1 /* 2 * DDP: An implementation of the AppleTalk DDP protocol for 3 * Ethernet 'ELAP'. 4 * 5 * Alan Cox <alan@lxorguk.ukuu.org.uk> 6 * 7 * With more than a little assistance from 8 * 9 * Wesley Craig <netatalk@umich.edu> 10 * 11 * Fixes: 12 * Neil Horman : Added missing device ioctls 13 * Michael Callahan : Made routing work 14 * Wesley Craig : Fix probing to listen to a 15 * passed node id. 16 * Alan Cox : Added send/recvmsg support 17 * Alan Cox : Moved at. to protinfo in 18 * socket. 19 * Alan Cox : Added firewall hooks. 20 * Alan Cox : Supports new ARPHRD_LOOPBACK 21 * Christer Weinigel : Routing and /proc fixes. 22 * Bradford Johnson : LocalTalk. 23 * Tom Dyas : Module support. 24 * Alan Cox : Hooks for PPP (based on the 25 * LocalTalk hook). 26 * Alan Cox : Posix bits 27 * Alan Cox/Mike Freeman : Possible fix to NBP problems 28 * Bradford Johnson : IP-over-DDP (experimental) 29 * Jay Schulist : Moved IP-over-DDP to its own 30 * driver file. (ipddp.c & ipddp.h) 31 * Jay Schulist : Made work as module with 32 * AppleTalk drivers, cleaned it. 33 * Rob Newberry : Added proxy AARP and AARP 34 * procfs, moved probing to AARP 35 * module. 36 * Adrian Sun/ 37 * Michael Zuelsdorff : fix for net.0 packets. don't 38 * allow illegal ether/tokentalk 39 * port assignment. we lose a 40 * valid localtalk port as a 41 * result. 42 * Arnaldo C. de Melo : Cleanup, in preparation for 43 * shared skb support 8) 44 * Arnaldo C. de Melo : Move proc stuff to atalk_proc.c, 45 * use seq_file 46 * 47 * This program is free software; you can redistribute it and/or 48 * modify it under the terms of the GNU General Public License 49 * as published by the Free Software Foundation; either version 50 * 2 of the License, or (at your option) any later version. 51 * 52 */ 53 54 #include <linux/capability.h> 55 #include <linux/module.h> 56 #include <linux/if_arp.h> 57 #include <linux/termios.h> /* For TIOCOUTQ/INQ */ 58 #include <linux/compat.h> 59 #include <linux/slab.h> 60 #include <net/datalink.h> 61 #include <net/psnap.h> 62 #include <net/sock.h> 63 #include <net/tcp_states.h> 64 #include <net/route.h> 65 #include <linux/atalk.h> 66 #include <linux/highmem.h> 67 68 struct datalink_proto *ddp_dl, *aarp_dl; 69 static const struct proto_ops atalk_dgram_ops; 70 71 /**************************************************************************\ 72 * * 73 * Handlers for the socket list. * 74 * * 75 \**************************************************************************/ 76 77 HLIST_HEAD(atalk_sockets); 78 DEFINE_RWLOCK(atalk_sockets_lock); 79 80 static inline void __atalk_insert_socket(struct sock *sk) 81 { 82 sk_add_node(sk, &atalk_sockets); 83 } 84 85 static inline void atalk_remove_socket(struct sock *sk) 86 { 87 write_lock_bh(&atalk_sockets_lock); 88 sk_del_node_init(sk); 89 write_unlock_bh(&atalk_sockets_lock); 90 } 91 92 static struct sock *atalk_search_socket(struct sockaddr_at *to, 93 struct atalk_iface *atif) 94 { 95 struct sock *s; 96 97 read_lock_bh(&atalk_sockets_lock); 98 sk_for_each(s, &atalk_sockets) { 99 struct atalk_sock *at = at_sk(s); 100 101 if (to->sat_port != at->src_port) 102 continue; 103 104 if (to->sat_addr.s_net == ATADDR_ANYNET && 105 to->sat_addr.s_node == ATADDR_BCAST) 106 goto found; 107 108 if (to->sat_addr.s_net == at->src_net && 109 (to->sat_addr.s_node == at->src_node || 110 to->sat_addr.s_node == ATADDR_BCAST || 111 to->sat_addr.s_node == ATADDR_ANYNODE)) 112 goto found; 113 114 /* XXXX.0 -- we got a request for this router. make sure 115 * that the node is appropriately set. */ 116 if (to->sat_addr.s_node == ATADDR_ANYNODE && 117 to->sat_addr.s_net != ATADDR_ANYNET && 118 atif->address.s_node == at->src_node) { 119 to->sat_addr.s_node = atif->address.s_node; 120 goto found; 121 } 122 } 123 s = NULL; 124 found: 125 read_unlock_bh(&atalk_sockets_lock); 126 return s; 127 } 128 129 /** 130 * atalk_find_or_insert_socket - Try to find a socket matching ADDR 131 * @sk: socket to insert in the list if it is not there already 132 * @sat: address to search for 133 * 134 * Try to find a socket matching ADDR in the socket list, if found then return 135 * it. If not, insert SK into the socket list. 136 * 137 * This entire operation must execute atomically. 138 */ 139 static struct sock *atalk_find_or_insert_socket(struct sock *sk, 140 struct sockaddr_at *sat) 141 { 142 struct sock *s; 143 struct atalk_sock *at; 144 145 write_lock_bh(&atalk_sockets_lock); 146 sk_for_each(s, &atalk_sockets) { 147 at = at_sk(s); 148 149 if (at->src_net == sat->sat_addr.s_net && 150 at->src_node == sat->sat_addr.s_node && 151 at->src_port == sat->sat_port) 152 goto found; 153 } 154 s = NULL; 155 __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */ 156 found: 157 write_unlock_bh(&atalk_sockets_lock); 158 return s; 159 } 160 161 static void atalk_destroy_timer(unsigned long data) 162 { 163 struct sock *sk = (struct sock *)data; 164 165 if (sk_has_allocations(sk)) { 166 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; 167 add_timer(&sk->sk_timer); 168 } else 169 sock_put(sk); 170 } 171 172 static inline void atalk_destroy_socket(struct sock *sk) 173 { 174 atalk_remove_socket(sk); 175 skb_queue_purge(&sk->sk_receive_queue); 176 177 if (sk_has_allocations(sk)) { 178 setup_timer(&sk->sk_timer, atalk_destroy_timer, 179 (unsigned long)sk); 180 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; 181 add_timer(&sk->sk_timer); 182 } else 183 sock_put(sk); 184 } 185 186 /**************************************************************************\ 187 * * 188 * Routing tables for the AppleTalk socket layer. * 189 * * 190 \**************************************************************************/ 191 192 /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */ 193 struct atalk_route *atalk_routes; 194 DEFINE_RWLOCK(atalk_routes_lock); 195 196 struct atalk_iface *atalk_interfaces; 197 DEFINE_RWLOCK(atalk_interfaces_lock); 198 199 /* For probing devices or in a routerless network */ 200 struct atalk_route atrtr_default; 201 202 /* AppleTalk interface control */ 203 /* 204 * Drop a device. Doesn't drop any of its routes - that is the caller's 205 * problem. Called when we down the interface or delete the address. 