Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/net/rtsock.c
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1 /*- 2 * Copyright (c) 1988, 1991, 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 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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 * @(#)rtsock.c 8.7 (Berkeley) 10/12/95 30 * $FreeBSD$ 31 */ 32 #include "opt_sctp.h" 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 36 #include <sys/param.h> 37 #include <sys/domain.h> 38 #include <sys/jail.h> 39 #include <sys/kernel.h> 40 #include <sys/malloc.h> 41 #include <sys/mbuf.h> 42 #include <sys/priv.h> 43 #include <sys/proc.h> 44 #include <sys/protosw.h> 45 #include <sys/signalvar.h> 46 #include <sys/socket.h> 47 #include <sys/socketvar.h> 48 #include <sys/sysctl.h> 49 #include <sys/systm.h> 50 51 #include <net/if.h> 52 #include <net/netisr.h> 53 #include <net/raw_cb.h> 54 #include <net/route.h> 55 56 #include <netinet/in.h> 57 #ifdef INET6 58 #include <netinet6/scope6_var.h> 59 #endif 60 61 #ifdef SCTP 62 extern void sctp_addr_change(struct ifaddr *ifa, int cmd); 63 #endif /* SCTP */ 64 65 #ifdef COMPAT_FREEBSD32 66 #include <sys/mount.h> 67 #include <compat/freebsd32/freebsd32.h> 68 69 struct if_data32 { 70 uint8_t ifi_type; 71 uint8_t ifi_physical; 72 uint8_t ifi_addrlen; 73 uint8_t ifi_hdrlen; 74 uint8_t ifi_link_state; 75 uint8_t ifi_spare_char1; 76 uint8_t ifi_spare_char2; 77 uint8_t ifi_datalen; 78 uint32_t ifi_mtu; 79 uint32_t ifi_metric; 80 uint32_t ifi_baudrate; 81 uint32_t ifi_ipackets; 82 uint32_t ifi_ierrors; 83 uint32_t ifi_opackets; 84 uint32_t ifi_oerrors; 85 uint32_t ifi_collisions; 86 uint32_t ifi_ibytes; 87 uint32_t ifi_obytes; 88 uint32_t ifi_imcasts; 89 uint32_t ifi_omcasts; 90 uint32_t ifi_iqdrops; 91 uint32_t ifi_noproto; 92 uint32_t ifi_hwassist; 93 int32_t ifi_epoch; 94 struct timeval32 ifi_lastchange; 95 }; 96 97 struct if_msghdr32 { 98 uint16_t ifm_msglen; 99 uint8_t ifm_version; 100 uint8_t ifm_type; 101 int32_t ifm_addrs; 102 int32_t ifm_flags; 103 uint16_t ifm_index; 104 struct if_data32 ifm_data; 105 }; 106 107 struct if_msghdrl32 { 108 uint16_t ifm_msglen; 109 uint8_t ifm_version; 110 uint8_t ifm_type; 111 int32_t ifm_addrs; 112 int32_t ifm_flags; 113 uint16_t ifm_index; 114 uint16_t _ifm_spare1; 115 uint16_t ifm_len; 116 uint16_t ifm_data_off; 117 struct if_data32 ifm_data; 118 }; 119 120 struct ifa_msghdrl32 { 121 uint16_t ifam_msglen; 122 uint8_t ifam_version; 123 uint8_t ifam_type; 124 int32_t ifam_addrs; 125 int32_t ifam_flags; 126 uint16_t ifam_index; 127 uint16_t _ifam_spare1; 128 uint16_t ifam_len; 129 uint16_t ifam_data_off; 130 int32_t ifam_metric; 131 struct if_data32 ifam_data; 132 }; 133 #endif /* COMPAT_FREEBSD32 */ 134 135 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables"); 136 137 /* NB: these are not modified */ 138 static struct sockaddr route_src = { 2, PF_ROUTE, }; 139 static struct sockaddr sa_zero = { sizeof(sa_zero), AF_INET, }; 140 141 /* 142 * Used by rtsock/raw_input callback code to decide whether to filter the update 143 * notification to a socket bound to a particular FIB. 144 */ 145 #define RTS_FILTER_FIB M_PROTO8 146 #define RTS_ALLFIBS -1 147 148 static struct { 149 int ip_count; /* attached w/ AF_INET */ 150 int ip6_count; /* attached w/ AF_INET6 */ 151 int ipx_count; /* attached w/ AF_IPX */ 152 int any_count; /* total attached */ 153 } route_cb; 154 155 struct mtx rtsock_mtx; 156 MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF); 157 158 #define RTSOCK_LOCK() mtx_lock(&rtsock_mtx) 159 #define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx) 160 #define RTSOCK_LOCK_ASSERT() mtx_assert(&rtsock_mtx, MA_OWNED) 161 162 static struct ifqueue rtsintrq; 163 164 SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD, 0, ""); 165 SYSCTL_INT(_net_route, OID_AUTO, netisr_maxqlen, CTLFLAG_RW, 166 &rtsintrq.ifq_maxlen, 0, "maximum routing socket dispatch queue length"); 167 168 struct walkarg { 169 int w_tmemsize; 170 int w_op, w_arg; 171 caddr_t w_tmem; 172 struct sysctl_req *w_req; 173 }; 174 175 static void rts_input(struct mbuf *m); 176 static struct mbuf *rt_msg1(int type, struct rt_addrinfo *rtinfo); 177 static int rt_msg2(int type, struct rt_addrinfo *rtinfo, 178 caddr_t cp, struct walkarg *w); 179 static int rt_xaddrs(caddr_t cp, caddr_t cplim, 180 struct rt_addrinfo *rtinfo); 181 static int sysctl_dumpentry(struct radix_node *rn, void *vw); 182 static int sysctl_iflist(int af, struct walkarg *w); 183 static int sysctl_ifmalist(int af, struct walkarg *w); 184 static int route_output(struct mbuf *m, struct socket *so); 185 static void rt_setmetrics(u_long which, const struct rt_metrics *in, 186 struct rt_metrics_lite *out); 187 static void rt_getmetrics(const struct rt_metrics_lite *in, 188 struct rt_metrics *out); 189 static void rt_dispatch(struct mbuf *, const struct sockaddr *); 190 191 static void 192 rts_init(void) 193 { 194 int tmp; 195 196 rtsintrq.ifq_maxlen = 256; 197 if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp)) 198 rtsintrq.ifq_maxlen = tmp; 199 mtx_init(&rtsintrq.ifq_mtx, "rts_inq", NULL, MTX_DEF); 200 netisr_register(NETISR_ROUTE, rts_input, &rtsintrq, NETISR_MPSAFE); 201 } 202 SYSINIT(rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rts_init, 0); 203 204 static int 205 raw_input_rts_cb(struct mbuf *m, struct sockproto *proto, struct sockaddr *src, 206 struct rawcb *rp) 207 { 208 int fibnum; 209 210 KASSERT(m != NULL, ("%s: m is NULL", __func__)); 211 KASSERT(proto != NULL, ("%s: proto is NULL", __func__)); 212 KASSERT(rp != NULL, ("%s: rp is NULL", __func__)); 213 214 /* No filtering requested. */ 215 if ((m->m_flags & RTS_FILTER_FIB) == 0) 216 return (0); 217 218 /* Check if it is a rts and the fib matches the one of the socket. */ 219 fibnum = M_GETFIB(m); 220 if (proto->sp_family != PF_ROUTE || 221 rp->rcb_socket == NULL || 222 rp->rcb_socket->so_fibnum == fibnum) 