1 /* 2 * Synchronous PPP/Cisco link level subroutines. 3 * Keepalive protocol implemented in both Cisco and PPP modes. 4 * 5 * Copyright (C) 1994-1996 Cronyx Engineering Ltd. 6 * Author: Serge Vakulenko, <vak@cronyx.ru> 7 * 8 * Heavily revamped to conform to RFC 1661. 9 * Copyright (C) 1997, 2001 Joerg Wunsch. 10 * 11 * This software is distributed with NO WARRANTIES, not even the implied 12 * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 13 * 14 * Authors grant any other persons or organisations permission to use 15 * or modify this software as long as this message is kept with the software, 16 * all derivative works or modified versions. 17 * 18 * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997 19 * 20 * $FreeBSD: src/sys/net/if_spppsubr.c,v 1.59.2.13 2002/07/03 15:44:41 joerg Exp $ 21 * $DragonFly: src/sys/net/sppp/if_spppsubr.c,v 1.35 2008/06/09 11:24:24 sephe Exp $ 22 */ 23 24 #include <sys/param.h> 25 26 #if defined(__DragonFly__) 27 #include "opt_inet.h" 28 #include "opt_inet6.h" 29 #include "opt_ipx.h" 30 #endif 31 32 #ifdef NetBSD1_3 33 # if NetBSD1_3 > 6 34 # include "opt_inet.h" 35 # include "opt_inet6.h" 36 # include "opt_iso.h" 37 # endif 38 #endif 39 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/module.h> 43 #include <sys/sockio.h> 44 #include <sys/socket.h> 45 #include <sys/syslog.h> 46 #if defined(__DragonFly__) 47 #include <sys/random.h> 48 #include <sys/thread2.h> 49 #endif 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 53 #if defined (__OpenBSD__) 54 #include <sys/md5k.h> 55 #else 56 #include <sys/md5.h> 57 #endif 58 59 #include <net/if.h> 60 #include <net/ifq_var.h> 61 #include <net/netisr.h> 62 #include <net/if_types.h> 63 #include <net/route.h> 64 #include <netinet/in.h> 65 #include <netinet/in_systm.h> 66 #include <netinet/ip.h> 67 #include <net/slcompress.h> 68 69 #if defined (__NetBSD__) || defined (__OpenBSD__) 70 #include <machine/cpu.h> /* XXX for softnet */ 71 #endif 72 73 #include <machine/stdarg.h> 74 75 #include <netinet/in.h> 76 #include <netinet/in_systm.h> 77 #include <netinet/in_var.h> 78 79 #ifdef INET 80 #include <netinet/ip.h> 81 #include <netinet/tcp.h> 82 #endif 83 84 #if defined (__DragonFly__) || defined (__OpenBSD__) 85 # include <netinet/if_ether.h> 86 #else 87 # include <net/ethertypes.h> 88 #endif 89 90 #ifdef IPX 91 #include <netproto/ipx/ipx.h> 92 #include <netproto/ipx/ipx_if.h> 93 #endif 94 95 #ifdef NS 96 #include <netns/ns.h> 97 #include <netns/ns_if.h> 98 #endif 99 100 #include "if_sppp.h" 101 102 #define IOCTL_CMD_T u_long 103 #define MAXALIVECNT 3 /* max. alive packets */ 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 #define IFF_CISCO IFF_LINK2 /* auto-dial on output */ 129 130 #define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */ 131 #define PPP_UI 0x03 /* Unnumbered Information */ 132 #define PPP_IP 0x0021 /* Internet Protocol */ 133 #define PPP_ISO 0x0023 /* ISO OSI Protocol */ 134 #define PPP_XNS 0x0025 /* Xerox NS Protocol */ 135 #define PPP_IPX 0x002b /* Novell IPX Protocol */ 136 #define PPP_VJ_COMP 0x002d /* VJ compressed TCP/IP */ 137 #define PPP_VJ_UCOMP 0x002f /* VJ uncompressed TCP/IP */ 138 #define PPP_IPV6 0x0057 /* Internet Protocol Version 6 */ 139 #define PPP_LCP 0xc021 /* Link Control Protocol */ 140 #define PPP_PAP 0xc023 /* Password Authentication Protocol */ 141 #define PPP_CHAP 0xc223 /* Challenge-Handshake Auth Protocol */ 142 #define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */ 143 #define PPP_IPV6CP 0x8057 /* IPv6 Control Protocol */ 144 145 #define CONF_REQ 1 /* PPP configure request */ 146 #define CONF_ACK 2 /* PPP configure acknowledge */ 147 #define CONF_NAK 3 /* PPP configure negative ack */ 148 #define CONF_REJ 4 /* PPP configure reject */ 149 #define TERM_REQ 5 /* PPP terminate request */ 150 #define TERM_ACK 6 /* PPP terminate acknowledge */ 151 #define CODE_REJ 7 /* PPP code reject */ 152 #define PROTO_REJ 8 /* PPP protocol reject */ 153 #define ECHO_REQ 9 /* PPP echo request */ 154 #define ECHO_REPLY 10 /* PPP echo reply */ 155 #define DISC_REQ 11 /* PPP discard request */ 156 157 #define LCP_OPT_MRU 1 /* maximum receive unit */ 158 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ 159 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ 160 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ 161 #define LCP_OPT_MAGIC 5 /* magic number */ 162 #define LCP_OPT_RESERVED 6 /* reserved */ 163 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ 164 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ 165 166 #define IPCP_OPT_ADDRESSES 1 /* both IP addresses; deprecated */ 167 #define IPCP_OPT_COMPRESSION 2 /* IP compression protocol (VJ) */ 168 #define IPCP_OPT_ADDRESS 3 /* local IP address */ 169 170 #define IPV6CP_OPT_IFID 1 /* interface identifier */ 171 #define IPV6CP_OPT_COMPRESSION 2 /* IPv6 compression protocol */ 172 173 #define IPCP_COMP_VJ 0x2d /* Code for VJ compression */ 174 175 #define PAP_REQ 1 /* PAP name/password request */ 176 #define PAP_ACK 2 /* PAP acknowledge */ 177 #define PAP_NAK 3 /* PAP fail */ 178 179 #define CHAP_CHALLENGE 1 /* CHAP challenge request */ 180 #define CHAP_RESPONSE 2 /* CHAP challenge response */ 181 #define CHAP_SUCCESS 3 /* CHAP response ok */ 182 #define CHAP_FAILURE 4 /* CHAP response failed */ 183 184 #define CHAP_MD5 5 /* hash algorithm - MD5 */ 185 186 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 187 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 188 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 189 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 190 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 191 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 192 193 /* states are named and numbered according to RFC 1661 */ 194 #define STATE_INITIAL 0 195 #define STATE_STARTING 1 196 #define STATE_CLOSED 2 197 #define STATE_STOPPED 3 198 #define STATE_CLOSING 4 199 #define STATE_STOPPING 5 200 #define STATE_REQ_SENT 6 201 #define STATE_ACK_RCVD 7 202 #define STATE_ACK_SENT 8 203 #define STATE_OPENED 9 204 205 struct ppp_header { 206 u_char address; 207 u_char control; 208 u_short protocol; 209 } __attribute__((__packed__)); 210 #define PPP_HEADER_LEN sizeof (struct ppp_header) 211 212 struct lcp_header { 213 u_char type; 214 u_char ident; 215 u_short len; 216 } __attribute__((__packed__)); 217 #define LCP_HEADER_LEN sizeof (struct lcp_header) 218 219 struct cisco_packet { 220 u_long type; 221 u_long par1; 222 u_long par2; 223 u_short rel; 224 u_short time0; 225 u_short time1; 226 } __attribute__((__packed__)); 227 #define CISCO_PACKET_LEN sizeof (struct cisco_packet) 228 229 /* 230 * We follow the spelling and capitalization of RFC 1661 here, to make 231 * it easier comparing with the standard. Please refer to this RFC in 232 * case you can't make sense out of these abbreviation; it will also 233 * explain the semantics related to the various events and actions. 234 */ 235 struct cp { 236 u_short proto; /* PPP control protocol number */ 237 u_char protoidx; /* index into state table in struct sppp */ 238 u_char flags; 239 #define CP_LCP 0x01 /* this is the LCP */ 240 #define CP_AUTH 0x02 /* this is an authentication protocol */ 241 #define CP_NCP 0x04 /* this is a NCP */ 242 #define CP_QUAL 0x08 /* this is a quality reporting protocol */ 243 const char *name; /* name of this control protocol */ 244 /* event handlers */ 245 void (*Up)(struct sppp *sp); 246 void (*Down)(struct sppp *sp); 247 void (*Open)(struct sppp *sp); 248 void (*Close)(struct sppp *sp); 249 void (*TO)(void *sp); 250 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 251 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 252 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 253 /* actions */ 254 void (*tlu)(struct sppp *sp); 255 void (*tld)(struct sppp *sp); 256 void (*tls)(struct sppp *sp); 257 void (*tlf)(struct sppp *sp); 258 void (*scr)(struct sppp *sp); 259 }; 260 261 static struct sppp *spppq; 262 #if defined(__DragonFly__) 263 static struct callout keepalive_timeout; 264 #endif 265 266 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 && !defined(__DragonFly__) 267 #define SPP_FMT "%s%d: " 268 #define SPP_ARGS(ifp) (ifp)->if_name, (ifp)->if_unit 269 #else 270 #define SPP_FMT "%s: " 271 #define SPP_ARGS(ifp) (ifp)->if_xname 272 #endif 273 274 #ifdef INET 275 /* 276 * The following disgusting hack gets around the problem that IP TOS 277 * can't be set yet. We want to put "interactive" traffic on a high 278 * priority queue. To decide if traffic is interactive, we check that 279 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 280 * 281 * XXX is this really still necessary? - joerg - 282 */ 283 static u_short interactive_ports[8] = { 284 0, 513, 0, 0, 285 0, 21, 0, 23, 286 }; 287 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 288 #endif 289 290 /* almost every function needs these */ 291 #define STDDCL \ 292 struct ifnet *ifp = &sp->pp_if; \ 293 int debug = ifp->if_flags & IFF_DEBUG 294 295 static int sppp_output(struct ifnet *ifp, struct mbuf *m, 296 struct sockaddr *dst, struct rtentry *rt); 297 298 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2); 299 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 300 301 static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 302 struct mbuf *m); 303 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 304 u_char ident, u_short len, void *data); 305 /* static void sppp_cp_timeout(void *arg); */ 306 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 307 int newstate); 308 static void sppp_auth_send(const struct cp *cp, 309 struct sppp *sp, unsigned int type, unsigned int id, 310 ...); 311 312 static void sppp_up_event(const struct cp *cp, struct sppp *sp); 313 static void sppp_down_event(const struct cp *cp, struct sppp *sp); 314 static void sppp_open_event(const struct cp *cp, struct sppp *sp); 315 static void sppp_close_event(const struct cp *cp, struct sppp *sp); 316 static void sppp_to_event(const struct cp *cp, struct sppp *sp); 317 318 static void sppp_null(struct sppp *sp); 319 320 static void sppp_lcp_init(struct sppp *sp); 321 static void sppp_lcp_up(struct sppp *sp); 322 static void sppp_lcp_down(struct sppp *sp); 323 static void sppp_lcp_open(struct sppp *sp); 324 static void sppp_lcp_close(struct sppp *sp); 325 static void sppp_lcp_TO(void *sp); 326 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 327 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 328 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 329 static void sppp_lcp_tlu(struct sppp *sp); 330 static void sppp_lcp_tld(struct sppp *sp); 331 static void sppp_lcp_tls(struct sppp *sp); 332 static void sppp_lcp_tlf(struct sppp *sp); 333 static void sppp_lcp_scr(struct sppp *sp); 334 static void sppp_lcp_check_and_close(struct sppp *sp); 335 static int sppp_ncp_check(struct sppp *sp); 336 337 static void sppp_ipcp_init(struct sppp *sp); 338 static void sppp_ipcp_up(struct sppp *sp); 339 static void sppp_ipcp_down(struct sppp *sp); 340 static void sppp_ipcp_open(struct sppp *sp); 341 static void sppp_ipcp_close(struct sppp *sp); 342 static void sppp_ipcp_TO(void *sp); 343 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 344 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 345 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 346 static void sppp_ipcp_tlu(struct sppp *sp); 347 static void sppp_ipcp_tld(struct sppp *sp); 348 static void sppp_ipcp_tls(struct sppp *sp); 349 static void sppp_ipcp_tlf(struct sppp *sp); 350 static void sppp_ipcp_scr(struct sppp *sp); 351 352 static void sppp_ipv6cp_init(struct sppp *sp); 353 static void sppp_ipv6cp_up(struct sppp *sp); 354 static void sppp_ipv6cp_down(struct sppp *sp); 355 static void sppp_ipv6cp_open(struct sppp *sp); 356 static void sppp_ipv6cp_close(struct sppp *sp); 357 static void sppp_ipv6cp_TO(void *sp); 358 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 359 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 360 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 361 static void sppp_ipv6cp_tlu(struct sppp *sp); 362 static void sppp_ipv6cp_tld(struct sppp *sp); 363 static void sppp_ipv6cp_tls(struct sppp *sp); 364 static void sppp_ipv6cp_tlf(struct sppp *sp); 365 static void sppp_ipv6cp_scr(struct sppp *sp); 366 367 static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 368 static void sppp_pap_init(struct sppp *sp); 369 static void sppp_pap_open(struct sppp *sp); 370 static void sppp_pap_close(struct sppp *sp); 371 static void sppp_pap_TO(void *sp); 372 static void sppp_pap_my_TO(void *sp); 373 static void sppp_pap_tlu(struct sppp *sp); 374 static void sppp_pap_tld(struct sppp *sp); 375 static void sppp_pap_scr(struct sppp *sp); 376 377 static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 378 static void sppp_chap_init(struct sppp *sp); 379 static void sppp_chap_open(struct sppp *sp); 380 static void sppp_chap_close(struct sppp *sp); 381 static void sppp_chap_TO(void *sp); 382 static void sppp_chap_tlu(struct sppp *sp); 383 static void sppp_chap_tld(struct sppp *sp); 384 static void sppp_chap_scr(struct sppp *sp); 385 386 static const char *sppp_auth_type_name(u_short proto, u_char type); 387 static const char *sppp_cp_type_name(u_char type); 388 static const char *sppp_dotted_quad(u_long addr); 389 static const char *sppp_ipcp_opt_name(u_char opt); 390 #ifdef INET6 391 static const char *sppp_ipv6cp_opt_name(u_char opt); 392 #endif 393 static const char *sppp_lcp_opt_name(u_char opt); 394 static const char *sppp_phase_name(enum ppp_phase phase); 395 static const char *sppp_proto_name(u_short proto); 396 static const char *sppp_state_name(int state); 397 static int sppp_params(struct sppp *sp, u_long cmd, void *data); 398 static int sppp_strnlen(u_char *p, int max); 399 static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, 400 u_long *srcmask); 401 static void sppp_keepalive(void *dummy); 402 static void sppp_phase_network(struct sppp *sp); 403 static void sppp_print_bytes(const u_char *p, u_short len); 404 static void sppp_print_string(const char *p, u_short len); 405 static void sppp_set_ip_addr(struct sppp *sp, u_long src); 406 #ifdef INET6 407 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 408 struct in6_addr *dst, struct in6_addr *srcmask); 409 #ifdef IPV6CP_MYIFID_DYN 410 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 411 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 412 #endif 413 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 414 #endif 415 416 /* our control protocol descriptors */ 417 static const struct cp lcp = { 418 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 419 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 420 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 421 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 422 sppp_lcp_scr 423 }; 424 425 static const struct cp ipcp = { 426 PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp", 427 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 428 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 429 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 430 sppp_ipcp_scr 431 }; 432 433 static const struct cp ipv6cp = { 434 PPP_IPV6CP, IDX_IPV6CP, 435 #ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 436 CP_NCP, 437 #else 438 0, 439 #endif 440 "ipv6cp", 441 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 442 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 443 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 444 sppp_ipv6cp_scr 445 }; 446 447 static const struct cp pap = { 448 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 449 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 450 sppp_pap_TO, 0, 0, 0, 451 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 452 sppp_pap_scr 453 }; 454 455 static const struct cp chap = { 456 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 457 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 458 sppp_chap_TO, 0, 0, 0, 459 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 460 sppp_chap_scr 461 }; 462 463 static const struct cp *cps[IDX_COUNT] = { 464 &lcp, /* IDX_LCP */ 465 &ipcp, /* IDX_IPCP */ 466 &ipv6cp, /* IDX_IPV6CP */ 467 &pap, /* IDX_PAP */ 468 &chap, /* IDX_CHAP */ 469 }; 470 471 static int 472 sppp_modevent(module_t mod, int type, void *unused) 473 { 474 switch (type) { 475 case MOD_LOAD: 476 callout_init(&keepalive_timeout); 477 break; 478 case MOD_UNLOAD: 479 return EACCES; 480 break; 481 default: 482 break; 483 } 484 return 0; 485 } 486 static moduledata_t spppmod = { 487 "sppp", 488 sppp_modevent, 489 0 490 }; 491 MODULE_VERSION(sppp, 1); 492 DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY); 493 494 /* 495 * Exported functions, comprising our interface to the lower layer. 496 */ 497 498 /* 499 * Process the received packet. 500 */ 501 void 502 sppp_input(struct ifnet *ifp, struct mbuf *m) 503 { 504 struct ppp_header *h; 505 int isr = -1; 506 struct sppp *sp = (struct sppp *)ifp; 507 u_char *iphdr; 508 int hlen, vjlen, do_account = 0; 509 int debug = ifp->if_flags & IFF_DEBUG; 510 511 if (ifp->if_flags & IFF_UP) 512 /* Count received bytes, add FCS and one flag */ 513 ifp->if_ibytes += m->m_pkthdr.len + 3; 514 515 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 516 /* Too small packet, drop it. */ 517 if (debug) 518 log(LOG_DEBUG, 519 SPP_FMT "input packet is too small, %d bytes\n", 520 SPP_ARGS(ifp), m->m_pkthdr.len); 521 drop: 522 m_freem (m); 523 drop2: 524 ++ifp->if_ierrors; 525 ++ifp->if_iqdrops; 526 return; 527 } 528 529 /* Get PPP header. */ 530 h = mtod (m, struct ppp_header*); 531 m_adj (m, PPP_HEADER_LEN); 532 533 switch (h->address) { 534 case PPP_ALLSTATIONS: 535 if (h->control != PPP_UI) 536 goto invalid; 537 if (sp->pp_mode == IFF_CISCO) { 538 if (debug) 539 log(LOG_DEBUG, 540 SPP_FMT "PPP packet in Cisco mode " 541 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 542 SPP_ARGS(ifp), 543 h->address, h->control, ntohs(h->protocol)); 544 goto drop; 545 } 546 switch (ntohs (h->protocol)) { 547 default: 548 if (debug) 549 log(LOG_DEBUG, 550 SPP_FMT "rejecting protocol " 551 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 552 SPP_ARGS(ifp), 553 h->address, h->control, ntohs(h->protocol)); 554 if (sp->state[IDX_LCP] == STATE_OPENED) 555 sppp_cp_send (sp, PPP_LCP, PROTO_REJ, 556 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 557 &h->protocol); 558 ++ifp->if_noproto; 559 goto drop; 560 case PPP_LCP: 561 sppp_cp_input(&lcp, sp, m); 562 m_freem (m); 563 return; 564 case PPP_PAP: 565 if (sp->pp_phase >= PHASE_AUTHENTICATE) 566 sppp_pap_input(sp, m); 567 m_freem (m); 568 return; 569 case PPP_CHAP: 570 if (sp->pp_phase >= PHASE_AUTHENTICATE) 571 sppp_chap_input(sp, m); 572 m_freem (m); 573 return; 574 #ifdef INET 575 case PPP_IPCP: 576 if (sp->pp_phase == PHASE_NETWORK) 577 sppp_cp_input(&ipcp, sp, m); 578 m_freem (m); 579 return; 580 case PPP_IP: 581 if (sp->state[IDX_IPCP] == STATE_OPENED) { 582 isr = NETISR_IP; 583 } 584 do_account++; 585 break; 586 case PPP_VJ_COMP: 587 if (sp->state[IDX_IPCP] == STATE_OPENED) { 588 if ((vjlen = 589 sl_uncompress_tcp_core(mtod(m, u_char *), 590 m->m_len, m->m_len, 591 TYPE_COMPRESSED_TCP, 592 sp->pp_comp, 593 &iphdr, &hlen)) <= 0) { 594 if (debug) 595 log(LOG_INFO, 596 SPP_FMT "VJ uncompress failed on compressed packet\n", 597 SPP_ARGS(ifp)); 598 goto drop; 599 } 600 601 /* 602 * Trim the VJ header off the packet, and prepend 603 * the uncompressed IP header (which will usually 604 * end up in two chained mbufs since there's not 605 * enough leading space in the existing mbuf). 