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/config.h> 55 #include <linux/capability.h> 56 #include <linux/module.h> 57 #include <linux/if_arp.h> 58 #include <linux/termios.h> /* For TIOCOUTQ/INQ */ 59 #include <net/datalink.h> 60 #include <net/psnap.h> 61 #include <net/sock.h> 62 #include <net/tcp_states.h> 63 #include <net/route.h> 64 #include <linux/atalk.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 = kmalloc(sizeof(*iface), GFP_KERNEL); 232 233 if (!iface) 234 goto out; 235 236 memset(iface, 0, sizeof(*iface)); 237 dev_hold(dev); 238 iface->dev = dev; 239 dev->atalk_ptr = iface; 240 iface->address = *sa; 241 iface->status = 0; 242 243 write_lock_bh(&atalk_interfaces_lock); 244 iface->next = atalk_interfaces; 245 atalk_interfaces = iface; 246 write_unlock_bh(&atalk_interfaces_lock); 247 out: 248 return iface; 249 } 250 251 /* Perform phase 2 AARP probing on our tentative address */ 252 static int atif_probe_device(struct atalk_iface *atif) 253 { 254 int netrange = ntohs(atif->nets.nr_lastnet) - 255 ntohs(atif->nets.nr_firstnet) + 1; 256 int probe_net = ntohs(atif->address.s_net); 257 int probe_node = atif->address.s_node; 258 int netct, nodect; 259 260 /* Offset the network we start probing with */ 261 if (probe_net == ATADDR_ANYNET) { 262 probe_net = ntohs(atif->nets.nr_firstnet); 263 if (netrange) 264 probe_net += jiffies % netrange; 265 } 266 if (probe_node == ATADDR_ANYNODE) 267 probe_node = jiffies & 0xFF; 268 269 /* Scan the networks */ 270 atif->status |= ATIF_PROBE; 271 for (netct = 0; netct <= netrange; netct++) { 272 /* Sweep the available nodes from a given start */ 273 atif->address.s_net = htons(probe_net); 274 for (nodect = 0; nodect < 256; nodect++) { 275 atif->address.s_node = (nodect + probe_node) & 0xFF; 276 if (atif->address.s_node > 0 && 277 atif->address.s_node < 254) { 278 /* Probe a proposed address */ 279 aarp_probe_network(atif); 280 281 if (!(atif->status & ATIF_PROBE_FAIL)) { 282 atif->status &= ~ATIF_PROBE; 283 return 0; 284 } 285 } 286 atif->status &= ~ATIF_PROBE_FAIL; 287 } 288 probe_net++; 289 if (probe_net > ntohs(atif->nets.nr_lastnet)) 290 probe_net = ntohs(atif->nets.nr_firstnet); 291 } 292 atif->status &= ~ATIF_PROBE; 293 294 return -EADDRINUSE; /* Network is full... */ 295 } 296 297 298 /* Perform AARP probing for a proxy address */ 299 static int atif_proxy_probe_device(struct atalk_iface *atif, 300 struct atalk_addr* proxy_addr) 301 { 302 int netrange = ntohs(atif->nets.nr_lastnet) - 303 ntohs(atif->nets.nr_firstnet) + 1; 304 /* we probe the interface's network */ 305 int probe_net = ntohs(atif->address.s_net); 306 int probe_node = ATADDR_ANYNODE; /* we'll take anything */ 307 int netct, nodect; 308 309 /* Offset the network we start probing with */ 310 if (probe_net == ATADDR_ANYNET) { 311 probe_net = ntohs(atif->nets.nr_firstnet); 312 if (netrange) 313 probe_net += jiffies % netrange; 314 } 315 316 if (probe_node == ATADDR_ANYNODE) 317 probe_node = jiffies & 0xFF; 318 319 /* Scan the networks */ 320 for (netct = 0; netct <= netrange; netct++) { 321 /* Sweep the available nodes from a given start */ 322 proxy_addr->s_net = htons(probe_net); 323 for (nodect = 0; nodect < 256; nodect++) { 324 proxy_addr->s_node = (nodect + probe_node) & 0xFF; 325 if (proxy_addr->s_node > 0 && 326 proxy_addr->s_node < 254) { 327 /* Tell AARP to probe a proposed address */ 328 int ret = aarp_proxy_probe_network(atif, 329 proxy_addr); 330 331 if (ret != -EADDRINUSE) 332 return ret; 333 } 334 } 335 probe_net++; 336 if (probe_net > ntohs(atif->nets.nr_lastnet)) 337 probe_net = ntohs(atif->nets.nr_firstnet); 338 } 339 340 return -EADDRINUSE; /* Network is full... */ 341 } 342 343 344 struct atalk_addr *atalk_find_dev_addr(struct net_device *dev) 345 { 346 struct atalk_iface *iface = dev->atalk_ptr; 347 return iface ? &iface->address : NULL; 348 } 349 350 static struct atalk_addr *atalk_find_primary(void) 351 { 352 struct atalk_iface *fiface = NULL; 353 struct atalk_addr *retval; 354 struct atalk_iface *iface; 355 356 /* 357 * Return a point-to-point interface only if 358 * there is no non-ptp interface available. 359 */ 360 read_lock_bh(&atalk_interfaces_lock); 361 for (iface = atalk_interfaces; iface; iface = iface->next) { 362 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK)) 363 fiface = iface; 364 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { 365 retval = &iface->address; 366 goto out; 367 } 368 } 369 370 if (fiface) 371 retval = &fiface->address; 372 else if (atalk_interfaces) 373 retval = &atalk_interfaces->address; 374 else 375 retval = NULL; 376 out: 377 read_unlock_bh(&atalk_interfaces_lock); 378 return retval; 379 } 380 381 /* 382 * Find a match for 'any network' - ie any of our interfaces with that 383 * node number will do just nicely. 384 */ 385 static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev) 386 { 387 struct atalk_iface *iface = dev->atalk_ptr; 388 389 if (!iface || iface->status & ATIF_PROBE) 390 goto out_err; 391 392 if (node != ATADDR_BCAST && 393 iface->address.s_node != node && 394 node != ATADDR_ANYNODE) 395 goto out_err; 396 out: 397 return iface; 398 out_err: 399 iface = NULL; 400 goto out; 401 } 402 403 /* Find a match for a specific network:node pair */ 404 static struct atalk_iface *atalk_find_interface(__be16 net, int node) 405 { 406 struct atalk_iface *iface; 407 408 read_lock_bh(&atalk_interfaces_lock); 409 for (iface = atalk_interfaces; iface; iface = iface->next) { 410 if ((node == ATADDR_BCAST || 411 node == ATADDR_ANYNODE || 412 iface->address.s_node == node) && 413 iface->address.s_net == net && 414 !