if_spppsubr.c revision 1.20.2.6
1 /* $NetBSD: if_spppsubr.c,v 1.20.2.6 2002/01/08 00:33:53 nathanw 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 1.20.2.6 2002/01/08 00:33:53 nathanw 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 } 1199 break; 1200 case CISCO_ADDR_REQ: 1201 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1202 if (me != 0L) 1203 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1204 break; 1205 } 1206 } 1207 1208 /* 1209 * Send Cisco keepalive packet. 1210 */ 1211 static void 1212 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1213 { 1214 STDDCL; 1215 struct ppp_header *h; 1216 struct cisco_packet *ch; 1217 struct mbuf *m; 1218 u_int32_t t = (time.tv_sec - boottime.tv_sec) * 1000; 1219 1220 MGETHDR (m, M_DONTWAIT, MT_DATA); 1221 if (! m) 1222 return; 1223 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1224 m->m_pkthdr.rcvif = 0; 1225 1226 h = mtod (m, struct ppp_header*); 1227 h->address = CISCO_MULTICAST; 1228 h->control = 0; 1229 h->protocol = htons (CISCO_KEEPALIVE); 1230 1231 ch = (struct cisco_packet*) (h + 1); 1232 ch->type = htonl (type); 1233 ch->par1 = htonl (par1); 1234 ch->par2 = htonl (par2); 1235 ch->rel = -1; 1236 1237 ch->time0 = htons ((u_short) (t >> 16)); 1238 ch->time1 = htons ((u_short) t); 1239 1240 if (debug) 1241 log(LOG_DEBUG, 1242 SPP_FMT "cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1243 SPP_ARGS(ifp), ntohl (ch->type), ch->par1, 1244 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1245 (u_int)ch->time1); 1246 1247 if (IF_QFULL (&sp->pp_cpq)) { 1248 IF_DROP (&sp->pp_fastq); 1249 IF_DROP (&ifp->if_snd); 1250 m_freem (m); 1251 } else 1252 IF_ENQUEUE (&sp->pp_cpq, m); 1253 if (! (ifp->if_flags & IFF_OACTIVE)) 1254 (*ifp->if_start) (ifp); 1255 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1256 } 1257 1258 /* 1260 * PPP protocol implementation. 1261 */ 1262 1263 /* 1264 * Send PPP control protocol packet. 1265 */ 1266 static void 1267 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1268 u_char ident, u_short len, void *data) 1269 { 1270 STDDCL; 1271 struct lcp_header *lh; 1272 struct mbuf *m; 1273 size_t pkthdrlen; 1274 1275 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1276 1277 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1278 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1279 MGETHDR (m, M_DONTWAIT, MT_DATA); 1280 if (! m) 1281 return; 1282 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1283 m->m_pkthdr.rcvif = 0; 1284 1285 if (sp->pp_flags & PP_NOFRAMING) { 1286 *mtod(m, u_int16_t*) = htons(proto); 1287 lh = (struct lcp_header*)(mtod(m, u_int8_t*) + 2); 1288 } else { 1289 struct ppp_header *h; 1290 h = mtod (m, struct ppp_header*); 1291 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1292 h->control = PPP_UI; /* Unnumbered Info */ 1293 h->protocol = htons (proto); /* Link Control Protocol */ 1294 lh = (struct lcp_header*) (h + 1); 1295 } 1296 lh->type = type; 1297 lh->ident = ident; 1298 lh->len = htons (LCP_HEADER_LEN + len); 1299 if (len) 1300 bcopy (data, lh+1, len); 1301 1302 if (debug) { 1303 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 1304 SPP_ARGS(ifp), 1305 sppp_proto_name(proto), 1306 sppp_cp_type_name (lh->type), lh->ident, 1307 ntohs (lh->len)); 1308 if (len) 1309 sppp_print_bytes ((u_char*) (lh+1), len); 1310 addlog(">\n"); 1311 } 1312 if (IF_QFULL (&sp->pp_cpq)) { 1313 IF_DROP (&sp->pp_fastq); 1314 IF_DROP (&ifp->if_snd); 1315 m_freem (m); 1316 ++ifp->if_oerrors; 1317 } else 1318 IF_ENQUEUE (&sp->pp_cpq, m); 1319 if (! (ifp->if_flags & IFF_OACTIVE)) 1320 (*ifp->if_start) (ifp); 1321 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1322 } 1323 1324 /* 1325 * Handle incoming PPP control protocol packets. 1326 */ 1327 static void 1328 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1329 { 1330 STDDCL; 1331 struct lcp_header *h; 1332 int len = m->m_pkthdr.len; 1333 int rv; 1334 u_char *p; 1335 u_int32_t u32; 1336 1337 if (len < 4) { 1338 if (debug) 1339 log(LOG_DEBUG, 1340 SPP_FMT "%s invalid packet length: %d bytes\n", 1341 SPP_ARGS(ifp), cp->name, len); 1342 return; 1343 } 1344 h = mtod (m, struct lcp_header*); 1345 if (debug) { 1346 log(LOG_DEBUG, 1347 SPP_FMT "%s input(%s): <%s id=0x%x len=%d", 1348 SPP_ARGS(ifp), cp->name, 1349 sppp_state_name(sp->state[cp->protoidx]), 1350 sppp_cp_type_name (h->type), h->ident, ntohs (h->len)); 1351 if (len > 4) 1352 sppp_print_bytes ((u_char*) (h+1), len-4); 1353 addlog(">\n"); 1354 } 1355 if (len > ntohs (h->len)) 1356 len = ntohs (h->len); 1357 p = (u_char *)(h + 1); 1358 switch (h->type) { 1359 case CONF_REQ: 1360 if (len < 4) { 1361 if (debug) 1362 addlog(SPP_FMT "%s invalid conf-req length %d\n", 1363 SPP_ARGS(ifp), cp->name, 1364 len); 1365 ++ifp->if_ierrors; 1366 break; 1367 } 1368 /* handle states where RCR doesn't get a SCA/SCN */ 1369 switch (sp->state[cp->protoidx]) { 1370 case STATE_CLOSING: 1371 case STATE_STOPPING: 1372 return; 1373 case STATE_CLOSED: 1374 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1375 0, 0); 1376 return; 1377 } 1378 rv = (cp->RCR)(sp, h, len); 1379 switch (sp->state[cp->protoidx]) { 1380 case STATE_OPENED: 1381 (cp->tld)(sp); 1382 (cp->scr)(sp); 1383 /* fall through... */ 1384 case STATE_ACK_SENT: 1385 case STATE_REQ_SENT: 1386 sppp_cp_change_state(cp, sp, rv? 1387 STATE_ACK_SENT: STATE_REQ_SENT); 1388 break; 1389 case STATE_STOPPED: 1390 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1391 (cp->scr)(sp); 1392 sppp_cp_change_state(cp, sp, rv? 1393 STATE_ACK_SENT: STATE_REQ_SENT); 1394 break; 1395 case STATE_ACK_RCVD: 1396 if (rv) { 1397 sppp_cp_change_state(cp, sp, STATE_OPENED); 1398 if (debug) 1399 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1400 SPP_ARGS(ifp), 1401 cp->name); 1402 (cp->tlu)(sp); 1403 } else 1404 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1405 break; 1406 default: 1407 printf(SPP_FMT "%s illegal %s in state %s\n", 1408 SPP_ARGS(ifp), cp->name, 1409 sppp_cp_type_name(h->type), 1410 sppp_state_name(sp->state[cp->protoidx])); 1411 ++ifp->if_ierrors; 1412 } 1413 break; 1414 case CONF_ACK: 1415 if (h->ident != sp->confid[cp->protoidx]) { 1416 if (debug) 1417 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1418 SPP_ARGS(ifp), cp->name, 1419 h->ident, sp->confid[cp->protoidx]); 1420 ++ifp->if_ierrors; 1421 break; 1422 } 1423 switch (sp->state[cp->protoidx]) { 1424 case STATE_CLOSED: 1425 case STATE_STOPPED: 1426 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1427 break; 1428 case STATE_CLOSING: 1429 case STATE_STOPPING: 1430 break; 1431 case STATE_REQ_SENT: 1432 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1433 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1434 break; 1435 case STATE_OPENED: 1436 (cp->tld)(sp); 1437 /* fall through */ 1438 case STATE_ACK_RCVD: 1439 (cp->scr)(sp); 1440 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1441 break; 1442 case STATE_ACK_SENT: 1443 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1444 sppp_cp_change_state(cp, sp, STATE_OPENED); 1445 if (debug) 1446 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1447 SPP_ARGS(ifp), cp->name); 1448 (cp->tlu)(sp); 1449 break; 1450 default: 1451 printf(SPP_FMT "%s illegal %s in state %s\n", 1452 SPP_ARGS(ifp), cp->name, 1453 sppp_cp_type_name(h->type), 1454 sppp_state_name(sp->state[cp->protoidx])); 1455 ++ifp->if_ierrors; 1456 } 1457 break; 1458 case CONF_NAK: 1459 case CONF_REJ: 1460 if (h->ident != sp->confid[cp->protoidx]) { 1461 if (debug) 1462 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1463 SPP_ARGS(ifp), cp->name, 1464 h->ident, sp->confid[cp->protoidx]); 1465 ++ifp->if_ierrors; 1466 break; 1467 } 1468 if (h->type == CONF_NAK) 1469 (cp->RCN_nak)(sp, h, len); 1470 else /* CONF_REJ */ 1471 (cp->RCN_rej)(sp, h, len); 1472 1473 switch (sp->state[cp->protoidx]) { 1474 case STATE_CLOSED: 1475 case STATE_STOPPED: 1476 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1477 break; 1478 case STATE_REQ_SENT: 1479 case STATE_ACK_SENT: 1480 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1481 (cp->scr)(sp); 1482 break; 1483 case STATE_OPENED: 1484 (cp->tld)(sp); 1485 /* fall through */ 1486 case STATE_ACK_RCVD: 1487 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1488 (cp->scr)(sp); 1489 break; 1490 case STATE_CLOSING: 1491 case STATE_STOPPING: 1492 break; 1493 default: 1494 printf(SPP_FMT "%s illegal %s in state %s\n", 1495 SPP_ARGS(ifp), cp->name, 1496 sppp_cp_type_name(h->type), 1497 sppp_state_name(sp->state[cp->protoidx])); 1498 ++ifp->if_ierrors; 1499 } 1500 break; 1501 1502 case TERM_REQ: 1503 switch (sp->state[cp->protoidx]) { 1504 case STATE_ACK_RCVD: 1505 case STATE_ACK_SENT: 1506 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1507 /* fall through */ 1508 case STATE_CLOSED: 1509 case STATE_STOPPED: 1510 case STATE_CLOSING: 1511 case STATE_STOPPING: 1512 case STATE_REQ_SENT: 1513 sta: 1514 /* Send Terminate-Ack packet. */ 1515 if (debug) 1516 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n", 1517 SPP_ARGS(ifp), cp->name); 1518 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1519 break; 1520 case STATE_OPENED: 1521 (cp->tld)(sp); 1522 sp->rst_counter[cp->protoidx] = 0; 1523 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1524 goto sta; 1525 break; 1526 default: 1527 printf(SPP_FMT "%s illegal %s in state %s\n", 1528 SPP_ARGS(ifp), cp->name, 1529 sppp_cp_type_name(h->type), 1530 sppp_state_name(sp->state[cp->protoidx])); 1531 ++ifp->if_ierrors; 1532 } 1533 break; 1534 case TERM_ACK: 1535 switch (sp->state[cp->protoidx]) { 1536 case STATE_CLOSED: 1537 case STATE_STOPPED: 1538 case STATE_REQ_SENT: 1539 case STATE_ACK_SENT: 1540 break; 1541 case STATE_CLOSING: 1542 (cp->tlf)(sp); 1543 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1544 sppp_lcp_check_and_close(sp); 1545 break; 1546 case STATE_STOPPING: 1547 (cp->tlf)(sp); 1548 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1549 sppp_lcp_check_and_close(sp); 1550 break; 1551 case STATE_ACK_RCVD: 1552 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1553 break; 1554 case STATE_OPENED: 1555 (cp->tld)(sp); 1556 (cp->scr)(sp); 1557 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1558 break; 1559 default: 1560 printf(SPP_FMT "%s illegal %s in state %s\n", 1561 SPP_ARGS(ifp), cp->name, 1562 sppp_cp_type_name(h->type), 1563 sppp_state_name(sp->state[cp->protoidx])); 1564 ++ifp->if_ierrors; 1565 } 1566 break; 1567 case CODE_REJ: 1568 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1569 log(LOG_INFO, 1570 SPP_FMT "%s: ignoring RXJ (%s) for code ?, " 1571 "danger will robinson\n", 1572 SPP_ARGS(ifp), cp->name, 1573 sppp_cp_type_name(h->type)); 1574 switch (sp->state[cp->protoidx]) { 1575 case STATE_CLOSED: 1576 case STATE_STOPPED: 1577 case STATE_REQ_SENT: 1578 case STATE_ACK_SENT: 1579 case STATE_CLOSING: 1580 case STATE_STOPPING: 1581 case STATE_OPENED: 1582 break; 1583 case STATE_ACK_RCVD: 1584 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1585 break; 1586 default: 1587 printf(SPP_FMT "%s illegal %s in state %s\n", 1588 SPP_ARGS(ifp), cp->name, 1589 sppp_cp_type_name(h->type), 1590 sppp_state_name(sp->state[cp->protoidx])); 1591 ++ifp->if_ierrors; 1592 } 1593 break; 1594 case PROTO_REJ: 1595 { 1596 int catastrophic; 1597 const struct cp *upper; 1598 int i; 1599 u_int16_t proto; 1600 1601 catastrophic = 0; 1602 upper = NULL; 1603 proto = p[0] << 8 | p[1]; 1604 for (i = 0; i < IDX_COUNT; i++) { 1605 if (cps[i]->proto == proto) { 1606 upper = cps[i]; 1607 break; 1608 } 1609 } 1610 if (upper == NULL) 1611 catastrophic++; 1612 1613 log(LOG_INFO, 1614 SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1615 SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+', 1616 sppp_cp_type_name(h->type), proto, 1617 upper ? upper->name : "unknown", 1618 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1619 1620 /* 1621 * if we got RXJ+ against conf-req, the peer does not implement 1622 * this particular protocol type. terminate the protocol. 