Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netatalk/at_control.c
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1 /*- 2 * Copyright (c) 1990,1991 Regents of The University of Michigan. 3 * All Rights Reserved. 4 * 5 * Permission to use, copy, modify, and distribute this software and 6 * its documentation for any purpose and without fee is hereby granted, 7 * provided that the above copyright notice appears in all copies and 8 * that both that copyright notice and this permission notice appear 9 * in supporting documentation, and that the name of The University 10 * of Michigan not be used in advertising or publicity pertaining to 11 * distribution of the software without specific, written prior 12 * permission. This software is supplied as is without expressed or 13 * implied warranties of any kind. 14 * 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 18 * Research Systems Unix Group 19 * The University of Michigan 20 * c/o Wesley Craig 21 * 535 W. William Street 22 * Ann Arbor, Michigan 23 * +1-313-764-2278 24 * netatalk@umich.edu 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/sockio.h> 32 #include <sys/malloc.h> 33 #include <sys/kernel.h> 34 #include <sys/priv.h> 35 #include <sys/socket.h> 36 #include <net/if.h> 37 #include <net/route.h> 38 #include <netinet/in.h> 39 #undef s_net 40 #include <netinet/if_ether.h> 41 42 #include <netatalk/at.h> 43 #include <netatalk/at_var.h> 44 #include <netatalk/at_extern.h> 45 46 struct at_ifaddr *at_ifaddr_list; 47 48 static int aa_dorangeroute(struct ifaddr *ifa, u_int first, u_int last, 49 int cmd); 50 static int aa_addsingleroute(struct ifaddr *ifa, struct at_addr *addr, 51 struct at_addr *mask); 52 static int aa_delsingleroute(struct ifaddr *ifa, struct at_addr *addr, 53 struct at_addr *mask); 54 static int aa_dosingleroute(struct ifaddr *ifa, struct at_addr *addr, 55 struct at_addr *mask, int cmd, int flags); 56 static int at_scrub(struct ifnet *ifp, struct at_ifaddr *aa); 57 static int at_ifinit(struct ifnet *ifp, struct at_ifaddr *aa, 58 struct sockaddr_at *sat); 59 static int aa_claim_addr(struct ifaddr *ifa, struct sockaddr *gw); 60 61 #define sateqaddr(a,b) \ 62 ((a)->sat_len == (b)->sat_len && \ 63 (a)->sat_family == (b)->sat_family && \ 64 (a)->sat_addr.s_net == (b)->sat_addr.s_net && \ 65 (a)->sat_addr.s_node == (b)->sat_addr.s_node) 66 67 int 68 at_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 69 struct thread *td) 70 { 71 struct ifreq *ifr = (struct ifreq *)data; 72 struct sockaddr_at *sat; 73 struct netrange *nr; 74 struct at_aliasreq *ifra = (struct at_aliasreq *)data; 75 struct at_ifaddr *aa0; 76 struct at_ifaddr *aa = NULL; 77 struct ifaddr *ifa, *ifa0; 78 79 /* 80 * If we have an ifp, then find the matching at_ifaddr if it exists 81 */ 82 if (ifp != NULL) { 83 for (aa = at_ifaddr_list; aa != NULL; aa = aa->aa_next) { 84 if (aa->aa_ifp == ifp) 85 break; 86 } 87 } 88 89 /* 90 * In this first switch table we are basically getting ready for 91 * the second one, by getting the atalk-specific things set up 92 * so that they start to look more similar to other protocols etc. 93 */ 94 95 switch (cmd) { 96 case SIOCAIFADDR: 97 case SIOCDIFADDR: 98 /* 99 * If we have an appletalk sockaddr, scan forward of where we 100 * are now on the at_ifaddr list to find one with a matching 101 * address on this interface. This may leave aa pointing to 102 * the first address on the NEXT interface! 