1 /* 2 * Synchronous PPP/Cisco link level subroutines. 3 * Keepalive protocol implemented in both Cisco and PPP modes. 4 * 5 * Copyright (C) 1994-1996 Cronyx Engineering Ltd. 6 * Author: Serge Vakulenko, <vak@cronyx.ru> 7 * 8 * Heavily revamped to conform to RFC 1661. 9 * Copyright (C) 1997, 2001 Joerg Wunsch. 10 * 11 * This software is distributed with NO WARRANTIES, not even the implied 12 * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 13 * 14 * Authors grant any other persons or organisations permission to use 15 * or modify this software as long as this message is kept with the software, 16 * all derivative works or modified versions. 17 * 18 * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997 19 * 20 * $FreeBSD: src/sys/net/if_spppsubr.c,v 1.59.2.13 2002/07/03 15:44:41 joerg Exp $ 21 * $DragonFly: src/sys/net/sppp/if_spppsubr.c,v 1.8 2004/01/06 03:17:27 dillon Exp $ 22 */ 23 24 #include <sys/param.h> 25 26 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 27 #include "opt_inet.h" 28 #include "opt_inet6.h" 29 #include "opt_ipx.h" 30 #endif 31 32 #ifdef NetBSD1_3 33 # if NetBSD1_3 > 6 34 # include "opt_inet.h" 35 # include "opt_inet6.h" 36 # include "opt_iso.h" 37 # endif 38 #endif 39 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/module.h> 43 #include <sys/sockio.h> 44 #include <sys/socket.h> 45 #include <sys/syslog.h> 46 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 47 #include <sys/random.h> 48 #endif 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 52 #if defined (__OpenBSD__) 53 #include <sys/md5k.h> 54 #else 55 #include <sys/md5.h> 56 #endif 57 58 #include <net/if.h> 59 #include <net/netisr.h> 60 #include <net/if_types.h> 61 #include <net/route.h> 62 #include <netinet/in.h> 63 #include <netinet/in_systm.h> 64 #include <netinet/ip.h> 65 #include <net/slcompress.h> 66 67 #if defined (__NetBSD__) || defined (__OpenBSD__) 68 #include <machine/cpu.h> /* XXX for softnet */ 69 #endif 70 71 #include <machine/stdarg.h> 72 73 #include <netinet/in.h> 74 #include <netinet/in_systm.h> 75 #include <netinet/in_var.h> 76 77 #ifdef INET 78 #include <netinet/ip.h> 79 #include <netinet/tcp.h> 80 #endif 81 82 #if defined (__FreeBSD__) || defined (__OpenBSD__) 83 # include <netinet/if_ether.h> 84 #else 85 # include <net/ethertypes.h> 86 #endif 87 88 #ifdef IPX 89 #include <netproto/ipx/ipx.h> 90 #include <netproto/ipx/ipx_if.h> 91 #endif 92 93 #ifdef NS 94 #include <netns/ns.h> 95 #include <netns/ns_if.h> 96 #endif 97 98 #include "if_sppp.h" 99 100 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 101 # define UNTIMEOUT(fun, arg, handle) untimeout(fun, arg, handle) 102 # define TIMEOUT(fun, arg1, arg2, handle) handle = timeout(fun, arg1, arg2) 103 # define IOCTL_CMD_T u_long 104 #else 105 # define UNTIMEOUT(fun, arg, handle) untimeout(fun, arg) 106 # define TIMEOUT(fun, arg1, arg2, handle) timeout(fun, arg1, arg2) 107 # define IOCTL_CMD_T int 108 #endif 109 110 #define MAXALIVECNT 3 /* max. alive packets */ 111 112 /* 113 * Interface flags that can be set in an ifconfig command. 114 * 115 * Setting link0 will make the link passive, i.e. it will be marked 116 * as being administrative openable, but won't be opened to begin 117 * with. Incoming calls will be answered, or subsequent calls with 118 * -link1 will cause the administrative open of the LCP layer. 119 * 120 * Setting link1 will cause the link to auto-dial only as packets 121 * arrive to be sent. 122 * 123 * Setting IFF_DEBUG will syslog the option negotiation and state 124 * transitions at level kern.debug. Note: all logs consistently look 125 * like 126 * 127 * <if-name><unit>: <proto-name> <additional info...> 128 * 129 * with <if-name><unit> being something like "bppp0", and <proto-name> 130 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 131 */ 132 133 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 134 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 135 #define IFF_CISCO IFF_LINK2 /* auto-dial on output */ 136 137 #define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */ 138 #define PPP_UI 0x03 /* Unnumbered Information */ 139 #define PPP_IP 0x0021 /* Internet Protocol */ 140 #define PPP_ISO 0x0023 /* ISO OSI Protocol */ 141 #define PPP_XNS 0x0025 /* Xerox NS Protocol */ 142 #define PPP_IPX 0x002b /* Novell IPX Protocol */ 143 #define PPP_VJ_COMP 0x002d /* VJ compressed TCP/IP */ 144 #define PPP_VJ_UCOMP 0x002f /* VJ uncompressed TCP/IP */ 145 #define PPP_IPV6 0x0057 /* Internet Protocol Version 6 */ 146 #define PPP_LCP 0xc021 /* Link Control Protocol */ 147 #define PPP_PAP 0xc023 /* Password Authentication Protocol */ 148 #define PPP_CHAP 0xc223 /* Challenge-Handshake Auth Protocol */ 149 #define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */ 150 #define PPP_IPV6CP 0x8057 /* IPv6 Control Protocol */ 151 152 #define CONF_REQ 1 /* PPP configure request */ 153 #define CONF_ACK 2 /* PPP configure acknowledge */ 154 #define CONF_NAK 3 /* PPP configure negative ack */ 155 #define CONF_REJ 4 /* PPP configure reject */ 156 #define TERM_REQ 5 /* PPP terminate request */ 157 #define TERM_ACK 6 /* PPP terminate acknowledge */ 158 #define CODE_REJ 7 /* PPP code reject */ 159 #define PROTO_REJ 8 /* PPP protocol reject */ 160 #define ECHO_REQ 9 /* PPP echo request */ 161 #define ECHO_REPLY 10 /* PPP echo reply */ 162 #define DISC_REQ 11 /* PPP discard request */ 163 164 #define LCP_OPT_MRU 1 /* maximum receive unit */ 165 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 166 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 167 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 168 #define LCP_OPT_MAGIC 5 /* magic number */ 169 #define LCP_OPT_RESERVED 6 /* reserved */ 170 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 171 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 172 173 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 174 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol (VJ) */ 175 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 176 177 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 178 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 179 180 #define IPCP_COMP_VJ 0x2d /* Code for VJ compression */ 181 182 #define PAP_REQ 1 /* PAP name/password request */ 183 #define PAP_ACK 2 /* PAP acknowledge */ 184 #define PAP_NAK 3 /* PAP fail */ 185 186 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 187 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 188 #define CHAP_SUCCESS 3 /* CHAP response ok */ 189 #define CHAP_FAILURE 4 /* CHAP response failed */ 190 191 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 192 193 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 194 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 195 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 196 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 197 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 198 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 199 200 /* states are named and numbered according to RFC 1661 */ 201 #define STATE_INITIAL 0 202 #define STATE_STARTING 1 203 #define STATE_CLOSED 2 204 #define STATE_STOPPED 3 205 #define STATE_CLOSING 4 206 #define STATE_STOPPING 5 207 #define STATE_REQ_SENT 6 208 #define STATE_ACK_RCVD 7 209 #define STATE_ACK_SENT 8 210 #define STATE_OPENED 9 211 212 struct ppp_header { 213 u_char address; 214 u_char control; 215 u_short protocol; 216 } __attribute__((__packed__)); 217 #define PPP_HEADER_LEN sizeof (struct ppp_header) 218 219 struct lcp_header { 220 u_char type; 221 u_char ident; 222 u_short len; 223 } __attribute__((__packed__)); 224 #define LCP_HEADER_LEN sizeof (struct lcp_header) 225 226 struct cisco_packet { 227 u_long type; 228 u_long par1; 229 u_long par2; 230 u_short rel; 231 u_short time0; 232 u_short time1; 233 } __attribute__((__packed__)); 234 #define CISCO_PACKET_LEN sizeof (struct cisco_packet) 235 236 /* 237 * We follow the spelling and capitalization of RFC 1661 here, to make 238 * it easier comparing with the standard. Please refer to this RFC in 239 * case you can't make sense out of these abbreviation; it will also 240 * explain the semantics related to the various events and actions. 241 */ 242 struct cp { 243 u_short proto; /* PPP control protocol number */ 244 u_char protoidx; /* index into state table in struct sppp */ 245 u_char flags; 246 #define CP_LCP 0x01 /* this is the LCP */ 247 #define CP_AUTH 0x02 /* this is an authentication protocol */ 248 #define CP_NCP 0x04 /* this is a NCP */ 249 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 250 const char *name; /* name of this control protocol */ 251 /* event handlers */ 252 void (*Up)(struct sppp *sp); 253 void (*Down)(struct sppp *sp); 254 void (*Open)(struct sppp *sp); 255 void (*Close)(struct sppp *sp); 256 void (*TO)(void *sp); 257 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 258 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 259 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 260 /* actions */ 261 void (*tlu)(struct sppp *sp); 262 void (*tld)(struct sppp *sp); 263 void (*tls)(struct sppp *sp); 264 void (*tlf)(struct sppp *sp); 265 void (*scr)(struct sppp *sp); 266 }; 267 268 static struct sppp *spppq; 269 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 270 static struct callout_handle keepalive_ch; 271 #endif 272 273 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 && !defined(__DragonFly__) 274 #define SPP_FMT "%s%d: " 275 #define SPP_ARGS(ifp) (ifp)->if_name, (ifp)->if_unit 276 #else 277 #define SPP_FMT "%s: " 278 #define SPP_ARGS(ifp) (ifp)->if_xname 279 #endif 280 281 #ifdef INET 282 /* 283 * The following disgusting hack gets around the problem that IP TOS 284 * can't be set yet. We want to put "interactive" traffic on a high 285 * priority queue. To decide if traffic is interactive, we check that 286 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 287 * 288 * XXX is this really still necessary? - joerg - 289 */ 290 static u_short interactive_ports[8] = { 291 0, 513, 0, 0, 292 0, 21, 0, 23, 293 }; 294 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 295 #endif 296 297 /* almost every function needs these */ 298 #define STDDCL \ 299 struct ifnet *ifp = &sp->pp_if; \ 300 int debug = ifp->if_flags & IFF_DEBUG 301 302 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 303 struct sockaddr *dst, struct rtentry *rt); 304 305 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2); 306 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 307 308 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 309 struct mbuf *m); 310 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 311 u_char ident, u_short len, void *data); 312 /* static void sppp_cp_timeout(void *arg); */ 313 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 314 int newstate); 315 static void sppp_auth_send(const struct cp *cp, 316 struct sppp *sp, unsigned int type, unsigned int id, 317 ...); 318 319 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 320 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 321 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 322 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 323 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 324 325 static void sppp_null(struct sppp *sp); 326 327 static void sppp_lcp_init(struct sppp *sp); 328 static void sppp_lcp_up(struct sppp *sp); 329 static void sppp_lcp_down(struct sppp *sp); 330 static void sppp_lcp_open(struct sppp *sp); 331 static void sppp_lcp_close(struct sppp *sp); 332 static void sppp_lcp_TO(void *sp); 333 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 334 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 335 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 336 static void sppp_lcp_tlu(struct sppp *sp); 337 static void sppp_lcp_tld(struct sppp *sp); 338 static void sppp_lcp_tls(struct sppp *sp); 339 static void sppp_lcp_tlf(struct sppp *sp); 340 static void sppp_lcp_scr(struct sppp *sp); 341 static void sppp_lcp_check_and_close(struct sppp *sp); 342 static int sppp_ncp_check(struct sppp *sp); 343 344 static void sppp_ipcp_init(struct sppp *sp); 345 static void sppp_ipcp_up(struct sppp *sp); 346 static void sppp_ipcp_down(struct sppp *sp); 347 static void sppp_ipcp_open(struct sppp *sp); 348 static void sppp_ipcp_close(struct sppp *sp); 349 static void sppp_ipcp_TO(void *sp); 350 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 351 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 352 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 353 static void sppp_ipcp_tlu(struct sppp *sp); 354 static void sppp_ipcp_tld(struct sppp *sp); 355 static void sppp_ipcp_tls(struct sppp *sp); 356 static void sppp_ipcp_tlf(struct sppp *sp); 357 static void sppp_ipcp_scr(struct sppp *sp); 358 359 static void sppp_ipv6cp_init(struct sppp *sp); 360 static void sppp_ipv6cp_up(struct sppp *sp); 361 static void sppp_ipv6cp_down(struct sppp *sp); 362 static void sppp_ipv6cp_open(struct sppp *sp); 363 static void sppp_ipv6cp_close(struct sppp *sp); 364 static void sppp_ipv6cp_TO(void *sp); 365 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 366 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 367 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 368 static void sppp_ipv6cp_tlu(struct sppp *sp); 369 static void sppp_ipv6cp_tld(struct sppp *sp); 370 static void sppp_ipv6cp_tls(struct sppp *sp); 371 static void sppp_ipv6cp_tlf(struct sppp *sp); 372 static void sppp_ipv6cp_scr(struct sppp *sp); 373 374 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 375 static void sppp_pap_init(struct sppp *sp); 376 static void sppp_pap_open(struct sppp *sp); 377 static void sppp_pap_close(struct sppp *sp); 378 static void sppp_pap_TO(void *sp); 379 static void sppp_pap_my_TO(void *sp); 380 static void sppp_pap_tlu(struct sppp *sp); 381 static void sppp_pap_tld(struct sppp *sp); 382 static void sppp_pap_scr(struct sppp *sp); 383 384 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 385 static void sppp_chap_init(struct sppp *sp); 386 static void sppp_chap_open(struct sppp *sp); 387 static void sppp_chap_close(struct sppp *sp); 388 static void sppp_chap_TO(void *sp); 389 static void sppp_chap_tlu(struct sppp *sp); 390 static void sppp_chap_tld(struct sppp *sp); 391 static void sppp_chap_scr(struct sppp *sp); 392 393 static const char *sppp_auth_type_name(u_short proto, u_char type); 394 static const char *sppp_cp_type_name(u_char type); 395 static const char *sppp_dotted_quad(u_long addr); 396 static const char *sppp_ipcp_opt_name(u_char opt); 397 #ifdef INET6 398 static const char *sppp_ipv6cp_opt_name(u_char opt); 399 #endif 400 static const char *sppp_lcp_opt_name(u_char opt); 401 static const char *sppp_phase_name(enum ppp_phase phase); 402 static const char *sppp_proto_name(u_short proto); 403 static const char *sppp_state_name(int state); 404 static int sppp_params(struct sppp *sp, u_long cmd, void *data); 405 static int sppp_strnlen(u_char *p, int max); 406 static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, 407 u_long *srcmask); 408 static void sppp_keepalive(void *dummy); 409 static void sppp_phase_network(struct sppp *sp); 410 static void sppp_print_bytes(const u_char *p, u_short len); 411 static void sppp_print_string(const char *p, u_short len); 412 static void sppp_qflush(struct ifqueue *ifq); 413 static void sppp_set_ip_addr(struct sppp *sp, u_long src); 414 #ifdef INET6 415 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 416 struct in6_addr *dst, struct in6_addr *srcmask); 417 #ifdef IPV6CP_MYIFID_DYN 418 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 419 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 420 #endif 421 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 422 #endif 423 424 /* our control protocol descriptors */ 425 static const struct cp lcp = { 426 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 427 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 428 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 429 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 430 sppp_lcp_scr 431 }; 432 433 static const struct cp ipcp = { 434 PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp", 435 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 436 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 437 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 438 sppp_ipcp_scr 439 }; 440 441 static const struct cp ipv6cp = { 442 PPP_IPV6CP, IDX_IPV6CP, 443 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 444 CP_NCP, 445 #else 446 0, 447 #endif 448 "ipv6cp", 449 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 450 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 451 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 452 sppp_ipv6cp_scr 453 }; 454 455 static const struct cp pap = { 456 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 457 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 458 sppp_pap_TO, 0, 0, 0, 459 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 460 sppp_pap_scr 461 }; 462 463 static const struct cp chap = { 464 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 465 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 466 sppp_chap_TO, 0, 0, 0, 467 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 468 sppp_chap_scr 469 }; 470 471 static const struct cp *cps[IDX_COUNT] = { 472 &lcp, /* IDX_LCP */ 473 &ipcp, /* IDX_IPCP */ 474 &ipv6cp, /* IDX_IPV6CP */ 475 &pap, /* IDX_PAP */ 476 &chap, /* IDX_CHAP */ 477 }; 478 479 static int 480 sppp_modevent(module_t mod, int type, void *unused) 481 { 482 switch (type) { 483 case MOD_LOAD: 484 break; 485 case MOD_UNLOAD: 486 return EACCES; 487 break; 488 default: 489 break; 490 } 491 return 0; 492 } 493 static moduledata_t spppmod = { 494 "sppp", 495 sppp_modevent, 496 0 497 }; 498 MODULE_VERSION(sppp, 1); 499 DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY); 500 501 /* 502 * Exported functions, comprising our interface to the lower layer. 503 */ 504 505 /* 506 * Process the received packet. 