Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * Implements an IPX socket layer. |
| 3 | * |
| 4 | * This code is derived from work by |
| 5 | * Ross Biro : Writing the original IP stack |
| 6 | * Fred Van Kempen : Tidying up the TCP/IP |
| 7 | * |
| 8 | * Many thanks go to Keith Baker, Institute For Industrial Information |
| 9 | * Technology Ltd, Swansea University for allowing me to work on this |
| 10 | * in my own time even though it was in some ways related to commercial |
| 11 | * work I am currently employed to do there. |
| 12 | * |
| 13 | * All the material in this file is subject to the Gnu license version 2. |
| 14 | * Neither Alan Cox nor the Swansea University Computer Society admit |
| 15 | * liability nor provide warranty for any of this software. This material |
| 16 | * is provided as is and at no charge. |
| 17 | * |
| 18 | * Portions Copyright (c) 2000-2003 Conectiva, Inc. <acme@conectiva.com.br> |
| 19 | * Neither Arnaldo Carvalho de Melo nor Conectiva, Inc. admit liability nor |
| 20 | * provide warranty for any of this software. This material is provided |
| 21 | * "AS-IS" and at no charge. |
| 22 | * |
| 23 | * Portions Copyright (c) 1995 Caldera, Inc. <greg@caldera.com> |
| 24 | * Neither Greg Page nor Caldera, Inc. admit liability nor provide |
| 25 | * warranty for any of this software. This material is provided |
| 26 | * "AS-IS" and at no charge. |
| 27 | * |
| 28 | * See net/ipx/ChangeLog. |
| 29 | */ |
| 30 | |
| 31 | #include <linux/capability.h> |
| 32 | #include <linux/errno.h> |
| 33 | #include <linux/if_arp.h> |
| 34 | #include <linux/if_ether.h> |
| 35 | #include <linux/init.h> |
| 36 | #include <linux/ipx.h> |
| 37 | #include <linux/kernel.h> |
| 38 | #include <linux/list.h> |
| 39 | #include <linux/module.h> |
| 40 | #include <linux/net.h> |
| 41 | #include <linux/netdevice.h> |
| 42 | #include <linux/uio.h> |
| 43 | #include <linux/slab.h> |
| 44 | #include <linux/skbuff.h> |
| 45 | #include <linux/socket.h> |
| 46 | #include <linux/sockios.h> |
| 47 | #include <linux/string.h> |
| 48 | #include <linux/types.h> |
| 49 | #include <linux/termios.h> |
| 50 | |
| 51 | #include <net/ipx.h> |
| 52 | #include <net/p8022.h> |
| 53 | #include <net/psnap.h> |
| 54 | #include <net/sock.h> |
| 55 | #include <net/datalink.h> |
| 56 | #include <net/tcp_states.h> |
| 57 | #include <net/net_namespace.h> |
| 58 | |
| 59 | #include <asm/uaccess.h> |
| 60 | |
| 61 | /* Configuration Variables */ |
| 62 | static unsigned char ipxcfg_max_hops = 16; |
| 63 | static char ipxcfg_auto_select_primary; |
| 64 | static char ipxcfg_auto_create_interfaces; |
| 65 | int sysctl_ipx_pprop_broadcasting = 1; |
| 66 | |
| 67 | /* Global Variables */ |
| 68 | static struct datalink_proto *p8022_datalink; |
| 69 | static struct datalink_proto *pEII_datalink; |
| 70 | static struct datalink_proto *p8023_datalink; |
| 71 | static struct datalink_proto *pSNAP_datalink; |
| 72 | |
| 73 | static const struct proto_ops ipx_dgram_ops; |
| 74 | |
| 75 | LIST_HEAD(ipx_interfaces); |
| 76 | DEFINE_SPINLOCK(ipx_interfaces_lock); |
| 77 | |
| 78 | struct ipx_interface *ipx_primary_net; |
| 79 | struct ipx_interface *ipx_internal_net; |
| 80 | |
| 81 | struct ipx_interface *ipx_interfaces_head(void) |
| 82 | { |
| 83 | struct ipx_interface *rc = NULL; |
| 84 | |
| 85 | if (!list_empty(&ipx_interfaces)) |
| 86 | rc = list_entry(ipx_interfaces.next, |
| 87 | struct ipx_interface, node); |
| 88 | return rc; |
| 89 | } |
| 90 | |
| 91 | static void ipxcfg_set_auto_select(char val) |
| 92 | { |
| 93 | ipxcfg_auto_select_primary = val; |
| 94 | if (val && !ipx_primary_net) |
| 95 | ipx_primary_net = ipx_interfaces_head(); |
| 96 | } |
| 97 | |
| 98 | static int ipxcfg_get_config_data(struct ipx_config_data __user *arg) |
| 99 | { |
| 100 | struct ipx_config_data vals; |
| 101 | |
| 102 | vals.ipxcfg_auto_create_interfaces = ipxcfg_auto_create_interfaces; |
| 103 | vals.ipxcfg_auto_select_primary = ipxcfg_auto_select_primary; |
| 104 | |
| 105 | return copy_to_user(arg, &vals, sizeof(vals)) ? -EFAULT : 0; |
| 106 | } |
| 107 | |
| 108 | /* |
| 109 | * Note: Sockets may not be removed _during_ an interrupt or inet_bh |
| 110 | * handler using this technique. They can be added although we do not |
| 111 | * use this facility. |
| 112 | */ |
| 113 | |
| 114 | static void ipx_remove_socket(struct sock *sk) |
| 115 | { |
| 116 | /* Determine interface with which socket is associated */ |
| 117 | struct ipx_interface *intrfc = ipx_sk(sk)->intrfc; |
| 118 | |
| 119 | if (!intrfc) |
| 120 | goto out; |
| 121 | |
| 122 | ipxitf_hold(intrfc); |
| 123 | spin_lock_bh(&intrfc->if_sklist_lock); |
| 124 | sk_del_node_init(sk); |
| 125 | spin_unlock_bh(&intrfc->if_sklist_lock); |
| 126 | ipxitf_put(intrfc); |
| 127 | out: |
| 128 | return; |
| 129 | } |
| 130 | |
| 131 | static void ipx_destroy_socket(struct sock *sk) |
| 132 | { |
| 133 | ipx_remove_socket(sk); |
| 134 | skb_queue_purge(&sk->sk_receive_queue); |
| 135 | sk_refcnt_debug_dec(sk); |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * The following code is used to support IPX Interfaces (IPXITF). An |
| 140 | * IPX interface is defined by a physical device and a frame type. |
| 141 | */ |
| 142 | |
| 143 | /* ipxitf_clear_primary_net has to be called with ipx_interfaces_lock held */ |
| 144 | |
| 145 | static void ipxitf_clear_primary_net(void) |
| 146 | { |
| 147 | ipx_primary_net = NULL; |
| 148 | if (ipxcfg_auto_select_primary) |
| 149 | ipx_primary_net = ipx_interfaces_head(); |
| 150 | } |
| 151 | |
| 152 | static struct ipx_interface *__ipxitf_find_using_phys(struct net_device *dev, |
| 153 | __be16 datalink) |
| 154 | { |
| 155 | struct ipx_interface *i; |
| 156 | |
| 157 | list_for_each_entry(i, &ipx_interfaces, node) |
| 158 | if (i->if_dev == dev && i->if_dlink_type == datalink) |
| 159 | goto out; |
| 160 | i = NULL; |
| 161 | out: |
| 162 | return i; |
| 163 | } |
| 164 | |
| 165 | static struct ipx_interface *ipxitf_find_using_phys(struct net_device *dev, |
| 166 | __be16 datalink) |
| 167 | { |
| 168 | struct ipx_interface *i; |
| 169 | |
| 170 | spin_lock_bh(&ipx_interfaces_lock); |
| 171 | i = __ipxitf_find_using_phys(dev, datalink); |
| 172 | if (i) |
| 173 | ipxitf_hold(i); |
| 174 | spin_unlock_bh(&ipx_interfaces_lock); |
| 175 | return i; |
| 176 | } |
| 177 | |
| 178 | struct ipx_interface *ipxitf_find_using_net(__be32 net) |
| 179 | { |
| 180 | struct ipx_interface *i; |
| 181 | |
| 182 | spin_lock_bh(&ipx_interfaces_lock); |
| 183 | if (net) { |
| 184 | list_for_each_entry(i, &ipx_interfaces, node) |
| 185 | if (i->if_netnum == net) |
| 186 | goto hold; |
| 187 | i = NULL; |
| 188 | goto unlock; |
| 189 | } |
| 190 | |
| 191 | i = ipx_primary_net; |
| 192 | if (i) |
| 193 | hold: |
| 194 | ipxitf_hold(i); |
| 195 | unlock: |
| 196 | spin_unlock_bh(&ipx_interfaces_lock); |
| 197 | return i; |
| 198 | } |
| 199 | |
| 200 | /* Sockets are bound to a particular IPX interface. */ |
| 201 | static void ipxitf_insert_socket(struct ipx_interface *intrfc, struct sock *sk) |
| 202 | { |
| 203 | ipxitf_hold(intrfc); |
| 204 | spin_lock_bh(&intrfc->if_sklist_lock); |
| 205 | ipx_sk(sk)->intrfc = intrfc; |
| 206 | sk_add_node(sk, &intrfc->if_sklist); |
| 207 | spin_unlock_bh(&intrfc->if_sklist_lock); |
| 208 | ipxitf_put(intrfc); |
| 209 | } |
| 210 | |
| 211 | /* caller must hold intrfc->if_sklist_lock */ |
| 212 | static struct sock *__ipxitf_find_socket(struct ipx_interface *intrfc, |
| 213 | __be16 port) |
| 214 | { |
| 215 | struct sock *s; |
| 216 | |
| 217 | sk_for_each(s, &intrfc->if_sklist) |
| 218 | if (ipx_sk(s)->port == port) |
| 219 | goto found; |
| 220 | s = NULL; |
| 221 | found: |
| 222 | return s; |
| 223 | } |
| 224 | |
| 225 | /* caller must hold a reference to intrfc */ |
| 226 | static struct sock *ipxitf_find_socket(struct ipx_interface *intrfc, |
| 227 | __be16 port) |
| 228 | { |
| 229 | struct sock *s; |
| 230 | |
| 231 | spin_lock_bh(&intrfc->if_sklist_lock); |
| 232 | s = __ipxitf_find_socket(intrfc, port); |
| 233 | if (s) |
| 234 | sock_hold(s); |
| 235 | spin_unlock_bh(&intrfc->if_sklist_lock); |
| 236 | |
| 237 | return s; |
| 238 | } |
| 239 | |
| 240 | #ifdef CONFIG_IPX_INTERN |
| 241 | static struct sock *ipxitf_find_internal_socket(struct ipx_interface *intrfc, |
| 242 | unsigned char *ipx_node, |
| 243 | __be16 port) |
| 244 | { |
| 245 | struct sock *s; |
| 246 | |
| 247 | ipxitf_hold(intrfc); |
| 248 | spin_lock_bh(&intrfc->if_sklist_lock); |
| 249 | |
| 250 | sk_for_each(s, &intrfc->if_sklist) { |
| 251 | struct ipx_sock *ipxs = ipx_sk(s); |
| 252 | |
| 253 | if (ipxs->port == port && |
| 254 | !memcmp(ipx_node, ipxs->node, IPX_NODE_LEN)) |
