if_spppsubr.c revision 1.31
1 /* $NetBSD: if_spppsubr.c,v 1.31 2001/12/08 19:46:39 martin 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 1.31 2001/12/08 19:46:39 martin 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 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 137 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 138 139 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 140 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 141 142 #define PAP_REQ 1 /* PAP name/password request */ 143 #define PAP_ACK 2 /* PAP acknowledge */ 144 #define PAP_NAK 3 /* PAP fail */ 145 146 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 147 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 148 #define CHAP_SUCCESS 3 /* CHAP response ok */ 149 #define CHAP_FAILURE 4 /* CHAP response failed */ 150 151 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 152 153 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 154 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 155 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 156 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 157 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 158 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 159 160 /* states are named and numbered according to RFC 1661 */ 161 #define STATE_INITIAL 0 162 #define STATE_STARTING 1 163 #define STATE_CLOSED 2 164 #define STATE_STOPPED 3 165 #define STATE_CLOSING 4 166 #define STATE_STOPPING 5 167 #define STATE_REQ_SENT 6 168 #define STATE_ACK_RCVD 7 169 #define STATE_ACK_SENT 8 170 #define STATE_OPENED 9 171 172 struct ppp_header { 173 u_char address; 174 u_char control; 175 u_short protocol; 176 } __attribute__((__packed__)); 177 #define PPP_HEADER_LEN sizeof (struct ppp_header) 178 179 struct lcp_header { 180 u_char type; 181 u_char ident; 182 u_short len; 183 } __attribute__((__packed__)); 184 #define LCP_HEADER_LEN sizeof (struct lcp_header) 185 186 struct cisco_packet { 187 u_int32_t type; 188 u_int32_t par1; 189 u_int32_t par2; 190 u_short rel; 191 u_short time0; 192 u_short time1; 193 } __attribute__((__packed__)); 194 #define CISCO_PACKET_LEN 18 195 196 /* 197 * We follow the spelling and capitalization of RFC 1661 here, to make 198 * it easier comparing with the standard. Please refer to this RFC in 199 * case you can't make sense out of these abbreviation; it will also 200 * explain the semantics related to the various events and actions. 201 */ 202 struct cp { 203 u_short proto; /* PPP control protocol number */ 204 u_char protoidx; /* index into state table in struct sppp */ 205 u_char flags; 206 #define CP_LCP 0x01 /* this is the LCP */ 207 #define CP_AUTH 0x02 /* this is an authentication protocol */ 208 #define CP_NCP 0x04 /* this is a NCP */ 209 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 210 const char *name; /* name of this control protocol */ 211 /* event handlers */ 212 void (*Up)(struct sppp *sp); 213 void (*Down)(struct sppp *sp); 214 void (*Open)(struct sppp *sp); 215 void (*Close)(struct sppp *sp); 216 void (*TO)(void *sp); 217 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 218 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 219 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 220 /* actions */ 221 void (*tlu)(struct sppp *sp); 222 void (*tld)(struct sppp *sp); 223 void (*tls)(struct sppp *sp); 224 void (*tlf)(struct sppp *sp); 225 void (*scr)(struct sppp *sp); 226 }; 227 228 static struct sppp *spppq; 229 static struct callout keepalive_ch; 230 231 #ifdef __FreeBSD__ 232 #define SPP_FMT "%s%d: " 233 #define SPP_ARGS(ifp) (ifp)->if_name, (ifp)->if_unit 234 #else 235 #define SPP_FMT "%s: " 236 #define SPP_ARGS(ifp) (ifp)->if_xname 237 #endif 238 239 #ifdef INET 240 /* 241 * The following disgusting hack gets around the problem that IP TOS 242 * can't be set yet. We want to put "interactive" traffic on a high 243 * priority queue. To decide if traffic is interactive, we check that 244 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 245 * 246 * XXX is this really still necessary? - joerg - 247 */ 248 static u_short interactive_ports[8] = { 249 0, 513, 0, 0, 250 0, 21, 0, 23, 251 }; 252 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 253 #endif 254 255 /* almost every function needs these */ 256 #define STDDCL \ 257 struct ifnet *ifp = &sp->pp_if; \ 258 int debug = ifp->if_flags & IFF_DEBUG 259 260 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 261 struct sockaddr *dst, struct rtentry *rt); 262 263 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 264 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 265 266 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 267 struct mbuf *m); 268 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 269 u_char ident, u_short len, void *data); 270 /* static void sppp_cp_timeout(void *arg); */ 271 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 272 int newstate); 273 static void sppp_auth_send(const struct cp *cp, 274 struct sppp *sp, unsigned int type, unsigned int id, 275 ...); 276 277 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 278 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 279 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 280 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 281 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 282 283 static void sppp_null(struct sppp *sp); 284 285 static void sppp_lcp_init(struct sppp *sp); 286 static void sppp_lcp_up(struct sppp *sp); 287 static void sppp_lcp_down(struct sppp *sp); 288 static void sppp_lcp_open(struct sppp *sp); 289 static void sppp_lcp_close(struct sppp *sp); 290 static void sppp_lcp_TO(void *sp); 291 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 292 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 293 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 294 static void sppp_lcp_tlu(struct sppp *sp); 295 static void sppp_lcp_tld(struct sppp *sp); 296 static void sppp_lcp_tls(struct sppp *sp); 297 static void sppp_lcp_tlf(struct sppp *sp); 298 static void sppp_lcp_scr(struct sppp *sp); 299 static void sppp_lcp_check_and_close(struct sppp *sp); 300 static int sppp_ncp_check(struct sppp *sp); 301 302 static void sppp_ipcp_init(struct sppp *sp); 303 static void sppp_ipcp_up(struct sppp *sp); 304 static void sppp_ipcp_down(struct sppp *sp); 305 static void sppp_ipcp_open(struct sppp *sp); 306 static void sppp_ipcp_close(struct sppp *sp); 307 static void sppp_ipcp_TO(void *sp); 308 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 309 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 310 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 311 static void sppp_ipcp_tlu(struct sppp *sp); 312 static void sppp_ipcp_tld(struct sppp *sp); 313 static void sppp_ipcp_tls(struct sppp *sp); 314 static void sppp_ipcp_tlf(struct sppp *sp); 315 static void sppp_ipcp_scr(struct sppp *sp); 316 317 static void sppp_ipv6cp_init(struct sppp *sp); 318 static void sppp_ipv6cp_up(struct sppp *sp); 319 static void sppp_ipv6cp_down(struct sppp *sp); 320 static void sppp_ipv6cp_open(struct sppp *sp); 321 static void sppp_ipv6cp_close(struct sppp *sp); 322 static void sppp_ipv6cp_TO(void *sp); 323 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 324 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 325 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 326 static void sppp_ipv6cp_tlu(struct sppp *sp); 327 static void sppp_ipv6cp_tld(struct sppp *sp); 328 static void sppp_ipv6cp_tls(struct sppp *sp); 329 static void sppp_ipv6cp_tlf(struct sppp *sp); 330 static void sppp_ipv6cp_scr(struct sppp *sp); 331 332 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 333 static void sppp_pap_init(struct sppp *sp); 334 static void sppp_pap_open(struct sppp *sp); 335 static void sppp_pap_close(struct sppp *sp); 336 static void sppp_pap_TO(void *sp); 337 static void sppp_pap_my_TO(void *sp); 338 static void sppp_pap_tlu(struct sppp *sp); 339 static void sppp_pap_tld(struct sppp *sp); 340 static void sppp_pap_scr(struct sppp *sp); 341 342 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 343 static void sppp_chap_init(struct sppp *sp); 344 static void sppp_chap_open(struct sppp *sp); 345 static void sppp_chap_close(struct sppp *sp); 346 static void sppp_chap_TO(void *sp); 347 static void sppp_chap_tlu(struct sppp *sp); 348 static void sppp_chap_tld(struct sppp *sp); 349 static void sppp_chap_scr(struct sppp *sp); 350 351 static const char *sppp_auth_type_name(u_short proto, u_char type); 352 static const char *sppp_cp_type_name(u_char type); 353 static const char *sppp_dotted_quad(u_int32_t addr); 354 static const char *sppp_ipcp_opt_name(u_char opt); 355 #ifdef INET6 356 static const char *sppp_ipv6cp_opt_name(u_char opt); 357 #endif 358 static const char *sppp_lcp_opt_name(u_char opt); 359 static const char *sppp_phase_name(enum ppp_phase phase); 360 static const char *sppp_proto_name(u_short proto); 361 static const char *sppp_state_name(int state); 362 static int sppp_params(struct sppp *sp, int cmd, void *data); 363 static int sppp_strnlen(u_char *p, int max); 364 static void sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, 365 u_int32_t *srcmask); 366 static void sppp_keepalive(void *dummy); 367 static void sppp_phase_network(struct sppp *sp); 368 static void sppp_print_bytes(const u_char *p, u_short len); 369 static void sppp_print_string(const char *p, u_short len); 370 static void sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr); 371 static void sppp_clear_ip_addrs(struct sppp *sp); 372 #ifdef INET6 373 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 374 struct in6_addr *dst, struct in6_addr *srcmask); 375 #ifdef IPV6CP_MYIFID_DYN 376 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 377 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 378 #endif 379 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 380 #endif 381 382 /* our control protocol descriptors */ 383 static const struct cp lcp = { 384 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 385 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 386 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 387 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 388 sppp_lcp_scr 389 }; 390 391 static const struct cp ipcp = { 392 PPP_IPCP, IDX_IPCP, 393 #ifdef INET 394 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 395 #else 396 0, 397 #endif 398 "ipcp", 399 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 400 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 401 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 402 sppp_ipcp_scr 403 }; 404 405 static const struct cp ipv6cp = { 406 PPP_IPV6CP, IDX_IPV6CP, 407 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 408 CP_NCP, 409 #else 410 0, 411 #endif 412 "ipv6cp", 413 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 414 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 415 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 416 sppp_ipv6cp_scr 417 }; 418 419 static const struct cp pap = { 420 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 421 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 422 sppp_pap_TO, 0, 0, 0, 423 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 424 sppp_pap_scr 425 }; 426 427 static const struct cp chap = { 428 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 429 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 430 sppp_chap_TO, 0, 0, 0, 431 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 432 sppp_chap_scr 433 }; 434 435 static const struct cp *cps[IDX_COUNT] = { 436 &lcp, /* IDX_LCP */ 437 &ipcp, /* IDX_IPCP */ 438 &ipv6cp, /* IDX_IPV6CP */ 439 &pap, /* IDX_PAP */ 440 &chap, /* IDX_CHAP */ 441 }; 442 443 444 /* 446 * Exported functions, comprising our interface to the lower layer. 447 */ 448 449 /* 450 * Process the received packet. 451 */ 452 void 453 sppp_input(struct ifnet *ifp, struct mbuf *m) 454 { 455 struct ppp_header *h = NULL; 456 struct ifqueue *inq = 0; 457 u_int16_t protocol; 458 int s; 459 struct sppp *sp = (struct sppp *)ifp; 460 int debug = ifp->if_flags & IFF_DEBUG; 461 462 if (ifp->if_flags & IFF_UP) 463 /* Count received bytes, add hardware framing */ 464 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 465 466 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 467 /* Too small packet, drop it. */ 468 if (debug) 469 log(LOG_DEBUG, 470 SPP_FMT "input packet is too small, %d bytes\n", 471 SPP_ARGS(ifp), m->m_pkthdr.len); 472 drop: 473 ++ifp->if_ierrors; 474 ++ifp->if_iqdrops; 475 m_freem (m); 476 return; 477 } 478 479 if (sp->pp_flags & PP_NOFRAMING) { 480 memcpy(&protocol, mtod(m, void *), 2); 481 protocol = ntohs(protocol); 482 m_adj(m, 2); 483 } else { 484 485 /* Get PPP header. */ 486 h = mtod (m, struct ppp_header*); 487 m_adj (m, PPP_HEADER_LEN); 488 489 switch (h->address) { 490 case PPP_ALLSTATIONS: 491 if (h->control != PPP_UI) 492 goto invalid; 493 if (sp->pp_flags & PP_CISCO) { 494 if (debug) 495 log(LOG_DEBUG, 496 SPP_FMT "PPP packet in Cisco mode " 497 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 498 SPP_ARGS(ifp), 499 h->address, h->control, ntohs(h->protocol)); 500 goto drop; 501 } 502 break; 503 case CISCO_MULTICAST: 504 case CISCO_UNICAST: 505 /* Don't check the control field here (RFC 1547). */ 506 if (! (sp->pp_flags & PP_CISCO)) { 507 if (debug) 508 log(LOG_DEBUG, 509 SPP_FMT "Cisco packet in PPP mode " 510 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 511 SPP_ARGS(ifp), 512 h->address, h->control, ntohs(h->protocol)); 513 goto drop; 514 } 515 switch (ntohs (h->protocol)) { 516 default: 517 ++ifp->if_noproto; 518 goto invalid; 519 case CISCO_KEEPALIVE: 520 sppp_cisco_input ((struct sppp*) ifp, m); 521 m_freem (m); 522 return; 523 #ifdef INET 524 case ETHERTYPE_IP: 525 schednetisr (NETISR_IP); 526 inq = &ipintrq; 527 break; 528 #endif 529 #ifdef INET6 530 case ETHERTYPE_IPV6: 531 schednetisr (NETISR_IPV6); 532 inq = &ip6intrq; 533 break; 534 #endif 535 #ifdef IPX 536 case ETHERTYPE_IPX: 537 schednetisr (NETISR_IPX); 538 inq = &ipxintrq; 539 break; 540 #endif 541 #ifdef NS 542 case ETHERTYPE_NS: 543 schednetisr (NETISR_NS); 544 inq = &nsintrq; 545 break; 546 #endif 547 } 548 goto queue_pkt; 549 default: /* Invalid PPP packet. */ 550 invalid: 551 if (debug) 552 log(LOG_DEBUG, 553 SPP_FMT "invalid input packet " 554 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 555 SPP_ARGS(ifp), 556 h->address, h->control, ntohs(h->protocol)); 557 goto drop; 558 } 559 protocol = ntohs (h->protocol); 560 } 561 562 switch (protocol) { 563 default: 564 if (sp->state[IDX_LCP] == STATE_OPENED) { 565 u_int16_t prot = htons(protocol); 566 sppp_cp_send (sp, PPP_LCP, PROTO_REJ, 567 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 568 &prot); 569 } 570 if (debug) 571 log(LOG_DEBUG, 572 SPP_FMT "invalid input protocol " 573 "<proto=0x%x>\n", SPP_ARGS(ifp), ntohs(protocol)); 574 ++ifp->if_noproto; 575 goto drop; 576 case PPP_LCP: 577 sppp_cp_input(&lcp, sp, m); 578 m_freem (m); 579 return; 580 case PPP_PAP: 581 if (sp->pp_phase >= PHASE_AUTHENTICATE) 582 sppp_pap_input(sp, m); 583 m_freem (m); 584 return; 585 case PPP_CHAP: 586 if (sp->pp_phase >= PHASE_AUTHENTICATE) 587 sppp_chap_input(sp, m); 588 m_freem (m); 589 return; 590 #ifdef INET 591 case PPP_IPCP: 592 if (sp->pp_phase == PHASE_NETWORK) 593 sppp_cp_input(&ipcp, sp, m); 594 m_freem (m); 595 return; 596 case PPP_IP: 597 if (sp->state[IDX_IPCP] == STATE_OPENED) { 598 schednetisr (NETISR_IP); 599 inq = &ipintrq; 600 } 601 break; 602 #endif 603 #ifdef INET6 604 case PPP_IPV6CP: 605 if (sp->pp_phase == PHASE_NETWORK) 606 sppp_cp_input(&ipv6cp, sp, m); 607 m_freem (m); 608 return; 609 610 case PPP_IPV6: 611 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 612 schednetisr (NETISR_IPV6); 613 inq = &ip6intrq; 614 } 615 break; 616 #endif 617 #ifdef IPX 618 case PPP_IPX: 619 /* IPX IPXCP not implemented yet */ 620 if (sp->pp_phase == PHASE_NETWORK) { 621 schednetisr (NETISR_IPX); 622 inq = &ipxintrq; 623 } 624 break; 625 #endif 626 #ifdef NS 627 case PPP_XNS: 628 /* XNS IDPCP not implemented yet */ 629 if (sp->pp_phase == PHASE_NETWORK) { 630 schednetisr (NETISR_NS); 631 inq = &nsintrq; 632 } 633 break; 634 #endif 635 #ifdef ISO 636 case PPP_ISO: 637 /* OSI NLCP not implemented yet */ 638 if (sp->pp_phase == PHASE_NETWORK) { 639 schednetisr (NETISR_ISO); 640 inq = &clnlintrq; 641 } 642 break; 643 #endif 644 } 645 646 queue_pkt: 647 if (! (ifp->if_flags & IFF_UP) || ! inq) 648 goto drop; 649 650 /* Check queue. */ 651 s = splnet(); 652 if (IF_QFULL (inq)) { 653 /* Queue overflow. */ 654 IF_DROP(inq); 655 splx(s); 656 if (debug) 657 log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n", 658 SPP_ARGS(ifp)); 659 goto drop; 660 } 661 IF_ENQUEUE(inq, m); 662 splx(s); 663 } 664 665 /* 666 * Enqueue transmit packet. 