if_spppsubr.c revision 1.85
1 /* $NetBSD: if_spppsubr.c,v 1.85 2005/05/29 21:22:53 christos 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 1.85 2005/05/29 21:22:53 christos 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 IPX 83 #include <netipx/ipx.h> 84 #include <netipx/ipx_if.h> 85 #endif 86 87 #ifdef NS 88 #include <netns/ns.h> 89 #include <netns/ns_if.h> 90 #endif 91 92 #ifdef ISO 93 #include <netiso/argo_debug.h> 94 #include <netiso/iso.h> 95 #include <netiso/iso_var.h> 96 #include <netiso/iso_snpac.h> 97 #endif 98 99 #include <net/if_sppp.h> 100 #include <net/if_spppvar.h> 101 102 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 103 #define LOOPALIVECNT 3 /* loopback detection tries */ 104 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 105 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 106 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 107 108 /* 109 * Interface flags that can be set in an ifconfig command. 110 * 111 * Setting link0 will make the link passive, i.e. it will be marked 112 * as being administrative openable, but won't be opened to begin 113 * with. Incoming calls will be answered, or subsequent calls with 114 * -link1 will cause the administrative open of the LCP layer. 115 * 116 * Setting link1 will cause the link to auto-dial only as packets 117 * arrive to be sent. 118 * 119 * Setting IFF_DEBUG will syslog the option negotiation and state 120 * transitions at level kern.debug. Note: all logs consistently look 121 * like 122 * 123 * <if-name><unit>: <proto-name> <additional info...> 124 * 125 * with <if-name><unit> being something like "bppp0", and <proto-name> 126 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 127 */ 128 129 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 130 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 131 132 #define CONF_REQ 1 /* PPP configure request */ 133 #define CONF_ACK 2 /* PPP configure acknowledge */ 134 #define CONF_NAK 3 /* PPP configure negative ack */ 135 #define CONF_REJ 4 /* PPP configure reject */ 136 #define TERM_REQ 5 /* PPP terminate request */ 137 #define TERM_ACK 6 /* PPP terminate acknowledge */ 138 #define CODE_REJ 7 /* PPP code reject */ 139 #define PROTO_REJ 8 /* PPP protocol reject */ 140 #define ECHO_REQ 9 /* PPP echo request */ 141 #define ECHO_REPLY 10 /* PPP echo reply */ 142 #define DISC_REQ 11 /* PPP discard request */ 143 144 #define LCP_OPT_MRU 1 /* maximum receive unit */ 145 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 146 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 147 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 148 #define LCP_OPT_MAGIC 5 /* magic number */ 149 #define LCP_OPT_RESERVED 6 /* reserved */ 150 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 151 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 152 153 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 154 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 155 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 156 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 157 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 158 159 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 160 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 161 162 #define PAP_REQ 1 /* PAP name/password request */ 163 #define PAP_ACK 2 /* PAP acknowledge */ 164 #define PAP_NAK 3 /* PAP fail */ 165 166 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 167 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 168 #define CHAP_SUCCESS 3 /* CHAP response ok */ 169 #define CHAP_FAILURE 4 /* CHAP response failed */ 170 171 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 172 173 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 174 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 175 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 176 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 177 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 178 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 179 180 /* states are named and numbered according to RFC 1661 */ 181 #define STATE_INITIAL 0 182 #define STATE_STARTING 1 183 #define STATE_CLOSED 2 184 #define STATE_STOPPED 3 185 #define STATE_CLOSING 4 186 #define STATE_STOPPING 5 187 #define STATE_REQ_SENT 6 188 #define STATE_ACK_RCVD 7 189 #define STATE_ACK_SENT 8 190 #define STATE_OPENED 9 191 192 struct ppp_header { 193 u_int8_t address; 194 u_int8_t control; 195 u_int16_t protocol; 196 } __attribute__((__packed__)); 197 #define PPP_HEADER_LEN sizeof (struct ppp_header) 198 199 struct lcp_header { 200 u_int8_t type; 201 u_int8_t ident; 202 u_int16_t len; 203 } __attribute__((__packed__)); 204 #define LCP_HEADER_LEN sizeof (struct lcp_header) 205 206 struct cisco_packet { 207 u_int32_t type; 208 u_int32_t par1; 209 u_int32_t par2; 210 u_int16_t rel; 211 u_int16_t time0; 212 u_int16_t time1; 213 } __attribute__((__packed__)); 214 #define CISCO_PACKET_LEN 18 215 216 /* 217 * We follow the spelling and capitalization of RFC 1661 here, to make 218 * it easier comparing with the standard. Please refer to this RFC in 219 * case you can't make sense out of these abbreviation; it will also 220 * explain the semantics related to the various events and actions. 221 */ 222 struct cp { 223 u_short proto; /* PPP control protocol number */ 224 u_char protoidx; /* index into state table in struct sppp */ 225 u_char flags; 226 #define CP_LCP 0x01 /* this is the LCP */ 227 #define CP_AUTH 0x02 /* this is an authentication protocol */ 228 #define CP_NCP 0x04 /* this is a NCP */ 229 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 230 const char *name; /* name of this control protocol */ 231 /* event handlers */ 232 void (*Up)(struct sppp *sp); 233 void (*Down)(struct sppp *sp); 234 void (*Open)(struct sppp *sp); 235 void (*Close)(struct sppp *sp); 236 void (*TO)(void *sp); 237 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 238 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 239 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 240 /* actions */ 241 void (*tlu)(struct sppp *sp); 242 void (*tld)(struct sppp *sp); 243 void (*tls)(struct sppp *sp); 244 void (*tlf)(struct sppp *sp); 245 void (*scr)(struct sppp *sp); 246 }; 247 248 static struct sppp *spppq; 249 static struct callout keepalive_ch; 250 251 #ifdef INET 252 /* 253 * The following disgusting hack gets around the problem that IP TOS 254 * can't be set yet. We want to put "interactive" traffic on a high 255 * priority queue. To decide if traffic is interactive, we check that 256 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 257 * 258 * XXX is this really still necessary? - joerg - 259 */ 260 static u_short interactive_ports[8] = { 261 0, 513, 0, 0, 262 0, 21, 0, 23, 263 }; 264 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 265 #endif 266 267 /* almost every function needs these */ 268 #define STDDCL \ 269 struct ifnet *ifp = &sp->pp_if; \ 270 int debug = ifp->if_flags & IFF_DEBUG 271 272 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 273 struct sockaddr *dst, struct rtentry *rt); 274 275 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 276 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 277 278 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 279 struct mbuf *m); 280 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 281 u_char ident, u_short len, void *data); 282 /* static void sppp_cp_timeout(void *arg); */ 283 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 284 int newstate); 285 static void sppp_auth_send(const struct cp *cp, 286 struct sppp *sp, unsigned int type, unsigned int id, 287 ...); 288 289 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 290 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 291 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 292 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 293 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 294 295 static void sppp_null(struct sppp *sp); 296 297 static void sppp_lcp_init(struct sppp *sp); 298 static void sppp_lcp_up(struct sppp *sp); 299 static void sppp_lcp_down(struct sppp *sp); 300 static void sppp_lcp_open(struct sppp *sp); 301 static void sppp_lcp_close(struct sppp *sp); 302 static void sppp_lcp_TO(void *sp); 303 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 304 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 305 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 306 static void sppp_lcp_tlu(struct sppp *sp); 307 static void sppp_lcp_tld(struct sppp *sp); 308 static void sppp_lcp_tls(struct sppp *sp); 309 static void sppp_lcp_tlf(struct sppp *sp); 310 static void sppp_lcp_scr(struct sppp *sp); 311 static void sppp_lcp_check_and_close(struct sppp *sp); 312 static int sppp_ncp_check(struct sppp *sp); 313 314 static void sppp_ipcp_init(struct sppp *sp); 315 static void sppp_ipcp_up(struct sppp *sp); 316 static void sppp_ipcp_down(struct sppp *sp); 317 static void sppp_ipcp_open(struct sppp *sp); 318 static void sppp_ipcp_close(struct sppp *sp); 319 static void sppp_ipcp_TO(void *sp); 320 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 321 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 322 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 323 static void sppp_ipcp_tlu(struct sppp *sp); 324 static void sppp_ipcp_tld(struct sppp *sp); 325 static void sppp_ipcp_tls(struct sppp *sp); 326 static void sppp_ipcp_tlf(struct sppp *sp); 327 static void sppp_ipcp_scr(struct sppp *sp); 328 329 static void sppp_ipv6cp_init(struct sppp *sp); 330 static void sppp_ipv6cp_up(struct sppp *sp); 331 static void sppp_ipv6cp_down(struct sppp *sp); 332 static void sppp_ipv6cp_open(struct sppp *sp); 333 static void sppp_ipv6cp_close(struct sppp *sp); 334 static void sppp_ipv6cp_TO(void *sp); 335 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 336 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 337 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 338 static void sppp_ipv6cp_tlu(struct sppp *sp); 339 static void sppp_ipv6cp_tld(struct sppp *sp); 340 static void sppp_ipv6cp_tls(struct sppp *sp); 341 static void sppp_ipv6cp_tlf(struct sppp *sp); 342 static void sppp_ipv6cp_scr(struct sppp *sp); 343 344 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 345 static void sppp_pap_init(struct sppp *sp); 346 static void sppp_pap_open(struct sppp *sp); 347 static void sppp_pap_close(struct sppp *sp); 348 static void sppp_pap_TO(void *sp); 349 static void sppp_pap_my_TO(void *sp); 350 static void sppp_pap_tlu(struct sppp *sp); 351 static void sppp_pap_tld(struct sppp *sp); 352 static void sppp_pap_scr(struct sppp *sp); 353 354 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 355 static void sppp_chap_init(struct sppp *sp); 356 static void sppp_chap_open(struct sppp *sp); 357 static void sppp_chap_close(struct sppp *sp); 358 static void sppp_chap_TO(void *sp); 359 static void sppp_chap_tlu(struct sppp *sp); 360 static void sppp_chap_tld(struct sppp *sp); 361 static void sppp_chap_scr(struct sppp *sp); 362 363 static const char *sppp_auth_type_name(u_short proto, u_char type); 364 static const char *sppp_cp_type_name(u_char type); 365 static const char *sppp_dotted_quad(u_int32_t addr); 366 static const char *sppp_ipcp_opt_name(u_char opt); 367 #ifdef INET6 368 static const char *sppp_ipv6cp_opt_name(u_char opt); 369 #endif 370 static const char *sppp_lcp_opt_name(u_char opt); 371 static const char *sppp_phase_name(int phase); 372 static const char *sppp_proto_name(u_short proto); 373 static const char *sppp_state_name(int state); 374 static int sppp_params(struct sppp *sp, int cmd, void *data); 375 #ifdef INET 376 static void sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, 377 u_int32_t *srcmask); 378 static void sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr); 379 static void sppp_clear_ip_addrs(struct sppp *sp); 380 #endif 381 static void sppp_keepalive(void *dummy); 382 static void sppp_phase_network(struct sppp *sp); 383 static void sppp_print_bytes(const u_char *p, u_short len); 384 static void sppp_print_string(const char *p, u_short len); 385 #ifdef INET6 386 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 387 struct in6_addr *dst, struct in6_addr *srcmask); 388 #ifdef IPV6CP_MYIFID_DYN 389 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 390 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 391 #endif 392 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 393 #endif 394 395 /* our control protocol descriptors */ 396 static const struct cp lcp = { 397 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 398 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 399 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 400 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 401 sppp_lcp_scr 402 }; 403 404 static const struct cp ipcp = { 405 PPP_IPCP, IDX_IPCP, 406 #ifdef INET 407 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 408 #else 409 0, 410 #endif 411 "ipcp", 412 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 413 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 414 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 415 sppp_ipcp_scr 416 }; 417 418 static const struct cp ipv6cp = { 419 PPP_IPV6CP, IDX_IPV6CP, 420 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 421 CP_NCP, 422 #else 423 0, 424 #endif 425 "ipv6cp", 426 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 427 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 428 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 429 sppp_ipv6cp_scr 430 }; 431 432 static const struct cp pap = { 433 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 434 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 435 sppp_pap_TO, 0, 0, 0, 436 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 437 sppp_pap_scr 438 }; 439 440 static const struct cp chap = { 441 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 442 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 443 sppp_chap_TO, 0, 0, 0, 444 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 445 sppp_chap_scr 446 }; 447 448 static const struct cp *cps[IDX_COUNT] = { 449 &lcp, /* IDX_LCP */ 450 &ipcp, /* IDX_IPCP */ 451 &ipv6cp, /* IDX_IPV6CP */ 452 &pap, /* IDX_PAP */ 453 &chap, /* IDX_CHAP */ 454 }; 455 456 457 /* 458 * Exported functions, comprising our interface to the lower layer. 459 */ 460 461 /* 462 * Process the received packet. 463 */ 464 void 465 sppp_input(struct ifnet *ifp, struct mbuf *m) 466 { 467 struct ppp_header *h = NULL; 468 struct ifqueue *inq = 0; 469 u_int16_t protocol; 470 int s; 471 struct sppp *sp = (struct sppp *)ifp; 472 int debug = ifp->if_flags & IFF_DEBUG; 473 474 if (ifp->if_flags & IFF_UP) { 475 /* Count received bytes, add hardware framing */ 476 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 477 /* Note time of last receive */ 478 sp->pp_last_receive = mono_time.tv_sec; 479 } 480 481 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 482 /* Too small packet, drop it. */ 483 if (debug) 484 log(LOG_DEBUG, 485 "%s: input packet is too small, %d bytes\n", 486 ifp->if_xname, m->m_pkthdr.len); 487 drop: 488 ++ifp->if_ierrors; 489 ++ifp->if_iqdrops; 490 m_freem(m); 491 return; 492 } 493 494 if (sp->pp_flags & PP_NOFRAMING) { 495 memcpy(&protocol, mtod(m, void *), 2); 496 protocol = ntohs(protocol); 497 m_adj(m, 2); 498 } else { 499 500 /* Get PPP header. */ 501 h = mtod(m, struct ppp_header *); 502 m_adj(m, PPP_HEADER_LEN); 503 504 switch (h->address) { 505 case PPP_ALLSTATIONS: 506 if (h->control != PPP_UI) 507 goto invalid; 508 if (sp->pp_flags & PP_CISCO) { 509 if (debug) 510 log(LOG_DEBUG, 511 "%s: PPP packet in Cisco mode " 512 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 513 ifp->if_xname, 514 h->address, h->control, ntohs(h->protocol)); 515 goto drop; 516 } 517 break; 518 case CISCO_MULTICAST: 519 case CISCO_UNICAST: 520 /* Don't check the control field here (RFC 1547). */ 521 if (! (sp->pp_flags & PP_CISCO)) { 522 if (debug) 523 log(LOG_DEBUG, 524 "%s: Cisco packet in PPP mode " 525 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 526 ifp->if_xname, 527 h->address, h->control, ntohs(h->protocol)); 528 goto drop; 529 } 530 switch (ntohs(h->protocol)) { 531 default: 532 ++ifp->if_noproto; 533 goto invalid; 534 case CISCO_KEEPALIVE: 535 sppp_cisco_input((struct sppp *) ifp, m); 536 m_freem(m); 537 return; 538 #ifdef INET 539 case ETHERTYPE_IP: 540 schednetisr(NETISR_IP); 541 inq = &ipintrq; 542 break; 543 #endif 544 #ifdef INET6 545 case ETHERTYPE_IPV6: 546 schednetisr(NETISR_IPV6); 547 inq = &ip6intrq; 548 break; 549 #endif 550 #ifdef IPX 551 case ETHERTYPE_IPX: 552 schednetisr(NETISR_IPX); 553 inq = &ipxintrq; 554 break; 555 #endif 556 #ifdef NS 557 case ETHERTYPE_NS: 558 schednetisr(NETISR_NS); 559 inq = &nsintrq; 560 break; 561 #endif 562 } 563 goto queue_pkt; 564 default: /* Invalid PPP packet. */ 565 invalid: 566 if (debug) 567 log(LOG_DEBUG, 568 "%s: invalid input packet " 569 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 570 ifp->if_xname, 571 h->address, h->control, ntohs(h->protocol)); 572 goto drop; 573 } 574 protocol = ntohs(h->protocol); 575 } 576 577 switch (protocol) { 578 default: 579 if (sp->state[IDX_LCP] == STATE_OPENED) { 580 u_int16_t prot = htons(protocol); 581 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 582 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 583 &prot); 584 } 585 if (debug) 586 log(LOG_DEBUG, 587 "%s: invalid input protocol " 588 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 589 ++ifp->if_noproto; 590 goto drop; 591 case PPP_LCP: 592 sppp_cp_input(&lcp, sp, m); 593 m_freem(m); 594 return; 595 case PPP_PAP: 596 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 597 sppp_pap_input(sp, m); 598 m_freem(m); 599 return; 600 case PPP_CHAP: 601 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 602 sppp_chap_input(sp, m); 603 m_freem(m); 604 return; 605 #ifdef INET 606 case PPP_IPCP: 607 if (sp->pp_phase == SPPP_PHASE_NETWORK) 608 sppp_cp_input(&ipcp, sp, m); 609 m_freem(m); 610 return; 611 case PPP_IP: 612 if (sp->state[IDX_IPCP] == STATE_OPENED) { 613 schednetisr(NETISR_IP); 614 inq = &ipintrq; 615 sp->pp_last_activity = mono_time.tv_sec; 616 } 617 break; 618 #endif 619 #ifdef INET6 620 case PPP_IPV6CP: 621 if (sp->pp_phase == SPPP_PHASE_NETWORK) 622 sppp_cp_input(&ipv6cp, sp, m); 623 m_freem(m); 624 return; 625 626 case PPP_IPV6: 627 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 628 schednetisr(NETISR_IPV6); 629 inq = &ip6intrq; 630 sp->pp_last_activity = mono_time.tv_sec; 631 } 632 break; 633 #endif 634 #ifdef IPX 635 case PPP_IPX: 636 /* IPX IPXCP not implemented yet */ 637 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 638 schednetisr(NETISR_IPX); 639 inq = &ipxintrq; 640 } 641 break; 642 #endif 643 #ifdef NS 644 case PPP_XNS: 645 /* XNS IDPCP not implemented yet */ 646 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 647 schednetisr(NETISR_NS); 648 inq = &nsintrq; 649 } 650 break; 651 #endif 652 #ifdef ISO 653 case PPP_ISO: 654 /* OSI NLCP not implemented yet */ 655 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 656 schednetisr(NETISR_ISO); 657 inq = &clnlintrq; 658 } 659 break; 660 #endif 661 } 662 663 queue_pkt: 664 if (! (ifp->if_flags & IFF_UP) || ! inq) 665 goto drop; 666 667 /* Check queue. */ 668 s = splnet(); 669 if (IF_QFULL(inq)) { 670 /* Queue overflow. */ 671 IF_DROP(inq); 672 splx(s); 673 if (debug) 674 log(LOG_DEBUG, "%s: protocol queue overflow\n", 675 ifp->if_xname); 676 goto drop; 677 } 678 IF_ENQUEUE(inq, m); 679 splx(s); 680 } 681 682 /* 683 * Enqueue transmit packet. 