~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/ipx/af_ipx.c

Version: ~ [ linux-5.6 ] ~ [ linux-5.5.13 ] ~ [ linux-5.4.28 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.113 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.174 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.217 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.217 ] ~ [ 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-3.16.82 ] ~ [ 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/datalink.h>
 56 #include <net/tcp_states.h>
 57 #include <net/net_namespace.h>
 58 
 59 #include <asm/uaccess.h>
 60 
 61 /* Configuration Variables */
 62 static unsigned char ipxcfg_max_hops = 16;
 63 static char ipxcfg_auto_select_primary;
 64 static char ipxcfg_auto_create_interfaces;
 65 int sysctl_ipx_pprop_broadcasting = 1;
 66 
 67 /* Global Variables */
 68 static struct datalink_proto *p8022_datalink;
 69 static struct datalink_proto *pEII_datalink;
 70 static struct datalink_proto *p8023_datalink;
 71 static struct datalink_proto *pSNAP_datalink;
 72 
 73 static const struct proto_ops ipx_dgram_ops;
 74 
 75 LIST_HEAD(ipx_interfaces);
 76 DEFINE_SPINLOCK(ipx_interfaces_lock);
 77 
 78 struct ipx_interface *ipx_primary_net;
 79 struct ipx_interface *ipx_internal_net;
 80 
 81 struct ipx_interface *ipx_interfaces_head(void)
 82 {
 83         struct ipx_interface *rc = NULL;
 84 
 85         if (!list_empty(&ipx_interfaces))
 86                 rc = list_entry(ipx_interfaces.next,
 87                                 struct ipx_interface, node);
 88         return rc;
 89 }
 90 
 91 static void ipxcfg_set_auto_select(char val)
 92 {
 93         ipxcfg_auto_select_primary = val;
 94         if (val && !ipx_primary_net)
 95                 ipx_primary_net = ipx_interfaces_head();
 96 }
 97 
 98 static int ipxcfg_get_config_data(struct ipx_config_data __user *arg)
 99 {
100         struct ipx_config_data vals;
101 
102         vals.ipxcfg_auto_create_interfaces = ipxcfg_auto_create_interfaces;
103         vals.ipxcfg_auto_select_primary    = ipxcfg_auto_select_primary;
104 
105         return copy_to_user(arg, &vals, sizeof(vals)) ? -EFAULT : 0;
106 }
107 
108 /*
109  * Note: Sockets may not be removed _during_ an interrupt or inet_bh
110  * handler using this technique. They can be added although we do not
111  * use this facility.
112  */
113 
114 static void ipx_remove_socket(struct sock *sk)
115 {
116         /* Determine interface with which socket is associated */
117         struct ipx_interface *intrfc = ipx_sk(sk)->intrfc;
118 
119         if (!intrfc)
120                 goto out;
121 
122         ipxitf_hold(intrfc);
123         spin_lock_bh(&intrfc->if_sklist_lock);
124         sk_del_node_init(sk);
125         spin_unlock_bh(&intrfc->if_sklist_lock);
126         ipxitf_put(intrfc);
127 out:
128         return;
129 }
130 
131 static void ipx_destroy_socket(struct sock *sk)
132 {
133         ipx_remove_socket(sk);
134         skb_queue_purge(&sk->sk_receive_queue);
135         sk_refcnt_debug_dec(sk);
136 }
137 
138 /*
139  * The following code is used to support IPX Interfaces (IPXITF).  An
140  * IPX interface is defined by a physical device and a frame type.
141  */
142 
143 /* ipxitf_clear_primary_net has to be called with ipx_interfaces_lock held */
144 
145 static void ipxitf_clear_primary_net(void)
146 {
147         ipx_primary_net = NULL;
148         if (ipxcfg_auto_select_primary)
149                 ipx_primary_net = ipx_interfaces_head();
150 }
151 
152 static struct ipx_interface *__ipxitf_find_using_phys(struct net_device *dev,
153                                                       __be16 datalink)
154 {
155         struct ipx_interface *i;
156 
157         list_for_each_entry(i, &ipx_interfaces, node)
158                 if (i->if_dev == dev && i->if_dlink_type == datalink)
159                         goto out;
160         i = NULL;
161 out:
162         return i;
163 }
164 
165 static struct ipx_interface *ipxitf_find_using_phys(struct net_device *dev,
166                                                     __be16 datalink)
167 {
168         struct ipx_interface *i;
169 
170         spin_lock_bh(&ipx_interfaces_lock);
171         i = __ipxitf_find_using_phys(dev, datalink);
172         if (i)
173                 ipxitf_hold(i);
174         spin_unlock_bh(&ipx_interfaces_lock);
175         return i;
176 }
177 
178 struct ipx_interface *ipxitf_find_using_net(__be32 net)
179 {
180         struct ipx_interface *i;
181 
182         spin_lock_bh(&ipx_interfaces_lock);
183         if (net) {
184                 list_for_each_entry(i, &ipx_interfaces, node)
185                         if (i->if_netnum == net)
186                                 goto hold;
187                 i = NULL;
188                 goto unlock;
189         }
190 
191         i = ipx_primary_net;
192         if (i)
193 hold:
194                 ipxitf_hold(i);
195 unlock:
196         spin_unlock_bh(&ipx_interfaces_lock);
197         return i;
198 }
199 
200 /* Sockets are bound to a particular IPX interface. */
201 static void ipxitf_insert_socket(struct ipx_interface *intrfc, struct sock *sk)
202 {
203         ipxitf_hold(intrfc);
204         spin_lock_bh(&intrfc->if_sklist_lock);
205         ipx_sk(sk)->intrfc = intrfc;
206         sk_add_node(sk, &intrfc->if_sklist);
207         spin_unlock_bh(&intrfc->if_sklist_lock);
208         ipxitf_put(intrfc);
209 }
210 
211 /* caller must hold intrfc->if_sklist_lock */
212 static struct sock *__ipxitf_find_socket(struct ipx_interface *intrfc,
213                                          __be16 port)
214 {
215         struct sock *s;
216 
217         sk_for_each(s, &intrfc->if_sklist)
218                 if (ipx_sk(s)->port == port)
219                         goto found;
220         s = NULL;
221 found:
222         return s;
223 }
224 
225 /* caller must hold a reference to intrfc */
226 static struct sock *ipxitf_find_socket(struct ipx_interface *intrfc,
227                                         __be16 port)
228 {
229         struct sock *s;
230 
231         spin_lock_bh(&intrfc->if_sklist_lock);
232         s = __ipxitf_find_socket(intrfc, port);
233         if (s)
234                 sock_hold(s);
235         spin_unlock_bh(&intrfc->if_sklist_lock);
236 
237         return s;
238 }
239 
240 #ifdef CONFIG_IPX_INTERN
241 static struct sock *ipxitf_find_internal_socket(struct ipx_interface *intrfc,
242                                                 unsigned char *ipx_node,
243                                                 __be16 port)
244 {
245         struct sock *s;
246 
247         ipxitf_hold(intrfc);
248         spin_lock_bh(&intrfc->if_sklist_lock);
249 
250         sk_for_each(s, &intrfc->if_sklist) {
251                 struct ipx_sock *ipxs = ipx_sk(s);
252 
253                 if (ipxs->port == port &&
254                     !memcmp(ipx_node, ipxs->node, IPX_NODE_LEN))
255                         goto found;
256         }
257         s = NULL;
258 found:
259         spin_unlock_bh(&intrfc->if_sklist_lock);
260         ipxitf_put(intrfc);
261         return s;
262 }
263 #endif
264 
265 static void __ipxitf_down(struct ipx_interface *intrfc)
266 {
267         struct sock *s;
268         struct hlist_node *t;
269 
270         /* Delete all routes associated with this interface */
271         ipxrtr_del_routes(intrfc);
272 
273         spin_lock_bh(&intrfc->if_sklist_lock);
274         /* error sockets */
275         sk_for_each_safe(s, t, &intrfc->if_sklist) {
276                 struct ipx_sock *ipxs = ipx_sk(s);
277 
278                 s->sk_err = ENOLINK;
279                 s->sk_error_report(s);
280                 ipxs->intrfc = NULL;
281                 ipxs->port   = 0;
282                 sock_set_flag(s, SOCK_ZAPPED); /* Indicates it is no longer bound */
283                 sk_del_node_init(s);
284         }
285         INIT_HLIST_HEAD(&intrfc->if_sklist);
286         spin_unlock_bh(&intrfc->if_sklist_lock);
287 
288         /* remove this interface from list */
289         list_del(&intrfc->node);
290 
291         /* remove this interface from *special* networks */
292         if (intrfc == ipx_primary_net)
293                 ipxitf_clear_primary_net();
294         if (intrfc == ipx_internal_net)
295                 ipx_internal_net = NULL;
296 
297         if (intrfc->if_dev)
298                 dev_put(intrfc->if_dev);
299         kfree(intrfc);
300 }
301 
302 void ipxitf_down(struct ipx_interface *intrfc)
303 {
304         spin_lock_bh(&ipx_interfaces_lock);
305         __ipxitf_down(intrfc);
306         spin_unlock_bh(&ipx_interfaces_lock);
307 }
308 
309 static void __ipxitf_put(struct ipx_interface *intrfc)
310 {
311         if (atomic_dec_and_test(&intrfc->refcnt))
312                 __ipxitf_down(intrfc);
313 }
314 
315 static int ipxitf_device_event(struct notifier_block *notifier,
316                                 unsigned long event, void *ptr)
317 {
318         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
319         struct ipx_interface *i, *tmp;
320 
321         if (!net_eq(dev_net(dev), &init_net))
322                 return NOTIFY_DONE;
323 
324         if (event != NETDEV_DOWN && event != NETDEV_UP)
325                 goto out;
326 
327         spin_lock_bh(&ipx_interfaces_lock);
328         list_for_each_entry_safe(i, tmp, &ipx_interfaces, node)
329                 if (i->if_dev == dev) {
330                         if (event == NETDEV_UP)
331                                 ipxitf_hold(i);
332                         else
333                                 __ipxitf_put(i);
334                 }
335         spin_unlock_bh(&ipx_interfaces_lock);
336 out:
337         return NOTIFY_DONE;
338 }
339 
340 
341 static __exit void ipxitf_cleanup(void)
342 {
343         struct ipx_interface *i, *tmp;
344 
345         spin_lock_bh(&ipx_interfaces_lock);
346         list_for_each_entry_safe(i, tmp, &ipx_interfaces, node)
347                 __ipxitf_put(i);
348         spin_unlock_bh(&ipx_interfaces_lock);
349 }
350 
351 static void ipxitf_def_skb_handler(struct sock *sock, struct sk_buff *skb)
352 {
353         if (sock_queue_rcv_skb(sock, skb) < 0)
354                 kfree_skb(skb);
355 }
356 
357 /*
358  * On input skb->sk is NULL. Nobody is charged for the memory.
