1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * 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. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /*- 31 * Copyright (c) 1982, 1986, 1988, 1993 32 * The Regents of the University of California. 33 * All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 4. Neither the name of the University nor the names of its contributors 44 * may be used to endorse or promote products derived from this software 45 * without specific prior written permission. 46 * 47 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 48 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 50 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 51 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 52 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 53 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 54 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 55 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 56 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 57 * SUCH DAMAGE. 58 * 59 * @(#)raw_ip.c 8.2 (Berkeley) 1/4/94 60 */ 61 62 #include <sys/cdefs.h> 63 __FBSDID("$FreeBSD$"); 64 65 #include "opt_ipsec.h" 66 #include "opt_inet6.h" 67 68 #include <sys/param.h> 69 #include <sys/errno.h> 70 #include <sys/jail.h> 71 #include <sys/kernel.h> 72 #include <sys/lock.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/priv.h> 76 #include <sys/proc.h> 77 #include <sys/protosw.h> 78 #include <sys/signalvar.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/sx.h> 82 #include <sys/syslog.h> 83 84 #include <net/if.h> 85 #include <net/if_var.h> 86 #include <net/if_types.h> 87 #include <net/route.h> 88 #include <net/vnet.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <netinet/in_systm.h> 93 #include <netinet/in_pcb.h> 94 95 #include <netinet/icmp6.h> 96 #include <netinet/ip6.h> 97 #include <netinet/ip_var.h> 98 #include <netinet6/ip6protosw.h> 99 #include <netinet6/ip6_mroute.h> 100 #include <netinet6/in6_pcb.h> 101 #include <netinet6/ip6_var.h> 102 #include <netinet6/nd6.h> 103 #include <netinet6/raw_ip6.h> 104 #include <netinet6/scope6_var.h> 105 #include <netinet6/send.h> 106 107 #ifdef IPSEC 108 #include <netipsec/ipsec.h> 109 #include <netipsec/ipsec6.h> 110 #endif /* IPSEC */ 111 112 #include <machine/stdarg.h> 113 114 #define satosin6(sa) ((struct sockaddr_in6 *)(sa)) 115 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 116 117 /* 118 * Raw interface to IP6 protocol. 119 */ 120 121 VNET_DECLARE(struct inpcbhead, ripcb); 122 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 123 #define V_ripcb VNET(ripcb) 124 #define V_ripcbinfo VNET(ripcbinfo) 125 126 extern u_long rip_sendspace; 127 extern u_long rip_recvspace; 128 129 VNET_PCPUSTAT_DEFINE(struct rip6stat, rip6stat); 130 VNET_PCPUSTAT_SYSINIT(rip6stat); 131 132 #ifdef VIMAGE 133 VNET_PCPUSTAT_SYSUNINIT(rip6stat); 134 #endif /* VIMAGE */ 135 136 /* 137 * Hooks for multicast routing. They all default to NULL, so leave them not 138 * initialized and rely on BSS being set to 0. 139 */ 140 141 /* 142 * The socket used to communicate with the multicast routing daemon. 143 */ 144 VNET_DEFINE(struct socket *, ip6_mrouter); 145 146 /* 147 * The various mrouter functions. 