raw_ip.c revision 67893
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: head/sys/netinet/raw_ip.c 67893 2000-10-29 16:06:56Z phk $ 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 75struct inpcbhead ripcb; 76struct 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 */ 91void 92rip_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 107static 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 */ 113void 114rip_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 */ 179int 180rip_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_WAIT); 199 ip = mtod(m, struct ip *); 200 ip->ip_tos = 0; 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 = MAXTTL; 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 */ 240int 241rip_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 */ 375void 376rip_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 for (ia = in_ifaddrhead.tqh_first; ia; 389 ia = ia->ia_link.tqe_next) { 390 if (ia->ia_ifa.ifa_addr == sa 391 && (ia->ia_flags & IFA_ROUTE)) { 392 /* 393 * in_ifscrub kills the interface route. 394 */ 395 in_ifscrub(ia->ia_ifp, ia); 396 /* 397 * in_ifadown gets rid of all the rest of 398 * the routes. This is not quite the right 399 * thing to do, but at least if we are running 400 * a routing process they will come back. 401 */ 402 in_ifadown(&ia->ia_ifa); 403 break; 404 } 405 } 406 break; 407 408 case PRC_IFUP: 409 for (ia = in_ifaddrhead.tqh_first; ia; 410 ia = ia->ia_link.tqe_next) { 411 if (ia->ia_ifa.ifa_addr == sa) 412 break; 413 } 414 if (ia == 0 || (ia->ia_flags & IFA_ROUTE)) 415 return; 416 flags = RTF_UP; 417 ifp = ia->ia_ifa.ifa_ifp; 418 419 if ((ifp->if_flags & IFF_LOOPBACK) 420 || (ifp->if_flags & IFF_POINTOPOINT)) 421 flags |= RTF_HOST; 422 423 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 424 if (err == 0) 425 ia->ia_flags |= IFA_ROUTE; 426 break; 427 } 428} 429 430u_long rip_sendspace = RIPSNDQ; 431u_long rip_recvspace = RIPRCVQ; 432 433SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, 434 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size"); 435SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, 436 &rip_recvspace, 0, "Maximum incoming raw IP datagram size"); 437 438static int 439rip_attach(struct socket *so, int proto, struct proc *p) 440{ 441 struct inpcb *inp; 442 int error, s; 443 444 inp = sotoinpcb(so); 445 if (inp) 446 panic("rip_attach"); 447 if (p && (error = suser(p)) != 0) 448 return error; 449 450 error = soreserve(so, rip_sendspace, rip_recvspace); 451 if (error) 452 return error; 453 s = splnet(); 454 error = in_pcballoc(so, &ripcbinfo, p); 455 splx(s); 456 if (error) 457 return error; 458 inp = (struct inpcb *)so->so_pcb; 459 inp->inp_vflag |= INP_IPV4; 460 inp->inp_ip_p = proto; 461#ifdef IPSEC 462 error = ipsec_init_policy(so, &inp->inp_sp); 463 if (error != 0) { 464 in_pcbdetach(inp); 465 return error; 466 } 467#endif /*IPSEC*/ 468 return 0; 469} 470 471static int 472rip_detach(struct socket *so) 473{ 474 struct inpcb *inp; 475 476 inp = sotoinpcb(so); 477 if (inp == 0) 478 panic("rip_detach"); 479 if (so == ip_mrouter) 480 ip_mrouter_done(); 481 ip_rsvp_force_done(so); 482 if (so == ip_rsvpd) 483 ip_rsvp_done(); 484 in_pcbdetach(inp); 485 return 0; 486} 487 488static int 489rip_abort(struct socket *so) 490{ 491 soisdisconnected(so); 492 return rip_detach(so); 493} 494 495static int 496rip_disconnect(struct socket *so) 497{ 498 if ((so->so_state & SS_ISCONNECTED) == 0) 499 return ENOTCONN; 500 return rip_abort(so); 501} 502 503static int 504rip_bind(struct socket *so, struct sockaddr *nam, struct proc *p) 505{ 506 struct inpcb *inp = sotoinpcb(so); 507 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 508 509 if (nam->sa_len != sizeof(*addr)) 510 return EINVAL; 511 512 if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) && 513 (addr->sin_family != AF_IMPLINK)) || 514 (addr->sin_addr.s_addr && 515 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) 516 return EADDRNOTAVAIL; 517 inp->inp_laddr = addr->sin_addr; 518 return 0; 519} 520 521static int 522rip_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 523{ 524 struct inpcb *inp = sotoinpcb(so); 525 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 526 527 if (nam->sa_len != sizeof(*addr)) 528 return EINVAL; 529 if (TAILQ_EMPTY(&ifnet)) 530 return EADDRNOTAVAIL; 531 if ((addr->sin_family != AF_INET) && 532 (addr->sin_family != AF_IMPLINK)) 533 return EAFNOSUPPORT; 534 inp->inp_faddr = addr->sin_addr; 535 soisconnected(so); 536 return 0; 537} 538 539static int 540rip_shutdown(struct socket *so) 541{ 542 socantsendmore(so); 543 return 0; 544} 545 546static int 547rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 548 struct mbuf *control, struct proc *p) 549{ 550 struct inpcb *inp = sotoinpcb(so); 551 register u_long dst; 552 553 if (so->so_state & SS_ISCONNECTED) { 554 if (nam) { 555 m_freem(m); 556 return EISCONN; 557 } 558 dst = inp->inp_faddr.s_addr; 559 } else { 560 if (nam == NULL) { 561 m_freem(m); 562 return ENOTCONN; 563 } 564 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 565 } 566 return rip_output(m, so, dst); 567} 568 569static int 570rip_pcblist(SYSCTL_HANDLER_ARGS) 571{ 572 int error, i, n, s; 573 struct inpcb *inp, **inp_list; 574 inp_gen_t gencnt; 575 struct xinpgen xig; 576 577 /* 578 * The process of preparing the TCB list is too time-consuming and 579 * resource-intensive to repeat twice on every request. 580 */ 581 if (req->oldptr == 0) { 582 n = ripcbinfo.ipi_count; 583 req->oldidx = 2 * (sizeof xig) 584 + (n + n/8) * sizeof(struct xinpcb); 585 return 0; 586 } 587 588 if (req->newptr != 0) 589 return EPERM; 590 591 /* 592 * OK, now we're committed to doing something. 593 */ 594 s = splnet(); 595 gencnt = ripcbinfo.ipi_gencnt; 596 n = ripcbinfo.ipi_count; 597 splx(s); 598 599 xig.xig_len = sizeof xig; 600 xig.xig_count = n; 601 xig.xig_gen = gencnt; 602 xig.xig_sogen = so_gencnt; 603 error = SYSCTL_OUT(req, &xig, sizeof xig); 604 if (error) 605 return error; 606 607 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 608 if (inp_list == 0) 609 return ENOMEM; 610 611 s = splnet(); 612 for (inp = ripcbinfo.listhead->lh_first, i = 0; inp && i < n; 613 inp = inp->inp_list.le_next) { 614 if (inp->inp_gencnt <= gencnt) 615 inp_list[i++] = inp; 616 } 617 splx(s); 618 n = i; 619 620 error = 0; 621 for (i = 0; i < n; i++) { 622 inp = inp_list[i]; 623 if (inp->inp_gencnt <= gencnt) { 624 struct xinpcb xi; 625 xi.xi_len = sizeof xi; 626 /* XXX should avoid extra copy */ 627 bcopy(inp, &xi.xi_inp, sizeof *inp); 628 if (inp->inp_socket) 629 sotoxsocket(inp->inp_socket, &xi.xi_socket); 630 error = SYSCTL_OUT(req, &xi, sizeof xi); 631 } 632 } 633 if (!error) { 634 /* 635 * Give the user an updated idea of our state. 636 * If the generation differs from what we told 637 * her before, she knows that something happened 638 * while we were processing this request, and it 639 * might be necessary to retry. 640 */ 641 s = splnet(); 642 xig.xig_gen = ripcbinfo.ipi_gencnt; 643 xig.xig_sogen = so_gencnt; 644 xig.xig_count = ripcbinfo.ipi_count; 645 splx(s); 646 error = SYSCTL_OUT(req, &xig, sizeof xig); 647 } 648 free(inp_list, M_TEMP); 649 return error; 650} 651 652SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0, 653 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 654 655struct pr_usrreqs rip_usrreqs = { 656 rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect, 657 pru_connect2_notsupp, in_control, rip_detach, rip_disconnect, 658 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp, 659 pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown, 660 in_setsockaddr, sosend, soreceive, sopoll 661}; 662