blob: e56e61a7f5450ad783aa92a510dafab0a7309069 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * NET3: Token ring device handling subroutines
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +09003 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * 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.
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +090015 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 */
17
18#include <asm/uaccess.h>
19#include <asm/system.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/kernel.h>
23#include <linux/jiffies.h>
24#include <linux/string.h>
25#include <linux/mm.h>
26#include <linux/socket.h>
27#include <linux/in.h>
28#include <linux/inet.h>
29#include <linux/netdevice.h>
30#include <linux/trdevice.h>
31#include <linux/skbuff.h>
32#include <linux/errno.h>
33#include <linux/timer.h>
34#include <linux/net.h>
35#include <linux/proc_fs.h>
36#include <linux/seq_file.h>
37#include <linux/init.h>
38#include <net/arp.h>
39
40static void tr_add_rif_info(struct trh_hdr *trh, struct net_device *dev);
41static void rif_check_expire(unsigned long dummy);
42
43#define TR_SR_DEBUG 0
44
45/*
46 * Each RIF entry we learn is kept this way
47 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +090048
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -070049struct rif_cache {
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 unsigned char addr[TR_ALEN];
51 int iface;
Alexey Dobriyanc6b33652005-05-26 12:59:05 -070052 __be16 rcf;
53 __be16 rseg[8];
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -070054 struct rif_cache *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 unsigned long last_used;
56 unsigned char local_ring;
57};
58
59#define RIF_TABLE_SIZE 32
60
61/*
62 * We hash the RIF cache 32 ways. We do after all have to look it
63 * up a lot.
64 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +090065
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -070066static struct rif_cache *rif_table[RIF_TABLE_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68static DEFINE_SPINLOCK(rif_lock);
69
70
71/*
72 * Garbage disposal timer.
73 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +090074
Linus Torvalds1da177e2005-04-16 15:20:36 -070075static struct timer_list rif_timer;
76
77int sysctl_tr_rif_timeout = 60*10*HZ;
78
79static inline unsigned long rif_hash(const unsigned char *addr)
80{
81 unsigned long x;
82
83 x = addr[0];
84 x = (x << 2) ^ addr[1];
85 x = (x << 2) ^ addr[2];
86 x = (x << 2) ^ addr[3];
87 x = (x << 2) ^ addr[4];
88 x = (x << 2) ^ addr[5];
89
90 x ^= x >> 8;
91
92 return x & (RIF_TABLE_SIZE - 1);
93}
94
95/*
96 * Put the headers on a token ring packet. Token ring source routing
97 * makes this a little more exciting than on ethernet.
98 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +090099
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100static int tr_header(struct sk_buff *skb, struct net_device *dev,
101 unsigned short type,
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900102 void *daddr, void *saddr, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103{
104 struct trh_hdr *trh;
105 int hdr_len;
106
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900107 /*
108 * Add the 802.2 SNAP header if IP as the IPv4/IPv6 code calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 * dev->hard_header directly.
110 */
111 if (type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
112 {
113 struct trllc *trllc;
114
115 hdr_len = sizeof(struct trh_hdr) + sizeof(struct trllc);
116 trh = (struct trh_hdr *)skb_push(skb, hdr_len);
117 trllc = (struct trllc *)(trh+1);
118 trllc->dsap = trllc->ssap = EXTENDED_SAP;
119 trllc->llc = UI_CMD;
120 trllc->protid[0] = trllc->protid[1] = trllc->protid[2] = 0x00;
121 trllc->ethertype = htons(type);
122 }
123 else
124 {
125 hdr_len = sizeof(struct trh_hdr);
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900126 trh = (struct trh_hdr *)skb_push(skb, hdr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 }
128
129 trh->ac=AC;
130 trh->fc=LLC_FRAME;
131
132 if(saddr)
133 memcpy(trh->saddr,saddr,dev->addr_len);
134 else
135 memcpy(trh->saddr,dev->dev_addr,dev->addr_len);
136
137 /*
138 * Build the destination and then source route the frame
139 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900140
141 if(daddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 {
143 memcpy(trh->daddr,daddr,dev->addr_len);
144 tr_source_route(skb,trh,dev);
145 return(hdr_len);
146 }
147
148 return -hdr_len;
149}
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151/*
152 * A neighbour discovery of some species (eg arp) has completed. We
153 * can now send the packet.