148 */ 149 int (*ip6_mrouter_set)(struct socket *, struct sockopt *); 150 int (*ip6_mrouter_get)(struct socket *, struct sockopt *); 151 int (*ip6_mrouter_done)(void); 152 int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *); 153 int (*mrt6_ioctl)(u_long, caddr_t); 154 155 /* 156 * Setup generic address and protocol structures for raw_input routine, then 157 * pass them along with mbuf chain. 158 */ 159 int 160 rip6_input(struct mbuf **mp, int *offp, int proto) 161 { 162 struct ifnet *ifp; 163 struct mbuf *m = *mp; 164 register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 165 register struct inpcb *in6p; 166 struct inpcb *last = 0; 167 struct mbuf *opts = NULL; 168 struct sockaddr_in6 fromsa; 169 170 RIP6STAT_INC(rip6s_ipackets); 171 172 init_sin6(&fromsa, m); /* general init */ 173 174 ifp = m->m_pkthdr.rcvif; 175 176 INP_INFO_RLOCK(&V_ripcbinfo); 177 LIST_FOREACH(in6p, &V_ripcb, inp_list) { 178 /* XXX inp locking */ 179 if ((in6p->inp_vflag & INP_IPV6) == 0) 180 continue; 181 if (in6p->inp_ip_p && 182 in6p->inp_ip_p != proto) 183 continue; 184 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 185 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 186 continue; 187 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 188 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 189 continue; 190 if (jailed_without_vnet(in6p->inp_cred)) { 191 /* 192 * Allow raw socket in jail to receive multicast; 193 * assume process had PRIV_NETINET_RAW at attach, 194 * and fall through into normal filter path if so. 195 */ 196 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 197 prison_check_ip6(in6p->inp_cred, 198 &ip6->ip6_dst) != 0) 199 continue; 200 } 201 INP_RLOCK(in6p); 202 if (in6p->in6p_cksum != -1) { 203 RIP6STAT_INC(rip6s_isum); 204 if (in6_cksum(m, proto, *offp, 205 m->m_pkthdr.len - *offp)) { 206 INP_RUNLOCK(in6p); 207 RIP6STAT_INC(rip6s_badsum); 208 continue; 209 } 210 } 211 /* 212 * If this raw socket has multicast state, and we 213 * have received a multicast, check if this socket 214 * should receive it, as multicast filtering is now 215 * the responsibility of the transport layer. 216 */ 217 if (in6p->in6p_moptions && 218 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 219 /* 220 * If the incoming datagram is for MLD, allow it 221 * through unconditionally to the raw socket. 222 * 223 * Use the M_RTALERT_MLD flag to check for MLD 224 * traffic without having to inspect the mbuf chain 225 * more deeply, as all MLDv1/v2 host messages MUST 226 * contain the Router Alert option. 227 * 228 * In the case of MLDv1, we may not have explicitly 229 * joined the group, and may have set IFF_ALLMULTI 230 * on the interface. im6o_mc_filter() may discard 231 * control traffic we actually need to see. 232 * 233 * Userland multicast routing daemons should continue 234 * filter the control traffic appropriately. 235 */ 236 int blocked; 237 238 blocked = MCAST_PASS; 239 if ((m->m_flags & M_RTALERT_MLD) == 0) { 240 struct sockaddr_in6 mcaddr; 241 242 bzero(&mcaddr, sizeof(struct sockaddr_in6)); 243 mcaddr.sin6_len = sizeof(struct sockaddr_in6); 244 mcaddr.sin6_family = AF_INET6; 245 mcaddr.sin6_addr = ip6->ip6_dst; 246 247 blocked = im6o_mc_filter(in6p->in6p_moptions, 248 ifp, 249 (struct sockaddr *)&mcaddr, 250 (struct sockaddr *)&fromsa); 251 } 252 if (blocked != MCAST_PASS) { 253 IP6STAT_INC(ip6s_notmember); 254 INP_RUNLOCK(in6p); 255 continue; 256 } 257 } 258 if (last != NULL) { 259 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 260 261 #ifdef IPSEC 262 /* 263 * Check AH/ESP integrity. 