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 * $FreeBSD$ 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 50 #include <net/if.h> 51 #include <net/route.h> 52 #include <net/raw_cb.h> 53 54 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables"); 55 56 static struct sockaddr route_dst = { 2, PF_ROUTE, }; 57 static struct sockaddr route_src = { 2, PF_ROUTE, }; 58 static struct sockaddr sa_zero = { sizeof(sa_zero), AF_INET, }; 59 static struct sockproto route_proto = { PF_ROUTE, }; 60 61 struct walkarg { 62 int w_tmemsize; 63 int w_op, w_arg; 64 caddr_t w_tmem; 65 struct sysctl_req *w_req; 66 }; 67 68 static struct mbuf * 69 rt_msg1 __P((int, struct rt_addrinfo *)); 70 static int rt_msg2 __P((int, 71 struct rt_addrinfo *, caddr_t, struct walkarg *)); 72 static int rt_xaddrs __P((caddr_t, caddr_t, struct rt_addrinfo *)); 73 static int sysctl_dumpentry __P((struct radix_node *rn, void *vw)); 74 static int sysctl_iflist __P((int af, struct walkarg *w)); 75 static int route_output __P((struct mbuf *, struct socket *)); 76 static void rt_setmetrics __P((u_long, struct rt_metrics *, struct rt_metrics *)); 77 78 /* Sleazy use of local variables throughout file, warning!!!! */ 79 #define dst info.rti_info[RTAX_DST] 80 #define gate info.rti_info[RTAX_GATEWAY] 81 #define netmask info.rti_info[RTAX_NETMASK] 82 #define genmask info.rti_info[RTAX_GENMASK] 83 #define ifpaddr info.rti_info[RTAX_IFP] 84 #define ifaaddr info.rti_info[RTAX_IFA] 85 #define brdaddr info.rti_info[RTAX_BRD] 86 87 /* 88 * It really doesn't make any sense at all for this code to share much 89 * with raw_usrreq.c, since its functionality is so restricted. XXX 90 */ 91 static int 92 rts_abort(struct socket *so) 93 { 94 int s, error; 95 s = splnet(); 96 error = raw_usrreqs.pru_abort(so); 97 splx(s); 98 return error; 99 } 100 101 /* pru_accept is EOPNOTSUPP */ 102 103 static int 104 rts_attach(struct socket *so, int proto, struct proc *p) 105 { 106 struct rawcb *rp; 107 int s, error; 108 109 if (sotorawcb(so) != 0) 110 return EISCONN; /* XXX panic? */ 111 MALLOC(rp, struct rawcb *, sizeof *rp, M_PCB, M_WAITOK|M_ZERO); 112 if (rp == 0) 113 return ENOBUFS; 114 115 /* 116 * The splnet() is necessary to block protocols from sending 117 * error notifications (like RTM_REDIRECT or RTM_LOSING) while 118 * this PCB is extant but incompletely initialized. 119 * Probably we should try to do more of this work beforehand and 120 * eliminate the spl. 121 */ 122 s = splnet(); 123 so->so_pcb = (caddr_t)rp; 124 error = raw_attach(so, proto); 125 rp = sotorawcb(so); 126 if (error) { 127 splx(s); 128 free(rp, M_PCB); 129 return error; 130 } 131 switch(rp->rcb_proto.sp_protocol) { 132 case AF_INET: 133 route_cb.ip_count++; 134 break; 135 case AF_INET6: 136 route_cb.ip6_count++; 137 break; 138 case AF_IPX: 139 route_cb.ipx_count++; 140 break; 141 case AF_NS: 142 route_cb.ns_count++; 143 break; 144 } 145 rp->rcb_faddr = &route_src; 146 route_cb.any_count++; 147 soisconnected(so); 148 so->so_options |= SO_USELOOPBACK; 149 splx(s); 150 return 0; 151 } 152 153 static int 154 rts_bind(struct socket *so, struct sockaddr *nam, struct proc *p) 155 { 156 int s, error; 157 s = splnet(); 158 error = raw_usrreqs.pru_bind(so, nam, p); /* xxx just EINVAL */ 159 splx(s); 160 return error; 161 } 162 163 static int 164 