154 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900155
156static int tr_rebuild_header(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157{
158 struct trh_hdr *trh=(struct trh_hdr *)skb->data;
159 struct trllc *trllc=(struct trllc *)(skb->data+sizeof(struct trh_hdr));
160 struct net_device *dev = skb->dev;
161
162 /*
163 * FIXME: We don't yet support IPv6 over token rings
164 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 if(trllc->ethertype != htons(ETH_P_IP)) {
Al Viro0ac07602006-09-26 21:23:16 -0700167 printk("tr_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(trllc->ethertype));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 return 0;
169 }
170
171#ifdef CONFIG_INET
172 if(arp_find(trh->daddr, skb)) {
173 return 1;
174 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900175 else
176#endif
177 {
178 tr_source_route(skb,trh,dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 return 0;
180 }
181}
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900182
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183/*
184 * Some of this is a bit hackish. We intercept RIF information
185 * used for source routing. We also grab IP directly and don't feed
186 * it via SNAP.
187 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900188
Al Viro0ac07602006-09-26 21:23:16 -0700189__be16 tr_type_trans(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
191
Arnaldo Carvalho de Meloc1a4b862007-03-19 15:27:07 -0700192 struct trh_hdr *trh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 struct trllc *trllc;
194 unsigned riflen=0;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900195
Arnaldo Carvalho de Meloc8fb7942007-03-19 15:29:16 -0700196 skb->dev = dev;
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700197 skb_reset_mac_header(skb);
Arnaldo Carvalho de Meloc1a4b862007-03-19 15:27:07 -0700198 trh = tr_hdr(skb);
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900199
200 if(trh->saddr[0] & TR_RII)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
202
203 trllc = (struct trllc *)(skb->data+sizeof(struct trh_hdr)-TR_MAXRIFLEN+riflen);
204
205 skb_pull(skb,sizeof(struct trh_hdr)-TR_MAXRIFLEN+riflen);
206
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900207 if(*trh->daddr & 0x80)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 {
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900209 if(!memcmp(trh->daddr,dev->broadcast,TR_ALEN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 skb->pkt_type=PACKET_BROADCAST;
211 else
212 skb->pkt_type=PACKET_MULTICAST;
213 }
214 else if ( (trh->daddr[0] & 0x01) && (trh->daddr[1] & 0x00) && (trh->daddr[2] & 0x5E))
215 {
216 skb->pkt_type=PACKET_MULTICAST;
217 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900218 else if(dev->flags & IFF_PROMISC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 {
220 if(memcmp(trh->daddr, dev->dev_addr, TR_ALEN))
221 skb->pkt_type=PACKET_OTHERHOST;
222 }
223
224 if ((skb->pkt_type != PACKET_BROADCAST) &&
225 (skb->pkt_type != PACKET_MULTICAST))
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900226 tr_add_rif_info(trh,dev) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 /*
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900229 * Strip the SNAP header from ARP packets since we don't
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 * pass them through to the 802.2/SNAP layers.
231 */
232
233 if (trllc->dsap == EXTENDED_SAP &&
Al Viro0ac07602006-09-26 21:23:16 -0700234 (trllc->ethertype == htons(ETH_P_IP) ||
235 trllc->ethertype == htons(ETH_P_IPV6) ||
236 trllc->ethertype == htons(ETH_P_ARP)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 {
238 skb_pull(skb, sizeof(struct trllc));
239 return trllc->ethertype;
240 }
241
Al Viro0ac07602006-09-26 21:23:16 -0700242 return htons(ETH_P_TR_802_2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243}
244
245/*
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900246 * We try to do source routing...
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 */
248
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900249void tr_source_route(struct sk_buff *skb,struct trh_hdr *trh,struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250{
251 int slack;
252 unsigned int hash;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700253 struct rif_cache *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 unsigned char *olddata;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700255 unsigned long flags;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900256 static const unsigned char mcast_func_addr[]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 = {0xC0,0x00,0x00,0x04,0x00,0x00};
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900258
Jay Vosburgh001dd252005-08-18 14:04:51 -0700259 spin_lock_irqsave(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
261 /*
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900262 * Broadcasts are single route as stated in RFC 1042
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 */
264 if( (!memcmp(&(trh->daddr[0]),&(dev->broadcast[0]),TR_ALEN)) ||
265 (!memcmp(&(trh->daddr[0]),&(mcast_func_addr[0]), TR_ALEN)) )
266 {
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900267 trh->rcf=htons((((sizeof(trh->rcf)) << 8) & TR_RCF_LEN_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 | TR_RCF_FRAME2K | TR_RCF_LIMITED_BROADCAST);
269 trh->saddr[0]|=TR_RII;
270 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900271 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 {
273 hash = rif_hash(trh->daddr);
274 /*
275 * Walk the hash table and look for an entry
276 */
277 for(entry=rif_table[hash];entry && memcmp(&(entry->addr[0]),&(trh->daddr[0]),TR_ALEN);entry=entry->next);
278
279 /*
280 * If we found an entry we can route the frame.
281 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900282 if(entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 {
284#if TR_SR_DEBUG
285printk("source routing for %02X:%02X:%02X:%02X:%02X:%02X\n",trh->daddr[0],
286 trh->daddr[1],trh->daddr[2],trh->daddr[3],trh->daddr[4],trh->daddr[5]);
287#endif
288 if(!entry->local_ring && (ntohs(entry->rcf) & TR_RCF_LEN_MASK) >> 8)
289 {
290 trh->rcf=entry->rcf;
291 memcpy(&trh->rseg[0],&entry->rseg[0],8*sizeof(unsigned short));
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900292 trh->rcf^=htons(TR_RCF_DIR_BIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 trh->rcf&=htons(0x1fff); /* Issam Chehab <ichehab@madge1.demon.co.uk> */
294
295 trh->saddr[0]|=TR_RII;
296#if TR_SR_DEBUG
297 printk("entry found with rcf %04x\n", entry->rcf);
298 }
299 else
300 {
301 printk("entry found but without rcf length, local=%02x\n", entry->local_ring);
302#endif
303 }
304 entry->last_used=jiffies;
305 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900306 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 {
308 /*
309 * Without the information we simply have to shout
310 * on the wire. The replies should rapidly clean this
311 * situation up.
312 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900313 trh->rcf=htons((((sizeof(trh->rcf)) << 8) & TR_RCF_LEN_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 | TR_RCF_FRAME2K | TR_RCF_LIMITED_BROADCAST);
315 trh->saddr[0]|=TR_RII;
316#if TR_SR_DEBUG
317 printk("no entry in rif table found - broadcasting frame\n");
318#endif
319 }
320 }
321
322 /* Compress the RIF here so we don't have to do it in the driver(s) */
323 if (!(trh->saddr[0] & 0x80))
324 slack = 18;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900325 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 slack = 18 - ((ntohs(trh->rcf) & TR_RCF_LEN_MASK)>>8);
327 olddata = skb->data;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700328 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
330 skb_pull(skb, slack);
331 memmove(skb->data, olddata, sizeof(struct trh_hdr) - slack);
332}
333
334/*
335 * We have learned some new RIF information for our source
336 * routing.
337 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900338
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339static void tr_add_rif_info(struct trh_hdr *trh, struct net_device *dev)
340{
341 unsigned int hash, rii_p = 0;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700342 unsigned long flags;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700343 struct rif_cache *entry;
Jochen Friedrich5ac660e2005-10-23 10:31:45 +0200344 unsigned char saddr0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
Jay Vosburgh001dd252005-08-18 14:04:51 -0700346 spin_lock_irqsave(&rif_lock, flags);
Jochen Friedrich5ac660e2005-10-23 10:31:45 +0200347 saddr0 = trh->saddr[0];
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900348
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 /*
350 * Firstly see if the entry exists
351 */
352
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900353 if(trh->saddr[0] & TR_RII)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 {
355 trh->saddr[0]&=0x7f;
356 if (((ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8) > 2)
357 {
358 rii_p = 1;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900359 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 }
361
362 hash = rif_hash(trh->saddr);
363 for(entry=rif_table[hash];entry && memcmp(&(entry->addr[0]),&(trh->saddr[0]),TR_ALEN);entry=entry->next);
364
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900365 if(entry==NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 {
367#if TR_SR_DEBUG
368printk("adding rif_entry: addr:%02X:%02X:%02X:%02X:%02X:%02X rcf:%04X\n",
369 trh->saddr[0],trh->saddr[1],trh->saddr[2],
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900370 trh->saddr[3],trh->saddr[4],trh->saddr[5],
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 ntohs(trh->rcf));
372#endif
373 /*
374 * Allocate our new entry. A failure to allocate loses
375 * use the information. This is harmless.
376 *
377 * FIXME: We ought to keep some kind of cache size
378 * limiting and adjust the timers to suit.
379 */
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700380 entry=kmalloc(sizeof(struct rif_cache),GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900382 if(!entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 {
384 printk(KERN_DEBUG "tr.c: Couldn't malloc rif cache entry !\n");
Jay Vosburgh001dd252005-08-18 14:04:51 -0700385 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 return;
387 }
388
389 memcpy(&(entry->addr[0]),&(trh->saddr[0]),TR_ALEN);
390 entry->iface = dev->ifindex;
391 entry->next=rif_table[hash];
392 entry->last_used=jiffies;
393 rif_table[hash]=entry;
394
395 if (rii_p)
396 {
397 entry->rcf = trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK);
398 memcpy(&(entry->rseg[0]),&(trh->rseg[0]),8*sizeof(unsigned short));
399 entry->local_ring = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 }
401 else
402 {
403 entry->local_ring = 1;
404 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900405 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 else /* Y. Tahara added */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900407 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 /*
409 * Update existing entries
410 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900411 if (!entry->local_ring)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 if (entry->rcf != (trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK)) &&
413 !(trh->rcf & htons(TR_RCF_BROADCAST_MASK)))
414 {
415#if TR_SR_DEBUG
416printk("updating rif_entry: addr:%02X:%02X:%02X:%02X:%02X:%02X rcf:%04X\n",
417 trh->saddr[0],trh->saddr[1],trh->saddr[2],
418 trh->saddr[3],trh->saddr[4],trh->saddr[5],
419 ntohs(trh->rcf));
420#endif
421 entry->rcf = trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK);
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900422 memcpy(&(entry->rseg[0]),&(trh->rseg[0]),8*sizeof(unsigned short));
423 }
424 entry->last_used=jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 }
Jochen Friedrich5ac660e2005-10-23 10:31:45 +0200426 trh->saddr[0]=saddr0; /* put the routing indicator back for tcpdump */
Jay Vosburgh001dd252005-08-18 14:04:51 -0700427 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428}
429
430/*
431 * Scan the cache with a timer and see what we need to throw out.
432 */
433
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900434static void rif_check_expire(unsigned long dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435{
436 int i;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700437 unsigned long flags, next_interval = jiffies + sysctl_tr_rif_timeout/2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
Jay Vosburgh001dd252005-08-18 14:04:51 -0700439 spin_lock_irqsave(&rif_lock, flags);
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900440
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 for(i =0; i < RIF_TABLE_SIZE; i++) {
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700442 struct rif_cache *entry, **pentry;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900443
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 pentry = rif_table+i;
445 while((entry=*pentry) != NULL) {
446 unsigned long expires
447 = entry->last_used + sysctl_tr_rif_timeout;
448
449 if (time_before_eq(expires, jiffies)) {
450 *pentry = entry->next;
451 kfree(entry);
452 } else {
453 pentry = &entry->next;
454
455 if (time_before(expires, next_interval))
456 next_interval = expires;
457 }
458 }
459 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900460
Jay Vosburgh001dd252005-08-18 14:04:51 -0700461 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
463 mod_timer(&rif_timer, next_interval);
464
465}
466
467/*
468 * Generate the /proc/net information for the token ring RIF
469 * routing.
470 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900471
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472#ifdef CONFIG_PROC_FS
473
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700474static struct rif_cache *rif_get_idx(loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475{
476 int i;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700477 struct rif_cache *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 loff_t off = 0;
479
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900480 for(i = 0; i < RIF_TABLE_SIZE; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 for(entry = rif_table[i]; entry; entry = entry->next) {
482 if (off == pos)
483 return entry;
484 ++off;
485 }
486
487 return NULL;
488}
489
490static void *rif_seq_start(struct seq_file *seq, loff_t *pos)
491{
Jay Vosburgh001dd252005-08-18 14:04:51 -0700492 spin_lock_irq(&rif_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494 return *pos ? rif_get_idx(*pos - 1) : SEQ_START_TOKEN;
495}
496
497static void *rif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
498{
499 int i;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700500 struct rif_cache *ent = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
502 ++*pos;
503
504 if (v == SEQ_START_TOKEN) {
505 i = -1;
506 goto scan;
507 }
508
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900509 if (ent->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 return ent->next;
511
512 i = rif_hash(ent->addr);
513 scan:
514 while (++i < RIF_TABLE_SIZE) {
515 if ((ent = rif_table[i]) != NULL)
516 return ent;
517 }
518 return NULL;
519}
520
521static void rif_seq_stop(struct seq_file *seq, void *v)
522{
Jay Vosburgh001dd252005-08-18 14:04:51 -0700523 spin_unlock_irq(&rif_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524}
525
526static int rif_seq_show(struct seq_file *seq, void *v)
527{
528 int j, rcf_len, segment, brdgnmb;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700529 struct rif_cache *entry = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 if (v == SEQ_START_TOKEN)
532 seq_puts(seq,
533 "if TR address TTL rcf routing segments\n");
534 else {
535 struct net_device *dev = dev_get_by_index(entry->iface);
536 long ttl = (long) (entry->last_used + sysctl_tr_rif_timeout)
537 - (long) jiffies;
538
539 seq_printf(seq, "%s %02X:%02X:%02X:%02X:%02X:%02X %7li ",
540 dev?dev->name:"?",
541 entry->addr[0],entry->addr[1],entry->addr[2],
542 entry->addr[3],entry->addr[4],entry->addr[5],
543 ttl/HZ);
544
545 if (entry->local_ring)
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900546 seq_puts(seq, "local\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 else {
548
549 seq_printf(seq, "%04X", ntohs(entry->rcf));
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900550 rcf_len = ((ntohs(entry->rcf) & TR_RCF_LEN_MASK)>>8)-2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 if (rcf_len)
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900552 rcf_len >>= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 for(j = 1; j < rcf_len; j++) {
554 if(j==1) {
555 segment=ntohs(entry->rseg[j-1])>>4;
556 seq_printf(seq," %03X",segment);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700557 }
558
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 segment=ntohs(entry->rseg[j])>>4;
560 brdgnmb=ntohs(entry->rseg[j-1])&0x00f;
561 seq_printf(seq,"-%01X-%03X",brdgnmb,segment);
562 }
563 seq_putc(seq, '\n');
564 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900565 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 return 0;
567}
568
569
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700570static const struct seq_operations rif_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 .start = rif_seq_start,
572 .next = rif_seq_next,
573 .stop = rif_seq_stop,
574 .show = rif_seq_show,
575};
576
577static int rif_seq_open(struct inode *inode, struct file *file)
578{
579 return seq_open(file, &rif_seq_ops);
580}
581
Arjan van de Ven9a321442007-02-12 00:55:35 -0800582static const struct file_operations rif_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 .owner = THIS_MODULE,
584 .open = rif_seq_open,
585 .read = seq_read,
586 .llseek = seq_lseek,
587 .release = seq_release,
588};
589
590#endif
591
592static void tr_setup(struct net_device *dev)
593{
594 /*
595 * Configure and register
596 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900597
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 dev->hard_header = tr_header;
599 dev->rebuild_header = tr_rebuild_header;
600
601 dev->type = ARPHRD_IEEE802_TR;
602 dev->hard_header_len = TR_HLEN;
603 dev->mtu = 2000;
604 dev->addr_len = TR_ALEN;
605 dev->tx_queue_len = 100; /* Long queues on tr */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900606
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 memset(dev->broadcast,0xFF, TR_ALEN);
608
609 /* New-style flags. */
610 dev->flags = IFF_BROADCAST | IFF_MULTICAST ;
611}
612
613/**
614 * alloc_trdev - Register token ring device
615 * @sizeof_priv: Size of additional driver-private structure to be allocated
616 * for this token ring device
617 *
618 * Fill in the fields of the device structure with token ring-generic values.
619 *
620 * Constructs a new net device, complete with a private data area of
621 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
622 * this private data area.
623 */
624struct net_device *alloc_trdev(int sizeof_priv)
625{
626 return alloc_netdev(sizeof_priv, "tr%d", tr_setup);
627}
628
629/*
630 * Called during bootup. We don't actually have to initialise
631 * too much for this.
632 */
633
634static int __init rif_init(void)
635{
636 init_timer(&rif_timer);
637 rif_timer.expires = sysctl_tr_rif_timeout;
638 rif_timer.data = 0L;
639 rif_timer.function = rif_check_expire;
640 add_timer(&rif_timer);
641
642 proc_net_fops_create("tr_rif", S_IRUGO, &rif_seq_fops);
643 return 0;
644}
645
646module_init(rif_init);
647
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648EXPORT_SYMBOL(tr_type_trans);
649EXPORT_SYMBOL(alloc_trdev);