667 */ 668 static int 669 sppp_output(struct ifnet *ifp, struct mbuf *m, 670 struct sockaddr *dst, struct rtentry *rt) 671 { 672 struct sppp *sp = (struct sppp*) ifp; 673 struct ppp_header *h = NULL; 674 struct ifqueue *ifq = NULL; /* XXX */ 675 int s, len, rv = 0; 676 u_int16_t protocol; 677 ALTQ_DECL(struct altq_pktattr pktattr;) 678 679 s = splnet(); 680 681 if ((ifp->if_flags & IFF_UP) == 0 || 682 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 683 m_freem (m); 684 splx (s); 685 return (ENETDOWN); 686 } 687 688 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 689 /* 690 * Interface is not yet running, but auto-dial. Need 691 * to start LCP for it. 692 */ 693 ifp->if_flags |= IFF_RUNNING; 694 splx(s); 695 lcp.Open(sp); 696 s = splnet(); 697 } 698 699 /* 700 * If the queueing discipline needs packet classification, 701 * do it before prepending link headers. 702 */ 703 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 704 705 #ifdef INET 706 if (dst->sa_family == AF_INET) 707 { 708 /* Check mbuf length here??? */ 709 struct ip *ip = mtod (m, struct ip*); 710 struct tcphdr *tcp = (struct tcphdr*) ((int32_t*)ip + ip->ip_hl); 711 712 /* 713 * When using dynamic local IP address assignment by using 714 * 0.0.0.0 as a local address, the first TCP session will 715 * not connect because the local TCP checksum is computed 716 * using 0.0.0.0 which will later become our real IP address 717 * so the TCP checksum computed at the remote end will 718 * become invalid. So we 719 * - don't let packets with src ip addr 0 thru 720 * - we flag TCP packets with src ip 0 as an error 721 */ 722 723 if(ip->ip_src.s_addr == INADDR_ANY) /* -hm */ 724 { 725 m_freem(m); 726 splx(s); 727 if(ip->ip_p == IPPROTO_TCP) 728 return(EADDRNOTAVAIL); 729 else 730 return(0); 731 } 732 733 /* 734 * Put low delay, telnet, rlogin and ftp control packets 735 * in front of the queue. 736 */ 737 738 if (! IF_QFULL (&sp->pp_fastq) && 739 ((ip->ip_tos & IPTOS_LOWDELAY) || 740 ((ip->ip_p == IPPROTO_TCP && 741 m->m_len >= sizeof (struct ip) + sizeof (struct tcphdr) && 742 (INTERACTIVE (ntohs (tcp->th_sport)))) || 743 INTERACTIVE (ntohs (tcp->th_dport))))) 744 ifq = &sp->pp_fastq; 745 } 746 #endif 747 748 #ifdef INET6 749 if (dst->sa_family == AF_INET6) { 750 /* XXX do something tricky here? */ 751 } 752 #endif 753 754 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 755 /* 756 * Prepend general data packet PPP header. For now, IP only. 757 */ 758 M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT); 759 if (! m) { 760 if (ifp->if_flags & IFF_DEBUG) 761 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n", 762 SPP_ARGS(ifp)); 763 ++ifp->if_oerrors; 764 splx (s); 765 return (ENOBUFS); 766 } 767 /* 768 * May want to check size of packet 769 * (albeit due to the implementation it's always enough) 770 */ 771 h = mtod (m, struct ppp_header*); 772 if (sp->pp_flags & PP_CISCO) { 773 h->address = CISCO_UNICAST; /* unicast address */ 774 h->control = 0; 775 } else { 776 h->address = PPP_ALLSTATIONS; /* broadcast address */ 777 h->control = PPP_UI; /* Unnumbered Info */ 778 } 779 } 780 781 switch (dst->sa_family) { 782 #ifdef INET 783 case AF_INET: /* Internet Protocol */ 784 if (sp->pp_flags & PP_CISCO) 785 protocol = htons (ETHERTYPE_IP); 786 else { 787 /* 788 * Don't choke with an ENETDOWN early. It's 789 * possible that we just started dialing out, 790 * so don't drop the packet immediately. If 791 * we notice that we run out of buffer space 792 * below, we will however remember that we are 793 * not ready to carry IP packets, and return 794 * ENETDOWN, as opposed to ENOBUFS. 795 */ 796 protocol = htons(PPP_IP); 797 if (sp->state[IDX_IPCP] != STATE_OPENED) 798 rv = ENETDOWN; 799 } 800 break; 801 #endif 802 #ifdef INET6 803 case AF_INET6: /* Internet Protocol version 6 */ 804 if (sp->pp_flags & PP_CISCO) 805 protocol = htons (ETHERTYPE_IPV6); 806 else { 807 /* 808 * Don't choke with an ENETDOWN early. It's 809 * possible that we just started dialing out, 810 * so don't drop the packet immediately. If 811 * we notice that we run out of buffer space 812 * below, we will however remember that we are 813 * not ready to carry IP packets, and return 814 * ENETDOWN, as opposed to ENOBUFS. 815 */ 816 protocol = htons(PPP_IPV6); 817 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 818 rv = ENETDOWN; 819 } 820 break; 821 #endif 822 #ifdef NS 823 case AF_NS: /* Xerox NS Protocol */ 824 protocol = htons ((sp->pp_flags & PP_CISCO) ? 825 ETHERTYPE_NS : PPP_XNS); 826 break; 827 #endif 828 #ifdef IPX 829 case AF_IPX: /* Novell IPX Protocol */ 830 protocol = htons ((sp->pp_flags & PP_CISCO) ? 831 ETHERTYPE_IPX : PPP_IPX); 832 break; 833 #endif 834 #ifdef ISO 835 case AF_ISO: /* ISO OSI Protocol */ 836 if (sp->pp_flags & PP_CISCO) 837 goto nosupport; 838 protocol = htons (PPP_ISO); 839 break; 840 nosupport: 841 #endif 842 default: 843 m_freem (m); 844 ++ifp->if_oerrors; 845 splx (s); 846 return (EAFNOSUPPORT); 847 } 848 849 if (sp->pp_flags & PP_NOFRAMING) { 850 M_PREPEND (m, 2, M_DONTWAIT); 851 if (m == NULL) { 852 if (ifp->if_flags & IFF_DEBUG) 853 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n", 854 SPP_ARGS(ifp)); 855 ++ifp->if_oerrors; 856 splx (s); 857 return (ENOBUFS); 858 } 859 *mtod(m, u_int16_t*) = protocol; 860 } else { 861 h->protocol = protocol; 862 } 863 864 /* 865 * Queue message on interface, and start output if interface 866 * not yet active. 867 */ 868 len = m->m_pkthdr.len; 869 if (ifq != NULL 870 #ifdef ALTQ 871 && ALTQ_IS_ENABLED(&ifp->if_snd) == 0 872 #endif 873 ) { 874 if (IF_QFULL (ifq)) { 875 IF_DROP (&ifp->if_snd); 876 m_freem (m); 877 if (rv == 0) 878 rv = ENOBUFS; 879 } 880 IF_ENQUEUE(ifq, m); 881 } else 882 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, rv); 883 if (rv != 0) { 884 ++ifp->if_oerrors; 885 splx(s); 886 return (rv); 887 } 888 889 if (! (ifp->if_flags & IFF_OACTIVE)) 890 (*ifp->if_start) (ifp); 891 892 /* 893 * Count output packets and bytes. 894 * The packet length includes header + additional hardware framing 895 * according to RFC 1333. 896 */ 897 ifp->if_obytes += len + sp->pp_framebytes; 898 splx (s); 899 return (0); 900 } 901 902 void 903 sppp_attach(struct ifnet *ifp) 904 { 905 struct sppp *sp = (struct sppp*) ifp; 906 907 /* Initialize keepalive handler. */ 908 if (! spppq) { 909 callout_init(&keepalive_ch); 910 callout_reset(&keepalive_ch, hz * 10, sppp_keepalive, NULL); 911 } 912 913 /* Insert new entry into the keepalive list. */ 914 sp->pp_next = spppq; 915 spppq = sp; 916 917 sp->pp_if.if_type = IFT_PPP; 918 sp->pp_if.if_output = sppp_output; 919 sp->pp_fastq.ifq_maxlen = 32; 920 sp->pp_cpq.ifq_maxlen = 20; 921 sp->pp_loopcnt = 0; 922 sp->pp_alivecnt = 0; 923 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 924 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 925 sp->pp_phase = PHASE_DEAD; 926 sp->pp_up = lcp.Up; 927 sp->pp_down = lcp.Down; 928 929 if_alloc_sadl(ifp); 930 931 sppp_lcp_init(sp); 932 sppp_ipcp_init(sp); 933 sppp_ipv6cp_init(sp); 934 sppp_pap_init(sp); 935 sppp_chap_init(sp); 936 } 937 938 void 939 sppp_detach(struct ifnet *ifp) 940 { 941 struct sppp **q, *p, *sp = (struct sppp*) ifp; 942 int i; 943 944 /* Remove the entry from the keepalive list. */ 945 for (q = &spppq; (p = *q); q = &p->pp_next) 946 if (p == sp) { 947 *q = p->pp_next; 948 break; 949 } 950 951 /* Stop keepalive handler. */ 952 if (! spppq) { 953 callout_stop(&keepalive_ch); 954 } 955 956 for (i = 0; i < IDX_COUNT; i++) { 957 callout_stop(&sp->ch[i]); 958 } 959 callout_stop(&sp->pap_my_to_ch); 960 961 if_free_sadl(ifp); 962 } 963 964 /* 965 * Flush the interface output queue. 966 */ 967 void 968 sppp_flush(struct ifnet *ifp) 969 { 970 struct sppp *sp = (struct sppp*) ifp; 971 972 IFQ_PURGE (&sp->pp_if.if_snd); 973 IF_PURGE (&sp->pp_fastq); 974 IF_PURGE (&sp->pp_cpq); 975 } 976 977 /* 978 * Check if the output queue is empty. 979 */ 980 int 981 sppp_isempty(struct ifnet *ifp) 982 { 983 struct sppp *sp = (struct sppp*) ifp; 984 int empty, s; 985 986 s = splnet(); 987 empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head && 988 !sp->pp_if.if_snd.ifq_head; 989 splx(s); 990 return (empty); 991 } 992 993 /* 994 * Get next packet to send. 995 */ 996 struct mbuf * 997 sppp_dequeue(struct ifnet *ifp) 998 { 999 struct sppp *sp = (struct sppp*) ifp; 1000 struct mbuf *m; 1001 int s; 1002 1003 s = splnet(); 1004 /* 1005 * Process only the control protocol queue until we have at 1006 * least one NCP open. 1007 * 1008 * Do always serve all three queues in Cisco mode. 1009 */ 1010 IF_DEQUEUE(&sp->pp_cpq, m); 1011 if (m == NULL && 1012 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1013 IF_DEQUEUE(&sp->pp_fastq, m); 1014 if (m == NULL) 1015 IF_DEQUEUE (&sp->pp_if.if_snd, m); 1016 } 1017 splx(s); 1018 return m; 1019 } 1020 1021 /* 1022 * Pick the next packet, do not remove it from the queue. 1023 */ 1024 struct mbuf * 1025 sppp_pick(struct ifnet *ifp) 1026 { 1027 struct sppp *sp = (struct sppp*)ifp; 1028 struct mbuf *m; 1029 int s; 1030 1031 s= splnet (); 1032 1033 m = sp->pp_cpq.ifq_head; 1034 if (m == NULL && 1035 (sp->pp_phase == PHASE_NETWORK || 1036 (sp->pp_flags & PP_CISCO) != 0)) 1037 if ((m = sp->pp_fastq.ifq_head) == NULL) 1038 m = sp->pp_if.if_snd.ifq_head; 1039 splx (s); 1040 return (m); 1041 } 1042 1043 /* 1044 * Process an ioctl request. Called on low priority level. 1045 */ 1046 int 1047 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1048 { 1049 struct ifreq *ifr = (struct ifreq*) data; 1050 struct sppp *sp = (struct sppp*) ifp; 1051 int s, rv, going_up, going_down, newmode; 1052 1053 s = splnet(); 1054 rv = 0; 1055 switch (cmd) { 1056 case SIOCAIFADDR: 1057 case SIOCSIFDSTADDR: 1058 break; 1059 1060 case SIOCSIFADDR: 1061 if_up(ifp); 1062 /* fall through... */ 1063 1064 case SIOCSIFFLAGS: 1065 going_up = ifp->if_flags & IFF_UP && 1066 (ifp->if_flags & IFF_RUNNING) == 0; 1067 going_down = (ifp->if_flags & IFF_UP) == 0 && 1068 ifp->if_flags & IFF_RUNNING; 1069 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1070 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1071 /* sanity */ 1072 newmode = IFF_PASSIVE; 1073 ifp->if_flags &= ~IFF_AUTO; 1074 } 1075 1076 if (going_up || going_down) 1077 lcp.Close(sp); 1078 if (going_up && newmode == 0) { 1079 /* neither auto-dial nor passive */ 1080 ifp->if_flags |= IFF_RUNNING; 1081 if (!(sp->pp_flags & PP_CISCO)) 1082 lcp.Open(sp); 1083 } else if (going_down) { 1084 sppp_flush(ifp); 1085 ifp->if_flags &= ~IFF_RUNNING; 1086 } 1087 1088 break; 1089 1090 #ifdef SIOCSIFMTU 1091 #ifndef ifr_mtu 1092 #define ifr_mtu ifr_metric 1093 #endif 1094 case SIOCSIFMTU: 1095 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) 1096 return (EINVAL); 1097 ifp->if_mtu = ifr->ifr_mtu; 1098 break; 1099 #endif 1100 #ifdef SLIOCSETMTU 1101 case SLIOCSETMTU: 1102 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru) 1103 return (EINVAL); 1104 ifp->if_mtu = *(short*)data; 1105 break; 1106 #endif 1107 #ifdef SIOCGIFMTU 1108 case SIOCGIFMTU: 1109 ifr->ifr_mtu = ifp->if_mtu; 1110 break; 1111 #endif 1112 #ifdef SLIOCGETMTU 1113 case SLIOCGETMTU: 1114 *(short*)data = ifp->if_mtu; 1115 break; 1116 #endif 1117 case SIOCADDMULTI: 1118 case SIOCDELMULTI: 1119 break; 1120 1121 case SIOCGIFGENERIC: 1122 case SIOCSIFGENERIC: 1123 rv = sppp_params(sp, cmd, data); 1124 break; 1125 1126 default: 1127 rv = ENOTTY; 1128 } 1129 splx(s); 1130 return rv; 1131 } 1132 1133 1134 /* 1136 * Cisco framing implementation. 1137 */ 1138 1139 /* 1140 * Handle incoming Cisco keepalive protocol packets. 1141 */ 1142 static void 1143 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1144 { 1145 STDDCL; 1146 struct cisco_packet *h; 1147 u_int32_t me, mymask; 1148 1149 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1150 if (debug) 1151 log(LOG_DEBUG, 1152 SPP_FMT "cisco invalid packet length: %d bytes\n", 1153 SPP_ARGS(ifp), m->m_pkthdr.len); 1154 return; 1155 } 1156 h = mtod (m, struct cisco_packet*); 1157 if (debug) 1158 log(LOG_DEBUG, 1159 SPP_FMT "cisco input: %d bytes " 1160 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1161 SPP_ARGS(ifp), m->m_pkthdr.len, 1162 ntohl (h->type), h->par1, h->par2, (u_int)h->rel, 1163 (u_int)h->time0, (u_int)h->time1); 1164 switch (ntohl (h->type)) { 1165 default: 1166 if (debug) 1167 addlog(SPP_FMT "cisco unknown packet type: 0x%x\n", 1168 SPP_ARGS(ifp), ntohl (h->type)); 1169 break; 1170 case CISCO_ADDR_REPLY: 1171 /* Reply on address request, ignore */ 1172 break; 1173 case CISCO_KEEPALIVE_REQ: 1174 sp->pp_alivecnt = 0; 1175 sp->pp_rseq[IDX_LCP] = ntohl (h->par1); 1176 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1177 /* Local and remote sequence numbers are equal. 1178 * Probably, the line is in loopback mode. */ 1179 if (sp->pp_loopcnt >= MAXALIVECNT) { 1180 printf (SPP_FMT "loopback\n", 1181 SPP_ARGS(ifp)); 1182 sp->pp_loopcnt = 0; 1183 if (ifp->if_flags & IFF_UP) { 1184 if_down (ifp); 1185 IF_PURGE (&sp->pp_cpq); 1186 } 1187 } 1188 ++sp->pp_loopcnt; 1189 1190 /* Generate new local sequence number */ 1191 sp->pp_seq[IDX_LCP] = random(); 1192 break; 1193 } 1194 sp->pp_loopcnt = 0; 1195 if (! (ifp->if_flags & IFF_UP) && 1196 (ifp->if_flags & IFF_RUNNING)) { 1197 if_up(ifp); 1198 printf (SPP_FMT "up\n", SPP_ARGS(ifp)); 1199 } 1200 break; 1201 case CISCO_ADDR_REQ: 1202 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1203 if (me != 0L) 1204 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1205 break; 1206 } 1207 } 1208 1209 /* 1210 * Send Cisco keepalive packet. 1211 */ 1212 static void 1213 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1214 { 1215 STDDCL; 1216 struct ppp_header *h; 1217 struct cisco_packet *ch; 1218 struct mbuf *m; 1219 u_int32_t t = (time.tv_sec - boottime.tv_sec) * 1000; 1220 1221 MGETHDR (m, M_DONTWAIT, MT_DATA); 1222 if (! m) 1223 return; 1224 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1225 m->m_pkthdr.rcvif = 0; 1226 1227 h = mtod (m, struct ppp_header*); 1228 h->address = CISCO_MULTICAST; 1229 h->control = 0; 1230 h->protocol = htons (CISCO_KEEPALIVE); 1231 1232 ch = (struct cisco_packet*) (h + 1); 1233 ch->type = htonl (type); 1234 ch->par1 = htonl (par1); 1235 ch->par2 = htonl (par2); 1236 ch->rel = -1; 1237 1238 ch->time0 = htons ((u_short) (t >> 16)); 1239 ch->time1 = htons ((u_short) t); 1240 1241 if (debug) 1242 log(LOG_DEBUG, 1243 SPP_FMT "cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1244 SPP_ARGS(ifp), ntohl (ch->type), ch->par1, 1245 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1246 (u_int)ch->time1); 1247 1248 if (IF_QFULL (&sp->pp_cpq)) { 1249 IF_DROP (&sp->pp_fastq); 1250 IF_DROP (&ifp->if_snd); 1251 m_freem (m); 1252 } else 1253 IF_ENQUEUE (&sp->pp_cpq, m); 1254 if (! (ifp->if_flags & IFF_OACTIVE)) 1255 (*ifp->if_start) (ifp); 1256 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1257 } 1258 1259 /* 1261 * PPP protocol implementation. 1262 */ 1263 1264 /* 1265 * Send PPP control protocol packet. 1266 */ 1267 static void 1268 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1269 u_char ident, u_short len, void *data) 1270 { 1271 STDDCL; 1272 struct lcp_header *lh; 1273 struct mbuf *m; 1274 size_t pkthdrlen; 1275 1276 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1277 1278 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1279 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1280 MGETHDR (m, M_DONTWAIT, MT_DATA); 1281 if (! m) 1282 return; 1283 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1284 m->m_pkthdr.rcvif = 0; 1285 1286 if (sp->pp_flags & PP_NOFRAMING) { 1287 *mtod(m, u_int16_t*) = htons(proto); 1288 lh = (struct lcp_header*)(mtod(m, u_int8_t*) + 2); 1289 } else { 1290 struct ppp_header *h; 1291 h = mtod (m, struct ppp_header*); 1292 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1293 h->control = PPP_UI; /* Unnumbered Info */ 1294 h->protocol = htons (proto); /* Link Control Protocol */ 1295 lh = (struct lcp_header*) (h + 1); 1296 } 1297 lh->type = type; 1298 lh->ident = ident; 1299 lh->len = htons (LCP_HEADER_LEN + len); 1300 if (len) 1301 bcopy (data, lh+1, len); 1302 1303 if (debug) { 1304 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 1305 SPP_ARGS(ifp), 1306 sppp_proto_name(proto), 1307 sppp_cp_type_name (lh->type), lh->ident, 1308 ntohs (lh->len)); 1309 if (len) 1310 sppp_print_bytes ((u_char*) (lh+1), len); 1311 addlog(">\n"); 1312 } 1313 if (IF_QFULL (&sp->pp_cpq)) { 1314 IF_DROP (&sp->pp_fastq); 1315 IF_DROP (&ifp->if_snd); 1316 m_freem (m); 1317 ++ifp->if_oerrors; 1318 } else 1319 IF_ENQUEUE (&sp->pp_cpq, m); 1320 if (! (ifp->if_flags & IFF_OACTIVE)) 1321 (*ifp->if_start) (ifp); 1322 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1323 } 1324 1325 /* 1326 * Handle incoming PPP control protocol packets. 