1 /* 2 * DDP: An implementation of the AppleTalk DDP protocol for 3 * Ethernet 'ELAP'. 4 * 5 * Alan Cox <Alan.Cox@linux.org> 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 <net/datalink.h> 59 #include <net/psnap.h> 60 #include <net/sock.h> 61 #include <net/tcp_states.h> 62 #include <net/route.h> 63 #include <linux/atalk.h> 64 #include "../core/kmap_skb.h" 65 66 struct datalink_proto *ddp_dl, *aarp_dl; 67 static const struct proto_ops atalk_dgram_ops; 68 69 /**************************************************************************\ 70 * * 71 * Handlers for the socket list. * 72 * * 73 \**************************************************************************/ 74 75 HLIST_HEAD(atalk_sockets); 76 DEFINE_RWLOCK(atalk_sockets_lock); 77 78 static inline void __atalk_insert_socket(struct sock *sk) 79 { 80 sk_add_node(sk, &atalk_sockets); 81 } 82 83 static inline void atalk_remove_socket(struct sock *sk) 84 { 85 write_lock_bh(&atalk_sockets_lock); 86 sk_del_node_init(sk); 87 write_unlock_bh(&atalk_sockets_lock); 88 } 89 90 static struct sock *atalk_search_socket(struct sockaddr_at *to, 91 struct atalk_iface *atif) 92 { 93 struct sock *s; 94 struct hlist_node *node; 95 96 read_lock_bh(&atalk_sockets_lock); 97 sk_for_each(s, node, &atalk_sockets) { 98 struct atalk_sock *at = at_sk(s); 99 100 if (to->sat_port != at->src_port) 101 continue; 102 103 if (to->sat_addr.s_net == ATADDR_ANYNET && 104 to->sat_addr.s_node == ATADDR_BCAST) 105 goto found; 106 107 if (to->sat_addr.s_net == at->src_net && 108 (to->sat_addr.s_node == at->src_node || 109 to->sat_addr.s_node == ATADDR_BCAST || 110 to->sat_addr.s_node == ATADDR_ANYNODE)) 111 goto found; 112 113 /* XXXX.0 -- we got a request for this router. make sure 114 * that the node is appropriately set. */ 115 if (to->sat_addr.s_node == ATADDR_ANYNODE && 116 to->sat_addr.s_net != ATADDR_ANYNET && 117 atif->address.s_node == at->src_node) { 118 to->sat_addr.s_node = atif->address.s_node; 119 goto found; 120 } 121 } 122 s = NULL; 123 found: 124 read_unlock_bh(&atalk_sockets_lock); 125 return s; 126 } 127 128 /** 129 * atalk_find_or_insert_socket - Try to find a socket matching ADDR 130 * @sk - socket to insert in the list if it is not there already 131 * @sat - address to search for 132 * 133 * Try to find a socket matching ADDR in the socket list, if found then return 134 * it. If not, insert SK into the socket list. 135 * 136 * This entire operation must execute atomically. 137 */ 138 static struct sock *atalk_find_or_insert_socket(struct sock *sk, 139 struct sockaddr_at *sat) 140 { 141 struct sock *s; 142 struct hlist_node *node; 143 struct atalk_sock *at; 144 145 write_lock_bh(&atalk_sockets_lock); 146 sk_for_each(s, node, &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 (atomic_read(&sk->sk_wmem_alloc) || 166 atomic_read(&sk->sk_rmem_alloc)) { 167 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; 168 add_timer(&sk->sk_timer); 169 } else 170 sock_put(sk); 171 } 172 173 static inline void atalk_destroy_socket(struct sock *sk) 174 { 175 atalk_remove_socket(sk); 176 skb_queue_purge(&sk->sk_receive_queue); 177 178 if (atomic_read(&sk->sk_wmem_alloc) || 179 atomic_read(&sk->sk_rmem_alloc)) { 180 init_timer(&sk->sk_timer); 181 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; 182 sk->sk_timer.function = atalk_destroy_timer; 183 sk->sk_timer.data = (unsigned long)sk; 184 add_timer(&sk->sk_timer); 185 } else 186 sock_put(sk); 187 } 188 189 /**************************************************************************\ 190 * * 191 * Routing tables for the AppleTalk socket layer. * 192 * * 193 \**************************************************************************/ 194 195 /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */ 196 struct atalk_route *atalk_routes; 197 DEFINE_RWLOCK(atalk_routes_lock); 198 199 struct atalk_iface *atalk_interfaces; 200 DEFINE_RWLOCK(atalk_interfaces_lock); 201 202 /* For probing devices or in a routerless network */ 203 struct atalk_route atrtr_default; 204 205 /* AppleTalk interface control */ 206 /* 207 * Drop a device. Doesn't drop any of its routes - that is the caller's 208 * problem. Called when we down the interface or delete the address. 209 */ 210 static void atif_drop_device(struct net_device *dev) 211 { 212 struct atalk_iface **iface = &atalk_interfaces; 213 struct atalk_iface *tmp; 214 215 write_lock_bh(&atalk_interfaces_lock); 216 while ((tmp = *iface) != NULL) { 217 if (tmp->dev == dev) { 218 *iface = tmp->next; 219 dev_put(dev); 220 kfree(tmp); 221 dev->atalk_ptr = NULL; 222 } else 223 iface = &tmp->next; 224 } 225 write_unlock_bh(&atalk_interfaces_lock); 226 } 227 228 static struct atalk_iface *atif_add_device(struct net_device *dev, 229 struct atalk_addr *sa) 230 { 231 struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL); 232 233 if (!iface) 234 goto out; 235 236 dev_hold(dev); 237 iface->dev = dev; 238 dev->atalk_ptr = iface; 239 iface->address = *sa; 240 iface->status = 0; 241 242 write_lock_bh(&atalk_interfaces_lock); 243 iface->next = atalk_interfaces; 244 atalk_interfaces = iface; 245 write_unlock_bh(&atalk_interfaces_lock); 246 out: 247 return iface; 248 } 249 250 /* Perform phase 2 AARP probing on our tentative address */ 251 static int atif_probe_device(struct atalk_iface *atif) 252 { 253 int netrange = ntohs(atif->nets.nr_lastnet) - 254 ntohs(atif->nets.nr_firstnet) + 1; 255 int probe_net = ntohs(atif->address.s_net); 256 int probe_node = atif->address.s_node; 257 int netct, nodect; 258 259 /* Offset the network we start probing with */ 260 if (probe_net == ATADDR_ANYNET) { 261 probe_net = ntohs(atif->nets.nr_firstnet); 262 if (netrange) 263 probe_net += jiffies % netrange; 264 } 265 if (probe_node == ATADDR_ANYNODE) 266 probe_node = jiffies & 0xFF; 267 268 /* Scan the networks */ 269 atif->status |= ATIF_PROBE; 270 for (netct = 0; netct <= netrange; netct++) { 271 /* Sweep the available nodes from a given start */ 272 atif->address.s_net = htons(probe_net); 273 for (nodect = 0; nodect < 256; nodect++) { 274 atif->address.s_node = (nodect + probe_node) & 0xFF; 275 if (atif->address.s_node > 0 && 276 atif->address.s_node < 254) { 277 /* Probe a proposed address */ 278 aarp_probe_network(atif); 279 280 if (!