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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)rtsock.c 8.7 (Berkeley) 10/12/95 34 * $FreeBSD$ 35 */ 36 37 38 #include <sys/param.h> 39 #include <sys/domain.h> 40 #include <sys/kernel.h> 41 #include <sys/jail.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/proc.h> 45 #include <sys/protosw.h> 46 #include <sys/signalvar.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/sysctl.h> 50 #include <sys/systm.h> 51 52 #include <net/if.h> 53 #include <net/raw_cb.h> 54 #include <net/route.h> 55 56 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables"); 57 58 static struct sockaddr route_dst = { 2, PF_ROUTE, }; 59 static struct sockaddr route_src = { 2, PF_ROUTE, }; 60 static struct sockaddr sa_zero = { sizeof(sa_zero), AF_INET, }; 61 static struct sockproto route_proto = { PF_ROUTE, }; 62 63 struct walkarg { 64 int w_tmemsize; 65 int w_op, w_arg; 66 caddr_t w_tmem; 67 struct sysctl_req *w_req; 68 }; 69 70 static struct mbuf * 71 rt_msg1(int, struct rt_addrinfo *); 72 static int rt_msg2(int, struct rt_addrinfo *, caddr_t, struct walkarg *); 73 static int rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *); 74 static int sysctl_dumpentry(struct radix_node *rn, void *vw); 75 static int sysctl_iflist(int af, struct walkarg *w); 76 static int route_output(struct mbuf *, struct socket *); 77 static void rt_setmetrics(u_long, struct rt_metrics *, struct rt_metrics *); 78 79 /* Sleazy use of local variables throughout file, warning!!!! */ 80 #define dst info.rti_info[RTAX_DST] 81 #define gate info.rti_info[RTAX_GATEWAY] 82 #define netmask info.rti_info[RTAX_NETMASK] 83 #define genmask info.rti_info[RTAX_GENMASK] 84 #define ifpaddr info.rti_info[RTAX_IFP] 85 #define ifaaddr info.rti_info[RTAX_IFA] 86 #define brdaddr info.rti_info[RTAX_BRD] 87 88 /* 89 * It really doesn't make any sense at all for this code to share much 90 * with raw_usrreq.c, since its functionality is so restricted. XXX 91 */ 92 static int 93 rts_abort(struct socket *so) 94 { 95 int s, error; 96 s = splnet(); 97 error = raw_usrreqs.pru_abort(so); 98 splx(s); 99 return error; 100 } 101 102 /* pru_accept is EOPNOTSUPP */ 103 104 static int 105 rts_attach(struct socket *so, int proto, struct thread *td) 106 { 107 struct rawcb *rp; 108 int s, error; 109 110 if (sotorawcb(so) != 0) 111 return EISCONN; /* XXX panic? */ 112 /* XXX */ 113 MALLOC(rp, struct rawcb *, sizeof *rp, M_PCB, M_WAITOK | M_ZERO); 114 if (rp == 0) 115 return ENOBUFS; 116 117 /* 118 * The splnet() is necessary to block protocols from sending 119 * error notifications (like RTM_REDIRECT or RTM_LOSING) while 120 * this PCB is extant but incompletely initialized. 121 * Probably we should try to do more of this work beforehand and 122 * eliminate the spl. 123 */ 124 s = splnet(); 125 so->so_pcb = (caddr_t)rp; 126 error = raw_attach(so, proto); 127 rp = sotorawcb(so); 128 if (error) { 129 splx(s); 130 so->so_pcb = NULL; 131 free(rp, M_PCB); 132 return error; 133 } 134 switch(rp->rcb_proto.sp_protocol) { 135 case AF_INET: 136 route_cb.ip_count++; 137 break; 138 case AF_INET6: 139 route_cb.ip6_count++; 140 break; 141 case AF_IPX: 142 route_cb.ipx_count++; 143 break; 144 case AF_NS: 145 route_cb.ns_count++; 146 break; 147 } 148 rp->rcb_faddr = &route_src; 149 route_cb.any_count++; 150 soisconnected_locked(so); 151 so->so_options |= SO_USELOOPBACK; 