifconfig down in order to get LCP back into dead
5149                  * phase.)
5150                  *
5151                  * Also, we only allow for authentication parameters to be
5152                  * specified.
5153                  *
5154                  * XXX Should allow to set or clear pp_flags.
5155                  *
5156                  * Finally, if the respective authentication protocol to
5157                  * be used is set differently than 0, but the secret is
5158                  * passed as all zeros, we don't trash the existing secret.
5159                  * This allows an administrator to change the system name
5160                  * only without clobbering the secret (which he didn't get
5161                  * back in a previous SPPPIOGDEFS call).  However, the
5162                  * secrets are cleared if the authentication protocol is
5163                  * reset to 0.  */
5164                 if (sp->pp_phase != PHASE_DEAD &&
5165                     sp->pp_phase != PHASE_ESTABLISH) {
5166                         rv = EBUSY;
5167                         break;
5168                 }
5169
5170                 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP &&
5171                      spr->defs.myauth.proto != PPP_CHAP) ||
5172                     (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP &&
5173                      spr->defs.hisauth.proto != PPP_CHAP)) {
5174                         rv = EINVAL;
5175                         break;
5176                 }
5177
5178                 if (spr->defs.myauth.proto == 0)
5179                         /* resetting myauth */
5180                         bzero(&sp->myauth, sizeof sp->myauth);
5181                 else {
5182                         /* setting/changing myauth */
5183                         sp->myauth.proto = spr->defs.myauth.proto;
5184                         bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
5185                         if (spr->defs.myauth.secret[0] != '\0')
5186                                 bcopy(spr->defs.myauth.secret, sp->myauth.secret,
5187                                       AUTHKEYLEN);
5188                 }
5189                 if (spr->defs.hisauth.proto == 0)
5190                         /* resetting hisauth */
5191                         bzero(&sp->hisauth, sizeof sp->hisauth);
5192                 else {
5193                         /* setting/changing hisauth */
5194                         sp->hisauth.proto = spr->defs.hisauth.proto;
5195                         sp->hisauth.flags = spr->defs.hisauth.flags;
5196                         bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
5197                         if (spr->defs.hisauth.secret[0] != '\0')
5198                                 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret,
5199                                       AUTHKEYLEN);
5200                 }
5201                 /* set LCP restart timer timeout */
5202                 if (spr->defs.lcp.timeout != 0)
5203                         sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000;
5204                 /* set VJ enable and IPv6 disable flags */
5205 #ifdef INET
5206                 if (spr->defs.enable_vj)
5207                         sp->confflags |= CONF_ENABLE_VJ;
5208                 else
5209                         sp->confflags &= ~CONF_ENABLE_VJ;
5210 #endif
5211 #ifdef INET6
5212                 if (spr->defs.enable_ipv6)
5213                         sp->confflags |= CONF_ENABLE_IPV6;
5214                 else
5215                         sp->confflags &= ~CONF_ENABLE_IPV6;
5216 #endif
5217                 break;
5218
5219         default:
5220                 rv = EINVAL;
5221         }
5222
5223  quit:
5224         free(spr, M_TEMP);
5225
5226         return (rv);
5227 }
5228
5229 static void
5230 sppp_phase_network(struct sppp *sp)
5231 {
5232         STDDCL;
5233         int i;
5234         u_long mask;
5235
5236         sp->pp_phase = PHASE_NETWORK;
5237
5238         if (debug)
5239                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
5240                     sppp_phase_name(sp->pp_phase));
5241
5242         /* Notify NCPs now. */
5243         for (i = 0; i < IDX_COUNT; i++)
5244                 if ((cps[i])->flags & CP_NCP)
5245                         (cps[i])->Open(sp);
5246
5247         /* Send Up events to all NCPs. */
5248         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
5249                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP))
5250                         (cps[i])->Up(sp);
5251
5252         /* if no NCP is starting, all this was in vain, close down */
5253         sppp_lcp_check_and_close(sp);
5254 }
5255
5256
5257 static const char *
5258 sppp_cp_type_name(u_char type)
5259 {
5260         static char buf[12];
5261         switch (type) {
5262         case CONF_REQ:   return "conf-req";
5263         case CONF_ACK:   return "conf-ack";
5264         case CONF_NAK:   return "conf-nak";
5265         case CONF_REJ:   return "conf-rej";
5266         case TERM_REQ:   return "term-req";
5267         case TERM_ACK:   return "term-ack";
5268         case CODE_REJ:   return "code-rej";
5269         case PROTO_REJ:  return "proto-rej";
5270         case ECHO_REQ:   return "echo-req";
5271         case ECHO_REPLY: return "echo-reply";
5272         case DISC_REQ:   return "discard-req";
5273         }
5274         snprintf (buf, sizeof(buf), "cp/0x%x", type);
