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 /* 415 * If they tried to change things but didn't specify 416 * the required gateway, then just use the old one. 417 * This can happen if the user tries to change the 418 * flags on the default route without changing the 419 * default gateway. Changing flags still doesn't work. 420 */ 421 if ((rt->rt_flags & RTF_GATEWAY) && !gate) 422 gate = rt->rt_gateway; 423 424 /* new gateway could require new ifaddr, ifp; 425 flags may also be different; ifp may be specified 426 by ll sockaddr when protocol address is ambiguous */ 427 if ((error = rt_getifa(&info)) != 0) 428 senderr(error); 429 if (gate != NULL && 430 (error = rt_setgate(rt, rt_key(rt), gate)) != 0) 431 senderr(error); 432 if ((ifa = info.rti_ifa) != NULL) { 433 register struct ifaddr *oifa = rt->rt_ifa; 434 if (oifa != ifa) { 435 if (oifa && oifa->ifa_rtrequest) 436 oifa->ifa_rtrequest(RTM_DELETE, rt, 437 &info); 438 IFAFREE(rt->rt_ifa); 439 rt->rt_ifa = ifa; 440 ifa->ifa_refcnt++; 441 rt->rt_ifp = info.rti_ifp; 442 } 443 } 444 rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx, 445 &rt->rt_rmx); 446 if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest) 447 rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info); 448 if (genmask) 449 rt->rt_genmask = genmask; 450 /* 451 * Fall into 452 */ 453 case RTM_LOCK: 454 rt->rt_rmx.rmx_locks &= ~(rtm->rtm_inits); 455 rt->rt_rmx.rmx_locks |= 456 (rtm->rtm_inits & rtm->rtm_rmx.rmx_locks); 457 break; 458 } 459 break; 460 461 default: 462 senderr(EOPNOTSUPP); 463 } 464 465 flush: 466 if (rtm) { 467 if (error) 468 rtm->rtm_errno = error; 469 else 470 rtm->rtm_flags |= RTF_DONE; 471 } 472 if (rt) 473 rtfree(rt); 474 { 475 register struct rawcb *rp = 0; 476 /* 477 * Check to see if we don't want our own messages. 478 */ 479 if ((so->so_options & SO_USELOOPBACK) == 0) { 480 if (route_cb.any_count <= 1) { 481 if (rtm) 482 Free(rtm); 483 m_freem(m); 484 return (error); 485 } 486 /* There is another listener, so construct message */ 487 rp = sotorawcb(so); 488 } 489 if (rtm) { 490 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm); 491 if (m->m_pkthdr.len < rtm->rtm_msglen) { 492 m_freem(m); 493 m = NULL; 494 } else if (m->m_pkthdr.len > rtm->rtm_msglen) 495 m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len); 496 Free(rtm); 497 } 498 if (rp) 499 rp->rcb_proto.sp_family = 0; /* Avoid us */ 500 if (dst) 501 route_proto.sp_protocol = dst->sa_family; 502 if (m) 503 raw_input(m, &route_proto, &route_src, &route_dst); 504 if (rp) 505 rp->rcb_proto.sp_family = PF_ROUTE; 506 } 507 return (error); 508 } 509 510 static void 511 rt_setmetrics(which, in, out) 512 u_long which; 513 register struct rt_metrics *in, *out; 514 { 515 #define metric(f, e) if (which & (f)) out->e = in->e; 516 metric(RTV_RPIPE, rmx_recvpipe); 517 metric(RTV_SPIPE, rmx_sendpipe); 518 metric(RTV_SSTHRESH, rmx_ssthresh); 519 metric(RTV_RTT, rmx_rtt); 520 metric(RTV_RTTVAR, rmx_rttvar); 521 metric(RTV_HOPCOUNT, rmx_hopcount); 522 metric(RTV_MTU, rmx_mtu); 523 metric(RTV_EXPIRE, rmx_expire); 524 #undef metric 525 } 526 527 #define ROUNDUP(a) \ 528 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 529 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 530 531 532 /* 533 * Extract the addresses of the passed sockaddrs. 534 * Do a little sanity checking so as to avoid bad memory references. 535 * This data is derived straight from userland. 