223 return (0); 224 225 /* Filtering requested and no match, the socket shall be skipped. */ 226 return (1); 227 } 228 229 static void 230 rts_input(struct mbuf *m) 231 { 232 struct sockproto route_proto; 233 unsigned short *family; 234 struct m_tag *tag; 235 236 route_proto.sp_family = PF_ROUTE; 237 tag = m_tag_find(m, PACKET_TAG_RTSOCKFAM, NULL); 238 if (tag != NULL) { 239 family = (unsigned short *)(tag + 1); 240 route_proto.sp_protocol = *family; 241 m_tag_delete(m, tag); 242 } else 243 route_proto.sp_protocol = 0; 244 245 raw_input_ext(m, &route_proto, &route_src, raw_input_rts_cb); 246 } 247 248 /* 249 * It really doesn't make any sense at all for this code to share much 250 * with raw_usrreq.c, since its functionality is so restricted. XXX 251 */ 252 static void 253 rts_abort(struct socket *so) 254 { 255 256 raw_usrreqs.pru_abort(so); 257 } 258 259 static void 260 rts_close(struct socket *so) 261 { 262 263 raw_usrreqs.pru_close(so); 264 } 265 266 /* pru_accept is EOPNOTSUPP */ 267 268 static int 269 rts_attach(struct socket *so, int proto, struct thread *td) 270 { 271 struct rawcb *rp; 272 int s, error; 273 274 KASSERT(so->so_pcb == NULL, ("rts_attach: so_pcb != NULL")); 275 276 /* XXX */ 277 MALLOC(rp, struct rawcb *, sizeof *rp, M_PCB, M_WAITOK | M_ZERO); 278 if (rp == NULL) 279 return ENOBUFS; 280 281 /* 282 * The splnet() is necessary to block protocols from sending 283 * error notifications (like RTM_REDIRECT or RTM_LOSING) while 284 * this PCB is extant but incompletely initialized. 285 * Probably we should try to do more of this work beforehand and 286 * eliminate the spl. 287 */ 288 s = splnet(); 289 so->so_pcb = (caddr_t)rp; 290 so->so_fibnum = td->td_proc->p_fibnum; 291 error = raw_attach(so, proto); 292 rp = sotorawcb(so); 293 if (error) { 294 splx(s); 295 so->so_pcb = NULL; 296 free(rp, M_PCB); 297 return error; 298 } 299 RTSOCK_LOCK(); 300 switch(rp->rcb_proto.sp_protocol) { 301 case AF_INET: 302 route_cb.ip_count++; 303 break; 304 case AF_INET6: 305 route_cb.ip6_count++; 306 break; 307 case AF_IPX: 308 route_cb.ipx_count++; 309 break; 310 } 311 route_cb.any_count++; 312 RTSOCK_UNLOCK(); 313 soisconnected(so); 314 so->so_options |= SO_USELOOPBACK; 315 splx(s); 316 return 0; 317 } 318 319 static int 320 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 321 { 322 323 return (raw_usrreqs.pru_bind(so, nam, td)); /* xxx just EINVAL */ 324 } 325 326 static int 327 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 328 { 329 330 return (raw_usrreqs.pru_connect(so, nam, td)); /* XXX just EINVAL */ 331 } 332 333 /* pru_connect2 is EOPNOTSUPP */ 334 /* pru_control is EOPNOTSUPP */ 335 336 static void 337 rts_detach(struct socket *so) 338 { 339 struct rawcb *rp = sotorawcb(so); 340 341 KASSERT(rp != NULL, ("rts_detach: rp == NULL")); 342 343 RTSOCK_LOCK(); 344 switch(rp->rcb_proto.sp_protocol) { 345 case AF_INET: 346 route_cb.ip_count--; 347 break; 348 case AF_INET6: 349 route_cb.ip6_count--; 350 break; 351 case AF_IPX: 352 route_cb.ipx_count--; 353 break; 354 } 355 route_cb.any_count--; 356 RTSOCK_UNLOCK(); 357 raw_usrreqs.pru_detach(so); 358 } 359 360 static int 361 rts_disconnect(struct socket *so) 362 { 363 364 return (raw_usrreqs.pru_disconnect(so)); 365 } 366 367 /* pru_listen is EOPNOTSUPP */ 368 369 static int 370 rts_peeraddr(struct socket *so, struct sockaddr **nam) 371 { 372 373 return (raw_usrreqs.pru_peeraddr(so, nam)); 374 } 375 376 /* pru_rcvd is EOPNOTSUPP */ 377 /* pru_rcvoob is EOPNOTSUPP */ 378 379 static int 380 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 381 struct mbuf *control, struct thread *td) 382 { 383 384 return (raw_usrreqs.pru_send(so, flags, m, nam, control, td)); 385 } 386 387 /* pru_sense is null */ 388 389 static int 390 rts_shutdown(struct socket *so) 391 { 392 393 return (raw_usrreqs.pru_shutdown(so)); 394 } 395 396 static int 397 rts_sockaddr(struct socket *so, struct sockaddr **nam) 398 { 399 400 return (raw_usrreqs.pru_sockaddr(so, nam)); 401 } 402 403 static struct pr_usrreqs route_usrreqs = { 404 .pru_abort = rts_abort, 405 .pru_attach = rts_attach, 406 .pru_bind = rts_bind, 407 .pru_connect = rts_connect, 408 .pru_detach = rts_detach, 409 .pru_disconnect = rts_disconnect, 410 .pru_peeraddr = rts_peeraddr, 411 .pru_send = rts_send, 412 .pru_shutdown = rts_shutdown, 413 .pru_sockaddr = rts_sockaddr, 414 .pru_close = rts_close, 415 }; 416 417 #ifndef _SOCKADDR_UNION_DEFINED 418 #define _SOCKADDR_UNION_DEFINED 419 /* 420 * The union of all possible address formats we handle. 421 */ 422 union sockaddr_union { 423 struct sockaddr sa; 424 struct sockaddr_in sin; 425 struct sockaddr_in6 sin6; 426 }; 427 #endif /* _SOCKADDR_UNION_DEFINED */ 428 429 static int 430 rtm_get_jailed(struct rt_addrinfo *info, struct ifnet *ifp, 431 struct rtentry *rt, union sockaddr_union *saun, struct ucred *cred) 432 { 433 434 /* First, see if the returned address is part of the jail. */ 435 if (prison_if(cred, rt->rt_ifa->ifa_addr) == 0) { 436 info->rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 437 return (0); 438 } 439 440 switch (info->rti_info[RTAX_DST]->sa_family) { 441 #ifdef INET 442 case AF_INET: 443 { 444 struct in_addr ia; 445 struct ifaddr *ifa; 446 int found; 447 448 found = 0; 449 /* 450 * Try to find an address on the given outgoing interface 451 * that belongs to the jail. 452 */ 453 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 454 struct sockaddr *sa; 455 sa = ifa->ifa_addr; 456 if (sa->sa_family != AF_INET) 457 continue; 458 ia = ((struct sockaddr_in *)sa)->sin_addr; 459 if (prison_check_ip4(cred, &ia) == 0) { 460 found = 1; 461 break; 462 } 463 } 464 if (!found) { 465 /* 466 * As a last resort return the 'default' jail address. 