if_spppsubr.c revision 1.66
1 /* $NetBSD: if_spppsubr.c,v 1.66 2003/05/23 10:06:18 itojun 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 1.66 2003/05/23 10:06:18 itojun Exp $"); 45 46 #include "opt_inet.h" 47 #include "opt_ipx.h" 48 #include "opt_iso.h" 49 #include "opt_ns.h" 50 51 #include <sys/param.h> 52 #include <sys/proc.h> 53 #include <sys/systm.h> 54 #include <sys/kernel.h> 55 #include <sys/sockio.h> 56 #include <sys/socket.h> 57 #include <sys/syslog.h> 58 #include <sys/malloc.h> 59 #include <sys/mbuf.h> 60 #include <sys/callout.h> 61 #include <sys/md5.h> 62 #include <sys/inttypes.h> 63 64 #include <net/if.h> 65 #include <net/netisr.h> 66 #include <net/if_types.h> 67 #include <net/route.h> 68 #include <net/ppp_defs.h> 69 70 #include <machine/stdarg.h> 71 72 #include <netinet/in.h> 73 #include <netinet/in_systm.h> 74 #include <netinet/in_var.h> 75 #ifdef INET 76 #include <netinet/ip.h> 77 #include <netinet/tcp.h> 78 #endif 79 #include <net/ethertypes.h> 80 81 #ifdef IPX 82 #include <netipx/ipx.h> 83 #include <netipx/ipx_if.h> 84 #endif 85 86 #ifdef NS 87 #include <netns/ns.h> 88 #include <netns/ns_if.h> 89 #endif 90 91 #ifdef ISO 92 #include <netiso/argo_debug.h> 93 #include <netiso/iso.h> 94 #include <netiso/iso_var.h> 95 #include <netiso/iso_snpac.h> 96 #endif 97 98 #include <net/if_sppp.h> 99 #include <net/if_spppvar.h> 100 101 #define LCP_KEEPALIVE_INTERVAL 10 /* seconds */ 102 #define MAXALIVECNT 3 /* max. missed alive packets */ 103 #define DEFAULT_MAX_AUTH_FAILURES 5 /* max. auth. failures */ 104 105 /* 106 * Interface flags that can be set in an ifconfig command. 107 * 108 * Setting link0 will make the link passive, i.e. it will be marked 109 * as being administrative openable, but won't be opened to begin 110 * with. Incoming calls will be answered, or subsequent calls with 111 * -link1 will cause the administrative open of the LCP layer. 112 * 113 * Setting link1 will cause the link to auto-dial only as packets 114 * arrive to be sent. 115 * 116 * Setting IFF_DEBUG will syslog the option negotiation and state 117 * transitions at level kern.debug. Note: all logs consistently look 118 * like 119 * 120 * <if-name><unit>: <proto-name> <additional info...> 121 * 122 * with <if-name><unit> being something like "bppp0", and <proto-name> 123 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 124 */ 125 126 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 127 #define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 128 129 #define CONF_REQ 1 /* PPP configure request */ 130 #define CONF_ACK 2 /* PPP configure acknowledge */ 131 #define CONF_NAK 3 /* PPP configure negative ack */ 132 #define CONF_REJ 4 /* PPP configure reject */ 133 #define TERM_REQ 5 /* PPP terminate request */ 134 #define TERM_ACK 6 /* PPP terminate acknowledge */ 135 #define CODE_REJ 7 /* PPP code reject */ 136 #define PROTO_REJ 8 /* PPP protocol reject */ 137 #define ECHO_REQ 9 /* PPP echo request */ 138 #define ECHO_REPLY 10 /* PPP echo reply */ 139 #define DISC_REQ 11 /* PPP discard request */ 140 141 #define LCP_OPT_MRU 1 /* maximum receive unit */ 142 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 143 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 144 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 145 #define LCP_OPT_MAGIC 5 /* magic number */ 146 #define LCP_OPT_RESERVED 6 /* reserved */ 147 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 148 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 149 150 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 151 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol */ 152 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 153 #define IPCP_OPT_PRIMDNS 129 /* primary remote dns address */ 154 #define IPCP_OPT_SECDNS 131 /* secondary remote dns address */ 155 156 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 157 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 158 159 #define PAP_REQ 1 /* PAP name/password request */ 160 #define PAP_ACK 2 /* PAP acknowledge */ 161 #define PAP_NAK 3 /* PAP fail */ 162 163 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 164 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 165 #define CHAP_SUCCESS 3 /* CHAP response ok */ 166 #define CHAP_FAILURE 4 /* CHAP response failed */ 167 168 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 169 170 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 171 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 172 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 173 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 174 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 175 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 176 177 /* states are named and numbered according to RFC 1661 */ 178 #define STATE_INITIAL 0 179 #define STATE_STARTING 1 180 #define STATE_CLOSED 2 181 #define STATE_STOPPED 3 182 #define STATE_CLOSING 4 183 #define STATE_STOPPING 5 184 #define STATE_REQ_SENT 6 185 #define STATE_ACK_RCVD 7 186 #define STATE_ACK_SENT 8 187 #define STATE_OPENED 9 188 189 struct ppp_header { 190 u_char address; 191 u_char control; 192 u_short protocol; 193 } __attribute__((__packed__)); 194 #define PPP_HEADER_LEN sizeof (struct ppp_header) 195 196 struct lcp_header { 197 u_char type; 198 u_char ident; 199 u_short len; 200 } __attribute__((__packed__)); 201 #define LCP_HEADER_LEN sizeof (struct lcp_header) 202 203 struct cisco_packet { 204 u_int32_t type; 205 u_int32_t par1; 206 u_int32_t par2; 207 u_short rel; 208 u_short time0; 209 u_short time1; 210 } __attribute__((__packed__)); 211 #define CISCO_PACKET_LEN 18 212 213 /* 214 * We follow the spelling and capitalization of RFC 1661 here, to make 215 * it easier comparing with the standard. Please refer to this RFC in 216 * case you can't make sense out of these abbreviation; it will also 217 * explain the semantics related to the various events and actions. 218 */ 219 struct cp { 220 u_short proto; /* PPP control protocol number */ 221 u_char protoidx; /* index into state table in struct sppp */ 222 u_char flags; 223 #define CP_LCP 0x01 /* this is the LCP */ 224 #define CP_AUTH 0x02 /* this is an authentication protocol */ 225 #define CP_NCP 0x04 /* this is a NCP */ 226 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 227 const char *name; /* name of this control protocol */ 228 /* event handlers */ 229 void (*Up)(struct sppp *sp); 230 void (*Down)(struct sppp *sp); 231 void (*Open)(struct sppp *sp); 232 void (*Close)(struct sppp *sp); 233 void (*TO)(void *sp); 234 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 235 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 236 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 237 /* actions */ 238 void (*tlu)(struct sppp *sp); 239 void (*tld)(struct sppp *sp); 240 void (*tls)(struct sppp *sp); 241 void (*tlf)(struct sppp *sp); 242 void (*scr)(struct sppp *sp); 243 }; 244 245 static struct sppp *spppq; 246 static struct callout keepalive_ch; 247 248 #ifdef INET 249 /* 250 * The following disgusting hack gets around the problem that IP TOS 251 * can't be set yet. We want to put "interactive" traffic on a high 252 * priority queue. To decide if traffic is interactive, we check that 253 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 254 * 255 * XXX is this really still necessary? - joerg - 256 */ 257 static u_short interactive_ports[8] = { 258 0, 513, 0, 0, 259 0, 21, 0, 23, 260 }; 261 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 262 #endif 263 264 /* almost every function needs these */ 265 #define STDDCL \ 266 struct ifnet *ifp = &sp->pp_if; \ 267 int debug = ifp->if_flags & IFF_DEBUG 268 269 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 270 struct sockaddr *dst, struct rtentry *rt); 271 272 static void sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2); 273 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 274 275 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 276 struct mbuf *m); 277 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 278 u_char ident, u_short len, void *data); 279 /* static void sppp_cp_timeout(void *arg); */ 280 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 281 int newstate); 282 static void sppp_auth_send(const struct cp *cp, 283 struct sppp *sp, unsigned int type, unsigned int id, 284 ...); 285 286 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 287 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 288 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 289 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 290 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 291 292 static void sppp_null(struct sppp *sp); 293 294 static void sppp_lcp_init(struct sppp *sp); 295 static void sppp_lcp_up(struct sppp *sp); 296 static void sppp_lcp_down(struct sppp *sp); 297 static void sppp_lcp_open(struct sppp *sp); 298 static void sppp_lcp_close(struct sppp *sp); 299 static void sppp_lcp_TO(void *sp); 300 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 301 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 302 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 303 static void sppp_lcp_tlu(struct sppp *sp); 304 static void sppp_lcp_tld(struct sppp *sp); 305 static void sppp_lcp_tls(struct sppp *sp); 306 static void sppp_lcp_tlf(struct sppp *sp); 307 static void sppp_lcp_scr(struct sppp *sp); 308 static void sppp_lcp_check_and_close(struct sppp *sp); 309 static int sppp_ncp_check(struct sppp *sp); 310 311 static void sppp_ipcp_init(struct sppp *sp); 312 static void sppp_ipcp_up(struct sppp *sp); 313 static void sppp_ipcp_down(struct sppp *sp); 314 static void sppp_ipcp_open(struct sppp *sp); 315 static void sppp_ipcp_close(struct sppp *sp); 316 static void sppp_ipcp_TO(void *sp); 317 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 318 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 319 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 320 static void sppp_ipcp_tlu(struct sppp *sp); 321 static void sppp_ipcp_tld(struct sppp *sp); 322 static void sppp_ipcp_tls(struct sppp *sp); 323 static void sppp_ipcp_tlf(struct sppp *sp); 324 static void sppp_ipcp_scr(struct sppp *sp); 325 326 static void sppp_ipv6cp_init(struct sppp *sp); 327 static void sppp_ipv6cp_up(struct sppp *sp); 328 static void sppp_ipv6cp_down(struct sppp *sp); 329 static void sppp_ipv6cp_open(struct sppp *sp); 330 static void sppp_ipv6cp_close(struct sppp *sp); 331 static void sppp_ipv6cp_TO(void *sp); 332 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 333 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 334 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 335 static void sppp_ipv6cp_tlu(struct sppp *sp); 336 static void sppp_ipv6cp_tld(struct sppp *sp); 337 static void sppp_ipv6cp_tls(struct sppp *sp); 338 static void sppp_ipv6cp_tlf(struct sppp *sp); 339 static void sppp_ipv6cp_scr(struct sppp *sp); 340 341 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 342 static void sppp_pap_init(struct sppp *sp); 343 static void sppp_pap_open(struct sppp *sp); 344 static void sppp_pap_close(struct sppp *sp); 345 static void sppp_pap_TO(void *sp); 346 static void sppp_pap_my_TO(void *sp); 347 static void sppp_pap_tlu(struct sppp *sp); 348 static void sppp_pap_tld(struct sppp *sp); 349 static void sppp_pap_scr(struct sppp *sp); 350 351 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 352 static void sppp_chap_init(struct sppp *sp); 353 static void sppp_chap_open(struct sppp *sp); 354 static void sppp_chap_close(struct sppp *sp); 355 static void sppp_chap_TO(void *sp); 356 static void sppp_chap_tlu(struct sppp *sp); 357 static void sppp_chap_tld(struct sppp *sp); 358 static void sppp_chap_scr(struct sppp *sp); 359 360 static const char *sppp_auth_type_name(u_short proto, u_char type); 361 static const char *sppp_cp_type_name(u_char type); 362 static const char *sppp_dotted_quad(u_int32_t addr); 363 static const char *sppp_ipcp_opt_name(u_char opt); 364 #ifdef INET6 365 static const char *sppp_ipv6cp_opt_name(u_char opt); 366 #endif 367 static const char *sppp_lcp_opt_name(u_char opt); 368 static const char *sppp_phase_name(int phase); 369 static const char *sppp_proto_name(u_short proto); 370 static const char *sppp_state_name(int state); 371 static int sppp_params(struct sppp *sp, int cmd, void *data); 372 static void sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, 373 u_int32_t *srcmask); 374 static void sppp_keepalive(void *dummy); 375 static void sppp_phase_network(struct sppp *sp); 376 static void sppp_print_bytes(const u_char *p, u_short len); 377 static void sppp_print_string(const char *p, u_short len); 378 static void sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr); 379 static void sppp_clear_ip_addrs(struct sppp *sp); 380 #ifdef INET6 381 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 382 struct in6_addr *dst, struct in6_addr *srcmask); 383 #ifdef IPV6CP_MYIFID_DYN 384 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 385 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 386 #endif 387 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 388 #endif 389 390 /* our control protocol descriptors */ 391 static const struct cp lcp = { 392 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 393 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 394 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 395 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 396 sppp_lcp_scr 397 }; 398 399 static const struct cp ipcp = { 400 PPP_IPCP, IDX_IPCP, 401 #ifdef INET 402 CP_NCP, /*don't run IPCP if there's no IPv4 support*/ 403 #else 404 0, 405 #endif 406 "ipcp", 407 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 408 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 409 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 410 sppp_ipcp_scr 411 }; 412 413 static const struct cp ipv6cp = { 414 PPP_IPV6CP, IDX_IPV6CP, 415 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 416 CP_NCP, 417 #else 418 0, 419 #endif 420 "ipv6cp", 421 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 422 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 423 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 424 sppp_ipv6cp_scr 425 }; 426 427 static const struct cp pap = { 428 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 429 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 430 sppp_pap_TO, 0, 0, 0, 431 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 432 sppp_pap_scr 433 }; 434 435 static const struct cp chap = { 436 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 437 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 438 sppp_chap_TO, 0, 0, 0, 439 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 440 sppp_chap_scr 441 }; 442 443 static const struct cp *cps[IDX_COUNT] = { 444 &lcp, /* IDX_LCP */ 445 &ipcp, /* IDX_IPCP */ 446 &ipv6cp, /* IDX_IPV6CP */ 447 &pap, /* IDX_PAP */ 448 &chap, /* IDX_CHAP */ 449 }; 450 451 452 /* 453 * Exported functions, comprising our interface to the lower layer. 454 */ 455 456 /* 457 * Process the received packet. 458 */ 459 void 460 sppp_input(struct ifnet *ifp, struct mbuf *m) 461 { 462 struct ppp_header *h = NULL; 463 struct ifqueue *inq = 0; 464 u_int16_t protocol; 465 int s; 466 struct sppp *sp = (struct sppp *)ifp; 467 int debug = ifp->if_flags & IFF_DEBUG; 468 469 if (ifp->if_flags & IFF_UP) 470 /* Count received bytes, add hardware framing */ 471 ifp->if_ibytes += m->m_pkthdr.len + sp->pp_framebytes; 472 473 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 474 /* Too small packet, drop it. */ 475 if (debug) 476 log(LOG_DEBUG, 477 "%s: input packet is too small, %d bytes\n", 478 ifp->if_xname, m->m_pkthdr.len); 479 drop: 480 ++ifp->if_ierrors; 481 ++ifp->if_iqdrops; 482 m_freem(m); 483 return; 484 } 485 486 if (sp->pp_flags & PP_NOFRAMING) { 487 memcpy(&protocol, mtod(m, void *), 2); 488 protocol = ntohs(protocol); 489 m_adj(m, 2); 490 } else { 491 492 /* Get PPP header. */ 493 h = mtod(m, struct ppp_header *); 494 m_adj(m, PPP_HEADER_LEN); 495 496 switch (h->address) { 497 case PPP_ALLSTATIONS: 498 if (h->control != PPP_UI) 499 goto invalid; 500 if (sp->pp_flags & PP_CISCO) { 501 if (debug) 502 log(LOG_DEBUG, 503 "%s: PPP packet in Cisco mode " 504 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 505 ifp->if_xname, 506 h->address, h->control, ntohs(h->protocol)); 507 goto drop; 508 } 509 break; 510 case CISCO_MULTICAST: 511 case CISCO_UNICAST: 512 /* Don't check the control field here (RFC 1547). */ 513 if (! (sp->pp_flags & PP_CISCO)) { 514 if (debug) 515 log(LOG_DEBUG, 516 "%s: Cisco packet in PPP mode " 517 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 518 ifp->if_xname, 519 h->address, h->control, ntohs(h->protocol)); 520 goto drop; 521 } 522 switch (ntohs(h->protocol)) { 523 default: 524 ++ifp->if_noproto; 525 goto invalid; 526 case CISCO_KEEPALIVE: 527 sppp_cisco_input((struct sppp *) ifp, m); 528 m_freem(m); 529 return; 530 #ifdef INET 531 case ETHERTYPE_IP: 532 schednetisr(NETISR_IP); 533 inq = &ipintrq; 534 break; 535 #endif 536 #ifdef INET6 537 case ETHERTYPE_IPV6: 538 schednetisr(NETISR_IPV6); 539 inq = &ip6intrq; 540 break; 541 #endif 542 #ifdef IPX 543 case ETHERTYPE_IPX: 544 schednetisr(NETISR_IPX); 545 inq = &ipxintrq; 546 break; 547 #endif 548 #ifdef NS 549 case ETHERTYPE_NS: 550 schednetisr(NETISR_NS); 551 inq = &nsintrq; 552 break; 553 #endif 554 } 555 goto queue_pkt; 556 default: /* Invalid PPP packet. */ 557 invalid: 558 if (debug) 559 log(LOG_DEBUG, 560 "%s: invalid input packet " 561 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 562 ifp->if_xname, 563 h->address, h->control, ntohs(h->protocol)); 564 goto drop; 565 } 566 protocol = ntohs(h->protocol); 567 } 568 569 switch (protocol) { 570 default: 571 if (sp->state[IDX_LCP] == STATE_OPENED) { 572 u_int16_t prot = htons(protocol); 573 sppp_cp_send(sp, PPP_LCP, PROTO_REJ, 574 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 575 &prot); 576 } 577 if (debug) 578 log(LOG_DEBUG, 579 "%s: invalid input protocol " 580 "<proto=0x%x>\n", ifp->if_xname, ntohs(protocol)); 581 ++ifp->if_noproto; 582 goto drop; 583 case PPP_LCP: 584 sppp_cp_input(&lcp, sp, m); 585 m_freem(m); 586 return; 587 case PPP_PAP: 588 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 589 sppp_pap_input(sp, m); 590 m_freem(m); 591 return; 592 case PPP_CHAP: 593 if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) 594 sppp_chap_input(sp, m); 595 m_freem(m); 596 return; 597 #ifdef INET 598 case PPP_IPCP: 599 if (sp->pp_phase == SPPP_PHASE_NETWORK) 600 sppp_cp_input(&ipcp, sp, m); 601 m_freem(m); 602 return; 603 case PPP_IP: 604 if (sp->state[IDX_IPCP] == STATE_OPENED) { 605 schednetisr(NETISR_IP); 606 inq = &ipintrq; 607 sp->pp_last_activity = mono_time.tv_sec; 608 } 609 break; 610 #endif 611 #ifdef INET6 612 case PPP_IPV6CP: 613 if (sp->pp_phase == SPPP_PHASE_NETWORK) 614 sppp_cp_input(&ipv6cp, sp, m); 615 m_freem(m); 616 return; 617 618 case PPP_IPV6: 619 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 620 schednetisr(NETISR_IPV6); 621 inq = &ip6intrq; 622 sp->pp_last_activity = mono_time.tv_sec; 623 } 624 break; 625 #endif 626 #ifdef IPX 627 case PPP_IPX: 628 /* IPX IPXCP not implemented yet */ 629 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 630 schednetisr(NETISR_IPX); 631 inq = &ipxintrq; 632 } 633 break; 634 #endif 635 #ifdef NS 636 case PPP_XNS: 637 /* XNS IDPCP not implemented yet */ 638 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 639 schednetisr(NETISR_NS); 640 inq = &nsintrq; 641 } 642 break; 643 #endif 644 #ifdef ISO 645 case PPP_ISO: 646 /* OSI NLCP not implemented yet */ 647 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 648 schednetisr(NETISR_ISO); 649 inq = &clnlintrq; 650 } 651 break; 652 #endif 653 } 654 655 queue_pkt: 656 if (! (ifp->if_flags & IFF_UP) || ! inq) 657 goto drop; 658 659 /* Check queue. */ 660 s = splnet(); 661 if (IF_QFULL(inq)) { 662 /* Queue overflow. */ 663 IF_DROP(inq); 664 splx(s); 665 if (debug) 666 log(LOG_DEBUG, "%s: protocol queue overflow\n", 667 ifp->if_xname); 668 goto drop; 669 } 670 IF_ENQUEUE(inq, m); 671 splx(s); 672 } 673 674 /* 675 * Enqueue transmit packet. 