Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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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: releng/6.0/sys/net/rtsock.c 150355 2005-09-20 01:59:54Z csjp $ 31 */ 32 33 #include <sys/param.h> 34 #include <sys/domain.h> 35 #include <sys/kernel.h> 36 #include <sys/jail.h> 37 #include <sys/malloc.h> 38 #include <sys/mbuf.h> 39 #include <sys/proc.h> 40 #include <sys/protosw.h> 41 #include <sys/signalvar.h> 42 #include <sys/socket.h> 43 #include <sys/socketvar.h> 44 #include <sys/sysctl.h> 45 #include <sys/systm.h> 46 47 #include <net/if.h> 48 #include <net/netisr.h> 49 #include <net/raw_cb.h> 50 #include <net/route.h> 51 52 #include <netinet/in.h> 53 54 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables"); 55 56 /* NB: these are not modified */ 57 static struct sockaddr route_dst = { 2, PF_ROUTE, }; 58 static struct sockaddr route_src = { 2, PF_ROUTE, }; 59 static struct sockaddr sa_zero = { sizeof(sa_zero), AF_INET, }; 60 61 static struct { 62 int ip_count; /* attached w/ AF_INET */ 63 int ip6_count; /* attached w/ AF_INET6 */ 64 int ipx_count; /* attached w/ AF_IPX */ 65 int any_count; /* total attached */ 66 } route_cb; 67 68 struct mtx rtsock_mtx; 69 MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF); 70 71 #define RTSOCK_LOCK() mtx_lock(&rtsock_mtx) 72 #define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx) 73 #define RTSOCK_LOCK_ASSERT() mtx_assert(&rtsock_mtx, MA_OWNED) 74 75 static struct ifqueue rtsintrq; 76 77 SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD, 0, ""); 78 SYSCTL_INT(_net_route, OID_AUTO, netisr_maxqlen, CTLFLAG_RW, 79 &rtsintrq.ifq_maxlen, 0, "maximum routing socket dispatch queue length"); 80 81 struct walkarg { 82 int w_tmemsize; 83 int w_op, w_arg; 84 caddr_t w_tmem; 85 struct sysctl_req *w_req; 86 }; 87 88 static void rts_input(struct mbuf *m); 89 static struct mbuf *rt_msg1(int type, struct rt_addrinfo *rtinfo); 90 static int rt_msg2(int type, struct rt_addrinfo *rtinfo, 91 caddr_t cp, struct walkarg *w); 92 static int rt_xaddrs(caddr_t cp, caddr_t cplim, 93 struct rt_addrinfo *rtinfo); 94 static int sysctl_dumpentry(struct radix_node *rn, void *vw); 95 static int sysctl_iflist(int af, struct walkarg *w); 96 static int sysctl_ifmalist(int af, struct walkarg *w); 97 static int route_output(struct mbuf *m, struct socket *so); 98 static void rt_setmetrics(u_long which, const struct rt_metrics *in, 99 struct rt_metrics_lite *out); 100 static void rt_getmetrics(const struct rt_metrics_lite *in, 101 struct rt_metrics *out); 102 static void rt_dispatch(struct mbuf *, const struct sockaddr *); 103 104 static void 105 rts_init(void) 106 { 107 int tmp; 108 109 rtsintrq.ifq_maxlen = 256; 110 if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp)) 111 rtsintrq.ifq_maxlen = tmp; 112 mtx_init(&rtsintrq.ifq_mtx, "rts_inq", NULL, MTX_DEF); 113 netisr_register(NETISR_ROUTE, rts_input, &rtsintrq, NETISR_MPSAFE); 114 } 115 SYSINIT(rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rts_init, 0) 116 117 static void 118 rts_input(struct mbuf *m) 119 { 120 struct sockproto route_proto; 121 unsigned short *family; 122 struct m_tag *tag; 123 124 route_proto.sp_family = PF_ROUTE; 125 tag = m_tag_find(m, PACKET_TAG_RTSOCKFAM, NULL); 126 if (tag != NULL) { 127 family = (unsigned short *)(tag + 1); 128 route_proto.sp_protocol = *family; 129 m_tag_delete(m, tag); 130 } else 131 route_proto.sp_protocol = 0; 132 133 raw_input(m, &route_proto, &route_src, &route_dst); 134 } 135 136 /* 137 * It really doesn't make any sense at all for this code to share much 138 * with raw_usrreq.c, since its functionality is so restricted. XXX 139 */ 140 static int 141 rts_abort(struct socket *so) 142 { 143 144 return (raw_usrreqs.pru_abort(so)); 145 } 146 147 /* pru_accept is EOPNOTSUPP */ 148 149 static int 150 rts_attach(struct socket *so, int proto, struct thread *td) 151 { 152 struct rawcb *rp; 153 int s, error; 154 155 if (sotorawcb(so) != NULL) 156 return EISCONN; /* XXX panic? */ 157 /* XXX */ 158 MALLOC(rp, struct rawcb *, sizeof *rp, M_PCB, M_WAITOK | M_ZERO); 159 if (rp == NULL) 160 return ENOBUFS; 161 162 /* 163 * The splnet() is necessary to block protocols from sending 164 * error notifications (like RTM_REDIRECT or RTM_LOSING) while 165 * this PCB is extant but incompletely initialized. 