if_spppsubr.c revision 1.30
1 /* $NetBSD: if_spppsubr.c,v 1.30 2001/12/04 21:32:15 ross Exp $ */ 2 3 /* 4 * Synchronous PPP/Cisco link level subroutines. 5 * Keepalive protocol implemented in both Cisco and PPP modes. 6 * 7 * Copyright (C) 1994-1996 Cronyx Engineering Ltd. 8 * Author: Serge Vakulenko, <vak (at) cronyx.ru> 9 * 10 * Heavily revamped to conform to RFC 1661. 11 * Copyright (C) 1997, Joerg Wunsch. 12 * 13 * RFC2472 IPv6CP support. 14 * Copyright (C) 2000, Jun-ichiro itojun Hagino <itojun (at) iijlab.net>. 15 * 16 * This software is distributed with NO WARRANTIES, not even the implied 17 * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 18 * 19 * Authors grant any other persons or organisations permission to use 20 * or modify this software as long as this message is kept with the software, 21 * all derivative works or modified versions. 22 * 23 * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997 24 * 25 * From: if_spppsubr.c,v 1.39 1998/04/04 13:26:03 phk Exp 26 * 27 * From: Id: if_spppsubr.c,v 1.23 1999/02/23 14:47:50 hm Exp 28 */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: if_spppsubr.c,v 1.30 2001/12/04 21:32:15 ross Exp $"); 32 33 #include "opt_inet.h" 34 #include "opt_ipx.h" 35 #include "opt_iso.h" 36 #include "opt_ns.h" 37 38 #include <sys/param.h> 39 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/sockio.h> 43 #include <sys/socket.h> 44 #include <sys/syslog.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 48 #include <sys/md5.h> 49 50 #include <net/if.h> 51 #include <net/netisr.h> 52 #include <net/if_types.h> 53 #include <net/route.h> 54 #include <net/ppp_defs.h> 55 56 #include <machine/stdarg.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_systm.h> 60 #include <netinet/in_var.h> 61 #ifdef INET 62 #include <netinet/ip.h> 63 #include <netinet/tcp.h> 64 #endif 65 #include <net/ethertypes.h> 66 67 #ifdef IPX 68 #include <netipx/ipx.h> 69 #include <netipx/ipx_if.h> 70 #endif 71 72 #ifdef NS 73 #include <netns/ns.h> 74 #include <netns/ns_if.h> 75 #endif 76 77 #ifdef ISO 78 #include <netiso/argo_debug.h> 79 #include <netiso/iso.h> 80 #include <netiso/iso_var.h> 81 #include <netiso/iso_snpac.h> 82 #endif 83 84 #include <net/if_sppp.h> 85 86 #define MAXALIVECNT 3 /* max. alive packets */ 87 88 /* 89 * Interface flags that can be set in an ifconfig command. 90 * 91 * Setting link0 will make the link passive, i.e. it will be marked 92 * as being administrative openable, but won't be opened to begin 93 * with. Incoming calls will be answered, or subsequent calls with 94 * -link1 will cause the administrative open of the LCP layer. 95 * 96 * Setting link1 will cause the link to auto-dial only as packets 97 * arrive to be sent. 98 * 99 * Setting IFF_DEBUG will syslog the option negotiation and state 100 * transitions at level kern.debug. Note: all logs consistently look 101 * like 102 * 103 * <if-name><unit>: <proto-name> <additional info...> 104 * 105 * with <if-name><unit> being something like "bppp0", and <proto-name> 106 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 107 */ 108 109 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 110 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 111 112 #define CONF_REQ 1 /* PPP configure request */ 113 #define CONF_ACK 2 /* PPP configure acknowledge */ 114 #define CONF_NAK 3 /* PPP configure negative ack */ 115 #define CONF_REJ 4 /* PPP configure reject */ 116 #define TERM_REQ 5 /* PPP terminate request */ 117 #define TERM_ACK 6 /* PPP terminate acknowledge */ 118 #define CODE_REJ 7 /* PPP code reject */ 119 #define PROTO_REJ 8 /* PPP protocol reject */ 120 #define ECHO_REQ 9 /* PPP echo request */ 121 #define ECHO_REPLY 10 /* PPP echo reply */ 122 #define DISC_REQ 11 /* PPP discard request */ 123 124 #define LCP_OPT_MRU 1 /* maximum receive unit */ 125 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 126 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 127 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 128 #define LCP_OPT_MAGIC 5 /* magic number */ 129 #define LCP_OPT_RESERVED 6 /* reserved */ 130 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 131 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 132 133 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 134 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 135 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 136 137 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 138 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 139 140 #define PAP_REQ 1 /* PAP name/password request */ 141 #define PAP_ACK 2 /* PAP acknowledge */ 142 #define PAP_NAK 3 /* PAP fail */ 143 144 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 145 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 146 #define CHAP_SUCCESS 3 /* CHAP response ok */ 147 #define CHAP_FAILURE 4 /* CHAP response failed */ 148 149 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 150 151 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 152 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 153 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 154 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 155 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 156 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 157 158 /* states are named and numbered according to RFC 1661 */ 159 #define STATE_INITIAL 0 160 #define STATE_STARTING 1 161 #define STATE_CLOSED 2 162 #define STATE_STOPPED 3 163 #define STATE_CLOSING 4 164 #define STATE_STOPPING 5 165 #define STATE_REQ_SENT 6 166 #define STATE_ACK_RCVD 7 167 #define STATE_ACK_SENT 8 168 #define STATE_OPENED 9 169 170 struct ppp_header { 171 u_char address; 172 u_char control; 173 u_short protocol; 174 } __attribute__((__packed__)); 175 #define PPP_HEADER_LEN sizeof (struct ppp_header) 176 177 struct lcp_header { 178 u_char type; 179 u_char ident; 180 u_short len; 181 } __attribute__((__packed__)); 182 #define LCP_HEADER_LEN sizeof (struct lcp_header) 183 184 struct cisco_packet { 185 u_int32_t type; 186 u_int32_t par1; 187 u_int32_t par2; 188 u_short rel; 189 u_short time0; 190 u_short time1; 191 } __attribute__((__packed__)); 192 #define CISCO_PACKET_LEN 18 193 194 /* 195 * We follow the spelling and capitalization of RFC 1661 here, to make 196 * it easier comparing with the standard. Please refer to this RFC in 197 * case you can't make sense out of these abbreviation; it will also 198 * explain the semantics related to the various events and actions. 199 */ 200 struct cp { 201 u_short proto; /* PPP control protocol number */ 202 u_char protoidx; /* index into state table in struct sppp */ 203 u_char flags; 204 #define CP_LCP 0x01 /* this is the LCP */ 205 #define CP_AUTH 0x02 /* this is an authentication protocol */ 206 #define CP_NCP 0x04 /* this is a NCP */ 207 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 208 const char *name; /* name of this control protocol */ 209 /* event handlers */ 210 void (*Up)(struct sppp *sp); 211 void (*Down)(struct sppp *sp); 212 void (*Open)(struct sppp *sp); 213 void (*Close)(struct sppp *sp); 214 void (*TO)(void *sp); 215 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 216 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 217 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 218 /* actions */ 219 void (*tlu)(struct sppp *sp); 220 void (*tld)(struct sppp *sp); 221 void (*tls)(struct sppp *sp); 222 void (*tlf)(struct sppp *sp); 223 void (*scr)(struct sppp *sp); 224 }; 225 226 static struct sppp *spppq; 227 static struct callout keepalive_ch; 228 229 #ifdef __FreeBSD__ 230 #define SPP_FMT "%s%d: " 231 #define SPP_ARGS(ifp) (ifp)->if_name, (ifp)->if_unit 232 #else 233 #define SPP_FMT "%s: " 234 #define SPP_ARGS(ifp) (ifp)->if_xname 235 #endif 236 237 #ifdef INET 238 /* 239 * The following disgusting hack gets around the problem that IP TOS 240 * can't be set yet. We want to put "interactive" traffic on a high 241 * priority queue. To decide if traffic is interactive, we check that 242 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 243 * 244 * XXX is this really still necessary? - joerg - 245 */ 246 static u_short interactive_ports[8] = { 247 0, 513, 0, 0, 248 0, 21, 0, 23, 249 }; 250 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 251 #endif 252 253 /* almost every function needs these */ 254 #define STDDCL \ 255 struct ifnet *ifp = &sp->pp_if; \ 256 int debug = ifp->if_flags & IFF_DEBUG 257 258 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 259 struct sockaddr *dst, struct rtentry *rt); 260 261 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 262 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 263 264 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 265 struct mbuf *m); 266 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 267 u_char ident, u_short len, void *data); 268 /* static void sppp_cp_timeout(void *arg); */ 269 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 270 int newstate); 271 static void sppp_auth_send(const struct cp *cp, 272 struct sppp *sp, unsigned int type, unsigned int id, 273 ...); 274 275 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 276 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 277 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 278 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 279 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 280 281 static void sppp_null(struct sppp *sp); 282 283 static void sppp_lcp_init(struct sppp *sp); 284 static void sppp_lcp_up(struct sppp *sp); 285 static void sppp_lcp_down(struct sppp *sp); 286 static void sppp_lcp_open(struct sppp *sp); 287 static void sppp_lcp_close(struct sppp *sp); 288 static void sppp_lcp_TO(void *sp); 289 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 290 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 291 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 292 static void sppp_lcp_tlu(struct sppp *sp); 293 static void sppp_lcp_tld(struct sppp *sp); 294 static void sppp_lcp_tls(struct sppp *sp); 295 static void sppp_lcp_tlf(struct sppp *sp); 296 static void sppp_lcp_scr(struct sppp *sp); 297 static void sppp_lcp_check_and_close(struct sppp *sp); 298 static int sppp_ncp_check(struct sppp *sp); 299 300 static void sppp_ipcp_init(struct sppp *sp); 301 static void sppp_ipcp_up(struct sppp *sp); 302 static void sppp_ipcp_down(struct sppp *sp); 303 static void sppp_ipcp_open(struct sppp *sp); 304 static void sppp_ipcp_close(struct sppp *sp); 305 static void sppp_ipcp_TO(void *sp); 306 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 307 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 308 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 309 static void sppp_ipcp_tlu(struct sppp *sp); 310 static void sppp_ipcp_tld(struct sppp *sp); 311 static void sppp_ipcp_tls(struct sppp *sp); 312 static void sppp_ipcp_tlf(struct sppp *sp); 313 static void sppp_ipcp_scr(struct sppp *sp); 314 315 static void sppp_ipv6cp_init(struct sppp *sp); 316 static void sppp_ipv6cp_up(struct sppp *sp); 317 static void sppp_ipv6cp_down(struct sppp *sp); 318 static void sppp_ipv6cp_open(struct sppp *sp); 319 static void sppp_ipv6cp_close(struct sppp *sp); 320 static void sppp_ipv6cp_TO(void *sp); 321 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 322 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 323 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 324 static void sppp_ipv6cp_tlu(struct sppp *sp); 325 static void sppp_ipv6cp_tld(struct sppp *sp); 326 static void sppp_ipv6cp_tls(struct sppp *sp); 327 static void sppp_ipv6cp_tlf(struct sppp *sp); 328 static void sppp_ipv6cp_scr(struct sppp *sp); 329 330 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 331 static void sppp_pap_init(struct sppp *sp); 332 static void sppp_pap_open(struct sppp *sp); 333 static void sppp_pap_close(struct sppp *sp); 334 static void sppp_pap_TO(void *sp); 335 static void sppp_pap_my_TO(void *sp); 336 static void sppp_pap_tlu(struct sppp *sp); 337 static void sppp_pap_tld(struct sppp *sp); 338 static void sppp_pap_scr(struct sppp *sp); 339 340 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 341 static void sppp_chap_init(struct sppp *sp); 342 static void sppp_chap_open(struct sppp *sp); 343 static void sppp_chap_close(struct sppp *sp); 344 static void sppp_chap_TO(void *sp); 345 static void sppp_chap_tlu(struct sppp *sp); 346 static void sppp_chap_tld(struct sppp *sp); 347 static void sppp_chap_scr(struct sppp *sp); 348 349 static const char *sppp_auth_type_name(u_short proto, u_char type); 350 static const char *sppp_cp_type_name(u_char type); 351 static const char *sppp_dotted_quad(u_int32_t addr); 352 static const char *sppp_ipcp_opt_name(u_char opt); 353 #ifdef INET6 354 static const char *sppp_ipv6cp_opt_name(u_char opt); 355 #endif 356 static const char *sppp_lcp_opt_name(u_char opt); 357 static const char *sppp_phase_name(enum ppp_phase phase); 358 static const char *sppp_proto_name(u_short proto); 359 static const char *sppp_state_name(int state); 360 static int sppp_params(struct sppp *sp, int cmd, void *data); 361 static int sppp_strnlen(u_char *p, int max); 362 static void sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, 363 u_int32_t *srcmask); 364 static void sppp_keepalive(void *dummy); 365 static void sppp_phase_network(struct sppp *sp); 366 static void sppp_print_bytes(const u_char *p, u_short len); 367 static void sppp_print_string(const char *p, u_short len); 368 static void sppp_set_ip_addr(struct sppp *sp, u_int32_t src); 369 #ifdef INET6 370 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 371 struct in6_addr *dst, struct in6_addr *srcmask); 372 #ifdef IPV6CP_MYIFID_DYN 373 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 374 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 375 #endif 376 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 377 #endif 378 379 /* our control protocol descriptors */ 380 static const struct cp lcp = { 381 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 382 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 383 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 384 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 385 sppp_lcp_scr 386 }; 387 388 static const struct cp ipcp = { 389 PPP_IPCP, IDX_IPCP, 390 #ifdef INET 391 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 392 #else 393 0, 394 #endif 395 "ipcp", 396 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 397 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 398 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 399 sppp_ipcp_scr 400 }; 401 402 static const struct cp ipv6cp = { 403 PPP_IPV6CP, IDX_IPV6CP, 404 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 405 CP_NCP, 406 #else 407 0, 408 #endif 409 "ipv6cp", 410 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 411 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 412 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 413 sppp_ipv6cp_scr 414 }; 415 416 static const struct cp pap = { 417 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 418 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 419 sppp_pap_TO, 0, 0, 0, 420 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 421 sppp_pap_scr 422 }; 423 424 static const struct cp chap = { 425 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 426 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 427 sppp_chap_TO, 0, 0, 0, 428 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 429 sppp_chap_scr 430 }; 431 432 static const struct cp *cps[IDX_COUNT] = { 433 &lcp, /* IDX_LCP */ 434 &ipcp, /* IDX_IPCP */ 435 &ipv6cp, /* IDX_IPV6CP */ 436 &pap, /* IDX_PAP */ 437 &chap, /* IDX_CHAP */ 438 }; 439 440 441 /* 443 * Exported functions, comprising our interface to the lower layer. 444 */ 445 446 /* 447 * Process the received packet. 