507 */ 508 void 509 sppp_input(struct ifnet *ifp, struct mbuf *m) 510 { 511 struct ppp_header *h; 512 int isr = -1; 513 struct sppp *sp = (struct sppp *)ifp; 514 u_char *iphdr; 515 int hlen, vjlen, do_account = 0; 516 int debug = ifp->if_flags & IFF_DEBUG; 517 518 if (ifp->if_flags & IFF_UP) 519 /* Count received bytes, add FCS and one flag */ 520 ifp->if_ibytes += m->m_pkthdr.len + 3; 521 522 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 523 /* Too small packet, drop it. */ 524 if (debug) 525 log(LOG_DEBUG, 526 SPP_FMT "input packet is too small, %d bytes\n", 527 SPP_ARGS(ifp), m->m_pkthdr.len); 528 drop: 529 m_freem (m); 530 drop2: 531 ++ifp->if_ierrors; 532 ++ifp->if_iqdrops; 533 return; 534 } 535 536 /* Get PPP header. */ 537 h = mtod (m, struct ppp_header*); 538 m_adj (m, PPP_HEADER_LEN); 539 540 switch (h->address) { 541 case PPP_ALLSTATIONS: 542 if (h->control != PPP_UI) 543 goto invalid; 544 if (sp->pp_mode == IFF_CISCO) { 545 if (debug) 546 log(LOG_DEBUG, 547 SPP_FMT "PPP packet in Cisco mode " 548 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 549 SPP_ARGS(ifp), 550 h->address, h->control, ntohs(h->protocol)); 551 goto drop; 552 } 553 switch (ntohs (h->protocol)) { 554 default: 555 if (debug) 556 log(LOG_DEBUG, 557 SPP_FMT "rejecting protocol " 558 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 559 SPP_ARGS(ifp), 560 h->address, h->control, ntohs(h->protocol)); 561 if (sp->state[IDX_LCP] == STATE_OPENED) 562 sppp_cp_send (sp, PPP_LCP, PROTO_REJ, 563 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 564 &h->protocol); 565 ++ifp->if_noproto; 566 goto drop; 567 case PPP_LCP: 568 sppp_cp_input(&lcp, sp, m); 569 m_freem (m); 570 return; 571 case PPP_PAP: 572 if (sp->pp_phase >= PHASE_AUTHENTICATE) 573 sppp_pap_input(sp, m); 574 m_freem (m); 575 return; 576 case PPP_CHAP: 577 if (sp->pp_phase >= PHASE_AUTHENTICATE) 578 sppp_chap_input(sp, m); 579 m_freem (m); 580 return; 581 #ifdef INET 582 case PPP_IPCP: 583 if (sp->pp_phase == PHASE_NETWORK) 584 sppp_cp_input(&ipcp, sp, m); 585 m_freem (m); 586 return; 587 case PPP_IP: 588 if (sp->state[IDX_IPCP] == STATE_OPENED) { 589 isr = NETISR_IP; 590 } 591 do_account++; 592 break; 593 case PPP_VJ_COMP: 594 if (sp->state[IDX_IPCP] == STATE_OPENED) { 595 if ((vjlen = 596 sl_uncompress_tcp_core(mtod(m, u_char *), 597 m->m_len, m->m_len, 598 TYPE_COMPRESSED_TCP, 599 sp->pp_comp, 600 &iphdr, &hlen)) <= 0) { 601 if (debug) 602 log(LOG_INFO, 603 SPP_FMT "VJ uncompress failed on compressed packet\n", 604 SPP_ARGS(ifp)); 605 goto drop; 606 } 607 608 /* 609 * Trim the VJ header off the packet, and prepend 610 * the uncompressed IP header (which will usually 611 * end up in two chained mbufs since there's not 612 * enough leading space in the existing mbuf). 613 */ 614 m_adj(m, vjlen); 615 M_PREPEND(m, hlen, M_DONTWAIT); 616 if (m == NULL) 617 goto drop2; 618 bcopy(iphdr, mtod(m, u_char *), hlen); 619 620 isr = NETISR_IP; 621 } 622 do_account++; 623 break; 624 case PPP_VJ_UCOMP: 625 if (sp->state[IDX_IPCP] == STATE_OPENED) { 626 if (sl_uncompress_tcp_core(mtod(m, u_char *), 627 m->m_len, m->m_len, 628 TYPE_UNCOMPRESSED_TCP, 629 sp->pp_comp, 630 &iphdr, &hlen) != 0) { 631 if (debug) 632 log(LOG_INFO, 633 SPP_FMT "VJ uncompress failed on uncompressed packet\n", 634 SPP_ARGS(ifp)); 635 goto drop; 636 } 637 isr = NETISR_IP; 638 } 639 do_account++; 640 break; 641 #endif 642 #ifdef INET6 643 case PPP_IPV6CP: 644 if (sp->pp_phase == PHASE_NETWORK) 645 sppp_cp_input(&ipv6cp, sp, m); 646 m_freem (m); 647 return; 648 649 case PPP_IPV6: 650 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 651 isr = NETISR_IPV6; 652 } 653 do_account++; 654 break; 655 #endif 656 #ifdef IPX 657 case PPP_IPX: 658 /* IPX IPXCP not implemented yet */ 659 if (sp->pp_phase == PHASE_NETWORK) { 660 isr = NETISR_IPX; 661 } 662 do_account++; 663 break; 664 #endif 665 #ifdef NS 666 case PPP_XNS: 667 /* XNS IDPCP not implemented yet */ 668 if (sp->pp_phase == PHASE_NETWORK) { 669 isr = NETISR_NS; 670 } 671 do_account++; 672 break; 673 #endif 674 } 675 break; 676 case CISCO_MULTICAST: 677 case CISCO_UNICAST: 678 /* Don't check the control field here (RFC 1547). */ 679 if (sp->pp_mode != IFF_CISCO) { 680 if (debug) 681 log(LOG_DEBUG, 682 SPP_FMT "Cisco packet in PPP mode " 683 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 684 SPP_ARGS(ifp), 685 h->address, h->control, ntohs(h->protocol)); 686 goto drop; 687 } 688 switch (ntohs (h->protocol)) { 689 default: 690 ++ifp->if_noproto; 691 goto invalid; 692 case CISCO_KEEPALIVE: 693 sppp_cisco_input ((struct sppp*) ifp, m); 694 m_freem (m); 695 return; 696 #ifdef INET 697 case ETHERTYPE_IP: 698 isr = NETISR_IP; 699 do_account++; 700 break; 701 #endif 702 #ifdef INET6 703 case ETHERTYPE_IPV6: 704 isr = NETISR_IPV6; 705 do_account++; 706 break; 707 #endif 708 #ifdef IPX 709 case ETHERTYPE_IPX: 710 isr = NETISR_IPX; 711 do_account++; 712 break; 713 #endif 714 #ifdef NS 715 case ETHERTYPE_NS: 716 isr = NETISR_NS 717 do_account++; 718 break; 719 #endif 720 } 721 break; 722 default: /* Invalid PPP packet. */ 723 invalid: 724 if (debug) 725 log(LOG_DEBUG, 726 SPP_FMT "invalid input packet " 727 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 728 SPP_ARGS(ifp), 729 h->address, h->control, ntohs(h->protocol)); 730 goto drop; 731 } 732 733 if (! (ifp->if_flags & IFF_UP) || isr < 0) 734 goto drop; 735 736 /* Check queue. */ 737 738 netisr_dispatch(isr, m); 739 if (do_account) 740 /* 741 * Do only account for network packets, not for control 742 * packets. This is used by some subsystems to detect 743 * idle lines. 744 */ 745 sp->pp_last_recv = time_second; 746 } 747 748 /* 749 * Enqueue transmit packet. 750 */ 751 static int 752 sppp_output(struct ifnet *ifp, struct mbuf *m, 753 struct sockaddr *dst, struct rtentry *rt) 754 { 755 struct sppp *sp = (struct sppp*) ifp; 756 struct ppp_header *h; 757 struct ifqueue *ifq = NULL; 758 int s, rv = 0; 759 int ipproto = PPP_IP; 760 int debug = ifp->if_flags & IFF_DEBUG; 761 762 s = splimp(); 763 764 if ((ifp->if_flags & IFF_UP) == 0 || 765 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 766 #ifdef INET6 767 drop: 768 #endif 769 m_freem (m); 770 splx (s); 771 return (ENETDOWN); 772 } 773 774 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 775 #ifdef INET6 776 /* 777 * XXX 778 * 779 * Hack to prevent the initialization-time generated 780 * IPv6 multicast packet to erroneously cause a 781 * dialout event in case IPv6 has been 782 * administratively disabled on that interface. 783 */ 784 if (dst->sa_family == AF_INET6 && 785 !(sp->confflags & CONF_ENABLE_IPV6)) 786 goto drop; 787 #endif 788 /* 789 * Interface is not yet running, but auto-dial. Need 790 * to start LCP for it. 791 */ 792 ifp->if_flags |= IFF_RUNNING; 793 splx(s); 794 lcp.Open(sp); 795 s = splimp(); 796 } 797 798 ifq = &ifp->if_snd; 799 #ifdef INET 800 if (dst->sa_family == AF_INET) { 801 /* XXX Check mbuf length here? */ 802 struct ip *ip = mtod (m, struct ip*); 803 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl); 804 805 /* 806 * When using dynamic local IP address assignment by using 807 * 0.0.0.0 as a local address, the first TCP session will 808 * not connect because the local TCP checksum is computed 809 * using 0.0.0.0 which will later become our real IP address 810 * so the TCP checksum computed at the remote end will 811 * become invalid. So we 812 * - don't let packets with src ip addr 0 thru 813 * - we flag TCP packets with src ip 0 as an error 814 */ 815 816 if(ip->ip_src.s_addr == INADDR_ANY) /* -hm */ 817 { 818 m_freem(m); 819 splx(s); 820 if(ip->ip_p == IPPROTO_TCP) 821 return(EADDRNOTAVAIL); 822 else 823 return(0); 824 } 825 826 /* 827 * Put low delay, telnet, rlogin and ftp control packets 828 * in front of the queue. 829 */ 830 if (IF_QFULL (&sp->pp_fastq)) 831 ; 832 else if (ip->ip_tos & IPTOS_LOWDELAY) 833 ifq = &sp->pp_fastq; 834 else if (m->m_len < sizeof *ip + sizeof *tcp) 835 ; 836 else if (ip->ip_p != IPPROTO_TCP) 837 ; 838 else if (INTERACTIVE (ntohs (tcp->th_sport))) 839 ifq = &sp->pp_fastq; 840 else if (INTERACTIVE (ntohs (tcp->th_dport))) 841 ifq = &sp->pp_fastq; 842 843 /* 844 * Do IP Header compression 845 */ 846 if (sp->pp_mode != IFF_CISCO && (sp->ipcp.flags & IPCP_VJ) && 847 ip->ip_p == IPPROTO_TCP) 848 switch (sl_compress_tcp(m, ip, sp->pp_comp, 849 sp->ipcp.compress_cid)) { 850 case TYPE_COMPRESSED_TCP: 851 ipproto = PPP_VJ_COMP; 852 break; 853 case TYPE_UNCOMPRESSED_TCP: 854 ipproto = PPP_VJ_UCOMP; 855 break; 856 case TYPE_IP: 857 ipproto = PPP_IP; 858 break; 859 default: 860 m_freem(m); 861 splx(s); 862 return (EINVAL); 863 } 864 } 865 #endif 866 867 #ifdef INET6 868 if (dst->sa_family == AF_INET6) { 869 /* XXX do something tricky here? */ 870 } 871 #endif 872 873 /* 874 * Prepend general data packet PPP header. For now, IP only. 875 */ 876 M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT); 877 if (! m) { 878 if (debug) 879 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n", 880 SPP_ARGS(ifp)); 881 ++ifp->if_oerrors; 882 splx (s); 883 return (ENOBUFS); 884 } 885 /* 886 * May want to check size of packet 887 * (albeit due to the implementation it's always enough) 888 */ 889 h = mtod (m, struct ppp_header*); 890 if (sp->pp_mode == IFF_CISCO) { 891 h->address = CISCO_UNICAST; /* unicast address */ 892 h->control = 0; 893 } else { 894 h->address = PPP_ALLSTATIONS; /* broadcast address */ 895 h->control = PPP_UI; /* Unnumbered Info */ 896 } 897 898 switch (dst->sa_family) { 899 #ifdef INET 900 case AF_INET: /* Internet Protocol */ 901 if (sp->pp_mode == IFF_CISCO) 902 h->protocol = htons (ETHERTYPE_IP); 903 else { 904 /* 905 * Don't choke with an ENETDOWN early. It's 906 * possible that we just started dialing out, 907 * so don't drop the packet immediately. If 908 * we notice that we run out of buffer space 909 * below, we will however remember that we are 910 * not ready to carry IP packets, and return 911 * ENETDOWN, as opposed to ENOBUFS. 912 */ 913 h->protocol = htons(ipproto); 914 if (sp->state[IDX_IPCP] != STATE_OPENED) 915 rv = ENETDOWN; 916 } 917 break; 918 #endif 919 #ifdef INET6 920 case AF_INET6: /* Internet Protocol */ 921 if (sp->pp_mode == IFF_CISCO) 922 h->protocol = htons (ETHERTYPE_IPV6); 923 else { 924 /* 925 * Don't choke with an ENETDOWN early. It's 926 * possible that we just started dialing out, 927 * so don't drop the packet immediately. If 928 * we notice that we run out of buffer space 929 * below, we will however remember that we are 930 * not ready to carry IP packets, and return 931 * ENETDOWN, as opposed to ENOBUFS. 932 */ 933 h->protocol = htons(PPP_IPV6); 934 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 935 rv = ENETDOWN; 936 } 937 break; 938 #endif 939 #ifdef NS 940 case AF_NS: /* Xerox NS Protocol */ 941 h->protocol = htons (sp->pp_mode == IFF_CISCO ? 942 ETHERTYPE_NS : PPP_XNS); 943 break; 944 #endif 945 #ifdef IPX 946 case AF_IPX: /* Novell IPX Protocol */ 947 h->protocol = htons (sp->pp_mode == IFF_CISCO ? 948 ETHERTYPE_IPX : PPP_IPX); 949 break; 950 #endif 951 default: 952 m_freem (m); 953 ++ifp->if_oerrors; 954 splx (s); 955 return (EAFNOSUPPORT); 956 } 957 958 /* 959 * Queue message on interface, and start output if interface 960 * not yet active. 961 */ 962 if (IF_QFULL (ifq)) { 963 IF_DROP (&ifp->if_snd); 964 m_freem (m); 965 ++ifp->if_oerrors; 966 splx (s); 967 return (rv? rv: ENOBUFS); 968 } 969 IF_ENQUEUE (ifq, m); 970 if (! (ifp->if_flags & IFF_OACTIVE)) 971 (*ifp->if_start) (ifp); 972 973 /* 974 * Count output packets and bytes. 975 * The packet length includes header, FCS and 1 flag, 976 * according to RFC 1333. 977 */ 978 ifp->if_obytes += m->m_pkthdr.len + 3; 979 splx (s); 980 /* 981 * Unlike in sppp_input(), we can always bump the timestamp 982 * here since sppp_output() is only called on behalf of 983 * network-layer traffic; control-layer traffic is handled 984 * by sppp_cp_send(). 985 */ 986 sp->pp_last_sent = time_second; 987 return (0); 988 } 989 990 void 991 sppp_attach(struct ifnet *ifp) 992 { 993 struct sppp *sp = (struct sppp*) ifp; 994 995 /* Initialize keepalive handler. */ 996 if (! spppq) 997 TIMEOUT(sppp_keepalive, 0, hz * 10, keepalive_ch); 998 999 /* Insert new entry into the keepalive list. */ 1000 sp->pp_next = spppq; 1001 spppq = sp; 1002 1003 sp->pp_if.if_mtu = PP_MTU; 1004 sp->pp_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 1005 sp->pp_if.if_type = IFT_PPP; 1006 sp->pp_if.if_output = sppp_output; 1007 #if 0 1008 sp->pp_flags = PP_KEEPALIVE; 1009 #endif 1010 sp->pp_if.if_snd.ifq_maxlen = 32; 1011 sp->pp_fastq.ifq_maxlen = 32; 1012 sp->pp_cpq.ifq_maxlen = 20; 1013 sp->pp_loopcnt = 0; 1014 sp->pp_alivecnt = 0; 1015 bzero(&sp->pp_seq[0], sizeof(sp->pp_seq)); 1016 bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq)); 1017 sp->pp_phase = PHASE_DEAD; 1018 sp->pp_up = lcp.Up; 1019 sp->pp_down = lcp.Down; 1020 sp->pp_last_recv = sp->pp_last_sent = time_second; 1021 sp->confflags = 0; 1022 #ifdef INET 1023 sp->confflags |= CONF_ENABLE_VJ; 1024 #endif 1025 #ifdef INET6 1026 sp->confflags |= CONF_ENABLE_IPV6; 1027 #endif 1028 sp->pp_comp = malloc(sizeof(struct slcompress), M_TEMP, M_WAIT); 1029 sl_compress_init(sp->pp_comp, -1); 1030 sppp_lcp_init(sp); 1031 sppp_ipcp_init(sp); 1032 sppp_ipv6cp_init(sp); 1033 sppp_pap_init(sp); 1034 sppp_chap_init(sp); 1035 } 1036 1037 void 1038 sppp_detach(struct ifnet *ifp) 1039 { 1040 struct sppp **q, *p, *sp = (struct sppp*) ifp; 1041 int i; 1042 1043 /* Remove the entry from the keepalive list. */ 1044 for (q = &spppq; (p = *q); q = &p->pp_next) 1045 if (p == sp) { 1046 *q = p->pp_next; 1047 break; 1048 } 1049 1050 /* Stop keepalive handler. */ 1051 if (! spppq) 1052 UNTIMEOUT(sppp_keepalive, 0, keepalive_ch); 1053 1054 for (i = 0; i < IDX_COUNT; i++) 1055 UNTIMEOUT((cps[i])->TO, (void *)sp, sp->ch[i]); 1056 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 1057 } 1058 1059 /* 1060 * Flush the interface output queue. 1061 */ 1062 void 1063 sppp_flush(struct ifnet *ifp) 1064 { 1065 struct sppp *sp = (struct sppp*) ifp; 1066 1067 sppp_qflush (&sp->pp_if.if_snd); 1068 sppp_qflush (&sp->pp_fastq); 1069 sppp_qflush (&sp->pp_cpq); 1070 } 1071 1072 /* 1073 * Check if the output queue is empty. 1074 */ 1075 int 1076 sppp_isempty(struct ifnet *ifp) 1077 { 1078 struct sppp *sp = (struct sppp*) ifp; 1079 int empty, s; 1080 1081 s = splimp(); 1082 empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head && 1083 !sp->pp_if.if_snd.ifq_head; 1084 splx(s); 1085 return (empty); 1086 } 1087 1088 /* 1089 * Get next packet to send. 1090 */ 1091 struct mbuf * 1092 sppp_dequeue(struct ifnet *ifp) 1093 { 1094 struct sppp *sp = (struct sppp*) ifp; 1095 struct mbuf *m; 1096 int s; 1097 1098 s = splimp(); 1099 /* 1100 * Process only the control protocol queue until we have at 1101 * least one NCP open. 1102 * 1103 * Do always serve all three queues in Cisco mode. 1104 */ 1105 IF_DEQUEUE(&sp->pp_cpq, m); 1106 if (m == NULL && 1107 (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO)) { 1108 IF_DEQUEUE(&sp->pp_fastq, m); 1109 if (m == NULL) 1110 IF_DEQUEUE (&sp->pp_if.if_snd, m); 1111 } 1112 splx(s); 1113 return m; 1114 } 1115 1116 /* 1117 * Pick the next packet, do not remove it from the queue. 1118 */ 1119 struct mbuf * 1120 sppp_pick(struct ifnet *ifp) 1121 { 1122 struct sppp *sp = (struct sppp*)ifp; 1123 struct mbuf *m; 1124 int s; 1125 1126 s= splimp (); 1127 1128 m = sp->pp_cpq.ifq_head; 1129 if (m == NULL && 1130 (sp->pp_phase == PHASE_NETWORK || sp->pp_mode == IFF_CISCO)) 1131 if ((m = sp->pp_fastq.ifq_head) == NULL) 1132 m = sp->pp_if.if_snd.ifq_head; 1133 splx (s); 1134 return (m); 1135 } 1136 1137 /* 1138 * Process an ioctl request. Called on low priority level. 1139 */ 1140 int 1141 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data) 1142 { 1143 struct ifreq *ifr = (struct ifreq*) data; 1144 struct sppp *sp = (struct sppp*) ifp; 1145 int s, rv, going_up, going_down, newmode; 1146 1147 s = splimp(); 1148 rv = 0; 1149 switch (cmd) { 1150 case SIOCAIFADDR: 1151 case SIOCSIFDSTADDR: 1152 break; 1153 1154 case SIOCSIFADDR: 1155 /* set the interface "up" when assigning an IP address */ 1156 ifp->if_flags |= IFF_UP; 1157 /* fall through... */ 1158 1159 case SIOCSIFFLAGS: 1160 going_up = ifp->if_flags & IFF_UP && 1161 (ifp->if_flags & IFF_RUNNING) == 0; 1162 going_down = (ifp->if_flags & IFF_UP) == 0 && 1163 ifp->if_flags & IFF_RUNNING; 1164 1165 newmode = ifp->if_flags & IFF_PASSIVE; 1166 if (!newmode) 1167 newmode = ifp->if_flags & IFF_AUTO; 1168 if (!newmode) 1169 newmode = ifp->if_flags & IFF_CISCO; 1170 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO); 1171 ifp->if_flags |= newmode; 1172 1173 if (newmode != sp->pp_mode) { 1174 going_down = 1; 1175 if (!going_up) 1176 going_up = ifp->if_flags & IFF_RUNNING; 1177 } 1178 1179 if (going_down) { 1180 if (sp->pp_mode != IFF_CISCO) 1181 lcp.Close(sp); 1182 else if (sp->pp_tlf) 1183 (sp->pp_tlf)(sp); 1184 sppp_flush(ifp); 1185 ifp->if_flags &= ~IFF_RUNNING; 1186 sp->pp_mode = newmode; 1187 } 1188 1189 if (going_up) { 1190 if (sp->pp_mode != IFF_CISCO) 1191 lcp.Close(sp); 1192 sp->pp_mode = newmode; 1193 if (sp->pp_mode == 0) { 1194 ifp->if_flags |= IFF_RUNNING; 1195 lcp.Open(sp); 1196 } 1197 if (sp->pp_mode == IFF_CISCO) { 1198 if (sp->pp_tls) 1199 (sp->pp_tls)(sp); 1200 ifp->if_flags |= IFF_RUNNING; 1201 } 1202 } 1203 1204 break; 1205 1206 #ifdef SIOCSIFMTU 1207 #ifndef ifr_mtu 1208 #define ifr_mtu ifr_metric 1209 #endif 1210 case SIOCSIFMTU: 1211 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) 1212 return (EINVAL); 1213 ifp->if_mtu = ifr->ifr_mtu; 1214 break; 1215 #endif 1216 #ifdef SLIOCSETMTU 1217 case SLIOCSETMTU: 1218 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru) 1219 return (EINVAL); 1220 ifp->if_mtu = *(short*)data; 1221 break; 1222 #endif 1223 #ifdef SIOCGIFMTU 1224 case SIOCGIFMTU: 1225 ifr->ifr_mtu = ifp->if_mtu; 1226 break; 1227 #endif 1228 #ifdef SLIOCGETMTU 1229 case SLIOCGETMTU: 1230 *(short*)data = ifp->if_mtu; 1231 break; 1232 #endif 1233 case SIOCADDMULTI: 1234 case SIOCDELMULTI: 1235 break; 1236 1237 case SIOCGIFGENERIC: 1238 case SIOCSIFGENERIC: 1239 rv = sppp_params(sp, cmd, data); 1240 break; 1241 1242 default: 1243 rv = ENOTTY; 1244 } 1245 splx(s); 1246 return rv; 1247 } 1248 1249 /* 1250 * Cisco framing implementation. 1251 */ 1252 1253 /* 1254 * Handle incoming Cisco keepalive protocol packets. 1255 */ 1256 static void 1257 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1258 { 1259 STDDCL; 1260 struct cisco_packet *h; 1261 u_long me, mymask; 1262 1263 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1264 if (debug) 1265 log(LOG_DEBUG, 1266 SPP_FMT "cisco invalid packet length: %d bytes\n", 1267 SPP_ARGS(ifp), m->m_pkthdr.len); 1268 return; 1269 } 1270 h = mtod (m, struct cisco_packet*); 1271 if (debug) 1272 log(LOG_DEBUG, 1273 SPP_FMT "cisco input: %d bytes " 1274 "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n", 1275 SPP_ARGS(ifp), m->m_pkthdr.len, 1276 (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel, 1277 (u_int)h->time0, (u_int)h->time1); 1278 switch (ntohl (h->type)) { 1279 default: 1280 if (debug) 1281 addlog(SPP_FMT "cisco unknown packet type: 0x%lx\n", 1282 SPP_ARGS(ifp), (u_long)ntohl (h->type)); 1283 break; 1284 case CISCO_ADDR_REPLY: 1285 /* Reply on address request, ignore */ 1286 break; 1287 case CISCO_KEEPALIVE_REQ: 1288 sp->pp_alivecnt = 0; 1289 sp->pp_rseq[IDX_LCP] = ntohl (h->par1); 1290 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1291 /* Local and remote sequence numbers are equal. 