1327 */ 1328 static void 1329 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1330 { 1331 STDDCL; 1332 struct lcp_header *h; 1333 int len = m->m_pkthdr.len; 1334 int rv; 1335 u_char *p; 1336 u_int32_t u32; 1337 1338 if (len < 4) { 1339 if (debug) 1340 log(LOG_DEBUG, 1341 SPP_FMT "%s invalid packet length: %d bytes\n", 1342 SPP_ARGS(ifp), cp->name, len); 1343 return; 1344 } 1345 h = mtod (m, struct lcp_header*); 1346 if (debug) { 1347 log(LOG_DEBUG, 1348 SPP_FMT "%s input(%s): <%s id=0x%x len=%d", 1349 SPP_ARGS(ifp), cp->name, 1350 sppp_state_name(sp->state[cp->protoidx]), 1351 sppp_cp_type_name (h->type), h->ident, ntohs (h->len)); 1352 if (len > 4) 1353 sppp_print_bytes ((u_char*) (h+1), len-4); 1354 addlog(">\n"); 1355 } 1356 if (len > ntohs (h->len)) 1357 len = ntohs (h->len); 1358 p = (u_char *)(h + 1); 1359 switch (h->type) { 1360 case CONF_REQ: 1361 if (len < 4) { 1362 if (debug) 1363 addlog(SPP_FMT "%s invalid conf-req length %d\n", 1364 SPP_ARGS(ifp), cp->name, 1365 len); 1366 ++ifp->if_ierrors; 1367 break; 1368 } 1369 /* handle states where RCR doesn't get a SCA/SCN */ 1370 switch (sp->state[cp->protoidx]) { 1371 case STATE_CLOSING: 1372 case STATE_STOPPING: 1373 return; 1374 case STATE_CLOSED: 1375 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1376 0, 0); 1377 return; 1378 } 1379 rv = (cp->RCR)(sp, h, len); 1380 switch (sp->state[cp->protoidx]) { 1381 case STATE_OPENED: 1382 (cp->tld)(sp); 1383 (cp->scr)(sp); 1384 /* fall through... */ 1385 case STATE_ACK_SENT: 1386 case STATE_REQ_SENT: 1387 sppp_cp_change_state(cp, sp, rv? 1388 STATE_ACK_SENT: STATE_REQ_SENT); 1389 break; 1390 case STATE_STOPPED: 1391 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1392 (cp->scr)(sp); 1393 sppp_cp_change_state(cp, sp, rv? 1394 STATE_ACK_SENT: STATE_REQ_SENT); 1395 break; 1396 case STATE_ACK_RCVD: 1397 if (rv) { 1398 sppp_cp_change_state(cp, sp, STATE_OPENED); 1399 if (debug) 1400 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1401 SPP_ARGS(ifp), 1402 cp->name); 1403 (cp->tlu)(sp); 1404 } else 1405 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1406 break; 1407 default: 1408 printf(SPP_FMT "%s illegal %s in state %s\n", 1409 SPP_ARGS(ifp), cp->name, 1410 sppp_cp_type_name(h->type), 1411 sppp_state_name(sp->state[cp->protoidx])); 1412 ++ifp->if_ierrors; 1413 } 1414 break; 1415 case CONF_ACK: 1416 if (h->ident != sp->confid[cp->protoidx]) { 1417 if (debug) 1418 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1419 SPP_ARGS(ifp), cp->name, 1420 h->ident, sp->confid[cp->protoidx]); 1421 ++ifp->if_ierrors; 1422 break; 1423 } 1424 switch (sp->state[cp->protoidx]) { 1425 case STATE_CLOSED: 1426 case STATE_STOPPED: 1427 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1428 break; 1429 case STATE_CLOSING: 1430 case STATE_STOPPING: 1431 break; 1432 case STATE_REQ_SENT: 1433 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1434 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1435 break; 1436 case STATE_OPENED: 1437 (cp->tld)(sp); 1438 /* fall through */ 1439 case STATE_ACK_RCVD: 1440 (cp->scr)(sp); 1441 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1442 break; 1443 case STATE_ACK_SENT: 1444 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1445 sppp_cp_change_state(cp, sp, STATE_OPENED); 1446 if (debug) 1447 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1448 SPP_ARGS(ifp), cp->name); 1449 (cp->tlu)(sp); 1450 break; 1451 default: 1452 printf(SPP_FMT "%s illegal %s in state %s\n", 1453 SPP_ARGS(ifp), cp->name, 1454 sppp_cp_type_name(h->type), 1455 sppp_state_name(sp->state[cp->protoidx])); 1456 ++ifp->if_ierrors; 1457 } 1458 break; 1459 case CONF_NAK: 1460 case CONF_REJ: 1461 if (h->ident != sp->confid[cp->protoidx]) { 1462 if (debug) 1463 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1464 SPP_ARGS(ifp), cp->name, 1465 h->ident, sp->confid[cp->protoidx]); 1466 ++ifp->if_ierrors; 1467 break; 1468 } 1469 if (h->type == CONF_NAK) 1470 (cp->RCN_nak)(sp, h, len); 1471 else /* CONF_REJ */ 1472 (cp->RCN_rej)(sp, h, len); 1473 1474 switch (sp->state[cp->protoidx]) { 1475 case STATE_CLOSED: 1476 case STATE_STOPPED: 1477 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1478 break; 1479 case STATE_REQ_SENT: 1480 case STATE_ACK_SENT: 1481 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1482 (cp->scr)(sp); 1483 break; 1484 case STATE_OPENED: 1485 (cp->tld)(sp); 1486 /* fall through */ 1487 case STATE_ACK_RCVD: 1488 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1489 (cp->scr)(sp); 1490 break; 1491 case STATE_CLOSING: 1492 case STATE_STOPPING: 1493 break; 1494 default: 1495 printf(SPP_FMT "%s illegal %s in state %s\n", 1496 SPP_ARGS(ifp), cp->name, 1497 sppp_cp_type_name(h->type), 1498 sppp_state_name(sp->state[cp->protoidx])); 1499 ++ifp->if_ierrors; 1500 } 1501 break; 1502 1503 case TERM_REQ: 1504 switch (sp->state[cp->protoidx]) { 1505 case STATE_ACK_RCVD: 1506 case STATE_ACK_SENT: 1507 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1508 /* fall through */ 1509 case STATE_CLOSED: 1510 case STATE_STOPPED: 1511 case STATE_CLOSING: 1512 case STATE_STOPPING: 1513 case STATE_REQ_SENT: 1514 sta: 1515 /* Send Terminate-Ack packet. */ 1516 if (debug) 1517 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n", 1518 SPP_ARGS(ifp), cp->name); 1519 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1520 break; 1521 case STATE_OPENED: 1522 (cp->tld)(sp); 1523 sp->rst_counter[cp->protoidx] = 0; 1524 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1525 goto sta; 1526 break; 1527 default: 1528 printf(SPP_FMT "%s illegal %s in state %s\n", 1529 SPP_ARGS(ifp), cp->name, 1530 sppp_cp_type_name(h->type), 1531 sppp_state_name(sp->state[cp->protoidx])); 1532 ++ifp->if_ierrors; 1533 } 1534 break; 1535 case TERM_ACK: 1536 switch (sp->state[cp->protoidx]) { 1537 case STATE_CLOSED: 1538 case STATE_STOPPED: 1539 case STATE_REQ_SENT: 1540 case STATE_ACK_SENT: 1541 break; 1542 case STATE_CLOSING: 1543 (cp->tlf)(sp); 1544 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1545 sppp_lcp_check_and_close(sp); 1546 break; 1547 case STATE_STOPPING: 1548 (cp->tlf)(sp); 1549 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1550 sppp_lcp_check_and_close(sp); 1551 break; 1552 case STATE_ACK_RCVD: 1553 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1554 break; 1555 case STATE_OPENED: 1556 (cp->tld)(sp); 1557 (cp->scr)(sp); 1558 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1559 break; 1560 default: 1561 printf(SPP_FMT "%s illegal %s in state %s\n", 1562 SPP_ARGS(ifp), cp->name, 1563 sppp_cp_type_name(h->type), 1564 sppp_state_name(sp->state[cp->protoidx])); 1565 ++ifp->if_ierrors; 1566 } 1567 break; 1568 case CODE_REJ: 1569 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1570 log(LOG_INFO, 1571 SPP_FMT "%s: ignoring RXJ (%s) for code ?, " 1572 "danger will robinson\n", 1573 SPP_ARGS(ifp), cp->name, 1574 sppp_cp_type_name(h->type)); 1575 switch (sp->state[cp->protoidx]) { 1576 case STATE_CLOSED: 1577 case STATE_STOPPED: 1578 case STATE_REQ_SENT: 1579 case STATE_ACK_SENT: 1580 case STATE_CLOSING: 1581 case STATE_STOPPING: 1582 case STATE_OPENED: 1583 break; 1584 case STATE_ACK_RCVD: 1585 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1586 break; 1587 default: 1588 printf(SPP_FMT "%s illegal %s in state %s\n", 1589 SPP_ARGS(ifp), cp->name, 1590 sppp_cp_type_name(h->type), 1591 sppp_state_name(sp->state[cp->protoidx])); 1592 ++ifp->if_ierrors; 1593 } 1594 break; 1595 case PROTO_REJ: 1596 { 1597 int catastrophic; 1598 const struct cp *upper; 1599 int i; 1600 u_int16_t proto; 1601 1602 catastrophic = 0; 1603 upper = NULL; 1604 proto = p[0] << 8 | p[1]; 1605 for (i = 0; i < IDX_COUNT; i++) { 1606 if (cps[i]->proto == proto) { 1607 upper = cps[i]; 1608 break; 1609 } 1610 } 1611 if (upper == NULL) 1612 catastrophic++; 1613 1614 log(LOG_INFO, 1615 SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1616 SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+', 1617 sppp_cp_type_name(h->type), proto, 1618 upper ? upper->name : "unknown", 1619 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1620 1621 /* 1622 * if we got RXJ+ against conf-req, the peer does not implement 1623 * this particular protocol type. terminate the protocol. 1624 */ 1625 if (upper && !catastrophic) { 1626 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1627 upper->Close(sp); 1628 break; 1629 } 1630 } 1631 1632 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1633 switch (sp->state[cp->protoidx]) { 1634 case STATE_CLOSED: 1635 case STATE_STOPPED: 1636 case STATE_REQ_SENT: 1637 case STATE_ACK_SENT: 1638 case STATE_CLOSING: 1639 case STATE_STOPPING: 1640 case STATE_OPENED: 1641 break; 1642 case STATE_ACK_RCVD: 1643 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1644 break; 1645 default: 1646 printf(SPP_FMT "%s illegal %s in state %s\n", 1647 SPP_ARGS(ifp), cp->name, 1648 sppp_cp_type_name(h->type), 1649 sppp_state_name(sp->state[cp->protoidx])); 1650 ++ifp->if_ierrors; 1651 } 1652 break; 1653 } 1654 case DISC_REQ: 1655 if (cp->proto != PPP_LCP) 1656 goto illegal; 1657 /* Discard the packet. */ 1658 break; 1659 case ECHO_REQ: 1660 if (cp->proto != PPP_LCP) 1661 goto illegal; 1662 if (sp->state[cp->protoidx] != STATE_OPENED) { 1663 if (debug) 1664 addlog(SPP_FMT "lcp echo req but lcp closed\n", 1665 SPP_ARGS(ifp)); 1666 ++ifp->if_ierrors; 1667 break; 1668 } 1669 if (len < 8) { 1670 if (debug) 1671 addlog(SPP_FMT "invalid lcp echo request " 1672 "packet length: %d bytes\n", 1673 SPP_ARGS(ifp), len); 1674 break; 1675 } 1676 memcpy(&u32, h + 1, sizeof u32); 1677 if (ntohl(u32) == sp->lcp.magic) { 1678 /* Line loopback mode detected. */ 1679 printf(SPP_FMT "loopback\n", SPP_ARGS(ifp)); 1680 if_down (ifp); 1681 IF_PURGE (&sp->pp_cpq); 1682 1683 /* Shut down the PPP link. */ 1684 /* XXX */ 1685 lcp.Down(sp); 1686 lcp.Up(sp); 1687 break; 1688 } 1689 u32 = htonl(sp->lcp.magic); 1690 memcpy(h + 1, &u32, sizeof u32); 1691 if (debug) 1692 addlog(SPP_FMT "got lcp echo req, sending echo rep\n", 1693 SPP_ARGS(ifp)); 1694 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1); 1695 break; 1696 case ECHO_REPLY: 1697 if (cp->proto != PPP_LCP) 1698 goto illegal; 1699 if (h->ident != sp->lcp.echoid) { 1700 ++ifp->if_ierrors; 1701 break; 1702 } 1703 if (len < 8) { 1704 if (debug) 1705 addlog(SPP_FMT "lcp invalid echo reply " 1706 "packet length: %d bytes\n", 1707 SPP_ARGS(ifp), len); 1708 break; 1709 } 1710 if (debug) 1711 addlog(SPP_FMT "lcp got echo rep\n", 1712 SPP_ARGS(ifp)); 1713 memcpy(&u32, h + 1, sizeof u32); 1714 if (ntohl(u32) != sp->lcp.magic) 1715 sp->pp_alivecnt = 0; 1716 break; 1717 default: 1718 /* Unknown packet type -- send Code-Reject packet. */ 1719 illegal: 1720 if (debug) 1721 addlog(SPP_FMT "%s send code-rej for 0x%x\n", 1722 SPP_ARGS(ifp), cp->name, h->type); 1723 sppp_cp_send(sp, cp->proto, CODE_REJ, 1724 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1725 ++ifp->if_ierrors; 1726 } 1727 } 1728 1729 1730 /* 1731 * The generic part of all Up/Down/Open/Close/TO event handlers. 1732 * Basically, the state transition handling in the automaton. 1733 */ 1734 static void 1735 sppp_up_event(const struct cp *cp, struct sppp *sp) 1736 { 1737 STDDCL; 1738 1739 if (debug) 1740 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n", 1741 SPP_ARGS(ifp), cp->name, 1742 sppp_state_name(sp->state[cp->protoidx])); 1743 1744 switch (sp->state[cp->protoidx]) { 1745 case STATE_INITIAL: 1746 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1747 break; 1748 case STATE_STARTING: 1749 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1750 (cp->scr)(sp); 1751 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1752 break; 1753 default: 1754 printf(SPP_FMT "%s illegal up in state %s\n", 1755 SPP_ARGS(ifp), cp->name, 1756 sppp_state_name(sp->state[cp->protoidx])); 1757 } 1758 } 1759 1760 static void 1761 sppp_down_event(const struct cp *cp, struct sppp *sp) 1762 { 1763 STDDCL; 1764 1765 if (debug) 1766 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n", 1767 SPP_ARGS(ifp), cp->name, 1768 sppp_state_name(sp->state[cp->protoidx])); 1769 1770 switch (sp->state[cp->protoidx]) { 1771 case STATE_CLOSED: 1772 case STATE_CLOSING: 1773 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1774 break; 1775 case STATE_STOPPED: 1776 (cp->tls)(sp); 1777 /* fall through */ 1778 case STATE_STOPPING: 1779 case STATE_REQ_SENT: 1780 case STATE_ACK_RCVD: 1781 case STATE_ACK_SENT: 1782 sppp_cp_change_state(cp, sp, STATE_STARTING); 1783 break; 1784 case STATE_OPENED: 1785 (cp->tld)(sp); 1786 sppp_cp_change_state(cp, sp, STATE_STARTING); 1787 break; 1788 default: 1789 printf(SPP_FMT "%s illegal down in state %s\n", 1790 SPP_ARGS(ifp), cp->name, 1791 sppp_state_name(sp->state[cp->protoidx])); 1792 } 1793 } 1794 1795 1796 static void 1797 sppp_open_event(const struct cp *cp, struct sppp *sp) 1798 { 1799 STDDCL; 1800 1801 if (debug) 1802 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n", 1803 SPP_ARGS(ifp), cp->name, 1804 sppp_state_name(sp->state[cp->protoidx])); 1805 1806 switch (sp->state[cp->protoidx]) { 1807 case STATE_INITIAL: 1808 (cp->tls)(sp); 1809 sppp_cp_change_state(cp, sp, STATE_STARTING); 1810 break; 1811 case STATE_STARTING: 1812 break; 1813 case STATE_CLOSED: 1814 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1815 (cp->scr)(sp); 1816 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1817 break; 1818 case STATE_STOPPED: 1819 case STATE_STOPPING: 1820 case STATE_REQ_SENT: 1821 case STATE_ACK_RCVD: 1822 case STATE_ACK_SENT: 1823 case STATE_OPENED: 1824 break; 1825 case STATE_CLOSING: 1826 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1827 break; 1828 } 1829 } 1830 1831 1832 static void 1833 sppp_close_event(const struct cp *cp, struct sppp *sp) 1834 { 1835 STDDCL; 1836 1837 if (debug) 1838 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n", 1839 SPP_ARGS(ifp), cp->name, 1840 sppp_state_name(sp->state[cp->protoidx])); 1841 1842 switch (sp->state[cp->protoidx]) { 1843 case STATE_INITIAL: 1844 case STATE_CLOSED: 1845 case STATE_CLOSING: 1846 break; 1847 case STATE_STARTING: 1848 (cp->tlf)(sp); 1849 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1850 break; 1851 case STATE_STOPPED: 1852 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1853 break; 1854 case STATE_STOPPING: 1855 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1856 break; 1857 case STATE_OPENED: 1858 (cp->tld)(sp); 1859 /* fall through */ 1860 case STATE_REQ_SENT: 1861 case STATE_ACK_RCVD: 1862 case STATE_ACK_SENT: 1863 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1864 sppp_cp_send(sp, cp->proto, TERM_REQ, 1865 ++sp->pp_seq[cp->protoidx], 0, 0); 1866 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1867 break; 1868 } 1869 } 1870 1871 static void 1872 sppp_to_event(const struct cp *cp, struct sppp *sp) 1873 { 1874 STDDCL; 1875 int s; 1876 1877 s = splnet(); 1878 if (debug) 1879 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n", 1880 SPP_ARGS(ifp), cp->name, 1881 sppp_state_name(sp->state[cp->protoidx]), 1882 sp->rst_counter[cp->protoidx]); 1883 1884 if (--sp->rst_counter[cp->protoidx] < 0) 1885 /* TO- event */ 1886 switch (sp->state[cp->protoidx]) { 1887 case STATE_CLOSING: 1888 (cp->tlf)(sp); 1889 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1890 sppp_lcp_check_and_close(sp); 1891 break; 1892 case STATE_STOPPING: 1893 (cp->tlf)(sp); 1894 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1895 sppp_lcp_check_and_close(sp); 1896 break; 1897 case STATE_REQ_SENT: 1898 case STATE_ACK_RCVD: 1899 case STATE_ACK_SENT: 1900 (cp->tlf)(sp); 1901 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1902 sppp_lcp_check_and_close(sp); 1903 break; 1904 } 1905 else 1906 /* TO+ event */ 1907 switch (sp->state[cp->protoidx]) { 1908 case STATE_CLOSING: 1909 case STATE_STOPPING: 1910 sppp_cp_send(sp, cp->proto, TERM_REQ, 1911 ++sp->pp_seq[cp->protoidx], 0, 0); 1912 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1913 cp->TO, sp); 1914 break; 1915 case STATE_REQ_SENT: 1916 case STATE_ACK_RCVD: 1917 (cp->scr)(sp); 1918 /* sppp_cp_change_state() will restart the timer */ 1919 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1920 break; 1921 case STATE_ACK_SENT: 1922 (cp->scr)(sp); 1923 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1924 cp->TO, sp); 1925 break; 1926 } 1927 1928 splx(s); 1929 } 1930 1931 /* 1932 * Change the state of a control protocol in the state automaton. 1933 * Takes care of starting/stopping the restart timer. 