448 */ 449 void 450 sppp_input(struct ifnet *ifp, struct mbuf *m) 451 { 452 struct ppp_header *h = NULL; 453 struct ifqueue *inq = 0; 454 u_int16_t protocol; 455 int s; 456 struct sppp *sp = (struct sppp *)ifp; 457 int debug = ifp->if_flags & IFF_DEBUG; 458 459 if (ifp->if_flags & IFF_UP) 460 /* Count received bytes, add hardware framing */ 461 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 462 463 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 464 /* Too small packet, drop it. */ 465 if (debug) 466 log(LOG_DEBUG, 467 SPP_FMT "input packet is too small, %d bytes\n", 468 SPP_ARGS(ifp), m->m_pkthdr.len); 469 drop: 470 ++ifp->if_ierrors; 471 ++ifp->if_iqdrops; 472 m_freem (m); 473 return; 474 } 475 476 if (sp->pp_flags & PP_NOFRAMING) { 477 memcpy(&protocol, mtod(m, void *), 2); 478 protocol = ntohs(protocol); 479 m_adj(m, 2); 480 } else { 481 482 /* Get PPP header. */ 483 h = mtod (m, struct ppp_header*); 484 m_adj (m, PPP_HEADER_LEN); 485 486 switch (h->address) { 487 case PPP_ALLSTATIONS: 488 if (h->control != PPP_UI) 489 goto invalid; 490 if (sp->pp_flags & PP_CISCO) { 491 if (debug) 492 log(LOG_DEBUG, 493 SPP_FMT "PPP packet in Cisco mode " 494 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 495 SPP_ARGS(ifp), 496 h->address, h->control, ntohs(h->protocol)); 497 goto drop; 498 } 499 break; 500 case CISCO_MULTICAST: 501 case CISCO_UNICAST: 502 /* Don't check the control field here (RFC 1547). */ 503 if (! (sp->pp_flags & PP_CISCO)) { 504 if (debug) 505 log(LOG_DEBUG, 506 SPP_FMT "Cisco packet in PPP mode " 507 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 508 SPP_ARGS(ifp), 509 h->address, h->control, ntohs(h->protocol)); 510 goto drop; 511 } 512 switch (ntohs (h->protocol)) { 513 default: 514 ++ifp->if_noproto; 515 goto invalid; 516 case CISCO_KEEPALIVE: 517 sppp_cisco_input ((struct sppp*) ifp, m); 518 m_freem (m); 519 return; 520 #ifdef INET 521 case ETHERTYPE_IP: 522 schednetisr (NETISR_IP); 523 inq = &ipintrq; 524 break; 525 #endif 526 #ifdef INET6 527 case ETHERTYPE_IPV6: 528 schednetisr (NETISR_IPV6); 529 inq = &ip6intrq; 530 break; 531 #endif 532 #ifdef IPX 533 case ETHERTYPE_IPX: 534 schednetisr (NETISR_IPX); 535 inq = &ipxintrq; 536 break; 537 #endif 538 #ifdef NS 539 case ETHERTYPE_NS: 540 schednetisr (NETISR_NS); 541 inq = &nsintrq; 542 break; 543 #endif 544 } 545 goto queue_pkt; 546 default: /* Invalid PPP packet. */ 547 invalid: 548 if (debug) 549 log(LOG_DEBUG, 550 SPP_FMT "invalid input packet " 551 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 552 SPP_ARGS(ifp), 553 h->address, h->control, ntohs(h->protocol)); 554 goto drop; 555 } 556 protocol = ntohs (h->protocol); 557 } 558 559 switch (protocol) { 560 default: 561 if (sp->state[IDX_LCP] == STATE_OPENED) { 562 u_int16_t prot = htons(protocol); 563 sppp_cp_send (sp, PPP_LCP, PROTO_REJ, 564 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 565 &prot); 566 } 567 if (debug) 568 log(LOG_DEBUG, 569 SPP_FMT "invalid input protocol " 570 "<proto=0x%x>\n", SPP_ARGS(ifp), ntohs(protocol)); 571 ++ifp->if_noproto; 572 goto drop; 573 case PPP_LCP: 574 sppp_cp_input(&lcp, sp, m); 575 m_freem (m); 576 return; 577 case PPP_PAP: 578 if (sp->pp_phase >= PHASE_AUTHENTICATE) 579 sppp_pap_input(sp, m); 580 m_freem (m); 581 return; 582 case PPP_CHAP: 583 if (sp->pp_phase >= PHASE_AUTHENTICATE) 584 sppp_chap_input(sp, m); 585 m_freem (m); 586 return; 587 #ifdef INET 588 case PPP_IPCP: 589 if (sp->pp_phase == PHASE_NETWORK) 590 sppp_cp_input(&ipcp, sp, m); 591 m_freem (m); 592 return; 593 case PPP_IP: 594 if (sp->state[IDX_IPCP] == STATE_OPENED) { 595 schednetisr (NETISR_IP); 596 inq = &ipintrq; 597 } 598 break; 599 #endif 600 #ifdef INET6 601 case PPP_IPV6CP: 602 if (sp->pp_phase == PHASE_NETWORK) 603 sppp_cp_input(&ipv6cp, sp, m); 604 m_freem (m); 605 return; 606 607 case PPP_IPV6: 608 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 609 schednetisr (NETISR_IPV6); 610 inq = &ip6intrq; 611 } 612 break; 613 #endif 614 #ifdef IPX 615 case PPP_IPX: 616 /* IPX IPXCP not implemented yet */ 617 if (sp->pp_phase == PHASE_NETWORK) { 618 schednetisr (NETISR_IPX); 619 inq = &ipxintrq; 620 } 621 break; 622 #endif 623 #ifdef NS 624 case PPP_XNS: 625 /* XNS IDPCP not implemented yet */ 626 if (sp->pp_phase == PHASE_NETWORK) { 627 schednetisr (NETISR_NS); 628 inq = &nsintrq; 629 } 630 break; 631 #endif 632 #ifdef ISO 633 case PPP_ISO: 634 /* OSI NLCP not implemented yet */ 635 if (sp->pp_phase == PHASE_NETWORK) { 636 schednetisr (NETISR_ISO); 637 inq = &clnlintrq; 638 } 639 break; 640 #endif 641 } 642 643 queue_pkt: 644 if (! (ifp->if_flags & IFF_UP) || ! inq) 645 goto drop; 646 647 /* Check queue. */ 648 s = splnet(); 649 if (IF_QFULL (inq)) { 650 /* Queue overflow. */ 651 IF_DROP(inq); 652 splx(s); 653 if (debug) 654 log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n", 655 SPP_ARGS(ifp)); 656 goto drop; 657 } 658 IF_ENQUEUE(inq, m); 659 splx(s); 660 } 661 662 /* 663 * Enqueue transmit packet. 664 */ 665 static int 666 sppp_output(struct ifnet *ifp, struct mbuf *m, 667 struct sockaddr *dst, struct rtentry *rt) 668 { 669 struct sppp *sp = (struct sppp*) ifp; 670 struct ppp_header *h = NULL; 671 struct ifqueue *ifq = NULL; /* XXX */ 672 int s, len, rv = 0; 673 u_int16_t protocol; 674 ALTQ_DECL(struct altq_pktattr pktattr;) 675 676 s = splnet(); 677 678 if ((ifp->if_flags & IFF_UP) == 0 || 679 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 680 m_freem (m); 681 splx (s); 682 return (ENETDOWN); 683 } 684 685 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 686 /* 687 * Interface is not yet running, but auto-dial. Need 688 * to start LCP for it. 689 */ 690 ifp->if_flags |= IFF_RUNNING; 691 splx(s); 692 lcp.Open(sp); 693 s = splnet(); 694 } 695 696 /* 697 * If the queueing discipline needs packet classification, 698 * do it before prepending link headers. 699 */ 700 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 701 702 #ifdef INET 703 if (dst->sa_family == AF_INET) 704 { 705 /* Check mbuf length here??? */ 706 struct ip *ip = mtod (m, struct ip*); 707 struct tcphdr *tcp = (struct tcphdr*) ((int32_t*)ip + ip->ip_hl); 708 709 /* 710 * When using dynamic local IP address assignment by using 711 * 0.0.0.0 as a local address, the first TCP session will 712 * not connect because the local TCP checksum is computed 713 * using 0.0.0.0 which will later become our real IP address 714 * so the TCP checksum computed at the remote end will 715 * become invalid. So we 716 * - don't let packets with src ip addr 0 thru 717 * - we flag TCP packets with src ip 0 as an error 718 */ 719 720 if(ip->ip_src.s_addr == INADDR_ANY) /* -hm */ 721 { 722 m_freem(m); 723 splx(s); 724 if(ip->ip_p == IPPROTO_TCP) 725 return(EADDRNOTAVAIL); 726 else 727 return(0); 728 } 729 730 /* 731 * Put low delay, telnet, rlogin and ftp control packets 732 * in front of the queue. 733 */ 734 735 if (! IF_QFULL (&sp->pp_fastq) && 736 ((ip->ip_tos & IPTOS_LOWDELAY) || 737 ((ip->ip_p == IPPROTO_TCP && 738 m->m_len >= sizeof (struct ip) + sizeof (struct tcphdr) && 739 (INTERACTIVE (ntohs (tcp->th_sport)))) || 740 INTERACTIVE (ntohs (tcp->th_dport))))) 741 ifq = &sp->pp_fastq; 742 } 743 #endif 744 745 #ifdef INET6 746 if (dst->sa_family == AF_INET6) { 747 /* XXX do something tricky here? */ 748 } 749 #endif 750 751 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 752 /* 753 * Prepend general data packet PPP header. For now, IP only. 754 */ 755 M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT); 756 if (! m) { 757 if (ifp->if_flags & IFF_DEBUG) 758 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n", 759 SPP_ARGS(ifp)); 760 ++ifp->if_oerrors; 761 splx (s); 762 return (ENOBUFS); 763 } 764 /* 765 * May want to check size of packet 766 * (albeit due to the implementation it's always enough) 767 */ 768 h = mtod (m, struct ppp_header*); 769 if (sp->pp_flags & PP_CISCO) { 770 h->address = CISCO_UNICAST; /* unicast address */ 771 h->control = 0; 772 } else { 773 h->address = PPP_ALLSTATIONS; /* broadcast address */ 774 h->control = PPP_UI; /* Unnumbered Info */ 775 } 776 } 777 778 switch (dst->sa_family) { 779 #ifdef INET 780 case AF_INET: /* Internet Protocol */ 781 if (sp->pp_flags & PP_CISCO) 782 protocol = htons (ETHERTYPE_IP); 783 else { 784 /* 785 * Don't choke with an ENETDOWN early. It's 786 * possible that we just started dialing out, 787 * so don't drop the packet immediately. If 788 * we notice that we run out of buffer space 789 * below, we will however remember that we are 790 * not ready to carry IP packets, and return 791 * ENETDOWN, as opposed to ENOBUFS. 792 */ 793 protocol = htons(PPP_IP); 794 if (sp->state[IDX_IPCP] != STATE_OPENED) 795 rv = ENETDOWN; 796 } 797 break; 798 #endif 799 #ifdef INET6 800 case AF_INET6: /* Internet Protocol version 6 */ 801 if (sp->pp_flags & PP_CISCO) 802 protocol = htons (ETHERTYPE_IPV6); 803 else { 804 /* 805 * Don't choke with an ENETDOWN early. It's 806 * possible that we just started dialing out, 807 * so don't drop the packet immediately. If 808 * we notice that we run out of buffer space 809 * below, we will however remember that we are 810 * not ready to carry IP packets, and return 811 * ENETDOWN, as opposed to ENOBUFS. 812 */ 813 protocol = htons(PPP_IPV6); 814 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 815 rv = ENETDOWN; 816 } 817 break; 818 #endif 819 #ifdef NS 820 case AF_NS: /* Xerox NS Protocol */ 821 protocol = htons ((sp->pp_flags & PP_CISCO) ? 822 ETHERTYPE_NS : PPP_XNS); 823 break; 824 #endif 825 #ifdef IPX 826 case AF_IPX: /* Novell IPX Protocol */ 827 protocol = htons ((sp->pp_flags & PP_CISCO) ? 828 ETHERTYPE_IPX : PPP_IPX); 829 break; 830 #endif 831 #ifdef ISO 832 case AF_ISO: /* ISO OSI Protocol */ 833 if (sp->pp_flags & PP_CISCO) 834 goto nosupport; 835 protocol = htons (PPP_ISO); 836 break; 837 nosupport: 838 #endif 839 default: 840 m_freem (m); 841 ++ifp->if_oerrors; 842 splx (s); 843 return (EAFNOSUPPORT); 844 } 845 846 if (sp->pp_flags & PP_NOFRAMING) { 847 M_PREPEND (m, 2, M_DONTWAIT); 848 if (m == NULL) { 849 if (ifp->if_flags & IFF_DEBUG) 850 log(LOG_DEBUG, SPP_FMT "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 /* 862 * Queue message on interface, and start output if interface 863 * not yet active. 864 */ 865 len = m->m_pkthdr.len; 866 if (ifq != NULL 867 #ifdef ALTQ 868 && ALTQ_IS_ENABLED(&ifp->if_snd) == 0 869 #endif 870 ) { 871 if (IF_QFULL (ifq)) { 872 IF_DROP (&ifp->if_snd); 873 m_freem (m); 874 if (rv == 0) 875 rv = ENOBUFS; 876 } 877 IF_ENQUEUE(ifq, m); 878 } else 879 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, rv); 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 + additional hardware framing 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; 903 904 /* Initialize keepalive handler. */ 905 if (! spppq) { 906 callout_init(&keepalive_ch); 907 callout_reset(&keepalive_ch, hz * 10, sppp_keepalive, NULL); 908 } 909 910 /* Insert new entry into the keepalive list. */ 911 sp->pp_next = spppq; 912 spppq = sp; 913 914 sp->pp_if.if_type = IFT_PPP; 915 sp->pp_if.if_output = sppp_output; 916 sp->pp_fastq.ifq_maxlen = 32; 917 sp->pp_cpq.ifq_maxlen = 20; 918 sp->pp_loopcnt = 0; 919 sp->pp_alivecnt = 0; 920 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 921 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 922 sp->pp_phase = PHASE_DEAD; 923 sp->pp_up = lcp.Up; 924 sp->pp_down = lcp.Down; 925 926 if_alloc_sadl(ifp); 927 928 sppp_lcp_init(sp); 929 sppp_ipcp_init(sp); 930 sppp_ipv6cp_init(sp); 931 sppp_pap_init(sp); 932 sppp_chap_init(sp); 933 } 934 935 void 936 sppp_detach(struct ifnet *ifp) 937 { 938 struct sppp **q, *p, *sp = (struct sppp*) ifp; 939 int i; 940 941 /* Remove the entry from the keepalive list. */ 942 for (q = &spppq; (p = *q); q = &p->pp_next) 943 if (p == sp) { 944 *q = p->pp_next; 945 break; 946 } 947 948 /* Stop keepalive handler. */ 949 if (! spppq) { 950 callout_stop(&keepalive_ch); 951 } 952 953 for (i = 0; i < IDX_COUNT; i++) { 954 callout_stop(&sp->ch[i]); 955 } 956 callout_stop(&sp->pap_my_to_ch); 957 958 if_free_sadl(ifp); 959 } 960 961 /* 962 * Flush the interface output queue. 963 */ 964 void 965 sppp_flush(struct ifnet *ifp) 966 { 967 struct sppp *sp = (struct sppp*) ifp; 968 969 IFQ_PURGE (&sp->pp_if.if_snd); 970 IF_PURGE (&sp->pp_fastq); 971 IF_PURGE (&sp->pp_cpq); 972 } 973 974 /* 975 * Check if the output queue is empty. 976 */ 977 int 978 sppp_isempty(struct ifnet *ifp) 979 { 980 struct sppp *sp = (struct sppp*) ifp; 981 int empty, s; 982 983 s = splnet(); 984 empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head && 985 !sp->pp_if.if_snd.ifq_head; 986 splx(s); 987 return (empty); 988 } 989 990 /* 991 * Get next packet to send. 992 */ 993 struct mbuf * 994 sppp_dequeue(struct ifnet *ifp) 995 { 996 struct sppp *sp = (struct sppp*) ifp; 997 struct mbuf *m; 998 int s; 999 1000 s = splnet(); 1001 /* 1002 * Process only the control protocol queue until we have at 1003 * least one NCP open. 1004 * 1005 * Do always serve all three queues in Cisco mode. 1006 */ 1007 IF_DEQUEUE(&sp->pp_cpq, m); 1008 if (m == NULL && 1009 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1010 IF_DEQUEUE(&sp->pp_fastq, m); 1011 if (m == NULL) 1012 IF_DEQUEUE (&sp->pp_if.if_snd, m); 1013 } 1014 splx(s); 1015 return m; 1016 } 1017 1018 /* 1019 * Pick the next packet, do not remove it from the queue. 1020 */ 1021 struct mbuf * 1022 sppp_pick(struct ifnet *ifp) 1023 { 1024 struct sppp *sp = (struct sppp*)ifp; 1025 struct mbuf *m; 1026 int s; 1027 1028 s= splnet (); 1029 1030 m = sp->pp_cpq.ifq_head; 1031 if (m == NULL && 1032 (sp->pp_phase == PHASE_NETWORK || 1033 (sp->pp_flags & PP_CISCO) != 0)) 1034 if ((m = sp->pp_fastq.ifq_head) == NULL) 1035 m = sp->pp_if.if_snd.ifq_head; 1036 splx (s); 1037 return (m); 1038 } 1039 1040 /* 1041 * Process an ioctl request. Called on low priority level. 1042 */ 1043 int 1044 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1045 { 1046 struct ifreq *ifr = (struct ifreq*) data; 1047 struct sppp *sp = (struct sppp*) ifp; 1048 int s, rv, going_up, going_down, newmode; 1049 1050 s = splnet(); 1051 rv = 0; 1052 switch (cmd) { 1053 case SIOCAIFADDR: 1054 case SIOCSIFDSTADDR: 1055 break; 1056 1057 case SIOCSIFADDR: 1058 if_up(ifp); 1059 /* fall through... */ 1060 1061 case SIOCSIFFLAGS: 1062 going_up = ifp->if_flags & IFF_UP && 1063 (ifp->if_flags & IFF_RUNNING) == 0; 1064 going_down = (ifp->if_flags & IFF_UP) == 0 && 1065 ifp->if_flags & IFF_RUNNING; 1066 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1067 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1068 /* sanity */ 1069 newmode = IFF_PASSIVE; 1070 ifp->if_flags &= ~IFF_AUTO; 1071 } 1072 1073 if (going_up || going_down) 1074 lcp.Close(sp); 1075 if (going_up && newmode == 0) { 1076 /* neither auto-dial nor passive */ 1077 ifp->if_flags |= IFF_RUNNING; 1078 if (!(sp->pp_flags & PP_CISCO)) 1079 lcp.Open(sp); 1080 } else if (going_down) { 1081 sppp_flush(ifp); 1082 ifp->if_flags &= ~IFF_RUNNING; 1083 } 1084 1085 break; 1086 1087 #ifdef SIOCSIFMTU 1088 #ifndef ifr_mtu 1089 #define ifr_mtu ifr_metric 1090 #endif 1091 case SIOCSIFMTU: 1092 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) 1093 return (EINVAL); 1094 ifp->if_mtu = ifr->ifr_mtu; 1095 break; 1096 #endif 1097 #ifdef SLIOCSETMTU 1098 case SLIOCSETMTU: 1099 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru) 1100 return (EINVAL); 1101 ifp->if_mtu = *(short*)data; 1102 break; 1103 #endif 1104 #ifdef SIOCGIFMTU 1105 case SIOCGIFMTU: 1106 ifr->ifr_mtu = ifp->if_mtu; 1107 break; 1108 #endif 1109 #ifdef SLIOCGETMTU 1110 case SLIOCGETMTU: 1111 *(short*)data = ifp->if_mtu; 1112 break; 1113 #endif 1114 case SIOCADDMULTI: 1115 case SIOCDELMULTI: 1116 break; 1117 1118 case SIOCGIFGENERIC: 1119 case SIOCSIFGENERIC: 1120 rv = sppp_params(sp, cmd, data); 1121 break; 1122 1123 default: 1124 rv = ENOTTY; 1125 } 1126 splx(s); 1127 return rv; 1128 } 1129 1130 1131 /* 1133 * Cisco framing implementation. 1134 */ 1135 1136 /* 1137 * Handle incoming Cisco keepalive protocol packets. 1138 */ 1139 static void 1140 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1141 { 1142 STDDCL; 1143 struct cisco_packet *h; 1144 u_int32_t me, mymask; 1145 1146 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1147 if (debug) 1148 log(LOG_DEBUG, 1149 SPP_FMT "cisco invalid packet length: %d bytes\n", 1150 SPP_ARGS(ifp), m->m_pkthdr.len); 1151 return; 1152 } 1153 h = mtod (m, struct cisco_packet*); 1154 if (debug) 1155 log(LOG_DEBUG, 1156 SPP_FMT "cisco input: %d bytes " 1157 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1158 SPP_ARGS(ifp), m->m_pkthdr.len, 1159 ntohl (h->type), h->par1, h->par2, (u_int)h->rel, 1160 (u_int)h->time0, (u_int)h->time1); 1161 switch (ntohl (h->type)) { 1162 default: 1163 if (debug) 1164 addlog(SPP_FMT "cisco unknown packet type: 0x%x\n", 1165 SPP_ARGS(ifp), ntohl (h->type)); 1166 break; 1167 case CISCO_ADDR_REPLY: 1168 /* Reply on address request, ignore */ 1169 break; 1170 case CISCO_KEEPALIVE_REQ: 1171 sp->pp_alivecnt = 0; 1172 sp->pp_rseq[IDX_LCP] = ntohl (h->par1); 1173 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1174 /* Local and remote sequence numbers are equal. 1175 * Probably, the line is in loopback mode. */ 1176 if (sp->pp_loopcnt >= MAXALIVECNT) { 1177 printf (SPP_FMT "loopback\n", 1178 SPP_ARGS(ifp)); 1179 sp->pp_loopcnt = 0; 1180 if (ifp->if_flags & IFF_UP) { 1181 if_down (ifp); 1182 IF_PURGE (&sp->pp_cpq); 1183 } 1184 } 1185 ++sp->pp_loopcnt; 1186 1187 /* Generate new local sequence number */ 1188 sp->pp_seq[IDX_LCP] = random(); 1189 break; 1190 } 1191 sp->pp_loopcnt = 0; 1192 if (! (ifp->if_flags & IFF_UP) && 1193 (ifp->if_flags & IFF_RUNNING)) { 1194 if_up(ifp); 1195 printf (SPP_FMT "up\n", SPP_ARGS(ifp)); 1196 } 1197 break; 1198 case CISCO_ADDR_REQ: 1199 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1200 if (me != 0L) 1201 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1202 break; 1203 } 1204 } 1205 1206 /* 1207 * Send Cisco keepalive packet. 