606 */ 607 m_adj(m, vjlen); 608 M_PREPEND(m, hlen, MB_DONTWAIT); 609 if (m == NULL) 610 goto drop2; 611 bcopy(iphdr, mtod(m, u_char *), hlen); 612 613 isr = NETISR_IP; 614 } 615 do_account++; 616 break; 617 case PPP_VJ_UCOMP: 618 if (sp->state[IDX_IPCP] == STATE_OPENED) { 619 if (sl_uncompress_tcp_core(mtod(m, u_char *), 620 m->m_len, m->m_len, 621 TYPE_UNCOMPRESSED_TCP, 622 sp->pp_comp, 623 &iphdr, &hlen) != 0) { 624 if (debug) 625 log(LOG_INFO, 626 SPP_FMT "VJ uncompress failed on uncompressed packet\n", 627 SPP_ARGS(ifp)); 628 goto drop; 629 } 630 isr = NETISR_IP; 631 } 632 do_account++; 633 break; 634 #endif 635 #ifdef INET6 636 case PPP_IPV6CP: 637 if (sp->pp_phase == PHASE_NETWORK) 638 sppp_cp_input(&ipv6cp, sp, m); 639 m_freem (m); 640 return; 641 642 case PPP_IPV6: 643 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 644 isr = NETISR_IPV6; 645 } 646 do_account++; 647 break; 648 #endif 649 #ifdef IPX 650 case PPP_IPX: 651 /* IPX IPXCP not implemented yet */ 652 if (sp->pp_phase == PHASE_NETWORK) { 653 isr = NETISR_IPX; 654 } 655 do_account++; 656 break; 657 #endif 658 #ifdef NS 659 case PPP_XNS: 660 /* XNS IDPCP not implemented yet */ 661 if (sp->pp_phase == PHASE_NETWORK) { 662 isr = NETISR_NS; 663 } 664 do_account++; 665 break; 666 #endif 667 } 668 break; 669 case CISCO_MULTICAST: 670 case CISCO_UNICAST: 671 /* Don't check the control field here (RFC 1547). */ 672 if (sp->pp_mode != IFF_CISCO) { 673 if (debug) 674 log(LOG_DEBUG, 675 SPP_FMT "Cisco packet in PPP mode " 676 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 677 SPP_ARGS(ifp), 678 h->address, h->control, ntohs(h->protocol)); 679 goto drop; 680 } 681 switch (ntohs (h->protocol)) { 682 default: 683 ++ifp->if_noproto; 684 goto invalid; 685 case CISCO_KEEPALIVE: 686 sppp_cisco_input ((struct sppp*) ifp, m); 687 m_freem (m); 688 return; 689 #ifdef INET 690 case ETHERTYPE_IP: 691 isr = NETISR_IP; 692 do_account++; 693 break; 694 #endif 695 #ifdef INET6 696 case ETHERTYPE_IPV6: 697 isr = NETISR_IPV6; 698 do_account++; 699 break; 700 #endif 701 #ifdef IPX 702 case ETHERTYPE_IPX: 703 isr = NETISR_IPX; 704 do_account++; 705 break; 706 #endif 707 #ifdef NS 708 case ETHERTYPE_NS: 709 isr = NETISR_NS 710 do_account++; 711 break; 712 #endif 713 } 714 break; 715 default: /* Invalid PPP packet. */ 716 invalid: 717 if (debug) 718 log(LOG_DEBUG, 719 SPP_FMT "invalid input packet " 720 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 721 SPP_ARGS(ifp), 722 h->address, h->control, ntohs(h->protocol)); 723 goto drop; 724 } 725 726 if (! (ifp->if_flags & IFF_UP) || isr < 0) 727 goto drop; 728 729 /* Check queue. */ 730 731 netisr_dispatch(isr, m); 732 if (do_account) 733 /* 734 * Do only account for network packets, not for control 735 * packets. This is used by some subsystems to detect 736 * idle lines. 737 */ 738 sp->pp_last_recv = time_second; 739 } 740 741 /* 742 * Enqueue transmit packet. 743 */ 744 static int 745 sppp_output_serialized(struct ifnet *ifp, struct mbuf *m, 746 struct sockaddr *dst, struct rtentry *rt) 747 { 748 struct sppp *sp = (struct sppp*) ifp; 749 struct ppp_header *h; 750 struct ifqueue *ifq = NULL; 751 int rv = 0; 752 int ipproto = PPP_IP; 753 int debug = ifp->if_flags & IFF_DEBUG; 754 struct altq_pktattr pktattr; 755 756 crit_enter(); 757 758 if ((ifp->if_flags & IFF_UP) == 0 || 759 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 760 #ifdef INET6 761 drop: 762 #endif 763 m_freem (m); 764 crit_exit(); 765 return (ENETDOWN); 766 } 767 768 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 769 #ifdef INET6 770 /* 771 * XXX 772 * 773 * Hack to prevent the initialization-time generated 774 * IPv6 multicast packet to erroneously cause a 775 * dialout event in case IPv6 has been 776 * administratively disabled on that interface. 777 */ 778 if (dst->sa_family == AF_INET6 && 779 !(sp->confflags & CONF_ENABLE_IPV6)) 780 goto drop; 781 #endif 782 /* 783 * Interface is not yet running, but auto-dial. Need 784 * to start LCP for it. 785 */ 786 ifp->if_flags |= IFF_RUNNING; 787 crit_exit(); 788 lcp.Open(sp); 789 crit_enter(); 790 } 791 792 /* 793 * if the queueing discipline needs packet classification, 794 * do it before prepending link headers. 795 */ 796 ifq_classify(&ifp->if_snd, m, dst->sa_family, &pktattr); 797 798 #ifdef INET 799 if (dst->sa_family == AF_INET) { 800 /* XXX Check mbuf length here? */ 801 struct ip *ip = mtod (m, struct ip*); 802 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl); 803 804 /* 805 * When using dynamic local IP address assignment by using 806 * 0.0.0.0 as a local address, the first TCP session will 807 * not connect because the local TCP checksum is computed 808 * using 0.0.0.0 which will later become our real IP address 809 * so the TCP checksum computed at the remote end will 810 * become invalid. So we 811 * - don't let packets with src ip addr 0 thru 812 * - we flag TCP packets with src ip 0 as an error 813 */ 814 815 if(ip->ip_src.s_addr == INADDR_ANY) /* -hm */ 816 { 817 m_freem(m); 818 crit_exit(); 819 if(ip->ip_p == IPPROTO_TCP) 820 return(EADDRNOTAVAIL); 821 else 822 return(0); 823 } 824 825 /* 826 * Put low delay, telnet, rlogin and ftp control packets 827 * in front of the queue. 828 */ 829 if (IF_QFULL (&sp->pp_fastq)) 830 ; 831 else if (ip->ip_tos & IPTOS_LOWDELAY) 832 ifq = &sp->pp_fastq; 833 else if (m->m_len < sizeof *ip + sizeof *tcp) 834 ; 835 else if (ip->ip_p != IPPROTO_TCP) 836 ; 837 else if (INTERACTIVE (ntohs (tcp->th_sport))) 838 ifq = &sp->pp_fastq; 839 else if (INTERACTIVE (ntohs (tcp->th_dport))) 840 ifq = &sp->pp_fastq; 841 842 /* 843 * Do IP Header compression 844 */ 845 if (sp->pp_mode != IFF_CISCO && (sp->ipcp.flags & IPCP_VJ) && 846 ip->ip_p == IPPROTO_TCP) 847 switch (sl_compress_tcp(m, ip, sp->pp_comp, 848 sp->ipcp.compress_cid)) { 849 case TYPE_COMPRESSED_TCP: 850 ipproto = PPP_VJ_COMP; 851 break; 852 case TYPE_UNCOMPRESSED_TCP: 853 ipproto = PPP_VJ_UCOMP; 854 break; 855 case TYPE_IP: 856 ipproto = PPP_IP; 857 break; 858 default: 859 m_freem(m); 860 crit_exit(); 861 return (EINVAL); 862 } 863 } 864 #endif 865 866 #ifdef INET6 867 if (dst->sa_family == AF_INET6) { 868 /* XXX do something tricky here? */ 869 } 870 #endif 871 872 /* 873 * Prepend general data packet PPP header. For now, IP only. 874 */ 875 M_PREPEND (m, PPP_HEADER_LEN, MB_DONTWAIT); 876 if (! m) { 877 if (debug) 878 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n", 879 SPP_ARGS(ifp)); 880 ++ifp->if_oerrors; 881 crit_exit(); 882 return (ENOBUFS); 883 } 884 /* 885 * May want to check size of packet 886 * (albeit due to the implementation it's always enough) 887 */ 888 h = mtod (m, struct ppp_header*); 889 if (sp->pp_mode == IFF_CISCO) { 890 h->address = CISCO_UNICAST; /* unicast address */ 891 h->control = 0; 892 } else { 893 h->address = PPP_ALLSTATIONS; /* broadcast address */ 894 h->control = PPP_UI; /* Unnumbered Info */ 895 } 896 897 switch (dst->sa_family) { 898 #ifdef INET 899 case AF_INET: /* Internet Protocol */ 900 if (sp->pp_mode == IFF_CISCO) 901 h->protocol = htons (ETHERTYPE_IP); 902 else { 903 /* 904 * Don't choke with an ENETDOWN early. It's 905 * possible that we just started dialing out, 906 * so don't drop the packet immediately. If 907 * we notice that we run out of buffer space 908 * below, we will however remember that we are 909 * not ready to carry IP packets, and return 910 * ENETDOWN, as opposed to ENOBUFS. 911 */ 912 h->protocol = htons(ipproto); 913 if (sp->state[IDX_IPCP] != STATE_OPENED) 914 rv = ENETDOWN; 915 } 916 break; 917 #endif 918 #ifdef INET6 919 case AF_INET6: /* Internet Protocol */ 920 if (sp->pp_mode == IFF_CISCO) 921 h->protocol = htons (ETHERTYPE_IPV6); 922 else { 923 /* 924 * Don't choke with an ENETDOWN early. It's 925 * possible that we just started dialing out, 926 * so don't drop the packet immediately. If 927 * we notice that we run out of buffer space 928 * below, we will however remember that we are 929 * not ready to carry IP packets, and return 930 * ENETDOWN, as opposed to ENOBUFS. 931 */ 932 h->protocol = htons(PPP_IPV6); 933 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 934 rv = ENETDOWN; 935 } 936 break; 937 #endif 938 #ifdef NS 939 case AF_NS: /* Xerox NS Protocol */ 940 h->protocol = htons (sp->pp_mode == IFF_CISCO ? 941 ETHERTYPE_NS : PPP_XNS); 942 break; 943 #endif 944 #ifdef IPX 945 case AF_IPX: /* Novell IPX Protocol */ 946 h->protocol = htons (sp->pp_mode == IFF_CISCO ? 947 ETHERTYPE_IPX : PPP_IPX); 948 break; 949 #endif 950 default: 951 m_freem (m); 952 ++ifp->if_oerrors; 953 crit_exit(); 954 return (EAFNOSUPPORT); 955 } 956 957 /* 958 * Queue message on interface, and start output if interface 959 * not yet active. 960 */ 961 if (ifq != NULL) { 962 if (IF_QFULL(ifq)) { 963 IF_DROP(ifq); 964 m_freem(m); 965 rv = ENOBUFS; 966 ifq->ifq_drops++; 967 } else { 968 IF_ENQUEUE(ifq, m); 969 rv = 0; 970 } 971 } else { 972 rv = ifq_enqueue(&ifp->if_snd, m, &pktattr); 973 } 974 if (rv) { 975 ++ifp->if_oerrors; 976 crit_exit(); 977 return(rv); 978 } 979 if (! (ifp->if_flags & IFF_OACTIVE)) 980 (*ifp->if_start) (ifp); 981 982 /* 983 * Count output packets and bytes. 984 * The packet length includes header, FCS and 1 flag, 985 * according to RFC 1333. 986 */ 987 ifp->if_obytes += m->m_pkthdr.len + 3; 988 989 /* 990 * Unlike in sppp_input(), we can always bump the timestamp 991 * here since sppp_output() is only called on behalf of 992 * network-layer traffic; control-layer traffic is handled 993 * by sppp_cp_send(). 994 */ 995 sp->pp_last_sent = time_second; 996 997 crit_exit(); 998 return (0); 999 } 1000 1001 static int 1002 sppp_output(struct ifnet *ifp, struct mbuf *m, 1003 struct sockaddr *dst, struct rtentry *rt) 1004 { 1005 int error; 1006 1007 ifnet_serialize_tx(ifp); 1008 error = sppp_output_serialized(ifp, m, dst, rt); 1009 ifnet_deserialize_tx(ifp); 1010 1011 return error; 1012 } 1013 1014 void 1015 sppp_attach(struct ifnet *ifp) 1016 { 1017 struct sppp *sp = (struct sppp*) ifp; 1018 1019 /* Initialize keepalive handler. */ 1020 if (!spppq) { 1021 callout_reset(&keepalive_timeout, hz * 10, 1022 sppp_keepalive, NULL); 1023 } 1024 /* Insert new entry into the keepalive list. */ 1025 sp->pp_next = spppq; 1026 spppq = sp; 1027 1028 sp->pp_if.if_mtu = PP_MTU; 1029 sp->pp_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 1030 sp->pp_if.if_type = IFT_PPP; 1031 sp->pp_if.if_output = sppp_output; 1032 #if 0 1033 sp->pp_flags = PP_KEEPALIVE; 1034 #endif 1035 sp->pp_if.if_snd.ifq_maxlen = 32; 1036 sp->pp_fastq.ifq_maxlen = 32; 1037 sp->pp_cpq.ifq_maxlen = 20; 1038 sp->pp_loopcnt = 0; 1039 sp->pp_alivecnt = 0; 1040 bzero(&sp->pp_seq[0], sizeof(sp->pp_seq)); 1041 bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq)); 1042 sp->pp_phase = PHASE_DEAD; 1043 sp->pp_up = lcp.Up; 1044 sp->pp_down = lcp.Down; 1045 sp->pp_last_recv = sp->pp_last_sent = time_second; 1046 sp->confflags = 0; 1047 #ifdef INET 1048 sp->confflags |= CONF_ENABLE_VJ; 1049 #endif 1050 #ifdef INET6 1051 sp->confflags |= CONF_ENABLE_IPV6; 1052 #endif 1053 sp->pp_comp = kmalloc(sizeof(struct slcompress), M_TEMP, M_WAITOK); 1054 sl_compress_init(sp->pp_comp, -1); 1055 sppp_lcp_init(sp); 1056 sppp_ipcp_init(sp); 1057 sppp_ipv6cp_init(sp); 1058 sppp_pap_init(sp); 1059 sppp_chap_init(sp); 1060 } 1061 1062 void 1063 sppp_detach(struct ifnet *ifp) 1064 { 1065 struct sppp **q, *p, *sp = (struct sppp*) ifp; 1066 int i; 1067 1068 /* Remove the entry from the keepalive list. */ 1069 for (q = &spppq; (p = *q); q = &p->pp_next) 1070 if (p == sp) { 1071 *q = p->pp_next; 1072 break; 1073 } 1074 1075 /* Stop keepalive handler. */ 1076 if (!spppq) 1077 callout_stop(&keepalive_timeout); 1078 1079 for (i = 0; i < IDX_COUNT; i++) 1080 callout_stop(&sp->timeout[i]); 1081 callout_stop(&sp->pap_my_to); 1082 } 1083 1084 /* 1085 * Flush the interface output queue. 1086 */ 1087 void 1088 sppp_flush(struct ifnet *ifp) 1089 { 1090 struct sppp *sp = (struct sppp*) ifp; 1091 1092 ifq_purge(&sp->pp_if.if_snd); 1093 IF_DRAIN(&sp->pp_fastq); 1094 IF_DRAIN(&sp->pp_cpq); 1095 } 1096 1097 /* 1098 * Check if the output queue is empty. 1099 */ 1100 int 1101 sppp_isempty(struct ifnet *ifp) 1102 { 1103 struct sppp *sp = (struct sppp*) ifp; 1104 int empty; 1105 1106 crit_enter(); 1107 empty = IF_QEMPTY(&sp->pp_fastq) && IF_QEMPTY(&sp->pp_cpq) && 1108 ifq_is_empty(&sp->pp_if.if_snd); 1109 crit_exit(); 1110 return (empty); 1111 } 1112 1113 /* 1114 * Get next packet to send. 1115 */ 1116 struct mbuf * 1117 sppp_dequeue(struct ifnet *ifp) 1118 { 1119 struct sppp *sp = (struct sppp*) ifp; 1120 struct mbuf *m; 1121 1122 crit_enter(); 1123 1124 /* 1125 * Process only the control protocol queue until we have at 1126 * least one NCP open. 1127 * 1128 * Do always serve all three queues in Cisco mode. 1129 */ 1130 IF_DEQUEUE(&sp->pp_cpq, m); 1131 if (m == NULL && 1132 (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO)) { 1133 IF_DEQUEUE(&sp->pp_fastq, m); 1134 if (m == NULL) 1135 m = ifq_dequeue(&sp->pp_if.if_snd, NULL); 1136 } 1137 1138 crit_exit(); 1139 return m; 1140 } 1141 1142 /* 1143 * Pick the next packet, do not remove it from the queue. 1144 */ 1145 struct mbuf * 1146 sppp_pick(struct ifnet *ifp) 1147 { 1148 struct sppp *sp = (struct sppp*)ifp; 1149 struct mbuf *m; 1150 1151 crit_enter(); 1152 1153 m = sp->pp_cpq.ifq_head; 1154 if (m == NULL && 1155 (sp->pp_phase == PHASE_NETWORK || sp->pp_mode == IFF_CISCO)) { 1156 if ((m = sp->pp_fastq.ifq_head) == NULL) 1157 m = ifq_poll(&sp->pp_if.if_snd); 1158 } 1159 1160 crit_exit(); 1161 return (m); 1162 } 1163 1164 /* 1165 * Process an ioctl request. Called on low priority level. 1166 */ 1167 int 1168 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data) 1169 { 1170 struct ifreq *ifr = (struct ifreq*) data; 1171 struct sppp *sp = (struct sppp*) ifp; 1172 int rv, going_up, going_down, newmode; 1173 1174 crit_enter(); 1175 1176 rv = 0; 1177 switch (cmd) { 1178 case SIOCAIFADDR: 1179 case SIOCSIFDSTADDR: 1180 break; 1181 1182 case SIOCSIFADDR: 1183 /* set the interface "up" when assigning an IP address */ 1184 ifp->if_flags |= IFF_UP; 1185 /* fall through... */ 1186 1187 case SIOCSIFFLAGS: 1188 going_up = ifp->if_flags & IFF_UP && 1189 (ifp->if_flags & IFF_RUNNING) == 0; 1190 going_down = (ifp->if_flags & IFF_UP) == 0 && 1191 ifp->if_flags & IFF_RUNNING; 1192 1193 newmode = ifp->if_flags & IFF_PASSIVE; 1194 if (!newmode) 1195 newmode = ifp->if_flags & IFF_AUTO; 1196 if (!newmode) 1197 newmode = ifp->if_flags & IFF_CISCO; 1198 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO); 1199 ifp->if_flags |= newmode; 1200 1201 if (newmode != sp->pp_mode) { 1202 going_down = 1; 1203 if (!going_up) 1204 going_up = ifp->if_flags & IFF_RUNNING; 1205 } 1206 1207 if (going_down) { 1208 if (sp->pp_mode != IFF_CISCO) 1209 lcp.Close(sp); 1210 else if (sp->pp_tlf) 1211 (sp->pp_tlf)(sp); 1212 sppp_flush(ifp); 1213 ifp->if_flags &= ~IFF_RUNNING; 1214 sp->pp_mode = newmode; 1215 } 1216 1217 if (going_up) { 1218 if (sp->pp_mode != IFF_CISCO) 1219 lcp.Close(sp); 1220 sp->pp_mode = newmode; 1221 if (sp->pp_mode == 0) { 1222 ifp->if_flags |= IFF_RUNNING; 1223 lcp.Open(sp); 1224 } 1225 if (sp->pp_mode == IFF_CISCO) { 1226 if (sp->pp_tls) 1227 (sp->pp_tls)(sp); 1228 ifp->if_flags |= IFF_RUNNING; 1229 } 1230 } 1231 1232 break; 1233 1234 #ifdef SIOCSIFMTU 1235 #ifndef ifr_mtu 1236 #define ifr_mtu ifr_metric 1237 #endif 1238 case SIOCSIFMTU: 1239 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) 1240 return (EINVAL); 1241 ifp->if_mtu = ifr->ifr_mtu; 1242 break; 1243 #endif 1244 #ifdef SLIOCSETMTU 1245 case SLIOCSETMTU: 1246 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru) 1247 return (EINVAL); 1248 ifp->if_mtu = *(short*)data; 1249 break; 1250 #endif 1251 #ifdef SIOCGIFMTU 1252 case SIOCGIFMTU: 1253 ifr->ifr_mtu = ifp->if_mtu; 1254 break; 1255 #endif 1256 #ifdef SLIOCGETMTU 1257 case SLIOCGETMTU: 1258 *(short*)data = ifp->if_mtu; 1259 break; 1260 #endif 1261 case SIOCADDMULTI: 1262 case SIOCDELMULTI: 1263 break; 1264 1265 case SIOCGIFGENERIC: 1266 case SIOCSIFGENERIC: 1267 rv = sppp_params(sp, cmd, data); 1268 break; 1269 1270 default: 1271 rv = ENOTTY; 1272 } 1273 1274 crit_exit(); 1275 return rv; 1276 } 1277 1278 /* 1279 * Cisco framing implementation. 1280 */ 1281 1282 /* 1283 * Handle incoming Cisco keepalive protocol packets. 1284 */ 1285 static void 1286 sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1287 { 1288 STDDCL; 1289 struct cisco_packet *h; 1290 u_long me, mymask; 1291 1292 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1293 if (debug) 1294 log(LOG_DEBUG, 1295 SPP_FMT "cisco invalid packet length: %d bytes\n", 1296 SPP_ARGS(ifp), m->m_pkthdr.len); 1297 return; 1298 } 1299 h = mtod (m, struct cisco_packet*); 1300 if (debug) 1301 log(LOG_DEBUG, 1302 SPP_FMT "cisco input: %d bytes " 1303 "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n", 1304 SPP_ARGS(ifp), m->m_pkthdr.len, 1305 (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel, 1306 (u_int)h->time0, (u_int)h->time1); 1307 switch (ntohl (h->type)) { 1308 default: 1309 if (debug) 1310 log(-1, SPP_FMT "cisco unknown packet type: 0x%lx\n", 1311 SPP_ARGS(ifp), (u_long)ntohl (h->type)); 1312 break; 1313 case CISCO_ADDR_REPLY: 1314 /* Reply on address request, ignore */ 1315 break; 1316 case CISCO_KEEPALIVE_REQ: 1317 sp->pp_alivecnt = 0; 1318 sp->pp_rseq[IDX_LCP] = ntohl (h->par1); 1319 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1320 /* Local and remote sequence numbers are equal. 1321 * Probably, the line is in loopback mode. */ 1322 if (sp->pp_loopcnt >= MAXALIVECNT) { 1323 kprintf (SPP_FMT "loopback\n", 1324 SPP_ARGS(ifp)); 1325 sp->pp_loopcnt = 0; 1326 if (ifp->if_flags & IFF_UP) { 1327 if_down (ifp); 1328 IF_DRAIN(&sp->pp_cpq); 1329 } 1330 } 1331 ++sp->pp_loopcnt; 1332 1333 /* Generate new local sequence number */ 1334 #if defined(__DragonFly__) 1335 sp->pp_seq[IDX_LCP] = krandom(); 1336 #else 1337 sp->pp_seq[IDX_LCP] ^= time.tv_sec ^ time.tv_usec; 1338 #endif 1339 break; 1340 } 1341 sp->pp_loopcnt = 0; 1342 if (! (ifp->if_flags & IFF_UP) && 1343 (ifp->if_flags & IFF_RUNNING)) { 1344 if_up(ifp); 1345 kprintf (SPP_FMT "up\n", SPP_ARGS(ifp)); 1346 } 1347 break; 1348 case CISCO_ADDR_REQ: 1349 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1350 if (me != 0L) 1351 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1352 break; 1353 } 1354 } 1355 1356 /* 1357 * Send Cisco keepalive packet. 