1 /* 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95 34 * $FreeBSD$ 35 */ 36 37 #include "opt_inet6.h" 38 #include "opt_ipsec.h" 39 #include "opt_random_ip_id.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/malloc.h> 45 #include <sys/mbuf.h> 46 #include <sys/protosw.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/sysctl.h> 50 51 #include <vm/vm_zone.h> 52 53 #include <net/if.h> 54 #include <net/route.h> 55 56 #define _IP_VHL 57 #include <netinet/in.h> 58 #include <netinet/in_systm.h> 59 #include <netinet/ip.h> 60 #include <netinet/in_pcb.h> 61 #include <netinet/in_var.h> 62 #include <netinet/ip_var.h> 63 #include <netinet/ip_mroute.h> 64 65 #include <netinet/ip_fw.h> 66 67 #ifdef IPSEC 68 #include <netinet6/ipsec.h> 69 #endif /*IPSEC*/ 70 71 #include "opt_ipdn.h" 72 #ifdef DUMMYNET 73 #include <netinet/ip_dummynet.h> 74 #endif 75 76 struct inpcbhead ripcb; 77 struct inpcbinfo ripcbinfo; 78 79 /* 80 * Nominal space allocated to a raw ip socket. 81 */ 82 #define RIPSNDQ 8192 83 #define RIPRCVQ 8192 84 85 /* 86 * Raw interface to IP protocol. 87 */ 88 89 /* 90 * Initialize raw connection block q. 91 */ 92 void 93 rip_init() 94 { 95 LIST_INIT(&ripcb); 96 ripcbinfo.listhead = &ripcb; 97 /* 98 * XXX We don't use the hash list for raw IP, but it's easier 99 * to allocate a one entry hash list than it is to check all 100 * over the place for hashbase == NULL. 101 */ 102 ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask); 103 ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask); 104 ripcbinfo.ipi_zone = zinit("ripcb", sizeof(struct inpcb), 105 maxsockets, ZONE_INTERRUPT, 0); 106 } 107 108 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 109 /* 110 * Setup generic address and protocol structures 111 * for raw_input routine, then pass them along with 112 * mbuf chain. 113 */ 114 void 115 rip_input(m, off) 116 struct mbuf *m; 117 int off; 118 { 119 register struct ip *ip = mtod(m, struct ip *); 120 register struct inpcb *inp; 121 struct inpcb *last = 0; 122 struct mbuf *opts = 0; 123 int proto = ip->ip_p; 124 125 ripsrc.sin_addr = ip->ip_src; 126 LIST_FOREACH(inp, &ripcb, inp_list) { 127 #ifdef INET6 128 if ((inp->inp_vflag & INP_IPV4) == 0) 129 continue; 130 #endif 131 if (inp->inp_ip_p && inp->inp_ip_p != proto) 132 continue; 133 if (inp->inp_laddr.s_addr && 134 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 135 continue; 136 if (inp->inp_faddr.s_addr && 137 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 138 continue; 139 if (last) { 140 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 141 142 #ifdef IPSEC 143 /* check AH/ESP integrity. */ 144 if (n && ipsec4_in_reject_so(n, last->inp_socket)) { 145 m_freem(n); 146 ipsecstat.in_polvio++; 147 /* do not inject data to pcb */ 148 } else 149 #endif /*IPSEC*/ 150 if (n) { 151 if (last->inp_flags & INP_CONTROLOPTS || 152 last->inp_socket->so_options & SO_TIMESTAMP) 153 ip_savecontrol(last, &opts, ip, n); 154 if (sbappendaddr(&last->inp_socket->so_rcv, 155 (struct sockaddr *)&ripsrc, n, 156 opts) == 0) { 157 /* should notify about lost packet */ 158 m_freem(n); 159 if (opts) 