152 splx(s); 153 return 0; 154 } 155 156 static int 157 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 158 { 159 int s, error; 160 s = splnet(); 161 error = raw_usrreqs.pru_bind(so, nam, td); /* xxx just EINVAL */ 162 splx(s); 163 return error; 164 } 165 166 static int 167 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 168 { 169 int s, error; 170 s = splnet(); 171 error = raw_usrreqs.pru_connect(so, nam, td); /* XXX just EINVAL */ 172 splx(s); 173 return error; 174 } 175 176 /* pru_connect2 is EOPNOTSUPP */ 177 /* pru_control is EOPNOTSUPP */ 178 179 static int 180 rts_detach(struct socket *so) 181 { 182 struct rawcb *rp = sotorawcb(so); 183 int s, error; 184 185 s = splnet(); 186 if (rp != 0) { 187 switch(rp->rcb_proto.sp_protocol) { 188 case AF_INET: 189 route_cb.ip_count--; 190 break; 191 case AF_INET6: 192 route_cb.ip6_count--; 193 break; 194 case AF_IPX: 195 route_cb.ipx_count--; 196 break; 197 case AF_NS: 198 route_cb.ns_count--; 199 break; 200 } 201 route_cb.any_count--; 202 } 203 error = raw_usrreqs.pru_detach(so); 204 splx(s); 205 return error; 206 } 207 208 static int 209 rts_disconnect(struct socket *so) 210 { 211 int s, error; 212 s = splnet(); 213 error = raw_usrreqs.pru_disconnect(so); 214 splx(s); 215 return error; 216 } 217 218 /* pru_listen is EOPNOTSUPP */ 219 220 static int 221 rts_peeraddr(struct socket *so, struct sockaddr **nam) 222 { 223 int s, error; 224 s = splnet(); 225 error = raw_usrreqs.pru_peeraddr(so, nam); 226 splx(s); 227 return error; 228 } 229 230 /* pru_rcvd is EOPNOTSUPP */ 231 /* pru_rcvoob is EOPNOTSUPP */ 232 233 static int 234 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 235 struct mbuf *control, struct thread *td) 236 { 237 int s, error; 238 s = splnet(); 239 error = raw_usrreqs.pru_send(so, flags, m, nam, control, td); 240 splx(s); 241 return error; 242 } 243 244 /* pru_sense is null */ 245 246 static int 247 rts_shutdown(struct socket *so) 248 { 249 int s, error; 250 s = splnet(); 251 error = raw_usrreqs.pru_shutdown(so); 252 splx(s); 253 return error; 254 } 255 256 static int 257 rts_sockaddr(struct socket *so, struct sockaddr **nam) 258 { 259 int s, error; 260 s = splnet(); 261 error = raw_usrreqs.pru_sockaddr(so, nam); 262 splx(s); 263 return error; 264 } 265 266 static struct pr_usrreqs route_usrreqs = { 267 rts_abort, pru_accept_notsupp, rts_attach, rts_bind, rts_connect, 268 pru_connect2_notsupp, pru_control_notsupp, rts_detach, rts_disconnect, 269 pru_listen_notsupp, rts_peeraddr, pru_rcvd_notsupp, pru_rcvoob_notsupp, 270 rts_send, pru_sense_null, rts_shutdown, rts_sockaddr, 271 sosend, soreceive, sopoll 272 }; 273 274 /*ARGSUSED*/ 275 static int 276 route_output(m, so) 277 register struct mbuf *m; 278 struct socket *so; 279 { 280 register struct rt_msghdr *rtm = 0; 281 register struct rtentry *rt = 0; 282 struct rtentry *saved_nrt = 0; 283 struct radix_node_head *rnh; 284 struct rt_addrinfo info; 285 int len, error = 0; 286 struct ifnet *ifp = 0; 287 struct ifaddr *ifa = 0; 288 289 #define senderr(e) { error = e; goto flush;} 290 if (m == 0 || ((m->m_len < sizeof(long)) && 291 (m = m_pullup(m, sizeof(long))) == 0)) 292 return (ENOBUFS); 293 if ((m->m_flags & M_PKTHDR) == 0) 294 panic("route_output"); 295 len = m->m_pkthdr.len; 296 if (len < sizeof(*rtm) || 297 len != mtod(m, struct rt_msghdr *)->rtm_msglen) { 298 dst = 0; 299 senderr(EINVAL); 300 } 301 R_Malloc(rtm, struct rt_msghdr *, len); 302 if (rtm == 0) { 303 dst = 0; 304 senderr(ENOBUFS); 305 } 306 m_copydata(m, 0, len, (caddr_t)rtm); 307 if (rtm->rtm_version != RTM_VERSION) { 308 dst = 0; 309 senderr(EPROTONOSUPPORT); 310 } 311 rtm->rtm_pid = curproc->p_pid; 312 bzero(&info, sizeof(info)); 313 info.rti_addrs = rtm->rtm_addrs; 314 if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info)) { 315 dst = 0; 316 senderr(EINVAL); 317 } 318 info.rti_flags = rtm->rtm_flags; 319 if (dst == 0 || (dst->sa_family >= AF_MAX) 320 || (gate != 0 && (gate->sa_family >= AF_MAX))) 321 senderr(EINVAL); 322 if (genmask) { 323 struct radix_node *t; 324 t = rn_addmask((caddr_t)genmask, 0, 1); 325 if (t && Bcmp((caddr_t *)genmask + 1, (caddr_t *)t->rn_key + 1, 326 *(u_char *)t->rn_key - 1) == 0) 327 genmask = (struct sockaddr *)(t->rn_key); 328 else 329 senderr(ENOBUFS); 330 } 331 332 /* 333 * Verify that the caller has the appropriate privilege; RTM_GET 334 * is the only operation the non-superuser is allowed. 335 */ 336 if (rtm->rtm_type != RTM_GET && (error = suser(curthread)) != 0) 337 senderr(error); 338 339 switch (rtm->rtm_type) { 340 341 case RTM_ADD: 342 if (gate == 0) 343 senderr(EINVAL); 344 error = rtrequest1(RTM_ADD, &info, &saved_nrt); 345 if (error == 0 && saved_nrt) { 346 rt_setmetrics(rtm->rtm_inits, 347 &rtm->rtm_rmx, &saved_nrt->rt_rmx); 348 saved_nrt->rt_rmx.rmx_locks &= ~(rtm->rtm_inits); 349 saved_nrt->rt_rmx.rmx_locks |= 350 (rtm->rtm_inits & rtm->rtm_rmx.rmx_locks); 351 saved_nrt->rt_refcnt--; 352 saved_nrt->rt_genmask = genmask; 353 } 354 break; 355 356 case RTM_DELETE: 357 error = rtrequest1(RTM_DELETE, &info, &saved_nrt); 358 if (error == 0) { 359 if ((rt = saved_nrt)) 360 rt->rt_refcnt++; 361 goto report; 362 } 363 break; 364 365 case RTM_GET: 366 case RTM_CHANGE: 367 case RTM_LOCK: 368 if ((rnh = rt_tables[dst->sa_family]) == 0) { 369 senderr(EAFNOSUPPORT); 370 } else if ((rt = (struct rtentry *) 371 rnh->rnh_lookup(dst, netmask, rnh)) != NULL) 372 rt->rt_refcnt++; 373 else 374 senderr(ESRCH); 375 switch(rtm->rtm_type) { 376 377 case RTM_GET: 378 report: 379 dst = rt_key(rt); 380 gate = rt->rt_gateway; 381 netmask = rt_mask(rt); 382 genmask = rt->rt_genmask; 383 if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) { 384 ifp = rt->rt_ifp; 385 if (ifp) { 386 ifpaddr = TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr; 387 ifaaddr = rt->rt_ifa->ifa_addr; 388 if (ifp->if_flags & IFF_POINTOPOINT) 389 brdaddr = rt->rt_ifa->ifa_dstaddr; 390 rtm->rtm_index = ifp->if_index; 391 } else { 392 ifpaddr = 0; 393 ifaaddr = 0; 394 } 395 } 396 len = rt_msg2(rtm->rtm_type, &info, (caddr_t)0, 397 (struct walkarg *)0); 398 if (len > rtm->rtm_msglen) { 399 struct rt_msghdr *new_rtm; 400 R_Malloc(new_rtm, struct rt_msghdr *, len); 401 if (new_rtm == 0) 402 senderr(ENOBUFS); 403 Bcopy(rtm, new_rtm, rtm->rtm_msglen); 404 Free(rtm); rtm = new_rtm; 405 } 406 (void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm, 407 (struct walkarg *)0); 408 rtm->rtm_flags = rt->rt_flags; 409 rtm->rtm_rmx = rt->rt_rmx; 410 rtm->rtm_addrs = info.rti_addrs; 411 break; 412 413 case RTM_CHANGE: 414 /* new gateway could require new ifaddr, ifp; 415 flags may also be different; ifp may be specified 416 by ll sockaddr when protocol address is ambiguous */ 417 #define equal(a1, a2) (bcmp((caddr_t)(a1), (caddr_t)(a2), (a1)->sa_len) == 0) 