(iface->status & ATIF_PROBE)) 415 break; 416 417 /* XXXX.0 -- net.0 returns the iface associated with net */ 418 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET && 419 ntohs(iface->nets.nr_firstnet) <= ntohs(net) && 420 ntohs(net) <= ntohs(iface->nets.nr_lastnet)) 421 break; 422 } 423 read_unlock_bh(&atalk_interfaces_lock); 424 return iface; 425 } 426 427 428 /* 429 * Find a route for an AppleTalk packet. This ought to get cached in 430 * the socket (later on...). We know about host routes and the fact 431 * that a route must be direct to broadcast. 432 */ 433 static struct atalk_route *atrtr_find(struct atalk_addr *target) 434 { 435 /* 436 * we must search through all routes unless we find a 437 * host route, because some host routes might overlap 438 * network routes 439 */ 440 struct atalk_route *net_route = NULL; 441 struct atalk_route *r; 442 443 read_lock_bh(&atalk_routes_lock); 444 for (r = atalk_routes; r; r = r->next) { 445 if (!(r->flags & RTF_UP)) 446 continue; 447 448 if (r->target.s_net == target->s_net) { 449 if (r->flags & RTF_HOST) { 450 /* 451 * if this host route is for the target, 452 * the we're done 453 */ 454 if (r->target.s_node == target->s_node) 455 goto out; 456 } else 457 /* 458 * this route will work if there isn't a 459 * direct host route, so cache it 460 */ 461 net_route = r; 462 } 463 } 464 465 /* 466 * if we found a network route but not a direct host 467 * route, then return it 468 */ 469 if (net_route) 470 r = net_route; 471 else if (atrtr_default.dev) 472 r = &atrtr_default; 473 else /* No route can be found */ 474 r = NULL; 475 out: 476 read_unlock_bh(&atalk_routes_lock); 477 return r; 478 } 479 480 481 /* 482 * Given an AppleTalk network, find the device to use. This can be 483 * a simple lookup. 484 */ 485 struct net_device *atrtr_get_dev(struct atalk_addr *sa) 486 { 487 struct atalk_route *atr = atrtr_find(sa); 488 return atr ? atr->dev : NULL; 489 } 490 491 /* Set up a default router */ 492 static void atrtr_set_default(struct net_device *dev) 493 { 494 atrtr_default.dev = dev; 495 atrtr_default.flags = RTF_UP; 496 atrtr_default.gateway.s_net = htons(0); 497 atrtr_default.gateway.s_node = 0; 498 } 499 500 /* 501 * Add a router. Basically make sure it looks valid and stuff the 502 * entry in the list. While it uses netranges we always set them to one 503 * entry to work like netatalk. 504 */ 505 static int atrtr_create(struct rtentry *r, struct net_device *devhint) 506 { 507 struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst; 508 struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway; 509 struct atalk_route *rt; 510 struct atalk_iface *iface, *riface; 511 int retval = -EINVAL; 512 513 /* 514 * Fixme: Raise/Lower a routing change semaphore for these 515 * operations. 516 */ 517 518 /* Validate the request */ 519 if (ta->sat_family != AF_APPLETALK || 520 (!devhint && ga->sat_family != AF_APPLETALK)) 521 goto out; 522 523 /* Now walk the routing table and make our decisions */ 524 write_lock_bh(&atalk_routes_lock); 525 for (rt = atalk_routes; rt; rt = rt->next) { 526 if (r->rt_flags != rt->flags) 527 continue; 528 529 if (ta->sat_addr.s_net == rt->target.s_net) { 530 if (!(rt->flags & RTF_HOST)) 531 break; 532 if (ta->sat_addr.s_node == rt->target.s_node) 533 break; 534 } 535 } 536 537 if (!devhint) { 538 riface = NULL; 539 540 read_lock_bh(&atalk_interfaces_lock); 541 for (iface = atalk_interfaces; iface; iface = iface->next) { 542 if (!riface && 543 ntohs(ga->sat_addr.s_net) >= 544 ntohs(iface->nets.nr_firstnet) && 545 ntohs(ga->sat_addr.s_net) <= 546 ntohs(iface->nets.nr_lastnet)) 547 riface = iface; 548 549 if (ga->sat_addr.s_net == iface->address.s_net && 550 ga->sat_addr.s_node == iface->address.s_node) 551 riface = iface; 552 } 553 read_unlock_bh(&atalk_interfaces_lock); 554 555 retval = -ENETUNREACH; 556 if (!riface) 557 goto out_unlock; 558 559 devhint = riface->dev; 560 } 561 562 if (!rt) { 563 rt = kmalloc(sizeof(*rt), GFP_ATOMIC); 564 565 retval = -ENOBUFS; 566 if (!rt) 567 goto out_unlock; 568 memset(rt, 0, sizeof(*rt)); 569 570 rt->next = atalk_routes; 571 atalk_routes = rt; 572 } 573 574 /* Fill in the routing entry */ 575 rt->target = ta->sat_addr; 576 dev_hold(devhint); 577 rt->dev = devhint; 578 rt->flags = r->rt_flags; 579 rt->gateway = ga->sat_addr; 580 581 retval = 0; 582 out_unlock: 583 write_unlock_bh(&atalk_routes_lock); 584 out: 585 return retval; 586 } 587 588 /* Delete a route. Find it and discard it */ 589 static int atrtr_delete(struct atalk_addr * addr) 590 { 591 struct atalk_route **r = &atalk_routes; 592 int retval = 0; 593 struct atalk_route *tmp; 594 595 write_lock_bh(&atalk_routes_lock); 596 while ((tmp = *r) != NULL) { 597 if (tmp->target.s_net == addr->s_net && 598 (!