359  */
360 
361 /* caller must hold a reference to intrfc */
362 
363 #ifdef CONFIG_IPX_INTERN
364 static int ipxitf_demux_socket(struct ipx_interface *intrfc,
365                                struct sk_buff *skb, int copy)
366 {
367         struct ipxhdr *ipx = ipx_hdr(skb);
368         int is_broadcast = !memcmp(ipx->ipx_dest.node, ipx_broadcast_node,
369                                    IPX_NODE_LEN);
370         struct sock *s;
371         int rc;
372 
373         spin_lock_bh(&intrfc->if_sklist_lock);
374 
375         sk_for_each(s, &intrfc->if_sklist) {
376                 struct ipx_sock *ipxs = ipx_sk(s);
377 
378                 if (ipxs->port == ipx->ipx_dest.sock &&
379                     (is_broadcast || !memcmp(ipx->ipx_dest.node,
380                                              ipxs->node, IPX_NODE_LEN))) {
381                         /* We found a socket to which to send */
382                         struct sk_buff *skb1;
383 
384                         if (copy) {
385                                 skb1 = skb_clone(skb, GFP_ATOMIC);
386                                 rc = -ENOMEM;
387                                 if (!skb1)
388                                         goto out;
389                         } else {
390                                 skb1 = skb;
391                                 copy = 1; /* skb may only be used once */
392                         }
393                         ipxitf_def_skb_handler(s, skb1);
394 
395                         /* On an external interface, one socket can listen */
396                         if (intrfc != ipx_internal_net)
397                                 break;
398                 }
399         }
400 
401         /* skb was solely for us, and we did not make a copy, so free it. */
402         if (!copy)
403                 kfree_skb(skb);
404 
405         rc = 0;
406 out:
407         spin_unlock_bh(&intrfc->if_sklist_lock);
408         return rc;
409 }
410 #else
411 static struct sock *ncp_connection_hack(struct ipx_interface *intrfc,
412                                         struct ipxhdr *ipx)
413 {
414         /* The packet's target is a NCP connection handler. We want to hand it
415          * to the correct socket directly within the kernel, so that the
416          * mars_nwe packet distribution process does not have to do it. Here we
417          * only care about NCP and BURST packets.
418          *
419          * You might call this a hack, but believe me, you do not want a
420          * complete NCP layer in the kernel, and this is VERY fast as well. */
421         struct sock *sk = NULL;
422         int connection = 0;
423         u8 *ncphdr = (u8 *)(ipx + 1);
424 
425         if (*ncphdr == 0x22 && *(ncphdr + 1) == 0x22) /* NCP request */
426                 connection = (((int) *(ncphdr + 5)) << 8) | (int) *(ncphdr + 3);
427         else if (*ncphdr == 0x77 && *(ncphdr + 1) == 0x77) /* BURST packet */
428                 connection = (((int) *(ncphdr + 9)) << 8) | (int) *(ncphdr + 8);
429 
430         if (connection) {
431                 /* Now we have to look for a special NCP connection handling
432                  * socket. Only these sockets have ipx_ncp_conn != 0, set by
433                  * SIOCIPXNCPCONN. */
434                 spin_lock_bh(&intrfc->if_sklist_lock);
435                 sk_for_each(sk, &intrfc->if_sklist)
436                         if (ipx_sk(sk)->ipx_ncp_conn == connection) {
437                                 sock_hold(sk);
438                                 goto found;
439                         }
440                 sk = NULL;
441         found:
442                 spin_unlock_bh(&intrfc->if_sklist_lock);
443         }
444         return sk;
445 }
446 
447 static int ipxitf_demux_socket(struct ipx_interface *intrfc,
448                                struct sk_buff *skb, int copy)
449 {
450         struct ipxhdr *ipx = ipx_hdr(skb);
451         struct sock *sock1 = NULL, *sock2 = NULL;
452         struct sk_buff *skb1 = NULL, *skb2 = NULL;
453         int rc;
454 
455         if (intrfc == ipx_primary_net && ntohs(ipx->ipx_dest.sock) == 0x451)
456                 sock1 = ncp_connection_hack(intrfc, ipx);
457         if (!sock1)
458                 /* No special socket found, forward the packet the normal way */
459                 sock1 = ipxitf_find_socket(intrfc, ipx->ipx_dest.sock);
460 
461         /*
462          * We need to check if there is a primary net and if
463          * this is addressed to one of the *SPECIAL* sockets because
464          * these need to be propagated to the primary net.
465          * The *SPECIAL* socket list contains: 0x452(SAP), 0x453(RIP) and
466          * 0x456(Diagnostic).
467          */
468 
469         if (ipx_primary_net && intrfc != ipx_primary_net) {
470                 const int dsock = ntohs(ipx->ipx_dest.sock);
471 
472                 if (dsock == 0x452 || dsock == 0x453 || dsock == 0x456)
473                         /* The appropriate thing to do here is to dup the
474                          * packet and route to the primary net interface via
475                          * ipxitf_send; however, we'll cheat and just demux it
476                          * here. */
477                         sock2 = ipxitf_find_socket(ipx_primary_net,
478                                                         ipx->ipx_dest.sock);
479         }
480 
481         /*
482          * If there is nothing to do return. The kfree will cancel any charging.
483          */
484         rc = 0;
485         if (!sock1 && !sock2) {
486                 if (!copy)
487                         kfree_skb(skb);
488                 goto out;
489         }
490 
491         /*
492          * This next segment of code is a little awkward, but it sets it up
493          * so that the appropriate number of copies of the SKB are made and
494          * that skb1 and skb2 point to it (them) so that it (they) can be
495          * demuxed to sock1 and/or sock2.  If we are unable to make enough
496          * copies, we do as much as is possible.
497          */
498 
499         if (copy)
500                 skb1 = skb_clone(skb, GFP_ATOMIC);
501         else
502                 skb1 = skb;
503 
504         rc = -ENOMEM;
505         if (!skb1)
506                 goto out_put;
507 
508         /* Do we need 2 SKBs? */
509         if (sock1 && sock2)
510                 skb2 = skb_clone(skb1, GFP_ATOMIC);
511         else
512                 skb2 = skb1;
513 
514         if (sock1)
515                 ipxitf_def_skb_handler(sock1, skb1);
516 
517         if (!skb2)
518                 goto out_put;
519 
520         if (sock2)
521                 ipxitf_def_skb_handler(sock2, skb2);
522 
523         rc = 0;
524 out_put:
525         if (sock1)
526                 sock_put(sock1);
527         if (sock2)
528                 sock_put(sock2);
529 out:
530         return rc;
531 }
532 #endif  /* CONFIG_IPX_INTERN */
533 
534 static struct sk_buff *ipxitf_adjust_skbuff(struct ipx_interface *intrfc,
535                                             struct sk_buff *skb)
536 {
537         struct sk_buff *skb2;
538         int in_offset = (unsigned char *)ipx_hdr(skb) - skb->head;
539         int out_offset = intrfc->if_ipx_offset;
540         int len;
541 
542         /* Hopefully, most cases */
543         if (in_offset >= out_offset)
544                 return skb;
545 
546         /* Need new SKB */
547         len  = skb->len + out_offset;
548         skb2 = alloc_skb(len, GFP_ATOMIC);
549         if (skb2) {
550                 skb_reserve(skb2, out_offset);
551                 skb_reset_network_header(skb2);
552                 skb_reset_transport_header(skb2);
553                 skb_put(skb2, skb->len);
554                 memcpy(ipx_hdr(skb2), ipx_hdr(skb), skb->len);
555                 memcpy(skb2->cb, skb->cb, sizeof(skb->cb));
556         }
557         kfree_skb(skb);
558         return skb2;
559 }
560 
561 /* caller must hold a reference to intrfc and the skb has to be unshared */
562 int ipxitf_send(struct ipx_interface *intrfc, struct sk_buff *skb, char *node)
563 {
564         struct ipxhdr *ipx = ipx_hdr(skb);
565         struct net_device *dev = intrfc->if_dev;
566         struct datalink_proto *dl = intrfc->if_dlink;
567         char dest_node[IPX_NODE_LEN];
568         int send_to_wire = 1;
569         int addr_len;
570 
571         ipx->ipx_tctrl = IPX_SKB_CB(skb)->ipx_tctrl;
572         ipx->ipx_dest.net = IPX_SKB_CB(skb)->ipx_dest_net;
573         ipx->ipx_source.net = IPX_SKB_CB(skb)->ipx_source_net;
574 
575         /* see if we need to include the netnum in the route list */
576         if (IPX_SKB_CB(skb)->last_hop.index >= 0) {
577                 __be32 *last_hop = (__be32 *)(((u8 *) skb->data) +
578                                 sizeof(struct ipxhdr) +
579                                 IPX_SKB_CB(skb)->last_hop.index *
580                                 sizeof(__be32));
581                 *last_hop = IPX_SKB_CB(skb)->last_hop.netnum;
582                 IPX_SKB_CB(skb)->last_hop.index = -1;
583         }
584 
585         /*
586          * We need to know how many skbuffs it will take to send out this
587          * packet to avoid unnecessary copies.
