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 1.16 2004/08/02 13:22:33 joerg Exp $ 22 */ 23 24 #include <sys/param.h> 25 26 #if defined(__DragonFly__) 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(__DragonFly__) 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 (__DragonFly__) || 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(__DragonFly__) 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(__DragonFly__) 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, MB_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, MB_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_WAITOK); 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(__DragonFly__) 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(__DragonFly__) 1338 struct timeval tv; 1339 #else 1340 u_long t = (time.tv_sec - boottime.tv_sec) * 1000; 1341 #endif 1342 1343 #if defined(__DragonFly__) 1344 getmicrouptime(&tv); 1345 #endif 1346 1347 MGETHDR (m, MB_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(__DragonFly__) 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, MB_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(__DragonFly__) 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_INTWAIT); 2246 2247 if (debug) 2248 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ", 2249 SPP_ARGS(ifp)); 2250 2251 /* pass 1: check for things that need to be rejected */ 2252 p = (void*) (h+1); 2253 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2254 if (debug) 2255 addlog(" %s ", sppp_lcp_opt_name(*p)); 2256 switch (*p) { 2257 case LCP_OPT_MAGIC: 2258 /* Magic number. */ 2259 if (len >= 6 && p[1] == 6) 2260 continue; 2261 if (debug) 2262 addlog("[invalid] "); 2263 break; 2264 case LCP_OPT_ASYNC_MAP: 2265 /* Async control character map. */ 2266 if (len >= 6 && p[1] == 6) 2267 continue; 2268 if (debug) 2269 addlog("[invalid] "); 2270 break; 2271 case LCP_OPT_MRU: 2272 /* Maximum receive unit. */ 2273 if (len >= 4 && p[1] == 4) 2274 continue; 2275 if (debug) 2276 addlog("[invalid] "); 2277 break; 2278 case LCP_OPT_AUTH_PROTO: 2279 if (len < 4) { 2280 if (debug) 2281 addlog("[invalid] "); 2282 break; 2283 } 2284 authproto = (p[2] << 8) + p[3]; 2285 if (authproto == PPP_CHAP && p[1] != 5) { 2286 if (debug) 2287 addlog("[invalid chap len] "); 2288 break; 2289 } 2290 if (sp->myauth.proto == 0) { 2291 /* we are not configured to do auth */ 2292 if (debug) 2293 addlog("[not configured] "); 2294 break; 2295 } 2296 /* 2297 * Remote want us to authenticate, remember this, 2298 * so we stay in PHASE_AUTHENTICATE after LCP got 2299 * up. 2300 */ 2301 sp->pp_flags |= PP_NEEDAUTH; 2302 continue; 2303 default: 2304 /* Others not supported. */ 2305 if (debug) 2306 addlog("[rej] "); 2307 break; 2308 } 2309 /* Add the option to rejected list. */ 2310 bcopy (p, r, p[1]); 2311 r += p[1]; 2312 rlen += p[1]; 2313 } 2314 if (rlen) { 2315 if (debug) 2316 addlog(" send conf-rej\n"); 2317 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2318 return 0; 2319 } else if (debug) 2320 addlog("\n"); 2321 2322 /* 2323 * pass 2: check for option values that are unacceptable and 2324 * thus require to be nak'ed. 2325 */ 2326 if (debug) 2327 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ", 2328 SPP_ARGS(ifp)); 2329 2330 p = (void*) (h+1); 2331 len = origlen; 2332 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2333 if (debug) 2334 addlog(" %s ", sppp_lcp_opt_name(*p)); 2335 switch (*p) { 2336 case LCP_OPT_MAGIC: 2337 /* Magic number -- extract. */ 2338 nmagic = (u_long)p[2] << 24 | 2339 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 2340 if (nmagic != sp->lcp.magic) { 2341 sp->pp_loopcnt = 0; 2342 if (debug) 2343 addlog("0x%lx ", nmagic); 2344 continue; 2345 } 2346 if (debug && sp->pp_loopcnt < MAXALIVECNT*5) 2347 addlog("[glitch] "); 2348 ++sp->pp_loopcnt; 2349 /* 2350 * We negate our magic here, and NAK it. If 2351 * we see it later in an NAK packet, we 2352 * suggest a new one. 2353 */ 2354 nmagic = ~sp->lcp.magic; 2355 /* Gonna NAK it. */ 2356 p[2] = nmagic >> 24; 2357 p[3] = nmagic >> 16; 2358 p[4] = nmagic >> 8; 2359 p[5] = nmagic; 2360 break; 2361 2362 case LCP_OPT_ASYNC_MAP: 2363 /* 2364 * Async control character map -- just ignore it. 2365 * 2366 * Quote from RFC 1662, chapter 6: 2367 * To enable this functionality, synchronous PPP 2368 * implementations MUST always respond to the 2369 * Async-Control-Character-Map Configuration 2370 * Option with the LCP Configure-Ack. However, 2371 * acceptance of the Configuration Option does 2372 * not imply that the synchronous implementation 2373 * will do any ACCM mapping. Instead, all such 2374 * octet mapping will be performed by the 2375 * asynchronous-to-synchronous converter. 2376 */ 2377 continue; 2378 2379 case LCP_OPT_MRU: 2380 /* 2381 * Maximum receive unit. Always agreeable, 2382 * but ignored by now. 2383 */ 2384 sp->lcp.their_mru = p[2] * 256 + p[3]; 2385 if (debug) 2386 addlog("%lu ", sp->lcp.their_mru); 2387 continue; 2388 2389 case LCP_OPT_AUTH_PROTO: 2390 authproto = (p[2] << 8) + p[3]; 2391 if (sp->myauth.proto != authproto) { 2392 /* not agreed, nak */ 2393 if (debug) 2394 addlog("[mine %s != his %s] ", 2395 sppp_proto_name(sp->hisauth.proto), 2396 sppp_proto_name(authproto)); 2397 p[2] = sp->myauth.proto >> 8; 2398 p[3] = sp->myauth.proto; 2399 break; 2400 } 2401 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2402 if (debug) 2403 addlog("[chap not MD5] "); 2404 p[4] = CHAP_MD5; 2405 break; 2406 } 2407 continue; 2408 } 2409 /* Add the option to nak'ed list. */ 2410 bcopy (p, r, p[1]); 2411 r += p[1]; 2412 rlen += p[1]; 2413 } 2414 if (rlen) { 2415 /* 2416 * Local and remote magics equal -- loopback? 2417 */ 2418 if (sp->pp_loopcnt >= MAXALIVECNT*5) { 2419 if (sp->pp_loopcnt == MAXALIVECNT*5) 2420 printf (SPP_FMT "loopback\n", 2421 SPP_ARGS(ifp)); 2422 if (ifp->if_flags & IFF_UP) { 2423 if_down(ifp); 2424 sppp_qflush(&sp->pp_cpq); 2425 /* XXX ? */ 2426 lcp.Down(sp); 2427 lcp.Up(sp); 2428 } 2429 } else if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2430 if (debug) 2431 addlog(" max_failure (%d) exceeded, " 2432 "send conf-rej\n", 2433 sp->lcp.max_failure); 2434 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2435 } else { 2436 if (debug) 2437 addlog(" send conf-nak\n"); 2438 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2439 } 2440 } else { 2441 if (debug) 2442 addlog(" send conf-ack\n"); 2443 sp->fail_counter[IDX_LCP] = 0; 2444 sp->pp_loopcnt = 0; 2445 sppp_cp_send (sp, PPP_LCP, CONF_ACK, 2446 h->ident, origlen, h+1); 2447 } 2448 2449 free (buf, M_TEMP); 2450 return (rlen == 0); 2451 } 2452 2453 /* 2454 * Analyze the LCP Configure-Reject option list, and adjust our 2455 * negotiation. 2456 */ 2457 static void 2458 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2459 { 2460 STDDCL; 2461 u_char *buf, *p; 2462 2463 len -= 4; 2464 buf = malloc (len, M_TEMP, M_INTWAIT); 2465 2466 if (debug) 2467 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ", 2468 SPP_ARGS(ifp)); 2469 2470 p = (void*) (h+1); 2471 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2472 if (debug) 2473 addlog(" %s ", sppp_lcp_opt_name(*p)); 2474 switch (*p) { 2475 case LCP_OPT_MAGIC: 2476 /* Magic number -- can't use it, use 0 */ 2477 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2478 sp->lcp.magic = 0; 2479 break; 2480 case LCP_OPT_MRU: 2481 /* 2482 * Should not be rejected anyway, since we only 2483 * negotiate a MRU if explicitly requested by 2484 * peer. 2485 */ 2486 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2487 break; 2488 case LCP_OPT_AUTH_PROTO: 2489 /* 2490 * Peer doesn't want to authenticate himself, 2491 * deny unless this is a dialout call, and 2492 * AUTHFLAG_NOCALLOUT is set. 2493 */ 2494 if ((sp->pp_flags & PP_CALLIN) == 0 && 2495 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) { 2496 if (debug) 2497 addlog("[don't insist on auth " 2498 "for callout]"); 2499 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2500 break; 2501 } 2502 if (debug) 2503 addlog("[access denied]\n"); 2504 lcp.Close(sp); 2505 break; 2506 } 2507 } 2508 if (debug) 2509 addlog("\n"); 2510 free (buf, M_TEMP); 2511 return; 2512 } 2513 2514 /* 2515 * Analyze the LCP Configure-NAK option list, and adjust our 2516 * negotiation. 2517 */ 2518 static void 2519 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2520 { 2521 STDDCL; 2522 u_char *buf, *p; 2523 u_long magic; 2524 2525 len -= 4; 2526 buf = malloc (len, M_TEMP, M_INTWAIT); 2527 2528 if (debug) 2529 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ", 2530 SPP_ARGS(ifp)); 2531 2532 p = (void*) (h+1); 2533 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2534 if (debug) 2535 addlog(" %s ", sppp_lcp_opt_name(*p)); 2536 switch (*p) { 2537 case LCP_OPT_MAGIC: 2538 /* Magic number -- renegotiate */ 2539 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2540 len >= 6 && p[1] == 6) { 2541 magic = (u_long)p[2] << 24 | 2542 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 2543 /* 2544 * If the remote magic is our negated one, 2545 * this looks like a loopback problem. 2546 * Suggest a new magic to make sure. 2547 */ 2548 if (magic == ~sp->lcp.magic) { 2549 if (debug) 2550 addlog("magic glitch "); 2551 #if defined(__DragonFly__) 2552 sp->lcp.magic = random(); 2553 #else 2554 sp->lcp.magic = time.tv_sec + time.tv_usec; 2555 #endif 2556 } else { 2557 sp->lcp.magic = magic; 2558 if (debug) 2559 addlog("%lu ", magic); 2560 } 2561 } 2562 break; 2563 case LCP_OPT_MRU: 2564 /* 2565 * Peer wants to advise us to negotiate an MRU. 2566 * Agree on it if it's reasonable, or use 2567 * default otherwise. 2568 */ 2569 if (len >= 4 && p[1] == 4) { 2570 u_int mru = p[2] * 256 + p[3]; 2571 if (debug) 2572 addlog("%d ", mru); 2573 if (mru < PP_MTU || mru > PP_MAX_MRU) 2574 mru = PP_MTU; 2575 sp->lcp.mru = mru; 2576 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2577 } 2578 break; 2579 case LCP_OPT_AUTH_PROTO: 2580 /* 2581 * Peer doesn't like our authentication method, 2582 * deny. 2583 */ 2584 if (debug) 2585 addlog("[access denied]\n"); 2586 lcp.Close(sp); 2587 break; 2588 } 2589 } 2590 if (debug) 2591 addlog("\n"); 2592 free (buf, M_TEMP); 2593 return; 2594 } 2595 2596 static void 2597 sppp_lcp_tlu(struct sppp *sp) 2598 { 2599 STDDCL; 2600 int i; 2601 u_long mask; 2602 2603 /* XXX ? */ 2604 if (! (ifp->if_flags & IFF_UP) && 2605 (ifp->if_flags & IFF_RUNNING)) { 2606 /* Coming out of loopback mode. */ 2607 if_up(ifp); 2608 printf (SPP_FMT "up\n", SPP_ARGS(ifp)); 2609 } 2610 2611 for (i = 0; i < IDX_COUNT; i++) 2612 if ((cps[i])->flags & CP_QUAL) 2613 (cps[i])->Open(sp); 2614 2615 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2616 (sp->pp_flags & PP_NEEDAUTH) != 0) 2617 sp->pp_phase = PHASE_AUTHENTICATE; 2618 else 2619 sp->pp_phase = PHASE_NETWORK; 2620 2621 if (debug) 2622 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2623 sppp_phase_name(sp->pp_phase)); 2624 2625 /* 2626 * Open all authentication protocols. This is even required 2627 * if we already proceeded to network phase, since it might be 2628 * that remote wants us to authenticate, so we might have to 2629 * send a PAP request. Undesired authentication protocols 2630 * don't do anything when they get an Open event. 