1934 */ 1935 void 1936 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1937 { 1938 sp->state[cp->protoidx] = newstate; 1939 callout_stop(&sp->ch[cp->protoidx]); 1940 switch (newstate) { 1941 case STATE_INITIAL: 1942 case STATE_STARTING: 1943 case STATE_CLOSED: 1944 case STATE_STOPPED: 1945 case STATE_OPENED: 1946 break; 1947 case STATE_CLOSING: 1948 case STATE_STOPPING: 1949 case STATE_REQ_SENT: 1950 case STATE_ACK_RCVD: 1951 case STATE_ACK_SENT: 1952 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1953 cp->TO, sp); 1954 break; 1955 } 1956 } 1957 /* 1959 *--------------------------------------------------------------------------* 1960 * * 1961 * The LCP implementation. * 1962 * * 1963 *--------------------------------------------------------------------------* 1964 */ 1965 static void 1966 sppp_lcp_init(struct sppp *sp) 1967 { 1968 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1969 sp->lcp.magic = 0; 1970 sp->state[IDX_LCP] = STATE_INITIAL; 1971 sp->fail_counter[IDX_LCP] = 0; 1972 sp->pp_seq[IDX_LCP] = 0; 1973 sp->pp_rseq[IDX_LCP] = 0; 1974 sp->lcp.protos = 0; 1975 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 1976 1977 /* 1978 * Initialize counters and timeout values. Note that we don't 1979 * use the 3 seconds suggested in RFC 1661 since we are likely 1980 * running on a fast link. XXX We should probably implement 1981 * the exponential backoff option. Note that these values are 1982 * relevant for all control protocols, not just LCP only. 1983 */ 1984 sp->lcp.timeout = 1 * hz; 1985 sp->lcp.max_terminate = 2; 1986 sp->lcp.max_configure = 10; 1987 sp->lcp.max_failure = 10; 1988 callout_init(&sp->ch[IDX_LCP]); 1989 } 1990 1991 static void 1992 sppp_lcp_up(struct sppp *sp) 1993 { 1994 STDDCL; 1995 1996 /* 1997 * If this interface is passive or dial-on-demand, and we are 1998 * still in Initial state, it means we've got an incoming 1999 * call. Activate the interface. 2000 */ 2001 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2002 if (debug) 2003 log(LOG_DEBUG, 2004 SPP_FMT "Up event", SPP_ARGS(ifp)); 2005 ifp->if_flags |= IFF_RUNNING; 2006 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2007 if (debug) 2008 addlog("(incoming call)\n"); 2009 sp->pp_flags |= PP_CALLIN; 2010 lcp.Open(sp); 2011 } else if (debug) 2012 addlog("\n"); 2013 } 2014 2015 sppp_up_event(&lcp, sp); 2016 } 2017 2018 static void 2019 sppp_lcp_down(struct sppp *sp) 2020 { 2021 STDDCL; 2022 2023 sppp_down_event(&lcp, sp); 2024 2025 /* 2026 * If this is neither a dial-on-demand nor a passive 2027 * interface, simulate an ``ifconfig down'' action, so the 2028 * administrator can force a redial by another ``ifconfig 2029 * up''. XXX For leased line operation, should we immediately 2030 * try to reopen the connection here? 2031 */ 2032 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2033 log(LOG_INFO, 2034 SPP_FMT "Down event (carrier loss), taking interface down.\n", 2035 SPP_ARGS(ifp)); 2036 if_down(ifp); 2037 } else { 2038 if (debug) 2039 log(LOG_DEBUG, 2040 SPP_FMT "Down event (carrier loss)\n", 2041 SPP_ARGS(ifp)); 2042 } 2043 sp->pp_flags &= ~PP_CALLIN; 2044 if (sp->state[IDX_LCP] != STATE_INITIAL) 2045 lcp.Close(sp); 2046 ifp->if_flags &= ~IFF_RUNNING; 2047 } 2048 2049 static void 2050 sppp_lcp_open(struct sppp *sp) 2051 { 2052 /* 2053 * If we are authenticator, negotiate LCP_AUTH 2054 */ 2055 if (sp->hisauth.proto != 0) 2056 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2057 else 2058 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2059 sp->pp_flags &= ~PP_NEEDAUTH; 2060 sppp_open_event(&lcp, sp); 2061 } 2062 2063 static void 2064 sppp_lcp_close(struct sppp *sp) 2065 { 2066 sppp_close_event(&lcp, sp); 2067 } 2068 2069 static void 2070 sppp_lcp_TO(void *cookie) 2071 { 2072 sppp_to_event(&lcp, (struct sppp *)cookie); 2073 } 2074 2075 /* 2076 * Analyze a configure request. Return true if it was agreeable, and 2077 * caused action sca, false if it has been rejected or nak'ed, and 2078 * caused action scn. (The return value is used to make the state 2079 * transition decision in the state automaton.) 2080 */ 2081 static int 2082 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2083 { 2084 STDDCL; 2085 u_char *buf, *r, *p; 2086 int origlen, rlen; 2087 u_int32_t nmagic; 2088 u_short authproto; 2089 2090 len -= 4; 2091 origlen = len; 2092 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2093 if (! buf) 2094 return (0); 2095 2096 if (debug) 2097 log(LOG_DEBUG, SPP_FMT "lcp parse opts:", 2098 SPP_ARGS(ifp)); 2099 2100 /* pass 1: check for things that need to be rejected */ 2101 p = (void*) (h+1); 2102 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2103 if (debug) 2104 addlog(" %s", sppp_lcp_opt_name(*p)); 2105 switch (*p) { 2106 case LCP_OPT_MAGIC: 2107 /* Magic number. */ 2108 /* fall through, both are same length */ 2109 case LCP_OPT_ASYNC_MAP: 2110 /* Async control character map. */ 2111 if (len >= 6 || p[1] == 6) 2112 continue; 2113 if (debug) 2114 addlog(" [invalid]"); 2115 break; 2116 case LCP_OPT_MRU: 2117 /* Maximum receive unit. */ 2118 if (len >= 4 && p[1] == 4) 2119 continue; 2120 if (debug) 2121 addlog(" [invalid]"); 2122 break; 2123 case LCP_OPT_AUTH_PROTO: 2124 if (len < 4) { 2125 if (debug) 2126 addlog(" [invalid]"); 2127 break; 2128 } 2129 authproto = (p[2] << 8) + p[3]; 2130 if (authproto == PPP_CHAP && p[1] != 5) { 2131 if (debug) 2132 addlog(" [invalid chap len]"); 2133 break; 2134 } 2135 if (sp->myauth.proto == 0) { 2136 /* we are not configured to do auth */ 2137 if (debug) 2138 addlog(" [not configured]"); 2139 break; 2140 } 2141 /* 2142 * Remote want us to authenticate, remember this, 2143 * so we stay in PHASE_AUTHENTICATE after LCP got 2144 * up. 2145 */ 2146 sp->pp_flags |= PP_NEEDAUTH; 2147 continue; 2148 default: 2149 /* Others not supported. */ 2150 if (debug) 2151 addlog(" [rej]"); 2152 break; 2153 } 2154 /* Add the option to rejected list. */ 2155 bcopy (p, r, p[1]); 2156 r += p[1]; 2157 rlen += p[1]; 2158 } 2159 if (rlen) { 2160 if (debug) 2161 addlog(" send conf-rej\n"); 2162 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2163 goto end; 2164 } else if (debug) 2165 addlog("\n"); 2166 2167 /* 2168 * pass 2: check for option values that are unacceptable and 2169 * thus require to be nak'ed. 2170 */ 2171 if (debug) 2172 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ", 2173 SPP_ARGS(ifp)); 2174 2175 p = (void*) (h+1); 2176 len = origlen; 2177 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2178 if (debug) 2179 addlog(" %s", sppp_lcp_opt_name(*p)); 2180 switch (*p) { 2181 case LCP_OPT_MAGIC: 2182 /* Magic number -- extract. */ 2183 nmagic = (u_int32_t)p[2] << 24 | 2184 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2185 if (nmagic != sp->lcp.magic) { 2186 if (debug) 2187 addlog(" 0x%x", nmagic); 2188 continue; 2189 } 2190 /* 2191 * Local and remote magics equal -- loopback? 2192 */ 2193 if (sp->pp_loopcnt >= MAXALIVECNT*5) { 2194 printf (SPP_FMT "loopback\n", 2195 SPP_ARGS(ifp)); 2196 sp->pp_loopcnt = 0; 2197 if (ifp->if_flags & IFF_UP) { 2198 if_down(ifp); 2199 IF_PURGE(&sp->pp_cpq); 2200 /* XXX ? */ 2201 lcp.Down(sp); 2202 lcp.Up(sp); 2203 } 2204 } else if (debug) 2205 addlog(" [glitch]"); 2206 ++sp->pp_loopcnt; 2207 /* 2208 * We negate our magic here, and NAK it. If 2209 * we see it later in an NAK packet, we 2210 * suggest a new one. 2211 */ 2212 nmagic = ~sp->lcp.magic; 2213 /* Gonna NAK it. */ 2214 p[2] = nmagic >> 24; 2215 p[3] = nmagic >> 16; 2216 p[4] = nmagic >> 8; 2217 p[5] = nmagic; 2218 break; 2219 2220 case LCP_OPT_ASYNC_MAP: 2221 /* Async control character map -- check to be zero. */ 2222 if (! p[2] && ! p[3] && ! p[4] && ! p[5]) { 2223 if (debug) 2224 addlog(" [empty]"); 2225 continue; 2226 } 2227 if (debug) 2228 addlog(" [non-empty]"); 2229 /* suggest a zero one */ 2230 p[2] = p[3] = p[4] = p[5] = 0; 2231 break; 2232 2233 case LCP_OPT_MRU: 2234 /* 2235 * Maximum receive unit. Always agreeable, 2236 * but ignored by now. 2237 */ 2238 sp->lcp.their_mru = p[2] * 256 + p[3]; 2239 if (debug) 2240 addlog(" %ld", sp->lcp.their_mru); 2241 continue; 2242 2243 case LCP_OPT_AUTH_PROTO: 2244 authproto = (p[2] << 8) + p[3]; 2245 if (sp->myauth.proto != authproto) { 2246 /* not agreed, nak */ 2247 if (debug) 2248 addlog(" [mine %s != his %s]", 2249 sppp_proto_name(sp->hisauth.proto), 2250 sppp_proto_name(authproto)); 2251 p[2] = sp->myauth.proto >> 8; 2252 p[3] = sp->myauth.proto; 2253 break; 2254 } 2255 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2256 if (debug) 2257 addlog(" [chap not MD5]"); 2258 p[4] = CHAP_MD5; 2259 break; 2260 } 2261 continue; 2262 } 2263 /* Add the option to nak'ed list. */ 2264 bcopy (p, r, p[1]); 2265 r += p[1]; 2266 rlen += p[1]; 2267 } 2268 if (rlen) { 2269 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2270 if (debug) 2271 addlog(" max_failure (%d) exceeded, " 2272 "send conf-rej\n", 2273 sp->lcp.max_failure); 2274 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2275 } else { 2276 if (debug) 2277 addlog(" send conf-nak\n"); 2278 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2279 } 2280 goto end; 2281 } else { 2282 if (debug) 2283 addlog(" send conf-ack\n"); 2284 sp->fail_counter[IDX_LCP] = 0; 2285 sp->pp_loopcnt = 0; 2286 sppp_cp_send (sp, PPP_LCP, CONF_ACK, 2287 h->ident, origlen, h+1); 2288 } 2289 2290 end: 2291 free (buf, M_TEMP); 2292 return (rlen == 0); 2293 } 2294 2295 /* 2296 * Analyze the LCP Configure-Reject option list, and adjust our 2297 * negotiation. 2298 */ 2299 static void 2300 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2301 { 2302 STDDCL; 2303 u_char *buf, *p; 2304 2305 len -= 4; 2306 buf = malloc (len, M_TEMP, M_NOWAIT); 2307 if (!buf) 2308 return; 2309 2310 if (debug) 2311 log(LOG_DEBUG, SPP_FMT "lcp rej opts:", 2312 SPP_ARGS(ifp)); 2313 2314 p = (void*) (h+1); 2315 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2316 if (debug) 2317 addlog(" %s", sppp_lcp_opt_name(*p)); 2318 switch (*p) { 2319 case LCP_OPT_MAGIC: 2320 /* Magic number -- can't use it, use 0 */ 2321 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2322 sp->lcp.magic = 0; 2323 break; 2324 case LCP_OPT_MRU: 2325 /* 2326 * Should not be rejected anyway, since we only 2327 * negotiate a MRU if explicitly requested by 2328 * peer. 2329 */ 2330 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2331 break; 2332 case LCP_OPT_AUTH_PROTO: 2333 /* 2334 * Peer doesn't want to authenticate himself, 2335 * deny unless this is a dialout call, and 2336 * AUTHFLAG_NOCALLOUT is set. 2337 */ 2338 if ((sp->pp_flags & PP_CALLIN) == 0 && 2339 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) { 2340 if (debug) 2341 addlog(" [don't insist on auth " 2342 "for callout]"); 2343 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2344 break; 2345 } 2346 if (debug) 2347 addlog("[access denied]\n"); 2348 lcp.Close(sp); 2349 break; 2350 } 2351 } 2352 if (debug) 2353 addlog("\n"); 2354 free (buf, M_TEMP); 2355 return; 2356 } 2357 2358 /* 2359 * Analyze the LCP Configure-NAK option list, and adjust our 2360 * negotiation. 2361 */ 2362 static void 2363 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2364 { 2365 STDDCL; 2366 u_char *buf, *p; 2367 u_int32_t magic; 2368 2369 len -= 4; 2370 buf = malloc (len, M_TEMP, M_NOWAIT); 2371 if (!buf) 2372 return; 2373 2374 if (debug) 2375 log(LOG_DEBUG, SPP_FMT "lcp nak opts:", 2376 SPP_ARGS(ifp)); 2377 2378 p = (void*) (h+1); 2379 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2380 if (debug) 2381 addlog(" %s", sppp_lcp_opt_name(*p)); 2382 switch (*p) { 2383 case LCP_OPT_MAGIC: 2384 /* Magic number -- renegotiate */ 2385 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2386 len >= 6 && p[1] == 6) { 2387 magic = (u_int32_t)p[2] << 24 | 2388 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2389 /* 2390 * If the remote magic is our negated one, 2391 * this looks like a loopback problem. 2392 * Suggest a new magic to make sure. 2393 */ 2394 if (magic == ~sp->lcp.magic) { 2395 if (debug) 2396 addlog(" magic glitch"); 2397 sp->lcp.magic = random(); 2398 } else { 2399 sp->lcp.magic = magic; 2400 if (debug) 2401 addlog(" %d", magic); 2402 } 2403 } 2404 break; 2405 case LCP_OPT_MRU: 2406 /* 2407 * Peer wants to advise us to negotiate an MRU. 2408 * Agree on it if it's reasonable, or use 2409 * default otherwise. 2410 */ 2411 if (len >= 4 && p[1] == 4) { 2412 u_int mru = p[2] * 256 + p[3]; 2413 if (debug) 2414 addlog(" %d", mru); 2415 if (mru < PP_MTU || mru > PP_MAX_MRU) 2416 mru = PP_MTU; 2417 sp->lcp.mru = mru; 2418 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2419 } 2420 break; 2421 case LCP_OPT_AUTH_PROTO: 2422 /* 2423 * Peer doesn't like our authentication method, 2424 * deny. 2425 */ 2426 if (debug) 2427 addlog("[access denied]\n"); 2428 lcp.Close(sp); 2429 break; 2430 } 2431 } 2432 if (debug) 2433 addlog("\n"); 2434 free (buf, M_TEMP); 2435 return; 2436 } 2437 2438 static void 2439 sppp_lcp_tlu(struct sppp *sp) 2440 { 2441 STDDCL; 2442 int i; 2443 u_int32_t mask; 2444 2445 /* XXX ? */ 2446 if (! (ifp->if_flags & IFF_UP) && 2447 (ifp->if_flags & IFF_RUNNING)) { 2448 /* Coming out of loopback mode. */ 2449 if_up(ifp); 2450 printf (SPP_FMT "up\n", SPP_ARGS(ifp)); 2451 } 2452 2453 for (i = 0; i < IDX_COUNT; i++) 2454 if ((cps[i])->flags & CP_QUAL) 2455 (cps[i])->Open(sp); 2456 2457 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2458 (sp->pp_flags & PP_NEEDAUTH) != 0) 2459 sp->pp_phase = PHASE_AUTHENTICATE; 2460 else 2461 sp->pp_phase = PHASE_NETWORK; 2462 2463 if(debug) 2464 { 2465 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2466 sppp_phase_name(sp->pp_phase)); 2467 } 2468 2469 /* 2470 * Open all authentication protocols. This is even required 2471 * if we already proceeded to network phase, since it might be 2472 * that remote wants us to authenticate, so we might have to 2473 * send a PAP request. Undesired authentication protocols 2474 * don't do anything when they get an Open event. 2475 */ 2476 for (i = 0; i < IDX_COUNT; i++) 2477 if ((cps[i])->flags & CP_AUTH) 2478 (cps[i])->Open(sp); 2479 2480 if (sp->pp_phase == PHASE_NETWORK) { 2481 /* Notify all NCPs. */ 2482 for (i = 0; i < IDX_COUNT; i++) 2483 if ((cps[i])->flags & CP_NCP) 2484 (cps[i])->Open(sp); 2485 } 2486 2487 /* Send Up events to all started protos. */ 2488 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2489 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2490 (cps[i])->Up(sp); 2491 2492 /* notify low-level driver of state change */ 2493 if (sp->pp_chg) 2494 sp->pp_chg(sp, (int)sp->pp_phase); 2495 2496 if (sp->pp_phase == PHASE_NETWORK) 2497 /* if no NCP is starting, close down */ 2498 sppp_lcp_check_and_close(sp); 2499 } 2500 2501 static void 2502 sppp_lcp_tld(struct sppp *sp) 2503 { 2504 STDDCL; 2505 int i; 2506 u_int32_t mask; 2507 2508 sp->pp_phase = PHASE_TERMINATE; 2509 2510 if(debug) 2511 { 2512 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2513 sppp_phase_name(sp->pp_phase)); 2514 } 2515 2516 /* 2517 * Take upper layers down. We send the Down event first and 2518 * the Close second to prevent the upper layers from sending 2519 * ``a flurry of terminate-request packets'', as the RFC 2520 * describes it. 2521 */ 2522 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2523 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2524 (cps[i])->Down(sp); 2525 (cps[i])->Close(sp); 2526 } 2527 } 2528 2529 static void 2530 sppp_lcp_tls(struct sppp *sp) 2531 { 2532 STDDCL; 2533 2534 sp->pp_phase = PHASE_ESTABLISH; 2535 2536 if(debug) 2537 { 2538 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2539 sppp_phase_name(sp->pp_phase)); 2540 } 2541 2542 /* Notify lower layer if desired. */ 2543 if (sp->pp_tls) 2544 (sp->pp_tls)(sp); 2545 } 2546 2547 static void 2548 sppp_lcp_tlf(struct sppp *sp) 2549 { 2550 STDDCL; 2551 2552 sp->pp_phase = PHASE_DEAD; 2553 2554 if(debug) 2555 { 2556 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2557 sppp_phase_name(sp->pp_phase)); 2558 } 2559 2560 /* Notify lower layer if desired. */ 2561 if (sp->pp_tlf) 2562 (sp->pp_tlf)(sp); 2563 } 2564 2565 static void 2566 sppp_lcp_scr(struct sppp *sp) 2567 { 2568 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2569 int i = 0; 2570 u_short authproto; 2571 2572 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2573 if (! sp->lcp.magic) 2574 sp->lcp.magic = random(); 2575 opt[i++] = LCP_OPT_MAGIC; 2576 opt[i++] = 6; 2577 opt[i++] = sp->lcp.magic >> 24; 2578 opt[i++] = sp->lcp.magic >> 16; 2579 opt[i++] = sp->lcp.magic >> 8; 2580 opt[i++] = sp->lcp.magic; 2581 } 2582 2583 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2584 opt[i++] = LCP_OPT_MRU; 2585 opt[i++] = 4; 2586 opt[i++] = sp->lcp.mru >> 8; 2587 opt[i++] = sp->lcp.mru; 2588 } 2589 2590 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2591 authproto = sp->hisauth.proto; 2592 opt[i++] = LCP_OPT_AUTH_PROTO; 2593 opt[i++] = authproto == PPP_CHAP? 5: 4; 2594 opt[i++] = authproto >> 8; 2595 opt[i++] = authproto; 2596 if (authproto == PPP_CHAP) 2597 opt[i++] = CHAP_MD5; 2598 } 2599 2600 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2601 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2602 } 2603 2604 /* 2605 * Check the open NCPs, return true if at least one NCP is open. 2606 */ 2607 static int 2608 sppp_ncp_check(struct sppp *sp) 2609 { 2610 int i, mask; 2611 2612 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2613 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2614 return 1; 2615 return 0; 2616 } 2617 2618 /* 2619 * Re-check the open NCPs and see if we should terminate the link. 2620 * Called by the NCPs during their tlf action handling. 