rts_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 165 { 166 int s, error; 167 s = splnet(); 168 error = raw_usrreqs.pru_connect(so, nam, p); /* XXX just EINVAL */ 169 splx(s); 170 return error; 171 } 172 173 /* pru_connect2 is EOPNOTSUPP */ 174 /* pru_control is EOPNOTSUPP */ 175 176 static int 177 rts_detach(struct socket *so) 178 { 179 struct rawcb *rp = sotorawcb(so); 180 int s, error; 181 182 s = splnet(); 183 if (rp != 0) { 184 switch(rp->rcb_proto.sp_protocol) { 185 case AF_INET: 186 route_cb.ip_count--; 187 break; 188 case AF_INET6: 189 route_cb.ip6_count--; 190 break; 191 case AF_IPX: 192 route_cb.ipx_count--; 193 break; 194 case AF_NS: 195 route_cb.ns_count--; 196 break; 197 } 198 route_cb.any_count--; 199 } 200 error = raw_usrreqs.pru_detach(so); 201 splx(s); 202 return error; 203 } 204 205 static int 206 rts_disconnect(struct socket *so) 207 { 208 int s, error; 209 s = splnet(); 210 error = raw_usrreqs.pru_disconnect(so); 211 splx(s); 212 return error; 213 } 214 215 /* pru_listen is EOPNOTSUPP */ 216 217 static int 218 rts_peeraddr(struct socket *so, struct sockaddr **nam) 219 { 220 int s, error; 221 s = splnet(); 222 error = raw_usrreqs.pru_peeraddr(so, nam); 223 splx(s); 224 return error; 225 } 226 227 /* pru_rcvd is EOPNOTSUPP */ 228 /* pru_rcvoob is EOPNOTSUPP */ 229 230 static int 231 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, 232 struct mbuf *control, struct proc *p) 233 { 234 int s, error; 235 s = splnet(); 236 error = raw_usrreqs.pru_send(so, flags, m, nam, control, p); 237 splx(s); 238 return error; 239 } 240 241 /* pru_sense is null */ 242 243 static int 244 rts_shutdown(struct socket *so) 245 { 246 int s, error; 247 s = splnet(); 248 error = raw_usrreqs.pru_shutdown(so); 249 splx(s); 250 return error; 251 } 252 253 static int 254 rts_sockaddr(struct socket *so, struct sockaddr **nam) 255 { 256 int s, error; 257 s = splnet(); 258 error = raw_usrreqs.pru_sockaddr(so, nam); 259 splx(s); 260 return error; 261 } 262 263 static struct pr_usrreqs route_usrreqs = { 264 rts_abort, pru_accept_notsupp, rts_attach, rts_bind, rts_connect, 265 pru_connect2_notsupp, pru_control_notsupp, rts_detach, rts_disconnect, 266 pru_listen_notsupp, rts_peeraddr, pru_rcvd_notsupp, pru_rcvoob_notsupp, 267 rts_send, pru_sense_null, rts_shutdown, rts_sockaddr, 268 sosend, soreceive, sopoll 269 }; 270 271 /*ARGSUSED*/ 272 static int 273 route_output(m, so) 274 register struct mbuf *m; 275 struct socket *so; 276 { 277 register struct rt_msghdr *rtm = 0; 278 register struct rtentry *rt = 0; 279 struct rtentry *saved_nrt = 0; 280 struct radix_node_head *rnh; 281 struct rt_addrinfo info; 282 int len, error = 0; 283 struct ifnet *ifp = 0; 284 struct ifaddr *ifa = 0; 285 286 #define senderr(e) { error = e; goto flush;} 287 if (m == 0 || ((m->m_len < sizeof(long)) && 288 (m = m_pullup(m, sizeof(long))) == 0)) 289 return (ENOBUFS); 290 if ((m->m_flags & M_PKTHDR) == 0) 291 panic("route_output"); 292 len = m->m_pkthdr.len; 293 if (len < sizeof(*rtm) || 294 len != mtod(m, struct rt_msghdr *)->rtm_msglen) { 295 dst = 0; 296 senderr(EINVAL); 297 } 298 R_Malloc(rtm, struct rt_msghdr *, len); 299 if (rtm == 0) { 300 dst = 0; 301 senderr(ENOBUFS); 302 } 303 m_copydata(m, 0, len, (caddr_t)rtm); 304 if (rtm->rtm_version != RTM_VERSION) { 305 dst = 0; 306 senderr(EPROTONOSUPPORT); 307 } 308 rtm->rtm_pid = curproc->p_pid; 309 bzero(&info, sizeof(info)); 310 info.rti_addrs = rtm->rtm_addrs; 311 if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info)) { 312 dst = 0; 313 senderr(EINVAL); 314 } 315 info.rti_flags = rtm->rtm_flags; 316 if (dst == 0 || (dst->sa_family >= AF_MAX) 317 || (gate != 0 && (gate->sa_family >= AF_MAX))) 318 senderr(EINVAL); 319 if (genmask) { 320 struct radix_node *t; 321 t = rn_addmask((caddr_t)genmask, 0, 1); 322 if (t && Bcmp((caddr_t)genmask + 1, (caddr_t)t->rn_key + 1, 323 *(u_char *)t->rn_key - 1) == 0) 324 genmask = (struct sockaddr *)(t->rn_key); 325 else 326 senderr(ENOBUFS); 327 } 328 329 /* 330 * Verify that the caller has the appropriate privilege; RTM_GET 331 * is the only operation the non-superuser is allowed. 332 */ 333 if (rtm->rtm_type != RTM_GET && (error = suser(curproc)) != 0) 334 senderr(error); 335 336 switch (rtm->rtm_type) { 337 338 case RTM_ADD: 339 if (gate == 0) 340 senderr(EINVAL); 341 error = rtrequest1(RTM_ADD, &info, &saved_nrt); 342 if (error == 0 && saved_nrt) { 343 rt_setmetrics(rtm->rtm_inits, 344 &rtm->rtm_rmx, &saved_nrt->rt_rmx); 345 saved_nrt->rt_rmx.rmx_locks &= ~(rtm->rtm_inits); 346 saved_nrt->rt_rmx.rmx_locks |= 347 (rtm->rtm_inits & rtm->rtm_rmx.rmx_locks); 348 saved_nrt->rt_refcnt--; 349 saved_nrt->rt_genmask = genmask; 350 } 351 break; 352 353 case RTM_DELETE: 354 error = rtrequest1(RTM_DELETE, &info, &saved_nrt); 355 if (error == 0) { 356 if ((rt = saved_nrt)) 357 rt->rt_refcnt++; 358 goto report; 359 } 360 break; 361 362 case RTM_GET: 363 case RTM_CHANGE: 364 case RTM_LOCK: 365 if ((rnh = rt_tables[dst->sa_family]) == 0) { 366 senderr(EAFNOSUPPORT); 367 } else if ((rt = (struct rtentry *) 368 rnh->rnh_lookup(dst, netmask, rnh)) != NULL) 369 rt->rt_refcnt++; 370 else 371 senderr(ESRCH); 372 switch(rtm->rtm_type) { 373 374 case RTM_GET: 375 report: 376 dst = rt_key(rt); 377 gate = rt->rt_gateway; 378 netmask = rt_mask(rt); 379 genmask = rt->rt_genmask; 380 if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) { 381 ifp = rt->rt_ifp; 382 if (ifp) { 383 ifpaddr = TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr; 384 ifaaddr = rt->rt_ifa->ifa_addr; 385 if (ifp->if_flags & IFF_POINTOPOINT) 386 brdaddr = rt->rt_ifa->ifa_dstaddr; 387 rtm->rtm_index = ifp->if_index; 388 } else { 389 ifpaddr = 0; 390 ifaaddr = 0; 391 } 392 } 393 len = rt_msg2(rtm->rtm_type, &info, (caddr_t)0, 394 (struct walkarg *)0); 395 if (len > rtm->rtm_msglen) { 396 struct rt_msghdr *new_rtm; 397 R_Malloc(new_rtm, struct rt_msghdr *, len); 398 if (new_rtm == 0) 399 senderr(ENOBUFS); 400 Bcopy(rtm, new_rtm, rtm->rtm_msglen); 401 Free(rtm); rtm = new_rtm; 402 } 403 (void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm, 404 (struct walkarg *)0); 405 rtm->rtm_flags = rt->rt_flags; 406 rtm->rtm_rmx = rt->rt_rmx; 407 rtm->rtm_addrs = info.rti_addrs; 408 break; 409 410 case RTM_CHANGE: 411 /* new gateway could require new ifaddr, ifp; 412 flags may also be different; ifp may be specified 413 by ll sockaddr when protocol address is ambiguous */ 414 #define equal(a1, a2) (bcmp((caddr_t)(a1), (caddr_t)(a2), (a1)->sa_len) == 0) 415 if ((rt->rt_flags & RTF_GATEWAY && gate != NULL) || 416 ifpaddr != NULL || 417 (ifaaddr != NULL && 418 !equal(ifaaddr, rt->rt_ifa->ifa_addr))) { 419 if ((error = rt_getifa(&info)) != 0) 420 senderr(error); 421 } 422 if (gate != NULL && 423 (error = rt_setgate(rt, rt_key(rt), gate)) != 0) 424 senderr(error); 425 if ((ifa = info.rti_ifa) != NULL) { 426 register struct ifaddr *oifa = rt->rt_ifa; 427 if (oifa != ifa) { 428 if (oifa && oifa->ifa_rtrequest) 429 oifa->ifa_rtrequest(RTM_DELETE, rt, 430 &info); 431 IFAFREE(rt->rt_ifa); 432 rt->rt_ifa = ifa; 433 ifa->ifa_refcnt++; 434 rt->rt_ifp = info.rti_ifp; 435 } 436 } 437 rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx, 438 &rt->rt_rmx); 439 if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest) 440 rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info); 441 if (genmask) 442 rt->rt_genmask = genmask; 443 /* 444 * Fall into 445 */ 446 case RTM_LOCK: 447 rt->rt_rmx.rmx_locks &= ~(rtm->rtm_inits); 448 rt->rt_rmx.rmx_locks |= 449 (rtm->rtm_inits & rtm->rtm_rmx.rmx_locks); 450 break; 451 } 452 break; 453 454 default: 455 senderr(EOPNOTSUPP); 456 } 457 458 flush: 459 if (rtm) { 460 if (error) 461 rtm->rtm_errno = error; 462 else 463 rtm->rtm_flags |= RTF_DONE; 464 } 465 if (rt) 466 rtfree(rt); 467 { 468 register struct rawcb *rp = 0; 469 /* 470 * Check to see if we don't want our own messages. 471 */ 472 if ((so->so_options & SO_USELOOPBACK) == 0) { 473 if (route_cb.any_count <= 1) { 474 if (rtm) 475 Free(rtm); 476 m_freem(m); 477 return (error); 478 } 479 /* There is another listener, so construct message */ 480 rp = sotorawcb(so); 481 } 482 if (rtm) { 483 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm); 484 if (m->m_pkthdr.len < rtm->rtm_msglen) { 485 m_freem(m); 486 m = NULL; 487 } else if (m->m_pkthdr.len > rtm->rtm_msglen) 488 m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len); 489 Free(rtm); 490 } 491 if (rp) 492 rp->rcb_proto.sp_family = 0; /* Avoid us */ 493 if (dst) 494 route_proto.sp_protocol = dst->sa_family; 495 if (m) 496 raw_input(m, &route_proto, &route_src, &route_dst); 497 if (rp) 498 rp->rcb_proto.sp_family = PF_ROUTE; 499 } 500 return (error); 501 } 502 503 static void 504 rt_setmetrics(which, in, out) 505 u_long which; 506 register struct rt_metrics *in, *out; 507 { 508 #define metric(f, e) if (which & (f)) out->e = in->e; 509 metric(RTV_RPIPE, rmx_recvpipe); 510 metric(RTV_SPIPE, rmx_sendpipe); 511 metric(RTV_SSTHRESH, rmx_ssthresh); 512 metric(RTV_RTT, rmx_rtt); 513 metric(RTV_RTTVAR, rmx_rttvar); 514 metric(RTV_HOPCOUNT, rmx_hopcount); 515 metric(RTV_MTU, rmx_mtu); 516 metric(RTV_EXPIRE, rmx_expire); 517 #undef metric 518 } 519 520 #define ROUNDUP(a) \ 521 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 522 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 523 524 525 /* 526 * Extract the addresses of the passed sockaddrs. 527 * Do a little sanity checking so as to avoid bad memory references. 528 * This data is derived straight from userland. 529 */ 530 static int 531 rt_xaddrs(cp, cplim, rtinfo) 532 register caddr_t cp, cplim; 533 register struct rt_addrinfo *rtinfo; 534 { 535 register struct sockaddr *sa; 536 register int i; 537 538 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 539 if ((rtinfo->rti_addrs & (1 << i)) == 0) 540 continue; 541 sa = (struct sockaddr *)cp; 542 /* 543 * It won't fit. 544 */ 545 if ( (cp + sa->sa_len) > cplim ) { 546 return (EINVAL); 547 } 548 549 /* 550 * there are no more.. quit now 551 * If there are more bits, they are in error. 