676 */ 677 static int 678 sppp_output(struct ifnet *ifp, struct mbuf *m, 679 struct sockaddr *dst, struct rtentry *rt) 680 { 681 struct sppp *sp = (struct sppp *) ifp; 682 struct ppp_header *h = NULL; 683 struct ifqueue *ifq = NULL; /* XXX */ 684 int s, len, rv = 0; 685 u_int16_t protocol; 686 ALTQ_DECL(struct altq_pktattr pktattr;) 687 688 s = splnet(); 689 690 sp->pp_last_activity = mono_time.tv_sec; 691 692 if ((ifp->if_flags & IFF_UP) == 0 || 693 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 694 m_freem(m); 695 splx(s); 696 return (ENETDOWN); 697 } 698 699 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 700 /* 701 * Interface is not yet running, but auto-dial. Need 702 * to start LCP for it. 703 */ 704 ifp->if_flags |= IFF_RUNNING; 705 splx(s); 706 lcp.Open(sp); 707 s = splnet(); 708 } 709 710 /* 711 * If the queueing discipline needs packet classification, 712 * do it before prepending link headers. 713 */ 714 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 715 716 #ifdef INET 717 if (dst->sa_family == AF_INET) { 718 struct ip *ip = NULL; 719 struct tcphdr *th = NULL; 720 721 if (m->m_len >= sizeof(struct ip)) { 722 ip = mtod(m, struct ip *); 723 if (ip->ip_p == IPPROTO_TCP && 724 m->m_len >= sizeof(struct ip) + (ip->ip_hl << 2) + 725 sizeof(struct tcphdr)) { 726 th = (struct tcphdr *) 727 ((caddr_t)ip + (ip->ip_hl << 2)); 728 } 729 } else 730 ip = NULL; 731 732 /* 733 * When using dynamic local IP address assignment by using 734 * 0.0.0.0 as a local address, the first TCP session will 735 * not connect because the local TCP checksum is computed 736 * using 0.0.0.0 which will later become our real IP address 737 * so the TCP checksum computed at the remote end will 738 * become invalid. So we 739 * - don't let packets with src ip addr 0 thru 740 * - we flag TCP packets with src ip 0 as an error 741 */ 742 if (ip && ip->ip_src.s_addr == INADDR_ANY) { 743 u_int8_t proto = ip->ip_p; 744 745 m_freem(m); 746 splx(s); 747 if (proto == IPPROTO_TCP) 748 return (EADDRNOTAVAIL); 749 else 750 return (0); 751 } 752 753 /* 754 * Put low delay, telnet, rlogin and ftp control packets 755 * in front of the queue. 756 */ 757 758 if (!IF_QFULL(&sp->pp_fastq) && 759 ((ip && (ip->ip_tos & IPTOS_LOWDELAY)) || 760 (th && (INTERACTIVE(ntohs(th->th_sport)) || 761 INTERACTIVE(ntohs(th->th_dport)))))) 762 ifq = &sp->pp_fastq; 763 } 764 #endif 765 766 #ifdef INET6 767 if (dst->sa_family == AF_INET6) { 768 /* XXX do something tricky here? */ 769 } 770 #endif 771 772 if ((sp->pp_flags & PP_NOFRAMING) == 0) { 773 /* 774 * Prepend general data packet PPP header. For now, IP only. 775 */ 776 M_PREPEND(m, PPP_HEADER_LEN, M_DONTWAIT); 777 if (! m) { 778 if (ifp->if_flags & IFF_DEBUG) 779 log(LOG_DEBUG, "%s: no memory for transmit header\n", 780 ifp->if_xname); 781 ++ifp->if_oerrors; 782 splx(s); 783 return (ENOBUFS); 784 } 785 /* 786 * May want to check size of packet 787 * (albeit due to the implementation it's always enough) 788 */ 789 h = mtod(m, struct ppp_header *); 790 if (sp->pp_flags & PP_CISCO) { 791 h->address = CISCO_UNICAST; /* unicast address */ 792 h->control = 0; 793 } else { 794 h->address = PPP_ALLSTATIONS; /* broadcast address */ 795 h->control = PPP_UI; /* Unnumbered Info */ 796 } 797 } 798 799 switch (dst->sa_family) { 800 #ifdef INET 801 case AF_INET: /* Internet Protocol */ 802 if (sp->pp_flags & PP_CISCO) 803 protocol = htons(ETHERTYPE_IP); 804 else { 805 /* 806 * Don't choke with an ENETDOWN early. It's 807 * possible that we just started dialing out, 808 * so don't drop the packet immediately. If 809 * we notice that we run out of buffer space 810 * below, we will however remember that we are 811 * not ready to carry IP packets, and return 812 * ENETDOWN, as opposed to ENOBUFS. 813 */ 814 protocol = htons(PPP_IP); 815 if (sp->state[IDX_IPCP] != STATE_OPENED) 816 rv = ENETDOWN; 817 } 818 break; 819 #endif 820 #ifdef INET6 821 case AF_INET6: /* Internet Protocol version 6 */ 822 if (sp->pp_flags & PP_CISCO) 823 protocol = htons(ETHERTYPE_IPV6); 824 else { 825 /* 826 * Don't choke with an ENETDOWN early. It's 827 * possible that we just started dialing out, 828 * so don't drop the packet immediately. If 829 * we notice that we run out of buffer space 830 * below, we will however remember that we are 831 * not ready to carry IP packets, and return 832 * ENETDOWN, as opposed to ENOBUFS. 833 */ 834 protocol = htons(PPP_IPV6); 835 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 836 rv = ENETDOWN; 837 } 838 break; 839 #endif 840 #ifdef NS 841 case AF_NS: /* Xerox NS Protocol */ 842 protocol = htons((sp->pp_flags & PP_CISCO) ? 843 ETHERTYPE_NS : PPP_XNS); 844 break; 845 #endif 846 #ifdef IPX 847 case AF_IPX: /* Novell IPX Protocol */ 848 protocol = htons((sp->pp_flags & PP_CISCO) ? 849 ETHERTYPE_IPX : PPP_IPX); 850 break; 851 #endif 852 #ifdef ISO 853 case AF_ISO: /* ISO OSI Protocol */ 854 if (sp->pp_flags & PP_CISCO) 855 goto nosupport; 856 protocol = htons(PPP_ISO); 857 break; 858 nosupport: 859 #endif 860 default: 861 m_freem(m); 862 ++ifp->if_oerrors; 863 splx(s); 864 return (EAFNOSUPPORT); 865 } 866 867 if (sp->pp_flags & PP_NOFRAMING) { 868 M_PREPEND(m, 2, M_DONTWAIT); 869 if (m == NULL) { 870 if (ifp->if_flags & IFF_DEBUG) 871 log(LOG_DEBUG, "%s: no memory for transmit header\n", 872 ifp->if_xname); 873 ++ifp->if_oerrors; 874 splx(s); 875 return (ENOBUFS); 876 } 877 *mtod(m, u_int16_t *) = protocol; 878 } else { 879 h->protocol = protocol; 880 } 881 882 /* 883 * Queue message on interface, and start output if interface 884 * not yet active. 885 */ 886 len = m->m_pkthdr.len; 887 if (ifq != NULL 888 #ifdef ALTQ 889 && ALTQ_IS_ENABLED(&ifp->if_snd) == 0 890 #endif 891 ) { 892 if (IF_QFULL(ifq)) { 893 IF_DROP(&ifp->if_snd); 894 m_freem(m); 895 if (rv == 0) 896 rv = ENOBUFS; 897 } 898 else 899 IF_ENQUEUE(ifq, m); 900 } else 901 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, rv); 902 if (rv != 0) { 903 ++ifp->if_oerrors; 904 splx(s); 905 return (rv); 906 } 907 908 if (! (ifp->if_flags & IFF_OACTIVE)) 909 (*ifp->if_start)(ifp); 910 911 /* 912 * Count output packets and bytes. 913 * The packet length includes header + additional hardware framing 914 * according to RFC 1333. 915 */ 916 ifp->if_obytes += len + sp->pp_framebytes; 917 splx(s); 918 return (0); 919 } 920 921 void 922 sppp_attach(struct ifnet *ifp) 923 { 924 struct sppp *sp = (struct sppp *) ifp; 925 926 /* Initialize keepalive handler. */ 927 if (! spppq) { 928 callout_init(&keepalive_ch); 929 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 930 } 931 932 /* Insert new entry into the keepalive list. */ 933 sp->pp_next = spppq; 934 spppq = sp; 935 936 sp->pp_if.if_type = IFT_PPP; 937 sp->pp_if.if_output = sppp_output; 938 sp->pp_fastq.ifq_maxlen = 32; 939 sp->pp_cpq.ifq_maxlen = 20; 940 sp->pp_loopcnt = 0; 941 sp->pp_alivecnt = 0; 942 sp->pp_last_activity = 0; 943 sp->pp_idle_timeout = 0; 944 memset(&sp->pp_seq[0], 0, sizeof(sp->pp_seq)); 945 memset(&sp->pp_rseq[0], 0, sizeof(sp->pp_rseq)); 946 sp->pp_auth_failures = 0; 947 sp->pp_max_auth_fail = DEFAULT_MAX_AUTH_FAILURES; 948 sp->pp_phase = SPPP_PHASE_DEAD; 949 sp->pp_up = lcp.Up; 950 sp->pp_down = lcp.Down; 951 952 if_alloc_sadl(ifp); 953 954 memset(&sp->myauth, 0, sizeof sp->myauth); 955 memset(&sp->hisauth, 0, sizeof sp->hisauth); 956 sppp_lcp_init(sp); 957 sppp_ipcp_init(sp); 958 sppp_ipv6cp_init(sp); 959 sppp_pap_init(sp); 960 sppp_chap_init(sp); 961 } 962 963 void 964 sppp_detach(struct ifnet *ifp) 965 { 966 struct sppp **q, *p, *sp = (struct sppp *) ifp; 967 int i; 968 969 /* Remove the entry from the keepalive list. */ 970 for (q = &spppq; (p = *q); q = &p->pp_next) 971 if (p == sp) { 972 *q = p->pp_next; 973 break; 974 } 975 976 /* Stop keepalive handler. */ 977 if (! spppq) { 978 callout_stop(&keepalive_ch); 979 } 980 981 for (i = 0; i < IDX_COUNT; i++) { 982 callout_stop(&sp->ch[i]); 983 } 984 callout_stop(&sp->pap_my_to_ch); 985 986 /* free authentication info */ 987 if (sp->myauth.name) free(sp->myauth.name, M_DEVBUF); 988 if (sp->myauth.secret) free(sp->myauth.secret, M_DEVBUF); 989 if (sp->hisauth.name) free(sp->hisauth.name, M_DEVBUF); 990 if (sp->hisauth.secret) free(sp->hisauth.secret, M_DEVBUF); 991 992 #if 0 /* done in if_detach() */ 993 if_free_sadl(ifp); 994 #endif 995 } 996 997 /* 998 * Flush the interface output queue. 999 */ 1000 void 1001 sppp_flush(struct ifnet *ifp) 1002 { 1003 struct sppp *sp = (struct sppp *) ifp; 1004 1005 IFQ_PURGE(&sp->pp_if.if_snd); 1006 IF_PURGE(&sp->pp_fastq); 1007 IF_PURGE(&sp->pp_cpq); 1008 } 1009 1010 /* 1011 * Check if the output queue is empty. 1012 */ 1013 int 1014 sppp_isempty(struct ifnet *ifp) 1015 { 1016 struct sppp *sp = (struct sppp *) ifp; 1017 int empty, s; 1018 1019 s = splnet(); 1020 empty = IF_IS_EMPTY(&sp->pp_fastq) && IF_IS_EMPTY(&sp->pp_cpq) && 1021 IFQ_IS_EMPTY(&sp->pp_if.if_snd); 1022 splx(s); 1023 return (empty); 1024 } 1025 1026 /* 1027 * Get next packet to send. 1028 */ 1029 struct mbuf * 1030 sppp_dequeue(struct ifnet *ifp) 1031 { 1032 struct sppp *sp = (struct sppp *) ifp; 1033 struct mbuf *m; 1034 int s; 1035 1036 s = splnet(); 1037 /* 1038 * Process only the control protocol queue until we have at 1039 * least one NCP open. 1040 * 1041 * Do always serve all three queues in Cisco mode. 1042 */ 1043 IF_DEQUEUE(&sp->pp_cpq, m); 1044 if (m == NULL && 1045 (sppp_ncp_check(sp) || (sp->pp_flags & PP_CISCO) != 0)) { 1046 IF_DEQUEUE(&sp->pp_fastq, m); 1047 if (m == NULL) 1048 IF_DEQUEUE(&sp->pp_if.if_snd, m); 1049 } 1050 splx(s); 1051 return m; 1052 } 1053 1054 /* 1055 * Pick the next packet, do not remove it from the queue. 1056 */ 1057 struct mbuf * 1058 sppp_pick(struct ifnet *ifp) 1059 { 1060 struct sppp *sp = (struct sppp *)ifp; 1061 struct mbuf *m; 1062 int s; 1063 1064 s= splnet(); 1065 1066 m = sp->pp_cpq.ifq_head; 1067 if (m == NULL && 1068 (sp->pp_phase == SPPP_PHASE_NETWORK || 1069 (sp->pp_flags & PP_CISCO) != 0)) 1070 if ((m = sp->pp_fastq.ifq_head) == NULL) 1071 m = sp->pp_if.if_snd.ifq_head; 1072 splx(s); 1073 return (m); 1074 } 1075 1076 /* 1077 * Process an ioctl request. Called on low priority level. 1078 */ 1079 int 1080 sppp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1081 { 1082 struct ifreq *ifr = (struct ifreq *) data; 1083 struct sppp *sp = (struct sppp *) ifp; 1084 int s, error=0, going_up, going_down, newmode; 1085 1086 s = splnet(); 1087 switch (cmd) { 1088 case SIOCAIFADDR: 1089 case SIOCSIFDSTADDR: 1090 break; 1091 1092 case SIOCSIFADDR: 1093 if_up(ifp); 1094 /* fall through... */ 1095 1096 case SIOCSIFFLAGS: 1097 going_up = ifp->if_flags & IFF_UP && 1098 (ifp->if_flags & IFF_RUNNING) == 0; 1099 going_down = (ifp->if_flags & IFF_UP) == 0 && 1100 ifp->if_flags & IFF_RUNNING; 1101 newmode = ifp->if_flags & (IFF_AUTO | IFF_PASSIVE); 1102 if (newmode == (IFF_AUTO | IFF_PASSIVE)) { 1103 /* sanity */ 1104 newmode = IFF_PASSIVE; 1105 ifp->if_flags &= ~IFF_AUTO; 1106 } 1107 1108 if (going_up || going_down) 1109 lcp.Close(sp); 1110 if (going_up && newmode == 0) { 1111 /* neither auto-dial nor passive */ 1112 ifp->if_flags |= IFF_RUNNING; 1113 if (!(sp->pp_flags & PP_CISCO)) 1114 lcp.Open(sp); 1115 } else if (going_down) { 1116 sppp_flush(ifp); 1117 ifp->if_flags &= ~IFF_RUNNING; 1118 } 1119 1120 break; 1121 1122 #ifdef SIOCSIFMTU 1123 #ifndef ifr_mtu 1124 #define ifr_mtu ifr_metric 1125 #endif 1126 case SIOCSIFMTU: 1127 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) { 1128 error = EINVAL; 1129 break; 1130 } 1131 1132 ifp->if_mtu = ifr->ifr_mtu; 1133 break; 1134 #endif 1135 #ifdef SLIOCSETMTU 1136 case SLIOCSETMTU: 1137 if (*(short *)data < 128 || *(short *)data > sp->lcp.their_mru) 1138 { 1139 error = EINVAL; 1140 break; 1141 } 1142 1143 ifp->if_mtu = *(short *)data; 1144 break; 1145 #endif 1146 #ifdef SIOCGIFMTU 1147 case SIOCGIFMTU: 1148 ifr->ifr_mtu = ifp->if_mtu; 1149 break; 1150 #endif 1151 #ifdef SLIOCGETMTU 1152 case SLIOCGETMTU: 1153 *(short *)data = ifp->if_mtu; 1154 break; 1155 #endif 1156 case SIOCADDMULTI: 1157 case SIOCDELMULTI: 1158 break; 1159 1160 case SPPPSETAUTHCFG: 1161 case SPPPSETLCPCFG: 1162 case SPPPSETIDLETO: 1163 case SPPPSETAUTHFAILURE: 1164 case SPPPSETDNSOPTS: 1165 { 1166 struct proc *p = curproc; /* XXX */ 1167 1168 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1169 break; 1170 } 1171 /* FALLTHROUGH */ 1172 case SPPPGETAUTHCFG: 1173 case SPPPGETLCPCFG: 1174 case SPPPGETSTATUS: 1175 case SPPPGETIDLETO: 1176 case SPPPGETAUTHFAILURES: 1177 case SPPPGETDNSOPTS: 1178 case SPPPGETDNSADDRS: 1179 error = sppp_params(sp, cmd, data); 1180 break; 1181 1182 default: 1183 error = ENOTTY; 1184 } 1185 splx(s); 1186 return (error); 1187 } 1188 1189 1190 /* 1191 * Cisco framing implementation. 1192 */ 1193 1194 /* 1195 * Handle incoming Cisco keepalive protocol packets. 1196 */ 1197 static void 1198 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1199 { 1200 STDDCL; 1201 struct cisco_packet *h; 1202 u_int32_t me, mymask; 1203 1204 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1205 if (debug) 1206 log(LOG_DEBUG, 1207 "%s: cisco invalid packet length: %d bytes\n", 1208 ifp->if_xname, m->m_pkthdr.len); 1209 return; 1210 } 1211 h = mtod(m, struct cisco_packet *); 1212 if (debug) 1213 log(LOG_DEBUG, 1214 "%s: cisco input: %d bytes " 1215 "<0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1216 ifp->if_xname, m->m_pkthdr.len, 1217 ntohl (h->type), h->par1, h->par2, (u_int)h->rel, 1218 (u_int)h->time0, (u_int)h->time1); 1219 switch (ntohl (h->type)) { 1220 default: 1221 if (debug) 1222 addlog("%s: cisco unknown packet type: 0x%x\n", 1223 ifp->if_xname, ntohl (h->type)); 1224 break; 1225 case CISCO_ADDR_REPLY: 1226 /* Reply on address request, ignore */ 1227 break; 1228 case CISCO_KEEPALIVE_REQ: 1229 sp->pp_alivecnt = 0; 1230 sp->pp_rseq[IDX_LCP] = ntohl (h->par1); 1231 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1232 /* Local and remote sequence numbers are equal. 1233 * Probably, the line is in loopback mode. */ 1234 if (sp->pp_loopcnt >= MAXALIVECNT) { 1235 printf ("%s: loopback\n", 1236 ifp->if_xname); 1237 sp->pp_loopcnt = 0; 1238 if (ifp->if_flags & IFF_UP) { 1239 if_down(ifp); 1240 IF_PURGE(&sp->pp_cpq); 1241 } 1242 } 1243 ++sp->pp_loopcnt; 1244 1245 /* Generate new local sequence number */ 1246 sp->pp_seq[IDX_LCP] = arc4random(); 1247 break; 1248 } 1249 sp->pp_loopcnt = 0; 1250 if (! (ifp->if_flags & IFF_UP) && 1251 (ifp->if_flags & IFF_RUNNING)) { 1252 if_up(ifp); 1253 } 1254 break; 1255 case CISCO_ADDR_REQ: 1256 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1257 if (me != 0L) 1258 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1259 break; 1260 } 1261 } 1262 1263 /* 1264 * Send Cisco keepalive packet. 1265 */ 1266 static void 1267 sppp_cisco_send(struct sppp *sp, int type, int32_t par1, int32_t par2) 1268 { 1269 STDDCL; 1270 struct ppp_header *h; 1271 struct cisco_packet *ch; 1272 struct mbuf *m; 1273 u_int32_t t = (time.tv_sec - boottime.tv_sec) * 1000; 1274 1275 MGETHDR(m, M_DONTWAIT, MT_DATA); 1276 if (! m) 1277 return; 1278 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1279 m->m_pkthdr.rcvif = 0; 1280 1281 h = mtod(m, struct ppp_header *); 1282 h->address = CISCO_MULTICAST; 1283 h->control = 0; 1284 h->protocol = htons(CISCO_KEEPALIVE); 1285 1286 ch = (struct cisco_packet *)(h + 1); 1287 ch->type = htonl(type); 1288 ch->par1 = htonl(par1); 1289 ch->par2 = htonl(par2); 1290 ch->rel = -1; 1291 1292 ch->time0 = htons((u_short)(t >> 16)); 1293 ch->time1 = htons((u_short) t); 1294 1295 if (debug) 1296 log(LOG_DEBUG, 1297 "%s: cisco output: <0x%x 0x%x 0x%x 0x%x 0x%x-0x%x>\n", 1298 ifp->if_xname, ntohl (ch->type), ch->par1, 1299 ch->par2, (u_int)ch->rel, (u_int)ch->time0, 1300 (u_int)ch->time1); 1301 1302 if (IF_QFULL(&sp->pp_cpq)) { 1303 IF_DROP(&sp->pp_fastq); 1304 IF_DROP(&ifp->if_snd); 1305 m_freem(m); 1306 ++ifp->if_oerrors; 1307 return; 1308 } else 1309 IF_ENQUEUE(&sp->pp_cpq, m); 1310 if (! (ifp->if_flags & IFF_OACTIVE)) 1311 (*ifp->if_start)(ifp); 1312 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1313 } 1314 1315 /* 1316 * PPP protocol implementation. 1317 */ 1318 1319 /* 1320 * Send PPP control protocol packet. 1321 */ 1322 static void 1323 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1324 u_char ident, u_short len, void *data) 1325 { 1326 STDDCL; 1327 struct lcp_header *lh; 1328 struct mbuf *m; 1329 size_t pkthdrlen; 1330 1331 pkthdrlen = (sp->pp_flags & PP_NOFRAMING) ? 