(atif->status & ATIF_PROBE_FAIL)) { 281 atif->status &= ~ATIF_PROBE; 282 return 0; 283 } 284 } 285 atif->status &= ~ATIF_PROBE_FAIL; 286 } 287 probe_net++; 288 if (probe_net > ntohs(atif->nets.nr_lastnet)) 289 probe_net = ntohs(atif->nets.nr_firstnet); 290 } 291 atif->status &= ~ATIF_PROBE; 292 293 return -EADDRINUSE; /* Network is full... */ 294 } 295 296 297 /* Perform AARP probing for a proxy address */ 298 static int atif_proxy_probe_device(struct atalk_iface *atif, 299 struct atalk_addr* proxy_addr) 300 { 301 int netrange = ntohs(atif->nets.nr_lastnet) - 302 ntohs(atif->nets.nr_firstnet) + 1; 303 /* we probe the interface's network */ 304 int probe_net = ntohs(atif->address.s_net); 305 int probe_node = ATADDR_ANYNODE; /* we'll take anything */ 306 int netct, nodect; 307 308 /* Offset the network we start probing with */ 309 if (probe_net == ATADDR_ANYNET) { 310 probe_net = ntohs(atif->nets.nr_firstnet); 311 if (netrange) 312 probe_net += jiffies % netrange; 313 } 314 315 if (probe_node == ATADDR_ANYNODE) 316 probe_node = jiffies & 0xFF; 317 318 /* Scan the networks */ 319 for (netct = 0; netct <= netrange; netct++) { 320 /* Sweep the available nodes from a given start */ 321 proxy_addr->s_net = htons(probe_net); 322 for (nodect = 0; nodect < 256; nodect++) { 323 proxy_addr->s_node = (nodect + probe_node) & 0xFF; 324 if (proxy_addr->s_node > 0 && 325 proxy_addr->s_node < 254) { 326 /* Tell AARP to probe a proposed address */ 327 int ret = aarp_proxy_probe_network(atif, 328 proxy_addr); 329 330 if (ret != -EADDRINUSE) 331 return ret; 332 } 333 } 334 probe_net++; 335 if (probe_net > ntohs(atif->nets.nr_lastnet)) 336 probe_net = ntohs(atif->nets.nr_firstnet); 337 } 338 339 return -EADDRINUSE; /* Network is full... */ 340 } 341 342 343 struct atalk_addr *atalk_find_dev_addr(struct net_device *dev) 344 { 345 struct atalk_iface *iface = dev->atalk_ptr; 346 return iface ? &iface->address : NULL; 347 } 348 349 static struct atalk_addr *atalk_find_primary(void) 350 { 351 struct atalk_iface *fiface = NULL; 352 struct atalk_addr *retval; 353 struct atalk_iface *iface; 354 355 /* 356 * Return a point-to-point interface only if 357 * there is no non-ptp interface available. 358 */ 359 read_lock_bh(&atalk_interfaces_lock); 360 for (iface = atalk_interfaces; iface; iface = iface->next) { 361 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK)) 362 fiface = iface; 363 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { 364 retval = &iface->address; 365 goto out; 366 } 367 } 368 369 if (fiface) 370 retval = &fiface->address; 371 else if (atalk_interfaces) 372 retval = &atalk_interfaces->address; 373 else 374 retval = NULL; 375 out: 376 read_unlock_bh(&atalk_interfaces_lock); 377 return retval; 378 } 379 380 /* 381 * Find a match for 'any network' - ie any of our interfaces with that 382 * node number will do just nicely. 383 */ 384 static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev) 385 { 386 struct atalk_iface *iface = dev->atalk_ptr; 387 388 if (!iface || iface->status & ATIF_PROBE) 389 goto out_err; 390 391 if (node != ATADDR_BCAST && 392 iface->address.s_node != node && 393 node != ATADDR_ANYNODE) 394 goto out_err; 395 out: 396 return iface; 397 out_err: 398 iface = NULL; 399 goto out; 400 } 401 402 /* Find a match for a specific network:node pair */ 403 static struct atalk_iface *atalk_find_interface(__be16 net, int node) 404 { 405 struct atalk_iface *iface; 406 407 read_lock_bh(&atalk_interfaces_lock); 408 for (iface = atalk_interfaces; iface; iface = iface->next) { 409 if ((node == ATADDR_BCAST || 410 node == ATADDR_ANYNODE || 411 iface->address.s_node == node) && 412 iface->address.s_net == net && 413 !(iface->status & ATIF_PROBE)) 414 break; 415 416 /* XXXX.0 -- net.0 returns the iface associated with net */ 417 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET && 418 ntohs(iface->nets.nr_firstnet) <= ntohs(net) && 419 ntohs(net) <= ntohs(iface->nets.nr_lastnet)) 420 break; 421 } 422 read_unlock_bh(&atalk_interfaces_lock); 423 return iface; 424 } 425 426 427 /* 428 * Find a route for an AppleTalk packet. This ought to get cached in 429 * the socket (later on...). We know about host routes and the fact 430 * that a route must be direct to broadcast. 431 */ 432 static struct atalk_route *atrtr_find(struct atalk_addr *target) 433 { 434 /* 435 * we must search through all routes unless we find a 436 * host route, because some host routes might overlap 437 * network routes 438 */ 439 struct atalk_route *net_route = NULL; 440 struct atalk_route *r; 441 442 read_lock_bh(&atalk_routes_lock); 443 for (r = atalk_routes; r; r = r->next) { 444 if (!(r->flags & RTF_UP)) 445 continue; 446 447 if (r->target.s_net == target->s_net) { 448 if (r->flags & RTF_HOST) { 449 /* 450 * if this host route is for the target, 451 * the we're done 452 */ 453 if (r->target.s_node == target->s_node) 454 goto out; 455 } else 456 /* 457 * this route will work if there isn't a 458 * direct host route, so cache it 459 */ 460 net_route = r; 461 } 462 } 463 464 /* 465 * if we found a network route but not a direct host 466 * route, then return it 467 */ 468 if (net_route) 469 r = net_route; 470 else if (atrtr_default.dev) 471 r = &atrtr_default; 472 else /* No route can be found */ 473 r = NULL; 474 out: 475 read_unlock_bh(&atalk_routes_lock); 476 return r; 477 } 478 479 480 /* 481 * Given an AppleTalk network, find the device to use. This can be 482 * a simple lookup. 483 */ 484 struct net_device *atrtr_get_dev(struct atalk_addr *sa) 485 { 486 struct atalk_route *atr = atrtr_find(sa); 487 return atr ? atr->dev : NULL; 488 } 489 490 /* Set up a default router */ 491 static void atrtr_set_default(struct net_device *dev) 492 { 493 atrtr_default.dev = dev; 494 atrtr_default.flags = RTF_UP; 495 atrtr_default.gateway.s_net = htons(0); 496 atrtr_default.gateway.s_node = 0; 497 } 498 499 /* 500 * Add a router. Basically make sure it looks valid and stuff the 501 * entry in the list. While it uses netranges we always set them to one 502 * entry to work like netatalk. 503 */ 504 static int atrtr_create(struct rtentry *r, struct net_device *devhint) 505 { 506 struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst; 507 struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway; 508 struct atalk_route *rt; 509 struct atalk_iface *iface, *riface; 510 int retval = -EINVAL; 511 512 /* 513 * Fixme: Raise/Lower a routing change semaphore for these 514 * operations. 