588          */
589 
590         if (!dl || !dev || dev->flags & IFF_LOOPBACK)
591                 send_to_wire = 0;       /* No non looped */
592 
593         /*
594          * See if this should be demuxed to sockets on this interface
595          *
596          * We want to ensure the original was eaten or that we only use
597          * up clones.
598          */
599 
600         if (ipx->ipx_dest.net == intrfc->if_netnum) {
601                 /*
602                  * To our own node, loop and free the original.
603                  * The internal net will receive on all node address.
604                  */
605                 if (intrfc == ipx_internal_net ||
606                     !memcmp(intrfc->if_node, node, IPX_NODE_LEN)) {
607                         /* Don't charge sender */
608                         skb_orphan(skb);
609 
610                         /* Will charge receiver */
611                         return ipxitf_demux_socket(intrfc, skb, 0);
612                 }
613 
614                 /* Broadcast, loop and possibly keep to send on. */
615                 if (!memcmp(ipx_broadcast_node, node, IPX_NODE_LEN)) {
616                         if (!send_to_wire)
617                                 skb_orphan(skb);
618                         ipxitf_demux_socket(intrfc, skb, send_to_wire);
619                         if (!send_to_wire)
620                                 goto out;
621                 }
622         }
623 
624         /*
625          * If the originating net is not equal to our net; this is routed
626          * We are still charging the sender. Which is right - the driver
627          * free will handle this fairly.
628          */
629         if (ipx->ipx_source.net != intrfc->if_netnum) {
630                 /*
631                  * Unshare the buffer before modifying the count in
632                  * case it's a flood or tcpdump
633                  */
634                 skb = skb_unshare(skb, GFP_ATOMIC);
635                 if (!skb)
636                         goto out;
637                 if (++ipx->ipx_tctrl > ipxcfg_max_hops)
638                         send_to_wire = 0;
639         }
640 
641         if (!send_to_wire) {
642                 kfree_skb(skb);
643                 goto out;
644         }
645 
646         /* Determine the appropriate hardware address */
647         addr_len = dev->addr_len;
648         if (!memcmp(ipx_broadcast_node, node, IPX_NODE_LEN))
649                 memcpy(dest_node, dev->broadcast, addr_len);
650         else
651                 memcpy(dest_node, &(node[IPX_NODE_LEN-addr_len]), addr_len);
652 
653         /* Make any compensation for differing physical/data link size */
654         skb = ipxitf_adjust_skbuff(intrfc, skb);
655         if (!skb)
656                 goto out;
657 
658         /* set up data link and physical headers */
659         skb->dev        = dev;
660         skb->protocol   = htons(ETH_P_IPX);
661 
662         /* Send it out */
663         dl->request(dl, skb, dest_node);
664 out:
665         return 0;
666 }
667 
668 static int ipxitf_add_local_route(struct ipx_interface *intrfc)
669 {
670         return ipxrtr_add_route(intrfc->if_netnum, intrfc, NULL);
671 }
672 
673 static void ipxitf_discover_netnum(struct ipx_interface *intrfc,
674                                    struct sk_buff *skb);
675 static int ipxitf_pprop(struct ipx_interface *intrfc, struct sk_buff *skb);
676 
677 static int ipxitf_rcv(struct ipx_interface *intrfc, struct sk_buff *skb)
678 {
679         struct ipxhdr *ipx = ipx_hdr(skb);
680         int rc = 0;
681 
682         ipxitf_hold(intrfc);
683 
684         /* See if we should update our network number */
685         if (!intrfc->if_netnum) /* net number of intrfc not known yet */
686                 ipxitf_discover_netnum(intrfc, skb);
687 
688         IPX_SKB_CB(skb)->last_hop.index = -1;
689         if (ipx->ipx_type == IPX_TYPE_PPROP) {
690                 rc = ipxitf_pprop(intrfc, skb);
691                 if (rc)
692                         goto out_free_skb;
693         }
694 
695         /* local processing follows */
696         if (!IPX_SKB_CB(skb)->ipx_dest_net)
697                 IPX_SKB_CB(skb)->ipx_dest_net = intrfc->if_netnum;
698         if (!IPX_SKB_CB(skb)->ipx_source_net)
699                 IPX_SKB_CB(skb)->ipx_source_net = intrfc->if_netnum;
700 
701         /* it doesn't make sense to route a pprop packet, there's no meaning
702          * in the ipx_dest_net for such packets */
703         if (ipx->ipx_type != IPX_TYPE_PPROP &&
704             intrfc->if_netnum != IPX_SKB_CB(skb)->ipx_dest_net) {
705                 /* We only route point-to-point packets. */
706                 if (skb->pkt_type == PACKET_HOST) {
707                         skb = skb_unshare(skb, GFP_ATOMIC);
708                         if (skb)
709                                 rc = ipxrtr_route_skb(skb);
710                         goto out_intrfc;
711                 }
712 
713                 goto out_free_skb;
714         }
715 
716         /* see if we should keep it */
717         if (!memcmp(ipx_broadcast_node, ipx->ipx_dest.node, IPX_NODE_LEN) ||
718             !memcmp(intrfc->if_node, ipx->ipx_dest.node, IPX_NODE_LEN)) {
719                 rc = ipxitf_demux_socket(intrfc, skb, 0);
720                 goto out_intrfc;
721         }
722 
723         /* we couldn't pawn it off so unload it */
724 out_free_skb:
725         kfree_skb(skb);
726 out_intrfc:
727         ipxitf_put(intrfc);
728         return rc;
729 }
730 
731 static void ipxitf_discover_netnum(struct ipx_interface *intrfc,
732                                    struct sk_buff *skb)
733 {
734         const struct ipx_cb *cb = IPX_SKB_CB(skb);
735 
736         /* see if this is an intra packet: source_net == dest_net */
737         if (cb->ipx_source_net == cb->ipx_dest_net && cb->ipx_source_net) {
738                 struct ipx_interface *i =
739                                 ipxitf_find_using_net(cb->ipx_source_net);
740                 /* NB: NetWare servers lie about their hop count so we
741                  * dropped the test based on it. This is the best way
742                  * to determine this is a 0 hop count packet. */
743                 if (!i) {
744                         intrfc->if_netnum = cb->ipx_source_net;
745                         ipxitf_add_local_route(intrfc);
746                 } else {
747                         printk(KERN_WARNING "IPX: Network number collision "
748                                 "%lx\n        %s %s and %s %s\n",
749                                 (unsigned long) ntohl(cb->ipx_source_net),
750                                 ipx_device_name(i),
751                                 ipx_frame_name(i->if_dlink_type),
752                                 ipx_device_name(intrfc),
753                                 ipx_frame_name(intrfc->if_dlink_type));
754                         ipxitf_put(i);
755                 }
756         }
757 }
758 
759 /**
760  * ipxitf_pprop - Process packet propagation IPX packet type 0x14, used for
761  *                NetBIOS broadcasts
762  * @intrfc: IPX interface receiving this packet
763  * @skb: Received packet
764  *
765  * Checks if packet is valid: if its more than %IPX_MAX_PPROP_HOPS hops or if it
766  * is smaller than a IPX header + the room for %IPX_MAX_PPROP_HOPS hops we drop
767  * it, not even processing it locally, if it has exact %IPX_MAX_PPROP_HOPS we
768  * don't broadcast it, but process it locally. See chapter 5 of Novell's "IPX
769  * RIP and SAP Router Specification", Part Number 107-000029-001.
770  *
771  * If it is valid, check if we have pprop broadcasting enabled by the user,
772  * if not, just return zero for local processing.
773  *
774  * If it is enabled check the packet and don't broadcast it if we have already
775  * seen this packet.
776  *
777  * Broadcast: send it to the interfaces that aren't on the packet visited nets
778  * array, just after the IPX header.
779  *
780  * Returns -EINVAL for invalid packets, so that the calling function drops
781  * the packet without local processing. 0 if packet is to be locally processed.
782  */
783 static int ipxitf_pprop(struct ipx_interface *intrfc, struct sk_buff *skb)
784 {
785         struct ipxhdr *ipx = ipx_hdr(skb);
786         int i, rc = -EINVAL;
787         struct ipx_interface *ifcs;
788         char *c;
789         __be32 *l;
790 
791         /* Illegal packet - too many hops or too short */
792         /* We decide to throw it away: no broadcasting, no local processing.
