if_spppsubr.c revision 1.33
1 /* $NetBSD: if_spppsubr.c,v 1.33 2001/12/15 20:40:37 martin Exp $ */ 2 3 /* 4 * Synchronous PPP/Cisco link level subroutines. 5 * Keepalive protocol implemented in both Cisco and PPP modes. 6 * 7 * Copyright (C) 1994-1996 Cronyx Engineering Ltd. 8 * Author: Serge Vakulenko, <vak (at) cronyx.ru> 9 * 10 * Heavily revamped to conform to RFC 1661. 11 * Copyright (C) 1997, Joerg Wunsch. 12 * 13 * RFC2472 IPv6CP support. 14 * Copyright (C) 2000, Jun-ichiro itojun Hagino <itojun (at) iijlab.net>. 15 * 16 * This software is distributed with NO WARRANTIES, not even the implied 17 * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 18 * 19 * Authors grant any other persons or organisations permission to use 20 * or modify this software as long as this message is kept with the software, 21 * all derivative works or modified versions. 22 * 23 * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997 24 * 25 * From: if_spppsubr.c,v 1.39 1998/04/04 13:26:03 phk Exp 26 * 27 * From: Id: if_spppsubr.c,v 1.23 1999/02/23 14:47:50 hm Exp 28 */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: if_spppsubr.c,v 1.33 2001/12/15 20:40:37 martin Exp $"); 32 33 #include "opt_inet.h" 34 #include "opt_ipx.h" 35 #include "opt_iso.h" 36 #include "opt_ns.h" 37 38 #include <sys/param.h> 39 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/sockio.h> 43 #include <sys/socket.h> 44 #include <sys/syslog.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 48 #include <sys/md5.h> 49 50 #include <net/if.h> 51 #include <net/netisr.h> 52 #include <net/if_types.h> 53 #include <net/route.h> 54 #include <net/ppp_defs.h> 55 56 #include <machine/stdarg.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_systm.h> 60 #include <netinet/in_var.h> 61 #ifdef INET 62 #include <netinet/ip.h> 63 #include <netinet/tcp.h> 64 #endif 65 #include <net/ethertypes.h> 66 67 #ifdef IPX 68 #include <netipx/ipx.h> 69 #include <netipx/ipx_if.h> 70 #endif 71 72 #ifdef NS 73 #include <netns/ns.h> 74 #include <netns/ns_if.h> 75 #endif 76 77 #ifdef ISO 78 #include <netiso/argo_debug.h> 79 #include <netiso/iso.h> 80 #include <netiso/iso_var.h> 81 #include <netiso/iso_snpac.h> 82 #endif 83 84 #include <net/if_sppp.h> 85 86 #define MAXALIVECNT 3 /* max. alive packets */ 87 88 /* 89 * Interface flags that can be set in an ifconfig command. 90 * 91 * Setting link0 will make the link passive, i.e. it will be marked 92 * as being administrative openable, but won't be opened to begin 93 * with. Incoming calls will be answered, or subsequent calls with 94 * -link1 will cause the administrative open of the LCP layer. 95 * 96 * Setting link1 will cause the link to auto-dial only as packets 97 * arrive to be sent. 98 * 99 * Setting IFF_DEBUG will syslog the option negotiation and state 100 * transitions at level kern.debug. Note: all logs consistently look 101 * like 102 * 103 * <if-name><unit>: <proto-name> <additional info...> 104 * 105 * with <if-name><unit> being something like "bppp0", and <proto-name> 106 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 107 */ 108 109 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 110 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 111 112 #define CONF_REQ 1 /* PPP configure request */ 113 #define CONF_ACK 2 /* PPP configure acknowledge */ 114 #define CONF_NAK 3 /* PPP configure negative ack */ 115 #define CONF_REJ 4 /* PPP configure reject */ 116 #define TERM_REQ 5 /* PPP terminate request */ 117 #define TERM_ACK 6 /* PPP terminate acknowledge */ 118 #define CODE_REJ 7 /* PPP code reject */ 119 #define PROTO_REJ 8 /* PPP protocol reject */ 120 #define ECHO_REQ 9 /* PPP echo request */ 121 #define ECHO_REPLY 10 /* PPP echo reply */ 122 #define DISC_REQ 11 /* PPP discard request */ 123 124 #define LCP_OPT_MRU 1 /* maximum receive unit */ 125 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 126 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 127 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 128 #define LCP_OPT_MAGIC 5 /* magic number */ 129 #define LCP_OPT_RESERVED 6 /* reserved */ 130 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 131 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 132 133 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 134 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 135 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 136 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 137 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 138 139 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 140 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 141 142 #define PAP_REQ 1 /* PAP name/password request */ 143 #define PAP_ACK 2 /* PAP acknowledge */ 144 #define PAP_NAK 3 /* PAP fail */ 145 146 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 147 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 148 #define CHAP_SUCCESS 3 /* CHAP response ok */ 149 #define CHAP_FAILURE 4 /* CHAP response failed */ 150 151 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 152 153 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 154 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 155 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 156 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 157 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 158 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 159 160 /* states are named and numbered according to RFC 1661 */ 161 #define STATE_INITIAL 0 162 #define STATE_STARTING 1 163 #define STATE_CLOSED 2 164 #define STATE_STOPPED 3 165 #define STATE_CLOSING 4 166 #define STATE_STOPPING 5 167 #define STATE_REQ_SENT 6 168 #define STATE_ACK_RCVD 7 169 #define STATE_ACK_SENT 8 170 #define STATE_OPENED 9 171 172 struct ppp_header { 173 u_char address; 174 u_char control; 175 u_short protocol; 176 } __attribute__((__packed__)); 177 #define PPP_HEADER_LEN sizeof (struct ppp_header) 178 179 struct lcp_header { 180 u_char type; 181 u_char ident; 182 u_short len; 183 } __attribute__((__packed__)); 184 #define LCP_HEADER_LEN sizeof (struct lcp_header) 185 186 struct cisco_packet { 187 u_int32_t type; 188 u_int32_t par1; 189 u_int32_t par2; 190 u_short rel; 191 u_short time0; 192 u_short time1; 193 } __attribute__((__packed__)); 194 #define CISCO_PACKET_LEN 18 195 196 /* 197 * We follow the spelling and capitalization of RFC 1661 here, to make 198 * it easier comparing with the standard. Please refer to this RFC in 199 * case you can't make sense out of these abbreviation; it will also 200 * explain the semantics related to the various events and actions. 201 */ 202 struct cp { 203 u_short proto; /* PPP control protocol number */ 204 u_char protoidx; /* index into state table in struct sppp */ 205 u_char flags; 206 #define CP_LCP 0x01 /* this is the LCP */ 207 #define CP_AUTH 0x02 /* this is an authentication protocol */ 208 #define CP_NCP 0x04 /* this is a NCP */ 209 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 210 const char *name; /* name of this control protocol */ 211 /* event handlers */ 212 void (*Up)(struct sppp *sp); 213 void (*Down)(struct sppp *sp); 214 void (*Open)(struct sppp *sp); 215 void (*Close)(struct sppp *sp); 216 void (*TO)(void *sp); 217 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 218 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 219 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 220 /* actions */ 221 void (*tlu)(struct sppp *sp); 222 void (*tld)(struct sppp *sp); 223 void (*tls)(struct sppp *sp); 224 void (*tlf)(struct sppp *sp); 225 void (*scr)(struct sppp *sp); 226 }; 227 228 static struct sppp *spppq; 229 static struct callout keepalive_ch; 230 231 #ifdef __FreeBSD__ 232 #define SPP_FMT "%s%d: " 233 #define SPP_ARGS(ifp) (ifp)->if_name, (ifp)->if_unit 234 #else 235 #define SPP_FMT "%s: " 236 #define SPP_ARGS(ifp) (ifp)->if_xname 237 #endif 238 239 #ifdef INET 240 /* 241 * The following disgusting hack gets around the problem that IP TOS 242 * can't be set yet. We want to put "interactive" traffic on a high 243 * priority queue. To decide if traffic is interactive, we check that 244 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 245 * 246 * XXX is this really still necessary? - joerg - 247 */ 248 static u_short interactive_ports[8] = { 249 0, 513, 0, 0, 250 0, 21, 0, 23, 251 }; 252 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 253 #endif 254 255 /* almost every function needs these */ 256 #define STDDCL \ 257 struct ifnet *ifp = &sp->pp_if; \ 258 int debug = ifp->if_flags & IFF_DEBUG 259 260 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 261 struct sockaddr *dst, struct rtentry *rt); 262 263 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 264 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 265 266 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 267 struct mbuf *m); 268 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 269 u_char ident, u_short len, void *data); 270 /* static void sppp_cp_timeout(void *arg); */ 271 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 272 int newstate); 273 static void sppp_auth_send(const struct cp *cp, 274 struct sppp *sp, unsigned int type, unsigned int id, 275 ...); 276 277 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 278 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 279 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 280 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 281 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 282 283 static void sppp_null(struct sppp *sp); 284 285 static void sppp_lcp_init(struct sppp *sp); 286 static void sppp_lcp_up(struct sppp *sp); 287 static void sppp_lcp_down(struct sppp *sp); 288 static void sppp_lcp_open(struct sppp *sp); 289 static void sppp_lcp_close(struct sppp *sp); 290 static void sppp_lcp_TO(void *sp); 291 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 292 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 293 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 294 static void sppp_lcp_tlu(struct sppp *sp); 295 static void sppp_lcp_tld(struct sppp *sp); 296 static void sppp_lcp_tls(struct sppp *sp); 297 static void sppp_lcp_tlf(struct sppp *sp); 298 static void sppp_lcp_scr(struct sppp *sp); 299 static void sppp_lcp_check_and_close(struct sppp *sp); 300 static int sppp_ncp_check(struct sppp *sp); 301 302 static void sppp_ipcp_init(struct sppp *sp); 303 static void sppp_ipcp_up(struct sppp *sp); 304 static void sppp_ipcp_down(struct sppp *sp); 305 static void sppp_ipcp_open(struct sppp *sp); 306 static void sppp_ipcp_close(struct sppp *sp); 307 static void sppp_ipcp_TO(void *sp); 308 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 309 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 310 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 311 static void sppp_ipcp_tlu(struct sppp *sp); 312 static void sppp_ipcp_tld(struct sppp *sp); 313 static void sppp_ipcp_tls(struct sppp *sp); 314 static void sppp_ipcp_tlf(struct sppp *sp); 315 static void sppp_ipcp_scr(struct sppp *sp); 316 317 static void sppp_ipv6cp_init(struct sppp *sp); 318 static void sppp_ipv6cp_up(struct sppp *sp); 319 static void sppp_ipv6cp_down(struct sppp *sp); 320 static void sppp_ipv6cp_open(struct sppp *sp); 321 static void sppp_ipv6cp_close(struct sppp *sp); 322 static void sppp_ipv6cp_TO(void *sp); 323 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 324 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 325 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 326 static void sppp_ipv6cp_tlu(struct sppp *sp); 327 static void sppp_ipv6cp_tld(struct sppp *sp); 328 static void sppp_ipv6cp_tls(struct sppp *sp); 329 static void sppp_ipv6cp_tlf(struct sppp *sp); 330 static void sppp_ipv6cp_scr(struct sppp *sp); 331 332 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 333 static void sppp_pap_init(struct sppp *sp); 334 static void sppp_pap_open(struct sppp *sp); 335 static void sppp_pap_close(struct sppp *sp); 336 static void sppp_pap_TO(void *sp); 337 static void sppp_pap_my_TO(void *sp); 338 static void sppp_pap_tlu(struct sppp *sp); 339 static void sppp_pap_tld(struct sppp *sp); 340 static void sppp_pap_scr(struct sppp *sp); 341 342 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 343 static void sppp_chap_init(struct sppp *sp); 344 static void sppp_chap_open(struct sppp *sp); 345 static void sppp_chap_close(struct sppp *sp); 346 static void sppp_chap_TO(void *sp); 347 static void sppp_chap_tlu(struct sppp *sp); 348 static void sppp_chap_tld(struct sppp *sp); 349 static void sppp_chap_scr(struct sppp *sp); 350 351 static const char *sppp_auth_type_name(u_short proto, u_char type); 352 static const char *sppp_cp_type_name(u_char type); 353 static const char *sppp_dotted_quad(u_int32_t addr); 354 static const char *sppp_ipcp_opt_name(u_char opt); 355 #ifdef INET6 356 static const char *sppp_ipv6cp_opt_name(u_char opt); 357 #endif 358 static const char *sppp_lcp_opt_name(u_char opt); 359 static const char *sppp_phase_name(enum ppp_phase phase); 360 static const char *sppp_proto_name(u_short proto); 361 static const char *sppp_state_name(int state); 362 static int sppp_params(struct sppp *sp, int cmd, void *data); 363 static int sppp_strnlen(u_char *p, int max); 364 static void sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, 365 u_int32_t *srcmask); 366 static void sppp_keepalive(void *dummy); 367 static void sppp_phase_network(struct sppp *sp); 368 static void sppp_print_bytes(const u_char *p, u_short len); 369 static void sppp_print_string(const char *p, u_short len); 370 static void sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr); 371 static void sppp_clear_ip_addrs(struct sppp *sp); 372 #ifdef INET6 373 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 374 struct in6_addr *dst, struct in6_addr *srcmask); 375 #ifdef IPV6CP_MYIFID_DYN 376 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 377 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 378 #endif 379 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 380 #endif 381 382 /* our control protocol descriptors */ 383 static const struct cp lcp = { 384 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 385 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 386 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 387 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 388 sppp_lcp_scr 389 }; 390 391 static const struct cp ipcp = { 392 PPP_IPCP, IDX_IPCP, 393 #ifdef INET 394 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 395 #else 396 0, 397 #endif 398 "ipcp", 399 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 400 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 401 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 402 sppp_ipcp_scr 403 }; 404 405 static const struct cp ipv6cp = { 406 PPP_IPV6CP, IDX_IPV6CP, 407 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 408 CP_NCP, 409 #else 410 0, 411 #endif 412 "ipv6cp", 413 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 414 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 415 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 416 sppp_ipv6cp_scr 417 }; 418 419 static const struct cp pap = { 420 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 421 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 422 sppp_pap_TO, 0, 0, 0, 423 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 424 sppp_pap_scr 425 }; 426 427 static const struct cp chap = { 428 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 429 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 430 sppp_chap_TO, 0, 0, 0, 431 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 432 sppp_chap_scr 433 }; 434 435 static const struct cp *cps[IDX_COUNT] = { 436 &lcp, /* IDX_LCP */ 437 &ipcp, /* IDX_IPCP */ 438 &ipv6cp, /* IDX_IPV6CP */ 439 &pap, /* IDX_PAP */ 440 &chap, /* IDX_CHAP */ 441 }; 442 443 444 /* 446 * Exported functions, comprising our interface to the lower layer. 447 */ 448 449 /* 450 * Process the received packet. 