684 */ 685 static int 686 sppp_output(struct ifnet *ifp, struct mbuf *m, 687 struct sockaddr *dst, struct rtentry *rt) 688 { 689 struct sppp *sp = (struct sppp *) ifp; 690 struct ppp_header *h = NULL; 691 struct ifqueue *ifq = NULL; /* XXX */ 692 int s, error = 0; 693 u_int16_t protocol; 694 ALTQ_DECL(struct altq_pktattr pktattr;) 695 696 s = splnet(); 697 698 sp->pp_last_activity = mono_time.tv_sec; 699 700 if ((ifp->if_flags & IFF_UP) == 0 || 701 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 702 m_freem(m); 703 splx(s); 704 return (ENETDOWN); 705 } 706 707 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 708 /* 709 * Interface is not yet running, but auto-dial. Need 710 * to start LCP for it. 711 */ 712 ifp->if_flags |= IFF_RUNNING; 713 splx(s); 714 lcp.Open(sp); 715 s = splnet(); 716 } 717 718 /* 719 * If the queueing discipline needs packet classification, 720 * do it before prepending link headers. 721 */ 722 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 723 724 #ifdef INET 725 if (dst->sa_family == AF_INET) { 726 struct ip *ip = NULL; 727 struct tcphdr *th = NULL; 728 729 if (m->m_len >= sizeof(struct ip)) { 730 ip = mtod(m, struct ip *); 731 if (ip->ip_p == IPPROTO_TCP && 732 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 733 sizeof(struct tcphdr)) { 734 th = (struct tcphdr *) 735 ((caddr_t)ip + (ip->ip_hl << 2)); 736 } 737 } else 738 ip = NULL; 739 740 /* 741 * When using dynamic local IP address assignment by using 742 * 0.0.0.0 as a local address, the first TCP session will 743 * not connect because the local TCP checksum is computed 744 * using 0.0.0.0 which will later become our real IP address 745 * so the TCP checksum computed at the remote end will 746 * become invalid. So we 747 * - don't let packets with src ip addr 0 thru 748 * - we flag TCP packets with src ip 0 as an error 749 */ 750 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 751 u_int8_t proto = ip->ip_p; 752 753 m_freem(m); 754 splx(s); 755 if (proto == IPPROTO_TCP) 756 return (EADDRNOTAVAIL); 757 else 758 return (0); 759 } 760 761 /* 762 * Put low delay, telnet, rlogin and ftp control packets 763 * in front of the queue. 764 */ 765 766 if (!IF_QFULL(&sp->pp_fastq) && 767 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 768 (th && (INTERACTIVE(ntohs(th->th_sport)) || 769 INTERACTIVE(ntohs(th->th_dport)))))) 770 ifq = &sp->pp_fastq; 771 } 772 #endif 773 774 #ifdef INET6 775 if (dst->sa_family == AF_INET6) { 776 /* XXX do something tricky here? */ 777 } 778 #endif 779 780 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 781 /* 782 * Prepend general data packet PPP header. For now, IP only. 783 */ 784 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 785 if (! m) { 786 if (ifp->if_flags & IFF_DEBUG) 787 log(LOG_DEBUG, "%s: no memory for transmit header\n", 788 ifp->if_xname); 789 ++ifp->if_oerrors; 790 splx(s); 791 return (ENOBUFS); 792 } 793 /* 794 * May want to check size of packet 795 * (albeit due to the implementation it's always enough) 796 */ 797 h = mtod(m, struct ppp_header *); 798 if (sp->pp_flags & PP_CISCO) { 799 h->address = CISCO_UNICAST; /* unicast address */ 800 h->control = 0; 801 } else { 802 h->address = PPP_ALLSTATIONS; /* broadcast address */ 803 h->control = PPP_UI; /* Unnumbered Info */ 804 } 805 } 806 807 switch (dst->sa_family) { 808 #ifdef INET 809 case AF_INET: /* Internet Protocol */ 810 if (sp->pp_flags & PP_CISCO) 811 protocol = htons(ETHERTYPE_IP); 812 else { 813 /* 814 * Don't choke with an ENETDOWN early. It's 815 * possible that we just started dialing out, 816 * so don't drop the packet immediately. If 817 * we notice that we run out of buffer space 818 * below, we will however remember that we are 819 * not ready to carry IP packets, and return 820 * ENETDOWN, as opposed to ENOBUFS. 821 */ 822 protocol = htons(PPP_IP); 823 if (sp->state[IDX_IPCP] != STATE_OPENED) 824 error = ENETDOWN; 825 } 826 break; 827 #endif 828 #ifdef INET6 829 case AF_INET6: /* Internet Protocol version 6 */ 830 if (sp->pp_flags & PP_CISCO) 831 protocol = htons(ETHERTYPE_IPV6); 832 else { 833 /* 834 * Don't choke with an ENETDOWN early. It's 835 * possible that we just started dialing out, 836 * so don't drop the packet immediately. If 837 * we notice that we run out of buffer space 838 * below, we will however remember that we are 839 * not ready to carry IP packets, and return 840 * ENETDOWN, as opposed to ENOBUFS. 841 */ 842 protocol = htons(PPP_IPV6); 843 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 844 error = ENETDOWN; 845 } 846 break; 847 #endif 848 #ifdef NS 849 case AF_NS: /* Xerox NS Protocol */ 850 protocol = htons((sp->pp_flags & PP_CISCO) ? 851 ETHERTYPE_NS : PPP_XNS); 852 break; 853 #endif 854 #ifdef IPX 855 case AF_IPX: /* Novell IPX Protocol */ 856 protocol = htons((sp->pp_flags & PP_CISCO) ? 857 ETHERTYPE_IPX : PPP_IPX); 858 break; 859 #endif 860 #ifdef ISO 861 case AF_ISO: /* ISO OSI Protocol */ 862 if (sp->pp_flags & PP_CISCO) 863 goto nosupport; 864 protocol = htons(PPP_ISO); 865 break; 866 nosupport: 867 #endif 868 default: 869 m_freem(m); 870 ++ifp->if_oerrors; 871 splx(s); 872 return (EAFNOSUPPORT); 873 } 874 875 if (sp->pp_flags & PP_NOFRAMING) { 876 M_PREPEND(m, 2, M_DONTWAIT); 877 if (m == NULL) { 878 if (ifp->if_flags & IFF_DEBUG) 879 log(LOG_DEBUG, "%s: no memory for transmit header\n", 880 ifp->if_xname); 881 ++ifp->if_oerrors; 882 splx(s); 883 return (ENOBUFS); 884 } 885 *mtod(m, u_int16_t *) = protocol; 886 } else { 887 h->protocol = protocol; 888 } 889 890 891 error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 892 893 if (error == 0) { 894 /* 895 * Count output packets and bytes. 896 * The packet length includes header + additional hardware 897 * framing according to RFC 1333. 898 */ 899 if (!(ifp->if_flags & IFF_OACTIVE)) 900 (*ifp->if_start)(ifp); 901 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 902 } 903 splx(s); 904 return error; 905 } 906 907 void 908 sppp_attach(struct ifnet *ifp) 909 { 910 struct sppp *sp = (struct sppp *) ifp; 911 912 /* Initialize keepalive handler. */ 913 if (! spppq) { 914 callout_init(&keepalive_ch); 915 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 916 } 917 918 /* Insert new entry into the keepalive list. */ 919 sp->pp_next = spppq; 920 spppq = sp; 921 922 sp->pp_if.if_type = IFT_PPP; 923 sp->pp_if.if_output = sppp_output; 924 sp->pp_fastq.ifq_maxlen = 32; 925 sp->pp_cpq.ifq_maxlen = 20; 926 sp->pp_loopcnt = 0; 927 sp->pp_alivecnt = 0; 928 sp->pp_last_activity = 0; 929 sp->pp_last_receive = 0; 930 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 931 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 932 sp->pp_idle_timeout = 0; 933 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 934 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 935 sp->pp_auth_failures = 0; 936 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 937 sp->pp_phase = SPPP_PHASE_DEAD; 938 sp->pp_up = lcp.Up; 939 sp->pp_down = lcp.Down; 940 941 if_alloc_sadl(ifp); 942 943 memset(&sp->myauth, 0, sizeof sp->myauth); 944 memset(&sp->hisauth, 0, sizeof sp->hisauth); 945 sppp_lcp_init(sp); 946 sppp_ipcp_init(sp); 947 sppp_ipv6cp_init(sp); 948 sppp_pap_init(sp); 949 sppp_chap_init(sp); 950 } 951 952 void 953 sppp_detach(struct ifnet *ifp) 954 { 955 struct sppp **q, *p, *sp = (struct sppp *) ifp; 956 int i; 957 958 /* Remove the entry from the keepalive list. */ 959 for (q = &spppq; (p = *q); q = &p->pp_next) 960 if (p == sp) { 961 *q = p->pp_next; 962 break; 963 } 964 965 /* Stop keepalive handler. */ 966 if (! spppq) { 967 callout_stop(&keepalive_ch); 968 } 969 970 for (i = 0; i < IDX_COUNT; i++) { 971 callout_stop(&sp->ch[i]); 972 } 973 callout_stop(&sp->pap_my_to_ch); 974 975 /* free authentication info */ 976 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 977 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 978 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 979 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 980 981 #if 0 /* done in if_detach() */ 982 if_free_sadl(ifp); 983 #endif 984 } 985 986 /* 987 * Flush the interface output queue. 988 */ 989 void 990 sppp_flush(struct ifnet *ifp) 991 { 992 struct sppp *sp = (struct sppp *) ifp; 993 994 IFQ_PURGE(&sp->pp_if.if_snd); 995 IF_PURGE(&sp->pp_fastq); 996 IF_PURGE(&sp->pp_cpq); 997 } 998 999 /* 1000 * Check if the output queue is empty. 1001 */ 1002 int 1003 sppp_isempty(struct ifnet *ifp) 1004 { 1005 struct sppp *sp = (struct sppp *) ifp; 1006 int empty, s; 1007 1008 s = splnet(); 1009 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 1010 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 1011 splx(s); 1012 return (empty); 1013 } 1014 1015 /* 1016 * Get next packet to send. 1017 */ 1018 struct mbuf * 1019 sppp_dequeue(struct ifnet *ifp) 1020 { 1021 struct sppp *sp = (struct sppp *) ifp; 1022 struct mbuf *m; 1023 int s; 1024 1025 s = splnet(); 1026 /* 1027 * Process only the control protocol queue until we have at 1028 * least one NCP open. 1029 * 1030 * Do always serve all three queues in Cisco mode. 1031 */ 1032 IF_DEQUEUE(&sp->pp_cpq, m); 1033 if (m == NULL && 1034 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1035 IF_DEQUEUE(&sp->pp_fastq, m); 1036 if (m == NULL) 1037 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1038 } 1039 splx(s); 1040 return m; 1041 } 1042 1043 /* 1044 * Process an ioctl request. Called on low priority level. 1045 */ 1046 int 1047 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1048 { 1049 struct ifreq *ifr = (struct ifreq *) data; 1050 struct sppp *sp = (struct sppp *) ifp; 1051 int s, error=0, going_up, going_down, newmode; 1052 1053 s = splnet(); 1054 switch (cmd) { 1055 case SIOCAIFADDR: 1056 case SIOCSIFDSTADDR: 1057 break; 1058 1059 case SIOCSIFADDR: 1060 if_up(ifp); 1061 /* fall through... */ 1062 1063 case SIOCSIFFLAGS: 1064 going_up = ifp->if_flags & IFF_UP && 1065 (ifp->if_flags & IFF_RUNNING) == 0; 1066 going_down = (ifp->if_flags & IFF_UP) == 0 && 1067 ifp->if_flags & IFF_RUNNING; 1068 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1069 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1070 /* sanity */ 1071 newmode = IFF_PASSIVE; 1072 ifp->if_flags &= ~IFF_AUTO; 1073 } 1074 1075 if (going_up || going_down) 1076 lcp.Close(sp); 1077 if (going_up && newmode == 0) { 1078 /* neither auto-dial nor passive */ 1079 ifp->if_flags |= IFF_RUNNING; 1080 if (!(sp->pp_flags & PP_CISCO)) 1081 lcp.Open(sp); 1082 } else if (going_down) { 1083 sppp_flush(ifp); 1084 ifp->if_flags &= ~IFF_RUNNING; 1085 } 1086 1087 break; 1088 1089 #ifdef SIOCSIFMTU 1090 #ifndef ifr_mtu 1091 #define ifr_mtu ifr_metric 1092 #endif 1093 case SIOCSIFMTU: 1094 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) { 1095 error = EINVAL; 1096 break; 1097 } 1098 1099 ifp->if_mtu = ifr->ifr_mtu; 1100 break; 1101 #endif 1102 #ifdef SLIOCSETMTU 1103 case SLIOCSETMTU: 1104 if (*(short *)data < 128 || *(short *)data > sp->lcp.their_mru) 1105 { 1106 error = EINVAL; 1107 break; 1108 } 1109 1110 ifp->if_mtu = *(short *)data; 1111 break; 1112 #endif 1113 #ifdef SIOCGIFMTU 1114 case SIOCGIFMTU: 1115 ifr->ifr_mtu = ifp->if_mtu; 1116 break; 1117 #endif 1118 #ifdef SLIOCGETMTU 1119 case SLIOCGETMTU: 1120 *(short *)data = ifp->if_mtu; 1121 break; 1122 #endif 1123 case SIOCADDMULTI: 1124 case SIOCDELMULTI: 1125 break; 1126 1127 case SPPPSETAUTHCFG: 1128 case SPPPGETAUTHCFG: 1129 case SPPPSETLCPCFG: 1130 case SPPPGETLCPCFG: 1131 case SPPPSETIDLETO: 1132 case SPPPSETAUTHFAILURE: 1133 case SPPPGETAUTHFAILURES: 1134 case SPPPSETDNSOPTS: 1135 case SPPPSETKEEPALIVE: 1136 { 1137 struct proc *p = curproc; /* XXX */ 1138 1139 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1140 break; 1141 } 1142 /* FALLTHROUGH */ 1143 case SPPPGETSTATUS: 1144 case SPPPGETSTATUSNCP: 1145 case SPPPGETIDLETO: 1146 case SPPPGETDNSOPTS: 1147 case SPPPGETDNSADDRS: 1148 case SPPPGETKEEPALIVE: 1149 error = sppp_params(sp, cmd, data); 1150 break; 1151 1152 default: 1153 error = ENOTTY; 1154 } 1155 splx(s); 1156 return (error); 1157 } 1158 1159 1160 /* 1161 * Cisco framing implementation. 1162 */ 1163 1164 /* 1165 * Handle incoming Cisco keepalive protocol packets. 1166 */ 1167 static void 1168 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1169 { 1170 STDDCL; 1171 struct cisco_packet *h; 1172 #ifdef INET 1173 u_int32_t me, mymask; 1174 #endif 1175 1176 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1177 if (debug) 1178 log(LOG_DEBUG, 1179 "%s: cisco invalid packet length: %d bytes\n", 1180 ifp->if_xname, m->m_pkthdr.len); 1181 return; 1182 } 1183 h = mtod(m, struct cisco_packet *); 1184 if (debug) 1185 log(LOG_DEBUG, 1186 "%s: cisco input: %d bytes " 1187 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1188 ifp->if_xname, m->m_pkthdr.len, 1189 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1190 (u_int)h->time0, (u_int)h->time1); 1191 switch (ntohl(h->type)) { 1192 default: 1193 if (debug) 1194 addlog("%s: cisco unknown packet type: 0x%x\n", 1195 ifp->if_xname, ntohl(h->type)); 1196 break; 1197 case CISCO_ADDR_REPLY: 1198 /* Reply on address request, ignore */ 1199 break; 1200 case CISCO_KEEPALIVE_REQ: 1201 sp->pp_alivecnt = 0; 1202 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1203 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1204 /* Local and remote sequence numbers are equal. 1205 * Probably, the line is in loopback mode. */ 1206 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1207 printf ("%s: loopback\n", 1208 ifp->if_xname); 1209 sp->pp_loopcnt = 0; 1210 if (ifp->if_flags & IFF_UP) { 1211 if_down(ifp); 1212 IF_PURGE(&sp->pp_cpq); 1213 } 1214 } 1215 ++sp->pp_loopcnt; 1216 1217 /* Generate new local sequence number */ 1218 sp->pp_seq[IDX_LCP] = arc4random(); 1219 break; 1220 } 1221 sp->pp_loopcnt = 0; 1222 if (! (ifp->if_flags & IFF_UP) && 1223 (ifp->if_flags & IFF_RUNNING)) { 1224 if_up(ifp); 1225 } 1226 break; 1227 case CISCO_ADDR_REQ: 1228 #ifdef INET 1229 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1230 if (me != 0L) 1231 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1232 #endif 1233 break; 1234 } 1235 } 1236 1237 /* 1238 * Send Cisco keepalive packet. 1239 */ 1240 static void 1241 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1242 { 1243 STDDCL; 1244 struct ppp_header *h; 1245 struct cisco_packet *ch; 1246 struct mbuf *m; 1247 u_int32_t t = (time.tv_sec - boottime.tv_sec) * 1000; 1248 1249 MGETHDR(m, M_DONTWAIT, MT_DATA); 1250 if (! m) 1251 return; 1252 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1253 m->m_pkthdr.rcvif = 0; 1254 1255 h = mtod(m, struct ppp_header *); 1256 h->address = CISCO_MULTICAST; 1257 h->control = 0; 1258 h->protocol = htons(CISCO_KEEPALIVE); 1259 1260 ch = (struct cisco_packet *)(h + 1); 1261 ch->type = htonl(type); 1262 ch->par1 = htonl(par1); 1263 ch->par2 = htonl(par2); 1264 ch->rel = -1; 1265 1266 ch->time0 = htons((u_short)(t >> 16)); 1267 ch->time1 = htons((u_short) t); 1268 1269 if (debug) 1270 log(LOG_DEBUG, 1271 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1272 ifp->if_xname, ntohl(ch->type), ch->par1, 1273 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1274 (u_int)ch->time1); 1275 1276 if (IF_QFULL(&sp->pp_cpq)) { 1277 IF_DROP(&sp->pp_fastq); 1278 IF_DROP(&ifp->if_snd); 1279 m_freem(m); 1280 ++ifp->if_oerrors; 1281 return; 1282 } else 1283 IF_ENQUEUE(&sp->pp_cpq, m); 1284 if (! (ifp->if_flags & IFF_OACTIVE)) 1285 (*ifp->if_start)(ifp); 1286 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1287 } 1288 1289 /* 1290 * PPP protocol implementation. 1291 */ 1292 1293 /* 1294 * Send PPP control protocol packet. 1295 */ 1296 static void 1297 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1298 u_char ident, u_short len, void *data) 1299 { 1300 STDDCL; 1301 struct lcp_header *lh; 1302 struct mbuf *m; 1303 size_t pkthdrlen; 1304 1305 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1306 1307 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1308 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1309 MGETHDR(m, M_DONTWAIT, MT_DATA); 1310 if (! m) 1311 return; 1312 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1313 m->m_pkthdr.rcvif = 0; 1314 1315 if (sp->pp_flags & PP_NOFRAMING) { 1316 *mtod(m, u_int16_t *) = htons(proto); 1317 lh = (struct lcp_header *)(mtod(m, u_int8_t *) + 2); 1318 } else { 1319 struct ppp_header *h; 1320 h = mtod(m, struct ppp_header *); 1321 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1322 h->control = PPP_UI; /* Unnumbered Info */ 1323 h->protocol = htons(proto); /* Link Control Protocol */ 1324 lh = (struct lcp_header *)(h + 1); 1325 } 1326 lh->type = type; 1327 lh->ident = ident; 1328 lh->len = htons(LCP_HEADER_LEN + len); 1329 if (len) 1330 bcopy (data, lh + 1, len); 1331 1332 if (debug) { 1333 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1334 ifp->if_xname, 1335 sppp_proto_name(proto), 1336 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1337 if (len) 1338 sppp_print_bytes((u_char *)(lh + 1), len); 1339 addlog(">\n"); 1340 } 1341 if (IF_QFULL(&sp->pp_cpq)) { 1342 IF_DROP(&sp->pp_fastq); 1343 IF_DROP(&ifp->if_snd); 1344 m_freem(m); 1345 ++ifp->if_oerrors; 1346 return; 1347 } else 1348 IF_ENQUEUE(&sp->pp_cpq, m); 1349 if (! (ifp->if_flags & IFF_OACTIVE)) 1350 (*ifp->if_start)(ifp); 1351 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1352 } 1353 1354 /* 1355 * Handle incoming PPP control protocol packets. 