1358 */ 1359 static void 1360 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2) 1361 { 1362 STDDCL; 1363 struct ppp_header *h; 1364 struct cisco_packet *ch; 1365 struct mbuf *m; 1366 #if defined(__DragonFly__) 1367 struct timeval tv; 1368 #else 1369 u_long t = (time.tv_sec - boottime.tv_sec) * 1000; 1370 #endif 1371 1372 #if defined(__DragonFly__) 1373 getmicrouptime(&tv); 1374 #endif 1375 1376 MGETHDR (m, MB_DONTWAIT, MT_DATA); 1377 if (! m) 1378 return; 1379 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1380 m->m_pkthdr.rcvif = 0; 1381 1382 h = mtod (m, struct ppp_header*); 1383 h->address = CISCO_MULTICAST; 1384 h->control = 0; 1385 h->protocol = htons (CISCO_KEEPALIVE); 1386 1387 ch = (struct cisco_packet*) (h + 1); 1388 ch->type = htonl (type); 1389 ch->par1 = htonl (par1); 1390 ch->par2 = htonl (par2); 1391 ch->rel = -1; 1392 1393 #if defined(__DragonFly__) 1394 ch->time0 = htons ((u_short) (tv.tv_sec >> 16)); 1395 ch->time1 = htons ((u_short) tv.tv_sec); 1396 #else 1397 ch->time0 = htons ((u_short) (t >> 16)); 1398 ch->time1 = htons ((u_short) t); 1399 #endif 1400 1401 if (debug) 1402 log(LOG_DEBUG, 1403 SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n", 1404 SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1, 1405 (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1); 1406 1407 if (IF_QFULL (&sp->pp_cpq)) { 1408 IF_DROP (&sp->pp_fastq); 1409 IF_DROP (&ifp->if_snd); 1410 m_freem (m); 1411 } else 1412 IF_ENQUEUE (&sp->pp_cpq, m); 1413 if (! (ifp->if_flags & IFF_OACTIVE)) 1414 (*ifp->if_start) (ifp); 1415 ifp->if_obytes += m->m_pkthdr.len + 3; 1416 } 1417 1418 /* 1419 * PPP protocol implementation. 1420 */ 1421 1422 /* 1423 * Send PPP control protocol packet. 1424 */ 1425 static void 1426 sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1427 u_char ident, u_short len, void *data) 1428 { 1429 STDDCL; 1430 struct ppp_header *h; 1431 struct lcp_header *lh; 1432 struct mbuf *m; 1433 1434 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) 1435 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN; 1436 MGETHDR (m, MB_DONTWAIT, MT_DATA); 1437 if (! m) 1438 return; 1439 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len; 1440 m->m_pkthdr.rcvif = 0; 1441 1442 h = mtod (m, struct ppp_header*); 1443 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1444 h->control = PPP_UI; /* Unnumbered Info */ 1445 h->protocol = htons (proto); /* Link Control Protocol */ 1446 1447 lh = (struct lcp_header*) (h + 1); 1448 lh->type = type; 1449 lh->ident = ident; 1450 lh->len = htons (LCP_HEADER_LEN + len); 1451 if (len) 1452 bcopy (data, lh+1, len); 1453 1454 if (debug) { 1455 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 1456 SPP_ARGS(ifp), 1457 sppp_proto_name(proto), 1458 sppp_cp_type_name (lh->type), lh->ident, 1459 ntohs (lh->len)); 1460 sppp_print_bytes ((u_char*) (lh+1), len); 1461 log(-1, ">\n"); 1462 } 1463 if (IF_QFULL (&sp->pp_cpq)) { 1464 IF_DROP (&sp->pp_fastq); 1465 IF_DROP (&ifp->if_snd); 1466 m_freem (m); 1467 ++ifp->if_oerrors; 1468 } else 1469 IF_ENQUEUE (&sp->pp_cpq, m); 1470 if (! (ifp->if_flags & IFF_OACTIVE)) 1471 (*ifp->if_start) (ifp); 1472 ifp->if_obytes += m->m_pkthdr.len + 3; 1473 } 1474 1475 /* 1476 * Handle incoming PPP control protocol packets. 1477 */ 1478 static void 1479 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1480 { 1481 STDDCL; 1482 struct lcp_header *h; 1483 int printlen, len = m->m_pkthdr.len; 1484 int rv; 1485 u_char *p; 1486 1487 if (len < 4) { 1488 if (debug) 1489 log(LOG_DEBUG, 1490 SPP_FMT "%s invalid packet length: %d bytes\n", 1491 SPP_ARGS(ifp), cp->name, len); 1492 return; 1493 } 1494 h = mtod (m, struct lcp_header*); 1495 if (debug) { 1496 printlen = ntohs(h->len); 1497 log(LOG_DEBUG, 1498 SPP_FMT "%s input(%s): <%s id=0x%x len=%d", 1499 SPP_ARGS(ifp), cp->name, 1500 sppp_state_name(sp->state[cp->protoidx]), 1501 sppp_cp_type_name (h->type), h->ident, printlen); 1502 if (len < printlen) 1503 printlen = len; 1504 if (printlen > 4) 1505 sppp_print_bytes ((u_char*) (h+1), printlen - 4); 1506 log(-1, ">\n"); 1507 } 1508 if (len > ntohs (h->len)) 1509 len = ntohs (h->len); 1510 p = (u_char *)(h + 1); 1511 switch (h->type) { 1512 case CONF_REQ: 1513 if (len < 4) { 1514 if (debug) 1515 log(-1, SPP_FMT "%s invalid conf-req length %d\n", 1516 SPP_ARGS(ifp), cp->name, 1517 len); 1518 ++ifp->if_ierrors; 1519 break; 1520 } 1521 /* handle states where RCR doesn't get a SCA/SCN */ 1522 switch (sp->state[cp->protoidx]) { 1523 case STATE_CLOSING: 1524 case STATE_STOPPING: 1525 return; 1526 case STATE_CLOSED: 1527 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1528 0, 0); 1529 return; 1530 } 1531 rv = (cp->RCR)(sp, h, len); 1532 if (rv < 0) { 1533 /* fatal error, shut down */ 1534 (cp->tld)(sp); 1535 sppp_lcp_tlf(sp); 1536 return; 1537 } 1538 switch (sp->state[cp->protoidx]) { 1539 case STATE_OPENED: 1540 (cp->tld)(sp); 1541 (cp->scr)(sp); 1542 /* fall through... */ 1543 case STATE_ACK_SENT: 1544 case STATE_REQ_SENT: 1545 /* 1546 * sppp_cp_change_state() have the side effect of 1547 * restarting the timeouts. We want to avoid that 1548 * if the state don't change, otherwise we won't 1549 * ever timeout and resend a configuration request 1550 * that got lost. 1551 */ 1552 if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT: 1553 STATE_REQ_SENT)) 1554 break; 1555 sppp_cp_change_state(cp, sp, rv? 1556 STATE_ACK_SENT: STATE_REQ_SENT); 1557 break; 1558 case STATE_STOPPED: 1559 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1560 (cp->scr)(sp); 1561 sppp_cp_change_state(cp, sp, rv? 1562 STATE_ACK_SENT: STATE_REQ_SENT); 1563 break; 1564 case STATE_ACK_RCVD: 1565 if (rv) { 1566 sppp_cp_change_state(cp, sp, STATE_OPENED); 1567 if (debug) 1568 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1569 SPP_ARGS(ifp), 1570 cp->name); 1571 (cp->tlu)(sp); 1572 } else 1573 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1574 break; 1575 default: 1576 kprintf(SPP_FMT "%s illegal %s in state %s\n", 1577 SPP_ARGS(ifp), cp->name, 1578 sppp_cp_type_name(h->type), 1579 sppp_state_name(sp->state[cp->protoidx])); 1580 ++ifp->if_ierrors; 1581 } 1582 break; 1583 case CONF_ACK: 1584 if (h->ident != sp->confid[cp->protoidx]) { 1585 if (debug) 1586 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1587 SPP_ARGS(ifp), cp->name, 1588 h->ident, sp->confid[cp->protoidx]); 1589 ++ifp->if_ierrors; 1590 break; 1591 } 1592 switch (sp->state[cp->protoidx]) { 1593 case STATE_CLOSED: 1594 case STATE_STOPPED: 1595 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1596 break; 1597 case STATE_CLOSING: 1598 case STATE_STOPPING: 1599 break; 1600 case STATE_REQ_SENT: 1601 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1602 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1603 break; 1604 case STATE_OPENED: 1605 (cp->tld)(sp); 1606 /* fall through */ 1607 case STATE_ACK_RCVD: 1608 (cp->scr)(sp); 1609 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1610 break; 1611 case STATE_ACK_SENT: 1612 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1613 sppp_cp_change_state(cp, sp, STATE_OPENED); 1614 if (debug) 1615 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1616 SPP_ARGS(ifp), cp->name); 1617 (cp->tlu)(sp); 1618 break; 1619 default: 1620 kprintf(SPP_FMT "%s illegal %s in state %s\n", 1621 SPP_ARGS(ifp), cp->name, 1622 sppp_cp_type_name(h->type), 1623 sppp_state_name(sp->state[cp->protoidx])); 1624 ++ifp->if_ierrors; 1625 } 1626 break; 1627 case CONF_NAK: 1628 case CONF_REJ: 1629 if (h->ident != sp->confid[cp->protoidx]) { 1630 if (debug) 1631 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1632 SPP_ARGS(ifp), cp->name, 1633 h->ident, sp->confid[cp->protoidx]); 1634 ++ifp->if_ierrors; 1635 break; 1636 } 1637 if (h->type == CONF_NAK) 1638 (cp->RCN_nak)(sp, h, len); 1639 else /* CONF_REJ */ 1640 (cp->RCN_rej)(sp, h, len); 1641 1642 switch (sp->state[cp->protoidx]) { 1643 case STATE_CLOSED: 1644 case STATE_STOPPED: 1645 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1646 break; 1647 case STATE_REQ_SENT: 1648 case STATE_ACK_SENT: 1649 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1650 /* 1651 * Slow things down a bit if we think we might be 1652 * in loopback. Depend on the timeout to send the 1653 * next configuration request. 1654 */ 1655 if (sp->pp_loopcnt) 1656 break; 1657 (cp->scr)(sp); 1658 break; 1659 case STATE_OPENED: 1660 (cp->tld)(sp); 1661 /* fall through */ 1662 case STATE_ACK_RCVD: 1663 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1664 (cp->scr)(sp); 1665 break; 1666 case STATE_CLOSING: 1667 case STATE_STOPPING: 1668 break; 1669 default: 1670 kprintf(SPP_FMT "%s illegal %s in state %s\n", 1671 SPP_ARGS(ifp), cp->name, 1672 sppp_cp_type_name(h->type), 1673 sppp_state_name(sp->state[cp->protoidx])); 1674 ++ifp->if_ierrors; 1675 } 1676 break; 1677 1678 case TERM_REQ: 1679 switch (sp->state[cp->protoidx]) { 1680 case STATE_ACK_RCVD: 1681 case STATE_ACK_SENT: 1682 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1683 /* fall through */ 1684 case STATE_CLOSED: 1685 case STATE_STOPPED: 1686 case STATE_CLOSING: 1687 case STATE_STOPPING: 1688 case STATE_REQ_SENT: 1689 sta: 1690 /* Send Terminate-Ack packet. */ 1691 if (debug) 1692 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n", 1693 SPP_ARGS(ifp), cp->name); 1694 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1695 break; 1696 case STATE_OPENED: 1697 (cp->tld)(sp); 1698 sp->rst_counter[cp->protoidx] = 0; 1699 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1700 goto sta; 1701 break; 1702 default: 1703 kprintf(SPP_FMT "%s illegal %s in state %s\n", 1704 SPP_ARGS(ifp), cp->name, 1705 sppp_cp_type_name(h->type), 1706 sppp_state_name(sp->state[cp->protoidx])); 1707 ++ifp->if_ierrors; 1708 } 1709 break; 1710 case TERM_ACK: 1711 switch (sp->state[cp->protoidx]) { 1712 case STATE_CLOSED: 1713 case STATE_STOPPED: 1714 case STATE_REQ_SENT: 1715 case STATE_ACK_SENT: 1716 break; 1717 case STATE_CLOSING: 1718 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1719 (cp->tlf)(sp); 1720 break; 1721 case STATE_STOPPING: 1722 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1723 (cp->tlf)(sp); 1724 break; 1725 case STATE_ACK_RCVD: 1726 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1727 break; 1728 case STATE_OPENED: 1729 (cp->tld)(sp); 1730 (cp->scr)(sp); 1731 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1732 break; 1733 default: 1734 kprintf(SPP_FMT "%s illegal %s in state %s\n", 1735 SPP_ARGS(ifp), cp->name, 1736 sppp_cp_type_name(h->type), 1737 sppp_state_name(sp->state[cp->protoidx])); 1738 ++ifp->if_ierrors; 1739 } 1740 break; 1741 case CODE_REJ: 1742 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1743 log(LOG_INFO, 1744 SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, " 1745 "danger will robinson\n", 1746 SPP_ARGS(ifp), cp->name, 1747 sppp_cp_type_name(h->type), ntohs(*((u_short *)p))); 1748 switch (sp->state[cp->protoidx]) { 1749 case STATE_CLOSED: 1750 case STATE_STOPPED: 1751 case STATE_REQ_SENT: 1752 case STATE_ACK_SENT: 1753 case STATE_CLOSING: 1754 case STATE_STOPPING: 1755 case STATE_OPENED: 1756 break; 1757 case STATE_ACK_RCVD: 1758 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1759 break; 1760 default: 1761 kprintf(SPP_FMT "%s illegal %s in state %s\n", 1762 SPP_ARGS(ifp), cp->name, 1763 sppp_cp_type_name(h->type), 1764 sppp_state_name(sp->state[cp->protoidx])); 1765 ++ifp->if_ierrors; 1766 } 1767 break; 1768 case PROTO_REJ: 1769 { 1770 int catastrophic; 1771 const struct cp *upper; 1772 int i; 1773 u_int16_t proto; 1774 1775 catastrophic = 0; 1776 upper = NULL; 1777 proto = ntohs(*((u_int16_t *)p)); 1778 for (i = 0; i < IDX_COUNT; i++) { 1779 if (cps[i]->proto == proto) { 1780 upper = cps[i]; 1781 break; 1782 } 1783 } 1784 if (upper == NULL) 1785 catastrophic++; 1786 1787 if (catastrophic || debug) 1788 log(catastrophic? LOG_INFO: LOG_DEBUG, 1789 SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n", 1790 SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+', 1791 sppp_cp_type_name(h->type), proto, 1792 upper ? upper->name : "unknown", 1793 upper ? sppp_state_name(sp->state[upper->protoidx]) : "?"); 1794 1795 /* 1796 * if we got RXJ+ against conf-req, the peer does not implement 1797 * this particular protocol type. terminate the protocol. 1798 */ 1799 if (upper && !catastrophic) { 1800 if (sp->state[upper->protoidx] == STATE_REQ_SENT) { 1801 upper->Close(sp); 1802 break; 1803 } 1804 } 1805 1806 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1807 switch (sp->state[cp->protoidx]) { 1808 case STATE_CLOSED: 1809 case STATE_STOPPED: 1810 case STATE_REQ_SENT: 1811 case STATE_ACK_SENT: 1812 case STATE_CLOSING: 1813 case STATE_STOPPING: 1814 case STATE_OPENED: 1815 break; 1816 case STATE_ACK_RCVD: 1817 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1818 break; 1819 default: 1820 kprintf(SPP_FMT "%s illegal %s in state %s\n", 1821 SPP_ARGS(ifp), cp->name, 1822 sppp_cp_type_name(h->type), 1823 sppp_state_name(sp->state[cp->protoidx])); 1824 ++ifp->if_ierrors; 1825 } 1826 break; 1827 } 1828 case DISC_REQ: 1829 if (cp->proto != PPP_LCP) 1830 goto illegal; 1831 /* Discard the packet. */ 1832 break; 1833 case ECHO_REQ: 1834 if (cp->proto != PPP_LCP) 1835 goto illegal; 1836 if (sp->state[cp->protoidx] != STATE_OPENED) { 1837 if (debug) 1838 log(-1, SPP_FMT "lcp echo req but lcp closed\n", 1839 SPP_ARGS(ifp)); 1840 ++ifp->if_ierrors; 1841 break; 1842 } 1843 if (len < 8) { 1844 if (debug) 1845 log(-1, SPP_FMT "invalid lcp echo request " 1846 "packet length: %d bytes\n", 1847 SPP_ARGS(ifp), len); 1848 break; 1849 } 1850 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 1851 ntohl (*(long*)(h+1)) == sp->lcp.magic) { 1852 /* Line loopback mode detected. */ 1853 kprintf(SPP_FMT "loopback\n", SPP_ARGS(ifp)); 1854 sp->pp_loopcnt = MAXALIVECNT * 5; 1855 if_down (ifp); 1856 IF_DRAIN(&sp->pp_cpq); 1857 1858 /* Shut down the PPP link. */ 1859 /* XXX */ 1860 lcp.Down(sp); 1861 lcp.Up(sp); 1862 break; 1863 } 1864 *(long*)(h+1) = htonl (sp->lcp.magic); 1865 if (debug) 1866 log(-1, SPP_FMT "got lcp echo req, sending echo rep\n", 1867 SPP_ARGS(ifp)); 1868 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1); 1869 break; 1870 case ECHO_REPLY: 1871 if (cp->proto != PPP_LCP) 1872 goto illegal; 1873 if (h->ident != sp->lcp.echoid) { 1874 ++ifp->if_ierrors; 1875 break; 1876 } 1877 if (len < 8) { 1878 if (debug) 1879 log(-1, SPP_FMT "lcp invalid echo reply " 1880 "packet length: %d bytes\n", 1881 SPP_ARGS(ifp), len); 1882 break; 1883 } 1884 if (debug) 1885 log(-1, SPP_FMT "lcp got echo rep\n", 1886 SPP_ARGS(ifp)); 1887 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) || 1888 ntohl (*(long*)(h+1)) != sp->lcp.magic) 1889 sp->pp_alivecnt = 0; 1890 break; 1891 default: 1892 /* Unknown packet type -- send Code-Reject packet. */ 1893 illegal: 1894 if (debug) 1895 log(-1, SPP_FMT "%s send code-rej for 0x%x\n", 1896 SPP_ARGS(ifp), cp->name, h->type); 1897 sppp_cp_send(sp, cp->proto, CODE_REJ, 1898 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1899 ++ifp->if_ierrors; 1900 } 1901 } 1902 1903 1904 /* 1905 * The generic part of all Up/Down/Open/Close/TO event handlers. 1906 * Basically, the state transition handling in the automaton. 1907 */ 1908 static void 1909 sppp_up_event(const struct cp *cp, struct sppp *sp) 1910 { 1911 STDDCL; 1912 1913 if (debug) 1914 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n", 1915 SPP_ARGS(ifp), cp->name, 1916 sppp_state_name(sp->state[cp->protoidx])); 1917 1918 switch (sp->state[cp->protoidx]) { 1919 case STATE_INITIAL: 1920 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1921 break; 1922 case STATE_STARTING: 1923 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1924 (cp->scr)(sp); 1925 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1926 break; 1927 default: 1928 kprintf(SPP_FMT "%s illegal up in state %s\n", 1929 SPP_ARGS(ifp), cp->name, 1930 sppp_state_name(sp->state[cp->protoidx])); 1931 } 1932 } 1933 1934 static void 1935 sppp_down_event(const struct cp *cp, struct sppp *sp) 1936 { 1937 STDDCL; 1938 1939 if (debug) 1940 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n", 1941 SPP_ARGS(ifp), cp->name, 1942 sppp_state_name(sp->state[cp->protoidx])); 1943 1944 switch (sp->state[cp->protoidx]) { 1945 case STATE_CLOSED: 1946 case STATE_CLOSING: 1947 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1948 break; 1949 case STATE_STOPPED: 1950 sppp_cp_change_state(cp, sp, STATE_STARTING); 1951 (cp->tls)(sp); 1952 break; 1953 case STATE_STOPPING: 1954 case STATE_REQ_SENT: 1955 case STATE_ACK_RCVD: 1956 case STATE_ACK_SENT: 1957 sppp_cp_change_state(cp, sp, STATE_STARTING); 1958 break; 1959 case STATE_OPENED: 1960 (cp->tld)(sp); 1961 sppp_cp_change_state(cp, sp, STATE_STARTING); 1962 break; 1963 default: 1964 kprintf(SPP_FMT "%s illegal down in state %s\n", 1965 SPP_ARGS(ifp), cp->name, 1966 sppp_state_name(sp->state[cp->protoidx])); 1967 } 1968 } 1969 1970 1971 static void 1972 sppp_open_event(const struct cp *cp, struct sppp *sp) 1973 { 1974 STDDCL; 1975 1976 if (debug) 1977 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n", 1978 SPP_ARGS(ifp), cp->name, 1979 sppp_state_name(sp->state[cp->protoidx])); 1980 1981 switch (sp->state[cp->protoidx]) { 1982 case STATE_INITIAL: 1983 sppp_cp_change_state(cp, sp, STATE_STARTING); 1984 (cp->tls)(sp); 1985 break; 1986 case STATE_STARTING: 1987 break; 1988 case STATE_CLOSED: 1989 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1990 (cp->scr)(sp); 1991 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1992 break; 1993 case STATE_STOPPED: 1994 /* 1995 * Try escaping stopped state. This seems to bite 1996 * people occasionally, in particular for IPCP, 1997 * presumably following previous IPCP negotiation 1998 * aborts. Somehow, we must have missed a Down event 1999 * which would have caused a transition into starting 2000 * state, so as a bandaid we force the Down event now. 2001 * This effectively implements (something like the) 2002 * `restart' option mentioned in the state transition 2003 * table of RFC 1661. 