if_spppsubr.c revision 1.87.4.1
1 /* $NetBSD: if_spppsubr.c,v 1.87.4.1 2006/02/04 14:18:52 simonb Exp $ */ 2 3 /* 4 * Synchronous PPP/Cisco link level subroutines. 5 * Keepalive protocol implemented in both Cisco and PPP modes. 6 * 7 * Copyright (C) 1994-1996 Cronyx Engineering Ltd. 8 * Author: Serge Vakulenko, <vak (at) cronyx.ru> 9 * 10 * Heavily revamped to conform to RFC 1661. 11 * Copyright (C) 1997, Joerg Wunsch. 12 * 13 * RFC2472 IPv6CP support. 14 * Copyright (C) 2000, Jun-ichiro itojun Hagino <itojun (at) iijlab.net>. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions are met: 18 * 1. Redistributions of source code must retain the above copyright notice, 19 * this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright notice, 21 * this list of conditions and the following disclaimer in the documentation 22 * and/or other materials provided with the distribution. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE FREEBSD PROJECT ``AS IS'' AND ANY 25 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE 28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 * 36 * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997 37 * 38 * From: if_spppsubr.c,v 1.39 1998/04/04 13:26:03 phk Exp 39 * 40 * From: Id: if_spppsubr.c,v 1.23 1999/02/23 14:47:50 hm Exp 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: if_spppsubr.c,v 1.87.4.1 2006/02/04 14:18:52 simonb Exp $"); 45 46 #include "opt_inet.h" 47 #include "opt_ipx.h" 48 #include "opt_iso.h" 49 #include "opt_ns.h" 50 #include "opt_pfil_hooks.h" 51 52 #include <sys/param.h> 53 #include <sys/proc.h> 54 #include <sys/systm.h> 55 #include <sys/kernel.h> 56 #include <sys/sockio.h> 57 #include <sys/socket.h> 58 #include <sys/syslog.h> 59 #include <sys/malloc.h> 60 #include <sys/mbuf.h> 61 #include <sys/callout.h> 62 #include <sys/md5.h> 63 #include <sys/inttypes.h> 64 65 #include <net/if.h> 66 #include <net/netisr.h> 67 #include <net/if_types.h> 68 #include <net/route.h> 69 #include <net/ppp_defs.h> 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 #ifdef INET 77 #include <netinet/ip.h> 78 #include <netinet/tcp.h> 79 #endif 80 #include <net/ethertypes.h> 81 82 #ifdef INET6 83 #include <netinet6/scope6_var.h> 84 #endif 85 86 #ifdef IPX 87 #include <netipx/ipx.h> 88 #include <netipx/ipx_if.h> 89 #endif 90 91 #ifdef NS 92 #include <netns/ns.h> 93 #include <netns/ns_if.h> 94 #endif 95 96 #ifdef ISO 97 #include <netiso/argo_debug.h> 98 #include <netiso/iso.h> 99 #include <netiso/iso_var.h> 100 #include <netiso/iso_snpac.h> 101 #endif 102 103 #include <net/if_sppp.h> 104 #include <net/if_spppvar.h> 105 106 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 107 #define LOOPALIVECNT 3 /* loopback detection tries */ 108 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 109 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 110 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 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 */ 135 136 #define CONF_REQ 1 /* PPP configure request */ 137 #define CONF_ACK 2 /* PPP configure acknowledge */ 138 #define CONF_NAK 3 /* PPP configure negative ack */ 139 #define CONF_REJ 4 /* PPP configure reject */ 140 #define TERM_REQ 5 /* PPP terminate request */ 141 #define TERM_ACK 6 /* PPP terminate acknowledge */ 142 #define CODE_REJ 7 /* PPP code reject */ 143 #define PROTO_REJ 8 /* PPP protocol reject */ 144 #define ECHO_REQ 9 /* PPP echo request */ 145 #define ECHO_REPLY 10 /* PPP echo reply */ 146 #define DISC_REQ 11 /* PPP discard request */ 147 148 #define LCP_OPT_MRU 1 /* maximum receive unit */ 149 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 150 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 151 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 152 #define LCP_OPT_MAGIC 5 /* magic number */ 153 #define LCP_OPT_RESERVED 6 /* reserved */ 154 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 155 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 156 157 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 158 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 159 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 160 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 161 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 162 163 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 164 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 165 166 #define PAP_REQ 1 /* PAP name/password request */ 167 #define PAP_ACK 2 /* PAP acknowledge */ 168 #define PAP_NAK 3 /* PAP fail */ 169 170 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 171 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 172 #define CHAP_SUCCESS 3 /* CHAP response ok */ 173 #define CHAP_FAILURE 4 /* CHAP response failed */ 174 175 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 176 177 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 178 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 179 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 180 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 181 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 182 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 183 184 /* states are named and numbered according to RFC 1661 */ 185 #define STATE_INITIAL 0 186 #define STATE_STARTING 1 187 #define STATE_CLOSED 2 188 #define STATE_STOPPED 3 189 #define STATE_CLOSING 4 190 #define STATE_STOPPING 5 191 #define STATE_REQ_SENT 6 192 #define STATE_ACK_RCVD 7 193 #define STATE_ACK_SENT 8 194 #define STATE_OPENED 9 195 196 struct ppp_header { 197 u_int8_t address; 198 u_int8_t control; 199 u_int16_t protocol; 200 } __attribute__((__packed__)); 201 #define PPP_HEADER_LEN sizeof (struct ppp_header) 202 203 struct lcp_header { 204 u_int8_t type; 205 u_int8_t ident; 206 u_int16_t len; 207 } __attribute__((__packed__)); 208 #define LCP_HEADER_LEN sizeof (struct lcp_header) 209 210 struct cisco_packet { 211 u_int32_t type; 212 u_int32_t par1; 213 u_int32_t par2; 214 u_int16_t rel; 215 u_int16_t time0; 216 u_int16_t time1; 217 } __attribute__((__packed__)); 218 #define CISCO_PACKET_LEN 18 219 220 /* 221 * We follow the spelling and capitalization of RFC 1661 here, to make 222 * it easier comparing with the standard. Please refer to this RFC in 223 * case you can't make sense out of these abbreviation; it will also 224 * explain the semantics related to the various events and actions. 225 */ 226 struct cp { 227 u_short proto; /* PPP control protocol number */ 228 u_char protoidx; /* index into state table in struct sppp */ 229 u_char flags; 230 #define CP_LCP 0x01 /* this is the LCP */ 231 #define CP_AUTH 0x02 /* this is an authentication protocol */ 232 #define CP_NCP 0x04 /* this is a NCP */ 233 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 234 const char *name; /* name of this control protocol */ 235 /* event handlers */ 236 void (*Up)(struct sppp *sp); 237 void (*Down)(struct sppp *sp); 238 void (*Open)(struct sppp *sp); 239 void (*Close)(struct sppp *sp); 240 void (*TO)(void *sp); 241 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 242 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 243 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 244 /* actions */ 245 void (*tlu)(struct sppp *sp); 246 void (*tld)(struct sppp *sp); 247 void (*tls)(struct sppp *sp); 248 void (*tlf)(struct sppp *sp); 249 void (*scr)(struct sppp *sp); 250 }; 251 252 static struct sppp *spppq; 253 static struct callout keepalive_ch; 254 255 #ifdef INET 256 /* 257 * The following disgusting hack gets around the problem that IP TOS 258 * can't be set yet. We want to put "interactive" traffic on a high 259 * priority queue. To decide if traffic is interactive, we check that 260 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 261 * 262 * XXX is this really still necessary? - joerg - 263 */ 264 static u_short interactive_ports[8] = { 265 0, 513, 0, 0, 266 0, 21, 0, 23, 267 }; 268 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 269 #endif 270 271 /* almost every function needs these */ 272 #define STDDCL \ 273 struct ifnet *ifp = &sp->pp_if; \ 274 int debug = ifp->if_flags & IFF_DEBUG 275 276 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 277 struct sockaddr *dst, struct rtentry *rt); 278 279 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 280 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 281 282 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 283 struct mbuf *m); 284 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 285 u_char ident, u_short len, void *data); 286 /* static void sppp_cp_timeout(void *arg); */ 287 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 288 int newstate); 289 static void sppp_auth_send(const struct cp *cp, 290 struct sppp *sp, unsigned int type, unsigned int id, 291 ...); 292 293 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 294 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 295 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 296 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 297 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 298 299 static void sppp_null(struct sppp *sp); 300 301 static void sppp_lcp_init(struct sppp *sp); 302 static void sppp_lcp_up(struct sppp *sp); 303 static void sppp_lcp_down(struct sppp *sp); 304 static void sppp_lcp_open(struct sppp *sp); 305 static void sppp_lcp_close(struct sppp *sp); 306 static void sppp_lcp_TO(void *sp); 307 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 308 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 309 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 310 static void sppp_lcp_tlu(struct sppp *sp); 311 static void sppp_lcp_tld(struct sppp *sp); 312 static void sppp_lcp_tls(struct sppp *sp); 313 static void sppp_lcp_tlf(struct sppp *sp); 314 static void sppp_lcp_scr(struct sppp *sp); 315 static void sppp_lcp_check_and_close(struct sppp *sp); 316 static int sppp_ncp_check(struct sppp *sp); 317 318 static void sppp_ipcp_init(struct sppp *sp); 319 static void sppp_ipcp_up(struct sppp *sp); 320 static void sppp_ipcp_down(struct sppp *sp); 321 static void sppp_ipcp_open(struct sppp *sp); 322 static void sppp_ipcp_close(struct sppp *sp); 323 static void sppp_ipcp_TO(void *sp); 324 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 325 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 326 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 327 static void sppp_ipcp_tlu(struct sppp *sp); 328 static void sppp_ipcp_tld(struct sppp *sp); 329 static void sppp_ipcp_tls(struct sppp *sp); 330 static void sppp_ipcp_tlf(struct sppp *sp); 331 static void sppp_ipcp_scr(struct sppp *sp); 332 333 static void sppp_ipv6cp_init(struct sppp *sp); 334 static void sppp_ipv6cp_up(struct sppp *sp); 335 static void sppp_ipv6cp_down(struct sppp *sp); 336 static void sppp_ipv6cp_open(struct sppp *sp); 337 static void sppp_ipv6cp_close(struct sppp *sp); 338 static void sppp_ipv6cp_TO(void *sp); 339 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 340 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 341 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 342 static void sppp_ipv6cp_tlu(struct sppp *sp); 343 static void sppp_ipv6cp_tld(struct sppp *sp); 344 static void sppp_ipv6cp_tls(struct sppp *sp); 345 static void sppp_ipv6cp_tlf(struct sppp *sp); 346 static void sppp_ipv6cp_scr(struct sppp *sp); 347 348 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 349 static void sppp_pap_init(struct sppp *sp); 350 static void sppp_pap_open(struct sppp *sp); 351 static void sppp_pap_close(struct sppp *sp); 352 static void sppp_pap_TO(void *sp); 353 static void sppp_pap_my_TO(void *sp); 354 static void sppp_pap_tlu(struct sppp *sp); 355 static void sppp_pap_tld(struct sppp *sp); 356 static void sppp_pap_scr(struct sppp *sp); 357 358 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 359 static void sppp_chap_init(struct sppp *sp); 360 static void sppp_chap_open(struct sppp *sp); 361 static void sppp_chap_close(struct sppp *sp); 362 static void sppp_chap_TO(void *sp); 363 static void sppp_chap_tlu(struct sppp *sp); 364 static void sppp_chap_tld(struct sppp *sp); 365 static void sppp_chap_scr(struct sppp *sp); 366 367 static const char *sppp_auth_type_name(u_short proto, u_char type); 368 static const char *sppp_cp_type_name(u_char type); 369 static const char *sppp_dotted_quad(u_int32_t addr); 370 static const char *sppp_ipcp_opt_name(u_char opt); 371 #ifdef INET6 372 static const char *sppp_ipv6cp_opt_name(u_char opt); 373 #endif 374 static const char *sppp_lcp_opt_name(u_char opt); 375 static const char *sppp_phase_name(int phase); 376 static const char *sppp_proto_name(u_short proto); 377 static const char *sppp_state_name(int state); 378 static int sppp_params(struct sppp *sp, int cmd, void *data); 379 #ifdef INET 380 static void sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, 381 u_int32_t *srcmask); 382 static void sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr); 383 static void sppp_clear_ip_addrs(struct sppp *sp); 384 #endif 385 static void sppp_keepalive(void *dummy); 386 static void sppp_phase_network(struct sppp *sp); 387 static void sppp_print_bytes(const u_char *p, u_short len); 388 static void sppp_print_string(const char *p, u_short len); 389 #ifdef INET6 390 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 391 struct in6_addr *dst, struct in6_addr *srcmask); 392 #ifdef IPV6CP_MYIFID_DYN 393 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 394 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 395 #endif 396 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 397 #endif 398 399 /* our control protocol descriptors */ 400 static const struct cp lcp = { 401 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 402 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 403 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 404 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 405 sppp_lcp_scr 406 }; 407 408 static const struct cp ipcp = { 409 PPP_IPCP, IDX_IPCP, 410 #ifdef INET 411 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 412 #else 413 0, 414 #endif 415 "ipcp", 416 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 417 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 418 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 419 sppp_ipcp_scr 420 }; 421 422 static const struct cp ipv6cp = { 423 PPP_IPV6CP, IDX_IPV6CP, 424 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 425 CP_NCP, 426 #else 427 0, 428 #endif 429 "ipv6cp", 430 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 431 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 432 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 433 sppp_ipv6cp_scr 434 }; 435 436 static const struct cp pap = { 437 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 438 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 439 sppp_pap_TO, 0, 0, 0, 440 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 441 sppp_pap_scr 442 }; 443 444 static const struct cp chap = { 445 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 446 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 447 sppp_chap_TO, 0, 0, 0, 448 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 449 sppp_chap_scr 450 }; 451 452 static const struct cp *cps[IDX_COUNT] = { 453 &lcp, /* IDX_LCP */ 454 &ipcp, /* IDX_IPCP */ 455 &ipv6cp, /* IDX_IPV6CP */ 456 &pap, /* IDX_PAP */ 457 &chap, /* IDX_CHAP */ 458 }; 459 460 461 /* 462 * Exported functions, comprising our interface to the lower layer. 463 */ 464 465 /* 466 * Process the received packet. 467 */ 468 void 469 sppp_input(struct ifnet *ifp, struct mbuf *m) 470 { 471 struct ppp_header *h = NULL; 472 struct ifqueue *inq = 0; 473 u_int16_t protocol; 474 int s; 475 struct sppp *sp = (struct sppp *)ifp; 476 int debug = ifp->if_flags & IFF_DEBUG; 477 478 if (ifp->if_flags & IFF_UP) { 479 /* Count received bytes, add hardware framing */ 480 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 481 /* Note time of last receive */ 482 sp->pp_last_receive = time_uptime; 483 } 484 485 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 486 /* Too small packet, drop it. */ 487 if (debug) 488 log(LOG_DEBUG, 489 "%s: input packet is too small, %d bytes\n", 490 ifp->if_xname, m->m_pkthdr.len); 491 drop: 492 ++ifp->if_ierrors; 493 ++ifp->if_iqdrops; 494 m_freem(m); 495 return; 496 } 497 498 if (sp->pp_flags & PP_NOFRAMING) { 499 memcpy(&protocol, mtod(m, void *), 2); 500 protocol = ntohs(protocol); 501 m_adj(m, 2); 502 } else { 503 504 /* Get PPP header. */ 505 h = mtod(m, struct ppp_header *); 506 m_adj(m, PPP_HEADER_LEN); 507 508 switch (h->address) { 509 case PPP_ALLSTATIONS: 510 if (h->control != PPP_UI) 511 goto invalid; 512 if (sp->pp_flags & PP_CISCO) { 513 if (debug) 514 log(LOG_DEBUG, 515 "%s: PPP packet in Cisco mode " 516 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 517 ifp->if_xname, 518 h->address, h->control, ntohs(h->protocol)); 519 goto drop; 520 } 521 break; 522 case CISCO_MULTICAST: 523 case CISCO_UNICAST: 524 /* Don't check the control field here (RFC 1547). */ 525 if (! (sp->pp_flags & PP_CISCO)) { 526 if (debug) 527 log(LOG_DEBUG, 528 "%s: Cisco packet in PPP mode " 529 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 530 ifp->if_xname, 531 h->address, h->control, ntohs(h->protocol)); 532 goto drop; 533 } 534 switch (ntohs(h->protocol)) { 535 default: 536 ++ifp->if_noproto; 537 goto invalid; 538 case CISCO_KEEPALIVE: 539 sppp_cisco_input((struct sppp *) ifp, m); 540 m_freem(m); 541 return; 542 #ifdef INET 543 case ETHERTYPE_IP: 544 schednetisr(NETISR_IP); 545 inq = &ipintrq; 546 break; 547 #endif 548 #ifdef INET6 549 case ETHERTYPE_IPV6: 550 schednetisr(NETISR_IPV6); 551 inq = &ip6intrq; 552 break; 553 #endif 554 #ifdef IPX 555 case ETHERTYPE_IPX: 556 schednetisr(NETISR_IPX); 557 inq = &ipxintrq; 558 break; 559 #endif 560 #ifdef NS 561 case ETHERTYPE_NS: 562 schednetisr(NETISR_NS); 563 inq = &nsintrq; 564 break; 565 #endif 566 } 567 goto queue_pkt; 568 default: /* Invalid PPP packet. */ 569 invalid: 570 if (debug) 571 log(LOG_DEBUG, 572 "%s: invalid input packet " 573 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 574 ifp->if_xname, 575 h->address, h->control, ntohs(h->protocol)); 576 goto drop; 577 } 578 protocol = ntohs(h->protocol); 579 } 580 581 switch (protocol) { 582 default: 583 if (sp->state[IDX_LCP] == STATE_OPENED) { 584 u_int16_t prot = htons(protocol); 585 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 586 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 587 &prot); 588 } 589 if (debug) 590 log(LOG_DEBUG, 591 "%s: invalid input protocol " 592 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 593 ++ifp->if_noproto; 594 goto drop; 595 case PPP_LCP: 596 sppp_cp_input(&lcp, sp, m); 597 m_freem(m); 598 return; 599 case PPP_PAP: 600 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 601 sppp_pap_input(sp, m); 602 m_freem(m); 603 return; 604 case PPP_CHAP: 605 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 606 sppp_chap_input(sp, m); 607 m_freem(m); 608 return; 609 #ifdef INET 610 case PPP_IPCP: 611 if (sp->pp_phase == SPPP_PHASE_NETWORK) 612 sppp_cp_input(&ipcp, sp, m); 613 m_freem(m); 614 return; 615 case PPP_IP: 616 if (sp->state[IDX_IPCP] == STATE_OPENED) { 617 schednetisr(NETISR_IP); 618 inq = &ipintrq; 619 sp->pp_last_activity = time_uptime; 620 } 621 break; 622 #endif 623 #ifdef INET6 624 case PPP_IPV6CP: 625 if (sp->pp_phase == SPPP_PHASE_NETWORK) 626 sppp_cp_input(&ipv6cp, sp, m); 627 m_freem(m); 628 return; 629 630 case PPP_IPV6: 631 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 632 schednetisr(NETISR_IPV6); 633 inq = &ip6intrq; 634 sp->pp_last_activity = time_uptime; 635 } 636 break; 637 #endif 638 #ifdef IPX 639 case PPP_IPX: 640 /* IPX IPXCP not implemented yet */ 641 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 642 schednetisr(NETISR_IPX); 643 inq = &ipxintrq; 644 } 645 break; 646 #endif 647 #ifdef NS 648 case PPP_XNS: 649 /* XNS IDPCP not implemented yet */ 650 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 651 schednetisr(NETISR_NS); 652 inq = &nsintrq; 653 } 654 break; 655 #endif 656 #ifdef ISO 657 case PPP_ISO: 658 /* OSI NLCP not implemented yet */ 659 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 660 schednetisr(NETISR_ISO); 661 inq = &clnlintrq; 662 } 663 break; 664 #endif 665 } 666 667 queue_pkt: 668 if (! (ifp->if_flags & IFF_UP) || ! inq) 669 goto drop; 670 671 /* Check queue. */ 672 s = splnet(); 673 if (IF_QFULL(inq)) { 674 /* Queue overflow. */ 675 IF_DROP(inq); 676 splx(s); 677 if (debug) 678 log(LOG_DEBUG, "%s: protocol queue overflow\n", 679 ifp->if_xname); 680 goto drop; 681 } 682 IF_ENQUEUE(inq, m); 683 splx(s); 684 } 685 686 /* 687 * Enqueue transmit packet. 