166 * Probably we should try to do more of this work beforehand and 167 * eliminate the spl. 168 */ 169 s = splnet(); 170 so->so_pcb = (caddr_t)rp; 171 error = raw_attach(so, proto); 172 rp = sotorawcb(so); 173 if (error) { 174 splx(s); 175 so->so_pcb = NULL; 176 free(rp, M_PCB); 177 return error; 178 } 179 RTSOCK_LOCK(); 180 switch(rp->rcb_proto.sp_protocol) { 181 case AF_INET: 182 route_cb.ip_count++; 183 break; 184 case AF_INET6: 185 route_cb.ip6_count++; 186 break; 187 case AF_IPX: 188 route_cb.ipx_count++; 189 break; 190 } 191 rp->rcb_faddr = &route_src; 192 route_cb.any_count++; 193 RTSOCK_UNLOCK(); 194 soisconnected(so); 195 so->so_options |= SO_USELOOPBACK; 196 splx(s); 197 return 0; 198 } 199 200 static int 201 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 202 { 203 204 return (raw_usrreqs.pru_bind(so, nam, td)); /* xxx just EINVAL */ 205 } 206 207 static int 208 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 209 { 210 211 return (raw_usrreqs.pru_connect(so, nam, td)); /* XXX just EINVAL */ 212 } 213 214 /* pru_connect2 is EOPNOTSUPP */ 215 /* pru_control is EOPNOTSUPP */ 216 217 static int 218 rts_detach(struct socket *so) 219 { 220 struct rawcb *rp = sotorawcb(so); 221 int s, error; 222 223 s = splnet(); 224 if (rp != NULL) { 225 RTSOCK_LOCK(); 226 switch(rp->rcb_proto.sp_protocol) { 227 case AF_INET: 228 route_cb.ip_count--; 229 break; 230 case AF_INET6: 231 route_cb.ip6_count--; 232 break; 233 case AF_IPX: 234 route_cb.ipx_count--; 235 break; 236 } 237 route_cb.any_count--; 238 RTSOCK_UNLOCK(); 239 } 240 error = raw_usrreqs.pru_detach(so); 241 splx(s); 242 return error; 243 } 244 245 static int 246 rts_disconnect(struct socket *so) 247 { 248 249 return (raw_usrreqs.pru_disconnect(so)); 250 } 251 252 /* pru_listen is EOPNOTSUPP */ 253 254 static int 255 rts_peeraddr(struct socket *so, struct sockaddr **nam) 256 { 257 258 return (raw_usrreqs.pru_peeraddr(so, nam)); 259 } 260 261 /* pru_rcvd is EOPNOTSUPP */ 262 /* pru_rcvoob is EOPNOTSUPP */ 263 264 static int 265 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 266 struct mbuf *control, struct thread *td) 267 { 268 269 return (raw_usrreqs.pru_send(so, flags, m, nam, control, td)); 270 } 271 272 /* pru_sense is null */ 273 274 static int 275 rts_shutdown(struct socket *so) 276 { 277 278 return (raw_usrreqs.pru_shutdown(so)); 279 } 280 281 static int 282 rts_sockaddr(struct socket *so, struct sockaddr **nam) 283 { 284 285 return (raw_usrreqs.pru_sockaddr(so, nam)); 286 } 287 288 static struct pr_usrreqs route_usrreqs = { 289 .pru_abort = rts_abort, 290 .pru_attach = rts_attach, 291 .pru_bind = rts_bind, 292 .pru_connect = rts_connect, 293 .pru_detach = rts_detach, 294 .pru_disconnect = rts_disconnect, 295 .pru_peeraddr = rts_peeraddr, 296 .pru_send = rts_send, 297 .pru_shutdown = rts_shutdown, 298 .pru_sockaddr = rts_sockaddr, 299 }; 300 301 /*ARGSUSED*/ 302 static int 303 route_output(struct mbuf *m, struct socket *so) 304 { 305 #define sa_equal(a1, a2) (bcmp((a1), (a2), (a1)->sa_len) == 0) 306 struct rt_msghdr *rtm = NULL; 307 struct rtentry *rt = NULL; 308 struct radix_node_head *rnh; 309 struct rt_addrinfo info; 310 int len, error = 0; 311 struct ifnet *ifp = NULL; 312 struct ifaddr *ifa = NULL; 313 struct sockaddr_in jail; 314 315 #define senderr(e) { error = e; goto flush;} 316 if (m == NULL || ((m->m_len < sizeof(long)) && 317 (m = m_pullup(m, sizeof(long))) == NULL)) 318 return (ENOBUFS); 319 if ((m->m_flags & M_PKTHDR) == 0) 320 panic("route_output"); 321 len = m->m_pkthdr.len; 322 if (len < sizeof(*rtm) || 323 len != mtod(m, struct rt_msghdr *)->rtm_msglen) { 324 info.rti_info[RTAX_DST] = NULL; 325 senderr(EINVAL); 326 } 327 R_Malloc(rtm, struct rt_msghdr *, len); 328 if (rtm == NULL) { 329 info.rti_info[RTAX_DST] = NULL; 330 senderr(ENOBUFS); 331 } 332 m_copydata(m, 0, len, (caddr_t)rtm); 333 if (rtm->rtm_version != RTM_VERSION) { 334 info.rti_info[RTAX_DST] = NULL; 335 senderr(EPROTONOSUPPORT); 336 } 337 rtm->rtm_pid = curproc->p_pid; 338 bzero(&info, sizeof(info)); 339 info.rti_addrs = rtm->rtm_addrs; 