1 /* 2 * DDP: An implementation of the AppleTalk DDP protocol for 3 * Ethernet 'ELAP'. 4 * 5 * Alan Cox <alan@lxorguk.ukuu.org.uk> 6 * 7 * With more than a little assistance from 8 * 9 * Wesley Craig <netatalk@umich.edu> 10 * 11 * Fixes: 12 * Neil Horman : Added missing device ioctls 13 * Michael Callahan : Made routing work 14 * Wesley Craig : Fix probing to listen to a 15 * passed node id. 16 * Alan Cox : Added send/recvmsg support 17 * Alan Cox : Moved at. to protinfo in 18 * socket. 19 * Alan Cox : Added firewall hooks. 20 * Alan Cox : Supports new ARPHRD_LOOPBACK 21 * Christer Weinigel : Routing and /proc fixes. 22 * Bradford Johnson : LocalTalk. 23 * Tom Dyas : Module support. 24 * Alan Cox : Hooks for PPP (based on the 25 * LocalTalk hook). 26 * Alan Cox : Posix bits 27 * Alan Cox/Mike Freeman : Possible fix to NBP problems 28 * Bradford Johnson : IP-over-DDP (experimental) 29 * Jay Schulist : Moved IP-over-DDP to its own 30 * driver file. (ipddp.c & ipddp.h) 31 * Jay Schulist : Made work as module with 32 * AppleTalk drivers, cleaned it. 33 * Rob Newberry : Added proxy AARP and AARP 34 * procfs, moved probing to AARP 35 * module. 36 * Adrian Sun/ 37 * Michael Zuelsdorff : fix for net.0 packets. don't 38 * allow illegal ether/tokentalk 39 * port assignment. we lose a 40 * valid localtalk port as a 41 * result. 42 * Arnaldo C. de Melo : Cleanup, in preparation for 43 * shared skb support 8) 44 * Arnaldo C. de Melo : Move proc stuff to atalk_proc.c, 45 * use seq_file 46 * 47 * This program is free software; you can redistribute it and/or 48 * modify it under the terms of the GNU General Public License 49 * as published by the Free Software Foundation; either version 50 * 2 of the License, or (at your option) any later version. 51 * 52 */ 53 54 #include <linux/capability.h> 55 #include <linux/module.h> 56 #include <linux/if_arp.h> 57 #include <linux/smp_lock.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 #include "../core/kmap_skb.h" 66 67 struct datalink_proto *ddp_dl, *aarp_dl; 68 static const struct proto_ops atalk_dgram_ops; 69 70 /**************************************************************************\ 71 * * 72 * Handlers for the socket list. * 73 * * 74 \**************************************************************************/ 75 76 HLIST_HEAD(atalk_sockets); 77 DEFINE_RWLOCK(atalk_sockets_lock); 78 79 static inline void __atalk_insert_socket(struct sock *sk) 80 { 81 sk_add_node(sk, &atalk_sockets); 82 } 83 84 static inline void atalk_remove_socket(struct sock *sk) 85 { 86 write_lock_bh(&atalk_sockets_lock); 87 sk_del_node_init(sk); 88 write_unlock_bh(&atalk_sockets_lock); 89 } 90 91 static struct sock *atalk_search_socket(struct sockaddr_at *to, 92 struct atalk_iface *atif) 93 { 94 struct sock *s; 95 struct hlist_node *node; 96 97 read_lock_bh(&atalk_sockets_lock); 98 sk_for_each(s, node, &atalk_sockets) { 99 struct atalk_sock *at = at_sk(s); 100 101 if (to->sat_port != at->src_port) 102 continue; 103 104 if (to->sat_addr.s_net == ATADDR_ANYNET && 105 to->sat_addr.s_node == ATADDR_BCAST) 106 goto found; 107 108 if (to->sat_addr.s_net == at->src_net && 109 (to->sat_addr.s_node == at->src_node || 110 to->sat_addr.s_node == ATADDR_BCAST || 111 to->sat_addr.s_node == ATADDR_ANYNODE)) 112 goto found; 113 114 /* XXXX.0 -- we got a request for this router. make sure 115 * that the node is appropriately set. */ 116 if (to->sat_addr.s_node == ATADDR_ANYNODE && 117 to->sat_addr.s_net != ATADDR_ANYNET && 118 atif->address.s_node == at->src_node) { 119 to->sat_addr.s_node = atif->address.s_node; 120 goto found; 121 } 122 } 123 s = NULL; 124 found: 125 read_unlock_bh(&atalk_sockets_lock); 126 return s; 127 } 128 129 /** 130 * atalk_find_or_insert_socket - Try to find a socket matching ADDR 131 * @sk - socket to insert in the list if it is not there already 132 * @sat - address to search for 133 * 134 * Try to find a socket matching ADDR in the socket list, if found then return 135 * it. If not, insert SK into the socket list. 136 * 137 * This entire operation must execute atomically. 