160 m_freem(opts); 161 } else 162 sorwakeup(last->inp_socket); 163 opts = 0; 164 } 165 } 166 last = inp; 167 } 168 #ifdef IPSEC 169 /* check AH/ESP integrity. */ 170 if (last && ipsec4_in_reject_so(m, last->inp_socket)) { 171 m_freem(m); 172 ipsecstat.in_polvio++; 173 ipstat.ips_delivered--; 174 /* do not inject data to pcb */ 175 } else 176 #endif /*IPSEC*/ 177 if (last) { 178 if (last->inp_flags & INP_CONTROLOPTS || 179 last->inp_socket->so_options & SO_TIMESTAMP) 180 ip_savecontrol(last, &opts, ip, m); 181 if (sbappendaddr(&last->inp_socket->so_rcv, 182 (struct sockaddr *)&ripsrc, m, opts) == 0) { 183 m_freem(m); 184 if (opts) 185 m_freem(opts); 186 } else 187 sorwakeup(last->inp_socket); 188 } else { 189 m_freem(m); 190 ipstat.ips_noproto++; 191 ipstat.ips_delivered--; 192 } 193 } 194 195 /* 196 * Generate IP header and pass packet to ip_output. 197 * Tack on options user may have setup with control call. 198 */ 199 int 200 rip_output(m, so, dst) 201 struct mbuf *m; 202 struct socket *so; 203 u_long dst; 204 { 205 register struct ip *ip; 206 register struct inpcb *inp = sotoinpcb(so); 207 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 208 209 /* 210 * If the user handed us a complete IP packet, use it. 211 * Otherwise, allocate an mbuf for a header and fill it in. 212 */ 213 if ((inp->inp_flags & INP_HDRINCL) == 0) { 214 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 215 m_freem(m); 216 return(EMSGSIZE); 217 } 218 M_PREPEND(m, sizeof(struct ip), M_TRYWAIT); 219 ip = mtod(m, struct ip *); 220 ip->ip_tos = inp->inp_ip_tos; 221 ip->ip_off = 0; 222 ip->ip_p = inp->inp_ip_p; 223 ip->ip_len = m->m_pkthdr.len; 224 ip->ip_src = inp->inp_laddr; 225 ip->ip_dst.s_addr = dst; 226 ip->ip_ttl = inp->inp_ip_ttl; 227 } else { 228 if (m->m_pkthdr.len > IP_MAXPACKET) { 229 m_freem(m); 230 return(EMSGSIZE); 231 } 232 ip = mtod(m, struct ip *); 233 /* don't allow both user specified and setsockopt options, 234 and don't allow packet length sizes that will crash */ 235 if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2)) 236 && inp->inp_options) 237 || (ip->ip_len > m->m_pkthdr.len) 238 || (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) { 239 m_freem(m); 240 return EINVAL; 241 } 242 if (ip->ip_id == 0) 243 #ifdef RANDOM_IP_ID 244 ip->ip_id = ip_randomid(); 245 #else 246 ip->ip_id = htons(ip_id++); 247 #endif 248 /* XXX prevent ip_output from overwriting header fields */ 249 flags |= IP_RAWOUTPUT; 250 ipstat.ips_rawout++; 251 } 252 253 #ifdef IPSEC 254 if (ipsec_setsocket(m, so) != 0) { 255 m_freem(m); 256 return ENOBUFS; 257 } 258 #endif /*IPSEC*/ 259 260 return (ip_output(m, inp->inp_options, &inp->inp_route, flags, 261 inp->inp_moptions)); 262 } 263 264 /* 265 * Raw IP socket option processing. 