1623 */ 1624 if (upper && !catastrophic) { 1625 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1626 upper->Close(sp); 1627 break; 1628 } 1629 } 1630 1631 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1632 switch (sp->state[cp->protoidx]) { 1633 case STATE_CLOSED: 1634 case STATE_STOPPED: 1635 case STATE_REQ_SENT: 1636 case STATE_ACK_SENT: 1637 case STATE_CLOSING: 1638 case STATE_STOPPING: 1639 case STATE_OPENED: 1640 break; 1641 case STATE_ACK_RCVD: 1642 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1643 break; 1644 default: 1645 printf(SPP_FMT "%s illegal %s in state %s\n", 1646 SPP_ARGS(ifp), cp->name, 1647 sppp_cp_type_name(h->type), 1648 sppp_state_name(sp->state[cp->protoidx])); 1649 ++ifp->if_ierrors; 1650 } 1651 break; 1652 } 1653 case DISC_REQ: 1654 if (cp->proto != PPP_LCP) 1655 goto illegal; 1656 /* Discard the packet. */ 1657 break; 1658 case ECHO_REQ: 1659 if (cp->proto != PPP_LCP) 1660 goto illegal; 1661 if (sp->state[cp->protoidx] != STATE_OPENED) { 1662 if (debug) 1663 addlog(SPP_FMT "lcp echo req but lcp closed\n", 1664 SPP_ARGS(ifp)); 1665 ++ifp->if_ierrors; 1666 break; 1667 } 1668 if (len < 8) { 1669 if (debug) 1670 addlog(SPP_FMT "invalid lcp echo request " 1671 "packet length: %d bytes\n", 1672 SPP_ARGS(ifp), len); 1673 break; 1674 } 1675 memcpy(&u32, h + 1, sizeof u32); 1676 if (ntohl(u32) == sp->lcp.magic) { 1677 /* Line loopback mode detected. */ 1678 printf(SPP_FMT "loopback\n", SPP_ARGS(ifp)); 1679 if_down (ifp); 1680 IF_PURGE (&sp->pp_cpq); 1681 1682 /* Shut down the PPP link. */ 1683 /* XXX */ 1684 lcp.Down(sp); 1685 lcp.Up(sp); 1686 break; 1687 } 1688 u32 = htonl(sp->lcp.magic); 1689 memcpy(h + 1, &u32, sizeof u32); 1690 if (debug) 1691 addlog(SPP_FMT "got lcp echo req, sending echo rep\n", 1692 SPP_ARGS(ifp)); 1693 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1); 1694 break; 1695 case ECHO_REPLY: 1696 if (cp->proto != PPP_LCP) 1697 goto illegal; 1698 if (h->ident != sp->lcp.echoid) { 1699 ++ifp->if_ierrors; 1700 break; 1701 } 1702 if (len < 8) { 1703 if (debug) 1704 addlog(SPP_FMT "lcp invalid echo reply " 1705 "packet length: %d bytes\n", 1706 SPP_ARGS(ifp), len); 1707 break; 1708 } 1709 if (debug) 1710 addlog(SPP_FMT "lcp got echo rep\n", 1711 SPP_ARGS(ifp)); 1712 memcpy(&u32, h + 1, sizeof u32); 1713 if (ntohl(u32) != sp->lcp.magic) 1714 sp->pp_alivecnt = 0; 1715 break; 1716 default: 1717 /* Unknown packet type -- send Code-Reject packet. */ 1718 illegal: 1719 if (debug) 1720 addlog(SPP_FMT "%s send code-rej for 0x%x\n", 1721 SPP_ARGS(ifp), cp->name, h->type); 1722 sppp_cp_send(sp, cp->proto, CODE_REJ, 1723 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1724 ++ifp->if_ierrors; 1725 } 1726 } 1727 1728 1729 /* 1730 * The generic part of all Up/Down/Open/Close/TO event handlers. 1731 * Basically, the state transition handling in the automaton. 1732 */ 1733 static void 1734 sppp_up_event(const struct cp *cp, struct sppp *sp) 1735 { 1736 STDDCL; 1737 1738 if (debug) 1739 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n", 1740 SPP_ARGS(ifp), cp->name, 1741 sppp_state_name(sp->state[cp->protoidx])); 1742 1743 switch (sp->state[cp->protoidx]) { 1744 case STATE_INITIAL: 1745 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1746 break; 1747 case STATE_STARTING: 1748 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1749 (cp->scr)(sp); 1750 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1751 break; 1752 default: 1753 printf(SPP_FMT "%s illegal up in state %s\n", 1754 SPP_ARGS(ifp), cp->name, 1755 sppp_state_name(sp->state[cp->protoidx])); 1756 } 1757 } 1758 1759 static void 1760 sppp_down_event(const struct cp *cp, struct sppp *sp) 1761 { 1762 STDDCL; 1763 1764 if (debug) 1765 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n", 1766 SPP_ARGS(ifp), cp->name, 1767 sppp_state_name(sp->state[cp->protoidx])); 1768 1769 switch (sp->state[cp->protoidx]) { 1770 case STATE_CLOSED: 1771 case STATE_CLOSING: 1772 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1773 break; 1774 case STATE_STOPPED: 1775 (cp->tls)(sp); 1776 /* fall through */ 1777 case STATE_STOPPING: 1778 case STATE_REQ_SENT: 1779 case STATE_ACK_RCVD: 1780 case STATE_ACK_SENT: 1781 sppp_cp_change_state(cp, sp, STATE_STARTING); 1782 break; 1783 case STATE_OPENED: 1784 (cp->tld)(sp); 1785 sppp_cp_change_state(cp, sp, STATE_STARTING); 1786 break; 1787 default: 1788 printf(SPP_FMT "%s illegal down in state %s\n", 1789 SPP_ARGS(ifp), cp->name, 1790 sppp_state_name(sp->state[cp->protoidx])); 1791 } 1792 } 1793 1794 1795 static void 1796 sppp_open_event(const struct cp *cp, struct sppp *sp) 1797 { 1798 STDDCL; 1799 1800 if (debug) 1801 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n", 1802 SPP_ARGS(ifp), cp->name, 1803 sppp_state_name(sp->state[cp->protoidx])); 1804 1805 switch (sp->state[cp->protoidx]) { 1806 case STATE_INITIAL: 1807 (cp->tls)(sp); 1808 sppp_cp_change_state(cp, sp, STATE_STARTING); 1809 break; 1810 case STATE_STARTING: 1811 break; 1812 case STATE_CLOSED: 1813 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1814 (cp->scr)(sp); 1815 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1816 break; 1817 case STATE_STOPPED: 1818 case STATE_STOPPING: 1819 case STATE_REQ_SENT: 1820 case STATE_ACK_RCVD: 1821 case STATE_ACK_SENT: 1822 case STATE_OPENED: 1823 break; 1824 case STATE_CLOSING: 1825 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1826 break; 1827 } 1828 } 1829 1830 1831 static void 1832 sppp_close_event(const struct cp *cp, struct sppp *sp) 1833 { 1834 STDDCL; 1835 1836 if (debug) 1837 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n", 1838 SPP_ARGS(ifp), cp->name, 1839 sppp_state_name(sp->state[cp->protoidx])); 1840 1841 switch (sp->state[cp->protoidx]) { 1842 case STATE_INITIAL: 1843 case STATE_CLOSED: 1844 case STATE_CLOSING: 1845 break; 1846 case STATE_STARTING: 1847 (cp->tlf)(sp); 1848 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1849 break; 1850 case STATE_STOPPED: 1851 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1852 break; 1853 case STATE_STOPPING: 1854 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1855 break; 1856 case STATE_OPENED: 1857 (cp->tld)(sp); 1858 /* fall through */ 1859 case STATE_REQ_SENT: 1860 case STATE_ACK_RCVD: 1861 case STATE_ACK_SENT: 1862 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1863 sppp_cp_send(sp, cp->proto, TERM_REQ, 1864 ++sp->pp_seq[cp->protoidx], 0, 0); 1865 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1866 break; 1867 } 1868 } 1869 1870 static void 1871 sppp_to_event(const struct cp *cp, struct sppp *sp) 1872 { 1873 STDDCL; 1874 int s; 1875 1876 s = splnet(); 1877 if (debug) 1878 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n", 1879 SPP_ARGS(ifp), cp->name, 1880 sppp_state_name(sp->state[cp->protoidx]), 1881 sp->rst_counter[cp->protoidx]); 1882 1883 if (--sp->rst_counter[cp->protoidx] < 0) 1884 /* TO- event */ 1885 switch (sp->state[cp->protoidx]) { 1886 case STATE_CLOSING: 1887 (cp->tlf)(sp); 1888 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1889 sppp_lcp_check_and_close(sp); 1890 break; 1891 case STATE_STOPPING: 1892 (cp->tlf)(sp); 1893 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1894 sppp_lcp_check_and_close(sp); 1895 break; 1896 case STATE_REQ_SENT: 1897 case STATE_ACK_RCVD: 1898 case STATE_ACK_SENT: 1899 (cp->tlf)(sp); 1900 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1901 sppp_lcp_check_and_close(sp); 1902 break; 1903 } 1904 else 1905 /* TO+ event */ 1906 switch (sp->state[cp->protoidx]) { 1907 case STATE_CLOSING: 1908 case STATE_STOPPING: 1909 sppp_cp_send(sp, cp->proto, TERM_REQ, 1910 ++sp->pp_seq[cp->protoidx], 0, 0); 1911 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1912 cp->TO, sp); 1913 break; 1914 case STATE_REQ_SENT: 1915 case STATE_ACK_RCVD: 1916 (cp->scr)(sp); 1917 /* sppp_cp_change_state() will restart the timer */ 1918 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1919 break; 1920 case STATE_ACK_SENT: 1921 (cp->scr)(sp); 1922 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1923 cp->TO, sp); 1924 break; 1925 } 1926 1927 splx(s); 1928 } 1929 1930 /* 1931 * Change the state of a control protocol in the state automaton. 1932 * Takes care of starting/stopping the restart timer. 1933 */ 1934 void 1935 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1936 { 1937 sp->state[cp->protoidx] = newstate; 1938 callout_stop(&sp->ch[cp->protoidx]); 1939 switch (newstate) { 1940 case STATE_INITIAL: 1941 case STATE_STARTING: 1942 case STATE_CLOSED: 1943 case STATE_STOPPED: 1944 case STATE_OPENED: 1945 break; 1946 case STATE_CLOSING: 1947 case STATE_STOPPING: 1948 case STATE_REQ_SENT: 1949 case STATE_ACK_RCVD: 1950 case STATE_ACK_SENT: 1951 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1952 cp->TO, sp); 1953 break; 1954 } 1955 } 1956 /* 1958 *--------------------------------------------------------------------------* 1959 * * 1960 * The LCP implementation. * 1961 * * 1962 *--------------------------------------------------------------------------* 1963 */ 1964 static void 1965 sppp_lcp_init(struct sppp *sp) 1966 { 1967 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1968 sp->lcp.magic = 0; 1969 sp->state[IDX_LCP] = STATE_INITIAL; 1970 sp->fail_counter[IDX_LCP] = 0; 1971 sp->pp_seq[IDX_LCP] = 0; 1972 sp->pp_rseq[IDX_LCP] = 0; 1973 sp->lcp.protos = 0; 1974 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 1975 1976 /* 1977 * Initialize counters and timeout values. Note that we don't 1978 * use the 3 seconds suggested in RFC 1661 since we are likely 1979 * running on a fast link. XXX We should probably implement 1980 * the exponential backoff option. Note that these values are 1981 * relevant for all control protocols, not just LCP only. 1982 */ 1983 sp->lcp.timeout = 1 * hz; 1984 sp->lcp.max_terminate = 2; 1985 sp->lcp.max_configure = 10; 1986 sp->lcp.max_failure = 10; 1987 callout_init(&sp->ch[IDX_LCP]); 1988 } 1989 1990 static void 1991 sppp_lcp_up(struct sppp *sp) 1992 { 1993 STDDCL; 1994 1995 /* 1996 * If this interface is passive or dial-on-demand, and we are 1997 * still in Initial state, it means we've got an incoming 1998 * call. Activate the interface. 1999 */ 2000 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2001 if (debug) 2002 log(LOG_DEBUG, 2003 SPP_FMT "Up event", SPP_ARGS(ifp)); 2004 ifp->if_flags |= IFF_RUNNING; 2005 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2006 if (debug) 2007 addlog("(incoming call)\n"); 2008 sp->pp_flags |= PP_CALLIN; 2009 lcp.Open(sp); 2010 } else if (debug) 2011 addlog("\n"); 2012 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2013 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2014 ifp->if_flags |= IFF_RUNNING; 2015 lcp.Open(sp); 2016 } 2017 2018 sppp_up_event(&lcp, sp); 2019 } 2020 2021 static void 2022 sppp_lcp_down(struct sppp *sp) 2023 { 2024 STDDCL; 2025 2026 sppp_down_event(&lcp, sp); 2027 2028 /* 2029 * If this is neither a dial-on-demand nor a passive 2030 * interface, simulate an ``ifconfig down'' action, so the 2031 * administrator can force a redial by another ``ifconfig 2032 * up''. XXX For leased line operation, should we immediately 2033 * try to reopen the connection here? 2034 */ 2035 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2036 log(LOG_INFO, 2037 SPP_FMT "Down event (carrier loss), taking interface down.\n", 2038 SPP_ARGS(ifp)); 2039 if_down(ifp); 2040 } else { 2041 if (debug) 2042 log(LOG_DEBUG, 2043 SPP_FMT "Down event (carrier loss)\n", 2044 SPP_ARGS(ifp)); 2045 } 2046 sp->pp_flags &= ~PP_CALLIN; 2047 if (sp->state[IDX_LCP] != STATE_INITIAL) 2048 lcp.Close(sp); 2049 ifp->if_flags &= ~IFF_RUNNING; 2050 } 2051 2052 static void 2053 sppp_lcp_open(struct sppp *sp) 2054 { 2055 /* 2056 * If we are authenticator, negotiate LCP_AUTH 2057 */ 2058 if (sp->hisauth.proto != 0) 2059 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2060 else 2061 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2062 sp->pp_flags &= ~PP_NEEDAUTH; 2063 sppp_open_event(&lcp, sp); 2064 } 2065 2066 static void 2067 sppp_lcp_close(struct sppp *sp) 2068 { 2069 sppp_close_event(&lcp, sp); 2070 } 2071 2072 static void 2073 sppp_lcp_TO(void *cookie) 2074 { 2075 sppp_to_event(&lcp, (struct sppp *)cookie); 2076 } 2077 2078 /* 2079 * Analyze a configure request. Return true if it was agreeable, and 2080 * caused action sca, false if it has been rejected or nak'ed, and 2081 * caused action scn. (The return value is used to make the state 2082 * transition decision in the state automaton.) 2083 */ 2084 static int 2085 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2086 { 2087 STDDCL; 2088 u_char *buf, *r, *p; 2089 int origlen, rlen; 2090 u_int32_t nmagic; 2091 u_short authproto; 2092 2093 len -= 4; 2094 origlen = len; 2095 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2096 if (! buf) 2097 return (0); 2098 2099 if (debug) 2100 log(LOG_DEBUG, SPP_FMT "lcp parse opts:", 2101 SPP_ARGS(ifp)); 2102 2103 /* pass 1: check for things that need to be rejected */ 2104 p = (void*) (h+1); 2105 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2106 if (debug) 2107 addlog(" %s", sppp_lcp_opt_name(*p)); 2108 switch (*p) { 2109 case LCP_OPT_MAGIC: 2110 /* Magic number. */ 2111 /* fall through, both are same length */ 2112 case LCP_OPT_ASYNC_MAP: 2113 /* Async control character map. */ 2114 if (len >= 6 || p[1] == 6) 2115 continue; 2116 if (debug) 2117 addlog(" [invalid]"); 2118 break; 2119 case LCP_OPT_MRU: 2120 /* Maximum receive unit. */ 2121 if (len >= 4 && p[1] == 4) 2122 continue; 2123 if (debug) 2124 addlog(" [invalid]"); 2125 break; 2126 case LCP_OPT_AUTH_PROTO: 2127 if (len < 4) { 2128 if (debug) 2129 addlog(" [invalid]"); 2130 break; 2131 } 2132 authproto = (p[2] << 8) + p[3]; 2133 if (authproto == PPP_CHAP && p[1] != 5) { 2134 if (debug) 2135 addlog(" [invalid chap len]"); 2136 break; 2137 } 2138 if (sp->myauth.proto == 0) { 2139 /* we are not configured to do auth */ 2140 if (debug) 2141 addlog(" [not configured]"); 2142 break; 2143 } 2144 /* 2145 * Remote want us to authenticate, remember this, 2146 * so we stay in PHASE_AUTHENTICATE after LCP got 2147 * up. 2148 */ 2149 sp->pp_flags |= PP_NEEDAUTH; 2150 continue; 2151 default: 2152 /* Others not supported. */ 2153 if (debug) 2154 addlog(" [rej]"); 2155 break; 2156 } 2157 /* Add the option to rejected list. */ 2158 bcopy (p, r, p[1]); 2159 r += p[1]; 2160 rlen += p[1]; 2161 } 2162 if (rlen) { 2163 if (debug) 2164 addlog(" send conf-rej\n"); 2165 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2166 goto end; 2167 } else if (debug) 2168 addlog("\n"); 2169 2170 /* 2171 * pass 2: check for option values that are unacceptable and 2172 * thus require to be nak'ed. 2173 */ 2174 if (debug) 2175 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ", 2176 SPP_ARGS(ifp)); 2177 2178 p = (void*) (h+1); 2179 len = origlen; 2180 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2181 if (debug) 2182 addlog(" %s", sppp_lcp_opt_name(*p)); 2183 switch (*p) { 2184 case LCP_OPT_MAGIC: 2185 /* Magic number -- extract. */ 2186 nmagic = (u_int32_t)p[2] << 24 | 2187 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2188 if (nmagic != sp->lcp.magic) { 2189 if (debug) 2190 addlog(" 0x%x", nmagic); 2191 continue; 2192 } 2193 /* 2194 * Local and remote magics equal -- loopback? 