1208 */ 1209 static void 1210 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1211 { 1212 STDDCL; 1213 struct ppp_header *h; 1214 struct cisco_packet *ch; 1215 struct mbuf *m; 1216 u_int32_t t = (time.tv_sec - boottime.tv_sec) * 1000; 1217 1218 MGETHDR (m, M_DONTWAIT, MT_DATA); 1219 if (! m) 1220 return; 1221 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1222 m->m_pkthdr.rcvif = 0; 1223 1224 h = mtod (m, struct ppp_header*); 1225 h->address = CISCO_MULTICAST; 1226 h->control = 0; 1227 h->protocol = htons (CISCO_KEEPALIVE); 1228 1229 ch = (struct cisco_packet*) (h + 1); 1230 ch->type = htonl (type); 1231 ch->par1 = htonl (par1); 1232 ch->par2 = htonl (par2); 1233 ch->rel = -1; 1234 1235 ch->time0 = htons ((u_short) (t >> 16)); 1236 ch->time1 = htons ((u_short) t); 1237 1238 if (debug) 1239 log(LOG_DEBUG, 1240 SPP_FMT "cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1241 SPP_ARGS(ifp), ntohl (ch->type), ch->par1, 1242 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1243 (u_int)ch->time1); 1244 1245 if (IF_QFULL (&sp->pp_cpq)) { 1246 IF_DROP (&sp->pp_fastq); 1247 IF_DROP (&ifp->if_snd); 1248 m_freem (m); 1249 } else 1250 IF_ENQUEUE (&sp->pp_cpq, m); 1251 if (! (ifp->if_flags & IFF_OACTIVE)) 1252 (*ifp->if_start) (ifp); 1253 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1254 } 1255 1256 /* 1258 * PPP protocol implementation. 1259 */ 1260 1261 /* 1262 * Send PPP control protocol packet. 1263 */ 1264 static void 1265 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1266 u_char ident, u_short len, void *data) 1267 { 1268 STDDCL; 1269 struct lcp_header *lh; 1270 struct mbuf *m; 1271 size_t pkthdrlen; 1272 1273 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1274 1275 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1276 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1277 MGETHDR (m, M_DONTWAIT, MT_DATA); 1278 if (! m) 1279 return; 1280 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1281 m->m_pkthdr.rcvif = 0; 1282 1283 if (sp->pp_flags & PP_NOFRAMING) { 1284 *mtod(m, u_int16_t*) = htons(proto); 1285 lh = (struct lcp_header*)(mtod(m, u_int8_t*) + 2); 1286 } else { 1287 struct ppp_header *h; 1288 h = mtod (m, struct ppp_header*); 1289 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1290 h->control = PPP_UI; /* Unnumbered Info */ 1291 h->protocol = htons (proto); /* Link Control Protocol */ 1292 lh = (struct lcp_header*) (h + 1); 1293 } 1294 lh->type = type; 1295 lh->ident = ident; 1296 lh->len = htons (LCP_HEADER_LEN + len); 1297 if (len) 1298 bcopy (data, lh+1, len); 1299 1300 if (debug) { 1301 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 1302 SPP_ARGS(ifp), 1303 sppp_proto_name(proto), 1304 sppp_cp_type_name (lh->type), lh->ident, 1305 ntohs (lh->len)); 1306 if (len) 1307 sppp_print_bytes ((u_char*) (lh+1), len); 1308 addlog(">\n"); 1309 } 1310 if (IF_QFULL (&sp->pp_cpq)) { 1311 IF_DROP (&sp->pp_fastq); 1312 IF_DROP (&ifp->if_snd); 1313 m_freem (m); 1314 ++ifp->if_oerrors; 1315 } else 1316 IF_ENQUEUE (&sp->pp_cpq, m); 1317 if (! (ifp->if_flags & IFF_OACTIVE)) 1318 (*ifp->if_start) (ifp); 1319 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1320 } 1321 1322 /* 1323 * Handle incoming PPP control protocol packets. 1324 */ 1325 static void 1326 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1327 { 1328 STDDCL; 1329 struct lcp_header *h; 1330 int len = m->m_pkthdr.len; 1331 int rv; 1332 u_char *p; 1333 u_int32_t u32; 1334 1335 if (len < 4) { 1336 if (debug) 1337 log(LOG_DEBUG, 1338 SPP_FMT "%s invalid packet length: %d bytes\n", 1339 SPP_ARGS(ifp), cp->name, len); 1340 return; 1341 } 1342 h = mtod (m, struct lcp_header*); 1343 if (debug) { 1344 log(LOG_DEBUG, 1345 SPP_FMT "%s input(%s): <%s id=0x%x len=%d", 1346 SPP_ARGS(ifp), cp->name, 1347 sppp_state_name(sp->state[cp->protoidx]), 1348 sppp_cp_type_name (h->type), h->ident, ntohs (h->len)); 1349 if (len > 4) 1350 sppp_print_bytes ((u_char*) (h+1), len-4); 1351 addlog(">\n"); 1352 } 1353 if (len > ntohs (h->len)) 1354 len = ntohs (h->len); 1355 p = (u_char *)(h + 1); 1356 switch (h->type) { 1357 case CONF_REQ: 1358 if (len < 4) { 1359 if (debug) 1360 addlog(SPP_FMT "%s invalid conf-req length %d\n", 1361 SPP_ARGS(ifp), cp->name, 1362 len); 1363 ++ifp->if_ierrors; 1364 break; 1365 } 1366 /* handle states where RCR doesn't get a SCA/SCN */ 1367 switch (sp->state[cp->protoidx]) { 1368 case STATE_CLOSING: 1369 case STATE_STOPPING: 1370 return; 1371 case STATE_CLOSED: 1372 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1373 0, 0); 1374 return; 1375 } 1376 rv = (cp->RCR)(sp, h, len); 1377 switch (sp->state[cp->protoidx]) { 1378 case STATE_OPENED: 1379 (cp->tld)(sp); 1380 (cp->scr)(sp); 1381 /* fall through... */ 1382 case STATE_ACK_SENT: 1383 case STATE_REQ_SENT: 1384 sppp_cp_change_state(cp, sp, rv? 1385 STATE_ACK_SENT: STATE_REQ_SENT); 1386 break; 1387 case STATE_STOPPED: 1388 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1389 (cp->scr)(sp); 1390 sppp_cp_change_state(cp, sp, rv? 1391 STATE_ACK_SENT: STATE_REQ_SENT); 1392 break; 1393 case STATE_ACK_RCVD: 1394 if (rv) { 1395 sppp_cp_change_state(cp, sp, STATE_OPENED); 1396 if (debug) 1397 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1398 SPP_ARGS(ifp), 1399 cp->name); 1400 (cp->tlu)(sp); 1401 } else 1402 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1403 break; 1404 default: 1405 printf(SPP_FMT "%s illegal %s in state %s\n", 1406 SPP_ARGS(ifp), cp->name, 1407 sppp_cp_type_name(h->type), 1408 sppp_state_name(sp->state[cp->protoidx])); 1409 ++ifp->if_ierrors; 1410 } 1411 break; 1412 case CONF_ACK: 1413 if (h->ident != sp->confid[cp->protoidx]) { 1414 if (debug) 1415 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1416 SPP_ARGS(ifp), cp->name, 1417 h->ident, sp->confid[cp->protoidx]); 1418 ++ifp->if_ierrors; 1419 break; 1420 } 1421 switch (sp->state[cp->protoidx]) { 1422 case STATE_CLOSED: 1423 case STATE_STOPPED: 1424 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1425 break; 1426 case STATE_CLOSING: 1427 case STATE_STOPPING: 1428 break; 1429 case STATE_REQ_SENT: 1430 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1431 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1432 break; 1433 case STATE_OPENED: 1434 (cp->tld)(sp); 1435 /* fall through */ 1436 case STATE_ACK_RCVD: 1437 (cp->scr)(sp); 1438 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1439 break; 1440 case STATE_ACK_SENT: 1441 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1442 sppp_cp_change_state(cp, sp, STATE_OPENED); 1443 if (debug) 1444 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1445 SPP_ARGS(ifp), cp->name); 1446 (cp->tlu)(sp); 1447 break; 1448 default: 1449 printf(SPP_FMT "%s illegal %s in state %s\n", 1450 SPP_ARGS(ifp), cp->name, 1451 sppp_cp_type_name(h->type), 1452 sppp_state_name(sp->state[cp->protoidx])); 1453 ++ifp->if_ierrors; 1454 } 1455 break; 1456 case CONF_NAK: 1457 case CONF_REJ: 1458 if (h->ident != sp->confid[cp->protoidx]) { 1459 if (debug) 1460 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1461 SPP_ARGS(ifp), cp->name, 1462 h->ident, sp->confid[cp->protoidx]); 1463 ++ifp->if_ierrors; 1464 break; 1465 } 1466 if (h->type == CONF_NAK) 1467 (cp->RCN_nak)(sp, h, len); 1468 else /* CONF_REJ */ 1469 (cp->RCN_rej)(sp, h, len); 1470 1471 switch (sp->state[cp->protoidx]) { 1472 case STATE_CLOSED: 1473 case STATE_STOPPED: 1474 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1475 break; 1476 case STATE_REQ_SENT: 1477 case STATE_ACK_SENT: 1478 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1479 (cp->scr)(sp); 1480 break; 1481 case STATE_OPENED: 1482 (cp->tld)(sp); 1483 /* fall through */ 1484 case STATE_ACK_RCVD: 1485 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1486 (cp->scr)(sp); 1487 break; 1488 case STATE_CLOSING: 1489 case STATE_STOPPING: 1490 break; 1491 default: 1492 printf(SPP_FMT "%s illegal %s in state %s\n", 1493 SPP_ARGS(ifp), cp->name, 1494 sppp_cp_type_name(h->type), 1495 sppp_state_name(sp->state[cp->protoidx])); 1496 ++ifp->if_ierrors; 1497 } 1498 break; 1499 1500 case TERM_REQ: 1501 switch (sp->state[cp->protoidx]) { 1502 case STATE_ACK_RCVD: 1503 case STATE_ACK_SENT: 1504 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1505 /* fall through */ 1506 case STATE_CLOSED: 1507 case STATE_STOPPED: 1508 case STATE_CLOSING: 1509 case STATE_STOPPING: 1510 case STATE_REQ_SENT: 1511 sta: 1512 /* Send Terminate-Ack packet. */ 1513 if (debug) 1514 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n", 1515 SPP_ARGS(ifp), cp->name); 1516 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1517 break; 1518 case STATE_OPENED: 1519 (cp->tld)(sp); 1520 sp->rst_counter[cp->protoidx] = 0; 1521 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1522 goto sta; 1523 break; 1524 default: 1525 printf(SPP_FMT "%s illegal %s in state %s\n", 1526 SPP_ARGS(ifp), cp->name, 1527 sppp_cp_type_name(h->type), 1528 sppp_state_name(sp->state[cp->protoidx])); 1529 ++ifp->if_ierrors; 1530 } 1531 break; 1532 case TERM_ACK: 1533 switch (sp->state[cp->protoidx]) { 1534 case STATE_CLOSED: 1535 case STATE_STOPPED: 1536 case STATE_REQ_SENT: 1537 case STATE_ACK_SENT: 1538 break; 1539 case STATE_CLOSING: 1540 (cp->tlf)(sp); 1541 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1542 sppp_lcp_check_and_close(sp); 1543 break; 1544 case STATE_STOPPING: 1545 (cp->tlf)(sp); 1546 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1547 sppp_lcp_check_and_close(sp); 1548 break; 1549 case STATE_ACK_RCVD: 1550 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1551 break; 1552 case STATE_OPENED: 1553 (cp->tld)(sp); 1554 (cp->scr)(sp); 1555 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1556 break; 1557 default: 1558 printf(SPP_FMT "%s illegal %s in state %s\n", 1559 SPP_ARGS(ifp), cp->name, 1560 sppp_cp_type_name(h->type), 1561 sppp_state_name(sp->state[cp->protoidx])); 1562 ++ifp->if_ierrors; 1563 } 1564 break; 1565 case CODE_REJ: 1566 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1567 log(LOG_INFO, 1568 SPP_FMT "%s: ignoring RXJ (%s) for code ?, " 1569 "danger will robinson\n", 1570 SPP_ARGS(ifp), cp->name, 1571 sppp_cp_type_name(h->type)); 1572 switch (sp->state[cp->protoidx]) { 1573 case STATE_CLOSED: 1574 case STATE_STOPPED: 1575 case STATE_REQ_SENT: 1576 case STATE_ACK_SENT: 1577 case STATE_CLOSING: 1578 case STATE_STOPPING: 1579 case STATE_OPENED: 1580 break; 1581 case STATE_ACK_RCVD: 1582 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1583 break; 1584 default: 1585 printf(SPP_FMT "%s illegal %s in state %s\n", 1586 SPP_ARGS(ifp), cp->name, 1587 sppp_cp_type_name(h->type), 1588 sppp_state_name(sp->state[cp->protoidx])); 1589 ++ifp->if_ierrors; 1590 } 1591 break; 1592 case PROTO_REJ: 1593 { 1594 int catastrophic; 1595 const struct cp *upper; 1596 int i; 1597 u_int16_t proto; 1598 1599 catastrophic = 0; 1600 upper = NULL; 1601 proto = p[0] << 8 | p[1]; 1602 for (i = 0; i < IDX_COUNT; i++) { 1603 if (cps[i]->proto == proto) { 1604 upper = cps[i]; 1605 break; 1606 } 1607 } 1608 if (upper == NULL) 1609 catastrophic++; 1610 1611 log(LOG_INFO, 1612 SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1613 SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+', 1614 sppp_cp_type_name(h->type), proto, 1615 upper ? upper->name : "unknown", 1616 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1617 1618 /* 1619 * if we got RXJ+ against conf-req, the peer does not implement 1620 * this particular protocol type. terminate the protocol. 1621 */ 1622 if (upper && !catastrophic) { 1623 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1624 upper->Close(sp); 1625 break; 1626 } 1627 } 1628 1629 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1630 switch (sp->state[cp->protoidx]) { 1631 case STATE_CLOSED: 1632 case STATE_STOPPED: 1633 case STATE_REQ_SENT: 1634 case STATE_ACK_SENT: 1635 case STATE_CLOSING: 1636 case STATE_STOPPING: 1637 case STATE_OPENED: 1638 break; 1639 case STATE_ACK_RCVD: 1640 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1641 break; 1642 default: 1643 printf(SPP_FMT "%s illegal %s in state %s\n", 1644 SPP_ARGS(ifp), cp->name, 1645 sppp_cp_type_name(h->type), 1646 sppp_state_name(sp->state[cp->protoidx])); 1647 ++ifp->if_ierrors; 1648 } 1649 break; 1650 } 1651 case DISC_REQ: 1652 if (cp->proto != PPP_LCP) 1653 goto illegal; 1654 /* Discard the packet. */ 1655 break; 1656 case ECHO_REQ: 1657 if (cp->proto != PPP_LCP) 1658 goto illegal; 1659 if (sp->state[cp->protoidx] != STATE_OPENED) { 1660 if (debug) 1661 addlog(SPP_FMT "lcp echo req but lcp closed\n", 1662 SPP_ARGS(ifp)); 1663 ++ifp->if_ierrors; 1664 break; 1665 } 1666 if (len < 8) { 1667 if (debug) 1668 addlog(SPP_FMT "invalid lcp echo request " 1669 "packet length: %d bytes\n", 1670 SPP_ARGS(ifp), len); 1671 break; 1672 } 1673 memcpy(&u32, h + 1, sizeof u32); 1674 if (ntohl(u32) == sp->lcp.magic) { 1675 /* Line loopback mode detected. */ 1676 printf(SPP_FMT "loopback\n", SPP_ARGS(ifp)); 1677 if_down (ifp); 1678 IF_PURGE (&sp->pp_cpq); 1679 1680 /* Shut down the PPP link. */ 1681 /* XXX */ 1682 lcp.Down(sp); 1683 lcp.Up(sp); 1684 break; 1685 } 1686 u32 = htonl(sp->lcp.magic); 1687 memcpy(h + 1, &u32, sizeof u32); 1688 if (debug) 1689 addlog(SPP_FMT "got lcp echo req, sending echo rep\n", 1690 SPP_ARGS(ifp)); 1691 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1); 1692 break; 1693 case ECHO_REPLY: 1694 if (cp->proto != PPP_LCP) 1695 goto illegal; 1696 if (h->ident != sp->lcp.echoid) { 1697 ++ifp->if_ierrors; 1698 break; 1699 } 1700 if (len < 8) { 1701 if (debug) 1702 addlog(SPP_FMT "lcp invalid echo reply " 1703 "packet length: %d bytes\n", 1704 SPP_ARGS(ifp), len); 1705 break; 1706 } 1707 if (debug) 1708 addlog(SPP_FMT "lcp got echo rep\n", 1709 SPP_ARGS(ifp)); 1710 memcpy(&u32, h + 1, sizeof u32); 1711 if (ntohl(u32) != sp->lcp.magic) 1712 sp->pp_alivecnt = 0; 1713 break; 1714 default: 1715 /* Unknown packet type -- send Code-Reject packet. */ 1716 illegal: 1717 if (debug) 1718 addlog(SPP_FMT "%s send code-rej for 0x%x\n", 1719 SPP_ARGS(ifp), cp->name, h->type); 1720 sppp_cp_send(sp, cp->proto, CODE_REJ, 1721 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1722 ++ifp->if_ierrors; 1723 } 1724 } 1725 1726 1727 /* 1728 * The generic part of all Up/Down/Open/Close/TO event handlers. 1729 * Basically, the state transition handling in the automaton. 1730 */ 1731 static void 1732 sppp_up_event(const struct cp *cp, struct sppp *sp) 1733 { 1734 STDDCL; 1735 1736 if (debug) 1737 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n", 1738 SPP_ARGS(ifp), cp->name, 1739 sppp_state_name(sp->state[cp->protoidx])); 1740 1741 switch (sp->state[cp->protoidx]) { 1742 case STATE_INITIAL: 1743 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1744 break; 1745 case STATE_STARTING: 1746 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1747 (cp->scr)(sp); 1748 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1749 break; 1750 default: 1751 printf(SPP_FMT "%s illegal up in state %s\n", 1752 SPP_ARGS(ifp), cp->name, 1753 sppp_state_name(sp->state[cp->protoidx])); 1754 } 1755 } 1756 1757 static void 1758 sppp_down_event(const struct cp *cp, struct sppp *sp) 1759 { 1760 STDDCL; 1761 1762 if (debug) 1763 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n", 1764 SPP_ARGS(ifp), cp->name, 1765 sppp_state_name(sp->state[cp->protoidx])); 1766 1767 switch (sp->state[cp->protoidx]) { 1768 case STATE_CLOSED: 1769 case STATE_CLOSING: 1770 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1771 break; 1772 case STATE_STOPPED: 1773 (cp->tls)(sp); 1774 /* fall through */ 1775 case STATE_STOPPING: 1776 case STATE_REQ_SENT: 1777 case STATE_ACK_RCVD: 1778 case STATE_ACK_SENT: 1779 sppp_cp_change_state(cp, sp, STATE_STARTING); 1780 break; 1781 case STATE_OPENED: 1782 (cp->tld)(sp); 1783 sppp_cp_change_state(cp, sp, STATE_STARTING); 1784 break; 1785 default: 1786 printf(SPP_FMT "%s illegal down in state %s\n", 1787 SPP_ARGS(ifp), cp->name, 1788 sppp_state_name(sp->state[cp->protoidx])); 1789 } 1790 } 1791 1792 1793 static void 1794 sppp_open_event(const struct cp *cp, struct sppp *sp) 1795 { 1796 STDDCL; 1797 1798 if (debug) 1799 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n", 1800 SPP_ARGS(ifp), cp->name, 1801 sppp_state_name(sp->state[cp->protoidx])); 1802 1803 switch (sp->state[cp->protoidx]) { 1804 case STATE_INITIAL: 1805 (cp->tls)(sp); 1806 sppp_cp_change_state(cp, sp, STATE_STARTING); 1807 break; 1808 case STATE_STARTING: 1809 break; 1810 case STATE_CLOSED: 1811 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1812 (cp->scr)(sp); 1813 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1814 break; 1815 case STATE_STOPPED: 1816 case STATE_STOPPING: 1817 case STATE_REQ_SENT: 1818 case STATE_ACK_RCVD: 1819 case STATE_ACK_SENT: 1820 case STATE_OPENED: 1821 break; 1822 case STATE_CLOSING: 1823 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1824 break; 1825 } 1826 } 1827 1828 1829 static void 1830 sppp_close_event(const struct cp *cp, struct sppp *sp) 1831 { 1832 STDDCL; 1833 1834 if (debug) 1835 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n", 1836 SPP_ARGS(ifp), cp->name, 1837 sppp_state_name(sp->state[cp->protoidx])); 1838 1839 switch (sp->state[cp->protoidx]) { 1840 case STATE_INITIAL: 1841 case STATE_CLOSED: 1842 case STATE_CLOSING: 1843 break; 1844 case STATE_STARTING: 1845 (cp->tlf)(sp); 1846 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1847 break; 1848 case STATE_STOPPED: 1849 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1850 break; 1851 case STATE_STOPPING: 1852 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1853 break; 1854 case STATE_OPENED: 1855 (cp->tld)(sp); 1856 /* fall through */ 1857 case STATE_REQ_SENT: 1858 case STATE_ACK_RCVD: 1859 case STATE_ACK_SENT: 1860 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1861 sppp_cp_send(sp, cp->proto, TERM_REQ, 1862 ++sp->pp_seq[cp->protoidx], 0, 0); 1863 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1864 break; 1865 } 1866 } 1867 1868 static void 1869 sppp_to_event(const struct cp *cp, struct sppp *sp) 1870 { 1871 STDDCL; 1872 int s; 1873 1874 s = splnet(); 1875 if (debug) 1876 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n", 1877 SPP_ARGS(ifp), cp->name, 1878 sppp_state_name(sp->state[cp->protoidx]), 1879 sp->rst_counter[cp->protoidx]); 1880 1881 if (--sp->rst_counter[cp->protoidx] < 0) 1882 /* TO- event */ 1883 switch (sp->state[cp->protoidx]) { 1884 case STATE_CLOSING: 1885 (cp->tlf)(sp); 1886 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1887 sppp_lcp_check_and_close(sp); 1888 break; 1889 case STATE_STOPPING: 1890 (cp->tlf)(sp); 1891 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1892 sppp_lcp_check_and_close(sp); 1893 break; 1894 case STATE_REQ_SENT: 1895 case STATE_ACK_RCVD: 1896 case STATE_ACK_SENT: 1897 (cp->tlf)(sp); 1898 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1899 sppp_lcp_check_and_close(sp); 1900 break; 1901 } 1902 else 1903 /* TO+ event */ 1904 switch (sp->state[cp->protoidx]) { 1905 case STATE_CLOSING: 1906 case STATE_STOPPING: 1907 sppp_cp_send(sp, cp->proto, TERM_REQ, 1908 ++sp->pp_seq[cp->protoidx], 0, 0); 1909 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1910 cp->TO, sp); 1911 break; 1912 case STATE_REQ_SENT: 1913 case STATE_ACK_RCVD: 1914 (cp->scr)(sp); 1915 /* sppp_cp_change_state() will restart the timer */ 1916 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1917 break; 1918 case STATE_ACK_SENT: 1919 (cp->scr)(sp); 1920 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1921 cp->TO, sp); 1922 break; 1923 } 1924 1925 splx(s); 1926 } 1927 1928 /* 1929 * Change the state of a control protocol in the state automaton. 