467 */ 468 if (prison_get_ip4(cred, &ia) != 0) 469 return (ESRCH); 470 } 471 bzero(&saun->sin, sizeof(struct sockaddr_in)); 472 saun->sin.sin_len = sizeof(struct sockaddr_in); 473 saun->sin.sin_family = AF_INET; 474 saun->sin.sin_addr.s_addr = ia.s_addr; 475 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin; 476 break; 477 } 478 #endif 479 #ifdef INET6 480 case AF_INET6: 481 { 482 struct in6_addr ia6; 483 struct ifaddr *ifa; 484 int found; 485 486 found = 0; 487 /* 488 * Try to find an address on the given outgoing interface 489 * that belongs to the jail. 490 */ 491 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 492 struct sockaddr *sa; 493 sa = ifa->ifa_addr; 494 if (sa->sa_family != AF_INET6) 495 continue; 496 bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr, 497 &ia6, sizeof(struct in6_addr)); 498 if (prison_check_ip6(cred, &ia6) == 0) { 499 found = 1; 500 break; 501 } 502 } 503 if (!found) { 504 /* 505 * As a last resort return the 'default' jail address. 506 */ 507 if (prison_get_ip6(cred, &ia6) != 0) 508 return (ESRCH); 509 } 510 bzero(&saun->sin6, sizeof(struct sockaddr_in6)); 511 saun->sin6.sin6_len = sizeof(struct sockaddr_in6); 512 saun->sin6.sin6_family = AF_INET6; 513 bcopy(&ia6, &saun->sin6.sin6_addr, sizeof(struct in6_addr)); 514 if (sa6_recoverscope(&saun->sin6) != 0) 515 return (ESRCH); 516 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin6; 517 break; 518 } 519 #endif 520 default: 521 return (ESRCH); 522 } 523 return (0); 524 } 525 526 /*ARGSUSED*/ 527 static int 528 route_output(struct mbuf *m, struct socket *so) 529 { 530 #define sa_equal(a1, a2) (bcmp((a1), (a2), (a1)->sa_len) == 0) 531 struct rt_msghdr *rtm = NULL; 532 struct rtentry *rt = NULL; 533 struct radix_node_head *rnh; 534 struct rt_addrinfo info; 535 int len, error = 0; 536 struct ifnet *ifp = NULL; 537 union sockaddr_union saun; 538 539 #define senderr(e) { error = e; goto flush;} 540 if (m == NULL || ((m->m_len < sizeof(long)) && 541 (m = m_pullup(m, sizeof(long))) == NULL)) 542 return (ENOBUFS); 543 if ((m->m_flags & M_PKTHDR) == 0) 544 panic("route_output"); 545 len = m->m_pkthdr.len; 546 if (len < sizeof(*rtm) || 547 len != mtod(m, struct rt_msghdr *)->rtm_msglen) { 548 info.rti_info[RTAX_DST] = NULL; 549 senderr(EINVAL); 550 } 551 R_Malloc(rtm, struct rt_msghdr *, len); 552 if (rtm == NULL) { 553 info.rti_info[RTAX_DST] = NULL; 554 senderr(ENOBUFS); 555 } 556 m_copydata(m, 0, len, (caddr_t)rtm); 557 if (rtm->rtm_version != RTM_VERSION) { 558 info.rti_info[RTAX_DST] = NULL; 559 senderr(EPROTONOSUPPORT); 560 } 561 rtm->rtm_pid = curproc->p_pid; 562 bzero(&info, sizeof(info)); 563 info.rti_addrs = rtm->rtm_addrs; 564 if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info)) { 565 info.rti_info[RTAX_DST] = NULL; 566 senderr(EINVAL); 567 } 568 info.rti_flags = rtm->rtm_flags; 569 if (info.rti_info[RTAX_DST] == NULL || 570 info.rti_info[RTAX_DST]->sa_family >= AF_MAX || 571 (info.rti_info[RTAX_GATEWAY] != NULL && 572 info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX)) 573 senderr(EINVAL); 574 if (info.rti_info[RTAX_GENMASK]) { 575 struct radix_node *t; 576 t = rn_addmask((caddr_t) info.rti_info[RTAX_GENMASK], 0, 1); 577 if (t != NULL && 578 bcmp((char *)(void *)info.rti_info[RTAX_GENMASK] + 1, 579 (char *)(void *)t->rn_key + 1, 580 ((struct sockaddr *)t->rn_key)->sa_len - 1) == 0) 581 info.rti_info[RTAX_GENMASK] = 582 (struct sockaddr *)t->rn_key; 583 else 584 senderr(ENOBUFS); 585 } 586 587 /* 588 * Verify that the caller has the appropriate privilege; RTM_GET 589 * is the only operation the non-superuser is allowed. 590 */ 591 if (rtm->rtm_type != RTM_GET) { 592 error = priv_check(curthread, PRIV_NET_ROUTE); 593 if (error) 594 senderr(error); 595 } 596 597 switch (rtm->rtm_type) { 598 struct rtentry *saved_nrt; 599 600 case RTM_ADD: 601 if (info.rti_info[RTAX_GATEWAY] == NULL) 602 senderr(EINVAL); 603 saved_nrt = NULL; 604 error = rtrequest1_fib(RTM_ADD, &info, &saved_nrt, 605 so->so_fibnum); 606 if (error == 0 && saved_nrt) { 607 RT_LOCK(saved_nrt); 608 rt_setmetrics(rtm->rtm_inits, 609 &rtm->rtm_rmx, &saved_nrt->rt_rmx); 610 rtm->rtm_index = saved_nrt->rt_ifp->if_index; 611 RT_REMREF(saved_nrt); 612 saved_nrt->rt_genmask = info.rti_info[RTAX_GENMASK]; 613 RT_UNLOCK(saved_nrt); 614 } 615 break; 616 617 case RTM_DELETE: 618 saved_nrt = NULL; 619 error = rtrequest1_fib(RTM_DELETE, &info, &saved_nrt, 620 so->so_fibnum); 621 if (error == 0) { 622 RT_LOCK(saved_nrt); 623 rt = saved_nrt; 624 goto report; 625 } 626 break; 627 628 case RTM_GET: 629 case RTM_CHANGE: 630 case RTM_LOCK: 631 rnh = rt_tables[so->so_fibnum][info.rti_info[RTAX_DST]->sa_family]; 632 if (rnh == NULL) 633 senderr(EAFNOSUPPORT); 634 RADIX_NODE_HEAD_LOCK(rnh); 635 rt = (struct rtentry *) rnh->rnh_lookup(info.rti_info[RTAX_DST], 636 info.rti_info[RTAX_NETMASK], rnh); 637 if (rt == NULL) { /* XXX looks bogus */ 638 RADIX_NODE_HEAD_UNLOCK(rnh); 639 senderr(ESRCH); 640 } 641 RT_LOCK(rt); 642 RT_ADDREF(rt); 643 RADIX_NODE_HEAD_UNLOCK(rnh); 644 645 /* 646 * Fix for PR: 82974 647 * 648 * RTM_CHANGE/LOCK need a perfect match, rn_lookup() 649 * returns a perfect match in case a netmask is 650 * specified. For host routes only a longest prefix 651 * match is returned so it is necessary to compare the 652 * existence of the netmask. If both have a netmask 653 * rnh_lookup() did a perfect match and if none of them 654 * have a netmask both are host routes which is also a 655 * perfect match. 