if_spppsubr.c revision 78250
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, 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: head/sys/net/if_spppsubr.c 78250 2001-06-15 07:33:09Z peter $ 21 */ 22 23#include <sys/param.h> 24 25#if defined(__FreeBSD__) && __FreeBSD__ >= 3 26#include "opt_inet.h" 27#include "opt_inet6.h" 28#include "opt_ipx.h" 29#endif 30 31#ifdef NetBSD1_3 32# if NetBSD1_3 > 6 33# include "opt_inet.h" 34# include "opt_inet6.h" 35# include "opt_iso.h" 36# endif 37#endif 38 39#include <sys/systm.h> 40#include <sys/kernel.h> 41#include <sys/module.h> 42#include <sys/sockio.h> 43#include <sys/socket.h> 44#include <sys/syslog.h> 45#if defined(__FreeBSD__) && __FreeBSD__ >= 3 46#include <sys/random.h> 47#endif 48#include <sys/malloc.h> 49#include <sys/mbuf.h> 50 51#if defined (__OpenBSD__) 52#include <sys/md5k.h> 53#else 54#include <sys/md5.h> 55#endif 56 57#include <net/if.h> 58#include <net/netisr.h> 59#include <net/if_types.h> 60#include <net/route.h> 61 62#if defined (__NetBSD__) || defined (__OpenBSD__) 63#include <machine/cpu.h> /* XXX for softnet */ 64#endif 65 66#include <machine/stdarg.h> 67 68#ifdef INET 69#include <netinet/in.h> 70#include <netinet/in_systm.h> 71#include <netinet/in_var.h> 72#include <netinet/ip.h> 73#include <netinet/tcp.h> 74# if defined (__FreeBSD__) || defined (__OpenBSD__) 75# include <netinet/if_ether.h> 76# else 77# include <net/ethertypes.h> 78# endif 79#else 80# error Huh? sppp without INET? 81#endif 82 83#ifdef IPX 84#include <netipx/ipx.h> 85#include <netipx/ipx_if.h> 86#endif 87 88#ifdef NS 89#include <netns/ns.h> 90#include <netns/ns_if.h> 91#endif 92 93#include <net/if_sppp.h> 94 95#if defined(__FreeBSD__) && __FreeBSD__ >= 3 96# define UNTIMEOUT(fun, arg, handle) untimeout(fun, arg, handle) 97# define TIMEOUT(fun, arg1, arg2, handle) handle = timeout(fun, arg1, arg2) 98# define IOCTL_CMD_T u_long 99#else 100# define UNTIMEOUT(fun, arg, handle) untimeout(fun, arg) 101# define TIMEOUT(fun, arg1, arg2, handle) timeout(fun, arg1, arg2) 102# define IOCTL_CMD_T int 103#endif 104 105#define MAXALIVECNT 3 /* max. alive packets */ 106 107/* 108 * Interface flags that can be set in an ifconfig command. 109 * 110 * Setting link0 will make the link passive, i.e. it will be marked 111 * as being administrative openable, but won't be opened to begin 112 * with. Incoming calls will be answered, or subsequent calls with 113 * -link1 will cause the administrative open of the LCP layer. 114 * 115 * Setting link1 will cause the link to auto-dial only as packets 116 * arrive to be sent. 117 * 118 * Setting IFF_DEBUG will syslog the option negotiation and state 119 * transitions at level kern.debug. Note: all logs consistently look 120 * like 121 * 122 * <if-name><unit>: <proto-name> <additional info...> 123 * 124 * with <if-name><unit> being something like "bppp0", and <proto-name> 125 * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc. 126 */ 127 128#define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */ 129#define IFF_AUTO IFF_LINK1 /* auto-dial on output */ 130#define IFF_CISCO IFF_LINK2 /* auto-dial on output */ 131 132#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */ 133#define PPP_UI 0x03 /* Unnumbered Information */ 134#define PPP_IP 0x0021 /* Internet Protocol */ 135#define PPP_ISO 0x0023 /* ISO OSI Protocol */ 136#define PPP_XNS 0x0025 /* Xerox NS Protocol */ 137#define PPP_IPX 0x002b /* Novell IPX Protocol */ 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 PAP_REQ 1 /* PAP name/password request */ 174#define PAP_ACK 2 /* PAP acknowledge */ 175#define PAP_NAK 3 /* PAP fail */ 176 177#define CHAP_CHALLENGE 1 /* CHAP challenge request */ 178#define CHAP_RESPONSE 2 /* CHAP challenge response */ 179#define CHAP_SUCCESS 3 /* CHAP response ok */ 180#define CHAP_FAILURE 4 /* CHAP response failed */ 181 182#define CHAP_MD5 5 /* hash algorithm - MD5 */ 183 184#define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 185#define CISCO_UNICAST 0x0f /* Cisco unicast address */ 186#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 187#define CISCO_ADDR_REQ 0 /* Cisco address request */ 188#define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 189#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 190 191/* states are named and numbered according to RFC 1661 */ 192#define STATE_INITIAL 0 193#define STATE_STARTING 1 194#define STATE_CLOSED 2 195#define STATE_STOPPED 3 196#define STATE_CLOSING 4 197#define STATE_STOPPING 5 198#define STATE_REQ_SENT 6 199#define STATE_ACK_RCVD 7 200#define STATE_ACK_SENT 8 201#define STATE_OPENED 9 202 203struct ppp_header { 204 u_char address; 205 u_char control; 206 u_short protocol; 207}; 208#define PPP_HEADER_LEN sizeof (struct ppp_header) 209 210struct lcp_header { 211 u_char type; 212 u_char ident; 213 u_short len; 214}; 215#define LCP_HEADER_LEN sizeof (struct lcp_header) 216 217struct cisco_packet { 218 u_long type; 219 u_long par1; 220 u_long par2; 221 u_short rel; 222 u_short time0; 223 u_short time1; 224}; 225#define CISCO_PACKET_LEN 18 226 227/* 228 * We follow the spelling and capitalization of RFC 1661 here, to make 229 * it easier comparing with the standard. Please refer to this RFC in 230 * case you can't make sense out of these abbreviation; it will also 231 * explain the semantics related to the various events and actions. 232 */ 233struct cp { 234 u_short proto; /* PPP control protocol number */ 235 u_char protoidx; /* index into state table in struct sppp */ 236 u_char flags; 237#define CP_LCP 0x01 /* this is the LCP */ 238#define CP_AUTH 0x02 /* this is an authentication protocol */ 239#define CP_NCP 0x04 /* this is a NCP */ 240#define CP_QUAL 0x08 /* this is a quality reporting protocol */ 241 const char *name; /* name of this control protocol */ 242 /* event handlers */ 243 void (*Up)(struct sppp *sp); 244 void (*Down)(struct sppp *sp); 245 void (*Open)(struct sppp *sp); 246 void (*Close)(struct sppp *sp); 247 void (*TO)(void *sp); 248 int (*RCR)(struct sppp *sp, struct lcp_header *h, int len); 249 void (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len); 250 void (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len); 251 /* actions */ 252 void (*tlu)(struct sppp *sp); 253 void (*tld)(struct sppp *sp); 254 void (*tls)(struct sppp *sp); 255 void (*tlf)(struct sppp *sp); 256 void (*scr)(struct sppp *sp); 257}; 258 259static struct sppp *spppq; 260#if defined(__FreeBSD__) && __FreeBSD__ >= 3 261static struct callout_handle keepalive_ch; 262#endif 263 264#if defined(__FreeBSD__) && __FreeBSD__ >= 3 265#define SPP_FMT "%s%d: " 266#define SPP_ARGS(ifp) (ifp)->if_name, (ifp)->if_unit 267#else 268#define SPP_FMT "%s: " 269#define SPP_ARGS(ifp) (ifp)->if_xname 270#endif 271 272/* 273 * The following disgusting hack gets around the problem that IP TOS 274 * can't be set yet. We want to put "interactive" traffic on a high 275 * priority queue. To decide if traffic is interactive, we check that 276 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control. 277 * 278 * XXX is this really still necessary? - joerg - 279 */ 280static u_short interactive_ports[8] = { 281 0, 513, 0, 0, 282 0, 21, 0, 23, 283}; 284#define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p)) 285 286/* almost every function needs these */ 287#define STDDCL \ 288 struct ifnet *ifp = &sp->pp_if; \ 289 int debug = ifp->if_flags & IFF_DEBUG 290 291static int sppp_output(struct ifnet *ifp, struct mbuf *m, 292 struct sockaddr *dst, struct rtentry *rt); 293 294static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2); 295static void sppp_cisco_input(struct sppp *sp, struct mbuf *m); 296 297static void sppp_cp_input(const struct cp *cp, struct sppp *sp, 298 struct mbuf *m); 299static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 300 u_char ident, u_short len, void *data); 301/* static void sppp_cp_timeout(void *arg); */ 302static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp, 303 int newstate); 304static void sppp_auth_send(const struct cp *cp, 305 struct sppp *sp, unsigned int type, unsigned int id, 306 ...); 307 308static void sppp_up_event(const struct cp *cp, struct sppp *sp); 309static void sppp_down_event(const struct cp *cp, struct sppp *sp); 310static void sppp_open_event(const struct cp *cp, struct sppp *sp); 311static void sppp_close_event(const struct cp *cp, struct sppp *sp); 312static void sppp_to_event(const struct cp *cp, struct sppp *sp); 313 314static void sppp_null(struct sppp *sp); 315 316static void sppp_lcp_init(struct sppp *sp); 317static void sppp_lcp_up(struct sppp *sp); 318static void sppp_lcp_down(struct sppp *sp); 319static void sppp_lcp_open(struct sppp *sp); 320static void sppp_lcp_close(struct sppp *sp); 321static void sppp_lcp_TO(void *sp); 322static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 323static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 324static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 325static void sppp_lcp_tlu(struct sppp *sp); 326static void sppp_lcp_tld(struct sppp *sp); 327static void sppp_lcp_tls(struct sppp *sp); 328static void sppp_lcp_tlf(struct sppp *sp); 329static void sppp_lcp_scr(struct sppp *sp); 330static void sppp_lcp_check_and_close(struct sppp *sp); 331static int sppp_ncp_check(struct sppp *sp); 332 333static void sppp_ipcp_init(struct sppp *sp); 334static void sppp_ipcp_up(struct sppp *sp); 335static void sppp_ipcp_down(struct sppp *sp); 336static void sppp_ipcp_open(struct sppp *sp); 337static void sppp_ipcp_close(struct sppp *sp); 338static void sppp_ipcp_TO(void *sp); 339static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len); 340static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 341static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 342static void sppp_ipcp_tlu(struct sppp *sp); 343static void sppp_ipcp_tld(struct sppp *sp); 344static void sppp_ipcp_tls(struct sppp *sp); 345static void sppp_ipcp_tlf(struct sppp *sp); 346static void sppp_ipcp_scr(struct sppp *sp); 347 348static void sppp_ipv6cp_init(struct sppp *sp); 349static void sppp_ipv6cp_up(struct sppp *sp); 350static void sppp_ipv6cp_down(struct sppp *sp); 351static void sppp_ipv6cp_open(struct sppp *sp); 352static void sppp_ipv6cp_close(struct sppp *sp); 353static void sppp_ipv6cp_TO(void *sp); 354static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len); 355static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len); 356static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len); 357static void sppp_ipv6cp_tlu(struct sppp *sp); 358static void sppp_ipv6cp_tld(struct sppp *sp); 359static void sppp_ipv6cp_tls(struct sppp *sp); 360static void sppp_ipv6cp_tlf(struct sppp *sp); 361static void sppp_ipv6cp_scr(struct sppp *sp); 362 363static void sppp_pap_input(struct sppp *sp, struct mbuf *m); 364static void sppp_pap_init(struct sppp *sp); 365static void sppp_pap_open(struct sppp *sp); 366static void sppp_pap_close(struct sppp *sp); 367static void sppp_pap_TO(void *sp); 368static void sppp_pap_my_TO(void *sp); 369static void sppp_pap_tlu(struct sppp *sp); 370static void sppp_pap_tld(struct sppp *sp); 371static void sppp_pap_scr(struct sppp *sp); 372 373static void sppp_chap_input(struct sppp *sp, struct mbuf *m); 374static void sppp_chap_init(struct sppp *sp); 375static void sppp_chap_open(struct sppp *sp); 376static void sppp_chap_close(struct sppp *sp); 377static void sppp_chap_TO(void *sp); 378static void sppp_chap_tlu(struct sppp *sp); 379static void sppp_chap_tld(struct sppp *sp); 380static void sppp_chap_scr(struct sppp *sp); 381 382static const char *sppp_auth_type_name(u_short proto, u_char type); 383static const char *sppp_cp_type_name(u_char type); 384static const char *sppp_dotted_quad(u_long addr); 385static const char *sppp_ipcp_opt_name(u_char opt); 386#ifdef INET6 387static const char *sppp_ipv6cp_opt_name(u_char opt); 388#endif 389static const char *sppp_lcp_opt_name(u_char opt); 390static const char *sppp_phase_name(enum ppp_phase phase); 391static const char *sppp_proto_name(u_short proto); 392static const char *sppp_state_name(int state); 393static int sppp_params(struct sppp *sp, u_long cmd, void *data); 394static int sppp_strnlen(u_char *p, int max); 395static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, 396 u_long *srcmask); 397static void sppp_keepalive(void *dummy); 398static void sppp_phase_network(struct sppp *sp); 399static void sppp_print_bytes(const u_char *p, u_short len); 400static void sppp_print_string(const char *p, u_short len); 401static void sppp_qflush(struct ifqueue *ifq); 402static void sppp_set_ip_addr(struct sppp *sp, u_long src); 403#ifdef INET6 404static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, 405 struct in6_addr *dst, struct in6_addr *srcmask); 406#ifdef IPV6CP_MYIFID_DYN 407static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src); 408static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src); 409#endif 410static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src); 411#endif 412 413/* our control protocol descriptors */ 414static const struct cp lcp = { 415 PPP_LCP, IDX_LCP, CP_LCP, "lcp", 416 sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close, 417 sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak, 418 sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf, 419 sppp_lcp_scr 420}; 421 422static const struct cp ipcp = { 423 PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp", 424 sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close, 425 sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak, 426 sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf, 427 sppp_ipcp_scr 428}; 429 430static const struct cp ipv6cp = { 431 PPP_IPV6CP, IDX_IPV6CP, 432#ifdef INET6 /*don't run IPv6CP if there's no IPv6 support*/ 433 CP_NCP, 434#else 435 0, 436#endif 437 "ipv6cp", 438 sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close, 439 sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak, 440 sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf, 441 sppp_ipv6cp_scr 442}; 443 444static const struct cp pap = { 445 PPP_PAP, IDX_PAP, CP_AUTH, "pap", 446 sppp_null, sppp_null, sppp_pap_open, sppp_pap_close, 447 sppp_pap_TO, 0, 0, 0, 448 sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null, 449 sppp_pap_scr 450}; 451 452static const struct cp chap = { 453 PPP_CHAP, IDX_CHAP, CP_AUTH, "chap", 454 sppp_null, sppp_null, sppp_chap_open, sppp_chap_close, 455 sppp_chap_TO, 0, 0, 0, 456 sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null, 457 sppp_chap_scr 458}; 459 460static const struct cp *cps[IDX_COUNT] = { 461 &lcp, /* IDX_LCP */ 462 &ipcp, /* IDX_IPCP */ 463 &ipv6cp, /* IDX_IPV6CP */ 464 &pap, /* IDX_PAP */ 465 &chap, /* IDX_CHAP */ 466}; 467 468static int 469sppp_modevent(module_t mod, int type, void *unused) 470{ 471 switch (type) { 472 case MOD_LOAD: 473 break; 474 case MOD_UNLOAD: 475 return EACCES; 476 break; 477 default: 478 break; 479 } 480 return 0; 481} 482static moduledata_t spppmod = { 483 "sppp", 484 sppp_modevent, 485 0 486}; 487MODULE_VERSION(sppp, 1); 488DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY); 489 490/* 491 * Exported functions, comprising our interface to the lower layer. 492 */ 493 494/* 495 * Process the received packet. 