206 */ 207 static void atif_drop_device(struct net_device *dev) 208 { 209 struct atalk_iface **iface = &atalk_interfaces; 210 struct atalk_iface *tmp; 211 212 write_lock_bh(&atalk_interfaces_lock); 213 while ((tmp = *iface) != NULL) { 214 if (tmp->dev == dev) { 215 *iface = tmp->next; 216 dev_put(dev); 217 kfree(tmp); 218 dev->atalk_ptr = NULL; 219 } else 220 iface = &tmp->next; 221 } 222 write_unlock_bh(&atalk_interfaces_lock); 223 } 224 225 static struct atalk_iface *atif_add_device(struct net_device *dev, 226 struct atalk_addr *sa) 227 { 228 struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL); 229 230 if (!iface) 231 goto out; 232 233 dev_hold(dev); 234 iface->dev = dev; 235 dev->atalk_ptr = iface; 236 iface->address = *sa; 237 iface->status = 0; 238 239 write_lock_bh(&atalk_interfaces_lock); 240 iface->next = atalk_interfaces; 241 atalk_interfaces = iface; 242 write_unlock_bh(&atalk_interfaces_lock); 243 out: 244 return iface; 245 } 246 247 /* Perform phase 2 AARP probing on our tentative address */ 248 static int atif_probe_device(struct atalk_iface *atif) 249 { 250 int netrange = ntohs(atif->nets.nr_lastnet) - 251 ntohs(atif->nets.nr_firstnet) + 1; 252 int probe_net = ntohs(atif->address.s_net); 253 int probe_node = atif->address.s_node; 254 int netct, nodect; 255 256 /* Offset the network we start probing with */ 257 if (probe_net == ATADDR_ANYNET) { 258 probe_net = ntohs(atif->nets.nr_firstnet); 259 if (netrange) 260 probe_net += jiffies % netrange; 261 } 262 if (probe_node == ATADDR_ANYNODE) 263 probe_node = jiffies & 0xFF; 264 265 /* Scan the networks */ 266 atif->status |= ATIF_PROBE; 267 for (netct = 0; netct <= netrange; netct++) { 268 /* Sweep the available nodes from a given start */ 269 atif->address.s_net = htons(probe_net); 270 for (nodect = 0; nodect < 256; nodect++) { 271 atif->address.s_node = (nodect + probe_node) & 0xFF; 272 if (atif->address.s_node > 0 && 273 atif->address.s_node < 254) { 274 /* Probe a proposed address */ 275 aarp_probe_network(atif); 276 277 if (!(atif->status & ATIF_PROBE_FAIL)) { 278 atif->status &= ~ATIF_PROBE; 279 return 0; 280 } 281 } 282 atif->status &= ~ATIF_PROBE_FAIL; 283 } 284 probe_net++; 285 if (probe_net > ntohs(atif->nets.nr_lastnet)) 286 probe_net = ntohs(atif->nets.nr_firstnet); 287 } 288 atif->status &= ~ATIF_PROBE; 289 290 return -EADDRINUSE; /* Network is full... */ 291 } 292 293 294 /* Perform AARP probing for a proxy address */ 295 static int atif_proxy_probe_device(struct atalk_iface *atif, 296 struct atalk_addr *proxy_addr) 297 { 298 int netrange = ntohs(atif->nets.nr_lastnet) - 299 ntohs(atif->nets.nr_firstnet) + 1; 300 /* we probe the interface's network */ 301 int probe_net = ntohs(atif->address.s_net); 302 int probe_node = ATADDR_ANYNODE; /* we'll take anything */ 303 int netct, nodect; 304 305 /* Offset the network we start probing with */ 306 if (probe_net == ATADDR_ANYNET) { 307 probe_net = ntohs(atif->nets.nr_firstnet); 308 if (netrange) 309 probe_net += jiffies % netrange; 310 } 311 312 if (probe_node == ATADDR_ANYNODE) 313 probe_node = jiffies & 0xFF; 314 315 /* Scan the networks */ 316 for (netct = 0; netct <= netrange; netct++) { 317 /* Sweep the available nodes from a given start */ 318 proxy_addr->s_net = htons(probe_net); 319 for (nodect = 0; nodect < 256; nodect++) { 320 proxy_addr->s_node = (nodect + probe_node) & 0xFF; 321 if (proxy_addr->s_node > 0 && 322 proxy_addr->s_node < 254) { 323 /* Tell AARP to probe a proposed address */ 324 int ret = aarp_proxy_probe_network(atif, 325 proxy_addr); 326 327 if (ret != -EADDRINUSE) 328 return ret; 329 } 330 } 331 probe_net++; 332 if (probe_net > ntohs(atif->nets.nr_lastnet)) 333 probe_net = ntohs(atif->nets.nr_firstnet); 334 } 335 336 return -EADDRINUSE; /* Network is full... */ 337 } 338 339 340 struct atalk_addr *atalk_find_dev_addr(struct net_device *dev) 341 { 342 struct atalk_iface *iface = dev->atalk_ptr; 343 return iface ? &iface->address : NULL; 344 } 345 346 static struct atalk_addr *atalk_find_primary(void) 347 { 348 struct atalk_iface *fiface = NULL; 349 struct atalk_addr *retval; 350 struct atalk_iface *iface; 351 352 /* 353 * Return a point-to-point interface only if 354 * there is no non-ptp interface available. 355 */ 356 read_lock_bh(&atalk_interfaces_lock); 357 for (iface = atalk_interfaces; iface; iface = iface->next) { 358 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK)) 359 fiface = iface; 360 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { 361 retval = &iface->address; 362 goto out; 363 } 364 } 365 366 if (fiface) 367 retval = &fiface->address; 368 else if (atalk_interfaces) 369 retval = &atalk_interfaces->address; 370 else 371 retval = NULL; 372 out: 373 read_unlock_bh(&atalk_interfaces_lock); 374 return retval; 375 } 376 377 /* 378 * Find a match for 'any network' - ie any of our interfaces with that 379 * node number will do just nicely. 380 */ 381 static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev) 382 { 383 struct atalk_iface *iface = dev->atalk_ptr; 384 385 if (!iface || iface->status & ATIF_PROBE) 386 goto out_err; 387 388 if (node != ATADDR_BCAST && 389 iface->address.s_node != node && 390 node != ATADDR_ANYNODE) 391 goto out_err; 392 out: 393 return iface; 394 out_err: 395 iface = NULL; 396 goto out; 397 } 398 399 /* Find a match for a specific network:node pair */ 400 static struct atalk_iface *atalk_find_interface(__be16 net, int node) 401 { 402 struct atalk_iface *iface; 403 404 read_lock_bh(&atalk_interfaces_lock); 405 for (iface = atalk_interfaces; iface; iface = iface->next) { 406 if ((node == ATADDR_BCAST || 407 node == ATADDR_ANYNODE || 408 iface->address.s_node == node) && 409 iface->address.s_net == net && 410 !(iface->status & ATIF_PROBE)) 411 break; 412 413 /* XXXX.0 -- net.0 returns the iface associated with net */ 414 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET && 415 ntohs(iface->nets.nr_firstnet) <= ntohs(net) && 416 ntohs(net) <= ntohs(iface->nets.nr_lastnet)) 417 break; 418 } 419 read_unlock_bh(&atalk_interfaces_lock); 420 return iface; 421 } 422 423 424 /* 425 * Find a route for an AppleTalk packet. This ought to get cached in 426 * the socket (later on...). We know about host routes and the fact 427 * that a route must be direct to broadcast. 428 */ 429 static struct atalk_route *atrtr_find(struct atalk_addr *target) 430 { 431 /* 432 * we must search through all routes unless we find a 433 * host route, because some host routes might overlap 434 * network routes 435 */ 436 struct atalk_route *net_route = NULL; 437 struct atalk_route *r; 438 439 read_lock_bh(&atalk_routes_lock); 440 for (r = atalk_routes; r; r = r->next) { 441 if (!(r->flags & RTF_UP)) 442 continue; 443 444 if (r->target.s_net == target->s_net) { 445 if (r->flags & RTF_HOST) { 446 /* 447 * if this host route is for the target, 448 * the we're done 449 */ 450 if (r->target.s_node == target->s_node) 451 goto out; 452 } else 453 /* 454 * this route will work if there isn't a 455 * direct host route, so cache it 456 */ 457 net_route = r; 458 } 459 } 460 461 /* 462 * if we found a network route but not a direct host 463 * route, then return it 464 */ 465 if (net_route) 466 r = net_route; 467 else if (atrtr_default.dev) 468 r = &atrtr_default; 469 else /* No route can be found */ 470 r = NULL; 471 out: 472 read_unlock_bh(&atalk_routes_lock); 473 return r; 474 } 475 476 477 /* 478 * Given an AppleTalk network, find the device to use. This can be 479 * a simple lookup. 