raw_ip.c revision 1.70.2.2
1 /* $NetBSD: raw_ip.c,v 1.70.2.2 2004/08/03 10:54:43 skrll Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1986, 1988, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95 61 */ 62 63 #include <sys/cdefs.h> 64 __KERNEL_RCSID(0, "$NetBSD: raw_ip.c,v 1.70.2.2 2004/08/03 10:54:43 skrll Exp $"); 65 66 #include "opt_inet.h" 67 #include "opt_ipsec.h" 68 #include "opt_mrouting.h" 69 70 #include <sys/param.h> 71 #include <sys/malloc.h> 72 #include <sys/mbuf.h> 73 #include <sys/socket.h> 74 #include <sys/protosw.h> 75 #include <sys/socketvar.h> 76 #include <sys/errno.h> 77 #include <sys/systm.h> 78 #include <sys/proc.h> 79 80 #include <net/if.h> 81 #include <net/route.h> 82 83 #include <netinet/in.h> 84 #include <netinet/in_systm.h> 85 #include <netinet/ip.h> 86 #include <netinet/ip_var.h> 87 #include <netinet/ip_mroute.h> 88 #include <netinet/ip_icmp.h> 89 #include <netinet/in_pcb.h> 90 #include <netinet/in_var.h> 91 92 #include <machine/stdarg.h> 93 94 #ifdef IPSEC 95 #include <netinet6/ipsec.h> 96 #endif /*IPSEC*/ 97 98 #ifdef FAST_IPSEC 99 #include <netipsec/ipsec.h> 100 #include <netipsec/ipsec_var.h> /* XXX ipsecstat namespace */ 101 #endif /* FAST_IPSEC*/ 102 103 struct inpcbtable rawcbtable; 104 105 int rip_pcbnotify __P((struct inpcbtable *, struct in_addr, 106 struct in_addr, int, int, void (*) __P((struct inpcb *, int)))); 107 int rip_bind __P((struct inpcb *, struct mbuf *)); 108 int rip_connect __P((struct inpcb *, struct mbuf *)); 109 void rip_disconnect __P((struct inpcb *)); 110 111 /* 112 * Nominal space allocated to a raw ip socket. 113 */ 114 #define RIPSNDQ 8192 115 #define RIPRCVQ 8192 116 117 /* 118 * Raw interface to IP protocol. 119 */ 120 121 /* 122 * Initialize raw connection block q. 123 */ 124 void 125 rip_init() 126 { 127 128 in_pcbinit(&rawcbtable, 1, 1); 129 } 130 131 /* 132 * Setup generic address and protocol structures 133 * for raw_input routine, then pass them along with 134 * mbuf chain. 135 */ 136 void 137 rip_input(struct mbuf *m, ...) 138 { 139 int proto; 140 struct ip *ip = mtod(m, struct ip *); 141 struct inpcb_hdr *inph; 142 struct inpcb *inp; 143 struct inpcb *last = 0; 144 struct mbuf *opts = 0; 145 struct sockaddr_in ripsrc; 146 va_list ap; 147 148 va_start(ap, m); 149 (void)va_arg(ap, int); /* ignore value, advance ap */ 150 proto = va_arg(ap, int); 151 va_end(ap); 152 153 ripsrc.sin_family = AF_INET; 154 ripsrc.sin_len = sizeof(struct sockaddr_in); 155 ripsrc.sin_addr = ip->ip_src; 156 ripsrc.sin_port = 0; 157 bzero((caddr_t)ripsrc.sin_zero, sizeof(ripsrc.sin_zero)); 158 159 /* 160 * XXX Compatibility: programs using raw IP expect ip_len 161 * XXX to have the header length subtracted, and in host order. 162 * XXX ip_off is also expected to be host order. 163 */ 164 ip->ip_len = ntohs(ip->ip_len) - (ip->ip_hl << 2); 165 NTOHS(ip->ip_off); 166 167 CIRCLEQ_FOREACH(inph, &rawcbtable.inpt_queue, inph_queue) { 168 inp = (struct inpcb *)inph; 169 if (inp->inp_af != AF_INET) 170 continue; 171 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != proto) 172 continue; 173 if (!in_nullhost(inp->inp_laddr) && 174 !in_hosteq(inp->inp_laddr, ip->ip_dst)) 175 continue; 176 if (!in_nullhost(inp->inp_faddr) && 177 !in_hosteq(inp->inp_faddr, ip->ip_src)) 178 continue; 179 if (last) { 180 struct mbuf *n; 181 182 #if defined(IPSEC) || defined(FAST_IPSEC) 183 /* check AH/ESP integrity. */ 184 if (ipsec4_in_reject_so(m, last->inp_socket)) { 185 ipsecstat.in_polvio++; 186 /* do not inject data to pcb */ 187 } else 188 #endif /*IPSEC*/ 189 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 190 if (last->inp_flags & INP_CONTROLOPTS || 191 last->inp_socket->so_options & SO_TIMESTAMP) 192 ip_savecontrol(last, &opts, ip, n); 193 if (sbappendaddr(&last->inp_socket->so_rcv, 194 sintosa(&ripsrc), n, opts) == 0) { 195 /* should notify about lost packet */ 196 m_freem(n); 197 if (opts) 198 m_freem(opts); 199 } else 200 sorwakeup(last->inp_socket); 201 opts = NULL; 202 } 203 } 204 last = inp; 205 } 206 #if defined(IPSEC) || defined(FAST_IPSEC) 207 /* check AH/ESP integrity. */ 208 if (last && ipsec4_in_reject_so(m, last->inp_socket)) { 209 m_freem(m); 210 ipsecstat.in_polvio++; 211 ipstat.ips_delivered--; 212 /* do not inject data to pcb */ 213 } else 214 #endif /*IPSEC*/ 215 if (last) { 216 if (last->inp_flags & INP_CONTROLOPTS || 217 last->inp_socket->so_options & SO_TIMESTAMP) 218 ip_savecontrol(last, &opts, ip, m); 219 if (sbappendaddr(&last->inp_socket->so_rcv, 220 sintosa(&ripsrc), m, opts) == 0) { 221 m_freem(m); 222 if (opts) 223 m_freem(opts); 224 } else 225 sorwakeup(last->inp_socket); 226 } else { 227 if (inetsw[ip_protox[ip->ip_p]].pr_input == rip_input) { 228 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PROTOCOL, 229 0, 0); 230 ipstat.ips_noproto++; 231 ipstat.ips_delivered--; 232 } else 233 m_freem(m); 234 } 235 return; 236 } 237 238 int 239 rip_pcbnotify(table, faddr, laddr, proto, errno, notify) 240 struct inpcbtable *table; 241 struct in_addr faddr, laddr; 242 int proto; 243 int errno; 244 void (*notify) __P((struct inpcb *, int)); 245 { 246 struct inpcb *inp, *ninp; 247 int nmatch; 248 249 nmatch = 0; 250 for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue); 251 inp != (struct inpcb *)&table->inpt_queue; 252 inp = ninp) { 253 ninp = (struct inpcb *)inp->inp_queue.cqe_next; 254 if (inp->inp_af != AF_INET) 255 continue; 256 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != proto) 257 continue; 258 if (in_hosteq(inp->inp_faddr, faddr) && 259 in_hosteq(inp->inp_laddr, laddr)) { 260 (*notify)(inp, errno); 261 nmatch++; 262 } 263 } 264 265 return nmatch; 266 } 267 268 void * 269 rip_ctlinput(cmd, sa, v) 270 int cmd; 271 struct sockaddr *sa; 272 void *v; 273 { 274 struct ip *ip = v; 275 void (*notify) __P((struct inpcb *, int)) = in_rtchange; 276 int errno; 277 278 if (sa->sa_family != AF_INET || 279 sa->sa_len != sizeof(struct sockaddr_in)) 280 return NULL; 281 if ((unsigned)cmd >= PRC_NCMDS) 282 return NULL; 283 errno = inetctlerrmap[cmd]; 284 if (PRC_IS_REDIRECT(cmd)) 285 notify = in_rtchange, ip = 0; 286 else if (cmd == PRC_HOSTDEAD) 287 ip = 0; 288 else if (errno == 0) 289 return NULL; 290 if (ip) { 291 rip_pcbnotify(&rawcbtable, satosin(sa)->sin_addr, 292 ip->ip_src, ip->ip_p, errno, notify); 293 294 /* XXX mapped address case */ 295 } else 296 in_pcbnotifyall(&rawcbtable, satosin(sa)->sin_addr, errno, 297 notify); 298 return NULL; 299 } 300 301 /* 302 * Generate IP header and pass packet to ip_output. 303 * Tack on options user may have setup with control call. 304 */ 305 int 306 rip_output(struct mbuf *m, ...) 307 { 308 struct inpcb *inp; 309 struct ip *ip; 310 struct mbuf *opts; 311 int flags; 312 va_list ap; 313 314 va_start(ap, m); 315 inp = va_arg(ap, struct inpcb *); 316 va_end(ap); 317 318 flags = 319 (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST 320 | IP_RETURNMTU; 321 322 /* 323 * If the user handed us a complete IP packet, use it. 324 * Otherwise, allocate an mbuf for a header and fill it in. 325 */ 326 if ((inp->inp_flags & INP_HDRINCL) == 0) { 327 if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) { 328 m_freem(m); 329 return (EMSGSIZE); 330 } 331 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 332 if (!m) 333 return (ENOBUFS); 334 ip = mtod(m, struct ip *); 335 ip->ip_tos = 0; 336 ip->ip_off = htons(0); 337 ip->ip_p = inp->inp_ip.ip_p; 338 ip->ip_len = htons(m->m_pkthdr.len); 339 ip->ip_src = inp->inp_laddr; 340 ip->ip_dst = inp->inp_faddr; 341 ip->ip_ttl = MAXTTL; 342 opts = inp->inp_options; 343 } else { 344 if (m->m_pkthdr.len > IP_MAXPACKET) { 345 m_freem(m); 346 return (EMSGSIZE); 347 } 348 ip = mtod(m, struct ip *); 349 350 /* 351 * If the mbuf is read-only, we need to allocate 352 * a new mbuf for the header, since we need to 353 * modify the header. 354 */ 355 if (M_READONLY(m)) { 356 int hlen = ip->ip_hl << 2; 357 358 m = m_copyup(m, hlen, (max_linkhdr + 3) & ~3); 359 if (m == NULL) 360 return (ENOMEM); /* XXX */ 361 ip = mtod(m, struct ip *); 362 } 363 364 /* XXX userland passes ip_len and ip_off in host order */ 365 if (m->m_pkthdr.len != ip->ip_len) { 366 m_freem(m); 367 return (EINVAL); 368 } 369 HTONS(ip->ip_len); 370 HTONS(ip->ip_off); 371 if (ip->ip_id == 0) 372 ip->ip_id = ip_newid(); 373 opts = NULL; 374 /* XXX prevent ip_output from overwriting header fields */ 375 flags |= IP_RAWOUTPUT; 376 ipstat.ips_rawout++; 377 } 378 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions, 379 inp->inp_socket, &inp->inp_errormtu)); 380 } 381 382 /* 383 * Raw IP socket option processing. 