2621 */ 2622 static void 2623 sppp_lcp_check_and_close(struct sppp *sp) 2624 { 2625 2626 if (sp->pp_phase < PHASE_NETWORK) 2627 /* don't bother, we are already going down */ 2628 return; 2629 2630 if (sppp_ncp_check(sp)) 2631 return; 2632 2633 lcp.Close(sp); 2634 } 2635 2636 2637 /* 2639 *--------------------------------------------------------------------------* 2640 * * 2641 * The IPCP implementation. * 2642 * * 2643 *--------------------------------------------------------------------------* 2644 */ 2645 2646 static void 2647 sppp_ipcp_init(struct sppp *sp) 2648 { 2649 sp->ipcp.opts = 0; 2650 sp->ipcp.flags = 0; 2651 sp->state[IDX_IPCP] = STATE_INITIAL; 2652 sp->fail_counter[IDX_IPCP] = 0; 2653 sp->pp_seq[IDX_IPCP] = 0; 2654 sp->pp_rseq[IDX_IPCP] = 0; 2655 callout_init(&sp->ch[IDX_IPCP]); 2656 } 2657 2658 static void 2659 sppp_ipcp_up(struct sppp *sp) 2660 { 2661 sppp_up_event(&ipcp, sp); 2662 } 2663 2664 static void 2665 sppp_ipcp_down(struct sppp *sp) 2666 { 2667 sppp_down_event(&ipcp, sp); 2668 } 2669 2670 static void 2671 sppp_ipcp_open(struct sppp *sp) 2672 { 2673 STDDCL; 2674 u_int32_t myaddr, hisaddr; 2675 2676 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2677 sp->ipcp.req_myaddr = 0; 2678 sp->ipcp.req_hisaddr = 0; 2679 2680 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2681 /* 2682 * If we don't have his address, this probably means our 2683 * interface doesn't want to talk IP at all. (This could 2684 * be the case if somebody wants to speak only IPX, for 2685 * example.) Don't open IPCP in this case. 2686 */ 2687 if (hisaddr == 0L) { 2688 /* XXX this message should go away */ 2689 if (debug) 2690 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n", 2691 SPP_ARGS(ifp)); 2692 return; 2693 } 2694 2695 if (myaddr == 0) { 2696 /* 2697 * I don't have an assigned address, so i need to 2698 * negotiate my address. 2699 */ 2700 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2701 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2702 } 2703 if (hisaddr == 1) { 2704 /* 2705 * XXX - remove this hack! 2706 * remote has no valid adress, we need to get one assigned. 2707 */ 2708 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2709 } 2710 sppp_open_event(&ipcp, sp); 2711 } 2712 2713 static void 2714 sppp_ipcp_close(struct sppp *sp) 2715 { 2716 sppp_close_event(&ipcp, sp); 2717 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2718 /* 2719 * Some address was dynamic, clear it again. 2720 */ 2721 sppp_clear_ip_addrs(sp); 2722 } 2723 2724 static void 2725 sppp_ipcp_TO(void *cookie) 2726 { 2727 sppp_to_event(&ipcp, (struct sppp *)cookie); 2728 } 2729 2730 /* 2731 * Analyze a configure request. Return true if it was agreeable, and 2732 * caused action sca, false if it has been rejected or nak'ed, and 2733 * caused action scn. (The return value is used to make the state 2734 * transition decision in the state automaton.) 2735 */ 2736 static int 2737 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2738 { 2739 u_char *buf, *r, *p; 2740 struct ifnet *ifp = &sp->pp_if; 2741 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2742 u_int32_t hisaddr, desiredaddr; 2743 2744 len -= 4; 2745 origlen = len; 2746 /* 2747 * Make sure to allocate a buf that can at least hold a 2748 * conf-nak with an `address' option. We might need it below. 2749 */ 2750 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2751 if (! buf) 2752 return (0); 2753 2754 /* pass 1: see if we can recognize them */ 2755 if (debug) 2756 log(LOG_DEBUG, SPP_FMT "ipcp parse opts:", 2757 SPP_ARGS(ifp)); 2758 p = (void*) (h+1); 2759 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2760 if (debug) 2761 addlog(" %s", sppp_ipcp_opt_name(*p)); 2762 switch (*p) { 2763 #ifdef notyet 2764 case IPCP_OPT_COMPRESSION: 2765 if (len >= 6 && p[1] >= 6) { 2766 /* correctly formed compress option */ 2767 continue; 2768 } 2769 if (debug) 2770 addlog(" [invalid]"); 2771 break; 2772 #endif 2773 case IPCP_OPT_ADDRESS: 2774 if (len >= 6 && p[1] == 6) { 2775 /* correctly formed address option */ 2776 continue; 2777 } 2778 if (debug) 2779 addlog(" [invalid]"); 2780 break; 2781 default: 2782 /* Others not supported. */ 2783 if (debug) 2784 addlog(" [rej]"); 2785 break; 2786 } 2787 /* Add the option to rejected list. */ 2788 bcopy (p, r, p[1]); 2789 r += p[1]; 2790 rlen += p[1]; 2791 } 2792 if (rlen) { 2793 if (debug) 2794 addlog(" send conf-rej\n"); 2795 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2796 goto end; 2797 } else if (debug) 2798 addlog("\n"); 2799 2800 /* pass 2: parse option values */ 2801 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2802 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2803 else 2804 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2805 if (debug) 2806 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ", 2807 SPP_ARGS(ifp)); 2808 p = (void*) (h+1); 2809 len = origlen; 2810 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2811 if (debug) 2812 addlog(" %s", sppp_ipcp_opt_name(*p)); 2813 switch (*p) { 2814 #ifdef notyet 2815 case IPCP_OPT_COMPRESSION: 2816 continue; 2817 #endif 2818 case IPCP_OPT_ADDRESS: 2819 desiredaddr = p[2] << 24 | p[3] << 16 | 2820 p[4] << 8 | p[5]; 2821 if (desiredaddr == hisaddr || 2822 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2823 /* 2824 * Peer's address is same as our value, 2825 * this is agreeable. Gonna conf-ack 2826 * it. 2827 */ 2828 if (debug) 2829 addlog(" %s [ack]", 2830 sppp_dotted_quad(hisaddr)); 2831 /* record that we've seen it already */ 2832 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2833 sp->ipcp.req_hisaddr = desiredaddr; 2834 hisaddr = desiredaddr; 2835 continue; 2836 } 2837 /* 2838 * The address wasn't agreeable. This is either 2839 * he sent us 0.0.0.0, asking to assign him an 2840 * address, or he send us another address not 2841 * matching our value. Either case, we gonna 2842 * conf-nak it with our value. 2843 */ 2844 if (debug) { 2845 if (desiredaddr == 0) 2846 addlog(" [addr requested]"); 2847 else 2848 addlog(" %s [not agreed]", 2849 sppp_dotted_quad(desiredaddr)); 2850 } 2851 2852 p[2] = hisaddr >> 24; 2853 p[3] = hisaddr >> 16; 2854 p[4] = hisaddr >> 8; 2855 p[5] = hisaddr; 2856 break; 2857 } 2858 /* Add the option to nak'ed list. */ 2859 bcopy (p, r, p[1]); 2860 r += p[1]; 2861 rlen += p[1]; 2862 } 2863 2864 /* 2865 * If we are about to conf-ack the request, but haven't seen 2866 * his address so far, gonna conf-nak it instead, with the 2867 * `address' option present and our idea of his address being 2868 * filled in there, to request negotiation of both addresses. 2869 * 2870 * XXX This can result in an endless req - nak loop if peer 2871 * doesn't want to send us his address. Q: What should we do 2872 * about it? XXX A: implement the max-failure counter. 2873 */ 2874 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2875 buf[0] = IPCP_OPT_ADDRESS; 2876 buf[1] = 6; 2877 buf[2] = hisaddr >> 24; 2878 buf[3] = hisaddr >> 16; 2879 buf[4] = hisaddr >> 8; 2880 buf[5] = hisaddr; 2881 rlen = 6; 2882 if (debug) 2883 addlog(" still need hisaddr"); 2884 } 2885 2886 if (rlen) { 2887 if (debug) 2888 addlog(" send conf-nak\n"); 2889 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2890 } else { 2891 if (debug) 2892 addlog(" send conf-ack\n"); 2893 sppp_cp_send (sp, PPP_IPCP, CONF_ACK, 2894 h->ident, origlen, h+1); 2895 } 2896 2897 end: 2898 free (buf, M_TEMP); 2899 return (rlen == 0); 2900 } 2901 2902 /* 2903 * Analyze the IPCP Configure-Reject option list, and adjust our 2904 * negotiation. 2905 */ 2906 static void 2907 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2908 { 2909 u_char *buf, *p; 2910 struct ifnet *ifp = &sp->pp_if; 2911 int debug = ifp->if_flags & IFF_DEBUG; 2912 2913 len -= 4; 2914 buf = malloc (len, M_TEMP, M_NOWAIT); 2915 if (!buf) 2916 return; 2917 2918 if (debug) 2919 log(LOG_DEBUG, SPP_FMT "ipcp rej opts:", 2920 SPP_ARGS(ifp)); 2921 2922 p = (void*) (h+1); 2923 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2924 if (debug) 2925 addlog(" %s", sppp_ipcp_opt_name(*p)); 2926 switch (*p) { 2927 case IPCP_OPT_ADDRESS: 2928 /* 2929 * Peer doesn't grok address option. This is 2930 * bad. XXX Should we better give up here? 2931 */ 2932 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 2933 break; 2934 #ifdef notyet 2935 case IPCP_OPT_COMPRESS: 2936 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 2937 break; 2938 #endif 2939 } 2940 } 2941 if (debug) 2942 addlog("\n"); 2943 free (buf, M_TEMP); 2944 return; 2945 } 2946 2947 /* 2948 * Analyze the IPCP Configure-NAK option list, and adjust our 2949 * negotiation. 2950 */ 2951 static void 2952 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2953 { 2954 u_char *buf, *p; 2955 struct ifnet *ifp = &sp->pp_if; 2956 int debug = ifp->if_flags & IFF_DEBUG; 2957 u_int32_t wantaddr; 2958 2959 len -= 4; 2960 buf = malloc (len, M_TEMP, M_NOWAIT); 2961 if (!buf) 2962 return; 2963 2964 if (debug) 2965 log(LOG_DEBUG, SPP_FMT "ipcp nak opts:", 2966 SPP_ARGS(ifp)); 2967 2968 p = (void*) (h+1); 2969 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2970 if (debug) 2971 addlog(" %s", sppp_ipcp_opt_name(*p)); 2972 switch (*p) { 2973 case IPCP_OPT_ADDRESS: 2974 /* 2975 * Peer doesn't like our local IP address. See 2976 * if we can do something for him. We'll drop 2977 * him our address then. 2978 */ 2979 if (len >= 6 && p[1] == 6) { 2980 wantaddr = p[2] << 24 | p[3] << 16 | 2981 p[4] << 8 | p[5]; 2982 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2983 if (debug) 2984 addlog(" [wantaddr %s]", 2985 sppp_dotted_quad(wantaddr)); 2986 /* 2987 * When doing dynamic address assignment, 2988 * we accept his offer. Otherwise, we 2989 * ignore it and thus continue to negotiate 2990 * our already existing value. 2991 */ 2992 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 2993 if (debug) 2994 addlog(" [agree]"); 2995 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 2996 sp->ipcp.req_myaddr = wantaddr; 2997 } 2998 } 2999 break; 3000 #ifdef notyet 3001 case IPCP_OPT_COMPRESS: 3002 /* 3003 * Peer wants different compression parameters. 3004 */ 3005 break; 3006 #endif 3007 } 3008 } 3009 if (debug) 3010 addlog("\n"); 3011 free (buf, M_TEMP); 3012 return; 3013 } 3014 3015 static void 3016 sppp_ipcp_tlu(struct sppp *sp) 3017 { 3018 /* we are up. Set addresses and notify anyone interested */ 3019 u_int32_t myaddr, hisaddr; 3020 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3021 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3022 myaddr = sp->ipcp.req_myaddr; 3023 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3024 hisaddr = sp->ipcp.req_hisaddr; 3025 sppp_set_ip_addrs(sp, myaddr, hisaddr); 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 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3069 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3070 else 3071 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3072 opt[i++] = IPCP_OPT_ADDRESS; 3073 opt[i++] = 6; 3074 opt[i++] = ouraddr >> 24; 3075 opt[i++] = ouraddr >> 16; 3076 opt[i++] = ouraddr >> 8; 3077 opt[i++] = ouraddr; 3078 } 3079 3080 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3081 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3082 } 3083 3084 3085 /* 3087 *--------------------------------------------------------------------------* 3088 * * 3089 * The IPv6CP implementation. * 3090 * * 3091 *--------------------------------------------------------------------------* 3092 */ 3093 3094 #ifdef INET6 3095 static void 3096 sppp_ipv6cp_init(struct sppp *sp) 3097 { 3098 sp->ipv6cp.opts = 0; 3099 sp->ipv6cp.flags = 0; 3100 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3101 sp->fail_counter[IDX_IPV6CP] = 0; 3102 sp->pp_seq[IDX_IPV6CP] = 0; 3103 sp->pp_rseq[IDX_IPV6CP] = 0; 3104 callout_init(&sp->ch[IDX_IPV6CP]); 3105 } 3106 3107 static void 3108 sppp_ipv6cp_up(struct sppp *sp) 3109 { 3110 sppp_up_event(&ipv6cp, sp); 3111 } 3112 3113 static void 3114 sppp_ipv6cp_down(struct sppp *sp) 3115 { 3116 sppp_down_event(&ipv6cp, sp); 3117 } 3118 3119 static void 3120 sppp_ipv6cp_open(struct sppp *sp) 3121 { 3122 STDDCL; 3123 struct in6_addr myaddr, hisaddr; 3124 3125 #ifdef IPV6CP_MYIFID_DYN 3126 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3127 #else 3128 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3129 #endif 3130 3131 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3132 /* 3133 * If we don't have our address, this probably means our 3134 * interface doesn't want to talk IPv6 at all. (This could 3135 * be the case if somebody wants to speak only IPX, for 3136 * example.) Don't open IPv6CP in this case. 3137 */ 3138 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3139 /* XXX this message should go away */ 3140 if (debug) 3141 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n", 3142 SPP_ARGS(ifp)); 3143 return; 3144 } 3145 3146 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3147 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3148 sppp_open_event(&ipv6cp, sp); 3149 } 3150 3151 static void 3152 sppp_ipv6cp_close(struct sppp *sp) 3153 { 3154 sppp_close_event(&ipv6cp, sp); 3155 } 3156 3157 static void 3158 sppp_ipv6cp_TO(void *cookie) 3159 { 3160 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3161 } 3162 3163 /* 3164 * Analyze a configure request. Return true if it was agreeable, and 3165 * caused action sca, false if it has been rejected or nak'ed, and 3166 * caused action scn. (The return value is used to make the state 3167 * transition decision in the state automaton.) 3168 */ 3169 static int 3170 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3171 { 3172 u_char *buf, *r, *p; 3173 struct ifnet *ifp = &sp->pp_if; 3174 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3175 struct in6_addr myaddr, desiredaddr, suggestaddr; 3176 int ifidcount; 3177 int type; 3178 int collision, nohisaddr; 3179 3180 len -= 4; 3181 origlen = len; 3182 /* 3183 * Make sure to allocate a buf that can at least hold a 3184 * conf-nak with an `address' option. We might need it below. 3185 */ 3186 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3187 if (! buf) 3188 return (0); 3189 3190 /* pass 1: see if we can recognize them */ 3191 if (debug) 3192 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:", 3193 SPP_ARGS(ifp)); 3194 p = (void*) (h+1); 3195 ifidcount = 0; 3196 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3197 if (debug) 3198 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3199 switch (*p) { 3200 case IPV6CP_OPT_IFID: 3201 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3202 /* correctly formed address option */ 3203 ifidcount++; 3204 continue; 3205 } 3206 if (debug) 3207 addlog(" [invalid]"); 3208 break; 3209 #ifdef notyet 3210 case IPV6CP_OPT_COMPRESSION: 3211 if (len >= 4 && p[1] >= 4) { 3212 /* correctly formed compress option */ 3213 continue; 3214 } 3215 if (debug) 3216 addlog(" [invalid]"); 3217 break; 3218 #endif 3219 default: 3220 /* Others not supported. */ 3221 if (debug) 3222 addlog(" [rej]"); 3223 break; 3224 } 3225 /* Add the option to rejected list. */ 3226 bcopy (p, r, p[1]); 3227 r += p[1]; 3228 rlen += p[1]; 3229 } 3230 if (rlen) { 3231 if (debug) 3232 addlog(" send conf-rej\n"); 3233 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3234 goto end; 3235 } else if (debug) 3236 addlog("\n"); 3237 3238 /* pass 2: parse option values */ 3239 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3240 if (debug) 3241 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ", 3242 SPP_ARGS(ifp)); 3243 p = (void*) (h+1); 3244 len = origlen; 3245 type = CONF_ACK; 3246 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3247 if (debug) 3248 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3249 switch (*p) { 3250 #ifdef notyet 3251 case IPV6CP_OPT_COMPRESSION: 3252 continue; 3253 #endif 3254 case IPV6CP_OPT_IFID: 3255 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3256 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3257 collision = (bcmp(&desiredaddr.s6_addr[8], 3258 &myaddr.s6_addr[8], 8) == 0); 3259 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3260 3261 desiredaddr.s6_addr16[0] = htons(0xfe80); 3262 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3263 3264 if (!collision && !nohisaddr) { 3265 /* no collision, hisaddr known - Conf-Ack */ 3266 type = CONF_ACK; 3267 3268 if (debug) { 3269 addlog(" %s [%s]", 3270 ip6_sprintf(&desiredaddr), 3271 sppp_cp_type_name(type)); 3272 } 3273 continue; 3274 } 3275 3276 memset(&suggestaddr, 0, sizeof(&suggestaddr)); 3277 if (collision && nohisaddr) { 3278 /* collision, hisaddr unknown - Conf-Rej */ 3279 type = CONF_REJ; 3280 memset(&p[2], 0, 8); 3281 } else { 3282 /* 3283 * - no collision, hisaddr unknown, or 3284 * - collision, hisaddr known 3285 * Conf-Nak, suggest hisaddr 3286 */ 3287 type = CONF_NAK; 3288 sppp_suggest_ip6_addr(sp, &suggestaddr); 3289 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3290 } 3291 if (debug) 3292 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3293 sppp_cp_type_name(type)); 3294 break; 3295 } 3296 /* Add the option to nak'ed list. */ 3297 bcopy (p, r, p[1]); 3298 r += p[1]; 3299 rlen += p[1]; 3300 } 3301 3302 if (rlen == 0 && type == CONF_ACK) { 3303 if (debug) 3304 addlog(" send %s\n", sppp_cp_type_name(type)); 3305 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1); 3306 } else { 3307 #ifdef DIAGNOSTIC 3308 if (type == CONF_ACK) 3309 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3310 #endif 3311 3312 if (debug) { 3313 addlog(" send %s suggest %s\n", 3314 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3315 } 3316 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3317 } 3318 3319 end: 3320 free (buf, M_TEMP); 3321 return (rlen == 0); 3322 } 3323 3324 /* 3325 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3326 * negotiation. 