2195 */ 2196 if (sp->pp_loopcnt >= MAXALIVECNT*5) { 2197 printf (SPP_FMT "loopback\n", 2198 SPP_ARGS(ifp)); 2199 sp->pp_loopcnt = 0; 2200 if (ifp->if_flags & IFF_UP) { 2201 if_down(ifp); 2202 IF_PURGE(&sp->pp_cpq); 2203 /* XXX ? */ 2204 lcp.Down(sp); 2205 lcp.Up(sp); 2206 } 2207 } else if (debug) 2208 addlog(" [glitch]"); 2209 ++sp->pp_loopcnt; 2210 /* 2211 * We negate our magic here, and NAK it. If 2212 * we see it later in an NAK packet, we 2213 * suggest a new one. 2214 */ 2215 nmagic = ~sp->lcp.magic; 2216 /* Gonna NAK it. */ 2217 p[2] = nmagic >> 24; 2218 p[3] = nmagic >> 16; 2219 p[4] = nmagic >> 8; 2220 p[5] = nmagic; 2221 break; 2222 2223 case LCP_OPT_ASYNC_MAP: 2224 /* Async control character map -- check to be zero. */ 2225 if (! p[2] && ! p[3] && ! p[4] && ! p[5]) { 2226 if (debug) 2227 addlog(" [empty]"); 2228 continue; 2229 } 2230 if (debug) 2231 addlog(" [non-empty]"); 2232 /* suggest a zero one */ 2233 p[2] = p[3] = p[4] = p[5] = 0; 2234 break; 2235 2236 case LCP_OPT_MRU: 2237 /* 2238 * Maximum receive unit. Always agreeable, 2239 * but ignored by now. 2240 */ 2241 sp->lcp.their_mru = p[2] * 256 + p[3]; 2242 if (debug) 2243 addlog(" %ld", sp->lcp.their_mru); 2244 continue; 2245 2246 case LCP_OPT_AUTH_PROTO: 2247 authproto = (p[2] << 8) + p[3]; 2248 if (sp->myauth.proto != authproto) { 2249 /* not agreed, nak */ 2250 if (debug) 2251 addlog(" [mine %s != his %s]", 2252 sppp_proto_name(sp->hisauth.proto), 2253 sppp_proto_name(authproto)); 2254 p[2] = sp->myauth.proto >> 8; 2255 p[3] = sp->myauth.proto; 2256 break; 2257 } 2258 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2259 if (debug) 2260 addlog(" [chap not MD5]"); 2261 p[4] = CHAP_MD5; 2262 break; 2263 } 2264 continue; 2265 } 2266 /* Add the option to nak'ed list. */ 2267 bcopy (p, r, p[1]); 2268 r += p[1]; 2269 rlen += p[1]; 2270 } 2271 if (rlen) { 2272 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2273 if (debug) 2274 addlog(" max_failure (%d) exceeded, " 2275 "send conf-rej\n", 2276 sp->lcp.max_failure); 2277 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2278 } else { 2279 if (debug) 2280 addlog(" send conf-nak\n"); 2281 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2282 } 2283 goto end; 2284 } else { 2285 if (debug) 2286 addlog(" send conf-ack\n"); 2287 sp->fail_counter[IDX_LCP] = 0; 2288 sp->pp_loopcnt = 0; 2289 sppp_cp_send (sp, PPP_LCP, CONF_ACK, 2290 h->ident, origlen, h+1); 2291 } 2292 2293 end: 2294 free (buf, M_TEMP); 2295 return (rlen == 0); 2296 } 2297 2298 /* 2299 * Analyze the LCP Configure-Reject option list, and adjust our 2300 * negotiation. 2301 */ 2302 static void 2303 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2304 { 2305 STDDCL; 2306 u_char *buf, *p; 2307 2308 len -= 4; 2309 buf = malloc (len, M_TEMP, M_NOWAIT); 2310 if (!buf) 2311 return; 2312 2313 if (debug) 2314 log(LOG_DEBUG, SPP_FMT "lcp rej opts:", 2315 SPP_ARGS(ifp)); 2316 2317 p = (void*) (h+1); 2318 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2319 if (debug) 2320 addlog(" %s", sppp_lcp_opt_name(*p)); 2321 switch (*p) { 2322 case LCP_OPT_MAGIC: 2323 /* Magic number -- can't use it, use 0 */ 2324 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2325 sp->lcp.magic = 0; 2326 break; 2327 case LCP_OPT_MRU: 2328 /* 2329 * Should not be rejected anyway, since we only 2330 * negotiate a MRU if explicitly requested by 2331 * peer. 2332 */ 2333 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2334 break; 2335 case LCP_OPT_AUTH_PROTO: 2336 /* 2337 * Peer doesn't want to authenticate himself, 2338 * deny unless this is a dialout call, and 2339 * AUTHFLAG_NOCALLOUT is set. 2340 */ 2341 if ((sp->pp_flags & PP_CALLIN) == 0 && 2342 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) { 2343 if (debug) 2344 addlog(" [don't insist on auth " 2345 "for callout]"); 2346 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2347 break; 2348 } 2349 if (debug) 2350 addlog("[access denied]\n"); 2351 lcp.Close(sp); 2352 break; 2353 } 2354 } 2355 if (debug) 2356 addlog("\n"); 2357 free (buf, M_TEMP); 2358 return; 2359 } 2360 2361 /* 2362 * Analyze the LCP Configure-NAK option list, and adjust our 2363 * negotiation. 2364 */ 2365 static void 2366 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2367 { 2368 STDDCL; 2369 u_char *buf, *p; 2370 u_int32_t magic; 2371 2372 len -= 4; 2373 buf = malloc (len, M_TEMP, M_NOWAIT); 2374 if (!buf) 2375 return; 2376 2377 if (debug) 2378 log(LOG_DEBUG, SPP_FMT "lcp nak opts:", 2379 SPP_ARGS(ifp)); 2380 2381 p = (void*) (h+1); 2382 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2383 if (debug) 2384 addlog(" %s", sppp_lcp_opt_name(*p)); 2385 switch (*p) { 2386 case LCP_OPT_MAGIC: 2387 /* Magic number -- renegotiate */ 2388 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2389 len >= 6 && p[1] == 6) { 2390 magic = (u_int32_t)p[2] << 24 | 2391 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2392 /* 2393 * If the remote magic is our negated one, 2394 * this looks like a loopback problem. 2395 * Suggest a new magic to make sure. 2396 */ 2397 if (magic == ~sp->lcp.magic) { 2398 if (debug) 2399 addlog(" magic glitch"); 2400 sp->lcp.magic = random(); 2401 } else { 2402 sp->lcp.magic = magic; 2403 if (debug) 2404 addlog(" %d", magic); 2405 } 2406 } 2407 break; 2408 case LCP_OPT_MRU: 2409 /* 2410 * Peer wants to advise us to negotiate an MRU. 2411 * Agree on it if it's reasonable, or use 2412 * default otherwise. 2413 */ 2414 if (len >= 4 && p[1] == 4) { 2415 u_int mru = p[2] * 256 + p[3]; 2416 if (debug) 2417 addlog(" %d", mru); 2418 if (mru < PP_MTU || mru > PP_MAX_MRU) 2419 mru = PP_MTU; 2420 sp->lcp.mru = mru; 2421 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2422 } 2423 break; 2424 case LCP_OPT_AUTH_PROTO: 2425 /* 2426 * Peer doesn't like our authentication method, 2427 * deny. 2428 */ 2429 if (debug) 2430 addlog("[access denied]\n"); 2431 lcp.Close(sp); 2432 break; 2433 } 2434 } 2435 if (debug) 2436 addlog("\n"); 2437 free (buf, M_TEMP); 2438 return; 2439 } 2440 2441 static void 2442 sppp_lcp_tlu(struct sppp *sp) 2443 { 2444 STDDCL; 2445 int i; 2446 u_int32_t mask; 2447 2448 /* XXX ? */ 2449 if (! (ifp->if_flags & IFF_UP) && 2450 (ifp->if_flags & IFF_RUNNING)) { 2451 /* Coming out of loopback mode. */ 2452 if_up(ifp); 2453 } 2454 2455 for (i = 0; i < IDX_COUNT; i++) 2456 if ((cps[i])->flags & CP_QUAL) 2457 (cps[i])->Open(sp); 2458 2459 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2460 (sp->pp_flags & PP_NEEDAUTH) != 0) 2461 sp->pp_phase = PHASE_AUTHENTICATE; 2462 else 2463 sp->pp_phase = PHASE_NETWORK; 2464 2465 if(debug) 2466 { 2467 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2468 sppp_phase_name(sp->pp_phase)); 2469 } 2470 2471 /* 2472 * Open all authentication protocols. This is even required 2473 * if we already proceeded to network phase, since it might be 2474 * that remote wants us to authenticate, so we might have to 2475 * send a PAP request. Undesired authentication protocols 2476 * don't do anything when they get an Open event. 2477 */ 2478 for (i = 0; i < IDX_COUNT; i++) 2479 if ((cps[i])->flags & CP_AUTH) 2480 (cps[i])->Open(sp); 2481 2482 if (sp->pp_phase == PHASE_NETWORK) { 2483 /* Notify all NCPs. */ 2484 for (i = 0; i < IDX_COUNT; i++) 2485 if ((cps[i])->flags & CP_NCP) 2486 (cps[i])->Open(sp); 2487 } 2488 2489 /* Send Up events to all started protos. */ 2490 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2491 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2492 (cps[i])->Up(sp); 2493 2494 /* notify low-level driver of state change */ 2495 if (sp->pp_chg) 2496 sp->pp_chg(sp, (int)sp->pp_phase); 2497 2498 if (sp->pp_phase == PHASE_NETWORK) 2499 /* if no NCP is starting, close down */ 2500 sppp_lcp_check_and_close(sp); 2501 } 2502 2503 static void 2504 sppp_lcp_tld(struct sppp *sp) 2505 { 2506 STDDCL; 2507 int i; 2508 u_int32_t mask; 2509 2510 sp->pp_phase = PHASE_TERMINATE; 2511 2512 if(debug) 2513 { 2514 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2515 sppp_phase_name(sp->pp_phase)); 2516 } 2517 2518 /* 2519 * Take upper layers down. We send the Down event first and 2520 * the Close second to prevent the upper layers from sending 2521 * ``a flurry of terminate-request packets'', as the RFC 2522 * describes it. 2523 */ 2524 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2525 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2526 (cps[i])->Down(sp); 2527 (cps[i])->Close(sp); 2528 } 2529 } 2530 2531 static void 2532 sppp_lcp_tls(struct sppp *sp) 2533 { 2534 STDDCL; 2535 2536 sp->pp_phase = PHASE_ESTABLISH; 2537 2538 if(debug) 2539 { 2540 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2541 sppp_phase_name(sp->pp_phase)); 2542 } 2543 2544 /* Notify lower layer if desired. */ 2545 if (sp->pp_tls) 2546 (sp->pp_tls)(sp); 2547 } 2548 2549 static void 2550 sppp_lcp_tlf(struct sppp *sp) 2551 { 2552 STDDCL; 2553 2554 sp->pp_phase = PHASE_DEAD; 2555 2556 if(debug) 2557 { 2558 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2559 sppp_phase_name(sp->pp_phase)); 2560 } 2561 2562 /* Notify lower layer if desired. */ 2563 if (sp->pp_tlf) 2564 (sp->pp_tlf)(sp); 2565 } 2566 2567 static void 2568 sppp_lcp_scr(struct sppp *sp) 2569 { 2570 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2571 int i = 0; 2572 u_short authproto; 2573 2574 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2575 if (! sp->lcp.magic) 2576 sp->lcp.magic = random(); 2577 opt[i++] = LCP_OPT_MAGIC; 2578 opt[i++] = 6; 2579 opt[i++] = sp->lcp.magic >> 24; 2580 opt[i++] = sp->lcp.magic >> 16; 2581 opt[i++] = sp->lcp.magic >> 8; 2582 opt[i++] = sp->lcp.magic; 2583 } 2584 2585 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2586 opt[i++] = LCP_OPT_MRU; 2587 opt[i++] = 4; 2588 opt[i++] = sp->lcp.mru >> 8; 2589 opt[i++] = sp->lcp.mru; 2590 } 2591 2592 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2593 authproto = sp->hisauth.proto; 2594 opt[i++] = LCP_OPT_AUTH_PROTO; 2595 opt[i++] = authproto == PPP_CHAP? 5: 4; 2596 opt[i++] = authproto >> 8; 2597 opt[i++] = authproto; 2598 if (authproto == PPP_CHAP) 2599 opt[i++] = CHAP_MD5; 2600 } 2601 2602 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2603 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2604 } 2605 2606 /* 2607 * Check the open NCPs, return true if at least one NCP is open. 2608 */ 2609 static int 2610 sppp_ncp_check(struct sppp *sp) 2611 { 2612 int i, mask; 2613 2614 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2615 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2616 return 1; 2617 return 0; 2618 } 2619 2620 /* 2621 * Re-check the open NCPs and see if we should terminate the link. 2622 * Called by the NCPs during their tlf action handling. 2623 */ 2624 static void 2625 sppp_lcp_check_and_close(struct sppp *sp) 2626 { 2627 2628 if (sp->pp_phase < PHASE_NETWORK) 2629 /* don't bother, we are already going down */ 2630 return; 2631 2632 if (sppp_ncp_check(sp)) 2633 return; 2634 2635 lcp.Close(sp); 2636 } 2637 2638 2639 /* 2641 *--------------------------------------------------------------------------* 2642 * * 2643 * The IPCP implementation. * 2644 * * 2645 *--------------------------------------------------------------------------* 2646 */ 2647 2648 static void 2649 sppp_ipcp_init(struct sppp *sp) 2650 { 2651 sp->ipcp.opts = 0; 2652 sp->ipcp.flags = 0; 2653 sp->state[IDX_IPCP] = STATE_INITIAL; 2654 sp->fail_counter[IDX_IPCP] = 0; 2655 sp->pp_seq[IDX_IPCP] = 0; 2656 sp->pp_rseq[IDX_IPCP] = 0; 2657 callout_init(&sp->ch[IDX_IPCP]); 2658 } 2659 2660 static void 2661 sppp_ipcp_up(struct sppp *sp) 2662 { 2663 sppp_up_event(&ipcp, sp); 2664 } 2665 2666 static void 2667 sppp_ipcp_down(struct sppp *sp) 2668 { 2669 sppp_down_event(&ipcp, sp); 2670 } 2671 2672 static void 2673 sppp_ipcp_open(struct sppp *sp) 2674 { 2675 STDDCL; 2676 u_int32_t myaddr, hisaddr; 2677 2678 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2679 sp->ipcp.req_myaddr = 0; 2680 sp->ipcp.req_hisaddr = 0; 2681 2682 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2683 /* 2684 * If we don't have his address, this probably means our 2685 * interface doesn't want to talk IP at all. (This could 2686 * be the case if somebody wants to speak only IPX, for 2687 * example.) Don't open IPCP in this case. 2688 */ 2689 if (hisaddr == 0L) { 2690 /* XXX this message should go away */ 2691 if (debug) 2692 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n", 2693 SPP_ARGS(ifp)); 2694 return; 2695 } 2696 2697 if (myaddr == 0) { 2698 /* 2699 * I don't have an assigned address, so i need to 2700 * negotiate my address. 