1356 */ 1357 static void 1358 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1359 { 1360 STDDCL; 1361 struct lcp_header *h; 1362 int len = m->m_pkthdr.len; 1363 int rv; 1364 u_char *p; 1365 u_int32_t u32; 1366 1367 if (len < 4) { 1368 if (debug) 1369 log(LOG_DEBUG, 1370 "%s: %s invalid packet length: %d bytes\n", 1371 ifp->if_xname, cp->name, len); 1372 return; 1373 } 1374 h = mtod(m, struct lcp_header *); 1375 if (debug) { 1376 log(LOG_DEBUG, 1377 "%s: %s input(%s): <%s id=0x%x len=%d", 1378 ifp->if_xname, cp->name, 1379 sppp_state_name(sp->state[cp->protoidx]), 1380 sppp_cp_type_name(h->type), h->ident, ntohs(h->len)); 1381 if (len > 4) 1382 sppp_print_bytes((u_char *)(h + 1), len - 4); 1383 addlog(">\n"); 1384 } 1385 if (len > ntohs(h->len)) 1386 len = ntohs(h->len); 1387 p = (u_char *)(h + 1); 1388 switch (h->type) { 1389 case CONF_REQ: 1390 if (len < 4) { 1391 if (debug) 1392 addlog("%s: %s invalid conf-req length %d\n", 1393 ifp->if_xname, cp->name, 1394 len); 1395 ++ifp->if_ierrors; 1396 break; 1397 } 1398 /* handle states where RCR doesn't get a SCA/SCN */ 1399 switch (sp->state[cp->protoidx]) { 1400 case STATE_CLOSING: 1401 case STATE_STOPPING: 1402 return; 1403 case STATE_CLOSED: 1404 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1405 0, 0); 1406 return; 1407 } 1408 rv = (cp->RCR)(sp, h, len); 1409 switch (sp->state[cp->protoidx]) { 1410 case STATE_OPENED: 1411 (cp->tld)(sp); 1412 (cp->scr)(sp); 1413 /* fall through... */ 1414 case STATE_ACK_SENT: 1415 case STATE_REQ_SENT: 1416 sppp_cp_change_state(cp, sp, rv? 1417 STATE_ACK_SENT: STATE_REQ_SENT); 1418 break; 1419 case STATE_STOPPED: 1420 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1421 (cp->scr)(sp); 1422 sppp_cp_change_state(cp, sp, rv? 1423 STATE_ACK_SENT: STATE_REQ_SENT); 1424 break; 1425 case STATE_ACK_RCVD: 1426 if (rv) { 1427 sppp_cp_change_state(cp, sp, STATE_OPENED); 1428 if (debug) 1429 log(LOG_DEBUG, "%s: %s tlu\n", 1430 ifp->if_xname, 1431 cp->name); 1432 (cp->tlu)(sp); 1433 } else 1434 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1435 break; 1436 default: 1437 printf("%s: %s illegal %s in state %s\n", 1438 ifp->if_xname, cp->name, 1439 sppp_cp_type_name(h->type), 1440 sppp_state_name(sp->state[cp->protoidx])); 1441 ++ifp->if_ierrors; 1442 } 1443 break; 1444 case CONF_ACK: 1445 if (h->ident != sp->confid[cp->protoidx]) { 1446 if (debug) 1447 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1448 ifp->if_xname, cp->name, 1449 h->ident, sp->confid[cp->protoidx]); 1450 ++ifp->if_ierrors; 1451 break; 1452 } 1453 switch (sp->state[cp->protoidx]) { 1454 case STATE_CLOSED: 1455 case STATE_STOPPED: 1456 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1457 break; 1458 case STATE_CLOSING: 1459 case STATE_STOPPING: 1460 break; 1461 case STATE_REQ_SENT: 1462 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1463 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1464 break; 1465 case STATE_OPENED: 1466 (cp->tld)(sp); 1467 /* fall through */ 1468 case STATE_ACK_RCVD: 1469 (cp->scr)(sp); 1470 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1471 break; 1472 case STATE_ACK_SENT: 1473 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1474 sppp_cp_change_state(cp, sp, STATE_OPENED); 1475 if (debug) 1476 log(LOG_DEBUG, "%s: %s tlu\n", 1477 ifp->if_xname, cp->name); 1478 (cp->tlu)(sp); 1479 break; 1480 default: 1481 printf("%s: %s illegal %s in state %s\n", 1482 ifp->if_xname, cp->name, 1483 sppp_cp_type_name(h->type), 1484 sppp_state_name(sp->state[cp->protoidx])); 1485 ++ifp->if_ierrors; 1486 } 1487 break; 1488 case CONF_NAK: 1489 case CONF_REJ: 1490 if (h->ident != sp->confid[cp->protoidx]) { 1491 if (debug) 1492 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1493 ifp->if_xname, cp->name, 1494 h->ident, sp->confid[cp->protoidx]); 1495 ++ifp->if_ierrors; 1496 break; 1497 } 1498 if (h->type == CONF_NAK) 1499 (cp->RCN_nak)(sp, h, len); 1500 else /* CONF_REJ */ 1501 (cp->RCN_rej)(sp, h, len); 1502 1503 switch (sp->state[cp->protoidx]) { 1504 case STATE_CLOSED: 1505 case STATE_STOPPED: 1506 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1507 break; 1508 case STATE_REQ_SENT: 1509 case STATE_ACK_SENT: 1510 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1511 (cp->scr)(sp); 1512 break; 1513 case STATE_OPENED: 1514 (cp->tld)(sp); 1515 /* fall through */ 1516 case STATE_ACK_RCVD: 1517 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1518 (cp->scr)(sp); 1519 break; 1520 case STATE_CLOSING: 1521 case STATE_STOPPING: 1522 break; 1523 default: 1524 printf("%s: %s illegal %s in state %s\n", 1525 ifp->if_xname, cp->name, 1526 sppp_cp_type_name(h->type), 1527 sppp_state_name(sp->state[cp->protoidx])); 1528 ++ifp->if_ierrors; 1529 } 1530 break; 1531 1532 case TERM_REQ: 1533 switch (sp->state[cp->protoidx]) { 1534 case STATE_ACK_RCVD: 1535 case STATE_ACK_SENT: 1536 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1537 /* fall through */ 1538 case STATE_CLOSED: 1539 case STATE_STOPPED: 1540 case STATE_CLOSING: 1541 case STATE_STOPPING: 1542 case STATE_REQ_SENT: 1543 sta: 1544 /* Send Terminate-Ack packet. */ 1545 if (debug) 1546 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1547 ifp->if_xname, cp->name); 1548 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1549 break; 1550 case STATE_OPENED: 1551 (cp->tld)(sp); 1552 sp->rst_counter[cp->protoidx] = 0; 1553 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1554 goto sta; 1555 default: 1556 printf("%s: %s illegal %s in state %s\n", 1557 ifp->if_xname, cp->name, 1558 sppp_cp_type_name(h->type), 1559 sppp_state_name(sp->state[cp->protoidx])); 1560 ++ifp->if_ierrors; 1561 } 1562 break; 1563 case TERM_ACK: 1564 switch (sp->state[cp->protoidx]) { 1565 case STATE_CLOSED: 1566 case STATE_STOPPED: 1567 case STATE_REQ_SENT: 1568 case STATE_ACK_SENT: 1569 break; 1570 case STATE_CLOSING: 1571 (cp->tlf)(sp); 1572 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1573 sppp_lcp_check_and_close(sp); 1574 break; 1575 case STATE_STOPPING: 1576 (cp->tlf)(sp); 1577 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1578 sppp_lcp_check_and_close(sp); 1579 break; 1580 case STATE_ACK_RCVD: 1581 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1582 break; 1583 case STATE_OPENED: 1584 (cp->tld)(sp); 1585 (cp->scr)(sp); 1586 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1587 break; 1588 default: 1589 printf("%s: %s illegal %s in state %s\n", 1590 ifp->if_xname, cp->name, 1591 sppp_cp_type_name(h->type), 1592 sppp_state_name(sp->state[cp->protoidx])); 1593 ++ifp->if_ierrors; 1594 } 1595 break; 1596 case CODE_REJ: 1597 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1598 log(LOG_INFO, 1599 "%s: %s: ignoring RXJ (%s) for code ?, " 1600 "danger will robinson\n", 1601 ifp->if_xname, cp->name, 1602 sppp_cp_type_name(h->type)); 1603 switch (sp->state[cp->protoidx]) { 1604 case STATE_CLOSED: 1605 case STATE_STOPPED: 1606 case STATE_REQ_SENT: 1607 case STATE_ACK_SENT: 1608 case STATE_CLOSING: 1609 case STATE_STOPPING: 1610 case STATE_OPENED: 1611 break; 1612 case STATE_ACK_RCVD: 1613 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1614 break; 1615 default: 1616 printf("%s: %s illegal %s in state %s\n", 1617 ifp->if_xname, cp->name, 1618 sppp_cp_type_name(h->type), 1619 sppp_state_name(sp->state[cp->protoidx])); 1620 ++ifp->if_ierrors; 1621 } 1622 break; 1623 case PROTO_REJ: 1624 { 1625 int catastrophic; 1626 const struct cp *upper; 1627 int i; 1628 u_int16_t proto; 1629 1630 catastrophic = 0; 1631 upper = NULL; 1632 proto = p[0] << 8 | p[1]; 1633 for (i = 0; i < IDX_COUNT; i++) { 1634 if (cps[i]->proto == proto) { 1635 upper = cps[i]; 1636 break; 1637 } 1638 } 1639 if (upper == NULL) 1640 catastrophic++; 1641 1642 if (debug) 1643 log(LOG_INFO, 1644 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1645 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1646 sppp_cp_type_name(h->type), proto, 1647 upper ? upper->name : "unknown", 1648 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1649 1650 /* 1651 * if we got RXJ+ against conf-req, the peer does not implement 1652 * this particular protocol type. terminate the protocol. 1653 */ 1654 if (upper && !catastrophic) { 1655 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1656 upper->Close(sp); 1657 break; 1658 } 1659 } 1660 1661 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1662 switch (sp->state[cp->protoidx]) { 1663 case STATE_CLOSED: 1664 case STATE_STOPPED: 1665 case STATE_REQ_SENT: 1666 case STATE_ACK_SENT: 1667 case STATE_CLOSING: 1668 case STATE_STOPPING: 1669 case STATE_OPENED: 1670 break; 1671 case STATE_ACK_RCVD: 1672 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1673 break; 1674 default: 1675 printf("%s: %s illegal %s in state %s\n", 1676 ifp->if_xname, cp->name, 1677 sppp_cp_type_name(h->type), 1678 sppp_state_name(sp->state[cp->protoidx])); 1679 ++ifp->if_ierrors; 1680 } 1681 break; 1682 } 1683 case DISC_REQ: 1684 if (cp->proto != PPP_LCP) 1685 goto illegal; 1686 /* Discard the packet. */ 1687 break; 1688 case ECHO_REQ: 1689 if (cp->proto != PPP_LCP) 1690 goto illegal; 1691 if (sp->state[cp->protoidx] != STATE_OPENED) { 1692 if (debug) 1693 addlog("%s: lcp echo req but lcp closed\n", 1694 ifp->if_xname); 1695 ++ifp->if_ierrors; 1696 break; 1697 } 1698 if (len < 8) { 1699 if (debug) 1700 addlog("%s: invalid lcp echo request " 1701 "packet length: %d bytes\n", 1702 ifp->if_xname, len); 1703 break; 1704 } 1705 memcpy(&u32, h + 1, sizeof u32); 1706 if (ntohl(u32) == sp->lcp.magic) { 1707 /* Line loopback mode detected. */ 1708 printf("%s: loopback\n", ifp->if_xname); 1709 if_down(ifp); 1710 IF_PURGE(&sp->pp_cpq); 1711 1712 /* Shut down the PPP link. */ 1713 /* XXX */ 1714 lcp.Down(sp); 1715 lcp.Up(sp); 1716 break; 1717 } 1718 u32 = htonl(sp->lcp.magic); 1719 memcpy(h + 1, &u32, sizeof u32); 1720 if (debug) 1721 addlog("%s: got lcp echo req, sending echo rep\n", 1722 ifp->if_xname); 1723 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1724 h + 1); 1725 break; 1726 case ECHO_REPLY: 1727 if (cp->proto != PPP_LCP) 1728 goto illegal; 1729 if (h->ident != sp->lcp.echoid) { 1730 ++ifp->if_ierrors; 1731 break; 1732 } 1733 if (len < 8) { 1734 if (debug) 1735 addlog("%s: lcp invalid echo reply " 1736 "packet length: %d bytes\n", 1737 ifp->if_xname, len); 1738 break; 1739 } 1740 if (debug) 1741 addlog("%s: lcp got echo rep\n", 1742 ifp->if_xname); 1743 memcpy(&u32, h + 1, sizeof u32); 1744 if (ntohl(u32) != sp->lcp.magic) 1745 sp->pp_alivecnt = 0; 1746 break; 1747 default: 1748 /* Unknown packet type -- send Code-Reject packet. */ 1749 illegal: 1750 if (debug) 1751 addlog("%s: %s send code-rej for 0x%x\n", 1752 ifp->if_xname, cp->name, h->type); 1753 sppp_cp_send(sp, cp->proto, CODE_REJ, 1754 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1755 ++ifp->if_ierrors; 1756 } 1757 } 1758 1759 1760 /* 1761 * The generic part of all Up/Down/Open/Close/TO event handlers. 1762 * Basically, the state transition handling in the automaton. 1763 */ 1764 static void 1765 sppp_up_event(const struct cp *cp, struct sppp *sp) 1766 { 1767 STDDCL; 1768 1769 if (debug) 1770 log(LOG_DEBUG, "%s: %s up(%s)\n", 1771 ifp->if_xname, cp->name, 1772 sppp_state_name(sp->state[cp->protoidx])); 1773 1774 switch (sp->state[cp->protoidx]) { 1775 case STATE_INITIAL: 1776 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1777 break; 1778 case STATE_STARTING: 1779 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1780 (cp->scr)(sp); 1781 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1782 break; 1783 default: 1784 printf("%s: %s illegal up in state %s\n", 1785 ifp->if_xname, cp->name, 1786 sppp_state_name(sp->state[cp->protoidx])); 1787 } 1788 } 1789 1790 static void 1791 sppp_down_event(const struct cp *cp, struct sppp *sp) 1792 { 1793 STDDCL; 1794 1795 if (debug) 1796 log(LOG_DEBUG, "%s: %s down(%s)\n", 1797 ifp->if_xname, cp->name, 1798 sppp_state_name(sp->state[cp->protoidx])); 1799 1800 switch (sp->state[cp->protoidx]) { 1801 case STATE_CLOSED: 1802 case STATE_CLOSING: 1803 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1804 break; 1805 case STATE_STOPPED: 1806 (cp->tls)(sp); 1807 /* fall through */ 1808 case STATE_STOPPING: 1809 case STATE_REQ_SENT: 1810 case STATE_ACK_RCVD: 1811 case STATE_ACK_SENT: 1812 sppp_cp_change_state(cp, sp, STATE_STARTING); 1813 break; 1814 case STATE_OPENED: 1815 (cp->tld)(sp); 1816 sppp_cp_change_state(cp, sp, STATE_STARTING); 1817 break; 1818 default: 1819 printf("%s: %s illegal down in state %s\n", 1820 ifp->if_xname, cp->name, 1821 sppp_state_name(sp->state[cp->protoidx])); 1822 } 1823 } 1824 1825 1826 static void 1827 sppp_open_event(const struct cp *cp, struct sppp *sp) 1828 { 1829 STDDCL; 1830 1831 if (debug) 1832 log(LOG_DEBUG, "%s: %s open(%s)\n", 1833 ifp->if_xname, cp->name, 1834 sppp_state_name(sp->state[cp->protoidx])); 1835 1836 switch (sp->state[cp->protoidx]) { 1837 case STATE_INITIAL: 1838 (cp->tls)(sp); 1839 sppp_cp_change_state(cp, sp, STATE_STARTING); 1840 break; 1841 case STATE_STARTING: 1842 break; 1843 case STATE_CLOSED: 1844 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1845 (cp->scr)(sp); 1846 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1847 break; 1848 case STATE_STOPPED: 1849 case STATE_STOPPING: 1850 case STATE_REQ_SENT: 1851 case STATE_ACK_RCVD: 1852 case STATE_ACK_SENT: 1853 case STATE_OPENED: 1854 break; 1855 case STATE_CLOSING: 1856 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1857 break; 1858 } 1859 } 1860 1861 1862 static void 1863 sppp_close_event(const struct cp *cp, struct sppp *sp) 1864 { 1865 STDDCL; 1866 1867 if (debug) 1868 log(LOG_DEBUG, "%s: %s close(%s)\n", 1869 ifp->if_xname, cp->name, 1870 sppp_state_name(sp->state[cp->protoidx])); 1871 1872 switch (sp->state[cp->protoidx]) { 1873 case STATE_INITIAL: 1874 case STATE_CLOSED: 1875 case STATE_CLOSING: 1876 break; 1877 case STATE_STARTING: 1878 (cp->tlf)(sp); 1879 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1880 break; 1881 case STATE_STOPPED: 1882 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1883 break; 1884 case STATE_STOPPING: 1885 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1886 break; 1887 case STATE_OPENED: 1888 (cp->tld)(sp); 1889 /* fall through */ 1890 case STATE_REQ_SENT: 1891 case STATE_ACK_RCVD: 1892 case STATE_ACK_SENT: 1893 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1894 sppp_cp_send(sp, cp->proto, TERM_REQ, 1895 ++sp->pp_seq[cp->protoidx], 0, 0); 1896 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1897 break; 1898 } 1899 } 1900 1901 static void 1902 sppp_to_event(const struct cp *cp, struct sppp *sp) 1903 { 1904 STDDCL; 1905 int s; 1906 1907 s = splnet(); 1908 if (debug) 1909 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1910 ifp->if_xname, cp->name, 1911 sppp_state_name(sp->state[cp->protoidx]), 1912 sp->rst_counter[cp->protoidx]); 1913 1914 if (--sp->rst_counter[cp->protoidx] < 0) 1915 /* TO- event */ 1916 switch (sp->state[cp->protoidx]) { 1917 case STATE_CLOSING: 1918 (cp->tlf)(sp); 1919 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1920 sppp_lcp_check_and_close(sp); 1921 break; 1922 case STATE_STOPPING: 1923 (cp->tlf)(sp); 1924 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1925 sppp_lcp_check_and_close(sp); 1926 break; 1927 case STATE_REQ_SENT: 1928 case STATE_ACK_RCVD: 1929 case STATE_ACK_SENT: 1930 (cp->tlf)(sp); 1931 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1932 sppp_lcp_check_and_close(sp); 1933 break; 1934 } 1935 else 1936 /* TO+ event */ 1937 switch (sp->state[cp->protoidx]) { 1938 case STATE_CLOSING: 1939 case STATE_STOPPING: 1940 sppp_cp_send(sp, cp->proto, TERM_REQ, 1941 ++sp->pp_seq[cp->protoidx], 0, 0); 1942 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1943 cp->TO, sp); 1944 break; 1945 case STATE_REQ_SENT: 1946 case STATE_ACK_RCVD: 1947 (cp->scr)(sp); 1948 /* sppp_cp_change_state() will restart the timer */ 1949 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1950 break; 1951 case STATE_ACK_SENT: 1952 (cp->scr)(sp); 1953 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1954 cp->TO, sp); 1955 break; 1956 } 1957 1958 splx(s); 1959 } 1960 1961 /* 1962 * Change the state of a control protocol in the state automaton. 1963 * Takes care of starting/stopping the restart timer. 1964 */ 1965 void 1966 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1967 { 1968 sp->state[cp->protoidx] = newstate; 1969 callout_stop(&sp->ch[cp->protoidx]); 1970 switch (newstate) { 1971 case STATE_INITIAL: 1972 case STATE_STARTING: 1973 case STATE_CLOSED: 1974 case STATE_STOPPED: 1975 case STATE_OPENED: 1976 break; 1977 case STATE_CLOSING: 1978 case STATE_STOPPING: 1979 case STATE_REQ_SENT: 1980 case STATE_ACK_RCVD: 1981 case STATE_ACK_SENT: 1982 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1983 cp->TO, sp); 1984 break; 1985 } 1986 } 1987 1988 /* 1989 *--------------------------------------------------------------------------* 1990 * * 1991 * The LCP implementation. * 1992 * * 1993 *--------------------------------------------------------------------------* 1994 */ 1995 static void 1996 sppp_lcp_init(struct sppp *sp) 1997 { 1998 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1999 sp->lcp.magic = 0; 2000 sp->state[IDX_LCP] = STATE_INITIAL; 2001 sp->fail_counter[IDX_LCP] = 0; 2002 sp->pp_seq[IDX_LCP] = 0; 2003 sp->pp_rseq[IDX_LCP] = 0; 2004 sp->lcp.protos = 0; 2005 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 2006 2007 /* 2008 * Initialize counters and timeout values. Note that we don't 2009 * use the 3 seconds suggested in RFC 1661 since we are likely 2010 * running on a fast link. XXX We should probably implement 2011 * the exponential backoff option. Note that these values are 2012 * relevant for all control protocols, not just LCP only. 2013 */ 2014 sp->lcp.timeout = 1 * hz; 2015 sp->lcp.max_terminate = 2; 2016 sp->lcp.max_configure = 10; 2017 sp->lcp.max_failure = 10; 2018 callout_init(&sp->ch[IDX_LCP]); 2019 } 2020 2021 static void 2022 sppp_lcp_up(struct sppp *sp) 2023 { 2024 STDDCL; 2025 2026 /* Initialize activity timestamp: opening a connection is an activity */ 2027 sp->pp_last_receive = sp->pp_last_activity = mono_time.tv_sec; 2028 2029 /* 2030 * If this interface is passive or dial-on-demand, and we are 2031 * still in Initial state, it means we've got an incoming 2032 * call. Activate the interface. 