688 */ 689 static int 690 sppp_output(struct ifnet *ifp, struct mbuf *m, 691 struct sockaddr *dst, struct rtentry *rt) 692 { 693 struct sppp *sp = (struct sppp *) ifp; 694 struct ppp_header *h = NULL; 695 struct ifqueue *ifq = NULL; /* XXX */ 696 int s, error = 0; 697 u_int16_t protocol; 698 ALTQ_DECL(struct altq_pktattr pktattr;) 699 700 s = splnet(); 701 702 sp->pp_last_activity = time_uptime; 703 704 if ((ifp->if_flags & IFF_UP) == 0 || 705 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 706 m_freem(m); 707 splx(s); 708 return (ENETDOWN); 709 } 710 711 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 712 /* 713 * Interface is not yet running, but auto-dial. Need 714 * to start LCP for it. 715 */ 716 ifp->if_flags |= IFF_RUNNING; 717 splx(s); 718 lcp.Open(sp); 719 s = splnet(); 720 } 721 722 /* 723 * If the queueing discipline needs packet classification, 724 * do it before prepending link headers. 725 */ 726 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 727 728 #ifdef INET 729 if (dst->sa_family == AF_INET) { 730 struct ip *ip = NULL; 731 struct tcphdr *th = NULL; 732 733 if (m->m_len >= sizeof(struct ip)) { 734 ip = mtod(m, struct ip *); 735 if (ip->ip_p == IPPROTO_TCP && 736 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 737 sizeof(struct tcphdr)) { 738 th = (struct tcphdr *) 739 ((caddr_t)ip + (ip->ip_hl << 2)); 740 } 741 } else 742 ip = NULL; 743 744 /* 745 * When using dynamic local IP address assignment by using 746 * 0.0.0.0 as a local address, the first TCP session will 747 * not connect because the local TCP checksum is computed 748 * using 0.0.0.0 which will later become our real IP address 749 * so the TCP checksum computed at the remote end will 750 * become invalid. So we 751 * - don't let packets with src ip addr 0 thru 752 * - we flag TCP packets with src ip 0 as an error 753 */ 754 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 755 u_int8_t proto = ip->ip_p; 756 757 m_freem(m); 758 splx(s); 759 if (proto == IPPROTO_TCP) 760 return (EADDRNOTAVAIL); 761 else 762 return (0); 763 } 764 765 /* 766 * Put low delay, telnet, rlogin and ftp control packets 767 * in front of the queue. 768 */ 769 770 if (!IF_QFULL(&sp->pp_fastq) && 771 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 772 (th && (INTERACTIVE(ntohs(th->th_sport)) || 773 INTERACTIVE(ntohs(th->th_dport)))))) 774 ifq = &sp->pp_fastq; 775 } 776 #endif 777 778 #ifdef INET6 779 if (dst->sa_family == AF_INET6) { 780 /* XXX do something tricky here? */ 781 } 782 #endif 783 784 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 785 /* 786 * Prepend general data packet PPP header. For now, IP only. 787 */ 788 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 789 if (! m) { 790 if (ifp->if_flags & IFF_DEBUG) 791 log(LOG_DEBUG, "%s: no memory for transmit header\n", 792 ifp->if_xname); 793 ++ifp->if_oerrors; 794 splx(s); 795 return (ENOBUFS); 796 } 797 /* 798 * May want to check size of packet 799 * (albeit due to the implementation it's always enough) 800 */ 801 h = mtod(m, struct ppp_header *); 802 if (sp->pp_flags & PP_CISCO) { 803 h->address = CISCO_UNICAST; /* unicast address */ 804 h->control = 0; 805 } else { 806 h->address = PPP_ALLSTATIONS; /* broadcast address */ 807 h->control = PPP_UI; /* Unnumbered Info */ 808 } 809 } 810 811 switch (dst->sa_family) { 812 #ifdef INET 813 case AF_INET: /* Internet Protocol */ 814 if (sp->pp_flags & PP_CISCO) 815 protocol = htons(ETHERTYPE_IP); 816 else { 817 /* 818 * Don't choke with an ENETDOWN early. It's 819 * possible that we just started dialing out, 820 * so don't drop the packet immediately. If 821 * we notice that we run out of buffer space 822 * below, we will however remember that we are 823 * not ready to carry IP packets, and return 824 * ENETDOWN, as opposed to ENOBUFS. 825 */ 826 protocol = htons(PPP_IP); 827 if (sp->state[IDX_IPCP] != STATE_OPENED) 828 error = ENETDOWN; 829 } 830 break; 831 #endif 832 #ifdef INET6 833 case AF_INET6: /* Internet Protocol version 6 */ 834 if (sp->pp_flags & PP_CISCO) 835 protocol = htons(ETHERTYPE_IPV6); 836 else { 837 /* 838 * Don't choke with an ENETDOWN early. It's 839 * possible that we just started dialing out, 840 * so don't drop the packet immediately. If 841 * we notice that we run out of buffer space 842 * below, we will however remember that we are 843 * not ready to carry IP packets, and return 844 * ENETDOWN, as opposed to ENOBUFS. 845 */ 846 protocol = htons(PPP_IPV6); 847 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 848 error = ENETDOWN; 849 } 850 break; 851 #endif 852 #ifdef NS 853 case AF_NS: /* Xerox NS Protocol */ 854 protocol = htons((sp->pp_flags & PP_CISCO) ? 855 ETHERTYPE_NS : PPP_XNS); 856 break; 857 #endif 858 #ifdef IPX 859 case AF_IPX: /* Novell IPX Protocol */ 860 protocol = htons((sp->pp_flags & PP_CISCO) ? 861 ETHERTYPE_IPX : PPP_IPX); 862 break; 863 #endif 864 #ifdef ISO 865 case AF_ISO: /* ISO OSI Protocol */ 866 if (sp->pp_flags & PP_CISCO) 867 goto nosupport; 868 protocol = htons(PPP_ISO); 869 break; 870 nosupport: 871 #endif 872 default: 873 m_freem(m); 874 ++ifp->if_oerrors; 875 splx(s); 876 return (EAFNOSUPPORT); 877 } 878 879 if (sp->pp_flags & PP_NOFRAMING) { 880 M_PREPEND(m, 2, M_DONTWAIT); 881 if (m == NULL) { 882 if (ifp->if_flags & IFF_DEBUG) 883 log(LOG_DEBUG, "%s: no memory for transmit header\n", 884 ifp->if_xname); 885 ++ifp->if_oerrors; 886 splx(s); 887 return (ENOBUFS); 888 } 889 *mtod(m, u_int16_t *) = protocol; 890 } else { 891 h->protocol = protocol; 892 } 893 894 895 error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 896 897 if (error == 0) { 898 /* 899 * Count output packets and bytes. 900 * The packet length includes header + additional hardware 901 * framing according to RFC 1333. 902 */ 903 if (!(ifp->if_flags & IFF_OACTIVE)) 904 (*ifp->if_start)(ifp); 905 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 906 } 907 splx(s); 908 return error; 909 } 910 911 void 912 sppp_attach(struct ifnet *ifp) 913 { 914 struct sppp *sp = (struct sppp *) ifp; 915 916 /* Initialize keepalive handler. */ 917 if (! spppq) { 918 callout_init(&keepalive_ch); 919 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 920 } 921 922 /* Insert new entry into the keepalive list. */ 923 sp->pp_next = spppq; 924 spppq = sp; 925 926 sp->pp_if.if_type = IFT_PPP; 927 sp->pp_if.if_output = sppp_output; 928 sp->pp_fastq.ifq_maxlen = 32; 929 sp->pp_cpq.ifq_maxlen = 20; 930 sp->pp_loopcnt = 0; 931 sp->pp_alivecnt = 0; 932 sp->pp_last_activity = 0; 933 sp->pp_last_receive = 0; 934 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 935 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 936 sp->pp_idle_timeout = 0; 937 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 938 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 939 sp->pp_auth_failures = 0; 940 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 941 sp->pp_phase = SPPP_PHASE_DEAD; 942 sp->pp_up = lcp.Up; 943 sp->pp_down = lcp.Down; 944 945 if_alloc_sadl(ifp); 946 947 memset(&sp->myauth, 0, sizeof sp->myauth); 948 memset(&sp->hisauth, 0, sizeof sp->hisauth); 949 sppp_lcp_init(sp); 950 sppp_ipcp_init(sp); 951 sppp_ipv6cp_init(sp); 952 sppp_pap_init(sp); 953 sppp_chap_init(sp); 954 } 955 956 void 957 sppp_detach(struct ifnet *ifp) 958 { 959 struct sppp **q, *p, *sp = (struct sppp *) ifp; 960 int i; 961 962 /* Remove the entry from the keepalive list. */ 963 for (q = &spppq; (p = *q); q = &p->pp_next) 964 if (p == sp) { 965 *q = p->pp_next; 966 break; 967 } 968 969 /* Stop keepalive handler. */ 970 if (! spppq) { 971 callout_stop(&keepalive_ch); 972 } 973 974 for (i = 0; i < IDX_COUNT; i++) { 975 callout_stop(&sp->ch[i]); 976 } 977 callout_stop(&sp->pap_my_to_ch); 978 979 /* free authentication info */ 980 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 981 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 982 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 983 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 984 985 #if 0 /* done in if_detach() */ 986 if_free_sadl(ifp); 987 #endif 988 } 989 990 /* 991 * Flush the interface output queue. 992 */ 993 void 994 sppp_flush(struct ifnet *ifp) 995 { 996 struct sppp *sp = (struct sppp *) ifp; 997 998 IFQ_PURGE(&sp->pp_if.if_snd); 999 IF_PURGE(&sp->pp_fastq); 1000 IF_PURGE(&sp->pp_cpq); 1001 } 1002 1003 /* 1004 * Check if the output queue is empty. 1005 */ 1006 int 1007 sppp_isempty(struct ifnet *ifp) 1008 { 1009 struct sppp *sp = (struct sppp *) ifp; 1010 int empty, s; 1011 1012 s = splnet(); 1013 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 1014 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 1015 splx(s); 1016 return (empty); 1017 } 1018 1019 /* 1020 * Get next packet to send. 1021 */ 1022 struct mbuf * 1023 sppp_dequeue(struct ifnet *ifp) 1024 { 1025 struct sppp *sp = (struct sppp *) ifp; 1026 struct mbuf *m; 1027 int s; 1028 1029 s = splnet(); 1030 /* 1031 * Process only the control protocol queue until we have at 1032 * least one NCP open. 1033 * 1034 * Do always serve all three queues in Cisco mode. 1035 */ 1036 IF_DEQUEUE(&sp->pp_cpq, m); 1037 if (m == NULL && 1038 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1039 IF_DEQUEUE(&sp->pp_fastq, m); 1040 if (m == NULL) 1041 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1042 } 1043 splx(s); 1044 return m; 1045 } 1046 1047 /* 1048 * Process an ioctl request. Called on low priority level. 1049 */ 1050 int 1051 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1052 { 1053 struct ifreq *ifr = (struct ifreq *) data; 1054 struct sppp *sp = (struct sppp *) ifp; 1055 int s, error=0, going_up, going_down, newmode; 1056 1057 s = splnet(); 1058 switch (cmd) { 1059 case SIOCAIFADDR: 1060 case SIOCSIFDSTADDR: 1061 break; 1062 1063 case SIOCSIFADDR: 1064 if_up(ifp); 1065 /* fall through... */ 1066 1067 case SIOCSIFFLAGS: 1068 going_up = ifp->if_flags & IFF_UP && 1069 (ifp->if_flags & IFF_RUNNING) == 0; 1070 going_down = (ifp->if_flags & IFF_UP) == 0 && 1071 ifp->if_flags & IFF_RUNNING; 1072 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1073 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1074 /* sanity */ 1075 newmode = IFF_PASSIVE; 1076 ifp->if_flags &= ~IFF_AUTO; 1077 } 1078 1079 if (going_up || going_down) 1080 lcp.Close(sp); 1081 if (going_up && newmode == 0) { 1082 /* neither auto-dial nor passive */ 1083 ifp->if_flags |= IFF_RUNNING; 1084 if (!(sp->pp_flags & PP_CISCO)) 1085 lcp.Open(sp); 1086 } else if (going_down) { 1087 sppp_flush(ifp); 1088 ifp->if_flags &= ~IFF_RUNNING; 1089 } 1090 1091 break; 1092 1093 #ifdef SIOCSIFMTU 1094 #ifndef ifr_mtu 1095 #define ifr_mtu ifr_metric 1096 #endif 1097 case SIOCSIFMTU: 1098 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) { 1099 error = EINVAL; 1100 break; 1101 } 1102 1103 ifp->if_mtu = ifr->ifr_mtu; 1104 break; 1105 #endif 1106 #ifdef SLIOCSETMTU 1107 case SLIOCSETMTU: 1108 if (*(short *)data < 128 || *(short *)data > sp->lcp.their_mru) 1109 { 1110 error = EINVAL; 1111 break; 1112 } 1113 1114 ifp->if_mtu = *(short *)data; 1115 break; 1116 #endif 1117 #ifdef SIOCGIFMTU 1118 case SIOCGIFMTU: 1119 ifr->ifr_mtu = ifp->if_mtu; 1120 break; 1121 #endif 1122 #ifdef SLIOCGETMTU 1123 case SLIOCGETMTU: 1124 *(short *)data = ifp->if_mtu; 1125 break; 1126 #endif 1127 case SIOCADDMULTI: 1128 case SIOCDELMULTI: 1129 break; 1130 1131 case SPPPSETAUTHCFG: 1132 case SPPPGETAUTHCFG: 1133 case SPPPSETLCPCFG: 1134 case SPPPGETLCPCFG: 1135 case SPPPSETIDLETO: 1136 case SPPPSETAUTHFAILURE: 1137 case SPPPGETAUTHFAILURES: 1138 case SPPPSETDNSOPTS: 1139 case SPPPSETKEEPALIVE: 1140 { 1141 struct proc *p = curproc; /* XXX */ 1142 1143 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1144 break; 1145 } 1146 /* FALLTHROUGH */ 1147 case SPPPGETSTATUS: 1148 case SPPPGETSTATUSNCP: 1149 case SPPPGETIDLETO: 1150 case SPPPGETDNSOPTS: 1151 case SPPPGETDNSADDRS: 1152 case SPPPGETKEEPALIVE: 1153 error = sppp_params(sp, cmd, data); 1154 break; 1155 1156 default: 1157 error = ENOTTY; 1158 } 1159 splx(s); 1160 return (error); 1161 } 1162 1163 1164 /* 1165 * Cisco framing implementation. 1166 */ 1167 1168 /* 1169 * Handle incoming Cisco keepalive protocol packets. 1170 */ 1171 static void 1172 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1173 { 1174 STDDCL; 1175 struct cisco_packet *h; 1176 #ifdef INET 1177 u_int32_t me, mymask; 1178 #endif 1179 1180 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1181 if (debug) 1182 log(LOG_DEBUG, 1183 "%s: cisco invalid packet length: %d bytes\n", 1184 ifp->if_xname, m->m_pkthdr.len); 1185 return; 1186 } 1187 h = mtod(m, struct cisco_packet *); 1188 if (debug) 1189 log(LOG_DEBUG, 1190 "%s: cisco input: %d bytes " 1191 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1192 ifp->if_xname, m->m_pkthdr.len, 1193 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1194 (u_int)h->time0, (u_int)h->time1); 1195 switch (ntohl(h->type)) { 1196 default: 1197 if (debug) 1198 addlog("%s: cisco unknown packet type: 0x%x\n", 1199 ifp->if_xname, ntohl(h->type)); 1200 break; 1201 case CISCO_ADDR_REPLY: 1202 /* Reply on address request, ignore */ 1203 break; 1204 case CISCO_KEEPALIVE_REQ: 1205 sp->pp_alivecnt = 0; 1206 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1207 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1208 /* Local and remote sequence numbers are equal. 1209 * Probably, the line is in loopback mode. */ 1210 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1211 printf ("%s: loopback\n", 1212 ifp->if_xname); 1213 sp->pp_loopcnt = 0; 1214 if (ifp->if_flags & IFF_UP) { 1215 if_down(ifp); 1216 IF_PURGE(&sp->pp_cpq); 1217 } 1218 } 1219 ++sp->pp_loopcnt; 1220 1221 /* Generate new local sequence number */ 1222 sp->pp_seq[IDX_LCP] = arc4random(); 1223 break; 1224 } 1225 sp->pp_loopcnt = 0; 1226 if (! (ifp->if_flags & IFF_UP) && 1227 (ifp->if_flags & IFF_RUNNING)) { 1228 if_up(ifp); 1229 } 1230 break; 1231 case CISCO_ADDR_REQ: 1232 #ifdef INET 1233 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1234 if (me != 0L) 1235 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1236 #endif 1237 break; 1238 } 1239 } 1240 1241 /* 1242 * Send Cisco keepalive packet. 1243 */ 1244 static void 1245 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1246 { 1247 STDDCL; 1248 struct ppp_header *h; 1249 struct cisco_packet *ch; 1250 struct mbuf *m; 1251 u_int32_t t; 1252 1253 t = time_uptime * 1000; 1254 MGETHDR(m, M_DONTWAIT, MT_DATA); 1255 if (! m) 1256 return; 1257 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1258 m->m_pkthdr.rcvif = 0; 1259 1260 h = mtod(m, struct ppp_header *); 1261 h->address = CISCO_MULTICAST; 1262 h->control = 0; 1263 h->protocol = htons(CISCO_KEEPALIVE); 1264 1265 ch = (struct cisco_packet *)(h + 1); 1266 ch->type = htonl(type); 1267 ch->par1 = htonl(par1); 1268 ch->par2 = htonl(par2); 1269 ch->rel = -1; 1270 1271 ch->time0 = htons((u_short)(t >> 16)); 1272 ch->time1 = htons((u_short) t); 1273 1274 if (debug) 1275 log(LOG_DEBUG, 1276 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1277 ifp->if_xname, ntohl(ch->type), ch->par1, 1278 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1279 (u_int)ch->time1); 1280 1281 if (IF_QFULL(&sp->pp_cpq)) { 1282 IF_DROP(&sp->pp_fastq); 1283 IF_DROP(&ifp->if_snd); 1284 m_freem(m); 1285 ++ifp->if_oerrors; 1286 return; 1287 } else 1288 IF_ENQUEUE(&sp->pp_cpq, m); 1289 if (! (ifp->if_flags & IFF_OACTIVE)) 1290 (*ifp->if_start)(ifp); 1291 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1292 } 1293 1294 /* 1295 * PPP protocol implementation. 1296 */ 1297 1298 /* 1299 * Send PPP control protocol packet. 