| 255 | goto found; |
| 256 | } |
| 257 | s = NULL; |
| 258 | found: |
| 259 | spin_unlock_bh(&intrfc->if_sklist_lock); |
| 260 | ipxitf_put(intrfc); |
| 261 | return s; |
| 262 | } |
| 263 | #endif |
| 264 | |
| 265 | static void __ipxitf_down(struct ipx_interface *intrfc) |
| 266 | { |
| 267 | struct sock *s; |
| 268 | struct hlist_node *t; |
| 269 | |
| 270 | /* Delete all routes associated with this interface */ |
| 271 | ipxrtr_del_routes(intrfc); |
| 272 | |
| 273 | spin_lock_bh(&intrfc->if_sklist_lock); |
| 274 | /* error sockets */ |
| 275 | sk_for_each_safe(s, t, &intrfc->if_sklist) { |
| 276 | struct ipx_sock *ipxs = ipx_sk(s); |
| 277 | |
| 278 | s->sk_err = ENOLINK; |
| 279 | s->sk_error_report(s); |
| 280 | ipxs->intrfc = NULL; |
| 281 | ipxs->port = 0; |
| 282 | sock_set_flag(s, SOCK_ZAPPED); /* Indicates it is no longer bound */ |
| 283 | sk_del_node_init(s); |
| 284 | } |
| 285 | INIT_HLIST_HEAD(&intrfc->if_sklist); |
| 286 | spin_unlock_bh(&intrfc->if_sklist_lock); |
| 287 | |
| 288 | /* remove this interface from list */ |
| 289 | list_del(&intrfc->node); |
| 290 | |
| 291 | /* remove this interface from *special* networks */ |
| 292 | if (intrfc == ipx_primary_net) |
| 293 | ipxitf_clear_primary_net(); |
| 294 | if (intrfc == ipx_internal_net) |
| 295 | ipx_internal_net = NULL; |
| 296 | |
| 297 | if (intrfc->if_dev) |
| 298 | dev_put(intrfc->if_dev); |
| 299 | kfree(intrfc); |
| 300 | } |
| 301 | |
| 302 | void ipxitf_down(struct ipx_interface *intrfc) |
| 303 | { |
| 304 | spin_lock_bh(&ipx_interfaces_lock); |
| 305 | __ipxitf_down(intrfc); |
| 306 | spin_unlock_bh(&ipx_interfaces_lock); |
| 307 | } |
| 308 | |
| 309 | static void __ipxitf_put(struct ipx_interface *intrfc) |
| 310 | { |
| 311 | if (atomic_dec_and_test(&intrfc->refcnt)) |
| 312 | __ipxitf_down(intrfc); |
| 313 | } |
| 314 | |
| 315 | static int ipxitf_device_event(struct notifier_block *notifier, |
| 316 | unsigned long event, void *ptr) |
| 317 | { |
| 318 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| 319 | struct ipx_interface *i, *tmp; |
| 320 | |
| 321 | if (!net_eq(dev_net(dev), &init_net)) |
| 322 | return NOTIFY_DONE; |
| 323 | |
| 324 | if (event != NETDEV_DOWN && event != NETDEV_UP) |
| 325 | goto out; |
| 326 | |
| 327 | spin_lock_bh(&ipx_interfaces_lock); |
| 328 | list_for_each_entry_safe(i, tmp, &ipx_interfaces, node) |
| 329 | if (i->if_dev == dev) { |
| 330 | if (event == NETDEV_UP) |
| 331 | ipxitf_hold(i); |
| 332 | else |
| 333 | __ipxitf_put(i); |
| 334 | } |
| 335 | spin_unlock_bh(&ipx_interfaces_lock); |
| 336 | out: |
| 337 | return NOTIFY_DONE; |
| 338 | } |
| 339 | |
| 340 | |
| 341 | static __exit void ipxitf_cleanup(void) |
| 342 | { |
| 343 | struct ipx_interface *i, *tmp; |
| 344 | |
| 345 | spin_lock_bh(&ipx_interfaces_lock); |
| 346 | list_for_each_entry_safe(i, tmp, &ipx_interfaces, node) |
| 347 | __ipxitf_put(i); |
| 348 | spin_unlock_bh(&ipx_interfaces_lock); |
| 349 | } |
| 350 | |
| 351 | static void ipxitf_def_skb_handler(struct sock *sock, struct sk_buff *skb) |
| 352 | { |
| 353 | if (sock_queue_rcv_skb(sock, skb) < 0) |
| 354 | kfree_skb(skb); |
| 355 | } |
| 356 | |
| 357 | /* |
| 358 | * On input skb->sk is NULL. Nobody is charged for the memory. |
| 359 | */ |
| 360 | |
| 361 | /* caller must hold a reference to intrfc */ |
| 362 | |
| 363 | #ifdef CONFIG_IPX_INTERN |
| 364 | static int ipxitf_demux_socket(struct ipx_interface *intrfc, |
| 365 | struct sk_buff *skb, int copy) |
| 366 | { |
| 367 | struct ipxhdr *ipx = ipx_hdr(skb); |
| 368 | int is_broadcast = !memcmp(ipx->ipx_dest.node, ipx_broadcast_node, |
| 369 | IPX_NODE_LEN); |
| 370 | struct sock *s; |
| 371 | int rc; |
| 372 | |
| 373 | spin_lock_bh(&intrfc->if_sklist_lock); |
| 374 | |
| 375 | sk_for_each(s, &intrfc->if_sklist) { |
| 376 | struct ipx_sock *ipxs = ipx_sk(s); |
| 377 | |
| 378 | if (ipxs->port == ipx->ipx_dest.sock && |
| 379 | (is_broadcast || !memcmp(ipx->ipx_dest.node, |
| 380 | ipxs->node, IPX_NODE_LEN))) { |
| 381 | /* We found a socket to which to send */ |
| 382 | struct sk_buff *skb1; |
| 383 | |
| 384 | if (copy) { |
| 385 | skb1 = skb_clone(skb, GFP_ATOMIC); |
| 386 | rc = -ENOMEM; |
| 387 | if (!skb1) |
| 388 | goto out; |
| 389 | } else { |
| 390 | skb1 = skb; |
| 391 | copy = 1; /* skb may only be used once */ |
| 392 | } |
| 393 | ipxitf_def_skb_handler(s, skb1); |
| 394 | |
| 395 | /* On an external interface, one socket can listen */ |
| 396 | if (intrfc != ipx_internal_net) |
| 397 | break; |
| 398 | } |
| 399 | } |
| 400 | |
| 401 | /* skb was solely for us, and we did not make a copy, so free it. */ |
| 402 | if (!copy) |
| 403 | kfree_skb(skb); |
| 404 | |
| 405 | rc = 0; |
| 406 | out: |
| 407 | spin_unlock_bh(&intrfc->if_sklist_lock); |
| 408 | return rc; |
| 409 | } |
| 410 | #else |
| 411 | static struct sock *ncp_connection_hack(struct ipx_interface *intrfc, |
| 412 | struct ipxhdr *ipx) |
| 413 | { |
| 414 | /* The packet's target is a NCP connection handler. We want to hand it |
| 415 | * to the correct socket directly within the kernel, so that the |
| 416 | * mars_nwe packet distribution process does not have to do it. Here we |
| 417 | * only care about NCP and BURST packets. |
| 418 | * |
| 419 | * You might call this a hack, but believe me, you do not want a |
| 420 | * complete NCP layer in the kernel, and this is VERY fast as well. */ |
| 421 | struct sock *sk = NULL; |
| 422 | int connection = 0; |
| 423 | u8 *ncphdr = (u8 *)(ipx + 1); |
| 424 | |
| 425 | if (*ncphdr == 0x22 && *(ncphdr + 1) == 0x22) /* NCP request */ |
| 426 | connection = (((int) *(ncphdr + 5)) << 8) | (int) *(ncphdr + 3); |
| 427 | else if (*ncphdr == 0x77 && *(ncphdr + 1) == 0x77) /* BURST packet */ |
| 428 | connection = (((int) *(ncphdr + 9)) << 8) | (int) *(ncphdr + 8); |
| 429 | |
| 430 | if (connection) { |
| 431 | /* Now we have to look for a special NCP connection handling |
| 432 | * socket. Only these sockets have ipx_ncp_conn != 0, set by |
| 433 | * SIOCIPXNCPCONN. */ |
| 434 | spin_lock_bh(&intrfc->if_sklist_lock); |
| 435 | sk_for_each(sk, &intrfc->if_sklist) |
| 436 | if (ipx_sk(sk)->ipx_ncp_conn == connection) { |
| 437 | sock_hold(sk); |
| 438 | goto found; |
| 439 | } |
| 440 | sk = NULL; |
| 441 | found: |
| 442 | spin_unlock_bh(&intrfc->if_sklist_lock); |
| 443 | } |
| 444 | return sk; |
| 445 | } |
| 446 | |
| 447 | static int ipxitf_demux_socket(struct ipx_interface *intrfc, |
| 448 | struct sk_buff *skb, int copy) |
| 449 | { |
| 450 | struct ipxhdr *ipx = ipx_hdr(skb); |
| 451 | struct sock *sock1 = NULL, *sock2 = NULL; |
| 452 | struct sk_buff *skb1 = NULL, *skb2 = NULL; |
| 453 | int rc; |
| 454 | |
| 455 | if (intrfc == ipx_primary_net && ntohs(ipx->ipx_dest.sock) == 0x451) |
| 456 | sock1 = ncp_connection_hack(intrfc, ipx); |
| 457 | if (!sock1) |
| 458 | /* No special socket found, forward the packet the normal way */ |
| 459 | sock1 = ipxitf_find_socket(intrfc, ipx->ipx_dest.sock); |
| 460 | |
| 461 | /* |
| 462 | * We need to check if there is a primary net and if |
| 463 | * this is addressed to one of the *SPECIAL* sockets because |
| 464 | * these need to be propagated to the primary net. |
| 465 | * The *SPECIAL* socket list contains: 0x452(SAP), 0x453(RIP) and |
| 466 | * 0x456(Diagnostic). |
| 467 | */ |
| 468 | |
| 469 | if (ipx_primary_net && intrfc != ipx_primary_net) { |
| 470 | const int dsock = ntohs(ipx->ipx_dest.sock); |
| 471 | |
| 472 | if (dsock == 0x452 || dsock == 0x453 || dsock == 0x456) |
| 473 | /* The appropriate thing to do here is to dup the |
| 474 | * packet and route to the primary net interface via |
| 475 | * ipxitf_send; however, we'll cheat and just demux it |
| 476 | * here. */ |
| 477 | sock2 = ipxitf_find_socket(ipx_primary_net, |
| 478 | ipx->ipx_dest.sock); |
| 479 | } |
| 480 | |
| 481 | /* |
| 482 | * If there is nothing to do return. The kfree will cancel any charging. |
| 483 | */ |
| 484 | rc = 0; |
| 485 | if (!sock1 && !sock2) { |
| 486 | if (!copy) |
| 487 | kfree_skb(skb); |
| 488 | goto out; |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * This next segment of code is a little awkward, but it sets it up |
| 493 | * so that the appropriate number of copies of the SKB are made and |
| 494 | * that skb1 and skb2 point to it (them) so that it (they) can be |
| 495 | * demuxed to sock1 and/or sock2. If we are unable to make enough |
| 496 | * copies, we do as much as is possible. |
| 497 | */ |
| 498 | |
| 499 | if (copy) |
| 500 | skb1 = skb_clone(skb, GFP_ATOMIC); |
| 501 | else |
| 502 | skb1 = skb; |
| 503 | |
| 504 | rc = -ENOMEM; |
| 505 | if (!skb1) |
| 506 | goto out_put; |
| 507 | |
| 508 | /* Do we need 2 SKBs? */ |
| 509 | if (sock1 && sock2) |