2 : PPP_HEADER_LEN; 1332 1333 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) 1334 len = MHLEN - pkthdrlen - LCP_HEADER_LEN; 1335 MGETHDR(m, M_DONTWAIT, MT_DATA); 1336 if (! m) 1337 return; 1338 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 1339 m->m_pkthdr.rcvif = 0; 1340 1341 if (sp->pp_flags & PP_NOFRAMING) { 1342 *mtod(m, u_int16_t *) = htons(proto); 1343 lh = (struct lcp_header *)(mtod(m, u_int8_t *) + 2); 1344 } else { 1345 struct ppp_header *h; 1346 h = mtod(m, struct ppp_header *); 1347 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1348 h->control = PPP_UI; /* Unnumbered Info */ 1349 h->protocol = htons(proto); /* Link Control Protocol */ 1350 lh = (struct lcp_header *)(h + 1); 1351 } 1352 lh->type = type; 1353 lh->ident = ident; 1354 lh->len = htons(LCP_HEADER_LEN + len); 1355 if (len) 1356 bcopy (data, lh + 1, len); 1357 1358 if (debug) { 1359 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 1360 ifp->if_xname, 1361 sppp_proto_name(proto), 1362 sppp_cp_type_name(lh->type), lh->ident, ntohs(lh->len)); 1363 if (len) 1364 sppp_print_bytes((u_char *)(lh + 1), len); 1365 addlog(">\n"); 1366 } 1367 if (IF_QFULL(&sp->pp_cpq)) { 1368 IF_DROP(&sp->pp_fastq); 1369 IF_DROP(&ifp->if_snd); 1370 m_freem(m); 1371 ++ifp->if_oerrors; 1372 return; 1373 } else 1374 IF_ENQUEUE(&sp->pp_cpq, m); 1375 if (! (ifp->if_flags & IFF_OACTIVE)) 1376 (*ifp->if_start)(ifp); 1377 ifp->if_obytes += m->m_pkthdr.len + sp->pp_framebytes; 1378 } 1379 1380 /* 1381 * Handle incoming PPP control protocol packets. 1382 */ 1383 static void 1384 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1385 { 1386 STDDCL; 1387 struct lcp_header *h; 1388 int len = m->m_pkthdr.len; 1389 int rv; 1390 u_char *p; 1391 u_int32_t u32; 1392 1393 if (len < 4) { 1394 if (debug) 1395 log(LOG_DEBUG, 1396 "%s: %s invalid packet length: %d bytes\n", 1397 ifp->if_xname, cp->name, len); 1398 return; 1399 } 1400 h = mtod(m, struct lcp_header *); 1401 if (debug) { 1402 log(LOG_DEBUG, 1403 "%s: %s input(%s): <%s id=0x%x len=%d", 1404 ifp->if_xname, cp->name, 1405 sppp_state_name(sp->state[cp->protoidx]), 1406 sppp_cp_type_name(h->type), h->ident, ntohs(h->len)); 1407 if (len > 4) 1408 sppp_print_bytes((u_char *)(h + 1), len - 4); 1409 addlog(">\n"); 1410 } 1411 if (len > ntohs(h->len)) 1412 len = ntohs(h->len); 1413 p = (u_char *)(h + 1); 1414 switch (h->type) { 1415 case CONF_REQ: 1416 if (len < 4) { 1417 if (debug) 1418 addlog("%s: %s invalid conf-req length %d\n", 1419 ifp->if_xname, cp->name, 1420 len); 1421 ++ifp->if_ierrors; 1422 break; 1423 } 1424 /* handle states where RCR doesn't get a SCA/SCN */ 1425 switch (sp->state[cp->protoidx]) { 1426 case STATE_CLOSING: 1427 case STATE_STOPPING: 1428 return; 1429 case STATE_CLOSED: 1430 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1431 0, 0); 1432 return; 1433 } 1434 rv = (cp->RCR)(sp, h, len); 1435 switch (sp->state[cp->protoidx]) { 1436 case STATE_OPENED: 1437 (cp->tld)(sp); 1438 (cp->scr)(sp); 1439 /* fall through... */ 1440 case STATE_ACK_SENT: 1441 case STATE_REQ_SENT: 1442 sppp_cp_change_state(cp, sp, rv? 1443 STATE_ACK_SENT: STATE_REQ_SENT); 1444 break; 1445 case STATE_STOPPED: 1446 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1447 (cp->scr)(sp); 1448 sppp_cp_change_state(cp, sp, rv? 1449 STATE_ACK_SENT: STATE_REQ_SENT); 1450 break; 1451 case STATE_ACK_RCVD: 1452 if (rv) { 1453 sppp_cp_change_state(cp, sp, STATE_OPENED); 1454 if (debug) 1455 log(LOG_DEBUG, "%s: %s tlu\n", 1456 ifp->if_xname, 1457 cp->name); 1458 (cp->tlu)(sp); 1459 } else 1460 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1461 break; 1462 default: 1463 printf("%s: %s illegal %s in state %s\n", 1464 ifp->if_xname, cp->name, 1465 sppp_cp_type_name(h->type), 1466 sppp_state_name(sp->state[cp->protoidx])); 1467 ++ifp->if_ierrors; 1468 } 1469 break; 1470 case CONF_ACK: 1471 if (h->ident != sp->confid[cp->protoidx]) { 1472 if (debug) 1473 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1474 ifp->if_xname, cp->name, 1475 h->ident, sp->confid[cp->protoidx]); 1476 ++ifp->if_ierrors; 1477 break; 1478 } 1479 switch (sp->state[cp->protoidx]) { 1480 case STATE_CLOSED: 1481 case STATE_STOPPED: 1482 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1483 break; 1484 case STATE_CLOSING: 1485 case STATE_STOPPING: 1486 break; 1487 case STATE_REQ_SENT: 1488 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1489 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1490 break; 1491 case STATE_OPENED: 1492 (cp->tld)(sp); 1493 /* fall through */ 1494 case STATE_ACK_RCVD: 1495 (cp->scr)(sp); 1496 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1497 break; 1498 case STATE_ACK_SENT: 1499 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1500 sppp_cp_change_state(cp, sp, STATE_OPENED); 1501 if (debug) 1502 log(LOG_DEBUG, "%s: %s tlu\n", 1503 ifp->if_xname, cp->name); 1504 (cp->tlu)(sp); 1505 break; 1506 default: 1507 printf("%s: %s illegal %s in state %s\n", 1508 ifp->if_xname, cp->name, 1509 sppp_cp_type_name(h->type), 1510 sppp_state_name(sp->state[cp->protoidx])); 1511 ++ifp->if_ierrors; 1512 } 1513 break; 1514 case CONF_NAK: 1515 case CONF_REJ: 1516 if (h->ident != sp->confid[cp->protoidx]) { 1517 if (debug) 1518 addlog("%s: %s id mismatch 0x%x != 0x%x\n", 1519 ifp->if_xname, cp->name, 1520 h->ident, sp->confid[cp->protoidx]); 1521 ++ifp->if_ierrors; 1522 break; 1523 } 1524 if (h->type == CONF_NAK) 1525 (cp->RCN_nak)(sp, h, len); 1526 else /* CONF_REJ */ 1527 (cp->RCN_rej)(sp, h, len); 1528 1529 switch (sp->state[cp->protoidx]) { 1530 case STATE_CLOSED: 1531 case STATE_STOPPED: 1532 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1533 break; 1534 case STATE_REQ_SENT: 1535 case STATE_ACK_SENT: 1536 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1537 (cp->scr)(sp); 1538 break; 1539 case STATE_OPENED: 1540 (cp->tld)(sp); 1541 /* fall through */ 1542 case STATE_ACK_RCVD: 1543 sppp_cp_change_state(cp, sp, STATE_ACK_SENT); 1544 (cp->scr)(sp); 1545 break; 1546 case STATE_CLOSING: 1547 case STATE_STOPPING: 1548 break; 1549 default: 1550 printf("%s: %s illegal %s in state %s\n", 1551 ifp->if_xname, cp->name, 1552 sppp_cp_type_name(h->type), 1553 sppp_state_name(sp->state[cp->protoidx])); 1554 ++ifp->if_ierrors; 1555 } 1556 break; 1557 1558 case TERM_REQ: 1559 switch (sp->state[cp->protoidx]) { 1560 case STATE_ACK_RCVD: 1561 case STATE_ACK_SENT: 1562 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1563 /* fall through */ 1564 case STATE_CLOSED: 1565 case STATE_STOPPED: 1566 case STATE_CLOSING: 1567 case STATE_STOPPING: 1568 case STATE_REQ_SENT: 1569 sta: 1570 /* Send Terminate-Ack packet. */ 1571 if (debug) 1572 log(LOG_DEBUG, "%s: %s send terminate-ack\n", 1573 ifp->if_xname, cp->name); 1574 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1575 break; 1576 case STATE_OPENED: 1577 (cp->tld)(sp); 1578 sp->rst_counter[cp->protoidx] = 0; 1579 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1580 goto sta; 1581 default: 1582 printf("%s: %s illegal %s in state %s\n", 1583 ifp->if_xname, cp->name, 1584 sppp_cp_type_name(h->type), 1585 sppp_state_name(sp->state[cp->protoidx])); 1586 ++ifp->if_ierrors; 1587 } 1588 break; 1589 case TERM_ACK: 1590 switch (sp->state[cp->protoidx]) { 1591 case STATE_CLOSED: 1592 case STATE_STOPPED: 1593 case STATE_REQ_SENT: 1594 case STATE_ACK_SENT: 1595 break; 1596 case STATE_CLOSING: 1597 (cp->tlf)(sp); 1598 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1599 sppp_lcp_check_and_close(sp); 1600 break; 1601 case STATE_STOPPING: 1602 (cp->tlf)(sp); 1603 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1604 sppp_lcp_check_and_close(sp); 1605 break; 1606 case STATE_ACK_RCVD: 1607 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1608 break; 1609 case STATE_OPENED: 1610 (cp->tld)(sp); 1611 (cp->scr)(sp); 1612 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1613 break; 1614 default: 1615 printf("%s: %s illegal %s in state %s\n", 1616 ifp->if_xname, cp->name, 1617 sppp_cp_type_name(h->type), 1618 sppp_state_name(sp->state[cp->protoidx])); 1619 ++ifp->if_ierrors; 1620 } 1621 break; 1622 case CODE_REJ: 1623 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1624 log(LOG_INFO, 1625 "%s: %s: ignoring RXJ (%s) for code ?, " 1626 "danger will robinson\n", 1627 ifp->if_xname, cp->name, 1628 sppp_cp_type_name(h->type)); 1629 switch (sp->state[cp->protoidx]) { 1630 case STATE_CLOSED: 1631 case STATE_STOPPED: 1632 case STATE_REQ_SENT: 1633 case STATE_ACK_SENT: 1634 case STATE_CLOSING: 1635 case STATE_STOPPING: 1636 case STATE_OPENED: 1637 break; 1638 case STATE_ACK_RCVD: 1639 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1640 break; 1641 default: 1642 printf("%s: %s illegal %s in state %s\n", 1643 ifp->if_xname, cp->name, 1644 sppp_cp_type_name(h->type), 1645 sppp_state_name(sp->state[cp->protoidx])); 1646 ++ifp->if_ierrors; 1647 } 1648 break; 1649 case PROTO_REJ: 1650 { 1651 int catastrophic; 1652 const struct cp *upper; 1653 int i; 1654 u_int16_t proto; 1655 1656 catastrophic = 0; 1657 upper = NULL; 1658 proto = p[0] << 8 | p[1]; 1659 for (i = 0; i < IDX_COUNT; i++) { 1660 if (cps[i]->proto == proto) { 1661 upper = cps[i]; 1662 break; 1663 } 1664 } 1665 if (upper == NULL) 1666 catastrophic++; 1667 1668 if (debug) 1669 log(LOG_INFO, 1670 "%s: %s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1671 ifp->if_xname, cp->name, catastrophic ? '-' : '+', 1672 sppp_cp_type_name(h->type), proto, 1673 upper ? upper->name : "unknown", 1674 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1675 1676 /* 1677 * if we got RXJ+ against conf-req, the peer does not implement 1678 * this particular protocol type. terminate the protocol. 1679 */ 1680 if (upper && !catastrophic) { 1681 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1682 upper->Close(sp); 1683 break; 1684 } 1685 } 1686 1687 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1688 switch (sp->state[cp->protoidx]) { 1689 case STATE_CLOSED: 1690 case STATE_STOPPED: 1691 case STATE_REQ_SENT: 1692 case STATE_ACK_SENT: 1693 case STATE_CLOSING: 1694 case STATE_STOPPING: 1695 case STATE_OPENED: 1696 break; 1697 case STATE_ACK_RCVD: 1698 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1699 break; 1700 default: 1701 printf("%s: %s illegal %s in state %s\n", 1702 ifp->if_xname, cp->name, 1703 sppp_cp_type_name(h->type), 1704 sppp_state_name(sp->state[cp->protoidx])); 1705 ++ifp->if_ierrors; 1706 } 1707 break; 1708 } 1709 case DISC_REQ: 1710 if (cp->proto != PPP_LCP) 1711 goto illegal; 1712 /* Discard the packet. */ 1713 break; 1714 case ECHO_REQ: 1715 if (cp->proto != PPP_LCP) 1716 goto illegal; 1717 if (sp->state[cp->protoidx] != STATE_OPENED) { 1718 if (debug) 1719 addlog("%s: lcp echo req but lcp closed\n", 1720 ifp->if_xname); 1721 ++ifp->if_ierrors; 1722 break; 1723 } 1724 if (len < 8) { 1725 if (debug) 1726 addlog("%s: invalid lcp echo request " 1727 "packet length: %d bytes\n", 1728 ifp->if_xname, len); 1729 break; 1730 } 1731 memcpy(&u32, h + 1, sizeof u32); 1732 if (ntohl(u32) == sp->lcp.magic) { 1733 /* Line loopback mode detected. */ 1734 printf("%s: loopback\n", ifp->if_xname); 1735 if_down(ifp); 1736 IF_PURGE(&sp->pp_cpq); 1737 1738 /* Shut down the PPP link. */ 1739 /* XXX */ 1740 lcp.Down(sp); 1741 lcp.Up(sp); 1742 break; 1743 } 1744 u32 = htonl(sp->lcp.magic); 1745 memcpy(h + 1, &u32, sizeof u32); 1746 if (debug) 1747 addlog("%s: got lcp echo req, sending echo rep\n", 1748 ifp->if_xname); 1749 sppp_cp_send(sp, PPP_LCP, ECHO_REPLY, h->ident, len - 4, 1750 h + 1); 1751 break; 1752 case ECHO_REPLY: 1753 if (cp->proto != PPP_LCP) 1754 goto illegal; 1755 if (h->ident != sp->lcp.echoid) { 1756 ++ifp->if_ierrors; 1757 break; 1758 } 1759 if (len < 8) { 1760 if (debug) 1761 addlog("%s: lcp invalid echo reply " 1762 "packet length: %d bytes\n", 1763 ifp->if_xname, len); 1764 break; 1765 } 1766 if (debug) 1767 addlog("%s: lcp got echo rep\n", 1768 ifp->if_xname); 1769 memcpy(&u32, h + 1, sizeof u32); 1770 if (ntohl(u32) != sp->lcp.magic) 1771 sp->pp_alivecnt = 0; 1772 break; 1773 default: 1774 /* Unknown packet type -- send Code-Reject packet. */ 1775 illegal: 1776 if (debug) 1777 addlog("%s: %s send code-rej for 0x%x\n", 1778 ifp->if_xname, cp->name, h->type); 1779 sppp_cp_send(sp, cp->proto, CODE_REJ, 1780 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1781 ++ifp->if_ierrors; 1782 } 1783 } 1784 1785 1786 /* 1787 * The generic part of all Up/Down/Open/Close/TO event handlers. 1788 * Basically, the state transition handling in the automaton. 1789 */ 1790 static void 1791 sppp_up_event(const struct cp *cp, struct sppp *sp) 1792 { 1793 STDDCL; 1794 1795 if (debug) 1796 log(LOG_DEBUG, "%s: %s up(%s)\n", 1797 ifp->if_xname, cp->name, 1798 sppp_state_name(sp->state[cp->protoidx])); 1799 1800 switch (sp->state[cp->protoidx]) { 1801 case STATE_INITIAL: 1802 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1803 break; 1804 case STATE_STARTING: 1805 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1806 (cp->scr)(sp); 1807 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1808 break; 1809 default: 1810 printf("%s: %s illegal up in state %s\n", 1811 ifp->if_xname, cp->name, 1812 sppp_state_name(sp->state[cp->protoidx])); 1813 } 1814 } 1815 1816 static void 1817 sppp_down_event(const struct cp *cp, struct sppp *sp) 1818 { 1819 STDDCL; 1820 1821 if (debug) 1822 log(LOG_DEBUG, "%s: %s down(%s)\n", 1823 ifp->if_xname, cp->name, 1824 sppp_state_name(sp->state[cp->protoidx])); 1825 1826 switch (sp->state[cp->protoidx]) { 1827 case STATE_CLOSED: 1828 case STATE_CLOSING: 1829 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1830 break; 1831 case STATE_STOPPED: 1832 (cp->tls)(sp); 1833 /* fall through */ 1834 case STATE_STOPPING: 1835 case STATE_REQ_SENT: 1836 case STATE_ACK_RCVD: 1837 case STATE_ACK_SENT: 1838 sppp_cp_change_state(cp, sp, STATE_STARTING); 1839 break; 1840 case STATE_OPENED: 1841 (cp->tld)(sp); 1842 sppp_cp_change_state(cp, sp, STATE_STARTING); 1843 break; 1844 default: 1845 printf("%s: %s illegal down in state %s\n", 1846 ifp->if_xname, cp->name, 1847 sppp_state_name(sp->state[cp->protoidx])); 1848 } 1849 } 1850 1851 1852 static void 1853 sppp_open_event(const struct cp *cp, struct sppp *sp) 1854 { 1855 STDDCL; 1856 1857 if (debug) 1858 log(LOG_DEBUG, "%s: %s open(%s)\n", 1859 ifp->if_xname, cp->name, 1860 sppp_state_name(sp->state[cp->protoidx])); 1861 1862 switch (sp->state[cp->protoidx]) { 1863 case STATE_INITIAL: 1864 (cp->tls)(sp); 1865 sppp_cp_change_state(cp, sp, STATE_STARTING); 1866 break; 1867 case STATE_STARTING: 1868 break; 1869 case STATE_CLOSED: 1870 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1871 (cp->scr)(sp); 1872 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1873 break; 1874 case STATE_STOPPED: 1875 case STATE_STOPPING: 1876 case STATE_REQ_SENT: 1877 case STATE_ACK_RCVD: 1878 case STATE_ACK_SENT: 1879 case STATE_OPENED: 1880 break; 1881 case STATE_CLOSING: 1882 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1883 break; 1884 } 1885 } 1886 1887 1888 static void 1889 sppp_close_event(const struct cp *cp, struct sppp *sp) 1890 { 1891 STDDCL; 1892 1893 if (debug) 1894 log(LOG_DEBUG, "%s: %s close(%s)\n", 1895 ifp->if_xname, cp->name, 1896 sppp_state_name(sp->state[cp->protoidx])); 1897 1898 switch (sp->state[cp->protoidx]) { 1899 case STATE_INITIAL: 1900 case STATE_CLOSED: 1901 case STATE_CLOSING: 1902 break; 1903 case STATE_STARTING: 1904 (cp->tlf)(sp); 1905 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1906 break; 1907 case STATE_STOPPED: 1908 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1909 break; 1910 case STATE_STOPPING: 1911 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1912 break; 1913 case STATE_OPENED: 1914 (cp->tld)(sp); 1915 /* fall through */ 1916 case STATE_REQ_SENT: 1917 case STATE_ACK_RCVD: 1918 case STATE_ACK_SENT: 1919 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1920 sppp_cp_send(sp, cp->proto, TERM_REQ, 1921 ++sp->pp_seq[cp->protoidx], 0, 0); 1922 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1923 break; 1924 } 1925 } 1926 1927 static void 1928 sppp_to_event(const struct cp *cp, struct sppp *sp) 1929 { 1930 STDDCL; 1931 int s; 1932 1933 s = splnet(); 1934 if (debug) 1935 log(LOG_DEBUG, "%s: %s TO(%s) rst_counter = %d\n", 1936 ifp->if_xname, cp->name, 1937 sppp_state_name(sp->state[cp->protoidx]), 1938 sp->rst_counter[cp->protoidx]); 1939 1940 if (--sp->rst_counter[cp->protoidx] < 0) 1941 /* TO- event */ 1942 switch (sp->state[cp->protoidx]) { 1943 case STATE_CLOSING: 1944 (cp->tlf)(sp); 1945 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1946 sppp_lcp_check_and_close(sp); 1947 break; 1948 case STATE_STOPPING: 1949 (cp->tlf)(sp); 1950 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1951 sppp_lcp_check_and_close(sp); 1952 break; 1953 case STATE_REQ_SENT: 1954 case STATE_ACK_RCVD: 1955 case STATE_ACK_SENT: 1956 (cp->tlf)(sp); 1957 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1958 sppp_lcp_check_and_close(sp); 1959 break; 1960 } 1961 else 1962 /* TO+ event */ 1963 switch (sp->state[cp->protoidx]) { 1964 case STATE_CLOSING: 1965 case STATE_STOPPING: 1966 sppp_cp_send(sp, cp->proto, TERM_REQ, 1967 ++sp->pp_seq[cp->protoidx], 0, 0); 1968 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1969 cp->TO, sp); 1970 break; 1971 case STATE_REQ_SENT: 1972 case STATE_ACK_RCVD: 1973 (cp->scr)(sp); 1974 /* sppp_cp_change_state() will restart the timer */ 1975 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1976 break; 1977 case STATE_ACK_SENT: 1978 (cp->scr)(sp); 1979 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 1980 cp->TO, sp); 1981 break; 1982 } 1983 1984 splx(s); 1985 } 1986 1987 /* 1988 * Change the state of a control protocol in the state automaton. 1989 * Takes care of starting/stopping the restart timer. 