2004 */ 2005 sppp_cp_change_state(cp, sp, STATE_STARTING); 2006 (cp->tls)(sp); 2007 break; 2008 case STATE_STOPPING: 2009 case STATE_REQ_SENT: 2010 case STATE_ACK_RCVD: 2011 case STATE_ACK_SENT: 2012 case STATE_OPENED: 2013 break; 2014 case STATE_CLOSING: 2015 sppp_cp_change_state(cp, sp, STATE_STOPPING); 2016 break; 2017 } 2018 } 2019 2020 2021 static void 2022 sppp_close_event(const struct cp *cp, struct sppp *sp) 2023 { 2024 STDDCL; 2025 2026 if (debug) 2027 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n", 2028 SPP_ARGS(ifp), cp->name, 2029 sppp_state_name(sp->state[cp->protoidx])); 2030 2031 switch (sp->state[cp->protoidx]) { 2032 case STATE_INITIAL: 2033 case STATE_CLOSED: 2034 case STATE_CLOSING: 2035 break; 2036 case STATE_STARTING: 2037 sppp_cp_change_state(cp, sp, STATE_INITIAL); 2038 (cp->tlf)(sp); 2039 break; 2040 case STATE_STOPPED: 2041 sppp_cp_change_state(cp, sp, STATE_CLOSED); 2042 break; 2043 case STATE_STOPPING: 2044 sppp_cp_change_state(cp, sp, STATE_CLOSING); 2045 break; 2046 case STATE_OPENED: 2047 (cp->tld)(sp); 2048 /* fall through */ 2049 case STATE_REQ_SENT: 2050 case STATE_ACK_RCVD: 2051 case STATE_ACK_SENT: 2052 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 2053 sppp_cp_send(sp, cp->proto, TERM_REQ, 2054 ++sp->pp_seq[cp->protoidx], 0, 0); 2055 sppp_cp_change_state(cp, sp, STATE_CLOSING); 2056 break; 2057 } 2058 } 2059 2060 static void 2061 sppp_to_event(const struct cp *cp, struct sppp *sp) 2062 { 2063 STDDCL; 2064 2065 crit_enter(); 2066 2067 if (debug) 2068 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n", 2069 SPP_ARGS(ifp), cp->name, 2070 sppp_state_name(sp->state[cp->protoidx]), 2071 sp->rst_counter[cp->protoidx]); 2072 2073 if (--sp->rst_counter[cp->protoidx] < 0) 2074 /* TO- event */ 2075 switch (sp->state[cp->protoidx]) { 2076 case STATE_CLOSING: 2077 sppp_cp_change_state(cp, sp, STATE_CLOSED); 2078 (cp->tlf)(sp); 2079 break; 2080 case STATE_STOPPING: 2081 sppp_cp_change_state(cp, sp, STATE_STOPPED); 2082 (cp->tlf)(sp); 2083 break; 2084 case STATE_REQ_SENT: 2085 case STATE_ACK_RCVD: 2086 case STATE_ACK_SENT: 2087 sppp_cp_change_state(cp, sp, STATE_STOPPED); 2088 (cp->tlf)(sp); 2089 break; 2090 } 2091 else 2092 /* TO+ event */ 2093 switch (sp->state[cp->protoidx]) { 2094 case STATE_CLOSING: 2095 case STATE_STOPPING: 2096 sppp_cp_send(sp, cp->proto, TERM_REQ, 2097 ++sp->pp_seq[cp->protoidx], 0, 0); 2098 callout_reset(&sp->timeout[cp->protoidx], 2099 sp->lcp.timeout, cp->TO, sp); 2100 break; 2101 case STATE_REQ_SENT: 2102 case STATE_ACK_RCVD: 2103 (cp->scr)(sp); 2104 /* sppp_cp_change_state() will restart the timer */ 2105 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 2106 break; 2107 case STATE_ACK_SENT: 2108 (cp->scr)(sp); 2109 callout_reset(&sp->timeout[cp->protoidx], 2110 sp->lcp.timeout, cp->TO, sp); 2111 break; 2112 } 2113 2114 crit_exit(); 2115 } 2116 2117 /* 2118 * Change the state of a control protocol in the state automaton. 2119 * Takes care of starting/stopping the restart timer. 2120 */ 2121 void 2122 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 2123 { 2124 sp->state[cp->protoidx] = newstate; 2125 callout_stop(&sp->timeout[cp->protoidx]); 2126 2127 switch (newstate) { 2128 case STATE_INITIAL: 2129 case STATE_STARTING: 2130 case STATE_CLOSED: 2131 case STATE_STOPPED: 2132 case STATE_OPENED: 2133 break; 2134 case STATE_CLOSING: 2135 case STATE_STOPPING: 2136 case STATE_REQ_SENT: 2137 case STATE_ACK_RCVD: 2138 case STATE_ACK_SENT: 2139 callout_reset(&sp->timeout[cp->protoidx], 2140 sp->lcp.timeout, cp->TO, sp); 2141 break; 2142 } 2143 } 2144 2145 /* 2146 *--------------------------------------------------------------------------* 2147 * * 2148 * The LCP implementation. * 2149 * * 2150 *--------------------------------------------------------------------------* 2151 */ 2152 static void 2153 sppp_lcp_init(struct sppp *sp) 2154 { 2155 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2156 sp->lcp.magic = 0; 2157 sp->state[IDX_LCP] = STATE_INITIAL; 2158 sp->fail_counter[IDX_LCP] = 0; 2159 sp->pp_seq[IDX_LCP] = 0; 2160 sp->pp_rseq[IDX_LCP] = 0; 2161 sp->lcp.protos = 0; 2162 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 2163 2164 /* Note that these values are relevant for all control protocols */ 2165 sp->lcp.timeout = 3 * hz; 2166 sp->lcp.max_terminate = 2; 2167 sp->lcp.max_configure = 10; 2168 sp->lcp.max_failure = 10; 2169 #if defined(__DragonFly__) 2170 callout_init(&sp->timeout[IDX_LCP]); 2171 #endif 2172 } 2173 2174 static void 2175 sppp_lcp_up(struct sppp *sp) 2176 { 2177 STDDCL; 2178 2179 sp->pp_alivecnt = 0; 2180 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 2181 sp->lcp.magic = 0; 2182 sp->lcp.protos = 0; 2183 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 2184 /* 2185 * If this interface is passive or dial-on-demand, and we are 2186 * still in Initial state, it means we've got an incoming 2187 * call. Activate the interface. 2188 */ 2189 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 2190 if (debug) 2191 log(LOG_DEBUG, 2192 SPP_FMT "Up event", SPP_ARGS(ifp)); 2193 ifp->if_flags |= IFF_RUNNING; 2194 if (sp->state[IDX_LCP] == STATE_INITIAL) { 2195 if (debug) 2196 log(-1, "(incoming call)\n"); 2197 sp->pp_flags |= PP_CALLIN; 2198 lcp.Open(sp); 2199 } else if (debug) 2200 log(-1, "\n"); 2201 } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 && 2202 (sp->state[IDX_LCP] == STATE_INITIAL)) { 2203 ifp->if_flags |= IFF_RUNNING; 2204 lcp.Open(sp); 2205 } 2206 2207 sppp_up_event(&lcp, sp); 2208 } 2209 2210 static void 2211 sppp_lcp_down(struct sppp *sp) 2212 { 2213 STDDCL; 2214 2215 sppp_down_event(&lcp, sp); 2216 2217 /* 2218 * If this is neither a dial-on-demand nor a passive 2219 * interface, simulate an ``ifconfig down'' action, so the 2220 * administrator can force a redial by another ``ifconfig 2221 * up''. XXX For leased line operation, should we immediately 2222 * try to reopen the connection here? 2223 */ 2224 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 2225 log(LOG_INFO, 2226 SPP_FMT "Down event, taking interface down.\n", 2227 SPP_ARGS(ifp)); 2228 if_down(ifp); 2229 } else { 2230 if (debug) 2231 log(LOG_DEBUG, 2232 SPP_FMT "Down event (carrier loss)\n", 2233 SPP_ARGS(ifp)); 2234 sp->pp_flags &= ~PP_CALLIN; 2235 if (sp->state[IDX_LCP] != STATE_INITIAL) 2236 lcp.Close(sp); 2237 ifp->if_flags &= ~IFF_RUNNING; 2238 } 2239 } 2240 2241 static void 2242 sppp_lcp_open(struct sppp *sp) 2243 { 2244 /* 2245 * If we are authenticator, negotiate LCP_AUTH 2246 */ 2247 if (sp->hisauth.proto != 0) 2248 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 2249 else 2250 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2251 sp->pp_flags &= ~PP_NEEDAUTH; 2252 sppp_open_event(&lcp, sp); 2253 } 2254 2255 static void 2256 sppp_lcp_close(struct sppp *sp) 2257 { 2258 sppp_close_event(&lcp, sp); 2259 } 2260 2261 static void 2262 sppp_lcp_TO(void *cookie) 2263 { 2264 sppp_to_event(&lcp, (struct sppp *)cookie); 2265 } 2266 2267 /* 2268 * Analyze a configure request. Return true if it was agreeable, and 2269 * caused action sca, false if it has been rejected or nak'ed, and 2270 * caused action scn. (The return value is used to make the state 2271 * transition decision in the state automaton.) 2272 */ 2273 static int 2274 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2275 { 2276 STDDCL; 2277 u_char *buf, *r, *p; 2278 int origlen, rlen; 2279 u_long nmagic; 2280 u_short authproto; 2281 2282 len -= 4; 2283 origlen = len; 2284 buf = r = kmalloc (len, M_TEMP, M_INTWAIT); 2285 2286 if (debug) 2287 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ", 2288 SPP_ARGS(ifp)); 2289 2290 /* pass 1: check for things that need to be rejected */ 2291 p = (void*) (h+1); 2292 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2293 /* Sanity check option length */ 2294 if (p[1] > len) { 2295 /* Malicious option - drop immediately. 2296 * XXX Maybe we should just RXJ it? 2297 */ 2298 log(-1, "%s: received malicious LCP option 0x%02x, " 2299 "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname, 2300 p[0], p[1], len); 2301 goto drop; 2302 } 2303 if (debug) 2304 log(-1, " %s ", sppp_lcp_opt_name(*p)); 2305 switch (*p) { 2306 case LCP_OPT_MAGIC: 2307 /* Magic number. */ 2308 if (len >= 6 && p[1] == 6) 2309 continue; 2310 if (debug) 2311 log(-1, "[invalid] "); 2312 break; 2313 case LCP_OPT_ASYNC_MAP: 2314 /* Async control character map. */ 2315 if (len >= 6 && p[1] == 6) 2316 continue; 2317 if (debug) 2318 log(-1, "[invalid] "); 2319 break; 2320 case LCP_OPT_MRU: 2321 /* Maximum receive unit. */ 2322 if (len >= 4 && p[1] == 4) 2323 continue; 2324 if (debug) 2325 log(-1, "[invalid] "); 2326 break; 2327 case LCP_OPT_AUTH_PROTO: 2328 if (len < 4) { 2329 if (debug) 2330 log(-1, "[invalid] "); 2331 break; 2332 } 2333 authproto = (p[2] << 8) + p[3]; 2334 if (authproto == PPP_CHAP && p[1] != 5) { 2335 if (debug) 2336 log(-1, "[invalid chap len] "); 2337 break; 2338 } 2339 if (sp->myauth.proto == 0) { 2340 /* we are not configured to do auth */ 2341 if (debug) 2342 log(-1, "[not configured] "); 2343 break; 2344 } 2345 /* 2346 * Remote want us to authenticate, remember this, 2347 * so we stay in PHASE_AUTHENTICATE after LCP got 2348 * up. 2349 */ 2350 sp->pp_flags |= PP_NEEDAUTH; 2351 continue; 2352 default: 2353 /* Others not supported. */ 2354 if (debug) 2355 log(-1, "[rej] "); 2356 break; 2357 } 2358 /* Add the option to rejected list. */ 2359 bcopy (p, r, p[1]); 2360 r += p[1]; 2361 rlen += p[1]; 2362 } 2363 if (rlen) { 2364 if (debug) 2365 log(-1, " send conf-rej\n"); 2366 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2367 return 0; 2368 } else if (debug) 2369 log(-1, "\n"); 2370 2371 /* 2372 * pass 2: check for option values that are unacceptable and 2373 * thus require to be nak'ed. 2374 */ 2375 if (debug) 2376 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ", 2377 SPP_ARGS(ifp)); 2378 2379 p = (void*) (h+1); 2380 len = origlen; 2381 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2382 if (debug) 2383 log(-1, " %s ", sppp_lcp_opt_name(*p)); 2384 switch (*p) { 2385 case LCP_OPT_MAGIC: 2386 /* Magic number -- extract. */ 2387 nmagic = (u_long)p[2] << 24 | 2388 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 2389 if (nmagic != sp->lcp.magic) { 2390 sp->pp_loopcnt = 0; 2391 if (debug) 2392 log(-1, "0x%lx ", nmagic); 2393 continue; 2394 } 2395 if (debug && sp->pp_loopcnt < MAXALIVECNT*5) 2396 log(-1, "[glitch] "); 2397 ++sp->pp_loopcnt; 2398 /* 2399 * We negate our magic here, and NAK it. If 2400 * we see it later in an NAK packet, we 2401 * suggest a new one. 2402 */ 2403 nmagic = ~sp->lcp.magic; 2404 /* Gonna NAK it. */ 2405 p[2] = nmagic >> 24; 2406 p[3] = nmagic >> 16; 2407 p[4] = nmagic >> 8; 2408 p[5] = nmagic; 2409 break; 2410 2411 case LCP_OPT_ASYNC_MAP: 2412 /* 2413 * Async control character map -- just ignore it. 2414 * 2415 * Quote from RFC 1662, chapter 6: 2416 * To enable this functionality, synchronous PPP 2417 * implementations MUST always respond to the 2418 * Async-Control-Character-Map Configuration 2419 * Option with the LCP Configure-Ack. However, 2420 * acceptance of the Configuration Option does 2421 * not imply that the synchronous implementation 2422 * will do any ACCM mapping. Instead, all such 2423 * octet mapping will be performed by the 2424 * asynchronous-to-synchronous converter. 2425 */ 2426 continue; 2427 2428 case LCP_OPT_MRU: 2429 /* 2430 * Maximum receive unit. Always agreeable, 2431 * but ignored by now. 2432 */ 2433 sp->lcp.their_mru = p[2] * 256 + p[3]; 2434 if (debug) 2435 log(-1, "%lu ", sp->lcp.their_mru); 2436 continue; 2437 2438 case LCP_OPT_AUTH_PROTO: 2439 authproto = (p[2] << 8) + p[3]; 2440 if (sp->myauth.proto != authproto) { 2441 /* not agreed, nak */ 2442 if (debug) 2443 log(-1, "[mine %s != his %s] ", 2444 sppp_proto_name(sp->hisauth.proto), 2445 sppp_proto_name(authproto)); 2446 p[2] = sp->myauth.proto >> 8; 2447 p[3] = sp->myauth.proto; 2448 break; 2449 } 2450 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2451 if (debug) 2452 log(-1, "[chap not MD5] "); 2453 p[4] = CHAP_MD5; 2454 break; 2455 } 2456 continue; 2457 } 2458 /* Add the option to nak'ed list. */ 2459 bcopy (p, r, p[1]); 2460 r += p[1]; 2461 rlen += p[1]; 2462 } 2463 if (rlen) { 2464 /* 2465 * Local and remote magics equal -- loopback? 2466 */ 2467 if (sp->pp_loopcnt >= MAXALIVECNT*5) { 2468 if (sp->pp_loopcnt == MAXALIVECNT*5) 2469 kprintf (SPP_FMT "loopback\n", 2470 SPP_ARGS(ifp)); 2471 if (ifp->if_flags & IFF_UP) { 2472 if_down(ifp); 2473 IF_DRAIN(&sp->pp_cpq); 2474 /* XXX ? */ 2475 lcp.Down(sp); 2476 lcp.Up(sp); 2477 } 2478 } else if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2479 if (debug) 2480 log(-1, " max_failure (%d) exceeded, " 2481 "send conf-rej\n", 2482 sp->lcp.max_failure); 2483 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2484 } else { 2485 if (debug) 2486 log(-1, " send conf-nak\n"); 2487 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2488 } 2489 } else { 2490 if (debug) 2491 log(-1, " send conf-ack\n"); 2492 sp->fail_counter[IDX_LCP] = 0; 2493 sp->pp_loopcnt = 0; 2494 sppp_cp_send (sp, PPP_LCP, CONF_ACK, 2495 h->ident, origlen, h+1); 2496 } 2497 2498 kfree (buf, M_TEMP); 2499 return (rlen == 0); 2500 2501 drop: 2502 kfree(buf, M_TEMP); 2503 return (-1); 2504 } 2505 2506 /* 2507 * Analyze the LCP Configure-Reject option list, and adjust our 2508 * negotiation. 2509 */ 2510 static void 2511 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2512 { 2513 STDDCL; 2514 u_char *buf, *p; 2515 2516 len -= 4; 2517 buf = kmalloc (len, M_TEMP, M_INTWAIT); 2518 2519 if (debug) 2520 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ", 2521 SPP_ARGS(ifp)); 2522 2523 p = (void*) (h+1); 2524 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2525 /* Sanity check option length */ 2526 if (p[1] > len) { 2527 /* 2528 * Malicious option - drop immediately. 2529 * XXX Maybe we should just RXJ it? 2530 */ 2531 log(-1, "%s: received malicious LCP option, " 2532 "dropping.\n", ifp->if_xname); 2533 goto drop; 2534 } 2535 if (debug) 2536 log(-1, " %s ", sppp_lcp_opt_name(*p)); 2537 switch (*p) { 2538 case LCP_OPT_MAGIC: 2539 /* Magic number -- can't use it, use 0 */ 2540 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2541 sp->lcp.magic = 0; 2542 break; 2543 case LCP_OPT_MRU: 2544 /* 2545 * Should not be rejected anyway, since we only 2546 * negotiate a MRU if explicitly requested by 2547 * peer. 2548 */ 2549 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2550 break; 2551 case LCP_OPT_AUTH_PROTO: 2552 /* 2553 * Peer doesn't want to authenticate himself, 2554 * deny unless this is a dialout call, and 2555 * AUTHFLAG_NOCALLOUT is set. 2556 */ 2557 if ((sp->pp_flags & PP_CALLIN) == 0 && 2558 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) { 2559 if (debug) 2560 log(-1, "[don't insist on auth " 2561 "for callout]"); 2562 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2563 break; 2564 } 2565 if (debug) 2566 log(-1, "[access denied]\n"); 2567 lcp.Close(sp); 2568 break; 2569 } 2570 } 2571 if (debug) 2572 log(-1, "\n"); 2573 drop: 2574 kfree (buf, M_TEMP); 2575 return; 2576 } 2577 2578 /* 2579 * Analyze the LCP Configure-NAK option list, and adjust our 2580 * negotiation. 2581 */ 2582 static void 2583 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2584 { 2585 STDDCL; 2586 u_char *buf, *p; 2587 u_long magic; 2588 2589 len -= 4; 2590 buf = kmalloc (len, M_TEMP, M_INTWAIT); 2591 2592 if (debug) 2593 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ", 2594 SPP_ARGS(ifp)); 2595 2596 p = (void*) (h+1); 2597 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2598 /* Sanity check option length */ 2599 if (p[1] > len) { 2600 /* 2601 * Malicious option - drop immediately. 2602 * XXX Maybe we should just RXJ it? 2603 */ 2604 log(-1, "%s: received malicious LCP option, " 2605 "dropping.\n", ifp->if_xname); 2606 goto drop; 2607 } 2608 if (debug) 2609 log(-1, " %s ", sppp_lcp_opt_name(*p)); 2610 switch (*p) { 2611 case LCP_OPT_MAGIC: 2612 /* Magic number -- renegotiate */ 2613 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2614 len >= 6 && p[1] == 6) { 2615 magic = (u_long)p[2] << 24 | 2616 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 2617 /* 2618 * If the remote magic is our negated one, 2619 * this looks like a loopback problem. 2620 * Suggest a new magic to make sure. 2621 */ 2622 if (magic == ~sp->lcp.magic) { 2623 if (debug) 2624 log(-1, "magic glitch "); 2625 #if defined(__DragonFly__) 2626 sp->lcp.magic = krandom(); 2627 #else 2628 sp->lcp.magic = time.tv_sec + time.tv_usec; 2629 #endif 2630 } else { 2631 sp->lcp.magic = magic; 2632 if (debug) 2633 log(-1, "%lu ", magic); 2634 } 2635 } 2636 break; 2637 case LCP_OPT_MRU: 2638 /* 2639 * Peer wants to advise us to negotiate an MRU. 2640 * Agree on it if it's reasonable, or use 2641 * default otherwise. 2642 */ 2643 if (len >= 4 && p[1] == 4) { 2644 u_int mru = p[2] * 256 + p[3]; 2645 if (debug) 2646 log(-1, "%d ", mru); 2647 if (mru < PP_MTU || mru > PP_MAX_MRU) 2648 mru = PP_MTU; 2649 sp->lcp.mru = mru; 2650 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2651 } 2652 break; 2653 case LCP_OPT_AUTH_PROTO: 2654 /* 2655 * Peer doesn't like our authentication method, 2656 * deny. 2657 */ 2658 if (debug) 2659 log(-1, "[access denied]\n"); 2660 lcp.Close(sp); 2661 break; 2662 } 2663 } 2664 if (debug) 2665 log(-1, "\n"); 2666 drop: 2667 kfree (buf, M_TEMP); 2668 return; 2669 } 2670 2671 static void 2672 sppp_lcp_tlu(struct sppp *sp) 2673 { 2674 STDDCL; 2675 int i; 2676 u_long mask; 2677 2678 /* XXX ? */ 2679 if (! (ifp->if_flags & IFF_UP) && 2680 (ifp->if_flags & IFF_RUNNING)) { 2681 /* Coming out of loopback mode. */ 2682 if_up(ifp); 2683 kprintf (SPP_FMT "up\n", SPP_ARGS(ifp)); 2684 } 2685 2686 for (i = 0; i < IDX_COUNT; i++) 2687 if ((cps[i])->flags & CP_QUAL) 2688 (cps[i])->Open(sp); 2689 2690 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2691 (sp->pp_flags & PP_NEEDAUTH) != 0) 2692 sp->pp_phase = PHASE_AUTHENTICATE; 2693 else 2694 sp->pp_phase = PHASE_NETWORK; 2695 2696 if (debug) 2697 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2698 sppp_phase_name(sp->pp_phase)); 2699 2700 /* 2701 * Open all authentication protocols. This is even required 2702 * if we already proceeded to network phase, since it might be 2703 * that remote wants us to authenticate, so we might have to 2704 * send a PAP request. Undesired authentication protocols 2705 * don't do anything when they get an Open event. 