blob: a2bd0f2e3af84c85e5e0077963b2bd3616b69d93 [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>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020039#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
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 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +090049
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 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +090066
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 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +090075
Linus Torvalds1da177e2005-04-16 15:20:36 -070076static 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 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101static int tr_header(struct sk_buff *skb, struct net_device *dev,
102 unsigned short type,
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700103 const void *daddr, const void *saddr, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
105 struct trh_hdr *trh;
106 int hdr_len;
107
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900108 /*
109 * Add the 802.2 SNAP header if IP as the IPv4/IPv6 code calls
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 * 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);
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900127 trh = (struct trh_hdr *)skb_push(skb, hdr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 }
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 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900141
142 if(daddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 {
144 memcpy(trh->daddr,daddr,dev->addr_len);
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700145 tr_source_route(skb, trh, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 return(hdr_len);
147 }
148
149 return -hdr_len;
150}
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152/*
153 * A neighbour discovery of some species (eg arp) has completed. We
154 * can now send the packet.
155 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900156
157static int tr_rebuild_header(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
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 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900166
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 if(trllc->ethertype != htons(ETH_P_IP)) {
Al Viro0ac07602006-09-26 21:23:16 -0700168 printk("tr_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(trllc->ethertype));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 return 0;
170 }
171
172#ifdef CONFIG_INET
173 if(arp_find(trh->daddr, skb)) {
174 return 1;
175 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900176 else
177#endif
178 {
179 tr_source_route(skb,trh,dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 return 0;
181 }
182}
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900183
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184/*
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 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900189
Al Viro0ac07602006-09-26 21:23:16 -0700190__be16 tr_type_trans(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
192
Arnaldo Carvalho de Meloc1a4b862007-03-19 15:27:07 -0700193 struct trh_hdr *trh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 struct trllc *trllc;
195 unsigned riflen=0;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900196
Arnaldo Carvalho de Meloc8fb7942007-03-19 15:29:16 -0700197 skb->dev = dev;
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700198 skb_reset_mac_header(skb);
Arnaldo Carvalho de Meloc1a4b862007-03-19 15:27:07 -0700199 trh = tr_hdr(skb);
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900200
201 if(trh->saddr[0] & TR_RII)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
203
204 trllc = (struct trllc *)(skb->data+sizeof(struct trh_hdr)-TR_MAXRIFLEN+riflen);
205
206 skb_pull(skb,sizeof(struct trh_hdr)-TR_MAXRIFLEN+riflen);
207
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900208 if(*trh->daddr & 0x80)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 {
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900210 if(!memcmp(trh->daddr,dev->broadcast,TR_ALEN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 skb->pkt_type=PACKET_BROADCAST;
212 else
213 skb->pkt_type=PACKET_MULTICAST;
214 }
215 else if ( (trh->daddr[0] & 0x01) && (trh->daddr[1] & 0x00) && (trh->daddr[2] & 0x5E))
216 {
217 skb->pkt_type=PACKET_MULTICAST;
218 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900219 else if(dev->flags & IFF_PROMISC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 {
221 if(memcmp(trh->daddr, dev->dev_addr, TR_ALEN))
222 skb->pkt_type=PACKET_OTHERHOST;
223 }
224
225 if ((skb->pkt_type != PACKET_BROADCAST) &&
226 (skb->pkt_type != PACKET_MULTICAST))
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900227 tr_add_rif_info(trh,dev) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
229 /*
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900230 * Strip the SNAP header from ARP packets since we don't
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 * pass them through to the 802.2/SNAP layers.
232 */
233
234 if (trllc->dsap == EXTENDED_SAP &&
Al Viro0ac07602006-09-26 21:23:16 -0700235 (trllc->ethertype == htons(ETH_P_IP) ||
236 trllc->ethertype == htons(ETH_P_IPV6) ||
237 trllc->ethertype == htons(ETH_P_ARP)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 {
239 skb_pull(skb, sizeof(struct trllc));
240 return trllc->ethertype;
241 }
242
Al Viro0ac07602006-09-26 21:23:16 -0700243 return htons(ETH_P_TR_802_2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244}
245
246/*
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900247 * We try to do source routing...
