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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * NET3: Token ring device handling subroutines
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Fixes: 3 Feb 97 Paul Norton <pnorton@cts.com> Minor routing fixes.
10 * Added rif table to /proc/net/tr_rif and rif timeout to
11 * /proc/sys/net/token-ring/rif_timeout.
12 * 22 Jun 98 Paul Norton <p.norton@computer.org> Rearranged
13 * tr_header and tr_type_trans to handle passing IPX SNAP and
14 * 802.2 through the correct layers. Eliminated tr_reformat.
15 *
16 */
17
18#include <asm/uaccess.h>
19#include <asm/system.h>
20#include <linux/config.h>
21#include <linux/module.h>
22#include <linux/types.h>
23#include <linux/kernel.h>
24#include <linux/jiffies.h>
25#include <linux/string.h>
26#include <linux/mm.h>
27#include <linux/socket.h>
28#include <linux/in.h>
29#include <linux/inet.h>
30#include <linux/netdevice.h>
31#include <linux/trdevice.h>
32#include <linux/skbuff.h>
33#include <linux/errno.h>
34#include <linux/timer.h>
35#include <linux/net.h>
36#include <linux/proc_fs.h>
37#include <linux/seq_file.h>
38#include <linux/init.h>
39#include <net/arp.h>
40
41static void tr_add_rif_info(struct trh_hdr *trh, struct net_device *dev);
42static void rif_check_expire(unsigned long dummy);
43
44#define TR_SR_DEBUG 0
45
46/*
47 * Each RIF entry we learn is kept this way
48 */
49
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -070050struct rif_cache {
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 unsigned char addr[TR_ALEN];
52 int iface;
Alexey Dobriyanc6b33652005-05-26 12:59:05 -070053 __be16 rcf;
54 __be16 rseg[8];
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -070055 struct rif_cache *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 unsigned long last_used;
57 unsigned char local_ring;
58};
59
60#define RIF_TABLE_SIZE 32
61
62/*
63 * We hash the RIF cache 32 ways. We do after all have to look it
64 * up a lot.
65 */
66
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -070067static struct rif_cache *rif_table[RIF_TABLE_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
69static DEFINE_SPINLOCK(rif_lock);
70
71
72/*
73 * Garbage disposal timer.
74 */
75
76static struct timer_list rif_timer;
77
78int sysctl_tr_rif_timeout = 60*10*HZ;
79
80static inline unsigned long rif_hash(const unsigned char *addr)
81{
82 unsigned long x;
83
84 x = addr[0];
85 x = (x << 2) ^ addr[1];
86 x = (x << 2) ^ addr[2];
87 x = (x << 2) ^ addr[3];
88 x = (x << 2) ^ addr[4];
89 x = (x << 2) ^ addr[5];
90
91 x ^= x >> 8;
92
93 return x & (RIF_TABLE_SIZE - 1);
94}
95
96/*
97 * Put the headers on a token ring packet. Token ring source routing
98 * makes this a little more exciting than on ethernet.
99 */
100
101static int tr_header(struct sk_buff *skb, struct net_device *dev,
102 unsigned short type,
103 void *daddr, void *saddr, unsigned len)
104{
105 struct trh_hdr *trh;
106 int hdr_len;
107
108 /*
109 * Add the 802.2 SNAP header if IP as the IPv4/IPv6 code calls
110 * dev->hard_header directly.
111 */
112 if (type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
113 {
114 struct trllc *trllc;
115
116 hdr_len = sizeof(struct trh_hdr) + sizeof(struct trllc);
117 trh = (struct trh_hdr *)skb_push(skb, hdr_len);
118 trllc = (struct trllc *)(trh+1);
119 trllc->dsap = trllc->ssap = EXTENDED_SAP;
120 trllc->llc = UI_CMD;
121 trllc->protid[0] = trllc->protid[1] = trllc->protid[2] = 0x00;
122 trllc->ethertype = htons(type);
123 }
124 else
125 {
126 hdr_len = sizeof(struct trh_hdr);
127 trh = (struct trh_hdr *)skb_push(skb, hdr_len);
128 }
129
130 trh->ac=AC;
131 trh->fc=LLC_FRAME;
132
133 if(saddr)
134 memcpy(trh->saddr,saddr,dev->addr_len);
135 else
136 memcpy(trh->saddr,dev->dev_addr,dev->addr_len);
137
138 /*
139 * Build the destination and then source route the frame
140 */
141
142 if(daddr)
143 {
144 memcpy(trh->daddr,daddr,dev->addr_len);
145 tr_source_route(skb,trh,dev);
146 return(hdr_len);
147 }
148
149 return -hdr_len;
150}
151
152/*
153 * A neighbour discovery of some species (eg arp) has completed. We
154 * can now send the packet.