266 */ 267 int 268 rip_ctloutput(so, sopt) 269 struct socket *so; 270 struct sockopt *sopt; 271 { 272 struct inpcb *inp = sotoinpcb(so); 273 int error, optval; 274 275 if (sopt->sopt_level != IPPROTO_IP) 276 return (EINVAL); 277 278 error = 0; 279 280 switch (sopt->sopt_dir) { 281 case SOPT_GET: 282 switch (sopt->sopt_name) { 283 case IP_HDRINCL: 284 optval = inp->inp_flags & INP_HDRINCL; 285 error = sooptcopyout(sopt, &optval, sizeof optval); 286 break; 287 288 case IP_FW_ADD: 289 case IP_FW_GET: 290 if (ip_fw_ctl_ptr == 0) 291 error = ENOPROTOOPT; 292 else 293 error = ip_fw_ctl_ptr(sopt); 294 break; 295 296 #ifdef DUMMYNET 297 case IP_DUMMYNET_GET: 298 if (ip_dn_ctl_ptr == NULL) 299 error = ENOPROTOOPT ; 300 else 301 error = ip_dn_ctl_ptr(sopt); 302 break ; 303 #endif /* DUMMYNET */ 304 305 case MRT_INIT: 306 case MRT_DONE: 307 case MRT_ADD_VIF: 308 case MRT_DEL_VIF: 309 case MRT_ADD_MFC: 310 case MRT_DEL_MFC: 311 case MRT_VERSION: 312 case MRT_ASSERT: 313 error = ip_mrouter_get(so, sopt); 314 break; 315 316 default: 317 error = ip_ctloutput(so, sopt); 318 break; 319 } 320 break; 321 322 case SOPT_SET: 323 switch (sopt->sopt_name) { 324 case IP_HDRINCL: 325 error = sooptcopyin(sopt, &optval, sizeof optval, 326 sizeof optval); 327 if (error) 328 break; 329 if (optval) 330 inp->inp_flags |= INP_HDRINCL; 331 else 332 inp->inp_flags &= ~INP_HDRINCL; 333 break; 334 335 case IP_FW_ADD: 336 case IP_FW_DEL: 337 case IP_FW_FLUSH: 338 case IP_FW_ZERO: 339 case IP_FW_RESETLOG: 340 if (ip_fw_ctl_ptr == 0) 341 error = ENOPROTOOPT; 342 else 343 error = ip_fw_ctl_ptr(sopt); 344 break; 345 346 #ifdef DUMMYNET 347 case IP_DUMMYNET_CONFIGURE: 348 case IP_DUMMYNET_DEL: 349 case IP_DUMMYNET_FLUSH: 350 if (ip_dn_ctl_ptr == NULL) 351 error = ENOPROTOOPT ; 352 else 353 error = ip_dn_ctl_ptr(sopt); 354 break ; 355 #endif 356 357 case IP_RSVP_ON: 358 error = ip_rsvp_init(so); 359 break; 360 361 case IP_RSVP_OFF: 362 error = ip_rsvp_done(); 363 break; 364 365 /* XXX - should be combined */ 366 case IP_RSVP_VIF_ON: 367 error = ip_rsvp_vif_init(so, sopt); 368 break; 369 370 case IP_RSVP_VIF_OFF: 371 error = ip_rsvp_vif_done(so, sopt); 372 break; 373 374 case MRT_INIT: 375 case MRT_DONE: 376 case MRT_ADD_VIF: 377 case MRT_DEL_VIF: 378 case MRT_ADD_MFC: 379 case MRT_DEL_MFC: 380 case MRT_VERSION: 381 case MRT_ASSERT: 382 error = ip_mrouter_set(so, sopt); 383 break; 384 385 default: 386 error = ip_ctloutput(so, sopt); 387 break; 388 } 389 break; 390 } 391 392 return (error); 393 } 394 395 /* 396 * This function exists solely to receive the PRC_IFDOWN messages which 397 * are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, 398 * and calls in_ifadown() to remove all routes corresponding to that address. 399 * It also receives the PRC_IFUP messages from if_up() and reinstalls the 400 * interface routes. 401 */ 402 void 403 rip_ctlinput(cmd, sa, vip) 404 int cmd; 405 struct sockaddr *sa; 406 void *vip; 407 { 408 struct in_ifaddr *ia; 409 struct ifnet *ifp; 410 int err; 411 int flags; 412 413 switch (cmd) { 414 case PRC_IFDOWN: 415 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 416 if (ia->ia_ifa.ifa_addr == sa 417 && (ia->ia_flags & IFA_ROUTE)) { 418 /* 419 * in_ifscrub kills the interface route. 