rtsock.c revision 1.90
1 /* $NetBSD: rtsock.c,v 1.90 2006/11/13 05:13:41 dyoung Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1988, 1991, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)rtsock.c 8.7 (Berkeley) 10/12/95 61 */ 62 63 #include <sys/cdefs.h> 64 __KERNEL_RCSID(0, "$NetBSD: rtsock.c,v 1.90 2006/11/13 05:13:41 dyoung Exp $"); 65 66 #include "opt_inet.h" 67 68 #include <sys/param.h> 69 #include <sys/systm.h> 70 #include <sys/proc.h> 71 #include <sys/mbuf.h> 72 #include <sys/socket.h> 73 #include <sys/socketvar.h> 74 #include <sys/domain.h> 75 #include <sys/protosw.h> 76 #include <sys/sysctl.h> 77 #include <sys/kauth.h> 78 79 #include <net/if.h> 80 #include <net/route.h> 81 #include <net/raw_cb.h> 82 83 #include <machine/stdarg.h> 84 85 DOMAIN_DEFINE(routedomain); /* forward declare and add to link set */ 86 87 struct sockaddr route_dst = { .sa_len = 2, .sa_family = PF_ROUTE, }; 88 struct sockaddr route_src = { .sa_len = 2, .sa_family = PF_ROUTE, }; 89 struct sockproto route_proto = { .sp_family = PF_ROUTE, }; 90 91 struct walkarg { 92 int w_op; 93 int w_arg; 94 int w_given; 95 int w_needed; 96 caddr_t w_where; 97 int w_tmemsize; 98 int w_tmemneeded; 99 caddr_t w_tmem; 100 }; 101 102 static struct mbuf *rt_msg1(int, struct rt_addrinfo *, caddr_t, int); 103 static int rt_msg2(int, struct rt_addrinfo *, caddr_t, struct walkarg *, int *); 104 static int rt_xaddrs(u_char, const char *, const char *, struct rt_addrinfo *); 105 static struct mbuf *rt_makeifannouncemsg(struct ifnet *, int, int, 106 struct rt_addrinfo *); 107 static int sysctl_dumpentry(struct radix_node *, void *); 108 static int sysctl_iflist(int, struct walkarg *, int); 109 static int sysctl_rtable(SYSCTLFN_PROTO); 110 static inline void rt_adjustcount(int, int); 111 112 /* Sleazy use of local variables throughout file, warning!!!! */ 113 #define dst info.rti_info[RTAX_DST] 114 #define gate info.rti_info[RTAX_GATEWAY] 115 #define netmask info.rti_info[RTAX_NETMASK] 116 #define genmask info.rti_info[RTAX_GENMASK] 117 #define ifpaddr info.rti_info[RTAX_IFP] 118 #define ifaaddr info.rti_info[RTAX_IFA] 119 #define brdaddr info.rti_info[RTAX_BRD] 120 121 static inline void 122 rt_adjustcount(int af, int cnt) 123 { 124 route_cb.any_count += cnt; 125 switch (af) { 126 case AF_INET: 127 route_cb.ip_count += cnt; 128 return; 129 #ifdef INET6 130 case AF_INET6: 131 route_cb.ip6_count += cnt; 132 return; 133 #endif 134 case AF_IPX: 135 route_cb.ipx_count += cnt; 136 return; 137 case AF_NS: 138 route_cb.ns_count += cnt; 139 return; 140 case AF_ISO: 141 route_cb.iso_count += cnt; 142 return; 143 } 144 } 145 146 /*ARGSUSED*/ 147 int 148 route_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, 149 struct mbuf *control, struct lwp *l) 150 { 151 int error = 0; 152 struct rawcb *rp = sotorawcb(so); 153 int s; 154 155 if (req == PRU_ATTACH) { 156 MALLOC(rp, struct rawcb *, sizeof(*rp), M_PCB, M_WAITOK); 157 if ((so->so_pcb = rp) != NULL) 158 memset(so->so_pcb, 0, sizeof(*rp)); 159 160 } 161 if (req == PRU_DETACH && rp) 162 rt_adjustcount(rp->rcb_proto.sp_protocol, -1); 163 s = splsoftnet(); 164 165 /* 166 * Don't call raw_usrreq() in the attach case, because 167 * we want to allow non-privileged processes to listen on 168 * and send "safe" commands to the routing socket. 169 */ 170 if (req == PRU_ATTACH) { 171 if (l == 0) 172 error = EACCES; 173 else 174 error = raw_attach(so, (int)(long)nam); 175 } else 176 error = raw_usrreq(so, req, m, nam, control, l); 177 178 rp = sotorawcb(so); 179 if (req == PRU_ATTACH && rp) { 180 if (error) { 181 free((caddr_t)rp, M_PCB); 182 splx(s); 183 return (error); 184 } 185 rt_adjustcount(rp->rcb_proto.sp_protocol, 1); 186 rp->rcb_laddr = &route_src; 187 rp->rcb_faddr = &route_dst; 188 soisconnected(so); 189 so->so_options |= SO_USELOOPBACK; 190 } 191 splx(s); 192 return (error); 193 } 194 195 /*ARGSUSED*/ 196 int 197 route_output(struct mbuf *m, ...) 