1990 */ 1991 void 1992 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1993 { 1994 sp->state[cp->protoidx] = newstate; 1995 callout_stop(&sp->ch[cp->protoidx]); 1996 switch (newstate) { 1997 case STATE_INITIAL: 1998 case STATE_STARTING: 1999 case STATE_CLOSED: 2000 case STATE_STOPPED: 2001 case STATE_OPENED: 2002 break; 2003 case STATE_CLOSING: 2004 case STATE_STOPPING: 2005 case STATE_REQ_SENT: 2006 case STATE_ACK_RCVD: 2007 case STATE_ACK_SENT: 2008 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout, 2009 cp->TO, sp); 2010 break; 2011 } 2012 } 2013 2014 /* 2015 *--------------------------------------------------------------------------* 2016 * * 2017 * The LCP implementation. * 2018 * * 2019 *--------------------------------------------------------------------------* 2020 */ 2021 static void 2022 sppp_lcp_init(struct sppp *sp) 2023 { 2024 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2025 sp->lcp.magic = 0; 2026 sp->state[IDX_LCP] = STATE_INITIAL; 2027 sp->fail_counter[IDX_LCP] = 0; 2028 sp->pp_seq[IDX_LCP] = 0; 2029 sp->pp_rseq[IDX_LCP] = 0; 2030 sp->lcp.protos = 0; 2031 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 2032 2033 /* 2034 * Initialize counters and timeout values. Note that we don't 2035 * use the 3 seconds suggested in RFC 1661 since we are likely 2036 * running on a fast link. XXX We should probably implement 2037 * the exponential backoff option. Note that these values are 2038 * relevant for all control protocols, not just LCP only. 2039 */ 2040 sp->lcp.timeout = 1 * hz; 2041 sp->lcp.max_terminate = 2; 2042 sp->lcp.max_configure = 10; 2043 sp->lcp.max_failure = 10; 2044 callout_init(&sp->ch[IDX_LCP]); 2045 } 2046 2047 static void 2048 sppp_lcp_up(struct sppp *sp) 2049 { 2050 STDDCL; 2051 2052 /* Initialize activity timestamp: opening a connection is an activity */ 2053 sp->pp_last_activity = mono_time.tv_sec; 2054 2055 /* 2056 * If this interface is passive or dial-on-demand, and we are 2057 * still in Initial state, it means we've got an incoming 2058 * call. Activate the interface. 2059 */ 2060 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2061 if (debug) 2062 log(LOG_DEBUG, 2063 "%s: Up event", ifp->if_xname); 2064 ifp->if_flags |= IFF_RUNNING; 2065 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2066 if (debug) 2067 addlog("(incoming call)\n"); 2068 sp->pp_flags |= PP_CALLIN; 2069 lcp.Open(sp); 2070 } else if (debug) 2071 addlog("\n"); 2072 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2073 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2074 ifp->if_flags |= IFF_RUNNING; 2075 lcp.Open(sp); 2076 } 2077 2078 sppp_up_event(&lcp, sp); 2079 } 2080 2081 static void 2082 sppp_lcp_down(struct sppp *sp) 2083 { 2084 STDDCL; 2085 2086 sppp_down_event(&lcp, sp); 2087 2088 /* 2089 * If this is neither a dial-on-demand nor a passive 2090 * interface, simulate an ``ifconfig down'' action, so the 2091 * administrator can force a redial by another ``ifconfig 2092 * up''. XXX For leased line operation, should we immediately 2093 * try to reopen the connection here? 2094 */ 2095 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2096 if (debug) 2097 log(LOG_INFO, 2098 "%s: Down event (carrier loss), taking interface down.\n", 2099 ifp->if_xname); 2100 if_down(ifp); 2101 } else { 2102 if (debug) 2103 log(LOG_DEBUG, 2104 "%s: Down event (carrier loss)\n", 2105 ifp->if_xname); 2106 } 2107 sp->pp_flags &= ~PP_CALLIN; 2108 if (sp->state[IDX_LCP] != STATE_INITIAL) 2109 lcp.Close(sp); 2110 ifp->if_flags &= ~IFF_RUNNING; 2111 } 2112 2113 static void 2114 sppp_lcp_open(struct sppp *sp) 2115 { 2116 /* 2117 * If we are authenticator, negotiate LCP_AUTH 2118 */ 2119 if (sp->hisauth.proto != 0) 2120 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2121 else 2122 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2123 sp->pp_flags &= ~PP_NEEDAUTH; 2124 sppp_open_event(&lcp, sp); 2125 } 2126 2127 static void 2128 sppp_lcp_close(struct sppp *sp) 2129 { 2130 sppp_close_event(&lcp, sp); 2131 } 2132 2133 static void 2134 sppp_lcp_TO(void *cookie) 2135 { 2136 sppp_to_event(&lcp, (struct sppp *)cookie); 2137 } 2138 2139 /* 2140 * Analyze a configure request. Return true if it was agreeable, and 2141 * caused action sca, false if it has been rejected or nak'ed, and 2142 * caused action scn. (The return value is used to make the state 2143 * transition decision in the state automaton.) 2144 */ 2145 static int 2146 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2147 { 2148 STDDCL; 2149 u_char *buf, *r, *p; 2150 int origlen, rlen; 2151 u_int32_t nmagic; 2152 u_short authproto; 2153 2154 len -= 4; 2155 origlen = len; 2156 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2157 if (! buf) 2158 return (0); 2159 2160 if (debug) 2161 log(LOG_DEBUG, "%s: lcp parse opts:", 2162 ifp->if_xname); 2163 2164 /* pass 1: check for things that need to be rejected */ 2165 p = (void *)(h + 1); 2166 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2167 if (debug) 2168 addlog(" %s", sppp_lcp_opt_name(*p)); 2169 switch (*p) { 2170 case LCP_OPT_MAGIC: 2171 /* Magic number. */ 2172 /* fall through, both are same length */ 2173 case LCP_OPT_ASYNC_MAP: 2174 /* Async control character map. */ 2175 if (len >= 6 || p[1] == 6) 2176 continue; 2177 if (debug) 2178 addlog(" [invalid]"); 2179 break; 2180 case LCP_OPT_MRU: 2181 /* Maximum receive unit. */ 2182 if (len >= 4 && p[1] == 4) 2183 continue; 2184 if (debug) 2185 addlog(" [invalid]"); 2186 break; 2187 case LCP_OPT_AUTH_PROTO: 2188 if (len < 4) { 2189 if (debug) 2190 addlog(" [invalid]"); 2191 break; 2192 } 2193 authproto = (p[2] << 8) + p[3]; 2194 if (authproto == PPP_CHAP && p[1] != 5) { 2195 if (debug) 2196 addlog(" [invalid chap len]"); 2197 break; 2198 } 2199 if (sp->myauth.proto == 0) { 2200 /* we are not configured to do auth */ 2201 if (debug) 2202 addlog(" [not configured]"); 2203 break; 2204 } 2205 /* 2206 * Remote want us to authenticate, remember this, 2207 * so we stay in SPPP_PHASE_AUTHENTICATE after LCP got 2208 * up. 2209 */ 2210 sp->pp_flags |= PP_NEEDAUTH; 2211 continue; 2212 default: 2213 /* Others not supported. */ 2214 if (debug) 2215 addlog(" [rej]"); 2216 break; 2217 } 2218 /* Add the option to rejected list. */ 2219 bcopy (p, r, p[1]); 2220 r += p[1]; 2221 rlen += p[1]; 2222 } 2223 if (rlen) { 2224 if (debug) 2225 addlog(" send conf-rej\n"); 2226 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2227 goto end; 2228 } else if (debug) 2229 addlog("\n"); 2230 2231 /* 2232 * pass 2: check for option values that are unacceptable and 2233 * thus require to be nak'ed. 2234 */ 2235 if (debug) 2236 log(LOG_DEBUG, "%s: lcp parse opt values: ", 2237 ifp->if_xname); 2238 2239 p = (void *)(h + 1); 2240 len = origlen; 2241 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2242 if (debug) 2243 addlog(" %s", sppp_lcp_opt_name(*p)); 2244 switch (*p) { 2245 case LCP_OPT_MAGIC: 2246 /* Magic number -- extract. */ 2247 nmagic = (u_int32_t)p[2] << 24 | 2248 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2249 if (nmagic != sp->lcp.magic) { 2250 if (debug) 2251 addlog(" 0x%x", nmagic); 2252 continue; 2253 } 2254 /* 2255 * Local and remote magics equal -- loopback? 2256 */ 2257 if (sp->pp_loopcnt >= MAXALIVECNT*5) { 2258 printf ("%s: loopback\n", 2259 ifp->if_xname); 2260 sp->pp_loopcnt = 0; 2261 if (ifp->if_flags & IFF_UP) { 2262 if_down(ifp); 2263 IF_PURGE(&sp->pp_cpq); 2264 /* XXX ? */ 2265 lcp.Down(sp); 2266 lcp.Up(sp); 2267 } 2268 } else if (debug) 2269 addlog(" [glitch]"); 2270 ++sp->pp_loopcnt; 2271 /* 2272 * We negate our magic here, and NAK it. If 2273 * we see it later in an NAK packet, we 2274 * suggest a new one. 2275 */ 2276 nmagic = ~sp->lcp.magic; 2277 /* Gonna NAK it. */ 2278 p[2] = nmagic >> 24; 2279 p[3] = nmagic >> 16; 2280 p[4] = nmagic >> 8; 2281 p[5] = nmagic; 2282 break; 2283 2284 case LCP_OPT_ASYNC_MAP: 2285 /* 2286 * Async control character map -- just ignore it. 2287 * 2288 * Quote from RFC 1662, chapter 6: 2289 * To enable this functionality, synchronous PPP 2290 * implementations MUST always respond to the 2291 * Async-Control-Character-Map Configuration 2292 * Option with the LCP Configure-Ack. However, 2293 * acceptance of the Configuration Option does 2294 * not imply that the synchronous implementation 2295 * will do any ACCM mapping. Instead, all such 2296 * octet mapping will be performed by the 2297 * asynchronous-to-synchronous converter. 2298 */ 2299 continue; 2300 2301 case LCP_OPT_MRU: 2302 /* 2303 * Maximum receive unit. Always agreeable, 2304 * but ignored by now. 2305 */ 2306 sp->lcp.their_mru = p[2] * 256 + p[3]; 2307 if (debug) 2308 addlog(" %ld", sp->lcp.their_mru); 2309 continue; 2310 2311 case LCP_OPT_AUTH_PROTO: 2312 authproto = (p[2] << 8) + p[3]; 2313 if (sp->myauth.proto != authproto) { 2314 /* not agreed, nak */ 2315 if (debug) 2316 addlog(" [mine %s != his %s]", 2317 sppp_proto_name(sp->hisauth.proto), 2318 sppp_proto_name(authproto)); 2319 p[2] = sp->myauth.proto >> 8; 2320 p[3] = sp->myauth.proto; 2321 break; 2322 } 2323 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2324 if (debug) 2325 addlog(" [chap not MD5]"); 2326 p[4] = CHAP_MD5; 2327 break; 2328 } 2329 continue; 2330 } 2331 /* Add the option to nak'ed list. */ 2332 bcopy (p, r, p[1]); 2333 r += p[1]; 2334 rlen += p[1]; 2335 } 2336 if (rlen) { 2337 if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2338 if (debug) 2339 addlog(" max_failure (%d) exceeded, " 2340 "send conf-rej\n", 2341 sp->lcp.max_failure); 2342 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2343 } else { 2344 if (debug) 2345 addlog(" send conf-nak\n"); 2346 sppp_cp_send(sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2347 } 2348 goto end; 2349 } else { 2350 if (debug) 2351 addlog(" send conf-ack\n"); 2352 sp->fail_counter[IDX_LCP] = 0; 2353 sp->pp_loopcnt = 0; 2354 sppp_cp_send(sp, PPP_LCP, CONF_ACK, h->ident, origlen, h + 1); 2355 } 2356 2357 end: 2358 free(buf, M_TEMP); 2359 return (rlen == 0); 2360 } 2361 2362 /* 2363 * Analyze the LCP Configure-Reject option list, and adjust our 2364 * negotiation. 2365 */ 2366 static void 2367 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2368 { 2369 STDDCL; 2370 u_char *buf, *p; 2371 2372 len -= 4; 2373 buf = malloc (len, M_TEMP, M_NOWAIT); 2374 if (!buf) 2375 return; 2376 2377 if (debug) 2378 log(LOG_DEBUG, "%s: lcp rej opts:", 2379 ifp->if_xname); 2380 2381 p = (void *)(h + 1); 2382 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2383 if (debug) 2384 addlog(" %s", sppp_lcp_opt_name(*p)); 2385 switch (*p) { 2386 case LCP_OPT_MAGIC: 2387 /* Magic number -- can't use it, use 0 */ 2388 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2389 sp->lcp.magic = 0; 2390 break; 2391 case LCP_OPT_MRU: 2392 /* 2393 * Should not be rejected anyway, since we only 2394 * negotiate a MRU if explicitly requested by 2395 * peer. 2396 */ 2397 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2398 break; 2399 case LCP_OPT_AUTH_PROTO: 2400 /* 2401 * Peer doesn't want to authenticate himself, 2402 * deny unless this is a dialout call, and 2403 * SPPP_AUTHFLAG_NOCALLOUT is set. 2404 */ 2405 if ((sp->pp_flags & PP_CALLIN) == 0 && 2406 (sp->hisauth.flags & SPPP_AUTHFLAG_NOCALLOUT) != 0) { 2407 if (debug) 2408 addlog(" [don't insist on auth " 2409 "for callout]"); 2410 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2411 break; 2412 } 2413 if (debug) 2414 addlog("[access denied]\n"); 2415 lcp.Close(sp); 2416 break; 2417 } 2418 } 2419 if (debug) 2420 addlog("\n"); 2421 free(buf, M_TEMP); 2422 return; 2423 } 2424 2425 /* 2426 * Analyze the LCP Configure-NAK option list, and adjust our 2427 * negotiation. 2428 */ 2429 static void 2430 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2431 { 2432 STDDCL; 2433 u_char *buf, *p; 2434 u_int32_t magic; 2435 2436 len -= 4; 2437 buf = malloc (len, M_TEMP, M_NOWAIT); 2438 if (!buf) 2439 return; 2440 2441 if (debug) 2442 log(LOG_DEBUG, "%s: lcp nak opts:", 2443 ifp->if_xname); 2444 2445 p = (void *)(h + 1); 2446 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2447 if (debug) 2448 addlog(" %s", sppp_lcp_opt_name(*p)); 2449 switch (*p) { 2450 case LCP_OPT_MAGIC: 2451 /* Magic number -- renegotiate */ 2452 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2453 len >= 6 && p[1] == 6) { 2454 magic = (u_int32_t)p[2] << 24 | 2455 (u_int32_t)p[3] << 16 | p[4] << 8 | p[5]; 2456 /* 2457 * If the remote magic is our negated one, 2458 * this looks like a loopback problem. 2459 * Suggest a new magic to make sure. 2460 */ 2461 if (magic == ~sp->lcp.magic) { 2462 if (debug) 2463 addlog(" magic glitch"); 2464 sp->lcp.magic = arc4random(); 2465 } else { 2466 sp->lcp.magic = magic; 2467 if (debug) 2468 addlog(" %d", magic); 2469 } 2470 } 2471 break; 2472 case LCP_OPT_MRU: 2473 /* 2474 * Peer wants to advise us to negotiate an MRU. 2475 * Agree on it if it's reasonable, or use 2476 * default otherwise. 2477 */ 2478 if (len >= 4 && p[1] == 4) { 2479 u_int mru = p[2] * 256 + p[3]; 2480 if (debug) 2481 addlog(" %d", mru); 2482 if (mru < PP_MTU || mru > PP_MAX_MRU) 2483 mru = PP_MTU; 2484 sp->lcp.mru = mru; 2485 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2486 } 2487 break; 2488 case LCP_OPT_AUTH_PROTO: 2489 /* 2490 * Peer doesn't like our authentication method, 2491 * deny. 2492 */ 2493 if (debug) 2494 addlog("[access denied]\n"); 2495 lcp.Close(sp); 2496 break; 2497 } 2498 } 2499 if (debug) 2500 addlog("\n"); 2501 free(buf, M_TEMP); 2502 return; 2503 } 2504 2505 static void 2506 sppp_lcp_tlu(struct sppp *sp) 2507 { 2508 STDDCL; 2509 int i; 2510 u_int32_t mask; 2511 2512 /* XXX ? */ 2513 if (! (ifp->if_flags & IFF_UP) && 2514 (ifp->if_flags & IFF_RUNNING)) { 2515 /* Coming out of loopback mode. */ 2516 if_up(ifp); 2517 } 2518 2519 for (i = 0; i < IDX_COUNT; i++) 2520 if ((cps[i])->flags & CP_QUAL) 2521 (cps[i])->Open(sp); 2522 2523 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2524 (sp->pp_flags & PP_NEEDAUTH) != 0) 2525 sp->pp_phase = SPPP_PHASE_AUTHENTICATE; 2526 else 2527 sp->pp_phase = SPPP_PHASE_NETWORK; 2528 2529 if(debug) 2530 { 2531 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2532 sppp_phase_name(sp->pp_phase)); 2533 } 2534 2535 /* 2536 * Open all authentication protocols. This is even required 2537 * if we already proceeded to network phase, since it might be 2538 * that remote wants us to authenticate, so we might have to 2539 * send a PAP request. Undesired authentication protocols 2540 * don't do anything when they get an Open event. 2541 */ 2542 for (i = 0; i < IDX_COUNT; i++) 2543 if ((cps[i])->flags & CP_AUTH) 2544 (cps[i])->Open(sp); 2545 2546 if (sp->pp_phase == SPPP_PHASE_NETWORK) { 2547 /* Notify all NCPs. */ 2548 for (i = 0; i < IDX_COUNT; i++) 2549 if ((cps[i])->flags & CP_NCP) 2550 (cps[i])->Open(sp); 2551 } 2552 2553 /* Send Up events to all started protos. */ 2554 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2555 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2556 (cps[i])->Up(sp); 2557 2558 /* notify low-level driver of state change */ 2559 if (sp->pp_chg) 2560 sp->pp_chg(sp, (int)sp->pp_phase); 2561 2562 if (sp->pp_phase == SPPP_PHASE_NETWORK) 2563 /* if no NCP is starting, close down */ 2564 sppp_lcp_check_and_close(sp); 2565 } 2566 2567 static void 2568 sppp_lcp_tld(struct sppp *sp) 2569 { 2570 STDDCL; 2571 int i; 2572 u_int32_t mask; 2573 2574 sp->pp_phase = SPPP_PHASE_TERMINATE; 2575 2576 if(debug) 2577 { 2578 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2579 sppp_phase_name(sp->pp_phase)); 2580 } 2581 2582 /* 2583 * Take upper layers down. We send the Down event first and 2584 * the Close second to prevent the upper layers from sending 2585 * ``a flurry of terminate-request packets'', as the RFC 2586 * describes it. 2587 */ 2588 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2589 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2590 (cps[i])->Down(sp); 2591 (cps[i])->Close(sp); 2592 } 2593 } 2594 2595 static void 2596 sppp_lcp_tls(struct sppp *sp) 2597 { 2598 STDDCL; 2599 2600 if (sp->pp_max_auth_fail != 0 && sp->pp_auth_failures >= sp->pp_max_auth_fail) { 2601 printf("%s: authentication failed %d times, not retrying again\n", 2602 sp->pp_if.if_xname, sp->pp_auth_failures); 2603 if_down(&sp->pp_if); 2604 return; 2605 } 2606 2607 sp->pp_phase = SPPP_PHASE_ESTABLISH; 2608 2609 if(debug) 2610 { 2611 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2612 sppp_phase_name(sp->pp_phase)); 2613 } 2614 2615 /* Notify lower layer if desired. */ 2616 if (sp->pp_tls) 2617 (sp->pp_tls)(sp); 2618 } 2619 2620 static void 2621 sppp_lcp_tlf(struct sppp *sp) 2622 { 2623 STDDCL; 2624 2625 sp->pp_phase = SPPP_PHASE_DEAD; 2626 2627 if(debug) 2628 { 2629 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 2630 sppp_phase_name(sp->pp_phase)); 2631 } 2632 2633 /* Notify lower layer if desired. */ 2634 if (sp->pp_tlf) 2635 (sp->pp_tlf)(sp); 2636 } 2637 2638 static void 2639 sppp_lcp_scr(struct sppp *sp) 2640 { 2641 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2642 int i = 0; 2643 u_short authproto; 2644 2645 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2646 if (! sp->lcp.magic) 2647 sp->lcp.magic = arc4random(); 2648 opt[i++] = LCP_OPT_MAGIC; 2649 opt[i++] = 6; 2650 opt[i++] = sp->lcp.magic >> 24; 2651 opt[i++] = sp->lcp.magic >> 16; 2652 opt[i++] = sp->lcp.magic >> 8; 2653 opt[i++] = sp->lcp.magic; 2654 } 2655 2656 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2657 opt[i++] = LCP_OPT_MRU; 2658 opt[i++] = 4; 2659 opt[i++] = sp->lcp.mru >> 8; 2660 opt[i++] = sp->lcp.mru; 2661 } 2662 2663 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2664 authproto = sp->hisauth.proto; 2665 opt[i++] = LCP_OPT_AUTH_PROTO; 2666 opt[i++] = authproto == PPP_CHAP? 5: 4; 2667 opt[i++] = authproto >> 8; 2668 opt[i++] = authproto; 2669 if (authproto == PPP_CHAP) 2670 opt[i++] = CHAP_MD5; 2671 } 2672 2673 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2674 sppp_cp_send(sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2675 } 2676 2677 /* 2678 * Check the open NCPs, return true if at least one NCP is open. 2679 */ 2680 static int 2681 sppp_ncp_check(struct sppp *sp) 2682 { 2683 int i, mask; 2684 2685 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2686 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2687 return 1; 2688 return 0; 2689 } 2690 2691 /* 2692 * Re-check the open NCPs and see if we should terminate the link. 2693 * Called by the NCPs during their tlf action handling. 