if_spppsubr.c revision 1.130.6.1
1 /* $NetBSD: if_spppsubr.c,v 1.130.6.1 2017/01/18 08:46:46 skrll 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 1.130.6.1 2017/01/18 08:46:46 skrll Exp $"); 45 46 #if defined(_KERNEL_OPT) 47 #include "opt_inet.h" 48 #include "opt_ipx.h" 49 #include "opt_modular.h" 50 #include "opt_compat_netbsd.h" 51 #endif 52 53 54 #include <sys/param.h> 55 #include <sys/proc.h> 56 #include <sys/systm.h> 57 #include <sys/kernel.h> 58 #include <sys/sockio.h> 59 #include <sys/socket.h> 60 #include <sys/syslog.h> 61 #include <sys/malloc.h> 62 #include <sys/mbuf.h> 63 #include <sys/callout.h> 64 #include <sys/md5.h> 65 #include <sys/inttypes.h> 66 #include <sys/kauth.h> 67 #include <sys/cprng.h> 68 69 #include <net/if.h> 70 #include <net/netisr.h> 71 #include <net/if_types.h> 72 #include <net/route.h> 73 #include <net/ppp_defs.h> 74 75 #include <netinet/in.h> 76 #include <netinet/in_systm.h> 77 #include <netinet/in_var.h> 78 #ifdef INET 79 #include <netinet/ip.h> 80 #include <netinet/tcp.h> 81 #endif 82 #include <net/ethertypes.h> 83 84 #ifdef INET6 85 #include <netinet6/scope6_var.h> 86 #endif 87 88 #ifdef IPX 89 #include <netipx/ipx.h> 90 #include <netipx/ipx_if.h> 91 #endif 92 93 #include <net/if_sppp.h> 94 #include <net/if_spppvar.h> 95 96 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds between checks */ 97 #define LOOPALIVECNT 3 /* loopback detection tries */ 98 #define DEFAULT_MAXALIVECNT 3 /* max. missed alive packets */ 99 #define DEFAULT_NORECV_TIME 15 /* before we get worried */ 100 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 101 102 /* 103 * Interface flags that can be set in an ifconfig command. 104 * 105 * Setting link0 will make the link passive, i.e. it will be marked 106 * as being administrative openable, but won't be opened to begin 107 * with. Incoming calls will be answered, or subsequent calls with 108 * -link1 will cause the administrative open of the LCP layer. 109 * 110 * Setting link1 will cause the link to auto-dial only as packets 111 * arrive to be sent. 112 * 113 * Setting IFF_DEBUG will syslog the option negotiation and state 114 * transitions at level kern.debug. Note: all logs consistently look 115 * like 116 * 117 * <if-name><unit>: <proto-name> <additional info...> 118 * 119 * with <if-name><unit> being something like "bppp0", and <proto-name> 120 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 121 */ 122 123 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 124 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 125 126 #define CONF_REQ 1 /* PPP configure request */ 127 #define CONF_ACK 2 /* PPP configure acknowledge */ 128 #define CONF_NAK 3 /* PPP configure negative ack */ 129 #define CONF_REJ 4 /* PPP configure reject */ 130 #define TERM_REQ 5 /* PPP terminate request */ 131 #define TERM_ACK 6 /* PPP terminate acknowledge */ 132 #define CODE_REJ 7 /* PPP code reject */ 133 #define PROTO_REJ 8 /* PPP protocol reject */ 134 #define ECHO_REQ 9 /* PPP echo request */ 135 #define ECHO_REPLY 10 /* PPP echo reply */ 136 #define DISC_REQ 11 /* PPP discard request */ 137 138 #define LCP_OPT_MRU 1 /* maximum receive unit */ 139 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 140 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 141 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 142 #define LCP_OPT_MAGIC 5 /* magic number */ 143 #define LCP_OPT_RESERVED 6 /* reserved */ 144 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 145 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 146 147 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 148 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 149 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 150 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 151 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 152 153 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 154 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 155 156 #define PAP_REQ 1 /* PAP name/password request */ 157 #define PAP_ACK 2 /* PAP acknowledge */ 158 #define PAP_NAK 3 /* PAP fail */ 159 160 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 161 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 162 #define CHAP_SUCCESS 3 /* CHAP response ok */ 163 #define CHAP_FAILURE 4 /* CHAP response failed */ 164 165 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 166 167 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 168 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 169 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 170 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 171 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 172 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 173 174 /* states are named and numbered according to RFC 1661 */ 175 #define STATE_INITIAL 0 176 #define STATE_STARTING 1 177 #define STATE_CLOSED 2 178 #define STATE_STOPPED 3 179 #define STATE_CLOSING 4 180 #define STATE_STOPPING 5 181 #define STATE_REQ_SENT 6 182 #define STATE_ACK_RCVD 7 183 #define STATE_ACK_SENT 8 184 #define STATE_OPENED 9 185 186 struct ppp_header { 187 uint8_t address; 188 uint8_t control; 189 uint16_t protocol; 190 } __packed; 191 #define PPP_HEADER_LEN sizeof (struct ppp_header) 192 193 struct lcp_header { 194 uint8_t type; 195 uint8_t ident; 196 uint16_t len; 197 } __packed; 198 #define LCP_HEADER_LEN sizeof (struct lcp_header) 199 200 struct cisco_packet { 201 uint32_t type; 202 uint32_t par1; 203 uint32_t par2; 204 uint16_t rel; 205 uint16_t time0; 206 uint16_t time1; 207 } __packed; 208 #define CISCO_PACKET_LEN 18 209 210 /* 211 * We follow the spelling and capitalization of RFC 1661 here, to make 212 * it easier comparing with the standard. Please refer to this RFC in 213 * case you can't make sense out of these abbreviation; it will also 214 * explain the semantics related to the various events and actions. 215 */ 216 struct cp { 217 u_short proto; /* PPP control protocol number */ 218 u_char protoidx; /* index into state table in struct sppp */ 219 u_char flags; 220 #define CP_LCP 0x01 /* this is the LCP */ 221 #define CP_AUTH 0x02 /* this is an authentication protocol */ 222 #define CP_NCP 0x04 /* this is a NCP */ 223 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 224 const char *name; /* name of this control protocol */ 225 /* event handlers */ 226 void (*Up)(struct sppp *sp); 227 void (*Down)(struct sppp *sp); 228 void (*Open)(struct sppp *sp); 229 void (*Close)(struct sppp *sp); 230 void (*TO)(void *sp); 231 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 232 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 233 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 234 /* actions */ 235 void (*tlu)(struct sppp *sp); 236 void (*tld)(struct sppp *sp); 237 void (*tls)(struct sppp *sp); 238 void (*tlf)(struct sppp *sp); 239 void (*scr)(struct sppp *sp); 240 }; 241 242 static struct sppp *spppq; 243 static callout_t keepalive_ch; 244 245 #ifdef INET 246 /* 247 * The following disgusting hack gets around the problem that IP TOS 248 * can't be set yet. We want to put "interactive" traffic on a high 249 * priority queue. To decide if traffic is interactive, we check that 250 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 251 * 252 * XXX is this really still necessary? - joerg - 253 */ 254 static u_short interactive_ports[8] = { 255 0, 513, 0, 0, 256 0, 21, 0, 23, 257 }; 258 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 259 #endif 260 261 /* almost every function needs these */ 262 #define STDDCL \ 263 struct ifnet *ifp = &sp->pp_if; \ 264 int debug = ifp->if_flags & IFF_DEBUG 265 266 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 267 const struct sockaddr *dst, struct rtentry *rt); 268 269 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 270 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 271 272 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 273 struct mbuf *m); 274 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 275 u_char ident, u_short len, void *data); 276 /* static void sppp_cp_timeout(void *arg); */ 277 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 278 int newstate); 279 static void sppp_auth_send(const struct cp *cp, 280 struct sppp *sp, unsigned int type, unsigned int id, 281 ...); 282 283 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 284 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 285 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 286 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 287 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 288 289 static void sppp_null(struct sppp *sp); 290 291 static void sppp_lcp_init(struct sppp *sp); 292 static void sppp_lcp_up(struct sppp *sp); 293 static void sppp_lcp_down(struct sppp *sp); 294 static void sppp_lcp_open(struct sppp *sp); 295 static void sppp_lcp_close(struct sppp *sp); 296 static void sppp_lcp_TO(void *sp); 297 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 298 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 299 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 300 static void sppp_lcp_tlu(struct sppp *sp); 301 static void sppp_lcp_tld(struct sppp *sp); 302 static void sppp_lcp_tls(struct sppp *sp); 303 static void sppp_lcp_tlf(struct sppp *sp); 304 static void sppp_lcp_scr(struct sppp *sp); 305 static void sppp_lcp_check_and_close(struct sppp *sp); 306 static int sppp_ncp_check(struct sppp *sp); 307 308 static void sppp_ipcp_init(struct sppp *sp); 309 static void sppp_ipcp_up(struct sppp *sp); 310 static void sppp_ipcp_down(struct sppp *sp); 311 static void sppp_ipcp_open(struct sppp *sp); 312 static void sppp_ipcp_close(struct sppp *sp); 313 static void sppp_ipcp_TO(void *sp); 314 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 315 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 316 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 317 static void sppp_ipcp_tlu(struct sppp *sp); 318 static void sppp_ipcp_tld(struct sppp *sp); 319 static void sppp_ipcp_tls(struct sppp *sp); 320 static void sppp_ipcp_tlf(struct sppp *sp); 321 static void sppp_ipcp_scr(struct sppp *sp); 322 323 static void sppp_ipv6cp_init(struct sppp *sp); 324 static void sppp_ipv6cp_up(struct sppp *sp); 325 static void sppp_ipv6cp_down(struct sppp *sp); 326 static void sppp_ipv6cp_open(struct sppp *sp); 327 static void sppp_ipv6cp_close(struct sppp *sp); 328 static void sppp_ipv6cp_TO(void *sp); 329 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 330 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 331 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 332 static void sppp_ipv6cp_tlu(struct sppp *sp); 333 static void sppp_ipv6cp_tld(struct sppp *sp); 334 static void sppp_ipv6cp_tls(struct sppp *sp); 335 static void sppp_ipv6cp_tlf(struct sppp *sp); 336 static void sppp_ipv6cp_scr(struct sppp *sp); 337 338 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 339 static void sppp_pap_init(struct sppp *sp); 340 static void sppp_pap_open(struct sppp *sp); 341 static void sppp_pap_close(struct sppp *sp); 342 static void sppp_pap_TO(void *sp); 343 static void sppp_pap_my_TO(void *sp); 344 static void sppp_pap_tlu(struct sppp *sp); 345 static void sppp_pap_tld(struct sppp *sp); 346 static void sppp_pap_scr(struct sppp *sp); 347 348 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 349 static void sppp_chap_init(struct sppp *sp); 350 static void sppp_chap_open(struct sppp *sp); 351 static void sppp_chap_close(struct sppp *sp); 352 static void sppp_chap_TO(void *sp); 353 static void sppp_chap_tlu(struct sppp *sp); 354 static void sppp_chap_tld(struct sppp *sp); 355 static void sppp_chap_scr(struct sppp *sp); 356 357 static const char *sppp_auth_type_name(u_short proto, u_char type); 358 static const char *sppp_cp_type_name(u_char type); 359 static const char *sppp_dotted_quad(uint32_t addr); 360 static const char *sppp_ipcp_opt_name(u_char opt); 361 #ifdef INET6 362 static const char *sppp_ipv6cp_opt_name(u_char opt); 363 #endif 364 static const char *sppp_lcp_opt_name(u_char opt); 365 static const char *sppp_phase_name(int phase); 366 static const char *sppp_proto_name(u_short proto); 367 static const char *sppp_state_name(int state); 368 static int sppp_params(struct sppp *sp, u_long cmd, void *data); 369 #ifdef INET 370 static void sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, 371 uint32_t *srcmask); 372 static void sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr); 373 static void sppp_clear_ip_addrs(struct sppp *sp); 374 #endif 375 static void sppp_keepalive(void *dummy); 376 static void sppp_phase_network(struct sppp *sp); 377 static void sppp_print_bytes(const u_char *p, u_short len); 378 static void sppp_print_string(const char *p, u_short len); 379 #ifdef INET6 380 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 381 struct in6_addr *dst, struct in6_addr *srcmask); 382 #ifdef IPV6CP_MYIFID_DYN 383 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 384 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 385 #endif 386 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 387 #endif 388 389 /* our control protocol descriptors */ 390 static const struct cp lcp = { 391 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 392 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 393 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 394 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 395 sppp_lcp_scr 396 }; 397 398 static const struct cp ipcp = { 399 PPP_IPCP, IDX_IPCP, 400 #ifdef INET 401 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 402 #else 403 0, 404 #endif 405 "ipcp", 406 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 407 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 408 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 409 sppp_ipcp_scr 410 }; 411 412 static const struct cp ipv6cp = { 413 PPP_IPV6CP, IDX_IPV6CP, 414 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 415 CP_NCP, 416 #else 417 0, 418 #endif 419 "ipv6cp", 420 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 421 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 422 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 423 sppp_ipv6cp_scr 424 }; 425 426 static const struct cp pap = { 427 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 428 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 429 sppp_pap_TO, 0, 0, 0, 430 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 431 sppp_pap_scr 432 }; 433 434 static const struct cp chap = { 435 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 436 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 437 sppp_chap_TO, 0, 0, 0, 438 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 439 sppp_chap_scr 440 }; 441 442 static const struct cp *cps[IDX_COUNT] = { 443 &lcp, /* IDX_LCP */ 444 &ipcp, /* IDX_IPCP */ 445 &ipv6cp, /* IDX_IPV6CP */ 446 &pap, /* IDX_PAP */ 447 &chap, /* IDX_CHAP */ 448 }; 449 450 static void 451 sppp_change_phase(struct sppp *sp, int phase) 452 { 453 STDDCL; 454 455 if (sp->pp_phase == phase) 456 return; 457 458 sp->pp_phase = phase; 459 460 if (phase == SPPP_PHASE_NETWORK) 461 if_link_state_change(ifp, LINK_STATE_UP); 462 else 463 if_link_state_change(ifp, LINK_STATE_DOWN); 464 465 if (debug) 466 { 467 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 468 sppp_phase_name(sp->pp_phase)); 469 } 470 } 471 472 void spppattach(int); 473 void 474 /*ARGSUSED*/ 475 spppattach(int count) 476 { 477 } 478 479 /* 480 * Exported functions, comprising our interface to the lower layer. 481 */ 482 483 /* 484 * Process the received packet. 485 */ 486 void 487 sppp_input(struct ifnet *ifp, struct mbuf *m) 488 { 489 struct ppp_header *h = NULL; 490 pktqueue_t *pktq = NULL; 491 struct ifqueue *inq = NULL; 492 uint16_t protocol; 493 int s; 494 struct sppp *sp = (struct sppp *)ifp; 495 int debug = ifp->if_flags & IFF_DEBUG; 496 int isr = 0; 497 498 if (ifp->if_flags & IFF_UP) { 499 /* Count received bytes, add hardware framing */ 500 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 501 /* Note time of last receive */ 502 sp->pp_last_receive = time_uptime; 503 } 504 505 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 506 /* Too small packet, drop it. */ 507 if (debug) 508 log(LOG_DEBUG, 509 "%s: input packet is too small, %d bytes\n", 510 ifp->if_xname, m->m_pkthdr.len); 511 drop: 512 ++ifp->if_ierrors; 513 ++ifp->if_iqdrops; 514 m_freem(m); 515 return; 516 } 517 518 if (sp->pp_flags & PP_NOFRAMING) { 519 memcpy(&protocol, mtod(m, void *), 2); 520 protocol = ntohs(protocol); 521 m_adj(m, 2); 522 } else { 523 524 /* Get PPP header. */ 525 h = mtod(m, struct ppp_header *); 526 m_adj(m, PPP_HEADER_LEN); 527 528 switch (h->address) { 529 case PPP_ALLSTATIONS: 530 if (h->control != PPP_UI) 531 goto invalid; 532 if (sp->pp_flags & PP_CISCO) { 533 if (debug) 534 log(LOG_DEBUG, 535 "%s: PPP packet in Cisco mode " 536 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 537 ifp->if_xname, 538 h->address, h->control, ntohs(h->protocol)); 539 goto drop; 540 } 541 break; 542 case CISCO_MULTICAST: 543 case CISCO_UNICAST: 544 /* Don't check the control field here (RFC 1547). */ 545 if (! (sp->pp_flags & PP_CISCO)) { 546 if (debug) 547 log(LOG_DEBUG, 548 "%s: Cisco packet in PPP mode " 549 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 550 ifp->if_xname, 551 h->address, h->control, ntohs(h->protocol)); 552 goto drop; 553 } 554 switch (ntohs(h->protocol)) { 555 default: 556 ++ifp->if_noproto; 557 goto invalid; 558 case CISCO_KEEPALIVE: 559 sppp_cisco_input((struct sppp *) ifp, m); 560 m_freem(m); 561 return; 562 #ifdef INET 563 case ETHERTYPE_IP: 564 pktq = ip_pktq; 565 break; 566 #endif 567 #ifdef INET6 568 case ETHERTYPE_IPV6: 569 pktq = ip6_pktq; 570 break; 571 #endif 572 #ifdef IPX 573 case ETHERTYPE_IPX: 574 isr = NETISR_IPX; 575 inq = &ipxintrq; 576 break; 577 #endif 578 } 579 goto queue_pkt; 580 default: /* Invalid PPP packet. */ 581 invalid: 582 if (debug) 583 log(LOG_DEBUG, 584 "%s: invalid input packet " 585 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 586 ifp->if_xname, 587 h->address, h->control, ntohs(h->protocol)); 588 goto drop; 589 } 590 protocol = ntohs(h->protocol); 591 } 592 593 switch (protocol) { 594 default: 595 if (sp->state[IDX_LCP] == STATE_OPENED) { 596 uint16_t prot = htons(protocol); 597 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 598 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 599 &prot); 600 } 601 if (debug) 602 log(LOG_DEBUG, 603 "%s: invalid input protocol " 604 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 605 ++ifp->if_noproto; 606 goto drop; 607 case PPP_LCP: 608 sppp_cp_input(&lcp, sp, m); 609 m_freem(m); 610 return; 611 case PPP_PAP: 612 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 613 sppp_pap_input(sp, m); 614 m_freem(m); 615 return; 616 case PPP_CHAP: 617 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 618 sppp_chap_input(sp, m); 619 m_freem(m); 620 return; 621 #ifdef INET 622 case PPP_IPCP: 623 if (sp->pp_phase == SPPP_PHASE_NETWORK) 624 sppp_cp_input(&ipcp, sp, m); 625 m_freem(m); 626 return; 627 case PPP_IP: 628 if (sp->state[IDX_IPCP] == STATE_OPENED) { 629 sp->pp_last_activity = time_uptime; 630 pktq = ip_pktq; 631 } 632 break; 633 #endif 634 #ifdef INET6 635 case PPP_IPV6CP: 636 if (sp->pp_phase == SPPP_PHASE_NETWORK) 637 sppp_cp_input(&ipv6cp, sp, m); 638 m_freem(m); 639 return; 640 641 case PPP_IPV6: 642 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 643 sp->pp_last_activity = time_uptime; 644 pktq = ip6_pktq; 645 } 646 break; 647 #endif 648 #ifdef IPX 649 case PPP_IPX: 650 /* IPX IPXCP not implemented yet */ 651 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 652 isr = NETISR_IPX; 653 inq = &ipxintrq; 654 } 655 break; 656 #endif 657 } 658 659 queue_pkt: 660 if ((ifp->if_flags & IFF_UP) == 0 || (!inq && !pktq)) { 661 goto drop; 662 } 663 664 /* Check queue. */ 665 if (__predict_true(pktq)) { 666 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 667 goto drop; 668 } 669 return; 670 } 671 672 s = splnet(); 673 if (IF_QFULL(inq)) { 674 /* Queue overflow. */ 675 IF_DROP(inq); 676 splx(s); 677 if (debug) 678 log(LOG_DEBUG, "%s: protocol queue overflow\n", 679 ifp->if_xname); 680 goto drop; 681 } 682 IF_ENQUEUE(inq, m); 683 schednetisr(isr); 684 splx(s); 685 } 686 687 /* 688 * Enqueue transmit packet. 