480 */ 481 struct net_device *atrtr_get_dev(struct atalk_addr *sa) 482 { 483 struct atalk_route *atr = atrtr_find(sa); 484 return atr ? atr->dev : NULL; 485 } 486 487 /* Set up a default router */ 488 static void atrtr_set_default(struct net_device *dev) 489 { 490 atrtr_default.dev = dev; 491 atrtr_default.flags = RTF_UP; 492 atrtr_default.gateway.s_net = htons(0); 493 atrtr_default.gateway.s_node = 0; 494 } 495 496 /* 497 * Add a router. Basically make sure it looks valid and stuff the 498 * entry in the list. While it uses netranges we always set them to one 499 * entry to work like netatalk. 500 */ 501 static int atrtr_create(struct rtentry *r, struct net_device *devhint) 502 { 503 struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst; 504 struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway; 505 struct atalk_route *rt; 506 struct atalk_iface *iface, *riface; 507 int retval = -EINVAL; 508 509 /* 510 * Fixme: Raise/Lower a routing change semaphore for these 511 * operations. 512 */ 513 514 /* Validate the request */ 515 if (ta->sat_family != AF_APPLETALK || 516 (!devhint && ga->sat_family != AF_APPLETALK)) 517 goto out; 518 519 /* Now walk the routing table and make our decisions */ 520 write_lock_bh(&atalk_routes_lock); 521 for (rt = atalk_routes; rt; rt = rt->next) { 522 if (r->rt_flags != rt->flags) 523 continue; 524 525 if (ta->sat_addr.s_net == rt->target.s_net) { 526 if (!(rt->flags & RTF_HOST)) 527 break; 528 if (ta->sat_addr.s_node == rt->target.s_node) 529 break; 530 } 531 } 532 533 if (!devhint) { 534 riface = NULL; 535 536 read_lock_bh(&atalk_interfaces_lock); 537 for (iface = atalk_interfaces; iface; iface = iface->next) { 538 if (!riface && 539 ntohs(ga->sat_addr.s_net) >= 540 ntohs(iface->nets.nr_firstnet) && 541 ntohs(ga->sat_addr.s_net) <= 542 ntohs(iface->nets.nr_lastnet)) 543 riface = iface; 544 545 if (ga->sat_addr.s_net == iface->address.s_net && 546 ga->sat_addr.s_node == iface->address.s_node) 547 riface = iface; 548 } 549 read_unlock_bh(&atalk_interfaces_lock); 550 551 retval = -ENETUNREACH; 552 if (!riface) 553 goto out_unlock; 554 555 devhint = riface->dev; 556 } 557 558 if (!rt) { 559 rt = kzalloc(sizeof(*rt), GFP_ATOMIC); 560 561 retval = -ENOBUFS; 562 if (!rt) 563 goto out_unlock; 564 565 rt->next = atalk_routes; 566 atalk_routes = rt; 567 } 568 569 /* Fill in the routing entry */ 570 rt->target = ta->sat_addr; 571 dev_hold(devhint); 572 rt->dev = devhint; 573 rt->flags = r->rt_flags; 574 rt->gateway = ga->sat_addr; 575 576 retval = 0; 577 out_unlock: 578 write_unlock_bh(&atalk_routes_lock); 579 out: 580 return retval; 581 } 582 583 /* Delete a route. Find it and discard it */ 584 static int atrtr_delete(struct atalk_addr *addr) 585 { 586 struct atalk_route **r = &atalk_routes; 587 int retval = 0; 588 struct atalk_route *tmp; 589 590 write_lock_bh(&atalk_routes_lock); 591 while ((tmp = *r) != NULL) { 592 if (tmp->target.s_net == addr->s_net && 593 (!(tmp->flags&RTF_GATEWAY) || 594 tmp->target.s_node == addr->s_node)) { 595 *r = tmp->next; 596 dev_put(tmp->dev); 597 kfree(tmp); 598 goto out; 599 } 600 r = &tmp->next; 601 } 602 retval = -ENOENT; 603 out: 604 write_unlock_bh(&atalk_routes_lock); 605 return retval; 606 } 607 608 /* 609 * Called when a device is downed. Just throw away any routes 610 * via it. 611 */ 612 static void atrtr_device_down(struct net_device *dev) 613 { 614 struct atalk_route **r = &atalk_routes; 615 struct atalk_route *tmp; 616 617 write_lock_bh(&atalk_routes_lock); 618 while ((tmp = *r) != NULL) { 619 if (tmp->dev == dev) { 620 *r = tmp->next; 621 dev_put(dev); 622 kfree(tmp); 623 } else 624 r = &tmp->next; 625 } 626 write_unlock_bh(&atalk_routes_lock); 627 628 if (atrtr_default.dev == dev) 629 atrtr_set_default(NULL); 630 } 631 632 /* Actually down the interface */ 633 static inline void atalk_dev_down(struct net_device *dev) 634 { 635 atrtr_device_down(dev); /* Remove all routes for the device */ 636 aarp_device_down(dev); /* Remove AARP entries for the device */ 637 atif_drop_device(dev); /* Remove the device */ 638 } 639 640 /* 641 * A device event has occurred. Watch for devices going down and 642 * delete our use of them (iface and route). 643 */ 644 static int ddp_device_event(struct notifier_block *this, unsigned long event, 645 void *ptr) 646 { 647 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 648 649 if (!net_eq(dev_net(dev), &init_net)) 650 return NOTIFY_DONE; 651 652 if (event == NETDEV_DOWN) 653 /* Discard any use of this */ 654 atalk_dev_down(dev); 655 656 return NOTIFY_DONE; 657 } 658 659 /* ioctl calls. Shouldn't even need touching */ 660 /* Device configuration ioctl calls */ 661 static int atif_ioctl(int cmd, void __user *arg) 662 { 663 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF }; 664 struct ifreq atreq; 665 struct atalk_netrange *nr; 666 struct sockaddr_at *sa; 667 struct net_device *dev; 668 struct atalk_iface *atif; 669 int ct; 670 int limit; 671 struct rtentry rtdef; 672 int add_route; 673 674 if (copy_from_user(&atreq, arg, sizeof(atreq))) 675 return -EFAULT; 676 677 dev = __dev_get_by_name(&init_net, atreq.ifr_name); 678 if (!dev) 679 return -ENODEV; 680 681 sa = (struct sockaddr_at *)&atreq.ifr_addr; 682 atif = atalk_find_dev(dev); 683 684 switch (cmd) { 685 case SIOCSIFADDR: 686 if (!capable(CAP_NET_ADMIN)) 687 return -EPERM; 688 if (sa->sat_family != AF_APPLETALK) 689 return -EINVAL; 690 if (dev->type != ARPHRD_ETHER && 691 dev->type != ARPHRD_LOOPBACK && 692 dev->type != ARPHRD_LOCALTLK && 693 dev->type != ARPHRD_PPP) 694 return -EPROTONOSUPPORT; 695 696 nr = (struct atalk_netrange *)&sa->sat_zero[0]; 697 add_route = 1; 698 699 /* 700 * if this is a point-to-point iface, and we already 701 * have an iface for this AppleTalk address, then we 702 * should not add a route 703 */ 704 if ((dev->flags & IFF_POINTOPOINT) && 705 atalk_find_interface(sa->sat_addr.s_net, 706 sa->sat_addr.s_node)) { 707 printk(KERN_DEBUG "AppleTalk: point-to-point " 708 "interface added with " 709 "existing address\n"); 710 add_route = 0; 711 } 712 713 /* 714 * Phase 1 is fine on LocalTalk but we don't do 715 * EtherTalk phase 1. Anyone wanting to add it go ahead. 