138 */ 139 static struct sock *atalk_find_or_insert_socket(struct sock *sk, 140 struct sockaddr_at *sat) 141 { 142 struct sock *s; 143 struct hlist_node *node; 144 struct atalk_sock *at; 145 146 write_lock_bh(&atalk_sockets_lock); 147 sk_for_each(s, node, &atalk_sockets) { 148 at = at_sk(s); 149 150 if (at->src_net == sat->sat_addr.s_net && 151 at->src_node == sat->sat_addr.s_node && 152 at->src_port == sat->sat_port) 153 goto found; 154 } 155 s = NULL; 156 __atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */ 157 found: 158 write_unlock_bh(&atalk_sockets_lock); 159 return s; 160 } 161 162 static void atalk_destroy_timer(unsigned long data) 163 { 164 struct sock *sk = (struct sock *)data; 165 166 if (sk_has_allocations(sk)) { 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 (sk_has_allocations(sk)) { 179 setup_timer(&sk->sk_timer, atalk_destroy_timer, 180 (unsigned long)sk); 181 sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME; 182 add_timer(&sk->sk_timer); 183 } else 184 sock_put(sk); 185 } 186 187 /**************************************************************************\ 188 * * 189 * Routing tables for the AppleTalk socket layer. * 190 * * 191 \**************************************************************************/ 192 193 /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */ 194 struct atalk_route *atalk_routes; 195 DEFINE_RWLOCK(atalk_routes_lock); 196 197 struct atalk_iface *atalk_interfaces; 198 DEFINE_RWLOCK(atalk_interfaces_lock); 199 200 /* For probing devices or in a routerless network */ 201 struct atalk_route atrtr_default; 202 203 /* AppleTalk interface control */ 204 /* 205 * Drop a device. Doesn't drop any of its routes - that is the caller's 206 * problem. Called when we down the interface or delete the address. 207 */ 208 static void atif_drop_device(struct net_device *dev) 209 { 210 struct atalk_iface **iface = &atalk_interfaces; 211 struct atalk_iface *tmp; 212 213 write_lock_bh(&atalk_interfaces_lock); 214 while ((tmp = *iface) != NULL) { 215 if (tmp->dev == dev) { 216 *iface = tmp->next; 217 dev_put(dev); 218 kfree(tmp); 219 dev->atalk_ptr = NULL; 220 } else 221 iface = &tmp->next; 222 } 223 write_unlock_bh(&atalk_interfaces_lock); 224 } 225 226 static struct atalk_iface *atif_add_device(struct net_device *dev, 227 struct atalk_addr *sa) 228 { 229 struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL); 230 231 if (!iface) 232 goto out; 233 234 dev_hold(dev); 235 iface->dev = dev; 236 dev->atalk_ptr = iface; 237 iface->address = *sa; 238 iface->status = 0; 239 240 write_lock_bh(&atalk_interfaces_lock); 241 iface->next = atalk_interfaces; 242 atalk_interfaces = iface; 243 write_unlock_bh(&atalk_interfaces_lock); 244 out: 245 return iface; 246 } 247 248 /* Perform phase 2 AARP probing on our tentative address */ 249 static int atif_probe_device(struct atalk_iface *atif) 250 { 251 int netrange = ntohs(atif->nets.nr_lastnet) - 252 ntohs(atif->nets.nr_firstnet) + 1; 253 int probe_net = ntohs(atif->address.s_net); 254 int probe_node = atif->address.s_node; 255 int netct, nodect; 256 257 /* Offset the network we start probing with */ 258 if (probe_net == ATADDR_ANYNET) { 259 probe_net = ntohs(atif->nets.nr_firstnet); 260 if (netrange) 261 probe_net += jiffies % netrange; 262 } 263 if (probe_node == ATADDR_ANYNODE) 264 probe_node = jiffies & 0xFF; 265 266 /* Scan the networks */ 267 atif->status |= ATIF_PROBE; 268 for (netct = 0; netct <= netrange; netct++) { 269 /* Sweep the available nodes from a given start */ 270 atif->address.s_net = htons(probe_net); 271 for (nodect = 0; nodect < 256; nodect++) { 272 atif->address.s_node = (nodect + probe_node) & 0xFF; 273 if (atif->address.s_node > 0 && 274 atif->address.s_node < 254) { 275 /* Probe a proposed address */ 276 aarp_probe_network(atif); 277 278 if (!(atif->status & ATIF_PROBE_FAIL)) { 279 atif->status &= ~ATIF_PROBE; 280 return 0; 281 } 282 } 283 atif->status &= ~ATIF_PROBE_FAIL; 284 } 285 probe_net++; 286 if (probe_net > ntohs(atif->nets.nr_lastnet)) 287 probe_net = ntohs(atif->nets.nr_firstnet); 288 } 289 atif->status &= ~ATIF_PROBE; 290 291 return -EADDRINUSE; /* Network is full... */ 292 } 293 294 295 /* Perform AARP probing for a proxy address */ 296 static int atif_proxy_probe_device(struct atalk_iface *atif, 297 struct atalk_addr* proxy_addr) 298 { 299 int netrange = ntohs(atif->nets.nr_lastnet) - 300 ntohs(atif->nets.nr_firstnet) + 1; 301 /* we probe the interface's network */ 302 int probe_net = ntohs(atif->address.s_net); 303 int probe_node = ATADDR_ANYNODE; /* we'll take anything */ 304 int netct, nodect; 305 306 /* Offset the network we start probing with */ 307 if (probe_net == ATADDR_ANYNET) { 308 probe_net = ntohs(atif->nets.nr_firstnet); 309 if (netrange) 310 probe_net += jiffies % netrange; 311 } 312 313 if (probe_node == ATADDR_ANYNODE) 314 probe_node = jiffies & 0xFF; 315 316 /* Scan the networks */ 317 for (netct = 0; netct <= netrange; netct++) { 318 /* Sweep the available nodes from a given start */ 319 proxy_addr->s_net = htons(probe_net); 320 for (nodect = 0; nodect < 256; nodect++) { 321 proxy_addr->s_node = (nodect + probe_node) & 0xFF; 322 if (proxy_addr->s_node > 0 && 323 proxy_addr->s_node < 254) { 324 /* Tell AARP to probe a proposed address */ 325 int ret = aarp_proxy_probe_network(atif, 326 proxy_addr); 327 328 if (ret != -EADDRINUSE) 329 return ret; 330 } 331 } 332 probe_net++; 333 if (probe_net > ntohs(atif->nets.nr_lastnet)) 334 probe_net = ntohs(atif->nets.nr_firstnet); 335 } 336 337 return -EADDRINUSE; /* Network is full... */ 338 } 339 340 341 struct atalk_addr *atalk_find_dev_addr(struct net_device *dev) 342 { 343 struct atalk_iface *iface = dev->atalk_ptr; 344 return iface ? &iface->address : NULL; 345 } 346 347 static struct atalk_addr *atalk_find_primary(void) 348 { 349 struct atalk_iface *fiface = NULL; 350 struct atalk_addr *retval; 351 struct atalk_iface *iface; 352 353 /* 354 * Return a point-to-point interface only if 355 * there is no non-ptp interface available. 356 */ 357 read_lock_bh(&atalk_interfaces_lock); 358 for (iface = atalk_interfaces; iface; iface = iface->next) { 359 if (!fiface && !(iface->dev->flags & IFF_LOOPBACK)) 360 fiface = iface; 361 if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { 362 retval = &iface->address; 363 goto out; 364 } 365 } 366 367 if (fiface) 368 retval = &fiface->address; 369 else if (atalk_interfaces) 370 retval = &atalk_interfaces->address; 371 else 372 retval = NULL; 373 out: 374 read_unlock_bh(&atalk_interfaces_lock); 375 return retval; 376 } 377 378 /* 379 * Find a match for 'any network' - ie any of our interfaces with that 380 * node number will do just nicely. 381 */ 382 static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev) 383 { 384 struct atalk_iface *iface = dev->atalk_ptr; 385 386 if (!iface || iface->status & ATIF_PROBE) 387 goto out_err; 388 389 if (node != ATADDR_BCAST && 390 iface->address.s_node != node && 391 node != ATADDR_ANYNODE) 392 goto out_err; 393 out: 394 return iface; 395 out_err: 396 iface = NULL; 397 goto out; 398 } 399 400 /* Find a match for a specific network:node pair */ 401 static struct atalk_iface *atalk_find_interface(__be16 net, int node) 402 { 403 struct atalk_iface *iface; 404 405 read_lock_bh(&atalk_interfaces_lock); 406 for (iface = atalk_interfaces; iface; iface = iface->next) { 407 if ((node == ATADDR_BCAST || 408 node == ATADDR_ANYNODE || 409 iface->address.s_node == node) && 410 iface->address.s_net == net && 411 !(iface->status & ATIF_PROBE)) 412 break; 413 414 /* XXXX.0 -- net.0 returns the iface associated with net */ 415 if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET && 416 ntohs(iface->nets.nr_firstnet) <= ntohs(net) && 417 ntohs(net) <= ntohs(iface->nets.nr_lastnet)) 418 break; 419 } 420 read_unlock_bh(&atalk_interfaces_lock); 421 return iface; 422 } 423 424 425 /* 426 * Find a route for an AppleTalk packet. This ought to get cached in 427 * the socket (later on...). We know about host routes and the fact 428 * that a route must be direct to broadcast. 429 */ 430 static struct atalk_route *atrtr_find(struct atalk_addr *target) 431 { 432 /* 433 * we must search through all routes unless we find a 434 * host route, because some host routes might overlap 435 * network routes 436 */ 437 struct atalk_route *net_route = NULL; 438 struct atalk_route *r; 439 440 read_lock_bh(&atalk_routes_lock); 441 for (r = atalk_routes; r; r = r->next) { 442 if (!(r->flags & RTF_UP)) 443 continue; 444 445 if (r->target.s_net == target->s_net) { 446 if (r->flags & RTF_HOST) { 447 /* 448 * if this host route is for the target, 449 * the we're done 450 */ 451 if (r->target.s_node == target->s_node) 452 goto out; 453 } else 454 /* 455 * this route will work if there isn't a 456 * direct host route, so cache it 457 */ 458 net_route = r; 459 } 460 } 461 462 /* 463 * if we found a network route but not a direct host 464 * route, then return it 465 */ 466 if (net_route) 467 r = net_route; 468 else if (atrtr_default.dev) 469 r = &atrtr_default; 470 else /* No route can be found */ 471 r = NULL; 472 out: 473 read_unlock_bh(&atalk_routes_lock); 474 return r; 475 } 476 477 478 /* 479 * Given an AppleTalk network, find the device to use. This can be 480 * a simple lookup. 481 */ 482 struct net_device *atrtr_get_dev(struct atalk_addr *sa) 483 { 484 struct atalk_route *atr = atrtr_find(sa); 485 return atr ? atr->dev : NULL; 486 } 487 488 /* Set up a default router */ 489 static void atrtr_set_default(struct net_device *dev) 490 { 491 atrtr_default.dev = dev; 492 atrtr_default.flags = RTF_UP; 493 atrtr_default.gateway.s_net = htons(0); 494 atrtr_default.gateway.s_node = 0; 495 } 496 497 /* 498 * Add a router. Basically make sure it looks valid and stuff the 499 * entry in the list. While it uses netranges we always set them to one 500 * entry to work like netatalk. 