689 */ 690 static int 691 sppp_output(struct ifnet *ifp, struct mbuf *m, 692 const struct sockaddr *dst, struct rtentry *rt) 693 { 694 struct sppp *sp = (struct sppp *) ifp; 695 struct ppp_header *h = NULL; 696 struct ifqueue *ifq = NULL; /* XXX */ 697 int s, error = 0; 698 uint16_t protocol; 699 ALTQ_DECL(struct altq_pktattr pktattr;) 700 701 s = splnet(); 702 703 sp->pp_last_activity = time_uptime; 704 705 if ((ifp->if_flags & IFF_UP) == 0 || 706 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 707 m_freem(m); 708 splx(s); 709 return (ENETDOWN); 710 } 711 712 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 713 /* 714 * Interface is not yet running, but auto-dial. Need 715 * to start LCP for it. 716 */ 717 ifp->if_flags |= IFF_RUNNING; 718 splx(s); 719 lcp.Open(sp); 720 s = splnet(); 721 } 722 723 /* 724 * If the queueing discipline needs packet classification, 725 * do it before prepending link headers. 726 */ 727 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 728 729 #ifdef INET 730 if (dst->sa_family == AF_INET) { 731 struct ip *ip = NULL; 732 struct tcphdr *th = NULL; 733 734 if (m->m_len >= sizeof(struct ip)) { 735 ip = mtod(m, struct ip *); 736 if (ip->ip_p == IPPROTO_TCP && 737 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 738 sizeof(struct tcphdr)) { 739 th = (struct tcphdr *) 740 ((char *)ip + (ip->ip_hl << 2)); 741 } 742 } else 743 ip = NULL; 744 745 /* 746 * When using dynamic local IP address assignment by using 747 * 0.0.0.0 as a local address, the first TCP session will 748 * not connect because the local TCP checksum is computed 749 * using 0.0.0.0 which will later become our real IP address 750 * so the TCP checksum computed at the remote end will 751 * become invalid. So we 752 * - don't let packets with src ip addr 0 thru 753 * - we flag TCP packets with src ip 0 as an error 754 */ 755 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 756 uint8_t proto = ip->ip_p; 757 758 m_freem(m); 759 splx(s); 760 if (proto == IPPROTO_TCP) 761 return (EADDRNOTAVAIL); 762 else 763 return (0); 764 } 765 766 /* 767 * Put low delay, telnet, rlogin and ftp control packets 768 * in front of the queue. 769 */ 770 771 if (!IF_QFULL(&sp->pp_fastq) && 772 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 773 (th && (INTERACTIVE(ntohs(th->th_sport)) || 774 INTERACTIVE(ntohs(th->th_dport)))))) 775 ifq = &sp->pp_fastq; 776 } 777 #endif 778 779 #ifdef INET6 780 if (dst->sa_family == AF_INET6) { 781 /* XXX do something tricky here? */ 782 } 783 #endif 784 785 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 786 /* 787 * Prepend general data packet PPP header. For now, IP only. 788 */ 789 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 790 if (! m) { 791 if (ifp->if_flags & IFF_DEBUG) 792 log(LOG_DEBUG, "%s: no memory for transmit header\n", 793 ifp->if_xname); 794 ++ifp->if_oerrors; 795 splx(s); 796 return (ENOBUFS); 797 } 798 /* 799 * May want to check size of packet 800 * (albeit due to the implementation it's always enough) 801 */ 802 h = mtod(m, struct ppp_header *); 803 if (sp->pp_flags & PP_CISCO) { 804 h->address = CISCO_UNICAST; /* unicast address */ 805 h->control = 0; 806 } else { 807 h->address = PPP_ALLSTATIONS; /* broadcast address */ 808 h->control = PPP_UI; /* Unnumbered Info */ 809 } 810 } 811 812 switch (dst->sa_family) { 813 #ifdef INET 814 case AF_INET: /* Internet Protocol */ 815 if (sp->pp_flags & PP_CISCO) 816 protocol = htons(ETHERTYPE_IP); 817 else { 818 /* 819 * Don't choke with an ENETDOWN early. It's 820 * possible that we just started dialing out, 821 * so don't drop the packet immediately. If 822 * we notice that we run out of buffer space 823 * below, we will however remember that we are 824 * not ready to carry IP packets, and return 825 * ENETDOWN, as opposed to ENOBUFS. 826 */ 827 protocol = htons(PPP_IP); 828 if (sp->state[IDX_IPCP] != STATE_OPENED) 829 error = ENETDOWN; 830 } 831 break; 832 #endif 833 #ifdef INET6 834 case AF_INET6: /* Internet Protocol version 6 */ 835 if (sp->pp_flags & PP_CISCO) 836 protocol = htons(ETHERTYPE_IPV6); 837 else { 838 /* 839 * Don't choke with an ENETDOWN early. It's 840 * possible that we just started dialing out, 841 * so don't drop the packet immediately. If 842 * we notice that we run out of buffer space 843 * below, we will however remember that we are 844 * not ready to carry IP packets, and return 845 * ENETDOWN, as opposed to ENOBUFS. 846 */ 847 protocol = htons(PPP_IPV6); 848 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 849 error = ENETDOWN; 850 } 851 break; 852 #endif 853 #ifdef IPX 854 case AF_IPX: /* Novell IPX Protocol */ 855 protocol = htons((sp->pp_flags & PP_CISCO) ? 856 ETHERTYPE_IPX : PPP_IPX); 857 break; 858 #endif 859 default: 860 m_freem(m); 861 ++ifp->if_oerrors; 862 splx(s); 863 return (EAFNOSUPPORT); 864 } 865 866 if (sp->pp_flags & PP_NOFRAMING) { 867 M_PREPEND(m, 2, M_DONTWAIT); 868 if (m == NULL) { 869 if (ifp->if_flags & IFF_DEBUG) 870 log(LOG_DEBUG, "%s: no memory for transmit header\n", 871 ifp->if_xname); 872 ++ifp->if_oerrors; 873 splx(s); 874 return (ENOBUFS); 875 } 876 *mtod(m, uint16_t *) = protocol; 877 } else { 878 h->protocol = protocol; 879 } 880 881 882 error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 883 884 if (error == 0) { 885 /* 886 * Count output packets and bytes. 887 * The packet length includes header + additional hardware 888 * framing according to RFC 1333. 889 */ 890 if (!(ifp->if_flags & IFF_OACTIVE)) 891 (*ifp->if_start)(ifp); 892 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 893 } 894 splx(s); 895 return error; 896 } 897 898 void 899 sppp_attach(struct ifnet *ifp) 900 { 901 struct sppp *sp = (struct sppp *) ifp; 902 903 /* Initialize keepalive handler. */ 904 if (! spppq) { 905 callout_init(&keepalive_ch, 0); 906 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 907 } 908 909 /* Insert new entry into the keepalive list. */ 910 sp->pp_next = spppq; 911 spppq = sp; 912 913 sp->pp_if.if_type = IFT_PPP; 914 sp->pp_if.if_output = sppp_output; 915 sp->pp_fastq.ifq_maxlen = 32; 916 sp->pp_cpq.ifq_maxlen = 20; 917 sp->pp_loopcnt = 0; 918 sp->pp_alivecnt = 0; 919 sp->pp_last_activity = 0; 920 sp->pp_last_receive = 0; 921 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 922 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 923 sp->pp_idle_timeout = 0; 924 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 925 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 926 sp->pp_auth_failures = 0; 927 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 928 sp->pp_phase = SPPP_PHASE_DEAD; 929 sp->pp_up = lcp.Up; 930 sp->pp_down = lcp.Down; 931 932 if_alloc_sadl(ifp); 933 934 memset(&sp->myauth, 0, sizeof sp->myauth); 935 memset(&sp->hisauth, 0, sizeof sp->hisauth); 936 sppp_lcp_init(sp); 937 sppp_ipcp_init(sp); 938 sppp_ipv6cp_init(sp); 939 sppp_pap_init(sp); 940 sppp_chap_init(sp); 941 } 942 943 void 944 sppp_detach(struct ifnet *ifp) 945 { 946 struct sppp **q, *p, *sp = (struct sppp *) ifp; 947 948 /* Remove the entry from the keepalive list. */ 949 for (q = &spppq; (p = *q); q = &p->pp_next) 950 if (p == sp) { 951 *q = p->pp_next; 952 break; 953 } 954 955 /* Stop keepalive handler. */ 956 if (! spppq) { 957 callout_stop(&keepalive_ch); 958 } 959 960 callout_stop(&sp->ch[IDX_LCP]); 961 callout_stop(&sp->ch[IDX_IPCP]); 962 callout_stop(&sp->ch[IDX_PAP]); 963 callout_stop(&sp->ch[IDX_CHAP]); 964 #ifdef INET6 965 callout_stop(&sp->ch[IDX_IPV6CP]); 966 #endif 967 callout_stop(&sp->pap_my_to_ch); 968 969 /* free authentication info */ 970 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 971 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 972 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 973 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 974 975 #if 0 /* done in if_detach() */ 976 if_free_sadl(ifp); 977 #endif 978 } 979 980 /* 981 * Flush the interface output queue. 982 */ 983 void 984 sppp_flush(struct ifnet *ifp) 985 { 986 struct sppp *sp = (struct sppp *) ifp; 987 988 IFQ_PURGE(&sp->pp_if.if_snd); 989 IF_PURGE(&sp->pp_fastq); 990 IF_PURGE(&sp->pp_cpq); 991 } 992 993 /* 994 * Check if the output queue is empty. 995 */ 996 int 997 sppp_isempty(struct ifnet *ifp) 998 { 999 struct sppp *sp = (struct sppp *) ifp; 1000 int empty, s; 1001 1002 s = splnet(); 1003 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 1004 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 1005 splx(s); 1006 return (empty); 1007 } 1008 1009 /* 1010 * Get next packet to send. 1011 */ 1012 struct mbuf * 1013 sppp_dequeue(struct ifnet *ifp) 1014 { 1015 struct sppp *sp = (struct sppp *) ifp; 1016 struct mbuf *m; 1017 int s; 1018 1019 s = splnet(); 1020 /* 1021 * Process only the control protocol queue until we have at 1022 * least one NCP open. 1023 * 1024 * Do always serve all three queues in Cisco mode. 1025 */ 1026 IF_DEQUEUE(&sp->pp_cpq, m); 1027 if (m == NULL && 1028 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1029 IF_DEQUEUE(&sp->pp_fastq, m); 1030 if (m == NULL) 1031 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1032 } 1033 splx(s); 1034 return m; 1035 } 1036 1037 /* 1038 * Process an ioctl request. Called on low priority level. 1039 */ 1040 int 1041 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1042 { 1043 struct lwp *l = curlwp; /* XXX */ 1044 struct ifreq *ifr = (struct ifreq *) data; 1045 struct sppp *sp = (struct sppp *) ifp; 1046 int s, error=0, going_up, going_down, newmode; 1047 1048 s = splnet(); 1049 switch (cmd) { 1050 case SIOCINITIFADDR: 1051 break; 1052 1053 case SIOCSIFFLAGS: 1054 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1055 break; 1056 going_up = ifp->if_flags & IFF_UP && 1057 (ifp->if_flags & IFF_RUNNING) == 0; 1058 going_down = (ifp->if_flags & IFF_UP) == 0 && 1059 ifp->if_flags & IFF_RUNNING; 1060 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1061 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1062 /* sanity */ 1063 newmode = IFF_PASSIVE; 1064 ifp->if_flags &= ~IFF_AUTO; 1065 } 1066 1067 if (going_up || going_down) 1068 lcp.Close(sp); 1069 if (going_up && newmode == 0) { 1070 /* neither auto-dial nor passive */ 1071 ifp->if_flags |= IFF_RUNNING; 1072 if (!(sp->pp_flags & PP_CISCO)) 1073 lcp.Open(sp); 1074 } else if (going_down) { 1075 sppp_flush(ifp); 1076 ifp->if_flags &= ~IFF_RUNNING; 1077 } 1078 1079 break; 1080 1081 case SIOCSIFMTU: 1082 if (ifr->ifr_mtu < PPP_MINMRU || 1083 ifr->ifr_mtu > sp->lcp.their_mru) { 1084 error = EINVAL; 1085 break; 1086 } 1087 /*FALLTHROUGH*/ 1088 case SIOCGIFMTU: 1089 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1090 error = 0; 1091 break; 1092 case SIOCADDMULTI: 1093 case SIOCDELMULTI: 1094 break; 1095 1096 case SPPPSETAUTHCFG: 1097 case SPPPSETLCPCFG: 1098 case SPPPSETIDLETO: 1099 case SPPPSETAUTHFAILURE: 1100 case SPPPSETDNSOPTS: 1101 case SPPPSETKEEPALIVE: 1102 #if defined(COMPAT_50) || defined(MODULAR) 1103 case __SPPPSETIDLETO50: 1104 case __SPPPSETKEEPALIVE50: 1105 #endif /* COMPAT_50 || MODULAR */ 1106 error = kauth_authorize_network(l->l_cred, 1107 KAUTH_NETWORK_INTERFACE, 1108 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1109 NULL); 1110 if (error) 1111 break; 1112 error = sppp_params(sp, cmd, data); 1113 break; 1114 1115 case SPPPGETAUTHCFG: 1116 case SPPPGETLCPCFG: 1117 case SPPPGETAUTHFAILURES: 1118 error = kauth_authorize_network(l->l_cred, 1119 KAUTH_NETWORK_INTERFACE, 1120 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1121 NULL); 1122 if (error) 1123 break; 1124 error = sppp_params(sp, cmd, data); 1125 break; 1126 1127 case SPPPGETSTATUS: 1128 case SPPPGETSTATUSNCP: 1129 case SPPPGETIDLETO: 1130 case SPPPGETDNSOPTS: 1131 case SPPPGETDNSADDRS: 1132 case SPPPGETKEEPALIVE: 1133 #if defined(COMPAT_50) || defined(MODULAR) 1134 case __SPPPGETIDLETO50: 1135 case __SPPPGETKEEPALIVE50: 1136 #endif /* COMPAT_50 || MODULAR */ 1137 error = sppp_params(sp, cmd, data); 1138 break; 1139 1140 default: 1141 error = ifioctl_common(ifp, cmd, data); 1142 break; 1143 } 1144 splx(s); 1145 return (error); 1146 } 1147 1148 1149 /* 1150 * Cisco framing implementation. 1151 */ 1152 1153 /* 1154 * Handle incoming Cisco keepalive protocol packets. 1155 */ 1156 static void 1157 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1158 { 1159 STDDCL; 1160 struct cisco_packet *h; 1161 #ifdef INET 1162 uint32_t me, mymask = 0; /* XXX: GCC */ 1163 #endif 1164 1165 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1166 if (debug) 1167 log(LOG_DEBUG, 1168 "%s: cisco invalid packet length: %d bytes\n", 1169 ifp->if_xname, m->m_pkthdr.len); 1170 return; 1171 } 1172 h = mtod(m, struct cisco_packet *); 1173 if (debug) 1174 log(LOG_DEBUG, 1175 "%s: cisco input: %d bytes " 1176 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1177 ifp->if_xname, m->m_pkthdr.len, 1178 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1179 (u_int)h->time0, (u_int)h->time1); 1180 switch (ntohl(h->type)) { 1181 default: 1182 if (debug) 1183 addlog("%s: cisco unknown packet type: 0x%x\n", 1184 ifp->if_xname, ntohl(h->type)); 1185 break; 1186 case CISCO_ADDR_REPLY: 1187 /* Reply on address request, ignore */ 1188 break; 1189 case CISCO_KEEPALIVE_REQ: 1190 sp->pp_alivecnt = 0; 1191 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1192 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1193 /* Local and remote sequence numbers are equal. 1194 * Probably, the line is in loopback mode. */ 1195 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1196 printf ("%s: loopback\n", 1197 ifp->if_xname); 1198 sp->pp_loopcnt = 0; 1199 if (ifp->if_flags & IFF_UP) { 1200 if_down(ifp); 1201 IF_PURGE(&sp->pp_cpq); 1202 } 1203 } 1204 ++sp->pp_loopcnt; 1205 1206 /* Generate new local sequence number */ 1207 sp->pp_seq[IDX_LCP] = cprng_fast32(); 1208 break; 1209 } 1210 sp->pp_loopcnt = 0; 1211 if (! (ifp->if_flags & IFF_UP) && 1212 (ifp->if_flags & IFF_RUNNING)) { 1213 if_up(ifp); 1214 } 1215 break; 1216 case CISCO_ADDR_REQ: 1217 #ifdef INET 1218 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1219 if (me != 0L) 1220 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1221 #endif 1222 break; 1223 } 1224 } 1225 1226 /* 1227 * Send Cisco keepalive packet. 1228 */ 1229 static void 1230 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1231 { 1232 STDDCL; 1233 struct ppp_header *h; 1234 struct cisco_packet *ch; 1235 struct mbuf *m; 1236 uint32_t t; 1237 1238 t = time_uptime * 1000; 1239 MGETHDR(m, M_DONTWAIT, MT_DATA); 1240 if (! m) 1241 return; 1242 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1243 m->m_pkthdr.rcvif = 0; 1244 1245 h = mtod(m, struct ppp_header *); 1246 h->address = CISCO_MULTICAST; 1247 h->control = 0; 1248 h->protocol = htons(CISCO_KEEPALIVE); 1249 1250 ch = (struct cisco_packet *)(h + 1); 1251 ch->type = htonl(type); 1252 ch->par1 = htonl(par1); 1253 ch->par2 = htonl(par2); 1254 ch->rel = -1; 1255 1256 ch->time0 = htons((u_short)(t >> 16)); 1257 ch->time1 = htons((u_short) t); 1258 1259 if (debug) 1260 log(LOG_DEBUG, 1261 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1262 ifp->if_xname, ntohl(ch->type), ch->par1, 1263 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1264 (u_int)ch->time1); 1265 1266 if (IF_QFULL(&sp->pp_cpq)) { 1267 IF_DROP(&sp->pp_fastq); 1268 IF_DROP(&ifp->if_snd); 1269 m_freem(m); 1270 ++ifp->if_oerrors; 1271 return; 1272 } else 1273 IF_ENQUEUE(&sp->pp_cpq, m); 1274 if (! (ifp->if_flags & IFF_OACTIVE)) 1275 (*ifp->if_start)(ifp); 1276 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1277 } 1278 1279 /* 1280 * PPP protocol implementation. 1281 */ 1282 1283 /* 1284 * Send PPP control protocol packet. 1285 */ 1286 static void 1287 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1288 u_char ident, u_short len, void *data) 1289 { 1290 STDDCL; 1291 struct lcp_header *lh; 1292 struct mbuf *m; 1293 size_t pkthdrlen; 1294 1295 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1296 1297 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1298 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1299 MGETHDR(m, M_DONTWAIT, MT_DATA); 1300 if (! m) 1301 return; 1302 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1303 m->m_pkthdr.rcvif = 0; 1304 1305 if (sp->pp_flags & PP_NOFRAMING) { 1306 *mtod(m, uint16_t *) = htons(proto); 1307 lh = (struct lcp_header *)(mtod(m, uint8_t *) + 2); 1308 } else { 1309 struct ppp_header *h; 1310 h = mtod(m, struct ppp_header *); 1311 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1312 h->control = PPP_UI; /* Unnumbered Info */ 1313 h->protocol = htons(proto); /* Link Control Protocol */ 1314 lh = (struct lcp_header *)(h + 1); 1315 } 1316 lh->type = type; 1317 lh->ident = ident; 1318 lh->len = htons(LCP_HEADER_LEN + len); 1319 if (len) 1320 bcopy (data, lh + 1, len); 1321 1322 if (debug) { 1323 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1324 ifp->if_xname, 1325 sppp_proto_name(proto), 1326 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1327 if (len) 1328 sppp_print_bytes((u_char *)(lh + 1), len); 1329 addlog(">\n"); 1330 } 1331 if (IF_QFULL(&sp->pp_cpq)) { 1332 IF_DROP(&sp->pp_fastq); 1333 IF_DROP(&ifp->if_snd); 1334 m_freem(m); 1335 ++ifp->if_oerrors; 1336 return; 1337 } else 1338 IF_ENQUEUE(&sp->pp_cpq, m); 1339 if (! (ifp->if_flags & IFF_OACTIVE)) 1340 (*ifp->if_start)(ifp); 1341 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1342 } 1343 1344 /* 1345 * Handle incoming PPP control protocol packets. 