Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net/rtsock.c
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1 /* 2 * Copyright (c) 1988, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 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: releng/5.0/sys/net/rtsock.c 104302 2002-10-01 15:48:31Z phk $ 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(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 /* FALLTHROUGH */ 447 case RTM_LOCK: 448 rt->rt_rmx.rmx_locks &= ~(rtm->rtm_inits); 449 rt->rt_rmx.rmx_locks |= 450 (rtm->rtm_inits & rtm->rtm_rmx.rmx_locks); 451 break; 452 } 453 break; 454 455 default: 456 senderr(EOPNOTSUPP); 457 } 458 459 flush: 460 if (rtm) { 461 if (error) 462 rtm->rtm_errno = error; 463 else 464 rtm->rtm_flags |= RTF_DONE; 465 } 466 if (rt) 467 rtfree(rt); 468 { 469 register struct rawcb *rp = 0; 470 /* 471 * Check to see if we don't want our own messages. 472 */ 473 if ((so->so_options & SO_USELOOPBACK) == 0) { 474 if (route_cb.any_count <= 1) { 475 if (rtm) 476 Free(rtm); 477 m_freem(m); 478 return (error); 479 } 480 /* There is another listener, so construct message */ 481 rp = sotorawcb(so); 482 } 483 if (rtm) { 484 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm); 485 if (m->m_pkthdr.len < rtm->rtm_msglen) { 486 m_freem(m); 487 m = NULL; 488 } else if (m->m_pkthdr.len > rtm->rtm_msglen) 489 m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len); 490 Free(rtm); 491 } 492 if (rp) 493 rp->rcb_proto.sp_family = 0; /* Avoid us */ 494 if (dst) 495 route_proto.sp_protocol = dst->sa_family; 496 if (m) 497 raw_input(m, &route_proto, &route_src, &route_dst); 498 if (rp) 499 rp->rcb_proto.sp_family = PF_ROUTE; 500 } 501 return (error); 502 } 503 504 static void 505 rt_setmetrics(which, in, out) 506 u_long which; 507 register struct rt_metrics *in, *out; 508 { 509 #define metric(f, e) if (which & (f)) out->e = in->e; 510 metric(RTV_RPIPE, rmx_recvpipe); 511 metric(RTV_SPIPE, rmx_sendpipe); 512 metric(RTV_SSTHRESH, rmx_ssthresh); 513 metric(RTV_RTT, rmx_rtt); 514 metric(RTV_RTTVAR, rmx_rttvar); 515 metric(RTV_HOPCOUNT, rmx_hopcount); 516 metric(RTV_MTU, rmx_mtu); 517 metric(RTV_EXPIRE, rmx_expire); 518 #undef metric 519 } 520 521 #define ROUNDUP(a) \ 522 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 523 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 524 525 526 /* 527 * Extract the addresses of the passed sockaddrs. 528 * Do a little sanity checking so as to avoid bad memory references. 529 * This data is derived straight from userland. 530 */ 531 static int 532 rt_xaddrs(cp, cplim, rtinfo) 533 register caddr_t cp, cplim; 534 register struct rt_addrinfo *rtinfo; 535 { 536 register struct sockaddr *sa; 537 register int i; 538 539 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 540 if ((rtinfo->rti_addrs & (1 << i)) == 0) 541 continue; 542 sa = (struct sockaddr *)cp; 543 /* 544 * It won't fit. 545 */ 546 if ( (cp + sa->sa_len) > cplim ) { 547 return (EINVAL); 548 } 549 550 /* 551 * there are no more.. quit now 552 * If there are more bits, they are in error. 553 * I've seen this. route(1) can evidently generate these. 554 * This causes kernel to core dump. 555 * for compatibility, If we see this, point to a safe address. 