103 */ 104 if (ifra->ifra_addr.sat_family == AF_APPLETALK) { 105 for (; aa; aa = aa->aa_next) { 106 if (aa->aa_ifp == ifp && 107 sateqaddr(&aa->aa_addr, &ifra->ifra_addr)) 108 break; 109 } 110 } 111 /* 112 * If we a retrying to delete an addres but didn't find such, 113 * then rewurn with an error 114 */ 115 if (cmd == SIOCDIFADDR && aa == NULL) 116 return (EADDRNOTAVAIL); 117 /*FALLTHROUGH*/ 118 119 case SIOCSIFADDR: 120 /* 121 * If we are not superuser, then we don't get to do these ops. 122 * 123 * XXXRW: Layering? 124 */ 125 if (priv_check(td, PRIV_NET_ADDIFADDR)) 126 return (EPERM); 127 128 sat = satosat(&ifr->ifr_addr); 129 nr = (struct netrange *)sat->sat_zero; 130 if (nr->nr_phase == 1) { 131 /* 132 * Look for a phase 1 address on this interface. 133 * This may leave aa pointing to the first address on 134 * the NEXT interface! 135 */ 136 for (; aa; aa = aa->aa_next) { 137 if (aa->aa_ifp == ifp && 138 (aa->aa_flags & AFA_PHASE2) == 0) 139 break; 140 } 141 } else { /* default to phase 2 */ 142 /* 143 * Look for a phase 2 address on this interface. 144 * This may leave aa pointing to the first address on 145 * the NEXT interface! 146 */ 147 for (; aa; aa = aa->aa_next) { 148 if (aa->aa_ifp == ifp && (aa->aa_flags & 149 AFA_PHASE2)) 150 break; 151 } 152 } 153 154 if (ifp == NULL) 155 panic("at_control"); 156 157 /* 158 * If we failed to find an existing at_ifaddr entry, then we 159 * allocate a fresh one. 160 */ 161 if (aa == NULL) { 162 aa0 = malloc(sizeof(struct at_ifaddr), M_IFADDR, 163 M_WAITOK | M_ZERO); 164 callout_init(&aa0->aa_callout, CALLOUT_MPSAFE); 165 if ((aa = at_ifaddr_list) != NULL) { 166 /* 167 * Don't let the loopback be first, since the 168 * first address is the machine's default 169 * address for binding. If it is, stick 170 * ourself in front, otherwise go to the back 171 * of the list. 172 */ 173 if (at_ifaddr_list->aa_ifp->if_flags & 174 IFF_LOOPBACK) { 175 aa = aa0; 176 aa->aa_next = at_ifaddr_list; 177 at_ifaddr_list = aa; 178 } else { 179 for (; aa->aa_next; aa = aa->aa_next) 180 ; 181 aa->aa_next = aa0; 182 } 183 } else 184 at_ifaddr_list = aa0; 185 aa = aa0; 186 187 /* 188 * Find the end of the interface's addresses 189 * and link our new one on the end 190 */ 191 ifa = (struct ifaddr *)aa; 192 IFA_LOCK_INIT(ifa); 193 ifa->ifa_refcnt = 1; 194 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 195 196 /* 197 * As the at_ifaddr contains the actual sockaddrs, 198 * and the ifaddr itself, link them al together 199 * correctly. 