1346 */ 1347 static void 1348 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1349 { 1350 STDDCL; 1351 struct lcp_header *h; 1352 int printlen, len = m->m_pkthdr.len; 1353 int rv; 1354 u_char *p; 1355 uint32_t u32; 1356 1357 if (len < 4) { 1358 if (debug) 1359 log(LOG_DEBUG, 1360 "%s: %s invalid packet length: %d bytes\n", 1361 ifp->if_xname, cp->name, len); 1362 return; 1363 } 1364 h = mtod(m, struct lcp_header *); 1365 if (debug) { 1366 printlen = ntohs(h->len); 1367 log(LOG_DEBUG, 1368 "%s: %s input(%s): <%s id=0x%x len=%d", 1369 ifp->if_xname, cp->name, 1370 sppp_state_name(sp->state[cp->protoidx]), 1371 sppp_cp_type_name(h->type), h->ident, printlen); 1372 if (len < printlen) 1373 printlen = len; 1374 if (printlen > 4) 1375 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1376 addlog(">\n"); 1377 } 1378 if (len > ntohs(h->len)) 1379 len = ntohs(h->len); 1380 p = (u_char *)(h + 1); 1381 switch (h->type) { 1382 case CONF_REQ: 1383 if (len < 4) { 1384 if (debug) 1385 addlog("%s: %s invalid conf-req length %d\n", 1386 ifp->if_xname, cp->name, 1387 len); 1388 ++ifp->if_ierrors; 1389 break; 1390 } 1391 /* handle states where RCR doesn't get a SCA/SCN */ 1392 switch (sp->state[cp->protoidx]) { 1393 case STATE_CLOSING: 1394 case STATE_STOPPING: 1395 return; 1396 case STATE_CLOSED: 1397 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1398 0, 0); 1399 return; 1400 } 1401 rv = (cp->RCR)(sp, h, len); 1402 if (rv < 0) { 1403 /* fatal error, shut down */ 1404 (cp->tld)(sp); 1405 sppp_lcp_tlf(sp); 1406 return; 1407 } 1408 switch (sp->state[cp->protoidx]) { 1409 case STATE_OPENED: 1410 (cp->tld)(sp); 1411 (cp->scr)(sp); 1412 /* fall through... */ 1413 case STATE_ACK_SENT: 1414 case STATE_REQ_SENT: 1415 sppp_cp_change_state(cp, sp, rv? 1416 STATE_ACK_SENT: STATE_REQ_SENT); 1417 break; 1418 case STATE_STOPPED: 1419 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1420 (cp->scr)(sp); 1421 sppp_cp_change_state(cp, sp, rv? 1422 STATE_ACK_SENT: STATE_REQ_SENT); 1423 break; 1424 case STATE_ACK_RCVD: 1425 if (rv) { 1426 sppp_cp_change_state(cp, sp, STATE_OPENED); 1427 if (debug) 1428 log(LOG_DEBUG, "%s: %s tlu\n", 1429 ifp->if_xname, 1430 cp->name); 1431 (cp->tlu)(sp); 1432 } else 1433 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1434 break; 1435 default: 1436 printf("%s: %s illegal %s in state %s\n", 1437 ifp->if_xname, cp->name, 1438 sppp_cp_type_name(h->type), 1439 sppp_state_name(sp->state[cp->protoidx])); 1440 ++ifp->if_ierrors; 1441 } 1442 break; 1443 case CONF_ACK: 1444 if (h->ident != sp->confid[cp->protoidx]) { 1445 if (debug) 1446 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1447 ifp->if_xname, cp->name, 1448 h->ident, sp->confid[cp->protoidx]); 1449 ++ifp->if_ierrors; 1450 break; 1451 } 1452 switch (sp->state[cp->protoidx]) { 1453 case STATE_CLOSED: 1454 case STATE_STOPPED: 1455 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1456 break; 1457 case STATE_CLOSING: 1458 case STATE_STOPPING: 1459 break; 1460 case STATE_REQ_SENT: 1461 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1462 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1463 break; 1464 case STATE_OPENED: 1465 (cp->tld)(sp); 1466 /* fall through */ 1467 case STATE_ACK_RCVD: 1468 (cp->scr)(sp); 1469 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1470 break; 1471 case STATE_ACK_SENT: 1472 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1473 sppp_cp_change_state(cp, sp, STATE_OPENED); 1474 if (debug) 1475 log(LOG_DEBUG, "%s: %s tlu\n", 1476 ifp->if_xname, cp->name); 1477 (cp->tlu)(sp); 1478 break; 1479 default: 1480 printf("%s: %s illegal %s in state %s\n", 1481 ifp->if_xname, cp->name, 1482 sppp_cp_type_name(h->type), 1483 sppp_state_name(sp->state[cp->protoidx])); 1484 ++ifp->if_ierrors; 1485 } 1486 break; 1487 case CONF_NAK: 1488 case CONF_REJ: 1489 if (h->ident != sp->confid[cp->protoidx]) { 1490 if (debug) 1491 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1492 ifp->if_xname, cp->name, 1493 h->ident, sp->confid[cp->protoidx]); 1494 ++ifp->if_ierrors; 1495 break; 1496 } 1497 if (h->type == CONF_NAK) 1498 (cp->RCN_nak)(sp, h, len); 1499 else /* CONF_REJ */ 1500 (cp->RCN_rej)(sp, h, len); 1501 1502 switch (sp->state[cp->protoidx]) { 1503 case STATE_CLOSED: 1504 case STATE_STOPPED: 1505 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1506 break; 1507 case STATE_REQ_SENT: 1508 case STATE_ACK_SENT: 1509 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1510 (cp->scr)(sp); 1511 break; 1512 case STATE_OPENED: 1513 (cp->tld)(sp); 1514 /* fall through */ 1515 case STATE_ACK_RCVD: 1516 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1517 (cp->scr)(sp); 1518 break; 1519 case STATE_CLOSING: 1520 case STATE_STOPPING: 1521 break; 1522 default: 1523 printf("%s: %s illegal %s in state %s\n", 1524 ifp->if_xname, cp->name, 1525 sppp_cp_type_name(h->type), 1526 sppp_state_name(sp->state[cp->protoidx])); 1527 ++ifp->if_ierrors; 1528 } 1529 break; 1530 1531 case TERM_REQ: 1532 switch (sp->state[cp->protoidx]) { 1533 case STATE_ACK_RCVD: 1534 case STATE_ACK_SENT: 1535 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1536 /* fall through */ 1537 case STATE_CLOSED: 1538 case STATE_STOPPED: 1539 case STATE_CLOSING: 1540 case STATE_STOPPING: 1541 case STATE_REQ_SENT: 1542 sta: 1543 /* Send Terminate-Ack packet. */ 1544 if (debug) 1545 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1546 ifp->if_xname, cp->name); 1547 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1548 break; 1549 case STATE_OPENED: 1550 (cp->tld)(sp); 1551 sp->rst_counter[cp->protoidx] = 0; 1552 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1553 goto sta; 1554 default: 1555 printf("%s: %s illegal %s in state %s\n", 1556 ifp->if_xname, cp->name, 1557 sppp_cp_type_name(h->type), 1558 sppp_state_name(sp->state[cp->protoidx])); 1559 ++ifp->if_ierrors; 1560 } 1561 break; 1562 case TERM_ACK: 1563 switch (sp->state[cp->protoidx]) { 1564 case STATE_CLOSED: 1565 case STATE_STOPPED: 1566 case STATE_REQ_SENT: 1567 case STATE_ACK_SENT: 1568 break; 1569 case STATE_CLOSING: 1570 (cp->tlf)(sp); 1571 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1572 sppp_lcp_check_and_close(sp); 1573 break; 1574 case STATE_STOPPING: 1575 (cp->tlf)(sp); 1576 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1577 sppp_lcp_check_and_close(sp); 1578 break; 1579 case STATE_ACK_RCVD: 1580 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1581 break; 1582 case STATE_OPENED: 1583 (cp->tld)(sp); 1584 (cp->scr)(sp); 1585 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1586 break; 1587 default: 1588 printf("%s: %s illegal %s in state %s\n", 1589 ifp->if_xname, cp->name, 1590 sppp_cp_type_name(h->type), 1591 sppp_state_name(sp->state[cp->protoidx])); 1592 ++ifp->if_ierrors; 1593 } 1594 break; 1595 case CODE_REJ: 1596 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1597 log(LOG_INFO, 1598 "%s: %s: ignoring RXJ (%s) for code ?, " 1599 "danger will robinson\n", 1600 ifp->if_xname, cp->name, 1601 sppp_cp_type_name(h->type)); 1602 switch (sp->state[cp->protoidx]) { 1603 case STATE_CLOSED: 1604 case STATE_STOPPED: 1605 case STATE_REQ_SENT: 1606 case STATE_ACK_SENT: 1607 case STATE_CLOSING: 1608 case STATE_STOPPING: 1609 case STATE_OPENED: 1610 break; 1611 case STATE_ACK_RCVD: 1612 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1613 break; 1614 default: 1615 printf("%s: %s illegal %s in state %s\n", 1616 ifp->if_xname, cp->name, 1617 sppp_cp_type_name(h->type), 1618 sppp_state_name(sp->state[cp->protoidx])); 1619 ++ifp->if_ierrors; 1620 } 1621 break; 1622 case PROTO_REJ: 1623 { 1624 int catastrophic; 1625 const struct cp *upper; 1626 int i; 1627 uint16_t proto; 1628 1629 catastrophic = 0; 1630 upper = NULL; 1631 proto = p[0] << 8 | p[1]; 1632 for (i = 0; i < IDX_COUNT; i++) { 1633 if (cps[i]->proto == proto) { 1634 upper = cps[i]; 1635 break; 1636 } 1637 } 1638 if (upper == NULL) 1639 catastrophic++; 1640 1641 if (debug) 1642 log(LOG_INFO, 1643 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1644 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1645 sppp_cp_type_name(h->type), proto, 1646 upper ? upper->name : "unknown", 1647 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1648 1649 /* 1650 * if we got RXJ+ against conf-req, the peer does not implement 1651 * this particular protocol type. terminate the protocol. 1652 */ 1653 if (upper && !catastrophic) { 1654 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1655 upper->Close(sp); 1656 break; 1657 } 1658 } 1659 1660 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1661 switch (sp->state[cp->protoidx]) { 1662 case STATE_CLOSED: 1663 case STATE_STOPPED: 1664 case STATE_REQ_SENT: 1665 case STATE_ACK_SENT: 1666 case STATE_CLOSING: 1667 case STATE_STOPPING: 1668 case STATE_OPENED: 1669 break; 1670 case STATE_ACK_RCVD: 1671 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1672 break; 1673 default: 1674 printf("%s: %s illegal %s in state %s\n", 1675 ifp->if_xname, cp->name, 1676 sppp_cp_type_name(h->type), 1677 sppp_state_name(sp->state[cp->protoidx])); 1678 ++ifp->if_ierrors; 1679 } 1680 break; 1681 } 1682 case DISC_REQ: 1683 if (cp->proto != PPP_LCP) 1684 goto illegal; 1685 /* Discard the packet. */ 1686 break; 1687 case ECHO_REQ: 1688 if (cp->proto != PPP_LCP) 1689 goto illegal; 1690 if (sp->state[cp->protoidx] != STATE_OPENED) { 1691 if (debug) 1692 addlog("%s: lcp echo req but lcp closed\n", 1693 ifp->if_xname); 1694 ++ifp->if_ierrors; 1695 break; 1696 } 1697 if (len < 8) { 1698 if (debug) 1699 addlog("%s: invalid lcp echo request " 1700 "packet length: %d bytes\n", 1701 ifp->if_xname, len); 1702 break; 1703 } 1704 memcpy(&u32, h + 1, sizeof u32); 1705 if (ntohl(u32) == sp->lcp.magic) { 1706 /* Line loopback mode detected. */ 1707 printf("%s: loopback\n", ifp->if_xname); 1708 if_down(ifp); 1709 IF_PURGE(&sp->pp_cpq); 1710 1711 /* Shut down the PPP link. */ 1712 /* XXX */ 1713 lcp.Down(sp); 1714 lcp.Up(sp); 1715 break; 1716 } 1717 u32 = htonl(sp->lcp.magic); 1718 memcpy(h + 1, &u32, sizeof u32); 1719 if (debug) 1720 addlog("%s: got lcp echo req, sending echo rep\n", 1721 ifp->if_xname); 1722 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1723 h + 1); 1724 break; 1725 case ECHO_REPLY: 1726 if (cp->proto != PPP_LCP) 1727 goto illegal; 1728 if (h->ident != sp->lcp.echoid) { 1729 ++ifp->if_ierrors; 1730 break; 1731 } 1732 if (len < 8) { 1733 if (debug) 1734 addlog("%s: lcp invalid echo reply " 1735 "packet length: %d bytes\n", 1736 ifp->if_xname, len); 1737 break; 1738 } 1739 if (debug) 1740 addlog("%s: lcp got echo rep\n", 1741 ifp->if_xname); 1742 memcpy(&u32, h + 1, sizeof u32); 1743 if (ntohl(u32) != sp->lcp.magic) 1744 sp->pp_alivecnt = 0; 1745 break; 1746 default: 1747 /* Unknown packet type -- send Code-Reject packet. */ 1748 illegal: 1749 if (debug) 1750 addlog("%s: %s send code-rej for 0x%x\n", 1751 ifp->if_xname, cp->name, h->type); 1752 sppp_cp_send(sp, cp->proto, CODE_REJ, 1753 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1754 ++ifp->if_ierrors; 1755 } 1756 } 1757 1758 1759 /* 1760 * The generic part of all Up/Down/Open/Close/TO event handlers. 1761 * Basically, the state transition handling in the automaton. 1762 */ 1763 static void 1764 sppp_up_event(const struct cp *cp, struct sppp *sp) 1765 { 1766 STDDCL; 1767 1768 if (debug) 1769 log(LOG_DEBUG, "%s: %s up(%s)\n", 1770 ifp->if_xname, cp->name, 1771 sppp_state_name(sp->state[cp->protoidx])); 1772 1773 switch (sp->state[cp->protoidx]) { 1774 case STATE_INITIAL: 1775 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1776 break; 1777 case STATE_STARTING: 1778 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1779 (cp->scr)(sp); 1780 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1781 break; 1782 default: 1783 printf("%s: %s illegal up in state %s\n", 1784 ifp->if_xname, cp->name, 1785 sppp_state_name(sp->state[cp->protoidx])); 1786 } 1787 } 1788 1789 static void 1790 sppp_down_event(const struct cp *cp, struct sppp *sp) 1791 { 1792 STDDCL; 1793 1794 if (debug) 1795 log(LOG_DEBUG, "%s: %s down(%s)\n", 1796 ifp->if_xname, cp->name, 1797 sppp_state_name(sp->state[cp->protoidx])); 1798 1799 switch (sp->state[cp->protoidx]) { 1800 case STATE_CLOSED: 1801 case STATE_CLOSING: 1802 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1803 break; 1804 case STATE_STOPPED: 1805 (cp->tls)(sp); 1806 /* fall through */ 1807 case STATE_STOPPING: 1808 case STATE_REQ_SENT: 1809 case STATE_ACK_RCVD: 1810 case STATE_ACK_SENT: 1811 sppp_cp_change_state(cp, sp, STATE_STARTING); 1812 break; 1813 case STATE_OPENED: 1814 (cp->tld)(sp); 1815 sppp_cp_change_state(cp, sp, STATE_STARTING); 1816 break; 1817 default: 1818 printf("%s: %s illegal down in state %s\n", 1819 ifp->if_xname, cp->name, 1820 sppp_state_name(sp->state[cp->protoidx])); 1821 } 1822 } 1823 1824 1825 static void 1826 sppp_open_event(const struct cp *cp, struct sppp *sp) 1827 { 1828 STDDCL; 1829 1830 if (debug) 1831 log(LOG_DEBUG, "%s: %s open(%s)\n", 1832 ifp->if_xname, cp->name, 1833 sppp_state_name(sp->state[cp->protoidx])); 1834 1835 switch (sp->state[cp->protoidx]) { 1836 case STATE_INITIAL: 1837 sppp_cp_change_state(cp, sp, STATE_STARTING); 1838 (cp->tls)(sp); 1839 break; 1840 case STATE_STARTING: 1841 break; 1842 case STATE_CLOSED: 1843 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1844 (cp->scr)(sp); 1845 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1846 break; 1847 case STATE_STOPPED: 1848 case STATE_STOPPING: 1849 case STATE_REQ_SENT: 1850 case STATE_ACK_RCVD: 1851 case STATE_ACK_SENT: 1852 case STATE_OPENED: 1853 break; 1854 case STATE_CLOSING: 1855 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1856 break; 1857 } 1858 } 1859 1860 1861 static void 1862 sppp_close_event(const struct cp *cp, struct sppp *sp) 1863 { 1864 STDDCL; 1865 1866 if (debug) 1867 log(LOG_DEBUG, "%s: %s close(%s)\n", 1868 ifp->if_xname, cp->name, 1869 sppp_state_name(sp->state[cp->protoidx])); 1870 1871 switch (sp->state[cp->protoidx]) { 1872 case STATE_INITIAL: 1873 case STATE_CLOSED: 1874 case STATE_CLOSING: 1875 break; 1876 case STATE_STARTING: 1877 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1878 (cp->tlf)(sp); 1879 break; 1880 case STATE_STOPPED: 1881 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1882 break; 1883 case STATE_STOPPING: 1884 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1885 break; 1886 case STATE_OPENED: 1887 (cp->tld)(sp); 1888 /* fall through */ 1889 case STATE_REQ_SENT: 1890 case STATE_ACK_RCVD: 1891 case STATE_ACK_SENT: 1892 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1893 sppp_cp_send(sp, cp->proto, TERM_REQ, 1894 ++sp->pp_seq[cp->protoidx], 0, 0); 1895 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1896 break; 1897 } 1898 } 1899 1900 static void 1901 sppp_to_event(const struct cp *cp, struct sppp *sp) 1902 { 1903 STDDCL; 1904 int s; 1905 1906 s = splnet(); 1907 if (debug) 1908 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1909 ifp->if_xname, cp->name, 1910 sppp_state_name(sp->state[cp->protoidx]), 1911 sp->rst_counter[cp->protoidx]); 1912 1913 if (--sp->rst_counter[cp->protoidx] < 0) 1914 /* TO- event */ 1915 switch (sp->state[cp->protoidx]) { 1916 case STATE_CLOSING: 1917 (cp->tlf)(sp); 1918 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1919 sppp_lcp_check_and_close(sp); 1920 break; 1921 case STATE_STOPPING: 1922 (cp->tlf)(sp); 1923 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1924 sppp_lcp_check_and_close(sp); 1925 break; 1926 case STATE_REQ_SENT: 1927 case STATE_ACK_RCVD: 1928 case STATE_ACK_SENT: 1929 (cp->tlf)(sp); 1930 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1931 sppp_lcp_check_and_close(sp); 1932 break; 1933 } 1934 else 1935 /* TO+ event */ 1936 switch (sp->state[cp->protoidx]) { 1937 case STATE_CLOSING: 1938 case STATE_STOPPING: 1939 sppp_cp_send(sp, cp->proto, TERM_REQ, 1940 ++sp->pp_seq[cp->protoidx], 0, 0); 1941 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1942 cp->TO, sp); 1943 break; 1944 case STATE_REQ_SENT: 1945 case STATE_ACK_RCVD: 1946 (cp->scr)(sp); 1947 /* sppp_cp_change_state() will restart the timer */ 1948 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1949 break; 1950 case STATE_ACK_SENT: 1951 (cp->scr)(sp); 1952 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1953 cp->TO, sp); 1954 break; 1955 } 1956 1957 splx(s); 1958 } 1959 1960 /* 1961 * Change the state of a control protocol in the state automaton. 1962 * Takes care of starting/stopping the restart timer. 1963 */ 1964 void 1965 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1966 { 1967 sp->state[cp->protoidx] = newstate; 1968 callout_stop(&sp->ch[cp->protoidx]); 1969 switch (newstate) { 1970 case STATE_INITIAL: 1971 case STATE_STARTING: 1972 case STATE_CLOSED: 1973 case STATE_STOPPED: 1974 case STATE_OPENED: 1975 break; 1976 case STATE_CLOSING: 1977 case STATE_STOPPING: 1978 case STATE_REQ_SENT: 1979 case STATE_ACK_RCVD: 1980 case STATE_ACK_SENT: 1981 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1982 cp->TO, sp); 1983 break; 1984 } 1985 } 1986 1987 /* 1988 *--------------------------------------------------------------------------* 1989 * * 1990 * The LCP implementation. * 1991 * * 1992 *--------------------------------------------------------------------------* 1993 */ 1994 static void 1995 sppp_lcp_init(struct sppp *sp) 1996 { 1997 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1998 sp->lcp.magic = 0; 1999 sp->state[IDX_LCP] = STATE_INITIAL; 2000 sp->fail_counter[IDX_LCP] = 0; 2001 sp->pp_seq[IDX_LCP] = 0; 2002 sp->pp_rseq[IDX_LCP] = 0; 2003 sp->lcp.protos = 0; 2004 2005 /* 2006 * Initialize counters and timeout values. Note that we don't 2007 * use the 3 seconds suggested in RFC 1661 since we are likely 2008 * running on a fast link. XXX We should probably implement 2009 * the exponential backoff option. Note that these values are 2010 * relevant for all control protocols, not just LCP only. 2011 */ 2012 sp->lcp.timeout = 1 * hz; 2013 sp->lcp.max_terminate = 2; 2014 sp->lcp.max_configure = 10; 2015 sp->lcp.max_failure = 10; 2016 callout_init(&sp->ch[IDX_LCP], 0); 2017 } 2018 2019 static void 2020 sppp_lcp_up(struct sppp *sp) 2021 { 2022 STDDCL; 2023 2024 /* Initialize activity timestamp: opening a connection is an activity */ 2025 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 2026 2027 /* 2028 * If this interface is passive or dial-on-demand, and we are 2029 * still in Initial state, it means we've got an incoming 2030 * call. Activate the interface. 