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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>
Pavel Emelyanov36f0beb2008-01-24 17:04:49 -080038#include <linux/sysctl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <net/arp.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020040#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42static void tr_add_rif_info(struct trh_hdr *trh, struct net_device *dev);
43static void rif_check_expire(unsigned long dummy);
44
45#define TR_SR_DEBUG 0
46
47/*
48 * Each RIF entry we learn is kept this way
49 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +090050
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -070051struct rif_cache {
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 unsigned char addr[TR_ALEN];
53 int iface;
Alexey Dobriyanc6b33652005-05-26 12:59:05 -070054 __be16 rcf;
55 __be16 rseg[8];
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -070056 struct rif_cache *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 unsigned long last_used;
58 unsigned char local_ring;
59};
60
61#define RIF_TABLE_SIZE 32
62
63/*
64 * We hash the RIF cache 32 ways. We do after all have to look it
65 * up a lot.
66 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +090067
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -070068static struct rif_cache *rif_table[RIF_TABLE_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70static DEFINE_SPINLOCK(rif_lock);
71
72
73/*
74 * Garbage disposal timer.
75 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +090076
Linus Torvalds1da177e2005-04-16 15:20:36 -070077static struct timer_list rif_timer;
78
Adrian Bunk81a21eb2008-01-31 17:16:32 -080079static int sysctl_tr_rif_timeout = 60*10*HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81static inline unsigned long rif_hash(const unsigned char *addr)
82{
83 unsigned long x;
84
85 x = addr[0];
86 x = (x << 2) ^ addr[1];
87 x = (x << 2) ^ addr[2];
88 x = (x << 2) ^ addr[3];
89 x = (x << 2) ^ addr[4];
90 x = (x << 2) ^ addr[5];
91
92 x ^= x >> 8;
93
94 return x & (RIF_TABLE_SIZE - 1);
95}
96
97/*
98 * Put the headers on a token ring packet. Token ring source routing
99 * makes this a little more exciting than on ethernet.
100 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102static int tr_header(struct sk_buff *skb, struct net_device *dev,
103 unsigned short type,
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700104 const void *daddr, const void *saddr, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
106 struct trh_hdr *trh;
107 int hdr_len;
108
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900109 /*
110 * Add the 802.2 SNAP header if IP as the IPv4/IPv6 code calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 * dev->hard_header directly.
112 */
113 if (type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
114 {
115 struct trllc *trllc;
116
117 hdr_len = sizeof(struct trh_hdr) + sizeof(struct trllc);
118 trh = (struct trh_hdr *)skb_push(skb, hdr_len);
119 trllc = (struct trllc *)(trh+1);
120 trllc->dsap = trllc->ssap = EXTENDED_SAP;
121 trllc->llc = UI_CMD;
122 trllc->protid[0] = trllc->protid[1] = trllc->protid[2] = 0x00;
123 trllc->ethertype = htons(type);
124 }
125 else
126 {
127 hdr_len = sizeof(struct trh_hdr);
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900128 trh = (struct trh_hdr *)skb_push(skb, hdr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 }
130
131 trh->ac=AC;
132 trh->fc=LLC_FRAME;
133
134 if(saddr)
135 memcpy(trh->saddr,saddr,dev->addr_len);
136 else
137 memcpy(trh->saddr,dev->dev_addr,dev->addr_len);
138
139 /*
140 * Build the destination and then source route the frame
141 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900142
143 if(daddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 {
145 memcpy(trh->daddr,daddr,dev->addr_len);
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700146 tr_source_route(skb, trh, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 return(hdr_len);
148 }
149
150 return -hdr_len;
151}
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153/*
154 * A neighbour discovery of some species (eg arp) has completed. We
155 * can now send the packet.