716 */ 717 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) 718 return -EPROTONOSUPPORT; 719 if (sa->sat_addr.s_node == ATADDR_BCAST || 720 sa->sat_addr.s_node == 254) 721 return -EINVAL; 722 if (atif) { 723 /* Already setting address */ 724 if (atif->status & ATIF_PROBE) 725 return -EBUSY; 726 727 atif->address.s_net = sa->sat_addr.s_net; 728 atif->address.s_node = sa->sat_addr.s_node; 729 atrtr_device_down(dev); /* Flush old routes */ 730 } else { 731 atif = atif_add_device(dev, &sa->sat_addr); 732 if (!atif) 733 return -ENOMEM; 734 } 735 atif->nets = *nr; 736 737 /* 738 * Check if the chosen address is used. If so we 739 * error and atalkd will try another. 740 */ 741 742 if (!(dev->flags & IFF_LOOPBACK) && 743 !(dev->flags & IFF_POINTOPOINT) && 744 atif_probe_device(atif) < 0) { 745 atif_drop_device(dev); 746 return -EADDRINUSE; 747 } 748 749 /* Hey it worked - add the direct routes */ 750 sa = (struct sockaddr_at *)&rtdef.rt_gateway; 751 sa->sat_family = AF_APPLETALK; 752 sa->sat_addr.s_net = atif->address.s_net; 753 sa->sat_addr.s_node = atif->address.s_node; 754 sa = (struct sockaddr_at *)&rtdef.rt_dst; 755 rtdef.rt_flags = RTF_UP; 756 sa->sat_family = AF_APPLETALK; 757 sa->sat_addr.s_node = ATADDR_ANYNODE; 758 if (dev->flags & IFF_LOOPBACK || 759 dev->flags & IFF_POINTOPOINT) 760 rtdef.rt_flags |= RTF_HOST; 761 762 /* Routerless initial state */ 763 if (nr->nr_firstnet == htons(0) && 764 nr->nr_lastnet == htons(0xFFFE)) { 765 sa->sat_addr.s_net = atif->address.s_net; 766 atrtr_create(&rtdef, dev); 767 atrtr_set_default(dev); 768 } else { 769 limit = ntohs(nr->nr_lastnet); 770 if (limit - ntohs(nr->nr_firstnet) > 4096) { 771 printk(KERN_WARNING "Too many routes/" 772 "iface.\n"); 773 return -EINVAL; 774 } 775 if (add_route) 776 for (ct = ntohs(nr->nr_firstnet); 777 ct <= limit; ct++) { 778 sa->sat_addr.s_net = htons(ct); 779 atrtr_create(&rtdef, dev); 780 } 781 } 782 dev_mc_add_global(dev, aarp_mcast); 783 return 0; 784 785 case SIOCGIFADDR: 786 if (!atif) 787 return -EADDRNOTAVAIL; 788 789 sa->sat_family = AF_APPLETALK; 790 sa->sat_addr = atif->address; 791 break; 792 793 case SIOCGIFBRDADDR: 794 if (!atif) 795 return -EADDRNOTAVAIL; 796 797 sa->sat_family = AF_APPLETALK; 798 sa->sat_addr.s_net = atif->address.s_net; 799 sa->sat_addr.s_node = ATADDR_BCAST; 800 break; 801 802 case SIOCATALKDIFADDR: 803 case SIOCDIFADDR: 804 if (!capable(CAP_NET_ADMIN)) 805 return -EPERM; 806 if (sa->sat_family != AF_APPLETALK) 807 return -EINVAL; 808 atalk_dev_down(dev); 809 break; 810 811 case SIOCSARP: 812 if (!capable(CAP_NET_ADMIN)) 813 return -EPERM; 814 if (sa->sat_family != AF_APPLETALK) 815 return -EINVAL; 816 /* 817 * for now, we only support proxy AARP on ELAP; 818 * we should be able to do it for LocalTalk, too. 819 */ 820 if (dev->type != ARPHRD_ETHER) 821 return -EPROTONOSUPPORT; 822 823 /* 824 * atif points to the current interface on this network; 825 * we aren't concerned about its current status (at 826 * least for now), but it has all the settings about 827 * the network we're going to probe. Consequently, it 828 * must exist. 829 */ 830 if (!atif) 831 return -EADDRNOTAVAIL; 832 833 nr = (struct atalk_netrange *)&(atif->nets); 834 /* 835 * Phase 1 is fine on Localtalk but we don't do 836 * Ethertalk phase 1. Anyone wanting to add it go ahead. 837 */ 838 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) 839 return -EPROTONOSUPPORT; 840 841 if (sa->sat_addr.s_node == ATADDR_BCAST || 842 sa->sat_addr.s_node == 254) 843 return -EINVAL; 844 845 /* 846 * Check if the chosen address is used. If so we 847 * error and ATCP will try another. 848 */ 849 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0) 850 return -EADDRINUSE; 851 852 /* 853 * We now have an address on the local network, and 854 * the AARP code will defend it for us until we take it 855 * down. We don't set up any routes right now, because 856 * ATCP will install them manually via SIOCADDRT. 857 */ 858 break; 859 860 case SIOCDARP: 861 if (!capable(CAP_NET_ADMIN)) 862 return -EPERM; 863 if (sa->sat_family != AF_APPLETALK) 864 return -EINVAL; 865 if (!atif) 866 return -EADDRNOTAVAIL; 867 868 /* give to aarp module to remove proxy entry */ 869 aarp_proxy_remove(atif->dev, &(sa->sat_addr)); 870 return 0; 871 } 872 873 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0; 874 } 875 876 /* Routing ioctl() calls */ 877 static int atrtr_ioctl(unsigned int cmd, void __user *arg) 878 { 879 struct rtentry rt; 880 881 if (copy_from_user(&rt, arg, sizeof(rt))) 882 return -EFAULT; 883 884 switch (cmd) { 885 case SIOCDELRT: 886 if (rt.rt_dst.sa_family != AF_APPLETALK) 887 return -EINVAL; 888 return atrtr_delete(&((struct sockaddr_at *) 889 &rt.rt_dst)->sat_addr); 890 891 case SIOCADDRT: { 892 struct net_device *dev = NULL; 893 if (rt.rt_dev) { 894 char name[IFNAMSIZ]; 895 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1)) 896 return -EFAULT; 897 name[IFNAMSIZ-1] = '\0'; 898 dev = __dev_get_by_name(&init_net, name); 899 if (!dev) 900 return -ENODEV; 901 } 902 return atrtr_create(&rt, dev); 903 } 904 } 905 return -EINVAL; 906 } 907 908 /**************************************************************************\ 909 * * 910 * Handling for system calls applied via the various interfaces to an * 911 * AppleTalk socket object. * 912 * * 913 \**************************************************************************/ 914 915 /* 916 * Checksum: This is 'optional'. It's quite likely also a good 917 * candidate for assembler hackery 8) 918 */ 919 static unsigned long atalk_sum_partial(const unsigned char *data, 920 int len, unsigned long sum) 921 { 922 /* This ought to be unwrapped neatly. I'll trust gcc for now */ 923 while (len--) { 924 sum += *data++; 925 sum = rol16(sum, 1); 926 } 927 return sum; 928 } 929 930 /* Checksum skb data -- similar to skb_checksum */ 931 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset, 932 int len, unsigned long sum) 933 { 934 int start = skb_headlen(skb); 935 struct sk_buff *frag_iter; 936 int i, copy; 937 938 /* checksum stuff in header space */ 939 if ((copy = start - offset) > 0) { 940 if (copy > len) 941 copy = len; 942 sum = atalk_sum_partial(skb->data + offset, copy, sum); 943 if ((len -= copy) == 0) 944 return sum; 945 946 offset += copy; 947 } 948 949 /* checksum stuff in frags */ 950 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 951 int end; 952 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 953 WARN_ON(start > offset + len); 954 955 end = start + skb_frag_size(frag); 956 if ((copy = end - offset) > 0) { 957 u8 *vaddr; 958 959 if (copy > len) 960 copy = len; 961 vaddr = kmap_atomic(skb_frag_page(frag)); 962 sum = atalk_sum_partial(vaddr + frag->page_offset + 963 offset - start, copy, sum); 964 kunmap_atomic(vaddr); 965 966 if (!