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/systm.h> 40 #include <sys/kernel.h> 41 #include <sys/sysctl.h> 42 #include <sys/proc.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/socket.h> 46 #include <sys/socketvar.h> 47 #include <sys/domain.h> 48 #include <sys/protosw.h> 49 #include <sys/jail.h> 50 51 #include <net/if.h> 52 #include <net/route.h> 53 #include <net/raw_cb.h> 54 55 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables"); 56 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 static struct sockproto route_proto = { PF_ROUTE, }; 61 62 struct walkarg { 63 int w_tmemsize; 64 int w_op, w_arg; 65 caddr_t w_tmem; 66 struct sysctl_req *w_req; 67 }; 68 69 static struct mbuf * 70 rt_msg1 __P((int, struct rt_addrinfo *)); 71 static int rt_msg2 __P((int, 72 struct rt_addrinfo *, caddr_t, struct walkarg *)); 73 static int rt_xaddrs __P((caddr_t, caddr_t, struct rt_addrinfo *)); 74 static int sysctl_dumpentry __P((struct radix_node *rn, void *vw)); 75 static int sysctl_iflist __P((int af, struct walkarg *w)); 76 static int route_output __P((struct mbuf *, struct socket *)); 77 static void rt_setmetrics __P((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(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(curproc)) != 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 default: 599 len = sizeof(struct rt_msghdr); 600 } 601 if (len > MCLBYTES) 602 panic("rt_msg1"); 603 m = m_gethdr(M_DONTWAIT, MT_DATA); 604 if (m && len > MHLEN) { 605 MCLGET(m, M_DONTWAIT); 606 if ((m->m_flags & M_EXT) == 0) { 607 m_free(m); 608 m = NULL; 609 } 610 } 611 if (m == 0) 612 return (m); 613 m->m_pkthdr.len = m->m_len = len; 614 m->m_pkthdr.rcvif = 0; 615 rtm = mtod(m, struct rt_msghdr *); 616 bzero((caddr_t)rtm, len); 617 for (i = 0; i < RTAX_MAX; i++) { 618 if ((sa = rtinfo->rti_info[i]) == NULL) 619 continue; 620 rtinfo->rti_addrs |= (1 << i); 621 dlen = ROUNDUP(sa->sa_len); 622 m_copyback(m, len, dlen, (caddr_t)sa); 623 len += dlen; 624 } 625 if (m->m_pkthdr.len != len) { 626 m_freem(m); 627 return (NULL); 628 } 629 rtm->rtm_msglen = len; 630 rtm->rtm_version = RTM_VERSION; 631 rtm->rtm_type = type; 632 return (m); 633 } 634 635 static int 636 rt_msg2(type, rtinfo, cp, w) 637 int type; 638 register struct rt_addrinfo *rtinfo; 639 caddr_t cp; 640 struct walkarg *w; 641 { 642 register int i; 643 int len, dlen, second_time = 0; 644 caddr_t cp0; 645 646 rtinfo->rti_addrs = 0; 647 again: 648 switch (type) { 649 650 case RTM_DELADDR: 651 case RTM_NEWADDR: 652 len = sizeof(struct ifa_msghdr); 653 break; 654 655 case RTM_IFINFO: 656 len = sizeof(struct if_msghdr); 657 break; 658 659 default: 660 len = sizeof(struct rt_msghdr); 661 } 662 cp0 = cp; 663 if (cp0) 664 cp += len; 665 for (i = 0; i < RTAX_MAX; i++) { 666 register struct sockaddr *sa; 667 668 if ((sa = rtinfo->rti_info[i]) == 0) 669 continue; 670 rtinfo->rti_addrs |= (1 << i); 671 dlen = ROUNDUP(sa->sa_len); 672 if (cp) { 673 bcopy((caddr_t)sa, cp, (unsigned)dlen); 674 cp += dlen; 675 } 676 len += dlen; 677 } 678 if (cp == 0 && w != NULL && !second_time) { 679 register