2631 */ 2632 for (i = 0; i < IDX_COUNT; i++) 2633 if ((cps[i])->flags & CP_AUTH) 2634 (cps[i])->Open(sp); 2635 2636 if (sp->pp_phase == PHASE_NETWORK) { 2637 /* Notify all NCPs. */ 2638 for (i = 0; i < IDX_COUNT; i++) 2639 if (((cps[i])->flags & CP_NCP) && 2640 /* 2641 * XXX 2642 * Hack to administratively disable IPv6 if 2643 * not desired. Perhaps we should have another 2644 * flag for this, but right now, we can make 2645 * all struct cp's read/only. 2646 */ 2647 (cps[i] != &ipv6cp || 2648 (sp->confflags & CONF_ENABLE_IPV6))) 2649 (cps[i])->Open(sp); 2650 } 2651 2652 /* Send Up events to all started protos. */ 2653 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2654 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2655 (cps[i])->Up(sp); 2656 2657 /* notify low-level driver of state change */ 2658 if (sp->pp_chg) 2659 sp->pp_chg(sp, (int)sp->pp_phase); 2660 2661 if (sp->pp_phase == PHASE_NETWORK) 2662 /* if no NCP is starting, close down */ 2663 sppp_lcp_check_and_close(sp); 2664 } 2665 2666 static void 2667 sppp_lcp_tld(struct sppp *sp) 2668 { 2669 STDDCL; 2670 int i; 2671 u_long mask; 2672 2673 sp->pp_phase = PHASE_TERMINATE; 2674 2675 if (debug) 2676 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2677 sppp_phase_name(sp->pp_phase)); 2678 2679 /* 2680 * Take upper layers down. We send the Down event first and 2681 * the Close second to prevent the upper layers from sending 2682 * ``a flurry of terminate-request packets'', as the RFC 2683 * describes it. 2684 */ 2685 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2686 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2687 (cps[i])->Down(sp); 2688 (cps[i])->Close(sp); 2689 } 2690 } 2691 2692 static void 2693 sppp_lcp_tls(struct sppp *sp) 2694 { 2695 STDDCL; 2696 2697 sp->pp_phase = PHASE_ESTABLISH; 2698 2699 if (debug) 2700 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2701 sppp_phase_name(sp->pp_phase)); 2702 2703 /* Notify lower layer if desired. */ 2704 if (sp->pp_tls) 2705 (sp->pp_tls)(sp); 2706 else 2707 (sp->pp_up)(sp); 2708 } 2709 2710 static void 2711 sppp_lcp_tlf(struct sppp *sp) 2712 { 2713 STDDCL; 2714 2715 sp->pp_phase = PHASE_DEAD; 2716 if (debug) 2717 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2718 sppp_phase_name(sp->pp_phase)); 2719 2720 /* Notify lower layer if desired. */ 2721 if (sp->pp_tlf) 2722 (sp->pp_tlf)(sp); 2723 else 2724 (sp->pp_down)(sp); 2725 } 2726 2727 static void 2728 sppp_lcp_scr(struct sppp *sp) 2729 { 2730 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2731 int i = 0; 2732 u_short authproto; 2733 2734 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2735 if (! sp->lcp.magic) 2736 #if defined(__DragonFly__) 2737 sp->lcp.magic = random(); 2738 #else 2739 sp->lcp.magic = time.tv_sec + time.tv_usec; 2740 #endif 2741 opt[i++] = LCP_OPT_MAGIC; 2742 opt[i++] = 6; 2743 opt[i++] = sp->lcp.magic >> 24; 2744 opt[i++] = sp->lcp.magic >> 16; 2745 opt[i++] = sp->lcp.magic >> 8; 2746 opt[i++] = sp->lcp.magic; 2747 } 2748 2749 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2750 opt[i++] = LCP_OPT_MRU; 2751 opt[i++] = 4; 2752 opt[i++] = sp->lcp.mru >> 8; 2753 opt[i++] = sp->lcp.mru; 2754 } 2755 2756 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2757 authproto = sp->hisauth.proto; 2758 opt[i++] = LCP_OPT_AUTH_PROTO; 2759 opt[i++] = authproto == PPP_CHAP? 5: 4; 2760 opt[i++] = authproto >> 8; 2761 opt[i++] = authproto; 2762 if (authproto == PPP_CHAP) 2763 opt[i++] = CHAP_MD5; 2764 } 2765 2766 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2767 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2768 } 2769 2770 /* 2771 * Check the open NCPs, return true if at least one NCP is open. 2772 */ 2773 static int 2774 sppp_ncp_check(struct sppp *sp) 2775 { 2776 int i, mask; 2777 2778 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2779 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2780 return 1; 2781 return 0; 2782 } 2783 2784 /* 2785 * Re-check the open NCPs and see if we should terminate the link. 2786 * Called by the NCPs during their tlf action handling. 2787 */ 2788 static void 2789 sppp_lcp_check_and_close(struct sppp *sp) 2790 { 2791 2792 if (sp->pp_phase < PHASE_NETWORK) 2793 /* don't bother, we are already going down */ 2794 return; 2795 2796 if (sppp_ncp_check(sp)) 2797 return; 2798 2799 lcp.Close(sp); 2800 } 2801 2802 /* 2803 *--------------------------------------------------------------------------* 2804 * * 2805 * The IPCP implementation. * 2806 * * 2807 *--------------------------------------------------------------------------* 2808 */ 2809 2810 static void 2811 sppp_ipcp_init(struct sppp *sp) 2812 { 2813 sp->ipcp.opts = 0; 2814 sp->ipcp.flags = 0; 2815 sp->state[IDX_IPCP] = STATE_INITIAL; 2816 sp->fail_counter[IDX_IPCP] = 0; 2817 sp->pp_seq[IDX_IPCP] = 0; 2818 sp->pp_rseq[IDX_IPCP] = 0; 2819 #if defined(__DragonFly__) 2820 callout_handle_init(&sp->ch[IDX_IPCP]); 2821 #endif 2822 } 2823 2824 static void 2825 sppp_ipcp_up(struct sppp *sp) 2826 { 2827 sppp_up_event(&ipcp, sp); 2828 } 2829 2830 static void 2831 sppp_ipcp_down(struct sppp *sp) 2832 { 2833 sppp_down_event(&ipcp, sp); 2834 } 2835 2836 static void 2837 sppp_ipcp_open(struct sppp *sp) 2838 { 2839 STDDCL; 2840 u_long myaddr, hisaddr; 2841 2842 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN | 2843 IPCP_MYADDR_DYN | IPCP_VJ); 2844 sp->ipcp.opts = 0; 2845 2846 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2847 /* 2848 * If we don't have his address, this probably means our 2849 * interface doesn't want to talk IP at all. (This could 2850 * be the case if somebody wants to speak only IPX, for 2851 * example.) Don't open IPCP in this case. 2852 */ 2853 if (hisaddr == 0L) { 2854 /* XXX this message should go away */ 2855 if (debug) 2856 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n", 2857 SPP_ARGS(ifp)); 2858 return; 2859 } 2860 if (myaddr == 0L) { 2861 /* 2862 * I don't have an assigned address, so i need to 2863 * negotiate my address. 2864 */ 2865 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2866 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2867 } else 2868 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 2869 if (sp->confflags & CONF_ENABLE_VJ) { 2870 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION); 2871 sp->ipcp.max_state = MAX_STATES - 1; 2872 sp->ipcp.compress_cid = 1; 2873 } 2874 sppp_open_event(&ipcp, sp); 2875 } 2876 2877 static void 2878 sppp_ipcp_close(struct sppp *sp) 2879 { 2880 sppp_close_event(&ipcp, sp); 2881 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 2882 /* 2883 * My address was dynamic, clear it again. 2884 */ 2885 sppp_set_ip_addr(sp, 0L); 2886 } 2887 2888 static void 2889 sppp_ipcp_TO(void *cookie) 2890 { 2891 sppp_to_event(&ipcp, (struct sppp *)cookie); 2892 } 2893 2894 /* 2895 * Analyze a configure request. Return true if it was agreeable, and 2896 * caused action sca, false if it has been rejected or nak'ed, and 2897 * caused action scn. (The return value is used to make the state 2898 * transition decision in the state automaton.) 2899 */ 2900 static int 2901 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2902 { 2903 u_char *buf, *r, *p; 2904 struct ifnet *ifp = &sp->pp_if; 2905 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2906 u_long hisaddr, desiredaddr; 2907 int gotmyaddr = 0; 2908 int desiredcomp; 2909 2910 len -= 4; 2911 origlen = len; 2912 /* 2913 * Make sure to allocate a buf that can at least hold a 2914 * conf-nak with an `address' option. We might need it below. 2915 */ 2916 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_INTWAIT); 2917 2918 /* pass 1: see if we can recognize them */ 2919 if (debug) 2920 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ", 2921 SPP_ARGS(ifp)); 2922 p = (void*) (h+1); 2923 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2924 if (debug) 2925 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2926 switch (*p) { 2927 case IPCP_OPT_COMPRESSION: 2928 if (!(sp->confflags & CONF_ENABLE_VJ)) { 2929 /* VJ compression administratively disabled */ 2930 if (debug) 2931 addlog("[locally disabled] "); 2932 break; 2933 } 2934 /* 2935 * In theory, we should only conf-rej an 2936 * option that is shorter than RFC 1618 2937 * requires (i.e. < 4), and should conf-nak 2938 * anything else that is not VJ. However, 2939 * since our algorithm always uses the 2940 * original option to NAK it with new values, 2941 * things would become more complicated. In 2942 * pratice, the only commonly implemented IP 2943 * compression option is VJ anyway, so the 2944 * difference is negligible. 2945 */ 2946 if (len >= 6 && p[1] == 6) { 2947 /* 2948 * correctly formed compression option 2949 * that could be VJ compression 2950 */ 2951 continue; 2952 } 2953 if (debug) 2954 addlog("optlen %d [invalid/unsupported] ", 2955 p[1]); 2956 break; 2957 case IPCP_OPT_ADDRESS: 2958 if (len >= 6 && p[1] == 6) { 2959 /* correctly formed address option */ 2960 continue; 2961 } 2962 if (debug) 2963 addlog("[invalid] "); 2964 break; 2965 default: 2966 /* Others not supported. */ 2967 if (debug) 2968 addlog("[rej] "); 2969 break; 2970 } 2971 /* Add the option to rejected list. */ 2972 bcopy (p, r, p[1]); 2973 r += p[1]; 2974 rlen += p[1]; 2975 } 2976 if (rlen) { 2977 if (debug) 2978 addlog(" send conf-rej\n"); 2979 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2980 return 0; 2981 } else if (debug) 2982 addlog("\n"); 2983 2984 /* pass 2: parse option values */ 2985 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); 2986 if (debug) 2987 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ", 2988 SPP_ARGS(ifp)); 2989 p = (void*) (h+1); 2990 len = origlen; 2991 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2992 if (debug) 2993 addlog(" %s ", sppp_ipcp_opt_name(*p)); 2994 switch (*p) { 2995 case IPCP_OPT_COMPRESSION: 2996 desiredcomp = p[2] << 8 | p[3]; 2997 /* We only support VJ */ 2998 if (desiredcomp == IPCP_COMP_VJ) { 2999 if (debug) 3000 addlog("VJ [ack] "); 3001 sp->ipcp.flags |= IPCP_VJ; 3002 sl_compress_init(sp->pp_comp, p[4]); 3003 sp->ipcp.max_state = p[4]; 3004 sp->ipcp.compress_cid = p[5]; 3005 continue; 3006 } 3007 if (debug) 3008 addlog("compproto %#04x [not supported] ", 3009 desiredcomp); 3010 p[2] = IPCP_COMP_VJ >> 8; 3011 p[3] = IPCP_COMP_VJ; 3012 p[4] = sp->ipcp.max_state; 3013 p[5] = sp->ipcp.compress_cid; 3014 break; 3015 case IPCP_OPT_ADDRESS: 3016 /* This is the address he wants in his end */ 3017 desiredaddr = p[2] << 24 | p[3] << 16 | 3018 p[4] << 8 | p[5]; 3019 if (desiredaddr == hisaddr || 3020 (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) { 3021 /* 3022 * Peer's address is same as our value, 3023 * or we have set it to 0.0.0.