raw_ip.c revision 38482
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 1.54 1998/05/15 20:11:34 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#if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1 65#undef COMPAT_IPFW 66#define COMPAT_IPFW 1 67#else 68#undef COMPAT_IPFW 69#endif 70 71static struct inpcbhead ripcb; 72static struct inpcbinfo ripcbinfo; 73 74/* 75 * Nominal space allocated to a raw ip socket. 76 */ 77#define RIPSNDQ 8192 78#define RIPRCVQ 8192 79 80/* 81 * Raw interface to IP protocol. 82 */ 83 84/* 85 * Initialize raw connection block q. 86 */ 87void 88rip_init() 89{ 90 LIST_INIT(&ripcb); 91 ripcbinfo.listhead = &ripcb; 92 /* 93 * XXX We don't use the hash list for raw IP, but it's easier 94 * to allocate a one entry hash list than it is to check all 95 * over the place for hashbase == NULL. 96 */ 97 ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask); 98 ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask); 99 ripcbinfo.ipi_zone = zinit("ripcb", sizeof(struct inpcb), 100 maxsockets, ZONE_INTERRUPT, 0); 101} 102 103static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 104/* 105 * Setup generic address and protocol structures 106 * for raw_input routine, then pass them along with 107 * mbuf chain. 108 */ 109void 110rip_input(m, iphlen) 111 struct mbuf *m; 112 int iphlen; 113{ 114 register struct ip *ip = mtod(m, struct ip *); 115 register struct inpcb *inp; 116 struct inpcb *last = 0; 117 struct mbuf *opts = 0; 118 119 ripsrc.sin_addr = ip->ip_src; 120 for (inp = ripcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) { 121 if (inp->inp_ip_p && inp->inp_ip_p != ip->ip_p) 122 continue; 123 if (inp->inp_laddr.s_addr && 124 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 125 continue; 126 if (inp->inp_faddr.s_addr && 127 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 128 continue; 129 if (last) { 130 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 131 if (n) { 132 if (last->inp_flags & INP_CONTROLOPTS || 133 last->inp_socket->so_options & SO_TIMESTAMP) 134 ip_savecontrol(last, &opts, ip, n); 135 if (sbappendaddr(&last->inp_socket->so_rcv, 136 (struct sockaddr *)&ripsrc, n, 137 opts) == 0) { 138 /* should notify about lost packet */ 139 m_freem(n); 140 if (opts) 141 m_freem(opts); 142 } else 143 sorwakeup(last->inp_socket); 144 opts = 0; 145 } 146 } 147 last = inp; 148 } 149 if (last) { 150 if (last->inp_flags & INP_CONTROLOPTS || 151 last->inp_socket->so_options & SO_TIMESTAMP) 152 ip_savecontrol(last, &opts, ip, m); 153 if (sbappendaddr(&last->inp_socket->so_rcv, 154 (struct sockaddr *)&ripsrc, m, opts) == 0) { 155 m_freem(m); 156 if (opts) 157 m_freem(opts); 158 } else 159 sorwakeup(last->inp_socket); 160 } else { 161 m_freem(m); 162 ipstat.ips_noproto++; 163 ipstat.ips_delivered--; 164 } 165} 166 167/* 168 * Generate IP header and pass packet to ip_output. 169 * Tack on options user may have setup with control call. 170 */ 171int 172rip_output(m, so, dst) 173 register struct mbuf *m; 174 struct socket *so; 175 u_long dst; 176{ 177 register struct ip *ip; 178 register struct inpcb *inp = sotoinpcb(so); 179 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 180 181 /* 182 * If the user handed us a complete IP packet, use it. 183 * Otherwise, allocate an mbuf for a header and fill it in. 184 */ 185 if ((inp->inp_flags & INP_HDRINCL) == 0) { 186 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 187 m_freem(m); 188 return(EMSGSIZE); 189 } 190 M_PREPEND(m, sizeof(struct ip), M_WAIT); 