264 */ 265 if (n && ipsec6_in_reject(n, last)) { 266 m_freem(n); 267 /* Do not inject data into pcb. */ 268 } else 269 #endif /* IPSEC */ 270 if (n) { 271 if (last->inp_flags & INP_CONTROLOPTS || 272 last->inp_socket->so_options & SO_TIMESTAMP) 273 ip6_savecontrol(last, n, &opts); 274 /* strip intermediate headers */ 275 m_adj(n, *offp); 276 if (sbappendaddr(&last->inp_socket->so_rcv, 277 (struct sockaddr *)&fromsa, 278 n, opts) == 0) { 279 m_freem(n); 280 if (opts) 281 m_freem(opts); 282 RIP6STAT_INC(rip6s_fullsock); 283 } else 284 sorwakeup(last->inp_socket); 285 opts = NULL; 286 } 287 INP_RUNLOCK(last); 288 } 289 last = in6p; 290 } 291 INP_INFO_RUNLOCK(&V_ripcbinfo); 292 #ifdef IPSEC 293 /* 294 * Check AH/ESP integrity. 295 */ 296 if ((last != NULL) && ipsec6_in_reject(m, last)) { 297 m_freem(m); 298 IP6STAT_DEC(ip6s_delivered); 299 /* Do not inject data into pcb. */ 300 INP_RUNLOCK(last); 301 } else 302 #endif /* IPSEC */ 303 if (last != NULL) { 304 if (last->inp_flags & INP_CONTROLOPTS || 305 last->inp_socket->so_options & SO_TIMESTAMP) 306 ip6_savecontrol(last, m, &opts); 307 /* Strip intermediate headers. */ 308 m_adj(m, *offp); 309 if (sbappendaddr(&last->inp_socket->so_rcv, 310 (struct sockaddr *)&fromsa, m, opts) == 0) { 311 m_freem(m); 312 if (opts) 313 m_freem(opts); 314 RIP6STAT_INC(rip6s_fullsock); 315 } else 316 sorwakeup(last->inp_socket); 317 INP_RUNLOCK(last); 318 } else { 319 RIP6STAT_INC(rip6s_nosock); 320 if (m->m_flags & M_MCAST) 321 RIP6STAT_INC(rip6s_nosockmcast); 322 if (proto == IPPROTO_NONE) 323 m_freem(m); 324 else { 325 char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */ 326 icmp6_error(m, ICMP6_PARAM_PROB, 327 ICMP6_PARAMPROB_NEXTHEADER, 328 prvnxtp - mtod(m, char *)); 329 } 330 IP6STAT_DEC(ip6s_delivered); 331 } 332 return (IPPROTO_DONE); 333 } 334 335 void 336 rip6_ctlinput(int cmd, struct sockaddr *sa, void *d) 337 { 338 struct ip6_hdr *ip6; 339 struct mbuf *m; 340 int off = 0; 341 struct ip6ctlparam *ip6cp = NULL; 342 const struct sockaddr_in6 *sa6_src = NULL; 343 void *cmdarg; 344 struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange; 345 346 if (sa->sa_family != AF_INET6 || 347 sa->sa_len != sizeof(struct sockaddr_in6)) 348 return; 349 350 if ((unsigned)cmd >= PRC_NCMDS) 351 return; 352 if (PRC_IS_REDIRECT(cmd)) 353 notify = in6_rtchange, d = NULL; 354 else if (cmd == PRC_HOSTDEAD) 355 d = NULL; 356 else if (inet6ctlerrmap[cmd] == 0) 357 return; 358 359 /* 360 * If the parameter is from icmp6, decode it. 361 */ 362 if (d != NULL) { 363 ip6cp = (struct ip6ctlparam *)d; 364 m = ip6cp->ip6c_m; 365 ip6 = ip6cp->ip6c_ip6; 366 off = ip6cp->ip6c_off; 367 cmdarg = ip6cp->ip6c_cmdarg; 368 sa6_src = ip6cp->ip6c_src; 369 } else { 370 m = NULL; 371 ip6 = NULL; 372 cmdarg = NULL; 373 sa6_src = &sa6_any; 374 } 375 376 (void) in6_pcbnotify(&V_ripcbinfo, sa, 0, 377 (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); 378 } 379 380 /* 381 * Generate IPv6 header and pass packet to ip6_output. Tack on options user 382 * may have setup with control call. 383 */ 384 int 385 rip6_output(struct mbuf *m, struct socket *so, ...) 