501 */ 502 static int atrtr_create(struct rtentry *r, struct net_device *devhint) 503 { 504 struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst; 505 struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway; 506 struct atalk_route *rt; 507 struct atalk_iface *iface, *riface; 508 int retval = -EINVAL; 509 510 /* 511 * Fixme: Raise/Lower a routing change semaphore for these 512 * operations. 513 */ 514 515 /* Validate the request */ 516 if (ta->sat_family != AF_APPLETALK || 517 (!devhint && ga->sat_family != AF_APPLETALK)) 518 goto out; 519 520 /* Now walk the routing table and make our decisions */ 521 write_lock_bh(&atalk_routes_lock); 522 for (rt = atalk_routes; rt; rt = rt->next) { 523 if (r->rt_flags != rt->flags) 524 continue; 525 526 if (ta->sat_addr.s_net == rt->target.s_net) { 527 if (!(rt->flags & RTF_HOST)) 528 break; 529 if (ta->sat_addr.s_node == rt->target.s_node) 530 break; 531 } 532 } 533 534 if (!devhint) { 535 riface = NULL; 536 537 read_lock_bh(&atalk_interfaces_lock); 538 for (iface = atalk_interfaces; iface; iface = iface->next) { 539 if (!riface && 540 ntohs(ga->sat_addr.s_net) >= 541 ntohs(iface->nets.nr_firstnet) && 542 ntohs(ga->sat_addr.s_net) <= 543 ntohs(iface->nets.nr_lastnet)) 544 riface = iface; 545 546 if (ga->sat_addr.s_net == iface->address.s_net && 547 ga->sat_addr.s_node == iface->address.s_node) 548 riface = iface; 549 } 550 read_unlock_bh(&atalk_interfaces_lock); 551 552 retval = -ENETUNREACH; 553 if (!riface) 554 goto out_unlock; 555 556 devhint = riface->dev; 557 } 558 559 if (!rt) { 560 rt = kzalloc(sizeof(*rt), GFP_ATOMIC); 561 562 retval = -ENOBUFS; 563 if (!rt) 564 goto out_unlock; 565 566 rt->next = atalk_routes; 567 atalk_routes = rt; 568 } 569 570 /* Fill in the routing entry */ 571 rt->target = ta->sat_addr; 572 dev_hold(devhint); 573 rt->dev = devhint; 574 rt->flags = r->rt_flags; 575 rt->gateway = ga->sat_addr; 576 577 retval = 0; 578 out_unlock: 579 write_unlock_bh(&atalk_routes_lock); 580 out: 581 return retval; 582 } 583 584 /* Delete a route. Find it and discard it */ 585 static int atrtr_delete(struct atalk_addr * addr) 586 { 587 struct atalk_route **r = &atalk_routes; 588 int retval = 0; 589 struct atalk_route *tmp; 590 591 write_lock_bh(&atalk_routes_lock); 592 while ((tmp = *r) != NULL) { 593 if (tmp->target.s_net == addr->s_net && 594 (!(tmp->flags&RTF_GATEWAY) || 595 tmp->target.s_node == addr->s_node)) { 596 *r = tmp->next; 597 dev_put(tmp->dev); 598 kfree(tmp); 599 goto out; 600 } 601 r = &tmp->next; 602 } 603 retval = -ENOENT; 604 out: 605 write_unlock_bh(&atalk_routes_lock); 606 return retval; 607 } 608 609 /* 610 * Called when a device is downed. Just throw away any routes 611 * via it. 612 */ 613 static void atrtr_device_down(struct net_device *dev) 614 { 615 struct atalk_route **r = &atalk_routes; 616 struct atalk_route *tmp; 617 618 write_lock_bh(&atalk_routes_lock); 619 while ((tmp = *r) != NULL) { 620 if (tmp->dev == dev) { 621 *r = tmp->next; 622 dev_put(dev); 623 kfree(tmp); 624 } else 625 r = &tmp->next; 626 } 627 write_unlock_bh(&atalk_routes_lock); 628 629 if (atrtr_default.dev == dev) 630 atrtr_set_default(NULL); 631 } 632 633 /* Actually down the interface */ 634 static inline void atalk_dev_down(struct net_device *dev) 635 { 636 atrtr_device_down(dev); /* Remove all routes for the device */ 637 aarp_device_down(dev); /* Remove AARP entries for the device */ 638 atif_drop_device(dev); /* Remove the device */ 639 } 640 641 /* 642 * A device event has occurred. Watch for devices going down and 643 * delete our use of them (iface and route). 644 */ 645 static int ddp_device_event(struct notifier_block *this, unsigned long event, 646 void *ptr) 647 { 648 struct net_device *dev = ptr; 649 650 if (!net_eq(dev_net(dev), &init_net)) 651 return NOTIFY_DONE; 652 653 if (event == NETDEV_DOWN) 654 /* Discard any use of this */ 655 atalk_dev_down(dev); 656 657 return NOTIFY_DONE; 658 } 659 660 /* ioctl calls. Shouldn't even need touching */ 661 /* Device configuration ioctl calls */ 662 static int atif_ioctl(int cmd, void __user *arg) 663 { 664 static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF }; 665 struct ifreq atreq; 666 struct atalk_netrange *nr; 667 struct sockaddr_at *sa; 668 struct net_device *dev; 669 struct atalk_iface *atif; 670 int ct; 671 int limit; 672 struct rtentry rtdef; 673 int add_route; 674 675 if (copy_from_user(&atreq, arg, sizeof(atreq))) 676 return -EFAULT; 677 678 dev = __dev_get_by_name(&init_net, atreq.ifr_name); 679 if (!dev) 680 return -ENODEV; 681 682 sa = (struct sockaddr_at *)&atreq.ifr_addr; 683 atif = atalk_find_dev(dev); 