1300 */ 1301 static void 1302 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1303 u_char ident, u_short len, void *data) 1304 { 1305 STDDCL; 1306 struct lcp_header *lh; 1307 struct mbuf *m; 1308 size_t pkthdrlen; 1309 1310 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1311 1312 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1313 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1314 MGETHDR(m, M_DONTWAIT, MT_DATA); 1315 if (! m) 1316 return; 1317 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1318 m->m_pkthdr.rcvif = 0; 1319 1320 if (sp->pp_flags & PP_NOFRAMING) { 1321 *mtod(m, u_int16_t *) = htons(proto); 1322 lh = (struct lcp_header *)(mtod(m, u_int8_t *) + 2); 1323 } else { 1324 struct ppp_header *h; 1325 h = mtod(m, struct ppp_header *); 1326 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1327 h->control = PPP_UI; /* Unnumbered Info */ 1328 h->protocol = htons(proto); /* Link Control Protocol */ 1329 lh = (struct lcp_header *)(h + 1); 1330 } 1331 lh->type = type; 1332 lh->ident = ident; 1333 lh->len = htons(LCP_HEADER_LEN + len); 1334 if (len) 1335 bcopy (data, lh + 1, len); 1336 1337 if (debug) { 1338 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1339 ifp->if_xname, 1340 sppp_proto_name(proto), 1341 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1342 if (len) 1343 sppp_print_bytes((u_char *)(lh + 1), len); 1344 addlog(">\n"); 1345 } 1346 if (IF_QFULL(&sp->pp_cpq)) { 1347 IF_DROP(&sp->pp_fastq); 1348 IF_DROP(&ifp->if_snd); 1349 m_freem(m); 1350 ++ifp->if_oerrors; 1351 return; 1352 } else 1353 IF_ENQUEUE(&sp->pp_cpq, m); 1354 if (! (ifp->if_flags & IFF_OACTIVE)) 1355 (*ifp->if_start)(ifp); 1356 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1357 } 1358 1359 /* 1360 * Handle incoming PPP control protocol packets. 1361 */ 1362 static void 1363 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1364 { 1365 STDDCL; 1366 struct lcp_header *h; 1367 int len = m->m_pkthdr.len; 1368 int rv; 1369 u_char *p; 1370 u_int32_t u32; 1371 1372 if (len < 4) { 1373 if (debug) 1374 log(LOG_DEBUG, 1375 "%s: %s invalid packet length: %d bytes\n", 1376 ifp->if_xname, cp->name, len); 1377 return; 1378 } 1379 h = mtod(m, struct lcp_header *); 1380 if (debug) { 1381 log(LOG_DEBUG, 1382 "%s: %s input(%s): <%s id=0x%x len=%d", 1383 ifp->if_xname, cp->name, 1384 sppp_state_name(sp->state[cp->protoidx]), 1385 sppp_cp_type_name(h->type), h->ident, ntohs(h->len)); 1386 if (len > 4) 1387 sppp_print_bytes((u_char *)(h + 1), len - 4); 1388 addlog(">\n"); 1389 } 1390 if (len > ntohs(h->len)) 1391 len = ntohs(h->len); 1392 p = (u_char *)(h + 1); 1393 switch (h->type) { 1394 case CONF_REQ: 1395 if (len < 4) { 1396 if (debug) 1397 addlog("%s: %s invalid conf-req length %d\n", 1398 ifp->if_xname, cp->name, 1399 len); 1400 ++ifp->if_ierrors; 1401 break; 1402 } 1403 /* handle states where RCR doesn't get a SCA/SCN */ 1404 switch (sp->state[cp->protoidx]) { 1405 case STATE_CLOSING: 1406 case STATE_STOPPING: 1407 return; 1408 case STATE_CLOSED: 1409 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1410 0, 0); 1411 return; 1412 } 1413 rv = (cp->RCR)(sp, h, len); 1414 switch (sp->state[cp->protoidx]) { 1415 case STATE_OPENED: 1416 (cp->tld)(sp); 1417 (cp->scr)(sp); 1418 /* fall through... */ 1419 case STATE_ACK_SENT: 1420 case STATE_REQ_SENT: 1421 sppp_cp_change_state(cp, sp, rv? 1422 STATE_ACK_SENT: STATE_REQ_SENT); 1423 break; 1424 case STATE_STOPPED: 1425 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1426 (cp->scr)(sp); 1427 sppp_cp_change_state(cp, sp, rv? 1428 STATE_ACK_SENT: STATE_REQ_SENT); 1429 break; 1430 case STATE_ACK_RCVD: 1431 if (rv) { 1432 sppp_cp_change_state(cp, sp, STATE_OPENED); 1433 if (debug) 1434 log(LOG_DEBUG, "%s: %s tlu\n", 1435 ifp->if_xname, 1436 cp->name); 1437 (cp->tlu)(sp); 1438 } else 1439 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1440 break; 1441 default: 1442 printf("%s: %s illegal %s in state %s\n", 1443 ifp->if_xname, cp->name, 1444 sppp_cp_type_name(h->type), 1445 sppp_state_name(sp->state[cp->protoidx])); 1446 ++ifp->if_ierrors; 1447 } 1448 break; 1449 case CONF_ACK: 1450 if (h->ident != sp->confid[cp->protoidx]) { 1451 if (debug) 1452 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1453 ifp->if_xname, cp->name, 1454 h->ident, sp->confid[cp->protoidx]); 1455 ++ifp->if_ierrors; 1456 break; 1457 } 1458 switch (sp->state[cp->protoidx]) { 1459 case STATE_CLOSED: 1460 case STATE_STOPPED: 1461 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1462 break; 1463 case STATE_CLOSING: 1464 case STATE_STOPPING: 1465 break; 1466 case STATE_REQ_SENT: 1467 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1468 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1469 break; 1470 case STATE_OPENED: 1471 (cp->tld)(sp); 1472 /* fall through */ 1473 case STATE_ACK_RCVD: 1474 (cp->scr)(sp); 1475 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1476 break; 1477 case STATE_ACK_SENT: 1478 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1479 sppp_cp_change_state(cp, sp, STATE_OPENED); 1480 if (debug) 1481 log(LOG_DEBUG, "%s: %s tlu\n", 1482 ifp->if_xname, cp->name); 1483 (cp->tlu)(sp); 1484 break; 1485 default: 1486 printf("%s: %s illegal %s in state %s\n", 1487 ifp->if_xname, cp->name, 1488 sppp_cp_type_name(h->type), 1489 sppp_state_name(sp->state[cp->protoidx])); 1490 ++ifp->if_ierrors; 1491 } 1492 break; 1493 case CONF_NAK: 1494 case CONF_REJ: 1495 if (h->ident != sp->confid[cp->protoidx]) { 1496 if (debug) 1497 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1498 ifp->if_xname, cp->name, 1499 h->ident, sp->confid[cp->protoidx]); 1500 ++ifp->if_ierrors; 1501 break; 1502 } 1503 if (h->type == CONF_NAK) 1504 (cp->RCN_nak)(sp, h, len); 1505 else /* CONF_REJ */ 1506 (cp->RCN_rej)(sp, h, len); 1507 1508 switch (sp->state[cp->protoidx]) { 1509 case STATE_CLOSED: 1510 case STATE_STOPPED: 1511 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1512 break; 1513 case STATE_REQ_SENT: 1514 case STATE_ACK_SENT: 1515 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1516 (cp->scr)(sp); 1517 break; 1518 case STATE_OPENED: 1519 (cp->tld)(sp); 1520 /* fall through */ 1521 case STATE_ACK_RCVD: 1522 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1523 (cp->scr)(sp); 1524 break; 1525 case STATE_CLOSING: 1526 case STATE_STOPPING: 1527 break; 1528 default: 1529 printf("%s: %s illegal %s in state %s\n", 1530 ifp->if_xname, cp->name, 1531 sppp_cp_type_name(h->type), 1532 sppp_state_name(sp->state[cp->protoidx])); 1533 ++ifp->if_ierrors; 1534 } 1535 break; 1536 1537 case TERM_REQ: 1538 switch (sp->state[cp->protoidx]) { 1539 case STATE_ACK_RCVD: 1540 case STATE_ACK_SENT: 1541 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1542 /* fall through */ 1543 case STATE_CLOSED: 1544 case STATE_STOPPED: 1545 case STATE_CLOSING: 1546 case STATE_STOPPING: 1547 case STATE_REQ_SENT: 1548 sta: 1549 /* Send Terminate-Ack packet. */ 1550 if (debug) 1551 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1552 ifp->if_xname, cp->name); 1553 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1554 break; 1555 case STATE_OPENED: 1556 (cp->tld)(sp); 1557 sp->rst_counter[cp->protoidx] = 0; 1558 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1559 goto sta; 1560 default: 1561 printf("%s: %s illegal %s in state %s\n", 1562 ifp->if_xname, cp->name, 1563 sppp_cp_type_name(h->type), 1564 sppp_state_name(sp->state[cp->protoidx])); 1565 ++ifp->if_ierrors; 1566 } 1567 break; 1568 case TERM_ACK: 1569 switch (sp->state[cp->protoidx]) { 1570 case STATE_CLOSED: 1571 case STATE_STOPPED: 1572 case STATE_REQ_SENT: 1573 case STATE_ACK_SENT: 1574 break; 1575 case STATE_CLOSING: 1576 (cp->tlf)(sp); 1577 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1578 sppp_lcp_check_and_close(sp); 1579 break; 1580 case STATE_STOPPING: 1581 (cp->tlf)(sp); 1582 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1583 sppp_lcp_check_and_close(sp); 1584 break; 1585 case STATE_ACK_RCVD: 1586 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1587 break; 1588 case STATE_OPENED: 1589 (cp->tld)(sp); 1590 (cp->scr)(sp); 1591 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1592 break; 1593 default: 1594 printf("%s: %s illegal %s in state %s\n", 1595 ifp->if_xname, cp->name, 1596 sppp_cp_type_name(h->type), 1597 sppp_state_name(sp->state[cp->protoidx])); 1598 ++ifp->if_ierrors; 1599 } 1600 break; 1601 case CODE_REJ: 1602 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1603 log(LOG_INFO, 1604 "%s: %s: ignoring RXJ (%s) for code ?, " 1605 "danger will robinson\n", 1606 ifp->if_xname, cp->name, 1607 sppp_cp_type_name(h->type)); 1608 switch (sp->state[cp->protoidx]) { 1609 case STATE_CLOSED: 1610 case STATE_STOPPED: 1611 case STATE_REQ_SENT: 1612 case STATE_ACK_SENT: 1613 case STATE_CLOSING: 1614 case STATE_STOPPING: 1615 case STATE_OPENED: 1616 break; 1617 case STATE_ACK_RCVD: 1618 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1619 break; 1620 default: 1621 printf("%s: %s illegal %s in state %s\n", 1622 ifp->if_xname, cp->name, 1623 sppp_cp_type_name(h->type), 1624 sppp_state_name(sp->state[cp->protoidx])); 1625 ++ifp->if_ierrors; 1626 } 1627 break; 1628 case PROTO_REJ: 1629 { 1630 int catastrophic; 1631 const struct cp *upper; 1632 int i; 1633 u_int16_t proto; 1634 1635 catastrophic = 0; 1636 upper = NULL; 1637 proto = p[0] << 8 | p[1]; 1638 for (i = 0; i < IDX_COUNT; i++) { 1639 if (cps[i]->proto == proto) { 1640 upper = cps[i]; 1641 break; 1642 } 1643 } 1644 if (upper == NULL) 1645 catastrophic++; 1646 1647 if (debug) 1648 log(LOG_INFO, 1649 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1650 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1651 sppp_cp_type_name(h->type), proto, 1652 upper ? upper->name : "unknown", 1653 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1654 1655 /* 1656 * if we got RXJ+ against conf-req, the peer does not implement 1657 * this particular protocol type. terminate the protocol. 1658 */ 1659 if (upper && !catastrophic) { 1660 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1661 upper->Close(sp); 1662 break; 1663 } 1664 } 1665 1666 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1667 switch (sp->state[cp->protoidx]) { 1668 case STATE_CLOSED: 1669 case STATE_STOPPED: 1670 case STATE_REQ_SENT: 1671 case STATE_ACK_SENT: 1672 case STATE_CLOSING: 1673 case STATE_STOPPING: 1674 case STATE_OPENED: 1675 break; 1676 case STATE_ACK_RCVD: 1677 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1678 break; 1679 default: 1680 printf("%s: %s illegal %s in state %s\n", 1681 ifp->if_xname, cp->name, 1682 sppp_cp_type_name(h->type), 1683 sppp_state_name(sp->state[cp->protoidx])); 1684 ++ifp->if_ierrors; 1685 } 1686 break; 1687 } 1688 case DISC_REQ: 1689 if (cp->proto != PPP_LCP) 1690 goto illegal; 1691 /* Discard the packet. */ 1692 break; 1693 case ECHO_REQ: 1694 if (cp->proto != PPP_LCP) 1695 goto illegal; 1696 if (sp->state[cp->protoidx] != STATE_OPENED) { 1697 if (debug) 1698 addlog("%s: lcp echo req but lcp closed\n", 1699 ifp->if_xname); 1700 ++ifp->if_ierrors; 1701 break; 1702 } 1703 if (len < 8) { 1704 if (debug) 1705 addlog("%s: invalid lcp echo request " 1706 "packet length: %d bytes\n", 1707 ifp->if_xname, len); 1708 break; 1709 } 1710 memcpy(&u32, h + 1, sizeof u32); 1711 if (ntohl(u32) == sp->lcp.magic) { 1712 /* Line loopback mode detected. */ 1713 printf("%s: loopback\n", ifp->if_xname); 1714 if_down(ifp); 1715 IF_PURGE(&sp->pp_cpq); 1716 1717 /* Shut down the PPP link. */ 1718 /* XXX */ 1719 lcp.Down(sp); 1720 lcp.Up(sp); 1721 break; 1722 } 1723 u32 = htonl(sp->lcp.magic); 1724 memcpy(h + 1, &u32, sizeof u32); 1725 if (debug) 1726 addlog("%s: got lcp echo req, sending echo rep\n", 1727 ifp->if_xname); 1728 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1729 h + 1); 1730 break; 1731 case ECHO_REPLY: 1732 if (cp->proto != PPP_LCP) 1733 goto illegal; 1734 if (h->ident != sp->lcp.echoid) { 1735 ++ifp->if_ierrors; 1736 break; 1737 } 1738 if (len < 8) { 1739 if (debug) 1740 addlog("%s: lcp invalid echo reply " 1741 "packet length: %d bytes\n", 1742 ifp->if_xname, len); 1743 break; 1744 } 1745 if (debug) 1746 addlog("%s: lcp got echo rep\n", 1747 ifp->if_xname); 1748 memcpy(&u32, h + 1, sizeof u32); 1749 if (ntohl(u32) != sp->lcp.magic) 1750 sp->pp_alivecnt = 0; 1751 break; 1752 default: 1753 /* Unknown packet type -- send Code-Reject packet. */ 1754 illegal: 1755 if (debug) 1756 addlog("%s: %s send code-rej for 0x%x\n", 1757 ifp->if_xname, cp->name, h->type); 1758 sppp_cp_send(sp, cp->proto, CODE_REJ, 1759 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1760 ++ifp->if_ierrors; 1761 } 1762 } 1763 1764 1765 /* 1766 * The generic part of all Up/Down/Open/Close/TO event handlers. 1767 * Basically, the state transition handling in the automaton. 1768 */ 1769 static void 1770 sppp_up_event(const struct cp *cp, struct sppp *sp) 1771 { 1772 STDDCL; 1773 1774 if (debug) 1775 log(LOG_DEBUG, "%s: %s up(%s)\n", 1776 ifp->if_xname, cp->name, 1777 sppp_state_name(sp->state[cp->protoidx])); 1778 1779 switch (sp->state[cp->protoidx]) { 1780 case STATE_INITIAL: 1781 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1782 break; 1783 case STATE_STARTING: 1784 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1785 (cp->scr)(sp); 1786 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1787 break; 1788 default: 1789 printf("%s: %s illegal up in state %s\n", 1790 ifp->if_xname, cp->name, 1791 sppp_state_name(sp->state[cp->protoidx])); 1792 } 1793 } 1794 1795 static void 1796 sppp_down_event(const struct cp *cp, struct sppp *sp) 1797 { 1798 STDDCL; 1799 1800 if (debug) 1801 log(LOG_DEBUG, "%s: %s down(%s)\n", 1802 ifp->if_xname, cp->name, 1803 sppp_state_name(sp->state[cp->protoidx])); 1804 1805 switch (sp->state[cp->protoidx]) { 1806 case STATE_CLOSED: 1807 case STATE_CLOSING: 1808 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1809 break; 1810 case STATE_STOPPED: 1811 (cp->tls)(sp); 1812 /* fall through */ 1813 case STATE_STOPPING: 1814 case STATE_REQ_SENT: 1815 case STATE_ACK_RCVD: 1816 case STATE_ACK_SENT: 1817 sppp_cp_change_state(cp, sp, STATE_STARTING); 1818 break; 1819 case STATE_OPENED: 1820 (cp->tld)(sp); 1821 sppp_cp_change_state(cp, sp, STATE_STARTING); 1822 break; 1823 default: 1824 printf("%s: %s illegal down in state %s\n", 1825 ifp->if_xname, cp->name, 1826 sppp_state_name(sp->state[cp->protoidx])); 1827 } 1828 } 1829 1830 1831 static void 1832 sppp_open_event(const struct cp *cp, struct sppp *sp) 1833 { 1834 STDDCL; 1835 1836 if (debug) 1837 log(LOG_DEBUG, "%s: %s open(%s)\n", 1838 ifp->if_xname, cp->name, 1839 sppp_state_name(sp->state[cp->protoidx])); 1840 1841 switch (sp->state[cp->protoidx]) { 1842 case STATE_INITIAL: 1843 (cp->tls)(sp); 1844 sppp_cp_change_state(cp, sp, STATE_STARTING); 1845 break; 1846 case STATE_STARTING: 1847 break; 1848 case STATE_CLOSED: 1849 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1850 (cp->scr)(sp); 1851 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1852 break; 1853 case STATE_STOPPED: 1854 case STATE_STOPPING: 1855 case STATE_REQ_SENT: 1856 case STATE_ACK_RCVD: 1857 case STATE_ACK_SENT: 1858 case STATE_OPENED: 1859 break; 1860 case STATE_CLOSING: 1861 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1862 break; 1863 } 1864 } 1865 1866 1867 static void 1868 sppp_close_event(const struct cp *cp, struct sppp *sp) 1869 { 1870 STDDCL; 1871 1872 if (debug) 1873 log(LOG_DEBUG, "%s: %s close(%s)\n", 1874 ifp->if_xname, cp->name, 1875 sppp_state_name(sp->state[cp->protoidx])); 1876 1877 switch (sp->state[cp->protoidx]) { 1878 case STATE_INITIAL: 1879 case STATE_CLOSED: 1880 case STATE_CLOSING: 1881 break; 1882 case STATE_STARTING: 1883 (cp->tlf)(sp); 1884 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1885 break; 1886 case STATE_STOPPED: 1887 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1888 break; 1889 case STATE_STOPPING: 1890 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1891 break; 1892 case STATE_OPENED: 1893 (cp->tld)(sp); 1894 /* fall through */ 1895 case STATE_REQ_SENT: 1896 case STATE_ACK_RCVD: 1897 case STATE_ACK_SENT: 1898 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1899 sppp_cp_send(sp, cp->proto, TERM_REQ, 1900 ++sp->pp_seq[cp->protoidx], 0, 0); 1901 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1902 break; 1903 } 1904 } 1905 1906 static void 1907 sppp_to_event(const struct cp *cp, struct sppp *sp) 1908 { 1909 STDDCL; 1910 int s; 1911 1912 s = splnet(); 1913 if (debug) 1914 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1915 ifp->if_xname, cp->name, 1916 sppp_state_name(sp->state[cp->protoidx]), 1917 sp->rst_counter[cp->protoidx]); 1918 1919 if (--sp->rst_counter[cp->protoidx] < 0) 1920 /* TO- event */ 1921 switch (sp->state[cp->protoidx]) { 1922 case STATE_CLOSING: 1923 (cp->tlf)(sp); 1924 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1925 sppp_lcp_check_and_close(sp); 1926 break; 1927 case STATE_STOPPING: 1928 (cp->tlf)(sp); 1929 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1930 sppp_lcp_check_and_close(sp); 1931 break; 1932 case STATE_REQ_SENT: 1933 case STATE_ACK_RCVD: 1934 case STATE_ACK_SENT: 1935 (cp->tlf)(sp); 1936 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1937 sppp_lcp_check_and_close(sp); 1938 break; 1939 } 1940 else 1941 /* TO+ event */ 1942 switch (sp->state[cp->protoidx]) { 1943 case STATE_CLOSING: 1944 case STATE_STOPPING: 1945 sppp_cp_send(sp, cp->proto, TERM_REQ, 1946 ++sp->pp_seq[cp->protoidx], 0, 0); 1947 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1948 cp->TO, sp); 1949 break; 1950 case STATE_REQ_SENT: 1951 case STATE_ACK_RCVD: 1952 (cp->scr)(sp); 1953 /* sppp_cp_change_state() will restart the timer */ 1954 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1955 break; 1956 case STATE_ACK_SENT: 1957 (cp->scr)(sp); 1958 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1959 cp->TO, sp); 1960 break; 1961 } 1962 1963 splx(s); 1964 } 1965 1966 /* 1967 * Change the state of a control protocol in the state automaton. 1968 * Takes care of starting/stopping the restart timer. 1969 */ 1970 void 1971 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1972 { 1973 sp->state[cp->protoidx] = newstate; 1974 callout_stop(&sp->ch[cp->protoidx]); 1975 switch (newstate) { 1976 case STATE_INITIAL: 1977 case STATE_STARTING: 1978 case STATE_CLOSED: 1979 case STATE_STOPPED: 1980 case STATE_OPENED: 1981 break; 1982 case STATE_CLOSING: 1983 case STATE_STOPPING: 1984 case STATE_REQ_SENT: 1985 case STATE_ACK_RCVD: 1986 case STATE_ACK_SENT: 1987 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1988 cp->TO, sp); 1989 break; 1990 } 1991 } 1992 1993 /* 1994 *--------------------------------------------------------------------------* 1995 * * 1996 * The LCP implementation. * 1997 * * 1998 *--------------------------------------------------------------------------* 1999 */ 2000 static void 2001 sppp_lcp_init(struct sppp *sp) 2002 { 2003 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2004 sp->lcp.magic = 0; 2005 sp->state[IDX_LCP] = STATE_INITIAL; 2006 sp->fail_counter[IDX_LCP] = 0; 2007 sp->pp_seq[IDX_LCP] = 0; 2008 sp->pp_rseq[IDX_LCP] = 0; 2009 sp->lcp.protos = 0; 2010 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 2011 2012 /* 2013 * Initialize counters and timeout values. Note that we don't 2014 * use the 3 seconds suggested in RFC 1661 since we are likely 2015 * running on a fast link. XXX We should probably implement 2016 * the exponential backoff option. Note that these values are 2017 * relevant for all control protocols, not just LCP only. 2018 */ 2019 sp->lcp.timeout = 1 * hz; 2020 sp->lcp.max_terminate = 2; 2021 sp->lcp.max_configure = 10; 2022 sp->lcp.max_failure = 10; 2023 callout_init(&sp->ch[IDX_LCP]); 2024 } 2025 2026 static void 2027 sppp_lcp_up(struct sppp *sp) 2028 { 2029 STDDCL; 2030 2031 /* Initialize activity timestamp: opening a connection is an activity */ 2032 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 2033 2034 /* 2035 * If this interface is passive or dial-on-demand, and we are 2036 * still in Initial state, it means we've got an incoming 2037 * call. Activate the interface. 