200 */ 201 ifa->ifa_addr = (struct sockaddr *)&aa->aa_addr; 202 ifa->ifa_dstaddr = (struct sockaddr *)&aa->aa_addr; 203 ifa->ifa_netmask = (struct sockaddr *)&aa->aa_netmask; 204 205 /* 206 * Set/clear the phase 2 bit. 207 */ 208 if (nr->nr_phase == 1) 209 aa->aa_flags &= ~AFA_PHASE2; 210 else 211 aa->aa_flags |= AFA_PHASE2; 212 213 /* 214 * and link it all together 215 */ 216 aa->aa_ifp = ifp; 217 } else { 218 /* 219 * If we DID find one then we clobber any routes 220 * dependent on it.. 221 */ 222 at_scrub(ifp, aa); 223 } 224 break; 225 226 case SIOCGIFADDR : 227 sat = satosat(&ifr->ifr_addr); 228 nr = (struct netrange *)sat->sat_zero; 229 if (nr->nr_phase == 1) { 230 /* 231 * If the request is specifying phase 1, then 232 * only look at a phase one address 233 */ 234 for (; aa; aa = aa->aa_next) { 235 if (aa->aa_ifp == ifp && 236 (aa->aa_flags & AFA_PHASE2) == 0) 237 break; 238 } 239 } else { 240 /* 241 * default to phase 2 242 */ 243 for (; aa; aa = aa->aa_next) { 244 if (aa->aa_ifp == ifp && (aa->aa_flags & 245 AFA_PHASE2)) 246 break; 247 } 248 } 249 250 if (aa == NULL) 251 return (EADDRNOTAVAIL); 252 break; 253 } 254 255 /* 256 * By the time this switch is run we should be able to assume that 257 * the "aa" pointer is valid when needed. 258 */ 259 switch (cmd) { 260 case SIOCGIFADDR: 261 262 /* 263 * copy the contents of the sockaddr blindly. 264 */ 265 sat = (struct sockaddr_at *)&ifr->ifr_addr; 266 *sat = aa->aa_addr; 267 268 /* 269 * and do some cleanups 270 */ 271 ((struct netrange *)&sat->sat_zero)->nr_phase 272 = (aa->aa_flags & AFA_PHASE2) ? 2 : 1; 273 ((struct netrange *)&sat->sat_zero)->nr_firstnet = 274 aa->aa_firstnet; 275 ((struct netrange *)&sat->sat_zero)->nr_lastnet = 276 aa->aa_lastnet; 277 break; 278 279 case SIOCSIFADDR: 280 return (at_ifinit(ifp, aa, 281 (struct sockaddr_at *)&ifr->ifr_addr)); 282 283 case SIOCAIFADDR: 284 if (sateqaddr(&ifra->ifra_addr, &aa->aa_addr)) 285 return (0); 286 return (at_ifinit(ifp, aa, 287 (struct sockaddr_at *)&ifr->ifr_addr)); 288 289 case SIOCDIFADDR: 290 /* 291 * scrub all routes.. didn't we just DO this? XXX yes, del it 292 */ 293 at_scrub(ifp, aa); 294 295 /* 296 * remove the ifaddr from the interface 297 */ 298 ifa0 = (struct ifaddr *)aa; 299 TAILQ_REMOVE(&ifp->if_addrhead, ifa0, ifa_link); 300 301 /* 302 * Now remove the at_ifaddr from the parallel structure 303 * as well, or we'd be in deep trouble 304 */ 305 aa0 = aa; 306 if (aa0 == (aa = at_ifaddr_list)) { 307 at_ifaddr_list = aa->aa_next; 308 } else { 309 while (aa->aa_next && (aa->aa_next != aa0)) 310 aa = aa->aa_next; 311 312 /* 313 * if we found it, remove it, otherwise we screwed up. 314 */ 315 if (aa->aa_next) 316 aa->aa_next = aa0->aa_next; 317 else 318 panic("at_control"); 319 } 320 321 /* 322 * Now reclaim the reference. 323 */ 324 IFAFREE(ifa0); 325 break; 326 327 default: 328 if (ifp == NULL || ifp->if_ioctl == NULL) 329 return (EOPNOTSUPP); 330 return ((*ifp->if_ioctl)(ifp, cmd, data)); 331 } 332 return (0); 333 } 334 335 /* 336 * Given an interface and an at_ifaddr (supposedly on that interface) 337 * remove any routes that depend on this. 338 * Why ifp is needed I'm not sure, 339 * as aa->at_ifaddr.ifa_ifp should be the same. 340 */ 341 static int 342 at_scrub(struct ifnet *ifp, struct at_ifaddr *aa) 343 { 344 int error; 345 346 if (aa->aa_flags & AFA_ROUTE) { 347 if (ifp->if_flags & IFF_LOOPBACK) { 348 if ((error = aa_delsingleroute(&aa->aa_ifa, 349 &aa->aa_addr.sat_addr, &aa->aa_netmask.sat_addr)) 350 != 0) 351 return (error); 352 } else if (ifp->if_flags & IFF_POINTOPOINT) { 353 if ((error = rtinit(&aa->aa_ifa, RTM_DELETE, 354 RTF_HOST)) != 0) 355 return (error); 356 } else if (ifp->if_flags & IFF_BROADCAST) { 357 error = aa_dorangeroute(&aa->aa_ifa, 358 ntohs(aa->aa_firstnet), ntohs(aa->aa_lastnet), 359 RTM_DELETE); 360 } 361 aa->aa_ifa.ifa_flags &= ~IFA_ROUTE; 362 aa->aa_flags &= ~AFA_ROUTE; 363 } 364 return (0); 365 } 366 367 /* 368 * given an at_ifaddr,a sockaddr_at and an ifp, 369 * bang them all together at high speed and see what happens 370 */ 371 static int 372 at_ifinit(struct ifnet *ifp, struct at_ifaddr *aa, struct sockaddr_at *sat) 373 { 374 struct netrange nr, onr; 375 struct sockaddr_at oldaddr; 376 int error = 0, i, j; 377 int netinc, nodeinc, nnets; 378 u_short net; 379 380 /* 381 * save the old addresses in the at_ifaddr just in case we need them. 382 */ 383 oldaddr = aa->aa_addr; 384 onr.nr_firstnet = aa->aa_firstnet; 385 onr.nr_lastnet = aa->aa_lastnet; 386 387 /* 388 * take the address supplied as an argument, and add it to the 389 * at_ifnet (also given). Remember ing to update 390 * those parts of the at_ifaddr that need special processing 391 */ 392 bzero(AA_SAT(aa), sizeof(struct sockaddr_at)); 393 bcopy(sat->sat_zero, &nr, sizeof(struct netrange)); 394 bcopy(sat->sat_zero, AA_SAT(aa)->sat_zero, sizeof(struct netrange)); 395 nnets = ntohs(nr.nr_lastnet) - ntohs(nr.nr_firstnet) + 1; 396 aa->aa_firstnet = nr.nr_firstnet; 397 aa->aa_lastnet = nr.nr_lastnet; 398 399 /* XXX ALC */ 400 #if 0 401 printf("at_ifinit: %s: %u.%u range %u-%u phase %d\n", 402 ifp->if_name, 403 ntohs(sat->sat_addr.s_net), sat->sat_addr.s_node, 404 ntohs(aa->aa_firstnet), ntohs(aa->aa_lastnet), 405 (aa->aa_flags & AFA_PHASE2) ? 2 : 1); 406 #endif 407 408 /* 409 * We could eliminate the need for a second phase 1 probe (post 410 * autoconf) if we check whether we're resetting the node. Note 411 * that phase 1 probes use only nodes, not net.node pairs. Under 412 * phase 2, both the net and node must be the same. 413 */ 414 if (ifp->if_flags & IFF_LOOPBACK) { 415 AA_SAT(aa)->sat_len = sat->sat_len; 416 AA_SAT(aa)->sat_family = AF_APPLETALK; 417 AA_SAT(aa)->sat_addr.s_net = sat->sat_addr.s_net; 418 AA_SAT(aa)->sat_addr.s_node = sat->sat_addr.s_node; 419 #if 0 420 } else if (fp->if_flags & IFF_POINTOPOINT) { 421 /* unimplemented */ 422 /* 423 * we'd have to copy the dstaddr field over from the sat 424 * but it's not clear that it would contain the right info.. 425 */ 426 #endif 427 } else { 428 /* 429 * We are a normal (probably ethernet) interface. 430 * apply the new address to the interface structures etc. 431 * We will probe this address on the net first, before 432 * applying it to ensure that it is free.. If it is not, then 433 * we will try a number of other randomly generated addresses 434 * in this net and then increment the net. etc.etc. until 435 * we find an unused address. 