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 * $Id: raw_ip.c,v 1.55 1998/08/23 03:07:14 wollman Exp $ 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 #if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1 69 #undef COMPAT_IPFW 70 #define COMPAT_IPFW 1 71 #else 72 #undef COMPAT_IPFW 73 #endif 74 75 static struct inpcbhead ripcb; 76 static 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, iphlen) 115 struct mbuf *m; 116 int iphlen; 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 for (inp = ripcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) { 125 if (inp->inp_ip_p && inp->inp_ip_p != ip->ip_p) 126 continue; 127 if (inp->inp_laddr.s_addr && 128 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 129 continue; 130 if (inp->inp_faddr.s_addr && 131 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 132 continue; 133 if (last) { 134 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 135 if (n) { 136 if (last->inp_flags & INP_CONTROLOPTS || 137 last->inp_socket->so_options & SO_TIMESTAMP) 138 ip_savecontrol(last, &opts, ip, n); 139 if (sbappendaddr(&last->inp_socket->so_rcv, 140 (struct sockaddr *)&ripsrc, n, 141 opts) == 0) { 142 /* should notify about lost packet */ 143 m_freem(n); 144 if (opts) 145 m_freem(opts); 146 } else 147 sorwakeup(last->inp_socket); 148 opts = 0; 149 } 150 } 151 last = inp; 152 } 153 if (last) { 154 if (last->inp_flags & INP_CONTROLOPTS || 155 last->inp_socket->so_options & SO_TIMESTAMP) 156 ip_savecontrol(last, &opts, ip, m); 157 if (sbappendaddr(&last->inp_socket->so_rcv, 158 (struct sockaddr *)&ripsrc, m, opts) == 0) { 159 m_freem(m); 160 if (opts) 161 m_freem(opts); 162 } else 163 sorwakeup(last->inp_socket); 164 } else { 165 m_freem(m); 166 ipstat.ips_noproto++; 167 ipstat.ips_delivered--; 168 } 169 } 170 171 /* 172 * Generate IP header and pass packet to ip_output. 173 * Tack on options user may have setup with control call. 174 */ 175 int 176 rip_output(m, so, dst) 177 register struct mbuf *m; 178 struct socket *so; 179 u_long dst; 180 { 181 register struct ip *ip; 182 register struct inpcb *inp = sotoinpcb(so); 183 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 184 185 /* 186 * If the user handed us a complete IP packet, use it. 187 * Otherwise, allocate an mbuf for a header and fill it in. 188 */ 189 if ((inp->inp_flags & INP_HDRINCL) == 0) { 190 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 191 m_freem(m); 192 return(EMSGSIZE); 193 } 194 M_PREPEND(m, sizeof(struct ip), M_WAIT); 195 ip = mtod(m, struct ip *); 196 ip->ip_tos = 0; 197 ip->ip_off = 0; 198 ip->ip_p = inp->inp_ip_p; 199 ip->ip_len = m->m_pkthdr.len; 200 ip->ip_src = inp->inp_laddr; 201 ip->ip_dst.s_addr = dst; 202 ip->ip_ttl = MAXTTL; 203 } else { 204 if (m->m_pkthdr.len > IP_MAXPACKET) { 205 m_freem(m); 206 return(EMSGSIZE); 207 } 208 ip = mtod(m, struct ip *); 209 /* don't allow both user specified and setsockopt options, 210 and don't allow packet length sizes that will crash */ 211 if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2)) 212 && inp->inp_options) 213 || (ip->ip_len > m->m_pkthdr.len) 214 || (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) { 215 m_freem(m); 216 return EINVAL; 217 } 218 if (ip->ip_id == 0) 219 ip->ip_id = htons(ip_id++); 220 /* XXX prevent ip_output from overwriting header fields */ 221 flags |= IP_RAWOUTPUT; 222 ipstat.ips_rawout++; 223 } 224 return (ip_output(m, inp->inp_options, &inp->inp_route, flags, 225 inp->inp_moptions)); 226 } 227 228 /* 229 * Raw IP socket option processing. 