451 */ 452 void 453 sppp_input(struct ifnet *ifp, struct mbuf *m) 454 { 455 struct ppp_header *h = NULL; 456 struct ifqueue *inq = 0; 457 u_int16_t protocol; 458 int s; 459 struct sppp *sp = (struct sppp *)ifp; 460 int debug = ifp->if_flags & IFF_DEBUG; 461 462 if (ifp->if_flags & IFF_UP) 463 /* Count received bytes, add hardware framing */ 464 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 465 466 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 467 /* Too small packet, drop it. */ 468 if (debug) 469 log(LOG_DEBUG, 470 SPP_FMT "input packet is too small, %d bytes\n", 471 SPP_ARGS(ifp), m->m_pkthdr.len); 472 drop: 473 ++ifp->if_ierrors; 474 ++ifp->if_iqdrops; 475 m_freem (m); 476 return; 477 } 478 479 if (sp->pp_flags & PP_NOFRAMING) { 480 memcpy(&protocol, mtod(m, void *), 2); 481 protocol = ntohs(protocol); 482 m_adj(m, 2); 483 } else { 484 485 /* Get PPP header. */ 486 h = mtod (m, struct ppp_header*); 487 m_adj (m, PPP_HEADER_LEN); 488 489 switch (h->address) { 490 case PPP_ALLSTATIONS: 491 if (h->control != PPP_UI) 492 goto invalid; 493 if (sp->pp_flags & PP_CISCO) { 494 if (debug) 495 log(LOG_DEBUG, 496 SPP_FMT "PPP packet in Cisco mode " 497 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 498 SPP_ARGS(ifp), 499 h->address, h->control, ntohs(h->protocol)); 500 goto drop; 501 } 502 break; 503 case CISCO_MULTICAST: 504 case CISCO_UNICAST: 505 /* Don't check the control field here (RFC 1547). */ 506 if (! (sp->pp_flags & PP_CISCO)) { 507 if (debug) 508 log(LOG_DEBUG, 509 SPP_FMT "Cisco packet in PPP mode " 510 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 511 SPP_ARGS(ifp), 512 h->address, h->control, ntohs(h->protocol)); 513 goto drop; 514 } 515 switch (ntohs (h->protocol)) { 516 default: 517 ++ifp->if_noproto; 518 goto invalid; 519 case CISCO_KEEPALIVE: 520 sppp_cisco_input ((struct sppp*) ifp, m); 521 m_freem (m); 522 return; 523 #ifdef INET 524 case ETHERTYPE_IP: 525 schednetisr (NETISR_IP); 526 inq = &ipintrq; 527 break; 528 #endif 529 #ifdef INET6 530 case ETHERTYPE_IPV6: 531 schednetisr (NETISR_IPV6); 532 inq = &ip6intrq; 533 break; 534 #endif 535 #ifdef IPX 536 case ETHERTYPE_IPX: 537 schednetisr (NETISR_IPX); 538 inq = &ipxintrq; 539 break; 540 #endif 541 #ifdef NS 542 case ETHERTYPE_NS: 543 schednetisr (NETISR_NS); 544 inq = &nsintrq; 545 break; 546 #endif 547 } 548 goto queue_pkt; 549 default: /* Invalid PPP packet. */ 550 invalid: 551 if (debug) 552 log(LOG_DEBUG, 553 SPP_FMT "invalid input packet " 554 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 555 SPP_ARGS(ifp), 556 h->address, h->control, ntohs(h->protocol)); 557 goto drop; 558 } 559 protocol = ntohs (h->protocol); 560 } 561 562 switch (protocol) { 563 default: 564 if (sp->state[IDX_LCP] == STATE_OPENED) { 565 u_int16_t prot = htons(protocol); 566 sppp_cp_send (sp, PPP_LCP, PROTO_REJ, 567 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 568 &prot); 569 } 570 if (debug) 571 log(LOG_DEBUG, 572 SPP_FMT "invalid input protocol " 573 "<proto=0x%x>\n", SPP_ARGS(ifp), ntohs(protocol)); 574 ++ifp->if_noproto; 575 goto drop; 576 case PPP_LCP: 577 sppp_cp_input(&lcp, sp, m); 578 m_freem (m); 579 return; 580 case PPP_PAP: 581 if (sp->pp_phase >= PHASE_AUTHENTICATE) 582 sppp_pap_input(sp, m); 583 m_freem (m); 584 return; 585 case PPP_CHAP: 586 if (sp->pp_phase >= PHASE_AUTHENTICATE) 587 sppp_chap_input(sp, m); 588 m_freem (m); 589 return; 590 #ifdef INET 591 case PPP_IPCP: 592 if (sp->pp_phase == PHASE_NETWORK) 593 sppp_cp_input(&ipcp, sp, m); 594 m_freem (m); 595 return; 596 case PPP_IP: 597 if (sp->state[IDX_IPCP] == STATE_OPENED) { 598 schednetisr (NETISR_IP); 599 inq = &ipintrq; 600 } 601 break; 602 #endif 603 #ifdef INET6 604 case PPP_IPV6CP: 605 if (sp->pp_phase == PHASE_NETWORK) 606 sppp_cp_input(&ipv6cp, sp, m); 607 m_freem (m); 608 return; 609 610 case PPP_IPV6: 611 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 612 schednetisr (NETISR_IPV6); 613 inq = &ip6intrq; 614 } 615 break; 616 #endif 617 #ifdef IPX 618 case PPP_IPX: 619 /* IPX IPXCP not implemented yet */ 620 if (sp->pp_phase == PHASE_NETWORK) { 621 schednetisr (NETISR_IPX); 622 inq = &ipxintrq; 623 } 624 break; 625 #endif 626 #ifdef NS 627 case PPP_XNS: 628 /* XNS IDPCP not implemented yet */ 629 if (sp->pp_phase == PHASE_NETWORK) { 630 schednetisr (NETISR_NS); 631 inq = &nsintrq; 632 } 633 break; 634 #endif 635 #ifdef ISO 636 case PPP_ISO: 637 /* OSI NLCP not implemented yet */ 638 if (sp->pp_phase == PHASE_NETWORK) { 639 schednetisr (NETISR_ISO); 640 inq = &clnlintrq; 641 } 642 break; 643 #endif 644 } 645 646 queue_pkt: 647 if (! (ifp->if_flags & IFF_UP) || ! inq) 648 goto drop; 649 650 /* Check queue. */ 651 s = splnet(); 652 if (IF_QFULL (inq)) { 653 /* Queue overflow. */ 654 IF_DROP(inq); 655 splx(s); 656 if (debug) 657 log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n", 658 SPP_ARGS(ifp)); 659 goto drop; 660 } 661 IF_ENQUEUE(inq, m); 662 splx(s); 663 } 664 665 /* 666 * Enqueue transmit packet. 667 */ 668 static int 669 sppp_output(struct ifnet *ifp, struct mbuf *m, 670 struct sockaddr *dst, struct rtentry *rt) 671 { 672 struct sppp *sp = (struct sppp*) ifp; 673 struct ppp_header *h = NULL; 674 struct ifqueue *ifq = NULL; /* XXX */ 675 int s, len, rv = 0; 676 u_int16_t protocol; 677 ALTQ_DECL(struct altq_pktattr pktattr;) 678 679 s = splnet(); 680 681 if ((ifp->if_flags & IFF_UP) == 0 || 682 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 683 m_freem (m); 684 splx (s); 685 return (ENETDOWN); 686 } 687 688 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 689 /* 690 * Interface is not yet running, but auto-dial. Need 691 * to start LCP for it. 692 */ 693 ifp->if_flags |= IFF_RUNNING; 694 splx(s); 695 lcp.Open(sp); 696 s = splnet(); 697 } 698 699 /* 700 * If the queueing discipline needs packet classification, 701 * do it before prepending link headers. 702 */ 703 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 704 705 #ifdef INET 706 if (dst->sa_family == AF_INET) 707 { 708 /* Check mbuf length here??? */ 709 struct ip *ip = mtod (m, struct ip*); 710 struct tcphdr *tcp = (struct tcphdr*) ((int32_t*)ip + ip->ip_hl); 711 712 /* 713 * When using dynamic local IP address assignment by using 714 * 0.0.0.0 as a local address, the first TCP session will 715 * not connect because the local TCP checksum is computed 716 * using 0.0.0.0 which will later become our real IP address 717 * so the TCP checksum computed at the remote end will 718 * become invalid. So we 719 * - don't let packets with src ip addr 0 thru 720 * - we flag TCP packets with src ip 0 as an error 721 */ 722 723 if(ip->ip_src.s_addr == INADDR_ANY) /* -hm */ 724 { 725 m_freem(m); 726 splx(s); 727 if(ip->ip_p == IPPROTO_TCP) 728 return(EADDRNOTAVAIL); 729 else 730 return(0); 731 } 732 733 /* 734 * Put low delay, telnet, rlogin and ftp control packets 735 * in front of the queue. 736 */ 737 738 if (! IF_QFULL (&sp->pp_fastq) && 739 ((ip->ip_tos & IPTOS_LOWDELAY) || 740 ((ip->ip_p == IPPROTO_TCP && 741 m->m_len >= sizeof (struct ip) + sizeof (struct tcphdr) && 742 (INTERACTIVE (ntohs (tcp->th_sport)))) || 743 INTERACTIVE (ntohs (tcp->th_dport))))) 744 ifq = &sp->pp_fastq; 745 } 746 #endif 747 748 #ifdef INET6 749 if (dst->sa_family == AF_INET6) { 750 /* XXX do something tricky here? */ 751 } 752 #endif 753 754 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 755 /* 756 * Prepend general data packet PPP header. For now, IP only. 757 */ 758 M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT); 759 if (! m) { 760 if (ifp->if_flags & IFF_DEBUG) 761 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n", 762 SPP_ARGS(ifp)); 763 ++ifp->if_oerrors; 764 splx (s); 765 return (ENOBUFS); 766 } 767 /* 768 * May want to check size of packet 769 * (albeit due to the implementation it's always enough) 770 */ 771 h = mtod (m, struct ppp_header*); 772 if (sp->pp_flags & PP_CISCO) { 773 h->address = CISCO_UNICAST; /* unicast address */ 774 h->control = 0; 775 } else { 776 h->address = PPP_ALLSTATIONS; /* broadcast address */ 777 h->control = PPP_UI; /* Unnumbered Info */ 778 } 779 } 780 781 switch (dst->sa_family) { 782 #ifdef INET 783 case AF_INET: /* Internet Protocol */ 784 if (sp->pp_flags & PP_CISCO) 785 protocol = htons (ETHERTYPE_IP); 786 else { 787 /* 788 * Don't choke with an ENETDOWN early. It's 789 * possible that we just started dialing out, 790 * so don't drop the packet immediately. If 791 * we notice that we run out of buffer space 792 * below, we will however remember that we are 793 * not ready to carry IP packets, and return 794 * ENETDOWN, as opposed to ENOBUFS. 795 */ 796 protocol = htons(PPP_IP); 797 if (sp->state[IDX_IPCP] != STATE_OPENED) 798 rv = ENETDOWN; 799 } 800 break; 801 #endif 802 #ifdef INET6 803 case AF_INET6: /* Internet Protocol version 6 */ 804 if (sp->pp_flags & PP_CISCO) 805 protocol = htons (ETHERTYPE_IPV6); 806 else { 807 /* 808 * Don't choke with an ENETDOWN early. It's 809 * possible that we just started dialing out, 810 * so don't drop the packet immediately. If 811 * we notice that we run out of buffer space 812 * below, we will however remember that we are 813 * not ready to carry IP packets, and return 814 * ENETDOWN, as opposed to ENOBUFS. 815 */ 816 protocol = htons(PPP_IPV6); 817 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 818 rv = ENETDOWN; 819 } 820 break; 821 #endif 822 #ifdef NS 823 case AF_NS: /* Xerox NS Protocol */ 824 protocol = htons ((sp->pp_flags & PP_CISCO) ? 825 ETHERTYPE_NS : PPP_XNS); 826 break; 827 #endif 828 #ifdef IPX 829 case AF_IPX: /* Novell IPX Protocol */ 830 protocol = htons ((sp->pp_flags & PP_CISCO) ? 831 ETHERTYPE_IPX : PPP_IPX); 832 break; 833 #endif 834 #ifdef ISO 835 case AF_ISO: /* ISO OSI Protocol */ 836 if (sp->pp_flags & PP_CISCO) 837 goto nosupport; 838 protocol = htons (PPP_ISO); 839 break; 840 nosupport: 841 #endif 842 default: 843 m_freem (m); 844 ++ifp->if_oerrors; 845 splx (s); 846 return (EAFNOSUPPORT); 847 } 848 849 if (sp->pp_flags & PP_NOFRAMING) { 850 M_PREPEND (m, 2, M_DONTWAIT); 851 if (m == NULL) { 852 if (ifp->if_flags & IFF_DEBUG) 853 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n", 854 SPP_ARGS(ifp)); 855 ++ifp->if_oerrors; 856 splx (s); 857 return (ENOBUFS); 858 } 859 *mtod(m, u_int16_t*) = protocol; 860 } else { 861 h->protocol = protocol; 862 } 863 864 /* 865 * Queue message on interface, and start output if interface 866 * not yet active. 867 */ 868 len = m->m_pkthdr.len; 869 if (ifq != NULL 870 #ifdef ALTQ 871 && ALTQ_IS_ENABLED(&ifp->if_snd) == 0 872 #endif 873 ) { 874 if (IF_QFULL (ifq)) { 875 IF_DROP (&ifp->if_snd); 876 m_freem (m); 877 if (rv == 0) 878 rv = ENOBUFS; 879 } 880 IF_ENQUEUE(ifq, m); 881 } else 882 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, rv); 883 if (rv != 0) { 884 ++ifp->if_oerrors; 885 splx(s); 886 return (rv); 887 } 888 889 if (! (ifp->if_flags & IFF_OACTIVE)) 890 (*ifp->if_start) (ifp); 891 892 /* 893 * Count output packets and bytes. 894 * The packet length includes header + additional hardware framing 895 * according to RFC 1333. 896 */ 897 ifp->if_obytes += len + sp->pp_framebytes; 898 splx (s); 899 return (0); 900 } 901 902 void 903 sppp_attach(struct ifnet *ifp) 904 { 905 struct sppp *sp = (struct sppp*) ifp; 906 907 /* Initialize keepalive handler. */ 908 if (! spppq) { 909 callout_init(&keepalive_ch); 910 callout_reset(&keepalive_ch, hz * 10, sppp_keepalive, NULL); 911 } 912 913 /* Insert new entry into the keepalive list. */ 914 sp->pp_next = spppq; 915 spppq = sp; 916 917 sp->pp_if.if_type = IFT_PPP; 918 sp->pp_if.if_output = sppp_output; 919 sp->pp_fastq.ifq_maxlen = 32; 920 sp->pp_cpq.ifq_maxlen = 20; 921 sp->pp_loopcnt = 0; 922 sp->pp_alivecnt = 0; 923 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 924 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 925 sp->pp_phase = PHASE_DEAD; 926 sp->pp_up = lcp.Up; 927 sp->pp_down = lcp.Down; 928 929 if_alloc_sadl(ifp); 930 931 sppp_lcp_init(sp); 932 sppp_ipcp_init(sp); 933 sppp_ipv6cp_init(sp); 934 sppp_pap_init(sp); 935 sppp_chap_init(sp); 936 } 937 938 void 939 sppp_detach(struct ifnet *ifp) 940 { 941 struct sppp **q, *p, *sp = (struct sppp*) ifp; 942 int i; 943 944 /* Remove the entry from the keepalive list. */ 945 for (q = &spppq; (p = *q); q = &p->pp_next) 946 if (p == sp) { 947 *q = p->pp_next; 948 break; 949 } 950 951 /* Stop keepalive handler. */ 952 if (! spppq) { 953 callout_stop(&keepalive_ch); 954 } 955 956 for (i = 0; i < IDX_COUNT; i++) { 957 callout_stop(&sp->ch[i]); 958 } 959 callout_stop(&sp->pap_my_to_ch); 960 961 if_free_sadl(ifp); 962 } 963 964 /* 965 * Flush the interface output queue. 966 */ 967 void 968 sppp_flush(struct ifnet *ifp) 969 { 970 struct sppp *sp = (struct sppp*) ifp; 971 972 IFQ_PURGE (&sp->pp_if.if_snd); 973 IF_PURGE (&sp->pp_fastq); 974 IF_PURGE (&sp->pp_cpq); 975 } 976 977 /* 978 * Check if the output queue is empty. 979 */ 980 int 981 sppp_isempty(struct ifnet *ifp) 982 { 983 struct sppp *sp = (struct sppp*) ifp; 984 int empty, s; 985 986 s = splnet(); 987 empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head && 988 !sp->pp_if.if_snd.ifq_head; 989 splx(s); 990 return (empty); 991 } 992 993 /* 994 * Get next packet to send. 995 */ 996 struct mbuf * 997 sppp_dequeue(struct ifnet *ifp) 998 { 999 struct sppp *sp = (struct sppp*) ifp; 1000 struct mbuf *m; 1001 int s; 1002 1003 s = splnet(); 1004 /* 1005 * Process only the control protocol queue until we have at 1006 * least one NCP open. 1007 * 1008 * Do always serve all three queues in Cisco mode. 1009 */ 1010 IF_DEQUEUE(&sp->pp_cpq, m); 1011 if (m == NULL && 1012 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1013 IF_DEQUEUE(&sp->pp_fastq, m); 1014 if (m == NULL) 1015 IF_DEQUEUE (&sp->pp_if.if_snd, m); 1016 } 1017 splx(s); 1018 return m; 1019 } 1020 1021 /* 1022 * Pick the next packet, do not remove it from the queue. 1023 */ 1024 struct mbuf * 1025 sppp_pick(struct ifnet *ifp) 1026 { 1027 struct sppp *sp = (struct sppp*)ifp; 1028 struct mbuf *m; 1029 int s; 1030 1031 s= splnet (); 1032 1033 m = sp->pp_cpq.ifq_head; 1034 if (m == NULL && 1035 (sp->pp_phase == PHASE_NETWORK || 1036 (sp->pp_flags & PP_CISCO) != 0)) 1037 if ((m = sp->pp_fastq.ifq_head) == NULL) 1038 m = sp->pp_if.if_snd.ifq_head; 1039 splx (s); 1040 return (m); 1041 } 1042 1043 /* 1044 * Process an ioctl request. Called on low priority level. 1045 */ 1046 int 1047 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1048 { 1049 struct ifreq *ifr = (struct ifreq*) data; 1050 struct sppp *sp = (struct sppp*) ifp; 1051 int s, rv, going_up, going_down, newmode; 1052 1053 s = splnet(); 1054 rv = 0; 1055 switch (cmd) { 1056 case SIOCAIFADDR: 1057 case SIOCSIFDSTADDR: 1058 break; 1059 1060 case SIOCSIFADDR: 1061 if_up(ifp); 1062 /* fall through... */ 1063 1064 case SIOCSIFFLAGS: 1065 going_up = ifp->if_flags & IFF_UP && 1066 (ifp->if_flags & IFF_RUNNING) == 0; 1067 going_down = (ifp->if_flags & IFF_UP) == 0 && 1068 ifp->if_flags & IFF_RUNNING; 1069 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1070 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1071 /* sanity */ 1072 newmode = IFF_PASSIVE; 1073 ifp->if_flags &= ~IFF_AUTO; 1074 } 1075 1076 if (going_up || going_down) 1077 lcp.Close(sp); 1078 if (going_up && newmode == 0) { 1079 /* neither auto-dial nor passive */ 1080 ifp->if_flags |= IFF_RUNNING; 1081 if (!(sp->pp_flags & PP_CISCO)) 1082 lcp.Open(sp); 1083 } else if (going_down) { 1084 sppp_flush(ifp); 1085 ifp->if_flags &= ~IFF_RUNNING; 1086 } 1087 1088 break; 1089 1090 #ifdef SIOCSIFMTU 1091 #ifndef ifr_mtu 1092 #define ifr_mtu ifr_metric 1093 #endif 1094 case SIOCSIFMTU: 1095 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) 1096 return (EINVAL); 1097 ifp->if_mtu = ifr->ifr_mtu; 1098 break; 1099 #endif 1100 #ifdef SLIOCSETMTU 1101 case SLIOCSETMTU: 1102 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru) 1103 return (EINVAL); 1104 ifp->if_mtu = *(short*)data; 1105 break; 1106 #endif 1107 #ifdef SIOCGIFMTU 1108 case SIOCGIFMTU: 1109 ifr->ifr_mtu = ifp->if_mtu; 1110 break; 1111 #endif 1112 #ifdef SLIOCGETMTU 1113 case SLIOCGETMTU: 1114 *(short*)data = ifp->if_mtu; 1115 break; 1116 #endif 1117 case SIOCADDMULTI: 1118 case SIOCDELMULTI: 1119 break; 1120 1121 case SIOCGIFGENERIC: 1122 case SIOCSIFGENERIC: 1123 rv = sppp_params(sp, cmd, data); 1124 break; 1125 1126 default: 1127 rv = ENOTTY; 1128 } 1129 splx(s); 1130 return rv; 1131 } 1132 1133 1134 /* 1136 * Cisco framing implementation. 1137 */ 1138 1139 /* 1140 * Handle incoming Cisco keepalive protocol packets. 1141 */ 1142 static void 1143 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1144 { 1145 STDDCL; 1146 struct cisco_packet *h; 1147 u_int32_t me, mymask; 1148 1149 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1150 if (debug) 1151 log(LOG_DEBUG, 1152 SPP_FMT "cisco invalid packet length: %d bytes\n", 1153 SPP_ARGS(ifp), m->m_pkthdr.len); 1154 return; 1155 } 1156 h = mtod (m, struct cisco_packet*); 1157 if (debug) 1158 log(LOG_DEBUG, 1159 SPP_FMT "cisco input: %d bytes " 1160 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1161 SPP_ARGS(ifp), m->m_pkthdr.len, 1162 ntohl (h->type), h->par1, h->par2, (u_int)h->rel, 1163 (u_int)h->time0, (u_int)h->time1); 1164 switch (ntohl (h->type)) { 1165 default: 1166 if (debug) 1167 addlog(SPP_FMT "cisco unknown packet type: 0x%x\n", 1168 SPP_ARGS(ifp), ntohl (h->type)); 1169 break; 1170 case CISCO_ADDR_REPLY: 1171 /* Reply on address request, ignore */ 1172 break; 1173 case CISCO_KEEPALIVE_REQ: 1174 sp->pp_alivecnt = 0; 1175 sp->pp_rseq[IDX_LCP] = ntohl (h->par1); 1176 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1177 /* Local and remote sequence numbers are equal. 1178 * Probably, the line is in loopback mode. */ 1179 if (sp->pp_loopcnt >= MAXALIVECNT) { 1180 printf (SPP_FMT "loopback\n", 1181 SPP_ARGS(ifp)); 1182 sp->pp_loopcnt = 0; 1183 if (ifp->if_flags & IFF_UP) { 1184 if_down (ifp); 1185 IF_PURGE (&sp->pp_cpq); 1186 } 1187 } 1188 ++sp->pp_loopcnt; 1189 1190 /* Generate new local sequence number */ 1191 sp->pp_seq[IDX_LCP] = random(); 1192 break; 1193 } 1194 sp->pp_loopcnt = 0; 1195 if (! (ifp->if_flags & IFF_UP) && 1196 (ifp->if_flags & IFF_RUNNING)) { 1197 if_up(ifp); 1198 printf (SPP_FMT "up\n", SPP_ARGS(ifp)); 1199 } 1200 break; 1201 case CISCO_ADDR_REQ: 1202 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1203 if (me != 0L) 1204 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1205 break; 1206 } 1207 } 1208 1209 /* 1210 * Send Cisco keepalive packet. 