blob: 2f665a516476a019460046d61195310aecf5654a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet Routing Functions (Endnode and Router)
7 *
8 * Authors: Steve Whitehouse <SteveW@ACM.org>
9 * Eduardo Marcelo Serrat <emserrat@geocities.com>
10 *
11 * Changes:
12 * Steve Whitehouse : Fixes to allow "intra-ethernet" and
13 * "return-to-sender" bits on outgoing
14 * packets.
15 * Steve Whitehouse : Timeouts for cached routes.
16 * Steve Whitehouse : Use dst cache for input routes too.
17 * Steve Whitehouse : Fixed error values in dn_send_skb.
18 * Steve Whitehouse : Rework routing functions to better fit
19 * DECnet routing design
20 * Alexey Kuznetsov : New SMP locking
21 * Steve Whitehouse : More SMP locking changes & dn_cache_dump()
22 * Steve Whitehouse : Prerouting NF hook, now really is prerouting.
23 * Fixed possible skb leak in rtnetlink funcs.
24 * Steve Whitehouse : Dave Miller's dynamic hash table sizing and
25 * Alexey Kuznetsov's finer grained locking
26 * from ipv4/route.c.
27 * Steve Whitehouse : Routing is now starting to look like a
28 * sensible set of code now, mainly due to
29 * my copying the IPv4 routing code. The
30 * hooks here are modified and will continue
31 * to evolve for a while.
32 * Steve Whitehouse : Real SMP at last :-) Also new netfilter
33 * stuff. Look out raw sockets your days
34 * are numbered!
35 * Steve Whitehouse : Added return-to-sender functions. Added
36 * backlog congestion level return codes.
37 * Steve Whitehouse : Fixed bug where routes were set up with
38 * no ref count on net devices.
39 * Steve Whitehouse : RCU for the route cache
40 * Steve Whitehouse : Preparations for the flow cache
41 * Steve Whitehouse : Prepare for nonlinear skbs
42 */
43
44/******************************************************************************
45 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +090046
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 This program is free software; you can redistribute it and/or modify
48 it under the terms of the GNU General Public License as published by
49 the Free Software Foundation; either version 2 of the License, or
50 any later version.
51
52 This program is distributed in the hope that it will be useful,
53 but WITHOUT ANY WARRANTY; without even the implied warranty of
54 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
55 GNU General Public License for more details.
56*******************************************************************************/
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#include <linux/errno.h>
59#include <linux/types.h>
60#include <linux/socket.h>
61#include <linux/in.h>
62#include <linux/kernel.h>
63#include <linux/sockios.h>
64#include <linux/net.h>
65#include <linux/netdevice.h>
66#include <linux/inet.h>
67#include <linux/route.h>
68#include <linux/in_route.h>
69#include <net/sock.h>
70#include <linux/mm.h>
71#include <linux/proc_fs.h>
72#include <linux/seq_file.h>
73#include <linux/init.h>
74#include <linux/rtnetlink.h>
75#include <linux/string.h>
76#include <linux/netfilter_decnet.h>
77#include <linux/rcupdate.h>
78#include <linux/times.h>
79#include <asm/errno.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020080#include <net/net_namespace.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070081#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070082#include <net/neighbour.h>
83#include <net/dst.h>
84#include <net/flow.h>
Steven Whitehousea8731cb2006-08-09 15:56:46 -070085#include <net/fib_rules.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070086#include <net/dn.h>
87#include <net/dn_dev.h>
88#include <net/dn_nsp.h>
89#include <net/dn_route.h>
90#include <net/dn_neigh.h>
91#include <net/dn_fib.h>
92
93struct dn_rt_hash_bucket
94{
95 struct dn_route *chain;
96 spinlock_t lock;
Eric Dumazetfca09fb2008-02-07 23:29:57 -080097};
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99extern struct neigh_table dn_neigh_table;
100
101
102static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00};
103
104static const int dn_rt_min_delay = 2 * HZ;
105static const int dn_rt_max_delay = 10 * HZ;
106static const int dn_rt_mtu_expires = 10 * 60 * HZ;
107
108static unsigned long dn_rt_deadline;
109