793          * NetBIOS unaware implementations route them as normal packets -
794          * tctrl <= 15, any data payload... */
795         if (IPX_SKB_CB(skb)->ipx_tctrl > IPX_MAX_PPROP_HOPS ||
796             ntohs(ipx->ipx_pktsize) < sizeof(struct ipxhdr) +
797                                         IPX_MAX_PPROP_HOPS * sizeof(u32))
798                 goto out;
799         /* are we broadcasting this damn thing? */
800         rc = 0;
801         if (!sysctl_ipx_pprop_broadcasting)
802                 goto out;
803         /* We do broadcast packet on the IPX_MAX_PPROP_HOPS hop, but we
804          * process it locally. All previous hops broadcasted it, and process it
805          * locally. */
806         if (IPX_SKB_CB(skb)->ipx_tctrl == IPX_MAX_PPROP_HOPS)
807                 goto out;
808 
809         c = ((u8 *) ipx) + sizeof(struct ipxhdr);
810         l = (__be32 *) c;
811 
812         /* Don't broadcast packet if already seen this net */
813         for (i = 0; i < IPX_SKB_CB(skb)->ipx_tctrl; i++)
814                 if (*l++ == intrfc->if_netnum)
815                         goto out;
816 
817         /* < IPX_MAX_PPROP_HOPS hops && input interface not in list. Save the
818          * position where we will insert recvd netnum into list, later on,
819          * in ipxitf_send */
820         IPX_SKB_CB(skb)->last_hop.index = i;
821         IPX_SKB_CB(skb)->last_hop.netnum = intrfc->if_netnum;
822         /* xmit on all other interfaces... */
823         spin_lock_bh(&ipx_interfaces_lock);
824         list_for_each_entry(ifcs, &ipx_interfaces, node) {
825                 /* Except unconfigured interfaces */
826                 if (!ifcs->if_netnum)
827                         continue;
828 
829                 /* That aren't in the list */
830                 if (ifcs == intrfc)
831                         continue;
832                 l = (__be32 *) c;
833                 /* don't consider the last entry in the packet list,
834                  * it is our netnum, and it is not there yet */
835                 for (i = 0; i < IPX_SKB_CB(skb)->ipx_tctrl; i++)
836                         if (ifcs->if_netnum == *l++)
837                                 break;
838                 if (i == IPX_SKB_CB(skb)->ipx_tctrl) {
839                         struct sk_buff *s = skb_copy(skb, GFP_ATOMIC);
840 
841                         if (s) {
842                                 IPX_SKB_CB(s)->ipx_dest_net = ifcs->if_netnum;
843                                 ipxrtr_route_skb(s);
844                         }
845                 }
846         }
847         spin_unlock_bh(&ipx_interfaces_lock);
848 out:
849         return rc;
850 }
851 
852 static void ipxitf_insert(struct ipx_interface *intrfc)
853 {
854         spin_lock_bh(&ipx_interfaces_lock);
855         list_add_tail(&intrfc->node, &ipx_interfaces);
856         spin_unlock_bh(&ipx_interfaces_lock);
857 
858         if (ipxcfg_auto_select_primary && !ipx_primary_net)
859                 ipx_primary_net = intrfc;
860 }
861 
862 static struct ipx_interface *ipxitf_alloc(struct net_device *dev, __be32 netnum,
863                                           __be16 dlink_type,
864                                           struct datalink_proto *dlink,
865                                           unsigned char internal,
866                                           int ipx_offset)
867 {
868         struct ipx_interface *intrfc = kmalloc(sizeof(*intrfc), GFP_ATOMIC);
869 
870         if (intrfc) {
871                 intrfc->if_dev          = dev;
872                 intrfc->if_netnum       = netnum;
873                 intrfc->if_dlink_type   = dlink_type;
874                 intrfc->if_dlink        = dlink;
875                 intrfc->if_internal     = internal;
876                 intrfc->if_ipx_offset   = ipx_offset;
877                 intrfc->if_sknum        = IPX_MIN_EPHEMERAL_SOCKET;
878                 INIT_HLIST_HEAD(&intrfc->if_sklist);
879                 atomic_set(&intrfc->refcnt, 1);
880                 spin_lock_init(&intrfc->if_sklist_lock);
881         }
882 
883         return intrfc;
884 }
885 
886 static int ipxitf_create_internal(struct ipx_interface_definition *idef)
887 {
888         struct ipx_interface *intrfc;
889         int rc = -EEXIST;
890 
891         /* Only one primary network allowed */
892         if (ipx_primary_net)
893                 goto out;
894 
895         /* Must have a valid network number */
896         rc = -EADDRNOTAVAIL;
897         if (!idef->ipx_network)
898                 goto out;
899         intrfc = ipxitf_find_using_net(idef->ipx_network);
900         rc = -EADDRINUSE;
901         if (intrfc) {
902                 ipxitf_put(intrfc);
903                 goto out;
904         }
905         intrfc = ipxitf_alloc(NULL, idef->ipx_network, 0, NULL, 1, 0);
906         rc = -EAGAIN;
907         if (!intrfc)
908                 goto out;
909         memcpy((char *)&(intrfc->if_node), idef->ipx_node, IPX_NODE_LEN);
910         ipx_internal_net = ipx_primary_net = intrfc;
911         ipxitf_hold(intrfc);
912         ipxitf_insert(intrfc);
913 
914         rc = ipxitf_add_local_route(intrfc);
915         ipxitf_put(intrfc);
916 out:
917         return rc;
918 }
919 
920 static __be16 ipx_map_frame_type(unsigned char type)
921 {
922         __be16 rc = 0;
923 
924         switch (type) {
925         case IPX_FRAME_ETHERII: rc = htons(ETH_P_IPX);          break;
926         case IPX_FRAME_8022:    rc = htons(ETH_P_802_2);        break;
927         case IPX_FRAME_SNAP:    rc = htons(ETH_P_SNAP);         break;
928         case IPX_FRAME_8023:    rc = htons(ETH_P_802_3);        break;
929         }
930 
931         return rc;
932 }
933 
934 static int ipxitf_create(struct ipx_interface_definition *idef)
935 {
936         struct net_device *dev;
937         __be16 dlink_type = 0;
938         struct datalink_proto *datalink = NULL;
939         struct ipx_interface *intrfc;
940         int rc;
941 
942         if (idef->ipx_special == IPX_INTERNAL) {
943                 rc = ipxitf_create_internal(idef);
944                 goto out;
945         }
946 
947         rc = -EEXIST;
948         if (idef->ipx_special == IPX_PRIMARY && ipx_primary_net)
949                 goto out;
950 
951         intrfc = ipxitf_find_using_net(idef->ipx_network);
952         rc = -EADDRINUSE;
953         if (idef->ipx_network && intrfc) {
954                 ipxitf_put(intrfc);
955                 goto out;
956         }
957 
958         if (intrfc)
959                 ipxitf_put(intrfc);
960 
961         dev = dev_get_by_name(&init_net, idef->ipx_device);
962         rc = -ENODEV;
963         if (!dev)
964                 goto out;
965 
966         switch (idef->ipx_dlink_type) {
967         case IPX_FRAME_8022:
968                 dlink_type      = htons(ETH_P_802_2);
969                 datalink        = p8022_datalink;
970                 break;
971         case IPX_FRAME_ETHERII:
972                 if (dev->type != ARPHRD_IEEE802) {
973                         dlink_type      = htons(ETH_P_IPX);
974                         datalink        = pEII_datalink;
975                         break;
976                 }
977                 /* fall through */
978         case IPX_FRAME_SNAP:
979                 dlink_type      = htons(ETH_P_SNAP);
980                 datalink        = pSNAP_datalink;
981                 break;
982         case IPX_FRAME_8023:
983                 dlink_type      = htons(ETH_P_802_3);
984                 datalink        = p8023_datalink;
985                 break;
986         case IPX_FRAME_NONE:
987         default:
988                 rc = -EPROTONOSUPPORT;
989                 goto out_dev;
990         }
991 
992         rc = -ENETDOWN;
993         if (!(dev->flags & IFF_UP))
994                 goto out_dev;
995 
996         /* Check addresses are suitable */
997         rc = -EINVAL;
998         if (dev->addr_len > IPX_NODE_LEN)
999                 goto out_dev;
1000 
1001         intrfc = ipxitf_find_using_phys(dev, dlink_type);
1002         if (!intrfc) {
1003                 /* Ok now create */
1004                 intrfc = ipxitf_alloc(dev, idef->ipx_network, dlink_type,
1005                                       datalink, 0, dev->hard_header_len +
1006                                         datalink->header_length);
1007                 rc = -EAGAIN;
1008                 if (!intrfc)
1009                         goto out_dev;
1010                 /* Setup primary if necessary */
1011                 if (idef->ipx_special == IPX_PRIMARY)
1012                         ipx_primary_net = intrfc;
1013                 if (!memcmp(idef->ipx_node, "\000\000\000\000\000\000",
1014                             IPX_NODE_LEN)) {
1015                         memset(intrfc->if_node, 0, IPX_NODE_LEN);
1016                         memcpy(intrfc->if_node + IPX_NODE_LEN - dev->addr_len,
1017                                 dev->dev_addr, dev->addr_len);
1018                 } else
1019                         memcpy(intrfc->if_node, idef->ipx_node, IPX_NODE_LEN);
1020                 ipxitf_hold(intrfc);
1021                 ipxitf_insert(intrfc);
1022         }
1023 
1024 
1025         /* If the network number is known, add a route */
1026         rc = 0;
1027         if (!intrfc->if_netnum)
1028                 goto out_intrfc;
1029 
1030         rc = ipxitf_add_local_route(intrfc);
1031 out_intrfc:
1032         ipxitf_put(intrfc);
1033         goto out;
1034 out_dev:
1035         dev_put(dev);
1036 out:
1037         return rc;
1038 }
1039 
1040 static int ipxitf_delete(struct ipx_interface_definition *idef)
1041 {
1042         struct net_device *dev = NULL;
1043         __be16 dlink_type = 0;
1044         struct ipx_interface *intrfc;
1045         int rc = 0;
1046 
1047         spin_lock_bh(&ipx_interfaces_lock);
1048         if (idef->ipx_special == IPX_INTERNAL) {
1049                 if (ipx_internal_net) {
1050                         __ipxitf_put(ipx_internal_net);
1051                         goto out;
1052                 }
1053                 rc = -ENOENT;
1054                 goto out;
1055         }