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 */
249
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700250void tr_source_route(struct sk_buff *skb,struct trh_hdr *trh,
251 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252{
253 int slack;
254 unsigned int hash;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700255 struct rif_cache *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 unsigned char *olddata;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700257 unsigned long flags;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900258 static const unsigned char mcast_func_addr[]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 = {0xC0,0x00,0x00,0x04,0x00,0x00};
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900260
Jay Vosburgh001dd252005-08-18 14:04:51 -0700261 spin_lock_irqsave(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263 /*
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900264 * Broadcasts are single route as stated in RFC 1042
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 */
266 if( (!memcmp(&(trh->daddr[0]),&(dev->broadcast[0]),TR_ALEN)) ||
267 (!memcmp(&(trh->daddr[0]),&(mcast_func_addr[0]), TR_ALEN)) )
268 {
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900269 trh->rcf=htons((((sizeof(trh->rcf)) << 8) & TR_RCF_LEN_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 | TR_RCF_FRAME2K | TR_RCF_LIMITED_BROADCAST);
271 trh->saddr[0]|=TR_RII;
272 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900273 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 {
275 hash = rif_hash(trh->daddr);
276 /*
277 * Walk the hash table and look for an entry
278 */
279 for(entry=rif_table[hash];entry && memcmp(&(entry->addr[0]),&(trh->daddr[0]),TR_ALEN);entry=entry->next);
280
281 /*
282 * If we found an entry we can route the frame.
283 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900284 if(entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 {
286#if TR_SR_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700287{
288DECLARE_MAC_BUF(mac);
289printk("source routing for %s\n",print_mac(mac, trh->daddr));
290}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291#endif
292 if(!entry->local_ring && (ntohs(entry->rcf) & TR_RCF_LEN_MASK) >> 8)
293 {
294 trh->rcf=entry->rcf;
295 memcpy(&trh->rseg[0],&entry->rseg[0],8*sizeof(unsigned short));
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900296 trh->rcf^=htons(TR_RCF_DIR_BIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 trh->rcf&=htons(0x1fff); /* Issam Chehab <ichehab@madge1.demon.co.uk> */
298
299 trh->saddr[0]|=TR_RII;
300#if TR_SR_DEBUG
301 printk("entry found with rcf %04x\n", entry->rcf);
302 }
303 else
304 {
305 printk("entry found but without rcf length, local=%02x\n", entry->local_ring);
306#endif
307 }
308 entry->last_used=jiffies;
309 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900310 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 {
312 /*
313 * Without the information we simply have to shout
314 * on the wire. The replies should rapidly clean this
315 * situation up.
316 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900317 trh->rcf=htons((((sizeof(trh->rcf)) << 8) & TR_RCF_LEN_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 | TR_RCF_FRAME2K | TR_RCF_LIMITED_BROADCAST);
319 trh->saddr[0]|=TR_RII;
320#if TR_SR_DEBUG
321 printk("no entry in rif table found - broadcasting frame\n");
322#endif
323 }
324 }
325
326 /* Compress the RIF here so we don't have to do it in the driver(s) */
327 if (!(trh->saddr[0] & 0x80))
328 slack = 18;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900329 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 slack = 18 - ((ntohs(trh->rcf) & TR_RCF_LEN_MASK)>>8);
331 olddata = skb->data;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700332 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
334 skb_pull(skb, slack);
335 memmove(skb->data, olddata, sizeof(struct trh_hdr) - slack);
336}
337
338/*
339 * We have learned some new RIF information for our source
340 * routing.
341 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900342
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343static void tr_add_rif_info(struct trh_hdr *trh, struct net_device *dev)
344{
345 unsigned int hash, rii_p = 0;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700346 unsigned long flags;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700347 struct rif_cache *entry;
Jochen Friedrich5ac660e2005-10-23 10:31:45 +0200348 unsigned char saddr0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
Jay Vosburgh001dd252005-08-18 14:04:51 -0700350 spin_lock_irqsave(&rif_lock, flags);
Jochen Friedrich5ac660e2005-10-23 10:31:45 +0200351 saddr0 = trh->saddr[0];
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900352
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 /*
354 * Firstly see if the entry exists
355 */
356
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900357 if(trh->saddr[0] & TR_RII)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 {
359 trh->saddr[0]&=0x7f;
360 if (((ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8) > 2)
361 {
362 rii_p = 1;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900363 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 }
365
366 hash = rif_hash(trh->saddr);
367 for(entry=rif_table[hash];entry && memcmp(&(entry->addr[0]),&(trh->saddr[0]),TR_ALEN);entry=entry->next);
368
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900369 if(entry==NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 {
371#if TR_SR_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700372 DECLARE_MAC_BUF(mac);
373 printk("adding rif_entry: addr:%s rcf:%04X\n",
374 print_mac(mac, trh->saddr), ntohs(trh->rcf));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375#endif
376 /*
377 * Allocate our new entry. A failure to allocate loses
378 * use the information. This is harmless.
379 *
380 * FIXME: We ought to keep some kind of cache size
381 * limiting and adjust the timers to suit.
