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

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