1056 
1057         dlink_type = ipx_map_frame_type(idef->ipx_dlink_type);
1058         rc = -EPROTONOSUPPORT;
1059         if (!dlink_type)
1060                 goto out;
1061 
1062         dev = __dev_get_by_name(&init_net, idef->ipx_device);
1063         rc = -ENODEV;
1064         if (!dev)
1065                 goto out;
1066 
1067         intrfc = __ipxitf_find_using_phys(dev, dlink_type);
1068         rc = -EINVAL;
1069         if (!intrfc)
1070                 goto out;
1071         __ipxitf_put(intrfc);
1072 
1073         rc = 0;
1074 out:
1075         spin_unlock_bh(&ipx_interfaces_lock);
1076         return rc;
1077 }
1078 
1079 static struct ipx_interface *ipxitf_auto_create(struct net_device *dev,
1080                                                 __be16 dlink_type)
1081 {
1082         struct ipx_interface *intrfc = NULL;
1083         struct datalink_proto *datalink;
1084 
1085         if (!dev)
1086                 goto out;
1087 
1088         /* Check addresses are suitable */
1089         if (dev->addr_len > IPX_NODE_LEN)
1090                 goto out;
1091 
1092         switch (ntohs(dlink_type)) {
1093         case ETH_P_IPX:         datalink = pEII_datalink;       break;
1094         case ETH_P_802_2:       datalink = p8022_datalink;      break;
1095         case ETH_P_SNAP:        datalink = pSNAP_datalink;      break;
1096         case ETH_P_802_3:       datalink = p8023_datalink;      break;
1097         default:                goto out;
1098         }
1099 
1100         intrfc = ipxitf_alloc(dev, 0, dlink_type, datalink, 0,
1101                                 dev->hard_header_len + datalink->header_length);
1102 
1103         if (intrfc) {
1104                 memset(intrfc->if_node, 0, IPX_NODE_LEN);
1105                 memcpy((char *)&(intrfc->if_node[IPX_NODE_LEN-dev->addr_len]),
1106                         dev->dev_addr, dev->addr_len);
1107                 spin_lock_init(&intrfc->if_sklist_lock);
1108                 atomic_set(&intrfc->refcnt, 1);
1109                 ipxitf_insert(intrfc);
1110                 dev_hold(dev);
1111         }
1112 
1113 out:
1114         return intrfc;
1115 }
1116 
1117 static int ipxitf_ioctl(unsigned int cmd, void __user *arg)
1118 {
1119         int rc = -EINVAL;
1120         struct ifreq ifr;
1121         int val;
1122 
1123         switch (cmd) {
1124         case SIOCSIFADDR: {
1125                 struct sockaddr_ipx *sipx;
1126                 struct ipx_interface_definition f;
1127 
1128                 rc = -EFAULT;
1129                 if (copy_from_user(&ifr, arg, sizeof(ifr)))
1130                         break;
1131                 sipx = (struct sockaddr_ipx *)&ifr.ifr_addr;
1132                 rc = -EINVAL;
1133                 if (sipx->sipx_family != AF_IPX)
1134                         break;
1135                 f.ipx_network = sipx->sipx_network;
1136                 memcpy(f.ipx_device, ifr.ifr_name,
1137                         sizeof(f.ipx_device));
1138                 memcpy(f.ipx_node, sipx->sipx_node, IPX_NODE_LEN);
1139                 f.ipx_dlink_type = sipx->sipx_type;
1140                 f.ipx_special = sipx->sipx_special;
1141 
1142                 if (sipx->sipx_action == IPX_DLTITF)
1143                         rc = ipxitf_delete(&f);
1144                 else
1145                         rc = ipxitf_create(&f);
1146                 break;
1147         }
1148         case SIOCGIFADDR: {
1149                 struct sockaddr_ipx *sipx;
1150                 struct ipx_interface *ipxif;
1151                 struct net_device *dev;
1152 
1153                 rc = -EFAULT;
1154                 if (copy_from_user(&ifr, arg, sizeof(ifr)))
1155                         break;
1156                 sipx = (struct sockaddr_ipx *)&ifr.ifr_addr;
1157                 dev  = __dev_get_by_name(&init_net, ifr.ifr_name);
1158                 rc   = -ENODEV;
1159                 if (!dev)
1160                         break;
1161                 ipxif = ipxitf_find_using_phys(dev,
1162                                            ipx_map_frame_type(sipx->sipx_type));
1163                 rc = -EADDRNOTAVAIL;
1164                 if (!ipxif)
1165                         break;
1166 
1167                 sipx->sipx_family       = AF_IPX;
1168                 sipx->sipx_network      = ipxif->if_netnum;
1169                 memcpy(sipx->sipx_node, ipxif->if_node,
1170                         sizeof(sipx->sipx_node));
1171                 rc = -EFAULT;
1172                 if (copy_to_user(arg, &ifr, sizeof(ifr)))
1173                         break;
1174                 ipxitf_put(ipxif);
1175                 rc = 0;
1176                 break;
1177         }
1178         case SIOCAIPXITFCRT:
1179                 rc = -EFAULT;
1180                 if (get_user(val, (unsigned char __user *) arg))
1181                         break;
1182                 rc = 0;
1183                 ipxcfg_auto_create_interfaces = val;
1184                 break;
1185         case SIOCAIPXPRISLT:
1186                 rc = -EFAULT;
1187                 if (get_user(val, (unsigned char __user *) arg))
1188                         break;
1189                 rc = 0;
1190                 ipxcfg_set_auto_select(val);
1191                 break;
1192         }
1193 
1194         return rc;
1195 }
1196 
1197 /*
1198  *      Checksum routine for IPX
1199  */
1200 
1201 /* Note: We assume ipx_tctrl==0 and htons(length)==ipx_pktsize */
1202 /* This functions should *not* mess with packet contents */
1203 
1204 __be16 ipx_cksum(struct ipxhdr *packet, int length)
1205 {
1206         /*
1207          *      NOTE: sum is a net byte order quantity, which optimizes the
1208          *      loop. This only works on big and little endian machines. (I
1209          *      don't know of a machine that isn't.)
1210          */
1211         /* handle the first 3 words separately; checksum should be skipped
1212          * and ipx_tctrl masked out */
1213         __u16 *p = (__u16 *)packet;
1214         __u32 sum = p[1] + (p[2] & (__force u16)htons(0x00ff));
1215         __u32 i = (length >> 1) - 3; /* Number of remaining complete words */
1216 
1217         /* Loop through them */
1218         p += 3;
1219         while (i--)
1220                 sum += *p++;
1221 
1222         /* Add on the last part word if it exists */
1223         if (packet->ipx_pktsize & htons(1))
1224                 sum += (__force u16)htons(0xff00) & *p;
1225 
1226         /* Do final fixup */
1227         sum = (sum & 0xffff) + (sum >> 16);
1228 
1229         /* It's a pity there's no concept of carry in C */
1230         if (sum >= 0x10000)
1231                 sum++;
1232 
1233         /*
1234          * Leave 0 alone; we don't want 0xffff here.  Note that we can't get
1235          * here with 0x10000, so this check is the same as ((__u16)sum)
1236          */
1237         if (sum)
1238                 sum = ~sum;
1239 
1240         return (__force __be16)sum;
1241 }
1242 
1243 const char *ipx_frame_name(__be16 frame)
1244 {
1245         char* rc = "None";
1246 
1247         switch (ntohs(frame)) {
1248         case ETH_P_IPX:         rc = "EtherII"; break;
1249         case ETH_P_802_2:       rc = "802.2";   break;
1250         case ETH_P_SNAP:        rc = "SNAP";    break;
1251         case ETH_P_802_3:       rc = "802.3";   break;
1252         }
1253 
1254         return rc;
1255 }
1256 
1257 const char *ipx_device_name(struct ipx_interface *intrfc)
1258 {
1259         return intrfc->if_internal ? "Internal" :
1260                 intrfc->if_dev ? intrfc->if_dev->name : "Unknown";
1261 }
1262 
1263 /* Handling for system calls applied via the various interfaces to an IPX
1264  * socket object. */
1265 
1266 static int ipx_setsockopt(struct socket *sock, int level, int optname,
1267                           char __user *optval, unsigned int optlen)
1268 {
1269         struct sock *sk = sock->sk;
1270         int opt;
1271         int rc = -EINVAL;
1272 
1273         lock_sock(sk);
1274         if (optlen != sizeof(int))
1275                 goto out;
1276 
1277         rc = -EFAULT;
1278         if (get_user(opt, (unsigned int __user *)optval))
1279                 goto out;
1280 
1281         rc = -ENOPROTOOPT;
1282         if (!(level == SOL_IPX && optname == IPX_TYPE))
1283                 goto out;
1284 
1285         ipx_sk(sk)->type = opt;
1286         rc = 0;
1287 out:
1288         release_sock(sk);
1289         return rc;
1290 }
1291 
1292 static int ipx_getsockopt(struct socket *sock, int level, int optname,
1293         char __user *optval, int __user *optlen)
1294 {
1295         struct sock *sk = sock->sk;
1296         int val = 0;
1297         int len;
1298         int rc = -ENOPROTOOPT;
1299 
1300         lock_sock(sk);
1301         if (!(level == SOL_IPX && optname == IPX_TYPE))
1302                 goto out;
1303 
1304         val = ipx_sk(sk)->type;
1305 
1306         rc = -EFAULT;
1307         if (get_user(len, optlen))
1308                 goto out;
1309 
1310         len = min_t(unsigned int, len, sizeof(int));
1311         rc = -EINVAL;
1312         if(len < 0)
1313                 goto out;
1314 
1315         rc = -EFAULT;
1316         if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1317                 goto out;
1318 
1319         rc = 0;
1320 out:
1321         release_sock(sk);
1322         return rc;
1323 }
1324 
1325 static struct proto ipx_proto = {
1326         .name     = "IPX",
1327         .owner    = THIS_MODULE,
1328         .obj_size = sizeof(struct ipx_sock),
1329 };
1330 
1331 static int ipx_create(struct net *net, struct socket *sock, int protocol,
1332                       int kern)
1333 {
1334         int rc = -ESOCKTNOSUPPORT;
1335         struct sock *sk;
1336 
1337         if (!net_eq(net, &init_net))
1338                 return -EAFNOSUPPORT;
1339 
1340         /*
1341          * SPX support is not anymore in the kernel sources. If you want to
1342          * ressurrect it, completing it and making it understand shared skbs,
1343          * be fully multithreaded, etc, grab the sources in an early 2.5 kernel
1344          * tree.