198 { 199 struct rt_msghdr *rtm = 0; 200 struct radix_node *rn = 0; 201 struct rtentry *rt = 0; 202 struct rtentry *saved_nrt = 0; 203 struct radix_node_head *rnh; 204 struct rt_addrinfo info; 205 int len, error = 0; 206 struct ifnet *ifp = 0; 207 struct ifaddr *ifa = 0; 208 struct socket *so; 209 va_list ap; 210 sa_family_t family; 211 212 va_start(ap, m); 213 so = va_arg(ap, struct socket *); 214 va_end(ap); 215 216 #define senderr(e) do { error = e; goto flush;} while (/*CONSTCOND*/ 0) 217 if (m == 0 || ((m->m_len < sizeof(int32_t)) && 218 (m = m_pullup(m, sizeof(int32_t))) == 0)) 219 return (ENOBUFS); 220 if ((m->m_flags & M_PKTHDR) == 0) 221 panic("route_output"); 222 len = m->m_pkthdr.len; 223 if (len < sizeof(*rtm) || 224 len != mtod(m, struct rt_msghdr *)->rtm_msglen) { 225 dst = 0; 226 senderr(EINVAL); 227 } 228 R_Malloc(rtm, struct rt_msghdr *, len); 229 if (rtm == 0) { 230 dst = 0; 231 senderr(ENOBUFS); 232 } 233 m_copydata(m, 0, len, (caddr_t)rtm); 234 if (rtm->rtm_version != RTM_VERSION) { 235 dst = 0; 236 senderr(EPROTONOSUPPORT); 237 } 238 rtm->rtm_pid = curproc->p_pid; 239 memset(&info, 0, sizeof(info)); 240 info.rti_addrs = rtm->rtm_addrs; 241 if (rt_xaddrs(rtm->rtm_type, (caddr_t)(rtm + 1), len + (caddr_t)rtm, &info)) 242 senderr(EINVAL); 243 info.rti_flags = rtm->rtm_flags; 244 if (dst == 0 || (dst->sa_family >= AF_MAX)) 245 senderr(EINVAL); 246 if (gate != 0 && (gate->sa_family >= AF_MAX)) 247 senderr(EINVAL); 248 if (genmask) { 249 struct radix_node *t; 250 t = rn_addmask(genmask, 0, 1); 251 if (t && genmask->sa_len >= ((const struct sockaddr *)t->rn_key)->sa_len && 252 Bcmp((const char *const *)genmask + 1, (const char *const *)t->rn_key + 1, 253 ((const struct sockaddr *)t->rn_key)->sa_len) - 1) 254 genmask = (const struct sockaddr *)(t->rn_key); 255 else 256 senderr(ENOBUFS); 257 } 258 259 /* 260 * Verify that the caller has the appropriate privilege; RTM_GET 261 * is the only operation the non-superuser is allowed. 262 */ 263 if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_ROUTE, 264 0, rtm, NULL, NULL) != 0) 265 senderr(EACCES); 266 267 switch (rtm->rtm_type) { 268 269 case RTM_ADD: 270 if (gate == 0) 271 senderr(EINVAL); 272 error = rtrequest1(rtm->rtm_type, &info, &saved_nrt); 273 if (error == 0 && saved_nrt) { 274 rt_setmetrics(rtm->rtm_inits, 275 &rtm->rtm_rmx, &saved_nrt->rt_rmx); 276 saved_nrt->rt_refcnt--; 277 saved_nrt->rt_genmask = genmask; 278 } 279 break; 280 281 case RTM_DELETE: 282 error = rtrequest1(rtm->rtm_type, &info, &saved_nrt); 283 if (error == 0) { 284 (rt = saved_nrt)->rt_refcnt++; 285 goto report; 286 } 287 break; 288 289 case RTM_GET: 290 case RTM_CHANGE: 291 case RTM_LOCK: 292 if ((rnh = rt_tables[dst->sa_family]) == 0) { 293 senderr(EAFNOSUPPORT); 294 } 295 rn = rnh->rnh_lookup(dst, netmask, rnh); 296 if (rn == NULL || (rn->rn_flags & RNF_ROOT) != 0) { 297 senderr(ESRCH); 298 } 299 rt = (struct rtentry *)rn; 300 rt->rt_refcnt++; 301 if (rtm->rtm_type != RTM_GET) {/* XXX: too grotty */ 302 struct radix_node *rnn; 303 extern struct radix_node_head *mask_rnhead; 304 305 if (Bcmp(dst, rt_key(rt), dst->sa_len) != 0) 306 senderr(ESRCH); 307 if (netmask && (rnn = rn_search(netmask, 308 mask_rnhead->rnh_treetop))) 309 netmask = (const struct sockaddr *)rnn->rn_key; 310 for (rnn = rt->rt_nodes; rnn; rnn = rnn->rn_dupedkey) 311 if (netmask == (const struct sockaddr *)rnn->rn_mask) 312 break; 313 if (rnn == 0) 314 senderr(ETOOMANYREFS); 315 rt = (struct rtentry *)rnn; 316 } 317 318 switch (rtm->rtm_type) { 319 case RTM_GET: 320 report: 321 dst = rt_key(rt); 322 gate = rt->rt_gateway; 323 netmask = rt_mask(rt); 324 genmask = rt->rt_genmask; 325 if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) { 326 if ((ifp = rt->rt_ifp) != NULL) { 327 ifpaddr = TAILQ_FIRST(&ifp->if_addrlist)->ifa_addr; 328 ifaaddr = rt->rt_ifa->ifa_addr; 329 if (ifp->if_flags & IFF_POINTOPOINT) 330 brdaddr = rt->rt_ifa->ifa_dstaddr; 331 else 332 brdaddr = 0; 333 rtm->rtm_index = ifp->if_index; 334 } else { 335 ifpaddr = 0; 336 ifaaddr = 0; 337 } 338 } 339 (void)rt_msg2(rtm->rtm_type, &info, (caddr_t)0, 340 (struct walkarg *)0, &len); 341 if (len > rtm->rtm_msglen) { 342 struct rt_msghdr *new_rtm; 343 R_Malloc(new_rtm, struct rt_msghdr *, len); 344 if (new_rtm == 0) 345 senderr(ENOBUFS); 346 Bcopy(rtm, new_rtm, rtm->rtm_msglen); 347 Free(rtm); rtm = new_rtm; 348 } 349 (void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm, 350 (struct walkarg *)0, 0); 351 rtm->rtm_flags = rt->rt_flags; 352 rtm->rtm_rmx = rt->rt_rmx; 353 rtm->rtm_addrs = info.rti_addrs; 354 break; 355 356 case RTM_CHANGE: 357 /* 358 * new gateway could require new ifaddr, ifp; 359 * flags may also be different; ifp may be specified 360 * by ll sockaddr when protocol address is ambiguous 361 */ 362 if ((error = rt_getifa(&info)) != 0) 363 senderr(error); 364 if (gate && rt_setgate(rt, rt_key(rt), gate)) 365 senderr(EDQUOT); 366 /* new gateway could require new ifaddr, ifp; 367 flags may also be different; ifp may be specified 368 by ll sockaddr when protocol address is ambiguous */ 369 if (ifpaddr && (ifa = ifa_ifwithnet(ifpaddr)) && 370 (ifp = ifa->ifa_ifp) && (ifaaddr || gate)) 371 ifa = ifaof_ifpforaddr(ifaaddr ? ifaaddr : gate, 372 ifp); 373 else if ((ifaaddr && (ifa = ifa_ifwithaddr(ifaaddr))) || 374 (gate && (ifa = ifa_ifwithroute(rt->rt_flags, 375 rt_key(rt), gate)))) 376 ifp = ifa->ifa_ifp; 377 if (ifa) { 378 struct ifaddr *oifa = rt->rt_ifa; 379 if (oifa != ifa) { 380 if (oifa && oifa->ifa_rtrequest) { 381 oifa->ifa_rtrequest(RTM_DELETE, 382 rt, &info); 383 } 384 rt_replace_ifa(rt, ifa); 385 rt->rt_ifp = ifp; 386 } 387 } 388 rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx, 389 &rt->rt_rmx); 390 if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest) 391 rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info); 392 if (genmask) 393 rt->rt_genmask = genmask; 394 /* 395 * Fall into 396 */ 397 case RTM_LOCK: 398 rt->rt_rmx.rmx_locks &= ~(rtm->rtm_inits); 399 rt->rt_rmx.rmx_locks |= 400 (rtm->rtm_inits & rtm->rtm_rmx.rmx_locks); 401 break; 402 } 403 break; 404 405 default: 406 senderr(EOPNOTSUPP); 407 } 408 409 flush: 410 if (rtm) { 411 if (error) 412 rtm->rtm_errno = error; 413 else 414 rtm->rtm_flags |= RTF_DONE; 415 } 416 family = dst ? dst->sa_family : 0; 417 if (rt) 418 rtfree(rt); 419 { 420 struct rawcb *rp = 0; 421 /* 422 * Check to see if we don't want our own messages. 423 */ 424 if ((so->so_options & SO_USELOOPBACK) == 0) { 425 if (route_cb.any_count <= 1) { 426 if (rtm) 427 Free(rtm); 428 m_freem(m); 429 return (error); 430 } 431 /* There is another listener, so construct message */ 432 rp = sotorawcb(so); 433 } 434 if (rtm) { 435 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm); 436 if (m->m_pkthdr.len < rtm->rtm_msglen) { 437 m_freem(m); 438 m = NULL; 439 } else if (m->m_pkthdr.len > rtm->rtm_msglen) 440 m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len); 441 Free(rtm); 442 } 443 if (rp) 444 rp->rcb_proto.sp_family = 0; /* Avoid us */ 445 if (family) 446 route_proto.sp_protocol = family; 447 if (m) 448 raw_input(m, &route_proto, &route_src, &route_dst); 449 if (rp) 450 rp->rcb_proto.sp_family = PF_ROUTE; 451 } 452 return (error); 453 } 454 455 void 456 rt_setmetrics(u_long which, const struct rt_metrics *in, struct rt_metrics *out) 457 { 458 #define metric(f, e) if (which & (f)) out->e = in->e; 459 metric(RTV_RPIPE, rmx_recvpipe); 460 metric(RTV_SPIPE, rmx_sendpipe); 461 metric(RTV_SSTHRESH, rmx_ssthresh); 462 metric(RTV_RTT, rmx_rtt); 463 metric(RTV_RTTVAR, rmx_rttvar); 464 metric(RTV_HOPCOUNT, rmx_hopcount); 465 metric(RTV_MTU, rmx_mtu); 466 metric(RTV_EXPIRE, rmx_expire); 467 #undef metric 468 } 469 470 #define ROUNDUP(a) \ 471 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 472 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 473 474 static int 475 rt_xaddrs(u_char rtmtype, const char *cp, const char *cplim, struct rt_addrinfo *rtinfo) 476 { 477 const struct sockaddr *sa = NULL; /* Quell compiler warning */ 478 int i; 479 480 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 481 if ((rtinfo->rti_addrs & (1 << i)) == 0) 482 continue; 483 rtinfo->rti_info[i] = sa = (const struct sockaddr *)cp; 484 ADVANCE(cp, sa); 485 } 486 487 /* Check for extra addresses specified, except RTM_GET asking for interface info. */ 488 if (rtmtype == RTM_GET) { 489 if (((rtinfo->rti_addrs & (~((1 << RTAX_IFP) | (1 << RTAX_IFA)))) & (~0 << i)) != 0) 490 return (1); 491 } else { 492 if ((rtinfo->rti_addrs & (~0 << i)) != 0) 493 return (1); 494 } 495 /* Check for bad data length. */ 496 if (cp != cplim) { 497 if (i == RTAX_NETMASK + 1 && sa && 498 cp - ROUNDUP(sa->sa_len) + sa->sa_len == cplim) 499 /* 500 * The last sockaddr was netmask. 