if_spppsubr.c revision 1.126.6.2
1 /* $NetBSD: if_spppsubr.c,v 1.126.6.2 2014/05/18 17:46:12 rmind 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 1.126.6.2 2014/05/18 17:46:12 rmind 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 }; 449 450 451 void spppattach(int); 452 void 453 /*ARGSUSED*/ 454 spppattach(int count) 455 { 456 } 457 458 /* 459 * Exported functions, comprising our interface to the lower layer. 460 */ 461 462 /* 463 * Process the received packet. 464 */ 465 void 466 sppp_input(struct ifnet *ifp, struct mbuf *m) 467 { 468 struct ppp_header *h = NULL; 469 struct ifqueue *inq = 0; 470 uint16_t protocol; 471 int s; 472 struct sppp *sp = (struct sppp *)ifp; 473 int debug = ifp->if_flags & IFF_DEBUG; 474 int isr = 0; 475 476 if (ifp->if_flags & IFF_UP) { 477 /* Count received bytes, add hardware framing */ 478 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 479 /* Note time of last receive */ 480 sp->pp_last_receive = time_uptime; 481 } 482 483 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 484 /* Too small packet, drop it. */ 485 if (debug) 486 log(LOG_DEBUG, 487 "%s: input packet is too small, %d bytes\n", 488 ifp->if_xname, m->m_pkthdr.len); 489 drop: 490 ++ifp->if_ierrors; 491 ++ifp->if_iqdrops; 492 m_freem(m); 493 return; 494 } 495 496 if (sp->pp_flags & PP_NOFRAMING) { 497 memcpy(&protocol, mtod(m, void *), 2); 498 protocol = ntohs(protocol); 499 m_adj(m, 2); 500 } else { 501 502 /* Get PPP header. */ 503 h = mtod(m, struct ppp_header *); 504 m_adj(m, PPP_HEADER_LEN); 505 506 switch (h->address) { 507 case PPP_ALLSTATIONS: 508 if (h->control != PPP_UI) 509 goto invalid; 510 if (sp->pp_flags & PP_CISCO) { 511 if (debug) 512 log(LOG_DEBUG, 513 "%s: PPP packet in Cisco mode " 514 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 515 ifp->if_xname, 516 h->address, h->control, ntohs(h->protocol)); 517 goto drop; 518 } 519 break; 520 case CISCO_MULTICAST: 521 case CISCO_UNICAST: 522 /* Don't check the control field here (RFC 1547). */ 523 if (! (sp->pp_flags & PP_CISCO)) { 524 if (debug) 525 log(LOG_DEBUG, 526 "%s: Cisco packet in PPP mode " 527 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 528 ifp->if_xname, 529 h->address, h->control, ntohs(h->protocol)); 530 goto drop; 531 } 532 switch (ntohs(h->protocol)) { 533 default: 534 ++ifp->if_noproto; 535 goto invalid; 536 case CISCO_KEEPALIVE: 537 sppp_cisco_input((struct sppp *) ifp, m); 538 m_freem(m); 539 return; 540 #ifdef INET 541 case ETHERTYPE_IP: 542 isr = NETISR_IP; 543 inq = &ipintrq; 544 break; 545 #endif 546 #ifdef INET6 547 case ETHERTYPE_IPV6: 548 isr = NETISR_IPV6; 549 inq = &ip6intrq; 550 break; 551 #endif 552 #ifdef IPX 553 case ETHERTYPE_IPX: 554 isr = NETISR_IPX; 555 inq = &ipxintrq; 556 break; 557 #endif 558 } 559 goto queue_pkt; 560 default: /* Invalid PPP packet. */ 561 invalid: 562 if (debug) 563 log(LOG_DEBUG, 564 "%s: invalid input packet " 565 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 566 ifp->if_xname, 567 h->address, h->control, ntohs(h->protocol)); 568 goto drop; 569 } 570 protocol = ntohs(h->protocol); 571 } 572 573 switch (protocol) { 574 default: 575 if (sp->state[IDX_LCP] == STATE_OPENED) { 576 uint16_t prot = htons(protocol); 577 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 578 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 579 &prot); 580 } 581 if (debug) 582 log(LOG_DEBUG, 583 "%s: invalid input protocol " 584 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 585 ++ifp->if_noproto; 586 goto drop; 587 case PPP_LCP: 588 sppp_cp_input(&lcp, sp, m); 589 m_freem(m); 590 return; 591 case PPP_PAP: 592 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 593 sppp_pap_input(sp, m); 594 m_freem(m); 595 return; 596 case PPP_CHAP: 597 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 598 sppp_chap_input(sp, m); 599 m_freem(m); 600 return; 601 #ifdef INET 602 case PPP_IPCP: 603 if (sp->pp_phase == SPPP_PHASE_NETWORK) 604 sppp_cp_input(&ipcp, sp, m); 605 m_freem(m); 606 return; 607 case PPP_IP: 608 if (sp->state[IDX_IPCP] == STATE_OPENED) { 609 isr = NETISR_IP; 610 inq = &ipintrq; 611 sp->pp_last_activity = time_uptime; 612 } 613 break; 614 #endif 615 #ifdef INET6 616 case PPP_IPV6CP: 617 if (sp->pp_phase == SPPP_PHASE_NETWORK) 618 sppp_cp_input(&ipv6cp, sp, m); 619 m_freem(m); 620 return; 621 622 case PPP_IPV6: 623 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 624 isr = NETISR_IPV6; 625 inq = &ip6intrq; 626 sp->pp_last_activity = time_uptime; 627 } 628 break; 629 #endif 630 #ifdef IPX 631 case PPP_IPX: 632 /* IPX IPXCP not implemented yet */ 633 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 634 isr = NETISR_IPX; 635 inq = &ipxintrq; 636 } 637 break; 638 #endif 639 } 640 641 queue_pkt: 642 if (! (ifp->if_flags & IFF_UP) || ! inq) 643 goto drop; 644 645 /* Check queue. */ 646 s = splnet(); 647 if (IF_QFULL(inq)) { 648 /* Queue overflow. */ 649 IF_DROP(inq); 650 splx(s); 651 if (debug) 652 log(LOG_DEBUG, "%s: protocol queue overflow\n", 653 ifp->if_xname); 654 goto drop; 655 } 656 IF_ENQUEUE(inq, m); 657 schednetisr(isr); 658 splx(s); 659 } 660 661 /* 662 * Enqueue transmit packet. 663 */ 664 static int 665 sppp_output(struct ifnet *ifp, struct mbuf *m, 666 const struct sockaddr *dst, struct rtentry *rt) 667 { 668 struct sppp *sp = (struct sppp *) ifp; 669 struct ppp_header *h = NULL; 670 struct ifqueue *ifq = NULL; /* XXX */ 671 int s, error = 0; 672 uint16_t protocol; 673 ALTQ_DECL(struct altq_pktattr pktattr;) 674 675 s = splnet(); 676 677 sp->pp_last_activity = time_uptime; 678 679 if ((ifp->if_flags & IFF_UP) == 0 || 680 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 681 m_freem(m); 682 splx(s); 683 return (ENETDOWN); 684 } 685 686 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 687 /* 688 * Interface is not yet running, but auto-dial. Need 689 * to start LCP for it. 690 */ 691 ifp->if_flags |= IFF_RUNNING; 692 splx(s); 693 lcp.Open(sp); 694 s = splnet(); 695 } 696 697 /* 698 * If the queueing discipline needs packet classification, 699 * do it before prepending link headers. 700 */ 701 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 702 703 #ifdef INET 704 if (dst->sa_family == AF_INET) { 705 struct ip *ip = NULL; 706 struct tcphdr *th = NULL; 707 708 if (m->m_len >= sizeof(struct ip)) { 709 ip = mtod(m, struct ip *); 710 if (ip->ip_p == IPPROTO_TCP && 711 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 712 sizeof(struct tcphdr)) { 713 th = (struct tcphdr *) 714 ((char *)ip + (ip->ip_hl << 2)); 715 } 716 } else 717 ip = NULL; 718 719 /* 720 * When using dynamic local IP address assignment by using 721 * 0.0.0.0 as a local address, the first TCP session will 722 * not connect because the local TCP checksum is computed 723 * using 0.0.0.0 which will later become our real IP address 724 * so the TCP checksum computed at the remote end will 725 * become invalid. So we 726 * - don't let packets with src ip addr 0 thru 727 * - we flag TCP packets with src ip 0 as an error 728 */ 729 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 730 uint8_t proto = ip->ip_p; 731 732 m_freem(m); 733 splx(s); 734 if (proto == IPPROTO_TCP) 735 return (EADDRNOTAVAIL); 736 else 737 return (0); 738 } 739 740 /* 741 * Put low delay, telnet, rlogin and ftp control packets 742 * in front of the queue. 743 */ 744 745 if (!IF_QFULL(&sp->pp_fastq) && 746 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 747 (th && (INTERACTIVE(ntohs(th->th_sport)) || 748 INTERACTIVE(ntohs(th->th_dport)))))) 749 ifq = &sp->pp_fastq; 750 } 751 #endif 752 753 #ifdef INET6 754 if (dst->sa_family == AF_INET6) { 755 /* XXX do something tricky here? */ 756 } 757 #endif 758 759 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 760 /* 761 * Prepend general data packet PPP header. For now, IP only. 762 */ 763 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 764 if (! m) { 765 if (ifp->if_flags & IFF_DEBUG) 766 log(LOG_DEBUG, "%s: no memory for transmit header\n", 767 ifp->if_xname); 768 ++ifp->if_oerrors; 769 splx(s); 770 return (ENOBUFS); 771 } 772 /* 773 * May want to check size of packet 774 * (albeit due to the implementation it's always enough) 775 */ 776 h = mtod(m, struct ppp_header *); 777 if (sp->pp_flags & PP_CISCO) { 778 h->address = CISCO_UNICAST; /* unicast address */ 779 h->control = 0; 780 } else { 781 h->address = PPP_ALLSTATIONS; /* broadcast address */ 782 h->control = PPP_UI; /* Unnumbered Info */ 783 } 784 } 785 786 switch (dst->sa_family) { 787 #ifdef INET 788 case AF_INET: /* Internet Protocol */ 789 if (sp->pp_flags & PP_CISCO) 790 protocol = htons(ETHERTYPE_IP); 791 else { 792 /* 793 * Don't choke with an ENETDOWN early. It's 794 * possible that we just started dialing out, 795 * so don't drop the packet immediately. If 796 * we notice that we run out of buffer space 797 * below, we will however remember that we are 798 * not ready to carry IP packets, and return 799 * ENETDOWN, as opposed to ENOBUFS. 800 */ 801 protocol = htons(PPP_IP); 802 if (sp->state[IDX_IPCP] != STATE_OPENED) 803 error = ENETDOWN; 804 } 805 break; 806 #endif 807 #ifdef INET6 808 case AF_INET6: /* Internet Protocol version 6 */ 809 if (sp->pp_flags & PP_CISCO) 810 protocol = htons(ETHERTYPE_IPV6); 811 else { 812 /* 813 * Don't choke with an ENETDOWN early. It's 814 * possible that we just started dialing out, 815 * so don't drop the packet immediately. If 816 * we notice that we run out of buffer space 817 * below, we will however remember that we are 818 * not ready to carry IP packets, and return 819 * ENETDOWN, as opposed to ENOBUFS. 820 */ 821 protocol = htons(PPP_IPV6); 822 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 823 error = ENETDOWN; 824 } 825 break; 826 #endif 827 #ifdef IPX 828 case AF_IPX: /* Novell IPX Protocol */ 829 protocol = htons((sp->pp_flags & PP_CISCO) ? 830 ETHERTYPE_IPX : PPP_IPX); 831 break; 832 #endif 833 default: 834 m_freem(m); 835 ++ifp->if_oerrors; 836 splx(s); 837 return (EAFNOSUPPORT); 838 } 839 840 if (sp->pp_flags & PP_NOFRAMING) { 841 M_PREPEND(m, 2, M_DONTWAIT); 842 if (m == NULL) { 843 if (ifp->if_flags & IFF_DEBUG) 844 log(LOG_DEBUG, "%s: no memory for transmit header\n", 845 ifp->if_xname); 846 ++ifp->if_oerrors; 847 splx(s); 848 return (ENOBUFS); 849 } 850 *mtod(m, uint16_t *) = protocol; 851 } else { 852 h->protocol = protocol; 853 } 854 855 856 error = ifq_enqueue2(ifp, ifq, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 857 858 if (error == 0) { 859 /* 860 * Count output packets and bytes. 861 * The packet length includes header + additional hardware 862 * framing according to RFC 1333. 863 */ 864 if (!(ifp->if_flags & IFF_OACTIVE)) 865 (*ifp->if_start)(ifp); 866 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 867 } 868 splx(s); 869 return error; 870 } 871 872 void 873 sppp_attach(struct ifnet *ifp) 874 { 875 struct sppp *sp = (struct sppp *) ifp; 876 877 /* Initialize keepalive handler. */ 878 if (! spppq) { 879 callout_init(&keepalive_ch, 0); 880 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 881 } 882 883 /* Insert new entry into the keepalive list. */ 884 sp->pp_next = spppq; 885 spppq = sp; 886 887 sp->pp_if.if_type = IFT_PPP; 888 sp->pp_if.if_output = sppp_output; 889 sp->pp_fastq.ifq_maxlen = 32; 890 sp->pp_cpq.ifq_maxlen = 20; 891 sp->pp_loopcnt = 0; 892 sp->pp_alivecnt = 0; 893 sp->pp_last_activity = 0; 894 sp->pp_last_receive = 0; 895 sp->pp_maxalive = DEFAULT_MAXALIVECNT; 896 sp->pp_max_noreceive = DEFAULT_NORECV_TIME; 897 sp->pp_idle_timeout = 0; 898 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 899 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 900 sp->pp_auth_failures = 0; 901 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 902 sp->pp_phase = SPPP_PHASE_DEAD; 903 sp->pp_up = lcp.Up; 904 sp->pp_down = lcp.Down; 905 906 if_alloc_sadl(ifp); 907 908 memset(&sp->myauth, 0, sizeof sp->myauth); 909 memset(&sp->hisauth, 0, sizeof sp->hisauth); 910 sppp_lcp_init(sp); 911 sppp_ipcp_init(sp); 912 sppp_ipv6cp_init(sp); 913 sppp_pap_init(sp); 914 sppp_chap_init(sp); 915 } 916 917 void 918 sppp_detach(struct ifnet *ifp) 919 { 920 struct sppp **q, *p, *sp = (struct sppp *) ifp; 921 922 /* Remove the entry from the keepalive list. */ 923 for (q = &spppq; (p = *q); q = &p->pp_next) 924 if (p == sp) { 925 *q = p->pp_next; 926 break; 927 } 928 929 /* Stop keepalive handler. */ 930 if (! spppq) { 931 callout_stop(&keepalive_ch); 932 } 933 934 callout_stop(&sp->ch[IDX_LCP]); 935 callout_stop(&sp->ch[IDX_IPCP]); 936 callout_stop(&sp->ch[IDX_PAP]); 937 callout_stop(&sp->ch[IDX_CHAP]); 938 #ifdef INET6 939 callout_stop(&sp->ch[IDX_IPV6CP]); 940 #endif 941 callout_stop(&sp->pap_my_to_ch); 942 943 /* free authentication info */ 944 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 945 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 946 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 947 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 948 949 #if 0 /* done in if_detach() */ 950 if_free_sadl(ifp); 951 #endif 952 } 953 954 /* 955 * Flush the interface output queue. 956 */ 957 void 958 sppp_flush(struct ifnet *ifp) 959 { 960 struct sppp *sp = (struct sppp *) ifp; 961 962 IFQ_PURGE(&sp->pp_if.if_snd); 963 IF_PURGE(&sp->pp_fastq); 964 IF_PURGE(&sp->pp_cpq); 965 } 966 967 /* 968 * Check if the output queue is empty. 969 */ 970 int 971 sppp_isempty(struct ifnet *ifp) 972 { 973 struct sppp *sp = (struct sppp *) ifp; 974 int empty, s; 975 976 s = splnet(); 977 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 978 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 979 splx(s); 980 return (empty); 981 } 982 983 /* 984 * Get next packet to send. 985 */ 986 struct mbuf * 987 sppp_dequeue(struct ifnet *ifp) 988 { 989 struct sppp *sp = (struct sppp *) ifp; 990 struct mbuf *m; 991 int s; 992 993 s = splnet(); 994 /* 995 * Process only the control protocol queue until we have at 996 * least one NCP open. 997 * 998 * Do always serve all three queues in Cisco mode. 999 */ 1000 IF_DEQUEUE(&sp->pp_cpq, m); 1001 if (m == NULL && 1002 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1003 IF_DEQUEUE(&sp->pp_fastq, m); 1004 if (m == NULL) 1005 IFQ_DEQUEUE(&sp->pp_if.if_snd, m); 1006 } 1007 splx(s); 1008 return m; 1009 } 1010 1011 /* 1012 * Process an ioctl request. Called on low priority level. 1013 */ 1014 int 1015 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1016 { 1017 struct lwp *l = curlwp; /* XXX */ 1018 struct ifreq *ifr = (struct ifreq *) data; 1019 struct sppp *sp = (struct sppp *) ifp; 1020 int s, error=0, going_up, going_down, newmode; 1021 1022 s = splnet(); 1023 switch (cmd) { 1024 case SIOCINITIFADDR: 1025 break; 1026 1027 case SIOCSIFFLAGS: 1028 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1029 break; 1030 going_up = ifp->if_flags & IFF_UP && 1031 (ifp->if_flags & IFF_RUNNING) == 0; 1032 going_down = (ifp->if_flags & IFF_UP) == 0 && 1033 ifp->if_flags & IFF_RUNNING; 1034 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1035 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1036 /* sanity */ 1037 newmode = IFF_PASSIVE; 1038 ifp->if_flags &= ~IFF_AUTO; 1039 } 1040 1041 if (going_up || going_down) 1042 lcp.Close(sp); 1043 if (going_up && newmode == 0) { 1044 /* neither auto-dial nor passive */ 1045 ifp->if_flags |= IFF_RUNNING; 1046 if (!(sp->pp_flags & PP_CISCO)) 1047 lcp.Open(sp); 1048 } else if (going_down) { 1049 sppp_flush(ifp); 1050 ifp->if_flags &= ~IFF_RUNNING; 1051 } 1052 1053 break; 1054 1055 case SIOCSIFMTU: 1056 if (ifr->ifr_mtu < PPP_MINMRU || 1057 ifr->ifr_mtu > sp->lcp.their_mru) { 1058 error = EINVAL; 1059 break; 1060 } 1061 /*FALLTHROUGH*/ 1062 case SIOCGIFMTU: 1063 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1064 error = 0; 1065 break; 1066 case SIOCADDMULTI: 1067 case SIOCDELMULTI: 1068 break; 1069 1070 case SPPPSETAUTHCFG: 1071 case SPPPSETLCPCFG: 1072 case SPPPSETIDLETO: 1073 case SPPPSETAUTHFAILURE: 1074 case SPPPSETDNSOPTS: 1075 case SPPPSETKEEPALIVE: 1076 #if defined(COMPAT_50) || defined(MODULAR) 1077 case __SPPPSETIDLETO50: 1078 case __SPPPSETKEEPALIVE50: 1079 #endif /* COMPAT_50 || MODULAR */ 1080 error = kauth_authorize_network(l->l_cred, 1081 KAUTH_NETWORK_INTERFACE, 1082 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1083 NULL); 1084 if (error) 1085 break; 1086 error = sppp_params(sp, cmd, data); 1087 break; 1088 1089 case SPPPGETAUTHCFG: 1090 case SPPPGETLCPCFG: 1091 case SPPPGETAUTHFAILURES: 1092 error = kauth_authorize_network(l->l_cred, 1093 KAUTH_NETWORK_INTERFACE, 1094 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, ifp, (void *)cmd, 1095 NULL); 1096 if (error) 1097 break; 1098 error = sppp_params(sp, cmd, data); 1099 break; 1100 1101 case SPPPGETSTATUS: 1102 case SPPPGETSTATUSNCP: 1103 case SPPPGETIDLETO: 1104 case SPPPGETDNSOPTS: 1105 case SPPPGETDNSADDRS: 1106 case SPPPGETKEEPALIVE: 1107 #if defined(COMPAT_50) || defined(MODULAR) 1108 case __SPPPGETIDLETO50: 1109 case __SPPPGETKEEPALIVE50: 1110 #endif /* COMPAT_50 || MODULAR */ 1111 error = sppp_params(sp, cmd, data); 1112 break; 1113 1114 default: 1115 error = ifioctl_common(ifp, cmd, data); 1116 break; 1117 } 1118 splx(s); 1119 return (error); 1120 } 1121 1122 1123 /* 1124 * Cisco framing implementation. 