1292 * Probably, the line is in loopback mode. */ 1293 if (sp->pp_loopcnt >= MAXALIVECNT) { 1294 printf (SPP_FMT "loopback\n", 1295 SPP_ARGS(ifp)); 1296 sp->pp_loopcnt = 0; 1297 if (ifp->if_flags & IFF_UP) { 1298 if_down (ifp); 1299 sppp_qflush (&sp->pp_cpq); 1300 } 1301 } 1302 ++sp->pp_loopcnt; 1303 1304 /* Generate new local sequence number */ 1305 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1306 sp->pp_seq[IDX_LCP] = random(); 1307 #else 1308 sp->pp_seq[IDX_LCP] ^= time.tv_sec ^ time.tv_usec; 1309 #endif 1310 break; 1311 } 1312 sp->pp_loopcnt = 0; 1313 if (! (ifp->if_flags & IFF_UP) && 1314 (ifp->if_flags & IFF_RUNNING)) { 1315 if_up(ifp); 1316 printf (SPP_FMT "up\n", SPP_ARGS(ifp)); 1317 } 1318 break; 1319 case CISCO_ADDR_REQ: 1320 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1321 if (me != 0L) 1322 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1323 break; 1324 } 1325 } 1326 1327 /* 1328 * Send Cisco keepalive packet. 1329 */ 1330 static void 1331 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2) 1332 { 1333 STDDCL; 1334 struct ppp_header *h; 1335 struct cisco_packet *ch; 1336 struct mbuf *m; 1337 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1338 struct timeval tv; 1339 #else 1340 u_long t = (time.tv_sec - boottime.tv_sec) * 1000; 1341 #endif 1342 1343 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1344 getmicrouptime(&tv); 1345 #endif 1346 1347 MGETHDR (m, M_DONTWAIT, MT_DATA); 1348 if (! m) 1349 return; 1350 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1351 m->m_pkthdr.rcvif = 0; 1352 1353 h = mtod (m, struct ppp_header*); 1354 h->address = CISCO_MULTICAST; 1355 h->control = 0; 1356 h->protocol = htons (CISCO_KEEPALIVE); 1357 1358 ch = (struct cisco_packet*) (h + 1); 1359 ch->type = htonl (type); 1360 ch->par1 = htonl (par1); 1361 ch->par2 = htonl (par2); 1362 ch->rel = -1; 1363 1364 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1365 ch->time0 = htons ((u_short) (tv.tv_sec >> 16)); 1366 ch->time1 = htons ((u_short) tv.tv_sec); 1367 #else 1368 ch->time0 = htons ((u_short) (t >> 16)); 1369 ch->time1 = htons ((u_short) t); 1370 #endif 1371 1372 if (debug) 1373 log(LOG_DEBUG, 1374 SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n", 1375 SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1, 1376 (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1); 1377 1378 if (IF_QFULL (&sp->pp_cpq)) { 1379 IF_DROP (&sp->pp_fastq); 1380 IF_DROP (&ifp->if_snd); 1381 m_freem (m); 1382 } else 1383 IF_ENQUEUE (&sp->pp_cpq, m); 1384 if (! (ifp->if_flags & IFF_OACTIVE)) 1385 (*ifp->if_start) (ifp); 1386 ifp->if_obytes += m->m_pkthdr.len + 3; 1387 } 1388 1389 /* 1390 * PPP protocol implementation. 1391 */ 1392 1393 /* 1394 * Send PPP control protocol packet. 1395 */ 1396 static void 1397 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1398 u_char ident, u_short len, void *data) 1399 { 1400 STDDCL; 1401 struct ppp_header *h; 1402 struct lcp_header *lh; 1403 struct mbuf *m; 1404 1405 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) 1406 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN; 1407 MGETHDR (m, M_DONTWAIT, MT_DATA); 1408 if (! m) 1409 return; 1410 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len; 1411 m->m_pkthdr.rcvif = 0; 1412 1413 h = mtod (m, struct ppp_header*); 1414 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1415 h->control = PPP_UI; /* Unnumbered Info */ 1416 h->protocol = htons (proto); /* Link Control Protocol */ 1417 1418 lh = (struct lcp_header*) (h + 1); 1419 lh->type = type; 1420 lh->ident = ident; 1421 lh->len = htons (LCP_HEADER_LEN + len); 1422 if (len) 1423 bcopy (data, lh+1, len); 1424 1425 if (debug) { 1426 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 1427 SPP_ARGS(ifp), 1428 sppp_proto_name(proto), 1429 sppp_cp_type_name (lh->type), lh->ident, 1430 ntohs (lh->len)); 1431 sppp_print_bytes ((u_char*) (lh+1), len); 1432 addlog(">\n"); 1433 } 1434 if (IF_QFULL (&sp->pp_cpq)) { 1435 IF_DROP (&sp->pp_fastq); 1436 IF_DROP (&ifp->if_snd); 1437 m_freem (m); 1438 ++ifp->if_oerrors; 1439 } else 1440 IF_ENQUEUE (&sp->pp_cpq, m); 1441 if (! (ifp->if_flags & IFF_OACTIVE)) 1442 (*ifp->if_start) (ifp); 1443 ifp->if_obytes += m->m_pkthdr.len + 3; 1444 } 1445 1446 /* 1447 * Handle incoming PPP control protocol packets. 1448 */ 1449 static void 1450 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1451 { 1452 STDDCL; 1453 struct lcp_header *h; 1454 int len = m->m_pkthdr.len; 1455 int rv; 1456 u_char *p; 1457 1458 if (len < 4) { 1459 if (debug) 1460 log(LOG_DEBUG, 1461 SPP_FMT "%s invalid packet length: %d bytes\n", 1462 SPP_ARGS(ifp), cp->name, len); 1463 return; 1464 } 1465 h = mtod (m, struct lcp_header*); 1466 if (debug) { 1467 log(LOG_DEBUG, 1468 SPP_FMT "%s input(%s): <%s id=0x%x len=%d", 1469 SPP_ARGS(ifp), cp->name, 1470 sppp_state_name(sp->state[cp->protoidx]), 1471 sppp_cp_type_name (h->type), h->ident, ntohs (h->len)); 1472 sppp_print_bytes ((u_char*) (h+1), len-4); 1473 addlog(">\n"); 1474 } 1475 if (len > ntohs (h->len)) 1476 len = ntohs (h->len); 1477 p = (u_char *)(h + 1); 1478 switch (h->type) { 1479 case CONF_REQ: 1480 if (len < 4) { 1481 if (debug) 1482 addlog(SPP_FMT "%s invalid conf-req length %d\n", 1483 SPP_ARGS(ifp), cp->name, 1484 len); 1485 ++ifp->if_ierrors; 1486 break; 1487 } 1488 /* handle states where RCR doesn't get a SCA/SCN */ 1489 switch (sp->state[cp->protoidx]) { 1490 case STATE_CLOSING: 1491 case STATE_STOPPING: 1492 return; 1493 case STATE_CLOSED: 1494 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1495 0, 0); 1496 return; 1497 } 1498 rv = (cp->RCR)(sp, h, len); 1499 switch (sp->state[cp->protoidx]) { 1500 case STATE_OPENED: 1501 (cp->tld)(sp); 1502 (cp->scr)(sp); 1503 /* fall through... */ 1504 case STATE_ACK_SENT: 1505 case STATE_REQ_SENT: 1506 /* 1507 * sppp_cp_change_state() have the side effect of 1508 * restarting the timeouts. We want to avoid that 1509 * if the state don't change, otherwise we won't 1510 * ever timeout and resend a configuration request 1511 * that got lost. 1512 */ 1513 if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT: 1514 STATE_REQ_SENT)) 1515 break; 1516 sppp_cp_change_state(cp, sp, rv? 1517 STATE_ACK_SENT: STATE_REQ_SENT); 1518 break; 1519 case STATE_STOPPED: 1520 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1521 (cp->scr)(sp); 1522 sppp_cp_change_state(cp, sp, rv? 1523 STATE_ACK_SENT: STATE_REQ_SENT); 1524 break; 1525 case STATE_ACK_RCVD: 1526 if (rv) { 1527 sppp_cp_change_state(cp, sp, STATE_OPENED); 1528 if (debug) 1529 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1530 SPP_ARGS(ifp), 1531 cp->name); 1532 (cp->tlu)(sp); 1533 } else 1534 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1535 break; 1536 default: 1537 printf(SPP_FMT "%s illegal %s in state %s\n", 1538 SPP_ARGS(ifp), cp->name, 1539 sppp_cp_type_name(h->type), 1540 sppp_state_name(sp->state[cp->protoidx])); 1541 ++ifp->if_ierrors; 1542 } 1543 break; 1544 case CONF_ACK: 1545 if (h->ident != sp->confid[cp->protoidx]) { 1546 if (debug) 1547 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1548 SPP_ARGS(ifp), cp->name, 1549 h->ident, sp->confid[cp->protoidx]); 1550 ++ifp->if_ierrors; 1551 break; 1552 } 1553 switch (sp->state[cp->protoidx]) { 1554 case STATE_CLOSED: 1555 case STATE_STOPPED: 1556 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1557 break; 1558 case STATE_CLOSING: 1559 case STATE_STOPPING: 1560 break; 1561 case STATE_REQ_SENT: 1562 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1563 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1564 break; 1565 case STATE_OPENED: 1566 (cp->tld)(sp); 1567 /* fall through */ 1568 case STATE_ACK_RCVD: 1569 (cp->scr)(sp); 1570 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1571 break; 1572 case STATE_ACK_SENT: 1573 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1574 sppp_cp_change_state(cp, sp, STATE_OPENED); 1575 if (debug) 1576 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1577 SPP_ARGS(ifp), cp->name); 1578 (cp->tlu)(sp); 1579 break; 1580 default: 1581 printf(SPP_FMT "%s illegal %s in state %s\n", 1582 SPP_ARGS(ifp), cp->name, 1583 sppp_cp_type_name(h->type), 1584 sppp_state_name(sp->state[cp->protoidx])); 1585 ++ifp->if_ierrors; 1586 } 1587 break; 1588 case CONF_NAK: 1589 case CONF_REJ: 1590 if (h->ident != sp->confid[cp->protoidx]) { 1591 if (debug) 1592 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1593 SPP_ARGS(ifp), cp->name, 1594 h->ident, sp->confid[cp->protoidx]); 1595 ++ifp->if_ierrors; 1596 break; 1597 } 1598 if (h->type == CONF_NAK) 1599 (cp->RCN_nak)(sp, h, len); 1600 else /* CONF_REJ */ 1601 (cp->RCN_rej)(sp, h, len); 1602 1603 switch (sp->state[cp->protoidx]) { 1604 case STATE_CLOSED: 1605 case STATE_STOPPED: 1606 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1607 break; 1608 case STATE_REQ_SENT: 1609 case STATE_ACK_SENT: 1610 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1611 /* 1612 * Slow things down a bit if we think we might be 1613 * in loopback. Depend on the timeout to send the 1614 * next configuration request. 1615 */ 1616 if (sp->pp_loopcnt) 1617 break; 1618 (cp->scr)(sp); 1619 break; 1620 case STATE_OPENED: 1621 (cp->tld)(sp); 1622 /* fall through */ 1623 case STATE_ACK_RCVD: 1624 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1625 (cp->scr)(sp); 1626 break; 1627 case STATE_CLOSING: 1628 case STATE_STOPPING: 1629 break; 1630 default: 1631 printf(SPP_FMT "%s illegal %s in state %s\n", 1632 SPP_ARGS(ifp), cp->name, 1633 sppp_cp_type_name(h->type), 1634 sppp_state_name(sp->state[cp->protoidx])); 1635 ++ifp->if_ierrors; 1636 } 1637 break; 1638 1639 case TERM_REQ: 1640 switch (sp->state[cp->protoidx]) { 1641 case STATE_ACK_RCVD: 1642 case STATE_ACK_SENT: 1643 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1644 /* fall through */ 1645 case STATE_CLOSED: 1646 case STATE_STOPPED: 1647 case STATE_CLOSING: 1648 case STATE_STOPPING: 1649 case STATE_REQ_SENT: 1650 sta: 1651 /* Send Terminate-Ack packet. */ 1652 if (debug) 1653 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n", 1654 SPP_ARGS(ifp), cp->name); 1655 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1656 break; 1657 case STATE_OPENED: 1658 (cp->tld)(sp); 1659 sp->rst_counter[cp->protoidx] = 0; 1660 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1661 goto sta; 1662 break; 1663 default: 1664 printf(SPP_FMT "%s illegal %s in state %s\n", 1665 SPP_ARGS(ifp), cp->name, 1666 sppp_cp_type_name(h->type), 1667 sppp_state_name(sp->state[cp->protoidx])); 1668 ++ifp->if_ierrors; 1669 } 1670 break; 1671 case TERM_ACK: 1672 switch (sp->state[cp->protoidx]) { 1673 case STATE_CLOSED: 1674 case STATE_STOPPED: 1675 case STATE_REQ_SENT: 1676 case STATE_ACK_SENT: 1677 break; 1678 case STATE_CLOSING: 1679 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1680 (cp->tlf)(sp); 1681 break; 1682 case STATE_STOPPING: 1683 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1684 (cp->tlf)(sp); 1685 break; 1686 case STATE_ACK_RCVD: 1687 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1688 break; 1689 case STATE_OPENED: 1690 (cp->tld)(sp); 1691 (cp->scr)(sp); 1692 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1693 break; 1694 default: 1695 printf(SPP_FMT "%s illegal %s in state %s\n", 1696 SPP_ARGS(ifp), cp->name, 1697 sppp_cp_type_name(h->type), 1698 sppp_state_name(sp->state[cp->protoidx])); 1699 ++ifp->if_ierrors; 1700 } 1701 break; 1702 case CODE_REJ: 1703 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1704 log(LOG_INFO, 1705 SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, " 1706 "danger will robinson\n", 1707 SPP_ARGS(ifp), cp->name, 1708 sppp_cp_type_name(h->type), ntohs(*((u_short *)p))); 1709 switch (sp->state[cp->protoidx]) { 1710 case STATE_CLOSED: 1711 case STATE_STOPPED: 1712 case STATE_REQ_SENT: 1713 case STATE_ACK_SENT: 1714 case STATE_CLOSING: 1715 case STATE_STOPPING: 1716 case STATE_OPENED: 1717 break; 1718 case STATE_ACK_RCVD: 1719 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1720 break; 1721 default: 1722 printf(SPP_FMT "%s illegal %s in state %s\n", 1723 SPP_ARGS(ifp), cp->name, 1724 sppp_cp_type_name(h->type), 1725 sppp_state_name(sp->state[cp->protoidx])); 1726 ++ifp->if_ierrors; 1727 } 1728 break; 1729 case PROTO_REJ: 1730 { 1731 int catastrophic; 1732 const struct cp *upper; 1733 int i; 1734 u_int16_t proto; 1735 1736 catastrophic = 0; 1737 upper = NULL; 1738 proto = ntohs(*((u_int16_t *)p)); 1739 for (i = 0; i < IDX_COUNT; i++) { 1740 if (cps[i]->proto == proto) { 1741 upper = cps[i]; 1742 break; 1743 } 1744 } 1745 if (upper == NULL) 1746 catastrophic++; 1747 1748 if (catastrophic || debug) 1749 log(catastrophic? LOG_INFO: LOG_DEBUG, 1750 SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1751 SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+', 1752 sppp_cp_type_name(h->type), proto, 1753 upper ? upper->name : "unknown", 1754 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1755 1756 /* 1757 * if we got RXJ+ against conf-req, the peer does not implement 1758 * this particular protocol type. terminate the protocol. 1759 */ 1760 if (upper && !catastrophic) { 1761 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1762 upper->Close(sp); 1763 break; 1764 } 1765 } 1766 1767 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1768 switch (sp->state[cp->protoidx]) { 1769 case STATE_CLOSED: 1770 case STATE_STOPPED: 1771 case STATE_REQ_SENT: 1772 case STATE_ACK_SENT: 1773 case STATE_CLOSING: 1774 case STATE_STOPPING: 1775 case STATE_OPENED: 1776 break; 1777 case STATE_ACK_RCVD: 1778 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1779 break; 1780 default: 1781 printf(SPP_FMT "%s illegal %s in state %s\n", 1782 SPP_ARGS(ifp), cp->name, 1783 sppp_cp_type_name(h->type), 1784 sppp_state_name(sp->state[cp->protoidx])); 1785 ++ifp->if_ierrors; 1786 } 1787 break; 1788 } 1789 case DISC_REQ: 1790 if (cp->proto != PPP_LCP) 1791 goto illegal; 1792 /* Discard the packet. */ 1793 break; 1794 case ECHO_REQ: 1795 if (cp->proto != PPP_LCP) 1796 goto illegal; 1797 if (sp->state[cp->protoidx] != STATE_OPENED) { 1798 if (debug) 1799 addlog(SPP_FMT "lcp echo req but lcp closed\n", 1800 SPP_ARGS(ifp)); 1801 ++ifp->if_ierrors; 1802 break; 1803 } 1804 if (len < 8) { 1805 if (debug) 1806 addlog(SPP_FMT "invalid lcp echo request " 1807 "packet length: %d bytes\n", 1808 SPP_ARGS(ifp), len); 1809 break; 1810 } 1811 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 1812 ntohl (*(long*)(h+1)) == sp->lcp.magic) { 1813 /* Line loopback mode detected. */ 1814 printf(SPP_FMT "loopback\n", SPP_ARGS(ifp)); 1815 sp->pp_loopcnt = MAXALIVECNT * 5; 1816 if_down (ifp); 1817 sppp_qflush (&sp->pp_cpq); 1818 1819 /* Shut down the PPP link. */ 1820 /* XXX */ 1821 lcp.Down(sp); 1822 lcp.Up(sp); 1823 break; 1824 } 1825 *(long*)(h+1) = htonl (sp->lcp.magic); 1826 if (debug) 1827 addlog(SPP_FMT "got lcp echo req, sending echo rep\n", 1828 SPP_ARGS(ifp)); 1829 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1); 1830 break; 1831 case ECHO_REPLY: 1832 if (cp->proto != PPP_LCP) 1833 goto illegal; 1834 if (h->ident != sp->lcp.echoid) { 1835 ++ifp->if_ierrors; 1836 break; 1837 } 1838 if (len < 8) { 1839 if (debug) 1840 addlog(SPP_FMT "lcp invalid echo reply " 1841 "packet length: %d bytes\n", 1842 SPP_ARGS(ifp), len); 1843 break; 1844 } 1845 if (debug) 1846 addlog(SPP_FMT "lcp got echo rep\n", 1847 SPP_ARGS(ifp)); 1848 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) || 1849 ntohl (*(long*)(h+1)) != sp->lcp.magic) 1850 sp->pp_alivecnt = 0; 1851 break; 1852 default: 1853 /* Unknown packet type -- send Code-Reject packet. */ 1854 illegal: 1855 if (debug) 1856 addlog(SPP_FMT "%s send code-rej for 0x%x\n", 1857 SPP_ARGS(ifp), cp->name, h->type); 1858 sppp_cp_send(sp, cp->proto, CODE_REJ, 1859 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1860 ++ifp->if_ierrors; 1861 } 1862 } 1863 1864 1865 /* 1866 * The generic part of all Up/Down/Open/Close/TO event handlers. 1867 * Basically, the state transition handling in the automaton. 1868 */ 1869 static void 1870 sppp_up_event(const struct cp *cp, struct sppp *sp) 1871 { 1872 STDDCL; 1873 1874 if (debug) 1875 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n", 1876 SPP_ARGS(ifp), cp->name, 1877 sppp_state_name(sp->state[cp->protoidx])); 1878 1879 switch (sp->state[cp->protoidx]) { 1880 case STATE_INITIAL: 1881 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1882 break; 1883 case STATE_STARTING: 1884 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1885 (cp->scr)(sp); 1886 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1887 break; 1888 default: 1889 printf(SPP_FMT "%s illegal up in state %s\n", 1890 SPP_ARGS(ifp), cp->name, 1891 sppp_state_name(sp->state[cp->protoidx])); 1892 } 1893 } 1894 1895 static void 1896 sppp_down_event(const struct cp *cp, struct sppp *sp) 1897 { 1898 STDDCL; 1899 1900 if (debug) 1901 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n", 1902 SPP_ARGS(ifp), cp->name, 1903 sppp_state_name(sp->state[cp->protoidx])); 1904 1905 switch (sp->state[cp->protoidx]) { 1906 case STATE_CLOSED: 1907 case STATE_CLOSING: 1908 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1909 break; 1910 case STATE_STOPPED: 1911 sppp_cp_change_state(cp, sp, STATE_STARTING); 1912 (cp->tls)(sp); 1913 break; 1914 case STATE_STOPPING: 1915 case STATE_REQ_SENT: 1916 case STATE_ACK_RCVD: 1917 case STATE_ACK_SENT: 1918 sppp_cp_change_state(cp, sp, STATE_STARTING); 1919 break; 1920 case STATE_OPENED: 1921 (cp->tld)(sp); 1922 sppp_cp_change_state(cp, sp, STATE_STARTING); 1923 break; 1924 default: 1925 printf(SPP_FMT "%s illegal down in state %s\n", 1926 SPP_ARGS(ifp), cp->name, 1927 sppp_state_name(sp->state[cp->protoidx])); 1928 } 1929 } 1930 1931 1932 static void 1933 sppp_open_event(const struct cp *cp, struct sppp *sp) 1934 { 1935 STDDCL; 1936 1937 if (debug) 1938 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n", 1939 SPP_ARGS(ifp), cp->name, 1940 sppp_state_name(sp->state[cp->protoidx])); 1941 1942 switch (sp->state[cp->protoidx]) { 1943 case STATE_INITIAL: 1944 sppp_cp_change_state(cp, sp, STATE_STARTING); 1945 (cp->tls)(sp); 1946 break; 1947 case STATE_STARTING: 1948 break; 1949 case STATE_CLOSED: 1950 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1951 (cp->scr)(sp); 1952 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1953 break; 1954 case STATE_STOPPED: 1955 /* 1956 * Try escaping stopped state. This seems to bite 1957 * people occasionally, in particular for IPCP, 1958 * presumably following previous IPCP negotiation 1959 * aborts. Somehow, we must have missed a Down event 1960 * which would have caused a transition into starting 1961 * state, so as a bandaid we force the Down event now. 1962 * This effectively implements (something like the) 1963 * `restart' option mentioned in the state transition 1964 * table of RFC 1661. 