1 /* $OpenBSD: if_spppsubr.c,v 1.75 2009/02/18 08:36:20 canacar Exp $ */ 2 /* 3 * Synchronous PPP/Cisco link level subroutines. 4 * Keepalive protocol implemented in both Cisco and PPP modes. 5 * 6 * Copyright (C) 1994-1996 Cronyx Engineering Ltd. 7 * Author: Serge Vakulenko, <vak@cronyx.ru> 8 * 9 * Heavily revamped to conform to RFC 1661. 10 * Copyright (C) 1997, Joerg Wunsch. 11 * 12 * RFC2472 IPv6CP support. 13 * Copyright (C) 2000, Jun-ichiro itojun Hagino <itojun@iijlab.net>. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions are met: 17 * 1. Redistributions of source code must retain the above copyright notice, 18 * this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright notice, 20 * this list of conditions and the following disclaimer in the documentation 21 * and/or other materials provided with the distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE FREEBSD PROJECT ``AS IS'' AND ANY 24 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE 27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 * 35 * From: Version 2.6, Tue May 12 17:10:39 MSD 1998 36 */ 37 38 #include <sys/param.h> 39 40 #define HIDE 41 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/sockio.h> 45 #include <sys/socket.h> 46 #include <sys/proc.h> 47 #include <sys/syslog.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 51 #if defined (__OpenBSD__) 52 #include <sys/timeout.h> 53 #include <crypto/md5.h> 54 #else 55 #include <sys/md5.h> 56 #endif 57 58 #include <net/if.h> 59 #include <net/netisr.h> 60 #include <net/if_types.h> 61 #include <net/route.h> 62 63 /* for arc4random() */ 64 #include <dev/rndvar.h> 65 66 #if defined (__FreeBSD__) || defined(__OpenBSD_) || defined(__NetBSD__) 67 #include <machine/random.h> 68 #endif 69 #if defined (__NetBSD__) || defined (__OpenBSD__) 70 #include <machine/cpu.h> /* XXX for softnet */ 71 #endif 72 #include <sys/stdarg.h> 73 74 #ifdef INET 75 #include <netinet/in.h> 76 #include <netinet/in_systm.h> 77 #include <netinet/in_var.h> 78 #include <netinet/ip.h> 79 #include <netinet/tcp.h> 80 # if defined (__FreeBSD__) || defined (__OpenBSD__) 81 # include <netinet/if_ether.h> 82 # else 83 # include <net/ethertypes.h> 84 # endif 85 #endif 86 87 #ifdef INET6 88 #include <netinet6/in6_var.h> 89 #endif 90 91 #include <net/if_sppp.h> 92 93 #if defined (__FreeBSD__) 94 # define UNTIMEOUT(fun, arg, handle) \ 95 untimeout(fun, arg, handle) 96 #elif defined(__OpenBSD__) 97 # define UNTIMEOUT(fun, arg, handle) \ 98 timeout_del(&(handle)) 99 #else 100 # define UNTIMEOUT(fun, arg, handle) \ 101 untimeout(fun, arg) 102 #endif 103 104 #define LOOPALIVECNT 3 /* loopback detection tries */ 105 #define MAXALIVECNT 3 /* max. missed alive packets */ 106 #define NORECV_TIME 15 /* before we get worried */ 107 108 /* 109 * Interface flags that can be set in an ifconfig command. 110 * 111 * Setting link0 will make the link passive, i.e. it will be marked 112 * as being administrative openable, but won't be opened to begin 113 * with. Incoming calls will be answered, or subsequent calls with 114 * -link1 will cause the administrative open of the LCP layer. 115 * 116 * Setting link1 will cause the link to auto-dial only as packets 117 * arrive to be sent. 118 * 119 * Setting IFF_DEBUG will syslog the option negotiation and state 120 * transitions at level kern.debug. Note: all logs consistently look 121 * like 122 * 123 * <if-name><unit>: <proto-name> <additional info...> 124 * 125 * with <if-name><unit> being something like "bppp0", and <proto-name> 126 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 127 */ 128 129 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 130 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 131 132 #define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */ 133 #define PPP_UI 0x03 /* Unnumbered Information */ 134 #define PPP_IP 0x0021 /* Internet Protocol */ 135 #define PPP_ISO 0x0023 /* ISO OSI Protocol */ 136 #define PPP_XNS 0x0025 /* Xerox NS Protocol */ 137 #define PPP_IPX 0x002b /* Novell IPX Protocol */ 138 #define PPP_IPV6 0x0057 /* Internet Protocol v6 */ 139 #define PPP_LCP 0xc021 /* Link Control Protocol */ 140 #define PPP_PAP 0xc023 /* Password Authentication Protocol */ 141 #define PPP_CHAP 0xc223 /* Challenge-Handshake Auth Protocol */ 142 #define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */ 143 #define PPP_IPV6CP 0x8057 /* IPv6 Control Protocol */ 144 145 #define CONF_REQ 1 /* PPP configure request */ 146 #define CONF_ACK 2 /* PPP configure acknowledge */ 147 #define CONF_NAK 3 /* PPP configure negative ack */ 148 #define CONF_REJ 4 /* PPP configure reject */ 149 #define TERM_REQ 5 /* PPP terminate request */ 150 #define TERM_ACK 6 /* PPP terminate acknowledge */ 151 #define CODE_REJ 7 /* PPP code reject */ 152 #define PROTO_REJ 8 /* PPP protocol reject */ 153 #define ECHO_REQ 9 /* PPP echo request */ 154 #define ECHO_REPLY 10 /* PPP echo reply */ 155 #define DISC_REQ 11 /* PPP discard request */ 156 157 #define LCP_OPT_MRU 1 /* maximum receive unit */ 158 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 159 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 160 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 161 #define LCP_OPT_MAGIC 5 /* magic number */ 162 #define LCP_OPT_RESERVED 6 /* reserved */ 163 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 164 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 165 166 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 167 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol (VJ) */ 168 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 169 170 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 171 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 172 173 #define PAP_REQ 1 /* PAP name/password request */ 174 #define PAP_ACK 2 /* PAP acknowledge */ 175 #define PAP_NAK 3 /* PAP fail */ 176 177 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 178 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 179 #define CHAP_SUCCESS 3 /* CHAP response ok */ 180 #define CHAP_FAILURE 4 /* CHAP response failed */ 181 182 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 183 184 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 185 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 186 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 187 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 188 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 189 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 190 191 /* states are named and numbered according to RFC 1661 */ 192 #define STATE_INITIAL 0 193 #define STATE_STARTING 1 194 #define STATE_CLOSED 2 195 #define STATE_STOPPED 3 196 #define STATE_CLOSING 4 197 #define STATE_STOPPING 5 198 #define STATE_REQ_SENT 6 199 #define STATE_ACK_RCVD 7 200 #define STATE_ACK_SENT 8 201 #define STATE_OPENED 9 202 203 struct ppp_header { 204 u_char address; 205 u_char control; 206 u_short protocol; 207 }; 208 #define PPP_HEADER_LEN sizeof (struct ppp_header) 209 210 struct lcp_header { 211 u_char type; 212 u_char ident; 213 u_short len; 214 }; 215 #define LCP_HEADER_LEN sizeof (struct lcp_header) 216 217 struct cisco_packet { 218 u_int32_t type; 219 u_int32_t par1; 220 u_int32_t par2; 221 u_short rel; 222 u_short time0; 223 u_short time1; 224 }; 225 #define CISCO_PACKET_LEN 18 226 227 /* 228 * We follow the spelling and capitalization of RFC 1661 here, to make 229 * it easier comparing with the standard. Please refer to this RFC in 230 * case you can't make sense out of these abbreviation; it will also 231 * explain the semantics related to the various events and actions. 232 */ 233 struct cp { 234 u_short proto; /* PPP control protocol number */ 235 u_char protoidx; /* index into state table in struct sppp */ 236 u_char flags; 237 #define CP_LCP 0x01 /* this is the LCP */ 238 #define CP_AUTH 0x02 /* this is an authentication protocol */ 239 #define CP_NCP 0x04 /* this is a NCP */ 240 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 241 const char *name; /* name of this control protocol */ 242 /* event handlers */ 243 void (*Up)(struct sppp *sp); 244 void (*Down)(struct sppp *sp); 245 void (*Open)(struct sppp *sp); 246 void (*Close)(struct sppp *sp); 247 void (*TO)(void *sp); 248 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 249 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 250 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 251 /* actions */ 252 void (*tlu)(struct sppp *sp); 253 void (*tld)(struct sppp *sp); 254 void (*tls)(struct sppp *sp); 255 void (*tlf)(struct sppp *sp); 256 void (*scr)(struct sppp *sp); 257 }; 258 259 static struct sppp *spppq; 260 #if defined (__OpenBSD__) 261 static struct timeout keepalive_ch; 262 #endif 263 #if defined (__FreeBSD__) 264 static struct callout_handle keepalive_ch; 265 #endif 266 267 #if defined (__FreeBSD__) 268 #define SPP_FMT "%s%d: " 269 #define SPP_ARGS(ifp) (ifp)->if_name, (ifp)->if_unit 270 #else 271 #define SPP_FMT "%s: " 272 #define SPP_ARGS(ifp) (ifp)->if_xname 273 #endif 274 275 /* 276 * The following disgusting hack gets around the problem that IP TOS 277 * can't be set yet. We want to put "interactive" traffic on a high 278 * priority queue. To decide if traffic is interactive, we check that 279 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 280 * 281 * XXX is this really still necessary? - joerg - 282 */ 283 static u_short interactive_ports[8] = { 284 0, 513, 0, 0, 285 0, 21, 0, 23, 286 }; 287 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 288 289 /* almost every function needs these */ 290 #define STDDCL \ 291 struct ifnet *ifp = &sp->pp_if; \ 292 int debug = ifp->if_flags & IFF_DEBUG 293 294 HIDE int sppp_output(struct ifnet *ifp, struct mbuf *m, 295 struct sockaddr *dst, struct rtentry *rt); 296 297 HIDE void sppp_cisco_send(struct sppp *sp, u_int32_t type, u_int32_t par1, u_int32_t par2); 298 HIDE void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 299 300 HIDE void sppp_cp_input(const struct cp *cp, struct sppp *sp, 301 struct mbuf *m); 302 HIDE void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 303 u_char ident, u_short len, void *data); 304 #ifdef notyet 305 HIDE void sppp_cp_timeout(void *arg); 306 #endif 307 HIDE void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 308 int newstate); 309 HIDE void sppp_auth_send(const struct cp *cp, 310 struct sppp *sp, unsigned int type, u_int id, 311 ...); 312 313 HIDE void sppp_up_event(const struct cp *cp, struct sppp *sp); 314 HIDE void sppp_down_event(const struct cp *cp, struct sppp *sp); 315 HIDE void sppp_open_event(const struct cp *cp, struct sppp *sp); 316 HIDE void sppp_close_event(const struct cp *cp, struct sppp *sp); 317 HIDE void sppp_increasing_timeout(const struct cp *cp, struct sppp *sp); 318 HIDE void sppp_to_event(const struct cp *cp, struct sppp *sp); 319 320 HIDE void sppp_null(struct sppp *sp); 321 322 HIDE void sppp_lcp_init(struct sppp *sp); 323 HIDE void sppp_lcp_up(struct sppp *sp); 324 HIDE void sppp_lcp_down(struct sppp *sp); 325 HIDE void sppp_lcp_open(struct sppp *sp); 326 HIDE void sppp_lcp_close(struct sppp *sp); 327 HIDE void sppp_lcp_TO(void *sp); 328 HIDE int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 329 HIDE void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 330 HIDE void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 331 HIDE void sppp_lcp_tlu(struct sppp *sp); 332 HIDE void sppp_lcp_tld(struct sppp *sp); 333 HIDE void sppp_lcp_tls(struct sppp *sp); 334 HIDE void sppp_lcp_tlf(struct sppp *sp); 335 HIDE void sppp_lcp_scr(struct sppp *sp); 336 HIDE void sppp_lcp_check_and_close(struct sppp *sp); 337 HIDE int sppp_ncp_check(struct sppp *sp); 338 339 HIDE void sppp_ipcp_init(struct sppp *sp); 340 HIDE void sppp_ipcp_up(struct sppp *sp); 341 HIDE void sppp_ipcp_down(struct sppp *sp); 342 HIDE void sppp_ipcp_open(struct sppp *sp); 343 HIDE void sppp_ipcp_close(struct sppp *sp); 344 HIDE void sppp_ipcp_TO(void *sp); 345 HIDE int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 346 HIDE void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 347 HIDE void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 348 HIDE void sppp_ipcp_tlu(struct sppp *sp); 349 HIDE void sppp_ipcp_tld(struct sppp *sp); 350 HIDE void sppp_ipcp_tls(struct sppp *sp); 351 HIDE void sppp_ipcp_tlf(struct sppp *sp); 352 HIDE void sppp_ipcp_scr(struct sppp *sp); 353 354 HIDE void sppp_ipv6cp_init(struct sppp *sp); 355 HIDE void sppp_ipv6cp_up(struct sppp *sp); 356 HIDE void sppp_ipv6cp_down(struct sppp *sp); 357 HIDE void sppp_ipv6cp_open(struct sppp *sp); 358 HIDE void sppp_ipv6cp_close(struct sppp *sp); 359 HIDE void sppp_ipv6cp_TO(void *sp); 360 HIDE int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 361 HIDE void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 362 HIDE void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 363 HIDE void sppp_ipv6cp_tlu(struct sppp *sp); 364 HIDE void sppp_ipv6cp_tld(struct sppp *sp); 365 HIDE void sppp_ipv6cp_tls(struct sppp *sp); 366 HIDE void sppp_ipv6cp_tlf(struct sppp *sp); 367 HIDE void sppp_ipv6cp_scr(struct sppp *sp); 368 HIDE const char *sppp_ipv6cp_opt_name(u_char opt); 369 HIDE void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 370 struct in6_addr *dst, struct in6_addr *srcmask); 371 HIDE void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 372 HIDE void sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr); 373 HIDE void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest); 374 375 HIDE void sppp_pap_input(struct sppp *sp, struct mbuf *m); 376 HIDE void sppp_pap_init(struct sppp *sp); 377 HIDE void sppp_pap_open(struct sppp *sp); 378 HIDE void sppp_pap_close(struct sppp *sp); 379 HIDE void sppp_pap_TO(void *sp); 380 HIDE void sppp_pap_my_TO(void *sp); 381 HIDE void sppp_pap_tlu(struct sppp *sp); 382 HIDE void sppp_pap_tld(struct sppp *sp); 383 HIDE void sppp_pap_scr(struct sppp *sp); 384 385 HIDE void sppp_chap_input(struct sppp *sp, struct mbuf *m); 386 HIDE void sppp_chap_init(struct sppp *sp); 387 HIDE void sppp_chap_open(struct sppp *sp); 388 HIDE void sppp_chap_close(struct sppp *sp); 389 HIDE void sppp_chap_TO(void *sp); 390 HIDE void sppp_chap_tlu(struct sppp *sp); 391 HIDE void sppp_chap_tld(struct sppp *sp); 392 HIDE void sppp_chap_scr(struct sppp *sp); 393 394 HIDE const char *sppp_auth_type_name(u_short proto, u_char type); 395 HIDE const char *sppp_cp_type_name(u_char type); 396 HIDE const char *sppp_dotted_quad(u_int32_t addr); 397 HIDE const char *sppp_ipcp_opt_name(u_char opt); 398 HIDE const char *sppp_lcp_opt_name(u_char opt); 399 HIDE const char *sppp_phase_name(enum ppp_phase phase); 400 HIDE const char *sppp_proto_name(u_short proto); 401 HIDE const char *sppp_state_name(int state); 402 HIDE int sppp_get_params(struct sppp *sp, struct ifreq *data); 403 HIDE int sppp_set_params(struct sppp *sp, struct ifreq *data); 404 HIDE void sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, 405 u_int32_t *srcmask); 406 HIDE void sppp_keepalive(void *dummy); 407 HIDE void sppp_phase_network(struct sppp *sp); 408 HIDE void sppp_print_bytes(const u_char *p, u_short len); 409 HIDE void sppp_print_string(const char *p, u_short len); 410 HIDE void sppp_qflush(struct ifqueue *ifq); 411 HIDE void sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, 412 u_int32_t hisaddr); 413 HIDE void sppp_clear_ip_addrs(struct sppp *sp); 414 HIDE void sppp_set_phase(struct sppp *sp); 415 416 /* our control protocol descriptors */ 417 static const struct cp lcp = { 418 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 419 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 420 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 421 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 422 sppp_lcp_scr 423 }; 424 425 static const struct cp ipcp = { 426 PPP_IPCP, IDX_IPCP, 427 #ifdef INET /* don't run IPCP if there's no IPv4 support */ 428 CP_NCP, 429 #else 430 0, 431 #endif 432 "ipcp", 433 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 434 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 435 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 436 sppp_ipcp_scr 437 }; 438 439 static const struct cp ipv6cp = { 440 PPP_IPV6CP, IDX_IPV6CP, 441 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 442 CP_NCP, 443 #else 444 0, 445 #endif 446 "ipv6cp", 447 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 448 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 449 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 450 sppp_ipv6cp_scr 451 }; 452 453 static const struct cp pap = { 454 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 455 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 456 sppp_pap_TO, 0, 0, 0, 457 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 458 sppp_pap_scr 459 }; 460 461 static const struct cp chap = { 462 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 463 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 464 sppp_chap_TO, 0, 0, 0, 465 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 466 sppp_chap_scr 467 }; 468 469 static const struct cp *cps[IDX_COUNT] = { 470 &lcp, /* IDX_LCP */ 471 &ipcp, /* IDX_IPCP */ 472 &ipv6cp, /* IDX_IPV6CP */ 473 &pap, /* IDX_PAP */ 474 &chap, /* IDX_CHAP */ 475 }; 476 477 478 /* 479 * Exported functions, comprising our interface to the lower layer. 480 */ 481 482 #if defined(__OpenBSD__) 483 /* Workaround */ 484 void 485 spppattach(struct ifnet *ifp) 486 { 487 } 488 #endif 489 490 /* 491 * Process the received packet. 