1930 * Takes care of starting/stopping the restart timer. 1931 */ 1932 void 1933 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1934 { 1935 sp->state[cp->protoidx] = newstate; 1936 callout_stop(&sp->ch[cp->protoidx]); 1937 switch (newstate) { 1938 case STATE_INITIAL: 1939 case STATE_STARTING: 1940 case STATE_CLOSED: 1941 case STATE_STOPPED: 1942 case STATE_OPENED: 1943 break; 1944 case STATE_CLOSING: 1945 case STATE_STOPPING: 1946 case STATE_REQ_SENT: 1947 case STATE_ACK_RCVD: 1948 case STATE_ACK_SENT: 1949 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1950 cp->TO, sp); 1951 break; 1952 } 1953 } 1954 /* 1956 *--------------------------------------------------------------------------* 1957 * * 1958 * The LCP implementation. * 1959 * * 1960 *--------------------------------------------------------------------------* 1961 */ 1962 static void 1963 sppp_lcp_init(struct sppp *sp) 1964 { 1965 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1966 sp->lcp.magic = 0; 1967 sp->state[IDX_LCP] = STATE_INITIAL; 1968 sp->fail_counter[IDX_LCP] = 0; 1969 sp->pp_seq[IDX_LCP] = 0; 1970 sp->pp_rseq[IDX_LCP] = 0; 1971 sp->lcp.protos = 0; 1972 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 1973 1974 /* 1975 * Initialize counters and timeout values. Note that we don't 1976 * use the 3 seconds suggested in RFC 1661 since we are likely 1977 * running on a fast link. XXX We should probably implement 1978 * the exponential backoff option. Note that these values are 1979 * relevant for all control protocols, not just LCP only. 1980 */ 1981 sp->lcp.timeout = 1 * hz; 1982 sp->lcp.max_terminate = 2; 1983 sp->lcp.max_configure = 10; 1984 sp->lcp.max_failure = 10; 1985 callout_init(&sp->ch[IDX_LCP]); 1986 } 1987 1988 static void 1989 sppp_lcp_up(struct sppp *sp) 1990 { 1991 STDDCL; 1992 1993 /* 1994 * If this interface is passive or dial-on-demand, and we are 1995 * still in Initial state, it means we've got an incoming 1996 * call. Activate the interface. 1997 */ 1998 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 1999 if (debug) 2000 log(LOG_DEBUG, 2001 SPP_FMT "Up event", SPP_ARGS(ifp)); 2002 ifp->if_flags |= IFF_RUNNING; 2003 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2004 if (debug) 2005 addlog("(incoming call)\n"); 2006 sp->pp_flags |= PP_CALLIN; 2007 lcp.Open(sp); 2008 } else if (debug) 2009 addlog("\n"); 2010 } 2011 2012 sppp_up_event(&lcp, sp); 2013 } 2014 2015 static void 2016 sppp_lcp_down(struct sppp *sp) 2017 { 2018 STDDCL; 2019 2020 sppp_down_event(&lcp, sp); 2021 2022 /* 2023 * If this is neither a dial-on-demand nor a passive 2024 * interface, simulate an ``ifconfig down'' action, so the 2025 * administrator can force a redial by another ``ifconfig 2026 * up''. XXX For leased line operation, should we immediately 2027 * try to reopen the connection here? 2028 */ 2029 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2030 log(LOG_INFO, 2031 SPP_FMT "Down event (carrier loss), taking interface down.\n", 2032 SPP_ARGS(ifp)); 2033 if_down(ifp); 2034 } else { 2035 if (debug) 2036 log(LOG_DEBUG, 2037 SPP_FMT "Down event (carrier loss)\n", 2038 SPP_ARGS(ifp)); 2039 } 2040 sp->pp_flags &= ~PP_CALLIN; 2041 if (sp->state[IDX_LCP] != STATE_INITIAL) 2042 lcp.Close(sp); 2043 ifp->if_flags &= ~IFF_RUNNING; 2044 } 2045 2046 static void 2047 sppp_lcp_open(struct sppp *sp) 2048 { 2049 /* 2050 * If we are authenticator, negotiate LCP_AUTH 2051 */ 2052 if (sp->hisauth.proto != 0) 2053 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2054 else 2055 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2056 sp->pp_flags &= ~PP_NEEDAUTH; 2057 sppp_open_event(&lcp, sp); 2058 } 2059 2060 static void 2061 sppp_lcp_close(struct sppp *sp) 2062 { 2063 sppp_close_event(&lcp, sp); 2064 } 2065 2066 static void 2067 sppp_lcp_TO(void *cookie) 2068 { 2069 sppp_to_event(&lcp, (struct sppp *)cookie); 2070 } 2071 2072 /* 2073 * Analyze a configure request. Return true if it was agreeable, and 2074 * caused action sca, false if it has been rejected or nak'ed, and 2075 * caused action scn. (The return value is used to make the state 2076 * transition decision in the state automaton.) 2077 */ 2078 static int 2079 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2080 { 2081 STDDCL; 2082 u_char *buf, *r, *p; 2083 int origlen, rlen; 2084 u_int32_t nmagic; 2085 u_short authproto; 2086 2087 len -= 4; 2088 origlen = len; 2089 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2090 if (! buf) 2091 return (0); 2092 2093 if (debug) 2094 log(LOG_DEBUG, SPP_FMT "lcp parse opts:", 2095 SPP_ARGS(ifp)); 2096 2097 /* pass 1: check for things that need to be rejected */ 2098 p = (void*) (h+1); 2099 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2100 if (debug) 2101 addlog(" %s", sppp_lcp_opt_name(*p)); 2102 switch (*p) { 2103 case LCP_OPT_MAGIC: 2104 /* Magic number. */ 2105 /* fall through, both are same length */ 2106 case LCP_OPT_ASYNC_MAP: 2107 /* Async control character map. */ 2108 if (len >= 6 || p[1] == 6) 2109 continue; 2110 if (debug) 2111 addlog(" [invalid]"); 2112 break; 2113 case LCP_OPT_MRU: 2114 /* Maximum receive unit. */ 2115 if (len >= 4 && p[1] == 4) 2116 continue; 2117 if (debug) 2118 addlog(" [invalid]"); 2119 break; 2120 case LCP_OPT_AUTH_PROTO: 2121 if (len < 4) { 2122 if (debug) 2123 addlog(" [invalid]"); 2124 break; 2125 } 2126 authproto = (p[2] << 8) + p[3]; 2127 if (authproto == PPP_CHAP && p[1] != 5) { 2128 if (debug) 2129 addlog(" [invalid chap len]"); 2130 break; 2131 } 2132 if (sp->myauth.proto == 0) { 2133 /* we are not configured to do auth */ 2134 if (debug) 2135 addlog(" [not configured]"); 2136 break; 2137 } 2138 /* 2139 * Remote want us to authenticate, remember this, 2140 * so we stay in PHASE_AUTHENTICATE after LCP got 2141 * up. 2142 */ 2143 sp->pp_flags |= PP_NEEDAUTH; 2144 continue; 2145 default: 2146 /* Others not supported. */ 2147 if (debug) 2148 addlog(" [rej]"); 2149 break; 2150 } 2151 /* Add the option to rejected list. */ 2152 bcopy (p, r, p[1]); 2153 r += p[1]; 2154 rlen += p[1]; 2155 } 2156 if (rlen) { 2157 if (debug) 2158 addlog(" send conf-rej\n"); 2159 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2160 goto end; 2161 } else if (debug) 2162 addlog("\n"); 2163 2164 /* 2165 * pass 2: check for option values that are unacceptable and 2166 * thus require to be nak'ed. 2167 */ 2168 if (debug) 2169 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ", 2170 SPP_ARGS(ifp)); 2171 2172 p = (void*) (h+1); 2173 len = origlen; 2174 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2175 if (debug) 2176 addlog(" %s", sppp_lcp_opt_name(*p)); 2177 switch (*p) { 2178 case LCP_OPT_MAGIC: 2179 /* Magic number -- extract. */ 2180 nmagic = (u_int32_t)p[2] << 24 | 2181 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2182 if (nmagic != sp->lcp.magic) { 2183 if (debug) 2184 addlog(" 0x%x", nmagic); 2185 continue; 2186 } 2187 /* 2188 * Local and remote magics equal -- loopback? 2189 */ 2190 if (sp->pp_loopcnt >= MAXALIVECNT*5) { 2191 printf (SPP_FMT "loopback\n", 2192 SPP_ARGS(ifp)); 2193 sp->pp_loopcnt = 0; 2194 if (ifp->if_flags & IFF_UP) { 2195 if_down(ifp); 2196 IF_PURGE(&sp->pp_cpq); 2197 /* XXX ? */ 2198 lcp.Down(sp); 2199 lcp.Up(sp); 2200 } 2201 } else if (debug) 2202 addlog(" [glitch]"); 2203 ++sp->pp_loopcnt; 2204 /* 2205 * We negate our magic here, and NAK it. If 2206 * we see it later in an NAK packet, we 2207 * suggest a new one. 2208 */ 2209 nmagic = ~sp->lcp.magic; 2210 /* Gonna NAK it. */ 2211 p[2] = nmagic >> 24; 2212 p[3] = nmagic >> 16; 2213 p[4] = nmagic >> 8; 2214 p[5] = nmagic; 2215 break; 2216 2217 case LCP_OPT_ASYNC_MAP: 2218 /* Async control character map -- check to be zero. */ 2219 if (! p[2] && ! p[3] && ! p[4] && ! p[5]) { 2220 if (debug) 2221 addlog(" [empty]"); 2222 continue; 2223 } 2224 if (debug) 2225 addlog(" [non-empty]"); 2226 /* suggest a zero one */ 2227 p[2] = p[3] = p[4] = p[5] = 0; 2228 break; 2229 2230 case LCP_OPT_MRU: 2231 /* 2232 * Maximum receive unit. Always agreeable, 2233 * but ignored by now. 2234 */ 2235 sp->lcp.their_mru = p[2] * 256 + p[3]; 2236 if (debug) 2237 addlog(" %ld", sp->lcp.their_mru); 2238 continue; 2239 2240 case LCP_OPT_AUTH_PROTO: 2241 authproto = (p[2] << 8) + p[3]; 2242 if (sp->myauth.proto != authproto) { 2243 /* not agreed, nak */ 2244 if (debug) 2245 addlog(" [mine %s != his %s]", 2246 sppp_proto_name(sp->hisauth.proto), 2247 sppp_proto_name(authproto)); 2248 p[2] = sp->myauth.proto >> 8; 2249 p[3] = sp->myauth.proto; 2250 break; 2251 } 2252 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2253 if (debug) 2254 addlog(" [chap not MD5]"); 2255 p[4] = CHAP_MD5; 2256 break; 2257 } 2258 continue; 2259 } 2260 /* Add the option to nak'ed list. */ 2261 bcopy (p, r, p[1]); 2262 r += p[1]; 2263 rlen += p[1]; 2264 } 2265 if (rlen) { 2266 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2267 if (debug) 2268 addlog(" max_failure (%d) exceeded, " 2269 "send conf-rej\n", 2270 sp->lcp.max_failure); 2271 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2272 } else { 2273 if (debug) 2274 addlog(" send conf-nak\n"); 2275 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2276 } 2277 goto end; 2278 } else { 2279 if (debug) 2280 addlog(" send conf-ack\n"); 2281 sp->fail_counter[IDX_LCP] = 0; 2282 sp->pp_loopcnt = 0; 2283 sppp_cp_send (sp, PPP_LCP, CONF_ACK, 2284 h->ident, origlen, h+1); 2285 } 2286 2287 end: 2288 free (buf, M_TEMP); 2289 return (rlen == 0); 2290 } 2291 2292 /* 2293 * Analyze the LCP Configure-Reject option list, and adjust our 2294 * negotiation. 2295 */ 2296 static void 2297 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2298 { 2299 STDDCL; 2300 u_char *buf, *p; 2301 2302 len -= 4; 2303 buf = malloc (len, M_TEMP, M_NOWAIT); 2304 if (!buf) 2305 return; 2306 2307 if (debug) 2308 log(LOG_DEBUG, SPP_FMT "lcp rej opts:", 2309 SPP_ARGS(ifp)); 2310 2311 p = (void*) (h+1); 2312 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2313 if (debug) 2314 addlog(" %s", sppp_lcp_opt_name(*p)); 2315 switch (*p) { 2316 case LCP_OPT_MAGIC: 2317 /* Magic number -- can't use it, use 0 */ 2318 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2319 sp->lcp.magic = 0; 2320 break; 2321 case LCP_OPT_MRU: 2322 /* 2323 * Should not be rejected anyway, since we only 2324 * negotiate a MRU if explicitly requested by 2325 * peer. 2326 */ 2327 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2328 break; 2329 case LCP_OPT_AUTH_PROTO: 2330 /* 2331 * Peer doesn't want to authenticate himself, 2332 * deny unless this is a dialout call, and 2333 * AUTHFLAG_NOCALLOUT is set. 2334 */ 2335 if ((sp->pp_flags & PP_CALLIN) == 0 && 2336 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) { 2337 if (debug) 2338 addlog(" [don't insist on auth " 2339 "for callout]"); 2340 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2341 break; 2342 } 2343 if (debug) 2344 addlog("[access denied]\n"); 2345 lcp.Close(sp); 2346 break; 2347 } 2348 } 2349 if (debug) 2350 addlog("\n"); 2351 free (buf, M_TEMP); 2352 return; 2353 } 2354 2355 /* 2356 * Analyze the LCP Configure-NAK option list, and adjust our 2357 * negotiation. 2358 */ 2359 static void 2360 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2361 { 2362 STDDCL; 2363 u_char *buf, *p; 2364 u_int32_t magic; 2365 2366 len -= 4; 2367 buf = malloc (len, M_TEMP, M_NOWAIT); 2368 if (!buf) 2369 return; 2370 2371 if (debug) 2372 log(LOG_DEBUG, SPP_FMT "lcp nak opts:", 2373 SPP_ARGS(ifp)); 2374 2375 p = (void*) (h+1); 2376 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2377 if (debug) 2378 addlog(" %s", sppp_lcp_opt_name(*p)); 2379 switch (*p) { 2380 case LCP_OPT_MAGIC: 2381 /* Magic number -- renegotiate */ 2382 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2383 len >= 6 && p[1] == 6) { 2384 magic = (u_int32_t)p[2] << 24 | 2385 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2386 /* 2387 * If the remote magic is our negated one, 2388 * this looks like a loopback problem. 2389 * Suggest a new magic to make sure. 2390 */ 2391 if (magic == ~sp->lcp.magic) { 2392 if (debug) 2393 addlog(" magic glitch"); 2394 sp->lcp.magic = random(); 2395 } else { 2396 sp->lcp.magic = magic; 2397 if (debug) 2398 addlog(" %d", magic); 2399 } 2400 } 2401 break; 2402 case LCP_OPT_MRU: 2403 /* 2404 * Peer wants to advise us to negotiate an MRU. 2405 * Agree on it if it's reasonable, or use 2406 * default otherwise. 2407 */ 2408 if (len >= 4 && p[1] == 4) { 2409 u_int mru = p[2] * 256 + p[3]; 2410 if (debug) 2411 addlog(" %d", mru); 2412 if (mru < PP_MTU || mru > PP_MAX_MRU) 2413 mru = PP_MTU; 2414 sp->lcp.mru = mru; 2415 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2416 } 2417 break; 2418 case LCP_OPT_AUTH_PROTO: 2419 /* 2420 * Peer doesn't like our authentication method, 2421 * deny. 2422 */ 2423 if (debug) 2424 addlog("[access denied]\n"); 2425 lcp.Close(sp); 2426 break; 2427 } 2428 } 2429 if (debug) 2430 addlog("\n"); 2431 free (buf, M_TEMP); 2432 return; 2433 } 2434 2435 static void 2436 sppp_lcp_tlu(struct sppp *sp) 2437 { 2438 STDDCL; 2439 int i; 2440 u_int32_t mask; 2441 2442 /* XXX ? */ 2443 if (! (ifp->if_flags & IFF_UP) && 2444 (ifp->if_flags & IFF_RUNNING)) { 2445 /* Coming out of loopback mode. */ 2446 if_up(ifp); 2447 printf (SPP_FMT "up\n", SPP_ARGS(ifp)); 2448 } 2449 2450 for (i = 0; i < IDX_COUNT; i++) 2451 if ((cps[i])->flags & CP_QUAL) 2452 (cps[i])->Open(sp); 2453 2454 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2455 (sp->pp_flags & PP_NEEDAUTH) != 0) 2456 sp->pp_phase = PHASE_AUTHENTICATE; 2457 else 2458 sp->pp_phase = PHASE_NETWORK; 2459 2460 if(debug) 2461 { 2462 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2463 sppp_phase_name(sp->pp_phase)); 2464 } 2465 2466 /* 2467 * Open all authentication protocols. This is even required 2468 * if we already proceeded to network phase, since it might be 2469 * that remote wants us to authenticate, so we might have to 2470 * send a PAP request. Undesired authentication protocols 2471 * don't do anything when they get an Open event. 