340 if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info)) { 341 info.rti_info[RTAX_DST] = NULL; 342 senderr(EINVAL); 343 } 344 info.rti_flags = rtm->rtm_flags; 345 if (info.rti_info[RTAX_DST] == NULL || 346 info.rti_info[RTAX_DST]->sa_family >= AF_MAX || 347 (info.rti_info[RTAX_GATEWAY] != NULL && 348 info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX)) 349 senderr(EINVAL); 350 if (info.rti_info[RTAX_GENMASK]) { 351 struct radix_node *t; 352 t = rn_addmask((caddr_t) info.rti_info[RTAX_GENMASK], 0, 1); 353 if (t != NULL && 354 bcmp((char *)(void *)info.rti_info[RTAX_GENMASK] + 1, 355 (char *)(void *)t->rn_key + 1, 356 ((struct sockaddr *)t->rn_key)->sa_len - 1) == 0) 357 info.rti_info[RTAX_GENMASK] = 358 (struct sockaddr *)t->rn_key; 359 else 360 senderr(ENOBUFS); 361 } 362 363 /* 364 * Verify that the caller has the appropriate privilege; RTM_GET 365 * is the only operation the non-superuser is allowed. 366 */ 367 if (rtm->rtm_type != RTM_GET && (error = suser(curthread)) != 0) 368 senderr(error); 369 370 switch (rtm->rtm_type) { 371 struct rtentry *saved_nrt; 372 373 case RTM_ADD: 374 if (info.rti_info[RTAX_GATEWAY] == NULL) 375 senderr(EINVAL); 376 saved_nrt = NULL; 377 error = rtrequest1(RTM_ADD, &info, &saved_nrt); 378 if (error == 0 && saved_nrt) { 379 RT_LOCK(saved_nrt); 380 rt_setmetrics(rtm->rtm_inits, 381 &rtm->rtm_rmx, &saved_nrt->rt_rmx); 382 RT_REMREF(saved_nrt); 383 saved_nrt->rt_genmask = info.rti_info[RTAX_GENMASK]; 384 RT_UNLOCK(saved_nrt); 385 } 386 break; 387 388 case RTM_DELETE: 389 saved_nrt = NULL; 390 error = rtrequest1(RTM_DELETE, &info, &saved_nrt); 391 if (error == 0) { 392 RT_LOCK(saved_nrt); 393 rt = saved_nrt; 394 goto report; 395 } 396 break; 397 398 case RTM_GET: 399 case RTM_CHANGE: 400 case RTM_LOCK: 401 rnh = rt_tables[info.rti_info[RTAX_DST]->sa_family]; 402 if (rnh == NULL) 403 senderr(EAFNOSUPPORT); 404 RADIX_NODE_HEAD_LOCK(rnh); 405 rt = (struct rtentry *) rnh->rnh_lookup(info.rti_info[RTAX_DST], 406 info.rti_info[RTAX_NETMASK], rnh); 407 if (rt == NULL) { /* XXX looks bogus */ 408 RADIX_NODE_HEAD_UNLOCK(rnh); 409 senderr(ESRCH); 410 } 411 RT_LOCK(rt); 412 RT_ADDREF(rt); 413 RADIX_NODE_HEAD_UNLOCK(rnh); 414 415 switch(rtm->rtm_type) { 416 417 case RTM_GET: 418 report: 419 RT_LOCK_ASSERT(rt); 420 info.rti_info[RTAX_DST] = rt_key(rt); 421 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 422 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 423 info.rti_info[RTAX_GENMASK] = rt->rt_genmask; 424 if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) { 425 ifp = rt->rt_ifp; 426 if (ifp) { 427 info.rti_info[RTAX_IFP] = 428 ifaddr_byindex(ifp->if_index)->ifa_addr; 429 if (jailed(so->so_cred)) { 430 bzero(&jail, sizeof(jail)); 431 jail.sin_family = PF_INET; 432 jail.sin_len = sizeof(jail); 433 jail.sin_addr.s_addr = 434 htonl(prison_getip(so->so_cred)); 435 info.rti_info[RTAX_IFA] = 436 (struct sockaddr *)&jail; 437 } else 438 info.rti_info[RTAX_IFA] = 439 rt->rt_ifa->ifa_addr; 440 if (ifp->if_flags & IFF_POINTOPOINT) 441 info.rti_info[RTAX_BRD] = 442 rt->rt_ifa->ifa_dstaddr; 443 rtm->rtm_index = ifp->if_index; 444 } else { 445 info.rti_info[RTAX_IFP] = NULL; 446 info.rti_info[RTAX_IFA] = NULL; 447 } 448 } else if ((ifp = rt->rt_ifp) != NULL) { 449 rtm->rtm_index = ifp->if_index; 450 } 451 len = rt_msg2(rtm->rtm_type, &info, NULL, NULL); 452 if (len > rtm->rtm_msglen) { 453 struct rt_msghdr *new_rtm; 454 R_Malloc(new_rtm, struct rt_msghdr *, len); 455 if (new_rtm == NULL) { 456 RT_UNLOCK(rt); 457 senderr(ENOBUFS); 458 } 459 bcopy(rtm, new_rtm, rtm->rtm_msglen); 460 Free(rtm); rtm = new_rtm; 461 } 462 (void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm, NULL); 463 rtm->rtm_flags = rt->rt_flags; 464 rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx); 465 rtm->rtm_addrs = info.rti_addrs; 466 break; 467 468 case RTM_CHANGE: 469 /* 470 * New gateway could require new ifaddr, ifp; 471 * flags may also be different; ifp may be specified 472 * by ll sockaddr when protocol address is ambiguous 473 */ 474 if (((rt->rt_flags & RTF_GATEWAY) && 475 info.rti_info[RTAX_GATEWAY] != NULL) || 476 info.rti_info[RTAX_IFP] != NULL || 477 (info.rti_info[RTAX_IFA] != NULL && 478 !sa_equal(info.rti_info[RTAX_IFA], 479 rt->rt_ifa->ifa_addr))) { 480 if ((error = rt_getifa(&info)) != 0) { 481 RT_UNLOCK(rt); 482 senderr(error); 483 } 484 } 485 if (info.rti_info[RTAX_GATEWAY] != NULL && 486 (error = rt_setgate(rt, rt_key(rt), 487 info.rti_info[RTAX_GATEWAY])) != 0) { 488 RT_UNLOCK(rt); 489 senderr(error); 490 } 491 if ((ifa = info.rti_ifa) != NULL) { 492 struct ifaddr *oifa = rt->rt_ifa; 493 if (oifa != ifa) { 494 if (oifa) { 495 if (oifa->ifa_rtrequest) 496 oifa->ifa_rtrequest( 497 RTM_DELETE, rt, 498 &info); 499 IFAFREE(oifa); 500 } 501 IFAREF(ifa); 502 rt->rt_ifa = ifa; 503 rt->rt_ifp = info.rti_ifp; 504 } 505 } 506 rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx, 507 &rt->rt_rmx); 508 if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest) 509 rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info); 510 if (info.rti_info[RTAX_GENMASK]) 511 rt->rt_genmask = info.rti_info[RTAX_GENMASK]; 512 /* FALLTHROUGH */ 513 case RTM_LOCK: 514 /* We don't support locks anymore */ 515 break; 516 } 517 RT_UNLOCK(rt); 518 break; 519 520 default: 521 senderr(EOPNOTSUPP); 522 } 523 524 flush: 525 if (rtm) { 526 if (error) 527 rtm->rtm_errno = error; 528 else 529 rtm->rtm_flags |= RTF_DONE; 530 } 531 if (rt) /* XXX can this be true? */ 532 RTFREE(rt); 533 { 534 struct rawcb *rp = NULL; 535 /* 536 * Check to see if we don't want our own messages. 537 */ 538 if ((so->so_options & SO_USELOOPBACK) == 0) { 539 if (route_cb.any_count <= 1) { 540 if (rtm) 541 Free(rtm); 542 m_freem(m); 543 return (error); 544 } 545 /* There is another listener, so construct message */ 546 rp = sotorawcb(so); 547 } 548 if (rtm) { 549 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm); 550 if (m->m_pkthdr.len < rtm->rtm_msglen) { 551 m_freem(m); 552 m = NULL; 553 } else if (m->m_pkthdr.len > rtm->rtm_msglen) 554 m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len); 555 Free(rtm); 556 } 557 if (m) { 558 if (rp) { 559 /* 560 * XXX insure we don't get a copy by 561 * invalidating our protocol 562 */ 563 unsigned short family = rp->rcb_proto.sp_family; 564 rp->rcb_proto.sp_family = 0; 565 rt_dispatch(m, info.rti_info[RTAX_DST]); 566 rp->rcb_proto.sp_family = family; 567 } else 568 rt_dispatch(m, info.rti_info[RTAX_DST]); 569 } 570 } 571 return (error); 572 #undef sa_equal 573 } 574 575 static void 576 rt_setmetrics(u_long which, const struct rt_metrics *in, 577 struct rt_metrics_lite *out) 578 { 579 #define metric(f, e) if (which & (f)) out->e = in->e; 580 /* 581 * Only these are stored in the routing entry since introduction 582 * of tcp hostcache. The rest is ignored. 583 */ 584 metric(RTV_MTU, rmx_mtu); 585 metric(RTV_EXPIRE, rmx_expire); 586 #undef metric 587 } 588 589 static void 590 rt_getmetrics(const struct rt_metrics_lite *in, struct rt_metrics *out) 591 { 592 #define metric(e) out->e = in->e; 593 bzero(out, sizeof(*out)); 594 metric(rmx_mtu); 595 metric(rmx_expire); 596 #undef metric 597 } 598 599 /* 600 * Extract the addresses of the passed sockaddrs. 601 * Do a little sanity checking so as to avoid bad memory references. 602 * This data is derived straight from userland. 603 */ 604 static int 605 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo) 606 { 607 struct sockaddr *sa; 608 int i; 609 610 for (i = 0; i < RTAX_MAX && cp < cplim; i++) { 611 if ((rtinfo->rti_addrs & (1 << i)) == 0) 612 continue; 613 sa = (struct sockaddr *)cp; 614 /* 615 * It won't fit. 616 */ 617 if (cp + sa->sa_len > cplim) 618 return (EINVAL); 619 /* 620 * there are no more.. quit now 621 * If there are more bits, they are in error. 622 * I've seen this. route(1) can evidently generate these. 623 * This causes kernel to core dump. 624 * for compatibility, If we see this, point to a safe address. 