2694 */ 2695 static void 2696 sppp_lcp_check_and_close(struct sppp *sp) 2697 { 2698 2699 if (sp->pp_phase < SPPP_PHASE_NETWORK) 2700 /* don't bother, we are already going down */ 2701 return; 2702 2703 if (sppp_ncp_check(sp)) 2704 return; 2705 2706 lcp.Close(sp); 2707 } 2708 2709 2710 /* 2711 *--------------------------------------------------------------------------* 2712 * * 2713 * The IPCP implementation. * 2714 * * 2715 *--------------------------------------------------------------------------* 2716 */ 2717 2718 static void 2719 sppp_ipcp_init(struct sppp *sp) 2720 { 2721 sp->ipcp.opts = 0; 2722 sp->ipcp.flags = 0; 2723 sp->state[IDX_IPCP] = STATE_INITIAL; 2724 sp->fail_counter[IDX_IPCP] = 0; 2725 sp->pp_seq[IDX_IPCP] = 0; 2726 sp->pp_rseq[IDX_IPCP] = 0; 2727 callout_init(&sp->ch[IDX_IPCP]); 2728 } 2729 2730 static void 2731 sppp_ipcp_up(struct sppp *sp) 2732 { 2733 sppp_up_event(&ipcp, sp); 2734 } 2735 2736 static void 2737 sppp_ipcp_down(struct sppp *sp) 2738 { 2739 sppp_down_event(&ipcp, sp); 2740 } 2741 2742 static void 2743 sppp_ipcp_open(struct sppp *sp) 2744 { 2745 STDDCL; 2746 u_int32_t myaddr, hisaddr; 2747 2748 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN|IPCP_HISADDR_DYN); 2749 sp->ipcp.req_myaddr = 0; 2750 sp->ipcp.req_hisaddr = 0; 2751 memset(&sp->dns_addrs, 0, sizeof sp->dns_addrs); 2752 2753 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2754 /* 2755 * If we don't have his address, this probably means our 2756 * interface doesn't want to talk IP at all. (This could 2757 * be the case if somebody wants to speak only IPX, for 2758 * example.) Don't open IPCP in this case. 2759 */ 2760 if (hisaddr == 0L) { 2761 /* XXX this message should go away */ 2762 if (debug) 2763 log(LOG_DEBUG, "%s: ipcp_open(): no IP interface\n", 2764 ifp->if_xname); 2765 return; 2766 } 2767 2768 if (myaddr == 0) { 2769 /* 2770 * I don't have an assigned address, so i need to 2771 * negotiate my address. 2772 */ 2773 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2774 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2775 } 2776 if (hisaddr == 1) { 2777 /* 2778 * XXX - remove this hack! 2779 * remote has no valid adress, we need to get one assigned. 2780 */ 2781 sp->ipcp.flags |= IPCP_HISADDR_DYN; 2782 } 2783 sppp_open_event(&ipcp, sp); 2784 } 2785 2786 static void 2787 sppp_ipcp_close(struct sppp *sp) 2788 { 2789 STDDCL; 2790 2791 sppp_close_event(&ipcp, sp); 2792 if (sp->ipcp.flags & (IPCP_MYADDR_DYN|IPCP_HISADDR_DYN)) 2793 /* 2794 * Some address was dynamic, clear it again. 2795 */ 2796 sppp_clear_ip_addrs(sp); 2797 2798 if (sp->pp_saved_mtu > 0) { 2799 ifp->if_mtu = sp->pp_saved_mtu; 2800 sp->pp_saved_mtu = 0; 2801 if (debug) 2802 log(LOG_DEBUG, 2803 "%s: resetting MTU to %" PRIu64 " bytes\n", 2804 ifp->if_xname, ifp->if_mtu); 2805 } 2806 } 2807 2808 static void 2809 sppp_ipcp_TO(void *cookie) 2810 { 2811 sppp_to_event(&ipcp, (struct sppp *)cookie); 2812 } 2813 2814 /* 2815 * Analyze a configure request. Return true if it was agreeable, and 2816 * caused action sca, false if it has been rejected or nak'ed, and 2817 * caused action scn. (The return value is used to make the state 2818 * transition decision in the state automaton.) 2819 */ 2820 static int 2821 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2822 { 2823 u_char *buf, *r, *p; 2824 struct ifnet *ifp = &sp->pp_if; 2825 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2826 u_int32_t hisaddr, desiredaddr; 2827 2828 len -= 4; 2829 origlen = len; 2830 /* 2831 * Make sure to allocate a buf that can at least hold a 2832 * conf-nak with an `address' option. We might need it below. 2833 */ 2834 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2835 if (! buf) 2836 return (0); 2837 2838 /* pass 1: see if we can recognize them */ 2839 if (debug) 2840 log(LOG_DEBUG, "%s: ipcp parse opts:", 2841 ifp->if_xname); 2842 p = (void *)(h + 1); 2843 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2844 if (debug) 2845 addlog(" %s", sppp_ipcp_opt_name(*p)); 2846 switch (*p) { 2847 #ifdef notyet 2848 case IPCP_OPT_COMPRESSION: 2849 if (len >= 6 && p[1] >= 6) { 2850 /* correctly formed compress option */ 2851 continue; 2852 } 2853 if (debug) 2854 addlog(" [invalid]"); 2855 break; 2856 #endif 2857 case IPCP_OPT_ADDRESS: 2858 if (len >= 6 && p[1] == 6) { 2859 /* correctly formed address option */ 2860 continue; 2861 } 2862 if (debug) 2863 addlog(" [invalid]"); 2864 break; 2865 default: 2866 /* Others not supported. */ 2867 if (debug) 2868 addlog(" [rej]"); 2869 break; 2870 } 2871 /* Add the option to rejected list. */ 2872 bcopy (p, r, p[1]); 2873 r += p[1]; 2874 rlen += p[1]; 2875 } 2876 if (rlen) { 2877 if (debug) 2878 addlog(" send conf-rej\n"); 2879 sppp_cp_send(sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2880 goto end; 2881 } else if (debug) 2882 addlog("\n"); 2883 2884 /* pass 2: parse option values */ 2885 if (sp->ipcp.flags & IPCP_HISADDR_SEEN) 2886 hisaddr = sp->ipcp.req_hisaddr; /* we already aggreed on that */ 2887 else 2888 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); /* user configuration */ 2889 if (debug) 2890 log(LOG_DEBUG, "%s: ipcp parse opt values: ", 2891 ifp->if_xname); 2892 p = (void *)(h + 1); 2893 len = origlen; 2894 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2895 if (debug) 2896 addlog(" %s", sppp_ipcp_opt_name(*p)); 2897 switch (*p) { 2898 #ifdef notyet 2899 case IPCP_OPT_COMPRESSION: 2900 continue; 2901 #endif 2902 case IPCP_OPT_ADDRESS: 2903 desiredaddr = p[2] << 24 | p[3] << 16 | 2904 p[4] << 8 | p[5]; 2905 if (desiredaddr == hisaddr || 2906 ((sp->ipcp.flags & IPCP_HISADDR_DYN) && desiredaddr != 0)) { 2907 /* 2908 * Peer's address is same as our value, 2909 * this is agreeable. Gonna conf-ack 2910 * it. 2911 */ 2912 if (debug) 2913 addlog(" %s [ack]", 2914 sppp_dotted_quad(hisaddr)); 2915 /* record that we've seen it already */ 2916 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2917 sp->ipcp.req_hisaddr = desiredaddr; 2918 hisaddr = desiredaddr; 2919 continue; 2920 } 2921 /* 2922 * The address wasn't agreeable. This is either 2923 * he sent us 0.0.0.0, asking to assign him an 2924 * address, or he send us another address not 2925 * matching our value. Either case, we gonna 2926 * conf-nak it with our value. 2927 */ 2928 if (debug) { 2929 if (desiredaddr == 0) 2930 addlog(" [addr requested]"); 2931 else 2932 addlog(" %s [not agreed]", 2933 sppp_dotted_quad(desiredaddr)); 2934 } 2935 2936 p[2] = hisaddr >> 24; 2937 p[3] = hisaddr >> 16; 2938 p[4] = hisaddr >> 8; 2939 p[5] = hisaddr; 2940 break; 2941 } 2942 /* Add the option to nak'ed list. */ 2943 bcopy (p, r, p[1]); 2944 r += p[1]; 2945 rlen += p[1]; 2946 } 2947 2948 /* 2949 * If we are about to conf-ack the request, but haven't seen 2950 * his address so far, gonna conf-nak it instead, with the 2951 * `address' option present and our idea of his address being 2952 * filled in there, to request negotiation of both addresses. 2953 * 2954 * XXX This can result in an endless req - nak loop if peer 2955 * doesn't want to send us his address. Q: What should we do 2956 * about it? XXX A: implement the max-failure counter. 2957 */ 2958 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN)) { 2959 buf[0] = IPCP_OPT_ADDRESS; 2960 buf[1] = 6; 2961 buf[2] = hisaddr >> 24; 2962 buf[3] = hisaddr >> 16; 2963 buf[4] = hisaddr >> 8; 2964 buf[5] = hisaddr; 2965 rlen = 6; 2966 if (debug) 2967 addlog(" still need hisaddr"); 2968 } 2969 2970 if (rlen) { 2971 if (debug) 2972 addlog(" send conf-nak\n"); 2973 sppp_cp_send(sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2974 } else { 2975 if (debug) 2976 addlog(" send conf-ack\n"); 2977 sppp_cp_send(sp, PPP_IPCP, CONF_ACK, h->ident, origlen, h + 1); 2978 } 2979 2980 end: 2981 free(buf, M_TEMP); 2982 return (rlen == 0); 2983 } 2984 2985 /* 2986 * Analyze the IPCP Configure-Reject option list, and adjust our 2987 * negotiation. 2988 */ 2989 static void 2990 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2991 { 2992 u_char *buf, *p; 2993 struct ifnet *ifp = &sp->pp_if; 2994 int debug = ifp->if_flags & IFF_DEBUG; 2995 2996 len -= 4; 2997 buf = malloc (len, M_TEMP, M_NOWAIT); 2998 if (!buf) 2999 return; 3000 3001 if (debug) 3002 log(LOG_DEBUG, "%s: ipcp rej opts:", 3003 ifp->if_xname); 3004 3005 p = (void *)(h + 1); 3006 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3007 if (debug) 3008 addlog(" %s", sppp_ipcp_opt_name(*p)); 3009 switch (*p) { 3010 case IPCP_OPT_ADDRESS: 3011 /* 3012 * Peer doesn't grok address option. This is 3013 * bad. XXX Should we better give up here? 3014 */ 3015 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3016 break; 3017 #ifdef notyet 3018 case IPCP_OPT_COMPRESS: 3019 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESS); 3020 break; 3021 #endif 3022 } 3023 } 3024 if (debug) 3025 addlog("\n"); 3026 free(buf, M_TEMP); 3027 return; 3028 } 3029 3030 /* 3031 * Analyze the IPCP Configure-NAK option list, and adjust our 3032 * negotiation. 3033 */ 3034 static void 3035 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3036 { 3037 u_char *p; 3038 struct ifnet *ifp = &sp->pp_if; 3039 int debug = ifp->if_flags & IFF_DEBUG; 3040 u_int32_t wantaddr; 3041 3042 len -= 4; 3043 3044 if (debug) 3045 log(LOG_DEBUG, "%s: ipcp nak opts:", 3046 ifp->if_xname); 3047 3048 p = (void *)(h + 1); 3049 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3050 if (debug) 3051 addlog(" %s", sppp_ipcp_opt_name(*p)); 3052 switch (*p) { 3053 case IPCP_OPT_ADDRESS: 3054 /* 3055 * Peer doesn't like our local IP address. See 3056 * if we can do something for him. We'll drop 3057 * him our address then. 3058 */ 3059 if (len >= 6 && p[1] == 6) { 3060 wantaddr = p[2] << 24 | p[3] << 16 | 3061 p[4] << 8 | p[5]; 3062 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3063 if (debug) 3064 addlog(" [wantaddr %s]", 3065 sppp_dotted_quad(wantaddr)); 3066 /* 3067 * When doing dynamic address assignment, 3068 * we accept his offer. Otherwise, we 3069 * ignore it and thus continue to negotiate 3070 * our already existing value. 3071 */ 3072 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3073 if (debug) 3074 addlog(" [agree]"); 3075 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3076 sp->ipcp.req_myaddr = wantaddr; 3077 } 3078 } 3079 break; 3080 3081 case IPCP_OPT_PRIMDNS: 3082 if (len >= 6 && p[1] == 6) { 3083 sp->dns_addrs[0] = p[2] << 24 | p[3] << 16 | 3084 p[4] << 8 | p[5]; 3085 } 3086 break; 3087 3088 case IPCP_OPT_SECDNS: 3089 if (len >= 6 && p[1] == 6) { 3090 sp->dns_addrs[1] = p[2] << 24 | p[3] << 16 | 3091 p[4] << 8 | p[5]; 3092 } 3093 break; 3094 #ifdef notyet 3095 case IPCP_OPT_COMPRESS: 3096 /* 3097 * Peer wants different compression parameters. 3098 */ 3099 break; 3100 #endif 3101 } 3102 } 3103 if (debug) 3104 addlog("\n"); 3105 return; 3106 } 3107 3108 static void 3109 sppp_ipcp_tlu(struct sppp *sp) 3110 { 3111 /* we are up. Set addresses and notify anyone interested */ 3112 STDDCL; 3113 u_int32_t myaddr, hisaddr; 3114 3115 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 3116 if ((sp->ipcp.flags & IPCP_MYADDR_DYN) && (sp->ipcp.flags & IPCP_MYADDR_SEEN)) 3117 myaddr = sp->ipcp.req_myaddr; 3118 if ((sp->ipcp.flags & IPCP_HISADDR_DYN) && (sp->ipcp.flags & IPCP_HISADDR_SEEN)) 3119 hisaddr = sp->ipcp.req_hisaddr; 3120 sppp_set_ip_addrs(sp, myaddr, hisaddr); 3121 3122 if (ifp->if_mtu > sp->lcp.their_mru) { 3123 sp->pp_saved_mtu = ifp->if_mtu; 3124 ifp->if_mtu = sp->lcp.their_mru; 3125 if (debug) 3126 log(LOG_DEBUG, 3127 "%s: setting MTU to %" PRIu64 " bytes\n", 3128 ifp->if_xname, ifp->if_mtu); 3129 } 3130 3131 if (sp->pp_con) 3132 sp->pp_con(sp); 3133 } 3134 3135 static void 3136 sppp_ipcp_tld(struct sppp *sp) 3137 { 3138 } 3139 3140 static void 3141 sppp_ipcp_tls(struct sppp *sp) 3142 { 3143 /* indicate to LCP that it must stay alive */ 3144 sp->lcp.protos |= (1 << IDX_IPCP); 3145 } 3146 3147 static void 3148 sppp_ipcp_tlf(struct sppp *sp) 3149 { 3150 /* we no longer need LCP */ 3151 sp->lcp.protos &= ~(1 << IDX_IPCP); 3152 } 3153 3154 static void 3155 sppp_ipcp_scr(struct sppp *sp) 3156 { 3157 char opt[6 /* compression */ + 6 /* address */ + 12 /* dns addresses */]; 3158 u_int32_t ouraddr; 3159 int i = 0; 3160 3161 #ifdef notyet 3162 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3163 opt[i++] = IPCP_OPT_COMPRESSION; 3164 opt[i++] = 6; 3165 opt[i++] = 0; /* VJ header compression */ 3166 opt[i++] = 0x2d; /* VJ header compression */ 3167 opt[i++] = max_slot_id; 3168 opt[i++] = comp_slot_id; 3169 } 3170 #endif 3171 3172 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3173 if (sp->ipcp.flags & IPCP_MYADDR_SEEN) 3174 ouraddr = sp->ipcp.req_myaddr; /* not sure if this can ever happen */ 3175 else 3176 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3177 opt[i++] = IPCP_OPT_ADDRESS; 3178 opt[i++] = 6; 3179 opt[i++] = ouraddr >> 24; 3180 opt[i++] = ouraddr >> 16; 3181 opt[i++] = ouraddr >> 8; 3182 opt[i++] = ouraddr; 3183 } 3184 3185 if (sp->query_dns & 1) { 3186 opt[i++] = IPCP_OPT_PRIMDNS; 3187 opt[i++] = 6; 3188 opt[i++] = sp->dns_addrs[0] >> 24; 3189 opt[i++] = sp->dns_addrs[0] >> 16; 3190 opt[i++] = sp->dns_addrs[0] >> 8; 3191 opt[i++] = sp->dns_addrs[0]; 3192 } 3193 if (sp->query_dns & 2) { 3194 opt[i++] = IPCP_OPT_SECDNS; 3195 opt[i++] = 6; 3196 opt[i++] = sp->dns_addrs[1] >> 24; 3197 opt[i++] = sp->dns_addrs[1] >> 16; 3198 opt[i++] = sp->dns_addrs[1] >> 8; 3199 opt[i++] = sp->dns_addrs[1]; 3200 } 3201 3202 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3203 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3204 } 3205 3206 3207 /* 3208 *--------------------------------------------------------------------------* 3209 * * 3210 * The IPv6CP implementation. * 3211 * * 3212 *--------------------------------------------------------------------------* 3213 */ 3214 3215 #ifdef INET6 3216 static void 3217 sppp_ipv6cp_init(struct sppp *sp) 3218 { 3219 sp->ipv6cp.opts = 0; 3220 sp->ipv6cp.flags = 0; 3221 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3222 sp->fail_counter[IDX_IPV6CP] = 0; 3223 sp->pp_seq[IDX_IPV6CP] = 0; 3224 sp->pp_rseq[IDX_IPV6CP] = 0; 3225 callout_init(&sp->ch[IDX_IPV6CP]); 3226 } 3227 3228 static void 3229 sppp_ipv6cp_up(struct sppp *sp) 3230 { 3231 sppp_up_event(&ipv6cp, sp); 3232 } 3233 3234 static void 3235 sppp_ipv6cp_down(struct sppp *sp) 3236 { 3237 sppp_down_event(&ipv6cp, sp); 3238 } 3239 3240 static void 3241 sppp_ipv6cp_open(struct sppp *sp) 3242 { 3243 STDDCL; 3244 struct in6_addr myaddr, hisaddr; 3245 3246 #ifdef IPV6CP_MYIFID_DYN 3247 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3248 #else 3249 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3250 #endif 3251 3252 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3253 /* 3254 * If we don't have our address, this probably means our 3255 * interface doesn't want to talk IPv6 at all. (This could 3256 * be the case if somebody wants to speak only IPX, for 3257 * example.) Don't open IPv6CP in this case. 3258 */ 3259 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3260 /* XXX this message should go away */ 3261 if (debug) 3262 log(LOG_DEBUG, "%s: ipv6cp_open(): no IPv6 interface\n", 3263 ifp->if_xname); 3264 return; 3265 } 3266 3267 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3268 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3269 sppp_open_event(&ipv6cp, sp); 3270 } 3271 3272 static void 3273 sppp_ipv6cp_close(struct sppp *sp) 3274 { 3275 sppp_close_event(&ipv6cp, sp); 3276 } 3277 3278 static void 3279 sppp_ipv6cp_TO(void *cookie) 3280 { 3281 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3282 } 3283 3284 /* 3285 * Analyze a configure request. Return true if it was agreeable, and 3286 * caused action sca, false if it has been rejected or nak'ed, and 3287 * caused action scn. (The return value is used to make the state 3288 * transition decision in the state automaton.) 3289 */ 3290 static int 3291 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3292 { 3293 u_char *buf, *r, *p; 3294 struct ifnet *ifp = &sp->pp_if; 3295 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3296 struct in6_addr myaddr, desiredaddr, suggestaddr; 3297 int ifidcount; 3298 int type; 3299 int collision, nohisaddr; 3300 3301 len -= 4; 3302 origlen = len; 3303 /* 3304 * Make sure to allocate a buf that can at least hold a 3305 * conf-nak with an `address' option. We might need it below. 3306 */ 3307 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3308 if (! buf) 3309 return (0); 3310 3311 /* pass 1: see if we can recognize them */ 3312 if (debug) 3313 log(LOG_DEBUG, "%s: ipv6cp parse opts:", 3314 ifp->if_xname); 3315 p = (void *)(h + 1); 3316 ifidcount = 0; 3317 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3318 if (debug) 3319 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3320 switch (*p) { 3321 case IPV6CP_OPT_IFID: 3322 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3323 /* correctly formed address option */ 3324 ifidcount++; 3325 continue; 3326 } 3327 if (debug) 3328 addlog(" [invalid]"); 3329 break; 3330 #ifdef notyet 3331 case IPV6CP_OPT_COMPRESSION: 3332 if (len >= 4 && p[1] >= 4) { 3333 /* correctly formed compress option */ 3334 continue; 3335 } 3336 if (debug) 3337 addlog(" [invalid]"); 3338 break; 3339 #endif 3340 default: 3341 /* Others not supported. */ 3342 if (debug) 3343 addlog(" [rej]"); 3344 break; 3345 } 3346 /* Add the option to rejected list. */ 3347 bcopy (p, r, p[1]); 3348 r += p[1]; 3349 rlen += p[1]; 3350 } 3351 if (rlen) { 3352 if (debug) 3353 addlog(" send conf-rej\n"); 3354 sppp_cp_send(sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3355 goto end; 3356 } else if (debug) 3357 addlog("\n"); 3358 3359 /* pass 2: parse option values */ 3360 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3361 if (debug) 3362 log(LOG_DEBUG, "%s: ipv6cp parse opt values: ", 3363 ifp->if_xname); 3364 p = (void *)(h + 1); 3365 len = origlen; 3366 type = CONF_ACK; 3367 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3368 if (debug) 3369 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3370 switch (*p) { 3371 #ifdef notyet 3372 case IPV6CP_OPT_COMPRESSION: 3373 continue; 3374 #endif 3375 case IPV6CP_OPT_IFID: 3376 memset(&desiredaddr, 0, sizeof(desiredaddr)); 3377 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3378 collision = (memcmp(&desiredaddr.s6_addr[8], 3379 &myaddr.s6_addr[8], 8) == 0); 3380 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3381 3382 desiredaddr.s6_addr16[0] = htons(0xfe80); 3383 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3384 3385 if (!collision && !nohisaddr) { 3386 /* no collision, hisaddr known - Conf-Ack */ 3387 type = CONF_ACK; 3388 3389 if (debug) { 3390 addlog(" %s [%s]", 3391 ip6_sprintf(&desiredaddr), 3392 sppp_cp_type_name(type)); 3393 } 3394 continue; 3395 } 3396 3397 memset(&suggestaddr, 0, sizeof(&suggestaddr)); 3398 if (collision && nohisaddr) { 3399 /* collision, hisaddr unknown - Conf-Rej */ 3400 type = CONF_REJ; 3401 memset(&p[2], 0, 8); 3402 } else { 3403 /* 3404 * - no collision, hisaddr unknown, or 3405 * - collision, hisaddr known 3406 * Conf-Nak, suggest hisaddr 3407 */ 3408 type = CONF_NAK; 3409 sppp_suggest_ip6_addr(sp, &suggestaddr); 3410 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3411 } 3412 if (debug) 3413 addlog(" %s [%s]", ip6_sprintf(&desiredaddr), 3414 sppp_cp_type_name(type)); 3415 break; 3416 } 3417 /* Add the option to nak'ed list. */ 3418 bcopy (p, r, p[1]); 3419 r += p[1]; 3420 rlen += p[1]; 3421 } 3422 3423 if (rlen == 0 && type == CONF_ACK) { 3424 if (debug) 3425 addlog(" send %s\n", sppp_cp_type_name(type)); 3426 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, origlen, h + 1); 3427 } else { 3428 #ifdef notdef 3429 if (type == CONF_ACK) 3430 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3431 #endif 3432 3433 if (debug) { 3434 addlog(" send %s suggest %s\n", 3435 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3436 } 3437 sppp_cp_send(sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3438 } 3439 3440 end: 3441 free(buf, M_TEMP); 3442 return (rlen == 0); 3443 } 3444 3445 /* 3446 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3447 * negotiation. 