556 */ 557 if (sa->sa_len == 0) { 558 rtinfo->rti_info[i] = &sa_zero; 559 return (0); /* should be EINVAL but for compat */ 560 } 561 562 /* accept it */ 563 rtinfo->rti_info[i] = sa; 564 ADVANCE(cp, sa); 565 } 566 return (0); 567 } 568 569 static struct mbuf * 570 rt_msg1(type, rtinfo) 571 int type; 572 register struct rt_addrinfo *rtinfo; 573 { 574 register struct rt_msghdr *rtm; 575 register struct mbuf *m; 576 register int i; 577 register struct sockaddr *sa; 578 int len, dlen; 579 580 switch (type) { 581 582 case RTM_DELADDR: 583 case RTM_NEWADDR: 584 len = sizeof(struct ifa_msghdr); 585 break; 586 587 case RTM_DELMADDR: 588 case RTM_NEWMADDR: 589 len = sizeof(struct ifma_msghdr); 590 break; 591 592 case RTM_IFINFO: 593 len = sizeof(struct if_msghdr); 594 break; 595 596 case RTM_IFANNOUNCE: 597 len = sizeof(struct if_announcemsghdr); 598 break; 599 600 default: 601 len = sizeof(struct rt_msghdr); 602 } 603 if (len > MCLBYTES) 604 panic("rt_msg1"); 605 m = m_gethdr(M_DONTWAIT, MT_DATA); 606 if (m && len > MHLEN) { 607 MCLGET(m, M_DONTWAIT); 608 if ((m->m_flags & M_EXT) == 0) { 609 m_free(m); 610 m = NULL; 611 } 612 } 613 if (m == 0) 614 return (m); 615 m->m_pkthdr.len = m->m_len = len; 616 m->m_pkthdr.rcvif = 0; 617 rtm = mtod(m, struct rt_msghdr *); 618 bzero((caddr_t)rtm, len); 619 for (i = 0; i < RTAX_MAX; i++) { 620 if ((sa = rtinfo->rti_info[i]) == NULL) 621 continue; 622 rtinfo->rti_addrs |= (1 << i); 623 dlen = ROUNDUP(sa->sa_len); 624 m_copyback(m, len, dlen, (caddr_t)sa); 625 len += dlen; 626 } 627 if (m->m_pkthdr.len != len) { 628 m_freem(m); 629 return (NULL); 630 } 631 rtm->rtm_msglen = len; 632 rtm->rtm_version = RTM_VERSION; 633 rtm->rtm_type = type; 634 return (m); 635 } 636 637 static int 638 rt_msg2(type, rtinfo, cp, w) 639 int type; 640 register struct rt_addrinfo *rtinfo; 641 caddr_t cp; 642 struct walkarg *w; 643 { 644 register int i; 645 int len, dlen, second_time = 0; 646 caddr_t cp0; 647 648 rtinfo->rti_addrs = 0; 649 again: 650 switch (type) { 651 652 case RTM_DELADDR: 653 case RTM_NEWADDR: 654 len = sizeof(struct ifa_msghdr); 655 break; 656 657 case RTM_IFINFO: 658 len = sizeof(struct if_msghdr); 659 break; 660 661 default: 662 len = sizeof(struct rt_msghdr); 663 } 664 cp0 = cp; 665 if (cp0) 666 cp += len; 667 for (i = 0; i < RTAX_MAX; i++) { 668 register struct sockaddr *sa; 669 670 if ((sa = rtinfo->rti_info[i]) == 0) 671 continue; 672 rtinfo->rti_addrs |= (1 << i); 673 dlen = ROUNDUP(sa->sa_len); 674 if (cp) { 675 bcopy((caddr_t)sa, cp, (unsigned)dlen); 676 cp += dlen; 677 } 678 len += dlen; 679 } 680 len = ALIGN(len); 681 if (cp == 0 && w != NULL && !second_time) { 682 register struct walkarg *rw = w; 683 684 if (rw->w_req) { 685 if (rw->w_tmemsize < len) { 686 if (rw->w_tmem) 687 free(rw->w_tmem, M_RTABLE); 688 rw->w_tmem = (caddr_t) 689 malloc(len, M_RTABLE, M_NOWAIT); 690 if (rw->w_tmem) 691 rw->w_tmemsize = len; 692 } 693 if (rw->w_tmem) { 694 cp = rw->w_tmem; 695 second_time = 1; 696 goto again; 697 } 698 } 699 } 700 if (cp) { 701 register struct rt_msghdr *rtm = (struct rt_msghdr *)cp0; 702 703 rtm->rtm_version = RTM_VERSION; 704 rtm->rtm_type = type; 705 rtm->rtm_msglen = len; 706 } 707 return (len); 708 } 709 710 /* 711 * This routine is called to generate a message from the routing 712 * socket indicating that a redirect has occured, a routing lookup 713 * has failed, or that a protocol has detected timeouts to a particular 714 * destination. 