552 * I've seen this. route(1) can evidently generate these. 553 * This causes kernel to core dump. 554 * for compatibility, If we see this, point to a safe address. 555 */ 556 if (sa->sa_len == 0) { 557 rtinfo->rti_info[i] = &sa_zero; 558 return (0); /* should be EINVAL but for compat */ 559 } 560 561 /* accept it */ 562 rtinfo->rti_info[i] = sa; 563 ADVANCE(cp, sa); 564 } 565 return (0); 566 } 567 568 static struct mbuf * 569 rt_msg1(type, rtinfo) 570 int type; 571 register struct rt_addrinfo *rtinfo; 572 { 573 register struct rt_msghdr *rtm; 574 register struct mbuf *m; 575 register int i; 576 register struct sockaddr *sa; 577 int len, dlen; 578 579 switch (type) { 580 581 case RTM_DELADDR: 582 case RTM_NEWADDR: 583 len = sizeof(struct ifa_msghdr); 584 break; 585 586 case RTM_DELMADDR: 587 case RTM_NEWMADDR: 588 len = sizeof(struct ifma_msghdr); 589 break; 590 591 case RTM_IFINFO: 592 len = sizeof(struct if_msghdr); 593 break; 594 595 case RTM_IFANNOUNCE: 596 len = sizeof(struct if_announcemsghdr); 597 break; 598 599 default: 600 len = sizeof(struct rt_msghdr); 601 } 602 if (len > MCLBYTES) 603 panic("rt_msg1"); 604 m = m_gethdr(M_DONTWAIT, MT_DATA); 605 if (m && len > MHLEN) { 606 MCLGET(m, M_DONTWAIT); 607 if ((m->m_flags & M_EXT) == 0) { 608 m_free(m); 609 m = NULL; 610 } 611 } 612 if (m == 0) 613 return (m); 614 m->m_pkthdr.len = m->m_len = len; 615 m->m_pkthdr.rcvif = 0; 616 rtm = mtod(m, struct rt_msghdr *); 617 bzero((caddr_t)rtm, len); 618 for (i = 0; i < RTAX_MAX; i++) { 619 if ((sa = rtinfo->rti_info[i]) == NULL) 620 continue; 621 rtinfo->rti_addrs |= (1 << i); 622 dlen = ROUNDUP(sa->sa_len); 623 m_copyback(m, len, dlen, (caddr_t)sa); 624 len += dlen; 625 } 626 if (m->m_pkthdr.len != len) { 627 m_freem(m); 628 return (NULL); 629 } 630 rtm->rtm_msglen = len; 631 rtm->rtm_version = RTM_VERSION; 632 rtm->rtm_type = type; 633 return (m); 634 } 635 636 static int 637 rt_msg2(type, rtinfo, cp, w) 638 int type; 639 register struct rt_addrinfo *rtinfo; 640 caddr_t cp; 641 struct walkarg *w; 642 { 643 register int i; 644 int len, dlen, second_time = 0; 645 caddr_t cp0; 646 647 rtinfo->rti_addrs = 0; 648 again: 649 switch (type) { 650 651 case RTM_DELADDR: 652 case RTM_NEWADDR: 653 len = sizeof(struct ifa_msghdr); 654 break; 655 656 case RTM_IFINFO: 657 len = sizeof(struct if_msghdr); 658 break; 659 660 default: 661 len = sizeof(struct rt_msghdr); 662 } 663 cp0 = cp; 664 if (cp0) 665 cp += len; 666 for (i = 0; i < RTAX_MAX; i++) { 667 register struct sockaddr *sa; 668 669 if ((sa = rtinfo->rti_info[i]) == 0) 670 continue; 671 rtinfo->rti_addrs |= (1 << i); 672 dlen = ROUNDUP(sa->sa_len); 673 if (cp) { 674 bcopy((caddr_t)sa, cp, (unsigned)dlen); 675 cp += dlen; 676 } 677 len += dlen; 678 } 679 len = ALIGN(len); 680 if (cp == 0 && w != NULL && !second_time) { 681 register struct walkarg *rw = w; 682 683 if (rw->w_req) { 684 if (rw->w_tmemsize < len) { 685 if (rw->w_tmem) 686 free(rw->w_tmem, M_RTABLE); 687 rw->w_tmem = (caddr_t) 688 malloc(len, M_RTABLE, M_NOWAIT); 689 if (rw->w_tmem) 690 rw->w_tmemsize = len; 691 } 692 if (rw->w_tmem) { 693 cp = rw->w_tmem; 694 second_time = 1; 695 goto again; 696 } 697 } 698 } 699 if (cp) { 700 register struct rt_msghdr *rtm = (struct rt_msghdr *)cp0; 701 702 rtm->rtm_version = RTM_VERSION; 703 rtm->rtm_type = type; 704 rtm->rtm_msglen = len; 705 } 706 return (len); 707 } 708 709 /* 710 * This routine is called to generate a message from the routing 711 * socket indicating that a redirect has occured, a routing lookup 712 * has failed, or that a protocol has detected timeouts to a particular 713 * destination. 714 */ 715 void 716 rt_missmsg(type, rtinfo, flags, error) 717 int type, flags, error; 718 register struct rt_addrinfo *rtinfo; 719 { 720 register struct rt_msghdr *rtm; 721 register struct mbuf *m; 722 struct sockaddr *sa = rtinfo->rti_info[RTAX_DST]; 723 724 if (route_cb.any_count == 0) 725 return; 726 m = rt_msg1(type, rtinfo); 727 if (m == 0) 728 return; 729 rtm = mtod(m, struct rt_msghdr *); 730 rtm->rtm_flags = RTF_DONE | flags; 731 rtm->rtm_errno = error; 732 rtm->rtm_addrs = rtinfo->rti_addrs; 733 route_proto.sp_protocol = sa ? sa->sa_family : 0; 734 raw_input(m, &route_proto, &route_src, &route_dst); 735 } 736 737 /* 738 * This routine is called to generate a message from the routing 739 * socket indicating that the status of a network interface has changed. 740 */ 741 void 742 rt_ifmsg(ifp) 743 register struct ifnet *ifp; 744 { 745 register struct if_msghdr *ifm; 746 struct mbuf *m; 747 struct rt_addrinfo info; 748 749 if (route_cb.any_count == 0) 750 return; 751 bzero((caddr_t)&info, sizeof(info)); 752 m = rt_msg1(RTM_IFINFO, &info); 753 if (m == 0) 754 return; 755 ifm = mtod(m, struct if_msghdr *); 756 ifm->ifm_index = ifp->if_index; 757 ifm->ifm_flags = (ifp->if_ipending & ~0xffff) | (u_short)ifp->if_flags; 758 ifm->ifm_data = ifp->if_data; 759 ifm->ifm_addrs = 0; 760 route_proto.sp_protocol = 0; 761 raw_input(m, &route_proto, &route_src, &route_dst); 762 } 763 764 /* 765 * This is called to generate messages from the routing socket 766 * indicating a network interface has had addresses associated with it. 767 * if we ever reverse the logic and replace messages TO the routing 768 * socket indicate a request to configure interfaces, then it will 769 * be unnecessary as the routing socket will automatically generate 770 * copies of it. 771 */ 772 void 773 rt_newaddrmsg(cmd, ifa, error, rt) 774 int cmd, error; 775 register struct ifaddr *ifa; 776 register struct rtentry *rt; 777 { 778 struct rt_addrinfo info; 779 struct sockaddr *sa = 0; 780 int pass; 781 struct mbuf *m = 0; 782 struct ifnet *ifp = ifa->ifa_ifp; 783 784 if (route_cb.any_count == 0) 785 return; 786 for (pass = 1; pass < 3; pass++) { 787 bzero((caddr_t)&info, sizeof(info)); 788 if ((cmd == RTM_ADD && pass == 1) || 789 (cmd == RTM_DELETE && pass == 2)) { 790 register struct ifa_msghdr *ifam; 791 int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR; 792 793 ifaaddr = sa = ifa->ifa_addr; 794 ifpaddr = TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr; 795 netmask = ifa->ifa_netmask; 796 brdaddr = ifa->ifa_dstaddr; 797 if ((m = rt_msg1(ncmd, &info)) == NULL) 798 continue; 799 ifam = mtod(m, struct ifa_msghdr *); 800 ifam->ifam_index = ifp->if_index; 801 ifam->ifam_metric = ifa->ifa_metric; 802 ifam->ifam_flags = ifa->ifa_flags; 803 ifam->ifam_addrs = info.rti_addrs; 804 } 805 if ((cmd == RTM_ADD && pass == 2) || 806 (cmd == RTM_DELETE && pass == 1)) { 807 register struct rt_msghdr *rtm; 808 809 if (rt == 0) 810 continue; 811 netmask = rt_mask(rt); 812 dst = sa = rt_key(rt); 813 gate = rt->rt_gateway; 814 if ((m = rt_msg1(cmd, &info)) == NULL) 815 continue; 