| 510 | skb2 = skb_clone(skb1, GFP_ATOMIC); |
| 511 | else |
| 512 | skb2 = skb1; |
| 513 | |
| 514 | if (sock1) |
| 515 | ipxitf_def_skb_handler(sock1, skb1); |
| 516 | |
| 517 | if (!skb2) |
| 518 | goto out_put; |
| 519 | |
| 520 | if (sock2) |
| 521 | ipxitf_def_skb_handler(sock2, skb2); |
| 522 | |
| 523 | rc = 0; |
| 524 | out_put: |
| 525 | if (sock1) |
| 526 | sock_put(sock1); |
| 527 | if (sock2) |
| 528 | sock_put(sock2); |
| 529 | out: |
| 530 | return rc; |
| 531 | } |
| 532 | #endif /* CONFIG_IPX_INTERN */ |
| 533 | |
| 534 | static struct sk_buff *ipxitf_adjust_skbuff(struct ipx_interface *intrfc, |
| 535 | struct sk_buff *skb) |
| 536 | { |
| 537 | struct sk_buff *skb2; |
| 538 | int in_offset = (unsigned char *)ipx_hdr(skb) - skb->head; |
| 539 | int out_offset = intrfc->if_ipx_offset; |
| 540 | int len; |
| 541 | |
| 542 | /* Hopefully, most cases */ |
| 543 | if (in_offset >= out_offset) |
| 544 | return skb; |
| 545 | |
| 546 | /* Need new SKB */ |
| 547 | len = skb->len + out_offset; |
| 548 | skb2 = alloc_skb(len, GFP_ATOMIC); |
| 549 | if (skb2) { |
| 550 | skb_reserve(skb2, out_offset); |
| 551 | skb_reset_network_header(skb2); |
| 552 | skb_reset_transport_header(skb2); |
| 553 | skb_put(skb2, skb->len); |
| 554 | memcpy(ipx_hdr(skb2), ipx_hdr(skb), skb->len); |
| 555 | memcpy(skb2->cb, skb->cb, sizeof(skb->cb)); |
| 556 | } |
| 557 | kfree_skb(skb); |
| 558 | return skb2; |
| 559 | } |
| 560 | |
| 561 | /* caller must hold a reference to intrfc and the skb has to be unshared */ |
| 562 | int ipxitf_send(struct ipx_interface *intrfc, struct sk_buff *skb, char *node) |
| 563 | { |
| 564 | struct ipxhdr *ipx = ipx_hdr(skb); |
| 565 | struct net_device *dev = intrfc->if_dev; |
| 566 | struct datalink_proto *dl = intrfc->if_dlink; |
| 567 | char dest_node[IPX_NODE_LEN]; |
| 568 | int send_to_wire = 1; |
| 569 | int addr_len; |
| 570 | |
| 571 | ipx->ipx_tctrl = IPX_SKB_CB(skb)->ipx_tctrl; |
| 572 | ipx->ipx_dest.net = IPX_SKB_CB(skb)->ipx_dest_net; |
| 573 | ipx->ipx_source.net = IPX_SKB_CB(skb)->ipx_source_net; |
| 574 | |
| 575 | /* see if we need to include the netnum in the route list */ |
| 576 | if (IPX_SKB_CB(skb)->last_hop.index >= 0) { |
| 577 | __be32 *last_hop = (__be32 *)(((u8 *) skb->data) + |
| 578 | sizeof(struct ipxhdr) + |
| 579 | IPX_SKB_CB(skb)->last_hop.index * |
| 580 | sizeof(__be32)); |
| 581 | *last_hop = IPX_SKB_CB(skb)->last_hop.netnum; |
| 582 | IPX_SKB_CB(skb)->last_hop.index = -1; |
| 583 | } |
| 584 | |
| 585 | /* |
| 586 | * We need to know how many skbuffs it will take to send out this |
| 587 | * packet to avoid unnecessary copies. |
| 588 | */ |
| 589 | |
| 590 | if (!dl || !dev || dev->flags & IFF_LOOPBACK) |
| 591 | send_to_wire = 0; /* No non looped */ |
| 592 | |
| 593 | /* |
| 594 | * See if this should be demuxed to sockets on this interface |
| 595 | * |
| 596 | * We want to ensure the original was eaten or that we only use |
| 597 | * up clones. |
| 598 | */ |
| 599 | |
| 600 | if (ipx->ipx_dest.net == intrfc->if_netnum) { |
| 601 | /* |
| 602 | * To our own node, loop and free the original. |
| 603 | * The internal net will receive on all node address. |
| 604 | */ |
| 605 | if (intrfc == ipx_internal_net || |
| 606 | !memcmp(intrfc->if_node, node, IPX_NODE_LEN)) { |
| 607 | /* Don't charge sender */ |
| 608 | skb_orphan(skb); |
| 609 | |
| 610 | /* Will charge receiver */ |
| 611 | return ipxitf_demux_socket(intrfc, skb, 0); |
| 612 | } |
| 613 | |
| 614 | /* Broadcast, loop and possibly keep to send on. */ |
| 615 | if (!memcmp(ipx_broadcast_node, node, IPX_NODE_LEN)) { |
| 616 | if (!send_to_wire) |
| 617 | skb_orphan(skb); |
| 618 | ipxitf_demux_socket(intrfc, skb, send_to_wire); |
| 619 | if (!send_to_wire) |
| 620 | goto out; |
| 621 | } |
| 622 | } |
| 623 | |
| 624 | /* |
| 625 | * If the originating net is not equal to our net; this is routed |
| 626 | * We are still charging the sender. Which is right - the driver |
| 627 | * free will handle this fairly. |
| 628 | */ |
| 629 | if (ipx->ipx_source.net != intrfc->if_netnum) { |
| 630 | /* |
| 631 | * Unshare the buffer before modifying the count in |
| 632 | * case it's a flood or tcpdump |
| 633 | */ |
| 634 | skb = skb_unshare(skb, GFP_ATOMIC); |
| 635 | if (!skb) |
| 636 | goto out; |
| 637 | if (++ipx->ipx_tctrl > ipxcfg_max_hops) |
| 638 | send_to_wire = 0; |
| 639 | } |
| 640 | |
| 641 | if (!send_to_wire) { |
| 642 | kfree_skb(skb); |
| 643 | goto out; |
| 644 | } |
| 645 | |
| 646 | /* Determine the appropriate hardware address */ |
| 647 | addr_len = dev->addr_len; |
| 648 | if (!memcmp(ipx_broadcast_node, node, IPX_NODE_LEN)) |
| 649 | memcpy(dest_node, dev->broadcast, addr_len); |
| 650 | else |
| 651 | memcpy(dest_node, &(node[IPX_NODE_LEN-addr_len]), addr_len); |
| 652 | |
| 653 | /* Make any compensation for differing physical/data link size */ |
| 654 | skb = ipxitf_adjust_skbuff(intrfc, skb); |
| 655 | if (!skb) |
| 656 | goto out; |
| 657 | |
| 658 | /* set up data link and physical headers */ |
| 659 | skb->dev = dev; |
| 660 | skb->protocol = htons(ETH_P_IPX); |
| 661 | |
| 662 | /* Send it out */ |
| 663 | dl->request(dl, skb, dest_node); |
| 664 | out: |
| 665 | return 0; |
| 666 | } |
| 667 | |
| 668 | static int ipxitf_add_local_route(struct ipx_interface *intrfc) |
| 669 | { |
| 670 | return ipxrtr_add_route(intrfc->if_netnum, intrfc, NULL); |
| 671 | } |
| 672 | |
| 673 | static void ipxitf_discover_netnum(struct ipx_interface *intrfc, |
| 674 | struct sk_buff *skb); |
| 675 | static int ipxitf_pprop(struct ipx_interface *intrfc, struct sk_buff *skb); |
| 676 | |
| 677 | static int ipxitf_rcv(struct ipx_interface *intrfc, struct sk_buff *skb) |
| 678 | { |
| 679 | struct ipxhdr *ipx = ipx_hdr(skb); |
| 680 | int rc = 0; |
| 681 | |
| 682 | ipxitf_hold(intrfc); |
| 683 | |
| 684 | /* See if we should update our network number */ |
| 685 | if (!intrfc->if_netnum) /* net number of intrfc not known yet */ |
| 686 | ipxitf_discover_netnum(intrfc, skb); |
| 687 | |
| 688 | IPX_SKB_CB(skb)->last_hop.index = -1; |
| 689 | if (ipx->ipx_type == IPX_TYPE_PPROP) { |
| 690 | rc = ipxitf_pprop(intrfc, skb); |
| 691 | if (rc) |
| 692 | goto out_free_skb; |
| 693 | } |
| 694 | |
| 695 | /* local processing follows */ |
| 696 | if (!IPX_SKB_CB(skb)->ipx_dest_net) |
| 697 | IPX_SKB_CB(skb)->ipx_dest_net = intrfc->if_netnum; |
| 698 | if (!IPX_SKB_CB(skb)->ipx_source_net) |
| 699 | IPX_SKB_CB(skb)->ipx_source_net = intrfc->if_netnum; |
| 700 | |
| 701 | /* it doesn't make sense to route a pprop packet, there's no meaning |
| 702 | * in the ipx_dest_net for such packets */ |
| 703 | if (ipx->ipx_type != IPX_TYPE_PPROP && |
| 704 | intrfc->if_netnum != IPX_SKB_CB(skb)->ipx_dest_net) { |
| 705 | /* We only route point-to-point packets. */ |
| 706 | if (skb->pkt_type == PACKET_HOST) { |
| 707 | skb = skb_unshare(skb, GFP_ATOMIC); |
| 708 | if (skb) |
| 709 | rc = ipxrtr_route_skb(skb); |
| 710 | goto out_intrfc; |
| 711 | } |
| 712 | |
| 713 | goto out_free_skb; |
| 714 | } |
| 715 | |
| 716 | /* see if we should keep it */ |
| 717 | if (!memcmp(ipx_broadcast_node, ipx->ipx_dest.node, IPX_NODE_LEN) || |
| 718 | !memcmp(intrfc->if_node, ipx->ipx_dest.node, IPX_NODE_LEN)) { |
| 719 | rc = ipxitf_demux_socket(intrfc, skb, 0); |
| 720 | goto out_intrfc; |
| 721 | } |
| 722 | |
| 723 | /* we couldn't pawn it off so unload it */ |
| 724 | out_free_skb: |
| 725 | kfree_skb(skb); |
| 726 | out_intrfc: |
| 727 | ipxitf_put(intrfc); |
| 728 | return rc; |
| 729 | } |
| 730 | |
| 731 | static void ipxitf_discover_netnum(struct ipx_interface *intrfc, |
| 732 | struct sk_buff *skb) |
| 733 | { |
| 734 | const struct ipx_cb *cb = IPX_SKB_CB(skb); |
| 735 | |
| 736 | /* see if this is an intra packet: source_net == dest_net */ |
| 737 | if (cb->ipx_source_net == cb->ipx_dest_net && cb->ipx_source_net) { |
| 738 | struct ipx_interface *i = |
| 739 | ipxitf_find_using_net(cb->ipx_source_net); |
| 740 | /* NB: NetWare servers lie about their hop count so we |
| 741 | * dropped the test based on it. This is the best way |
| 742 | * to determine this is a 0 hop count packet. */ |
| 743 | if (!i) { |
| 744 | intrfc->if_netnum = cb->ipx_source_net; |
| 745 | ipxitf_add_local_route(intrfc); |
| 746 | } else { |
| 747 | printk(KERN_WARNING "IPX: Network number collision " |
| 748 | "%lx\n %s %s and %s %s\n", |
| 749 | (unsigned long) ntohl(cb->ipx_source_net), |
| 750 | ipx_device_name(i), |
| 751 | ipx_frame_name(i->if_dlink_type), |
| 752 | ipx_device_name(intrfc), |
| 753 | ipx_frame_name(intrfc->if_dlink_type)); |
| 754 | ipxitf_put(i); |
| 755 | } |
| 756 | } |
| 757 | } |
| 758 | |
| 759 | /** |