492 */ 493 void 494 sppp_input(struct ifnet *ifp, struct mbuf *m) 495 { 496 struct ppp_header *h, ht; 497 struct ifqueue *inq = 0; 498 struct sppp *sp = (struct sppp *)ifp; 499 struct timeval tv; 500 int debug = ifp->if_flags & IFF_DEBUG; 501 int s; 502 503 if (ifp->if_flags & IFF_UP) { 504 /* Count received bytes, add hardware framing */ 505 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 506 /* Note time of last receive */ 507 getmicrouptime(&tv); 508 sp->pp_last_receive = tv.tv_sec; 509 } 510 511 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 512 /* Too small packet, drop it. */ 513 if (debug) 514 log(LOG_DEBUG, 515 SPP_FMT "input packet is too small, %d bytes\n", 516 SPP_ARGS(ifp), m->m_pkthdr.len); 517 drop: 518 ++ifp->if_ierrors; 519 ++ifp->if_iqdrops; 520 m_freem (m); 521 return; 522 } 523 524 if (sp->pp_flags & PP_NOFRAMING) { 525 memcpy(&ht.protocol, mtod(m, char *), sizeof(ht.protocol)); 526 m_adj(m, 2); 527 ht.control = PPP_UI; 528 ht.address = PPP_ALLSTATIONS; 529 h = &ht; 530 } else { 531 /* Get PPP header. */ 532 h = mtod (m, struct ppp_header*); 533 m_adj (m, PPP_HEADER_LEN); 534 } 535 536 /* preserve the alignment */ 537 if (m->m_len < m->m_pkthdr.len) { 538 m = m_pullup2(m, m->m_pkthdr.len); 539 if (m == NULL) { 540 if (debug) 541 log(LOG_DEBUG, 542 SPP_FMT "Failed to align packet!\n", SPP_ARGS(ifp)); 543 ++ifp->if_ierrors; 544 ++ifp->if_iqdrops; 545 return; 546 } 547 } 548 549 switch (h->address) { 550 case PPP_ALLSTATIONS: 551 if (h->control != PPP_UI) 552 goto invalid; 553 if (sp->pp_flags & PP_CISCO) { 554 if (debug) 555 log(LOG_DEBUG, 556 SPP_FMT "PPP packet in Cisco mode " 557 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 558 SPP_ARGS(ifp), 559 h->address, h->control, ntohs(h->protocol)); 560 goto drop; 561 } 562 switch (ntohs (h->protocol)) { 563 default: 564 if (sp->state[IDX_LCP] == STATE_OPENED) 565 sppp_cp_send (sp, PPP_LCP, PROTO_REJ, 566 ++sp->pp_seq, 2, &h->protocol); 567 if (debug) 568 log(LOG_DEBUG, 569 SPP_FMT "invalid input protocol " 570 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 571 SPP_ARGS(ifp), 572 h->address, h->control, ntohs(h->protocol)); 573 ++ifp->if_noproto; 574 goto drop; 575 case PPP_LCP: 576 sppp_cp_input(&lcp, sp, m); 577 m_freem (m); 578 return; 579 case PPP_PAP: 580 if (sp->pp_phase >= PHASE_AUTHENTICATE) 581 sppp_pap_input(sp, m); 582 m_freem (m); 583 return; 584 case PPP_CHAP: 585 if (sp->pp_phase >= PHASE_AUTHENTICATE) 586 sppp_chap_input(sp, m); 587 m_freem (m); 588 return; 589 #ifdef INET 590 case PPP_IPCP: 591 if (sp->pp_phase == PHASE_NETWORK) 592 sppp_cp_input(&ipcp, sp, m); 593 m_freem (m); 594 return; 595 case PPP_IP: 596 if (sp->state[IDX_IPCP] == STATE_OPENED) { 597 schednetisr (NETISR_IP); 598 inq = &ipintrq; 599 sp->pp_last_activity = tv.tv_sec; 600 } 601 break; 602 #endif 603 #ifdef INET6 604 case PPP_IPV6CP: 605 if (sp->pp_phase == PHASE_NETWORK) 606 sppp_cp_input(&ipv6cp, sp, m); 607 m_freem (m); 608 return; 609 case PPP_IPV6: 610 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 611 schednetisr (NETISR_IPV6); 612 inq = &ip6intrq; 613 sp->pp_last_activity = tv.tv_sec; 614 } 615 break; 616 #endif 617 } 618 break; 619 case CISCO_MULTICAST: 620 case CISCO_UNICAST: 621 /* Don't check the control field here (RFC 1547). */ 622 if (! (sp->pp_flags & PP_CISCO)) { 623 if (debug) 624 log(LOG_DEBUG, 625 SPP_FMT "Cisco packet in PPP mode " 626 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 627 SPP_ARGS(ifp), 628 h->address, h->control, ntohs(h->protocol)); 629 goto drop; 630 } 631 switch (ntohs (h->protocol)) { 632 default: 633 ++ifp->if_noproto; 634 goto invalid; 635 case CISCO_KEEPALIVE: 636 sppp_cisco_input ((struct sppp*) ifp, m); 637 m_freem (m); 638 return; 639 #ifdef INET 640 case ETHERTYPE_IP: 641 schednetisr (NETISR_IP); 642 inq = &ipintrq; 643 break; 644 #endif 645 #ifdef INET6 646 case ETHERTYPE_IPV6: 647 schednetisr (NETISR_IPV6); 648 inq = &ip6intrq; 649 break; 650 #endif 651 } 652 break; 653 default: /* Invalid PPP packet. */ 654 invalid: 655 if (debug) 656 log(LOG_DEBUG, 657 SPP_FMT "invalid input packet " 658 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 659 SPP_ARGS(ifp), 660 h->address, h->control, ntohs(h->protocol)); 661 goto drop; 662 } 663 664 if (! (ifp->if_flags & IFF_UP) || ! inq) 665 goto drop; 666 667 /* Check queue. */ 668 s = splnet(); 669 if (IF_QFULL (inq)) { 670 /* Queue overflow. */ 671 IF_DROP(inq); 672 splx(s); 673 if (debug) 674 log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n", 675 SPP_ARGS(ifp)); 676 if (!inq->ifq_congestion) 677 if_congestion(inq); 678 goto drop; 679 } 680 IF_ENQUEUE(inq, m); 681 splx(s); 682 } 683 684 /* 685 * Enqueue transmit packet. 686 */ 687 HIDE int 688 sppp_output(struct ifnet *ifp, struct mbuf *m, 689 struct sockaddr *dst, struct rtentry *rt) 690 { 691 struct sppp *sp = (struct sppp*) ifp; 692 struct ppp_header *h; 693 struct ifqueue *ifq = NULL; 694 struct timeval tv; 695 int s, len, rv = 0; 696 u_int16_t protocol; 697 698 s = splnet(); 699 700 getmicrouptime(&tv); 701 sp->pp_last_activity = tv.tv_sec; 702 703 if ((ifp->if_flags & IFF_UP) == 0 || 704 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 705 m_freem (m); 706 splx (s); 707 return (ENETDOWN); 708 } 709 710 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 711 /* 712 * Interface is not yet running, but auto-dial. Need 713 * to start LCP for it. 714 */ 715 ifp->if_flags |= IFF_RUNNING; 716 splx(s); 717 lcp.Open(sp); 718 s = splnet(); 719 } 720 721 #ifdef INET 722 /* 723 * Put low delay, telnet, rlogin and ftp control packets 724 * in front of the queue. 725 */ 726 if (dst->sa_family == AF_INET) { 727 struct ip *ip = NULL; 728 struct tcphdr *th = NULL; 729 730 if (m->m_len >= sizeof(struct ip)) { 731 ip = mtod(m, struct ip *); 732 if (ip->ip_p == IPPROTO_TCP && 733 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 734 sizeof(struct tcphdr)) { 735 th = (struct tcphdr *) 736 ((caddr_t)ip + (ip->ip_hl << 2)); 737 } 738 } 739 /* 740 * When using dynamic local IP address assignment by using 741 * 0.0.0.0 as a local address, the first TCP session will 742 * not connect because the local TCP checksum is computed 743 * using 0.0.0.0 which will later become our real IP address 744 * so the TCP checksum computed at the remote end will 745 * become invalid. So we 746 * - don't let packets with src ip addr 0 thru 747 * - we flag TCP packets with src ip 0 as an error 748 */ 749 750 if(ip && ip->ip_src.s_addr == INADDR_ANY) { 751 u_int8_t proto = ip->ip_p; 752 753 m_freem(m); 754 splx(s); 755 if(proto == IPPROTO_TCP) 756 return (EADDRNOTAVAIL); 757 else 758 return (0); 759 } 760 761 if (!IF_QFULL(&sp->pp_fastq) && 762 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 763 (th && (INTERACTIVE(ntohs(th->th_sport)) || 764 INTERACTIVE(ntohs(th->th_dport)))))) 765 ifq = &sp->pp_fastq; 766 } 767 #endif 768 769 if (sp->pp_flags & PP_NOFRAMING) 770 goto skip_header; 771 /* 772 * Prepend general data packet PPP header. For now, IP only. 773 */ 774 M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT); 775 if (!m) { 776 if (ifp->if_flags & IFF_DEBUG) 777 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n", 778 SPP_ARGS(ifp)); 779 ++ifp->if_oerrors; 780 splx (s); 781 return (ENOBUFS); 782 } 783 /* 784 * May want to check size of packet 785 * (albeit due to the implementation it's always enough) 786 */ 787 h = mtod (m, struct ppp_header*); 788 if (sp->pp_flags & PP_CISCO) { 789 h->address = CISCO_UNICAST; /* unicast address */ 790 h->control = 0; 791 } else { 792 h->address = PPP_ALLSTATIONS; /* broadcast address */ 793 h->control = PPP_UI; /* Unnumbered Info */ 794 } 795 796 skip_header: 797 switch (dst->sa_family) { 798 #ifdef INET 799 case AF_INET: /* Internet Protocol */ 800 if (sp->pp_flags & PP_CISCO) 801 protocol = htons (ETHERTYPE_IP); 802 else { 803 /* 804 * Don't choke with an ENETDOWN early. It's 805 * possible that we just started dialing out, 806 * so don't drop the packet immediately. If 807 * we notice that we run out of buffer space 808 * below, we will however remember that we are 809 * not ready to carry IP packets, and return 810 * ENETDOWN, as opposed to ENOBUFS. 811 */ 812 protocol = htons(PPP_IP); 813 if (sp->state[IDX_IPCP] != STATE_OPENED) 814 rv = ENETDOWN; 815 } 816 break; 817 #endif 818 #ifdef INET6 819 case AF_INET6: /* Internet Protocol v6 */ 820 if (sp->pp_flags & PP_CISCO) 821 protocol = htons (ETHERTYPE_IPV6); 822 else { 823 /* 824 * Don't choke with an ENETDOWN early. It's 825 * possible that we just started dialing out, 826 * so don't drop the packet immediately. If 827 * we notice that we run out of buffer space 828 * below, we will however remember that we are 829 * not ready to carry IPv6 packets, and return 830 * ENETDOWN, as opposed to ENOBUFS. 831 */ 832 protocol = htons(PPP_IPV6); 833 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 834 rv = ENETDOWN; 835 } 836 break; 837 #endif 838 default: 839 m_freem(m); 840 ++ifp->if_oerrors; 841 splx(s); 842 return (EAFNOSUPPORT); 843 } 844 845 if (sp->pp_flags & PP_NOFRAMING) { 846 M_PREPEND(m, 2, M_DONTWAIT); 847 if (m == NULL) { 848 if (ifp->if_flags & IFF_DEBUG) 849 log(LOG_DEBUG, SPP_FMT 850 "no memory for transmit header\n", 851 SPP_ARGS(ifp)); 852 ++ifp->if_oerrors; 853 splx(s); 854 return (ENOBUFS); 855 } 856 *mtod(m, u_int16_t *) = protocol; 857 } else 858 h->protocol = protocol; 859 860 /* 861 * Queue message on interface, and start output if interface 862 * not yet active. 863 */ 864 len = m->m_pkthdr.len; 865 if (ifq != NULL 866 #ifdef ALTQ 867 && ALTQ_IS_ENABLED(&ifp->if_snd) == 0 868 #endif 869 ) { 870 if (IF_QFULL (ifq)) { 871 IF_DROP (&ifp->if_snd); 872 m_freem (m); 873 if (rv == 0) 874 rv = ENOBUFS; 875 } else 876 IF_ENQUEUE (ifq, m); 877 } else 878 IFQ_ENQUEUE(&ifp->if_snd, m, NULL, rv); 879 880 if (rv != 0) { 881 ++ifp->if_oerrors; 882 splx (s); 883 return (rv); 884 } 885 886 if (!(ifp->if_flags & IFF_OACTIVE)) 887 (*ifp->if_start) (ifp); 888 889 /* 890 * Count output packets and bytes. 891 * The packet length includes header, FCS and 1 flag, 892 * according to RFC 1333. 893 */ 894 ifp->if_obytes += len + sp->pp_framebytes; 895 splx (s); 896 return (0); 897 } 898 899 void 900 sppp_attach(struct ifnet *ifp) 901 { 902 struct sppp *sp = (struct sppp*) ifp; 903 int i; 904 905 /* Initialize keepalive handler. */ 906 if (! spppq) { 907 #if defined (__FreeBSD__) 908 keepalive_ch = timeout(sppp_keepalive, 0, hz * 10); 909 #elif defined(__OpenBSD__) 910 timeout_set(&keepalive_ch, sppp_keepalive, NULL); 911 timeout_add(&keepalive_ch, hz * 10); 912 #endif 913 } 914 915 /* Insert new entry into the keepalive list. */ 916 sp->pp_next = spppq; 917 spppq = sp; 918 919 sp->pp_if.if_type = IFT_PPP; 920 sp->pp_if.if_output = sppp_output; 921 IFQ_SET_MAXLEN(&sp->pp_if.if_snd, 50); 922 sp->pp_fastq.ifq_maxlen = 50; 923 sp->pp_cpq.ifq_maxlen = 50; 924 sp->pp_loopcnt = 0; 925 sp->pp_alivecnt = 0; 926 sp->pp_last_activity = 0; 927 sp->pp_last_receive = 0; 928 sp->pp_seq = 0; 929 sp->pp_rseq = 0; 930 sp->pp_phase = PHASE_DEAD; 931 sp->pp_up = lcp.Up; 932 sp->pp_down = lcp.Down; 933 934 935 for (i = 0; i < IDX_COUNT; i++) 936 timeout_set(&sp->ch[i], (cps[i])->TO, (void *)sp); 937 timeout_set(&sp->pap_my_to_ch, sppp_pap_my_TO, (void *)sp); 938 939 sppp_lcp_init(sp); 940 sppp_ipcp_init(sp); 941 sppp_ipv6cp_init(sp); 942 sppp_pap_init(sp); 943 sppp_chap_init(sp); 944 } 945 946 void 947 sppp_detach(struct ifnet *ifp) 948 { 949 struct sppp **q, *p, *sp = (struct sppp*) ifp; 950 int i; 951 952 /* Remove the entry from the keepalive list. */ 953 for (q = &spppq; (p = *q); q = &p->pp_next) 954 if (p == sp) { 955 *q = p->pp_next; 956 break; 957 } 958 959 /* Stop keepalive handler. */ 960 if (! spppq) 961 UNTIMEOUT(sppp_keepalive, 0, keepalive_ch); 962 963 for (i = 0; i < IDX_COUNT; i++) 964 UNTIMEOUT((cps[i])->TO, (void *)sp, sp->ch[i]); 965 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 966 967 /* release authentication data */ 968 if (sp->myauth.name != NULL) 969 free(sp->myauth.name, M_DEVBUF); 970 if (sp->myauth.secret != NULL) 971 free(sp->myauth.secret, M_DEVBUF); 972 if (sp->hisauth.name != NULL) 973 free(sp->hisauth.name, M_DEVBUF); 974 if (sp->hisauth.secret != NULL) 975 free(sp->hisauth.secret, M_DEVBUF); 976 } 977 978 /* 979 * Flush the interface output queue. 980 */ 981 void 982 sppp_flush(struct ifnet *ifp) 983 { 984 struct sppp *sp = (struct sppp*) ifp; 985 986 IFQ_PURGE(&sp->pp_if.if_snd); 987 sppp_qflush (&sp->pp_fastq); 988 sppp_qflush (&sp->pp_cpq); 989 } 990 991 /* 992 * Check if the output queue is empty. 993 */ 994 int 995 sppp_isempty(struct ifnet *ifp) 996 { 997 struct sppp *sp = (struct sppp*) ifp; 998 int empty, s; 999 1000 s = splnet(); 1001 empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head && 1002 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 1003 splx(s); 1004 return (empty); 1005 } 1006 1007 /* 1008 * Get next packet to send. 1009 */ 1010 struct mbuf * 1011 sppp_dequeue(struct ifnet *ifp) 1012 { 1013 struct sppp *sp = (struct sppp*) ifp; 1014 struct mbuf *m; 1015 int s; 1016 1017 s = splnet(); 1018 /* 1019 * Process only the control protocol queue until we have at 1020 * least one NCP open. 1021 * 1022 * Do always serve all three queues in Cisco mode. 1023 */ 1024 IF_DEQUEUE(&sp->pp_cpq, m); 1025 if (m == NULL && 1026 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1027 IF_DEQUEUE(&sp->pp_fastq, m); 1028 if (m == NULL) 1029 IFQ_DEQUEUE (&sp->pp_if.if_snd, m); 1030 } 1031 splx(s); 1032 return m; 1033 } 1034 1035 /* 1036 * Pick the next packet, do not remove it from the queue. 1037 */ 1038 struct mbuf * 1039 sppp_pick(struct ifnet *ifp) 1040 { 1041 struct sppp *sp = (struct sppp*)ifp; 1042 struct mbuf *m; 1043 int s; 1044 1045 s = splnet(); 1046 m = sp->pp_cpq.ifq_head; 1047 if (m == NULL && 1048 (sp->pp_phase == PHASE_NETWORK || 1049 (sp->pp_flags & PP_CISCO) != 0)) 1050 if ((m = sp->pp_fastq.ifq_head) == NULL) 1051 IFQ_POLL(&sp->pp_if.if_snd, m); 1052 splx (s); 1053 return (m); 1054 } 1055 1056 /* 1057 * Process an ioctl request. Called on low priority level. 1058 */ 1059 int 1060 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1061 { 1062 struct ifreq *ifr = (struct ifreq*) data; 1063 struct sppp *sp = (struct sppp*) ifp; 1064 int s, rv, going_up, going_down, newmode; 1065 1066 s = splnet(); 1067 rv = 0; 1068 switch (cmd) { 1069 case SIOCAIFADDR: 1070 case SIOCSIFDSTADDR: 1071 break; 1072 1073 case SIOCSIFADDR: 1074 if_up(ifp); 1075 /* FALLTHROUGH */ 1076 1077 case SIOCSIFFLAGS: 1078 going_up = (ifp->if_flags & IFF_UP) && 1079 (ifp->if_flags & IFF_RUNNING) == 0; 1080 going_down = (ifp->if_flags & IFF_UP) == 0 && 1081 (ifp->if_flags & IFF_RUNNING); 1082 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1083 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1084 /* sanity */ 1085 newmode = IFF_PASSIVE; 1086 ifp->if_flags &= ~IFF_AUTO; 1087 } 1088 1089 if (going_up || going_down) 1090 if (!(sp->pp_flags & PP_CISCO)) 1091 lcp.Close(sp); 1092 1093 if (going_up && newmode == 0) { 1094 /* neither auto-dial nor passive */ 1095 ifp->if_flags |= IFF_RUNNING; 1096 if (!(sp->pp_flags & PP_CISCO)) 1097 lcp.Open(sp); 1098 } else if (going_down) { 1099 sppp_flush(ifp); 1100 ifp->if_flags &= ~IFF_RUNNING; 1101 } 1102 break; 1103 1104 #ifdef SIOCSIFMTU 1105 case SIOCSIFMTU: 1106 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) { 1107 splx(s); 1108 return (EINVAL); 1109 } 1110 ifp->if_mtu = ifr->ifr_mtu; 1111 break; 1112 #endif 1113 #ifdef SLIOCSETMTU 1114 case SLIOCSETMTU: 1115 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru) { 1116 splx(s); 1117 return (EINVAL); 1118 } 1119 ifp->if_mtu = *(short*)data; 1120 break; 1121 #endif 1122 #ifdef SIOCGIFMTU 1123 case SIOCGIFMTU: 1124 ifr->ifr_mtu = ifp->if_mtu; 1125 break; 1126 #endif 1127 #ifdef SLIOCGETMTU 1128 case SLIOCGETMTU: 1129 *(short*)data = ifp->if_mtu; 1130 break; 1131 #endif 1132 case SIOCADDMULTI: 1133 case SIOCDELMULTI: 1134 break; 1135 1136 case SIOCGIFGENERIC: 1137 rv = sppp_get_params(sp, ifr); 1138 break; 1139 1140 case SIOCSIFGENERIC: 1141 rv = sppp_set_params(sp, ifr); 1142 break; 1143 1144 default: 1145 rv = ENOTTY; 1146 } 1147 splx(s); 1148 return rv; 1149 } 1150 1151 1152 /* 1153 * Cisco framing implementation. 1154 */ 1155 1156 /* 1157 * Handle incoming Cisco keepalive protocol packets. 1158 */ 1159 HIDE void 1160 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1161 { 1162 STDDCL; 1163 struct cisco_packet *h; 1164 u_int32_t me, mymask; 1165 1166 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1167 if (debug) 1168 log(LOG_DEBUG, 1169 SPP_FMT "cisco invalid packet length: %d bytes\n", 1170 SPP_ARGS(ifp), m->m_pkthdr.len); 1171 return; 1172 } 1173 h = mtod (m, struct cisco_packet*); 1174 if (debug) 1175 log(LOG_DEBUG, 1176 SPP_FMT "cisco input: %d bytes " 1177 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1178 SPP_ARGS(ifp), m->m_pkthdr.len, 1179 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1180 (u_int)h->time0, (u_int)h->time1); 1181 switch (ntohl (h->type)) { 1182 default: 1183 if (debug) 1184 addlog(SPP_FMT "cisco unknown packet type: 0x%x\n", 1185 SPP_ARGS(ifp), ntohl(h->type)); 1186 break; 1187 case CISCO_ADDR_REPLY: 1188 /* Reply on address request, ignore */ 1189 break; 1190 case CISCO_KEEPALIVE_REQ: 1191 sp->pp_alivecnt = 0; 1192 sp->pp_rseq = ntohl (h->par1); 1193 if (sp->pp_seq == sp->pp_rseq) { 1194 /* Local and remote sequence numbers are equal. 1195 * Probably, the line is in loopback mode. */ 1196 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1197 log(LOG_INFO, SPP_FMT "loopback\n", 1198 SPP_ARGS(ifp)); 1199 sp->pp_loopcnt = 0; 1200 if (ifp->if_flags & IFF_UP) { 1201 if_down (ifp); 1202 sppp_qflush (&sp->pp_cpq); 1203 } 1204 } 1205 ++sp->pp_loopcnt; 1206 1207 /* Generate new local sequence number */ 1208 #if defined (__FreeBSD__) || defined (__NetBSD__) || defined(__OpenBSD__) 1209 sp->pp_seq = arc4random(); 1210 #else 1211 sp->pp_seq ^= time.tv_sec ^ time.tv_usec; 1212 #endif 1213 break; 1214 } 1215 sp->pp_loopcnt = 0; 1216 if (! (ifp->if_flags & IFF_UP) && 1217 (ifp->if_flags & IFF_RUNNING)) { 1218 if_up(ifp); 1219 if (debug) 1220 log(LOG_INFO, SPP_FMT "up\n", SPP_ARGS(ifp)); 1221 } 1222 break; 1223 case CISCO_ADDR_REQ: 1224 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1225 if (me != 0) 1226 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1227 break; 1228 } 1229 } 1230 1231 /* 1232 * Send Cisco keepalive packet. 