420 */ 421 in_ifscrub(ia->ia_ifp, ia); 422 /* 423 * in_ifadown gets rid of all the rest of 424 * the routes. This is not quite the right 425 * thing to do, but at least if we are running 426 * a routing process they will come back. 427 */ 428 in_ifadown(&ia->ia_ifa, 0); 429 break; 430 } 431 } 432 break; 433 434 case PRC_IFUP: 435 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 436 if (ia->ia_ifa.ifa_addr == sa) 437 break; 438 } 439 if (ia == 0 || (ia->ia_flags & IFA_ROUTE)) 440 return; 441 flags = RTF_UP; 442 ifp = ia->ia_ifa.ifa_ifp; 443 444 if ((ifp->if_flags & IFF_LOOPBACK) 445 || (ifp->if_flags & IFF_POINTOPOINT)) 446 flags |= RTF_HOST; 447 448 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 449 if (err == 0) 450 ia->ia_flags |= IFA_ROUTE; 451 break; 452 } 453 } 454 455 u_long rip_sendspace = RIPSNDQ; 456 u_long rip_recvspace = RIPRCVQ; 457 458 SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 459 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 460 SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 461 &rip_recvspace, 0, "Maximum incoming raw IP datagram size"); 462 463 static int 464 rip_attach(struct socket *so, int proto, struct proc *p) 465 { 466 struct inpcb *inp; 467 int error, s; 468 469 inp = sotoinpcb(so); 470 if (inp) 471 panic("rip_attach"); 472 if (p && (error = suser(p)) != 0) 473 return error; 474 475 error = soreserve(so, rip_sendspace, rip_recvspace); 476 if (error) 477 return error; 478 s = splnet(); 479 error = in_pcballoc(so, &ripcbinfo, p); 480 splx(s); 481 if (error) 482 return error; 483 inp = (struct inpcb *)so->so_pcb; 484 inp->inp_vflag |= INP_IPV4; 485 inp->inp_ip_p = proto; 486 inp->inp_ip_ttl = ip_defttl; 487 return 0; 488 } 489 490 static int 491 rip_detach(struct socket *so) 492 { 493 struct inpcb *inp; 494 495 inp = sotoinpcb(so); 496 if (inp == 0) 497 panic("rip_detach"); 498 if (so == ip_mrouter) 499 ip_mrouter_done(); 500 ip_rsvp_force_done(so); 501 if (so == ip_rsvpd) 502 ip_rsvp_done(); 503 in_pcbdetach(inp); 504 return 0; 505 } 506 507 static int 508 rip_abort(struct socket *so) 509 { 510 soisdisconnected(so); 511 return rip_detach(so); 512 } 513 514 static int 515 rip_disconnect(struct socket *so) 516 { 517 if ((so->so_state & SS_ISCONNECTED) == 0) 518 return ENOTCONN; 519 return rip_abort(so); 520 } 521 522 static int 523 rip_bind(struct socket *so, struct sockaddr *nam, struct proc *p) 524 { 525 struct inpcb *inp = sotoinpcb(so); 526 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 527 528 if (nam->sa_len != sizeof(*addr)) 529 return EINVAL; 530 531 if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) && 532 (addr->sin_family != AF_IMPLINK)) || 533 (addr->sin_addr.s_addr && 534 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) 535 return EADDRNOTAVAIL; 536 inp->inp_laddr = addr->sin_addr; 537 return 0; 538 } 539 540 static int 541 rip_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 542 { 543 struct inpcb *inp = sotoinpcb(so); 544 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 545 546 if (nam->sa_len != sizeof(*addr)) 547 return EINVAL; 548 if (TAILQ_EMPTY(&ifnet)) 549 return EADDRNOTAVAIL; 550 if ((addr->sin_family != AF_INET) && 551 (addr->sin_family != AF_IMPLINK)) 552 return EAFNOSUPPORT; 553 inp->inp_faddr = addr->sin_addr; 554 soisconnected(so); 555 return 0; 556 } 557 558 static int 559 rip_shutdown(struct