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