1233 */ 1234 HIDE void 1235 sppp_cisco_send(struct sppp *sp, u_int32_t type, u_int32_t par1, u_int32_t par2) 1236 { 1237 STDDCL; 1238 struct ppp_header *h; 1239 struct cisco_packet *ch; 1240 struct mbuf *m; 1241 struct timeval tv; 1242 1243 getmicrouptime(&tv); 1244 1245 MGETHDR (m, M_DONTWAIT, MT_DATA); 1246 if (! m) 1247 return; 1248 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1249 m->m_pkthdr.rcvif = 0; 1250 1251 h = mtod (m, struct ppp_header*); 1252 h->address = CISCO_MULTICAST; 1253 h->control = 0; 1254 h->protocol = htons (CISCO_KEEPALIVE); 1255 1256 ch = (struct cisco_packet*) (h + 1); 1257 ch->type = htonl (type); 1258 ch->par1 = htonl (par1); 1259 ch->par2 = htonl (par2); 1260 ch->rel = -1; 1261 1262 ch->time0 = htons ((u_short) (tv.tv_sec >> 16)); 1263 ch->time1 = htons ((u_short) tv.tv_sec); 1264 1265 if (debug) 1266 log(LOG_DEBUG, SPP_FMT 1267 "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n", 1268 SPP_ARGS(ifp), ntohl(ch->type), ch->par1, ch->par2, 1269 (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1); 1270 1271 if (IF_QFULL (&sp->pp_cpq)) { 1272 IF_DROP (&sp->pp_fastq); 1273 IF_DROP (&ifp->if_snd); 1274 m_freem (m); 1275 m = NULL; 1276 } else 1277 IF_ENQUEUE (&sp->pp_cpq, m); 1278 if (! (ifp->if_flags & IFF_OACTIVE)) 1279 (*ifp->if_start) (ifp); 1280 if (m != NULL) 1281 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1282 } 1283 1284 /* 1285 * PPP protocol implementation. 1286 */ 1287 1288 /* 1289 * Send PPP control protocol packet. 1290 */ 1291 HIDE void 1292 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1293 u_char ident, u_short len, void *data) 1294 { 1295 STDDCL; 1296 struct ppp_header *h; 1297 struct lcp_header *lh; 1298 struct mbuf *m; 1299 size_t pkthdrlen; 1300 1301 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1302 1303 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1304 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1305 MGETHDR (m, M_DONTWAIT, MT_DATA); 1306 if (! m) 1307 return; 1308 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1309 m->m_pkthdr.rcvif = 0; 1310 1311 if (sp->pp_flags & PP_NOFRAMING) { 1312 *mtod(m, u_int16_t *) = htons(proto); 1313 lh = (struct lcp_header *)(mtod(m, u_int8_t *) + 2); 1314 } else { 1315 h = mtod (m, struct ppp_header*); 1316 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1317 h->control = PPP_UI; /* Unnumbered Info */ 1318 h->protocol = htons (proto); /* Link Control Protocol */ 1319 lh = (struct lcp_header*) (h + 1); 1320 } 1321 lh->type = type; 1322 lh->ident = ident; 1323 lh->len = htons (LCP_HEADER_LEN + len); 1324 if (len) 1325 bcopy (data, lh+1, len); 1326 1327 if (debug) { 1328 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 1329 SPP_ARGS(ifp), 1330 sppp_proto_name(proto), 1331 sppp_cp_type_name (lh->type), lh->ident, 1332 ntohs (lh->len)); 1333 if (len) 1334 sppp_print_bytes ((u_char*) (lh+1), len); 1335 addlog(">\n"); 1336 } 1337 if (IF_QFULL (&sp->pp_cpq)) { 1338 IF_DROP (&sp->pp_fastq); 1339 IF_DROP (&ifp->if_snd); 1340 m_freem (m); 1341 ++ifp->if_oerrors; 1342 m = NULL; 1343 } else 1344 IF_ENQUEUE (&sp->pp_cpq, m); 1345 if (!(ifp->if_flags & IFF_OACTIVE)) 1346 (*ifp->if_start) (ifp); 1347 if (m != NULL) 1348 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1349 } 1350 1351 /* 1352 * Handle incoming PPP control protocol packets. 1353 */ 1354 HIDE void 1355 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1356 { 1357 STDDCL; 1358 struct lcp_header *h; 1359 int len = m->m_pkthdr.len; 1360 int rv; 1361 u_char *p; 1362 u_long nmagic; 1363 1364 if (len < 4) { 1365 if (debug) 1366 log(LOG_DEBUG, 1367 SPP_FMT "%s invalid packet length: %d bytes\n", 1368 SPP_ARGS(ifp), cp->name, len); 1369 return; 1370 } 1371 h = mtod (m, struct lcp_header*); 1372 if (debug) { 1373 log(LOG_DEBUG, 1374 SPP_FMT "%s input(%s): <%s id=0x%x len=%d", 1375 SPP_ARGS(ifp), cp->name, 1376 sppp_state_name(sp->state[cp->protoidx]), 1377 sppp_cp_type_name (h->type), h->ident, ntohs (h->len)); 1378 if (len > 4) 1379 sppp_print_bytes ((u_char*) (h+1), len-4); 1380 addlog(">\n"); 1381 } 1382 if (len > ntohs (h->len)) 1383 len = ntohs (h->len); 1384 p = (u_char *)(h + 1); 1385 switch (h->type) { 1386 case CONF_REQ: 1387 if (len < 4) { 1388 if (debug) 1389 addlog(SPP_FMT "%s invalid conf-req length %d\n", 1390 SPP_ARGS(ifp), cp->name, 1391 len); 1392 ++ifp->if_ierrors; 1393 break; 1394 } 1395 /* handle states where RCR doesn't get a SCA/SCN */ 1396 switch (sp->state[cp->protoidx]) { 1397 case STATE_CLOSING: 1398 case STATE_STOPPING: 1399 return; 1400 case STATE_CLOSED: 1401 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1402 0, 0); 1403 return; 1404 } 1405 rv = (cp->RCR)(sp, h, len); 1406 /* silently drop illegal packets */ 1407 if (rv == -1) 1408 return; 1409 switch (sp->state[cp->protoidx]) { 1410 case STATE_OPENED: 1411 sppp_cp_change_state(cp, sp, rv? 1412 STATE_ACK_SENT: STATE_REQ_SENT); 1413 (cp->tld)(sp); 1414 (cp->scr)(sp); 1415 break; 1416 case STATE_ACK_SENT: 1417 case STATE_REQ_SENT: 1418 sppp_cp_change_state(cp, sp, rv? 1419 STATE_ACK_SENT: STATE_REQ_SENT); 1420 break; 1421 case STATE_STOPPED: 1422 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1423 sppp_cp_change_state(cp, sp, rv? 1424 STATE_ACK_SENT: STATE_REQ_SENT); 1425 (cp->scr)(sp); 1426 break; 1427 case STATE_ACK_RCVD: 1428 if (rv) { 1429 sppp_cp_change_state(cp, sp, STATE_OPENED); 1430 if (debug) 1431 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1432 SPP_ARGS(ifp), 1433 cp->name); 1434 (cp->tlu)(sp); 1435 } else 1436 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1437 break; 1438 default: 1439 /* printf(SPP_FMT "%s illegal %s in state %s\n", 1440 SPP_ARGS(ifp), cp->name, 1441 sppp_cp_type_name(h->type), 1442 sppp_state_name(sp->state[cp->protoidx])); */ 1443 ++ifp->if_ierrors; 1444 } 1445 break; 1446 case CONF_ACK: 1447 if (h->ident != sp->confid[cp->protoidx]) { 1448 if (debug) 1449 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1450 SPP_ARGS(ifp), cp->name, 1451 h->ident, sp->confid[cp->protoidx]); 1452 ++ifp->if_ierrors; 1453 break; 1454 } 1455 switch (sp->state[cp->protoidx]) { 1456 case STATE_CLOSED: 1457 case STATE_STOPPED: 1458 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1459 break; 1460 case STATE_CLOSING: 1461 case STATE_STOPPING: 1462 break; 1463 case STATE_REQ_SENT: 1464 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1465 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1466 break; 1467 case STATE_OPENED: 1468 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1469 (cp->tld)(sp); 1470 (cp->scr)(sp); 1471 break; 1472 case STATE_ACK_RCVD: 1473 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1474 (cp->scr)(sp); 1475 break; 1476 case STATE_ACK_SENT: 1477 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1478 sppp_cp_change_state(cp, sp, STATE_OPENED); 1479 if (debug) 1480 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1481 SPP_ARGS(ifp), cp->name); 1482 (cp->tlu)(sp); 1483 break; 1484 default: 1485 /* printf(SPP_FMT "%s illegal %s in state %s\n", 1486 SPP_ARGS(ifp), cp->name, 1487 sppp_cp_type_name(h->type), 1488 sppp_state_name(sp->state[cp->protoidx])); */ 1489 ++ifp->if_ierrors; 1490 } 1491 break; 1492 case CONF_NAK: 1493 case CONF_REJ: 1494 if (h->ident != sp->confid[cp->protoidx]) { 1495 if (debug) 1496 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1497 SPP_ARGS(ifp), cp->name, 1498 h->ident, sp->confid[cp->protoidx]); 1499 ++ifp->if_ierrors; 1500 break; 1501 } 1502 if (h->type == CONF_NAK) 1503 (cp->RCN_nak)(sp, h, len); 1504 else /* CONF_REJ */ 1505 (cp->RCN_rej)(sp, h, len); 1506 1507 switch (sp->state[cp->protoidx]) { 1508 case STATE_CLOSED: 1509 case STATE_STOPPED: 1510 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1511 break; 1512 case STATE_REQ_SENT: 1513 case STATE_ACK_SENT: 1514 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1515 (cp->scr)(sp); 1516 break; 1517 case STATE_OPENED: 1518 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1519 (cp->tld)(sp); 1520 (cp->scr)(sp); 1521 break; 1522 case STATE_ACK_RCVD: 1523 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1524 (cp->scr)(sp); 1525 break; 1526 case STATE_CLOSING: 1527 case STATE_STOPPING: 1528 break; 1529 default: 1530 /* printf(SPP_FMT "%s illegal %s in state %s\n", 1531 SPP_ARGS(ifp), cp->name, 1532 sppp_cp_type_name(h->type), 1533 sppp_state_name(sp->state[cp->protoidx])); */ 1534 ++ifp->if_ierrors; 1535 } 1536 break; 1537 1538 case TERM_REQ: 1539 switch (sp->state[cp->protoidx]) { 1540 case STATE_ACK_RCVD: 1541 case STATE_ACK_SENT: 1542 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1543 /* FALLTHROUGH */ 1544 case STATE_CLOSED: 1545 case STATE_STOPPED: 1546 case STATE_CLOSING: 1547 case STATE_STOPPING: 1548 case STATE_REQ_SENT: 1549 sta: 1550 /* Send Terminate-Ack packet. */ 1551 if (debug) 1552 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n", 1553 SPP_ARGS(ifp), cp->name); 1554 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1555 break; 1556 case STATE_OPENED: 1557 sp->rst_counter[cp->protoidx] = 0; 1558 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1559 (cp->tld)(sp); 1560 goto sta; 1561 break; 1562 default: 1563 /* printf(SPP_FMT "%s illegal %s in state %s\n", 1564 SPP_ARGS(ifp), cp->name, 1565 sppp_cp_type_name(h->type), 1566 sppp_state_name(sp->state[cp->protoidx])); */ 1567 ++ifp->if_ierrors; 1568 } 1569 break; 1570 case TERM_ACK: 1571 switch (sp->state[cp->protoidx]) { 1572 case STATE_CLOSED: 1573 case STATE_STOPPED: 1574 case STATE_REQ_SENT: 1575 case STATE_ACK_SENT: 1576 break; 1577 case STATE_CLOSING: 1578 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1579 (cp->tlf)(sp); 1580 break; 1581 case STATE_STOPPING: 1582 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1583 (cp->tlf)(sp); 1584 break; 1585 case STATE_ACK_RCVD: 1586 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1587 break; 1588 case STATE_OPENED: 1589 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1590 (cp->tld)(sp); 1591 (cp->scr)(sp); 1592 break; 1593 default: 1594 /* printf(SPP_FMT "%s illegal %s in state %s\n", 1595 SPP_ARGS(ifp), cp->name, 1596 sppp_cp_type_name(h->type), 1597 sppp_state_name(sp->state[cp->protoidx])); */ 1598 ++ifp->if_ierrors; 1599 } 1600 break; 1601 case CODE_REJ: 1602 case PROTO_REJ: 1603 { 1604 int catastrophic = 0; 1605 const struct cp *upper = NULL; 1606 int i; 1607 u_int16_t proto; 1608 1609 if (len < 2) { 1610 if (debug) 1611 log(LOG_DEBUG, SPP_FMT "invalid proto-rej length\n", 1612 SPP_ARGS(ifp)); 1613 ++ifp->if_ierrors; 1614 break; 1615 } 1616 1617 proto = ntohs(*((u_int16_t *)p)); 1618 for (i = 0; i < IDX_COUNT; i++) { 1619 if (cps[i]->proto == proto) { 1620 upper = cps[i]; 1621 break; 1622 } 1623 } 1624 if (upper == NULL) 1625 catastrophic++; 1626 1627 if (catastrophic || debug) 1628 log(catastrophic? LOG_INFO: LOG_DEBUG, 1629 SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1630 SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+', 1631 sppp_cp_type_name(h->type), proto, 1632 upper ? upper->name : "unknown", 1633 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1634 1635 /* 1636 * if we got RXJ+ against conf-req, the peer does not implement 1637 * this particular protocol type. terminate the protocol. 1638 */ 1639 if (upper) { 1640 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1641 upper->Close(sp); 1642 break; 1643 } 1644 } 1645 1646 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1647 switch (sp->state[cp->protoidx]) { 1648 case STATE_CLOSED: 1649 case STATE_STOPPED: 1650 case STATE_REQ_SENT: 1651 case STATE_ACK_SENT: 1652 case STATE_CLOSING: 1653 case STATE_STOPPING: 1654 case STATE_OPENED: 1655 break; 1656 case STATE_ACK_RCVD: 1657 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1658 break; 1659 default: 1660 /* printf(SPP_FMT "%s illegal %s in state %s\n", 1661 SPP_ARGS(ifp), cp->name, 1662 sppp_cp_type_name(h->type), 1663 sppp_state_name(sp->state[cp->protoidx])); */ 1664 ++ifp->if_ierrors; 1665 } 1666 break; 1667 } 1668 case DISC_REQ: 1669 if (cp->proto != PPP_LCP) 1670 goto illegal; 1671 /* Discard the packet. */ 1672 break; 1673 case ECHO_REQ: 1674 if (cp->proto != PPP_LCP) 1675 goto illegal; 1676 if (sp->state[cp->protoidx] != STATE_OPENED) { 1677 if (debug) 1678 addlog(SPP_FMT "lcp echo req but lcp closed\n", 1679 SPP_ARGS(ifp)); 1680 ++ifp->if_ierrors; 1681 break; 1682 } 1683 if (len < 8) { 1684 if (debug) 1685 addlog(SPP_FMT "invalid lcp echo request " 1686 "packet length: %d bytes\n", 1687 SPP_ARGS(ifp), len); 1688 break; 1689 } 1690 1691 nmagic = (u_long)p[0] << 24 | 1692 (u_long)p[1] << 16 | p[2] << 8 | p[3]; 1693 1694 if (nmagic == sp->lcp.magic) { 1695 /* Line loopback mode detected. */ 1696 log(LOG_INFO, SPP_FMT "loopback\n", SPP_ARGS(ifp)); 1697 /* Shut down the PPP link. */ 1698 lcp.Close(sp); 1699 break; 1700 } 1701 1702 p[0] = sp->lcp.magic >> 24; 1703 p[1] = sp->lcp.magic >> 16; 1704 p[2] = sp->lcp.magic >> 8; 1705 p[3] = sp->lcp.magic; 1706 1707 if (debug) 1708 addlog(SPP_FMT "got lcp echo req, sending echo rep\n", 1709 SPP_ARGS(ifp)); 1710 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1); 1711 break; 1712 case ECHO_REPLY: 1713 if (cp->proto != PPP_LCP) 1714 goto illegal; 1715 if (h->ident != sp->lcp.echoid) { 1716 ++ifp->if_ierrors; 1717 break; 1718 } 1719 if (len < 8) { 1720 if (debug) 1721 addlog(SPP_FMT "lcp invalid echo reply " 1722 "packet length: %d bytes\n", 1723 SPP_ARGS(ifp), len); 1724 break; 1725 } 1726 if (debug) 1727 addlog(SPP_FMT "lcp got echo rep\n", 1728 SPP_ARGS(ifp)); 1729 1730 nmagic = (u_long)p[0] << 24 | 1731 (u_long)p[1] << 16 | p[2] << 8 | p[3]; 1732 1733 if (nmagic != sp->lcp.magic) 1734 sp->pp_alivecnt = 0; 1735 break; 1736 default: 1737 /* Unknown packet type -- send Code-Reject packet. */ 1738 illegal: 1739 if (debug) 1740 addlog(SPP_FMT "%s send code-rej for 0x%x\n", 1741 SPP_ARGS(ifp), cp->name, h->type); 1742 sppp_cp_send(sp, cp->proto, CODE_REJ, ++sp->pp_seq, 1743 m->m_pkthdr.len, h); 1744 ++ifp->if_ierrors; 1745 } 1746 } 1747 1748 1749 /* 1750 * The generic part of all Up/Down/Open/Close/TO event handlers. 1751 * Basically, the state transition handling in the automaton. 1752 */ 1753 HIDE void 1754 sppp_up_event(const struct cp *cp, struct sppp *sp) 1755 { 1756 STDDCL; 1757 1758 if (debug) 1759 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n", 1760 SPP_ARGS(ifp), cp->name, 1761 sppp_state_name(sp->state[cp->protoidx])); 1762 1763 switch (sp->state[cp->protoidx]) { 1764 case STATE_INITIAL: 1765 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1766 break; 1767 case STATE_STARTING: 1768 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1769 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1770 (cp->scr)(sp); 1771 break; 1772 default: 1773 /* printf(SPP_FMT "%s illegal up in state %s\n", 1774 SPP_ARGS(ifp), cp->name, 1775 sppp_state_name(sp->state[cp->protoidx])); */ 1776 break; 1777 } 1778 } 1779 1780 HIDE void 1781 sppp_down_event(const struct cp *cp, struct sppp *sp) 1782 { 1783 STDDCL; 1784 1785 if (debug) 1786 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n", 1787 SPP_ARGS(ifp), cp->name, 1788 sppp_state_name(sp->state[cp->protoidx])); 1789 1790 switch (sp->state[cp->protoidx]) { 1791 case STATE_CLOSED: 1792 case STATE_CLOSING: 1793 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1794 break; 1795 case STATE_STOPPED: 1796 sppp_cp_change_state(cp, sp, STATE_STARTING); 1797 (cp->tls)(sp); 1798 break; 1799 case STATE_STOPPING: 1800 case STATE_REQ_SENT: 1801 case STATE_ACK_RCVD: 1802 case STATE_ACK_SENT: 1803 sppp_cp_change_state(cp, sp, STATE_STARTING); 1804 break; 1805 case STATE_OPENED: 1806 sppp_cp_change_state(cp, sp, STATE_STARTING); 1807 (cp->tld)(sp); 1808 break; 1809 default: 1810 /* printf(SPP_FMT "%s illegal down in state %s\n", 1811 SPP_ARGS(ifp), cp->name, 1812 sppp_state_name(sp->state[cp->protoidx])); */ 1813 break; 1814 } 1815 } 1816 1817 1818 HIDE void 1819 sppp_open_event(const struct cp *cp, struct sppp *sp) 1820 { 1821 STDDCL; 1822 1823 if (debug) 1824 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n", 1825 SPP_ARGS(ifp), cp->name, 1826 sppp_state_name(sp->state[cp->protoidx])); 1827 1828 switch (sp->state[cp->protoidx]) { 1829 case STATE_INITIAL: 1830 sppp_cp_change_state(cp, sp, STATE_STARTING); 1831 (cp->tls)(sp); 1832 break; 1833 case STATE_STARTING: 1834 break; 1835 case STATE_CLOSED: 1836 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1837 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1838 (cp->scr)(sp); 1839 break; 1840 case STATE_STOPPED: 1841 case STATE_STOPPING: 1842 case STATE_REQ_SENT: 1843 case STATE_ACK_RCVD: 1844 case STATE_ACK_SENT: 1845 case STATE_OPENED: 1846 break; 1847 case STATE_CLOSING: 1848 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1849 break; 1850 } 1851 } 1852 1853 1854 HIDE void 1855 sppp_close_event(const struct cp *cp, struct sppp *sp) 1856 { 1857 STDDCL; 1858 1859 if (debug) 1860 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n", 1861 SPP_ARGS(ifp), cp->name, 1862 sppp_state_name(sp->state[cp->protoidx])); 1863 1864 switch (sp->state[cp->protoidx]) { 1865 case STATE_INITIAL: 1866 case STATE_CLOSED: 1867 case STATE_CLOSING: 1868 break; 1869 case STATE_STARTING: 1870 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1871 (cp->tlf)(sp); 1872 break; 1873 case STATE_STOPPED: 1874 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1875 break; 1876 case STATE_STOPPING: 1877 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1878 break; 1879 case STATE_OPENED: 1880 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1881 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1882 sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq, 0, 0); 1883 (cp->tld)(sp); 1884 break; 1885 case STATE_REQ_SENT: 1886 case STATE_ACK_RCVD: 1887 case STATE_ACK_SENT: 1888 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1889 sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq, 0, 0); 1890 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1891 break; 1892 } 1893 } 1894 1895 HIDE void 1896 sppp_increasing_timeout (const struct cp *cp, struct sppp *sp) 1897 { 1898 int timo; 1899 1900 timo = sp->lcp.max_configure - sp->rst_counter[cp->protoidx]; 1901 if (timo < 1) 1902 timo = 1; 1903 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1904 sp->ch[cp->protoidx] = 1905 timeout(cp->TO, (void *)sp, timo * sp->lcp.timeout); 1906 #elif defined(__OpenBSD__) 1907 timeout_add(&sp->ch[cp->protoidx], timo * sp->lcp.timeout); 1908 #endif 1909 } 1910 1911 HIDE void 1912 sppp_to_event(const struct cp *cp, struct sppp *sp) 1913 { 1914 STDDCL; 1915 int s; 1916 1917 s = splnet(); 1918 if (debug) 1919 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n", 1920 SPP_ARGS(ifp), cp->name, 1921 sppp_state_name(sp->state[cp->protoidx]), 1922 sp->rst_counter[cp->protoidx]); 1923 1924 if (--sp->rst_counter[cp->protoidx] < 0) 1925 /* TO- event */ 1926 switch (sp->state[cp->protoidx]) { 1927 case STATE_CLOSING: 1928 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1929 (cp->tlf)(sp); 1930 break; 1931 case STATE_STOPPING: 1932 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1933 (cp->tlf)(sp); 1934 break; 1935 case STATE_REQ_SENT: 1936 case STATE_ACK_RCVD: 1937 case STATE_ACK_SENT: 1938 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1939 (cp->tlf)(sp); 1940 break; 1941 } 1942 else 1943 /* TO+ event */ 1944 switch (sp->state[cp->protoidx]) { 1945 case STATE_CLOSING: 1946 case STATE_STOPPING: 1947 sppp_cp_send(sp, cp->proto, TERM_REQ, ++sp->pp_seq, 1948 0, 0); 1949 sppp_increasing_timeout (cp, sp); 1950 break; 1951 case STATE_REQ_SENT: 1952 case STATE_ACK_RCVD: 1953 /* sppp_cp_change_state() will restart the timer */ 1954 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1955 (cp->scr)(sp); 1956 break; 1957 case STATE_ACK_SENT: 1958 sppp_increasing_timeout (cp, sp); 1959 (cp->scr)(sp); 1960 break; 1961 } 1962 1963 splx(s); 1964 } 1965 1966 /* 1967 * Change the state of a control protocol in the state automaton. 