418 if ((rt->rt_flags & RTF_GATEWAY && gate != NULL) || 419 ifpaddr != NULL || 420 (ifaaddr != NULL && 421 !equal(ifaaddr, rt->rt_ifa->ifa_addr))) { 422 if ((error = rt_getifa(&info)) != 0) 423 senderr(error); 424 } 425 if (gate != NULL && 426 (error = rt_setgate(rt, rt_key(rt), gate)) != 0) 427 senderr(error); 428 if ((ifa = info.rti_ifa) != NULL) { 429 register struct ifaddr *oifa = rt->rt_ifa; 430 if (oifa != ifa) { 431 if (oifa && oifa->ifa_rtrequest) 432 oifa->ifa_rtrequest(RTM_DELETE, rt, 433 &info); 434 IFAFREE(rt->rt_ifa); 435 rt->rt_ifa = ifa; 436 ifa->ifa_refcnt++; 437 rt->rt_ifp = info.rti_ifp; 438 } 439 } 440 rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx, 441 &rt->rt_rmx); 442 if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest) 443 rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info); 444 if (genmask) 445 rt->rt_genmask = genmask; 446 /* 447 * Fall into 448 */ 449 case RTM_LOCK: 450 rt->rt_rmx.rmx_locks &= ~(rtm->rtm_inits); 451 rt->rt_rmx.rmx_locks |= 452 (rtm->rtm_inits & rtm->rtm_rmx.rmx_locks); 453 break; 454 } 455 break; 456 457 default: 458 senderr(EOPNOTSUPP); 459 } 460 461 flush: 462 if (rtm) { 463 if (error) 464 rtm->rtm_errno = error; 465 else 466 rtm->rtm_flags |= RTF_DONE; 467 } 468 if (rt) 469 rtfree(rt); 470 { 471 register struct rawcb *rp = 0; 472 /* 473 * Check to see if we don't want our own messages. 474 */ 475 if ((so->so_options & SO_USELOOPBACK) == 0) { 476 if (route_cb.any_count <= 1) { 477 if (rtm) 478 Free(rtm); 479 m_freem(m); 480 return (error); 481 } 482 /* There is another listener, so construct message */ 483 rp = sotorawcb(so); 484 } 485 if (rtm) { 486 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm); 487 if (m->m_pkthdr.len < rtm->rtm_msglen) { 488 m_freem(m); 489 m = NULL; 490 } else if (m->m_pkthdr.len > rtm->rtm_msglen) 491 m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len); 492 Free(rtm); 493 } 494 if (rp) 495 rp->rcb_proto.sp_family = 0; /* Avoid us */ 496 if (dst) 497 route_proto.sp_protocol = dst->sa_family; 498 if (m) 499 raw_input(m, &route_proto, &route_src, &route_dst); 500 if (rp) 501 rp->rcb_proto.sp_family = PF_ROUTE; 502 } 503 return (error); 504 } 505 506 static void 507 rt_setmetrics(which, in, out) 508 u_long which; 509 register struct rt_metrics *in, *out; 510 { 511 #define metric(f, e) if (which & (f)) out->e = in->e; 512 metric(RTV_RPIPE, rmx_recvpipe); 513 metric(RTV_SPIPE, rmx_sendpipe); 514 metric(RTV_SSTHRESH, rmx_ssthresh); 515 metric(RTV_RTT, rmx_rtt); 516 metric(RTV_RTTVAR, rmx_rttvar); 517 metric(RTV_HOPCOUNT, rmx_hopcount); 518 metric(RTV_MTU, rmx_mtu); 519 metric(RTV_EXPIRE, rmx_expire); 520 #undef metric 521 } 522 523 #define ROUNDUP(a) \ 524 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 525 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 526 527 528 /* 529 * Extract the addresses of the passed sockaddrs. 530 * Do a little sanity checking so as to avoid bad memory references. 531 * This data is derived straight from userland. 532 */ 533 static int 534 rt_xaddrs(cp, cplim, rtinfo) 535 register caddr_t cp, cplim; 536 register struct rt_addrinfo *rtinfo; 537 { 538 register struct sockaddr *sa; 539 register int i; 540 541 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 542 if ((rtinfo->rti_addrs & (1 << i)) == 0) 543 continue; 544 sa = (struct sockaddr *)cp; 545 /* 546 * It won't fit. 547 */ 548 if ( (cp + sa->sa_len) > cplim ) { 549 return (EINVAL); 550 } 551 552 /* 553 * there are no more.. quit now 554 * If there are more bits, they are in error. 