1965 */ 1966 sppp_cp_change_state(cp, sp, STATE_STARTING); 1967 (cp->tls)(sp); 1968 break; 1969 case STATE_STOPPING: 1970 case STATE_REQ_SENT: 1971 case STATE_ACK_RCVD: 1972 case STATE_ACK_SENT: 1973 case STATE_OPENED: 1974 break; 1975 case STATE_CLOSING: 1976 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1977 break; 1978 } 1979 } 1980 1981 1982 static void 1983 sppp_close_event(const struct cp *cp, struct sppp *sp) 1984 { 1985 STDDCL; 1986 1987 if (debug) 1988 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n", 1989 SPP_ARGS(ifp), cp->name, 1990 sppp_state_name(sp->state[cp->protoidx])); 1991 1992 switch (sp->state[cp->protoidx]) { 1993 case STATE_INITIAL: 1994 case STATE_CLOSED: 1995 case STATE_CLOSING: 1996 break; 1997 case STATE_STARTING: 1998 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1999 (cp->tlf)(sp); 2000 break; 2001 case STATE_STOPPED: 2002 sppp_cp_change_state(cp, sp, STATE_CLOSED); 2003 break; 2004 case STATE_STOPPING: 2005 sppp_cp_change_state(cp, sp, STATE_CLOSING); 2006 break; 2007 case STATE_OPENED: 2008 (cp->tld)(sp); 2009 /* fall through */ 2010 case STATE_REQ_SENT: 2011 case STATE_ACK_RCVD: 2012 case STATE_ACK_SENT: 2013 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 2014 sppp_cp_send(sp, cp->proto, TERM_REQ, 2015 ++sp->pp_seq[cp->protoidx], 0, 0); 2016 sppp_cp_change_state(cp, sp, STATE_CLOSING); 2017 break; 2018 } 2019 } 2020 2021 static void 2022 sppp_to_event(const struct cp *cp, struct sppp *sp) 2023 { 2024 STDDCL; 2025 int s; 2026 2027 s = splimp(); 2028 if (debug) 2029 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n", 2030 SPP_ARGS(ifp), cp->name, 2031 sppp_state_name(sp->state[cp->protoidx]), 2032 sp->rst_counter[cp->protoidx]); 2033 2034 if (--sp->rst_counter[cp->protoidx] < 0) 2035 /* TO- event */ 2036 switch (sp->state[cp->protoidx]) { 2037 case STATE_CLOSING: 2038 sppp_cp_change_state(cp, sp, STATE_CLOSED); 2039 (cp->tlf)(sp); 2040 break; 2041 case STATE_STOPPING: 2042 sppp_cp_change_state(cp, sp, STATE_STOPPED); 2043 (cp->tlf)(sp); 2044 break; 2045 case STATE_REQ_SENT: 2046 case STATE_ACK_RCVD: 2047 case STATE_ACK_SENT: 2048 sppp_cp_change_state(cp, sp, STATE_STOPPED); 2049 (cp->tlf)(sp); 2050 break; 2051 } 2052 else 2053 /* TO+ event */ 2054 switch (sp->state[cp->protoidx]) { 2055 case STATE_CLOSING: 2056 case STATE_STOPPING: 2057 sppp_cp_send(sp, cp->proto, TERM_REQ, 2058 ++sp->pp_seq[cp->protoidx], 0, 0); 2059 TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout, 2060 sp->ch[cp->protoidx]); 2061 break; 2062 case STATE_REQ_SENT: 2063 case STATE_ACK_RCVD: 2064 (cp->scr)(sp); 2065 /* sppp_cp_change_state() will restart the timer */ 2066 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2067 break; 2068 case STATE_ACK_SENT: 2069 (cp->scr)(sp); 2070 TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout, 2071 sp->ch[cp->protoidx]); 2072 break; 2073 } 2074 2075 splx(s); 2076 } 2077 2078 /* 2079 * Change the state of a control protocol in the state automaton. 2080 * Takes care of starting/stopping the restart timer. 2081 */ 2082 void 2083 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 2084 { 2085 sp->state[cp->protoidx] = newstate; 2086 2087 UNTIMEOUT(cp->TO, (void *)sp, sp->ch[cp->protoidx]); 2088 switch (newstate) { 2089 case STATE_INITIAL: 2090 case STATE_STARTING: 2091 case STATE_CLOSED: 2092 case STATE_STOPPED: 2093 case STATE_OPENED: 2094 break; 2095 case STATE_CLOSING: 2096 case STATE_STOPPING: 2097 case STATE_REQ_SENT: 2098 case STATE_ACK_RCVD: 2099 case STATE_ACK_SENT: 2100 TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout, 2101 sp->ch[cp->protoidx]); 2102 break; 2103 } 2104 } 2105 2106 /* 2107 *--------------------------------------------------------------------------* 2108 * * 2109 * The LCP implementation. * 2110 * * 2111 *--------------------------------------------------------------------------* 2112 */ 2113 static void 2114 sppp_lcp_init(struct sppp *sp) 2115 { 2116 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2117 sp->lcp.magic = 0; 2118 sp->state[IDX_LCP] = STATE_INITIAL; 2119 sp->fail_counter[IDX_LCP] = 0; 2120 sp->pp_seq[IDX_LCP] = 0; 2121 sp->pp_rseq[IDX_LCP] = 0; 2122 sp->lcp.protos = 0; 2123 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 2124 2125 /* Note that these values are relevant for all control protocols */ 2126 sp->lcp.timeout = 3 * hz; 2127 sp->lcp.max_terminate = 2; 2128 sp->lcp.max_configure = 10; 2129 sp->lcp.max_failure = 10; 2130 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 2131 callout_handle_init(&sp->ch[IDX_LCP]); 2132 #endif 2133 } 2134 2135 static void 2136 sppp_lcp_up(struct sppp *sp) 2137 { 2138 STDDCL; 2139 2140 sp->pp_alivecnt = 0; 2141 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2142 sp->lcp.magic = 0; 2143 sp->lcp.protos = 0; 2144 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 2145 /* 2146 * If this interface is passive or dial-on-demand, and we are 2147 * still in Initial state, it means we've got an incoming 2148 * call. Activate the interface. 2149 */ 2150 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2151 if (debug) 2152 log(LOG_DEBUG, 2153 SPP_FMT "Up event", SPP_ARGS(ifp)); 2154 ifp->if_flags |= IFF_RUNNING; 2155 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2156 if (debug) 2157 addlog("(incoming call)\n"); 2158 sp->pp_flags |= PP_CALLIN; 2159 lcp.Open(sp); 2160 } else if (debug) 2161 addlog("\n"); 2162 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2163 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2164 ifp->if_flags |= IFF_RUNNING; 2165 lcp.Open(sp); 2166 } 2167 2168 sppp_up_event(&lcp, sp); 2169 } 2170 2171 static void 2172 sppp_lcp_down(struct sppp *sp) 2173 { 2174 STDDCL; 2175 2176 sppp_down_event(&lcp, sp); 2177 2178 /* 2179 * If this is neither a dial-on-demand nor a passive 2180 * interface, simulate an ``ifconfig down'' action, so the 2181 * administrator can force a redial by another ``ifconfig 2182 * up''. XXX For leased line operation, should we immediately 2183 * try to reopen the connection here? 2184 */ 2185 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2186 log(LOG_INFO, 2187 SPP_FMT "Down event, taking interface down.\n", 2188 SPP_ARGS(ifp)); 2189 if_down(ifp); 2190 } else { 2191 if (debug) 2192 log(LOG_DEBUG, 2193 SPP_FMT "Down event (carrier loss)\n", 2194 SPP_ARGS(ifp)); 2195 sp->pp_flags &= ~PP_CALLIN; 2196 if (sp->state[IDX_LCP] != STATE_INITIAL) 2197 lcp.Close(sp); 2198 ifp->if_flags &= ~IFF_RUNNING; 2199 } 2200 } 2201 2202 static void 2203 sppp_lcp_open(struct sppp *sp) 2204 { 2205 /* 2206 * If we are authenticator, negotiate LCP_AUTH 2207 */ 2208 if (sp->hisauth.proto != 0) 2209 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2210 else 2211 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2212 sp->pp_flags &= ~PP_NEEDAUTH; 2213 sppp_open_event(&lcp, sp); 2214 } 2215 2216 static void 2217 sppp_lcp_close(struct sppp *sp) 2218 { 2219 sppp_close_event(&lcp, sp); 2220 } 2221 2222 static void 2223 sppp_lcp_TO(void *cookie) 2224 { 2225 sppp_to_event(&lcp, (struct sppp *)cookie); 2226 } 2227 2228 /* 2229 * Analyze a configure request. Return true if it was agreeable, and 2230 * caused action sca, false if it has been rejected or nak'ed, and 2231 * caused action scn. (The return value is used to make the state 2232 * transition decision in the state automaton.) 2233 */ 2234 static int 2235 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2236 { 2237 STDDCL; 2238 u_char *buf, *r, *p; 2239 int origlen, rlen; 2240 u_long nmagic; 2241 u_short authproto; 2242 2243 len -= 4; 2244 origlen = len; 2245 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2246 if (! buf) 2247 return (0); 2248 2249 if (debug) 2250 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ", 2251 SPP_ARGS(ifp)); 2252 2253 /* pass 1: check for things that need to be rejected */ 2254 p = (void*) (h+1); 2255 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2256 if (debug) 2257 addlog(" %s ", sppp_lcp_opt_name(*p)); 2258 switch (*p) { 2259 case LCP_OPT_MAGIC: 2260 /* Magic number. */ 2261 if (len >= 6 && p[1] == 6) 2262 continue; 2263 if (debug) 2264 addlog("[invalid] "); 2265 break; 2266 case LCP_OPT_ASYNC_MAP: 2267 /* Async control character map. */ 2268 if (len >= 6 && p[1] == 6) 2269 continue; 2270 if (debug) 2271 addlog("[invalid] "); 2272 break; 2273 case LCP_OPT_MRU: 2274 /* Maximum receive unit. */ 2275 if (len >= 4 && p[1] == 4) 2276 continue; 2277 if (debug) 2278 addlog("[invalid] "); 2279 break; 2280 case LCP_OPT_AUTH_PROTO: 2281 if (len < 4) { 2282 if (debug) 2283 addlog("[invalid] "); 2284 break; 2285 } 2286 authproto = (p[2] << 8) + p[3]; 2287 if (authproto == PPP_CHAP && p[1] != 5) { 2288 if (debug) 2289 addlog("[invalid chap len] "); 2290 break; 2291 } 2292 if (sp->myauth.proto == 0) { 2293 /* we are not configured to do auth */ 2294 if (debug) 2295 addlog("[not configured] "); 2296 break; 2297 } 2298 /* 2299 * Remote want us to authenticate, remember this, 2300 * so we stay in PHASE_AUTHENTICATE after LCP got 2301 * up. 2302 */ 2303 sp->pp_flags |= PP_NEEDAUTH; 2304 continue; 2305 default: 2306 /* Others not supported. */ 2307 if (debug) 2308 addlog("[rej] "); 2309 break; 2310 } 2311 /* Add the option to rejected list. */ 2312 bcopy (p, r, p[1]); 2313 r += p[1]; 2314 rlen += p[1]; 2315 } 2316 if (rlen) { 2317 if (debug) 2318 addlog(" send conf-rej\n"); 2319 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2320 return 0; 2321 } else if (debug) 2322 addlog("\n"); 2323 2324 /* 2325 * pass 2: check for option values that are unacceptable and 2326 * thus require to be nak'ed. 2327 */ 2328 if (debug) 2329 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ", 2330 SPP_ARGS(ifp)); 2331 2332 p = (void*) (h+1); 2333 len = origlen; 2334 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2335 if (debug) 2336 addlog(" %s ", sppp_lcp_opt_name(*p)); 2337 switch (*p) { 2338 case LCP_OPT_MAGIC: 2339 /* Magic number -- extract. */ 2340 nmagic = (u_long)p[2] << 24 | 2341 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 2342 if (nmagic != sp->lcp.magic) { 2343 sp->pp_loopcnt = 0; 2344 if (debug) 2345 addlog("0x%lx ", nmagic); 2346 continue; 2347 } 2348 if (debug && sp->pp_loopcnt < MAXALIVECNT*5) 2349 addlog("[glitch] "); 2350 ++sp->pp_loopcnt; 2351 /* 2352 * We negate our magic here, and NAK it. If 2353 * we see it later in an NAK packet, we 2354 * suggest a new one. 2355 */ 2356 nmagic = ~sp->lcp.magic; 2357 /* Gonna NAK it. */ 2358 p[2] = nmagic >> 24; 2359 p[3] = nmagic >> 16; 2360 p[4] = nmagic >> 8; 2361 p[5] = nmagic; 2362 break; 2363 2364 case LCP_OPT_ASYNC_MAP: 2365 /* 2366 * Async control character map -- just ignore it. 2367 * 2368 * Quote from RFC 1662, chapter 6: 2369 * To enable this functionality, synchronous PPP 2370 * implementations MUST always respond to the 2371 * Async-Control-Character-Map Configuration 2372 * Option with the LCP Configure-Ack. However, 2373 * acceptance of the Configuration Option does 2374 * not imply that the synchronous implementation 2375 * will do any ACCM mapping. Instead, all such 2376 * octet mapping will be performed by the 2377 * asynchronous-to-synchronous converter. 2378 */ 2379 continue; 2380 2381 case LCP_OPT_MRU: 2382 /* 2383 * Maximum receive unit. Always agreeable, 2384 * but ignored by now. 2385 */ 2386 sp->lcp.their_mru = p[2] * 256 + p[3]; 2387 if (debug) 2388 addlog("%lu ", sp->lcp.their_mru); 2389 continue; 2390 2391 case LCP_OPT_AUTH_PROTO: 2392 authproto = (p[2] << 8) + p[3]; 2393 if (sp->myauth.proto != authproto) { 2394 /* not agreed, nak */ 2395 if (debug) 2396 addlog("[mine %s != his %s] ", 2397 sppp_proto_name(sp->hisauth.proto), 2398 sppp_proto_name(authproto)); 2399 p[2] = sp->myauth.proto >> 8; 2400 p[3] = sp->myauth.proto; 2401 break; 2402 } 2403 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2404 if (debug) 2405 addlog("[chap not MD5] "); 2406 p[4] = CHAP_MD5; 2407 break; 2408 } 2409 continue; 2410 } 2411 /* Add the option to nak'ed list. */ 2412 bcopy (p, r, p[1]); 2413 r += p[1]; 2414 rlen += p[1]; 2415 } 2416 if (rlen) { 2417 /* 2418 * Local and remote magics equal -- loopback? 2419 */ 2420 if (sp->pp_loopcnt >= MAXALIVECNT*5) { 2421 if (sp->pp_loopcnt == MAXALIVECNT*5) 2422 printf (SPP_FMT "loopback\n", 2423 SPP_ARGS(ifp)); 2424 if (ifp->if_flags & IFF_UP) { 2425 if_down(ifp); 2426 sppp_qflush(&sp->pp_cpq); 2427 /* XXX ? */ 2428 lcp.Down(sp); 2429 lcp.Up(sp); 2430 } 2431 } else if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2432 if (debug) 2433 addlog(" max_failure (%d) exceeded, " 2434 "send conf-rej\n", 2435 sp->lcp.max_failure); 2436 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2437 } else { 2438 if (debug) 2439 addlog(" send conf-nak\n"); 2440 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2441 } 2442 } else { 2443 if (debug) 2444 addlog(" send conf-ack\n"); 2445 sp->fail_counter[IDX_LCP] = 0; 2446 sp->pp_loopcnt = 0; 2447 sppp_cp_send (sp, PPP_LCP, CONF_ACK, 2448 h->ident, origlen, h+1); 2449 } 2450 2451 free (buf, M_TEMP); 2452 return (rlen == 0); 2453 } 2454 2455 /* 2456 * Analyze the LCP Configure-Reject option list, and adjust our 2457 * negotiation. 2458 */ 2459 static void 2460 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2461 { 2462 STDDCL; 2463 u_char *buf, *p; 2464 2465 len -= 4; 2466 buf = malloc (len, M_TEMP, M_NOWAIT); 2467 if (!buf) 2468 return; 2469 2470 if (debug) 2471 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ", 2472 SPP_ARGS(ifp)); 2473 2474 p = (void*) (h+1); 2475 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2476 if (debug) 2477 addlog(" %s ", sppp_lcp_opt_name(*p)); 2478 switch (*p) { 2479 case LCP_OPT_MAGIC: 2480 /* Magic number -- can't use it, use 0 */ 2481 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2482 sp->lcp.magic = 0; 2483 break; 2484 case LCP_OPT_MRU: 2485 /* 2486 * Should not be rejected anyway, since we only 2487 * negotiate a MRU if explicitly requested by 2488 * peer. 2489 */ 2490 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2491 break; 2492 case LCP_OPT_AUTH_PROTO: 2493 /* 2494 * Peer doesn't want to authenticate himself, 2495 * deny unless this is a dialout call, and 2496 * AUTHFLAG_NOCALLOUT is set. 2497 */ 2498 if ((sp->pp_flags & PP_CALLIN) == 0 && 2499 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) { 2500 if (debug) 2501 addlog("[don't insist on auth " 2502 "for callout]"); 2503 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2504 break; 2505 } 2506 if (debug) 2507 addlog("[access denied]\n"); 2508 lcp.Close(sp); 2509 break; 2510 } 2511 } 2512 if (debug) 2513 addlog("\n"); 2514 free (buf, M_TEMP); 2515 return; 2516 } 2517 2518 /* 2519 * Analyze the LCP Configure-NAK option list, and adjust our 2520 * negotiation. 2521 */ 2522 static void 2523 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2524 { 2525 STDDCL; 2526 u_char *buf, *p; 2527 u_long magic; 2528 2529 len -= 4; 2530 buf = malloc (len, M_TEMP, M_NOWAIT); 2531 if (!buf) 2532 return; 2533 2534 if (debug) 2535 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ", 2536 SPP_ARGS(ifp)); 2537 2538 p = (void*) (h+1); 2539 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2540 if (debug) 2541 addlog(" %s ", sppp_lcp_opt_name(*p)); 2542 switch (*p) { 2543 case LCP_OPT_MAGIC: 2544 /* Magic number -- renegotiate */ 2545 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2546 len >= 6 && p[1] == 6) { 2547 magic = (u_long)p[2] << 24 | 2548 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 2549 /* 2550 * If the remote magic is our negated one, 2551 * this looks like a loopback problem. 2552 * Suggest a new magic to make sure. 2553 */ 2554 if (magic == ~sp->lcp.magic) { 2555 if (debug) 2556 addlog("magic glitch "); 2557 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 2558 sp->lcp.magic = random(); 2559 #else 2560 sp->lcp.magic = time.tv_sec + time.tv_usec; 2561 #endif 2562 } else { 2563 sp->lcp.magic = magic; 2564 if (debug) 2565 addlog("%lu ", magic); 2566 } 2567 } 2568 break; 2569 case LCP_OPT_MRU: 2570 /* 2571 * Peer wants to advise us to negotiate an MRU. 2572 * Agree on it if it's reasonable, or use 2573 * default otherwise. 2574 */ 2575 if (len >= 4 && p[1] == 4) { 2576 u_int mru = p[2] * 256 + p[3]; 2577 if (debug) 2578 addlog("%d ", mru); 2579 if (mru < PP_MTU || mru > PP_MAX_MRU) 2580 mru = PP_MTU; 2581 sp->lcp.mru = mru; 2582 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2583 } 2584 break; 2585 case LCP_OPT_AUTH_PROTO: 2586 /* 2587 * Peer doesn't like our authentication method, 2588 * deny. 2589 */ 2590 if (debug) 2591 addlog("[access denied]\n"); 2592 lcp.Close(sp); 2593 break; 2594 } 2595 } 2596 if (debug) 2597 addlog("\n"); 2598 free (buf, M_TEMP); 2599 return; 2600 } 2601 2602 static void 2603 sppp_lcp_tlu(struct sppp *sp) 2604 { 2605 STDDCL; 2606 int i; 2607 u_long mask; 2608 2609 /* XXX ? */ 2610 if (! (ifp->if_flags & IFF_UP) && 2611 (ifp->if_flags & IFF_RUNNING)) { 2612 /* Coming out of loopback mode. */ 2613 if_up(ifp); 2614 printf (SPP_FMT "up\n", SPP_ARGS(ifp)); 2615 } 2616 2617 for (i = 0; i < IDX_COUNT; i++) 2618 if ((cps[i])->flags & CP_QUAL) 2619 (cps[i])->Open(sp); 2620 2621 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2622 (sp->pp_flags & PP_NEEDAUTH) != 0) 2623 sp->pp_phase = PHASE_AUTHENTICATE; 2624 else 2625 sp->pp_phase = PHASE_NETWORK; 2626 2627 if (debug) 2628 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2629 sppp_phase_name(sp->pp_phase)); 2630 2631 /* 2632 * Open all authentication protocols. This is even required 2633 * if we already proceeded to network phase, since it might be 2634 * that remote wants us to authenticate, so we might have to 2635 * send a PAP request. Undesired authentication protocols 2636 * don't do anything when they get an Open event. 