715 */ 716 void 717 rt_missmsg(type, rtinfo, flags, error) 718 int type, flags, error; 719 register struct rt_addrinfo *rtinfo; 720 { 721 register struct rt_msghdr *rtm; 722 register struct mbuf *m; 723 struct sockaddr *sa = rtinfo->rti_info[RTAX_DST]; 724 725 if (route_cb.any_count == 0) 726 return; 727 m = rt_msg1(type, rtinfo); 728 if (m == 0) 729 return; 730 rtm = mtod(m, struct rt_msghdr *); 731 rtm->rtm_flags = RTF_DONE | flags; 732 rtm->rtm_errno = error; 733 rtm->rtm_addrs = rtinfo->rti_addrs; 734 route_proto.sp_protocol = sa ? sa->sa_family : 0; 735 raw_input(m, &route_proto, &route_src, &route_dst); 736 } 737 738 /* 739 * This routine is called to generate a message from the routing 740 * socket indicating that the status of a network interface has changed. 741 */ 742 void 743 rt_ifmsg(ifp) 744 register struct ifnet *ifp; 745 { 746 register struct if_msghdr *ifm; 747 struct mbuf *m; 748 struct rt_addrinfo info; 749 750 if (route_cb.any_count == 0) 751 return; 752 bzero((caddr_t)&info, sizeof(info)); 753 m = rt_msg1(RTM_IFINFO, &info); 754 if (m == 0) 755 return; 756 ifm = mtod(m, struct if_msghdr *); 757 ifm->ifm_index = ifp->if_index; 758 ifm->ifm_flags = ifp->if_flags; 759 ifm->ifm_data = ifp->if_data; 760 ifm->ifm_addrs = 0; 761 route_proto.sp_protocol = 0; 762 raw_input(m, &route_proto, &route_src, &route_dst); 763 } 764 765 /* 766 * This is called to generate messages from the routing socket 767 * indicating a network interface has had addresses associated with it. 768 * if we ever reverse the logic and replace messages TO the routing 769 * socket indicate a request to configure interfaces, then it will 770 * be unnecessary as the routing socket will automatically generate 771 * copies of it. 772 */ 773 void 774 rt_newaddrmsg(cmd, ifa, error, rt) 775 int cmd, error; 776 register struct ifaddr *ifa; 777 register struct rtentry *rt; 778 { 779 struct rt_addrinfo info; 780 struct sockaddr *sa = 0; 781 int pass; 782 struct mbuf *m = 0; 783 struct ifnet *ifp = ifa->ifa_ifp; 784 785 if (route_cb.any_count == 0) 786 return; 787 for (pass = 1; pass < 3; pass++) { 788 bzero((caddr_t)&info, sizeof(info)); 789 if ((cmd == RTM_ADD && pass == 1) || 790 (cmd == RTM_DELETE && pass == 2)) { 791 register struct ifa_msghdr *ifam; 792 int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR; 793 794 ifaaddr = sa = ifa->ifa_addr; 795 ifpaddr = TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr; 796 netmask = ifa->ifa_netmask; 797 brdaddr = ifa->ifa_dstaddr; 798 if ((m = rt_msg1(ncmd, &info)) == NULL) 799 continue; 800 ifam = mtod(m, struct ifa_msghdr *); 801 ifam->ifam_index = ifp->if_index; 802 ifam->ifam_metric = ifa->ifa_metric; 803 ifam->ifam_flags = ifa->ifa_flags; 804 ifam->ifam_addrs = info.rti_addrs; 805 } 806 if ((cmd == RTM_ADD && pass == 2) || 807 (cmd == RTM_DELETE && pass == 1)) { 808 register struct rt_msghdr *rtm; 809 810 if (rt == 0) 811 continue; 812 netmask = rt_mask(rt); 813 dst = sa = rt_key(rt); 814 gate = rt->rt_gateway; 815 if ((m = rt_msg1(cmd, &info)) == NULL) 816 continue; 817 rtm = mtod(m, struct rt_msghdr *); 818 rtm->rtm_index = ifp->if_index; 819 rtm->rtm_flags |= rt->rt_flags; 820 rtm->rtm_errno = error; 821 rtm->rtm_addrs = info.rti_addrs; 822 } 823 route_proto.sp_protocol = sa ? sa->sa_family : 0; 824 raw_input(m, &route_proto, &route_src, &route_dst); 825 } 826 } 827 828 /* 829 * This is the analogue to the rt_newaddrmsg which performs the same 830 * function but for multicast group memberhips. This is easier since 831 * there is no route state to worry about. 