382 */
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700383 entry=kmalloc(sizeof(struct rif_cache),GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900385 if(!entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 {
387 printk(KERN_DEBUG "tr.c: Couldn't malloc rif cache entry !\n");
Jay Vosburgh001dd252005-08-18 14:04:51 -0700388 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 return;
390 }
391
392 memcpy(&(entry->addr[0]),&(trh->saddr[0]),TR_ALEN);
393 entry->iface = dev->ifindex;
394 entry->next=rif_table[hash];
395 entry->last_used=jiffies;
396 rif_table[hash]=entry;
397
398 if (rii_p)
399 {
400 entry->rcf = trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK);
401 memcpy(&(entry->rseg[0]),&(trh->rseg[0]),8*sizeof(unsigned short));
402 entry->local_ring = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 }
404 else
405 {
406 entry->local_ring = 1;
407 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900408 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 else /* Y. Tahara added */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900410 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 /*
412 * Update existing entries
413 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900414 if (!entry->local_ring)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 if (entry->rcf != (trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK)) &&
416 !(trh->rcf & htons(TR_RCF_BROADCAST_MASK)))
417 {
418#if TR_SR_DEBUG
Joe Perches0795af52007-10-03 17:59:30 -0700419{
420DECLARE_MAC_BUF(mac);
421printk("updating rif_entry: addr:%s rcf:%04X\n",
422 print_mac(mac, trh->saddr), ntohs(trh->rcf));
423}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424#endif
425 entry->rcf = trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK);
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900426 memcpy(&(entry->rseg[0]),&(trh->rseg[0]),8*sizeof(unsigned short));
427 }
428 entry->last_used=jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 }
Jochen Friedrich5ac660e2005-10-23 10:31:45 +0200430 trh->saddr[0]=saddr0; /* put the routing indicator back for tcpdump */
Jay Vosburgh001dd252005-08-18 14:04:51 -0700431 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432}
433
434/*
435 * Scan the cache with a timer and see what we need to throw out.
436 */
437
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900438static void rif_check_expire(unsigned long dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439{
440 int i;
Jay Vosburgh001dd252005-08-18 14:04:51 -0700441 unsigned long flags, next_interval = jiffies + sysctl_tr_rif_timeout/2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
Jay Vosburgh001dd252005-08-18 14:04:51 -0700443 spin_lock_irqsave(&rif_lock, flags);
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 for(i =0; i < RIF_TABLE_SIZE; i++) {
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700446 struct rif_cache *entry, **pentry;
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900447
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 pentry = rif_table+i;
449 while((entry=*pentry) != NULL) {
450 unsigned long expires
451 = entry->last_used + sysctl_tr_rif_timeout;
452
453 if (time_before_eq(expires, jiffies)) {
454 *pentry = entry->next;
455 kfree(entry);
456 } else {
457 pentry = &entry->next;
458
459 if (time_before(expires, next_interval))
460 next_interval = expires;
461 }
462 }
463 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900464
Jay Vosburgh001dd252005-08-18 14:04:51 -0700465 spin_unlock_irqrestore(&rif_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
467 mod_timer(&rif_timer, next_interval);
468
469}
470
471/*
472 * Generate the /proc/net information for the token ring RIF
473 * routing.