2038 */ 2039 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2040 if (debug) 2041 log(LOG_DEBUG, 2042 "%s: Up event", ifp->if_xname); 2043 ifp->if_flags |= IFF_RUNNING; 2044 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2045 if (debug) 2046 addlog("(incoming call)\n"); 2047 sp->pp_flags |= PP_CALLIN; 2048 lcp.Open(sp); 2049 } else if (debug) 2050 addlog("\n"); 2051 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2052 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2053 ifp->if_flags |= IFF_RUNNING; 2054 lcp.Open(sp); 2055 } 2056 2057 sppp_up_event(&lcp, sp); 2058 } 2059 2060 static void 2061 sppp_lcp_down(struct sppp *sp) 2062 { 2063 STDDCL; 2064 2065 sppp_down_event(&lcp, sp); 2066 2067 /* 2068 * If this is neither a dial-on-demand nor a passive 2069 * interface, simulate an ``ifconfig down'' action, so the 2070 * administrator can force a redial by another ``ifconfig 2071 * up''. XXX For leased line operation, should we immediately 2072 * try to reopen the connection here? 2073 */ 2074 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2075 if (debug) 2076 log(LOG_INFO, 2077 "%s: Down event (carrier loss), taking interface down.\n", 2078 ifp->if_xname); 2079 if_down(ifp); 2080 } else { 2081 if (debug) 2082 log(LOG_DEBUG, 2083 "%s: Down event (carrier loss)\n", 2084 ifp->if_xname); 2085 } 2086 sp->pp_flags &= ~PP_CALLIN; 2087 if (sp->state[IDX_LCP] != STATE_INITIAL) 2088 lcp.Close(sp); 2089 ifp->if_flags &= ~IFF_RUNNING; 2090 } 2091 2092 static void 2093 sppp_lcp_open(struct sppp *sp) 2094 { 2095 /* 2096 * If we are authenticator, negotiate LCP_AUTH 2097 */ 2098 if (sp->hisauth.proto != 0) 2099 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2100 else 2101 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2102 sp->pp_flags &= ~PP_NEEDAUTH; 2103 sppp_open_event(&lcp, sp); 2104 } 2105 2106 static void 2107 sppp_lcp_close(struct sppp *sp) 2108 { 2109 sppp_close_event(&lcp, sp); 2110 } 2111 2112 static void 2113 sppp_lcp_TO(void *cookie) 2114 { 2115 sppp_to_event(&lcp, (struct sppp *)cookie); 2116 } 2117 2118 /* 2119 * Analyze a configure request. Return true if it was agreeable, and 2120 * caused action sca, false if it has been rejected or nak'ed, and 2121 * caused action scn. (The return value is used to make the state 2122 * transition decision in the state automaton.) 2123 */ 2124 static int 2125 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2126 { 2127 STDDCL; 2128 u_char *buf, *r, *p; 2129 int origlen, rlen; 2130 u_int32_t nmagic; 2131 u_short authproto; 2132 2133 len -= 4; 2134 origlen = len; 2135 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2136 if (! buf) 2137 return (0); 2138 2139 if (debug) 2140 log(LOG_DEBUG, "%s: lcp parse opts:", 2141 ifp->if_xname); 2142 2143 /* pass 1: check for things that need to be rejected */ 2144 p = (void *)(h + 1); 2145 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2146 if (debug) 2147 addlog(" %s", sppp_lcp_opt_name(*p)); 2148 switch (*p) { 2149 case LCP_OPT_MAGIC: 2150 /* Magic number. */ 2151 /* fall through, both are same length */ 2152 case LCP_OPT_ASYNC_MAP: 2153 /* Async control character map. */ 2154 if (len >= 6 || p[1] == 6) 2155 continue; 2156 if (debug) 2157 addlog(" [invalid]"); 2158 break; 2159 case LCP_OPT_MRU: 2160 /* Maximum receive unit. */ 2161 if (len >= 4 && p[1] == 4) 2162 continue; 2163 if (debug) 2164 addlog(" [invalid]"); 2165 break; 2166 case LCP_OPT_AUTH_PROTO: 2167 if (len < 4) { 2168 if (debug) 2169 addlog(" [invalid]"); 2170 break; 2171 } 2172 authproto = (p[2] << 8) + p[3]; 2173 if (authproto == PPP_CHAP && p[1] != 5) { 2174 if (debug) 2175 addlog(" [invalid chap len]"); 2176 break; 2177 } 2178 if (sp->myauth.proto == 0) { 2179 /* we are not configured to do auth */ 2180 if (debug) 2181 addlog(" [not configured]"); 2182 break; 2183 } 2184 /* 2185 * Remote want us to authenticate, remember this, 2186 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2187 * up. 2188 */ 2189 sp->pp_flags |= PP_NEEDAUTH; 2190 continue; 2191 default: 2192 /* Others not supported. */ 2193 if (debug) 2194 addlog(" [rej]"); 2195 break; 2196 } 2197 /* Add the option to rejected list. */ 2198 bcopy (p, r, p[1]); 2199 r += p[1]; 2200 rlen += p[1]; 2201 } 2202 if (rlen) { 2203 if (debug) 2204 addlog(" send conf-rej\n"); 2205 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2206 goto end; 2207 } else if (debug) 2208 addlog("\n"); 2209 2210 /* 2211 * pass 2: check for option values that are unacceptable and 2212 * thus require to be nak'ed. 2213 */ 2214 if (debug) 2215 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2216 ifp->if_xname); 2217 2218 p = (void *)(h + 1); 2219 len = origlen; 2220 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2221 if (debug) 2222 addlog(" %s", sppp_lcp_opt_name(*p)); 2223 switch (*p) { 2224 case LCP_OPT_MAGIC: 2225 /* Magic number -- extract. */ 2226 nmagic = (u_int32_t)p[2] << 24 | 2227 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2228 if (nmagic != sp->lcp.magic) { 2229 if (debug) 2230 addlog(" 0x%x", nmagic); 2231 continue; 2232 } 2233 /* 2234 * Local and remote magics equal -- loopback? 2235 */ 2236 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2237 printf ("%s: loopback\n", 2238 ifp->if_xname); 2239 sp->pp_loopcnt = 0; 2240 if (ifp->if_flags & IFF_UP) { 2241 if_down(ifp); 2242 IF_PURGE(&sp->pp_cpq); 2243 /* XXX ? */ 2244 lcp.Down(sp); 2245 lcp.Up(sp); 2246 } 2247 } else if (debug) 2248 addlog(" [glitch]"); 2249 ++sp->pp_loopcnt; 2250 /* 2251 * We negate our magic here, and NAK it. If 2252 * we see it later in an NAK packet, we 2253 * suggest a new one. 2254 */ 2255 nmagic = ~sp->lcp.magic; 2256 /* Gonna NAK it. */ 2257 p[2] = nmagic >> 24; 2258 p[3] = nmagic >> 16; 2259 p[4] = nmagic >> 8; 2260 p[5] = nmagic; 2261 break; 2262 2263 case LCP_OPT_ASYNC_MAP: 2264 /* 2265 * Async control character map -- just ignore it. 2266 * 2267 * Quote from RFC 1662, chapter 6: 2268 * To enable this functionality, synchronous PPP 2269 * implementations MUST always respond to the 2270 * Async-Control-Character-Map Configuration 2271 * Option with the LCP Configure-Ack. However, 2272 * acceptance of the Configuration Option does 2273 * not imply that the synchronous implementation 2274 * will do any ACCM mapping. Instead, all such 2275 * octet mapping will be performed by the 2276 * asynchronous-to-synchronous converter. 2277 */ 2278 continue; 2279 2280 case LCP_OPT_MRU: 2281 /* 2282 * Maximum receive unit. Always agreeable, 2283 * but ignored by now. 2284 */ 2285 sp->lcp.their_mru = p[2] * 256 + p[3]; 2286 if (debug) 2287 addlog(" %ld", sp->lcp.their_mru); 2288 continue; 2289 2290 case LCP_OPT_AUTH_PROTO: 2291 authproto = (p[2] << 8) + p[3]; 2292 if (sp->myauth.proto != authproto) { 2293 /* not agreed, nak */ 2294 if (debug) 2295 addlog(" [mine %s != his %s]", 2296 sppp_proto_name(sp->myauth.proto), 2297 sppp_proto_name(authproto)); 2298 p[2] = sp->myauth.proto >> 8; 2299 p[3] = sp->myauth.proto; 2300 break; 2301 } 2302 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2303 if (debug) 2304 addlog(" [chap not MD5]"); 2305 p[4] = CHAP_MD5; 2306 break; 2307 } 2308 continue; 2309 } 2310 /* Add the option to nak'ed list. */ 2311 bcopy (p, r, p[1]); 2312 r += p[1]; 2313 rlen += p[1]; 2314 } 2315 if (rlen) { 2316 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2317 if (debug) 2318 addlog(" max_failure (%d) exceeded, " 2319 "send conf-rej\n", 2320 sp->lcp.max_failure); 2321 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2322 } else { 2323 if (debug) 2324 addlog(" send conf-nak\n"); 2325 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2326 } 2327 goto end; 2328 } else { 2329 if (debug) 2330 addlog(" send conf-ack\n"); 2331 sp->fail_counter[IDX_LCP] = 0; 2332 sp->pp_loopcnt = 0; 2333 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2334 } 2335 2336 end: 2337 free(buf, M_TEMP); 2338 return (rlen == 0); 2339 } 2340 2341 /* 2342 * Analyze the LCP Configure-Reject option list, and adjust our 2343 * negotiation. 2344 */ 2345 static void 2346 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2347 { 2348 STDDCL; 2349 u_char *buf, *p; 2350 2351 len -= 4; 2352 buf = malloc (len, M_TEMP, M_NOWAIT); 2353 if (!buf) 2354 return; 2355 2356 if (debug) 2357 log(LOG_DEBUG, "%s: lcp rej opts:", 2358 ifp->if_xname); 2359 2360 p = (void *)(h + 1); 2361 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2362 if (debug) 2363 addlog(" %s", sppp_lcp_opt_name(*p)); 2364 switch (*p) { 2365 case LCP_OPT_MAGIC: 2366 /* Magic number -- can't use it, use 0 */ 2367 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2368 sp->lcp.magic = 0; 2369 break; 2370 case LCP_OPT_MRU: 2371 /* 2372 * Should not be rejected anyway, since we only 2373 * negotiate a MRU if explicitly requested by 2374 * peer. 2375 */ 2376 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2377 break; 2378 case LCP_OPT_AUTH_PROTO: 2379 /* 2380 * Peer doesn't want to authenticate himself, 2381 * deny unless this is a dialout call, and 2382 * SPPP_AUTHFLAG_NOCALLOUT is set. 2383 */ 2384 if ((sp->pp_flags & PP_CALLIN) == 0 && 2385 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2386 if (debug) 2387 addlog(" [don't insist on auth " 2388 "for callout]"); 2389 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2390 break; 2391 } 2392 if (debug) 2393 addlog("[access denied]\n"); 2394 lcp.Close(sp); 2395 break; 2396 } 2397 } 2398 if (debug) 2399 addlog("\n"); 2400 free(buf, M_TEMP); 2401 return; 2402 } 2403 2404 /* 2405 * Analyze the LCP Configure-NAK option list, and adjust our 2406 * negotiation. 2407 */ 2408 static void 2409 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2410 { 2411 STDDCL; 2412 u_char *buf, *p; 2413 u_int32_t magic; 2414 2415 len -= 4; 2416 buf = malloc (len, M_TEMP, M_NOWAIT); 2417 if (!buf) 2418 return; 2419 2420 if (debug) 2421 log(LOG_DEBUG, "%s: lcp nak opts:", 2422 ifp->if_xname); 2423 2424 p = (void *)(h + 1); 2425 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2426 if (debug) 2427 addlog(" %s", sppp_lcp_opt_name(*p)); 2428 switch (*p) { 2429 case LCP_OPT_MAGIC: 2430 /* Magic number -- renegotiate */ 2431 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2432 len >= 6 && p[1] == 6) { 2433 magic = (u_int32_t)p[2] << 24 | 2434 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2435 /* 2436 * If the remote magic is our negated one, 2437 * this looks like a loopback problem. 2438 * Suggest a new magic to make sure. 2439 */ 2440 if (magic == ~sp->lcp.magic) { 2441 if (debug) 2442 addlog(" magic glitch"); 2443 sp->lcp.magic = arc4random(); 2444 } else { 2445 sp->lcp.magic = magic; 2446 if (debug) 2447 addlog(" %d", magic); 2448 } 2449 } 2450 break; 2451 case LCP_OPT_MRU: 2452 /* 2453 * Peer wants to advise us to negotiate an MRU. 2454 * Agree on it if it's reasonable, or use 2455 * default otherwise. 2456 */ 2457 if (len >= 4 && p[1] == 4) { 2458 u_int mru = p[2] * 256 + p[3]; 2459 if (debug) 2460 addlog(" %d", mru); 2461 if (mru < PP_MTU || mru > PP_MAX_MRU) 2462 mru = PP_MTU; 2463 sp->lcp.mru = mru; 2464 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2465 } 2466 break; 2467 case LCP_OPT_AUTH_PROTO: 2468 /* 2469 * Peer doesn't like our authentication method, 2470 * deny. 2471 */ 2472 if (debug) 2473 addlog("[access denied]\n"); 2474 lcp.Close(sp); 2475 break; 2476 } 2477 } 2478 if (debug) 2479 addlog("\n"); 2480 free(buf, M_TEMP); 2481 return; 2482 } 2483 2484 static void 2485 sppp_lcp_tlu(struct sppp *sp) 2486 { 2487 STDDCL; 2488 int i; 2489 u_int32_t mask; 2490 2491 /* XXX ? */ 2492 if (! (ifp->if_flags & IFF_UP) && 2493 (ifp->if_flags & IFF_RUNNING)) { 2494 /* Coming out of loopback mode. */ 2495 if_up(ifp); 2496 } 2497 2498 for (i = 0; i < IDX_COUNT; i++) 2499 if ((cps[i])->flags & CP_QUAL) 2500 (cps[i])->Open(sp); 2501 2502 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2503 (sp->pp_flags & PP_NEEDAUTH) != 0) 2504 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2505 else 2506 sp->pp_phase = SPPP_PHASE_NETWORK; 2507 2508 if (debug) 2509 { 2510 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2511 sppp_phase_name(sp->pp_phase)); 2512 } 2513 2514 /* 2515 * Open all authentication protocols. This is even required 2516 * if we already proceeded to network phase, since it might be 2517 * that remote wants us to authenticate, so we might have to 2518 * send a PAP request. Undesired authentication protocols 2519 * don't do anything when they get an Open event. 2520 */ 2521 for (i = 0; i < IDX_COUNT; i++) 2522 if ((cps[i])->flags & CP_AUTH) 2523 (cps[i])->Open(sp); 2524 2525 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2526 /* Notify all NCPs. */ 2527 for (i = 0; i < IDX_COUNT; i++) 2528 if ((cps[i])->flags & CP_NCP) 2529 (cps[i])->Open(sp); 2530 } 2531 2532 /* Send Up events to all started protos. */ 2533 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2534 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2535 (cps[i])->Up(sp); 2536 2537 /* notify low-level driver of state change */ 2538 if (sp->pp_chg) 2539 sp->pp_chg(sp, (int)sp->pp_phase); 2540 2541 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2542 /* if no NCP is starting, close down */ 2543 sppp_lcp_check_and_close(sp); 2544 } 2545 2546 static void 2547 sppp_lcp_tld(struct sppp *sp) 2548 { 2549 STDDCL; 2550 int i; 2551 u_int32_t mask; 2552 2553 sp->pp_phase = SPPP_PHASE_TERMINATE; 2554 2555 if (debug) 2556 { 2557 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2558 sppp_phase_name(sp->pp_phase)); 2559 } 2560 2561 /* 2562 * Take upper layers down. We send the Down event first and 2563 * the Close second to prevent the upper layers from sending 2564 * ``a flurry of terminate-request packets'', as the RFC 2565 * describes it. 2566 */ 2567 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2568 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2569 (cps[i])->Down(sp); 2570 (cps[i])->Close(sp); 2571 } 2572 } 2573 2574 static void 2575 sppp_lcp_tls(struct sppp *sp) 2576 { 2577 STDDCL; 2578 2579 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2580 printf("%s: authentication failed %d times, not retrying again\n", 2581 sp->pp_if.if_xname, sp->pp_auth_failures); 2582 if_down(&sp->pp_if); 2583 return; 2584 } 2585 2586 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2587 2588 if (debug) 2589 { 2590 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2591 sppp_phase_name(sp->pp_phase)); 2592 } 2593 2594 /* Notify lower layer if desired. */ 2595 if (sp->pp_tls) 2596 (sp->pp_tls)(sp); 2597 } 2598 2599 static void 2600 sppp_lcp_tlf(struct sppp *sp) 2601 { 2602 STDDCL; 2603 2604 sp->pp_phase = SPPP_PHASE_DEAD; 2605 2606 if (debug) 2607 { 2608 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2609 sppp_phase_name(sp->pp_phase)); 2610 } 2611 2612 /* Notify lower layer if desired. */ 2613 if (sp->pp_tlf) 2614 (sp->pp_tlf)(sp); 2615 } 2616 2617 static void 2618 sppp_lcp_scr(struct sppp *sp) 2619 { 2620 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2621 int i = 0; 2622 u_short authproto; 2623 2624 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2625 if (! sp->lcp.magic) 2626 sp->lcp.magic = arc4random(); 2627 opt[i++] = LCP_OPT_MAGIC; 2628 opt[i++] = 6; 2629 opt[i++] = sp->lcp.magic >> 24; 2630 opt[i++] = sp->lcp.magic >> 16; 2631 opt[i++] = sp->lcp.magic >> 8; 2632 opt[i++] = sp->lcp.magic; 2633 } 2634 2635 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2636 opt[i++] = LCP_OPT_MRU; 2637 opt[i++] = 4; 2638 opt[i++] = sp->lcp.mru >> 8; 2639 opt[i++] = sp->lcp.mru; 2640 } 2641 2642 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2643 authproto = sp->hisauth.proto; 2644 opt[i++] = LCP_OPT_AUTH_PROTO; 2645 opt[i++] = authproto == PPP_CHAP? 5: 4; 2646 opt[i++] = authproto >> 8; 2647 opt[i++] = authproto; 2648 if (authproto == PPP_CHAP) 2649 opt[i++] = CHAP_MD5; 2650 } 2651 2652 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2653 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2654 } 2655 2656 /* 2657 * Check the open NCPs, return true if at least one NCP is open. 2658 */ 2659 static int 2660 sppp_ncp_check(struct sppp *sp) 2661 { 2662 int i, mask; 2663 2664 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2665 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2666 return 1; 2667 return 0; 2668 } 2669 2670 /* 2671 * Re-check the open NCPs and see if we should terminate the link. 2672 * Called by the NCPs during their tlf action handling. 2673 */ 2674 static void 2675 sppp_lcp_check_and_close(struct sppp *sp) 2676 { 2677 2678 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2679 /* don't bother, we are already going down */ 2680 return; 2681 2682 if (sppp_ncp_check(sp)) 2683 return; 2684 2685 lcp.Close(sp); 2686 } 2687 2688 2689 /* 2690 *--------------------------------------------------------------------------* 2691 * * 2692 * The IPCP implementation. * 2693 * * 2694 *--------------------------------------------------------------------------* 2695 */ 2696 2697 static void 2698 sppp_ipcp_init(struct sppp *sp) 2699 { 2700 sp->ipcp.opts = 0; 2701 sp->ipcp.flags = 0; 2702 sp->state[IDX_IPCP] = STATE_INITIAL; 2703 sp->fail_counter[IDX_IPCP] = 0; 2704 sp->pp_seq[IDX_IPCP] = 0; 2705 sp->pp_rseq[IDX_IPCP] = 0; 2706 callout_init(&sp->ch[IDX_IPCP]); 2707 } 2708 2709 static void 2710 sppp_ipcp_up(struct sppp *sp) 2711 { 2712 sppp_up_event(&ipcp, sp); 2713 } 2714 2715 static void 2716 sppp_ipcp_down(struct sppp *sp) 2717 { 2718 sppp_down_event(&ipcp, sp); 2719 } 2720 2721 static void 2722 sppp_ipcp_open(struct sppp *sp) 2723 { 2724 STDDCL; 2725 u_int32_t myaddr, hisaddr; 2726 2727 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2728 sp->ipcp.req_myaddr = 0; 2729 sp->ipcp.req_hisaddr = 0; 2730 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2731 2732 #ifdef INET 2733 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2734 #else 2735 myaddr = hisaddr = 0; 2736 #endif 2737 /* 2738 * If we don't have his address, this probably means our 2739 * interface doesn't want to talk IP at all. (This could 2740 * be the case if somebody wants to speak only IPX, for 2741 * example.) Don't open IPCP in this case. 2742 */ 2743 if (hisaddr == 0) { 2744 /* XXX this message should go away */ 2745 if (debug) 2746 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2747 ifp->if_xname); 2748 return; 2749 } 2750 2751 if (myaddr == 0) { 2752 /* 2753 * I don't have an assigned address, so i need to 2754 * negotiate my address. 