2472 */ 2473 for (i = 0; i < IDX_COUNT; i++) 2474 if ((cps[i])->flags & CP_AUTH) 2475 (cps[i])->Open(sp); 2476 2477 if (sp->pp_phase == PHASE_NETWORK) { 2478 /* Notify all NCPs. */ 2479 for (i = 0; i < IDX_COUNT; i++) 2480 if ((cps[i])->flags & CP_NCP) 2481 (cps[i])->Open(sp); 2482 } 2483 2484 /* Send Up events to all started protos. */ 2485 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2486 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2487 (cps[i])->Up(sp); 2488 2489 /* notify low-level driver of state change */ 2490 if (sp->pp_chg) 2491 sp->pp_chg(sp, (int)sp->pp_phase); 2492 2493 if (sp->pp_phase == PHASE_NETWORK) 2494 /* if no NCP is starting, close down */ 2495 sppp_lcp_check_and_close(sp); 2496 } 2497 2498 static void 2499 sppp_lcp_tld(struct sppp *sp) 2500 { 2501 STDDCL; 2502 int i; 2503 u_int32_t mask; 2504 2505 sp->pp_phase = PHASE_TERMINATE; 2506 2507 if(debug) 2508 { 2509 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2510 sppp_phase_name(sp->pp_phase)); 2511 } 2512 2513 /* 2514 * Take upper layers down. We send the Down event first and 2515 * the Close second to prevent the upper layers from sending 2516 * ``a flurry of terminate-request packets'', as the RFC 2517 * describes it. 2518 */ 2519 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2520 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2521 (cps[i])->Down(sp); 2522 (cps[i])->Close(sp); 2523 } 2524 } 2525 2526 static void 2527 sppp_lcp_tls(struct sppp *sp) 2528 { 2529 STDDCL; 2530 2531 sp->pp_phase = PHASE_ESTABLISH; 2532 2533 if(debug) 2534 { 2535 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2536 sppp_phase_name(sp->pp_phase)); 2537 } 2538 2539 /* Notify lower layer if desired. */ 2540 if (sp->pp_tls) 2541 (sp->pp_tls)(sp); 2542 } 2543 2544 static void 2545 sppp_lcp_tlf(struct sppp *sp) 2546 { 2547 STDDCL; 2548 2549 sp->pp_phase = PHASE_DEAD; 2550 2551 if(debug) 2552 { 2553 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2554 sppp_phase_name(sp->pp_phase)); 2555 } 2556 2557 /* Notify lower layer if desired. */ 2558 if (sp->pp_tlf) 2559 (sp->pp_tlf)(sp); 2560 } 2561 2562 static void 2563 sppp_lcp_scr(struct sppp *sp) 2564 { 2565 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2566 int i = 0; 2567 u_short authproto; 2568 2569 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2570 if (! sp->lcp.magic) 2571 sp->lcp.magic = random(); 2572 opt[i++] = LCP_OPT_MAGIC; 2573 opt[i++] = 6; 2574 opt[i++] = sp->lcp.magic >> 24; 2575 opt[i++] = sp->lcp.magic >> 16; 2576 opt[i++] = sp->lcp.magic >> 8; 2577 opt[i++] = sp->lcp.magic; 2578 } 2579 2580 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2581 opt[i++] = LCP_OPT_MRU; 2582 opt[i++] = 4; 2583 opt[i++] = sp->lcp.mru >> 8; 2584 opt[i++] = sp->lcp.mru; 2585 } 2586 2587 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2588 authproto = sp->hisauth.proto; 2589 opt[i++] = LCP_OPT_AUTH_PROTO; 2590 opt[i++] = authproto == PPP_CHAP? 5: 4; 2591 opt[i++] = authproto >> 8; 2592 opt[i++] = authproto; 2593 if (authproto == PPP_CHAP) 2594 opt[i++] = CHAP_MD5; 2595 } 2596 2597 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2598 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2599 } 2600 2601 /* 2602 * Check the open NCPs, return true if at least one NCP is open. 2603 */ 2604 static int 2605 sppp_ncp_check(struct sppp *sp) 2606 { 2607 int i, mask; 2608 2609 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2610 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2611 return 1; 2612 return 0; 2613 } 2614 2615 /* 2616 * Re-check the open NCPs and see if we should terminate the link. 2617 * Called by the NCPs during their tlf action handling. 2618 */ 2619 static void 2620 sppp_lcp_check_and_close(struct sppp *sp) 2621 { 2622 2623 if (sp->pp_phase < PHASE_NETWORK) 2624 /* don't bother, we are already going down */ 2625 return; 2626 2627 if (sppp_ncp_check(sp)) 2628 return; 2629 2630 lcp.Close(sp); 2631 } 2632 2633 2634 /* 2636 *--------------------------------------------------------------------------* 2637 * * 2638 * The IPCP implementation. * 2639 * * 2640 *--------------------------------------------------------------------------* 2641 */ 2642 2643 static void 2644 sppp_ipcp_init(struct sppp *sp) 2645 { 2646 sp->ipcp.opts = 0; 2647 sp->ipcp.flags = 0; 2648 sp->state[IDX_IPCP] = STATE_INITIAL; 2649 sp->fail_counter[IDX_IPCP] = 0; 2650 sp->pp_seq[IDX_IPCP] = 0; 2651 sp->pp_rseq[IDX_IPCP] = 0; 2652 callout_init(&sp->ch[IDX_IPCP]); 2653 } 2654 2655 static void 2656 sppp_ipcp_up(struct sppp *sp) 2657 { 2658 sppp_up_event(&ipcp, sp); 2659 } 2660 2661 static void 2662 sppp_ipcp_down(struct sppp *sp) 2663 { 2664 sppp_down_event(&ipcp, sp); 2665 } 2666 2667 static void 2668 sppp_ipcp_open(struct sppp *sp) 2669 { 2670 STDDCL; 2671 u_int32_t myaddr, hisaddr; 2672 2673 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN); 2674 2675 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2676 /* 2677 * If we don't have his address, this probably means our 2678 * interface doesn't want to talk IP at all. (This could 2679 * be the case if somebody wants to speak only IPX, for 2680 * example.) Don't open IPCP in this case. 2681 */ 2682 if (hisaddr == 0L) { 2683 /* XXX this message should go away */ 2684 if (debug) 2685 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n", 2686 SPP_ARGS(ifp)); 2687 return; 2688 } 2689 2690 if (myaddr == 0L) { 2691 /* 2692 * I don't have an assigned address, so i need to 2693 * negotiate my address. 2694 */ 2695 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2696 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2697 } else 2698 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 2699 sppp_open_event(&ipcp, sp); 2700 } 2701 2702 static void 2703 sppp_ipcp_close(struct sppp *sp) 2704 { 2705 sppp_close_event(&ipcp, sp); 2706 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 2707 /* 2708 * My address was dynamic, clear it again. 2709 */ 2710 sppp_set_ip_addr(sp, 0L); 2711 } 2712 2713 static void 2714 sppp_ipcp_TO(void *cookie) 2715 { 2716 sppp_to_event(&ipcp, (struct sppp *)cookie); 2717 } 2718 2719 /* 2720 * Analyze a configure request. Return true if it was agreeable, and 2721 * caused action sca, false if it has been rejected or nak'ed, and 2722 * caused action scn. (The return value is used to make the state 2723 * transition decision in the state automaton.) 2724 */ 2725 static int 2726 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2727 { 2728 u_char *buf, *r, *p; 2729 struct ifnet *ifp = &sp->pp_if; 2730 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2731 u_int32_t hisaddr, desiredaddr; 2732 int gotmyaddr = 0; 2733 2734 len -= 4; 2735 origlen = len; 2736 /* 2737 * Make sure to allocate a buf that can at least hold a 2738 * conf-nak with an `address' option. We might need it below. 2739 */ 2740 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2741 if (! buf) 2742 return (0); 2743 2744 /* pass 1: see if we can recognize them */ 2745 if (debug) 2746 log(LOG_DEBUG, SPP_FMT "ipcp parse opts:", 2747 SPP_ARGS(ifp)); 2748 p = (void*) (h+1); 2749 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2750 if (debug) 2751 addlog(" %s", sppp_ipcp_opt_name(*p)); 2752 switch (*p) { 2753 #ifdef notyet 2754 case IPCP_OPT_COMPRESSION: 2755 if (len >= 6 && p[1] >= 6) { 2756 /* correctly formed compress option */ 2757 continue; 2758 } 2759 if (debug) 2760 addlog(" [invalid]"); 2761 break; 2762 #endif 2763 case IPCP_OPT_ADDRESS: 2764 if (len >= 6 && p[1] == 6) { 2765 /* correctly formed address option */ 2766 continue; 2767 } 2768 if (debug) 2769 addlog(" [invalid]"); 2770 break; 2771 default: 2772 /* Others not supported. */ 2773 if (debug) 2774 addlog(" [rej]"); 2775 break; 2776 } 2777 /* Add the option to rejected list. */ 2778 bcopy (p, r, p[1]); 2779 r += p[1]; 2780 rlen += p[1]; 2781 } 2782 if (rlen) { 2783 if (debug) 2784 addlog(" send conf-rej\n"); 2785 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2786 goto end; 2787 } else if (debug) 2788 addlog("\n"); 2789 2790 /* pass 2: parse option values */ 2791 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); 2792 if (debug) 2793 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ", 2794 SPP_ARGS(ifp)); 2795 p = (void*) (h+1); 2796 len = origlen; 2797 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2798 if (debug) 2799 addlog(" %s", sppp_ipcp_opt_name(*p)); 2800 switch (*p) { 2801 #ifdef notyet 2802 case IPCP_OPT_COMPRESSION: 2803 continue; 2804 #endif 2805 case IPCP_OPT_ADDRESS: 2806 desiredaddr = p[2] << 24 | p[3] << 16 | 2807 p[4] << 8 | p[5]; 2808 if (!(sp->ipcp.flags & IPCP_MYADDR_SEEN) && 2809 (sp->ipcp.flags & IPCP_MYADDR_DYN)) { 2810 /* 2811 * hopefully this is our address !! 2812 */ 2813 if (debug) 2814 addlog(" [wantmyaddr %s]", 2815 sppp_dotted_quad(desiredaddr)); 2816 /* 2817 * When doing dynamic address assignment, 2818 * we accept his offer. Otherwise, we 2819 * ignore it and thus continue to negotiate 2820 * our already existing value. 2821 */ 2822 sppp_set_ip_addr(sp, desiredaddr); 2823 if (debug) 2824 addlog(" [agree]"); 2825 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 2826 gotmyaddr++; 2827 continue; 2828 } else { 2829 if (desiredaddr == hisaddr || 2830 (hisaddr == 1 && desiredaddr != 0)) { 2831 /* 2832 * Peer's address is same as our value, 2833 * this is agreeable. Gonna conf-ack 2834 * it. 2835 */ 2836 if (debug) 2837 addlog(" %s [ack]", 2838 sppp_dotted_quad(hisaddr)); 2839 /* record that we've seen it already */ 2840 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2841 continue; 2842 } 2843 /* 2844 * The address wasn't agreeable. This is either 2845 * he sent us 0.0.0.0, asking to assign him an 2846 * address, or he send us another address not 2847 * matching our value. Either case, we gonna 2848 * conf-nak it with our value. 2849 */ 2850 if (debug) { 2851 if (desiredaddr == 0) 2852 addlog(" [addr requested]"); 2853 else 2854 addlog(" %s [not agreed]", 2855 sppp_dotted_quad(desiredaddr)); 2856 } 2857 2858 p[2] = hisaddr >> 24; 2859 p[3] = hisaddr >> 16; 2860 p[4] = hisaddr >> 8; 2861 p[5] = hisaddr; 2862 break; 2863 } 2864 } 2865 /* Add the option to nak'ed list. */ 2866 bcopy (p, r, p[1]); 2867 r += p[1]; 2868 rlen += p[1]; 2869 } 2870 2871 /* 2872 * If we are about to conf-ack the request, but haven't seen 2873 * his address so far, gonna conf-nak it instead, with the 2874 * `address' option present and our idea of his address being 2875 * filled in there, to request negotiation of both addresses. 2876 * 2877 * XXX This can result in an endless req - nak loop if peer 2878 * doesn't want to send us his address. Q: What should we do 2879 * about it? XXX A: implement the max-failure counter. 2880 */ 2881 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) { 2882 buf[0] = IPCP_OPT_ADDRESS; 2883 buf[1] = 6; 2884 buf[2] = hisaddr >> 24; 2885 buf[3] = hisaddr >> 16; 2886 buf[4] = hisaddr >> 8; 2887 buf[5] = hisaddr; 2888 rlen = 6; 2889 if (debug) 2890 addlog(" still need hisaddr"); 2891 } 2892 2893 if (rlen) { 2894 if (debug) 2895 addlog(" send conf-nak\n"); 2896 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2897 } else { 2898 if (debug) 2899 addlog(" send conf-ack\n"); 2900 sppp_cp_send (sp, PPP_IPCP, CONF_ACK, 2901 h->ident, origlen, h+1); 2902 } 2903 2904 end: 2905 free (buf, M_TEMP); 2906 return (rlen == 0); 2907 } 2908 2909 /* 2910 * Analyze the IPCP Configure-Reject option list, and adjust our 2911 * negotiation. 2912 */ 2913 static void 2914 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2915 { 2916 u_char *buf, *p; 2917 struct ifnet *ifp = &sp->pp_if; 2918 int debug = ifp->if_flags & IFF_DEBUG; 2919 2920 len -= 4; 2921 buf = malloc (len, M_TEMP, M_NOWAIT); 2922 if (!buf) 2923 return; 2924 2925 if (debug) 2926 log(LOG_DEBUG, SPP_FMT "ipcp rej opts:", 2927 SPP_ARGS(ifp)); 2928 2929 p = (void*) (h+1); 2930 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2931 if (debug) 2932 addlog(" %s", sppp_ipcp_opt_name(*p)); 2933 switch (*p) { 2934 case IPCP_OPT_ADDRESS: 2935 /* 2936 * Peer doesn't grok address option. This is 2937 * bad. XXX Should we better give up here? 2938 */ 2939 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 2940 break; 2941 #ifdef notyet 2942 case IPCP_OPT_COMPRESS: 2943 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 2944 break; 2945 #endif 2946 } 2947 } 2948 if (debug) 2949 addlog("\n"); 2950 free (buf, M_TEMP); 2951 return; 2952 } 2953 2954 /* 2955 * Analyze the IPCP Configure-NAK option list, and adjust our 2956 * negotiation. 2957 */ 2958 static void 2959 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2960 { 2961 u_char *buf, *p; 2962 struct ifnet *ifp = &sp->pp_if; 2963 int debug = ifp->if_flags & IFF_DEBUG; 2964 u_int32_t wantaddr; 2965 2966 len -= 4; 2967 buf = malloc (len, M_TEMP, M_NOWAIT); 2968 if (!buf) 2969 return; 2970 2971 if (debug) 2972 log(LOG_DEBUG, SPP_FMT "ipcp nak opts:", 2973 SPP_ARGS(ifp)); 2974 2975 p = (void*) (h+1); 2976 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2977 if (debug) 2978 addlog(" %s", sppp_ipcp_opt_name(*p)); 2979 switch (*p) { 2980 case IPCP_OPT_ADDRESS: 2981 /* 2982 * Peer doesn't like our local IP address. See 2983 * if we can do something for him. We'll drop 2984 * him our address then. 2985 */ 2986 if (len >= 6 && p[1] == 6) { 2987 wantaddr = p[2] << 24 | p[3] << 16 | 2988 p[4] << 8 | p[5]; 2989 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2990 if (debug) 2991 addlog(" [wantaddr %s]", 2992 sppp_dotted_quad(wantaddr)); 2993 /* 2994 * When doing dynamic address assignment, 2995 * we accept his offer. Otherwise, we 2996 * ignore it and thus continue to negotiate 2997 * our already existing value. 2998 */ 2999 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3000 sppp_set_ip_addr(sp, wantaddr); 3001 if (debug) 3002 addlog(" [agree]"); 3003 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3004 } 3005 } 3006 break; 3007 #ifdef notyet 3008 case IPCP_OPT_COMPRESS: 3009 /* 3010 * Peer wants different compression parameters. 3011 */ 3012 break; 3013 #endif 3014 } 3015 } 3016 if (debug) 3017 addlog("\n"); 3018 free (buf, M_TEMP); 3019 return; 3020 } 3021 3022 static void 3023 sppp_ipcp_tlu(struct sppp *sp) 3024 { 3025 /* we are up - notify isdn daemon */ 3026 if (sp->pp_con) 3027 sp->pp_con(sp); 3028 } 3029 3030 static void 3031 sppp_ipcp_tld(struct sppp *sp) 3032 { 3033 } 3034 3035 static void 3036 sppp_ipcp_tls(struct sppp *sp) 3037 { 3038 /* indicate to LCP that it must stay alive */ 3039 sp->lcp.protos |= (1 << IDX_IPCP); 3040 } 3041 3042 static void 3043 sppp_ipcp_tlf(struct sppp *sp) 3044 { 3045 /* we no longer need LCP */ 3046 sp->lcp.protos &= ~(1 << IDX_IPCP); 3047 } 3048 3049 static void 3050 sppp_ipcp_scr(struct sppp *sp) 3051 { 3052 char opt[6 /* compression */ + 6 /* address */]; 3053 u_int32_t ouraddr; 3054 int i = 0; 3055 3056 #ifdef notyet 3057 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3058 opt[i++] = IPCP_OPT_COMPRESSION; 3059 opt[i++] = 6; 3060 opt[i++] = 0; /* VJ header compression */ 3061 opt[i++] = 0x2d; /* VJ header compression */ 3062 opt[i++] = max_slot_id; 3063 opt[i++] = comp_slot_id; 3064 } 3065 #endif 3066 3067 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3068 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3069 opt[i++] = IPCP_OPT_ADDRESS; 3070 opt[i++] = 6; 3071 opt[i++] = ouraddr >> 24; 3072 opt[i++] = ouraddr >> 16; 3073 opt[i++] = ouraddr >> 8; 3074 opt[i++] = ouraddr; 3075 } 3076 3077 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3078 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3079 } 3080 3081 3082 /* 3084 *--------------------------------------------------------------------------* 3085 * * 3086 * The IPv6CP implementation. * 3087 * * 3088 *--------------------------------------------------------------------------* 3089 */ 3090 3091 #ifdef INET6 3092 static void 3093 sppp_ipv6cp_init(struct sppp *sp) 3094 { 3095 sp->ipv6cp.opts = 0; 3096 sp->ipv6cp.flags = 0; 3097 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3098 sp->fail_counter[IDX_IPV6CP] = 0; 3099 sp->pp_seq[IDX_IPV6CP] = 0; 3100 sp->pp_rseq[IDX_IPV6CP] = 0; 3101 callout_init(&sp->ch[IDX_IPV6CP]); 3102 } 3103 3104 static void 3105 sppp_ipv6cp_up(struct sppp *sp) 3106 { 3107 sppp_up_event(&ipv6cp, sp); 3108 } 3109 3110 static void 3111 sppp_ipv6cp_down(struct sppp *sp) 3112 { 3113 sppp_down_event(&ipv6cp, sp); 3114 } 3115 3116 static void 3117 sppp_ipv6cp_open(struct sppp *sp) 3118 { 3119 STDDCL; 3120 struct in6_addr myaddr, hisaddr; 3121 3122 #ifdef IPV6CP_MYIFID_DYN 3123 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3124 #else 3125 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3126 #endif 3127 3128 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3129 /* 3130 * If we don't have our address, this probably means our 3131 * interface doesn't want to talk IPv6 at all. (This could 3132 * be the case if somebody wants to speak only IPX, for 3133 * example.) Don't open IPv6CP in this case. 3134 */ 3135 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3136 /* XXX this message should go away */ 3137 if (debug) 3138 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n", 3139 SPP_ARGS(ifp)); 3140 return; 3141 } 3142 3143 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3144 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3145 sppp_open_event(&ipv6cp, sp); 3146 } 3147 3148 static void 3149 sppp_ipv6cp_close(struct sppp *sp) 3150 { 3151 sppp_close_event(&ipv6cp, sp); 3152 } 3153 3154 static void 3155 sppp_ipv6cp_TO(void *cookie) 3156 { 3157 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3158 } 3159 3160 /* 3161 * Analyze a configure request. Return true if it was agreeable, and 3162 * caused action sca, false if it has been rejected or nak'ed, and 3163 * caused action scn. (The return value is used to make the state 3164 * transition decision in the state automaton.) 3165 */ 3166 static int 3167 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3168 { 3169 u_char *buf, *r, *p; 3170 struct ifnet *ifp = &sp->pp_if; 3171 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3172 struct in6_addr myaddr, desiredaddr, suggestaddr; 3173 int ifidcount; 3174 int type; 3175 int collision, nohisaddr; 3176 3177 len -= 4; 3178 origlen = len; 3179 /* 3180 * Make sure to allocate a buf that can at least hold a 3181 * conf-nak with an `address' option. We might need it below. 