struct walkarg *rw = w; 680 681 if (rw->w_req) { 682 if (rw->w_tmemsize < len) { 683 if (rw->w_tmem) 684 free(rw->w_tmem, M_RTABLE); 685 rw->w_tmem = (caddr_t) 686 malloc(len, M_RTABLE, M_NOWAIT); 687 if (rw->w_tmem) 688 rw->w_tmemsize = len; 689 } 690 if (rw->w_tmem) { 691 cp = rw->w_tmem; 692 second_time = 1; 693 goto again; 694 } 695 } 696 } 697 if (cp) { 698 register struct rt_msghdr *rtm = (struct rt_msghdr *)cp0; 699 700 rtm->rtm_version = RTM_VERSION; 701 rtm->rtm_type = type; 702 rtm->rtm_msglen = len; 703 } 704 return (len); 705 } 706 707 /* 708 * This routine is called to generate a message from the routing 709 * socket indicating that a redirect has occured, a routing lookup 710 * has failed, or that a protocol has detected timeouts to a particular 711 * destination. 712 */ 713 void 714 rt_missmsg(type, rtinfo, flags, error) 715 int type, flags, error; 716 register struct rt_addrinfo *rtinfo; 717 { 718 register struct rt_msghdr *rtm; 719 register struct mbuf *m; 720 struct sockaddr *sa = rtinfo->rti_info[RTAX_DST]; 721 722 if (route_cb.any_count == 0) 723 return; 724 m = rt_msg1(type, rtinfo); 725 if (m == 0) 726 return; 727 rtm = mtod(m, struct rt_msghdr *); 728 rtm->rtm_flags = RTF_DONE | flags; 729 rtm->rtm_errno = error; 730 rtm->rtm_addrs = rtinfo->rti_addrs; 731 route_proto.sp_protocol = sa ? sa->sa_family : 0; 732 raw_input(m, &route_proto, &route_src, &route_dst); 733 } 734 735 /* 736 * This routine is called to generate a message from the routing 737 * socket indicating that the status of a network interface has changed. 738 */ 739 void 740 rt_ifmsg(ifp) 741 register struct ifnet *ifp; 742 { 743 register struct if_msghdr *ifm; 744 struct mbuf *m; 745 struct rt_addrinfo info; 746 747 if (route_cb.any_count == 0) 748 return; 749 bzero((caddr_t)&info, sizeof(info)); 750 m = rt_msg1(RTM_IFINFO, &info); 751 if (m == 0) 752 return; 753 ifm = mtod(m, struct if_msghdr *); 754 ifm->ifm_index = ifp->if_index; 755 ifm->ifm_flags = (u_short)ifp->if_flags; 756 ifm->ifm_data = ifp->if_data; 757 ifm->ifm_addrs = 0; 758 route_proto.sp_protocol = 0; 759 raw_input(m, &route_proto, &route_src, &route_dst); 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(cmd, ifa, error, rt) 772 int cmd, error; 773 register struct ifaddr *ifa; 774 register struct rtentry *rt; 775 { 776 struct rt_addrinfo info; 777 struct sockaddr *sa = 0; 778 int pass; 779 struct mbuf *m = 0; 780 struct ifnet *ifp = ifa->ifa_ifp; 781 782 if (route_cb.any_count == 0) 783 return; 784 for (pass = 1; pass < 3; pass++) { 785 bzero((caddr_t)&info, sizeof(info)); 786 if ((cmd == RTM_ADD && pass == 1) || 787 (cmd == RTM_DELETE && pass == 2)) { 788 register struct ifa_msghdr *ifam; 789 int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR; 790 791 ifaaddr = sa = ifa->ifa_addr; 792 ifpaddr = TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr; 793 netmask = ifa->ifa_netmask; 794 brdaddr = ifa->ifa_dstaddr; 795 if ((m = rt_msg1(ncmd, &info)) == NULL) 796 continue; 797 ifam = mtod(m, struct ifa_msghdr *); 798 ifam->ifam_index = ifp->if_index; 799 ifam->ifam_metric = ifa->ifa_metric; 800 ifam->ifam_flags = ifa->ifa_flags; 801 ifam->ifam_addrs = info.rti_addrs; 802 } 803 if ((cmd == RTM_ADD && pass == 2) || 804 (cmd == RTM_DELETE && pass == 1)) { 805 register struct rt_msghdr *rtm; 806 807 if (rt == 0) 808 continue; 809 netmask = rt_mask(rt); 810 dst = sa = rt_key(rt); 811 gate = rt->rt_gateway; 812 if ((m = rt_msg1(cmd, &info)) == NULL) 813 continue; 814 rtm = mtod(m, struct rt_msghdr *); 815 rtm->rtm_index = ifp->if_index; 816 rtm->rtm_flags |= rt->rt_flags; 817 rtm->rtm_errno = error; 818 rtm->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 /* 826 * This is the analogue to the rt_newaddrmsg which performs the same 827 * function but for multicast group memberhips. This is easier since 828 * there is no route state to worry about. 829 */ 830 void 831 rt_newmaddrmsg(cmd, ifma) 832 int cmd; 833 struct ifmultiaddr *ifma; 834 { 835 struct rt_addrinfo info; 836 struct mbuf *m = 0; 837 struct ifnet *ifp = ifma->ifma_ifp; 838 struct ifma_msghdr *ifmam; 839 840 if (route_cb.any_count == 0) 841 return; 842 843 bzero((caddr_t)&info, sizeof(info)); 844 ifaaddr = ifma->ifma_addr; 845 if (ifp && TAILQ_FIRST(&ifp->if_addrhead)) 846 ifpaddr = TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr; 847 else 848 ifpaddr = NULL; 849 /* 850 * If a link-layer address is present, present it as a ``gateway'' 851 * (similarly to how ARP entries, e.g., are presented). 852 */ 853 gate = ifma->ifma_lladdr; 854 if ((m = rt_msg1(cmd, &info)) == NULL) 855 return; 856 ifmam = mtod(m, struct ifma_msghdr *); 857 ifmam->ifmam_index = ifp->if_index; 858 ifmam->ifmam_addrs = info.rti_addrs; 859 route_proto.sp_protocol = ifma->ifma_addr->sa_family; 860 raw_input(m, &route_proto, &route_src, &route_dst); 861 } 862 863 /* 864 * This is used in dumping the kernel table via sysctl(). 865 */ 866 int 867 sysctl_dumpentry(rn, vw) 868 struct radix_node *rn; 869 void *vw; 870 { 871 register struct walkarg *w = vw; 872 register struct rtentry *rt = (struct rtentry *)rn; 873 int error = 0, size; 874 struct rt_addrinfo info; 875 876 if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg)) 877 return 0; 878 bzero((caddr_t)&info, sizeof(info)); 879 dst = rt_key(rt); 880 gate = rt->rt_gateway; 881 netmask = rt_mask(rt); 882 genmask = rt->rt_genmask; 883 if (rt->rt_ifp) { 884 ifpaddr = TAILQ_FIRST(&rt->rt_ifp->if_addrhead)->ifa_addr; 885 ifaaddr = rt->rt_ifa->ifa_addr; 886 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT) 887 brdaddr = rt->rt_ifa->ifa_dstaddr; 888 } 889 size = rt_msg2(RTM_GET, &info, 0, w); 890 if (w->w_req && w->w_tmem) { 891 register struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem; 892 893 rtm->rtm_flags = rt->rt_flags; 894 rtm->rtm_use = rt->rt_use; 895 rtm->rtm_rmx = rt->rt_rmx; 896 rtm->rtm_index = rt->rt_ifp->if_index; 897 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0; 898 rtm->rtm_addrs = info.rti_addrs; 899 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size); 900 return (error); 901 } 902 return (error); 903 } 904 905 int 906 sysctl_iflist(af, w) 907 int af; 908 register