1345          */
1346         if (sock->type != SOCK_DGRAM)
1347                 goto out;
1348 
1349         rc = -ENOMEM;
1350         sk = sk_alloc(net, PF_IPX, GFP_KERNEL, &ipx_proto, kern);
1351         if (!sk)
1352                 goto out;
1353 
1354         sk_refcnt_debug_inc(sk);
1355         sock_init_data(sock, sk);
1356         sk->sk_no_check_tx = 1;         /* Checksum off by default */
1357         sock->ops = &ipx_dgram_ops;
1358         rc = 0;
1359 out:
1360         return rc;
1361 }
1362 
1363 static int ipx_release(struct socket *sock)
1364 {
1365         struct sock *sk = sock->sk;
1366 
1367         if (!sk)
1368                 goto out;
1369 
1370         lock_sock(sk);
1371         sk->sk_shutdown = SHUTDOWN_MASK;
1372         if (!sock_flag(sk, SOCK_DEAD))
1373                 sk->sk_state_change(sk);
1374 
1375         sock_set_flag(sk, SOCK_DEAD);
1376         sock->sk = NULL;
1377         sk_refcnt_debug_release(sk);
1378         ipx_destroy_socket(sk);
1379         release_sock(sk);
1380         sock_put(sk);
1381 out:
1382         return 0;
1383 }
1384 
1385 /* caller must hold a reference to intrfc */
1386 
1387 static __be16 ipx_first_free_socketnum(struct ipx_interface *intrfc)
1388 {
1389         unsigned short socketNum = intrfc->if_sknum;
1390 
1391         spin_lock_bh(&intrfc->if_sklist_lock);
1392 
1393         if (socketNum < IPX_MIN_EPHEMERAL_SOCKET)
1394                 socketNum = IPX_MIN_EPHEMERAL_SOCKET;
1395 
1396         while (__ipxitf_find_socket(intrfc, htons(socketNum)))
1397                 if (socketNum > IPX_MAX_EPHEMERAL_SOCKET)
1398                         socketNum = IPX_MIN_EPHEMERAL_SOCKET;
1399                 else
1400                         socketNum++;
1401 
1402         spin_unlock_bh(&intrfc->if_sklist_lock);
1403         intrfc->if_sknum = socketNum;
1404 
1405         return htons(socketNum);
1406 }
1407 
1408 static int __ipx_bind(struct socket *sock,
1409                         struct sockaddr *uaddr, int addr_len)
1410 {
1411         struct sock *sk = sock->sk;
1412         struct ipx_sock *ipxs = ipx_sk(sk);
1413         struct ipx_interface *intrfc;
1414         struct sockaddr_ipx *addr = (struct sockaddr_ipx *)uaddr;
1415         int rc = -EINVAL;
1416 
1417         if (!sock_flag(sk, SOCK_ZAPPED) || addr_len != sizeof(struct sockaddr_ipx))
1418                 goto out;
1419 
1420         intrfc = ipxitf_find_using_net(addr->sipx_network);
1421         rc = -EADDRNOTAVAIL;
1422         if (!intrfc)
1423                 goto out;
1424 
1425         if (!addr->sipx_port) {
1426                 addr->sipx_port = ipx_first_free_socketnum(intrfc);
1427                 rc = -EINVAL;
1428                 if (!addr->sipx_port)
1429                         goto out_put;
1430         }
1431 
1432         /* protect IPX system stuff like routing/sap */
1433         rc = -EACCES;
1434         if (ntohs(addr->sipx_port) < IPX_MIN_EPHEMERAL_SOCKET &&
1435             !capable(CAP_NET_ADMIN))
1436                 goto out_put;
1437 
1438         ipxs->port = addr->sipx_port;
1439 
1440 #ifdef CONFIG_IPX_INTERN
1441         if (intrfc == ipx_internal_net) {
1442                 /* The source address is to be set explicitly if the
1443                  * socket is to be bound on the internal network. If a
1444                  * node number 0 was specified, the default is used.
1445                  */
1446 
1447                 rc = -EINVAL;
1448                 if (!memcmp(addr->sipx_node, ipx_broadcast_node, IPX_NODE_LEN))
1449                         goto out_put;
1450                 if (!memcmp(addr->sipx_node, ipx_this_node, IPX_NODE_LEN))
1451                         memcpy(ipxs->node, intrfc->if_node, IPX_NODE_LEN);
1452                 else
1453                         memcpy(ipxs->node, addr->sipx_node, IPX_NODE_LEN);
1454 
1455                 rc = -EADDRINUSE;
1456                 if (ipxitf_find_internal_socket(intrfc, ipxs->node,
1457                                                 ipxs->port)) {
1458                         SOCK_DEBUG(sk,
1459                                 "IPX: bind failed because port %X in use.\n",
1460                                 ntohs(addr->sipx_port));
1461                         goto out_put;
1462                 }
1463         } else {
1464                 /* Source addresses are easy. It must be our
1465                  * network:node pair for an interface routed to IPX
1466                  * with the ipx routing ioctl()
1467                  */
1468 
1469                 memcpy(ipxs->node, intrfc->if_node, IPX_NODE_LEN);
1470 
1471                 rc = -EADDRINUSE;
1472                 if (ipxitf_find_socket(intrfc, addr->sipx_port)) {
1473                         SOCK_DEBUG(sk,
1474                                 "IPX: bind failed because port %X in use.\n",
1475                                 ntohs(addr->sipx_port));
1476                         goto out_put;
1477                 }
1478         }
1479 
1480 #else   /* !def CONFIG_IPX_INTERN */
1481 
1482         /* Source addresses are easy. It must be our network:node pair for
1483            an interface routed to IPX with the ipx routing ioctl() */
1484 
1485         rc = -EADDRINUSE;
1486         if (ipxitf_find_socket(intrfc, addr->sipx_port)) {
1487                 SOCK_DEBUG(sk, "IPX: bind failed because port %X in use.\n",
1488                                 ntohs((int)addr->sipx_port));
1489                 goto out_put;
1490         }
1491 
1492 #endif  /* CONFIG_IPX_INTERN */
1493 
1494         ipxitf_insert_socket(intrfc, sk);
1495         sock_reset_flag(sk, SOCK_ZAPPED);
1496 
1497         rc = 0;
1498 out_put:
1499         ipxitf_put(intrfc);
1500 out:
1501         return rc;
1502 }
1503 
1504 static int ipx_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1505 {
1506         struct sock *sk = sock->sk;
1507         int rc;
1508 
1509         lock_sock(sk);
1510         rc = __ipx_bind(sock, uaddr, addr_len);
1511         release_sock(sk);
1512 
1513         return rc;
1514 }
1515 
1516 static int ipx_connect(struct socket *sock, struct sockaddr *uaddr,
1517         int addr_len, int flags)
1518 {
1519         struct sock *sk = sock->sk;
1520         struct ipx_sock *ipxs = ipx_sk(sk);
1521         struct sockaddr_ipx *addr;
1522         int rc = -EINVAL;
1523         struct ipx_route *rt;
1524 
1525         sk->sk_state    = TCP_CLOSE;
1526         sock->state     = SS_UNCONNECTED;
1527 
1528         lock_sock(sk);
1529         if (addr_len != sizeof(*addr))
1530                 goto out;
1531         addr = (struct sockaddr_ipx *)uaddr;
1532 
1533         /* put the autobinding in */
1534         if (!ipxs->port) {
1535                 struct sockaddr_ipx uaddr;
1536 
1537                 uaddr.sipx_port         = 0;
1538                 uaddr.sipx_network      = 0;
1539 
1540 #ifdef CONFIG_IPX_INTERN
1541                 rc = -ENETDOWN;
1542                 if (!ipxs->intrfc)
1543                         goto out; /* Someone zonked the iface */
1544                 memcpy(uaddr.sipx_node, ipxs->intrfc->if_node,
1545                         IPX_NODE_LEN);
1546 #endif  /* CONFIG_IPX_INTERN */
1547 
1548                 rc = __ipx_bind(sock, (struct sockaddr *)&uaddr,
1549                               sizeof(struct sockaddr_ipx));
1550                 if (rc)
1551                         goto out;
1552         }
1553 
1554         /* We can either connect to primary network or somewhere
1555          * we can route to */
1556         rt = ipxrtr_lookup(addr->sipx_network);
1557         rc = -ENETUNREACH;
1558         if (!rt && !(!addr->sipx_network && ipx_primary_net))
1559                 goto out;
1560 
1561         ipxs->dest_addr.net  = addr->sipx_network;
1562         ipxs->dest_addr.sock = addr->sipx_port;
1563         memcpy(ipxs->dest_addr.node, addr->sipx_node, IPX_NODE_LEN);
1564         ipxs->type = addr->sipx_type;
1565 
1566         if (sock->type == SOCK_DGRAM) {
1567                 sock->state     = SS_CONNECTED;
1568                 sk->sk_state    = TCP_ESTABLISHED;
1569         }
1570 
1571         if (rt)
1572                 ipxrtr_put(rt);
1573         rc = 0;
1574 out:
1575         release_sock(sk);
1576         return rc;
1577 }
1578 
1579 
1580 static int ipx_getname(struct socket *sock, struct sockaddr *uaddr,
1581                         int *uaddr_len, int peer)
1582 {
1583         struct ipx_address *addr;
1584         struct sockaddr_ipx sipx;
1585         struct sock *sk = sock->sk;
1586         struct ipx_sock *ipxs = ipx_sk(sk);
1587         int rc;
1588 
1589         *uaddr_len = sizeof(struct sockaddr_ipx);
1590 
1591         lock_sock(sk);
1592         if (peer) {
1593                 rc = -ENOTCONN;
1594                 if (sk->sk_state != TCP_ESTABLISHED)
1595                         goto out;
1596 
1597                 addr = &ipxs->dest_addr;
1598                 sipx.sipx_network       = addr->net;
1599                 sipx.sipx_port          = addr->sock;
1600                 memcpy(sipx.sipx_node, addr->node, IPX_NODE_LEN);
1601         } else {
1602                 if (ipxs->intrfc) {
1603                         sipx.sipx_network = ipxs->intrfc->if_netnum;
1604 #ifdef CONFIG_IPX_INTERN
1605                         memcpy(sipx.sipx_node, ipxs->node, IPX_NODE_LEN);
1606 #else
1607                         memcpy(sipx.sipx_node, ipxs->intrfc->if_node,
1608                                 IPX_NODE_LEN);
1609 #endif  /* CONFIG_IPX_INTERN */
1610 
1611                 } else {
1612                         sipx.sipx_network = 0;
1613                         memset(sipx.sipx_node, '\0', IPX_NODE_LEN);
1614                 }
1615 
1616                 sipx.sipx_port = ipxs->port;
1617         }
1618 
1619         sipx.sipx_family = AF_IPX;