2031 */ 2032 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2033 if (debug) 2034 log(LOG_DEBUG, 2035 "%s: Up event", ifp->if_xname); 2036 ifp->if_flags |= IFF_RUNNING; 2037 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2038 if (debug) 2039 addlog("(incoming call)\n"); 2040 sp->pp_flags |= PP_CALLIN; 2041 lcp.Open(sp); 2042 } else if (debug) 2043 addlog("\n"); 2044 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2045 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2046 ifp->if_flags |= IFF_RUNNING; 2047 lcp.Open(sp); 2048 } 2049 2050 sppp_up_event(&lcp, sp); 2051 } 2052 2053 static void 2054 sppp_lcp_down(struct sppp *sp) 2055 { 2056 STDDCL; 2057 2058 sppp_down_event(&lcp, sp); 2059 2060 /* 2061 * If this is neither a dial-on-demand nor a passive 2062 * interface, simulate an ``ifconfig down'' action, so the 2063 * administrator can force a redial by another ``ifconfig 2064 * up''. XXX For leased line operation, should we immediately 2065 * try to reopen the connection here? 2066 */ 2067 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2068 if (debug) 2069 log(LOG_INFO, 2070 "%s: Down event (carrier loss), taking interface down.\n", 2071 ifp->if_xname); 2072 if_down(ifp); 2073 } else { 2074 if (debug) 2075 log(LOG_DEBUG, 2076 "%s: Down event (carrier loss)\n", 2077 ifp->if_xname); 2078 } 2079 sp->pp_flags &= ~PP_CALLIN; 2080 if (sp->state[IDX_LCP] != STATE_INITIAL) 2081 lcp.Close(sp); 2082 ifp->if_flags &= ~IFF_RUNNING; 2083 } 2084 2085 static void 2086 sppp_lcp_open(struct sppp *sp) 2087 { 2088 if (sp->pp_if.if_mtu < PP_MTU) { 2089 sp->lcp.mru = sp->pp_if.if_mtu; 2090 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2091 } else 2092 sp->lcp.mru = PP_MTU; 2093 sp->lcp.their_mru = PP_MTU; 2094 2095 /* 2096 * If we are authenticator, negotiate LCP_AUTH 2097 */ 2098 if (sp->hisauth.proto != 0) 2099 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2100 else 2101 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2102 sp->pp_flags &= ~PP_NEEDAUTH; 2103 sppp_open_event(&lcp, sp); 2104 } 2105 2106 static void 2107 sppp_lcp_close(struct sppp *sp) 2108 { 2109 sppp_close_event(&lcp, sp); 2110 } 2111 2112 static void 2113 sppp_lcp_TO(void *cookie) 2114 { 2115 sppp_to_event(&lcp, (struct sppp *)cookie); 2116 } 2117 2118 /* 2119 * Analyze a configure request. Return true if it was agreeable, and 2120 * caused action sca, false if it has been rejected or nak'ed, and 2121 * caused action scn. (The return value is used to make the state 2122 * transition decision in the state automaton.) 2123 */ 2124 static int 2125 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2126 { 2127 STDDCL; 2128 u_char *buf, *r, *p; 2129 int origlen, rlen; 2130 uint32_t nmagic; 2131 u_short authproto; 2132 2133 len -= 4; 2134 origlen = len; 2135 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2136 if (! buf) 2137 return (0); 2138 2139 if (debug) 2140 log(LOG_DEBUG, "%s: lcp parse opts:", 2141 ifp->if_xname); 2142 2143 /* pass 1: check for things that need to be rejected */ 2144 p = (void *)(h + 1); 2145 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2146 /* Sanity check option length */ 2147 if (p[1] > len) { 2148 /* 2149 * Malicious option - drop immediately. 2150 * XXX Maybe we should just RXJ it? 2151 */ 2152 addlog("%s: received malicious LCP option 0x%02x, " 2153 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2154 p[0], p[1], len); 2155 goto drop; 2156 } 2157 if (debug) 2158 addlog(" %s", sppp_lcp_opt_name(*p)); 2159 switch (*p) { 2160 case LCP_OPT_MAGIC: 2161 /* Magic number. */ 2162 /* fall through, both are same length */ 2163 case LCP_OPT_ASYNC_MAP: 2164 /* Async control character map. */ 2165 if (len >= 6 || p[1] == 6) 2166 continue; 2167 if (debug) 2168 addlog(" [invalid]"); 2169 break; 2170 case LCP_OPT_MRU: 2171 /* Maximum receive unit. */ 2172 if (len >= 4 && p[1] == 4) 2173 continue; 2174 if (debug) 2175 addlog(" [invalid]"); 2176 break; 2177 case LCP_OPT_AUTH_PROTO: 2178 if (len < 4) { 2179 if (debug) 2180 addlog(" [invalid]"); 2181 break; 2182 } 2183 authproto = (p[2] << 8) + p[3]; 2184 if (authproto == PPP_CHAP && p[1] != 5) { 2185 if (debug) 2186 addlog(" [invalid chap len]"); 2187 break; 2188 } 2189 if (sp->myauth.proto == 0) { 2190 /* we are not configured to do auth */ 2191 if (debug) 2192 addlog(" [not configured]"); 2193 break; 2194 } 2195 /* 2196 * Remote want us to authenticate, remember this, 2197 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2198 * up. 2199 */ 2200 sp->pp_flags |= PP_NEEDAUTH; 2201 continue; 2202 default: 2203 /* Others not supported. */ 2204 if (debug) 2205 addlog(" [rej]"); 2206 break; 2207 } 2208 /* Add the option to rejected list. */ 2209 bcopy (p, r, p[1]); 2210 r += p[1]; 2211 rlen += p[1]; 2212 } 2213 if (rlen) { 2214 if (debug) 2215 addlog(" send conf-rej\n"); 2216 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2217 goto end; 2218 } else if (debug) 2219 addlog("\n"); 2220 2221 /* 2222 * pass 2: check for option values that are unacceptable and 2223 * thus require to be nak'ed. 2224 */ 2225 if (debug) 2226 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2227 ifp->if_xname); 2228 2229 p = (void *)(h + 1); 2230 len = origlen; 2231 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2232 if (debug) 2233 addlog(" %s", sppp_lcp_opt_name(*p)); 2234 switch (*p) { 2235 case LCP_OPT_MAGIC: 2236 /* Magic number -- extract. */ 2237 nmagic = (uint32_t)p[2] << 24 | 2238 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2239 if (nmagic != sp->lcp.magic) { 2240 if (debug) 2241 addlog(" 0x%x", nmagic); 2242 continue; 2243 } 2244 /* 2245 * Local and remote magics equal -- loopback? 2246 */ 2247 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2248 printf ("%s: loopback\n", 2249 ifp->if_xname); 2250 sp->pp_loopcnt = 0; 2251 if (ifp->if_flags & IFF_UP) { 2252 if_down(ifp); 2253 IF_PURGE(&sp->pp_cpq); 2254 /* XXX ? */ 2255 lcp.Down(sp); 2256 lcp.Up(sp); 2257 } 2258 } else if (debug) 2259 addlog(" [glitch]"); 2260 ++sp->pp_loopcnt; 2261 /* 2262 * We negate our magic here, and NAK it. If 2263 * we see it later in an NAK packet, we 2264 * suggest a new one. 2265 */ 2266 nmagic = ~sp->lcp.magic; 2267 /* Gonna NAK it. */ 2268 p[2] = nmagic >> 24; 2269 p[3] = nmagic >> 16; 2270 p[4] = nmagic >> 8; 2271 p[5] = nmagic; 2272 break; 2273 2274 case LCP_OPT_ASYNC_MAP: 2275 /* 2276 * Async control character map -- just ignore it. 2277 * 2278 * Quote from RFC 1662, chapter 6: 2279 * To enable this functionality, synchronous PPP 2280 * implementations MUST always respond to the 2281 * Async-Control-Character-Map Configuration 2282 * Option with the LCP Configure-Ack. However, 2283 * acceptance of the Configuration Option does 2284 * not imply that the synchronous implementation 2285 * will do any ACCM mapping. Instead, all such 2286 * octet mapping will be performed by the 2287 * asynchronous-to-synchronous converter. 2288 */ 2289 continue; 2290 2291 case LCP_OPT_MRU: 2292 /* 2293 * Maximum receive unit. Always agreeable, 2294 * but ignored by now. 2295 */ 2296 sp->lcp.their_mru = p[2] * 256 + p[3]; 2297 if (debug) 2298 addlog(" %ld", sp->lcp.their_mru); 2299 continue; 2300 2301 case LCP_OPT_AUTH_PROTO: 2302 authproto = (p[2] << 8) + p[3]; 2303 if (sp->myauth.proto != authproto) { 2304 /* not agreed, nak */ 2305 if (debug) 2306 addlog(" [mine %s != his %s]", 2307 sppp_proto_name(sp->myauth.proto), 2308 sppp_proto_name(authproto)); 2309 p[2] = sp->myauth.proto >> 8; 2310 p[3] = sp->myauth.proto; 2311 break; 2312 } 2313 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2314 if (debug) 2315 addlog(" [chap not MD5]"); 2316 p[4] = CHAP_MD5; 2317 break; 2318 } 2319 continue; 2320 } 2321 /* Add the option to nak'ed list. */ 2322 bcopy (p, r, p[1]); 2323 r += p[1]; 2324 rlen += p[1]; 2325 } 2326 if (rlen) { 2327 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2328 if (debug) 2329 addlog(" max_failure (%d) exceeded, " 2330 "send conf-rej\n", 2331 sp->lcp.max_failure); 2332 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2333 } else { 2334 if (debug) 2335 addlog(" send conf-nak\n"); 2336 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2337 } 2338 goto end; 2339 } else { 2340 if (debug) 2341 addlog(" send conf-ack\n"); 2342 sp->fail_counter[IDX_LCP] = 0; 2343 sp->pp_loopcnt = 0; 2344 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2345 } 2346 2347 end: 2348 free(buf, M_TEMP); 2349 return (rlen == 0); 2350 2351 drop: 2352 free(buf, M_TEMP); 2353 return -1; 2354 } 2355 2356 /* 2357 * Analyze the LCP Configure-Reject option list, and adjust our 2358 * negotiation. 2359 */ 2360 static void 2361 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2362 { 2363 STDDCL; 2364 u_char *buf, *p; 2365 2366 len -= 4; 2367 buf = malloc (len, M_TEMP, M_NOWAIT); 2368 if (!buf) 2369 return; 2370 2371 if (debug) 2372 log(LOG_DEBUG, "%s: lcp rej opts:", 2373 ifp->if_xname); 2374 2375 p = (void *)(h + 1); 2376 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2377 /* Sanity check option length */ 2378 if (p[1] > len) { 2379 /* 2380 * Malicious option - drop immediately. 2381 * XXX Maybe we should just RXJ it? 2382 */ 2383 addlog("%s: received malicious LCP option, " 2384 "dropping.\n", ifp->if_xname); 2385 goto drop; 2386 } 2387 if (debug) 2388 addlog(" %s", sppp_lcp_opt_name(*p)); 2389 switch (*p) { 2390 case LCP_OPT_MAGIC: 2391 /* Magic number -- can't use it, use 0 */ 2392 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2393 sp->lcp.magic = 0; 2394 break; 2395 case LCP_OPT_MRU: 2396 /* 2397 * We try to negotiate a lower MRU if the underlying 2398 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2399 * peer rejects this lower rate, fallback to the 2400 * default. 2401 */ 2402 if (debug) { 2403 addlog("%s: warning: peer rejected our MRU of " 2404 "%ld bytes. Defaulting to %d bytes\n", 2405 ifp->if_xname, sp->lcp.mru, PP_MTU); 2406 } 2407 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2408 sp->lcp.mru = PP_MTU; 2409 break; 2410 case LCP_OPT_AUTH_PROTO: 2411 /* 2412 * Peer doesn't want to authenticate himself, 2413 * deny unless this is a dialout call, and 2414 * SPPP_AUTHFLAG_NOCALLOUT is set. 2415 */ 2416 if ((sp->pp_flags & PP_CALLIN) == 0 && 2417 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2418 if (debug) 2419 addlog(" [don't insist on auth " 2420 "for callout]"); 2421 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2422 break; 2423 } 2424 if (debug) 2425 addlog("[access denied]\n"); 2426 lcp.Close(sp); 2427 break; 2428 } 2429 } 2430 if (debug) 2431 addlog("\n"); 2432 drop: 2433 free(buf, M_TEMP); 2434 return; 2435 } 2436 2437 /* 2438 * Analyze the LCP Configure-NAK option list, and adjust our 2439 * negotiation. 2440 */ 2441 static void 2442 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2443 { 2444 STDDCL; 2445 u_char *buf, *p; 2446 uint32_t magic; 2447 2448 len -= 4; 2449 buf = malloc (len, M_TEMP, M_NOWAIT); 2450 if (!buf) 2451 return; 2452 2453 if (debug) 2454 log(LOG_DEBUG, "%s: lcp nak opts:", 2455 ifp->if_xname); 2456 2457 p = (void *)(h + 1); 2458 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2459 /* Sanity check option length */ 2460 if (p[1] > len) { 2461 /* 2462 * Malicious option - drop immediately. 2463 * XXX Maybe we should just RXJ it? 2464 */ 2465 addlog("%s: received malicious LCP option, " 2466 "dropping.\n", ifp->if_xname); 2467 goto drop; 2468 } 2469 if (debug) 2470 addlog(" %s", sppp_lcp_opt_name(*p)); 2471 switch (*p) { 2472 case LCP_OPT_MAGIC: 2473 /* Magic number -- renegotiate */ 2474 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2475 len >= 6 && p[1] == 6) { 2476 magic = (uint32_t)p[2] << 24 | 2477 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2478 /* 2479 * If the remote magic is our negated one, 2480 * this looks like a loopback problem. 2481 * Suggest a new magic to make sure. 2482 */ 2483 if (magic == ~sp->lcp.magic) { 2484 if (debug) 2485 addlog(" magic glitch"); 2486 sp->lcp.magic = cprng_fast32(); 2487 } else { 2488 sp->lcp.magic = magic; 2489 if (debug) 2490 addlog(" %d", magic); 2491 } 2492 } 2493 break; 2494 case LCP_OPT_MRU: 2495 /* 2496 * Peer wants to advise us to negotiate an MRU. 2497 * Agree on it if it's reasonable, or use 2498 * default otherwise. 2499 */ 2500 if (len >= 4 && p[1] == 4) { 2501 u_int mru = p[2] * 256 + p[3]; 2502 if (debug) 2503 addlog(" %d", mru); 2504 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 2505 mru = sp->pp_if.if_mtu; 2506 sp->lcp.mru = mru; 2507 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2508 } 2509 break; 2510 case LCP_OPT_AUTH_PROTO: 2511 /* 2512 * Peer doesn't like our authentication method, 2513 * deny. 2514 */ 2515 if (debug) 2516 addlog("[access denied]\n"); 2517 lcp.Close(sp); 2518 break; 2519 } 2520 } 2521 if (debug) 2522 addlog("\n"); 2523 drop: 2524 free(buf, M_TEMP); 2525 return; 2526 } 2527 2528 static void 2529 sppp_lcp_tlu(struct sppp *sp) 2530 { 2531 struct ifnet *ifp = &sp->pp_if; 2532 int i; 2533 uint32_t mask; 2534 2535 /* XXX ? */ 2536 if (! (ifp->if_flags & IFF_UP) && 2537 (ifp->if_flags & IFF_RUNNING)) { 2538 /* Coming out of loopback mode. */ 2539 if_up(ifp); 2540 } 2541 2542 for (i = 0; i < IDX_COUNT; i++) 2543 if ((cps[i])->flags & CP_QUAL) 2544 (cps[i])->Open(sp); 2545 2546 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2547 (sp->pp_flags & PP_NEEDAUTH) != 0) 2548 sppp_change_phase(sp, SPPP_PHASE_AUTHENTICATE); 2549 else 2550 sppp_change_phase(sp, SPPP_PHASE_NETWORK); 2551 2552 /* 2553 * Open all authentication protocols. This is even required 2554 * if we already proceeded to network phase, since it might be 2555 * that remote wants us to authenticate, so we might have to 2556 * send a PAP request. Undesired authentication protocols 2557 * don't do anything when they get an Open event. 2558 */ 2559 for (i = 0; i < IDX_COUNT; i++) 2560 if ((cps[i])->flags & CP_AUTH) 2561 (cps[i])->Open(sp); 2562 2563 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2564 /* Notify all NCPs. */ 2565 for (i = 0; i < IDX_COUNT; i++) 2566 if ((cps[i])->flags & CP_NCP) 2567 (cps[i])->Open(sp); 2568 } 2569 2570 /* Send Up events to all started protos. */ 2571 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2572 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2573 (cps[i])->Up(sp); 2574 2575 /* notify low-level driver of state change */ 2576 if (sp->pp_chg) 2577 sp->pp_chg(sp, (int)sp->pp_phase); 2578 2579 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2580 /* if no NCP is starting, close down */ 2581 sppp_lcp_check_and_close(sp); 2582 } 2583 2584 static void 2585 sppp_lcp_tld(struct sppp *sp) 2586 { 2587 int i; 2588 uint32_t mask; 2589 2590 sppp_change_phase(sp, SPPP_PHASE_TERMINATE); 2591 2592 /* 2593 * Take upper layers down. We send the Down event first and 2594 * the Close second to prevent the upper layers from sending 2595 * ``a flurry of terminate-request packets'', as the RFC 2596 * describes it. 2597 */ 2598 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2599 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2600 (cps[i])->Down(sp); 2601 (cps[i])->Close(sp); 2602 } 2603 } 2604 2605 static void 2606 sppp_lcp_tls(struct sppp *sp) 2607 { 2608 2609 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2610 printf("%s: authentication failed %d times, not retrying again\n", 2611 sp->pp_if.if_xname, sp->pp_auth_failures); 2612 if_down(&sp->pp_if); 2613 return; 2614 } 2615 2616 sppp_change_phase(sp, SPPP_PHASE_ESTABLISH); 2617 2618 /* Notify lower layer if desired. */ 2619 if (sp->pp_tls) 2620 (sp->pp_tls)(sp); 2621 } 2622 2623 static void 2624 sppp_lcp_tlf(struct sppp *sp) 2625 { 2626 2627 sppp_change_phase(sp, SPPP_PHASE_DEAD); 2628 2629 /* Notify lower layer if desired. */ 2630 if (sp->pp_tlf) 2631 (sp->pp_tlf)(sp); 2632 } 2633 2634 static void 2635 sppp_lcp_scr(struct sppp *sp) 2636 { 2637 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2638 int i = 0; 2639 u_short authproto; 2640 2641 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2642 if (! sp->lcp.magic) 2643 sp->lcp.magic = cprng_fast32(); 2644 opt[i++] = LCP_OPT_MAGIC; 2645 opt[i++] = 6; 2646 opt[i++] = sp->lcp.magic >> 24; 2647 opt[i++] = sp->lcp.magic >> 16; 2648 opt[i++] = sp->lcp.magic >> 8; 2649 opt[i++] = sp->lcp.magic; 2650 } 2651 2652 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2653 opt[i++] = LCP_OPT_MRU; 2654 opt[i++] = 4; 2655 opt[i++] = sp->lcp.mru >> 8; 2656 opt[i++] = sp->lcp.mru; 2657 } 2658 2659 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2660 authproto = sp->hisauth.proto; 2661 opt[i++] = LCP_OPT_AUTH_PROTO; 2662 opt[i++] = authproto == PPP_CHAP? 5: 4; 2663 opt[i++] = authproto >> 8; 2664 opt[i++] = authproto; 2665 if (authproto == PPP_CHAP) 2666 opt[i++] = CHAP_MD5; 2667 } 2668 2669 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2670 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2671 } 2672 2673 /* 2674 * Check the open NCPs, return true if at least one NCP is open. 2675 */ 2676 static int 2677 sppp_ncp_check(struct sppp *sp) 2678 { 2679 int i, mask; 2680 2681 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2682 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2683 return 1; 2684 return 0; 2685 } 2686 2687 /* 2688 * Re-check the open NCPs and see if we should terminate the link. 2689 * Called by the NCPs during their tlf action handling. 2690 */ 2691 static void 2692 sppp_lcp_check_and_close(struct sppp *sp) 2693 { 2694 2695 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2696 /* don't bother, we are already going down */ 2697 return; 2698 2699 if (sppp_ncp_check(sp)) 2700 return; 2701 2702 lcp.Close(sp); 2703 } 2704 2705 2706 /* 2707 *--------------------------------------------------------------------------* 2708 * * 2709 * The IPCP implementation. * 2710 * * 2711 *--------------------------------------------------------------------------* 2712 */ 2713 2714 static void 2715 sppp_ipcp_init(struct sppp *sp) 2716 { 2717 sp->ipcp.opts = 0; 2718 sp->ipcp.flags = 0; 2719 sp->state[IDX_IPCP] = STATE_INITIAL; 2720 sp->fail_counter[IDX_IPCP] = 0; 2721 sp->pp_seq[IDX_IPCP] = 0; 2722 sp->pp_rseq[IDX_IPCP] = 0; 2723 callout_init(&sp->ch[IDX_IPCP], 0); 2724 } 2725 2726 static void 2727 sppp_ipcp_up(struct sppp *sp) 2728 { 2729 sppp_up_event(&ipcp, sp); 2730 } 2731 2732 static void 2733 sppp_ipcp_down(struct sppp *sp) 2734 { 2735 sppp_down_event(&ipcp, sp); 2736 } 2737 2738 static void 2739 sppp_ipcp_open(struct sppp *sp) 2740 { 2741 STDDCL; 2742 uint32_t myaddr, hisaddr; 2743 2744 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2745 sp->ipcp.req_myaddr = 0; 2746 sp->ipcp.req_hisaddr = 0; 2747 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2748 2749 #ifdef INET 2750 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2751 #else 2752 myaddr = hisaddr = 0; 2753 #endif 2754 /* 2755 * If we don't have his address, this probably means our 2756 * interface doesn't want to talk IP at all. (This could 2757 * be the case if somebody wants to speak only IPX, for 2758 * example.) Don't open IPCP in this case. 2759 */ 2760 if (hisaddr == 0) { 2761 /* XXX this message should go away */ 2762 if (debug) 2763 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2764 ifp->if_xname); 2765 return; 2766 } 2767 2768 if (myaddr == 0) { 2769 /* 2770 * I don't have an assigned address, so i need to 2771 * negotiate my address. 