(tmp->flags&RTF_GATEWAY) || 599 tmp->target.s_node == addr->s_node)) { 600 *r = tmp->next; 601 dev_put(tmp->dev); 602 kfree(tmp); 603 goto out; 604 } 605 r = &tmp->next; 606 } 607 retval = -ENOENT; 608 out: 609 write_unlock_bh(&atalk_routes_lock); 610 return retval; 611 } 612 613 /* 614 * Called when a device is downed. Just throw away any routes 615 * via it. 616 */ 617 static void atrtr_device_down(struct net_device *dev) 618 { 619 struct atalk_route **r = &atalk_routes; 620 struct atalk_route *tmp; 621 622 write_lock_bh(&atalk_routes_lock); 623 while ((tmp = *r) != NULL) { 624 if (tmp->dev == dev) { 625 *r = tmp->next; 626 dev_put(dev); 627 kfree(tmp); 628 } else 629 r = &tmp->next; 630 } 631 write_unlock_bh(&atalk_routes_lock); 632 633 if (atrtr_default.dev == dev) 634 atrtr_set_default(NULL); 635 } 636 637 /* Actually down the interface */ 638 static inline void atalk_dev_down(struct net_device *dev) 639 { 640 atrtr_device_down(dev); /* Remove all routes for the device */ 641 aarp_device_down(dev); /* Remove AARP entries for the device */ 642 atif_drop_device(dev); /* Remove the device */ 643 } 644 645 /* 646 * A device event has occurred. Watch for devices going down and 647 * delete our use of them (iface and route). 648 */ 649 static int ddp_device_event(struct notifier_block *this, unsigned long event, 650 void *ptr) 651 { 652 if (event == NETDEV_DOWN) 653 /* Discard any use of this */ 654 atalk_dev_down(ptr); 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(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(dev, aarp_mcast, 6, 1); 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 if (!atif) 817 return -EADDRNOTAVAIL; 818 819 /* 820 * for now, we only support proxy AARP on ELAP; 821 * we should be able to do it for LocalTalk, too. 822 */ 823 if (dev->type != ARPHRD_ETHER) 824 return -EPROTONOSUPPORT; 825 826 /* 827 * atif points to the current interface on this network; 828 * we aren't concerned about its current status (at 829 * least for now), but it has all the settings about 830 * the network we're going to probe. Consequently, it 831 * must exist. 832 */ 833 if (!atif) 834 return -EADDRNOTAVAIL; 835 836 nr = (struct atalk_netrange *)&(atif->nets); 837 /* 838 * Phase 1 is fine on Localtalk but we don't do 839 * Ethertalk phase 1. Anyone wanting to add it go ahead. 840 */ 841 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) 842 return -EPROTONOSUPPORT; 843 844 if (sa->sat_addr.s_node == ATADDR_BCAST || 845 sa->sat_addr.s_node == 254) 846 return -EINVAL; 847 848 /* 849 * Check if the chosen address is used. If so we 850 * error and ATCP will try another. 851 */ 852 if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0) 853 return -EADDRINUSE; 854 855 /* 856 * We now have an address on the local network, and 857 * the AARP code will defend it for us until we take it 858 * down. We don't set up any routes right now, because 859 * ATCP will install them manually via SIOCADDRT. 860 */ 861 break; 862 863 case SIOCDARP: 864 if (!capable(CAP_NET_ADMIN)) 865 return -EPERM; 866 if (sa->sat_family != AF_APPLETALK) 867 return -EINVAL; 868 if (!atif) 869 return -EADDRNOTAVAIL; 870 871 /* give to aarp module to remove proxy entry */ 872 aarp_proxy_remove(atif->dev, &(sa->sat_addr)); 873 return 0; 874 } 875 876 return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0; 877 } 878 879 /* Routing ioctl() calls */ 880 static int atrtr_ioctl(unsigned int cmd, void __user *arg) 881 { 882 struct rtentry rt; 883 884 if (copy_from_user(&rt, arg, sizeof(rt))) 885 return -EFAULT; 886 887 switch (cmd) { 888 case SIOCDELRT: 889 if (rt.rt_dst.sa_family != AF_APPLETALK) 890 return -EINVAL; 891 return atrtr_delete(&((struct sockaddr_at *) 892 &rt.rt_dst)->sat_addr); 893 894 case SIOCADDRT: { 895 struct net_device *dev = NULL; 896 if (rt.rt_dev) { 897 char name[IFNAMSIZ]; 898 if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1)) 899 return -EFAULT; 900 name[IFNAMSIZ-1] = '\0'; 901 dev = __dev_get_by_name(name); 902 if (!dev) 903 return -ENODEV; 904 } 905 return atrtr_create(&rt, dev); 906 } 907 } 908 return -EINVAL; 909 } 910 911 /**************************************************************************\ 912 * * 913 * Handling for system calls applied via the various interfaces to an * 914 * AppleTalk socket object. * 915 * * 916 \**************************************************************************/ 917 918 /* 919 * Checksum: This is 'optional'. It's quite likely also a good 920 * candidate for assembler hackery 8) 921 */ 922 static unsigned long atalk_sum_partial(const unsigned char *data, 923 int len, unsigned long sum) 924 { 925 /* This ought to be unwrapped neatly. I'll trust gcc for now */ 926 while (len--) { 927 sum += *data; 928 sum <<= 1; 929 if (sum & 0x10000) { 930 sum++; 931 sum &= 0xffff; 932 } 933 data++; 934 } 935 return sum; 936 } 937 938 /* Checksum skb data -- similar to skb_checksum */ 939 static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset, 940 int len, unsigned long sum) 941 { 942 int start = skb_headlen(skb); 943 int i, copy; 944 945 /* checksum stuff in header space */ 946 if ( (copy = start - offset) > 0) { 947 if (copy > len) 948 copy = len; 949 sum = atalk_sum_partial(skb->data + offset, copy, sum); 950 if ( (len -= copy) == 0) 951 return sum; 952 953 offset += copy; 954 } 955 956 /* checksum stuff in frags */ 957 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 958 int end; 959 960 BUG_TRAP(start <= offset + len); 961 962 end = start + skb_shinfo(skb)->frags[i].size; 963 if ((copy = end - offset) > 0) { 964 u8 *vaddr; 965 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 966 967 if (copy > len) 968 copy = len; 969 vaddr = kmap_skb_frag(frag); 970 sum = atalk_sum_partial(vaddr + frag->page_offset + 971 offset - start, copy, sum); 972 kunmap_skb_frag(vaddr); 973 974 if (!