| 760 | * ipxitf_pprop - Process packet propagation IPX packet type 0x14, used for |
| 761 | * NetBIOS broadcasts |
| 762 | * @intrfc: IPX interface receiving this packet |
| 763 | * @skb: Received packet |
| 764 | * |
| 765 | * Checks if packet is valid: if its more than %IPX_MAX_PPROP_HOPS hops or if it |
| 766 | * is smaller than a IPX header + the room for %IPX_MAX_PPROP_HOPS hops we drop |
| 767 | * it, not even processing it locally, if it has exact %IPX_MAX_PPROP_HOPS we |
| 768 | * don't broadcast it, but process it locally. See chapter 5 of Novell's "IPX |
| 769 | * RIP and SAP Router Specification", Part Number 107-000029-001. |
| 770 | * |
| 771 | * If it is valid, check if we have pprop broadcasting enabled by the user, |
| 772 | * if not, just return zero for local processing. |
| 773 | * |
| 774 | * If it is enabled check the packet and don't broadcast it if we have already |
| 775 | * seen this packet. |
| 776 | * |
| 777 | * Broadcast: send it to the interfaces that aren't on the packet visited nets |
| 778 | * array, just after the IPX header. |
| 779 | * |
| 780 | * Returns -EINVAL for invalid packets, so that the calling function drops |
| 781 | * the packet without local processing. 0 if packet is to be locally processed. |
| 782 | */ |
| 783 | static int ipxitf_pprop(struct ipx_interface *intrfc, struct sk_buff *skb) |
| 784 | { |
| 785 | struct ipxhdr *ipx = ipx_hdr(skb); |
| 786 | int i, rc = -EINVAL; |
| 787 | struct ipx_interface *ifcs; |
| 788 | char *c; |
| 789 | __be32 *l; |
| 790 | |
| 791 | /* Illegal packet - too many hops or too short */ |
| 792 | /* We decide to throw it away: no broadcasting, no local processing. |
| 793 | * NetBIOS unaware implementations route them as normal packets - |
| 794 | * tctrl <= 15, any data payload... */ |
| 795 | if (IPX_SKB_CB(skb)->ipx_tctrl > IPX_MAX_PPROP_HOPS || |
| 796 | ntohs(ipx->ipx_pktsize) < sizeof(struct ipxhdr) + |
| 797 | IPX_MAX_PPROP_HOPS * sizeof(u32)) |
| 798 | goto out; |
| 799 | /* are we broadcasting this damn thing? */ |
| 800 | rc = 0; |
| 801 | if (!sysctl_ipx_pprop_broadcasting) |
| 802 | goto out; |
| 803 | /* We do broadcast packet on the IPX_MAX_PPROP_HOPS hop, but we |
| 804 | * process it locally. All previous hops broadcasted it, and process it |
| 805 | * locally. */ |
| 806 | if (IPX_SKB_CB(skb)->ipx_tctrl == IPX_MAX_PPROP_HOPS) |
| 807 | goto out; |
| 808 | |
| 809 | c = ((u8 *) ipx) + sizeof(struct ipxhdr); |
| 810 | l = (__be32 *) c; |
| 811 | |
| 812 | /* Don't broadcast packet if already seen this net */ |
| 813 | for (i = 0; i < IPX_SKB_CB(skb)->ipx_tctrl; i++) |
| 814 | if (*l++ == intrfc->if_netnum) |
| 815 | goto out; |
| 816 | |
| 817 | /* < IPX_MAX_PPROP_HOPS hops && input interface not in list. Save the |
| 818 | * position where we will insert recvd netnum into list, later on, |
| 819 | * in ipxitf_send */ |
| 820 | IPX_SKB_CB(skb)->last_hop.index = i; |
| 821 | IPX_SKB_CB(skb)->last_hop.netnum = intrfc->if_netnum; |
| 822 | /* xmit on all other interfaces... */ |
| 823 | spin_lock_bh(&ipx_interfaces_lock); |
| 824 | list_for_each_entry(ifcs, &ipx_interfaces, node) { |
| 825 | /* Except unconfigured interfaces */ |
| 826 | if (!ifcs->if_netnum) |
| 827 | continue; |
| 828 | |
| 829 | /* That aren't in the list */ |
| 830 | if (ifcs == intrfc) |
| 831 | continue; |
| 832 | l = (__be32 *) c; |
| 833 | /* don't consider the last entry in the packet list, |
| 834 | * it is our netnum, and it is not there yet */ |
| 835 | for (i = 0; i < IPX_SKB_CB(skb)->ipx_tctrl; i++) |
| 836 | if (ifcs->if_netnum == *l++) |
| 837 | break; |
| 838 | if (i == IPX_SKB_CB(skb)->ipx_tctrl) { |
| 839 | struct sk_buff *s = skb_copy(skb, GFP_ATOMIC); |
| 840 | |
| 841 | if (s) { |
| 842 | IPX_SKB_CB(s)->ipx_dest_net = ifcs->if_netnum; |
| 843 | ipxrtr_route_skb(s); |
| 844 | } |
| 845 | } |
| 846 | } |
| 847 | spin_unlock_bh(&ipx_interfaces_lock); |
| 848 | out: |
| 849 | return rc; |
| 850 | } |
| 851 | |
| 852 | static void ipxitf_insert(struct ipx_interface *intrfc) |
| 853 | { |
| 854 | spin_lock_bh(&ipx_interfaces_lock); |
| 855 | list_add_tail(&intrfc->node, &ipx_interfaces); |
| 856 | spin_unlock_bh(&ipx_interfaces_lock); |
| 857 | |
| 858 | if (ipxcfg_auto_select_primary && !ipx_primary_net) |
| 859 | ipx_primary_net = intrfc; |
| 860 | } |
| 861 | |
| 862 | static struct ipx_interface *ipxitf_alloc(struct net_device *dev, __be32 netnum, |
| 863 | __be16 dlink_type, |
| 864 | struct datalink_proto *dlink, |
| 865 | unsigned char internal, |
| 866 | int ipx_offset) |
| 867 | { |
| 868 | struct ipx_interface *intrfc = kmalloc(sizeof(*intrfc), GFP_ATOMIC); |
| 869 | |
| 870 | if (intrfc) { |
| 871 | intrfc->if_dev = dev; |
| 872 | intrfc->if_netnum = netnum; |
| 873 | intrfc->if_dlink_type = dlink_type; |
| 874 | intrfc->if_dlink = dlink; |
| 875 | intrfc->if_internal = internal; |
| 876 | intrfc->if_ipx_offset = ipx_offset; |
| 877 | intrfc->if_sknum = IPX_MIN_EPHEMERAL_SOCKET; |
| 878 | INIT_HLIST_HEAD(&intrfc->if_sklist); |
| 879 | atomic_set(&intrfc->refcnt, 1); |
| 880 | spin_lock_init(&intrfc->if_sklist_lock); |
| 881 | } |
| 882 | |
| 883 | return intrfc; |
| 884 | } |
| 885 | |
| 886 | static int ipxitf_create_internal(struct ipx_interface_definition *idef) |
| 887 | { |
| 888 | struct ipx_interface *intrfc; |
| 889 | int rc = -EEXIST; |
| 890 | |
| 891 | /* Only one primary network allowed */ |
| 892 | if (ipx_primary_net) |
| 893 | goto out; |
| 894 | |
| 895 | /* Must have a valid network number */ |
| 896 | rc = -EADDRNOTAVAIL; |
| 897 | if (!idef->ipx_network) |
| 898 | goto out; |
| 899 | intrfc = ipxitf_find_using_net(idef->ipx_network); |
| 900 | rc = -EADDRINUSE; |
| 901 | if (intrfc) { |
| 902 | ipxitf_put(intrfc); |
| 903 | goto out; |
| 904 | } |
| 905 | intrfc = ipxitf_alloc(NULL, idef->ipx_network, 0, NULL, 1, 0); |
| 906 | rc = -EAGAIN; |
| 907 | if (!intrfc) |
| 908 | goto out; |
| 909 | memcpy((char *)&(intrfc->if_node), idef->ipx_node, IPX_NODE_LEN); |
| 910 | ipx_internal_net = ipx_primary_net = intrfc; |
| 911 | ipxitf_hold(intrfc); |
| 912 | ipxitf_insert(intrfc); |
| 913 | |
| 914 | rc = ipxitf_add_local_route(intrfc); |
| 915 | ipxitf_put(intrfc); |
| 916 | out: |
| 917 | return rc; |
| 918 | } |
| 919 | |
| 920 | static __be16 ipx_map_frame_type(unsigned char type) |
| 921 | { |
| 922 | __be16 rc = 0; |
| 923 | |
| 924 | switch (type) { |
| 925 | case IPX_FRAME_ETHERII: rc = htons(ETH_P_IPX); break; |
| 926 | case IPX_FRAME_8022: rc = htons(ETH_P_802_2); break; |
| 927 | case IPX_FRAME_SNAP: rc = htons(ETH_P_SNAP); break; |
| 928 | case IPX_FRAME_8023: rc = htons(ETH_P_802_3); break; |
| 929 | } |
| 930 | |
| 931 | return rc; |
| 932 | } |
| 933 | |
| 934 | static int ipxitf_create(struct ipx_interface_definition *idef) |
| 935 | { |
| 936 | struct net_device *dev; |
| 937 | __be16 dlink_type = 0; |
| 938 | struct datalink_proto *datalink = NULL; |
| 939 | struct ipx_interface *intrfc; |
| 940 | int rc; |
| 941 | |
| 942 | if (idef->ipx_special == IPX_INTERNAL) { |
| 943 | rc = ipxitf_create_internal(idef); |
| 944 | goto out; |
| 945 | } |
| 946 | |
| 947 | rc = -EEXIST; |
| 948 | if (idef->ipx_special == IPX_PRIMARY && ipx_primary_net) |
| 949 | goto out; |
| 950 | |
| 951 | intrfc = ipxitf_find_using_net(idef->ipx_network); |
| 952 | rc = -EADDRINUSE; |
| 953 | if (idef->ipx_network && intrfc) { |
| 954 | ipxitf_put(intrfc); |
| 955 | goto out; |
| 956 | } |
| 957 | |
| 958 | if (intrfc) |
| 959 | ipxitf_put(intrfc); |
| 960 | |
| 961 | dev = dev_get_by_name(&init_net, idef->ipx_device); |
| 962 | rc = -ENODEV; |
| 963 | if (!dev) |
| 964 | goto out; |
| 965 | |
| 966 | switch (idef->ipx_dlink_type) { |
| 967 | case IPX_FRAME_8022: |
| 968 | dlink_type = htons(ETH_P_802_2); |
| 969 | datalink = p8022_datalink; |
| 970 | break; |
| 971 | case IPX_FRAME_ETHERII: |
| 972 | if (dev->type != ARPHRD_IEEE802) { |
| 973 | dlink_type = htons(ETH_P_IPX); |
| 974 | datalink = pEII_datalink; |
| 975 | break; |
| 976 | } |
| 977 | /* fall through */ |
| 978 | case IPX_FRAME_SNAP: |
| 979 | dlink_type = htons(ETH_P_SNAP); |
| 980 | datalink = pSNAP_datalink; |
| 981 | break; |
| 982 | case IPX_FRAME_8023: |
| 983 | dlink_type = htons(ETH_P_802_3); |
| 984 | datalink = p8023_datalink; |
| 985 | break; |
| 986 | case IPX_FRAME_NONE: |
| 987 | default: |
| 988 | rc = -EPROTONOSUPPORT; |
| 989 | goto out_dev; |
| 990 | } |
| 991 | |
| 992 | rc = -ENETDOWN; |
| 993 | if (!(dev->flags & IFF_UP)) |
| 994 | goto out_dev; |
| 995 | |
| 996 | /* Check addresses are suitable */ |
| 997 | rc = -EINVAL; |
| 998 | if (dev->addr_len > IPX_NODE_LEN) |
| 999 | goto out_dev; |
| 1000 | |
| 1001 | intrfc = ipxitf_find_using_phys(dev, dlink_type); |