515 */ 516 517 /* Validate the request */ 518 if (ta->sat_family != AF_APPLETALK || 519 (!devhint && ga->sat_family != AF_APPLETALK)) 520 goto out; 521 522 /* Now walk the routing table and make our decisions */ 523 write_lock_bh(&atalk_routes_lock); 524 for (rt = atalk_routes; rt; rt = rt->next) { 525 if (r->rt_flags != rt->flags) 526 continue; 527 528 if (ta->sat_addr.s_net == rt->target.s_net) { 529 if (!(rt->flags & RTF_HOST)) 530 break; 531 if (ta->sat_addr.s_node == rt->target.s_node) 532 break; 533 } 534 } 535 536 if (!devhint) { 537 riface = NULL; 538 539 read_lock_bh(&atalk_interfaces_lock); 540 for (iface = atalk_interfaces; iface; iface = iface->next) { 541 if (!riface && 542 ntohs(ga->sat_addr.s_net) >= 543 ntohs(iface->nets.nr_firstnet) && 544 ntohs(ga->sat_addr.s_net) <= 545 ntohs(iface->nets.nr_lastnet)) 546 riface = iface; 547 548 if (ga->sat_addr.s_net == iface->address.s_net && 549 ga->sat_addr.s_node == iface->address.s_node) 550 riface = iface; 551 } 552 read_unlock_bh(&atalk_interfaces_lock); 553 554 retval = -ENETUNREACH; 555 if (!riface) 556 goto out_unlock; 557 558 devhint = riface->dev; 559 } 560 561 if (!rt) { 562 rt = kzalloc(sizeof(*rt), GFP_ATOMIC); 563 564 retval = -ENOBUFS; 565 if (!rt) 566 goto out_unlock; 567 568 rt->next = atalk_routes; 569 atalk_routes = rt; 570 } 571 572 /* Fill in the routing entry */ 573 rt->target = ta->sat_addr; 574 dev_hold(devhint); 575 rt->dev = devhint; 576 rt->flags = r->rt_flags; 577 rt->gateway = ga->sat_addr; 578 579 retval = 0; 580 out_unlock: 581 write_unlock_bh(&atalk_routes_lock); 582 out: 583 return retval; 584 } 585 586 /* Delete a route. Find it and discard it */ 587 static int atrtr_delete(struct atalk_addr * addr) 588 { 589 struct atalk_route **r = &atalk_routes; 590 int retval = 0; 591 struct atalk_route *tmp; 592 593 write_lock_bh(&atalk_routes_lock); 594 while ((tmp = *r) != NULL) { 595 if (tmp->target.s_net == addr->s_net && 596 (!(tmp->flags&RTF_GATEWAY) || 597 tmp->target.s_node == addr->s_node)) { 598 *r = tmp->next; 599 dev_put(tmp->dev); 600 kfree(tmp); 601 goto out; 602 } 603 r = &tmp->next; 604 } 605 retval = -ENOENT; 606 out: 607 write_unlock_bh(&atalk_routes_lock); 608 return retval; 609 } 610 611 /* 612 * Called when a device is downed. Just throw away any routes 613 * via it. 614 */ 615 static void atrtr_device_down(struct net_device *dev) 616 { 617 struct atalk_route **r = &atalk_routes; 618 struct atalk_route *tmp; 619 620 write_lock_bh(&atalk_routes_lock); 621 while ((tmp = *r) != NULL) { 622 if (tmp->dev == dev) { 623 *r = tmp->next; 624 dev_put(dev); 625 kfree(tmp); 626 } else 627 r = &tmp->next; 628 } 629 write_unlock_bh(&atalk_routes_lock); 630 631 if (atrtr_default.dev == dev) 632 atrtr_set_default(NULL); 633 } 634 635 /* Actually down the interface */ 636 static inline void atalk_dev_down(struct net_device *dev) 637 { 638 atrtr_device_down(dev); /* Remove all routes for the device */ 639 aarp_device_down(dev); /* Remove AARP entries for the device */ 640 atif_drop_device(dev); /* Remove the device */ 641 } 642 643 /* 644 * A device event has occurred. Watch for devices going down and 645 * delete our use of them (iface and route). 646 */ 647 static int ddp_device_event(struct notifier_block *this, unsigned long event, 648 void *ptr) 649 { 650 if (event == NETDEV_DOWN) 651 /* Discard any use of this */ 652 atalk_dev_down(ptr); 653 654 return NOTIFY_DONE; 655 } 656 657 /* ioctl calls. Shouldn't even need touching */ 658 /* Device configuration ioctl calls */ 659 static int atif_ioctl(int cmd, void __user *arg) 660 { 661 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF }; 662 struct ifreq atreq; 663 struct atalk_netrange *nr; 664 struct sockaddr_at *sa; 665 struct net_device *dev; 666 struct atalk_iface *atif; 667 int ct; 668 int limit; 669 struct rtentry rtdef; 670 int add_route; 671 672 if (copy_from_user(&atreq, arg, sizeof(atreq))) 673 return -EFAULT; 674 675 dev = __dev_get_by_name(atreq.ifr_name); 676 if (!dev) 677 return -ENODEV; 678 679 sa = (struct sockaddr_at *)&atreq.ifr_addr; 680 atif = atalk_find_dev(dev); 681 682 switch (cmd) { 683 case SIOCSIFADDR: 684 if (!capable(CAP_NET_ADMIN)) 685 return -EPERM; 686 if (sa->sat_family != AF_APPLETALK) 687 return -EINVAL; 688 if (dev->type != ARPHRD_ETHER && 689 dev->type != ARPHRD_LOOPBACK && 690 dev->type != ARPHRD_LOCALTLK && 691 dev->type != ARPHRD_PPP) 692 return -EPROTONOSUPPORT; 693 694 nr = (struct atalk_netrange *)&sa->sat_zero[0]; 695 add_route = 1; 696 697 /* 698 * if this is a point-to-point iface, and we already 699 * have an iface for this AppleTalk address, then we 700 * should not add a route 701 */ 702 if ((dev->flags & IFF_POINTOPOINT) && 703 atalk_find_interface(sa->sat_addr.s_net, 704 sa->sat_addr.s_node)) { 705 printk(KERN_DEBUG "AppleTalk: point-to-point " 706 "interface added with " 707 "existing address\n"); 708 add_route = 0; 709 } 710 711 /* 712 * Phase 1 is fine on LocalTalk but we don't do 713 * EtherTalk phase 1. Anyone wanting to add it go ahead. 714 */ 715 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) 716 return -EPROTONOSUPPORT; 717 if (sa->sat_addr.s_node == ATADDR_BCAST || 718 sa->sat_addr.s_node == 254) 719 return -EINVAL; 720 if (atif) { 721 /* Already setting address */ 722 if (atif->status & ATIF_PROBE) 723 return -EBUSY; 724 725 atif->address.s_net = sa->sat_addr.s_net; 726 atif->address.s_node = sa->sat_addr.s_node; 727 atrtr_device_down(dev); /* Flush old routes */ 728 } else { 729 atif = atif_add_device(dev, &sa->sat_addr); 730 if (!atif) 731 return -ENOMEM; 732 } 733 atif->nets = *nr; 734 735 /* 736 * Check if the chosen address is used. If so we 737 * error and atalkd will try another. 738 */ 739 740 if (!(dev->flags & IFF_LOOPBACK) && 741 !