496 */ 497void 498sppp_input(struct ifnet *ifp, struct mbuf *m) 499{ 500 struct ppp_header *h; 501 struct ifqueue *inq = 0; 502 struct sppp *sp = (struct sppp *)ifp; 503 int debug = ifp->if_flags & IFF_DEBUG; 504 505 if (ifp->if_flags & IFF_UP) 506 /* Count received bytes, add FCS and one flag */ 507 ifp->if_ibytes += m->m_pkthdr.len + 3; 508 509 if (m->m_pkthdr.len <= PPP_HEADER_LEN) { 510 /* Too small packet, drop it. */ 511 if (debug) 512 log(LOG_DEBUG, 513 SPP_FMT "input packet is too small, %d bytes\n", 514 SPP_ARGS(ifp), m->m_pkthdr.len); 515 drop: 516 ++ifp->if_ierrors; 517 ++ifp->if_iqdrops; 518 m_freem (m); 519 return; 520 } 521 522 /* Get PPP header. */ 523 h = mtod (m, struct ppp_header*); 524 m_adj (m, PPP_HEADER_LEN); 525 526 switch (h->address) { 527 case PPP_ALLSTATIONS: 528 if (h->control != PPP_UI) 529 goto invalid; 530 if (sp->pp_mode == IFF_CISCO) { 531 if (debug) 532 log(LOG_DEBUG, 533 SPP_FMT "PPP packet in Cisco mode " 534 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 535 SPP_ARGS(ifp), 536 h->address, h->control, ntohs(h->protocol)); 537 goto drop; 538 } 539 switch (ntohs (h->protocol)) { 540 default: 541 if (debug) 542 log(LOG_DEBUG, 543 SPP_FMT "rejecting protocol " 544 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 545 SPP_ARGS(ifp), 546 h->address, h->control, ntohs(h->protocol)); 547 if (sp->state[IDX_LCP] == STATE_OPENED) 548 sppp_cp_send (sp, PPP_LCP, PROTO_REJ, 549 ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2, 550 &h->protocol); 551 ++ifp->if_noproto; 552 goto drop; 553 case PPP_LCP: 554 sppp_cp_input(&lcp, sp, m); 555 m_freem (m); 556 return; 557 case PPP_PAP: 558 if (sp->pp_phase >= PHASE_AUTHENTICATE) 559 sppp_pap_input(sp, m); 560 m_freem (m); 561 return; 562 case PPP_CHAP: 563 if (sp->pp_phase >= PHASE_AUTHENTICATE) 564 sppp_chap_input(sp, m); 565 m_freem (m); 566 return; 567#ifdef INET 568 case PPP_IPCP: 569 if (sp->pp_phase == PHASE_NETWORK) 570 sppp_cp_input(&ipcp, sp, m); 571 m_freem (m); 572 return; 573 case PPP_IP: 574 if (sp->state[IDX_IPCP] == STATE_OPENED) { 575 schednetisr (NETISR_IP); 576 inq = &ipintrq; 577 } 578 break; 579#endif 580#ifdef INET6 581 case PPP_IPV6CP: 582 if (sp->pp_phase == PHASE_NETWORK) 583 sppp_cp_input(&ipv6cp, sp, m); 584 m_freem (m); 585 return; 586 587 case PPP_IPV6: 588 if (sp->state[IDX_IPV6CP] == STATE_OPENED) { 589 schednetisr (NETISR_IPV6); 590 inq = &ip6intrq; 591 } 592 break; 593#endif 594#ifdef IPX 595 case PPP_IPX: 596 /* IPX IPXCP not implemented yet */ 597 if (sp->pp_phase == PHASE_NETWORK) { 598 schednetisr (NETISR_IPX); 599 inq = &ipxintrq; 600 } 601 break; 602#endif 603#ifdef NS 604 case PPP_XNS: 605 /* XNS IDPCP not implemented yet */ 606 if (sp->pp_phase == PHASE_NETWORK) { 607 schednetisr (NETISR_NS); 608 inq = &nsintrq; 609 } 610 break; 611#endif 612 } 613 break; 614 case CISCO_MULTICAST: 615 case CISCO_UNICAST: 616 /* Don't check the control field here (RFC 1547). */ 617 if (sp->pp_mode != IFF_CISCO) { 618 if (debug) 619 log(LOG_DEBUG, 620 SPP_FMT "Cisco packet in PPP mode " 621 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 622 SPP_ARGS(ifp), 623 h->address, h->control, ntohs(h->protocol)); 624 goto drop; 625 } 626 switch (ntohs (h->protocol)) { 627 default: 628 ++ifp->if_noproto; 629 goto invalid; 630 case CISCO_KEEPALIVE: 631 sppp_cisco_input ((struct sppp*) ifp, m); 632 m_freem (m); 633 return; 634#ifdef INET 635 case ETHERTYPE_IP: 636 schednetisr (NETISR_IP); 637 inq = &ipintrq; 638 break; 639#endif 640#ifdef INET6 641 case ETHERTYPE_IPV6: 642 schednetisr (NETISR_IPV6); 643 inq = &ip6intrq; 644 break; 645#endif 646#ifdef IPX 647 case ETHERTYPE_IPX: 648 schednetisr (NETISR_IPX); 649 inq = &ipxintrq; 650 break; 651#endif 652#ifdef NS 653 case ETHERTYPE_NS: 654 schednetisr (NETISR_NS); 655 inq = &nsintrq; 656 break; 657#endif 658 } 659 break; 660 default: /* Invalid PPP packet. */ 661 invalid: 662 if (debug) 663 log(LOG_DEBUG, 664 SPP_FMT "invalid input packet " 665 "<addr=0x%x ctrl=0x%x proto=0x%x>\n", 666 SPP_ARGS(ifp), 667 h->address, h->control, ntohs(h->protocol)); 668 goto drop; 669 } 670 671 if (! (ifp->if_flags & IFF_UP) || ! inq) 672 goto drop; 673 674 /* Check queue. */ 675 if (! IF_HANDOFF(inq, m, NULL)) { 676 if (debug) 677 log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n", 678 SPP_ARGS(ifp)); 679 goto drop; 680 } 681} 682 683/* 684 * Enqueue transmit packet. 685 */ 686static int 687sppp_output(struct ifnet *ifp, struct mbuf *m, 688 struct sockaddr *dst, struct rtentry *rt) 689{ 690 struct sppp *sp = (struct sppp*) ifp; 691 struct ppp_header *h; 692 struct ifqueue *ifq = NULL; 693 int s, rv = 0; 694 int debug = ifp->if_flags & IFF_DEBUG; 695 696 s = splimp(); 697 698 if ((ifp->if_flags & IFF_UP) == 0 || 699 (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) { 700 m_freem (m); 701 splx (s); 702 return (ENETDOWN); 703 } 704 705 if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) { 706 /* 707 * Interface is not yet running, but auto-dial. Need 708 * to start LCP for it. 709 */ 710 ifp->if_flags |= IFF_RUNNING; 711 splx(s); 712 lcp.Open(sp); 713 s = splimp(); 714 } 715 716 ifq = &ifp->if_snd; 717#ifdef INET 718 if (dst->sa_family == AF_INET) { 719 /* XXX Check mbuf length here? */ 720 struct ip *ip = mtod (m, struct ip*); 721 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl); 722 723 /* 724 * When using dynamic local IP address assignment by using 725 * 0.0.0.0 as a local address, the first TCP session will 726 * not connect because the local TCP checksum is computed 727 * using 0.0.0.0 which will later become our real IP address 728 * so the TCP checksum computed at the remote end will 729 * become invalid. So we 730 * - don't let packets with src ip addr 0 thru 731 * - we flag TCP packets with src ip 0 as an error 732 */ 733 734 if(ip->ip_src.s_addr == INADDR_ANY) /* -hm */ 735 { 736 m_freem(m); 737 splx(s); 738 if(ip->ip_p == IPPROTO_TCP) 739 return(EADDRNOTAVAIL); 740 else 741 return(0); 742 } 743 744 /* 745 * Put low delay, telnet, rlogin and ftp control packets 746 * in front of the queue. 747 */ 748 if (_IF_QFULL(&sp->pp_fastq)) 749 ; 750 else if (ip->ip_tos & IPTOS_LOWDELAY) 751 ifq = &sp->pp_fastq; 752 else if (m->m_len < sizeof *ip + sizeof *tcp) 753 ; 754 else if (ip->ip_p != IPPROTO_TCP) 755 ; 756 else if (INTERACTIVE (ntohs (tcp->th_sport))) 757 ifq = &sp->pp_fastq; 758 else if (INTERACTIVE (ntohs (tcp->th_dport))) 759 ifq = &sp->pp_fastq; 760 } 761#endif 762 763#ifdef INET6 764 if (dst->sa_family == AF_INET6) { 765 /* XXX do something tricky here? */ 766 } 767#endif 768 769 /* 770 * Prepend general data packet PPP header. For now, IP only. 771 */ 772 M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT); 773 if (! m) { 774 if (debug) 775 log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n", 776 SPP_ARGS(ifp)); 777 ++ifp->if_oerrors; 778 splx (s); 779 return (ENOBUFS); 780 } 781 /* 782 * May want to check size of packet 783 * (albeit due to the implementation it's always enough) 784 */ 785 h = mtod (m, struct ppp_header*); 786 if (sp->pp_mode == IFF_CISCO) { 787 h->address = CISCO_UNICAST; /* unicast address */ 788 h->control = 0; 789 } else { 790 h->address = PPP_ALLSTATIONS; /* broadcast address */ 791 h->control = PPP_UI; /* Unnumbered Info */ 792 } 793 794 switch (dst->sa_family) { 795#ifdef INET 796 case AF_INET: /* Internet Protocol */ 797 if (sp->pp_mode == IFF_CISCO) 798 h->protocol = htons (ETHERTYPE_IP); 799 else { 800 /* 801 * Don't choke with an ENETDOWN early. It's 802 * possible that we just started dialing out, 803 * so don't drop the packet immediately. If 804 * we notice that we run out of buffer space 805 * below, we will however remember that we are 806 * not ready to carry IP packets, and return 807 * ENETDOWN, as opposed to ENOBUFS. 808 */ 809 h->protocol = htons(PPP_IP); 810 if (sp->state[IDX_IPCP] != STATE_OPENED) 811 rv = ENETDOWN; 812 } 813 break; 814#endif 815#ifdef INET6 816 case AF_INET6: /* Internet Protocol */ 817 if (sp->pp_mode == IFF_CISCO) 818 h->protocol = htons (ETHERTYPE_IPV6); 819 else { 820 /* 821 * Don't choke with an ENETDOWN early. It's 822 * possible that we just started dialing out, 823 * so don't drop the packet immediately. If 824 * we notice that we run out of buffer space 825 * below, we will however remember that we are 826 * not ready to carry IP packets, and return 827 * ENETDOWN, as opposed to ENOBUFS. 828 */ 829 h->protocol = htons(PPP_IPV6); 830 if (sp->state[IDX_IPV6CP] != STATE_OPENED) 831 rv = ENETDOWN; 832 } 833 break; 834#endif 835#ifdef NS 836 case AF_NS: /* Xerox NS Protocol */ 837 h->protocol = htons (sp->pp_mode == IFF_CISCO ? 838 ETHERTYPE_NS : PPP_XNS); 839 break; 840#endif 841#ifdef IPX 842 case AF_IPX: /* Novell IPX Protocol */ 843 h->protocol = htons (sp->pp_mode == IFF_CISCO ? 844 ETHERTYPE_IPX : PPP_IPX); 845 break; 846#endif 847 default: 848 m_freem (m); 849 ++ifp->if_oerrors; 850 splx (s); 851 return (EAFNOSUPPORT); 852 } 853 854 /* 855 * Queue message on interface, and start output if interface 856 * not yet active. Also adjust output byte count. 857 * The packet length includes header, FCS and 1 flag, 858 * according to RFC 1333. 859 */ 860 if (! IF_HANDOFF_ADJ(ifq, m, ifp, 3)) { 861 ++ifp->if_oerrors; 862 return (rv? rv: ENOBUFS); 863 } 864 return (0); 865} 866 867void 868sppp_attach(struct ifnet *ifp) 869{ 870 struct sppp *sp = (struct sppp*) ifp; 871 872 /* Initialize keepalive handler. */ 873 if (! spppq) 874 TIMEOUT(sppp_keepalive, 0, hz * 10, keepalive_ch); 875 876 /* Insert new entry into the keepalive list. */ 877 sp->pp_next = spppq; 878 spppq = sp; 879 880 sp->pp_if.if_mtu = PP_MTU; 881 sp->pp_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 882 sp->pp_if.if_type = IFT_PPP; 883 sp->pp_if.if_output = sppp_output; 884#if 0 885 sp->pp_flags = PP_KEEPALIVE; 886#endif 887 sp->pp_if.if_snd.ifq_maxlen = 32; 888 sp->pp_fastq.ifq_maxlen = 32; 889 sp->pp_cpq.ifq_maxlen = 20; 890 sp->pp_loopcnt = 0; 891 sp->pp_alivecnt = 0; 892 bzero(&sp->pp_seq[0], sizeof(sp->pp_seq)); 893 bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq)); 894 sp->pp_phase = PHASE_DEAD; 895 sp->pp_up = lcp.Up; 896 sp->pp_down = lcp.Down; 897 mtx_init(&sp->pp_cpq.ifq_mtx, "sppp_cpq", MTX_DEF); 898 mtx_init(&sp->pp_fastq.ifq_mtx, "sppp_fastq", MTX_DEF); 899 900 sppp_lcp_init(sp); 901 sppp_ipcp_init(sp); 902 sppp_ipv6cp_init(sp); 903 sppp_pap_init(sp); 904 sppp_chap_init(sp); 905} 906 907void 908sppp_detach(struct ifnet *ifp) 909{ 910 struct sppp **q, *p, *sp = (struct sppp*) ifp; 911 int i; 912 913 /* Remove the entry from the keepalive list. */ 914 for (q = &spppq; (p = *q); q = &p->pp_next) 915 if (p == sp) { 916 *q = p->pp_next; 917 break; 918 } 919 920 /* Stop keepalive handler. */ 921 if (! spppq) 922 UNTIMEOUT(sppp_keepalive, 0, keepalive_ch); 923 924 for (i = 0; i < IDX_COUNT; i++) 925 UNTIMEOUT((cps[i])->TO, (void *)sp, sp->ch[i]); 926 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 927 mtx_destroy(&sp->pp_cpq.ifq_mtx); 928 mtx_destroy(&sp->pp_fastq.ifq_mtx); 929} 930 931/* 932 * Flush the interface output queue. 933 */ 934void 935sppp_flush(struct ifnet *ifp) 936{ 937 struct sppp *sp = (struct sppp*) ifp; 938 939 sppp_qflush (&sp->pp_if.if_snd); 940 sppp_qflush (&sp->pp_fastq); 941 sppp_qflush (&sp->pp_cpq); 942} 943 944/* 945 * Check if the output queue is empty. 946 */ 947int 948sppp_isempty(struct ifnet *ifp) 949{ 950 struct sppp *sp = (struct sppp*) ifp; 951 int empty, s; 952 953 s = splimp(); 954 empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head && 955 !sp->pp_if.if_snd.ifq_head; 956 splx(s); 957 return (empty); 958} 959 960/* 961 * Get next packet to send. 962 */ 963struct mbuf * 964sppp_dequeue(struct ifnet *ifp) 965{ 966 struct sppp *sp = (struct sppp*) ifp; 967 struct mbuf *m; 968 int s; 969 970 s = splimp(); 971 /* 972 * Process only the control protocol queue until we have at 973 * least one NCP open. 974 * 975 * Do always serve all three queues in Cisco mode. 976 */ 977 IF_DEQUEUE(&sp->pp_cpq, m); 978 if (m == NULL && 979 (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO)) { 980 IF_DEQUEUE(&sp->pp_fastq, m); 981 if (m == NULL) 982 IF_DEQUEUE (&sp->pp_if.if_snd, m); 983 } 984 splx(s); 985 return m; 986} 987 988/* 989 * Pick the next packet, do not remove it from the queue. 990 */ 991struct mbuf * 992sppp_pick(struct ifnet *ifp) 993{ 994 struct sppp *sp = (struct sppp*)ifp; 995 struct mbuf *m; 996 int s; 997 998 s= splimp (); 999 1000 m = sp->pp_cpq.ifq_head; 1001 if (m == NULL && 1002 (sp->pp_phase == PHASE_NETWORK || sp->pp_mode == IFF_CISCO)) 1003 if ((m = sp->pp_fastq.ifq_head) == NULL) 1004 m = sp->pp_if.if_snd.ifq_head; 1005 splx (s); 1006 return (m); 1007} 1008 1009/* 1010 * Process an ioctl request. Called on low priority level. 1011 */ 1012int 1013sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data) 1014{ 1015 struct ifreq *ifr = (struct ifreq*) data; 1016 struct sppp *sp = (struct sppp*) ifp; 1017 int s, rv, going_up, going_down, newmode; 1018 1019 s = splimp(); 1020 rv = 0; 1021 switch (cmd) { 1022 case SIOCAIFADDR: 1023 case SIOCSIFDSTADDR: 1024 break; 1025 1026 case SIOCSIFADDR: 1027 if_up(ifp); 1028 /* fall through... */ 1029 1030 case SIOCSIFFLAGS: 1031 going_up = ifp->if_flags & IFF_UP && 1032 (ifp->if_flags & IFF_RUNNING) == 0; 1033 going_down = (ifp->if_flags & IFF_UP) == 0 && 1034 ifp->if_flags & IFF_RUNNING; 1035 1036 newmode = ifp->if_flags & IFF_PASSIVE; 1037 if (!newmode) 1038 newmode = ifp->if_flags & IFF_AUTO; 1039 if (!newmode) 1040 newmode = ifp->if_flags & IFF_CISCO; 1041 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO); 1042 ifp->if_flags |= newmode; 1043 1044 if (newmode != sp->pp_mode) { 1045 going_down = 1; 1046 if (!going_up) 1047 going_up = ifp->if_flags & IFF_RUNNING; 1048 } 1049 1050 if (going_down) { 1051 if (sp->pp_mode != IFF_CISCO) 1052 lcp.Close(sp); 1053 else if (sp->pp_tlf) 1054 (sp->pp_tlf)(sp); 1055 sppp_flush(ifp); 1056 ifp->if_flags &= ~IFF_RUNNING; 1057 sp->pp_mode = newmode; 1058 } 1059 1060 if (going_up) { 1061 if (sp->pp_mode != IFF_CISCO) 1062 lcp.Close(sp); 1063 sp->pp_mode = newmode; 1064 if (sp->pp_mode == 0) { 1065 ifp->if_flags |= IFF_RUNNING; 1066 lcp.Open(sp); 1067 } 1068 if (sp->pp_mode == IFF_CISCO) { 1069 if (sp->pp_tls) 1070 (sp->pp_tls)(sp); 1071 ifp->if_flags |= IFF_RUNNING; 1072 } 1073 } 1074 1075 break; 1076 1077#ifdef SIOCSIFMTU 1078#ifndef ifr_mtu 1079#define ifr_mtu ifr_metric 1080#endif 1081 case SIOCSIFMTU: 1082 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru) 1083 return (EINVAL); 1084 ifp->if_mtu = ifr->ifr_mtu; 1085 break; 1086#endif 1087#ifdef SLIOCSETMTU 1088 case SLIOCSETMTU: 1089 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru) 1090 return (EINVAL); 1091 ifp->if_mtu = *(short*)data; 1092 break; 1093#endif 1094#ifdef SIOCGIFMTU 1095 case SIOCGIFMTU: 1096 ifr->ifr_mtu = ifp->if_mtu; 1097 break; 1098#endif 1099#ifdef SLIOCGETMTU 1100 case SLIOCGETMTU: 1101 *(short*)data = ifp->if_mtu; 1102 break; 1103#endif 1104 case SIOCADDMULTI: 1105 case SIOCDELMULTI: 1106 break; 1107 1108 case SIOCGIFGENERIC: 1109 case SIOCSIFGENERIC: 1110 rv = sppp_params(sp, cmd, data); 1111 break; 1112 1113 default: 1114 rv = ENOTTY; 1115 } 1116 splx(s); 1117 return rv; 1118} 1119 1120/* 1121 * Cisco framing implementation. 1122 */ 1123 1124/* 1125 * Handle incoming Cisco keepalive protocol packets. 1126 */ 1127static void 1128sppp_cisco_input(struct sppp *sp, struct mbuf *m) 1129{ 1130 STDDCL; 1131 struct cisco_packet *h; 1132 u_long me, mymask; 1133 1134 if (m->m_pkthdr.len < CISCO_PACKET_LEN) { 1135 if (debug) 1136 log(LOG_DEBUG, 1137 SPP_FMT "cisco invalid packet length: %d bytes\n", 1138 SPP_ARGS(ifp), m->m_pkthdr.len); 1139 return; 1140 } 1141 h = mtod (m, struct cisco_packet*); 1142 if (debug) 1143 log(LOG_DEBUG, 1144 SPP_FMT "cisco input: %d bytes " 1145 "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n", 1146 SPP_ARGS(ifp), m->m_pkthdr.len, 1147 (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel, 1148 (u_int)h->time0, (u_int)h->time1); 1149 switch (ntohl (h->type)) { 1150 default: 1151 if (debug) 1152 log(-1, SPP_FMT "cisco unknown packet type: 0x%lx\n", 1153 SPP_ARGS(ifp), (u_long)ntohl (h->type)); 1154 break; 1155 case CISCO_ADDR_REPLY: 1156 /* Reply on address request, ignore */ 1157 break; 1158 case CISCO_KEEPALIVE_REQ: 1159 sp->pp_alivecnt = 0; 1160 sp->pp_rseq[IDX_LCP] = ntohl (h->par1); 1161 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) { 1162 /* Local and remote sequence numbers are equal. 1163 * Probably, the line is in loopback mode. */ 1164 if (sp->pp_loopcnt >= MAXALIVECNT) { 1165 printf (SPP_FMT "loopback\n", 1166 SPP_ARGS(ifp)); 1167 sp->pp_loopcnt = 0; 1168 if (ifp->if_flags & IFF_UP) { 1169 if_down (ifp); 1170 sppp_qflush (&sp->pp_cpq); 1171 } 1172 } 1173 ++sp->pp_loopcnt; 1174 1175 /* Generate new local sequence number */ 1176#if defined(__FreeBSD__) && __FreeBSD__ >= 3 1177 sp->pp_seq[IDX_LCP] = random(); 1178#else 1179 sp->pp_seq[IDX_LCP] ^= time.tv_sec ^ time.tv_usec; 1180#endif 1181 break; 1182 } 1183 sp->pp_loopcnt = 0; 1184 if (! (ifp->if_flags & IFF_UP) && 1185 (ifp->if_flags & IFF_RUNNING)) { 1186 if_up(ifp); 1187 printf (SPP_FMT "up\n", SPP_ARGS(ifp)); 1188 } 1189 break; 1190 case CISCO_ADDR_REQ: 1191 sppp_get_ip_addrs(sp, &me, 0, &mymask); 1192 if (me != 0L) 1193 sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask); 1194 break; 1195 } 1196} 1197 1198/* 1199 * Send Cisco keepalive packet. 1200 */ 1201static void 1202sppp_cisco_send(struct sppp *sp, int type, long par1, long par2) 1203{ 1204 STDDCL; 1205 struct ppp_header *h; 1206 struct cisco_packet *ch; 1207 struct mbuf *m; 1208#if defined(__FreeBSD__) && __FreeBSD__ >= 3 1209 struct timeval tv; 1210#else 1211 u_long t = (time.tv_sec - boottime.tv_sec) * 1000; 1212#endif 1213 1214#if defined(__FreeBSD__) && __FreeBSD__ >= 3 1215 getmicrouptime(&tv); 1216#endif 1217 1218 MGETHDR (m, M_DONTWAIT, MT_DATA); 1219 if (! m) 1220 return; 1221 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN; 1222 m->m_pkthdr.rcvif = 0; 1223 1224 h = mtod (m, struct ppp_header*); 1225 h->address = CISCO_MULTICAST; 1226 h->control = 0; 1227 h->protocol = htons (CISCO_KEEPALIVE); 1228 1229 ch = (struct cisco_packet*) (h + 1); 1230 ch->type = htonl (type); 1231 ch->par1 = htonl (par1); 1232 ch->par2 = htonl (par2); 1233 ch->rel = -1; 1234 1235#if defined(__FreeBSD__) && __FreeBSD__ >= 3 1236 ch->time0 = htons ((u_short) (tv.tv_sec >> 16)); 1237 ch->time1 = htons ((u_short) tv.tv_sec); 1238#else 1239 ch->time0 = htons ((u_short) (t >> 16)); 1240 ch->time1 = htons ((u_short) t); 1241#endif 1242 1243 if (debug) 1244 log(LOG_DEBUG, 1245 SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n", 1246 SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1, 1247 (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1); 1248 1249 if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3)) 1250 ifp->if_oerrors++; 1251} 1252 1253/* 1254 * PPP protocol implementation. 