156 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900157
158static int tr_rebuild_header(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
160 struct trh_hdr *trh=(struct trh_hdr *)skb->data;
161 struct trllc *trllc=(struct trllc *)(skb->data+sizeof(struct trh_hdr));
162 struct net_device *dev = skb->dev;
163
164 /*
165 * FIXME: We don't yet support IPv6 over token rings
166 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 if(trllc->ethertype != htons(ETH_P_IP)) {
Al Viro0ac07602006-09-26 21:23:16 -0700169 printk("tr_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(trllc->ethertype));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 return 0;
171 }
172
173#ifdef CONFIG_INET
174 if(arp_find(trh->daddr, skb)) {
175 return 1;
176 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900177 else
178#endif
179 {
180 tr_source_route(skb,trh,dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 return 0;
182 }
183}
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185/*
186 * Some of this is a bit hackish. We intercept RIF information
187 * used for source routing. We also grab IP directly and don't feed
188 * it via SNAP.
189 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900190
Al Viro0ac07602006-09-26 21:23:16 -0700191__be16 tr_type_trans(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192{
193
Arnaldo Carvalho de Meloc1a4b862007-03-19 15:27:07 -0700194 struct trh_hdr *trh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 struct trllc *trllc;
196 unsigned riflen=0;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900197
Arnaldo Carvalho de Meloc8fb7942007-03-19 15:29:16 -0700198 skb->dev = dev;
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700199 skb_reset_mac_header(skb);
Arnaldo Carvalho de Meloc1a4b862007-03-19 15:27:07 -0700200 trh = tr_hdr(skb);
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900201
202 if(trh->saddr[0] & TR_RII)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
204
205 trllc = (struct trllc *)(skb->data+sizeof(struct trh_hdr)-TR_MAXRIFLEN+riflen);
206
207 skb_pull(skb,sizeof(struct trh_hdr)-TR_MAXRIFLEN+riflen);
208
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900209 if(*trh->daddr & 0x80)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 {
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900211 if(!memcmp(trh->daddr,dev->broadcast,TR_ALEN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 skb->pkt_type=PACKET_BROADCAST;
213 else
214 skb->pkt_type=PACKET_MULTICAST;
215 }
216 else if ( (trh->daddr[0] & 0x01) && (trh->daddr[1] & 0x00) && (trh->daddr[2] & 0x5E))
217 {
218 skb->pkt_type=PACKET_MULTICAST;
219 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900220 else if(dev->flags & IFF_PROMISC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 {
222 if(memcmp(trh->daddr, dev->dev_addr, TR_ALEN))
223 skb->pkt_type=PACKET_OTHERHOST;
224 }
225
226 if ((skb->pkt_type != PACKET_BROADCAST) &&
227 (skb->pkt_type != PACKET_MULTICAST))
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900228 tr_add_rif_info(trh,dev) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230 /*
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900231 * Strip the SNAP header from ARP packets since we don't
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 * pass them through to the 802.2/SNAP layers.
233 */
234
235 if (trllc->dsap == EXTENDED_SAP &&
Al Viro0ac07602006-09-26 21:23:16 -0700236 (trllc->ethertype == htons(ETH_P_IP) ||
237 trllc->ethertype == htons(ETH_P_IPV6) ||
238 trllc->ethertype == htons(ETH_P_ARP)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 {
240 skb_pull(skb, sizeof(struct trllc));
241 return trllc->ethertype;
242 }
243
Al Viro0ac07602006-09-26 21:23:16 -0700244 return htons(ETH_P_TR_802_2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245}
246
247/*
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900248 * We try to do source routing...
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 */
250
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700251void tr_source_route(struct sk_buff *skb,struct trh_hdr *trh,
252 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253{
254 int slack;
255 unsigned int hash;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700256 struct rif_cache *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 unsigned char *olddata;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700258 unsigned long flags;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900259 static const unsigned char mcast_func_addr[]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 = {0xC0,0x00,0x00,0x04,0x00,0x00};
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900261
Jay Vosburgh001dd252005-08-18 14:04:51 -0700262 spin_lock_irqsave(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
264 /*
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900265 * Broadcasts are single route as stated in RFC 1042
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 */
267 if( (!memcmp(&(trh->daddr[0]),&(dev->broadcast[0]),TR_ALEN)) ||
268 (!memcmp(&(trh->daddr[0]),&(mcast_func_addr[0]), TR_ALEN)) )
269 {
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900270 trh->rcf=htons((((sizeof(trh->rcf)) << 8) & TR_RCF_LEN_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 | TR_RCF_FRAME2K | TR_RCF_LIMITED_BROADCAST);
272 trh->saddr[0]|=TR_RII;
273 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900274 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 {
276 hash = rif_hash(trh->daddr);
277 /*
278 * Walk the hash table and look for an entry
279 */
280 for(entry=rif_table[hash];entry && memcmp(&(entry->addr[0]),&(trh->daddr[0]),TR_ALEN);entry=entry->next);
281
282 /*
283 * If we found an entry we can route the frame.