Daniel Lezcano569d3642008-01-18 03:56:57 -0800110static int dn_dst_gc(struct dst_ops *ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
112static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
113static void dn_dst_link_failure(struct sk_buff *);
114static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu);
115static int dn_route_input(struct sk_buff *);
116static void dn_run_flush(unsigned long dummy);
117
118static struct dn_rt_hash_bucket *dn_rt_hash_table;
119static unsigned dn_rt_hash_mask;
120
121static struct timer_list dn_route_timer;
Ingo Molnar8d06afa2005-09-09 13:10:40 -0700122static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123int decnet_dst_gc_interval = 2;
124
125static struct dst_ops dn_dst_ops = {
126 .family = PF_DECnet,
127 .protocol = __constant_htons(ETH_P_DNA_RT),
128 .gc_thresh = 128,
129 .gc = dn_dst_gc,
130 .check = dn_dst_check,
131 .negative_advice = dn_dst_negative_advice,
132 .link_failure = dn_dst_link_failure,
133 .update_pmtu = dn_dst_update_pmtu,
134 .entry_size = sizeof(struct dn_route),
135 .entries = ATOMIC_INIT(0),
136};
137
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800138static __inline__ unsigned dn_hash(__le16 src, __le16 dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139{
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800140 __u16 tmp = (__u16 __force)(src ^ dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 tmp ^= (tmp >> 3);
142 tmp ^= (tmp >> 5);
143 tmp ^= (tmp >> 10);
144 return dn_rt_hash_mask & (unsigned)tmp;
145}
146
147static inline void dnrt_free(struct dn_route *rt)
148{
149 call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free);
150}
151
152static inline void dnrt_drop(struct dn_route *rt)
153{
Adrian Bunk34001122006-03-20 23:00:29 -0800154 dst_release(&rt->u.dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free);
156}
157
158static void dn_dst_check_expire(unsigned long dummy)
159{
160 int i;
161 struct dn_route *rt, **rtp;
162 unsigned long now = jiffies;
163 unsigned long expire = 120 * HZ;
164
165 for(i = 0; i <= dn_rt_hash_mask; i++) {
166 rtp = &dn_rt_hash_table[i].chain;
167
168 spin_lock(&dn_rt_hash_table[i].lock);
169 while((rt=*rtp) != NULL) {
170 if (atomic_read(&rt->u.dst.__refcnt) ||
171 (now - rt->u.dst.lastuse) < expire) {
Eric Dumazet0c195c32007-02-09 16:25:52 -0800172 rtp = &rt->u.dst.dn_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 continue;
174 }
Eric Dumazet0c195c32007-02-09 16:25:52 -0800175 *rtp = rt->u.dst.dn_next;
176 rt->u.dst.dn_next = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 dnrt_free(rt);
178 }
179 spin_unlock(&dn_rt_hash_table[i].lock);
180
181 if ((jiffies - now) > 0)
182 break;
183 }
184
185 mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ);
186}
187
Daniel Lezcano569d3642008-01-18 03:56:57 -0800188static int dn_dst_gc(struct dst_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189{
190 struct dn_route *rt, **rtp;
191 int i;
192 unsigned long now = jiffies;
193 unsigned long expire = 10 * HZ;
194
195 for(i = 0; i <= dn_rt_hash_mask; i++) {
196
197 spin_lock_bh(&dn_rt_hash_table[i].lock);
198 rtp = &dn_rt_hash_table[i].chain;
199
200 while((rt=*rtp) != NULL) {
201 if (atomic_read(&rt->u.dst.__refcnt) ||
202 (now - rt->u.dst.lastuse) < expire) {
Eric Dumazet0c195c32007-02-09 16:25:52 -0800203 rtp = &rt->u.dst.dn_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 continue;
205 }
Eric Dumazet0c195c32007-02-09 16:25:52 -0800206 *rtp = rt->u.dst.dn_next;
207 rt->u.dst.dn_next = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 dnrt_drop(rt);
209 break;
210 }
211 spin_unlock_bh(&dn_rt_hash_table[i].lock);
212 }
213
214 return 0;
215}
216
217/*
218 * The decnet standards don't impose a particular minimum mtu, what they
219 * do insist on is that the routing layer accepts a datagram of at least
220 * 230 bytes long. Here we have to subtract the routing header length from
221 * 230 to get the minimum acceptable mtu. If there is no neighbour, then we
222 * assume the worst and use a long header size.
223 *
224 * We update both the mtu and the advertised mss (i.e. the segment size we
225 * advertise to the other end).
226 */
227static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu)
228{
229 u32 min_mtu = 230;
230 struct dn_dev *dn = dst->neighbour ?