3327 */ 3328 static void 3329 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3330 { 3331 u_char *buf, *p; 3332 struct ifnet *ifp = &sp->pp_if; 3333 int debug = ifp->if_flags & IFF_DEBUG; 3334 3335 len -= 4; 3336 buf = malloc (len, M_TEMP, M_NOWAIT); 3337 if (!buf) 3338 return; 3339 3340 if (debug) 3341 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:", 3342 SPP_ARGS(ifp)); 3343 3344 p = (void*) (h+1); 3345 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3346 if (debug) 3347 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3348 switch (*p) { 3349 case IPV6CP_OPT_IFID: 3350 /* 3351 * Peer doesn't grok address option. This is 3352 * bad. XXX Should we better give up here? 3353 */ 3354 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3355 break; 3356 #ifdef notyet 3357 case IPV6CP_OPT_COMPRESS: 3358 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3359 break; 3360 #endif 3361 } 3362 } 3363 if (debug) 3364 addlog("\n"); 3365 free (buf, M_TEMP); 3366 return; 3367 } 3368 3369 /* 3370 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3371 * negotiation. 3372 */ 3373 static void 3374 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3375 { 3376 u_char *buf, *p; 3377 struct ifnet *ifp = &sp->pp_if; 3378 int debug = ifp->if_flags & IFF_DEBUG; 3379 struct in6_addr suggestaddr; 3380 3381 len -= 4; 3382 buf = malloc (len, M_TEMP, M_NOWAIT); 3383 if (!buf) 3384 return; 3385 3386 if (debug) 3387 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:", 3388 SPP_ARGS(ifp)); 3389 3390 p = (void*) (h+1); 3391 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3392 if (debug) 3393 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3394 switch (*p) { 3395 case IPV6CP_OPT_IFID: 3396 /* 3397 * Peer doesn't like our local ifid. See 3398 * if we can do something for him. We'll drop 3399 * him our address then. 3400 */ 3401 if (len < 10 || p[1] != 10) 3402 break; 3403 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3404 suggestaddr.s6_addr16[0] = htons(0xfe80); 3405 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3406 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3407 3408 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3409 if (debug) 3410 addlog(" [suggestaddr %s]", 3411 ip6_sprintf(&suggestaddr)); 3412 #ifdef IPV6CP_MYIFID_DYN 3413 /* 3414 * When doing dynamic address assignment, 3415 * we accept his offer. 3416 */ 3417 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3418 struct in6_addr lastsuggest; 3419 /* 3420 * If <suggested myaddr from peer> equals to 3421 * <hisaddr we have suggested last time>, 3422 * we have a collision. generate new random 3423 * ifid. 3424 */ 3425 sppp_suggest_ip6_addr(&lastsuggest); 3426 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3427 lastsuggest)) { 3428 if (debug) 3429 addlog(" [random]"); 3430 sppp_gen_ip6_addr(sp, &suggestaddr); 3431 } 3432 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3433 if (debug) 3434 addlog(" [agree]"); 3435 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3436 } 3437 #else 3438 /* 3439 * Since we do not do dynamic address assignment, 3440 * we ignore it and thus continue to negotiate 3441 * our already existing value. This can possibly 3442 * go into infinite request-reject loop. 3443 * 3444 * This is not likely because we normally use 3445 * ifid based on MAC-address. 3446 * If you have no ethernet card on the node, too bad. 3447 * XXX should we use fail_counter? 3448 */ 3449 #endif 3450 break; 3451 #ifdef notyet 3452 case IPV6CP_OPT_COMPRESS: 3453 /* 3454 * Peer wants different compression parameters. 3455 */ 3456 break; 3457 #endif 3458 } 3459 } 3460 if (debug) 3461 addlog("\n"); 3462 free (buf, M_TEMP); 3463 return; 3464 } 3465 3466 static void 3467 sppp_ipv6cp_tlu(struct sppp *sp) 3468 { 3469 /* we are up - notify isdn daemon */ 3470 if (sp->pp_con) 3471 sp->pp_con(sp); 3472 } 3473 3474 static void 3475 sppp_ipv6cp_tld(struct sppp *sp) 3476 { 3477 } 3478 3479 static void 3480 sppp_ipv6cp_tls(struct sppp *sp) 3481 { 3482 /* indicate to LCP that it must stay alive */ 3483 sp->lcp.protos |= (1 << IDX_IPV6CP); 3484 } 3485 3486 static void 3487 sppp_ipv6cp_tlf(struct sppp *sp) 3488 { 3489 /* we no longer need LCP */ 3490 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3491 } 3492 3493 static void 3494 sppp_ipv6cp_scr(struct sppp *sp) 3495 { 3496 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3497 struct in6_addr ouraddr; 3498 int i = 0; 3499 3500 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3501 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3502 opt[i++] = IPV6CP_OPT_IFID; 3503 opt[i++] = 10; 3504 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3505 i += 8; 3506 } 3507 3508 #ifdef notyet 3509 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3510 opt[i++] = IPV6CP_OPT_COMPRESSION; 3511 opt[i++] = 4; 3512 opt[i++] = 0; /* TBD */ 3513 opt[i++] = 0; /* TBD */ 3514 /* variable length data may follow */ 3515 } 3516 #endif 3517 3518 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3519 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3520 } 3521 #else /*INET6*/ 3522 static void sppp_ipv6cp_init(struct sppp *sp) 3523 { 3524 } 3525 3526 static void sppp_ipv6cp_up(struct sppp *sp) 3527 { 3528 } 3529 3530 static void sppp_ipv6cp_down(struct sppp *sp) 3531 { 3532 } 3533 3534 3535 static void sppp_ipv6cp_open(struct sppp *sp) 3536 { 3537 } 3538 3539 static void sppp_ipv6cp_close(struct sppp *sp) 3540 { 3541 } 3542 3543 static void sppp_ipv6cp_TO(void *sp) 3544 { 3545 } 3546 3547 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3548 { 3549 return 0; 3550 } 3551 3552 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3553 { 3554 } 3555 3556 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3557 { 3558 } 3559 3560 static void sppp_ipv6cp_tlu(struct sppp *sp) 3561 { 3562 } 3563 3564 static void sppp_ipv6cp_tld(struct sppp *sp) 3565 { 3566 } 3567 3568 static void sppp_ipv6cp_tls(struct sppp *sp) 3569 { 3570 } 3571 3572 static void sppp_ipv6cp_tlf(struct sppp *sp) 3573 { 3574 } 3575 3576 static void sppp_ipv6cp_scr(struct sppp *sp) 3577 { 3578 } 3579 #endif /*INET6*/ 3580 3581 3582 /* 3584 *--------------------------------------------------------------------------* 3585 * * 3586 * The CHAP implementation. * 3587 * * 3588 *--------------------------------------------------------------------------* 3589 */ 3590 3591 /* 3592 * The authentication protocols don't employ a full-fledged state machine as 3593 * the control protocols do, since they do have Open and Close events, but 3594 * not Up and Down, nor are they explicitly terminated. Also, use of the 3595 * authentication protocols may be different in both directions (this makes 3596 * sense, think of a machine that never accepts incoming calls but only 3597 * calls out, it doesn't require the called party to authenticate itself). 3598 * 3599 * Our state machine for the local authentication protocol (we are requesting 3600 * the peer to authenticate) looks like: 3601 * 3602 * RCA- 3603 * +--------------------------------------------+ 3604 * V scn,tld| 3605 * +--------+ Close +---------+ RCA+ 3606 * | |<----------------------------------| |------+ 3607 * +--->| Closed | TO* | Opened | sca | 3608 * | | |-----+ +-------| |<-----+ 3609 * | +--------+ irc | | +---------+ 3610 * | ^ | | ^ 3611 * | | | | | 3612 * | | | | | 3613 * | TO-| | | | 3614 * | |tld TO+ V | | 3615 * | | +------->+ | | 3616 * | | | | | | 3617 * | +--------+ V | | 3618 * | | |<----+<--------------------+ | 3619 * | | Req- | scr | 3620 * | | Sent | | 3621 * | | | | 3622 * | +--------+ | 3623 * | RCA- | | RCA+ | 3624 * +------+ +------------------------------------------+ 3625 * scn,tld sca,irc,ict,tlu 3626 * 3627 * 3628 * with: 3629 * 3630 * Open: LCP reached authentication phase 3631 * Close: LCP reached terminate phase 3632 * 3633 * RCA+: received reply (pap-req, chap-response), acceptable 3634 * RCN: received reply (pap-req, chap-response), not acceptable 3635 * TO+: timeout with restart counter >= 0 3636 * TO-: timeout with restart counter < 0 3637 * TO*: reschedule timeout for CHAP 3638 * 3639 * scr: send request packet (none for PAP, chap-challenge) 3640 * sca: send ack packet (pap-ack, chap-success) 3641 * scn: send nak packet (pap-nak, chap-failure) 3642 * ict: initialize re-challenge timer (CHAP only) 3643 * 3644 * tlu: this-layer-up, LCP reaches network phase 3645 * tld: this-layer-down, LCP enters terminate phase 3646 * 3647 * Note that in CHAP mode, after sending a new challenge, while the state 3648 * automaton falls back into Req-Sent state, it doesn't signal a tld 3649 * event to LCP, so LCP remains in network phase. Only after not getting 3650 * any response (or after getting an unacceptable response), CHAP closes, 3651 * causing LCP to enter terminate phase. 3652 * 3653 * With PAP, there is no initial request that can be sent. The peer is 3654 * expected to send one based on the successful negotiation of PAP as 3655 * the authentication protocol during the LCP option negotiation. 3656 * 3657 * Incoming authentication protocol requests (remote requests 3658 * authentication, we are peer) don't employ a state machine at all, 3659 * they are simply answered. Some peers [Ascend P50 firmware rev 3660 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3661 * still in authentication phase (thereby violating the standard that 3662 * demands that these NCP packets are to be discarded), so we keep 3663 * track of the peer demanding us to authenticate, and only proceed to 3664 * phase network once we've seen a positive acknowledge for the 3665 * authentication. 3666 */ 3667 3668 /* 3669 * Handle incoming CHAP packets. 3670 */ 3671 void 3672 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3673 { 3674 STDDCL; 3675 struct lcp_header *h; 3676 int len, x; 3677 u_char *value, *name, digest[AUTHKEYLEN], dsize; 3678 int value_len, name_len; 3679 MD5_CTX ctx; 3680 3681 len = m->m_pkthdr.len; 3682 if (len < 4) { 3683 if (debug) 3684 log(LOG_DEBUG, 3685 SPP_FMT "chap invalid packet length: %d bytes\n", 3686 SPP_ARGS(ifp), len); 3687 return; 3688 } 3689 h = mtod (m, struct lcp_header*); 3690 if (len > ntohs (h->len)) 3691 len = ntohs (h->len); 3692 3693 switch (h->type) { 3694 /* challenge, failure and success are his authproto */ 3695 case CHAP_CHALLENGE: 3696 value = 1 + (u_char*)(h+1); 3697 value_len = value[-1]; 3698 name = value + value_len; 3699 name_len = len - value_len - 5; 3700 if (name_len < 0) { 3701 if (debug) { 3702 log(LOG_DEBUG, 3703 SPP_FMT "chap corrupted challenge " 3704 "<%s id=0x%x len=%d", 3705 SPP_ARGS(ifp), 3706 sppp_auth_type_name(PPP_CHAP, h->type), 3707 h->ident, ntohs(h->len)); 3708 if (len > 4) 3709 sppp_print_bytes((u_char*) (h+1), len-4); 3710 addlog(">\n"); 3711 } 3712 break; 3713 } 3714 3715 if (debug) { 3716 log(LOG_DEBUG, 3717 SPP_FMT "chap input <%s id=0x%x len=%d name=", 3718 SPP_ARGS(ifp), 3719 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3720 ntohs(h->len)); 3721 sppp_print_string((char*) name, name_len); 3722 addlog(" value-size=%d value=", value_len); 3723 sppp_print_bytes(value, value_len); 3724 addlog(">\n"); 3725 } 3726 3727 /* Compute reply value. */ 3728 MD5Init(&ctx); 3729 MD5Update(&ctx, &h->ident, 1); 3730 MD5Update(&ctx, sp->myauth.secret, 3731 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN)); 3732 MD5Update(&ctx, value, value_len); 3733 MD5Final(digest, &ctx); 3734 dsize = sizeof digest; 3735 3736 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3737 sizeof dsize, (const char *)&dsize, 3738 sizeof digest, digest, 3739 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 3740 sp->myauth.name, 3741 0); 3742 break; 3743 3744 case CHAP_SUCCESS: 3745 if (debug) { 3746 log(LOG_DEBUG, SPP_FMT "chap success", 3747 SPP_ARGS(ifp)); 3748 if (len > 4) { 3749 addlog(": "); 3750 sppp_print_string((char*)(h + 1), len - 4); 3751 } 3752 addlog("\n"); 3753 } 3754 x = splnet(); 3755 sp->pp_flags &= ~PP_NEEDAUTH; 3756 if (sp->myauth.proto == PPP_CHAP && 3757 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3758 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3759 /* 3760 * We are authenticator for CHAP but didn't 3761 * complete yet. Leave it to tlu to proceed 3762 * to network phase. 3763 */ 3764 splx(x); 3765 break; 3766 } 3767 splx(x); 3768 sppp_phase_network(sp); 3769 break; 3770 3771 case CHAP_FAILURE: 3772 if (debug) { 3773 log(LOG_INFO, SPP_FMT "chap failure", 3774 SPP_ARGS(ifp)); 3775 if (len > 4) { 3776 addlog(": "); 3777 sppp_print_string((char*)(h + 1), len - 4); 3778 } 3779 addlog("\n"); 3780 } else 3781 log(LOG_INFO, SPP_FMT "chap failure\n", 3782 SPP_ARGS(ifp)); 3783 /* await LCP shutdown by authenticator */ 3784 break; 3785 3786 /* response is my authproto */ 3787 case CHAP_RESPONSE: 3788 value = 1 + (u_char*)(h+1); 3789 value_len = value[-1]; 3790 name = value + value_len; 3791 name_len = len - value_len - 5; 3792 if (name_len < 0) { 3793 if (debug) { 3794 log(LOG_DEBUG, 3795 SPP_FMT "chap corrupted response " 3796 "<%s id=0x%x len=%d", 3797 SPP_ARGS(ifp), 3798 sppp_auth_type_name(PPP_CHAP, h->type), 3799 h->ident, ntohs(h->len)); 3800 if (len > 4) 3801 sppp_print_bytes((u_char*)(h+1), len-4); 3802 addlog(">\n"); 3803 } 3804 break; 3805 } 3806 if (h->ident != sp->confid[IDX_CHAP]) { 3807 if (debug) 3808 log(LOG_DEBUG, 3809 SPP_FMT "chap dropping response for old ID " 3810 "(got %d, expected %d)\n", 3811 SPP_ARGS(ifp), 3812 h->ident, sp->confid[IDX_CHAP]); 3813 break; 3814 } 3815 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) 3816 || bcmp(name, sp->hisauth.name, name_len) != 0) { 3817 log(LOG_INFO, SPP_FMT "chap response, his name ", 3818 SPP_ARGS(ifp)); 3819 sppp_print_string(name, name_len); 3820 addlog(" != expected "); 3821 sppp_print_string(sp->hisauth.name, 3822 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)); 3823 addlog("\n"); 3824 } 3825 if (debug) { 3826 log(LOG_DEBUG, SPP_FMT "chap input(%s) " 3827 "<%s id=0x%x len=%d name=", 3828 SPP_ARGS(ifp), 3829 sppp_state_name(sp->state[IDX_CHAP]), 3830 sppp_auth_type_name(PPP_CHAP, h->type), 3831 h->ident, ntohs (h->len)); 3832 sppp_print_string((char*)name, name_len); 3833 addlog(" value-size=%d value=", value_len); 3834 sppp_print_bytes(value, value_len); 3835 addlog(">\n"); 3836 } 3837 if (value_len != AUTHKEYLEN) { 3838 if (debug) 3839 log(LOG_DEBUG, 3840 SPP_FMT "chap bad hash value length: " 3841 "%d bytes, should be %d\n", 3842 SPP_ARGS(ifp), value_len, 3843 AUTHKEYLEN); 3844 break; 3845 } 3846 3847 MD5Init(&ctx); 3848 MD5Update(&ctx, &h->ident, 1); 3849 MD5Update(&ctx, sp->hisauth.secret, 3850 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN)); 3851 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN); 3852 MD5Final(digest, &ctx); 3853 3854 #define FAILMSG "Failed..." 3855 #define SUCCMSG "Welcome!" 