| 1002 | if (!intrfc) { |
| 1003 | /* Ok now create */ |
| 1004 | intrfc = ipxitf_alloc(dev, idef->ipx_network, dlink_type, |
| 1005 | datalink, 0, dev->hard_header_len + |
| 1006 | datalink->header_length); |
| 1007 | rc = -EAGAIN; |
| 1008 | if (!intrfc) |
| 1009 | goto out_dev; |
| 1010 | /* Setup primary if necessary */ |
| 1011 | if (idef->ipx_special == IPX_PRIMARY) |
| 1012 | ipx_primary_net = intrfc; |
| 1013 | if (!memcmp(idef->ipx_node, "\000\000\000\000\000\000", |
| 1014 | IPX_NODE_LEN)) { |
| 1015 | memset(intrfc->if_node, 0, IPX_NODE_LEN); |
| 1016 | memcpy(intrfc->if_node + IPX_NODE_LEN - dev->addr_len, |
| 1017 | dev->dev_addr, dev->addr_len); |
| 1018 | } else |
| 1019 | memcpy(intrfc->if_node, idef->ipx_node, IPX_NODE_LEN); |
| 1020 | ipxitf_hold(intrfc); |
| 1021 | ipxitf_insert(intrfc); |
| 1022 | } |
| 1023 | |
| 1024 | |
| 1025 | /* If the network number is known, add a route */ |
| 1026 | rc = 0; |
| 1027 | if (!intrfc->if_netnum) |
| 1028 | goto out_intrfc; |
| 1029 | |
| 1030 | rc = ipxitf_add_local_route(intrfc); |
| 1031 | out_intrfc: |
| 1032 | ipxitf_put(intrfc); |
| 1033 | goto out; |
| 1034 | out_dev: |
| 1035 | dev_put(dev); |
| 1036 | out: |
| 1037 | return rc; |
| 1038 | } |
| 1039 | |
| 1040 | static int ipxitf_delete(struct ipx_interface_definition *idef) |
| 1041 | { |
| 1042 | struct net_device *dev = NULL; |
| 1043 | __be16 dlink_type = 0; |
| 1044 | struct ipx_interface *intrfc; |
| 1045 | int rc = 0; |
| 1046 | |
| 1047 | spin_lock_bh(&ipx_interfaces_lock); |
| 1048 | if (idef->ipx_special == IPX_INTERNAL) { |
| 1049 | if (ipx_internal_net) { |
| 1050 | __ipxitf_put(ipx_internal_net); |
| 1051 | goto out; |
| 1052 | } |
| 1053 | rc = -ENOENT; |
| 1054 | goto out; |
| 1055 | } |
| 1056 | |
| 1057 | dlink_type = ipx_map_frame_type(idef->ipx_dlink_type); |
| 1058 | rc = -EPROTONOSUPPORT; |
| 1059 | if (!dlink_type) |
| 1060 | goto out; |
| 1061 | |
| 1062 | dev = __dev_get_by_name(&init_net, idef->ipx_device); |
| 1063 | rc = -ENODEV; |
| 1064 | if (!dev) |
| 1065 | goto out; |
| 1066 | |
| 1067 | intrfc = __ipxitf_find_using_phys(dev, dlink_type); |
| 1068 | rc = -EINVAL; |
| 1069 | if (!intrfc) |
| 1070 | goto out; |
| 1071 | __ipxitf_put(intrfc); |
| 1072 | |
| 1073 | rc = 0; |
| 1074 | out: |
| 1075 | spin_unlock_bh(&ipx_interfaces_lock); |
| 1076 | return rc; |
| 1077 | } |
| 1078 | |
| 1079 | static struct ipx_interface *ipxitf_auto_create(struct net_device *dev, |
| 1080 | __be16 dlink_type) |
| 1081 | { |
| 1082 | struct ipx_interface *intrfc = NULL; |
| 1083 | struct datalink_proto *datalink; |
| 1084 | |
| 1085 | if (!dev) |
| 1086 | goto out; |
| 1087 | |
| 1088 | /* Check addresses are suitable */ |
| 1089 | if (dev->addr_len > IPX_NODE_LEN) |
| 1090 | goto out; |
| 1091 | |
| 1092 | switch (ntohs(dlink_type)) { |
| 1093 | case ETH_P_IPX: datalink = pEII_datalink; break; |
| 1094 | case ETH_P_802_2: datalink = p8022_datalink; break; |
| 1095 | case ETH_P_SNAP: datalink = pSNAP_datalink; break; |
| 1096 | case ETH_P_802_3: datalink = p8023_datalink; break; |
| 1097 | default: goto out; |
| 1098 | } |
| 1099 | |
| 1100 | intrfc = ipxitf_alloc(dev, 0, dlink_type, datalink, 0, |
| 1101 | dev->hard_header_len + datalink->header_length); |
| 1102 | |
| 1103 | if (intrfc) { |
| 1104 | memset(intrfc->if_node, 0, IPX_NODE_LEN); |
| 1105 | memcpy((char *)&(intrfc->if_node[IPX_NODE_LEN-dev->addr_len]), |
| 1106 | dev->dev_addr, dev->addr_len); |
| 1107 | spin_lock_init(&intrfc->if_sklist_lock); |
| 1108 | atomic_set(&intrfc->refcnt, 1); |
| 1109 | ipxitf_insert(intrfc); |
| 1110 | dev_hold(dev); |
| 1111 | } |
| 1112 | |
| 1113 | out: |
| 1114 | return intrfc; |
| 1115 | } |
| 1116 | |
| 1117 | static int ipxitf_ioctl(unsigned int cmd, void __user *arg) |
| 1118 | { |
| 1119 | int rc = -EINVAL; |
| 1120 | struct ifreq ifr; |
| 1121 | int val; |
| 1122 | |
| 1123 | switch (cmd) { |
| 1124 | case SIOCSIFADDR: { |
| 1125 | struct sockaddr_ipx *sipx; |
| 1126 | struct ipx_interface_definition f; |
| 1127 | |
| 1128 | rc = -EFAULT; |
| 1129 | if (copy_from_user(&ifr, arg, sizeof(ifr))) |
| 1130 | break; |
| 1131 | sipx = (struct sockaddr_ipx *)&ifr.ifr_addr; |
| 1132 | rc = -EINVAL; |
| 1133 | if (sipx->sipx_family != AF_IPX) |
| 1134 | break; |
| 1135 | f.ipx_network = sipx->sipx_network; |
| 1136 | memcpy(f.ipx_device, ifr.ifr_name, |
| 1137 | sizeof(f.ipx_device)); |
| 1138 | memcpy(f.ipx_node, sipx->sipx_node, IPX_NODE_LEN); |
| 1139 | f.ipx_dlink_type = sipx->sipx_type; |
| 1140 | f.ipx_special = sipx->sipx_special; |
| 1141 | |
| 1142 | if (sipx->sipx_action == IPX_DLTITF) |
| 1143 | rc = ipxitf_delete(&f); |
| 1144 | else |
| 1145 | rc = ipxitf_create(&f); |
| 1146 | break; |
| 1147 | } |
| 1148 | case SIOCGIFADDR: { |
| 1149 | struct sockaddr_ipx *sipx; |
| 1150 | struct ipx_interface *ipxif; |
| 1151 | struct net_device *dev; |
| 1152 | |
| 1153 | rc = -EFAULT; |
| 1154 | if (copy_from_user(&ifr, arg, sizeof(ifr))) |
| 1155 | break; |
| 1156 | sipx = (struct sockaddr_ipx *)&ifr.ifr_addr; |
| 1157 | dev = __dev_get_by_name(&init_net, ifr.ifr_name); |
| 1158 | rc = -ENODEV; |
| 1159 | if (!dev) |
| 1160 | break; |
| 1161 | ipxif = ipxitf_find_using_phys(dev, |
| 1162 | ipx_map_frame_type(sipx->sipx_type)); |
| 1163 | rc = -EADDRNOTAVAIL; |
| 1164 | if (!ipxif) |
| 1165 | break; |
| 1166 | |
| 1167 | sipx->sipx_family = AF_IPX; |
| 1168 | sipx->sipx_network = ipxif->if_netnum; |
| 1169 | memcpy(sipx->sipx_node, ipxif->if_node, |
| 1170 | sizeof(sipx->sipx_node)); |
| 1171 | rc = 0; |
| 1172 | if (copy_to_user(arg, &ifr, sizeof(ifr))) |
| 1173 | rc = -EFAULT; |
| 1174 | ipxitf_put(ipxif); |
| 1175 | break; |
| 1176 | } |
| 1177 | case SIOCAIPXITFCRT: |
| 1178 | rc = -EFAULT; |
| 1179 | if (get_user(val, (unsigned char __user *) arg)) |
| 1180 | break; |
| 1181 | rc = 0; |
| 1182 | ipxcfg_auto_create_interfaces = val; |
| 1183 | break; |
| 1184 | case SIOCAIPXPRISLT: |
| 1185 | rc = -EFAULT; |
| 1186 | if (get_user(val, (unsigned char __user *) arg)) |
| 1187 | break; |
| 1188 | rc = 0; |
| 1189 | ipxcfg_set_auto_select(val); |
| 1190 | break; |
| 1191 | } |
| 1192 | |
| 1193 | return rc; |
| 1194 | } |
| 1195 | |
| 1196 | /* |
| 1197 | * Checksum routine for IPX |
| 1198 | */ |
| 1199 | |
| 1200 | /* Note: We assume ipx_tctrl==0 and htons(length)==ipx_pktsize */ |
| 1201 | /* This functions should *not* mess with packet contents */ |
| 1202 | |
| 1203 | __be16 ipx_cksum(struct ipxhdr *packet, int length) |
| 1204 | { |
| 1205 | /* |
| 1206 | * NOTE: sum is a net byte order quantity, which optimizes the |
| 1207 | * loop. This only works on big and little endian machines. (I |
| 1208 | * don't know of a machine that isn't.) |
| 1209 | */ |
| 1210 | /* handle the first 3 words separately; checksum should be skipped |
| 1211 | * and ipx_tctrl masked out */ |
| 1212 | __u16 *p = (__u16 *)packet; |
| 1213 | __u32 sum = p[1] + (p[2] & (__force u16)htons(0x00ff)); |
| 1214 | __u32 i = (length >> 1) - 3; /* Number of remaining complete words */ |
| 1215 | |
| 1216 | /* Loop through them */ |
| 1217 | p += 3; |
| 1218 | while (i--) |
| 1219 | sum += *p++; |
| 1220 | |
| 1221 | /* Add on the last part word if it exists */ |
| 1222 | if (packet->ipx_pktsize & htons(1)) |
| 1223 | sum += (__force u16)htons(0xff00) & *p; |
| 1224 | |
| 1225 | /* Do final fixup */ |
| 1226 | sum = (sum & 0xffff) + (sum >> 16); |
| 1227 | |
| 1228 | /* It's a pity there's no concept of carry in C */ |
| 1229 | if (sum >= 0x10000) |
| 1230 | sum++; |
| 1231 | |
| 1232 | /* |
| 1233 | * Leave 0 alone; we don't want 0xffff here. Note that we can't get |
| 1234 | * here with 0x10000, so this check is the same as ((__u16)sum) |
| 1235 | */ |
| 1236 | if (sum) |
| 1237 | sum = ~sum; |
| 1238 | |
| 1239 | return (__force __be16)sum; |
| 1240 | } |
| 1241 | |
| 1242 | const char *ipx_frame_name(__be16 frame) |
| 1243 | { |
| 1244 | char* rc = "None"; |
| 1245 | |
| 1246 | switch (ntohs(frame)) { |
| 1247 | case ETH_P_IPX: rc = "EtherII"; break; |
| 1248 | case ETH_P_802_2: rc = "802.2"; break; |
| 1249 | case ETH_P_SNAP: rc = "SNAP"; break; |
| 1250 | case ETH_P_802_3: rc = "802.3"; break; |
| 1251 | } |
| 1252 | |
| 1253 | return rc; |
| 1254 | } |
| 1255 | |
| 1256 | const char *ipx_device_name(struct ipx_interface *intrfc) |
| 1257 | { |
| 1258 | return intrfc->if_internal ? "Internal" : |
| 1259 | intrfc->if_dev ? intrfc->if_dev->name : "Unknown"; |
| 1260 | } |
| 1261 | |
| 1262 | /* Handling for system calls applied via the various interfaces to an IPX |
| 1263 | * socket object. */ |
| 1264 | |
| 1265 | static int ipx_setsockopt(struct socket *sock, int level, int optname, |
| 1266 | char __user *optval, unsigned int optlen) |
| 1267 | { |