230 */ 231 int 232 rip_ctloutput(so, sopt) 233 struct socket *so; 234 struct sockopt *sopt; 235 { 236 struct inpcb *inp = sotoinpcb(so); 237 int error, optval; 238 239 if (sopt->sopt_level != IPPROTO_IP) 240 return (EINVAL); 241 242 error = 0; 243 244 switch (sopt->sopt_dir) { 245 case SOPT_GET: 246 switch (sopt->sopt_name) { 247 case IP_HDRINCL: 248 optval = inp->inp_flags & INP_HDRINCL; 249 error = sooptcopyout(sopt, &optval, sizeof optval); 250 break; 251 252 #ifdef COMPAT_IPFW 253 case IP_FW_GET: 254 if (ip_fw_ctl_ptr == 0) 255 error = ENOPROTOOPT; 256 else 257 error = ip_fw_ctl_ptr(sopt); 258 break; 259 260 case IP_NAT: 261 if (ip_nat_ctl_ptr == 0) 262 error = ENOPROTOOPT; 263 else 264 error = ip_nat_ctl_ptr(sopt); 265 break; 266 #ifdef DUMMYNET 267 case IP_DUMMYNET_GET: 268 if (ip_dn_ctl_ptr == NULL) 269 error = ENOPROTOOPT ; 270 else 271 error = ip_dn_ctl_ptr(sopt); 272 break ; 273 #endif /* DUMMYNET */ 274 #endif /* COMPAT_IPFW */ 275 276 case MRT_INIT: 277 case MRT_DONE: 278 case MRT_ADD_VIF: 279 case MRT_DEL_VIF: 280 case MRT_ADD_MFC: 281 case MRT_DEL_MFC: 282 case MRT_VERSION: 283 case MRT_ASSERT: 284 error = ip_mrouter_get(so, sopt); 285 break; 286 287 default: 288 error = ip_ctloutput(so, sopt); 289 break; 290 } 291 break; 292 293 case SOPT_SET: 294 switch (sopt->sopt_name) { 295 case IP_HDRINCL: 296 error = sooptcopyin(sopt, &optval, sizeof optval, 297 sizeof optval); 298 if (error) 299 break; 300 if (optval) 301 inp->inp_flags |= INP_HDRINCL; 302 else 303 inp->inp_flags &= ~INP_HDRINCL; 304 break; 305 306 #ifdef COMPAT_IPFW 307 case IP_FW_ADD: 308 case IP_FW_DEL: 309 case IP_FW_FLUSH: 310 case IP_FW_ZERO: 311 if (ip_fw_ctl_ptr == 0) 312 error = ENOPROTOOPT; 313 else 314 error = ip_fw_ctl_ptr(sopt); 315 break; 316 317 case IP_NAT: 318 if (ip_nat_ctl_ptr == 0) 319 error = ENOPROTOOPT; 320 else 321 error = ip_nat_ctl_ptr(sopt); 322 break; 323 #ifdef DUMMYNET 324 case IP_DUMMYNET_CONFIGURE: 325 case IP_DUMMYNET_DEL: 326 case IP_DUMMYNET_FLUSH: 327 if (ip_dn_ctl_ptr == NULL) 328 error = ENOPROTOOPT ; 329 else 330 error = ip_dn_ctl_ptr(sopt); 331 break ; 332 #endif 333 #endif /* COMPAT_IPFW */ 334 335 case IP_RSVP_ON: 336 error = ip_rsvp_init(so); 337 break; 338 339 case IP_RSVP_OFF: 340 error = ip_rsvp_done(); 341 break; 342 343 /* XXX - should be combined */ 344 case IP_RSVP_VIF_ON: 345 error = ip_rsvp_vif_init(so, sopt); 346 break; 347 348 case IP_RSVP_VIF_OFF: 349 error = ip_rsvp_vif_done(so, sopt); 350 break; 351 352 case MRT_INIT: 353 case MRT_DONE: 354 case MRT_ADD_VIF: 355 case MRT_DEL_VIF: 356 case MRT_ADD_MFC: 357 case MRT_DEL_MFC: 358 case MRT_VERSION: 359 case MRT_ASSERT: 360 error = ip_mrouter_set(so, sopt); 361 break; 362 363 default: 364 error = ip_ctloutput(so, sopt); 365 break; 366 } 367 break; 368 } 369 370 return (error); 371 } 372 373 /* 374 * This function exists solely to receive the PRC_IFDOWN messages which 375 * are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, 376 * and calls in_ifadown() to remove all routes corresponding to that address. 377 * It also receives the PRC_IFUP messages from if_up() and reinstalls the 378 * interface routes. 