(dev->flags & IFF_POINTOPOINT) && 742 atif_probe_device(atif) < 0) { 743 atif_drop_device(dev); 744 return -EADDRINUSE; 745 } 746 747 /* Hey it worked - add the direct routes */ 748 sa = (struct sockaddr_at *)&rtdef.rt_gateway; 749 sa->sat_family = AF_APPLETALK; 750 sa->sat_addr.s_net = atif->address.s_net; 751 sa->sat_addr.s_node = atif->address.s_node; 752 sa = (struct sockaddr_at *)&rtdef.rt_dst; 753 rtdef.rt_flags = RTF_UP; 754 sa->sat_family = AF_APPLETALK; 755 sa->sat_addr.s_node = ATADDR_ANYNODE; 756 if (dev->flags & IFF_LOOPBACK || 757 dev->flags & IFF_POINTOPOINT) 758 rtdef.rt_flags |= RTF_HOST; 759 760 /* Routerless initial state */ 761 if (nr->nr_firstnet == htons(0) && 762 nr->nr_lastnet == htons(0xFFFE)) { 763 sa->sat_addr.s_net = atif->address.s_net; 764 atrtr_create(&rtdef, dev); 765 atrtr_set_default(dev); 766 } else { 767 limit = ntohs(nr->nr_lastnet); 768 if (limit - ntohs(nr->nr_firstnet) > 4096) { 769 printk(KERN_WARNING "Too many routes/" 770 "iface.\n"); 771 return -EINVAL; 772 } 773 if (add_route) 774 for (ct = ntohs(nr->nr_firstnet); 775 ct <= limit; ct++) { 776 sa->sat_addr.s_net = htons(ct); 777 atrtr_create(&rtdef, dev); 778 } 779 } 780 dev_mc_add(dev, aarp_mcast, 6, 1); 781 return 0; 782 783 case SIOCGIFADDR: 784 if (!atif) 785 return -EADDRNOTAVAIL; 786 787 sa->sat_family = AF_APPLETALK; 788 sa->sat_addr = atif->address; 789 break; 790 791 case SIOCGIFBRDADDR: 792 if (!atif) 793 return -EADDRNOTAVAIL; 794 795 sa->sat_family = AF_APPLETALK; 796 sa->sat_addr.s_net = atif->address.s_net; 797 sa->sat_addr.s_node = ATADDR_BCAST; 798 break; 799 800 case SIOCATALKDIFADDR: 801 case SIOCDIFADDR: 802 if (!capable(CAP_NET_ADMIN)) 803 return -EPERM; 804 if (sa->sat_family != AF_APPLETALK) 805 return -EINVAL; 806 atalk_dev_down(dev); 807 break; 808 809 case SIOCSARP: 810 if (!capable(CAP_NET_ADMIN)) 811 return -EPERM; 812 if (sa->sat_family != AF_APPLETALK) 813 return -EINVAL; 814 if (!atif) 815 return -EADDRNOTAVAIL; 816 817 /* 818 * for now, we only support proxy AARP on ELAP; 819 * we should be able to do it for LocalTalk, too. 820 */ 821 if (dev->type != ARPHRD_ETHER) 822 return -EPROTONOSUPPORT; 823 824 /* 825 * atif points to the current interface on this network; 826 * we aren't concerned about its current status (at 827 * least for now), but it has all the settings about 828 * the network we're going to probe. Consequently, it 829 * must exist. 830 */ 831 if (!atif) 832 return -EADDRNOTAVAIL; 833 834 nr = (struct atalk_netrange *)&(atif->nets); 835 /* 836 * Phase 1 is fine on Localtalk but we don't do 837 * Ethertalk phase 1. Anyone wanting to add it go ahead. 838 */ 839 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) 840 return -EPROTONOSUPPORT; 841 842 if (sa->sat_addr.s_node == ATADDR_BCAST || 843 sa->sat_addr.s_node == 254) 844 return -EINVAL; 845 846 /* 847 * Check if the chosen address is used. If so we 848 * error and ATCP will try another. 849 */ 850 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0) 851 return -EADDRINUSE; 852 853 /* 854 * We now have an address on the local network, and 855 * the AARP code will defend it for us until we take it 856 * down. We don't set up any routes right now, because 857 * ATCP will install them manually via SIOCADDRT. 858 */ 859 break; 860 861 case SIOCDARP: 862 if (!capable(CAP_NET_ADMIN)) 863 return -EPERM; 864 if (sa->sat_family != AF_APPLETALK) 865 return -EINVAL; 866 if (!atif) 867 return -EADDRNOTAVAIL; 868 869 /* give to aarp module to remove proxy entry */ 870 aarp_proxy_remove(atif->dev, &(sa->sat_addr)); 871 return 0; 872 } 873 874 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0; 875 } 876 877 /* Routing ioctl() calls */ 878 static int atrtr_ioctl(unsigned int cmd, void __user *arg) 879 { 880 struct rtentry rt; 881 882 if (copy_from_user(&rt, arg, sizeof(rt))) 883 return -EFAULT; 884 885 switch (cmd) { 886 case SIOCDELRT: 887 if (rt.rt_dst.sa_family != AF_APPLETALK) 888 return -EINVAL; 889 return atrtr_delete(&((struct sockaddr_at *) 890 &rt.rt_dst)->sat_addr); 891 892 case SIOCADDRT: { 893 struct net_device *dev = NULL; 894 if (rt.rt_dev) { 895 char name[IFNAMSIZ]; 896 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1)) 897 return -EFAULT; 898 name[IFNAMSIZ-1] = '\0'; 899 dev = __dev_get_by_name(name); 900 if (!dev) 901 return -ENODEV; 902 } 903 return atrtr_create(&rt, dev); 904 } 905 } 906 return -EINVAL; 907 } 908 909 /**************************************************************************\ 910 * * 911 * Handling for system calls applied via the various interfaces to an * 912 * AppleTalk socket object. * 913 * * 914 \**************************************************************************/ 915 916 /* 917 * Checksum: This is 'optional'. It's quite likely also a good 918 * candidate for assembler hackery 8) 919 */ 920 static unsigned long atalk_sum_partial(const unsigned char *data, 921 int len, unsigned long sum) 922 { 923 /* This ought to be unwrapped neatly. I'll trust gcc for now */ 924 while (len--) { 925 sum += *data; 926 sum <<= 1; 927 if (sum & 0x10000) { 928 sum++; 929 sum &= 0xffff; 930 } 931 data++; 932 } 933 return sum; 934 } 935 936 /* Checksum skb data -- similar to skb_checksum */ 937 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset, 938 int len, unsigned long sum) 939 { 940 int start = skb_headlen(skb); 941 int i, copy; 942 943 /* checksum stuff in header space */ 944 if ( (copy = start - offset) > 0) { 945 if (copy > len) 946 copy = len; 947 sum = atalk_sum_partial(skb->data + offset, copy, sum); 948 if ( (len -= copy) == 0) 949 return sum; 950 951 offset += copy; 952 } 953 954 /* checksum stuff in frags */ 955 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 956 int end; 957 958 BUG_TRAP(start <= offset + len); 959 960 end = start + skb_shinfo(skb)->frags[i].size; 961 if ((copy = end - offset) > 0) { 962 u8 *vaddr; 963 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 964 965 if (copy > len) 966 copy = len; 967 vaddr = kmap_skb_frag(frag); 968 sum = atalk_sum_partial(vaddr + frag->page_offset + 969 offset - start, copy, sum); 970 kunmap_skb_frag(vaddr); 971 972 if (!(len -= copy)) 973 return sum; 974 offset += copy; 975 } 976 start = end; 977 } 978 979 if (skb_shinfo(skb)->frag_list) { 980 struct sk_buff *list = skb_shinfo(skb)->frag_list; 981 982 for (; list; list = list->next) { 983 int end; 984 985 BUG_TRAP(start <= offset + len); 986 987 end = start + list->len; 988 if ((copy = end - offset) > 0) { 989 if (copy > len) 990 copy = len; 991 sum = atalk_sum_skb(list, offset - start, 992 copy, sum); 993 if ((len -= copy) == 0) 994 return sum; 995 offset += copy; 996 } 997 start = end; 998 } 999 } 1000 1001 BUG_ON(len > 0); 1002 1003 return sum; 1004 } 1005 1006 static __be16 atalk_checksum(const struct sk_buff *skb, int len) 1007 { 1008 unsigned long sum; 1009 1010 /* skip header 4 bytes */ 1011 sum = atalk_sum_skb(skb, 4, len-4, 0); 1012 1013 /* Use 0xFFFF for 0. 