1125 */ 1126 1127 /* 1128 * Handle incoming Cisco keepalive protocol packets. 1129 */ 1130 static void 1131 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1132 { 1133 STDDCL; 1134 struct cisco_packet *h; 1135 #ifdef INET 1136 uint32_t me, mymask = 0; /* XXX: GCC */ 1137 #endif 1138 1139 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1140 if (debug) 1141 log(LOG_DEBUG, 1142 "%s: cisco invalid packet length: %d bytes\n", 1143 ifp->if_xname, m->m_pkthdr.len); 1144 return; 1145 } 1146 h = mtod(m, struct cisco_packet *); 1147 if (debug) 1148 log(LOG_DEBUG, 1149 "%s: cisco input: %d bytes " 1150 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1151 ifp->if_xname, m->m_pkthdr.len, 1152 ntohl(h->type), h->par1, h->par2, (u_int)h->rel, 1153 (u_int)h->time0, (u_int)h->time1); 1154 switch (ntohl(h->type)) { 1155 default: 1156 if (debug) 1157 addlog("%s: cisco unknown packet type: 0x%x\n", 1158 ifp->if_xname, ntohl(h->type)); 1159 break; 1160 case CISCO_ADDR_REPLY: 1161 /* Reply on address request, ignore */ 1162 break; 1163 case CISCO_KEEPALIVE_REQ: 1164 sp->pp_alivecnt = 0; 1165 sp->pp_rseq[IDX_LCP] = ntohl(h->par1); 1166 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1167 /* Local and remote sequence numbers are equal. 1168 * Probably, the line is in loopback mode. */ 1169 if (sp->pp_loopcnt >= LOOPALIVECNT) { 1170 printf ("%s: loopback\n", 1171 ifp->if_xname); 1172 sp->pp_loopcnt = 0; 1173 if (ifp->if_flags & IFF_UP) { 1174 if_down(ifp); 1175 IF_PURGE(&sp->pp_cpq); 1176 } 1177 } 1178 ++sp->pp_loopcnt; 1179 1180 /* Generate new local sequence number */ 1181 sp->pp_seq[IDX_LCP] = cprng_fast32(); 1182 break; 1183 } 1184 sp->pp_loopcnt = 0; 1185 if (! (ifp->if_flags & IFF_UP) && 1186 (ifp->if_flags & IFF_RUNNING)) { 1187 if_up(ifp); 1188 } 1189 break; 1190 case CISCO_ADDR_REQ: 1191 #ifdef INET 1192 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1193 if (me != 0L) 1194 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1195 #endif 1196 break; 1197 } 1198 } 1199 1200 /* 1201 * Send Cisco keepalive packet. 1202 */ 1203 static void 1204 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1205 { 1206 STDDCL; 1207 struct ppp_header *h; 1208 struct cisco_packet *ch; 1209 struct mbuf *m; 1210 uint32_t t; 1211 1212 t = time_uptime * 1000; 1213 MGETHDR(m, M_DONTWAIT, MT_DATA); 1214 if (! m) 1215 return; 1216 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1217 m->m_pkthdr.rcvif = 0; 1218 1219 h = mtod(m, struct ppp_header *); 1220 h->address = CISCO_MULTICAST; 1221 h->control = 0; 1222 h->protocol = htons(CISCO_KEEPALIVE); 1223 1224 ch = (struct cisco_packet *)(h + 1); 1225 ch->type = htonl(type); 1226 ch->par1 = htonl(par1); 1227 ch->par2 = htonl(par2); 1228 ch->rel = -1; 1229 1230 ch->time0 = htons((u_short)(t >> 16)); 1231 ch->time1 = htons((u_short) t); 1232 1233 if (debug) 1234 log(LOG_DEBUG, 1235 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1236 ifp->if_xname, ntohl(ch->type), ch->par1, 1237 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1238 (u_int)ch->time1); 1239 1240 if (IF_QFULL(&sp->pp_cpq)) { 1241 IF_DROP(&sp->pp_fastq); 1242 IF_DROP(&ifp->if_snd); 1243 m_freem(m); 1244 ++ifp->if_oerrors; 1245 return; 1246 } else 1247 IF_ENQUEUE(&sp->pp_cpq, m); 1248 if (! (ifp->if_flags & IFF_OACTIVE)) 1249 (*ifp->if_start)(ifp); 1250 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1251 } 1252 1253 /* 1254 * PPP protocol implementation. 1255 */ 1256 1257 /* 1258 * Send PPP control protocol packet. 1259 */ 1260 static void 1261 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1262 u_char ident, u_short len, void *data) 1263 { 1264 STDDCL; 1265 struct lcp_header *lh; 1266 struct mbuf *m; 1267 size_t pkthdrlen; 1268 1269 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1270 1271 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1272 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1273 MGETHDR(m, M_DONTWAIT, MT_DATA); 1274 if (! m) 1275 return; 1276 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1277 m->m_pkthdr.rcvif = 0; 1278 1279 if (sp->pp_flags & PP_NOFRAMING) { 1280 *mtod(m, uint16_t *) = htons(proto); 1281 lh = (struct lcp_header *)(mtod(m, uint8_t *) + 2); 1282 } else { 1283 struct ppp_header *h; 1284 h = mtod(m, struct ppp_header *); 1285 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1286 h->control = PPP_UI; /* Unnumbered Info */ 1287 h->protocol = htons(proto); /* Link Control Protocol */ 1288 lh = (struct lcp_header *)(h + 1); 1289 } 1290 lh->type = type; 1291 lh->ident = ident; 1292 lh->len = htons(LCP_HEADER_LEN + len); 1293 if (len) 1294 bcopy (data, lh + 1, len); 1295 1296 if (debug) { 1297 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1298 ifp->if_xname, 1299 sppp_proto_name(proto), 1300 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1301 if (len) 1302 sppp_print_bytes((u_char *)(lh + 1), len); 1303 addlog(">\n"); 1304 } 1305 if (IF_QFULL(&sp->pp_cpq)) { 1306 IF_DROP(&sp->pp_fastq); 1307 IF_DROP(&ifp->if_snd); 1308 m_freem(m); 1309 ++ifp->if_oerrors; 1310 return; 1311 } else 1312 IF_ENQUEUE(&sp->pp_cpq, m); 1313 if (! (ifp->if_flags & IFF_OACTIVE)) 1314 (*ifp->if_start)(ifp); 1315 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1316 } 1317 1318 /* 1319 * Handle incoming PPP control protocol packets. 1320 */ 1321 static void 1322 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1323 { 1324 STDDCL; 1325 struct lcp_header *h; 1326 int printlen, len = m->m_pkthdr.len; 1327 int rv; 1328 u_char *p; 1329 uint32_t u32; 1330 1331 if (len < 4) { 1332 if (debug) 1333 log(LOG_DEBUG, 1334 "%s: %s invalid packet length: %d bytes\n", 1335 ifp->if_xname, cp->name, len); 1336 return; 1337 } 1338 h = mtod(m, struct lcp_header *); 1339 if (debug) { 1340 printlen = ntohs(h->len); 1341 log(LOG_DEBUG, 1342 "%s: %s input(%s): <%s id=0x%x len=%d", 1343 ifp->if_xname, cp->name, 1344 sppp_state_name(sp->state[cp->protoidx]), 1345 sppp_cp_type_name(h->type), h->ident, printlen); 1346 if (len < printlen) 1347 printlen = len; 1348 if (printlen > 4) 1349 sppp_print_bytes((u_char *)(h + 1), printlen - 4); 1350 addlog(">\n"); 1351 } 1352 if (len > ntohs(h->len)) 1353 len = ntohs(h->len); 1354 p = (u_char *)(h + 1); 1355 switch (h->type) { 1356 case CONF_REQ: 1357 if (len < 4) { 1358 if (debug) 1359 addlog("%s: %s invalid conf-req length %d\n", 1360 ifp->if_xname, cp->name, 1361 len); 1362 ++ifp->if_ierrors; 1363 break; 1364 } 1365 /* handle states where RCR doesn't get a SCA/SCN */ 1366 switch (sp->state[cp->protoidx]) { 1367 case STATE_CLOSING: 1368 case STATE_STOPPING: 1369 return; 1370 case STATE_CLOSED: 1371 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1372 0, 0); 1373 return; 1374 } 1375 rv = (cp->RCR)(sp, h, len); 1376 if (rv < 0) { 1377 /* fatal error, shut down */ 1378 (cp->tld)(sp); 1379 sppp_lcp_tlf(sp); 1380 return; 1381 } 1382 switch (sp->state[cp->protoidx]) { 1383 case STATE_OPENED: 1384 (cp->tld)(sp); 1385 (cp->scr)(sp); 1386 /* fall through... */ 1387 case STATE_ACK_SENT: 1388 case STATE_REQ_SENT: 1389 sppp_cp_change_state(cp, sp, rv? 1390 STATE_ACK_SENT: STATE_REQ_SENT); 1391 break; 1392 case STATE_STOPPED: 1393 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1394 (cp->scr)(sp); 1395 sppp_cp_change_state(cp, sp, rv? 1396 STATE_ACK_SENT: STATE_REQ_SENT); 1397 break; 1398 case STATE_ACK_RCVD: 1399 if (rv) { 1400 sppp_cp_change_state(cp, sp, STATE_OPENED); 1401 if (debug) 1402 log(LOG_DEBUG, "%s: %s tlu\n", 1403 ifp->if_xname, 1404 cp->name); 1405 (cp->tlu)(sp); 1406 } else 1407 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1408 break; 1409 default: 1410 printf("%s: %s illegal %s in state %s\n", 1411 ifp->if_xname, cp->name, 1412 sppp_cp_type_name(h->type), 1413 sppp_state_name(sp->state[cp->protoidx])); 1414 ++ifp->if_ierrors; 1415 } 1416 break; 1417 case CONF_ACK: 1418 if (h->ident != sp->confid[cp->protoidx]) { 1419 if (debug) 1420 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1421 ifp->if_xname, cp->name, 1422 h->ident, sp->confid[cp->protoidx]); 1423 ++ifp->if_ierrors; 1424 break; 1425 } 1426 switch (sp->state[cp->protoidx]) { 1427 case STATE_CLOSED: 1428 case STATE_STOPPED: 1429 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1430 break; 1431 case STATE_CLOSING: 1432 case STATE_STOPPING: 1433 break; 1434 case STATE_REQ_SENT: 1435 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1436 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1437 break; 1438 case STATE_OPENED: 1439 (cp->tld)(sp); 1440 /* fall through */ 1441 case STATE_ACK_RCVD: 1442 (cp->scr)(sp); 1443 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1444 break; 1445 case STATE_ACK_SENT: 1446 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1447 sppp_cp_change_state(cp, sp, STATE_OPENED); 1448 if (debug) 1449 log(LOG_DEBUG, "%s: %s tlu\n", 1450 ifp->if_xname, cp->name); 1451 (cp->tlu)(sp); 1452 break; 1453 default: 1454 printf("%s: %s illegal %s in state %s\n", 1455 ifp->if_xname, cp->name, 1456 sppp_cp_type_name(h->type), 1457 sppp_state_name(sp->state[cp->protoidx])); 1458 ++ifp->if_ierrors; 1459 } 1460 break; 1461 case CONF_NAK: 1462 case CONF_REJ: 1463 if (h->ident != sp->confid[cp->protoidx]) { 1464 if (debug) 1465 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1466 ifp->if_xname, cp->name, 1467 h->ident, sp->confid[cp->protoidx]); 1468 ++ifp->if_ierrors; 1469 break; 1470 } 1471 if (h->type == CONF_NAK) 1472 (cp->RCN_nak)(sp, h, len); 1473 else /* CONF_REJ */ 1474 (cp->RCN_rej)(sp, h, len); 1475 1476 switch (sp->state[cp->protoidx]) { 1477 case STATE_CLOSED: 1478 case STATE_STOPPED: 1479 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1480 break; 1481 case STATE_REQ_SENT: 1482 case STATE_ACK_SENT: 1483 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1484 (cp->scr)(sp); 1485 break; 1486 case STATE_OPENED: 1487 (cp->tld)(sp); 1488 /* fall through */ 1489 case STATE_ACK_RCVD: 1490 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1491 (cp->scr)(sp); 1492 break; 1493 case STATE_CLOSING: 1494 case STATE_STOPPING: 1495 break; 1496 default: 1497 printf("%s: %s illegal %s in state %s\n", 1498 ifp->if_xname, cp->name, 1499 sppp_cp_type_name(h->type), 1500 sppp_state_name(sp->state[cp->protoidx])); 1501 ++ifp->if_ierrors; 1502 } 1503 break; 1504 1505 case TERM_REQ: 1506 switch (sp->state[cp->protoidx]) { 1507 case STATE_ACK_RCVD: 1508 case STATE_ACK_SENT: 1509 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1510 /* fall through */ 1511 case STATE_CLOSED: 1512 case STATE_STOPPED: 1513 case STATE_CLOSING: 1514 case STATE_STOPPING: 1515 case STATE_REQ_SENT: 1516 sta: 1517 /* Send Terminate-Ack packet. */ 1518 if (debug) 1519 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1520 ifp->if_xname, cp->name); 1521 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1522 break; 1523 case STATE_OPENED: 1524 (cp->tld)(sp); 1525 sp->rst_counter[cp->protoidx] = 0; 1526 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1527 goto sta; 1528 default: 1529 printf("%s: %s illegal %s in state %s\n", 1530 ifp->if_xname, cp->name, 1531 sppp_cp_type_name(h->type), 1532 sppp_state_name(sp->state[cp->protoidx])); 1533 ++ifp->if_ierrors; 1534 } 1535 break; 1536 case TERM_ACK: 1537 switch (sp->state[cp->protoidx]) { 1538 case STATE_CLOSED: 1539 case STATE_STOPPED: 1540 case STATE_REQ_SENT: 1541 case STATE_ACK_SENT: 1542 break; 1543 case STATE_CLOSING: 1544 (cp->tlf)(sp); 1545 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1546 sppp_lcp_check_and_close(sp); 1547 break; 1548 case STATE_STOPPING: 1549 (cp->tlf)(sp); 1550 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1551 sppp_lcp_check_and_close(sp); 1552 break; 1553 case STATE_ACK_RCVD: 1554 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1555 break; 1556 case STATE_OPENED: 1557 (cp->tld)(sp); 1558 (cp->scr)(sp); 1559 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1560 break; 1561 default: 1562 printf("%s: %s illegal %s in state %s\n", 1563 ifp->if_xname, cp->name, 1564 sppp_cp_type_name(h->type), 1565 sppp_state_name(sp->state[cp->protoidx])); 1566 ++ifp->if_ierrors; 1567 } 1568 break; 1569 case CODE_REJ: 1570 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1571 log(LOG_INFO, 1572 "%s: %s: ignoring RXJ (%s) for code ?, " 1573 "danger will robinson\n", 1574 ifp->if_xname, cp->name, 1575 sppp_cp_type_name(h->type)); 1576 switch (sp->state[cp->protoidx]) { 1577 case STATE_CLOSED: 1578 case STATE_STOPPED: 1579 case STATE_REQ_SENT: 1580 case STATE_ACK_SENT: 1581 case STATE_CLOSING: 1582 case STATE_STOPPING: 1583 case STATE_OPENED: 1584 break; 1585 case STATE_ACK_RCVD: 1586 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1587 break; 1588 default: 1589 printf("%s: %s illegal %s in state %s\n", 1590 ifp->if_xname, cp->name, 1591 sppp_cp_type_name(h->type), 1592 sppp_state_name(sp->state[cp->protoidx])); 1593 ++ifp->if_ierrors; 1594 } 1595 break; 1596 case PROTO_REJ: 1597 { 1598 int catastrophic; 1599 const struct cp *upper; 1600 int i; 1601 uint16_t proto; 1602 1603 catastrophic = 0; 1604 upper = NULL; 1605 proto = p[0] << 8 | p[1]; 1606 for (i = 0; i < IDX_COUNT; i++) { 1607 if (cps[i]->proto == proto) { 1608 upper = cps[i]; 1609 break; 1610 } 1611 } 1612 if (upper == NULL) 1613 catastrophic++; 1614 1615 if (debug) 1616 log(LOG_INFO, 1617 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1618 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1619 sppp_cp_type_name(h->type), proto, 1620 upper ? upper->name : "unknown", 1621 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1622 1623 /* 1624 * if we got RXJ+ against conf-req, the peer does not implement 1625 * this particular protocol type. terminate the protocol. 1626 */ 1627 if (upper && !catastrophic) { 1628 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1629 upper->Close(sp); 1630 break; 1631 } 1632 } 1633 1634 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1635 switch (sp->state[cp->protoidx]) { 1636 case STATE_CLOSED: 1637 case STATE_STOPPED: 1638 case STATE_REQ_SENT: 1639 case STATE_ACK_SENT: 1640 case STATE_CLOSING: 1641 case STATE_STOPPING: 1642 case STATE_OPENED: 1643 break; 1644 case STATE_ACK_RCVD: 1645 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1646 break; 1647 default: 1648 printf("%s: %s illegal %s in state %s\n", 1649 ifp->if_xname, cp->name, 1650 sppp_cp_type_name(h->type), 1651 sppp_state_name(sp->state[cp->protoidx])); 1652 ++ifp->if_ierrors; 1653 } 1654 break; 1655 } 1656 case DISC_REQ: 1657 if (cp->proto != PPP_LCP) 1658 goto illegal; 1659 /* Discard the packet. */ 1660 break; 1661 case ECHO_REQ: 1662 if (cp->proto != PPP_LCP) 1663 goto illegal; 1664 if (sp->state[cp->protoidx] != STATE_OPENED) { 1665 if (debug) 1666 addlog("%s: lcp echo req but lcp closed\n", 1667 ifp->if_xname); 1668 ++ifp->if_ierrors; 1669 break; 1670 } 1671 if (len < 8) { 1672 if (debug) 1673 addlog("%s: invalid lcp echo request " 1674 "packet length: %d bytes\n", 1675 ifp->if_xname, len); 1676 break; 1677 } 1678 memcpy(&u32, h + 1, sizeof u32); 1679 if (ntohl(u32) == sp->lcp.magic) { 1680 /* Line loopback mode detected. */ 1681 printf("%s: loopback\n", ifp->if_xname); 1682 if_down(ifp); 1683 IF_PURGE(&sp->pp_cpq); 1684 1685 /* Shut down the PPP link. */ 1686 /* XXX */ 1687 lcp.Down(sp); 1688 lcp.Up(sp); 1689 break; 1690 } 1691 u32 = htonl(sp->lcp.magic); 1692 memcpy(h + 1, &u32, sizeof u32); 1693 if (debug) 1694 addlog("%s: got lcp echo req, sending echo rep\n", 1695 ifp->if_xname); 1696 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1697 h + 1); 1698 break; 1699 case ECHO_REPLY: 1700 if (cp->proto != PPP_LCP) 1701 goto illegal; 1702 if (h->ident != sp->lcp.echoid) { 1703 ++ifp->if_ierrors; 1704 break; 1705 } 1706 if (len < 8) { 1707 if (debug) 1708 addlog("%s: lcp invalid echo reply " 1709 "packet length: %d bytes\n", 1710 ifp->if_xname, len); 1711 break; 1712 } 1713 if (debug) 1714 addlog("%s: lcp got echo rep\n", 1715 ifp->if_xname); 1716 memcpy(&u32, h + 1, sizeof u32); 1717 if (ntohl(u32) != sp->lcp.magic) 1718 sp->pp_alivecnt = 0; 1719 break; 1720 default: 1721 /* Unknown packet type -- send Code-Reject packet. */ 1722 illegal: 1723 if (debug) 1724 addlog("%s: %s send code-rej for 0x%x\n", 1725 ifp->if_xname, cp->name, h->type); 1726 sppp_cp_send(sp, cp->proto, CODE_REJ, 1727 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1728 ++ifp->if_ierrors; 1729 } 1730 } 1731 1732 1733 /* 1734 * The generic part of all Up/Down/Open/Close/TO event handlers. 1735 * Basically, the state transition handling in the automaton. 