384 */ 385 int 386 rip_ctloutput(op, so, level, optname, m) 387 int op; 388 struct socket *so; 389 int level, optname; 390 struct mbuf **m; 391 { 392 struct inpcb *inp = sotoinpcb(so); 393 int error = 0; 394 395 if (level != IPPROTO_IP) { 396 error = ENOPROTOOPT; 397 if (op == PRCO_SETOPT && *m != 0) 398 (void) m_free(*m); 399 } else switch (op) { 400 401 case PRCO_SETOPT: 402 switch (optname) { 403 case IP_HDRINCL: 404 if (*m == 0 || (*m)->m_len < sizeof (int)) 405 error = EINVAL; 406 else { 407 if (*mtod(*m, int *)) 408 inp->inp_flags |= INP_HDRINCL; 409 else 410 inp->inp_flags &= ~INP_HDRINCL; 411 } 412 if (*m != 0) 413 (void) m_free(*m); 414 break; 415 416 #ifdef MROUTING 417 case MRT_INIT: 418 case MRT_DONE: 419 case MRT_ADD_VIF: 420 case MRT_DEL_VIF: 421 case MRT_ADD_MFC: 422 case MRT_DEL_MFC: 423 case MRT_ASSERT: 424 error = ip_mrouter_set(so, optname, m); 425 break; 426 #endif 427 428 default: 429 error = ip_ctloutput(op, so, level, optname, m); 430 break; 431 } 432 break; 433 434 case PRCO_GETOPT: 435 switch (optname) { 436 case IP_HDRINCL: 437 *m = m_get(M_WAIT, MT_SOOPTS); 438 MCLAIM((*m), so->so_mowner); 439 (*m)->m_len = sizeof (int); 440 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0; 441 break; 442 443 #ifdef MROUTING 444 case MRT_VERSION: 445 case MRT_ASSERT: 446 error = ip_mrouter_get(so, optname, m); 447 break; 448 #endif 449 450 default: 451 error = ip_ctloutput(op, so, level, optname, m); 452 break; 453 } 454 break; 455 } 456 return (error); 457 } 458 459 int 460 rip_bind(inp, nam) 461 struct inpcb *inp; 462 struct mbuf *nam; 463 { 464 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 465 466 if (nam->m_len != sizeof(*addr)) 467 return (EINVAL); 468 if (TAILQ_FIRST(&ifnet) == 0) 469 return (EADDRNOTAVAIL); 470 if (addr->sin_family != AF_INET && 471 addr->sin_family != AF_IMPLINK) 472 return (EAFNOSUPPORT); 473 if (!in_nullhost(addr->sin_addr) && 474 ifa_ifwithaddr(sintosa(addr)) == 0) 475 return (EADDRNOTAVAIL); 476 inp->inp_laddr = addr->sin_addr; 477 return (0); 478 } 479 480 int 481 rip_connect(inp, nam) 482 struct inpcb *inp; 483 struct mbuf *nam; 484 { 485 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 486 487 if (nam->m_len != sizeof(*addr)) 488 return (EINVAL); 489 if (TAILQ_FIRST(&ifnet) == 0) 490 return (EADDRNOTAVAIL); 491 if (addr->sin_family != AF_INET && 492 addr->sin_family != AF_IMPLINK) 493 return (EAFNOSUPPORT); 494 inp->inp_faddr = addr->sin_addr; 495 return (0); 496 } 497 498 void 499 rip_disconnect(inp) 500 struct inpcb *inp; 501 { 502 503 inp->inp_faddr = zeroin_addr; 504 } 505 506 u_long rip_sendspace = RIPSNDQ; 507 u_long rip_recvspace = RIPRCVQ; 508 509 /*ARGSUSED*/ 510 int 511 rip_usrreq(so, req, m, nam, control, l) 512 struct socket *so; 513 int req; 514 struct mbuf *m, *nam, *control; 515 struct lwp *l; 516 { 517 struct inpcb *inp; 518 struct proc *p; 519 int s; 520 int error = 0; 521 #ifdef MROUTING 522 extern struct socket *ip_mrouter; 523 #endif 524 525 p = l ? l->l_proc : NULL; 526 if (req == PRU_CONTROL) 527 return (in_control(so, (long)m, (caddr_t)nam, 528 (struct ifnet *)control, p)); 