1255 */ 1256 1257/* 1258 * Send PPP control protocol packet. 1259 */ 1260static void 1261sppp_cp_send(struct sppp *sp, u_short proto, u_char type, 1262 u_char ident, u_short len, void *data) 1263{ 1264 STDDCL; 1265 struct ppp_header *h; 1266 struct lcp_header *lh; 1267 struct mbuf *m; 1268 1269 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) 1270 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN; 1271 MGETHDR (m, M_DONTWAIT, MT_DATA); 1272 if (! m) 1273 return; 1274 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len; 1275 m->m_pkthdr.rcvif = 0; 1276 1277 h = mtod (m, struct ppp_header*); 1278 h->address = PPP_ALLSTATIONS; /* broadcast address */ 1279 h->control = PPP_UI; /* Unnumbered Info */ 1280 h->protocol = htons (proto); /* Link Control Protocol */ 1281 1282 lh = (struct lcp_header*) (h + 1); 1283 lh->type = type; 1284 lh->ident = ident; 1285 lh->len = htons (LCP_HEADER_LEN + len); 1286 if (len) 1287 bcopy (data, lh+1, len); 1288 1289 if (debug) { 1290 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 1291 SPP_ARGS(ifp), 1292 sppp_proto_name(proto), 1293 sppp_cp_type_name (lh->type), lh->ident, 1294 ntohs (lh->len)); 1295 sppp_print_bytes ((u_char*) (lh+1), len); 1296 log(-1, ">\n"); 1297 } 1298 if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3)) 1299 ifp->if_oerrors++; 1300} 1301 1302/* 1303 * Handle incoming PPP control protocol packets. 1304 */ 1305static void 1306sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m) 1307{ 1308 STDDCL; 1309 struct lcp_header *h; 1310 int len = m->m_pkthdr.len; 1311 int rv; 1312 u_char *p; 1313 1314 if (len < 4) { 1315 if (debug) 1316 log(LOG_DEBUG, 1317 SPP_FMT "%s invalid packet length: %d bytes\n", 1318 SPP_ARGS(ifp), cp->name, len); 1319 return; 1320 } 1321 h = mtod (m, struct lcp_header*); 1322 if (debug) { 1323 log(LOG_DEBUG, 1324 SPP_FMT "%s input(%s): <%s id=0x%x len=%d", 1325 SPP_ARGS(ifp), cp->name, 1326 sppp_state_name(sp->state[cp->protoidx]), 1327 sppp_cp_type_name (h->type), h->ident, ntohs (h->len)); 1328 sppp_print_bytes ((u_char*) (h+1), len-4); 1329 log(-1, ">\n"); 1330 } 1331 if (len > ntohs (h->len)) 1332 len = ntohs (h->len); 1333 p = (u_char *)(h + 1); 1334 switch (h->type) { 1335 case CONF_REQ: 1336 if (len < 4) { 1337 if (debug) 1338 log(-1, SPP_FMT "%s invalid conf-req length %d\n", 1339 SPP_ARGS(ifp), cp->name, 1340 len); 1341 ++ifp->if_ierrors; 1342 break; 1343 } 1344 /* handle states where RCR doesn't get a SCA/SCN */ 1345 switch (sp->state[cp->protoidx]) { 1346 case STATE_CLOSING: 1347 case STATE_STOPPING: 1348 return; 1349 case STATE_CLOSED: 1350 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 1351 0, 0); 1352 return; 1353 } 1354 rv = (cp->RCR)(sp, h, len); 1355 switch (sp->state[cp->protoidx]) { 1356 case STATE_OPENED: 1357 (cp->tld)(sp); 1358 (cp->scr)(sp); 1359 /* fall through... */ 1360 case STATE_ACK_SENT: 1361 case STATE_REQ_SENT: 1362 /* 1363 * sppp_cp_change_state() have the side effect of 1364 * restarting the timeouts. We want to avoid that 1365 * if the state don't change, otherwise we won't 1366 * ever timeout and resend a configuration request 1367 * that got lost. 1368 */ 1369 if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT: 1370 STATE_REQ_SENT)) 1371 break; 1372 sppp_cp_change_state(cp, sp, rv? 1373 STATE_ACK_SENT: STATE_REQ_SENT); 1374 break; 1375 case STATE_STOPPED: 1376 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1377 (cp->scr)(sp); 1378 sppp_cp_change_state(cp, sp, rv? 1379 STATE_ACK_SENT: STATE_REQ_SENT); 1380 break; 1381 case STATE_ACK_RCVD: 1382 if (rv) { 1383 sppp_cp_change_state(cp, sp, STATE_OPENED); 1384 if (debug) 1385 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1386 SPP_ARGS(ifp), 1387 cp->name); 1388 (cp->tlu)(sp); 1389 } else 1390 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1391 break; 1392 default: 1393 printf(SPP_FMT "%s illegal %s in state %s\n", 1394 SPP_ARGS(ifp), cp->name, 1395 sppp_cp_type_name(h->type), 1396 sppp_state_name(sp->state[cp->protoidx])); 1397 ++ifp->if_ierrors; 1398 } 1399 break; 1400 case CONF_ACK: 1401 if (h->ident != sp->confid[cp->protoidx]) { 1402 if (debug) 1403 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1404 SPP_ARGS(ifp), cp->name, 1405 h->ident, sp->confid[cp->protoidx]); 1406 ++ifp->if_ierrors; 1407 break; 1408 } 1409 switch (sp->state[cp->protoidx]) { 1410 case STATE_CLOSED: 1411 case STATE_STOPPED: 1412 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1413 break; 1414 case STATE_CLOSING: 1415 case STATE_STOPPING: 1416 break; 1417 case STATE_REQ_SENT: 1418 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1419 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1420 break; 1421 case STATE_OPENED: 1422 (cp->tld)(sp); 1423 /* fall through */ 1424 case STATE_ACK_RCVD: 1425 (cp->scr)(sp); 1426 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1427 break; 1428 case STATE_ACK_SENT: 1429 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1430 sppp_cp_change_state(cp, sp, STATE_OPENED); 1431 if (debug) 1432 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 1433 SPP_ARGS(ifp), cp->name); 1434 (cp->tlu)(sp); 1435 break; 1436 default: 1437 printf(SPP_FMT "%s illegal %s in state %s\n", 1438 SPP_ARGS(ifp), cp->name, 1439 sppp_cp_type_name(h->type), 1440 sppp_state_name(sp->state[cp->protoidx])); 1441 ++ifp->if_ierrors; 1442 } 1443 break; 1444 case CONF_NAK: 1445 case CONF_REJ: 1446 if (h->ident != sp->confid[cp->protoidx]) { 1447 if (debug) 1448 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n", 1449 SPP_ARGS(ifp), cp->name, 1450 h->ident, sp->confid[cp->protoidx]); 1451 ++ifp->if_ierrors; 1452 break; 1453 } 1454 if (h->type == CONF_NAK) 1455 (cp->RCN_nak)(sp, h, len); 1456 else /* CONF_REJ */ 1457 (cp->RCN_rej)(sp, h, len); 1458 1459 switch (sp->state[cp->protoidx]) { 1460 case STATE_CLOSED: 1461 case STATE_STOPPED: 1462 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1463 break; 1464 case STATE_REQ_SENT: 1465 case STATE_ACK_SENT: 1466 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1467 /* 1468 * Slow things down a bit if we think we might be 1469 * in loopback. Depend on the timeout to send the 1470 * next configuration request. 1471 */ 1472 if (sp->pp_loopcnt) 1473 break; 1474 (cp->scr)(sp); 1475 break; 1476 case STATE_OPENED: 1477 (cp->tld)(sp); 1478 /* fall through */ 1479 case STATE_ACK_RCVD: 1480 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1481 (cp->scr)(sp); 1482 break; 1483 case STATE_CLOSING: 1484 case STATE_STOPPING: 1485 break; 1486 default: 1487 printf(SPP_FMT "%s illegal %s in state %s\n", 1488 SPP_ARGS(ifp), cp->name, 1489 sppp_cp_type_name(h->type), 1490 sppp_state_name(sp->state[cp->protoidx])); 1491 ++ifp->if_ierrors; 1492 } 1493 break; 1494 1495 case TERM_REQ: 1496 switch (sp->state[cp->protoidx]) { 1497 case STATE_ACK_RCVD: 1498 case STATE_ACK_SENT: 1499 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1500 /* fall through */ 1501 case STATE_CLOSED: 1502 case STATE_STOPPED: 1503 case STATE_CLOSING: 1504 case STATE_STOPPING: 1505 case STATE_REQ_SENT: 1506 sta: 1507 /* Send Terminate-Ack packet. */ 1508 if (debug) 1509 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n", 1510 SPP_ARGS(ifp), cp->name); 1511 sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0); 1512 break; 1513 case STATE_OPENED: 1514 (cp->tld)(sp); 1515 sp->rst_counter[cp->protoidx] = 0; 1516 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1517 goto sta; 1518 break; 1519 default: 1520 printf(SPP_FMT "%s illegal %s in state %s\n", 1521 SPP_ARGS(ifp), cp->name, 1522 sppp_cp_type_name(h->type), 1523 sppp_state_name(sp->state[cp->protoidx])); 1524 ++ifp->if_ierrors; 1525 } 1526 break; 1527 case TERM_ACK: 1528 switch (sp->state[cp->protoidx]) { 1529 case STATE_CLOSED: 1530 case STATE_STOPPED: 1531 case STATE_REQ_SENT: 1532 case STATE_ACK_SENT: 1533 break; 1534 case STATE_CLOSING: 1535 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1536 (cp->tlf)(sp); 1537 break; 1538 case STATE_STOPPING: 1539 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1540 (cp->tlf)(sp); 1541 break; 1542 case STATE_ACK_RCVD: 1543 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1544 break; 1545 case STATE_OPENED: 1546 (cp->tld)(sp); 1547 (cp->scr)(sp); 1548 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD); 1549 break; 1550 default: 1551 printf(SPP_FMT "%s illegal %s in state %s\n", 1552 SPP_ARGS(ifp), cp->name, 1553 sppp_cp_type_name(h->type), 1554 sppp_state_name(sp->state[cp->protoidx])); 1555 ++ifp->if_ierrors; 1556 } 1557 break; 1558 case CODE_REJ: 1559 case PROTO_REJ: 1560 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */ 1561 log(LOG_INFO, 1562 SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, " 1563 "danger will robinson\n", 1564 SPP_ARGS(ifp), cp->name, 1565 sppp_cp_type_name(h->type), ntohs(*((u_short *)p))); 1566 switch (sp->state[cp->protoidx]) { 1567 case STATE_CLOSED: 1568 case STATE_STOPPED: 1569 case STATE_REQ_SENT: 1570 case STATE_ACK_SENT: 1571 case STATE_CLOSING: 1572 case STATE_STOPPING: 1573 case STATE_OPENED: 1574 break; 1575 case STATE_ACK_RCVD: 1576 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1577 break; 1578 default: 1579 printf(SPP_FMT "%s illegal %s in state %s\n", 1580 SPP_ARGS(ifp), cp->name, 1581 sppp_cp_type_name(h->type), 1582 sppp_state_name(sp->state[cp->protoidx])); 1583 ++ifp->if_ierrors; 1584 } 1585 break; 1586 case DISC_REQ: 1587 if (cp->proto != PPP_LCP) 1588 goto illegal; 1589 /* Discard the packet. */ 1590 break; 1591 case ECHO_REQ: 1592 if (cp->proto != PPP_LCP) 1593 goto illegal; 1594 if (sp->state[cp->protoidx] != STATE_OPENED) { 1595 if (debug) 1596 log(-1, SPP_FMT "lcp echo req but lcp closed\n", 1597 SPP_ARGS(ifp)); 1598 ++ifp->if_ierrors; 1599 break; 1600 } 1601 if (len < 8) { 1602 if (debug) 1603 log(-1, SPP_FMT "invalid lcp echo request " 1604 "packet length: %d bytes\n", 1605 SPP_ARGS(ifp), len); 1606 break; 1607 } 1608 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 1609 ntohl (*(long*)(h+1)) == sp->lcp.magic) { 1610 /* Line loopback mode detected. */ 1611 printf(SPP_FMT "loopback\n", SPP_ARGS(ifp)); 1612 sp->pp_loopcnt = MAXALIVECNT * 5; 1613 if_down (ifp); 1614 sppp_qflush (&sp->pp_cpq); 1615 1616 /* Shut down the PPP link. */ 1617 /* XXX */ 1618 lcp.Down(sp); 1619 lcp.Up(sp); 1620 break; 1621 } 1622 *(long*)(h+1) = htonl (sp->lcp.magic); 1623 if (debug) 1624 log(-1, SPP_FMT "got lcp echo req, sending echo rep\n", 1625 SPP_ARGS(ifp)); 1626 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1); 1627 break; 1628 case ECHO_REPLY: 1629 if (cp->proto != PPP_LCP) 1630 goto illegal; 1631 if (h->ident != sp->lcp.echoid) { 1632 ++ifp->if_ierrors; 1633 break; 1634 } 1635 if (len < 8) { 1636 if (debug) 1637 log(-1, SPP_FMT "lcp invalid echo reply " 1638 "packet length: %d bytes\n", 1639 SPP_ARGS(ifp), len); 1640 break; 1641 } 1642 if (debug) 1643 log(-1, SPP_FMT "lcp got echo rep\n", 1644 SPP_ARGS(ifp)); 1645 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) || 1646 ntohl (*(long*)(h+1)) != sp->lcp.magic) 1647 sp->pp_alivecnt = 0; 1648 break; 1649 default: 1650 /* Unknown packet type -- send Code-Reject packet. */ 1651 illegal: 1652 if (debug) 1653 log(-1, SPP_FMT "%s send code-rej for 0x%x\n", 1654 SPP_ARGS(ifp), cp->name, h->type); 1655 sppp_cp_send(sp, cp->proto, CODE_REJ, 1656 ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h); 1657 ++ifp->if_ierrors; 1658 } 1659} 1660 1661 1662/* 1663 * The generic part of all Up/Down/Open/Close/TO event handlers. 1664 * Basically, the state transition handling in the automaton. 1665 */ 1666static void 1667sppp_up_event(const struct cp *cp, struct sppp *sp) 1668{ 1669 STDDCL; 1670 1671 if (debug) 1672 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n", 1673 SPP_ARGS(ifp), cp->name, 1674 sppp_state_name(sp->state[cp->protoidx])); 1675 1676 switch (sp->state[cp->protoidx]) { 1677 case STATE_INITIAL: 1678 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1679 break; 1680 case STATE_STARTING: 1681 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1682 (cp->scr)(sp); 1683 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1684 break; 1685 default: 1686 printf(SPP_FMT "%s illegal up in state %s\n", 1687 SPP_ARGS(ifp), cp->name, 1688 sppp_state_name(sp->state[cp->protoidx])); 1689 } 1690} 1691 1692static void 1693sppp_down_event(const struct cp *cp, struct sppp *sp) 1694{ 1695 STDDCL; 1696 1697 if (debug) 1698 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n", 1699 SPP_ARGS(ifp), cp->name, 1700 sppp_state_name(sp->state[cp->protoidx])); 1701 1702 switch (sp->state[cp->protoidx]) { 1703 case STATE_CLOSED: 1704 case STATE_CLOSING: 1705 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1706 break; 1707 case STATE_STOPPED: 1708 sppp_cp_change_state(cp, sp, STATE_STARTING); 1709 (cp->tls)(sp); 1710 break; 1711 case STATE_STOPPING: 1712 case STATE_REQ_SENT: 1713 case STATE_ACK_RCVD: 1714 case STATE_ACK_SENT: 1715 sppp_cp_change_state(cp, sp, STATE_STARTING); 1716 break; 1717 case STATE_OPENED: 1718 (cp->tld)(sp); 1719 sppp_cp_change_state(cp, sp, STATE_STARTING); 1720 break; 1721 default: 1722 printf(SPP_FMT "%s illegal down in state %s\n", 1723 SPP_ARGS(ifp), cp->name, 1724 sppp_state_name(sp->state[cp->protoidx])); 1725 } 1726} 1727 1728 1729static void 1730sppp_open_event(const struct cp *cp, struct sppp *sp) 1731{ 1732 STDDCL; 1733 1734 if (debug) 1735 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n", 1736 SPP_ARGS(ifp), cp->name, 1737 sppp_state_name(sp->state[cp->protoidx])); 1738 1739 switch (sp->state[cp->protoidx]) { 1740 case STATE_INITIAL: 1741 sppp_cp_change_state(cp, sp, STATE_STARTING); 1742 (cp->tls)(sp); 1743 break; 1744 case STATE_STARTING: 1745 break; 1746 case STATE_CLOSED: 1747 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure; 1748 (cp->scr)(sp); 1749 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1750 break; 1751 case STATE_STOPPED: 1752 /* 1753 * Try escaping stopped state. This seems to bite 1754 * people occasionally, in particular for IPCP, 1755 * presumably following previous IPCP negotiation 1756 * aborts. Somehow, we must have missed a Down event 1757 * which would have caused a transition into starting 1758 * state, so as a bandaid we force the Down event now. 1759 * This effectively implements (something like the) 1760 * `restart' option mentioned in the state transition 1761 * table of RFC 1661. 1762 */ 1763 sppp_cp_change_state(cp, sp, STATE_STARTING); 1764 (cp->tls)(sp); 1765 break; 1766 case STATE_STOPPING: 1767 case STATE_REQ_SENT: 1768 case STATE_ACK_RCVD: 1769 case STATE_ACK_SENT: 1770 case STATE_OPENED: 1771 break; 1772 case STATE_CLOSING: 1773 sppp_cp_change_state(cp, sp, STATE_STOPPING); 1774 break; 1775 } 1776} 1777 1778 1779static void 1780sppp_close_event(const struct cp *cp, struct sppp *sp) 1781{ 1782 STDDCL; 1783 1784 if (debug) 1785 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n", 1786 SPP_ARGS(ifp), cp->name, 1787 sppp_state_name(sp->state[cp->protoidx])); 1788 1789 switch (sp->state[cp->protoidx]) { 1790 case STATE_INITIAL: 1791 case STATE_CLOSED: 1792 case STATE_CLOSING: 1793 break; 1794 case STATE_STARTING: 1795 sppp_cp_change_state(cp, sp, STATE_INITIAL); 1796 (cp->tlf)(sp); 1797 break; 1798 case STATE_STOPPED: 1799 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1800 break; 1801 case STATE_STOPPING: 1802 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1803 break; 1804 case STATE_OPENED: 1805 (cp->tld)(sp); 1806 /* fall through */ 1807 case STATE_REQ_SENT: 1808 case STATE_ACK_RCVD: 1809 case STATE_ACK_SENT: 1810 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate; 1811 sppp_cp_send(sp, cp->proto, TERM_REQ, 1812 ++sp->pp_seq[cp->protoidx], 0, 0); 1813 sppp_cp_change_state(cp, sp, STATE_CLOSING); 1814 break; 1815 } 1816} 1817 1818static void 1819sppp_to_event(const struct cp *cp, struct sppp *sp) 1820{ 1821 STDDCL; 1822 int s; 1823 1824 s = splimp(); 1825 if (debug) 1826 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n", 1827 SPP_ARGS(ifp), cp->name, 1828 sppp_state_name(sp->state[cp->protoidx]), 1829 sp->rst_counter[cp->protoidx]); 1830 1831 if (--sp->rst_counter[cp->protoidx] < 0) 1832 /* TO- event */ 1833 switch (sp->state[cp->protoidx]) { 1834 case STATE_CLOSING: 1835 sppp_cp_change_state(cp, sp, STATE_CLOSED); 1836 (cp->tlf)(sp); 1837 break; 1838 case STATE_STOPPING: 1839 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1840 (cp->tlf)(sp); 1841 break; 1842 case STATE_REQ_SENT: 1843 case STATE_ACK_RCVD: 1844 case STATE_ACK_SENT: 1845 sppp_cp_change_state(cp, sp, STATE_STOPPED); 1846 (cp->tlf)(sp); 1847 break; 1848 } 1849 else 1850 /* TO+ event */ 1851 switch (sp->state[cp->protoidx]) { 1852 case STATE_CLOSING: 1853 case STATE_STOPPING: 1854 sppp_cp_send(sp, cp->proto, TERM_REQ, 1855 ++sp->pp_seq[cp->protoidx], 0, 0); 1856 TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout, 1857 sp->ch[cp->protoidx]); 1858 break; 1859 case STATE_REQ_SENT: 1860 case STATE_ACK_RCVD: 1861 (cp->scr)(sp); 1862 /* sppp_cp_change_state() will restart the timer */ 1863 sppp_cp_change_state(cp, sp, STATE_REQ_SENT); 1864 break; 1865 case STATE_ACK_SENT: 1866 (cp->scr)(sp); 1867 TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout, 1868 sp->ch[cp->protoidx]); 1869 break; 1870 } 1871 1872 splx(s); 1873} 1874 1875/* 1876 * Change the state of a control protocol in the state automaton. 