1968 * Takes care of starting/stopping the restart timer. 1969 */ 1970 void 1971 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1972 { 1973 STDDCL; 1974 1975 if (debug && sp->state[cp->protoidx] != newstate) 1976 log(LOG_DEBUG, SPP_FMT "%s %s->%s\n", 1977 SPP_ARGS(ifp), cp->name, 1978 sppp_state_name(sp->state[cp->protoidx]), 1979 sppp_state_name(newstate)); 1980 sp->state[cp->protoidx] = newstate; 1981 1982 switch (newstate) { 1983 case STATE_INITIAL: 1984 case STATE_STARTING: 1985 case STATE_CLOSED: 1986 case STATE_STOPPED: 1987 case STATE_OPENED: 1988 UNTIMEOUT(cp->TO, (void *)sp, sp->ch[cp->protoidx]); 1989 break; 1990 case STATE_CLOSING: 1991 case STATE_STOPPING: 1992 case STATE_REQ_SENT: 1993 case STATE_ACK_RCVD: 1994 case STATE_ACK_SENT: 1995 if (!timeout_pending(&sp->ch[cp->protoidx])) 1996 sppp_increasing_timeout (cp, sp); 1997 break; 1998 } 1999 } 2000 /* 2001 *--------------------------------------------------------------------------* 2002 * * 2003 * The LCP implementation. * 2004 * * 2005 *--------------------------------------------------------------------------* 2006 */ 2007 HIDE void 2008 sppp_lcp_init(struct sppp *sp) 2009 { 2010 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2011 sp->lcp.magic = 0; 2012 sp->state[IDX_LCP] = STATE_INITIAL; 2013 sp->fail_counter[IDX_LCP] = 0; 2014 sp->lcp.protos = 0; 2015 sp->lcp.mru = sp->lcp.their_mru = sp->pp_if.if_mtu; 2016 2017 /* 2018 * Initialize counters and timeout values. Note that we don't 2019 * use the 3 seconds suggested in RFC 1661 since we are likely 2020 * running on a fast link. XXX We should probably implement 2021 * the exponential backoff option. Note that these values are 2022 * relevant for all control protocols, not just LCP only. 2023 */ 2024 sp->lcp.timeout = 1 * hz; 2025 sp->lcp.max_terminate = 2; 2026 sp->lcp.max_configure = 10; 2027 sp->lcp.max_failure = 10; 2028 #if defined (__FreeBSD__) 2029 callout_handle_init(&sp->ch[IDX_LCP]); 2030 #endif 2031 } 2032 2033 HIDE void 2034 sppp_lcp_up(struct sppp *sp) 2035 { 2036 STDDCL; 2037 struct timeval tv; 2038 2039 if (sp->pp_flags & PP_CISCO) { 2040 int s = splsoftnet(); 2041 sp->pp_if.if_link_state = LINK_STATE_UP; 2042 if_link_state_change(&sp->pp_if); 2043 splx(s); 2044 return; 2045 } 2046 2047 sp->pp_alivecnt = 0; 2048 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2049 sp->lcp.magic = 0; 2050 sp->lcp.protos = 0; 2051 sp->lcp.mru = sp->lcp.their_mru = sp->pp_if.if_mtu; 2052 2053 getmicrouptime(&tv); 2054 sp->pp_last_receive = sp->pp_last_activity = tv.tv_sec; 2055 2056 /* 2057 * If this interface is passive or dial-on-demand, and we are 2058 * still in Initial state, it means we've got an incoming 2059 * call. Activate the interface. 2060 */ 2061 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2062 if (debug) 2063 log(LOG_DEBUG, 2064 SPP_FMT "Up event", SPP_ARGS(ifp)); 2065 ifp->if_flags |= IFF_RUNNING; 2066 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2067 if (debug) 2068 addlog("(incoming call)\n"); 2069 sp->pp_flags |= PP_CALLIN; 2070 lcp.Open(sp); 2071 } else if (debug) 2072 addlog("\n"); 2073 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2074 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2075 ifp->if_flags |= IFF_RUNNING; 2076 lcp.Open(sp); 2077 } 2078 2079 sppp_up_event(&lcp, sp); 2080 } 2081 2082 HIDE void 2083 sppp_lcp_down(struct sppp *sp) 2084 { 2085 STDDCL; 2086 2087 if (sp->pp_flags & PP_CISCO) { 2088 int s = splsoftnet(); 2089 sp->pp_if.if_link_state = LINK_STATE_DOWN; 2090 if_link_state_change(&sp->pp_if); 2091 splx(s); 2092 return; 2093 } 2094 2095 sppp_down_event(&lcp, sp); 2096 2097 /* 2098 * If this is neither a dial-on-demand nor a passive 2099 * interface, simulate an ``ifconfig down'' action, so the 2100 * administrator can force a redial by another ``ifconfig 2101 * up''. XXX For leased line operation, should we immediately 2102 * try to reopen the connection here? 2103 */ 2104 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2105 if (debug) 2106 log(LOG_DEBUG, SPP_FMT "Down event (carrier loss), " 2107 "taking interface down.", SPP_ARGS(ifp)); 2108 if_down(ifp); 2109 } else { 2110 if (debug) 2111 log(LOG_DEBUG, SPP_FMT "Down event (carrier loss)\n", 2112 SPP_ARGS(ifp)); 2113 } 2114 2115 if (sp->state[IDX_LCP] != STATE_INITIAL) 2116 lcp.Close(sp); 2117 sp->pp_flags &= ~PP_CALLIN; 2118 ifp->if_flags &= ~IFF_RUNNING; 2119 sppp_flush(ifp); 2120 } 2121 2122 HIDE void 2123 sppp_lcp_open(struct sppp *sp) 2124 { 2125 /* 2126 * If we are authenticator, negotiate LCP_AUTH 2127 */ 2128 if (sp->hisauth.proto != 0) 2129 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2130 else 2131 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2132 sp->pp_flags &= ~PP_NEEDAUTH; 2133 sppp_open_event(&lcp, sp); 2134 } 2135 2136 HIDE void 2137 sppp_lcp_close(struct sppp *sp) 2138 { 2139 sppp_close_event(&lcp, sp); 2140 } 2141 2142 HIDE void 2143 sppp_lcp_TO(void *cookie) 2144 { 2145 sppp_to_event(&lcp, (struct sppp *)cookie); 2146 } 2147 2148 /* 2149 * Analyze a configure request. Return true if it was agreeable, and 2150 * caused action sca, false if it has been rejected or nak'ed, and 2151 * caused action scn. (The return value is used to make the state 2152 * transition decision in the state automaton.) 2153 */ 2154 HIDE int 2155 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2156 { 2157 STDDCL; 2158 u_char *buf, *r, *p; 2159 int origlen, rlen; 2160 u_long nmagic; 2161 u_short authproto; 2162 2163 len -= 4; 2164 origlen = len; 2165 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2166 if (! buf) 2167 return (0); 2168 2169 if (debug) 2170 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ", 2171 SPP_ARGS(ifp)); 2172 2173 /* pass 1: check for things that need to be rejected */ 2174 p = (void*) (h+1); 2175 for (rlen = 0; len > 1; len -= p[1], p += p[1]) { 2176 if (p[1] < 2 || p[1] > len) { 2177 free(buf, M_TEMP); 2178 return (-1); 2179 } 2180 if (debug) 2181 addlog("%s ", sppp_lcp_opt_name(*p)); 2182 switch (*p) { 2183 case LCP_OPT_MAGIC: 2184 /* Magic number. */ 2185 /* FALLTHROUGH, both are same length */ 2186 case LCP_OPT_ASYNC_MAP: 2187 /* Async control character map. */ 2188 if (len >= 6 && p[1] == 6) 2189 continue; 2190 if (debug) 2191 addlog("[invalid] "); 2192 break; 2193 case LCP_OPT_MRU: 2194 /* Maximum receive unit. */ 2195 if (len >= 4 && p[1] == 4) 2196 continue; 2197 if (debug) 2198 addlog("[invalid] "); 2199 break; 2200 case LCP_OPT_AUTH_PROTO: 2201 if (len < 4) { 2202 if (debug) 2203 addlog("[invalid] "); 2204 break; 2205 } 2206 authproto = (p[2] << 8) + p[3]; 2207 if (authproto == PPP_CHAP && p[1] != 5) { 2208 if (debug) 2209 addlog("[invalid chap len] "); 2210 break; 2211 } 2212 if (sp->myauth.proto == 0) { 2213 /* we are not configured to do auth */ 2214 if (debug) 2215 addlog("[not configured] "); 2216 break; 2217 } 2218 /* 2219 * Remote want us to authenticate, remember this, 2220 * so we stay in PHASE_AUTHENTICATE after LCP got 2221 * up. 2222 */ 2223 sp->pp_flags |= PP_NEEDAUTH; 2224 continue; 2225 default: 2226 /* Others not supported. */ 2227 if (debug) 2228 addlog("[rej] "); 2229 break; 2230 } 2231 /* Add the option to rejected list. */ 2232 bcopy (p, r, p[1]); 2233 r += p[1]; 2234 rlen += p[1]; 2235 } 2236 if (rlen) { 2237 if (debug) 2238 addlog(" send conf-rej\n"); 2239 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2240 goto end; 2241 } else if (debug) 2242 addlog("\n"); 2243 2244 /* 2245 * pass 2: check for option values that are unacceptable and 2246 * thus require to be nak'ed. 2247 */ 2248 if (debug) 2249 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ", 2250 SPP_ARGS(ifp)); 2251 2252 p = (void*) (h+1); 2253 len = origlen; 2254 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2255 if (debug) 2256 addlog("%s ", sppp_lcp_opt_name(*p)); 2257 switch (*p) { 2258 case LCP_OPT_MAGIC: 2259 /* Magic number -- extract. */ 2260 nmagic = (u_long)p[2] << 24 | 2261 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 2262 if (nmagic != sp->lcp.magic) { 2263 if (debug) 2264 addlog("0x%lx ", nmagic); 2265 continue; 2266 } 2267 if (debug) 2268 addlog("[glitch] "); 2269 ++sp->pp_loopcnt; 2270 /* 2271 * We negate our magic here, and NAK it. If 2272 * we see it later in an NAK packet, we 2273 * suggest a new one. 2274 */ 2275 nmagic = ~sp->lcp.magic; 2276 /* Gonna NAK it. */ 2277 p[2] = nmagic >> 24; 2278 p[3] = nmagic >> 16; 2279 p[4] = nmagic >> 8; 2280 p[5] = nmagic; 2281 break; 2282 2283 case LCP_OPT_ASYNC_MAP: 2284 /* Async control character map -- check to be zero. */ 2285 if (! p[2] && ! p[3] && ! p[4] && ! p[5]) { 2286 if (debug) 2287 addlog("[empty] "); 2288 continue; 2289 } 2290 if (debug) 2291 addlog("[non-empty] "); 2292 /* suggest a zero one */ 2293 p[2] = p[3] = p[4] = p[5] = 0; 2294 break; 2295 2296 case LCP_OPT_MRU: 2297 /* 2298 * Maximum receive unit. Always agreeable, 2299 * but ignored by now. 2300 */ 2301 sp->lcp.their_mru = p[2] * 256 + p[3]; 2302 if (debug) 2303 addlog("%lu ", sp->lcp.their_mru); 2304 continue; 2305 2306 case LCP_OPT_AUTH_PROTO: 2307 authproto = (p[2] << 8) + p[3]; 2308 if (sp->myauth.proto != authproto) { 2309 /* not agreed, nak */ 2310 if (debug) 2311 addlog("[mine %s != his %s] ", 2312 sppp_proto_name(sp->hisauth.proto), 2313 sppp_proto_name(authproto)); 2314 p[2] = sp->myauth.proto >> 8; 2315 p[3] = sp->myauth.proto; 2316 break; 2317 } 2318 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2319 if (debug) 2320 addlog("[chap not MD5] "); 2321 p[4] = CHAP_MD5; 2322 break; 2323 } 2324 continue; 2325 } 2326 /* Add the option to nak'ed list. */ 2327 bcopy (p, r, p[1]); 2328 r += p[1]; 2329 rlen += p[1]; 2330 } 2331 if (rlen) { 2332 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2333 if (debug) 2334 addlog(" max_failure (%d) exceeded, " 2335 "send conf-rej\n", 2336 sp->lcp.max_failure); 2337 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2338 } else { 2339 if (debug) 2340 addlog(" send conf-nak\n"); 2341 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2342 } 2343 goto end; 2344 } else { 2345 if (debug) 2346 addlog("send conf-ack\n"); 2347 sp->fail_counter[IDX_LCP] = 0; 2348 sp->pp_loopcnt = 0; 2349 sppp_cp_send (sp, PPP_LCP, CONF_ACK, 2350 h->ident, origlen, h+1); 2351 } 2352 2353 end: 2354 free(buf, M_TEMP); 2355 return (rlen == 0); 2356 } 2357 2358 /* 2359 * Analyze the LCP Configure-Reject option list, and adjust our 2360 * negotiation. 2361 */ 2362 HIDE void 2363 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2364 { 2365 STDDCL; 2366 u_char *p; 2367 2368 len -= 4; 2369 2370 if (debug) 2371 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ", 2372 SPP_ARGS(ifp)); 2373 2374 p = (void*) (h+1); 2375 for (; len > 1; len -= p[1], p += p[1]) { 2376 if (p[1] < 2 || p[1] > len) 2377 return; 2378 if (debug) 2379 addlog("%s ", sppp_lcp_opt_name(*p)); 2380 switch (*p) { 2381 case LCP_OPT_MAGIC: 2382 /* Magic number -- can't use it, use 0 */ 2383 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2384 sp->lcp.magic = 0; 2385 break; 2386 case LCP_OPT_MRU: 2387 /* 2388 * Should not be rejected anyway, since we only 2389 * negotiate a MRU if explicitly requested by 2390 * peer. 2391 */ 2392 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2393 break; 2394 case LCP_OPT_AUTH_PROTO: 2395 /* 2396 * Peer doesn't want to authenticate himself, 2397 * deny unless this is a dialout call, and 2398 * AUTHFLAG_NOCALLOUT is set. 2399 */ 2400 if ((sp->pp_flags & PP_CALLIN) == 0 && 2401 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) { 2402 if (debug) 2403 addlog("[don't insist on auth " 2404 "for callout]"); 2405 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2406 break; 2407 } 2408 if (debug) 2409 addlog("[access denied]\n"); 2410 lcp.Close(sp); 2411 break; 2412 } 2413 } 2414 if (debug) 2415 addlog("\n"); 2416 } 2417 2418 /* 2419 * Analyze the LCP Configure-NAK option list, and adjust our 2420 * negotiation. 2421 */ 2422 HIDE void 2423 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2424 { 2425 STDDCL; 2426 u_char *p; 2427 u_long magic; 2428 2429 len -= 4; 2430 2431 if (debug) 2432 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ", 2433 SPP_ARGS(ifp)); 2434 2435 p = (void*) (h+1); 2436 for (; len > 1; len -= p[1], p += p[1]) { 2437 if (p[1] < 2 || p[1] > len) 2438 return; 2439 if (debug) 2440 addlog("%s ", sppp_lcp_opt_name(*p)); 2441 switch (*p) { 2442 case LCP_OPT_MAGIC: 2443 /* Magic number -- renegotiate */ 2444 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2445 len >= 6 && p[1] == 6) { 2446 magic = (u_long)p[2] << 24 | 2447 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 2448 /* 2449 * If the remote magic is our negated one, 2450 * this looks like a loopback problem. 2451 * Suggest a new magic to make sure. 2452 */ 2453 if (magic == ~sp->lcp.magic) { 2454 if (debug) 2455 addlog("magic glitch "); 2456 sp->lcp.magic = arc4random(); 2457 } else { 2458 sp->lcp.magic = magic; 2459 if (debug) 2460 addlog("%lu ", magic); 2461 } 2462 } 2463 break; 2464 case LCP_OPT_MRU: 2465 /* 2466 * Peer wants to advise us to negotiate an MRU. 2467 * Agree on it if it's reasonable, or use 2468 * default otherwise. 2469 */ 2470 if (len >= 4 && p[1] == 4) { 2471 u_int mru = p[2] * 256 + p[3]; 2472 if (debug) 2473 addlog("%d ", mru); 2474 if (mru < PP_MIN_MRU) 2475 mru = PP_MIN_MRU; 2476 if (mru > PP_MAX_MRU) 2477 mru = PP_MAX_MRU; 2478 sp->lcp.mru = mru; 2479 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2480 } 2481 break; 2482 case LCP_OPT_AUTH_PROTO: 2483 /* 2484 * Peer doesn't like our authentication method, 2485 * deny. 2486 */ 2487 if (debug) 2488 addlog("[access denied]\n"); 2489 lcp.Close(sp); 2490 break; 2491 } 2492 } 2493 if (debug) 2494 addlog("\n"); 2495 } 2496 2497 HIDE void 2498 sppp_lcp_tlu(struct sppp *sp) 2499 { 2500 struct ifnet *ifp = &sp->pp_if; 2501 int i; 2502 u_long mask; 2503 2504 /* XXX ? */ 2505 if (! (ifp->if_flags & IFF_UP) && 2506 (ifp->if_flags & IFF_RUNNING)) { 2507 /* Coming out of loopback mode. */ 2508 if_up(ifp); 2509 if (ifp->if_flags & IFF_DEBUG) 2510 log(LOG_INFO, SPP_FMT "up\n", SPP_ARGS(ifp)); 2511 } 2512 2513 for (i = 0; i < IDX_COUNT; i++) 2514 if ((cps[i])->flags & CP_QUAL) 2515 (cps[i])->Open(sp); 2516 2517 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2518 (sp->pp_flags & PP_NEEDAUTH) != 0) 2519 sp->pp_phase = PHASE_AUTHENTICATE; 2520 else 2521 sp->pp_phase = PHASE_NETWORK; 2522 2523 sppp_set_phase(sp); 2524 2525 /* 2526 * Open all authentication protocols. This is even required 2527 * if we already proceeded to network phase, since it might be 2528 * that remote wants us to authenticate, so we might have to 2529 * send a PAP request. Undesired authentication protocols 2530 * don't do anything when they get an Open event. 