2701 */ 2702 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2703 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2704 } 2705 if (hisaddr == 1) { 2706 /* 2707 * XXX - remove this hack! 2708 * remote has no valid adress, we need to get one assigned. 2709 */ 2710 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2711 } 2712 sppp_open_event(&ipcp, sp); 2713 } 2714 2715 static void 2716 sppp_ipcp_close(struct sppp *sp) 2717 { 2718 sppp_close_event(&ipcp, sp); 2719 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2720 /* 2721 * Some address was dynamic, clear it again. 2722 */ 2723 sppp_clear_ip_addrs(sp); 2724 } 2725 2726 static void 2727 sppp_ipcp_TO(void *cookie) 2728 { 2729 sppp_to_event(&ipcp, (struct sppp *)cookie); 2730 } 2731 2732 /* 2733 * Analyze a configure request. Return true if it was agreeable, and 2734 * caused action sca, false if it has been rejected or nak'ed, and 2735 * caused action scn. (The return value is used to make the state 2736 * transition decision in the state automaton.) 2737 */ 2738 static int 2739 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2740 { 2741 u_char *buf, *r, *p; 2742 struct ifnet *ifp = &sp->pp_if; 2743 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2744 u_int32_t hisaddr, desiredaddr; 2745 2746 len -= 4; 2747 origlen = len; 2748 /* 2749 * Make sure to allocate a buf that can at least hold a 2750 * conf-nak with an `address' option. We might need it below. 2751 */ 2752 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2753 if (! buf) 2754 return (0); 2755 2756 /* pass 1: see if we can recognize them */ 2757 if (debug) 2758 log(LOG_DEBUG, SPP_FMT "ipcp parse opts:", 2759 SPP_ARGS(ifp)); 2760 p = (void*) (h+1); 2761 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2762 if (debug) 2763 addlog(" %s", sppp_ipcp_opt_name(*p)); 2764 switch (*p) { 2765 #ifdef notyet 2766 case IPCP_OPT_COMPRESSION: 2767 if (len >= 6 && p[1] >= 6) { 2768 /* correctly formed compress option */ 2769 continue; 2770 } 2771 if (debug) 2772 addlog(" [invalid]"); 2773 break; 2774 #endif 2775 case IPCP_OPT_ADDRESS: 2776 if (len >= 6 && p[1] == 6) { 2777 /* correctly formed address option */ 2778 continue; 2779 } 2780 if (debug) 2781 addlog(" [invalid]"); 2782 break; 2783 default: 2784 /* Others not supported. */ 2785 if (debug) 2786 addlog(" [rej]"); 2787 break; 2788 } 2789 /* Add the option to rejected list. */ 2790 bcopy (p, r, p[1]); 2791 r += p[1]; 2792 rlen += p[1]; 2793 } 2794 if (rlen) { 2795 if (debug) 2796 addlog(" send conf-rej\n"); 2797 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2798 goto end; 2799 } else if (debug) 2800 addlog("\n"); 2801 2802 /* pass 2: parse option values */ 2803 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2804 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2805 else 2806 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2807 if (debug) 2808 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ", 2809 SPP_ARGS(ifp)); 2810 p = (void*) (h+1); 2811 len = origlen; 2812 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2813 if (debug) 2814 addlog(" %s", sppp_ipcp_opt_name(*p)); 2815 switch (*p) { 2816 #ifdef notyet 2817 case IPCP_OPT_COMPRESSION: 2818 continue; 2819 #endif 2820 case IPCP_OPT_ADDRESS: 2821 desiredaddr = p[2] << 24 | p[3] << 16 | 2822 p[4] << 8 | p[5]; 2823 if (desiredaddr == hisaddr || 2824 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2825 /* 2826 * Peer's address is same as our value, 2827 * this is agreeable. Gonna conf-ack 2828 * it. 2829 */ 2830 if (debug) 2831 addlog(" %s [ack]", 2832 sppp_dotted_quad(hisaddr)); 2833 /* record that we've seen it already */ 2834 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2835 sp->ipcp.req_hisaddr = desiredaddr; 2836 hisaddr = desiredaddr; 2837 continue; 2838 } 2839 /* 2840 * The address wasn't agreeable. This is either 2841 * he sent us 0.0.0.0, asking to assign him an 2842 * address, or he send us another address not 2843 * matching our value. Either case, we gonna 2844 * conf-nak it with our value. 2845 */ 2846 if (debug) { 2847 if (desiredaddr == 0) 2848 addlog(" [addr requested]"); 2849 else 2850 addlog(" %s [not agreed]", 2851 sppp_dotted_quad(desiredaddr)); 2852 } 2853 2854 p[2] = hisaddr >> 24; 2855 p[3] = hisaddr >> 16; 2856 p[4] = hisaddr >> 8; 2857 p[5] = hisaddr; 2858 break; 2859 } 2860 /* Add the option to nak'ed list. */ 2861 bcopy (p, r, p[1]); 2862 r += p[1]; 2863 rlen += p[1]; 2864 } 2865 2866 /* 2867 * If we are about to conf-ack the request, but haven't seen 2868 * his address so far, gonna conf-nak it instead, with the 2869 * `address' option present and our idea of his address being 2870 * filled in there, to request negotiation of both addresses. 2871 * 2872 * XXX This can result in an endless req - nak loop if peer 2873 * doesn't want to send us his address. Q: What should we do 2874 * about it? XXX A: implement the max-failure counter. 2875 */ 2876 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2877 buf[0] = IPCP_OPT_ADDRESS; 2878 buf[1] = 6; 2879 buf[2] = hisaddr >> 24; 2880 buf[3] = hisaddr >> 16; 2881 buf[4] = hisaddr >> 8; 2882 buf[5] = hisaddr; 2883 rlen = 6; 2884 if (debug) 2885 addlog(" still need hisaddr"); 2886 } 2887 2888 if (rlen) { 2889 if (debug) 2890 addlog(" send conf-nak\n"); 2891 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2892 } else { 2893 if (debug) 2894 addlog(" send conf-ack\n"); 2895 sppp_cp_send (sp, PPP_IPCP, CONF_ACK, 2896 h->ident, origlen, h+1); 2897 } 2898 2899 end: 2900 free (buf, M_TEMP); 2901 return (rlen == 0); 2902 } 2903 2904 /* 2905 * Analyze the IPCP Configure-Reject option list, and adjust our 2906 * negotiation. 2907 */ 2908 static void 2909 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2910 { 2911 u_char *buf, *p; 2912 struct ifnet *ifp = &sp->pp_if; 2913 int debug = ifp->if_flags & IFF_DEBUG; 2914 2915 len -= 4; 2916 buf = malloc (len, M_TEMP, M_NOWAIT); 2917 if (!buf) 2918 return; 2919 2920 if (debug) 2921 log(LOG_DEBUG, SPP_FMT "ipcp rej opts:", 2922 SPP_ARGS(ifp)); 2923 2924 p = (void*) (h+1); 2925 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2926 if (debug) 2927 addlog(" %s", sppp_ipcp_opt_name(*p)); 2928 switch (*p) { 2929 case IPCP_OPT_ADDRESS: 2930 /* 2931 * Peer doesn't grok address option. This is 2932 * bad. XXX Should we better give up here? 2933 */ 2934 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 2935 break; 2936 #ifdef notyet 2937 case IPCP_OPT_COMPRESS: 2938 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 2939 break; 2940 #endif 2941 } 2942 } 2943 if (debug) 2944 addlog("\n"); 2945 free (buf, M_TEMP); 2946 return; 2947 } 2948 2949 /* 2950 * Analyze the IPCP Configure-NAK option list, and adjust our 2951 * negotiation. 2952 */ 2953 static void 2954 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2955 { 2956 u_char *buf, *p; 2957 struct ifnet *ifp = &sp->pp_if; 2958 int debug = ifp->if_flags & IFF_DEBUG; 2959 u_int32_t wantaddr; 2960 2961 len -= 4; 2962 buf = malloc (len, M_TEMP, M_NOWAIT); 2963 if (!buf) 2964 return; 2965 2966 if (debug) 2967 log(LOG_DEBUG, SPP_FMT "ipcp nak opts:", 2968 SPP_ARGS(ifp)); 2969 2970 p = (void*) (h+1); 2971 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2972 if (debug) 2973 addlog(" %s", sppp_ipcp_opt_name(*p)); 2974 switch (*p) { 2975 case IPCP_OPT_ADDRESS: 2976 /* 2977 * Peer doesn't like our local IP address. See 2978 * if we can do something for him. We'll drop 2979 * him our address then. 2980 */ 2981 if (len >= 6 && p[1] == 6) { 2982 wantaddr = p[2] << 24 | p[3] << 16 | 2983 p[4] << 8 | p[5]; 2984 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2985 if (debug) 2986 addlog(" [wantaddr %s]", 2987 sppp_dotted_quad(wantaddr)); 2988 /* 2989 * When doing dynamic address assignment, 2990 * we accept his offer. Otherwise, we 2991 * ignore it and thus continue to negotiate 2992 * our already existing value. 2993 */ 2994 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 2995 if (debug) 2996 addlog(" [agree]"); 2997 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 2998 sp->ipcp.req_myaddr = wantaddr; 2999 } 3000 } 3001 break; 3002 #ifdef notyet 3003 case IPCP_OPT_COMPRESS: 3004 /* 3005 * Peer wants different compression parameters. 3006 */ 3007 break; 3008 #endif 3009 } 3010 } 3011 if (debug) 3012 addlog("\n"); 3013 free (buf, M_TEMP); 3014 return; 3015 } 3016 3017 static void 3018 sppp_ipcp_tlu(struct sppp *sp) 3019 { 3020 /* we are up. Set addresses and notify anyone interested */ 3021 u_int32_t myaddr, hisaddr; 3022 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3023 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3024 myaddr = sp->ipcp.req_myaddr; 3025 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3026 hisaddr = sp->ipcp.req_hisaddr; 3027 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3028 if (sp->pp_con) 3029 sp->pp_con(sp); 3030 } 3031 3032 static void 3033 sppp_ipcp_tld(struct sppp *sp) 3034 { 3035 } 3036 3037 static void 3038 sppp_ipcp_tls(struct sppp *sp) 3039 { 3040 /* indicate to LCP that it must stay alive */ 3041 sp->lcp.protos |= (1 << IDX_IPCP); 3042 } 3043 3044 static void 3045 sppp_ipcp_tlf(struct sppp *sp) 3046 { 3047 /* we no longer need LCP */ 3048 sp->lcp.protos &= ~(1 << IDX_IPCP); 3049 } 3050 3051 static void 3052 sppp_ipcp_scr(struct sppp *sp) 3053 { 3054 char opt[6 /* compression */ + 6 /* address */]; 3055 u_int32_t ouraddr; 3056 int i = 0; 3057 3058 #ifdef notyet 3059 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3060 opt[i++] = IPCP_OPT_COMPRESSION; 3061 opt[i++] = 6; 3062 opt[i++] = 0; /* VJ header compression */ 3063 opt[i++] = 0x2d; /* VJ header compression */ 3064 opt[i++] = max_slot_id; 3065 opt[i++] = comp_slot_id; 3066 } 3067 #endif 3068 3069 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3070 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3071 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3072 else 3073 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3074 opt[i++] = IPCP_OPT_ADDRESS; 3075 opt[i++] = 6; 3076 opt[i++] = ouraddr >> 24; 3077 opt[i++] = ouraddr >> 16; 3078 opt[i++] = ouraddr >> 8; 3079 opt[i++] = ouraddr; 3080 } 3081 3082 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3083 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3084 } 3085 3086 3087 /* 3089 *--------------------------------------------------------------------------* 3090 * * 3091 * The IPv6CP implementation. * 3092 * * 3093 *--------------------------------------------------------------------------* 3094 */ 3095 3096 #ifdef INET6 3097 static void 3098 sppp_ipv6cp_init(struct sppp *sp) 3099 { 3100 sp->ipv6cp.opts = 0; 3101 sp->ipv6cp.flags = 0; 3102 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3103 sp->fail_counter[IDX_IPV6CP] = 0; 3104 sp->pp_seq[IDX_IPV6CP] = 0; 3105 sp->pp_rseq[IDX_IPV6CP] = 0; 3106 callout_init(&sp->ch[IDX_IPV6CP]); 3107 } 3108 3109 static void 3110 sppp_ipv6cp_up(struct sppp *sp) 3111 { 3112 sppp_up_event(&ipv6cp, sp); 3113 } 3114 3115 static void 3116 sppp_ipv6cp_down(struct sppp *sp) 3117 { 3118 sppp_down_event(&ipv6cp, sp); 3119 } 3120 3121 static void 3122 sppp_ipv6cp_open(struct sppp *sp) 3123 { 3124 STDDCL; 3125 struct in6_addr myaddr, hisaddr; 3126 3127 #ifdef IPV6CP_MYIFID_DYN 3128 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3129 #else 3130 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3131 #endif 3132 3133 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3134 /* 3135 * If we don't have our address, this probably means our 3136 * interface doesn't want to talk IPv6 at all. (This could 3137 * be the case if somebody wants to speak only IPX, for 3138 * example.) Don't open IPv6CP in this case. 3139 */ 3140 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3141 /* XXX this message should go away */ 3142 if (debug) 3143 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n", 3144 SPP_ARGS(ifp)); 3145 return; 3146 } 3147 3148 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3149 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3150 sppp_open_event(&ipv6cp, sp); 3151 } 3152 3153 static void 3154 sppp_ipv6cp_close(struct sppp *sp) 3155 { 3156 sppp_close_event(&ipv6cp, sp); 3157 } 3158 3159 static void 3160 sppp_ipv6cp_TO(void *cookie) 3161 { 3162 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3163 } 3164 3165 /* 3166 * Analyze a configure request. Return true if it was agreeable, and 3167 * caused action sca, false if it has been rejected or nak'ed, and 3168 * caused action scn. (The return value is used to make the state 3169 * transition decision in the state automaton.) 3170 */ 3171 static int 3172 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3173 { 3174 u_char *buf, *r, *p; 3175 struct ifnet *ifp = &sp->pp_if; 3176 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3177 struct in6_addr myaddr, desiredaddr, suggestaddr; 3178 int ifidcount; 3179 int type; 3180 int collision, nohisaddr; 3181 3182 len -= 4; 3183 origlen = len; 3184 /* 3185 * Make sure to allocate a buf that can at least hold a 3186 * conf-nak with an `address' option. We might need it below. 