1736 */ 1737 static void 1738 sppp_up_event(const struct cp *cp, struct sppp *sp) 1739 { 1740 STDDCL; 1741 1742 if (debug) 1743 log(LOG_DEBUG, "%s: %s up(%s)\n", 1744 ifp->if_xname, cp->name, 1745 sppp_state_name(sp->state[cp->protoidx])); 1746 1747 switch (sp->state[cp->protoidx]) { 1748 case STATE_INITIAL: 1749 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1750 break; 1751 case STATE_STARTING: 1752 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1753 (cp->scr)(sp); 1754 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1755 break; 1756 default: 1757 printf("%s: %s illegal up in state %s\n", 1758 ifp->if_xname, cp->name, 1759 sppp_state_name(sp->state[cp->protoidx])); 1760 } 1761 } 1762 1763 static void 1764 sppp_down_event(const struct cp *cp, struct sppp *sp) 1765 { 1766 STDDCL; 1767 1768 if (debug) 1769 log(LOG_DEBUG, "%s: %s down(%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_CLOSED: 1775 case STATE_CLOSING: 1776 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1777 break; 1778 case STATE_STOPPED: 1779 (cp->tls)(sp); 1780 /* fall through */ 1781 case STATE_STOPPING: 1782 case STATE_REQ_SENT: 1783 case STATE_ACK_RCVD: 1784 case STATE_ACK_SENT: 1785 sppp_cp_change_state(cp, sp, STATE_STARTING); 1786 break; 1787 case STATE_OPENED: 1788 (cp->tld)(sp); 1789 sppp_cp_change_state(cp, sp, STATE_STARTING); 1790 break; 1791 default: 1792 printf("%s: %s illegal down in state %s\n", 1793 ifp->if_xname, cp->name, 1794 sppp_state_name(sp->state[cp->protoidx])); 1795 } 1796 } 1797 1798 1799 static void 1800 sppp_open_event(const struct cp *cp, struct sppp *sp) 1801 { 1802 STDDCL; 1803 1804 if (debug) 1805 log(LOG_DEBUG, "%s: %s open(%s)\n", 1806 ifp->if_xname, cp->name, 1807 sppp_state_name(sp->state[cp->protoidx])); 1808 1809 switch (sp->state[cp->protoidx]) { 1810 case STATE_INITIAL: 1811 sppp_cp_change_state(cp, sp, STATE_STARTING); 1812 (cp->tls)(sp); 1813 break; 1814 case STATE_STARTING: 1815 break; 1816 case STATE_CLOSED: 1817 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1818 (cp->scr)(sp); 1819 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1820 break; 1821 case STATE_STOPPED: 1822 case STATE_STOPPING: 1823 case STATE_REQ_SENT: 1824 case STATE_ACK_RCVD: 1825 case STATE_ACK_SENT: 1826 case STATE_OPENED: 1827 break; 1828 case STATE_CLOSING: 1829 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1830 break; 1831 } 1832 } 1833 1834 1835 static void 1836 sppp_close_event(const struct cp *cp, struct sppp *sp) 1837 { 1838 STDDCL; 1839 1840 if (debug) 1841 log(LOG_DEBUG, "%s: %s close(%s)\n", 1842 ifp->if_xname, cp->name, 1843 sppp_state_name(sp->state[cp->protoidx])); 1844 1845 switch (sp->state[cp->protoidx]) { 1846 case STATE_INITIAL: 1847 case STATE_CLOSED: 1848 case STATE_CLOSING: 1849 break; 1850 case STATE_STARTING: 1851 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1852 (cp->tlf)(sp); 1853 break; 1854 case STATE_STOPPED: 1855 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1856 break; 1857 case STATE_STOPPING: 1858 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1859 break; 1860 case STATE_OPENED: 1861 (cp->tld)(sp); 1862 /* fall through */ 1863 case STATE_REQ_SENT: 1864 case STATE_ACK_RCVD: 1865 case STATE_ACK_SENT: 1866 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1867 sppp_cp_send(sp, cp->proto, TERM_REQ, 1868 ++sp->pp_seq[cp->protoidx], 0, 0); 1869 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1870 break; 1871 } 1872 } 1873 1874 static void 1875 sppp_to_event(const struct cp *cp, struct sppp *sp) 1876 { 1877 STDDCL; 1878 int s; 1879 1880 s = splnet(); 1881 if (debug) 1882 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1883 ifp->if_xname, cp->name, 1884 sppp_state_name(sp->state[cp->protoidx]), 1885 sp->rst_counter[cp->protoidx]); 1886 1887 if (--sp->rst_counter[cp->protoidx] < 0) 1888 /* TO- event */ 1889 switch (sp->state[cp->protoidx]) { 1890 case STATE_CLOSING: 1891 (cp->tlf)(sp); 1892 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1893 sppp_lcp_check_and_close(sp); 1894 break; 1895 case STATE_STOPPING: 1896 (cp->tlf)(sp); 1897 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1898 sppp_lcp_check_and_close(sp); 1899 break; 1900 case STATE_REQ_SENT: 1901 case STATE_ACK_RCVD: 1902 case STATE_ACK_SENT: 1903 (cp->tlf)(sp); 1904 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1905 sppp_lcp_check_and_close(sp); 1906 break; 1907 } 1908 else 1909 /* TO+ event */ 1910 switch (sp->state[cp->protoidx]) { 1911 case STATE_CLOSING: 1912 case STATE_STOPPING: 1913 sppp_cp_send(sp, cp->proto, TERM_REQ, 1914 ++sp->pp_seq[cp->protoidx], 0, 0); 1915 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1916 cp->TO, sp); 1917 break; 1918 case STATE_REQ_SENT: 1919 case STATE_ACK_RCVD: 1920 (cp->scr)(sp); 1921 /* sppp_cp_change_state() will restart the timer */ 1922 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1923 break; 1924 case STATE_ACK_SENT: 1925 (cp->scr)(sp); 1926 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1927 cp->TO, sp); 1928 break; 1929 } 1930 1931 splx(s); 1932 } 1933 1934 /* 1935 * Change the state of a control protocol in the state automaton. 1936 * Takes care of starting/stopping the restart timer. 1937 */ 1938 void 1939 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1940 { 1941 sp->state[cp->protoidx] = newstate; 1942 callout_stop(&sp->ch[cp->protoidx]); 1943 switch (newstate) { 1944 case STATE_INITIAL: 1945 case STATE_STARTING: 1946 case STATE_CLOSED: 1947 case STATE_STOPPED: 1948 case STATE_OPENED: 1949 break; 1950 case STATE_CLOSING: 1951 case STATE_STOPPING: 1952 case STATE_REQ_SENT: 1953 case STATE_ACK_RCVD: 1954 case STATE_ACK_SENT: 1955 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1956 cp->TO, sp); 1957 break; 1958 } 1959 } 1960 1961 /* 1962 *--------------------------------------------------------------------------* 1963 * * 1964 * The LCP implementation. * 1965 * * 1966 *--------------------------------------------------------------------------* 1967 */ 1968 static void 1969 sppp_lcp_init(struct sppp *sp) 1970 { 1971 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1972 sp->lcp.magic = 0; 1973 sp->state[IDX_LCP] = STATE_INITIAL; 1974 sp->fail_counter[IDX_LCP] = 0; 1975 sp->pp_seq[IDX_LCP] = 0; 1976 sp->pp_rseq[IDX_LCP] = 0; 1977 sp->lcp.protos = 0; 1978 1979 /* 1980 * Initialize counters and timeout values. Note that we don't 1981 * use the 3 seconds suggested in RFC 1661 since we are likely 1982 * running on a fast link. XXX We should probably implement 1983 * the exponential backoff option. Note that these values are 1984 * relevant for all control protocols, not just LCP only. 1985 */ 1986 sp->lcp.timeout = 1 * hz; 1987 sp->lcp.max_terminate = 2; 1988 sp->lcp.max_configure = 10; 1989 sp->lcp.max_failure = 10; 1990 callout_init(&sp->ch[IDX_LCP], 0); 1991 } 1992 1993 static void 1994 sppp_lcp_up(struct sppp *sp) 1995 { 1996 STDDCL; 1997 1998 /* Initialize activity timestamp: opening a connection is an activity */ 1999 sp->pp_last_receive = sp->pp_last_activity = time_uptime; 2000 2001 /* 2002 * If this interface is passive or dial-on-demand, and we are 2003 * still in Initial state, it means we've got an incoming 2004 * call. Activate the interface. 2005 */ 2006 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2007 if (debug) 2008 log(LOG_DEBUG, 2009 "%s: Up event", ifp->if_xname); 2010 ifp->if_flags |= IFF_RUNNING; 2011 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2012 if (debug) 2013 addlog("(incoming call)\n"); 2014 sp->pp_flags |= PP_CALLIN; 2015 lcp.Open(sp); 2016 } else if (debug) 2017 addlog("\n"); 2018 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2019 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2020 ifp->if_flags |= IFF_RUNNING; 2021 lcp.Open(sp); 2022 } 2023 2024 sppp_up_event(&lcp, sp); 2025 } 2026 2027 static void 2028 sppp_lcp_down(struct sppp *sp) 2029 { 2030 STDDCL; 2031 2032 sppp_down_event(&lcp, sp); 2033 2034 /* 2035 * If this is neither a dial-on-demand nor a passive 2036 * interface, simulate an ``ifconfig down'' action, so the 2037 * administrator can force a redial by another ``ifconfig 2038 * up''. XXX For leased line operation, should we immediately 2039 * try to reopen the connection here? 2040 */ 2041 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2042 if (debug) 2043 log(LOG_INFO, 2044 "%s: Down event (carrier loss), taking interface down.\n", 2045 ifp->if_xname); 2046 if_down(ifp); 2047 } else { 2048 if (debug) 2049 log(LOG_DEBUG, 2050 "%s: Down event (carrier loss)\n", 2051 ifp->if_xname); 2052 } 2053 sp->pp_flags &= ~PP_CALLIN; 2054 if (sp->state[IDX_LCP] != STATE_INITIAL) 2055 lcp.Close(sp); 2056 ifp->if_flags &= ~IFF_RUNNING; 2057 } 2058 2059 static void 2060 sppp_lcp_open(struct sppp *sp) 2061 { 2062 if (sp->pp_if.if_mtu < PP_MTU) { 2063 sp->lcp.mru = sp->pp_if.if_mtu; 2064 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2065 } else 2066 sp->lcp.mru = PP_MTU; 2067 sp->lcp.their_mru = PP_MTU; 2068 2069 /* 2070 * If we are authenticator, negotiate LCP_AUTH 2071 */ 2072 if (sp->hisauth.proto != 0) 2073 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2074 else 2075 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2076 sp->pp_flags &= ~PP_NEEDAUTH; 2077 sppp_open_event(&lcp, sp); 2078 } 2079 2080 static void 2081 sppp_lcp_close(struct sppp *sp) 2082 { 2083 sppp_close_event(&lcp, sp); 2084 } 2085 2086 static void 2087 sppp_lcp_TO(void *cookie) 2088 { 2089 sppp_to_event(&lcp, (struct sppp *)cookie); 2090 } 2091 2092 /* 2093 * Analyze a configure request. Return true if it was agreeable, and 2094 * caused action sca, false if it has been rejected or nak'ed, and 2095 * caused action scn. (The return value is used to make the state 2096 * transition decision in the state automaton.) 2097 */ 2098 static int 2099 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2100 { 2101 STDDCL; 2102 u_char *buf, *r, *p; 2103 int origlen, rlen; 2104 uint32_t nmagic; 2105 u_short authproto; 2106 2107 len -= 4; 2108 origlen = len; 2109 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2110 if (! buf) 2111 return (0); 2112 2113 if (debug) 2114 log(LOG_DEBUG, "%s: lcp parse opts:", 2115 ifp->if_xname); 2116 2117 /* pass 1: check for things that need to be rejected */ 2118 p = (void *)(h + 1); 2119 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2120 /* Sanity check option length */ 2121 if (p[1] > len) { 2122 /* 2123 * Malicious option - drop immediately. 2124 * XXX Maybe we should just RXJ it? 2125 */ 2126 addlog("%s: received malicious LCP option 0x%02x, " 2127 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2128 p[0], p[1], len); 2129 goto drop; 2130 } 2131 if (debug) 2132 addlog(" %s", sppp_lcp_opt_name(*p)); 2133 switch (*p) { 2134 case LCP_OPT_MAGIC: 2135 /* Magic number. */ 2136 /* fall through, both are same length */ 2137 case LCP_OPT_ASYNC_MAP: 2138 /* Async control character map. */ 2139 if (len >= 6 || p[1] == 6) 2140 continue; 2141 if (debug) 2142 addlog(" [invalid]"); 2143 break; 2144 case LCP_OPT_MRU: 2145 /* Maximum receive unit. */ 2146 if (len >= 4 && p[1] == 4) 2147 continue; 2148 if (debug) 2149 addlog(" [invalid]"); 2150 break; 2151 case LCP_OPT_AUTH_PROTO: 2152 if (len < 4) { 2153 if (debug) 2154 addlog(" [invalid]"); 2155 break; 2156 } 2157 authproto = (p[2] << 8) + p[3]; 2158 if (authproto == PPP_CHAP && p[1] != 5) { 2159 if (debug) 2160 addlog(" [invalid chap len]"); 2161 break; 2162 } 2163 if (sp->myauth.proto == 0) { 2164 /* we are not configured to do auth */ 2165 if (debug) 2166 addlog(" [not configured]"); 2167 break; 2168 } 2169 /* 2170 * Remote want us to authenticate, remember this, 2171 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2172 * up. 2173 */ 2174 sp->pp_flags |= PP_NEEDAUTH; 2175 continue; 2176 default: 2177 /* Others not supported. */ 2178 if (debug) 2179 addlog(" [rej]"); 2180 break; 2181 } 2182 /* Add the option to rejected list. */ 2183 bcopy (p, r, p[1]); 2184 r += p[1]; 2185 rlen += p[1]; 2186 } 2187 if (rlen) { 2188 if (debug) 2189 addlog(" send conf-rej\n"); 2190 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2191 goto end; 2192 } else if (debug) 2193 addlog("\n"); 2194 2195 /* 2196 * pass 2: check for option values that are unacceptable and 2197 * thus require to be nak'ed. 2198 */ 2199 if (debug) 2200 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2201 ifp->if_xname); 2202 2203 p = (void *)(h + 1); 2204 len = origlen; 2205 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2206 if (debug) 2207 addlog(" %s", sppp_lcp_opt_name(*p)); 2208 switch (*p) { 2209 case LCP_OPT_MAGIC: 2210 /* Magic number -- extract. */ 2211 nmagic = (uint32_t)p[2] << 24 | 2212 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2213 if (nmagic != sp->lcp.magic) { 2214 if (debug) 2215 addlog(" 0x%x", nmagic); 2216 continue; 2217 } 2218 /* 2219 * Local and remote magics equal -- loopback? 2220 */ 2221 if (sp->pp_loopcnt >= LOOPALIVECNT*5) { 2222 printf ("%s: loopback\n", 2223 ifp->if_xname); 2224 sp->pp_loopcnt = 0; 2225 if (ifp->if_flags & IFF_UP) { 2226 if_down(ifp); 2227 IF_PURGE(&sp->pp_cpq); 2228 /* XXX ? */ 2229 lcp.Down(sp); 2230 lcp.Up(sp); 2231 } 2232 } else if (debug) 2233 addlog(" [glitch]"); 2234 ++sp->pp_loopcnt; 2235 /* 2236 * We negate our magic here, and NAK it. If 2237 * we see it later in an NAK packet, we 2238 * suggest a new one. 2239 */ 2240 nmagic = ~sp->lcp.magic; 2241 /* Gonna NAK it. */ 2242 p[2] = nmagic >> 24; 2243 p[3] = nmagic >> 16; 2244 p[4] = nmagic >> 8; 2245 p[5] = nmagic; 2246 break; 2247 2248 case LCP_OPT_ASYNC_MAP: 2249 /* 2250 * Async control character map -- just ignore it. 2251 * 2252 * Quote from RFC 1662, chapter 6: 2253 * To enable this functionality, synchronous PPP 2254 * implementations MUST always respond to the 2255 * Async-Control-Character-Map Configuration 2256 * Option with the LCP Configure-Ack. However, 2257 * acceptance of the Configuration Option does 2258 * not imply that the synchronous implementation 2259 * will do any ACCM mapping. Instead, all such 2260 * octet mapping will be performed by the 2261 * asynchronous-to-synchronous converter. 2262 */ 2263 continue; 2264 2265 case LCP_OPT_MRU: 2266 /* 2267 * Maximum receive unit. Always agreeable, 2268 * but ignored by now. 2269 */ 2270 sp->lcp.their_mru = p[2] * 256 + p[3]; 2271 if (debug) 2272 addlog(" %ld", sp->lcp.their_mru); 2273 continue; 2274 2275 case LCP_OPT_AUTH_PROTO: 2276 authproto = (p[2] << 8) + p[3]; 2277 if (sp->myauth.proto != authproto) { 2278 /* not agreed, nak */ 2279 if (debug) 2280 addlog(" [mine %s != his %s]", 2281 sppp_proto_name(sp->myauth.proto), 2282 sppp_proto_name(authproto)); 2283 p[2] = sp->myauth.proto >> 8; 2284 p[3] = sp->myauth.proto; 2285 break; 2286 } 2287 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2288 if (debug) 2289 addlog(" [chap not MD5]"); 2290 p[4] = CHAP_MD5; 2291 break; 2292 } 2293 continue; 2294 } 2295 /* Add the option to nak'ed list. */ 2296 bcopy (p, r, p[1]); 2297 r += p[1]; 2298 rlen += p[1]; 2299 } 2300 if (rlen) { 2301 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2302 if (debug) 2303 addlog(" max_failure (%d) exceeded, " 2304 "send conf-rej\n", 2305 sp->lcp.max_failure); 2306 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2307 } else { 2308 if (debug) 2309 addlog(" send conf-nak\n"); 2310 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2311 } 2312 goto end; 2313 } else { 2314 if (debug) 2315 addlog(" send conf-ack\n"); 2316 sp->fail_counter[IDX_LCP] = 0; 2317 sp->pp_loopcnt = 0; 2318 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2319 } 2320 2321 end: 2322 free(buf, M_TEMP); 2323 return (rlen == 0); 2324 2325 drop: 2326 free(buf, M_TEMP); 2327 return -1; 2328 } 2329 2330 /* 2331 * Analyze the LCP Configure-Reject option list, and adjust our 2332 * negotiation. 2333 */ 2334 static void 2335 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2336 { 2337 STDDCL; 2338 u_char *buf, *p; 2339 2340 len -= 4; 2341 buf = malloc (len, M_TEMP, M_NOWAIT); 2342 if (!buf) 2343 return; 2344 2345 if (debug) 2346 log(LOG_DEBUG, "%s: lcp rej opts:", 2347 ifp->if_xname); 2348 2349 p = (void *)(h + 1); 2350 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2351 /* Sanity check option length */ 2352 if (p[1] > len) { 2353 /* 2354 * Malicious option - drop immediately. 2355 * XXX Maybe we should just RXJ it? 2356 */ 2357 addlog("%s: received malicious LCP option, " 2358 "dropping.\n", ifp->if_xname); 2359 goto drop; 2360 } 2361 if (debug) 2362 addlog(" %s", sppp_lcp_opt_name(*p)); 2363 switch (*p) { 2364 case LCP_OPT_MAGIC: 2365 /* Magic number -- can't use it, use 0 */ 2366 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2367 sp->lcp.magic = 0; 2368 break; 2369 case LCP_OPT_MRU: 2370 /* 2371 * We try to negotiate a lower MRU if the underlying 2372 * link's MTU is less than PP_MTU (e.g. PPPoE). If the 2373 * peer rejects this lower rate, fallback to the 2374 * default. 2375 */ 2376 if (debug) { 2377 addlog("%s: warning: peer rejected our MRU of " 2378 "%ld bytes. Defaulting to %d bytes\n", 2379 ifp->if_xname, sp->lcp.mru, PP_MTU); 2380 } 2381 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2382 sp->lcp.mru = PP_MTU; 2383 break; 2384 case LCP_OPT_AUTH_PROTO: 2385 /* 2386 * Peer doesn't want to authenticate himself, 2387 * deny unless this is a dialout call, and 2388 * SPPP_AUTHFLAG_NOCALLOUT is set. 2389 */ 2390 if ((sp->pp_flags & PP_CALLIN) == 0 && 2391 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2392 if (debug) 2393 addlog(" [don't insist on auth " 2394 "for callout]"); 2395 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2396 break; 2397 } 2398 if (debug) 2399 addlog("[access denied]\n"); 2400 lcp.Close(sp); 2401 break; 2402 } 2403 } 2404 if (debug) 2405 addlog("\n"); 2406 drop: 2407 free(buf, M_TEMP); 2408 return; 2409 } 2410 2411 /* 2412 * Analyze the LCP Configure-NAK option list, and adjust our 2413 * negotiation. 