2706 */ 2707 for (i = 0; i < IDX_COUNT; i++) 2708 if ((cps[i])->flags & CP_AUTH) 2709 (cps[i])->Open(sp); 2710 2711 if (sp->pp_phase == PHASE_NETWORK) { 2712 /* Notify all NCPs. */ 2713 for (i = 0; i < IDX_COUNT; i++) 2714 if (((cps[i])->flags & CP_NCP) && 2715 /* 2716 * XXX 2717 * Hack to administratively disable IPv6 if 2718 * not desired. Perhaps we should have another 2719 * flag for this, but right now, we can make 2720 * all struct cp's read/only. 2721 */ 2722 (cps[i] != &ipv6cp || 2723 (sp->confflags & CONF_ENABLE_IPV6))) 2724 (cps[i])->Open(sp); 2725 } 2726 2727 /* Send Up events to all started protos. */ 2728 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2729 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) 2730 (cps[i])->Up(sp); 2731 2732 /* notify low-level driver of state change */ 2733 if (sp->pp_chg) 2734 sp->pp_chg(sp, (int)sp->pp_phase); 2735 2736 if (sp->pp_phase == PHASE_NETWORK) 2737 /* if no NCP is starting, close down */ 2738 sppp_lcp_check_and_close(sp); 2739 } 2740 2741 static void 2742 sppp_lcp_tld(struct sppp *sp) 2743 { 2744 STDDCL; 2745 int i; 2746 u_long mask; 2747 2748 sp->pp_phase = PHASE_TERMINATE; 2749 2750 if (debug) 2751 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2752 sppp_phase_name(sp->pp_phase)); 2753 2754 /* 2755 * Take upper layers down. We send the Down event first and 2756 * the Close second to prevent the upper layers from sending 2757 * ``a flurry of terminate-request packets'', as the RFC 2758 * describes it. 2759 */ 2760 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2761 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) { 2762 (cps[i])->Down(sp); 2763 (cps[i])->Close(sp); 2764 } 2765 } 2766 2767 static void 2768 sppp_lcp_tls(struct sppp *sp) 2769 { 2770 STDDCL; 2771 2772 sp->pp_phase = PHASE_ESTABLISH; 2773 2774 if (debug) 2775 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2776 sppp_phase_name(sp->pp_phase)); 2777 2778 /* Notify lower layer if desired. */ 2779 if (sp->pp_tls) 2780 (sp->pp_tls)(sp); 2781 else 2782 (sp->pp_up)(sp); 2783 } 2784 2785 static void 2786 sppp_lcp_tlf(struct sppp *sp) 2787 { 2788 STDDCL; 2789 2790 sp->pp_phase = PHASE_DEAD; 2791 if (debug) 2792 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2793 sppp_phase_name(sp->pp_phase)); 2794 2795 /* Notify lower layer if desired. */ 2796 if (sp->pp_tlf) 2797 (sp->pp_tlf)(sp); 2798 else 2799 (sp->pp_down)(sp); 2800 } 2801 2802 static void 2803 sppp_lcp_scr(struct sppp *sp) 2804 { 2805 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2806 int i = 0; 2807 u_short authproto; 2808 2809 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2810 if (! sp->lcp.magic) 2811 #if defined(__DragonFly__) 2812 sp->lcp.magic = krandom(); 2813 #else 2814 sp->lcp.magic = time.tv_sec + time.tv_usec; 2815 #endif 2816 opt[i++] = LCP_OPT_MAGIC; 2817 opt[i++] = 6; 2818 opt[i++] = sp->lcp.magic >> 24; 2819 opt[i++] = sp->lcp.magic >> 16; 2820 opt[i++] = sp->lcp.magic >> 8; 2821 opt[i++] = sp->lcp.magic; 2822 } 2823 2824 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2825 opt[i++] = LCP_OPT_MRU; 2826 opt[i++] = 4; 2827 opt[i++] = sp->lcp.mru >> 8; 2828 opt[i++] = sp->lcp.mru; 2829 } 2830 2831 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2832 authproto = sp->hisauth.proto; 2833 opt[i++] = LCP_OPT_AUTH_PROTO; 2834 opt[i++] = authproto == PPP_CHAP? 5: 4; 2835 opt[i++] = authproto >> 8; 2836 opt[i++] = authproto; 2837 if (authproto == PPP_CHAP) 2838 opt[i++] = CHAP_MD5; 2839 } 2840 2841 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2842 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2843 } 2844 2845 /* 2846 * Check the open NCPs, return true if at least one NCP is open. 2847 */ 2848 static int 2849 sppp_ncp_check(struct sppp *sp) 2850 { 2851 int i, mask; 2852 2853 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2854 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP) 2855 return 1; 2856 return 0; 2857 } 2858 2859 /* 2860 * Re-check the open NCPs and see if we should terminate the link. 2861 * Called by the NCPs during their tlf action handling. 2862 */ 2863 static void 2864 sppp_lcp_check_and_close(struct sppp *sp) 2865 { 2866 2867 if (sp->pp_phase < PHASE_NETWORK) 2868 /* don't bother, we are already going down */ 2869 return; 2870 2871 if (sppp_ncp_check(sp)) 2872 return; 2873 2874 lcp.Close(sp); 2875 } 2876 2877 /* 2878 *--------------------------------------------------------------------------* 2879 * * 2880 * The IPCP implementation. * 2881 * * 2882 *--------------------------------------------------------------------------* 2883 */ 2884 2885 static void 2886 sppp_ipcp_init(struct sppp *sp) 2887 { 2888 sp->ipcp.opts = 0; 2889 sp->ipcp.flags = 0; 2890 sp->state[IDX_IPCP] = STATE_INITIAL; 2891 sp->fail_counter[IDX_IPCP] = 0; 2892 sp->pp_seq[IDX_IPCP] = 0; 2893 sp->pp_rseq[IDX_IPCP] = 0; 2894 #if defined(__DragonFly__) 2895 callout_init(&sp->timeout[IDX_IPCP]); 2896 #endif 2897 } 2898 2899 static void 2900 sppp_ipcp_up(struct sppp *sp) 2901 { 2902 sppp_up_event(&ipcp, sp); 2903 } 2904 2905 static void 2906 sppp_ipcp_down(struct sppp *sp) 2907 { 2908 sppp_down_event(&ipcp, sp); 2909 } 2910 2911 static void 2912 sppp_ipcp_open(struct sppp *sp) 2913 { 2914 STDDCL; 2915 u_long myaddr, hisaddr; 2916 2917 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN | 2918 IPCP_MYADDR_DYN | IPCP_VJ); 2919 sp->ipcp.opts = 0; 2920 2921 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2922 /* 2923 * If we don't have his address, this probably means our 2924 * interface doesn't want to talk IP at all. (This could 2925 * be the case if somebody wants to speak only IPX, for 2926 * example.) Don't open IPCP in this case. 2927 */ 2928 if (hisaddr == 0L) { 2929 /* XXX this message should go away */ 2930 if (debug) 2931 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n", 2932 SPP_ARGS(ifp)); 2933 return; 2934 } 2935 if (myaddr == 0L) { 2936 /* 2937 * I don't have an assigned address, so i need to 2938 * negotiate my address. 2939 */ 2940 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2941 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2942 } else 2943 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 2944 if (sp->confflags & CONF_ENABLE_VJ) { 2945 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION); 2946 sp->ipcp.max_state = MAX_STATES - 1; 2947 sp->ipcp.compress_cid = 1; 2948 } 2949 sppp_open_event(&ipcp, sp); 2950 } 2951 2952 static void 2953 sppp_ipcp_close(struct sppp *sp) 2954 { 2955 sppp_close_event(&ipcp, sp); 2956 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 2957 /* 2958 * My address was dynamic, clear it again. 2959 */ 2960 sppp_set_ip_addr(sp, 0L); 2961 } 2962 2963 static void 2964 sppp_ipcp_TO(void *cookie) 2965 { 2966 sppp_to_event(&ipcp, (struct sppp *)cookie); 2967 } 2968 2969 /* 2970 * Analyze a configure request. Return true if it was agreeable, and 2971 * caused action sca, false if it has been rejected or nak'ed, and 2972 * caused action scn. (The return value is used to make the state 2973 * transition decision in the state automaton.) 2974 */ 2975 static int 2976 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2977 { 2978 u_char *buf, *r, *p; 2979 struct ifnet *ifp = &sp->pp_if; 2980 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2981 u_long hisaddr, desiredaddr; 2982 int gotmyaddr = 0; 2983 int desiredcomp; 2984 2985 len -= 4; 2986 origlen = len; 2987 /* 2988 * Make sure to allocate a buf that can at least hold a 2989 * conf-nak with an `address' option. We might need it below. 2990 */ 2991 buf = r = kmalloc ((len < 6? 6: len), M_TEMP, M_INTWAIT); 2992 2993 /* pass 1: see if we can recognize them */ 2994 if (debug) 2995 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ", 2996 SPP_ARGS(ifp)); 2997 p = (void*) (h+1); 2998 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2999 /* Sanity check option length */ 3000 if (p[1] > len) { 3001 /* XXX should we just RXJ? */ 3002 log(-1, "%s: malicious IPCP option received, dropping\n", 3003 ifp->if_xname); 3004 goto drop; 3005 } 3006 if (debug) 3007 log(-1, " %s ", sppp_ipcp_opt_name(*p)); 3008 switch (*p) { 3009 case IPCP_OPT_COMPRESSION: 3010 if (!(sp->confflags & CONF_ENABLE_VJ)) { 3011 /* VJ compression administratively disabled */ 3012 if (debug) 3013 log(-1, "[locally disabled] "); 3014 break; 3015 } 3016 /* 3017 * In theory, we should only conf-rej an 3018 * option that is shorter than RFC 1618 3019 * requires (i.e. < 4), and should conf-nak 3020 * anything else that is not VJ. However, 3021 * since our algorithm always uses the 3022 * original option to NAK it with new values, 3023 * things would become more complicated. In 3024 * pratice, the only commonly implemented IP 3025 * compression option is VJ anyway, so the 3026 * difference is negligible. 3027 */ 3028 if (len >= 6 && p[1] == 6) { 3029 /* 3030 * correctly formed compression option 3031 * that could be VJ compression 3032 */ 3033 continue; 3034 } 3035 if (debug) 3036 log(-1, "optlen %d [invalid/unsupported] ", 3037 p[1]); 3038 break; 3039 case IPCP_OPT_ADDRESS: 3040 if (len >= 6 && p[1] == 6) { 3041 /* correctly formed address option */ 3042 continue; 3043 } 3044 if (debug) 3045 log(-1, "[invalid] "); 3046 break; 3047 default: 3048 /* Others not supported. */ 3049 if (debug) 3050 log(-1, "[rej] "); 3051 break; 3052 } 3053 /* Add the option to rejected list. */ 3054 bcopy (p, r, p[1]); 3055 r += p[1]; 3056 rlen += p[1]; 3057 } 3058 if (rlen) { 3059 if (debug) 3060 log(-1, " send conf-rej\n"); 3061 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 3062 return 0; 3063 } else if (debug) 3064 log(-1, "\n"); 3065 3066 /* pass 2: parse option values */ 3067 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); 3068 if (debug) 3069 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ", 3070 SPP_ARGS(ifp)); 3071 p = (void*) (h+1); 3072 len = origlen; 3073 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3074 if (debug) 3075 log(-1, " %s ", sppp_ipcp_opt_name(*p)); 3076 switch (*p) { 3077 case IPCP_OPT_COMPRESSION: 3078 desiredcomp = p[2] << 8 | p[3]; 3079 /* We only support VJ */ 3080 if (desiredcomp == IPCP_COMP_VJ) { 3081 if (debug) 3082 log(-1, "VJ [ack] "); 3083 sp->ipcp.flags |= IPCP_VJ; 3084 sl_compress_init(sp->pp_comp, p[4]); 3085 sp->ipcp.max_state = p[4]; 3086 sp->ipcp.compress_cid = p[5]; 3087 continue; 3088 } 3089 if (debug) 3090 log(-1, "compproto %#04x [not supported] ", 3091 desiredcomp); 3092 p[2] = IPCP_COMP_VJ >> 8; 3093 p[3] = IPCP_COMP_VJ; 3094 p[4] = sp->ipcp.max_state; 3095 p[5] = sp->ipcp.compress_cid; 3096 break; 3097 case IPCP_OPT_ADDRESS: 3098 /* This is the address he wants in his end */ 3099 desiredaddr = p[2] << 24 | p[3] << 16 | 3100 p[4] << 8 | p[5]; 3101 if (desiredaddr == hisaddr || 3102 (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) { 3103 /* 3104 * Peer's address is same as our value, 3105 * or we have set it to 0.0.0.* to 3106 * indicate that we do not really care, 3107 * this is agreeable. Gonna conf-ack 3108 * it. 3109 */ 3110 if (debug) 3111 log(-1, "%s [ack] ", 3112 sppp_dotted_quad(hisaddr)); 3113 /* record that we've seen it already */ 3114 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 3115 continue; 3116 } 3117 /* 3118 * The address wasn't agreeable. This is either 3119 * he sent us 0.0.0.0, asking to assign him an 3120 * address, or he send us another address not 3121 * matching our value. Either case, we gonna 3122 * conf-nak it with our value. 3123 * XXX: we should "rej" if hisaddr == 0 3124 */ 3125 if (debug) { 3126 if (desiredaddr == 0) 3127 log(-1, "[addr requested] "); 3128 else 3129 log(-1, "%s [not agreed] ", 3130 sppp_dotted_quad(desiredaddr)); 3131 3132 } 3133 p[2] = hisaddr >> 24; 3134 p[3] = hisaddr >> 16; 3135 p[4] = hisaddr >> 8; 3136 p[5] = hisaddr; 3137 break; 3138 } 3139 /* Add the option to nak'ed list. */ 3140 bcopy (p, r, p[1]); 3141 r += p[1]; 3142 rlen += p[1]; 3143 } 3144 3145 /* 3146 * If we are about to conf-ack the request, but haven't seen 3147 * his address so far, gonna conf-nak it instead, with the 3148 * `address' option present and our idea of his address being 3149 * filled in there, to request negotiation of both addresses. 3150 * 3151 * XXX This can result in an endless req - nak loop if peer 3152 * doesn't want to send us his address. Q: What should we do 3153 * about it? XXX A: implement the max-failure counter. 3154 */ 3155 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) { 3156 buf[0] = IPCP_OPT_ADDRESS; 3157 buf[1] = 6; 3158 buf[2] = hisaddr >> 24; 3159 buf[3] = hisaddr >> 16; 3160 buf[4] = hisaddr >> 8; 3161 buf[5] = hisaddr; 3162 rlen = 6; 3163 if (debug) 3164 log(-1, "still need hisaddr "); 3165 } 3166 3167 if (rlen) { 3168 if (debug) 3169 log(-1, " send conf-nak\n"); 3170 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 3171 } else { 3172 if (debug) 3173 log(-1, " send conf-ack\n"); 3174 sppp_cp_send (sp, PPP_IPCP, CONF_ACK, 3175 h->ident, origlen, h+1); 3176 } 3177 3178 kfree (buf, M_TEMP); 3179 return (rlen == 0); 3180 3181 drop: 3182 kfree(buf, M_TEMP); 3183 return (-1); 3184 } 3185 3186 /* 3187 * Analyze the IPCP Configure-Reject option list, and adjust our 3188 * negotiation. 3189 */ 3190 static void 3191 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3192 { 3193 u_char *buf, *p; 3194 struct ifnet *ifp = &sp->pp_if; 3195 int debug = ifp->if_flags & IFF_DEBUG; 3196 3197 len -= 4; 3198 buf = kmalloc (len, M_TEMP, M_INTWAIT); 3199 3200 if (debug) 3201 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ", 3202 SPP_ARGS(ifp)); 3203 3204 p = (void*) (h+1); 3205 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3206 /* Sanity check option length */ 3207 if (p[1] > len) { 3208 /* XXX should we just RXJ? */ 3209 log(-1, "%s: malicious IPCP option received, dropping\n", 3210 ifp->if_xname); 3211 goto drop; 3212 } 3213 if (debug) 3214 log(-1, " %s ", sppp_ipcp_opt_name(*p)); 3215 switch (*p) { 3216 case IPCP_OPT_COMPRESSION: 3217 sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION); 3218 break; 3219 case IPCP_OPT_ADDRESS: 3220 /* 3221 * Peer doesn't grok address option. This is 3222 * bad. XXX Should we better give up here? 3223 * XXX We could try old "addresses" option... 3224 */ 3225 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 3226 break; 3227 } 3228 } 3229 if (debug) 3230 log(-1, "\n"); 3231 drop: 3232 kfree (buf, M_TEMP); 3233 return; 3234 } 3235 3236 /* 3237 * Analyze the IPCP Configure-NAK option list, and adjust our 3238 * negotiation. 3239 */ 3240 static void 3241 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3242 { 3243 u_char *buf, *p; 3244 struct ifnet *ifp = &sp->pp_if; 3245 int debug = ifp->if_flags & IFF_DEBUG; 3246 int desiredcomp; 3247 u_long wantaddr; 3248 3249 len -= 4; 3250 buf = kmalloc (len, M_TEMP, M_INTWAIT); 3251 3252 if (debug) 3253 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ", 3254 SPP_ARGS(ifp)); 3255 3256 p = (void*) (h+1); 3257 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3258 /* Sanity check option length */ 3259 if (p[1] > len) { 3260 /* XXX should we just RXJ? */ 3261 log(-1, "%s: malicious IPCP option received, dropping\n", 3262 ifp->if_xname); 3263 return; 3264 } 3265 if (debug) 3266 log(-1, " %s ", sppp_ipcp_opt_name(*p)); 3267 switch (*p) { 3268 case IPCP_OPT_COMPRESSION: 3269 if (len >= 6 && p[1] == 6) { 3270 desiredcomp = p[2] << 8 | p[3]; 3271 if (debug) 3272 log(-1, "[wantcomp %#04x] ", 3273 desiredcomp); 3274 if (desiredcomp == IPCP_COMP_VJ) { 3275 sl_compress_init(sp->pp_comp, p[4]); 3276 sp->ipcp.max_state = p[4]; 3277 sp->ipcp.compress_cid = p[5]; 3278 if (debug) 3279 log(-1, "[agree] "); 3280 } else 3281 sp->ipcp.opts &= 3282 ~(1 << IPCP_OPT_COMPRESSION); 3283 } 3284 break; 3285 case IPCP_OPT_ADDRESS: 3286 /* 3287 * Peer doesn't like our local IP address. See 3288 * if we can do something for him. We'll drop 3289 * him our address then. 3290 */ 3291 if (len >= 6 && p[1] == 6) { 3292 wantaddr = p[2] << 24 | p[3] << 16 | 3293 p[4] << 8 | p[5]; 3294 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 3295 if (debug) 3296 log(-1, "[wantaddr %s] ", 3297 sppp_dotted_quad(wantaddr)); 3298 /* 3299 * When doing dynamic address assignment, 3300 * we accept his offer. Otherwise, we 3301 * ignore it and thus continue to negotiate 3302 * our already existing value. 3303 * XXX: Bogus, if he said no once, he'll 3304 * just say no again, might as well die. 3305 */ 3306 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 3307 sppp_set_ip_addr(sp, wantaddr); 3308 if (debug) 3309 log(-1, "[agree] "); 3310 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 3311 } 3312 } 3313 break; 3314 } 3315 } 3316 if (debug) 3317 log(-1, "\n"); 3318 kfree (buf, M_TEMP); 3319 return; 3320 } 3321 3322 static void 3323 sppp_ipcp_tlu(struct sppp *sp) 3324 { 3325 /* we are up - notify isdn daemon */ 3326 if (sp->pp_con) 3327 sp->pp_con(sp); 3328 } 3329 3330 static void 3331 sppp_ipcp_tld(struct sppp *sp) 3332 { 3333 } 3334 3335 static void 3336 sppp_ipcp_tls(struct sppp *sp) 3337 { 3338 /* indicate to LCP that it must stay alive */ 3339 sp->lcp.protos |= (1 << IDX_IPCP); 3340 } 3341 3342 static void 3343 sppp_ipcp_tlf(struct sppp *sp) 3344 { 3345 /* we no longer need LCP */ 3346 sp->lcp.protos &= ~(1 << IDX_IPCP); 3347 sppp_lcp_check_and_close(sp); 3348 } 3349 3350 static void 3351 sppp_ipcp_scr(struct sppp *sp) 3352 { 3353 char opt[6 /* compression */ + 6 /* address */]; 3354 u_long ouraddr; 3355 int i = 0; 3356 3357 if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) { 3358 opt[i++] = IPCP_OPT_COMPRESSION; 3359 opt[i++] = 6; 3360 opt[i++] = IPCP_COMP_VJ >> 8; 3361 opt[i++] = IPCP_COMP_VJ; 3362 opt[i++] = sp->ipcp.max_state; 3363 opt[i++] = sp->ipcp.compress_cid; 3364 } 3365 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 3366 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 3367 opt[i++] = IPCP_OPT_ADDRESS; 3368 opt[i++] = 6; 3369 opt[i++] = ouraddr >> 24; 3370 opt[i++] = ouraddr >> 16; 3371 opt[i++] = ouraddr >> 8; 3372 opt[i++] = ouraddr; 3373 } 3374 3375 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 3376 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 3377 } 3378 3379 /* 3380 *--------------------------------------------------------------------------* 3381 * * 3382 * The IPv6CP implementation. * 3383 * * 3384 *--------------------------------------------------------------------------* 3385 */ 3386 3387 #ifdef INET6 3388 static void 3389 sppp_ipv6cp_init(struct sppp *sp) 3390 { 3391 sp->ipv6cp.opts = 0; 3392 sp->ipv6cp.flags = 0; 3393 sp->state[IDX_IPV6CP] = STATE_INITIAL; 3394 sp->fail_counter[IDX_IPV6CP] = 0; 3395 sp->pp_seq[IDX_IPV6CP] = 0; 3396 sp->pp_rseq[IDX_IPV6CP] = 0; 3397 #if defined(__NetBSD__) 3398 callout_init(&sp->ch[IDX_IPV6CP]); 3399 #endif 3400 #if defined(__DragonFly__) 3401 callout_init(&sp->timeout[IDX_IPV6CP]); 3402 #endif 3403 } 3404 3405 static void 3406 sppp_ipv6cp_up(struct sppp *sp) 3407 { 3408 sppp_up_event(&ipv6cp, sp); 3409 } 3410 3411 static void 3412 sppp_ipv6cp_down(struct sppp *sp) 3413 { 3414 sppp_down_event(&ipv6cp, sp); 3415 } 3416 3417 static void 3418 sppp_ipv6cp_open(struct sppp *sp) 3419 { 3420 STDDCL; 3421 struct in6_addr myaddr, hisaddr; 3422 3423 #ifdef IPV6CP_MYIFID_DYN 3424 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3425 #else 3426 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3427 #endif 3428 3429 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3430 /* 3431 * If we don't have our address, this probably means our 3432 * interface doesn't want to talk IPv6 at all. (This could 3433 * be the case if somebody wants to speak only IPX, for 3434 * example.) Don't open IPv6CP in this case. 3435 */ 3436 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3437 /* XXX this message should go away */ 3438 if (debug) 3439 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n", 3440 SPP_ARGS(ifp)); 3441 return; 3442 } 3443 3444 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3445 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3446 sppp_open_event(&ipv6cp, sp); 3447 } 3448 3449 static void 3450 sppp_ipv6cp_close(struct sppp *sp) 3451 { 3452 sppp_close_event(&ipv6cp, sp); 3453 } 3454 3455 static void 3456 sppp_ipv6cp_TO(void *cookie) 3457 { 3458 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3459 } 3460 3461 /* 3462 * Analyze a configure request. Return true if it was agreeable, and 3463 * caused action sca, false if it has been rejected or nak'ed, and 3464 * caused action scn. (The return value is used to make the state 3465 * transition decision in the state automaton.) 