2033 */ 2034 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2035 if (debug) 2036 log(LOG_DEBUG, 2037 "%s: Up event", ifp->if_xname); 2038 ifp->if_flags |= IFF_RUNNING; 2039 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2040 if (debug) 2041 addlog("(incoming call)\n"); 2042 sp->pp_flags |= PP_CALLIN; 2043 lcp.Open(sp); 2044 } else if (debug) 2045 addlog("\n"); 2046 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2047 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2048 ifp->if_flags |= IFF_RUNNING; 2049 lcp.Open(sp); 2050 } 2051 2052 sppp_up_event(&lcp, sp); 2053 } 2054 2055 static void 2056 sppp_lcp_down(struct sppp *sp) 2057 { 2058 STDDCL; 2059 2060 sppp_down_event(&lcp, sp); 2061 2062 /* 2063 * If this is neither a dial-on-demand nor a passive 2064 * interface, simulate an ``ifconfig down'' action, so the 2065 * administrator can force a redial by another ``ifconfig 2066 * up''. XXX For leased line operation, should we immediately 2067 * try to reopen the connection here? 2068 */ 2069 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2070 if (debug) 2071 log(LOG_INFO, 2072 "%s: Down event (carrier loss), taking interface down.\n", 2073 ifp->if_xname); 2074 if_down(ifp); 2075 } else { 2076 if (debug) 2077 log(LOG_DEBUG, 2078 "%s: Down event (carrier loss)\n", 2079 ifp->if_xname); 2080 } 2081 sp->pp_flags &= ~PP_CALLIN; 2082 if (sp->state[IDX_LCP] != STATE_INITIAL) 2083 lcp.Close(sp); 2084 ifp->if_flags &= ~IFF_RUNNING; 2085 } 2086 2087 static void 2088 sppp_lcp_open(struct sppp *sp) 2089 { 2090 /* 2091 * If we are authenticator, negotiate LCP_AUTH 2092 */ 2093 if (sp->hisauth.proto != 0) 2094 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2095 else 2096 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2097 sp->pp_flags &= ~PP_NEEDAUTH; 2098 sppp_open_event(&lcp, sp); 2099 } 2100 2101 static void 2102 sppp_lcp_close(struct sppp *sp) 2103 { 2104 sppp_close_event(&lcp, sp); 2105 } 2106 2107 static void 2108 sppp_lcp_TO(void *cookie) 2109 { 2110 sppp_to_event(&lcp, (struct sppp *)cookie); 2111 } 2112 2113 /* 2114 * Analyze a configure request. Return true if it was agreeable, and 2115 * caused action sca, false if it has been rejected or nak'ed, and 2116 * caused action scn. (The return value is used to make the state 2117 * transition decision in the state automaton.) 2118 */ 2119 static int 2120 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2121 { 2122 STDDCL; 2123 u_char *buf, *r, *p; 2124 int origlen, rlen; 2125 u_int32_t nmagic; 2126 u_short authproto; 2127 2128 len -= 4; 2129 origlen = len; 2130 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2131 if (! buf) 2132 return (0); 2133 2134 if (debug) 2135 log(LOG_DEBUG, "%s: lcp parse opts:", 2136 ifp->if_xname); 2137 2138 /* pass 1: check for things that need to be rejected */ 2139 p = (void *)(h + 1); 2140 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2141 if (debug) 2142 addlog(" %s", sppp_lcp_opt_name(*p)); 2143 switch (*p) { 2144 case LCP_OPT_MAGIC: 2145 /* Magic number. */ 2146 /* fall through, both are same length */ 2147 case LCP_OPT_ASYNC_MAP: 2148 /* Async control character map. */ 2149 if (len >= 6 || p[1] == 6) 2150 continue; 2151 if (debug) 2152 addlog(" [invalid]"); 2153 break; 2154 case LCP_OPT_MRU: 2155 /* Maximum receive unit. */ 2156 if (len >= 4 && p[1] == 4) 2157 continue; 2158 if (debug) 2159 addlog(" [invalid]"); 2160 break; 2161 case LCP_OPT_AUTH_PROTO: 2162 if (len < 4) { 2163 if (debug) 2164 addlog(" [invalid]"); 2165 break; 2166 } 2167 authproto = (p[2] << 8) + p[3]; 2168 if (authproto == PPP_CHAP && p[1] != 5) { 2169 if (debug) 2170 addlog(" [invalid chap len]"); 2171 break; 2172 } 2173 if (sp->myauth.proto == 0) { 2174 /* we are not configured to do auth */ 2175 if (debug) 2176 addlog(" [not configured]"); 2177 break; 2178 } 2179 /* 2180 * Remote want us to authenticate, remember this, 2181 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2182 * up. 2183 */ 2184 sp->pp_flags |= PP_NEEDAUTH; 2185 continue; 2186 default: 2187 /* Others not supported. */ 2188 if (debug) 2189 addlog(" [rej]"); 2190 break; 2191 } 2192 /* Add the option to rejected list. */ 2193 bcopy (p, r, p[1]); 2194 r += p[1]; 2195 rlen += p[1]; 2196 } 2197 if (rlen) { 2198 if (debug) 2199 addlog(" send conf-rej\n"); 2200 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2201 goto end; 2202 } else if (debug) 2203 addlog("\n"); 2204 2205 /* 2206 * pass 2: check for option values that are unacceptable and 2207 * thus require to be nak'ed. 2208 */ 2209 if (debug) 2210 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2211 ifp->if_xname); 2212 2213 p = (void *)(h + 1); 2214 len = origlen; 2215 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2216 if (debug) 2217 addlog(" %s", sppp_lcp_opt_name(*p)); 2218 switch (*p) { 2219 case LCP_OPT_MAGIC: 2220 /* Magic number -- extract. */ 2221 nmagic = (u_int32_t)p[2] << 24 | 2222 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2223 if (nmagic != sp->lcp.magic) { 2224 if (debug) 2225 addlog(" 0x%x", nmagic); 2226 continue; 2227 } 2228 /* 2229 * Local and remote magics equal -- loopback? 2230 */ 2231 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2232 printf ("%s: loopback\n", 2233 ifp->if_xname); 2234 sp->pp_loopcnt = 0; 2235 if (ifp->if_flags & IFF_UP) { 2236 if_down(ifp); 2237 IF_PURGE(&sp->pp_cpq); 2238 /* XXX ? */ 2239 lcp.Down(sp); 2240 lcp.Up(sp); 2241 } 2242 } else if (debug) 2243 addlog(" [glitch]"); 2244 ++sp->pp_loopcnt; 2245 /* 2246 * We negate our magic here, and NAK it. If 2247 * we see it later in an NAK packet, we 2248 * suggest a new one. 2249 */ 2250 nmagic = ~sp->lcp.magic; 2251 /* Gonna NAK it. */ 2252 p[2] = nmagic >> 24; 2253 p[3] = nmagic >> 16; 2254 p[4] = nmagic >> 8; 2255 p[5] = nmagic; 2256 break; 2257 2258 case LCP_OPT_ASYNC_MAP: 2259 /* 2260 * Async control character map -- just ignore it. 2261 * 2262 * Quote from RFC 1662, chapter 6: 2263 * To enable this functionality, synchronous PPP 2264 * implementations MUST always respond to the 2265 * Async-Control-Character-Map Configuration 2266 * Option with the LCP Configure-Ack. However, 2267 * acceptance of the Configuration Option does 2268 * not imply that the synchronous implementation 2269 * will do any ACCM mapping. Instead, all such 2270 * octet mapping will be performed by the 2271 * asynchronous-to-synchronous converter. 2272 */ 2273 continue; 2274 2275 case LCP_OPT_MRU: 2276 /* 2277 * Maximum receive unit. Always agreeable, 2278 * but ignored by now. 2279 */ 2280 sp->lcp.their_mru = p[2] * 256 + p[3]; 2281 if (debug) 2282 addlog(" %ld", sp->lcp.their_mru); 2283 continue; 2284 2285 case LCP_OPT_AUTH_PROTO: 2286 authproto = (p[2] << 8) + p[3]; 2287 if (sp->myauth.proto != authproto) { 2288 /* not agreed, nak */ 2289 if (debug) 2290 addlog(" [mine %s != his %s]", 2291 sppp_proto_name(sp->myauth.proto), 2292 sppp_proto_name(authproto)); 2293 p[2] = sp->myauth.proto >> 8; 2294 p[3] = sp->myauth.proto; 2295 break; 2296 } 2297 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2298 if (debug) 2299 addlog(" [chap not MD5]"); 2300 p[4] = CHAP_MD5; 2301 break; 2302 } 2303 continue; 2304 } 2305 /* Add the option to nak'ed list. */ 2306 bcopy (p, r, p[1]); 2307 r += p[1]; 2308 rlen += p[1]; 2309 } 2310 if (rlen) { 2311 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2312 if (debug) 2313 addlog(" max_failure (%d) exceeded, " 2314 "send conf-rej\n", 2315 sp->lcp.max_failure); 2316 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2317 } else { 2318 if (debug) 2319 addlog(" send conf-nak\n"); 2320 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2321 } 2322 goto end; 2323 } else { 2324 if (debug) 2325 addlog(" send conf-ack\n"); 2326 sp->fail_counter[IDX_LCP] = 0; 2327 sp->pp_loopcnt = 0; 2328 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2329 } 2330 2331 end: 2332 free(buf, M_TEMP); 2333 return (rlen == 0); 2334 } 2335 2336 /* 2337 * Analyze the LCP Configure-Reject option list, and adjust our 2338 * negotiation. 2339 */ 2340 static void 2341 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2342 { 2343 STDDCL; 2344 u_char *buf, *p; 2345 2346 len -= 4; 2347 buf = malloc (len, M_TEMP, M_NOWAIT); 2348 if (!buf) 2349 return; 2350 2351 if (debug) 2352 log(LOG_DEBUG, "%s: lcp rej opts:", 2353 ifp->if_xname); 2354 2355 p = (void *)(h + 1); 2356 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2357 if (debug) 2358 addlog(" %s", sppp_lcp_opt_name(*p)); 2359 switch (*p) { 2360 case LCP_OPT_MAGIC: 2361 /* Magic number -- can't use it, use 0 */ 2362 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2363 sp->lcp.magic = 0; 2364 break; 2365 case LCP_OPT_MRU: 2366 /* 2367 * Should not be rejected anyway, since we only 2368 * negotiate a MRU if explicitly requested by 2369 * peer. 2370 */ 2371 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2372 break; 2373 case LCP_OPT_AUTH_PROTO: 2374 /* 2375 * Peer doesn't want to authenticate himself, 2376 * deny unless this is a dialout call, and 2377 * SPPP_AUTHFLAG_NOCALLOUT is set. 2378 */ 2379 if ((sp->pp_flags & PP_CALLIN) == 0 && 2380 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2381 if (debug) 2382 addlog(" [don't insist on auth " 2383 "for callout]"); 2384 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2385 break; 2386 } 2387 if (debug) 2388 addlog("[access denied]\n"); 2389 lcp.Close(sp); 2390 break; 2391 } 2392 } 2393 if (debug) 2394 addlog("\n"); 2395 free(buf, M_TEMP); 2396 return; 2397 } 2398 2399 /* 2400 * Analyze the LCP Configure-NAK option list, and adjust our 2401 * negotiation. 2402 */ 2403 static void 2404 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2405 { 2406 STDDCL; 2407 u_char *buf, *p; 2408 u_int32_t magic; 2409 2410 len -= 4; 2411 buf = malloc (len, M_TEMP, M_NOWAIT); 2412 if (!buf) 2413 return; 2414 2415 if (debug) 2416 log(LOG_DEBUG, "%s: lcp nak opts:", 2417 ifp->if_xname); 2418 2419 p = (void *)(h + 1); 2420 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2421 if (debug) 2422 addlog(" %s", sppp_lcp_opt_name(*p)); 2423 switch (*p) { 2424 case LCP_OPT_MAGIC: 2425 /* Magic number -- renegotiate */ 2426 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2427 len >= 6 && p[1] == 6) { 2428 magic = (u_int32_t)p[2] << 24 | 2429 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2430 /* 2431 * If the remote magic is our negated one, 2432 * this looks like a loopback problem. 2433 * Suggest a new magic to make sure. 2434 */ 2435 if (magic == ~sp->lcp.magic) { 2436 if (debug) 2437 addlog(" magic glitch"); 2438 sp->lcp.magic = arc4random(); 2439 } else { 2440 sp->lcp.magic = magic; 2441 if (debug) 2442 addlog(" %d", magic); 2443 } 2444 } 2445 break; 2446 case LCP_OPT_MRU: 2447 /* 2448 * Peer wants to advise us to negotiate an MRU. 2449 * Agree on it if it's reasonable, or use 2450 * default otherwise. 2451 */ 2452 if (len >= 4 && p[1] == 4) { 2453 u_int mru = p[2] * 256 + p[3]; 2454 if (debug) 2455 addlog(" %d", mru); 2456 if (mru < PP_MTU || mru > PP_MAX_MRU) 2457 mru = PP_MTU; 2458 sp->lcp.mru = mru; 2459 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2460 } 2461 break; 2462 case LCP_OPT_AUTH_PROTO: 2463 /* 2464 * Peer doesn't like our authentication method, 2465 * deny. 2466 */ 2467 if (debug) 2468 addlog("[access denied]\n"); 2469 lcp.Close(sp); 2470 break; 2471 } 2472 } 2473 if (debug) 2474 addlog("\n"); 2475 free(buf, M_TEMP); 2476 return; 2477 } 2478 2479 static void 2480 sppp_lcp_tlu(struct sppp *sp) 2481 { 2482 STDDCL; 2483 int i; 2484 u_int32_t mask; 2485 2486 /* XXX ? */ 2487 if (! (ifp->if_flags & IFF_UP) && 2488 (ifp->if_flags & IFF_RUNNING)) { 2489 /* Coming out of loopback mode. */ 2490 if_up(ifp); 2491 } 2492 2493 for (i = 0; i < IDX_COUNT; i++) 2494 if ((cps[i])->flags & CP_QUAL) 2495 (cps[i])->Open(sp); 2496 2497 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2498 (sp->pp_flags & PP_NEEDAUTH) != 0) 2499 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2500 else 2501 sp->pp_phase = SPPP_PHASE_NETWORK; 2502 2503 if (debug) 2504 { 2505 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2506 sppp_phase_name(sp->pp_phase)); 2507 } 2508 2509 /* 2510 * Open all authentication protocols. This is even required 2511 * if we already proceeded to network phase, since it might be 2512 * that remote wants us to authenticate, so we might have to 2513 * send a PAP request. Undesired authentication protocols 2514 * don't do anything when they get an Open event. 2515 */ 2516 for (i = 0; i < IDX_COUNT; i++) 2517 if ((cps[i])->flags & CP_AUTH) 2518 (cps[i])->Open(sp); 2519 2520 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2521 /* Notify all NCPs. */ 2522 for (i = 0; i < IDX_COUNT; i++) 2523 if ((cps[i])->flags & CP_NCP) 2524 (cps[i])->Open(sp); 2525 } 2526 2527 /* Send Up events to all started protos. */ 2528 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2529 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2530 (cps[i])->Up(sp); 2531 2532 /* notify low-level driver of state change */ 2533 if (sp->pp_chg) 2534 sp->pp_chg(sp, (int)sp->pp_phase); 2535 2536 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2537 /* if no NCP is starting, close down */ 2538 sppp_lcp_check_and_close(sp); 2539 } 2540 2541 static void 2542 sppp_lcp_tld(struct sppp *sp) 2543 { 2544 STDDCL; 2545 int i; 2546 u_int32_t mask; 2547 2548 sp->pp_phase = SPPP_PHASE_TERMINATE; 2549 2550 if (debug) 2551 { 2552 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2553 sppp_phase_name(sp->pp_phase)); 2554 } 2555 2556 /* 2557 * Take upper layers down. We send the Down event first and 2558 * the Close second to prevent the upper layers from sending 2559 * ``a flurry of terminate-request packets'', as the RFC 2560 * describes it. 2561 */ 2562 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2563 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2564 (cps[i])->Down(sp); 2565 (cps[i])->Close(sp); 2566 } 2567 } 2568 2569 static void 2570 sppp_lcp_tls(struct sppp *sp) 2571 { 2572 STDDCL; 2573 2574 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2575 printf("%s: authentication failed %d times, not retrying again\n", 2576 sp->pp_if.if_xname, sp->pp_auth_failures); 2577 if_down(&sp->pp_if); 2578 return; 2579 } 2580 2581 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2582 2583 if (debug) 2584 { 2585 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2586 sppp_phase_name(sp->pp_phase)); 2587 } 2588 2589 /* Notify lower layer if desired. */ 2590 if (sp->pp_tls) 2591 (sp->pp_tls)(sp); 2592 } 2593 2594 static void 2595 sppp_lcp_tlf(struct sppp *sp) 2596 { 2597 STDDCL; 2598 2599 sp->pp_phase = SPPP_PHASE_DEAD; 2600 2601 if (debug) 2602 { 2603 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2604 sppp_phase_name(sp->pp_phase)); 2605 } 2606 2607 /* Notify lower layer if desired. */ 2608 if (sp->pp_tlf) 2609 (sp->pp_tlf)(sp); 2610 } 2611 2612 static void 2613 sppp_lcp_scr(struct sppp *sp) 2614 { 2615 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2616 int i = 0; 2617 u_short authproto; 2618 2619 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2620 if (! sp->lcp.magic) 2621 sp->lcp.magic = arc4random(); 2622 opt[i++] = LCP_OPT_MAGIC; 2623 opt[i++] = 6; 2624 opt[i++] = sp->lcp.magic >> 24; 2625 opt[i++] = sp->lcp.magic >> 16; 2626 opt[i++] = sp->lcp.magic >> 8; 2627 opt[i++] = sp->lcp.magic; 2628 } 2629 2630 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2631 opt[i++] = LCP_OPT_MRU; 2632 opt[i++] = 4; 2633 opt[i++] = sp->lcp.mru >> 8; 2634 opt[i++] = sp->lcp.mru; 2635 } 2636 2637 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2638 authproto = sp->hisauth.proto; 2639 opt[i++] = LCP_OPT_AUTH_PROTO; 2640 opt[i++] = authproto == PPP_CHAP? 5: 4; 2641 opt[i++] = authproto >> 8; 2642 opt[i++] = authproto; 2643 if (authproto == PPP_CHAP) 2644 opt[i++] = CHAP_MD5; 2645 } 2646 2647 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2648 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2649 } 2650 2651 /* 2652 * Check the open NCPs, return true if at least one NCP is open. 2653 */ 2654 static int 2655 sppp_ncp_check(struct sppp *sp) 2656 { 2657 int i, mask; 2658 2659 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2660 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2661 return 1; 2662 return 0; 2663 } 2664 2665 /* 2666 * Re-check the open NCPs and see if we should terminate the link. 2667 * Called by the NCPs during their tlf action handling. 2668 */ 2669 static void 2670 sppp_lcp_check_and_close(struct sppp *sp) 2671 { 2672 2673 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2674 /* don't bother, we are already going down */ 2675 return; 2676 2677 if (sppp_ncp_check(sp)) 2678 return; 2679 2680 lcp.Close(sp); 2681 } 2682 2683 2684 /* 2685 *--------------------------------------------------------------------------* 2686 * * 2687 * The IPCP implementation. * 2688 * * 2689 *--------------------------------------------------------------------------* 2690 */ 2691 2692 static void 2693 sppp_ipcp_init(struct sppp *sp) 2694 { 2695 sp->ipcp.opts = 0; 2696 sp->ipcp.flags = 0; 2697 sp->state[IDX_IPCP] = STATE_INITIAL; 2698 sp->fail_counter[IDX_IPCP] = 0; 2699 sp->pp_seq[IDX_IPCP] = 0; 2700 sp->pp_rseq[IDX_IPCP] = 0; 2701 callout_init(&sp->ch[IDX_IPCP]); 2702 } 2703 2704 static void 2705 sppp_ipcp_up(struct sppp *sp) 2706 { 2707 sppp_up_event(&ipcp, sp); 2708 } 2709 2710 static void 2711 sppp_ipcp_down(struct sppp *sp) 2712 { 2713 sppp_down_event(&ipcp, sp); 2714 } 2715 2716 static void 2717 sppp_ipcp_open(struct sppp *sp) 2718 { 2719 STDDCL; 2720 u_int32_t myaddr, hisaddr; 2721 2722 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2723 sp->ipcp.req_myaddr = 0; 2724 sp->ipcp.req_hisaddr = 0; 2725 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2726 2727 #ifdef INET 2728 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2729 #else 2730 myaddr = hisaddr = 0; 2731 #endif 2732 /* 2733 * If we don't have his address, this probably means our 2734 * interface doesn't want to talk IP at all. (This could 2735 * be the case if somebody wants to speak only IPX, for 2736 * example.) Don't open IPCP in this case. 2737 */ 2738 if (hisaddr == 0) { 2739 /* XXX this message should go away */ 2740 if (debug) 2741 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2742 ifp->if_xname); 2743 return; 2744 } 2745 2746 if (myaddr == 0) { 2747 /* 2748 * I don't have an assigned address, so i need to 2749 * negotiate my address. 