| 1268 | struct sock *sk = sock->sk; |
| 1269 | int opt; |
| 1270 | int rc = -EINVAL; |
| 1271 | |
| 1272 | lock_sock(sk); |
| 1273 | if (optlen != sizeof(int)) |
| 1274 | goto out; |
| 1275 | |
| 1276 | rc = -EFAULT; |
| 1277 | if (get_user(opt, (unsigned int __user *)optval)) |
| 1278 | goto out; |
| 1279 | |
| 1280 | rc = -ENOPROTOOPT; |
| 1281 | if (!(level == SOL_IPX && optname == IPX_TYPE)) |
| 1282 | goto out; |
| 1283 | |
| 1284 | ipx_sk(sk)->type = opt; |
| 1285 | rc = 0; |
| 1286 | out: |
| 1287 | release_sock(sk); |
| 1288 | return rc; |
| 1289 | } |
| 1290 | |
| 1291 | static int ipx_getsockopt(struct socket *sock, int level, int optname, |
| 1292 | char __user *optval, int __user *optlen) |
| 1293 | { |
| 1294 | struct sock *sk = sock->sk; |
| 1295 | int val = 0; |
| 1296 | int len; |
| 1297 | int rc = -ENOPROTOOPT; |
| 1298 | |
| 1299 | lock_sock(sk); |
| 1300 | if (!(level == SOL_IPX && optname == IPX_TYPE)) |
| 1301 | goto out; |
| 1302 | |
| 1303 | val = ipx_sk(sk)->type; |
| 1304 | |
| 1305 | rc = -EFAULT; |
| 1306 | if (get_user(len, optlen)) |
| 1307 | goto out; |
| 1308 | |
| 1309 | len = min_t(unsigned int, len, sizeof(int)); |
| 1310 | rc = -EINVAL; |
| 1311 | if(len < 0) |
| 1312 | goto out; |
| 1313 | |
| 1314 | rc = -EFAULT; |
| 1315 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
| 1316 | goto out; |
| 1317 | |
| 1318 | rc = 0; |
| 1319 | out: |
| 1320 | release_sock(sk); |
| 1321 | return rc; |
| 1322 | } |
| 1323 | |
| 1324 | static struct proto ipx_proto = { |
| 1325 | .name = "IPX", |
| 1326 | .owner = THIS_MODULE, |
| 1327 | .obj_size = sizeof(struct ipx_sock), |
| 1328 | }; |
| 1329 | |
| 1330 | static int ipx_create(struct net *net, struct socket *sock, int protocol, |
| 1331 | int kern) |
| 1332 | { |
| 1333 | int rc = -ESOCKTNOSUPPORT; |
| 1334 | struct sock *sk; |
| 1335 | |
| 1336 | if (!net_eq(net, &init_net)) |
| 1337 | return -EAFNOSUPPORT; |
| 1338 | |
| 1339 | /* |
| 1340 | * SPX support is not anymore in the kernel sources. If you want to |
| 1341 | * ressurrect it, completing it and making it understand shared skbs, |
| 1342 | * be fully multithreaded, etc, grab the sources in an early 2.5 kernel |
| 1343 | * tree. |
| 1344 | */ |
| 1345 | if (sock->type != SOCK_DGRAM) |
| 1346 | goto out; |
| 1347 | |
| 1348 | rc = -ENOMEM; |
| 1349 | sk = sk_alloc(net, PF_IPX, GFP_KERNEL, &ipx_proto, kern); |
| 1350 | if (!sk) |
| 1351 | goto out; |
| 1352 | |
| 1353 | sk_refcnt_debug_inc(sk); |
| 1354 | sock_init_data(sock, sk); |
| 1355 | sk->sk_no_check_tx = 1; /* Checksum off by default */ |
| 1356 | sock->ops = &ipx_dgram_ops; |
| 1357 | rc = 0; |
| 1358 | out: |
| 1359 | return rc; |
| 1360 | } |
| 1361 | |
| 1362 | static int ipx_release(struct socket *sock) |
| 1363 | { |
| 1364 | struct sock *sk = sock->sk; |
| 1365 | |
| 1366 | if (!sk) |
| 1367 | goto out; |
| 1368 | |
| 1369 | lock_sock(sk); |
| 1370 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 1371 | if (!sock_flag(sk, SOCK_DEAD)) |
| 1372 | sk->sk_state_change(sk); |
| 1373 | |
| 1374 | sock_set_flag(sk, SOCK_DEAD); |
| 1375 | sock->sk = NULL; |
| 1376 | sk_refcnt_debug_release(sk); |
| 1377 | ipx_destroy_socket(sk); |
| 1378 | release_sock(sk); |
| 1379 | sock_put(sk); |
| 1380 | out: |
| 1381 | return 0; |
| 1382 | } |
| 1383 | |
| 1384 | /* caller must hold a reference to intrfc */ |
| 1385 | |
| 1386 | static __be16 ipx_first_free_socketnum(struct ipx_interface *intrfc) |
| 1387 | { |
| 1388 | unsigned short socketNum = intrfc->if_sknum; |
| 1389 | |
| 1390 | spin_lock_bh(&intrfc->if_sklist_lock); |
| 1391 | |
| 1392 | if (socketNum < IPX_MIN_EPHEMERAL_SOCKET) |
| 1393 | socketNum = IPX_MIN_EPHEMERAL_SOCKET; |
| 1394 | |
| 1395 | while (__ipxitf_find_socket(intrfc, htons(socketNum))) |
| 1396 | if (socketNum > IPX_MAX_EPHEMERAL_SOCKET) |
| 1397 | socketNum = IPX_MIN_EPHEMERAL_SOCKET; |
| 1398 | else |
| 1399 | socketNum++; |
| 1400 | |
| 1401 | spin_unlock_bh(&intrfc->if_sklist_lock); |
| 1402 | intrfc->if_sknum = socketNum; |
| 1403 | |
| 1404 | return htons(socketNum); |
| 1405 | } |
| 1406 | |
| 1407 | static int __ipx_bind(struct socket *sock, |
| 1408 | struct sockaddr *uaddr, int addr_len) |
| 1409 | { |
| 1410 | struct sock *sk = sock->sk; |
| 1411 | struct ipx_sock *ipxs = ipx_sk(sk); |
| 1412 | struct ipx_interface *intrfc; |
| 1413 | struct sockaddr_ipx *addr = (struct sockaddr_ipx *)uaddr; |
| 1414 | int rc = -EINVAL; |
| 1415 | |
| 1416 | if (!sock_flag(sk, SOCK_ZAPPED) || addr_len != sizeof(struct sockaddr_ipx)) |
| 1417 | goto out; |
| 1418 | |
| 1419 | intrfc = ipxitf_find_using_net(addr->sipx_network); |
| 1420 | rc = -EADDRNOTAVAIL; |
| 1421 | if (!intrfc) |
| 1422 | goto out; |
| 1423 | |
| 1424 | if (!addr->sipx_port) { |
| 1425 | addr->sipx_port = ipx_first_free_socketnum(intrfc); |
| 1426 | rc = -EINVAL; |
| 1427 | if (!addr->sipx_port) |
| 1428 | goto out_put; |
| 1429 | } |
| 1430 | |
| 1431 | /* protect IPX system stuff like routing/sap */ |
| 1432 | rc = -EACCES; |
| 1433 | if (ntohs(addr->sipx_port) < IPX_MIN_EPHEMERAL_SOCKET && |
| 1434 | !capable(CAP_NET_ADMIN)) |
| 1435 | goto out_put; |
| 1436 | |
| 1437 | ipxs->port = addr->sipx_port; |
| 1438 | |
| 1439 | #ifdef CONFIG_IPX_INTERN |
| 1440 | if (intrfc == ipx_internal_net) { |
| 1441 | /* The source address is to be set explicitly if the |
| 1442 | * socket is to be bound on the internal network. If a |
| 1443 | * node number 0 was specified, the default is used. |
| 1444 | */ |
| 1445 | |
| 1446 | rc = -EINVAL; |
| 1447 | if (!memcmp(addr->sipx_node, ipx_broadcast_node, IPX_NODE_LEN)) |
| 1448 | goto out_put; |
| 1449 | if (!memcmp(addr->sipx_node, ipx_this_node, IPX_NODE_LEN)) |
| 1450 | memcpy(ipxs->node, intrfc->if_node, IPX_NODE_LEN); |
| 1451 | else |
| 1452 | memcpy(ipxs->node, addr->sipx_node, IPX_NODE_LEN); |
| 1453 | |
| 1454 | rc = -EADDRINUSE; |
| 1455 | if (ipxitf_find_internal_socket(intrfc, ipxs->node, |
| 1456 | ipxs->port)) { |
| 1457 | SOCK_DEBUG(sk, |
| 1458 | "IPX: bind failed because port %X in use.\n", |
| 1459 | ntohs(addr->sipx_port)); |
| 1460 | goto out_put; |
| 1461 | } |
| 1462 | } else { |
| 1463 | /* Source addresses are easy. It must be our |
| 1464 | * network:node pair for an interface routed to IPX |
| 1465 | * with the ipx routing ioctl() |
| 1466 | */ |
| 1467 | |
| 1468 | memcpy(ipxs->node, intrfc->if_node, IPX_NODE_LEN); |
| 1469 | |
| 1470 | rc = -EADDRINUSE; |
| 1471 | if (ipxitf_find_socket(intrfc, addr->sipx_port)) { |
| 1472 | SOCK_DEBUG(sk, |
| 1473 | "IPX: bind failed because port %X in use.\n", |
| 1474 | ntohs(addr->sipx_port)); |
| 1475 | goto out_put; |
| 1476 | } |
| 1477 | } |
| 1478 | |
| 1479 | #else /* !def CONFIG_IPX_INTERN */ |
| 1480 | |
| 1481 | /* Source addresses are easy. It must be our network:node pair for |
| 1482 | an interface routed to IPX with the ipx routing ioctl() */ |
| 1483 | |
| 1484 | rc = -EADDRINUSE; |
| 1485 | if (ipxitf_find_socket(intrfc, addr->sipx_port)) { |
| 1486 | SOCK_DEBUG(sk, "IPX: bind failed because port %X in use.\n", |
| 1487 | ntohs((int)addr->sipx_port)); |
| 1488 | goto out_put; |
| 1489 | } |
| 1490 | |
| 1491 | #endif /* CONFIG_IPX_INTERN */ |
| 1492 | |
| 1493 | ipxitf_insert_socket(intrfc, sk); |
| 1494 | sock_reset_flag(sk, SOCK_ZAPPED); |
| 1495 | |
| 1496 | rc = 0; |
| 1497 | out_put: |
| 1498 | ipxitf_put(intrfc); |
| 1499 | out: |
| 1500 | return rc; |
| 1501 | } |
| 1502 | |
| 1503 | static int ipx_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
| 1504 | { |
| 1505 | struct sock *sk = sock->sk; |
| 1506 | int rc; |
| 1507 | |
| 1508 | lock_sock(sk); |
| 1509 | rc = __ipx_bind(sock, uaddr, addr_len); |
| 1510 | release_sock(sk); |
| 1511 | |
| 1512 | return rc; |
| 1513 | } |
| 1514 | |
| 1515 | static int ipx_connect(struct socket *sock, struct sockaddr *uaddr, |
| 1516 | int addr_len, int flags) |
| 1517 | { |
| 1518 | struct sock *sk = sock->sk; |
| 1519 | struct ipx_sock *ipxs = ipx_sk(sk); |
| 1520 | struct sockaddr_ipx *addr; |
| 1521 | int rc = -EINVAL; |
| 1522 | struct ipx_route *rt; |
| 1523 | |
| 1524 | sk->sk_state = TCP_CLOSE; |
| 1525 | sock->state = SS_UNCONNECTED; |
| 1526 | |
| 1527 | lock_sock(sk); |
| 1528 | if (addr_len != sizeof(*addr)) |
| 1529 | goto out; |
| 1530 | addr = (struct sockaddr_ipx *)uaddr; |
| 1531 | |
| 1532 | /* put the autobinding in */ |
| 1533 | if (!ipxs->port) { |
| 1534 | struct sockaddr_ipx uaddr; |
| 1535 | |
| 1536 | uaddr.sipx_port = 0; |
| 1537 | uaddr.sipx_network = 0; |
| 1538 | |
| 1539 | #ifdef CONFIG_IPX_INTERN |
| 1540 | rc = -ENETDOWN; |
| 1541 | if (!ipxs->intrfc) |
| 1542 | goto out; /* Someone zonked the iface */ |
| 1543 | memcpy(uaddr.sipx_node, ipxs->intrfc->if_node, |