3466 */ 3467 static int 3468 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3469 { 3470 u_char *buf, *r, *p; 3471 struct ifnet *ifp = &sp->pp_if; 3472 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3473 struct in6_addr myaddr, desiredaddr, suggestaddr; 3474 int ifidcount; 3475 int type; 3476 int collision, nohisaddr; 3477 3478 len -= 4; 3479 origlen = len; 3480 /* 3481 * Make sure to allocate a buf that can at least hold a 3482 * conf-nak with an `address' option. We might need it below. 3483 */ 3484 buf = r = kmalloc ((len < 6? 6: len), M_TEMP, M_INTWAIT); 3485 3486 /* pass 1: see if we can recognize them */ 3487 if (debug) 3488 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:", 3489 SPP_ARGS(ifp)); 3490 p = (void*) (h+1); 3491 ifidcount = 0; 3492 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3493 /* Sanity check option length */ 3494 if (p[1] > len) { 3495 /* XXX just RXJ? */ 3496 log(-1, "%s: received malicious IPCPv6 option, " 3497 "dropping\n", ifp->if_xname); 3498 goto drop; 3499 } 3500 if (debug) 3501 log(-1, " %s", sppp_ipv6cp_opt_name(*p)); 3502 switch (*p) { 3503 case IPV6CP_OPT_IFID: 3504 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3505 /* correctly formed address option */ 3506 ifidcount++; 3507 continue; 3508 } 3509 if (debug) 3510 log(-1, " [invalid]"); 3511 break; 3512 #ifdef notyet 3513 case IPV6CP_OPT_COMPRESSION: 3514 if (len >= 4 && p[1] >= 4) { 3515 /* correctly formed compress option */ 3516 continue; 3517 } 3518 if (debug) 3519 log(-1, " [invalid]"); 3520 break; 3521 #endif 3522 default: 3523 /* Others not supported. */ 3524 if (debug) 3525 log(-1, " [rej]"); 3526 break; 3527 } 3528 /* Add the option to rejected list. */ 3529 bcopy (p, r, p[1]); 3530 r += p[1]; 3531 rlen += p[1]; 3532 } 3533 if (rlen) { 3534 if (debug) 3535 log(-1, " send conf-rej\n"); 3536 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3537 goto end; 3538 } else if (debug) 3539 log(-1, "\n"); 3540 3541 /* pass 2: parse option values */ 3542 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3543 if (debug) 3544 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ", 3545 SPP_ARGS(ifp)); 3546 p = (void*) (h+1); 3547 len = origlen; 3548 type = CONF_ACK; 3549 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3550 if (debug) 3551 log(-1, " %s", sppp_ipv6cp_opt_name(*p)); 3552 switch (*p) { 3553 #ifdef notyet 3554 case IPV6CP_OPT_COMPRESSION: 3555 continue; 3556 #endif 3557 case IPV6CP_OPT_IFID: 3558 bzero(&desiredaddr, sizeof(desiredaddr)); 3559 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3560 collision = (bcmp(&desiredaddr.s6_addr[8], 3561 &myaddr.s6_addr[8], 8) == 0); 3562 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3563 3564 desiredaddr.s6_addr16[0] = htons(0xfe80); 3565 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3566 3567 if (!collision && !nohisaddr) { 3568 /* no collision, hisaddr known - Conf-Ack */ 3569 type = CONF_ACK; 3570 3571 if (debug) { 3572 log(-1, " %s [%s]", 3573 ip6_sprintf(&desiredaddr), 3574 sppp_cp_type_name(type)); 3575 } 3576 continue; 3577 } 3578 3579 bzero(&suggestaddr, sizeof(&suggestaddr)); 3580 if (collision && nohisaddr) { 3581 /* collision, hisaddr unknown - Conf-Rej */ 3582 type = CONF_REJ; 3583 bzero(&p[2], 8); 3584 } else { 3585 /* 3586 * - no collision, hisaddr unknown, or 3587 * - collision, hisaddr known 3588 * Conf-Nak, suggest hisaddr 3589 */ 3590 type = CONF_NAK; 3591 sppp_suggest_ip6_addr(sp, &suggestaddr); 3592 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3593 } 3594 if (debug) 3595 log(-1, " %s [%s]", ip6_sprintf(&desiredaddr), 3596 sppp_cp_type_name(type)); 3597 break; 3598 } 3599 /* Add the option to nak'ed list. */ 3600 bcopy (p, r, p[1]); 3601 r += p[1]; 3602 rlen += p[1]; 3603 } 3604 3605 if (rlen == 0 && type == CONF_ACK) { 3606 if (debug) 3607 log(-1, " send %s\n", sppp_cp_type_name(type)); 3608 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1); 3609 } else { 3610 #ifdef DIAGNOSTIC 3611 if (type == CONF_ACK) 3612 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3613 #endif 3614 3615 if (debug) { 3616 log(-1, " send %s suggest %s\n", 3617 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3618 } 3619 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3620 } 3621 3622 end: 3623 kfree (buf, M_TEMP); 3624 return (rlen == 0); 3625 3626 drop: 3627 kfree(buf, M_TEMP); 3628 return (-1); 3629 } 3630 3631 /* 3632 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3633 * negotiation. 3634 */ 3635 static void 3636 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3637 { 3638 u_char *buf, *p; 3639 struct ifnet *ifp = &sp->pp_if; 3640 int debug = ifp->if_flags & IFF_DEBUG; 3641 3642 len -= 4; 3643 buf = kmalloc (len, M_TEMP, M_INTWAIT); 3644 3645 if (debug) 3646 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:", 3647 SPP_ARGS(ifp)); 3648 3649 p = (void*) (h+1); 3650 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3651 if (p[1] > len) { 3652 /* XXX just RXJ? */ 3653 log(-1, "%s: received malicious IPCPv6 option, " 3654 "dropping\n", ifp->if_xname); 3655 goto drop; 3656 } 3657 if (debug) 3658 log(-1, " %s", sppp_ipv6cp_opt_name(*p)); 3659 switch (*p) { 3660 case IPV6CP_OPT_IFID: 3661 /* 3662 * Peer doesn't grok address option. This is 3663 * bad. XXX Should we better give up here? 3664 */ 3665 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3666 break; 3667 #ifdef notyet 3668 case IPV6CP_OPT_COMPRESS: 3669 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3670 break; 3671 #endif 3672 } 3673 } 3674 if (debug) 3675 log(-1, "\n"); 3676 drop: 3677 kfree (buf, M_TEMP); 3678 return; 3679 } 3680 3681 /* 3682 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3683 * negotiation. 3684 */ 3685 static void 3686 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3687 { 3688 u_char *buf, *p; 3689 struct ifnet *ifp = &sp->pp_if; 3690 int debug = ifp->if_flags & IFF_DEBUG; 3691 struct in6_addr suggestaddr; 3692 3693 len -= 4; 3694 buf = kmalloc (len, M_TEMP, M_INTWAIT); 3695 3696 if (debug) 3697 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:", 3698 SPP_ARGS(ifp)); 3699 3700 p = (void*) (h+1); 3701 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3702 if (p[1] > len) { 3703 /* XXX just RXJ? */ 3704 log(-1, "%s: received malicious IPCPv6 option, " 3705 "dropping\n", ifp->if_xname); 3706 goto drop; 3707 } 3708 if (debug) 3709 log(-1, " %s", sppp_ipv6cp_opt_name(*p)); 3710 switch (*p) { 3711 case IPV6CP_OPT_IFID: 3712 /* 3713 * Peer doesn't like our local ifid. See 3714 * if we can do something for him. We'll drop 3715 * him our address then. 3716 */ 3717 if (len < 10 || p[1] != 10) 3718 break; 3719 bzero(&suggestaddr, sizeof(suggestaddr)); 3720 suggestaddr.s6_addr16[0] = htons(0xfe80); 3721 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3722 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3723 3724 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3725 if (debug) 3726 log(-1, " [suggestaddr %s]", 3727 ip6_sprintf(&suggestaddr)); 3728 #ifdef IPV6CP_MYIFID_DYN 3729 /* 3730 * When doing dynamic address assignment, 3731 * we accept his offer. 3732 */ 3733 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3734 struct in6_addr lastsuggest; 3735 /* 3736 * If <suggested myaddr from peer> equals to 3737 * <hisaddr we have suggested last time>, 3738 * we have a collision. generate new random 3739 * ifid. 3740 */ 3741 sppp_suggest_ip6_addr(&lastsuggest); 3742 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3743 lastsuggest)) { 3744 if (debug) 3745 log(-1, " [random]"); 3746 sppp_gen_ip6_addr(sp, &suggestaddr); 3747 } 3748 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3749 if (debug) 3750 log(-1, " [agree]"); 3751 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3752 } 3753 #else 3754 /* 3755 * Since we do not do dynamic address assignment, 3756 * we ignore it and thus continue to negotiate 3757 * our already existing value. This can possibly 3758 * go into infinite request-reject loop. 3759 * 3760 * This is not likely because we normally use 3761 * ifid based on MAC-address. 3762 * If you have no ethernet card on the node, too bad. 3763 * XXX should we use fail_counter? 3764 */ 3765 #endif 3766 break; 3767 #ifdef notyet 3768 case IPV6CP_OPT_COMPRESS: 3769 /* 3770 * Peer wants different compression parameters. 3771 */ 3772 break; 3773 #endif 3774 } 3775 } 3776 if (debug) 3777 log(-1, "\n"); 3778 drop: 3779 kfree (buf, M_TEMP); 3780 return; 3781 } 3782 static void 3783 sppp_ipv6cp_tlu(struct sppp *sp) 3784 { 3785 /* we are up - notify isdn daemon */ 3786 if (sp->pp_con) 3787 sp->pp_con(sp); 3788 } 3789 3790 static void 3791 sppp_ipv6cp_tld(struct sppp *sp) 3792 { 3793 } 3794 3795 static void 3796 sppp_ipv6cp_tls(struct sppp *sp) 3797 { 3798 /* indicate to LCP that it must stay alive */ 3799 sp->lcp.protos |= (1 << IDX_IPV6CP); 3800 } 3801 3802 static void 3803 sppp_ipv6cp_tlf(struct sppp *sp) 3804 { 3805 3806 #if 0 /* need #if 0 to close IPv6CP properly */ 3807 /* we no longer need LCP */ 3808 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3809 sppp_lcp_check_and_close(sp); 3810 #endif 3811 } 3812 3813 static void 3814 sppp_ipv6cp_scr(struct sppp *sp) 3815 { 3816 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3817 struct in6_addr ouraddr; 3818 int i = 0; 3819 3820 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3821 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3822 opt[i++] = IPV6CP_OPT_IFID; 3823 opt[i++] = 10; 3824 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3825 i += 8; 3826 } 3827 3828 #ifdef notyet 3829 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3830 opt[i++] = IPV6CP_OPT_COMPRESSION; 3831 opt[i++] = 4; 3832 opt[i++] = 0; /* TBD */ 3833 opt[i++] = 0; /* TBD */ 3834 /* variable length data may follow */ 3835 } 3836 #endif 3837 3838 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3839 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3840 } 3841 #else /*INET6*/ 3842 static void 3843 sppp_ipv6cp_init(struct sppp *sp) 3844 { 3845 } 3846 3847 static void 3848 sppp_ipv6cp_up(struct sppp *sp) 3849 { 3850 } 3851 3852 static void 3853 sppp_ipv6cp_down(struct sppp *sp) 3854 { 3855 } 3856 3857 3858 static void 3859 sppp_ipv6cp_open(struct sppp *sp) 3860 { 3861 } 3862 3863 static void 3864 sppp_ipv6cp_close(struct sppp *sp) 3865 { 3866 } 3867 3868 static void 3869 sppp_ipv6cp_TO(void *sp) 3870 { 3871 } 3872 3873 static int 3874 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3875 { 3876 return 0; 3877 } 3878 3879 static void 3880 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3881 { 3882 } 3883 3884 static void 3885 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3886 { 3887 } 3888 3889 static void 3890 sppp_ipv6cp_tlu(struct sppp *sp) 3891 { 3892 } 3893 3894 static void 3895 sppp_ipv6cp_tld(struct sppp *sp) 3896 { 3897 } 3898 3899 static void 3900 sppp_ipv6cp_tls(struct sppp *sp) 3901 { 3902 } 3903 3904 static void 3905 sppp_ipv6cp_tlf(struct sppp *sp) 3906 { 3907 } 3908 3909 static void 3910 sppp_ipv6cp_scr(struct sppp *sp) 3911 { 3912 } 3913 #endif /*INET6*/ 3914 3915 /* 3916 *--------------------------------------------------------------------------* 3917 * * 3918 * The CHAP implementation. * 3919 * * 3920 *--------------------------------------------------------------------------* 3921 */ 3922 3923 /* 3924 * The authentication protocols don't employ a full-fledged state machine as 3925 * the control protocols do, since they do have Open and Close events, but 3926 * not Up and Down, nor are they explicitly terminated. Also, use of the 3927 * authentication protocols may be different in both directions (this makes 3928 * sense, think of a machine that never accepts incoming calls but only 3929 * calls out, it doesn't require the called party to authenticate itself). 3930 * 3931 * Our state machine for the local authentication protocol (we are requesting 3932 * the peer to authenticate) looks like: 3933 * 3934 * RCA- 3935 * +--------------------------------------------+ 3936 * V scn,tld| 3937 * +--------+ Close +---------+ RCA+ 3938 * | |<----------------------------------| |------+ 3939 * +--->| Closed | TO* | Opened | sca | 3940 * | | |-----+ +-------| |<-----+ 3941 * | +--------+ irc | | +---------+ 3942 * | ^ | | ^ 3943 * | | | | | 3944 * | | | | | 3945 * | TO-| | | | 3946 * | |tld TO+ V | | 3947 * | | +------->+ | | 3948 * | | | | | | 3949 * | +--------+ V | | 3950 * | | |<----+<--------------------+ | 3951 * | | Req- | scr | 3952 * | | Sent | | 3953 * | | | | 3954 * | +--------+ | 3955 * | RCA- | | RCA+ | 3956 * +------+ +------------------------------------------+ 3957 * scn,tld sca,irc,ict,tlu 3958 * 3959 * 3960 * with: 3961 * 3962 * Open: LCP reached authentication phase 3963 * Close: LCP reached terminate phase 3964 * 3965 * RCA+: received reply (pap-req, chap-response), acceptable 3966 * RCN: received reply (pap-req, chap-response), not acceptable 3967 * TO+: timeout with restart counter >= 0 3968 * TO-: timeout with restart counter < 0 3969 * TO*: reschedule timeout for CHAP 3970 * 3971 * scr: send request packet (none for PAP, chap-challenge) 3972 * sca: send ack packet (pap-ack, chap-success) 3973 * scn: send nak packet (pap-nak, chap-failure) 3974 * ict: initialize re-challenge timer (CHAP only) 3975 * 3976 * tlu: this-layer-up, LCP reaches network phase 3977 * tld: this-layer-down, LCP enters terminate phase 3978 * 3979 * Note that in CHAP mode, after sending a new challenge, while the state 3980 * automaton falls back into Req-Sent state, it doesn't signal a tld 3981 * event to LCP, so LCP remains in network phase. Only after not getting 3982 * any response (or after getting an unacceptable response), CHAP closes, 3983 * causing LCP to enter terminate phase. 3984 * 3985 * With PAP, there is no initial request that can be sent. The peer is 3986 * expected to send one based on the successful negotiation of PAP as 3987 * the authentication protocol during the LCP option negotiation. 3988 * 3989 * Incoming authentication protocol requests (remote requests 3990 * authentication, we are peer) don't employ a state machine at all, 3991 * they are simply answered. Some peers [Ascend P50 firmware rev 3992 * 4.50] react allergically when sending IPCP requests while they are 3993 * still in authentication phase (thereby violating the standard that 3994 * demands that these NCP packets are to be discarded), so we keep 3995 * track of the peer demanding us to authenticate, and only proceed to 3996 * phase network once we've seen a positive acknowledge for the 3997 * authentication. 3998 */ 3999 4000 /* 4001 * Handle incoming CHAP packets. 4002 */ 4003 void 4004 sppp_chap_input(struct sppp *sp, struct mbuf *m) 4005 { 4006 STDDCL; 4007 struct lcp_header *h; 4008 int len; 4009 u_char *value, *name, digest[AUTHKEYLEN], dsize; 4010 int value_len, name_len; 4011 MD5_CTX ctx; 4012 4013 len = m->m_pkthdr.len; 4014 if (len < 4) { 4015 if (debug) 4016 log(LOG_DEBUG, 4017 SPP_FMT "chap invalid packet length: %d bytes\n", 4018 SPP_ARGS(ifp), len); 4019 return; 4020 } 4021 h = mtod (m, struct lcp_header*); 4022 if (len > ntohs (h->len)) 4023 len = ntohs (h->len); 4024 4025 switch (h->type) { 4026 /* challenge, failure and success are his authproto */ 4027 case CHAP_CHALLENGE: 4028 value = 1 + (u_char*)(h+1); 4029 value_len = value[-1]; 4030 name = value + value_len; 4031 name_len = len - value_len - 5; 4032 if (name_len < 0) { 4033 if (debug) { 4034 log(LOG_DEBUG, 4035 SPP_FMT "chap corrupted challenge " 4036 "<%s id=0x%x len=%d", 4037 SPP_ARGS(ifp), 4038 sppp_auth_type_name(PPP_CHAP, h->type), 4039 h->ident, ntohs(h->len)); 4040 sppp_print_bytes((u_char*) (h+1), len-4); 4041 log(-1, ">\n"); 4042 } 4043 break; 4044 } 4045 4046 if (debug) { 4047 log(LOG_DEBUG, 4048 SPP_FMT "chap input <%s id=0x%x len=%d name=", 4049 SPP_ARGS(ifp), 4050 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 4051 ntohs(h->len)); 4052 sppp_print_string((char*) name, name_len); 4053 log(-1, " value-size=%d value=", value_len); 4054 sppp_print_bytes(value, value_len); 4055 log(-1, ">\n"); 4056 } 4057 4058 /* Compute reply value. */ 4059 MD5Init(&ctx); 4060 MD5Update(&ctx, &h->ident, 1); 4061 MD5Update(&ctx, sp->myauth.secret, 4062 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN)); 4063 MD5Update(&ctx, value, value_len); 4064 MD5Final(digest, &ctx); 4065 dsize = sizeof digest; 4066 4067 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 4068 sizeof dsize, (const char *)&dsize, 4069 sizeof digest, digest, 4070 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 4071 sp->myauth.name, 4072 0); 4073 break; 4074 4075 case CHAP_SUCCESS: 4076 if (debug) { 4077 log(LOG_DEBUG, SPP_FMT "chap success", 4078 SPP_ARGS(ifp)); 4079 if (len > 4) { 4080 log(-1, ": "); 4081 sppp_print_string((char*)(h + 1), len - 4); 4082 } 4083 log(-1, "\n"); 4084 } 4085 4086 crit_enter(); 4087 4088 sp->pp_flags &= ~PP_NEEDAUTH; 4089 if (sp->myauth.proto == PPP_CHAP && 4090 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4091 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 4092 /* 4093 * We are authenticator for CHAP but didn't 4094 * complete yet. Leave it to tlu to proceed 4095 * to network phase. 