1211 */ 1212 static void 1213 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1214 { 1215 STDDCL; 1216 struct ppp_header *h; 1217 struct cisco_packet *ch; 1218 struct mbuf *m; 1219 u_int32_t t = (time.tv_sec - boottime.tv_sec) * 1000; 1220 1221 MGETHDR (m, M_DONTWAIT, MT_DATA); 1222 if (! m) 1223 return; 1224 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1225 m->m_pkthdr.rcvif = 0; 1226 1227 h = mtod (m, struct ppp_header*); 1228 h->address = CISCO_MULTICAST; 1229 h->control = 0; 1230 h->protocol = htons (CISCO_KEEPALIVE); 1231 1232 ch = (struct cisco_packet*) (h + 1); 1233 ch->type = htonl (type); 1234 ch->par1 = htonl (par1); 1235 ch->par2 = htonl (par2); 1236 ch->rel = -1; 1237 1238 ch->time0 = htons ((u_short) (t >> 16)); 1239 ch->time1 = htons ((u_short) t); 1240 1241 if (debug) 1242 log(LOG_DEBUG, 1243 SPP_FMT "cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1244 SPP_ARGS(ifp), ntohl (ch->type), ch->par1, 1245 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1246 (u_int)ch->time1); 1247 1248 if (IF_QFULL (&sp->pp_cpq)) { 1249 IF_DROP (&sp->pp_fastq); 1250 IF_DROP (&ifp->if_snd); 1251 m_freem (m); 1252 } else 1253 IF_ENQUEUE (&sp->pp_cpq, m); 1254 if (! (ifp->if_flags & IFF_OACTIVE)) 1255 (*ifp->if_start) (ifp); 1256 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1257 } 1258 1259 /* 1261 * PPP protocol implementation. 1262 */ 1263 1264 /* 1265 * Send PPP control protocol packet. 1266 */ 1267 static void 1268 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1269 u_char ident, u_short len, void *data) 1270 { 1271 STDDCL; 1272 struct lcp_header *lh; 1273 struct mbuf *m; 1274 size_t pkthdrlen; 1275 1276 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1277 1278 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1279 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1280 MGETHDR (m, M_DONTWAIT, MT_DATA); 1281 if (! m) 1282 return; 1283 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1284 m->m_pkthdr.rcvif = 0; 1285 1286 if (sp->pp_flags & PP_NOFRAMING) { 1287 *mtod(m, u_int16_t*) = htons(proto); 1288 lh = (struct lcp_header*)(mtod(m, u_int8_t*) + 2); 1289 } else { 1290 struct ppp_header *h; 1291 h = mtod (m, struct ppp_header*); 1292 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1293 h->control = PPP_UI; /* Unnumbered Info */ 1294 h->protocol = htons (proto); /* Link Control Protocol */ 1295 lh = (struct lcp_header*) (h + 1); 1296 } 1297 lh->type = type; 1298 lh->ident = ident; 1299 lh->len = htons (LCP_HEADER_LEN + len); 1300 if (len) 1301 bcopy (data, lh+1, len); 1302 1303 if (debug) { 1304 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 1305 SPP_ARGS(ifp), 1306 sppp_proto_name(proto), 1307 sppp_cp_type_name (lh->type), lh->ident, 1308 ntohs (lh->len)); 1309 if (len) 1310 sppp_print_bytes ((u_char*) (lh+1), len); 1311 addlog(">\n"); 1312 } 1313 if (IF_QFULL (&sp->pp_cpq)) { 1314 IF_DROP (&sp->pp_fastq); 1315 IF_DROP (&ifp->if_snd); 1316 m_freem (m); 1317 ++ifp->if_oerrors; 1318 } else 1319 IF_ENQUEUE (&sp->pp_cpq, m); 1320 if (! (ifp->if_flags & IFF_OACTIVE)) 1321 (*ifp->if_start) (ifp); 1322 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1323 } 1324 1325 /* 1326 * Handle incoming PPP control protocol packets. 1327 */ 1328 static void 1329 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1330 { 1331 STDDCL; 1332 struct lcp_header *h; 1333 int len = m->m_pkthdr.len; 1334 int rv; 1335 u_char *p; 1336 u_int32_t u32; 1337 1338 if (len < 4) { 1339 if (debug) 1340 log(LOG_DEBUG, 1341 SPP_FMT "%s invalid packet length: %d bytes\n", 1342 SPP_ARGS(ifp), cp->name, len); 1343 return; 1344 } 1345 h = mtod (m, struct lcp_header*); 1346 if (debug) { 1347 log(LOG_DEBUG, 1348 SPP_FMT "%s input(%s): <%s id=0x%x len=%d", 1349 SPP_ARGS(ifp), cp->name, 1350 sppp_state_name(sp->state[cp->protoidx]), 1351 sppp_cp_type_name (h->type), h->ident, ntohs (h->len)); 1352 if (len > 4) 1353 sppp_print_bytes ((u_char*) (h+1), len-4); 1354 addlog(">\n"); 1355 } 1356 if (len > ntohs (h->len)) 1357 len = ntohs (h->len); 1358 p = (u_char *)(h + 1); 1359 switch (h->type) { 1360 case CONF_REQ: 1361 if (len < 4) { 1362 if (debug) 1363 addlog(SPP_FMT "%s invalid conf-req length %d\n", 1364 SPP_ARGS(ifp), cp->name, 1365 len); 1366 ++ifp->if_ierrors; 1367 break; 1368 } 1369 /* handle states where RCR doesn't get a SCA/SCN */ 1370 switch (sp->state[cp->protoidx]) { 1371 case STATE_CLOSING: 1372 case STATE_STOPPING: 1373 return; 1374 case STATE_CLOSED: 1375 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1376 0, 0); 1377 return; 1378 } 1379 rv = (cp->RCR)(sp, h, len); 1380 switch (sp->state[cp->protoidx]) { 1381 case STATE_OPENED: 1382 (cp->tld)(sp); 1383 (cp->scr)(sp); 1384 /* fall through... */ 1385 case STATE_ACK_SENT: 1386 case STATE_REQ_SENT: 1387 sppp_cp_change_state(cp, sp, rv? 1388 STATE_ACK_SENT: STATE_REQ_SENT); 1389 break; 1390 case STATE_STOPPED: 1391 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1392 (cp->scr)(sp); 1393 sppp_cp_change_state(cp, sp, rv? 1394 STATE_ACK_SENT: STATE_REQ_SENT); 1395 break; 1396 case STATE_ACK_RCVD: 1397 if (rv) { 1398 sppp_cp_change_state(cp, sp, STATE_OPENED); 1399 if (debug) 1400 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1401 SPP_ARGS(ifp), 1402 cp->name); 1403 (cp->tlu)(sp); 1404 } else 1405 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1406 break; 1407 default: 1408 printf(SPP_FMT "%s illegal %s in state %s\n", 1409 SPP_ARGS(ifp), cp->name, 1410 sppp_cp_type_name(h->type), 1411 sppp_state_name(sp->state[cp->protoidx])); 1412 ++ifp->if_ierrors; 1413 } 1414 break; 1415 case CONF_ACK: 1416 if (h->ident != sp->confid[cp->protoidx]) { 1417 if (debug) 1418 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1419 SPP_ARGS(ifp), cp->name, 1420 h->ident, sp->confid[cp->protoidx]); 1421 ++ifp->if_ierrors; 1422 break; 1423 } 1424 switch (sp->state[cp->protoidx]) { 1425 case STATE_CLOSED: 1426 case STATE_STOPPED: 1427 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1428 break; 1429 case STATE_CLOSING: 1430 case STATE_STOPPING: 1431 break; 1432 case STATE_REQ_SENT: 1433 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1434 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1435 break; 1436 case STATE_OPENED: 1437 (cp->tld)(sp); 1438 /* fall through */ 1439 case STATE_ACK_RCVD: 1440 (cp->scr)(sp); 1441 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1442 break; 1443 case STATE_ACK_SENT: 1444 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1445 sppp_cp_change_state(cp, sp, STATE_OPENED); 1446 if (debug) 1447 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1448 SPP_ARGS(ifp), cp->name); 1449 (cp->tlu)(sp); 1450 break; 1451 default: 1452 printf(SPP_FMT "%s illegal %s in state %s\n", 1453 SPP_ARGS(ifp), cp->name, 1454 sppp_cp_type_name(h->type), 1455 sppp_state_name(sp->state[cp->protoidx])); 1456 ++ifp->if_ierrors; 1457 } 1458 break; 1459 case CONF_NAK: 1460 case CONF_REJ: 1461 if (h->ident != sp->confid[cp->protoidx]) { 1462 if (debug) 1463 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1464 SPP_ARGS(ifp), cp->name, 1465 h->ident, sp->confid[cp->protoidx]); 1466 ++ifp->if_ierrors; 1467 break; 1468 } 1469 if (h->type == CONF_NAK) 1470 (cp->RCN_nak)(sp, h, len); 1471 else /* CONF_REJ */ 1472 (cp->RCN_rej)(sp, h, len); 1473 1474 switch (sp->state[cp->protoidx]) { 1475 case STATE_CLOSED: 1476 case STATE_STOPPED: 1477 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1478 break; 1479 case STATE_REQ_SENT: 1480 case STATE_ACK_SENT: 1481 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1482 (cp->scr)(sp); 1483 break; 1484 case STATE_OPENED: 1485 (cp->tld)(sp); 1486 /* fall through */ 1487 case STATE_ACK_RCVD: 1488 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1489 (cp->scr)(sp); 1490 break; 1491 case STATE_CLOSING: 1492 case STATE_STOPPING: 1493 break; 1494 default: 1495 printf(SPP_FMT "%s illegal %s in state %s\n", 1496 SPP_ARGS(ifp), cp->name, 1497 sppp_cp_type_name(h->type), 1498 sppp_state_name(sp->state[cp->protoidx])); 1499 ++ifp->if_ierrors; 1500 } 1501 break; 1502 1503 case TERM_REQ: 1504 switch (sp->state[cp->protoidx]) { 1505 case STATE_ACK_RCVD: 1506 case STATE_ACK_SENT: 1507 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1508 /* fall through */ 1509 case STATE_CLOSED: 1510 case STATE_STOPPED: 1511 case STATE_CLOSING: 1512 case STATE_STOPPING: 1513 case STATE_REQ_SENT: 1514 sta: 1515 /* Send Terminate-Ack packet. */ 1516 if (debug) 1517 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n", 1518 SPP_ARGS(ifp), cp->name); 1519 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1520 break; 1521 case STATE_OPENED: 1522 (cp->tld)(sp); 1523 sp->rst_counter[cp->protoidx] = 0; 1524 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1525 goto sta; 1526 break; 1527 default: 1528 printf(SPP_FMT "%s illegal %s in state %s\n", 1529 SPP_ARGS(ifp), cp->name, 1530 sppp_cp_type_name(h->type), 1531 sppp_state_name(sp->state[cp->protoidx])); 1532 ++ifp->if_ierrors; 1533 } 1534 break; 1535 case TERM_ACK: 1536 switch (sp->state[cp->protoidx]) { 1537 case STATE_CLOSED: 1538 case STATE_STOPPED: 1539 case STATE_REQ_SENT: 1540 case STATE_ACK_SENT: 1541 break; 1542 case STATE_CLOSING: 1543 (cp->tlf)(sp); 1544 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1545 sppp_lcp_check_and_close(sp); 1546 break; 1547 case STATE_STOPPING: 1548 (cp->tlf)(sp); 1549 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1550 sppp_lcp_check_and_close(sp); 1551 break; 1552 case STATE_ACK_RCVD: 1553 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1554 break; 1555 case STATE_OPENED: 1556 (cp->tld)(sp); 1557 (cp->scr)(sp); 1558 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1559 break; 1560 default: 1561 printf(SPP_FMT "%s illegal %s in state %s\n", 1562 SPP_ARGS(ifp), cp->name, 1563 sppp_cp_type_name(h->type), 1564 sppp_state_name(sp->state[cp->protoidx])); 1565 ++ifp->if_ierrors; 1566 } 1567 break; 1568 case CODE_REJ: 1569 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1570 log(LOG_INFO, 1571 SPP_FMT "%s: ignoring RXJ (%s) for code ?, " 1572 "danger will robinson\n", 1573 SPP_ARGS(ifp), cp->name, 1574 sppp_cp_type_name(h->type)); 1575 switch (sp->state[cp->protoidx]) { 1576 case STATE_CLOSED: 1577 case STATE_STOPPED: 1578 case STATE_REQ_SENT: 1579 case STATE_ACK_SENT: 1580 case STATE_CLOSING: 1581 case STATE_STOPPING: 1582 case STATE_OPENED: 1583 break; 1584 case STATE_ACK_RCVD: 1585 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1586 break; 1587 default: 1588 printf(SPP_FMT "%s illegal %s in state %s\n", 1589 SPP_ARGS(ifp), cp->name, 1590 sppp_cp_type_name(h->type), 1591 sppp_state_name(sp->state[cp->protoidx])); 1592 ++ifp->if_ierrors; 1593 } 1594 break; 1595 case PROTO_REJ: 1596 { 1597 int catastrophic; 1598 const struct cp *upper; 1599 int i; 1600 u_int16_t proto; 1601 1602 catastrophic = 0; 1603 upper = NULL; 1604 proto = p[0] << 8 | p[1]; 1605 for (i = 0; i < IDX_COUNT; i++) { 1606 if (cps[i]->proto == proto) { 1607 upper = cps[i]; 1608 break; 1609 } 1610 } 1611 if (upper == NULL) 1612 catastrophic++; 1613 1614 log(LOG_INFO, 1615 SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1616 SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+', 1617 sppp_cp_type_name(h->type), proto, 1618 upper ? upper->name : "unknown", 1619 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1620 1621 /* 1622 * if we got RXJ+ against conf-req, the peer does not implement 1623 * this particular protocol type. terminate the protocol. 1624 */ 1625 if (upper && !catastrophic) { 1626 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1627 upper->Close(sp); 1628 break; 1629 } 1630 } 1631 1632 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1633 switch (sp->state[cp->protoidx]) { 1634 case STATE_CLOSED: 1635 case STATE_STOPPED: 1636 case STATE_REQ_SENT: 1637 case STATE_ACK_SENT: 1638 case STATE_CLOSING: 1639 case STATE_STOPPING: 1640 case STATE_OPENED: 1641 break; 1642 case STATE_ACK_RCVD: 1643 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1644 break; 1645 default: 1646 printf(SPP_FMT "%s illegal %s in state %s\n", 1647 SPP_ARGS(ifp), cp->name, 1648 sppp_cp_type_name(h->type), 1649 sppp_state_name(sp->state[cp->protoidx])); 1650 ++ifp->if_ierrors; 1651 } 1652 break; 1653 } 1654 case DISC_REQ: 1655 if (cp->proto != PPP_LCP) 1656 goto illegal; 1657 /* Discard the packet. */ 1658 break; 1659 case ECHO_REQ: 1660 if (cp->proto != PPP_LCP) 1661 goto illegal; 1662 if (sp->state[cp->protoidx] != STATE_OPENED) { 1663 if (debug) 1664 addlog(SPP_FMT "lcp echo req but lcp closed\n", 1665 SPP_ARGS(ifp)); 1666 ++ifp->if_ierrors; 1667 break; 1668 } 1669 if (len < 8) { 1670 if (debug) 1671 addlog(SPP_FMT "invalid lcp echo request " 1672 "packet length: %d bytes\n", 1673 SPP_ARGS(ifp), len); 1674 break; 1675 } 1676 memcpy(&u32, h + 1, sizeof u32); 1677 if (ntohl(u32) == sp->lcp.magic) { 1678 /* Line loopback mode detected. */ 1679 printf(SPP_FMT "loopback\n", SPP_ARGS(ifp)); 1680 if_down (ifp); 1681 IF_PURGE (&sp->pp_cpq); 1682 1683 /* Shut down the PPP link. */ 1684 /* XXX */ 1685 lcp.Down(sp); 1686 lcp.Up(sp); 1687 break; 1688 } 1689 u32 = htonl(sp->lcp.magic); 1690 memcpy(h + 1, &u32, sizeof u32); 1691 if (debug) 1692 addlog(SPP_FMT "got lcp echo req, sending echo rep\n", 1693 SPP_ARGS(ifp)); 1694 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1); 1695 break; 1696 case ECHO_REPLY: 1697 if (cp->proto != PPP_LCP) 1698 goto illegal; 1699 if (h->ident != sp->lcp.echoid) { 1700 ++ifp->if_ierrors; 1701 break; 1702 } 1703 if (len < 8) { 1704 if (debug) 1705 addlog(SPP_FMT "lcp invalid echo reply " 1706 "packet length: %d bytes\n", 1707 SPP_ARGS(ifp), len); 1708 break; 1709 } 1710 if (debug) 1711 addlog(SPP_FMT "lcp got echo rep\n", 1712 SPP_ARGS(ifp)); 1713 memcpy(&u32, h + 1, sizeof u32); 1714 if (ntohl(u32) != sp->lcp.magic) 1715 sp->pp_alivecnt = 0; 1716 break; 1717 default: 1718 /* Unknown packet type -- send Code-Reject packet. */ 1719 illegal: 1720 if (debug) 1721 addlog(SPP_FMT "%s send code-rej for 0x%x\n", 1722 SPP_ARGS(ifp), cp->name, h->type); 1723 sppp_cp_send(sp, cp->proto, CODE_REJ, 1724 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1725 ++ifp->if_ierrors; 1726 } 1727 } 1728 1729 1730 /* 1731 * The generic part of all Up/Down/Open/Close/TO event handlers. 1732 * Basically, the state transition handling in the automaton. 1733 */ 1734 static void 1735 sppp_up_event(const struct cp *cp, struct sppp *sp) 1736 { 1737 STDDCL; 1738 1739 if (debug) 1740 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n", 1741 SPP_ARGS(ifp), cp->name, 1742 sppp_state_name(sp->state[cp->protoidx])); 1743 1744 switch (sp->state[cp->protoidx]) { 1745 case STATE_INITIAL: 1746 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1747 break; 1748 case STATE_STARTING: 1749 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1750 (cp->scr)(sp); 1751 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1752 break; 1753 default: 1754 printf(SPP_FMT "%s illegal up in state %s\n", 1755 SPP_ARGS(ifp), cp->name, 1756 sppp_state_name(sp->state[cp->protoidx])); 1757 } 1758 } 1759 1760 static void 1761 sppp_down_event(const struct cp *cp, struct sppp *sp) 1762 { 1763 STDDCL; 1764 1765 if (debug) 1766 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n", 1767 SPP_ARGS(ifp), cp->name, 1768 sppp_state_name(sp->state[cp->protoidx])); 1769 1770 switch (sp->state[cp->protoidx]) { 1771 case STATE_CLOSED: 1772 case STATE_CLOSING: 1773 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1774 break; 1775 case STATE_STOPPED: 1776 (cp->tls)(sp); 1777 /* fall through */ 1778 case STATE_STOPPING: 1779 case STATE_REQ_SENT: 1780 case STATE_ACK_RCVD: 1781 case STATE_ACK_SENT: 1782 sppp_cp_change_state(cp, sp, STATE_STARTING); 1783 break; 1784 case STATE_OPENED: 1785 (cp->tld)(sp); 1786 sppp_cp_change_state(cp, sp, STATE_STARTING); 1787 break; 1788 default: 1789 printf(SPP_FMT "%s illegal down in state %s\n", 1790 SPP_ARGS(ifp), cp->name, 1791 sppp_state_name(sp->state[cp->protoidx])); 1792 } 1793 } 1794 1795 1796 static void 1797 sppp_open_event(const struct cp *cp, struct sppp *sp) 1798 { 1799 STDDCL; 1800 1801 if (debug) 1802 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n", 1803 SPP_ARGS(ifp), cp->name, 1804 sppp_state_name(sp->state[cp->protoidx])); 1805 1806 switch (sp->state[cp->protoidx]) { 1807 case STATE_INITIAL: 1808 (cp->tls)(sp); 1809 sppp_cp_change_state(cp, sp, STATE_STARTING); 1810 break; 1811 case STATE_STARTING: 1812 break; 1813 case STATE_CLOSED: 1814 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1815 (cp->scr)(sp); 1816 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1817 break; 1818 case STATE_STOPPED: 1819 case STATE_STOPPING: 1820 case STATE_REQ_SENT: 1821 case STATE_ACK_RCVD: 1822 case STATE_ACK_SENT: 1823 case STATE_OPENED: 1824 break; 1825 case STATE_CLOSING: 1826 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1827 break; 1828 } 1829 } 1830 1831 1832 static void 1833 sppp_close_event(const struct cp *cp, struct sppp *sp) 1834 { 1835 STDDCL; 1836 1837 if (debug) 1838 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n", 1839 SPP_ARGS(ifp), cp->name, 1840 sppp_state_name(sp->state[cp->protoidx])); 1841 1842 switch (sp->state[cp->protoidx]) { 1843 case STATE_INITIAL: 1844 case STATE_CLOSED: 1845 case STATE_CLOSING: 1846 break; 1847 case STATE_STARTING: 1848 (cp->tlf)(sp); 1849 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1850 break; 1851 case STATE_STOPPED: 1852 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1853 break; 1854 case STATE_STOPPING: 1855 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1856 break; 1857 case STATE_OPENED: 1858 (cp->tld)(sp); 1859 /* fall through */ 1860 case STATE_REQ_SENT: 1861 case STATE_ACK_RCVD: 1862 case STATE_ACK_SENT: 1863 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1864 sppp_cp_send(sp, cp->proto, TERM_REQ, 1865 ++sp->pp_seq[cp->protoidx], 0, 0); 1866 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1867 break; 1868 } 1869 } 1870 1871 static void 1872 sppp_to_event(const struct cp *cp, struct sppp *sp) 1873 { 1874 STDDCL; 1875 int s; 1876 1877 s = splnet(); 1878 if (debug) 1879 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n", 1880 SPP_ARGS(ifp), cp->name, 1881 sppp_state_name(sp->state[cp->protoidx]), 1882 sp->rst_counter[cp->protoidx]); 1883 1884 if (--sp->rst_counter[cp->protoidx] < 0) 1885 /* TO- event */ 1886 switch (sp->state[cp->protoidx]) { 1887 case STATE_CLOSING: 1888 (cp->tlf)(sp); 1889 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1890 sppp_lcp_check_and_close(sp); 1891 break; 1892 case STATE_STOPPING: 1893 (cp->tlf)(sp); 1894 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1895 sppp_lcp_check_and_close(sp); 1896 break; 1897 case STATE_REQ_SENT: 1898 case STATE_ACK_RCVD: 1899 case STATE_ACK_SENT: 1900 (cp->tlf)(sp); 1901 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1902 sppp_lcp_check_and_close(sp); 1903 break; 1904 } 1905 else 1906 /* TO+ event */ 1907 switch (sp->state[cp->protoidx]) { 1908 case STATE_CLOSING: 1909 case STATE_STOPPING: 1910 sppp_cp_send(sp, cp->proto, TERM_REQ, 1911 ++sp->pp_seq[cp->protoidx], 0, 0); 1912 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1913 cp->TO, sp); 1914 break; 1915 case STATE_REQ_SENT: 1916 case STATE_ACK_RCVD: 1917 (cp->scr)(sp); 1918 /* sppp_cp_change_state() will restart the timer */ 1919 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1920 break; 1921 case STATE_ACK_SENT: 1922 (cp->scr)(sp); 1923 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1924 cp->TO, sp); 1925 break; 1926 } 1927 1928 splx(s); 1929 } 1930 1931 /* 1932 * Change the state of a control protocol in the state automaton. 