(len -= copy)) 967 return sum; 968 offset += copy; 969 } 970 start = end; 971 } 972 973 skb_walk_frags(skb, frag_iter) { 974 int end; 975 976 WARN_ON(start > offset + len); 977 978 end = start + frag_iter->len; 979 if ((copy = end - offset) > 0) { 980 if (copy > len) 981 copy = len; 982 sum = atalk_sum_skb(frag_iter, offset - start, 983 copy, sum); 984 if ((len -= copy) == 0) 985 return sum; 986 offset += copy; 987 } 988 start = end; 989 } 990 991 BUG_ON(len > 0); 992 993 return sum; 994 } 995 996 static __be16 atalk_checksum(const struct sk_buff *skb, int len) 997 { 998 unsigned long sum; 999 1000 /* skip header 4 bytes */ 1001 sum = atalk_sum_skb(skb, 4, len-4, 0); 1002 1003 /* Use 0xFFFF for 0. 0 itself means none */ 1004 return sum ? htons((unsigned short)sum) : htons(0xFFFF); 1005 } 1006 1007 static struct proto ddp_proto = { 1008 .name = "DDP", 1009 .owner = THIS_MODULE, 1010 .obj_size = sizeof(struct atalk_sock), 1011 }; 1012 1013 /* 1014 * Create a socket. Initialise the socket, blank the addresses 1015 * set the state. 1016 */ 1017 static int atalk_create(struct net *net, struct socket *sock, int protocol, 1018 int kern) 1019 { 1020 struct sock *sk; 1021 int rc = -ESOCKTNOSUPPORT; 1022 1023 if (!net_eq(net, &init_net)) 1024 return -EAFNOSUPPORT; 1025 1026 /* 1027 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do 1028 * and gives you the full ELAP frame. Should be handy for CAP 8) 1029 */ 1030 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 1031 goto out; 1032 rc = -ENOMEM; 1033 sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto, kern); 1034 if (!sk) 1035 goto out; 1036 rc = 0; 1037 sock->ops = &atalk_dgram_ops; 1038 sock_init_data(sock, sk); 1039 1040 /* Checksums on by default */ 1041 sock_set_flag(sk, SOCK_ZAPPED); 1042 out: 1043 return rc; 1044 } 1045 1046 /* Free a socket. No work needed */ 1047 static int atalk_release(struct socket *sock) 1048 { 1049 struct sock *sk = sock->sk; 1050 1051 if (sk) { 1052 sock_hold(sk); 1053 lock_sock(sk); 1054 1055 sock_orphan(sk); 1056 sock->sk = NULL; 1057 atalk_destroy_socket(sk); 1058 1059 release_sock(sk); 1060 sock_put(sk); 1061 } 1062 return 0; 1063 } 1064 1065 /** 1066 * atalk_pick_and_bind_port - Pick a source port when one is not given 1067 * @sk: socket to insert into the tables 1068 * @sat: address to search for 1069 * 1070 * Pick a source port when one is not given. If we can find a suitable free 1071 * one, we insert the socket into the tables using it. 1072 * 1073 * This whole operation must be atomic. 1074 */ 1075 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat) 1076 { 1077 int retval; 1078 1079 write_lock_bh(&atalk_sockets_lock); 1080 1081 for (sat->sat_port = ATPORT_RESERVED; 1082 sat->sat_port < ATPORT_LAST; 1083 sat->sat_port++) { 1084 struct sock *s; 1085 1086 sk_for_each(s, &atalk_sockets) { 1087 struct atalk_sock *at = at_sk(s); 1088 1089 if (at->src_net == sat->sat_addr.s_net && 1090 at->src_node == sat->sat_addr.s_node && 1091 at->src_port == sat->sat_port) 1092 goto try_next_port; 1093 } 1094 1095 /* Wheee, it's free, assign and insert. */ 1096 __atalk_insert_socket(sk); 1097 at_sk(sk)->src_port = sat->sat_port; 1098 retval = 0; 1099 goto out; 1100 1101 try_next_port:; 1102 } 1103 1104 retval = -EBUSY; 1105 out: 1106 write_unlock_bh(&atalk_sockets_lock); 1107 return retval; 1108 } 1109 1110 static int atalk_autobind(struct sock *sk) 1111 { 1112 struct atalk_sock *at = at_sk(sk); 1113 struct sockaddr_at sat; 1114 struct atalk_addr *ap = atalk_find_primary(); 1115 int n = -EADDRNOTAVAIL; 1116 1117 if (!ap || ap->s_net == htons(ATADDR_ANYNET)) 1118 goto out; 1119 1120 at->src_net = sat.sat_addr.s_net = ap->s_net; 1121 at->src_node = sat.sat_addr.s_node = ap->s_node; 1122 1123 n = atalk_pick_and_bind_port(sk, &sat); 1124 if (!n) 1125 sock_reset_flag(sk, SOCK_ZAPPED); 1126 out: 1127 return n; 1128 } 1129 1130 /* Set the address 'our end' of the connection */ 1131 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 1132 { 1133 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr; 1134 struct sock *sk = sock->sk; 1135 struct atalk_sock *at = at_sk(sk); 1136 int err; 1137 1138 if (!sock_flag(sk, SOCK_ZAPPED) || 1139 addr_len != sizeof(struct sockaddr_at)) 1140 return -EINVAL; 1141 1142 if (addr->sat_family != AF_APPLETALK) 1143 return -EAFNOSUPPORT; 1144 1145 lock_sock(sk); 1146 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) { 1147 struct atalk_addr *ap = atalk_find_primary(); 1148 1149 err = -EADDRNOTAVAIL; 1150 if (!ap) 1151 goto out; 1152 1153 at->src_net = addr->sat_addr.s_net = ap->s_net; 1154 at->src_node = addr->sat_addr.s_node = ap->s_node; 1155 } else { 1156 err = -EADDRNOTAVAIL; 1157 if (!atalk_find_interface(addr->sat_addr.s_net, 1158 addr->sat_addr.s_node)) 1159 goto out; 1160 1161 at->src_net = addr->sat_addr.s_net; 1162 at->src_node = addr->sat_addr.s_node; 1163 } 1164 1165 if (addr->sat_port == ATADDR_ANYPORT) { 1166 err = atalk_pick_and_bind_port(sk, addr); 1167 1168 if (err < 0) 1169 goto out; 1170 } else { 1171 at->src_port = addr->sat_port; 1172 1173 err = -EADDRINUSE; 1174 if (atalk_find_or_insert_socket(sk, addr)) 1175 goto out; 1176 } 1177 1178 sock_reset_flag(sk, SOCK_ZAPPED); 1179 err = 0; 1180 out: 1181 release_sock(sk); 1182 return err; 1183 } 1184 1185 /* Set the address we talk to */ 1186 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr, 1187 int addr_len, int flags) 1188 { 1189 struct sock *sk = sock->sk; 1190 struct atalk_sock *at = at_sk(sk); 1191 struct sockaddr_at *addr; 1192 int err; 1193 1194 sk->sk_state = TCP_CLOSE; 1195 sock->state = SS_UNCONNECTED; 1196 1197 if (addr_len != sizeof(*addr)) 1198 return -EINVAL; 1199 1200 addr = (struct sockaddr_at *)uaddr; 1201 1202 if (addr->sat_family != AF_APPLETALK) 1203 return -EAFNOSUPPORT; 1204 1205 if (addr->sat_addr.s_node == ATADDR_BCAST && 1206 !sock_flag(sk, SOCK_BROADCAST)) { 1207 #if 1 1208 pr_warn("atalk_connect: %s is broken and did not set SO_BROADCAST.\n", 1209 current->comm); 1210 #else 1211 return -EACCES; 1212 #endif 1213 } 1214 1215 lock_sock(sk); 1216 err = -EBUSY; 1217 if (sock_flag(sk, SOCK_ZAPPED)) 1218 if (atalk_autobind(sk) < 0) 1219 goto out; 1220 1221 err = -ENETUNREACH; 1222 if (!atrtr_get_dev(&addr->sat_addr)) 1223 goto out; 1224 1225 at->dest_port = addr->sat_port; 1226 at->dest_net = addr->sat_addr.s_net; 1227 at->dest_node = addr->sat_addr.s_node; 1228 1229 sock->state = SS_CONNECTED; 1230 sk->sk_state = TCP_ESTABLISHED; 1231 err = 0; 1232 out: 1233 release_sock(sk); 1234 return err; 1235 } 1236 1237 /* 1238 * Find the name of an AppleTalk socket. Just copy the right 1239 * fields into the sockaddr. 