555 * I've seen this. route(1) can evidently generate these. 556 * This causes kernel to core dump. 557 * for compatibility, If we see this, point to a safe address. 558 */ 559 if (sa->sa_len == 0) { 560 rtinfo->rti_info[i] = &sa_zero; 561 return (0); /* should be EINVAL but for compat */ 562 } 563 564 /* accept it */ 565 rtinfo->rti_info[i] = sa; 566 ADVANCE(cp, sa); 567 } 568 return (0); 569 } 570 571 static struct mbuf * 572 rt_msg1(type, rtinfo) 573 int type; 574 register struct rt_addrinfo *rtinfo; 575 { 576 register struct rt_msghdr *rtm; 577 register struct mbuf *m; 578 register int i; 579 register struct sockaddr *sa; 580 int len, dlen; 581 582 switch (type) { 583 584 case RTM_DELADDR: 585 case RTM_NEWADDR: 586 len = sizeof(struct ifa_msghdr); 587 break; 588 589 case RTM_DELMADDR: 590 case RTM_NEWMADDR: 591 len = sizeof(struct ifma_msghdr); 592 break; 593 594 case RTM_IFINFO: 595 len = sizeof(struct if_msghdr); 596 break; 597 598 case RTM_IFANNOUNCE: 599 len = sizeof(struct if_announcemsghdr); 600 break; 601 602 default: 603 len = sizeof(struct rt_msghdr); 604 } 605 if (len > MCLBYTES) 606 panic("rt_msg1"); 607 m = m_gethdr(M_DONTWAIT, MT_DATA); 608 if (m && len > MHLEN) { 609 MCLGET(m, M_DONTWAIT); 610 if ((m->m_flags & M_EXT) == 0) { 611 m_free(m); 612 m = NULL; 613 } 614 } 615 if (m == 0) 616 return (m); 617 m->m_pkthdr.len = m->m_len = len; 618 m->m_pkthdr.rcvif = 0; 619 rtm = mtod(m, struct rt_msghdr *); 620 bzero((caddr_t)rtm, len); 621 for (i = 0; i < RTAX_MAX; i++) { 622 if ((sa = rtinfo->rti_info[i]) == NULL) 623 continue; 624 rtinfo->rti_addrs |= (1 << i); 625 dlen = ROUNDUP(sa->sa_len); 626 m_copyback(m, len, dlen, (caddr_t)sa); 627 len += dlen; 628 } 629 if (m->m_pkthdr.len != len) { 630 m_freem(m); 631 return (NULL); 632 } 633 rtm->rtm_msglen = len; 634 rtm->rtm_version = RTM_VERSION; 635 rtm->rtm_type = type; 636 return (m); 637 } 638 639 static int 640 rt_msg2(type, rtinfo, cp, w) 641 int type; 642 register struct rt_addrinfo *rtinfo; 643 caddr_t cp; 644 struct walkarg *w; 645 { 646 register int i; 647 int len, dlen, second_time = 0; 648 caddr_t cp0; 649 650 rtinfo->rti_addrs = 0; 651 again: 652 switch (type) { 653 654 case RTM_DELADDR: 655 case RTM_NEWADDR: 656 len = sizeof(struct ifa_msghdr); 657 break; 658 659 case RTM_IFINFO: 660 len = sizeof(struct if_msghdr); 661 break; 662 663 default: 664 len = sizeof(struct rt_msghdr); 665 } 666 cp0 = cp; 667 if (cp0) 668 cp += len; 669 for (i = 0; i < RTAX_MAX; i++) { 670 register struct sockaddr *sa; 671 672 if ((sa = rtinfo->rti_info[i]) == 0) 673 continue; 674 rtinfo->rti_addrs |= (1 << i); 675 dlen = ROUNDUP(sa->sa_len); 676 if (cp) { 677 bcopy((caddr_t)sa, cp, (unsigned)dlen); 678 cp += dlen; 679 } 680 len += dlen; 681 } 682 len = ALIGN(len); 683 if (cp == 0 && w != NULL && !second_time) { 684 register struct walkarg *rw = w; 685 686 if (rw->w_req) { 687 if (rw->w_tmemsize < len) { 688 if (rw->w_tmem) 689 free(rw->w_tmem, M_RTABLE); 690 rw->w_tmem = (caddr_t) 691 malloc(len, M_RTABLE, M_NOWAIT); 692 if (rw->w_tmem) 693 rw->w_tmemsize = len; 694 } 695 if (rw->w_tmem) { 696 cp = rw->w_tmem; 697 second_time = 1; 698 goto again; 699 } 700 } 701 } 702 if (cp) { 703 register struct rt_msghdr *rtm = (struct rt_msghdr *)cp0; 704 705 rtm->rtm_version = RTM_VERSION; 706 rtm->rtm_type = type; 707 rtm->rtm_msglen = len; 708 } 709 return (len); 710 } 711 712 /* 713 * This routine is called to generate a message from the routing 714 * socket indicating that a redirect has occured, a routing lookup 715 * has failed, or that a protocol has detected timeouts to a particular 716 * destination. 