1933 * Takes care of starting/stopping the restart timer. 1934 */ 1935 void 1936 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1937 { 1938 sp->state[cp->protoidx] = newstate; 1939 callout_stop(&sp->ch[cp->protoidx]); 1940 switch (newstate) { 1941 case STATE_INITIAL: 1942 case STATE_STARTING: 1943 case STATE_CLOSED: 1944 case STATE_STOPPED: 1945 case STATE_OPENED: 1946 break; 1947 case STATE_CLOSING: 1948 case STATE_STOPPING: 1949 case STATE_REQ_SENT: 1950 case STATE_ACK_RCVD: 1951 case STATE_ACK_SENT: 1952 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1953 cp->TO, sp); 1954 break; 1955 } 1956 } 1957 /* 1959 *--------------------------------------------------------------------------* 1960 * * 1961 * The LCP implementation. * 1962 * * 1963 *--------------------------------------------------------------------------* 1964 */ 1965 static void 1966 sppp_lcp_init(struct sppp *sp) 1967 { 1968 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1969 sp->lcp.magic = 0; 1970 sp->state[IDX_LCP] = STATE_INITIAL; 1971 sp->fail_counter[IDX_LCP] = 0; 1972 sp->pp_seq[IDX_LCP] = 0; 1973 sp->pp_rseq[IDX_LCP] = 0; 1974 sp->lcp.protos = 0; 1975 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 1976 1977 /* 1978 * Initialize counters and timeout values. Note that we don't 1979 * use the 3 seconds suggested in RFC 1661 since we are likely 1980 * running on a fast link. XXX We should probably implement 1981 * the exponential backoff option. Note that these values are 1982 * relevant for all control protocols, not just LCP only. 1983 */ 1984 sp->lcp.timeout = 1 * hz; 1985 sp->lcp.max_terminate = 2; 1986 sp->lcp.max_configure = 10; 1987 sp->lcp.max_failure = 10; 1988 callout_init(&sp->ch[IDX_LCP]); 1989 } 1990 1991 static void 1992 sppp_lcp_up(struct sppp *sp) 1993 { 1994 STDDCL; 1995 1996 /* 1997 * If this interface is passive or dial-on-demand, and we are 1998 * still in Initial state, it means we've got an incoming 1999 * call. Activate the interface. 2000 */ 2001 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2002 if (debug) 2003 log(LOG_DEBUG, 2004 SPP_FMT "Up event", SPP_ARGS(ifp)); 2005 ifp->if_flags |= IFF_RUNNING; 2006 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2007 if (debug) 2008 addlog("(incoming call)\n"); 2009 sp->pp_flags |= PP_CALLIN; 2010 lcp.Open(sp); 2011 } else if (debug) 2012 addlog("\n"); 2013 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2014 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2015 ifp->if_flags |= IFF_RUNNING; 2016 lcp.Open(sp); 2017 } 2018 2019 sppp_up_event(&lcp, sp); 2020 } 2021 2022 static void 2023 sppp_lcp_down(struct sppp *sp) 2024 { 2025 STDDCL; 2026 2027 sppp_down_event(&lcp, sp); 2028 2029 /* 2030 * If this is neither a dial-on-demand nor a passive 2031 * interface, simulate an ``ifconfig down'' action, so the 2032 * administrator can force a redial by another ``ifconfig 2033 * up''. XXX For leased line operation, should we immediately 2034 * try to reopen the connection here? 2035 */ 2036 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2037 log(LOG_INFO, 2038 SPP_FMT "Down event (carrier loss), taking interface down.\n", 2039 SPP_ARGS(ifp)); 2040 if_down(ifp); 2041 } else { 2042 if (debug) 2043 log(LOG_DEBUG, 2044 SPP_FMT "Down event (carrier loss)\n", 2045 SPP_ARGS(ifp)); 2046 } 2047 sp->pp_flags &= ~PP_CALLIN; 2048 if (sp->state[IDX_LCP] != STATE_INITIAL) 2049 lcp.Close(sp); 2050 ifp->if_flags &= ~IFF_RUNNING; 2051 } 2052 2053 static void 2054 sppp_lcp_open(struct sppp *sp) 2055 { 2056 /* 2057 * If we are authenticator, negotiate LCP_AUTH 2058 */ 2059 if (sp->hisauth.proto != 0) 2060 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2061 else 2062 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2063 sp->pp_flags &= ~PP_NEEDAUTH; 2064 sppp_open_event(&lcp, sp); 2065 } 2066 2067 static void 2068 sppp_lcp_close(struct sppp *sp) 2069 { 2070 sppp_close_event(&lcp, sp); 2071 } 2072 2073 static void 2074 sppp_lcp_TO(void *cookie) 2075 { 2076 sppp_to_event(&lcp, (struct sppp *)cookie); 2077 } 2078 2079 /* 2080 * Analyze a configure request. Return true if it was agreeable, and 2081 * caused action sca, false if it has been rejected or nak'ed, and 2082 * caused action scn. (The return value is used to make the state 2083 * transition decision in the state automaton.) 2084 */ 2085 static int 2086 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2087 { 2088 STDDCL; 2089 u_char *buf, *r, *p; 2090 int origlen, rlen; 2091 u_int32_t nmagic; 2092 u_short authproto; 2093 2094 len -= 4; 2095 origlen = len; 2096 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2097 if (! buf) 2098 return (0); 2099 2100 if (debug) 2101 log(LOG_DEBUG, SPP_FMT "lcp parse opts:", 2102 SPP_ARGS(ifp)); 2103 2104 /* pass 1: check for things that need to be rejected */ 2105 p = (void*) (h+1); 2106 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2107 if (debug) 2108 addlog(" %s", sppp_lcp_opt_name(*p)); 2109 switch (*p) { 2110 case LCP_OPT_MAGIC: 2111 /* Magic number. */ 2112 /* fall through, both are same length */ 2113 case LCP_OPT_ASYNC_MAP: 2114 /* Async control character map. */ 2115 if (len >= 6 || p[1] == 6) 2116 continue; 2117 if (debug) 2118 addlog(" [invalid]"); 2119 break; 2120 case LCP_OPT_MRU: 2121 /* Maximum receive unit. */ 2122 if (len >= 4 && p[1] == 4) 2123 continue; 2124 if (debug) 2125 addlog(" [invalid]"); 2126 break; 2127 case LCP_OPT_AUTH_PROTO: 2128 if (len < 4) { 2129 if (debug) 2130 addlog(" [invalid]"); 2131 break; 2132 } 2133 authproto = (p[2] << 8) + p[3]; 2134 if (authproto == PPP_CHAP && p[1] != 5) { 2135 if (debug) 2136 addlog(" [invalid chap len]"); 2137 break; 2138 } 2139 if (sp->myauth.proto == 0) { 2140 /* we are not configured to do auth */ 2141 if (debug) 2142 addlog(" [not configured]"); 2143 break; 2144 } 2145 /* 2146 * Remote want us to authenticate, remember this, 2147 * so we stay in PHASE_AUTHENTICATE after LCP got 2148 * up. 2149 */ 2150 sp->pp_flags |= PP_NEEDAUTH; 2151 continue; 2152 default: 2153 /* Others not supported. */ 2154 if (debug) 2155 addlog(" [rej]"); 2156 break; 2157 } 2158 /* Add the option to rejected list. */ 2159 bcopy (p, r, p[1]); 2160 r += p[1]; 2161 rlen += p[1]; 2162 } 2163 if (rlen) { 2164 if (debug) 2165 addlog(" send conf-rej\n"); 2166 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2167 goto end; 2168 } else if (debug) 2169 addlog("\n"); 2170 2171 /* 2172 * pass 2: check for option values that are unacceptable and 2173 * thus require to be nak'ed. 2174 */ 2175 if (debug) 2176 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ", 2177 SPP_ARGS(ifp)); 2178 2179 p = (void*) (h+1); 2180 len = origlen; 2181 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2182 if (debug) 2183 addlog(" %s", sppp_lcp_opt_name(*p)); 2184 switch (*p) { 2185 case LCP_OPT_MAGIC: 2186 /* Magic number -- extract. */ 2187 nmagic = (u_int32_t)p[2] << 24 | 2188 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2189 if (nmagic != sp->lcp.magic) { 2190 if (debug) 2191 addlog(" 0x%x", nmagic); 2192 continue; 2193 } 2194 /* 2195 * Local and remote magics equal -- loopback? 2196 */ 2197 if (sp->pp_loopcnt >= MAXALIVECNT*5) { 2198 printf (SPP_FMT "loopback\n", 2199 SPP_ARGS(ifp)); 2200 sp->pp_loopcnt = 0; 2201 if (ifp->if_flags & IFF_UP) { 2202 if_down(ifp); 2203 IF_PURGE(&sp->pp_cpq); 2204 /* XXX ? */ 2205 lcp.Down(sp); 2206 lcp.Up(sp); 2207 } 2208 } else if (debug) 2209 addlog(" [glitch]"); 2210 ++sp->pp_loopcnt; 2211 /* 2212 * We negate our magic here, and NAK it. If 2213 * we see it later in an NAK packet, we 2214 * suggest a new one. 2215 */ 2216 nmagic = ~sp->lcp.magic; 2217 /* Gonna NAK it. */ 2218 p[2] = nmagic >> 24; 2219 p[3] = nmagic >> 16; 2220 p[4] = nmagic >> 8; 2221 p[5] = nmagic; 2222 break; 2223 2224 case LCP_OPT_ASYNC_MAP: 2225 /* Async control character map -- check to be zero. */ 2226 if (! p[2] && ! p[3] && ! p[4] && ! p[5]) { 2227 if (debug) 2228 addlog(" [empty]"); 2229 continue; 2230 } 2231 if (debug) 2232 addlog(" [non-empty]"); 2233 /* suggest a zero one */ 2234 p[2] = p[3] = p[4] = p[5] = 0; 2235 break; 2236 2237 case LCP_OPT_MRU: 2238 /* 2239 * Maximum receive unit. Always agreeable, 2240 * but ignored by now. 2241 */ 2242 sp->lcp.their_mru = p[2] * 256 + p[3]; 2243 if (debug) 2244 addlog(" %ld", sp->lcp.their_mru); 2245 continue; 2246 2247 case LCP_OPT_AUTH_PROTO: 2248 authproto = (p[2] << 8) + p[3]; 2249 if (sp->myauth.proto != authproto) { 2250 /* not agreed, nak */ 2251 if (debug) 2252 addlog(" [mine %s != his %s]", 2253 sppp_proto_name(sp->hisauth.proto), 2254 sppp_proto_name(authproto)); 2255 p[2] = sp->myauth.proto >> 8; 2256 p[3] = sp->myauth.proto; 2257 break; 2258 } 2259 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2260 if (debug) 2261 addlog(" [chap not MD5]"); 2262 p[4] = CHAP_MD5; 2263 break; 2264 } 2265 continue; 2266 } 2267 /* Add the option to nak'ed list. */ 2268 bcopy (p, r, p[1]); 2269 r += p[1]; 2270 rlen += p[1]; 2271 } 2272 if (rlen) { 2273 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2274 if (debug) 2275 addlog(" max_failure (%d) exceeded, " 2276 "send conf-rej\n", 2277 sp->lcp.max_failure); 2278 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2279 } else { 2280 if (debug) 2281 addlog(" send conf-nak\n"); 2282 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2283 } 2284 goto end; 2285 } else { 2286 if (debug) 2287 addlog(" send conf-ack\n"); 2288 sp->fail_counter[IDX_LCP] = 0; 2289 sp->pp_loopcnt = 0; 2290 sppp_cp_send (sp, PPP_LCP, CONF_ACK, 2291 h->ident, origlen, h+1); 2292 } 2293 2294 end: 2295 free (buf, M_TEMP); 2296 return (rlen == 0); 2297 } 2298 2299 /* 2300 * Analyze the LCP Configure-Reject option list, and adjust our 2301 * negotiation. 2302 */ 2303 static void 2304 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2305 { 2306 STDDCL; 2307 u_char *buf, *p; 2308 2309 len -= 4; 2310 buf = malloc (len, M_TEMP, M_NOWAIT); 2311 if (!buf) 2312 return; 2313 2314 if (debug) 2315 log(LOG_DEBUG, SPP_FMT "lcp rej opts:", 2316 SPP_ARGS(ifp)); 2317 2318 p = (void*) (h+1); 2319 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2320 if (debug) 2321 addlog(" %s", sppp_lcp_opt_name(*p)); 2322 switch (*p) { 2323 case LCP_OPT_MAGIC: 2324 /* Magic number -- can't use it, use 0 */ 2325 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2326 sp->lcp.magic = 0; 2327 break; 2328 case LCP_OPT_MRU: 2329 /* 2330 * Should not be rejected anyway, since we only 2331 * negotiate a MRU if explicitly requested by 2332 * peer. 2333 */ 2334 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2335 break; 2336 case LCP_OPT_AUTH_PROTO: 2337 /* 2338 * Peer doesn't want to authenticate himself, 2339 * deny unless this is a dialout call, and 2340 * AUTHFLAG_NOCALLOUT is set. 2341 */ 2342 if ((sp->pp_flags & PP_CALLIN) == 0 && 2343 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) { 2344 if (debug) 2345 addlog(" [don't insist on auth " 2346 "for callout]"); 2347 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2348 break; 2349 } 2350 if (debug) 2351 addlog("[access denied]\n"); 2352 lcp.Close(sp); 2353 break; 2354 } 2355 } 2356 if (debug) 2357 addlog("\n"); 2358 free (buf, M_TEMP); 2359 return; 2360 } 2361 2362 /* 2363 * Analyze the LCP Configure-NAK option list, and adjust our 2364 * negotiation. 2365 */ 2366 static void 2367 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2368 { 2369 STDDCL; 2370 u_char *buf, *p; 2371 u_int32_t magic; 2372 2373 len -= 4; 2374 buf = malloc (len, M_TEMP, M_NOWAIT); 2375 if (!buf) 2376 return; 2377 2378 if (debug) 2379 log(LOG_DEBUG, SPP_FMT "lcp nak opts:", 2380 SPP_ARGS(ifp)); 2381 2382 p = (void*) (h+1); 2383 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2384 if (debug) 2385 addlog(" %s", sppp_lcp_opt_name(*p)); 2386 switch (*p) { 2387 case LCP_OPT_MAGIC: 2388 /* Magic number -- renegotiate */ 2389 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2390 len >= 6 && p[1] == 6) { 2391 magic = (u_int32_t)p[2] << 24 | 2392 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2393 /* 2394 * If the remote magic is our negated one, 2395 * this looks like a loopback problem. 2396 * Suggest a new magic to make sure. 2397 */ 2398 if (magic == ~sp->lcp.magic) { 2399 if (debug) 2400 addlog(" magic glitch"); 2401 sp->lcp.magic = random(); 2402 } else { 2403 sp->lcp.magic = magic; 2404 if (debug) 2405 addlog(" %d", magic); 2406 } 2407 } 2408 break; 2409 case LCP_OPT_MRU: 2410 /* 2411 * Peer wants to advise us to negotiate an MRU. 2412 * Agree on it if it's reasonable, or use 2413 * default otherwise. 2414 */ 2415 if (len >= 4 && p[1] == 4) { 2416 u_int mru = p[2] * 256 + p[3]; 2417 if (debug) 2418 addlog(" %d", mru); 2419 if (mru < PP_MTU || mru > PP_MAX_MRU) 2420 mru = PP_MTU; 2421 sp->lcp.mru = mru; 2422 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2423 } 2424 break; 2425 case LCP_OPT_AUTH_PROTO: 2426 /* 2427 * Peer doesn't like our authentication method, 2428 * deny. 2429 */ 2430 if (debug) 2431 addlog("[access denied]\n"); 2432 lcp.Close(sp); 2433 break; 2434 } 2435 } 2436 if (debug) 2437 addlog("\n"); 2438 free (buf, M_TEMP); 2439 return; 2440 } 2441 2442 static void 2443 sppp_lcp_tlu(struct sppp *sp) 2444 { 2445 STDDCL; 2446 int i; 2447 u_int32_t mask; 2448 2449 /* XXX ? */ 2450 if (! (ifp->if_flags & IFF_UP) && 2451 (ifp->if_flags & IFF_RUNNING)) { 2452 /* Coming out of loopback mode. */ 2453 if_up(ifp); 2454 printf (SPP_FMT "up\n", SPP_ARGS(ifp)); 2455 } 2456 2457 for (i = 0; i < IDX_COUNT; i++) 2458 if ((cps[i])->flags & CP_QUAL) 2459 (cps[i])->Open(sp); 2460 2461 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2462 (sp->pp_flags & PP_NEEDAUTH) != 0) 2463 sp->pp_phase = PHASE_AUTHENTICATE; 2464 else 2465 sp->pp_phase = PHASE_NETWORK; 2466 2467 if(debug) 2468 { 2469 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2470 sppp_phase_name(sp->pp_phase)); 2471 } 2472 2473 /* 2474 * Open all authentication protocols. This is even required 2475 * if we already proceeded to network phase, since it might be 2476 * that remote wants us to authenticate, so we might have to 2477 * send a PAP request. Undesired authentication protocols 2478 * don't do anything when they get an Open event. 2479 */ 2480 for (i = 0; i < IDX_COUNT; i++) 2481 if ((cps[i])->flags & CP_AUTH) 2482 (cps[i])->Open(sp); 2483 2484 if (sp->pp_phase == PHASE_NETWORK) { 2485 /* Notify all NCPs. */ 2486 for (i = 0; i < IDX_COUNT; i++) 2487 if ((cps[i])->flags & CP_NCP) 2488 (cps[i])->Open(sp); 2489 } 2490 2491 /* Send Up events to all started protos. */ 2492 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2493 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2494 (cps[i])->Up(sp); 2495 2496 /* notify low-level driver of state change */ 2497 if (sp->pp_chg) 2498 sp->pp_chg(sp, (int)sp->pp_phase); 2499 2500 if (sp->pp_phase == PHASE_NETWORK) 2501 /* if no NCP is starting, close down */ 2502 sppp_lcp_check_and_close(sp); 2503 } 2504 2505 static void 2506 sppp_lcp_tld(struct sppp *sp) 2507 { 2508 STDDCL; 2509 int i; 2510 u_int32_t mask; 2511 2512 sp->pp_phase = PHASE_TERMINATE; 2513 2514 if(debug) 2515 { 2516 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2517 sppp_phase_name(sp->pp_phase)); 2518 } 2519 2520 /* 2521 * Take upper layers down. We send the Down event first and 2522 * the Close second to prevent the upper layers from sending 2523 * ``a flurry of terminate-request packets'', as the RFC 2524 * describes it. 2525 */ 2526 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2527 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2528 (cps[i])->Down(sp); 2529 (cps[i])->Close(sp); 2530 } 2531 } 2532 2533 static void 2534 sppp_lcp_tls(struct sppp *sp) 2535 { 2536 STDDCL; 2537 2538 sp->pp_phase = PHASE_ESTABLISH; 2539 2540 if(debug) 2541 { 2542 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2543 sppp_phase_name(sp->pp_phase)); 2544 } 2545 2546 /* Notify lower layer if desired. */ 2547 if (sp->pp_tls) 2548 (sp->pp_tls)(sp); 2549 } 2550 2551 static void 2552 sppp_lcp_tlf(struct sppp *sp) 2553 { 2554 STDDCL; 2555 2556 sp->pp_phase = PHASE_DEAD; 2557 2558 if(debug) 2559 { 2560 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2561 sppp_phase_name(sp->pp_phase)); 2562 } 2563 2564 /* Notify lower layer if desired. */ 2565 if (sp->pp_tlf) 2566 (sp->pp_tlf)(sp); 2567 } 2568 2569 static void 2570 sppp_lcp_scr(struct sppp *sp) 2571 { 2572 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2573 int i = 0; 2574 u_short authproto; 2575 2576 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2577 if (! sp->lcp.magic) 2578 sp->lcp.magic = random(); 2579 opt[i++] = LCP_OPT_MAGIC; 2580 opt[i++] = 6; 2581 opt[i++] = sp->lcp.magic >> 24; 2582 opt[i++] = sp->lcp.magic >> 16; 2583 opt[i++] = sp->lcp.magic >> 8; 2584 opt[i++] = sp->lcp.magic; 2585 } 2586 2587 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2588 opt[i++] = LCP_OPT_MRU; 2589 opt[i++] = 4; 2590 opt[i++] = sp->lcp.mru >> 8; 2591 opt[i++] = sp->lcp.mru; 2592 } 2593 2594 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2595 authproto = sp->hisauth.proto; 2596 opt[i++] = LCP_OPT_AUTH_PROTO; 2597 opt[i++] = authproto == PPP_CHAP? 5: 4; 2598 opt[i++] = authproto >> 8; 2599 opt[i++] = authproto; 2600 if (authproto == PPP_CHAP) 2601 opt[i++] = CHAP_MD5; 2602 } 2603 2604 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2605 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2606 } 2607 2608 /* 2609 * Check the open NCPs, return true if at least one NCP is open. 2610 */ 2611 static int 2612 sppp_ncp_check(struct sppp *sp) 2613 { 2614 int i, mask; 2615 2616 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2617 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2618 return 1; 2619 return 0; 2620 } 2621 2622 /* 2623 * Re-check the open NCPs and see if we should terminate the link. 2624 * Called by the NCPs during their tlf action handling. 