816 rtm = mtod(m, struct rt_msghdr *); 817 rtm->rtm_index = ifp->if_index; 818 rtm->rtm_flags |= rt->rt_flags; 819 rtm->rtm_errno = error; 820 rtm->rtm_addrs = info.rti_addrs; 821 } 822 route_proto.sp_protocol = sa ? sa->sa_family : 0; 823 raw_input(m, &route_proto, &route_src, &route_dst); 824 } 825 } 826 827 /* 828 * This is the analogue to the rt_newaddrmsg which performs the same 829 * function but for multicast group memberhips. This is easier since 830 * there is no route state to worry about. 831 */ 832 void 833 rt_newmaddrmsg(cmd, ifma) 834 int cmd; 835 struct ifmultiaddr *ifma; 836 { 837 struct rt_addrinfo info; 838 struct mbuf *m = 0; 839 struct ifnet *ifp = ifma->ifma_ifp; 840 struct ifma_msghdr *ifmam; 841 842 if (route_cb.any_count == 0) 843 return; 844 845 bzero((caddr_t)&info, sizeof(info)); 846 ifaaddr = ifma->ifma_addr; 847 if (ifp && TAILQ_FIRST(&ifp->if_addrhead)) 848 ifpaddr = TAILQ_FIRST(&ifp->if_addrhead)->ifa_addr; 849 else 850 ifpaddr = NULL; 851 /* 852 * If a link-layer address is present, present it as a ``gateway'' 853 * (similarly to how ARP entries, e.g., are presented). 854 */ 855 gate = ifma->ifma_lladdr; 856 if ((m = rt_msg1(cmd, &info)) == NULL) 857 return; 858 ifmam = mtod(m, struct ifma_msghdr *); 859 ifmam->ifmam_index = ifp->if_index; 860 ifmam->ifmam_addrs = info.rti_addrs; 861 route_proto.sp_protocol = ifma->ifma_addr->sa_family; 862 raw_input(m, &route_proto, &route_src, &route_dst); 863 } 864 865 /* 866 * This is called to generate routing socket messages indicating 867 * network interface arrival and departure. 868 */ 869 void 870 rt_ifannouncemsg(ifp, what) 871 struct ifnet *ifp; 872 int what; 873 { 874 struct if_announcemsghdr *ifan; 875 struct mbuf *m; 876 struct rt_addrinfo info; 877 878 if (route_cb.any_count == 0) 879 return; 880 bzero((caddr_t)&info, sizeof(info)); 881 m = rt_msg1(RTM_IFANNOUNCE, &info); 882 if (m == NULL) 883 return; 884 ifan = mtod(m, struct if_announcemsghdr *); 885 ifan->ifan_index = ifp->if_index; 886 snprintf(ifan->ifan_name, sizeof(ifan->ifan_name), 887 "%s%d", ifp->if_name, ifp->if_unit); 888 ifan->ifan_what = what; 889 route_proto.sp_protocol = 0; 890 raw_input(m, &route_proto, &route_src, &route_dst); 891 } 892 893 /* 894 * This is used in dumping the kernel table via sysctl(). 895 */ 896 int 897 sysctl_dumpentry(rn, vw) 898 struct radix_node *rn; 899 void *vw; 900 { 901 register struct walkarg *w = vw; 902 register struct rtentry *rt = (struct rtentry *)rn; 903 int error = 0, size; 904 struct rt_addrinfo info; 905 906 if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg)) 907 return 0; 908 bzero((caddr_t)&info, sizeof(info)); 909 dst = rt_key(rt); 910 gate = rt->rt_gateway; 911 netmask = rt_mask(rt); 912 genmask = rt->rt_genmask; 913 if (rt->rt_ifp) { 914 ifpaddr = TAILQ_FIRST(&rt->rt_ifp->if_addrhead)->ifa_addr; 915 ifaaddr = rt->rt_ifa->ifa_addr; 916 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT) 917 brdaddr = rt->rt_ifa->ifa_dstaddr; 918 } 919 size = rt_msg2(RTM_GET, &info, 0, w); 920 if (w->w_req && w->w_tmem) { 921 register struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem; 922 923 rtm->rtm_flags = rt->rt_flags; 924 rtm->rtm_use = rt->rt_use; 925 rtm->rtm_rmx = rt->rt_rmx; 926 rtm->rtm_index = rt->rt_ifp->if_index; 927 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0; 