3187 */ 3188 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3189 if (! buf) 3190 return (0); 3191 3192 /* pass 1: see if we can recognize them */ 3193 if (debug) 3194 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:", 3195 SPP_ARGS(ifp)); 3196 p = (void*) (h+1); 3197 ifidcount = 0; 3198 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3199 if (debug) 3200 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3201 switch (*p) { 3202 case IPV6CP_OPT_IFID: 3203 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3204 /* correctly formed address option */ 3205 ifidcount++; 3206 continue; 3207 } 3208 if (debug) 3209 addlog(" [invalid]"); 3210 break; 3211 #ifdef notyet 3212 case IPV6CP_OPT_COMPRESSION: 3213 if (len >= 4 && p[1] >= 4) { 3214 /* correctly formed compress option */ 3215 continue; 3216 } 3217 if (debug) 3218 addlog(" [invalid]"); 3219 break; 3220 #endif 3221 default: 3222 /* Others not supported. */ 3223 if (debug) 3224 addlog(" [rej]"); 3225 break; 3226 } 3227 /* Add the option to rejected list. */ 3228 bcopy (p, r, p[1]); 3229 r += p[1]; 3230 rlen += p[1]; 3231 } 3232 if (rlen) { 3233 if (debug) 3234 addlog(" send conf-rej\n"); 3235 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3236 goto end; 3237 } else if (debug) 3238 addlog("\n"); 3239 3240 /* pass 2: parse option values */ 3241 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3242 if (debug) 3243 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ", 3244 SPP_ARGS(ifp)); 3245 p = (void*) (h+1); 3246 len = origlen; 3247 type = CONF_ACK; 3248 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3249 if (debug) 3250 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3251 switch (*p) { 3252 #ifdef notyet 3253 case IPV6CP_OPT_COMPRESSION: 3254 continue; 3255 #endif 3256 case IPV6CP_OPT_IFID: 3257 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3258 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3259 collision = (bcmp(&desiredaddr.s6_addr[8], 3260 &myaddr.s6_addr[8], 8) == 0); 3261 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3262 3263 desiredaddr.s6_addr16[0] = htons(0xfe80); 3264 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3265 3266 if (!collision && !nohisaddr) { 3267 /* no collision, hisaddr known - Conf-Ack */ 3268 type = CONF_ACK; 3269 3270 if (debug) { 3271 addlog(" %s [%s]", 3272 ip6_sprintf(&desiredaddr), 3273 sppp_cp_type_name(type)); 3274 } 3275 continue; 3276 } 3277 3278 memset(&suggestaddr, 0, sizeof(&suggestaddr)); 3279 if (collision && nohisaddr) { 3280 /* collision, hisaddr unknown - Conf-Rej */ 3281 type = CONF_REJ; 3282 memset(&p[2], 0, 8); 3283 } else { 3284 /* 3285 * - no collision, hisaddr unknown, or 3286 * - collision, hisaddr known 3287 * Conf-Nak, suggest hisaddr 3288 */ 3289 type = CONF_NAK; 3290 sppp_suggest_ip6_addr(sp, &suggestaddr); 3291 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3292 } 3293 if (debug) 3294 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3295 sppp_cp_type_name(type)); 3296 break; 3297 } 3298 /* Add the option to nak'ed list. */ 3299 bcopy (p, r, p[1]); 3300 r += p[1]; 3301 rlen += p[1]; 3302 } 3303 3304 if (rlen == 0 && type == CONF_ACK) { 3305 if (debug) 3306 addlog(" send %s\n", sppp_cp_type_name(type)); 3307 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1); 3308 } else { 3309 #ifdef DIAGNOSTIC 3310 if (type == CONF_ACK) 3311 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3312 #endif 3313 3314 if (debug) { 3315 addlog(" send %s suggest %s\n", 3316 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3317 } 3318 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3319 } 3320 3321 end: 3322 free (buf, M_TEMP); 3323 return (rlen == 0); 3324 } 3325 3326 /* 3327 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3328 * negotiation. 3329 */ 3330 static void 3331 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3332 { 3333 u_char *buf, *p; 3334 struct ifnet *ifp = &sp->pp_if; 3335 int debug = ifp->if_flags & IFF_DEBUG; 3336 3337 len -= 4; 3338 buf = malloc (len, M_TEMP, M_NOWAIT); 3339 if (!buf) 3340 return; 3341 3342 if (debug) 3343 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:", 3344 SPP_ARGS(ifp)); 3345 3346 p = (void*) (h+1); 3347 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3348 if (debug) 3349 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3350 switch (*p) { 3351 case IPV6CP_OPT_IFID: 3352 /* 3353 * Peer doesn't grok address option. This is 3354 * bad. XXX Should we better give up here? 3355 */ 3356 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3357 break; 3358 #ifdef notyet 3359 case IPV6CP_OPT_COMPRESS: 3360 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3361 break; 3362 #endif 3363 } 3364 } 3365 if (debug) 3366 addlog("\n"); 3367 free (buf, M_TEMP); 3368 return; 3369 } 3370 3371 /* 3372 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3373 * negotiation. 3374 */ 3375 static void 3376 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3377 { 3378 u_char *buf, *p; 3379 struct ifnet *ifp = &sp->pp_if; 3380 int debug = ifp->if_flags & IFF_DEBUG; 3381 struct in6_addr suggestaddr; 3382 3383 len -= 4; 3384 buf = malloc (len, M_TEMP, M_NOWAIT); 3385 if (!buf) 3386 return; 3387 3388 if (debug) 3389 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:", 3390 SPP_ARGS(ifp)); 3391 3392 p = (void*) (h+1); 3393 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3394 if (debug) 3395 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3396 switch (*p) { 3397 case IPV6CP_OPT_IFID: 3398 /* 3399 * Peer doesn't like our local ifid. See 3400 * if we can do something for him. We'll drop 3401 * him our address then. 3402 */ 3403 if (len < 10 || p[1] != 10) 3404 break; 3405 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3406 suggestaddr.s6_addr16[0] = htons(0xfe80); 3407 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3408 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3409 3410 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3411 if (debug) 3412 addlog(" [suggestaddr %s]", 3413 ip6_sprintf(&suggestaddr)); 3414 #ifdef IPV6CP_MYIFID_DYN 3415 /* 3416 * When doing dynamic address assignment, 3417 * we accept his offer. 3418 */ 3419 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3420 struct in6_addr lastsuggest; 3421 /* 3422 * If <suggested myaddr from peer> equals to 3423 * <hisaddr we have suggested last time>, 3424 * we have a collision. generate new random 3425 * ifid. 3426 */ 3427 sppp_suggest_ip6_addr(&lastsuggest); 3428 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3429 lastsuggest)) { 3430 if (debug) 3431 addlog(" [random]"); 3432 sppp_gen_ip6_addr(sp, &suggestaddr); 3433 } 3434 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3435 if (debug) 3436 addlog(" [agree]"); 3437 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3438 } 3439 #else 3440 /* 3441 * Since we do not do dynamic address assignment, 3442 * we ignore it and thus continue to negotiate 3443 * our already existing value. This can possibly 3444 * go into infinite request-reject loop. 3445 * 3446 * This is not likely because we normally use 3447 * ifid based on MAC-address. 3448 * If you have no ethernet card on the node, too bad. 3449 * XXX should we use fail_counter? 3450 */ 3451 #endif 3452 break; 3453 #ifdef notyet 3454 case IPV6CP_OPT_COMPRESS: 3455 /* 3456 * Peer wants different compression parameters. 3457 */ 3458 break; 3459 #endif 3460 } 3461 } 3462 if (debug) 3463 addlog("\n"); 3464 free (buf, M_TEMP); 3465 return; 3466 } 3467 3468 static void 3469 sppp_ipv6cp_tlu(struct sppp *sp) 3470 { 3471 /* we are up - notify isdn daemon */ 3472 if (sp->pp_con) 3473 sp->pp_con(sp); 3474 } 3475 3476 static void 3477 sppp_ipv6cp_tld(struct sppp *sp) 3478 { 3479 } 3480 3481 static void 3482 sppp_ipv6cp_tls(struct sppp *sp) 3483 { 3484 /* indicate to LCP that it must stay alive */ 3485 sp->lcp.protos |= (1 << IDX_IPV6CP); 3486 } 3487 3488 static void 3489 sppp_ipv6cp_tlf(struct sppp *sp) 3490 { 3491 /* we no longer need LCP */ 3492 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3493 } 3494 3495 static void 3496 sppp_ipv6cp_scr(struct sppp *sp) 3497 { 3498 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3499 struct in6_addr ouraddr; 3500 int i = 0; 3501 3502 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3503 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3504 opt[i++] = IPV6CP_OPT_IFID; 3505 opt[i++] = 10; 3506 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3507 i += 8; 3508 } 3509 3510 #ifdef notyet 3511 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3512 opt[i++] = IPV6CP_OPT_COMPRESSION; 3513 opt[i++] = 4; 3514 opt[i++] = 0; /* TBD */ 3515 opt[i++] = 0; /* TBD */ 3516 /* variable length data may follow */ 3517 } 3518 #endif 3519 3520 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3521 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3522 } 3523 #else /*INET6*/ 3524 static void sppp_ipv6cp_init(struct sppp *sp) 3525 { 3526 } 3527 3528 static void sppp_ipv6cp_up(struct sppp *sp) 3529 { 3530 } 3531 3532 static void sppp_ipv6cp_down(struct sppp *sp) 3533 { 3534 } 3535 3536 3537 static void sppp_ipv6cp_open(struct sppp *sp) 3538 { 3539 } 3540 3541 static void sppp_ipv6cp_close(struct sppp *sp) 3542 { 3543 } 3544 3545 static void sppp_ipv6cp_TO(void *sp) 3546 { 3547 } 3548 3549 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3550 { 3551 return 0; 3552 } 3553 3554 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3555 { 3556 } 3557 3558 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3559 { 3560 } 3561 3562 static void sppp_ipv6cp_tlu(struct sppp *sp) 3563 { 3564 } 3565 3566 static void sppp_ipv6cp_tld(struct sppp *sp) 3567 { 3568 } 3569 3570 static void sppp_ipv6cp_tls(struct sppp *sp) 3571 { 3572 } 3573 3574 static void sppp_ipv6cp_tlf(struct sppp *sp) 3575 { 3576 } 3577 3578 static void sppp_ipv6cp_scr(struct sppp *sp) 3579 { 3580 } 3581 #endif /*INET6*/ 3582 3583 3584 /* 3586 *--------------------------------------------------------------------------* 3587 * * 3588 * The CHAP implementation. * 3589 * * 3590 *--------------------------------------------------------------------------* 3591 */ 3592 3593 /* 3594 * The authentication protocols don't employ a full-fledged state machine as 3595 * the control protocols do, since they do have Open and Close events, but 3596 * not Up and Down, nor are they explicitly terminated. Also, use of the 3597 * authentication protocols may be different in both directions (this makes 3598 * sense, think of a machine that never accepts incoming calls but only 3599 * calls out, it doesn't require the called party to authenticate itself). 3600 * 3601 * Our state machine for the local authentication protocol (we are requesting 3602 * the peer to authenticate) looks like: 3603 * 3604 * RCA- 3605 * +--------------------------------------------+ 3606 * V scn,tld| 3607 * +--------+ Close +---------+ RCA+ 3608 * | |<----------------------------------| |------+ 3609 * +--->| Closed | TO* | Opened | sca | 3610 * | | |-----+ +-------| |<-----+ 3611 * | +--------+ irc | | +---------+ 3612 * | ^ | | ^ 3613 * | | | | | 3614 * | | | | | 3615 * | TO-| | | | 3616 * | |tld TO+ V | | 3617 * | | +------->+ | | 3618 * | | | | | | 3619 * | +--------+ V | | 3620 * | | |<----+<--------------------+ | 3621 * | | Req- | scr | 3622 * | | Sent | | 3623 * | | | | 3624 * | +--------+ | 3625 * | RCA- | | RCA+ | 3626 * +------+ +------------------------------------------+ 3627 * scn,tld sca,irc,ict,tlu 3628 * 3629 * 3630 * with: 3631 * 3632 * Open: LCP reached authentication phase 3633 * Close: LCP reached terminate phase 3634 * 3635 * RCA+: received reply (pap-req, chap-response), acceptable 3636 * RCN: received reply (pap-req, chap-response), not acceptable 3637 * TO+: timeout with restart counter >= 0 3638 * TO-: timeout with restart counter < 0 3639 * TO*: reschedule timeout for CHAP 3640 * 3641 * scr: send request packet (none for PAP, chap-challenge) 3642 * sca: send ack packet (pap-ack, chap-success) 3643 * scn: send nak packet (pap-nak, chap-failure) 3644 * ict: initialize re-challenge timer (CHAP only) 3645 * 3646 * tlu: this-layer-up, LCP reaches network phase 3647 * tld: this-layer-down, LCP enters terminate phase 3648 * 3649 * Note that in CHAP mode, after sending a new challenge, while the state 3650 * automaton falls back into Req-Sent state, it doesn't signal a tld 3651 * event to LCP, so LCP remains in network phase. Only after not getting 3652 * any response (or after getting an unacceptable response), CHAP closes, 3653 * causing LCP to enter terminate phase. 3654 * 3655 * With PAP, there is no initial request that can be sent. The peer is 3656 * expected to send one based on the successful negotiation of PAP as 3657 * the authentication protocol during the LCP option negotiation. 3658 * 3659 * Incoming authentication protocol requests (remote requests 3660 * authentication, we are peer) don't employ a state machine at all, 3661 * they are simply answered. Some peers [Ascend P50 firmware rev 3662 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3663 * still in authentication phase (thereby violating the standard that 3664 * demands that these NCP packets are to be discarded), so we keep 3665 * track of the peer demanding us to authenticate, and only proceed to 3666 * phase network once we've seen a positive acknowledge for the 3667 * authentication. 3668 */ 3669 3670 /* 3671 * Handle incoming CHAP packets. 