501 * We accept this for now for the sake of old 502 * binaries or third party softwares. 503 */ 504 ; 505 else 506 return (1); 507 } 508 return (0); 509 } 510 511 static struct mbuf * 512 rt_msg1(int type, struct rt_addrinfo *rtinfo, caddr_t data, int datalen) 513 { 514 struct rt_msghdr *rtm; 515 struct mbuf *m; 516 int i; 517 const struct sockaddr *sa; 518 int len, dlen; 519 520 m = m_gethdr(M_DONTWAIT, MT_DATA); 521 if (m == 0) 522 return (m); 523 MCLAIM(m, &routedomain.dom_mowner); 524 switch (type) { 525 526 case RTM_DELADDR: 527 case RTM_NEWADDR: 528 len = sizeof(struct ifa_msghdr); 529 break; 530 531 #ifdef COMPAT_14 532 case RTM_OIFINFO: 533 len = sizeof(struct if_msghdr14); 534 break; 535 #endif 536 537 case RTM_IFINFO: 538 len = sizeof(struct if_msghdr); 539 break; 540 541 case RTM_IFANNOUNCE: 542 case RTM_IEEE80211: 543 len = sizeof(struct if_announcemsghdr); 544 break; 545 546 default: 547 len = sizeof(struct rt_msghdr); 548 } 549 if (len > MHLEN + MLEN) 550 panic("rt_msg1: message too long"); 551 else if (len > MHLEN) { 552 m->m_next = m_get(M_DONTWAIT, MT_DATA); 553 if (m->m_next == NULL) { 554 m_freem(m); 555 return (NULL); 556 } 557 MCLAIM(m->m_next, m->m_owner); 558 m->m_pkthdr.len = len; 559 m->m_len = MHLEN; 560 m->m_next->m_len = len - MHLEN; 561 } else { 562 m->m_pkthdr.len = m->m_len = len; 563 } 564 m->m_pkthdr.rcvif = 0; 565 m_copyback(m, 0, datalen, data); 566 rtm = mtod(m, struct rt_msghdr *); 567 for (i = 0; i < RTAX_MAX; i++) { 568 if ((sa = rtinfo->rti_info[i]) == NULL) 569 continue; 570 rtinfo->rti_addrs |= (1 << i); 571 dlen = ROUNDUP(sa->sa_len); 572 m_copyback(m, len, dlen, sa); 573 len += dlen; 574 } 575 if (m->m_pkthdr.len != len) { 576 m_freem(m); 577 return (NULL); 578 } 579 rtm->rtm_msglen = len; 580 rtm->rtm_version = RTM_VERSION; 581 rtm->rtm_type = type; 582 return (m); 583 } 584 585 /* 586 * rt_msg2 587 * 588 * fills 'cp' or 'w'.w_tmem with the routing socket message and 589 * returns the length of the message in 'lenp'. 590 * 591 * if walkarg is 0, cp is expected to be 0 or a buffer large enough to hold 592 * the message 593 * otherwise walkarg's w_needed is updated and if the user buffer is 594 * specified and w_needed indicates space exists the information is copied 595 * into the temp space (w_tmem). w_tmem is [re]allocated if necessary, 596 * if the allocation fails ENOBUFS is returned. 597 */ 598 static int 599 rt_msg2(int type, struct rt_addrinfo *rtinfo, caddr_t cp, struct walkarg *w, 600 int *lenp) 601 { 602 int i; 603 int len, dlen, second_time = 0; 604 caddr_t cp0; 605 606 rtinfo->rti_addrs = 0; 607 again: 608 switch (type) { 609 610 case RTM_DELADDR: 611 case RTM_NEWADDR: 612 len = sizeof(struct ifa_msghdr); 613 break; 614 #ifdef COMPAT_14 615 case RTM_OIFINFO: 616 len = sizeof(struct if_msghdr14); 617 break; 618 #endif 619 620 case RTM_IFINFO: 621 len = sizeof(struct if_msghdr); 622 break; 623 624 default: 625 len = sizeof(struct rt_msghdr); 626 } 627 if ((cp0 = cp) != NULL) 628 cp += len; 629 for (i = 0; i < RTAX_MAX; i++) { 630 const struct sockaddr *sa; 631 632 if ((sa = rtinfo->rti_info[i]) == 0) 633 continue; 634 rtinfo->rti_addrs |= (1 << i); 635 dlen = ROUNDUP(sa->sa_len); 636 if (cp) { 637 bcopy(sa, cp, (unsigned)dlen); 638 cp += dlen; 639 } 640 len += dlen; 641 } 642 if (cp == 0 && w != NULL && !second_time) { 643 struct walkarg *rw = w; 644 645 rw->w_needed += len; 646 if (rw->w_needed <= 0 && rw->w_where) { 647 if (rw->w_tmemsize < len) { 648 if (rw->w_tmem) 649 free(rw->w_tmem, M_RTABLE); 650 rw->w_tmem = (caddr_t) malloc(len, M_RTABLE, 651 M_NOWAIT); 652 if (rw->w_tmem) 653 rw->w_tmemsize = len; 654 } 655 if (rw->w_tmem) { 656 cp = rw->w_tmem; 657 second_time = 1; 658 goto again; 659 } else { 660 rw->w_tmemneeded = len; 661 return (ENOBUFS); 662 } 663 } 664 } 665 if (cp) { 666 struct rt_msghdr *rtm = (struct rt_msghdr *)cp0; 667 668 rtm->rtm_version = RTM_VERSION; 669 rtm->rtm_type = type; 670 rtm->rtm_msglen = len; 671 } 672 if (lenp) 673 *lenp = len; 674 return (0); 675 } 676 677 /* 678 * This routine is called to generate a message from the routing 679 * socket indicating that a redirect has occurred, a routing lookup 680 * has failed, or that a protocol has detected timeouts to a particular 681 * destination. 682 */ 683 void 684 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error) 685 { 686 struct rt_msghdr rtm; 687 struct mbuf *m; 688 const struct sockaddr *sa = rtinfo->rti_info[RTAX_DST]; 689 690 if (route_cb.any_count == 0) 691 return; 692 memset(&rtm, 0, sizeof(rtm)); 693 rtm.rtm_flags = RTF_DONE | flags; 694 rtm.rtm_errno = error; 695 m = rt_msg1(type, rtinfo, (caddr_t)&rtm, sizeof(rtm)); 696 if (m == 0) 697 return; 698 mtod(m, struct rt_msghdr *)->rtm_addrs = rtinfo->rti_addrs; 699 route_proto.sp_protocol = sa ? sa->sa_family : 0; 700 raw_input(m, &route_proto, &route_src, &route_dst); 701 } 702 703 /* 704 * This routine is called to generate a message from the routing 705 * socket indicating that the status of a network interface has changed. 706 */ 707 void 708 rt_ifmsg(struct ifnet *ifp) 709 { 710 struct if_msghdr ifm; 711 #ifdef COMPAT_14 712 struct if_msghdr14 oifm; 713 #endif 714 struct mbuf *m; 715 struct rt_addrinfo info; 716 717 if (route_cb.any_count == 0) 718 return; 719 memset(&info, 0, sizeof(info)); 720 memset(&ifm, 0, sizeof(ifm)); 721 ifm.ifm_index = ifp->if_index; 722 ifm.ifm_flags = ifp->if_flags; 723 ifm.ifm_data = ifp->if_data; 724 ifm.ifm_addrs = 0; 725 m = rt_msg1(RTM_IFINFO, &info, (caddr_t)&ifm, sizeof(ifm)); 726 if (m == 0) 727 return; 728 route_proto.sp_protocol = 0; 729 raw_input(m, &route_proto, &route_src, &route_dst); 730 #ifdef COMPAT_14 731 memset(&info, 0, sizeof(info)); 732 memset(&oifm, 0, sizeof(oifm)); 733 oifm.ifm_index = ifp->if_index; 734 oifm.ifm_flags = ifp->if_flags; 735 oifm.ifm_data.ifi_type = ifp->if_data.ifi_type; 736 oifm.ifm_data.ifi_addrlen = ifp->if_data.ifi_addrlen; 737 oifm.ifm_data.ifi_hdrlen = ifp->if_data.ifi_hdrlen; 738 oifm.ifm_data.ifi_mtu = ifp->if_data.ifi_mtu; 739 oifm.ifm_data.ifi_metric = ifp->if_data.ifi_metric; 740 oifm.ifm_data.ifi_baudrate = ifp->if_data.ifi_baudrate; 741 oifm.ifm_data.ifi_ipackets = ifp->if_data.ifi_ipackets; 742 oifm.ifm_data.ifi_ierrors = ifp->if_data.ifi_ierrors; 743 oifm.ifm_data.ifi_opackets = ifp->if_data.ifi_opackets; 744 oifm.ifm_data.ifi_oerrors = ifp->if_data.ifi_oerrors; 745 oifm.ifm_data.ifi_collisions = ifp->if_data.ifi_collisions; 746 oifm.ifm_data.ifi_ibytes = ifp->if_data.ifi_ibytes; 747 oifm.ifm_data.ifi_obytes = ifp->if_data.ifi_obytes; 748 oifm.ifm_data.ifi_imcasts = ifp->if_data.ifi_imcasts; 749 oifm.ifm_data.ifi_omcasts = ifp->if_data.ifi_omcasts; 750 oifm.ifm_data.ifi_iqdrops = ifp->if_data.ifi_iqdrops; 751 oifm.ifm_data.ifi_noproto = ifp->if_data.ifi_noproto; 752 oifm.ifm_data.ifi_lastchange = ifp->if_data.ifi_lastchange; 753 oifm.ifm_addrs = 0; 754 m = rt_msg1(RTM_OIFINFO, &info, (caddr_t)&oifm, sizeof(oifm)); 755 if (m == 0) 756 return; 757 route_proto.sp_protocol = 0; 758 raw_input(m, &route_proto, &route_src, &route_dst); 759 #endif 760 } 761 762 /* 763 * This is called to generate messages from the routing socket 764 * indicating a network interface has had addresses associated with it. 765 * if we ever reverse the logic and replace messages TO the routing 766 * socket indicate a request to configure interfaces, then it will 767 * be unnecessary as the routing socket will automatically generate 768 * copies