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