4096 */ 4097 crit_exit(); 4098 break; 4099 } 4100 crit_exit(); 4101 sppp_phase_network(sp); 4102 break; 4103 4104 case CHAP_FAILURE: 4105 if (debug) { 4106 log(LOG_INFO, SPP_FMT "chap failure", 4107 SPP_ARGS(ifp)); 4108 if (len > 4) { 4109 log(-1, ": "); 4110 sppp_print_string((char*)(h + 1), len - 4); 4111 } 4112 log(-1, "\n"); 4113 } else 4114 log(LOG_INFO, SPP_FMT "chap failure\n", 4115 SPP_ARGS(ifp)); 4116 /* await LCP shutdown by authenticator */ 4117 break; 4118 4119 /* response is my authproto */ 4120 case CHAP_RESPONSE: 4121 value = 1 + (u_char*)(h+1); 4122 value_len = value[-1]; 4123 name = value + value_len; 4124 name_len = len - value_len - 5; 4125 if (name_len < 0) { 4126 if (debug) { 4127 log(LOG_DEBUG, 4128 SPP_FMT "chap corrupted response " 4129 "<%s id=0x%x len=%d", 4130 SPP_ARGS(ifp), 4131 sppp_auth_type_name(PPP_CHAP, h->type), 4132 h->ident, ntohs(h->len)); 4133 sppp_print_bytes((u_char*)(h+1), len-4); 4134 log(-1, ">\n"); 4135 } 4136 break; 4137 } 4138 if (h->ident != sp->confid[IDX_CHAP]) { 4139 if (debug) 4140 log(LOG_DEBUG, 4141 SPP_FMT "chap dropping response for old ID " 4142 "(got %d, expected %d)\n", 4143 SPP_ARGS(ifp), 4144 h->ident, sp->confid[IDX_CHAP]); 4145 break; 4146 } 4147 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) 4148 || bcmp(name, sp->hisauth.name, name_len) != 0) { 4149 log(LOG_INFO, SPP_FMT "chap response, his name ", 4150 SPP_ARGS(ifp)); 4151 sppp_print_string(name, name_len); 4152 log(-1, " != expected "); 4153 sppp_print_string(sp->hisauth.name, 4154 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)); 4155 log(-1, "\n"); 4156 } 4157 if (debug) { 4158 log(LOG_DEBUG, SPP_FMT "chap input(%s) " 4159 "<%s id=0x%x len=%d name=", 4160 SPP_ARGS(ifp), 4161 sppp_state_name(sp->state[IDX_CHAP]), 4162 sppp_auth_type_name(PPP_CHAP, h->type), 4163 h->ident, ntohs (h->len)); 4164 sppp_print_string((char*)name, name_len); 4165 log(-1, " value-size=%d value=", value_len); 4166 sppp_print_bytes(value, value_len); 4167 log(-1, ">\n"); 4168 } 4169 if (value_len != AUTHKEYLEN) { 4170 if (debug) 4171 log(LOG_DEBUG, 4172 SPP_FMT "chap bad hash value length: " 4173 "%d bytes, should be %d\n", 4174 SPP_ARGS(ifp), value_len, 4175 AUTHKEYLEN); 4176 break; 4177 } 4178 4179 MD5Init(&ctx); 4180 MD5Update(&ctx, &h->ident, 1); 4181 MD5Update(&ctx, sp->hisauth.secret, 4182 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN)); 4183 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN); 4184 MD5Final(digest, &ctx); 4185 4186 #define FAILMSG "Failed..." 4187 #define SUCCMSG "Welcome!" 4188 4189 if (value_len != sizeof digest || 4190 bcmp(digest, value, value_len) != 0) { 4191 /* action scn, tld */ 4192 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 4193 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4194 0); 4195 chap.tld(sp); 4196 break; 4197 } 4198 /* action sca, perhaps tlu */ 4199 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 4200 sp->state[IDX_CHAP] == STATE_OPENED) 4201 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 4202 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4203 0); 4204 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 4205 sppp_cp_change_state(&chap, sp, STATE_OPENED); 4206 chap.tlu(sp); 4207 } 4208 break; 4209 4210 default: 4211 /* Unknown CHAP packet type -- ignore. */ 4212 if (debug) { 4213 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) " 4214 "<0x%x id=0x%xh len=%d", 4215 SPP_ARGS(ifp), 4216 sppp_state_name(sp->state[IDX_CHAP]), 4217 h->type, h->ident, ntohs(h->len)); 4218 sppp_print_bytes((u_char*)(h+1), len-4); 4219 log(-1, ">\n"); 4220 } 4221 break; 4222 4223 } 4224 } 4225 4226 static void 4227 sppp_chap_init(struct sppp *sp) 4228 { 4229 /* Chap doesn't have STATE_INITIAL at all. */ 4230 sp->state[IDX_CHAP] = STATE_CLOSED; 4231 sp->fail_counter[IDX_CHAP] = 0; 4232 sp->pp_seq[IDX_CHAP] = 0; 4233 sp->pp_rseq[IDX_CHAP] = 0; 4234 #if defined(__DragonFly__) 4235 callout_init(&sp->timeout[IDX_CHAP]); 4236 #endif 4237 } 4238 4239 static void 4240 sppp_chap_open(struct sppp *sp) 4241 { 4242 if (sp->myauth.proto == PPP_CHAP && 4243 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4244 /* we are authenticator for CHAP, start it */ 4245 chap.scr(sp); 4246 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4247 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4248 } 4249 /* nothing to be done if we are peer, await a challenge */ 4250 } 4251 4252 static void 4253 sppp_chap_close(struct sppp *sp) 4254 { 4255 if (sp->state[IDX_CHAP] != STATE_CLOSED) 4256 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4257 } 4258 4259 static void 4260 sppp_chap_TO(void *cookie) 4261 { 4262 struct sppp *sp = (struct sppp *)cookie; 4263 STDDCL; 4264 4265 crit_enter(); 4266 4267 if (debug) 4268 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n", 4269 SPP_ARGS(ifp), 4270 sppp_state_name(sp->state[IDX_CHAP]), 4271 sp->rst_counter[IDX_CHAP]); 4272 4273 if (--sp->rst_counter[IDX_CHAP] < 0) 4274 /* TO- event */ 4275 switch (sp->state[IDX_CHAP]) { 4276 case STATE_REQ_SENT: 4277 chap.tld(sp); 4278 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 4279 break; 4280 } 4281 else 4282 /* TO+ (or TO*) event */ 4283 switch (sp->state[IDX_CHAP]) { 4284 case STATE_OPENED: 4285 /* TO* event */ 4286 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4287 /* fall through */ 4288 case STATE_REQ_SENT: 4289 chap.scr(sp); 4290 /* sppp_cp_change_state() will restart the timer */ 4291 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 4292 break; 4293 } 4294 4295 crit_exit(); 4296 } 4297 4298 static void 4299 sppp_chap_tlu(struct sppp *sp) 4300 { 4301 STDDCL; 4302 int i; 4303 4304 i = 0; 4305 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 4306 4307 /* 4308 * Some broken CHAP implementations (Conware CoNet, firmware 4309 * 4.0.?) don't want to re-authenticate their CHAP once the 4310 * initial challenge-response exchange has taken place. 4311 * Provide for an option to avoid rechallenges. 4312 */ 4313 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) { 4314 /* 4315 * Compute the re-challenge timeout. This will yield 4316 * a number between 300 and 810 seconds. 4317 */ 4318 i = 300 + ((unsigned)(krandom() & 0xff00) >> 7); 4319 callout_reset(&sp->timeout[IDX_CHAP], i * hz, chap.TO, sp); 4320 } 4321 4322 if (debug) { 4323 log(LOG_DEBUG, 4324 SPP_FMT "chap %s, ", 4325 SPP_ARGS(ifp), 4326 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu"); 4327 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) 4328 log(-1, "next re-challenge in %d seconds\n", i); 4329 else 4330 log(-1, "re-challenging suppressed\n"); 4331 } 4332 4333 crit_enter(); 4334 4335 /* indicate to LCP that we need to be closed down */ 4336 sp->lcp.protos |= (1 << IDX_CHAP); 4337 4338 if (sp->pp_flags & PP_NEEDAUTH) { 4339 /* 4340 * Remote is authenticator, but his auth proto didn't 4341 * complete yet. Defer the transition to network 4342 * phase. 4343 */ 4344 crit_exit(); 4345 return; 4346 } 4347 4348 crit_exit(); 4349 4350 /* 4351 * If we are already in phase network, we are done here. This 4352 * is the case if this is a dummy tlu event after a re-challenge. 4353 */ 4354 if (sp->pp_phase != PHASE_NETWORK) 4355 sppp_phase_network(sp); 4356 } 4357 4358 static void 4359 sppp_chap_tld(struct sppp *sp) 4360 { 4361 STDDCL; 4362 4363 if (debug) 4364 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp)); 4365 callout_stop(&sp->timeout[IDX_CHAP]); 4366 sp->lcp.protos &= ~(1 << IDX_CHAP); 4367 4368 lcp.Close(sp); 4369 } 4370 4371 static void 4372 sppp_chap_scr(struct sppp *sp) 4373 { 4374 u_long *ch, seed; 4375 u_char clen; 4376 4377 /* Compute random challenge. */ 4378 ch = (u_long *)sp->myauth.challenge; 4379 #if defined(__DragonFly__) 4380 read_random(&seed, sizeof seed); 4381 #else 4382 { 4383 struct timeval tv; 4384 microtime(&tv); 4385 seed = tv.tv_sec ^ tv.tv_usec; 4386 } 4387 #endif 4388 ch[0] = seed ^ krandom(); 4389 ch[1] = seed ^ krandom(); 4390 ch[2] = seed ^ krandom(); 4391 ch[3] = seed ^ krandom(); 4392 clen = AUTHKEYLEN; 4393 4394 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 4395 4396 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 4397 sizeof clen, (const char *)&clen, 4398 (size_t)AUTHKEYLEN, sp->myauth.challenge, 4399 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 4400 sp->myauth.name, 4401 0); 4402 } 4403 4404 /* 4405 *--------------------------------------------------------------------------* 4406 * * 4407 * The PAP implementation. * 4408 * * 4409 *--------------------------------------------------------------------------* 4410 */ 4411 /* 4412 * For PAP, we need to keep a little state also if we are the peer, not the 4413 * authenticator. This is since we don't get a request to authenticate, but 4414 * have to repeatedly authenticate ourself until we got a response (or the 4415 * retry counter is expired). 4416 */ 4417 4418 /* 4419 * Handle incoming PAP packets. */ 4420 static void 4421 sppp_pap_input(struct sppp *sp, struct mbuf *m) 4422 { 4423 STDDCL; 4424 struct lcp_header *h; 4425 int len; 4426 u_char *name, *passwd, mlen; 4427 int name_len, passwd_len; 4428 4429 /* 4430 * Malicious input might leave this uninitialized, so 4431 * init to an impossible value. 4432 */ 4433 passwd_len = -1; 4434 4435 len = m->m_pkthdr.len; 4436 if (len < 5) { 4437 if (debug) 4438 log(LOG_DEBUG, 4439 SPP_FMT "pap invalid packet length: %d bytes\n", 4440 SPP_ARGS(ifp), len); 4441 return; 4442 } 4443 h = mtod (m, struct lcp_header*); 4444 if (len > ntohs (h->len)) 4445 len = ntohs (h->len); 4446 switch (h->type) { 4447 /* PAP request is my authproto */ 4448 case PAP_REQ: 4449 name = 1 + (u_char*)(h+1); 4450 name_len = name[-1]; 4451 passwd = name + name_len + 1; 4452 if (name_len > len - 6 || 4453 (passwd_len = passwd[-1]) > len - 6 - name_len) { 4454 if (debug) { 4455 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4456 "<%s id=0x%x len=%d", 4457 SPP_ARGS(ifp), 4458 sppp_auth_type_name(PPP_PAP, h->type), 4459 h->ident, ntohs(h->len)); 4460 sppp_print_bytes((u_char*)(h+1), len-4); 4461 log(-1, ">\n"); 4462 } 4463 break; 4464 } 4465 if (debug) { 4466 log(LOG_DEBUG, SPP_FMT "pap input(%s) " 4467 "<%s id=0x%x len=%d name=", 4468 SPP_ARGS(ifp), 4469 sppp_state_name(sp->state[IDX_PAP]), 4470 sppp_auth_type_name(PPP_PAP, h->type), 4471 h->ident, ntohs(h->len)); 4472 sppp_print_string((char*)name, name_len); 4473 log(-1, " passwd="); 4474 sppp_print_string((char*)passwd, passwd_len); 4475 log(-1, ">\n"); 4476 } 4477 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) || 4478 passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) || 4479 bcmp(name, sp->hisauth.name, name_len) != 0 || 4480 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) { 4481 /* action scn, tld */ 4482 mlen = sizeof(FAILMSG) - 1; 4483 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4484 sizeof mlen, (const char *)&mlen, 4485 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4486 0); 4487 pap.tld(sp); 4488 break; 4489 } 4490 /* action sca, perhaps tlu */ 4491 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4492 sp->state[IDX_PAP] == STATE_OPENED) { 4493 mlen = sizeof(SUCCMSG) - 1; 4494 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4495 sizeof mlen, (const char *)&mlen, 4496 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4497 0); 4498 } 4499 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4500 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4501 pap.tlu(sp); 4502 } 4503 break; 4504 4505 /* ack and nak are his authproto */ 4506 case PAP_ACK: 4507 callout_stop(&sp->pap_my_to); 4508 if (debug) { 4509 log(LOG_DEBUG, SPP_FMT "pap success", 4510 SPP_ARGS(ifp)); 4511 name = 1 + (u_char *)(h + 1); 4512 name_len = name[-1]; 4513 if (len > 5 && name_len < len+4) { 4514 log(-1, ": "); 4515 sppp_print_string(name, name_len); 4516 } 4517 log(-1, "\n"); 4518 } 4519 4520 crit_enter(); 4521 4522 sp->pp_flags &= ~PP_NEEDAUTH; 4523 if (sp->myauth.proto == PPP_PAP && 4524 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4525 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4526 /* 4527 * We are authenticator for PAP but didn't 4528 * complete yet. Leave it to tlu to proceed 4529 * to network phase. 4530 */ 4531 4532 crit_exit(); 4533 4534 break; 4535 } 4536 4537 crit_exit(); 4538 4539 sppp_phase_network(sp); 4540 break; 4541 4542 case PAP_NAK: 4543 callout_stop(&sp->pap_my_to); 4544 if (debug) { 4545 log(LOG_INFO, SPP_FMT "pap failure", 4546 SPP_ARGS(ifp)); 4547 name = 1 + (u_char *)(h + 1); 4548 name_len = name[-1]; 4549 if (len > 5 && name_len < len+4) { 4550 log(-1, ": "); 4551 sppp_print_string(name, name_len); 4552 } 4553 log(-1, "\n"); 4554 } else 4555 log(LOG_INFO, SPP_FMT "pap failure\n", 4556 SPP_ARGS(ifp)); 4557 /* await LCP shutdown by authenticator */ 4558 break; 4559 4560 default: 4561 /* Unknown PAP packet type -- ignore. */ 4562 if (debug) { 4563 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4564 "<0x%x id=0x%x len=%d", 4565 SPP_ARGS(ifp), 4566 h->type, h->ident, ntohs(h->len)); 4567 sppp_print_bytes((u_char*)(h+1), len-4); 4568 log(-1, ">\n"); 4569 } 4570 break; 4571 4572 } 4573 } 4574 4575 static void 4576 sppp_pap_init(struct sppp *sp) 4577 { 4578 /* PAP doesn't have STATE_INITIAL at all. */ 4579 sp->state[IDX_PAP] = STATE_CLOSED; 4580 sp->fail_counter[IDX_PAP] = 0; 4581 sp->pp_seq[IDX_PAP] = 0; 4582 sp->pp_rseq[IDX_PAP] = 0; 4583 #if defined(__DragonFly__) 4584 callout_init(&sp->timeout[IDX_PAP]); 4585 callout_init(&sp->pap_my_to); 4586 #endif 4587 } 4588 4589 static void 4590 sppp_pap_open(struct sppp *sp) 4591 { 4592 if (sp->hisauth.proto == PPP_PAP && 4593 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4594 /* we are authenticator for PAP, start our timer */ 4595 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4596 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4597 } 4598 if (sp->myauth.proto == PPP_PAP) { 4599 /* we are peer, send a request, and start a timer */ 4600 pap.scr(sp); 4601 callout_reset(&sp->pap_my_to, sp->lcp.timeout, 4602 sppp_pap_my_TO, sp); 4603 } 4604 } 4605 4606 static void 4607 sppp_pap_close(struct sppp *sp) 4608 { 4609 if (sp->state[IDX_PAP] != STATE_CLOSED) 4610 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4611 } 4612 4613 /* 4614 * That's the timeout routine if we are authenticator. Since the 4615 * authenticator is basically passive in PAP, we can't do much here. 4616 */ 4617 static void 4618 sppp_pap_TO(void *cookie) 4619 { 4620 struct sppp *sp = (struct sppp *)cookie; 4621 STDDCL; 4622 4623 crit_enter(); 4624 4625 if (debug) 4626 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n", 4627 SPP_ARGS(ifp), 4628 sppp_state_name(sp->state[IDX_PAP]), 4629 sp->rst_counter[IDX_PAP]); 4630 4631 if (--sp->rst_counter[IDX_PAP] < 0) 4632 /* TO- event */ 4633 switch (sp->state[IDX_PAP]) { 4634 case STATE_REQ_SENT: 4635 pap.tld(sp); 4636 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4637 break; 4638 } 4639 else 4640 /* TO+ event, not very much we could do */ 4641 switch (sp->state[IDX_PAP]) { 4642 case STATE_REQ_SENT: 4643 /* sppp_cp_change_state() will restart the timer */ 4644 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4645 break; 4646 } 4647 4648 crit_exit(); 4649 } 4650 4651 /* 4652 * That's the timeout handler if we are peer. Since the peer is active, 4653 * we need to retransmit our PAP request since it is apparently lost. 4654 * XXX We should impose a max counter. 4655 */ 4656 static void 4657 sppp_pap_my_TO(void *cookie) 4658 { 4659 struct sppp *sp = (struct sppp *)cookie; 4660 STDDCL; 4661 4662 if (debug) 4663 log(LOG_DEBUG, SPP_FMT "pap peer TO\n", 4664 SPP_ARGS(ifp)); 4665 4666 pap.scr(sp); 4667 } 4668 4669 static void 4670 sppp_pap_tlu(struct sppp *sp) 4671 { 4672 STDDCL; 4673 4674 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4675 4676 if (debug) 4677 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 4678 SPP_ARGS(ifp), pap.name); 4679 4680 crit_enter(); 4681 4682 /* indicate to LCP that we need to be closed down */ 4683 sp->lcp.protos |= (1 << IDX_PAP); 4684 4685 if (sp->pp_flags & PP_NEEDAUTH) { 4686 /* 4687 * Remote is authenticator, but his auth proto didn't 4688 * complete yet. Defer the transition to network 4689 * phase. 4690 */ 4691 crit_exit(); 4692 return; 4693 } 4694 crit_exit(); 4695 sppp_phase_network(sp); 4696 } 4697 4698 static void 4699 sppp_pap_tld(struct sppp *sp) 4700 { 4701 STDDCL; 4702 4703 if (debug) 4704 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp)); 4705 callout_stop(&sp->timeout[IDX_PAP]); 4706 callout_stop(&sp->pap_my_to); 4707 sp->lcp.protos &= ~(1 << IDX_PAP); 4708 4709 lcp.Close(sp); 4710 } 4711 4712 static void 4713 sppp_pap_scr(struct sppp *sp) 4714 { 4715 u_char idlen, pwdlen; 4716 4717 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4718 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN); 4719 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN); 4720 4721 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4722 sizeof idlen, (const char *)&idlen, 4723 (size_t)idlen, sp->myauth.name, 4724 sizeof pwdlen, (const char *)&pwdlen, 4725 (size_t)pwdlen, sp->myauth.secret, 4726 0); 4727 } 4728 4729 /* 4730 * Random miscellaneous functions. 4731 */ 4732 4733 /* 4734 * Send a PAP or CHAP proto packet. 4735 * 4736 * Varadic function, each of the elements for the ellipsis is of type 4737 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4738 * mlen == 0. 4739 * NOTE: never declare variadic functions with types subject to type 4740 * promotion (i.e. u_char). This is asking for big trouble depending 4741 * on the architecture you are on... 4742 */ 4743 4744 static void 4745 sppp_auth_send(const struct cp *cp, struct sppp *sp, 4746 unsigned int type, unsigned int id, 4747 ...) 4748 { 4749 STDDCL; 4750 struct ppp_header *h; 4751 struct lcp_header *lh; 4752 struct mbuf *m; 4753 u_char *p; 4754 int len; 4755 unsigned int mlen; 4756 const char *msg; 4757 __va_list ap; 4758 4759 MGETHDR (m, MB_DONTWAIT, MT_DATA); 4760 if (! m) 4761 return; 4762 m->m_pkthdr.rcvif = 0; 4763 4764 h = mtod (m, struct ppp_header*); 4765 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4766 h->control = PPP_UI; /* Unnumbered Info */ 4767 h->protocol = htons(cp->proto); 4768 4769 lh = (struct lcp_header*)(h + 1); 4770 lh->type = type; 4771 lh->ident = id; 4772 p = (u_char*) (lh+1); 4773 4774 __va_start(ap, id); 4775 len = 0; 4776 4777 while ((mlen = (unsigned int)__va_arg(ap, size_t)) != 0) { 4778 msg = __va_arg(ap, const char *); 4779 len += mlen; 4780 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) { 4781 __va_end(ap); 4782 m_freem(m); 4783 return; 4784 } 4785 4786 bcopy(msg, p, mlen); 4787 p += mlen; 4788 } 4789 __va_end(ap); 4790 4791 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len; 4792 lh->len = htons (LCP_HEADER_LEN + len); 4793 4794 if (debug) { 4795 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 4796 SPP_ARGS(ifp), cp->name, 4797 sppp_auth_type_name(cp->proto, lh->type), 4798 lh->ident, ntohs(lh->len)); 4799 sppp_print_bytes((u_char*) (lh+1), len); 4800 log(-1, ">\n"); 4801 } 4802 if (IF_QFULL (&sp->pp_cpq)) { 4803 IF_DROP (&sp->pp_fastq); 4804 IF_DROP (&ifp->if_snd); 4805 m_freem (m); 4806 ++ifp->if_oerrors; 4807 } else 4808 IF_ENQUEUE (&sp->pp_cpq, m); 4809 if (! (ifp->if_flags & IFF_OACTIVE)) 4810 (*ifp->if_start) (ifp); 4811 ifp->if_obytes += m->m_pkthdr.len + 3; 4812 } 4813 4814 /* 4815 * Send keepalive packets, every 10 seconds. 