656 */ 657 658 if (rtm->rtm_type != RTM_GET && 659 (!rt_mask(rt) != !info.rti_info[RTAX_NETMASK])) { 660 RT_UNLOCK(rt); 661 senderr(ESRCH); 662 } 663 664 switch(rtm->rtm_type) { 665 666 case RTM_GET: 667 report: 668 RT_LOCK_ASSERT(rt); 669 if ((rt->rt_flags & RTF_HOST) == 0 670 ? jailed(curthread->td_ucred) 671 : prison_if(curthread->td_ucred, 672 rt_key(rt)) != 0) { 673 RT_UNLOCK(rt); 674 senderr(ESRCH); 675 } 676 info.rti_info[RTAX_DST] = rt_key(rt); 677 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 678 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 679 info.rti_info[RTAX_GENMASK] = rt->rt_genmask; 680 if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) { 681 ifp = rt->rt_ifp; 682 if (ifp) { 683 info.rti_info[RTAX_IFP] = 684 ifp->if_addr->ifa_addr; 685 error = rtm_get_jailed(&info, ifp, rt, 686 &saun, curthread->td_ucred); 687 if (error != 0) { 688 RT_UNLOCK(rt); 689 senderr(error); 690 } 691 if (ifp->if_flags & IFF_POINTOPOINT) 692 info.rti_info[RTAX_BRD] = 693 rt->rt_ifa->ifa_dstaddr; 694 rtm->rtm_index = ifp->if_index; 695 } else { 696 info.rti_info[RTAX_IFP] = NULL; 697 info.rti_info[RTAX_IFA] = NULL; 698 } 699 } else if ((ifp = rt->rt_ifp) != NULL) { 700 rtm->rtm_index = ifp->if_index; 701 } 702 len = rt_msg2(rtm->rtm_type, &info, NULL, NULL); 703 if (len > rtm->rtm_msglen) { 704 struct rt_msghdr *new_rtm; 705 R_Malloc(new_rtm, struct rt_msghdr *, len); 706 if (new_rtm == NULL) { 707 RT_UNLOCK(rt); 708 senderr(ENOBUFS); 709 } 710 bcopy(rtm, new_rtm, rtm->rtm_msglen); 711 Free(rtm); rtm = new_rtm; 712 } 713 (void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm, NULL); 714 rtm->rtm_flags = rt->rt_flags; 715 rtm->rtm_use = 0; 716 rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx); 717 rtm->rtm_addrs = info.rti_addrs; 718 break; 719 720 case RTM_CHANGE: 721 /* 722 * New gateway could require new ifaddr, ifp; 723 * flags may also be different; ifp may be specified 724 * by ll sockaddr when protocol address is ambiguous 725 */ 726 if (((rt->rt_flags & RTF_GATEWAY) && 727 info.rti_info[RTAX_GATEWAY] != NULL) || 728 info.rti_info[RTAX_IFP] != NULL || 729 (info.rti_info[RTAX_IFA] != NULL && 730 !sa_equal(info.rti_info[RTAX_IFA], 731 rt->rt_ifa->ifa_addr))) { 732 RT_UNLOCK(rt); 733 RADIX_NODE_HEAD_LOCK(rnh); 734 error = rt_getifa_fib(&info, rt->rt_fibnum); 735 RADIX_NODE_HEAD_UNLOCK(rnh); 736 if (error != 0) 737 senderr(error); 738 RT_LOCK(rt); 739 } 740 if (info.rti_ifa != NULL && 741 info.rti_ifa != rt->rt_ifa && 742 rt->rt_ifa != NULL && 743 rt->rt_ifa->ifa_rtrequest != NULL) { 744 rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt, 745 &info); 746 IFAFREE(rt->rt_ifa); 747 } 748 if (info.rti_info[RTAX_GATEWAY] != NULL) { 749 RT_UNLOCK(rt); 750 RADIX_NODE_HEAD_LOCK(rnh); 751 RT_LOCK(rt); 752 753 error = rt_setgate(rt, rt_key(rt), 754 info.rti_info[RTAX_GATEWAY]); 755 RADIX_NODE_HEAD_UNLOCK(rnh); 756 if (error != 0) { 757 RT_UNLOCK(rt); 758 senderr(error); 759 } 760 if (!(rt->rt_flags & RTF_LLINFO)) 761 rt->rt_flags |= RTF_GATEWAY; 762 } 763 if (info.rti_ifa != NULL && 764 info.rti_ifa != rt->rt_ifa) { 765 IFAREF(info.rti_ifa); 766 rt->rt_ifa = info.rti_ifa; 767 rt->rt_ifp = info.rti_ifp; 768 } 769 /* Allow some flags to be toggled on change. */ 770 if (rtm->rtm_fmask & RTF_FMASK) 771 rt->rt_flags = (rt->rt_flags & 772 ~rtm->rtm_fmask) | 773 (rtm->rtm_flags & rtm->rtm_fmask); 774 rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx, 775 &rt->rt_rmx); 776 rtm->rtm_index = rt->rt_ifp->if_index; 777 if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest) { 778 RT_UNLOCK(rt); 779 RADIX_NODE_HEAD_LOCK(rnh); 780 RT_LOCK(rt); 781 rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info); 782 RADIX_NODE_HEAD_UNLOCK(rnh); 783 } 784 if (info.rti_info[RTAX_GENMASK]) 785 rt->rt_genmask = info.rti_info[RTAX_GENMASK]; 786 /* FALLTHROUGH */ 787 case RTM_LOCK: 788 /* We don't support locks anymore */ 789 break; 790 } 791 RT_UNLOCK(rt); 792 break; 793 794 default: 795 senderr(EOPNOTSUPP); 796 } 797 798 flush: 799 if (rtm) { 800 if (error) 801 rtm->rtm_errno = error; 802 else 803 rtm->rtm_flags |= RTF_DONE; 804 } 805 if (rt) /* XXX can this be true? */ 806 RTFREE(rt); 807 { 808 struct rawcb *rp = NULL; 809 /* 810 * Check to see if we don't want our own messages. 811 */ 812 if ((so->so_options & SO_USELOOPBACK) == 0) { 813 if (route_cb.any_count <= 1) { 814 if (rtm) 815 Free(rtm); 816 m_freem(m); 817 return (error); 818 } 819 /* There is another listener, so construct message */ 820 rp = sotorawcb(so); 821 } 822 if (rtm) { 823 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm); 824 if (m->m_pkthdr.len < rtm->rtm_msglen) { 825 m_freem(m); 826 m = NULL; 827 } else if (m->m_pkthdr.len > rtm->rtm_msglen) 828 m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len); 829 Free(rtm); 830 } 831 if (m) { 832 M_SETFIB(m, so->so_fibnum); 833 m->m_flags |= RTS_FILTER_FIB; 834 if (rp) { 835 /* 836 * XXX insure we don't get a copy by 837 * invalidating our protocol 838 */ 839 unsigned short family = rp->rcb_proto.sp_family; 840 rp->rcb_proto.sp_family = 0; 841 rt_dispatch(m, info.rti_info[RTAX_DST]); 842 rp->rcb_proto.sp_family = family; 843 } else 844 rt_dispatch(m, info.rti_info[RTAX_DST]); 845 } 846 } 847 return (error); 848 #undef sa_equal 849 } 850 851 static void 852 rt_setmetrics(u_long which, const struct rt_metrics *in, 853 struct rt_metrics_lite *out) 854 { 855 #define metric(f, e) if (which & (f)) out->e = in->e; 856 /* 857 * Only these are stored in the routing entry since introduction 858 * of tcp hostcache. The rest is ignored. 859 */ 860 metric(RTV_MTU, rmx_mtu); 861 /* Userland -> kernel timebase conversion. */ 862 if (which & RTV_EXPIRE) 863 out->rmx_expire = in->rmx_expire ? 864 in->rmx_expire - time_second + time_uptime : 0; 865 #undef metric 866 } 867 868 static void 869 rt_getmetrics(const struct rt_metrics_lite *in, struct rt_metrics *out) 870 { 871 #define metric(e) out->e = in->e; 872 bzero(out, sizeof(*out)); 873 metric(rmx_mtu); 874 /* Kernel -> userland timebase conversion. */ 875 out->rmx_expire = in->rmx_expire ? 876 in->rmx_expire - time_uptime + time_second : 0; 877 #undef metric 878 } 879 880 /* 881 * Extract the addresses of the passed sockaddrs. 882 * Do a little sanity checking so as to avoid bad memory references. 883 * This data is derived straight from userland. 884 */ 885 static int 886 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo) 887 { 888 struct sockaddr *sa; 889 int i; 890 891 for (i = 0; i < RTAX_MAX && cp < cplim; i++) { 892 if ((rtinfo->rti_addrs & (1 << i)) == 0) 893 continue; 894 sa = (struct sockaddr *)cp; 895 /* 896 * It won't fit. 897 */ 898 if (cp + sa->sa_len > cplim) 899 return (EINVAL); 900 /* 901 * there are no more.. quit now 902 * If there are more bits, they are in error. 