1877 * Takes care of starting/stopping the restart timer. 1878 */ 1879void 1880sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate) 1881{ 1882 sp->state[cp->protoidx] = newstate; 1883 1884 UNTIMEOUT(cp->TO, (void *)sp, sp->ch[cp->protoidx]); 1885 switch (newstate) { 1886 case STATE_INITIAL: 1887 case STATE_STARTING: 1888 case STATE_CLOSED: 1889 case STATE_STOPPED: 1890 case STATE_OPENED: 1891 break; 1892 case STATE_CLOSING: 1893 case STATE_STOPPING: 1894 case STATE_REQ_SENT: 1895 case STATE_ACK_RCVD: 1896 case STATE_ACK_SENT: 1897 TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout, 1898 sp->ch[cp->protoidx]); 1899 break; 1900 } 1901} 1902 1903/* 1904 *--------------------------------------------------------------------------* 1905 * * 1906 * The LCP implementation. * 1907 * * 1908 *--------------------------------------------------------------------------* 1909 */ 1910static void 1911sppp_lcp_init(struct sppp *sp) 1912{ 1913 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1914 sp->lcp.magic = 0; 1915 sp->state[IDX_LCP] = STATE_INITIAL; 1916 sp->fail_counter[IDX_LCP] = 0; 1917 sp->pp_seq[IDX_LCP] = 0; 1918 sp->pp_rseq[IDX_LCP] = 0; 1919 sp->lcp.protos = 0; 1920 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 1921 1922 /* Note that these values are relevant for all control protocols */ 1923 sp->lcp.timeout = 3 * hz; 1924 sp->lcp.max_terminate = 2; 1925 sp->lcp.max_configure = 10; 1926 sp->lcp.max_failure = 10; 1927#if defined(__FreeBSD__) && __FreeBSD__ >= 3 1928 callout_handle_init(&sp->ch[IDX_LCP]); 1929#endif 1930} 1931 1932static void 1933sppp_lcp_up(struct sppp *sp) 1934{ 1935 STDDCL; 1936 1937 sp->pp_alivecnt = 0; 1938 sp->lcp.opts = (1 << LCP_OPT_MAGIC); 1939 sp->lcp.magic = 0; 1940 sp->lcp.protos = 0; 1941 sp->lcp.mru = sp->lcp.their_mru = PP_MTU; 1942 /* 1943 * If we are authenticator, negotiate LCP_AUTH 1944 */ 1945 if (sp->hisauth.proto != 0) 1946 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO); 1947 else 1948 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 1949 sp->pp_flags &= ~PP_NEEDAUTH; 1950 /* 1951 * If this interface is passive or dial-on-demand, and we are 1952 * still in Initial state, it means we've got an incoming 1953 * call. Activate the interface. 1954 */ 1955 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) { 1956 if (debug) 1957 log(LOG_DEBUG, 1958 SPP_FMT "Up event", SPP_ARGS(ifp)); 1959 ifp->if_flags |= IFF_RUNNING; 1960 if (sp->state[IDX_LCP] == STATE_INITIAL) { 1961 if (debug) 1962 log(-1, "(incoming call)\n"); 1963 sp->pp_flags |= PP_CALLIN; 1964 lcp.Open(sp); 1965 } else if (debug) 1966 log(-1, "\n"); 1967 } 1968 1969 sppp_up_event(&lcp, sp); 1970} 1971 1972static void 1973sppp_lcp_down(struct sppp *sp) 1974{ 1975 STDDCL; 1976 1977 sppp_down_event(&lcp, sp); 1978 1979 /* 1980 * If this is neither a dial-on-demand nor a passive 1981 * interface, simulate an ``ifconfig down'' action, so the 1982 * administrator can force a redial by another ``ifconfig 1983 * up''. XXX For leased line operation, should we immediately 1984 * try to reopen the connection here? 1985 */ 1986 if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) { 1987 log(LOG_INFO, 1988 SPP_FMT "Down event, taking interface down.\n", 1989 SPP_ARGS(ifp)); 1990 if_down(ifp); 1991 } else { 1992 if (debug) 1993 log(LOG_DEBUG, 1994 SPP_FMT "Down event (carrier loss)\n", 1995 SPP_ARGS(ifp)); 1996 sp->pp_flags &= ~PP_CALLIN; 1997 if (sp->state[IDX_LCP] != STATE_INITIAL) 1998 lcp.Close(sp); 1999 ifp->if_flags &= ~IFF_RUNNING; 2000 } 2001} 2002 2003static void 2004sppp_lcp_open(struct sppp *sp) 2005{ 2006 sppp_open_event(&lcp, sp); 2007} 2008 2009static void 2010sppp_lcp_close(struct sppp *sp) 2011{ 2012 sppp_close_event(&lcp, sp); 2013} 2014 2015static void 2016sppp_lcp_TO(void *cookie) 2017{ 2018 sppp_to_event(&lcp, (struct sppp *)cookie); 2019} 2020 2021/* 2022 * Analyze a configure request. Return true if it was agreeable, and 2023 * caused action sca, false if it has been rejected or nak'ed, and 2024 * caused action scn. (The return value is used to make the state 2025 * transition decision in the state automaton.) 2026 */ 2027static int 2028sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2029{ 2030 STDDCL; 2031 u_char *buf, *r, *p; 2032 int origlen, rlen; 2033 u_long nmagic; 2034 u_short authproto; 2035 2036 len -= 4; 2037 origlen = len; 2038 buf = r = malloc (len, M_TEMP, M_NOWAIT); 2039 if (! buf) 2040 return (0); 2041 2042 if (debug) 2043 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ", 2044 SPP_ARGS(ifp)); 2045 2046 /* pass 1: check for things that need to be rejected */ 2047 p = (void*) (h+1); 2048 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2049 if (debug) 2050 log(-1, " %s ", sppp_lcp_opt_name(*p)); 2051 switch (*p) { 2052 case LCP_OPT_MAGIC: 2053 /* Magic number. */ 2054 if (len >= 6 && p[1] == 6) 2055 continue; 2056 if (debug) 2057 log(-1, "[invalid] "); 2058 break; 2059 case LCP_OPT_ASYNC_MAP: 2060 /* Async control character map. */ 2061 if (len >= 6 && p[1] == 6) 2062 continue; 2063 if (debug) 2064 log(-1, "[invalid] "); 2065 break; 2066 case LCP_OPT_MRU: 2067 /* Maximum receive unit. */ 2068 if (len >= 4 && p[1] == 4) 2069 continue; 2070 if (debug) 2071 log(-1, "[invalid] "); 2072 break; 2073 case LCP_OPT_AUTH_PROTO: 2074 if (len < 4) { 2075 if (debug) 2076 log(-1, "[invalid] "); 2077 break; 2078 } 2079 authproto = (p[2] << 8) + p[3]; 2080 if (authproto == PPP_CHAP && p[1] != 5) { 2081 if (debug) 2082 log(-1, "[invalid chap len] "); 2083 break; 2084 } 2085 if (sp->myauth.proto == 0) { 2086 /* we are not configured to do auth */ 2087 if (debug) 2088 log(-1, "[not configured] "); 2089 break; 2090 } 2091 /* 2092 * Remote want us to authenticate, remember this, 2093 * so we stay in PHASE_AUTHENTICATE after LCP got 2094 * up. 2095 */ 2096 sp->pp_flags |= PP_NEEDAUTH; 2097 continue; 2098 default: 2099 /* Others not supported. */ 2100 if (debug) 2101 log(-1, "[rej] "); 2102 break; 2103 } 2104 /* Add the option to rejected list. */ 2105 bcopy (p, r, p[1]); 2106 r += p[1]; 2107 rlen += p[1]; 2108 } 2109 if (rlen) { 2110 if (debug) 2111 log(-1, " send conf-rej\n"); 2112 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2113 return 0; 2114 } else if (debug) 2115 log(-1, "\n"); 2116 2117 /* 2118 * pass 2: check for option values that are unacceptable and 2119 * thus require to be nak'ed. 2120 */ 2121 if (debug) 2122 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ", 2123 SPP_ARGS(ifp)); 2124 2125 p = (void*) (h+1); 2126 len = origlen; 2127 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2128 if (debug) 2129 log(-1, " %s ", sppp_lcp_opt_name(*p)); 2130 switch (*p) { 2131 case LCP_OPT_MAGIC: 2132 /* Magic number -- extract. */ 2133 nmagic = (u_long)p[2] << 24 | 2134 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 2135 if (nmagic != sp->lcp.magic) { 2136 sp->pp_loopcnt = 0; 2137 if (debug) 2138 log(-1, "0x%lx ", nmagic); 2139 continue; 2140 } 2141 if (debug && sp->pp_loopcnt < MAXALIVECNT*5) 2142 log(-1, "[glitch] "); 2143 ++sp->pp_loopcnt; 2144 /* 2145 * We negate our magic here, and NAK it. If 2146 * we see it later in an NAK packet, we 2147 * suggest a new one. 2148 */ 2149 nmagic = ~sp->lcp.magic; 2150 /* Gonna NAK it. */ 2151 p[2] = nmagic >> 24; 2152 p[3] = nmagic >> 16; 2153 p[4] = nmagic >> 8; 2154 p[5] = nmagic; 2155 break; 2156 2157 case LCP_OPT_ASYNC_MAP: 2158 /* Async control character map -- check to be zero. */ 2159 if (! p[2] && ! p[3] && ! p[4] && ! p[5]) { 2160 if (debug) 2161 log(-1, "[empty] "); 2162 continue; 2163 } 2164 if (debug) 2165 log(-1, "[non-empty] "); 2166 /* suggest a zero one */ 2167 p[2] = p[3] = p[4] = p[5] = 0; 2168 break; 2169 2170 case LCP_OPT_MRU: 2171 /* 2172 * Maximum receive unit. Always agreeable, 2173 * but ignored by now. 2174 */ 2175 sp->lcp.their_mru = p[2] * 256 + p[3]; 2176 if (debug) 2177 log(-1, "%lu ", sp->lcp.their_mru); 2178 continue; 2179 2180 case LCP_OPT_AUTH_PROTO: 2181 authproto = (p[2] << 8) + p[3]; 2182 if (sp->myauth.proto != authproto) { 2183 /* not agreed, nak */ 2184 if (debug) 2185 log(-1, "[mine %s != his %s] ", 2186 sppp_proto_name(sp->hisauth.proto), 2187 sppp_proto_name(authproto)); 2188 p[2] = sp->myauth.proto >> 8; 2189 p[3] = sp->myauth.proto; 2190 break; 2191 } 2192 if (authproto == PPP_CHAP && p[4] != CHAP_MD5) { 2193 if (debug) 2194 log(-1, "[chap not MD5] "); 2195 p[4] = CHAP_MD5; 2196 break; 2197 } 2198 continue; 2199 } 2200 /* Add the option to nak'ed list. */ 2201 bcopy (p, r, p[1]); 2202 r += p[1]; 2203 rlen += p[1]; 2204 } 2205 if (rlen) { 2206 /* 2207 * Local and remote magics equal -- loopback? 2208 */ 2209 if (sp->pp_loopcnt >= MAXALIVECNT*5) { 2210 if (sp->pp_loopcnt == MAXALIVECNT*5) 2211 printf (SPP_FMT "loopback\n", 2212 SPP_ARGS(ifp)); 2213 if (ifp->if_flags & IFF_UP) { 2214 if_down(ifp); 2215 sppp_qflush(&sp->pp_cpq); 2216 /* XXX ? */ 2217 lcp.Down(sp); 2218 lcp.Up(sp); 2219 } 2220 } else if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) { 2221 if (debug) 2222 log(-1, " max_failure (%d) exceeded, " 2223 "send conf-rej\n", 2224 sp->lcp.max_failure); 2225 sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf); 2226 } else { 2227 if (debug) 2228 log(-1, " send conf-nak\n"); 2229 sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf); 2230 } 2231 } else { 2232 if (debug) 2233 log(-1, " send conf-ack\n"); 2234 sp->fail_counter[IDX_LCP] = 0; 2235 sp->pp_loopcnt = 0; 2236 sppp_cp_send (sp, PPP_LCP, CONF_ACK, 2237 h->ident, origlen, h+1); 2238 } 2239 2240 free (buf, M_TEMP); 2241 return (rlen == 0); 2242} 2243 2244/* 2245 * Analyze the LCP Configure-Reject option list, and adjust our 2246 * negotiation. 2247 */ 2248static void 2249sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2250{ 2251 STDDCL; 2252 u_char *buf, *p; 2253 2254 len -= 4; 2255 buf = malloc (len, M_TEMP, M_NOWAIT); 2256 if (!buf) 2257 return; 2258 2259 if (debug) 2260 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ", 2261 SPP_ARGS(ifp)); 2262 2263 p = (void*) (h+1); 2264 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2265 if (debug) 2266 log(-1, " %s ", sppp_lcp_opt_name(*p)); 2267 switch (*p) { 2268 case LCP_OPT_MAGIC: 2269 /* Magic number -- can't use it, use 0 */ 2270 sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC); 2271 sp->lcp.magic = 0; 2272 break; 2273 case LCP_OPT_MRU: 2274 /* 2275 * Should not be rejected anyway, since we only 2276 * negotiate a MRU if explicitly requested by 2277 * peer. 2278 */ 2279 sp->lcp.opts &= ~(1 << LCP_OPT_MRU); 2280 break; 2281 case LCP_OPT_AUTH_PROTO: 2282 /* 2283 * Peer doesn't want to authenticate himself, 2284 * deny unless this is a dialout call, and 2285 * AUTHFLAG_NOCALLOUT is set. 2286 */ 2287 if ((sp->pp_flags & PP_CALLIN) == 0 && 2288 (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) { 2289 if (debug) 2290 log(-1, "[don't insist on auth " 2291 "for callout]"); 2292 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO); 2293 break; 2294 } 2295 if (debug) 2296 log(-1, "[access denied]\n"); 2297 lcp.Close(sp); 2298 break; 2299 } 2300 } 2301 if (debug) 2302 log(-1, "\n"); 2303 free (buf, M_TEMP); 2304 return; 2305} 2306 2307/* 2308 * Analyze the LCP Configure-NAK option list, and adjust our 2309 * negotiation. 2310 */ 2311static void 2312sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2313{ 2314 STDDCL; 2315 u_char *buf, *p; 2316 u_long magic; 2317 2318 len -= 4; 2319 buf = malloc (len, M_TEMP, M_NOWAIT); 2320 if (!buf) 2321 return; 2322 2323 if (debug) 2324 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ", 2325 SPP_ARGS(ifp)); 2326 2327 p = (void*) (h+1); 2328 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2329 if (debug) 2330 log(-1, " %s ", sppp_lcp_opt_name(*p)); 2331 switch (*p) { 2332 case LCP_OPT_MAGIC: 2333 /* Magic number -- renegotiate */ 2334 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) && 2335 len >= 6 && p[1] == 6) { 2336 magic = (u_long)p[2] << 24 | 2337 (u_long)p[3] << 16 | p[4] << 8 | p[5]; 2338 /* 2339 * If the remote magic is our negated one, 2340 * this looks like a loopback problem. 2341 * Suggest a new magic to make sure. 2342 */ 2343 if (magic == ~sp->lcp.magic) { 2344 if (debug) 2345 log(-1, "magic glitch "); 2346#if defined(__FreeBSD__) && __FreeBSD__ >= 3 2347 sp->lcp.magic = random(); 2348#else 2349 sp->lcp.magic = time.tv_sec + time.tv_usec; 2350#endif 2351 } else { 2352 sp->lcp.magic = magic; 2353 if (debug) 2354 log(-1, "%lu ", magic); 2355 } 2356 } 2357 break; 2358 case LCP_OPT_MRU: 2359 /* 2360 * Peer wants to advise us to negotiate an MRU. 2361 * Agree on it if it's reasonable, or use 2362 * default otherwise. 2363 */ 2364 if (len >= 4 && p[1] == 4) { 2365 u_int mru = p[2] * 256 + p[3]; 2366 if (debug) 2367 log(-1, "%d ", mru); 2368 if (mru < PP_MTU || mru > PP_MAX_MRU) 2369 mru = PP_MTU; 2370 sp->lcp.mru = mru; 2371 sp->lcp.opts |= (1 << LCP_OPT_MRU); 2372 } 2373 break; 2374 case LCP_OPT_AUTH_PROTO: 2375 /* 2376 * Peer doesn't like our authentication method, 2377 * deny. 2378 */ 2379 if (debug) 2380 log(-1, "[access denied]\n"); 2381 lcp.Close(sp); 2382 break; 2383 } 2384 } 2385 if (debug) 2386 log(-1, "\n"); 2387 free (buf, M_TEMP); 2388 return; 2389} 2390 2391static void 2392sppp_lcp_tlu(struct sppp *sp) 2393{ 2394 STDDCL; 2395 int i; 2396 u_long mask; 2397 2398 /* XXX ? */ 2399 if (! (ifp->if_flags & IFF_UP) && 2400 (ifp->if_flags & IFF_RUNNING)) { 2401 /* Coming out of loopback mode. */ 2402 if_up(ifp); 2403 printf (SPP_FMT "up\n", SPP_ARGS(ifp)); 2404 } 2405 2406 for (i = 0; i < IDX_COUNT; i++) 2407 if ((cps[i])->flags & CP_QUAL) 2408 (cps[i])->Open(sp); 2409 2410 if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 || 2411 (sp->pp_flags & PP_NEEDAUTH) != 0) 2412 sp->pp_phase = PHASE_AUTHENTICATE; 2413 else 2414 sp->pp_phase = PHASE_NETWORK; 2415 2416 if (debug) 2417 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2418 sppp_phase_name(sp->pp_phase)); 2419 2420 /* 2421 * Open all authentication protocols. This is even required 2422 * if we already proceeded to network phase, since it might be 2423 * that remote wants us to authenticate, so we might have to 2424 * send a PAP request. Undesired authentication protocols 2425 * don't do anything when they get an Open event. 2426 */ 2427 for (i = 0; i < IDX_COUNT; i++) 2428 if ((cps[i])->flags & CP_AUTH) 2429 (cps[i])->Open(sp); 2430 2431 if (sp->pp_phase == PHASE_NETWORK) { 2432 /* Notify all NCPs. */ 2433 for (i = 0; i < IDX_COUNT; i++) 2434 if ((cps[i])->flags & CP_NCP) 2435 (cps[i])->Open(sp); 2436 } 2437 2438 /* Send Up events to all started protos. */ 2439 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2440 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0) 2441 (cps[i])->Up(sp); 2442 2443 /* notify low-level driver of state change */ 2444 if (sp->pp_chg) 2445 sp->pp_chg(sp, (int)sp->pp_phase); 2446 2447 if (sp->pp_phase == PHASE_NETWORK) 2448 /* if no NCP is starting, close down */ 2449 sppp_lcp_check_and_close(sp); 2450} 2451 2452static void 2453sppp_lcp_tld(struct sppp *sp) 2454{ 2455 STDDCL; 2456 int i; 2457 u_long mask; 2458 2459 sp->pp_phase = PHASE_TERMINATE; 2460 2461 if (debug) 2462 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2463 sppp_phase_name(sp->pp_phase)); 2464 2465 /* 2466 * Take upper layers down. We send the Down event first and 2467 * the Close second to prevent the upper layers from sending 2468 * ``a flurry of terminate-request packets'', as the RFC 2469 * describes it. 2470 */ 2471 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2472 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_LCP) == 0) { 2473 (cps[i])->Down(sp); 2474 (cps[i])->Close(sp); 2475 } 2476} 2477 2478static void 2479sppp_lcp_tls(struct sppp *sp) 2480{ 2481 STDDCL; 2482 2483 sp->pp_phase = PHASE_ESTABLISH; 2484 2485 if (debug) 2486 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2487 sppp_phase_name(sp->pp_phase)); 2488 2489 /* Notify lower layer if desired. */ 2490 if (sp->pp_tls) 2491 (sp->pp_tls)(sp); 2492 else 2493 (sp->pp_up)(sp); 2494} 2495 2496static void 2497sppp_lcp_tlf(struct sppp *sp) 2498{ 2499 STDDCL; 2500 2501 sp->pp_phase = PHASE_DEAD; 2502 if (debug) 2503 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 2504 sppp_phase_name(sp->pp_phase)); 2505 2506 /* Notify lower layer if desired. */ 2507 if (sp->pp_tlf) 2508 (sp->pp_tlf)(sp); 2509 else 2510 (sp->pp_down)(sp); 2511} 2512 2513static void 2514sppp_lcp_scr(struct sppp *sp) 2515{ 2516 char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */]; 2517 int i = 0; 2518 u_short authproto; 2519 2520 if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) { 2521 if (! sp->lcp.magic) 2522#if defined(__FreeBSD__) && __FreeBSD__ >= 3 2523 sp->lcp.magic = random(); 2524#else 2525 sp->lcp.magic = time.tv_sec + time.tv_usec; 2526#endif 2527 opt[i++] = LCP_OPT_MAGIC; 2528 opt[i++] = 6; 2529 opt[i++] = sp->lcp.magic >> 24; 2530 opt[i++] = sp->lcp.magic >> 16; 2531 opt[i++] = sp->lcp.magic >> 8; 2532 opt[i++] = sp->lcp.magic; 2533 } 2534 2535 if (sp->lcp.opts & (1 << LCP_OPT_MRU)) { 2536 opt[i++] = LCP_OPT_MRU; 2537 opt[i++] = 4; 2538 opt[i++] = sp->lcp.mru >> 8; 2539 opt[i++] = sp->lcp.mru; 2540 } 2541 2542 if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) { 2543 authproto = sp->hisauth.proto; 2544 opt[i++] = LCP_OPT_AUTH_PROTO; 2545 opt[i++] = authproto == PPP_CHAP? 5: 4; 2546 opt[i++] = authproto >> 8; 2547 opt[i++] = authproto; 2548 if (authproto == PPP_CHAP) 2549 opt[i++] = CHAP_MD5; 2550 } 2551 2552 sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP]; 2553 sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt); 2554} 2555 2556/* 2557 * Check the open NCPs, return true if at least one NCP is open. 2558 */ 2559static int 2560sppp_ncp_check(struct sppp *sp) 2561{ 2562 int i, mask; 2563 2564 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 2565 if (sp->lcp.protos & mask && (cps[i])->flags & CP_NCP) 2566 return 1; 2567 return 0; 2568} 2569 2570/* 2571 * Re-check the open NCPs and see if we should terminate the link. 2572 * Called by the NCPs during their tlf action handling. 