474 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900475
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476#ifdef CONFIG_PROC_FS
477
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700478static struct rif_cache *rif_get_idx(loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
480 int i;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700481 struct rif_cache *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 loff_t off = 0;
483
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900484 for(i = 0; i < RIF_TABLE_SIZE; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 for(entry = rif_table[i]; entry; entry = entry->next) {
486 if (off == pos)
487 return entry;
488 ++off;
489 }
490
491 return NULL;
492}
493
494static void *rif_seq_start(struct seq_file *seq, loff_t *pos)
495{
Jay Vosburgh001dd252005-08-18 14:04:51 -0700496 spin_lock_irq(&rif_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
498 return *pos ? rif_get_idx(*pos - 1) : SEQ_START_TOKEN;
499}
500
501static void *rif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
502{
503 int i;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700504 struct rif_cache *ent = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
506 ++*pos;
507
508 if (v == SEQ_START_TOKEN) {
509 i = -1;
510 goto scan;
511 }
512
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900513 if (ent->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 return ent->next;
515
516 i = rif_hash(ent->addr);
517 scan:
518 while (++i < RIF_TABLE_SIZE) {
519 if ((ent = rif_table[i]) != NULL)
520 return ent;
521 }
522 return NULL;
523}
524
525static void rif_seq_stop(struct seq_file *seq, void *v)
526{
Jay Vosburgh001dd252005-08-18 14:04:51 -0700527 spin_unlock_irq(&rif_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528}
529
530static int rif_seq_show(struct seq_file *seq, void *v)
531{
532 int j, rcf_len, segment, brdgnmb;
Alexey Dobriyanc8b35d22005-05-26 12:59:42 -0700533 struct rif_cache *entry = v;
Joe Perches0795af52007-10-03 17:59:30 -0700534 DECLARE_MAC_BUF(mac);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
536 if (v == SEQ_START_TOKEN)
537 seq_puts(seq,
538 "if TR address TTL rcf routing segments\n");
539 else {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700540 struct net_device *dev = dev_get_by_index(&init_net, entry->iface);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 long ttl = (long) (entry->last_used + sysctl_tr_rif_timeout)
542 - (long) jiffies;
543
Joe Perches0795af52007-10-03 17:59:30 -0700544 seq_printf(seq, "%s %s %7li ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 dev?dev->name:"?",
Joe Perches0795af52007-10-03 17:59:30 -0700546 print_mac(mac, entry->addr),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 ttl/HZ);
548
549 if (entry->local_ring)
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900550 seq_puts(seq, "local\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 else {
552
553 seq_printf(seq, "%04X", ntohs(entry->rcf));
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900554 rcf_len = ((ntohs(entry->rcf) & TR_RCF_LEN_MASK)>>8)-2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 if (rcf_len)
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900556 rcf_len >>= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 for(j = 1; j < rcf_len; j++) {
558 if(j==1) {
559 segment=ntohs(entry->rseg[j-1])>>4;
560 seq_printf(seq," %03X",segment);
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700561 }
562
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 segment=ntohs(entry->rseg[j])>>4;
564 brdgnmb=ntohs(entry->rseg[j-1])&0x00f;
565 seq_printf(seq,"-%01X-%03X",brdgnmb,segment);
566 }
567 seq_putc(seq, '\n');
568 }
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900569 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 return 0;
571}
572
573
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700574static const struct seq_operations rif_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 .start = rif_seq_start,
576 .next = rif_seq_next,
577 .stop = rif_seq_stop,
578 .show = rif_seq_show,
579};
580
581static int rif_seq_open(struct inode *inode, struct file *file)
582{
583 return seq_open(file, &rif_seq_ops);
584}
585
Arjan van de Ven9a321442007-02-12 00:55:35 -0800586static const struct file_operations rif_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 .owner = THIS_MODULE,
588 .open = rif_seq_open,
589 .read = seq_read,
590 .llseek = seq_lseek,
591 .release = seq_release,
592};
593
594#endif
595
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700596static const struct header_ops tr_header_ops = {
597 .create = tr_header,
598 .rebuild= tr_rebuild_header,
599};
600
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601static void tr_setup(struct net_device *dev)
602{
603 /*
604 * Configure and register
605 */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900606
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700607 dev->header_ops = &tr_header_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
609 dev->type = ARPHRD_IEEE802_TR;
610 dev->hard_header_len = TR_HLEN;
611 dev->mtu = 2000;
612 dev->addr_len = TR_ALEN;
613 dev->tx_queue_len = 100; /* Long queues on tr */
YOSHIFUJI Hideaki9afa0942007-02-09 23:24:24 +0900614
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 memset(dev->broadcast,0xFF, TR_ALEN);
616
617 /* New-style flags. */
618 dev->flags = IFF_BROADCAST | IFF_MULTICAST ;
619}
620
621/**
622 * alloc_trdev - Register token ring device
623 * @sizeof_priv: Size of additional driver-private structure to be allocated
624 * for this token ring device
625 *
626 * Fill in the fields of the device structure with token ring-generic values.
627 *
628 * Constructs a new net device, complete with a private data area of
629 * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
630 * this private data area.
631 */
632struct net_device *alloc_trdev(int sizeof_priv)
633{
634 return alloc_netdev(sizeof_priv, "tr%d", tr_setup);
635}
636
637/*
638 * Called during bootup. We don't actually have to initialise
639 * too much for this.
640 */
641
642static int __init rif_init(void)
643{
644 init_timer(&rif_timer);
645 rif_timer.expires = sysctl_tr_rif_timeout;
646 rif_timer.data = 0L;
647 rif_timer.function = rif_check_expire;
648 add_timer(&rif_timer);
649
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200650 proc_net_fops_create(&init_net, "tr_rif", S_IRUGO, &rif_seq_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 return 0;
652}
653
654module_init(rif_init);
655
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656EXPORT_SYMBOL(tr_type_trans);
657EXPORT_SYMBOL(alloc_trdev);