2755 */ 2756 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2757 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2758 } 2759 if (hisaddr == 1) { 2760 /* 2761 * XXX - remove this hack! 2762 * remote has no valid address, we need to get one assigned. 2763 */ 2764 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2765 } 2766 sppp_open_event(&ipcp, sp); 2767 } 2768 2769 static void 2770 sppp_ipcp_close(struct sppp *sp) 2771 { 2772 STDDCL; 2773 2774 sppp_close_event(&ipcp, sp); 2775 #ifdef INET 2776 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2777 /* 2778 * Some address was dynamic, clear it again. 2779 */ 2780 sppp_clear_ip_addrs(sp); 2781 #endif 2782 2783 if (sp->pp_saved_mtu > 0) { 2784 ifp->if_mtu = sp->pp_saved_mtu; 2785 sp->pp_saved_mtu = 0; 2786 if (debug) 2787 log(LOG_DEBUG, 2788 "%s: resetting MTU to %" PRIu64 " bytes\n", 2789 ifp->if_xname, ifp->if_mtu); 2790 } 2791 } 2792 2793 static void 2794 sppp_ipcp_TO(void *cookie) 2795 { 2796 sppp_to_event(&ipcp, (struct sppp *)cookie); 2797 } 2798 2799 /* 2800 * Analyze a configure request. Return true if it was agreeable, and 2801 * caused action sca, false if it has been rejected or nak'ed, and 2802 * caused action scn. (The return value is used to make the state 2803 * transition decision in the state automaton.) 2804 */ 2805 static int 2806 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2807 { 2808 u_char *buf, *r, *p; 2809 struct ifnet *ifp = &sp->pp_if; 2810 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2811 u_int32_t hisaddr, desiredaddr; 2812 2813 len -= 4; 2814 origlen = len; 2815 /* 2816 * Make sure to allocate a buf that can at least hold a 2817 * conf-nak with an `address' option. We might need it below. 2818 */ 2819 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2820 if (! buf) 2821 return (0); 2822 2823 /* pass 1: see if we can recognize them */ 2824 if (debug) 2825 log(LOG_DEBUG, "%s: ipcp parse opts:", 2826 ifp->if_xname); 2827 p = (void *)(h + 1); 2828 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2829 if (debug) 2830 addlog(" %s", sppp_ipcp_opt_name(*p)); 2831 switch (*p) { 2832 #ifdef notyet 2833 case IPCP_OPT_COMPRESSION: 2834 if (len >= 6 && p[1] >= 6) { 2835 /* correctly formed compress option */ 2836 continue; 2837 } 2838 if (debug) 2839 addlog(" [invalid]"); 2840 break; 2841 #endif 2842 case IPCP_OPT_ADDRESS: 2843 if (len >= 6 && p[1] == 6) { 2844 /* correctly formed address option */ 2845 continue; 2846 } 2847 if (debug) 2848 addlog(" [invalid]"); 2849 break; 2850 default: 2851 /* Others not supported. */ 2852 if (debug) 2853 addlog(" [rej]"); 2854 break; 2855 } 2856 /* Add the option to rejected list. */ 2857 bcopy (p, r, p[1]); 2858 r += p[1]; 2859 rlen += p[1]; 2860 } 2861 if (rlen) { 2862 if (debug) 2863 addlog(" send conf-rej\n"); 2864 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2865 goto end; 2866 } else if (debug) 2867 addlog("\n"); 2868 2869 /* pass 2: parse option values */ 2870 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2871 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2872 else 2873 #ifdef INET 2874 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2875 #else 2876 hisaddr = 0; 2877 #endif 2878 if (debug) 2879 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2880 ifp->if_xname); 2881 p = (void *)(h + 1); 2882 len = origlen; 2883 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2884 if (debug) 2885 addlog(" %s", sppp_ipcp_opt_name(*p)); 2886 switch (*p) { 2887 #ifdef notyet 2888 case IPCP_OPT_COMPRESSION: 2889 continue; 2890 #endif 2891 case IPCP_OPT_ADDRESS: 2892 desiredaddr = p[2] << 24 | p[3] << 16 | 2893 p[4] << 8 | p[5]; 2894 if (desiredaddr == hisaddr || 2895 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2896 /* 2897 * Peer's address is same as our value, 2898 * this is agreeable. Gonna conf-ack 2899 * it. 2900 */ 2901 if (debug) 2902 addlog(" %s [ack]", 2903 sppp_dotted_quad(hisaddr)); 2904 /* record that we've seen it already */ 2905 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2906 sp->ipcp.req_hisaddr = desiredaddr; 2907 hisaddr = desiredaddr; 2908 continue; 2909 } 2910 /* 2911 * The address wasn't agreeable. This is either 2912 * he sent us 0.0.0.0, asking to assign him an 2913 * address, or he send us another address not 2914 * matching our value. Either case, we gonna 2915 * conf-nak it with our value. 2916 */ 2917 if (debug) { 2918 if (desiredaddr == 0) 2919 addlog(" [addr requested]"); 2920 else 2921 addlog(" %s [not agreed]", 2922 sppp_dotted_quad(desiredaddr)); 2923 } 2924 2925 p[2] = hisaddr >> 24; 2926 p[3] = hisaddr >> 16; 2927 p[4] = hisaddr >> 8; 2928 p[5] = hisaddr; 2929 break; 2930 } 2931 /* Add the option to nak'ed list. */ 2932 bcopy (p, r, p[1]); 2933 r += p[1]; 2934 rlen += p[1]; 2935 } 2936 2937 /* 2938 * If we are about to conf-ack the request, but haven't seen 2939 * his address so far, gonna conf-nak it instead, with the 2940 * `address' option present and our idea of his address being 2941 * filled in there, to request negotiation of both addresses. 2942 * 2943 * XXX This can result in an endless req - nak loop if peer 2944 * doesn't want to send us his address. Q: What should we do 2945 * about it? XXX A: implement the max-failure counter. 2946 */ 2947 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2948 buf[0] = IPCP_OPT_ADDRESS; 2949 buf[1] = 6; 2950 buf[2] = hisaddr >> 24; 2951 buf[3] = hisaddr >> 16; 2952 buf[4] = hisaddr >> 8; 2953 buf[5] = hisaddr; 2954 rlen = 6; 2955 if (debug) 2956 addlog(" still need hisaddr"); 2957 } 2958 2959 if (rlen) { 2960 if (debug) 2961 addlog(" send conf-nak\n"); 2962 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2963 } else { 2964 if (debug) 2965 addlog(" send conf-ack\n"); 2966 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 2967 } 2968 2969 end: 2970 free(buf, M_TEMP); 2971 return (rlen == 0); 2972 } 2973 2974 /* 2975 * Analyze the IPCP Configure-Reject option list, and adjust our 2976 * negotiation. 2977 */ 2978 static void 2979 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2980 { 2981 u_char *buf, *p; 2982 struct ifnet *ifp = &sp->pp_if; 2983 int debug = ifp->if_flags & IFF_DEBUG; 2984 2985 len -= 4; 2986 buf = malloc (len, M_TEMP, M_NOWAIT); 2987 if (!buf) 2988 return; 2989 2990 if (debug) 2991 log(LOG_DEBUG, "%s: ipcp rej opts:", 2992 ifp->if_xname); 2993 2994 p = (void *)(h + 1); 2995 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2996 if (debug) 2997 addlog(" %s", sppp_ipcp_opt_name(*p)); 2998 switch (*p) { 2999 case IPCP_OPT_ADDRESS: 3000 /* 3001 * Peer doesn't grok address option. This is 3002 * bad. XXX Should we better give up here? 3003 */ 3004 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3005 break; 3006 #ifdef notyet 3007 case IPCP_OPT_COMPRESS: 3008 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3009 break; 3010 #endif 3011 } 3012 } 3013 if (debug) 3014 addlog("\n"); 3015 free(buf, M_TEMP); 3016 return; 3017 } 3018 3019 /* 3020 * Analyze the IPCP Configure-NAK option list, and adjust our 3021 * negotiation. 3022 */ 3023 static void 3024 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3025 { 3026 u_char *p; 3027 struct ifnet *ifp = &sp->pp_if; 3028 int debug = ifp->if_flags & IFF_DEBUG; 3029 u_int32_t wantaddr; 3030 3031 len -= 4; 3032 3033 if (debug) 3034 log(LOG_DEBUG, "%s: ipcp nak opts:", 3035 ifp->if_xname); 3036 3037 p = (void *)(h + 1); 3038 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3039 if (debug) 3040 addlog(" %s", sppp_ipcp_opt_name(*p)); 3041 switch (*p) { 3042 case IPCP_OPT_ADDRESS: 3043 /* 3044 * Peer doesn't like our local IP address. See 3045 * if we can do something for him. We'll drop 3046 * him our address then. 3047 */ 3048 if (len >= 6 && p[1] == 6) { 3049 wantaddr = p[2] << 24 | p[3] << 16 | 3050 p[4] << 8 | p[5]; 3051 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3052 if (debug) 3053 addlog(" [wantaddr %s]", 3054 sppp_dotted_quad(wantaddr)); 3055 /* 3056 * When doing dynamic address assignment, 3057 * we accept his offer. Otherwise, we 3058 * ignore it and thus continue to negotiate 3059 * our already existing value. 3060 */ 3061 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3062 if (debug) 3063 addlog(" [agree]"); 3064 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3065 sp->ipcp.req_myaddr = wantaddr; 3066 } 3067 } 3068 break; 3069 3070 case IPCP_OPT_PRIMDNS: 3071 if (len >= 6 && p[1] == 6) { 3072 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3073 p[4] << 8 | p[5]; 3074 } 3075 break; 3076 3077 case IPCP_OPT_SECDNS: 3078 if (len >= 6 && p[1] == 6) { 3079 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3080 p[4] << 8 | p[5]; 3081 } 3082 break; 3083 #ifdef notyet 3084 case IPCP_OPT_COMPRESS: 3085 /* 3086 * Peer wants different compression parameters. 3087 */ 3088 break; 3089 #endif 3090 } 3091 } 3092 if (debug) 3093 addlog("\n"); 3094 return; 3095 } 3096 3097 static void 3098 sppp_ipcp_tlu(struct sppp *sp) 3099 { 3100 #ifdef INET 3101 /* we are up. Set addresses and notify anyone interested */ 3102 STDDCL; 3103 u_int32_t myaddr, hisaddr; 3104 3105 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3106 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3107 myaddr = sp->ipcp.req_myaddr; 3108 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3109 hisaddr = sp->ipcp.req_hisaddr; 3110 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3111 3112 if (ifp->if_mtu > sp->lcp.their_mru) { 3113 sp->pp_saved_mtu = ifp->if_mtu; 3114 ifp->if_mtu = sp->lcp.their_mru; 3115 if (debug) 3116 log(LOG_DEBUG, 3117 "%s: setting MTU to %" PRIu64 " bytes\n", 3118 ifp->if_xname, ifp->if_mtu); 3119 } 3120 3121 if (sp->pp_con) 3122 sp->pp_con(sp); 3123 #endif 3124 } 3125 3126 static void 3127 sppp_ipcp_tld(struct sppp *sp) 3128 { 3129 } 3130 3131 static void 3132 sppp_ipcp_tls(struct sppp *sp) 3133 { 3134 /* indicate to LCP that it must stay alive */ 3135 sp->lcp.protos |= (1 << IDX_IPCP); 3136 } 3137 3138 static void 3139 sppp_ipcp_tlf(struct sppp *sp) 3140 { 3141 /* we no longer need LCP */ 3142 sp->lcp.protos &= ~(1 << IDX_IPCP); 3143 } 3144 3145 static void 3146 sppp_ipcp_scr(struct sppp *sp) 3147 { 3148 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3149 #ifdef INET 3150 u_int32_t ouraddr; 3151 #endif 3152 int i = 0; 3153 3154 #ifdef notyet 3155 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3156 opt[i++] = IPCP_OPT_COMPRESSION; 3157 opt[i++] = 6; 3158 opt[i++] = 0; /* VJ header compression */ 3159 opt[i++] = 0x2d; /* VJ header compression */ 3160 opt[i++] = max_slot_id; 3161 opt[i++] = comp_slot_id; 3162 } 3163 #endif 3164 3165 #ifdef INET 3166 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3167 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3168 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3169 else 3170 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3171 opt[i++] = IPCP_OPT_ADDRESS; 3172 opt[i++] = 6; 3173 opt[i++] = ouraddr >> 24; 3174 opt[i++] = ouraddr >> 16; 3175 opt[i++] = ouraddr >> 8; 3176 opt[i++] = ouraddr; 3177 } 3178 #endif 3179 3180 if (sp->query_dns & 1) { 3181 opt[i++] = IPCP_OPT_PRIMDNS; 3182 opt[i++] = 6; 3183 opt[i++] = sp->dns_addrs[0] >> 24; 3184 opt[i++] = sp->dns_addrs[0] >> 16; 3185 opt[i++] = sp->dns_addrs[0] >> 8; 3186 opt[i++] = sp->dns_addrs[0]; 3187 } 3188 if (sp->query_dns & 2) { 3189 opt[i++] = IPCP_OPT_SECDNS; 3190 opt[i++] = 6; 3191 opt[i++] = sp->dns_addrs[1] >> 24; 3192 opt[i++] = sp->dns_addrs[1] >> 16; 3193 opt[i++] = sp->dns_addrs[1] >> 8; 3194 opt[i++] = sp->dns_addrs[1]; 3195 } 3196 3197 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3198 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3199 } 3200 3201 3202 /* 3203 *--------------------------------------------------------------------------* 3204 * * 3205 * The IPv6CP implementation. * 3206 * * 3207 *--------------------------------------------------------------------------* 3208 */ 3209 3210 #ifdef INET6 3211 static void 3212 sppp_ipv6cp_init(struct sppp *sp) 3213 { 3214 sp->ipv6cp.opts = 0; 3215 sp->ipv6cp.flags = 0; 3216 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3217 sp->fail_counter[IDX_IPV6CP] = 0; 3218 sp->pp_seq[IDX_IPV6CP] = 0; 3219 sp->pp_rseq[IDX_IPV6CP] = 0; 3220 callout_init(&sp->ch[IDX_IPV6CP]); 3221 } 3222 3223 static void 3224 sppp_ipv6cp_up(struct sppp *sp) 3225 { 3226 sppp_up_event(&ipv6cp, sp); 3227 } 3228 3229 static void 3230 sppp_ipv6cp_down(struct sppp *sp) 3231 { 3232 sppp_down_event(&ipv6cp, sp); 3233 } 3234 3235 static void 3236 sppp_ipv6cp_open(struct sppp *sp) 3237 { 3238 STDDCL; 3239 struct in6_addr myaddr, hisaddr; 3240 3241 #ifdef IPV6CP_MYIFID_DYN 3242 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3243 #else 3244 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3245 #endif 3246 3247 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3248 /* 3249 * If we don't have our address, this probably means our 3250 * interface doesn't want to talk IPv6 at all. (This could 3251 * be the case if somebody wants to speak only IPX, for 3252 * example.) Don't open IPv6CP in this case. 3253 */ 3254 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3255 /* XXX this message should go away */ 3256 if (debug) 3257 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3258 ifp->if_xname); 3259 return; 3260 } 3261 3262 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3263 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3264 sppp_open_event(&ipv6cp, sp); 3265 } 3266 3267 static void 3268 sppp_ipv6cp_close(struct sppp *sp) 3269 { 3270 sppp_close_event(&ipv6cp, sp); 3271 } 3272 3273 static void 3274 sppp_ipv6cp_TO(void *cookie) 3275 { 3276 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3277 } 3278 3279 /* 3280 * Analyze a configure request. Return true if it was agreeable, and 3281 * caused action sca, false if it has been rejected or nak'ed, and 3282 * caused action scn. (The return value is used to make the state 3283 * transition decision in the state automaton.) 3284 */ 3285 static int 3286 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3287 { 3288 u_char *buf, *r, *p; 3289 struct ifnet *ifp = &sp->pp_if; 3290 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3291 struct in6_addr myaddr, desiredaddr, suggestaddr; 3292 int ifidcount; 3293 int type; 3294 int collision, nohisaddr; 3295 3296 len -= 4; 3297 origlen = len; 3298 /* 3299 * Make sure to allocate a buf that can at least hold a 3300 * conf-nak with an `address' option. We might need it below. 3301 */ 3302 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3303 if (! buf) 3304 return (0); 3305 3306 /* pass 1: see if we can recognize them */ 3307 if (debug) 3308 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3309 ifp->if_xname); 3310 p = (void *)(h + 1); 3311 ifidcount = 0; 3312 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3313 if (debug) 3314 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3315 switch (*p) { 3316 case IPV6CP_OPT_IFID: 3317 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3318 /* correctly formed address option */ 3319 ifidcount++; 3320 continue; 3321 } 3322 if (debug) 3323 addlog(" [invalid]"); 3324 break; 3325 #ifdef notyet 3326 case IPV6CP_OPT_COMPRESSION: 3327 if (len >= 4 && p[1] >= 4) { 3328 /* correctly formed compress option */ 3329 continue; 3330 } 3331 if (debug) 3332 addlog(" [invalid]"); 3333 break; 3334 #endif 3335 default: 3336 /* Others not supported. */ 3337 if (debug) 3338 addlog(" [rej]"); 3339 break; 3340 } 3341 /* Add the option to rejected list. */ 3342 bcopy (p, r, p[1]); 3343 r += p[1]; 3344 rlen += p[1]; 3345 } 3346 if (rlen) { 3347 if (debug) 3348 addlog(" send conf-rej\n"); 3349 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3350 goto end; 3351 } else if (debug) 3352 addlog("\n"); 3353 3354 /* pass 2: parse option values */ 3355 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3356 if (debug) 3357 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3358 ifp->if_xname); 3359 p = (void *)(h + 1); 3360 len = origlen; 3361 type = CONF_ACK; 3362 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3363 if (debug) 3364 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3365 switch (*p) { 3366 #ifdef notyet 3367 case IPV6CP_OPT_COMPRESSION: 3368 continue; 3369 #endif 3370 case IPV6CP_OPT_IFID: 3371 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3372 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3373 collision = (memcmp(&desiredaddr.s6_addr[8], 3374 &myaddr.s6_addr[8], 8) == 0); 3375 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3376 3377 desiredaddr.s6_addr16[0] = htons(0xfe80); 3378 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3379 3380 if (!collision && !nohisaddr) { 3381 /* no collision, hisaddr known - Conf-Ack */ 3382 type = CONF_ACK; 3383 3384 if (debug) { 3385 addlog(" %s [%s]", 3386 ip6_sprintf(&desiredaddr), 3387 sppp_cp_type_name(type)); 3388 } 3389 continue; 3390 } 3391 3392 memset(&suggestaddr, 0, sizeof(&suggestaddr)); 3393 if (collision && nohisaddr) { 3394 /* collision, hisaddr unknown - Conf-Rej */ 3395 type = CONF_REJ; 3396 memset(&p[2], 0, 8); 3397 } else { 3398 /* 3399 * - no collision, hisaddr unknown, or 3400 * - collision, hisaddr known 3401 * Conf-Nak, suggest hisaddr 3402 */ 3403 type = CONF_NAK; 3404 sppp_suggest_ip6_addr(sp, &suggestaddr); 3405 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3406 } 3407 if (debug) 3408 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3409 sppp_cp_type_name(type)); 3410 break; 3411 } 3412 /* Add the option to nak'ed list. */ 3413 bcopy (p, r, p[1]); 3414 r += p[1]; 3415 rlen += p[1]; 3416 } 3417 3418 if (rlen == 0 && type == CONF_ACK) { 3419 if (debug) 3420 addlog(" send %s\n", sppp_cp_type_name(type)); 3421 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3422 } else { 3423 #ifdef notdef 3424 if (type == CONF_ACK) 3425 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3426 #endif 3427 3428 if (debug) { 3429 addlog(" send %s suggest %s\n", 3430 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3431 } 3432 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3433 } 3434 3435 end: 3436 free(buf, M_TEMP); 3437 return (rlen == 0); 3438 } 3439 3440 /* 3441 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3442 * negotiation. 