2414 */ 2415 static void 2416 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2417 { 2418 STDDCL; 2419 u_char *buf, *p; 2420 uint32_t magic; 2421 2422 len -= 4; 2423 buf = malloc (len, M_TEMP, M_NOWAIT); 2424 if (!buf) 2425 return; 2426 2427 if (debug) 2428 log(LOG_DEBUG, "%s: lcp nak opts:", 2429 ifp->if_xname); 2430 2431 p = (void *)(h + 1); 2432 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2433 /* Sanity check option length */ 2434 if (p[1] > len) { 2435 /* 2436 * Malicious option - drop immediately. 2437 * XXX Maybe we should just RXJ it? 2438 */ 2439 addlog("%s: received malicious LCP option, " 2440 "dropping.\n", ifp->if_xname); 2441 goto drop; 2442 } 2443 if (debug) 2444 addlog(" %s", sppp_lcp_opt_name(*p)); 2445 switch (*p) { 2446 case LCP_OPT_MAGIC: 2447 /* Magic number -- renegotiate */ 2448 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2449 len >= 6 && p[1] == 6) { 2450 magic = (uint32_t)p[2] << 24 | 2451 (uint32_t)p[3] << 16 | p[4] << 8 | p[5]; 2452 /* 2453 * If the remote magic is our negated one, 2454 * this looks like a loopback problem. 2455 * Suggest a new magic to make sure. 2456 */ 2457 if (magic == ~sp->lcp.magic) { 2458 if (debug) 2459 addlog(" magic glitch"); 2460 sp->lcp.magic = cprng_fast32(); 2461 } else { 2462 sp->lcp.magic = magic; 2463 if (debug) 2464 addlog(" %d", magic); 2465 } 2466 } 2467 break; 2468 case LCP_OPT_MRU: 2469 /* 2470 * Peer wants to advise us to negotiate an MRU. 2471 * Agree on it if it's reasonable, or use 2472 * default otherwise. 2473 */ 2474 if (len >= 4 && p[1] == 4) { 2475 u_int mru = p[2] * 256 + p[3]; 2476 if (debug) 2477 addlog(" %d", mru); 2478 if (mru < PPP_MINMRU || mru > sp->pp_if.if_mtu) 2479 mru = sp->pp_if.if_mtu; 2480 sp->lcp.mru = mru; 2481 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2482 } 2483 break; 2484 case LCP_OPT_AUTH_PROTO: 2485 /* 2486 * Peer doesn't like our authentication method, 2487 * deny. 2488 */ 2489 if (debug) 2490 addlog("[access denied]\n"); 2491 lcp.Close(sp); 2492 break; 2493 } 2494 } 2495 if (debug) 2496 addlog("\n"); 2497 drop: 2498 free(buf, M_TEMP); 2499 return; 2500 } 2501 2502 static void 2503 sppp_lcp_tlu(struct sppp *sp) 2504 { 2505 STDDCL; 2506 int i; 2507 uint32_t mask; 2508 2509 /* XXX ? */ 2510 if (! (ifp->if_flags & IFF_UP) && 2511 (ifp->if_flags & IFF_RUNNING)) { 2512 /* Coming out of loopback mode. */ 2513 if_up(ifp); 2514 } 2515 2516 for (i = 0; i < IDX_COUNT; i++) 2517 if ((cps[i])->flags & CP_QUAL) 2518 (cps[i])->Open(sp); 2519 2520 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2521 (sp->pp_flags & PP_NEEDAUTH) != 0) 2522 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2523 else 2524 sp->pp_phase = SPPP_PHASE_NETWORK; 2525 2526 if (debug) 2527 { 2528 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2529 sppp_phase_name(sp->pp_phase)); 2530 } 2531 2532 /* 2533 * Open all authentication protocols. This is even required 2534 * if we already proceeded to network phase, since it might be 2535 * that remote wants us to authenticate, so we might have to 2536 * send a PAP request. Undesired authentication protocols 2537 * don't do anything when they get an Open event. 2538 */ 2539 for (i = 0; i < IDX_COUNT; i++) 2540 if ((cps[i])->flags & CP_AUTH) 2541 (cps[i])->Open(sp); 2542 2543 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2544 /* Notify all NCPs. */ 2545 for (i = 0; i < IDX_COUNT; i++) 2546 if ((cps[i])->flags & CP_NCP) 2547 (cps[i])->Open(sp); 2548 } 2549 2550 /* Send Up events to all started protos. */ 2551 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2552 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2553 (cps[i])->Up(sp); 2554 2555 /* notify low-level driver of state change */ 2556 if (sp->pp_chg) 2557 sp->pp_chg(sp, (int)sp->pp_phase); 2558 2559 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2560 /* if no NCP is starting, close down */ 2561 sppp_lcp_check_and_close(sp); 2562 } 2563 2564 static void 2565 sppp_lcp_tld(struct sppp *sp) 2566 { 2567 STDDCL; 2568 int i; 2569 uint32_t mask; 2570 2571 sp->pp_phase = SPPP_PHASE_TERMINATE; 2572 2573 if (debug) 2574 { 2575 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2576 sppp_phase_name(sp->pp_phase)); 2577 } 2578 2579 /* 2580 * Take upper layers down. We send the Down event first and 2581 * the Close second to prevent the upper layers from sending 2582 * ``a flurry of terminate-request packets'', as the RFC 2583 * describes it. 2584 */ 2585 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2586 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2587 (cps[i])->Down(sp); 2588 (cps[i])->Close(sp); 2589 } 2590 } 2591 2592 static void 2593 sppp_lcp_tls(struct sppp *sp) 2594 { 2595 STDDCL; 2596 2597 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2598 printf("%s: authentication failed %d times, not retrying again\n", 2599 sp->pp_if.if_xname, sp->pp_auth_failures); 2600 if_down(&sp->pp_if); 2601 return; 2602 } 2603 2604 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2605 2606 if (debug) 2607 { 2608 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2609 sppp_phase_name(sp->pp_phase)); 2610 } 2611 2612 /* Notify lower layer if desired. */ 2613 if (sp->pp_tls) 2614 (sp->pp_tls)(sp); 2615 } 2616 2617 static void 2618 sppp_lcp_tlf(struct sppp *sp) 2619 { 2620 STDDCL; 2621 2622 sp->pp_phase = SPPP_PHASE_DEAD; 2623 2624 if (debug) 2625 { 2626 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2627 sppp_phase_name(sp->pp_phase)); 2628 } 2629 2630 /* Notify lower layer if desired. */ 2631 if (sp->pp_tlf) 2632 (sp->pp_tlf)(sp); 2633 } 2634 2635 static void 2636 sppp_lcp_scr(struct sppp *sp) 2637 { 2638 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2639 int i = 0; 2640 u_short authproto; 2641 2642 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2643 if (! sp->lcp.magic) 2644 sp->lcp.magic = cprng_fast32(); 2645 opt[i++] = LCP_OPT_MAGIC; 2646 opt[i++] = 6; 2647 opt[i++] = sp->lcp.magic >> 24; 2648 opt[i++] = sp->lcp.magic >> 16; 2649 opt[i++] = sp->lcp.magic >> 8; 2650 opt[i++] = sp->lcp.magic; 2651 } 2652 2653 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2654 opt[i++] = LCP_OPT_MRU; 2655 opt[i++] = 4; 2656 opt[i++] = sp->lcp.mru >> 8; 2657 opt[i++] = sp->lcp.mru; 2658 } 2659 2660 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2661 authproto = sp->hisauth.proto; 2662 opt[i++] = LCP_OPT_AUTH_PROTO; 2663 opt[i++] = authproto == PPP_CHAP? 5: 4; 2664 opt[i++] = authproto >> 8; 2665 opt[i++] = authproto; 2666 if (authproto == PPP_CHAP) 2667 opt[i++] = CHAP_MD5; 2668 } 2669 2670 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2671 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2672 } 2673 2674 /* 2675 * Check the open NCPs, return true if at least one NCP is open. 2676 */ 2677 static int 2678 sppp_ncp_check(struct sppp *sp) 2679 { 2680 int i, mask; 2681 2682 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2683 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2684 return 1; 2685 return 0; 2686 } 2687 2688 /* 2689 * Re-check the open NCPs and see if we should terminate the link. 2690 * Called by the NCPs during their tlf action handling. 2691 */ 2692 static void 2693 sppp_lcp_check_and_close(struct sppp *sp) 2694 { 2695 2696 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2697 /* don't bother, we are already going down */ 2698 return; 2699 2700 if (sppp_ncp_check(sp)) 2701 return; 2702 2703 lcp.Close(sp); 2704 } 2705 2706 2707 /* 2708 *--------------------------------------------------------------------------* 2709 * * 2710 * The IPCP implementation. * 2711 * * 2712 *--------------------------------------------------------------------------* 2713 */ 2714 2715 static void 2716 sppp_ipcp_init(struct sppp *sp) 2717 { 2718 sp->ipcp.opts = 0; 2719 sp->ipcp.flags = 0; 2720 sp->state[IDX_IPCP] = STATE_INITIAL; 2721 sp->fail_counter[IDX_IPCP] = 0; 2722 sp->pp_seq[IDX_IPCP] = 0; 2723 sp->pp_rseq[IDX_IPCP] = 0; 2724 callout_init(&sp->ch[IDX_IPCP], 0); 2725 } 2726 2727 static void 2728 sppp_ipcp_up(struct sppp *sp) 2729 { 2730 sppp_up_event(&ipcp, sp); 2731 } 2732 2733 static void 2734 sppp_ipcp_down(struct sppp *sp) 2735 { 2736 sppp_down_event(&ipcp, sp); 2737 } 2738 2739 static void 2740 sppp_ipcp_open(struct sppp *sp) 2741 { 2742 STDDCL; 2743 uint32_t myaddr, hisaddr; 2744 2745 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2746 sp->ipcp.req_myaddr = 0; 2747 sp->ipcp.req_hisaddr = 0; 2748 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2749 2750 #ifdef INET 2751 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2752 #else 2753 myaddr = hisaddr = 0; 2754 #endif 2755 /* 2756 * If we don't have his address, this probably means our 2757 * interface doesn't want to talk IP at all. (This could 2758 * be the case if somebody wants to speak only IPX, for 2759 * example.) Don't open IPCP in this case. 2760 */ 2761 if (hisaddr == 0) { 2762 /* XXX this message should go away */ 2763 if (debug) 2764 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2765 ifp->if_xname); 2766 return; 2767 } 2768 2769 if (myaddr == 0) { 2770 /* 2771 * I don't have an assigned address, so i need to 2772 * negotiate my address. 2773 */ 2774 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2775 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2776 } 2777 if (hisaddr == 1) { 2778 /* 2779 * XXX - remove this hack! 2780 * remote has no valid address, we need to get one assigned. 2781 */ 2782 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2783 } 2784 sppp_open_event(&ipcp, sp); 2785 } 2786 2787 static void 2788 sppp_ipcp_close(struct sppp *sp) 2789 { 2790 STDDCL; 2791 2792 sppp_close_event(&ipcp, sp); 2793 #ifdef INET 2794 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2795 /* 2796 * Some address was dynamic, clear it again. 2797 */ 2798 sppp_clear_ip_addrs(sp); 2799 #endif 2800 2801 if (sp->pp_saved_mtu > 0) { 2802 ifp->if_mtu = sp->pp_saved_mtu; 2803 sp->pp_saved_mtu = 0; 2804 if (debug) 2805 log(LOG_DEBUG, 2806 "%s: resetting MTU to %" PRIu64 " bytes\n", 2807 ifp->if_xname, ifp->if_mtu); 2808 } 2809 } 2810 2811 static void 2812 sppp_ipcp_TO(void *cookie) 2813 { 2814 sppp_to_event(&ipcp, (struct sppp *)cookie); 2815 } 2816 2817 /* 2818 * Analyze a configure request. Return true if it was agreeable, and 2819 * caused action sca, false if it has been rejected or nak'ed, and 2820 * caused action scn. (The return value is used to make the state 2821 * transition decision in the state automaton.) 2822 */ 2823 static int 2824 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2825 { 2826 u_char *buf, *r, *p; 2827 struct ifnet *ifp = &sp->pp_if; 2828 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2829 uint32_t hisaddr, desiredaddr; 2830 2831 len -= 4; 2832 origlen = len; 2833 /* 2834 * Make sure to allocate a buf that can at least hold a 2835 * conf-nak with an `address' option. We might need it below. 2836 */ 2837 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2838 if (! buf) 2839 return (0); 2840 2841 /* pass 1: see if we can recognize them */ 2842 if (debug) 2843 log(LOG_DEBUG, "%s: ipcp parse opts:", 2844 ifp->if_xname); 2845 p = (void *)(h + 1); 2846 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2847 /* Sanity check option length */ 2848 if (p[1] > len) { 2849 /* XXX should we just RXJ? */ 2850 addlog("%s: malicious IPCP option received, dropping\n", 2851 ifp->if_xname); 2852 goto drop; 2853 } 2854 if (debug) 2855 addlog(" %s", sppp_ipcp_opt_name(*p)); 2856 switch (*p) { 2857 #ifdef notyet 2858 case IPCP_OPT_COMPRESSION: 2859 if (len >= 6 && p[1] >= 6) { 2860 /* correctly formed compress option */ 2861 continue; 2862 } 2863 if (debug) 2864 addlog(" [invalid]"); 2865 break; 2866 #endif 2867 case IPCP_OPT_ADDRESS: 2868 if (len >= 6 && p[1] == 6) { 2869 /* correctly formed address option */ 2870 continue; 2871 } 2872 if (debug) 2873 addlog(" [invalid]"); 2874 break; 2875 default: 2876 /* Others not supported. */ 2877 if (debug) 2878 addlog(" [rej]"); 2879 break; 2880 } 2881 /* Add the option to rejected list. */ 2882 bcopy (p, r, p[1]); 2883 r += p[1]; 2884 rlen += p[1]; 2885 } 2886 if (rlen) { 2887 if (debug) 2888 addlog(" send conf-rej\n"); 2889 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2890 goto end; 2891 } else if (debug) 2892 addlog("\n"); 2893 2894 /* pass 2: parse option values */ 2895 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2896 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2897 else 2898 #ifdef INET 2899 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2900 #else 2901 hisaddr = 0; 2902 #endif 2903 if (debug) 2904 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2905 ifp->if_xname); 2906 p = (void *)(h + 1); 2907 len = origlen; 2908 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2909 if (debug) 2910 addlog(" %s", sppp_ipcp_opt_name(*p)); 2911 switch (*p) { 2912 #ifdef notyet 2913 case IPCP_OPT_COMPRESSION: 2914 continue; 2915 #endif 2916 case IPCP_OPT_ADDRESS: 2917 desiredaddr = p[2] << 24 | p[3] << 16 | 2918 p[4] << 8 | p[5]; 2919 if (desiredaddr == hisaddr || 2920 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2921 /* 2922 * Peer's address is same as our value, 2923 * this is agreeable. Gonna conf-ack 2924 * it. 2925 */ 2926 if (debug) 2927 addlog(" %s [ack]", 2928 sppp_dotted_quad(hisaddr)); 2929 /* record that we've seen it already */ 2930 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2931 sp->ipcp.req_hisaddr = desiredaddr; 2932 hisaddr = desiredaddr; 2933 continue; 2934 } 2935 /* 2936 * The address wasn't agreeable. This is either 2937 * he sent us 0.0.0.0, asking to assign him an 2938 * address, or he send us another address not 2939 * matching our value. Either case, we gonna 2940 * conf-nak it with our value. 2941 */ 2942 if (debug) { 2943 if (desiredaddr == 0) 2944 addlog(" [addr requested]"); 2945 else 2946 addlog(" %s [not agreed]", 2947 sppp_dotted_quad(desiredaddr)); 2948 } 2949 2950 p[2] = hisaddr >> 24; 2951 p[3] = hisaddr >> 16; 2952 p[4] = hisaddr >> 8; 2953 p[5] = hisaddr; 2954 break; 2955 } 2956 /* Add the option to nak'ed list. */ 2957 bcopy (p, r, p[1]); 2958 r += p[1]; 2959 rlen += p[1]; 2960 } 2961 2962 /* 2963 * If we are about to conf-ack the request, but haven't seen 2964 * his address so far, gonna conf-nak it instead, with the 2965 * `address' option present and our idea of his address being 2966 * filled in there, to request negotiation of both addresses. 2967 * 2968 * XXX This can result in an endless req - nak loop if peer 2969 * doesn't want to send us his address. Q: What should we do 2970 * about it? XXX A: implement the max-failure counter. 2971 */ 2972 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2973 buf[0] = IPCP_OPT_ADDRESS; 2974 buf[1] = 6; 2975 buf[2] = hisaddr >> 24; 2976 buf[3] = hisaddr >> 16; 2977 buf[4] = hisaddr >> 8; 2978 buf[5] = hisaddr; 2979 rlen = 6; 2980 if (debug) 2981 addlog(" still need hisaddr"); 2982 } 2983 2984 if (rlen) { 2985 if (debug) 2986 addlog(" send conf-nak\n"); 2987 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2988 } else { 2989 if (debug) 2990 addlog(" send conf-ack\n"); 2991 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 2992 } 2993 2994 end: 2995 free(buf, M_TEMP); 2996 return (rlen == 0); 2997 2998 drop: 2999 free(buf, M_TEMP); 3000 return -1; 3001 } 3002 3003 /* 3004 * Analyze the IPCP Configure-Reject option list, and adjust our 3005 * negotiation. 3006 */ 3007 static void 3008 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3009 { 3010 u_char *buf, *p; 3011 struct ifnet *ifp = &sp->pp_if; 3012 int debug = ifp->if_flags & IFF_DEBUG; 3013 3014 len -= 4; 3015 buf = malloc (len, M_TEMP, M_NOWAIT); 3016 if (!buf) 3017 return; 3018 3019 if (debug) 3020 log(LOG_DEBUG, "%s: ipcp rej opts:", 3021 ifp->if_xname); 3022 3023 p = (void *)(h + 1); 3024 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3025 /* Sanity check option length */ 3026 if (p[1] > len) { 3027 /* XXX should we just RXJ? */ 3028 addlog("%s: malicious IPCP option received, dropping\n", 3029 ifp->if_xname); 3030 goto drop; 3031 } 3032 if (debug) 3033 addlog(" %s", sppp_ipcp_opt_name(*p)); 3034 switch (*p) { 3035 case IPCP_OPT_ADDRESS: 3036 /* 3037 * Peer doesn't grok address option. This is 3038 * bad. XXX Should we better give up here? 3039 */ 3040 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3041 break; 3042 #ifdef notyet 3043 case IPCP_OPT_COMPRESS: 3044 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3045 break; 3046 #endif 3047 } 3048 } 3049 if (debug) 3050 addlog("\n"); 3051 drop: 3052 free(buf, M_TEMP); 3053 return; 3054 } 3055 3056 /* 3057 * Analyze the IPCP Configure-NAK option list, and adjust our 3058 * negotiation. 