2637 */ 2638 for (i = 0; i < IDX_COUNT; i++) 2639 if ((cps[i])->flags & CP_AUTH) 2640 (cps[i])->Open(sp); 2641 2642 if (sp->pp_phase == PHASE_NETWORK) { 2643 /* Notify all NCPs. */ 2644 for (i = 0; i < IDX_COUNT; i++) 2645 if (((cps[i])->flags & CP_NCP) && 2646 /* 2647 * XXX 2648 * Hack to administratively disable IPv6 if 2649 * not desired. Perhaps we should have another 2650 * flag for this, but right now, we can make 2651 * all struct cp's read/only. 2652 */ 2653 (cps[i] != &ipv6cp || 2654 (sp->confflags & CONF_ENABLE_IPV6))) 2655 (cps[i])->Open(sp); 2656 } 2657 2658 /* Send Up events to all started protos. */ 2659 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2660 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2661 (cps[i])->Up(sp); 2662 2663 /* notify low-level driver of state change */ 2664 if (sp->pp_chg) 2665 sp->pp_chg(sp, (int)sp->pp_phase); 2666 2667 if (sp->pp_phase == PHASE_NETWORK) 2668 /* if no NCP is starting, close down */ 2669 sppp_lcp_check_and_close(sp); 2670 } 2671 2672 static void 2673 sppp_lcp_tld(struct sppp *sp) 2674 { 2675 STDDCL; 2676 int i; 2677 u_long mask; 2678 2679 sp->pp_phase = PHASE_TERMINATE; 2680 2681 if (debug) 2682 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2683 sppp_phase_name(sp->pp_phase)); 2684 2685 /* 2686 * Take upper layers down. We send the Down event first and 2687 * the Close second to prevent the upper layers from sending 2688 * ``a flurry of terminate-request packets'', as the RFC 2689 * describes it. 2690 */ 2691 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2692 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2693 (cps[i])->Down(sp); 2694 (cps[i])->Close(sp); 2695 } 2696 } 2697 2698 static void 2699 sppp_lcp_tls(struct sppp *sp) 2700 { 2701 STDDCL; 2702 2703 sp->pp_phase = PHASE_ESTABLISH; 2704 2705 if (debug) 2706 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2707 sppp_phase_name(sp->pp_phase)); 2708 2709 /* Notify lower layer if desired. */ 2710 if (sp->pp_tls) 2711 (sp->pp_tls)(sp); 2712 else 2713 (sp->pp_up)(sp); 2714 } 2715 2716 static void 2717 sppp_lcp_tlf(struct sppp *sp) 2718 { 2719 STDDCL; 2720 2721 sp->pp_phase = PHASE_DEAD; 2722 if (debug) 2723 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2724 sppp_phase_name(sp->pp_phase)); 2725 2726 /* Notify lower layer if desired. */ 2727 if (sp->pp_tlf) 2728 (sp->pp_tlf)(sp); 2729 else 2730 (sp->pp_down)(sp); 2731 } 2732 2733 static void 2734 sppp_lcp_scr(struct sppp *sp) 2735 { 2736 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2737 int i = 0; 2738 u_short authproto; 2739 2740 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2741 if (! sp->lcp.magic) 2742 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 2743 sp->lcp.magic = random(); 2744 #else 2745 sp->lcp.magic = time.tv_sec + time.tv_usec; 2746 #endif 2747 opt[i++] = LCP_OPT_MAGIC; 2748 opt[i++] = 6; 2749 opt[i++] = sp->lcp.magic >> 24; 2750 opt[i++] = sp->lcp.magic >> 16; 2751 opt[i++] = sp->lcp.magic >> 8; 2752 opt[i++] = sp->lcp.magic; 2753 } 2754 2755 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2756 opt[i++] = LCP_OPT_MRU; 2757 opt[i++] = 4; 2758 opt[i++] = sp->lcp.mru >> 8; 2759 opt[i++] = sp->lcp.mru; 2760 } 2761 2762 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2763 authproto = sp->hisauth.proto; 2764 opt[i++] = LCP_OPT_AUTH_PROTO; 2765 opt[i++] = authproto == PPP_CHAP? 5: 4; 2766 opt[i++] = authproto >> 8; 2767 opt[i++] = authproto; 2768 if (authproto == PPP_CHAP) 2769 opt[i++] = CHAP_MD5; 2770 } 2771 2772 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2773 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2774 } 2775 2776 /* 2777 * Check the open NCPs, return true if at least one NCP is open. 2778 */ 2779 static int 2780 sppp_ncp_check(struct sppp *sp) 2781 { 2782 int i, mask; 2783 2784 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2785 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2786 return 1; 2787 return 0; 2788 } 2789 2790 /* 2791 * Re-check the open NCPs and see if we should terminate the link. 2792 * Called by the NCPs during their tlf action handling. 2793 */ 2794 static void 2795 sppp_lcp_check_and_close(struct sppp *sp) 2796 { 2797 2798 if (sp->pp_phase < PHASE_NETWORK) 2799 /* don't bother, we are already going down */ 2800 return; 2801 2802 if (sppp_ncp_check(sp)) 2803 return; 2804 2805 lcp.Close(sp); 2806 } 2807 2808 /* 2809 *--------------------------------------------------------------------------* 2810 * * 2811 * The IPCP implementation. * 2812 * * 2813 *--------------------------------------------------------------------------* 2814 */ 2815 2816 static void 2817 sppp_ipcp_init(struct sppp *sp) 2818 { 2819 sp->ipcp.opts = 0; 2820 sp->ipcp.flags = 0; 2821 sp->state[IDX_IPCP] = STATE_INITIAL; 2822 sp->fail_counter[IDX_IPCP] = 0; 2823 sp->pp_seq[IDX_IPCP] = 0; 2824 sp->pp_rseq[IDX_IPCP] = 0; 2825 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 2826 callout_handle_init(&sp->ch[IDX_IPCP]); 2827 #endif 2828 } 2829 2830 static void 2831 sppp_ipcp_up(struct sppp *sp) 2832 { 2833 sppp_up_event(&ipcp, sp); 2834 } 2835 2836 static void 2837 sppp_ipcp_down(struct sppp *sp) 2838 { 2839 sppp_down_event(&ipcp, sp); 2840 } 2841 2842 static void 2843 sppp_ipcp_open(struct sppp *sp) 2844 { 2845 STDDCL; 2846 u_long myaddr, hisaddr; 2847 2848 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN | 2849 IPCP_MYADDR_DYN | IPCP_VJ); 2850 sp->ipcp.opts = 0; 2851 2852 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2853 /* 2854 * If we don't have his address, this probably means our 2855 * interface doesn't want to talk IP at all. (This could 2856 * be the case if somebody wants to speak only IPX, for 2857 * example.) Don't open IPCP in this case. 2858 */ 2859 if (hisaddr == 0L) { 2860 /* XXX this message should go away */ 2861 if (debug) 2862 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n", 2863 SPP_ARGS(ifp)); 2864 return; 2865 } 2866 if (myaddr == 0L) { 2867 /* 2868 * I don't have an assigned address, so i need to 2869 * negotiate my address. 2870 */ 2871 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2872 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2873 } else 2874 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 2875 if (sp->confflags & CONF_ENABLE_VJ) { 2876 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION); 2877 sp->ipcp.max_state = MAX_STATES - 1; 2878 sp->ipcp.compress_cid = 1; 2879 } 2880 sppp_open_event(&ipcp, sp); 2881 } 2882 2883 static void 2884 sppp_ipcp_close(struct sppp *sp) 2885 { 2886 sppp_close_event(&ipcp, sp); 2887 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 2888 /* 2889 * My address was dynamic, clear it again. 2890 */ 2891 sppp_set_ip_addr(sp, 0L); 2892 } 2893 2894 static void 2895 sppp_ipcp_TO(void *cookie) 2896 { 2897 sppp_to_event(&ipcp, (struct sppp *)cookie); 2898 } 2899 2900 /* 2901 * Analyze a configure request. Return true if it was agreeable, and 2902 * caused action sca, false if it has been rejected or nak'ed, and 2903 * caused action scn. (The return value is used to make the state 2904 * transition decision in the state automaton.) 2905 */ 2906 static int 2907 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2908 { 2909 u_char *buf, *r, *p; 2910 struct ifnet *ifp = &sp->pp_if; 2911 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2912 u_long hisaddr, desiredaddr; 2913 int gotmyaddr = 0; 2914 int desiredcomp; 2915 2916 len -= 4; 2917 origlen = len; 2918 /* 2919 * Make sure to allocate a buf that can at least hold a 2920 * conf-nak with an `address' option. We might need it below. 2921 */ 2922 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2923 if (! buf) 2924 return (0); 2925 2926 /* pass 1: see if we can recognize them */ 2927 if (debug) 2928 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ", 2929 SPP_ARGS(ifp)); 2930 p = (void*) (h+1); 2931 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2932 if (debug) 2933 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2934 switch (*p) { 2935 case IPCP_OPT_COMPRESSION: 2936 if (!(sp->confflags & CONF_ENABLE_VJ)) { 2937 /* VJ compression administratively disabled */ 2938 if (debug) 2939 addlog("[locally disabled] "); 2940 break; 2941 } 2942 /* 2943 * In theory, we should only conf-rej an 2944 * option that is shorter than RFC 1618 2945 * requires (i.e. < 4), and should conf-nak 2946 * anything else that is not VJ. However, 2947 * since our algorithm always uses the 2948 * original option to NAK it with new values, 2949 * things would become more complicated. In 2950 * pratice, the only commonly implemented IP 2951 * compression option is VJ anyway, so the 2952 * difference is negligible. 2953 */ 2954 if (len >= 6 && p[1] == 6) { 2955 /* 2956 * correctly formed compression option 2957 * that could be VJ compression 2958 */ 2959 continue; 2960 } 2961 if (debug) 2962 addlog("optlen %d [invalid/unsupported] ", 2963 p[1]); 2964 break; 2965 case IPCP_OPT_ADDRESS: 2966 if (len >= 6 && p[1] == 6) { 2967 /* correctly formed address option */ 2968 continue; 2969 } 2970 if (debug) 2971 addlog("[invalid] "); 2972 break; 2973 default: 2974 /* Others not supported. */ 2975 if (debug) 2976 addlog("[rej] "); 2977 break; 2978 } 2979 /* Add the option to rejected list. */ 2980 bcopy (p, r, p[1]); 2981 r += p[1]; 2982 rlen += p[1]; 2983 } 2984 if (rlen) { 2985 if (debug) 2986 addlog(" send conf-rej\n"); 2987 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2988 return 0; 2989 } else if (debug) 2990 addlog("\n"); 2991 2992 /* pass 2: parse option values */ 2993 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); 2994 if (debug) 2995 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ", 2996 SPP_ARGS(ifp)); 2997 p = (void*) (h+1); 2998 len = origlen; 2999 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3000 if (debug) 3001 addlog(" %s ", sppp_ipcp_opt_name(*p)); 3002 switch (*p) { 3003 case IPCP_OPT_COMPRESSION: 3004 desiredcomp = p[2] << 8 | p[3]; 3005 /* We only support VJ */ 3006 if (desiredcomp == IPCP_COMP_VJ) { 3007 if (debug) 3008 addlog("VJ [ack] "); 3009 sp->ipcp.flags |= IPCP_VJ; 3010 sl_compress_init(sp->pp_comp, p[4]); 3011 sp->ipcp.max_state = p[4]; 3012 sp->ipcp.compress_cid = p[5]; 3013 continue; 3014 } 3015 if (debug) 3016 addlog("compproto %#04x [not supported] ", 3017 desiredcomp); 3018 p[2] = IPCP_COMP_VJ >> 8; 3019 p[3] = IPCP_COMP_VJ; 3020 p[4] = sp->ipcp.max_state; 3021 p[5] = sp->ipcp.compress_cid; 3022 break; 3023 case IPCP_OPT_ADDRESS: 3024 /* This is the address he wants in his end */ 3025 desiredaddr = p[2] << 24 | p[3] << 16 | 3026 p[4] << 8 | p[5]; 3027 if (desiredaddr == hisaddr || 3028 (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) { 3029 /* 3030 * Peer's address is same as our value, 3031 * or we have set it to 0.0.0.* to 3032 * indicate that we do not really care, 3033 * this is agreeable. Gonna conf-ack 3034 * it. 3035 */ 3036 if (debug) 3037 addlog("%s [ack] ", 3038 sppp_dotted_quad(hisaddr)); 3039 /* record that we've seen it already */ 3040 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 3041 continue; 3042 } 3043 /* 3044 * The address wasn't agreeable. This is either 3045 * he sent us 0.0.0.0, asking to assign him an 3046 * address, or he send us another address not 3047 * matching our value. Either case, we gonna 3048 * conf-nak it with our value. 3049 * XXX: we should "rej" if hisaddr == 0 3050 */ 3051 if (debug) { 3052 if (desiredaddr == 0) 3053 addlog("[addr requested] "); 3054 else 3055 addlog("%s [not agreed] ", 3056 sppp_dotted_quad(desiredaddr)); 3057 3058 } 3059 p[2] = hisaddr >> 24; 3060 p[3] = hisaddr >> 16; 3061 p[4] = hisaddr >> 8; 3062 p[5] = hisaddr; 3063 break; 3064 } 3065 /* Add the option to nak'ed list. */ 3066 bcopy (p, r, p[1]); 3067 r += p[1]; 3068 rlen += p[1]; 3069 } 3070 3071 /* 3072 * If we are about to conf-ack the request, but haven't seen 3073 * his address so far, gonna conf-nak it instead, with the 3074 * `address' option present and our idea of his address being 3075 * filled in there, to request negotiation of both addresses. 3076 * 3077 * XXX This can result in an endless req - nak loop if peer 3078 * doesn't want to send us his address. Q: What should we do 3079 * about it? XXX A: implement the max-failure counter. 3080 */ 3081 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) { 3082 buf[0] = IPCP_OPT_ADDRESS; 3083 buf[1] = 6; 3084 buf[2] = hisaddr >> 24; 3085 buf[3] = hisaddr >> 16; 3086 buf[4] = hisaddr >> 8; 3087 buf[5] = hisaddr; 3088 rlen = 6; 3089 if (debug) 3090 addlog("still need hisaddr "); 3091 } 3092 3093 if (rlen) { 3094 if (debug) 3095 addlog(" send conf-nak\n"); 3096 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 3097 } else { 3098 if (debug) 3099 addlog(" send conf-ack\n"); 3100 sppp_cp_send (sp, PPP_IPCP, CONF_ACK, 3101 h->ident, origlen, h+1); 3102 } 3103 3104 free (buf, M_TEMP); 3105 return (rlen == 0); 3106 } 3107 3108 /* 3109 * Analyze the IPCP Configure-Reject option list, and adjust our 3110 * negotiation. 3111 */ 3112 static void 3113 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3114 { 3115 u_char *buf, *p; 3116 struct ifnet *ifp = &sp->pp_if; 3117 int debug = ifp->if_flags & IFF_DEBUG; 3118 3119 len -= 4; 3120 buf = malloc (len, M_TEMP, M_NOWAIT); 3121 if (!buf) 3122 return; 3123 3124 if (debug) 3125 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ", 3126 SPP_ARGS(ifp)); 3127 3128 p = (void*) (h+1); 3129 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3130 if (debug) 3131 addlog(" %s ", sppp_ipcp_opt_name(*p)); 3132 switch (*p) { 3133 case IPCP_OPT_COMPRESSION: 3134 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION); 3135 break; 3136 case IPCP_OPT_ADDRESS: 3137 /* 3138 * Peer doesn't grok address option. This is 3139 * bad. XXX Should we better give up here? 3140 * XXX We could try old "addresses" option... 3141 */ 3142 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3143 break; 3144 } 3145 } 3146 if (debug) 3147 addlog("\n"); 3148 free (buf, M_TEMP); 3149 return; 3150 } 3151 3152 /* 3153 * Analyze the IPCP Configure-NAK option list, and adjust our 3154 * negotiation. 3155 */ 3156 static void 3157 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3158 { 3159 u_char *buf, *p; 3160 struct ifnet *ifp = &sp->pp_if; 3161 int debug = ifp->if_flags & IFF_DEBUG; 3162 int desiredcomp; 3163 u_long wantaddr; 3164 3165 len -= 4; 3166 buf = malloc (len, M_TEMP, M_NOWAIT); 3167 if (!buf) 3168 return; 3169 3170 if (debug) 3171 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ", 3172 SPP_ARGS(ifp)); 3173 3174 p = (void*) (h+1); 3175 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3176 if (debug) 3177 addlog(" %s ", sppp_ipcp_opt_name(*p)); 3178 switch (*p) { 3179 case IPCP_OPT_COMPRESSION: 3180 if (len >= 6 && p[1] == 6) { 3181 desiredcomp = p[2] << 8 | p[3]; 3182 if (debug) 3183 addlog("[wantcomp %#04x] ", 3184 desiredcomp); 3185 if (desiredcomp == IPCP_COMP_VJ) { 3186 sl_compress_init(sp->pp_comp, p[4]); 3187 sp->ipcp.max_state = p[4]; 3188 sp->ipcp.compress_cid = p[5]; 3189 if (debug) 3190 addlog("[agree] "); 3191 } else 3192 sp->ipcp.opts &= 3193 ~(1 << IPCP_OPT_COMPRESSION); 3194 } 3195 break; 3196 case IPCP_OPT_ADDRESS: 3197 /* 3198 * Peer doesn't like our local IP address. See 3199 * if we can do something for him. We'll drop 3200 * him our address then. 3201 */ 3202 if (len >= 6 && p[1] == 6) { 3203 wantaddr = p[2] << 24 | p[3] << 16 | 3204 p[4] << 8 | p[5]; 3205 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3206 if (debug) 3207 addlog("[wantaddr %s] ", 3208 sppp_dotted_quad(wantaddr)); 3209 /* 3210 * When doing dynamic address assignment, 3211 * we accept his offer. Otherwise, we 3212 * ignore it and thus continue to negotiate 3213 * our already existing value. 3214 * XXX: Bogus, if he said no once, he'll 3215 * just say no again, might as well die. 3216 */ 3217 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3218 sppp_set_ip_addr(sp, wantaddr); 3219 if (debug) 3220 addlog("[agree] "); 3221 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3222 } 3223 } 3224 break; 3225 } 3226 } 3227 if (debug) 3228 addlog("\n"); 3229 free (buf, M_TEMP); 3230 return; 3231 } 3232 3233 static void 3234 sppp_ipcp_tlu(struct sppp *sp) 3235 { 3236 /* we are up - notify isdn daemon */ 3237 if (sp->pp_con) 3238 sp->pp_con(sp); 3239 } 3240 3241 static void 3242 sppp_ipcp_tld(struct sppp *sp) 3243 { 3244 } 3245 3246 static void 3247 sppp_ipcp_tls(struct sppp *sp) 3248 { 3249 /* indicate to LCP that it must stay alive */ 3250 sp->lcp.protos |= (1 << IDX_IPCP); 3251 } 3252 3253 static void 3254 sppp_ipcp_tlf(struct sppp *sp) 3255 { 3256 /* we no longer need LCP */ 3257 sp->lcp.protos &= ~(1 << IDX_IPCP); 3258 sppp_lcp_check_and_close(sp); 3259 } 3260 3261 static void 3262 sppp_ipcp_scr(struct sppp *sp) 3263 { 3264 char opt[6 /* compression */ + 6 /* address */]; 3265 u_long ouraddr; 3266 int i = 0; 3267 3268 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3269 opt[i++] = IPCP_OPT_COMPRESSION; 3270 opt[i++] = 6; 3271 opt[i++] = IPCP_COMP_VJ >> 8; 3272 opt[i++] = IPCP_COMP_VJ; 3273 opt[i++] = sp->ipcp.max_state; 3274 opt[i++] = sp->ipcp.compress_cid; 3275 } 3276 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3277 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3278 opt[i++] = IPCP_OPT_ADDRESS; 3279 opt[i++] = 6; 3280 opt[i++] = ouraddr >> 24; 3281 opt[i++] = ouraddr >> 16; 3282 opt[i++] = ouraddr >> 8; 3283 opt[i++] = ouraddr; 3284 } 3285 3286 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3287 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3288 } 3289 3290 /* 3291 *--------------------------------------------------------------------------* 3292 * * 3293 * The IPv6CP implementation. * 3294 * * 3295 *--------------------------------------------------------------------------* 3296 */ 3297 3298 #ifdef INET6 3299 static void 3300 sppp_ipv6cp_init(struct sppp *sp) 3301 { 3302 sp->ipv6cp.opts = 0; 3303 sp->ipv6cp.flags = 0; 3304 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3305 sp->fail_counter[IDX_IPV6CP] = 0; 3306 sp->pp_seq[IDX_IPV6CP] = 0; 3307 sp->pp_rseq[IDX_IPV6CP] = 0; 3308 #if defined(__NetBSD__) 3309 callout_init(&sp->ch[IDX_IPV6CP]); 3310 #endif 3311 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 3312 callout_handle_init(&sp->ch[IDX_IPV6CP]); 3313 #endif 3314 } 3315 3316 static void 3317 sppp_ipv6cp_up(struct sppp *sp) 3318 { 3319 sppp_up_event(&ipv6cp, sp); 3320 } 3321 3322 static void 3323 sppp_ipv6cp_down(struct sppp *sp) 3324 { 3325 sppp_down_event(&ipv6cp, sp); 3326 } 3327 3328 static void 3329 sppp_ipv6cp_open(struct sppp *sp) 3330 { 3331 STDDCL; 3332 struct in6_addr myaddr, hisaddr; 3333 3334 #ifdef IPV6CP_MYIFID_DYN 3335 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3336 #else 3337 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3338 #endif 3339 3340 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3341 /* 3342 * If we don't have our address, this probably means our 3343 * interface doesn't want to talk IPv6 at all. (This could 3344 * be the case if somebody wants to speak only IPX, for 3345 * example.) Don't open IPv6CP in this case. 3346 */ 3347 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3348 /* XXX this message should go away */ 3349 if (debug) 3350 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n", 3351 SPP_ARGS(ifp)); 3352 return; 3353 } 3354 3355 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3356 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3357 sppp_open_event(&ipv6cp, sp); 3358 } 3359 3360 static void 3361 sppp_ipv6cp_close(struct sppp *sp) 3362 { 3363 sppp_close_event(&ipv6cp, sp); 3364 } 3365 3366 static void 3367 sppp_ipv6cp_TO(void *cookie) 3368 { 3369 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3370 } 3371 3372 /* 3373 * Analyze a configure request. Return true if it was agreeable, and 3374 * caused action sca, false if it has been rejected or nak'ed, and 3375 * caused action scn. (The return value is used to make the state 3376 * transition decision in the state automaton.) 