5275         return buf;
5276 }
5277
5278 static const char *
5279 sppp_auth_type_name(u_short proto, u_char type)
5280 {
5281         static char buf[12];
5282         switch (proto) {
5283         case PPP_CHAP:
5284                 switch (type) {
5285                 case CHAP_CHALLENGE:    return "challenge";
5286                 case CHAP_RESPONSE:     return "response";
5287                 case CHAP_SUCCESS:      return "success";
5288                 case CHAP_FAILURE:      return "failure";
5289                 }
5290         case PPP_PAP:
5291                 switch (type) {
5292                 case PAP_REQ:           return "req";
5293                 case PAP_ACK:           return "ack";
5294                 case PAP_NAK:           return "nak";
5295                 }
5296         }
5297         snprintf (buf, sizeof(buf), "auth/0x%x", type);
5298         return buf;
5299 }
5300
5301 static const char *
5302 sppp_lcp_opt_name(u_char opt)
5303 {
5304         static char buf[12];
5305         switch (opt) {
5306         case LCP_OPT_MRU:               return "mru";
5307         case LCP_OPT_ASYNC_MAP:         return "async-map";
5308         case LCP_OPT_AUTH_PROTO:        return "auth-proto";
5309         case LCP_OPT_QUAL_PROTO:        return "qual-proto";
5310         case LCP_OPT_MAGIC:             return "magic";
5311         case LCP_OPT_PROTO_COMP:        return "proto-comp";
5312         case LCP_OPT_ADDR_COMP:         return "addr-comp";
5313         }
5314         snprintf (buf, sizeof(buf), "lcp/0x%x", opt);
5315         return buf;
5316 }
5317
5318 #ifdef INET
5319 static const char *
5320 sppp_ipcp_opt_name(u_char opt)
5321 {
5322         static char buf[12];
5323         switch (opt) {
5324         case IPCP_OPT_ADDRESSES:        return "addresses";
5325         case IPCP_OPT_COMPRESSION:      return "compression";
5326         case IPCP_OPT_ADDRESS:          return "address";
5327         }
5328         snprintf (buf, sizeof(buf), "ipcp/0x%x", opt);
5329         return buf;
5330 }
5331 #endif
5332
5333 #ifdef INET6
5334 static const char *
5335 sppp_ipv6cp_opt_name(u_char opt)
5336 {
5337         static char buf[12];
5338         switch (opt) {
5339         case IPV6CP_OPT_IFID:           return "ifid";
5340         case IPV6CP_OPT_COMPRESSION:    return "compression";
5341         }
5342         sprintf (buf, "0x%x", opt);
5343         return buf;
5344 }
5345 #endif
5346
5347 static const char *
5348 sppp_state_name(int state)
5349 {
5350         switch (state) {
5351         case STATE_INITIAL:     return "initial";
5352         case STATE_STARTING:    return "starting";
5353         case STATE_CLOSED:      return "closed";
5354         case STATE_STOPPED:     return "stopped";
5355         case STATE_CLOSING:     return "closing";
5356         case STATE_STOPPING:    return "stopping";
5357         case STATE_REQ_SENT:    return "req-sent";
5358         case STATE_ACK_RCVD:    return "ack-rcvd";
5359         case STATE_ACK_SENT:    return "ack-sent";
5360         case STATE_OPENED:      return "opened";
5361         }
5362         return "illegal";
5363 }
5364
5365 static const char *
5366 sppp_phase_name(enum ppp_phase phase)
5367 {
5368         switch (phase) {
5369         case PHASE_DEAD:        return "dead";
5370         case PHASE_ESTABLISH:   return "establish";
5371         case PHASE_TERMINATE:   return "terminate";
5372         case PHASE_AUTHENTICATE: return "authenticate";
5373         case PHASE_NETWORK:     return "network";
5374         }
5375         return "illegal";
5376 }
5377
5378 static const char *
5379 sppp_proto_name(u_short proto)
5380 {
5381         static char buf[12];
5382         switch (proto) {
5383         case PPP_LCP:   return "lcp";
5384         case PPP_IPCP:  return "ipcp";
5385         case PPP_PAP:   return "pap";
5386         case PPP_CHAP:  return "chap";
5387         case PPP_IPV6CP: return "ipv6cp";
5388         }
5389         snprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto);
5390         return buf;
5391 }
5392
5393 static void
5394 sppp_print_bytes(const u_char *p, u_short len)
5395 {
5396         if (len)
5397                 log(-1, " %*D", len, p, "-");
5398 }
5399
5400 static void
5401 sppp_print_string(const char *p, u_short len)
5402 {
5403         u_char c;
5404
5405         while (len-- > 0) {
5406                 c = *p++;
5407                 /*
5408                  * Print only ASCII chars directly.  RFC 1994 recommends
5409                  * using only them, but we don't rely on it.  */
5410                 if (c < ' ' || c > '~')
5411                         log(-1, "\\x%x", c);
5412                 else
5413                         log(-1, "%c", c);
5414         }
5415 }
5416
5417 #ifdef INET
5418 static const char *
5419 sppp_dotted_quad(u_long addr)
5420 {
5421         static char s[16];
5422         sprintf(s, "%d.%d.%d.%d",
5423                 (int)((addr >> 24) & 0xff),
5424                 (int)((addr >> 16) & 0xff),
5425                 (int)((addr >> 8) & 0xff),
5426                 (int)(addr & 0xff));
5427         return s;
5428 }
5429 #endif
5430
5431 static int
5432 sppp_strnlen(u_char *p, int max)
5433 {
5434         int len;
5435
5436         for (len = 0; len < max && *p; ++p)
5437                 ++len;
5438         return len;
5439 }
5440
5441 /* a dummy, used to drop uninteresting events */
5442 static void
5443 sppp_null(struct sppp *unused)
5444 {
5445         /* do just nothing */
5446 }