3059 */ 3060 static void 3061 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3062 { 3063 u_char *p; 3064 struct ifnet *ifp = &sp->pp_if; 3065 int debug = ifp->if_flags & IFF_DEBUG; 3066 uint32_t wantaddr; 3067 3068 len -= 4; 3069 3070 if (debug) 3071 log(LOG_DEBUG, "%s: ipcp nak opts:", 3072 ifp->if_xname); 3073 3074 p = (void *)(h + 1); 3075 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3076 /* Sanity check option length */ 3077 if (p[1] > len) { 3078 /* XXX should we just RXJ? */ 3079 addlog("%s: malicious IPCP option received, dropping\n", 3080 ifp->if_xname); 3081 return; 3082 } 3083 if (debug) 3084 addlog(" %s", sppp_ipcp_opt_name(*p)); 3085 switch (*p) { 3086 case IPCP_OPT_ADDRESS: 3087 /* 3088 * Peer doesn't like our local IP address. See 3089 * if we can do something for him. We'll drop 3090 * him our address then. 3091 */ 3092 if (len >= 6 && p[1] == 6) { 3093 wantaddr = p[2] << 24 | p[3] << 16 | 3094 p[4] << 8 | p[5]; 3095 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3096 if (debug) 3097 addlog(" [wantaddr %s]", 3098 sppp_dotted_quad(wantaddr)); 3099 /* 3100 * When doing dynamic address assignment, 3101 * we accept his offer. Otherwise, we 3102 * ignore it and thus continue to negotiate 3103 * our already existing value. 3104 */ 3105 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3106 if (debug) 3107 addlog(" [agree]"); 3108 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3109 sp->ipcp.req_myaddr = wantaddr; 3110 } 3111 } 3112 break; 3113 3114 case IPCP_OPT_PRIMDNS: 3115 if (len >= 6 && p[1] == 6) { 3116 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3117 p[4] << 8 | p[5]; 3118 } 3119 break; 3120 3121 case IPCP_OPT_SECDNS: 3122 if (len >= 6 && p[1] == 6) { 3123 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3124 p[4] << 8 | p[5]; 3125 } 3126 break; 3127 #ifdef notyet 3128 case IPCP_OPT_COMPRESS: 3129 /* 3130 * Peer wants different compression parameters. 3131 */ 3132 break; 3133 #endif 3134 } 3135 } 3136 if (debug) 3137 addlog("\n"); 3138 } 3139 3140 static void 3141 sppp_ipcp_tlu(struct sppp *sp) 3142 { 3143 #ifdef INET 3144 /* we are up. Set addresses and notify anyone interested */ 3145 STDDCL; 3146 uint32_t myaddr, hisaddr; 3147 3148 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3149 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3150 myaddr = sp->ipcp.req_myaddr; 3151 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3152 hisaddr = sp->ipcp.req_hisaddr; 3153 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3154 3155 if (ifp->if_mtu > sp->lcp.their_mru) { 3156 sp->pp_saved_mtu = ifp->if_mtu; 3157 ifp->if_mtu = sp->lcp.their_mru; 3158 if (debug) 3159 log(LOG_DEBUG, 3160 "%s: setting MTU to %" PRIu64 " bytes\n", 3161 ifp->if_xname, ifp->if_mtu); 3162 } 3163 3164 if (sp->pp_con) 3165 sp->pp_con(sp); 3166 #endif 3167 } 3168 3169 static void 3170 sppp_ipcp_tld(struct sppp *sp) 3171 { 3172 } 3173 3174 static void 3175 sppp_ipcp_tls(struct sppp *sp) 3176 { 3177 /* indicate to LCP that it must stay alive */ 3178 sp->lcp.protos |= (1 << IDX_IPCP); 3179 } 3180 3181 static void 3182 sppp_ipcp_tlf(struct sppp *sp) 3183 { 3184 /* we no longer need LCP */ 3185 sp->lcp.protos &= ~(1 << IDX_IPCP); 3186 } 3187 3188 static void 3189 sppp_ipcp_scr(struct sppp *sp) 3190 { 3191 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3192 #ifdef INET 3193 uint32_t ouraddr; 3194 #endif 3195 int i = 0; 3196 3197 #ifdef notyet 3198 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3199 opt[i++] = IPCP_OPT_COMPRESSION; 3200 opt[i++] = 6; 3201 opt[i++] = 0; /* VJ header compression */ 3202 opt[i++] = 0x2d; /* VJ header compression */ 3203 opt[i++] = max_slot_id; 3204 opt[i++] = comp_slot_id; 3205 } 3206 #endif 3207 3208 #ifdef INET 3209 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3210 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3211 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3212 else 3213 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3214 opt[i++] = IPCP_OPT_ADDRESS; 3215 opt[i++] = 6; 3216 opt[i++] = ouraddr >> 24; 3217 opt[i++] = ouraddr >> 16; 3218 opt[i++] = ouraddr >> 8; 3219 opt[i++] = ouraddr; 3220 } 3221 #endif 3222 3223 if (sp->query_dns & 1) { 3224 opt[i++] = IPCP_OPT_PRIMDNS; 3225 opt[i++] = 6; 3226 opt[i++] = sp->dns_addrs[0] >> 24; 3227 opt[i++] = sp->dns_addrs[0] >> 16; 3228 opt[i++] = sp->dns_addrs[0] >> 8; 3229 opt[i++] = sp->dns_addrs[0]; 3230 } 3231 if (sp->query_dns & 2) { 3232 opt[i++] = IPCP_OPT_SECDNS; 3233 opt[i++] = 6; 3234 opt[i++] = sp->dns_addrs[1] >> 24; 3235 opt[i++] = sp->dns_addrs[1] >> 16; 3236 opt[i++] = sp->dns_addrs[1] >> 8; 3237 opt[i++] = sp->dns_addrs[1]; 3238 } 3239 3240 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3241 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3242 } 3243 3244 3245 /* 3246 *--------------------------------------------------------------------------* 3247 * * 3248 * The IPv6CP implementation. * 3249 * * 3250 *--------------------------------------------------------------------------* 3251 */ 3252 3253 #ifdef INET6 3254 static void 3255 sppp_ipv6cp_init(struct sppp *sp) 3256 { 3257 sp->ipv6cp.opts = 0; 3258 sp->ipv6cp.flags = 0; 3259 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3260 sp->fail_counter[IDX_IPV6CP] = 0; 3261 sp->pp_seq[IDX_IPV6CP] = 0; 3262 sp->pp_rseq[IDX_IPV6CP] = 0; 3263 callout_init(&sp->ch[IDX_IPV6CP], 0); 3264 } 3265 3266 static void 3267 sppp_ipv6cp_up(struct sppp *sp) 3268 { 3269 sppp_up_event(&ipv6cp, sp); 3270 } 3271 3272 static void 3273 sppp_ipv6cp_down(struct sppp *sp) 3274 { 3275 sppp_down_event(&ipv6cp, sp); 3276 } 3277 3278 static void 3279 sppp_ipv6cp_open(struct sppp *sp) 3280 { 3281 STDDCL; 3282 struct in6_addr myaddr, hisaddr; 3283 3284 #ifdef IPV6CP_MYIFID_DYN 3285 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3286 #else 3287 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3288 #endif 3289 3290 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3291 /* 3292 * If we don't have our address, this probably means our 3293 * interface doesn't want to talk IPv6 at all. (This could 3294 * be the case if somebody wants to speak only IPX, for 3295 * example.) Don't open IPv6CP in this case. 3296 */ 3297 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3298 /* XXX this message should go away */ 3299 if (debug) 3300 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3301 ifp->if_xname); 3302 return; 3303 } 3304 3305 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3306 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3307 sppp_open_event(&ipv6cp, sp); 3308 } 3309 3310 static void 3311 sppp_ipv6cp_close(struct sppp *sp) 3312 { 3313 sppp_close_event(&ipv6cp, sp); 3314 } 3315 3316 static void 3317 sppp_ipv6cp_TO(void *cookie) 3318 { 3319 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3320 } 3321 3322 /* 3323 * Analyze a configure request. Return true if it was agreeable, and 3324 * caused action sca, false if it has been rejected or nak'ed, and 3325 * caused action scn. (The return value is used to make the state 3326 * transition decision in the state automaton.) 3327 */ 3328 static int 3329 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3330 { 3331 u_char *buf, *r, *p; 3332 struct ifnet *ifp = &sp->pp_if; 3333 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3334 struct in6_addr myaddr, desiredaddr, suggestaddr; 3335 int ifidcount; 3336 int type; 3337 int collision, nohisaddr; 3338 3339 len -= 4; 3340 origlen = len; 3341 /* 3342 * Make sure to allocate a buf that can at least hold a 3343 * conf-nak with an `address' option. We might need it below. 3344 */ 3345 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3346 if (! buf) 3347 return (0); 3348 3349 /* pass 1: see if we can recognize them */ 3350 if (debug) 3351 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3352 ifp->if_xname); 3353 p = (void *)(h + 1); 3354 ifidcount = 0; 3355 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3356 /* Sanity check option length */ 3357 if (p[1] > len) { 3358 /* XXX just RXJ? */ 3359 addlog("%s: received malicious IPCPv6 option, " 3360 "dropping\n", ifp->if_xname); 3361 goto drop; 3362 } 3363 if (debug) 3364 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3365 switch (*p) { 3366 case IPV6CP_OPT_IFID: 3367 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3368 /* correctly formed address option */ 3369 ifidcount++; 3370 continue; 3371 } 3372 if (debug) 3373 addlog(" [invalid]"); 3374 break; 3375 #ifdef notyet 3376 case IPV6CP_OPT_COMPRESSION: 3377 if (len >= 4 && p[1] >= 4) { 3378 /* correctly formed compress option */ 3379 continue; 3380 } 3381 if (debug) 3382 addlog(" [invalid]"); 3383 break; 3384 #endif 3385 default: 3386 /* Others not supported. */ 3387 if (debug) 3388 addlog(" [rej]"); 3389 break; 3390 } 3391 /* Add the option to rejected list. */ 3392 bcopy (p, r, p[1]); 3393 r += p[1]; 3394 rlen += p[1]; 3395 } 3396 if (rlen) { 3397 if (debug) 3398 addlog(" send conf-rej\n"); 3399 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3400 goto end; 3401 } else if (debug) 3402 addlog("\n"); 3403 3404 /* pass 2: parse option values */ 3405 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3406 if (debug) 3407 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3408 ifp->if_xname); 3409 p = (void *)(h + 1); 3410 len = origlen; 3411 type = CONF_ACK; 3412 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3413 if (debug) 3414 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3415 switch (*p) { 3416 #ifdef notyet 3417 case IPV6CP_OPT_COMPRESSION: 3418 continue; 3419 #endif 3420 case IPV6CP_OPT_IFID: 3421 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3422 memcpy(&desiredaddr.s6_addr[8], &p[2], 8); 3423 collision = (memcmp(&desiredaddr.s6_addr[8], 3424 &myaddr.s6_addr[8], 8) == 0); 3425 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3426 3427 desiredaddr.s6_addr16[0] = htons(0xfe80); 3428 (void)in6_setscope(&desiredaddr, &sp->pp_if, NULL); 3429 3430 if (!collision && !nohisaddr) { 3431 /* no collision, hisaddr known - Conf-Ack */ 3432 type = CONF_ACK; 3433 3434 if (debug) { 3435 addlog(" %s [%s]", 3436 ip6_sprintf(&desiredaddr), 3437 sppp_cp_type_name(type)); 3438 } 3439 continue; 3440 } 3441 3442 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3443 if (collision && nohisaddr) { 3444 /* collision, hisaddr unknown - Conf-Rej */ 3445 type = CONF_REJ; 3446 memset(&p[2], 0, 8); 3447 } else { 3448 /* 3449 * - no collision, hisaddr unknown, or 3450 * - collision, hisaddr known 3451 * Conf-Nak, suggest hisaddr 3452 */ 3453 type = CONF_NAK; 3454 sppp_suggest_ip6_addr(sp, &suggestaddr); 3455 memcpy(&p[2], &suggestaddr.s6_addr[8], 8); 3456 } 3457 if (debug) 3458 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3459 sppp_cp_type_name(type)); 3460 break; 3461 } 3462 /* Add the option to nak'ed list. */ 3463 bcopy (p, r, p[1]); 3464 r += p[1]; 3465 rlen += p[1]; 3466 } 3467 3468 if (rlen == 0 && type == CONF_ACK) { 3469 if (debug) 3470 addlog(" send %s\n", sppp_cp_type_name(type)); 3471 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3472 } else { 3473 #ifdef notdef 3474 if (type == CONF_ACK) 3475 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3476 #endif 3477 3478 if (debug) { 3479 addlog(" send %s suggest %s\n", 3480 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3481 } 3482 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3483 } 3484 3485 end: 3486 free(buf, M_TEMP); 3487 return (rlen == 0); 3488 3489 drop: 3490 free(buf, M_TEMP); 3491 return -1; 3492 } 3493 3494 /* 3495 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3496 * negotiation. 3497 */ 3498 static void 3499 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3500 { 3501 u_char *buf, *p; 3502 struct ifnet *ifp = &sp->pp_if; 3503 int debug = ifp->if_flags & IFF_DEBUG; 3504 3505 len -= 4; 3506 buf = malloc (len, M_TEMP, M_NOWAIT); 3507 if (!buf) 3508 return; 3509 3510 if (debug) 3511 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3512 ifp->if_xname); 3513 3514 p = (void *)(h + 1); 3515 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3516 if (p[1] > len) { 3517 /* XXX just RXJ? */ 3518 addlog("%s: received malicious IPCPv6 option, " 3519 "dropping\n", ifp->if_xname); 3520 goto drop; 3521 } 3522 if (debug) 3523 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3524 switch (*p) { 3525 case IPV6CP_OPT_IFID: 3526 /* 3527 * Peer doesn't grok address option. This is 3528 * bad. XXX Should we better give up here? 3529 */ 3530 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3531 break; 3532 #ifdef notyet 3533 case IPV6CP_OPT_COMPRESS: 3534 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3535 break; 3536 #endif 3537 } 3538 } 3539 if (debug) 3540 addlog("\n"); 3541 drop: 3542 free(buf, M_TEMP); 3543 return; 3544 } 3545 3546 /* 3547 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3548 * negotiation. 3549 */ 3550 static void 3551 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3552 { 3553 u_char *buf, *p; 3554 struct ifnet *ifp = &sp->pp_if; 3555 int debug = ifp->if_flags & IFF_DEBUG; 3556 struct in6_addr suggestaddr; 3557 3558 len -= 4; 3559 buf = malloc (len, M_TEMP, M_NOWAIT); 3560 if (!buf) 3561 return; 3562 3563 if (debug) 3564 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3565 ifp->if_xname); 3566 3567 p = (void *)(h + 1); 3568 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3569 if (p[1] > len) { 3570 /* XXX just RXJ? */ 3571 addlog("%s: received malicious IPCPv6 option, " 3572 "dropping\n", ifp->if_xname); 3573 goto drop; 3574 } 3575 if (debug) 3576 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3577 switch (*p) { 3578 case IPV6CP_OPT_IFID: 3579 /* 3580 * Peer doesn't like our local ifid. See 3581 * if we can do something for him. We'll drop 3582 * him our address then. 3583 */ 3584 if (len < 10 || p[1] != 10) 3585 break; 3586 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3587 suggestaddr.s6_addr16[0] = htons(0xfe80); 3588 (void)in6_setscope(&suggestaddr, &sp->pp_if, NULL); 3589 memcpy(&suggestaddr.s6_addr[8], &p[2], 8); 3590 3591 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3592 if (debug) 3593 addlog(" [suggestaddr %s]", 3594 ip6_sprintf(&suggestaddr)); 3595 #ifdef IPV6CP_MYIFID_DYN 3596 /* 3597 * When doing dynamic address assignment, 3598 * we accept his offer. 3599 */ 3600 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3601 struct in6_addr lastsuggest; 3602 /* 3603 * If <suggested myaddr from peer> equals to 3604 * <hisaddr we have suggested last time>, 3605 * we have a collision. generate new random 3606 * ifid. 3607 */ 3608 sppp_suggest_ip6_addr(&lastsuggest); 3609 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3610 lastsuggest)) { 3611 if (debug) 3612 addlog(" [random]"); 3613 sppp_gen_ip6_addr(sp, &suggestaddr); 3614 } 3615 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3616 if (debug) 3617 addlog(" [agree]"); 3618 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3619 } 3620 #else 3621 /* 3622 * Since we do not do dynamic address assignment, 3623 * we ignore it and thus continue to negotiate 3624 * our already existing value. This can possibly 3625 * go into infinite request-reject loop. 3626 * 3627 * This is not likely because we normally use 3628 * ifid based on MAC-address. 3629 * If you have no ethernet card on the node, too bad. 3630 * XXX should we use fail_counter? 3631 */ 3632 #endif 3633 break; 3634 #ifdef notyet 3635 case IPV6CP_OPT_COMPRESS: 3636 /* 3637 * Peer wants different compression parameters. 