2772 */ 2773 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2774 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2775 } 2776 if (hisaddr == 1) { 2777 /* 2778 * XXX - remove this hack! 2779 * remote has no valid address, we need to get one assigned. 2780 */ 2781 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2782 } 2783 sppp_open_event(&ipcp, sp); 2784 } 2785 2786 static void 2787 sppp_ipcp_close(struct sppp *sp) 2788 { 2789 STDDCL; 2790 2791 sppp_close_event(&ipcp, sp); 2792 #ifdef INET 2793 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2794 /* 2795 * Some address was dynamic, clear it again. 2796 */ 2797 sppp_clear_ip_addrs(sp); 2798 #endif 2799 2800 if (sp->pp_saved_mtu > 0) { 2801 ifp->if_mtu = sp->pp_saved_mtu; 2802 sp->pp_saved_mtu = 0; 2803 if (debug) 2804 log(LOG_DEBUG, 2805 "%s: resetting MTU to %" PRIu64 " bytes\n", 2806 ifp->if_xname, ifp->if_mtu); 2807 } 2808 } 2809 2810 static void 2811 sppp_ipcp_TO(void *cookie) 2812 { 2813 sppp_to_event(&ipcp, (struct sppp *)cookie); 2814 } 2815 2816 /* 2817 * Analyze a configure request. Return true if it was agreeable, and 2818 * caused action sca, false if it has been rejected or nak'ed, and 2819 * caused action scn. (The return value is used to make the state 2820 * transition decision in the state automaton.) 2821 */ 2822 static int 2823 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2824 { 2825 u_char *buf, *r, *p; 2826 struct ifnet *ifp = &sp->pp_if; 2827 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2828 uint32_t hisaddr, desiredaddr; 2829 2830 len -= 4; 2831 origlen = len; 2832 /* 2833 * Make sure to allocate a buf that can at least hold a 2834 * conf-nak with an `address' option. We might need it below. 2835 */ 2836 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2837 if (! buf) 2838 return (0); 2839 2840 /* pass 1: see if we can recognize them */ 2841 if (debug) 2842 log(LOG_DEBUG, "%s: ipcp parse opts:", 2843 ifp->if_xname); 2844 p = (void *)(h + 1); 2845 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2846 /* Sanity check option length */ 2847 if (p[1] > len) { 2848 /* XXX should we just RXJ? */ 2849 addlog("%s: malicious IPCP option received, dropping\n", 2850 ifp->if_xname); 2851 goto drop; 2852 } 2853 if (debug) 2854 addlog(" %s", sppp_ipcp_opt_name(*p)); 2855 switch (*p) { 2856 #ifdef notyet 2857 case IPCP_OPT_COMPRESSION: 2858 if (len >= 6 && p[1] >= 6) { 2859 /* correctly formed compress option */ 2860 continue; 2861 } 2862 if (debug) 2863 addlog(" [invalid]"); 2864 break; 2865 #endif 2866 case IPCP_OPT_ADDRESS: 2867 if (len >= 6 && p[1] == 6) { 2868 /* correctly formed address option */ 2869 continue; 2870 } 2871 if (debug) 2872 addlog(" [invalid]"); 2873 break; 2874 default: 2875 /* Others not supported. */ 2876 if (debug) 2877 addlog(" [rej]"); 2878 break; 2879 } 2880 /* Add the option to rejected list. */ 2881 bcopy (p, r, p[1]); 2882 r += p[1]; 2883 rlen += p[1]; 2884 } 2885 if (rlen) { 2886 if (debug) 2887 addlog(" send conf-rej\n"); 2888 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2889 goto end; 2890 } else if (debug) 2891 addlog("\n"); 2892 2893 /* pass 2: parse option values */ 2894 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2895 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2896 else 2897 #ifdef INET 2898 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2899 #else 2900 hisaddr = 0; 2901 #endif 2902 if (debug) 2903 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2904 ifp->if_xname); 2905 p = (void *)(h + 1); 2906 len = origlen; 2907 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2908 if (debug) 2909 addlog(" %s", sppp_ipcp_opt_name(*p)); 2910 switch (*p) { 2911 #ifdef notyet 2912 case IPCP_OPT_COMPRESSION: 2913 continue; 2914 #endif 2915 case IPCP_OPT_ADDRESS: 2916 desiredaddr = p[2] << 24 | p[3] << 16 | 2917 p[4] << 8 | p[5]; 2918 if (desiredaddr == hisaddr || 2919 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2920 /* 2921 * Peer's address is same as our value, 2922 * this is agreeable. Gonna conf-ack 2923 * it. 2924 */ 2925 if (debug) 2926 addlog(" %s [ack]", 2927 sppp_dotted_quad(hisaddr)); 2928 /* record that we've seen it already */ 2929 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2930 sp->ipcp.req_hisaddr = desiredaddr; 2931 hisaddr = desiredaddr; 2932 continue; 2933 } 2934 /* 2935 * The address wasn't agreeable. This is either 2936 * he sent us 0.0.0.0, asking to assign him an 2937 * address, or he send us another address not 2938 * matching our value. Either case, we gonna 2939 * conf-nak it with our value. 2940 */ 2941 if (debug) { 2942 if (desiredaddr == 0) 2943 addlog(" [addr requested]"); 2944 else 2945 addlog(" %s [not agreed]", 2946 sppp_dotted_quad(desiredaddr)); 2947 } 2948 2949 p[2] = hisaddr >> 24; 2950 p[3] = hisaddr >> 16; 2951 p[4] = hisaddr >> 8; 2952 p[5] = hisaddr; 2953 break; 2954 } 2955 /* Add the option to nak'ed list. */ 2956 bcopy (p, r, p[1]); 2957 r += p[1]; 2958 rlen += p[1]; 2959 } 2960 2961 /* 2962 * If we are about to conf-ack the request, but haven't seen 2963 * his address so far, gonna conf-nak it instead, with the 2964 * `address' option present and our idea of his address being 2965 * filled in there, to request negotiation of both addresses. 2966 * 2967 * XXX This can result in an endless req - nak loop if peer 2968 * doesn't want to send us his address. Q: What should we do 2969 * about it? XXX A: implement the max-failure counter. 2970 */ 2971 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2972 buf[0] = IPCP_OPT_ADDRESS; 2973 buf[1] = 6; 2974 buf[2] = hisaddr >> 24; 2975 buf[3] = hisaddr >> 16; 2976 buf[4] = hisaddr >> 8; 2977 buf[5] = hisaddr; 2978 rlen = 6; 2979 if (debug) 2980 addlog(" still need hisaddr"); 2981 } 2982 2983 if (rlen) { 2984 if (debug) 2985 addlog(" send conf-nak\n"); 2986 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2987 } else { 2988 if (debug) 2989 addlog(" send conf-ack\n"); 2990 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 2991 } 2992 2993 end: 2994 free(buf, M_TEMP); 2995 return (rlen == 0); 2996 2997 drop: 2998 free(buf, M_TEMP); 2999 return -1; 3000 } 3001 3002 /* 3003 * Analyze the IPCP Configure-Reject option list, and adjust our 3004 * negotiation. 3005 */ 3006 static void 3007 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3008 { 3009 u_char *buf, *p; 3010 struct ifnet *ifp = &sp->pp_if; 3011 int debug = ifp->if_flags & IFF_DEBUG; 3012 3013 len -= 4; 3014 buf = malloc (len, M_TEMP, M_NOWAIT); 3015 if (!buf) 3016 return; 3017 3018 if (debug) 3019 log(LOG_DEBUG, "%s: ipcp rej opts:", 3020 ifp->if_xname); 3021 3022 p = (void *)(h + 1); 3023 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3024 /* Sanity check option length */ 3025 if (p[1] > len) { 3026 /* XXX should we just RXJ? */ 3027 addlog("%s: malicious IPCP option received, dropping\n", 3028 ifp->if_xname); 3029 goto drop; 3030 } 3031 if (debug) 3032 addlog(" %s", sppp_ipcp_opt_name(*p)); 3033 switch (*p) { 3034 case IPCP_OPT_ADDRESS: 3035 /* 3036 * Peer doesn't grok address option. This is 3037 * bad. XXX Should we better give up here? 3038 */ 3039 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3040 break; 3041 #ifdef notyet 3042 case IPCP_OPT_COMPRESS: 3043 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3044 break; 3045 #endif 3046 } 3047 } 3048 if (debug) 3049 addlog("\n"); 3050 drop: 3051 free(buf, M_TEMP); 3052 return; 3053 } 3054 3055 /* 3056 * Analyze the IPCP Configure-NAK option list, and adjust our 3057 * negotiation. 3058 */ 3059 static void 3060 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3061 { 3062 u_char *p; 3063 struct ifnet *ifp = &sp->pp_if; 3064 int debug = ifp->if_flags & IFF_DEBUG; 3065 uint32_t wantaddr; 3066 3067 len -= 4; 3068 3069 if (debug) 3070 log(LOG_DEBUG, "%s: ipcp nak opts:", 3071 ifp->if_xname); 3072 3073 p = (void *)(h + 1); 3074 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3075 /* Sanity check option length */ 3076 if (p[1] > len) { 3077 /* XXX should we just RXJ? */ 3078 addlog("%s: malicious IPCP option received, dropping\n", 3079 ifp->if_xname); 3080 return; 3081 } 3082 if (debug) 3083 addlog(" %s", sppp_ipcp_opt_name(*p)); 3084 switch (*p) { 3085 case IPCP_OPT_ADDRESS: 3086 /* 3087 * Peer doesn't like our local IP address. See 3088 * if we can do something for him. We'll drop 3089 * him our address then. 3090 */ 3091 if (len >= 6 && p[1] == 6) { 3092 wantaddr = p[2] << 24 | p[3] << 16 | 3093 p[4] << 8 | p[5]; 3094 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3095 if (debug) 3096 addlog(" [wantaddr %s]", 3097 sppp_dotted_quad(wantaddr)); 3098 /* 3099 * When doing dynamic address assignment, 3100 * we accept his offer. Otherwise, we 3101 * ignore it and thus continue to negotiate 3102 * our already existing value. 3103 */ 3104 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3105 if (debug) 3106 addlog(" [agree]"); 3107 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3108 sp->ipcp.req_myaddr = wantaddr; 3109 } 3110 } 3111 break; 3112 3113 case IPCP_OPT_PRIMDNS: 3114 if (len >= 6 && p[1] == 6) { 3115 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3116 p[4] << 8 | p[5]; 3117 } 3118 break; 3119 3120 case IPCP_OPT_SECDNS: 3121 if (len >= 6 && p[1] == 6) { 3122 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3123 p[4] << 8 | p[5]; 3124 } 3125 break; 3126 #ifdef notyet 3127 case IPCP_OPT_COMPRESS: 3128 /* 3129 * Peer wants different compression parameters. 3130 */ 3131 break; 3132 #endif 3133 } 3134 } 3135 if (debug) 3136 addlog("\n"); 3137 } 3138 3139 static void 3140 sppp_ipcp_tlu(struct sppp *sp) 3141 { 3142 #ifdef INET 3143 /* we are up. Set addresses and notify anyone interested */ 3144 STDDCL; 3145 uint32_t myaddr, hisaddr; 3146 3147 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3148 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3149 myaddr = sp->ipcp.req_myaddr; 3150 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3151 hisaddr = sp->ipcp.req_hisaddr; 3152 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3153 3154 if (ifp->if_mtu > sp->lcp.their_mru) { 3155 sp->pp_saved_mtu = ifp->if_mtu; 3156 ifp->if_mtu = sp->lcp.their_mru; 3157 if (debug) 3158 log(LOG_DEBUG, 3159 "%s: setting MTU to %" PRIu64 " bytes\n", 3160 ifp->if_xname, ifp->if_mtu); 3161 } 3162 3163 if (sp->pp_con) 3164 sp->pp_con(sp); 3165 #endif 3166 } 3167 3168 static void 3169 sppp_ipcp_tld(struct sppp *sp) 3170 { 3171 } 3172 3173 static void 3174 sppp_ipcp_tls(struct sppp *sp) 3175 { 3176 /* indicate to LCP that it must stay alive */ 3177 sp->lcp.protos |= (1 << IDX_IPCP); 3178 } 3179 3180 static void 3181 sppp_ipcp_tlf(struct sppp *sp) 3182 { 3183 /* we no longer need LCP */ 3184 sp->lcp.protos &= ~(1 << IDX_IPCP); 3185 } 3186 3187 static void 3188 sppp_ipcp_scr(struct sppp *sp) 3189 { 3190 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3191 #ifdef INET 3192 uint32_t ouraddr; 3193 #endif 3194 int i = 0; 3195 3196 #ifdef notyet 3197 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3198 opt[i++] = IPCP_OPT_COMPRESSION; 3199 opt[i++] = 6; 3200 opt[i++] = 0; /* VJ header compression */ 3201 opt[i++] = 0x2d; /* VJ header compression */ 3202 opt[i++] = max_slot_id; 3203 opt[i++] = comp_slot_id; 3204 } 3205 #endif 3206 3207 #ifdef INET 3208 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3209 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3210 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3211 else 3212 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3213 opt[i++] = IPCP_OPT_ADDRESS; 3214 opt[i++] = 6; 3215 opt[i++] = ouraddr >> 24; 3216 opt[i++] = ouraddr >> 16; 3217 opt[i++] = ouraddr >> 8; 3218 opt[i++] = ouraddr; 3219 } 3220 #endif 3221 3222 if (sp->query_dns & 1) { 3223 opt[i++] = IPCP_OPT_PRIMDNS; 3224 opt[i++] = 6; 3225 opt[i++] = sp->dns_addrs[0] >> 24; 3226 opt[i++] = sp->dns_addrs[0] >> 16; 3227 opt[i++] = sp->dns_addrs[0] >> 8; 3228 opt[i++] = sp->dns_addrs[0]; 3229 } 3230 if (sp->query_dns & 2) { 3231 opt[i++] = IPCP_OPT_SECDNS; 3232 opt[i++] = 6; 3233 opt[i++] = sp->dns_addrs[1] >> 24; 3234 opt[i++] = sp->dns_addrs[1] >> 16; 3235 opt[i++] = sp->dns_addrs[1] >> 8; 3236 opt[i++] = sp->dns_addrs[1]; 3237 } 3238 3239 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3240 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3241 } 3242 3243 3244 /* 3245 *--------------------------------------------------------------------------* 3246 * * 3247 * The IPv6CP implementation. * 3248 * * 3249 *--------------------------------------------------------------------------* 3250 */ 3251 3252 #ifdef INET6 3253 static void 3254 sppp_ipv6cp_init(struct sppp *sp) 3255 { 3256 sp->ipv6cp.opts = 0; 3257 sp->ipv6cp.flags = 0; 3258 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3259 sp->fail_counter[IDX_IPV6CP] = 0; 3260 sp->pp_seq[IDX_IPV6CP] = 0; 3261 sp->pp_rseq[IDX_IPV6CP] = 0; 3262 callout_init(&sp->ch[IDX_IPV6CP], 0); 3263 } 3264 3265 static void 3266 sppp_ipv6cp_up(struct sppp *sp) 3267 { 3268 sppp_up_event(&ipv6cp, sp); 3269 } 3270 3271 static void 3272 sppp_ipv6cp_down(struct sppp *sp) 3273 { 3274 sppp_down_event(&ipv6cp, sp); 3275 } 3276 3277 static void 3278 sppp_ipv6cp_open(struct sppp *sp) 3279 { 3280 STDDCL; 3281 struct in6_addr myaddr, hisaddr; 3282 3283 #ifdef IPV6CP_MYIFID_DYN 3284 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3285 #else 3286 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3287 #endif 3288 3289 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3290 /* 3291 * If we don't have our address, this probably means our 3292 * interface doesn't want to talk IPv6 at all. (This could 3293 * be the case if somebody wants to speak only IPX, for 3294 * example.) Don't open IPv6CP in this case. 3295 */ 3296 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3297 /* XXX this message should go away */ 3298 if (debug) 3299 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3300 ifp->if_xname); 3301 return; 3302 } 3303 3304 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3305 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3306 sppp_open_event(&ipv6cp, sp); 3307 } 3308 3309 static void 3310 sppp_ipv6cp_close(struct sppp *sp) 3311 { 3312 sppp_close_event(&ipv6cp, sp); 3313 } 3314 3315 static void 3316 sppp_ipv6cp_TO(void *cookie) 3317 { 3318 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3319 } 3320 3321 /* 3322 * Analyze a configure request. Return true if it was agreeable, and 3323 * caused action sca, false if it has been rejected or nak'ed, and 3324 * caused action scn. (The return value is used to make the state 3325 * transition decision in the state automaton.) 3326 */ 3327 static int 3328 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3329 { 3330 u_char *buf, *r, *p; 3331 struct ifnet *ifp = &sp->pp_if; 3332 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3333 struct in6_addr myaddr, desiredaddr, suggestaddr; 3334 int ifidcount; 3335 int type; 3336 int collision, nohisaddr; 3337 3338 len -= 4; 3339 origlen = len; 3340 /* 3341 * Make sure to allocate a buf that can at least hold a 3342 * conf-nak with an `address' option. We might need it below. 3343 */ 3344 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3345 if (! buf) 3346 return (0); 3347 3348 /* pass 1: see if we can recognize them */ 3349 if (debug) 3350 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3351 ifp->if_xname); 3352 p = (void *)(h + 1); 3353 ifidcount = 0; 3354 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3355 /* Sanity check option length */ 3356 if (p[1] > len) { 3357 /* XXX just RXJ? */ 3358 addlog("%s: received malicious IPCPv6 option, " 3359 "dropping\n", ifp->if_xname); 3360 goto drop; 3361 } 3362 if (debug) 3363 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3364 switch (*p) { 3365 case IPV6CP_OPT_IFID: 3366 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3367 /* correctly formed address option */ 3368 ifidcount++; 3369 continue; 3370 } 3371 if (debug) 3372 addlog(" [invalid]"); 3373 break; 3374 #ifdef notyet 3375 case IPV6CP_OPT_COMPRESSION: 3376 if (len >= 4 && p[1] >= 4) { 3377 /* correctly formed compress option */ 3378 continue; 3379 } 3380 if (debug) 3381 addlog(" [invalid]"); 3382 break; 3383 #endif 3384 default: 3385 /* Others not supported. */ 3386 if (debug) 3387 addlog(" [rej]"); 3388 break; 3389 } 3390 /* Add the option to rejected list. */ 3391 bcopy (p, r, p[1]); 3392 r += p[1]; 3393 rlen += p[1]; 3394 } 3395 if (rlen) { 3396 if (debug) 3397 addlog(" send conf-rej\n"); 3398 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3399 goto end; 3400 } else if (debug) 3401 addlog("\n"); 3402 3403 /* pass 2: parse option values */ 3404 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3405 if (debug) 3406 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3407 ifp->if_xname); 3408 p = (void *)(h + 1); 3409 len = origlen; 3410 type = CONF_ACK; 3411 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3412 if (debug) 3413 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3414 switch (*p) { 3415 #ifdef notyet 3416 case IPV6CP_OPT_COMPRESSION: 3417 continue; 3418 #endif 3419 case IPV6CP_OPT_IFID: 3420 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3421 memcpy(&desiredaddr.s6_addr[8], &p[2], 8); 3422 collision = (memcmp(&desiredaddr.s6_addr[8], 3423 &myaddr.s6_addr[8], 8) == 0); 3424 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3425 3426 desiredaddr.s6_addr16[0] = htons(0xfe80); 3427 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3428 3429 if (!collision && !nohisaddr) { 3430 /* no collision, hisaddr known - Conf-Ack */ 3431 type = CONF_ACK; 3432 3433 if (debug) { 3434 addlog(" %s [%s]", 3435 ip6_sprintf(&desiredaddr), 3436 sppp_cp_type_name(type)); 3437 } 3438 continue; 3439 } 3440 3441 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3442 if (collision && nohisaddr) { 3443 /* collision, hisaddr unknown - Conf-Rej */ 3444 type = CONF_REJ; 3445 memset(&p[2], 0, 8); 3446 } else { 3447 /* 3448 * - no collision, hisaddr unknown, or 3449 * - collision, hisaddr known 3450 * Conf-Nak, suggest hisaddr 3451 */ 3452 type = CONF_NAK; 3453 sppp_suggest_ip6_addr(sp, &suggestaddr); 3454 memcpy(&p[2], &suggestaddr.s6_addr[8], 8); 3455 } 3456 if (debug) 3457 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3458 sppp_cp_type_name(type)); 3459 break; 3460 } 3461 /* Add the option to nak'ed list. */ 3462 bcopy (p, r, p[1]); 3463 r += p[1]; 3464 rlen += p[1]; 3465 } 3466 3467 if (rlen == 0 && type == CONF_ACK) { 3468 if (debug) 3469 addlog(" send %s\n", sppp_cp_type_name(type)); 3470 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3471 } else { 3472 #ifdef notdef 3473 if (type == CONF_ACK) 3474 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3475 #endif 3476 3477 if (debug) { 3478 addlog(" send %s suggest %s\n", 3479 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3480 } 3481 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3482 } 3483 3484 end: 3485 free(buf, M_TEMP); 3486 return (rlen == 0); 3487 3488 drop: 3489 free(buf, M_TEMP); 3490 return -1; 3491 } 3492 3493 /* 3494 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3495 * negotiation. 