436 */ 437 aa->aa_flags |= AFA_PROBING; /* not loopback we Must probe? */ 438 AA_SAT(aa)->sat_len = sizeof(struct sockaddr_at); 439 AA_SAT(aa)->sat_family = AF_APPLETALK; 440 if (aa->aa_flags & AFA_PHASE2) { 441 if (sat->sat_addr.s_net == ATADDR_ANYNET) { 442 /* 443 * If we are phase 2, and the net was not 444 * specified then we select a random net 445 * within the supplied netrange. 446 * XXX use /dev/random? 447 */ 448 if (nnets != 1) 449 net = ntohs(nr.nr_firstnet) + 450 time_second % (nnets - 1); 451 else 452 net = ntohs(nr.nr_firstnet); 453 } else { 454 /* 455 * if a net was supplied, then check that it 456 * is within the netrange. If it is not then 457 * replace the old values and return an error 458 */ 459 if (ntohs(sat->sat_addr.s_net) < 460 ntohs(nr.nr_firstnet) || 461 ntohs(sat->sat_addr.s_net) > 462 ntohs(nr.nr_lastnet)) { 463 aa->aa_addr = oldaddr; 464 aa->aa_firstnet = onr.nr_firstnet; 465 aa->aa_lastnet = onr.nr_lastnet; 466 return (EINVAL); 467 } 468 /* 469 * otherwise just use the new net number.. 470 */ 471 net = ntohs(sat->sat_addr.s_net); 472 } 473 } else { 474 /* 475 * we must be phase one, so just use whatever we were 476 * given. I guess it really isn't going to be 477 * used... RIGHT? 478 */ 479 net = ntohs(sat->sat_addr.s_net); 480 } 481 482 /* 483 * set the node part of the address into the ifaddr. 484 * If it's not specified, be random about it... 485 * XXX use /dev/random? 486 */ 487 if (sat->sat_addr.s_node == ATADDR_ANYNODE) 488 AA_SAT(aa)->sat_addr.s_node = time_second; 489 else 490 AA_SAT(aa)->sat_addr.s_node = sat->sat_addr.s_node; 491 492 /* 493 * Copy the phase. 494 */ 495 AA_SAT(aa)->sat_range.r_netrange.nr_phase = 496 ((aa->aa_flags & AFA_PHASE2) ? 2:1); 497 498 /* 499 * step through the nets in the range 500 * starting at the (possibly random) start point. 501 */ 502 for (i = nnets, netinc = 1; i > 0; net = 503 ntohs(nr.nr_firstnet) + ((net - ntohs(nr.nr_firstnet) + 504 netinc) % nnets), i--) { 505 AA_SAT(aa)->sat_addr.s_net = htons(net); 506 507 /* 508 * using a rather strange stepping method, 509 * stagger through the possible node addresses 510 * Once again, starting at the (possibly random) 511 * initial node address. 512 */ 513 for (j = 0, nodeinc = time_second | 1; j < 256; 514 j++, AA_SAT(aa)->sat_addr.s_node += nodeinc) { 515 if (AA_SAT(aa)->sat_addr.s_node > 253 || 516 AA_SAT(aa)->sat_addr.s_node < 1) 517 continue; 518 aa->aa_probcnt = 10; 519 520 /* 521 * start off the probes as an asynchronous 522 * activity. though why wait 200mSec? 523 */ 524 AARPTAB_LOCK(); 525 callout_reset(&aa->aa_callout, hz / 5, 526 aarpprobe, ifp); 527 if (msleep(aa, &aarptab_mtx, PPAUSE|PCATCH, 528 "at_ifinit", 0)) { 529 AARPTAB_UNLOCK(); 530 /* 531 * theoretically we shouldn't time 532 * out here so if we returned with an 533 * error.. 534 */ 535 printf("at_ifinit: why did this " 536 "happen?!