155 */
156
157static int tr_rebuild_header(struct sk_buff *skb)
158{
159 struct trh_hdr *trh=(struct trh_hdr *)skb->data;
160 struct trllc *trllc=(struct trllc *)(skb->data+sizeof(struct trh_hdr));
161 struct net_device *dev = skb->dev;
162
163 /*
164 * FIXME: We don't yet support IPv6 over token rings
165 */
166
167 if(trllc->ethertype != htons(ETH_P_IP)) {
168 printk("tr_rebuild_header: Don't know how to resolve type %04X addresses ?\n",(unsigned int)htons(trllc->ethertype));
169 return 0;
170 }
171
172#ifdef CONFIG_INET
173 if(arp_find(trh->daddr, skb)) {
174 return 1;
175 }
176 else
177#endif
178 {
179 tr_source_route(skb,trh,dev);
180 return 0;
181 }
182}
183
184/*
185 * Some of this is a bit hackish. We intercept RIF information
186 * used for source routing. We also grab IP directly and don't feed
187 * it via SNAP.
188 */
189
190unsigned short tr_type_trans(struct sk_buff *skb, struct net_device *dev)
191{
192
193 struct trh_hdr *trh=(struct trh_hdr *)skb->data;
194 struct trllc *trllc;
195 unsigned riflen=0;
196
197 skb->mac.raw = skb->data;
198
199 if(trh->saddr[0] & TR_RII)
200 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
201
202 trllc = (struct trllc *)(skb->data+sizeof(struct trh_hdr)-TR_MAXRIFLEN+riflen);
203
204 skb_pull(skb,sizeof(struct trh_hdr)-TR_MAXRIFLEN+riflen);
205
206 if(*trh->daddr & 0x80)
207 {
208 if(!memcmp(trh->daddr,dev->broadcast,TR_ALEN))
209 skb->pkt_type=PACKET_BROADCAST;
210 else
211 skb->pkt_type=PACKET_MULTICAST;
212 }
213 else if ( (trh->daddr[0] & 0x01) && (trh->daddr[1] & 0x00) && (trh->daddr[2] & 0x5E))
214 {
215 skb->pkt_type=PACKET_MULTICAST;
216 }
217 else if(dev->flags & IFF_PROMISC)
218 {
219 if(memcmp(trh->daddr, dev->dev_addr, TR_ALEN))
220 skb->pkt_type=PACKET_OTHERHOST;
221 }
222
223 if ((skb->pkt_type != PACKET_BROADCAST) &&
224 (skb->pkt_type != PACKET_MULTICAST))
225 tr_add_rif_info(trh,dev) ;
226
227 /*
228 * Strip the SNAP header from ARP packets since we don't
229 * pass them through to the 802.2/SNAP layers.
230 */
231
232 if (trllc->dsap == EXTENDED_SAP &&
233 (trllc->ethertype == ntohs(ETH_P_IP) ||
234 trllc->ethertype == ntohs(ETH_P_IPV6) ||
235 trllc->ethertype == ntohs(ETH_P_ARP)))
236 {
237 skb_pull(skb, sizeof(struct trllc));
238 return trllc->ethertype;
239 }
240
Jochen Friedrich0519d8f2005-09-22 04:51:56 -0300241 return ntohs(ETH_P_TR_802_2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242}
243
244/*
245 * We try to do source routing...
246 */
247
248void tr_source_route(struct sk_buff *skb,struct trh_hdr *trh,struct net_device *dev)
249{
250 int slack;
251 unsigned int hash;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700252 struct rif_cache *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 unsigned char *olddata;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700254 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 static const unsigned char mcast_func_addr[]
256 = {0xC0,0x00,0x00,0x04,0x00,0x00};
257
Jay Vosburgh001dd252005-08-18 14:04:51 -0700258 spin_lock_irqsave(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
260 /*
261 * Broadcasts are single route as stated in RFC 1042
262 */
263 if( (!memcmp(&(trh->daddr[0]),&(dev->broadcast[0]),TR_ALEN)) ||
264 (!memcmp(&(trh->daddr[0]),&(mcast_func_addr[0]), TR_ALEN)) )
265 {
266 trh->rcf=htons((((sizeof(trh->rcf)) << 8) & TR_RCF_LEN_MASK)
267 | TR_RCF_FRAME2K | TR_RCF_LIMITED_BROADCAST);
268 trh->saddr[0]|=TR_RII;
269 }
270 else
271 {
272 hash = rif_hash(trh->daddr);
273 /*
274 * Walk the hash table and look for an entry
275 */
276 for(entry=rif_table[hash];entry && memcmp(&(entry->addr[0]),&(trh->daddr[0]),TR_ALEN);entry=entry->next);
277
278 /*
279 * If we found an entry we can route the frame.