2625 */ 2626 static void 2627 sppp_lcp_check_and_close(struct sppp *sp) 2628 { 2629 2630 if (sp->pp_phase < PHASE_NETWORK) 2631 /* don't bother, we are already going down */ 2632 return; 2633 2634 if (sppp_ncp_check(sp)) 2635 return; 2636 2637 lcp.Close(sp); 2638 } 2639 2640 2641 /* 2643 *--------------------------------------------------------------------------* 2644 * * 2645 * The IPCP implementation. * 2646 * * 2647 *--------------------------------------------------------------------------* 2648 */ 2649 2650 static void 2651 sppp_ipcp_init(struct sppp *sp) 2652 { 2653 sp->ipcp.opts = 0; 2654 sp->ipcp.flags = 0; 2655 sp->state[IDX_IPCP] = STATE_INITIAL; 2656 sp->fail_counter[IDX_IPCP] = 0; 2657 sp->pp_seq[IDX_IPCP] = 0; 2658 sp->pp_rseq[IDX_IPCP] = 0; 2659 callout_init(&sp->ch[IDX_IPCP]); 2660 } 2661 2662 static void 2663 sppp_ipcp_up(struct sppp *sp) 2664 { 2665 sppp_up_event(&ipcp, sp); 2666 } 2667 2668 static void 2669 sppp_ipcp_down(struct sppp *sp) 2670 { 2671 sppp_down_event(&ipcp, sp); 2672 } 2673 2674 static void 2675 sppp_ipcp_open(struct sppp *sp) 2676 { 2677 STDDCL; 2678 u_int32_t myaddr, hisaddr; 2679 2680 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2681 sp->ipcp.req_myaddr = 0; 2682 sp->ipcp.req_hisaddr = 0; 2683 2684 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2685 /* 2686 * If we don't have his address, this probably means our 2687 * interface doesn't want to talk IP at all. (This could 2688 * be the case if somebody wants to speak only IPX, for 2689 * example.) Don't open IPCP in this case. 2690 */ 2691 if (hisaddr == 0L) { 2692 /* XXX this message should go away */ 2693 if (debug) 2694 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n", 2695 SPP_ARGS(ifp)); 2696 return; 2697 } 2698 2699 if (myaddr == 0) { 2700 /* 2701 * I don't have an assigned address, so i need to 2702 * negotiate my address. 2703 */ 2704 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2705 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2706 } 2707 if (hisaddr == 1) { 2708 /* 2709 * XXX - remove this hack! 2710 * remote has no valid adress, we need to get one assigned. 2711 */ 2712 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2713 } 2714 sppp_open_event(&ipcp, sp); 2715 } 2716 2717 static void 2718 sppp_ipcp_close(struct sppp *sp) 2719 { 2720 sppp_close_event(&ipcp, sp); 2721 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2722 /* 2723 * Some address was dynamic, clear it again. 2724 */ 2725 sppp_clear_ip_addrs(sp); 2726 } 2727 2728 static void 2729 sppp_ipcp_TO(void *cookie) 2730 { 2731 sppp_to_event(&ipcp, (struct sppp *)cookie); 2732 } 2733 2734 /* 2735 * Analyze a configure request. Return true if it was agreeable, and 2736 * caused action sca, false if it has been rejected or nak'ed, and 2737 * caused action scn. (The return value is used to make the state 2738 * transition decision in the state automaton.) 2739 */ 2740 static int 2741 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2742 { 2743 u_char *buf, *r, *p; 2744 struct ifnet *ifp = &sp->pp_if; 2745 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2746 u_int32_t hisaddr, desiredaddr; 2747 2748 len -= 4; 2749 origlen = len; 2750 /* 2751 * Make sure to allocate a buf that can at least hold a 2752 * conf-nak with an `address' option. We might need it below. 2753 */ 2754 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2755 if (! buf) 2756 return (0); 2757 2758 /* pass 1: see if we can recognize them */ 2759 if (debug) 2760 log(LOG_DEBUG, SPP_FMT "ipcp parse opts:", 2761 SPP_ARGS(ifp)); 2762 p = (void*) (h+1); 2763 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2764 if (debug) 2765 addlog(" %s", sppp_ipcp_opt_name(*p)); 2766 switch (*p) { 2767 #ifdef notyet 2768 case IPCP_OPT_COMPRESSION: 2769 if (len >= 6 && p[1] >= 6) { 2770 /* correctly formed compress option */ 2771 continue; 2772 } 2773 if (debug) 2774 addlog(" [invalid]"); 2775 break; 2776 #endif 2777 case IPCP_OPT_ADDRESS: 2778 if (len >= 6 && p[1] == 6) { 2779 /* correctly formed address option */ 2780 continue; 2781 } 2782 if (debug) 2783 addlog(" [invalid]"); 2784 break; 2785 default: 2786 /* Others not supported. */ 2787 if (debug) 2788 addlog(" [rej]"); 2789 break; 2790 } 2791 /* Add the option to rejected list. */ 2792 bcopy (p, r, p[1]); 2793 r += p[1]; 2794 rlen += p[1]; 2795 } 2796 if (rlen) { 2797 if (debug) 2798 addlog(" send conf-rej\n"); 2799 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2800 goto end; 2801 } else if (debug) 2802 addlog("\n"); 2803 2804 /* pass 2: parse option values */ 2805 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2806 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2807 else 2808 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2809 if (debug) 2810 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ", 2811 SPP_ARGS(ifp)); 2812 p = (void*) (h+1); 2813 len = origlen; 2814 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2815 if (debug) 2816 addlog(" %s", sppp_ipcp_opt_name(*p)); 2817 switch (*p) { 2818 #ifdef notyet 2819 case IPCP_OPT_COMPRESSION: 2820 continue; 2821 #endif 2822 case IPCP_OPT_ADDRESS: 2823 desiredaddr = p[2] << 24 | p[3] << 16 | 2824 p[4] << 8 | p[5]; 2825 if (desiredaddr == hisaddr || 2826 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2827 /* 2828 * Peer's address is same as our value, 2829 * this is agreeable. Gonna conf-ack 2830 * it. 2831 */ 2832 if (debug) 2833 addlog(" %s [ack]", 2834 sppp_dotted_quad(hisaddr)); 2835 /* record that we've seen it already */ 2836 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2837 sp->ipcp.req_hisaddr = desiredaddr; 2838 hisaddr = desiredaddr; 2839 continue; 2840 } 2841 /* 2842 * The address wasn't agreeable. This is either 2843 * he sent us 0.0.0.0, asking to assign him an 2844 * address, or he send us another address not 2845 * matching our value. Either case, we gonna 2846 * conf-nak it with our value. 2847 */ 2848 if (debug) { 2849 if (desiredaddr == 0) 2850 addlog(" [addr requested]"); 2851 else 2852 addlog(" %s [not agreed]", 2853 sppp_dotted_quad(desiredaddr)); 2854 } 2855 2856 p[2] = hisaddr >> 24; 2857 p[3] = hisaddr >> 16; 2858 p[4] = hisaddr >> 8; 2859 p[5] = hisaddr; 2860 break; 2861 } 2862 /* Add the option to nak'ed list. */ 2863 bcopy (p, r, p[1]); 2864 r += p[1]; 2865 rlen += p[1]; 2866 } 2867 2868 /* 2869 * If we are about to conf-ack the request, but haven't seen 2870 * his address so far, gonna conf-nak it instead, with the 2871 * `address' option present and our idea of his address being 2872 * filled in there, to request negotiation of both addresses. 2873 * 2874 * XXX This can result in an endless req - nak loop if peer 2875 * doesn't want to send us his address. Q: What should we do 2876 * about it? XXX A: implement the max-failure counter. 2877 */ 2878 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2879 buf[0] = IPCP_OPT_ADDRESS; 2880 buf[1] = 6; 2881 buf[2] = hisaddr >> 24; 2882 buf[3] = hisaddr >> 16; 2883 buf[4] = hisaddr >> 8; 2884 buf[5] = hisaddr; 2885 rlen = 6; 2886 if (debug) 2887 addlog(" still need hisaddr"); 2888 } 2889 2890 if (rlen) { 2891 if (debug) 2892 addlog(" send conf-nak\n"); 2893 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2894 } else { 2895 if (debug) 2896 addlog(" send conf-ack\n"); 2897 sppp_cp_send (sp, PPP_IPCP, CONF_ACK, 2898 h->ident, origlen, h+1); 2899 } 2900 2901 end: 2902 free (buf, M_TEMP); 2903 return (rlen == 0); 2904 } 2905 2906 /* 2907 * Analyze the IPCP Configure-Reject option list, and adjust our 2908 * negotiation. 2909 */ 2910 static void 2911 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2912 { 2913 u_char *buf, *p; 2914 struct ifnet *ifp = &sp->pp_if; 2915 int debug = ifp->if_flags & IFF_DEBUG; 2916 2917 len -= 4; 2918 buf = malloc (len, M_TEMP, M_NOWAIT); 2919 if (!buf) 2920 return; 2921 2922 if (debug) 2923 log(LOG_DEBUG, SPP_FMT "ipcp rej opts:", 2924 SPP_ARGS(ifp)); 2925 2926 p = (void*) (h+1); 2927 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2928 if (debug) 2929 addlog(" %s", sppp_ipcp_opt_name(*p)); 2930 switch (*p) { 2931 case IPCP_OPT_ADDRESS: 2932 /* 2933 * Peer doesn't grok address option. This is 2934 * bad. XXX Should we better give up here? 2935 */ 2936 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 2937 break; 2938 #ifdef notyet 2939 case IPCP_OPT_COMPRESS: 2940 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 2941 break; 2942 #endif 2943 } 2944 } 2945 if (debug) 2946 addlog("\n"); 2947 free (buf, M_TEMP); 2948 return; 2949 } 2950 2951 /* 2952 * Analyze the IPCP Configure-NAK option list, and adjust our 2953 * negotiation. 2954 */ 2955 static void 2956 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2957 { 2958 u_char *buf, *p; 2959 struct ifnet *ifp = &sp->pp_if; 2960 int debug = ifp->if_flags & IFF_DEBUG; 2961 u_int32_t wantaddr; 2962 2963 len -= 4; 2964 buf = malloc (len, M_TEMP, M_NOWAIT); 2965 if (!buf) 2966 return; 2967 2968 if (debug) 2969 log(LOG_DEBUG, SPP_FMT "ipcp nak opts:", 2970 SPP_ARGS(ifp)); 2971 2972 p = (void*) (h+1); 2973 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2974 if (debug) 2975 addlog(" %s", sppp_ipcp_opt_name(*p)); 2976 switch (*p) { 2977 case IPCP_OPT_ADDRESS: 2978 /* 2979 * Peer doesn't like our local IP address. See 2980 * if we can do something for him. We'll drop 2981 * him our address then. 2982 */ 2983 if (len >= 6 && p[1] == 6) { 2984 wantaddr = p[2] << 24 | p[3] << 16 | 2985 p[4] << 8 | p[5]; 2986 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2987 if (debug) 2988 addlog(" [wantaddr %s]", 2989 sppp_dotted_quad(wantaddr)); 2990 /* 2991 * When doing dynamic address assignment, 2992 * we accept his offer. Otherwise, we 2993 * ignore it and thus continue to negotiate 2994 * our already existing value. 2995 */ 2996 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 2997 if (debug) 2998 addlog(" [agree]"); 2999 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3000 sp->ipcp.req_myaddr = wantaddr; 3001 } 3002 } 3003 break; 3004 #ifdef notyet 3005 case IPCP_OPT_COMPRESS: 3006 /* 3007 * Peer wants different compression parameters. 3008 */ 3009 break; 3010 #endif 3011 } 3012 } 3013 if (debug) 3014 addlog("\n"); 3015 free (buf, M_TEMP); 3016 return; 3017 } 3018 3019 static void 3020 sppp_ipcp_tlu(struct sppp *sp) 3021 { 3022 /* we are up. Set addresses and notify anyone interested */ 3023 u_int32_t myaddr, hisaddr; 3024 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3025 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3026 myaddr = sp->ipcp.req_myaddr; 3027 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3028 hisaddr = sp->ipcp.req_hisaddr; 3029 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3030 if (sp->pp_con) 3031 sp->pp_con(sp); 3032 } 3033 3034 static void 3035 sppp_ipcp_tld(struct sppp *sp) 3036 { 3037 } 3038 3039 static void 3040 sppp_ipcp_tls(struct sppp *sp) 3041 { 3042 /* indicate to LCP that it must stay alive */ 3043 sp->lcp.protos |= (1 << IDX_IPCP); 3044 } 3045 3046 static void 3047 sppp_ipcp_tlf(struct sppp *sp) 3048 { 3049 /* we no longer need LCP */ 3050 sp->lcp.protos &= ~(1 << IDX_IPCP); 3051 } 3052 3053 static void 3054 sppp_ipcp_scr(struct sppp *sp) 3055 { 3056 char opt[6 /* compression */ + 6 /* address */]; 3057 u_int32_t ouraddr; 3058 int i = 0; 3059 3060 #ifdef notyet 3061 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3062 opt[i++] = IPCP_OPT_COMPRESSION; 3063 opt[i++] = 6; 3064 opt[i++] = 0; /* VJ header compression */ 3065 opt[i++] = 0x2d; /* VJ header compression */ 3066 opt[i++] = max_slot_id; 3067 opt[i++] = comp_slot_id; 3068 } 3069 #endif 3070 3071 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3072 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3073 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3074 else 3075 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3076 opt[i++] = IPCP_OPT_ADDRESS; 3077 opt[i++] = 6; 3078 opt[i++] = ouraddr >> 24; 3079 opt[i++] = ouraddr >> 16; 3080 opt[i++] = ouraddr >> 8; 3081 opt[i++] = ouraddr; 3082 } 3083 3084 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3085 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3086 } 3087 3088 3089 /* 3091 *--------------------------------------------------------------------------* 3092 * * 3093 * The IPv6CP implementation. * 3094 * * 3095 *--------------------------------------------------------------------------* 3096 */ 3097 3098 #ifdef INET6 3099 static void 3100 sppp_ipv6cp_init(struct sppp *sp) 3101 { 3102 sp->ipv6cp.opts = 0; 3103 sp->ipv6cp.flags = 0; 3104 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3105 sp->fail_counter[IDX_IPV6CP] = 0; 3106 sp->pp_seq[IDX_IPV6CP] = 0; 3107 sp->pp_rseq[IDX_IPV6CP] = 0; 3108 callout_init(&sp->ch[IDX_IPV6CP]); 3109 } 3110 3111 static void 3112 sppp_ipv6cp_up(struct sppp *sp) 3113 { 3114 sppp_up_event(&ipv6cp, sp); 3115 } 3116 3117 static void 3118 sppp_ipv6cp_down(struct sppp *sp) 3119 { 3120 sppp_down_event(&ipv6cp, sp); 3121 } 3122 3123 static void 3124 sppp_ipv6cp_open(struct sppp *sp) 3125 { 3126 STDDCL; 3127 struct in6_addr myaddr, hisaddr; 3128 3129 #ifdef IPV6CP_MYIFID_DYN 3130 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3131 #else 3132 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3133 #endif 3134 3135 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3136 /* 3137 * If we don't have our address, this probably means our 3138 * interface doesn't want to talk IPv6 at all. (This could 3139 * be the case if somebody wants to speak only IPX, for 3140 * example.) Don't open IPv6CP in this case. 3141 */ 3142 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3143 /* XXX this message should go away */ 3144 if (debug) 3145 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n", 3146 SPP_ARGS(ifp)); 3147 return; 3148 } 3149 3150 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3151 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3152 sppp_open_event(&ipv6cp, sp); 3153 } 3154 3155 static void 3156 sppp_ipv6cp_close(struct sppp *sp) 3157 { 3158 sppp_close_event(&ipv6cp, sp); 3159 } 3160 3161 static void 3162 sppp_ipv6cp_TO(void *cookie) 3163 { 3164 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3165 } 3166 3167 /* 3168 * Analyze a configure request. Return true if it was agreeable, and 3169 * caused action sca, false if it has been rejected or nak'ed, and 3170 * caused action scn. (The return value is used to make the state 3171 * transition decision in the state automaton.) 3172 */ 3173 static int 3174 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3175 { 3176 u_char *buf, *r, *p; 3177 struct ifnet *ifp = &sp->pp_if; 3178 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3179 struct in6_addr myaddr, desiredaddr, suggestaddr; 3180 int ifidcount; 3181 int type; 3182 int collision, nohisaddr; 3183 3184 len -= 4; 3185 origlen = len; 3186 /* 3187 * Make sure to allocate a buf that can at least hold a 3188 * conf-nak with an `address' option. We might need it below. 