of it. 769 */ 770 void 771 rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt) 772 { 773 struct rt_addrinfo info; 774 struct sockaddr *sa = NULL; 775 int pass; 776 struct mbuf *m = NULL; 777 struct ifnet *ifp = ifa->ifa_ifp; 778 779 if (route_cb.any_count == 0) 780 return; 781 for (pass = 1; pass < 3; pass++) { 782 memset(&info, 0, sizeof(info)); 783 if ((cmd == RTM_ADD && pass == 1) || 784 (cmd == RTM_DELETE && pass == 2)) { 785 struct ifa_msghdr ifam; 786 int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR; 787 788 ifaaddr = sa = ifa->ifa_addr; 789 ifpaddr = TAILQ_FIRST(&ifp->if_addrlist)->ifa_addr; 790 netmask = ifa->ifa_netmask; 791 brdaddr = ifa->ifa_dstaddr; 792 memset(&ifam, 0, sizeof(ifam)); 793 ifam.ifam_index = ifp->if_index; 794 ifam.ifam_metric = ifa->ifa_metric; 795 ifam.ifam_flags = ifa->ifa_flags; 796 m = rt_msg1(ncmd, &info, (caddr_t)&ifam, sizeof(ifam)); 797 if (m == NULL) 798 continue; 799 mtod(m, struct ifa_msghdr *)->ifam_addrs = 800 info.rti_addrs; 801 } 802 if ((cmd == RTM_ADD && pass == 2) || 803 (cmd == RTM_DELETE && pass == 1)) { 804 struct rt_msghdr rtm; 805 806 if (rt == 0) 807 continue; 808 netmask = rt_mask(rt); 809 dst = sa = rt_key(rt); 810 gate = rt->rt_gateway; 811 memset(&rtm, 0, sizeof(rtm)); 812 rtm.rtm_index = ifp->if_index; 813 rtm.rtm_flags |= rt->rt_flags; 814 rtm.rtm_errno = error; 815 m = rt_msg1(cmd, &info, (caddr_t)&rtm, sizeof(rtm)); 816 if (m == NULL) 817 continue; 818 mtod(m, struct rt_msghdr *)->rtm_addrs = info.rti_addrs; 819 } 820 route_proto.sp_protocol = sa ? sa->sa_family : 0; 821 raw_input(m, &route_proto, &route_src, &route_dst); 822 } 823 } 824 825 static struct mbuf * 826 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what, 827 struct rt_addrinfo *info) 828 { 829 struct if_announcemsghdr ifan; 830 831 memset(info, 0, sizeof(*info)); 832 memset(&ifan, 0, sizeof(ifan)); 833 ifan.ifan_index = ifp->if_index; 834 strlcpy(ifan.ifan_name, ifp->if_xname, sizeof(ifan.ifan_name)); 835 ifan.ifan_what = what; 836 return rt_msg1(type, info, (caddr_t)&ifan, sizeof(ifan)); 837 } 838 839 /* 840 * This is called to generate routing socket messages indicating 841 * network interface arrival and departure. 842 */ 843 void 844 rt_ifannouncemsg(struct ifnet *ifp, int what) 845 { 846 struct mbuf *m; 847 struct rt_addrinfo info; 848 849 if (route_cb.any_count == 0) 850 return; 851 m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info); 852 if (m == NULL) 853 return; 854 route_proto.sp_protocol = 0; 855 raw_input(m, &route_proto, &route_src, &route_dst); 856 } 857 858 /* 859 * This is called to generate routing socket messages indicating 860 * IEEE80211 wireless events. 861 * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way. 862 */ 863 void 864 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len) 865 { 866 struct mbuf *m; 867 struct rt_addrinfo info; 868 869 if (route_cb.any_count == 0) 870 return; 871 m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info); 872 if (m == NULL) 873 return; 874 /* 875 * Append the ieee80211 data. Try to stick it in the 876 * mbuf containing the ifannounce msg; otherwise allocate 877 * a new mbuf and append. 878 * 879 * NB: we assume m is a single mbuf. 880 */ 881 if (data_len > M_TRAILINGSPACE(m)) { 882 struct mbuf *n = m_get(M_NOWAIT, MT_DATA); 883 if (n == NULL) { 884 m_freem(m); 885 return; 886 } 887 (void)memcpy(mtod(n, void *), data, data_len); 888 n->m_len = data_len; 889 m->m_next = n; 890 } else if (data_len > 0) { 891 (void)memcpy(mtod(m, u_int8_t *) + m->m_len, data, data_len); 892 m->m_len += data_len; 893 } 894 if (m->m_flags & M_PKTHDR) 895 m->m_pkthdr.len += data_len; 896 mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len; 897 route_proto.sp_protocol = 0; 898 raw_input(m, &route_proto, &route_src, &route_dst); 899 } 900 901 /* 902 * This is used in dumping the kernel table via sysctl(). 