928 rtm->rtm_addrs = info.rti_addrs; 929 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size); 930 return (error); 931 } 932 return (error); 933 } 934 935 int 936 sysctl_iflist(af, w) 937 int af; 938 register struct walkarg *w; 939 { 940 register struct ifnet *ifp; 941 register struct ifaddr *ifa; 942 struct rt_addrinfo info; 943 int len, error = 0; 944 945 bzero((caddr_t)&info, sizeof(info)); 946 TAILQ_FOREACH(ifp, &ifnet, if_link) { 947 if (w->w_arg && w->w_arg != ifp->if_index) 948 continue; 949 ifa = TAILQ_FIRST(&ifp->if_addrhead); 950 ifpaddr = ifa->ifa_addr; 951 len = rt_msg2(RTM_IFINFO, &info, (caddr_t)0, w); 952 ifpaddr = 0; 953 if (w->w_req && w->w_tmem) { 954 register struct if_msghdr *ifm; 955 956 ifm = (struct if_msghdr *)w->w_tmem; 957 ifm->ifm_index = ifp->if_index; 958 ifm->ifm_flags = (ifp->if_ipending & ~0xffff) | 959 (u_short)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 return (error); 965 } 966 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != 0) { 967 if (af && af != ifa->ifa_addr->sa_family) 968 continue; 969 if (curproc->p_prison && prison_if(curproc, ifa->ifa_addr)) 970 continue; 971 ifaaddr = ifa->ifa_addr; 972 netmask = ifa->ifa_netmask; 973 brdaddr = ifa->ifa_dstaddr; 974 len = rt_msg2(RTM_NEWADDR, &info, 0, w); 975 if (w->w_req && w->w_tmem) { 976 register struct ifa_msghdr *ifam; 977 978 ifam = (struct ifa_msghdr *)w->w_tmem; 979 ifam->ifam_index = ifa->ifa_ifp->if_index; 980 ifam->ifam_flags = ifa->ifa_flags; 981 ifam->ifam_metric = ifa->ifa_metric; 982 ifam->ifam_addrs = info.rti_addrs; 983 error = SYSCTL_OUT(w->w_req, w->w_tmem, len); 984 if (error) 985 return (error); 986 } 987 } 988 ifaaddr = netmask = brdaddr = 0; 989 } 990 return (0); 991 } 992 993 static int 994 sysctl_rtsock(SYSCTL_HANDLER_ARGS) 995 { 996 int *name = (int *)arg1; 997 u_int namelen = arg2; 998 register struct radix_node_head *rnh; 999 int i, s, error = EINVAL; 1000 u_char af; 1001 struct walkarg w; 1002 1003 name ++; 1004 namelen--; 1005 if (req->newptr) 1006 return (EPERM); 1007 if (namelen != 3) 1008 return (EINVAL); 1009 af = name[0]; 1010 Bzero(&w, sizeof(w)); 1011 w.w_op = name[1]; 1012 w.w_arg = name[2]; 1013 w.w_req = req; 1014 1015 s = splnet(); 1016 switch (w.w_op) { 1017 1018 case NET_RT_DUMP: 1019 case NET_RT_FLAGS: 1020 for (i = 1; i <= AF_MAX; i++) 1021 if ((rnh = rt_tables[i]) && (af == 0 || af == i) && 1022 (error = rnh->rnh_walktree(rnh, 1023 sysctl_dumpentry, &w))) 1024 break; 1025 break; 1026 1027 case NET_RT_IFLIST: 1028 error = sysctl_iflist(af, &w); 1029 } 1030 splx(s); 1031 if (w.w_tmem) 1032 free(w.w_tmem, M_RTABLE); 1033 return (error); 1034 } 1035 1036 SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, ""); 1037 1038 /* 1039 * Definitions of protocols supported in the ROUTE domain. 1040 */ 1041 1042 extern struct domain routedomain; /* or at least forward */ 1043 1044 static struct protosw routesw[] = { 1045 { SOCK_RAW, &routedomain, 0, PR_ATOMIC|PR_ADDR, 1046 0, route_output, raw_ctlinput, 0, 1047 0, 1048 raw_init, 0, 0, 0, 1049 &route_usrreqs 1050 } 1051 }; 1052 1053 static struct domain routedomain = 1054 { PF_ROUTE, "route", 0, 0, 0, 1055 routesw, &routesw[sizeof(routesw)/sizeof(routesw[0])] }; 1056 1057 DOMAIN_SET(route);
Cache object: 510ab2f8d57daf5750815768659edd56
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