717 */ 718 void 719 rt_missmsg(type, rtinfo, flags, error) 720 int type, flags, error; 721 register struct rt_addrinfo *rtinfo; 722 { 723 register struct rt_msghdr *rtm; 724 register struct mbuf *m; 725 struct sockaddr *sa = rtinfo->rti_info[RTAX_DST]; 726 727 if (route_cb.any_count == 0) 728 return; 729 m = rt_msg1(type, rtinfo); 730 if (m == 0) 731 return; 732 rtm = mtod(m, struct rt_msghdr *); 733 rtm->rtm_flags = RTF_DONE | flags; 734 rtm->rtm_errno = error; 735 rtm->rtm_addrs = rtinfo->rti_addrs; 736 route_proto.sp_protocol = sa ? sa->sa_family : 0; 737 raw_input(m, &route_proto, &route_src, &route_dst); 738 } 739 740 /* 741 * This routine is called to generate a message from the routing 742 * socket indicating that the status of a network interface has changed. 743 */ 744 void 745 rt_ifmsg(ifp) 746 register struct ifnet *ifp; 747 { 748 register struct if_msghdr *ifm; 749 struct mbuf *m; 750 struct rt_addrinfo info; 751 752 if (route_cb.any_count == 0) 753 return; 754 bzero((caddr_t)&info, sizeof(info)); 755 m = rt_msg1(RTM_IFINFO, &info); 756 if (m == 0) 757 return; 758 ifm = mtod(m, struct if_msghdr *); 759 ifm->ifm_index = ifp->if_index; 760 ifm->ifm_flags = (u_short)ifp->if_flags; 761 ifm->ifm_data = ifp->if_data; 762 ifm->ifm_addrs = 0; 763 route_proto.sp_protocol = 0; 764 raw_input(m, &route_proto, &route_src, &route_dst); 765 } 766 767 /* 768 * This is called to generate messages from the routing socket 769 * indicating a network interface has had addresses associated with it. 770 * if we ever reverse the logic and replace messages TO the routing 771 * socket indicate a request to configure interfaces, then it will 772 * be unnecessary as the routing socket will automatically generate 773 * copies of it. 774 */ 775 void 776 rt_newaddrmsg(cmd, ifa, error, rt) 777 int cmd, error; 778 register struct ifaddr *ifa; 779 register struct rtentry *rt; 780 { 781 struct rt_addrinfo info; 782 struct sockaddr *sa = 0; 783 int pass; 784 struct mbuf *m = 0; 785 struct ifnet *ifp = ifa->ifa_ifp; 786 787 if (route_cb.any_count == 0) 788 return; 789 for (pass = 1; pass < 3; pass++) { 790 bzero((caddr_t)&info, sizeof(info)); 791 if ((cmd == RTM_ADD && pass == 1) || 792 (cmd == RTM_DELETE && pass == 2)) { 793 register struct ifa_msghdr *ifam; 794 int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR; 795 796 ifaaddr = sa = ifa->ifa_addr; 797 ifpaddr = TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr; 798 netmask = ifa->ifa_netmask; 799 brdaddr = ifa->ifa_dstaddr; 800 if ((m = rt_msg1(ncmd, &info)) == NULL) 801 continue; 802 ifam = mtod(m, struct ifa_msghdr *); 803 ifam->ifam_index = ifp->if_index; 804 ifam->ifam_metric = ifa->ifa_metric; 805 ifam->ifam_flags = ifa->ifa_flags; 806 ifam->ifam_addrs = info.rti_addrs; 807 } 808 if ((cmd == RTM_ADD && pass == 2) || 809 (cmd == RTM_DELETE && pass == 1)) { 810 register struct rt_msghdr *rtm; 811 812 if (rt == 0) 813 continue; 814 netmask = rt_mask(rt); 815 dst = sa = rt_key(rt); 816 gate = rt->rt_gateway; 817 