903 */ 904 static int 905 sysctl_dumpentry(struct radix_node *rn, void *v) 906 { 907 struct walkarg *w = v; 908 struct rtentry *rt = (struct rtentry *)rn; 909 int error = 0, size; 910 struct rt_addrinfo info; 911 912 if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg)) 913 return 0; 914 memset(&info, 0, sizeof(info)); 915 dst = rt_key(rt); 916 gate = rt->rt_gateway; 917 netmask = rt_mask(rt); 918 genmask = rt->rt_genmask; 919 if (rt->rt_ifp) { 920 ifpaddr = TAILQ_FIRST(&rt->rt_ifp->if_addrlist)->ifa_addr; 921 ifaaddr = rt->rt_ifa->ifa_addr; 922 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT) 923 brdaddr = rt->rt_ifa->ifa_dstaddr; 924 } 925 if ((error = rt_msg2(RTM_GET, &info, 0, w, &size))) 926 return (error); 927 if (w->w_where && w->w_tmem && w->w_needed <= 0) { 928 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem; 929 930 rtm->rtm_flags = rt->rt_flags; 931 rtm->rtm_use = rt->rt_use; 932 rtm->rtm_rmx = rt->rt_rmx; 933 KASSERT(rt->rt_ifp != NULL); 934 rtm->rtm_index = rt->rt_ifp->if_index; 935 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0; 936 rtm->rtm_addrs = info.rti_addrs; 937 if ((error = copyout(rtm, w->w_where, size)) != 0) 938 w->w_where = NULL; 939 else 940 w->w_where += size; 941 } 942 return (error); 943 } 944 945 static int 946 sysctl_iflist(int af, struct walkarg *w, int type) 947 { 948 struct ifnet *ifp; 949 struct ifaddr *ifa; 950 struct rt_addrinfo info; 951 int len, error = 0; 952 953 memset(&info, 0, sizeof(info)); 954 IFNET_FOREACH(ifp) { 955 if (w->w_arg && w->w_arg != ifp->if_index) 956 continue; 957 ifa = TAILQ_FIRST(&ifp->if_addrlist); 958 if (ifa == NULL) 959 continue; 960 ifpaddr = ifa->ifa_addr; 961 switch (type) { 962 case NET_RT_IFLIST: 963 error = 964 rt_msg2(RTM_IFINFO, &info, (caddr_t)0, w, &len); 965 break; 966 #ifdef COMPAT_14 967 case NET_RT_OIFLIST: 968 error = 969 rt_msg2(RTM_OIFINFO, &info, (caddr_t)0, w, &len); 970 break; 971 #endif 972 default: 973 panic("sysctl_iflist(1)"); 974 } 975 if (error) 976 return (error); 977 ifpaddr = 0; 978 if (w->w_where && w->w_tmem && w->w_needed <= 0) { 979 switch (type) { 980 case NET_RT_IFLIST: { 981 struct if_msghdr *ifm; 982 983 ifm = (struct if_msghdr *)w->w_tmem; 984 ifm->ifm_index = ifp->if_index; 985 ifm->ifm_flags = ifp->if_flags; 986 ifm->ifm_data = ifp->if_data; 987 ifm->ifm_addrs = info.rti_addrs; 988 error = copyout(ifm, w->w_where, len); 989 if (error) 990 return (error); 991 w->w_where += len; 992 break; 993 } 994 995 #ifdef COMPAT_14 996 case NET_RT_OIFLIST: { 997 struct if_msghdr14 *ifm; 998 999 ifm = (struct if_msghdr14 *)w->w_tmem; 1000 ifm->ifm_index = ifp->if_index; 1001 ifm->ifm_flags = ifp->if_flags; 1002 ifm->ifm_data.ifi_type = ifp->if_data.ifi_type; 1003 ifm->ifm_data.ifi_addrlen = 1004 ifp->if_data.ifi_addrlen; 1005 ifm->ifm_data.ifi_hdrlen = 1006 ifp->if_data.ifi_hdrlen; 1007 ifm->ifm_data.ifi_mtu = ifp->if_data.ifi_mtu; 1008 ifm->ifm_data.ifi_metric = 1009 ifp->if_data.ifi_metric; 1010 ifm->ifm_data.ifi_baudrate = 1011 ifp->if_data.ifi_baudrate; 1012 ifm->ifm_data.ifi_ipackets = 1013 ifp->if_data.ifi_ipackets; 1014 ifm->ifm_data.ifi_ierrors = 1015 ifp->if_data.ifi_ierrors; 1016 ifm->ifm_data.ifi_opackets = 1017 ifp->if_data.ifi_opackets; 1018 ifm->ifm_data.ifi_oerrors = 1019 ifp->if_data.ifi_oerrors; 1020 ifm->ifm_data.ifi_collisions = 1021 ifp->if_data.ifi_collisions; 1022 ifm->ifm_data.ifi_ibytes = 1023 ifp->if_data.ifi_ibytes; 1024 ifm->ifm_data.ifi_obytes = 1025 ifp->if_data.ifi_obytes; 1026 ifm->ifm_data.ifi_imcasts = 1027 ifp->if_data.ifi_imcasts; 1028 ifm->ifm_data.ifi_omcasts = 1029 ifp->if_data.ifi_omcasts; 1030 ifm->ifm_data.ifi_iqdrops = 1031 ifp->if_data.ifi_iqdrops; 1032 ifm->ifm_data.ifi_noproto = 1033 ifp->if_data.ifi_noproto; 1034 ifm->ifm_data.ifi_lastchange = 1035 ifp->if_data.ifi_lastchange; 1036 ifm->ifm_addrs = info.rti_addrs; 1037 error = copyout(ifm, w->w_where, len); 1038 if (error) 1039 return (error); 1040 w->w_where += len; 1041 break; 1042 } 1043 #endif 1044 default: 1045 panic("sysctl_iflist(2)"); 1046 } 1047 } 1048 while ((ifa = TAILQ_NEXT(ifa, ifa_list)) != NULL) { 1049 if (af && af != ifa->ifa_addr->sa_family) 1050 continue; 