832 */ 833 void 834 rt_newmaddrmsg(cmd, ifma) 835 int cmd; 836 struct ifmultiaddr *ifma; 837 { 838 struct rt_addrinfo info; 839 struct mbuf *m = 0; 840 struct ifnet *ifp = ifma->ifma_ifp; 841 struct ifma_msghdr *ifmam; 842 843 if (route_cb.any_count == 0) 844 return; 845 846 bzero((caddr_t)&info, sizeof(info)); 847 ifaaddr = ifma->ifma_addr; 848 if (ifp && TAILQ_FIRST(&ifp->if_addrhead)) 849 ifpaddr = TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr; 850 else 851 ifpaddr = NULL; 852 /* 853 * If a link-layer address is present, present it as a ``gateway'' 854 * (similarly to how ARP entries, e.g., are presented). 855 */ 856 gate = ifma->ifma_lladdr; 857 if ((m = rt_msg1(cmd, &info)) == NULL) 858 return; 859 ifmam = mtod(m, struct ifma_msghdr *); 860 ifmam->ifmam_index = ifp->if_index; 861 ifmam->ifmam_addrs = info.rti_addrs; 862 route_proto.sp_protocol = ifma->ifma_addr->sa_family; 863 raw_input(m, &route_proto, &route_src, &route_dst); 864 } 865 866 /* 867 * This is called to generate routing socket messages indicating 868 * network interface arrival and departure. 869 */ 870 void 871 rt_ifannouncemsg(ifp, what) 872 struct ifnet *ifp; 873 int what; 874 { 875 struct if_announcemsghdr *ifan; 876 struct mbuf *m; 877 struct rt_addrinfo info; 878 879 if (route_cb.any_count == 0) 880 return; 881 bzero((caddr_t)&info, sizeof(info)); 882 m = rt_msg1(RTM_IFANNOUNCE, &info); 883 if (m == NULL) 884 return; 885 ifan = mtod(m, struct if_announcemsghdr *); 886 ifan->ifan_index = ifp->if_index; 887 snprintf(ifan->ifan_name, sizeof(ifan->ifan_name), 888 "%s%d", ifp->if_name, ifp->if_unit); 889 ifan->ifan_what = what; 890 route_proto.sp_protocol = 0; 891 raw_input(m, &route_proto, &route_src, &route_dst); 892 } 893 894 /* 895 * This is used in dumping the kernel table via sysctl(). 896 */ 897 static int 898 sysctl_dumpentry(rn, vw) 899 struct radix_node *rn; 900 void *vw; 901 { 902 register struct walkarg *w = vw; 903 register struct rtentry *rt = (struct rtentry *)rn; 904 int error = 0, size; 905 struct rt_addrinfo info; 906 907 if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg)) 908 return 0; 909 bzero((caddr_t)&info, sizeof(info)); 910 dst = rt_key(rt); 911 gate = rt->rt_gateway; 912 netmask = rt_mask(rt); 913 genmask = rt->rt_genmask; 914 if (rt->rt_ifp) { 915 ifpaddr = TAILQ_FIRST(&rt->rt_ifp->if_addrhead)->ifa_addr; 916 ifaaddr = rt->rt_ifa->ifa_addr; 917 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT) 918 brdaddr = rt->rt_ifa->ifa_dstaddr; 919 } 920 size = rt_msg2(RTM_GET, &info, 0, w); 921 if (w->w_req && w->w_tmem) { 922 register struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem; 923 924 rtm->rtm_flags = rt->rt_flags; 925 rtm->rtm_use = rt->rt_use; 926 rtm->rtm_rmx = rt->rt_rmx; 927 rtm->rtm_index = rt->rt_ifp->if_index; 928 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0; 929 rtm->rtm_addrs = info.rti_addrs; 930 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size); 931 return (error); 932 } 933 return (error); 