2750 */ 2751 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2752 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2753 } 2754 if (hisaddr == 1) { 2755 /* 2756 * XXX - remove this hack! 2757 * remote has no valid address, we need to get one assigned. 2758 */ 2759 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2760 } 2761 sppp_open_event(&ipcp, sp); 2762 } 2763 2764 static void 2765 sppp_ipcp_close(struct sppp *sp) 2766 { 2767 STDDCL; 2768 2769 sppp_close_event(&ipcp, sp); 2770 #ifdef INET 2771 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2772 /* 2773 * Some address was dynamic, clear it again. 2774 */ 2775 sppp_clear_ip_addrs(sp); 2776 #endif 2777 2778 if (sp->pp_saved_mtu > 0) { 2779 ifp->if_mtu = sp->pp_saved_mtu; 2780 sp->pp_saved_mtu = 0; 2781 if (debug) 2782 log(LOG_DEBUG, 2783 "%s: resetting MTU to %" PRIu64 " bytes\n", 2784 ifp->if_xname, ifp->if_mtu); 2785 } 2786 } 2787 2788 static void 2789 sppp_ipcp_TO(void *cookie) 2790 { 2791 sppp_to_event(&ipcp, (struct sppp *)cookie); 2792 } 2793 2794 /* 2795 * Analyze a configure request. Return true if it was agreeable, and 2796 * caused action sca, false if it has been rejected or nak'ed, and 2797 * caused action scn. (The return value is used to make the state 2798 * transition decision in the state automaton.) 2799 */ 2800 static int 2801 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2802 { 2803 u_char *buf, *r, *p; 2804 struct ifnet *ifp = &sp->pp_if; 2805 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2806 u_int32_t hisaddr, desiredaddr; 2807 2808 len -= 4; 2809 origlen = len; 2810 /* 2811 * Make sure to allocate a buf that can at least hold a 2812 * conf-nak with an `address' option. We might need it below. 2813 */ 2814 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2815 if (! buf) 2816 return (0); 2817 2818 /* pass 1: see if we can recognize them */ 2819 if (debug) 2820 log(LOG_DEBUG, "%s: ipcp parse opts:", 2821 ifp->if_xname); 2822 p = (void *)(h + 1); 2823 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2824 if (debug) 2825 addlog(" %s", sppp_ipcp_opt_name(*p)); 2826 switch (*p) { 2827 #ifdef notyet 2828 case IPCP_OPT_COMPRESSION: 2829 if (len >= 6 && p[1] >= 6) { 2830 /* correctly formed compress option */ 2831 continue; 2832 } 2833 if (debug) 2834 addlog(" [invalid]"); 2835 break; 2836 #endif 2837 case IPCP_OPT_ADDRESS: 2838 if (len >= 6 && p[1] == 6) { 2839 /* correctly formed address option */ 2840 continue; 2841 } 2842 if (debug) 2843 addlog(" [invalid]"); 2844 break; 2845 default: 2846 /* Others not supported. */ 2847 if (debug) 2848 addlog(" [rej]"); 2849 break; 2850 } 2851 /* Add the option to rejected list. */ 2852 bcopy (p, r, p[1]); 2853 r += p[1]; 2854 rlen += p[1]; 2855 } 2856 if (rlen) { 2857 if (debug) 2858 addlog(" send conf-rej\n"); 2859 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2860 goto end; 2861 } else if (debug) 2862 addlog("\n"); 2863 2864 /* pass 2: parse option values */ 2865 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2866 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2867 else 2868 #ifdef INET 2869 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2870 #else 2871 hisaddr = 0; 2872 #endif 2873 if (debug) 2874 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2875 ifp->if_xname); 2876 p = (void *)(h + 1); 2877 len = origlen; 2878 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2879 if (debug) 2880 addlog(" %s", sppp_ipcp_opt_name(*p)); 2881 switch (*p) { 2882 #ifdef notyet 2883 case IPCP_OPT_COMPRESSION: 2884 continue; 2885 #endif 2886 case IPCP_OPT_ADDRESS: 2887 desiredaddr = p[2] << 24 | p[3] << 16 | 2888 p[4] << 8 | p[5]; 2889 if (desiredaddr == hisaddr || 2890 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2891 /* 2892 * Peer's address is same as our value, 2893 * this is agreeable. Gonna conf-ack 2894 * it. 2895 */ 2896 if (debug) 2897 addlog(" %s [ack]", 2898 sppp_dotted_quad(hisaddr)); 2899 /* record that we've seen it already */ 2900 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2901 sp->ipcp.req_hisaddr = desiredaddr; 2902 hisaddr = desiredaddr; 2903 continue; 2904 } 2905 /* 2906 * The address wasn't agreeable. This is either 2907 * he sent us 0.0.0.0, asking to assign him an 2908 * address, or he send us another address not 2909 * matching our value. Either case, we gonna 2910 * conf-nak it with our value. 2911 */ 2912 if (debug) { 2913 if (desiredaddr == 0) 2914 addlog(" [addr requested]"); 2915 else 2916 addlog(" %s [not agreed]", 2917 sppp_dotted_quad(desiredaddr)); 2918 } 2919 2920 p[2] = hisaddr >> 24; 2921 p[3] = hisaddr >> 16; 2922 p[4] = hisaddr >> 8; 2923 p[5] = hisaddr; 2924 break; 2925 } 2926 /* Add the option to nak'ed list. */ 2927 bcopy (p, r, p[1]); 2928 r += p[1]; 2929 rlen += p[1]; 2930 } 2931 2932 /* 2933 * If we are about to conf-ack the request, but haven't seen 2934 * his address so far, gonna conf-nak it instead, with the 2935 * `address' option present and our idea of his address being 2936 * filled in there, to request negotiation of both addresses. 2937 * 2938 * XXX This can result in an endless req - nak loop if peer 2939 * doesn't want to send us his address. Q: What should we do 2940 * about it? XXX A: implement the max-failure counter. 2941 */ 2942 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2943 buf[0] = IPCP_OPT_ADDRESS; 2944 buf[1] = 6; 2945 buf[2] = hisaddr >> 24; 2946 buf[3] = hisaddr >> 16; 2947 buf[4] = hisaddr >> 8; 2948 buf[5] = hisaddr; 2949 rlen = 6; 2950 if (debug) 2951 addlog(" still need hisaddr"); 2952 } 2953 2954 if (rlen) { 2955 if (debug) 2956 addlog(" send conf-nak\n"); 2957 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2958 } else { 2959 if (debug) 2960 addlog(" send conf-ack\n"); 2961 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 2962 } 2963 2964 end: 2965 free(buf, M_TEMP); 2966 return (rlen == 0); 2967 } 2968 2969 /* 2970 * Analyze the IPCP Configure-Reject option list, and adjust our 2971 * negotiation. 2972 */ 2973 static void 2974 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2975 { 2976 u_char *buf, *p; 2977 struct ifnet *ifp = &sp->pp_if; 2978 int debug = ifp->if_flags & IFF_DEBUG; 2979 2980 len -= 4; 2981 buf = malloc (len, M_TEMP, M_NOWAIT); 2982 if (!buf) 2983 return; 2984 2985 if (debug) 2986 log(LOG_DEBUG, "%s: ipcp rej opts:", 2987 ifp->if_xname); 2988 2989 p = (void *)(h + 1); 2990 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2991 if (debug) 2992 addlog(" %s", sppp_ipcp_opt_name(*p)); 2993 switch (*p) { 2994 case IPCP_OPT_ADDRESS: 2995 /* 2996 * Peer doesn't grok address option. This is 2997 * bad. XXX Should we better give up here? 2998 */ 2999 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3000 break; 3001 #ifdef notyet 3002 case IPCP_OPT_COMPRESS: 3003 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3004 break; 3005 #endif 3006 } 3007 } 3008 if (debug) 3009 addlog("\n"); 3010 free(buf, M_TEMP); 3011 return; 3012 } 3013 3014 /* 3015 * Analyze the IPCP Configure-NAK option list, and adjust our 3016 * negotiation. 3017 */ 3018 static void 3019 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3020 { 3021 u_char *p; 3022 struct ifnet *ifp = &sp->pp_if; 3023 int debug = ifp->if_flags & IFF_DEBUG; 3024 u_int32_t wantaddr; 3025 3026 len -= 4; 3027 3028 if (debug) 3029 log(LOG_DEBUG, "%s: ipcp nak opts:", 3030 ifp->if_xname); 3031 3032 p = (void *)(h + 1); 3033 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3034 if (debug) 3035 addlog(" %s", sppp_ipcp_opt_name(*p)); 3036 switch (*p) { 3037 case IPCP_OPT_ADDRESS: 3038 /* 3039 * Peer doesn't like our local IP address. See 3040 * if we can do something for him. We'll drop 3041 * him our address then. 3042 */ 3043 if (len >= 6 && p[1] == 6) { 3044 wantaddr = p[2] << 24 | p[3] << 16 | 3045 p[4] << 8 | p[5]; 3046 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3047 if (debug) 3048 addlog(" [wantaddr %s]", 3049 sppp_dotted_quad(wantaddr)); 3050 /* 3051 * When doing dynamic address assignment, 3052 * we accept his offer. Otherwise, we 3053 * ignore it and thus continue to negotiate 3054 * our already existing value. 3055 */ 3056 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3057 if (debug) 3058 addlog(" [agree]"); 3059 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3060 sp->ipcp.req_myaddr = wantaddr; 3061 } 3062 } 3063 break; 3064 3065 case IPCP_OPT_PRIMDNS: 3066 if (len >= 6 && p[1] == 6) { 3067 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3068 p[4] << 8 | p[5]; 3069 } 3070 break; 3071 3072 case IPCP_OPT_SECDNS: 3073 if (len >= 6 && p[1] == 6) { 3074 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3075 p[4] << 8 | p[5]; 3076 } 3077 break; 3078 #ifdef notyet 3079 case IPCP_OPT_COMPRESS: 3080 /* 3081 * Peer wants different compression parameters. 3082 */ 3083 break; 3084 #endif 3085 } 3086 } 3087 if (debug) 3088 addlog("\n"); 3089 return; 3090 } 3091 3092 static void 3093 sppp_ipcp_tlu(struct sppp *sp) 3094 { 3095 #ifdef INET 3096 /* we are up. Set addresses and notify anyone interested */ 3097 STDDCL; 3098 u_int32_t myaddr, hisaddr; 3099 3100 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3101 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3102 myaddr = sp->ipcp.req_myaddr; 3103 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3104 hisaddr = sp->ipcp.req_hisaddr; 3105 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3106 3107 if (ifp->if_mtu > sp->lcp.their_mru) { 3108 sp->pp_saved_mtu = ifp->if_mtu; 3109 ifp->if_mtu = sp->lcp.their_mru; 3110 if (debug) 3111 log(LOG_DEBUG, 3112 "%s: setting MTU to %" PRIu64 " bytes\n", 3113 ifp->if_xname, ifp->if_mtu); 3114 } 3115 3116 if (sp->pp_con) 3117 sp->pp_con(sp); 3118 #endif 3119 } 3120 3121 static void 3122 sppp_ipcp_tld(struct sppp *sp) 3123 { 3124 } 3125 3126 static void 3127 sppp_ipcp_tls(struct sppp *sp) 3128 { 3129 /* indicate to LCP that it must stay alive */ 3130 sp->lcp.protos |= (1 << IDX_IPCP); 3131 } 3132 3133 static void 3134 sppp_ipcp_tlf(struct sppp *sp) 3135 { 3136 /* we no longer need LCP */ 3137 sp->lcp.protos &= ~(1 << IDX_IPCP); 3138 } 3139 3140 static void 3141 sppp_ipcp_scr(struct sppp *sp) 3142 { 3143 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3144 #ifdef INET 3145 u_int32_t ouraddr; 3146 #endif 3147 int i = 0; 3148 3149 #ifdef notyet 3150 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3151 opt[i++] = IPCP_OPT_COMPRESSION; 3152 opt[i++] = 6; 3153 opt[i++] = 0; /* VJ header compression */ 3154 opt[i++] = 0x2d; /* VJ header compression */ 3155 opt[i++] = max_slot_id; 3156 opt[i++] = comp_slot_id; 3157 } 3158 #endif 3159 3160 #ifdef INET 3161 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3162 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3163 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3164 else 3165 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3166 opt[i++] = IPCP_OPT_ADDRESS; 3167 opt[i++] = 6; 3168 opt[i++] = ouraddr >> 24; 3169 opt[i++] = ouraddr >> 16; 3170 opt[i++] = ouraddr >> 8; 3171 opt[i++] = ouraddr; 3172 } 3173 #endif 3174 3175 if (sp->query_dns & 1) { 3176 opt[i++] = IPCP_OPT_PRIMDNS; 3177 opt[i++] = 6; 3178 opt[i++] = sp->dns_addrs[0] >> 24; 3179 opt[i++] = sp->dns_addrs[0] >> 16; 3180 opt[i++] = sp->dns_addrs[0] >> 8; 3181 opt[i++] = sp->dns_addrs[0]; 3182 } 3183 if (sp->query_dns & 2) { 3184 opt[i++] = IPCP_OPT_SECDNS; 3185 opt[i++] = 6; 3186 opt[i++] = sp->dns_addrs[1] >> 24; 3187 opt[i++] = sp->dns_addrs[1] >> 16; 3188 opt[i++] = sp->dns_addrs[1] >> 8; 3189 opt[i++] = sp->dns_addrs[1]; 3190 } 3191 3192 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3193 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3194 } 3195 3196 3197 /* 3198 *--------------------------------------------------------------------------* 3199 * * 3200 * The IPv6CP implementation. * 3201 * * 3202 *--------------------------------------------------------------------------* 3203 */ 3204 3205 #ifdef INET6 3206 static void 3207 sppp_ipv6cp_init(struct sppp *sp) 3208 { 3209 sp->ipv6cp.opts = 0; 3210 sp->ipv6cp.flags = 0; 3211 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3212 sp->fail_counter[IDX_IPV6CP] = 0; 3213 sp->pp_seq[IDX_IPV6CP] = 0; 3214 sp->pp_rseq[IDX_IPV6CP] = 0; 3215 callout_init(&sp->ch[IDX_IPV6CP]); 3216 } 3217 3218 static void 3219 sppp_ipv6cp_up(struct sppp *sp) 3220 { 3221 sppp_up_event(&ipv6cp, sp); 3222 } 3223 3224 static void 3225 sppp_ipv6cp_down(struct sppp *sp) 3226 { 3227 sppp_down_event(&ipv6cp, sp); 3228 } 3229 3230 static void 3231 sppp_ipv6cp_open(struct sppp *sp) 3232 { 3233 STDDCL; 3234 struct in6_addr myaddr, hisaddr; 3235 3236 #ifdef IPV6CP_MYIFID_DYN 3237 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3238 #else 3239 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3240 #endif 3241 3242 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3243 /* 3244 * If we don't have our address, this probably means our 3245 * interface doesn't want to talk IPv6 at all. (This could 3246 * be the case if somebody wants to speak only IPX, for 3247 * example.) Don't open IPv6CP in this case. 3248 */ 3249 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3250 /* XXX this message should go away */ 3251 if (debug) 3252 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3253 ifp->if_xname); 3254 return; 3255 } 3256 3257 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3258 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3259 sppp_open_event(&ipv6cp, sp); 3260 } 3261 3262 static void 3263 sppp_ipv6cp_close(struct sppp *sp) 3264 { 3265 sppp_close_event(&ipv6cp, sp); 3266 } 3267 3268 static void 3269 sppp_ipv6cp_TO(void *cookie) 3270 { 3271 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3272 } 3273 3274 /* 3275 * Analyze a configure request. Return true if it was agreeable, and 3276 * caused action sca, false if it has been rejected or nak'ed, and 3277 * caused action scn. (The return value is used to make the state 3278 * transition decision in the state automaton.) 3279 */ 3280 static int 3281 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3282 { 3283 u_char *buf, *r, *p; 3284 struct ifnet *ifp = &sp->pp_if; 3285 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3286 struct in6_addr myaddr, desiredaddr, suggestaddr; 3287 int ifidcount; 3288 int type; 3289 int collision, nohisaddr; 3290 3291 len -= 4; 3292 origlen = len; 3293 /* 3294 * Make sure to allocate a buf that can at least hold a 3295 * conf-nak with an `address' option. We might need it below. 3296 */ 3297 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3298 if (! buf) 3299 return (0); 3300 3301 /* pass 1: see if we can recognize them */ 3302 if (debug) 3303 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3304 ifp->if_xname); 3305 p = (void *)(h + 1); 3306 ifidcount = 0; 3307 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3308 if (debug) 3309 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3310 switch (*p) { 3311 case IPV6CP_OPT_IFID: 3312 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3313 /* correctly formed address option */ 3314 ifidcount++; 3315 continue; 3316 } 3317 if (debug) 3318 addlog(" [invalid]"); 3319 break; 3320 #ifdef notyet 3321 case IPV6CP_OPT_COMPRESSION: 3322 if (len >= 4 && p[1] >= 4) { 3323 /* correctly formed compress option */ 3324 continue; 3325 } 3326 if (debug) 3327 addlog(" [invalid]"); 3328 break; 3329 #endif 3330 default: 3331 /* Others not supported. */ 3332 if (debug) 3333 addlog(" [rej]"); 3334 break; 3335 } 3336 /* Add the option to rejected list. */ 3337 bcopy (p, r, p[1]); 3338 r += p[1]; 3339 rlen += p[1]; 3340 } 3341 if (rlen) { 3342 if (debug) 3343 addlog(" send conf-rej\n"); 3344 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3345 goto end; 3346 } else if (debug) 3347 addlog("\n"); 3348 3349 /* pass 2: parse option values */ 3350 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3351 if (debug) 3352 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3353 ifp->if_xname); 3354 p = (void *)(h + 1); 3355 len = origlen; 3356 type = CONF_ACK; 3357 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3358 if (debug) 3359 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3360 switch (*p) { 3361 #ifdef notyet 3362 case IPV6CP_OPT_COMPRESSION: 3363 continue; 3364 #endif 3365 case IPV6CP_OPT_IFID: 3366 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3367 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3368 collision = (memcmp(&desiredaddr.s6_addr[8], 3369 &myaddr.s6_addr[8], 8) == 0); 3370 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3371 3372 desiredaddr.s6_addr16[0] = htons(0xfe80); 3373 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3374 3375 if (!collision && !nohisaddr) { 3376 /* no collision, hisaddr known - Conf-Ack */ 3377 type = CONF_ACK; 3378 3379 if (debug) { 3380 addlog(" %s [%s]", 3381 ip6_sprintf(&desiredaddr), 3382 sppp_cp_type_name(type)); 3383 } 3384 continue; 3385 } 3386 3387 memset(&suggestaddr, 0, sizeof(&suggestaddr)); 3388 if (collision && nohisaddr) { 3389 /* collision, hisaddr unknown - Conf-Rej */ 3390 type = CONF_REJ; 3391 memset(&p[2], 0, 8); 3392 } else { 3393 /* 3394 * - no collision, hisaddr unknown, or 3395 * - collision, hisaddr known 3396 * Conf-Nak, suggest hisaddr 3397 */ 3398 type = CONF_NAK; 3399 sppp_suggest_ip6_addr(sp, &suggestaddr); 3400 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3401 } 3402 if (debug) 3403 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3404 sppp_cp_type_name(type)); 3405 break; 3406 } 3407 /* Add the option to nak'ed list. */ 3408 bcopy (p, r, p[1]); 3409 r += p[1]; 3410 rlen += p[1]; 3411 } 3412 3413 if (rlen == 0 && type == CONF_ACK) { 3414 if (debug) 3415 addlog(" send %s\n", sppp_cp_type_name(type)); 3416 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3417 } else { 3418 #ifdef notdef 3419 if (type == CONF_ACK) 3420 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3421 #endif 3422 3423 if (debug) { 3424 addlog(" send %s suggest %s\n", 3425 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3426 } 3427 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3428 } 3429 3430 end: 3431 free(buf, M_TEMP); 3432 return (rlen == 0); 3433 } 3434 3435 /* 3436 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3437 * negotiation. 