386 { 387 struct mbuf *control; 388 struct m_tag *mtag; 389 struct sockaddr_in6 *dstsock; 390 struct in6_addr *dst; 391 struct ip6_hdr *ip6; 392 struct inpcb *in6p; 393 u_int plen = m->m_pkthdr.len; 394 int error = 0; 395 struct ip6_pktopts opt, *optp; 396 struct ifnet *oifp = NULL; 397 int type = 0, code = 0; /* for ICMPv6 output statistics only */ 398 int scope_ambiguous = 0; 399 int use_defzone = 0; 400 int hlim = 0; 401 struct in6_addr in6a; 402 va_list ap; 403 404 va_start(ap, so); 405 dstsock = va_arg(ap, struct sockaddr_in6 *); 406 control = va_arg(ap, struct mbuf *); 407 va_end(ap); 408 409 in6p = sotoinpcb(so); 410 INP_WLOCK(in6p); 411 412 dst = &dstsock->sin6_addr; 413 if (control != NULL) { 414 if ((error = ip6_setpktopts(control, &opt, 415 in6p->in6p_outputopts, so->so_cred, 416 so->so_proto->pr_protocol)) != 0) { 417 goto bad; 418 } 419 optp = &opt; 420 } else 421 optp = in6p->in6p_outputopts; 422 423 /* 424 * Check and convert scope zone ID into internal form. 425 * 426 * XXX: we may still need to determine the zone later. 427 */ 428 if (!(so->so_state & SS_ISCONNECTED)) { 429 if (!optp || !optp->ip6po_pktinfo || 430 !optp->ip6po_pktinfo->ipi6_ifindex) 431 use_defzone = V_ip6_use_defzone; 432 if (dstsock->sin6_scope_id == 0 && !use_defzone) 433 scope_ambiguous = 1; 434 if ((error = sa6_embedscope(dstsock, use_defzone)) != 0) 435 goto bad; 436 } 437 438 /* 439 * For an ICMPv6 packet, we should know its type and code to update 440 * statistics. 441 */ 442 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 443 struct icmp6_hdr *icmp6; 444 if (m->m_len < sizeof(struct icmp6_hdr) && 445 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) { 446 error = ENOBUFS; 447 goto bad; 448 } 449 icmp6 = mtod(m, struct icmp6_hdr *); 450 type = icmp6->icmp6_type; 451 code = icmp6->icmp6_code; 452 } 453 454 M_PREPEND(m, sizeof(*ip6), M_NOWAIT); 455 if (m == NULL) { 456 error = ENOBUFS; 457 goto bad; 458 } 459 ip6 = mtod(m, struct ip6_hdr *); 460 461 /* 462 * Source address selection. 463 */ 464 error = in6_selectsrc_socket(dstsock, optp, in6p, so->so_cred, 465 scope_ambiguous, &in6a, &hlim); 466 467 if (error) 468 goto bad; 469 error = prison_check_ip6(in6p->inp_cred, &in6a); 470 if (error != 0) 471 goto bad; 472 ip6->ip6_src = in6a; 473 474 ip6->ip6_dst = dstsock->sin6_addr; 475 476 /* 477 * Fill in the rest of the IPv6 header fields. 478 */ 479 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) | 480 (in6p->inp_flow & IPV6_FLOWINFO_MASK); 481 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) | 482 (IPV6_VERSION & IPV6_VERSION_MASK); 483 484 /* 485 * ip6_plen will be filled in ip6_output, so not fill it here. 486 */ 487 ip6->ip6_nxt = in6p->inp_ip_p; 488 ip6->ip6_hlim = hlim; 489 490 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 || 491 in6p->in6p_cksum != -1) { 492 struct mbuf *n; 493 int off; 494 u_int16_t *p; 495 496 /* Compute checksum. */ 497 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 498 off = offsetof(struct icmp6_hdr, icmp6_cksum); 499 else 500 off = in6p->in6p_cksum; 501 if (plen < off + 1) { 502 error = EINVAL; 503 goto bad; 504 } 505 off += sizeof(struct ip6_hdr); 506 507 n = m; 508 while (n && n->m_len <= off) { 509 off -= n->m_len; 510 n = n->m_next; 511 } 512 if (!n) 513 goto bad; 514 p = (u_int16_t *)(mtod(n, caddr_t) + off); 515 *p = 0; 516 *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen); 517 } 518 519 /* 520 * Send RA/RS messages to user land for protection, before sending 521 * them to rtadvd/rtsol. 