1240 */ 1241 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr, 1242 int *uaddr_len, int peer) 1243 { 1244 struct sockaddr_at sat; 1245 struct sock *sk = sock->sk; 1246 struct atalk_sock *at = at_sk(sk); 1247 int err; 1248 1249 lock_sock(sk); 1250 err = -ENOBUFS; 1251 if (sock_flag(sk, SOCK_ZAPPED)) 1252 if (atalk_autobind(sk) < 0) 1253 goto out; 1254 1255 *uaddr_len = sizeof(struct sockaddr_at); 1256 memset(&sat, 0, sizeof(sat)); 1257 1258 if (peer) { 1259 err = -ENOTCONN; 1260 if (sk->sk_state != TCP_ESTABLISHED) 1261 goto out; 1262 1263 sat.sat_addr.s_net = at->dest_net; 1264 sat.sat_addr.s_node = at->dest_node; 1265 sat.sat_port = at->dest_port; 1266 } else { 1267 sat.sat_addr.s_net = at->src_net; 1268 sat.sat_addr.s_node = at->src_node; 1269 sat.sat_port = at->src_port; 1270 } 1271 1272 err = 0; 1273 sat.sat_family = AF_APPLETALK; 1274 memcpy(uaddr, &sat, sizeof(sat)); 1275 1276 out: 1277 release_sock(sk); 1278 return err; 1279 } 1280 1281 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE) 1282 static __inline__ int is_ip_over_ddp(struct sk_buff *skb) 1283 { 1284 return skb->data[12] == 22; 1285 } 1286 1287 static int handle_ip_over_ddp(struct sk_buff *skb) 1288 { 1289 struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0"); 1290 struct net_device_stats *stats; 1291 1292 /* This needs to be able to handle ipddp"N" devices */ 1293 if (!dev) { 1294 kfree_skb(skb); 1295 return NET_RX_DROP; 1296 } 1297 1298 skb->protocol = htons(ETH_P_IP); 1299 skb_pull(skb, 13); 1300 skb->dev = dev; 1301 skb_reset_transport_header(skb); 1302 1303 stats = netdev_priv(dev); 1304 stats->rx_packets++; 1305 stats->rx_bytes += skb->len + 13; 1306 return netif_rx(skb); /* Send the SKB up to a higher place. */ 1307 } 1308 #else 1309 /* make it easy for gcc to optimize this test out, i.e. kill the code */ 1310 #define is_ip_over_ddp(skb) 0 1311 #define handle_ip_over_ddp(skb) 0 1312 #endif 1313 1314 static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev, 1315 struct ddpehdr *ddp, __u16 len_hops, int origlen) 1316 { 1317 struct atalk_route *rt; 1318 struct atalk_addr ta; 1319 1320 /* 1321 * Don't route multicast, etc., packets, or packets sent to "this 1322 * network" 1323 */ 1324 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) { 1325 /* 1326 * FIXME: 1327 * 1328 * Can it ever happen that a packet is from a PPP iface and 1329 * needs to be broadcast onto the default network? 1330 */ 1331 if (dev->type == ARPHRD_PPP) 1332 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast " 1333 "packet received from PPP iface\n"); 1334 goto free_it; 1335 } 1336 1337 ta.s_net = ddp->deh_dnet; 1338 ta.s_node = ddp->deh_dnode; 1339 1340 /* Route the packet */ 1341 rt = atrtr_find(&ta); 1342 /* increment hops count */ 1343 len_hops += 1 << 10; 1344 if (!rt || !(len_hops & (15 << 10))) 1345 goto free_it; 1346 1347 /* FIXME: use skb->cb to be able to use shared skbs */ 1348 1349 /* 1350 * Route goes through another gateway, so set the target to the 1351 * gateway instead. 1352 */ 1353 1354 if (rt->flags & RTF_GATEWAY) { 1355 ta.s_net = rt->gateway.s_net; 1356 ta.s_node = rt->gateway.s_node; 1357 } 1358 1359 /* Fix up skb->len field */ 1360 skb_trim(skb, min_t(unsigned int, origlen, 1361 (rt->dev->hard_header_len + 1362 ddp_dl->header_length + (len_hops & 1023)))); 1363 1364 /* FIXME: use skb->cb to be able to use shared skbs */ 1365 ddp->deh_len_hops = htons(len_hops); 1366 1367 /* 1368 * Send the buffer onwards 1369 * 1370 * Now we must always be careful. If it's come from LocalTalk to 1371 * EtherTalk it might not fit 1372 * 1373 * Order matters here: If a packet has to be copied to make a new 1374 * headroom (rare hopefully) then it won't need unsharing. 1375 * 1376 * Note. ddp-> becomes invalid at the realloc. 1377 */ 1378 if (skb_headroom(skb) < 22) { 1379 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */ 1380 struct sk_buff *nskb = skb_realloc_headroom(skb, 32); 1381 kfree_skb(skb); 1382 skb = nskb; 1383 } else 1384 skb = skb_unshare(skb, GFP_ATOMIC); 1385 1386 /* 1387 * If the buffer didn't vanish into the lack of space bitbucket we can 1388 * send it. 1389 */ 1390 if (skb == NULL) 1391 goto drop; 1392 1393 if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP) 1394 return NET_RX_DROP; 1395 return NET_RX_SUCCESS; 1396 free_it: 1397 kfree_skb(skb); 1398 drop: 1399 return NET_RX_DROP; 1400 } 1401 1402 /** 1403 * atalk_rcv - Receive a packet (in skb) from device dev 1404 * @skb - packet received 1405 * @dev - network device where the packet comes from 1406 * @pt - packet type 1407 * 1408 * Receive a packet (in skb) from device dev. This has come from the SNAP 1409 * decoder, and on entry skb->transport_header is the DDP header, skb->len 1410 * is the DDP header, skb->len is the DDP length. The physical headers 1411 * have been extracted. PPP should probably pass frames marked as for this 1412 * layer. [ie ARPHRD_ETHERTALK] 1413 */ 1414 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev, 1415 struct packet_type *pt, struct net_device *orig_dev) 1416 { 1417 struct ddpehdr *ddp; 1418 struct sock *sock; 1419 struct atalk_iface *atif; 1420 struct sockaddr_at tosat; 1421 int origlen; 1422 __u16 len_hops; 1423 1424 if (!net_eq(dev_net(dev), &init_net)) 1425 goto drop; 1426 1427 /* Don't mangle buffer if shared */ 1428 if (!(skb = skb_share_check(skb, GFP_ATOMIC))) 1429 goto out; 1430 1431 /* Size check and make sure header is contiguous */ 1432 if (!pskb_may_pull(skb, sizeof(*ddp))) 1433 goto drop; 1434 1435 ddp = ddp_hdr(skb); 1436 1437 len_hops = ntohs(ddp->deh_len_hops); 1438 1439 /* Trim buffer in case of stray trailing data */ 1440 origlen = skb->len; 1441 skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023)); 1442 1443 /* 1444 * Size check to see if ddp->deh_len was crap 1445 * (Otherwise we'll detonate most spectacularly 1446 * in the middle of atalk_checksum() or recvmsg()). 1447 */ 1448 if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) { 1449 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, " 1450 "skb->len=%u)\n", len_hops & 1023, skb->len); 1451 goto drop; 1452 } 1453 1454 /* 1455 * Any checksums. Note we don't do htons() on this == is assumed to be 1456 * valid for net byte orders all over the networking code... 1457 */ 1458 if (ddp->deh_sum && 1459 atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum) 1460 /* Not a valid AppleTalk frame - dustbin time */ 1461 goto drop; 1462 1463 /* Check the packet is aimed at us */ 1464 if (!ddp->deh_dnet) /* Net 0 is 'this network' */ 1465 atif = atalk_find_anynet(ddp->deh_dnode, dev); 1466 else 1467 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode); 1468 1469 if (!atif) { 1470 /* Not ours, so we route the packet via the correct 1471 * AppleTalk iface 1472 */ 1473 return atalk_route_packet(skb, dev, ddp, len_hops, origlen); 1474 } 1475 1476 /* if IP over DDP is not selected this code will be optimized out */ 1477 if (is_ip_over_ddp(skb)) 1478 return handle_ip_over_ddp(skb); 1479 /* 1480 * Which socket - atalk_search_socket() looks for a *full match* 1481 * of the <net, node, port> tuple. 