(len -= copy)) 975 return sum; 976 offset += copy; 977 } 978 start = end; 979 } 980 981 if (skb_shinfo(skb)->frag_list) { 982 struct sk_buff *list = skb_shinfo(skb)->frag_list; 983 984 for (; list; list = list->next) { 985 int end; 986 987 BUG_TRAP(start <= offset + len); 988 989 end = start + list->len; 990 if ((copy = end - offset) > 0) { 991 if (copy > len) 992 copy = len; 993 sum = atalk_sum_skb(list, offset - start, 994 copy, sum); 995 if ((len -= copy) == 0) 996 return sum; 997 offset += copy; 998 } 999 start = end; 1000 } 1001 } 1002 1003 BUG_ON(len > 0); 1004 1005 return sum; 1006 } 1007 1008 static unsigned short atalk_checksum(const struct sk_buff *skb, int len) 1009 { 1010 unsigned long sum; 1011 1012 /* skip header 4 bytes */ 1013 sum = atalk_sum_skb(skb, 4, len-4, 0); 1014 1015 /* Use 0xFFFF for 0. 0 itself means none */ 1016 return sum ? htons((unsigned short)sum) : 0xFFFF; 1017 } 1018 1019 static struct proto ddp_proto = { 1020 .name = "DDP", 1021 .owner = THIS_MODULE, 1022 .obj_size = sizeof(struct atalk_sock), 1023 }; 1024 1025 /* 1026 * Create a socket. Initialise the socket, blank the addresses 1027 * set the state. 1028 */ 1029 static int atalk_create(struct socket *sock, int protocol) 1030 { 1031 struct sock *sk; 1032 int rc = -ESOCKTNOSUPPORT; 1033 1034 /* 1035 * We permit SOCK_DGRAM and RAW is an extension. It is trivial to do 1036 * and gives you the full ELAP frame. Should be handy for CAP 8) 1037 */ 1038 if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) 1039 goto out; 1040 rc = -ENOMEM; 1041 sk = sk_alloc(PF_APPLETALK, GFP_KERNEL, &ddp_proto, 1); 1042 if (!sk) 1043 goto out; 1044 rc = 0; 1045 sock->ops = &atalk_dgram_ops; 1046 sock_init_data(sock, sk); 1047 1048 /* Checksums on by default */ 1049 sock_set_flag(sk, SOCK_ZAPPED); 1050 out: 1051 return rc; 1052 } 1053 1054 /* Free a socket. No work needed */ 1055 static int atalk_release(struct socket *sock) 1056 { 1057 struct sock *sk = sock->sk; 1058 1059 if (sk) { 1060 sock_orphan(sk); 1061 sock->sk = NULL; 1062 atalk_destroy_socket(sk); 1063 } 1064 return 0; 1065 } 1066 1067 /** 1068 * atalk_pick_and_bind_port - Pick a source port when one is not given 1069 * @sk - socket to insert into the tables 1070 * @sat - address to search for 1071 * 1072 * Pick a source port when one is not given. If we can find a suitable free 1073 * one, we insert the socket into the tables using it. 1074 * 1075 * This whole operation must be atomic. 1076 */ 1077 static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat) 1078 { 1079 int retval; 1080 1081 write_lock_bh(&atalk_sockets_lock); 1082 1083 for (sat->sat_port = ATPORT_RESERVED; 1084 sat->sat_port < ATPORT_LAST; 1085 sat->sat_port++) { 1086 struct sock *s; 1087 struct hlist_node *node; 1088 1089 sk_for_each(s, node, &atalk_sockets) { 1090 struct atalk_sock *at = at_sk(s); 1091 1092 if (at->src_net == sat->sat_addr.s_net && 1093 at->src_node == sat->sat_addr.s_node && 1094 at->src_port == sat->sat_port) 1095 goto try_next_port; 1096 } 1097 1098 /* Wheee, it's free, assign and insert. */ 1099 __atalk_insert_socket(sk); 1100 at_sk(sk)->src_port = sat->sat_port; 1101 retval = 0; 1102 goto out; 1103 1104 try_next_port:; 1105 } 1106 1107 retval = -EBUSY; 1108 out: 1109 write_unlock_bh(&atalk_sockets_lock); 1110 return retval; 1111 } 1112 1113 static int atalk_autobind(struct sock *sk) 1114 { 1115 struct atalk_sock *at = at_sk(sk); 1116 struct sockaddr_at sat; 1117 struct atalk_addr *ap = atalk_find_primary(); 1118 int n = -EADDRNOTAVAIL; 1119 1120 if (!ap || ap->s_net == htons(ATADDR_ANYNET)) 1121 goto out; 1122 1123 at->src_net = sat.sat_addr.s_net = ap->s_net; 1124 at->src_node = sat.sat_addr.s_node = ap->s_node; 1125 1126 n = atalk_pick_and_bind_port(sk, &sat); 1127 if (!n) 1128 sock_reset_flag(sk, SOCK_ZAPPED); 1129 out: 1130 return n; 1131 } 1132 1133 /* Set the address 'our end' of the connection */ 1134 static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 1135 { 1136 struct sockaddr_at *addr = (struct sockaddr_at *)uaddr; 1137 struct sock *sk = sock->sk; 1138 struct atalk_sock *at = at_sk(sk); 1139 1140 if (!sock_flag(sk, SOCK_ZAPPED) || 1141 addr_len != sizeof(struct sockaddr_at)) 1142 return -EINVAL; 1143 1144 if (addr->sat_family != AF_APPLETALK) 1145 return -EAFNOSUPPORT; 1146 1147 if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) { 1148 struct atalk_addr *ap = atalk_find_primary(); 1149 1150 if (!ap) 1151 return -EADDRNOTAVAIL; 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 if (!atalk_find_interface(addr->sat_addr.s_net, 1157 addr->sat_addr.s_node)) 1158 return -EADDRNOTAVAIL; 1159 1160 at->src_net = addr->sat_addr.s_net; 1161 at->src_node = addr->sat_addr.s_node; 1162 } 1163 1164 if (addr->sat_port == ATADDR_ANYPORT) { 1165 int n = atalk_pick_and_bind_port(sk, addr); 1166 1167 if (n < 0) 1168 return n; 1169 } else { 1170 at->src_port = addr->sat_port; 1171 1172 if (atalk_find_or_insert_socket(sk, addr)) 1173 return -EADDRINUSE; 1174 } 1175 1176 sock_reset_flag(sk, SOCK_ZAPPED); 1177 return 0; 1178 } 1179 1180 /* Set the address we talk to */ 1181 static int atalk_connect(struct socket *sock, struct sockaddr *uaddr, 1182 int addr_len, int flags) 1183 { 1184 struct sock *sk = sock->sk; 1185 struct atalk_sock *at = at_sk(sk); 1186 struct sockaddr_at *addr; 1187 1188 sk->sk_state = TCP_CLOSE; 1189 sock->state = SS_UNCONNECTED; 1190 1191 if (addr_len != sizeof(*addr)) 1192 return -EINVAL; 1193 1194 addr = (struct sockaddr_at *)uaddr; 1195 1196 if (addr->sat_family != AF_APPLETALK) 1197 return -EAFNOSUPPORT; 1198 1199 if (addr->sat_addr.s_node == ATADDR_BCAST && 1200 !sock_flag(sk, SOCK_BROADCAST)) { 1201 #if 1 1202 printk(KERN_WARNING "%s is broken and did not set " 1203 "SO_BROADCAST. It will break when 2.2 is " 1204 "released.