3448 */ 3449 static void 3450 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3451 { 3452 u_char *buf, *p; 3453 struct ifnet *ifp = &sp->pp_if; 3454 int debug = ifp->if_flags & IFF_DEBUG; 3455 3456 len -= 4; 3457 buf = malloc (len, M_TEMP, M_NOWAIT); 3458 if (!buf) 3459 return; 3460 3461 if (debug) 3462 log(LOG_DEBUG, "%s: ipv6cp rej opts:", 3463 ifp->if_xname); 3464 3465 p = (void *)(h + 1); 3466 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3467 if (debug) 3468 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3469 switch (*p) { 3470 case IPV6CP_OPT_IFID: 3471 /* 3472 * Peer doesn't grok address option. This is 3473 * bad. XXX Should we better give up here? 3474 */ 3475 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3476 break; 3477 #ifdef notyet 3478 case IPV6CP_OPT_COMPRESS: 3479 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3480 break; 3481 #endif 3482 } 3483 } 3484 if (debug) 3485 addlog("\n"); 3486 free(buf, M_TEMP); 3487 return; 3488 } 3489 3490 /* 3491 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3492 * negotiation. 3493 */ 3494 static void 3495 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3496 { 3497 u_char *buf, *p; 3498 struct ifnet *ifp = &sp->pp_if; 3499 int debug = ifp->if_flags & IFF_DEBUG; 3500 struct in6_addr suggestaddr; 3501 3502 len -= 4; 3503 buf = malloc (len, M_TEMP, M_NOWAIT); 3504 if (!buf) 3505 return; 3506 3507 if (debug) 3508 log(LOG_DEBUG, "%s: ipv6cp nak opts:", 3509 ifp->if_xname); 3510 3511 p = (void *)(h + 1); 3512 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3513 if (debug) 3514 addlog(" %s", sppp_ipv6cp_opt_name(*p)); 3515 switch (*p) { 3516 case IPV6CP_OPT_IFID: 3517 /* 3518 * Peer doesn't like our local ifid. See 3519 * if we can do something for him. We'll drop 3520 * him our address then. 3521 */ 3522 if (len < 10 || p[1] != 10) 3523 break; 3524 memset(&suggestaddr, 0, sizeof(suggestaddr)); 3525 suggestaddr.s6_addr16[0] = htons(0xfe80); 3526 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3527 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3528 3529 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3530 if (debug) 3531 addlog(" [suggestaddr %s]", 3532 ip6_sprintf(&suggestaddr)); 3533 #ifdef IPV6CP_MYIFID_DYN 3534 /* 3535 * When doing dynamic address assignment, 3536 * we accept his offer. 3537 */ 3538 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3539 struct in6_addr lastsuggest; 3540 /* 3541 * If <suggested myaddr from peer> equals to 3542 * <hisaddr we have suggested last time>, 3543 * we have a collision. generate new random 3544 * ifid. 3545 */ 3546 sppp_suggest_ip6_addr(&lastsuggest); 3547 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3548 lastsuggest)) { 3549 if (debug) 3550 addlog(" [random]"); 3551 sppp_gen_ip6_addr(sp, &suggestaddr); 3552 } 3553 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3554 if (debug) 3555 addlog(" [agree]"); 3556 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3557 } 3558 #else 3559 /* 3560 * Since we do not do dynamic address assignment, 3561 * we ignore it and thus continue to negotiate 3562 * our already existing value. This can possibly 3563 * go into infinite request-reject loop. 3564 * 3565 * This is not likely because we normally use 3566 * ifid based on MAC-address. 3567 * If you have no ethernet card on the node, too bad. 3568 * XXX should we use fail_counter? 3569 */ 3570 #endif 3571 break; 3572 #ifdef notyet 3573 case IPV6CP_OPT_COMPRESS: 3574 /* 3575 * Peer wants different compression parameters. 3576 */ 3577 break; 3578 #endif 3579 } 3580 } 3581 if (debug) 3582 addlog("\n"); 3583 free(buf, M_TEMP); 3584 return; 3585 } 3586 3587 static void 3588 sppp_ipv6cp_tlu(struct sppp *sp) 3589 { 3590 /* we are up - notify isdn daemon */ 3591 if (sp->pp_con) 3592 sp->pp_con(sp); 3593 } 3594 3595 static void 3596 sppp_ipv6cp_tld(struct sppp *sp) 3597 { 3598 } 3599 3600 static void 3601 sppp_ipv6cp_tls(struct sppp *sp) 3602 { 3603 /* indicate to LCP that it must stay alive */ 3604 sp->lcp.protos |= (1 << IDX_IPV6CP); 3605 } 3606 3607 static void 3608 sppp_ipv6cp_tlf(struct sppp *sp) 3609 { 3610 /* we no longer need LCP */ 3611 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3612 } 3613 3614 static void 3615 sppp_ipv6cp_scr(struct sppp *sp) 3616 { 3617 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3618 struct in6_addr ouraddr; 3619 int i = 0; 3620 3621 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3622 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3623 opt[i++] = IPV6CP_OPT_IFID; 3624 opt[i++] = 10; 3625 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3626 i += 8; 3627 } 3628 3629 #ifdef notyet 3630 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3631 opt[i++] = IPV6CP_OPT_COMPRESSION; 3632 opt[i++] = 4; 3633 opt[i++] = 0; /* TBD */ 3634 opt[i++] = 0; /* TBD */ 3635 /* variable length data may follow */ 3636 } 3637 #endif 3638 3639 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3640 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3641 } 3642 #else /*INET6*/ 3643 static void sppp_ipv6cp_init(struct sppp *sp) 3644 { 3645 } 3646 3647 static void sppp_ipv6cp_up(struct sppp *sp) 3648 { 3649 } 3650 3651 static void sppp_ipv6cp_down(struct sppp *sp) 3652 { 3653 } 3654 3655 3656 static void sppp_ipv6cp_open(struct sppp *sp) 3657 { 3658 } 3659 3660 static void sppp_ipv6cp_close(struct sppp *sp) 3661 { 3662 } 3663 3664 static void sppp_ipv6cp_TO(void *sp) 3665 { 3666 } 3667 3668 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3669 { 3670 return 0; 3671 } 3672 3673 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3674 { 3675 } 3676 3677 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3678 { 3679 } 3680 3681 static void sppp_ipv6cp_tlu(struct sppp *sp) 3682 { 3683 } 3684 3685 static void sppp_ipv6cp_tld(struct sppp *sp) 3686 { 3687 } 3688 3689 static void sppp_ipv6cp_tls(struct sppp *sp) 3690 { 3691 } 3692 3693 static void sppp_ipv6cp_tlf(struct sppp *sp) 3694 { 3695 } 3696 3697 static void sppp_ipv6cp_scr(struct sppp *sp) 3698 { 3699 } 3700 #endif /*INET6*/ 3701 3702 3703 /* 3704 *--------------------------------------------------------------------------* 3705 * * 3706 * The CHAP implementation. * 3707 * * 3708 *--------------------------------------------------------------------------* 3709 */ 3710 3711 /* 3712 * The authentication protocols don't employ a full-fledged state machine as 3713 * the control protocols do, since they do have Open and Close events, but 3714 * not Up and Down, nor are they explicitly terminated. Also, use of the 3715 * authentication protocols may be different in both directions (this makes 3716 * sense, think of a machine that never accepts incoming calls but only 3717 * calls out, it doesn't require the called party to authenticate itself). 3718 * 3719 * Our state machine for the local authentication protocol (we are requesting 3720 * the peer to authenticate) looks like: 3721 * 3722 * RCA- 3723 * +--------------------------------------------+ 3724 * V scn,tld| 3725 * +--------+ Close +---------+ RCA+ 3726 * | |<----------------------------------| |------+ 3727 * +--->| Closed | TO* | Opened | sca | 3728 * | | |-----+ +-------| |<-----+ 3729 * | +--------+ irc | | +---------+ 3730 * | ^ | | ^ 3731 * | | | | | 3732 * | | | | | 3733 * | TO-| | | | 3734 * | |tld TO+ V | | 3735 * | | +------->+ | | 3736 * | | | | | | 3737 * | +--------+ V | | 3738 * | | |<----+<--------------------+ | 3739 * | | Req- | scr | 3740 * | | Sent | | 3741 * | | | | 3742 * | +--------+ | 3743 * | RCA- | | RCA+ | 3744 * +------+ +------------------------------------------+ 3745 * scn,tld sca,irc,ict,tlu 3746 * 3747 * 3748 * with: 3749 * 3750 * Open: LCP reached authentication phase 3751 * Close: LCP reached terminate phase 3752 * 3753 * RCA+: received reply (pap-req, chap-response), acceptable 3754 * RCN: received reply (pap-req, chap-response), not acceptable 3755 * TO+: timeout with restart counter >= 0 3756 * TO-: timeout with restart counter < 0 3757 * TO*: reschedule timeout for CHAP 3758 * 3759 * scr: send request packet (none for PAP, chap-challenge) 3760 * sca: send ack packet (pap-ack, chap-success) 3761 * scn: send nak packet (pap-nak, chap-failure) 3762 * ict: initialize re-challenge timer (CHAP only) 3763 * 3764 * tlu: this-layer-up, LCP reaches network phase 3765 * tld: this-layer-down, LCP enters terminate phase 3766 * 3767 * Note that in CHAP mode, after sending a new challenge, while the state 3768 * automaton falls back into Req-Sent state, it doesn't signal a tld 3769 * event to LCP, so LCP remains in network phase. Only after not getting 3770 * any response (or after getting an unacceptable response), CHAP closes, 3771 * causing LCP to enter terminate phase. 3772 * 3773 * With PAP, there is no initial request that can be sent. The peer is 3774 * expected to send one based on the successful negotiation of PAP as 3775 * the authentication protocol during the LCP option negotiation. 3776 * 3777 * Incoming authentication protocol requests (remote requests 3778 * authentication, we are peer) don't employ a state machine at all, 3779 * they are simply answered. Some peers [Ascend P50 firmware rev 3780 * 4.50] react allergically when sending IPCP/IPv6CP requests while they are 3781 * still in authentication phase (thereby violating the standard that 3782 * demands that these NCP packets are to be discarded), so we keep 3783 * track of the peer demanding us to authenticate, and only proceed to 3784 * phase network once we've seen a positive acknowledge for the 3785 * authentication. 3786 */ 3787 3788 /* 3789 * Handle incoming CHAP packets. 3790 */ 3791 void 3792 sppp_chap_input(struct sppp *sp, struct mbuf *m) 3793 { 3794 STDDCL; 3795 struct lcp_header *h; 3796 int len, x; 3797 u_char *value, *name, digest[sizeof(sp->myauth.challenge)], dsize; 3798 int value_len, name_len; 3799 MD5_CTX ctx; 3800 3801 len = m->m_pkthdr.len; 3802 if (len < 4) { 3803 if (debug) 3804 log(LOG_DEBUG, 3805 "%s: chap invalid packet length: %d bytes\n", 3806 ifp->if_xname, len); 3807 return; 3808 } 3809 h = mtod(m, struct lcp_header *); 3810 if (len > ntohs(h->len)) 3811 len = ntohs(h->len); 3812 3813 switch (h->type) { 3814 /* challenge, failure and success are his authproto */ 3815 case CHAP_CHALLENGE: 3816 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 3817 /* can't do anything usefull */ 3818 sp->pp_auth_failures++; 3819 printf("%s: chap input without my name and my secret being set\n", 3820 ifp->if_xname); 3821 break; 3822 } 3823 value = 1 + (u_char *)(h + 1); 3824 value_len = value[-1]; 3825 name = value + value_len; 3826 name_len = len - value_len - 5; 3827 if (name_len < 0) { 3828 if (debug) { 3829 log(LOG_DEBUG, 3830 "%s: chap corrupted challenge " 3831 "<%s id=0x%x len=%d", 3832 ifp->if_xname, 3833 sppp_auth_type_name(PPP_CHAP, h->type), 3834 h->ident, ntohs(h->len)); 3835 if (len > 4) 3836 sppp_print_bytes((u_char *)(h + 1), 3837 len - 4); 3838 addlog(">\n"); 3839 } 3840 break; 3841 } 3842 3843 if (debug) { 3844 log(LOG_DEBUG, 3845 "%s: chap input <%s id=0x%x len=%d name=", 3846 ifp->if_xname, 3847 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3848 ntohs(h->len)); 3849 sppp_print_string((char *) name, name_len); 3850 addlog(" value-size=%d value=", value_len); 3851 sppp_print_bytes(value, value_len); 3852 addlog(">\n"); 3853 } 3854 3855 /* Compute reply value. */ 3856 MD5Init(&ctx); 3857 MD5Update(&ctx, &h->ident, 1); 3858 MD5Update(&ctx, sp->myauth.secret, sp->myauth.secret_len); 3859 MD5Update(&ctx, value, value_len); 3860 MD5Final(digest, &ctx); 3861 dsize = sizeof digest; 3862 3863 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3864 sizeof dsize, (const char *)&dsize, 3865 sizeof digest, digest, 3866 sp->myauth.name_len, 3867 sp->myauth.name, 3868 0); 3869 break; 3870 3871 case CHAP_SUCCESS: 3872 if (debug) { 3873 log(LOG_DEBUG, "%s: chap success", 3874 ifp->if_xname); 3875 if (len > 4) { 3876 addlog(": "); 3877 sppp_print_string((char *)(h + 1), len - 4); 3878 } 3879 addlog("\n"); 3880 } 3881 x = splnet(); 3882 sp->pp_auth_failures = 0; 3883 sp->pp_flags &= ~PP_NEEDAUTH; 3884 if (sp->myauth.proto == PPP_CHAP && 3885 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3886 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3887 /* 3888 * We are authenticator for CHAP but didn't 3889 * complete yet. Leave it to tlu to proceed 3890 * to network phase. 3891 */ 3892 splx(x); 3893 break; 3894 } 3895 splx(x); 3896 sppp_phase_network(sp); 3897 break; 3898 3899 case CHAP_FAILURE: 3900 x = splnet(); 3901 sp->pp_auth_failures++; 3902 splx(x); 3903 if (debug) { 3904 log(LOG_INFO, "%s: chap failure", 3905 ifp->if_xname); 3906 if (len > 4) { 3907 addlog(": "); 3908 sppp_print_string((char *)(h + 1), len - 4); 3909 } 3910 addlog("\n"); 3911 } else 3912 log(LOG_INFO, "%s: chap failure\n", 3913 ifp->if_xname); 3914 /* await LCP shutdown by authenticator */ 3915 break; 3916 3917 /* response is my authproto */ 3918 case CHAP_RESPONSE: 3919 if (sp->hisauth.secret == NULL) { 3920 /* can't do anything usefull */ 3921 printf("%s: chap input without his secret being set\n", 3922 ifp->if_xname); 3923 break; 3924 } 3925 value = 1 + (u_char *)(h + 1); 3926 value_len = value[-1]; 3927 name = value + value_len; 3928 name_len = len - value_len - 5; 3929 if (name_len < 0) { 3930 if (debug) { 3931 log(LOG_DEBUG, 3932 "%s: chap corrupted response " 3933 "<%s id=0x%x len=%d", 3934 ifp->if_xname, 3935 sppp_auth_type_name(PPP_CHAP, h->type), 3936 h->ident, ntohs(h->len)); 3937 if (len > 4) 3938 sppp_print_bytes((u_char *)(h + 1), 3939 len - 4); 3940 addlog(">\n"); 3941 } 3942 break; 3943 } 3944 if (h->ident != sp->confid[IDX_CHAP]) { 3945 if (debug) 3946 log(LOG_DEBUG, 3947 "%s: chap dropping response for old ID " 3948 "(got %d, expected %d)\n", 3949 ifp->if_xname, 3950 h->ident, sp->confid[IDX_CHAP]); 3951 break; 3952 } 3953 if (sp->hisauth.name != NULL && 3954 (name_len != sp->hisauth.name_len 3955 || memcmp(name, sp->hisauth.name, name_len) != 0)) { 3956 log(LOG_INFO, "%s: chap response, his name ", 3957 ifp->if_xname); 3958 sppp_print_string(name, name_len); 3959 addlog(" != expected "); 3960 sppp_print_string(sp->hisauth.name, 3961 sp->hisauth.name_len); 3962 addlog("\n"); 3963 goto chap_failure; 3964 } 3965 if (debug) { 3966 log(LOG_DEBUG, "%s: chap input(%s) " 3967 "<%s id=0x%x len=%d name=", 3968 ifp->if_xname, 3969 sppp_state_name(sp->state[IDX_CHAP]), 3970 sppp_auth_type_name(PPP_CHAP, h->type), 3971 h->ident, ntohs(h->len)); 3972 sppp_print_string((char *)name, name_len); 3973 addlog(" value-size=%d value=", value_len); 3974 sppp_print_bytes(value, value_len); 3975 addlog(">\n"); 3976 } 3977 if (value_len != sizeof(sp->myauth.challenge)) { 3978 if (debug) 3979 log(LOG_DEBUG, 3980 "%s: chap bad hash value length: " 3981 "%d bytes, should be %ld\n", 3982 ifp->if_xname, value_len, 3983 (long) sizeof(sp->myauth.challenge)); 3984 goto chap_failure; 3985 } 3986 3987 MD5Init(&ctx); 3988 MD5Update(&ctx, &h->ident, 1); 3989 MD5Update(&ctx, sp->hisauth.secret, sp->hisauth.secret_len); 3990 MD5Update(&ctx, sp->myauth.challenge, sizeof(sp->myauth.challenge)); 3991 MD5Final(digest, &ctx); 3992 3993 #define FAILMSG "Failed..." 3994 #define SUCCMSG "Welcome!" 3995 3996 if (value_len != sizeof digest || 3997 memcmp(digest, value, value_len) != 0) { 3998 chap_failure: 3999 /* action scn, tld */ 4000 x = splnet(); 4001 sp->pp_auth_failures++; 4002 splx(x); 4003 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4004 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4005 0); 4006 chap.tld(sp); 4007 break; 4008 } 4009 sp->pp_auth_failures = 0; 4010 /* action sca, perhaps tlu */ 4011 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4012 sp->state[IDX_CHAP] == STATE_OPENED) 4013 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4014 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4015 0); 4016 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4017 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4018 chap.tlu(sp); 4019 } 4020 break; 4021 4022 default: 4023 /* Unknown CHAP packet type -- ignore. */ 4024 if (debug) { 4025 log(LOG_DEBUG, "%s: chap unknown input(%s) " 4026 "<0x%x id=0x%xh len=%d", 4027 ifp->if_xname, 4028 sppp_state_name(sp->state[IDX_CHAP]), 4029 h->type, h->ident, ntohs(h->len)); 4030 if (len > 4) 4031 sppp_print_bytes((u_char *)(h + 1), len - 4); 4032 addlog(">\n"); 4033 } 4034 break; 4035 4036 } 4037 } 4038 4039 static void 4040 sppp_chap_init(struct sppp *sp) 4041 { 4042 /* Chap doesn't have STATE_INITIAL at all. */ 4043 sp->state[IDX_CHAP] = STATE_CLOSED; 4044 sp->fail_counter[IDX_CHAP] = 0; 4045 sp->pp_seq[IDX_CHAP] = 0; 4046 sp->pp_rseq[IDX_CHAP] = 0; 4047 callout_init(&sp->ch[IDX_CHAP]); 4048 } 4049 4050 static void 4051 sppp_chap_open(struct sppp *sp) 4052 { 4053 if (sp->myauth.proto == PPP_CHAP && 4054 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4055 /* we are authenticator for CHAP, start it */ 4056 chap.scr(sp); 4057 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4058 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4059 } 4060 /* nothing to be done if we are peer, await a challenge */ 4061 } 4062 4063 static void 4064 sppp_chap_close(struct sppp *sp) 4065 { 4066 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4067 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4068 } 4069 4070 static void 4071 sppp_chap_TO(void *cookie) 4072 { 4073 struct sppp *sp = (struct sppp *)cookie; 4074 STDDCL; 4075 int s; 4076 4077 s = splnet(); 4078 if (debug) 4079 log(LOG_DEBUG, "%s: chap TO(%s) rst_counter = %d\n", 4080 ifp->if_xname, 4081 sppp_state_name(sp->state[IDX_CHAP]), 4082 sp->rst_counter[IDX_CHAP]); 4083 4084 if (--sp->rst_counter[IDX_CHAP] < 0) 4085 /* TO- event */ 4086 switch (sp->state[IDX_CHAP]) { 4087 case STATE_REQ_SENT: 4088 chap.tld(sp); 4089 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4090 break; 4091 } 4092 else 4093 /* TO+ (or TO*) event */ 4094 switch (sp->state[IDX_CHAP]) { 4095 case STATE_OPENED: 4096 /* TO* event */ 4097 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4098 /* fall through */ 4099 case STATE_REQ_SENT: 4100 chap.scr(sp); 4101 /* sppp_cp_change_state() will restart the timer */ 4102 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4103 break; 4104 } 4105 4106 splx(s); 4107 } 4108 4109 static void 4110 sppp_chap_tlu(struct sppp *sp) 4111 { 4112 STDDCL; 4113 int i, x; 4114 4115 i = 0; 4116 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4117 4118 /* 4119 * Some broken CHAP implementations (Conware CoNet, firmware 4120 * 4.0.?) don't want to re-authenticate their CHAP once the 4121 * initial challenge-response exchange has taken place. 