280 */
281 if(entry)
282 {
283#if TR_SR_DEBUG
284printk("source routing for %02X:%02X:%02X:%02X:%02X:%02X\n",trh->daddr[0],
285 trh->daddr[1],trh->daddr[2],trh->daddr[3],trh->daddr[4],trh->daddr[5]);
286#endif
287 if(!entry->local_ring && (ntohs(entry->rcf) & TR_RCF_LEN_MASK) >> 8)
288 {
289 trh->rcf=entry->rcf;
290 memcpy(&trh->rseg[0],&entry->rseg[0],8*sizeof(unsigned short));
291 trh->rcf^=htons(TR_RCF_DIR_BIT);
292 trh->rcf&=htons(0x1fff); /* Issam Chehab <ichehab@madge1.demon.co.uk> */
293
294 trh->saddr[0]|=TR_RII;
295#if TR_SR_DEBUG
296 printk("entry found with rcf %04x\n", entry->rcf);
297 }
298 else
299 {
300 printk("entry found but without rcf length, local=%02x\n", entry->local_ring);
301#endif
302 }
303 entry->last_used=jiffies;
304 }
305 else
306 {
307 /*
308 * Without the information we simply have to shout
309 * on the wire. The replies should rapidly clean this
310 * situation up.
311 */
312 trh->rcf=htons((((sizeof(trh->rcf)) << 8) & TR_RCF_LEN_MASK)
313 | TR_RCF_FRAME2K | TR_RCF_LIMITED_BROADCAST);
314 trh->saddr[0]|=TR_RII;
315#if TR_SR_DEBUG
316 printk("no entry in rif table found - broadcasting frame\n");
317#endif
318 }
319 }
320
321 /* Compress the RIF here so we don't have to do it in the driver(s) */
322 if (!(trh->saddr[0] & 0x80))
323 slack = 18;
324 else
325 slack = 18 - ((ntohs(trh->rcf) & TR_RCF_LEN_MASK)>>8);
326 olddata = skb->data;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700327 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
329 skb_pull(skb, slack);
330 memmove(skb->data, olddata, sizeof(struct trh_hdr) - slack);
331}
332
333/*
334 * We have learned some new RIF information for our source
335 * routing.
336 */
337
338static void tr_add_rif_info(struct trh_hdr *trh, struct net_device *dev)
339{
340 unsigned int hash, rii_p = 0;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700341 unsigned long flags;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700342 struct rif_cache *entry;
Jochen Friedrich5ac660e2005-10-23 10:31:45 +0200343 unsigned char saddr0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
Jay Vosburgh001dd252005-08-18 14:04:51 -0700345 spin_lock_irqsave(&rif_lock, flags);
Jochen Friedrich5ac660e2005-10-23 10:31:45 +0200346 saddr0 = trh->saddr[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
348 /*
349 * Firstly see if the entry exists
350 */
351
352 if(trh->saddr[0] & TR_RII)
353 {
354 trh->saddr[0]&=0x7f;
355 if (((ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8) > 2)
356 {
357 rii_p = 1;
358 }
359 }
360
361 hash = rif_hash(trh->saddr);
362 for(entry=rif_table[hash];entry && memcmp(&(entry->addr[0]),&(trh->saddr[0]),TR_ALEN);entry=entry->next);
363
364 if(entry==NULL)
365 {
366#if TR_SR_DEBUG
367printk("adding rif_entry: addr:%02X:%02X:%02X:%02X:%02X:%02X rcf:%04X\n",
368 trh->saddr[0],trh->saddr[1],trh->saddr[2],
369 trh->saddr[3],trh->saddr[4],trh->saddr[5],
370 ntohs(trh->rcf));
371#endif
372 /*
373 * Allocate our new entry. A failure to allocate loses
374 * use the information. This is harmless.