\n"); 537 aa->aa_addr = oldaddr; 538 aa->aa_firstnet = onr.nr_firstnet; 539 aa->aa_lastnet = onr.nr_lastnet; 540 return (EINTR); 541 } 542 AARPTAB_UNLOCK(); 543 544 /* 545 * The async activity should have woken us 546 * up. We need to see if it was successful 547 * in finding a free spot, or if we need to 548 * iterate to the next address to try. 549 */ 550 if ((aa->aa_flags & AFA_PROBING) == 0) 551 break; 552 } 553 554 /* 555 * of course we need to break out through two loops... 556 */ 557 if ((aa->aa_flags & AFA_PROBING) == 0) 558 break; 559 /* reset node for next network */ 560 AA_SAT(aa)->sat_addr.s_node = time_second; 561 } 562 563 /* 564 * if we are still trying to probe, then we have finished all 565 * the possible addresses, so we need to give up 566 */ 567 if (aa->aa_flags & AFA_PROBING) { 568 aa->aa_addr = oldaddr; 569 aa->aa_firstnet = onr.nr_firstnet; 570 aa->aa_lastnet = onr.nr_lastnet; 571 return (EADDRINUSE); 572 } 573 } 574 575 /* 576 * Now that we have selected an address, we need to tell the interface 577 * about it, just in case it needs to adjust something. 578 */ 579 if (ifp->if_ioctl != NULL && 580 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)aa))) { 581 /* 582 * of course this could mean that it objects violently 583 * so if it does, we back out again.. 584 */ 585 aa->aa_addr = oldaddr; 586 aa->aa_firstnet = onr.nr_firstnet; 587 aa->aa_lastnet = onr.nr_lastnet; 588 return (error); 589 } 590 591 /* 592 * set up the netmask part of the at_ifaddr 593 * and point the appropriate pointer in the ifaddr to it. 594 * probably pointless, but what the heck.. XXX 595 */ 596 bzero(&aa->aa_netmask, sizeof(aa->aa_netmask)); 597 aa->aa_netmask.sat_len = sizeof(struct sockaddr_at); 598 aa->aa_netmask.sat_family = AF_APPLETALK; 599 aa->aa_netmask.sat_addr.s_net = 0xffff; 600 aa->aa_netmask.sat_addr.s_node = 0; 601 aa->aa_ifa.ifa_netmask =(struct sockaddr *) &(aa->aa_netmask); /* XXX */ 602 603 /* 604 * Initialize broadcast (or remote p2p) address 605 */ 606 bzero(&aa->aa_broadaddr, sizeof(aa->aa_broadaddr)); 607 aa->aa_broadaddr.sat_len = sizeof(struct sockaddr_at); 608 aa->aa_broadaddr.sat_family = AF_APPLETALK; 609 610 aa->aa_ifa.ifa_metric = ifp->if_metric; 611 if (ifp->if_flags & IFF_BROADCAST) { 612 aa->aa_broadaddr.sat_addr.s_net = htons(0); 613 aa->aa_broadaddr.sat_addr.s_node = 0xff; 614 aa->aa_ifa.ifa_broadaddr = (struct sockaddr *) 615 &aa->aa_broadaddr; 616 /* add the range of routes needed */ 617 error = aa_dorangeroute(&aa->aa_ifa, ntohs(aa->aa_firstnet), 618 ntohs(aa->aa_lastnet), RTM_ADD); 619 } else if (ifp->if_flags & IFF_POINTOPOINT) { 620 struct at_addr rtaddr, rtmask; 621 622 bzero(&rtaddr, sizeof(rtaddr)); 623 bzero(&rtmask, sizeof(rtmask)); 624 /* fill in the far end if we know it here XXX */ 625 aa->aa_ifa.ifa_dstaddr = (struct sockaddr *) &aa->aa_dstaddr; 626 error = aa_addsingleroute(&aa->aa_ifa, &rtaddr, &rtmask); 627 } else if (ifp->if_flags & IFF_LOOPBACK) { 628 struct at_addr rtaddr, rtmask; 629 630 bzero(&rtaddr, sizeof(rtaddr)); 631 bzero(&rtmask, sizeof(rtmask)); 632 rtaddr.s_net = AA_SAT(aa)->sat_addr.s_net; 633 rtaddr.s_node = AA_SAT(aa)->sat_addr.s_node; 634 rtmask.s_net = 0xffff; 635 /* XXX should not be so.. should be HOST route */ 636 rtmask.s_node = 0x0; 637 error = aa_addsingleroute(&aa->aa_ifa, &rtaddr, &rtmask); 638 } 639 640 /* 641 * set the address of our "check if this addr is ours" routine. 