231 (struct dn_dev *)dst->neighbour->dev->dn_ptr : NULL;
232
233 if (dn && dn->use_long == 0)
234 min_mtu -= 6;
235 else
236 min_mtu -= 21;
237
238 if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= min_mtu) {
239 if (!(dst_metric_locked(dst, RTAX_MTU))) {
240 dst->metrics[RTAX_MTU-1] = mtu;
241 dst_set_expires(dst, dn_rt_mtu_expires);
242 }
243 if (!(dst_metric_locked(dst, RTAX_ADVMSS))) {
244 u32 mss = mtu - DN_MAX_NSP_DATA_HEADER;
245 if (dst->metrics[RTAX_ADVMSS-1] > mss)
246 dst->metrics[RTAX_ADVMSS-1] = mss;
247 }
248 }
249}
250
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900251/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 * When a route has been marked obsolete. (e.g. routing cache flush)
253 */
254static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie)
255{
256 return NULL;
257}
258
259static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst)
260{
261 dst_release(dst);
262 return NULL;
263}
264
265static void dn_dst_link_failure(struct sk_buff *skb)
266{
267 return;
268}
269
270static inline int compare_keys(struct flowi *fl1, struct flowi *fl2)
271{
David S. Miller8238b212006-10-12 00:49:15 -0700272 return ((fl1->nl_u.dn_u.daddr ^ fl2->nl_u.dn_u.daddr) |
273 (fl1->nl_u.dn_u.saddr ^ fl2->nl_u.dn_u.saddr) |
Thomas Graf47dcf0c2006-11-09 15:20:38 -0800274 (fl1->mark ^ fl2->mark) |
David S. Miller8238b212006-10-12 00:49:15 -0700275 (fl1->nl_u.dn_u.scope ^ fl2->nl_u.dn_u.scope) |
276 (fl1->oif ^ fl2->oif) |
277 (fl1->iif ^ fl2->iif)) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278}
279
280static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp)
281{
282 struct dn_route *rth, **rthp;
283 unsigned long now = jiffies;
284
285 rthp = &dn_rt_hash_table[hash].chain;
286
287 spin_lock_bh(&dn_rt_hash_table[hash].lock);
288 while((rth = *rthp) != NULL) {
289 if (compare_keys(&rth->fl, &rt->fl)) {
290 /* Put it first */
Eric Dumazet0c195c32007-02-09 16:25:52 -0800291 *rthp = rth->u.dst.dn_next;
292 rcu_assign_pointer(rth->u.dst.dn_next,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 dn_rt_hash_table[hash].chain);
294 rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth);
295
Pavel Emelyanov03f49f32007-11-10 21:28:34 -0800296 dst_use(&rth->u.dst, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 spin_unlock_bh(&dn_rt_hash_table[hash].lock);
298
299 dnrt_drop(rt);
300 *rp = rth;
301 return 0;
302 }
Eric Dumazet0c195c32007-02-09 16:25:52 -0800303 rthp = &rth->u.dst.dn_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 }
305
Eric Dumazet0c195c32007-02-09 16:25:52 -0800306 rcu_assign_pointer(rt->u.dst.dn_next, dn_rt_hash_table[hash].chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900308
Pavel Emelyanov03f49f32007-11-10 21:28:34 -0800309 dst_use(&rt->u.dst, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 spin_unlock_bh(&dn_rt_hash_table[hash].lock);
311 *rp = rt;
312 return 0;
313}
314
315void dn_run_flush(unsigned long dummy)
316{
317 int i;
318 struct dn_route *rt, *next;
319
320 for(i = 0; i < dn_rt_hash_mask; i++) {
321 spin_lock_bh(&dn_rt_hash_table[i].lock);
322
323 if ((rt = xchg(&dn_rt_hash_table[i].chain, NULL)) == NULL)
324 goto nothing_to_declare;
325
326 for(; rt; rt=next) {
Eric Dumazet0c195c32007-02-09 16:25:52 -0800327 next = rt->u.dst.dn_next;
328 rt->u.dst.dn_next = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 dst_free((struct dst_entry *)rt);
330 }
331
332nothing_to_declare:
333 spin_unlock_bh(&dn_rt_hash_table[i].lock);
334 }
335}
336
337static DEFINE_SPINLOCK(dn_rt_flush_lock);
338
339void dn_rt_cache_flush(int delay)
340{
341 unsigned long now = jiffies;
342 int user_mode = !in_interrupt();
343
344 if (delay < 0)
345 delay = dn_rt_min_delay;
346
347 spin_lock_bh(&dn_rt_flush_lock);
348
349 if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) {
350 long tmo = (long)(dn_rt_deadline - now);
351
352 if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay)
353 tmo = 0;
354
355 if (delay > tmo)
356 delay = tmo;
357 }
358
359 if (delay <= 0) {
360 spin_unlock_bh(&dn_rt_flush_lock);
361 dn_run_flush(0);
362 return;
363 }
364
365 if (dn_rt_deadline == 0)
366 dn_rt_deadline = now + dn_rt_max_delay;
367
368 dn_rt_flush_timer.expires = now + delay;
369 add_timer(&dn_rt_flush_timer);
370 spin_unlock_bh(&dn_rt_flush_lock);
371}
372
373/**
374 * dn_return_short - Return a short packet to its sender
375 * @skb: The packet to return
376 *
377 */
378static int dn_return_short(struct sk_buff *skb)
379{
380 struct dn_skb_cb *cb;
381 unsigned char *ptr;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800382 __le16 *src;
383 __le16 *dst;
384 __le16 tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
386 /* Add back headers */