3856 3857 if (value_len != sizeof digest || 3858 bcmp(digest, value, value_len) != 0) { 3859 /* action scn, tld */ 3860 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 3861 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 3862 0); 3863 chap.tld(sp); 3864 break; 3865 } 3866 /* action sca, perhaps tlu */ 3867 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 3868 sp->state[IDX_CHAP] == STATE_OPENED) 3869 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 3870 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 3871 0); 3872 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 3873 sppp_cp_change_state(&chap, sp, STATE_OPENED); 3874 chap.tlu(sp); 3875 } 3876 break; 3877 3878 default: 3879 /* Unknown CHAP packet type -- ignore. */ 3880 if (debug) { 3881 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) " 3882 "<0x%x id=0x%xh len=%d", 3883 SPP_ARGS(ifp), 3884 sppp_state_name(sp->state[IDX_CHAP]), 3885 h->type, h->ident, ntohs(h->len)); 3886 if (len > 4) 3887 sppp_print_bytes((u_char*)(h+1), len-4); 3888 addlog(">\n"); 3889 } 3890 break; 3891 3892 } 3893 } 3894 3895 static void 3896 sppp_chap_init(struct sppp *sp) 3897 { 3898 /* Chap doesn't have STATE_INITIAL at all. */ 3899 sp->state[IDX_CHAP] = STATE_CLOSED; 3900 sp->fail_counter[IDX_CHAP] = 0; 3901 sp->pp_seq[IDX_CHAP] = 0; 3902 sp->pp_rseq[IDX_CHAP] = 0; 3903 callout_init(&sp->ch[IDX_CHAP]); 3904 } 3905 3906 static void 3907 sppp_chap_open(struct sppp *sp) 3908 { 3909 if (sp->myauth.proto == PPP_CHAP && 3910 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 3911 /* we are authenticator for CHAP, start it */ 3912 chap.scr(sp); 3913 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3914 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3915 } 3916 /* nothing to be done if we are peer, await a challenge */ 3917 } 3918 3919 static void 3920 sppp_chap_close(struct sppp *sp) 3921 { 3922 if (sp->state[IDX_CHAP] != STATE_CLOSED) 3923 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3924 } 3925 3926 static void 3927 sppp_chap_TO(void *cookie) 3928 { 3929 struct sppp *sp = (struct sppp *)cookie; 3930 STDDCL; 3931 int s; 3932 3933 s = splnet(); 3934 if (debug) 3935 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n", 3936 SPP_ARGS(ifp), 3937 sppp_state_name(sp->state[IDX_CHAP]), 3938 sp->rst_counter[IDX_CHAP]); 3939 3940 if (--sp->rst_counter[IDX_CHAP] < 0) 3941 /* TO- event */ 3942 switch (sp->state[IDX_CHAP]) { 3943 case STATE_REQ_SENT: 3944 chap.tld(sp); 3945 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3946 break; 3947 } 3948 else 3949 /* TO+ (or TO*) event */ 3950 switch (sp->state[IDX_CHAP]) { 3951 case STATE_OPENED: 3952 /* TO* event */ 3953 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3954 /* fall through */ 3955 case STATE_REQ_SENT: 3956 chap.scr(sp); 3957 /* sppp_cp_change_state() will restart the timer */ 3958 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3959 break; 3960 } 3961 3962 splx(s); 3963 } 3964 3965 static void 3966 sppp_chap_tlu(struct sppp *sp) 3967 { 3968 STDDCL; 3969 int i, x; 3970 3971 i = 0; 3972 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3973 3974 /* 3975 * Some broken CHAP implementations (Conware CoNet, firmware 3976 * 4.0.?) don't want to re-authenticate their CHAP once the 3977 * initial challenge-response exchange has taken place. 3978 * Provide for an option to avoid rechallenges. 3979 */ 3980 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) { 3981 /* 3982 * Compute the re-challenge timeout. This will yield 3983 * a number between 300 and 810 seconds. 3984 */ 3985 i = 300 + ((unsigned)(random() & 0xff00) >> 7); 3986 3987 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 3988 } 3989 3990 if (debug) { 3991 log(LOG_DEBUG, 3992 SPP_FMT "chap %s, ", 3993 SPP_ARGS(ifp), 3994 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu"); 3995 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) 3996 addlog("next re-challenge in %d seconds\n", i); 3997 else 3998 addlog("re-challenging supressed\n"); 3999 } 4000 4001 x = splnet(); 4002 /* indicate to LCP that we need to be closed down */ 4003 sp->lcp.protos |= (1 << IDX_CHAP); 4004 4005 if (sp->pp_flags & PP_NEEDAUTH) { 4006 /* 4007 * Remote is authenticator, but his auth proto didn't 4008 * complete yet. Defer the transition to network 4009 * phase. 4010 */ 4011 splx(x); 4012 return; 4013 } 4014 splx(x); 4015 4016 /* 4017 * If we are already in phase network, we are done here. This 4018 * is the case if this is a dummy tlu event after a re-challenge. 4019 */ 4020 if (sp->pp_phase != PHASE_NETWORK) 4021 sppp_phase_network(sp); 4022 } 4023 4024 static void 4025 sppp_chap_tld(struct sppp *sp) 4026 { 4027 STDDCL; 4028 4029 if (debug) 4030 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp)); 4031 callout_stop(&sp->ch[IDX_CHAP]); 4032 sp->lcp.protos &= ~(1 << IDX_CHAP); 4033 4034 lcp.Close(sp); 4035 } 4036 4037 static void 4038 sppp_chap_scr(struct sppp *sp) 4039 { 4040 struct timeval tv; 4041 u_int32_t *ch, seed; 4042 u_char clen; 4043 4044 /* Compute random challenge. */ 4045 ch = (u_int32_t *)sp->myauth.challenge; 4046 microtime(&tv); 4047 seed = tv.tv_sec ^ tv.tv_usec; 4048 ch[0] = seed ^ random(); 4049 ch[1] = seed ^ random(); 4050 ch[2] = seed ^ random(); 4051 ch[3] = seed ^ random(); 4052 clen = AUTHKEYLEN; 4053 4054 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4055 4056 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4057 sizeof clen, (const char *)&clen, 4058 (size_t)AUTHKEYLEN, sp->myauth.challenge, 4059 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 4060 sp->myauth.name, 4061 0); 4062 } 4063 /* 4065 *--------------------------------------------------------------------------* 4066 * * 4067 * The PAP implementation. * 4068 * * 4069 *--------------------------------------------------------------------------* 4070 */ 4071 /* 4072 * For PAP, we need to keep a little state also if we are the peer, not the 4073 * authenticator. This is since we don't get a request to authenticate, but 4074 * have to repeatedly authenticate ourself until we got a response (or the 4075 * retry counter is expired). 4076 */ 4077 4078 /* 4079 * Handle incoming PAP packets. */ 4080 static void 4081 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4082 { 4083 STDDCL; 4084 struct lcp_header *h; 4085 int len, x; 4086 u_char *name, *passwd, mlen; 4087 int name_len, passwd_len; 4088 4089 len = m->m_pkthdr.len; 4090 if (len < 5) { 4091 if (debug) 4092 log(LOG_DEBUG, 4093 SPP_FMT "pap invalid packet length: %d bytes\n", 4094 SPP_ARGS(ifp), len); 4095 return; 4096 } 4097 h = mtod (m, struct lcp_header*); 4098 if (len > ntohs (h->len)) 4099 len = ntohs (h->len); 4100 switch (h->type) { 4101 /* PAP request is my authproto */ 4102 case PAP_REQ: 4103 name = 1 + (u_char*)(h+1); 4104 name_len = name[-1]; 4105 passwd = name + name_len + 1; 4106 if (name_len > len - 6 || 4107 (passwd_len = passwd[-1]) > len - 6 - name_len) { 4108 if (debug) { 4109 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4110 "<%s id=0x%x len=%d", 4111 SPP_ARGS(ifp), 4112 sppp_auth_type_name(PPP_PAP, h->type), 4113 h->ident, ntohs(h->len)); 4114 if (len > 4) 4115 sppp_print_bytes((u_char*)(h+1), len-4); 4116 addlog(">\n"); 4117 } 4118 break; 4119 } 4120 if (debug) { 4121 log(LOG_DEBUG, SPP_FMT "pap input(%s) " 4122 "<%s id=0x%x len=%d name=", 4123 SPP_ARGS(ifp), 4124 sppp_state_name(sp->state[IDX_PAP]), 4125 sppp_auth_type_name(PPP_PAP, h->type), 4126 h->ident, ntohs(h->len)); 4127 sppp_print_string((char*)name, name_len); 4128 addlog(" passwd="); 4129 sppp_print_string((char*)passwd, passwd_len); 4130 addlog(">\n"); 4131 } 4132 if (name_len > AUTHNAMELEN || 4133 passwd_len > AUTHKEYLEN || 4134 bcmp(name, sp->hisauth.name, name_len) != 0 || 4135 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) { 4136 /* action scn, tld */ 4137 mlen = sizeof(FAILMSG) - 1; 4138 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4139 sizeof mlen, (const char *)&mlen, 4140 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4141 0); 4142 pap.tld(sp); 4143 break; 4144 } 4145 /* action sca, perhaps tlu */ 4146 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4147 sp->state[IDX_PAP] == STATE_OPENED) { 4148 mlen = sizeof(SUCCMSG) - 1; 4149 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4150 sizeof mlen, (const char *)&mlen, 4151 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4152 0); 4153 } 4154 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4155 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4156 pap.tlu(sp); 4157 } 4158 break; 4159 4160 /* ack and nak are his authproto */ 4161 case PAP_ACK: 4162 callout_stop(&sp->pap_my_to_ch); 4163 if (debug) { 4164 log(LOG_DEBUG, SPP_FMT "pap success", 4165 SPP_ARGS(ifp)); 4166 name_len = *(char *)h; 4167 if (len > 5 && name_len) { 4168 addlog(": "); 4169 sppp_print_string((char*)(h+1), name_len); 4170 } 4171 addlog("\n"); 4172 } 4173 x = splnet(); 4174 sp->pp_flags &= ~PP_NEEDAUTH; 4175 if (sp->myauth.proto == PPP_PAP && 4176 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4177 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4178 /* 4179 * We are authenticator for PAP but didn't 4180 * complete yet. Leave it to tlu to proceed 4181 * to network phase. 4182 */ 4183 splx(x); 4184 break; 4185 } 4186 splx(x); 4187 sppp_phase_network(sp); 4188 break; 4189 4190 case PAP_NAK: 4191 callout_stop(&sp->pap_my_to_ch); 4192 if (debug) { 4193 log(LOG_INFO, SPP_FMT "pap failure", 4194 SPP_ARGS(ifp)); 4195 name_len = *(char *)h; 4196 if (len > 5 && name_len) { 4197 addlog(": "); 4198 sppp_print_string((char*)(h+1), name_len); 4199 } 4200 addlog("\n"); 4201 } else 4202 log(LOG_INFO, SPP_FMT "pap failure\n", 4203 SPP_ARGS(ifp)); 4204 /* await LCP shutdown by authenticator */ 4205 break; 4206 4207 default: 4208 /* Unknown PAP packet type -- ignore. */ 4209 if (debug) { 4210 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4211 "<0x%x id=0x%x len=%d", 4212 SPP_ARGS(ifp), 4213 h->type, h->ident, ntohs(h->len)); 4214 if (len > 4) 4215 sppp_print_bytes((u_char*)(h+1), len-4); 4216 addlog(">\n"); 4217 } 4218 break; 4219 4220 } 4221 } 4222 4223 static void 4224 sppp_pap_init(struct sppp *sp) 4225 { 4226 /* PAP doesn't have STATE_INITIAL at all. */ 4227 sp->state[IDX_PAP] = STATE_CLOSED; 4228 sp->fail_counter[IDX_PAP] = 0; 4229 sp->pp_seq[IDX_PAP] = 0; 4230 sp->pp_rseq[IDX_PAP] = 0; 4231 callout_init(&sp->ch[IDX_PAP]); 4232 callout_init(&sp->pap_my_to_ch); 4233 } 4234 4235 static void 4236 sppp_pap_open(struct sppp *sp) 4237 { 4238 if (sp->hisauth.proto == PPP_PAP && 4239 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4240 /* we are authenticator for PAP, start our timer */ 4241 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4242 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4243 } 4244 if (sp->myauth.proto == PPP_PAP) { 4245 /* we are peer, send a request, and start a timer */ 4246 pap.scr(sp); 4247 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4248 sppp_pap_my_TO, sp); 4249 } 4250 } 4251 4252 static void 4253 sppp_pap_close(struct sppp *sp) 4254 { 4255 if (sp->state[IDX_PAP] != STATE_CLOSED) 4256 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4257 } 4258 4259 /* 4260 * That's the timeout routine if we are authenticator. Since the 4261 * authenticator is basically passive in PAP, we can't do much here. 4262 */ 4263 static void 4264 sppp_pap_TO(void *cookie) 4265 { 4266 struct sppp *sp = (struct sppp *)cookie; 4267 STDDCL; 4268 int s; 4269 4270 s = splnet(); 4271 if (debug) 4272 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n", 4273 SPP_ARGS(ifp), 4274 sppp_state_name(sp->state[IDX_PAP]), 4275 sp->rst_counter[IDX_PAP]); 4276 4277 if (--sp->rst_counter[IDX_PAP] < 0) 4278 /* TO- event */ 4279 switch (sp->state[IDX_PAP]) { 4280 case STATE_REQ_SENT: 4281 pap.tld(sp); 4282 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4283 break; 4284 } 4285 else 4286 /* TO+ event, not very much we could do */ 4287 switch (sp->state[IDX_PAP]) { 4288 case STATE_REQ_SENT: 4289 /* sppp_cp_change_state() will restart the timer */ 4290 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4291 break; 4292 } 4293 4294 splx(s); 4295 } 4296 4297 /* 4298 * That's the timeout handler if we are peer. Since the peer is active, 4299 * we need to retransmit our PAP request since it is apparently lost. 4300 * XXX We should impose a max counter. 4301 */ 4302 static void 4303 sppp_pap_my_TO(void *cookie) 4304 { 4305 struct sppp *sp = (struct sppp *)cookie; 4306 STDDCL; 4307 4308 if (debug) 4309 log(LOG_DEBUG, SPP_FMT "pap peer TO\n", 4310 SPP_ARGS(ifp)); 4311 4312 pap.scr(sp); 4313 } 4314 4315 static void 4316 sppp_pap_tlu(struct sppp *sp) 4317 { 4318 STDDCL; 4319 int x; 4320 4321 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4322 4323 if (debug) 4324 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 4325 SPP_ARGS(ifp), pap.name); 4326 4327 x = splnet(); 4328 /* indicate to LCP that we need to be closed down */ 4329 sp->lcp.protos |= (1 << IDX_PAP); 4330 4331 if (sp->pp_flags & PP_NEEDAUTH) { 4332 /* 4333 * Remote is authenticator, but his auth proto didn't 4334 * complete yet. Defer the transition to network 4335 * phase. 4336 */ 4337 splx(x); 4338 return; 4339 } 4340 splx(x); 4341 sppp_phase_network(sp); 4342 } 4343 4344 static void 4345 sppp_pap_tld(struct sppp *sp) 4346 { 4347 STDDCL; 4348 4349 if (debug) 4350 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp)); 4351 callout_stop(&sp->ch[IDX_PAP]); 4352 callout_stop(&sp->pap_my_to_ch); 4353 sp->lcp.protos &= ~(1 << IDX_PAP); 4354 4355 lcp.Close(sp); 4356 } 4357 4358 static void 4359 sppp_pap_scr(struct sppp *sp) 4360 { 4361 u_char idlen, pwdlen; 4362 4363 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4364 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN); 4365 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN); 4366 4367 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4368 sizeof idlen, (const char *)&idlen, 4369 (size_t)idlen, sp->myauth.name, 4370 sizeof pwdlen, (const char *)&pwdlen, 4371 (size_t)pwdlen, sp->myauth.secret, 4372 0); 4373 } 4374 /* 4376 * Random miscellaneous functions. 4377 */ 4378 4379 /* 4380 * Send a PAP or CHAP proto packet. 4381 * 4382 * Varadic function, each of the elements for the ellipsis is of type 4383 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4384 * mlen == 0. 4385 * NOTE: never declare variadic functions with types subject to type 4386 * promotion (i.e. u_char). This is asking for big trouble depending 4387 * on the architecture you are on... 4388 */ 4389 4390 static void 4391 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4392 unsigned int type, unsigned int id, 4393 ...) 4394 { 4395 STDDCL; 4396 struct lcp_header *lh; 4397 struct mbuf *m; 4398 u_char *p; 4399 int len; 4400 size_t pkthdrlen; 4401 unsigned int mlen; 4402 const char *msg; 4403 va_list ap; 4404 4405 MGETHDR (m, M_DONTWAIT, MT_DATA); 4406 if (! m) 4407 return; 4408 m->m_pkthdr.rcvif = 0; 4409 4410 if (sp->pp_flags & PP_NOFRAMING) { 4411 *mtod(m, u_int16_t*) = htons(cp->proto); 4412 pkthdrlen = 2; 4413 lh = (struct lcp_header*)(mtod(m, u_int8_t*)+2); 4414 } else { 4415 struct ppp_header *h; 4416 h = mtod (m, struct ppp_header*); 4417 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4418 h->control = PPP_UI; /* Unnumbered Info */ 4419 h->protocol = htons(cp->proto); 4420 pkthdrlen = PPP_HEADER_LEN; 4421 4422 lh = (struct lcp_header*)(h + 1); 4423 } 4424 4425 lh->type = type; 4426 lh->ident = id; 4427 p = (u_char*) (lh+1); 4428 4429 va_start(ap, id); 4430 len = 0; 4431 4432 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4433 msg = va_arg(ap, const char *); 4434 len += mlen; 4435 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4436 va_end(ap); 4437 m_freem(m); 4438 return; 4439 } 4440 4441 bcopy(msg, p, mlen); 4442 p += mlen; 4443 } 4444 va_end(ap); 4445 4446 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4447 lh->len = htons (LCP_HEADER_LEN + len); 4448 4449 if (debug) { 4450 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 4451 SPP_ARGS(ifp), cp->name, 4452 sppp_auth_type_name(cp->proto, lh->type), 4453 lh->ident, ntohs(lh->len)); 4454 if (len) 4455 sppp_print_bytes((u_char*) (lh+1), len); 4456 addlog(">\n"); 4457 } 4458 if (IF_QFULL (&sp->pp_cpq)) { 4459 IF_DROP (&sp->pp_fastq); 4460 IF_DROP (&ifp->if_snd); 4461 m_freem (m); 4462 ++ifp->if_oerrors; 4463 } else 4464 IF_ENQUEUE (&sp->pp_cpq, m); 4465 if (! (ifp->if_flags & IFF_OACTIVE)) 4466 (*ifp->if_start) (ifp); 4467 ifp->if_obytes += m->m_pkthdr.len + 3; 4468 } 4469 4470 /* 4471 * Send keepalive packets, every 10 seconds. 4472 */ 4473 static void 4474 sppp_keepalive(void *dummy) 4475 { 4476 struct sppp *sp; 4477 int s; 4478 4479 s = splnet(); 4480 for (sp=spppq; sp; sp=sp->pp_next) { 4481 struct ifnet *ifp = &sp->pp_if; 4482 4483 /* Keepalive mode disabled or channel down? */ 4484 if (! (sp->pp_flags & PP_KEEPALIVE) || 4485 ! (ifp->if_flags & IFF_RUNNING)) 4486 continue; 4487 4488 /* No keepalive in PPP mode if LCP not opened yet. */ 4489 if (! (sp->pp_flags & PP_CISCO) && 4490 sp->pp_phase < PHASE_AUTHENTICATE) 4491 continue; 4492 4493 if (sp->pp_alivecnt == MAXALIVECNT) { 4494 /* No keepalive packets got. Stop the interface. */ 4495 printf (SPP_FMT "down\n", SPP_ARGS(ifp)); 4496 if_down (ifp); 4497 IF_PURGE (&sp->pp_cpq); 4498 if (! (sp->pp_flags & PP_CISCO)) { 4499 /* XXX */ 4500 /* Shut down the PPP link. */ 4501 lcp.Down(sp); 4502 /* Initiate negotiation. XXX */ 4503 lcp.Up(sp); 4504 } 4505 } 4506 if (sp->pp_alivecnt <= MAXALIVECNT) 4507 ++sp->pp_alivecnt; 4508 if (sp->pp_flags & PP_CISCO) 4509 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, 4510 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4511 else if (sp->pp_phase >= PHASE_AUTHENTICATE) { 4512 int32_t nmagic = htonl (sp->lcp.magic); 4513 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4514 sppp_cp_send (sp, PPP_LCP, ECHO_REQ, 4515 sp->lcp.echoid, 4, &nmagic); 4516 } 4517 } 4518 splx(s); 4519 callout_reset(&keepalive_ch, hz * 10, sppp_keepalive, NULL); 4520 } 4521 4522 /* 4523 * Get both IP addresses. 