625 */ 626 if (sa->sa_len == 0) { 627 rtinfo->rti_info[i] = &sa_zero; 628 return (0); /* should be EINVAL but for compat */ 629 } 630 /* accept it */ 631 rtinfo->rti_info[i] = sa; 632 cp += SA_SIZE(sa); 633 } 634 return (0); 635 } 636 637 static struct mbuf * 638 rt_msg1(int type, struct rt_addrinfo *rtinfo) 639 { 640 struct rt_msghdr *rtm; 641 struct mbuf *m; 642 int i; 643 struct sockaddr *sa; 644 int len, dlen; 645 646 switch (type) { 647 648 case RTM_DELADDR: 649 case RTM_NEWADDR: 650 len = sizeof(struct ifa_msghdr); 651 break; 652 653 case RTM_DELMADDR: 654 case RTM_NEWMADDR: 655 len = sizeof(struct ifma_msghdr); 656 break; 657 658 case RTM_IFINFO: 659 len = sizeof(struct if_msghdr); 660 break; 661 662 case RTM_IFANNOUNCE: 663 case RTM_IEEE80211: 664 len = sizeof(struct if_announcemsghdr); 665 break; 666 667 default: 668 len = sizeof(struct rt_msghdr); 669 } 670 if (len > MCLBYTES) 671 panic("rt_msg1"); 672 m = m_gethdr(M_DONTWAIT, MT_DATA); 673 if (m && len > MHLEN) { 674 MCLGET(m, M_DONTWAIT); 675 if ((m->m_flags & M_EXT) == 0) { 676 m_free(m); 677 m = NULL; 678 } 679 } 680 if (m == NULL) 681 return (m); 682 m->m_pkthdr.len = m->m_len = len; 683 m->m_pkthdr.rcvif = NULL; 684 rtm = mtod(m, struct rt_msghdr *); 685 bzero((caddr_t)rtm, len); 686 for (i = 0; i < RTAX_MAX; i++) { 687 if ((sa = rtinfo->rti_info[i]) == NULL) 688 continue; 689 rtinfo->rti_addrs |= (1 << i); 690 dlen = SA_SIZE(sa); 691 m_copyback(m, len, dlen, (caddr_t)sa); 692 len += dlen; 693 } 694 if (m->m_pkthdr.len != len) { 695 m_freem(m); 696 return (NULL); 697 } 698 rtm->rtm_msglen = len; 699 rtm->rtm_version = RTM_VERSION; 700 rtm->rtm_type = type; 701 return (m); 702 } 703 704 static int 705 rt_msg2(int type, struct rt_addrinfo *rtinfo, caddr_t cp, struct walkarg *w) 706 { 707 int i; 708 int len, dlen, second_time = 0; 709 caddr_t cp0; 710 711 rtinfo->rti_addrs = 0; 712 again: 713 switch (type) { 714 715 case RTM_DELADDR: 716 case RTM_NEWADDR: 717 len = sizeof(struct ifa_msghdr); 718 break; 719 720 case RTM_IFINFO: 721 len = sizeof(struct if_msghdr); 722 break; 723 724 case RTM_NEWMADDR: 725 len = sizeof(struct ifma_msghdr); 726 break; 727 728 default: 729 len = sizeof(struct rt_msghdr); 730 } 731 cp0 = cp; 732 if (cp0) 733 cp += len; 734 for (i = 0; i < RTAX_MAX; i++) { 735 struct sockaddr *sa; 736 737 if ((sa = rtinfo->rti_info[i]) == NULL) 738 continue; 739 rtinfo->rti_addrs |= (1 << i); 740 dlen = SA_SIZE(sa); 741 if (cp) { 742 bcopy((caddr_t)sa, cp, (unsigned)dlen); 743 cp += dlen; 744 } 745 len += dlen; 746 } 747 len = ALIGN(len); 748 if (cp == NULL && w != NULL && !second_time) { 749 struct walkarg *rw = w; 750 751 if (rw->w_req) { 752 if (rw->w_tmemsize < len) { 753 if (rw->w_tmem) 754 free(rw->w_tmem, M_RTABLE); 755 rw->w_tmem = (caddr_t) 756 malloc(len, M_RTABLE, M_NOWAIT); 757 if (rw->w_tmem) 758 rw->w_tmemsize = len; 759 } 760 if (rw->w_tmem) { 761 cp = rw->w_tmem; 762 second_time = 1; 763 goto again; 764 } 765 } 766 } 767 if (cp) { 768 struct rt_msghdr *rtm = (struct rt_msghdr *)cp0; 769 770 rtm->rtm_version = RTM_VERSION; 771 rtm->rtm_type = type; 772 rtm->rtm_msglen = len; 773 } 774 return (len); 775 } 776 777 /* 778 * This routine is called to generate a message from the routing 779 * socket indicating that a redirect has occured, a routing lookup 780 * has failed, or that a protocol has detected timeouts to a particular 781 * destination. 782 */ 783 void 784 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error) 785 { 786 struct rt_msghdr *rtm; 787 struct mbuf *m; 788 struct sockaddr *sa = rtinfo->rti_info[RTAX_DST]; 789 790 if (route_cb.any_count == 0) 791 return; 792 m = rt_msg1(type, rtinfo); 793 if (m == NULL) 794 return; 795 rtm = mtod(m, struct rt_msghdr *); 796 rtm->rtm_flags = RTF_DONE | flags; 797 rtm->rtm_errno = error; 798 rtm->rtm_addrs = rtinfo->rti_addrs; 799 rt_dispatch(m, sa); 800 } 801 802 /* 803 * This routine is called to generate a message from the routing 804 * socket indicating that the status of a network interface has changed. 805 */ 806 void 807 rt_ifmsg(struct ifnet *ifp) 808 { 809 struct if_msghdr *ifm; 810 struct mbuf *m; 811 struct rt_addrinfo info; 812 813 if (route_cb.any_count == 0) 814 return; 815 bzero((caddr_t)&info, sizeof(info)); 816 m = rt_msg1(RTM_IFINFO, &info); 817 if (m == NULL) 818 return; 819 ifm = mtod(m, struct if_msghdr *); 820 ifm->ifm_index = ifp->if_index; 821 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags; 822 ifm->ifm_data = ifp->if_data; 823 ifm->ifm_addrs = 0; 824 rt_dispatch(m, NULL); 825 } 826 827 /* 828 * This is called to generate messages from the routing socket 829 * indicating a network interface has had addresses