if ((m = rt_msg1(cmd, &info)) == NULL) 818 continue; 819 rtm = mtod(m, struct rt_msghdr *); 820 rtm->rtm_index = ifp->if_index; 821 rtm->rtm_flags |= rt->rt_flags; 822 rtm->rtm_errno = error; 823 rtm->rtm_addrs = info.rti_addrs; 824 } 825 route_proto.sp_protocol = sa ? sa->sa_family : 0; 826 raw_input(m, &route_proto, &route_src, &route_dst); 827 } 828 } 829 830 /* 831 * This is the analogue to the rt_newaddrmsg which performs the same 832 * function but for multicast group memberhips. This is easier since 833 * there is no route state to worry about. 834 */ 835 void 836 rt_newmaddrmsg(cmd, ifma) 837 int cmd; 838 struct ifmultiaddr *ifma; 839 { 840 struct rt_addrinfo info; 841 struct mbuf *m = 0; 842 struct ifnet *ifp = ifma->ifma_ifp; 843 struct ifma_msghdr *ifmam; 844 845 if (route_cb.any_count == 0) 846 return; 847 848 bzero((caddr_t)&info, sizeof(info)); 849 ifaaddr = ifma->ifma_addr; 850 if (ifp && TAILQ_FIRST(&ifp->if_addrhead)) 851 ifpaddr = TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr; 852 else 853 ifpaddr = NULL; 854 /* 855 * If a link-layer address is present, present it as a ``gateway'' 856 * (similarly to how ARP entries, e.g., are presented). 857 */ 858 gate = ifma->ifma_lladdr; 859 if ((m = rt_msg1(cmd, &info)) == NULL) 860 return; 861 ifmam = mtod(m, struct ifma_msghdr *); 862 ifmam->ifmam_index = ifp->if_index; 863 ifmam->ifmam_addrs = info.rti_addrs; 864 route_proto.sp_protocol = ifma->ifma_addr->sa_family; 865 raw_input(m, &route_proto, &route_src, &route_dst); 866 } 867 868 /* 869 * This is called to generate routing socket messages indicating 870 * network interface arrival and departure. 871 */ 872 void 873 rt_ifannouncemsg(ifp, what) 874 struct ifnet *ifp; 875 int what; 876 { 877 struct if_announcemsghdr *ifan; 878 struct mbuf *m; 879 struct rt_addrinfo info; 880 881 if (route_cb.any_count == 0) 882 return; 883 bzero((caddr_t)&info, sizeof(info)); 884 m = rt_msg1(RTM_IFANNOUNCE, &info); 885 if (m == NULL) 886 return; 887 ifan = mtod(m, struct if_announcemsghdr *); 888 ifan->ifan_index = ifp->if_index; 889 snprintf(ifan->ifan_name, sizeof(ifan->ifan_name), 890 "%s%d", ifp->if_name, ifp->if_unit); 891 ifan->ifan_what = what; 892 route_proto.sp_protocol = 0; 893 raw_input(m, &route_proto, &route_src, &route_dst); 894 } 895 896 /* 897 * This is used in dumping the kernel table via sysctl(). 898 */ 899 int 900 sysctl_dumpentry(rn, vw) 901 struct radix_node *rn; 902 void *vw; 903 { 904 register struct walkarg *w = vw; 905 register struct rtentry *rt = (struct rtentry *)rn; 906 int error = 0, size; 907 struct rt_addrinfo info; 908 909 if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg)) 910 return 0; 911 bzero((caddr_t)&info, sizeof(info)); 912 dst = rt_key(rt); 913 gate = rt->rt_gateway; 914 netmask = rt_mask(rt); 915 genmask = rt->rt_genmask; 916 if (rt->rt_ifp) { 917 ifpaddr = TAILQ_FIRST(&rt->rt_ifp->if_addrhead)->ifa_addr; 918 ifaaddr = rt->rt_ifa->ifa_addr; 919 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT) 920 brdaddr = rt->rt_ifa->ifa_dstaddr; 921 } 922 size = rt_msg2(RTM_GET, &info, 0, w); 923 if (w->w_req && w->w_tmem) { 924 register struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem; 925 926 rtm->rtm_flags = rt->rt_flags; 927 rtm->rtm_use = rt->rt_use; 928 rtm->rtm_rmx = rt->rt_rmx; 929 rtm->rtm_index = rt->rt_ifp->if_index; 930 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0; 