522 */ 523 if ((send_sendso_input_hook != NULL) && 524 so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 525 switch (type) { 526 case ND_ROUTER_ADVERT: 527 case ND_ROUTER_SOLICIT: 528 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, 529 sizeof(unsigned short), M_NOWAIT); 530 if (mtag == NULL) 531 goto bad; 532 m_tag_prepend(m, mtag); 533 } 534 } 535 536 error = ip6_output(m, optp, NULL, 0, in6p->in6p_moptions, &oifp, in6p); 537 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 538 if (oifp) 539 icmp6_ifoutstat_inc(oifp, type, code); 540 ICMP6STAT_INC(icp6s_outhist[type]); 541 } else 542 RIP6STAT_INC(rip6s_opackets); 543 544 goto freectl; 545 546 bad: 547 if (m) 548 m_freem(m); 549 550 freectl: 551 if (control != NULL) { 552 ip6_clearpktopts(&opt, -1); 553 m_freem(control); 554 } 555 INP_WUNLOCK(in6p); 556 return (error); 557 } 558 559 /* 560 * Raw IPv6 socket option processing. 561 */ 562 int 563 rip6_ctloutput(struct socket *so, struct sockopt *sopt) 564 { 565 struct inpcb *inp; 566 int error; 567 568 if (sopt->sopt_level == IPPROTO_ICMPV6) 569 /* 570 * XXX: is it better to call icmp6_ctloutput() directly 571 * from protosw? 572 */ 573 return (icmp6_ctloutput(so, sopt)); 574 else if (sopt->sopt_level != IPPROTO_IPV6) { 575 if (sopt->sopt_level == SOL_SOCKET && 576 sopt->sopt_name == SO_SETFIB) { 577 inp = sotoinpcb(so); 578 INP_WLOCK(inp); 579 inp->inp_inc.inc_fibnum = so->so_fibnum; 580 INP_WUNLOCK(inp); 581 return (0); 582 } 583 return (EINVAL); 584 } 585 586 error = 0; 587 588 switch (sopt->sopt_dir) { 589 case SOPT_GET: 590 switch (sopt->sopt_name) { 591 case MRT6_INIT: 592 case MRT6_DONE: 593 case MRT6_ADD_MIF: 594 case MRT6_DEL_MIF: 595 case MRT6_ADD_MFC: 596 case MRT6_DEL_MFC: 597 case MRT6_PIM: 598 error = ip6_mrouter_get ? ip6_mrouter_get(so, sopt) : 599 EOPNOTSUPP; 600 break; 601 case IPV6_CHECKSUM: 602 error = ip6_raw_ctloutput(so, sopt); 603 break; 604 default: 605 error = ip6_ctloutput(so, sopt); 606 break; 607 } 608 break; 609 610 case SOPT_SET: 611 switch (sopt->sopt_name) { 612 case MRT6_INIT: 613 case MRT6_DONE: 614 case MRT6_ADD_MIF: 615 case MRT6_DEL_MIF: 616 case MRT6_ADD_MFC: 617 case MRT6_DEL_MFC: 618 case MRT6_PIM: 619 error = ip6_mrouter_set ? ip6_mrouter_set(so, sopt) : 620 EOPNOTSUPP; 621 break; 622 case IPV6_CHECKSUM: 623 error = ip6_raw_ctloutput(so, sopt); 624 break; 625 default: 626 error = ip6_ctloutput(so, sopt); 627 break; 628 } 629 break; 630 } 631 632 return (error); 633 } 634 635 static int 636 rip6_attach(struct socket *so, int proto, struct thread *td) 637 { 638 struct inpcb *inp; 639 struct icmp6_filter *filter; 640 int error; 641 642 inp = sotoinpcb(so); 643 KASSERT(inp == NULL, ("rip6_attach: inp != NULL")); 644 645 error = priv_check(td, PRIV_NETINET_RAW); 646 if (error) 647 return (error); 648 error = soreserve(so, rip_sendspace, rip_recvspace); 649 if (error) 650 return (error); 651 filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT); 652 if (filter == NULL) 653 return (ENOMEM); 654 INP_INFO_WLOCK(&V_ripcbinfo); 655 error = in_pcballoc(so, &V_ripcbinfo); 656 if (error) { 657 