\n", 1205 current->comm); 1206 #else 1207 return -EACCES; 1208 #endif 1209 } 1210 1211 if (sock_flag(sk, SOCK_ZAPPED)) 1212 if (atalk_autobind(sk) < 0) 1213 return -EBUSY; 1214 1215 if (!atrtr_get_dev(&addr->sat_addr)) 1216 return -ENETUNREACH; 1217 1218 at->dest_port = addr->sat_port; 1219 at->dest_net = addr->sat_addr.s_net; 1220 at->dest_node = addr->sat_addr.s_node; 1221 1222 sock->state = SS_CONNECTED; 1223 sk->sk_state = TCP_ESTABLISHED; 1224 return 0; 1225 } 1226 1227 /* 1228 * Find the name of an AppleTalk socket. Just copy the right 1229 * fields into the sockaddr. 1230 */ 1231 static int atalk_getname(struct socket *sock, struct sockaddr *uaddr, 1232 int *uaddr_len, int peer) 1233 { 1234 struct sockaddr_at sat; 1235 struct sock *sk = sock->sk; 1236 struct atalk_sock *at = at_sk(sk); 1237 1238 if (sock_flag(sk, SOCK_ZAPPED)) 1239 if (atalk_autobind(sk) < 0) 1240 return -ENOBUFS; 1241 1242 *uaddr_len = sizeof(struct sockaddr_at); 1243 1244 if (peer) { 1245 if (sk->sk_state != TCP_ESTABLISHED) 1246 return -ENOTCONN; 1247 1248 sat.sat_addr.s_net = at->dest_net; 1249 sat.sat_addr.s_node = at->dest_node; 1250 sat.sat_port = at->dest_port; 1251 } else { 1252 sat.sat_addr.s_net = at->src_net; 1253 sat.sat_addr.s_node = at->src_node; 1254 sat.sat_port = at->src_port; 1255 } 1256 1257 sat.sat_family = AF_APPLETALK; 1258 memcpy(uaddr, &sat, sizeof(sat)); 1259 return 0; 1260 } 1261 1262 #if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE) 1263 static __inline__ int is_ip_over_ddp(struct sk_buff *skb) 1264 { 1265 return skb->data[12] == 22; 1266 } 1267 1268 static int handle_ip_over_ddp(struct sk_buff *skb) 1269 { 1270 struct net_device *dev = __dev_get_by_name("ipddp0"); 1271 struct net_device_stats *stats; 1272 1273 /* This needs to be able to handle ipddp"N" devices */ 1274 if (!dev) 1275 return -ENODEV; 1276 1277 skb->protocol = htons(ETH_P_IP); 1278 skb_pull(skb, 13); 1279 skb->dev = dev; 1280 skb->h.raw = skb->data; 1281 1282 stats = dev->priv; 1283 stats->rx_packets++; 1284 stats->rx_bytes += skb->len + 13; 1285 netif_rx(skb); /* Send the SKB up to a higher place. */ 1286 return 0; 1287 } 1288 #else 1289 /* make it easy for gcc to optimize this test out, i.e. kill the code */ 1290 #define is_ip_over_ddp(skb) 0 1291 #define handle_ip_over_ddp(skb) 0 1292 #endif 1293 1294 static void atalk_route_packet(struct sk_buff *skb, struct net_device *dev, 1295 struct ddpehdr *ddp, struct ddpebits *ddphv, 1296 int origlen) 1297 { 1298 struct atalk_route *rt; 1299 struct atalk_addr ta; 1300 1301 /* 1302 * Don't route multicast, etc., packets, or packets sent to "this 1303 * network" 1304 */ 1305 if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) { 1306 /* 1307 * FIXME: 1308 * 1309 * Can it ever happen that a packet is from a PPP iface and 1310 * needs to be broadcast onto the default network? 1311 */ 1312 if (dev->type == ARPHRD_PPP) 1313 printk(KERN_DEBUG "AppleTalk: didn't forward broadcast " 1314 "packet received from PPP iface\n"); 1315 goto free_it; 1316 } 1317 1318 ta.s_net = ddp->deh_dnet; 1319 ta.s_node = ddp->deh_dnode; 1320 1321 /* Route the packet */ 1322 rt = atrtr_find(&ta); 1323 if (!rt || ddphv->deh_hops == DDP_MAXHOPS) 1324 goto free_it; 1325 /* FIXME: use skb->cb to be able to use shared skbs */ 1326 ddphv->deh_hops++; 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 + ddphv->deh_len))); 1342 1343 /* Mend the byte order */ 1344 /* FIXME: use skb->cb to be able to use shared skbs */ 1345 *((__u16 *)ddp) = ntohs(*((__u16 *)ddphv)); 1346 1347 /* 1348 * Send the buffer onwards 1349 * 1350 * Now we must always be careful. If it's come from LocalTalk to 1351 * EtherTalk it might not fit 1352 * 1353 * Order matters here: If a packet has to be copied to make a new 1354 * headroom (rare hopefully) then it won't need unsharing. 1355 * 1356 * Note. ddp-> becomes invalid at the realloc. 1357 */ 1358 if (skb_headroom(skb) < 22) { 1359 /* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */ 1360 struct sk_buff *nskb = skb_realloc_headroom(skb, 32); 1361 kfree_skb(skb); 1362 if (!nskb) 1363 goto out; 1364 skb = nskb; 1365 } else 1366 skb = skb_unshare(skb, GFP_ATOMIC); 1367 1368 /* 1369 * If the buffer didn't vanish into the lack of space bitbucket we can 1370 * send it. 1371 */ 1372 if (skb && aarp_send_ddp(rt->dev, skb, &ta, NULL) == -1) 1373 goto free_it; 1374 out: 1375 return; 1376 free_it: 1377 kfree_skb(skb); 1378 } 1379 1380 /** 1381 * atalk_rcv - Receive a packet (in skb) from device dev 1382 * @skb - packet received 1383 * @dev - network device where the packet comes from 1384 * @pt - packet type 1385 * 1386 * Receive a packet (in skb) from device dev. This has come from the SNAP 1387 * decoder, and on entry skb->h.raw is the DDP header, skb->len is the DDP 1388 * header, skb->len is the DDP length. The physical headers have been 1389 * extracted. PPP should probably pass frames marked as for this layer. 