| 1544 | IPX_NODE_LEN); |
| 1545 | #endif /* CONFIG_IPX_INTERN */ |
| 1546 | |
| 1547 | rc = __ipx_bind(sock, (struct sockaddr *)&uaddr, |
| 1548 | sizeof(struct sockaddr_ipx)); |
| 1549 | if (rc) |
| 1550 | goto out; |
| 1551 | } |
| 1552 | |
| 1553 | /* We can either connect to primary network or somewhere |
| 1554 | * we can route to */ |
| 1555 | rt = ipxrtr_lookup(addr->sipx_network); |
| 1556 | rc = -ENETUNREACH; |
| 1557 | if (!rt && !(!addr->sipx_network && ipx_primary_net)) |
| 1558 | goto out; |
| 1559 | |
| 1560 | ipxs->dest_addr.net = addr->sipx_network; |
| 1561 | ipxs->dest_addr.sock = addr->sipx_port; |
| 1562 | memcpy(ipxs->dest_addr.node, addr->sipx_node, IPX_NODE_LEN); |
| 1563 | ipxs->type = addr->sipx_type; |
| 1564 | |
| 1565 | if (sock->type == SOCK_DGRAM) { |
| 1566 | sock->state = SS_CONNECTED; |
| 1567 | sk->sk_state = TCP_ESTABLISHED; |
| 1568 | } |
| 1569 | |
| 1570 | if (rt) |
| 1571 | ipxrtr_put(rt); |
| 1572 | rc = 0; |
| 1573 | out: |
| 1574 | release_sock(sk); |
| 1575 | return rc; |
| 1576 | } |
| 1577 | |
| 1578 | |
| 1579 | static int ipx_getname(struct socket *sock, struct sockaddr *uaddr, |
| 1580 | int *uaddr_len, int peer) |
| 1581 | { |
| 1582 | struct ipx_address *addr; |
| 1583 | struct sockaddr_ipx sipx; |
| 1584 | struct sock *sk = sock->sk; |
| 1585 | struct ipx_sock *ipxs = ipx_sk(sk); |
| 1586 | int rc; |
| 1587 | |
| 1588 | *uaddr_len = sizeof(struct sockaddr_ipx); |
| 1589 | |
| 1590 | lock_sock(sk); |
| 1591 | if (peer) { |
| 1592 | rc = -ENOTCONN; |
| 1593 | if (sk->sk_state != TCP_ESTABLISHED) |
| 1594 | goto out; |
| 1595 | |
| 1596 | addr = &ipxs->dest_addr; |
| 1597 | sipx.sipx_network = addr->net; |
| 1598 | sipx.sipx_port = addr->sock; |
| 1599 | memcpy(sipx.sipx_node, addr->node, IPX_NODE_LEN); |
| 1600 | } else { |
| 1601 | if (ipxs->intrfc) { |
| 1602 | sipx.sipx_network = ipxs->intrfc->if_netnum; |
| 1603 | #ifdef CONFIG_IPX_INTERN |
| 1604 | memcpy(sipx.sipx_node, ipxs->node, IPX_NODE_LEN); |
| 1605 | #else |
| 1606 | memcpy(sipx.sipx_node, ipxs->intrfc->if_node, |
| 1607 | IPX_NODE_LEN); |
| 1608 | #endif /* CONFIG_IPX_INTERN */ |
| 1609 | |
| 1610 | } else { |
| 1611 | sipx.sipx_network = 0; |
| 1612 | memset(sipx.sipx_node, '\0', IPX_NODE_LEN); |
| 1613 | } |
| 1614 | |
| 1615 | sipx.sipx_port = ipxs->port; |
| 1616 | } |
| 1617 | |
| 1618 | sipx.sipx_family = AF_IPX; |
| 1619 | sipx.sipx_type = ipxs->type; |
| 1620 | sipx.sipx_zero = 0; |
| 1621 | memcpy(uaddr, &sipx, sizeof(sipx)); |
| 1622 | |
| 1623 | rc = 0; |
| 1624 | out: |
| 1625 | release_sock(sk); |
| 1626 | return rc; |
| 1627 | } |
| 1628 | |
| 1629 | static int ipx_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
| 1630 | { |
| 1631 | /* NULL here for pt means the packet was looped back */ |
| 1632 | struct ipx_interface *intrfc; |
| 1633 | struct ipxhdr *ipx; |
| 1634 | u16 ipx_pktsize; |
| 1635 | int rc = 0; |
| 1636 | |
| 1637 | if (!net_eq(dev_net(dev), &init_net)) |
| 1638 | goto drop; |
| 1639 | |
| 1640 | /* Not ours */ |
| 1641 | if (skb->pkt_type == PACKET_OTHERHOST) |
| 1642 | goto drop; |
| 1643 | |
| 1644 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
| 1645 | goto out; |
| 1646 | |
| 1647 | if (!pskb_may_pull(skb, sizeof(struct ipxhdr))) |
| 1648 | goto drop; |
| 1649 | |
| 1650 | ipx_pktsize = ntohs(ipx_hdr(skb)->ipx_pktsize); |
| 1651 | |
| 1652 | /* Too small or invalid header? */ |
| 1653 | if (ipx_pktsize < sizeof(struct ipxhdr) || |
| 1654 | !pskb_may_pull(skb, ipx_pktsize)) |
| 1655 | goto drop; |
| 1656 | |
| 1657 | ipx = ipx_hdr(skb); |
| 1658 | if (ipx->ipx_checksum != IPX_NO_CHECKSUM && |
| 1659 | ipx->ipx_checksum != ipx_cksum(ipx, ipx_pktsize)) |
| 1660 | goto drop; |
| 1661 | |
| 1662 | IPX_SKB_CB(skb)->ipx_tctrl = ipx->ipx_tctrl; |
| 1663 | IPX_SKB_CB(skb)->ipx_dest_net = ipx->ipx_dest.net; |
| 1664 | IPX_SKB_CB(skb)->ipx_source_net = ipx->ipx_source.net; |
| 1665 | |
| 1666 | /* Determine what local ipx endpoint this is */ |
| 1667 | intrfc = ipxitf_find_using_phys(dev, pt->type); |
| 1668 | if (!intrfc) { |
| 1669 | if (ipxcfg_auto_create_interfaces && |
| 1670 | IPX_SKB_CB(skb)->ipx_dest_net) { |
| 1671 | intrfc = ipxitf_auto_create(dev, pt->type); |
| 1672 | if (intrfc) |
| 1673 | ipxitf_hold(intrfc); |
| 1674 | } |
| 1675 | |
| 1676 | if (!intrfc) /* Not one of ours */ |
| 1677 | /* or invalid packet for auto creation */ |
| 1678 | goto drop; |
| 1679 | } |
| 1680 | |
| 1681 | rc = ipxitf_rcv(intrfc, skb); |
| 1682 | ipxitf_put(intrfc); |
| 1683 | goto out; |
| 1684 | drop: |
| 1685 | kfree_skb(skb); |
| 1686 | out: |
| 1687 | return rc; |
| 1688 | } |
| 1689 | |
| 1690 | static int ipx_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
| 1691 | { |
| 1692 | struct sock *sk = sock->sk; |
| 1693 | struct ipx_sock *ipxs = ipx_sk(sk); |
| 1694 | DECLARE_SOCKADDR(struct sockaddr_ipx *, usipx, msg->msg_name); |
| 1695 | struct sockaddr_ipx local_sipx; |
| 1696 | int rc = -EINVAL; |
| 1697 | int flags = msg->msg_flags; |
| 1698 | |
| 1699 | lock_sock(sk); |
| 1700 | /* Socket gets bound below anyway */ |
| 1701 | /* if (sk->sk_zapped) |
| 1702 | return -EIO; */ /* Socket not bound */ |
| 1703 | if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) |
| 1704 | goto out; |
| 1705 | |
| 1706 | /* Max possible packet size limited by 16 bit pktsize in header */ |
| 1707 | if (len >= 65535 - sizeof(struct ipxhdr)) |
| 1708 | goto out; |
| 1709 | |
| 1710 | if (usipx) { |
| 1711 | if (!ipxs->port) { |
| 1712 | struct sockaddr_ipx uaddr; |
| 1713 | |
| 1714 | uaddr.sipx_port = 0; |
| 1715 | uaddr.sipx_network = 0; |
| 1716 | #ifdef CONFIG_IPX_INTERN |
| 1717 | rc = -ENETDOWN; |
| 1718 | if (!ipxs->intrfc) |
| 1719 | goto out; /* Someone zonked the iface */ |
| 1720 | memcpy(uaddr.sipx_node, ipxs->intrfc->if_node, |
| 1721 | IPX_NODE_LEN); |
| 1722 | #endif |
| 1723 | rc = __ipx_bind(sock, (struct sockaddr *)&uaddr, |
| 1724 | sizeof(struct sockaddr_ipx)); |
| 1725 | if (rc) |
| 1726 | goto out; |
| 1727 | } |
| 1728 | |
| 1729 | rc = -EINVAL; |
| 1730 | if (msg->msg_namelen < sizeof(*usipx) || |
| 1731 | usipx->sipx_family != AF_IPX) |
| 1732 | goto out; |
| 1733 | } else { |
| 1734 | rc = -ENOTCONN; |
| 1735 | if (sk->sk_state != TCP_ESTABLISHED) |
| 1736 | goto out; |
| 1737 | |
| 1738 | usipx = &local_sipx; |
| 1739 | usipx->sipx_family = AF_IPX; |
| 1740 | usipx->sipx_type = ipxs->type; |
| 1741 | usipx->sipx_port = ipxs->dest_addr.sock; |
| 1742 | usipx->sipx_network = ipxs->dest_addr.net; |
| 1743 | memcpy(usipx->sipx_node, ipxs->dest_addr.node, IPX_NODE_LEN); |
| 1744 | } |
| 1745 | |
| 1746 | rc = ipxrtr_route_packet(sk, usipx, msg, len, flags & MSG_DONTWAIT); |
| 1747 | if (rc >= 0) |
| 1748 | rc = len; |
| 1749 | out: |
| 1750 | release_sock(sk); |
| 1751 | return rc; |
| 1752 | } |
| 1753 | |
| 1754 | |
| 1755 | static int ipx_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
| 1756 | int flags) |
| 1757 | { |
| 1758 | struct sock *sk = sock->sk; |
| 1759 | struct ipx_sock *ipxs = ipx_sk(sk); |
| 1760 | DECLARE_SOCKADDR(struct sockaddr_ipx *, sipx, msg->msg_name); |
| 1761 | struct ipxhdr *ipx = NULL; |
| 1762 | struct sk_buff *skb; |
| 1763 | int copied, rc; |
| 1764 | bool locked = true; |
| 1765 | |
| 1766 | lock_sock(sk); |
| 1767 | /* put the autobinding in */ |
| 1768 | if (!ipxs->port) { |
| 1769 | struct sockaddr_ipx uaddr; |
| 1770 | |
| 1771 | uaddr.sipx_port = 0; |
| 1772 | uaddr.sipx_network = 0; |
| 1773 | |
| 1774 | #ifdef CONFIG_IPX_INTERN |
| 1775 | rc = -ENETDOWN; |
| 1776 | if (!ipxs->intrfc) |
| 1777 | goto out; /* Someone zonked the iface */ |
| 1778 | memcpy(uaddr.sipx_node, ipxs->intrfc->if_node, IPX_NODE_LEN); |
| 1779 | #endif /* CONFIG_IPX_INTERN */ |
| 1780 | |
| 1781 | rc = __ipx_bind(sock, (struct sockaddr *)&uaddr, |
| 1782 | sizeof(struct sockaddr_ipx)); |
| 1783 | if (rc) |
| 1784 | goto out; |
| 1785 | } |
| 1786 | |
| 1787 | rc = -ENOTCONN; |
| 1788 | if (sock_flag(sk, SOCK_ZAPPED)) |
| 1789 | goto out; |
| 1790 | |
| 1791 | release_sock(sk); |
| 1792 | locked = false; |
| 1793 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, |
| 1794 | flags & MSG_DONTWAIT, &rc); |
| 1795 | if (!skb) { |
| 1796 | if (rc == -EAGAIN && (sk->sk_shutdown & RCV_SHUTDOWN)) |
| 1797 | rc = 0; |
| 1798 | goto out; |
| 1799 | } |
| 1800 | |
| 1801 | ipx = ipx_hdr(skb); |
| 1802 | copied = ntohs(ipx->ipx_pktsize) - sizeof(struct ipxhdr); |
| 1803 | if (copied > size) { |
| 1804 | copied = size; |
| 1805 | msg->msg_flags |= MSG_TRUNC; |
| 1806 | } |
| 1807 | |
| 1808 | rc = skb_copy_datagram_msg(skb, sizeof(struct ipxhdr), msg, copied); |
| 1809 | if (rc) |
| 1810 | goto out_free; |
| 1811 | if (skb->tstamp.tv64) |
| 1812 | sk->sk_stamp = skb->tstamp; |