3443 */ 3444 static void 3445 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3446 { 3447 u_char *buf, *p; 3448 struct ifnet *ifp = &sp->pp_if; 3449 int debug = ifp->if_flags & IFF_DEBUG; 3450 3451 len -= 4; 3452 buf = malloc (len, M_TEMP, M_NOWAIT); 3453 if (!buf) 3454 return; 3455 3456 if (debug) 3457 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3458 ifp->if_xname); 3459 3460 p = (void *)(h + 1); 3461 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3462 if (debug) 3463 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3464 switch (*p) { 3465 case IPV6CP_OPT_IFID: 3466 /* 3467 * Peer doesn't grok address option. This is 3468 * bad. XXX Should we better give up here? 3469 */ 3470 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3471 break; 3472 #ifdef notyet 3473 case IPV6CP_OPT_COMPRESS: 3474 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3475 break; 3476 #endif 3477 } 3478 } 3479 if (debug) 3480 addlog("\n"); 3481 free(buf, M_TEMP); 3482 return; 3483 } 3484 3485 /* 3486 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3487 * negotiation. 3488 */ 3489 static void 3490 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3491 { 3492 u_char *buf, *p; 3493 struct ifnet *ifp = &sp->pp_if; 3494 int debug = ifp->if_flags & IFF_DEBUG; 3495 struct in6_addr suggestaddr; 3496 3497 len -= 4; 3498 buf = malloc (len, M_TEMP, M_NOWAIT); 3499 if (!buf) 3500 return; 3501 3502 if (debug) 3503 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3504 ifp->if_xname); 3505 3506 p = (void *)(h + 1); 3507 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3508 if (debug) 3509 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3510 switch (*p) { 3511 case IPV6CP_OPT_IFID: 3512 /* 3513 * Peer doesn't like our local ifid. See 3514 * if we can do something for him. We'll drop 3515 * him our address then. 3516 */ 3517 if (len < 10 || p[1] != 10) 3518 break; 3519 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3520 suggestaddr.s6_addr16[0] = htons(0xfe80); 3521 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 3522 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3523 3524 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3525 if (debug) 3526 addlog(" [suggestaddr %s]", 3527 ip6_sprintf(&suggestaddr)); 3528 #ifdef IPV6CP_MYIFID_DYN 3529 /* 3530 * When doing dynamic address assignment, 3531 * we accept his offer. 3532 */ 3533 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3534 struct in6_addr lastsuggest; 3535 /* 3536 * If <suggested myaddr from peer> equals to 3537 * <hisaddr we have suggested last time>, 3538 * we have a collision. generate new random 3539 * ifid. 3540 */ 3541 sppp_suggest_ip6_addr(&lastsuggest); 3542 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3543 lastsuggest)) { 3544 if (debug) 3545 addlog(" [random]"); 3546 sppp_gen_ip6_addr(sp, &suggestaddr); 3547 } 3548 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3549 if (debug) 3550 addlog(" [agree]"); 3551 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3552 } 3553 #else 3554 /* 3555 * Since we do not do dynamic address assignment, 3556 * we ignore it and thus continue to negotiate 3557 * our already existing value. This can possibly 3558 * go into infinite request-reject loop. 3559 * 3560 * This is not likely because we normally use 3561 * ifid based on MAC-address. 3562 * If you have no ethernet card on the node, too bad. 3563 * XXX should we use fail_counter? 3564 */ 3565 #endif 3566 break; 3567 #ifdef notyet 3568 case IPV6CP_OPT_COMPRESS: 3569 /* 3570 * Peer wants different compression parameters. 3571 */ 3572 break; 3573 #endif 3574 } 3575 } 3576 if (debug) 3577 addlog("\n"); 3578 free(buf, M_TEMP); 3579 return; 3580 } 3581 3582 static void 3583 sppp_ipv6cp_tlu(struct sppp *sp) 3584 { 3585 /* we are up - notify isdn daemon */ 3586 if (sp->pp_con) 3587 sp->pp_con(sp); 3588 } 3589 3590 static void 3591 sppp_ipv6cp_tld(struct sppp *sp) 3592 { 3593 } 3594 3595 static void 3596 sppp_ipv6cp_tls(struct sppp *sp) 3597 { 3598 /* indicate to LCP that it must stay alive */ 3599 sp->lcp.protos |= (1 << IDX_IPV6CP); 3600 } 3601 3602 static void 3603 sppp_ipv6cp_tlf(struct sppp *sp) 3604 { 3605 /* we no longer need LCP */ 3606 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3607 } 3608 3609 static void 3610 sppp_ipv6cp_scr(struct sppp *sp) 3611 { 3612 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3613 struct in6_addr ouraddr; 3614 int i = 0; 3615 3616 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3617 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3618 opt[i++] = IPV6CP_OPT_IFID; 3619 opt[i++] = 10; 3620 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3621 i += 8; 3622 } 3623 3624 #ifdef notyet 3625 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3626 opt[i++] = IPV6CP_OPT_COMPRESSION; 3627 opt[i++] = 4; 3628 opt[i++] = 0; /* TBD */ 3629 opt[i++] = 0; /* TBD */ 3630 /* variable length data may follow */ 3631 } 3632 #endif 3633 3634 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3635 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3636 } 3637 #else /*INET6*/ 3638 static void sppp_ipv6cp_init(struct sppp *sp) 3639 { 3640 } 3641 3642 static void sppp_ipv6cp_up(struct sppp *sp) 3643 { 3644 } 3645 3646 static void sppp_ipv6cp_down(struct sppp *sp) 3647 { 3648 } 3649 3650 3651 static void sppp_ipv6cp_open(struct sppp *sp) 3652 { 3653 } 3654 3655 static void sppp_ipv6cp_close(struct sppp *sp) 3656 { 3657 } 3658 3659 static void sppp_ipv6cp_TO(void *sp) 3660 { 3661 } 3662 3663 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3664 { 3665 return 0; 3666 } 3667 3668 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3669 { 3670 } 3671 3672 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3673 { 3674 } 3675 3676 static void sppp_ipv6cp_tlu(struct sppp *sp) 3677 { 3678 } 3679 3680 static void sppp_ipv6cp_tld(struct sppp *sp) 3681 { 3682 } 3683 3684 static void sppp_ipv6cp_tls(struct sppp *sp) 3685 { 3686 } 3687 3688 static void sppp_ipv6cp_tlf(struct sppp *sp) 3689 { 3690 } 3691 3692 static void sppp_ipv6cp_scr(struct sppp *sp) 3693 { 3694 } 3695 #endif /*INET6*/ 3696 3697 3698 /* 3699 *--------------------------------------------------------------------------* 3700 * * 3701 * The CHAP implementation. * 3702 * * 3703 *--------------------------------------------------------------------------* 3704 */ 3705 3706 /* 3707 * The authentication protocols don't employ a full-fledged state machine as 3708 * the control protocols do, since they do have Open and Close events, but 3709 * not Up and Down, nor are they explicitly terminated. Also, use of the 3710 * authentication protocols may be different in both directions (this makes 3711 * sense, think of a machine that never accepts incoming calls but only 3712 * calls out, it doesn't require the called party to authenticate itself). 3713 * 3714 * Our state machine for the local authentication protocol (we are requesting 3715 * the peer to authenticate) looks like: 3716 * 3717 * RCA- 3718 * +--------------------------------------------+ 3719 * V scn,tld| 3720 * +--------+ Close +---------+ RCA+ 3721 * | |<----------------------------------| |------+ 3722 * +--->| Closed | TO* | Opened | sca | 3723 * | | |-----+ +-------| |<-----+ 3724 * | +--------+ irc | | +---------+ 3725 * | ^ | | ^ 3726 * | | | | | 3727 * | | | | | 3728 * | TO-| | | | 3729 * | |tld TO+ V | | 3730 * | | +------->+ | | 3731 * | | | | | | 3732 * | +--------+ V | | 3733 * | | |<----+<--------------------+ | 3734 * | | Req- | scr | 3735 * | | Sent | | 3736 * | | | | 3737 * | +--------+ | 3738 * | RCA- | | RCA+ | 3739 * +------+ +------------------------------------------+ 3740 * scn,tld sca,irc,ict,tlu 3741 * 3742 * 3743 * with: 3744 * 3745 * Open: LCP reached authentication phase 3746 * Close: LCP reached terminate phase 3747 * 3748 * RCA+: received reply (pap-req, chap-response), acceptable 3749 * RCN: received reply (pap-req, chap-response), not acceptable 3750 * TO+: timeout with restart counter >= 0 3751 * TO-: timeout with restart counter < 0 3752 * TO*: reschedule timeout for CHAP 3753 * 3754 * scr: send request packet (none for PAP, chap-challenge) 3755 * sca: send ack packet (pap-ack, chap-success) 3756 * scn: send nak packet (pap-nak, chap-failure) 3757 * ict: initialize re-challenge timer (CHAP only) 3758 * 3759 * tlu: this-layer-up, LCP reaches network phase 3760 * tld: this-layer-down, LCP enters terminate phase 3761 * 3762 * Note that in CHAP mode, after sending a new challenge, while the state 3763 * automaton falls back into Req-Sent state, it doesn't signal a tld 3764 * event to LCP, so LCP remains in network phase. Only after not getting 3765 * any response (or after getting an unacceptable response), CHAP closes, 3766 * causing LCP to enter terminate phase. 3767 * 3768 * With PAP, there is no initial request that can be sent. The peer is 3769 * expected to send one based on the successful negotiation of PAP as 3770 * the authentication protocol during the LCP option negotiation. 3771 * 3772 * Incoming authentication protocol requests (remote requests 3773 * authentication, we are peer) don't employ a state machine at all, 3774 * they are simply answered. Some peers [Ascend P50 firmware rev 3775 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3776 * still in authentication phase (thereby violating the standard that 3777 * demands that these NCP packets are to be discarded), so we keep 3778 * track of the peer demanding us to authenticate, and only proceed to 3779 * phase network once we've seen a positive acknowledge for the 3780 * authentication. 3781 */ 3782 3783 /* 3784 * Handle incoming CHAP packets. 3785 */ 3786 void 3787 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3788 { 3789 STDDCL; 3790 struct lcp_header *h; 3791 int len, x; 3792 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3793 int value_len, name_len; 3794 MD5_CTX ctx; 3795 3796 len = m->m_pkthdr.len; 3797 if (len < 4) { 3798 if (debug) 3799 log(LOG_DEBUG, 3800 "%s: chap invalid packet length: %d bytes\n", 3801 ifp->if_xname, len); 3802 return; 3803 } 3804 h = mtod(m, struct lcp_header *); 3805 if (len > ntohs(h->len)) 3806 len = ntohs(h->len); 3807 3808 switch (h->type) { 3809 /* challenge, failure and success are his authproto */ 3810 case CHAP_CHALLENGE: 3811 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3812 /* can't do anything usefull */ 3813 sp->pp_auth_failures++; 3814 printf("%s: chap input without my name and my secret being set\n", 3815 ifp->if_xname); 3816 break; 3817 } 3818 value = 1 + (u_char *)(h + 1); 3819 value_len = value[-1]; 3820 name = value + value_len; 3821 name_len = len - value_len - 5; 3822 if (name_len < 0) { 3823 if (debug) { 3824 log(LOG_DEBUG, 3825 "%s: chap corrupted challenge " 3826 "<%s id=0x%x len=%d", 3827 ifp->if_xname, 3828 sppp_auth_type_name(PPP_CHAP, h->type), 3829 h->ident, ntohs(h->len)); 3830 if (len > 4) 3831 sppp_print_bytes((u_char *)(h + 1), 3832 len - 4); 3833 addlog(">\n"); 3834 } 3835 break; 3836 } 3837 3838 if (debug) { 3839 log(LOG_DEBUG, 3840 "%s: chap input <%s id=0x%x len=%d name=", 3841 ifp->if_xname, 3842 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3843 ntohs(h->len)); 3844 sppp_print_string((char *) name, name_len); 3845 addlog(" value-size=%d value=", value_len); 3846 sppp_print_bytes(value, value_len); 3847 addlog(">\n"); 3848 } 3849 3850 /* Compute reply value. */ 3851 MD5Init(&ctx); 3852 MD5Update(&ctx, &h->ident, 1); 3853 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3854 MD5Update(&ctx, value, value_len); 3855 MD5Final(digest, &ctx); 3856 dsize = sizeof digest; 3857 3858 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3859 sizeof dsize, (const char *)&dsize, 3860 sizeof digest, digest, 3861 sp->myauth.name_len, 3862 sp->myauth.name, 3863 0); 3864 break; 3865 3866 case CHAP_SUCCESS: 3867 if (debug) { 3868 log(LOG_DEBUG, "%s: chap success", 3869 ifp->if_xname); 3870 if (len > 4) { 3871 addlog(": "); 3872 sppp_print_string((char *)(h + 1), len - 4); 3873 } 3874 addlog("\n"); 3875 } 3876 x = splnet(); 3877 sp->pp_auth_failures = 0; 3878 sp->pp_flags &= ~PP_NEEDAUTH; 3879 if (sp->myauth.proto == PPP_CHAP && 3880 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3881 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3882 /* 3883 * We are authenticator for CHAP but didn't 3884 * complete yet. Leave it to tlu to proceed 3885 * to network phase. 3886 */ 3887 splx(x); 3888 break; 3889 } 3890 splx(x); 3891 sppp_phase_network(sp); 3892 break; 3893 3894 case CHAP_FAILURE: 3895 x = splnet(); 3896 sp->pp_auth_failures++; 3897 splx(x); 3898 if (debug) { 3899 log(LOG_INFO, "%s: chap failure", 3900 ifp->if_xname); 3901 if (len > 4) { 3902 addlog(": "); 3903 sppp_print_string((char *)(h + 1), len - 4); 3904 } 3905 addlog("\n"); 3906 } else 3907 log(LOG_INFO, "%s: chap failure\n", 3908 ifp->if_xname); 3909 /* await LCP shutdown by authenticator */ 3910 break; 3911 3912 /* response is my authproto */ 3913 case CHAP_RESPONSE: 3914 if (sp->hisauth.secret == NULL) { 3915 /* can't do anything usefull */ 3916 printf("%s: chap input without his secret being set\n", 3917 ifp->if_xname); 3918 break; 3919 } 3920 value = 1 + (u_char *)(h + 1); 3921 value_len = value[-1]; 3922 name = value + value_len; 3923 name_len = len - value_len - 5; 3924 if (name_len < 0) { 3925 if (debug) { 3926 log(LOG_DEBUG, 3927 "%s: chap corrupted response " 3928 "<%s id=0x%x len=%d", 3929 ifp->if_xname, 3930 sppp_auth_type_name(PPP_CHAP, h->type), 3931 h->ident, ntohs(h->len)); 3932 if (len > 4) 3933 sppp_print_bytes((u_char *)(h + 1), 3934 len - 4); 3935 addlog(">\n"); 3936 } 3937 break; 3938 } 3939 if (h->ident != sp->confid[IDX_CHAP]) { 3940 if (debug) 3941 log(LOG_DEBUG, 3942 "%s: chap dropping response for old ID " 3943 "(got %d, expected %d)\n", 3944 ifp->if_xname, 3945 h->ident, sp->confid[IDX_CHAP]); 3946 break; 3947 } 3948 if (sp->hisauth.name != NULL && 3949 (name_len != sp->hisauth.name_len 3950 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 3951 log(LOG_INFO, "%s: chap response, his name ", 3952 ifp->if_xname); 3953 sppp_print_string(name, name_len); 3954 addlog(" != expected "); 3955 sppp_print_string(sp->hisauth.name, 3956 sp->hisauth.name_len); 3957 addlog("\n"); 3958 goto chap_failure; 3959 } 3960 if (debug) { 3961 log(LOG_DEBUG, "%s: chap input(%s) " 3962 "<%s id=0x%x len=%d name=", 3963 ifp->if_xname, 3964 sppp_state_name(sp->state[IDX_CHAP]), 3965 sppp_auth_type_name(PPP_CHAP, h->type), 3966 h->ident, ntohs(h->len)); 3967 sppp_print_string((char *)name, name_len); 3968 addlog(" value-size=%d value=", value_len); 3969 sppp_print_bytes(value, value_len); 3970 addlog(">\n"); 3971 } 3972 if (value_len != sizeof(sp->myauth.challenge)) { 3973 if (debug) 3974 log(LOG_DEBUG, 3975 "%s: chap bad hash value length: " 3976 "%d bytes, should be %ld\n", 3977 ifp->if_xname, value_len, 3978 (long) sizeof(sp->myauth.challenge)); 3979 goto chap_failure; 3980 } 3981 3982 MD5Init(&ctx); 3983 MD5Update(&ctx, &h->ident, 1); 3984 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 3985 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 3986 MD5Final(digest, &ctx); 3987 3988 #define FAILMSG "Failed..." 3989 #define SUCCMSG "Welcome!" 3990 3991 if (value_len != sizeof digest || 3992 memcmp(digest, value, value_len) != 0) { 3993 chap_failure: 3994 /* action scn, tld */ 3995 x = splnet(); 3996 sp->pp_auth_failures++; 3997 splx(x); 3998 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 3999 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4000 0); 4001 chap.tld(sp); 4002 break; 4003 } 4004 sp->pp_auth_failures = 0; 4005 /* action sca, perhaps tlu */ 4006 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4007 sp->state[IDX_CHAP] == STATE_OPENED) 4008 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4009 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4010 0); 4011 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4012 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4013 chap.tlu(sp); 4014 } 4015 break; 4016 4017 default: 4018 /* Unknown CHAP packet type -- ignore. */ 4019 if (debug) { 4020 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4021 "<0x%x id=0x%xh len=%d", 4022 ifp->if_xname, 4023 sppp_state_name(sp->state[IDX_CHAP]), 4024 h->type, h->ident, ntohs(h->len)); 4025 if (len > 4) 4026 sppp_print_bytes((u_char *)(h + 1), len - 4); 4027 addlog(">\n"); 4028 } 4029 break; 4030 4031 } 4032 } 4033 4034 static void 4035 sppp_chap_init(struct sppp *sp) 4036 { 4037 /* Chap doesn't have STATE_INITIAL at all. */ 4038 sp->state[IDX_CHAP] = STATE_CLOSED; 4039 sp->fail_counter[IDX_CHAP] = 0; 4040 sp->pp_seq[IDX_CHAP] = 0; 4041 sp->pp_rseq[IDX_CHAP] = 0; 4042 callout_init(&sp->ch[IDX_CHAP]); 4043 } 4044 4045 static void 4046 sppp_chap_open(struct sppp *sp) 4047 { 4048 if (sp->myauth.proto == PPP_CHAP && 4049 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4050 /* we are authenticator for CHAP, start it */ 4051 chap.scr(sp); 4052 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4053 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4054 } 4055 /* nothing to be done if we are peer, await a challenge */ 4056 } 4057 4058 static void 4059 sppp_chap_close(struct sppp *sp) 4060 { 4061 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4062 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4063 } 4064 4065 static void 4066 sppp_chap_TO(void *cookie) 4067 { 4068 struct sppp *sp = (struct sppp *)cookie; 4069 STDDCL; 4070 int s; 4071 4072 s = splnet(); 4073 if (debug) 4074 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4075 ifp->if_xname, 4076 sppp_state_name(sp->state[IDX_CHAP]), 4077 sp->rst_counter[IDX_CHAP]); 4078 4079 if (--sp->rst_counter[IDX_CHAP] < 0) 4080 /* TO- event */ 4081 switch (sp->state[IDX_CHAP]) { 4082 case STATE_REQ_SENT: 4083 chap.tld(sp); 4084 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4085 break; 4086 } 4087 else 4088 /* TO+ (or TO*) event */ 4089 switch (sp->state[IDX_CHAP]) { 4090 case STATE_OPENED: 4091 /* TO* event */ 4092 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4093 /* fall through */ 4094 case STATE_REQ_SENT: 4095 chap.scr(sp); 4096 /* sppp_cp_change_state() will restart the timer */ 4097 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4098 break; 4099 } 4100 4101 splx(s); 4102 } 4103 4104 static void 4105 sppp_chap_tlu(struct sppp *sp) 4106 { 4107 STDDCL; 4108 int i, x; 4109 4110 i = 0; 4111 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4112 4113 /* 4114 * Some broken CHAP implementations (Conware CoNet, firmware 4115 * 4.0.?) don't want to re-authenticate their CHAP once the 4116 * initial challenge-response exchange has taken place. 