1390 * [ie ARPHRD_ETHERTALK] 1391 */ 1392 static int atalk_rcv(struct sk_buff *skb, struct net_device *dev, 1393 struct packet_type *pt, struct net_device *orig_dev) 1394 { 1395 struct ddpehdr *ddp; 1396 struct sock *sock; 1397 struct atalk_iface *atif; 1398 struct sockaddr_at tosat; 1399 int origlen; 1400 struct ddpebits ddphv; 1401 1402 /* Don't mangle buffer if shared */ 1403 if (!(skb = skb_share_check(skb, GFP_ATOMIC))) 1404 goto out; 1405 1406 /* Size check and make sure header is contiguous */ 1407 if (!pskb_may_pull(skb, sizeof(*ddp))) 1408 goto freeit; 1409 1410 ddp = ddp_hdr(skb); 1411 1412 /* 1413 * Fix up the length field [Ok this is horrible but otherwise 1414 * I end up with unions of bit fields and messy bit field order 1415 * compiler/endian dependencies..] 1416 */ 1417 *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp)); 1418 1419 /* Trim buffer in case of stray trailing data */ 1420 origlen = skb->len; 1421 skb_trim(skb, min_t(unsigned int, skb->len, ddphv.deh_len)); 1422 1423 /* 1424 * Size check to see if ddp->deh_len was crap 1425 * (Otherwise we'll detonate most spectacularly 1426 * in the middle of recvmsg()). 1427 */ 1428 if (skb->len < sizeof(*ddp)) 1429 goto freeit; 1430 1431 /* 1432 * Any checksums. Note we don't do htons() on this == is assumed to be 1433 * valid for net byte orders all over the networking code... 1434 */ 1435 if (ddp->deh_sum && 1436 atalk_checksum(skb, ddphv.deh_len) != ddp->deh_sum) 1437 /* Not a valid AppleTalk frame - dustbin time */ 1438 goto freeit; 1439 1440 /* Check the packet is aimed at us */ 1441 if (!ddp->deh_dnet) /* Net 0 is 'this network' */ 1442 atif = atalk_find_anynet(ddp->deh_dnode, dev); 1443 else 1444 atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode); 1445 1446 if (!atif) { 1447 /* Not ours, so we route the packet via the correct 1448 * AppleTalk iface 1449 */ 1450 atalk_route_packet(skb, dev, ddp, &ddphv, origlen); 1451 goto out; 1452 } 1453 1454 /* if IP over DDP is not selected this code will be optimized out */ 1455 if (is_ip_over_ddp(skb)) 1456 return handle_ip_over_ddp(skb); 1457 /* 1458 * Which socket - atalk_search_socket() looks for a *full match* 1459 * of the <net, node, port> tuple. 1460 */ 1461 tosat.sat_addr.s_net = ddp->deh_dnet; 1462 tosat.sat_addr.s_node = ddp->deh_dnode; 1463 tosat.sat_port = ddp->deh_dport; 1464 1465 sock = atalk_search_socket(&tosat, atif); 1466 if (!sock) /* But not one of our sockets */ 1467 goto freeit; 1468 1469 /* Queue packet (standard) */ 1470 skb->sk = sock; 1471 1472 if (sock_queue_rcv_skb(sock, skb) < 0) 1473 goto freeit; 1474 out: 1475 return 0; 1476 freeit: 1477 kfree_skb(skb); 1478 goto out; 1479 } 1480 1481 /* 1482 * Receive a LocalTalk frame. We make some demands on the caller here. 1483 * Caller must provide enough headroom on the packet to pull the short 1484 * header and append a long one. 1485 */ 1486 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev, 1487 struct packet_type *pt, struct net_device *orig_dev) 1488 { 1489 /* Expand any short form frames */ 1490 if (skb->mac.raw[2] == 1) { 1491 struct ddpehdr *ddp; 1492 /* Find our address */ 1493 struct atalk_addr *ap = atalk_find_dev_addr(dev); 1494 1495 if (!ap || skb->len < sizeof(struct ddpshdr)) 1496 goto freeit; 1497 1498 /* Don't mangle buffer if shared */ 1499 if (!(skb = skb_share_check(skb, GFP_ATOMIC))) 1500 return 0; 1501 1502 /* 1503 * The push leaves us with a ddephdr not an shdr, and 1504 * handily the port bytes in the right place preset. 1505 */ 1506 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4); 1507 1508 /* Now fill in the long header */ 1509 1510 /* 1511 * These two first. The mac overlays the new source/dest 1512 * network information so we MUST copy these before 1513 * we write the network numbers ! 1514 */ 1515 1516 ddp->deh_dnode = skb->mac.raw[0]; /* From physical header */ 1517 ddp->deh_snode = skb->mac.raw[1]; /* From physical header */ 1518 1519 ddp->deh_dnet = ap->s_net; /* Network number */ 1520 ddp->deh_snet = ap->s_net; 1521 ddp->deh_sum = 0; /* No checksum */ 1522 /* 1523 * Not sure about this bit... 1524 */ 1525 ddp->deh_len = skb->len; 1526 ddp->deh_hops = DDP_MAXHOPS; /* Non routable, so force a drop 1527 if we slip up later */ 1528 /* Mend the byte order */ 1529 *((__u16 *)ddp) = htons(*((__u16 *)ddp)); 1530 } 1531 skb->h.raw = skb->data; 1532 1533 return atalk_rcv(skb, dev, pt, orig_dev); 1534 freeit: 1535 kfree_skb(skb); 1536 return 0; 1537 } 1538 1539 static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 1540 size_t len) 1541 { 1542 struct sock *sk = sock->sk; 1543 struct atalk_sock *at = at_sk(sk); 1544 struct sockaddr_at *usat = (struct sockaddr_at *)msg->msg_name; 1545 int flags = msg->msg_flags; 1546 int loopback = 0; 1547 struct sockaddr_at local_satalk, gsat; 1548 struct sk_buff *skb; 1549 struct net_device *dev; 1550 struct ddpehdr *ddp; 1551 int size; 1552 struct atalk_route *rt; 1553 int err; 1554 1555 if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) 1556 return -EINVAL; 1557 1558 if (len > DDP_MAXSZ) 1559 return -EMSGSIZE; 1560 1561 if (usat) { 1562 if (sock_flag(sk, SOCK_ZAPPED)) 1563 if (atalk_autobind(sk) < 