struct walkarg *w; 909 { 910 register struct ifnet *ifp; 911 register struct ifaddr *ifa; 912 struct rt_addrinfo info; 913 int len, error = 0; 914 915 bzero((caddr_t)&info, sizeof(info)); 916 TAILQ_FOREACH(ifp, &ifnet, if_link) { 917 if (w->w_arg && w->w_arg != ifp->if_index) 918 continue; 919 ifa = TAILQ_FIRST(&ifp->if_addrhead); 920 ifpaddr = ifa->ifa_addr; 921 len = rt_msg2(RTM_IFINFO, &info, (caddr_t)0, w); 922 ifpaddr = 0; 923 if (w->w_req && w->w_tmem) { 924 register struct if_msghdr *ifm; 925 926 ifm = (struct if_msghdr *)w->w_tmem; 927 ifm->ifm_index = ifp->if_index; 928 ifm->ifm_flags = (u_short)ifp->if_flags; 929 ifm->ifm_data = ifp->if_data; 930 ifm->ifm_addrs = info.rti_addrs; 931 error = SYSCTL_OUT(w->w_req,(caddr_t)ifm, len); 932 if (error) 933 goto done; 934 } 935 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != 0) { 936 if (af && af != ifa->ifa_addr->sa_family) 937 continue; 938 if (jailed(curproc->p_ucred) && 939 prison_if(curproc->p_ucred, ifa->ifa_addr)) 940 continue; 941 ifaaddr = ifa->ifa_addr; 942 netmask = ifa->ifa_netmask; 943 brdaddr = ifa->ifa_dstaddr; 944 len = rt_msg2(RTM_NEWADDR, &info, 0, w); 945 if (w->w_req && w->w_tmem) { 946 register struct ifa_msghdr *ifam; 947 948 ifam = (struct ifa_msghdr *)w->w_tmem; 949 ifam->ifam_index = ifa->ifa_ifp->if_index; 950 ifam->ifam_flags = ifa->ifa_flags; 951 ifam->ifam_metric = ifa->ifa_metric; 952 ifam->ifam_addrs = info.rti_addrs; 953 error = SYSCTL_OUT(w->w_req, w->w_tmem, len); 954 if (error) 955 goto done; 956 } 957 } 958 ifaaddr = netmask = brdaddr = 0; 959 } 960 done: 961 return (error); 962 } 963 964 static int 965 sysctl_rtsock(SYSCTL_HANDLER_ARGS) 966 { 967 int *name = (int *)arg1; 968 u_int namelen = arg2; 969 register struct radix_node_head *rnh; 970 int i, s, error = EINVAL; 971 u_char af; 972 struct walkarg w; 973 974 name ++; 975 namelen--; 976 if (req->newptr) 977 return (EPERM); 978 if (namelen != 3) 979 return (EINVAL); 980 af = name[0]; 981 Bzero(&w, sizeof(w)); 982 w.w_op = name[1]; 983 w.w_arg = name[2]; 984 w.w_req = req; 985 986 s = splnet(); 987 switch (w.w_op) { 988 989 case NET_RT_DUMP: 990 case NET_RT_FLAGS: 991 for (i = 1; i <= AF_MAX; i++) 992 if ((rnh = rt_tables[i]) && (af == 0 || af == i) && 993 (error = rnh->rnh_walktree(rnh, 994 sysctl_dumpentry, &w))) 995 break; 996 break; 997 998 case NET_RT_IFLIST: 999 error = sysctl_iflist(af, &w); 1000 } 1001 splx(s); 1002 if (w.w_tmem) 1003 free(w.w_tmem, M_RTABLE); 1004 return (error); 1005 } 1006 1007 SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, ""); 1008 1009 /* 1010 * Definitions of protocols supported in the ROUTE domain. 1011 */ 1012 1013 extern struct domain routedomain; /* or at least forward */ 1014 1015 static struct protosw routesw[] = { 1016 { SOCK_RAW, &routedomain, 0, PR_ATOMIC|PR_ADDR, 1017 0, route_output, raw_ctlinput, 0, 1018 0, 1019 raw_init, 0, 0, 0, 1020 &route_usrreqs 1021 } 1022 }; 1023 1024 static struct domain routedomain = 1025 { PF_ROUTE, "route", 0, 0, 0, 1026 routesw, &routesw[sizeof(routesw)/sizeof(routesw[0])] }; 1027 1028 DOMAIN_SET(route); 1029