4117 * Provide for an option to avoid rechallenges. 4118 */ 4119 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4120 /* 4121 * Compute the re-challenge timeout. This will yield 4122 * a number between 300 and 810 seconds. 4123 */ 4124 i = 300 + ((unsigned)(arc4random() & 0xff00) >> 7); 4125 4126 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4127 } 4128 4129 if (debug) { 4130 log(LOG_DEBUG, 4131 "%s: chap %s, ", 4132 ifp->if_xname, 4133 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4134 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4135 addlog("next re-challenge in %d seconds\n", i); 4136 else 4137 addlog("re-challenging supressed\n"); 4138 } 4139 4140 x = splnet(); 4141 sp->pp_auth_failures = 0; 4142 /* indicate to LCP that we need to be closed down */ 4143 sp->lcp.protos |= (1 << IDX_CHAP); 4144 4145 if (sp->pp_flags & PP_NEEDAUTH) { 4146 /* 4147 * Remote is authenticator, but his auth proto didn't 4148 * complete yet. Defer the transition to network 4149 * phase. 4150 */ 4151 splx(x); 4152 return; 4153 } 4154 splx(x); 4155 4156 /* 4157 * If we are already in phase network, we are done here. This 4158 * is the case if this is a dummy tlu event after a re-challenge. 4159 */ 4160 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4161 sppp_phase_network(sp); 4162 } 4163 4164 static void 4165 sppp_chap_tld(struct sppp *sp) 4166 { 4167 STDDCL; 4168 4169 if (debug) 4170 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4171 callout_stop(&sp->ch[IDX_CHAP]); 4172 sp->lcp.protos &= ~(1 << IDX_CHAP); 4173 4174 lcp.Close(sp); 4175 } 4176 4177 static void 4178 sppp_chap_scr(struct sppp *sp) 4179 { 4180 u_int32_t *ch; 4181 u_char clen; 4182 4183 if (sp->myauth.name == NULL) { 4184 /* can't do anything usefull */ 4185 printf("%s: chap starting without my name being set\n", 4186 sp->pp_if.if_xname); 4187 return; 4188 } 4189 4190 /* Compute random challenge. */ 4191 ch = (u_int32_t *)sp->myauth.challenge; 4192 ch[0] = arc4random(); 4193 ch[1] = arc4random(); 4194 ch[2] = arc4random(); 4195 ch[3] = arc4random(); 4196 clen = 16; /* 4 * sizeof(u_int32_t) */ 4197 4198 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4199 4200 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4201 sizeof clen, (const char *)&clen, 4202 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4203 sp->myauth.name_len, 4204 sp->myauth.name, 4205 0); 4206 } 4207 4208 /* 4209 *--------------------------------------------------------------------------* 4210 * * 4211 * The PAP implementation. * 4212 * * 4213 *--------------------------------------------------------------------------* 4214 */ 4215 /* 4216 * For PAP, we need to keep a little state also if we are the peer, not the 4217 * authenticator. This is since we don't get a request to authenticate, but 4218 * have to repeatedly authenticate ourself until we got a response (or the 4219 * retry counter is expired). 4220 */ 4221 4222 /* 4223 * Handle incoming PAP packets. */ 4224 static void 4225 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4226 { 4227 STDDCL; 4228 struct lcp_header *h; 4229 int len, x; 4230 u_char mlen; 4231 char *name, *secret; 4232 int name_len, secret_len; 4233 4234 len = m->m_pkthdr.len; 4235 if (len < 5) { 4236 if (debug) 4237 log(LOG_DEBUG, 4238 "%s: pap invalid packet length: %d bytes\n", 4239 ifp->if_xname, len); 4240 return; 4241 } 4242 h = mtod(m, struct lcp_header *); 4243 if (len > ntohs(h->len)) 4244 len = ntohs(h->len); 4245 switch (h->type) { 4246 /* PAP request is my authproto */ 4247 case PAP_REQ: 4248 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4249 /* can't do anything usefull */ 4250 printf("%s: pap request without his name and his secret being set\n", 4251 ifp->if_xname); 4252 break; 4253 } 4254 name = 1 + (u_char *)(h + 1); 4255 name_len = name[-1]; 4256 secret = name + name_len + 1; 4257 if (name_len > len - 6 || 4258 (secret_len = secret[-1]) > len - 6 - name_len) { 4259 if (debug) { 4260 log(LOG_DEBUG, "%s: pap corrupted input " 4261 "<%s id=0x%x len=%d", 4262 ifp->if_xname, 4263 sppp_auth_type_name(PPP_PAP, h->type), 4264 h->ident, ntohs(h->len)); 4265 if (len > 4) 4266 sppp_print_bytes((u_char *)(h + 1), 4267 len - 4); 4268 addlog(">\n"); 4269 } 4270 break; 4271 } 4272 if (debug) { 4273 log(LOG_DEBUG, "%s: pap input(%s) " 4274 "<%s id=0x%x len=%d name=", 4275 ifp->if_xname, 4276 sppp_state_name(sp->state[IDX_PAP]), 4277 sppp_auth_type_name(PPP_PAP, h->type), 4278 h->ident, ntohs(h->len)); 4279 sppp_print_string((char *)name, name_len); 4280 addlog(" secret="); 4281 sppp_print_string((char *)secret, secret_len); 4282 addlog(">\n"); 4283 } 4284 if (name_len != sp->hisauth.name_len || 4285 secret_len != sp->hisauth.secret_len || 4286 memcmp(name, sp->hisauth.name, name_len) != 0 || 4287 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4288 /* action scn, tld */ 4289 sp->pp_auth_failures++; 4290 mlen = sizeof(FAILMSG) - 1; 4291 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4292 sizeof mlen, (const char *)&mlen, 4293 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4294 0); 4295 pap.tld(sp); 4296 break; 4297 } 4298 /* action sca, perhaps tlu */ 4299 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4300 sp->state[IDX_PAP] == STATE_OPENED) { 4301 mlen = sizeof(SUCCMSG) - 1; 4302 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4303 sizeof mlen, (const char *)&mlen, 4304 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4305 0); 4306 } 4307 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4308 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4309 pap.tlu(sp); 4310 } 4311 break; 4312 4313 /* ack and nak are his authproto */ 4314 case PAP_ACK: 4315 callout_stop(&sp->pap_my_to_ch); 4316 if (debug) { 4317 log(LOG_DEBUG, "%s: pap success", 4318 ifp->if_xname); 4319 name_len = *(char *)h; 4320 if (len > 5 && name_len) { 4321 addlog(": "); 4322 sppp_print_string((char *)(h + 1), name_len); 4323 } 4324 addlog("\n"); 4325 } 4326 x = splnet(); 4327 sp->pp_auth_failures = 0; 4328 sp->pp_flags &= ~PP_NEEDAUTH; 4329 if (sp->myauth.proto == PPP_PAP && 4330 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4331 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4332 /* 4333 * We are authenticator for PAP but didn't 4334 * complete yet. Leave it to tlu to proceed 4335 * to network phase. 4336 */ 4337 splx(x); 4338 break; 4339 } 4340 splx(x); 4341 sppp_phase_network(sp); 4342 break; 4343 4344 case PAP_NAK: 4345 callout_stop(&sp->pap_my_to_ch); 4346 sp->pp_auth_failures++; 4347 if (debug) { 4348 log(LOG_INFO, "%s: pap failure", 4349 ifp->if_xname); 4350 name_len = *(char *)h; 4351 if (len > 5 && name_len) { 4352 addlog(": "); 4353 sppp_print_string((char *)(h + 1), name_len); 4354 } 4355 addlog("\n"); 4356 } else 4357 log(LOG_INFO, "%s: pap failure\n", 4358 ifp->if_xname); 4359 /* await LCP shutdown by authenticator */ 4360 break; 4361 4362 default: 4363 /* Unknown PAP packet type -- ignore. */ 4364 if (debug) { 4365 log(LOG_DEBUG, "%s: pap corrupted input " 4366 "<0x%x id=0x%x len=%d", 4367 ifp->if_xname, 4368 h->type, h->ident, ntohs(h->len)); 4369 if (len > 4) 4370 sppp_print_bytes((u_char *)(h + 1), len - 4); 4371 addlog(">\n"); 4372 } 4373 break; 4374 4375 } 4376 } 4377 4378 static void 4379 sppp_pap_init(struct sppp *sp) 4380 { 4381 /* PAP doesn't have STATE_INITIAL at all. */ 4382 sp->state[IDX_PAP] = STATE_CLOSED; 4383 sp->fail_counter[IDX_PAP] = 0; 4384 sp->pp_seq[IDX_PAP] = 0; 4385 sp->pp_rseq[IDX_PAP] = 0; 4386 callout_init(&sp->ch[IDX_PAP]); 4387 callout_init(&sp->pap_my_to_ch); 4388 } 4389 4390 static void 4391 sppp_pap_open(struct sppp *sp) 4392 { 4393 if (sp->hisauth.proto == PPP_PAP && 4394 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4395 /* we are authenticator for PAP, start our timer */ 4396 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4397 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4398 } 4399 if (sp->myauth.proto == PPP_PAP) { 4400 /* we are peer, send a request, and start a timer */ 4401 pap.scr(sp); 4402 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4403 sppp_pap_my_TO, sp); 4404 } 4405 } 4406 4407 static void 4408 sppp_pap_close(struct sppp *sp) 4409 { 4410 if (sp->state[IDX_PAP] != STATE_CLOSED) 4411 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4412 } 4413 4414 /* 4415 * That's the timeout routine if we are authenticator. Since the 4416 * authenticator is basically passive in PAP, we can't do much here. 4417 */ 4418 static void 4419 sppp_pap_TO(void *cookie) 4420 { 4421 struct sppp *sp = (struct sppp *)cookie; 4422 STDDCL; 4423 int s; 4424 4425 s = splnet(); 4426 if (debug) 4427 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4428 ifp->if_xname, 4429 sppp_state_name(sp->state[IDX_PAP]), 4430 sp->rst_counter[IDX_PAP]); 4431 4432 if (--sp->rst_counter[IDX_PAP] < 0) 4433 /* TO- event */ 4434 switch (sp->state[IDX_PAP]) { 4435 case STATE_REQ_SENT: 4436 pap.tld(sp); 4437 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4438 break; 4439 } 4440 else 4441 /* TO+ event, not very much we could do */ 4442 switch (sp->state[IDX_PAP]) { 4443 case STATE_REQ_SENT: 4444 /* sppp_cp_change_state() will restart the timer */ 4445 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4446 break; 4447 } 4448 4449 splx(s); 4450 } 4451 4452 /* 4453 * That's the timeout handler if we are peer. Since the peer is active, 4454 * we need to retransmit our PAP request since it is apparently lost. 4455 * XXX We should impose a max counter. 4456 */ 4457 static void 4458 sppp_pap_my_TO(void *cookie) 4459 { 4460 struct sppp *sp = (struct sppp *)cookie; 4461 STDDCL; 4462 4463 if (debug) 4464 log(LOG_DEBUG, "%s: pap peer TO\n", 4465 ifp->if_xname); 4466 4467 pap.scr(sp); 4468 } 4469 4470 static void 4471 sppp_pap_tlu(struct sppp *sp) 4472 { 4473 STDDCL; 4474 int x; 4475 4476 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4477 4478 if (debug) 4479 log(LOG_DEBUG, "%s: %s tlu\n", 4480 ifp->if_xname, pap.name); 4481 4482 x = splnet(); 4483 sp->pp_auth_failures = 0; 4484 /* indicate to LCP that we need to be closed down */ 4485 sp->lcp.protos |= (1 << IDX_PAP); 4486 4487 if (sp->pp_flags & PP_NEEDAUTH) { 4488 /* 4489 * Remote is authenticator, but his auth proto didn't 4490 * complete yet. Defer the transition to network 4491 * phase. 4492 */ 4493 splx(x); 4494 return; 4495 } 4496 splx(x); 4497 sppp_phase_network(sp); 4498 } 4499 4500 static void 4501 sppp_pap_tld(struct sppp *sp) 4502 { 4503 STDDCL; 4504 4505 if (debug) 4506 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4507 callout_stop(&sp->ch[IDX_PAP]); 4508 callout_stop(&sp->pap_my_to_ch); 4509 sp->lcp.protos &= ~(1 << IDX_PAP); 4510 4511 lcp.Close(sp); 4512 } 4513 4514 static void 4515 sppp_pap_scr(struct sppp *sp) 4516 { 4517 u_char idlen, pwdlen; 4518 4519 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4520 /* can't do anything usefull */ 4521 printf("%s: pap starting without my name and secret being set\n", 4522 sp->pp_if.if_xname); 4523 return; 4524 } 4525 4526 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4527 pwdlen = sp->myauth.secret_len; 4528 idlen = sp->myauth.name_len; 4529 4530 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4531 sizeof idlen, (const char *)&idlen, 4532 idlen, sp->myauth.name, 4533 sizeof pwdlen, (const char *)&pwdlen, 4534 pwdlen, sp->myauth.secret, 4535 0); 4536 } 4537 4538 /* 4539 * Random miscellaneous functions. 4540 */ 4541 4542 /* 4543 * Send a PAP or CHAP proto packet. 4544 * 4545 * Varadic function, each of the elements for the ellipsis is of type 4546 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4547 * mlen == 0. 4548 * NOTE: never declare variadic functions with types subject to type 4549 * promotion (i.e. u_char). This is asking for big trouble depending 4550 * on the architecture you are on... 4551 */ 4552 4553 static void 4554 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4555 unsigned int type, unsigned int id, 4556 ...) 4557 { 4558 STDDCL; 4559 struct lcp_header *lh; 4560 struct mbuf *m; 4561 u_char *p; 4562 int len; 4563 size_t pkthdrlen; 4564 unsigned int mlen; 4565 const char *msg; 4566 va_list ap; 4567 4568 MGETHDR(m, M_DONTWAIT, MT_DATA); 4569 if (! m) 4570 return; 4571 m->m_pkthdr.rcvif = 0; 4572 4573 if (sp->pp_flags & PP_NOFRAMING) { 4574 *mtod(m, u_int16_t *) = htons(cp->proto); 4575 pkthdrlen = 2; 4576 lh = (struct lcp_header *)(mtod(m, u_int8_t *)+2); 4577 } else { 4578 struct ppp_header *h; 4579 h = mtod(m, struct ppp_header *); 4580 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4581 h->control = PPP_UI; /* Unnumbered Info */ 4582 h->protocol = htons(cp->proto); 4583 pkthdrlen = PPP_HEADER_LEN; 4584 4585 lh = (struct lcp_header *)(h + 1); 4586 } 4587 4588 lh->type = type; 4589 lh->ident = id; 4590 p = (u_char *)(lh + 1); 4591 4592 va_start(ap, id); 4593 len = 0; 4594 4595 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4596 msg = va_arg(ap, const char *); 4597 len += mlen; 4598 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4599 va_end(ap); 4600 m_freem(m); 4601 return; 4602 } 4603 4604 bcopy(msg, p, mlen); 4605 p += mlen; 4606 } 4607 va_end(ap); 4608 4609 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4610 lh->len = htons(LCP_HEADER_LEN + len); 4611 4612 if (debug) { 4613 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4614 ifp->if_xname, cp->name, 4615 sppp_auth_type_name(cp->proto, lh->type), 4616 lh->ident, ntohs(lh->len)); 4617 if (len) 4618 sppp_print_bytes((u_char *)(lh + 1), len); 4619 addlog(">\n"); 4620 } 4621 if (IF_QFULL(&sp->pp_cpq)) { 4622 IF_DROP(&sp->pp_fastq); 4623 IF_DROP(&ifp->if_snd); 4624 m_freem(m); 4625 ++ifp->if_oerrors; 4626 return; 4627 } else 4628 IF_ENQUEUE(&sp->pp_cpq, m); 4629 if (! (ifp->if_flags & IFF_OACTIVE)) 4630 (*ifp->if_start)(ifp); 4631 ifp->if_obytes += m->m_pkthdr.len + 3; 4632 } 4633 4634 /* 4635 * Send keepalive packets, every 10 seconds. 4636 */ 4637 static void 4638 sppp_keepalive(void *dummy) 4639 { 4640 struct sppp *sp; 4641 int s; 4642 time_t now; 4643 4644 s = splnet(); 4645 now = time_uptime; 4646 for (sp=spppq; sp; sp=sp->pp_next) { 4647 struct ifnet *ifp = &sp->pp_if; 4648 4649 /* check idle timeout */ 4650 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4651 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4652 /* idle timeout is enabled for this interface */ 4653 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4654 if (ifp->if_flags & IFF_DEBUG) 4655 printf("%s: no activity for %lu seconds\n", 4656 sp->pp_if.if_xname, 4657 (unsigned long)(now-sp->pp_last_activity)); 4658 lcp.Close(sp); 4659 continue; 4660 } 4661 } 4662 4663 /* Keepalive mode disabled or channel down? */ 4664 if (! (sp->pp_flags & PP_KEEPALIVE) || 4665 ! (ifp->if_flags & IFF_RUNNING)) 4666 continue; 4667 4668 /* No keepalive in PPP mode if LCP not opened yet. */ 4669 if (! (sp->pp_flags & PP_CISCO) && 4670 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4671 continue; 4672 4673 /* No echo reply, but maybe user data passed through? */ 4674 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4675 sp->pp_alivecnt = 0; 4676 continue; 4677 } 4678 4679 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4680 /* No keepalive packets got. Stop the interface. */ 4681 if_down (ifp); 4682 IF_PURGE(&sp->pp_cpq); 4683 if (! (sp->pp_flags & PP_CISCO)) { 4684 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4685 ifp->if_xname); 4686 sp->pp_alivecnt = 0; 4687 4688 /* we are down, close all open protocols */ 4689 lcp.Close(sp); 4690 4691 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4692 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4693 4694 /* Close connection imediatly, completition of this 4695 * will summon the magic needed to reestablish it. */ 4696 sp->pp_tlf(sp); 4697 continue; 4698 } 4699 } 4700 if (sp->pp_alivecnt < sp->pp_maxalive) 4701 ++sp->pp_alivecnt; 4702 if (sp->pp_flags & PP_CISCO) 4703 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4704 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4705 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4706 int32_t nmagic = htonl(sp->lcp.magic); 4707 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4708 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4709 sp->lcp.echoid, 4, &nmagic); 4710 } 4711 } 4712 splx(s); 4713 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4714 } 4715 4716 #ifdef INET 4717 /* 4718 * Get both IP addresses. 4719 */ 4720 static void 4721 sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, u_int32_t *srcmask) 4722 { 4723 struct ifnet *ifp = &sp->pp_if; 4724 struct ifaddr *ifa; 4725 struct sockaddr_in *si, *sm; 4726 u_int32_t ssrc, ddst; 4727 4728 sm = NULL; 4729 ssrc = ddst = 0; 4730 /* 4731 * Pick the first AF_INET address from the list, 4732 * aliases don't make any sense on a p2p link anyway. 4733 */ 4734 si = 0; 4735 IFADDR_FOREACH(ifa, ifp) { 4736 if (ifa->ifa_addr->sa_family == AF_INET) { 4737 si = (struct sockaddr_in *)ifa->ifa_addr; 4738 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4739 if (si) 4740 break; 4741 } 4742 } 4743 if (ifa) { 4744 if (si && si->sin_addr.s_addr) { 4745 ssrc = si->sin_addr.s_addr; 4746 if (srcmask) 4747 *srcmask = ntohl(sm->sin_addr.s_addr); 4748 } 4749 4750 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4751 if (si && si->sin_addr.s_addr) 4752 ddst = si->sin_addr.s_addr; 4753 } 4754 4755 if (dst) *dst = ntohl(ddst); 4756 if (src) *src = ntohl(ssrc); 4757 } 4758 4759 /* 4760 * Set IP addresses. Must be called at splnet. 4761 * If an address is 0, leave it the way it is. 4762 */ 4763 static void 4764 sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr) 4765 { 4766 STDDCL; 4767 struct ifaddr *ifa; 4768 struct sockaddr_in *si, *dest; 4769 4770 /* 4771 * Pick the first AF_INET address from the list, 4772 * aliases don't make any sense on a p2p link anyway. 