0) 1564 return -EBUSY; 1565 1566 if (msg->msg_namelen < sizeof(*usat) || 1567 usat->sat_family != AF_APPLETALK) 1568 return -EINVAL; 1569 1570 /* netatalk doesn't implement this check */ 1571 if (usat->sat_addr.s_node == ATADDR_BCAST && 1572 !sock_flag(sk, SOCK_BROADCAST)) { 1573 printk(KERN_INFO "SO_BROADCAST: Fix your netatalk as " 1574 "it will break before 2.2\n"); 1575 #if 0 1576 return -EPERM; 1577 #endif 1578 } 1579 } else { 1580 if (sk->sk_state != TCP_ESTABLISHED) 1581 return -ENOTCONN; 1582 usat = &local_satalk; 1583 usat->sat_family = AF_APPLETALK; 1584 usat->sat_port = at->dest_port; 1585 usat->sat_addr.s_node = at->dest_node; 1586 usat->sat_addr.s_net = at->dest_net; 1587 } 1588 1589 /* Build a packet */ 1590 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk); 1591 1592 /* For headers */ 1593 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length; 1594 1595 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) { 1596 rt = atrtr_find(&usat->sat_addr); 1597 dev = rt->dev; 1598 } else { 1599 struct atalk_addr at_hint; 1600 1601 at_hint.s_node = 0; 1602 at_hint.s_net = at->src_net; 1603 1604 rt = atrtr_find(&at_hint); 1605 dev = rt->dev; 1606 } 1607 if (!rt) 1608 return -ENETUNREACH; 1609 1610 dev = rt->dev; 1611 1612 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n", 1613 sk, size, dev->name); 1614 1615 size += dev->hard_header_len; 1616 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err); 1617 if (!skb) 1618 return err; 1619 1620 skb->sk = sk; 1621 skb_reserve(skb, ddp_dl->header_length); 1622 skb_reserve(skb, dev->hard_header_len); 1623 skb->dev = dev; 1624 1625 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk); 1626 1627 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr)); 1628 ddp->deh_pad = 0; 1629 ddp->deh_hops = 0; 1630 ddp->deh_len = len + sizeof(*ddp); 1631 /* 1632 * Fix up the length field [Ok this is horrible but otherwise 1633 * I end up with unions of bit fields and messy bit field order 1634 * compiler/endian dependencies.. 1635 */ 1636 *((__u16 *)ddp) = ntohs(*((__u16 *)ddp)); 1637 1638 ddp->deh_dnet = usat->sat_addr.s_net; 1639 ddp->deh_snet = at->src_net; 1640 ddp->deh_dnode = usat->sat_addr.s_node; 1641 ddp->deh_snode = at->src_node; 1642 ddp->deh_dport = usat->sat_port; 1643 ddp->deh_sport = at->src_port; 1644 1645 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len); 1646 1647 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); 1648 if (err) { 1649 kfree_skb(skb); 1650 return -EFAULT; 1651 } 1652 1653 if (sk->sk_no_check == 1) 1654 ddp->deh_sum = 0; 1655 else 1656 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp)); 1657 1658 /* 1659 * Loopback broadcast packets to non gateway targets (ie routes 1660 * to group we are in) 1661 */ 1662 if (ddp->deh_dnode == ATADDR_BCAST && 1663 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) { 1664 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL); 1665 1666 if (skb2) { 1667 loopback = 1; 1668 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk); 1669 if (aarp_send_ddp(dev, skb2, 1670 &usat->sat_addr, NULL) == -1) 1671 kfree_skb(skb2); 1672 /* else queued/sent above in the aarp queue */ 1673 } 1674 } 1675 1676 if (dev->flags & IFF_LOOPBACK || loopback) { 1677 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk); 1678 /* loop back */ 1679 skb_orphan(skb); 1680 if (ddp->deh_dnode == ATADDR_BCAST) { 1681 struct atalk_addr at_lo; 1682 1683 at_lo.s_node = 0; 1684 at_lo.s_net = 0; 1685 1686 rt = atrtr_find(&at_lo); 1687 if (!rt) { 1688 kfree_skb(skb); 1689 return -ENETUNREACH; 1690 } 1691 dev = rt->dev; 1692 skb->dev = dev; 1693 } 1694 ddp_dl->request(ddp_dl, skb, dev->dev_addr); 1695 } else { 1696 SOCK_DEBUG(sk, "SK %p: send out.\n", sk); 1697 if (rt->flags & RTF_GATEWAY) { 1698 gsat.sat_addr = rt->gateway; 1699 usat = &gsat; 1700 } 1701 1702 if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1) 1703 kfree_skb(skb); 1704 /* else queued/sent above in the aarp queue */ 1705 } 1706 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len); 1707 1708 return len; 1709 } 1710 1711 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 1712 size_t size, int flags) 1713 { 1714 struct sock *sk = sock->sk; 1715 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name; 1716 struct ddpehdr *ddp; 1717 int copied = 0; 1718 int err = 0; 1719 struct ddpebits ddphv; 1720 struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1721 flags & MSG_DONTWAIT, &err); 1722 if (!skb) 1723 return err; 1724 1725 /* FIXME: use skb->cb to be able to use shared skbs */ 1726 ddp = ddp_hdr(skb); 1727 *((__u16 *)&ddphv) = ntohs(*((__u16 *)ddp)); 1728 1729 if (sk->sk_type == SOCK_RAW) { 1730 copied = ddphv.deh_len; 1731 if (copied > size) { 1732 copied = size; 1733 msg->msg_flags |= MSG_TRUNC; 1734 } 1735 1736 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1737 } else { 1738 copied = ddphv.deh_len - sizeof(*ddp); 1739 if (copied > size) { 1740 copied = size; 1741 msg->msg_flags |= MSG_TRUNC; 1742 } 1743 err = skb_copy_datagram_iovec(skb, sizeof(*ddp), 1744 msg->msg_iov, copied); 1745 } 1746 1747 if (!err) { 1748 if (sat) { 1749 sat->sat_family = AF_APPLETALK; 1750 sat->sat_port = ddp->deh_sport; 1751 sat->sat_addr.s_node = ddp->deh_snode; 1752 sat->sat_addr.s_net = ddp->deh_snet; 1753 } 1754 msg->msg_namelen = sizeof(*sat); 1755 } 1756 1757 skb_free_datagram(sk, skb); /* Free the datagram. */ 1758 return err ? : copied; 1759 } 1760 1761 1762 /* 1763 * AppleTalk ioctl calls. 