3438 */ 3439 static void 3440 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3441 { 3442 u_char *buf, *p; 3443 struct ifnet *ifp = &sp->pp_if; 3444 int debug = ifp->if_flags & IFF_DEBUG; 3445 3446 len -= 4; 3447 buf = malloc (len, M_TEMP, M_NOWAIT); 3448 if (!buf) 3449 return; 3450 3451 if (debug) 3452 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3453 ifp->if_xname); 3454 3455 p = (void *)(h + 1); 3456 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3457 if (debug) 3458 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3459 switch (*p) { 3460 case IPV6CP_OPT_IFID: 3461 /* 3462 * Peer doesn't grok address option. This is 3463 * bad. XXX Should we better give up here? 3464 */ 3465 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3466 break; 3467 #ifdef notyet 3468 case IPV6CP_OPT_COMPRESS: 3469 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3470 break; 3471 #endif 3472 } 3473 } 3474 if (debug) 3475 addlog("\n"); 3476 free(buf, M_TEMP); 3477 return; 3478 } 3479 3480 /* 3481 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3482 * negotiation. 3483 */ 3484 static void 3485 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3486 { 3487 u_char *buf, *p; 3488 struct ifnet *ifp = &sp->pp_if; 3489 int debug = ifp->if_flags & IFF_DEBUG; 3490 struct in6_addr suggestaddr; 3491 3492 len -= 4; 3493 buf = malloc (len, M_TEMP, M_NOWAIT); 3494 if (!buf) 3495 return; 3496 3497 if (debug) 3498 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3499 ifp->if_xname); 3500 3501 p = (void *)(h + 1); 3502 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3503 if (debug) 3504 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3505 switch (*p) { 3506 case IPV6CP_OPT_IFID: 3507 /* 3508 * Peer doesn't like our local ifid. See 3509 * if we can do something for him. We'll drop 3510 * him our address then. 3511 */ 3512 if (len < 10 || p[1] != 10) 3513 break; 3514 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3515 suggestaddr.s6_addr16[0] = htons(0xfe80); 3516 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3517 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3518 3519 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3520 if (debug) 3521 addlog(" [suggestaddr %s]", 3522 ip6_sprintf(&suggestaddr)); 3523 #ifdef IPV6CP_MYIFID_DYN 3524 /* 3525 * When doing dynamic address assignment, 3526 * we accept his offer. 3527 */ 3528 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3529 struct in6_addr lastsuggest; 3530 /* 3531 * If <suggested myaddr from peer> equals to 3532 * <hisaddr we have suggested last time>, 3533 * we have a collision. generate new random 3534 * ifid. 3535 */ 3536 sppp_suggest_ip6_addr(&lastsuggest); 3537 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3538 lastsuggest)) { 3539 if (debug) 3540 addlog(" [random]"); 3541 sppp_gen_ip6_addr(sp, &suggestaddr); 3542 } 3543 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3544 if (debug) 3545 addlog(" [agree]"); 3546 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3547 } 3548 #else 3549 /* 3550 * Since we do not do dynamic address assignment, 3551 * we ignore it and thus continue to negotiate 3552 * our already existing value. This can possibly 3553 * go into infinite request-reject loop. 3554 * 3555 * This is not likely because we normally use 3556 * ifid based on MAC-address. 3557 * If you have no ethernet card on the node, too bad. 3558 * XXX should we use fail_counter? 3559 */ 3560 #endif 3561 break; 3562 #ifdef notyet 3563 case IPV6CP_OPT_COMPRESS: 3564 /* 3565 * Peer wants different compression parameters. 3566 */ 3567 break; 3568 #endif 3569 } 3570 } 3571 if (debug) 3572 addlog("\n"); 3573 free(buf, M_TEMP); 3574 return; 3575 } 3576 3577 static void 3578 sppp_ipv6cp_tlu(struct sppp *sp) 3579 { 3580 /* we are up - notify isdn daemon */ 3581 if (sp->pp_con) 3582 sp->pp_con(sp); 3583 } 3584 3585 static void 3586 sppp_ipv6cp_tld(struct sppp *sp) 3587 { 3588 } 3589 3590 static void 3591 sppp_ipv6cp_tls(struct sppp *sp) 3592 { 3593 /* indicate to LCP that it must stay alive */ 3594 sp->lcp.protos |= (1 << IDX_IPV6CP); 3595 } 3596 3597 static void 3598 sppp_ipv6cp_tlf(struct sppp *sp) 3599 { 3600 /* we no longer need LCP */ 3601 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3602 } 3603 3604 static void 3605 sppp_ipv6cp_scr(struct sppp *sp) 3606 { 3607 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3608 struct in6_addr ouraddr; 3609 int i = 0; 3610 3611 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3612 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3613 opt[i++] = IPV6CP_OPT_IFID; 3614 opt[i++] = 10; 3615 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3616 i += 8; 3617 } 3618 3619 #ifdef notyet 3620 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3621 opt[i++] = IPV6CP_OPT_COMPRESSION; 3622 opt[i++] = 4; 3623 opt[i++] = 0; /* TBD */ 3624 opt[i++] = 0; /* TBD */ 3625 /* variable length data may follow */ 3626 } 3627 #endif 3628 3629 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3630 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3631 } 3632 #else /*INET6*/ 3633 static void sppp_ipv6cp_init(struct sppp *sp) 3634 { 3635 } 3636 3637 static void sppp_ipv6cp_up(struct sppp *sp) 3638 { 3639 } 3640 3641 static void sppp_ipv6cp_down(struct sppp *sp) 3642 { 3643 } 3644 3645 3646 static void sppp_ipv6cp_open(struct sppp *sp) 3647 { 3648 } 3649 3650 static void sppp_ipv6cp_close(struct sppp *sp) 3651 { 3652 } 3653 3654 static void sppp_ipv6cp_TO(void *sp) 3655 { 3656 } 3657 3658 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3659 { 3660 return 0; 3661 } 3662 3663 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3664 { 3665 } 3666 3667 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3668 { 3669 } 3670 3671 static void sppp_ipv6cp_tlu(struct sppp *sp) 3672 { 3673 } 3674 3675 static void sppp_ipv6cp_tld(struct sppp *sp) 3676 { 3677 } 3678 3679 static void sppp_ipv6cp_tls(struct sppp *sp) 3680 { 3681 } 3682 3683 static void sppp_ipv6cp_tlf(struct sppp *sp) 3684 { 3685 } 3686 3687 static void sppp_ipv6cp_scr(struct sppp *sp) 3688 { 3689 } 3690 #endif /*INET6*/ 3691 3692 3693 /* 3694 *--------------------------------------------------------------------------* 3695 * * 3696 * The CHAP implementation. * 3697 * * 3698 *--------------------------------------------------------------------------* 3699 */ 3700 3701 /* 3702 * The authentication protocols don't employ a full-fledged state machine as 3703 * the control protocols do, since they do have Open and Close events, but 3704 * not Up and Down, nor are they explicitly terminated. Also, use of the 3705 * authentication protocols may be different in both directions (this makes 3706 * sense, think of a machine that never accepts incoming calls but only 3707 * calls out, it doesn't require the called party to authenticate itself). 3708 * 3709 * Our state machine for the local authentication protocol (we are requesting 3710 * the peer to authenticate) looks like: 3711 * 3712 * RCA- 3713 * +--------------------------------------------+ 3714 * V scn,tld| 3715 * +--------+ Close +---------+ RCA+ 3716 * | |<----------------------------------| |------+ 3717 * +--->| Closed | TO* | Opened | sca | 3718 * | | |-----+ +-------| |<-----+ 3719 * | +--------+ irc | | +---------+ 3720 * | ^ | | ^ 3721 * | | | | | 3722 * | | | | | 3723 * | TO-| | | | 3724 * | |tld TO+ V | | 3725 * | | +------->+ | | 3726 * | | | | | | 3727 * | +--------+ V | | 3728 * | | |<----+<--------------------+ | 3729 * | | Req- | scr | 3730 * | | Sent | | 3731 * | | | | 3732 * | +--------+ | 3733 * | RCA- | | RCA+ | 3734 * +------+ +------------------------------------------+ 3735 * scn,tld sca,irc,ict,tlu 3736 * 3737 * 3738 * with: 3739 * 3740 * Open: LCP reached authentication phase 3741 * Close: LCP reached terminate phase 3742 * 3743 * RCA+: received reply (pap-req, chap-response), acceptable 3744 * RCN: received reply (pap-req, chap-response), not acceptable 3745 * TO+: timeout with restart counter >= 0 3746 * TO-: timeout with restart counter < 0 3747 * TO*: reschedule timeout for CHAP 3748 * 3749 * scr: send request packet (none for PAP, chap-challenge) 3750 * sca: send ack packet (pap-ack, chap-success) 3751 * scn: send nak packet (pap-nak, chap-failure) 3752 * ict: initialize re-challenge timer (CHAP only) 3753 * 3754 * tlu: this-layer-up, LCP reaches network phase 3755 * tld: this-layer-down, LCP enters terminate phase 3756 * 3757 * Note that in CHAP mode, after sending a new challenge, while the state 3758 * automaton falls back into Req-Sent state, it doesn't signal a tld 3759 * event to LCP, so LCP remains in network phase. Only after not getting 3760 * any response (or after getting an unacceptable response), CHAP closes, 3761 * causing LCP to enter terminate phase. 3762 * 3763 * With PAP, there is no initial request that can be sent. The peer is 3764 * expected to send one based on the successful negotiation of PAP as 3765 * the authentication protocol during the LCP option negotiation. 3766 * 3767 * Incoming authentication protocol requests (remote requests 3768 * authentication, we are peer) don't employ a state machine at all, 3769 * they are simply answered. Some peers [Ascend P50 firmware rev 3770 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3771 * still in authentication phase (thereby violating the standard that 3772 * demands that these NCP packets are to be discarded), so we keep 3773 * track of the peer demanding us to authenticate, and only proceed to 3774 * phase network once we've seen a positive acknowledge for the 3775 * authentication. 3776 */ 3777 3778 /* 3779 * Handle incoming CHAP packets. 3780 */ 3781 void 3782 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3783 { 3784 STDDCL; 3785 struct lcp_header *h; 3786 int len, x; 3787 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3788 int value_len, name_len; 3789 MD5_CTX ctx; 3790 3791 len = m->m_pkthdr.len; 3792 if (len < 4) { 3793 if (debug) 3794 log(LOG_DEBUG, 3795 "%s: chap invalid packet length: %d bytes\n", 3796 ifp->if_xname, len); 3797 return; 3798 } 3799 h = mtod(m, struct lcp_header *); 3800 if (len > ntohs(h->len)) 3801 len = ntohs(h->len); 3802 3803 switch (h->type) { 3804 /* challenge, failure and success are his authproto */ 3805 case CHAP_CHALLENGE: 3806 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3807 /* can't do anything usefull */ 3808 sp->pp_auth_failures++; 3809 printf("%s: chap input without my name and my secret being set\n", 3810 ifp->if_xname); 3811 break; 3812 } 3813 value = 1 + (u_char *)(h + 1); 3814 value_len = value[-1]; 3815 name = value + value_len; 3816 name_len = len - value_len - 5; 3817 if (name_len < 0) { 3818 if (debug) { 3819 log(LOG_DEBUG, 3820 "%s: chap corrupted challenge " 3821 "<%s id=0x%x len=%d", 3822 ifp->if_xname, 3823 sppp_auth_type_name(PPP_CHAP, h->type), 3824 h->ident, ntohs(h->len)); 3825 if (len > 4) 3826 sppp_print_bytes((u_char *)(h + 1), 3827 len - 4); 3828 addlog(">\n"); 3829 } 3830 break; 3831 } 3832 3833 if (debug) { 3834 log(LOG_DEBUG, 3835 "%s: chap input <%s id=0x%x len=%d name=", 3836 ifp->if_xname, 3837 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3838 ntohs(h->len)); 3839 sppp_print_string((char *) name, name_len); 3840 addlog(" value-size=%d value=", value_len); 3841 sppp_print_bytes(value, value_len); 3842 addlog(">\n"); 3843 } 3844 3845 /* Compute reply value. */ 3846 MD5Init(&ctx); 3847 MD5Update(&ctx, &h->ident, 1); 3848 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3849 MD5Update(&ctx, value, value_len); 3850 MD5Final(digest, &ctx); 3851 dsize = sizeof digest; 3852 3853 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3854 sizeof dsize, (const char *)&dsize, 3855 sizeof digest, digest, 3856 sp->myauth.name_len, 3857 sp->myauth.name, 3858 0); 3859 break; 3860 3861 case CHAP_SUCCESS: 3862 if (debug) { 3863 log(LOG_DEBUG, "%s: chap success", 3864 ifp->if_xname); 3865 if (len > 4) { 3866 addlog(": "); 3867 sppp_print_string((char *)(h + 1), len - 4); 3868 } 3869 addlog("\n"); 3870 } 3871 x = splnet(); 3872 sp->pp_auth_failures = 0; 3873 sp->pp_flags &= ~PP_NEEDAUTH; 3874 if (sp->myauth.proto == PPP_CHAP && 3875 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3876 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3877 /* 3878 * We are authenticator for CHAP but didn't 3879 * complete yet. Leave it to tlu to proceed 3880 * to network phase. 3881 */ 3882 splx(x); 3883 break; 3884 } 3885 splx(x); 3886 sppp_phase_network(sp); 3887 break; 3888 3889 case CHAP_FAILURE: 3890 x = splnet(); 3891 sp->pp_auth_failures++; 3892 splx(x); 3893 if (debug) { 3894 log(LOG_INFO, "%s: chap failure", 3895 ifp->if_xname); 3896 if (len > 4) { 3897 addlog(": "); 3898 sppp_print_string((char *)(h + 1), len - 4); 3899 } 3900 addlog("\n"); 3901 } else 3902 log(LOG_INFO, "%s: chap failure\n", 3903 ifp->if_xname); 3904 /* await LCP shutdown by authenticator */ 3905 break; 3906 3907 /* response is my authproto */ 3908 case CHAP_RESPONSE: 3909 if (sp->hisauth.secret == NULL) { 3910 /* can't do anything usefull */ 3911 printf("%s: chap input without his secret being set\n", 3912 ifp->if_xname); 3913 break; 3914 } 3915 value = 1 + (u_char *)(h + 1); 3916 value_len = value[-1]; 3917 name = value + value_len; 3918 name_len = len - value_len - 5; 3919 if (name_len < 0) { 3920 if (debug) { 3921 log(LOG_DEBUG, 3922 "%s: chap corrupted response " 3923 "<%s id=0x%x len=%d", 3924 ifp->if_xname, 3925 sppp_auth_type_name(PPP_CHAP, h->type), 3926 h->ident, ntohs(h->len)); 3927 if (len > 4) 3928 sppp_print_bytes((u_char *)(h + 1), 3929 len - 4); 3930 addlog(">\n"); 3931 } 3932 break; 3933 } 3934 if (h->ident != sp->confid[IDX_CHAP]) { 3935 if (debug) 3936 log(LOG_DEBUG, 3937 "%s: chap dropping response for old ID " 3938 "(got %d, expected %d)\n", 3939 ifp->if_xname, 3940 h->ident, sp->confid[IDX_CHAP]); 3941 break; 3942 } 3943 if (sp->hisauth.name != NULL && 3944 (name_len != sp->hisauth.name_len 3945 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 3946 log(LOG_INFO, "%s: chap response, his name ", 3947 ifp->if_xname); 3948 sppp_print_string(name, name_len); 3949 addlog(" != expected "); 3950 sppp_print_string(sp->hisauth.name, 3951 sp->hisauth.name_len); 3952 addlog("\n"); 3953 goto chap_failure; 3954 } 3955 if (debug) { 3956 log(LOG_DEBUG, "%s: chap input(%s) " 3957 "<%s id=0x%x len=%d name=", 3958 ifp->if_xname, 3959 sppp_state_name(sp->state[IDX_CHAP]), 3960 sppp_auth_type_name(PPP_CHAP, h->type), 3961 h->ident, ntohs(h->len)); 3962 sppp_print_string((char *)name, name_len); 3963 addlog(" value-size=%d value=", value_len); 3964 sppp_print_bytes(value, value_len); 3965 addlog(">\n"); 3966 } 3967 if (value_len != sizeof(sp->myauth.challenge)) { 3968 if (debug) 3969 log(LOG_DEBUG, 3970 "%s: chap bad hash value length: " 3971 "%d bytes, should be %ld\n", 3972 ifp->if_xname, value_len, 3973 (long) sizeof(sp->myauth.challenge)); 3974 goto chap_failure; 3975 } 3976 3977 MD5Init(&ctx); 3978 MD5Update(&ctx, &h->ident, 1); 3979 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 3980 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 3981 MD5Final(digest, &ctx); 3982 3983 #define FAILMSG "Failed..." 3984 #define SUCCMSG "Welcome!" 3985 3986 if (value_len != sizeof digest || 3987 memcmp(digest, value, value_len) != 0) { 3988 chap_failure: 3989 /* action scn, tld */ 3990 x = splnet(); 3991 sp->pp_auth_failures++; 3992 splx(x); 3993 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 3994 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 3995 0); 3996 chap.tld(sp); 3997 break; 3998 } 3999 sp->pp_auth_failures = 0; 4000 /* action sca, perhaps tlu */ 4001 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4002 sp->state[IDX_CHAP] == STATE_OPENED) 4003 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4004 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4005 0); 4006 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4007 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4008 chap.tlu(sp); 4009 } 4010 break; 4011 4012 default: 4013 /* Unknown CHAP packet type -- ignore. */ 4014 if (debug) { 4015 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4016 "<0x%x id=0x%xh len=%d", 4017 ifp->if_xname, 4018 sppp_state_name(sp->state[IDX_CHAP]), 4019 h->type, h->ident, ntohs(h->len)); 4020 if (len > 4) 4021 sppp_print_bytes((u_char *)(h + 1), len - 4); 4022 addlog(">\n"); 4023 } 4024 break; 4025 4026 } 4027 } 4028 4029 static void 4030 sppp_chap_init(struct sppp *sp) 4031 { 4032 /* Chap doesn't have STATE_INITIAL at all. */ 4033 sp->state[IDX_CHAP] = STATE_CLOSED; 4034 sp->fail_counter[IDX_CHAP] = 0; 4035 sp->pp_seq[IDX_CHAP] = 0; 4036 sp->pp_rseq[IDX_CHAP] = 0; 4037 callout_init(&sp->ch[IDX_CHAP]); 4038 } 4039 4040 static void 4041 sppp_chap_open(struct sppp *sp) 4042 { 4043 if (sp->myauth.proto == PPP_CHAP && 4044 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4045 /* we are authenticator for CHAP, start it */ 4046 chap.scr(sp); 4047 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4048 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4049 } 4050 /* nothing to be done if we are peer, await a challenge */ 4051 } 4052 4053 static void 4054 sppp_chap_close(struct sppp *sp) 4055 { 4056 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4057 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4058 } 4059 4060 static void 4061 sppp_chap_TO(void *cookie) 4062 { 4063 struct sppp *sp = (struct sppp *)cookie; 4064 STDDCL; 4065 int s; 4066 4067 s = splnet(); 4068 if (debug) 4069 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4070 ifp->if_xname, 4071 sppp_state_name(sp->state[IDX_CHAP]), 4072 sp->rst_counter[IDX_CHAP]); 4073 4074 if (--sp->rst_counter[IDX_CHAP] < 0) 4075 /* TO- event */ 4076 switch (sp->state[IDX_CHAP]) { 4077 case STATE_REQ_SENT: 4078 chap.tld(sp); 4079 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4080 break; 4081 } 4082 else 4083 /* TO+ (or TO*) event */ 4084 switch (sp->state[IDX_CHAP]) { 4085 case STATE_OPENED: 4086 /* TO* event */ 4087 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4088 /* fall through */ 4089 case STATE_REQ_SENT: 4090 chap.scr(sp); 4091 /* sppp_cp_change_state() will restart the timer */ 4092 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4093 break; 4094 } 4095 4096 splx(s); 4097 } 4098 4099 static void 4100 sppp_chap_tlu(struct sppp *sp) 4101 { 4102 STDDCL; 4103 int i, x; 4104 4105 i = 0; 4106 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4107 4108 /* 4109 * Some broken CHAP implementations (Conware CoNet, firmware 4110 * 4.0.?) don't want to re-authenticate their CHAP once the 4111 * initial challenge-response exchange has taken place. 