1620         sipx.sipx_type   = ipxs->type;
1621         sipx.sipx_zero   = 0;
1622         memcpy(uaddr, &sipx, sizeof(sipx));
1623 
1624         rc = 0;
1625 out:
1626         release_sock(sk);
1627         return rc;
1628 }
1629 
1630 static int ipx_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
1631 {
1632         /* NULL here for pt means the packet was looped back */
1633         struct ipx_interface *intrfc;
1634         struct ipxhdr *ipx;
1635         u16 ipx_pktsize;
1636         int rc = 0;
1637 
1638         if (!net_eq(dev_net(dev), &init_net))
1639                 goto drop;
1640 
1641         /* Not ours */
1642         if (skb->pkt_type == PACKET_OTHERHOST)
1643                 goto drop;
1644 
1645         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
1646                 goto out;
1647 
1648         if (!pskb_may_pull(skb, sizeof(struct ipxhdr)))
1649                 goto drop;
1650 
1651         ipx_pktsize = ntohs(ipx_hdr(skb)->ipx_pktsize);
1652 
1653         /* Too small or invalid header? */
1654         if (ipx_pktsize < sizeof(struct ipxhdr) ||
1655             !pskb_may_pull(skb, ipx_pktsize))
1656                 goto drop;
1657 
1658         ipx = ipx_hdr(skb);
1659         if (ipx->ipx_checksum != IPX_NO_CHECKSUM &&
1660            ipx->ipx_checksum != ipx_cksum(ipx, ipx_pktsize))
1661                 goto drop;
1662 
1663         IPX_SKB_CB(skb)->ipx_tctrl      = ipx->ipx_tctrl;
1664         IPX_SKB_CB(skb)->ipx_dest_net   = ipx->ipx_dest.net;
1665         IPX_SKB_CB(skb)->ipx_source_net = ipx->ipx_source.net;
1666 
1667         /* Determine what local ipx endpoint this is */
1668         intrfc = ipxitf_find_using_phys(dev, pt->type);
1669         if (!intrfc) {
1670                 if (ipxcfg_auto_create_interfaces &&
1671                    IPX_SKB_CB(skb)->ipx_dest_net) {
1672                         intrfc = ipxitf_auto_create(dev, pt->type);
1673                         if (intrfc)
1674                                 ipxitf_hold(intrfc);
1675                 }
1676 
1677                 if (!intrfc)    /* Not one of ours */
1678                                 /* or invalid packet for auto creation */
1679                         goto drop;
1680         }
1681 
1682         rc = ipxitf_rcv(intrfc, skb);
1683         ipxitf_put(intrfc);
1684         goto out;
1685 drop:
1686         kfree_skb(skb);
1687 out:
1688         return rc;
1689 }
1690 
1691 static int ipx_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1692 {
1693         struct sock *sk = sock->sk;
1694         struct ipx_sock *ipxs = ipx_sk(sk);
1695         DECLARE_SOCKADDR(struct sockaddr_ipx *, usipx, msg->msg_name);
1696         struct sockaddr_ipx local_sipx;
1697         int rc = -EINVAL;
1698         int flags = msg->msg_flags;
1699 
1700         lock_sock(sk);
1701         /* Socket gets bound below anyway */
1702 /*      if (sk->sk_zapped)
1703                 return -EIO; */ /* Socket not bound */
1704         if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1705                 goto out;
1706 
1707         /* Max possible packet size limited by 16 bit pktsize in header */
1708         if (len >= 65535 - sizeof(struct ipxhdr))
1709                 goto out;
1710 
1711         if (usipx) {
1712                 if (!ipxs->port) {
1713                         struct sockaddr_ipx uaddr;
1714 
1715                         uaddr.sipx_port         = 0;
1716                         uaddr.sipx_network      = 0;
1717 #ifdef CONFIG_IPX_INTERN
1718                         rc = -ENETDOWN;
1719                         if (!ipxs->intrfc)
1720                                 goto out; /* Someone zonked the iface */
1721                         memcpy(uaddr.sipx_node, ipxs->intrfc->if_node,
1722                                 IPX_NODE_LEN);
1723 #endif
1724                         rc = __ipx_bind(sock, (struct sockaddr *)&uaddr,
1725                                         sizeof(struct sockaddr_ipx));
1726                         if (rc)
1727                                 goto out;
1728                 }
1729 
1730                 rc = -EINVAL;
1731                 if (msg->msg_namelen < sizeof(*usipx) ||
1732                     usipx->sipx_family != AF_IPX)
1733                         goto out;
1734         } else {
1735                 rc = -ENOTCONN;
1736                 if (sk->sk_state != TCP_ESTABLISHED)
1737                         goto out;
1738 
1739                 usipx = &local_sipx;
1740                 usipx->sipx_family      = AF_IPX;
1741                 usipx->sipx_type        = ipxs->type;
1742                 usipx->sipx_port        = ipxs->dest_addr.sock;
1743                 usipx->sipx_network     = ipxs->dest_addr.net;
1744                 memcpy(usipx->sipx_node, ipxs->dest_addr.node, IPX_NODE_LEN);
1745         }
1746 
1747         rc = ipxrtr_route_packet(sk, usipx, msg, len, flags & MSG_DONTWAIT);
1748         if (rc >= 0)
1749                 rc = len;
1750 out:
1751         release_sock(sk);
1752         return rc;
1753 }
1754 
1755 
1756 static int ipx_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1757                        int flags)
1758 {
1759         struct sock *sk = sock->sk;
1760         struct ipx_sock *ipxs = ipx_sk(sk);
1761         DECLARE_SOCKADDR(struct sockaddr_ipx *, sipx, msg->msg_name);
1762         struct ipxhdr *ipx = NULL;
1763         struct sk_buff *skb;
1764         int copied, rc;
1765         bool locked = true;
1766 
1767         lock_sock(sk);
1768         /* put the autobinding in */
1769         if (!ipxs->port) {
1770                 struct sockaddr_ipx uaddr;
1771 
1772                 uaddr.sipx_port         = 0;
1773                 uaddr.sipx_network      = 0;
1774 
1775 #ifdef CONFIG_IPX_INTERN
1776                 rc = -ENETDOWN;
1777                 if (!ipxs->intrfc)
1778                         goto out; /* Someone zonked the iface */
1779                 memcpy(uaddr.sipx_node, ipxs->intrfc->if_node, IPX_NODE_LEN);
1780 #endif  /* CONFIG_IPX_INTERN */
1781 
1782                 rc = __ipx_bind(sock, (struct sockaddr *)&uaddr,
1783                               sizeof(struct sockaddr_ipx));
1784                 if (rc)
1785                         goto out;
1786         }
1787 
1788         rc = -ENOTCONN;
1789         if (sock_flag(sk, SOCK_ZAPPED))
1790                 goto out;
1791 
1792         release_sock(sk);
1793         locked = false;
1794         skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1795                                 flags & MSG_DONTWAIT, &rc);
1796         if (!skb) {
1797                 if (rc == -EAGAIN && (sk->sk_shutdown & RCV_SHUTDOWN))
1798                         rc = 0;
1799                 goto out;
1800         }
1801 
1802         ipx     = ipx_hdr(skb);
1803         copied  = ntohs(ipx->ipx_pktsize) - sizeof(struct ipxhdr);
1804         if (copied > size) {
1805                 copied = size;
1806                 msg->msg_flags |= MSG_TRUNC;
1807         }
1808 
1809         rc = skb_copy_datagram_msg(skb, sizeof(struct ipxhdr), msg, copied);
1810         if (rc)
1811                 goto out_free;
1812         if (skb->tstamp.tv64)
1813                 sk->sk_stamp = skb->tstamp;
1814 
1815         if (sipx) {
1816                 sipx->sipx_family       = AF_IPX;
1817                 sipx->sipx_port         = ipx->ipx_source.sock;
1818                 memcpy(sipx->sipx_node, ipx->ipx_source.node, IPX_NODE_LEN);
1819                 sipx->sipx_network      = IPX_SKB_CB(skb)->ipx_source_net;
1820                 sipx->sipx_type         = ipx->ipx_type;
1821                 sipx->sipx_zero         = 0;
1822                 msg->msg_namelen        = sizeof(*sipx);
1823         }
1824         rc = copied;
1825 
1826 out_free:
1827         skb_free_datagram(sk, skb);
1828 out:
1829         if (locked)
1830                 release_sock(sk);
1831         return rc;
1832 }
1833 
1834 
1835 static int ipx_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1836 {
1837         int rc = 0;
1838         long amount = 0;
1839         struct sock *sk = sock->sk;
1840         void __user *argp = (void __user *)arg;
1841 
1842         lock_sock(sk);
1843         switch (cmd) {
1844         case TIOCOUTQ:
1845                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1846                 if (amount < 0)
1847                         amount = 0;
1848                 rc = put_user(amount, (int __user *)argp);
1849                 break;
1850         case TIOCINQ: {
1851                 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
1852                 /* These two are safe on a single CPU system as only
1853                  * user tasks fiddle here */
1854                 if (skb)
1855                         amount = skb->len - sizeof(struct ipxhdr);
1856                 rc = put_user(amount, (int __user *)argp);
1857                 break;
1858         }
1859         case SIOCADDRT:
1860         case SIOCDELRT:
1861                 rc = -EPERM;
1862                 if (capable(CAP_NET_ADMIN))
1863                         rc = ipxrtr_ioctl(cmd, argp);
1864                 break;
1865         case SIOCSIFADDR:
1866         case SIOCAIPXITFCRT:
1867         case SIOCAIPXPRISLT:
1868                 rc = -EPERM;
1869                 if (!capable(CAP_NET_ADMIN))
1870                         break;
1871         case SIOCGIFADDR:
1872                 rc = ipxitf_ioctl(cmd, argp);
1873                 break;
1874         case SIOCIPXCFGDATA:
1875                 rc = ipxcfg_get_config_data(argp);
1876                 break;
1877         case SIOCIPXNCPCONN:
1878                 /*
1879                  * This socket wants to take care of the NCP connection
1880                  * handed to us in arg.