284 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900285 if(entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 {
287#if TR_SR_DEBUG
Johannes Berge1749612008-10-27 15:59:26 -0700288printk("source routing for %pM\n", trh->daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289#endif
290 if(!entry->local_ring && (ntohs(entry->rcf) & TR_RCF_LEN_MASK) >> 8)
291 {
292 trh->rcf=entry->rcf;
293 memcpy(&trh->rseg[0],&entry->rseg[0],8*sizeof(unsigned short));
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900294 trh->rcf^=htons(TR_RCF_DIR_BIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 trh->rcf&=htons(0x1fff); /* Issam Chehab <ichehab@madge1.demon.co.uk> */
296
297 trh->saddr[0]|=TR_RII;
298#if TR_SR_DEBUG
299 printk("entry found with rcf %04x\n", entry->rcf);
300 }
301 else
302 {
303 printk("entry found but without rcf length, local=%02x\n", entry->local_ring);
304#endif
305 }
306 entry->last_used=jiffies;
307 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900308 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 {
310 /*
311 * Without the information we simply have to shout
312 * on the wire. The replies should rapidly clean this
313 * situation up.
314 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900315 trh->rcf=htons((((sizeof(trh->rcf)) << 8) & TR_RCF_LEN_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 | TR_RCF_FRAME2K | TR_RCF_LIMITED_BROADCAST);
317 trh->saddr[0]|=TR_RII;
318#if TR_SR_DEBUG
319 printk("no entry in rif table found - broadcasting frame\n");
320#endif
321 }
322 }
323
324 /* Compress the RIF here so we don't have to do it in the driver(s) */
325 if (!(trh->saddr[0] & 0x80))
326 slack = 18;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900327 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 slack = 18 - ((ntohs(trh->rcf) & TR_RCF_LEN_MASK)>>8);
329 olddata = skb->data;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700330 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
332 skb_pull(skb, slack);
333 memmove(skb->data, olddata, sizeof(struct trh_hdr) - slack);
334}
335
336/*
337 * We have learned some new RIF information for our source
338 * routing.
339 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341static void tr_add_rif_info(struct trh_hdr *trh, struct net_device *dev)
342{
343 unsigned int hash, rii_p = 0;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700344 unsigned long flags;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700345 struct rif_cache *entry;
Jochen Friedrich5ac660e2005-10-23 10:31:45 +0200346 unsigned char saddr0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Jay Vosburgh001dd252005-08-18 14:04:51 -0700348 spin_lock_irqsave(&rif_lock, flags);
Jochen Friedrich5ac660e2005-10-23 10:31:45 +0200349 saddr0 = trh->saddr[0];
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900350
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 /*
352 * Firstly see if the entry exists
353 */
354
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900355 if(trh->saddr[0] & TR_RII)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 {
357 trh->saddr[0]&=0x7f;
358 if (((ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8) > 2)
359 {
360 rii_p = 1;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900361 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 }
363
364 hash = rif_hash(trh->saddr);
365 for(entry=rif_table[hash];entry && memcmp(&(entry->addr[0]),&(trh->saddr[0]),TR_ALEN);entry=entry->next);
366
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900367 if(entry==NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 {
369#if TR_SR_DEBUG
Johannes Berge1749612008-10-27 15:59:26 -0700370 printk("adding rif_entry: addr:%pM rcf:%04X\n",
371 trh->saddr, ntohs(trh->rcf));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372#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
Johannes Berge1749612008-10-27 15:59:26 -0700416printk("updating rif_entry: addr:%pM rcf:%04X\n",
417 trh->saddr, ntohs(trh->rcf));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418#endif
419 entry->rcf = trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK);
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900420 memcpy(&(entry->rseg[0]),&(trh->rseg[0]),8*sizeof(unsigned short));
421 }
422 entry->last_used=jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 }
Jochen Friedrich5ac660e2005-10-23 10:31:45 +0200424 trh->saddr[0]=saddr0; /* put the routing indicator back for tcpdump */
Jay Vosburgh001dd252005-08-18 14:04:51 -0700425 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426}
427
428/*
429 * Scan the cache with a timer and see what we need to throw out.