684 685 switch (cmd) { 686 case SIOCSIFADDR: 687 if (!capable(CAP_NET_ADMIN)) 688 return -EPERM; 689 if (sa->sat_family != AF_APPLETALK) 690 return -EINVAL; 691 if (dev->type != ARPHRD_ETHER && 692 dev->type != ARPHRD_LOOPBACK && 693 dev->type != ARPHRD_LOCALTLK && 694 dev->type != ARPHRD_PPP) 695 return -EPROTONOSUPPORT; 696 697 nr = (struct atalk_netrange *)&sa->sat_zero[0]; 698 add_route = 1; 699 700 /* 701 * if this is a point-to-point iface, and we already 702 * have an iface for this AppleTalk address, then we 703 * should not add a route 704 */ 705 if ((dev->flags & IFF_POINTOPOINT) && 706 atalk_find_interface(sa->sat_addr.s_net, 707 sa->sat_addr.s_node)) { 708 printk(KERN_DEBUG "AppleTalk: point-to-point " 709 "interface added with " 710 "existing address\n"); 711 add_route = 0; 712 } 713 714 /* 715 * Phase 1 is fine on LocalTalk but we don't do 716 * EtherTalk phase 1. Anyone wanting to add it go ahead. 717 */ 718 if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2) 719 return -EPROTONOSUPPORT; 720 if (sa->sat_addr.s_node == ATADDR_BCAST || 721 sa->sat_addr.s_node == 254) 722 return -EINVAL; 723 if (atif) { 724 /* Already setting address */ 725 if (atif->status & ATIF_PROBE) 726 return -EBUSY; 727 728 atif->address.s_net = sa->sat_addr.s_net; 729 atif->address.s_node = sa->sat_addr.s_node; 730 atrtr_device_down(dev); /* Flush old routes */ 731 } else { 732 atif = atif_add_device(dev, &sa->sat_addr); 733 if (!atif) 734 return -ENOMEM; 735 } 736 atif->nets = *nr; 737 738 /* 739 * Check if the chosen address is used. If so we 740 * error and atalkd will try another. 741 */ 742 743 if (!(dev->flags & IFF_LOOPBACK) && 744 !(dev->flags & IFF_POINTOPOINT) && 745 atif_probe_device(atif) < 0) { 746 atif_drop_device(dev); 747 return -EADDRINUSE; 748 } 749 750 /* Hey it worked - add the direct routes */ 751 sa = (struct sockaddr_at *)&rtdef.rt_gateway; 752 sa->sat_family = AF_APPLETALK; 753 sa->sat_addr.s_net = atif->address.s_net; 754 sa->sat_addr.s_node = atif->address.s_node; 755 sa = (struct sockaddr_at *)&rtdef.rt_dst; 756 rtdef.rt_flags = RTF_UP; 757 sa->sat_family = AF_APPLETALK; 758 sa->sat_addr.s_node = ATADDR_ANYNODE; 759 if (dev->flags & IFF_LOOPBACK || 760 dev->flags & IFF_POINTOPOINT) 761 rtdef.rt_flags |= RTF_HOST; 762 763 /* Routerless initial state */ 764 if (nr->nr_firstnet == htons(0) && 765 nr->nr_lastnet == htons(0xFFFE)) { 766 sa->sat_addr.s_net = atif->address.s_net; 767 atrtr_create(&rtdef, dev); 768 atrtr_set_default(dev); 769 } else { 770 limit = ntohs(nr->nr_lastnet); 771 if (limit - ntohs(nr->nr_firstnet) > 4096) { 772 printk(KERN_WARNING "Too many routes/" 773 "iface.\n"); 774 return -EINVAL; 775 } 776 if (add_route) 777 for (ct = ntohs(nr->nr_firstnet); 778 ct <= limit; ct++) { 779 sa->sat_addr.s_net = htons(ct); 780 atrtr_create(&rtdef, dev); 781 } 782 } 783 dev_mc_add(dev, aarp_mcast, 6, 1); 784 return 0; 785 786 case SIOCGIFADDR: 787 if (!atif) 788 return -EADDRNOTAVAIL; 789 790 sa->sat_family = AF_APPLETALK; 791 sa->sat_addr = atif->address; 792 break; 793 794 case SIOCGIFBRDADDR: 795 if (!atif) 796 return -EADDRNOTAVAIL; 797 798 sa->sat_family = AF_APPLETALK; 799 sa->sat_addr.s_net = atif->address.s_net; 800 sa->sat_addr.s_node = ATADDR_BCAST; 801 break; 802 803 case SIOCATALKDIFADDR: 804 case SIOCDIFADDR: 805 if (!capable(CAP_NET_ADMIN)) 806 return -EPERM; 807 if (sa->sat_family != AF_APPLETALK) 808 return -EINVAL; 809 atalk_dev_down(dev); 810 break; 811 812 case SIOCSARP: 813 if (!capable(CAP_NET_ADMIN)) 814 return -EPERM; 815 if (sa->sat_family != AF_APPLETALK) 816 return -EINVAL; 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(&init_net, 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 struct sk_buff *frag_iter; 942 int i, copy; 943 944 /* checksum stuff in header space */ 945 if ( (copy = start - offset) > 0) { 946 if (copy > len) 947 copy = len; 948 sum = atalk_sum_partial(skb->data + offset, copy, sum); 949 if ( (len -= copy) == 0) 950 return sum; 951 952 offset += copy; 953 } 954 955 /* checksum stuff in frags */ 956 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 957 int end; 958 959 WARN_ON(start > offset + len); 960 961 end = start + skb_shinfo(skb)->frags[i].size; 962 if ((copy = end - offset) > 0) { 963 u8 *vaddr; 964 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 965 966 if (copy > len) 967 copy = len; 968 vaddr = kmap_skb_frag(frag); 969 sum = atalk_sum_partial(vaddr + frag->page_offset + 970 offset - start, copy, sum); 971 kunmap_skb_frag(vaddr); 972 973 if (!