0 itself means none */ 1014 return sum ? htons((unsigned short)sum) : htons(0xFFFF); 1015 } 1016 1017 static struct proto ddp_proto = { 1018 .name = "DDP", 1019 .owner = THIS_MODULE, 1020 .obj_size = sizeof(struct atalk_sock), 1021 }; 1022 1023 /* 1024 * Create a socket. Initialise the socket, blank the addresses 1025 * set the state. 1026 */ 1027 static int atalk_create(struct socket *sock, int protocol) 1028 { 1029 struct sock *sk; 1030 int rc = -ESOCKTNOSUPPORT; 1031 1032 /* 1033 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do 1034 * and gives you the full ELAP frame. Should be handy for CAP 8) 1035 */ 1036 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 1037 goto out; 1038 rc = -ENOMEM; 1039 sk = sk_alloc(PF_APPLETALK, GFP_KERNEL, &ddp_proto, 1); 1040 if (!sk) 1041 goto out; 1042 rc = 0; 1043 sock->ops = &atalk_dgram_ops; 1044 sock_init_data(sock, sk); 1045 1046 /* Checksums on by default */ 1047 sock_set_flag(sk, SOCK_ZAPPED); 1048 out: 1049 return rc; 1050 } 1051 1052 /* Free a socket. No work needed */ 1053 static int atalk_release(struct socket *sock) 1054 { 1055 struct sock *sk = sock->sk; 1056 1057 if (sk) { 1058 sock_orphan(sk); 1059 sock->sk = NULL; 1060 atalk_destroy_socket(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 struct hlist_node *node; 1086 1087 sk_for_each(s, node, &atalk_sockets) { 1088 struct atalk_sock *at = at_sk(s); 1089 1090 if (at->src_net == sat->sat_addr.s_net && 1091 at->src_node == sat->sat_addr.s_node && 1092 at->src_port == sat->sat_port) 1093 goto try_next_port; 1094 } 1095 1096 /* Wheee, it's free, assign and insert. */ 1097 __atalk_insert_socket(sk); 1098 at_sk(sk)->src_port = sat->sat_port; 1099 retval = 0; 1100 goto out; 1101 1102 try_next_port:; 1103 } 1104 1105 retval = -EBUSY; 1106 out: 1107 write_unlock_bh(&atalk_sockets_lock); 1108 return retval; 1109 } 1110 1111 static int atalk_autobind(struct sock *sk) 1112 { 1113 struct atalk_sock *at = at_sk(sk); 1114 struct sockaddr_at sat; 1115 struct atalk_addr *ap = atalk_find_primary(); 1116 int n = -EADDRNOTAVAIL; 1117 1118 if (!ap || ap->s_net == htons(ATADDR_ANYNET)) 1119 goto out; 1120 1121 at->src_net = sat.sat_addr.s_net = ap->s_net; 1122 at->src_node = sat.sat_addr.s_node = ap->s_node; 1123 1124 n = atalk_pick_and_bind_port(sk, &sat); 1125 if (!n) 1126 sock_reset_flag(sk, SOCK_ZAPPED); 1127 out: 1128 return n; 1129 } 1130 1131 /* Set the address 'our end' of the connection */ 1132 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 1133 { 1134 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr; 1135 struct sock *sk = sock->sk; 1136 struct atalk_sock *at = at_sk(sk); 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 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) { 1146 struct atalk_addr *ap = atalk_find_primary(); 1147 1148 if (!ap) 1149 return -EADDRNOTAVAIL; 1150 1151 at->src_net = addr->sat_addr.s_net = ap->s_net; 1152 at->src_node = addr->sat_addr.s_node= ap->s_node; 1153 } else { 1154 if (!atalk_find_interface(addr->sat_addr.s_net, 1155 addr->sat_addr.s_node)) 1156 return -EADDRNOTAVAIL; 1157 1158 at->src_net = addr->sat_addr.s_net; 1159 at->src_node = addr->sat_addr.s_node; 1160 } 1161 1162 if (addr->sat_port == ATADDR_ANYPORT) { 1163 int n = atalk_pick_and_bind_port(sk, addr); 1164 1165 if (n < 0) 1166 return n; 1167 } else { 1168 at->src_port = addr->sat_port; 1169 1170 if (atalk_find_or_insert_socket(sk, addr)) 1171 return -EADDRINUSE; 1172 } 1173 1174 sock_reset_flag(sk, SOCK_ZAPPED); 1175 return 0; 1176 } 1177 1178 /* Set the address we talk to */ 1179 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr, 1180 int addr_len, int flags) 1181 { 1182 struct sock *sk = sock->sk; 1183 struct atalk_sock *at = at_sk(sk); 1184 struct sockaddr_at *addr; 1185 1186 sk->sk_state = TCP_CLOSE; 1187 sock->state = SS_UNCONNECTED; 1188 1189 if (addr_len != sizeof(*addr)) 1190 return -EINVAL; 1191 1192 addr = (struct sockaddr_at *)uaddr; 1193 1194 if (addr->sat_family != AF_APPLETALK) 1195 return -EAFNOSUPPORT; 1196 1197 if (addr->sat_addr.s_node == ATADDR_BCAST && 1198 !sock_flag(sk, SOCK_BROADCAST)) { 1199 #if 1 1200 printk(KERN_WARNING "%s is broken and did not set " 1201 "SO_BROADCAST. It will break when 2.2 is " 1202 "released.\n", 1203 current->comm); 1204 #else 1205 return -EACCES; 1206 #endif 1207 } 1208 1209 if (sock_flag(sk, SOCK_ZAPPED)) 1210 if (atalk_autobind(sk) < 0) 1211 return -EBUSY; 1212 1213 if (!atrtr_get_dev(&addr->sat_addr)) 1214 return -ENETUNREACH; 1215 1216 at->dest_port = addr->sat_port; 1217 at->dest_net = addr->sat_addr.s_net; 1218 at->dest_node = addr->sat_addr.s_node; 1219 1220 sock->state = SS_CONNECTED; 1221 sk->sk_state = TCP_ESTABLISHED; 1222 return 0; 1223 } 1224 1225 /* 1226 * Find the name of an AppleTalk socket. Just copy the right 1227 * fields into the sockaddr. 1228 */ 1229 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr, 1230 int *uaddr_len, int peer) 1231 { 1232 struct sockaddr_at sat; 1233 struct sock *sk = sock->sk; 1234 struct atalk_sock *at = at_sk(sk); 1235 1236 if (sock_flag(sk, SOCK_ZAPPED)) 1237 if (atalk_autobind(sk) < 0) 1238 return -ENOBUFS; 1239 1240 *uaddr_len = sizeof(struct sockaddr_at); 1241 1242 if (peer) { 1243 if (sk->sk_state != TCP_ESTABLISHED) 1244 return -ENOTCONN; 1245 1246 sat.sat_addr.s_net = at->dest_net; 1247 sat.sat_addr.s_node = at->dest_node; 1248 sat.sat_port = at->dest_port; 1249 } else { 1250 sat.sat_addr.s_net = at->src_net; 1251 sat.sat_addr.s_node = at->src_node; 1252 sat.sat_port = at->src_port; 1253 } 1254 1255 sat.sat_family = AF_APPLETALK; 1256 memcpy(uaddr, &sat, sizeof(sat)); 1257 return 0; 1258 } 1259 1260 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE) 1261 static __inline__ int is_ip_over_ddp(struct sk_buff *skb) 1262 { 1263 return skb->data[12] == 22; 1264 } 1265 1266 static int handle_ip_over_ddp(struct sk_buff *skb) 1267 { 1268 struct net_device *dev = __dev_get_by_name("ipddp0"); 