associated with it. 830 * if we ever reverse the logic and replace messages TO the routing 831 * socket indicate a request to configure interfaces, then it will 832 * be unnecessary as the routing socket will automatically generate 833 * copies of it. 834 */ 835 void 836 rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt) 837 { 838 struct rt_addrinfo info; 839 struct sockaddr *sa = NULL; 840 int pass; 841 struct mbuf *m = NULL; 842 struct ifnet *ifp = ifa->ifa_ifp; 843 844 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 845 ("unexpected cmd %u", cmd)); 846 847 if (route_cb.any_count == 0) 848 return; 849 for (pass = 1; pass < 3; pass++) { 850 bzero((caddr_t)&info, sizeof(info)); 851 if ((cmd == RTM_ADD && pass == 1) || 852 (cmd == RTM_DELETE && pass == 2)) { 853 struct ifa_msghdr *ifam; 854 int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR; 855 856 info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr; 857 info.rti_info[RTAX_IFP] = 858 ifaddr_byindex(ifp->if_index)->ifa_addr; 859 info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask; 860 info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr; 861 if ((m = rt_msg1(ncmd, &info)) == NULL) 862 continue; 863 ifam = mtod(m, struct ifa_msghdr *); 864 ifam->ifam_index = ifp->if_index; 865 ifam->ifam_metric = ifa->ifa_metric; 866 ifam->ifam_flags = ifa->ifa_flags; 867 ifam->ifam_addrs = info.rti_addrs; 868 } 869 if ((cmd == RTM_ADD && pass == 2) || 870 (cmd == RTM_DELETE && pass == 1)) { 871 struct rt_msghdr *rtm; 872 873 if (rt == NULL) 874 continue; 875 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 876 info.rti_info[RTAX_DST] = sa = rt_key(rt); 877 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 878 if ((m = rt_msg1(cmd, &info)) == NULL) 879 continue; 880 rtm = mtod(m, struct rt_msghdr *); 881 rtm->rtm_index = ifp->if_index; 882 rtm->rtm_flags |= rt->rt_flags; 883 rtm->rtm_errno = error; 884 rtm->rtm_addrs = info.rti_addrs; 885 } 886 rt_dispatch(m, sa); 887 } 888 } 889 890 /* 891 * This is the analogue to the rt_newaddrmsg which performs the same 892 * function but for multicast group memberhips. This is easier since 893 * there is no route state to worry about. 894 */ 895 void 896 rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma) 897 { 898 struct rt_addrinfo info; 899 struct mbuf *m = NULL; 900 struct ifnet *ifp = ifma->ifma_ifp; 901 struct ifma_msghdr *ifmam; 902 903 if (route_cb.any_count == 0) 904 return; 905 906 bzero((caddr_t)&info, sizeof(info)); 907 info.rti_info[RTAX_IFA] = ifma->ifma_addr; 908 info.rti_info[RTAX_IFP] = 909 ifp ? ifaddr_byindex(ifp->if_index)->ifa_addr : NULL; 910 /* 911 * If a link-layer address is present, present it as a ``gateway'' 912 * (similarly to how ARP entries, e.g., are presented). 913 */ 914 info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr; 915 m = rt_msg1(cmd, &info); 916 if (m == NULL) 917 return; 918 ifmam = mtod(m, struct ifma_msghdr *); 919 ifmam->ifmam_index = ifp->if_index; 920 ifmam->ifmam_addrs = info.rti_addrs; 921 rt_dispatch(m, ifma->ifma_addr); 922 } 923 924 static struct mbuf * 925 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what, 926 struct rt_addrinfo *info) 927 { 928 struct if_announcemsghdr *ifan; 929 struct mbuf *m; 930 931 if (route_cb.any_count == 0) 932 return NULL; 933 bzero((caddr_t)info, sizeof(*info)); 934 m = rt_msg1(type, info); 935 if (m != NULL) { 936 ifan = mtod(m, struct if_announcemsghdr *); 937 ifan->ifan_index = ifp->if_index; 938 strlcpy(ifan->ifan_name, ifp->if_xname, 939 sizeof(ifan->ifan_name)); 940 ifan->ifan_what = what; 941 } 942 return m; 943 } 944 945 /* 946 * This is called to generate routing socket messages indicating 947 * IEEE80211 wireless events. 948 * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way. 949 */ 950 void 951 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len) 952 { 953 struct mbuf *m; 954 struct rt_addrinfo info; 955 956 m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info); 957 if (m != NULL) { 958 /* 959 * Append the ieee80211 data. Try to stick it in the 960 * mbuf containing the ifannounce msg; otherwise allocate 961 * a new mbuf and append. 