642 */ 643 aa->aa_ifa.ifa_claim_addr = aa_claim_addr; 644 645 /* 646 * of course if we can't add these routes we back out, but it's 647 * getting risky by now XXX 648 */ 649 if (error) { 650 at_scrub(ifp, aa); 651 aa->aa_addr = oldaddr; 652 aa->aa_firstnet = onr.nr_firstnet; 653 aa->aa_lastnet = onr.nr_lastnet; 654 return (error); 655 } 656 657 /* 658 * note that the address has a route associated with it.... 659 */ 660 aa->aa_ifa.ifa_flags |= IFA_ROUTE; 661 aa->aa_flags |= AFA_ROUTE; 662 return (0); 663 } 664 665 /* 666 * check whether a given address is a broadcast address for us.. 667 */ 668 int 669 at_broadcast(struct sockaddr_at *sat) 670 { 671 struct at_ifaddr *aa; 672 673 /* 674 * If the node is not right, it can't be a broadcast 675 */ 676 if (sat->sat_addr.s_node != ATADDR_BCAST) 677 return (0); 678 679 /* 680 * If the node was right then if the net is right, it's a broadcast 681 */ 682 if (sat->sat_addr.s_net == ATADDR_ANYNET) 683 return (1); 684 685 /* 686 * failing that, if the net is one we have, it's a broadcast as well. 687 */ 688 for (aa = at_ifaddr_list; aa != NULL; aa = aa->aa_next) { 689 if ((aa->aa_ifp->if_flags & IFF_BROADCAST) 690 && (ntohs(sat->sat_addr.s_net) >= ntohs(aa->aa_firstnet) 691 && ntohs(sat->sat_addr.s_net) <= ntohs(aa->aa_lastnet))) 692 return (1); 693 } 694 return (0); 695 } 696 697 /* 698 * aa_dorangeroute() 699 * 700 * Add a route for a range of networks from bot to top - 1. 701 * Algorithm: 702 * 703 * Split the range into two subranges such that the middle 704 * of the two ranges is the point where the highest bit of difference 705 * between the two addresses makes its transition. 706 * Each of the upper and lower ranges might not exist, or might be 707 * representable by 1 or more netmasks. In addition, if both 708 * ranges can be represented by the same netmask, then they can be merged 709 * by using the next higher netmask.. 710 */ 711 712 static int 713 aa_dorangeroute(struct ifaddr *ifa, u_int bot, u_int top, int cmd) 714 { 715 u_int mask1; 716 struct at_addr addr; 717 struct at_addr mask; 718 int error; 719 720 /* 721 * slight sanity check 722 */ 723 if (bot > top) return (EINVAL); 724 725 addr.s_node = 0; 726 mask.s_node = 0; 727 /* 728 * just start out with the lowest boundary 729 * and keep extending the mask till it's too big. 730 */ 731 732 while (bot <= top) { 733 mask1 = 1; 734 while (((bot & ~mask1) >= bot) && ((bot | mask1) <= top)) { 735 mask1 <<= 1; 736 mask1 |= 1; 737 } 738 mask1 >>= 1; 739 mask.s_net = htons(~mask1); 740 addr.s_net = htons(bot); 741 if (cmd == RTM_ADD) { 742 error = aa_addsingleroute(ifa,&addr,&mask); 743 if (error) { 744 /* XXX clean up? */ 745 return (error); 746 } 747 } else 748 error = aa_delsingleroute(ifa,&addr,&mask); 749 bot = (bot | mask1) + 1; 750 } 751 return (0); 752 } 753 754 static int 755 aa_addsingleroute(struct ifaddr *ifa, struct at_addr *addr, 756 struct at_addr *mask) 757 { 758 int error; 759 760 #if 0 761 printf("aa_addsingleroute: %x.