191 ip = mtod(m, struct ip *); 192 ip->ip_tos = 0; 193 ip->ip_off = 0; 194 ip->ip_p = inp->inp_ip_p; 195 ip->ip_len = m->m_pkthdr.len; 196 ip->ip_src = inp->inp_laddr; 197 ip->ip_dst.s_addr = dst; 198 ip->ip_ttl = MAXTTL; 199 } else { 200 if (m->m_pkthdr.len > IP_MAXPACKET) { 201 m_freem(m); 202 return(EMSGSIZE); 203 } 204 ip = mtod(m, struct ip *); 205 /* don't allow both user specified and setsockopt options, 206 and don't allow packet length sizes that will crash */ 207 if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2)) 208 && inp->inp_options) 209 || (ip->ip_len > m->m_pkthdr.len) 210 || (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) { 211 m_freem(m); 212 return EINVAL; 213 } 214 if (ip->ip_id == 0) 215 ip->ip_id = htons(ip_id++); 216 /* XXX prevent ip_output from overwriting header fields */ 217 flags |= IP_RAWOUTPUT; 218 ipstat.ips_rawout++; 219 } 220 return (ip_output(m, inp->inp_options, &inp->inp_route, flags, 221 inp->inp_moptions)); 222} 223 224/* 225 * Raw IP socket option processing. 226 */ 227int 228rip_ctloutput(so, sopt) 229 struct socket *so; 230 struct sockopt *sopt; 231{ 232 struct inpcb *inp = sotoinpcb(so); 233 int error, optval; 234 235 if (sopt->sopt_level != IPPROTO_IP) 236 return (EINVAL); 237 238 error = 0; 239 240 switch (sopt->sopt_dir) { 241 case SOPT_GET: 242 switch (sopt->sopt_name) { 243 case IP_HDRINCL: 244 optval = inp->inp_flags & INP_HDRINCL; 245 error = sooptcopyout(sopt, &optval, sizeof optval); 246 break; 247 248#ifdef COMPAT_IPFW 249 case IP_FW_GET: 250 if (ip_fw_ctl_ptr == 0) 251 error = ENOPROTOOPT; 252 else 253 error = ip_fw_ctl_ptr(sopt); 254 break; 255 256 case IP_NAT: 257 if (ip_nat_ctl_ptr == 0) 258 error = ENOPROTOOPT; 259 else 260 error = ip_nat_ctl_ptr(sopt); 261 break; 262#endif /* COMPAT_IPFW */ 263 264 case MRT_INIT: 265 case MRT_DONE: 266 case MRT_ADD_VIF: 267 case MRT_DEL_VIF: 268 case MRT_ADD_MFC: 269 case MRT_DEL_MFC: 270 case MRT_VERSION: 271 case MRT_ASSERT: 272 error = ip_mrouter_get(so, sopt); 273 break; 274 275 default: 276 error = ip_ctloutput(so, sopt); 277 break; 278 } 279 break; 280 281 case SOPT_SET: 282 switch (sopt->sopt_name) { 283 case IP_HDRINCL: 284 error = sooptcopyin(sopt, &optval, sizeof optval, 285 sizeof optval); 286 if (error) 287 break; 288 if (optval) 289 inp->inp_flags |= INP_HDRINCL; 290 else 291 inp->inp_flags &= ~INP_HDRINCL; 292 break; 293 294#ifdef COMPAT_IPFW 295 case IP_FW_ADD: 296 case IP_FW_DEL: 297 case IP_FW_FLUSH: 298 case IP_FW_ZERO: 299 if (ip_fw_ctl_ptr == 0) 300 error = ENOPROTOOPT; 301 else 302 error = ip_fw_ctl_ptr(sopt); 303 break; 304 305 case IP_NAT: 306 if (ip_nat_ctl_ptr == 0) 307 error = ENOPROTOOPT; 308 else 309 error = ip_nat_ctl_ptr(sopt); 310 break; 311#endif /* COMPAT_IPFW */ 312 313 case IP_RSVP_ON: 314 error = ip_rsvp_init(so); 315 break; 316 317 case IP_RSVP_OFF: 318 error = ip_rsvp_done(); 319 break; 320 321 /* XXX - should be combined */ 322 case IP_RSVP_VIF_ON: 323 error = ip_rsvp_vif_init(so, sopt); 324 break; 325 326 case IP_RSVP_VIF_OFF: 327 error = ip_rsvp_vif_done(so, sopt); 328 break; 329 330 case MRT_INIT: 331 case MRT_DONE: 332 case MRT_ADD_VIF: 333 case MRT_DEL_VIF: 334 case MRT_ADD_MFC: 335 case MRT_DEL_MFC: 336 case MRT_VERSION: 337 case MRT_ASSERT: 338 error = ip_mrouter_set(so, sopt); 339 break; 340 341 default: 342 error = ip_ctloutput(so, sopt); 343 break; 344 } 345 break; 346 } 347 348 return (error); 349} 350 351/* 352 * This function exists solely to receive the PRC_IFDOWN messages which 353 * are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, 354 * and calls in_ifadown() to remove all routes corresponding to that address. 