903 * I've seen this. route(1) can evidently generate these. 904 * This causes kernel to core dump. 905 * for compatibility, If we see this, point to a safe address. 906 */ 907 if (sa->sa_len == 0) { 908 rtinfo->rti_info[i] = &sa_zero; 909 return (0); /* should be EINVAL but for compat */ 910 } 911 /* accept it */ 912 rtinfo->rti_info[i] = sa; 913 cp += SA_SIZE(sa); 914 } 915 return (0); 916 } 917 918 /* 919 * Used by the routing socket. 920 */ 921 static struct mbuf * 922 rt_msg1(int type, struct rt_addrinfo *rtinfo) 923 { 924 struct rt_msghdr *rtm; 925 struct mbuf *m; 926 int i; 927 struct sockaddr *sa; 928 int len, dlen; 929 930 switch (type) { 931 932 case RTM_DELADDR: 933 case RTM_NEWADDR: 934 len = sizeof(struct ifa_msghdr); 935 break; 936 937 case RTM_DELMADDR: 938 case RTM_NEWMADDR: 939 len = sizeof(struct ifma_msghdr); 940 break; 941 942 case RTM_IFINFO: 943 len = sizeof(struct if_msghdr); 944 break; 945 946 case RTM_IFANNOUNCE: 947 case RTM_IEEE80211: 948 len = sizeof(struct if_announcemsghdr); 949 break; 950 951 default: 952 len = sizeof(struct rt_msghdr); 953 } 954 if (len > MCLBYTES) 955 panic("rt_msg1"); 956 m = m_gethdr(M_DONTWAIT, MT_DATA); 957 if (m && len > MHLEN) { 958 MCLGET(m, M_DONTWAIT); 959 if ((m->m_flags & M_EXT) == 0) { 960 m_free(m); 961 m = NULL; 962 } 963 } 964 if (m == NULL) 965 return (m); 966 m->m_pkthdr.len = m->m_len = len; 967 m->m_pkthdr.rcvif = NULL; 968 rtm = mtod(m, struct rt_msghdr *); 969 bzero((caddr_t)rtm, len); 970 for (i = 0; i < RTAX_MAX; i++) { 971 if ((sa = rtinfo->rti_info[i]) == NULL) 972 continue; 973 rtinfo->rti_addrs |= (1 << i); 974 dlen = SA_SIZE(sa); 975 m_copyback(m, len, dlen, (caddr_t)sa); 976 len += dlen; 977 } 978 if (m->m_pkthdr.len != len) { 979 m_freem(m); 980 return (NULL); 981 } 982 rtm->rtm_msglen = len; 983 rtm->rtm_version = RTM_VERSION; 984 rtm->rtm_type = type; 985 return (m); 986 } 987 988 /* 989 * Used by the sysctl code and routing socket. 990 */ 991 static int 992 rt_msg2(int type, struct rt_addrinfo *rtinfo, caddr_t cp, struct walkarg *w) 993 { 994 int i; 995 int len, dlen, second_time = 0; 996 caddr_t cp0; 997 998 rtinfo->rti_addrs = 0; 999 again: 1000 switch (type) { 1001 1002 case RTM_DELADDR: 1003 case RTM_NEWADDR: 1004 if (w != NULL && w->w_op == NET_RT_IFLISTL) { 1005 #ifdef COMPAT_FREEBSD32 1006 if (w->w_req->flags & SCTL_MASK32) 1007 len = sizeof(struct ifa_msghdrl32); 1008 else 1009 #endif 1010 len = sizeof(struct ifa_msghdrl); 1011 } else 1012 len = sizeof(struct ifa_msghdr); 1013 break; 1014 1015 case RTM_IFINFO: 1016 #ifdef COMPAT_FREEBSD32 1017 if (w != NULL && w->w_req->flags & SCTL_MASK32) { 1018 if (w->w_op == NET_RT_IFLISTL) 1019 len = sizeof(struct if_msghdrl32); 1020 else 1021 len = sizeof(struct if_msghdr32); 1022 break; 1023 } 1024 #endif 1025 if (w != NULL && w->w_op == NET_RT_IFLISTL) 1026 len = sizeof(struct if_msghdrl); 1027 else 1028 len = sizeof(struct if_msghdr); 1029 break; 1030 1031 case RTM_NEWMADDR: 1032 len = sizeof(struct ifma_msghdr); 1033 break; 1034 1035 default: 1036 len = sizeof(struct rt_msghdr); 1037 } 1038 cp0 = cp; 1039 if (cp0) 1040 cp += len; 1041 for (i = 0; i < RTAX_MAX; i++) { 1042 struct sockaddr *sa; 1043 1044 if ((sa = rtinfo->rti_info[i]) == NULL) 1045 continue; 1046 rtinfo->rti_addrs |= (1 << i); 1047 dlen = SA_SIZE(sa); 1048 if (cp) { 1049 bcopy((caddr_t)sa, cp, (unsigned)dlen); 1050 cp += dlen; 1051 } 1052 len += dlen; 1053 } 1054 len = ALIGN(len); 1055 if (cp == NULL && w != NULL && !second_time) { 1056 struct walkarg *rw = w; 1057 1058 if (rw->w_req) { 1059 if (rw->w_tmemsize < len) { 1060 if (rw->w_tmem) 1061 free(rw->w_tmem, M_RTABLE); 1062 rw->w_tmem = (caddr_t) 1063 malloc(len, M_RTABLE, M_NOWAIT); 1064 if (rw->w_tmem) 1065 rw->w_tmemsize = len; 1066 } 1067 if (rw->w_tmem) { 1068 cp = rw->w_tmem; 1069 second_time = 1; 1070 goto again; 1071 } 1072 } 1073 } 1074 if (cp) { 1075 struct rt_msghdr *rtm = (struct rt_msghdr *)cp0; 1076 1077 rtm->rtm_version = RTM_VERSION; 1078 rtm->rtm_type = type; 1079 rtm->rtm_msglen = len; 1080 } 1081 return (len); 1082 } 1083 1084 /* 1085 * This routine is called to generate a message from the routing 1086 * socket indicating that a redirect has occured, a routing lookup 1087 * has failed, or that a protocol has detected timeouts to a particular 1088 * destination. 1089 */ 1090 void 1091 rt_missmsg_fib(int type, struct rt_addrinfo *rtinfo, int flags, int error, 1092 int fibnum) 1093 { 1094 struct rt_msghdr *rtm; 1095 struct mbuf *m; 1096 struct sockaddr *sa = rtinfo->rti_info[RTAX_DST]; 1097 1098 if (route_cb.any_count == 0) 1099 return; 1100 m = rt_msg1(type, rtinfo); 1101 if (m == NULL) 1102 return; 1103 1104 if (fibnum != RTS_ALLFIBS) { 1105 KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: fibnum out " 1106 "of range 0 <= %d < %d", __func__, fibnum, rt_numfibs)); 1107 M_SETFIB(m, fibnum); 1108 m->m_flags |= RTS_FILTER_FIB; 1109 } 1110 1111 rtm = mtod(m, struct rt_msghdr *); 1112 rtm->rtm_flags = RTF_DONE | flags; 1113 rtm->rtm_errno = error; 1114 rtm->rtm_addrs = rtinfo->rti_addrs; 1115 rt_dispatch(m, sa); 1116 } 1117 1118 void 1119 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error) 1120 { 1121 1122 rt_missmsg_fib(type, rtinfo, flags, error, RTS_ALLFIBS); 1123 } 1124 1125 /* 1126 * This routine is called to generate a message from the routing 1127 * socket indicating that the status of a network interface has changed. 