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Linux/net/ipx/af_ipx.c

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.75 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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         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;
237 found:
238         return s;
239 }
240 
241 /* caller must hold a reference to intrfc */
242 static 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
257 static 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;
275 found:
276         spin_unlock_bh(&intrfc->if_sklist_lock);
277         ipxitf_put(intrfc);
278         return s;
279 }
280 #endif
281 
282 static 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 
319 void 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 
326 static __inline__ void __ipxitf_put(struct ipx_interface *intrfc)
327 {
328         if (atomic_dec_and_test(&intrfc->refcnt))
329                 __ipxitf_down(intrfc);
330 }
331 
332 static 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);
353 out:
354         return NOTIFY_DONE;
355 }
356 
357 
358 static __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 
368 static 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
381 static 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;
424 out:
425         spin_unlock_bh(&intrfc->if_sklist_lock);
426         return rc;
427 }
428 #else
429 static 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 
466 static 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;
543 out_put:
544         if (sock1)
545                 sock_put(sock1);
546         if (sock2)
547                 sock_put(sock2);
548 out:
549         return rc;
550 }
551 #endif  /* CONFIG_IPX_INTERN */
552 
553 static 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 */
581 int 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);
683 out:
684         return 0;
685 }
686 
687 static int ipxitf_add_local_route(struct ipx_interface *intrfc)
688 {
689         return ipxrtr_add_route(intrfc->if_netnum, intrfc, NULL);
690 }
691 
692 static void ipxitf_discover_netnum(struct ipx_interface *intrfc,
693                                    struct sk_buff *skb);
694 static int ipxitf_pprop(struct ipx_interface *intrfc, struct sk_buff *skb);
695 
696 static 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 */
743 out_free_skb:
744         kfree_skb(skb);
745 out_intrfc:
746         ipxitf_put(intrfc);
747         return rc;
748 }
749 
750 static 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  */
802 static 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);
867 out:
868         return rc;
869 }
870 
871 static 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 
881 static 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 
905 static 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);
935 out:
936         return rc;
937 }
938 
939 static __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 
953 static 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);
1050 out_intrfc:
1051         ipxitf_put(intrfc);
1052         goto out;
1053 out_dev:
1054         dev_put(dev);
1055 out:
1056         return rc;
1057 }
1058 
1059 static 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;
1093 out:
1094         spin_unlock_bh(&ipx_interfaces_lock);
1095         return rc;
1096 }
1097 
1098 static 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 
1132 out:
1133         return intrfc;
1134 }
1135 
1136 static 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 
1262 const 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 
1276 const 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 
1285 static 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;
1306 out:
1307         release_sock(sk);
1308         return rc;
1309 }
1310 
1311 static 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;
1339 out:
1340         release_sock(sk);
1341         return rc;
1342 }
1343 
1344 static struct proto ipx_proto = {
1345         .name     = "IPX",
1346         .owner    = THIS_MODULE,
1347         .obj_size = sizeof(struct ipx_sock),
1348 };
1349 
1350 static 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;
1378 out:
1379         return rc;
1380 }
1381 
1382 static 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);
1399 out:
1400         return 0;
1401 }
1402 
1403 /* caller must hold a reference to intrfc */
1404 
1405 static __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 
1426 static 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;
1516 out_put:
1517         ipxitf_put(intrfc);
1518 out:
1519         return rc;
1520 }
1521 
1522 static 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 
1534 static 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;
1592 out:
1593         release_sock(sk);
1594         return rc;
1595 }
1596 
1597 
1598 static 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;
1643 out:
1644         release_sock(sk);
1645         return rc;
1646 }
1647 
1648 static 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;
1703 drop:
1704         kfree_skb(skb);
1705 out:
1706         return rc;
1707 }
1708 
1709 static 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;
1770 out:
1771         release_sock(sk);
1772         return rc;
1773 }
1774 
1775 
1776 static 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 
1842 out_free:
1843         skb_free_datagram(sk, skb);
1844 out:
1845         release_sock(sk);
1846         return rc;
1847 }
1848 
1849 
1850 static 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
1925 static 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 
1950 static const struct net_proto_family ipx_family_ops = {
1951         .family         = PF_IPX,
1952         .create         = ipx_create,
1953         .owner          = THIS_MODULE,
1954 };
1955 
1956 static 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 
1980 static struct packet_type ipx_8023_packet_type __read_mostly = {
1981         .type           = cpu_to_be16(ETH_P_802_3),
1982         .func           = ipx_rcv,
1983 };
1984 
1985 static struct packet_type ipx_dix_packet_type __read_mostly = {
1986         .type           = cpu_to_be16(ETH_P_IPX),
1987         .func           = ipx_rcv,
1988 };
1989 
1990 static struct notifier_block ipx_dev_notifier = {
1991         .notifier_call  = ipxitf_device_event,
1992 };
1993 
1994 extern struct datalink_proto *make_EII_client(void);
1995 extern void destroy_EII_client(struct datalink_proto *);
1996 
1997 static const unsigned char ipx_8022_type = 0xE0;
1998 static const unsigned char ipx_snap_id[5] = { 0x0, 0x0, 0x0, 0x81, 0x37 };
1999 static const char ipx_EII_err_msg[] __initconst =
2000         KERN_CRIT "IPX: Unable to register with Ethernet II\n";
2001 static const char ipx_8023_err_msg[] __initconst =
2002         KERN_CRIT "IPX: Unable to register with 802.3\n";
2003 static const char ipx_llc_err_msg[] __initconst =
2004         KERN_CRIT "IPX: Unable to register with 802.2\n";
2005 static const char ipx_snap_err_msg[] __initconst =
2006         KERN_CRIT "IPX: Unable to register with SNAP\n";
2007 
2008 static 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();
2040 out:
2041         return rc;
2042 }
2043 
2044 static 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 
2079 module_init(ipx_init);
2080 module_exit(ipx_proto_finito);
2081 MODULE_LICENSE("GPL");
2082 MODULE_ALIAS_NETPROTO(PF_IPX);
2083 

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