3189 */ 3190 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3191 if (! buf) 3192 return (0); 3193 3194 /* pass 1: see if we can recognize them */ 3195 if (debug) 3196 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:", 3197 SPP_ARGS(ifp)); 3198 p = (void*) (h+1); 3199 ifidcount = 0; 3200 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3201 if (debug) 3202 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3203 switch (*p) { 3204 case IPV6CP_OPT_IFID: 3205 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3206 /* correctly formed address option */ 3207 ifidcount++; 3208 continue; 3209 } 3210 if (debug) 3211 addlog(" [invalid]"); 3212 break; 3213 #ifdef notyet 3214 case IPV6CP_OPT_COMPRESSION: 3215 if (len >= 4 && p[1] >= 4) { 3216 /* correctly formed compress option */ 3217 continue; 3218 } 3219 if (debug) 3220 addlog(" [invalid]"); 3221 break; 3222 #endif 3223 default: 3224 /* Others not supported. */ 3225 if (debug) 3226 addlog(" [rej]"); 3227 break; 3228 } 3229 /* Add the option to rejected list. */ 3230 bcopy (p, r, p[1]); 3231 r += p[1]; 3232 rlen += p[1]; 3233 } 3234 if (rlen) { 3235 if (debug) 3236 addlog(" send conf-rej\n"); 3237 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3238 goto end; 3239 } else if (debug) 3240 addlog("\n"); 3241 3242 /* pass 2: parse option values */ 3243 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3244 if (debug) 3245 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ", 3246 SPP_ARGS(ifp)); 3247 p = (void*) (h+1); 3248 len = origlen; 3249 type = CONF_ACK; 3250 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3251 if (debug) 3252 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3253 switch (*p) { 3254 #ifdef notyet 3255 case IPV6CP_OPT_COMPRESSION: 3256 continue; 3257 #endif 3258 case IPV6CP_OPT_IFID: 3259 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3260 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3261 collision = (bcmp(&desiredaddr.s6_addr[8], 3262 &myaddr.s6_addr[8], 8) == 0); 3263 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3264 3265 desiredaddr.s6_addr16[0] = htons(0xfe80); 3266 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3267 3268 if (!collision && !nohisaddr) { 3269 /* no collision, hisaddr known - Conf-Ack */ 3270 type = CONF_ACK; 3271 3272 if (debug) { 3273 addlog(" %s [%s]", 3274 ip6_sprintf(&desiredaddr), 3275 sppp_cp_type_name(type)); 3276 } 3277 continue; 3278 } 3279 3280 memset(&suggestaddr, 0, sizeof(&suggestaddr)); 3281 if (collision && nohisaddr) { 3282 /* collision, hisaddr unknown - Conf-Rej */ 3283 type = CONF_REJ; 3284 memset(&p[2], 0, 8); 3285 } else { 3286 /* 3287 * - no collision, hisaddr unknown, or 3288 * - collision, hisaddr known 3289 * Conf-Nak, suggest hisaddr 3290 */ 3291 type = CONF_NAK; 3292 sppp_suggest_ip6_addr(sp, &suggestaddr); 3293 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3294 } 3295 if (debug) 3296 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3297 sppp_cp_type_name(type)); 3298 break; 3299 } 3300 /* Add the option to nak'ed list. */ 3301 bcopy (p, r, p[1]); 3302 r += p[1]; 3303 rlen += p[1]; 3304 } 3305 3306 if (rlen == 0 && type == CONF_ACK) { 3307 if (debug) 3308 addlog(" send %s\n", sppp_cp_type_name(type)); 3309 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1); 3310 } else { 3311 #ifdef DIAGNOSTIC 3312 if (type == CONF_ACK) 3313 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3314 #endif 3315 3316 if (debug) { 3317 addlog(" send %s suggest %s\n", 3318 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3319 } 3320 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3321 } 3322 3323 end: 3324 free (buf, M_TEMP); 3325 return (rlen == 0); 3326 } 3327 3328 /* 3329 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3330 * negotiation. 3331 */ 3332 static void 3333 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3334 { 3335 u_char *buf, *p; 3336 struct ifnet *ifp = &sp->pp_if; 3337 int debug = ifp->if_flags & IFF_DEBUG; 3338 3339 len -= 4; 3340 buf = malloc (len, M_TEMP, M_NOWAIT); 3341 if (!buf) 3342 return; 3343 3344 if (debug) 3345 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:", 3346 SPP_ARGS(ifp)); 3347 3348 p = (void*) (h+1); 3349 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3350 if (debug) 3351 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3352 switch (*p) { 3353 case IPV6CP_OPT_IFID: 3354 /* 3355 * Peer doesn't grok address option. This is 3356 * bad. XXX Should we better give up here? 3357 */ 3358 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3359 break; 3360 #ifdef notyet 3361 case IPV6CP_OPT_COMPRESS: 3362 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3363 break; 3364 #endif 3365 } 3366 } 3367 if (debug) 3368 addlog("\n"); 3369 free (buf, M_TEMP); 3370 return; 3371 } 3372 3373 /* 3374 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3375 * negotiation. 3376 */ 3377 static void 3378 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3379 { 3380 u_char *buf, *p; 3381 struct ifnet *ifp = &sp->pp_if; 3382 int debug = ifp->if_flags & IFF_DEBUG; 3383 struct in6_addr suggestaddr; 3384 3385 len -= 4; 3386 buf = malloc (len, M_TEMP, M_NOWAIT); 3387 if (!buf) 3388 return; 3389 3390 if (debug) 3391 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:", 3392 SPP_ARGS(ifp)); 3393 3394 p = (void*) (h+1); 3395 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3396 if (debug) 3397 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3398 switch (*p) { 3399 case IPV6CP_OPT_IFID: 3400 /* 3401 * Peer doesn't like our local ifid. See 3402 * if we can do something for him. We'll drop 3403 * him our address then. 3404 */ 3405 if (len < 10 || p[1] != 10) 3406 break; 3407 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3408 suggestaddr.s6_addr16[0] = htons(0xfe80); 3409 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3410 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3411 3412 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3413 if (debug) 3414 addlog(" [suggestaddr %s]", 3415 ip6_sprintf(&suggestaddr)); 3416 #ifdef IPV6CP_MYIFID_DYN 3417 /* 3418 * When doing dynamic address assignment, 3419 * we accept his offer. 3420 */ 3421 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3422 struct in6_addr lastsuggest; 3423 /* 3424 * If <suggested myaddr from peer> equals to 3425 * <hisaddr we have suggested last time>, 3426 * we have a collision. generate new random 3427 * ifid. 3428 */ 3429 sppp_suggest_ip6_addr(&lastsuggest); 3430 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3431 lastsuggest)) { 3432 if (debug) 3433 addlog(" [random]"); 3434 sppp_gen_ip6_addr(sp, &suggestaddr); 3435 } 3436 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3437 if (debug) 3438 addlog(" [agree]"); 3439 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3440 } 3441 #else 3442 /* 3443 * Since we do not do dynamic address assignment, 3444 * we ignore it and thus continue to negotiate 3445 * our already existing value. This can possibly 3446 * go into infinite request-reject loop. 3447 * 3448 * This is not likely because we normally use 3449 * ifid based on MAC-address. 3450 * If you have no ethernet card on the node, too bad. 3451 * XXX should we use fail_counter? 3452 */ 3453 #endif 3454 break; 3455 #ifdef notyet 3456 case IPV6CP_OPT_COMPRESS: 3457 /* 3458 * Peer wants different compression parameters. 3459 */ 3460 break; 3461 #endif 3462 } 3463 } 3464 if (debug) 3465 addlog("\n"); 3466 free (buf, M_TEMP); 3467 return; 3468 } 3469 3470 static void 3471 sppp_ipv6cp_tlu(struct sppp *sp) 3472 { 3473 /* we are up - notify isdn daemon */ 3474 if (sp->pp_con) 3475 sp->pp_con(sp); 3476 } 3477 3478 static void 3479 sppp_ipv6cp_tld(struct sppp *sp) 3480 { 3481 } 3482 3483 static void 3484 sppp_ipv6cp_tls(struct sppp *sp) 3485 { 3486 /* indicate to LCP that it must stay alive */ 3487 sp->lcp.protos |= (1 << IDX_IPV6CP); 3488 } 3489 3490 static void 3491 sppp_ipv6cp_tlf(struct sppp *sp) 3492 { 3493 /* we no longer need LCP */ 3494 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3495 } 3496 3497 static void 3498 sppp_ipv6cp_scr(struct sppp *sp) 3499 { 3500 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3501 struct in6_addr ouraddr; 3502 int i = 0; 3503 3504 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3505 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3506 opt[i++] = IPV6CP_OPT_IFID; 3507 opt[i++] = 10; 3508 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3509 i += 8; 3510 } 3511 3512 #ifdef notyet 3513 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3514 opt[i++] = IPV6CP_OPT_COMPRESSION; 3515 opt[i++] = 4; 3516 opt[i++] = 0; /* TBD */ 3517 opt[i++] = 0; /* TBD */ 3518 /* variable length data may follow */ 3519 } 3520 #endif 3521 3522 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3523 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3524 } 3525 #else /*INET6*/ 3526 static void sppp_ipv6cp_init(struct sppp *sp) 3527 { 3528 } 3529 3530 static void sppp_ipv6cp_up(struct sppp *sp) 3531 { 3532 } 3533 3534 static void sppp_ipv6cp_down(struct sppp *sp) 3535 { 3536 } 3537 3538 3539 static void sppp_ipv6cp_open(struct sppp *sp) 3540 { 3541 } 3542 3543 static void sppp_ipv6cp_close(struct sppp *sp) 3544 { 3545 } 3546 3547 static void sppp_ipv6cp_TO(void *sp) 3548 { 3549 } 3550 3551 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3552 { 3553 return 0; 3554 } 3555 3556 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3557 { 3558 } 3559 3560 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3561 { 3562 } 3563 3564 static void sppp_ipv6cp_tlu(struct sppp *sp) 3565 { 3566 } 3567 3568 static void sppp_ipv6cp_tld(struct sppp *sp) 3569 { 3570 } 3571 3572 static void sppp_ipv6cp_tls(struct sppp *sp) 3573 { 3574 } 3575 3576 static void sppp_ipv6cp_tlf(struct sppp *sp) 3577 { 3578 } 3579 3580 static void sppp_ipv6cp_scr(struct sppp *sp) 3581 { 3582 } 3583 #endif /*INET6*/ 3584 3585 3586 /* 3588 *--------------------------------------------------------------------------* 3589 * * 3590 * The CHAP implementation. * 3591 * * 3592 *--------------------------------------------------------------------------* 3593 */ 3594 3595 /* 3596 * The authentication protocols don't employ a full-fledged state machine as 3597 * the control protocols do, since they do have Open and Close events, but 3598 * not Up and Down, nor are they explicitly terminated. Also, use of the 3599 * authentication protocols may be different in both directions (this makes 3600 * sense, think of a machine that never accepts incoming calls but only 3601 * calls out, it doesn't require the called party to authenticate itself). 3602 * 3603 * Our state machine for the local authentication protocol (we are requesting 3604 * the peer to authenticate) looks like: 3605 * 3606 * RCA- 3607 * +--------------------------------------------+ 3608 * V scn,tld| 3609 * +--------+ Close +---------+ RCA+ 3610 * | |<----------------------------------| |------+ 3611 * +--->| Closed | TO* | Opened | sca | 3612 * | | |-----+ +-------| |<-----+ 3613 * | +--------+ irc | | +---------+ 3614 * | ^ | | ^ 3615 * | | | | | 3616 * | | | | | 3617 * | TO-| | | | 3618 * | |tld TO+ V | | 3619 * | | +------->+ | | 3620 * | | | | | | 3621 * | +--------+ V | | 3622 * | | |<----+<--------------------+ | 3623 * | | Req- | scr | 3624 * | | Sent | | 3625 * | | | | 3626 * | +--------+ | 3627 * | RCA- | | RCA+ | 3628 * +------+ +------------------------------------------+ 3629 * scn,tld sca,irc,ict,tlu 3630 * 3631 * 3632 * with: 3633 * 3634 * Open: LCP reached authentication phase 3635 * Close: LCP reached terminate phase 3636 * 3637 * RCA+: received reply (pap-req, chap-response), acceptable 3638 * RCN: received reply (pap-req, chap-response), not acceptable 3639 * TO+: timeout with restart counter >= 0 3640 * TO-: timeout with restart counter < 0 3641 * TO*: reschedule timeout for CHAP 3642 * 3643 * scr: send request packet (none for PAP, chap-challenge) 3644 * sca: send ack packet (pap-ack, chap-success) 3645 * scn: send nak packet (pap-nak, chap-failure) 3646 * ict: initialize re-challenge timer (CHAP only) 3647 * 3648 * tlu: this-layer-up, LCP reaches network phase 3649 * tld: this-layer-down, LCP enters terminate phase 3650 * 3651 * Note that in CHAP mode, after sending a new challenge, while the state 3652 * automaton falls back into Req-Sent state, it doesn't signal a tld 3653 * event to LCP, so LCP remains in network phase. Only after not getting 3654 * any response (or after getting an unacceptable response), CHAP closes, 3655 * causing LCP to enter terminate phase. 3656 * 3657 * With PAP, there is no initial request that can be sent. The peer is 3658 * expected to send one based on the successful negotiation of PAP as 3659 * the authentication protocol during the LCP option negotiation. 3660 * 3661 * Incoming authentication protocol requests (remote requests 3662 * authentication, we are peer) don't employ a state machine at all, 3663 * they are simply answered. Some peers [Ascend P50 firmware rev 3664 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3665 * still in authentication phase (thereby violating the standard that 3666 * demands that these NCP packets are to be discarded), so we keep 3667 * track of the peer demanding us to authenticate, and only proceed to 3668 * phase network once we've seen a positive acknowledge for the 3669 * authentication. 3670 */ 3671 3672 /* 3673 * Handle incoming CHAP packets. 3674 */ 3675 void 3676 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3677 { 3678 STDDCL; 3679 struct lcp_header *h; 3680 int len, x; 3681 u_char *value, *name, digest[AUTHKEYLEN], dsize; 3682 int value_len, name_len; 3683 MD5_CTX ctx; 3684 3685 len = m->m_pkthdr.len; 3686 if (len < 4) { 3687 if (debug) 3688 log(LOG_DEBUG, 3689 SPP_FMT "chap invalid packet length: %d bytes\n", 3690 SPP_ARGS(ifp), len); 3691 return; 3692 } 3693 h = mtod (m, struct lcp_header*); 3694 if (len > ntohs (h->len)) 3695 len = ntohs (h->len); 3696 3697 switch (h->type) { 3698 /* challenge, failure and success are his authproto */ 3699 case CHAP_CHALLENGE: 3700 value = 1 + (u_char*)(h+1); 3701 value_len = value[-1]; 3702 name = value + value_len; 3703 name_len = len - value_len - 5; 3704 if (name_len < 0) { 3705 if (debug) { 3706 log(LOG_DEBUG, 3707 SPP_FMT "chap corrupted challenge " 3708 "<%s id=0x%x len=%d", 3709 SPP_ARGS(ifp), 3710 sppp_auth_type_name(PPP_CHAP, h->type), 3711 h->ident, ntohs(h->len)); 3712 if (len > 4) 3713 sppp_print_bytes((u_char*) (h+1), len-4); 3714 addlog(">\n"); 3715 } 3716 break; 3717 } 3718 3719 if (debug) { 3720 log(LOG_DEBUG, 3721 SPP_FMT "chap input <%s id=0x%x len=%d name=", 3722 SPP_ARGS(ifp), 3723 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3724 ntohs(h->len)); 3725 sppp_print_string((char*) name, name_len); 3726 addlog(" value-size=%d value=", value_len); 3727 sppp_print_bytes(value, value_len); 3728 addlog(">\n"); 3729 } 3730 3731 /* Compute reply value. */ 3732 MD5Init(&ctx); 3733 MD5Update(&ctx, &h->ident, 1); 3734 MD5Update(&ctx, sp->myauth.secret, 3735 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN)); 3736 MD5Update(&ctx, value, value_len); 3737 MD5Final(digest, &ctx); 3738 dsize = sizeof digest; 3739 3740 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3741 sizeof dsize, (const char *)&dsize, 3742 sizeof digest, digest, 3743 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 3744 sp->myauth.name, 3745 0); 3746 break; 3747 3748 case CHAP_SUCCESS: 3749 if (debug) { 3750 log(LOG_DEBUG, SPP_FMT "chap success", 3751 SPP_ARGS(ifp)); 3752 if (len > 4) { 3753 addlog(": "); 3754 sppp_print_string((char*)(h + 1), len - 4); 3755 } 3756 addlog("\n"); 3757 } 3758 x = splnet(); 3759 sp->pp_flags &= ~PP_NEEDAUTH; 3760 if (sp->myauth.proto == PPP_CHAP && 3761 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3762 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3763 /* 3764 * We are authenticator for CHAP but didn't 3765 * complete yet. Leave it to tlu to proceed 3766 * to network phase. 3767 */ 3768 splx(x); 3769 break; 3770 } 3771 splx(x); 3772 sppp_phase_network(sp); 3773 break; 3774 3775 case CHAP_FAILURE: 3776 if (debug) { 3777 log(LOG_INFO, SPP_FMT "chap failure", 3778 SPP_ARGS(ifp)); 3779 if (len > 4) { 3780 addlog(": "); 3781 sppp_print_string((char*)(h + 1), len - 4); 3782 } 3783 addlog("\n"); 3784 } else 3785 log(LOG_INFO, SPP_FMT "chap failure\n", 3786 SPP_ARGS(ifp)); 3787 /* await LCP shutdown by authenticator */ 3788 break; 3789 3790 /* response is my authproto */ 3791 case CHAP_RESPONSE: 3792 value = 1 + (u_char*)(h+1); 3793 value_len = value[-1]; 3794 name = value + value_len; 3795 name_len = len - value_len - 5; 3796 if (name_len < 0) { 3797 if (debug) { 3798 log(LOG_DEBUG, 3799 SPP_FMT "chap corrupted response " 3800 "<%s id=0x%x len=%d", 3801 SPP_ARGS(ifp), 3802 sppp_auth_type_name(PPP_CHAP, h->type), 3803 h->ident, ntohs(h->len)); 3804 if (len > 4) 3805 sppp_print_bytes((u_char*)(h+1), len-4); 3806 addlog(">\n"); 3807 } 3808 break; 3809 } 3810 if (h->ident != sp->confid[IDX_CHAP]) { 3811 if (debug) 3812 log(LOG_DEBUG, 3813 SPP_FMT "chap dropping response for old ID " 3814 "(got %d, expected %d)\n", 3815 SPP_ARGS(ifp), 3816 h->ident, sp->confid[IDX_CHAP]); 3817 break; 3818 } 3819 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) 3820 || bcmp(name, sp->hisauth.name, name_len) != 0) { 3821 log(LOG_INFO, SPP_FMT "chap response, his name ", 3822 SPP_ARGS(ifp)); 3823 sppp_print_string(name, name_len); 3824 addlog(" != expected "); 3825 sppp_print_string(sp->hisauth.name, 3826 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)); 3827 addlog("\n"); 3828 } 3829 if (debug) { 3830 log(LOG_DEBUG, SPP_FMT "chap input(%s) " 3831 "<%s id=0x%x len=%d name=", 3832 SPP_ARGS(ifp), 3833 sppp_state_name(sp->state[IDX_CHAP]), 3834 sppp_auth_type_name(PPP_CHAP, h->type), 3835 h->ident, ntohs (h->len)); 3836 sppp_print_string((char*)name, name_len); 3837 addlog(" value-size=%d value=", value_len); 3838 sppp_print_bytes(value, value_len); 3839 addlog(">\n"); 3840 } 3841 if (value_len != AUTHKEYLEN) { 3842 if (debug) 3843 log(LOG_DEBUG, 3844 SPP_FMT "chap bad hash value length: " 3845 "%d bytes, should be %d\n", 3846 SPP_ARGS(ifp), value_len, 3847 AUTHKEYLEN); 3848 break; 3849 } 3850 3851 MD5Init(&ctx); 3852 MD5Update(&ctx, &h->ident, 1); 3853 MD5Update(&ctx, sp->hisauth.secret, 3854 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN)); 3855 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN); 3856 MD5Final(digest, &ctx); 3857 3858 #define FAILMSG "Failed..." 