2573 */ 2574static void 2575sppp_lcp_check_and_close(struct sppp *sp) 2576{ 2577 2578 if (sp->pp_phase < PHASE_NETWORK) 2579 /* don't bother, we are already going down */ 2580 return; 2581 2582 if (sppp_ncp_check(sp)) 2583 return; 2584 2585 lcp.Close(sp); 2586} 2587 2588/* 2589 *--------------------------------------------------------------------------* 2590 * * 2591 * The IPCP implementation. * 2592 * * 2593 *--------------------------------------------------------------------------* 2594 */ 2595 2596static void 2597sppp_ipcp_init(struct sppp *sp) 2598{ 2599 sp->ipcp.opts = 0; 2600 sp->ipcp.flags = 0; 2601 sp->state[IDX_IPCP] = STATE_INITIAL; 2602 sp->fail_counter[IDX_IPCP] = 0; 2603 sp->pp_seq[IDX_IPCP] = 0; 2604 sp->pp_rseq[IDX_IPCP] = 0; 2605#if defined(__FreeBSD__) && __FreeBSD__ >= 3 2606 callout_handle_init(&sp->ch[IDX_IPCP]); 2607#endif 2608} 2609 2610static void 2611sppp_ipcp_up(struct sppp *sp) 2612{ 2613 sppp_up_event(&ipcp, sp); 2614} 2615 2616static void 2617sppp_ipcp_down(struct sppp *sp) 2618{ 2619 sppp_down_event(&ipcp, sp); 2620} 2621 2622static void 2623sppp_ipcp_open(struct sppp *sp) 2624{ 2625 STDDCL; 2626 u_long myaddr, hisaddr; 2627 2628 sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN|IPCP_MYADDR_SEEN|IPCP_MYADDR_DYN); 2629 2630 sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0); 2631 /* 2632 * If we don't have his address, this probably means our 2633 * interface doesn't want to talk IP at all. (This could 2634 * be the case if somebody wants to speak only IPX, for 2635 * example.) Don't open IPCP in this case. 2636 */ 2637 if (hisaddr == 0L) { 2638 /* XXX this message should go away */ 2639 if (debug) 2640 log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n", 2641 SPP_ARGS(ifp)); 2642 return; 2643 } 2644 2645 if (myaddr == 0L) { 2646 /* 2647 * I don't have an assigned address, so i need to 2648 * negotiate my address. 2649 */ 2650 sp->ipcp.flags |= IPCP_MYADDR_DYN; 2651 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2652 } else 2653 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 2654 sppp_open_event(&ipcp, sp); 2655} 2656 2657static void 2658sppp_ipcp_close(struct sppp *sp) 2659{ 2660 sppp_close_event(&ipcp, sp); 2661 if (sp->ipcp.flags & IPCP_MYADDR_DYN) 2662 /* 2663 * My address was dynamic, clear it again. 2664 */ 2665 sppp_set_ip_addr(sp, 0L); 2666} 2667 2668static void 2669sppp_ipcp_TO(void *cookie) 2670{ 2671 sppp_to_event(&ipcp, (struct sppp *)cookie); 2672} 2673 2674/* 2675 * Analyze a configure request. Return true if it was agreeable, and 2676 * caused action sca, false if it has been rejected or nak'ed, and 2677 * caused action scn. (The return value is used to make the state 2678 * transition decision in the state automaton.) 2679 */ 2680static int 2681sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len) 2682{ 2683 u_char *buf, *r, *p; 2684 struct ifnet *ifp = &sp->pp_if; 2685 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 2686 u_long hisaddr, desiredaddr; 2687 int gotmyaddr = 0; 2688 2689 len -= 4; 2690 origlen = len; 2691 /* 2692 * Make sure to allocate a buf that can at least hold a 2693 * conf-nak with an `address' option. We might need it below. 2694 */ 2695 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 2696 if (! buf) 2697 return (0); 2698 2699 /* pass 1: see if we can recognize them */ 2700 if (debug) 2701 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ", 2702 SPP_ARGS(ifp)); 2703 p = (void*) (h+1); 2704 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2705 if (debug) 2706 log(-1, " %s ", sppp_ipcp_opt_name(*p)); 2707 switch (*p) { 2708 case IPCP_OPT_ADDRESS: 2709 if (len >= 6 && p[1] == 6) { 2710 /* correctly formed address option */ 2711 continue; 2712 } 2713 if (debug) 2714 log(-1, "[invalid] "); 2715 break; 2716 default: 2717 /* Others not supported. */ 2718 if (debug) 2719 log(-1, "[rej] "); 2720 break; 2721 } 2722 /* Add the option to rejected list. */ 2723 bcopy (p, r, p[1]); 2724 r += p[1]; 2725 rlen += p[1]; 2726 } 2727 if (rlen) { 2728 if (debug) 2729 log(-1, " send conf-rej\n"); 2730 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf); 2731 return 0; 2732 } else if (debug) 2733 log(-1, "\n"); 2734 2735 /* pass 2: parse option values */ 2736 sppp_get_ip_addrs(sp, 0, &hisaddr, 0); 2737 if (debug) 2738 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ", 2739 SPP_ARGS(ifp)); 2740 p = (void*) (h+1); 2741 len = origlen; 2742 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 2743 if (debug) 2744 log(-1, " %s ", sppp_ipcp_opt_name(*p)); 2745 switch (*p) { 2746 case IPCP_OPT_ADDRESS: 2747 /* This is the address he wants in his end */ 2748 desiredaddr = p[2] << 24 | p[3] << 16 | 2749 p[4] << 8 | p[5]; 2750 if (desiredaddr == hisaddr || 2751 (hisaddr == 1 && desiredaddr != 0)) { 2752 /* 2753 * Peer's address is same as our value, 2754 * or we have set it to 0.0.0.1 to 2755 * indicate that we do not really care, 2756 * this is agreeable. Gonna conf-ack 2757 * it. 2758 */ 2759 if (debug) 2760 log(-1, "%s [ack] ", 2761 sppp_dotted_quad(hisaddr)); 2762 /* record that we've seen it already */ 2763 sp->ipcp.flags |= IPCP_HISADDR_SEEN; 2764 continue; 2765 } 2766 /* 2767 * The address wasn't agreeable. This is either 2768 * he sent us 0.0.0.0, asking to assign him an 2769 * address, or he send us another address not 2770 * matching our value. Either case, we gonna 2771 * conf-nak it with our value. 2772 * XXX: we should "rej" if hisaddr == 0 2773 */ 2774 if (debug) { 2775 if (desiredaddr == 0) 2776 log(-1, "[addr requested] "); 2777 else 2778 log(-1, "%s [not agreed] ", 2779 sppp_dotted_quad(desiredaddr)); 2780 2781 } 2782 p[2] = hisaddr >> 24; 2783 p[3] = hisaddr >> 16; 2784 p[4] = hisaddr >> 8; 2785 p[5] = hisaddr; 2786 break; 2787 } 2788 /* Add the option to nak'ed list. */ 2789 bcopy (p, r, p[1]); 2790 r += p[1]; 2791 rlen += p[1]; 2792 } 2793 2794 /* 2795 * If we are about to conf-ack the request, but haven't seen 2796 * his address so far, gonna conf-nak it instead, with the 2797 * `address' option present and our idea of his address being 2798 * filled in there, to request negotiation of both addresses. 2799 * 2800 * XXX This can result in an endless req - nak loop if peer 2801 * doesn't want to send us his address. Q: What should we do 2802 * about it? XXX A: implement the max-failure counter. 2803 */ 2804 if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) { 2805 buf[0] = IPCP_OPT_ADDRESS; 2806 buf[1] = 6; 2807 buf[2] = hisaddr >> 24; 2808 buf[3] = hisaddr >> 16; 2809 buf[4] = hisaddr >> 8; 2810 buf[5] = hisaddr; 2811 rlen = 6; 2812 if (debug) 2813 log(-1, "still need hisaddr "); 2814 } 2815 2816 if (rlen) { 2817 if (debug) 2818 log(-1, " send conf-nak\n"); 2819 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf); 2820 } else { 2821 if (debug) 2822 log(-1, " send conf-ack\n"); 2823 sppp_cp_send (sp, PPP_IPCP, CONF_ACK, 2824 h->ident, origlen, h+1); 2825 } 2826 2827 free (buf, M_TEMP); 2828 return (rlen == 0); 2829} 2830 2831/* 2832 * Analyze the IPCP Configure-Reject option list, and adjust our 2833 * negotiation. 2834 */ 2835static void 2836sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 2837{ 2838 u_char *buf, *p; 2839 struct ifnet *ifp = &sp->pp_if; 2840 int debug = ifp->if_flags & IFF_DEBUG; 2841 2842 len -= 4; 2843 buf = malloc (len, M_TEMP, M_NOWAIT); 2844 if (!buf) 2845 return; 2846 2847 if (debug) 2848 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ", 2849 SPP_ARGS(ifp)); 2850 2851 p = (void*) (h+1); 2852 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2853 if (debug) 2854 log(-1, " %s ", sppp_ipcp_opt_name(*p)); 2855 switch (*p) { 2856 case IPCP_OPT_ADDRESS: 2857 /* 2858 * Peer doesn't grok address option. This is 2859 * bad. XXX Should we better give up here? 2860 * XXX We could try old "addresses" option... 2861 */ 2862 sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS); 2863 break; 2864 } 2865 } 2866 if (debug) 2867 log(-1, "\n"); 2868 free (buf, M_TEMP); 2869 return; 2870} 2871 2872/* 2873 * Analyze the IPCP Configure-NAK option list, and adjust our 2874 * negotiation. 2875 */ 2876static void 2877sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 2878{ 2879 u_char *buf, *p; 2880 struct ifnet *ifp = &sp->pp_if; 2881 int debug = ifp->if_flags & IFF_DEBUG; 2882 u_long wantaddr; 2883 2884 len -= 4; 2885 buf = malloc (len, M_TEMP, M_NOWAIT); 2886 if (!buf) 2887 return; 2888 2889 if (debug) 2890 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ", 2891 SPP_ARGS(ifp)); 2892 2893 p = (void*) (h+1); 2894 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 2895 if (debug) 2896 log(-1, " %s ", sppp_ipcp_opt_name(*p)); 2897 switch (*p) { 2898 case IPCP_OPT_ADDRESS: 2899 /* 2900 * Peer doesn't like our local IP address. See 2901 * if we can do something for him. We'll drop 2902 * him our address then. 2903 */ 2904 if (len >= 6 && p[1] == 6) { 2905 wantaddr = p[2] << 24 | p[3] << 16 | 2906 p[4] << 8 | p[5]; 2907 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS); 2908 if (debug) 2909 log(-1, "[wantaddr %s] ", 2910 sppp_dotted_quad(wantaddr)); 2911 /* 2912 * When doing dynamic address assignment, 2913 * we accept his offer. Otherwise, we 2914 * ignore it and thus continue to negotiate 2915 * our already existing value. 2916 * XXX: Bogus, if he said no once, he'll 2917 * just say no again, might as well die. 2918 */ 2919 if (sp->ipcp.flags & IPCP_MYADDR_DYN) { 2920 sppp_set_ip_addr(sp, wantaddr); 2921 if (debug) 2922 log(-1, "[agree] "); 2923 sp->ipcp.flags |= IPCP_MYADDR_SEEN; 2924 } 2925 } 2926 break; 2927 } 2928 } 2929 if (debug) 2930 log(-1, "\n"); 2931 free (buf, M_TEMP); 2932 return; 2933} 2934 2935static void 2936sppp_ipcp_tlu(struct sppp *sp) 2937{ 2938 /* we are up - notify isdn daemon */ 2939 if (sp->pp_con) 2940 sp->pp_con(sp); 2941} 2942 2943static void 2944sppp_ipcp_tld(struct sppp *sp) 2945{ 2946} 2947 2948static void 2949sppp_ipcp_tls(struct sppp *sp) 2950{ 2951 /* indicate to LCP that it must stay alive */ 2952 sp->lcp.protos |= (1 << IDX_IPCP); 2953} 2954 2955static void 2956sppp_ipcp_tlf(struct sppp *sp) 2957{ 2958 /* we no longer need LCP */ 2959 sp->lcp.protos &= ~(1 << IDX_IPCP); 2960 sppp_lcp_check_and_close(sp); 2961} 2962 2963static void 2964sppp_ipcp_scr(struct sppp *sp) 2965{ 2966 char opt[6 /* compression */ + 6 /* address */]; 2967 u_long ouraddr; 2968 int i = 0; 2969 2970 if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) { 2971 sppp_get_ip_addrs(sp, &ouraddr, 0, 0); 2972 opt[i++] = IPCP_OPT_ADDRESS; 2973 opt[i++] = 6; 2974 opt[i++] = ouraddr >> 24; 2975 opt[i++] = ouraddr >> 16; 2976 opt[i++] = ouraddr >> 8; 2977 opt[i++] = ouraddr; 2978 } 2979 2980 sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP]; 2981 sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt); 2982} 2983 2984/* 2985 *--------------------------------------------------------------------------* 2986 * * 2987 * The IPv6CP implementation. * 2988 * * 2989 *--------------------------------------------------------------------------* 2990 */ 2991 2992#ifdef INET6 2993static void 2994sppp_ipv6cp_init(struct sppp *sp) 2995{ 2996 sp->ipv6cp.opts = 0; 2997 sp->ipv6cp.flags = 0; 2998 sp->state[IDX_IPV6CP] = STATE_INITIAL; 2999 sp->fail_counter[IDX_IPV6CP] = 0; 3000 sp->pp_seq[IDX_IPV6CP] = 0; 3001 sp->pp_rseq[IDX_IPV6CP] = 0; 3002#if defined(__NetBSD__) 3003 callout_init(&sp->ch[IDX_IPV6CP]); 3004#endif 3005#if defined(__FreeBSD__) && __FreeBSD__ >= 3 3006 callout_handle_init(&sp->ch[IDX_IPV6CP]); 3007#endif 3008} 3009 3010static void 3011sppp_ipv6cp_up(struct sppp *sp) 3012{ 3013 sppp_up_event(&ipv6cp, sp); 3014} 3015 3016static void 3017sppp_ipv6cp_down(struct sppp *sp) 3018{ 3019 sppp_down_event(&ipv6cp, sp); 3020} 3021 3022static void 3023sppp_ipv6cp_open(struct sppp *sp) 3024{ 3025 STDDCL; 3026 struct in6_addr myaddr, hisaddr; 3027 3028#ifdef IPV6CP_MYIFID_DYN 3029 sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN); 3030#else 3031 sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN; 3032#endif 3033 3034 sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0); 3035 /* 3036 * If we don't have our address, this probably means our 3037 * interface doesn't want to talk IPv6 at all. (This could 3038 * be the case if somebody wants to speak only IPX, for 3039 * example.) Don't open IPv6CP in this case. 3040 */ 3041 if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) { 3042 /* XXX this message should go away */ 3043 if (debug) 3044 log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n", 3045 SPP_ARGS(ifp)); 3046 return; 3047 } 3048 3049 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3050 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3051 sppp_open_event(&ipv6cp, sp); 3052} 3053 3054static void 3055sppp_ipv6cp_close(struct sppp *sp) 3056{ 3057 sppp_close_event(&ipv6cp, sp); 3058} 3059 3060static void 3061sppp_ipv6cp_TO(void *cookie) 3062{ 3063 sppp_to_event(&ipv6cp, (struct sppp *)cookie); 3064} 3065 3066/* 3067 * Analyze a configure request. Return true if it was agreeable, and 3068 * caused action sca, false if it has been rejected or nak'ed, and 3069 * caused action scn. (The return value is used to make the state 3070 * transition decision in the state automaton.) 3071 */ 3072static int 3073sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3074{ 3075 u_char *buf, *r, *p; 3076 struct ifnet *ifp = &sp->pp_if; 3077 int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG; 3078 struct in6_addr myaddr, desiredaddr, suggestaddr; 3079 int ifidcount; 3080 int type; 3081 int collision, nohisaddr; 3082 3083 len -= 4; 3084 origlen = len; 3085 /* 3086 * Make sure to allocate a buf that can at least hold a 3087 * conf-nak with an `address' option. We might need it below. 