(len -= copy)) 974 return sum; 975 offset += copy; 976 } 977 start = end; 978 } 979 980 skb_walk_frags(skb, frag_iter) { 981 int end; 982 983 WARN_ON(start > offset + len); 984 985 end = start + frag_iter->len; 986 if ((copy = end - offset) > 0) { 987 if (copy > len) 988 copy = len; 989 sum = atalk_sum_skb(frag_iter, offset - start, 990 copy, sum); 991 if ((len -= copy) == 0) 992 return sum; 993 offset += copy; 994 } 995 start = end; 996 } 997 998 BUG_ON(len > 0); 999 1000 return sum; 1001 } 1002 1003 static __be16 atalk_checksum(const struct sk_buff *skb, int len) 1004 { 1005 unsigned long sum; 1006 1007 /* skip header 4 bytes */ 1008 sum = atalk_sum_skb(skb, 4, len-4, 0); 1009 1010 /* Use 0xFFFF for 0. 0 itself means none */ 1011 return sum ? htons((unsigned short)sum) : htons(0xFFFF); 1012 } 1013 1014 static struct proto ddp_proto = { 1015 .name = "DDP", 1016 .owner = THIS_MODULE, 1017 .obj_size = sizeof(struct atalk_sock), 1018 }; 1019 1020 /* 1021 * Create a socket. Initialise the socket, blank the addresses 1022 * set the state. 1023 */ 1024 static int atalk_create(struct net *net, struct socket *sock, int protocol) 1025 { 1026 struct sock *sk; 1027 int rc = -ESOCKTNOSUPPORT; 1028 1029 if (net != &init_net) 1030 return -EAFNOSUPPORT; 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(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto); 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(&init_net, "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 = netdev_priv(dev); 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 if (!net_eq(dev_net(dev), &init_net)) 1402 goto freeit; 1403 1404 /* Don't mangle buffer if shared */ 1405 if (!(skb = skb_share_check(skb, GFP_ATOMIC))) 1406 goto out; 1407 1408 /* Size check and make sure header is contiguous */ 1409 if (!pskb_may_pull(skb, sizeof(*ddp))) 1410 goto freeit; 1411 1412 ddp = ddp_hdr(skb); 1413 1414 len_hops = ntohs(ddp->deh_len_hops); 1415 1416 /* Trim buffer in case of stray trailing data */ 1417 origlen = skb->len; 1418 skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023)); 1419 1420 /* 1421 * Size check to see if ddp->deh_len was crap 1422 * (Otherwise we'll detonate most spectacularly 1423 * in the middle of atalk_checksum() or recvmsg()). 1424 */ 1425 if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) { 1426 pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, " 1427 "skb->len=%u)\n", len_hops & 1023, skb->len); 1428 goto freeit; 1429 } 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, len_hops & 1023) != 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, len_hops, 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 if (!net_eq(dev_net(dev), &init_net)) 1490 goto freeit; 1491 1492 /* Expand any short form frames */ 1493 if (skb_mac_header(skb)[2] == 1) { 1494 struct ddpehdr *ddp; 1495 /* Find our address */ 1496 struct atalk_addr *ap = atalk_find_dev_addr(dev); 1497 1498 if (!ap || skb->len < sizeof(__be16) || skb->len > 1023) 1499 goto freeit; 1500 1501 /* Don't mangle buffer if shared */ 1502 if (!(skb = skb_share_check(skb, GFP_ATOMIC))) 1503 return 0; 1504 1505 /* 1506 * The push leaves us with a ddephdr not an shdr, and 1507 * handily the port bytes in the right place preset. 1508 */ 1509 ddp = (struct ddpehdr *) skb_push(skb, sizeof(*ddp) - 4); 1510 1511 /* Now fill in the long header */ 1512 1513 /* 1514 * These two first. The mac overlays the new source/dest 1515 * network information so we MUST copy these before 1516 * we write the network numbers ! 1517 */ 1518 1519 ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */ 1520 ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */ 1521 1522 ddp->deh_dnet = ap->s_net; /* Network number */ 1523 ddp->deh_snet = ap->s_net; 1524 ddp->deh_sum = 0; /* No checksum */ 1525 /* 1526 * Not sure about this bit... 1527 */ 1528 /* Non routable, so force a drop if we slip up later */ 1529 ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10)); 1530 } 1531 skb_reset_transport_header(skb); 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 didn't implement this check */ 1571 if (usat->sat_addr.s_node == ATADDR_BCAST && 1572 !sock_flag(sk, SOCK_BROADCAST)) { 1573 return -EPERM; 1574 } 1575 } else { 1576 if (sk->sk_state != TCP_ESTABLISHED) 1577 return -ENOTCONN; 1578 usat = &local_satalk; 1579 usat->sat_family = AF_APPLETALK; 1580 usat->sat_port = at->dest_port; 1581 usat->sat_addr.s_node = at->dest_node; 1582 usat->sat_addr.s_net = at->dest_net; 1583 } 1584 1585 /* Build a packet */ 1586 SOCK_DEBUG(sk, "SK %p: Got address.