3182 */ 3183 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3184 if (! buf) 3185 return (0); 3186 3187 /* pass 1: see if we can recognize them */ 3188 if (debug) 3189 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:", 3190 SPP_ARGS(ifp)); 3191 p = (void*) (h+1); 3192 ifidcount = 0; 3193 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3194 if (debug) 3195 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3196 switch (*p) { 3197 case IPV6CP_OPT_IFID: 3198 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3199 /* correctly formed address option */ 3200 ifidcount++; 3201 continue; 3202 } 3203 if (debug) 3204 addlog(" [invalid]"); 3205 break; 3206 #ifdef notyet 3207 case IPV6CP_OPT_COMPRESSION: 3208 if (len >= 4 && p[1] >= 4) { 3209 /* correctly formed compress option */ 3210 continue; 3211 } 3212 if (debug) 3213 addlog(" [invalid]"); 3214 break; 3215 #endif 3216 default: 3217 /* Others not supported. */ 3218 if (debug) 3219 addlog(" [rej]"); 3220 break; 3221 } 3222 /* Add the option to rejected list. */ 3223 bcopy (p, r, p[1]); 3224 r += p[1]; 3225 rlen += p[1]; 3226 } 3227 if (rlen) { 3228 if (debug) 3229 addlog(" send conf-rej\n"); 3230 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3231 goto end; 3232 } else if (debug) 3233 addlog("\n"); 3234 3235 /* pass 2: parse option values */ 3236 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3237 if (debug) 3238 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ", 3239 SPP_ARGS(ifp)); 3240 p = (void*) (h+1); 3241 len = origlen; 3242 type = CONF_ACK; 3243 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3244 if (debug) 3245 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3246 switch (*p) { 3247 #ifdef notyet 3248 case IPV6CP_OPT_COMPRESSION: 3249 continue; 3250 #endif 3251 case IPV6CP_OPT_IFID: 3252 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3253 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3254 collision = (bcmp(&desiredaddr.s6_addr[8], 3255 &myaddr.s6_addr[8], 8) == 0); 3256 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3257 3258 desiredaddr.s6_addr16[0] = htons(0xfe80); 3259 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3260 3261 if (!collision && !nohisaddr) { 3262 /* no collision, hisaddr known - Conf-Ack */ 3263 type = CONF_ACK; 3264 3265 if (debug) { 3266 addlog(" %s [%s]", 3267 ip6_sprintf(&desiredaddr), 3268 sppp_cp_type_name(type)); 3269 } 3270 continue; 3271 } 3272 3273 memset(&suggestaddr, 0, sizeof(&suggestaddr)); 3274 if (collision && nohisaddr) { 3275 /* collision, hisaddr unknown - Conf-Rej */ 3276 type = CONF_REJ; 3277 memset(&p[2], 0, 8); 3278 } else { 3279 /* 3280 * - no collision, hisaddr unknown, or 3281 * - collision, hisaddr known 3282 * Conf-Nak, suggest hisaddr 3283 */ 3284 type = CONF_NAK; 3285 sppp_suggest_ip6_addr(sp, &suggestaddr); 3286 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3287 } 3288 if (debug) 3289 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3290 sppp_cp_type_name(type)); 3291 break; 3292 } 3293 /* Add the option to nak'ed list. */ 3294 bcopy (p, r, p[1]); 3295 r += p[1]; 3296 rlen += p[1]; 3297 } 3298 3299 if (rlen == 0 && type == CONF_ACK) { 3300 if (debug) 3301 addlog(" send %s\n", sppp_cp_type_name(type)); 3302 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1); 3303 } else { 3304 #ifdef DIAGNOSTIC 3305 if (type == CONF_ACK) 3306 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3307 #endif 3308 3309 if (debug) { 3310 addlog(" send %s suggest %s\n", 3311 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3312 } 3313 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3314 } 3315 3316 end: 3317 free (buf, M_TEMP); 3318 return (rlen == 0); 3319 } 3320 3321 /* 3322 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3323 * negotiation. 3324 */ 3325 static void 3326 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3327 { 3328 u_char *buf, *p; 3329 struct ifnet *ifp = &sp->pp_if; 3330 int debug = ifp->if_flags & IFF_DEBUG; 3331 3332 len -= 4; 3333 buf = malloc (len, M_TEMP, M_NOWAIT); 3334 if (!buf) 3335 return; 3336 3337 if (debug) 3338 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:", 3339 SPP_ARGS(ifp)); 3340 3341 p = (void*) (h+1); 3342 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3343 if (debug) 3344 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3345 switch (*p) { 3346 case IPV6CP_OPT_IFID: 3347 /* 3348 * Peer doesn't grok address option. This is 3349 * bad. XXX Should we better give up here? 3350 */ 3351 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3352 break; 3353 #ifdef notyet 3354 case IPV6CP_OPT_COMPRESS: 3355 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3356 break; 3357 #endif 3358 } 3359 } 3360 if (debug) 3361 addlog("\n"); 3362 free (buf, M_TEMP); 3363 return; 3364 } 3365 3366 /* 3367 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3368 * negotiation. 3369 */ 3370 static void 3371 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3372 { 3373 u_char *buf, *p; 3374 struct ifnet *ifp = &sp->pp_if; 3375 int debug = ifp->if_flags & IFF_DEBUG; 3376 struct in6_addr suggestaddr; 3377 3378 len -= 4; 3379 buf = malloc (len, M_TEMP, M_NOWAIT); 3380 if (!buf) 3381 return; 3382 3383 if (debug) 3384 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:", 3385 SPP_ARGS(ifp)); 3386 3387 p = (void*) (h+1); 3388 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3389 if (debug) 3390 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3391 switch (*p) { 3392 case IPV6CP_OPT_IFID: 3393 /* 3394 * Peer doesn't like our local ifid. See 3395 * if we can do something for him. We'll drop 3396 * him our address then. 3397 */ 3398 if (len < 10 || p[1] != 10) 3399 break; 3400 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3401 suggestaddr.s6_addr16[0] = htons(0xfe80); 3402 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3403 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3404 3405 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3406 if (debug) 3407 addlog(" [suggestaddr %s]", 3408 ip6_sprintf(&suggestaddr)); 3409 #ifdef IPV6CP_MYIFID_DYN 3410 /* 3411 * When doing dynamic address assignment, 3412 * we accept his offer. 3413 */ 3414 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3415 struct in6_addr lastsuggest; 3416 /* 3417 * If <suggested myaddr from peer> equals to 3418 * <hisaddr we have suggested last time>, 3419 * we have a collision. generate new random 3420 * ifid. 3421 */ 3422 sppp_suggest_ip6_addr(&lastsuggest); 3423 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3424 lastsuggest)) { 3425 if (debug) 3426 addlog(" [random]"); 3427 sppp_gen_ip6_addr(sp, &suggestaddr); 3428 } 3429 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3430 if (debug) 3431 addlog(" [agree]"); 3432 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3433 } 3434 #else 3435 /* 3436 * Since we do not do dynamic address assignment, 3437 * we ignore it and thus continue to negotiate 3438 * our already existing value. This can possibly 3439 * go into infinite request-reject loop. 3440 * 3441 * This is not likely because we normally use 3442 * ifid based on MAC-address. 3443 * If you have no ethernet card on the node, too bad. 3444 * XXX should we use fail_counter? 3445 */ 3446 #endif 3447 break; 3448 #ifdef notyet 3449 case IPV6CP_OPT_COMPRESS: 3450 /* 3451 * Peer wants different compression parameters. 3452 */ 3453 break; 3454 #endif 3455 } 3456 } 3457 if (debug) 3458 addlog("\n"); 3459 free (buf, M_TEMP); 3460 return; 3461 } 3462 3463 static void 3464 sppp_ipv6cp_tlu(struct sppp *sp) 3465 { 3466 /* we are up - notify isdn daemon */ 3467 if (sp->pp_con) 3468 sp->pp_con(sp); 3469 } 3470 3471 static void 3472 sppp_ipv6cp_tld(struct sppp *sp) 3473 { 3474 } 3475 3476 static void 3477 sppp_ipv6cp_tls(struct sppp *sp) 3478 { 3479 /* indicate to LCP that it must stay alive */ 3480 sp->lcp.protos |= (1 << IDX_IPV6CP); 3481 } 3482 3483 static void 3484 sppp_ipv6cp_tlf(struct sppp *sp) 3485 { 3486 /* we no longer need LCP */ 3487 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3488 } 3489 3490 static void 3491 sppp_ipv6cp_scr(struct sppp *sp) 3492 { 3493 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3494 struct in6_addr ouraddr; 3495 int i = 0; 3496 3497 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3498 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3499 opt[i++] = IPV6CP_OPT_IFID; 3500 opt[i++] = 10; 3501 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3502 i += 8; 3503 } 3504 3505 #ifdef notyet 3506 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3507 opt[i++] = IPV6CP_OPT_COMPRESSION; 3508 opt[i++] = 4; 3509 opt[i++] = 0; /* TBD */ 3510 opt[i++] = 0; /* TBD */ 3511 /* variable length data may follow */ 3512 } 3513 #endif 3514 3515 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3516 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3517 } 3518 #else /*INET6*/ 3519 static void sppp_ipv6cp_init(struct sppp *sp) 3520 { 3521 } 3522 3523 static void sppp_ipv6cp_up(struct sppp *sp) 3524 { 3525 } 3526 3527 static void sppp_ipv6cp_down(struct sppp *sp) 3528 { 3529 } 3530 3531 3532 static void sppp_ipv6cp_open(struct sppp *sp) 3533 { 3534 } 3535 3536 static void sppp_ipv6cp_close(struct sppp *sp) 3537 { 3538 } 3539 3540 static void sppp_ipv6cp_TO(void *sp) 3541 { 3542 } 3543 3544 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3545 { 3546 return 0; 3547 } 3548 3549 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3550 { 3551 } 3552 3553 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3554 { 3555 } 3556 3557 static void sppp_ipv6cp_tlu(struct sppp *sp) 3558 { 3559 } 3560 3561 static void sppp_ipv6cp_tld(struct sppp *sp) 3562 { 3563 } 3564 3565 static void sppp_ipv6cp_tls(struct sppp *sp) 3566 { 3567 } 3568 3569 static void sppp_ipv6cp_tlf(struct sppp *sp) 3570 { 3571 } 3572 3573 static void sppp_ipv6cp_scr(struct sppp *sp) 3574 { 3575 } 3576 #endif /*INET6*/ 3577 3578 3579 /* 3581 *--------------------------------------------------------------------------* 3582 * * 3583 * The CHAP implementation. * 3584 * * 3585 *--------------------------------------------------------------------------* 3586 */ 3587 3588 /* 3589 * The authentication protocols don't employ a full-fledged state machine as 3590 * the control protocols do, since they do have Open and Close events, but 3591 * not Up and Down, nor are they explicitly terminated. Also, use of the 3592 * authentication protocols may be different in both directions (this makes 3593 * sense, think of a machine that never accepts incoming calls but only 3594 * calls out, it doesn't require the called party to authenticate itself). 3595 * 3596 * Our state machine for the local authentication protocol (we are requesting 3597 * the peer to authenticate) looks like: 3598 * 3599 * RCA- 3600 * +--------------------------------------------+ 3601 * V scn,tld| 3602 * +--------+ Close +---------+ RCA+ 3603 * | |<----------------------------------| |------+ 3604 * +--->| Closed | TO* | Opened | sca | 3605 * | | |-----+ +-------| |<-----+ 3606 * | +--------+ irc | | +---------+ 3607 * | ^ | | ^ 3608 * | | | | | 3609 * | | | | | 3610 * | TO-| | | | 3611 * | |tld TO+ V | | 3612 * | | +------->+ | | 3613 * | | | | | | 3614 * | +--------+ V | | 3615 * | | |<----+<--------------------+ | 3616 * | | Req- | scr | 3617 * | | Sent | | 3618 * | | | | 3619 * | +--------+ | 3620 * | RCA- | | RCA+ | 3621 * +------+ +------------------------------------------+ 3622 * scn,tld sca,irc,ict,tlu 3623 * 3624 * 3625 * with: 3626 * 3627 * Open: LCP reached authentication phase 3628 * Close: LCP reached terminate phase 3629 * 3630 * RCA+: received reply (pap-req, chap-response), acceptable 3631 * RCN: received reply (pap-req, chap-response), not acceptable 3632 * TO+: timeout with restart counter >= 0 3633 * TO-: timeout with restart counter < 0 3634 * TO*: reschedule timeout for CHAP 3635 * 3636 * scr: send request packet (none for PAP, chap-challenge) 3637 * sca: send ack packet (pap-ack, chap-success) 3638 * scn: send nak packet (pap-nak, chap-failure) 3639 * ict: initialize re-challenge timer (CHAP only) 3640 * 3641 * tlu: this-layer-up, LCP reaches network phase 3642 * tld: this-layer-down, LCP enters terminate phase 3643 * 3644 * Note that in CHAP mode, after sending a new challenge, while the state 3645 * automaton falls back into Req-Sent state, it doesn't signal a tld 3646 * event to LCP, so LCP remains in network phase. Only after not getting 3647 * any response (or after getting an unacceptable response), CHAP closes, 3648 * causing LCP to enter terminate phase. 3649 * 3650 * With PAP, there is no initial request that can be sent. The peer is 3651 * expected to send one based on the successful negotiation of PAP as 3652 * the authentication protocol during the LCP option negotiation. 3653 * 3654 * Incoming authentication protocol requests (remote requests 3655 * authentication, we are peer) don't employ a state machine at all, 3656 * they are simply answered. Some peers [Ascend P50 firmware rev 3657 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3658 * still in authentication phase (thereby violating the standard that 3659 * demands that these NCP packets are to be discarded), so we keep 3660 * track of the peer demanding us to authenticate, and only proceed to 3661 * phase network once we've seen a positive acknowledge for the 3662 * authentication. 3663 */ 3664 3665 /* 3666 * Handle incoming CHAP packets. 3667 */ 3668 void 3669 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3670 { 3671 STDDCL; 3672 struct lcp_header *h; 3673 int len, x; 3674 u_char *value, *name, digest[AUTHKEYLEN], dsize; 3675 int value_len, name_len; 3676 MD5_CTX ctx; 3677 3678 len = m->m_pkthdr.len; 3679 if (len < 4) { 3680 if (debug) 3681 log(LOG_DEBUG, 3682 SPP_FMT "chap invalid packet length: %d bytes\n", 3683 SPP_ARGS(ifp), len); 3684 return; 3685 } 3686 h = mtod (m, struct lcp_header*); 3687 if (len > ntohs (h->len)) 3688 len = ntohs (h->len); 3689 3690 switch (h->type) { 3691 /* challenge, failure and success are his authproto */ 3692 case CHAP_CHALLENGE: 3693 value = 1 + (u_char*)(h+1); 3694 value_len = value[-1]; 3695 name = value + value_len; 3696 name_len = len - value_len - 5; 3697 if (name_len < 0) { 3698 if (debug) { 3699 log(LOG_DEBUG, 3700 SPP_FMT "chap corrupted challenge " 3701 "<%s id=0x%x len=%d", 3702 SPP_ARGS(ifp), 3703 sppp_auth_type_name(PPP_CHAP, h->type), 3704 h->ident, ntohs(h->len)); 3705 if (len > 4) 3706 sppp_print_bytes((u_char*) (h+1), len-4); 3707 addlog(">\n"); 3708 } 3709 break; 3710 } 3711 3712 if (debug) { 3713 log(LOG_DEBUG, 3714 SPP_FMT "chap input <%s id=0x%x len=%d name=", 3715 SPP_ARGS(ifp), 3716 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3717 ntohs(h->len)); 3718 sppp_print_string((char*) name, name_len); 3719 addlog(" value-size=%d value=", value_len); 3720 sppp_print_bytes(value, value_len); 3721 addlog(">\n"); 3722 } 3723 3724 /* Compute reply value. */ 3725 MD5Init(&ctx); 3726 MD5Update(&ctx, &h->ident, 1); 3727 MD5Update(&ctx, sp->myauth.secret, 3728 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN)); 3729 MD5Update(&ctx, value, value_len); 3730 MD5Final(digest, &ctx); 3731 dsize = sizeof digest; 3732 3733 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3734 sizeof dsize, (const char *)&dsize, 3735 sizeof digest, digest, 3736 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 3737 sp->myauth.name, 3738 0); 3739 break; 3740 3741 case CHAP_SUCCESS: 3742 if (debug) { 3743 log(LOG_DEBUG, SPP_FMT "chap success", 3744 SPP_ARGS(ifp)); 3745 if (len > 4) { 3746 addlog(": "); 3747 sppp_print_string((char*)(h + 1), len - 4); 3748 } 3749 addlog("\n"); 3750 } 3751 x = splnet(); 3752 sp->pp_flags &= ~PP_NEEDAUTH; 3753 if (sp->myauth.proto == PPP_CHAP && 3754 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3755 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3756 /* 3757 * We are authenticator for CHAP but didn't 3758 * complete yet. Leave it to tlu to proceed 3759 * to network phase. 