3088 */ 3089 buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT); 3090 if (! buf) 3091 return (0); 3092 3093 /* pass 1: see if we can recognize them */ 3094 if (debug) 3095 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:", 3096 SPP_ARGS(ifp)); 3097 p = (void*) (h+1); 3098 ifidcount = 0; 3099 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3100 if (debug) 3101 log(-1, " %s", sppp_ipv6cp_opt_name(*p)); 3102 switch (*p) { 3103 case IPV6CP_OPT_IFID: 3104 if (len >= 10 && p[1] == 10 && ifidcount == 0) { 3105 /* correctly formed address option */ 3106 ifidcount++; 3107 continue; 3108 } 3109 if (debug) 3110 log(-1, " [invalid]"); 3111 break; 3112#ifdef notyet 3113 case IPV6CP_OPT_COMPRESSION: 3114 if (len >= 4 && p[1] >= 4) { 3115 /* correctly formed compress option */ 3116 continue; 3117 } 3118 if (debug) 3119 log(-1, " [invalid]"); 3120 break; 3121#endif 3122 default: 3123 /* Others not supported. */ 3124 if (debug) 3125 log(-1, " [rej]"); 3126 break; 3127 } 3128 /* Add the option to rejected list. */ 3129 bcopy (p, r, p[1]); 3130 r += p[1]; 3131 rlen += p[1]; 3132 } 3133 if (rlen) { 3134 if (debug) 3135 log(-1, " send conf-rej\n"); 3136 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf); 3137 goto end; 3138 } else if (debug) 3139 log(-1, "\n"); 3140 3141 /* pass 2: parse option values */ 3142 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 3143 if (debug) 3144 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ", 3145 SPP_ARGS(ifp)); 3146 p = (void*) (h+1); 3147 len = origlen; 3148 type = CONF_ACK; 3149 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { 3150 if (debug) 3151 log(-1, " %s", sppp_ipv6cp_opt_name(*p)); 3152 switch (*p) { 3153#ifdef notyet 3154 case IPV6CP_OPT_COMPRESSION: 3155 continue; 3156#endif 3157 case IPV6CP_OPT_IFID: 3158 bzero(&desiredaddr, sizeof(desiredaddr)); 3159 bcopy(&p[2], &desiredaddr.s6_addr[8], 8); 3160 collision = (bcmp(&desiredaddr.s6_addr[8], 3161 &myaddr.s6_addr[8], 8) == 0); 3162 nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr); 3163 3164 desiredaddr.s6_addr16[0] = htons(0xfe80); 3165 desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3166 3167 if (!collision && !nohisaddr) { 3168 /* no collision, hisaddr known - Conf-Ack */ 3169 type = CONF_ACK; 3170 3171 if (debug) { 3172 log(-1, " %s [%s]", 3173 ip6_sprintf(&desiredaddr), 3174 sppp_cp_type_name(type)); 3175 } 3176 continue; 3177 } 3178 3179 bzero(&suggestaddr, sizeof(&suggestaddr)); 3180 if (collision && nohisaddr) { 3181 /* collision, hisaddr unknown - Conf-Rej */ 3182 type = CONF_REJ; 3183 bzero(&p[2], 8); 3184 } else { 3185 /* 3186 * - no collision, hisaddr unknown, or 3187 * - collision, hisaddr known 3188 * Conf-Nak, suggest hisaddr 3189 */ 3190 type = CONF_NAK; 3191 sppp_suggest_ip6_addr(sp, &suggestaddr); 3192 bcopy(&suggestaddr.s6_addr[8], &p[2], 8); 3193 } 3194 if (debug) 3195 log(-1, " %s [%s]", ip6_sprintf(&desiredaddr), 3196 sppp_cp_type_name(type)); 3197 break; 3198 } 3199 /* Add the option to nak'ed list. */ 3200 bcopy (p, r, p[1]); 3201 r += p[1]; 3202 rlen += p[1]; 3203 } 3204 3205 if (rlen == 0 && type == CONF_ACK) { 3206 if (debug) 3207 log(-1, " send %s\n", sppp_cp_type_name(type)); 3208 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1); 3209 } else { 3210#ifdef DIAGNOSTIC 3211 if (type == CONF_ACK) 3212 panic("IPv6CP RCR: CONF_ACK with non-zero rlen"); 3213#endif 3214 3215 if (debug) { 3216 log(-1, " send %s suggest %s\n", 3217 sppp_cp_type_name(type), ip6_sprintf(&suggestaddr)); 3218 } 3219 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf); 3220 } 3221 3222 end: 3223 free (buf, M_TEMP); 3224 return (rlen == 0); 3225} 3226 3227/* 3228 * Analyze the IPv6CP Configure-Reject option list, and adjust our 3229 * negotiation. 3230 */ 3231static void 3232sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3233{ 3234 u_char *buf, *p; 3235 struct ifnet *ifp = &sp->pp_if; 3236 int debug = ifp->if_flags & IFF_DEBUG; 3237 3238 len -= 4; 3239 buf = malloc (len, M_TEMP, M_NOWAIT); 3240 if (!buf) 3241 return; 3242 3243 if (debug) 3244 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:", 3245 SPP_ARGS(ifp)); 3246 3247 p = (void*) (h+1); 3248 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3249 if (debug) 3250 log(-1, " %s", sppp_ipv6cp_opt_name(*p)); 3251 switch (*p) { 3252 case IPV6CP_OPT_IFID: 3253 /* 3254 * Peer doesn't grok address option. This is 3255 * bad. XXX Should we better give up here? 3256 */ 3257 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID); 3258 break; 3259#ifdef notyet 3260 case IPV6CP_OPT_COMPRESS: 3261 sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS); 3262 break; 3263#endif 3264 } 3265 } 3266 if (debug) 3267 log(-1, "\n"); 3268 free (buf, M_TEMP); 3269 return; 3270} 3271 3272/* 3273 * Analyze the IPv6CP Configure-NAK option list, and adjust our 3274 * negotiation. 3275 */ 3276static void 3277sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3278{ 3279 u_char *buf, *p; 3280 struct ifnet *ifp = &sp->pp_if; 3281 int debug = ifp->if_flags & IFF_DEBUG; 3282 struct in6_addr suggestaddr; 3283 3284 len -= 4; 3285 buf = malloc (len, M_TEMP, M_NOWAIT); 3286 if (!buf) 3287 return; 3288 3289 if (debug) 3290 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:", 3291 SPP_ARGS(ifp)); 3292 3293 p = (void*) (h+1); 3294 for (; len > 1 && p[1]; len -= p[1], p += p[1]) { 3295 if (debug) 3296 log(-1, " %s", sppp_ipv6cp_opt_name(*p)); 3297 switch (*p) { 3298 case IPV6CP_OPT_IFID: 3299 /* 3300 * Peer doesn't like our local ifid. See 3301 * if we can do something for him. We'll drop 3302 * him our address then. 3303 */ 3304 if (len < 10 || p[1] != 10) 3305 break; 3306 bzero(&suggestaddr, sizeof(suggestaddr)); 3307 suggestaddr.s6_addr16[0] = htons(0xfe80); 3308 suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index); 3309 bcopy(&p[2], &suggestaddr.s6_addr[8], 8); 3310 3311 sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID); 3312 if (debug) 3313 log(-1, " [suggestaddr %s]", 3314 ip6_sprintf(&suggestaddr)); 3315#ifdef IPV6CP_MYIFID_DYN 3316 /* 3317 * When doing dynamic address assignment, 3318 * we accept his offer. 3319 */ 3320 if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) { 3321 struct in6_addr lastsuggest; 3322 /* 3323 * If <suggested myaddr from peer> equals to 3324 * <hisaddr we have suggested last time>, 3325 * we have a collision. generate new random 3326 * ifid. 3327 */ 3328 sppp_suggest_ip6_addr(&lastsuggest); 3329 if (IN6_ARE_ADDR_EQUAL(&suggestaddr, 3330 lastsuggest)) { 3331 if (debug) 3332 log(-1, " [random]"); 3333 sppp_gen_ip6_addr(sp, &suggestaddr); 3334 } 3335 sppp_set_ip6_addr(sp, &suggestaddr, 0); 3336 if (debug) 3337 log(-1, " [agree]"); 3338 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN; 3339 } 3340#else 3341 /* 3342 * Since we do not do dynamic address assignment, 3343 * we ignore it and thus continue to negotiate 3344 * our already existing value. This can possibly 3345 * go into infinite request-reject loop. 3346 * 3347 * This is not likely because we normally use 3348 * ifid based on MAC-address. 3349 * If you have no ethernet card on the node, too bad. 3350 * XXX should we use fail_counter? 3351 */ 3352#endif 3353 break; 3354#ifdef notyet 3355 case IPV6CP_OPT_COMPRESS: 3356 /* 3357 * Peer wants different compression parameters. 3358 */ 3359 break; 3360#endif 3361 } 3362 } 3363 if (debug) 3364 log(-1, "\n"); 3365 free (buf, M_TEMP); 3366 return; 3367} 3368static void 3369sppp_ipv6cp_tlu(struct sppp *sp) 3370{ 3371 /* we are up - notify isdn daemon */ 3372 if (sp->pp_con) 3373 sp->pp_con(sp); 3374} 3375 3376static void 3377sppp_ipv6cp_tld(struct sppp *sp) 3378{ 3379} 3380 3381static void 3382sppp_ipv6cp_tls(struct sppp *sp) 3383{ 3384 /* indicate to LCP that it must stay alive */ 3385 sp->lcp.protos |= (1 << IDX_IPV6CP); 3386} 3387 3388static void 3389sppp_ipv6cp_tlf(struct sppp *sp) 3390{ 3391 3392#if 0 /* need #if 0 to close IPv6CP properly */ 3393 /* we no longer need LCP */ 3394 sp->lcp.protos &= ~(1 << IDX_IPV6CP); 3395 sppp_lcp_check_and_close(sp); 3396#endif 3397} 3398 3399static void 3400sppp_ipv6cp_scr(struct sppp *sp) 3401{ 3402 char opt[10 /* ifid */ + 4 /* compression, minimum */]; 3403 struct in6_addr ouraddr; 3404 int i = 0; 3405 3406 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) { 3407 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0); 3408 opt[i++] = IPV6CP_OPT_IFID; 3409 opt[i++] = 10; 3410 bcopy(&ouraddr.s6_addr[8], &opt[i], 8); 3411 i += 8; 3412 } 3413 3414#ifdef notyet 3415 if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) { 3416 opt[i++] = IPV6CP_OPT_COMPRESSION; 3417 opt[i++] = 4; 3418 opt[i++] = 0; /* TBD */ 3419 opt[i++] = 0; /* TBD */ 3420 /* variable length data may follow */ 3421 } 3422#endif 3423 3424 sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP]; 3425 sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt); 3426} 3427#else /*INET6*/ 3428static void sppp_ipv6cp_init(struct sppp *sp) 3429{ 3430} 3431 3432static void sppp_ipv6cp_up(struct sppp *sp) 3433{ 3434} 3435 3436static void sppp_ipv6cp_down(struct sppp *sp) 3437{ 3438} 3439 3440 3441static void sppp_ipv6cp_open(struct sppp *sp) 3442{ 3443} 3444 3445static void sppp_ipv6cp_close(struct sppp *sp) 3446{ 3447} 3448 3449static void sppp_ipv6cp_TO(void *sp) 3450{ 3451} 3452 3453static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len) 3454{ 3455 return 0; 3456} 3457 3458static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len) 3459{ 3460} 3461 3462static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len) 3463{ 3464} 3465 3466static void sppp_ipv6cp_tlu(struct sppp *sp) 3467{ 3468} 3469 3470static void sppp_ipv6cp_tld(struct sppp *sp) 3471{ 3472} 3473 3474static void sppp_ipv6cp_tls(struct sppp *sp) 3475{ 3476} 3477 3478static void sppp_ipv6cp_tlf(struct sppp *sp) 3479{ 3480} 3481 3482static void sppp_ipv6cp_scr(struct sppp *sp) 3483{ 3484} 3485#endif /*INET6*/ 3486 3487/* 3488 *--------------------------------------------------------------------------* 3489 * * 3490 * The CHAP implementation. * 3491 * * 3492 *--------------------------------------------------------------------------* 3493 */ 3494 3495/* 3496 * The authentication protocols don't employ a full-fledged state machine as 3497 * the control protocols do, since they do have Open and Close events, but 3498 * not Up and Down, nor are they explicitly terminated. Also, use of the 3499 * authentication protocols may be different in both directions (this makes 3500 * sense, think of a machine that never accepts incoming calls but only 3501 * calls out, it doesn't require the called party to authenticate itself). 3502 * 3503 * Our state machine for the local authentication protocol (we are requesting 3504 * the peer to authenticate) looks like: 3505 * 3506 * RCA- 3507 * +--------------------------------------------+ 3508 * V scn,tld| 3509 * +--------+ Close +---------+ RCA+ 3510 * | |<----------------------------------| |------+ 3511 * +--->| Closed | TO* | Opened | sca | 3512 * | | |-----+ +-------| |<-----+ 3513 * | +--------+ irc | | +---------+ 3514 * | ^ | | ^ 3515 * | | | | | 3516 * | | | | | 3517 * | TO-| | | | 3518 * | |tld TO+ V | | 3519 * | | +------->+ | | 3520 * | | | | | | 3521 * | +--------+ V | | 3522 * | | |<----+<--------------------+ | 3523 * | | Req- | scr | 3524 * | | Sent | | 3525 * | | | | 3526 * | +--------+ | 3527 * | RCA- | | RCA+ | 3528 * +------+ +------------------------------------------+ 3529 * scn,tld sca,irc,ict,tlu 3530 * 3531 * 3532 * with: 3533 * 3534 * Open: LCP reached authentication phase 3535 * Close: LCP reached terminate phase 3536 * 3537 * RCA+: received reply (pap-req, chap-response), acceptable 3538 * RCN: received reply (pap-req, chap-response), not acceptable 3539 * TO+: timeout with restart counter >= 0 3540 * TO-: timeout with restart counter < 0 3541 * TO*: reschedule timeout for CHAP 3542 * 3543 * scr: send request packet (none for PAP, chap-challenge) 3544 * sca: send ack packet (pap-ack, chap-success) 3545 * scn: send nak packet (pap-nak, chap-failure) 3546 * ict: initialize re-challenge timer (CHAP only) 3547 * 3548 * tlu: this-layer-up, LCP reaches network phase 3549 * tld: this-layer-down, LCP enters terminate phase 3550 * 3551 * Note that in CHAP mode, after sending a new challenge, while the state 3552 * automaton falls back into Req-Sent state, it doesn't signal a tld 3553 * event to LCP, so LCP remains in network phase. Only after not getting 3554 * any response (or after getting an unacceptable response), CHAP closes, 3555 * causing LCP to enter terminate phase. 3556 * 3557 * With PAP, there is no initial request that can be sent. The peer is 3558 * expected to send one based on the successful negotiation of PAP as 3559 * the authentication protocol during the LCP option negotiation. 3560 * 3561 * Incoming authentication protocol requests (remote requests 3562 * authentication, we are peer) don't employ a state machine at all, 3563 * they are simply answered. Some peers [Ascend P50 firmware rev 3564 * 4.50] react allergically when sending IPCP requests while they are 3565 * still in authentication phase (thereby violating the standard that 3566 * demands that these NCP packets are to be discarded), so we keep 3567 * track of the peer demanding us to authenticate, and only proceed to 3568 * phase network once we've seen a positive acknowledge for the 3569 * authentication. 3570 */ 3571 3572/* 3573 * Handle incoming CHAP packets. 3574 */ 3575void 3576sppp_chap_input(struct sppp *sp, struct mbuf *m) 3577{ 3578 STDDCL; 3579 struct lcp_header *h; 3580 int len, x; 3581 u_char *value, *name, digest[AUTHKEYLEN], dsize; 3582 int value_len, name_len; 3583 MD5_CTX ctx; 3584 3585 len = m->m_pkthdr.len; 3586 if (len < 4) { 3587 if (debug) 3588 log(LOG_DEBUG, 3589 SPP_FMT "chap invalid packet length: %d bytes\n", 3590 SPP_ARGS(ifp), len); 3591 return; 3592 } 3593 h = mtod (m, struct lcp_header*); 3594 if (len > ntohs (h->len)) 3595 len = ntohs (h->len); 3596 3597 switch (h->type) { 3598 /* challenge, failure and success are his authproto */ 3599 case CHAP_CHALLENGE: 3600 value = 1 + (u_char*)(h+1); 3601 value_len = value[-1]; 3602 name = value + value_len; 3603 name_len = len - value_len - 5; 3604 if (name_len < 0) { 3605 if (debug) { 3606 log(LOG_DEBUG, 3607 SPP_FMT "chap corrupted challenge " 3608 "<%s id=0x%x len=%d", 3609 SPP_ARGS(ifp), 3610 sppp_auth_type_name(PPP_CHAP, h->type), 3611 h->ident, ntohs(h->len)); 3612 sppp_print_bytes((u_char*) (h+1), len-4); 3613 log(-1, ">\n"); 3614 } 3615 break; 3616 } 3617 3618 if (debug) { 3619 log(LOG_DEBUG, 3620 SPP_FMT "chap input <%s id=0x%x len=%d name=", 3621 SPP_ARGS(ifp), 3622 sppp_auth_type_name(PPP_CHAP, h->type), h->ident, 3623 ntohs(h->len)); 3624 sppp_print_string((char*) name, name_len); 3625 log(-1, " value-size=%d value=", value_len); 3626 sppp_print_bytes(value, value_len); 3627 log(-1, ">\n"); 3628 } 3629 3630 /* Compute reply value. */ 3631 MD5Init(&ctx); 3632 MD5Update(&ctx, &h->ident, 1); 3633 MD5Update(&ctx, sp->myauth.secret, 3634 sppp_strnlen(sp->myauth.secret, AUTHKEYLEN)); 3635 MD5Update(&ctx, value, value_len); 3636 MD5Final(digest, &ctx); 3637 dsize = sizeof digest; 3638 3639 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident, 3640 sizeof dsize, (const char *)&dsize, 3641 sizeof digest, digest, 3642 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 3643 sp->myauth.name, 3644 0); 3645 break; 3646 3647 case CHAP_SUCCESS: 3648 if (debug) { 3649 log(LOG_DEBUG, SPP_FMT "chap success", 3650 SPP_ARGS(ifp)); 3651 if (len > 4) { 3652 log(-1, ": "); 3653 sppp_print_string((char*)(h + 1), len - 4); 3654 } 3655 log(-1, "\n"); 3656 } 3657 x = splimp(); 3658 sp->pp_flags &= ~PP_NEEDAUTH; 3659 if (sp->myauth.proto == PPP_CHAP && 3660 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 3661 (sp->lcp.protos & (1 << IDX_CHAP)) == 0) { 3662 /* 3663 * We are authenticator for CHAP but didn't 3664 * complete yet. Leave it to tlu to proceed 3665 * to network phase. 3666 */ 3667 splx(x); 3668 break; 3669 } 3670 splx(x); 3671 sppp_phase_network(sp); 3672 break; 3673 3674 case CHAP_FAILURE: 3675 if (debug) { 3676 log(LOG_INFO, SPP_FMT "chap failure", 3677 SPP_ARGS(ifp)); 3678 if (len > 4) { 3679 log(-1, ": "); 3680 sppp_print_string((char*)(h + 1), len - 4); 3681 } 3682 log(-1, "\n"); 3683 } else 3684 log(LOG_INFO, SPP_FMT "chap failure\n", 3685 SPP_ARGS(ifp)); 3686 /* await LCP shutdown by authenticator */ 3687 break; 3688 3689 /* response is my authproto */ 3690 case CHAP_RESPONSE: 3691 value = 1 + (u_char*)(h+1); 3692 value_len = value[-1]; 3693 name = value + value_len; 3694 name_len = len - value_len - 5; 3695 if (name_len < 0) { 3696 if (debug) { 3697 log(LOG_DEBUG, 3698 SPP_FMT "chap corrupted response " 3699 "<%s id=0x%x len=%d", 3700 SPP_ARGS(ifp), 3701 sppp_auth_type_name(PPP_CHAP, h->type), 3702 h->ident, ntohs(h->len)); 3703 sppp_print_bytes((u_char*)(h+1), len-4); 3704 log(-1, ">\n"); 3705 } 3706 break; 3707 } 3708 if (h->ident != sp->confid[IDX_CHAP]) { 3709 if (debug) 3710 log(LOG_DEBUG, 3711 SPP_FMT "chap dropping response for old ID " 3712 "(got %d, expected %d)\n", 3713 SPP_ARGS(ifp), 3714 h->ident, sp->confid[IDX_CHAP]); 3715 break; 3716 } 3717 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) 3718 || bcmp(name, sp->hisauth.name, name_len) != 0) { 3719 log(LOG_INFO, SPP_FMT "chap response, his name ", 3720 SPP_ARGS(ifp)); 3721 sppp_print_string(name, name_len); 3722 log(-1, " != expected "); 3723 sppp_print_string(sp->hisauth.name, 3724 sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)); 3725 log(-1, "\n"); 3726 } 3727 if (debug) { 3728 log(LOG_DEBUG, SPP_FMT "chap input(%s) " 3729 "<%s id=0x%x len=%d name=", 3730 SPP_ARGS(ifp), 3731 sppp_state_name(sp->state[IDX_CHAP]), 3732 sppp_auth_type_name(PPP_CHAP, h->type), 3733 h->ident, ntohs (h->len)); 3734 sppp_print_string((char*)name, name_len); 3735 log(-1, " value-size=%d value=", value_len); 3736 sppp_print_bytes(value, value_len); 3737 log(-1, ">\n"); 3738 } 3739 if (value_len != AUTHKEYLEN) { 3740 if (debug) 3741 log(LOG_DEBUG, 3742 SPP_FMT "chap bad hash value length: " 3743 "%d bytes, should be %d\n", 3744 SPP_ARGS(ifp), value_len, 3745 AUTHKEYLEN); 3746 break; 3747 } 3748 3749 MD5Init(&ctx); 3750 MD5Update(&ctx, &h->ident, 1); 3751 MD5Update(&ctx, sp->hisauth.secret, 3752 sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN)); 3753 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN); 3754 MD5Final(digest, &ctx); 3755 3756#define FAILMSG "Failed..." 3757#define SUCCMSG "Welcome!" 