536 */ 537 static int 538 rt_xaddrs(cp, cplim, rtinfo) 539 register caddr_t cp, cplim; 540 register struct rt_addrinfo *rtinfo; 541 { 542 register struct sockaddr *sa; 543 register int i; 544 545 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 546 if ((rtinfo->rti_addrs & (1 << i)) == 0) 547 continue; 548 sa = (struct sockaddr *)cp; 549 /* 550 * It won't fit. 551 */ 552 if ( (cp + sa->sa_len) > cplim ) { 553 return (EINVAL); 554 } 555 556 /* 557 * there are no more.. quit now 558 * If there are more bits, they are in error. 559 * I've seen this. route(1) can evidently generate these. 560 * This causes kernel to core dump. 561 * for compatibility, If we see this, point to a safe address. 562 */ 563 if (sa->sa_len == 0) { 564 rtinfo->rti_info[i] = &sa_zero; 565 return (0); /* should be EINVAL but for compat */ 566 } 567 568 /* accept it */ 569 rtinfo->rti_info[i] = sa; 570 ADVANCE(cp, sa); 571 } 572 return (0); 573 } 574 575 static struct mbuf * 576 rt_msg1(type, rtinfo) 577 int type; 578 register struct rt_addrinfo *rtinfo; 579 { 580 register struct rt_msghdr *rtm; 581 register struct mbuf *m; 582 register int i; 583 register struct sockaddr *sa; 584 int len, dlen; 585 586 switch (type) { 587 588 case RTM_DELADDR: 589 case RTM_NEWADDR: 590 len = sizeof(struct ifa_msghdr); 591 break; 592 593 case RTM_DELMADDR: 594 case RTM_NEWMADDR: 595 len = sizeof(struct ifma_msghdr); 596 break; 597 598 case RTM_IFINFO: 599 len = sizeof(struct if_msghdr); 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 if (cp == 0 && w != NULL && !second_time) { 683 register struct walkarg *rw = w; 684 685 if (rw->w_req) { 686 if (rw->w_tmemsize < len) { 687 if (rw->w_tmem) 688 free(rw->w_tmem, M_RTABLE); 689 rw->w_tmem = (caddr_t) 690 malloc(len, M_RTABLE, M_NOWAIT); 691 if (rw->w_tmem) 692 rw->w_tmemsize = len; 693 } 694 if (rw->w_tmem) { 695 cp = rw->w_tmem; 696 second_time = 1; 697 goto again; 698 } 699 } 700 } 701 if (cp) { 702 register struct rt_msghdr *rtm = (struct rt_msghdr *)cp0; 703 704 rtm->rtm_version = RTM_VERSION; 705 rtm->rtm_type = type; 706 rtm->rtm_msglen = len; 707 } 708 return (len); 709 } 710 711 /* 712 * This routine is called to generate a message from the routing 713 * socket indicating that a redirect has occured, a routing lookup 714 * has failed, or that a protocol has detected timeouts to a particular 715 * destination. 716 */ 717 void 718 rt_missmsg(type, rtinfo, flags, error) 719 int type, flags, error; 720 register struct rt_addrinfo *rtinfo; 721 { 722 register struct rt_msghdr *rtm; 723 register struct mbuf *m; 724 struct sockaddr *sa = rtinfo->rti_info[RTAX_DST]; 725 726 if (route_cb.any_count == 0) 727 return; 728 m = rt_msg1(type, rtinfo); 729 if (m == 0) 730 return; 731 rtm = mtod(m, struct rt_msghdr *); 732 rtm->rtm_flags = RTF_DONE | flags; 733 rtm->rtm_errno = error; 734 rtm->rtm_addrs = rtinfo->rti_addrs; 735 route_proto.sp_protocol = sa ? sa->sa_family : 0; 736 raw_input(m, &route_proto, &route_src, &route_dst); 737 } 738 739 /* 740 * This routine is called to generate a message from the routing 741 * socket indicating that the status of a network interface has changed. 742 */ 743 void 744 rt_ifmsg(ifp) 745 register struct ifnet *ifp; 746 { 747 register struct if_msghdr *ifm; 748 struct mbuf *m; 749 struct rt_addrinfo info; 750 751 if (route_cb.any_count == 0) 752 return; 753 bzero((caddr_t)&info, sizeof(info)); 754 m = rt_msg1(RTM_IFINFO, &info); 755 if (m == 0) 756 return; 757 ifm = mtod(m, struct if_msghdr *); 758 ifm->ifm_index = ifp->if_index; 759 ifm->ifm_flags = (u_short)ifp->if_flags; 760 ifm->ifm_data = ifp->if_data; 761 ifm->ifm_addrs = 0; 762 route_proto.sp_protocol = 0; 763 raw_input(m, &route_proto, &route_src, &route_dst); 764 } 765 766 /* 767 * This is called to generate messages from the routing socket 768 * indicating a network interface has had addresses associated with it. 769 * if we ever reverse the logic and replace messages TO the