4524 */ 4525 static void 4526 sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, u_int32_t *srcmask) 4527 { 4528 struct ifnet *ifp = &sp->pp_if; 4529 struct ifaddr *ifa; 4530 struct sockaddr_in *si, *sm; 4531 u_int32_t ssrc, ddst; 4532 4533 sm = NULL; 4534 ssrc = ddst = 0; 4535 /* 4536 * Pick the first AF_INET address from the list, 4537 * aliases don't make any sense on a p2p link anyway. 4538 */ 4539 si = 0; 4540 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 4541 if (ifa->ifa_addr->sa_family == AF_INET) { 4542 si = (struct sockaddr_in *)ifa->ifa_addr; 4543 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4544 if (si) 4545 break; 4546 } 4547 } 4548 if (ifa) { 4549 if (si && si->sin_addr.s_addr) { 4550 ssrc = si->sin_addr.s_addr; 4551 if (srcmask) 4552 *srcmask = ntohl(sm->sin_addr.s_addr); 4553 } 4554 4555 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4556 if (si && si->sin_addr.s_addr) 4557 ddst = si->sin_addr.s_addr; 4558 } 4559 4560 if (dst) *dst = ntohl(ddst); 4561 if (src) *src = ntohl(ssrc); 4562 } 4563 4564 /* 4565 * Set IP addresses. Must be called at splnet. 4566 * If an address is 0, leave it the way it is. 4567 */ 4568 static void 4569 sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr) 4570 { 4571 STDDCL; 4572 struct ifaddr *ifa; 4573 struct sockaddr_in *si; 4574 struct sockaddr_in *dest; 4575 4576 /* 4577 * Pick the first AF_INET address from the list, 4578 * aliases don't make any sense on a p2p link anyway. 4579 */ 4580 4581 si = 0; 4582 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4583 { 4584 if (ifa->ifa_addr->sa_family == AF_INET) 4585 { 4586 si = (struct sockaddr_in *)ifa->ifa_addr; 4587 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4588 if (si) 4589 break; 4590 } 4591 } 4592 4593 if (ifa && si) 4594 { 4595 int error; 4596 struct sockaddr_in new_sin = *si; 4597 struct sockaddr_in new_dst = *dest; 4598 4599 /* 4600 * Scrub old routes now instead of calling in_ifinit with 4601 * scrub=1, because we may change the dstaddr 4602 * before the call to in_ifinit. 4603 */ 4604 in_ifscrub(ifp, ifatoia(ifa)); 4605 4606 if (myaddr != 0) 4607 new_sin.sin_addr.s_addr = htonl(myaddr); 4608 if (hisaddr != 0) { 4609 new_dst.sin_addr.s_addr = htonl(hisaddr); 4610 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4611 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4612 *dest = new_dst; /* fix dstaddr in place */ 4613 } 4614 } 4615 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4616 if(debug && error) 4617 { 4618 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addrs: in_ifinit " 4619 " failed, error=%d\n", SPP_ARGS(ifp), error); 4620 } 4621 } 4622 } 4623 4624 /* 4625 * Clear IP addresses. Must be called at splnet. 4626 */ 4627 static void 4628 sppp_clear_ip_addrs(struct sppp *sp) 4629 { 4630 struct ifnet *ifp = &sp->pp_if; 4631 struct ifaddr *ifa; 4632 struct sockaddr_in *si; 4633 struct sockaddr_in *dest; 4634 4635 u_int32_t remote; 4636 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4637 remote = sp->ipcp.saved_hisaddr; 4638 else 4639 sppp_get_ip_addrs(sp, 0, &remote, 0); 4640 4641 /* 4642 * Pick the first AF_INET address from the list, 4643 * aliases don't make any sense on a p2p link anyway. 4644 */ 4645 4646 si = 0; 4647 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4648 { 4649 if (ifa->ifa_addr->sa_family == AF_INET) 4650 { 4651 si = (struct sockaddr_in *)ifa->ifa_addr; 4652 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4653 if (si) 4654 break; 4655 } 4656 } 4657 4658 if (ifa && si) 4659 { 4660 struct sockaddr_in new_sin = *si; 4661 4662 in_ifscrub(ifp, ifatoia(ifa)); 4663 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4664 new_sin.sin_addr.s_addr = 0; 4665 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4666 /* replace peer addr in place */ 4667 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4668 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4669 } 4670 } 4671 4672 #ifdef INET6 4673 /* 4674 * Get both IPv6 addresses. 4675 */ 4676 static void 4677 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4678 struct in6_addr *srcmask) 4679 { 4680 struct ifnet *ifp = &sp->pp_if; 4681 struct ifaddr *ifa; 4682 struct sockaddr_in6 *si, *sm; 4683 struct in6_addr ssrc, ddst; 4684 4685 sm = NULL; 4686 memset(&ssrc, 0, sizeof(ssrc)); 4687 memset(&ddst, 0, sizeof(ddst)); 4688 /* 4689 * Pick the first link-local AF_INET6 address from the list, 4690 * aliases don't make any sense on a p2p link anyway. 4691 */ 4692 si = 0; 4693 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4694 if (ifa->ifa_addr->sa_family == AF_INET6) { 4695 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4696 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4697 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4698 break; 4699 } 4700 if (ifa) { 4701 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4702 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 4703 if (srcmask) { 4704 bcopy(&sm->sin6_addr, srcmask, 4705 sizeof(*srcmask)); 4706 } 4707 } 4708 4709 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4710 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4711 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 4712 } 4713 4714 if (dst) 4715 bcopy(&ddst, dst, sizeof(*dst)); 4716 if (src) 4717 bcopy(&ssrc, src, sizeof(*src)); 4718 } 4719 4720 #ifdef IPV6CP_MYIFID_DYN 4721 /* 4722 * Generate random ifid. 4723 */ 4724 static void 4725 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 4726 { 4727 /* TBD */ 4728 } 4729 4730 /* 4731 * Set my IPv6 address. Must be called at splnet. 4732 */ 4733 static void 4734 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 4735 { 4736 STDDCL; 4737 struct ifaddr *ifa; 4738 struct sockaddr_in6 *sin6; 4739 4740 /* 4741 * Pick the first link-local AF_INET6 address from the list, 4742 * aliases don't make any sense on a p2p link anyway. 4743 */ 4744 4745 sin6 = NULL; 4746 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4747 { 4748 if (ifa->ifa_addr->sa_family == AF_INET6) 4749 { 4750 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 4751 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 4752 break; 4753 } 4754 } 4755 4756 if (ifa && sin6) 4757 { 4758 int error; 4759 struct sockaddr_in6 new_sin6 = *sin6; 4760 4761 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 4762 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 4763 if (debug && error) 4764 { 4765 log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit " 4766 " failed, error=%d\n", SPP_ARGS(ifp), error); 4767 } 4768 } 4769 } 4770 #endif 4771 4772 /* 4773 * Suggest a candidate address to be used by peer. 4774 */ 4775 static void 4776 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 4777 { 4778 struct in6_addr myaddr; 4779 struct timeval tv; 4780 4781 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 4782 4783 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 4784 microtime(&tv); 4785 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 4786 myaddr.s6_addr[14] ^= 0xff; 4787 myaddr.s6_addr[15] ^= 0xff; 4788 } else { 4789 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 4790 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 4791 } 4792 if (suggest) 4793 bcopy(&myaddr, suggest, sizeof(myaddr)); 4794 } 4795 #endif /*INET6*/ 4796 4797 static int 4798 sppp_params(struct sppp *sp, int cmd, void *data) 4799 { 4800 struct ifreq *ifr = (struct ifreq *)data; 4801 struct spppreq spr; 4802 4803 #if 0 4804 /* 4805 * ifr->ifr_data is supposed to point to a struct spppreq. 4806 * Check the cmd word first before attempting to fetch all the 4807 * data. 4808 */ 4809 if ((subcmd = fuword(ifr->ifr_data)) == -1) 4810 return EFAULT; 4811 #endif 4812 4813 if (copyin((caddr_t)ifr->ifr_data, &spr, sizeof spr) != 0) 4814 return EFAULT; 4815 4816 switch (spr.cmd) { 4817 case SPPPIOGDEFS: 4818 if (cmd != (int)SIOCGIFGENERIC) 4819 return EINVAL; 4820 /* 4821 * We copy over the entire current state, but clean 4822 * out some of the stuff we don't wanna pass up. 4823 * Remember, SIOCGIFGENERIC is unprotected, and can be 4824 * called by any user. No need to ever get PAP or 4825 * CHAP secrets back to userland anyway. 4826 */ 4827 bcopy(sp, &spr.defs, sizeof(struct sppp)); 4828 memset(spr.defs.myauth.secret, 0, AUTHKEYLEN); 4829 memset(spr.defs.myauth.challenge, 0, AUTHKEYLEN); 4830 memset(spr.defs.hisauth.secret, 0, AUTHKEYLEN); 4831 memset(spr.defs.hisauth.challenge, 0, AUTHKEYLEN); 4832 return copyout(&spr, (caddr_t)ifr->ifr_data, sizeof spr); 4833 4834 case SPPPIOSDEFS: 4835 if (cmd != (int)SIOCSIFGENERIC) 4836 return EINVAL; 4837 /* 4838 * We have a very specific idea of which fields we allow 4839 * being passed back from userland, so to not clobber our 4840 * current state. For one, we only allow setting 4841 * anything if LCP is in dead phase. Once the LCP 4842 * negotiations started, the authentication settings must 4843 * not be changed again. (The administrator can force an 4844 * ifconfig down in order to get LCP back into dead 4845 * phase.) 4846 * 4847 * Also, we only allow for authentication parameters to be 4848 * specified. 4849 * 4850 * XXX Should allow to set or clear pp_flags. 4851 * 4852 * Finally, if the respective authentication protocol to 4853 * be used is set differently than 0, but the secret is 4854 * passed as all zeros, we don't trash the existing secret. 4855 * This allows an administrator to change the system name 4856 * only without clobbering the secret (which he didn't get 4857 * back in a previous SPPPIOGDEFS call). However, the 4858 * secrets are cleared if the authentication protocol is 4859 * reset to 0. 4860 */ 4861 if (sp->pp_phase != PHASE_DEAD) 4862 return EBUSY; 4863 4864 if ((spr.defs.myauth.proto != 0 && spr.defs.myauth.proto != PPP_PAP && 4865 spr.defs.myauth.proto != PPP_CHAP) || 4866 (spr.defs.hisauth.proto != 0 && spr.defs.hisauth.proto != PPP_PAP && 4867 spr.defs.hisauth.proto != PPP_CHAP)) 4868 return EINVAL; 4869 4870 if (spr.defs.myauth.proto == 0) 4871 /* resetting myauth */ 4872 memset(&sp->myauth, 0, sizeof sp->myauth); 4873 else { 4874 /* setting/changing myauth */ 4875 sp->myauth.proto = spr.defs.myauth.proto; 4876 bcopy(spr.defs.myauth.name, sp->myauth.name, AUTHNAMELEN); 4877 if (spr.defs.myauth.secret[0] != '\0') 4878 bcopy(spr.defs.myauth.secret, sp->myauth.secret, 4879 AUTHKEYLEN); 4880 } 4881 if (spr.defs.hisauth.proto == 0) 4882 /* resetting hisauth */ 4883 memset(&sp->hisauth, 0, sizeof sp->hisauth); 4884 else { 4885 /* setting/changing hisauth */ 4886 sp->hisauth.proto = spr.defs.hisauth.proto; 4887 sp->hisauth.flags = spr.defs.hisauth.flags; 4888 bcopy(spr.defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN); 4889 if (spr.defs.hisauth.secret[0] != '\0') 4890 bcopy(spr.defs.hisauth.secret, sp->hisauth.secret, 4891 AUTHKEYLEN); 4892 } 4893 break; 4894 4895 default: 4896 return EINVAL; 4897 } 4898 4899 return 0; 4900 } 4901 4902 static void 4903 sppp_phase_network(struct sppp *sp) 4904 { 4905 STDDCL; 4906 int i; 4907 u_int32_t mask; 4908 4909 sp->pp_phase = PHASE_NETWORK; 4910 4911 if(debug) 4912 { 4913 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 4914 sppp_phase_name(sp->pp_phase)); 4915 } 4916 4917 /* Notify NCPs now. */ 4918 for (i = 0; i < IDX_COUNT; i++) 4919 if ((cps[i])->flags & CP_NCP) 4920 (cps[i])->Open(sp); 4921 4922 /* Send Up events to all NCPs. */ 4923 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 4924 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 4925 (cps[i])->Up(sp); 4926 4927 /* if no NCP is starting, all this was in vain, close down */ 4928 sppp_lcp_check_and_close(sp); 4929 } 4930 4931 4932 static const char * 4933 sppp_cp_type_name(u_char type) 4934 { 4935 static char buf[12]; 4936 switch (type) { 4937 case CONF_REQ: return "conf-req"; 4938 case CONF_ACK: return "conf-ack"; 4939 case CONF_NAK: return "conf-nak"; 4940 case CONF_REJ: return "conf-rej"; 4941 case TERM_REQ: return "term-req"; 4942 case TERM_ACK: return "term-ack"; 4943 case CODE_REJ: return "code-rej"; 4944 case PROTO_REJ: return "proto-rej"; 4945 case ECHO_REQ: return "echo-req"; 4946 case ECHO_REPLY: return "echo-reply"; 4947 case DISC_REQ: return "discard-req"; 4948 } 4949 sprintf (buf, "0x%x", type); 4950 return buf; 4951 } 4952 4953 static const char * 4954 sppp_auth_type_name(u_short proto, u_char type) 4955 { 4956 static char buf[12]; 4957 switch (proto) { 4958 case PPP_CHAP: 4959 switch (type) { 4960 case CHAP_CHALLENGE: return "challenge"; 4961 case CHAP_RESPONSE: return "response"; 4962 case CHAP_SUCCESS: return "success"; 4963 case CHAP_FAILURE: return "failure"; 4964 } 4965 case PPP_PAP: 4966 switch (type) { 4967 case PAP_REQ: return "req"; 4968 case PAP_ACK: return "ack"; 4969 case PAP_NAK: return "nak"; 4970 } 4971 } 4972 sprintf (buf, "0x%x", type); 4973 return buf; 4974 } 4975 4976 static const char * 4977 sppp_lcp_opt_name(u_char opt) 4978 { 4979 static char buf[12]; 4980 switch (opt) { 4981 case LCP_OPT_MRU: return "mru"; 4982 case LCP_OPT_ASYNC_MAP: return "async-map"; 4983 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 4984 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 4985 case LCP_OPT_MAGIC: return "magic"; 4986 case LCP_OPT_PROTO_COMP: return "proto-comp"; 4987 case LCP_OPT_ADDR_COMP: return "addr-comp"; 4988 } 4989 sprintf (buf, "0x%x", opt); 4990 return buf; 4991 } 4992 4993 static const char * 4994 sppp_ipcp_opt_name(u_char opt) 4995 { 4996 static char buf[12]; 4997 switch (opt) { 4998 case IPCP_OPT_ADDRESSES: return "addresses"; 4999 case IPCP_OPT_COMPRESSION: return "compression"; 5000 case IPCP_OPT_ADDRESS: return "address"; 5001 } 5002 sprintf (buf, "0x%x", opt); 5003 return buf; 5004 } 5005 5006 #ifdef INET6 5007 static const char * 5008 sppp_ipv6cp_opt_name(u_char opt) 5009 { 5010 static char buf[12]; 5011 switch (opt) { 5012 case IPV6CP_OPT_IFID: return "ifid"; 5013 case IPV6CP_OPT_COMPRESSION: return "compression"; 5014 } 5015 sprintf (buf, "0x%x", opt); 5016 return buf; 5017 } 5018 #endif 5019 5020 static const char * 5021 sppp_state_name(int state) 5022 { 5023 switch (state) { 5024 case STATE_INITIAL: return "initial"; 5025 case STATE_STARTING: return "starting"; 5026 case STATE_CLOSED: return "closed"; 5027 case STATE_STOPPED: return "stopped"; 5028 case STATE_CLOSING: return "closing"; 5029 case STATE_STOPPING: return "stopping"; 5030 case STATE_REQ_SENT: return "req-sent"; 5031 case STATE_ACK_RCVD: return "ack-rcvd"; 5032 case STATE_ACK_SENT: return "ack-sent"; 5033 case STATE_OPENED: return "opened"; 5034 } 5035 return "illegal"; 5036 } 5037 5038 static const char * 5039 sppp_phase_name(enum ppp_phase phase) 5040 { 5041 switch (phase) { 5042 case PHASE_DEAD: return "dead"; 5043 case PHASE_ESTABLISH: return "establish"; 5044 case PHASE_TERMINATE: return "terminate"; 5045 case PHASE_AUTHENTICATE: return "authenticate"; 5046 case PHASE_NETWORK: return "network"; 5047 } 5048 return "illegal"; 5049 } 5050 5051 static const char * 5052 sppp_proto_name(u_short proto) 5053 { 5054 static char buf[12]; 5055 switch (proto) { 5056 case PPP_LCP: return "lcp"; 5057 case PPP_IPCP: return "ipcp"; 5058 case PPP_PAP: return "pap"; 5059 case PPP_CHAP: return "chap"; 5060 case PPP_IPV6CP: return "ipv6cp"; 5061 } 5062 sprintf(buf, "0x%x", (unsigned)proto); 5063 return buf; 5064 } 5065 5066 static void 5067 sppp_print_bytes(const u_char *p, u_short len) 5068 { 5069 addlog(" %02x", *p++); 5070 while (--len > 0) 5071 addlog("-%02x", *p++); 5072 } 5073 5074 static void 5075 sppp_print_string(const char *p, u_short len) 5076 { 5077 u_char c; 5078 5079 while (len-- > 0) { 5080 c = *p++; 5081 /* 5082 * Print only ASCII chars directly. RFC 1994 recommends 5083 * using only them, but we don't rely on it. */ 5084 if (c < ' ' || c > '~') 5085 addlog("\\x%x", c); 5086 else 5087 addlog("%c", c); 5088 } 5089 } 5090 5091 static const char * 5092 sppp_dotted_quad(u_int32_t addr) 5093 { 5094 static char s[16]; 5095 sprintf(s, "%d.%d.%d.%d", 5096 (int)((addr >> 24) & 0xff), 5097 (int)((addr >> 16) & 0xff), 5098 (int)((addr >> 8) & 0xff), 5099 (int)(addr & 0xff)); 5100 return s; 5101 } 5102 5103 static int 5104 sppp_strnlen(u_char *p, int max) 5105 { 5106 int len; 5107 5108 for (len = 0; len < max && *p; ++p) 5109 ++len; 5110 return len; 5111 } 5112 5113 /* a dummy, used to drop uninteresting events */ 5114 static void 5115 sppp_null(struct sppp *unused) 5116 { 5117 /* do just nothing */ 5118 } 5119 /* 5120 * This file is large. Tell emacs to highlight it nevertheless. 5121 * 5122 * Local Variables: 5123 * hilit-auto-highlight-maxout: 120000 5124 * End: 5125 */ 5126
Indexes created Fri Sep 26 20:09:58 GMT 2025