931 rtm->rtm_addrs = info.rti_addrs; 932 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size); 933 return (error); 934 } 935 return (error); 936 } 937 938 int 939 sysctl_iflist(af, w) 940 int af; 941 register struct walkarg *w; 942 { 943 register struct ifnet *ifp; 944 register struct ifaddr *ifa; 945 struct rt_addrinfo info; 946 int len, error = 0; 947 948 bzero((caddr_t)&info, sizeof(info)); 949 TAILQ_FOREACH(ifp, &ifnet, if_link) { 950 if (w->w_arg && w->w_arg != ifp->if_index) 951 continue; 952 ifa = TAILQ_FIRST(&ifp->if_addrhead); 953 ifpaddr = ifa->ifa_addr; 954 len = rt_msg2(RTM_IFINFO, &info, (caddr_t)0, w); 955 ifpaddr = 0; 956 if (w->w_req && w->w_tmem) { 957 register struct if_msghdr *ifm; 958 959 ifm = (struct if_msghdr *)w->w_tmem; 960 ifm->ifm_index = ifp->if_index; 961 ifm->ifm_flags = (u_short)ifp->if_flags; 962 ifm->ifm_data = ifp->if_data; 963 ifm->ifm_addrs = info.rti_addrs; 964 error = SYSCTL_OUT(w->w_req,(caddr_t)ifm, len); 965 if (error) 966 goto done; 967 } 968 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != 0) { 969 if (af && af != ifa->ifa_addr->sa_family) 970 continue; 971 if (jailed(curthread->td_ucred) && 972 prison_if(curthread->td_ucred, ifa->ifa_addr)) 973 continue; 974 ifaaddr = ifa->ifa_addr; 975 netmask = ifa->ifa_netmask; 976 brdaddr = ifa->ifa_dstaddr; 977 len = rt_msg2(RTM_NEWADDR, &info, 0, w); 978 if (w->w_req && w->w_tmem) { 979 register struct ifa_msghdr *ifam; 980 981 ifam = (struct ifa_msghdr *)w->w_tmem; 982 ifam->ifam_index = ifa->ifa_ifp->if_index; 983 ifam->ifam_flags = ifa->ifa_flags; 984 ifam->ifam_metric = ifa->ifa_metric; 985 ifam->ifam_addrs = info.rti_addrs; 986 error = SYSCTL_OUT(w->w_req, w->w_tmem, len); 987 if (error) 988 goto done; 989 } 990 } 991 ifaaddr = netmask = brdaddr = 0; 992 } 993 done: 994 return (error); 995 } 996 997 static int 998 sysctl_rtsock(SYSCTL_HANDLER_ARGS) 999 { 1000 int *name = (int *)arg1; 1001 u_int namelen = arg2; 1002 register struct radix_node_head *rnh; 1003 int i, s, error = EINVAL; 1004 u_char af; 1005 struct walkarg w; 1006 1007 name ++; 1008 namelen--; 1009 if (req->newptr) 1010 return (EPERM); 1011 if (namelen != 3) 1012 return ((namelen < 3) ? EISDIR : ENOTDIR); 1013 af = name[0]; 1014 Bzero(&w, sizeof(w)); 1015 w.w_op = name[1]; 1016 w.w_arg = name[2]; 1017 w.w_req = req; 1018 1019 s = splnet(); 1020 switch (w.w_op) { 1021 1022 case NET_RT_DUMP: 1023 case NET_RT_FLAGS: 1024 for (i = 1; i <= AF_MAX; i++) 1025 if ((rnh = rt_tables[i]) && (af == 0 || af == i) && 1026 (error = rnh->rnh_walktree(rnh, 1027 sysctl_dumpentry, &w))) 1028 break; 1029 break; 1030 1031 case NET_RT_IFLIST: 1032 error = sysctl_iflist(af, &w); 1033 } 1034 splx(s); 1035 if (w.w_tmem) 1036 free(w.w_tmem, M_RTABLE); 1037 return (error); 1038 } 1039 1040 SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, ""); 1041 1042 /* 1043 * Definitions of protocols supported in the ROUTE domain. 1044 */ 1045 1046 extern struct domain routedomain; /* or at least forward */ 1047 1048 static struct protosw routesw[] = { 1049 { SOCK_RAW, &routedomain, 0, PR_ATOMIC|PR_ADDR, 1050 0, route_output, raw_ctlinput, 0, 1051 0, 1052 raw_init, 0, 0, 0, 1053 &route_usrreqs 1054 } 1055 }; 1056 1057 static struct domain routedomain = 1058 { PF_ROUTE, "route", 0, 0, 0, 1059 routesw, &routesw[sizeof(routesw)/sizeof(routesw[0])] }; 1060 1061 DOMAIN_SET(route); 1062