\n", sk); 1587 1588 /* For headers */ 1589 size = sizeof(struct ddpehdr) + len + ddp_dl->header_length; 1590 1591 if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) { 1592 rt = atrtr_find(&usat->sat_addr); 1593 } else { 1594 struct atalk_addr at_hint; 1595 1596 at_hint.s_node = 0; 1597 at_hint.s_net = at->src_net; 1598 1599 rt = atrtr_find(&at_hint); 1600 } 1601 if (!rt) 1602 return -ENETUNREACH; 1603 1604 dev = rt->dev; 1605 1606 SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n", 1607 sk, size, dev->name); 1608 1609 size += dev->hard_header_len; 1610 skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err); 1611 if (!skb) 1612 return err; 1613 1614 skb->sk = sk; 1615 skb_reserve(skb, ddp_dl->header_length); 1616 skb_reserve(skb, dev->hard_header_len); 1617 skb->dev = dev; 1618 1619 SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk); 1620 1621 ddp = (struct ddpehdr *)skb_put(skb, sizeof(struct ddpehdr)); 1622 ddp->deh_len_hops = htons(len + sizeof(*ddp)); 1623 ddp->deh_dnet = usat->sat_addr.s_net; 1624 ddp->deh_snet = at->src_net; 1625 ddp->deh_dnode = usat->sat_addr.s_node; 1626 ddp->deh_snode = at->src_node; 1627 ddp->deh_dport = usat->sat_port; 1628 ddp->deh_sport = at->src_port; 1629 1630 SOCK_DEBUG(sk, "SK %p: Copy user data (%Zd bytes).\n", sk, len); 1631 1632 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); 1633 if (err) { 1634 kfree_skb(skb); 1635 return -EFAULT; 1636 } 1637 1638 if (sk->sk_no_check == 1) 1639 ddp->deh_sum = 0; 1640 else 1641 ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp)); 1642 1643 /* 1644 * Loopback broadcast packets to non gateway targets (ie routes 1645 * to group we are in) 1646 */ 1647 if (ddp->deh_dnode == ATADDR_BCAST && 1648 !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) { 1649 struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL); 1650 1651 if (skb2) { 1652 loopback = 1; 1653 SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk); 1654 if (aarp_send_ddp(dev, skb2, 1655 &usat->sat_addr, NULL) == -1) 1656 kfree_skb(skb2); 1657 /* else queued/sent above in the aarp queue */ 1658 } 1659 } 1660 1661 if (dev->flags & IFF_LOOPBACK || loopback) { 1662 SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk); 1663 /* loop back */ 1664 skb_orphan(skb); 1665 if (ddp->deh_dnode == ATADDR_BCAST) { 1666 struct atalk_addr at_lo; 1667 1668 at_lo.s_node = 0; 1669 at_lo.s_net = 0; 1670 1671 rt = atrtr_find(&at_lo); 1672 if (!rt) { 1673 kfree_skb(skb); 1674 return -ENETUNREACH; 1675 } 1676 dev = rt->dev; 1677 skb->dev = dev; 1678 } 1679 ddp_dl->request(ddp_dl, skb, dev->dev_addr); 1680 } else { 1681 SOCK_DEBUG(sk, "SK %p: send out.\n", sk); 1682 if (rt->flags & RTF_GATEWAY) { 1683 gsat.sat_addr = rt->gateway; 1684 usat = &gsat; 1685 } 1686 1687 if (aarp_send_ddp(dev, skb, &usat->sat_addr, NULL) == -1) 1688 kfree_skb(skb); 1689 /* else queued/sent above in the aarp queue */ 1690 } 1691 SOCK_DEBUG(sk, "SK %p: Done write (%Zd).\n", sk, len); 1692 1693 return len; 1694 } 1695 1696 static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 1697 size_t size, int flags) 1698 { 1699 struct sock *sk = sock->sk; 1700 struct sockaddr_at *sat = (struct sockaddr_at *)msg->msg_name; 1701 struct ddpehdr *ddp; 1702 int copied = 0; 1703 int offset = 0; 1704 int err = 0; 1705 struct sk_buff *skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1706 flags & MSG_DONTWAIT, &err); 1707 if (!skb) 1708 return err; 1709 1710 /* FIXME: use skb->cb to be able to use shared skbs */ 1711 ddp = ddp_hdr(skb); 1712 copied = ntohs(ddp->deh_len_hops) & 1023; 1713 1714 if (sk->sk_type != SOCK_RAW) { 1715 offset = sizeof(*ddp); 1716 copied -= offset; 1717 } 1718 1719 if (copied > size) { 1720 copied = size; 1721 msg->msg_flags |= MSG_TRUNC; 1722 } 1723 err = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copied); 1724 1725 if (!err) { 1726 if (sat) { 1727 sat->sat_family = AF_APPLETALK; 1728 sat->sat_port = ddp->deh_sport; 1729 sat->sat_addr.s_node = ddp->deh_snode; 1730 sat->sat_addr.s_net = ddp->deh_snet; 1731 } 1732 msg->msg_namelen = sizeof(*sat); 1733 } 1734 1735 skb_free_datagram(sk, skb); /* Free the datagram. */ 1736 return err ? : copied; 1737 } 1738 1739 1740 /* 1741 * AppleTalk ioctl calls. 