3758 3759 if (value_len != sizeof digest || 3760 bcmp(digest, value, value_len) != 0) { 3761 /* action scn, tld */ 3762 sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident, 3763 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 3764 0); 3765 chap.tld(sp); 3766 break; 3767 } 3768 /* action sca, perhaps tlu */ 3769 if (sp->state[IDX_CHAP] == STATE_REQ_SENT || 3770 sp->state[IDX_CHAP] == STATE_OPENED) 3771 sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident, 3772 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 3773 0); 3774 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) { 3775 sppp_cp_change_state(&chap, sp, STATE_OPENED); 3776 chap.tlu(sp); 3777 } 3778 break; 3779 3780 default: 3781 /* Unknown CHAP packet type -- ignore. */ 3782 if (debug) { 3783 log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) " 3784 "<0x%x id=0x%xh len=%d", 3785 SPP_ARGS(ifp), 3786 sppp_state_name(sp->state[IDX_CHAP]), 3787 h->type, h->ident, ntohs(h->len)); 3788 sppp_print_bytes((u_char*)(h+1), len-4); 3789 log(-1, ">\n"); 3790 } 3791 break; 3792 3793 } 3794} 3795 3796static void 3797sppp_chap_init(struct sppp *sp) 3798{ 3799 /* Chap doesn't have STATE_INITIAL at all. */ 3800 sp->state[IDX_CHAP] = STATE_CLOSED; 3801 sp->fail_counter[IDX_CHAP] = 0; 3802 sp->pp_seq[IDX_CHAP] = 0; 3803 sp->pp_rseq[IDX_CHAP] = 0; 3804#if defined(__FreeBSD__) && __FreeBSD__ >= 3 3805 callout_handle_init(&sp->ch[IDX_CHAP]); 3806#endif 3807} 3808 3809static void 3810sppp_chap_open(struct sppp *sp) 3811{ 3812 if (sp->myauth.proto == PPP_CHAP && 3813 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 3814 /* we are authenticator for CHAP, start it */ 3815 chap.scr(sp); 3816 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3817 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3818 } 3819 /* nothing to be done if we are peer, await a challenge */ 3820} 3821 3822static void 3823sppp_chap_close(struct sppp *sp) 3824{ 3825 if (sp->state[IDX_CHAP] != STATE_CLOSED) 3826 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3827} 3828 3829static void 3830sppp_chap_TO(void *cookie) 3831{ 3832 struct sppp *sp = (struct sppp *)cookie; 3833 STDDCL; 3834 int s; 3835 3836 s = splimp(); 3837 if (debug) 3838 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n", 3839 SPP_ARGS(ifp), 3840 sppp_state_name(sp->state[IDX_CHAP]), 3841 sp->rst_counter[IDX_CHAP]); 3842 3843 if (--sp->rst_counter[IDX_CHAP] < 0) 3844 /* TO- event */ 3845 switch (sp->state[IDX_CHAP]) { 3846 case STATE_REQ_SENT: 3847 chap.tld(sp); 3848 sppp_cp_change_state(&chap, sp, STATE_CLOSED); 3849 break; 3850 } 3851 else 3852 /* TO+ (or TO*) event */ 3853 switch (sp->state[IDX_CHAP]) { 3854 case STATE_OPENED: 3855 /* TO* event */ 3856 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3857 /* fall through */ 3858 case STATE_REQ_SENT: 3859 chap.scr(sp); 3860 /* sppp_cp_change_state() will restart the timer */ 3861 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT); 3862 break; 3863 } 3864 3865 splx(s); 3866} 3867 3868static void 3869sppp_chap_tlu(struct sppp *sp) 3870{ 3871 STDDCL; 3872 int i, x; 3873 3874 i = 0; 3875 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure; 3876 3877 /* 3878 * Some broken CHAP implementations (Conware CoNet, firmware 3879 * 4.0.?) don't want to re-authenticate their CHAP once the 3880 * initial challenge-response exchange has taken place. 3881 * Provide for an option to avoid rechallenges. 3882 */ 3883 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) { 3884 /* 3885 * Compute the re-challenge timeout. This will yield 3886 * a number between 300 and 810 seconds. 3887 */ 3888 i = 300 + ((unsigned)(random() & 0xff00) >> 7); 3889 TIMEOUT(chap.TO, (void *)sp, i * hz, sp->ch[IDX_CHAP]); 3890 } 3891 3892 if (debug) { 3893 log(LOG_DEBUG, 3894 SPP_FMT "chap %s, ", 3895 SPP_ARGS(ifp), 3896 sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu"); 3897 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) 3898 log(-1, "next re-challenge in %d seconds\n", i); 3899 else 3900 log(-1, "re-challenging supressed\n"); 3901 } 3902 3903 x = splimp(); 3904 /* indicate to LCP that we need to be closed down */ 3905 sp->lcp.protos |= (1 << IDX_CHAP); 3906 3907 if (sp->pp_flags & PP_NEEDAUTH) { 3908 /* 3909 * Remote is authenticator, but his auth proto didn't 3910 * complete yet. Defer the transition to network 3911 * phase. 3912 */ 3913 splx(x); 3914 return; 3915 } 3916 splx(x); 3917 3918 /* 3919 * If we are already in phase network, we are done here. This 3920 * is the case if this is a dummy tlu event after a re-challenge. 3921 */ 3922 if (sp->pp_phase != PHASE_NETWORK) 3923 sppp_phase_network(sp); 3924} 3925 3926static void 3927sppp_chap_tld(struct sppp *sp) 3928{ 3929 STDDCL; 3930 3931 if (debug) 3932 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp)); 3933 UNTIMEOUT(chap.TO, (void *)sp, sp->ch[IDX_CHAP]); 3934 sp->lcp.protos &= ~(1 << IDX_CHAP); 3935 3936 lcp.Close(sp); 3937} 3938 3939static void 3940sppp_chap_scr(struct sppp *sp) 3941{ 3942 u_long *ch, seed; 3943 u_char clen; 3944 3945 /* Compute random challenge. */ 3946 ch = (u_long *)sp->myauth.challenge; 3947#if defined(__FreeBSD__) && __FreeBSD__ >= 3 3948 read_random(&seed, sizeof seed); 3949#else 3950 { 3951 struct timeval tv; 3952 microtime(&tv); 3953 seed = tv.tv_sec ^ tv.tv_usec; 3954 } 3955#endif 3956 ch[0] = seed ^ random(); 3957 ch[1] = seed ^ random(); 3958 ch[2] = seed ^ random(); 3959 ch[3] = seed ^ random(); 3960 clen = AUTHKEYLEN; 3961 3962 sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP]; 3963 3964 sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP], 3965 sizeof clen, (const char *)&clen, 3966 (size_t)AUTHKEYLEN, sp->myauth.challenge, 3967 (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN), 3968 sp->myauth.name, 3969 0); 3970} 3971 3972/* 3973 *--------------------------------------------------------------------------* 3974 * * 3975 * The PAP implementation. * 3976 * * 3977 *--------------------------------------------------------------------------* 3978 */ 3979/* 3980 * For PAP, we need to keep a little state also if we are the peer, not the 3981 * authenticator. This is since we don't get a request to authenticate, but 3982 * have to repeatedly authenticate ourself until we got a response (or the 3983 * retry counter is expired). 3984 */ 3985 3986/* 3987 * Handle incoming PAP packets. */ 3988static void 3989sppp_pap_input(struct sppp *sp, struct mbuf *m) 3990{ 3991 STDDCL; 3992 struct lcp_header *h; 3993 int len, x; 3994 u_char *name, *passwd, mlen; 3995 int name_len, passwd_len; 3996 3997 len = m->m_pkthdr.len; 3998 if (len < 5) { 3999 if (debug) 4000 log(LOG_DEBUG, 4001 SPP_FMT "pap invalid packet length: %d bytes\n", 4002 SPP_ARGS(ifp), len); 4003 return; 4004 } 4005 h = mtod (m, struct lcp_header*); 4006 if (len > ntohs (h->len)) 4007 len = ntohs (h->len); 4008 switch (h->type) { 4009 /* PAP request is my authproto */ 4010 case PAP_REQ: 4011 name = 1 + (u_char*)(h+1); 4012 name_len = name[-1]; 4013 passwd = name + name_len + 1; 4014 if (name_len > len - 6 || 4015 (passwd_len = passwd[-1]) > len - 6 - name_len) { 4016 if (debug) { 4017 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4018 "<%s id=0x%x len=%d", 4019 SPP_ARGS(ifp), 4020 sppp_auth_type_name(PPP_PAP, h->type), 4021 h->ident, ntohs(h->len)); 4022 sppp_print_bytes((u_char*)(h+1), len-4); 4023 log(-1, ">\n"); 4024 } 4025 break; 4026 } 4027 if (debug) { 4028 log(LOG_DEBUG, SPP_FMT "pap input(%s) " 4029 "<%s id=0x%x len=%d name=", 4030 SPP_ARGS(ifp), 4031 sppp_state_name(sp->state[IDX_PAP]), 4032 sppp_auth_type_name(PPP_PAP, h->type), 4033 h->ident, ntohs(h->len)); 4034 sppp_print_string((char*)name, name_len); 4035 log(-1, " passwd="); 4036 sppp_print_string((char*)passwd, passwd_len); 4037 log(-1, ">\n"); 4038 } 4039 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) || 4040 passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) || 4041 bcmp(name, sp->hisauth.name, name_len) != 0 || 4042 bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) { 4043 /* action scn, tld */ 4044 mlen = sizeof(FAILMSG) - 1; 4045 sppp_auth_send(&pap, sp, PAP_NAK, h->ident, 4046 sizeof mlen, (const char *)&mlen, 4047 sizeof(FAILMSG) - 1, (u_char *)FAILMSG, 4048 0); 4049 pap.tld(sp); 4050 break; 4051 } 4052 /* action sca, perhaps tlu */ 4053 if (sp->state[IDX_PAP] == STATE_REQ_SENT || 4054 sp->state[IDX_PAP] == STATE_OPENED) { 4055 mlen = sizeof(SUCCMSG) - 1; 4056 sppp_auth_send(&pap, sp, PAP_ACK, h->ident, 4057 sizeof mlen, (const char *)&mlen, 4058 sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG, 4059 0); 4060 } 4061 if (sp->state[IDX_PAP] == STATE_REQ_SENT) { 4062 sppp_cp_change_state(&pap, sp, STATE_OPENED); 4063 pap.tlu(sp); 4064 } 4065 break; 4066 4067 /* ack and nak are his authproto */ 4068 case PAP_ACK: 4069 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 4070 if (debug) { 4071 log(LOG_DEBUG, SPP_FMT "pap success", 4072 SPP_ARGS(ifp)); 4073 name_len = *((char *)h); 4074 if (len > 5 && name_len) { 4075 log(-1, ": "); 4076 sppp_print_string((char*)(h+1), name_len); 4077 } 4078 log(-1, "\n"); 4079 } 4080 x = splimp(); 4081 sp->pp_flags &= ~PP_NEEDAUTH; 4082 if (sp->myauth.proto == PPP_PAP && 4083 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) && 4084 (sp->lcp.protos & (1 << IDX_PAP)) == 0) { 4085 /* 4086 * We are authenticator for PAP but didn't 4087 * complete yet. Leave it to tlu to proceed 4088 * to network phase. 4089 */ 4090 splx(x); 4091 break; 4092 } 4093 splx(x); 4094 sppp_phase_network(sp); 4095 break; 4096 4097 case PAP_NAK: 4098 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 4099 if (debug) { 4100 log(LOG_INFO, SPP_FMT "pap failure", 4101 SPP_ARGS(ifp)); 4102 name_len = *((char *)h); 4103 if (len > 5 && name_len) { 4104 log(-1, ": "); 4105 sppp_print_string((char*)(h+1), name_len); 4106 } 4107 log(-1, "\n"); 4108 } else 4109 log(LOG_INFO, SPP_FMT "pap failure\n", 4110 SPP_ARGS(ifp)); 4111 /* await LCP shutdown by authenticator */ 4112 break; 4113 4114 default: 4115 /* Unknown PAP packet type -- ignore. */ 4116 if (debug) { 4117 log(LOG_DEBUG, SPP_FMT "pap corrupted input " 4118 "<0x%x id=0x%x len=%d", 4119 SPP_ARGS(ifp), 4120 h->type, h->ident, ntohs(h->len)); 4121 sppp_print_bytes((u_char*)(h+1), len-4); 4122 log(-1, ">\n"); 4123 } 4124 break; 4125 4126 } 4127} 4128 4129static void 4130sppp_pap_init(struct sppp *sp) 4131{ 4132 /* PAP doesn't have STATE_INITIAL at all. */ 4133 sp->state[IDX_PAP] = STATE_CLOSED; 4134 sp->fail_counter[IDX_PAP] = 0; 4135 sp->pp_seq[IDX_PAP] = 0; 4136 sp->pp_rseq[IDX_PAP] = 0; 4137#if defined(__FreeBSD__) && __FreeBSD__ >= 3 4138 callout_handle_init(&sp->ch[IDX_PAP]); 4139 callout_handle_init(&sp->pap_my_to_ch); 4140#endif 4141} 4142 4143static void 4144sppp_pap_open(struct sppp *sp) 4145{ 4146 if (sp->hisauth.proto == PPP_PAP && 4147 (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) { 4148 /* we are authenticator for PAP, start our timer */ 4149 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4150 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4151 } 4152 if (sp->myauth.proto == PPP_PAP) { 4153 /* we are peer, send a request, and start a timer */ 4154 pap.scr(sp); 4155 TIMEOUT(sppp_pap_my_TO, (void *)sp, sp->lcp.timeout, 4156 sp->pap_my_to_ch); 4157 } 4158} 4159 4160static void 4161sppp_pap_close(struct sppp *sp) 4162{ 4163 if (sp->state[IDX_PAP] != STATE_CLOSED) 4164 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4165} 4166 4167/* 4168 * That's the timeout routine if we are authenticator. Since the 4169 * authenticator is basically passive in PAP, we can't do much here. 4170 */ 4171static void 4172sppp_pap_TO(void *cookie) 4173{ 4174 struct sppp *sp = (struct sppp *)cookie; 4175 STDDCL; 4176 int s; 4177 4178 s = splimp(); 4179 if (debug) 4180 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n", 4181 SPP_ARGS(ifp), 4182 sppp_state_name(sp->state[IDX_PAP]), 4183 sp->rst_counter[IDX_PAP]); 4184 4185 if (--sp->rst_counter[IDX_PAP] < 0) 4186 /* TO- event */ 4187 switch (sp->state[IDX_PAP]) { 4188 case STATE_REQ_SENT: 4189 pap.tld(sp); 4190 sppp_cp_change_state(&pap, sp, STATE_CLOSED); 4191 break; 4192 } 4193 else 4194 /* TO+ event, not very much we could do */ 4195 switch (sp->state[IDX_PAP]) { 4196 case STATE_REQ_SENT: 4197 /* sppp_cp_change_state() will restart the timer */ 4198 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT); 4199 break; 4200 } 4201 4202 splx(s); 4203} 4204 4205/* 4206 * That's the timeout handler if we are peer. Since the peer is active, 4207 * we need to retransmit our PAP request since it is apparently lost. 4208 * XXX We should impose a max counter. 4209 */ 4210static void 4211sppp_pap_my_TO(void *cookie) 4212{ 4213 struct sppp *sp = (struct sppp *)cookie; 4214 STDDCL; 4215 4216 if (debug) 4217 log(LOG_DEBUG, SPP_FMT "pap peer TO\n", 4218 SPP_ARGS(ifp)); 4219 4220 pap.scr(sp); 4221} 4222 4223static void 4224sppp_pap_tlu(struct sppp *sp) 4225{ 4226 STDDCL; 4227 int x; 4228 4229 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure; 4230 4231 if (debug) 4232 log(LOG_DEBUG, SPP_FMT "%s tlu\n", 4233 SPP_ARGS(ifp), pap.name); 4234 4235 x = splimp(); 4236 /* indicate to LCP that we need to be closed down */ 4237 sp->lcp.protos |= (1 << IDX_PAP); 4238 4239 if (sp->pp_flags & PP_NEEDAUTH) { 4240 /* 4241 * Remote is authenticator, but his auth proto didn't 4242 * complete yet. Defer the transition to network 4243 * phase. 4244 */ 4245 splx(x); 4246 return; 4247 } 4248 splx(x); 4249 sppp_phase_network(sp); 4250} 4251 4252static void 4253sppp_pap_tld(struct sppp *sp) 4254{ 4255 STDDCL; 4256 4257 if (debug) 4258 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp)); 4259 UNTIMEOUT(pap.TO, (void *)sp, sp->ch[IDX_PAP]); 4260 UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch); 4261 sp->lcp.protos &= ~(1 << IDX_PAP); 4262 4263 lcp.Close(sp); 4264} 4265 4266static void 4267sppp_pap_scr(struct sppp *sp) 4268{ 4269 u_char idlen, pwdlen; 4270 4271 sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP]; 4272 pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN); 4273 idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN); 4274 4275 sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP], 4276 sizeof idlen, (const char *)&idlen, 4277 (size_t)idlen, sp->myauth.name, 4278 sizeof pwdlen, (const char *)&pwdlen, 4279 (size_t)pwdlen, sp->myauth.secret, 4280 0); 4281} 4282 4283/* 4284 * Random miscellaneous functions. 4285 */ 4286 4287/* 4288 * Send a PAP or CHAP proto packet. 4289 * 4290 * Varadic function, each of the elements for the ellipsis is of type 4291 * ``size_t mlen, const u_char *msg''. Processing will stop iff 4292 * mlen == 0. 4293 * NOTE: never declare variadic functions with types subject to type 4294 * promotion (i.e. u_char). This is asking for big trouble depending 4295 * on the architecture you are on... 4296 */ 4297 4298static void 4299sppp_auth_send(const struct cp *cp, struct sppp *sp, 4300 unsigned int type, unsigned int id, 4301 ...) 4302{ 4303 STDDCL; 4304 struct ppp_header *h; 4305 struct lcp_header *lh; 4306 struct mbuf *m; 4307 u_char *p; 4308 int len; 4309 unsigned int mlen; 4310 const char *msg; 4311 va_list ap; 4312 4313 MGETHDR (m, M_DONTWAIT, MT_DATA); 4314 if (! m) 4315 return; 4316 m->m_pkthdr.rcvif = 0; 4317 4318 h = mtod (m, struct ppp_header*); 4319 h->address = PPP_ALLSTATIONS; /* broadcast address */ 4320 h->control = PPP_UI; /* Unnumbered Info */ 4321 h->protocol = htons(cp->proto); 4322 4323 lh = (struct lcp_header*)(h + 1); 4324 lh->type = type; 4325 lh->ident = id; 4326 p = (u_char*) (lh+1); 4327 4328 va_start(ap, id); 4329 len = 0; 4330 4331 while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) { 4332 msg = va_arg(ap, const char *); 4333 len += mlen; 4334 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) { 4335 va_end(ap); 4336 m_freem(m); 4337 return; 4338 } 4339 4340 bcopy(msg, p, mlen); 4341 p += mlen; 4342 } 4343 va_end(ap); 4344 4345 m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len; 4346 lh->len = htons (LCP_HEADER_LEN + len); 4347 4348 if (debug) { 4349 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d", 4350 SPP_ARGS(ifp), cp->name, 4351 sppp_auth_type_name(cp->proto, lh->type), 4352 lh->ident, ntohs(lh->len)); 4353 sppp_print_bytes((u_char*) (lh+1), len); 4354 log(-1, ">\n"); 4355 } 4356 if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3)) 4357 ifp->if_oerrors++; 4358} 4359 4360/* 4361 * Flush interface queue. 4362 */ 4363static void 4364sppp_qflush(struct ifqueue *ifq) 4365{ 4366 struct mbuf *m, *n; 4367 4368 n = ifq->ifq_head; 4369 while ((m = n)) { 4370 n = m->m_act; 4371 m_freem (m); 4372 } 4373 ifq->ifq_head = 0; 4374 ifq->ifq_tail = 0; 4375 ifq->ifq_len = 0; 4376} 4377 4378/* 4379 * Send keepalive packets, every 10 seconds. 4380 */ 4381static void 4382sppp_keepalive(void *dummy) 4383{ 4384 struct sppp *sp; 4385 int s; 4386 4387 s = splimp(); 4388 for (sp=spppq; sp; sp=sp->pp_next) { 4389 struct ifnet *ifp = &sp->pp_if; 4390 4391 /* Keepalive mode disabled or channel down? */ 4392 if (! (sp->pp_flags & PP_KEEPALIVE) || 4393 ! (ifp->if_flags & IFF_RUNNING)) 4394 continue; 4395 4396 /* No keepalive in PPP mode if LCP not opened yet. */ 4397 if (sp->pp_mode != IFF_CISCO && 4398 sp->pp_phase < PHASE_AUTHENTICATE) 4399 continue; 4400 4401 if (sp->pp_alivecnt == MAXALIVECNT) { 4402 /* No keepalive packets got. Stop the interface. */ 4403 printf (SPP_FMT "down\n", SPP_ARGS(ifp)); 4404 if_down (ifp); 4405 sppp_qflush (&sp->pp_cpq); 4406 if (sp->pp_mode != IFF_CISCO) { 4407 /* XXX */ 4408 /* Shut down the PPP link. */ 4409 lcp.Down(sp); 4410 /* Initiate negotiation. XXX */ 4411 lcp.Up(sp); 4412 } 4413 } 4414 if (sp->pp_alivecnt <= MAXALIVECNT) 4415 ++sp->pp_alivecnt; 4416 if (sp->pp_mode == IFF_CISCO) 4417 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, 4418 ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]); 4419 else if (sp->pp_phase >= PHASE_AUTHENTICATE) { 4420 long nmagic = htonl (sp->lcp.magic); 4421 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP]; 4422 sppp_cp_send (sp, PPP_LCP, ECHO_REQ, 4423 sp->lcp.echoid, 4, &nmagic); 4424 } 4425 } 4426 splx(s); 4427 TIMEOUT(sppp_keepalive, 0, hz * 10, keepalive_ch); 4428} 4429 4430/* 4431 * Get both IP addresses. 4432 */ 4433static void 4434sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask) 4435{ 4436 struct ifnet *ifp = &sp->pp_if; 4437 struct ifaddr *ifa; 4438 struct sockaddr_in *si, *sm; 4439 u_long ssrc, ddst; 4440 4441 sm = NULL; 4442 ssrc = ddst = 0L; 4443 /* 4444 * Pick the first AF_INET address from the list, 4445 * aliases don't make any sense on a p2p link anyway. 4446 */ 4447 si = 0; 4448#if defined(__FreeBSD__) && __FreeBSD__ >= 3 4449 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 4450#elif defined(__NetBSD__) || defined (__OpenBSD__) 4451 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); 4452 ifa; 4453 ifa = TAILQ_NEXT(ifa, ifa_list)) 4454#else 4455 for (ifa = ifp->if_addrlist; 4456 ifa; 4457 ifa = ifa->ifa_next) 4458#endif 4459 if (ifa->ifa_addr->sa_family == AF_INET) { 4460 si = (struct sockaddr_in *)ifa->ifa_addr; 4461 sm = (struct sockaddr_in *)ifa->ifa_netmask; 4462 if (si) 4463 break; 4464 } 4465 if (ifa) { 4466 if (si && si->sin_addr.s_addr) { 4467 ssrc = si->sin_addr.s_addr; 4468 if (srcmask) 4469 *srcmask = ntohl(sm->sin_addr.s_addr); 4470 } 4471 4472 si = (struct sockaddr_in *)ifa->ifa_dstaddr; 4473 if (si && si->sin_addr.s_addr) 4474 ddst = si->sin_addr.s_addr; 4475 } 4476 4477 if (dst) *dst = ntohl(ddst); 4478 if (src) *src = ntohl(ssrc); 4479} 4480 4481/* 4482 * Set my IP address. Must be called at splimp. 4483 */ 4484static void 4485sppp_set_ip_addr(struct sppp *sp, u_long src) 4486{ 4487 STDDCL; 4488 struct ifaddr *ifa; 4489 struct sockaddr_in *si; 4490 4491 /* 4492 * Pick the first AF_INET address from the list, 4493 * aliases don't make any sense on a p2p link anyway. 4494 */ 4495 si = 0; 4496#if defined(__FreeBSD__) && __FreeBSD__ >= 3 4497 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 4498#elif defined(__NetBSD__) || defined (__OpenBSD__) 4499 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); 4500 ifa; 4501 ifa = TAILQ_NEXT(ifa, ifa_list)) 4502#else 4503 for (ifa = ifp->if_addrlist; 4504 ifa; 4505 ifa = ifa->ifa_next) 4506#endif 4507 { 4508 if (ifa->ifa_addr->sa_family == AF_INET) 4509 { 4510 si = (struct sockaddr_in *)ifa->ifa_addr; 4511 if (si) 4512 break; 4513 } 4514 } 4515 4516 if (ifa && si) 4517 { 4518 int error; 4519#if __NetBSD_Version__ >= 103080000 4520 struct sockaddr_in new_sin = *si; 4521 4522 new_sin.sin_addr.s_addr = htonl(src); 4523 error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 1); 4524 if(debug && error) 4525 { 4526 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: in_ifinit " 4527 " failed, error=%d\n", SPP_ARGS(ifp), error); 4528 } 4529#else 4530 /* delete old route */ 4531 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST); 4532 if(debug && error) 4533 { 4534 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n", 4535 SPP_ARGS(ifp), error); 4536 } 4537 4538 /* set new address */ 4539 si->sin_addr.s_addr = htonl(src); 4540 4541 /* add new route */ 4542 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST); 4543 if (debug && error) 4544 { 4545 log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d", 4546 SPP_ARGS(ifp), error); 4547 } 4548#endif 4549 } 4550} 4551 4552#ifdef INET6 4553/* 4554 * Get both IPv6 addresses. 4555 */ 4556static void 4557sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst, 4558 struct in6_addr *srcmask) 4559{ 4560 struct ifnet *ifp = &sp->pp_if; 4561 struct ifaddr *ifa; 4562 struct sockaddr_in6 *si, *sm; 4563 struct in6_addr ssrc, ddst; 4564 4565 sm = NULL; 4566 bzero(&ssrc, sizeof(ssrc)); 4567 bzero(&ddst, sizeof(ddst)); 4568 /* 4569 * Pick the first link-local AF_INET6 address from the list, 4570 * aliases don't make any sense on a p2p link anyway. 4571 */ 4572#if defined(__FreeBSD__) && __FreeBSD__ >= 3 4573 for (ifa = ifp->if_addrhead.tqh_first, si = 0; 4574 ifa; 4575 ifa = ifa->ifa_link.tqe_next) 4576#elif defined(__NetBSD__) || defined (__OpenBSD__) 4577 for (ifa = ifp->if_addrlist.tqh_first, si = 0; 4578 ifa; 4579 ifa = ifa->ifa_list.tqe_next) 4580#else 4581 for (ifa = ifp->if_addrlist, si = 0; 4582 ifa; 4583 ifa = ifa->ifa_next) 4584#endif 4585 if (ifa->ifa_addr->sa_family == AF_INET6) { 4586 si = (struct sockaddr_in6 *)ifa->ifa_addr; 4587 sm = (struct sockaddr_in6 *)ifa->ifa_netmask; 4588 if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr)) 4589 break; 4590 } 4591 if (ifa) { 4592 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) { 4593 bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc)); 4594 if (srcmask) { 4595 bcopy(&sm->sin6_addr, srcmask, 4596 sizeof(*srcmask)); 4597 } 4598 } 4599 4600 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr; 4601 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) 4602 bcopy(&si->sin6_addr, &ddst, sizeof(ddst)); 4603 } 4604 4605 if (dst) 4606 bcopy(&ddst, dst, sizeof(*dst)); 4607 if (src) 4608 bcopy(&ssrc, src, sizeof(*src)); 4609} 4610 4611#ifdef IPV6CP_MYIFID_DYN 4612/* 4613 * Generate random ifid. 4614 */ 4615static void 4616sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr) 4617{ 4618 /* TBD */ 4619} 4620 4621/* 4622 * Set my IPv6 address. Must be called at splimp. 4623 */ 4624static void 4625sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src) 4626{ 4627 STDDCL; 4628 struct ifaddr *ifa; 4629 struct sockaddr_in6 *sin6; 4630 4631 /* 4632 * Pick the first link-local AF_INET6 address from the list, 4633 * aliases don't make any sense on a p2p link anyway. 4634 */ 4635 4636 sin6 = NULL; 4637#if defined(__FreeBSD__) && __FreeBSD__ >= 3 4638 for (ifa = ifp->if_addrhead.tqh_first; 4639 ifa; 4640 ifa = ifa->ifa_link.tqe_next) 4641#elif defined(__NetBSD__) || defined (__OpenBSD__) 4642 for (ifa = ifp->if_addrlist.tqh_first; 4643 ifa; 4644 ifa = ifa->ifa_list.tqe_next) 4645#else 4646 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 4647#endif 4648 { 4649 if (ifa->ifa_addr->sa_family == AF_INET6) 4650 { 4651 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 4652 if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 4653 break; 4654 } 4655 } 4656 4657 if (ifa && sin6) 4658 { 4659 int error; 4660 struct sockaddr_in6 new_sin6 = *sin6; 4661 4662 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr)); 4663 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1); 4664 if (debug && error) 4665 { 4666 log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit " 4667 " failed, error=%d\n", SPP_ARGS(ifp), error); 4668 } 4669 } 4670} 4671#endif 4672 4673/* 4674 * Suggest a candidate address to be used by peer. 4675 */ 4676static void 4677sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest) 4678{ 4679 struct in6_addr myaddr; 4680 struct timeval tv; 4681 4682 sppp_get_ip6_addrs(sp, &myaddr, 0, 0); 4683 4684 myaddr.s6_addr[8] &= ~0x02; /* u bit to "local" */ 4685 microtime(&tv); 4686 if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) { 4687 myaddr.s6_addr[14] ^= 0xff; 4688 myaddr.s6_addr[15] ^= 0xff; 4689 } else { 4690 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff); 4691 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff); 4692 } 4693 if (suggest) 4694 bcopy(&myaddr, suggest, sizeof(myaddr)); 4695} 4696#endif /*INET6*/ 4697 4698static int 4699sppp_params(struct sppp *sp, u_long cmd, void *data) 4700{ 4701 u_long subcmd; 4702 struct ifreq *ifr = (struct ifreq *)data; 4703 struct spppreq spr; 4704 4705 /* 4706 * ifr->ifr_data is supposed to point to a struct spppreq. 4707 * Check the cmd word first before attempting to fetch all the 4708 * data. 4709 */ 4710 if ((subcmd = fuword(ifr->ifr_data)) == -1) 4711 return EFAULT; 4712 4713 if (copyin((caddr_t)ifr->ifr_data, &spr, sizeof spr) != 0) 4714 return EFAULT; 4715 4716 switch (subcmd) { 4717 case SPPPIOGDEFS: 4718 if (cmd != SIOCGIFGENERIC) 4719 return EINVAL; 4720 /* 4721 * We copy over the entire current state, but clean 4722 * out some of the stuff we don't wanna pass up. 4723 * Remember, SIOCGIFGENERIC is unprotected, and can be 4724 * called by any user. No need to ever get PAP or 4725 * CHAP secrets back to userland anyway. 4726 */ 4727 bcopy(sp, &spr.defs, sizeof(struct sppp)); 4728 bzero(spr.defs.myauth.secret, AUTHKEYLEN); 4729 bzero(spr.defs.myauth.challenge, AUTHKEYLEN); 4730 bzero(spr.defs.hisauth.secret, AUTHKEYLEN); 4731 bzero(spr.defs.hisauth.challenge, AUTHKEYLEN); 4732 return copyout(&spr, (caddr_t)ifr->ifr_data, sizeof spr); 4733 4734 case SPPPIOSDEFS: 4735 if (cmd != SIOCSIFGENERIC) 4736 return EINVAL; 4737 /* 4738 * We have a very specific idea of which fields we allow 4739 * being passed back from userland, so to not clobber our 4740 * current state. For one, we only allow setting 4741 * anything if LCP is in dead phase. Once the LCP 4742 * negotiations started, the authentication settings must 4743 * not be changed again. (The administrator can force an 4744 * ifconfig down in order to get LCP back into dead 4745 * phase.) 4746 * 4747 * Also, we only allow for authentication parameters to be 4748 * specified. 4749 * 4750 * XXX Should allow to set or clear pp_flags. 4751 * 4752 * Finally, if the respective authentication protocol to 4753 * be used is set differently than 0, but the secret is 4754 * passed as all zeros, we don't trash the existing secret. 4755 * This allows an administrator to change the system name 4756 * only without clobbering the secret (which he didn't get 4757 * back in a previous SPPPIOGDEFS call). However, the 4758 * secrets are cleared if the authentication protocol is 4759 * reset to 0. 4760 */ 4761 if (sp->pp_phase != PHASE_DEAD) 4762 return EBUSY; 4763 4764 if ((spr.defs.myauth.proto != 0 && spr.defs.myauth.proto != PPP_PAP && 4765 spr.defs.myauth.proto != PPP_CHAP) || 4766 (spr.defs.hisauth.proto != 0 && spr.defs.hisauth.proto != PPP_PAP && 4767 spr.defs.hisauth.proto != PPP_CHAP)) 4768 return EINVAL; 4769 4770 if (spr.defs.myauth.proto == 0) 4771 /* resetting myauth */ 4772 bzero(&sp->myauth, sizeof sp->myauth); 4773 else { 4774 /* setting/changing myauth */ 4775 sp->myauth.proto = spr.defs.myauth.proto; 4776 bcopy(spr.defs.myauth.name, sp->myauth.name, AUTHNAMELEN); 4777 if (spr.defs.myauth.secret[0] != '\0') 4778 bcopy(spr.defs.myauth.secret, sp->myauth.secret, 4779 AUTHKEYLEN); 4780 } 4781 if (spr.defs.hisauth.proto == 0) 4782 /* resetting hisauth */ 4783 bzero(&sp->hisauth, sizeof sp->hisauth); 4784 else { 4785 /* setting/changing hisauth */ 4786 sp->hisauth.proto = spr.defs.hisauth.proto; 4787 sp->hisauth.flags = spr.defs.hisauth.flags; 4788 bcopy(spr.defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN); 4789 if (spr.defs.hisauth.secret[0] != '\0') 4790 bcopy(spr.defs.hisauth.secret, sp->hisauth.secret, 4791 AUTHKEYLEN); 4792 } 4793 break; 4794 4795 default: 4796 return EINVAL; 4797 } 4798 4799 return 0; 4800} 4801 4802static void 4803sppp_phase_network(struct sppp *sp) 4804{ 4805 STDDCL; 4806 int i; 4807 u_long mask; 4808 4809 sp->pp_phase = PHASE_NETWORK; 4810 4811 if (debug) 4812 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp), 4813 sppp_phase_name(sp->pp_phase)); 4814 4815 /* Notify NCPs now. */ 4816 for (i = 0; i < IDX_COUNT; i++) 4817 if ((cps[i])->flags & CP_NCP) 4818 (cps[i])->Open(sp); 4819 4820 /* Send Up events to all NCPs. */ 4821 for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1) 4822 if (sp->lcp.protos & mask && ((cps[i])->flags & CP_NCP)) 4823 (cps[i])->Up(sp); 4824 4825 /* if no NCP is starting, all this was in vain, close down */ 4826 sppp_lcp_check_and_close(sp); 4827} 4828 4829 4830static const char * 4831sppp_cp_type_name(u_char type) 4832{ 4833 static char buf[12]; 4834 switch (type) { 4835 case CONF_REQ: return "conf-req"; 4836 case CONF_ACK: return "conf-ack"; 4837 case CONF_NAK: return "conf-nak"; 4838 case CONF_REJ: return "conf-rej"; 4839 case TERM_REQ: return "term-req"; 4840 case TERM_ACK: return "term-ack"; 4841 case CODE_REJ: return "code-rej"; 4842 case PROTO_REJ: return "proto-rej"; 4843 case ECHO_REQ: return "echo-req"; 4844 case ECHO_REPLY: return "echo-reply"; 4845 case DISC_REQ: return "discard-req"; 4846 } 4847 snprintf (buf, sizeof(buf), "cp/0x%x", type); 4848 return buf; 4849} 4850 4851static const char * 4852sppp_auth_type_name(u_short proto, u_char type) 4853{ 4854 static char buf[12]; 4855 switch (proto) { 4856 case PPP_CHAP: 4857 switch (type) { 4858 case CHAP_CHALLENGE: return "challenge"; 4859 case CHAP_RESPONSE: return "response"; 4860 case CHAP_SUCCESS: return "success"; 4861 case CHAP_FAILURE: return "failure"; 4862 } 4863 case PPP_PAP: 4864 switch (type) { 4865 case PAP_REQ: return "req"; 4866 case PAP_ACK: return "ack"; 4867 case PAP_NAK: return "nak"; 4868 } 4869 } 4870 snprintf (buf, sizeof(buf), "auth/0x%x", type); 4871 return buf; 4872} 4873 4874static const char * 4875sppp_lcp_opt_name(u_char opt) 4876{ 4877 static char buf[12]; 4878 switch (opt) { 4879 case LCP_OPT_MRU: return "mru"; 4880 case LCP_OPT_ASYNC_MAP: return "async-map"; 4881 case LCP_OPT_AUTH_PROTO: return "auth-proto"; 4882 case LCP_OPT_QUAL_PROTO: return "qual-proto"; 4883 case LCP_OPT_MAGIC: return "magic"; 4884 case LCP_OPT_PROTO_COMP: return "proto-comp"; 4885 case LCP_OPT_ADDR_COMP: return "addr-comp"; 4886 } 4887 snprintf (buf, sizeof(buf), "lcp/0x%x", opt); 4888 return buf; 4889} 4890 4891static const char * 4892sppp_ipcp_opt_name(u_char opt) 4893{ 4894 static char buf[12]; 4895 switch (opt) { 4896 case IPCP_OPT_ADDRESSES: return "addresses"; 4897 case IPCP_OPT_COMPRESSION: return "compression"; 4898 case IPCP_OPT_ADDRESS: return "address"; 4899 } 4900 snprintf (buf, sizeof(buf), "ipcp/0x%x", opt); 4901 return buf; 4902} 4903 4904#ifdef INET6 4905static const char * 4906sppp_ipv6cp_opt_name(u_char opt) 4907{ 4908 static char buf[12]; 4909 switch (opt) { 4910 case IPV6CP_OPT_IFID: return "ifid"; 4911 case IPV6CP_OPT_COMPRESSION: return "compression"; 4912 } 4913 sprintf (buf, "0x%x", opt); 4914 return buf; 4915} 4916#endif 4917 4918static const char * 4919sppp_state_name(int state) 4920{ 4921 switch (state) { 4922 case STATE_INITIAL: return "initial"; 4923 case STATE_STARTING: return "starting"; 4924 case STATE_CLOSED: return "closed"; 4925 case STATE_STOPPED: return "stopped"; 4926 case STATE_CLOSING: return "closing"; 4927 case STATE_STOPPING: return "stopping"; 4928 case STATE_REQ_SENT: return "req-sent"; 4929 case STATE_ACK_RCVD: return "ack-rcvd"; 4930 case STATE_ACK_SENT: return "ack-sent"; 4931 case STATE_OPENED: return "opened"; 4932 } 4933 return "illegal"; 4934} 4935 4936static const char * 4937sppp_phase_name(enum ppp_phase phase) 4938{ 4939 switch (phase) { 4940 case PHASE_DEAD: return "dead"; 4941 case PHASE_ESTABLISH: return "establish"; 4942 case PHASE_TERMINATE: return "terminate"; 4943 case PHASE_AUTHENTICATE: return "authenticate"; 4944 case PHASE_NETWORK: return "network"; 4945 } 4946 return "illegal"; 4947} 4948 4949static const char * 4950sppp_proto_name(u_short proto) 4951{ 4952 static char buf[12]; 4953 switch (proto) { 4954 case PPP_LCP: return "lcp"; 4955 case PPP_IPCP: return "ipcp"; 4956 case PPP_PAP: return "pap"; 4957 case PPP_CHAP: return "chap"; 4958 case PPP_IPV6CP: return "ipv6cp"; 4959 } 4960 snprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto); 4961 return buf; 4962} 4963 4964static void 4965sppp_print_bytes(const u_char *p, u_short len) 4966{ 4967 if (len) 4968 log(-1, " %*D", len, p, "-"); 4969} 4970 4971static void 4972sppp_print_string(const char *p, u_short len) 4973{ 4974 u_char c; 4975 4976 while (len-- > 0) { 4977 c = *p++; 4978 /* 4979 * Print only ASCII chars directly. RFC 1994 recommends 4980 * using only them, but we don't rely on it. */ 4981 if (c < ' ' || c > '~') 4982 log(-1, "\\x%x", c); 4983 else 4984 log(-1, "%c", c); 4985 } 4986} 4987 4988static const char * 4989sppp_dotted_quad(u_long addr) 4990{ 4991 static char s[16]; 4992 sprintf(s, "%d.%d.%d.%d", 4993 (int)((addr >> 24) & 0xff), 4994 (int)((addr >> 16) & 0xff), 4995 (int)((addr >> 8) & 0xff), 4996 (int)(addr & 0xff)); 4997 return s; 4998} 4999 5000static int 5001sppp_strnlen(u_char *p, int max) 5002{ 5003 int len; 5004 5005 for (len = 0; len < max && *p; ++p) 5006 ++len; 5007 return len; 5008} 5009 5010/* a dummy, used to drop uninteresting events */ 5011static void 5012sppp_null(struct sppp *unused) 5013{ 5014 /* do just nothing */ 5015} 5016