4112 * Provide for an option to avoid rechallenges. 4113 */ 4114 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4115 /* 4116 * Compute the re-challenge timeout. This will yield 4117 * a number between 300 and 810 seconds. 4118 */ 4119 i = 300 + ((unsigned)(arc4random() & 0xff00) >> 7); 4120 4121 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4122 } 4123 4124 if (debug) { 4125 log(LOG_DEBUG, 4126 "%s: chap %s, ", 4127 ifp->if_xname, 4128 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4129 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4130 addlog("next re-challenge in %d seconds\n", i); 4131 else 4132 addlog("re-challenging supressed\n"); 4133 } 4134 4135 x = splnet(); 4136 sp->pp_auth_failures = 0; 4137 /* indicate to LCP that we need to be closed down */ 4138 sp->lcp.protos |= (1 << IDX_CHAP); 4139 4140 if (sp->pp_flags & PP_NEEDAUTH) { 4141 /* 4142 * Remote is authenticator, but his auth proto didn't 4143 * complete yet. Defer the transition to network 4144 * phase. 4145 */ 4146 splx(x); 4147 return; 4148 } 4149 splx(x); 4150 4151 /* 4152 * If we are already in phase network, we are done here. This 4153 * is the case if this is a dummy tlu event after a re-challenge. 4154 */ 4155 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4156 sppp_phase_network(sp); 4157 } 4158 4159 static void 4160 sppp_chap_tld(struct sppp *sp) 4161 { 4162 STDDCL; 4163 4164 if (debug) 4165 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4166 callout_stop(&sp->ch[IDX_CHAP]); 4167 sp->lcp.protos &= ~(1 << IDX_CHAP); 4168 4169 lcp.Close(sp); 4170 } 4171 4172 static void 4173 sppp_chap_scr(struct sppp *sp) 4174 { 4175 u_int32_t *ch; 4176 u_char clen; 4177 4178 if (sp->myauth.name == NULL) { 4179 /* can't do anything usefull */ 4180 printf("%s: chap starting without my name being set\n", 4181 sp->pp_if.if_xname); 4182 return; 4183 } 4184 4185 /* Compute random challenge. */ 4186 ch = (u_int32_t *)sp->myauth.challenge; 4187 ch[0] = arc4random(); 4188 ch[1] = arc4random(); 4189 ch[2] = arc4random(); 4190 ch[3] = arc4random(); 4191 clen = 16; /* 4 * sizeof(u_int32_t) */ 4192 4193 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4194 4195 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4196 sizeof clen, (const char *)&clen, 4197 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4198 sp->myauth.name_len, 4199 sp->myauth.name, 4200 0); 4201 } 4202 4203 /* 4204 *--------------------------------------------------------------------------* 4205 * * 4206 * The PAP implementation. * 4207 * * 4208 *--------------------------------------------------------------------------* 4209 */ 4210 /* 4211 * For PAP, we need to keep a little state also if we are the peer, not the 4212 * authenticator. This is since we don't get a request to authenticate, but 4213 * have to repeatedly authenticate ourself until we got a response (or the 4214 * retry counter is expired). 4215 */ 4216 4217 /* 4218 * Handle incoming PAP packets. */ 4219 static void 4220 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4221 { 4222 STDDCL; 4223 struct lcp_header *h; 4224 int len, x; 4225 u_char mlen; 4226 char *name, *secret; 4227 int name_len, secret_len; 4228 4229 len = m->m_pkthdr.len; 4230 if (len < 5) { 4231 if (debug) 4232 log(LOG_DEBUG, 4233 "%s: pap invalid packet length: %d bytes\n", 4234 ifp->if_xname, len); 4235 return; 4236 } 4237 h = mtod(m, struct lcp_header *); 4238 if (len > ntohs(h->len)) 4239 len = ntohs(h->len); 4240 switch (h->type) { 4241 /* PAP request is my authproto */ 4242 case PAP_REQ: 4243 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4244 /* can't do anything usefull */ 4245 printf("%s: pap request without his name and his secret being set\n", 4246 ifp->if_xname); 4247 break; 4248 } 4249 name = 1 + (u_char *)(h + 1); 4250 name_len = name[-1]; 4251 secret = name + name_len + 1; 4252 if (name_len > len - 6 || 4253 (secret_len = secret[-1]) > len - 6 - name_len) { 4254 if (debug) { 4255 log(LOG_DEBUG, "%s: pap corrupted input " 4256 "<%s id=0x%x len=%d", 4257 ifp->if_xname, 4258 sppp_auth_type_name(PPP_PAP, h->type), 4259 h->ident, ntohs(h->len)); 4260 if (len > 4) 4261 sppp_print_bytes((u_char *)(h + 1), 4262 len - 4); 4263 addlog(">\n"); 4264 } 4265 break; 4266 } 4267 if (debug) { 4268 log(LOG_DEBUG, "%s: pap input(%s) " 4269 "<%s id=0x%x len=%d name=", 4270 ifp->if_xname, 4271 sppp_state_name(sp->state[IDX_PAP]), 4272 sppp_auth_type_name(PPP_PAP, h->type), 4273 h->ident, ntohs(h->len)); 4274 sppp_print_string((char *)name, name_len); 4275 addlog(" secret="); 4276 sppp_print_string((char *)secret, secret_len); 4277 addlog(">\n"); 4278 } 4279 if (name_len != sp->hisauth.name_len || 4280 secret_len != sp->hisauth.secret_len || 4281 memcmp(name, sp->hisauth.name, name_len) != 0 || 4282 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4283 /* action scn, tld */ 4284 sp->pp_auth_failures++; 4285 mlen = sizeof(FAILMSG) - 1; 4286 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4287 sizeof mlen, (const char *)&mlen, 4288 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4289 0); 4290 pap.tld(sp); 4291 break; 4292 } 4293 /* action sca, perhaps tlu */ 4294 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4295 sp->state[IDX_PAP] == STATE_OPENED) { 4296 mlen = sizeof(SUCCMSG) - 1; 4297 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4298 sizeof mlen, (const char *)&mlen, 4299 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4300 0); 4301 } 4302 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4303 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4304 pap.tlu(sp); 4305 } 4306 break; 4307 4308 /* ack and nak are his authproto */ 4309 case PAP_ACK: 4310 callout_stop(&sp->pap_my_to_ch); 4311 if (debug) { 4312 log(LOG_DEBUG, "%s: pap success", 4313 ifp->if_xname); 4314 name_len = *(char *)h; 4315 if (len > 5 && name_len) { 4316 addlog(": "); 4317 sppp_print_string((char *)(h + 1), name_len); 4318 } 4319 addlog("\n"); 4320 } 4321 x = splnet(); 4322 sp->pp_auth_failures = 0; 4323 sp->pp_flags &= ~PP_NEEDAUTH; 4324 if (sp->myauth.proto == PPP_PAP && 4325 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4326 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4327 /* 4328 * We are authenticator for PAP but didn't 4329 * complete yet. Leave it to tlu to proceed 4330 * to network phase. 4331 */ 4332 splx(x); 4333 break; 4334 } 4335 splx(x); 4336 sppp_phase_network(sp); 4337 break; 4338 4339 case PAP_NAK: 4340 callout_stop(&sp->pap_my_to_ch); 4341 sp->pp_auth_failures++; 4342 if (debug) { 4343 log(LOG_INFO, "%s: pap failure", 4344 ifp->if_xname); 4345 name_len = *(char *)h; 4346 if (len > 5 && name_len) { 4347 addlog(": "); 4348 sppp_print_string((char *)(h + 1), name_len); 4349 } 4350 addlog("\n"); 4351 } else 4352 log(LOG_INFO, "%s: pap failure\n", 4353 ifp->if_xname); 4354 /* await LCP shutdown by authenticator */ 4355 break; 4356 4357 default: 4358 /* Unknown PAP packet type -- ignore. */ 4359 if (debug) { 4360 log(LOG_DEBUG, "%s: pap corrupted input " 4361 "<0x%x id=0x%x len=%d", 4362 ifp->if_xname, 4363 h->type, h->ident, ntohs(h->len)); 4364 if (len > 4) 4365 sppp_print_bytes((u_char *)(h + 1), len - 4); 4366 addlog(">\n"); 4367 } 4368 break; 4369 4370 } 4371 } 4372 4373 static void 4374 sppp_pap_init(struct sppp *sp) 4375 { 4376 /* PAP doesn't have STATE_INITIAL at all. */ 4377 sp->state[IDX_PAP] = STATE_CLOSED; 4378 sp->fail_counter[IDX_PAP] = 0; 4379 sp->pp_seq[IDX_PAP] = 0; 4380 sp->pp_rseq[IDX_PAP] = 0; 4381 callout_init(&sp->ch[IDX_PAP]); 4382 callout_init(&sp->pap_my_to_ch); 4383 } 4384 4385 static void 4386 sppp_pap_open(struct sppp *sp) 4387 { 4388 if (sp->hisauth.proto == PPP_PAP && 4389 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4390 /* we are authenticator for PAP, start our timer */ 4391 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4392 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4393 } 4394 if (sp->myauth.proto == PPP_PAP) { 4395 /* we are peer, send a request, and start a timer */ 4396 pap.scr(sp); 4397 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4398 sppp_pap_my_TO, sp); 4399 } 4400 } 4401 4402 static void 4403 sppp_pap_close(struct sppp *sp) 4404 { 4405 if (sp->state[IDX_PAP] != STATE_CLOSED) 4406 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4407 } 4408 4409 /* 4410 * That's the timeout routine if we are authenticator. Since the 4411 * authenticator is basically passive in PAP, we can't do much here. 4412 */ 4413 static void 4414 sppp_pap_TO(void *cookie) 4415 { 4416 struct sppp *sp = (struct sppp *)cookie; 4417 STDDCL; 4418 int s; 4419 4420 s = splnet(); 4421 if (debug) 4422 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4423 ifp->if_xname, 4424 sppp_state_name(sp->state[IDX_PAP]), 4425 sp->rst_counter[IDX_PAP]); 4426 4427 if (--sp->rst_counter[IDX_PAP] < 0) 4428 /* TO- event */ 4429 switch (sp->state[IDX_PAP]) { 4430 case STATE_REQ_SENT: 4431 pap.tld(sp); 4432 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4433 break; 4434 } 4435 else 4436 /* TO+ event, not very much we could do */ 4437 switch (sp->state[IDX_PAP]) { 4438 case STATE_REQ_SENT: 4439 /* sppp_cp_change_state() will restart the timer */ 4440 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4441 break; 4442 } 4443 4444 splx(s); 4445 } 4446 4447 /* 4448 * That's the timeout handler if we are peer. Since the peer is active, 4449 * we need to retransmit our PAP request since it is apparently lost. 4450 * XXX We should impose a max counter. 4451 */ 4452 static void 4453 sppp_pap_my_TO(void *cookie) 4454 { 4455 struct sppp *sp = (struct sppp *)cookie; 4456 STDDCL; 4457 4458 if (debug) 4459 log(LOG_DEBUG, "%s: pap peer TO\n", 4460 ifp->if_xname); 4461 4462 pap.scr(sp); 4463 } 4464 4465 static void 4466 sppp_pap_tlu(struct sppp *sp) 4467 { 4468 STDDCL; 4469 int x; 4470 4471 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4472 4473 if (debug) 4474 log(LOG_DEBUG, "%s: %s tlu\n", 4475 ifp->if_xname, pap.name); 4476 4477 x = splnet(); 4478 sp->pp_auth_failures = 0; 4479 /* indicate to LCP that we need to be closed down */ 4480 sp->lcp.protos |= (1 << IDX_PAP); 4481 4482 if (sp->pp_flags & PP_NEEDAUTH) { 4483 /* 4484 * Remote is authenticator, but his auth proto didn't 4485 * complete yet. Defer the transition to network 4486 * phase. 4487 */ 4488 splx(x); 4489 return; 4490 } 4491 splx(x); 4492 sppp_phase_network(sp); 4493 } 4494 4495 static void 4496 sppp_pap_tld(struct sppp *sp) 4497 { 4498 STDDCL; 4499 4500 if (debug) 4501 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4502 callout_stop(&sp->ch[IDX_PAP]); 4503 callout_stop(&sp->pap_my_to_ch); 4504 sp->lcp.protos &= ~(1 << IDX_PAP); 4505 4506 lcp.Close(sp); 4507 } 4508 4509 static void 4510 sppp_pap_scr(struct sppp *sp) 4511 { 4512 u_char idlen, pwdlen; 4513 4514 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4515 /* can't do anything usefull */ 4516 printf("%s: pap starting without my name and secret being set\n", 4517 sp->pp_if.if_xname); 4518 return; 4519 } 4520 4521 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4522 pwdlen = sp->myauth.secret_len; 4523 idlen = sp->myauth.name_len; 4524 4525 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4526 sizeof idlen, (const char *)&idlen, 4527 idlen, sp->myauth.name, 4528 sizeof pwdlen, (const char *)&pwdlen, 4529 pwdlen, sp->myauth.secret, 4530 0); 4531 } 4532 4533 /* 4534 * Random miscellaneous functions. 4535 */ 4536 4537 /* 4538 * Send a PAP or CHAP proto packet. 4539 * 4540 * Varadic function, each of the elements for the ellipsis is of type 4541 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4542 * mlen == 0. 4543 * NOTE: never declare variadic functions with types subject to type 4544 * promotion (i.e. u_char). This is asking for big trouble depending 4545 * on the architecture you are on... 4546 */ 4547 4548 static void 4549 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4550 unsigned int type, unsigned int id, 4551 ...) 4552 { 4553 STDDCL; 4554 struct lcp_header *lh; 4555 struct mbuf *m; 4556 u_char *p; 4557 int len; 4558 size_t pkthdrlen; 4559 unsigned int mlen; 4560 const char *msg; 4561 va_list ap; 4562 4563 MGETHDR(m, M_DONTWAIT, MT_DATA); 4564 if (! m) 4565 return; 4566 m->m_pkthdr.rcvif = 0; 4567 4568 if (sp->pp_flags & PP_NOFRAMING) { 4569 *mtod(m, u_int16_t *) = htons(cp->proto); 4570 pkthdrlen = 2; 4571 lh = (struct lcp_header *)(mtod(m, u_int8_t *)+2); 4572 } else { 4573 struct ppp_header *h; 4574 h = mtod(m, struct ppp_header *); 4575 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4576 h->control = PPP_UI; /* Unnumbered Info */ 4577 h->protocol = htons(cp->proto); 4578 pkthdrlen = PPP_HEADER_LEN; 4579 4580 lh = (struct lcp_header *)(h + 1); 4581 } 4582 4583 lh->type = type; 4584 lh->ident = id; 4585 p = (u_char *)(lh + 1); 4586 4587 va_start(ap, id); 4588 len = 0; 4589 4590 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4591 msg = va_arg(ap, const char *); 4592 len += mlen; 4593 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4594 va_end(ap); 4595 m_freem(m); 4596 return; 4597 } 4598 4599 bcopy(msg, p, mlen); 4600 p += mlen; 4601 } 4602 va_end(ap); 4603 4604 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4605 lh->len = htons(LCP_HEADER_LEN + len); 4606 4607 if (debug) { 4608 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4609 ifp->if_xname, cp->name, 4610 sppp_auth_type_name(cp->proto, lh->type), 4611 lh->ident, ntohs(lh->len)); 4612 if (len) 4613 sppp_print_bytes((u_char *)(lh + 1), len); 4614 addlog(">\n"); 4615 } 4616 if (IF_QFULL(&sp->pp_cpq)) { 4617 IF_DROP(&sp->pp_fastq); 4618 IF_DROP(&ifp->if_snd); 4619 m_freem(m); 4620 ++ifp->if_oerrors; 4621 return; 4622 } else 4623 IF_ENQUEUE(&sp->pp_cpq, m); 4624 if (! (ifp->if_flags & IFF_OACTIVE)) 4625 (*ifp->if_start)(ifp); 4626 ifp->if_obytes += m->m_pkthdr.len + 3; 4627 } 4628 4629 /* 4630 * Send keepalive packets, every 10 seconds. 4631 */ 4632 static void 4633 sppp_keepalive(void *dummy) 4634 { 4635 struct sppp *sp; 4636 int s; 4637 time_t now; 4638 4639 s = splnet(); 4640 now = mono_time.tv_sec; 4641 for (sp=spppq; sp; sp=sp->pp_next) { 4642 struct ifnet *ifp = &sp->pp_if; 4643 4644 /* check idle timeout */ 4645 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4646 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4647 /* idle timeout is enabled for this interface */ 4648 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4649 if (ifp->if_flags & IFF_DEBUG) 4650 printf("%s: no activity for %lu seconds\n", 4651 sp->pp_if.if_xname, 4652 (unsigned long)(now-sp->pp_last_activity)); 4653 lcp.Close(sp); 4654 continue; 4655 } 4656 } 4657 4658 /* Keepalive mode disabled or channel down? */ 4659 if (! (sp->pp_flags & PP_KEEPALIVE) || 4660 ! (ifp->if_flags & IFF_RUNNING)) 4661 continue; 4662 4663 /* No keepalive in PPP mode if LCP not opened yet. */ 4664 if (! (sp->pp_flags & PP_CISCO) && 4665 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4666 continue; 4667 4668 /* No echo reply, but maybe user data passed through? */ 4669 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4670 sp->pp_alivecnt = 0; 4671 continue; 4672 } 4673 4674 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4675 /* No keepalive packets got. Stop the interface. */ 4676 if_down (ifp); 4677 IF_PURGE(&sp->pp_cpq); 4678 if (! (sp->pp_flags & PP_CISCO)) { 4679 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4680 ifp->if_xname); 4681 sp->pp_alivecnt = 0; 4682 4683 /* we are down, close all open protocols */ 4684 lcp.Close(sp); 4685 4686 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4687 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4688 4689 /* Close connection imediatly, completition of this 4690 * will summon the magic needed to reestablish it. */ 4691 sp->pp_tlf(sp); 4692 continue; 4693 } 4694 } 4695 if (sp->pp_alivecnt < sp->pp_maxalive) 4696 ++sp->pp_alivecnt; 4697 if (sp->pp_flags & PP_CISCO) 4698 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4699 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4700 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4701 int32_t nmagic = htonl(sp->lcp.magic); 4702 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4703 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4704 sp->lcp.echoid, 4, &nmagic); 4705 } 4706 } 4707 splx(s); 4708 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4709 } 4710 4711 #ifdef INET 4712 /* 4713 * Get both IP addresses. 4714 */ 4715 static void 4716 sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, u_int32_t *srcmask) 4717 { 4718 struct ifnet *ifp = &sp->pp_if; 4719 struct ifaddr *ifa; 4720 struct sockaddr_in *si, *sm; 4721 u_int32_t ssrc, ddst; 4722 4723 sm = NULL; 4724 ssrc = ddst = 0; 4725 /* 4726 * Pick the first AF_INET address from the list, 4727 * aliases don't make any sense on a p2p link anyway. 4728 */ 4729 si = 0; 4730 IFADDR_FOREACH(ifa, ifp) { 4731 if (ifa->ifa_addr->sa_family == AF_INET) { 4732 si = (struct sockaddr_in *)ifa->ifa_addr; 4733 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4734 if (si) 4735 break; 4736 } 4737 } 4738 if (ifa) { 4739 if (si && si->sin_addr.s_addr) { 4740 ssrc = si->sin_addr.s_addr; 4741 if (srcmask) 4742 *srcmask = ntohl(sm->sin_addr.s_addr); 4743 } 4744 4745 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4746 if (si && si->sin_addr.s_addr) 4747 ddst = si->sin_addr.s_addr; 4748 } 4749 4750 if (dst) *dst = ntohl(ddst); 4751 if (src) *src = ntohl(ssrc); 4752 } 4753 4754 /* 4755 * Set IP addresses. Must be called at splnet. 4756 * If an address is 0, leave it the way it is. 4757 */ 4758 static void 4759 sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr) 4760 { 4761 STDDCL; 4762 struct ifaddr *ifa; 4763 struct sockaddr_in *si, *dest; 4764 4765 /* 4766 * Pick the first AF_INET address from the list, 4767 * aliases don't make any sense on a p2p link anyway. 