430 */
431
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900432static void rif_check_expire(unsigned long dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433{
434 int i;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700435 unsigned long flags, next_interval = jiffies + sysctl_tr_rif_timeout/2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
Jay Vosburgh001dd252005-08-18 14:04:51 -0700437 spin_lock_irqsave(&rif_lock, flags);
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900438
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 for(i =0; i < RIF_TABLE_SIZE; i++) {
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700440 struct rif_cache *entry, **pentry;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900441
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 pentry = rif_table+i;
443 while((entry=*pentry) != NULL) {
444 unsigned long expires
445 = entry->last_used + sysctl_tr_rif_timeout;
446
447 if (time_before_eq(expires, jiffies)) {
448 *pentry = entry->next;
449 kfree(entry);
450 } else {
451 pentry = &entry->next;
452
453 if (time_before(expires, next_interval))
454 next_interval = expires;
455 }
456 }
457 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900458
Jay Vosburgh001dd252005-08-18 14:04:51 -0700459 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
461 mod_timer(&rif_timer, next_interval);
462
463}
464
465/*
466 * Generate the /proc/net information for the token ring RIF
467 * routing.
468 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900469
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470#ifdef CONFIG_PROC_FS
471
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700472static struct rif_cache *rif_get_idx(loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473{
474 int i;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700475 struct rif_cache *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 loff_t off = 0;
477
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900478 for(i = 0; i < RIF_TABLE_SIZE; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 for(entry = rif_table[i]; entry; entry = entry->next) {
480 if (off == pos)
481 return entry;
482 ++off;
483 }
484
485 return NULL;
486}
487
488static void *rif_seq_start(struct seq_file *seq, loff_t *pos)
489{
Jay Vosburgh001dd252005-08-18 14:04:51 -0700490 spin_lock_irq(&rif_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
492 return *pos ? rif_get_idx(*pos - 1) : SEQ_START_TOKEN;
493}
494
495static void *rif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
496{
497 int i;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700498 struct rif_cache *ent = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 ++*pos;
501
502 if (v == SEQ_START_TOKEN) {
503 i = -1;
504 goto scan;
505 }
506
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900507 if (ent->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 return ent->next;
509
510 i = rif_hash(ent->addr);
511 scan:
512 while (++i < RIF_TABLE_SIZE) {
513 if ((ent = rif_table[i]) != NULL)
514 return ent;
515 }
516 return NULL;
517}
518
519static void rif_seq_stop(struct seq_file *seq, void *v)
520{
Jay Vosburgh001dd252005-08-18 14:04:51 -0700521 spin_unlock_irq(&rif_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522}
523
524static int rif_seq_show(struct seq_file *seq, void *v)
525{
526 int j, rcf_len, segment, brdgnmb;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700527 struct rif_cache *entry = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
529 if (v == SEQ_START_TOKEN)
530 seq_puts(seq,
531 "if TR address TTL rcf routing segments\n");
532 else {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700533 struct net_device *dev = dev_get_by_index(&init_net, entry->iface);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 long ttl = (long) (entry->last_used + sysctl_tr_rif_timeout)
535 - (long) jiffies;
536
Johannes Berge1749612008-10-27 15:59:26 -0700537 seq_printf(seq, "%s %pM %7li ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 dev?dev->name:"?",
Johannes Berge1749612008-10-27 15:59:26 -0700539 entry->addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 ttl/HZ);
541
542 if (entry->local_ring)
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900543 seq_puts(seq, "local\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 else {
545
546 seq_printf(seq, "%04X", ntohs(entry->rcf));