1881                  */
1882                 rc = -EPERM;
1883                 if (!capable(CAP_NET_ADMIN))
1884                         break;
1885                 rc = get_user(ipx_sk(sk)->ipx_ncp_conn,
1886                               (const unsigned short __user *)argp);
1887                 break;
1888         case SIOCGSTAMP:
1889                 rc = sock_get_timestamp(sk, argp);
1890                 break;
1891         case SIOCGIFDSTADDR:
1892         case SIOCSIFDSTADDR:
1893         case SIOCGIFBRDADDR:
1894         case SIOCSIFBRDADDR:
1895         case SIOCGIFNETMASK:
1896         case SIOCSIFNETMASK:
1897                 rc = -EINVAL;
1898                 break;
1899         default:
1900                 rc = -ENOIOCTLCMD;
1901                 break;
1902         }
1903         release_sock(sk);
1904 
1905         return rc;
1906 }
1907 
1908 
1909 #ifdef CONFIG_COMPAT
1910 static int ipx_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1911 {
1912         /*
1913          * These 4 commands use same structure on 32bit and 64bit.  Rest of IPX
1914          * commands is handled by generic ioctl code.  As these commands are
1915          * SIOCPROTOPRIVATE..SIOCPROTOPRIVATE+3, they cannot be handled by generic
1916          * code.
1917          */
1918         switch (cmd) {
1919         case SIOCAIPXITFCRT:
1920         case SIOCAIPXPRISLT:
1921         case SIOCIPXCFGDATA:
1922         case SIOCIPXNCPCONN:
1923                 return ipx_ioctl(sock, cmd, arg);
1924         default:
1925                 return -ENOIOCTLCMD;
1926         }
1927 }
1928 #endif
1929 
1930 static int ipx_shutdown(struct socket *sock, int mode)
1931 {
1932         struct sock *sk = sock->sk;
1933 
1934         if (mode < SHUT_RD || mode > SHUT_RDWR)
1935                 return -EINVAL;
1936         /* This maps:
1937          * SHUT_RD   (0) -> RCV_SHUTDOWN  (1)
1938          * SHUT_WR   (1) -> SEND_SHUTDOWN (2)
1939          * SHUT_RDWR (2) -> SHUTDOWN_MASK (3)
1940          */
1941         ++mode;
1942 
1943         lock_sock(sk);
1944         sk->sk_shutdown |= mode;
1945         release_sock(sk);
1946         sk->sk_state_change(sk);
1947 
1948         return 0;
1949 }
1950 
1951 /*
1952  * Socket family declarations
1953  */
1954 
1955 static const struct net_proto_family ipx_family_ops = {
1956         .family         = PF_IPX,
1957         .create         = ipx_create,
1958         .owner          = THIS_MODULE,
1959 };
1960 
1961 static const struct proto_ops ipx_dgram_ops = {
1962         .family         = PF_IPX,
1963         .owner          = THIS_MODULE,
1964         .release        = ipx_release,
1965         .bind           = ipx_bind,
1966         .connect        = ipx_connect,
1967         .socketpair     = sock_no_socketpair,
1968         .accept         = sock_no_accept,
1969         .getname        = ipx_getname,
1970         .poll           = datagram_poll,
1971         .ioctl          = ipx_ioctl,
1972 #ifdef CONFIG_COMPAT
1973         .compat_ioctl   = ipx_compat_ioctl,
1974 #endif
1975         .listen         = sock_no_listen,
1976         .shutdown       = ipx_shutdown,
1977         .setsockopt     = ipx_setsockopt,
1978         .getsockopt     = ipx_getsockopt,
1979         .sendmsg        = ipx_sendmsg,
1980         .recvmsg        = ipx_recvmsg,
1981         .mmap           = sock_no_mmap,
1982         .sendpage       = sock_no_sendpage,
1983 };
1984 
1985 static struct packet_type ipx_8023_packet_type __read_mostly = {
1986         .type           = cpu_to_be16(ETH_P_802_3),
1987         .func           = ipx_rcv,
1988 };
1989 
1990 static struct packet_type ipx_dix_packet_type __read_mostly = {
1991         .type           = cpu_to_be16(ETH_P_IPX),
1992         .func           = ipx_rcv,
1993 };
1994 
1995 static struct notifier_block ipx_dev_notifier = {
1996         .notifier_call  = ipxitf_device_event,
1997 };
1998 
1999 static const unsigned char ipx_8022_type = 0xE0;
2000 static const unsigned char ipx_snap_id[5] = { 0x0, 0x0, 0x0, 0x81, 0x37 };
2001 static const char ipx_EII_err_msg[] __initconst =
2002         KERN_CRIT "IPX: Unable to register with Ethernet II\n";
2003 static const char ipx_8023_err_msg[] __initconst =
2004         KERN_CRIT "IPX: Unable to register with 802.3\n";
2005 static const char ipx_llc_err_msg[] __initconst =
2006         KERN_CRIT "IPX: Unable to register with 802.2\n";
2007 static const char ipx_snap_err_msg[] __initconst =
2008         KERN_CRIT "IPX: Unable to register with SNAP\n";
2009 
2010 static int __init ipx_init(void)
2011 {
2012         int rc = proto_register(&ipx_proto, 1);
2013 
2014         if (rc != 0)
2015                 goto out;
2016 
2017         sock_register(&ipx_family_ops);
2018 
2019         pEII_datalink = make_EII_client();
2020         if (pEII_datalink)
2021                 dev_add_pack(&ipx_dix_packet_type);
2022         else
2023                 printk(ipx_EII_err_msg);
2024 
2025         p8023_datalink = make_8023_client();
2026         if (p8023_datalink)
2027                 dev_add_pack(&ipx_8023_packet_type);
2028         else
2029                 printk(ipx_8023_err_msg);
2030 
2031         p8022_datalink = register_8022_client(ipx_8022_type, ipx_rcv);
2032         if (!p8022_datalink)
2033                 printk(ipx_llc_err_msg);
2034 
2035         pSNAP_datalink = register_snap_client(ipx_snap_id, ipx_rcv);
2036         if (!pSNAP_datalink)
2037                 printk(ipx_snap_err_msg);
2038 
2039         register_netdevice_notifier(&ipx_dev_notifier);
2040         ipx_register_sysctl();
2041         ipx_proc_init();
2042 out:
2043         return rc;
2044 }
2045 
2046 static void __exit ipx_proto_finito(void)
2047 {
2048         ipx_proc_exit();
2049         ipx_unregister_sysctl();
2050 
2051         unregister_netdevice_notifier(&ipx_dev_notifier);
2052 
2053         ipxitf_cleanup();
2054 
2055         if (pSNAP_datalink) {
2056                 unregister_snap_client(pSNAP_datalink);
2057                 pSNAP_datalink = NULL;
2058         }
2059 
2060         if (p8022_datalink) {
2061                 unregister_8022_client(p8022_datalink);
2062                 p8022_datalink = NULL;
2063         }
2064 
2065         dev_remove_pack(&ipx_8023_packet_type);
2066         if (p8023_datalink) {
2067                 destroy_8023_client(p8023_datalink);
2068                 p8023_datalink = NULL;
2069         }
2070 
2071         dev_remove_pack(&ipx_dix_packet_type);
2072         if (pEII_datalink) {
2073                 destroy_EII_client(pEII_datalink);
2074                 pEII_datalink = NULL;
2075         }
2076 
2077         proto_unregister(&ipx_proto);
2078         sock_unregister(ipx_family_ops.family);
2079 }
2080 
2081 module_init(ipx_init);
2082 module_exit(ipx_proto_finito);
2083 MODULE_LICENSE("GPL");
2084 MODULE_ALIAS_NETPROTO(PF_IPX);
2085 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp