raw_ip.c revision 1.65
1 /* $NetBSD: raw_ip.c,v 1.65 2002/11/07 17:49:08 thorpej 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. All advertising materials mentioning features or use of this software 45 * must display the following acknowledgement: 46 * This product includes software developed by the University of 47 * California, Berkeley and its contributors. 48 * 4. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95 65 */ 66 67 #include <sys/cdefs.h> 68 __KERNEL_RCSID(0, "$NetBSD: raw_ip.c,v 1.65 2002/11/07 17:49:08 thorpej Exp $"); 69 70 #include "opt_ipsec.h" 71 #include "opt_mrouting.h" 72 73 #include <sys/param.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/socket.h> 77 #include <sys/protosw.h> 78 #include <sys/socketvar.h> 79 #include <sys/errno.h> 80 #include <sys/systm.h> 81 #include <sys/proc.h> 82 83 #include <net/if.h> 84 #include <net/route.h> 85 86 #include <netinet/in.h> 87 #include <netinet/in_systm.h> 88 #include <netinet/ip.h> 89 #include <netinet/ip_var.h> 90 #include <netinet/ip_mroute.h> 91 #include <netinet/ip_icmp.h> 92 #include <netinet/in_pcb.h> 93 #include <netinet/in_var.h> 94 95 #include <machine/stdarg.h> 96 97 #ifdef IPSEC 98 #include <netinet6/ipsec.h> 99 #endif /*IPSEC*/ 100 101 struct inpcbtable rawcbtable; 102 103 int rip_pcbnotify __P((struct inpcbtable *, struct in_addr, 104 struct in_addr, int, int, void (*) __P((struct inpcb *, int)))); 105 int rip_bind __P((struct inpcb *, struct mbuf *)); 106 int rip_connect __P((struct inpcb *, struct mbuf *)); 107 void rip_disconnect __P((struct inpcb *)); 108 109 /* 110 * Nominal space allocated to a raw ip socket. 111 */ 112 #define RIPSNDQ 8192 113 #define RIPRCVQ 8192 114 115 /* 116 * Raw interface to IP protocol. 117 */ 118 119 /* 120 * Initialize raw connection block q. 121 */ 122 void 123 rip_init() 124 { 125 126 in_pcbinit(&rawcbtable, 1, 1); 127 } 128 129 /* 130 * Setup generic address and protocol structures 131 * for raw_input routine, then pass them along with 132 * mbuf chain. 133 */ 134 void 135 #if __STDC__ 136 rip_input(struct mbuf *m, ...) 137 #else 138 rip_input(m, va_alist) 139 struct mbuf *m; 140 va_dcl 141 #endif 142 { 143 int proto; 144 struct ip *ip = mtod(m, struct ip *); 145 struct inpcb *inp; 146 struct inpcb *last = 0; 147 struct mbuf *opts = 0; 148 struct sockaddr_in ripsrc; 149 va_list ap; 150 151 va_start(ap, m); 152 (void)va_arg(ap, int); /* ignore value, advance ap */ 153 proto = va_arg(ap, int); 154 va_end(ap); 155 156 ripsrc.sin_family = AF_INET; 157 ripsrc.sin_len = sizeof(struct sockaddr_in); 158 ripsrc.sin_addr = ip->ip_src; 159 ripsrc.sin_port = 0; 160 bzero((caddr_t)ripsrc.sin_zero, sizeof(ripsrc.sin_zero)); 161 162 /* 163 * XXX Compatibility: programs using raw IP expect ip_len 164 * XXX to have the header length subtracted, and in host order. 165 * XXX ip_off is also expected to be host order. 166 */ 167 ip->ip_len = ntohs(ip->ip_len) - (ip->ip_hl << 2); 168 NTOHS(ip->ip_off); 169 170 CIRCLEQ_FOREACH(inp, &rawcbtable.inpt_queue, inp_queue) { 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 #ifdef 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 #ifdef 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 = CIRCLEQ_FIRST(&table->inpt_queue); 251 inp != (struct inpcb *)&table->inpt_queue; 252 inp = ninp) { 253 ninp = inp->inp_queue.cqe_next; 254 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != proto) 255 continue; 256 if (in_hosteq(inp->inp_faddr, faddr) && 257 in_hosteq(inp->inp_laddr, laddr)) { 258 (*notify)(inp, errno); 259 nmatch++; 260 } 261 } 262 263 return nmatch; 264 } 265 266 void * 267 rip_ctlinput(cmd, sa, v) 268 int cmd; 269 struct sockaddr *sa; 270 void *v; 271 { 272 struct ip *ip = v; 273 void (*notify) __P((struct inpcb *, int)) = in_rtchange; 274 int errno; 275 276 if (sa->sa_family != AF_INET || 277 sa->sa_len != sizeof(struct sockaddr_in)) 278 return NULL; 279 if ((unsigned)cmd >= PRC_NCMDS) 280 return NULL; 281 errno = inetctlerrmap[cmd]; 282 if (PRC_IS_REDIRECT(cmd)) 283 notify = in_rtchange, ip = 0; 284 else if (cmd == PRC_HOSTDEAD) 285 ip = 0; 286 else if (errno == 0) 287 return NULL; 288 if (ip) { 289 rip_pcbnotify(&rawcbtable, satosin(sa)->sin_addr, 290 ip->ip_src, ip->ip_p, errno, notify); 291 292 /* XXX mapped address case */ 293 } else 294 in_pcbnotifyall(&rawcbtable, satosin(sa)->sin_addr, errno, 295 notify); 296 return NULL; 297 } 298 299 /* 300 * Generate IP header and pass packet to ip_output. 301 * Tack on options user may have setup with control call. 302 */ 303 int 304 #if __STDC__ 305 rip_output(struct mbuf *m, ...) 306 #else 307 rip_output(m, va_alist) 308 struct mbuf *m; 309 va_dcl 310 #endif 311 { 312 struct inpcb *inp; 313 struct ip *ip; 314 struct mbuf *opts; 315 int flags; 316 va_list ap; 317 318 va_start(ap, m); 319 inp = va_arg(ap, struct inpcb *); 320 va_end(ap); 321 322 flags = 323 (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST 324 | IP_RETURNMTU; 325 326 /* 327 * If the user handed us a complete IP packet, use it. 328 * Otherwise, allocate an mbuf for a header and fill it in. 329 */ 330 if ((inp->inp_flags & INP_HDRINCL) == 0) { 331 if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) { 332 m_freem(m); 333 return (EMSGSIZE); 334 } 335 M_PREPEND(m, sizeof(struct ip), M_WAIT); 336 ip = mtod(m, struct ip *); 337 ip->ip_tos = 0; 338 ip->ip_off = htons(0); 339 ip->ip_p = inp->inp_ip.ip_p; 340 ip->ip_len = htons(m->m_pkthdr.len); 341 ip->ip_src = inp->inp_laddr; 342 ip->ip_dst = inp->inp_faddr; 343 ip->ip_ttl = MAXTTL; 344 opts = inp->inp_options; 345 } else { 346 if (m->m_pkthdr.len > IP_MAXPACKET) { 347 m_freem(m); 348 return (EMSGSIZE); 349 } 350 ip = mtod(m, struct ip *); 351 352 /* 353 * If the mbuf is read-only, we need to allocate 354 * a new mbuf for the header, since we need to 355 * modify the header. 356 */ 357 if (M_READONLY(m)) { 358 int hlen = ip->ip_hl << 2; 359 360 m = m_copyup(m, hlen, (max_linkhdr + 3) & ~3); 361 if (m == NULL) 362 return (ENOMEM); /* XXX */ 363 ip = mtod(m, struct ip *); 364 } 365 366 /* XXX userland passes ip_len and ip_off in host order */ 367 if (m->m_pkthdr.len != ip->ip_len) { 368 m_freem(m); 369 return (EINVAL); 370 } 371 HTONS(ip->ip_len); 372 HTONS(ip->ip_off); 373 if (ip->ip_id == 0) 374 ip->ip_id = htons(ip_id++); 375 opts = NULL; 376 /* XXX prevent ip_output from overwriting header fields */ 377 flags |= IP_RAWOUTPUT; 378 ipstat.ips_rawout++; 379 } 380 #ifdef IPSEC 381 if (ipsec_setsocket(m, inp->inp_socket) != 0) { 382 m_freem(m); 383 return ENOBUFS; 384 } 385 #endif /*IPSEC*/ 386 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions, 387 &inp->inp_errormtu)); 388 } 389 390 /* 391 * Raw IP socket option processing. 392 */ 393 int 394 rip_ctloutput(op, so, level, optname, m) 395 int op; 396 struct socket *so; 397 int level, optname; 398 struct mbuf **m; 399 { 400 struct inpcb *inp = sotoinpcb(so); 401 int error = 0; 402 403 if (level != IPPROTO_IP) { 404 error = ENOPROTOOPT; 405 if (op == PRCO_SETOPT && *m != 0) 406 (void) m_free(*m); 407 } else switch (op) { 408 409 case PRCO_SETOPT: 410 switch (optname) { 411 case IP_HDRINCL: 412 if (*m == 0 || (*m)->m_len < sizeof (int)) 413 error = EINVAL; 414 else { 415 if (*mtod(*m, int *)) 416 inp->inp_flags |= INP_HDRINCL; 417 else 418 inp->inp_flags &= ~INP_HDRINCL; 419 } 420 if (*m != 0) 421 (void) m_free(*m); 422 break; 423 424 #ifdef MROUTING 425 case MRT_INIT: 426 case MRT_DONE: 427 case MRT_ADD_VIF: 428 case MRT_DEL_VIF: 429 case MRT_ADD_MFC: 430 case MRT_DEL_MFC: 431 case MRT_ASSERT: 432 error = ip_mrouter_set(so, optname, m); 433 break; 434 #endif 435 436 default: 437 error = ip_ctloutput(op, so, level, optname, m); 438 break; 439 } 440 break; 441 442 case PRCO_GETOPT: 443 switch (optname) { 444 case IP_HDRINCL: 445 *m = m_get(M_WAIT, M_SOOPTS); 446 (*m)->m_len = sizeof (int); 447 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0; 448 break; 449 450 #ifdef MROUTING 451 case MRT_VERSION: 452 case MRT_ASSERT: 453 error = ip_mrouter_get(so, optname, m); 454 break; 455 #endif 456 457 default: 458 error = ip_ctloutput(op, so, level, optname, m); 459 break; 460 } 461 break; 462 } 463 return (error); 464 } 465 466 int 467 rip_bind(inp, nam) 468 struct inpcb *inp; 469 struct mbuf *nam; 470 { 471 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 472 473 if (nam->m_len != sizeof(*addr)) 474 return (EINVAL); 475 if (TAILQ_FIRST(&ifnet) == 0) 476 return (EADDRNOTAVAIL); 477 if (addr->sin_family != AF_INET && 478 addr->sin_family != AF_IMPLINK) 479 return (EAFNOSUPPORT); 480 if (!in_nullhost(addr->sin_addr) && 481 ifa_ifwithaddr(sintosa(addr)) == 0) 482 return (EADDRNOTAVAIL); 483 inp->inp_laddr = addr->sin_addr; 484 return (0); 485 } 486 487 int 488 rip_connect(inp, nam) 489 struct inpcb *inp; 490 struct mbuf *nam; 491 { 492 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 493 494 if (nam->m_len != sizeof(*addr)) 495 return (EINVAL); 496 if (TAILQ_FIRST(&ifnet) == 0) 497 return (EADDRNOTAVAIL); 498 if (addr->sin_family != AF_INET && 499 addr->sin_family != AF_IMPLINK) 500 return (EAFNOSUPPORT); 501 inp->inp_faddr = addr->sin_addr; 502 return (0); 503 } 504 505 void 506 rip_disconnect(inp) 507 struct inpcb *inp; 508 { 509 510 inp->inp_faddr = zeroin_addr; 511 } 512 513 u_long rip_sendspace = RIPSNDQ; 514 u_long rip_recvspace = RIPRCVQ; 515 516 /*ARGSUSED*/ 517 int 518 rip_usrreq(so, req, m, nam, control, p) 519 struct socket *so; 520 int req; 521 struct mbuf *m, *nam, *control; 522 struct proc *p; 523 { 524 struct inpcb *inp; 525 int s; 526 int error = 0; 527 #ifdef MROUTING 528 extern struct socket *ip_mrouter; 529 #endif 530 531 if (req == PRU_CONTROL) 532 return (in_control(so, (long)m, (caddr_t)nam, 533 (struct ifnet *)control, p)); 534 535 if (req == PRU_PURGEIF) { 536 in_pcbpurgeif0(&rawcbtable, (struct ifnet *)control); 537 in_purgeif((struct ifnet *)control); 538 in_pcbpurgeif(&rawcbtable, (struct ifnet *)control); 539 return (0); 540 } 541 542 s = splsoftnet(); 543 inp = sotoinpcb(so); 544 #ifdef DIAGNOSTIC 545 if (req != PRU_SEND && req != PRU_SENDOOB && control) 546 panic("rip_usrreq: unexpected control mbuf"); 547 #endif 548 if (inp == 0 && req != PRU_ATTACH) { 549 error = EINVAL; 550 goto release; 551 } 552 553 switch (req) { 554 555 case PRU_ATTACH: 556 if (inp != 0) { 557 error = EISCONN; 558 break; 559 } 560 if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) { 561 error = EACCES; 562 break; 563 } 564 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 565 error = soreserve(so, rip_sendspace, rip_recvspace); 566 if (error) 567 break; 568 } 569 error = in_pcballoc(so, &rawcbtable); 570 if (error) 571 break; 572 inp = sotoinpcb(so); 573 inp->inp_ip.ip_p = (long)nam; 574 break; 575 576 case PRU_DETACH: 577 #ifdef MROUTING 578 if (so == ip_mrouter) 579 ip_mrouter_done(); 580 #endif 581 in_pcbdetach(inp); 582 break; 583 584 case PRU_BIND: 585 error = rip_bind(inp, nam); 586 break; 587 588 case PRU_LISTEN: 589 error = EOPNOTSUPP; 590 break; 591 592 case PRU_CONNECT: 593 error = rip_connect(inp, nam); 594 if (error) 595 break; 596 soisconnected(so); 597 break; 598 599 case PRU_CONNECT2: 600 error = EOPNOTSUPP; 601 break; 602 603 case PRU_DISCONNECT: 604 soisdisconnected(so); 605 rip_disconnect(inp); 606 break; 607 608 /* 609 * Mark the connection as being incapable of further input. 610 */ 611 case PRU_SHUTDOWN: 612 socantsendmore(so); 613 break; 614 615 case PRU_RCVD: 616 error = EOPNOTSUPP; 617 break; 618 619 /* 620 * Ship a packet out. The appropriate raw output 621 * routine handles any massaging necessary. 622 */ 623 case PRU_SEND: 624 if (control && control->m_len) { 625 m_freem(control); 626 m_freem(m); 627 error = EINVAL; 628 break; 629 } 630 { 631 if (nam) { 632 if ((so->so_state & SS_ISCONNECTED) != 0) { 633 error = EISCONN; 634 goto die; 635 } 636 error = rip_connect(inp, nam); 637 if (error) { 638 die: 639 m_freem(m); 640 break; 641 } 642 } else { 643 if ((so->so_state & SS_ISCONNECTED) == 0) { 644 error = ENOTCONN; 645 goto die; 646 } 647 } 648 error = rip_output(m, inp); 649 if (nam) 650 rip_disconnect(inp); 651 } 652 break; 653 654 case PRU_SENSE: 655 /* 656 * stat: don't bother with a blocksize. 657 */ 658 splx(s); 659 return (0); 660 661 case PRU_RCVOOB: 662 error = EOPNOTSUPP; 663 break; 664 665 case PRU_SENDOOB: 666 m_freem(control); 667 m_freem(m); 668 error = EOPNOTSUPP; 669 break; 670 671 case PRU_SOCKADDR: 672 in_setsockaddr(inp, nam); 673 break; 674 675 case PRU_PEERADDR: 676 in_setpeeraddr(inp, nam); 677 break; 678 679 default: 680 panic("rip_usrreq"); 681 } 682 683 release: 684 splx(s); 685 return (error); 686 } 687
Indexes created Mon Sep 29 21:09:56 GMT 2025