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900547 rcf_len = ((ntohs(entry->rcf) & TR_RCF_LEN_MASK)>>8)-2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 if (rcf_len)
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900549 rcf_len >>= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 for(j = 1; j < rcf_len; j++) {
551 if(j==1) {
552 segment=ntohs(entry->rseg[j-1])>>4;
553 seq_printf(seq," %03X",segment);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700554 }
555
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 segment=ntohs(entry->rseg[j])>>4;
557 brdgnmb=ntohs(entry->rseg[j-1])&0x00f;
558 seq_printf(seq,"-%01X-%03X",brdgnmb,segment);
559 }
560 seq_putc(seq, '\n');
561 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900562 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 return 0;
564}
565
566
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700567static const struct seq_operations rif_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 .start = rif_seq_start,
569 .next = rif_seq_next,
570 .stop = rif_seq_stop,
571 .show = rif_seq_show,
572};
573
574static int rif_seq_open(struct inode *inode, struct file *file)
575{
576 return seq_open(file, &rif_seq_ops);
577}
578
Arjan van de Ven9a321442007-02-12 00:55:35 -0800579static const struct file_operations rif_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 .owner = THIS_MODULE,
581 .open = rif_seq_open,
582 .read = seq_read,
583 .llseek = seq_lseek,
584 .release = seq_release,
585};
586
587#endif
588
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700589static const struct header_ops tr_header_ops = {
590 .create = tr_header,
591 .rebuild= tr_rebuild_header,
592};
593
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594static void tr_setup(struct net_device *dev)
595{
596 /*
597 * Configure and register
598 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900599
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700600 dev->header_ops = &tr_header_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601
602 dev->type = ARPHRD_IEEE802_TR;
603 dev->hard_header_len = TR_HLEN;
604 dev->mtu = 2000;
605 dev->addr_len = TR_ALEN;
606 dev->tx_queue_len = 100; /* Long queues on tr */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900607
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 memset(dev->broadcast,0xFF, TR_ALEN);
609
610 /* New-style flags. */
611 dev->flags = IFF_BROADCAST | IFF_MULTICAST ;
612}
613
614/**
615 * alloc_trdev - Register token ring device
616 * @sizeof_priv: Size of additional driver-private structure to be allocated
617 * for this token ring device
618 *
619 * Fill in the fields of the device structure with token ring-generic values.
620 *
621 * Constructs a new net device, complete with a private data area of
622 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
623 * this private data area.
624 */
625struct net_device *alloc_trdev(int sizeof_priv)
626{
627 return alloc_netdev(sizeof_priv, "tr%d", tr_setup);
628}
629
Pavel Emelyanov36f0beb2008-01-24 17:04:49 -0800630#ifdef CONFIG_SYSCTL
631static struct ctl_table tr_table[] = {
632 {
633 .ctl_name = NET_TR_RIF_TIMEOUT,
634 .procname = "rif_timeout",
635 .data = &sysctl_tr_rif_timeout,
636 .maxlen = sizeof(int),
637 .mode = 0644,
Alexey Dobriyan6d9f2392008-11-03 18:21:05 -0800638 .proc_handler = proc_dointvec
Pavel Emelyanov36f0beb2008-01-24 17:04:49 -0800639 },
640 { 0 },
641};
642
643static __initdata struct ctl_path tr_path[] = {
644 { .procname = "net", .ctl_name = CTL_NET, },
645 { .procname = "token-ring", .ctl_name = NET_TR, },
646 { }
647};
648#endif
649
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650/*
651 * Called during bootup. We don't actually have to initialise
652 * too much for this.
653 */
654
655static int __init rif_init(void)
656{
Eric Dumazet1b310fc2008-01-13 22:32:49 -0800657 rif_timer.expires = jiffies + sysctl_tr_rif_timeout;
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -0800658 setup_timer(&rif_timer, rif_check_expire, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 add_timer(&rif_timer);
Pavel Emelyanov36f0beb2008-01-24 17:04:49 -0800660#ifdef CONFIG_SYSCTL
661 register_sysctl_paths(tr_path, tr_table);
662#endif
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200663 proc_net_fops_create(&init_net, "tr_rif", S_IRUGO, &rif_seq_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 return 0;
665}
666
667module_init(rif_init);
668
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669EXPORT_SYMBOL(tr_type_trans);
670EXPORT_SYMBOL(alloc_trdev);