INP_INFO_WUNLOCK(&V_ripcbinfo); 658 free(filter, M_PCB); 659 return (error); 660 } 661 inp = (struct inpcb *)so->so_pcb; 662 INP_INFO_WUNLOCK(&V_ripcbinfo); 663 inp->inp_vflag |= INP_IPV6; 664 inp->inp_ip_p = (long)proto; 665 inp->in6p_hops = -1; /* use kernel default */ 666 inp->in6p_cksum = -1; 667 inp->in6p_icmp6filt = filter; 668 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt); 669 INP_WUNLOCK(inp); 670 return (0); 671 } 672 673 static void 674 rip6_detach(struct socket *so) 675 { 676 struct inpcb *inp; 677 678 inp = sotoinpcb(so); 679 KASSERT(inp != NULL, ("rip6_detach: inp == NULL")); 680 681 if (so == V_ip6_mrouter && ip6_mrouter_done) 682 ip6_mrouter_done(); 683 /* xxx: RSVP */ 684 INP_INFO_WLOCK(&V_ripcbinfo); 685 INP_WLOCK(inp); 686 free(inp->in6p_icmp6filt, M_PCB); 687 in_pcbdetach(inp); 688 in_pcbfree(inp); 689 INP_INFO_WUNLOCK(&V_ripcbinfo); 690 } 691 692 /* XXXRW: This can't ever be called. */ 693 static void 694 rip6_abort(struct socket *so) 695 { 696 struct inpcb *inp; 697 698 inp = sotoinpcb(so); 699 KASSERT(inp != NULL, ("rip6_abort: inp == NULL")); 700 701 soisdisconnected(so); 702 } 703 704 static void 705 rip6_close(struct socket *so) 706 { 707 struct inpcb *inp; 708 709 inp = sotoinpcb(so); 710 KASSERT(inp != NULL, ("rip6_close: inp == NULL")); 711 712 soisdisconnected(so); 713 } 714 715 static int 716 rip6_disconnect(struct socket *so) 717 { 718 struct inpcb *inp; 719 720 inp = sotoinpcb(so); 721 KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL")); 722 723 if ((so->so_state & SS_ISCONNECTED) == 0) 724 return (ENOTCONN); 725 inp->in6p_faddr = in6addr_any; 726 rip6_abort(so); 727 return (0); 728 } 729 730 static int 731 rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 732 { 733 struct inpcb *inp; 734 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam; 735 struct ifaddr *ifa = NULL; 736 int error = 0; 737 738 inp = sotoinpcb(so); 739 KASSERT(inp != NULL, ("rip6_bind: inp == NULL")); 740 741 if (nam->sa_len != sizeof(*addr)) 742 return (EINVAL); 743 if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0) 744 return (error); 745 if (TAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6) 746 return (EADDRNOTAVAIL); 747 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0) 748 return (error); 749 750 if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) && 751 (ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) 752 return (EADDRNOTAVAIL); 753 if (ifa != NULL && 754 ((struct in6_ifaddr *)ifa)->ia6_flags & 755 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY| 756 IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) { 757 ifa_free(ifa); 758 return (EADDRNOTAVAIL); 759 } 760 if (ifa != NULL) 761 ifa_free(ifa); 762 INP_INFO_WLOCK(&V_ripcbinfo); 763 INP_WLOCK(inp); 764 inp->in6p_laddr = addr->sin6_addr; 765 INP_WUNLOCK(inp); 766 INP_INFO_WUNLOCK(&V_ripcbinfo); 767 return (0); 768 } 769 770 static int 771 rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 772 { 773 struct inpcb *inp; 774 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam; 775 struct in6_addr in6a; 776 int error = 0, scope_ambiguous = 0; 777 778 inp = sotoinpcb(so); 779 KASSERT(inp != NULL, ("rip6_connect: inp == NULL")); 780 781 if (nam->sa_len != sizeof(*addr)) 782 return (EINVAL); 783 if (TAILQ_EMPTY(&V_ifnet)) 784 return (EADDRNOTAVAIL); 785 if (addr->sin6_family != AF_INET6) 786 return (EAFNOSUPPORT); 787 788 /* 789 * Application should provide a proper zone ID or the use of default 790 * zone IDs should be enabled. Unfortunately, some applications do 791 * not behave as it should, so we need a workaround. Even if an 792 * appropriate ID is not determined, we'll see if we can determine 793 * the outgoing interface. If we can, determine the zone ID based on 794 * the interface below. 