4816 */ 4817 static void 4818 sppp_keepalive(void *dummy) 4819 { 4820 struct sppp *sp; 4821 4822 crit_enter(); 4823 4824 for (sp=spppq; sp; sp=sp->pp_next) { 4825 struct ifnet *ifp = &sp->pp_if; 4826 4827 /* Keepalive mode disabled or channel down? */ 4828 if (! (sp->pp_flags & PP_KEEPALIVE) || 4829 ! (ifp->if_flags & IFF_RUNNING)) 4830 continue; 4831 4832 /* No keepalive in PPP mode if LCP not opened yet. */ 4833 if (sp->pp_mode != IFF_CISCO && 4834 sp->pp_phase < PHASE_AUTHENTICATE) 4835 continue; 4836 4837 if (sp->pp_alivecnt == MAXALIVECNT) { 4838 /* No keepalive packets got. Stop the interface. */ 4839 kprintf (SPP_FMT "down\n", SPP_ARGS(ifp)); 4840 if_down (ifp); 4841 IF_DRAIN(&sp->pp_cpq); 4842 if (sp->pp_mode != IFF_CISCO) { 4843 /* XXX */ 4844 /* Shut down the PPP link. */ 4845 lcp.Down(sp); 4846 /* Initiate negotiation. XXX */ 4847 lcp.Up(sp); 4848 } 4849 } 4850 ifnet_serialize_all(ifp); 4851 if (sp->pp_alivecnt <= MAXALIVECNT) 4852 ++sp->pp_alivecnt; 4853 if (sp->pp_mode == IFF_CISCO) 4854 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, 4855 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4856 else if (sp->pp_phase >= PHASE_AUTHENTICATE) { 4857 long nmagic = htonl (sp->lcp.magic); 4858 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4859 sppp_cp_send (sp, PPP_LCP, ECHO_REQ, 4860 sp->lcp.echoid, 4, &nmagic); 4861 } 4862 ifnet_deserialize_all(ifp); 4863 } 4864 callout_reset(&keepalive_timeout, hz * 10, sppp_keepalive, NULL); 4865 crit_exit(); 4866 } 4867 4868 /* 4869 * Get both IP addresses. 4870 */ 4871 static void 4872 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask) 4873 { 4874 struct ifnet *ifp = &sp->pp_if; 4875 struct ifaddr_container *ifac; 4876 struct ifaddr *ifa; 4877 struct sockaddr_in *si, *sm; 4878 u_long ssrc, ddst; 4879 4880 sm = NULL; 4881 ssrc = ddst = 0L; 4882 /* 4883 * Pick the first AF_INET address from the list, 4884 * aliases don't make any sense on a p2p link anyway. 4885 */ 4886 si = 0; 4887 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 4888 ifa = ifac->ifa; 4889 if (ifa->ifa_addr->sa_family == AF_INET) { 4890 si = (struct sockaddr_in *)ifa->ifa_addr; 4891 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4892 if (si) 4893 break; 4894 } 4895 } 4896 if (ifac != NULL) { 4897 if (si && si->sin_addr.s_addr) { 4898 ssrc = si->sin_addr.s_addr; 4899 if (srcmask) 4900 *srcmask = ntohl(sm->sin_addr.s_addr); 4901 } 4902 4903 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4904 if (si && si->sin_addr.s_addr) 4905 ddst = si->sin_addr.s_addr; 4906 } 4907 4908 if (dst) *dst = ntohl(ddst); 4909 if (src) *src = ntohl(ssrc); 4910 } 4911 4912 /* 4913 * Set my IP address. Must be called at splimp. 4914 */ 4915 static void 4916 sppp_set_ip_addr(struct sppp *sp, u_long src) 4917 { 4918 STDDCL; 4919 struct ifaddr_container *ifac; 4920 struct ifaddr *ifa = NULL; 4921 struct sockaddr_in *si; 4922 struct in_ifaddr *ia; 4923 4924 /* 4925 * Pick the first AF_INET address from the list, 4926 * aliases don't make any sense on a p2p link anyway. 4927 */ 4928 si = 0; 4929 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 4930 ifa = ifac->ifa; 4931 if (ifa->ifa_addr->sa_family == AF_INET) { 4932 si = (struct sockaddr_in *)ifa->ifa_addr; 4933 if (si) 4934 break; 4935 } 4936 } 4937 4938 if (ifac != NULL && si != NULL) { 4939 int error; 4940 #if __NetBSD_Version__ >= 103080000 4941 struct sockaddr_in new_sin = *si; 4942 4943 new_sin.sin_addr.s_addr = htonl(src); 4944 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 1); 4945 if(debug && error) 4946 { 4947 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: in_ifinit " 4948 " failed, error=%d\n", SPP_ARGS(ifp), error); 4949 } 4950 #else 4951 /* delete old route */ 4952 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST); 4953 if(debug && error) 4954 { 4955 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n", 4956 SPP_ARGS(ifp), error); 4957 } 4958 4959 ia = ifatoia(ifa); 4960 in_iahash_remove(ia); 4961 4962 /* set new address */ 4963 si->sin_addr.s_addr = htonl(src); 4964 in_iahash_insert(ia); 4965 4966 /* add new route */ 4967 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST); 4968 if (debug && error) 4969 { 4970 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d", 4971 SPP_ARGS(ifp), error); 4972 } 4973 #endif 4974 } 4975 } 4976 4977 #ifdef INET6 4978 /* 4979 * Get both IPv6 addresses. 4980 */ 4981 static void 4982 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4983 struct in6_addr *srcmask) 4984 { 4985 struct ifnet *ifp = &sp->pp_if; 4986 struct ifaddr_container *ifac; 4987 struct ifaddr *ifa; 4988 struct sockaddr_in6 *si, *sm; 4989 struct in6_addr ssrc, ddst; 4990 4991 sm = NULL; 4992 bzero(&ssrc, sizeof(ssrc)); 4993 bzero(&ddst, sizeof(ddst)); 4994 /* 4995 * Pick the first link-local AF_INET6 address from the list, 4996 * aliases don't make any sense on a p2p link anyway. 4997 */ 4998 si = 0; 4999 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 5000 ifa = ifac->ifa; 5001 if (ifa->ifa_addr->sa_family == AF_INET6) { 5002 si = (struct sockaddr_in6 *)ifa->ifa_addr; 5003 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 5004 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 5005 break; 5006 } 5007 } 5008 if (ifac != NULL) { 5009 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 5010 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 5011 if (srcmask) { 5012 bcopy(&sm->sin6_addr, srcmask, 5013 sizeof(*srcmask)); 5014 } 5015 } 5016 5017 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 5018 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 5019 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 5020 } 5021 5022 if (dst) 5023 bcopy(&ddst, dst, sizeof(*dst)); 5024 if (src) 5025 bcopy(&ssrc, src, sizeof(*src)); 5026 } 5027 5028 #ifdef IPV6CP_MYIFID_DYN 5029 /* 5030 * Generate random ifid. 5031 */ 5032 static void 5033 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 5034 { 5035 /* TBD */ 5036 } 5037 5038 /* 5039 * Set my IPv6 address. Must be called at splimp. 5040 */ 5041 static void 5042 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 5043 { 5044 STDDCL; 5045 struct ifaddr_container *ifac; 5046 struct ifaddr *ifa; 5047 struct sockaddr_in6 *sin6; 5048 5049 /* 5050 * Pick the first link-local AF_INET6 address from the list, 5051 * aliases don't make any sense on a p2p link anyway. 5052 */ 5053 5054 sin6 = NULL; 5055 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 5056 ifa = ifac->ifa; 5057 if (ifa->ifa_addr->sa_family == AF_INET6) { 5058 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 5059 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 5060 break; 5061 } 5062 } 5063 5064 if (ifac != NULL && sin6 != NULL) { 5065 int error; 5066 struct sockaddr_in6 new_sin6 = *sin6; 5067 5068 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 5069 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 5070 if (debug && error) { 5071 log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit " 5072 " failed, error=%d\n", SPP_ARGS(ifp), error); 5073 } 5074 } 5075 } 5076 #endif 5077 5078 /* 5079 * Suggest a candidate address to be used by peer. 5080 */ 5081 static void 5082 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 5083 { 5084 struct in6_addr myaddr; 5085 struct timeval tv; 5086 5087 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 5088 5089 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 5090 microtime(&tv); 5091 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 5092 myaddr.s6_addr[14] ^= 0xff; 5093 myaddr.s6_addr[15] ^= 0xff; 5094 } else { 5095 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 5096 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 5097 } 5098 if (suggest) 5099 bcopy(&myaddr, suggest, sizeof(myaddr)); 5100 } 5101 #endif /*INET6*/ 5102 5103 static int 5104 sppp_params(struct sppp *sp, u_long cmd, void *data) 5105 { 5106 u_long subcmd; 5107 struct ifreq *ifr = (struct ifreq *)data; 5108 struct spppreq *spr; 5109 int rv = 0; 5110 5111 spr = kmalloc(sizeof(struct spppreq), M_TEMP, M_INTWAIT); 5112 5113 /* 5114 * ifr->ifr_data is supposed to point to a struct spppreq. 5115 * Check the cmd word first before attempting to fetch all the 5116 * data. 5117 */ 5118 if ((subcmd = fuword(ifr->ifr_data)) == -1) { 5119 rv = EFAULT; 5120 goto quit; 5121 } 5122 5123 if (copyin((caddr_t)ifr->ifr_data, spr, sizeof(struct spppreq)) != 0) { 5124 rv = EFAULT; 5125 goto quit; 5126 } 5127 5128 switch (subcmd) { 5129 case (int)SPPPIOGDEFS: 5130 if (cmd != SIOCGIFGENERIC) { 5131 rv = EINVAL; 5132 break; 5133 } 5134 /* 5135 * We copy over the entire current state, but clean 5136 * out some of the stuff we don't wanna pass up. 5137 * Remember, SIOCGIFGENERIC is unprotected, and can be 5138 * called by any user. No need to ever get PAP or 5139 * CHAP secrets back to userland anyway. 5140 */ 5141 spr->defs.pp_phase = sp->pp_phase; 5142 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0; 5143 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0; 5144 spr->defs.lcp = sp->lcp; 5145 spr->defs.ipcp = sp->ipcp; 5146 spr->defs.ipv6cp = sp->ipv6cp; 5147 spr->defs.myauth = sp->myauth; 5148 spr->defs.hisauth = sp->hisauth; 5149 bzero(spr->defs.myauth.secret, AUTHKEYLEN); 5150 bzero(spr->defs.myauth.challenge, AUTHKEYLEN); 5151 bzero(spr->defs.hisauth.secret, AUTHKEYLEN); 5152 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN); 5153 /* 5154 * Fixup the LCP timeout value to milliseconds so 5155 * spppcontrol doesn't need to bother about the value 5156 * of "hz". We do the reverse calculation below when 5157 * setting it. 5158 */ 5159 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz; 5160 rv = copyout(spr, (caddr_t)ifr->ifr_data, 5161 sizeof(struct spppreq)); 5162 break; 5163 5164 case (int)SPPPIOSDEFS: 5165 if (cmd != SIOCSIFGENERIC) { 5166 rv = EINVAL; 5167 break; 5168 } 5169 /* 5170 * We have a very specific idea of which fields we 5171 * allow being passed back from userland, so to not 5172 * clobber our current state. For one, we only allow 5173 * setting anything if LCP is in dead or establish 5174 * phase. Once the authentication negotiations 5175 * started, the authentication settings must not be 5176 * changed again. (The administrator can force an 5177 * ifconfig down in order to get LCP back into dead 5178 * phase.) 5179 * 5180 * Also, we only allow for authentication parameters to be 5181 * specified. 5182 * 5183 * XXX Should allow to set or clear pp_flags. 5184 * 5185 * Finally, if the respective authentication protocol to 5186 * be used is set differently than 0, but the secret is 5187 * passed as all zeros, we don't trash the existing secret. 5188 * This allows an administrator to change the system name 5189 * only without clobbering the secret (which he didn't get 5190 * back in a previous SPPPIOGDEFS call). However, the 5191 * secrets are cleared if the authentication protocol is 5192 * reset to 0. */ 5193 if (sp->pp_phase != PHASE_DEAD && 5194 sp->pp_phase != PHASE_ESTABLISH) { 5195 rv = EBUSY; 5196 break; 5197 } 5198 5199 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP && 5200 spr->defs.myauth.proto != PPP_CHAP) || 5201 (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP && 5202 spr->defs.hisauth.proto != PPP_CHAP)) { 5203 rv = EINVAL; 5204 break; 5205 } 5206 5207 if (spr->defs.myauth.proto == 0) 5208 /* resetting myauth */ 5209 bzero(&sp->myauth, sizeof sp->myauth); 5210 else { 5211 /* setting/changing myauth */ 5212 sp->myauth.proto = spr->defs.myauth.proto; 5213 bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN); 5214 if (spr->defs.myauth.secret[0] != '\0') 5215 bcopy(spr->defs.myauth.secret, sp->myauth.secret, 5216 AUTHKEYLEN); 5217 } 5218 if (spr->defs.hisauth.proto == 0) 5219 /* resetting hisauth */ 5220 bzero(&sp->hisauth, sizeof sp->hisauth); 5221 else { 5222 /* setting/changing hisauth */ 5223 sp->hisauth.proto = spr->defs.hisauth.proto; 5224 sp->hisauth.flags = spr->defs.hisauth.flags; 5225 bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN); 5226 if (spr->defs.hisauth.secret[0] != '\0') 5227 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret, 5228 AUTHKEYLEN); 5229 } 5230 /* set LCP restart timer timeout */ 5231 if (spr->defs.lcp.timeout != 0) 5232 sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000; 5233 /* set VJ enable and IPv6 disable flags */ 5234 #ifdef INET 5235 if (spr->defs.enable_vj) 5236 sp->confflags |= CONF_ENABLE_VJ; 5237 else 5238 sp->confflags &= ~CONF_ENABLE_VJ; 5239 #endif 5240 #ifdef INET6 5241 if (spr->defs.enable_ipv6) 5242 sp->confflags |= CONF_ENABLE_IPV6; 5243 else 5244 sp->confflags &= ~CONF_ENABLE_IPV6; 5245 #endif 5246 break; 5247 5248 default: 5249 rv = EINVAL; 5250 } 5251 5252 quit: 5253 kfree(spr, M_TEMP); 5254 5255 return (rv); 5256 } 5257 5258 static void 5259 sppp_phase_network(struct sppp *sp) 5260 { 5261 STDDCL; 5262 int i; 5263 u_long mask; 5264 5265 sp->pp_phase = PHASE_NETWORK; 5266 5267 if (debug) 5268 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 5269 sppp_phase_name(sp->pp_phase)); 5270 5271 /* Notify NCPs now. */ 5272 for (i = 0; i < IDX_COUNT; i++) 5273 if ((cps[i])->flags & CP_NCP) 5274 (cps[i])->Open(sp); 5275 5276 /* Send Up events to all NCPs. */ 5277 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 5278 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP)) 5279 (cps[i])->Up(sp); 5280 5281 /* if no NCP is starting, all this was in vain, close down */ 5282 sppp_lcp_check_and_close(sp); 5283 } 5284 5285 5286 static const char * 5287 sppp_cp_type_name(u_char type) 5288 { 5289 static char buf[12]; 5290 switch (type) { 5291 case CONF_REQ: return "conf-req"; 5292 case CONF_ACK: return "conf-ack"; 5293 case CONF_NAK: return "conf-nak"; 5294 case CONF_REJ: return "conf-rej"; 5295 case TERM_REQ: return "term-req"; 5296 case TERM_ACK: return "term-ack"; 5297 case CODE_REJ: return "code-rej"; 5298 case PROTO_REJ: return "proto-rej"; 5299 case ECHO_REQ: return "echo-req"; 5300 case ECHO_REPLY: return "echo-reply"; 5301 case DISC_REQ: return "discard-req"; 5302 } 5303 ksnprintf (buf, sizeof(buf), "cp/0x%x", type); 5304 return buf; 5305 } 5306 5307 static const char * 5308 sppp_auth_type_name(u_short proto, u_char type) 5309 { 5310 static char buf[12]; 5311 switch (proto) { 5312 case PPP_CHAP: 5313 switch (type) { 5314 case CHAP_CHALLENGE: return "challenge"; 5315 case CHAP_RESPONSE: return "response"; 5316 case CHAP_SUCCESS: return "success"; 5317 case CHAP_FAILURE: return "failure"; 5318 } 5319 case PPP_PAP: 5320 switch (type) { 5321 case PAP_REQ: return "req"; 5322 case PAP_ACK: return "ack"; 5323 case PAP_NAK: return "nak"; 5324 } 5325 } 5326 ksnprintf (buf, sizeof(buf), "auth/0x%x", type); 5327 return buf; 5328 } 5329 5330 static const char * 5331 sppp_lcp_opt_name(u_char opt) 5332 { 5333 static char buf[12]; 5334 switch (opt) { 5335 case LCP_OPT_MRU: return "mru"; 5336 case LCP_OPT_ASYNC_MAP: return "async-map"; 5337 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 5338 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 5339 case LCP_OPT_MAGIC: return "magic"; 5340 case LCP_OPT_PROTO_COMP: return "proto-comp"; 5341 case LCP_OPT_ADDR_COMP: return "addr-comp"; 5342 } 5343 ksnprintf (buf, sizeof(buf), "lcp/0x%x", opt); 5344 return buf; 5345 } 5346 5347 static const char * 5348 sppp_ipcp_opt_name(u_char opt) 5349 { 5350 static char buf[12]; 5351 switch (opt) { 5352 case IPCP_OPT_ADDRESSES: return "addresses"; 5353 case IPCP_OPT_COMPRESSION: return "compression"; 5354 case IPCP_OPT_ADDRESS: return "address"; 5355 } 5356 ksnprintf (buf, sizeof(buf), "ipcp/0x%x", opt); 5357 return buf; 5358 } 5359 5360 #ifdef INET6 5361 static const char * 5362 sppp_ipv6cp_opt_name(u_char opt) 5363 { 5364 static char buf[12]; 5365 switch (opt) { 5366 case IPV6CP_OPT_IFID: return "ifid"; 5367 case IPV6CP_OPT_COMPRESSION: return "compression"; 5368 } 5369 ksprintf (buf, "0x%x", opt); 5370 return buf; 5371 } 5372 #endif 5373 5374 static const char * 5375 sppp_state_name(int state) 5376 { 5377 switch (state) { 5378 case STATE_INITIAL: return "initial"; 5379 case STATE_STARTING: return "starting"; 5380 case STATE_CLOSED: return "closed"; 5381 case STATE_STOPPED: return "stopped"; 5382 case STATE_CLOSING: return "closing"; 5383 case STATE_STOPPING: return "stopping"; 5384 case STATE_REQ_SENT: return "req-sent"; 5385 case STATE_ACK_RCVD: return "ack-rcvd"; 5386 case STATE_ACK_SENT: return "ack-sent"; 5387 case STATE_OPENED: return "opened"; 5388 } 5389 return "illegal"; 5390 } 5391 5392 static const char * 5393 sppp_phase_name(enum ppp_phase phase) 5394 { 5395 switch (phase) { 5396 case PHASE_DEAD: return "dead"; 5397 case PHASE_ESTABLISH: return "establish"; 5398 case PHASE_TERMINATE: return "terminate"; 5399 case PHASE_AUTHENTICATE: return "authenticate"; 5400 case PHASE_NETWORK: return "network"; 5401 } 5402 return "illegal"; 5403 } 5404 5405 static const char * 5406 sppp_proto_name(u_short proto) 5407 { 5408 static char buf[12]; 5409 switch (proto) { 5410 case PPP_LCP: return "lcp"; 5411 case PPP_IPCP: return "ipcp"; 5412 case PPP_PAP: return "pap"; 5413 case PPP_CHAP: return "chap"; 5414 case PPP_IPV6CP: return "ipv6cp"; 5415 } 5416 ksnprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto); 5417 return buf; 5418 } 5419 5420 static void 5421 sppp_print_bytes(const u_char *p, u_short len) 5422 { 5423 if (len) 5424 log(-1, " %*D", len, p, "-"); 5425 } 5426 5427 static void 5428 sppp_print_string(const char *p, u_short len) 5429 { 5430 u_char c; 5431 5432 while (len-- > 0) { 5433 c = *p++; 5434 /* 5435 * Print only ASCII chars directly. RFC 1994 recommends 5436 * using only them, but we don't rely on it. */ 5437 if (c < ' ' || c > '~') 5438 log(-1, "\\x%x", c); 5439 else 5440 log(-1, "%c", c); 5441 } 5442 } 5443 5444 static const char * 5445 sppp_dotted_quad(u_long addr) 5446 { 5447 static char s[16]; 5448 ksprintf(s, "%d.%d.%d.%d", 5449 (int)((addr >> 24) & 0xff), 5450 (int)((addr >> 16) & 0xff), 5451 (int)((addr >> 8) & 0xff), 5452 (int)(addr & 0xff)); 5453 return s; 5454 } 5455 5456 static int 5457 sppp_strnlen(u_char *p, int max) 5458 { 5459 int len; 5460 5461 for (len = 0; len < max && *p; ++p) 5462 ++len; 5463 return len; 5464 } 5465 5466 /* a dummy, used to drop uninteresting events */ 5467 static void 5468 sppp_null(struct sppp *unused) 5469 { 5470 /* do just nothing */ 5471 } 5472