1482 */ 1483 tosat.sat_addr.s_net = ddp->deh_dnet; 1484 tosat.sat_addr.s_node = ddp->deh_dnode; 1485 tosat.sat_port = ddp->deh_dport; 1486 1487 sock = atalk_search_socket(&tosat, atif); 1488 if (!sock) /* But not one of our sockets */ 1489 goto drop; 1490 1491 /* Queue packet (standard) */ 1492 if (sock_queue_rcv_skb(sock, skb) < 0) 1493 goto drop; 1494 1495 return NET_RX_SUCCESS; 1496 1497 drop: 1498 kfree_skb(skb); 1499 out: 1500 return NET_RX_DROP; 1501 1502 } 1503 1504 /* 1505 * Receive a LocalTalk frame. We make some demands on the caller here. 1506 * Caller must provide enough headroom on the packet to pull the short 1507 * header and append a long one. 1508 */ 1509 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev, 1510 struct packet_type *pt, struct net_device *orig_dev) 1511 { 1512 if (!net_eq(dev_net(dev), &init_net)) 1513 goto freeit; 1514 1515 /* Expand any short form frames */ 1516 if (skb_mac_header(skb)[2] == 1) { 1517 struct ddpehdr *ddp; 1518 /* Find our address */ 1519 struct atalk_addr *ap = atalk_find_dev_addr(dev); 1520 1521 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023) 1522 goto freeit; 1523 1524 /* Don't mangle buffer if shared */ 1525 if (!(skb = skb_share_check(skb, GFP_ATOMIC))) 1526 return 0; 1527 1528 /* 1529 * The push leaves us with a ddephdr not an shdr, and 1530 * handily the port bytes in the right place preset. 1531 */ 1532 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4); 1533 1534 /* Now fill in the long header */ 1535 1536 /* 1537 * These two first. The mac overlays the new source/dest 1538 * network information so we MUST copy these before 1539 * we write the network numbers ! 1540 */ 1541 1542 ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */ 1543 ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */ 1544 1545 ddp->deh_dnet = ap->s_net; /* Network number */ 1546 ddp->deh_snet = ap->s_net; 1547 ddp->deh_sum = 0; /* No checksum */ 1548 /* 1549 * Not sure about this bit... 1550 */ 1551 /* Non routable, so force a drop if we slip up later */ 1552 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10)); 1553 } 1554 skb_reset_transport_header(skb); 1555 1556 return atalk_rcv(skb, dev, pt, orig_dev); 1557 freeit: 1558 kfree_skb(skb); 1559 return 0; 1560 } 1561 1562 static int atalk_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1563 { 1564 struct sock *sk = sock->sk; 1565 struct atalk_sock *at = at_sk(sk); 1566 DECLARE_SOCKADDR(struct sockaddr_at *, usat, msg->msg_name); 1567 int flags = msg->msg_flags; 1568 int loopback = 0; 1569 struct sockaddr_at local_satalk, gsat; 1570 struct sk_buff *skb; 1571 struct net_device *dev; 1572 struct ddpehdr *ddp; 1573 int size; 1574 struct atalk_route *rt; 1575 int err; 1576 1577 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) 1578 return -EINVAL; 1579 1580 if (len > DDP_MAXSZ) 1581 return -EMSGSIZE; 1582 1583 lock_sock(sk); 1584 if (usat) { 1585 err = -EBUSY; 1586 if (sock_flag(sk, SOCK_ZAPPED)) 1587 if (atalk_autobind(sk) < 0) 1588 goto out; 1589 1590 err = -EINVAL; 1591 if (msg->msg_namelen < sizeof(*usat) || 1592 usat->sat_family != AF_APPLETALK) 1593 goto out; 1594 1595 err = -EPERM; 1596 /* netatalk didn't implement this check */ 1597 if (usat->sat_addr.s_node == ATADDR_BCAST && 1598 !sock_flag(sk, SOCK_BROADCAST)) { 1599 goto out; 1600 } 1601 } else { 1602 err = -ENOTCONN; 1603 if (sk->sk_state != TCP_ESTABLISHED) 1604 goto out; 1605 usat = &local_satalk; 1606 usat->sat_family = AF_APPLETALK; 1607 usat->sat_port = at->dest_port; 1608 usat->sat_addr.s_node = at->dest_node; 1609 usat->sat_addr.s_net = at->dest_net; 1610 } 1611 1612 /* Build a packet */ 1613 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk); 1614 1615 /* For headers */ 1616 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length; 1617 1618 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) { 1619 rt = atrtr_find(&usat->sat_addr); 1620 } else { 1621 struct atalk_addr at_hint; 1622 1623 at_hint.s_node = 0; 1624 at_hint.s_net = at->src_net; 1625 1626 rt = atrtr_find(&at_hint); 1627 } 1628 err = ENETUNREACH; 1629 if (!rt) 1630 goto out; 1631 1632 dev = rt->dev; 1633 1634 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n", 1635 sk, size, dev->name); 1636 1637 size += dev->hard_header_len; 1638 release_sock(sk); 1639 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err); 1640 lock_sock(sk); 1641 if (!skb) 1642 goto out; 1643 1644 skb_reserve(skb, ddp_dl->header_length); 1645 skb_reserve(skb, dev->hard_header_len); 1646 skb->dev = dev; 1647 1648 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk); 1649 1650 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr)); 1651 ddp->deh_len_hops = htons(len + sizeof(*ddp)); 1652 ddp->deh_dnet = usat->sat_addr.s_net; 1653 ddp->deh_snet = at->src_net; 1654 ddp->deh_dnode = usat->sat_addr.s_node; 1655 ddp->deh_snode = at->src_node; 1656 ddp->deh_dport = usat->sat_port; 1657 ddp->deh_sport = at->src_port; 1658 1659 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len); 1660 1661 err = memcpy_from_msg(skb_put(skb, len), msg, len); 1662 if (err) { 1663 kfree_skb(skb); 1664 err = -EFAULT; 1665 goto out; 1666 } 1667 1668 if (sk->sk_no_check_tx) 1669 ddp->deh_sum = 0; 1670 else 1671 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp)); 1672 1673 /* 1674 * Loopback broadcast packets to non gateway targets (ie routes 1675 * to group we are in) 1676 */ 1677 if (ddp->deh_dnode == ATADDR_BCAST && 1678 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) { 1679 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL); 1680 1681 if (skb2) { 1682 loopback = 1; 1683 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk); 1684 /* 1685 * If it fails it is queued/sent above in the aarp queue 1686 */ 1687 aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL); 1688 } 1689 } 1690 1691 if (dev->flags & IFF_LOOPBACK || loopback) { 1692 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk); 1693 /* loop back */ 1694 skb_orphan(skb); 1695 if (ddp->deh_dnode == ATADDR_BCAST) { 1696 struct atalk_addr at_lo; 1697 1698 at_lo.s_node = 0; 1699 at_lo.s_net = 0; 1700 1701 rt = atrtr_find(&at_lo); 1702 if (!rt) { 1703 kfree_skb(skb); 1704 err = -ENETUNREACH; 1705 goto out; 1706 } 1707 dev = rt->dev; 1708 skb->dev = dev; 1709 } 1710 ddp_dl->request(ddp_dl, skb, dev->dev_addr); 1711 } else { 1712 SOCK_DEBUG(sk, "SK %p: send out.