379 */ 380 void 381 rip_ctlinput(cmd, sa, vip) 382 int cmd; 383 struct sockaddr *sa; 384 void *vip; 385 { 386 struct in_ifaddr *ia; 387 struct ifnet *ifp; 388 int err; 389 int flags; 390 391 switch (cmd) { 392 case PRC_IFDOWN: 393 for (ia = in_ifaddrhead.tqh_first; ia; 394 ia = ia->ia_link.tqe_next) { 395 if (ia->ia_ifa.ifa_addr == sa 396 && (ia->ia_flags & IFA_ROUTE)) { 397 /* 398 * in_ifscrub kills the interface route. 399 */ 400 in_ifscrub(ia->ia_ifp, ia); 401 /* 402 * in_ifadown gets rid of all the rest of 403 * the routes. This is not quite the right 404 * thing to do, but at least if we are running 405 * a routing process they will come back. 406 */ 407 in_ifadown(&ia->ia_ifa); 408 break; 409 } 410 } 411 break; 412 413 case PRC_IFUP: 414 for (ia = in_ifaddrhead.tqh_first; ia; 415 ia = ia->ia_link.tqe_next) { 416 if (ia->ia_ifa.ifa_addr == sa) 417 break; 418 } 419 if (ia == 0 || (ia->ia_flags & IFA_ROUTE)) 420 return; 421 flags = RTF_UP; 422 ifp = ia->ia_ifa.ifa_ifp; 423 424 if ((ifp->if_flags & IFF_LOOPBACK) 425 || (ifp->if_flags & IFF_POINTOPOINT)) 426 flags |= RTF_HOST; 427 428 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 429 if (err == 0) 430 ia->ia_flags |= IFA_ROUTE; 431 break; 432 } 433 } 434 435 static u_long rip_sendspace = RIPSNDQ; 436 static u_long rip_recvspace = RIPRCVQ; 437 438 SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, &rip_sendspace, 439 0, ""); 440 SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, &rip_recvspace, 441 0, ""); 442 443 static int 444 rip_attach(struct socket *so, int proto, struct proc *p) 445 { 446 struct inpcb *inp; 447 int error, s; 448 449 inp = sotoinpcb(so); 450 if (inp) 451 panic("rip_attach"); 452 if (p && (error = suser(p->p_ucred, &p->p_acflag)) != 0) 453 return error; 454 455 s = splnet(); 456 error = in_pcballoc(so, &ripcbinfo, p); 457 splx(s); 458 if (error) 459 return error; 460 error = soreserve(so, rip_sendspace, rip_recvspace); 461 if (error) 462 return error; 463 inp = (struct inpcb *)so->so_pcb; 464 inp->inp_ip_p = proto; 465 return 0; 466 } 467 468 static int 469 rip_detach(struct socket *so) 470 { 471 struct inpcb *inp; 472 473 inp = sotoinpcb(so); 474 if (inp == 0) 475 panic("rip_detach"); 476 if (so == ip_mrouter) 477 ip_mrouter_done(); 478 ip_rsvp_force_done(so); 479 if (so == ip_rsvpd) 480 ip_rsvp_done(); 481 in_pcbdetach(inp); 482 return 0; 483 } 484 485 static int 486 rip_abort(struct socket *so) 487 { 488 soisdisconnected(so); 489 return rip_detach(so); 490 } 491 492 static int 493 rip_disconnect(struct socket *so) 494 { 495 if ((so->so_state & SS_ISCONNECTED) == 0) 496 return ENOTCONN; 497 return rip_abort(so); 498 } 499 500 static int 501 rip_bind(struct socket *so, struct sockaddr *nam, struct proc *p) 502 { 503 struct inpcb *inp = sotoinpcb(so); 504 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 505 506 if (nam->sa_len != sizeof(*addr)) 507 return EINVAL; 508 509 if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) && 510 (addr->sin_family != AF_IMPLINK)) || 511 (addr->sin_addr.s_addr && 512 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) 513 return EADDRNOTAVAIL; 514 inp->inp_laddr = addr->sin_addr; 515 return 0; 516 } 517 518 static int 519 rip_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 520 { 521 struct inpcb *inp = sotoinpcb(so); 522 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 523 524 if (nam->sa_len != sizeof(*addr)) 525 return EINVAL; 526 if (TAILQ_EMPTY(&ifnet)) 