2531 */ 2532 for (i = 0; i < IDX_COUNT; i++) 2533 if ((cps[i])->flags & CP_AUTH) 2534 (cps[i])->Open(sp); 2535 2536 if (sp->pp_phase == PHASE_NETWORK) { 2537 /* Notify all NCPs. */ 2538 for (i = 0; i < IDX_COUNT; i++) 2539 if ((cps[i])->flags & CP_NCP) 2540 (cps[i])->Open(sp); 2541 } 2542 2543 /* Send Up events to all started protos. */ 2544 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2545 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0) 2546 (cps[i])->Up(sp); 2547 2548 /* notify low-level driver of state change */ 2549 if (sp->pp_chg) 2550 sp->pp_chg(sp, (int)sp->pp_phase); 2551 2552 if (sp->pp_phase == PHASE_NETWORK) 2553 /* if no NCP is starting, close down */ 2554 sppp_lcp_check_and_close(sp); 2555 } 2556 2557 HIDE void 2558 sppp_lcp_tld(struct sppp *sp) 2559 { 2560 int i; 2561 u_long mask; 2562 2563 sp->pp_phase = PHASE_TERMINATE; 2564 2565 sppp_set_phase(sp); 2566 2567 /* 2568 * Take upper layers down. We send the Down event first and 2569 * the Close second to prevent the upper layers from sending 2570 * ``a flurry of terminate-request packets'', as the RFC 2571 * describes it. 2572 */ 2573 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2574 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0) { 2575 (cps[i])->Down(sp); 2576 (cps[i])->Close(sp); 2577 } 2578 } 2579 2580 HIDE void 2581 sppp_lcp_tls(struct sppp *sp) 2582 { 2583 sp->pp_phase = PHASE_ESTABLISH; 2584 2585 sppp_set_phase(sp); 2586 2587 /* Notify lower layer if desired. */ 2588 if (sp->pp_tls) 2589 (sp->pp_tls)(sp); 2590 } 2591 2592 HIDE void 2593 sppp_lcp_tlf(struct sppp *sp) 2594 { 2595 sp->pp_phase = PHASE_DEAD; 2596 sppp_set_phase(sp); 2597 2598 /* Notify lower layer if desired. */ 2599 if (sp->pp_tlf) 2600 (sp->pp_tlf)(sp); 2601 } 2602 2603 HIDE void 2604 sppp_lcp_scr(struct sppp *sp) 2605 { 2606 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2607 int i = 0; 2608 u_short authproto; 2609 2610 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2611 if (! sp->lcp.magic) 2612 #if defined (__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) 2613 sp->lcp.magic = arc4random(); 2614 #else 2615 sp->lcp.magic = time.tv_sec + time.tv_usec; 2616 #endif 2617 opt[i++] = LCP_OPT_MAGIC; 2618 opt[i++] = 6; 2619 opt[i++] = sp->lcp.magic >> 24; 2620 opt[i++] = sp->lcp.magic >> 16; 2621 opt[i++] = sp->lcp.magic >> 8; 2622 opt[i++] = sp->lcp.magic; 2623 } 2624 2625 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2626 opt[i++] = LCP_OPT_MRU; 2627 opt[i++] = 4; 2628 opt[i++] = sp->lcp.mru >> 8; 2629 opt[i++] = sp->lcp.mru; 2630 } 2631 2632 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2633 authproto = sp->hisauth.proto; 2634 opt[i++] = LCP_OPT_AUTH_PROTO; 2635 opt[i++] = authproto == PPP_CHAP? 5: 4; 2636 opt[i++] = authproto >> 8; 2637 opt[i++] = authproto; 2638 if (authproto == PPP_CHAP) 2639 opt[i++] = CHAP_MD5; 2640 } 2641 2642 sp->confid[IDX_LCP] = ++sp->pp_seq; 2643 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, opt); 2644 } 2645 2646 /* 2647 * Check the open NCPs, return true if at least one NCP is open. 2648 */ 2649 HIDE int 2650 sppp_ncp_check(struct sppp *sp) 2651 { 2652 int i, mask; 2653 2654 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2655 if (sp->lcp.protos & mask && (cps[i])->flags & CP_NCP) 2656 return 1; 2657 return 0; 2658 } 2659 2660 /* 2661 * Re-check the open NCPs and see if we should terminate the link. 2662 * Called by the NCPs during their tlf action handling. 2663 */ 2664 HIDE void 2665 sppp_lcp_check_and_close(struct sppp *sp) 2666 { 2667 2668 if (sp->pp_phase < PHASE_NETWORK) 2669 /* don't bother, we are already going down */ 2670 return; 2671 2672 if (sppp_ncp_check(sp)) 2673 return; 2674 2675 lcp.Close(sp); 2676 } 2677 /* 2678 *--------------------------------------------------------------------------* 2679 * * 2680 * The IPCP implementation. * 2681 * * 2682 *--------------------------------------------------------------------------* 2683 */ 2684 2685 HIDE void 2686 sppp_ipcp_init(struct sppp *sp) 2687 { 2688 sp->ipcp.opts = 0; 2689 sp->ipcp.flags = 0; 2690 sp->state[IDX_IPCP] = STATE_INITIAL; 2691 sp->fail_counter[IDX_IPCP] = 0; 2692 #if defined (__FreeBSD__) 2693 callout_handle_init(&sp->ch[IDX_IPCP]); 2694 #endif 2695 } 2696 2697 HIDE void 2698 sppp_ipcp_up(struct sppp *sp) 2699 { 2700 sppp_up_event(&ipcp, sp); 2701 } 2702 2703 HIDE void 2704 sppp_ipcp_down(struct sppp *sp) 2705 { 2706 sppp_down_event(&ipcp, sp); 2707 } 2708 2709 HIDE void 2710 sppp_ipcp_open(struct sppp *sp) 2711 { 2712 sppp_open_event(&ipcp, sp); 2713 } 2714 2715 HIDE void 2716 sppp_ipcp_close(struct sppp *sp) 2717 { 2718 sppp_close_event(&ipcp, sp); 2719 } 2720 2721 HIDE void 2722 sppp_ipcp_TO(void *cookie) 2723 { 2724 sppp_to_event(&ipcp, (struct sppp *)cookie); 2725 } 2726 2727 /* 2728 * Analyze a configure request. Return true if it was agreeable, and 2729 * caused action sca, false if it has been rejected or nak'ed, and 2730 * caused action scn. (The return value is used to make the state 2731 * transition decision in the state automaton.) 2732 */ 2733 HIDE int 2734 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2735 { 2736 u_char *buf, *r, *p; 2737 struct ifnet *ifp = &sp->pp_if; 2738 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2739 u_int32_t hisaddr, desiredaddr; 2740 2741 len -= 4; 2742 origlen = len; 2743 /* 2744 * Make sure to allocate a buf that can at least hold a 2745 * conf-nak with an `address' option. We might need it below. 2746 */ 2747 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2748 if (! buf) 2749 return (0); 2750 2751 /* pass 1: see if we can recognize them */ 2752 if (debug) 2753 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ", 2754 SPP_ARGS(ifp)); 2755 p = (void*) (h+1); 2756 for (rlen = 0; len > 1; len -= p[1], p += p[1]) { 2757 if (p[1] < 2 || p[1] > len) { 2758 free(buf, M_TEMP); 2759 return (-1); 2760 } 2761 if (debug) 2762 addlog("%s ", sppp_ipcp_opt_name(*p)); 2763 switch (*p) { 2764 #ifdef notyet 2765 case IPCP_OPT_COMPRESSION: 2766 if (len >= 6 && p[1] >= 6) { 2767 /* correctly formed compress option */ 2768 continue; 2769 } 2770 if (debug) 2771 addlog("[invalid] "); 2772 break; 2773 #endif 2774 case IPCP_OPT_ADDRESS: 2775 if (len >= 6 && p[1] == 6) { 2776 /* correctly formed address option */ 2777 continue; 2778 } 2779 if (debug) 2780 addlog("[invalid] "); 2781 break; 2782 default: 2783 /* Others not supported. */ 2784 if (debug) 2785 addlog("[rej] "); 2786 break; 2787 } 2788 /* Add the option to rejected list. */ 2789 bcopy (p, r, p[1]); 2790 r += p[1]; 2791 rlen += p[1]; 2792 } 2793 if (rlen) { 2794 if (debug) 2795 addlog(" send conf-rej\n"); 2796 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2797 goto end; 2798 } else if (debug) 2799 addlog("\n"); 2800 2801 /* pass 2: parse option values */ 2802 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2803 hisaddr = sp->ipcp.req_hisaddr; /* we already agreed on that */ 2804 else 2805 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2806 if (debug) 2807 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ", 2808 SPP_ARGS(ifp)); 2809 p = (void*) (h+1); 2810 len = origlen; 2811 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2812 if (debug) 2813 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2814 switch (*p) { 2815 #ifdef notyet 2816 case IPCP_OPT_COMPRESSION: 2817 continue; 2818 #endif 2819 case IPCP_OPT_ADDRESS: 2820 desiredaddr = p[2] << 24 | p[3] << 16 | 2821 p[4] << 8 | p[5]; 2822 if (desiredaddr == hisaddr || 2823 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && 2824 desiredaddr != 0)) { 2825 /* 2826 * Peer's address is same as our value, 2827 * or we have set it to 0.0.0.1 to 2828 * indicate that we do not really care, 2829 * this is agreeable. Gonna conf-ack 2830 * it. 2831 */ 2832 if (debug) 2833 addlog("%s [ack] ", 2834 sppp_dotted_quad(desiredaddr)); 2835 /* record that we've seen it already */ 2836 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2837 sp->ipcp.req_hisaddr = desiredaddr; 2838 hisaddr = desiredaddr; 2839 continue; 2840 } 2841 /* 2842 * The address wasn't agreeable. This is either 2843 * he sent us 0.0.0.0, asking to assign him an 2844 * address, or he send us another address not 2845 * matching our value. Either case, we gonna 2846 * conf-nak it with our value. 2847 */ 2848 if (debug) { 2849 if (desiredaddr == 0) 2850 addlog("[addr requested] "); 2851 else 2852 addlog("%s [not agreed] ", 2853 sppp_dotted_quad(desiredaddr)); 2854 } 2855 2856 p[2] = hisaddr >> 24; 2857 p[3] = hisaddr >> 16; 2858 p[4] = hisaddr >> 8; 2859 p[5] = hisaddr; 2860 break; 2861 } 2862 /* Add the option to nak'ed list. */ 2863 bcopy (p, r, p[1]); 2864 r += p[1]; 2865 rlen += p[1]; 2866 } 2867 2868 /* 2869 * If we are about to conf-ack the request, but haven't seen 2870 * his address so far, gonna conf-nak it instead, with the 2871 * `address' option present and our idea of his address being 2872 * filled in there, to request negotiation of both addresses. 2873 * 2874 * XXX This can result in an endless req - nak loop if peer 2875 * doesn't want to send us his address. Q: What should we do 2876 * about it? XXX A: implement the max-failure counter. 2877 */ 2878 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2879 buf[0] = IPCP_OPT_ADDRESS; 2880 buf[1] = 6; 2881 buf[2] = hisaddr >> 24; 2882 buf[3] = hisaddr >> 16; 2883 buf[4] = hisaddr >> 8; 2884 buf[5] = hisaddr; 2885 rlen = 6; 2886 if (debug) 2887 addlog("still need hisaddr "); 2888 } 2889 2890 if (rlen) { 2891 if (debug) 2892 addlog(" send conf-nak\n"); 2893 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2894 } else { 2895 if (debug) 2896 addlog(" send conf-ack\n"); 2897 sppp_cp_send (sp, PPP_IPCP, CONF_ACK, 2898 h->ident, origlen, h+1); 2899 } 2900 2901 end: 2902 free(buf, M_TEMP); 2903 return (rlen == 0); 2904 } 2905 2906 /* 2907 * Analyze the IPCP Configure-Reject option list, and adjust our 2908 * negotiation. 2909 */ 2910 HIDE void 2911 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2912 { 2913 u_char *p; 2914 struct ifnet *ifp = &sp->pp_if; 2915 int debug = ifp->if_flags & IFF_DEBUG; 2916 2917 len -= 4; 2918 2919 if (debug) 2920 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ", 2921 SPP_ARGS(ifp)); 2922 2923 p = (void*) (h+1); 2924 for (; len > 1; len -= p[1], p += p[1]) { 2925 if (p[1] < 2 || p[1] > len) 2926 return; 2927 if (debug) 2928 addlog("%s ", sppp_ipcp_opt_name(*p)); 2929 switch (*p) { 2930 case IPCP_OPT_ADDRESS: 2931 /* 2932 * Peer doesn't grok address option. This is 2933 * bad. XXX Should we better give up here? 2934 */ 2935 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 2936 break; 2937 #ifdef notyet 2938 case IPCP_OPT_COMPRESS: 2939 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 2940 break; 2941 #endif 2942 } 2943 } 2944 if (debug) 2945 addlog("\n"); 2946 } 2947 2948 /* 2949 * Analyze the IPCP Configure-NAK option list, and adjust our 2950 * negotiation. 2951 */ 2952 HIDE void 2953 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2954 { 2955 u_char *p; 2956 struct ifnet *ifp = &sp->pp_if; 2957 int debug = ifp->if_flags & IFF_DEBUG; 2958 u_int32_t wantaddr; 2959 2960 len -= 4; 2961 2962 if (debug) 2963 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ", 2964 SPP_ARGS(ifp)); 2965 2966 p = (void*) (h+1); 2967 for (; len > 1; len -= p[1], p += p[1]) { 2968 if (p[1] < 2 || p[1] > len) 2969 return; 2970 if (debug) 2971 addlog("%s ", sppp_ipcp_opt_name(*p)); 2972 switch (*p) { 2973 case IPCP_OPT_ADDRESS: 2974 /* 2975 * Peer doesn't like our local IP address. See 2976 * if we can do something for him. We'll drop 2977 * him our address then. 2978 */ 2979 if (len >= 6 && p[1] == 6) { 2980 wantaddr = p[2] << 24 | p[3] << 16 | 2981 p[4] << 8 | p[5]; 2982 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2983 if (debug) 2984 addlog("[wantaddr %s] ", 2985 sppp_dotted_quad(wantaddr)); 2986 /* 2987 * When doing dynamic address assignment, 2988 * we accept his offer. Otherwise, we 2989 * ignore it and thus continue to negotiate 2990 * our already existing value. 2991 */ 2992 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 2993 if (debug) 2994 addlog("[agree] "); 2995 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 2996 sp->ipcp.req_myaddr = wantaddr; 2997 } 2998 } 2999 break; 3000 #ifdef notyet 3001 case IPCP_OPT_COMPRESS: 3002 /* 3003 * Peer wants different compression parameters. 3004 */ 3005 break; 3006 #endif 3007 } 3008 } 3009 if (debug) 3010 addlog("\n"); 3011 } 3012 3013 HIDE void 3014 sppp_ipcp_tlu(struct sppp *sp) 3015 { 3016 /* we are up. Set addresses and notify anyone interested */ 3017 u_int32_t myaddr, hisaddr; 3018 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3019 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && 3020 (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3021 myaddr = sp->ipcp.req_myaddr; 3022 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && 3023 (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3024 hisaddr = sp->ipcp.req_hisaddr; 3025 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3026 } 3027 3028 HIDE void 3029 sppp_ipcp_tld(struct sppp *sp) 3030 { 3031 } 3032 3033 HIDE void 3034 sppp_ipcp_tls(struct sppp *sp) 3035 { 3036 STDDCL; 3037 u_int32_t myaddr, hisaddr; 3038 3039 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN| 3040 IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 3041 sp->ipcp.req_myaddr = 0; 3042 sp->ipcp.req_hisaddr = 0; 3043 3044 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3045 /* 3046 * If we don't have his address, this probably means our 3047 * interface doesn't want to talk IP at all. (This could 3048 * be the case if somebody wants to speak only IPX, for 3049 * example.) Don't open IPCP in this case. 3050 */ 3051 if (hisaddr == 0) { 3052 /* XXX this message should go away */ 3053 if (debug) 3054 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n", 3055 SPP_ARGS(ifp)); 3056 return; 3057 } 3058 3059 if (myaddr == 0) { 3060 /* 3061 * I don't have an assigned address, so i need to 3062 * negotiate my address. 3063 */ 3064 sp->ipcp.flags |= IPCP_MYADDR_DYN; 3065 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3066 } 3067 if (hisaddr == 1) { 3068 /* 3069 * XXX - remove this hack! 3070 * remote has no valid address, we need to get one assigned. 3071 */ 3072 sp->ipcp.flags |= IPCP_HISADDR_DYN; 3073 } 3074 3075 /* indicate to LCP that it must stay alive */ 3076 sp->lcp.protos |= (1 << IDX_IPCP); 3077 } 3078 3079 HIDE void 3080 sppp_ipcp_tlf(struct sppp *sp) 3081 { 3082 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 3083 /* Some address was dynamic, clear it again. */ 3084 sppp_clear_ip_addrs(sp); 3085 3086 /* we no longer need LCP */ 3087 sp->lcp.protos &= ~(1 << IDX_IPCP); 3088 sppp_lcp_check_and_close(sp); 3089 } 3090 3091 HIDE void 3092 sppp_ipcp_scr(struct sppp *sp) 3093 { 3094 char opt[6 /* compression */ + 6 /* address */]; 3095 u_int32_t ouraddr; 3096 int i = 0; 3097 3098 #ifdef notyet 3099 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3100 opt[i++] = IPCP_OPT_COMPRESSION; 3101 opt[i++] = 6; 3102 opt[i++] = 0; /* VJ header compression */ 3103 opt[i++] = 0x2d; /* VJ header compression */ 3104 opt[i++] = max_slot_id; 3105 opt[i++] = comp_slot_id; 3106 } 3107 #endif 3108 3109 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3110 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3111 /* not sure if this can ever happen */ 3112 ouraddr = sp->ipcp.req_myaddr; 3113 else 3114 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3115 opt[i++] = IPCP_OPT_ADDRESS; 3116 opt[i++] = 6; 3117 opt[i++] = ouraddr >> 24; 3118 opt[i++] = ouraddr >> 16; 3119 opt[i++] = ouraddr >> 8; 3120 opt[i++] = ouraddr; 3121 } 3122 3123 sp->confid[IDX_IPCP] = ++sp->pp_seq; 3124 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, opt); 3125 } 3126 3127 /* 3128 *--------------------------------------------------------------------------* 3129 * * 3130 * The IPv6CP implementation. * 3131 * * 3132 *--------------------------------------------------------------------------* 3133 */ 3134 3135 #ifdef INET6 3136 HIDE void 3137 sppp_ipv6cp_init(struct sppp *sp) 3138 { 3139 sp->ipv6cp.opts = 0; 3140 sp->ipv6cp.flags = 0; 3141 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3142 sp->fail_counter[IDX_IPV6CP] = 0; 3143 #if defined (__FreeBSD__) 3144 callout_handle_init(&sp->ch[IDX_IPV6CP]); 3145 #endif 3146 } 3147 3148 HIDE void 3149 sppp_ipv6cp_up(struct sppp *sp) 3150 { 3151 sppp_up_event(&ipv6cp, sp); 3152 } 3153 3154 HIDE void 3155 sppp_ipv6cp_down(struct sppp *sp) 3156 { 3157 sppp_down_event(&ipv6cp, sp); 3158 } 3159 3160 HIDE void 3161 sppp_ipv6cp_open(struct sppp *sp) 3162 { 3163 STDDCL; 3164 struct in6_addr myaddr, hisaddr; 3165 3166 #ifdef IPV6CP_MYIFID_DYN 3167 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3168 #else 3169 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3170 #endif 3171 3172 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3173 /* 3174 * If we don't have our address, this probably means our 3175 * interface doesn't want to talk IPv6 at all. (This could 3176 * be the case if somebody wants to speak only IPX, for 3177 * example.) Don't open IPv6CP in this case. 3178 */ 3179 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3180 /* XXX this message should go away */ 3181 if (debug) 3182 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n", 3183 SPP_ARGS(ifp)); 3184 return; 3185 } 3186 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3187 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3188 sppp_open_event(&ipv6cp, sp); 3189 } 3190 3191 HIDE void 3192 sppp_ipv6cp_close(struct sppp *sp) 3193 { 3194 sppp_close_event(&ipv6cp, sp); 3195 } 3196 3197 HIDE void 3198 sppp_ipv6cp_TO(void *cookie) 3199 { 3200 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3201 } 3202 3203 HIDE int 3204 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3205 { 3206 u_char *buf, *r, *p; 3207 struct ifnet *ifp = &sp->pp_if; 3208 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3209 struct in6_addr myaddr, desiredaddr, suggestaddr; 3210 int ifidcount; 3211 int type; 3212 int collision, nohisaddr; 3213 3214 len -= 4; 3215 origlen = len; 3216 /* 3217 * Make sure to allocate a buf that can at least hold a 3218 * conf-nak with an `address' option. We might need it below. 