3859 #define SUCCMSG "Welcome!" 3860 3861 if (value_len != sizeof digest || 3862 bcmp(digest, value, value_len) != 0) { 3863 /* action scn, tld */ 3864 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 3865 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 3866 0); 3867 chap.tld(sp); 3868 break; 3869 } 3870 /* action sca, perhaps tlu */ 3871 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 3872 sp->state[IDX_CHAP] == STATE_OPENED) 3873 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 3874 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 3875 0); 3876 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 3877 sppp_cp_change_state(&chap, sp, STATE_OPENED); 3878 chap.tlu(sp); 3879 } 3880 break; 3881 3882 default: 3883 /* Unknown CHAP packet type -- ignore. */ 3884 if (debug) { 3885 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) " 3886 "<0x%x id=0x%xh len=%d", 3887 SPP_ARGS(ifp), 3888 sppp_state_name(sp->state[IDX_CHAP]), 3889 h->type, h->ident, ntohs(h->len)); 3890 if (len > 4) 3891 sppp_print_bytes((u_char*)(h+1), len-4); 3892 addlog(">\n"); 3893 } 3894 break; 3895 3896 } 3897 } 3898 3899 static void 3900 sppp_chap_init(struct sppp *sp) 3901 { 3902 /* Chap doesn't have STATE_INITIAL at all. */ 3903 sp->state[IDX_CHAP] = STATE_CLOSED; 3904 sp->fail_counter[IDX_CHAP] = 0; 3905 sp->pp_seq[IDX_CHAP] = 0; 3906 sp->pp_rseq[IDX_CHAP] = 0; 3907 callout_init(&sp->ch[IDX_CHAP]); 3908 } 3909 3910 static void 3911 sppp_chap_open(struct sppp *sp) 3912 { 3913 if (sp->myauth.proto == PPP_CHAP && 3914 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 3915 /* we are authenticator for CHAP, start it */ 3916 chap.scr(sp); 3917 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3918 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3919 } 3920 /* nothing to be done if we are peer, await a challenge */ 3921 } 3922 3923 static void 3924 sppp_chap_close(struct sppp *sp) 3925 { 3926 if (sp->state[IDX_CHAP] != STATE_CLOSED) 3927 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3928 } 3929 3930 static void 3931 sppp_chap_TO(void *cookie) 3932 { 3933 struct sppp *sp = (struct sppp *)cookie; 3934 STDDCL; 3935 int s; 3936 3937 s = splnet(); 3938 if (debug) 3939 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n", 3940 SPP_ARGS(ifp), 3941 sppp_state_name(sp->state[IDX_CHAP]), 3942 sp->rst_counter[IDX_CHAP]); 3943 3944 if (--sp->rst_counter[IDX_CHAP] < 0) 3945 /* TO- event */ 3946 switch (sp->state[IDX_CHAP]) { 3947 case STATE_REQ_SENT: 3948 chap.tld(sp); 3949 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3950 break; 3951 } 3952 else 3953 /* TO+ (or TO*) event */ 3954 switch (sp->state[IDX_CHAP]) { 3955 case STATE_OPENED: 3956 /* TO* event */ 3957 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3958 /* fall through */ 3959 case STATE_REQ_SENT: 3960 chap.scr(sp); 3961 /* sppp_cp_change_state() will restart the timer */ 3962 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3963 break; 3964 } 3965 3966 splx(s); 3967 } 3968 3969 static void 3970 sppp_chap_tlu(struct sppp *sp) 3971 { 3972 STDDCL; 3973 int i, x; 3974 3975 i = 0; 3976 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3977 3978 /* 3979 * Some broken CHAP implementations (Conware CoNet, firmware 3980 * 4.0.?) don't want to re-authenticate their CHAP once the 3981 * initial challenge-response exchange has taken place. 3982 * Provide for an option to avoid rechallenges. 3983 */ 3984 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) { 3985 /* 3986 * Compute the re-challenge timeout. This will yield 3987 * a number between 300 and 810 seconds. 3988 */ 3989 i = 300 + ((unsigned)(random() & 0xff00) >> 7); 3990 3991 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 3992 } 3993 3994 if (debug) { 3995 log(LOG_DEBUG, 3996 SPP_FMT "chap %s, ", 3997 SPP_ARGS(ifp), 3998 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu"); 3999 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) 4000 addlog("next re-challenge in %d seconds\n", i); 4001 else 4002 addlog("re-challenging supressed\n"); 4003 } 4004 4005 x = splnet(); 4006 /* indicate to LCP that we need to be closed down */ 4007 sp->lcp.protos |= (1 << IDX_CHAP); 4008 4009 if (sp->pp_flags & PP_NEEDAUTH) { 4010 /* 4011 * Remote is authenticator, but his auth proto didn't 4012 * complete yet. Defer the transition to network 4013 * phase. 4014 */ 4015 splx(x); 4016 return; 4017 } 4018 splx(x); 4019 4020 /* 4021 * If we are already in phase network, we are done here. This 4022 * is the case if this is a dummy tlu event after a re-challenge. 4023 */ 4024 if (sp->pp_phase != PHASE_NETWORK) 4025 sppp_phase_network(sp); 4026 } 4027 4028 static void 4029 sppp_chap_tld(struct sppp *sp) 4030 { 4031 STDDCL; 4032 4033 if (debug) 4034 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp)); 4035 callout_stop(&sp->ch[IDX_CHAP]); 4036 sp->lcp.protos &= ~(1 << IDX_CHAP); 4037 4038 lcp.Close(sp); 4039 } 4040 4041 static void 4042 sppp_chap_scr(struct sppp *sp) 4043 { 4044 struct timeval tv; 4045 u_int32_t *ch, seed; 4046 u_char clen; 4047 4048 /* Compute random challenge. */ 4049 ch = (u_int32_t *)sp->myauth.challenge; 4050 microtime(&tv); 4051 seed = tv.tv_sec ^ tv.tv_usec; 4052 ch[0] = seed ^ random(); 4053 ch[1] = seed ^ random(); 4054 ch[2] = seed ^ random(); 4055 ch[3] = seed ^ random(); 4056 clen = AUTHKEYLEN; 4057 4058 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4059 4060 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4061 sizeof clen, (const char *)&clen, 4062 (size_t)AUTHKEYLEN, sp->myauth.challenge, 4063 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 4064 sp->myauth.name, 4065 0); 4066 } 4067 /* 4069 *--------------------------------------------------------------------------* 4070 * * 4071 * The PAP implementation. * 4072 * * 4073 *--------------------------------------------------------------------------* 4074 */ 4075 /* 4076 * For PAP, we need to keep a little state also if we are the peer, not the 4077 * authenticator. This is since we don't get a request to authenticate, but 4078 * have to repeatedly authenticate ourself until we got a response (or the 4079 * retry counter is expired). 4080 */ 4081 4082 /* 4083 * Handle incoming PAP packets. */ 4084 static void 4085 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4086 { 4087 STDDCL; 4088 struct lcp_header *h; 4089 int len, x; 4090 u_char *name, *passwd, mlen; 4091 int name_len, passwd_len; 4092 4093 len = m->m_pkthdr.len; 4094 if (len < 5) { 4095 if (debug) 4096 log(LOG_DEBUG, 4097 SPP_FMT "pap invalid packet length: %d bytes\n", 4098 SPP_ARGS(ifp), len); 4099 return; 4100 } 4101 h = mtod (m, struct lcp_header*); 4102 if (len > ntohs (h->len)) 4103 len = ntohs (h->len); 4104 switch (h->type) { 4105 /* PAP request is my authproto */ 4106 case PAP_REQ: 4107 name = 1 + (u_char*)(h+1); 4108 name_len = name[-1]; 4109 passwd = name + name_len + 1; 4110 if (name_len > len - 6 || 4111 (passwd_len = passwd[-1]) > len - 6 - name_len) { 4112 if (debug) { 4113 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4114 "<%s id=0x%x len=%d", 4115 SPP_ARGS(ifp), 4116 sppp_auth_type_name(PPP_PAP, h->type), 4117 h->ident, ntohs(h->len)); 4118 if (len > 4) 4119 sppp_print_bytes((u_char*)(h+1), len-4); 4120 addlog(">\n"); 4121 } 4122 break; 4123 } 4124 if (debug) { 4125 log(LOG_DEBUG, SPP_FMT "pap input(%s) " 4126 "<%s id=0x%x len=%d name=", 4127 SPP_ARGS(ifp), 4128 sppp_state_name(sp->state[IDX_PAP]), 4129 sppp_auth_type_name(PPP_PAP, h->type), 4130 h->ident, ntohs(h->len)); 4131 sppp_print_string((char*)name, name_len); 4132 addlog(" passwd="); 4133 sppp_print_string((char*)passwd, passwd_len); 4134 addlog(">\n"); 4135 } 4136 if (name_len > AUTHNAMELEN || 4137 passwd_len > AUTHKEYLEN || 4138 bcmp(name, sp->hisauth.name, name_len) != 0 || 4139 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) { 4140 /* action scn, tld */ 4141 mlen = sizeof(FAILMSG) - 1; 4142 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4143 sizeof mlen, (const char *)&mlen, 4144 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4145 0); 4146 pap.tld(sp); 4147 break; 4148 } 4149 /* action sca, perhaps tlu */ 4150 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4151 sp->state[IDX_PAP] == STATE_OPENED) { 4152 mlen = sizeof(SUCCMSG) - 1; 4153 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4154 sizeof mlen, (const char *)&mlen, 4155 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4156 0); 4157 } 4158 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4159 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4160 pap.tlu(sp); 4161 } 4162 break; 4163 4164 /* ack and nak are his authproto */ 4165 case PAP_ACK: 4166 callout_stop(&sp->pap_my_to_ch); 4167 if (debug) { 4168 log(LOG_DEBUG, SPP_FMT "pap success", 4169 SPP_ARGS(ifp)); 4170 name_len = *(char *)h; 4171 if (len > 5 && name_len) { 4172 addlog(": "); 4173 sppp_print_string((char*)(h+1), name_len); 4174 } 4175 addlog("\n"); 4176 } 4177 x = splnet(); 4178 sp->pp_flags &= ~PP_NEEDAUTH; 4179 if (sp->myauth.proto == PPP_PAP && 4180 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4181 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4182 /* 4183 * We are authenticator for PAP but didn't 4184 * complete yet. Leave it to tlu to proceed 4185 * to network phase. 4186 */ 4187 splx(x); 4188 break; 4189 } 4190 splx(x); 4191 sppp_phase_network(sp); 4192 break; 4193 4194 case PAP_NAK: 4195 callout_stop(&sp->pap_my_to_ch); 4196 if (debug) { 4197 log(LOG_INFO, SPP_FMT "pap failure", 4198 SPP_ARGS(ifp)); 4199 name_len = *(char *)h; 4200 if (len > 5 && name_len) { 4201 addlog(": "); 4202 sppp_print_string((char*)(h+1), name_len); 4203 } 4204 addlog("\n"); 4205 } else 4206 log(LOG_INFO, SPP_FMT "pap failure\n", 4207 SPP_ARGS(ifp)); 4208 /* await LCP shutdown by authenticator */ 4209 break; 4210 4211 default: 4212 /* Unknown PAP packet type -- ignore. */ 4213 if (debug) { 4214 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4215 "<0x%x id=0x%x len=%d", 4216 SPP_ARGS(ifp), 4217 h->type, h->ident, ntohs(h->len)); 4218 if (len > 4) 4219 sppp_print_bytes((u_char*)(h+1), len-4); 4220 addlog(">\n"); 4221 } 4222 break; 4223 4224 } 4225 } 4226 4227 static void 4228 sppp_pap_init(struct sppp *sp) 4229 { 4230 /* PAP doesn't have STATE_INITIAL at all. */ 4231 sp->state[IDX_PAP] = STATE_CLOSED; 4232 sp->fail_counter[IDX_PAP] = 0; 4233 sp->pp_seq[IDX_PAP] = 0; 4234 sp->pp_rseq[IDX_PAP] = 0; 4235 callout_init(&sp->ch[IDX_PAP]); 4236 callout_init(&sp->pap_my_to_ch); 4237 } 4238 4239 static void 4240 sppp_pap_open(struct sppp *sp) 4241 { 4242 if (sp->hisauth.proto == PPP_PAP && 4243 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4244 /* we are authenticator for PAP, start our timer */ 4245 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4246 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4247 } 4248 if (sp->myauth.proto == PPP_PAP) { 4249 /* we are peer, send a request, and start a timer */ 4250 pap.scr(sp); 4251 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4252 sppp_pap_my_TO, sp); 4253 } 4254 } 4255 4256 static void 4257 sppp_pap_close(struct sppp *sp) 4258 { 4259 if (sp->state[IDX_PAP] != STATE_CLOSED) 4260 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4261 } 4262 4263 /* 4264 * That's the timeout routine if we are authenticator. Since the 4265 * authenticator is basically passive in PAP, we can't do much here. 4266 */ 4267 static void 4268 sppp_pap_TO(void *cookie) 4269 { 4270 struct sppp *sp = (struct sppp *)cookie; 4271 STDDCL; 4272 int s; 4273 4274 s = splnet(); 4275 if (debug) 4276 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n", 4277 SPP_ARGS(ifp), 4278 sppp_state_name(sp->state[IDX_PAP]), 4279 sp->rst_counter[IDX_PAP]); 4280 4281 if (--sp->rst_counter[IDX_PAP] < 0) 4282 /* TO- event */ 4283 switch (sp->state[IDX_PAP]) { 4284 case STATE_REQ_SENT: 4285 pap.tld(sp); 4286 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4287 break; 4288 } 4289 else 4290 /* TO+ event, not very much we could do */ 4291 switch (sp->state[IDX_PAP]) { 4292 case STATE_REQ_SENT: 4293 /* sppp_cp_change_state() will restart the timer */ 4294 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4295 break; 4296 } 4297 4298 splx(s); 4299 } 4300 4301 /* 4302 * That's the timeout handler if we are peer. Since the peer is active, 4303 * we need to retransmit our PAP request since it is apparently lost. 4304 * XXX We should impose a max counter. 4305 */ 4306 static void 4307 sppp_pap_my_TO(void *cookie) 4308 { 4309 struct sppp *sp = (struct sppp *)cookie; 4310 STDDCL; 4311 4312 if (debug) 4313 log(LOG_DEBUG, SPP_FMT "pap peer TO\n", 4314 SPP_ARGS(ifp)); 4315 4316 pap.scr(sp); 4317 } 4318 4319 static void 4320 sppp_pap_tlu(struct sppp *sp) 4321 { 4322 STDDCL; 4323 int x; 4324 4325 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4326 4327 if (debug) 4328 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 4329 SPP_ARGS(ifp), pap.name); 4330 4331 x = splnet(); 4332 /* indicate to LCP that we need to be closed down */ 4333 sp->lcp.protos |= (1 << IDX_PAP); 4334 4335 if (sp->pp_flags & PP_NEEDAUTH) { 4336 /* 4337 * Remote is authenticator, but his auth proto didn't 4338 * complete yet. Defer the transition to network 4339 * phase. 4340 */ 4341 splx(x); 4342 return; 4343 } 4344 splx(x); 4345 sppp_phase_network(sp); 4346 } 4347 4348 static void 4349 sppp_pap_tld(struct sppp *sp) 4350 { 4351 STDDCL; 4352 4353 if (debug) 4354 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp)); 4355 callout_stop(&sp->ch[IDX_PAP]); 4356 callout_stop(&sp->pap_my_to_ch); 4357 sp->lcp.protos &= ~(1 << IDX_PAP); 4358 4359 lcp.Close(sp); 4360 } 4361 4362 static void 4363 sppp_pap_scr(struct sppp *sp) 4364 { 4365 u_char idlen, pwdlen; 4366 4367 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4368 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN); 4369 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN); 4370 4371 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4372 sizeof idlen, (const char *)&idlen, 4373 (size_t)idlen, sp->myauth.name, 4374 sizeof pwdlen, (const char *)&pwdlen, 4375 (size_t)pwdlen, sp->myauth.secret, 4376 0); 4377 } 4378 /* 4380 * Random miscellaneous functions. 4381 */ 4382 4383 /* 4384 * Send a PAP or CHAP proto packet. 4385 * 4386 * Varadic function, each of the elements for the ellipsis is of type 4387 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4388 * mlen == 0. 4389 * NOTE: never declare variadic functions with types subject to type 4390 * promotion (i.e. u_char). This is asking for big trouble depending 4391 * on the architecture you are on... 4392 */ 4393 4394 static void 4395 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4396 unsigned int type, unsigned int id, 4397 ...) 4398 { 4399 STDDCL; 4400 struct lcp_header *lh; 4401 struct mbuf *m; 4402 u_char *p; 4403 int len; 4404 size_t pkthdrlen; 4405 unsigned int mlen; 4406 const char *msg; 4407 va_list ap; 4408 4409 MGETHDR (m, M_DONTWAIT, MT_DATA); 4410 if (! m) 4411 return; 4412 m->m_pkthdr.rcvif = 0; 4413 4414 if (sp->pp_flags & PP_NOFRAMING) { 4415 *mtod(m, u_int16_t*) = htons(cp->proto); 4416 pkthdrlen = 2; 4417 lh = (struct lcp_header*)(mtod(m, u_int8_t*)+2); 4418 } else { 4419 struct ppp_header *h; 4420 h = mtod (m, struct ppp_header*); 4421 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4422 h->control = PPP_UI; /* Unnumbered Info */ 4423 h->protocol = htons(cp->proto); 4424 pkthdrlen = PPP_HEADER_LEN; 4425 4426 lh = (struct lcp_header*)(h + 1); 4427 } 4428 4429 lh->type = type; 4430 lh->ident = id; 4431 p = (u_char*) (lh+1); 4432 4433 va_start(ap, id); 4434 len = 0; 4435 4436 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4437 msg = va_arg(ap, const char *); 4438 len += mlen; 4439 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4440 va_end(ap); 4441 m_freem(m); 4442 return; 4443 } 4444 4445 bcopy(msg, p, mlen); 4446 p += mlen; 4447 } 4448 va_end(ap); 4449 4450 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4451 lh->len = htons (LCP_HEADER_LEN + len); 4452 4453 if (debug) { 4454 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 4455 SPP_ARGS(ifp), cp->name, 4456 sppp_auth_type_name(cp->proto, lh->type), 4457 lh->ident, ntohs(lh->len)); 4458 if (len) 4459 sppp_print_bytes((u_char*) (lh+1), len); 4460 addlog(">\n"); 4461 } 4462 if (IF_QFULL (&sp->pp_cpq)) { 4463 IF_DROP (&sp->pp_fastq); 4464 IF_DROP (&ifp->if_snd); 4465 m_freem (m); 4466 ++ifp->if_oerrors; 4467 } else 4468 IF_ENQUEUE (&sp->pp_cpq, m); 4469 if (! (ifp->if_flags & IFF_OACTIVE)) 4470 (*ifp->if_start) (ifp); 4471 ifp->if_obytes += m->m_pkthdr.len + 3; 4472 } 4473 4474 /* 4475 * Send keepalive packets, every 10 seconds. 