3496 */ 3497 static void 3498 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3499 { 3500 u_char *buf, *p; 3501 struct ifnet *ifp = &sp->pp_if; 3502 int debug = ifp->if_flags & IFF_DEBUG; 3503 3504 len -= 4; 3505 buf = malloc (len, M_TEMP, M_NOWAIT); 3506 if (!buf) 3507 return; 3508 3509 if (debug) 3510 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3511 ifp->if_xname); 3512 3513 p = (void *)(h + 1); 3514 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3515 if (p[1] > len) { 3516 /* XXX just RXJ? */ 3517 addlog("%s: received malicious IPCPv6 option, " 3518 "dropping\n", ifp->if_xname); 3519 goto drop; 3520 } 3521 if (debug) 3522 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3523 switch (*p) { 3524 case IPV6CP_OPT_IFID: 3525 /* 3526 * Peer doesn't grok address option. This is 3527 * bad. XXX Should we better give up here? 3528 */ 3529 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3530 break; 3531 #ifdef notyet 3532 case IPV6CP_OPT_COMPRESS: 3533 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3534 break; 3535 #endif 3536 } 3537 } 3538 if (debug) 3539 addlog("\n"); 3540 drop: 3541 free(buf, M_TEMP); 3542 return; 3543 } 3544 3545 /* 3546 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3547 * negotiation. 3548 */ 3549 static void 3550 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3551 { 3552 u_char *buf, *p; 3553 struct ifnet *ifp = &sp->pp_if; 3554 int debug = ifp->if_flags & IFF_DEBUG; 3555 struct in6_addr suggestaddr; 3556 3557 len -= 4; 3558 buf = malloc (len, M_TEMP, M_NOWAIT); 3559 if (!buf) 3560 return; 3561 3562 if (debug) 3563 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3564 ifp->if_xname); 3565 3566 p = (void *)(h + 1); 3567 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3568 if (p[1] > len) { 3569 /* XXX just RXJ? */ 3570 addlog("%s: received malicious IPCPv6 option, " 3571 "dropping\n", ifp->if_xname); 3572 goto drop; 3573 } 3574 if (debug) 3575 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3576 switch (*p) { 3577 case IPV6CP_OPT_IFID: 3578 /* 3579 * Peer doesn't like our local ifid. See 3580 * if we can do something for him. We'll drop 3581 * him our address then. 3582 */ 3583 if (len < 10 || p[1] != 10) 3584 break; 3585 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3586 suggestaddr.s6_addr16[0] = htons(0xfe80); 3587 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 3588 memcpy(&suggestaddr.s6_addr[8], &p[2], 8); 3589 3590 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3591 if (debug) 3592 addlog(" [suggestaddr %s]", 3593 ip6_sprintf(&suggestaddr)); 3594 #ifdef IPV6CP_MYIFID_DYN 3595 /* 3596 * When doing dynamic address assignment, 3597 * we accept his offer. 3598 */ 3599 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3600 struct in6_addr lastsuggest; 3601 /* 3602 * If <suggested myaddr from peer> equals to 3603 * <hisaddr we have suggested last time>, 3604 * we have a collision. generate new random 3605 * ifid. 3606 */ 3607 sppp_suggest_ip6_addr(&lastsuggest); 3608 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3609 lastsuggest)) { 3610 if (debug) 3611 addlog(" [random]"); 3612 sppp_gen_ip6_addr(sp, &suggestaddr); 3613 } 3614 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3615 if (debug) 3616 addlog(" [agree]"); 3617 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3618 } 3619 #else 3620 /* 3621 * Since we do not do dynamic address assignment, 3622 * we ignore it and thus continue to negotiate 3623 * our already existing value. This can possibly 3624 * go into infinite request-reject loop. 3625 * 3626 * This is not likely because we normally use 3627 * ifid based on MAC-address. 3628 * If you have no ethernet card on the node, too bad. 3629 * XXX should we use fail_counter? 3630 */ 3631 #endif 3632 break; 3633 #ifdef notyet 3634 case IPV6CP_OPT_COMPRESS: 3635 /* 3636 * Peer wants different compression parameters. 3637 */ 3638 break; 3639 #endif 3640 } 3641 } 3642 if (debug) 3643 addlog("\n"); 3644 drop: 3645 free(buf, M_TEMP); 3646 return; 3647 } 3648 3649 static void 3650 sppp_ipv6cp_tlu(struct sppp *sp) 3651 { 3652 /* we are up - notify isdn daemon */ 3653 if (sp->pp_con) 3654 sp->pp_con(sp); 3655 } 3656 3657 static void 3658 sppp_ipv6cp_tld(struct sppp *sp) 3659 { 3660 } 3661 3662 static void 3663 sppp_ipv6cp_tls(struct sppp *sp) 3664 { 3665 /* indicate to LCP that it must stay alive */ 3666 sp->lcp.protos |= (1 << IDX_IPV6CP); 3667 } 3668 3669 static void 3670 sppp_ipv6cp_tlf(struct sppp *sp) 3671 { 3672 /* we no longer need LCP */ 3673 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3674 } 3675 3676 static void 3677 sppp_ipv6cp_scr(struct sppp *sp) 3678 { 3679 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3680 struct in6_addr ouraddr; 3681 int i = 0; 3682 3683 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3684 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3685 opt[i++] = IPV6CP_OPT_IFID; 3686 opt[i++] = 10; 3687 memcpy(&opt[i], &ouraddr.s6_addr[8], 8); 3688 i += 8; 3689 } 3690 3691 #ifdef notyet 3692 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3693 opt[i++] = IPV6CP_OPT_COMPRESSION; 3694 opt[i++] = 4; 3695 opt[i++] = 0; /* TBD */ 3696 opt[i++] = 0; /* TBD */ 3697 /* variable length data may follow */ 3698 } 3699 #endif 3700 3701 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3702 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3703 } 3704 #else /*INET6*/ 3705 static void 3706 sppp_ipv6cp_init(struct sppp *sp) 3707 { 3708 } 3709 3710 static void 3711 sppp_ipv6cp_up(struct sppp *sp) 3712 { 3713 } 3714 3715 static void 3716 sppp_ipv6cp_down(struct sppp *sp) 3717 { 3718 } 3719 3720 static void 3721 sppp_ipv6cp_open(struct sppp *sp) 3722 { 3723 } 3724 3725 static void 3726 sppp_ipv6cp_close(struct sppp *sp) 3727 { 3728 } 3729 3730 static void 3731 sppp_ipv6cp_TO(void *sp) 3732 { 3733 } 3734 3735 static int 3736 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 3737 int len) 3738 { 3739 return 0; 3740 } 3741 3742 static void 3743 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 3744 int len) 3745 { 3746 } 3747 3748 static void 3749 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 3750 int len) 3751 { 3752 } 3753 3754 static void 3755 sppp_ipv6cp_tlu(struct sppp *sp) 3756 { 3757 } 3758 3759 static void 3760 sppp_ipv6cp_tld(struct sppp *sp) 3761 { 3762 } 3763 3764 static void 3765 sppp_ipv6cp_tls(struct sppp *sp) 3766 { 3767 } 3768 3769 static void 3770 sppp_ipv6cp_tlf(struct sppp *sp) 3771 { 3772 } 3773 3774 static void 3775 sppp_ipv6cp_scr(struct sppp *sp) 3776 { 3777 } 3778 #endif /*INET6*/ 3779 3780 3781 /* 3782 *--------------------------------------------------------------------------* 3783 * * 3784 * The CHAP implementation. * 3785 * * 3786 *--------------------------------------------------------------------------* 3787 */ 3788 3789 /* 3790 * The authentication protocols don't employ a full-fledged state machine as 3791 * the control protocols do, since they do have Open and Close events, but 3792 * not Up and Down, nor are they explicitly terminated. Also, use of the 3793 * authentication protocols may be different in both directions (this makes 3794 * sense, think of a machine that never accepts incoming calls but only 3795 * calls out, it doesn't require the called party to authenticate itself). 3796 * 3797 * Our state machine for the local authentication protocol (we are requesting 3798 * the peer to authenticate) looks like: 3799 * 3800 * RCA- 3801 * +--------------------------------------------+ 3802 * V scn,tld| 3803 * +--------+ Close +---------+ RCA+ 3804 * | |<----------------------------------| |------+ 3805 * +--->| Closed | TO* | Opened | sca | 3806 * | | |-----+ +-------| |<-----+ 3807 * | +--------+ irc | | +---------+ 3808 * | ^ | | ^ 3809 * | | | | | 3810 * | | | | | 3811 * | TO-| | | | 3812 * | |tld TO+ V | | 3813 * | | +------->+ | | 3814 * | | | | | | 3815 * | +--------+ V | | 3816 * | | |<----+<--------------------+ | 3817 * | | Req- | scr | 3818 * | | Sent | | 3819 * | | | | 3820 * | +--------+ | 3821 * | RCA- | | RCA+ | 3822 * +------+ +------------------------------------------+ 3823 * scn,tld sca,irc,ict,tlu 3824 * 3825 * 3826 * with: 3827 * 3828 * Open: LCP reached authentication phase 3829 * Close: LCP reached terminate phase 3830 * 3831 * RCA+: received reply (pap-req, chap-response), acceptable 3832 * RCN: received reply (pap-req, chap-response), not acceptable 3833 * TO+: timeout with restart counter >= 0 3834 * TO-: timeout with restart counter < 0 3835 * TO*: reschedule timeout for CHAP 3836 * 3837 * scr: send request packet (none for PAP, chap-challenge) 3838 * sca: send ack packet (pap-ack, chap-success) 3839 * scn: send nak packet (pap-nak, chap-failure) 3840 * ict: initialize re-challenge timer (CHAP only) 3841 * 3842 * tlu: this-layer-up, LCP reaches network phase 3843 * tld: this-layer-down, LCP enters terminate phase 3844 * 3845 * Note that in CHAP mode, after sending a new challenge, while the state 3846 * automaton falls back into Req-Sent state, it doesn't signal a tld 3847 * event to LCP, so LCP remains in network phase. Only after not getting 3848 * any response (or after getting an unacceptable response), CHAP closes, 3849 * causing LCP to enter terminate phase. 3850 * 3851 * With PAP, there is no initial request that can be sent. The peer is 3852 * expected to send one based on the successful negotiation of PAP as 3853 * the authentication protocol during the LCP option negotiation. 3854 * 3855 * Incoming authentication protocol requests (remote requests 3856 * authentication, we are peer) don't employ a state machine at all, 3857 * they are simply answered. Some peers [Ascend P50 firmware rev 3858 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3859 * still in authentication phase (thereby violating the standard that 3860 * demands that these NCP packets are to be discarded), so we keep 3861 * track of the peer demanding us to authenticate, and only proceed to 3862 * phase network once we've seen a positive acknowledge for the 3863 * authentication. 3864 */ 3865 3866 /* 3867 * Handle incoming CHAP packets. 3868 */ 3869 void 3870 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3871 { 3872 STDDCL; 3873 struct lcp_header *h; 3874 int len, x; 3875 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3876 int value_len, name_len; 3877 MD5_CTX ctx; 3878 3879 len = m->m_pkthdr.len; 3880 if (len < 4) { 3881 if (debug) 3882 log(LOG_DEBUG, 3883 "%s: chap invalid packet length: %d bytes\n", 3884 ifp->if_xname, len); 3885 return; 3886 } 3887 h = mtod(m, struct lcp_header *); 3888 if (len > ntohs(h->len)) 3889 len = ntohs(h->len); 3890 3891 switch (h->type) { 3892 /* challenge, failure and success are his authproto */ 3893 case CHAP_CHALLENGE: 3894 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3895 /* can't do anything useful */ 3896 sp->pp_auth_failures++; 3897 printf("%s: chap input without my name and my secret being set\n", 3898 ifp->if_xname); 3899 break; 3900 } 3901 value = 1 + (u_char *)(h + 1); 3902 value_len = value[-1]; 3903 name = value + value_len; 3904 name_len = len - value_len - 5; 3905 if (name_len < 0) { 3906 if (debug) { 3907 log(LOG_DEBUG, 3908 "%s: chap corrupted challenge " 3909 "<%s id=0x%x len=%d", 3910 ifp->if_xname, 3911 sppp_auth_type_name(PPP_CHAP, h->type), 3912 h->ident, ntohs(h->len)); 3913 if (len > 4) 3914 sppp_print_bytes((u_char *)(h + 1), 3915 len - 4); 3916 addlog(">\n"); 3917 } 3918 break; 3919 } 3920 3921 if (debug) { 3922 log(LOG_DEBUG, 3923 "%s: chap input <%s id=0x%x len=%d name=", 3924 ifp->if_xname, 3925 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3926 ntohs(h->len)); 3927 sppp_print_string((char *) name, name_len); 3928 addlog(" value-size=%d value=", value_len); 3929 sppp_print_bytes(value, value_len); 3930 addlog(">\n"); 3931 } 3932 3933 /* Compute reply value. */ 3934 MD5Init(&ctx); 3935 MD5Update(&ctx, &h->ident, 1); 3936 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3937 MD5Update(&ctx, value, value_len); 3938 MD5Final(digest, &ctx); 3939 dsize = sizeof digest; 3940 3941 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3942 sizeof dsize, (const char *)&dsize, 3943 sizeof digest, digest, 3944 sp->myauth.name_len, 3945 sp->myauth.name, 3946 0); 3947 break; 3948 3949 case CHAP_SUCCESS: 3950 if (debug) { 3951 log(LOG_DEBUG, "%s: chap success", 3952 ifp->if_xname); 3953 if (len > 4) { 3954 addlog(": "); 3955 sppp_print_string((char *)(h + 1), len - 4); 3956 } 3957 addlog("\n"); 3958 } 3959 x = splnet(); 3960 sp->pp_auth_failures = 0; 3961 sp->pp_flags &= ~PP_NEEDAUTH; 3962 if (sp->myauth.proto == PPP_CHAP && 3963 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3964 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3965 /* 3966 * We are authenticator for CHAP but didn't 3967 * complete yet. Leave it to tlu to proceed 3968 * to network phase. 3969 */ 3970 splx(x); 3971 break; 3972 } 3973 splx(x); 3974 sppp_phase_network(sp); 3975 break; 3976 3977 case CHAP_FAILURE: 3978 x = splnet(); 3979 sp->pp_auth_failures++; 3980 splx(x); 3981 if (debug) { 3982 log(LOG_INFO, "%s: chap failure", 3983 ifp->if_xname); 3984 if (len > 4) { 3985 addlog(": "); 3986 sppp_print_string((char *)(h + 1), len - 4); 3987 } 3988 addlog("\n"); 3989 } else 3990 log(LOG_INFO, "%s: chap failure\n", 3991 ifp->if_xname); 3992 /* await LCP shutdown by authenticator */ 3993 break; 3994 3995 /* response is my authproto */ 3996 case CHAP_RESPONSE: 3997 if (sp->hisauth.secret == NULL) { 3998 /* can't do anything useful */ 3999 printf("%s: chap input without his secret being set\n", 4000 ifp->if_xname); 4001 break; 4002 } 4003 value = 1 + (u_char *)(h + 1); 4004 value_len = value[-1]; 4005 name = value + value_len; 4006 name_len = len - value_len - 5; 4007 if (name_len < 0) { 4008 if (debug) { 4009 log(LOG_DEBUG, 4010 "%s: chap corrupted response " 4011 "<%s id=0x%x len=%d", 4012 ifp->if_xname, 4013 sppp_auth_type_name(PPP_CHAP, h->type), 4014 h->ident, ntohs(h->len)); 4015 if (len > 4) 4016 sppp_print_bytes((u_char *)(h + 1), 4017 len - 4); 4018 addlog(">\n"); 4019 } 4020 break; 4021 } 4022 if (h->ident != sp->confid[IDX_CHAP]) { 4023 if (debug) 4024 log(LOG_DEBUG, 4025 "%s: chap dropping response for old ID " 4026 "(got %d, expected %d)\n", 4027 ifp->if_xname, 4028 h->ident, sp->confid[IDX_CHAP]); 4029 break; 4030 } 4031 if (sp->hisauth.name != NULL && 4032 (name_len != sp->hisauth.name_len 4033 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4034 log(LOG_INFO, "%s: chap response, his name ", 4035 ifp->if_xname); 4036 sppp_print_string(name, name_len); 4037 addlog(" != expected "); 4038 sppp_print_string(sp->hisauth.name, 4039 sp->hisauth.name_len); 4040 addlog("\n"); 4041 goto chap_failure; 4042 } 4043 if (debug) { 4044 log(LOG_DEBUG, "%s: chap input(%s) " 4045 "<%s id=0x%x len=%d name=", 4046 ifp->if_xname, 4047 sppp_state_name(sp->state[IDX_CHAP]), 4048 sppp_auth_type_name(PPP_CHAP, h->type), 4049 h->ident, ntohs(h->len)); 4050 sppp_print_string((char *)name, name_len); 4051 addlog(" value-size=%d value=", value_len); 4052 sppp_print_bytes(value, value_len); 4053 addlog(">\n"); 4054 } 4055 if (value_len != sizeof(sp->myauth.challenge)) { 4056 if (debug) 4057 log(LOG_DEBUG, 4058 "%s: chap bad hash value length: " 4059 "%d bytes, should be %ld\n", 4060 ifp->if_xname, value_len, 4061 (long) sizeof(sp->myauth.challenge)); 4062 goto chap_failure; 4063 } 4064 4065 MD5Init(&ctx); 4066 MD5Update(&ctx, &h->ident, 1); 4067 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4068 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 4069 MD5Final(digest, &ctx); 4070 4071 #define FAILMSG "Failed..." 4072 #define SUCCMSG "Welcome!" 4073 4074 if (value_len != sizeof digest || 4075 memcmp(digest, value, value_len) != 0) { 4076 chap_failure: 4077 /* action scn, tld */ 4078 x = splnet(); 4079 sp->pp_auth_failures++; 4080 splx(x); 4081 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4082 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4083 0); 4084 chap.tld(sp); 4085 break; 4086 } 4087 sp->pp_auth_failures = 0; 4088 /* action sca, perhaps tlu */ 4089 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4090 sp->state[IDX_CHAP] == STATE_OPENED) 4091 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4092 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4093 0); 4094 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4095 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4096 chap.tlu(sp); 4097 } 4098 break; 4099 4100 default: 4101 /* Unknown CHAP packet type -- ignore. */ 4102 if (debug) { 4103 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4104 "<0x%x id=0x%xh len=%d", 4105 ifp->if_xname, 4106 sppp_state_name(sp->state[IDX_CHAP]), 4107 h->type, h->ident, ntohs(h->len)); 4108 if (len > 4) 4109 sppp_print_bytes((u_char *)(h + 1), len - 4); 4110 addlog(">\n"); 4111 } 4112 break; 4113 4114 } 4115 } 4116 4117 static void 4118 sppp_chap_init(struct sppp *sp) 4119 { 4120 /* Chap doesn't have STATE_INITIAL at all. */ 4121 sp->state[IDX_CHAP] = STATE_CLOSED; 4122 sp->fail_counter[IDX_CHAP] = 0; 4123 sp->pp_seq[IDX_CHAP] = 0; 4124 sp->pp_rseq[IDX_CHAP] = 0; 4125 callout_init(&sp->ch[IDX_CHAP], 0); 4126 } 4127 4128 static void 4129 sppp_chap_open(struct sppp *sp) 4130 { 4131 if (sp->myauth.proto == PPP_CHAP && 4132 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4133 /* we are authenticator for CHAP, start it */ 4134 chap.scr(sp); 4135 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4136 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4137 } 4138 /* nothing to be done if we are peer, await a challenge */ 4139 } 4140 4141 static void 4142 sppp_chap_close(struct sppp *sp) 4143 { 4144 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4145 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4146 } 4147 4148 static void 4149 sppp_chap_TO(void *cookie) 4150 { 4151 struct sppp *sp = (struct sppp *)cookie; 4152 STDDCL; 4153 int s; 4154 4155 s = splnet(); 4156 if (debug) 4157 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4158 ifp->if_xname, 4159 sppp_state_name(sp->state[IDX_CHAP]), 4160 sp->rst_counter[IDX_CHAP]); 4161 4162 if (--sp->rst_counter[IDX_CHAP] < 0) 4163 /* TO- event */ 4164 switch (sp->state[IDX_CHAP]) { 4165 case STATE_REQ_SENT: 4166 chap.tld(sp); 4167 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4168 break; 4169 } 4170 else 4171 /* TO+ (or TO*) event */ 4172 switch (sp->state[IDX_CHAP]) { 4173 case STATE_OPENED: 4174 /* TO* event */ 4175 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4176 /* fall through */ 4177 case STATE_REQ_SENT: 4178 chap.scr(sp); 4179 /* sppp_cp_change_state() will restart the timer */ 4180 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4181 break; 4182 } 4183 4184 splx(s); 4185 } 4186 4187 static void 4188 sppp_chap_tlu(struct sppp *sp) 4189 { 4190 STDDCL; 4191 int i, x; 4192 4193 i = 0; 4194 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4195 4196 /* 4197 * Some broken CHAP implementations (Conware CoNet, firmware 4198 * 4.0.?) don't want to re-authenticate their CHAP once the 4199 * initial challenge-response exchange has taken place. 