3377 */ 3378 static int 3379 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3380 { 3381 u_char *buf, *r, *p; 3382 struct ifnet *ifp = &sp->pp_if; 3383 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3384 struct in6_addr myaddr, desiredaddr, suggestaddr; 3385 int ifidcount; 3386 int type; 3387 int collision, nohisaddr; 3388 3389 len -= 4; 3390 origlen = len; 3391 /* 3392 * Make sure to allocate a buf that can at least hold a 3393 * conf-nak with an `address' option. We might need it below. 3394 */ 3395 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3396 if (! buf) 3397 return (0); 3398 3399 /* pass 1: see if we can recognize them */ 3400 if (debug) 3401 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:", 3402 SPP_ARGS(ifp)); 3403 p = (void*) (h+1); 3404 ifidcount = 0; 3405 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3406 if (debug) 3407 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3408 switch (*p) { 3409 case IPV6CP_OPT_IFID: 3410 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3411 /* correctly formed address option */ 3412 ifidcount++; 3413 continue; 3414 } 3415 if (debug) 3416 addlog(" [invalid]"); 3417 break; 3418 #ifdef notyet 3419 case IPV6CP_OPT_COMPRESSION: 3420 if (len >= 4 && p[1] >= 4) { 3421 /* correctly formed compress option */ 3422 continue; 3423 } 3424 if (debug) 3425 addlog(" [invalid]"); 3426 break; 3427 #endif 3428 default: 3429 /* Others not supported. */ 3430 if (debug) 3431 addlog(" [rej]"); 3432 break; 3433 } 3434 /* Add the option to rejected list. */ 3435 bcopy (p, r, p[1]); 3436 r += p[1]; 3437 rlen += p[1]; 3438 } 3439 if (rlen) { 3440 if (debug) 3441 addlog(" send conf-rej\n"); 3442 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3443 goto end; 3444 } else if (debug) 3445 addlog("\n"); 3446 3447 /* pass 2: parse option values */ 3448 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3449 if (debug) 3450 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ", 3451 SPP_ARGS(ifp)); 3452 p = (void*) (h+1); 3453 len = origlen; 3454 type = CONF_ACK; 3455 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3456 if (debug) 3457 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3458 switch (*p) { 3459 #ifdef notyet 3460 case IPV6CP_OPT_COMPRESSION: 3461 continue; 3462 #endif 3463 case IPV6CP_OPT_IFID: 3464 bzero(&desiredaddr, sizeof(desiredaddr)); 3465 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3466 collision = (bcmp(&desiredaddr.s6_addr[8], 3467 &myaddr.s6_addr[8], 8) == 0); 3468 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3469 3470 desiredaddr.s6_addr16[0] = htons(0xfe80); 3471 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3472 3473 if (!collision && !nohisaddr) { 3474 /* no collision, hisaddr known - Conf-Ack */ 3475 type = CONF_ACK; 3476 3477 if (debug) { 3478 addlog(" %s [%s]", 3479 ip6_sprintf(&desiredaddr), 3480 sppp_cp_type_name(type)); 3481 } 3482 continue; 3483 } 3484 3485 bzero(&suggestaddr, sizeof(&suggestaddr)); 3486 if (collision && nohisaddr) { 3487 /* collision, hisaddr unknown - Conf-Rej */ 3488 type = CONF_REJ; 3489 bzero(&p[2], 8); 3490 } else { 3491 /* 3492 * - no collision, hisaddr unknown, or 3493 * - collision, hisaddr known 3494 * Conf-Nak, suggest hisaddr 3495 */ 3496 type = CONF_NAK; 3497 sppp_suggest_ip6_addr(sp, &suggestaddr); 3498 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3499 } 3500 if (debug) 3501 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3502 sppp_cp_type_name(type)); 3503 break; 3504 } 3505 /* Add the option to nak'ed list. */ 3506 bcopy (p, r, p[1]); 3507 r += p[1]; 3508 rlen += p[1]; 3509 } 3510 3511 if (rlen == 0 && type == CONF_ACK) { 3512 if (debug) 3513 addlog(" send %s\n", sppp_cp_type_name(type)); 3514 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1); 3515 } else { 3516 #ifdef DIAGNOSTIC 3517 if (type == CONF_ACK) 3518 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3519 #endif 3520 3521 if (debug) { 3522 addlog(" send %s suggest %s\n", 3523 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3524 } 3525 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3526 } 3527 3528 end: 3529 free (buf, M_TEMP); 3530 return (rlen == 0); 3531 } 3532 3533 /* 3534 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3535 * negotiation. 3536 */ 3537 static void 3538 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3539 { 3540 u_char *buf, *p; 3541 struct ifnet *ifp = &sp->pp_if; 3542 int debug = ifp->if_flags & IFF_DEBUG; 3543 3544 len -= 4; 3545 buf = malloc (len, M_TEMP, M_NOWAIT); 3546 if (!buf) 3547 return; 3548 3549 if (debug) 3550 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:", 3551 SPP_ARGS(ifp)); 3552 3553 p = (void*) (h+1); 3554 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3555 if (debug) 3556 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3557 switch (*p) { 3558 case IPV6CP_OPT_IFID: 3559 /* 3560 * Peer doesn't grok address option. This is 3561 * bad. XXX Should we better give up here? 3562 */ 3563 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3564 break; 3565 #ifdef notyet 3566 case IPV6CP_OPT_COMPRESS: 3567 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3568 break; 3569 #endif 3570 } 3571 } 3572 if (debug) 3573 addlog("\n"); 3574 free (buf, M_TEMP); 3575 return; 3576 } 3577 3578 /* 3579 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3580 * negotiation. 3581 */ 3582 static void 3583 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3584 { 3585 u_char *buf, *p; 3586 struct ifnet *ifp = &sp->pp_if; 3587 int debug = ifp->if_flags & IFF_DEBUG; 3588 struct in6_addr suggestaddr; 3589 3590 len -= 4; 3591 buf = malloc (len, M_TEMP, M_NOWAIT); 3592 if (!buf) 3593 return; 3594 3595 if (debug) 3596 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:", 3597 SPP_ARGS(ifp)); 3598 3599 p = (void*) (h+1); 3600 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3601 if (debug) 3602 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3603 switch (*p) { 3604 case IPV6CP_OPT_IFID: 3605 /* 3606 * Peer doesn't like our local ifid. See 3607 * if we can do something for him. We'll drop 3608 * him our address then. 3609 */ 3610 if (len < 10 || p[1] != 10) 3611 break; 3612 bzero(&suggestaddr, sizeof(suggestaddr)); 3613 suggestaddr.s6_addr16[0] = htons(0xfe80); 3614 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3615 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3616 3617 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3618 if (debug) 3619 addlog(" [suggestaddr %s]", 3620 ip6_sprintf(&suggestaddr)); 3621 #ifdef IPV6CP_MYIFID_DYN 3622 /* 3623 * When doing dynamic address assignment, 3624 * we accept his offer. 3625 */ 3626 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3627 struct in6_addr lastsuggest; 3628 /* 3629 * If <suggested myaddr from peer> equals to 3630 * <hisaddr we have suggested last time>, 3631 * we have a collision. generate new random 3632 * ifid. 3633 */ 3634 sppp_suggest_ip6_addr(&lastsuggest); 3635 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3636 lastsuggest)) { 3637 if (debug) 3638 addlog(" [random]"); 3639 sppp_gen_ip6_addr(sp, &suggestaddr); 3640 } 3641 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3642 if (debug) 3643 addlog(" [agree]"); 3644 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3645 } 3646 #else 3647 /* 3648 * Since we do not do dynamic address assignment, 3649 * we ignore it and thus continue to negotiate 3650 * our already existing value. This can possibly 3651 * go into infinite request-reject loop. 3652 * 3653 * This is not likely because we normally use 3654 * ifid based on MAC-address. 3655 * If you have no ethernet card on the node, too bad. 3656 * XXX should we use fail_counter? 3657 */ 3658 #endif 3659 break; 3660 #ifdef notyet 3661 case IPV6CP_OPT_COMPRESS: 3662 /* 3663 * Peer wants different compression parameters. 3664 */ 3665 break; 3666 #endif 3667 } 3668 } 3669 if (debug) 3670 addlog("\n"); 3671 free (buf, M_TEMP); 3672 return; 3673 } 3674 static void 3675 sppp_ipv6cp_tlu(struct sppp *sp) 3676 { 3677 /* we are up - notify isdn daemon */ 3678 if (sp->pp_con) 3679 sp->pp_con(sp); 3680 } 3681 3682 static void 3683 sppp_ipv6cp_tld(struct sppp *sp) 3684 { 3685 } 3686 3687 static void 3688 sppp_ipv6cp_tls(struct sppp *sp) 3689 { 3690 /* indicate to LCP that it must stay alive */ 3691 sp->lcp.protos |= (1 << IDX_IPV6CP); 3692 } 3693 3694 static void 3695 sppp_ipv6cp_tlf(struct sppp *sp) 3696 { 3697 3698 #if 0 /* need #if 0 to close IPv6CP properly */ 3699 /* we no longer need LCP */ 3700 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3701 sppp_lcp_check_and_close(sp); 3702 #endif 3703 } 3704 3705 static void 3706 sppp_ipv6cp_scr(struct sppp *sp) 3707 { 3708 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3709 struct in6_addr ouraddr; 3710 int i = 0; 3711 3712 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3713 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3714 opt[i++] = IPV6CP_OPT_IFID; 3715 opt[i++] = 10; 3716 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3717 i += 8; 3718 } 3719 3720 #ifdef notyet 3721 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3722 opt[i++] = IPV6CP_OPT_COMPRESSION; 3723 opt[i++] = 4; 3724 opt[i++] = 0; /* TBD */ 3725 opt[i++] = 0; /* TBD */ 3726 /* variable length data may follow */ 3727 } 3728 #endif 3729 3730 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3731 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3732 } 3733 #else /*INET6*/ 3734 static void sppp_ipv6cp_init(struct sppp *sp) 3735 { 3736 } 3737 3738 static void sppp_ipv6cp_up(struct sppp *sp) 3739 { 3740 } 3741 3742 static void sppp_ipv6cp_down(struct sppp *sp) 3743 { 3744 } 3745 3746 3747 static void sppp_ipv6cp_open(struct sppp *sp) 3748 { 3749 } 3750 3751 static void sppp_ipv6cp_close(struct sppp *sp) 3752 { 3753 } 3754 3755 static void sppp_ipv6cp_TO(void *sp) 3756 { 3757 } 3758 3759 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3760 { 3761 return 0; 3762 } 3763 3764 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3765 { 3766 } 3767 3768 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3769 { 3770 } 3771 3772 static void sppp_ipv6cp_tlu(struct sppp *sp) 3773 { 3774 } 3775 3776 static void sppp_ipv6cp_tld(struct sppp *sp) 3777 { 3778 } 3779 3780 static void sppp_ipv6cp_tls(struct sppp *sp) 3781 { 3782 } 3783 3784 static void sppp_ipv6cp_tlf(struct sppp *sp) 3785 { 3786 } 3787 3788 static void sppp_ipv6cp_scr(struct sppp *sp) 3789 { 3790 } 3791 #endif /*INET6*/ 3792 3793 /* 3794 *--------------------------------------------------------------------------* 3795 * * 3796 * The CHAP implementation. * 3797 * * 3798 *--------------------------------------------------------------------------* 3799 */ 3800 3801 /* 3802 * The authentication protocols don't employ a full-fledged state machine as 3803 * the control protocols do, since they do have Open and Close events, but 3804 * not Up and Down, nor are they explicitly terminated. Also, use of the 3805 * authentication protocols may be different in both directions (this makes 3806 * sense, think of a machine that never accepts incoming calls but only 3807 * calls out, it doesn't require the called party to authenticate itself). 3808 * 3809 * Our state machine for the local authentication protocol (we are requesting 3810 * the peer to authenticate) looks like: 3811 * 3812 * RCA- 3813 * +--------------------------------------------+ 3814 * V scn,tld| 3815 * +--------+ Close +---------+ RCA+ 3816 * | |<----------------------------------| |------+ 3817 * +--->| Closed | TO* | Opened | sca | 3818 * | | |-----+ +-------| |<-----+ 3819 * | +--------+ irc | | +---------+ 3820 * | ^ | | ^ 3821 * | | | | | 3822 * | | | | | 3823 * | TO-| | | | 3824 * | |tld TO+ V | | 3825 * | | +------->+ | | 3826 * | | | | | | 3827 * | +--------+ V | | 3828 * | | |<----+<--------------------+ | 3829 * | | Req- | scr | 3830 * | | Sent | | 3831 * | | | | 3832 * | +--------+ | 3833 * | RCA- | | RCA+ | 3834 * +------+ +------------------------------------------+ 3835 * scn,tld sca,irc,ict,tlu 3836 * 3837 * 3838 * with: 3839 * 3840 * Open: LCP reached authentication phase 3841 * Close: LCP reached terminate phase 3842 * 3843 * RCA+: received reply (pap-req, chap-response), acceptable 3844 * RCN: received reply (pap-req, chap-response), not acceptable 3845 * TO+: timeout with restart counter >= 0 3846 * TO-: timeout with restart counter < 0 3847 * TO*: reschedule timeout for CHAP 3848 * 3849 * scr: send request packet (none for PAP, chap-challenge) 3850 * sca: send ack packet (pap-ack, chap-success) 3851 * scn: send nak packet (pap-nak, chap-failure) 3852 * ict: initialize re-challenge timer (CHAP only) 3853 * 3854 * tlu: this-layer-up, LCP reaches network phase 3855 * tld: this-layer-down, LCP enters terminate phase 3856 * 3857 * Note that in CHAP mode, after sending a new challenge, while the state 3858 * automaton falls back into Req-Sent state, it doesn't signal a tld 3859 * event to LCP, so LCP remains in network phase. Only after not getting 3860 * any response (or after getting an unacceptable response), CHAP closes, 3861 * causing LCP to enter terminate phase. 3862 * 3863 * With PAP, there is no initial request that can be sent. The peer is 3864 * expected to send one based on the successful negotiation of PAP as 3865 * the authentication protocol during the LCP option negotiation. 3866 * 3867 * Incoming authentication protocol requests (remote requests 3868 * authentication, we are peer) don't employ a state machine at all, 3869 * they are simply answered. Some peers [Ascend P50 firmware rev 3870 * 4.50] react allergically when sending IPCP requests while they are 3871 * still in authentication phase (thereby violating the standard that 3872 * demands that these NCP packets are to be discarded), so we keep 3873 * track of the peer demanding us to authenticate, and only proceed to 3874 * phase network once we've seen a positive acknowledge for the 3875 * authentication. 3876 */ 3877 3878 /* 3879 * Handle incoming CHAP packets. 3880 */ 3881 void 3882 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3883 { 3884 STDDCL; 3885 struct lcp_header *h; 3886 int len, x; 3887 u_char *value, *name, digest[AUTHKEYLEN], dsize; 3888 int value_len, name_len; 3889 MD5_CTX ctx; 3890 3891 len = m->m_pkthdr.len; 3892 if (len < 4) { 3893 if (debug) 3894 log(LOG_DEBUG, 3895 SPP_FMT "chap invalid packet length: %d bytes\n", 3896 SPP_ARGS(ifp), len); 3897 return; 3898 } 3899 h = mtod (m, struct lcp_header*); 3900 if (len > ntohs (h->len)) 3901 len = ntohs (h->len); 3902 3903 switch (h->type) { 3904 /* challenge, failure and success are his authproto */ 3905 case CHAP_CHALLENGE: 3906 value = 1 + (u_char*)(h+1); 3907 value_len = value[-1]; 3908 name = value + value_len; 3909 name_len = len - value_len - 5; 3910 if (name_len < 0) { 3911 if (debug) { 3912 log(LOG_DEBUG, 3913 SPP_FMT "chap corrupted challenge " 3914 "<%s id=0x%x len=%d", 3915 SPP_ARGS(ifp), 3916 sppp_auth_type_name(PPP_CHAP, h->type), 3917 h->ident, ntohs(h->len)); 3918 sppp_print_bytes((u_char*) (h+1), len-4); 3919 addlog(">\n"); 3920 } 3921 break; 3922 } 3923 3924 if (debug) { 3925 log(LOG_DEBUG, 3926 SPP_FMT "chap input <%s id=0x%x len=%d name=", 3927 SPP_ARGS(ifp), 3928 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3929 ntohs(h->len)); 3930 sppp_print_string((char*) name, name_len); 3931 addlog(" value-size=%d value=", value_len); 3932 sppp_print_bytes(value, value_len); 3933 addlog(">\n"); 3934 } 3935 3936 /* Compute reply value. */ 3937 MD5Init(&ctx); 3938 MD5Update(&ctx, &h->ident, 1); 3939 MD5Update(&ctx, sp->myauth.secret, 3940 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN)); 3941 MD5Update(&ctx, value, value_len); 3942 MD5Final(digest, &ctx); 3943 dsize = sizeof digest; 3944 3945 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3946 sizeof dsize, (const char *)&dsize, 3947 sizeof digest, digest, 3948 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 3949 sp->myauth.name, 3950 0); 3951 break; 3952 3953 case CHAP_SUCCESS: 3954 if (debug) { 3955 log(LOG_DEBUG, SPP_FMT "chap success", 3956 SPP_ARGS(ifp)); 3957 if (len > 4) { 3958 addlog(": "); 3959 sppp_print_string((char*)(h + 1), len - 4); 3960 } 3961 addlog("\n"); 3962 } 3963 x = splimp(); 3964 sp->pp_flags &= ~PP_NEEDAUTH; 3965 if (sp->myauth.proto == PPP_CHAP && 3966 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3967 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3968 /* 3969 * We are authenticator for CHAP but didn't 3970 * complete yet. Leave it to tlu to proceed 3971 * to network phase. 3972 */ 3973 splx(x); 3974 break; 3975 } 3976 splx(x); 3977 sppp_phase_network(sp); 3978 break; 3979 3980 case CHAP_FAILURE: 3981 if (debug) { 3982 log(LOG_INFO, SPP_FMT "chap failure", 3983 SPP_ARGS(ifp)); 3984 if (len > 4) { 3985 addlog(": "); 3986 sppp_print_string((char*)(h + 1), len - 4); 3987 } 3988 addlog("\n"); 3989 } else 3990 log(LOG_INFO, SPP_FMT "chap failure\n", 3991 SPP_ARGS(ifp)); 3992 /* await LCP shutdown by authenticator */ 3993 break; 3994 3995 /* response is my authproto */ 3996 case CHAP_RESPONSE: 3997 value = 1 + (u_char*)(h+1); 3998 value_len = value[-1]; 3999 name = value + value_len; 4000 name_len = len - value_len - 5; 4001 if (name_len < 0) { 4002 if (debug) { 4003 log(LOG_DEBUG, 4004 SPP_FMT "chap corrupted response " 4005 "<%s id=0x%x len=%d", 4006 SPP_ARGS(ifp), 4007 sppp_auth_type_name(PPP_CHAP, h->type), 4008 h->ident, ntohs(h->len)); 4009 sppp_print_bytes((u_char*)(h+1), len-4); 4010 addlog(">\n"); 4011 } 4012 break; 4013 } 4014 if (h->ident != sp->confid[IDX_CHAP]) { 4015 if (debug) 4016 log(LOG_DEBUG, 4017 SPP_FMT "chap dropping response for old ID " 4018 "(got %d, expected %d)\n", 4019 SPP_ARGS(ifp), 4020 h->ident, sp->confid[IDX_CHAP]); 4021 break; 4022 } 4023 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) 4024 || bcmp(name, sp->hisauth.name, name_len) != 0) { 4025 log(LOG_INFO, SPP_FMT "chap response, his name ", 4026 SPP_ARGS(ifp)); 4027 sppp_print_string(name, name_len); 4028 addlog(" != expected "); 4029 sppp_print_string(sp->hisauth.name, 4030 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)); 4031 addlog("\n"); 4032 } 4033 if (debug) { 4034 log(LOG_DEBUG, SPP_FMT "chap input(%s) " 4035 "<%s id=0x%x len=%d name=", 4036 SPP_ARGS(ifp), 4037 sppp_state_name(sp->state[IDX_CHAP]), 4038 sppp_auth_type_name(PPP_CHAP, h->type), 4039 h->ident, ntohs (h->len)); 4040 sppp_print_string((char*)name, name_len); 4041 addlog(" value-size=%d value=", value_len); 4042 sppp_print_bytes(value, value_len); 4043 addlog(">\n"); 4044 } 4045 if (value_len != AUTHKEYLEN) { 4046 if (debug) 4047 log(LOG_DEBUG, 4048 SPP_FMT "chap bad hash value length: " 4049 "%d bytes, should be %d\n", 4050 SPP_ARGS(ifp), value_len, 4051 AUTHKEYLEN); 4052 break; 4053 } 4054 4055 MD5Init(&ctx); 4056 MD5Update(&ctx, &h->ident, 1); 4057 MD5Update(&ctx, sp->hisauth.secret, 4058 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN)); 4059 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN); 4060 MD5Final(digest, &ctx); 4061 4062 #define FAILMSG "Failed..." 4063 #define SUCCMSG "Welcome!" 4064 4065 if (value_len != sizeof digest || 4066 bcmp(digest, value, value_len) != 0) { 4067 /* action scn, tld */ 4068 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4069 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4070 0); 4071 chap.tld(sp); 4072 break; 4073 } 4074 /* action sca, perhaps tlu */ 4075 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4076 sp->state[IDX_CHAP] == STATE_OPENED) 4077 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4078 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4079 0); 4080 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4081 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4082 chap.tlu(sp); 4083 } 4084 break; 4085 4086 default: 4087 /* Unknown CHAP packet type -- ignore. */ 4088 if (debug) { 4089 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) " 4090 "<0x%x id=0x%xh len=%d", 4091 SPP_ARGS(ifp), 4092 sppp_state_name(sp->state[IDX_CHAP]), 4093 h->type, h->ident, ntohs(h->len)); 4094 sppp_print_bytes((u_char*)(h+1), len-4); 4095 addlog(">\n"); 4096 } 4097 break; 4098 4099 } 4100 } 4101 4102 static void 4103 sppp_chap_init(struct sppp *sp) 4104 { 4105 /* Chap doesn't have STATE_INITIAL at all. */ 4106 sp->state[IDX_CHAP] = STATE_CLOSED; 4107 sp->fail_counter[IDX_CHAP] = 0; 4108 sp->pp_seq[IDX_CHAP] = 0; 4109 sp->pp_rseq[IDX_CHAP] = 0; 4110 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 4111 callout_handle_init(&sp->ch[IDX_CHAP]); 4112 #endif 4113 } 4114 4115 static void 4116 sppp_chap_open(struct sppp *sp) 4117 { 4118 if (sp->myauth.proto == PPP_CHAP && 4119 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4120 /* we are authenticator for CHAP, start it */ 4121 chap.scr(sp); 4122 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4123 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4124 } 4125 /* nothing to be done if we are peer, await a challenge */ 4126 } 4127 4128 static void 4129 sppp_chap_close(struct sppp *sp) 4130 { 4131 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4132 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4133 } 4134 4135 static void 4136 sppp_chap_TO(void *cookie) 4137 { 4138 struct sppp *sp = (struct sppp *)cookie; 4139 STDDCL; 4140 int s; 4141 4142 s = splimp(); 4143 if (debug) 4144 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n", 4145 SPP_ARGS(ifp), 4146 sppp_state_name(sp->state[IDX_CHAP]), 4147 sp->rst_counter[IDX_CHAP]); 4148 4149 if (--sp->rst_counter[IDX_CHAP] < 0) 4150 /* TO- event */ 4151 switch (sp->state[IDX_CHAP]) { 4152 case STATE_REQ_SENT: 4153 chap.tld(sp); 4154 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4155 break; 4156 } 4157 else 4158 /* TO+ (or TO*) event */ 4159 switch (sp->state[IDX_CHAP]) { 4160 case STATE_OPENED: 4161 /* TO* event */ 4162 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4163 /* fall through */ 4164 case STATE_REQ_SENT: 4165 chap.scr(sp); 4166 /* sppp_cp_change_state() will restart the timer */ 4167 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4168 break; 4169 } 4170 4171 splx(s); 4172 } 4173 4174 static void 4175 sppp_chap_tlu(struct sppp *sp) 4176 { 4177 STDDCL; 4178 int i, x; 4179 4180 i = 0; 4181 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4182 4183 /* 4184 * Some broken CHAP implementations (Conware CoNet, firmware 4185 * 4.0.?) don't want to re-authenticate their CHAP once the 4186 * initial challenge-response exchange has taken place. 4187 * Provide for an option to avoid rechallenges. 4188 */ 4189 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) { 4190 /* 4191 * Compute the re-challenge timeout. This will yield 4192 * a number between 300 and 810 seconds. 4193 */ 4194 i = 300 + ((unsigned)(random() & 0xff00) >> 7); 4195 TIMEOUT(chap.TO, (void *)sp, i * hz, sp->ch[IDX_CHAP]); 4196 } 4197 4198 if (debug) { 4199 log(LOG_DEBUG, 4200 SPP_FMT "chap %s, ", 4201 SPP_ARGS(ifp), 4202 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu"); 4203 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) 4204 addlog("next re-challenge in %d seconds\n", i); 4205 else 4206 addlog("re-challenging supressed\n"); 4207 } 4208 4209 x = splimp(); 4210 /* indicate to LCP that we need to be closed down */ 4211 sp->lcp.protos |= (1 << IDX_CHAP); 4212 4213 if (sp->pp_flags & PP_NEEDAUTH) { 4214 /* 4215 * Remote is authenticator, but his auth proto didn't 4216 * complete yet. Defer the transition to network 4217 * phase. 4218 */ 4219 splx(x); 4220 return; 4221 } 4222 splx(x); 4223 4224 /* 4225 * If we are already in phase network, we are done here. This 4226 * is the case if this is a dummy tlu event after a re-challenge. 4227 */ 4228 if (sp->pp_phase != PHASE_NETWORK) 4229 sppp_phase_network(sp); 4230 } 4231 4232 static void 4233 sppp_chap_tld(struct sppp *sp) 4234 { 4235 STDDCL; 4236 4237 if (debug) 4238 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp)); 4239 UNTIMEOUT(chap.TO, (void *)sp, sp->ch[IDX_CHAP]); 4240 sp->lcp.protos &= ~(1 << IDX_CHAP); 4241 4242 lcp.Close(sp); 4243 } 4244 4245 static void 4246 sppp_chap_scr(struct sppp *sp) 4247 { 4248 u_long *ch, seed; 4249 u_char clen; 4250 4251 /* Compute random challenge. */ 4252 ch = (u_long *)sp->myauth.challenge; 4253 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 4254 read_random(&seed, sizeof seed); 4255 #else 4256 { 4257 struct timeval tv; 4258 microtime(&tv); 4259 seed = tv.tv_sec ^ tv.tv_usec; 4260 } 4261 #endif 4262 ch[0] = seed ^ random(); 4263 ch[1] = seed ^ random(); 4264 ch[2] = seed ^ random(); 4265 ch[3] = seed ^ random(); 4266 clen = AUTHKEYLEN; 4267 4268 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4269 4270 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4271 sizeof clen, (const char *)&clen, 4272 (size_t)AUTHKEYLEN, sp->myauth.challenge, 4273 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 4274 sp->myauth.name, 4275 0); 4276 } 4277 4278 /* 4279 *--------------------------------------------------------------------------* 4280 * * 4281 * The PAP implementation. * 4282 * * 4283 *--------------------------------------------------------------------------* 4284 */ 4285 /* 4286 * For PAP, we need to keep a little state also if we are the peer, not the 4287 * authenticator. This is since we don't get a request to authenticate, but 4288 * have to repeatedly authenticate ourself until we got a response (or the 4289 * retry counter is expired). 4290 */ 4291 4292 /* 4293 * Handle incoming PAP packets. */ 4294 static void 4295 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4296 { 4297 STDDCL; 4298 struct lcp_header *h; 4299 int len, x; 4300 u_char *name, *passwd, mlen; 4301 int name_len, passwd_len; 4302 4303 len = m->m_pkthdr.len; 4304 if (len < 5) { 4305 if (debug) 4306 log(LOG_DEBUG, 4307 SPP_FMT "pap invalid packet length: %d bytes\n", 4308 SPP_ARGS(ifp), len); 4309 return; 4310 } 4311 h = mtod (m, struct lcp_header*); 4312 if (len > ntohs (h->len)) 4313 len = ntohs (h->len); 4314 switch (h->type) { 4315 /* PAP request is my authproto */ 4316 case PAP_REQ: 4317 name = 1 + (u_char*)(h+1); 4318 name_len = name[-1]; 4319 passwd = name + name_len + 1; 4320 if (name_len > len - 6 || 4321 (passwd_len = passwd[-1]) > len - 6 - name_len) { 4322 if (debug) { 4323 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4324 "<%s id=0x%x len=%d", 4325 SPP_ARGS(ifp), 4326 sppp_auth_type_name(PPP_PAP, h->type), 4327 h->ident, ntohs(h->len)); 4328 sppp_print_bytes((u_char*)(h+1), len-4); 4329 addlog(">\n"); 4330 } 4331 break; 4332 } 4333 if (debug) { 4334 log(LOG_DEBUG, SPP_FMT "pap input(%s) " 4335 "<%s id=0x%x len=%d name=", 4336 SPP_ARGS(ifp), 4337 sppp_state_name(sp->state[IDX_PAP]), 4338 sppp_auth_type_name(PPP_PAP, h->type), 4339 h->ident, ntohs(h->len)); 4340 sppp_print_string((char*)name, name_len); 4341 addlog(" passwd="); 4342 sppp_print_string((char*)passwd, passwd_len); 4343 addlog(">\n"); 4344 } 4345 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) || 4346 passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) || 4347 bcmp(name, sp->hisauth.name, name_len) != 0 || 4348 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) { 4349 /* action scn, tld */ 4350 mlen = sizeof(FAILMSG) - 1; 4351 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4352 sizeof mlen, (const char *)&mlen, 4353 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4354 0); 4355 pap.tld(sp); 4356 break; 4357 } 4358 /* action sca, perhaps tlu */ 4359 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4360 sp->state[IDX_PAP] == STATE_OPENED) { 4361 mlen = sizeof(SUCCMSG) - 1; 4362 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4363 sizeof mlen, (const char *)&mlen, 4364 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4365 0); 4366 } 4367 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4368 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4369 pap.tlu(sp); 4370 } 4371 break; 4372 4373 /* ack and nak are his authproto */ 4374 case PAP_ACK: 4375 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 4376 if (debug) { 4377 log(LOG_DEBUG, SPP_FMT "pap success", 4378 SPP_ARGS(ifp)); 4379 name_len = *((char *)h); 4380 if (len > 5 && name_len) { 4381 addlog(": "); 4382 sppp_print_string((char*)(h+1), name_len); 4383 } 4384 addlog("\n"); 4385 } 4386 x = splimp(); 4387 sp->pp_flags &= ~PP_NEEDAUTH; 4388 if (sp->myauth.proto == PPP_PAP && 4389 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4390 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4391 /* 4392 * We are authenticator for PAP but didn't 4393 * complete yet. Leave it to tlu to proceed 4394 * to network phase. 4395 */ 4396 splx(x); 4397 break; 4398 } 4399 splx(x); 4400 sppp_phase_network(sp); 4401 break; 4402 4403 case PAP_NAK: 4404 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 4405 if (debug) { 4406 log(LOG_INFO, SPP_FMT "pap failure", 4407 SPP_ARGS(ifp)); 4408 name_len = *((char *)h); 4409 if (len > 5 && name_len) { 4410 addlog(": "); 4411 sppp_print_string((char*)(h+1), name_len); 4412 } 4413 addlog("\n"); 4414 } else 4415 log(LOG_INFO, SPP_FMT "pap failure\n", 4416 SPP_ARGS(ifp)); 4417 /* await LCP shutdown by authenticator */ 4418 break; 4419 4420 default: 4421 /* Unknown PAP packet type -- ignore. */ 4422 if (debug) { 4423 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4424 "<0x%x id=0x%x len=%d", 4425 SPP_ARGS(ifp), 4426 h->type, h->ident, ntohs(h->len)); 4427 sppp_print_bytes((u_char*)(h+1), len-4); 4428 addlog(">\n"); 4429 } 4430 break; 4431 4432 } 4433 } 4434 4435 static void 4436 sppp_pap_init(struct sppp *sp) 4437 { 4438 /* PAP doesn't have STATE_INITIAL at all. */ 4439 sp->state[IDX_PAP] = STATE_CLOSED; 4440 sp->fail_counter[IDX_PAP] = 0; 4441 sp->pp_seq[IDX_PAP] = 0; 4442 sp->pp_rseq[IDX_PAP] = 0; 4443 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 4444 callout_handle_init(&sp->ch[IDX_PAP]); 4445 callout_handle_init(&sp->pap_my_to_ch); 4446 #endif 4447 } 4448 4449 static void 4450 sppp_pap_open(struct sppp *sp) 4451 { 4452 if (sp->hisauth.proto == PPP_PAP && 4453 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4454 /* we are authenticator for PAP, start our timer */ 4455 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4456 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4457 } 4458 if (sp->myauth.proto == PPP_PAP) { 4459 /* we are peer, send a request, and start a timer */ 4460 pap.scr(sp); 4461 TIMEOUT(sppp_pap_my_TO, (void *)sp, sp->lcp.timeout, 4462 sp->pap_my_to_ch); 4463 } 4464 } 4465 4466 static void 4467 sppp_pap_close(struct sppp *sp) 4468 { 4469 if (sp->state[IDX_PAP] != STATE_CLOSED) 4470 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4471 } 4472 4473 /* 4474 * That's the timeout routine if we are authenticator. Since the 4475 * authenticator is basically passive in PAP, we can't do much here. 4476 */ 4477 static void 4478 sppp_pap_TO(void *cookie) 4479 { 4480 struct sppp *sp = (struct sppp *)cookie; 4481 STDDCL; 4482 int s; 4483 4484 s = splimp(); 4485 if (debug) 4486 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n", 4487 SPP_ARGS(ifp), 4488 sppp_state_name(sp->state[IDX_PAP]), 4489 sp->rst_counter[IDX_PAP]); 4490 4491 if (--sp->rst_counter[IDX_PAP] < 0) 4492 /* TO- event */ 4493 switch (sp->state[IDX_PAP]) { 4494 case STATE_REQ_SENT: 4495 pap.tld(sp); 4496 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4497 break; 4498 } 4499 else 4500 /* TO+ event, not very much we could do */ 4501 switch (sp->state[IDX_PAP]) { 4502 case STATE_REQ_SENT: 4503 /* sppp_cp_change_state() will restart the timer */ 4504 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4505 break; 4506 } 4507 4508 splx(s); 4509 } 4510 4511 /* 4512 * That's the timeout handler if we are peer. Since the peer is active, 4513 * we need to retransmit our PAP request since it is apparently lost. 4514 * XXX We should impose a max counter. 4515 */ 4516 static void 4517 sppp_pap_my_TO(void *cookie) 4518 { 4519 struct sppp *sp = (struct sppp *)cookie; 4520 STDDCL; 4521 4522 if (debug) 4523 log(LOG_DEBUG, SPP_FMT "pap peer TO\n", 4524 SPP_ARGS(ifp)); 4525 4526 pap.scr(sp); 4527 } 4528 4529 static void 4530 sppp_pap_tlu(struct sppp *sp) 4531 { 4532 STDDCL; 4533 int x; 4534 4535 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4536 4537 if (debug) 4538 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 4539 SPP_ARGS(ifp), pap.name); 4540 4541 x = splimp(); 4542 /* indicate to LCP that we need to be closed down */ 4543 sp->lcp.protos |= (1 << IDX_PAP); 4544 4545 if (sp->pp_flags & PP_NEEDAUTH) { 4546 /* 4547 * Remote is authenticator, but his auth proto didn't 4548 * complete yet. Defer the transition to network 4549 * phase. 4550 */ 4551 splx(x); 4552 return; 4553 } 4554 splx(x); 4555 sppp_phase_network(sp); 4556 } 4557 4558 static void 4559 sppp_pap_tld(struct sppp *sp) 4560 { 4561 STDDCL; 4562 4563 if (debug) 4564 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp)); 4565 UNTIMEOUT(pap.TO, (void *)sp, sp->ch[IDX_PAP]); 4566 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 4567 sp->lcp.protos &= ~(1 << IDX_PAP); 4568 4569 lcp.Close(sp); 4570 } 4571 4572 static void 4573 sppp_pap_scr(struct sppp *sp) 4574 { 4575 u_char idlen, pwdlen; 4576 4577 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4578 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN); 4579 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN); 4580 4581 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4582 sizeof idlen, (const char *)&idlen, 4583 (size_t)idlen, sp->myauth.name, 4584 sizeof pwdlen, (const char *)&pwdlen, 4585 (size_t)pwdlen, sp->myauth.secret, 4586 0); 4587 } 4588 4589 /* 4590 * Random miscellaneous functions. 4591 */ 4592 4593 /* 4594 * Send a PAP or CHAP proto packet. 4595 * 4596 * Varadic function, each of the elements for the ellipsis is of type 4597 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4598 * mlen == 0. 4599 * NOTE: never declare variadic functions with types subject to type 4600 * promotion (i.e. u_char). This is asking for big trouble depending 4601 * on the architecture you are on... 4602 */ 4603 4604 static void 4605 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4606 unsigned int type, unsigned int id, 4607 ...) 4608 { 4609 STDDCL; 4610 struct ppp_header *h; 4611 struct lcp_header *lh; 4612 struct mbuf *m; 4613 u_char *p; 4614 int len; 4615 unsigned int mlen; 4616 const char *msg; 4617 __va_list ap; 4618 4619 MGETHDR (m, M_DONTWAIT, MT_DATA); 4620 if (! m) 4621 return; 4622 m->m_pkthdr.rcvif = 0; 4623 4624 h = mtod (m, struct ppp_header*); 4625 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4626 h->control = PPP_UI; /* Unnumbered Info */ 4627 h->protocol = htons(cp->proto); 4628 4629 lh = (struct lcp_header*)(h + 1); 4630 lh->type = type; 4631 lh->ident = id; 4632 p = (u_char*) (lh+1); 4633 4634 __va_start(ap, id); 4635 len = 0; 4636 4637 while ((mlen = (unsigned int)__va_arg(ap, size_t)) != 0) { 4638 msg = __va_arg(ap, const char *); 4639 len += mlen; 4640 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) { 4641 __va_end(ap); 4642 m_freem(m); 4643 return; 4644 } 4645 4646 bcopy(msg, p, mlen); 4647 p += mlen; 4648 } 4649 __va_end(ap); 4650 4651 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len; 4652 lh->len = htons (LCP_HEADER_LEN + len); 4653 4654 if (debug) { 4655 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 4656 SPP_ARGS(ifp), cp->name, 4657 sppp_auth_type_name(cp->proto, lh->type), 4658 lh->ident, ntohs(lh->len)); 4659 sppp_print_bytes((u_char*) (lh+1), len); 4660 addlog(">\n"); 4661 } 4662 if (IF_QFULL (&sp->pp_cpq)) { 4663 IF_DROP (&sp->pp_fastq); 4664 IF_DROP (&ifp->if_snd); 4665 m_freem (m); 4666 ++ifp->if_oerrors; 4667 } else 4668 IF_ENQUEUE (&sp->pp_cpq, m); 4669 if (! (ifp->if_flags & IFF_OACTIVE)) 4670 (*ifp->if_start) (ifp); 4671 ifp->if_obytes += m->m_pkthdr.len + 3; 4672 } 4673 4674 /* 4675 * Flush interface queue. 4676 */ 4677 static void 4678 sppp_qflush(struct ifqueue *ifq) 4679 { 4680 struct mbuf *m, *n; 4681 4682 n = ifq->ifq_head; 4683 while ((m = n)) { 4684 n = m->m_act; 4685 m_freem (m); 4686 } 4687 ifq->ifq_head = 0; 4688 ifq->ifq_tail = 0; 4689 ifq->ifq_len = 0; 4690 } 4691 4692 /* 4693 * Send keepalive packets, every 10 seconds. 4694 */ 4695 static void 4696 sppp_keepalive(void *dummy) 4697 { 4698 struct sppp *sp; 4699 int s; 4700 4701 s = splimp(); 4702 for (sp=spppq; sp; sp=sp->pp_next) { 4703 struct ifnet *ifp = &sp->pp_if; 4704 4705 /* Keepalive mode disabled or channel down? */ 4706 if (! (sp->pp_flags & PP_KEEPALIVE) || 4707 ! (ifp->if_flags & IFF_RUNNING)) 4708 continue; 4709 4710 /* No keepalive in PPP mode if LCP not opened yet. */ 4711 if (sp->pp_mode != IFF_CISCO && 4712 sp->pp_phase < PHASE_AUTHENTICATE) 4713 continue; 4714 4715 if (sp->pp_alivecnt == MAXALIVECNT) { 4716 /* No keepalive packets got. Stop the interface. */ 4717 printf (SPP_FMT "down\n", SPP_ARGS(ifp)); 4718 if_down (ifp); 4719 sppp_qflush (&sp->pp_cpq); 4720 if (sp->pp_mode != IFF_CISCO) { 4721 /* XXX */ 4722 /* Shut down the PPP link. */ 4723 lcp.Down(sp); 4724 /* Initiate negotiation. XXX */ 4725 lcp.Up(sp); 4726 } 4727 } 4728 if (sp->pp_alivecnt <= MAXALIVECNT) 4729 ++sp->pp_alivecnt; 4730 if (sp->pp_mode == IFF_CISCO) 4731 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, 4732 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4733 else if (sp->pp_phase >= PHASE_AUTHENTICATE) { 4734 long nmagic = htonl (sp->lcp.magic); 4735 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4736 sppp_cp_send (sp, PPP_LCP, ECHO_REQ, 4737 sp->lcp.echoid, 4, &nmagic); 4738 } 4739 } 4740 splx(s); 4741 TIMEOUT(sppp_keepalive, 0, hz * 10, keepalive_ch); 4742 } 4743 4744 /* 4745 * Get both IP addresses. 4746 */ 4747 static void 4748 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask) 4749 { 4750 struct ifnet *ifp = &sp->pp_if; 4751 struct ifaddr *ifa; 4752 struct sockaddr_in *si, *sm; 4753 u_long ssrc, ddst; 4754 4755 sm = NULL; 4756 ssrc = ddst = 0L; 4757 /* 4758 * Pick the first AF_INET address from the list, 4759 * aliases don't make any sense on a p2p link anyway. 4760 */ 4761 si = 0; 4762 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 4763 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 4764 #elif defined(__NetBSD__) || defined (__OpenBSD__) 4765 for (ifa = ifp->if_addrlist.tqh_first; 4766 ifa; 4767 ifa = ifa->ifa_list.tqe_next) 4768 #else 4769 for (ifa = ifp->if_addrlist; 4770 ifa; 4771 ifa = ifa->ifa_next) 4772 #endif 4773 if (ifa->ifa_addr->sa_family == AF_INET) { 4774 si = (struct sockaddr_in *)ifa->ifa_addr; 4775 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4776 if (si) 4777 break; 4778 } 4779 if (ifa) { 4780 if (si && si->sin_addr.s_addr) { 4781 ssrc = si->sin_addr.s_addr; 4782 if (srcmask) 4783 *srcmask = ntohl(sm->sin_addr.s_addr); 4784 } 4785 4786 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4787 if (si && si->sin_addr.s_addr) 4788 ddst = si->sin_addr.s_addr; 4789 } 4790 4791 if (dst) *dst = ntohl(ddst); 4792 if (src) *src = ntohl(ssrc); 4793 } 4794 4795 /* 4796 * Set my IP address. Must be called at splimp. 4797 */ 4798 static void 4799 sppp_set_ip_addr(struct sppp *sp, u_long src) 4800 { 4801 STDDCL; 4802 struct ifaddr *ifa; 4803 struct sockaddr_in *si; 4804 struct in_ifaddr *ia; 4805 4806 /* 4807 * Pick the first AF_INET address from the list, 4808 * aliases don't make any sense on a p2p link anyway. 4809 */ 4810 si = 0; 4811 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 4812 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 4813 #elif defined(__NetBSD__) || defined (__OpenBSD__) 4814 for (ifa = ifp->if_addrlist.tqh_first; 4815 ifa; 4816 ifa = ifa->ifa_list.tqe_next) 4817 #else 4818 for (ifa = ifp->if_addrlist; 4819 ifa; 4820 ifa = ifa->ifa_next) 4821 #endif 4822 { 4823 if (ifa->ifa_addr->sa_family == AF_INET) 4824 { 4825 si = (struct sockaddr_in *)ifa->ifa_addr; 4826 if (si) 4827 break; 4828 } 4829 } 4830 4831 if (ifa && si) 4832 { 4833 int error; 4834 #if __NetBSD_Version__ >= 103080000 4835 struct sockaddr_in new_sin = *si; 4836 4837 new_sin.sin_addr.s_addr = htonl(src); 4838 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 1); 4839 if(debug && error) 4840 { 4841 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: in_ifinit " 4842 " failed, error=%d\n", SPP_ARGS(ifp), error); 4843 } 4844 #else 4845 /* delete old route */ 4846 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST); 4847 if(debug && error) 4848 { 4849 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n", 4850 SPP_ARGS(ifp), error); 4851 } 4852 4853 /* set new address */ 4854 si->sin_addr.s_addr = htonl(src); 4855 ia = ifatoia(ifa); 4856 LIST_REMOVE(ia, ia_hash); 4857 LIST_INSERT_HEAD(INADDR_HASH(si->sin_addr.s_addr), ia, ia_hash); 4858 4859 /* add new route */ 4860 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST); 4861 if (debug && error) 4862 { 4863 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d", 4864 SPP_ARGS(ifp), error); 4865 } 4866 #endif 4867 } 4868 } 4869 4870 #ifdef INET6 4871 /* 4872 * Get both IPv6 addresses. 4873 */ 4874 static void 4875 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4876 struct in6_addr *srcmask) 4877 { 4878 struct ifnet *ifp = &sp->pp_if; 4879 struct ifaddr *ifa; 4880 struct sockaddr_in6 *si, *sm; 4881 struct in6_addr ssrc, ddst; 4882 4883 sm = NULL; 4884 bzero(&ssrc, sizeof(ssrc)); 4885 bzero(&ddst, sizeof(ddst)); 4886 /* 4887 * Pick the first link-local AF_INET6 address from the list, 4888 * aliases don't make any sense on a p2p link anyway. 4889 */ 4890 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 4891 for (ifa = ifp->if_addrhead.tqh_first, si = 0; 4892 ifa; 4893 ifa = ifa->ifa_link.tqe_next) 4894 #elif defined(__NetBSD__) || defined (__OpenBSD__) 4895 for (ifa = ifp->if_addrlist.tqh_first, si = 0; 4896 ifa; 4897 ifa = ifa->ifa_list.tqe_next) 4898 #else 4899 for (ifa = ifp->if_addrlist, si = 0; 4900 ifa; 4901 ifa = ifa->ifa_next) 4902 #endif 4903 if (ifa->ifa_addr->sa_family == AF_INET6) { 4904 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4905 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4906 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4907 break; 4908 } 4909 if (ifa) { 4910 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4911 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 4912 if (srcmask) { 4913 bcopy(&sm->sin6_addr, srcmask, 4914 sizeof(*srcmask)); 4915 } 4916 } 4917 4918 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4919 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4920 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 4921 } 4922 4923 if (dst) 4924 bcopy(&ddst, dst, sizeof(*dst)); 4925 if (src) 4926 bcopy(&ssrc, src, sizeof(*src)); 4927 } 4928 4929 #ifdef IPV6CP_MYIFID_DYN 4930 /* 4931 * Generate random ifid. 4932 */ 4933 static void 4934 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 4935 { 4936 /* TBD */ 4937 } 4938 4939 /* 4940 * Set my IPv6 address. Must be called at splimp. 4941 */ 4942 static void 4943 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 4944 { 4945 STDDCL; 4946 struct ifaddr *ifa; 4947 struct sockaddr_in6 *sin6; 4948 4949 /* 4950 * Pick the first link-local AF_INET6 address from the list, 4951 * aliases don't make any sense on a p2p link anyway. 4952 */ 4953 4954 sin6 = NULL; 4955 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 4956 for (ifa = ifp->if_addrhead.tqh_first; 4957 ifa; 4958 ifa = ifa->ifa_link.tqe_next) 4959 #elif defined(__NetBSD__) || defined (__OpenBSD__) 4960 for (ifa = ifp->if_addrlist.tqh_first; 4961 ifa; 4962 ifa = ifa->ifa_list.tqe_next) 4963 #else 4964 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 4965 #endif 4966 { 4967 if (ifa->ifa_addr->sa_family == AF_INET6) 4968 { 4969 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 4970 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 4971 break; 4972 } 4973 } 4974 4975 if (ifa && sin6) 4976 { 4977 int error; 4978 struct sockaddr_in6 new_sin6 = *sin6; 4979 4980 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 4981 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 4982 if (debug && error) 4983 { 4984 log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit " 4985 " failed, error=%d\n", SPP_ARGS(ifp), error); 4986 } 4987 } 4988 } 4989 #endif 4990 4991 /* 4992 * Suggest a candidate address to be used by peer. 4993 */ 4994 static void 4995 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 4996 { 4997 struct in6_addr myaddr; 4998 struct timeval tv; 4999 5000 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5001 5002 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5003 microtime(&tv); 5004 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5005 myaddr.s6_addr[14] ^= 0xff; 5006 myaddr.s6_addr[15] ^= 0xff; 5007 } else { 5008 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5009 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5010 } 5011 if (suggest) 5012 bcopy(&myaddr, suggest, sizeof(myaddr)); 5013 } 5014 #endif /*INET6*/ 5015 5016 static int 5017 sppp_params(struct sppp *sp, u_long cmd, void *data) 5018 { 5019 u_long subcmd; 5020 struct ifreq *ifr = (struct ifreq *)data; 5021 struct spppreq *spr; 5022 int rv = 0; 5023 5024 if ((spr = malloc(sizeof(struct spppreq), M_TEMP, M_NOWAIT)) == 0) 5025 return (EAGAIN); 5026 /* 5027 * ifr->ifr_data is supposed to point to a struct spppreq. 5028 * Check the cmd word first before attempting to fetch all the 5029 * data. 5030 */ 5031 if ((subcmd = fuword(ifr->ifr_data)) == -1) { 5032 rv = EFAULT; 5033 goto quit; 5034 } 5035 5036 if (copyin((caddr_t)ifr->ifr_data, spr, sizeof(struct spppreq)) != 0) { 5037 rv = EFAULT; 5038 goto quit; 5039 } 5040 5041 switch (subcmd) { 5042 case (int)SPPPIOGDEFS: 5043 if (cmd != SIOCGIFGENERIC) { 5044 rv = EINVAL; 5045 break; 5046 } 5047 /* 5048 * We copy over the entire current state, but clean 5049 * out some of the stuff we don't wanna pass up. 5050 * Remember, SIOCGIFGENERIC is unprotected, and can be 5051 * called by any user. No need to ever get PAP or 5052 * CHAP secrets back to userland anyway. 5053 */ 5054 spr->defs.pp_phase = sp->pp_phase; 5055 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0; 5056 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0; 5057 spr->defs.lcp = sp->lcp; 5058 spr->defs.ipcp = sp->ipcp; 5059 spr->defs.ipv6cp = sp->ipv6cp; 5060 spr->defs.myauth = sp->myauth; 5061 spr->defs.hisauth = sp->hisauth; 5062 bzero(spr->defs.myauth.secret, AUTHKEYLEN); 5063 bzero(spr->defs.myauth.challenge, AUTHKEYLEN); 5064 bzero(spr->defs.hisauth.secret, AUTHKEYLEN); 5065 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN); 5066 /* 5067 * Fixup the LCP timeout value to milliseconds so 5068 * spppcontrol doesn't need to bother about the value 5069 * of "hz". We do the reverse calculation below when 5070 * setting it. 5071 */ 5072 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz; 5073 rv = copyout(spr, (caddr_t)ifr->ifr_data, 5074 sizeof(struct spppreq)); 5075 break; 5076 5077 case (int)SPPPIOSDEFS: 5078 if (cmd != SIOCSIFGENERIC) { 5079 rv = EINVAL; 5080 break; 5081 } 5082 /* 5083 * We have a very specific idea of which fields we 5084 * allow being passed back from userland, so to not 5085 * clobber our current state. For one, we only allow 5086 * setting anything if LCP is in dead or establish 5087 * phase. Once the authentication negotiations 5088 * started, the authentication settings must not be 5089 * changed again. (The administrator can force an 5090 * ifconfig down in order to get LCP back into dead 5091 * phase.) 5092 * 5093 * Also, we only allow for authentication parameters to be 5094 * specified. 5095 * 5096 * XXX Should allow to set or clear pp_flags. 5097 * 5098 * Finally, if the respective authentication protocol to 5099 * be used is set differently than 0, but the secret is 5100 * passed as all zeros, we don't trash the existing secret. 5101 * This allows an administrator to change the system name 5102 * only without clobbering the secret (which he didn't get 5103 * back in a previous SPPPIOGDEFS call). However, the 5104 * secrets are cleared if the authentication protocol is 5105 * reset to 0. */ 5106 if (sp->pp_phase != PHASE_DEAD && 5107 sp->pp_phase != PHASE_ESTABLISH) { 5108 rv = EBUSY; 5109 break; 5110 } 5111 5112 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP && 5113 spr->defs.myauth.proto != PPP_CHAP) || 5114 (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP && 5115 spr->defs.hisauth.proto != PPP_CHAP)) { 5116 rv = EINVAL; 5117 break; 5118 } 5119 5120 if (spr->defs.myauth.proto == 0) 5121 /* resetting myauth */ 5122 bzero(&sp->myauth, sizeof sp->myauth); 5123 else { 5124 /* setting/changing myauth */ 5125 sp->myauth.proto = spr->defs.myauth.proto; 5126 bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN); 5127 if (spr->defs.myauth.secret[0] != '\0') 5128 bcopy(spr->defs.myauth.secret, sp->myauth.secret, 5129 AUTHKEYLEN); 5130 } 5131 if (spr->defs.hisauth.proto == 0) 5132 /* resetting hisauth */ 5133 bzero(&sp->hisauth, sizeof sp->hisauth); 5134 else { 5135 /* setting/changing hisauth */ 5136 sp->hisauth.proto = spr->defs.hisauth.proto; 5137 sp->hisauth.flags = spr->defs.hisauth.flags; 5138 bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN); 5139 if (spr->defs.hisauth.secret[0] != '\0') 5140 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret, 5141 AUTHKEYLEN); 5142 } 5143 /* set LCP restart timer timeout */ 5144 if (spr->defs.lcp.timeout != 0) 5145 sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000; 5146 /* set VJ enable and IPv6 disable flags */ 5147 #ifdef INET 5148 if (spr->defs.enable_vj) 5149 sp->confflags |= CONF_ENABLE_VJ; 5150 else 5151 sp->confflags &= ~CONF_ENABLE_VJ; 5152 #endif 5153 #ifdef INET6 5154 if (spr->defs.enable_ipv6) 5155 sp->confflags |= CONF_ENABLE_IPV6; 5156 else 5157 sp->confflags &= ~CONF_ENABLE_IPV6; 5158 #endif 5159 break; 5160 5161 default: 5162 rv = EINVAL; 5163 } 5164 5165 quit: 5166 free(spr, M_TEMP); 5167 5168 return (rv); 5169 } 5170 5171 static void 5172 sppp_phase_network(struct sppp *sp) 5173 { 5174 STDDCL; 5175 int i; 5176 u_long mask; 5177 5178 sp->pp_phase = PHASE_NETWORK; 5179 5180 if (debug) 5181 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 5182 sppp_phase_name(sp->pp_phase)); 5183 5184 /* Notify NCPs now. */ 5185 for (i = 0; i < IDX_COUNT; i++) 5186 if ((cps[i])->flags & CP_NCP) 5187 (cps[i])->Open(sp); 5188 5189 /* Send Up events to all NCPs. */ 5190 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5191 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5192 (cps[i])->Up(sp); 5193 5194 /* if no NCP is starting, all this was in vain, close down */ 5195 sppp_lcp_check_and_close(sp); 5196 } 5197 5198 5199 static const char * 5200 sppp_cp_type_name(u_char type) 5201 { 5202 static char buf[12]; 5203 switch (type) { 5204 case CONF_REQ: return "conf-req"; 5205 case CONF_ACK: return "conf-ack"; 5206 case CONF_NAK: return "conf-nak"; 5207 case CONF_REJ: return "conf-rej"; 5208 case TERM_REQ: return "term-req"; 5209 case TERM_ACK: return "term-ack"; 5210 case CODE_REJ: return "code-rej"; 5211 case PROTO_REJ: return "proto-rej"; 5212 case ECHO_REQ: return "echo-req"; 5213 case ECHO_REPLY: return "echo-reply"; 5214 case DISC_REQ: return "discard-req"; 5215 } 5216 snprintf (buf, sizeof(buf), "cp/0x%x", type); 5217 return buf; 5218 } 5219 5220 static const char * 5221 sppp_auth_type_name(u_short proto, u_char type) 5222 { 5223 static char buf[12]; 5224 switch (proto) { 5225 case PPP_CHAP: 5226 switch (type) { 5227 case CHAP_CHALLENGE: return "challenge"; 5228 case CHAP_RESPONSE: return "response"; 5229 case CHAP_SUCCESS: return "success"; 5230 case CHAP_FAILURE: return "failure"; 5231 } 5232 case PPP_PAP: 5233 switch (type) { 5234 case PAP_REQ: return "req"; 5235 case PAP_ACK: return "ack"; 5236 case PAP_NAK: return "nak"; 5237 } 5238 } 5239 snprintf (buf, sizeof(buf), "auth/0x%x", type); 5240 return buf; 5241 } 5242 5243 static const char * 5244 sppp_lcp_opt_name(u_char opt) 5245 { 5246 static char buf[12]; 5247 switch (opt) { 5248 case LCP_OPT_MRU: return "mru"; 5249 case LCP_OPT_ASYNC_MAP: return "async-map"; 5250 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5251 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5252 case LCP_OPT_MAGIC: return "magic"; 5253 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5254 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5255 } 5256 snprintf (buf, sizeof(buf), "lcp/0x%x", opt); 5257 return buf; 5258 } 5259 5260 static const char * 5261 sppp_ipcp_opt_name(u_char opt) 5262 { 5263 static char buf[12]; 5264 switch (opt) { 5265 case IPCP_OPT_ADDRESSES: return "addresses"; 5266 case IPCP_OPT_COMPRESSION: return "compression"; 5267 case IPCP_OPT_ADDRESS: return "address"; 5268 } 5269 snprintf (buf, sizeof(buf), "ipcp/0x%x", opt); 5270 return buf; 5271 } 5272 5273 #ifdef INET6 5274 static const char * 5275 sppp_ipv6cp_opt_name(u_char opt) 5276 { 5277 static char buf[12]; 5278 switch (opt) { 5279 case IPV6CP_OPT_IFID: return "ifid"; 5280 case IPV6CP_OPT_COMPRESSION: return "compression"; 5281 } 5282 sprintf (buf, "0x%x", opt); 5283 return buf; 5284 } 5285 #endif 5286 5287 static const char * 5288 sppp_state_name(int state) 5289 { 5290 switch (state) { 5291 case STATE_INITIAL: return "initial"; 5292 case STATE_STARTING: return "starting"; 5293 case STATE_CLOSED: return "closed"; 5294 case STATE_STOPPED: return "stopped"; 5295 case STATE_CLOSING: return "closing"; 5296 case STATE_STOPPING: return "stopping"; 5297 case STATE_REQ_SENT: return "req-sent"; 5298 case STATE_ACK_RCVD: return "ack-rcvd"; 5299 case STATE_ACK_SENT: return "ack-sent"; 5300 case STATE_OPENED: return "opened"; 5301 } 5302 return "illegal"; 5303 } 5304 5305 static const char * 5306 sppp_phase_name(enum ppp_phase phase) 5307 { 5308 switch (phase) { 5309 case PHASE_DEAD: return "dead"; 5310 case PHASE_ESTABLISH: return "establish"; 5311 case PHASE_TERMINATE: return "terminate"; 5312 case PHASE_AUTHENTICATE: return "authenticate"; 5313 case PHASE_NETWORK: return "network"; 5314 } 5315 return "illegal"; 5316 } 5317 5318 static const char * 5319 sppp_proto_name(u_short proto) 5320 { 5321 static char buf[12]; 5322 switch (proto) { 5323 case PPP_LCP: return "lcp"; 5324 case PPP_IPCP: return "ipcp"; 5325 case PPP_PAP: return "pap"; 5326 case PPP_CHAP: return "chap"; 5327 case PPP_IPV6CP: return "ipv6cp"; 5328 } 5329 snprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto); 5330 return buf; 5331 } 5332 5333 static void 5334 sppp_print_bytes(const u_char *p, u_short len) 5335 { 5336 if (len) 5337 addlog(" %*D", len, p, "-"); 5338 } 5339 5340 static void 5341 sppp_print_string(const char *p, u_short len) 5342 { 5343 u_char c; 5344 5345 while (len-- > 0) { 5346 c = *p++; 5347 /* 5348 * Print only ASCII chars directly. RFC 1994 recommends 5349 * using only them, but we don't rely on it. */ 5350 if (c < ' ' || c > '~') 5351 addlog("\\x%x", c); 5352 else 5353 addlog("%c", c); 5354 } 5355 } 5356 5357 static const char * 5358 sppp_dotted_quad(u_long addr) 5359 { 5360 static char s[16]; 5361 sprintf(s, "%d.%d.%d.%d", 5362 (int)((addr >> 24) & 0xff), 5363 (int)((addr >> 16) & 0xff), 5364 (int)((addr >> 8) & 0xff), 5365 (int)(addr & 0xff)); 5366 return s; 5367 } 5368 5369 static int 5370 sppp_strnlen(u_char *p, int max) 5371 { 5372 int len; 5373 5374 for (len = 0; len < max && *p; ++p) 5375 ++len; 5376 return len; 5377 } 5378 5379 /* a dummy, used to drop uninteresting events */ 5380 static void 5381 sppp_null(struct sppp *unused) 5382 { 5383 /* do just nothing */ 5384 } 5385