1764 */ 1765 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1766 { 1767 int rc = -ENOIOCTLCMD; 1768 struct sock *sk = sock->sk; 1769 void __user *argp = (void __user *)arg; 1770 1771 switch (cmd) { 1772 /* Protocol layer */ 1773 case TIOCOUTQ: { 1774 long amount = sk->sk_sndbuf - 1775 atomic_read(&sk->sk_wmem_alloc); 1776 1777 if (amount < 0) 1778 amount = 0; 1779 rc = put_user(amount, (int __user *)argp); 1780 break; 1781 } 1782 case TIOCINQ: { 1783 /* 1784 * These two are safe on a single CPU system as only 1785 * user tasks fiddle here 1786 */ 1787 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); 1788 long amount = 0; 1789 1790 if (skb) 1791 amount = skb->len - sizeof(struct ddpehdr); 1792 rc = put_user(amount, (int __user *)argp); 1793 break; 1794 } 1795 case SIOCGSTAMP: 1796 rc = sock_get_timestamp(sk, argp); 1797 break; 1798 /* Routing */ 1799 case SIOCADDRT: 1800 case SIOCDELRT: 1801 rc = -EPERM; 1802 if (capable(CAP_NET_ADMIN)) 1803 rc = atrtr_ioctl(cmd, argp); 1804 break; 1805 /* Interface */ 1806 case SIOCGIFADDR: 1807 case SIOCSIFADDR: 1808 case SIOCGIFBRDADDR: 1809 case SIOCATALKDIFADDR: 1810 case SIOCDIFADDR: 1811 case SIOCSARP: /* proxy AARP */ 1812 case SIOCDARP: /* proxy AARP */ 1813 rtnl_lock(); 1814 rc = atif_ioctl(cmd, argp); 1815 rtnl_unlock(); 1816 break; 1817 } 1818 1819 return rc; 1820 } 1821 1822 1823 #ifdef CONFIG_COMPAT 1824 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1825 { 1826 /* 1827 * All Appletalk ioctls except SIOCATALKDIFADDR are standard. And 1828 * SIOCATALKDIFADDR is handled by upper layer as well, so there is 1829 * nothing to do. Eventually SIOCATALKDIFADDR should be moved 1830 * here so there is no generic SIOCPROTOPRIVATE translation in the 1831 * system. 1832 */ 1833 return -ENOIOCTLCMD; 1834 } 1835 #endif 1836 1837 1838 static struct net_proto_family atalk_family_ops = { 1839 .family = PF_APPLETALK, 1840 .create = atalk_create, 1841 .owner = THIS_MODULE, 1842 }; 1843 1844 static const struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = { 1845 .family = PF_APPLETALK, 1846 .owner = THIS_MODULE, 1847 .release = atalk_release, 1848 .bind = atalk_bind, 1849 .connect = atalk_connect, 1850 .socketpair = sock_no_socketpair, 1851 .accept = sock_no_accept, 1852 .getname = atalk_getname, 1853 .poll = datagram_poll, 1854 .ioctl = atalk_ioctl, 1855 #ifdef CONFIG_COMPAT 1856 .compat_ioctl = atalk_compat_ioctl, 1857 #endif 1858 .listen = sock_no_listen, 1859 .shutdown = sock_no_shutdown, 1860 .setsockopt = sock_no_setsockopt, 1861 .getsockopt = sock_no_getsockopt, 1862 .sendmsg = atalk_sendmsg, 1863 .recvmsg = atalk_recvmsg, 1864 .mmap = sock_no_mmap, 1865 .sendpage = sock_no_sendpage, 1866 }; 1867 1868 #include <linux/smp_lock.h> 1869 SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK); 1870 1871 static struct notifier_block ddp_notifier = { 1872 .notifier_call = ddp_device_event, 1873 }; 1874 1875 static struct packet_type ltalk_packet_type = { 1876 .type = __constant_htons(ETH_P_LOCALTALK), 1877 .func = ltalk_rcv, 1878 }; 1879 1880 static struct packet_type ppptalk_packet_type = { 1881 .type = __constant_htons(ETH_P_PPPTALK), 1882 .func = atalk_rcv, 1883 }; 1884 1885 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B }; 1886 1887 /* Export symbols for use by drivers when AppleTalk is a module */ 1888 EXPORT_SYMBOL(aarp_send_ddp); 1889 EXPORT_SYMBOL(atrtr_get_dev); 1890 EXPORT_SYMBOL(atalk_find_dev_addr); 1891 1892 static char atalk_err_snap[] __initdata = 1893 KERN_CRIT "Unable to register DDP with SNAP.\n"; 1894 1895 /* Called by proto.c on kernel start up */ 1896 static int __init atalk_init(void) 1897 { 1898 int rc = proto_register(&ddp_proto, 0); 1899 1900 if (rc != 0) 1901 goto out; 1902 1903 (void)sock_register(&atalk_family_ops); 1904 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv); 1905 if (!ddp_dl) 1906 printk(atalk_err_snap); 1907 1908 dev_add_pack(<alk_packet_type); 1909 dev_add_pack(&ppptalk_packet_type); 1910 1911 register_netdevice_notifier(&ddp_notifier); 1912 aarp_proto_init(); 1913 atalk_proc_init(); 1914 atalk_register_sysctl(); 1915 out: 1916 return rc; 1917 } 1918 module_init(atalk_init); 1919 1920 /* 1921 * No explicit module reference count manipulation is needed in the 1922 * protocol. Socket layer sets module reference count for us 1923 * and interfaces reference counting is done 1924 * by the network device layer. 1925 * 1926 * Ergo, before the AppleTalk module can be removed, all AppleTalk 1927 * sockets be closed from user space. 1928 */ 1929 static void __exit atalk_exit(void) 1930 { 1931 #ifdef CONFIG_SYSCTL 1932 atalk_unregister_sysctl(); 1933 #endif /* CONFIG_SYSCTL */ 1934 atalk_proc_exit(); 1935 aarp_cleanup_module(); /* General aarp clean-up. */ 1936 unregister_netdevice_notifier(&ddp_notifier); 1937 dev_remove_pack(<alk_packet_type); 1938 dev_remove_pack(&ppptalk_packet_type); 1939 unregister_snap_client(ddp_dl); 1940 sock_unregister(PF_APPLETALK); 1941 proto_unregister(&ddp_proto); 1942 } 1943 module_exit(atalk_exit); 1944 1945 MODULE_LICENSE("GPL"); 1946 MODULE_AUTHOR("Alan Cox <Alan.Cox@linux.org>"); 1947 MODULE_DESCRIPTION("AppleTalk 0.20\n"); 1948 MODULE_ALIAS_NETPROTO(PF_APPLETALK); 1949