3760 */ 3761 splx(x); 3762 break; 3763 } 3764 splx(x); 3765 sppp_phase_network(sp); 3766 break; 3767 3768 case CHAP_FAILURE: 3769 if (debug) { 3770 log(LOG_INFO, SPP_FMT "chap failure", 3771 SPP_ARGS(ifp)); 3772 if (len > 4) { 3773 addlog(": "); 3774 sppp_print_string((char*)(h + 1), len - 4); 3775 } 3776 addlog("\n"); 3777 } else 3778 log(LOG_INFO, SPP_FMT "chap failure\n", 3779 SPP_ARGS(ifp)); 3780 /* await LCP shutdown by authenticator */ 3781 break; 3782 3783 /* response is my authproto */ 3784 case CHAP_RESPONSE: 3785 value = 1 + (u_char*)(h+1); 3786 value_len = value[-1]; 3787 name = value + value_len; 3788 name_len = len - value_len - 5; 3789 if (name_len < 0) { 3790 if (debug) { 3791 log(LOG_DEBUG, 3792 SPP_FMT "chap corrupted response " 3793 "<%s id=0x%x len=%d", 3794 SPP_ARGS(ifp), 3795 sppp_auth_type_name(PPP_CHAP, h->type), 3796 h->ident, ntohs(h->len)); 3797 if (len > 4) 3798 sppp_print_bytes((u_char*)(h+1), len-4); 3799 addlog(">\n"); 3800 } 3801 break; 3802 } 3803 if (h->ident != sp->confid[IDX_CHAP]) { 3804 if (debug) 3805 log(LOG_DEBUG, 3806 SPP_FMT "chap dropping response for old ID " 3807 "(got %d, expected %d)\n", 3808 SPP_ARGS(ifp), 3809 h->ident, sp->confid[IDX_CHAP]); 3810 break; 3811 } 3812 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) 3813 || bcmp(name, sp->hisauth.name, name_len) != 0) { 3814 log(LOG_INFO, SPP_FMT "chap response, his name ", 3815 SPP_ARGS(ifp)); 3816 sppp_print_string(name, name_len); 3817 addlog(" != expected "); 3818 sppp_print_string(sp->hisauth.name, 3819 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)); 3820 addlog("\n"); 3821 } 3822 if (debug) { 3823 log(LOG_DEBUG, SPP_FMT "chap input(%s) " 3824 "<%s id=0x%x len=%d name=", 3825 SPP_ARGS(ifp), 3826 sppp_state_name(sp->state[IDX_CHAP]), 3827 sppp_auth_type_name(PPP_CHAP, h->type), 3828 h->ident, ntohs (h->len)); 3829 sppp_print_string((char*)name, name_len); 3830 addlog(" value-size=%d value=", value_len); 3831 sppp_print_bytes(value, value_len); 3832 addlog(">\n"); 3833 } 3834 if (value_len != AUTHKEYLEN) { 3835 if (debug) 3836 log(LOG_DEBUG, 3837 SPP_FMT "chap bad hash value length: " 3838 "%d bytes, should be %d\n", 3839 SPP_ARGS(ifp), value_len, 3840 AUTHKEYLEN); 3841 break; 3842 } 3843 3844 MD5Init(&ctx); 3845 MD5Update(&ctx, &h->ident, 1); 3846 MD5Update(&ctx, sp->hisauth.secret, 3847 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN)); 3848 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN); 3849 MD5Final(digest, &ctx); 3850 3851 #define FAILMSG "Failed..." 3852 #define SUCCMSG "Welcome!" 3853 3854 if (value_len != sizeof digest || 3855 bcmp(digest, value, value_len) != 0) { 3856 /* action scn, tld */ 3857 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 3858 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 3859 0); 3860 chap.tld(sp); 3861 break; 3862 } 3863 /* action sca, perhaps tlu */ 3864 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 3865 sp->state[IDX_CHAP] == STATE_OPENED) 3866 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 3867 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 3868 0); 3869 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 3870 sppp_cp_change_state(&chap, sp, STATE_OPENED); 3871 chap.tlu(sp); 3872 } 3873 break; 3874 3875 default: 3876 /* Unknown CHAP packet type -- ignore. */ 3877 if (debug) { 3878 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) " 3879 "<0x%x id=0x%xh len=%d", 3880 SPP_ARGS(ifp), 3881 sppp_state_name(sp->state[IDX_CHAP]), 3882 h->type, h->ident, ntohs(h->len)); 3883 if (len > 4) 3884 sppp_print_bytes((u_char*)(h+1), len-4); 3885 addlog(">\n"); 3886 } 3887 break; 3888 3889 } 3890 } 3891 3892 static void 3893 sppp_chap_init(struct sppp *sp) 3894 { 3895 /* Chap doesn't have STATE_INITIAL at all. */ 3896 sp->state[IDX_CHAP] = STATE_CLOSED; 3897 sp->fail_counter[IDX_CHAP] = 0; 3898 sp->pp_seq[IDX_CHAP] = 0; 3899 sp->pp_rseq[IDX_CHAP] = 0; 3900 callout_init(&sp->ch[IDX_CHAP]); 3901 } 3902 3903 static void 3904 sppp_chap_open(struct sppp *sp) 3905 { 3906 if (sp->myauth.proto == PPP_CHAP && 3907 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 3908 /* we are authenticator for CHAP, start it */ 3909 chap.scr(sp); 3910 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3911 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3912 } 3913 /* nothing to be done if we are peer, await a challenge */ 3914 } 3915 3916 static void 3917 sppp_chap_close(struct sppp *sp) 3918 { 3919 if (sp->state[IDX_CHAP] != STATE_CLOSED) 3920 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3921 } 3922 3923 static void 3924 sppp_chap_TO(void *cookie) 3925 { 3926 struct sppp *sp = (struct sppp *)cookie; 3927 STDDCL; 3928 int s; 3929 3930 s = splnet(); 3931 if (debug) 3932 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n", 3933 SPP_ARGS(ifp), 3934 sppp_state_name(sp->state[IDX_CHAP]), 3935 sp->rst_counter[IDX_CHAP]); 3936 3937 if (--sp->rst_counter[IDX_CHAP] < 0) 3938 /* TO- event */ 3939 switch (sp->state[IDX_CHAP]) { 3940 case STATE_REQ_SENT: 3941 chap.tld(sp); 3942 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3943 break; 3944 } 3945 else 3946 /* TO+ (or TO*) event */ 3947 switch (sp->state[IDX_CHAP]) { 3948 case STATE_OPENED: 3949 /* TO* event */ 3950 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3951 /* fall through */ 3952 case STATE_REQ_SENT: 3953 chap.scr(sp); 3954 /* sppp_cp_change_state() will restart the timer */ 3955 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3956 break; 3957 } 3958 3959 splx(s); 3960 } 3961 3962 static void 3963 sppp_chap_tlu(struct sppp *sp) 3964 { 3965 STDDCL; 3966 int i, x; 3967 3968 i = 0; 3969 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3970 3971 /* 3972 * Some broken CHAP implementations (Conware CoNet, firmware 3973 * 4.0.?) don't want to re-authenticate their CHAP once the 3974 * initial challenge-response exchange has taken place. 3975 * Provide for an option to avoid rechallenges. 3976 */ 3977 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) { 3978 /* 3979 * Compute the re-challenge timeout. This will yield 3980 * a number between 300 and 810 seconds. 3981 */ 3982 i = 300 + ((unsigned)(random() & 0xff00) >> 7); 3983 3984 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 3985 } 3986 3987 if (debug) { 3988 log(LOG_DEBUG, 3989 SPP_FMT "chap %s, ", 3990 SPP_ARGS(ifp), 3991 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu"); 3992 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) 3993 addlog("next re-challenge in %d seconds\n", i); 3994 else 3995 addlog("re-challenging supressed\n"); 3996 } 3997 3998 x = splnet(); 3999 /* indicate to LCP that we need to be closed down */ 4000 sp->lcp.protos |= (1 << IDX_CHAP); 4001 4002 if (sp->pp_flags & PP_NEEDAUTH) { 4003 /* 4004 * Remote is authenticator, but his auth proto didn't 4005 * complete yet. Defer the transition to network 4006 * phase. 4007 */ 4008 splx(x); 4009 return; 4010 } 4011 splx(x); 4012 4013 /* 4014 * If we are already in phase network, we are done here. This 4015 * is the case if this is a dummy tlu event after a re-challenge. 4016 */ 4017 if (sp->pp_phase != PHASE_NETWORK) 4018 sppp_phase_network(sp); 4019 } 4020 4021 static void 4022 sppp_chap_tld(struct sppp *sp) 4023 { 4024 STDDCL; 4025 4026 if (debug) 4027 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp)); 4028 callout_stop(&sp->ch[IDX_CHAP]); 4029 sp->lcp.protos &= ~(1 << IDX_CHAP); 4030 4031 lcp.Close(sp); 4032 } 4033 4034 static void 4035 sppp_chap_scr(struct sppp *sp) 4036 { 4037 struct timeval tv; 4038 u_int32_t *ch, seed; 4039 u_char clen; 4040 4041 /* Compute random challenge. */ 4042 ch = (u_int32_t *)sp->myauth.challenge; 4043 microtime(&tv); 4044 seed = tv.tv_sec ^ tv.tv_usec; 4045 ch[0] = seed ^ random(); 4046 ch[1] = seed ^ random(); 4047 ch[2] = seed ^ random(); 4048 ch[3] = seed ^ random(); 4049 clen = AUTHKEYLEN; 4050 4051 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4052 4053 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4054 sizeof clen, (const char *)&clen, 4055 (size_t)AUTHKEYLEN, sp->myauth.challenge, 4056 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 4057 sp->myauth.name, 4058 0); 4059 } 4060 /* 4062 *--------------------------------------------------------------------------* 4063 * * 4064 * The PAP implementation. * 4065 * * 4066 *--------------------------------------------------------------------------* 4067 */ 4068 /* 4069 * For PAP, we need to keep a little state also if we are the peer, not the 4070 * authenticator. This is since we don't get a request to authenticate, but 4071 * have to repeatedly authenticate ourself until we got a response (or the 4072 * retry counter is expired). 4073 */ 4074 4075 /* 4076 * Handle incoming PAP packets. */ 4077 static void 4078 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4079 { 4080 STDDCL; 4081 struct lcp_header *h; 4082 int len, x; 4083 u_char *name, *passwd, mlen; 4084 int name_len, passwd_len; 4085 4086 len = m->m_pkthdr.len; 4087 if (len < 5) { 4088 if (debug) 4089 log(LOG_DEBUG, 4090 SPP_FMT "pap invalid packet length: %d bytes\n", 4091 SPP_ARGS(ifp), len); 4092 return; 4093 } 4094 h = mtod (m, struct lcp_header*); 4095 if (len > ntohs (h->len)) 4096 len = ntohs (h->len); 4097 switch (h->type) { 4098 /* PAP request is my authproto */ 4099 case PAP_REQ: 4100 name = 1 + (u_char*)(h+1); 4101 name_len = name[-1]; 4102 passwd = name + name_len + 1; 4103 if (name_len > len - 6 || 4104 (passwd_len = passwd[-1]) > len - 6 - name_len) { 4105 if (debug) { 4106 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4107 "<%s id=0x%x len=%d", 4108 SPP_ARGS(ifp), 4109 sppp_auth_type_name(PPP_PAP, h->type), 4110 h->ident, ntohs(h->len)); 4111 if (len > 4) 4112 sppp_print_bytes((u_char*)(h+1), len-4); 4113 addlog(">\n"); 4114 } 4115 break; 4116 } 4117 if (debug) { 4118 log(LOG_DEBUG, SPP_FMT "pap input(%s) " 4119 "<%s id=0x%x len=%d name=", 4120 SPP_ARGS(ifp), 4121 sppp_state_name(sp->state[IDX_PAP]), 4122 sppp_auth_type_name(PPP_PAP, h->type), 4123 h->ident, ntohs(h->len)); 4124 sppp_print_string((char*)name, name_len); 4125 addlog(" passwd="); 4126 sppp_print_string((char*)passwd, passwd_len); 4127 addlog(">\n"); 4128 } 4129 if (name_len > AUTHNAMELEN || 4130 passwd_len > AUTHKEYLEN || 4131 bcmp(name, sp->hisauth.name, name_len) != 0 || 4132 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) { 4133 /* action scn, tld */ 4134 mlen = sizeof(FAILMSG) - 1; 4135 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4136 sizeof mlen, (const char *)&mlen, 4137 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4138 0); 4139 pap.tld(sp); 4140 break; 4141 } 4142 /* action sca, perhaps tlu */ 4143 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4144 sp->state[IDX_PAP] == STATE_OPENED) { 4145 mlen = sizeof(SUCCMSG) - 1; 4146 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4147 sizeof mlen, (const char *)&mlen, 4148 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4149 0); 4150 } 4151 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4152 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4153 pap.tlu(sp); 4154 } 4155 break; 4156 4157 /* ack and nak are his authproto */ 4158 case PAP_ACK: 4159 callout_stop(&sp->pap_my_to_ch); 4160 if (debug) { 4161 log(LOG_DEBUG, SPP_FMT "pap success", 4162 SPP_ARGS(ifp)); 4163 name_len = *(char *)h; 4164 if (len > 5 && name_len) { 4165 addlog(": "); 4166 sppp_print_string((char*)(h+1), name_len); 4167 } 4168 addlog("\n"); 4169 } 4170 x = splnet(); 4171 sp->pp_flags &= ~PP_NEEDAUTH; 4172 if (sp->myauth.proto == PPP_PAP && 4173 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4174 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4175 /* 4176 * We are authenticator for PAP but didn't 4177 * complete yet. Leave it to tlu to proceed 4178 * to network phase. 4179 */ 4180 splx(x); 4181 break; 4182 } 4183 splx(x); 4184 sppp_phase_network(sp); 4185 break; 4186 4187 case PAP_NAK: 4188 callout_stop(&sp->pap_my_to_ch); 4189 if (debug) { 4190 log(LOG_INFO, SPP_FMT "pap failure", 4191 SPP_ARGS(ifp)); 4192 name_len = *(char *)h; 4193 if (len > 5 && name_len) { 4194 addlog(": "); 4195 sppp_print_string((char*)(h+1), name_len); 4196 } 4197 addlog("\n"); 4198 } else 4199 log(LOG_INFO, SPP_FMT "pap failure\n", 4200 SPP_ARGS(ifp)); 4201 /* await LCP shutdown by authenticator */ 4202 break; 4203 4204 default: 4205 /* Unknown PAP packet type -- ignore. */ 4206 if (debug) { 4207 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4208 "<0x%x id=0x%x len=%d", 4209 SPP_ARGS(ifp), 4210 h->type, h->ident, ntohs(h->len)); 4211 if (len > 4) 4212 sppp_print_bytes((u_char*)(h+1), len-4); 4213 addlog(">\n"); 4214 } 4215 break; 4216 4217 } 4218 } 4219 4220 static void 4221 sppp_pap_init(struct sppp *sp) 4222 { 4223 /* PAP doesn't have STATE_INITIAL at all. */ 4224 sp->state[IDX_PAP] = STATE_CLOSED; 4225 sp->fail_counter[IDX_PAP] = 0; 4226 sp->pp_seq[IDX_PAP] = 0; 4227 sp->pp_rseq[IDX_PAP] = 0; 4228 callout_init(&sp->ch[IDX_PAP]); 4229 callout_init(&sp->pap_my_to_ch); 4230 } 4231 4232 static void 4233 sppp_pap_open(struct sppp *sp) 4234 { 4235 if (sp->hisauth.proto == PPP_PAP && 4236 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4237 /* we are authenticator for PAP, start our timer */ 4238 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4239 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4240 } 4241 if (sp->myauth.proto == PPP_PAP) { 4242 /* we are peer, send a request, and start a timer */ 4243 pap.scr(sp); 4244 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4245 sppp_pap_my_TO, sp); 4246 } 4247 } 4248 4249 static void 4250 sppp_pap_close(struct sppp *sp) 4251 { 4252 if (sp->state[IDX_PAP] != STATE_CLOSED) 4253 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4254 } 4255 4256 /* 4257 * That's the timeout routine if we are authenticator. Since the 4258 * authenticator is basically passive in PAP, we can't do much here. 4259 */ 4260 static void 4261 sppp_pap_TO(void *cookie) 4262 { 4263 struct sppp *sp = (struct sppp *)cookie; 4264 STDDCL; 4265 int s; 4266 4267 s = splnet(); 4268 if (debug) 4269 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n", 4270 SPP_ARGS(ifp), 4271 sppp_state_name(sp->state[IDX_PAP]), 4272 sp->rst_counter[IDX_PAP]); 4273 4274 if (--sp->rst_counter[IDX_PAP] < 0) 4275 /* TO- event */ 4276 switch (sp->state[IDX_PAP]) { 4277 case STATE_REQ_SENT: 4278 pap.tld(sp); 4279 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4280 break; 4281 } 4282 else 4283 /* TO+ event, not very much we could do */ 4284 switch (sp->state[IDX_PAP]) { 4285 case STATE_REQ_SENT: 4286 /* sppp_cp_change_state() will restart the timer */ 4287 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4288 break; 4289 } 4290 4291 splx(s); 4292 } 4293 4294 /* 4295 * That's the timeout handler if we are peer. Since the peer is active, 4296 * we need to retransmit our PAP request since it is apparently lost. 4297 * XXX We should impose a max counter. 4298 */ 4299 static void 4300 sppp_pap_my_TO(void *cookie) 4301 { 4302 struct sppp *sp = (struct sppp *)cookie; 4303 STDDCL; 4304 4305 if (debug) 4306 log(LOG_DEBUG, SPP_FMT "pap peer TO\n", 4307 SPP_ARGS(ifp)); 4308 4309 pap.scr(sp); 4310 } 4311 4312 static void 4313 sppp_pap_tlu(struct sppp *sp) 4314 { 4315 STDDCL; 4316 int x; 4317 4318 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4319 4320 if (debug) 4321 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 4322 SPP_ARGS(ifp), pap.name); 4323 4324 x = splnet(); 4325 /* indicate to LCP that we need to be closed down */ 4326 sp->lcp.protos |= (1 << IDX_PAP); 4327 4328 if (sp->pp_flags & PP_NEEDAUTH) { 4329 /* 4330 * Remote is authenticator, but his auth proto didn't 4331 * complete yet. Defer the transition to network 4332 * phase. 4333 */ 4334 splx(x); 4335 return; 4336 } 4337 splx(x); 4338 sppp_phase_network(sp); 4339 } 4340 4341 static void 4342 sppp_pap_tld(struct sppp *sp) 4343 { 4344 STDDCL; 4345 4346 if (debug) 4347 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp)); 4348 callout_stop(&sp->ch[IDX_PAP]); 4349 callout_stop(&sp->pap_my_to_ch); 4350 sp->lcp.protos &= ~(1 << IDX_PAP); 4351 4352 lcp.Close(sp); 4353 } 4354 4355 static void 4356 sppp_pap_scr(struct sppp *sp) 4357 { 4358 u_char idlen, pwdlen; 4359 4360 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4361 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN); 4362 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN); 4363 4364 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4365 sizeof idlen, (const char *)&idlen, 4366 (size_t)idlen, sp->myauth.name, 4367 sizeof pwdlen, (const char *)&pwdlen, 4368 (size_t)pwdlen, sp->myauth.secret, 4369 0); 4370 } 4371 /* 4373 * Random miscellaneous functions. 4374 */ 4375 4376 /* 4377 * Send a PAP or CHAP proto packet. 4378 * 4379 * Varadic function, each of the elements for the ellipsis is of type 4380 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4381 * mlen == 0. 4382 * NOTE: never declare variadic functions with types subject to type 4383 * promotion (i.e. u_char). This is asking for big trouble depending 4384 * on the architecture you are on... 4385 */ 4386 4387 static void 4388 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4389 unsigned int type, unsigned int id, 4390 ...) 