1269 struct net_device_stats *stats; 1270 1271 /* This needs to be able to handle ipddp"N" devices */ 1272 if (!dev) 1273 return -ENODEV; 1274 1275 skb->protocol = htons(ETH_P_IP); 1276 skb_pull(skb, 13); 1277 skb->dev = dev; 1278 skb_reset_transport_header(skb); 1279 1280 stats = dev->priv; 1281 stats->rx_packets++; 1282 stats->rx_bytes += skb->len + 13; 1283 netif_rx(skb); /* Send the SKB up to a higher place. */ 1284 return 0; 1285 } 1286 #else 1287 /* make it easy for gcc to optimize this test out, i.e. kill the code */ 1288 #define is_ip_over_ddp(skb) 0 1289 #define handle_ip_over_ddp(skb) 0 1290 #endif 1291 1292 static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev, 1293 struct ddpehdr *ddp, __u16 len_hops, 1294 int origlen) 1295 { 1296 struct atalk_route *rt; 1297 struct atalk_addr ta; 1298 1299 /* 1300 * Don't route multicast, etc., packets, or packets sent to "this 1301 * network" 1302 */ 1303 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) { 1304 /* 1305 * FIXME: 1306 * 1307 * Can it ever happen that a packet is from a PPP iface and 1308 * needs to be broadcast onto the default network? 1309 */ 1310 if (dev->type == ARPHRD_PPP) 1311 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast " 1312 "packet received from PPP iface\n"); 1313 goto free_it; 1314 } 1315 1316 ta.s_net = ddp->deh_dnet; 1317 ta.s_node = ddp->deh_dnode; 1318 1319 /* Route the packet */ 1320 rt = atrtr_find(&ta); 1321 /* increment hops count */ 1322 len_hops += 1 << 10; 1323 if (!rt || !(len_hops & (15 << 10))) 1324 goto free_it; 1325 1326 /* FIXME: use skb->cb to be able to use shared skbs */ 1327 1328 /* 1329 * Route goes through another gateway, so set the target to the 1330 * gateway instead. 1331 */ 1332 1333 if (rt->flags & RTF_GATEWAY) { 1334 ta.s_net = rt->gateway.s_net; 1335 ta.s_node = rt->gateway.s_node; 1336 } 1337 1338 /* Fix up skb->len field */ 1339 skb_trim(skb, min_t(unsigned int, origlen, 1340 (rt->dev->hard_header_len + 1341 ddp_dl->header_length + (len_hops & 1023)))); 1342 1343 /* FIXME: use skb->cb to be able to use shared skbs */ 1344 ddp->deh_len_hops = htons(len_hops); 1345 1346 /* 1347 * Send the buffer onwards 1348 * 1349 * Now we must always be careful. If it's come from LocalTalk to 1350 * EtherTalk it might not fit 1351 * 1352 * Order matters here: If a packet has to be copied to make a new 1353 * headroom (rare hopefully) then it won't need unsharing. 1354 * 1355 * Note. ddp-> becomes invalid at the realloc. 1356 */ 1357 if (skb_headroom(skb) < 22) { 1358 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */ 1359 struct sk_buff *nskb = skb_realloc_headroom(skb, 32); 1360 kfree_skb(skb); 1361 if (!nskb) 1362 goto out; 1363 skb = nskb; 1364 } else 1365 skb = skb_unshare(skb, GFP_ATOMIC); 1366 1367 /* 1368 * If the buffer didn't vanish into the lack of space bitbucket we can 1369 * send it. 1370 */ 1371 if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1) 1372 goto free_it; 1373 out: 1374 return; 1375 free_it: 1376 kfree_skb(skb); 1377 } 1378 1379 /** 1380 * atalk_rcv - Receive a packet (in skb) from device dev 1381 * @skb - packet received 1382 * @dev - network device where the packet comes from 1383 * @pt - packet type 1384 * 1385 * Receive a packet (in skb) from device dev. This has come from the SNAP 1386 * decoder, and on entry skb->transport_header is the DDP header, skb->len 1387 * is the DDP header, skb->len is the DDP length. The physical headers 1388 * have been extracted. PPP should probably pass frames marked as for this 1389 * layer. [ie ARPHRD_ETHERTALK] 1390 */ 1391 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev, 1392 struct packet_type *pt, struct net_device *orig_dev) 1393 { 1394 struct ddpehdr *ddp; 1395 struct sock *sock; 1396 struct atalk_iface *atif; 1397 struct sockaddr_at tosat; 1398 int origlen; 1399 __u16 len_hops; 1400 1401 /* Don't mangle buffer if shared */ 1402 if (!(skb = skb_share_check(skb, GFP_ATOMIC))) 1403 goto out; 1404 1405 /* Size check and make sure header is contiguous */ 1406 if (!pskb_may_pull(skb, sizeof(*ddp))) 1407 goto freeit; 1408 1409 ddp = ddp_hdr(skb); 1410 1411 len_hops = ntohs(ddp->deh_len_hops); 1412 1413 /* Trim buffer in case of stray trailing data */ 1414 origlen = skb->len; 1415 skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023)); 1416 1417 /* 1418 * Size check to see if ddp->deh_len was crap 1419 * (Otherwise we'll detonate most spectacularly 1420 * in the middle of atalk_checksum() or recvmsg()). 1421 */ 1422 if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) { 1423 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, " 1424 "skb->len=%u)\n", len_hops & 1023, skb->len); 1425 goto freeit; 1426 } 1427 1428 /* 1429 * Any checksums. Note we don't do htons() on this == is assumed to be 1430 * valid for net byte orders all over the networking code... 1431 */ 1432 if (ddp->deh_sum && 1433 atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum) 1434 /* Not a valid AppleTalk frame - dustbin time */ 1435 goto freeit; 1436 1437 /* Check the packet is aimed at us */ 1438 if (!ddp->deh_dnet) /* Net 0 is 'this network' */ 1439 atif = atalk_find_anynet(ddp->deh_dnode, dev); 1440 else 1441 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode); 1442 1443 if (!atif) { 1444 /* Not ours, so we route the packet via the correct 1445 * AppleTalk iface 1446 */ 1447 atalk_route_packet(skb, dev, ddp, len_hops, origlen); 1448 goto out; 1449 } 1450 1451 /* if IP over DDP is not selected this code will be optimized out */ 1452 if (is_ip_over_ddp(skb)) 1453 return handle_ip_over_ddp(skb); 1454 /* 1455 * Which socket - atalk_search_socket() looks for a *full match* 1456 * of the <net, node, port> tuple. 1457 */ 1458 tosat.sat_addr.s_net = ddp->deh_dnet; 1459 tosat.sat_addr.s_node = ddp->deh_dnode; 1460 tosat.sat_port = ddp->deh_dport; 1461 1462 sock = atalk_search_socket(&tosat, atif); 1463 if (!sock) /* But not one of our sockets */ 1464 goto freeit; 1465 1466 /* Queue packet (standard) */ 1467 skb->sk = sock; 1468 1469 if (sock_queue_rcv_skb(sock, skb) < 0) 1470 goto freeit; 1471 out: 1472 return 0; 1473 freeit: 1474 kfree_skb(skb); 1475 goto out; 1476 } 1477 1478 /* 1479 * Receive a LocalTalk frame. We make some demands on the caller here. 1480 * Caller must provide enough headroom on the packet to pull the short 1481 * header and append a long one. 1482 */ 1483 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev, 1484 struct packet_type *pt, struct net_device *orig_dev) 1485 { 1486 /* Expand any short form frames */ 1487 if (skb_mac_header(skb)[2] == 1) { 1488 struct ddpehdr *ddp; 1489 /* Find our address */ 1490 struct atalk_addr *ap = atalk_find_dev_addr(dev); 1491 1492 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023) 1493 goto freeit; 1494 1495 /* Don't mangle buffer if shared */ 1496 if (!