3672 */ 3673 void 3674 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3675 { 3676 STDDCL; 3677 struct lcp_header *h; 3678 int len, x; 3679 u_char *value, *name, digest[AUTHKEYLEN], dsize; 3680 int value_len, name_len; 3681 MD5_CTX ctx; 3682 3683 len = m->m_pkthdr.len; 3684 if (len < 4) { 3685 if (debug) 3686 log(LOG_DEBUG, 3687 SPP_FMT "chap invalid packet length: %d bytes\n", 3688 SPP_ARGS(ifp), len); 3689 return; 3690 } 3691 h = mtod (m, struct lcp_header*); 3692 if (len > ntohs (h->len)) 3693 len = ntohs (h->len); 3694 3695 switch (h->type) { 3696 /* challenge, failure and success are his authproto */ 3697 case CHAP_CHALLENGE: 3698 value = 1 + (u_char*)(h+1); 3699 value_len = value[-1]; 3700 name = value + value_len; 3701 name_len = len - value_len - 5; 3702 if (name_len < 0) { 3703 if (debug) { 3704 log(LOG_DEBUG, 3705 SPP_FMT "chap corrupted challenge " 3706 "<%s id=0x%x len=%d", 3707 SPP_ARGS(ifp), 3708 sppp_auth_type_name(PPP_CHAP, h->type), 3709 h->ident, ntohs(h->len)); 3710 if (len > 4) 3711 sppp_print_bytes((u_char*) (h+1), len-4); 3712 addlog(">\n"); 3713 } 3714 break; 3715 } 3716 3717 if (debug) { 3718 log(LOG_DEBUG, 3719 SPP_FMT "chap input <%s id=0x%x len=%d name=", 3720 SPP_ARGS(ifp), 3721 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3722 ntohs(h->len)); 3723 sppp_print_string((char*) name, name_len); 3724 addlog(" value-size=%d value=", value_len); 3725 sppp_print_bytes(value, value_len); 3726 addlog(">\n"); 3727 } 3728 3729 /* Compute reply value. */ 3730 MD5Init(&ctx); 3731 MD5Update(&ctx, &h->ident, 1); 3732 MD5Update(&ctx, sp->myauth.secret, 3733 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN)); 3734 MD5Update(&ctx, value, value_len); 3735 MD5Final(digest, &ctx); 3736 dsize = sizeof digest; 3737 3738 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3739 sizeof dsize, (const char *)&dsize, 3740 sizeof digest, digest, 3741 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 3742 sp->myauth.name, 3743 0); 3744 break; 3745 3746 case CHAP_SUCCESS: 3747 if (debug) { 3748 log(LOG_DEBUG, SPP_FMT "chap success", 3749 SPP_ARGS(ifp)); 3750 if (len > 4) { 3751 addlog(": "); 3752 sppp_print_string((char*)(h + 1), len - 4); 3753 } 3754 addlog("\n"); 3755 } 3756 x = splnet(); 3757 sp->pp_flags &= ~PP_NEEDAUTH; 3758 if (sp->myauth.proto == PPP_CHAP && 3759 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3760 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3761 /* 3762 * We are authenticator for CHAP but didn't 3763 * complete yet. Leave it to tlu to proceed 3764 * to network phase. 3765 */ 3766 splx(x); 3767 break; 3768 } 3769 splx(x); 3770 sppp_phase_network(sp); 3771 break; 3772 3773 case CHAP_FAILURE: 3774 if (debug) { 3775 log(LOG_INFO, SPP_FMT "chap failure", 3776 SPP_ARGS(ifp)); 3777 if (len > 4) { 3778 addlog(": "); 3779 sppp_print_string((char*)(h + 1), len - 4); 3780 } 3781 addlog("\n"); 3782 } else 3783 log(LOG_INFO, SPP_FMT "chap failure\n", 3784 SPP_ARGS(ifp)); 3785 /* await LCP shutdown by authenticator */ 3786 break; 3787 3788 /* response is my authproto */ 3789 case CHAP_RESPONSE: 3790 value = 1 + (u_char*)(h+1); 3791 value_len = value[-1]; 3792 name = value + value_len; 3793 name_len = len - value_len - 5; 3794 if (name_len < 0) { 3795 if (debug) { 3796 log(LOG_DEBUG, 3797 SPP_FMT "chap corrupted response " 3798 "<%s id=0x%x len=%d", 3799 SPP_ARGS(ifp), 3800 sppp_auth_type_name(PPP_CHAP, h->type), 3801 h->ident, ntohs(h->len)); 3802 if (len > 4) 3803 sppp_print_bytes((u_char*)(h+1), len-4); 3804 addlog(">\n"); 3805 } 3806 break; 3807 } 3808 if (h->ident != sp->confid[IDX_CHAP]) { 3809 if (debug) 3810 log(LOG_DEBUG, 3811 SPP_FMT "chap dropping response for old ID " 3812 "(got %d, expected %d)\n", 3813 SPP_ARGS(ifp), 3814 h->ident, sp->confid[IDX_CHAP]); 3815 break; 3816 } 3817 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) 3818 || bcmp(name, sp->hisauth.name, name_len) != 0) { 3819 log(LOG_INFO, SPP_FMT "chap response, his name ", 3820 SPP_ARGS(ifp)); 3821 sppp_print_string(name, name_len); 3822 addlog(" != expected "); 3823 sppp_print_string(sp->hisauth.name, 3824 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)); 3825 addlog("\n"); 3826 } 3827 if (debug) { 3828 log(LOG_DEBUG, SPP_FMT "chap input(%s) " 3829 "<%s id=0x%x len=%d name=", 3830 SPP_ARGS(ifp), 3831 sppp_state_name(sp->state[IDX_CHAP]), 3832 sppp_auth_type_name(PPP_CHAP, h->type), 3833 h->ident, ntohs (h->len)); 3834 sppp_print_string((char*)name, name_len); 3835 addlog(" value-size=%d value=", value_len); 3836 sppp_print_bytes(value, value_len); 3837 addlog(">\n"); 3838 } 3839 if (value_len != AUTHKEYLEN) { 3840 if (debug) 3841 log(LOG_DEBUG, 3842 SPP_FMT "chap bad hash value length: " 3843 "%d bytes, should be %d\n", 3844 SPP_ARGS(ifp), value_len, 3845 AUTHKEYLEN); 3846 break; 3847 } 3848 3849 MD5Init(&ctx); 3850 MD5Update(&ctx, &h->ident, 1); 3851 MD5Update(&ctx, sp->hisauth.secret, 3852 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN)); 3853 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN); 3854 MD5Final(digest, &ctx); 3855 3856 #define FAILMSG "Failed..." 3857 #define SUCCMSG "Welcome!" 3858 3859 if (value_len != sizeof digest || 3860 bcmp(digest, value, value_len) != 0) { 3861 /* action scn, tld */ 3862 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 3863 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 3864 0); 3865 chap.tld(sp); 3866 break; 3867 } 3868 /* action sca, perhaps tlu */ 3869 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 3870 sp->state[IDX_CHAP] == STATE_OPENED) 3871 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 3872 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 3873 0); 3874 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 3875 sppp_cp_change_state(&chap, sp, STATE_OPENED); 3876 chap.tlu(sp); 3877 } 3878 break; 3879 3880 default: 3881 /* Unknown CHAP packet type -- ignore. */ 3882 if (debug) { 3883 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) " 3884 "<0x%x id=0x%xh len=%d", 3885 SPP_ARGS(ifp), 3886 sppp_state_name(sp->state[IDX_CHAP]), 3887 h->type, h->ident, ntohs(h->len)); 3888 if (len > 4) 3889 sppp_print_bytes((u_char*)(h+1), len-4); 3890 addlog(">\n"); 3891 } 3892 break; 3893 3894 } 3895 } 3896 3897 static void 3898 sppp_chap_init(struct sppp *sp) 3899 { 3900 /* Chap doesn't have STATE_INITIAL at all. */ 3901 sp->state[IDX_CHAP] = STATE_CLOSED; 3902 sp->fail_counter[IDX_CHAP] = 0; 3903 sp->pp_seq[IDX_CHAP] = 0; 3904 sp->pp_rseq[IDX_CHAP] = 0; 3905 callout_init(&sp->ch[IDX_CHAP]); 3906 } 3907 3908 static void 3909 sppp_chap_open(struct sppp *sp) 3910 { 3911 if (sp->myauth.proto == PPP_CHAP && 3912 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 3913 /* we are authenticator for CHAP, start it */ 3914 chap.scr(sp); 3915 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3916 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3917 } 3918 /* nothing to be done if we are peer, await a challenge */ 3919 } 3920 3921 static void 3922 sppp_chap_close(struct sppp *sp) 3923 { 3924 if (sp->state[IDX_CHAP] != STATE_CLOSED) 3925 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3926 } 3927 3928 static void 3929 sppp_chap_TO(void *cookie) 3930 { 3931 struct sppp *sp = (struct sppp *)cookie; 3932 STDDCL; 3933 int s; 3934 3935 s = splnet(); 3936 if (debug) 3937 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n", 3938 SPP_ARGS(ifp), 3939 sppp_state_name(sp->state[IDX_CHAP]), 3940 sp->rst_counter[IDX_CHAP]); 3941 3942 if (--sp->rst_counter[IDX_CHAP] < 0) 3943 /* TO- event */ 3944 switch (sp->state[IDX_CHAP]) { 3945 case STATE_REQ_SENT: 3946 chap.tld(sp); 3947 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3948 break; 3949 } 3950 else 3951 /* TO+ (or TO*) event */ 3952 switch (sp->state[IDX_CHAP]) { 3953 case STATE_OPENED: 3954 /* TO* event */ 3955 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3956 /* fall through */ 3957 case STATE_REQ_SENT: 3958 chap.scr(sp); 3959 /* sppp_cp_change_state() will restart the timer */ 3960 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3961 break; 3962 } 3963 3964 splx(s); 3965 } 3966 3967 static void 3968 sppp_chap_tlu(struct sppp *sp) 3969 { 3970 STDDCL; 3971 int i, x; 3972 3973 i = 0; 3974 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3975 3976 /* 3977 * Some broken CHAP implementations (Conware CoNet, firmware 3978 * 4.0.?) don't want to re-authenticate their CHAP once the 3979 * initial challenge-response exchange has taken place. 3980 * Provide for an option to avoid rechallenges. 3981 */ 3982 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) { 3983 /* 3984 * Compute the re-challenge timeout. This will yield 3985 * a number between 300 and 810 seconds. 3986 */ 3987 i = 300 + ((unsigned)(random() & 0xff00) >> 7); 3988 3989 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 3990 } 3991 3992 if (debug) { 3993 log(LOG_DEBUG, 3994 SPP_FMT "chap %s, ", 3995 SPP_ARGS(ifp), 3996 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu"); 3997 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) 3998 addlog("next re-challenge in %d seconds\n", i); 3999 else 4000 addlog("re-challenging supressed\n"); 4001 } 4002 4003 x = splnet(); 4004 /* indicate to LCP that we need to be closed down */ 4005 sp->lcp.protos |= (1 << IDX_CHAP); 4006 4007 if (sp->pp_flags & PP_NEEDAUTH) { 4008 /* 4009 * Remote is authenticator, but his auth proto didn't 4010 * complete yet. Defer the transition to network 4011 * phase. 4012 */ 4013 splx(x); 4014 return; 4015 } 4016 splx(x); 4017 4018 /* 4019 * If we are already in phase network, we are done here. This 4020 * is the case if this is a dummy tlu event after a re-challenge. 4021 */ 4022 if (sp->pp_phase != PHASE_NETWORK) 4023 sppp_phase_network(sp); 4024 } 4025 4026 static void 4027 sppp_chap_tld(struct sppp *sp) 4028 { 4029 STDDCL; 4030 4031 if (debug) 4032 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp)); 4033 callout_stop(&sp->ch[IDX_CHAP]); 4034 sp->lcp.protos &= ~(1 << IDX_CHAP); 4035 4036 lcp.Close(sp); 4037 } 4038 4039 static void 4040 sppp_chap_scr(struct sppp *sp) 4041 { 4042 struct timeval tv; 4043 u_int32_t *ch, seed; 4044 u_char clen; 4045 4046 /* Compute random challenge. */ 4047 ch = (u_int32_t *)sp->myauth.challenge; 4048 microtime(&tv); 4049 seed = tv.tv_sec ^ tv.tv_usec; 4050 ch[0] = seed ^ random(); 4051 ch[1] = seed ^ random(); 4052 ch[2] = seed ^ random(); 4053 ch[3] = seed ^ random(); 4054 clen = AUTHKEYLEN; 4055 4056 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4057 4058 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4059 sizeof clen, (const char *)&clen, 4060 (size_t)AUTHKEYLEN, sp->myauth.challenge, 4061 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 4062 sp->myauth.name, 4063 0); 4064 } 4065 /* 4067 *--------------------------------------------------------------------------* 4068 * * 4069 * The PAP implementation. * 4070 * * 4071 *--------------------------------------------------------------------------* 4072 */ 4073 /* 4074 * For PAP, we need to keep a little state also if we are the peer, not the 4075 * authenticator. This is since we don't get a request to authenticate, but 4076 * have to repeatedly authenticate ourself until we got a response (or the 4077 * retry counter is expired). 4078 */ 4079 4080 /* 4081 * Handle incoming PAP packets. */ 4082 static void 4083 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4084 { 4085 STDDCL; 4086 struct lcp_header *h; 4087 int len, x; 4088 u_char *name, *passwd, mlen; 4089 int name_len, passwd_len; 4090 4091 len = m->m_pkthdr.len; 4092 if (len < 5) { 4093 if (debug) 4094 log(LOG_DEBUG, 4095 SPP_FMT "pap invalid packet length: %d bytes\n", 4096 SPP_ARGS(ifp), len); 4097 return; 4098 } 4099 h = mtod (m, struct lcp_header*); 4100 if (len > ntohs (h->len)) 4101 len = ntohs (h->len); 4102 switch (h->type) { 4103 /* PAP request is my authproto */ 4104 case PAP_REQ: 4105 name = 1 + (u_char*)(h+1); 4106 name_len = name[-1]; 4107 passwd = name + name_len + 1; 4108 if (name_len > len - 6 || 4109 (passwd_len = passwd[-1]) > len - 6 - name_len) { 4110 if (debug) { 4111 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4112 "<%s id=0x%x len=%d", 4113 SPP_ARGS(ifp), 4114 sppp_auth_type_name(PPP_PAP, h->type), 4115 h->ident, ntohs(h->len)); 4116 if (len > 4) 4117 sppp_print_bytes((u_char*)(h+1), len-4); 4118 addlog(">\n"); 4119 } 4120 break; 4121 } 4122 if (debug) { 4123 log(LOG_DEBUG, SPP_FMT "pap input(%s) " 4124 "<%s id=0x%x len=%d name=", 4125 SPP_ARGS(ifp), 4126 sppp_state_name(sp->state[IDX_PAP]), 4127 sppp_auth_type_name(PPP_PAP, h->type), 4128 h->ident, ntohs(h->len)); 4129 sppp_print_string((char*)name, name_len); 4130 addlog(" passwd="); 4131 sppp_print_string((char*)passwd, passwd_len); 4132 addlog(">\n"); 4133 } 4134 if (name_len > AUTHNAMELEN || 4135 passwd_len > AUTHKEYLEN || 4136 bcmp(name, sp->hisauth.name, name_len) != 0 || 4137 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) { 4138 /* action scn, tld */ 4139 mlen = sizeof(FAILMSG) - 1; 4140 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4141 sizeof mlen, (const char *)&mlen, 4142 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4143 0); 4144 pap.tld(sp); 4145 break; 4146 } 4147 /* action sca, perhaps tlu */ 4148 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4149 sp->state[IDX_PAP] == STATE_OPENED) { 4150 mlen = sizeof(SUCCMSG) - 1; 4151 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4152 sizeof mlen, (const char *)&mlen, 4153 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4154 0); 4155 } 4156 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4157 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4158 pap.tlu(sp); 4159 } 4160 break; 4161 4162 /* ack and nak are his authproto */ 4163 case PAP_ACK: 4164 callout_stop(&sp->pap_my_to_ch); 4165 if (debug) { 4166 log(LOG_DEBUG, SPP_FMT "pap success", 4167 SPP_ARGS(ifp)); 4168 name_len = *(char *)h; 4169 if (len > 5 && name_len) { 4170 addlog(": "); 4171 sppp_print_string((char*)(h+1), name_len); 4172 } 4173 addlog("\n"); 4174 } 4175 x = splnet(); 4176 sp->pp_flags &= ~PP_NEEDAUTH; 4177 if (sp->myauth.proto == PPP_PAP && 4178 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4179 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4180 /* 4181 * We are authenticator for PAP but didn't 4182 * complete yet. Leave it to tlu to proceed 4183 * to network phase. 