962 * 963 * NB: we assume m is a single mbuf. 964 */ 965 if (data_len > M_TRAILINGSPACE(m)) { 966 struct mbuf *n = m_get(M_NOWAIT, MT_DATA); 967 if (n == NULL) { 968 m_freem(m); 969 return; 970 } 971 bcopy(data, mtod(n, void *), data_len); 972 n->m_len = data_len; 973 m->m_next = n; 974 } else if (data_len > 0) { 975 bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len); 976 m->m_len += data_len; 977 } 978 if (m->m_flags & M_PKTHDR) 979 m->m_pkthdr.len += data_len; 980 mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len; 981 rt_dispatch(m, NULL); 982 } 983 } 984 985 /* 986 * This is called to generate routing socket messages indicating 987 * network interface arrival and departure. 988 */ 989 void 990 rt_ifannouncemsg(struct ifnet *ifp, int what) 991 { 992 struct mbuf *m; 993 struct rt_addrinfo info; 994 995 m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info); 996 if (m != NULL) 997 rt_dispatch(m, NULL); 998 } 999 1000 static void 1001 rt_dispatch(struct mbuf *m, const struct sockaddr *sa) 1002 { 1003 struct m_tag *tag; 1004 1005 /* 1006 * Preserve the family from the sockaddr, if any, in an m_tag for 1007 * use when injecting the mbuf into the routing socket buffer from 1008 * the netisr. 1009 */ 1010 if (sa != NULL) { 1011 tag = m_tag_get(PACKET_TAG_RTSOCKFAM, sizeof(unsigned short), 1012 M_NOWAIT); 1013 if (tag == NULL) { 1014 m_freem(m); 1015 return; 1016 } 1017 *(unsigned short *)(tag + 1) = sa->sa_family; 1018 m_tag_prepend(m, tag); 1019 } 1020 netisr_queue(NETISR_ROUTE, m); /* mbuf is free'd on failure. */ 1021 } 1022 1023 /* 1024 * This is used in dumping the kernel table via sysctl(). 1025 */ 1026 static int 1027 sysctl_dumpentry(struct radix_node *rn, void *vw) 1028 { 1029 struct walkarg *w = vw; 1030 struct rtentry *rt = (struct rtentry *)rn; 1031 int error = 0, size; 1032 struct rt_addrinfo info; 1033 1034 if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg)) 1035 return 0; 1036 bzero((caddr_t)&info, sizeof(info)); 1037 info.rti_info[RTAX_DST] = rt_key(rt); 1038 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 1039 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 1040 info.rti_info[RTAX_GENMASK] = rt->rt_genmask; 1041 if (rt->rt_ifp) { 1042 info.rti_info[RTAX_IFP] = 1043 ifaddr_byindex(rt->rt_ifp->if_index)->ifa_addr; 1044 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 1045 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT) 1046 info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr; 1047 } 1048 size = rt_msg2(RTM_GET, &info, NULL, w); 1049 if (w->w_req && w->w_tmem) { 1050 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem; 1051 1052 rtm->rtm_flags = rt->rt_flags; 1053 rtm->rtm_use = rt->rt_rmx.rmx_pksent; 1054 rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx); 1055 rtm->rtm_index = rt->rt_ifp->if_index; 1056 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0; 1057 rtm->rtm_addrs = info.rti_addrs; 1058 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size); 1059 return (error); 1060 } 1061 return (error); 1062 } 1063 1064 static int 1065 sysctl_iflist(int af, struct walkarg *w) 1066 { 1067 struct ifnet *ifp; 1068 struct ifaddr *ifa; 1069 struct rt_addrinfo info; 1070 int len, error = 0; 1071 1072 bzero((caddr_t)&info, sizeof(info)); 1073 IFNET_RLOCK(); 1074 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1075 if (w->w_arg && w->w_arg != ifp->if_index) 1076 continue; 1077 ifa = ifaddr_byindex(ifp->if_index); 1078 info.rti_info[RTAX_IFP] = ifa->ifa_addr; 1079 len = rt_msg2(RTM_IFINFO, &info, NULL, w); 1080 info.rti_info[RTAX_IFP] = NULL; 1081 if (w->w_req && w->w_tmem) { 1082 struct if_msghdr *ifm; 1083 1084 ifm = (struct if_msghdr *)w->w_tmem; 1085 ifm->ifm_index = ifp->if_index; 1086 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags; 1087 ifm->ifm_data = ifp->if_data; 1088 ifm->ifm_addrs = info.rti_addrs; 1089 error = SYSCTL_OUT(w->w_req,(caddr_t)ifm, len); 1090 if (error) 1091 goto done; 1092 } 1093 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != NULL) { 1094 if (af && af != ifa->ifa_addr->sa_family) 1095 continue; 1096 if (jailed(curthread->td_ucred) && 1097 prison_if(curthread->td_ucred, ifa->ifa_addr)) 1098 continue; 1099 info.rti_info[RTAX_IFA] = ifa->ifa_addr; 1100 info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask; 1101 info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr; 1102 len = rt_msg2(RTM_NEWADDR, &info, NULL, w); 1103 if (w->w_req && w->w_tmem) { 1104 struct ifa_msghdr *ifam; 1105 1106 ifam = (struct ifa_msghdr *)w->w_tmem; 1107 ifam->ifam_index = ifa->ifa_ifp->if_index; 1108 ifam->ifam_flags = ifa->ifa_flags; 1109 ifam->ifam_metric = ifa->ifa_metric; 1110 ifam->ifam_addrs = info.rti_addrs; 1111 error = SYSCTL_OUT(w->w_req, w->w_tmem, len); 1112 if (error) 1113 goto done; 1114 } 1115 } 1116 info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] = 1117 info.rti_info[RTAX_BRD] = NULL; 1118 } 1119 done: 1120 IFNET_RUNLOCK(); 1121 return (error); 1122 } 1123 1124 int 1125 sysctl_ifmalist(int af, struct walkarg *w) 1126 { 1127 struct ifnet *ifp; 1128 struct ifmultiaddr *ifma; 1129 struct rt_addrinfo info; 1130 int len, error = 0; 1131 struct ifaddr *ifa; 1132 1133 bzero((caddr_t)&info, sizeof(info)); 1134 IFNET_RLOCK(); 1135 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1136 if (w->w_arg && w->w_arg != ifp->if_index) 1137 continue; 1138 ifa = ifaddr_byindex(ifp->if_index); 1139 info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL; 1140 IF_ADDR_LOCK(ifp); 1141 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1142 if (af && af != ifma->ifma_addr->sa_family) 1143 continue; 1144 if (jailed(curproc->p_ucred) && 1145 prison_if(curproc->p_ucred, ifma->ifma_addr)) 1146 continue; 1147 info.rti_info[RTAX_IFA] = ifma->ifma_addr; 1148 info.rti_info[RTAX_GATEWAY] = 1149 (ifma->ifma_addr->sa_family != AF_LINK) ? 1150 ifma->ifma_lladdr : NULL; 1151 len = rt_msg2(RTM_NEWMADDR, &info, NULL, w); 1152 if (w->w_req && w->w_tmem) { 1153 struct ifma_msghdr *ifmam; 1154 1155 ifmam = (struct ifma_msghdr *)w->w_tmem; 1156 ifmam->ifmam_index = ifma->ifma_ifp->if_index; 1157 ifmam->ifmam_flags = 0; 1158 ifmam->ifmam_addrs = info.rti_addrs; 1159 error = SYSCTL_OUT(w->w_req, w->w_tmem, len); 1160 if (error) { 1161 IF_ADDR_UNLOCK(ifp); 1162 goto done; 1163 } 1164 } 1165 } 1166 IF_ADDR_UNLOCK(ifp); 1167 } 1168 done: 1169 IFNET_RUNLOCK(); 1170 return (error); 1171 } 1172 1173 static int 1174 sysctl_rtsock(SYSCTL_HANDLER_ARGS) 1175 { 1176 int *name = (int *)arg1; 1177 u_int namelen = arg2; 1178 struct radix_node_head *rnh; 1179 int i, lim, error = EINVAL; 1180 u_char af; 1181 struct walkarg w; 1182 1183 name ++; 1184 namelen--; 1185 if (req->newptr) 1186 return (EPERM); 1187 if (namelen != 3) 1188 return ((namelen < 3) ? EISDIR : ENOTDIR); 1189 af = name[0]; 1190 if (af > AF_MAX) 1191 return (EINVAL); 1192 bzero(&w, sizeof(w)); 1193 w.w_op = name[1]; 1194 w.w_arg = name[2]; 1195 w.w_req = req; 1196 1197 error = sysctl_wire_old_buffer(req, 0); 1198 if (error) 1199 return (error); 1200 switch (w.w_op) { 1201 1202 case NET_RT_DUMP: 1203 case NET_RT_FLAGS: 1204 if (af == 0) { /* dump all tables */ 1205 i = 1; 1206 lim = AF_MAX; 1207 } else /* dump only one table */ 1208 i = lim = af; 1209 for (error = 0; error == 0 && i <= lim; i++) 1210 if ((rnh = rt_tables[i]) != NULL) { 1211 RADIX_NODE_HEAD_LOCK(rnh); 1212 error = rnh->rnh_walktree(rnh, 1213 sysctl_dumpentry, &w); 1214 RADIX_NODE_HEAD_UNLOCK(rnh); 1215 } else if (af != 0) 1216 error = EAFNOSUPPORT; 1217 break; 1218 1219 case NET_RT_IFLIST: 1220 error = sysctl_iflist(af, &w); 1221 break; 1222 1223 case NET_RT_IFMALIST: 1224 error = sysctl_ifmalist(af, &w); 1225 break; 1226 } 1227 if (w.w_tmem) 1228 free(w.w_tmem, M_RTABLE); 1229 return (error); 1230 } 1231 1232 SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, ""); 1233 1234 /* 1235 * Definitions of protocols supported in the ROUTE domain. 1236 */ 1237 1238 extern struct domain routedomain; /* or at least forward */ 1239 1240 static struct protosw routesw[] = { 1241 { SOCK_RAW, &routedomain, 0, PR_ATOMIC|PR_ADDR, 1242 0, route_output, raw_ctlinput, 0, 1243 0, 1244 raw_init, 0, 0, 0, 1245 &route_usrreqs 1246 } 1247 }; 1248 1249 static struct domain routedomain = 1250 { PF_ROUTE, "route", 0, 0, 0, 1251 routesw, &routesw[sizeof(routesw)/sizeof(routesw[0])] }; 1252 1253 DOMAIN_SET(route);
Cache object: feb147f5c39b4d94badddbd935e6fe5a
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