socket *so) 560 { 561 socantsendmore(so); 562 return 0; 563 } 564 565 static int 566 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 567 struct mbuf *control, struct proc *p) 568 { 569 struct inpcb *inp = sotoinpcb(so); 570 register u_long dst; 571 572 if (so->so_state & SS_ISCONNECTED) { 573 if (nam) { 574 m_freem(m); 575 return EISCONN; 576 } 577 dst = inp->inp_faddr.s_addr; 578 } else { 579 if (nam == NULL) { 580 m_freem(m); 581 return ENOTCONN; 582 } 583 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 584 } 585 return rip_output(m, so, dst); 586 } 587 588 static int 589 rip_pcblist(SYSCTL_HANDLER_ARGS) 590 { 591 int error, i, n, s; 592 struct inpcb *inp, **inp_list; 593 inp_gen_t gencnt; 594 struct xinpgen xig; 595 596 /* 597 * The process of preparing the TCB list is too time-consuming and 598 * resource-intensive to repeat twice on every request. 599 */ 600 if (req->oldptr == 0) { 601 n = ripcbinfo.ipi_count; 602 req->oldidx = 2 * (sizeof xig) 603 + (n + n/8) * sizeof(struct xinpcb); 604 return 0; 605 } 606 607 if (req->newptr != 0) 608 return EPERM; 609 610 /* 611 * OK, now we're committed to doing something. 612 */ 613 s = splnet(); 614 gencnt = ripcbinfo.ipi_gencnt; 615 n = ripcbinfo.ipi_count; 616 splx(s); 617 618 xig.xig_len = sizeof xig; 619 xig.xig_count = n; 620 xig.xig_gen = gencnt; 621 xig.xig_sogen = so_gencnt; 622 error = SYSCTL_OUT(req, &xig, sizeof xig); 623 if (error) 624 return error; 625 626 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 627 if (inp_list == 0) 628 return ENOMEM; 629 630 s = splnet(); 631 for (inp = LIST_FIRST(ripcbinfo.listhead), i = 0; inp && i < n; 632 inp = LIST_NEXT(inp, inp_list)) { 633 if (inp->inp_gencnt <= gencnt) 634 inp_list[i++] = inp; 635 } 636 splx(s); 637 n = i; 638 639 error = 0; 640 for (i = 0; i < n; i++) { 641 inp = inp_list[i]; 642 if (inp->inp_gencnt <= gencnt) { 643 struct xinpcb xi; 644 xi.xi_len = sizeof xi; 645 /* XXX should avoid extra copy */ 646 bcopy(inp, &xi.xi_inp, sizeof *inp); 647 if (inp->inp_socket) 648 sotoxsocket(inp->inp_socket, &xi.xi_socket); 649 error = SYSCTL_OUT(req, &xi, sizeof xi); 650 } 651 } 652 if (!error) { 653 /* 654 * Give the user an updated idea of our state. 655 * If the generation differs from what we told 656 * her before, she knows that something happened 657 * while we were processing this request, and it 658 * might be necessary to retry. 659 */ 660 s = splnet(); 661 xig.xig_gen = ripcbinfo.ipi_gencnt; 662 xig.xig_sogen = so_gencnt; 663 xig.xig_count = ripcbinfo.ipi_count; 664 splx(s); 665 error = SYSCTL_OUT(req, &xig, sizeof xig); 666 } 667 free(inp_list, M_TEMP); 668 return error; 669 } 670 671 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0, 672 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 673 674 struct pr_usrreqs rip_usrreqs = { 675 rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect, 676 pru_connect2_notsupp, in_control, rip_detach, rip_disconnect, 677 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp, 678 pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown, 679 in_setsockaddr, sosend, soreceive, sopoll 680 }; 681