(skb = skb_share_check(skb, GFP_ATOMIC))) 1497 return 0; 1498 1499 /* 1500 * The push leaves us with a ddephdr not an shdr, and 1501 * handily the port bytes in the right place preset. 1502 */ 1503 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4); 1504 1505 /* Now fill in the long header */ 1506 1507 /* 1508 * These two first. The mac overlays the new source/dest 1509 * network information so we MUST copy these before 1510 * we write the network numbers ! 1511 */ 1512 1513 ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */ 1514 ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */ 1515 1516 ddp->deh_dnet = ap->s_net; /* Network number */ 1517 ddp->deh_snet = ap->s_net; 1518 ddp->deh_sum = 0; /* No checksum */ 1519 /* 1520 * Not sure about this bit... 1521 */ 1522 /* Non routable, so force a drop if we slip up later */ 1523 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10)); 1524 } 1525 skb_reset_transport_header(skb); 1526 1527 return atalk_rcv(skb, dev, pt, orig_dev); 1528 freeit: 1529 kfree_skb(skb); 1530 return 0; 1531 } 1532 1533 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 1534 size_t len) 1535 { 1536 struct sock *sk = sock->sk; 1537 struct atalk_sock *at = at_sk(sk); 1538 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name; 1539 int flags = msg->msg_flags; 1540 int loopback = 0; 1541 struct sockaddr_at local_satalk, gsat; 1542 struct sk_buff *skb; 1543 struct net_device *dev; 1544 struct ddpehdr *ddp; 1545 int size; 1546 struct atalk_route *rt; 1547 int err; 1548 1549 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) 1550 return -EINVAL; 1551 1552 if (len > DDP_MAXSZ) 1553 return -EMSGSIZE; 1554 1555 if (usat) { 1556 if (sock_flag(sk, SOCK_ZAPPED)) 1557 if (atalk_autobind(sk) < 0) 1558 return -EBUSY; 1559 1560 if (msg->msg_namelen < sizeof(*usat) || 1561 usat->sat_family != AF_APPLETALK) 1562 return -EINVAL; 1563 1564 /* netatalk doesn't implement this check */ 1565 if (usat->sat_addr.s_node == ATADDR_BCAST && 1566 !sock_flag(sk, SOCK_BROADCAST)) { 1567 printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as " 1568 "it will break before 2.2\n"); 1569 #if 0 1570 return -EPERM; 1571 #endif 1572 } 1573 } else { 1574 if (sk->sk_state != TCP_ESTABLISHED) 1575 return -ENOTCONN; 1576 usat = &local_satalk; 1577 usat->sat_family = AF_APPLETALK; 1578 usat->sat_port = at->dest_port; 1579 usat->sat_addr.s_node = at->dest_node; 1580 usat->sat_addr.s_net = at->dest_net; 1581 } 1582 1583 /* Build a packet */ 1584 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk); 1585 1586 /* For headers */ 1587 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length; 1588 1589 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) { 1590 rt = atrtr_find(&usat->sat_addr); 1591 } else { 1592 struct atalk_addr at_hint; 1593 1594 at_hint.s_node = 0; 1595 at_hint.s_net = at->src_net; 1596 1597 rt = atrtr_find(&at_hint); 1598 } 1599 if (!rt) 1600 return -ENETUNREACH; 1601 1602 dev = rt->dev; 1603 1604 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n", 1605 sk, size, dev->name); 1606 1607 size += dev->hard_header_len; 1608 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err); 1609 if (!skb) 1610 return err; 1611 1612 skb->sk = sk; 1613 skb_reserve(skb, ddp_dl->header_length); 1614 skb_reserve(skb, dev->hard_header_len); 1615 skb->dev = dev; 1616 1617 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk); 1618 1619 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr)); 1620 ddp->deh_len_hops = htons(len + sizeof(*ddp)); 1621 ddp->deh_dnet = usat->sat_addr.s_net; 1622 ddp->deh_snet = at->src_net; 1623 ddp->deh_dnode = usat->sat_addr.s_node; 1624 ddp->deh_snode = at->src_node; 1625 ddp->deh_dport = usat->sat_port; 1626 ddp->deh_sport = at->src_port; 1627 1628 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len); 1629 1630 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); 1631 if (err) { 1632 kfree_skb(skb); 1633 return -EFAULT; 1634 } 1635 1636 if (sk->sk_no_check == 1) 1637 ddp->deh_sum = 0; 1638 else 1639 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp)); 1640 1641 /* 1642 * Loopback broadcast packets to non gateway targets (ie routes 1643 * to group we are in) 1644 */ 1645 if (ddp->deh_dnode == ATADDR_BCAST && 1646 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) { 1647 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL); 1648 1649 if (skb2) { 1650 loopback = 1; 1651 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk); 1652 if (aarp_send_ddp(dev, skb2, 1653 &usat->sat_addr, NULL) == -1) 1654 kfree_skb(skb2); 1655 /* else queued/sent above in the aarp queue */ 1656 } 1657 } 1658 1659 if (dev->flags & IFF_LOOPBACK || loopback) { 1660 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk); 1661 /* loop back */ 1662 skb_orphan(skb); 1663 if (ddp->deh_dnode == ATADDR_BCAST) { 1664 struct atalk_addr at_lo; 1665 1666 at_lo.s_node = 0; 1667 at_lo.s_net = 0; 1668 1669 rt = atrtr_find(&at_lo); 1670 if (!rt) { 1671 kfree_skb(skb); 1672 return -ENETUNREACH; 1673 } 1674 dev = rt->dev; 1675 skb->dev = dev; 1676 } 1677 ddp_dl->request(ddp_dl, skb, dev->dev_addr); 1678 } else { 1679 SOCK_DEBUG(sk, "SK %p: send out.