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