375 *
376 * FIXME: We ought to keep some kind of cache size
377 * limiting and adjust the timers to suit.
378 */
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700379 entry=kmalloc(sizeof(struct rif_cache),GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
381 if(!entry)
382 {
383 printk(KERN_DEBUG "tr.c: Couldn't malloc rif cache entry !\n");
Jay Vosburgh001dd252005-08-18 14:04:51 -0700384 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 return;
386 }
387
388 memcpy(&(entry->addr[0]),&(trh->saddr[0]),TR_ALEN);
389 entry->iface = dev->ifindex;
390 entry->next=rif_table[hash];
391 entry->last_used=jiffies;
392 rif_table[hash]=entry;
393
394 if (rii_p)
395 {
396 entry->rcf = trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK);
397 memcpy(&(entry->rseg[0]),&(trh->rseg[0]),8*sizeof(unsigned short));
398 entry->local_ring = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 }
400 else
401 {
402 entry->local_ring = 1;
403 }
404 }
405 else /* Y. Tahara added */
406 {
407 /*
408 * Update existing entries
409 */
410 if (!entry->local_ring)
411 if (entry->rcf != (trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK)) &&
412 !(trh->rcf & htons(TR_RCF_BROADCAST_MASK)))
413 {
414#if TR_SR_DEBUG
415printk("updating rif_entry: addr:%02X:%02X:%02X:%02X:%02X:%02X rcf:%04X\n",
416 trh->saddr[0],trh->saddr[1],trh->saddr[2],
417 trh->saddr[3],trh->saddr[4],trh->saddr[5],
418 ntohs(trh->rcf));
419#endif
420 entry->rcf = trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK);
421 memcpy(&(entry->rseg[0]),&(trh->rseg[0]),8*sizeof(unsigned short));
422 }
423 entry->last_used=jiffies;
424 }
Jochen Friedrich5ac660e2005-10-23 10:31:45 +0200425 trh->saddr[0]=saddr0; /* put the routing indicator back for tcpdump */
Jay Vosburgh001dd252005-08-18 14:04:51 -0700426 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427}
428
429/*
430 * Scan the cache with a timer and see what we need to throw out.
431 */
432
433static void rif_check_expire(unsigned long dummy)
434{
435 int i;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700436 unsigned long flags, next_interval = jiffies + sysctl_tr_rif_timeout/2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
Jay Vosburgh001dd252005-08-18 14:04:51 -0700438 spin_lock_irqsave(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
440 for(i =0; i < RIF_TABLE_SIZE; i++) {
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700441 struct rif_cache *entry, **pentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443 pentry = rif_table+i;
444 while((entry=*pentry) != NULL) {
445 unsigned long expires
446 = entry->last_used + sysctl_tr_rif_timeout;
447
448 if (time_before_eq(expires, jiffies)) {
449 *pentry = entry->next;
450 kfree(entry);
451 } else {
452 pentry = &entry->next;
453
454 if (time_before(expires, next_interval))
455 next_interval = expires;
456 }
457 }
458 }
459
Jay Vosburgh001dd252005-08-18 14:04:51 -0700460 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
462 mod_timer(&rif_timer, next_interval);
463
464}
465
466/*
467 * Generate the /proc/net information for the token ring RIF
468 * routing.