934 } 935 936 static int 937 sysctl_iflist(af, w) 938 int af; 939 register struct walkarg *w; 940 { 941 register struct ifnet *ifp; 942 register struct ifaddr *ifa; 943 struct rt_addrinfo info; 944 int len, error = 0; 945 946 bzero((caddr_t)&info, sizeof(info)); 947 TAILQ_FOREACH(ifp, &ifnet, if_link) { 948 if (w->w_arg && w->w_arg != ifp->if_index) 949 continue; 950 ifa = TAILQ_FIRST(&ifp->if_addrhead); 951 ifpaddr = ifa->ifa_addr; 952 len = rt_msg2(RTM_IFINFO, &info, (caddr_t)0, w); 953 ifpaddr = 0; 954 if (w->w_req && w->w_tmem) { 955 register struct if_msghdr *ifm; 956 957 ifm = (struct if_msghdr *)w->w_tmem; 958 ifm->ifm_index = ifp->if_index; 959 ifm->ifm_flags = ifp->if_flags; 960 ifm->ifm_data = ifp->if_data; 961 ifm->ifm_addrs = info.rti_addrs; 962 error = SYSCTL_OUT(w->w_req,(caddr_t)ifm, len); 963 if (error) 964 goto done; 965 } 966 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != 0) { 967 if (af && af != ifa->ifa_addr->sa_family) 968 continue; 969 if (jailed(curthread->td_ucred) && 970 prison_if(curthread->td_ucred, ifa->ifa_addr)) 971 continue; 972 ifaaddr = ifa->ifa_addr; 973 netmask = ifa->ifa_netmask; 974 brdaddr = ifa->ifa_dstaddr; 975 len = rt_msg2(RTM_NEWADDR, &info, 0, w); 976 if (w->w_req && w->w_tmem) { 977 register struct ifa_msghdr *ifam; 978 979 ifam = (struct ifa_msghdr *)w->w_tmem; 980 ifam->ifam_index = ifa->ifa_ifp->if_index; 981 ifam->ifam_flags = ifa->ifa_flags; 982 ifam->ifam_metric = ifa->ifa_metric; 983 ifam->ifam_addrs = info.rti_addrs; 984 error = SYSCTL_OUT(w->w_req, w->w_tmem, len); 985 if (error) 986 goto done; 987 } 988 } 989 ifaaddr = netmask = brdaddr = 0; 990 } 991 done: 992 return (error); 993 } 994 995 static int 996 sysctl_rtsock(SYSCTL_HANDLER_ARGS) 997 { 998 int *name = (int *)arg1; 999 u_int namelen = arg2; 1000 register struct radix_node_head *rnh; 1001 int i, s, error = EINVAL; 1002 u_char af; 1003 struct walkarg w; 1004 1005 name ++; 1006 namelen--; 1007 if (req->newptr) 1008 return (EPERM); 1009 if (namelen != 3) 1010 return ((namelen < 3) ? EISDIR : ENOTDIR); 1011 af = name[0]; 1012 Bzero(&w, sizeof(w)); 1013 w.w_op = name[1]; 1014 w.w_arg = name[2]; 1015 w.w_req = req; 1016 1017 s = splnet(); 1018 switch (w.w_op) { 1019 1020 case NET_RT_DUMP: 1021 case NET_RT_FLAGS: 1022 for (i = 1; i <= AF_MAX; i++) 1023 if ((rnh = rt_tables[i]) && (af == 0 || af == i) && 1024 (error = rnh->rnh_walktree(rnh, 1025 sysctl_dumpentry, &w))) 1026 break; 1027 break; 1028 1029 case NET_RT_IFLIST: 1030 error = sysctl_iflist(af, &w); 1031 } 1032 splx(s); 1033 if (w.w_tmem) 1034 free(w.w_tmem, M_RTABLE); 1035 return (error); 1036 } 1037 1038 SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, ""); 1039 1040 /* 1041 * Definitions of protocols supported in the ROUTE domain. 1042 */ 1043 1044 extern struct domain routedomain; /* or at least forward */ 1045 1046 static struct protosw routesw[] = { 1047 { SOCK_RAW, &routedomain, 0, PR_ATOMIC|PR_ADDR, 1048 0, route_output, raw_ctlinput, 0, 1049 0, 1050 raw_init, 0, 0, 0, 1051 &route_usrreqs 1052 } 1053 }; 1054 1055 static struct domain routedomain = 1056 { PF_ROUTE, "route", 0, 0, 0, 1057 routesw, &routesw[sizeof(routesw)/sizeof(routesw[0])] }; 1058 1059 DOMAIN_SET(route);
Cache object: 505a399389996e7d8eca9c80378e249f
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