355 * It also receives the PRC_IFUP messages from if_up() and reinstalls the 356 * interface routes. 357 */ 358void 359rip_ctlinput(cmd, sa, vip) 360 int cmd; 361 struct sockaddr *sa; 362 void *vip; 363{ 364 struct in_ifaddr *ia; 365 struct ifnet *ifp; 366 int err; 367 int flags; 368 369 switch (cmd) { 370 case PRC_IFDOWN: 371 for (ia = in_ifaddrhead.tqh_first; ia; 372 ia = ia->ia_link.tqe_next) { 373 if (ia->ia_ifa.ifa_addr == sa 374 && (ia->ia_flags & IFA_ROUTE)) { 375 /* 376 * in_ifscrub kills the interface route. 377 */ 378 in_ifscrub(ia->ia_ifp, ia); 379 /* 380 * in_ifadown gets rid of all the rest of 381 * the routes. This is not quite the right 382 * thing to do, but at least if we are running 383 * a routing process they will come back. 384 */ 385 in_ifadown(&ia->ia_ifa); 386 break; 387 } 388 } 389 break; 390 391 case PRC_IFUP: 392 for (ia = in_ifaddrhead.tqh_first; ia; 393 ia = ia->ia_link.tqe_next) { 394 if (ia->ia_ifa.ifa_addr == sa) 395 break; 396 } 397 if (ia == 0 || (ia->ia_flags & IFA_ROUTE)) 398 return; 399 flags = RTF_UP; 400 ifp = ia->ia_ifa.ifa_ifp; 401 402 if ((ifp->if_flags & IFF_LOOPBACK) 403 || (ifp->if_flags & IFF_POINTOPOINT)) 404 flags |= RTF_HOST; 405 406 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 407 if (err == 0) 408 ia->ia_flags |= IFA_ROUTE; 409 break; 410 } 411} 412 413static u_long rip_sendspace = RIPSNDQ; 414static u_long rip_recvspace = RIPRCVQ; 415 416SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, &rip_sendspace, 417 0, ""); 418SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, &rip_recvspace, 419 0, ""); 420 421static int 422rip_attach(struct socket *so, int proto, struct proc *p) 423{ 424 struct inpcb *inp; 425 int error, s; 426 427 inp = sotoinpcb(so); 428 if (inp) 429 panic("rip_attach"); 430 if (p && (error = suser(p->p_ucred, &p->p_acflag)) != 0) 431 return error; 432 433 s = splnet(); 434 error = in_pcballoc(so, &ripcbinfo, p); 435 splx(s); 436 if (error) 437 return error; 438 error = soreserve(so, rip_sendspace, rip_recvspace); 439 if (error) 440 return error; 441 inp = (struct inpcb *)so->so_pcb; 442 inp->inp_ip_p = proto; 443 return 0; 444} 445 446static int 447rip_detach(struct socket *so) 448{ 449 struct inpcb *inp; 450 451 inp = sotoinpcb(so); 452 if (inp == 0) 453 panic("rip_detach"); 454 if (so == ip_mrouter) 455 ip_mrouter_done(); 456 ip_rsvp_force_done(so); 457 if (so == ip_rsvpd) 458 ip_rsvp_done(); 459 in_pcbdetach(inp); 460 return 0; 461} 462 463static int 464rip_abort(struct socket *so) 465{ 466 soisdisconnected(so); 467 return rip_detach(so); 468} 469 470static int 471rip_disconnect(struct socket *so) 472{ 473 if ((so->so_state & SS_ISCONNECTED) == 0) 474 return ENOTCONN; 475 return rip_abort(so); 476} 477 478static int 479rip_bind(struct socket *so, struct sockaddr *nam, struct proc *p) 480{ 481 struct inpcb *inp = sotoinpcb(so); 482 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 483 484 if (nam->sa_len != sizeof(*addr)) 485 return EINVAL; 486 487 if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) && 488 (addr->sin_family != AF_IMPLINK)) || 489 (addr->sin_addr.s_addr && 490 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) 491 return EADDRNOTAVAIL; 492 inp->inp_laddr = addr->sin_addr; 493 return 0; 494} 495 496static int 497rip_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 498{ 499 struct inpcb *inp = sotoinpcb(so); 