527 return EADDRNOTAVAIL; 528 if ((addr->sin_family != AF_INET) && 529 (addr->sin_family != AF_IMPLINK)) 530 return EAFNOSUPPORT; 531 inp->inp_faddr = addr->sin_addr; 532 soisconnected(so); 533 return 0; 534 } 535 536 static int 537 rip_shutdown(struct socket *so) 538 { 539 socantsendmore(so); 540 return 0; 541 } 542 543 static int 544 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 545 struct mbuf *control, struct proc *p) 546 { 547 struct inpcb *inp = sotoinpcb(so); 548 register u_long dst; 549 550 if (so->so_state & SS_ISCONNECTED) { 551 if (nam) { 552 m_freem(m); 553 return EISCONN; 554 } 555 dst = inp->inp_faddr.s_addr; 556 } else { 557 if (nam == NULL) { 558 m_freem(m); 559 return ENOTCONN; 560 } 561 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 562 } 563 return rip_output(m, so, dst); 564 } 565 566 static int 567 rip_pcblist SYSCTL_HANDLER_ARGS 568 { 569 int error, i, n, s; 570 struct inpcb *inp, **inp_list; 571 inp_gen_t gencnt; 572 struct xinpgen xig; 573 574 /* 575 * The process of preparing the TCB list is too time-consuming and 576 * resource-intensive to repeat twice on every request. 577 */ 578 if (req->oldptr == 0) { 579 n = ripcbinfo.ipi_count; 580 req->oldidx = 2 * (sizeof xig) 581 + (n + n/8) * sizeof(struct xinpcb); 582 return 0; 583 } 584 585 if (req->newptr != 0) 586 return EPERM; 587 588 /* 589 * OK, now we're committed to doing something. 590 */ 591 s = splnet(); 592 gencnt = ripcbinfo.ipi_gencnt; 593 n = ripcbinfo.ipi_count; 594 splx(s); 595 596 xig.xig_len = sizeof xig; 597 xig.xig_count = n; 598 xig.xig_gen = gencnt; 599 xig.xig_sogen = so_gencnt; 600 error = SYSCTL_OUT(req, &xig, sizeof xig); 601 if (error) 602 return error; 603 604 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 605 if (inp_list == 0) 606 return ENOMEM; 607 608 s = splnet(); 609 for (inp = ripcbinfo.listhead->lh_first, i = 0; inp && i < n; 610 inp = inp->inp_list.le_next) { 611 if (inp->inp_gencnt <= gencnt) 612 inp_list[i++] = inp; 613 } 614 splx(s); 615 n = i; 616 617 error = 0; 618 for (i = 0; i < n; i++) { 619 inp = inp_list[i]; 620 if (inp->inp_gencnt <= gencnt) { 621 struct xinpcb xi; 622 xi.xi_len = sizeof xi; 623 /* XXX should avoid extra copy */ 624 bcopy(inp, &xi.xi_inp, sizeof *inp); 625 if (inp->inp_socket) 626 sotoxsocket(inp->inp_socket, &xi.xi_socket); 627 error = SYSCTL_OUT(req, &xi, sizeof xi); 628 } 629 } 630 if (!error) { 631 /* 632 * Give the user an updated idea of our state. 633 * If the generation differs from what we told 634 * her before, she knows that something happened 635 * while we were processing this request, and it 636 * might be necessary to retry. 637 */ 638 s = splnet(); 639 xig.xig_gen = ripcbinfo.ipi_gencnt; 640 xig.xig_sogen = so_gencnt; 641 xig.xig_count = ripcbinfo.ipi_count; 642 splx(s); 643 error = SYSCTL_OUT(req, &xig, sizeof xig); 644 } 645 free(inp_list, M_TEMP); 646 return error; 647 } 648 649 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0, 650 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 651 652 struct pr_usrreqs rip_usrreqs = { 653 rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect, 654 pru_connect2_notsupp, in_control, rip_detach, rip_disconnect, 655 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp, 656 pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown, 657 in_setsockaddr, sosend, soreceive, sopoll 658 }; 659