4200 * Provide for an option to avoid rechallenges. 4201 */ 4202 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4203 /* 4204 * Compute the re-challenge timeout. This will yield 4205 * a number between 300 and 810 seconds. 4206 */ 4207 i = 300 + ((unsigned)(cprng_fast32() & 0xff00) >> 7); 4208 4209 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4210 } 4211 4212 if (debug) { 4213 log(LOG_DEBUG, 4214 "%s: chap %s, ", 4215 ifp->if_xname, 4216 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4217 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4218 addlog("next re-challenge in %d seconds\n", i); 4219 else 4220 addlog("re-challenging supressed\n"); 4221 } 4222 4223 x = splnet(); 4224 sp->pp_auth_failures = 0; 4225 /* indicate to LCP that we need to be closed down */ 4226 sp->lcp.protos |= (1 << IDX_CHAP); 4227 4228 if (sp->pp_flags & PP_NEEDAUTH) { 4229 /* 4230 * Remote is authenticator, but his auth proto didn't 4231 * complete yet. Defer the transition to network 4232 * phase. 4233 */ 4234 splx(x); 4235 return; 4236 } 4237 splx(x); 4238 4239 /* 4240 * If we are already in phase network, we are done here. This 4241 * is the case if this is a dummy tlu event after a re-challenge. 4242 */ 4243 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4244 sppp_phase_network(sp); 4245 } 4246 4247 static void 4248 sppp_chap_tld(struct sppp *sp) 4249 { 4250 STDDCL; 4251 4252 if (debug) 4253 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4254 callout_stop(&sp->ch[IDX_CHAP]); 4255 sp->lcp.protos &= ~(1 << IDX_CHAP); 4256 4257 lcp.Close(sp); 4258 } 4259 4260 static void 4261 sppp_chap_scr(struct sppp *sp) 4262 { 4263 uint32_t *ch; 4264 u_char clen = 4 * sizeof(uint32_t); 4265 4266 if (sp->myauth.name == NULL) { 4267 /* can't do anything useful */ 4268 printf("%s: chap starting without my name being set\n", 4269 sp->pp_if.if_xname); 4270 return; 4271 } 4272 4273 /* Compute random challenge. */ 4274 ch = (uint32_t *)sp->myauth.challenge; 4275 cprng_strong(kern_cprng, ch, clen, 0); 4276 4277 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4278 4279 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4280 sizeof clen, (const char *)&clen, 4281 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4282 sp->myauth.name_len, 4283 sp->myauth.name, 4284 0); 4285 } 4286 4287 /* 4288 *--------------------------------------------------------------------------* 4289 * * 4290 * The PAP implementation. * 4291 * * 4292 *--------------------------------------------------------------------------* 4293 */ 4294 /* 4295 * For PAP, we need to keep a little state also if we are the peer, not the 4296 * authenticator. This is since we don't get a request to authenticate, but 4297 * have to repeatedly authenticate ourself until we got a response (or the 4298 * retry counter is expired). 4299 */ 4300 4301 /* 4302 * Handle incoming PAP packets. */ 4303 static void 4304 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4305 { 4306 STDDCL; 4307 struct lcp_header *h; 4308 int len, x; 4309 u_char mlen; 4310 char *name, *secret; 4311 int name_len, secret_len; 4312 4313 /* 4314 * Malicious input might leave this uninitialized, so 4315 * init to an impossible value. 4316 */ 4317 secret_len = -1; 4318 4319 len = m->m_pkthdr.len; 4320 if (len < 5) { 4321 if (debug) 4322 log(LOG_DEBUG, 4323 "%s: pap invalid packet length: %d bytes\n", 4324 ifp->if_xname, len); 4325 return; 4326 } 4327 h = mtod(m, struct lcp_header *); 4328 if (len > ntohs(h->len)) 4329 len = ntohs(h->len); 4330 switch (h->type) { 4331 /* PAP request is my authproto */ 4332 case PAP_REQ: 4333 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4334 /* can't do anything useful */ 4335 printf("%s: pap request without his name and his secret being set\n", 4336 ifp->if_xname); 4337 break; 4338 } 4339 name = 1 + (u_char *)(h + 1); 4340 name_len = name[-1]; 4341 secret = name + name_len + 1; 4342 if (name_len > len - 6 || 4343 (secret_len = secret[-1]) > len - 6 - name_len) { 4344 if (debug) { 4345 log(LOG_DEBUG, "%s: pap corrupted input " 4346 "<%s id=0x%x len=%d", 4347 ifp->if_xname, 4348 sppp_auth_type_name(PPP_PAP, h->type), 4349 h->ident, ntohs(h->len)); 4350 if (len > 4) 4351 sppp_print_bytes((u_char *)(h + 1), 4352 len - 4); 4353 addlog(">\n"); 4354 } 4355 break; 4356 } 4357 if (debug) { 4358 log(LOG_DEBUG, "%s: pap input(%s) " 4359 "<%s id=0x%x len=%d name=", 4360 ifp->if_xname, 4361 sppp_state_name(sp->state[IDX_PAP]), 4362 sppp_auth_type_name(PPP_PAP, h->type), 4363 h->ident, ntohs(h->len)); 4364 sppp_print_string((char *)name, name_len); 4365 addlog(" secret="); 4366 sppp_print_string((char *)secret, secret_len); 4367 addlog(">\n"); 4368 } 4369 if (name_len != sp->hisauth.name_len || 4370 secret_len != sp->hisauth.secret_len || 4371 memcmp(name, sp->hisauth.name, name_len) != 0 || 4372 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4373 /* action scn, tld */ 4374 sp->pp_auth_failures++; 4375 mlen = sizeof(FAILMSG) - 1; 4376 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4377 sizeof mlen, (const char *)&mlen, 4378 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4379 0); 4380 pap.tld(sp); 4381 break; 4382 } 4383 /* action sca, perhaps tlu */ 4384 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4385 sp->state[IDX_PAP] == STATE_OPENED) { 4386 mlen = sizeof(SUCCMSG) - 1; 4387 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4388 sizeof mlen, (const char *)&mlen, 4389 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4390 0); 4391 } 4392 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4393 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4394 pap.tlu(sp); 4395 } 4396 break; 4397 4398 /* ack and nak are his authproto */ 4399 case PAP_ACK: 4400 callout_stop(&sp->pap_my_to_ch); 4401 if (debug) { 4402 log(LOG_DEBUG, "%s: pap success", 4403 ifp->if_xname); 4404 name = 1 + (u_char *)(h + 1); 4405 name_len = name[-1]; 4406 if (len > 5 && name_len < len+4) { 4407 addlog(": "); 4408 sppp_print_string(name, name_len); 4409 } 4410 addlog("\n"); 4411 } 4412 x = splnet(); 4413 sp->pp_auth_failures = 0; 4414 sp->pp_flags &= ~PP_NEEDAUTH; 4415 if (sp->myauth.proto == PPP_PAP && 4416 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4417 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4418 /* 4419 * We are authenticator for PAP but didn't 4420 * complete yet. Leave it to tlu to proceed 4421 * to network phase. 4422 */ 4423 splx(x); 4424 break; 4425 } 4426 splx(x); 4427 sppp_phase_network(sp); 4428 break; 4429 4430 case PAP_NAK: 4431 callout_stop(&sp->pap_my_to_ch); 4432 sp->pp_auth_failures++; 4433 if (debug) { 4434 log(LOG_INFO, "%s: pap failure", 4435 ifp->if_xname); 4436 name = 1 + (u_char *)(h + 1); 4437 name_len = name[-1]; 4438 if (len > 5 && name_len < len+4) { 4439 addlog(": "); 4440 sppp_print_string(name, name_len); 4441 } 4442 addlog("\n"); 4443 } else 4444 log(LOG_INFO, "%s: pap failure\n", 4445 ifp->if_xname); 4446 /* await LCP shutdown by authenticator */ 4447 break; 4448 4449 default: 4450 /* Unknown PAP packet type -- ignore. */ 4451 if (debug) { 4452 log(LOG_DEBUG, "%s: pap corrupted input " 4453 "<0x%x id=0x%x len=%d", 4454 ifp->if_xname, 4455 h->type, h->ident, ntohs(h->len)); 4456 if (len > 4) 4457 sppp_print_bytes((u_char *)(h + 1), len - 4); 4458 addlog(">\n"); 4459 } 4460 break; 4461 4462 } 4463 } 4464 4465 static void 4466 sppp_pap_init(struct sppp *sp) 4467 { 4468 /* PAP doesn't have STATE_INITIAL at all. */ 4469 sp->state[IDX_PAP] = STATE_CLOSED; 4470 sp->fail_counter[IDX_PAP] = 0; 4471 sp->pp_seq[IDX_PAP] = 0; 4472 sp->pp_rseq[IDX_PAP] = 0; 4473 callout_init(&sp->ch[IDX_PAP], 0); 4474 callout_init(&sp->pap_my_to_ch, 0); 4475 } 4476 4477 static void 4478 sppp_pap_open(struct sppp *sp) 4479 { 4480 if (sp->hisauth.proto == PPP_PAP && 4481 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4482 /* we are authenticator for PAP, start our timer */ 4483 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4484 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4485 } 4486 if (sp->myauth.proto == PPP_PAP) { 4487 /* we are peer, send a request, and start a timer */ 4488 pap.scr(sp); 4489 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4490 sppp_pap_my_TO, sp); 4491 } 4492 } 4493 4494 static void 4495 sppp_pap_close(struct sppp *sp) 4496 { 4497 if (sp->state[IDX_PAP] != STATE_CLOSED) 4498 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4499 } 4500 4501 /* 4502 * That's the timeout routine if we are authenticator. Since the 4503 * authenticator is basically passive in PAP, we can't do much here. 4504 */ 4505 static void 4506 sppp_pap_TO(void *cookie) 4507 { 4508 struct sppp *sp = (struct sppp *)cookie; 4509 STDDCL; 4510 int s; 4511 4512 s = splnet(); 4513 if (debug) 4514 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4515 ifp->if_xname, 4516 sppp_state_name(sp->state[IDX_PAP]), 4517 sp->rst_counter[IDX_PAP]); 4518 4519 if (--sp->rst_counter[IDX_PAP] < 0) 4520 /* TO- event */ 4521 switch (sp->state[IDX_PAP]) { 4522 case STATE_REQ_SENT: 4523 pap.tld(sp); 4524 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4525 break; 4526 } 4527 else 4528 /* TO+ event, not very much we could do */ 4529 switch (sp->state[IDX_PAP]) { 4530 case STATE_REQ_SENT: 4531 /* sppp_cp_change_state() will restart the timer */ 4532 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4533 break; 4534 } 4535 4536 splx(s); 4537 } 4538 4539 /* 4540 * That's the timeout handler if we are peer. Since the peer is active, 4541 * we need to retransmit our PAP request since it is apparently lost. 4542 * XXX We should impose a max counter. 4543 */ 4544 static void 4545 sppp_pap_my_TO(void *cookie) 4546 { 4547 struct sppp *sp = (struct sppp *)cookie; 4548 STDDCL; 4549 4550 if (debug) 4551 log(LOG_DEBUG, "%s: pap peer TO\n", 4552 ifp->if_xname); 4553 4554 pap.scr(sp); 4555 } 4556 4557 static void 4558 sppp_pap_tlu(struct sppp *sp) 4559 { 4560 STDDCL; 4561 int x; 4562 4563 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4564 4565 if (debug) 4566 log(LOG_DEBUG, "%s: %s tlu\n", 4567 ifp->if_xname, pap.name); 4568 4569 x = splnet(); 4570 sp->pp_auth_failures = 0; 4571 /* indicate to LCP that we need to be closed down */ 4572 sp->lcp.protos |= (1 << IDX_PAP); 4573 4574 if (sp->pp_flags & PP_NEEDAUTH) { 4575 /* 4576 * Remote is authenticator, but his auth proto didn't 4577 * complete yet. Defer the transition to network 4578 * phase. 4579 */ 4580 splx(x); 4581 return; 4582 } 4583 splx(x); 4584 sppp_phase_network(sp); 4585 } 4586 4587 static void 4588 sppp_pap_tld(struct sppp *sp) 4589 { 4590 STDDCL; 4591 4592 if (debug) 4593 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4594 callout_stop(&sp->ch[IDX_PAP]); 4595 callout_stop(&sp->pap_my_to_ch); 4596 sp->lcp.protos &= ~(1 << IDX_PAP); 4597 4598 lcp.Close(sp); 4599 } 4600 4601 static void 4602 sppp_pap_scr(struct sppp *sp) 4603 { 4604 u_char idlen, pwdlen; 4605 4606 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4607 /* can't do anything useful */ 4608 printf("%s: pap starting without my name and secret being set\n", 4609 sp->pp_if.if_xname); 4610 return; 4611 } 4612 4613 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4614 pwdlen = sp->myauth.secret_len; 4615 idlen = sp->myauth.name_len; 4616 4617 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4618 sizeof idlen, (const char *)&idlen, 4619 idlen, sp->myauth.name, 4620 sizeof pwdlen, (const char *)&pwdlen, 4621 pwdlen, sp->myauth.secret, 4622 0); 4623 } 4624 4625 /* 4626 * Random miscellaneous functions. 4627 */ 4628 4629 /* 4630 * Send a PAP or CHAP proto packet. 4631 * 4632 * Varadic function, each of the elements for the ellipsis is of type 4633 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4634 * mlen == 0. 4635 * NOTE: never declare variadic functions with types subject to type 4636 * promotion (i.e. u_char). This is asking for big trouble depending 4637 * on the architecture you are on... 4638 */ 4639 4640 static void 4641 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4642 unsigned int type, unsigned int id, 4643 ...) 4644 { 4645 STDDCL; 4646 struct lcp_header *lh; 4647 struct mbuf *m; 4648 u_char *p; 4649 int len; 4650 size_t pkthdrlen; 4651 unsigned int mlen; 4652 const char *msg; 4653 va_list ap; 4654 4655 MGETHDR(m, M_DONTWAIT, MT_DATA); 4656 if (! m) 4657 return; 4658 m->m_pkthdr.rcvif = 0; 4659 4660 if (sp->pp_flags & PP_NOFRAMING) { 4661 *mtod(m, uint16_t *) = htons(cp->proto); 4662 pkthdrlen = 2; 4663 lh = (struct lcp_header *)(mtod(m, uint8_t *)+2); 4664 } else { 4665 struct ppp_header *h; 4666 h = mtod(m, struct ppp_header *); 4667 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4668 h->control = PPP_UI; /* Unnumbered Info */ 4669 h->protocol = htons(cp->proto); 4670 pkthdrlen = PPP_HEADER_LEN; 4671 4672 lh = (struct lcp_header *)(h + 1); 4673 } 4674 4675 lh->type = type; 4676 lh->ident = id; 4677 p = (u_char *)(lh + 1); 4678 4679 va_start(ap, id); 4680 len = 0; 4681 4682 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4683 msg = va_arg(ap, const char *); 4684 len += mlen; 4685 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4686 va_end(ap); 4687 m_freem(m); 4688 return; 4689 } 4690 4691 memcpy(p, msg, mlen); 4692 p += mlen; 4693 } 4694 va_end(ap); 4695 4696 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4697 lh->len = htons(LCP_HEADER_LEN + len); 4698 4699 if (debug) { 4700 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4701 ifp->if_xname, cp->name, 4702 sppp_auth_type_name(cp->proto, lh->type), 4703 lh->ident, ntohs(lh->len)); 4704 if (len) 4705 sppp_print_bytes((u_char *)(lh + 1), len); 4706 addlog(">\n"); 4707 } 4708 if (IF_QFULL(&sp->pp_cpq)) { 4709 IF_DROP(&sp->pp_fastq); 4710 IF_DROP(&ifp->if_snd); 4711 m_freem(m); 4712 ++ifp->if_oerrors; 4713 return; 4714 } else 4715 IF_ENQUEUE(&sp->pp_cpq, m); 4716 if (! (ifp->if_flags & IFF_OACTIVE)) 4717 (*ifp->if_start)(ifp); 4718 ifp->if_obytes += m->m_pkthdr.len + 3; 4719 } 4720 4721 /* 4722 * Send keepalive packets, every 10 seconds. 4723 */ 4724 static void 4725 sppp_keepalive(void *dummy) 4726 { 4727 struct sppp *sp; 4728 int s; 4729 time_t now; 4730 4731 s = splnet(); 4732 now = time_uptime; 4733 for (sp=spppq; sp; sp=sp->pp_next) { 4734 struct ifnet *ifp = &sp->pp_if; 4735 4736 /* check idle timeout */ 4737 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4738 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4739 /* idle timeout is enabled for this interface */ 4740 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4741 if (ifp->if_flags & IFF_DEBUG) 4742 printf("%s: no activity for %lu seconds\n", 4743 sp->pp_if.if_xname, 4744 (unsigned long)(now-sp->pp_last_activity)); 4745 lcp.Close(sp); 4746 continue; 4747 } 4748 } 4749 4750 /* Keepalive mode disabled or channel down? */ 4751 if (! (sp->pp_flags & PP_KEEPALIVE) || 4752 ! (ifp->if_flags & IFF_RUNNING)) 4753 continue; 4754 4755 /* No keepalive in PPP mode if LCP not opened yet. */ 4756 if (! (sp->pp_flags & PP_CISCO) && 4757 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4758 continue; 4759 4760 /* No echo reply, but maybe user data passed through? */ 4761 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4762 sp->pp_alivecnt = 0; 4763 continue; 4764 } 4765 4766 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4767 /* No keepalive packets got. Stop the interface. */ 4768 if_down (ifp); 4769 IF_PURGE(&sp->pp_cpq); 4770 if (! (sp->pp_flags & PP_CISCO)) { 4771 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4772 ifp->if_xname); 4773 sp->pp_alivecnt = 0; 4774 4775 /* we are down, close all open protocols */ 4776 lcp.Close(sp); 4777 4778 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4779 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4780 4781 /* Close connection immediately, completition of this 4782 * will summon the magic needed to reestablish it. */ 4783 if (sp->pp_tlf) 4784 sp->pp_tlf(sp); 4785 continue; 4786 } 4787 } 4788 if (sp->pp_alivecnt < sp->pp_maxalive) 4789 ++sp->pp_alivecnt; 4790 if (sp->pp_flags & PP_CISCO) 4791 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4792 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4793 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4794 int32_t nmagic = htonl(sp->lcp.magic); 4795 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4796 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4797 sp->lcp.echoid, 4, &nmagic); 4798 } 4799 } 4800 splx(s); 4801 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4802 } 4803 4804 #ifdef INET 4805 /* 4806 * Get both IP addresses. 4807 */ 4808 static void 4809 sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, uint32_t *srcmask) 4810 { 4811 struct ifnet *ifp = &sp->pp_if; 4812 struct ifaddr *ifa; 4813 struct sockaddr_in *si, *sm; 4814 uint32_t ssrc, ddst; 4815 4816 sm = NULL; 4817 ssrc = ddst = 0; 4818 /* 4819 * Pick the first AF_INET address from the list, 4820 * aliases don't make any sense on a p2p link anyway. 4821 */ 4822 si = 0; 4823 IFADDR_FOREACH(ifa, ifp) { 4824 if (ifa->ifa_addr->sa_family == AF_INET) { 4825 si = (struct sockaddr_in *)ifa->ifa_addr; 4826 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4827 if (si) 4828 break; 4829 } 4830 } 4831 if (ifa) { 4832 if (si && si->sin_addr.s_addr) { 4833 ssrc = si->sin_addr.s_addr; 4834 if (srcmask) 4835 *srcmask = ntohl(sm->sin_addr.s_addr); 4836 } 4837 4838 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4839 if (si && si->sin_addr.s_addr) 4840 ddst = si->sin_addr.s_addr; 4841 } 4842 4843 if (dst) *dst = ntohl(ddst); 4844 if (src) *src = ntohl(ssrc); 4845 } 4846 4847 /* 4848 * Set IP addresses. Must be called at splnet. 4849 * If an address is 0, leave it the way it is. 4850 */ 4851 static void 4852 sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr) 4853 { 4854 STDDCL; 4855 struct ifaddr *ifa; 4856 struct sockaddr_in *si, *dest; 4857 4858 /* 4859 * Pick the first AF_INET address from the list, 4860 * aliases don't make any sense on a p2p link anyway. 4861 */ 4862 4863 IFADDR_FOREACH(ifa, ifp) { 4864 if (ifa->ifa_addr->sa_family == AF_INET) { 4865 si = (struct sockaddr_in *)ifa->ifa_addr; 4866 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4867 goto found; 4868 } 4869 } 4870 return; 4871 4872 found: 4873 { 4874 int error; 4875 struct sockaddr_in new_sin = *si; 4876 struct sockaddr_in new_dst = *dest; 4877 4878 /* 4879 * Scrub old routes now instead of calling in_ifinit with 4880 * scrub=1, because we may change the dstaddr 4881 * before the call to in_ifinit. 