3638 */ 3639 break; 3640 #endif 3641 } 3642 } 3643 if (debug) 3644 addlog("\n"); 3645 drop: 3646 free(buf, M_TEMP); 3647 return; 3648 } 3649 3650 static void 3651 sppp_ipv6cp_tlu(struct sppp *sp) 3652 { 3653 /* we are up - notify isdn daemon */ 3654 if (sp->pp_con) 3655 sp->pp_con(sp); 3656 } 3657 3658 static void 3659 sppp_ipv6cp_tld(struct sppp *sp) 3660 { 3661 } 3662 3663 static void 3664 sppp_ipv6cp_tls(struct sppp *sp) 3665 { 3666 /* indicate to LCP that it must stay alive */ 3667 sp->lcp.protos |= (1 << IDX_IPV6CP); 3668 } 3669 3670 static void 3671 sppp_ipv6cp_tlf(struct sppp *sp) 3672 { 3673 /* we no longer need LCP */ 3674 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3675 } 3676 3677 static void 3678 sppp_ipv6cp_scr(struct sppp *sp) 3679 { 3680 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3681 struct in6_addr ouraddr; 3682 int i = 0; 3683 3684 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3685 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3686 opt[i++] = IPV6CP_OPT_IFID; 3687 opt[i++] = 10; 3688 memcpy(&opt[i], &ouraddr.s6_addr[8], 8); 3689 i += 8; 3690 } 3691 3692 #ifdef notyet 3693 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3694 opt[i++] = IPV6CP_OPT_COMPRESSION; 3695 opt[i++] = 4; 3696 opt[i++] = 0; /* TBD */ 3697 opt[i++] = 0; /* TBD */ 3698 /* variable length data may follow */ 3699 } 3700 #endif 3701 3702 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3703 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3704 } 3705 #else /*INET6*/ 3706 static void 3707 sppp_ipv6cp_init(struct sppp *sp) 3708 { 3709 } 3710 3711 static void 3712 sppp_ipv6cp_up(struct sppp *sp) 3713 { 3714 } 3715 3716 static void 3717 sppp_ipv6cp_down(struct sppp *sp) 3718 { 3719 } 3720 3721 static void 3722 sppp_ipv6cp_open(struct sppp *sp) 3723 { 3724 } 3725 3726 static void 3727 sppp_ipv6cp_close(struct sppp *sp) 3728 { 3729 } 3730 3731 static void 3732 sppp_ipv6cp_TO(void *sp) 3733 { 3734 } 3735 3736 static int 3737 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, 3738 int len) 3739 { 3740 return 0; 3741 } 3742 3743 static void 3744 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, 3745 int len) 3746 { 3747 } 3748 3749 static void 3750 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, 3751 int len) 3752 { 3753 } 3754 3755 static void 3756 sppp_ipv6cp_tlu(struct sppp *sp) 3757 { 3758 } 3759 3760 static void 3761 sppp_ipv6cp_tld(struct sppp *sp) 3762 { 3763 } 3764 3765 static void 3766 sppp_ipv6cp_tls(struct sppp *sp) 3767 { 3768 } 3769 3770 static void 3771 sppp_ipv6cp_tlf(struct sppp *sp) 3772 { 3773 } 3774 3775 static void 3776 sppp_ipv6cp_scr(struct sppp *sp) 3777 { 3778 } 3779 #endif /*INET6*/ 3780 3781 3782 /* 3783 *--------------------------------------------------------------------------* 3784 * * 3785 * The CHAP implementation. * 3786 * * 3787 *--------------------------------------------------------------------------* 3788 */ 3789 3790 /* 3791 * The authentication protocols don't employ a full-fledged state machine as 3792 * the control protocols do, since they do have Open and Close events, but 3793 * not Up and Down, nor are they explicitly terminated. Also, use of the 3794 * authentication protocols may be different in both directions (this makes 3795 * sense, think of a machine that never accepts incoming calls but only 3796 * calls out, it doesn't require the called party to authenticate itself). 3797 * 3798 * Our state machine for the local authentication protocol (we are requesting 3799 * the peer to authenticate) looks like: 3800 * 3801 * RCA- 3802 * +--------------------------------------------+ 3803 * V scn,tld| 3804 * +--------+ Close +---------+ RCA+ 3805 * | |<----------------------------------| |------+ 3806 * +--->| Closed | TO* | Opened | sca | 3807 * | | |-----+ +-------| |<-----+ 3808 * | +--------+ irc | | +---------+ 3809 * | ^ | | ^ 3810 * | | | | | 3811 * | | | | | 3812 * | TO-| | | | 3813 * | |tld TO+ V | | 3814 * | | +------->+ | | 3815 * | | | | | | 3816 * | +--------+ V | | 3817 * | | |<----+<--------------------+ | 3818 * | | Req- | scr | 3819 * | | Sent | | 3820 * | | | | 3821 * | +--------+ | 3822 * | RCA- | | RCA+ | 3823 * +------+ +------------------------------------------+ 3824 * scn,tld sca,irc,ict,tlu 3825 * 3826 * 3827 * with: 3828 * 3829 * Open: LCP reached authentication phase 3830 * Close: LCP reached terminate phase 3831 * 3832 * RCA+: received reply (pap-req, chap-response), acceptable 3833 * RCN: received reply (pap-req, chap-response), not acceptable 3834 * TO+: timeout with restart counter >= 0 3835 * TO-: timeout with restart counter < 0 3836 * TO*: reschedule timeout for CHAP 3837 * 3838 * scr: send request packet (none for PAP, chap-challenge) 3839 * sca: send ack packet (pap-ack, chap-success) 3840 * scn: send nak packet (pap-nak, chap-failure) 3841 * ict: initialize re-challenge timer (CHAP only) 3842 * 3843 * tlu: this-layer-up, LCP reaches network phase 3844 * tld: this-layer-down, LCP enters terminate phase 3845 * 3846 * Note that in CHAP mode, after sending a new challenge, while the state 3847 * automaton falls back into Req-Sent state, it doesn't signal a tld 3848 * event to LCP, so LCP remains in network phase. Only after not getting 3849 * any response (or after getting an unacceptable response), CHAP closes, 3850 * causing LCP to enter terminate phase. 3851 * 3852 * With PAP, there is no initial request that can be sent. The peer is 3853 * expected to send one based on the successful negotiation of PAP as 3854 * the authentication protocol during the LCP option negotiation. 3855 * 3856 * Incoming authentication protocol requests (remote requests 3857 * authentication, we are peer) don't employ a state machine at all, 3858 * they are simply answered. Some peers [Ascend P50 firmware rev 3859 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3860 * still in authentication phase (thereby violating the standard that 3861 * demands that these NCP packets are to be discarded), so we keep 3862 * track of the peer demanding us to authenticate, and only proceed to 3863 * phase network once we've seen a positive acknowledge for the 3864 * authentication. 3865 */ 3866 3867 /* 3868 * Handle incoming CHAP packets. 3869 */ 3870 void 3871 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3872 { 3873 STDDCL; 3874 struct lcp_header *h; 3875 int len, x; 3876 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3877 int value_len, name_len; 3878 MD5_CTX ctx; 3879 3880 len = m->m_pkthdr.len; 3881 if (len < 4) { 3882 if (debug) 3883 log(LOG_DEBUG, 3884 "%s: chap invalid packet length: %d bytes\n", 3885 ifp->if_xname, len); 3886 return; 3887 } 3888 h = mtod(m, struct lcp_header *); 3889 if (len > ntohs(h->len)) 3890 len = ntohs(h->len); 3891 3892 switch (h->type) { 3893 /* challenge, failure and success are his authproto */ 3894 case CHAP_CHALLENGE: 3895 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3896 /* can't do anything useful */ 3897 sp->pp_auth_failures++; 3898 printf("%s: chap input without my name and my secret being set\n", 3899 ifp->if_xname); 3900 break; 3901 } 3902 value = 1 + (u_char *)(h + 1); 3903 value_len = value[-1]; 3904 name = value + value_len; 3905 name_len = len - value_len - 5; 3906 if (name_len < 0) { 3907 if (debug) { 3908 log(LOG_DEBUG, 3909 "%s: chap corrupted challenge " 3910 "<%s id=0x%x len=%d", 3911 ifp->if_xname, 3912 sppp_auth_type_name(PPP_CHAP, h->type), 3913 h->ident, ntohs(h->len)); 3914 if (len > 4) 3915 sppp_print_bytes((u_char *)(h + 1), 3916 len - 4); 3917 addlog(">\n"); 3918 } 3919 break; 3920 } 3921 3922 if (debug) { 3923 log(LOG_DEBUG, 3924 "%s: chap input <%s id=0x%x len=%d name=", 3925 ifp->if_xname, 3926 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3927 ntohs(h->len)); 3928 sppp_print_string((char *) name, name_len); 3929 addlog(" value-size=%d value=", value_len); 3930 sppp_print_bytes(value, value_len); 3931 addlog(">\n"); 3932 } 3933 3934 /* Compute reply value. */ 3935 MD5Init(&ctx); 3936 MD5Update(&ctx, &h->ident, 1); 3937 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3938 MD5Update(&ctx, value, value_len); 3939 MD5Final(digest, &ctx); 3940 dsize = sizeof digest; 3941 3942 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3943 sizeof dsize, (const char *)&dsize, 3944 sizeof digest, digest, 3945 sp->myauth.name_len, 3946 sp->myauth.name, 3947 0); 3948 break; 3949 3950 case CHAP_SUCCESS: 3951 if (debug) { 3952 log(LOG_DEBUG, "%s: chap success", 3953 ifp->if_xname); 3954 if (len > 4) { 3955 addlog(": "); 3956 sppp_print_string((char *)(h + 1), len - 4); 3957 } 3958 addlog("\n"); 3959 } 3960 x = splnet(); 3961 sp->pp_auth_failures = 0; 3962 sp->pp_flags &= ~PP_NEEDAUTH; 3963 if (sp->myauth.proto == PPP_CHAP && 3964 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3965 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3966 /* 3967 * We are authenticator for CHAP but didn't 3968 * complete yet. Leave it to tlu to proceed 3969 * to network phase. 3970 */ 3971 splx(x); 3972 break; 3973 } 3974 splx(x); 3975 sppp_phase_network(sp); 3976 break; 3977 3978 case CHAP_FAILURE: 3979 x = splnet(); 3980 sp->pp_auth_failures++; 3981 splx(x); 3982 if (debug) { 3983 log(LOG_INFO, "%s: chap failure", 3984 ifp->if_xname); 3985 if (len > 4) { 3986 addlog(": "); 3987 sppp_print_string((char *)(h + 1), len - 4); 3988 } 3989 addlog("\n"); 3990 } else 3991 log(LOG_INFO, "%s: chap failure\n", 3992 ifp->if_xname); 3993 /* await LCP shutdown by authenticator */ 3994 break; 3995 3996 /* response is my authproto */ 3997 case CHAP_RESPONSE: 3998 if (sp->hisauth.secret == NULL) { 3999 /* can't do anything useful */ 4000 printf("%s: chap input without his secret being set\n", 4001 ifp->if_xname); 4002 break; 4003 } 4004 value = 1 + (u_char *)(h + 1); 4005 value_len = value[-1]; 4006 name = value + value_len; 4007 name_len = len - value_len - 5; 4008 if (name_len < 0) { 4009 if (debug) { 4010 log(LOG_DEBUG, 4011 "%s: chap corrupted response " 4012 "<%s id=0x%x len=%d", 4013 ifp->if_xname, 4014 sppp_auth_type_name(PPP_CHAP, h->type), 4015 h->ident, ntohs(h->len)); 4016 if (len > 4) 4017 sppp_print_bytes((u_char *)(h + 1), 4018 len - 4); 4019 addlog(">\n"); 4020 } 4021 break; 4022 } 4023 if (h->ident != sp->confid[IDX_CHAP]) { 4024 if (debug) 4025 log(LOG_DEBUG, 4026 "%s: chap dropping response for old ID " 4027 "(got %d, expected %d)\n", 4028 ifp->if_xname, 4029 h->ident, sp->confid[IDX_CHAP]); 4030 break; 4031 } 4032 if (sp->hisauth.name != NULL && 4033 (name_len != sp->hisauth.name_len 4034 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 4035 log(LOG_INFO, "%s: chap response, his name ", 4036 ifp->if_xname); 4037 sppp_print_string(name, name_len); 4038 addlog(" != expected "); 4039 sppp_print_string(sp->hisauth.name, 4040 sp->hisauth.name_len); 4041 addlog("\n"); 4042 goto chap_failure; 4043 } 4044 if (debug) { 4045 log(LOG_DEBUG, "%s: chap input(%s) " 4046 "<%s id=0x%x len=%d name=", 4047 ifp->if_xname, 4048 sppp_state_name(sp->state[IDX_CHAP]), 4049 sppp_auth_type_name(PPP_CHAP, h->type), 4050 h->ident, ntohs(h->len)); 4051 sppp_print_string((char *)name, name_len); 4052 addlog(" value-size=%d value=", value_len); 4053 sppp_print_bytes(value, value_len); 4054 addlog(">\n"); 4055 } 4056 if (value_len != sizeof(sp->myauth.challenge)) { 4057 if (debug) 4058 log(LOG_DEBUG, 4059 "%s: chap bad hash value length: " 4060 "%d bytes, should be %ld\n", 4061 ifp->if_xname, value_len, 4062 (long) sizeof(sp->myauth.challenge)); 4063 goto chap_failure; 4064 } 4065 4066 MD5Init(&ctx); 4067 MD5Update(&ctx, &h->ident, 1); 4068 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 4069 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 4070 MD5Final(digest, &ctx); 4071 4072 #define FAILMSG "Failed..." 4073 #define SUCCMSG "Welcome!" 4074 4075 if (value_len != sizeof digest || 4076 memcmp(digest, value, value_len) != 0) { 4077 chap_failure: 4078 /* action scn, tld */ 4079 x = splnet(); 4080 sp->pp_auth_failures++; 4081 splx(x); 4082 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4083 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4084 0); 4085 chap.tld(sp); 4086 break; 4087 } 4088 sp->pp_auth_failures = 0; 4089 /* action sca, perhaps tlu */ 4090 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4091 sp->state[IDX_CHAP] == STATE_OPENED) 4092 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4093 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4094 0); 4095 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4096 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4097 chap.tlu(sp); 4098 } 4099 break; 4100 4101 default: 4102 /* Unknown CHAP packet type -- ignore. */ 4103 if (debug) { 4104 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4105 "<0x%x id=0x%xh len=%d", 4106 ifp->if_xname, 4107 sppp_state_name(sp->state[IDX_CHAP]), 4108 h->type, h->ident, ntohs(h->len)); 4109 if (len > 4) 4110 sppp_print_bytes((u_char *)(h + 1), len - 4); 4111 addlog(">\n"); 4112 } 4113 break; 4114 4115 } 4116 } 4117 4118 static void 4119 sppp_chap_init(struct sppp *sp) 4120 { 4121 /* Chap doesn't have STATE_INITIAL at all. */ 4122 sp->state[IDX_CHAP] = STATE_CLOSED; 4123 sp->fail_counter[IDX_CHAP] = 0; 4124 sp->pp_seq[IDX_CHAP] = 0; 4125 sp->pp_rseq[IDX_CHAP] = 0; 4126 callout_init(&sp->ch[IDX_CHAP], 0); 4127 } 4128 4129 static void 4130 sppp_chap_open(struct sppp *sp) 4131 { 4132 if (sp->myauth.proto == PPP_CHAP && 4133 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4134 /* we are authenticator for CHAP, start it */ 4135 chap.scr(sp); 4136 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4137 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4138 } 4139 /* nothing to be done if we are peer, await a challenge */ 4140 } 4141 4142 static void 4143 sppp_chap_close(struct sppp *sp) 4144 { 4145 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4146 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4147 } 4148 4149 static void 4150 sppp_chap_TO(void *cookie) 4151 { 4152 struct sppp *sp = (struct sppp *)cookie; 4153 STDDCL; 4154 int s; 4155 4156 s = splnet(); 4157 if (debug) 4158 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4159 ifp->if_xname, 4160 sppp_state_name(sp->state[IDX_CHAP]), 4161 sp->rst_counter[IDX_CHAP]); 4162 4163 if (--sp->rst_counter[IDX_CHAP] < 0) 4164 /* TO- event */ 4165 switch (sp->state[IDX_CHAP]) { 4166 case STATE_REQ_SENT: 4167 chap.tld(sp); 4168 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4169 break; 4170 } 4171 else 4172 /* TO+ (or TO*) event */ 4173 switch (sp->state[IDX_CHAP]) { 4174 case STATE_OPENED: 4175 /* TO* event */ 4176 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4177 /* fall through */ 4178 case STATE_REQ_SENT: 4179 chap.scr(sp); 4180 /* sppp_cp_change_state() will restart the timer */ 4181 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4182 break; 4183 } 4184 4185 splx(s); 4186 } 4187 4188 static void 4189 sppp_chap_tlu(struct sppp *sp) 4190 { 4191 STDDCL; 4192 int i, x; 4193 4194 i = 0; 4195 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4196 4197 /* 4198 * Some broken CHAP implementations (Conware CoNet, firmware 4199 * 4.0.?) don't want to re-authenticate their CHAP once the 4200 * initial challenge-response exchange has taken place. 4201 * Provide for an option to avoid rechallenges. 4202 */ 4203 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4204 /* 4205 * Compute the re-challenge timeout. This will yield 4206 * a number between 300 and 810 seconds. 4207 */ 4208 i = 300 + ((unsigned)(cprng_fast32() & 0xff00) >> 7); 4209 4210 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4211 } 4212 4213 if (debug) { 4214 log(LOG_DEBUG, 4215 "%s: chap %s, ", 4216 ifp->if_xname, 4217 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4218 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4219 addlog("next re-challenge in %d seconds\n", i); 4220 else 4221 addlog("re-challenging supressed\n"); 4222 } 4223 4224 x = splnet(); 4225 sp->pp_auth_failures = 0; 4226 /* indicate to LCP that we need to be closed down */ 4227 sp->lcp.protos |= (1 << IDX_CHAP); 4228 4229 if (sp->pp_flags & PP_NEEDAUTH) { 4230 /* 4231 * Remote is authenticator, but his auth proto didn't 4232 * complete yet. Defer the transition to network 4233 * phase. 4234 */ 4235 splx(x); 4236 return; 4237 } 4238 splx(x); 4239 4240 /* 4241 * If we are already in phase network, we are done here. This 4242 * is the case if this is a dummy tlu event after a re-challenge. 4243 */ 4244 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4245 sppp_phase_network(sp); 4246 } 4247 4248 static void 4249 sppp_chap_tld(struct sppp *sp) 4250 { 4251 STDDCL; 4252 4253 if (debug) 4254 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4255 callout_stop(&sp->ch[IDX_CHAP]); 4256 sp->lcp.protos &= ~(1 << IDX_CHAP); 4257 4258 lcp.Close(sp); 4259 } 4260 4261 static void 4262 sppp_chap_scr(struct sppp *sp) 4263 { 4264 uint32_t *ch; 4265 u_char clen = 4 * sizeof(uint32_t); 4266 4267 if (sp->myauth.name == NULL) { 4268 /* can't do anything useful */ 4269 printf("%s: chap starting without my name being set\n", 4270 sp->pp_if.if_xname); 4271 return; 4272 } 4273 4274 /* Compute random challenge. */ 4275 ch = (uint32_t *)sp->myauth.challenge; 4276 cprng_strong(kern_cprng, ch, clen, 0); 4277 4278 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4279 4280 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4281 sizeof clen, (const char *)&clen, 4282 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4283 sp->myauth.name_len, 4284 sp->myauth.name, 4285 0); 4286 } 4287 4288 /* 4289 *--------------------------------------------------------------------------* 4290 * * 4291 * The PAP implementation. * 4292 * * 4293 *--------------------------------------------------------------------------* 4294 */ 4295 /* 4296 * For PAP, we need to keep a little state also if we are the peer, not the 4297 * authenticator. This is since we don't get a request to authenticate, but 4298 * have to repeatedly authenticate ourself until we got a response (or the 4299 * retry counter is expired). 4300 */ 4301 4302 /* 4303 * Handle incoming PAP packets. */ 4304 static void 4305 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4306 { 4307 STDDCL; 4308 struct lcp_header *h; 4309 int len, x; 4310 u_char mlen; 4311 char *name, *secret; 4312 int name_len, secret_len; 4313 4314 /* 4315 * Malicious input might leave this uninitialized, so 4316 * init to an impossible value. 