1742 */ 1743 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1744 { 1745 int rc = -ENOIOCTLCMD; 1746 struct sock *sk = sock->sk; 1747 void __user *argp = (void __user *)arg; 1748 1749 switch (cmd) { 1750 /* Protocol layer */ 1751 case TIOCOUTQ: { 1752 long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1753 1754 if (amount < 0) 1755 amount = 0; 1756 rc = put_user(amount, (int __user *)argp); 1757 break; 1758 } 1759 case TIOCINQ: { 1760 /* 1761 * These two are safe on a single CPU system as only 1762 * user tasks fiddle here 1763 */ 1764 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); 1765 long amount = 0; 1766 1767 if (skb) 1768 amount = skb->len - sizeof(struct ddpehdr); 1769 rc = put_user(amount, (int __user *)argp); 1770 break; 1771 } 1772 case SIOCGSTAMP: 1773 rc = sock_get_timestamp(sk, argp); 1774 break; 1775 case SIOCGSTAMPNS: 1776 rc = sock_get_timestampns(sk, argp); 1777 break; 1778 /* Routing */ 1779 case SIOCADDRT: 1780 case SIOCDELRT: 1781 rc = -EPERM; 1782 if (capable(CAP_NET_ADMIN)) 1783 rc = atrtr_ioctl(cmd, argp); 1784 break; 1785 /* Interface */ 1786 case SIOCGIFADDR: 1787 case SIOCSIFADDR: 1788 case SIOCGIFBRDADDR: 1789 case SIOCATALKDIFADDR: 1790 case SIOCDIFADDR: 1791 case SIOCSARP: /* proxy AARP */ 1792 case SIOCDARP: /* proxy AARP */ 1793 rtnl_lock(); 1794 rc = atif_ioctl(cmd, argp); 1795 rtnl_unlock(); 1796 break; 1797 } 1798 1799 return rc; 1800 } 1801 1802 1803 #ifdef CONFIG_COMPAT 1804 static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1805 { 1806 /* 1807 * All Appletalk ioctls except SIOCATALKDIFADDR are standard. And 1808 * SIOCATALKDIFADDR is handled by upper layer as well, so there is 1809 * nothing to do. Eventually SIOCATALKDIFADDR should be moved 1810 * here so there is no generic SIOCPROTOPRIVATE translation in the 1811 * system. 1812 */ 1813 return -ENOIOCTLCMD; 1814 } 1815 #endif 1816 1817 1818 static struct net_proto_family atalk_family_ops = { 1819 .family = PF_APPLETALK, 1820 .create = atalk_create, 1821 .owner = THIS_MODULE, 1822 }; 1823 1824 static const struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = { 1825 .family = PF_APPLETALK, 1826 .owner = THIS_MODULE, 1827 .release = atalk_release, 1828 .bind = atalk_bind, 1829 .connect = atalk_connect, 1830 .socketpair = sock_no_socketpair, 1831 .accept = sock_no_accept, 1832 .getname = atalk_getname, 1833 .poll = datagram_poll, 1834 .ioctl = atalk_ioctl, 1835 #ifdef CONFIG_COMPAT 1836 .compat_ioctl = atalk_compat_ioctl, 1837 #endif 1838 .listen = sock_no_listen, 1839 .shutdown = sock_no_shutdown, 1840 .setsockopt = sock_no_setsockopt, 1841 .getsockopt = sock_no_getsockopt, 1842 .sendmsg = atalk_sendmsg, 1843 .recvmsg = atalk_recvmsg, 1844 .mmap = sock_no_mmap, 1845 .sendpage = sock_no_sendpage, 1846 }; 1847 1848 SOCKOPS_WRAP(atalk_dgram, PF_APPLETALK); 1849 1850 static struct notifier_block ddp_notifier = { 1851 .notifier_call = ddp_device_event, 1852 }; 1853 1854 static struct packet_type ltalk_packet_type __read_mostly = { 1855 .type = cpu_to_be16(ETH_P_LOCALTALK), 1856 .func = ltalk_rcv, 1857 }; 1858 1859 static struct packet_type ppptalk_packet_type __read_mostly = { 1860 .type = cpu_to_be16(ETH_P_PPPTALK), 1861 .func = atalk_rcv, 1862 }; 1863 1864 static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B }; 1865 1866 /* Export symbols for use by drivers when AppleTalk is a module */ 1867 EXPORT_SYMBOL(aarp_send_ddp); 1868 EXPORT_SYMBOL(atrtr_get_dev); 1869 EXPORT_SYMBOL(atalk_find_dev_addr); 1870 1871 static const char atalk_err_snap[] __initconst = 1872 KERN_CRIT "Unable to register DDP with SNAP.\n"; 1873 1874 /* Called by proto.c on kernel start up */ 1875 static int __init atalk_init(void) 1876 { 1877 int rc = proto_register(&ddp_proto, 0); 1878 1879 if (rc != 0) 1880 goto out; 1881 1882 (void)sock_register(&atalk_family_ops); 1883 ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv); 1884 if (!ddp_dl) 1885 printk(atalk_err_snap); 1886 1887 dev_add_pack(<alk_packet_type); 1888 dev_add_pack(&ppptalk_packet_type); 1889 1890 register_netdevice_notifier(&ddp_notifier); 1891 aarp_proto_init(); 1892 atalk_proc_init(); 1893 atalk_register_sysctl(); 1894 out: 1895 return rc; 1896 } 1897 module_init(atalk_init); 1898 1899 /* 1900 * No explicit module reference count manipulation is needed in the 1901 * protocol. Socket layer sets module reference count for us 1902 * and interfaces reference counting is done 1903 * by the network device layer. 1904 * 1905 * Ergo, before the AppleTalk module can be removed, all AppleTalk 1906 * sockets be closed from user space. 1907 */ 1908 static void __exit atalk_exit(void) 1909 { 1910 #ifdef CONFIG_SYSCTL 1911 atalk_unregister_sysctl(); 1912 #endif /* CONFIG_SYSCTL */ 1913 atalk_proc_exit(); 1914 aarp_cleanup_module(); /* General aarp clean-up. */ 1915 unregister_netdevice_notifier(&ddp_notifier); 1916 dev_remove_pack(<alk_packet_type); 1917 dev_remove_pack(&ppptalk_packet_type); 1918 unregister_snap_client(ddp_dl); 1919 sock_unregister(PF_APPLETALK); 1920 proto_unregister(&ddp_proto); 1921 } 1922 module_exit(atalk_exit); 1923 1924 MODULE_LICENSE("GPL"); 1925 MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>"); 1926 MODULE_DESCRIPTION("AppleTalk 0.20\n"); 1927 MODULE_ALIAS_NETPROTO(PF_APPLETALK); 1928