1128 */ 1129 void 1130 rt_ifmsg(struct ifnet *ifp) 1131 { 1132 struct if_msghdr *ifm; 1133 struct mbuf *m; 1134 struct rt_addrinfo info; 1135 1136 if (route_cb.any_count == 0) 1137 return; 1138 bzero((caddr_t)&info, sizeof(info)); 1139 m = rt_msg1(RTM_IFINFO, &info); 1140 if (m == NULL) 1141 return; 1142 ifm = mtod(m, struct if_msghdr *); 1143 ifm->ifm_index = ifp->if_index; 1144 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags; 1145 ifm->ifm_data = ifp->if_data; 1146 ifm->ifm_addrs = 0; 1147 rt_dispatch(m, NULL); 1148 } 1149 1150 /* 1151 * This is called to generate messages from the routing socket 1152 * indicating a network interface has had addresses associated with it. 1153 * if we ever reverse the logic and replace messages TO the routing 1154 * socket indicate a request to configure interfaces, then it will 1155 * be unnecessary as the routing socket will automatically generate 1156 * copies of it. 1157 */ 1158 void 1159 rt_newaddrmsg_fib(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt, 1160 int fibnum) 1161 { 1162 struct rt_addrinfo info; 1163 struct sockaddr *sa = NULL; 1164 int pass; 1165 struct mbuf *m = NULL; 1166 struct ifnet *ifp = ifa->ifa_ifp; 1167 1168 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 1169 ("unexpected cmd %u", cmd)); 1170 #ifdef SCTP 1171 /* 1172 * notify the SCTP stack 1173 * this will only get called when an address is added/deleted 1174 * XXX pass the ifaddr struct instead if ifa->ifa_addr... 1175 */ 1176 sctp_addr_change(ifa, cmd); 1177 #endif /* SCTP */ 1178 if (route_cb.any_count == 0) 1179 return; 1180 for (pass = 1; pass < 3; pass++) { 1181 bzero((caddr_t)&info, sizeof(info)); 1182 if ((cmd == RTM_ADD && pass == 1) || 1183 (cmd == RTM_DELETE && pass == 2)) { 1184 struct ifa_msghdr *ifam; 1185 int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR; 1186 1187 info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr; 1188 info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr; 1189 info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask; 1190 info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr; 1191 if ((m = rt_msg1(ncmd, &info)) == NULL) 1192 continue; 1193 ifam = mtod(m, struct ifa_msghdr *); 1194 ifam->ifam_index = ifp->if_index; 1195 ifam->ifam_metric = ifa->ifa_metric; 1196 ifam->ifam_flags = ifa->ifa_flags; 1197 ifam->ifam_addrs = info.rti_addrs; 1198 } 1199 if ((cmd == RTM_ADD && pass == 2) || 1200 (cmd == RTM_DELETE && pass == 1)) { 1201 struct rt_msghdr *rtm; 1202 1203 if (rt == NULL) 1204 continue; 1205 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 1206 info.rti_info[RTAX_DST] = sa = rt_key(rt); 1207 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 1208 if ((m = rt_msg1(cmd, &info)) == NULL) 1209 continue; 1210 rtm = mtod(m, struct rt_msghdr *); 1211 rtm->rtm_index = ifp->if_index; 1212 rtm->rtm_flags |= rt->rt_flags; 1213 rtm->rtm_errno = error; 1214 rtm->rtm_addrs = info.rti_addrs; 1215 } 1216 if (fibnum != RTS_ALLFIBS) { 1217 KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: " 1218 "fibnum out of range 0 <= %d < %d", __func__, 1219 fibnum, rt_numfibs)); 1220 M_SETFIB(m, fibnum); 1221 m->m_flags |= RTS_FILTER_FIB; 1222 } 1223 rt_dispatch(m, sa); 1224 } 1225 } 1226 1227 void 1228 rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt) 1229 { 1230 1231 rt_newaddrmsg_fib(cmd, ifa, error, rt, RTS_ALLFIBS); 1232 } 1233 1234 /* 1235 * This is the analogue to the rt_newaddrmsg which performs the same 1236 * function but for multicast group memberhips. This is easier since 1237 * there is no route state to worry about. 1238 */ 1239 void 1240 rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma) 1241 { 1242 struct rt_addrinfo info; 1243 struct mbuf *m = NULL; 1244 struct ifnet *ifp = ifma->ifma_ifp; 1245 struct ifma_msghdr *ifmam; 1246 1247 if (route_cb.any_count == 0) 1248 return; 1249 1250 bzero((caddr_t)&info, sizeof(info)); 1251 info.rti_info[RTAX_IFA] = ifma->ifma_addr; 1252 info.rti_info[RTAX_IFP] = ifp ? ifp->if_addr->ifa_addr : NULL; 1253 /* 1254 * If a link-layer address is present, present it as a ``gateway'' 1255 * (similarly to how ARP entries, e.g., are presented). 1256 */ 1257 info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr; 1258 m = rt_msg1(cmd, &info); 1259 if (m == NULL) 1260 return; 1261 ifmam = mtod(m, struct ifma_msghdr *); 1262 KASSERT(ifp != NULL, ("%s: link-layer multicast address w/o ifp\n", 1263 __func__)); 1264 ifmam->ifmam_index = ifp->if_index; 1265 ifmam->ifmam_addrs = info.rti_addrs; 1266 rt_dispatch(m, ifma->ifma_addr); 1267 } 1268 1269 static struct mbuf * 1270 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what, 1271 struct rt_addrinfo *info) 1272 { 1273 struct if_announcemsghdr *ifan; 1274 struct mbuf *m; 1275 1276 if (route_cb.any_count == 0) 1277 return NULL; 1278 bzero((caddr_t)info, sizeof(*info)); 1279 m = rt_msg1(type, info); 1280 if (m != NULL) { 1281 ifan = mtod(m, struct if_announcemsghdr *); 1282 ifan->ifan_index = ifp->if_index; 1283 strlcpy(ifan->ifan_name, ifp->if_xname, 1284 sizeof(ifan->ifan_name)); 1285 ifan->ifan_what = what; 1286 } 1287 return m; 1288 } 1289 1290 /* 1291 * This is called to generate routing socket messages indicating 1292 * IEEE80211 wireless events. 1293 * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way. 1294 */ 1295 void 1296 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len) 1297 { 1298 struct mbuf *m; 1299 struct rt_addrinfo info; 1300 1301 m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info); 1302 if (m != NULL) { 1303 /* 1304 * Append the ieee80211 data. Try to stick it in the 1305 * mbuf containing the ifannounce msg; otherwise allocate 1306 * a new mbuf and append. 1307 * 1308 * NB: we assume m is a single mbuf. 1309 */ 1310 if (data_len > M_TRAILINGSPACE(m)) { 1311 struct mbuf *n = m_get(M_NOWAIT, MT_DATA); 1312 if (n == NULL) { 1313 m_freem(m); 1314 return; 1315 } 1316 bcopy(data, mtod(n, void *), data_len); 1317 n->m_len = data_len; 1318 m->m_next = n; 1319 } else if (data_len > 0) { 1320 bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len); 1321 m->m_len += data_len; 1322 } 1323 if (m->m_flags & M_PKTHDR) 1324 m->m_pkthdr.len += data_len; 1325 mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len; 1326 rt_dispatch(m, NULL); 1327 } 1328 } 1329 1330 /* 1331 * This is called to generate routing socket messages indicating 1332 * network interface arrival and departure. 