4184 */ 4185 splx(x); 4186 break; 4187 } 4188 splx(x); 4189 sppp_phase_network(sp); 4190 break; 4191 4192 case PAP_NAK: 4193 callout_stop(&sp->pap_my_to_ch); 4194 if (debug) { 4195 log(LOG_INFO, SPP_FMT "pap failure", 4196 SPP_ARGS(ifp)); 4197 name_len = *(char *)h; 4198 if (len > 5 && name_len) { 4199 addlog(": "); 4200 sppp_print_string((char*)(h+1), name_len); 4201 } 4202 addlog("\n"); 4203 } else 4204 log(LOG_INFO, SPP_FMT "pap failure\n", 4205 SPP_ARGS(ifp)); 4206 /* await LCP shutdown by authenticator */ 4207 break; 4208 4209 default: 4210 /* Unknown PAP packet type -- ignore. */ 4211 if (debug) { 4212 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4213 "<0x%x id=0x%x len=%d", 4214 SPP_ARGS(ifp), 4215 h->type, h->ident, ntohs(h->len)); 4216 if (len > 4) 4217 sppp_print_bytes((u_char*)(h+1), len-4); 4218 addlog(">\n"); 4219 } 4220 break; 4221 4222 } 4223 } 4224 4225 static void 4226 sppp_pap_init(struct sppp *sp) 4227 { 4228 /* PAP doesn't have STATE_INITIAL at all. */ 4229 sp->state[IDX_PAP] = STATE_CLOSED; 4230 sp->fail_counter[IDX_PAP] = 0; 4231 sp->pp_seq[IDX_PAP] = 0; 4232 sp->pp_rseq[IDX_PAP] = 0; 4233 callout_init(&sp->ch[IDX_PAP]); 4234 callout_init(&sp->pap_my_to_ch); 4235 } 4236 4237 static void 4238 sppp_pap_open(struct sppp *sp) 4239 { 4240 if (sp->hisauth.proto == PPP_PAP && 4241 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4242 /* we are authenticator for PAP, start our timer */ 4243 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4244 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4245 } 4246 if (sp->myauth.proto == PPP_PAP) { 4247 /* we are peer, send a request, and start a timer */ 4248 pap.scr(sp); 4249 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4250 sppp_pap_my_TO, sp); 4251 } 4252 } 4253 4254 static void 4255 sppp_pap_close(struct sppp *sp) 4256 { 4257 if (sp->state[IDX_PAP] != STATE_CLOSED) 4258 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4259 } 4260 4261 /* 4262 * That's the timeout routine if we are authenticator. Since the 4263 * authenticator is basically passive in PAP, we can't do much here. 4264 */ 4265 static void 4266 sppp_pap_TO(void *cookie) 4267 { 4268 struct sppp *sp = (struct sppp *)cookie; 4269 STDDCL; 4270 int s; 4271 4272 s = splnet(); 4273 if (debug) 4274 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n", 4275 SPP_ARGS(ifp), 4276 sppp_state_name(sp->state[IDX_PAP]), 4277 sp->rst_counter[IDX_PAP]); 4278 4279 if (--sp->rst_counter[IDX_PAP] < 0) 4280 /* TO- event */ 4281 switch (sp->state[IDX_PAP]) { 4282 case STATE_REQ_SENT: 4283 pap.tld(sp); 4284 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4285 break; 4286 } 4287 else 4288 /* TO+ event, not very much we could do */ 4289 switch (sp->state[IDX_PAP]) { 4290 case STATE_REQ_SENT: 4291 /* sppp_cp_change_state() will restart the timer */ 4292 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4293 break; 4294 } 4295 4296 splx(s); 4297 } 4298 4299 /* 4300 * That's the timeout handler if we are peer. Since the peer is active, 4301 * we need to retransmit our PAP request since it is apparently lost. 4302 * XXX We should impose a max counter. 4303 */ 4304 static void 4305 sppp_pap_my_TO(void *cookie) 4306 { 4307 struct sppp *sp = (struct sppp *)cookie; 4308 STDDCL; 4309 4310 if (debug) 4311 log(LOG_DEBUG, SPP_FMT "pap peer TO\n", 4312 SPP_ARGS(ifp)); 4313 4314 pap.scr(sp); 4315 } 4316 4317 static void 4318 sppp_pap_tlu(struct sppp *sp) 4319 { 4320 STDDCL; 4321 int x; 4322 4323 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4324 4325 if (debug) 4326 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 4327 SPP_ARGS(ifp), pap.name); 4328 4329 x = splnet(); 4330 /* indicate to LCP that we need to be closed down */ 4331 sp->lcp.protos |= (1 << IDX_PAP); 4332 4333 if (sp->pp_flags & PP_NEEDAUTH) { 4334 /* 4335 * Remote is authenticator, but his auth proto didn't 4336 * complete yet. Defer the transition to network 4337 * phase. 4338 */ 4339 splx(x); 4340 return; 4341 } 4342 splx(x); 4343 sppp_phase_network(sp); 4344 } 4345 4346 static void 4347 sppp_pap_tld(struct sppp *sp) 4348 { 4349 STDDCL; 4350 4351 if (debug) 4352 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp)); 4353 callout_stop(&sp->ch[IDX_PAP]); 4354 callout_stop(&sp->pap_my_to_ch); 4355 sp->lcp.protos &= ~(1 << IDX_PAP); 4356 4357 lcp.Close(sp); 4358 } 4359 4360 static void 4361 sppp_pap_scr(struct sppp *sp) 4362 { 4363 u_char idlen, pwdlen; 4364 4365 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4366 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN); 4367 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN); 4368 4369 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4370 sizeof idlen, (const char *)&idlen, 4371 (size_t)idlen, sp->myauth.name, 4372 sizeof pwdlen, (const char *)&pwdlen, 4373 (size_t)pwdlen, sp->myauth.secret, 4374 0); 4375 } 4376 /* 4378 * Random miscellaneous functions. 4379 */ 4380 4381 /* 4382 * Send a PAP or CHAP proto packet. 4383 * 4384 * Varadic function, each of the elements for the ellipsis is of type 4385 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4386 * mlen == 0. 4387 * NOTE: never declare variadic functions with types subject to type 4388 * promotion (i.e. u_char). This is asking for big trouble depending 4389 * on the architecture you are on... 4390 */ 4391 4392 static void 4393 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4394 unsigned int type, unsigned int id, 4395 ...) 4396 { 4397 STDDCL; 4398 struct lcp_header *lh; 4399 struct mbuf *m; 4400 u_char *p; 4401 int len; 4402 size_t pkthdrlen; 4403 unsigned int mlen; 4404 const char *msg; 4405 va_list ap; 4406 4407 MGETHDR (m, M_DONTWAIT, MT_DATA); 4408 if (! m) 4409 return; 4410 m->m_pkthdr.rcvif = 0; 4411 4412 if (sp->pp_flags & PP_NOFRAMING) { 4413 *mtod(m, u_int16_t*) = htons(cp->proto); 4414 pkthdrlen = 2; 4415 lh = (struct lcp_header*)(mtod(m, u_int8_t*)+2); 4416 } else { 4417 struct ppp_header *h; 4418 h = mtod (m, struct ppp_header*); 4419 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4420 h->control = PPP_UI; /* Unnumbered Info */ 4421 h->protocol = htons(cp->proto); 4422 pkthdrlen = PPP_HEADER_LEN; 4423 4424 lh = (struct lcp_header*)(h + 1); 4425 } 4426 4427 lh->type = type; 4428 lh->ident = id; 4429 p = (u_char*) (lh+1); 4430 4431 va_start(ap, id); 4432 len = 0; 4433 4434 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4435 msg = va_arg(ap, const char *); 4436 len += mlen; 4437 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4438 va_end(ap); 4439 m_freem(m); 4440 return; 4441 } 4442 4443 bcopy(msg, p, mlen); 4444 p += mlen; 4445 } 4446 va_end(ap); 4447 4448 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4449 lh->len = htons (LCP_HEADER_LEN + len); 4450 4451 if (debug) { 4452 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 4453 SPP_ARGS(ifp), cp->name, 4454 sppp_auth_type_name(cp->proto, lh->type), 4455 lh->ident, ntohs(lh->len)); 4456 if (len) 4457 sppp_print_bytes((u_char*) (lh+1), len); 4458 addlog(">\n"); 4459 } 4460 if (IF_QFULL (&sp->pp_cpq)) { 4461 IF_DROP (&sp->pp_fastq); 4462 IF_DROP (&ifp->if_snd); 4463 m_freem (m); 4464 ++ifp->if_oerrors; 4465 } else 4466 IF_ENQUEUE (&sp->pp_cpq, m); 4467 if (! (ifp->if_flags & IFF_OACTIVE)) 4468 (*ifp->if_start) (ifp); 4469 ifp->if_obytes += m->m_pkthdr.len + 3; 4470 } 4471 4472 /* 4473 * Send keepalive packets, every 10 seconds. 4474 */ 4475 static void 4476 sppp_keepalive(void *dummy) 4477 { 4478 struct sppp *sp; 4479 int s; 4480 4481 s = splnet(); 4482 for (sp=spppq; sp; sp=sp->pp_next) { 4483 struct ifnet *ifp = &sp->pp_if; 4484 4485 /* Keepalive mode disabled or channel down? */ 4486 if (! (sp->pp_flags & PP_KEEPALIVE) || 4487 ! (ifp->if_flags & IFF_RUNNING)) 4488 continue; 4489 4490 /* No keepalive in PPP mode if LCP not opened yet. */ 4491 if (! (sp->pp_flags & PP_CISCO) && 4492 sp->pp_phase < PHASE_AUTHENTICATE) 4493 continue; 4494 4495 if (sp->pp_alivecnt == MAXALIVECNT) { 4496 /* No keepalive packets got. Stop the interface. */ 4497 if_down (ifp); 4498 IF_PURGE (&sp->pp_cpq); 4499 if (! (sp->pp_flags & PP_CISCO)) { 4500 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4501 ifp->if_xname); 4502 sp->pp_alivecnt = 0; 4503 4504 /* we are down, close all open protocols */ 4505 lcp.Close(sp); 4506 4507 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4508 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4509 4510 /* Close connection imediatly, completition of this 4511 * will summon the magic needed to reestablish it. */ 4512 sp->pp_tlf(sp); 4513 continue; 4514 } 4515 } 4516 if (sp->pp_alivecnt <= MAXALIVECNT) 4517 ++sp->pp_alivecnt; 4518 if (sp->pp_flags & PP_CISCO) 4519 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, 4520 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4521 else if (sp->pp_phase >= PHASE_AUTHENTICATE) { 4522 int32_t nmagic = htonl (sp->lcp.magic); 4523 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4524 sppp_cp_send (sp, PPP_LCP, ECHO_REQ, 4525 sp->lcp.echoid, 4, &nmagic); 4526 } 4527 } 4528 splx(s); 4529 callout_reset(&keepalive_ch, hz * 10, sppp_keepalive, NULL); 4530 } 4531 4532 /* 4533 * Get both IP addresses. 4534 */ 4535 static void 4536 sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, u_int32_t *srcmask) 4537 { 4538 struct ifnet *ifp = &sp->pp_if; 4539 struct ifaddr *ifa; 4540 struct sockaddr_in *si, *sm; 4541 u_int32_t ssrc, ddst; 4542 4543 sm = NULL; 4544 ssrc = ddst = 0; 4545 /* 4546 * Pick the first AF_INET address from the list, 4547 * aliases don't make any sense on a p2p link anyway. 4548 */ 4549 si = 0; 4550 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 4551 if (ifa->ifa_addr->sa_family == AF_INET) { 4552 si = (struct sockaddr_in *)ifa->ifa_addr; 4553 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4554 if (si) 4555 break; 4556 } 4557 } 4558 if (ifa) { 4559 if (si && si->sin_addr.s_addr) { 4560 ssrc = si->sin_addr.s_addr; 4561 if (srcmask) 4562 *srcmask = ntohl(sm->sin_addr.s_addr); 4563 } 4564 4565 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4566 if (si && si->sin_addr.s_addr) 4567 ddst = si->sin_addr.s_addr; 4568 } 4569 4570 if (dst) *dst = ntohl(ddst); 4571 if (src) *src = ntohl(ssrc); 4572 } 4573 4574 /* 4575 * Set IP addresses. Must be called at splnet. 4576 * If an address is 0, leave it the way it is. 4577 */ 4578 static void 4579 sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr) 4580 { 4581 STDDCL; 4582 struct ifaddr *ifa; 4583 struct sockaddr_in *si; 4584 struct sockaddr_in *dest; 4585 4586 /* 4587 * Pick the first AF_INET address from the list, 4588 * aliases don't make any sense on a p2p link anyway. 4589 */ 4590 4591 si = 0; 4592 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4593 { 4594 if (ifa->ifa_addr->sa_family == AF_INET) 4595 { 4596 si = (struct sockaddr_in *)ifa->ifa_addr; 4597 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4598 if (si) 4599 break; 4600 } 4601 } 4602 4603 if (ifa && si) 4604 { 4605 int error; 4606 struct sockaddr_in new_sin = *si; 4607 struct sockaddr_in new_dst = *dest; 4608 4609 /* 4610 * Scrub old routes now instead of calling in_ifinit with 4611 * scrub=1, because we may change the dstaddr 4612 * before the call to in_ifinit. 4613 */ 4614 in_ifscrub(ifp, ifatoia(ifa)); 4615 4616 if (myaddr != 0) 4617 new_sin.sin_addr.s_addr = htonl(myaddr); 4618 if (hisaddr != 0) { 4619 new_dst.sin_addr.s_addr = htonl(hisaddr); 4620 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4621 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4622 *dest = new_dst; /* fix dstaddr in place */ 4623 } 4624 } 4625 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4626 if(debug && error) 4627 { 4628 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addrs: in_ifinit " 4629 " failed, error=%d\n", SPP_ARGS(ifp), error); 4630 } 4631 } 4632 } 4633 4634 /* 4635 * Clear IP addresses. Must be called at splnet. 4636 */ 4637 static void 4638 sppp_clear_ip_addrs(struct sppp *sp) 4639 { 4640 struct ifnet *ifp = &sp->pp_if; 4641 struct ifaddr *ifa; 4642 struct sockaddr_in *si; 4643 struct sockaddr_in *dest; 4644 4645 u_int32_t remote; 4646 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4647 remote = sp->ipcp.saved_hisaddr; 4648 else 4649 sppp_get_ip_addrs(sp, 0, &remote, 0); 4650 4651 /* 4652 * Pick the first AF_INET address from the list, 4653 * aliases don't make any sense on a p2p link anyway. 