500 struct sockaddr_in *addr = (struct sockaddr_in *)nam; 501 502 if (nam->sa_len != sizeof(*addr)) 503 return EINVAL; 504 if (TAILQ_EMPTY(&ifnet)) 505 return EADDRNOTAVAIL; 506 if ((addr->sin_family != AF_INET) && 507 (addr->sin_family != AF_IMPLINK)) 508 return EAFNOSUPPORT; 509 inp->inp_faddr = addr->sin_addr; 510 soisconnected(so); 511 return 0; 512} 513 514static int 515rip_shutdown(struct socket *so) 516{ 517 socantsendmore(so); 518 return 0; 519} 520 521static int 522rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 523 struct mbuf *control, struct proc *p) 524{ 525 struct inpcb *inp = sotoinpcb(so); 526 register u_long dst; 527 528 if (so->so_state & SS_ISCONNECTED) { 529 if (nam) { 530 m_freem(m); 531 return EISCONN; 532 } 533 dst = inp->inp_faddr.s_addr; 534 } else { 535 if (nam == NULL) { 536 m_freem(m); 537 return ENOTCONN; 538 } 539 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr; 540 } 541 return rip_output(m, so, dst); 542} 543 544static int 545rip_pcblist SYSCTL_HANDLER_ARGS 546{ 547 int error, i, n, s; 548 struct inpcb *inp, **inp_list; 549 inp_gen_t gencnt; 550 struct xinpgen xig; 551 552 /* 553 * The process of preparing the TCB list is too time-consuming and 554 * resource-intensive to repeat twice on every request. 555 */ 556 if (req->oldptr == 0) { 557 n = ripcbinfo.ipi_count; 558 req->oldidx = 2 * (sizeof xig) 559 + (n + n/8) * sizeof(struct xinpcb); 560 return 0; 561 } 562 563 if (req->newptr != 0) 564 return EPERM; 565 566 /* 567 * OK, now we're committed to doing something. 568 */ 569 s = splnet(); 570 gencnt = ripcbinfo.ipi_gencnt; 571 n = ripcbinfo.ipi_count; 572 splx(s); 573 574 xig.xig_len = sizeof xig; 575 xig.xig_count = n; 576 xig.xig_gen = gencnt; 577 xig.xig_sogen = so_gencnt; 578 error = SYSCTL_OUT(req, &xig, sizeof xig); 579 if (error) 580 return error; 581 582 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 583 if (inp_list == 0) 584 return ENOMEM; 585 586 s = splnet(); 587 for (inp = ripcbinfo.listhead->lh_first, i = 0; inp && i < n; 588 inp = inp->inp_list.le_next) { 589 if (inp->inp_gencnt <= gencnt) 590 inp_list[i++] = inp; 591 } 592 splx(s); 593 n = i; 594 595 error = 0; 596 for (i = 0; i < n; i++) { 597 inp = inp_list[i]; 598 if (inp->inp_gencnt <= gencnt) { 599 struct xinpcb xi; 600 xi.xi_len = sizeof xi; 601 /* XXX should avoid extra copy */ 602 bcopy(inp, &xi.xi_inp, sizeof *inp); 603 if (inp->inp_socket) 604 sotoxsocket(inp->inp_socket, &xi.xi_socket); 605 error = SYSCTL_OUT(req, &xi, sizeof xi); 606 } 607 } 608 if (!error) { 609 /* 610 * Give the user an updated idea of our state. 611 * If the generation differs from what we told 612 * her before, she knows that something happened 613 * while we were processing this request, and it 614 * might be necessary to retry. 615 */ 616 s = splnet(); 617 xig.xig_gen = ripcbinfo.ipi_gencnt; 618 xig.xig_sogen = so_gencnt; 619 xig.xig_count = ripcbinfo.ipi_count; 620 splx(s); 621 error = SYSCTL_OUT(req, &xig, sizeof xig); 622 } 623 free(inp_list, M_TEMP); 624 return error; 625} 626 627SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0, 628 rip_pcblist, "S,xinpcb", "List of active raw IP sockets"); 629 630struct pr_usrreqs rip_usrreqs = { 631 rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect, 632 pru_connect2_notsupp, in_control, rip_detach, rip_disconnect, 633 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp, 634 pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown, 635 in_setsockaddr, sosend, soreceive, sopoll 636}; 637