4768 */ 4769 4770 IFADDR_FOREACH(ifa, ifp) { 4771 if (ifa->ifa_addr->sa_family == AF_INET) { 4772 si = (struct sockaddr_in *)ifa->ifa_addr; 4773 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4774 goto found; 4775 } 4776 } 4777 return; 4778 4779 found: 4780 { 4781 int error; 4782 struct sockaddr_in new_sin = *si; 4783 struct sockaddr_in new_dst = *dest; 4784 4785 /* 4786 * Scrub old routes now instead of calling in_ifinit with 4787 * scrub=1, because we may change the dstaddr 4788 * before the call to in_ifinit. 4789 */ 4790 in_ifscrub(ifp, ifatoia(ifa)); 4791 4792 if (myaddr != 0) 4793 new_sin.sin_addr.s_addr = htonl(myaddr); 4794 if (hisaddr != 0) { 4795 new_dst.sin_addr.s_addr = htonl(hisaddr); 4796 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4797 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4798 *dest = new_dst; /* fix dstaddr in place */ 4799 } 4800 } 4801 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4802 if (debug && error) 4803 { 4804 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4805 " failed, error=%d\n", ifp->if_xname, error); 4806 } 4807 #ifdef PFIL_HOOKS 4808 if (!error) 4809 (void)pfil_run_hooks(&if_pfil, 4810 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4811 #endif 4812 } 4813 } 4814 4815 /* 4816 * Clear IP addresses. Must be called at splnet. 4817 */ 4818 static void 4819 sppp_clear_ip_addrs(struct sppp *sp) 4820 { 4821 struct ifnet *ifp = &sp->pp_if; 4822 struct ifaddr *ifa; 4823 struct sockaddr_in *si, *dest; 4824 4825 u_int32_t remote; 4826 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4827 remote = sp->ipcp.saved_hisaddr; 4828 else 4829 sppp_get_ip_addrs(sp, 0, &remote, 0); 4830 4831 /* 4832 * Pick the first AF_INET address from the list, 4833 * aliases don't make any sense on a p2p link anyway. 4834 */ 4835 4836 IFADDR_FOREACH(ifa, ifp) { 4837 if (ifa->ifa_addr->sa_family == AF_INET) { 4838 si = (struct sockaddr_in *)ifa->ifa_addr; 4839 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4840 goto found; 4841 } 4842 } 4843 return; 4844 4845 found: 4846 { 4847 struct sockaddr_in new_sin = *si; 4848 4849 in_ifscrub(ifp, ifatoia(ifa)); 4850 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4851 new_sin.sin_addr.s_addr = 0; 4852 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4853 /* replace peer addr in place */ 4854 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4855 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4856 #ifdef PFIL_HOOKS 4857 (void)pfil_run_hooks(&if_pfil, 4858 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4859 #endif 4860 } 4861 } 4862 #endif 4863 4864 #ifdef INET6 4865 /* 4866 * Get both IPv6 addresses. 4867 */ 4868 static void 4869 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4870 struct in6_addr *srcmask) 4871 { 4872 struct ifnet *ifp = &sp->pp_if; 4873 struct ifaddr *ifa; 4874 struct sockaddr_in6 *si, *sm; 4875 struct in6_addr ssrc, ddst; 4876 4877 sm = NULL; 4878 memset(&ssrc, 0, sizeof(ssrc)); 4879 memset(&ddst, 0, sizeof(ddst)); 4880 /* 4881 * Pick the first link-local AF_INET6 address from the list, 4882 * aliases don't make any sense on a p2p link anyway. 4883 */ 4884 si = 0; 4885 IFADDR_FOREACH(ifa, ifp) 4886 if (ifa->ifa_addr->sa_family == AF_INET6) { 4887 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4888 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4889 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4890 break; 4891 } 4892 if (ifa) { 4893 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4894 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 4895 if (srcmask) { 4896 bcopy(&sm->sin6_addr, srcmask, 4897 sizeof(*srcmask)); 4898 } 4899 } 4900 4901 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4902 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4903 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 4904 } 4905 4906 if (dst) 4907 bcopy(&ddst, dst, sizeof(*dst)); 4908 if (src) 4909 bcopy(&ssrc, src, sizeof(*src)); 4910 } 4911 4912 #ifdef IPV6CP_MYIFID_DYN 4913 /* 4914 * Generate random ifid. 4915 */ 4916 static void 4917 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 4918 { 4919 /* TBD */ 4920 } 4921 4922 /* 4923 * Set my IPv6 address. Must be called at splnet. 4924 */ 4925 static void 4926 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 4927 { 4928 STDDCL; 4929 struct ifaddr *ifa; 4930 struct sockaddr_in6 *sin6; 4931 4932 /* 4933 * Pick the first link-local AF_INET6 address from the list, 4934 * aliases don't make any sense on a p2p link anyway. 4935 */ 4936 4937 sin6 = NULL; 4938 IFADDR_FOREACH(ifa, ifp) 4939 { 4940 if (ifa->ifa_addr->sa_family == AF_INET6) 4941 { 4942 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 4943 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 4944 break; 4945 } 4946 } 4947 4948 if (ifa && sin6) 4949 { 4950 int error; 4951 struct sockaddr_in6 new_sin6 = *sin6; 4952 4953 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 4954 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 4955 if (debug && error) 4956 { 4957 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 4958 " failed, error=%d\n", ifp->if_xname, error); 4959 } 4960 #ifdef PFIL_HOOKS 4961 if (!error) 4962 (void)pfil_run_hooks(&if_pfil, 4963 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 4964 #endif 4965 } 4966 } 4967 #endif 4968 4969 /* 4970 * Suggest a candidate address to be used by peer. 4971 */ 4972 static void 4973 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 4974 { 4975 struct in6_addr myaddr; 4976 struct timeval tv; 4977 4978 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 4979 4980 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 4981 microtime(&tv); 4982 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 4983 myaddr.s6_addr[14] ^= 0xff; 4984 myaddr.s6_addr[15] ^= 0xff; 4985 } else { 4986 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 4987 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 4988 } 4989 if (suggest) 4990 bcopy(&myaddr, suggest, sizeof(myaddr)); 4991 } 4992 #endif /*INET6*/ 4993 4994 /* 4995 * Process ioctl requests specific to the PPP interface. 4996 * Permissions have already been checked. 4997 */ 4998 static int 4999 sppp_params(struct sppp *sp, int cmd, void *data) 5000 { 5001 switch (cmd) { 5002 case SPPPGETAUTHCFG: 5003 { 5004 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5005 int error; 5006 size_t len; 5007 5008 cfg->myauthflags = sp->myauth.flags; 5009 cfg->hisauthflags = sp->hisauth.flags; 5010 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5011 cfg->hisauth = 0; 5012 if (sp->hisauth.proto) 5013 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5014 cfg->myauth = 0; 5015 if (sp->myauth.proto) 5016 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5017 if (cfg->myname_length == 0) { 5018 if (sp->myauth.name != NULL) 5019 cfg->myname_length = sp->myauth.name_len + 1; 5020 } else { 5021 if (sp->myauth.name == NULL) { 5022 cfg->myname_length = 0; 5023 } else { 5024 len = sp->myauth.name_len + 1; 5025 if (cfg->myname_length < len) 5026 return (ENAMETOOLONG); 5027 error = copyout(sp->myauth.name, cfg->myname, len); 5028 if (error) return error; 5029 } 5030 } 5031 if (cfg->hisname_length == 0) { 5032 if (sp->hisauth.name != NULL) 5033 cfg->hisname_length = sp->hisauth.name_len + 1; 5034 } else { 5035 if (sp->hisauth.name == NULL) { 5036 cfg->hisname_length = 0; 5037 } else { 5038 len = sp->hisauth.name_len + 1; 5039 if (cfg->hisname_length < len) 5040 return (ENAMETOOLONG); 5041 error = copyout(sp->hisauth.name, cfg->hisname, len); 5042 if (error) return error; 5043 } 5044 } 5045 } 5046 break; 5047 case SPPPSETAUTHCFG: 5048 { 5049 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5050 int error; 5051 5052 if (sp->myauth.name) { 5053 free(sp->myauth.name, M_DEVBUF); 5054 sp->myauth.name = NULL; 5055 } 5056 if (sp->myauth.secret) { 5057 free(sp->myauth.secret, M_DEVBUF); 5058 sp->myauth.secret = NULL; 5059 } 5060 if (sp->hisauth.name) { 5061 free(sp->hisauth.name, M_DEVBUF); 5062 sp->hisauth.name = NULL; 5063 } 5064 if (sp->hisauth.secret) { 5065 free(sp->hisauth.secret, M_DEVBUF); 5066 sp->hisauth.secret = NULL; 5067 } 5068 5069 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5070 if (cfg->hisname_length >= MCLBYTES) 5071 return (ENAMETOOLONG); 5072 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5073 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5074 if (error) { 5075 free(sp->hisauth.name, M_DEVBUF); 5076 sp->hisauth.name = NULL; 5077 return error; 5078 } 5079 sp->hisauth.name_len = cfg->hisname_length - 1; 5080 sp->hisauth.name[sp->hisauth.name_len] = 0; 5081 } 5082 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5083 if (cfg->hissecret_length >= MCLBYTES) 5084 return (ENAMETOOLONG); 5085 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5086 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5087 if (error) { 5088 free(sp->hisauth.secret, M_DEVBUF); 5089 sp->hisauth.secret = NULL; 5090 return error; 5091 } 5092 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5093 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5094 } 5095 if (cfg->myname != NULL && cfg->myname_length > 0) { 5096 if (cfg->myname_length >= MCLBYTES) 5097 return (ENAMETOOLONG); 5098 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5099 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5100 if (error) { 5101 free(sp->myauth.name, M_DEVBUF); 5102 sp->myauth.name = NULL; 5103 return error; 5104 } 5105 sp->myauth.name_len = cfg->myname_length - 1; 5106 sp->myauth.name[sp->myauth.name_len] = 0; 5107 } 5108 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5109 if (cfg->mysecret_length >= MCLBYTES) 5110 return (ENAMETOOLONG); 5111 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5112 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5113 if (error) { 5114 free(sp->myauth.secret, M_DEVBUF); 5115 sp->myauth.secret = NULL; 5116 return error; 5117 } 5118 sp->myauth.secret_len = cfg->mysecret_length - 1; 5119 sp->myauth.secret[sp->myauth.secret_len] = 0; 5120 } 5121 sp->myauth.flags = cfg->myauthflags; 5122 if (cfg->myauth) 5123 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5124 sp->hisauth.flags = cfg->hisauthflags; 5125 if (cfg->hisauth) 5126 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5127 sp->pp_auth_failures = 0; 5128 if (sp->hisauth.proto != 0) 5129 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5130 else 5131 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5132 } 5133 break; 5134 case SPPPGETLCPCFG: 5135 { 5136 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5137 lcpp->lcp_timeout = sp->lcp.timeout; 5138 } 5139 break; 5140 case SPPPSETLCPCFG: 5141 { 5142 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5143 sp->lcp.timeout = lcpp->lcp_timeout; 5144 } 5145 break; 5146 case SPPPGETSTATUS: 5147 { 5148 struct spppstatus *status = (struct spppstatus *)data; 5149 status->phase = sp->pp_phase; 5150 } 5151 break; 5152 case SPPPGETSTATUSNCP: 5153 { 5154 struct spppstatusncp *status = (struct spppstatusncp *)data; 5155 status->phase = sp->pp_phase; 5156 status->ncpup = sppp_ncp_check(sp); 5157 } 5158 break; 5159 case SPPPGETIDLETO: 5160 { 5161 struct spppidletimeout *to = (struct spppidletimeout *)data; 5162 to->idle_seconds = sp->pp_idle_timeout; 5163 } 5164 break; 5165 case SPPPSETIDLETO: 5166 { 5167 struct spppidletimeout *to = (struct spppidletimeout *)data; 5168 sp->pp_idle_timeout = to->idle_seconds; 5169 } 5170 break; 5171 case SPPPSETAUTHFAILURE: 5172 { 5173 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5174 sp->pp_max_auth_fail = afsettings->max_failures; 5175 sp->pp_auth_failures = 0; 5176 } 5177 break; 5178 case SPPPGETAUTHFAILURES: 5179 { 5180 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5181 stats->auth_failures = sp->pp_auth_failures; 5182 stats->max_failures = sp->pp_max_auth_fail; 5183 } 5184 break; 5185 case SPPPSETDNSOPTS: 5186 { 5187 struct spppdnssettings *req = (struct spppdnssettings *)data; 5188 sp->query_dns = req->query_dns & 3; 5189 } 5190 break; 5191 case SPPPGETDNSOPTS: 5192 { 5193 struct spppdnssettings *req = (struct spppdnssettings *)data; 5194 req->query_dns = sp->query_dns; 5195 } 5196 break; 5197 case SPPPGETDNSADDRS: 5198 { 5199 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5200 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5201 } 5202 break; 5203 case SPPPGETKEEPALIVE: 5204 { 5205 struct spppkeepalivesettings *settings = 5206 (struct spppkeepalivesettings*)data; 5207 settings->maxalive = sp->pp_maxalive; 5208 settings->max_noreceive = sp->pp_max_noreceive; 5209 } 5210 break; 5211 case SPPPSETKEEPALIVE: 5212 { 5213 struct spppkeepalivesettings *settings = 5214 (struct spppkeepalivesettings*)data; 5215 sp->pp_maxalive = settings->maxalive; 5216 sp->pp_max_noreceive = settings->max_noreceive; 5217 } 5218 break; 5219 default: 5220 return (EINVAL); 5221 } 5222 5223 return (0); 5224 } 5225 5226 static void 5227 sppp_phase_network(struct sppp *sp) 5228 { 5229 STDDCL; 5230 int i; 5231 u_int32_t mask; 5232 5233 sp->pp_phase = SPPP_PHASE_NETWORK; 5234 5235 if (debug) 5236 { 5237 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5238 sppp_phase_name(sp->pp_phase)); 5239 } 5240 5241 /* Notify NCPs now. */ 5242 for (i = 0; i < IDX_COUNT; i++) 5243 if ((cps[i])->flags & CP_NCP) 5244 (cps[i])->Open(sp); 5245 5246 /* Send Up events to all NCPs. */ 5247 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5248 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5249 (cps[i])->Up(sp); 5250 5251 /* if no NCP is starting, all this was in vain, close down */ 5252 sppp_lcp_check_and_close(sp); 5253 } 5254 5255 5256 static const char * 5257 sppp_cp_type_name(u_char type) 5258 { 5259 static char buf[12]; 5260 switch (type) { 5261 case CONF_REQ: return "conf-req"; 5262 case CONF_ACK: return "conf-ack"; 5263 case CONF_NAK: return "conf-nak"; 5264 case CONF_REJ: return "conf-rej"; 5265 case TERM_REQ: return "term-req"; 5266 case TERM_ACK: return "term-ack"; 5267 case CODE_REJ: return "code-rej"; 5268 case PROTO_REJ: return "proto-rej"; 5269 case ECHO_REQ: return "echo-req"; 5270 case ECHO_REPLY: return "echo-reply"; 5271 case DISC_REQ: return "discard-req"; 5272 } 5273 snprintf(buf, sizeof(buf), "0x%x", type); 5274 return buf; 5275 } 5276 5277 static const char * 5278 sppp_auth_type_name(u_short proto, u_char type) 5279 { 5280 static char buf[12]; 5281 switch (proto) { 5282 case PPP_CHAP: 5283 switch (type) { 5284 case CHAP_CHALLENGE: return "challenge"; 5285 case CHAP_RESPONSE: return "response"; 5286 case CHAP_SUCCESS: return "success"; 5287 case CHAP_FAILURE: return "failure"; 5288 } 5289 case PPP_PAP: 5290 switch (type) { 5291 case PAP_REQ: return "req"; 5292 case PAP_ACK: return "ack"; 5293 case PAP_NAK: return "nak"; 5294 } 5295 } 5296 snprintf(buf, sizeof(buf), "0x%x", type); 5297 return buf; 5298 } 5299 5300 static const char * 5301 sppp_lcp_opt_name(u_char opt) 5302 { 5303 static char buf[12]; 5304 switch (opt) { 5305 case LCP_OPT_MRU: return "mru"; 5306 case LCP_OPT_ASYNC_MAP: return "async-map"; 5307 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5308 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5309 case LCP_OPT_MAGIC: return "magic"; 5310 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5311 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5312 } 5313 snprintf(buf, sizeof(buf), "0x%x", opt); 5314 return buf; 5315 } 5316 5317 static const char * 5318 sppp_ipcp_opt_name(u_char opt) 5319 { 5320 static char buf[12]; 5321 switch (opt) { 5322 case IPCP_OPT_ADDRESSES: return "addresses"; 5323 case IPCP_OPT_COMPRESSION: return "compression"; 5324 case IPCP_OPT_ADDRESS: return "address"; 5325 } 5326 snprintf(buf, sizeof(buf), "0x%x", opt); 5327 return buf; 5328 } 5329 5330 #ifdef INET6 5331 static const char * 5332 sppp_ipv6cp_opt_name(u_char opt) 5333 { 5334 static char buf[12]; 5335 switch (opt) { 5336 case IPV6CP_OPT_IFID: return "ifid"; 5337 case IPV6CP_OPT_COMPRESSION: return "compression"; 5338 } 5339 snprintf(buf, sizeof(buf), "0x%x", opt); 5340 return buf; 5341 } 5342 #endif 5343 5344 static const char * 5345 sppp_state_name(int state) 5346 { 5347 switch (state) { 5348 case STATE_INITIAL: return "initial"; 5349 case STATE_STARTING: return "starting"; 5350 case STATE_CLOSED: return "closed"; 5351 case STATE_STOPPED: return "stopped"; 5352 case STATE_CLOSING: return "closing"; 5353 case STATE_STOPPING: return "stopping"; 5354 case STATE_REQ_SENT: return "req-sent"; 5355 case STATE_ACK_RCVD: return "ack-rcvd"; 5356 case STATE_ACK_SENT: return "ack-sent"; 5357 case STATE_OPENED: return "opened"; 5358 } 5359 return "illegal"; 5360 } 5361 5362 static const char * 5363 sppp_phase_name(int phase) 5364 { 5365 switch (phase) { 5366 case SPPP_PHASE_DEAD: return "dead"; 5367 case SPPP_PHASE_ESTABLISH: return "establish"; 5368 case SPPP_PHASE_TERMINATE: return "terminate"; 5369 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5370 case SPPP_PHASE_NETWORK: return "network"; 5371 } 5372 return "illegal"; 5373 } 5374 5375 static const char * 5376 sppp_proto_name(u_short proto) 5377 { 5378 static char buf[12]; 5379 switch (proto) { 5380 case PPP_LCP: return "lcp"; 5381 case PPP_IPCP: return "ipcp"; 5382 case PPP_PAP: return "pap"; 5383 case PPP_CHAP: return "chap"; 5384 case PPP_IPV6CP: return "ipv6cp"; 5385 } 5386 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5387 return buf; 5388 } 5389 5390 static void 5391 sppp_print_bytes(const u_char *p, u_short len) 5392 { 5393 addlog(" %02x", *p++); 5394 while (--len > 0) 5395 addlog("-%02x", *p++); 5396 } 5397 5398 static void 5399 sppp_print_string(const char *p, u_short len) 5400 { 5401 u_char c; 5402 5403 while (len-- > 0) { 5404 c = *p++; 5405 /* 5406 * Print only ASCII chars directly. RFC 1994 recommends 5407 * using only them, but we don't rely on it. */ 5408 if (c < ' ' || c > '~') 5409 addlog("\\x%x", c); 5410 else 5411 addlog("%c", c); 5412 } 5413 } 5414 5415 static const char * 5416 sppp_dotted_quad(u_int32_t addr) 5417 { 5418 static char s[16]; 5419 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5420 (int)((addr >> 24) & 0xff), 5421 (int)((addr >> 16) & 0xff), 5422 (int)((addr >> 8) & 0xff), 5423 (int)(addr & 0xff)); 5424 return s; 5425 } 5426 5427 /* a dummy, used to drop uninteresting events */ 5428 static void 5429 sppp_null(struct sppp *unused) 5430 { 5431 /* do just nothing */ 5432 } 5433 /* 5434 * This file is large. Tell emacs to highlight it nevertheless. 5435 * 5436 * Local Variables: 5437 * hilit-auto-highlight-maxout: 120000 5438 * End: 5439 */ 5440
Indexes created Mon Oct 13 16:09:52 GMT 2025