3219 */ 3220 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3221 if (! buf) 3222 return (0); 3223 3224 /* pass 1: see if we can recognize them */ 3225 if (debug) 3226 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3227 SPP_ARGS(ifp)); 3228 p = (void *)(h + 1); 3229 ifidcount = 0; 3230 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3231 /* Sanity check option length */ 3232 if (p[1] < 2 || p[1] > len) { 3233 free(buf, M_TEMP); 3234 return (-1); 3235 } 3236 if (debug) 3237 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3238 switch (*p) { 3239 case IPV6CP_OPT_IFID: 3240 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3241 /* correctly formed address option */ 3242 ifidcount++; 3243 continue; 3244 } 3245 if (debug) 3246 addlog(" [invalid]"); 3247 break; 3248 #ifdef notyet 3249 case IPV6CP_OPT_COMPRESSION: 3250 if (len >= 4 && p[1] >= 4) { 3251 /* correctly formed compress option */ 3252 continue; 3253 } 3254 if (debug) 3255 addlog(" [invalid]"); 3256 break; 3257 #endif 3258 default: 3259 /* Others not supported. */ 3260 if (debug) 3261 addlog(" [rej]"); 3262 break; 3263 } 3264 /* Add the option to rejected list. */ 3265 bcopy (p, r, p[1]); 3266 r += p[1]; 3267 rlen += p[1]; 3268 } 3269 if (rlen) { 3270 if (debug) 3271 addlog(" send conf-rej\n"); 3272 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3273 goto end; 3274 } else if (debug) 3275 addlog("\n"); 3276 3277 /* pass 2: parse option values */ 3278 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3279 if (debug) 3280 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3281 SPP_ARGS(ifp)); 3282 p = (void *)(h + 1); 3283 len = origlen; 3284 type = CONF_ACK; 3285 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3286 if (debug) 3287 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3288 switch (*p) { 3289 #ifdef notyet 3290 case IPV6CP_OPT_COMPRESSION: 3291 continue; 3292 #endif 3293 case IPV6CP_OPT_IFID: 3294 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3295 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3296 collision = (memcmp(&desiredaddr.s6_addr[8], 3297 &myaddr.s6_addr[8], 8) == 0); 3298 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3299 3300 desiredaddr.s6_addr16[0] = htons(0xfe80); 3301 3302 if (!collision && !nohisaddr) { 3303 /* no collision, hisaddr known - Conf-Ack */ 3304 type = CONF_ACK; 3305 3306 if (debug) { 3307 addlog(" %s [%s]", 3308 ip6_sprintf(&desiredaddr), 3309 sppp_cp_type_name(type)); 3310 } 3311 continue; 3312 } 3313 3314 memset(&suggestaddr, 0, sizeof(&suggestaddr)); 3315 if (collision && nohisaddr) { 3316 /* collision, hisaddr unknown - Conf-Rej */ 3317 type = CONF_REJ; 3318 memset(&p[2], 0, 8); 3319 } else { 3320 /* 3321 * - no collision, hisaddr unknown, or 3322 * - collision, hisaddr known 3323 * Conf-Nak, suggest hisaddr 3324 */ 3325 type = CONF_NAK; 3326 sppp_suggest_ip6_addr(sp, &suggestaddr); 3327 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3328 } 3329 if (debug) 3330 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3331 sppp_cp_type_name(type)); 3332 break; 3333 } 3334 /* Add the option to nak'ed list. */ 3335 bcopy (p, r, p[1]); 3336 r += p[1]; 3337 rlen += p[1]; 3338 } 3339 3340 if (rlen == 0 && type == CONF_ACK) { 3341 if (debug) 3342 addlog(" send %s\n", sppp_cp_type_name(type)); 3343 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3344 } else { 3345 #ifdef notdef 3346 if (type == CONF_ACK) 3347 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3348 #endif 3349 3350 if (debug) { 3351 addlog(" send %s suggest %s\n", 3352 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3353 } 3354 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3355 } 3356 3357 end: 3358 free(buf, M_TEMP); 3359 return (rlen == 0); 3360 } 3361 3362 HIDE void 3363 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3364 { 3365 u_char *p; 3366 struct ifnet *ifp = &sp->pp_if; 3367 int debug = ifp->if_flags & IFF_DEBUG; 3368 3369 len -= 4; 3370 3371 if (debug) 3372 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3373 SPP_ARGS(ifp)); 3374 3375 p = (void *)(h + 1); 3376 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3377 if (p[1] < 2 || p[1] > len) 3378 return; 3379 if (debug) 3380 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3381 switch (*p) { 3382 case IPV6CP_OPT_IFID: 3383 /* 3384 * Peer doesn't grok address option. This is 3385 * bad. XXX Should we better give up here? 3386 */ 3387 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3388 break; 3389 #ifdef notyet 3390 case IPV6CP_OPT_COMPRESS: 3391 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3392 break; 3393 #endif 3394 } 3395 } 3396 if (debug) 3397 addlog("\n"); 3398 return; 3399 } 3400 3401 HIDE void 3402 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3403 { 3404 u_char *p; 3405 struct ifnet *ifp = &sp->pp_if; 3406 int debug = ifp->if_flags & IFF_DEBUG; 3407 struct in6_addr suggestaddr; 3408 3409 len -= 4; 3410 3411 if (debug) 3412 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts: ", 3413 SPP_ARGS(ifp)); 3414 3415 p = (void*) (h+1); 3416 for (; len > 1; len -= p[1], p += p[1]) { 3417 if (p[1] < 2 || p[1] > len) 3418 return; 3419 if (debug) 3420 addlog("%s ", sppp_ipv6cp_opt_name(*p)); 3421 switch (*p) { 3422 case IPV6CP_OPT_IFID: 3423 /* 3424 * Peer doesn't like our local ifid. See 3425 * if we can do something for him. We'll drop 3426 * him our address then. 3427 */ 3428 if (len < 10 || p[1] != 10) 3429 break; 3430 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3431 suggestaddr.s6_addr16[0] = htons(0xfe80); 3432 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3433 3434 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3435 if (debug) 3436 addlog(" [suggestaddr %s]", 3437 ip6_sprintf(&suggestaddr)); 3438 #ifdef IPV6CP_MYIFID_DYN 3439 /* 3440 * When doing dynamic address assignment, 3441 * we accept his offer. 3442 */ 3443 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3444 struct in6_addr lastsuggest; 3445 /* 3446 * If <suggested myaddr from peer> equals to 3447 * <hisaddr we have suggested last time>, 3448 * we have a collision. generate new random 3449 * ifid. 3450 */ 3451 sppp_suggest_ip6_addr(sp,&lastsuggest); 3452 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3453 &lastsuggest)) { 3454 if (debug) 3455 addlog(" [random]"); 3456 sppp_gen_ip6_addr(sp, &suggestaddr); 3457 } 3458 sppp_set_ip6_addr(sp, &suggestaddr); 3459 if (debug) 3460 addlog(" [agree]"); 3461 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3462 } 3463 #else 3464 /* 3465 * Since we do not do dynamic address assignment, 3466 * we ignore it and thus continue to negotiate 3467 * our already existing value. This can possibly 3468 * go into infinite request-reject loop. 3469 * 3470 * This is not likely because we normally use 3471 * ifid based on MAC-address. 3472 * If you have no ethernet card on the node, too bad. 3473 * XXX should we use fail_counter? 3474 */ 3475 #endif 3476 break; 3477 #ifdef notyet 3478 case IPV6CP_OPT_COMPRESS: 3479 /* 3480 * Peer wants different compression parameters. 3481 */ 3482 break; 3483 #endif 3484 } 3485 } 3486 if (debug) 3487 addlog("\n"); 3488 } 3489 3490 HIDE void 3491 sppp_ipv6cp_tlu(struct sppp *sp) 3492 { 3493 } 3494 3495 HIDE void 3496 sppp_ipv6cp_tld(struct sppp *sp) 3497 { 3498 } 3499 3500 HIDE void 3501 sppp_ipv6cp_tls(struct sppp *sp) 3502 { 3503 /* indicate to LCP that it must stay alive */ 3504 sp->lcp.protos |= (1 << IDX_IPV6CP); 3505 } 3506 3507 HIDE void 3508 sppp_ipv6cp_tlf(struct sppp *sp) 3509 { 3510 /* we no longer need LCP */ 3511 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3512 sppp_lcp_check_and_close(sp); 3513 } 3514 3515 HIDE void 3516 sppp_ipv6cp_scr(struct sppp *sp) 3517 { 3518 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3519 struct in6_addr ouraddr; 3520 int i = 0; 3521 3522 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3523 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3524 opt[i++] = IPV6CP_OPT_IFID; 3525 opt[i++] = 10; 3526 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3527 i += 8; 3528 } 3529 3530 #ifdef notyet 3531 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3532 opt[i++] = IPV6CP_OPT_COMPRESSION; 3533 opt[i++] = 4; 3534 p opt[i++] = 0; /* TBD */ 3535 opt[i++] = 0; /* TBD */ 3536 /* variable length data may follow */ 3537 } 3538 #endif 3539 3540 sp->confid[IDX_IPV6CP] = ++sp->pp_seq; 3541 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, opt); 3542 } 3543 #else /*INET6*/ 3544 HIDE void 3545 sppp_ipv6cp_init(struct sppp *sp) 3546 { 3547 } 3548 3549 HIDE void 3550 sppp_ipv6cp_up(struct sppp *sp) 3551 { 3552 } 3553 3554 HIDE void 3555 sppp_ipv6cp_down(struct sppp *sp) 3556 { 3557 } 3558 3559 HIDE void 3560 sppp_ipv6cp_open(struct sppp *sp) 3561 { 3562 } 3563 3564 HIDE void 3565 sppp_ipv6cp_close(struct sppp *sp) 3566 { 3567 } 3568 3569 HIDE void 3570 sppp_ipv6cp_TO(void *sp) 3571 { 3572 } 3573 3574 HIDE int 3575 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 3576 int len) 3577 { 3578 return 0; 3579 } 3580 3581 HIDE void 3582 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 3583 int len) 3584 { 3585 } 3586 3587 HIDE void 3588 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 3589 int len) 3590 { 3591 } 3592 3593 HIDE void 3594 sppp_ipv6cp_tlu(struct sppp *sp) 3595 { 3596 } 3597 3598 HIDE void 3599 sppp_ipv6cp_tld(struct sppp *sp) 3600 { 3601 } 3602 3603 HIDE void 3604 sppp_ipv6cp_tls(struct sppp *sp) 3605 { 3606 } 3607 3608 HIDE void 3609 sppp_ipv6cp_tlf(struct sppp *sp) 3610 { 3611 } 3612 3613 HIDE void 3614 sppp_ipv6cp_scr(struct sppp *sp) 3615 { 3616 } 3617 #endif /*INET6*/ 3618 3619 /* 3620 *--------------------------------------------------------------------------* 3621 * * 3622 * The CHAP implementation. * 3623 * * 3624 *--------------------------------------------------------------------------* 3625 */ 3626 3627 /* 3628 * The authentication protocols don't employ a full-fledged state machine as 3629 * the control protocols do, since they do have Open and Close events, but 3630 * not Up and Down, nor are they explicitly terminated. Also, use of the 3631 * authentication protocols may be different in both directions (this makes 3632 * sense, think of a machine that never accepts incoming calls but only 3633 * calls out, it doesn't require the called party to authenticate itself). 3634 * 3635 * Our state machine for the local authentication protocol (we are requesting 3636 * the peer to authenticate) looks like: 3637 * 3638 * RCA- 3639 * +--------------------------------------------+ 3640 * V scn,tld| 3641 * +--------+ Close +---------+ RCA+ 3642 * | |<----------------------------------| |------+ 3643 * +--->| Closed | TO* | Opened | sca | 3644 * | | |-----+ +-------| |<-----+ 3645 * | +--------+ irc | | +---------+ 3646 * | ^ | | ^ 3647 * | | | | | 3648 * | | | | | 3649 * | TO-| | | | 3650 * | |tld TO+ V | | 3651 * | | +------->+ | | 3652 * | | | | | | 3653 * | +--------+ V | | 3654 * | | |<----+<--------------------+ | 3655 * | | Req- | scr | 3656 * | | Sent | | 3657 * | | | | 3658 * | +--------+ | 3659 * | RCA- | | RCA+ | 3660 * +------+ +------------------------------------------+ 3661 * scn,tld sca,irc,ict,tlu 3662 * 3663 * 3664 * with: 3665 * 3666 * Open: LCP reached authentication phase 3667 * Close: LCP reached terminate phase 3668 * 3669 * RCA+: received reply (pap-req, chap-response), acceptable 3670 * RCN: received reply (pap-req, chap-response), not acceptable 3671 * TO+: timeout with restart counter >= 0 3672 * TO-: timeout with restart counter < 0 3673 * TO*: reschedule timeout for CHAP 3674 * 3675 * scr: send request packet (none for PAP, chap-challenge) 3676 * sca: send ack packet (pap-ack, chap-success) 3677 * scn: send nak packet (pap-nak, chap-failure) 3678 * ict: initialize re-challenge timer (CHAP only) 3679 * 3680 * tlu: this-layer-up, LCP reaches network phase 3681 * tld: this-layer-down, LCP enters terminate phase 3682 * 3683 * Note that in CHAP mode, after sending a new challenge, while the state 3684 * automaton falls back into Req-Sent state, it doesn't signal a tld 3685 * event to LCP, so LCP remains in network phase. Only after not getting 3686 * any response (or after getting an unacceptable response), CHAP closes, 3687 * causing LCP to enter terminate phase. 3688 * 3689 * With PAP, there is no initial request that can be sent. The peer is 3690 * expected to send one based on the successful negotiation of PAP as 3691 * the authentication protocol during the LCP option negotiation. 3692 * 3693 * Incoming authentication protocol requests (remote requests 3694 * authentication, we are peer) don't employ a state machine at all, 3695 * they are simply answered. Some peers [Ascend P50 firmware rev 3696 * 4.50] react allergically when sending IPCP requests while they are 3697 * still in authentication phase (thereby violating the standard that 3698 * demands that these NCP packets are to be discarded), so we keep 3699 * track of the peer demanding us to authenticate, and only proceed to 3700 * phase network once we've seen a positive acknowledge for the 3701 * authentication. 3702 */ 3703 3704 /* 3705 * Handle incoming CHAP packets. 3706 */ 3707 void 3708 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3709 { 3710 STDDCL; 3711 struct lcp_header *h; 3712 int len, x; 3713 u_char *value, *name, digest[AUTHCHALEN], dsize; 3714 int value_len, name_len; 3715 MD5_CTX ctx; 3716 3717 len = m->m_pkthdr.len; 3718 if (len < 4) { 3719 if (debug) 3720 log(LOG_DEBUG, 3721 SPP_FMT "chap invalid packet length: %d bytes\n", 3722 SPP_ARGS(ifp), len); 3723 return; 3724 } 3725 h = mtod (m, struct lcp_header*); 3726 if (len > ntohs (h->len)) 3727 len = ntohs (h->len); 3728 3729 switch (h->type) { 3730 /* challenge, failure and success are his authproto */ 3731 case CHAP_CHALLENGE: 3732 value = 1 + (u_char*)(h+1); 3733 value_len = value[-1]; 3734 name = value + value_len; 3735 name_len = len - value_len - 5; 3736 if (name_len < 0) { 3737 if (debug) { 3738 log(LOG_DEBUG, 3739 SPP_FMT "chap corrupted challenge " 3740 "<%s id=0x%x len=%d", 3741 SPP_ARGS(ifp), 3742 sppp_auth_type_name(PPP_CHAP, h->type), 3743 h->ident, ntohs(h->len)); 3744 if (len > 4) 3745 sppp_print_bytes((u_char*) (h+1), len-4); 3746 addlog(">\n"); 3747 } 3748 break; 3749 } 3750 3751 if (debug) { 3752 log(LOG_DEBUG, 3753 SPP_FMT "chap input <%s id=0x%x len=%d name=", 3754 SPP_ARGS(ifp), 3755 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3756 ntohs(h->len)); 3757 sppp_print_string((char*) name, name_len); 3758 addlog(" value-size=%d value=", value_len); 3759 sppp_print_bytes(value, value_len); 3760 addlog(">\n"); 3761 } 3762 3763 /* Compute reply value. */ 3764 MD5Init(&ctx); 3765 MD5Update(&ctx, &h->ident, 1); 3766 MD5Update(&ctx, sp->myauth.secret, 3767 strlen(sp->myauth.secret)); 3768 MD5Update(&ctx, value, value_len); 3769 MD5Final(digest, &ctx); 3770 dsize = sizeof digest; 3771 3772 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3773 sizeof dsize, (const char *)&dsize, 3774 sizeof digest, digest, 3775 strlen(sp->myauth.name), 3776 sp->myauth.name, 3777 0); 3778 break; 3779 3780 case CHAP_SUCCESS: 3781 if (debug) { 3782 log(LOG_DEBUG, SPP_FMT "chap success", 3783 SPP_ARGS(ifp)); 3784 if (len > 4) { 3785 addlog(": "); 3786 sppp_print_string((char*)(h + 1), len - 4); 3787 } 3788 addlog("\n"); 3789 } 3790 x = splnet(); 3791 sp->pp_flags &= ~PP_NEEDAUTH; 3792 if (sp->myauth.proto == PPP_CHAP && 3793 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3794 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3795 /* 3796 * We are authenticator for CHAP but didn't 3797 * complete yet. Leave it to tlu to proceed 3798 * to network phase. 3799 */ 3800 splx(x); 3801 break; 3802 } 3803 splx(x); 3804 sppp_phase_network(sp); 3805 break; 3806 3807 case CHAP_FAILURE: 3808 if (debug) { 3809 log(LOG_INFO, SPP_FMT "chap failure", 3810 SPP_ARGS(ifp)); 3811 if (len > 4) { 3812 addlog(": "); 3813 sppp_print_string((char*)(h + 1), len - 4); 3814 } 3815 addlog("\n"); 3816 } else 3817 log(LOG_INFO, SPP_FMT "chap failure\n", 3818 SPP_ARGS(ifp)); 3819 /* await LCP shutdown by authenticator */ 3820 break; 3821 3822 /* response is my authproto */ 3823 case CHAP_RESPONSE: 3824 value = 1 + (u_char*)(h+1); 3825 value_len = value[-1]; 3826 name = value + value_len; 3827 name_len = len - value_len - 5; 3828 if (name_len < 0) { 3829 if (debug) { 3830 log(LOG_DEBUG, 3831 SPP_FMT "chap corrupted response " 3832 "<%s id=0x%x len=%d", 3833 SPP_ARGS(ifp), 3834 sppp_auth_type_name(PPP_CHAP, h->type), 3835 h->ident, ntohs(h->len)); 3836 if (len > 4) 3837 sppp_print_bytes((u_char*)(h+1), len-4); 3838 addlog(">\n"); 3839 } 3840 break; 3841 } 3842 if (h->ident != sp->confid[IDX_CHAP]) { 3843 if (debug) 3844 log(LOG_DEBUG, 3845 SPP_FMT "chap dropping response for old ID " 3846 "(got %d, expected %d)\n", 3847 SPP_ARGS(ifp), 3848 h->ident, sp->confid[IDX_CHAP]); 3849 break; 3850 } 3851 if (name_len != strlen(sp->hisauth.name) 3852 || bcmp(name, sp->hisauth.name, name_len) != 0) { 3853 log(LOG_INFO, SPP_FMT "chap response, his name ", 3854 SPP_ARGS(ifp)); 3855 sppp_print_string(name, name_len); 3856 addlog(" != expected "); 3857 sppp_print_string(sp->hisauth.name, 3858 strlen(sp->hisauth.name)); 3859 addlog("\n"); 3860 } 3861 if (debug) { 3862 log(LOG_DEBUG, SPP_FMT "chap input(%s) " 3863 "<%s id=0x%x len=%d name=", 3864 SPP_ARGS(ifp), 3865 sppp_state_name(sp->state[IDX_CHAP]), 3866 sppp_auth_type_name(PPP_CHAP, h->type), 3867 h->ident, ntohs (h->len)); 3868 sppp_print_string((char*)name, name_len); 3869 addlog(" value-size=%d value=", value_len); 3870 sppp_print_bytes(value, value_len); 3871 addlog(">\n"); 3872 } 3873 if (value_len != AUTHCHALEN) { 3874 if (debug) 3875 log(LOG_DEBUG, 3876 SPP_FMT "chap bad hash value length: " 3877 "%d bytes, should be %d\n", 3878 SPP_ARGS(ifp), value_len, 3879 AUTHCHALEN); 3880 break; 3881 } 3882 3883 MD5Init(&ctx); 3884 MD5Update(&ctx, &h->ident, 1); 3885 MD5Update(&ctx, sp->hisauth.secret, 3886 strlen(sp->hisauth.secret)); 3887 MD5Update(&ctx, sp->chap_challenge, AUTHCHALEN); 3888 MD5Final(digest, &ctx); 3889 3890 #define FAILMSG "Failed..." 3891 #define SUCCMSG "Welcome!" 