795 */ 796 if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone) 797 scope_ambiguous = 1; 798 if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0) 799 return (error); 800 801 INP_INFO_WLOCK(&V_ripcbinfo); 802 INP_WLOCK(inp); 803 /* Source address selection. XXX: need pcblookup? */ 804 error = in6_selectsrc_socket(addr, inp->in6p_outputopts, 805 inp, so->so_cred, scope_ambiguous, &in6a, NULL); 806 if (error) { 807 INP_WUNLOCK(inp); 808 INP_INFO_WUNLOCK(&V_ripcbinfo); 809 return (error); 810 } 811 812 inp->in6p_faddr = addr->sin6_addr; 813 inp->in6p_laddr = in6a; 814 soisconnected(so); 815 INP_WUNLOCK(inp); 816 INP_INFO_WUNLOCK(&V_ripcbinfo); 817 return (0); 818 } 819 820 static int 821 rip6_shutdown(struct socket *so) 822 { 823 struct inpcb *inp; 824 825 inp = sotoinpcb(so); 826 KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL")); 827 828 INP_WLOCK(inp); 829 socantsendmore(so); 830 INP_WUNLOCK(inp); 831 return (0); 832 } 833 834 static int 835 rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 836 struct mbuf *control, struct thread *td) 837 { 838 struct inpcb *inp; 839 struct sockaddr_in6 tmp; 840 struct sockaddr_in6 *dst; 841 int ret; 842 843 inp = sotoinpcb(so); 844 KASSERT(inp != NULL, ("rip6_send: inp == NULL")); 845 846 /* Always copy sockaddr to avoid overwrites. */ 847 /* Unlocked read. */ 848 if (so->so_state & SS_ISCONNECTED) { 849 if (nam) { 850 m_freem(m); 851 return (EISCONN); 852 } 853 /* XXX */ 854 bzero(&tmp, sizeof(tmp)); 855 tmp.sin6_family = AF_INET6; 856 tmp.sin6_len = sizeof(struct sockaddr_in6); 857 INP_RLOCK(inp); 858 bcopy(&inp->in6p_faddr, &tmp.sin6_addr, 859 sizeof(struct in6_addr)); 860 INP_RUNLOCK(inp); 861 dst = &tmp; 862 } else { 863 if (nam == NULL) { 864 m_freem(m); 865 return (ENOTCONN); 866 } 867 if (nam->sa_len != sizeof(struct sockaddr_in6)) { 868 m_freem(m); 869 return (EINVAL); 870 } 871 tmp = *(struct sockaddr_in6 *)nam; 872 dst = &tmp; 873 874 if (dst->sin6_family == AF_UNSPEC) { 875 /* 876 * XXX: we allow this case for backward 877 * compatibility to buggy applications that 878 * rely on old (and wrong) kernel behavior. 879 */ 880 log(LOG_INFO, "rip6 SEND: address family is " 881 "unspec. Assume AF_INET6\n"); 882 dst->sin6_family = AF_INET6; 883 } else if (dst->sin6_family != AF_INET6) { 884 m_freem(m); 885 return(EAFNOSUPPORT); 886 } 887 } 888 ret = rip6_output(m, so, dst, control); 889 return (ret); 890 } 891 892 struct pr_usrreqs rip6_usrreqs = { 893 .pru_abort = rip6_abort, 894 .pru_attach = rip6_attach, 895 .pru_bind = rip6_bind, 896 .pru_connect = rip6_connect, 897 .pru_control = in6_control, 898 .pru_detach = rip6_detach, 899 .pru_disconnect = rip6_disconnect, 900 .pru_peeraddr = in6_getpeeraddr, 901 .pru_send = rip6_send, 902 .pru_shutdown = rip6_shutdown, 903 .pru_sockaddr = in6_getsockaddr, 904 .pru_close = rip6_close, 905 }; 906