1333 */ 1334 void 1335 rt_ifannouncemsg(struct ifnet *ifp, int what) 1336 { 1337 struct mbuf *m; 1338 struct rt_addrinfo info; 1339 1340 m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info); 1341 if (m != NULL) 1342 rt_dispatch(m, NULL); 1343 } 1344 1345 static void 1346 rt_dispatch(struct mbuf *m, const struct sockaddr *sa) 1347 { 1348 struct m_tag *tag; 1349 1350 /* 1351 * Preserve the family from the sockaddr, if any, in an m_tag for 1352 * use when injecting the mbuf into the routing socket buffer from 1353 * the netisr. 1354 */ 1355 if (sa != NULL) { 1356 tag = m_tag_get(PACKET_TAG_RTSOCKFAM, sizeof(unsigned short), 1357 M_NOWAIT); 1358 if (tag == NULL) { 1359 m_freem(m); 1360 return; 1361 } 1362 *(unsigned short *)(tag + 1) = sa->sa_family; 1363 m_tag_prepend(m, tag); 1364 } 1365 netisr_queue(NETISR_ROUTE, m); /* mbuf is free'd on failure. */ 1366 } 1367 1368 /* 1369 * This is used in dumping the kernel table via sysctl(). 1370 */ 1371 static int 1372 sysctl_dumpentry(struct radix_node *rn, void *vw) 1373 { 1374 struct walkarg *w = vw; 1375 struct rtentry *rt = (struct rtentry *)rn; 1376 int error = 0, size; 1377 struct rt_addrinfo info; 1378 1379 if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg)) 1380 return 0; 1381 if ((rt->rt_flags & RTF_HOST) == 0 1382 ? jailed(w->w_req->td->td_ucred) 1383 : prison_if(w->w_req->td->td_ucred, rt_key(rt)) != 0) 1384 return (0); 1385 bzero((caddr_t)&info, sizeof(info)); 1386 info.rti_info[RTAX_DST] = rt_key(rt); 1387 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 1388 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 1389 info.rti_info[RTAX_GENMASK] = rt->rt_genmask; 1390 if (rt->rt_ifp) { 1391 info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr; 1392 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 1393 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT) 1394 info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr; 1395 } 1396 size = rt_msg2(RTM_GET, &info, NULL, w); 1397 if (w->w_req && w->w_tmem) { 1398 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem; 1399 1400 rtm->rtm_flags = rt->rt_flags; 1401 rtm->rtm_use = rt->rt_rmx.rmx_pksent; 1402 rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx); 1403 rtm->rtm_index = rt->rt_ifp->if_index; 1404 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0; 1405 rtm->rtm_addrs = info.rti_addrs; 1406 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size); 1407 return (error); 1408 } 1409 return (error); 1410 } 1411 1412 static int 1413 sysctl_iflist_ifml(struct ifnet *ifp, struct rt_addrinfo *info, 1414 struct walkarg *w, int len) 1415 { 1416 struct if_msghdrl *ifm; 1417 1418 #ifdef COMPAT_FREEBSD32 1419 if (w->w_req->flags & SCTL_MASK32) { 1420 struct if_msghdrl32 *ifm32; 1421 1422 ifm32 = (struct if_msghdrl32 *)w->w_tmem; 1423 ifm32->ifm_addrs = info->rti_addrs; 1424 ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags; 1425 ifm32->ifm_index = ifp->if_index; 1426 ifm32->_ifm_spare1 = 0; 1427 ifm32->ifm_len = sizeof(*ifm32); 1428 ifm32->ifm_data_off = offsetof(struct if_msghdrl32, ifm_data); 1429 1430 copy_ifdata32(&ifp->if_data, &ifm32->ifm_data); 1431 1432 return (SYSCTL_OUT(w->w_req, (caddr_t)ifm32, len)); 1433 } 1434 #endif 1435 ifm = (struct if_msghdrl *)w->w_tmem; 1436 ifm->ifm_addrs = info->rti_addrs; 1437 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags; 1438 ifm->ifm_index = ifp->if_index; 1439 ifm->_ifm_spare1 = 0; 1440 ifm->ifm_len = sizeof(*ifm); 1441 ifm->ifm_data_off = offsetof(struct if_msghdrl, ifm_data); 1442 1443 ifm->ifm_data = ifp->if_data; 1444 1445 return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len)); 1446 } 1447 1448 static int 1449 sysctl_iflist_ifm(struct ifnet *ifp, struct rt_addrinfo *info, 1450 struct walkarg *w, int len) 1451 { 1452 struct if_msghdr *ifm; 1453 1454 #ifdef COMPAT_FREEBSD32 1455 if (w->w_req->flags & SCTL_MASK32) { 1456 struct if_msghdr32 *ifm32; 1457 1458 ifm32 = (struct if_msghdr32 *)w->w_tmem; 1459 ifm32->ifm_addrs = info->rti_addrs; 1460 ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags; 1461 ifm32->ifm_index = ifp->if_index; 1462 1463 copy_ifdata32(&ifp->if_data, &ifm32->ifm_data); 1464 1465 return (SYSCTL_OUT(w->w_req, (caddr_t)ifm32, len)); 1466 } 1467 #endif 1468 ifm = (struct if_msghdr *)w->w_tmem; 1469 ifm->ifm_addrs = info->rti_addrs; 1470 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags; 1471 ifm->ifm_index = ifp->if_index; 1472 1473 ifm->ifm_data = ifp->if_data; 1474 1475 return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len)); 1476 } 1477 1478 static int 1479 sysctl_iflist_ifaml(struct ifaddr *ifa, struct rt_addrinfo *info, 1480 struct walkarg *w, int len) 1481 { 1482 struct ifa_msghdrl *ifam; 1483 1484 #ifdef COMPAT_FREEBSD32 1485 if (w->w_req->flags & SCTL_MASK32) { 1486 struct ifa_msghdrl32 *ifam32; 1487 1488 ifam32 = (struct ifa_msghdrl32 *)w->w_tmem; 1489 ifam32->ifam_addrs = info->rti_addrs; 1490 ifam32->ifam_flags = ifa->ifa_flags; 1491 ifam32->ifam_index = ifa->ifa_ifp->if_index; 1492 ifam32->_ifam_spare1 = 0; 1493 ifam32->ifam_len = sizeof(*ifam32); 1494 ifam32->ifam_data_off = 1495 offsetof(struct ifa_msghdrl32, ifam_data); 1496 ifam32->ifam_metric = ifa->ifa_metric; 1497 1498 copy_ifdata32(&ifa->ifa_ifp->if_data, &ifam32->ifam_data); 1499 1500 return (SYSCTL_OUT(w->w_req, (caddr_t)ifam32, len)); 1501 } 1502 #endif 1503 1504 ifam = (struct ifa_msghdrl *)w->w_tmem; 1505 ifam->ifam_addrs = info->rti_addrs; 1506 ifam->ifam_flags = ifa->ifa_flags; 1507 ifam->ifam_index = ifa->ifa_ifp->if_index; 1508 ifam->_ifam_spare1 = 0; 1509 ifam->ifam_len = sizeof(*ifam); 1510 ifam->ifam_data_off = offsetof(struct ifa_msghdrl, ifam_data); 1511 ifam->ifam_metric = ifa->ifa_metric; 