4773 */ 4774 4775 IFADDR_FOREACH(ifa, ifp) { 4776 if (ifa->ifa_addr->sa_family == AF_INET) { 4777 si = (struct sockaddr_in *)ifa->ifa_addr; 4778 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4779 goto found; 4780 } 4781 } 4782 return; 4783 4784 found: 4785 { 4786 int error; 4787 struct sockaddr_in new_sin = *si; 4788 struct sockaddr_in new_dst = *dest; 4789 4790 /* 4791 * Scrub old routes now instead of calling in_ifinit with 4792 * scrub=1, because we may change the dstaddr 4793 * before the call to in_ifinit. 4794 */ 4795 in_ifscrub(ifp, ifatoia(ifa)); 4796 4797 if (myaddr != 0) 4798 new_sin.sin_addr.s_addr = htonl(myaddr); 4799 if (hisaddr != 0) { 4800 new_dst.sin_addr.s_addr = htonl(hisaddr); 4801 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4802 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4803 *dest = new_dst; /* fix dstaddr in place */ 4804 } 4805 } 4806 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4807 if (debug && error) 4808 { 4809 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4810 " failed, error=%d\n", ifp->if_xname, error); 4811 } 4812 #ifdef PFIL_HOOKS 4813 if (!error) 4814 (void)pfil_run_hooks(&if_pfil, 4815 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4816 #endif 4817 } 4818 } 4819 4820 /* 4821 * Clear IP addresses. Must be called at splnet. 4822 */ 4823 static void 4824 sppp_clear_ip_addrs(struct sppp *sp) 4825 { 4826 struct ifnet *ifp = &sp->pp_if; 4827 struct ifaddr *ifa; 4828 struct sockaddr_in *si, *dest; 4829 4830 u_int32_t remote; 4831 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4832 remote = sp->ipcp.saved_hisaddr; 4833 else 4834 sppp_get_ip_addrs(sp, 0, &remote, 0); 4835 4836 /* 4837 * Pick the first AF_INET address from the list, 4838 * aliases don't make any sense on a p2p link anyway. 4839 */ 4840 4841 IFADDR_FOREACH(ifa, ifp) { 4842 if (ifa->ifa_addr->sa_family == AF_INET) { 4843 si = (struct sockaddr_in *)ifa->ifa_addr; 4844 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4845 goto found; 4846 } 4847 } 4848 return; 4849 4850 found: 4851 { 4852 struct sockaddr_in new_sin = *si; 4853 4854 in_ifscrub(ifp, ifatoia(ifa)); 4855 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4856 new_sin.sin_addr.s_addr = 0; 4857 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4858 /* replace peer addr in place */ 4859 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4860 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4861 #ifdef PFIL_HOOKS 4862 (void)pfil_run_hooks(&if_pfil, 4863 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4864 #endif 4865 } 4866 } 4867 #endif 4868 4869 #ifdef INET6 4870 /* 4871 * Get both IPv6 addresses. 4872 */ 4873 static void 4874 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4875 struct in6_addr *srcmask) 4876 { 4877 struct ifnet *ifp = &sp->pp_if; 4878 struct ifaddr *ifa; 4879 struct sockaddr_in6 *si, *sm; 4880 struct in6_addr ssrc, ddst; 4881 4882 sm = NULL; 4883 memset(&ssrc, 0, sizeof(ssrc)); 4884 memset(&ddst, 0, sizeof(ddst)); 4885 /* 4886 * Pick the first link-local AF_INET6 address from the list, 4887 * aliases don't make any sense on a p2p link anyway. 4888 */ 4889 si = 0; 4890 IFADDR_FOREACH(ifa, ifp) 4891 if (ifa->ifa_addr->sa_family == AF_INET6) { 4892 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4893 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4894 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4895 break; 4896 } 4897 if (ifa) { 4898 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4899 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 4900 if (srcmask) { 4901 bcopy(&sm->sin6_addr, srcmask, 4902 sizeof(*srcmask)); 4903 } 4904 } 4905 4906 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4907 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4908 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 4909 } 4910 4911 if (dst) 4912 bcopy(&ddst, dst, sizeof(*dst)); 4913 if (src) 4914 bcopy(&ssrc, src, sizeof(*src)); 4915 } 4916 4917 #ifdef IPV6CP_MYIFID_DYN 4918 /* 4919 * Generate random ifid. 4920 */ 4921 static void 4922 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 4923 { 4924 /* TBD */ 4925 } 4926 4927 /* 4928 * Set my IPv6 address. Must be called at splnet. 4929 */ 4930 static void 4931 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 4932 { 4933 STDDCL; 4934 struct ifaddr *ifa; 4935 struct sockaddr_in6 *sin6; 4936 4937 /* 4938 * Pick the first link-local AF_INET6 address from the list, 4939 * aliases don't make any sense on a p2p link anyway. 4940 */ 4941 4942 sin6 = NULL; 4943 IFADDR_FOREACH(ifa, ifp) 4944 { 4945 if (ifa->ifa_addr->sa_family == AF_INET6) 4946 { 4947 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 4948 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 4949 break; 4950 } 4951 } 4952 4953 if (ifa && sin6) 4954 { 4955 int error; 4956 struct sockaddr_in6 new_sin6 = *sin6; 4957 4958 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 4959 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 4960 if (debug && error) 4961 { 4962 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 4963 " failed, error=%d\n", ifp->if_xname, error); 4964 } 4965 #ifdef PFIL_HOOKS 4966 if (!error) 4967 (void)pfil_run_hooks(&if_pfil, 4968 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 4969 #endif 4970 } 4971 } 4972 #endif 4973 4974 /* 4975 * Suggest a candidate address to be used by peer. 4976 */ 4977 static void 4978 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 4979 { 4980 struct in6_addr myaddr; 4981 struct timeval tv; 4982 4983 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 4984 4985 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 4986 microtime(&tv); 4987 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 4988 myaddr.s6_addr[14] ^= 0xff; 4989 myaddr.s6_addr[15] ^= 0xff; 4990 } else { 4991 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 4992 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 4993 } 4994 if (suggest) 4995 bcopy(&myaddr, suggest, sizeof(myaddr)); 4996 } 4997 #endif /*INET6*/ 4998 4999 /* 5000 * Process ioctl requests specific to the PPP interface. 5001 * Permissions have already been checked. 5002 */ 5003 static int 5004 sppp_params(struct sppp *sp, int cmd, void *data) 5005 { 5006 switch (cmd) { 5007 case SPPPGETAUTHCFG: 5008 { 5009 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5010 int error; 5011 size_t len; 5012 5013 cfg->myauthflags = sp->myauth.flags; 5014 cfg->hisauthflags = sp->hisauth.flags; 5015 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5016 cfg->hisauth = 0; 5017 if (sp->hisauth.proto) 5018 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5019 cfg->myauth = 0; 5020 if (sp->myauth.proto) 5021 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5022 if (cfg->myname_length == 0) { 5023 if (sp->myauth.name != NULL) 5024 cfg->myname_length = sp->myauth.name_len + 1; 5025 } else { 5026 if (sp->myauth.name == NULL) { 5027 cfg->myname_length = 0; 5028 } else { 5029 len = sp->myauth.name_len + 1; 5030 if (cfg->myname_length < len) 5031 return (ENAMETOOLONG); 5032 error = copyout(sp->myauth.name, cfg->myname, len); 5033 if (error) return error; 5034 } 5035 } 5036 if (cfg->hisname_length == 0) { 5037 if (sp->hisauth.name != NULL) 5038 cfg->hisname_length = sp->hisauth.name_len + 1; 5039 } else { 5040 if (sp->hisauth.name == NULL) { 5041 cfg->hisname_length = 0; 5042 } else { 5043 len = sp->hisauth.name_len + 1; 5044 if (cfg->hisname_length < len) 5045 return (ENAMETOOLONG); 5046 error = copyout(sp->hisauth.name, cfg->hisname, len); 5047 if (error) return error; 5048 } 5049 } 5050 } 5051 break; 5052 case SPPPSETAUTHCFG: 5053 { 5054 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5055 int error; 5056 5057 if (sp->myauth.name) { 5058 free(sp->myauth.name, M_DEVBUF); 5059 sp->myauth.name = NULL; 5060 } 5061 if (sp->myauth.secret) { 5062 free(sp->myauth.secret, M_DEVBUF); 5063 sp->myauth.secret = NULL; 5064 } 5065 if (sp->hisauth.name) { 5066 free(sp->hisauth.name, M_DEVBUF); 5067 sp->hisauth.name = NULL; 5068 } 5069 if (sp->hisauth.secret) { 5070 free(sp->hisauth.secret, M_DEVBUF); 5071 sp->hisauth.secret = NULL; 5072 } 5073 5074 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5075 if (cfg->hisname_length >= MCLBYTES) 5076 return (ENAMETOOLONG); 5077 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5078 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5079 if (error) { 5080 free(sp->hisauth.name, M_DEVBUF); 5081 sp->hisauth.name = NULL; 5082 return error; 5083 } 5084 sp->hisauth.name_len = cfg->hisname_length - 1; 5085 sp->hisauth.name[sp->hisauth.name_len] = 0; 5086 } 5087 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5088 if (cfg->hissecret_length >= MCLBYTES) 5089 return (ENAMETOOLONG); 5090 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5091 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5092 if (error) { 5093 free(sp->hisauth.secret, M_DEVBUF); 5094 sp->hisauth.secret = NULL; 5095 return error; 5096 } 5097 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5098 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5099 } 5100 if (cfg->myname != NULL && cfg->myname_length > 0) { 5101 if (cfg->myname_length >= MCLBYTES) 5102 return (ENAMETOOLONG); 5103 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5104 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5105 if (error) { 5106 free(sp->myauth.name, M_DEVBUF); 5107 sp->myauth.name = NULL; 5108 return error; 5109 } 5110 sp->myauth.name_len = cfg->myname_length - 1; 5111 sp->myauth.name[sp->myauth.name_len] = 0; 5112 } 5113 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5114 if (cfg->mysecret_length >= MCLBYTES) 5115 return (ENAMETOOLONG); 5116 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5117 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5118 if (error) { 5119 free(sp->myauth.secret, M_DEVBUF); 5120 sp->myauth.secret = NULL; 5121 return error; 5122 } 5123 sp->myauth.secret_len = cfg->mysecret_length - 1; 5124 sp->myauth.secret[sp->myauth.secret_len] = 0; 5125 } 5126 sp->myauth.flags = cfg->myauthflags; 5127 if (cfg->myauth) 5128 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5129 sp->hisauth.flags = cfg->hisauthflags; 5130 if (cfg->hisauth) 5131 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5132 sp->pp_auth_failures = 0; 5133 if (sp->hisauth.proto != 0) 5134 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5135 else 5136 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5137 } 5138 break; 5139 case SPPPGETLCPCFG: 5140 { 5141 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5142 lcpp->lcp_timeout = sp->lcp.timeout; 5143 } 5144 break; 5145 case SPPPSETLCPCFG: 5146 { 5147 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5148 sp->lcp.timeout = lcpp->lcp_timeout; 5149 } 5150 break; 5151 case SPPPGETSTATUS: 5152 { 5153 struct spppstatus *status = (struct spppstatus *)data; 5154 status->phase = sp->pp_phase; 5155 } 5156 break; 5157 case SPPPGETSTATUSNCP: 5158 { 5159 struct spppstatusncp *status = (struct spppstatusncp *)data; 5160 status->phase = sp->pp_phase; 5161 status->ncpup = sppp_ncp_check(sp); 5162 } 5163 break; 5164 case SPPPGETIDLETO: 5165 { 5166 struct spppidletimeout *to = (struct spppidletimeout *)data; 5167 to->idle_seconds = sp->pp_idle_timeout; 5168 } 5169 break; 5170 case SPPPSETIDLETO: 5171 { 5172 struct spppidletimeout *to = (struct spppidletimeout *)data; 5173 sp->pp_idle_timeout = to->idle_seconds; 5174 } 5175 break; 5176 case SPPPSETAUTHFAILURE: 5177 { 5178 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5179 sp->pp_max_auth_fail = afsettings->max_failures; 5180 sp->pp_auth_failures = 0; 5181 } 5182 break; 5183 case SPPPGETAUTHFAILURES: 5184 { 5185 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5186 stats->auth_failures = sp->pp_auth_failures; 5187 stats->max_failures = sp->pp_max_auth_fail; 5188 } 5189 break; 5190 case SPPPSETDNSOPTS: 5191 { 5192 struct spppdnssettings *req = (struct spppdnssettings *)data; 5193 sp->query_dns = req->query_dns & 3; 5194 } 5195 break; 5196 case SPPPGETDNSOPTS: 5197 { 5198 struct spppdnssettings *req = (struct spppdnssettings *)data; 5199 req->query_dns = sp->query_dns; 5200 } 5201 break; 5202 case SPPPGETDNSADDRS: 5203 { 5204 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5205 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5206 } 5207 break; 5208 case SPPPGETKEEPALIVE: 5209 { 5210 struct spppkeepalivesettings *settings = 5211 (struct spppkeepalivesettings*)data; 5212 settings->maxalive = sp->pp_maxalive; 5213 settings->max_noreceive = sp->pp_max_noreceive; 5214 } 5215 break; 5216 case SPPPSETKEEPALIVE: 5217 { 5218 struct spppkeepalivesettings *settings = 5219 (struct spppkeepalivesettings*)data; 5220 sp->pp_maxalive = settings->maxalive; 5221 sp->pp_max_noreceive = settings->max_noreceive; 5222 } 5223 break; 5224 default: 5225 return (EINVAL); 5226 } 5227 5228 return (0); 5229 } 5230 5231 static void 5232 sppp_phase_network(struct sppp *sp) 5233 { 5234 STDDCL; 5235 int i; 5236 u_int32_t mask; 5237 5238 sp->pp_phase = SPPP_PHASE_NETWORK; 5239 5240 if (debug) 5241 { 5242 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5243 sppp_phase_name(sp->pp_phase)); 5244 } 5245 5246 /* Notify NCPs now. */ 5247 for (i = 0; i < IDX_COUNT; i++) 5248 if ((cps[i])->flags & CP_NCP) 5249 (cps[i])->Open(sp); 5250 5251 /* Send Up events to all NCPs. */ 5252 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5253 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5254 (cps[i])->Up(sp); 5255 5256 /* if no NCP is starting, all this was in vain, close down */ 5257 sppp_lcp_check_and_close(sp); 5258 } 5259 5260 5261 static const char * 5262 sppp_cp_type_name(u_char type) 5263 { 5264 static char buf[12]; 5265 switch (type) { 5266 case CONF_REQ: return "conf-req"; 5267 case CONF_ACK: return "conf-ack"; 5268 case CONF_NAK: return "conf-nak"; 5269 case CONF_REJ: return "conf-rej"; 5270 case TERM_REQ: return "term-req"; 5271 case TERM_ACK: return "term-ack"; 5272 case CODE_REJ: return "code-rej"; 5273 case PROTO_REJ: return "proto-rej"; 5274 case ECHO_REQ: return "echo-req"; 5275 case ECHO_REPLY: return "echo-reply"; 5276 case DISC_REQ: return "discard-req"; 5277 } 5278 snprintf(buf, sizeof(buf), "0x%x", type); 5279 return buf; 5280 } 5281 5282 static const char * 5283 sppp_auth_type_name(u_short proto, u_char type) 5284 { 5285 static char buf[12]; 5286 switch (proto) { 5287 case PPP_CHAP: 5288 switch (type) { 5289 case CHAP_CHALLENGE: return "challenge"; 5290 case CHAP_RESPONSE: return "response"; 5291 case CHAP_SUCCESS: return "success"; 5292 case CHAP_FAILURE: return "failure"; 5293 } 5294 case PPP_PAP: 5295 switch (type) { 5296 case PAP_REQ: return "req"; 5297 case PAP_ACK: return "ack"; 5298 case PAP_NAK: return "nak"; 5299 } 5300 } 5301 snprintf(buf, sizeof(buf), "0x%x", type); 5302 return buf; 5303 } 5304 5305 static const char * 5306 sppp_lcp_opt_name(u_char opt) 5307 { 5308 static char buf[12]; 5309 switch (opt) { 5310 case LCP_OPT_MRU: return "mru"; 5311 case LCP_OPT_ASYNC_MAP: return "async-map"; 5312 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5313 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5314 case LCP_OPT_MAGIC: return "magic"; 5315 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5316 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5317 } 5318 snprintf(buf, sizeof(buf), "0x%x", opt); 5319 return buf; 5320 } 5321 5322 static const char * 5323 sppp_ipcp_opt_name(u_char opt) 5324 { 5325 static char buf[12]; 5326 switch (opt) { 5327 case IPCP_OPT_ADDRESSES: return "addresses"; 5328 case IPCP_OPT_COMPRESSION: return "compression"; 5329 case IPCP_OPT_ADDRESS: return "address"; 5330 } 5331 snprintf(buf, sizeof(buf), "0x%x", opt); 5332 return buf; 5333 } 5334 5335 #ifdef INET6 5336 static const char * 5337 sppp_ipv6cp_opt_name(u_char opt) 5338 { 5339 static char buf[12]; 5340 switch (opt) { 5341 case IPV6CP_OPT_IFID: return "ifid"; 5342 case IPV6CP_OPT_COMPRESSION: return "compression"; 5343 } 5344 snprintf(buf, sizeof(buf), "0x%x", opt); 5345 return buf; 5346 } 5347 #endif 5348 5349 static const char * 5350 sppp_state_name(int state) 5351 { 5352 switch (state) { 5353 case STATE_INITIAL: return "initial"; 5354 case STATE_STARTING: return "starting"; 5355 case STATE_CLOSED: return "closed"; 5356 case STATE_STOPPED: return "stopped"; 5357 case STATE_CLOSING: return "closing"; 5358 case STATE_STOPPING: return "stopping"; 5359 case STATE_REQ_SENT: return "req-sent"; 5360 case STATE_ACK_RCVD: return "ack-rcvd"; 5361 case STATE_ACK_SENT: return "ack-sent"; 5362 case STATE_OPENED: return "opened"; 5363 } 5364 return "illegal"; 5365 } 5366 5367 static const char * 5368 sppp_phase_name(int phase) 5369 { 5370 switch (phase) { 5371 case SPPP_PHASE_DEAD: return "dead"; 5372 case SPPP_PHASE_ESTABLISH: return "establish"; 5373 case SPPP_PHASE_TERMINATE: return "terminate"; 5374 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5375 case SPPP_PHASE_NETWORK: return "network"; 5376 } 5377 return "illegal"; 5378 } 5379 5380 static const char * 5381 sppp_proto_name(u_short proto) 5382 { 5383 static char buf[12]; 5384 switch (proto) { 5385 case PPP_LCP: return "lcp"; 5386 case PPP_IPCP: return "ipcp"; 5387 case PPP_PAP: return "pap"; 5388 case PPP_CHAP: return "chap"; 5389 case PPP_IPV6CP: return "ipv6cp"; 5390 } 5391 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5392 return buf; 5393 } 5394 5395 static void 5396 sppp_print_bytes(const u_char *p, u_short len) 5397 { 5398 addlog(" %02x", *p++); 5399 while (--len > 0) 5400 addlog("-%02x", *p++); 5401 } 5402 5403 static void 5404 sppp_print_string(const char *p, u_short len) 5405 { 5406 u_char c; 5407 5408 while (len-- > 0) { 5409 c = *p++; 5410 /* 5411 * Print only ASCII chars directly. RFC 1994 recommends 5412 * using only them, but we don't rely on it. */ 5413 if (c < ' ' || c > '~') 5414 addlog("\\x%x", c); 5415 else 5416 addlog("%c", c); 5417 } 5418 } 5419 5420 static const char * 5421 sppp_dotted_quad(u_int32_t addr) 5422 { 5423 static char s[16]; 5424 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5425 (int)((addr >> 24) & 0xff), 5426 (int)((addr >> 16) & 0xff), 5427 (int)((addr >> 8) & 0xff), 5428 (int)(addr & 0xff)); 5429 return s; 5430 } 5431 5432 /* a dummy, used to drop uninteresting events */ 5433 static void 5434 sppp_null(struct sppp *unused) 5435 { 5436 /* do just nothing */ 5437 } 5438 /* 5439 * This file is large. Tell emacs to highlight it nevertheless. 5440 * 5441 * Local Variables: 5442 * hilit-auto-highlight-maxout: 120000 5443 * End: 5444 */ 5445
Indexes created Mon Oct 13 16:09:52 GMT 2025