\n", sk); 1713 if (rt->flags & RTF_GATEWAY) { 1714 gsat.sat_addr = rt->gateway; 1715 usat = &gsat; 1716 } 1717 1718 /* 1719 * If it fails it is queued/sent above in the aarp queue 1720 */ 1721 aarp_send_ddp(dev, skb, &usat->sat_addr, NULL); 1722 } 1723 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len); 1724 1725 out: 1726 release_sock(sk); 1727 return err ? : len; 1728 } 1729 1730 static int atalk_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1731 int flags) 1732 { 1733 struct sock *sk = sock->sk; 1734 struct ddpehdr *ddp; 1735 int copied = 0; 1736 int offset = 0; 1737 int err = 0; 1738 struct sk_buff *skb; 1739 1740 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1741 flags & MSG_DONTWAIT, &err); 1742 lock_sock(sk); 1743 1744 if (!skb) 1745 goto out; 1746 1747 /* FIXME: use skb->cb to be able to use shared skbs */ 1748 ddp = ddp_hdr(skb); 1749 copied = ntohs(ddp->deh_len_hops) & 1023; 1750 1751 if (sk->sk_type != SOCK_RAW) { 1752 offset = sizeof(*ddp); 1753 copied -= offset; 1754 } 1755 1756 if (copied > size) { 1757 copied = size; 1758 msg->msg_flags |= MSG_TRUNC; 1759 } 1760 err = skb_copy_datagram_msg(skb, offset, msg, copied); 1761 1762 if (!err && msg->msg_name) { 1763 DECLARE_SOCKADDR(struct sockaddr_at *, sat, msg->msg_name); 1764 sat->sat_family = AF_APPLETALK; 1765 sat->sat_port = ddp->deh_sport; 1766 sat->sat_addr.s_node = ddp->deh_snode; 1767 sat->sat_addr.s_net = ddp->deh_snet; 1768 msg->msg_namelen = sizeof(*sat); 1769 } 1770 1771 skb_free_datagram(sk, skb); /* Free the datagram. */ 1772 1773 out: 1774 release_sock(sk); 1775 return err ? : copied; 1776 } 1777 1778 1779 /* 1780 * AppleTalk ioctl calls. 1781 */ 1782 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1783 { 1784 int rc = -ENOIOCTLCMD; 1785 struct sock *sk = sock->sk; 1786 void __user *argp = (void __user *)arg; 1787 1788 switch (cmd) { 1789 /* Protocol layer */ 1790 case TIOCOUTQ: { 1791 long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1792 1793 if (amount < 0) 1794 amount = 0; 1795 rc = put_user(amount, (int __user *)argp); 1796 break; 1797 } 1798 case TIOCINQ: { 1799 /* 1800 * These two are safe on a single CPU system as only 1801 * user tasks fiddle here 1802 */ 1803 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); 1804 long amount = 0; 1805 1806 if (skb) 1807 amount = skb->len - sizeof(struct ddpehdr); 1808 rc = put_user(amount, (int __user *)argp); 1809 break; 1810 } 1811 case SIOCGSTAMP: 1812 rc = sock_get_timestamp(sk, argp); 1813 break; 1814 case SIOCGSTAMPNS: 1815 rc = sock_get_timestampns(sk, argp); 1816 break; 1817 /* Routing */ 1818 case SIOCADDRT: 1819 case SIOCDELRT: 1820 rc = -EPERM; 1821 if (capable(CAP_NET_ADMIN)) 1822 rc = atrtr_ioctl(cmd, argp); 1823 break; 1824 /* Interface */ 1825 case SIOCGIFADDR: 1826 case SIOCSIFADDR: 1827 case SIOCGIFBRDADDR: 1828 case SIOCATALKDIFADDR: 1829 case SIOCDIFADDR: 1830 case SIOCSARP: /* proxy AARP */ 1831 case SIOCDARP: /* proxy AARP */ 1832 rtnl_lock(); 1833 rc = atif_ioctl(cmd, argp); 1834 rtnl_unlock(); 1835 break; 1836 } 1837 1838 return rc; 1839 } 1840 1841 1842 #ifdef CONFIG_COMPAT 1843 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1844 { 1845 /* 1846 * SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we 1847 * cannot handle it in common code. The data we access if ifreq 1848 * here is compatible, so we can simply call the native 1849 * handler. 1850 */ 1851 if (cmd == SIOCATALKDIFADDR) 1852 return atalk_ioctl(sock, cmd, (unsigned long)compat_ptr(arg)); 1853 1854 return -ENOIOCTLCMD; 1855 } 1856 #endif 1857 1858 1859 static const struct net_proto_family atalk_family_ops = { 1860 .family = PF_APPLETALK, 1861 .create = atalk_create, 1862 .owner = THIS_MODULE, 1863 }; 1864 1865 static const struct proto_ops atalk_dgram_ops = { 1866 .family = PF_APPLETALK, 1867 .owner = THIS_MODULE, 1868 .release = atalk_release, 1869 .bind = atalk_bind, 1870 .connect = atalk_connect, 1871 .socketpair = sock_no_socketpair, 1872 .accept = sock_no_accept, 1873 .getname = atalk_getname, 1874 .poll = datagram_poll, 1875 .ioctl = atalk_ioctl, 1876 #ifdef CONFIG_COMPAT 1877 .compat_ioctl = atalk_compat_ioctl, 1878 #endif 1879 .listen = sock_no_listen, 1880 .shutdown = sock_no_shutdown, 1881 .setsockopt = sock_no_setsockopt, 1882 .getsockopt = sock_no_getsockopt, 1883 .sendmsg = atalk_sendmsg, 1884 .recvmsg = atalk_recvmsg, 1885 .mmap = sock_no_mmap, 1886 .sendpage = sock_no_sendpage, 1887 }; 1888 1889 static struct notifier_block ddp_notifier = { 1890 .notifier_call = ddp_device_event, 1891 }; 1892 1893 static struct packet_type ltalk_packet_type __read_mostly = { 1894 .type = cpu_to_be16(ETH_P_LOCALTALK), 1895 .func = ltalk_rcv, 1896 }; 1897 1898 static struct packet_type ppptalk_packet_type __read_mostly = { 1899 .type = cpu_to_be16(ETH_P_PPPTALK), 1900 .func = atalk_rcv, 1901 }; 1902 1903 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B }; 1904 1905 /* Export symbols for use by drivers when AppleTalk is a module */ 1906 EXPORT_SYMBOL(atrtr_get_dev); 1907 EXPORT_SYMBOL(atalk_find_dev_addr); 1908 1909 static const char atalk_err_snap[] __initconst = 1910 KERN_CRIT "Unable to register DDP with SNAP.\n"; 1911 1912 /* Called by proto.c on kernel start up */ 1913 static int __init atalk_init(void) 1914 { 1915 int rc = proto_register(&ddp_proto, 0); 1916 1917 if (rc != 0) 1918 goto out; 1919 1920 (void)sock_register(&atalk_family_ops); 1921 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv); 1922 if (!ddp_dl) 1923 printk(atalk_err_snap); 1924 1925 dev_add_pack(<alk_packet_type); 1926 dev_add_pack(&ppptalk_packet_type); 1927 1928 register_netdevice_notifier(&ddp_notifier); 1929 aarp_proto_init(); 1930 atalk_proc_init(); 1931 atalk_register_sysctl(); 1932 out: 1933 return rc; 1934 } 1935 module_init(atalk_init); 1936 1937 /* 1938 * No explicit module reference count manipulation is needed in the 1939 * protocol. Socket layer sets module reference count for us 1940 * and interfaces reference counting is done 1941 * by the network device layer. 1942 * 1943 * Ergo, before the AppleTalk module can be removed, all AppleTalk 1944 * sockets be closed from user space. 1945 */ 1946 static void __exit atalk_exit(void) 1947 { 1948 #ifdef CONFIG_SYSCTL 1949 atalk_unregister_sysctl(); 1950 #endif /* CONFIG_SYSCTL */ 1951 atalk_proc_exit(); 1952 aarp_cleanup_module(); /* General aarp clean-up. */ 1953 unregister_netdevice_notifier(&ddp_notifier); 1954 dev_remove_pack(<alk_packet_type); 1955 dev_remove_pack(&ppptalk_packet_type); 1956 unregister_snap_client(ddp_dl); 1957 sock_unregister(PF_APPLETALK); 1958 proto_unregister(&ddp_proto); 1959 } 1960 module_exit(atalk_exit); 1961 1962 MODULE_LICENSE("GPL"); 1963 MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>"); 1964 MODULE_DESCRIPTION("AppleTalk 0.20\n"); 1965 MODULE_ALIAS_NETPROTO(PF_APPLETALK); 1966