routing 770 * socket indicate a request to configure interfaces, then it will 771 * be unnecessary as the routing socket will automatically generate 772 * copies of it. 773 */ 774 void 775 rt_newaddrmsg(cmd, ifa, error, rt) 776 int cmd, error; 777 register struct ifaddr *ifa; 778 register struct rtentry *rt; 779 { 780 struct rt_addrinfo info; 781 struct sockaddr *sa = 0; 782 int pass; 783 struct mbuf *m = 0; 784 struct ifnet *ifp = ifa->ifa_ifp; 785 786 if (route_cb.any_count == 0) 787 return; 788 for (pass = 1; pass < 3; pass++) { 789 bzero((caddr_t)&info, sizeof(info)); 790 if ((cmd == RTM_ADD && pass == 1) || 791 (cmd == RTM_DELETE && pass == 2)) { 792 register struct ifa_msghdr *ifam; 793 int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR; 794 795 ifaaddr = sa = ifa->ifa_addr; 796 ifpaddr = TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr; 797 netmask = ifa->ifa_netmask; 798 brdaddr = ifa->ifa_dstaddr; 799 if ((m = rt_msg1(ncmd, &info)) == NULL) 800 continue; 801 ifam = mtod(m, struct ifa_msghdr *); 802 ifam->ifam_index = ifp->if_index; 803 ifam->ifam_metric = ifa->ifa_metric; 804 ifam->ifam_flags = ifa->ifa_flags; 805 ifam->ifam_addrs = info.rti_addrs; 806 } 807 if ((cmd == RTM_ADD && pass == 2) || 808 (cmd == RTM_DELETE && pass == 1)) { 809 register struct rt_msghdr *rtm; 810 811 if (rt == 0) 812 continue; 813 netmask = rt_mask(rt); 814 dst = sa = rt_key(rt); 815 gate = rt->rt_gateway; 816 if ((m = rt_msg1(cmd, &info)) == NULL) 817 continue; 818 rtm = mtod(m, struct rt_msghdr *); 819 rtm->rtm_index = ifp->if_index; 820 rtm->rtm_flags |= rt->rt_flags; 821 rtm->rtm_errno = error; 822 rtm->rtm_addrs = info.rti_addrs; 823 } 824 route_proto.sp_protocol = sa ? sa->sa_family : 0; 825 raw_input(m, &route_proto, &route_src, &route_dst); 826 } 827 } 828 829 /* 830 * This is the analogue to the rt_newaddrmsg which performs the same 831 * function but for multicast group memberhips. This is easier since 832 * there is no route state to worry about. 833 */ 834 void 835 rt_newmaddrmsg(cmd, ifma) 836 int cmd; 837 struct ifmultiaddr *ifma; 838 { 839 struct rt_addrinfo info; 840 struct mbuf *m = 0; 841 struct ifnet *ifp = ifma->ifma_ifp; 842 struct ifma_msghdr *ifmam; 843 844 if (route_cb.any_count == 0) 845 return; 846 847 bzero((caddr_t)&info, sizeof(info)); 848 ifaaddr = ifma->ifma_addr; 849 if (ifp && TAILQ_FIRST(&ifp->if_addrhead)) 850 ifpaddr = TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr; 851 else 852 ifpaddr = NULL; 853 /* 854 * If a link-layer address is present, present it as a ``gateway'' 855 * (similarly to how ARP entries, e.g., are presented). 856 */ 857 gate = ifma->ifma_lladdr; 858 if ((m = rt_msg1(cmd, &info)) == NULL) 859 return; 860 ifmam = mtod(m, struct ifma_msghdr *); 861 ifmam->ifmam_index = ifp->if_index; 862 ifmam->ifmam_addrs = info.rti_addrs; 863 route_proto.sp_protocol = ifma->ifma_addr->sa_family; 864 raw_input(m, &route_proto, &route_src, &route_dst); 865 } 866 867 /* 868 * This is used in dumping the kernel table via sysctl(). 869 */ 870 int 871 sysctl_dumpentry(rn, vw) 872 struct radix_node *rn; 873 void *vw; 874 { 875 register struct walkarg *w = vw; 876 register struct rtentry *rt = (struct rtentry *)rn; 877 int error = 0, size; 878 struct rt_addrinfo info; 879 880 if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg)) 881 return 0; 882 bzero((caddr_t)&info, sizeof(info)); 883 dst = rt_key(rt); 884 gate = rt->rt_gateway; 885 netmask = rt_mask(rt); 886 genmask = rt->rt_genmask; 887 if (rt->rt_ifp) { 888 ifpaddr = TAILQ_FIRST(&rt->rt_ifp->if_addrhead)->ifa_addr; 889 ifaaddr = rt->rt_ifa->ifa_addr; 890 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT) 891 brdaddr = rt->rt_ifa->ifa_dstaddr; 892 } 893 size = rt_msg2(RTM_GET, &info, 0, w); 894 if (w->w_req && w->w_tmem) { 895 register struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem; 896 897 rtm->rtm_flags = rt->rt_flags; 898 rtm->rtm_use = rt->rt_use; 899 rtm->rtm_rmx = rt->rt_rmx; 900 rtm->rtm_index = rt->rt_ifp->if_index; 901 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0; 902 rtm->rtm_addrs = info.rti_addrs; 903 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size); 904 return (error); 905 } 906 return (error); 907 } 908 909 int 910 sysctl_iflist(af, w) 911 int af; 912 register struct walkarg *w; 913 { 914 register struct ifnet *ifp; 915 register struct ifaddr *ifa; 916 struct rt_addrinfo info; 917 int len, error = 0; 918 919 bzero((caddr_t)&info, sizeof(info)); 920 TAILQ_FOREACH(ifp, &ifnet, if_link) { 921 if (w->w_arg && w->w_arg != ifp->if_index) 922 continue; 923 ifa = TAILQ_FIRST(&ifp->if_addrhead); 924 ifpaddr = ifa->ifa_addr; 925 len = rt_msg2(RTM_IFINFO, &info, (caddr_t)0, w); 926 ifpaddr = 0; 927 if (w->w_req && w->w_tmem) { 928 register struct if_msghdr *ifm; 929 930 ifm = (struct if_msghdr *)w->w_tmem; 931 ifm->ifm_index = ifp->if_index; 932 ifm->ifm_flags = (u_short)ifp->if_flags; 933 ifm->ifm_data = ifp->if_data; 934 ifm->ifm_addrs = info.rti_addrs; 935 error = SYSCTL_OUT(w->w_req,(caddr_t)ifm, len); 936 if (error) 937 goto done; 938 } 939 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != 0) { 940 if (af && af != ifa->ifa_addr->sa_family) 941 continue; 942 if (jailed(curproc->p_ucred) && 943 prison_if(curproc->p_ucred, ifa->ifa_addr)) 944 continue; 945 ifaaddr = ifa->ifa_addr; 946 netmask = ifa->ifa_netmask; 947 brdaddr = ifa->ifa_dstaddr; 948 len = rt_msg2(RTM_NEWADDR, &info, 0, w); 949 if (w->w_req && w->w_tmem) { 950 register struct ifa_msghdr *ifam; 951 952 ifam = (struct ifa_msghdr *)w->w_tmem; 953 ifam->ifam_index = ifa->ifa_ifp->if_index; 954 ifam->ifam_flags = ifa->ifa_flags; 955 ifam->ifam_metric = ifa->ifa_metric; 956 ifam->ifam_addrs = info.rti_addrs; 957 error = SYSCTL_OUT(w->w_req, w->w_tmem, len); 958 if (error) 959 goto done; 960 } 961 } 962 ifaaddr = netmask = brdaddr = 0; 963 } 964 done: 965 return (error); 966 } 967 968 static int 969 sysctl_rtsock(SYSCTL_HANDLER_ARGS) 970 { 971 int *name = (int *)arg1; 972 u_int namelen = arg2; 973 register struct radix_node_head *rnh; 974 int i, s, error = EINVAL; 975 u_char af; 976 struct walkarg w; 977 978 name ++; 979 namelen--; 980 if (req->newptr) 981 return (EPERM); 982 if (namelen != 3) 983 return (EINVAL); 984 af = name[0]; 985 Bzero(&w, sizeof(w)); 986 w.w_op = name[1]; 987 w.w_arg = name[2]; 988 w.w_req = req; 989 990 s = splnet(); 991 switch (w.w_op) { 992 993 case NET_RT_DUMP: 994 case NET_RT_FLAGS: 995 for (i = 1; i <= AF_MAX; i++) 996 if ((rnh = rt_tables[i]) && (af == 0 || af == i) && 997 (error = rnh->rnh_walktree(rnh, 998 sysctl_dumpentry, &w))) 999 break; 1000 break; 1001 1002 case NET_RT_IFLIST: 1003 error = sysctl_iflist(af, &w); 1004 } 1005 splx(s); 1006 if (w.w_tmem) 1007 free(w.w_tmem, M_RTABLE); 1008 return (error); 1009 } 1010 1011 SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, ""); 1012 1013 /* 1014 * Definitions of protocols supported in the ROUTE domain. 1015 */ 1016 1017 extern struct domain routedomain; /* or at least forward */ 1018 1019 static struct protosw routesw[] = { 1020 { SOCK_RAW, &routedomain, 0, PR_ATOMIC|PR_ADDR, 1021 0, route_output, raw_ctlinput, 0, 1022 0, 1023 raw_init, 0, 0, 0, 1024 &route_usrreqs 1025 } 1026 }; 1027 1028 static struct domain routedomain = 1029 { PF_ROUTE, "route", 0, 0, 0, 1030 routesw, &routesw[sizeof(routesw)/sizeof(routesw[0])] }; 1031 1032 DOMAIN_SET(route); 1033