4317 */ 4318 secret_len = -1; 4319 4320 len = m->m_pkthdr.len; 4321 if (len < 5) { 4322 if (debug) 4323 log(LOG_DEBUG, 4324 "%s: pap invalid packet length: %d bytes\n", 4325 ifp->if_xname, len); 4326 return; 4327 } 4328 h = mtod(m, struct lcp_header *); 4329 if (len > ntohs(h->len)) 4330 len = ntohs(h->len); 4331 switch (h->type) { 4332 /* PAP request is my authproto */ 4333 case PAP_REQ: 4334 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4335 /* can't do anything useful */ 4336 printf("%s: pap request without his name and his secret being set\n", 4337 ifp->if_xname); 4338 break; 4339 } 4340 name = 1 + (u_char *)(h + 1); 4341 name_len = name[-1]; 4342 secret = name + name_len + 1; 4343 if (name_len > len - 6 || 4344 (secret_len = secret[-1]) > len - 6 - name_len) { 4345 if (debug) { 4346 log(LOG_DEBUG, "%s: pap corrupted input " 4347 "<%s id=0x%x len=%d", 4348 ifp->if_xname, 4349 sppp_auth_type_name(PPP_PAP, h->type), 4350 h->ident, ntohs(h->len)); 4351 if (len > 4) 4352 sppp_print_bytes((u_char *)(h + 1), 4353 len - 4); 4354 addlog(">\n"); 4355 } 4356 break; 4357 } 4358 if (debug) { 4359 log(LOG_DEBUG, "%s: pap input(%s) " 4360 "<%s id=0x%x len=%d name=", 4361 ifp->if_xname, 4362 sppp_state_name(sp->state[IDX_PAP]), 4363 sppp_auth_type_name(PPP_PAP, h->type), 4364 h->ident, ntohs(h->len)); 4365 sppp_print_string((char *)name, name_len); 4366 addlog(" secret="); 4367 sppp_print_string((char *)secret, secret_len); 4368 addlog(">\n"); 4369 } 4370 if (name_len != sp->hisauth.name_len || 4371 secret_len != sp->hisauth.secret_len || 4372 memcmp(name, sp->hisauth.name, name_len) != 0 || 4373 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4374 /* action scn, tld */ 4375 sp->pp_auth_failures++; 4376 mlen = sizeof(FAILMSG) - 1; 4377 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4378 sizeof mlen, (const char *)&mlen, 4379 sizeof(FAILMSG) - 1, (const u_char *)FAILMSG, 4380 0); 4381 pap.tld(sp); 4382 break; 4383 } 4384 /* action sca, perhaps tlu */ 4385 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4386 sp->state[IDX_PAP] == STATE_OPENED) { 4387 mlen = sizeof(SUCCMSG) - 1; 4388 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4389 sizeof mlen, (const char *)&mlen, 4390 sizeof(SUCCMSG) - 1, (const u_char *)SUCCMSG, 4391 0); 4392 } 4393 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4394 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4395 pap.tlu(sp); 4396 } 4397 break; 4398 4399 /* ack and nak are his authproto */ 4400 case PAP_ACK: 4401 callout_stop(&sp->pap_my_to_ch); 4402 if (debug) { 4403 log(LOG_DEBUG, "%s: pap success", 4404 ifp->if_xname); 4405 name = 1 + (u_char *)(h + 1); 4406 name_len = name[-1]; 4407 if (len > 5 && name_len < len+4) { 4408 addlog(": "); 4409 sppp_print_string(name, name_len); 4410 } 4411 addlog("\n"); 4412 } 4413 x = splnet(); 4414 sp->pp_auth_failures = 0; 4415 sp->pp_flags &= ~PP_NEEDAUTH; 4416 if (sp->myauth.proto == PPP_PAP && 4417 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4418 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4419 /* 4420 * We are authenticator for PAP but didn't 4421 * complete yet. Leave it to tlu to proceed 4422 * to network phase. 4423 */ 4424 splx(x); 4425 break; 4426 } 4427 splx(x); 4428 sppp_phase_network(sp); 4429 break; 4430 4431 case PAP_NAK: 4432 callout_stop(&sp->pap_my_to_ch); 4433 sp->pp_auth_failures++; 4434 if (debug) { 4435 log(LOG_INFO, "%s: pap failure", 4436 ifp->if_xname); 4437 name = 1 + (u_char *)(h + 1); 4438 name_len = name[-1]; 4439 if (len > 5 && name_len < len+4) { 4440 addlog(": "); 4441 sppp_print_string(name, name_len); 4442 } 4443 addlog("\n"); 4444 } else 4445 log(LOG_INFO, "%s: pap failure\n", 4446 ifp->if_xname); 4447 /* await LCP shutdown by authenticator */ 4448 break; 4449 4450 default: 4451 /* Unknown PAP packet type -- ignore. */ 4452 if (debug) { 4453 log(LOG_DEBUG, "%s: pap corrupted input " 4454 "<0x%x id=0x%x len=%d", 4455 ifp->if_xname, 4456 h->type, h->ident, ntohs(h->len)); 4457 if (len > 4) 4458 sppp_print_bytes((u_char *)(h + 1), len - 4); 4459 addlog(">\n"); 4460 } 4461 break; 4462 4463 } 4464 } 4465 4466 static void 4467 sppp_pap_init(struct sppp *sp) 4468 { 4469 /* PAP doesn't have STATE_INITIAL at all. */ 4470 sp->state[IDX_PAP] = STATE_CLOSED; 4471 sp->fail_counter[IDX_PAP] = 0; 4472 sp->pp_seq[IDX_PAP] = 0; 4473 sp->pp_rseq[IDX_PAP] = 0; 4474 callout_init(&sp->ch[IDX_PAP], 0); 4475 callout_init(&sp->pap_my_to_ch, 0); 4476 } 4477 4478 static void 4479 sppp_pap_open(struct sppp *sp) 4480 { 4481 if (sp->hisauth.proto == PPP_PAP && 4482 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4483 /* we are authenticator for PAP, start our timer */ 4484 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4485 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4486 } 4487 if (sp->myauth.proto == PPP_PAP) { 4488 /* we are peer, send a request, and start a timer */ 4489 pap.scr(sp); 4490 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4491 sppp_pap_my_TO, sp); 4492 } 4493 } 4494 4495 static void 4496 sppp_pap_close(struct sppp *sp) 4497 { 4498 if (sp->state[IDX_PAP] != STATE_CLOSED) 4499 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4500 } 4501 4502 /* 4503 * That's the timeout routine if we are authenticator. Since the 4504 * authenticator is basically passive in PAP, we can't do much here. 4505 */ 4506 static void 4507 sppp_pap_TO(void *cookie) 4508 { 4509 struct sppp *sp = (struct sppp *)cookie; 4510 STDDCL; 4511 int s; 4512 4513 s = splnet(); 4514 if (debug) 4515 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4516 ifp->if_xname, 4517 sppp_state_name(sp->state[IDX_PAP]), 4518 sp->rst_counter[IDX_PAP]); 4519 4520 if (--sp->rst_counter[IDX_PAP] < 0) 4521 /* TO- event */ 4522 switch (sp->state[IDX_PAP]) { 4523 case STATE_REQ_SENT: 4524 pap.tld(sp); 4525 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4526 break; 4527 } 4528 else 4529 /* TO+ event, not very much we could do */ 4530 switch (sp->state[IDX_PAP]) { 4531 case STATE_REQ_SENT: 4532 /* sppp_cp_change_state() will restart the timer */ 4533 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4534 break; 4535 } 4536 4537 splx(s); 4538 } 4539 4540 /* 4541 * That's the timeout handler if we are peer. Since the peer is active, 4542 * we need to retransmit our PAP request since it is apparently lost. 4543 * XXX We should impose a max counter. 4544 */ 4545 static void 4546 sppp_pap_my_TO(void *cookie) 4547 { 4548 struct sppp *sp = (struct sppp *)cookie; 4549 STDDCL; 4550 4551 if (debug) 4552 log(LOG_DEBUG, "%s: pap peer TO\n", 4553 ifp->if_xname); 4554 4555 pap.scr(sp); 4556 } 4557 4558 static void 4559 sppp_pap_tlu(struct sppp *sp) 4560 { 4561 STDDCL; 4562 int x; 4563 4564 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4565 4566 if (debug) 4567 log(LOG_DEBUG, "%s: %s tlu\n", 4568 ifp->if_xname, pap.name); 4569 4570 x = splnet(); 4571 sp->pp_auth_failures = 0; 4572 /* indicate to LCP that we need to be closed down */ 4573 sp->lcp.protos |= (1 << IDX_PAP); 4574 4575 if (sp->pp_flags & PP_NEEDAUTH) { 4576 /* 4577 * Remote is authenticator, but his auth proto didn't 4578 * complete yet. Defer the transition to network 4579 * phase. 4580 */ 4581 splx(x); 4582 return; 4583 } 4584 splx(x); 4585 sppp_phase_network(sp); 4586 } 4587 4588 static void 4589 sppp_pap_tld(struct sppp *sp) 4590 { 4591 STDDCL; 4592 4593 if (debug) 4594 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4595 callout_stop(&sp->ch[IDX_PAP]); 4596 callout_stop(&sp->pap_my_to_ch); 4597 sp->lcp.protos &= ~(1 << IDX_PAP); 4598 4599 lcp.Close(sp); 4600 } 4601 4602 static void 4603 sppp_pap_scr(struct sppp *sp) 4604 { 4605 u_char idlen, pwdlen; 4606 4607 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4608 /* can't do anything useful */ 4609 printf("%s: pap starting without my name and secret being set\n", 4610 sp->pp_if.if_xname); 4611 return; 4612 } 4613 4614 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4615 pwdlen = sp->myauth.secret_len; 4616 idlen = sp->myauth.name_len; 4617 4618 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4619 sizeof idlen, (const char *)&idlen, 4620 idlen, sp->myauth.name, 4621 sizeof pwdlen, (const char *)&pwdlen, 4622 pwdlen, sp->myauth.secret, 4623 0); 4624 } 4625 4626 /* 4627 * Random miscellaneous functions. 4628 */ 4629 4630 /* 4631 * Send a PAP or CHAP proto packet. 4632 * 4633 * Varadic function, each of the elements for the ellipsis is of type 4634 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4635 * mlen == 0. 4636 * NOTE: never declare variadic functions with types subject to type 4637 * promotion (i.e. u_char). This is asking for big trouble depending 4638 * on the architecture you are on... 4639 */ 4640 4641 static void 4642 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4643 unsigned int type, unsigned int id, 4644 ...) 4645 { 4646 STDDCL; 4647 struct lcp_header *lh; 4648 struct mbuf *m; 4649 u_char *p; 4650 int len; 4651 size_t pkthdrlen; 4652 unsigned int mlen; 4653 const char *msg; 4654 va_list ap; 4655 4656 MGETHDR(m, M_DONTWAIT, MT_DATA); 4657 if (! m) 4658 return; 4659 m->m_pkthdr.rcvif = 0; 4660 4661 if (sp->pp_flags & PP_NOFRAMING) { 4662 *mtod(m, uint16_t *) = htons(cp->proto); 4663 pkthdrlen = 2; 4664 lh = (struct lcp_header *)(mtod(m, uint8_t *)+2); 4665 } else { 4666 struct ppp_header *h; 4667 h = mtod(m, struct ppp_header *); 4668 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4669 h->control = PPP_UI; /* Unnumbered Info */ 4670 h->protocol = htons(cp->proto); 4671 pkthdrlen = PPP_HEADER_LEN; 4672 4673 lh = (struct lcp_header *)(h + 1); 4674 } 4675 4676 lh->type = type; 4677 lh->ident = id; 4678 p = (u_char *)(lh + 1); 4679 4680 va_start(ap, id); 4681 len = 0; 4682 4683 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4684 msg = va_arg(ap, const char *); 4685 len += mlen; 4686 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4687 va_end(ap); 4688 m_freem(m); 4689 return; 4690 } 4691 4692 memcpy(p, msg, mlen); 4693 p += mlen; 4694 } 4695 va_end(ap); 4696 4697 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4698 lh->len = htons(LCP_HEADER_LEN + len); 4699 4700 if (debug) { 4701 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4702 ifp->if_xname, cp->name, 4703 sppp_auth_type_name(cp->proto, lh->type), 4704 lh->ident, ntohs(lh->len)); 4705 if (len) 4706 sppp_print_bytes((u_char *)(lh + 1), len); 4707 addlog(">\n"); 4708 } 4709 if (IF_QFULL(&sp->pp_cpq)) { 4710 IF_DROP(&sp->pp_fastq); 4711 IF_DROP(&ifp->if_snd); 4712 m_freem(m); 4713 ++ifp->if_oerrors; 4714 return; 4715 } else 4716 IF_ENQUEUE(&sp->pp_cpq, m); 4717 if (! (ifp->if_flags & IFF_OACTIVE)) 4718 (*ifp->if_start)(ifp); 4719 ifp->if_obytes += m->m_pkthdr.len + 3; 4720 } 4721 4722 /* 4723 * Send keepalive packets, every 10 seconds. 4724 */ 4725 static void 4726 sppp_keepalive(void *dummy) 4727 { 4728 struct sppp *sp; 4729 int s; 4730 time_t now; 4731 4732 s = splnet(); 4733 now = time_uptime; 4734 for (sp=spppq; sp; sp=sp->pp_next) { 4735 struct ifnet *ifp = &sp->pp_if; 4736 4737 /* check idle timeout */ 4738 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4739 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4740 /* idle timeout is enabled for this interface */ 4741 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4742 if (ifp->if_flags & IFF_DEBUG) 4743 printf("%s: no activity for %lu seconds\n", 4744 sp->pp_if.if_xname, 4745 (unsigned long)(now-sp->pp_last_activity)); 4746 lcp.Close(sp); 4747 continue; 4748 } 4749 } 4750 4751 /* Keepalive mode disabled or channel down? */ 4752 if (! (sp->pp_flags & PP_KEEPALIVE) || 4753 ! (ifp->if_flags & IFF_RUNNING)) 4754 continue; 4755 4756 /* No keepalive in PPP mode if LCP not opened yet. */ 4757 if (! (sp->pp_flags & PP_CISCO) && 4758 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4759 continue; 4760 4761 /* No echo reply, but maybe user data passed through? */ 4762 if ((now - sp->pp_last_receive) < sp->pp_max_noreceive) { 4763 sp->pp_alivecnt = 0; 4764 continue; 4765 } 4766 4767 if (sp->pp_alivecnt >= sp->pp_maxalive) { 4768 /* No keepalive packets got. Stop the interface. */ 4769 if_down (ifp); 4770 IF_PURGE(&sp->pp_cpq); 4771 if (! (sp->pp_flags & PP_CISCO)) { 4772 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4773 ifp->if_xname); 4774 sp->pp_alivecnt = 0; 4775 4776 /* we are down, close all open protocols */ 4777 lcp.Close(sp); 4778 4779 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4780 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4781 4782 /* Close connection immediately, completition of this 4783 * will summon the magic needed to reestablish it. */ 4784 if (sp->pp_tlf) 4785 sp->pp_tlf(sp); 4786 continue; 4787 } 4788 } 4789 if (sp->pp_alivecnt < sp->pp_maxalive) 4790 ++sp->pp_alivecnt; 4791 if (sp->pp_flags & PP_CISCO) 4792 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4793 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4794 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4795 int32_t nmagic = htonl(sp->lcp.magic); 4796 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4797 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4798 sp->lcp.echoid, 4, &nmagic); 4799 } 4800 } 4801 splx(s); 4802 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4803 } 4804 4805 #ifdef INET 4806 /* 4807 * Get both IP addresses. 4808 */ 4809 static void 4810 sppp_get_ip_addrs(struct sppp *sp, uint32_t *src, uint32_t *dst, uint32_t *srcmask) 4811 { 4812 struct ifnet *ifp = &sp->pp_if; 4813 struct ifaddr *ifa; 4814 struct sockaddr_in *si, *sm; 4815 uint32_t ssrc, ddst; 4816 4817 sm = NULL; 4818 ssrc = ddst = 0; 4819 /* 4820 * Pick the first AF_INET address from the list, 4821 * aliases don't make any sense on a p2p link anyway. 4822 */ 4823 si = 0; 4824 IFADDR_FOREACH(ifa, ifp) { 4825 if (ifa->ifa_addr->sa_family == AF_INET) { 4826 si = (struct sockaddr_in *)ifa->ifa_addr; 4827 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4828 if (si) 4829 break; 4830 } 4831 } 4832 if (ifa) { 4833 if (si && si->sin_addr.s_addr) { 4834 ssrc = si->sin_addr.s_addr; 4835 if (srcmask) 4836 *srcmask = ntohl(sm->sin_addr.s_addr); 4837 } 4838 4839 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4840 if (si && si->sin_addr.s_addr) 4841 ddst = si->sin_addr.s_addr; 4842 } 4843 4844 if (dst) *dst = ntohl(ddst); 4845 if (src) *src = ntohl(ssrc); 4846 } 4847 4848 /* 4849 * Set IP addresses. Must be called at splnet. 4850 * If an address is 0, leave it the way it is. 4851 */ 4852 static void 4853 sppp_set_ip_addrs(struct sppp *sp, uint32_t myaddr, uint32_t hisaddr) 4854 { 4855 STDDCL; 4856 struct ifaddr *ifa; 4857 struct sockaddr_in *si, *dest; 4858 4859 /* 4860 * Pick the first AF_INET address from the list, 4861 * aliases don't make any sense on a p2p link anyway. 4862 */ 4863 4864 IFADDR_FOREACH(ifa, ifp) { 4865 if (ifa->ifa_addr->sa_family == AF_INET) { 4866 si = (struct sockaddr_in *)ifa->ifa_addr; 4867 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4868 goto found; 4869 } 4870 } 4871 return; 4872 4873 found: 4874 { 4875 int error; 4876 struct sockaddr_in new_sin = *si; 4877 struct sockaddr_in new_dst = *dest; 4878 4879 /* 4880 * Scrub old routes now instead of calling in_ifinit with 4881 * scrub=1, because we may change the dstaddr 4882 * before the call to in_ifinit. 4883 */ 4884 in_ifscrub(ifp, ifatoia(ifa)); 4885 4886 if (myaddr != 0) 4887 new_sin.sin_addr.s_addr = htonl(myaddr); 4888 if (hisaddr != 0) { 4889 new_dst.sin_addr.s_addr = htonl(hisaddr); 4890 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4891 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4892 *dest = new_dst; /* fix dstaddr in place */ 4893 } 4894 } 4895 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4896 if (debug && error) 4897 { 4898 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4899 " failed, error=%d\n", ifp->if_xname, error); 4900 } 4901 if (!error) { 4902 (void)pfil_run_hooks(if_pfil, 4903 (struct mbuf **)SIOCAIFADDR, ifp, PFIL_IFADDR); 4904 } 4905 } 4906 } 4907 4908 /* 4909 * Clear IP addresses. Must be called at splnet. 4910 */ 4911 static void 4912 sppp_clear_ip_addrs(struct sppp *sp) 4913 { 4914 struct ifnet *ifp = &sp->pp_if; 4915 struct ifaddr *ifa; 4916 struct sockaddr_in *si, *dest; 4917 4918 uint32_t remote; 4919 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4920 remote = sp->ipcp.saved_hisaddr; 4921 else 4922 sppp_get_ip_addrs(sp, 0, &remote, 0); 4923 4924 /* 4925 * Pick the first AF_INET address from the list, 4926 * aliases don't make any sense on a p2p link anyway. 4927 */ 4928 4929 IFADDR_FOREACH(ifa, ifp) { 4930 if (ifa->ifa_addr->sa_family == AF_INET) { 4931 si = (struct sockaddr_in *)ifa->ifa_addr; 4932 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4933 goto found; 4934 } 4935 } 4936 return; 4937 4938 found: 4939 { 4940 struct sockaddr_in new_sin = *si; 4941 4942 in_ifscrub(ifp, ifatoia(ifa)); 4943 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4944 new_sin.sin_addr.s_addr = 0; 4945 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4946 /* replace peer addr in place */ 4947 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4948 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4949 (void)pfil_run_hooks(if_pfil, 4950 (struct mbuf **)SIOCDIFADDR, ifp, PFIL_IFADDR); 4951 } 4952 } 4953 #endif 4954 4955 #ifdef INET6 4956 /* 4957 * Get both IPv6 addresses. 