529 530 if (req == PRU_PURGEIF) { 531 in_pcbpurgeif0(&rawcbtable, (struct ifnet *)control); 532 in_purgeif((struct ifnet *)control); 533 in_pcbpurgeif(&rawcbtable, (struct ifnet *)control); 534 return (0); 535 } 536 537 s = splsoftnet(); 538 inp = sotoinpcb(so); 539 #ifdef DIAGNOSTIC 540 if (req != PRU_SEND && req != PRU_SENDOOB && control) 541 panic("rip_usrreq: unexpected control mbuf"); 542 #endif 543 if (inp == 0 && req != PRU_ATTACH) { 544 error = EINVAL; 545 goto release; 546 } 547 548 switch (req) { 549 550 case PRU_ATTACH: 551 if (inp != 0) { 552 error = EISCONN; 553 break; 554 } 555 if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) { 556 error = EACCES; 557 break; 558 } 559 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 560 error = soreserve(so, rip_sendspace, rip_recvspace); 561 if (error) 562 break; 563 } 564 error = in_pcballoc(so, &rawcbtable); 565 if (error) 566 break; 567 inp = sotoinpcb(so); 568 inp->inp_ip.ip_p = (long)nam; 569 break; 570 571 case PRU_DETACH: 572 #ifdef MROUTING 573 if (so == ip_mrouter) 574 ip_mrouter_done(); 575 #endif 576 in_pcbdetach(inp); 577 break; 578 579 case PRU_BIND: 580 error = rip_bind(inp, nam); 581 break; 582 583 case PRU_LISTEN: 584 error = EOPNOTSUPP; 585 break; 586 587 case PRU_CONNECT: 588 error = rip_connect(inp, nam); 589 if (error) 590 break; 591 soisconnected(so); 592 break; 593 594 case PRU_CONNECT2: 595 error = EOPNOTSUPP; 596 break; 597 598 case PRU_DISCONNECT: 599 soisdisconnected(so); 600 rip_disconnect(inp); 601 break; 602 603 /* 604 * Mark the connection as being incapable of further input. 605 */ 606 case PRU_SHUTDOWN: 607 socantsendmore(so); 608 break; 609 610 case PRU_RCVD: 611 error = EOPNOTSUPP; 612 break; 613 614 /* 615 * Ship a packet out. The appropriate raw output 616 * routine handles any massaging necessary. 617 */ 618 case PRU_SEND: 619 if (control && control->m_len) { 620 m_freem(control); 621 m_freem(m); 622 error = EINVAL; 623 break; 624 } 625 { 626 if (nam) { 627 if ((so->so_state & SS_ISCONNECTED) != 0) { 628 error = EISCONN; 629 goto die; 630 } 631 error = rip_connect(inp, nam); 632 if (error) { 633 die: 634 m_freem(m); 635 break; 636 } 637 } else { 638 if ((so->so_state & SS_ISCONNECTED) == 0) { 639 error = ENOTCONN; 640 goto die; 641 } 642 } 643 error = rip_output(m, inp); 644 if (nam) 645 rip_disconnect(inp); 646 } 647 break; 648 649 case PRU_SENSE: 650 /* 651 * stat: don't bother with a blocksize. 652 */ 653 splx(s); 654 return (0); 655 656 case PRU_RCVOOB: 657 error = EOPNOTSUPP; 658 break; 659 660 case PRU_SENDOOB: 661 m_freem(control); 662 m_freem(m); 663 error = EOPNOTSUPP; 664 break; 665 666 case PRU_SOCKADDR: 667 in_setsockaddr(inp, nam); 668 break; 669 670 case PRU_PEERADDR: 671 in_setpeeraddr(inp, nam); 672 break; 673 674 default: 675 panic("rip_usrreq"); 676 } 677 678 release: 679 splx(s); 680 return (error); 681 } 682
Indexes created Mon Sep 29 21:09:56 GMT 2025