469 */
470
471#ifdef CONFIG_PROC_FS
472
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700473static struct rif_cache *rif_get_idx(loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474{
475 int i;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700476 struct rif_cache *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 loff_t off = 0;
478
479 for(i = 0; i < RIF_TABLE_SIZE; i++)
480 for(entry = rif_table[i]; entry; entry = entry->next) {
481 if (off == pos)
482 return entry;
483 ++off;
484 }
485
486 return NULL;
487}
488
489static void *rif_seq_start(struct seq_file *seq, loff_t *pos)
490{
Jay Vosburgh001dd252005-08-18 14:04:51 -0700491 spin_lock_irq(&rif_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
493 return *pos ? rif_get_idx(*pos - 1) : SEQ_START_TOKEN;
494}
495
496static void *rif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
497{
498 int i;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700499 struct rif_cache *ent = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
501 ++*pos;
502
503 if (v == SEQ_START_TOKEN) {
504 i = -1;
505 goto scan;
506 }
507
508 if (ent->next)
509 return ent->next;
510
511 i = rif_hash(ent->addr);
512 scan:
513 while (++i < RIF_TABLE_SIZE) {
514 if ((ent = rif_table[i]) != NULL)
515 return ent;
516 }
517 return NULL;
518}
519
520static void rif_seq_stop(struct seq_file *seq, void *v)
521{
Jay Vosburgh001dd252005-08-18 14:04:51 -0700522 spin_unlock_irq(&rif_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523}
524
525static int rif_seq_show(struct seq_file *seq, void *v)
526{
527 int j, rcf_len, segment, brdgnmb;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700528 struct rif_cache *entry = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
530 if (v == SEQ_START_TOKEN)
531 seq_puts(seq,
532 "if TR address TTL rcf routing segments\n");
533 else {
534 struct net_device *dev = dev_get_by_index(entry->iface);
535 long ttl = (long) (entry->last_used + sysctl_tr_rif_timeout)
536 - (long) jiffies;
537
538 seq_printf(seq, "%s %02X:%02X:%02X:%02X:%02X:%02X %7li ",
539 dev?dev->name:"?",
540 entry->addr[0],entry->addr[1],entry->addr[2],
541 entry->addr[3],entry->addr[4],entry->addr[5],
542 ttl/HZ);
543
544 if (entry->local_ring)
545 seq_puts(seq, "local\n");
546 else {
547
548 seq_printf(seq, "%04X", ntohs(entry->rcf));
549 rcf_len = ((ntohs(entry->rcf) & TR_RCF_LEN_MASK)>>8)-2;
550 if (rcf_len)
551 rcf_len >>= 1;
552 for(j = 1; j < rcf_len; j++) {
553 if(j==1) {
554 segment=ntohs(entry->rseg[j-1])>>4;
555 seq_printf(seq," %03X",segment);
556 };
557 segment=ntohs(entry->rseg[j])>>4;
558 brdgnmb=ntohs(entry->rseg[j-1])&0x00f;
559 seq_printf(seq,"-%01X-%03X",brdgnmb,segment);
560 }
561 seq_putc(seq, '\n');
562 }
563 }
564 return 0;
565}
566
567
568static struct seq_operations rif_seq_ops = {
569 .start = rif_seq_start,
570 .next = rif_seq_next,
571 .stop = rif_seq_stop,
572 .show = rif_seq_show,
573};
574
575static int rif_seq_open(struct inode *inode, struct file *file)
576{
577 return seq_open(file, &rif_seq_ops);
578}
579
580static struct file_operations rif_seq_fops = {
581 .owner = THIS_MODULE,
582 .open = rif_seq_open,
583 .read = seq_read,
584 .llseek = seq_lseek,
585 .release = seq_release,
586};
587
588#endif
589
590static void tr_setup(struct net_device *dev)
591{
592 /*
593 * Configure and register
594 */
595
596 dev->hard_header = tr_header;
597 dev->rebuild_header = tr_rebuild_header;
598
599 dev->type = ARPHRD_IEEE802_TR;
600 dev->hard_header_len = TR_HLEN;
601 dev->mtu = 2000;
602 dev->addr_len = TR_ALEN;
603 dev->tx_queue_len = 100; /* Long queues on tr */
604
605 memset(dev->broadcast,0xFF, TR_ALEN);
606
607 /* New-style flags. */
608 dev->flags = IFF_BROADCAST | IFF_MULTICAST ;
609}
610
611/**
612 * alloc_trdev - Register token ring device
613 * @sizeof_priv: Size of additional driver-private structure to be allocated
614 * for this token ring device
615 *
616 * Fill in the fields of the device structure with token ring-generic values.
617 *
618 * Constructs a new net device, complete with a private data area of
619 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
620 * this private data area.
621 */
622struct net_device *alloc_trdev(int sizeof_priv)
623{
624 return alloc_netdev(sizeof_priv, "tr%d", tr_setup);
625}
626
627/*
628 * Called during bootup. We don't actually have to initialise
629 * too much for this.
630 */
631
632static int __init rif_init(void)
633{
634 init_timer(&rif_timer);
635 rif_timer.expires = sysctl_tr_rif_timeout;
636 rif_timer.data = 0L;
637 rif_timer.function = rif_check_expire;
638 add_timer(&rif_timer);
639
640 proc_net_fops_create("tr_rif", S_IRUGO, &rif_seq_fops);
641 return 0;
642}
643
644module_init(rif_init);
645
646EXPORT_SYMBOL(tr_source_route);
647EXPORT_SYMBOL(tr_type_trans);
648EXPORT_SYMBOL(alloc_trdev);