* to 3024 * indicate that we do not really care, 3025 * this is agreeable. Gonna conf-ack 3026 * it. 3027 */ 3028 if (debug) 3029 addlog("%s [ack] ", 3030 sppp_dotted_quad(hisaddr)); 3031 /* record that we've seen it already */ 3032 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 3033 continue; 3034 } 3035 /* 3036 * The address wasn't agreeable. This is either 3037 * he sent us 0.0.0.0, asking to assign him an 3038 * address, or he send us another address not 3039 * matching our value. Either case, we gonna 3040 * conf-nak it with our value. 3041 * XXX: we should "rej" if hisaddr == 0 3042 */ 3043 if (debug) { 3044 if (desiredaddr == 0) 3045 addlog("[addr requested] "); 3046 else 3047 addlog("%s [not agreed] ", 3048 sppp_dotted_quad(desiredaddr)); 3049 3050 } 3051 p[2] = hisaddr >> 24; 3052 p[3] = hisaddr >> 16; 3053 p[4] = hisaddr >> 8; 3054 p[5] = hisaddr; 3055 break; 3056 } 3057 /* Add the option to nak'ed list. */ 3058 bcopy (p, r, p[1]); 3059 r += p[1]; 3060 rlen += p[1]; 3061 } 3062 3063 /* 3064 * If we are about to conf-ack the request, but haven't seen 3065 * his address so far, gonna conf-nak it instead, with the 3066 * `address' option present and our idea of his address being 3067 * filled in there, to request negotiation of both addresses. 3068 * 3069 * XXX This can result in an endless req - nak loop if peer 3070 * doesn't want to send us his address. Q: What should we do 3071 * about it? XXX A: implement the max-failure counter. 3072 */ 3073 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) { 3074 buf[0] = IPCP_OPT_ADDRESS; 3075 buf[1] = 6; 3076 buf[2] = hisaddr >> 24; 3077 buf[3] = hisaddr >> 16; 3078 buf[4] = hisaddr >> 8; 3079 buf[5] = hisaddr; 3080 rlen = 6; 3081 if (debug) 3082 addlog("still need hisaddr "); 3083 } 3084 3085 if (rlen) { 3086 if (debug) 3087 addlog(" send conf-nak\n"); 3088 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 3089 } else { 3090 if (debug) 3091 addlog(" send conf-ack\n"); 3092 sppp_cp_send (sp, PPP_IPCP, CONF_ACK, 3093 h->ident, origlen, h+1); 3094 } 3095 3096 free (buf, M_TEMP); 3097 return (rlen == 0); 3098 } 3099 3100 /* 3101 * Analyze the IPCP Configure-Reject option list, and adjust our 3102 * negotiation. 3103 */ 3104 static void 3105 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3106 { 3107 u_char *buf, *p; 3108 struct ifnet *ifp = &sp->pp_if; 3109 int debug = ifp->if_flags & IFF_DEBUG; 3110 3111 len -= 4; 3112 buf = malloc (len, M_TEMP, M_INTWAIT); 3113 3114 if (debug) 3115 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ", 3116 SPP_ARGS(ifp)); 3117 3118 p = (void*) (h+1); 3119 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3120 if (debug) 3121 addlog(" %s ", sppp_ipcp_opt_name(*p)); 3122 switch (*p) { 3123 case IPCP_OPT_COMPRESSION: 3124 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION); 3125 break; 3126 case IPCP_OPT_ADDRESS: 3127 /* 3128 * Peer doesn't grok address option. This is 3129 * bad. XXX Should we better give up here? 3130 * XXX We could try old "addresses" option... 3131 */ 3132 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3133 break; 3134 } 3135 } 3136 if (debug) 3137 addlog("\n"); 3138 free (buf, M_TEMP); 3139 return; 3140 } 3141 3142 /* 3143 * Analyze the IPCP Configure-NAK option list, and adjust our 3144 * negotiation. 3145 */ 3146 static void 3147 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3148 { 3149 u_char *buf, *p; 3150 struct ifnet *ifp = &sp->pp_if; 3151 int debug = ifp->if_flags & IFF_DEBUG; 3152 int desiredcomp; 3153 u_long wantaddr; 3154 3155 len -= 4; 3156 buf = malloc (len, M_TEMP, M_INTWAIT); 3157 3158 if (debug) 3159 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ", 3160 SPP_ARGS(ifp)); 3161 3162 p = (void*) (h+1); 3163 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3164 if (debug) 3165 addlog(" %s ", sppp_ipcp_opt_name(*p)); 3166 switch (*p) { 3167 case IPCP_OPT_COMPRESSION: 3168 if (len >= 6 && p[1] == 6) { 3169 desiredcomp = p[2] << 8 | p[3]; 3170 if (debug) 3171 addlog("[wantcomp %#04x] ", 3172 desiredcomp); 3173 if (desiredcomp == IPCP_COMP_VJ) { 3174 sl_compress_init(sp->pp_comp, p[4]); 3175 sp->ipcp.max_state = p[4]; 3176 sp->ipcp.compress_cid = p[5]; 3177 if (debug) 3178 addlog("[agree] "); 3179 } else 3180 sp->ipcp.opts &= 3181 ~(1 << IPCP_OPT_COMPRESSION); 3182 } 3183 break; 3184 case IPCP_OPT_ADDRESS: 3185 /* 3186 * Peer doesn't like our local IP address. See 3187 * if we can do something for him. We'll drop 3188 * him our address then. 3189 */ 3190 if (len >= 6 && p[1] == 6) { 3191 wantaddr = p[2] << 24 | p[3] << 16 | 3192 p[4] << 8 | p[5]; 3193 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3194 if (debug) 3195 addlog("[wantaddr %s] ", 3196 sppp_dotted_quad(wantaddr)); 3197 /* 3198 * When doing dynamic address assignment, 3199 * we accept his offer. Otherwise, we 3200 * ignore it and thus continue to negotiate 3201 * our already existing value. 3202 * XXX: Bogus, if he said no once, he'll 3203 * just say no again, might as well die. 3204 */ 3205 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3206 sppp_set_ip_addr(sp, wantaddr); 3207 if (debug) 3208 addlog("[agree] "); 3209 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3210 } 3211 } 3212 break; 3213 } 3214 } 3215 if (debug) 3216 addlog("\n"); 3217 free (buf, M_TEMP); 3218 return; 3219 } 3220 3221 static void 3222 sppp_ipcp_tlu(struct sppp *sp) 3223 { 3224 /* we are up - notify isdn daemon */ 3225 if (sp->pp_con) 3226 sp->pp_con(sp); 3227 } 3228 3229 static void 3230 sppp_ipcp_tld(struct sppp *sp) 3231 { 3232 } 3233 3234 static void 3235 sppp_ipcp_tls(struct sppp *sp) 3236 { 3237 /* indicate to LCP that it must stay alive */ 3238 sp->lcp.protos |= (1 << IDX_IPCP); 3239 } 3240 3241 static void 3242 sppp_ipcp_tlf(struct sppp *sp) 3243 { 3244 /* we no longer need LCP */ 3245 sp->lcp.protos &= ~(1 << IDX_IPCP); 3246 sppp_lcp_check_and_close(sp); 3247 } 3248 3249 static void 3250 sppp_ipcp_scr(struct sppp *sp) 3251 { 3252 char opt[6 /* compression */ + 6 /* address */]; 3253 u_long ouraddr; 3254 int i = 0; 3255 3256 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3257 opt[i++] = IPCP_OPT_COMPRESSION; 3258 opt[i++] = 6; 3259 opt[i++] = IPCP_COMP_VJ >> 8; 3260 opt[i++] = IPCP_COMP_VJ; 3261 opt[i++] = sp->ipcp.max_state; 3262 opt[i++] = sp->ipcp.compress_cid; 3263 } 3264 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3265 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3266 opt[i++] = IPCP_OPT_ADDRESS; 3267 opt[i++] = 6; 3268 opt[i++] = ouraddr >> 24; 3269 opt[i++] = ouraddr >> 16; 3270 opt[i++] = ouraddr >> 8; 3271 opt[i++] = ouraddr; 3272 } 3273 3274 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3275 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3276 } 3277 3278 /* 3279 *--------------------------------------------------------------------------* 3280 * * 3281 * The IPv6CP implementation. * 3282 * * 3283 *--------------------------------------------------------------------------* 3284 */ 3285 3286 #ifdef INET6 3287 static void 3288 sppp_ipv6cp_init(struct sppp *sp) 3289 { 3290 sp->ipv6cp.opts = 0; 3291 sp->ipv6cp.flags = 0; 3292 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3293 sp->fail_counter[IDX_IPV6CP] = 0; 3294 sp->pp_seq[IDX_IPV6CP] = 0; 3295 sp->pp_rseq[IDX_IPV6CP] = 0; 3296 #if defined(__NetBSD__) 3297 callout_init(&sp->ch[IDX_IPV6CP]); 3298 #endif 3299 #if defined(__DragonFly__) 3300 callout_handle_init(&sp->ch[IDX_IPV6CP]); 3301 #endif 3302 } 3303 3304 static void 3305 sppp_ipv6cp_up(struct sppp *sp) 3306 { 3307 sppp_up_event(&ipv6cp, sp); 3308 } 3309 3310 static void 3311 sppp_ipv6cp_down(struct sppp *sp) 3312 { 3313 sppp_down_event(&ipv6cp, sp); 3314 } 3315 3316 static void 3317 sppp_ipv6cp_open(struct sppp *sp) 3318 { 3319 STDDCL; 3320 struct in6_addr myaddr, hisaddr; 3321 3322 #ifdef IPV6CP_MYIFID_DYN 3323 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3324 #else 3325 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3326 #endif 3327 3328 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3329 /* 3330 * If we don't have our address, this probably means our 3331 * interface doesn't want to talk IPv6 at all. (This could 3332 * be the case if somebody wants to speak only IPX, for 3333 * example.) Don't open IPv6CP in this case. 3334 */ 3335 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3336 /* XXX this message should go away */ 3337 if (debug) 3338 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n", 3339 SPP_ARGS(ifp)); 3340 return; 3341 } 3342 3343 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3344 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3345 sppp_open_event(&ipv6cp, sp); 3346 } 3347 3348 static void 3349 sppp_ipv6cp_close(struct sppp *sp) 3350 { 3351 sppp_close_event(&ipv6cp, sp); 3352 } 3353 3354 static void 3355 sppp_ipv6cp_TO(void *cookie) 3356 { 3357 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3358 } 3359 3360 /* 3361 * Analyze a configure request. Return true if it was agreeable, and 3362 * caused action sca, false if it has been rejected or nak'ed, and 3363 * caused action scn. (The return value is used to make the state 3364 * transition decision in the state automaton.) 3365 */ 3366 static int 3367 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3368 { 3369 u_char *buf, *r, *p; 3370 struct ifnet *ifp = &sp->pp_if; 3371 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3372 struct in6_addr myaddr, desiredaddr, suggestaddr; 3373 int ifidcount; 3374 int type; 3375 int collision, nohisaddr; 3376 3377 len -= 4; 3378 origlen = len; 3379 /* 3380 * Make sure to allocate a buf that can at least hold a 3381 * conf-nak with an `address' option. We might need it below. 3382 */ 3383 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_INTWAIT); 3384 3385 /* pass 1: see if we can recognize them */ 3386 if (debug) 3387 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:", 3388 SPP_ARGS(ifp)); 3389 p = (void*) (h+1); 3390 ifidcount = 0; 3391 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3392 if (debug) 3393 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3394 switch (*p) { 3395 case IPV6CP_OPT_IFID: 3396 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3397 /* correctly formed address option */ 3398 ifidcount++; 3399 continue; 3400 } 3401 if (debug) 3402 addlog(" [invalid]"); 3403 break; 3404 #ifdef notyet 3405 case IPV6CP_OPT_COMPRESSION: 3406 if (len >= 4 && p[1] >= 4) { 3407 /* correctly formed compress option */ 3408 continue; 3409 } 3410 if (debug) 3411 addlog(" [invalid]"); 3412 break; 3413 #endif 3414 default: 3415 /* Others not supported. */ 3416 if (debug) 3417 addlog(" [rej]"); 3418 break; 3419 } 3420 /* Add the option to rejected list. */ 3421 bcopy (p, r, p[1]); 3422 r += p[1]; 3423 rlen += p[1]; 3424 } 3425 if (rlen) { 3426 if (debug) 3427 addlog(" send conf-rej\n"); 3428 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3429 goto end; 3430 } else if (debug) 3431 addlog("\n"); 3432 3433 /* pass 2: parse option values */ 3434 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3435 if (debug) 3436 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ", 3437 SPP_ARGS(ifp)); 3438 p = (void*) (h+1); 3439 len = origlen; 3440 type = CONF_ACK; 3441 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3442 if (debug) 3443 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3444 switch (*p) { 3445 #ifdef notyet 3446 case IPV6CP_OPT_COMPRESSION: 3447 continue; 3448 #endif 3449 case IPV6CP_OPT_IFID: 3450 bzero(&desiredaddr, sizeof(desiredaddr)); 3451 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3452 collision = (bcmp(&desiredaddr.s6_addr[8], 3453 &myaddr.s6_addr[8], 8) == 0); 3454 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3455 3456 desiredaddr.s6_addr16[0] = htons(0xfe80); 3457 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3458 3459 if (!collision && !nohisaddr) { 3460 /* no collision, hisaddr known - Conf-Ack */ 3461 type = CONF_ACK; 3462 3463 if (debug) { 3464 addlog(" %s [%s]", 3465 ip6_sprintf(&desiredaddr), 3466 sppp_cp_type_name(type)); 3467 } 3468 continue; 3469 } 3470 3471 bzero(&suggestaddr, sizeof(&suggestaddr)); 3472 if (collision && nohisaddr) { 3473 /* collision, hisaddr unknown - Conf-Rej */ 3474 type = CONF_REJ; 3475 bzero(&p[2], 8); 3476 } else { 3477 /* 3478 * - no collision, hisaddr unknown, or 3479 * - collision, hisaddr known 3480 * Conf-Nak, suggest hisaddr 3481 */ 3482 type = CONF_NAK; 3483 sppp_suggest_ip6_addr(sp, &suggestaddr); 3484 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3485 } 3486 if (debug) 3487 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3488 sppp_cp_type_name(type)); 3489 break; 3490 } 3491 /* Add the option to nak'ed list. */ 3492 bcopy (p, r, p[1]); 3493 r += p[1]; 3494 rlen += p[1]; 3495 } 3496 3497 if (rlen == 0 && type == CONF_ACK) { 3498 if (debug) 3499 addlog(" send %s\n", sppp_cp_type_name(type)); 3500 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1); 3501 } else { 3502 #ifdef DIAGNOSTIC 3503 if (type == CONF_ACK) 3504 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3505 #endif 3506 3507 if (debug) { 3508 addlog(" send %s suggest %s\n", 3509 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3510 } 3511 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3512 } 3513 3514 end: 3515 free (buf, M_TEMP); 3516 return (rlen == 0); 3517 } 3518 3519 /* 3520 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3521 * negotiation. 3522 */ 3523 static void 3524 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3525 { 3526 u_char *buf, *p; 3527 struct ifnet *ifp = &sp->pp_if; 3528 int debug = ifp->if_flags & IFF_DEBUG; 3529 3530 len -= 4; 3531 buf = malloc (len, M_TEMP, M_INTWAIT); 3532 3533 if (debug) 3534 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:", 3535 SPP_ARGS(ifp)); 3536 3537 p = (void*) (h+1); 3538 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3539 if (debug) 3540 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3541 switch (*p) { 3542 case IPV6CP_OPT_IFID: 3543 /* 3544 * Peer doesn't grok address option. This is 3545 * bad. XXX Should we better give up here? 3546 */ 3547 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3548 break; 3549 #ifdef notyet 3550 case IPV6CP_OPT_COMPRESS: 3551 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3552 break; 3553 #endif 3554 } 3555 } 3556 if (debug) 3557 addlog("\n"); 3558 free (buf, M_TEMP); 3559 return; 3560 } 3561 3562 /* 3563 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3564 * negotiation. 3565 */ 3566 static void 3567 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3568 { 3569 u_char *buf, *p; 3570 struct ifnet *ifp = &sp->pp_if; 3571 int debug = ifp->if_flags & IFF_DEBUG; 3572 struct in6_addr suggestaddr; 3573 3574 len -= 4; 3575 buf = malloc (len, M_TEMP, M_INTWAIT); 3576 3577 if (debug) 3578 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:", 3579 SPP_ARGS(ifp)); 3580 3581 p = (void*) (h+1); 3582 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3583 if (debug) 3584 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3585 switch (*p) { 3586 case IPV6CP_OPT_IFID: 3587 /* 3588 * Peer doesn't like our local ifid. See 3589 * if we can do something for him. We'll drop 3590 * him our address then. 3591 */ 3592 if (len < 10 || p[1] != 10) 3593 break; 3594 bzero(&suggestaddr, sizeof(suggestaddr)); 3595 suggestaddr.s6_addr16[0] = htons(0xfe80); 3596 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3597 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3598 3599 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3600 if (debug) 3601 addlog(" [suggestaddr %s]", 3602 ip6_sprintf(&suggestaddr)); 3603 #ifdef IPV6CP_MYIFID_DYN 3604 /* 3605 * When doing dynamic address assignment, 3606 * we accept his offer. 3607 */ 3608 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3609 struct in6_addr lastsuggest; 3610 /* 3611 * If <suggested myaddr from peer> equals to 3612 * <hisaddr we have suggested last time>, 3613 * we have a collision. generate new random 3614 * ifid. 3615 */ 3616 sppp_suggest_ip6_addr(&lastsuggest); 3617 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3618 lastsuggest)) { 3619 if (debug) 3620 addlog(" [random]"); 3621 sppp_gen_ip6_addr(sp, &suggestaddr); 3622 } 3623 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3624 if (debug) 3625 addlog(" [agree]"); 3626 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3627 } 3628 #else 3629 /* 3630 * Since we do not do dynamic address assignment, 3631 * we ignore it and thus continue to negotiate 3632 * our already existing value. This can possibly 3633 * go into infinite request-reject loop. 3634 * 3635 * This is not likely because we normally use 3636 * ifid based on MAC-address. 3637 * If you have no ethernet card on the node, too bad. 3638 * XXX should we use fail_counter? 3639 */ 3640 #endif 3641 break; 3642 #ifdef notyet 3643 case IPV6CP_OPT_COMPRESS: 3644 /* 3645 * Peer wants different compression parameters. 3646 */ 3647 break; 3648 #endif 3649 } 3650 } 3651 if (debug) 3652 addlog("\n"); 3653 free (buf, M_TEMP); 3654 return; 3655 } 3656 static void 3657 sppp_ipv6cp_tlu(struct sppp *sp) 3658 { 3659 /* we are up - notify isdn daemon */ 3660 if (sp->pp_con) 3661 sp->pp_con(sp); 3662 } 3663 3664 static void 3665 sppp_ipv6cp_tld(struct sppp *sp) 3666 { 3667 } 3668 3669 static void 3670 sppp_ipv6cp_tls(struct sppp *sp) 3671 { 3672 /* indicate to LCP that it must stay alive */ 3673 sp->lcp.protos |= (1 << IDX_IPV6CP); 3674 } 3675 3676 static void 3677 sppp_ipv6cp_tlf(struct sppp *sp) 3678 { 3679 3680 #if 0 /* need #if 0 to close IPv6CP properly */ 3681 /* we no longer need LCP */ 3682 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3683 sppp_lcp_check_and_close(sp); 3684 #endif 3685 } 3686 3687 static void 3688 sppp_ipv6cp_scr(struct sppp *sp) 3689 { 3690 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3691 struct in6_addr ouraddr; 3692 int i = 0; 3693 3694 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3695 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3696 opt[i++] = IPV6CP_OPT_IFID; 3697 opt[i++] = 10; 3698 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3699 i += 8; 3700 } 3701 3702 #ifdef notyet 3703 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3704 opt[i++] = IPV6CP_OPT_COMPRESSION; 3705 opt[i++] = 4; 3706 opt[i++] = 0; /* TBD */ 3707 opt[i++] = 0; /* TBD */ 3708 /* variable length data may follow */ 3709 } 3710 #endif 3711 3712 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3713 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3714 } 3715 #else /*INET6*/ 3716 static void sppp_ipv6cp_init(struct sppp *sp) 3717 { 3718 } 3719 3720 static void sppp_ipv6cp_up(struct sppp *sp) 3721 { 3722 } 3723 3724 static void sppp_ipv6cp_down(struct sppp *sp) 3725 { 3726 } 3727 3728 3729 static void sppp_ipv6cp_open(struct sppp *sp) 3730 { 3731 } 3732 3733 static void sppp_ipv6cp_close(struct sppp *sp) 3734 { 3735 } 3736 3737 static void sppp_ipv6cp_TO(void *sp) 3738 { 3739 } 3740 3741 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3742 { 3743 return 0; 3744 } 3745 3746 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3747 { 3748 } 3749 3750 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3751 { 3752 } 3753 3754 static void sppp_ipv6cp_tlu(struct sppp *sp) 3755 { 3756 } 3757 3758 static void sppp_ipv6cp_tld(struct sppp *sp) 3759 { 3760 } 3761 3762 static void sppp_ipv6cp_tls(struct sppp *sp) 3763 { 3764 } 3765 3766 static void sppp_ipv6cp_tlf(struct sppp *sp) 3767 { 3768 } 3769 3770 static void sppp_ipv6cp_scr(struct sppp *sp) 3771 { 3772 } 3773 #endif /*INET6*/ 3774 3775 /* 3776 *--------------------------------------------------------------------------* 3777 * * 3778 * The CHAP implementation. * 3779 * * 3780 *--------------------------------------------------------------------------* 3781 */ 3782 3783 /* 3784 * The authentication protocols don't employ a full-fledged state machine as 3785 * the control protocols do, since they do have Open and Close events, but 3786 * not Up and Down, nor are they explicitly terminated. Also, use of the 3787 * authentication protocols may be different in both directions (this makes 3788 * sense, think of a machine that never accepts incoming calls but only 3789 * calls out, it doesn't require the called party to authenticate itself). 3790 * 3791 * Our state machine for the local authentication protocol (we are requesting 3792 * the peer to authenticate) looks like: 3793 * 3794 * RCA- 3795 * +--------------------------------------------+ 3796 * V scn,tld| 3797 * +--------+ Close +---------+ RCA+ 3798 * | |<----------------------------------| |------+ 3799 * +--->| Closed | TO* | Opened | sca | 3800 * | | |-----+ +-------| |<-----+ 3801 * | +--------+ irc | | +---------+ 3802 * | ^ | | ^ 3803 * | | | | | 3804 * | | | | | 3805 * | TO-| | | | 3806 * | |tld TO+ V | | 3807 * | | +------->+ | | 3808 * | | | | | | 3809 * | +--------+ V | | 3810 * | | |<----+<--------------------+ | 3811 * | | Req- | scr | 3812 * | | Sent | | 3813 * | | | | 3814 * | +--------+ | 3815 * | RCA- | | RCA+ | 3816 * +------+ +------------------------------------------+ 3817 * scn,tld sca,irc,ict,tlu 3818 * 3819 * 3820 * with: 3821 * 3822 * Open: LCP reached authentication phase 3823 * Close: LCP reached terminate phase 3824 * 3825 * RCA+: received reply (pap-req, chap-response), acceptable 3826 * RCN: received reply (pap-req, chap-response), not acceptable 3827 * TO+: timeout with restart counter >= 0 3828 * TO-: timeout with restart counter < 0 3829 * TO*: reschedule timeout for CHAP 3830 * 3831 * scr: send request packet (none for PAP, chap-challenge) 3832 * sca: send ack packet (pap-ack, chap-success) 3833 * scn: send nak packet (pap-nak, chap-failure) 3834 * ict: initialize re-challenge timer (CHAP only) 3835 * 3836 * tlu: this-layer-up, LCP reaches network phase 3837 * tld: this-layer-down, LCP enters terminate phase 3838 * 3839 * Note that in CHAP mode, after sending a new challenge, while the state 3840 * automaton falls back into Req-Sent state, it doesn't signal a tld 3841 * event to LCP, so LCP remains in network phase. Only after not getting 3842 * any response (or after getting an unacceptable response), CHAP closes, 3843 * causing LCP to enter terminate phase. 3844 * 3845 * With PAP, there is no initial request that can be sent. The peer is 3846 * expected to send one based on the successful negotiation of PAP as 3847 * the authentication protocol during the LCP option negotiation. 3848 * 3849 * Incoming authentication protocol requests (remote requests 3850 * authentication, we are peer) don't employ a state machine at all, 3851 * they are simply answered. Some peers [Ascend P50 firmware rev 3852 * 4.50] react allergically when sending IPCP requests while they are 3853 * still in authentication phase (thereby violating the standard that 3854 * demands that these NCP packets are to be discarded), so we keep 3855 * track of the peer demanding us to authenticate, and only proceed to 3856 * phase network once we've seen a positive acknowledge for the 3857 * authentication. 3858 */ 3859 3860 /* 3861 * Handle incoming CHAP packets. 3862 */ 3863 void 3864 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3865 { 3866 STDDCL; 3867 struct lcp_header *h; 3868 int len, x; 3869 u_char *value, *name, digest[AUTHKEYLEN], dsize; 3870 int value_len, name_len; 3871 MD5_CTX ctx; 3872 3873 len = m->m_pkthdr.len; 3874 if (len < 4) { 3875 if (debug) 3876 log(LOG_DEBUG, 3877 SPP_FMT "chap invalid packet length: %d bytes\n", 3878 SPP_ARGS(ifp), len); 3879 return; 3880 } 3881 h = mtod (m, struct lcp_header*); 3882 if (len > ntohs (h->len)) 3883 len = ntohs (h->len); 3884 3885 switch (h->type) { 3886 /* challenge, failure and success are his authproto */ 3887 case CHAP_CHALLENGE: 3888 value = 1 + (u_char*)(h+1); 3889 value_len = value[-1]; 3890 name = value + value_len; 3891 name_len = len - value_len - 5; 3892 if (name_len < 0) { 3893 if (debug) { 3894 log(LOG_DEBUG, 3895 SPP_FMT "chap corrupted challenge " 3896 "<%s id=0x%x len=%d", 3897 SPP_ARGS(ifp), 3898 sppp_auth_type_name(PPP_CHAP, h->type), 3899 h->ident, ntohs(h->len)); 3900 sppp_print_bytes((u_char*) (h+1), len-4); 3901 addlog(">\n"); 3902 } 3903 break; 3904 } 3905 3906 if (debug) { 3907 log(LOG_DEBUG, 3908 SPP_FMT "chap input <%s id=0x%x len=%d name=", 3909 SPP_ARGS(ifp), 3910 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3911 ntohs(h->len)); 3912 sppp_print_string((char*) name, name_len); 3913 addlog(" value-size=%d value=", value_len); 3914 sppp_print_bytes(value, value_len); 3915 addlog(">\n"); 3916 } 3917 3918 /* Compute reply value. */ 3919 MD5Init(&ctx); 3920 MD5Update(&ctx, &h->ident, 1); 3921 MD5Update(&ctx, sp->myauth.secret, 3922 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN)); 3923 MD5Update(&ctx, value, value_len); 3924 MD5Final(digest, &ctx); 3925 dsize = sizeof digest; 3926 3927 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3928 sizeof dsize, (const char *)&dsize, 3929 sizeof digest, digest, 3930 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 3931 sp->myauth.name, 3932 0); 3933 break; 3934 3935 case CHAP_SUCCESS: 3936 if (debug) { 3937 log(LOG_DEBUG, SPP_FMT "chap success", 3938 SPP_ARGS(ifp)); 3939 if (len > 4) { 3940 addlog(": "); 3941 sppp_print_string((char*)(h + 1), len - 4); 3942 } 3943 addlog("\n"); 3944 } 3945 x = splimp(); 3946 sp->pp_flags &= ~PP_NEEDAUTH; 3947 if (sp->myauth.proto == PPP_CHAP && 3948 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3949 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3950 /* 3951 * We are authenticator for CHAP but didn't 3952 * complete yet. Leave it to tlu to proceed 3953 * to network phase. 3954 */ 3955 splx(x); 3956 break; 3957 } 3958 splx(x); 3959 sppp_phase_network(sp); 3960 break; 3961 3962 case CHAP_FAILURE: 3963 if (debug) { 3964 log(LOG_INFO, SPP_FMT "chap failure", 3965 SPP_ARGS(ifp)); 3966 if (len > 4) { 3967 addlog(": "); 3968 sppp_print_string((char*)(h + 1), len - 4); 3969 } 3970 addlog("\n"); 3971 } else 3972 log(LOG_INFO, SPP_FMT "chap failure\n", 3973 SPP_ARGS(ifp)); 3974 /* await LCP shutdown by authenticator */ 3975 break; 3976 3977 /* response is my authproto */ 3978 case CHAP_RESPONSE: 3979 value = 1 + (u_char*)(h+1); 3980 value_len = value[-1]; 3981 name = value + value_len; 3982 name_len = len - value_len - 5; 3983 if (name_len < 0) { 3984 if (debug) { 3985 log(LOG_DEBUG, 3986 SPP_FMT "chap corrupted response " 3987 "<%s id=0x%x len=%d", 3988 SPP_ARGS(ifp), 3989 sppp_auth_type_name(PPP_CHAP, h->type), 3990 h->ident, ntohs(h->len)); 3991 sppp_print_bytes((u_char*)(h+1), len-4); 3992 addlog(">\n"); 3993 } 3994 break; 3995 } 3996 if (h->ident != sp->confid[IDX_CHAP]) { 3997 if (debug) 3998 log(LOG_DEBUG, 3999 SPP_FMT "chap dropping response for old ID " 4000 "(got %d, expected %d)\n", 4001 SPP_ARGS(ifp), 4002 h->ident, sp->confid[IDX_CHAP]); 4003 break; 4004 } 4005 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) 4006 || bcmp(name, sp->hisauth.name, name_len) != 0) { 4007 log(LOG_INFO, SPP_FMT "chap response, his name ", 4008 SPP_ARGS(ifp)); 4009 sppp_print_string(name, name_len); 4010 addlog(" != expected "); 4011 sppp_print_string(sp->hisauth.name, 4012 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)); 4013 addlog("\n"); 4014 } 4015 if (debug) { 4016 log(LOG_DEBUG, SPP_FMT "chap input(%s) " 4017 "<%s id=0x%x len=%d name=", 4018 SPP_ARGS(ifp), 4019 sppp_state_name(sp->state[IDX_CHAP]), 4020 sppp_auth_type_name(PPP_CHAP, h->type), 4021 h->ident, ntohs (h->len)); 4022 sppp_print_string((char*)name, name_len); 4023 addlog(" value-size=%d value=", value_len); 4024 sppp_print_bytes(value, value_len); 4025 addlog(">\n"); 4026 } 4027 if (value_len != AUTHKEYLEN) { 4028 if (debug) 4029 log(LOG_DEBUG, 4030 SPP_FMT "chap bad hash value length: " 4031 "%d bytes, should be %d\n", 4032 SPP_ARGS(ifp), value_len, 4033 AUTHKEYLEN); 4034 break; 4035 } 4036 4037 MD5Init(&ctx); 4038 MD5Update(&ctx, &h->ident, 1); 4039 MD5Update(&ctx, sp->hisauth.secret, 4040 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN)); 4041 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN); 4042 MD5Final(digest, &ctx); 4043 4044 #define FAILMSG "Failed..." 4045 #define SUCCMSG "Welcome!" 4046 4047 if (value_len != sizeof digest || 4048 bcmp(digest, value, value_len) != 0) { 4049 /* action scn, tld */ 4050 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4051 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4052 0); 4053 chap.tld(sp); 4054 break; 4055 } 4056 /* action sca, perhaps tlu */ 4057 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4058 sp->state[IDX_CHAP] == STATE_OPENED) 4059 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4060 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4061 0); 4062 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4063 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4064 chap.tlu(sp); 4065 } 4066 break; 4067 4068 default: 4069 /* Unknown CHAP packet type -- ignore. */ 4070 if (debug) { 4071 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) " 4072 "<0x%x id=0x%xh len=%d", 4073 SPP_ARGS(ifp), 4074 sppp_state_name(sp->state[IDX_CHAP]), 4075 h->type, h->ident, ntohs(h->len)); 4076 sppp_print_bytes((u_char*)(h+1), len-4); 4077 addlog(">\n"); 4078 } 4079 break; 4080 4081 } 4082 } 4083 4084 static void 4085 sppp_chap_init(struct sppp *sp) 4086 { 4087 /* Chap doesn't have STATE_INITIAL at all. */ 4088 sp->state[IDX_CHAP] = STATE_CLOSED; 4089 sp->fail_counter[IDX_CHAP] = 0; 4090 sp->pp_seq[IDX_CHAP] = 0; 4091 sp->pp_rseq[IDX_CHAP] = 0; 4092 #if defined(__DragonFly__) 4093 callout_handle_init(&sp->ch[IDX_CHAP]); 4094 #endif 4095 } 4096 4097 static void 4098 sppp_chap_open(struct sppp *sp) 4099 { 4100 if (sp->myauth.proto == PPP_CHAP && 4101 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4102 /* we are authenticator for CHAP, start it */ 4103 chap.scr(sp); 4104 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4105 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4106 } 4107 /* nothing to be done if we are peer, await a challenge */ 4108 } 4109 4110 static void 4111 sppp_chap_close(struct sppp *sp) 4112 { 4113 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4114 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4115 } 4116 4117 static void 4118 sppp_chap_TO(void *cookie) 4119 { 4120 struct sppp *sp = (struct sppp *)cookie; 4121 STDDCL; 4122 int s; 4123 4124 s = splimp(); 4125 if (debug) 4126 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n", 4127 SPP_ARGS(ifp), 4128 sppp_state_name(sp->state[IDX_CHAP]), 4129 sp->rst_counter[IDX_CHAP]); 4130 4131 if (--sp->rst_counter[IDX_CHAP] < 0) 4132 /* TO- event */ 4133 switch (sp->state[IDX_CHAP]) { 4134 case STATE_REQ_SENT: 4135 chap.tld(sp); 4136 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4137 break; 4138 } 4139 else 4140 /* TO+ (or TO*) event */ 4141 switch (sp->state[IDX_CHAP]) { 4142 case STATE_OPENED: 4143 /* TO* event */ 4144 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4145 /* fall through */ 4146 case STATE_REQ_SENT: 4147 chap.scr(sp); 4148 /* sppp_cp_change_state() will restart the timer */ 4149 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4150 break; 4151 } 4152 4153 splx(s); 4154 } 4155 4156 static void 4157 sppp_chap_tlu(struct sppp *sp) 4158 { 4159 STDDCL; 4160 int i, x; 4161 4162 i = 0; 4163 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4164 4165 /* 4166 * Some broken CHAP implementations (Conware CoNet, firmware 4167 * 4.0.?) don't want to re-authenticate their CHAP once the 4168 * initial challenge-response exchange has taken place. 4169 * Provide for an option to avoid rechallenges. 4170 */ 4171 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) { 4172 /* 4173 * Compute the re-challenge timeout. This will yield 4174 * a number between 300 and 810 seconds. 4175 */ 4176 i = 300 + ((unsigned)(random() & 0xff00) >> 7); 4177 TIMEOUT(chap.TO, (void *)sp, i * hz, sp->ch[IDX_CHAP]); 4178 } 4179 4180 if (debug) { 4181 log(LOG_DEBUG, 4182 SPP_FMT "chap %s, ", 4183 SPP_ARGS(ifp), 4184 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu"); 4185 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) 4186 addlog("next re-challenge in %d seconds\n", i); 4187 else 4188 addlog("re-challenging supressed\n"); 4189 } 4190 4191 x = splimp(); 4192 /* indicate to LCP that we need to be closed down */ 4193 sp->lcp.protos |= (1 << IDX_CHAP); 4194 4195 if (sp->pp_flags & PP_NEEDAUTH) { 4196 /* 4197 * Remote is authenticator, but his auth proto didn't 4198 * complete yet. Defer the transition to network 4199 * phase. 4200 */ 4201 splx(x); 4202 return; 4203 } 4204 splx(x); 4205 4206 /* 4207 * If we are already in phase network, we are done here. This 4208 * is the case if this is a dummy tlu event after a re-challenge. 4209 */ 4210 if (sp->pp_phase != PHASE_NETWORK) 4211 sppp_phase_network(sp); 4212 } 4213 4214 static void 4215 sppp_chap_tld(struct sppp *sp) 4216 { 4217 STDDCL; 4218 4219 if (debug) 4220 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp)); 4221 UNTIMEOUT(chap.TO, (void *)sp, sp->ch[IDX_CHAP]); 4222 sp->lcp.protos &= ~(1 << IDX_CHAP); 4223 4224 lcp.Close(sp); 4225 } 4226 4227 static void 4228 sppp_chap_scr(struct sppp *sp) 4229 { 4230 u_long *ch, seed; 4231 u_char clen; 4232 4233 /* Compute random challenge. */ 4234 ch = (u_long *)sp->myauth.challenge; 4235 #if defined(__DragonFly__) 4236 read_random(&seed, sizeof seed); 4237 #else 4238 { 4239 struct timeval tv; 4240 microtime(&tv); 4241 seed = tv.tv_sec ^ tv.tv_usec; 4242 } 4243 #endif 4244 ch[0] = seed ^ random(); 4245 ch[1] = seed ^ random(); 4246 ch[2] = seed ^ random(); 4247 ch[3] = seed ^ random(); 4248 clen = AUTHKEYLEN; 4249 4250 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4251 4252 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4253 sizeof clen, (const char *)&clen, 4254 (size_t)AUTHKEYLEN, sp->myauth.challenge, 4255 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 4256 sp->myauth.name, 4257 0); 4258 } 4259 4260 /* 4261 *--------------------------------------------------------------------------* 4262 * * 4263 * The PAP implementation. * 4264 * * 4265 *--------------------------------------------------------------------------* 4266 */ 4267 /* 4268 * For PAP, we need to keep a little state also if we are the peer, not the 4269 * authenticator. This is since we don't get a request to authenticate, but 4270 * have to repeatedly authenticate ourself until we got a response (or the 4271 * retry counter is expired). 4272 */ 4273 4274 /* 4275 * Handle incoming PAP packets. */ 4276 static void 4277 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4278 { 4279 STDDCL; 4280 struct lcp_header *h; 4281 int len, x; 4282 u_char *name, *passwd, mlen; 4283 int name_len, passwd_len; 4284 4285 len = m->m_pkthdr.len; 4286 if (len < 5) { 4287 if (debug) 4288 log(LOG_DEBUG, 4289 SPP_FMT "pap invalid packet length: %d bytes\n", 4290 SPP_ARGS(ifp), len); 4291 return; 4292 } 4293 h = mtod (m, struct lcp_header*); 4294 if (len > ntohs (h->len)) 4295 len = ntohs (h->len); 4296 switch (h->type) { 4297 /* PAP request is my authproto */ 4298 case PAP_REQ: 4299 name = 1 + (u_char*)(h+1); 4300 name_len = name[-1]; 4301 passwd = name + name_len + 1; 4302 if (name_len > len - 6 || 4303 (passwd_len = passwd[-1]) > len - 6 - name_len) { 4304 if (debug) { 4305 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4306 "<%s id=0x%x len=%d", 4307 SPP_ARGS(ifp), 4308 sppp_auth_type_name(PPP_PAP, h->type), 4309 h->ident, ntohs(h->len)); 4310 sppp_print_bytes((u_char*)(h+1), len-4); 4311 addlog(">\n"); 4312 } 4313 break; 4314 } 4315 if (debug) { 4316 log(LOG_DEBUG, SPP_FMT "pap input(%s) " 4317 "<%s id=0x%x len=%d name=", 4318 SPP_ARGS(ifp), 4319 sppp_state_name(sp->state[IDX_PAP]), 4320 sppp_auth_type_name(PPP_PAP, h->type), 4321 h->ident, ntohs(h->len)); 4322 sppp_print_string((char*)name, name_len); 4323 addlog(" passwd="); 4324 sppp_print_string((char*)passwd, passwd_len); 4325 addlog(">\n"); 4326 } 4327 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) || 4328 passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) || 4329 bcmp(name, sp->hisauth.name, name_len) != 0 || 4330 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) { 4331 /* action scn, tld */ 4332 mlen = sizeof(FAILMSG) - 1; 4333 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4334 sizeof mlen, (const char *)&mlen, 4335 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4336 0); 4337 pap.tld(sp); 4338 break; 4339 } 4340 /* action sca, perhaps tlu */ 4341 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4342 sp->state[IDX_PAP] == STATE_OPENED) { 4343 mlen = sizeof(SUCCMSG) - 1; 4344 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4345 sizeof mlen, (const char *)&mlen, 4346 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4347 0); 4348 } 4349 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4350 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4351 pap.tlu(sp); 4352 } 4353 break; 4354 4355 /* ack and nak are his authproto */ 4356 case PAP_ACK: 4357 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 4358 if (debug) { 4359 log(LOG_DEBUG, SPP_FMT "pap success", 4360 SPP_ARGS(ifp)); 4361 name_len = *((char *)h); 4362 if (len > 5 && name_len) { 4363 addlog(": "); 4364 sppp_print_string((char*)(h+1), name_len); 4365 } 4366 addlog("\n"); 4367 } 4368 x = splimp(); 4369 sp->pp_flags &= ~PP_NEEDAUTH; 4370 if (sp->myauth.proto == PPP_PAP && 4371 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4372 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4373 /* 4374 * We are authenticator for PAP but didn't 4375 * complete yet. Leave it to tlu to proceed 4376 * to network phase. 4377 */ 4378 splx(x); 4379 break; 4380 } 4381 splx(x); 4382 sppp_phase_network(sp); 4383 break; 4384 4385 case PAP_NAK: 4386 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 4387 if (debug) { 4388 log(LOG_INFO, SPP_FMT "pap failure", 4389 SPP_ARGS(ifp)); 4390 name_len = *((char *)h); 4391 if (len > 5 && name_len) { 4392 addlog(": "); 4393 sppp_print_string((char*)(h+1), name_len); 4394 } 4395 addlog("\n"); 4396 } else 4397 log(LOG_INFO, SPP_FMT "pap failure\n", 4398 SPP_ARGS(ifp)); 4399 /* await LCP shutdown by authenticator */ 4400 break; 4401 4402 default: 4403 /* Unknown PAP packet type -- ignore. */ 4404 if (debug) { 4405 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4406 "<0x%x id=0x%x len=%d", 4407 SPP_ARGS(ifp), 4408 h->type, h->ident, ntohs(h->len)); 4409 sppp_print_bytes((u_char*)(h+1), len-4); 4410 addlog(">\n"); 4411 } 4412 break; 4413 4414 } 4415 } 4416 4417 static void 4418 sppp_pap_init(struct sppp *sp) 4419 { 4420 /* PAP doesn't have STATE_INITIAL at all. */ 4421 sp->state[IDX_PAP] = STATE_CLOSED; 4422 sp->fail_counter[IDX_PAP] = 0; 4423 sp->pp_seq[IDX_PAP] = 0; 4424 sp->pp_rseq[IDX_PAP] = 0; 4425 #if defined(__DragonFly__) 4426 callout_handle_init(&sp->ch[IDX_PAP]); 4427 callout_handle_init(&sp->pap_my_to_ch); 4428 #endif 4429 } 4430 4431 static void 4432 sppp_pap_open(struct sppp *sp) 4433 { 4434 if (sp->hisauth.proto == PPP_PAP && 4435 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4436 /* we are authenticator for PAP, start our timer */ 4437 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4438 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4439 } 4440 if (sp->myauth.proto == PPP_PAP) { 4441 /* we are peer, send a request, and start a timer */ 4442 pap.scr(sp); 4443 TIMEOUT(sppp_pap_my_TO, (void *)sp, sp->lcp.timeout, 4444 sp->pap_my_to_ch); 4445 } 4446 } 4447 4448 static void 4449 sppp_pap_close(struct sppp *sp) 4450 { 4451 if (sp->state[IDX_PAP] != STATE_CLOSED) 4452 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4453 } 4454 4455 /* 4456 * That's the timeout routine if we are authenticator. Since the 4457 * authenticator is basically passive in PAP, we can't do much here. 4458 */ 4459 static void 4460 sppp_pap_TO(void *cookie) 4461 { 4462 struct sppp *sp = (struct sppp *)cookie; 4463 STDDCL; 4464 int s; 4465 4466 s = splimp(); 4467 if (debug) 4468 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n", 4469 SPP_ARGS(ifp), 4470 sppp_state_name(sp->state[IDX_PAP]), 4471 sp->rst_counter[IDX_PAP]); 4472 4473 if (--sp->rst_counter[IDX_PAP] < 0) 4474 /* TO- event */ 4475 switch (sp->state[IDX_PAP]) { 4476 case STATE_REQ_SENT: 4477 pap.tld(sp); 4478 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4479 break; 4480 } 4481 else 4482 /* TO+ event, not very much we could do */ 4483 switch (sp->state[IDX_PAP]) { 4484 case STATE_REQ_SENT: 4485 /* sppp_cp_change_state() will restart the timer */ 4486 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4487 break; 4488 } 4489 4490 splx(s); 4491 } 4492 4493 /* 4494 * That's the timeout handler if we are peer. Since the peer is active, 4495 * we need to retransmit our PAP request since it is apparently lost. 4496 * XXX We should impose a max counter. 4497 */ 4498 static void 4499 sppp_pap_my_TO(void *cookie) 4500 { 4501 struct sppp *sp = (struct sppp *)cookie; 4502 STDDCL; 4503 4504 if (debug) 4505 log(LOG_DEBUG, SPP_FMT "pap peer TO\n", 4506 SPP_ARGS(ifp)); 4507 4508 pap.scr(sp); 4509 } 4510 4511 static void 4512 sppp_pap_tlu(struct sppp *sp) 4513 { 4514 STDDCL; 4515 int x; 4516 4517 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4518 4519 if (debug) 4520 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 4521 SPP_ARGS(ifp), pap.name); 4522 4523 x = splimp(); 4524 /* indicate to LCP that we need to be closed down */ 4525 sp->lcp.protos |= (1 << IDX_PAP); 4526 4527 if (sp->pp_flags & PP_NEEDAUTH) { 4528 /* 4529 * Remote is authenticator, but his auth proto didn't 4530 * complete yet. Defer the transition to network 4531 * phase. 4532 */ 4533 splx(x); 4534 return; 4535 } 4536 splx(x); 4537 sppp_phase_network(sp); 4538 } 4539 4540 static void 4541 sppp_pap_tld(struct sppp *sp) 4542 { 4543 STDDCL; 4544 4545 if (debug) 4546 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp)); 4547 UNTIMEOUT(pap.TO, (void *)sp, sp->ch[IDX_PAP]); 4548 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 4549 sp->lcp.protos &= ~(1 << IDX_PAP); 4550 4551 lcp.Close(sp); 4552 } 4553 4554 static void 4555 sppp_pap_scr(struct sppp *sp) 4556 { 4557 u_char idlen, pwdlen; 4558 4559 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4560 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN); 4561 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN); 4562 4563 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4564 sizeof idlen, (const char *)&idlen, 4565 (size_t)idlen, sp->myauth.name, 4566 sizeof pwdlen, (const char *)&pwdlen, 4567 (size_t)pwdlen, sp->myauth.secret, 4568 0); 4569 } 4570 4571 /* 4572 * Random miscellaneous functions. 4573 */ 4574 4575 /* 4576 * Send a PAP or CHAP proto packet. 4577 * 4578 * Varadic function, each of the elements for the ellipsis is of type 4579 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4580 * mlen == 0. 4581 * NOTE: never declare variadic functions with types subject to type 4582 * promotion (i.e. u_char). This is asking for big trouble depending 4583 * on the architecture you are on... 4584 */ 4585 4586 static void 4587 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4588 unsigned int type, unsigned int id, 4589 ...) 4590 { 4591 STDDCL; 4592 struct ppp_header *h; 4593 struct lcp_header *lh; 4594 struct mbuf *m; 4595 u_char *p; 4596 int len; 4597 unsigned int mlen; 4598 const char *msg; 4599 __va_list ap; 4600 4601 MGETHDR (m, MB_DONTWAIT, MT_DATA); 4602 if (! m) 4603 return; 4604 m->m_pkthdr.rcvif = 0; 4605 4606 h = mtod (m, struct ppp_header*); 4607 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4608 h->control = PPP_UI; /* Unnumbered Info */ 4609 h->protocol = htons(cp->proto); 4610 4611 lh = (struct lcp_header*)(h + 1); 4612 lh->type = type; 4613 lh->ident = id; 4614 p = (u_char*) (lh+1); 4615 4616 __va_start(ap, id); 4617 len = 0; 4618 4619 while ((mlen = (unsigned int)__va_arg(ap, size_t)) != 0) { 4620 msg = __va_arg(ap, const char *); 4621 len += mlen; 4622 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) { 4623 __va_end(ap); 4624 m_freem(m); 4625 return; 4626 } 4627 4628 bcopy(msg, p, mlen); 4629 p += mlen; 4630 } 4631 __va_end(ap); 4632 4633 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len; 4634 lh->len = htons (LCP_HEADER_LEN + len); 4635 4636 if (debug) { 4637 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 4638 SPP_ARGS(ifp), cp->name, 4639 sppp_auth_type_name(cp->proto, lh->type), 4640 lh->ident, ntohs(lh->len)); 4641 sppp_print_bytes((u_char*) (lh+1), len); 4642 addlog(">\n"); 4643 } 4644 if (IF_QFULL (&sp->pp_cpq)) { 4645 IF_DROP (&sp->pp_fastq); 4646 IF_DROP (&ifp->if_snd); 4647 m_freem (m); 4648 ++ifp->if_oerrors; 4649 } else 4650 IF_ENQUEUE (&sp->pp_cpq, m); 4651 if (! (ifp->if_flags & IFF_OACTIVE)) 4652 (*ifp->if_start) (ifp); 4653 ifp->if_obytes += m->m_pkthdr.len + 3; 4654 } 4655 4656 /* 4657 * Flush interface queue. 4658 */ 4659 static void 4660 sppp_qflush(struct ifqueue *ifq) 4661 { 4662 struct mbuf *m, *n; 4663 4664 n = ifq->ifq_head; 4665 while ((m = n)) { 4666 n = m->m_nextpkt; 4667 m_freem (m); 4668 } 4669 ifq->ifq_head = 0; 4670 ifq->ifq_tail = 0; 4671 ifq->ifq_len = 0; 4672 } 4673 4674 /* 4675 * Send keepalive packets, every 10 seconds. 4676 */ 4677 static void 4678 sppp_keepalive(void *dummy) 4679 { 4680 struct sppp *sp; 4681 int s; 4682 4683 s = splimp(); 4684 for (sp=spppq; sp; sp=sp->pp_next) { 4685 struct ifnet *ifp = &sp->pp_if; 4686 4687 /* Keepalive mode disabled or channel down? */ 4688 if (! (sp->pp_flags & PP_KEEPALIVE) || 4689 ! (ifp->if_flags & IFF_RUNNING)) 4690 continue; 4691 4692 /* No keepalive in PPP mode if LCP not opened yet. */ 4693 if (sp->pp_mode != IFF_CISCO && 4694 sp->pp_phase < PHASE_AUTHENTICATE) 4695 continue; 4696 4697 if (sp->pp_alivecnt == MAXALIVECNT) { 4698 /* No keepalive packets got. Stop the interface. */ 4699 printf (SPP_FMT "down\n", SPP_ARGS(ifp)); 4700 if_down (ifp); 4701 sppp_qflush (&sp->pp_cpq); 4702 if (sp->pp_mode != IFF_CISCO) { 4703 /* XXX */ 4704 /* Shut down the PPP link. */ 4705 lcp.Down(sp); 4706 /* Initiate negotiation. XXX */ 4707 lcp.Up(sp); 4708 } 4709 } 4710 if (sp->pp_alivecnt <= MAXALIVECNT) 4711 ++sp->pp_alivecnt; 4712 if (sp->pp_mode == IFF_CISCO) 4713 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, 4714 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4715 else if (sp->pp_phase >= PHASE_AUTHENTICATE) { 4716 long nmagic = htonl (sp->lcp.magic); 4717 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4718 sppp_cp_send (sp, PPP_LCP, ECHO_REQ, 4719 sp->lcp.echoid, 4, &nmagic); 4720 } 4721 } 4722 splx(s); 4723 TIMEOUT(sppp_keepalive, 0, hz * 10, keepalive_ch); 4724 } 4725 4726 /* 4727 * Get both IP addresses. 4728 */ 4729 static void 4730 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask) 4731 { 4732 struct ifnet *ifp = &sp->pp_if; 4733 struct ifaddr *ifa; 4734 struct sockaddr_in *si, *sm; 4735 u_long ssrc, ddst; 4736 4737 sm = NULL; 4738 ssrc = ddst = 0L; 4739 /* 4740 * Pick the first AF_INET address from the list, 4741 * aliases don't make any sense on a p2p link anyway. 4742 */ 4743 si = 0; 4744 #if defined(__DragonFly__) 4745 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 4746 #elif defined(__NetBSD__) || defined (__OpenBSD__) 4747 for (ifa = ifp->if_addrlist.tqh_first; 4748 ifa; 4749 ifa = ifa->ifa_list.tqe_next) 4750 #else 4751 for (ifa = ifp->if_addrlist; 4752 ifa; 4753 ifa = ifa->ifa_next) 4754 #endif 4755 if (ifa->ifa_addr->sa_family == AF_INET) { 4756 si = (struct sockaddr_in *)ifa->ifa_addr; 4757 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4758 if (si) 4759 break; 4760 } 4761 if (ifa) { 4762 if (si && si->sin_addr.s_addr) { 4763 ssrc = si->sin_addr.s_addr; 4764 if (srcmask) 4765 *srcmask = ntohl(sm->sin_addr.s_addr); 4766 } 4767 4768 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4769 if (si && si->sin_addr.s_addr) 4770 ddst = si->sin_addr.s_addr; 4771 } 4772 4773 if (dst) *dst = ntohl(ddst); 4774 if (src) *src = ntohl(ssrc); 4775 } 4776 4777 /* 4778 * Set my IP address. Must be called at splimp. 4779 */ 4780 static void 4781 sppp_set_ip_addr(struct sppp *sp, u_long src) 4782 { 4783 STDDCL; 4784 struct ifaddr *ifa; 4785 struct sockaddr_in *si; 4786 struct in_ifaddr *ia; 4787 4788 /* 4789 * Pick the first AF_INET address from the list, 4790 * aliases don't make any sense on a p2p link anyway. 4791 */ 4792 si = 0; 4793 #if defined(__DragonFly__) 4794 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 4795 #elif defined(__NetBSD__) || defined (__OpenBSD__) 4796 for (ifa = ifp->if_addrlist.tqh_first; 4797 ifa; 4798 ifa = ifa->ifa_list.tqe_next) 4799 #else 4800 for (ifa = ifp->if_addrlist; 4801 ifa; 4802 ifa = ifa->ifa_next) 4803 #endif 4804 { 4805 if (ifa->ifa_addr->sa_family == AF_INET) 4806 { 4807 si = (struct sockaddr_in *)ifa->ifa_addr; 4808 if (si) 4809 break; 4810 } 4811 } 4812 4813 if (ifa && si) 4814 { 4815 int error; 4816 #if __NetBSD_Version__ >= 103080000 4817 struct sockaddr_in new_sin = *si; 4818 4819 new_sin.sin_addr.s_addr = htonl(src); 4820 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 1); 4821 if(debug && error) 4822 { 4823 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: in_ifinit " 4824 " failed, error=%d\n", SPP_ARGS(ifp), error); 4825 } 4826 #else 4827 /* delete old route */ 4828 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST); 4829 if(debug && error) 4830 { 4831 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n", 4832 SPP_ARGS(ifp), error); 4833 } 4834 4835 /* set new address */ 4836 si->sin_addr.s_addr = htonl(src); 4837 ia = ifatoia(ifa); 4838 LIST_REMOVE(ia, ia_hash); 4839 LIST_INSERT_HEAD(INADDR_HASH(si->sin_addr.s_addr), ia, ia_hash); 4840 4841 /* add new route */ 4842 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST); 4843 if (debug && error) 4844 { 4845 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d", 4846 SPP_ARGS(ifp), error); 4847 } 4848 #endif 4849 } 4850 } 4851 4852 #ifdef INET6 4853 /* 4854 * Get both IPv6 addresses. 4855 */ 4856 static void 4857 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4858 struct in6_addr *srcmask) 4859 { 4860 struct ifnet *ifp = &sp->pp_if; 4861 struct ifaddr *ifa; 4862 struct sockaddr_in6 *si, *sm; 4863 struct in6_addr ssrc, ddst; 4864 4865 sm = NULL; 4866 bzero(&ssrc, sizeof(ssrc)); 4867 bzero(&ddst, sizeof(ddst)); 4868 /* 4869 * Pick the first link-local AF_INET6 address from the list, 4870 * aliases don't make any sense on a p2p link anyway. 4871 */ 4872 #if defined(__DragonFly__) 4873 si = 0; 4874 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 4875 #elif defined(__NetBSD__) || defined (__OpenBSD__) 4876 for (ifa = ifp->if_addrlist.tqh_first, si = 0; 4877 ifa; 4878 ifa = ifa->ifa_list.tqe_next) 4879 #else 4880 for (ifa = ifp->if_addrlist, si = 0; 4881 ifa; 4882 ifa = ifa->ifa_next) 4883 #endif 4884 if (ifa->ifa_addr->sa_family == AF_INET6) { 4885 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4886 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4887 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4888 break; 4889 } 4890 if (ifa) { 4891 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4892 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 4893 if (srcmask) { 4894 bcopy(&sm->sin6_addr, srcmask, 4895 sizeof(*srcmask)); 4896 } 4897 } 4898 4899 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4900 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4901 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 4902 } 4903 4904 if (dst) 4905 bcopy(&ddst, dst, sizeof(*dst)); 4906 if (src) 4907 bcopy(&ssrc, src, sizeof(*src)); 4908 } 4909 4910 #ifdef IPV6CP_MYIFID_DYN 4911 /* 4912 * Generate random ifid. 4913 */ 4914 static void 4915 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 4916 { 4917 /* TBD */ 4918 } 4919 4920 /* 4921 * Set my IPv6 address. Must be called at splimp. 4922 */ 4923 static void 4924 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 4925 { 4926 STDDCL; 4927 struct ifaddr *ifa; 4928 struct sockaddr_in6 *sin6; 4929 4930 /* 4931 * Pick the first link-local AF_INET6 address from the list, 4932 * aliases don't make any sense on a p2p link anyway. 4933 */ 4934 4935 sin6 = NULL; 4936 #if defined(__DragonFly__) 4937 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 4938 #elif defined(__NetBSD__) || defined (__OpenBSD__) 4939 for (ifa = ifp->if_addrlist.tqh_first; 4940 ifa; 4941 ifa = ifa->ifa_list.tqe_next) 4942 #else 4943 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 4944 #endif 4945 { 4946 if (ifa->ifa_addr->sa_family == AF_INET6) 4947 { 4948 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 4949 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 4950 break; 4951 } 4952 } 4953 4954 if (ifa && sin6) 4955 { 4956 int error; 4957 struct sockaddr_in6 new_sin6 = *sin6; 4958 4959 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 4960 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 4961 if (debug && error) 4962 { 4963 log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit " 4964 " failed, error=%d\n", SPP_ARGS(ifp), error); 4965 } 4966 } 4967 } 4968 #endif 4969 4970 /* 4971 * Suggest a candidate address to be used by peer. 4972 */ 4973 static void 4974 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 4975 { 4976 struct in6_addr myaddr; 4977 struct timeval tv; 4978 4979 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 4980 4981 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 4982 microtime(&tv); 4983 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 4984 myaddr.s6_addr[14] ^= 0xff; 4985 myaddr.s6_addr[15] ^= 0xff; 4986 } else { 4987 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 4988 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 4989 } 4990 if (suggest) 4991 bcopy(&myaddr, suggest, sizeof(myaddr)); 4992 } 4993 #endif /*INET6*/ 4994 4995 static int 4996 sppp_params(struct sppp *sp, u_long cmd, void *data) 4997 { 4998 u_long subcmd; 4999 struct ifreq *ifr = (struct ifreq *)data; 5000 struct spppreq *spr; 5001 int rv = 0; 5002 5003 spr = malloc(sizeof(struct spppreq), M_TEMP, M_INTWAIT); 5004 5005 /* 5006 * ifr->ifr_data is supposed to point to a struct spppreq. 5007 * Check the cmd word first before attempting to fetch all the 5008 * data. 5009 */ 5010 if ((subcmd = fuword(ifr->ifr_data)) == -1) { 5011 rv = EFAULT; 5012 goto quit; 5013 } 5014 5015 if (copyin((caddr_t)ifr->ifr_data, spr, sizeof(struct spppreq)) != 0) { 5016 rv = EFAULT; 5017 goto quit; 5018 } 5019 5020 switch (subcmd) { 5021 case (int)SPPPIOGDEFS: 5022 if (cmd != SIOCGIFGENERIC) { 5023 rv = EINVAL; 5024 break; 5025 } 5026 /* 5027 * We copy over the entire current state, but clean 5028 * out some of the stuff we don't wanna pass up. 5029 * Remember, SIOCGIFGENERIC is unprotected, and can be 5030 * called by any user. No need to ever get PAP or 5031 * CHAP secrets back to userland anyway. 5032 */ 5033 spr->defs.pp_phase = sp->pp_phase; 5034 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0; 5035 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0; 5036 spr->defs.lcp = sp->lcp; 5037 spr->defs.ipcp = sp->ipcp; 5038 spr->defs.ipv6cp = sp->ipv6cp; 5039 spr->defs.myauth = sp->myauth; 5040 spr->defs.hisauth = sp->hisauth; 5041 bzero(spr->defs.myauth.secret, AUTHKEYLEN); 5042 bzero(spr->defs.myauth.challenge, AUTHKEYLEN); 5043 bzero(spr->defs.hisauth.secret, AUTHKEYLEN); 5044 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN); 5045 /* 5046 * Fixup the LCP timeout value to milliseconds so 5047 * spppcontrol doesn't need to bother about the value 5048 * of "hz". We do the reverse calculation below when 5049 * setting it. 5050 */ 5051 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz; 5052 rv = copyout(spr, (caddr_t)ifr->ifr_data, 5053 sizeof(struct spppreq)); 5054 break; 5055 5056 case (int)SPPPIOSDEFS: 5057 if (cmd != SIOCSIFGENERIC) { 5058 rv = EINVAL; 5059 break; 5060 } 5061 /* 5062 * We have a very specific idea of which fields we 5063 * allow being passed back from userland, so to not 5064 * clobber our current state. For one, we only allow 5065 * setting anything if LCP is in dead or establish 5066 * phase. Once the authentication negotiations 5067 * started, the authentication settings must not be 5068 * changed again. (The administrator can force an 5069 * ifconfig down in order to get LCP back into dead 5070 * phase.) 5071 * 5072 * Also, we only allow for authentication parameters to be 5073 * specified. 5074 * 5075 * XXX Should allow to set or clear pp_flags. 5076 * 5077 * Finally, if the respective authentication protocol to 5078 * be used is set differently than 0, but the secret is 5079 * passed as all zeros, we don't trash the existing secret. 5080 * This allows an administrator to change the system name 5081 * only without clobbering the secret (which he didn't get 5082 * back in a previous SPPPIOGDEFS call). However, the 5083 * secrets are cleared if the authentication protocol is 5084 * reset to 0. */ 5085 if (sp->pp_phase != PHASE_DEAD && 5086 sp->pp_phase != PHASE_ESTABLISH) { 5087 rv = EBUSY; 5088 break; 5089 } 5090 5091 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP && 5092 spr->defs.myauth.proto != PPP_CHAP) || 5093 (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP && 5094 spr->defs.hisauth.proto != PPP_CHAP)) { 5095 rv = EINVAL; 5096 break; 5097 } 5098 5099 if (spr->defs.myauth.proto == 0) 5100 /* resetting myauth */ 5101 bzero(&sp->myauth, sizeof sp->myauth); 5102 else { 5103 /* setting/changing myauth */ 5104 sp->myauth.proto = spr->defs.myauth.proto; 5105 bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN); 5106 if (spr->defs.myauth.secret[0] != '\0') 5107 bcopy(spr->defs.myauth.secret, sp->myauth.secret, 5108 AUTHKEYLEN); 5109 } 5110 if (spr->defs.hisauth.proto == 0) 5111 /* resetting hisauth */ 5112 bzero(&sp->hisauth, sizeof sp->hisauth); 5113 else { 5114 /* setting/changing hisauth */ 5115 sp->hisauth.proto = spr->defs.hisauth.proto; 5116 sp->hisauth.flags = spr->defs.hisauth.flags; 5117 bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN); 5118 if (spr->defs.hisauth.secret[0] != '\0') 5119 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret, 5120 AUTHKEYLEN); 5121 } 5122 /* set LCP restart timer timeout */ 5123 if (spr->defs.lcp.timeout != 0) 5124 sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000; 5125 /* set VJ enable and IPv6 disable flags */ 5126 #ifdef INET 5127 if (spr->defs.enable_vj) 5128 sp->confflags |= CONF_ENABLE_VJ; 5129 else 5130 sp->confflags &= ~CONF_ENABLE_VJ; 5131 #endif 5132 #ifdef INET6 5133 if (spr->defs.enable_ipv6) 5134 sp->confflags |= CONF_ENABLE_IPV6; 5135 else 5136 sp->confflags &= ~CONF_ENABLE_IPV6; 5137 #endif 5138 break; 5139 5140 default: 5141 rv = EINVAL; 5142 } 5143 5144 quit: 5145 free(spr, M_TEMP); 5146 5147 return (rv); 5148 } 5149 5150 static void 5151 sppp_phase_network(struct sppp *sp) 5152 { 5153 STDDCL; 5154 int i; 5155 u_long mask; 5156 5157 sp->pp_phase = PHASE_NETWORK; 5158 5159 if (debug) 5160 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 5161 sppp_phase_name(sp->pp_phase)); 5162 5163 /* Notify NCPs now. */ 5164 for (i = 0; i < IDX_COUNT; i++) 5165 if ((cps[i])->flags & CP_NCP) 5166 (cps[i])->Open(sp); 5167 5168 /* Send Up events to all NCPs. */ 5169 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5170 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5171 (cps[i])->Up(sp); 5172 5173 /* if no NCP is starting, all this was in vain, close down */ 5174 sppp_lcp_check_and_close(sp); 5175 } 5176 5177 5178 static const char * 5179 sppp_cp_type_name(u_char type) 5180 { 5181 static char buf[12]; 5182 switch (type) { 5183 case CONF_REQ: return "conf-req"; 5184 case CONF_ACK: return "conf-ack"; 5185 case CONF_NAK: return "conf-nak"; 5186 case CONF_REJ: return "conf-rej"; 5187 case TERM_REQ: return "term-req"; 5188 case TERM_ACK: return "term-ack"; 5189 case CODE_REJ: return "code-rej"; 5190 case PROTO_REJ: return "proto-rej"; 5191 case ECHO_REQ: return "echo-req"; 5192 case ECHO_REPLY: return "echo-reply"; 5193 case DISC_REQ: return "discard-req"; 5194 } 5195 snprintf (buf, sizeof(buf), "cp/0x%x", type); 5196 return buf; 5197 } 5198 5199 static const char * 5200 sppp_auth_type_name(u_short proto, u_char type) 5201 { 5202 static char buf[12]; 5203 switch (proto) { 5204 case PPP_CHAP: 5205 switch (type) { 5206 case CHAP_CHALLENGE: return "challenge"; 5207 case CHAP_RESPONSE: return "response"; 5208 case CHAP_SUCCESS: return "success"; 5209 case CHAP_FAILURE: return "failure"; 5210 } 5211 case PPP_PAP: 5212 switch (type) { 5213 case PAP_REQ: return "req"; 5214 case PAP_ACK: return "ack"; 5215 case PAP_NAK: return "nak"; 5216 } 5217 } 5218 snprintf (buf, sizeof(buf), "auth/0x%x", type); 5219 return buf; 5220 } 5221 5222 static const char * 5223 sppp_lcp_opt_name(u_char opt) 5224 { 5225 static char buf[12]; 5226 switch (opt) { 5227 case LCP_OPT_MRU: return "mru"; 5228 case LCP_OPT_ASYNC_MAP: return "async-map"; 5229 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5230 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5231 case LCP_OPT_MAGIC: return "magic"; 5232 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5233 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5234 } 5235 snprintf (buf, sizeof(buf), "lcp/0x%x", opt); 5236 return buf; 5237 } 5238 5239 static const char * 5240 sppp_ipcp_opt_name(u_char opt) 5241 { 5242 static char buf[12]; 5243 switch (opt) { 5244 case IPCP_OPT_ADDRESSES: return "addresses"; 5245 case IPCP_OPT_COMPRESSION: return "compression"; 5246 case IPCP_OPT_ADDRESS: return "address"; 5247 } 5248 snprintf (buf, sizeof(buf), "ipcp/0x%x", opt); 5249 return buf; 5250 } 5251 5252 #ifdef INET6 5253 static const char * 5254 sppp_ipv6cp_opt_name(u_char opt) 5255 { 5256 static char buf[12]; 5257 switch (opt) { 5258 case IPV6CP_OPT_IFID: return "ifid"; 5259 case IPV6CP_OPT_COMPRESSION: return "compression"; 5260 } 5261 sprintf (buf, "0x%x", opt); 5262 return buf; 5263 } 5264 #endif 5265 5266 static const char * 5267 sppp_state_name(int state) 5268 { 5269 switch (state) { 5270 case STATE_INITIAL: return "initial"; 5271 case STATE_STARTING: return "starting"; 5272 case STATE_CLOSED: return "closed"; 5273 case STATE_STOPPED: return "stopped"; 5274 case STATE_CLOSING: return "closing"; 5275 case STATE_STOPPING: return "stopping"; 5276 case STATE_REQ_SENT: return "req-sent"; 5277 case STATE_ACK_RCVD: return "ack-rcvd"; 5278 case STATE_ACK_SENT: return "ack-sent"; 5279 case STATE_OPENED: return "opened"; 5280 } 5281 return "illegal"; 5282 } 5283 5284 static const char * 5285 sppp_phase_name(enum ppp_phase phase) 5286 { 5287 switch (phase) { 5288 case PHASE_DEAD: return "dead"; 5289 case PHASE_ESTABLISH: return "establish"; 5290 case PHASE_TERMINATE: return "terminate"; 5291 case PHASE_AUTHENTICATE: return "authenticate"; 5292 case PHASE_NETWORK: return "network"; 5293 } 5294 return "illegal"; 5295 } 5296 5297 static const char * 5298 sppp_proto_name(u_short proto) 5299 { 5300 static char buf[12]; 5301 switch (proto) { 5302 case PPP_LCP: return "lcp"; 5303 case PPP_IPCP: return "ipcp"; 5304 case PPP_PAP: return "pap"; 5305 case PPP_CHAP: return "chap"; 5306 case PPP_IPV6CP: return "ipv6cp"; 5307 } 5308 snprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto); 5309 return buf; 5310 } 5311 5312 static void 5313 sppp_print_bytes(const u_char *p, u_short len) 5314 { 5315 if (len) 5316 addlog(" %*D", len, p, "-"); 5317 } 5318 5319 static void 5320 sppp_print_string(const char *p, u_short len) 5321 { 5322 u_char c; 5323 5324 while (len-- > 0) { 5325 c = *p++; 5326 /* 5327 * Print only ASCII chars directly. RFC 1994 recommends 5328 * using only them, but we don't rely on it. */ 5329 if (c < ' ' || c > '~') 5330 addlog("\\x%x", c); 5331 else 5332 addlog("%c", c); 5333 } 5334 } 5335 5336 static const char * 5337 sppp_dotted_quad(u_long addr) 5338 { 5339 static char s[16]; 5340 sprintf(s, "%d.%d.%d.%d", 5341 (int)((addr >> 24) & 0xff), 5342 (int)((addr >> 16) & 0xff), 5343 (int)((addr >> 8) & 0xff), 5344 (int)(addr & 0xff)); 5345 return s; 5346 } 5347 5348 static int 5349 sppp_strnlen(u_char *p, int max) 5350 { 5351 int len; 5352 5353 for (len = 0; len < max && *p; ++p) 5354 ++len; 5355 return len; 5356 } 5357 5358 /* a dummy, used to drop uninteresting events */ 5359 static void 5360 sppp_null(struct sppp *unused) 5361 { 5362 /* do just nothing */ 5363 } 5364