4958 */ 4959 static void 4960 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4961 struct in6_addr *srcmask) 4962 { 4963 struct ifnet *ifp = &sp->pp_if; 4964 struct ifaddr *ifa; 4965 struct sockaddr_in6 *si, *sm; 4966 struct in6_addr ssrc, ddst; 4967 4968 sm = NULL; 4969 memset(&ssrc, 0, sizeof(ssrc)); 4970 memset(&ddst, 0, sizeof(ddst)); 4971 /* 4972 * Pick the first link-local AF_INET6 address from the list, 4973 * aliases don't make any sense on a p2p link anyway. 4974 */ 4975 si = 0; 4976 IFADDR_FOREACH(ifa, ifp) 4977 if (ifa->ifa_addr->sa_family == AF_INET6) { 4978 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4979 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4980 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4981 break; 4982 } 4983 if (ifa) { 4984 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4985 memcpy(&ssrc, &si->sin6_addr, sizeof(ssrc)); 4986 if (srcmask) { 4987 memcpy(srcmask, &sm->sin6_addr, 4988 sizeof(*srcmask)); 4989 } 4990 } 4991 4992 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4993 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4994 memcpy(&ddst, &si->sin6_addr, sizeof(ddst)); 4995 } 4996 4997 if (dst) 4998 memcpy(dst, &ddst, sizeof(*dst)); 4999 if (src) 5000 memcpy(src, &ssrc, sizeof(*src)); 5001 } 5002 5003 #ifdef IPV6CP_MYIFID_DYN 5004 /* 5005 * Generate random ifid. 5006 */ 5007 static void 5008 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5009 { 5010 /* TBD */ 5011 } 5012 5013 /* 5014 * Set my IPv6 address. Must be called at splnet. 5015 */ 5016 static void 5017 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5018 { 5019 STDDCL; 5020 struct ifaddr *ifa; 5021 struct sockaddr_in6 *sin6; 5022 5023 /* 5024 * Pick the first link-local AF_INET6 address from the list, 5025 * aliases don't make any sense on a p2p link anyway. 5026 */ 5027 5028 sin6 = NULL; 5029 IFADDR_FOREACH(ifa, ifp) 5030 { 5031 if (ifa->ifa_addr->sa_family == AF_INET6) 5032 { 5033 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5034 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5035 break; 5036 } 5037 } 5038 5039 if (ifa && sin6) 5040 { 5041 int error; 5042 struct sockaddr_in6 new_sin6 = *sin6; 5043 5044 memcpy(&new_sin6.sin6_addr, src, sizeof(new_sin6.sin6_addr)); 5045 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5046 if (debug && error) 5047 { 5048 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 5049 " failed, error=%d\n", ifp->if_xname, error); 5050 } 5051 if (!error) { 5052 (void)pfil_run_hooks(if_pfil, 5053 (struct mbuf **)SIOCAIFADDR_IN6, ifp, PFIL_IFADDR); 5054 } 5055 } 5056 } 5057 #endif 5058 5059 /* 5060 * Suggest a candidate address to be used by peer. 5061 */ 5062 static void 5063 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5064 { 5065 struct in6_addr myaddr; 5066 struct timeval tv; 5067 5068 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5069 5070 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5071 microtime(&tv); 5072 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5073 myaddr.s6_addr[14] ^= 0xff; 5074 myaddr.s6_addr[15] ^= 0xff; 5075 } else { 5076 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5077 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5078 } 5079 if (suggest) 5080 memcpy(suggest, &myaddr, sizeof(myaddr)); 5081 } 5082 #endif /*INET6*/ 5083 5084 /* 5085 * Process ioctl requests specific to the PPP interface. 5086 * Permissions have already been checked. 5087 */ 5088 static int 5089 sppp_params(struct sppp *sp, u_long cmd, void *data) 5090 { 5091 switch (cmd) { 5092 case SPPPGETAUTHCFG: 5093 { 5094 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5095 int error; 5096 size_t len; 5097 5098 cfg->myauthflags = sp->myauth.flags; 5099 cfg->hisauthflags = sp->hisauth.flags; 5100 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5101 cfg->hisauth = 0; 5102 if (sp->hisauth.proto) 5103 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5104 cfg->myauth = 0; 5105 if (sp->myauth.proto) 5106 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5107 if (cfg->myname_length == 0) { 5108 if (sp->myauth.name != NULL) 5109 cfg->myname_length = sp->myauth.name_len + 1; 5110 } else { 5111 if (sp->myauth.name == NULL) { 5112 cfg->myname_length = 0; 5113 } else { 5114 len = sp->myauth.name_len + 1; 5115 if (cfg->myname_length < len) 5116 return (ENAMETOOLONG); 5117 error = copyout(sp->myauth.name, cfg->myname, len); 5118 if (error) return error; 5119 } 5120 } 5121 if (cfg->hisname_length == 0) { 5122 if (sp->hisauth.name != NULL) 5123 cfg->hisname_length = sp->hisauth.name_len + 1; 5124 } else { 5125 if (sp->hisauth.name == NULL) { 5126 cfg->hisname_length = 0; 5127 } else { 5128 len = sp->hisauth.name_len + 1; 5129 if (cfg->hisname_length < len) 5130 return (ENAMETOOLONG); 5131 error = copyout(sp->hisauth.name, cfg->hisname, len); 5132 if (error) return error; 5133 } 5134 } 5135 } 5136 break; 5137 case SPPPSETAUTHCFG: 5138 { 5139 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5140 int error; 5141 5142 if (sp->myauth.name) { 5143 free(sp->myauth.name, M_DEVBUF); 5144 sp->myauth.name = NULL; 5145 } 5146 if (sp->myauth.secret) { 5147 free(sp->myauth.secret, M_DEVBUF); 5148 sp->myauth.secret = NULL; 5149 } 5150 if (sp->hisauth.name) { 5151 free(sp->hisauth.name, M_DEVBUF); 5152 sp->hisauth.name = NULL; 5153 } 5154 if (sp->hisauth.secret) { 5155 free(sp->hisauth.secret, M_DEVBUF); 5156 sp->hisauth.secret = NULL; 5157 } 5158 5159 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5160 if (cfg->hisname_length >= MCLBYTES) 5161 return (ENAMETOOLONG); 5162 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5163 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5164 if (error) { 5165 free(sp->hisauth.name, M_DEVBUF); 5166 sp->hisauth.name = NULL; 5167 return error; 5168 } 5169 sp->hisauth.name_len = cfg->hisname_length - 1; 5170 sp->hisauth.name[sp->hisauth.name_len] = 0; 5171 } 5172 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5173 if (cfg->hissecret_length >= MCLBYTES) 5174 return (ENAMETOOLONG); 5175 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5176 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5177 if (error) { 5178 free(sp->hisauth.secret, M_DEVBUF); 5179 sp->hisauth.secret = NULL; 5180 return error; 5181 } 5182 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5183 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5184 } 5185 if (cfg->myname != NULL && cfg->myname_length > 0) { 5186 if (cfg->myname_length >= MCLBYTES) 5187 return (ENAMETOOLONG); 5188 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5189 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5190 if (error) { 5191 free(sp->myauth.name, M_DEVBUF); 5192 sp->myauth.name = NULL; 5193 return error; 5194 } 5195 sp->myauth.name_len = cfg->myname_length - 1; 5196 sp->myauth.name[sp->myauth.name_len] = 0; 5197 } 5198 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5199 if (cfg->mysecret_length >= MCLBYTES) 5200 return (ENAMETOOLONG); 5201 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5202 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5203 if (error) { 5204 free(sp->myauth.secret, M_DEVBUF); 5205 sp->myauth.secret = NULL; 5206 return error; 5207 } 5208 sp->myauth.secret_len = cfg->mysecret_length - 1; 5209 sp->myauth.secret[sp->myauth.secret_len] = 0; 5210 } 5211 sp->myauth.flags = cfg->myauthflags; 5212 if (cfg->myauth) 5213 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5214 sp->hisauth.flags = cfg->hisauthflags; 5215 if (cfg->hisauth) 5216 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5217 sp->pp_auth_failures = 0; 5218 if (sp->hisauth.proto != 0) 5219 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5220 else 5221 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5222 } 5223 break; 5224 case SPPPGETLCPCFG: 5225 { 5226 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5227 lcpp->lcp_timeout = sp->lcp.timeout; 5228 } 5229 break; 5230 case SPPPSETLCPCFG: 5231 { 5232 struct sppplcpcfg *lcpp = (struct sppplcpcfg *)data; 5233 sp->lcp.timeout = lcpp->lcp_timeout; 5234 } 5235 break; 5236 case SPPPGETSTATUS: 5237 { 5238 struct spppstatus *status = (struct spppstatus *)data; 5239 status->phase = sp->pp_phase; 5240 } 5241 break; 5242 case SPPPGETSTATUSNCP: 5243 { 5244 struct spppstatusncp *status = (struct spppstatusncp *)data; 5245 status->phase = sp->pp_phase; 5246 status->ncpup = sppp_ncp_check(sp); 5247 } 5248 break; 5249 case SPPPGETIDLETO: 5250 { 5251 struct spppidletimeout *to = (struct spppidletimeout *)data; 5252 to->idle_seconds = sp->pp_idle_timeout; 5253 } 5254 break; 5255 case SPPPSETIDLETO: 5256 { 5257 struct spppidletimeout *to = (struct spppidletimeout *)data; 5258 sp->pp_idle_timeout = to->idle_seconds; 5259 } 5260 break; 5261 case SPPPSETAUTHFAILURE: 5262 { 5263 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5264 sp->pp_max_auth_fail = afsettings->max_failures; 5265 sp->pp_auth_failures = 0; 5266 } 5267 break; 5268 case SPPPGETAUTHFAILURES: 5269 { 5270 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5271 stats->auth_failures = sp->pp_auth_failures; 5272 stats->max_failures = sp->pp_max_auth_fail; 5273 } 5274 break; 5275 case SPPPSETDNSOPTS: 5276 { 5277 struct spppdnssettings *req = (struct spppdnssettings *)data; 5278 sp->query_dns = req->query_dns & 3; 5279 } 5280 break; 5281 case SPPPGETDNSOPTS: 5282 { 5283 struct spppdnssettings *req = (struct spppdnssettings *)data; 5284 req->query_dns = sp->query_dns; 5285 } 5286 break; 5287 case SPPPGETDNSADDRS: 5288 { 5289 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5290 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5291 } 5292 break; 5293 case SPPPGETKEEPALIVE: 5294 { 5295 struct spppkeepalivesettings *settings = 5296 (struct spppkeepalivesettings*)data; 5297 settings->maxalive = sp->pp_maxalive; 5298 settings->max_noreceive = sp->pp_max_noreceive; 5299 } 5300 break; 5301 case SPPPSETKEEPALIVE: 5302 { 5303 struct spppkeepalivesettings *settings = 5304 (struct spppkeepalivesettings*)data; 5305 sp->pp_maxalive = settings->maxalive; 5306 sp->pp_max_noreceive = settings->max_noreceive; 5307 } 5308 break; 5309 #if defined(COMPAT_50) || defined(MODULAR) 5310 case __SPPPGETIDLETO50: 5311 { 5312 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5313 to->idle_seconds = (uint32_t)sp->pp_idle_timeout; 5314 } 5315 break; 5316 case __SPPPSETIDLETO50: 5317 { 5318 struct spppidletimeout50 *to = (struct spppidletimeout50 *)data; 5319 sp->pp_idle_timeout = (time_t)to->idle_seconds; 5320 } 5321 break; 5322 case __SPPPGETKEEPALIVE50: 5323 { 5324 struct spppkeepalivesettings50 *settings = 5325 (struct spppkeepalivesettings50*)data; 5326 settings->maxalive = sp->pp_maxalive; 5327 settings->max_noreceive = (uint32_t)sp->pp_max_noreceive; 5328 } 5329 break; 5330 case __SPPPSETKEEPALIVE50: 5331 { 5332 struct spppkeepalivesettings50 *settings = 5333 (struct spppkeepalivesettings50*)data; 5334 sp->pp_maxalive = settings->maxalive; 5335 sp->pp_max_noreceive = (time_t)settings->max_noreceive; 5336 } 5337 break; 5338 #endif /* COMPAT_50 || MODULAR */ 5339 default: 5340 return (EINVAL); 5341 } 5342 5343 return (0); 5344 } 5345 5346 static void 5347 sppp_phase_network(struct sppp *sp) 5348 { 5349 STDDCL; 5350 int i; 5351 uint32_t mask; 5352 5353 sp->pp_phase = SPPP_PHASE_NETWORK; 5354 5355 if (debug) 5356 { 5357 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5358 sppp_phase_name(sp->pp_phase)); 5359 } 5360 5361 /* Notify NCPs now. */ 5362 for (i = 0; i < IDX_COUNT; i++) 5363 if ((cps[i])->flags & CP_NCP) 5364 (cps[i])->Open(sp); 5365 5366 /* Send Up events to all NCPs. */ 5367 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5368 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5369 (cps[i])->Up(sp); 5370 5371 /* if no NCP is starting, all this was in vain, close down */ 5372 sppp_lcp_check_and_close(sp); 5373 } 5374 5375 5376 static const char * 5377 sppp_cp_type_name(u_char type) 5378 { 5379 static char buf[12]; 5380 switch (type) { 5381 case CONF_REQ: return "conf-req"; 5382 case CONF_ACK: return "conf-ack"; 5383 case CONF_NAK: return "conf-nak"; 5384 case CONF_REJ: return "conf-rej"; 5385 case TERM_REQ: return "term-req"; 5386 case TERM_ACK: return "term-ack"; 5387 case CODE_REJ: return "code-rej"; 5388 case PROTO_REJ: return "proto-rej"; 5389 case ECHO_REQ: return "echo-req"; 5390 case ECHO_REPLY: return "echo-reply"; 5391 case DISC_REQ: return "discard-req"; 5392 } 5393 snprintf(buf, sizeof(buf), "0x%x", type); 5394 return buf; 5395 } 5396 5397 static const char * 5398 sppp_auth_type_name(u_short proto, u_char type) 5399 { 5400 static char buf[12]; 5401 switch (proto) { 5402 case PPP_CHAP: 5403 switch (type) { 5404 case CHAP_CHALLENGE: return "challenge"; 5405 case CHAP_RESPONSE: return "response"; 5406 case CHAP_SUCCESS: return "success"; 5407 case CHAP_FAILURE: return "failure"; 5408 } 5409 case PPP_PAP: 5410 switch (type) { 5411 case PAP_REQ: return "req"; 5412 case PAP_ACK: return "ack"; 5413 case PAP_NAK: return "nak"; 5414 } 5415 } 5416 snprintf(buf, sizeof(buf), "0x%x", type); 5417 return buf; 5418 } 5419 5420 static const char * 5421 sppp_lcp_opt_name(u_char opt) 5422 { 5423 static char buf[12]; 5424 switch (opt) { 5425 case LCP_OPT_MRU: return "mru"; 5426 case LCP_OPT_ASYNC_MAP: return "async-map"; 5427 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5428 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5429 case LCP_OPT_MAGIC: return "magic"; 5430 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5431 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5432 } 5433 snprintf(buf, sizeof(buf), "0x%x", opt); 5434 return buf; 5435 } 5436 5437 static const char * 5438 sppp_ipcp_opt_name(u_char opt) 5439 { 5440 static char buf[12]; 5441 switch (opt) { 5442 case IPCP_OPT_ADDRESSES: return "addresses"; 5443 case IPCP_OPT_COMPRESSION: return "compression"; 5444 case IPCP_OPT_ADDRESS: return "address"; 5445 } 5446 snprintf(buf, sizeof(buf), "0x%x", opt); 5447 return buf; 5448 } 5449 5450 #ifdef INET6 5451 static const char * 5452 sppp_ipv6cp_opt_name(u_char opt) 5453 { 5454 static char buf[12]; 5455 switch (opt) { 5456 case IPV6CP_OPT_IFID: return "ifid"; 5457 case IPV6CP_OPT_COMPRESSION: return "compression"; 5458 } 5459 snprintf(buf, sizeof(buf), "0x%x", opt); 5460 return buf; 5461 } 5462 #endif 5463 5464 static const char * 5465 sppp_state_name(int state) 5466 { 5467 switch (state) { 5468 case STATE_INITIAL: return "initial"; 5469 case STATE_STARTING: return "starting"; 5470 case STATE_CLOSED: return "closed"; 5471 case STATE_STOPPED: return "stopped"; 5472 case STATE_CLOSING: return "closing"; 5473 case STATE_STOPPING: return "stopping"; 5474 case STATE_REQ_SENT: return "req-sent"; 5475 case STATE_ACK_RCVD: return "ack-rcvd"; 5476 case STATE_ACK_SENT: return "ack-sent"; 5477 case STATE_OPENED: return "opened"; 5478 } 5479 return "illegal"; 5480 } 5481 5482 static const char * 5483 sppp_phase_name(int phase) 5484 { 5485 switch (phase) { 5486 case SPPP_PHASE_DEAD: return "dead"; 5487 case SPPP_PHASE_ESTABLISH: return "establish"; 5488 case SPPP_PHASE_TERMINATE: return "terminate"; 5489 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5490 case SPPP_PHASE_NETWORK: return "network"; 5491 } 5492 return "illegal"; 5493 } 5494 5495 static const char * 5496 sppp_proto_name(u_short proto) 5497 { 5498 static char buf[12]; 5499 switch (proto) { 5500 case PPP_LCP: return "lcp"; 5501 case PPP_IPCP: return "ipcp"; 5502 case PPP_PAP: return "pap"; 5503 case PPP_CHAP: return "chap"; 5504 case PPP_IPV6CP: return "ipv6cp"; 5505 } 5506 snprintf(buf, sizeof(buf), "0x%x", (unsigned)proto); 5507 return buf; 5508 } 5509 5510 static void 5511 sppp_print_bytes(const u_char *p, u_short len) 5512 { 5513 addlog(" %02x", *p++); 5514 while (--len > 0) 5515 addlog("-%02x", *p++); 5516 } 5517 5518 static void 5519 sppp_print_string(const char *p, u_short len) 5520 { 5521 u_char c; 5522 5523 while (len-- > 0) { 5524 c = *p++; 5525 /* 5526 * Print only ASCII chars directly. RFC 1994 recommends 5527 * using only them, but we don't rely on it. */ 5528 if (c < ' ' || c > '~') 5529 addlog("\\x%x", c); 5530 else 5531 addlog("%c", c); 5532 } 5533 } 5534 5535 static const char * 5536 sppp_dotted_quad(uint32_t addr) 5537 { 5538 static char s[16]; 5539 snprintf(s, sizeof(s), "%d.%d.%d.%d", 5540 (int)((addr >> 24) & 0xff), 5541 (int)((addr >> 16) & 0xff), 5542 (int)((addr >> 8) & 0xff), 5543 (int)(addr & 0xff)); 5544 return s; 5545 } 5546 5547 /* a dummy, used to drop uninteresting events */ 5548 static void 5549 sppp_null(struct sppp *unused) 5550 { 5551 /* do just nothing */ 5552 } 5553 /* 5554 * This file is large. Tell emacs to highlight it nevertheless. 5555 * 5556 * Local Variables: 5557 * hilit-auto-highlight-maxout: 120000 5558 * End: 5559 */ 5560
Indexes created Tue Oct 14 11:09:46 GMT 2025