%x mask %x.%x ...\n", 762 ntohs(addr->s_net), addr->s_node, ntohs(mask->s_net), 763 mask->s_node); 764 #endif 765 766 error = aa_dosingleroute(ifa, addr, mask, RTM_ADD, RTF_UP); 767 if (error) 768 printf("aa_addsingleroute: error %d\n", error); 769 return (error); 770 } 771 772 static int 773 aa_delsingleroute(struct ifaddr *ifa, struct at_addr *addr, 774 struct at_addr *mask) 775 { 776 int error; 777 778 error = aa_dosingleroute(ifa, addr, mask, RTM_DELETE, 0); 779 if (error) 780 printf("aa_delsingleroute: error %d\n", error); 781 return (error); 782 } 783 784 static int 785 aa_dosingleroute(struct ifaddr *ifa, struct at_addr *at_addr, 786 struct at_addr *at_mask, int cmd, int flags) 787 { 788 struct sockaddr_at addr, mask; 789 790 bzero(&addr, sizeof(addr)); 791 bzero(&mask, sizeof(mask)); 792 addr.sat_family = AF_APPLETALK; 793 addr.sat_len = sizeof(struct sockaddr_at); 794 addr.sat_addr.s_net = at_addr->s_net; 795 addr.sat_addr.s_node = at_addr->s_node; 796 mask.sat_family = AF_APPLETALK; 797 mask.sat_len = sizeof(struct sockaddr_at); 798 mask.sat_addr.s_net = at_mask->s_net; 799 mask.sat_addr.s_node = at_mask->s_node; 800 if (at_mask->s_node) 801 flags |= RTF_HOST; 802 return (rtrequest(cmd, (struct sockaddr *) &addr, 803 (flags & RTF_HOST)?(ifa->ifa_dstaddr):(ifa->ifa_addr), 804 (struct sockaddr *) &mask, flags, NULL)); 805 } 806 807 #if 0 808 809 static void 810 aa_clean(void) 811 { 812 struct at_ifaddr *aa; 813 struct ifaddr *ifa; 814 struct ifnet *ifp; 815 816 while ((aa = at_ifaddr_list) != NULL) { 817 ifp = aa->aa_ifp; 818 at_scrub(ifp, aa); 819 at_ifaddr_list = aa->aa_next; 820 if ((ifa = ifp->if_addrlist) == (struct ifaddr *)aa) 821 ifp->if_addrlist = ifa->ifa_next; 822 else { 823 while (ifa->ifa_next && 824 (ifa->ifa_next != (struct ifaddr *)aa)) 825 ifa = ifa->ifa_next; 826 if (ifa->ifa_next) 827 ifa->ifa_next = 828 ((struct ifaddr *)aa)->ifa_next; 829 else 830 panic("at_entry"); 831 } 832 } 833 } 834 835 #endif 836 837 static int 838 aa_claim_addr(struct ifaddr *ifa, struct sockaddr *gw0) 839 { 840 struct sockaddr_at *addr = (struct sockaddr_at *)ifa->ifa_addr; 841 struct sockaddr_at *gw = (struct sockaddr_at *)gw0; 842 843 switch (gw->sat_range.r_netrange.nr_phase) { 844 case 1: 845 if(addr->sat_range.r_netrange.nr_phase == 1) 846 return (1); 847 848 case 0: 849 case 2: 850 /* 851 * if it's our net (including 0), 852 * or netranges are valid, and we are in the range, 853 * then it's ours. 854 */ 855 if ((addr->sat_addr.s_net == gw->sat_addr.s_net) 856 || ((addr->sat_range.r_netrange.nr_lastnet) 857 && (ntohs(gw->sat_addr.s_net) >= 858 ntohs(addr->sat_range.r_netrange.nr_firstnet)) 859 && (ntohs(gw->sat_addr.s_net) <= 860 ntohs(addr->sat_range.r_netrange.nr_lastnet)))) 861 return (1); 862 break; 863 default: 864 printf("atalk: bad phase\n"); 865 } 866 return (0); 867 }
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