4882 */ 4883 in_ifscrub(ifp, ifatoia(ifa)); 4884 4885 if (myaddr != 0) 4886 new_sin.sin_addr.s_addr = htonl(myaddr); 4887 if (hisaddr != 0) { 4888 new_dst.sin_addr.s_addr = htonl(hisaddr); 4889 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4890 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4891 *dest = new_dst; /* fix dstaddr in place */ 4892 } 4893 } 4894 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4895 if (debug && error) 4896 { 4897 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4898 " failed, error=%d\n", ifp->if_xname, error); 4899 } 4900 if (!error) { 4901 (void)pfil_run_hooks(if_pfil, 4902 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4903 } 4904 } 4905 } 4906 4907 /* 4908 * Clear IP addresses. Must be called at splnet. 4909 */ 4910 static void 4911 sppp_clear_ip_addrs(struct sppp *sp) 4912 { 4913 struct ifnet *ifp = &sp->pp_if; 4914 struct ifaddr *ifa; 4915 struct sockaddr_in *si, *dest; 4916 4917 uint32_t remote; 4918 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4919 remote = sp->ipcp.saved_hisaddr; 4920 else 4921 sppp_get_ip_addrs(sp, 0, &remote, 0); 4922 4923 /* 4924 * Pick the first AF_INET address from the list, 4925 * aliases don't make any sense on a p2p link anyway. 4926 */ 4927 4928 IFADDR_FOREACH(ifa, ifp) { 4929 if (ifa->ifa_addr->sa_family == AF_INET) { 4930 si = (struct sockaddr_in *)ifa->ifa_addr; 4931 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4932 goto found; 4933 } 4934 } 4935 return; 4936 4937 found: 4938 { 4939 struct sockaddr_in new_sin = *si; 4940 4941 in_ifscrub(ifp, ifatoia(ifa)); 4942 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4943 new_sin.sin_addr.s_addr = 0; 4944 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4945 /* replace peer addr in place */ 4946 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4947 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4948 (void)pfil_run_hooks(if_pfil, 4949 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4950 } 4951 } 4952 #endif 4953 4954 #ifdef INET6 4955 /* 4956 * Get both IPv6 addresses. 4957 */ 4958 static void 4959 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4960 struct in6_addr *srcmask) 4961 { 4962 struct ifnet *ifp = &sp->pp_if; 4963 struct ifaddr *ifa; 4964 struct sockaddr_in6 *si, *sm; 4965 struct in6_addr ssrc, ddst; 4966 4967 sm = NULL; 4968 memset(&ssrc, 0, sizeof(ssrc)); 4969 memset(&ddst, 0, sizeof(ddst)); 4970 /* 4971 * Pick the first link-local AF_INET6 address from the list, 4972 * aliases don't make any sense on a p2p link anyway. 4973 */ 4974 si = 0; 4975 IFADDR_FOREACH(ifa, ifp) 4976 if (ifa->ifa_addr->sa_family == AF_INET6) { 4977 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4978 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4979 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4980 break; 4981 } 4982 if (ifa) { 4983 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4984 memcpy(&ssrc, &si->sin6_addr, sizeof(ssrc)); 4985 if (srcmask) { 4986 memcpy(srcmask, &sm->sin6_addr, 4987 sizeof(*srcmask)); 4988 } 4989 } 4990 4991 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4992 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4993 memcpy(&ddst, &si->sin6_addr, sizeof(ddst)); 4994 } 4995 4996 if (dst) 4997 memcpy(dst, &ddst, sizeof(*dst)); 4998 if (src) 4999 memcpy(src, &ssrc, sizeof(*src)); 5000 } 5001 5002 #ifdef IPV6CP_MYIFID_DYN 5003 /* 5004 * Generate random ifid. 5005 */ 5006 static void 5007 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5008 { 5009 /* TBD */ 5010 } 5011 5012 /* 5013 * Set my IPv6 address. Must be called at splnet. 5014 */ 5015 static void 5016 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5017 { 5018 STDDCL; 5019 struct ifaddr *ifa; 5020 struct sockaddr_in6 *sin6; 5021 5022 /* 5023 * Pick the first link-local AF_INET6 address from the list, 5024 * aliases don't make any sense on a p2p link anyway. 5025 */ 5026 5027 sin6 = NULL; 5028 IFADDR_FOREACH(ifa, ifp) 5029 { 5030 if (ifa->ifa_addr->sa_family == AF_INET6) 5031 { 5032 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5033 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5034 break; 5035 } 5036 } 5037 5038 if (ifa && sin6) 5039 { 5040 int error; 5041 struct sockaddr_in6 new_sin6 = *sin6; 5042 5043 memcpy(&new_sin6.sin6_addr, src, sizeof(new_sin6.sin6_addr)); 5044 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5045 if (debug && error) 5046 { 5047 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 5048 " failed, error=%d\n", ifp->if_xname, error); 5049 } 5050 if (!error) { 5051 (void)pfil_run_hooks(if_pfil, 5052 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 5053 } 5054 } 5055 } 5056 #endif 5057 5058 /* 5059 * Suggest a candidate address to be used by peer. 5060 */ 5061 static void 5062 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5063 { 5064 struct in6_addr myaddr; 5065 struct timeval tv; 5066 5067 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5068 5069 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5070 microtime(&tv); 5071 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5072 myaddr.s6_addr[14] ^= 0xff; 5073 myaddr.s6_addr[15] ^= 0xff; 5074 } else { 5075 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5076 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5077 } 5078 if (suggest) 5079 memcpy(suggest, &myaddr, sizeof(myaddr)); 5080 } 5081 #endif /*INET6*/ 5082 5083 /* 5084 * Process ioctl requests specific to the PPP interface. 5085 * Permissions have already been checked. 5086 */ 5087 static int 5088 sppp_params(struct sppp *sp, u_long cmd, void *data) 5089 { 5090 switch (cmd) { 5091 case SPPPGETAUTHCFG: 5092 { 5093 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5094 int error; 5095 size_t len; 5096 5097 cfg->myauthflags = sp->myauth.flags; 5098 cfg->hisauthflags = sp->hisauth.flags; 5099 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5100 cfg->hisauth = 0; 5101 if (sp->hisauth.proto) 5102 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5103 cfg->myauth = 0; 5104 if (sp->myauth.proto) 5105 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5106 if (cfg->myname_length == 0) { 5107 if (sp->myauth.name != NULL) 5108 cfg->myname_length = sp->myauth.name_len + 1; 5109 } else { 5110 if (sp->myauth.name == NULL) { 5111 cfg->myname_length = 0; 5112 } else { 5113 len = sp->myauth.name_len + 1; 5114 if (cfg->myname_length < len) 5115 return (ENAMETOOLONG); 5116 error = copyout(sp->myauth.name, cfg->myname, len); 5117 if (error) return error; 5118 } 5119 } 5120 if (cfg->hisname_length == 0) { 5121 if (sp->hisauth.name != NULL) 5122 cfg->hisname_length = sp->hisauth.name_len + 1; 5123 } else { 5124 if (sp->hisauth.name == NULL) { 5125 cfg->hisname_length = 0; 5126 } else { 5127 len = sp->hisauth.name_len + 1; 5128 if (cfg->hisname_length < len) 5129 return (ENAMETOOLONG); 5130 error = copyout(sp->hisauth.name, cfg->hisname, len); 5131 if (error) return error; 5132 } 5133 } 5134 } 5135 break; 5136 case SPPPSETAUTHCFG: 5137 { 5138 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5139 int error; 5140 5141 if (sp->myauth.name) { 5142 free(sp->myauth.name, M_DEVBUF); 5143 sp->myauth.name = NULL; 5144 } 5145 if (sp->myauth.secret) { 5146 free(sp->myauth.secret, M_DEVBUF); 5147 sp->myauth.secret = NULL; 5148 } 5149 if (sp->hisauth.name) { 5150 free(sp->hisauth.name, M_DEVBUF); 5151 sp->hisauth.name = NULL; 5152 } 5153 if (sp->hisauth.secret) { 5154 free(sp->hisauth.secret, M_DEVBUF); 5155 sp->hisauth.secret = NULL; 5156 } 5157 5158 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5159 if (cfg->hisname_length >= MCLBYTES) 5160 return (ENAMETOOLONG); 5161 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5162 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5163 if (error) { 5164 free(sp->hisauth.name, M_DEVBUF); 5165 sp->hisauth.name = NULL; 5166 return error; 5167 } 5168 sp->hisauth.name_len = cfg->hisname_length - 1; 5169 sp->hisauth.name[sp->hisauth.name_len] = 0; 5170 } 5171 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5172 if (cfg->hissecret_length >= MCLBYTES) 5173 return (ENAMETOOLONG); 5174 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5175 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5176 if (error) { 5177 free(sp->hisauth.secret, M_DEVBUF); 5178 sp->hisauth.secret = NULL; 5179 return error; 5180 } 5181 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5182 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5183 } 5184 if (cfg->myname != NULL && cfg->myname_length > 0) { 5185 if (cfg->myname_length >= MCLBYTES) 5186 return (ENAMETOOLONG); 5187 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5188 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5189 if (error) { 5190 free(sp->myauth.name, M_DEVBUF); 5191 sp->myauth.name = NULL; 5192 return error; 5193 } 5194 sp->myauth.name_len = cfg->myname_length - 1; 5195 sp->myauth.name[sp->myauth.name_len] = 0; 5196 } 5197 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5198 if (cfg->mysecret_length >= MCLBYTES) 5199 return (ENAMETOOLONG); 5200 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5201 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5202 if (error) { 5203 free(sp->myauth.secret, M_DEVBUF); 5204 sp->myauth.secret = NULL; 5205 return error; 5206 } 5207 sp->myauth.secret_len = cfg->mysecret_length - 1; 5208 sp->myauth.secret[sp->myauth.secret_len] = 0; 5209 } 5210 sp->myauth.flags = cfg->myauthflags; 5211 if (cfg->myauth) 5212 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5213 sp->hisauth.flags = cfg->hisauthflags; 5214 if (cfg->hisauth) 5215 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5216 sp->pp_auth_failures = 0; 5217 if (sp->hisauth.proto != 0) 5218 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5219 else 5220 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5221 } 5222 break; 5223 case SPPPGETLCPCFG: 5224 { 5225 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5226 lcpp->lcp_timeout = sp->lcp.timeout; 5227 } 5228 break; 5229 case SPPPSETLCPCFG: 5230 { 5231 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5232 sp->lcp.timeout = lcpp->lcp_timeout; 5233 } 5234 break; 5235 case SPPPGETSTATUS: 5236 { 5237 struct spppstatus *status = (struct spppstatus *)data; 5238 status->phase = sp->pp_phase; 5239 } 5240 break; 5241 case SPPPGETSTATUSNCP: 5242 { 5243 struct spppstatusncp *status = (struct spppstatusncp *)data; 5244 status->phase = sp->pp_phase; 5245 status->ncpup = sppp_ncp_check(sp); 5246 } 5247 break; 5248 case SPPPGETIDLETO: 5249 { 5250 struct spppidletimeout *to = (struct spppidletimeout *)data; 5251 to->idle_seconds = sp->pp_idle_timeout; 5252 } 5253 break; 5254 case SPPPSETIDLETO: 5255 { 5256 struct spppidletimeout *to = (struct spppidletimeout *)data; 5257 sp->pp_idle_timeout = to->idle_seconds; 5258 } 5259 break; 5260 case SPPPSETAUTHFAILURE: 5261 { 5262 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5263 sp->pp_max_auth_fail = afsettings->max_failures; 5264 sp->pp_auth_failures = 0; 5265 } 5266 break; 5267 case SPPPGETAUTHFAILURES: 5268 { 5269 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5270 stats->auth_failures = sp->pp_auth_failures; 5271 stats->max_failures = sp->pp_max_auth_fail; 5272 } 5273 break; 5274 case SPPPSETDNSOPTS: 5275 { 5276 struct spppdnssettings *req = (struct spppdnssettings *)data; 5277 sp->query_dns = req->query_dns & 3; 5278 } 5279 break; 5280 case SPPPGETDNSOPTS: 5281 { 5282 struct spppdnssettings *req = (struct spppdnssettings *)data; 5283 req->query_dns = sp->query_dns; 5284 } 5285 break; 5286 case SPPPGETDNSADDRS: 5287 { 5288 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5289 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5290 } 5291 break; 5292 case SPPPGETKEEPALIVE: 5293 { 5294 struct spppkeepalivesettings *settings = 5295 (struct spppkeepalivesettings*)data; 5296 settings->maxalive = sp->pp_maxalive; 5297 settings->max_noreceive = sp->pp_max_noreceive; 5298 } 5299 break; 5300 case SPPPSETKEEPALIVE: 5301 { 5302 struct spppkeepalivesettings *settings = 5303 (struct spppkeepalivesettings*)data; 5304 sp->pp_maxalive = settings->maxalive; 5305 sp->pp_max_noreceive = settings->max_noreceive; 5306 } 5307 break; 5308 #if defined(COMPAT_50) || defined(MODULAR) 5309 case __SPPPGETIDLETO50: 5310 { 5311 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5312 to->idle_seconds = (uint32_t)sp->pp_idle_timeout; 5313 } 5314 break; 5315 case __SPPPSETIDLETO50: 5316 { 5317 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5318 sp->pp_idle_timeout = (time_t)to->idle_seconds; 5319 } 5320 break; 5321 case __SPPPGETKEEPALIVE50: 5322 { 5323 struct spppkeepalivesettings50 *settings = 5324 (struct spppkeepalivesettings50*)data; 5325 settings->maxalive = sp->pp_maxalive; 5326 settings->max_noreceive = (uint32_t)sp->pp_max_noreceive; 5327 } 5328 break; 5329 case __SPPPSETKEEPALIVE50: 5330 { 5331 struct spppkeepalivesettings50 *settings = 5332 (struct spppkeepalivesettings50*)data; 5333 sp->pp_maxalive = settings->maxalive; 5334 sp->pp_max_noreceive = (time_t)settings->max_noreceive; 5335 } 5336 break; 5337 #endif /* COMPAT_50 || MODULAR */ 5338 default: 5339 return (EINVAL); 5340 } 5341 5342 return (0); 5343 } 5344 5345 static void 5346 sppp_phase_network(struct sppp *sp) 5347 { 5348 int i; 5349 uint32_t mask; 5350 5351 sppp_change_phase(sp, SPPP_PHASE_NETWORK); 5352 5353 /* Notify NCPs now. */ 5354 for (i = 0; i < IDX_COUNT; i++) 5355 if ((cps[i])->flags & CP_NCP) 5356 (cps[i])->Open(sp); 5357 5358 /* Send Up events to all NCPs. */ 5359 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5360 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5361 (cps[i])->Up(sp); 5362 5363 /* if no NCP is starting, all this was in vain, close down */ 5364 sppp_lcp_check_and_close(sp); 5365 } 5366 5367 5368 static const char * 5369 sppp_cp_type_name(u_char type) 5370 { 5371 static char buf[12]; 5372 switch (type) { 5373 case CONF_REQ: return "conf-req"; 5374 case CONF_ACK: return "conf-ack"; 5375 case CONF_NAK: return "conf-nak"; 5376 case CONF_REJ: return "conf-rej"; 5377 case TERM_REQ: return "term-req"; 5378 case TERM_ACK: return "term-ack"; 5379 case CODE_REJ: return "code-rej"; 5380 case PROTO_REJ: return "proto-rej"; 5381 case ECHO_REQ: return "echo-req"; 5382 case ECHO_REPLY: return "echo-reply"; 5383 case DISC_REQ: return "discard-req"; 5384 } 5385 snprintf(buf, sizeof(buf), "0x%x", type); 5386 return buf; 5387 } 5388 5389 static const char * 5390 sppp_auth_type_name(u_short proto, u_char type) 5391 { 5392 static char buf[12]; 5393 switch (proto) { 5394 case PPP_CHAP: 5395 switch (type) { 5396 case CHAP_CHALLENGE: return "challenge"; 5397 case CHAP_RESPONSE: return "response"; 5398 case CHAP_SUCCESS: return "success"; 5399 case CHAP_FAILURE: return "failure"; 5400 } 5401 case PPP_PAP: 5402 switch (type) { 5403 case PAP_REQ: return "req"; 5404 case PAP_ACK: return "ack"; 5405 case PAP_NAK: return "nak"; 5406 } 5407 } 5408 snprintf(buf, sizeof(buf), "0x%x", type); 5409 return buf; 5410 } 5411 5412 static const char * 5413 sppp_lcp_opt_name(u_char opt) 5414 { 5415 static char buf[12]; 5416 switch (opt) { 5417 case LCP_OPT_MRU: return "mru"; 5418 case LCP_OPT_ASYNC_MAP: return "async-map"; 5419 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5420 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5421 case LCP_OPT_MAGIC: return "magic"; 5422 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5423 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5424 } 5425 snprintf(buf, sizeof(buf), "0x%x", opt); 5426 return buf; 5427 } 5428 5429 static const char * 5430 sppp_ipcp_opt_name(u_char opt) 5431 { 5432 static char buf[12]; 5433 switch (opt) { 5434 case IPCP_OPT_ADDRESSES: return "addresses"; 5435 case IPCP_OPT_COMPRESSION: return "compression"; 5436 case IPCP_OPT_ADDRESS: return "address"; 5437 } 5438 snprintf(buf, sizeof(buf), "0x%x", opt); 5439 return buf; 5440 } 5441 5442 #ifdef INET6 5443 static const char * 5444 sppp_ipv6cp_opt_name(u_char opt) 5445 { 5446 static char buf[12]; 5447 switch (opt) { 5448 case IPV6CP_OPT_IFID: return "ifid"; 5449 case IPV6CP_OPT_COMPRESSION: return "compression"; 5450 } 5451 snprintf(buf, sizeof(buf), "0x%x", opt); 5452 return buf; 5453 } 5454 #endif 5455 5456 static const char * 5457 sppp_state_name(int state) 5458 { 5459 switch (state) { 5460 case STATE_INITIAL: return "initial"; 5461 case STATE_STARTING: return "starting"; 5462 case STATE_CLOSED: return "closed"; 5463 case STATE_STOPPED: return "stopped"; 5464 case STATE_CLOSING: return "closing"; 5465 case STATE_STOPPING: return "stopping"; 5466 case STATE_REQ_SENT: return "req-sent"; 5467 case STATE_ACK_RCVD: return "ack-rcvd"; 5468 case STATE_ACK_SENT: return "ack-sent"; 5469 case STATE_OPENED: return "opened"; 5470 } 5471 return "illegal"; 5472 } 5473 5474 static const char * 5475 sppp_phase_name(int phase) 5476 { 5477 switch (phase) { 5478 case SPPP_PHASE_DEAD: return "dead"; 5479 case SPPP_PHASE_ESTABLISH: return "establish"; 5480 case SPPP_PHASE_TERMINATE: return "terminate"; 5481 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5482 case SPPP_PHASE_NETWORK: return "network"; 5483 } 5484 return "illegal"; 5485 } 5486 5487 static const char * 5488 sppp_proto_name(u_short proto) 5489 { 5490 static char buf[12]; 5491 switch (proto) { 5492 case PPP_LCP: return "lcp"; 5493 case PPP_IPCP: return "ipcp"; 5494 case PPP_PAP: return "pap"; 5495 case PPP_CHAP: return "chap"; 5496 case PPP_IPV6CP: return "ipv6cp"; 5497 } 5498 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5499 return buf; 5500 } 5501 5502 static void 5503 sppp_print_bytes(const u_char *p, u_short len) 5504 { 5505 addlog(" %02x", *p++); 5506 while (--len > 0) 5507 addlog("-%02x", *p++); 5508 } 5509 5510 static void 5511 sppp_print_string(const char *p, u_short len) 5512 { 5513 u_char c; 5514 5515 while (len-- > 0) { 5516 c = *p++; 5517 /* 5518 * Print only ASCII chars directly. RFC 1994 recommends 5519 * using only them, but we don't rely on it. */ 5520 if (c < ' ' || c > '~') 5521 addlog("\\x%x", c); 5522 else 5523 addlog("%c", c); 5524 } 5525 } 5526 5527 static const char * 5528 sppp_dotted_quad(uint32_t addr) 5529 { 5530 static char s[16]; 5531 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5532 (int)((addr >> 24) & 0xff), 5533 (int)((addr >> 16) & 0xff), 5534 (int)((addr >> 8) & 0xff), 5535 (int)(addr & 0xff)); 5536 return s; 5537 } 5538 5539 /* a dummy, used to drop uninteresting events */ 5540 static void 5541 sppp_null(struct sppp *unused) 5542 { 5543 /* do just nothing */ 5544 } 5545 /* 5546 * This file is large. Tell emacs to highlight it nevertheless. 5547 * 5548 * Local Variables: 5549 * hilit-auto-highlight-maxout: 120000 5550 * End: 5551 */ 5552
Indexes created Wed Oct 15 16:09:53 GMT 2025