1512 1513 ifam->ifam_data = ifa->if_data; 1514 1515 return (SYSCTL_OUT(w->w_req, w->w_tmem, len)); 1516 } 1517 1518 static int 1519 sysctl_iflist_ifam(struct ifaddr *ifa, struct rt_addrinfo *info, 1520 struct walkarg *w, int len) 1521 { 1522 struct ifa_msghdr *ifam; 1523 1524 ifam = (struct ifa_msghdr *)w->w_tmem; 1525 ifam->ifam_addrs = info->rti_addrs; 1526 ifam->ifam_flags = ifa->ifa_flags; 1527 ifam->ifam_index = ifa->ifa_ifp->if_index; 1528 ifam->ifam_metric = ifa->ifa_metric; 1529 1530 return (SYSCTL_OUT(w->w_req, w->w_tmem, len)); 1531 } 1532 1533 static int 1534 sysctl_iflist(int af, struct walkarg *w) 1535 { 1536 struct ifnet *ifp; 1537 struct ifaddr *ifa; 1538 struct rt_addrinfo info; 1539 int len, error = 0; 1540 1541 bzero((caddr_t)&info, sizeof(info)); 1542 IFNET_RLOCK(); 1543 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1544 if (w->w_arg && w->w_arg != ifp->if_index) 1545 continue; 1546 IF_ADDR_LOCK(ifp); 1547 ifa = ifp->if_addr; 1548 info.rti_info[RTAX_IFP] = ifa->ifa_addr; 1549 len = rt_msg2(RTM_IFINFO, &info, NULL, w); 1550 info.rti_info[RTAX_IFP] = NULL; 1551 if (w->w_req && w->w_tmem) { 1552 if (w->w_op == NET_RT_IFLISTL) 1553 error = sysctl_iflist_ifml(ifp, &info, w, len); 1554 else 1555 error = sysctl_iflist_ifm(ifp, &info, w, len); 1556 if (error) 1557 goto done; 1558 } 1559 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != NULL) { 1560 if (af && af != ifa->ifa_addr->sa_family) 1561 continue; 1562 if (prison_if(w->w_req->td->td_ucred, 1563 ifa->ifa_addr) != 0) 1564 continue; 1565 info.rti_info[RTAX_IFA] = ifa->ifa_addr; 1566 info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask; 1567 info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr; 1568 len = rt_msg2(RTM_NEWADDR, &info, NULL, w); 1569 if (w->w_req && w->w_tmem) { 1570 if (w->w_op == NET_RT_IFLISTL) 1571 error = sysctl_iflist_ifaml(ifa, &info, 1572 w, len); 1573 else 1574 error = sysctl_iflist_ifam(ifa, &info, 1575 w, len); 1576 if (error) 1577 goto done; 1578 } 1579 } 1580 IF_ADDR_UNLOCK(ifp); 1581 info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] = 1582 info.rti_info[RTAX_BRD] = NULL; 1583 } 1584 done: 1585 if (ifp != NULL) 1586 IF_ADDR_UNLOCK(ifp); 1587 IFNET_RUNLOCK(); 1588 return (error); 1589 } 1590 1591 static int 1592 sysctl_ifmalist(int af, struct walkarg *w) 1593 { 1594 struct ifnet *ifp; 1595 struct ifmultiaddr *ifma; 1596 struct rt_addrinfo info; 1597 int len, error = 0; 1598 struct ifaddr *ifa; 1599 1600 bzero((caddr_t)&info, sizeof(info)); 1601 IFNET_RLOCK(); 1602 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1603 if (w->w_arg && w->w_arg != ifp->if_index) 1604 continue; 1605 ifa = ifp->if_addr; 1606 info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL; 1607 IF_ADDR_LOCK(ifp); 1608 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1609 if (af && af != ifma->ifma_addr->sa_family) 1610 continue; 1611 if (prison_if(w->w_req->td->td_ucred, 1612 ifma->ifma_addr) != 0) 1613 continue; 1614 info.rti_info[RTAX_IFA] = ifma->ifma_addr; 1615 info.rti_info[RTAX_GATEWAY] = 1616 (ifma->ifma_addr->sa_family != AF_LINK) ? 1617 ifma->ifma_lladdr : NULL; 1618 len = rt_msg2(RTM_NEWMADDR, &info, NULL, w); 1619 if (w->w_req && w->w_tmem) { 1620 struct ifma_msghdr *ifmam; 1621 1622 ifmam = (struct ifma_msghdr *)w->w_tmem; 1623 ifmam->ifmam_index = ifma->ifma_ifp->if_index; 1624 ifmam->ifmam_flags = 0; 1625 ifmam->ifmam_addrs = info.rti_addrs; 1626 error = SYSCTL_OUT(w->w_req, w->w_tmem, len); 1627 if (error) { 1628 IF_ADDR_UNLOCK(ifp); 1629 goto done; 1630 } 1631 } 1632 } 1633 IF_ADDR_UNLOCK(ifp); 1634 } 1635 done: 1636 IFNET_RUNLOCK(); 1637 return (error); 1638 } 1639 1640 static int 1641 sysctl_rtsock(SYSCTL_HANDLER_ARGS) 1642 { 1643 int *name = (int *)arg1; 1644 u_int namelen = arg2; 1645 struct radix_node_head *rnh; 1646 int i, lim, error = EINVAL; 1647 u_char af; 1648 struct walkarg w; 1649 1650 name ++; 1651 namelen--; 1652 if (req->newptr) 1653 return (EPERM); 1654 if (namelen != 3) 1655 return ((namelen < 3) ? EISDIR : ENOTDIR); 1656 af = name[0]; 1657 if (af > AF_MAX) 1658 return (EINVAL); 1659 bzero(&w, sizeof(w)); 1660 w.w_op = name[1]; 1661 w.w_arg = name[2]; 1662 w.w_req = req; 1663 1664 error = sysctl_wire_old_buffer(req, 0); 1665 if (error) 1666 return (error); 1667 switch (w.w_op) { 1668 1669 case NET_RT_DUMP: 1670 case NET_RT_FLAGS: 1671 if (af == 0) { /* dump all tables */ 1672 i = 1; 1673 lim = AF_MAX; 1674 } else /* dump only one table */ 1675 i = lim = af; 1676 for (error = 0; error == 0 && i <= lim; i++) 1677 if ((rnh = rt_tables[req->td->td_proc->p_fibnum][i]) != NULL) { 1678 RADIX_NODE_HEAD_LOCK(rnh); 1679 error = rnh->rnh_walktree(rnh, 1680 sysctl_dumpentry, &w); 1681 RADIX_NODE_HEAD_UNLOCK(rnh); 1682 } else if (af != 0) 1683 error = EAFNOSUPPORT; 1684 break; 1685 1686 case NET_RT_IFLIST: 1687 case NET_RT_IFLISTL: 1688 error = sysctl_iflist(af, &w); 1689 break; 1690 1691 case NET_RT_IFMALIST: 1692 error = sysctl_ifmalist(af, &w); 1693 break; 1694 } 1695 if (w.w_tmem) 1696 free(w.w_tmem, M_RTABLE); 1697 return (error); 1698 } 1699 1700 SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, ""); 1701 1702 /* 1703 * Definitions of protocols supported in the ROUTE domain. 1704 */ 1705 1706 static struct domain routedomain; /* or at least forward */ 1707 1708 static struct protosw routesw[] = { 1709 { 1710 .pr_type = SOCK_RAW, 1711 .pr_domain = &routedomain, 1712 .pr_flags = PR_ATOMIC|PR_ADDR, 1713 .pr_output = route_output, 1714 .pr_ctlinput = raw_ctlinput, 1715 .pr_init = raw_init, 1716 .pr_usrreqs = &route_usrreqs 1717 } 1718 }; 1719 1720 static struct domain routedomain = { 1721 .dom_family = PF_ROUTE, 1722 .dom_name = "route", 1723 .dom_protosw = routesw, 1724 .dom_protoswNPROTOSW = &routesw[sizeof(routesw)/sizeof(routesw[0])] 1725 }; 1726 1727 DOMAIN_SET(route);
Cache object: b76d196b4a1dcce3242e69bcc5f0b48b
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