3892 3893 if (value_len != sizeof digest || 3894 bcmp(digest, value, value_len) != 0) { 3895 /* action scn, tld */ 3896 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 3897 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 3898 0); 3899 chap.tld(sp); 3900 break; 3901 } 3902 /* action sca, perhaps tlu */ 3903 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 3904 sp->state[IDX_CHAP] == STATE_OPENED) 3905 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 3906 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 3907 0); 3908 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 3909 sppp_cp_change_state(&chap, sp, STATE_OPENED); 3910 chap.tlu(sp); 3911 } 3912 break; 3913 3914 default: 3915 /* Unknown CHAP packet type -- ignore. */ 3916 if (debug) { 3917 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) " 3918 "<0x%x id=0x%xh len=%d", 3919 SPP_ARGS(ifp), 3920 sppp_state_name(sp->state[IDX_CHAP]), 3921 h->type, h->ident, ntohs(h->len)); 3922 if (len > 4) 3923 sppp_print_bytes((u_char*)(h+1), len-4); 3924 addlog(">\n"); 3925 } 3926 break; 3927 3928 } 3929 } 3930 3931 HIDE void 3932 sppp_chap_init(struct sppp *sp) 3933 { 3934 /* Chap doesn't have STATE_INITIAL at all. */ 3935 sp->state[IDX_CHAP] = STATE_CLOSED; 3936 sp->fail_counter[IDX_CHAP] = 0; 3937 #if defined (__FreeBSD__) 3938 callout_handle_init(&sp->ch[IDX_CHAP]); 3939 #endif 3940 } 3941 3942 HIDE void 3943 sppp_chap_open(struct sppp *sp) 3944 { 3945 if (sp->myauth.proto == PPP_CHAP && 3946 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 3947 /* we are authenticator for CHAP, start it */ 3948 chap.scr(sp); 3949 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3950 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3951 } 3952 /* nothing to be done if we are peer, await a challenge */ 3953 } 3954 3955 HIDE void 3956 sppp_chap_close(struct sppp *sp) 3957 { 3958 if (sp->state[IDX_CHAP] != STATE_CLOSED) 3959 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3960 } 3961 3962 HIDE void 3963 sppp_chap_TO(void *cookie) 3964 { 3965 struct sppp *sp = (struct sppp *)cookie; 3966 STDDCL; 3967 int s; 3968 3969 s = splnet(); 3970 if (debug) 3971 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n", 3972 SPP_ARGS(ifp), 3973 sppp_state_name(sp->state[IDX_CHAP]), 3974 sp->rst_counter[IDX_CHAP]); 3975 3976 if (--sp->rst_counter[IDX_CHAP] < 0) 3977 /* TO- event */ 3978 switch (sp->state[IDX_CHAP]) { 3979 case STATE_REQ_SENT: 3980 chap.tld(sp); 3981 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3982 break; 3983 } 3984 else 3985 /* TO+ (or TO*) event */ 3986 switch (sp->state[IDX_CHAP]) { 3987 case STATE_OPENED: 3988 /* TO* event */ 3989 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3990 /* FALLTHROUGH */ 3991 case STATE_REQ_SENT: 3992 chap.scr(sp); 3993 /* sppp_cp_change_state() will restart the timer */ 3994 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3995 break; 3996 } 3997 3998 splx(s); 3999 } 4000 4001 HIDE void 4002 sppp_chap_tlu(struct sppp *sp) 4003 { 4004 STDDCL; 4005 int i = 0, x; 4006 4007 i = 0; 4008 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4009 4010 /* 4011 * Some broken CHAP implementations (Conware CoNet, firmware 4012 * 4.0.?) don't want to re-authenticate their CHAP once the 4013 * initial challenge-response exchange has taken place. 4014 * Provide for an option to avoid rechallenges. 4015 */ 4016 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) { 4017 /* 4018 * Compute the re-challenge timeout. This will yield 4019 * a number between 300 and 810 seconds. 4020 */ 4021 i = 300 + (arc4random() & 0x01fe); 4022 4023 #if defined (__FreeBSD__) 4024 sp->ch[IDX_CHAP] = timeout(chap.TO, (void *)sp, i * hz); 4025 #elif defined(__OpenBSD__) 4026 timeout_add(&sp->ch[IDX_CHAP], i * hz); 4027 #endif 4028 } 4029 4030 if (debug) { 4031 log(LOG_DEBUG, 4032 SPP_FMT "chap %s, ", 4033 SPP_ARGS(ifp), 4034 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu"); 4035 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) 4036 addlog("next re-challenge in %d seconds\n", i); 4037 else 4038 addlog("re-challenging suppressed\n"); 4039 } 4040 4041 x = splnet(); 4042 /* indicate to LCP that we need to be closed down */ 4043 sp->lcp.protos |= (1 << IDX_CHAP); 4044 4045 if (sp->pp_flags & PP_NEEDAUTH) { 4046 /* 4047 * Remote is authenticator, but his auth proto didn't 4048 * complete yet. Defer the transition to network 4049 * phase. 4050 */ 4051 splx(x); 4052 return; 4053 } 4054 splx(x); 4055 4056 /* 4057 * If we are already in phase network, we are done here. This 4058 * is the case if this is a dummy tlu event after a re-challenge. 4059 */ 4060 if (sp->pp_phase != PHASE_NETWORK) 4061 sppp_phase_network(sp); 4062 } 4063 4064 HIDE void 4065 sppp_chap_tld(struct sppp *sp) 4066 { 4067 STDDCL; 4068 4069 if (debug) 4070 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp)); 4071 UNTIMEOUT(chap.TO, (void *)sp, sp->ch[IDX_CHAP]); 4072 sp->lcp.protos &= ~(1 << IDX_CHAP); 4073 4074 lcp.Close(sp); 4075 } 4076 4077 HIDE void 4078 sppp_chap_scr(struct sppp *sp) 4079 { 4080 u_char clen; 4081 4082 /* Compute random challenge. */ 4083 arc4random_buf(sp->chap_challenge, sizeof(sp->chap_challenge)); 4084 clen = AUTHCHALEN; 4085 4086 sp->confid[IDX_CHAP] = ++sp->pp_seq; 4087 4088 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4089 sizeof clen, (const char *)&clen, 4090 (size_t)AUTHCHALEN, sp->chap_challenge, 4091 strlen(sp->myauth.name), 4092 sp->myauth.name, 4093 0); 4094 } 4095 /* 4096 *--------------------------------------------------------------------------* 4097 * * 4098 * The PAP implementation. * 4099 * * 4100 *--------------------------------------------------------------------------* 4101 */ 4102 /* 4103 * For PAP, we need to keep a little state also if we are the peer, not the 4104 * authenticator. This is since we don't get a request to authenticate, but 4105 * have to repeatedly authenticate ourself until we got a response (or the 4106 * retry counter is expired). 4107 */ 4108 4109 /* 4110 * Handle incoming PAP packets. */ 4111 HIDE void 4112 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4113 { 4114 STDDCL; 4115 struct lcp_header *h; 4116 int len, x; 4117 u_char *name, *passwd, mlen; 4118 int name_len, passwd_len; 4119 4120 len = m->m_pkthdr.len; 4121 if (len < 5) { 4122 if (debug) 4123 log(LOG_DEBUG, 4124 SPP_FMT "pap invalid packet length: %d bytes\n", 4125 SPP_ARGS(ifp), len); 4126 return; 4127 } 4128 h = mtod (m, struct lcp_header*); 4129 if (len > ntohs (h->len)) 4130 len = ntohs (h->len); 4131 switch (h->type) { 4132 /* PAP request is my authproto */ 4133 case PAP_REQ: 4134 name = 1 + (u_char*)(h+1); 4135 name_len = name[-1]; 4136 passwd = name + name_len + 1; 4137 if (name_len > len - 6 || 4138 (passwd_len = passwd[-1]) > len - 6 - name_len) { 4139 if (debug) { 4140 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4141 "<%s id=0x%x len=%d", 4142 SPP_ARGS(ifp), 4143 sppp_auth_type_name(PPP_PAP, h->type), 4144 h->ident, ntohs(h->len)); 4145 if (len > 4) 4146 sppp_print_bytes((u_char*)(h+1), len-4); 4147 addlog(">\n"); 4148 } 4149 break; 4150 } 4151 if (debug) { 4152 log(LOG_DEBUG, SPP_FMT "pap input(%s) " 4153 "<%s id=0x%x len=%d name=", 4154 SPP_ARGS(ifp), 4155 sppp_state_name(sp->state[IDX_PAP]), 4156 sppp_auth_type_name(PPP_PAP, h->type), 4157 h->ident, ntohs(h->len)); 4158 sppp_print_string((char*)name, name_len); 4159 addlog(" passwd="); 4160 sppp_print_string((char*)passwd, passwd_len); 4161 addlog(">\n"); 4162 } 4163 if (name_len > AUTHMAXLEN || 4164 passwd_len > AUTHMAXLEN || 4165 bcmp(name, sp->hisauth.name, name_len) != 0 || 4166 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) { 4167 /* action scn, tld */ 4168 mlen = sizeof(FAILMSG) - 1; 4169 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4170 sizeof mlen, (const char *)&mlen, 4171 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4172 0); 4173 pap.tld(sp); 4174 break; 4175 } 4176 /* action sca, perhaps tlu */ 4177 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4178 sp->state[IDX_PAP] == STATE_OPENED) { 4179 mlen = sizeof(SUCCMSG) - 1; 4180 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4181 sizeof mlen, (const char *)&mlen, 4182 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4183 0); 4184 } 4185 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4186 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4187 pap.tlu(sp); 4188 } 4189 break; 4190 4191 /* ack and nak are his authproto */ 4192 case PAP_ACK: 4193 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 4194 if (debug) { 4195 log(LOG_DEBUG, SPP_FMT "pap success", 4196 SPP_ARGS(ifp)); 4197 name_len = *((char *)h); 4198 if (len > 5 && name_len) { 4199 addlog(": "); 4200 sppp_print_string((char*)(h+1), name_len); 4201 } 4202 addlog("\n"); 4203 } 4204 x = splnet(); 4205 sp->pp_flags &= ~PP_NEEDAUTH; 4206 if (sp->myauth.proto == PPP_PAP && 4207 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4208 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4209 /* 4210 * We are authenticator for PAP but didn't 4211 * complete yet. Leave it to tlu to proceed 4212 * to network phase. 4213 */ 4214 splx(x); 4215 break; 4216 } 4217 splx(x); 4218 sppp_phase_network(sp); 4219 break; 4220 4221 case PAP_NAK: 4222 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 4223 if (debug) { 4224 log(LOG_INFO, SPP_FMT "pap failure", 4225 SPP_ARGS(ifp)); 4226 name_len = *((char *)h); 4227 if (len > 5 && name_len) { 4228 addlog(": "); 4229 sppp_print_string((char*)(h+1), name_len); 4230 } 4231 addlog("\n"); 4232 } else 4233 log(LOG_INFO, SPP_FMT "pap failure\n", 4234 SPP_ARGS(ifp)); 4235 /* await LCP shutdown by authenticator */ 4236 break; 4237 4238 default: 4239 /* Unknown PAP packet type -- ignore. */ 4240 if (debug) { 4241 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4242 "<0x%x id=0x%x len=%d", 4243 SPP_ARGS(ifp), 4244 h->type, h->ident, ntohs(h->len)); 4245 if (len > 4) 4246 sppp_print_bytes((u_char*)(h+1), len-4); 4247 addlog(">\n"); 4248 } 4249 break; 4250 4251 } 4252 } 4253 4254 HIDE void 4255 sppp_pap_init(struct sppp *sp) 4256 { 4257 /* PAP doesn't have STATE_INITIAL at all. */ 4258 sp->state[IDX_PAP] = STATE_CLOSED; 4259 sp->fail_counter[IDX_PAP] = 0; 4260 #if defined (__FreeBSD__) 4261 callout_handle_init(&sp->ch[IDX_PAP]); 4262 callout_handle_init(&sp->pap_my_to_ch); 4263 #endif 4264 } 4265 4266 HIDE void 4267 sppp_pap_open(struct sppp *sp) 4268 { 4269 if (sp->hisauth.proto == PPP_PAP && 4270 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4271 /* we are authenticator for PAP, start our timer */ 4272 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4273 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4274 } 4275 if (sp->myauth.proto == PPP_PAP) { 4276 /* we are peer, send a request, and start a timer */ 4277 pap.scr(sp); 4278 #if defined (__FreeBSD__) 4279 sp->pap_my_to_ch = 4280 timeout(sppp_pap_my_TO, (void *)sp, sp->lcp.timeout); 4281 #elif defined (__OpenBSD__) 4282 timeout_add(&sp->pap_my_to_ch, sp->lcp.timeout); 4283 #endif 4284 } 4285 } 4286 4287 HIDE void 4288 sppp_pap_close(struct sppp *sp) 4289 { 4290 if (sp->state[IDX_PAP] != STATE_CLOSED) 4291 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4292 } 4293 4294 /* 4295 * That's the timeout routine if we are authenticator. Since the 4296 * authenticator is basically passive in PAP, we can't do much here. 4297 */ 4298 HIDE void 4299 sppp_pap_TO(void *cookie) 4300 { 4301 struct sppp *sp = (struct sppp *)cookie; 4302 STDDCL; 4303 int s; 4304 4305 s = splnet(); 4306 if (debug) 4307 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n", 4308 SPP_ARGS(ifp), 4309 sppp_state_name(sp->state[IDX_PAP]), 4310 sp->rst_counter[IDX_PAP]); 4311 4312 if (--sp->rst_counter[IDX_PAP] < 0) 4313 /* TO- event */ 4314 switch (sp->state[IDX_PAP]) { 4315 case STATE_REQ_SENT: 4316 pap.tld(sp); 4317 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4318 break; 4319 } 4320 else 4321 /* TO+ event, not very much we could do */ 4322 switch (sp->state[IDX_PAP]) { 4323 case STATE_REQ_SENT: 4324 /* sppp_cp_change_state() will restart the timer */ 4325 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4326 break; 4327 } 4328 4329 splx(s); 4330 } 4331 4332 /* 4333 * That's the timeout handler if we are peer. Since the peer is active, 4334 * we need to retransmit our PAP request since it is apparently lost. 4335 * XXX We should impose a max counter. 4336 */ 4337 HIDE void 4338 sppp_pap_my_TO(void *cookie) 4339 { 4340 struct sppp *sp = (struct sppp *)cookie; 4341 STDDCL; 4342 4343 if (debug) 4344 log(LOG_DEBUG, SPP_FMT "pap peer TO\n", 4345 SPP_ARGS(ifp)); 4346 4347 pap.scr(sp); 4348 } 4349 4350 HIDE void 4351 sppp_pap_tlu(struct sppp *sp) 4352 { 4353 STDDCL; 4354 int x; 4355 4356 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4357 4358 if (debug) 4359 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 4360 SPP_ARGS(ifp), pap.name); 4361 4362 x = splnet(); 4363 /* indicate to LCP that we need to be closed down */ 4364 sp->lcp.protos |= (1 << IDX_PAP); 4365 4366 if (sp->pp_flags & PP_NEEDAUTH) { 4367 /* 4368 * Remote is authenticator, but his auth proto didn't 4369 * complete yet. Defer the transition to network 4370 * phase. 4371 */ 4372 splx(x); 4373 return; 4374 } 4375 splx(x); 4376 sppp_phase_network(sp); 4377 } 4378 4379 HIDE void 4380 sppp_pap_tld(struct sppp *sp) 4381 { 4382 STDDCL; 4383 4384 if (debug) 4385 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp)); 4386 UNTIMEOUT(pap.TO, (void *)sp, sp->ch[IDX_PAP]); 4387 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 4388 sp->lcp.protos &= ~(1 << IDX_PAP); 4389 4390 lcp.Close(sp); 4391 } 4392 4393 HIDE void 4394 sppp_pap_scr(struct sppp *sp) 4395 { 4396 u_char idlen, pwdlen; 4397 4398 sp->confid[IDX_PAP] = ++sp->pp_seq; 4399 pwdlen = strlen(sp->myauth.secret); 4400 idlen = strlen(sp->myauth.name); 4401 4402 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4403 sizeof idlen, (const char *)&idlen, 4404 (size_t)idlen, sp->myauth.name, 4405 sizeof pwdlen, (const char *)&pwdlen, 4406 (size_t)pwdlen, sp->myauth.secret, 4407 0); 4408 } 4409 /* 4410 * Random miscellaneous functions. 4411 */ 4412 4413 /* 4414 * Send a PAP or CHAP proto packet. 4415 * 4416 * Varadic function, each of the elements for the ellipsis is of type 4417 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4418 * mlen == 0. 4419 */ 4420 4421 HIDE void 4422 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4423 unsigned int type, u_int id, ...) 4424 { 4425 STDDCL; 4426 struct ppp_header *h; 4427 struct lcp_header *lh; 4428 struct mbuf *m; 4429 u_char *p; 4430 int len; 4431 size_t pkthdrlen; 4432 unsigned int mlen; 4433 const char *msg; 4434 va_list ap; 4435 4436 MGETHDR (m, M_DONTWAIT, MT_DATA); 4437 if (! m) 4438 return; 4439 m->m_pkthdr.rcvif = 0; 4440 4441 if (sp->pp_flags & PP_NOFRAMING) { 4442 *mtod(m, u_int16_t *) = htons(cp->proto); 4443 pkthdrlen = 2; 4444 lh = (struct lcp_header *)(mtod(m, u_int8_t *) + 2); 4445 } else { 4446 h = mtod (m, struct ppp_header*); 4447 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4448 h->control = PPP_UI; /* Unnumbered Info */ 4449 h->protocol = htons(cp->proto); 4450 pkthdrlen = PPP_HEADER_LEN; 4451 lh = (struct lcp_header*)(h + 1); 4452 } 4453 4454 lh->type = type; 4455 lh->ident = id; 4456 p = (u_char*) (lh+1); 4457 4458 va_start(ap, id); 4459 len = 0; 4460 4461 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4462 msg = va_arg(ap, const char *); 4463 len += mlen; 4464 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4465 va_end(ap); 4466 m_freem(m); 4467 return; 4468 } 4469 4470 bcopy(msg, p, mlen); 4471 p += mlen; 4472 } 4473 va_end(ap); 4474 4475 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4476 lh->len = htons (LCP_HEADER_LEN + len); 4477 4478 if (debug) { 4479 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 4480 SPP_ARGS(ifp), cp->name, 4481 sppp_auth_type_name(cp->proto, lh->type), 4482 lh->ident, ntohs(lh->len)); 4483 if (len) 4484 sppp_print_bytes((u_char*) (lh+1), len); 4485 addlog(">\n"); 4486 } 4487 if (IF_QFULL (&sp->pp_cpq)) { 4488 IF_DROP (&sp->pp_fastq); 4489 IF_DROP (&ifp->if_snd); 4490 m_freem (m); 4491 ++ifp->if_oerrors; 4492 m = NULL; 4493 } else 4494 IF_ENQUEUE (&sp->pp_cpq, m); 4495 if (! (ifp->if_flags & IFF_OACTIVE)) 4496 (*ifp->if_start) (ifp); 4497 if (m != NULL) 4498 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 4499 } 4500 4501 /* 4502 * Flush interface queue. 4503 */ 4504 HIDE void 4505 sppp_qflush(struct ifqueue *ifq) 4506 { 4507 struct mbuf *m, *n; 4508 4509 n = ifq->ifq_head; 4510 while ((m = n)) { 4511 n = m->m_act; 4512 m_freem (m); 4513 } 4514 ifq->ifq_head = 0; 4515 ifq->ifq_tail = 0; 4516 ifq->ifq_len = 0; 4517 } 4518 4519 /* 4520 * Send keepalive packets, every 10 seconds. 4521 */ 4522 HIDE void 4523 sppp_keepalive(void *dummy) 4524 { 4525 struct sppp *sp; 4526 int s; 4527 struct timeval tv; 4528 4529 s = splnet(); 4530 getmicrouptime(&tv); 4531 for (sp=spppq; sp; sp=sp->pp_next) { 4532 struct ifnet *ifp = &sp->pp_if; 4533 4534 /* Keepalive mode disabled or channel down? */ 4535 if (! (sp->pp_flags & PP_KEEPALIVE) || 4536 ! (ifp->if_flags & IFF_RUNNING)) 4537 continue; 4538 4539 /* No keepalive in PPP mode if LCP not opened yet. */ 4540 if (! (sp->pp_flags & PP_CISCO) && 4541 sp->pp_phase < PHASE_AUTHENTICATE) 4542 continue; 4543 4544 /* No echo reply, but maybe user data passed through? */ 4545 if (!(sp->pp_flags & PP_CISCO) && 4546 (tv.tv_sec - sp->pp_last_receive) < NORECV_TIME) { 4547 sp->pp_alivecnt = 0; 4548 continue; 4549 } 4550 4551 if (sp->pp_alivecnt >= MAXALIVECNT) { 4552 /* No keepalive packets got. Stop the interface. */ 4553 if_down (ifp); 4554 sppp_qflush (&sp->pp_cpq); 4555 if (! (sp->pp_flags & PP_CISCO)) { 4556 log(LOG_INFO, SPP_FMT "LCP keepalive timeout\n", 4557 SPP_ARGS(ifp)); 4558 sp->pp_alivecnt = 0; 4559 4560 /* we are down, close all open protocols */ 4561 lcp.Close(sp); 4562 4563 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4564 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4565 4566 /* Close connection immediately, completition of this 4567 * will summon the magic needed to reestablish it. */ 4568 if (sp->pp_tlf) 4569 sp->pp_tlf(sp); 4570 continue; 4571 } 4572 } 4573 if (sp->pp_alivecnt < MAXALIVECNT) 4574 ++sp->pp_alivecnt; 4575 if (sp->pp_flags & PP_CISCO) 4576 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, ++sp->pp_seq, 4577 sp->pp_rseq); 4578 else if (sp->pp_phase >= PHASE_AUTHENTICATE) { 4579 unsigned long nmagic = htonl (sp->lcp.magic); 4580 sp->lcp.echoid = ++sp->pp_seq; 4581 sppp_cp_send (sp, PPP_LCP, ECHO_REQ, 4582 sp->lcp.echoid, 4, &nmagic); 4583 } 4584 } 4585 splx(s); 4586 #if defined (__FreeBSD__) 4587 keepalive_ch = timeout(sppp_keepalive, 0, hz * 10); 4588 #endif 4589 #if defined (__OpenBSD__) 4590 timeout_add(&keepalive_ch, hz * 10); 4591 #endif 4592 } 4593 4594 /* 4595 * Get both IP addresses. 4596 */ 4597 HIDE void 4598 sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, 4599 u_int32_t *srcmask) 4600 { 4601 struct ifnet *ifp = &sp->pp_if; 4602 struct ifaddr *ifa; 4603 struct sockaddr_in *si, *sm = 0; 4604 u_int32_t ssrc, ddst; 4605 4606 sm = NULL; 4607 ssrc = ddst = 0; 4608 /* 4609 * Pick the first AF_INET address from the list, 4610 * aliases don't make any sense on a p2p link anyway. 