1051 ifaaddr = ifa->ifa_addr; 1052 netmask = ifa->ifa_netmask; 1053 brdaddr = ifa->ifa_dstaddr; 1054 if ((error = rt_msg2(RTM_NEWADDR, &info, 0, w, &len))) 1055 return (error); 1056 if (w->w_where && w->w_tmem && w->w_needed <= 0) { 1057 struct ifa_msghdr *ifam; 1058 1059 ifam = (struct ifa_msghdr *)w->w_tmem; 1060 ifam->ifam_index = ifa->ifa_ifp->if_index; 1061 ifam->ifam_flags = ifa->ifa_flags; 1062 ifam->ifam_metric = ifa->ifa_metric; 1063 ifam->ifam_addrs = info.rti_addrs; 1064 error = copyout(w->w_tmem, w->w_where, len); 1065 if (error) 1066 return (error); 1067 w->w_where += len; 1068 } 1069 } 1070 ifaaddr = netmask = brdaddr = 0; 1071 } 1072 return (0); 1073 } 1074 1075 static int 1076 sysctl_rtable(SYSCTLFN_ARGS) 1077 { 1078 void *where = oldp; 1079 size_t *given = oldlenp; 1080 const void *new = newp; 1081 struct radix_node_head *rnh; 1082 int i, s, error = EINVAL; 1083 u_char af; 1084 struct walkarg w; 1085 1086 if (namelen == 1 && name[0] == CTL_QUERY) 1087 return (sysctl_query(SYSCTLFN_CALL(rnode))); 1088 1089 if (new) 1090 return (EPERM); 1091 if (namelen != 3) 1092 return (EINVAL); 1093 af = name[0]; 1094 w.w_tmemneeded = 0; 1095 w.w_tmemsize = 0; 1096 w.w_tmem = NULL; 1097 again: 1098 /* we may return here if a later [re]alloc of the t_mem buffer fails */ 1099 if (w.w_tmemneeded) { 1100 w.w_tmem = (caddr_t) malloc(w.w_tmemneeded, M_RTABLE, M_WAITOK); 1101 w.w_tmemsize = w.w_tmemneeded; 1102 w.w_tmemneeded = 0; 1103 } 1104 w.w_op = name[1]; 1105 w.w_arg = name[2]; 1106 w.w_given = *given; 1107 w.w_needed = 0 - w.w_given; 1108 w.w_where = where; 1109 1110 s = splsoftnet(); 1111 switch (w.w_op) { 1112 1113 case NET_RT_DUMP: 1114 case NET_RT_FLAGS: 1115 for (i = 1; i <= AF_MAX; i++) 1116 if ((rnh = rt_tables[i]) && (af == 0 || af == i) && 1117 (error = (*rnh->rnh_walktree)(rnh, 1118 sysctl_dumpentry, &w))) 1119 break; 1120 break; 1121 1122 #ifdef COMPAT_14 1123 case NET_RT_OIFLIST: 1124 error = sysctl_iflist(af, &w, w.w_op); 1125 break; 1126 #endif 1127 1128 case NET_RT_IFLIST: 1129 error = sysctl_iflist(af, &w, w.w_op); 1130 } 1131 splx(s); 1132 1133 /* check to see if we couldn't allocate memory with NOWAIT */ 1134 if (error == ENOBUFS && w.w_tmem == 0 && w.w_tmemneeded) 1135 goto again; 1136 1137 if (w.w_tmem) 1138 free(w.w_tmem, M_RTABLE); 1139 w.w_needed += w.w_given; 1140 if (where) { 1141 *given = w.w_where - (caddr_t) where; 1142 if (*given < w.w_needed) 1143 return (ENOMEM); 1144 } else { 1145 *given = (11 * w.w_needed) / 10; 1146 } 1147 return (error); 1148 } 1149 1150 /* 1151 * Definitions of protocols supported in the ROUTE domain. 1152 */ 1153 1154 const struct protosw routesw[] = { 1155 { 1156 SOCK_RAW, &routedomain, 0, PR_ATOMIC|PR_ADDR, 1157 raw_input, route_output, raw_ctlinput, 0, 1158 route_usrreq, 1159 raw_init, 0, 0, 0, 1160 } }; 1161 1162 struct domain routedomain = { 1163 .dom_family = PF_ROUTE, 1164 .dom_name = "route", 1165 .dom_init = route_init, 1166 .dom_protosw = routesw, 1167 .dom_protoswNPROTOSW = &routesw[sizeof(routesw)/sizeof(routesw[0])], 1168 }; 1169 1170 SYSCTL_SETUP(sysctl_net_route_setup, "sysctl net.route subtree setup") 1171 { 1172 const struct sysctlnode *rnode = NULL; 1173 1174 sysctl_createv(clog, 0, NULL, NULL, 1175 CTLFLAG_PERMANENT, 1176 CTLTYPE_NODE, "net", NULL, 1177 NULL, 0, NULL, 0, 1178 CTL_NET, CTL_EOL); 1179 1180 sysctl_createv(clog, 0, NULL, &rnode, 1181 CTLFLAG_PERMANENT, 1182 CTLTYPE_NODE, "route", 1183 SYSCTL_DESCR("PF_ROUTE information"), 1184 NULL, 0, NULL, 0, 1185 CTL_NET, PF_ROUTE, CTL_EOL); 1186 sysctl_createv(clog, 0, NULL, NULL, 1187 CTLFLAG_PERMANENT, 1188 CTLTYPE_NODE, "rtable", 1189 SYSCTL_DESCR("Routing table information"), 1190 sysctl_rtable, 0, NULL, 0, 1191 CTL_NET, PF_ROUTE, 0 /* any protocol */, CTL_EOL); 1192 sysctl_createv(clog, 0, &rnode, NULL, 1193 CTLFLAG_PERMANENT, 1194 CTLTYPE_STRUCT, "stats", 1195 SYSCTL_DESCR("Routing statistics"), 1196 NULL, 0, &rtstat, sizeof(rtstat), 1197 CTL_CREATE, CTL_EOL); 1198 } 1199
Indexes created Tue Sep 23 07:09:52 GMT 2025