| 1813 | |
| 1814 | if (sipx) { |
| 1815 | sipx->sipx_family = AF_IPX; |
| 1816 | sipx->sipx_port = ipx->ipx_source.sock; |
| 1817 | memcpy(sipx->sipx_node, ipx->ipx_source.node, IPX_NODE_LEN); |
| 1818 | sipx->sipx_network = IPX_SKB_CB(skb)->ipx_source_net; |
| 1819 | sipx->sipx_type = ipx->ipx_type; |
| 1820 | sipx->sipx_zero = 0; |
| 1821 | msg->msg_namelen = sizeof(*sipx); |
| 1822 | } |
| 1823 | rc = copied; |
| 1824 | |
| 1825 | out_free: |
| 1826 | skb_free_datagram(sk, skb); |
| 1827 | out: |
| 1828 | if (locked) |
| 1829 | release_sock(sk); |
| 1830 | return rc; |
| 1831 | } |
| 1832 | |
| 1833 | |
| 1834 | static int ipx_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 1835 | { |
| 1836 | int rc = 0; |
| 1837 | long amount = 0; |
| 1838 | struct sock *sk = sock->sk; |
| 1839 | void __user *argp = (void __user *)arg; |
| 1840 | |
| 1841 | lock_sock(sk); |
| 1842 | switch (cmd) { |
| 1843 | case TIOCOUTQ: |
| 1844 | amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); |
| 1845 | if (amount < 0) |
| 1846 | amount = 0; |
| 1847 | rc = put_user(amount, (int __user *)argp); |
| 1848 | break; |
| 1849 | case TIOCINQ: { |
| 1850 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
| 1851 | /* These two are safe on a single CPU system as only |
| 1852 | * user tasks fiddle here */ |
| 1853 | if (skb) |
| 1854 | amount = skb->len - sizeof(struct ipxhdr); |
| 1855 | rc = put_user(amount, (int __user *)argp); |
| 1856 | break; |
| 1857 | } |
| 1858 | case SIOCADDRT: |
| 1859 | case SIOCDELRT: |
| 1860 | rc = -EPERM; |
| 1861 | if (capable(CAP_NET_ADMIN)) |
| 1862 | rc = ipxrtr_ioctl(cmd, argp); |
| 1863 | break; |
| 1864 | case SIOCSIFADDR: |
| 1865 | case SIOCAIPXITFCRT: |
| 1866 | case SIOCAIPXPRISLT: |
| 1867 | rc = -EPERM; |
| 1868 | if (!capable(CAP_NET_ADMIN)) |
| 1869 | break; |
| 1870 | case SIOCGIFADDR: |
| 1871 | rc = ipxitf_ioctl(cmd, argp); |
| 1872 | break; |
| 1873 | case SIOCIPXCFGDATA: |
| 1874 | rc = ipxcfg_get_config_data(argp); |
| 1875 | break; |
| 1876 | case SIOCIPXNCPCONN: |
| 1877 | /* |
| 1878 | * This socket wants to take care of the NCP connection |
| 1879 | * handed to us in arg. |
| 1880 | */ |
| 1881 | rc = -EPERM; |
| 1882 | if (!capable(CAP_NET_ADMIN)) |
| 1883 | break; |
| 1884 | rc = get_user(ipx_sk(sk)->ipx_ncp_conn, |
| 1885 | (const unsigned short __user *)argp); |
| 1886 | break; |
| 1887 | case SIOCGSTAMP: |
| 1888 | rc = sock_get_timestamp(sk, argp); |
| 1889 | break; |
| 1890 | case SIOCGIFDSTADDR: |
| 1891 | case SIOCSIFDSTADDR: |
| 1892 | case SIOCGIFBRDADDR: |
| 1893 | case SIOCSIFBRDADDR: |
| 1894 | case SIOCGIFNETMASK: |
| 1895 | case SIOCSIFNETMASK: |
| 1896 | rc = -EINVAL; |
| 1897 | break; |
| 1898 | default: |
| 1899 | rc = -ENOIOCTLCMD; |
| 1900 | break; |
| 1901 | } |
| 1902 | release_sock(sk); |
| 1903 | |
| 1904 | return rc; |
| 1905 | } |
| 1906 | |
| 1907 | |
| 1908 | #ifdef CONFIG_COMPAT |
| 1909 | static int ipx_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 1910 | { |
| 1911 | /* |
| 1912 | * These 4 commands use same structure on 32bit and 64bit. Rest of IPX |
| 1913 | * commands is handled by generic ioctl code. As these commands are |
| 1914 | * SIOCPROTOPRIVATE..SIOCPROTOPRIVATE+3, they cannot be handled by generic |
| 1915 | * code. |
| 1916 | */ |
| 1917 | switch (cmd) { |
| 1918 | case SIOCAIPXITFCRT: |
| 1919 | case SIOCAIPXPRISLT: |
| 1920 | case SIOCIPXCFGDATA: |
| 1921 | case SIOCIPXNCPCONN: |
| 1922 | return ipx_ioctl(sock, cmd, arg); |
| 1923 | default: |
| 1924 | return -ENOIOCTLCMD; |
| 1925 | } |
| 1926 | } |
| 1927 | #endif |
| 1928 | |
| 1929 | static int ipx_shutdown(struct socket *sock, int mode) |
| 1930 | { |
| 1931 | struct sock *sk = sock->sk; |
| 1932 | |
| 1933 | if (mode < SHUT_RD || mode > SHUT_RDWR) |
| 1934 | return -EINVAL; |
| 1935 | /* This maps: |
| 1936 | * SHUT_RD (0) -> RCV_SHUTDOWN (1) |
| 1937 | * SHUT_WR (1) -> SEND_SHUTDOWN (2) |
| 1938 | * SHUT_RDWR (2) -> SHUTDOWN_MASK (3) |
| 1939 | */ |
| 1940 | ++mode; |
| 1941 | |
| 1942 | lock_sock(sk); |
| 1943 | sk->sk_shutdown |= mode; |
| 1944 | release_sock(sk); |
| 1945 | sk->sk_state_change(sk); |
| 1946 | |
| 1947 | return 0; |
| 1948 | } |
| 1949 | |
| 1950 | /* |
| 1951 | * Socket family declarations |
| 1952 | */ |
| 1953 | |
| 1954 | static const struct net_proto_family ipx_family_ops = { |
| 1955 | .family = PF_IPX, |
| 1956 | .create = ipx_create, |
| 1957 | .owner = THIS_MODULE, |
| 1958 | }; |
| 1959 | |
| 1960 | static const struct proto_ops ipx_dgram_ops = { |
| 1961 | .family = PF_IPX, |
| 1962 | .owner = THIS_MODULE, |
| 1963 | .release = ipx_release, |
| 1964 | .bind = ipx_bind, |
| 1965 | .connect = ipx_connect, |
| 1966 | .socketpair = sock_no_socketpair, |
| 1967 | .accept = sock_no_accept, |
| 1968 | .getname = ipx_getname, |
| 1969 | .poll = datagram_poll, |
| 1970 | .ioctl = ipx_ioctl, |
| 1971 | #ifdef CONFIG_COMPAT |
| 1972 | .compat_ioctl = ipx_compat_ioctl, |
| 1973 | #endif |
| 1974 | .listen = sock_no_listen, |
| 1975 | .shutdown = ipx_shutdown, |
| 1976 | .setsockopt = ipx_setsockopt, |
| 1977 | .getsockopt = ipx_getsockopt, |
| 1978 | .sendmsg = ipx_sendmsg, |
| 1979 | .recvmsg = ipx_recvmsg, |
| 1980 | .mmap = sock_no_mmap, |
| 1981 | .sendpage = sock_no_sendpage, |
| 1982 | }; |
| 1983 | |
| 1984 | static struct packet_type ipx_8023_packet_type __read_mostly = { |
| 1985 | .type = cpu_to_be16(ETH_P_802_3), |
| 1986 | .func = ipx_rcv, |
| 1987 | }; |
| 1988 | |
| 1989 | static struct packet_type ipx_dix_packet_type __read_mostly = { |
| 1990 | .type = cpu_to_be16(ETH_P_IPX), |
| 1991 | .func = ipx_rcv, |
| 1992 | }; |
| 1993 | |
| 1994 | static struct notifier_block ipx_dev_notifier = { |
| 1995 | .notifier_call = ipxitf_device_event, |
| 1996 | }; |
| 1997 | |
| 1998 | static const unsigned char ipx_8022_type = 0xE0; |
| 1999 | static const unsigned char ipx_snap_id[5] = { 0x0, 0x0, 0x0, 0x81, 0x37 }; |
| 2000 | static const char ipx_EII_err_msg[] __initconst = |
| 2001 | KERN_CRIT "IPX: Unable to register with Ethernet II\n"; |
| 2002 | static const char ipx_8023_err_msg[] __initconst = |
| 2003 | KERN_CRIT "IPX: Unable to register with 802.3\n"; |
| 2004 | static const char ipx_llc_err_msg[] __initconst = |
| 2005 | KERN_CRIT "IPX: Unable to register with 802.2\n"; |
| 2006 | static const char ipx_snap_err_msg[] __initconst = |
| 2007 | KERN_CRIT "IPX: Unable to register with SNAP\n"; |
| 2008 | |
| 2009 | static int __init ipx_init(void) |
| 2010 | { |
| 2011 | int rc = proto_register(&ipx_proto, 1); |
| 2012 | |
| 2013 | if (rc != 0) |
| 2014 | goto out; |
| 2015 | |
| 2016 | sock_register(&ipx_family_ops); |
| 2017 | |
| 2018 | pEII_datalink = make_EII_client(); |
| 2019 | if (pEII_datalink) |
| 2020 | dev_add_pack(&ipx_dix_packet_type); |
| 2021 | else |
| 2022 | printk(ipx_EII_err_msg); |
| 2023 | |
| 2024 | p8023_datalink = make_8023_client(); |
| 2025 | if (p8023_datalink) |
| 2026 | dev_add_pack(&ipx_8023_packet_type); |
| 2027 | else |
| 2028 | printk(ipx_8023_err_msg); |
| 2029 | |
| 2030 | p8022_datalink = register_8022_client(ipx_8022_type, ipx_rcv); |
| 2031 | if (!p8022_datalink) |
| 2032 | printk(ipx_llc_err_msg); |
| 2033 | |
| 2034 | pSNAP_datalink = register_snap_client(ipx_snap_id, ipx_rcv); |
| 2035 | if (!pSNAP_datalink) |
| 2036 | printk(ipx_snap_err_msg); |
| 2037 | |
| 2038 | register_netdevice_notifier(&ipx_dev_notifier); |
| 2039 | ipx_register_sysctl(); |
| 2040 | ipx_proc_init(); |
| 2041 | out: |
| 2042 | return rc; |
| 2043 | } |
| 2044 | |
| 2045 | static void __exit ipx_proto_finito(void) |
| 2046 | { |
| 2047 | ipx_proc_exit(); |
| 2048 | ipx_unregister_sysctl(); |
| 2049 | |
| 2050 | unregister_netdevice_notifier(&ipx_dev_notifier); |
| 2051 | |
| 2052 | ipxitf_cleanup(); |
| 2053 | |
| 2054 | if (pSNAP_datalink) { |
| 2055 | unregister_snap_client(pSNAP_datalink); |
| 2056 | pSNAP_datalink = NULL; |
| 2057 | } |
| 2058 | |
| 2059 | if (p8022_datalink) { |
| 2060 | unregister_8022_client(p8022_datalink); |
| 2061 | p8022_datalink = NULL; |
| 2062 | } |
| 2063 | |
| 2064 | dev_remove_pack(&ipx_8023_packet_type); |
| 2065 | if (p8023_datalink) { |
| 2066 | destroy_8023_client(p8023_datalink); |
| 2067 | p8023_datalink = NULL; |
| 2068 | } |
| 2069 | |
| 2070 | dev_remove_pack(&ipx_dix_packet_type); |
| 2071 | if (pEII_datalink) { |
| 2072 | destroy_EII_client(pEII_datalink); |
| 2073 | pEII_datalink = NULL; |
| 2074 | } |
| 2075 | |
| 2076 | proto_unregister(&ipx_proto); |
| 2077 | sock_unregister(ipx_family_ops.family); |
| 2078 | } |
| 2079 | |
| 2080 | module_init(ipx_init); |
| 2081 | module_exit(ipx_proto_finito); |
| 2082 | MODULE_LICENSE("GPL"); |
| 2083 | MODULE_ALIAS_NETPROTO(PF_IPX); |