4391 { 4392 STDDCL; 4393 struct lcp_header *lh; 4394 struct mbuf *m; 4395 u_char *p; 4396 int len; 4397 size_t pkthdrlen; 4398 unsigned int mlen; 4399 const char *msg; 4400 va_list ap; 4401 4402 MGETHDR (m, M_DONTWAIT, MT_DATA); 4403 if (! m) 4404 return; 4405 m->m_pkthdr.rcvif = 0; 4406 4407 if (sp->pp_flags & PP_NOFRAMING) { 4408 *mtod(m, u_int16_t*) = htons(cp->proto); 4409 pkthdrlen = 2; 4410 lh = (struct lcp_header*)(mtod(m, u_int8_t*)+2); 4411 } else { 4412 struct ppp_header *h; 4413 h = mtod (m, struct ppp_header*); 4414 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4415 h->control = PPP_UI; /* Unnumbered Info */ 4416 h->protocol = htons(cp->proto); 4417 pkthdrlen = PPP_HEADER_LEN; 4418 4419 lh = (struct lcp_header*)(h + 1); 4420 } 4421 4422 lh->type = type; 4423 lh->ident = id; 4424 p = (u_char*) (lh+1); 4425 4426 va_start(ap, id); 4427 len = 0; 4428 4429 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4430 msg = va_arg(ap, const char *); 4431 len += mlen; 4432 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4433 va_end(ap); 4434 m_freem(m); 4435 return; 4436 } 4437 4438 bcopy(msg, p, mlen); 4439 p += mlen; 4440 } 4441 va_end(ap); 4442 4443 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4444 lh->len = htons (LCP_HEADER_LEN + len); 4445 4446 if (debug) { 4447 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 4448 SPP_ARGS(ifp), cp->name, 4449 sppp_auth_type_name(cp->proto, lh->type), 4450 lh->ident, ntohs(lh->len)); 4451 if (len) 4452 sppp_print_bytes((u_char*) (lh+1), len); 4453 addlog(">\n"); 4454 } 4455 if (IF_QFULL (&sp->pp_cpq)) { 4456 IF_DROP (&sp->pp_fastq); 4457 IF_DROP (&ifp->if_snd); 4458 m_freem (m); 4459 ++ifp->if_oerrors; 4460 } else 4461 IF_ENQUEUE (&sp->pp_cpq, m); 4462 if (! (ifp->if_flags & IFF_OACTIVE)) 4463 (*ifp->if_start) (ifp); 4464 ifp->if_obytes += m->m_pkthdr.len + 3; 4465 } 4466 4467 /* 4468 * Send keepalive packets, every 10 seconds. 4469 */ 4470 static void 4471 sppp_keepalive(void *dummy) 4472 { 4473 struct sppp *sp; 4474 int s; 4475 4476 s = splnet(); 4477 for (sp=spppq; sp; sp=sp->pp_next) { 4478 struct ifnet *ifp = &sp->pp_if; 4479 4480 /* Keepalive mode disabled or channel down? */ 4481 if (! (sp->pp_flags & PP_KEEPALIVE) || 4482 ! (ifp->if_flags & IFF_RUNNING)) 4483 continue; 4484 4485 /* No keepalive in PPP mode if LCP not opened yet. */ 4486 if (! (sp->pp_flags & PP_CISCO) && 4487 sp->pp_phase < PHASE_AUTHENTICATE) 4488 continue; 4489 4490 if (sp->pp_alivecnt == MAXALIVECNT) { 4491 /* No keepalive packets got. Stop the interface. */ 4492 printf (SPP_FMT "down\n", SPP_ARGS(ifp)); 4493 if_down (ifp); 4494 IF_PURGE (&sp->pp_cpq); 4495 if (! (sp->pp_flags & PP_CISCO)) { 4496 /* XXX */ 4497 /* Shut down the PPP link. */ 4498 lcp.Down(sp); 4499 /* Initiate negotiation. XXX */ 4500 lcp.Up(sp); 4501 } 4502 } 4503 if (sp->pp_alivecnt <= MAXALIVECNT) 4504 ++sp->pp_alivecnt; 4505 if (sp->pp_flags & PP_CISCO) 4506 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, 4507 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4508 else if (sp->pp_phase >= PHASE_AUTHENTICATE) { 4509 int32_t nmagic = htonl (sp->lcp.magic); 4510 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4511 sppp_cp_send (sp, PPP_LCP, ECHO_REQ, 4512 sp->lcp.echoid, 4, &nmagic); 4513 } 4514 } 4515 splx(s); 4516 callout_reset(&keepalive_ch, hz * 10, sppp_keepalive, NULL); 4517 } 4518 4519 /* 4520 * Get both IP addresses. 4521 */ 4522 static void 4523 sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, u_int32_t *srcmask) 4524 { 4525 struct ifnet *ifp = &sp->pp_if; 4526 struct ifaddr *ifa; 4527 struct sockaddr_in *si, *sm; 4528 u_int32_t ssrc, ddst; 4529 4530 sm = NULL; 4531 ssrc = ddst = 0; 4532 /* 4533 * Pick the first AF_INET address from the list, 4534 * aliases don't make any sense on a p2p link anyway. 4535 */ 4536 si = 0; 4537 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 4538 if (ifa->ifa_addr->sa_family == AF_INET) { 4539 si = (struct sockaddr_in *)ifa->ifa_addr; 4540 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4541 if (si) 4542 break; 4543 } 4544 } 4545 if (ifa) { 4546 if (si && si->sin_addr.s_addr) { 4547 ssrc = si->sin_addr.s_addr; 4548 if (srcmask) 4549 *srcmask = ntohl(sm->sin_addr.s_addr); 4550 } 4551 4552 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4553 if (si && si->sin_addr.s_addr) 4554 ddst = si->sin_addr.s_addr; 4555 } 4556 4557 if (dst) *dst = ntohl(ddst); 4558 if (src) *src = ntohl(ssrc); 4559 } 4560 4561 /* 4562 * Set my IP address. Must be called at splnet. 4563 */ 4564 static void 4565 sppp_set_ip_addr(struct sppp *sp, u_int32_t src) 4566 { 4567 STDDCL; 4568 struct ifaddr *ifa; 4569 struct sockaddr_in *si; 4570 4571 /* 4572 * Pick the first AF_INET address from the list, 4573 * aliases don't make any sense on a p2p link anyway. 4574 */ 4575 4576 si = 0; 4577 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4578 { 4579 if (ifa->ifa_addr->sa_family == AF_INET) 4580 { 4581 si = (struct sockaddr_in *)ifa->ifa_addr; 4582 if (si) 4583 break; 4584 } 4585 } 4586 4587 if (ifa && si) 4588 { 4589 int error; 4590 struct sockaddr_in new_sin = *si; 4591 4592 new_sin.sin_addr.s_addr = htonl(src); 4593 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 1); 4594 if(debug && error) 4595 { 4596 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: in_ifinit " 4597 " failed, error=%d\n", SPP_ARGS(ifp), error); 4598 } 4599 } 4600 } 4601 4602 #ifdef INET6 4603 /* 4604 * Get both IPv6 addresses. 4605 */ 4606 static void 4607 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4608 struct in6_addr *srcmask) 4609 { 4610 struct ifnet *ifp = &sp->pp_if; 4611 struct ifaddr *ifa; 4612 struct sockaddr_in6 *si, *sm; 4613 struct in6_addr ssrc, ddst; 4614 4615 sm = NULL; 4616 memset(&ssrc, 0, sizeof(ssrc)); 4617 memset(&ddst, 0, sizeof(ddst)); 4618 /* 4619 * Pick the first link-local AF_INET6 address from the list, 4620 * aliases don't make any sense on a p2p link anyway. 4621 */ 4622 si = 0; 4623 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4624 if (ifa->ifa_addr->sa_family == AF_INET6) { 4625 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4626 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4627 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4628 break; 4629 } 4630 if (ifa) { 4631 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4632 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 4633 if (srcmask) { 4634 bcopy(&sm->sin6_addr, srcmask, 4635 sizeof(*srcmask)); 4636 } 4637 } 4638 4639 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4640 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4641 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 4642 } 4643 4644 if (dst) 4645 bcopy(&ddst, dst, sizeof(*dst)); 4646 if (src) 4647 bcopy(&ssrc, src, sizeof(*src)); 4648 } 4649 4650 #ifdef IPV6CP_MYIFID_DYN 4651 /* 4652 * Generate random ifid. 4653 */ 4654 static void 4655 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 4656 { 4657 /* TBD */ 4658 } 4659 4660 /* 4661 * Set my IPv6 address. Must be called at splnet. 4662 */ 4663 static void 4664 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 4665 { 4666 STDDCL; 4667 struct ifaddr *ifa; 4668 struct sockaddr_in6 *sin6; 4669 4670 /* 4671 * Pick the first link-local AF_INET6 address from the list, 4672 * aliases don't make any sense on a p2p link anyway. 4673 */ 4674 4675 sin6 = NULL; 4676 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4677 { 4678 if (ifa->ifa_addr->sa_family == AF_INET6) 4679 { 4680 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 4681 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 4682 break; 4683 } 4684 } 4685 4686 if (ifa && sin6) 4687 { 4688 int error; 4689 struct sockaddr_in6 new_sin6 = *sin6; 4690 4691 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 4692 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 4693 if (debug && error) 4694 { 4695 log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit " 4696 " failed, error=%d\n", SPP_ARGS(ifp), error); 4697 } 4698 } 4699 } 4700 #endif 4701 4702 /* 4703 * Suggest a candidate address to be used by peer. 4704 */ 4705 static void 4706 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 4707 { 4708 struct in6_addr myaddr; 4709 struct timeval tv; 4710 4711 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 4712 4713 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 4714 microtime(&tv); 4715 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 4716 myaddr.s6_addr[14] ^= 0xff; 4717 myaddr.s6_addr[15] ^= 0xff; 4718 } else { 4719 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 4720 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 4721 } 4722 if (suggest) 4723 bcopy(&myaddr, suggest, sizeof(myaddr)); 4724 } 4725 #endif /*INET6*/ 4726 4727 static int 4728 sppp_params(struct sppp *sp, int cmd, void *data) 4729 { 4730 struct ifreq *ifr = (struct ifreq *)data; 4731 struct spppreq spr; 4732 4733 #if 0 4734 /* 4735 * ifr->ifr_data is supposed to point to a struct spppreq. 4736 * Check the cmd word first before attempting to fetch all the 4737 * data. 4738 */ 4739 if ((subcmd = fuword(ifr->ifr_data)) == -1) 4740 return EFAULT; 4741 #endif 4742 4743 if (copyin((caddr_t)ifr->ifr_data, &spr, sizeof spr) != 0) 4744 return EFAULT; 4745 4746 switch (spr.cmd) { 4747 case SPPPIOGDEFS: 4748 if (cmd != (int)SIOCGIFGENERIC) 4749 return EINVAL; 4750 /* 4751 * We copy over the entire current state, but clean 4752 * out some of the stuff we don't wanna pass up. 4753 * Remember, SIOCGIFGENERIC is unprotected, and can be 4754 * called by any user. No need to ever get PAP or 4755 * CHAP secrets back to userland anyway. 4756 */ 4757 bcopy(sp, &spr.defs, sizeof(struct sppp)); 4758 memset(spr.defs.myauth.secret, 0, AUTHKEYLEN); 4759 memset(spr.defs.myauth.challenge, 0, AUTHKEYLEN); 4760 memset(spr.defs.hisauth.secret, 0, AUTHKEYLEN); 4761 memset(spr.defs.hisauth.challenge, 0, AUTHKEYLEN); 4762 return copyout(&spr, (caddr_t)ifr->ifr_data, sizeof spr); 4763 4764 case SPPPIOSDEFS: 4765 if (cmd != (int)SIOCSIFGENERIC) 4766 return EINVAL; 4767 /* 4768 * We have a very specific idea of which fields we allow 4769 * being passed back from userland, so to not clobber our 4770 * current state. For one, we only allow setting 4771 * anything if LCP is in dead phase. Once the LCP 4772 * negotiations started, the authentication settings must 4773 * not be changed again. (The administrator can force an 4774 * ifconfig down in order to get LCP back into dead 4775 * phase.) 4776 * 4777 * Also, we only allow for authentication parameters to be 4778 * specified. 4779 * 4780 * XXX Should allow to set or clear pp_flags. 4781 * 4782 * Finally, if the respective authentication protocol to 4783 * be used is set differently than 0, but the secret is 4784 * passed as all zeros, we don't trash the existing secret. 4785 * This allows an administrator to change the system name 4786 * only without clobbering the secret (which he didn't get 4787 * back in a previous SPPPIOGDEFS call). However, the 4788 * secrets are cleared if the authentication protocol is 4789 * reset to 0. 4790 */ 4791 if (sp->pp_phase != PHASE_DEAD) 4792 return EBUSY; 4793 4794 if ((spr.defs.myauth.proto != 0 && spr.defs.myauth.proto != PPP_PAP && 4795 spr.defs.myauth.proto != PPP_CHAP) || 4796 (spr.defs.hisauth.proto != 0 && spr.defs.hisauth.proto != PPP_PAP && 4797 spr.defs.hisauth.proto != PPP_CHAP)) 4798 return EINVAL; 4799 4800 if (spr.defs.myauth.proto == 0) 4801 /* resetting myauth */ 4802 memset(&sp->myauth, 0, sizeof sp->myauth); 4803 else { 4804 /* setting/changing myauth */ 4805 sp->myauth.proto = spr.defs.myauth.proto; 4806 bcopy(spr.defs.myauth.name, sp->myauth.name, AUTHNAMELEN); 4807 if (spr.defs.myauth.secret[0] != '\0') 4808 bcopy(spr.defs.myauth.secret, sp->myauth.secret, 4809 AUTHKEYLEN); 4810 } 4811 if (spr.defs.hisauth.proto == 0) 4812 /* resetting hisauth */ 4813 memset(&sp->hisauth, 0, sizeof sp->hisauth); 4814 else { 4815 /* setting/changing hisauth */ 4816 sp->hisauth.proto = spr.defs.hisauth.proto; 4817 sp->hisauth.flags = spr.defs.hisauth.flags; 4818 bcopy(spr.defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN); 4819 if (spr.defs.hisauth.secret[0] != '\0') 4820 bcopy(spr.defs.hisauth.secret, sp->hisauth.secret, 4821 AUTHKEYLEN); 4822 } 4823 break; 4824 4825 default: 4826 return EINVAL; 4827 } 4828 4829 return 0; 4830 } 4831 4832 static void 4833 sppp_phase_network(struct sppp *sp) 4834 { 4835 STDDCL; 4836 int i; 4837 u_int32_t mask; 4838 4839 sp->pp_phase = PHASE_NETWORK; 4840 4841 if(debug) 4842 { 4843 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 4844 sppp_phase_name(sp->pp_phase)); 4845 } 4846 4847 /* Notify NCPs now. */ 4848 for (i = 0; i < IDX_COUNT; i++) 4849 if ((cps[i])->flags & CP_NCP) 4850 (cps[i])->Open(sp); 4851 4852 /* Send Up events to all NCPs. */ 4853 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 4854 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 4855 (cps[i])->Up(sp); 4856 4857 /* if no NCP is starting, all this was in vain, close down */ 4858 sppp_lcp_check_and_close(sp); 4859 } 4860 4861 4862 static const char * 4863 sppp_cp_type_name(u_char type) 4864 { 4865 static char buf[12]; 4866 switch (type) { 4867 case CONF_REQ: return "conf-req"; 4868 case CONF_ACK: return "conf-ack"; 4869 case CONF_NAK: return "conf-nak"; 4870 case CONF_REJ: return "conf-rej"; 4871 case TERM_REQ: return "term-req"; 4872 case TERM_ACK: return "term-ack"; 4873 case CODE_REJ: return "code-rej"; 4874 case PROTO_REJ: return "proto-rej"; 4875 case ECHO_REQ: return "echo-req"; 4876 case ECHO_REPLY: return "echo-reply"; 4877 case DISC_REQ: return "discard-req"; 4878 } 4879 sprintf (buf, "0x%x", type); 4880 return buf; 4881 } 4882 4883 static const char * 4884 sppp_auth_type_name(u_short proto, u_char type) 4885 { 4886 static char buf[12]; 4887 switch (proto) { 4888 case PPP_CHAP: 4889 switch (type) { 4890 case CHAP_CHALLENGE: return "challenge"; 4891 case CHAP_RESPONSE: return "response"; 4892 case CHAP_SUCCESS: return "success"; 4893 case CHAP_FAILURE: return "failure"; 4894 } 4895 case PPP_PAP: 4896 switch (type) { 4897 case PAP_REQ: return "req"; 4898 case PAP_ACK: return "ack"; 4899 case PAP_NAK: return "nak"; 4900 } 4901 } 4902 sprintf (buf, "0x%x", type); 4903 return buf; 4904 } 4905 4906 static const char * 4907 sppp_lcp_opt_name(u_char opt) 4908 { 4909 static char buf[12]; 4910 switch (opt) { 4911 case LCP_OPT_MRU: return "mru"; 4912 case LCP_OPT_ASYNC_MAP: return "async-map"; 4913 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 4914 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 4915 case LCP_OPT_MAGIC: return "magic"; 4916 case LCP_OPT_PROTO_COMP: return "proto-comp"; 4917 case LCP_OPT_ADDR_COMP: return "addr-comp"; 4918 } 4919 sprintf (buf, "0x%x", opt); 4920 return buf; 4921 } 4922 4923 static const char * 4924 sppp_ipcp_opt_name(u_char opt) 4925 { 4926 static char buf[12]; 4927 switch (opt) { 4928 case IPCP_OPT_ADDRESSES: return "addresses"; 4929 case IPCP_OPT_COMPRESSION: return "compression"; 4930 case IPCP_OPT_ADDRESS: return "address"; 4931 } 4932 sprintf (buf, "0x%x", opt); 4933 return buf; 4934 } 4935 4936 #ifdef INET6 4937 static const char * 4938 sppp_ipv6cp_opt_name(u_char opt) 4939 { 4940 static char buf[12]; 4941 switch (opt) { 4942 case IPV6CP_OPT_IFID: return "ifid"; 4943 case IPV6CP_OPT_COMPRESSION: return "compression"; 4944 } 4945 sprintf (buf, "0x%x", opt); 4946 return buf; 4947 } 4948 #endif 4949 4950 static const char * 4951 sppp_state_name(int state) 4952 { 4953 switch (state) { 4954 case STATE_INITIAL: return "initial"; 4955 case STATE_STARTING: return "starting"; 4956 case STATE_CLOSED: return "closed"; 4957 case STATE_STOPPED: return "stopped"; 4958 case STATE_CLOSING: return "closing"; 4959 case STATE_STOPPING: return "stopping"; 4960 case STATE_REQ_SENT: return "req-sent"; 4961 case STATE_ACK_RCVD: return "ack-rcvd"; 4962 case STATE_ACK_SENT: return "ack-sent"; 4963 case STATE_OPENED: return "opened"; 4964 } 4965 return "illegal"; 4966 } 4967 4968 static const char * 4969 sppp_phase_name(enum ppp_phase phase) 4970 { 4971 switch (phase) { 4972 case PHASE_DEAD: return "dead"; 4973 case PHASE_ESTABLISH: return "establish"; 4974 case PHASE_TERMINATE: return "terminate"; 4975 case PHASE_AUTHENTICATE: return "authenticate"; 4976 case PHASE_NETWORK: return "network"; 4977 } 4978 return "illegal"; 4979 } 4980 4981 static const char * 4982 sppp_proto_name(u_short proto) 4983 { 4984 static char buf[12]; 4985 switch (proto) { 4986 case PPP_LCP: return "lcp"; 4987 case PPP_IPCP: return "ipcp"; 4988 case PPP_PAP: return "pap"; 4989 case PPP_CHAP: return "chap"; 4990 case PPP_IPV6CP: return "ipv6cp"; 4991 } 4992 sprintf(buf, "0x%x", (unsigned)proto); 4993 return buf; 4994 } 4995 4996 static void 4997 sppp_print_bytes(const u_char *p, u_short len) 4998 { 4999 addlog(" %02x", *p++); 5000 while (--len > 0) 5001 addlog("-%02x", *p++); 5002 } 5003 5004 static void 5005 sppp_print_string(const char *p, u_short len) 5006 { 5007 u_char c; 5008 5009 while (len-- > 0) { 5010 c = *p++; 5011 /* 5012 * Print only ASCII chars directly. RFC 1994 recommends 5013 * using only them, but we don't rely on it. */ 5014 if (c < ' ' || c > '~') 5015 addlog("\\x%x", c); 5016 else 5017 addlog("%c", c); 5018 } 5019 } 5020 5021 static const char * 5022 sppp_dotted_quad(u_int32_t addr) 5023 { 5024 static char s[16]; 5025 sprintf(s, "%d.%d.%d.%d", 5026 (int)((addr >> 24) & 0xff), 5027 (int)((addr >> 16) & 0xff), 5028 (int)((addr >> 8) & 0xff), 5029 (int)(addr & 0xff)); 5030 return s; 5031 } 5032 5033 static int 5034 sppp_strnlen(u_char *p, int max) 5035 { 5036 int len; 5037 5038 for (len = 0; len < max && *p; ++p) 5039 ++len; 5040 return len; 5041 } 5042 5043 /* a dummy, used to drop uninteresting events */ 5044 static void 5045 sppp_null(struct sppp *unused) 5046 { 5047 /* do just nothing */ 5048 } 5049 /* 5050 * This file is large. Tell emacs to highlight it nevertheless. 5051 * 5052 * Local Variables: 5053 * hilit-auto-highlight-maxout: 120000 5054 * End: 5055 */ 5056
Indexes created Fri Sep 26 20:09:58 GMT 2025