4654 */ 4655 4656 si = 0; 4657 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4658 { 4659 if (ifa->ifa_addr->sa_family == AF_INET) 4660 { 4661 si = (struct sockaddr_in *)ifa->ifa_addr; 4662 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4663 if (si) 4664 break; 4665 } 4666 } 4667 4668 if (ifa && si) 4669 { 4670 struct sockaddr_in new_sin = *si; 4671 4672 in_ifscrub(ifp, ifatoia(ifa)); 4673 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4674 new_sin.sin_addr.s_addr = 0; 4675 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4676 /* replace peer addr in place */ 4677 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4678 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4679 } 4680 } 4681 4682 #ifdef INET6 4683 /* 4684 * Get both IPv6 addresses. 4685 */ 4686 static void 4687 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4688 struct in6_addr *srcmask) 4689 { 4690 struct ifnet *ifp = &sp->pp_if; 4691 struct ifaddr *ifa; 4692 struct sockaddr_in6 *si, *sm; 4693 struct in6_addr ssrc, ddst; 4694 4695 sm = NULL; 4696 memset(&ssrc, 0, sizeof(ssrc)); 4697 memset(&ddst, 0, sizeof(ddst)); 4698 /* 4699 * Pick the first link-local AF_INET6 address from the list, 4700 * aliases don't make any sense on a p2p link anyway. 4701 */ 4702 si = 0; 4703 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4704 if (ifa->ifa_addr->sa_family == AF_INET6) { 4705 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4706 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4707 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4708 break; 4709 } 4710 if (ifa) { 4711 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4712 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 4713 if (srcmask) { 4714 bcopy(&sm->sin6_addr, srcmask, 4715 sizeof(*srcmask)); 4716 } 4717 } 4718 4719 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4720 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4721 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 4722 } 4723 4724 if (dst) 4725 bcopy(&ddst, dst, sizeof(*dst)); 4726 if (src) 4727 bcopy(&ssrc, src, sizeof(*src)); 4728 } 4729 4730 #ifdef IPV6CP_MYIFID_DYN 4731 /* 4732 * Generate random ifid. 4733 */ 4734 static void 4735 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 4736 { 4737 /* TBD */ 4738 } 4739 4740 /* 4741 * Set my IPv6 address. Must be called at splnet. 4742 */ 4743 static void 4744 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 4745 { 4746 STDDCL; 4747 struct ifaddr *ifa; 4748 struct sockaddr_in6 *sin6; 4749 4750 /* 4751 * Pick the first link-local AF_INET6 address from the list, 4752 * aliases don't make any sense on a p2p link anyway. 4753 */ 4754 4755 sin6 = NULL; 4756 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4757 { 4758 if (ifa->ifa_addr->sa_family == AF_INET6) 4759 { 4760 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 4761 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 4762 break; 4763 } 4764 } 4765 4766 if (ifa && sin6) 4767 { 4768 int error; 4769 struct sockaddr_in6 new_sin6 = *sin6; 4770 4771 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 4772 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 4773 if (debug && error) 4774 { 4775 log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit " 4776 " failed, error=%d\n", SPP_ARGS(ifp), error); 4777 } 4778 } 4779 } 4780 #endif 4781 4782 /* 4783 * Suggest a candidate address to be used by peer. 4784 */ 4785 static void 4786 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 4787 { 4788 struct in6_addr myaddr; 4789 struct timeval tv; 4790 4791 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 4792 4793 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 4794 microtime(&tv); 4795 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 4796 myaddr.s6_addr[14] ^= 0xff; 4797 myaddr.s6_addr[15] ^= 0xff; 4798 } else { 4799 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 4800 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 4801 } 4802 if (suggest) 4803 bcopy(&myaddr, suggest, sizeof(myaddr)); 4804 } 4805 #endif /*INET6*/ 4806 4807 static int 4808 sppp_params(struct sppp *sp, int cmd, void *data) 4809 { 4810 struct ifreq *ifr = (struct ifreq *)data; 4811 struct spppreq spr; 4812 4813 #if 0 4814 /* 4815 * ifr->ifr_data is supposed to point to a struct spppreq. 4816 * Check the cmd word first before attempting to fetch all the 4817 * data. 4818 */ 4819 if ((subcmd = fuword(ifr->ifr_data)) == -1) 4820 return EFAULT; 4821 #endif 4822 4823 if (copyin((caddr_t)ifr->ifr_data, &spr, sizeof spr) != 0) 4824 return EFAULT; 4825 4826 switch (spr.cmd) { 4827 case SPPPIOGDEFS: 4828 if (cmd != (int)SIOCGIFGENERIC) 4829 return EINVAL; 4830 /* 4831 * We copy over the entire current state, but clean 4832 * out some of the stuff we don't wanna pass up. 4833 * Remember, SIOCGIFGENERIC is unprotected, and can be 4834 * called by any user. No need to ever get PAP or 4835 * CHAP secrets back to userland anyway. 4836 */ 4837 bcopy(sp, &spr.defs, sizeof(struct sppp)); 4838 memset(spr.defs.myauth.secret, 0, AUTHKEYLEN); 4839 memset(spr.defs.myauth.challenge, 0, AUTHKEYLEN); 4840 memset(spr.defs.hisauth.secret, 0, AUTHKEYLEN); 4841 memset(spr.defs.hisauth.challenge, 0, AUTHKEYLEN); 4842 return copyout(&spr, (caddr_t)ifr->ifr_data, sizeof spr); 4843 4844 case SPPPIOSDEFS: 4845 if (cmd != (int)SIOCSIFGENERIC) 4846 return EINVAL; 4847 /* 4848 * We have a very specific idea of which fields we allow 4849 * being passed back from userland, so to not clobber our 4850 * current state. For one, we only allow setting 4851 * anything if LCP is in dead phase. Once the LCP 4852 * negotiations started, the authentication settings must 4853 * not be changed again. (The administrator can force an 4854 * ifconfig down in order to get LCP back into dead 4855 * phase.) 4856 * 4857 * Also, we only allow for authentication parameters to be 4858 * specified. 4859 * 4860 * XXX Should allow to set or clear pp_flags. 4861 * 4862 * Finally, if the respective authentication protocol to 4863 * be used is set differently than 0, but the secret is 4864 * passed as all zeros, we don't trash the existing secret. 4865 * This allows an administrator to change the system name 4866 * only without clobbering the secret (which he didn't get 4867 * back in a previous SPPPIOGDEFS call). However, the 4868 * secrets are cleared if the authentication protocol is 4869 * reset to 0. 4870 */ 4871 if (sp->pp_phase != PHASE_DEAD) 4872 return EBUSY; 4873 4874 if ((spr.defs.myauth.proto != 0 && spr.defs.myauth.proto != PPP_PAP && 4875 spr.defs.myauth.proto != PPP_CHAP) || 4876 (spr.defs.hisauth.proto != 0 && spr.defs.hisauth.proto != PPP_PAP && 4877 spr.defs.hisauth.proto != PPP_CHAP)) 4878 return EINVAL; 4879 4880 if (spr.defs.myauth.proto == 0) 4881 /* resetting myauth */ 4882 memset(&sp->myauth, 0, sizeof sp->myauth); 4883 else { 4884 /* setting/changing myauth */ 4885 sp->myauth.proto = spr.defs.myauth.proto; 4886 bcopy(spr.defs.myauth.name, sp->myauth.name, AUTHNAMELEN); 4887 if (spr.defs.myauth.secret[0] != '\0') 4888 bcopy(spr.defs.myauth.secret, sp->myauth.secret, 4889 AUTHKEYLEN); 4890 } 4891 if (spr.defs.hisauth.proto == 0) 4892 /* resetting hisauth */ 4893 memset(&sp->hisauth, 0, sizeof sp->hisauth); 4894 else { 4895 /* setting/changing hisauth */ 4896 sp->hisauth.proto = spr.defs.hisauth.proto; 4897 sp->hisauth.flags = spr.defs.hisauth.flags; 4898 bcopy(spr.defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN); 4899 if (spr.defs.hisauth.secret[0] != '\0') 4900 bcopy(spr.defs.hisauth.secret, sp->hisauth.secret, 4901 AUTHKEYLEN); 4902 } 4903 break; 4904 4905 default: 4906 return EINVAL; 4907 } 4908 4909 return 0; 4910 } 4911 4912 static void 4913 sppp_phase_network(struct sppp *sp) 4914 { 4915 STDDCL; 4916 int i; 4917 u_int32_t mask; 4918 4919 sp->pp_phase = PHASE_NETWORK; 4920 4921 if(debug) 4922 { 4923 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 4924 sppp_phase_name(sp->pp_phase)); 4925 } 4926 4927 /* Notify NCPs now. */ 4928 for (i = 0; i < IDX_COUNT; i++) 4929 if ((cps[i])->flags & CP_NCP) 4930 (cps[i])->Open(sp); 4931 4932 /* Send Up events to all NCPs. */ 4933 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 4934 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 4935 (cps[i])->Up(sp); 4936 4937 /* if no NCP is starting, all this was in vain, close down */ 4938 sppp_lcp_check_and_close(sp); 4939 } 4940 4941 4942 static const char * 4943 sppp_cp_type_name(u_char type) 4944 { 4945 static char buf[12]; 4946 switch (type) { 4947 case CONF_REQ: return "conf-req"; 4948 case CONF_ACK: return "conf-ack"; 4949 case CONF_NAK: return "conf-nak"; 4950 case CONF_REJ: return "conf-rej"; 4951 case TERM_REQ: return "term-req"; 4952 case TERM_ACK: return "term-ack"; 4953 case CODE_REJ: return "code-rej"; 4954 case PROTO_REJ: return "proto-rej"; 4955 case ECHO_REQ: return "echo-req"; 4956 case ECHO_REPLY: return "echo-reply"; 4957 case DISC_REQ: return "discard-req"; 4958 } 4959 sprintf (buf, "0x%x", type); 4960 return buf; 4961 } 4962 4963 static const char * 4964 sppp_auth_type_name(u_short proto, u_char type) 4965 { 4966 static char buf[12]; 4967 switch (proto) { 4968 case PPP_CHAP: 4969 switch (type) { 4970 case CHAP_CHALLENGE: return "challenge"; 4971 case CHAP_RESPONSE: return "response"; 4972 case CHAP_SUCCESS: return "success"; 4973 case CHAP_FAILURE: return "failure"; 4974 } 4975 case PPP_PAP: 4976 switch (type) { 4977 case PAP_REQ: return "req"; 4978 case PAP_ACK: return "ack"; 4979 case PAP_NAK: return "nak"; 4980 } 4981 } 4982 sprintf (buf, "0x%x", type); 4983 return buf; 4984 } 4985 4986 static const char * 4987 sppp_lcp_opt_name(u_char opt) 4988 { 4989 static char buf[12]; 4990 switch (opt) { 4991 case LCP_OPT_MRU: return "mru"; 4992 case LCP_OPT_ASYNC_MAP: return "async-map"; 4993 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 4994 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 4995 case LCP_OPT_MAGIC: return "magic"; 4996 case LCP_OPT_PROTO_COMP: return "proto-comp"; 4997 case LCP_OPT_ADDR_COMP: return "addr-comp"; 4998 } 4999 sprintf (buf, "0x%x", opt); 5000 return buf; 5001 } 5002 5003 static const char * 5004 sppp_ipcp_opt_name(u_char opt) 5005 { 5006 static char buf[12]; 5007 switch (opt) { 5008 case IPCP_OPT_ADDRESSES: return "addresses"; 5009 case IPCP_OPT_COMPRESSION: return "compression"; 5010 case IPCP_OPT_ADDRESS: return "address"; 5011 } 5012 sprintf (buf, "0x%x", opt); 5013 return buf; 5014 } 5015 5016 #ifdef INET6 5017 static const char * 5018 sppp_ipv6cp_opt_name(u_char opt) 5019 { 5020 static char buf[12]; 5021 switch (opt) { 5022 case IPV6CP_OPT_IFID: return "ifid"; 5023 case IPV6CP_OPT_COMPRESSION: return "compression"; 5024 } 5025 sprintf (buf, "0x%x", opt); 5026 return buf; 5027 } 5028 #endif 5029 5030 static const char * 5031 sppp_state_name(int state) 5032 { 5033 switch (state) { 5034 case STATE_INITIAL: return "initial"; 5035 case STATE_STARTING: return "starting"; 5036 case STATE_CLOSED: return "closed"; 5037 case STATE_STOPPED: return "stopped"; 5038 case STATE_CLOSING: return "closing"; 5039 case STATE_STOPPING: return "stopping"; 5040 case STATE_REQ_SENT: return "req-sent"; 5041 case STATE_ACK_RCVD: return "ack-rcvd"; 5042 case STATE_ACK_SENT: return "ack-sent"; 5043 case STATE_OPENED: return "opened"; 5044 } 5045 return "illegal"; 5046 } 5047 5048 static const char * 5049 sppp_phase_name(enum ppp_phase phase) 5050 { 5051 switch (phase) { 5052 case PHASE_DEAD: return "dead"; 5053 case PHASE_ESTABLISH: return "establish"; 5054 case PHASE_TERMINATE: return "terminate"; 5055 case PHASE_AUTHENTICATE: return "authenticate"; 5056 case PHASE_NETWORK: return "network"; 5057 } 5058 return "illegal"; 5059 } 5060 5061 static const char * 5062 sppp_proto_name(u_short proto) 5063 { 5064 static char buf[12]; 5065 switch (proto) { 5066 case PPP_LCP: return "lcp"; 5067 case PPP_IPCP: return "ipcp"; 5068 case PPP_PAP: return "pap"; 5069 case PPP_CHAP: return "chap"; 5070 case PPP_IPV6CP: return "ipv6cp"; 5071 } 5072 sprintf(buf, "0x%x", (unsigned)proto); 5073 return buf; 5074 } 5075 5076 static void 5077 sppp_print_bytes(const u_char *p, u_short len) 5078 { 5079 addlog(" %02x", *p++); 5080 while (--len > 0) 5081 addlog("-%02x", *p++); 5082 } 5083 5084 static void 5085 sppp_print_string(const char *p, u_short len) 5086 { 5087 u_char c; 5088 5089 while (len-- > 0) { 5090 c = *p++; 5091 /* 5092 * Print only ASCII chars directly. RFC 1994 recommends 5093 * using only them, but we don't rely on it. */ 5094 if (c < ' ' || c > '~') 5095 addlog("\\x%x", c); 5096 else 5097 addlog("%c", c); 5098 } 5099 } 5100 5101 static const char * 5102 sppp_dotted_quad(u_int32_t addr) 5103 { 5104 static char s[16]; 5105 sprintf(s, "%d.%d.%d.%d", 5106 (int)((addr >> 24) & 0xff), 5107 (int)((addr >> 16) & 0xff), 5108 (int)((addr >> 8) & 0xff), 5109 (int)(addr & 0xff)); 5110 return s; 5111 } 5112 5113 static int 5114 sppp_strnlen(u_char *p, int max) 5115 { 5116 int len; 5117 5118 for (len = 0; len < max && *p; ++p) 5119 ++len; 5120 return len; 5121 } 5122 5123 /* a dummy, used to drop uninteresting events */ 5124 static void 5125 sppp_null(struct sppp *unused) 5126 { 5127 /* do just nothing */ 5128 } 5129 /* 5130 * This file is large. Tell emacs to highlight it nevertheless. 5131 * 5132 * Local Variables: 5133 * hilit-auto-highlight-maxout: 120000 5134 * End: 5135 */ 5136
Indexes created Tue Oct 14 11:09:46 GMT 2025