4122 * Provide for an option to avoid rechallenges. 4123 */ 4124 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) { 4125 /* 4126 * Compute the re-challenge timeout. This will yield 4127 * a number between 300 and 810 seconds. 4128 */ 4129 i = 300 + ((unsigned)(arc4random() & 0xff00) >> 7); 4130 4131 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, sp); 4132 } 4133 4134 if (debug) { 4135 log(LOG_DEBUG, 4136 "%s: chap %s, ", 4137 ifp->if_xname, 4138 sp->pp_phase == SPPP_PHASE_NETWORK? "reconfirmed": "tlu"); 4139 if ((sp->hisauth.flags & SPPP_AUTHFLAG_NORECHALLENGE) == 0) 4140 addlog("next re-challenge in %d seconds\n", i); 4141 else 4142 addlog("re-challenging supressed\n"); 4143 } 4144 4145 x = splnet(); 4146 sp->pp_auth_failures = 0; 4147 /* indicate to LCP that we need to be closed down */ 4148 sp->lcp.protos |= (1 << IDX_CHAP); 4149 4150 if (sp->pp_flags & PP_NEEDAUTH) { 4151 /* 4152 * Remote is authenticator, but his auth proto didn't 4153 * complete yet. Defer the transition to network 4154 * phase. 4155 */ 4156 splx(x); 4157 return; 4158 } 4159 splx(x); 4160 4161 /* 4162 * If we are already in phase network, we are done here. This 4163 * is the case if this is a dummy tlu event after a re-challenge. 4164 */ 4165 if (sp->pp_phase != SPPP_PHASE_NETWORK) 4166 sppp_phase_network(sp); 4167 } 4168 4169 static void 4170 sppp_chap_tld(struct sppp *sp) 4171 { 4172 STDDCL; 4173 4174 if (debug) 4175 log(LOG_DEBUG, "%s: chap tld\n", ifp->if_xname); 4176 callout_stop(&sp->ch[IDX_CHAP]); 4177 sp->lcp.protos &= ~(1 << IDX_CHAP); 4178 4179 lcp.Close(sp); 4180 } 4181 4182 static void 4183 sppp_chap_scr(struct sppp *sp) 4184 { 4185 u_int32_t *ch; 4186 u_char clen; 4187 4188 if (sp->myauth.name == NULL) { 4189 /* can't do anything usefull */ 4190 printf("%s: chap starting without my name being set\n", 4191 sp->pp_if.if_xname); 4192 return; 4193 } 4194 4195 /* Compute random challenge. */ 4196 ch = (u_int32_t *)sp->myauth.challenge; 4197 ch[0] = arc4random(); 4198 ch[1] = arc4random(); 4199 ch[2] = arc4random(); 4200 ch[3] = arc4random(); 4201 clen = 16; /* 4 * sizeof(u_int32_t) */ 4202 4203 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4204 4205 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4206 sizeof clen, (const char *)&clen, 4207 sizeof(sp->myauth.challenge), sp->myauth.challenge, 4208 sp->myauth.name_len, 4209 sp->myauth.name, 4210 0); 4211 } 4212 4213 /* 4214 *--------------------------------------------------------------------------* 4215 * * 4216 * The PAP implementation. * 4217 * * 4218 *--------------------------------------------------------------------------* 4219 */ 4220 /* 4221 * For PAP, we need to keep a little state also if we are the peer, not the 4222 * authenticator. This is since we don't get a request to authenticate, but 4223 * have to repeatedly authenticate ourself until we got a response (or the 4224 * retry counter is expired). 4225 */ 4226 4227 /* 4228 * Handle incoming PAP packets. */ 4229 static void 4230 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4231 { 4232 STDDCL; 4233 struct lcp_header *h; 4234 int len, x; 4235 u_char mlen; 4236 char *name, *secret; 4237 int name_len, secret_len; 4238 4239 len = m->m_pkthdr.len; 4240 if (len < 5) { 4241 if (debug) 4242 log(LOG_DEBUG, 4243 "%s: pap invalid packet length: %d bytes\n", 4244 ifp->if_xname, len); 4245 return; 4246 } 4247 h = mtod(m, struct lcp_header *); 4248 if (len > ntohs(h->len)) 4249 len = ntohs(h->len); 4250 switch (h->type) { 4251 /* PAP request is my authproto */ 4252 case PAP_REQ: 4253 if (sp->hisauth.name == NULL || sp->hisauth.secret == NULL) { 4254 /* can't do anything usefull */ 4255 printf("%s: pap request without his name and his secret being set\n", 4256 ifp->if_xname); 4257 break; 4258 } 4259 name = 1 + (u_char *)(h + 1); 4260 name_len = name[-1]; 4261 secret = name + name_len + 1; 4262 if (name_len > len - 6 || 4263 (secret_len = secret[-1]) > len - 6 - name_len) { 4264 if (debug) { 4265 log(LOG_DEBUG, "%s: pap corrupted input " 4266 "<%s id=0x%x len=%d", 4267 ifp->if_xname, 4268 sppp_auth_type_name(PPP_PAP, h->type), 4269 h->ident, ntohs(h->len)); 4270 if (len > 4) 4271 sppp_print_bytes((u_char *)(h + 1), 4272 len - 4); 4273 addlog(">\n"); 4274 } 4275 break; 4276 } 4277 if (debug) { 4278 log(LOG_DEBUG, "%s: pap input(%s) " 4279 "<%s id=0x%x len=%d name=", 4280 ifp->if_xname, 4281 sppp_state_name(sp->state[IDX_PAP]), 4282 sppp_auth_type_name(PPP_PAP, h->type), 4283 h->ident, ntohs(h->len)); 4284 sppp_print_string((char *)name, name_len); 4285 addlog(" secret="); 4286 sppp_print_string((char *)secret, secret_len); 4287 addlog(">\n"); 4288 } 4289 if (name_len != sp->hisauth.name_len || 4290 secret_len != sp->hisauth.secret_len || 4291 memcmp(name, sp->hisauth.name, name_len) != 0 || 4292 memcmp(secret, sp->hisauth.secret, secret_len) != 0) { 4293 /* action scn, tld */ 4294 sp->pp_auth_failures++; 4295 mlen = sizeof(FAILMSG) - 1; 4296 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4297 sizeof mlen, (const char *)&mlen, 4298 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4299 0); 4300 pap.tld(sp); 4301 break; 4302 } 4303 /* action sca, perhaps tlu */ 4304 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4305 sp->state[IDX_PAP] == STATE_OPENED) { 4306 mlen = sizeof(SUCCMSG) - 1; 4307 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4308 sizeof mlen, (const char *)&mlen, 4309 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4310 0); 4311 } 4312 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4313 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4314 pap.tlu(sp); 4315 } 4316 break; 4317 4318 /* ack and nak are his authproto */ 4319 case PAP_ACK: 4320 callout_stop(&sp->pap_my_to_ch); 4321 if (debug) { 4322 log(LOG_DEBUG, "%s: pap success", 4323 ifp->if_xname); 4324 name_len = *(char *)h; 4325 if (len > 5 && name_len) { 4326 addlog(": "); 4327 sppp_print_string((char *)(h + 1), name_len); 4328 } 4329 addlog("\n"); 4330 } 4331 x = splnet(); 4332 sp->pp_auth_failures = 0; 4333 sp->pp_flags &= ~PP_NEEDAUTH; 4334 if (sp->myauth.proto == PPP_PAP && 4335 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4336 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4337 /* 4338 * We are authenticator for PAP but didn't 4339 * complete yet. Leave it to tlu to proceed 4340 * to network phase. 4341 */ 4342 splx(x); 4343 break; 4344 } 4345 splx(x); 4346 sppp_phase_network(sp); 4347 break; 4348 4349 case PAP_NAK: 4350 callout_stop(&sp->pap_my_to_ch); 4351 sp->pp_auth_failures++; 4352 if (debug) { 4353 log(LOG_INFO, "%s: pap failure", 4354 ifp->if_xname); 4355 name_len = *(char *)h; 4356 if (len > 5 && name_len) { 4357 addlog(": "); 4358 sppp_print_string((char *)(h + 1), name_len); 4359 } 4360 addlog("\n"); 4361 } else 4362 log(LOG_INFO, "%s: pap failure\n", 4363 ifp->if_xname); 4364 /* await LCP shutdown by authenticator */ 4365 break; 4366 4367 default: 4368 /* Unknown PAP packet type -- ignore. */ 4369 if (debug) { 4370 log(LOG_DEBUG, "%s: pap corrupted input " 4371 "<0x%x id=0x%x len=%d", 4372 ifp->if_xname, 4373 h->type, h->ident, ntohs(h->len)); 4374 if (len > 4) 4375 sppp_print_bytes((u_char *)(h + 1), len - 4); 4376 addlog(">\n"); 4377 } 4378 break; 4379 4380 } 4381 } 4382 4383 static void 4384 sppp_pap_init(struct sppp *sp) 4385 { 4386 /* PAP doesn't have STATE_INITIAL at all. */ 4387 sp->state[IDX_PAP] = STATE_CLOSED; 4388 sp->fail_counter[IDX_PAP] = 0; 4389 sp->pp_seq[IDX_PAP] = 0; 4390 sp->pp_rseq[IDX_PAP] = 0; 4391 callout_init(&sp->ch[IDX_PAP]); 4392 callout_init(&sp->pap_my_to_ch); 4393 } 4394 4395 static void 4396 sppp_pap_open(struct sppp *sp) 4397 { 4398 if (sp->hisauth.proto == PPP_PAP && 4399 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4400 /* we are authenticator for PAP, start our timer */ 4401 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4402 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4403 } 4404 if (sp->myauth.proto == PPP_PAP) { 4405 /* we are peer, send a request, and start a timer */ 4406 pap.scr(sp); 4407 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout, 4408 sppp_pap_my_TO, sp); 4409 } 4410 } 4411 4412 static void 4413 sppp_pap_close(struct sppp *sp) 4414 { 4415 if (sp->state[IDX_PAP] != STATE_CLOSED) 4416 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4417 } 4418 4419 /* 4420 * That's the timeout routine if we are authenticator. Since the 4421 * authenticator is basically passive in PAP, we can't do much here. 4422 */ 4423 static void 4424 sppp_pap_TO(void *cookie) 4425 { 4426 struct sppp *sp = (struct sppp *)cookie; 4427 STDDCL; 4428 int s; 4429 4430 s = splnet(); 4431 if (debug) 4432 log(LOG_DEBUG, "%s: pap TO(%s) rst_counter = %d\n", 4433 ifp->if_xname, 4434 sppp_state_name(sp->state[IDX_PAP]), 4435 sp->rst_counter[IDX_PAP]); 4436 4437 if (--sp->rst_counter[IDX_PAP] < 0) 4438 /* TO- event */ 4439 switch (sp->state[IDX_PAP]) { 4440 case STATE_REQ_SENT: 4441 pap.tld(sp); 4442 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4443 break; 4444 } 4445 else 4446 /* TO+ event, not very much we could do */ 4447 switch (sp->state[IDX_PAP]) { 4448 case STATE_REQ_SENT: 4449 /* sppp_cp_change_state() will restart the timer */ 4450 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4451 break; 4452 } 4453 4454 splx(s); 4455 } 4456 4457 /* 4458 * That's the timeout handler if we are peer. Since the peer is active, 4459 * we need to retransmit our PAP request since it is apparently lost. 4460 * XXX We should impose a max counter. 4461 */ 4462 static void 4463 sppp_pap_my_TO(void *cookie) 4464 { 4465 struct sppp *sp = (struct sppp *)cookie; 4466 STDDCL; 4467 4468 if (debug) 4469 log(LOG_DEBUG, "%s: pap peer TO\n", 4470 ifp->if_xname); 4471 4472 pap.scr(sp); 4473 } 4474 4475 static void 4476 sppp_pap_tlu(struct sppp *sp) 4477 { 4478 STDDCL; 4479 int x; 4480 4481 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4482 4483 if (debug) 4484 log(LOG_DEBUG, "%s: %s tlu\n", 4485 ifp->if_xname, pap.name); 4486 4487 x = splnet(); 4488 sp->pp_auth_failures = 0; 4489 /* indicate to LCP that we need to be closed down */ 4490 sp->lcp.protos |= (1 << IDX_PAP); 4491 4492 if (sp->pp_flags & PP_NEEDAUTH) { 4493 /* 4494 * Remote is authenticator, but his auth proto didn't 4495 * complete yet. Defer the transition to network 4496 * phase. 4497 */ 4498 splx(x); 4499 return; 4500 } 4501 splx(x); 4502 sppp_phase_network(sp); 4503 } 4504 4505 static void 4506 sppp_pap_tld(struct sppp *sp) 4507 { 4508 STDDCL; 4509 4510 if (debug) 4511 log(LOG_DEBUG, "%s: pap tld\n", ifp->if_xname); 4512 callout_stop(&sp->ch[IDX_PAP]); 4513 callout_stop(&sp->pap_my_to_ch); 4514 sp->lcp.protos &= ~(1 << IDX_PAP); 4515 4516 lcp.Close(sp); 4517 } 4518 4519 static void 4520 sppp_pap_scr(struct sppp *sp) 4521 { 4522 u_char idlen, pwdlen; 4523 4524 if (sp->myauth.secret == NULL || sp->myauth.name == NULL) { 4525 /* can't do anything usefull */ 4526 printf("%s: pap starting without my name and secret being set\n", 4527 sp->pp_if.if_xname); 4528 return; 4529 } 4530 4531 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4532 pwdlen = sp->myauth.secret_len; 4533 idlen = sp->myauth.name_len; 4534 4535 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4536 sizeof idlen, (const char *)&idlen, 4537 idlen, sp->myauth.name, 4538 sizeof pwdlen, (const char *)&pwdlen, 4539 pwdlen, sp->myauth.secret, 4540 0); 4541 } 4542 4543 /* 4544 * Random miscellaneous functions. 4545 */ 4546 4547 /* 4548 * Send a PAP or CHAP proto packet. 4549 * 4550 * Varadic function, each of the elements for the ellipsis is of type 4551 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4552 * mlen == 0. 4553 * NOTE: never declare variadic functions with types subject to type 4554 * promotion (i.e. u_char). This is asking for big trouble depending 4555 * on the architecture you are on... 4556 */ 4557 4558 static void 4559 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4560 unsigned int type, unsigned int id, 4561 ...) 4562 { 4563 STDDCL; 4564 struct lcp_header *lh; 4565 struct mbuf *m; 4566 u_char *p; 4567 int len; 4568 size_t pkthdrlen; 4569 unsigned int mlen; 4570 const char *msg; 4571 va_list ap; 4572 4573 MGETHDR(m, M_DONTWAIT, MT_DATA); 4574 if (! m) 4575 return; 4576 m->m_pkthdr.rcvif = 0; 4577 4578 if (sp->pp_flags & PP_NOFRAMING) { 4579 *mtod(m, u_int16_t *) = htons(cp->proto); 4580 pkthdrlen = 2; 4581 lh = (struct lcp_header *)(mtod(m, u_int8_t *)+2); 4582 } else { 4583 struct ppp_header *h; 4584 h = mtod(m, struct ppp_header *); 4585 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4586 h->control = PPP_UI; /* Unnumbered Info */ 4587 h->protocol = htons(cp->proto); 4588 pkthdrlen = PPP_HEADER_LEN; 4589 4590 lh = (struct lcp_header *)(h + 1); 4591 } 4592 4593 lh->type = type; 4594 lh->ident = id; 4595 p = (u_char *)(lh + 1); 4596 4597 va_start(ap, id); 4598 len = 0; 4599 4600 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4601 msg = va_arg(ap, const char *); 4602 len += mlen; 4603 if (len > MHLEN - pkthdrlen - LCP_HEADER_LEN) { 4604 va_end(ap); 4605 m_freem(m); 4606 return; 4607 } 4608 4609 bcopy(msg, p, mlen); 4610 p += mlen; 4611 } 4612 va_end(ap); 4613 4614 m->m_pkthdr.len = m->m_len = pkthdrlen + LCP_HEADER_LEN + len; 4615 lh->len = htons(LCP_HEADER_LEN + len); 4616 4617 if (debug) { 4618 log(LOG_DEBUG, "%s: %s output <%s id=0x%x len=%d", 4619 ifp->if_xname, cp->name, 4620 sppp_auth_type_name(cp->proto, lh->type), 4621 lh->ident, ntohs(lh->len)); 4622 if (len) 4623 sppp_print_bytes((u_char *)(lh + 1), len); 4624 addlog(">\n"); 4625 } 4626 if (IF_QFULL(&sp->pp_cpq)) { 4627 IF_DROP(&sp->pp_fastq); 4628 IF_DROP(&ifp->if_snd); 4629 m_freem(m); 4630 ++ifp->if_oerrors; 4631 return; 4632 } else 4633 IF_ENQUEUE(&sp->pp_cpq, m); 4634 if (! (ifp->if_flags & IFF_OACTIVE)) 4635 (*ifp->if_start)(ifp); 4636 ifp->if_obytes += m->m_pkthdr.len + 3; 4637 } 4638 4639 /* 4640 * Send keepalive packets, every 10 seconds. 4641 */ 4642 static void 4643 sppp_keepalive(void *dummy) 4644 { 4645 struct sppp *sp; 4646 int s; 4647 time_t now; 4648 4649 s = splnet(); 4650 now = mono_time.tv_sec; 4651 for (sp=spppq; sp; sp=sp->pp_next) { 4652 struct ifnet *ifp = &sp->pp_if; 4653 4654 /* check idle timeout */ 4655 if ((sp->pp_idle_timeout != 0) && (ifp->if_flags & IFF_RUNNING) 4656 && (sp->pp_phase == SPPP_PHASE_NETWORK)) { 4657 /* idle timeout is enabled for this interface */ 4658 if ((now-sp->pp_last_activity) >= sp->pp_idle_timeout) { 4659 if (ifp->if_flags & IFF_DEBUG) 4660 printf("%s: no activitiy for %lu seconds\n", 4661 sp->pp_if.if_xname, 4662 (unsigned long)(now-sp->pp_last_activity)); 4663 lcp.Close(sp); 4664 continue; 4665 } 4666 } 4667 4668 /* Keepalive mode disabled or channel down? */ 4669 if (! (sp->pp_flags & PP_KEEPALIVE) || 4670 ! (ifp->if_flags & IFF_RUNNING)) 4671 continue; 4672 4673 /* No keepalive in PPP mode if LCP not opened yet. */ 4674 if (! (sp->pp_flags & PP_CISCO) && 4675 sp->pp_phase < SPPP_PHASE_AUTHENTICATE) 4676 continue; 4677 4678 /* No echo reply, but maybe user data passed through? */ 4679 if ((now - sp->pp_last_activity) < LCP_KEEPALIVE_INTERVAL) { 4680 sp->pp_alivecnt = 0; 4681 continue; 4682 } 4683 4684 if (sp->pp_alivecnt == MAXALIVECNT) { 4685 /* No keepalive packets got. Stop the interface. */ 4686 if_down (ifp); 4687 IF_PURGE(&sp->pp_cpq); 4688 if (! (sp->pp_flags & PP_CISCO)) { 4689 printf("%s: LCP keepalive timed out, going to restart the connection\n", 4690 ifp->if_xname); 4691 sp->pp_alivecnt = 0; 4692 4693 /* we are down, close all open protocols */ 4694 lcp.Close(sp); 4695 4696 /* And now prepare LCP to reestablish the link, if configured to do so. */ 4697 sppp_cp_change_state(&lcp, sp, STATE_STOPPED); 4698 4699 /* Close connection imediatly, completition of this 4700 * will summon the magic needed to reestablish it. */ 4701 sp->pp_tlf(sp); 4702 continue; 4703 } 4704 } 4705 if (sp->pp_alivecnt <= MAXALIVECNT) 4706 ++sp->pp_alivecnt; 4707 if (sp->pp_flags & PP_CISCO) 4708 sppp_cisco_send(sp, CISCO_KEEPALIVE_REQ, 4709 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4710 else if (sp->pp_phase >= SPPP_PHASE_AUTHENTICATE) { 4711 int32_t nmagic = htonl(sp->lcp.magic); 4712 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4713 sppp_cp_send(sp, PPP_LCP, ECHO_REQ, 4714 sp->lcp.echoid, 4, &nmagic); 4715 } 4716 } 4717 splx(s); 4718 callout_reset(&keepalive_ch, hz * LCP_KEEPALIVE_INTERVAL, sppp_keepalive, NULL); 4719 } 4720 4721 /* 4722 * Get both IP addresses. 4723 */ 4724 static void 4725 sppp_get_ip_addrs(struct sppp *sp, u_int32_t *src, u_int32_t *dst, u_int32_t *srcmask) 4726 { 4727 struct ifnet *ifp = &sp->pp_if; 4728 struct ifaddr *ifa; 4729 struct sockaddr_in *si, *sm; 4730 u_int32_t ssrc, ddst; 4731 4732 sm = NULL; 4733 ssrc = ddst = 0; 4734 /* 4735 * Pick the first AF_INET address from the list, 4736 * aliases don't make any sense on a p2p link anyway. 4737 */ 4738 si = 0; 4739 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 4740 if (ifa->ifa_addr->sa_family == AF_INET) { 4741 si = (struct sockaddr_in *)ifa->ifa_addr; 4742 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4743 if (si) 4744 break; 4745 } 4746 } 4747 if (ifa) { 4748 if (si && si->sin_addr.s_addr) { 4749 ssrc = si->sin_addr.s_addr; 4750 if (srcmask) 4751 *srcmask = ntohl(sm->sin_addr.s_addr); 4752 } 4753 4754 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4755 if (si && si->sin_addr.s_addr) 4756 ddst = si->sin_addr.s_addr; 4757 } 4758 4759 if (dst) *dst = ntohl(ddst); 4760 if (src) *src = ntohl(ssrc); 4761 } 4762 4763 /* 4764 * Set IP addresses. Must be called at splnet. 4765 * If an address is 0, leave it the way it is. 4766 */ 4767 static void 4768 sppp_set_ip_addrs(struct sppp *sp, u_int32_t myaddr, u_int32_t hisaddr) 4769 { 4770 STDDCL; 4771 struct ifaddr *ifa; 4772 struct sockaddr_in *si; 4773 struct sockaddr_in *dest; 4774 4775 /* 4776 * Pick the first AF_INET address from the list, 4777 * aliases don't make any sense on a p2p link anyway. 4778 */ 4779 4780 si = 0; 4781 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4782 { 4783 if (ifa->ifa_addr->sa_family == AF_INET) 4784 { 4785 si = (struct sockaddr_in *)ifa->ifa_addr; 4786 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4787 if (si) 4788 break; 4789 } 4790 } 4791 4792 if (ifa && si) 4793 { 4794 int error; 4795 struct sockaddr_in new_sin = *si; 4796 struct sockaddr_in new_dst = *dest; 4797 4798 /* 4799 * Scrub old routes now instead of calling in_ifinit with 4800 * scrub=1, because we may change the dstaddr 4801 * before the call to in_ifinit. 4802 */ 4803 in_ifscrub(ifp, ifatoia(ifa)); 4804 4805 if (myaddr != 0) 4806 new_sin.sin_addr.s_addr = htonl(myaddr); 4807 if (hisaddr != 0) { 4808 new_dst.sin_addr.s_addr = htonl(hisaddr); 4809 if (new_dst.sin_addr.s_addr != dest->sin_addr.s_addr) { 4810 sp->ipcp.saved_hisaddr = dest->sin_addr.s_addr; 4811 *dest = new_dst; /* fix dstaddr in place */ 4812 } 4813 } 4814 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4815 if(debug && error) 4816 { 4817 log(LOG_DEBUG, "%s: sppp_set_ip_addrs: in_ifinit " 4818 " failed, error=%d\n", ifp->if_xname, error); 4819 } 4820 } 4821 } 4822 4823 /* 4824 * Clear IP addresses. Must be called at splnet. 4825 */ 4826 static void 4827 sppp_clear_ip_addrs(struct sppp *sp) 4828 { 4829 struct ifnet *ifp = &sp->pp_if; 4830 struct ifaddr *ifa; 4831 struct sockaddr_in *si; 4832 struct sockaddr_in *dest; 4833 4834 u_int32_t remote; 4835 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4836 remote = sp->ipcp.saved_hisaddr; 4837 else 4838 sppp_get_ip_addrs(sp, 0, &remote, 0); 4839 4840 /* 4841 * Pick the first AF_INET address from the list, 4842 * aliases don't make any sense on a p2p link anyway. 4843 */ 4844 4845 si = 0; 4846 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4847 { 4848 if (ifa->ifa_addr->sa_family == AF_INET) 4849 { 4850 si = (struct sockaddr_in *)ifa->ifa_addr; 4851 dest = (struct sockaddr_in *)ifa->ifa_dstaddr; 4852 if (si) 4853 break; 4854 } 4855 } 4856 4857 if (ifa && si) 4858 { 4859 struct sockaddr_in new_sin = *si; 4860 4861 in_ifscrub(ifp, ifatoia(ifa)); 4862 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 4863 new_sin.sin_addr.s_addr = 0; 4864 if (sp->ipcp.flags & IPCP_HISADDR_DYN) 4865 /* replace peer addr in place */ 4866 dest->sin_addr.s_addr = sp->ipcp.saved_hisaddr; 4867 in_ifinit(ifp, ifatoia(ifa), &new_sin, 0); 4868 } 4869 } 4870 4871 #ifdef INET6 4872 /* 4873 * Get both IPv6 addresses. 4874 */ 4875 static void 4876 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4877 struct in6_addr *srcmask) 4878 { 4879 struct ifnet *ifp = &sp->pp_if; 4880 struct ifaddr *ifa; 4881 struct sockaddr_in6 *si, *sm; 4882 struct in6_addr ssrc, ddst; 4883 4884 sm = NULL; 4885 memset(&ssrc, 0, sizeof(ssrc)); 4886 memset(&ddst, 0, sizeof(ddst)); 4887 /* 4888 * Pick the first link-local AF_INET6 address from the list, 4889 * aliases don't make any sense on a p2p link anyway. 4890 */ 4891 si = 0; 4892 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4893 if (ifa->ifa_addr->sa_family == AF_INET6) { 4894 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4895 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4896 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4897 break; 4898 } 4899 if (ifa) { 4900 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4901 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 4902 if (srcmask) { 4903 bcopy(&sm->sin6_addr, srcmask, 4904 sizeof(*srcmask)); 4905 } 4906 } 4907 4908 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4909 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4910 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 4911 } 4912 4913 if (dst) 4914 bcopy(&ddst, dst, sizeof(*dst)); 4915 if (src) 4916 bcopy(&ssrc, src, sizeof(*src)); 4917 } 4918 4919 #ifdef IPV6CP_MYIFID_DYN 4920 /* 4921 * Generate random ifid. 4922 */ 4923 static void 4924 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 4925 { 4926 /* TBD */ 4927 } 4928 4929 /* 4930 * Set my IPv6 address. Must be called at splnet. 4931 */ 4932 static void 4933 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 4934 { 4935 STDDCL; 4936 struct ifaddr *ifa; 4937 struct sockaddr_in6 *sin6; 4938 4939 /* 4940 * Pick the first link-local AF_INET6 address from the list, 4941 * aliases don't make any sense on a p2p link anyway. 4942 */ 4943 4944 sin6 = NULL; 4945 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 4946 { 4947 if (ifa->ifa_addr->sa_family == AF_INET6) 4948 { 4949 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 4950 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 4951 break; 4952 } 4953 } 4954 4955 if (ifa && sin6) 4956 { 4957 int error; 4958 struct sockaddr_in6 new_sin6 = *sin6; 4959 4960 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 4961 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 4962 if (debug && error) 4963 { 4964 log(LOG_DEBUG, "%s: sppp_set_ip6_addr: in6_ifinit " 4965 " failed, error=%d\n", ifp->if_xname, error); 4966 } 4967 } 4968 } 4969 #endif 4970 4971 /* 4972 * Suggest a candidate address to be used by peer. 4973 */ 4974 static void 4975 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 4976 { 4977 struct in6_addr myaddr; 4978 struct timeval tv; 4979 4980 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 4981 4982 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 4983 microtime(&tv); 4984 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 4985 myaddr.s6_addr[14] ^= 0xff; 4986 myaddr.s6_addr[15] ^= 0xff; 4987 } else { 4988 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 4989 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 4990 } 4991 if (suggest) 4992 bcopy(&myaddr, suggest, sizeof(myaddr)); 4993 } 4994 #endif /*INET6*/ 4995 4996 /* 4997 * Process ioctl requests specific to the PPP interface. 4998 * Permissions have already been checked. 4999 */ 5000 static int 5001 sppp_params(struct sppp *sp, int cmd, void *data) 5002 { 5003 switch (cmd) { 5004 case SPPPGETAUTHCFG: 5005 { 5006 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5007 int error; 5008 size_t len; 5009 5010 cfg->myauthflags = sp->myauth.flags; 5011 cfg->hisauthflags = sp->hisauth.flags; 5012 strncpy(cfg->ifname, sp->pp_if.if_xname, IFNAMSIZ); 5013 cfg->hisauth = 0; 5014 if (sp->hisauth.proto) 5015 cfg->hisauth = (sp->hisauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5016 cfg->myauth = 0; 5017 if (sp->myauth.proto) 5018 cfg->myauth = (sp->myauth.proto == PPP_PAP) ? SPPP_AUTHPROTO_PAP : SPPP_AUTHPROTO_CHAP; 5019 if (cfg->myname_length == 0) { 5020 if (sp->myauth.name != NULL) 5021 cfg->myname_length = sp->myauth.name_len + 1; 5022 } else { 5023 if (sp->myauth.name == NULL) { 5024 cfg->myname_length = 0; 5025 } else { 5026 len = sp->myauth.name_len + 1; 5027 if (cfg->myname_length < len) 5028 return (ENAMETOOLONG); 5029 error = copyout(sp->myauth.name, cfg->myname, len); 5030 if (error) return error; 5031 } 5032 } 5033 if (cfg->hisname_length == 0) { 5034 if(sp->hisauth.name != NULL) 5035 cfg->hisname_length = sp->hisauth.name_len + 1; 5036 } else { 5037 if (sp->hisauth.name == NULL) { 5038 cfg->hisname_length = 0; 5039 } else { 5040 len = sp->hisauth.name_len + 1; 5041 if (cfg->hisname_length < len) 5042 return (ENAMETOOLONG); 5043 error = copyout(sp->hisauth.name, cfg->hisname, len); 5044 if (error) return error; 5045 } 5046 } 5047 } 5048 break; 5049 case SPPPSETAUTHCFG: 5050 { 5051 struct spppauthcfg *cfg = (struct spppauthcfg *)data; 5052 int error; 5053 5054 if (sp->myauth.name) { 5055 free(sp->myauth.name, M_DEVBUF); 5056 sp->myauth.name = NULL; 5057 } 5058 if (sp->myauth.secret) { 5059 free(sp->myauth.secret, M_DEVBUF); 5060 sp->myauth.secret = NULL; 5061 } 5062 if (sp->hisauth.name) { 5063 free(sp->hisauth.name, M_DEVBUF); 5064 sp->hisauth.name = NULL; 5065 } 5066 if (sp->hisauth.secret) { 5067 free(sp->hisauth.secret, M_DEVBUF); 5068 sp->hisauth.secret = NULL; 5069 } 5070 5071 if (cfg->hisname != NULL && cfg->hisname_length > 0) { 5072 if (cfg->hisname_length >= MCLBYTES) 5073 return (ENAMETOOLONG); 5074 sp->hisauth.name = malloc(cfg->hisname_length, M_DEVBUF, M_WAITOK); 5075 error = copyin(cfg->hisname, sp->hisauth.name, cfg->hisname_length); 5076 if (error) { 5077 free(sp->hisauth.name, M_DEVBUF); 5078 sp->hisauth.name = NULL; 5079 return error; 5080 } 5081 sp->hisauth.name_len = cfg->hisname_length - 1; 5082 sp->hisauth.name[sp->hisauth.name_len] = 0; 5083 } 5084 if (cfg->hissecret != NULL && cfg->hissecret_length > 0) { 5085 if (cfg->hissecret_length >= MCLBYTES) 5086 return (ENAMETOOLONG); 5087 sp->hisauth.secret = malloc(cfg->hissecret_length, M_DEVBUF, M_WAITOK); 5088 error = copyin(cfg->hissecret, sp->hisauth.secret, cfg->hissecret_length); 5089 if (error) { 5090 free(sp->hisauth.secret, M_DEVBUF); 5091 sp->hisauth.secret = NULL; 5092 return error; 5093 } 5094 sp->hisauth.secret_len = cfg->hissecret_length - 1; 5095 sp->hisauth.secret[sp->hisauth.secret_len] = 0; 5096 } 5097 if (cfg->myname != NULL && cfg->myname_length > 0) { 5098 if (cfg->myname_length >= MCLBYTES) 5099 return (ENAMETOOLONG); 5100 sp->myauth.name = malloc(cfg->myname_length, M_DEVBUF, M_WAITOK); 5101 error = copyin(cfg->myname, sp->myauth.name, cfg->myname_length); 5102 if (error) { 5103 free(sp->myauth.name, M_DEVBUF); 5104 sp->myauth.name = NULL; 5105 return error; 5106 } 5107 sp->myauth.name_len = cfg->myname_length - 1; 5108 sp->myauth.name[sp->myauth.name_len] = 0; 5109 } 5110 if (cfg->mysecret != NULL && cfg->mysecret_length > 0) { 5111 if (cfg->mysecret_length >= MCLBYTES) 5112 return (ENAMETOOLONG); 5113 sp->myauth.secret = malloc(cfg->mysecret_length, M_DEVBUF, M_WAITOK); 5114 error = copyin(cfg->mysecret, sp->myauth.secret, cfg->mysecret_length); 5115 if (error) { 5116 free(sp->myauth.secret, M_DEVBUF); 5117 sp->myauth.secret = NULL; 5118 return error; 5119 } 5120 sp->myauth.secret_len = cfg->mysecret_length - 1; 5121 sp->myauth.secret[sp->myauth.secret_len] = 0; 5122 } 5123 sp->myauth.flags = cfg->myauthflags; 5124 if (cfg->myauth) 5125 sp->myauth.proto = (cfg->myauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5126 sp->hisauth.flags = cfg->hisauthflags; 5127 if (cfg->hisauth) 5128 sp->hisauth.proto = (cfg->hisauth == SPPP_AUTHPROTO_PAP) ? PPP_PAP : PPP_CHAP; 5129 sp->pp_auth_failures = 0; 5130 if (sp->hisauth.proto != 0) 5131 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 5132 else 5133 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 5134 } 5135 break; 5136 case SPPPGETLCPCFG: 5137 { 5138 struct sppplcpcfg *lcp = (struct sppplcpcfg *)data; 5139 lcp->lcp_timeout = sp->lcp.timeout; 5140 } 5141 break; 5142 case SPPPSETLCPCFG: 5143 { 5144 struct sppplcpcfg *lcp = (struct sppplcpcfg *)data; 5145 sp->lcp.timeout = lcp->lcp_timeout; 5146 } 5147 break; 5148 case SPPPGETSTATUS: 5149 { 5150 struct spppstatus *status = (struct spppstatus *)data; 5151 status->phase = sp->pp_phase; 5152 } 5153 break; 5154 case SPPPGETIDLETO: 5155 { 5156 struct spppidletimeout *to = (struct spppidletimeout *)data; 5157 to->idle_seconds = sp->pp_idle_timeout; 5158 } 5159 break; 5160 case SPPPSETIDLETO: 5161 { 5162 struct spppidletimeout *to = (struct spppidletimeout *)data; 5163 sp->pp_idle_timeout = to->idle_seconds; 5164 } 5165 break; 5166 case SPPPSETAUTHFAILURE: 5167 { 5168 struct spppauthfailuresettings *afsettings = (struct spppauthfailuresettings *)data; 5169 sp->pp_max_auth_fail = afsettings->max_failures; 5170 sp->pp_auth_failures = 0; 5171 } 5172 break; 5173 case SPPPGETAUTHFAILURES: 5174 { 5175 struct spppauthfailurestats *stats = (struct spppauthfailurestats *)data; 5176 stats->auth_failures = sp->pp_auth_failures; 5177 stats->max_failures = sp->pp_max_auth_fail; 5178 } 5179 break; 5180 case SPPPSETDNSOPTS: 5181 { 5182 struct spppdnssettings *req = (struct spppdnssettings *)data; 5183 sp->query_dns = req->query_dns & 3; 5184 } 5185 break; 5186 case SPPPGETDNSOPTS: 5187 { 5188 struct spppdnssettings *req = (struct spppdnssettings *)data; 5189 req->query_dns = sp->query_dns; 5190 } 5191 break; 5192 case SPPPGETDNSADDRS: 5193 { 5194 struct spppdnsaddrs *addrs = (struct spppdnsaddrs *)data; 5195 memcpy(&addrs->dns, &sp->dns_addrs, sizeof addrs->dns); 5196 } 5197 break; 5198 default: 5199 return (EINVAL); 5200 } 5201 5202 return (0); 5203 } 5204 5205 static void 5206 sppp_phase_network(struct sppp *sp) 5207 { 5208 STDDCL; 5209 int i; 5210 u_int32_t mask; 5211 5212 sp->pp_phase = SPPP_PHASE_NETWORK; 5213 5214 if(debug) 5215 { 5216 log(LOG_INFO, "%s: phase %s\n", ifp->if_xname, 5217 sppp_phase_name(sp->pp_phase)); 5218 } 5219 5220 /* Notify NCPs now. */ 5221 for (i = 0; i < IDX_COUNT; i++) 5222 if ((cps[i])->flags & CP_NCP) 5223 (cps[i])->Open(sp); 5224 5225 /* Send Up events to all NCPs. */ 5226 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5227 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5228 (cps[i])->Up(sp); 5229 5230 /* if no NCP is starting, all this was in vain, close down */ 5231 sppp_lcp_check_and_close(sp); 5232 } 5233 5234 5235 static const char * 5236 sppp_cp_type_name(u_char type) 5237 { 5238 static char buf[12]; 5239 switch (type) { 5240 case CONF_REQ: return "conf-req"; 5241 case CONF_ACK: return "conf-ack"; 5242 case CONF_NAK: return "conf-nak"; 5243 case CONF_REJ: return "conf-rej"; 5244 case TERM_REQ: return "term-req"; 5245 case TERM_ACK: return "term-ack"; 5246 case CODE_REJ: return "code-rej"; 5247 case PROTO_REJ: return "proto-rej"; 5248 case ECHO_REQ: return "echo-req"; 5249 case ECHO_REPLY: return "echo-reply"; 5250 case DISC_REQ: return "discard-req"; 5251 } 5252 sprintf (buf, "0x%x", type); 5253 return buf; 5254 } 5255 5256 static const char * 5257 sppp_auth_type_name(u_short proto, u_char type) 5258 { 5259 static char buf[12]; 5260 switch (proto) { 5261 case PPP_CHAP: 5262 switch (type) { 5263 case CHAP_CHALLENGE: return "challenge"; 5264 case CHAP_RESPONSE: return "response"; 5265 case CHAP_SUCCESS: return "success"; 5266 case CHAP_FAILURE: return "failure"; 5267 } 5268 case PPP_PAP: 5269 switch (type) { 5270 case PAP_REQ: return "req"; 5271 case PAP_ACK: return "ack"; 5272 case PAP_NAK: return "nak"; 5273 } 5274 } 5275 sprintf (buf, "0x%x", type); 5276 return buf; 5277 } 5278 5279 static const char * 5280 sppp_lcp_opt_name(u_char opt) 5281 { 5282 static char buf[12]; 5283 switch (opt) { 5284 case LCP_OPT_MRU: return "mru"; 5285 case LCP_OPT_ASYNC_MAP: return "async-map"; 5286 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5287 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5288 case LCP_OPT_MAGIC: return "magic"; 5289 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5290 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5291 } 5292 sprintf (buf, "0x%x", opt); 5293 return buf; 5294 } 5295 5296 static const char * 5297 sppp_ipcp_opt_name(u_char opt) 5298 { 5299 static char buf[12]; 5300 switch (opt) { 5301 case IPCP_OPT_ADDRESSES: return "addresses"; 5302 case IPCP_OPT_COMPRESSION: return "compression"; 5303 case IPCP_OPT_ADDRESS: return "address"; 5304 } 5305 sprintf (buf, "0x%x", opt); 5306 return buf; 5307 } 5308 5309 #ifdef INET6 5310 static const char * 5311 sppp_ipv6cp_opt_name(u_char opt) 5312 { 5313 static char buf[12]; 5314 switch (opt) { 5315 case IPV6CP_OPT_IFID: return "ifid"; 5316 case IPV6CP_OPT_COMPRESSION: return "compression"; 5317 } 5318 sprintf (buf, "0x%x", opt); 5319 return buf; 5320 } 5321 #endif 5322 5323 static const char * 5324 sppp_state_name(int state) 5325 { 5326 switch (state) { 5327 case STATE_INITIAL: return "initial"; 5328 case STATE_STARTING: return "starting"; 5329 case STATE_CLOSED: return "closed"; 5330 case STATE_STOPPED: return "stopped"; 5331 case STATE_CLOSING: return "closing"; 5332 case STATE_STOPPING: return "stopping"; 5333 case STATE_REQ_SENT: return "req-sent"; 5334 case STATE_ACK_RCVD: return "ack-rcvd"; 5335 case STATE_ACK_SENT: return "ack-sent"; 5336 case STATE_OPENED: return "opened"; 5337 } 5338 return "illegal"; 5339 } 5340 5341 static const char * 5342 sppp_phase_name(int phase) 5343 { 5344 switch (phase) { 5345 case SPPP_PHASE_DEAD: return "dead"; 5346 case SPPP_PHASE_ESTABLISH: return "establish"; 5347 case SPPP_PHASE_TERMINATE: return "terminate"; 5348 case SPPP_PHASE_AUTHENTICATE: return "authenticate"; 5349 case SPPP_PHASE_NETWORK: return "network"; 5350 } 5351 return "illegal"; 5352 } 5353 5354 static const char * 5355 sppp_proto_name(u_short proto) 5356 { 5357 static char buf[12]; 5358 switch (proto) { 5359 case PPP_LCP: return "lcp"; 5360 case PPP_IPCP: return "ipcp"; 5361 case PPP_PAP: return "pap"; 5362 case PPP_CHAP: return "chap"; 5363 case PPP_IPV6CP: return "ipv6cp"; 5364 } 5365 sprintf(buf, "0x%x", (unsigned)proto); 5366 return buf; 5367 } 5368 5369 static void 5370 sppp_print_bytes(const u_char *p, u_short len) 5371 { 5372 addlog(" %02x", *p++); 5373 while (--len > 0) 5374 addlog("-%02x", *p++); 5375 } 5376 5377 static void 5378 sppp_print_string(const char *p, u_short len) 5379 { 5380 u_char c; 5381 5382 while (len-- > 0) { 5383 c = *p++; 5384 /* 5385 * Print only ASCII chars directly. RFC 1994 recommends 5386 * using only them, but we don't rely on it. */ 5387 if (c < ' ' || c > '~') 5388 addlog("\\x%x", c); 5389 else 5390 addlog("%c", c); 5391 } 5392 } 5393 5394 static const char * 5395 sppp_dotted_quad(u_int32_t addr) 5396 { 5397 static char s[16]; 5398 sprintf(s, "%d.%d.%d.%d", 5399 (int)((addr >> 24) & 0xff), 5400 (int)((addr >> 16) & 0xff), 5401 (int)((addr >> 8) & 0xff), 5402 (int)(addr & 0xff)); 5403 return s; 5404 } 5405 5406 /* a dummy, used to drop uninteresting events */ 5407 static void 5408 sppp_null(struct sppp *unused) 5409 { 5410 /* do just nothing */ 5411 } 5412 /* 5413 * This file is large. Tell emacs to highlight it nevertheless. 5414 * 5415 * Local Variables: 5416 * hilit-auto-highlight-maxout: 120000 5417 * End: 5418 */ 5419
Indexes created Sat Sep 27 22:09:54 GMT 2025