4476 */ 4477 static void 4478 sppp_keepalive(void *dummy) 4479 { 4480 struct sppp *sp; 4481 int s; 4482 4483 s = splnet(); 4484 for (sp=spppq; sp; sp=sp->pp_next) { 4485 struct ifnet *ifp = &sp->pp_if; 4486 4487 /* Keepalive mode disabled or channel down? */ 4488 if (! (sp->pp_flags & PP_KEEPALIVE) || 4489 ! (ifp->if_flags & IFF_RUNNING)) 4490 continue; 4491 4492 /* No keepalive in PPP mode if LCP not opened yet. */ 4493 if (! (sp->pp_flags & PP_CISCO) && 4494 sp->pp_phase < PHASE_AUTHENTICATE) 4495 continue; 4496 4497 if (sp->pp_alivecnt == MAXALIVECNT) { 4498 /* No keepalive packets got. Stop the interface. */ 4499 printf (SPP_FMT "down\n", SPP_ARGS(ifp)); 4500 if_down (ifp); 4501 IF_PURGE (&sp->pp_cpq); 4502 if (! (sp->pp_flags & PP_CISCO)) { 4503 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4504 ifp->if_xname); 4505 sp->pp_alivecnt = 0; 4506 4507 /* we are down, close all open protocols */ 4508 lcp.Close(sp); 4509 4510 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4511 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4512 4513 /* Close connection imediatly, completition of this 4514 * will summon the magic needed to reestablish it. */ 4515 sp->pp_tlf(sp); 4516 continue; 4517 } 4518 } 4519 if (sp->pp_alivecnt <= MAXALIVECNT) 4520 ++sp->pp_alivecnt; 4521 if (sp->pp_flags & PP_CISCO) 4522 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, 4523 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4524 else if (sp->pp_phase >= PHASE_AUTHENTICATE) { 4525 int32_t nmagic = htonl (sp->lcp.magic); 4526 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4527 sppp_cp_send (sp, PPP_LCP, ECHO_REQ, 4528 sp->lcp.echoid, 4, &nmagic); 4529 } 4530 } 4531 splx(s); 4532 callout_reset(&keepalive_ch, hz * 10, sppp_keepalive, NULL); 4533 } 4534 4535 /* 4536 * Get both IP addresses. 4537 */ 4538 static void 4539 sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, u_int32_t *srcmask) 4540 { 4541 struct ifnet *ifp = &sp->pp_if; 4542 struct ifaddr *ifa; 4543 struct sockaddr_in *si, *sm; 4544 u_int32_t ssrc, ddst; 4545 4546 sm = NULL; 4547 ssrc = ddst = 0; 4548 /* 4549 * Pick the first AF_INET address from the list, 4550 * aliases don't make any sense on a p2p link anyway. 4551 */ 4552 si = 0; 4553 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 4554 if (ifa->ifa_addr->sa_family == AF_INET) { 4555 si = (struct sockaddr_in *)ifa->ifa_addr; 4556 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4557 if (si) 4558 break; 4559 } 4560 } 4561 if (ifa) { 4562 if (si && si->sin_addr.s_addr) { 4563 ssrc = si->sin_addr.s_addr; 4564 if (srcmask) 4565 *srcmask = ntohl(sm->sin_addr.s_addr); 4566 } 4567 4568 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4569 if (si && si->sin_addr.s_addr) 4570 ddst = si->sin_addr.s_addr; 4571 } 4572 4573 if (dst) *dst = ntohl(ddst); 4574 if (src) *src = ntohl(ssrc); 4575 } 4576 4577 /* 4578 * Set IP addresses. Must be called at splnet. 4579 * If an address is 0, leave it the way it is. 4580 */ 4581 static void 4582 sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr) 4583 { 4584 STDDCL; 4585 struct ifaddr *ifa; 4586 struct sockaddr_in *si; 4587 struct sockaddr_in *dest; 4588 4589 /* 4590 * Pick the first AF_INET address from the list, 4591 * aliases don't make any sense on a p2p link anyway. 4592 */ 4593 4594 si = 0; 4595 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4596 { 4597 if (ifa->ifa_addr->sa_family == AF_INET) 4598 { 4599 si = (struct sockaddr_in *)ifa->ifa_addr; 4600 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4601 if (si) 4602 break; 4603 } 4604 } 4605 4606 if (ifa && si) 4607 { 4608 int error; 4609 struct sockaddr_in new_sin = *si; 4610 struct sockaddr_in new_dst = *dest; 4611 4612 /* 4613 * Scrub old routes now instead of calling in_ifinit with 4614 * scrub=1, because we may change the dstaddr 4615 * before the call to in_ifinit. 4616 */ 4617 in_ifscrub(ifp, ifatoia(ifa)); 4618 4619 if (myaddr != 0) 4620 new_sin.sin_addr.s_addr = htonl(myaddr); 4621 if (hisaddr != 0) { 4622 new_dst.sin_addr.s_addr = htonl(hisaddr); 4623 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4624 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4625 *dest = new_dst; /* fix dstaddr in place */ 4626 } 4627 } 4628 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4629 if(debug && error) 4630 { 4631 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addrs: in_ifinit " 4632 " failed, error=%d\n", SPP_ARGS(ifp), error); 4633 } 4634 } 4635 } 4636 4637 /* 4638 * Clear IP addresses. Must be called at splnet. 4639 */ 4640 static void 4641 sppp_clear_ip_addrs(struct sppp *sp) 4642 { 4643 struct ifnet *ifp = &sp->pp_if; 4644 struct ifaddr *ifa; 4645 struct sockaddr_in *si; 4646 struct sockaddr_in *dest; 4647 4648 u_int32_t remote; 4649 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4650 remote = sp->ipcp.saved_hisaddr; 4651 else 4652 sppp_get_ip_addrs(sp, 0, &remote, 0); 4653 4654 /* 4655 * Pick the first AF_INET address from the list, 4656 * aliases don't make any sense on a p2p link anyway. 4657 */ 4658 4659 si = 0; 4660 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4661 { 4662 if (ifa->ifa_addr->sa_family == AF_INET) 4663 { 4664 si = (struct sockaddr_in *)ifa->ifa_addr; 4665 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4666 if (si) 4667 break; 4668 } 4669 } 4670 4671 if (ifa && si) 4672 { 4673 struct sockaddr_in new_sin = *si; 4674 4675 in_ifscrub(ifp, ifatoia(ifa)); 4676 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4677 new_sin.sin_addr.s_addr = 0; 4678 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4679 /* replace peer addr in place */ 4680 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4681 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4682 } 4683 } 4684 4685 #ifdef INET6 4686 /* 4687 * Get both IPv6 addresses. 4688 */ 4689 static void 4690 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4691 struct in6_addr *srcmask) 4692 { 4693 struct ifnet *ifp = &sp->pp_if; 4694 struct ifaddr *ifa; 4695 struct sockaddr_in6 *si, *sm; 4696 struct in6_addr ssrc, ddst; 4697 4698 sm = NULL; 4699 memset(&ssrc, 0, sizeof(ssrc)); 4700 memset(&ddst, 0, sizeof(ddst)); 4701 /* 4702 * Pick the first link-local AF_INET6 address from the list, 4703 * aliases don't make any sense on a p2p link anyway. 4704 */ 4705 si = 0; 4706 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4707 if (ifa->ifa_addr->sa_family == AF_INET6) { 4708 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4709 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4710 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4711 break; 4712 } 4713 if (ifa) { 4714 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4715 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 4716 if (srcmask) { 4717 bcopy(&sm->sin6_addr, srcmask, 4718 sizeof(*srcmask)); 4719 } 4720 } 4721 4722 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4723 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4724 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 4725 } 4726 4727 if (dst) 4728 bcopy(&ddst, dst, sizeof(*dst)); 4729 if (src) 4730 bcopy(&ssrc, src, sizeof(*src)); 4731 } 4732 4733 #ifdef IPV6CP_MYIFID_DYN 4734 /* 4735 * Generate random ifid. 4736 */ 4737 static void 4738 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 4739 { 4740 /* TBD */ 4741 } 4742 4743 /* 4744 * Set my IPv6 address. Must be called at splnet. 4745 */ 4746 static void 4747 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 4748 { 4749 STDDCL; 4750 struct ifaddr *ifa; 4751 struct sockaddr_in6 *sin6; 4752 4753 /* 4754 * Pick the first link-local AF_INET6 address from the list, 4755 * aliases don't make any sense on a p2p link anyway. 4756 */ 4757 4758 sin6 = NULL; 4759 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4760 { 4761 if (ifa->ifa_addr->sa_family == AF_INET6) 4762 { 4763 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 4764 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 4765 break; 4766 } 4767 } 4768 4769 if (ifa && sin6) 4770 { 4771 int error; 4772 struct sockaddr_in6 new_sin6 = *sin6; 4773 4774 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 4775 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 4776 if (debug && error) 4777 { 4778 log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit " 4779 " failed, error=%d\n", SPP_ARGS(ifp), error); 4780 } 4781 } 4782 } 4783 #endif 4784 4785 /* 4786 * Suggest a candidate address to be used by peer. 4787 */ 4788 static void 4789 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 4790 { 4791 struct in6_addr myaddr; 4792 struct timeval tv; 4793 4794 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 4795 4796 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 4797 microtime(&tv); 4798 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 4799 myaddr.s6_addr[14] ^= 0xff; 4800 myaddr.s6_addr[15] ^= 0xff; 4801 } else { 4802 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 4803 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 4804 } 4805 if (suggest) 4806 bcopy(&myaddr, suggest, sizeof(myaddr)); 4807 } 4808 #endif /*INET6*/ 4809 4810 static int 4811 sppp_params(struct sppp *sp, int cmd, void *data) 4812 { 4813 struct ifreq *ifr = (struct ifreq *)data; 4814 struct spppreq spr; 4815 4816 #if 0 4817 /* 4818 * ifr->ifr_data is supposed to point to a struct spppreq. 4819 * Check the cmd word first before attempting to fetch all the 4820 * data. 4821 */ 4822 if ((subcmd = fuword(ifr->ifr_data)) == -1) 4823 return EFAULT; 4824 #endif 4825 4826 if (copyin((caddr_t)ifr->ifr_data, &spr, sizeof spr) != 0) 4827 return EFAULT; 4828 4829 switch (spr.cmd) { 4830 case SPPPIOGDEFS: 4831 if (cmd != (int)SIOCGIFGENERIC) 4832 return EINVAL; 4833 /* 4834 * We copy over the entire current state, but clean 4835 * out some of the stuff we don't wanna pass up. 4836 * Remember, SIOCGIFGENERIC is unprotected, and can be 4837 * called by any user. No need to ever get PAP or 4838 * CHAP secrets back to userland anyway. 4839 */ 4840 bcopy(sp, &spr.defs, sizeof(struct sppp)); 4841 memset(spr.defs.myauth.secret, 0, AUTHKEYLEN); 4842 memset(spr.defs.myauth.challenge, 0, AUTHKEYLEN); 4843 memset(spr.defs.hisauth.secret, 0, AUTHKEYLEN); 4844 memset(spr.defs.hisauth.challenge, 0, AUTHKEYLEN); 4845 return copyout(&spr, (caddr_t)ifr->ifr_data, sizeof spr); 4846 4847 case SPPPIOSDEFS: 4848 if (cmd != (int)SIOCSIFGENERIC) 4849 return EINVAL; 4850 /* 4851 * We have a very specific idea of which fields we allow 4852 * being passed back from userland, so to not clobber our 4853 * current state. For one, we only allow setting 4854 * anything if LCP is in dead phase. Once the LCP 4855 * negotiations started, the authentication settings must 4856 * not be changed again. (The administrator can force an 4857 * ifconfig down in order to get LCP back into dead 4858 * phase.) 4859 * 4860 * Also, we only allow for authentication parameters to be 4861 * specified. 4862 * 4863 * XXX Should allow to set or clear pp_flags. 4864 * 4865 * Finally, if the respective authentication protocol to 4866 * be used is set differently than 0, but the secret is 4867 * passed as all zeros, we don't trash the existing secret. 4868 * This allows an administrator to change the system name 4869 * only without clobbering the secret (which he didn't get 4870 * back in a previous SPPPIOGDEFS call). However, the 4871 * secrets are cleared if the authentication protocol is 4872 * reset to 0. 4873 */ 4874 if (sp->pp_phase != PHASE_DEAD) 4875 return EBUSY; 4876 4877 if ((spr.defs.myauth.proto != 0 && spr.defs.myauth.proto != PPP_PAP && 4878 spr.defs.myauth.proto != PPP_CHAP) || 4879 (spr.defs.hisauth.proto != 0 && spr.defs.hisauth.proto != PPP_PAP && 4880 spr.defs.hisauth.proto != PPP_CHAP)) 4881 return EINVAL; 4882 4883 if (spr.defs.myauth.proto == 0) 4884 /* resetting myauth */ 4885 memset(&sp->myauth, 0, sizeof sp->myauth); 4886 else { 4887 /* setting/changing myauth */ 4888 sp->myauth.proto = spr.defs.myauth.proto; 4889 bcopy(spr.defs.myauth.name, sp->myauth.name, AUTHNAMELEN); 4890 if (spr.defs.myauth.secret[0] != '\0') 4891 bcopy(spr.defs.myauth.secret, sp->myauth.secret, 4892 AUTHKEYLEN); 4893 } 4894 if (spr.defs.hisauth.proto == 0) 4895 /* resetting hisauth */ 4896 memset(&sp->hisauth, 0, sizeof sp->hisauth); 4897 else { 4898 /* setting/changing hisauth */ 4899 sp->hisauth.proto = spr.defs.hisauth.proto; 4900 sp->hisauth.flags = spr.defs.hisauth.flags; 4901 bcopy(spr.defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN); 4902 if (spr.defs.hisauth.secret[0] != '\0') 4903 bcopy(spr.defs.hisauth.secret, sp->hisauth.secret, 4904 AUTHKEYLEN); 4905 } 4906 break; 4907 4908 default: 4909 return EINVAL; 4910 } 4911 4912 return 0; 4913 } 4914 4915 static void 4916 sppp_phase_network(struct sppp *sp) 4917 { 4918 STDDCL; 4919 int i; 4920 u_int32_t mask; 4921 4922 sp->pp_phase = PHASE_NETWORK; 4923 4924 if(debug) 4925 { 4926 log(LOG_INFO, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 4927 sppp_phase_name(sp->pp_phase)); 4928 } 4929 4930 /* Notify NCPs now. */ 4931 for (i = 0; i < IDX_COUNT; i++) 4932 if ((cps[i])->flags & CP_NCP) 4933 (cps[i])->Open(sp); 4934 4935 /* Send Up events to all NCPs. */ 4936 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 4937 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 4938 (cps[i])->Up(sp); 4939 4940 /* if no NCP is starting, all this was in vain, close down */ 4941 sppp_lcp_check_and_close(sp); 4942 } 4943 4944 4945 static const char * 4946 sppp_cp_type_name(u_char type) 4947 { 4948 static char buf[12]; 4949 switch (type) { 4950 case CONF_REQ: return "conf-req"; 4951 case CONF_ACK: return "conf-ack"; 4952 case CONF_NAK: return "conf-nak"; 4953 case CONF_REJ: return "conf-rej"; 4954 case TERM_REQ: return "term-req"; 4955 case TERM_ACK: return "term-ack"; 4956 case CODE_REJ: return "code-rej"; 4957 case PROTO_REJ: return "proto-rej"; 4958 case ECHO_REQ: return "echo-req"; 4959 case ECHO_REPLY: return "echo-reply"; 4960 case DISC_REQ: return "discard-req"; 4961 } 4962 sprintf (buf, "0x%x", type); 4963 return buf; 4964 } 4965 4966 static const char * 4967 sppp_auth_type_name(u_short proto, u_char type) 4968 { 4969 static char buf[12]; 4970 switch (proto) { 4971 case PPP_CHAP: 4972 switch (type) { 4973 case CHAP_CHALLENGE: return "challenge"; 4974 case CHAP_RESPONSE: return "response"; 4975 case CHAP_SUCCESS: return "success"; 4976 case CHAP_FAILURE: return "failure"; 4977 } 4978 case PPP_PAP: 4979 switch (type) { 4980 case PAP_REQ: return "req"; 4981 case PAP_ACK: return "ack"; 4982 case PAP_NAK: return "nak"; 4983 } 4984 } 4985 sprintf (buf, "0x%x", type); 4986 return buf; 4987 } 4988 4989 static const char * 4990 sppp_lcp_opt_name(u_char opt) 4991 { 4992 static char buf[12]; 4993 switch (opt) { 4994 case LCP_OPT_MRU: return "mru"; 4995 case LCP_OPT_ASYNC_MAP: return "async-map"; 4996 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 4997 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 4998 case LCP_OPT_MAGIC: return "magic"; 4999 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5000 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5001 } 5002 sprintf (buf, "0x%x", opt); 5003 return buf; 5004 } 5005 5006 static const char * 5007 sppp_ipcp_opt_name(u_char opt) 5008 { 5009 static char buf[12]; 5010 switch (opt) { 5011 case IPCP_OPT_ADDRESSES: return "addresses"; 5012 case IPCP_OPT_COMPRESSION: return "compression"; 5013 case IPCP_OPT_ADDRESS: return "address"; 5014 } 5015 sprintf (buf, "0x%x", opt); 5016 return buf; 5017 } 5018 5019 #ifdef INET6 5020 static const char * 5021 sppp_ipv6cp_opt_name(u_char opt) 5022 { 5023 static char buf[12]; 5024 switch (opt) { 5025 case IPV6CP_OPT_IFID: return "ifid"; 5026 case IPV6CP_OPT_COMPRESSION: return "compression"; 5027 } 5028 sprintf (buf, "0x%x", opt); 5029 return buf; 5030 } 5031 #endif 5032 5033 static const char * 5034 sppp_state_name(int state) 5035 { 5036 switch (state) { 5037 case STATE_INITIAL: return "initial"; 5038 case STATE_STARTING: return "starting"; 5039 case STATE_CLOSED: return "closed"; 5040 case STATE_STOPPED: return "stopped"; 5041 case STATE_CLOSING: return "closing"; 5042 case STATE_STOPPING: return "stopping"; 5043 case STATE_REQ_SENT: return "req-sent"; 5044 case STATE_ACK_RCVD: return "ack-rcvd"; 5045 case STATE_ACK_SENT: return "ack-sent"; 5046 case STATE_OPENED: return "opened"; 5047 } 5048 return "illegal"; 5049 } 5050 5051 static const char * 5052 sppp_phase_name(enum ppp_phase phase) 5053 { 5054 switch (phase) { 5055 case PHASE_DEAD: return "dead"; 5056 case PHASE_ESTABLISH: return "establish"; 5057 case PHASE_TERMINATE: return "terminate"; 5058 case PHASE_AUTHENTICATE: return "authenticate"; 5059 case PHASE_NETWORK: return "network"; 5060 } 5061 return "illegal"; 5062 } 5063 5064 static const char * 5065 sppp_proto_name(u_short proto) 5066 { 5067 static char buf[12]; 5068 switch (proto) { 5069 case PPP_LCP: return "lcp"; 5070 case PPP_IPCP: return "ipcp"; 5071 case PPP_PAP: return "pap"; 5072 case PPP_CHAP: return "chap"; 5073 case PPP_IPV6CP: return "ipv6cp"; 5074 } 5075 sprintf(buf, "0x%x", (unsigned)proto); 5076 return buf; 5077 } 5078 5079 static void 5080 sppp_print_bytes(const u_char *p, u_short len) 5081 { 5082 addlog(" %02x", *p++); 5083 while (--len > 0) 5084 addlog("-%02x", *p++); 5085 } 5086 5087 static void 5088 sppp_print_string(const char *p, u_short len) 5089 { 5090 u_char c; 5091 5092 while (len-- > 0) { 5093 c = *p++; 5094 /* 5095 * Print only ASCII chars directly. RFC 1994 recommends 5096 * using only them, but we don't rely on it. */ 5097 if (c < ' ' || c > '~') 5098 addlog("\\x%x", c); 5099 else 5100 addlog("%c", c); 5101 } 5102 } 5103 5104 static const char * 5105 sppp_dotted_quad(u_int32_t addr) 5106 { 5107 static char s[16]; 5108 sprintf(s, "%d.%d.%d.%d", 5109 (int)((addr >> 24) & 0xff), 5110 (int)((addr >> 16) & 0xff), 5111 (int)((addr >> 8) & 0xff), 5112 (int)(addr & 0xff)); 5113 return s; 5114 } 5115 5116 static int 5117 sppp_strnlen(u_char *p, int max) 5118 { 5119 int len; 5120 5121 for (len = 0; len < max && *p; ++p) 5122 ++len; 5123 return len; 5124 } 5125 5126 /* a dummy, used to drop uninteresting events */ 5127 static void 5128 sppp_null(struct sppp *unused) 5129 { 5130 /* do just nothing */ 5131 } 5132 /* 5133 * This file is large. Tell emacs to highlight it nevertheless. 5134 * 5135 * Local Variables: 5136 * hilit-auto-highlight-maxout: 120000 5137 * End: 5138 */ 5139
Indexes created Fri Sep 26 20:09:58 GMT 2025