4611 */ 4612 #if defined (__FreeBSD__) 4613 for (ifa = ifp->if_addrhead.tqh_first, si = 0; 4614 ifa; 4615 ifa = ifa->ifa_link.tqe_next) 4616 #else 4617 si = 0; 4618 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4619 #endif 4620 { 4621 if (ifa->ifa_addr->sa_family == AF_INET) { 4622 si = (struct sockaddr_in *)ifa->ifa_addr; 4623 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4624 if (si) 4625 break; 4626 } 4627 } 4628 if (ifa) { 4629 if (si && si->sin_addr.s_addr) { 4630 ssrc = si->sin_addr.s_addr; 4631 if (srcmask) 4632 *srcmask = ntohl(sm->sin_addr.s_addr); 4633 } 4634 4635 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4636 if (si && si->sin_addr.s_addr) 4637 ddst = si->sin_addr.s_addr; 4638 } 4639 4640 if (dst) *dst = ntohl(ddst); 4641 if (src) *src = ntohl(ssrc); 4642 } 4643 4644 /* 4645 * If an address is 0, leave it the way it is. 4646 */ 4647 HIDE void 4648 sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr) 4649 { 4650 STDDCL; 4651 struct ifaddr *ifa; 4652 struct sockaddr_in *si; 4653 struct sockaddr_in *dest; 4654 4655 /* 4656 * Pick the first AF_INET address from the list, 4657 * aliases don't make any sense on a p2p link anyway. 4658 */ 4659 4660 #if defined (__FreeBSD__) 4661 for (ifa = ifp->if_addrhead.tqh_first, si = 0; 4662 ifa; 4663 ifa = ifa->ifa_link.tqe_next) 4664 #else 4665 si = 0; 4666 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4667 #endif 4668 { 4669 if (ifa->ifa_addr->sa_family == AF_INET) 4670 { 4671 si = (struct sockaddr_in *)ifa->ifa_addr; 4672 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4673 if (si) 4674 break; 4675 } 4676 } 4677 4678 if (ifa && si) { 4679 int error; 4680 struct sockaddr_in new_sin = *si; 4681 struct sockaddr_in new_dst = *dest; 4682 4683 /* 4684 * Scrub old routes now instead of calling in_ifinit with 4685 * scrub=1, because we may change the dstaddr 4686 * before the call to in_ifinit. 4687 */ 4688 in_ifscrub(ifp, ifatoia(ifa)); 4689 4690 if (myaddr != 0) 4691 new_sin.sin_addr.s_addr = htonl(myaddr); 4692 if (hisaddr != 0) { 4693 new_dst.sin_addr.s_addr = htonl(hisaddr); 4694 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4695 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4696 *dest = new_dst; /* fix dstaddr in place */ 4697 } 4698 } 4699 if (!(error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0))) 4700 dohooks(ifp->if_addrhooks, 0); 4701 if (debug && error) { 4702 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addrs: in_ifinit " 4703 " failed, error=%d\n", SPP_ARGS(ifp), error); 4704 } 4705 } 4706 } 4707 4708 /* 4709 * Clear IP addresses. Must be called at splnet. 4710 */ 4711 HIDE void 4712 sppp_clear_ip_addrs(struct sppp *sp) 4713 { 4714 struct ifnet *ifp = &sp->pp_if; 4715 struct ifaddr *ifa; 4716 struct sockaddr_in *si; 4717 struct sockaddr_in *dest; 4718 4719 u_int32_t remote; 4720 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4721 remote = sp->ipcp.saved_hisaddr; 4722 else 4723 sppp_get_ip_addrs(sp, 0, &remote, 0); 4724 4725 /* 4726 * Pick the first AF_INET address from the list, 4727 * aliases don't make any sense on a p2p link anyway. 4728 */ 4729 4730 si = 0; 4731 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 4732 if (ifa->ifa_addr->sa_family == AF_INET) { 4733 si = (struct sockaddr_in *)ifa->ifa_addr; 4734 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4735 if (si) 4736 break; 4737 } 4738 } 4739 4740 if (ifa && si) { 4741 struct sockaddr_in new_sin = *si; 4742 4743 in_ifscrub(ifp, ifatoia(ifa)); 4744 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4745 new_sin.sin_addr.s_addr = 0; 4746 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4747 /* replace peer addr in place */ 4748 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4749 if (!in_ifinit(ifp, ifatoia(ifa), &new_sin, 0)) 4750 dohooks(ifp->if_addrhooks, 0); 4751 } 4752 } 4753 4754 4755 #ifdef INET6 4756 /* 4757 * Get both IPv6 addresses. 4758 */ 4759 HIDE void 4760 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4761 struct in6_addr *srcmask) 4762 { 4763 struct ifnet *ifp = &sp->pp_if; 4764 struct ifaddr *ifa; 4765 struct sockaddr_in6 *si, *sm; 4766 struct in6_addr ssrc, ddst; 4767 4768 sm = NULL; 4769 bzero(&ssrc, sizeof(ssrc)); 4770 bzero(&ddst, sizeof(ddst)); 4771 /* 4772 * Pick the first link-local AF_INET6 address from the list, 4773 * aliases don't make any sense on a p2p link anyway. 4774 */ 4775 si = 0; 4776 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 4777 if (ifa->ifa_addr->sa_family == AF_INET6) { 4778 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4779 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4780 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4781 break; 4782 } 4783 } 4784 4785 if (ifa) { 4786 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4787 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 4788 if (srcmask) { 4789 bcopy(&sm->sin6_addr, srcmask, 4790 sizeof(*srcmask)); 4791 } 4792 } 4793 4794 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4795 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4796 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 4797 } 4798 4799 if (dst) 4800 bcopy(&ddst, dst, sizeof(*dst)); 4801 if (src) 4802 bcopy(&ssrc, src, sizeof(*src)); 4803 } 4804 4805 #ifdef IPV6CP_MYIFID_DYN 4806 /* 4807 * Generate random ifid. 4808 */ 4809 HIDE void 4810 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 4811 { 4812 /* TBD */ 4813 } 4814 4815 /* 4816 * Set my IPv6 address. Must be called at splimp. 4817 */ 4818 HIDE void 4819 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 4820 { 4821 struct ifnet *ifp = &sp->pp_if; 4822 struct ifaddr *ifa; 4823 struct sockaddr_in6 *sin6; 4824 4825 /* 4826 * Pick the first link-local AF_INET6 address from the list, 4827 * aliases don't make any sense on a p2p link anyway. 4828 */ 4829 4830 sin6 = NULL; 4831 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 4832 if (ifa->ifa_addr->sa_family == AF_INET6) { 4833 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 4834 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 4835 break; 4836 } 4837 } 4838 4839 if (ifa && sin6) { 4840 struct sockaddr_in6 new_sin6 = *sin6; 4841 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 4842 dohooks(ifp->if_addrhooks, 0); 4843 } 4844 } 4845 #endif 4846 4847 /* 4848 * Suggest a candidate address to be used by peer. 4849 */ 4850 HIDE void 4851 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 4852 { 4853 struct in6_addr myaddr; 4854 struct timeval tv; 4855 4856 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 4857 4858 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 4859 getmicrouptime(&tv); 4860 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 4861 myaddr.s6_addr[14] ^= 0xff; 4862 myaddr.s6_addr[15] ^= 0xff; 4863 } else { 4864 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 4865 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 4866 } 4867 if (suggest) 4868 bcopy(&myaddr, suggest, sizeof(myaddr)); 4869 } 4870 #endif /*INET6*/ 4871 4872 HIDE int 4873 sppp_get_params(struct sppp *sp, struct ifreq *ifr) 4874 { 4875 int cmd; 4876 4877 if (copyin((caddr_t)ifr->ifr_data, &cmd, sizeof cmd) != 0) 4878 return EFAULT; 4879 4880 switch (cmd) { 4881 case SPPPIOGDEFS: 4882 { 4883 struct spppreq *spr; 4884 4885 spr = malloc(sizeof(*spr), M_DEVBUF, M_WAITOK); 4886 4887 /* 4888 * We copy over the entire current state, but clean 4889 * out some of the stuff we don't wanna pass up. 4890 * Remember, SIOCGIFGENERIC is unprotected, and can be 4891 * called by any user. No need to ever get PAP or 4892 * CHAP secrets back to userland anyway. 4893 */ 4894 4895 spr->cmd = cmd; 4896 bcopy(sp, &spr->defs, sizeof(struct sppp)); 4897 4898 bzero(&spr->defs.myauth, sizeof(spr->defs.myauth)); 4899 bzero(&spr->defs.hisauth, sizeof(spr->defs.hisauth)); 4900 bzero(&spr->defs.chap_challenge, sizeof(spr->defs.chap_challenge)); 4901 4902 if (copyout(spr, (caddr_t)ifr->ifr_data, sizeof(*spr)) != 0) { 4903 free(spr, M_DEVBUF); 4904 return EFAULT; 4905 } 4906 free(spr, M_DEVBUF); 4907 break; 4908 } 4909 case SPPPIOGMAUTH: 4910 case SPPPIOGHAUTH: 4911 { 4912 struct sauthreq *spa; 4913 struct sauth *auth; 4914 4915 spa = malloc(sizeof(*spa), M_DEVBUF, M_WAITOK); 4916 auth = (cmd == SPPPIOGMAUTH) ? &sp->myauth : &sp->hisauth; 4917 bzero(spa, sizeof(*spa)); 4918 spa->proto = auth->proto; 4919 spa->flags = auth->flags; 4920 4921 /* do not copy the secret, and only let root know the name */ 4922 if (auth->name != NULL && suser(curproc, 0) == 0) 4923 strlcpy(spa->name, auth->name, sizeof(spa->name)); 4924 4925 if (copyout(spa, (caddr_t)ifr->ifr_data, sizeof(*spa)) != 0) { 4926 free(spa, M_DEVBUF); 4927 return EFAULT; 4928 } 4929 free(spa, M_DEVBUF); 4930 break; 4931 } 4932 default: 4933 return EINVAL; 4934 } 4935 4936 return 0; 4937 } 4938 4939 4940 HIDE int 4941 sppp_set_params(struct sppp *sp, struct ifreq *ifr) 4942 { 4943 int cmd; 4944 4945 if (copyin((caddr_t)ifr->ifr_data, &cmd, sizeof cmd) != 0) 4946 return EFAULT; 4947 4948 /* 4949 * We have a very specific idea of which fields we allow 4950 * being passed back from userland, so to not clobber our 4951 * current state. For one, we only allow setting 4952 * anything if LCP is in dead phase. Once the LCP 4953 * negotiations started, the authentication settings must 4954 * not be changed again. (The administrator can force an 4955 * ifconfig down in order to get LCP back into dead 4956 * phase.) 4957 */ 4958 if (sp->pp_phase != PHASE_DEAD) 4959 return EBUSY; 4960 4961 switch (cmd) { 4962 case SPPPIOSDEFS: 4963 { 4964 struct spppreq *spr; 4965 4966 spr = malloc(sizeof(*spr), M_DEVBUF, M_WAITOK); 4967 4968 if (copyin((caddr_t)ifr->ifr_data, spr, sizeof(*spr)) != 0) { 4969 free(spr, M_DEVBUF); 4970 return EFAULT; 4971 } 4972 /* 4973 * Also, we only allow for authentication parameters to be 4974 * specified. 4975 * 4976 * XXX Should allow to set or clear pp_flags. 4977 */ 4978 free(spr, M_DEVBUF); 4979 break; 4980 } 4981 case SPPPIOSMAUTH: 4982 case SPPPIOSHAUTH: 4983 { 4984 /* 4985 * Finally, if the respective authentication protocol to 4986 * be used is set differently than 0, but the secret is 4987 * passed as all zeros, we don't trash the existing secret. 4988 * This allows an administrator to change the system name 4989 * only without clobbering the secret (which he didn't get 4990 * back in a previous SPPPIOGXAUTH call). However, the 4991 * secrets are cleared if the authentication protocol is 4992 * reset to 0. 4993 */ 4994 4995 struct sauthreq *spa; 4996 struct sauth *auth; 4997 char *p; 4998 int len; 4999 5000 spa = malloc(sizeof(*spa), M_DEVBUF, M_WAITOK); 5001 5002 auth = (cmd == SPPPIOSMAUTH) ? &sp->myauth : &sp->hisauth; 5003 5004 if (copyin((caddr_t)ifr->ifr_data, spa, sizeof(*spa)) != 0) { 5005 free(spa, M_DEVBUF); 5006 return EFAULT; 5007 } 5008 5009 if (spa->proto != 0 && spa->proto != PPP_PAP && 5010 spa->proto != PPP_CHAP) { 5011 free(spa, M_DEVBUF); 5012 return EINVAL; 5013 } 5014 5015 if (spa->proto == 0) { 5016 /* resetting auth */ 5017 if (auth->name != NULL) 5018 free(auth->name, M_DEVBUF); 5019 if (auth->secret != NULL) 5020 free(auth->secret, M_DEVBUF); 5021 bzero(auth, sizeof *auth); 5022 bzero(sp->chap_challenge, sizeof sp->chap_challenge); 5023 } else { 5024 /* setting/changing auth */ 5025 auth->proto = spa->proto; 5026 auth->flags = spa->flags; 5027 5028 spa->name[AUTHMAXLEN - 1] = '\0'; 5029 len = strlen(spa->name) + 1; 5030 p = malloc(len, M_DEVBUF, M_WAITOK); 5031 strlcpy(p, spa->name, len); 5032 if (auth->name != NULL) 5033 free(auth->name, M_DEVBUF); 5034 auth->name = p; 5035 5036 if (spa->secret[0] != '\0') { 5037 spa->secret[AUTHMAXLEN - 1] = '\0'; 5038 len = strlen(spa->secret) + 1; 5039 p = malloc(len, M_DEVBUF, M_WAITOK); 5040 strlcpy(p, spa->secret, len); 5041 if (auth->secret != NULL) 5042 free(auth->secret, M_DEVBUF); 5043 auth->secret = p; 5044 } 5045 } 5046 free(spa, M_DEVBUF); 5047 break; 5048 } 5049 default: 5050 return EINVAL; 5051 } 5052 5053 return 0; 5054 } 5055 5056 HIDE void 5057 sppp_phase_network(struct sppp *sp) 5058 { 5059 int i; 5060 u_long mask; 5061 5062 sp->pp_phase = PHASE_NETWORK; 5063 5064 sppp_set_phase(sp); 5065 5066 /* Notify NCPs now. */ 5067 for (i = 0; i < IDX_COUNT; i++) 5068 if ((cps[i])->flags & CP_NCP) 5069 (cps[i])->Open(sp); 5070 5071 /* Send Up events to all NCPs. */ 5072 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5073 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_NCP)) 5074 (cps[i])->Up(sp); 5075 5076 /* if no NCP is starting, all this was in vain, close down */ 5077 sppp_lcp_check_and_close(sp); 5078 } 5079 5080 5081 HIDE const char * 5082 sppp_cp_type_name(u_char type) 5083 { 5084 static char buf[12]; 5085 switch (type) { 5086 case CONF_REQ: return "conf-req"; 5087 case CONF_ACK: return "conf-ack"; 5088 case CONF_NAK: return "conf-nak"; 5089 case CONF_REJ: return "conf-rej"; 5090 case TERM_REQ: return "term-req"; 5091 case TERM_ACK: return "term-ack"; 5092 case CODE_REJ: return "code-rej"; 5093 case PROTO_REJ: return "proto-rej"; 5094 case ECHO_REQ: return "echo-req"; 5095 case ECHO_REPLY: return "echo-reply"; 5096 case DISC_REQ: return "discard-req"; 5097 } 5098 snprintf (buf, sizeof buf, "0x%x", type); 5099 return buf; 5100 } 5101 5102 HIDE const char * 5103 sppp_auth_type_name(u_short proto, u_char type) 5104 { 5105 static char buf[12]; 5106 switch (proto) { 5107 case PPP_CHAP: 5108 switch (type) { 5109 case CHAP_CHALLENGE: return "challenge"; 5110 case CHAP_RESPONSE: return "response"; 5111 case CHAP_SUCCESS: return "success"; 5112 case CHAP_FAILURE: return "failure"; 5113 } 5114 case PPP_PAP: 5115 switch (type) { 5116 case PAP_REQ: return "req"; 5117 case PAP_ACK: return "ack"; 5118 case PAP_NAK: return "nak"; 5119 } 5120 } 5121 snprintf (buf, sizeof buf, "0x%x", type); 5122 return buf; 5123 } 5124 5125 HIDE const char * 5126 sppp_lcp_opt_name(u_char opt) 5127 { 5128 static char buf[12]; 5129 switch (opt) { 5130 case LCP_OPT_MRU: return "mru"; 5131 case LCP_OPT_ASYNC_MAP: return "async-map"; 5132 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5133 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5134 case LCP_OPT_MAGIC: return "magic"; 5135 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5136 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5137 } 5138 snprintf (buf, sizeof buf, "0x%x", opt); 5139 return buf; 5140 } 5141 5142 HIDE const char * 5143 sppp_ipcp_opt_name(u_char opt) 5144 { 5145 static char buf[12]; 5146 switch (opt) { 5147 case IPCP_OPT_ADDRESSES: return "addresses"; 5148 case IPCP_OPT_COMPRESSION: return "compression"; 5149 case IPCP_OPT_ADDRESS: return "address"; 5150 } 5151 snprintf (buf, sizeof buf, "0x%x", opt); 5152 return buf; 5153 } 5154 5155 #ifdef INET6 5156 HIDE const char * 5157 sppp_ipv6cp_opt_name(u_char opt) 5158 { 5159 static char buf[12]; 5160 switch (opt) { 5161 case IPV6CP_OPT_IFID: return "ifid"; 5162 case IPV6CP_OPT_COMPRESSION: return "compression"; 5163 } 5164 snprintf (buf, sizeof buf, "0x%x", opt); 5165 return buf; 5166 } 5167 #endif 5168 5169 HIDE const char * 5170 sppp_state_name(int state) 5171 { 5172 switch (state) { 5173 case STATE_INITIAL: return "initial"; 5174 case STATE_STARTING: return "starting"; 5175 case STATE_CLOSED: return "closed"; 5176 case STATE_STOPPED: return "stopped"; 5177 case STATE_CLOSING: return "closing"; 5178 case STATE_STOPPING: return "stopping"; 5179 case STATE_REQ_SENT: return "req-sent"; 5180 case STATE_ACK_RCVD: return "ack-rcvd"; 5181 case STATE_ACK_SENT: return "ack-sent"; 5182 case STATE_OPENED: return "opened"; 5183 } 5184 return "illegal"; 5185 } 5186 5187 HIDE const char * 5188 sppp_phase_name(enum ppp_phase phase) 5189 { 5190 switch (phase) { 5191 case PHASE_DEAD: return "dead"; 5192 case PHASE_ESTABLISH: return "establish"; 5193 case PHASE_TERMINATE: return "terminate"; 5194 case PHASE_AUTHENTICATE: return "authenticate"; 5195 case PHASE_NETWORK: return "network"; 5196 } 5197 return "illegal"; 5198 } 5199 5200 HIDE const char * 5201 sppp_proto_name(u_short proto) 5202 { 5203 static char buf[12]; 5204 switch (proto) { 5205 case PPP_LCP: return "lcp"; 5206 case PPP_IPCP: return "ipcp"; 5207 case PPP_PAP: return "pap"; 5208 case PPP_CHAP: return "chap"; 5209 } 5210 snprintf(buf, sizeof buf, "0x%x", (unsigned)proto); 5211 return buf; 5212 } 5213 5214 HIDE void 5215 sppp_print_bytes(const u_char *p, u_short len) 5216 { 5217 addlog(" %02x", *p++); 5218 while (--len > 0) 5219 addlog("-%02x", *p++); 5220 } 5221 5222 HIDE void 5223 sppp_print_string(const char *p, u_short len) 5224 { 5225 u_char c; 5226 5227 while (len-- > 0) { 5228 c = *p++; 5229 /* 5230 * Print only ASCII chars directly. RFC 1994 recommends 5231 * using only them, but we don't rely on it. */ 5232 if (c < ' ' || c > '~') 5233 addlog("\\x%x", c); 5234 else 5235 addlog("%c", c); 5236 } 5237 } 5238 5239 HIDE const char * 5240 sppp_dotted_quad(u_int32_t addr) 5241 { 5242 static char s[16]; 5243 snprintf(s, sizeof s, "%d.%d.%d.%d", 5244 (int)((addr >> 24) & 0xff), 5245 (int)((addr >> 16) & 0xff), 5246 (int)((addr >> 8) & 0xff), 5247 (int)(addr & 0xff)); 5248 return s; 5249 } 5250 5251 /* a dummy, used to drop uninteresting events */ 5252 HIDE void 5253 sppp_null(struct sppp *unused) 5254 { 5255 /* do just nothing */ 5256 } 5257 /* 5258 * This file is large. Tell emacs to highlight it nevertheless. 5259 * 5260 * Local Variables: 5261 * hilit-auto-highlight-maxout: 120000 5262 * End: 5263 */ 5264 5265 HIDE void 5266 sppp_set_phase(struct sppp *sp) 5267 { 5268 STDDCL; 5269 int lstate, s; 5270 5271 if (debug) 5272 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 5273 sppp_phase_name(sp->pp_phase)); 5274 5275 /* set link state */ 5276 if (sp->pp_phase == PHASE_NETWORK) 5277 lstate = LINK_STATE_UP; 5278 else 5279 lstate = LINK_STATE_DOWN; 5280 5281 if (ifp->if_link_state != lstate) { 5282 ifp->if_link_state = lstate; 5283 s = splsoftnet(); 5284 if_link_state_change(ifp); 5285 splx(s); 5286 } 5287 } 5288