\n", sk); 1680 if (rt->flags & RTF_GATEWAY) { 1681 gsat.sat_addr = rt->gateway; 1682 usat = &gsat; 1683 } 1684 1685 if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1) 1686 kfree_skb(skb); 1687 /* else queued/sent above in the aarp queue */ 1688 } 1689 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len); 1690 1691 return len; 1692 } 1693 1694 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 1695 size_t size, int flags) 1696 { 1697 struct sock *sk = sock->sk; 1698 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name; 1699 struct ddpehdr *ddp; 1700 int copied = 0; 1701 int offset = 0; 1702 int err = 0; 1703 struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1704 flags & MSG_DONTWAIT, &err); 1705 if (!skb) 1706 return err; 1707 1708 /* FIXME: use skb->cb to be able to use shared skbs */ 1709 ddp = ddp_hdr(skb); 1710 copied = ntohs(ddp->deh_len_hops) & 1023; 1711 1712 if (sk->sk_type != SOCK_RAW) { 1713 offset = sizeof(*ddp); 1714 copied -= offset; 1715 } 1716 1717 if (copied > size) { 1718 copied = size; 1719 msg->msg_flags |= MSG_TRUNC; 1720 } 1721 err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied); 1722 1723 if (!err) { 1724 if (sat) { 1725 sat->sat_family = AF_APPLETALK; 1726 sat->sat_port = ddp->deh_sport; 1727 sat->sat_addr.s_node = ddp->deh_snode; 1728 sat->sat_addr.s_net = ddp->deh_snet; 1729 } 1730 msg->msg_namelen = sizeof(*sat); 1731 } 1732 1733 skb_free_datagram(sk, skb); /* Free the datagram. */ 1734 return err ? : copied; 1735 } 1736 1737 1738 /* 1739 * AppleTalk ioctl calls. 1740 */ 1741 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1742 { 1743 int rc = -ENOIOCTLCMD; 1744 struct sock *sk = sock->sk; 1745 void __user *argp = (void __user *)arg; 1746 1747 switch (cmd) { 1748 /* Protocol layer */ 1749 case TIOCOUTQ: { 1750 long amount = sk->sk_sndbuf - 1751 atomic_read(&sk->sk_wmem_alloc); 1752 1753 if (amount < 0) 1754 amount = 0; 1755 rc = put_user(amount, (int __user *)argp); 1756 break; 1757 } 1758 case TIOCINQ: { 1759 /* 1760 * These two are safe on a single CPU system as only 1761 * user tasks fiddle here 1762 */ 1763 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); 1764 long amount = 0; 1765 1766 if (skb) 1767 amount = skb->len - sizeof(struct ddpehdr); 1768 rc = put_user(amount, (int __user *)argp); 1769 break; 1770 } 1771 case SIOCGSTAMP: 1772 rc = sock_get_timestamp(sk, argp); 1773 break; 1774 case SIOCGSTAMPNS: 1775 rc = sock_get_timestampns(sk, argp); 1776 break; 1777 /* Routing */ 1778 case SIOCADDRT: 1779 case SIOCDELRT: 1780 rc = -EPERM; 1781 if (capable(CAP_NET_ADMIN)) 1782 rc = atrtr_ioctl(cmd, argp); 1783 break; 1784 /* Interface */ 1785 case SIOCGIFADDR: 1786 case SIOCSIFADDR: 1787 case SIOCGIFBRDADDR: 1788 case SIOCATALKDIFADDR: 1789 case SIOCDIFADDR: 1790 case SIOCSARP: /* proxy AARP */ 1791 case SIOCDARP: /* proxy AARP */ 1792 rtnl_lock(); 1793 rc = atif_ioctl(cmd, argp); 1794 rtnl_unlock(); 1795 break; 1796 } 1797 1798 return rc; 1799 } 1800 1801 1802 #ifdef CONFIG_COMPAT 1803 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1804 { 1805 /* 1806 * All Appletalk ioctls except SIOCATALKDIFADDR are standard. And 1807 * SIOCATALKDIFADDR is handled by upper layer as well, so there is 1808 * nothing to do. Eventually SIOCATALKDIFADDR should be moved 1809 * here so there is no generic SIOCPROTOPRIVATE translation in the 1810 * system. 1811 */ 1812 return -ENOIOCTLCMD; 1813 } 1814 #endif 1815 1816 1817 static struct net_proto_family atalk_family_ops = { 1818 .family = PF_APPLETALK, 1819 .create = atalk_create, 1820 .owner = THIS_MODULE, 1821 }; 1822 1823 static const struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = { 1824 .family = PF_APPLETALK, 1825 .owner = THIS_MODULE, 1826 .release = atalk_release, 1827 .bind = atalk_bind, 1828 .connect = atalk_connect, 1829 .socketpair = sock_no_socketpair, 1830 .accept = sock_no_accept, 1831 .getname = atalk_getname, 1832 .poll = datagram_poll, 1833 .ioctl = atalk_ioctl, 1834 #ifdef CONFIG_COMPAT 1835 .compat_ioctl = atalk_compat_ioctl, 1836 #endif 1837 .listen = sock_no_listen, 1838 .shutdown = sock_no_shutdown, 1839 .setsockopt = sock_no_setsockopt, 1840 .getsockopt = sock_no_getsockopt, 1841 .sendmsg = atalk_sendmsg, 1842 .recvmsg = atalk_recvmsg, 1843 .mmap = sock_no_mmap, 1844 .sendpage = sock_no_sendpage, 1845 }; 1846 1847 SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK); 1848 1849 static struct notifier_block ddp_notifier = { 1850 .notifier_call = ddp_device_event, 1851 }; 1852 1853 static struct packet_type ltalk_packet_type = { 1854 .type = __constant_htons(ETH_P_LOCALTALK), 1855 .func = ltalk_rcv, 1856 }; 1857 1858 static struct packet_type ppptalk_packet_type = { 1859 .type = __constant_htons(ETH_P_PPPTALK), 1860 .func = atalk_rcv, 1861 }; 1862 1863 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B }; 1864 1865 /* Export symbols for use by drivers when AppleTalk is a module */ 1866 EXPORT_SYMBOL(aarp_send_ddp); 1867 EXPORT_SYMBOL(atrtr_get_dev); 1868 EXPORT_SYMBOL(atalk_find_dev_addr); 1869 1870 static char atalk_err_snap[] __initdata = 1871 KERN_CRIT "Unable to register DDP with SNAP.\n"; 1872 1873 /* Called by proto.c on kernel start up */ 1874 static int __init atalk_init(void) 1875 { 1876 int rc = proto_register(&ddp_proto, 0); 1877 1878 if (rc != 0) 1879 goto out; 1880 1881 (void)sock_register(&atalk_family_ops); 1882 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv); 1883 if (!ddp_dl) 1884 printk(atalk_err_snap); 1885 1886 dev_add_pack(<alk_packet_type); 1887 dev_add_pack(&ppptalk_packet_type); 1888 1889 register_netdevice_notifier(&ddp_notifier); 1890 aarp_proto_init(); 1891 atalk_proc_init(); 1892 atalk_register_sysctl(); 1893 out: 1894 return rc; 1895 } 1896 module_init(atalk_init); 1897 1898 /* 1899 * No explicit module reference count manipulation is needed in the 1900 * protocol. Socket layer sets module reference count for us 1901 * and interfaces reference counting is done 1902 * by the network device layer. 1903 * 1904 * Ergo, before the AppleTalk module can be removed, all AppleTalk 1905 * sockets be closed from user space. 1906 */ 1907 static void __exit atalk_exit(void) 1908 { 1909 #ifdef CONFIG_SYSCTL 1910 atalk_unregister_sysctl(); 1911 #endif /* CONFIG_SYSCTL */ 1912 atalk_proc_exit(); 1913 aarp_cleanup_module(); /* General aarp clean-up. */ 1914 unregister_netdevice_notifier(&ddp_notifier); 1915 dev_remove_pack(<alk_packet_type); 1916 dev_remove_pack(&ppptalk_packet_type); 1917 unregister_snap_client(ddp_dl); 1918 sock_unregister(PF_APPLETALK); 1919 proto_unregister(&ddp_proto); 1920 } 1921 module_exit(atalk_exit); 1922 1923 MODULE_LICENSE("GPL"); 1924 MODULE_AUTHOR("Alan Cox <Alan.Cox@linux.org>"); 1925 MODULE_DESCRIPTION("AppleTalk 0.20\n"); 1926 MODULE_ALIAS_NETPROTO(PF_APPLETALK); 1927