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700387 skb_push(skb, skb->data - skb_network_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
389 if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
390 return NET_RX_DROP;
391
392 cb = DN_SKB_CB(skb);
393 /* Skip packet length and point to flags */
394 ptr = skb->data + 2;
395 *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
396
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800397 dst = (__le16 *)ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 ptr += 2;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800399 src = (__le16 *)ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 ptr += 2;
401 *ptr = 0; /* Zero hop count */
402
403 /* Swap source and destination */
404 tmp = *src;
405 *src = *dst;
406 *dst = tmp;
407
408 skb->pkt_type = PACKET_OUTGOING;
409 dn_rt_finish_output(skb, NULL, NULL);
410 return NET_RX_SUCCESS;
411}
412
413/**
414 * dn_return_long - Return a long packet to its sender
415 * @skb: The long format packet to return
416 *
417 */
418static int dn_return_long(struct sk_buff *skb)
419{
420 struct dn_skb_cb *cb;
421 unsigned char *ptr;
422 unsigned char *src_addr, *dst_addr;
423 unsigned char tmp[ETH_ALEN];
424
425 /* Add back all headers */
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700426 skb_push(skb, skb->data - skb_network_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
428 if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
429 return NET_RX_DROP;
430
431 cb = DN_SKB_CB(skb);
432 /* Ignore packet length and point to flags */
433 ptr = skb->data + 2;
434
435 /* Skip padding */
436 if (*ptr & DN_RT_F_PF) {
437 char padlen = (*ptr & ~DN_RT_F_PF);
438 ptr += padlen;
439 }
440
441 *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
442 ptr += 2;
443 dst_addr = ptr;
444 ptr += 8;
445 src_addr = ptr;
446 ptr += 6;
447 *ptr = 0; /* Zero hop count */
448
449 /* Swap source and destination */
450 memcpy(tmp, src_addr, ETH_ALEN);
451 memcpy(src_addr, dst_addr, ETH_ALEN);
452 memcpy(dst_addr, tmp, ETH_ALEN);
453
454 skb->pkt_type = PACKET_OUTGOING;
455 dn_rt_finish_output(skb, dst_addr, src_addr);
456 return NET_RX_SUCCESS;
457}
458
459/**
460 * dn_route_rx_packet - Try and find a route for an incoming packet
461 * @skb: The packet to find a route for
462 *
463 * Returns: result of input function if route is found, error code otherwise
464 */
465static int dn_route_rx_packet(struct sk_buff *skb)
466{
467 struct dn_skb_cb *cb = DN_SKB_CB(skb);
468 int err;
469
470 if ((err = dn_route_input(skb)) == 0)
471 return dst_input(skb);
472
473 if (decnet_debug_level & 4) {
474 char *devname = skb->dev ? skb->dev->name : "???";
475 struct dn_skb_cb *cb = DN_SKB_CB(skb);
476 printk(KERN_DEBUG
477 "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n",
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800478 (int)cb->rt_flags, devname, skb->len,
479 dn_ntohs(cb->src), dn_ntohs(cb->dst),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 err, skb->pkt_type);
481 }
482
483 if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) {
484 switch(cb->rt_flags & DN_RT_PKT_MSK) {
485 case DN_RT_PKT_SHORT:
486 return dn_return_short(skb);
487 case DN_RT_PKT_LONG:
488 return dn_return_long(skb);
489 }
490 }
491
492 kfree_skb(skb);
493 return NET_RX_DROP;
494}
495
496static int dn_route_rx_long(struct sk_buff *skb)
497{
498 struct dn_skb_cb *cb = DN_SKB_CB(skb);
499 unsigned char *ptr = skb->data;
500
501 if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */
502 goto drop_it;
503
504 skb_pull(skb, 20);
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300505 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900507 /* Destination info */
508 ptr += 2;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800509 cb->dst = dn_eth2dn(ptr);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900510 if (memcmp(ptr, dn_hiord_addr, 4) != 0)
511 goto drop_it;
512 ptr += 6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
514
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900515 /* Source info */
516 ptr += 2;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800517 cb->src = dn_eth2dn(ptr);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900518 if (memcmp(ptr, dn_hiord_addr, 4) != 0)
519 goto drop_it;
520 ptr += 6;
521 /* Other junk */
522 ptr++;
523 cb->hops = *ptr++; /* Visit Count */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
525 return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet);
526
527drop_it:
528 kfree_skb(skb);
529 return NET_RX_DROP;
530}
531
532
533
534static int dn_route_rx_short(struct sk_buff *skb)
535{
536 struct dn_skb_cb *cb = DN_SKB_CB(skb);
537 unsigned char *ptr = skb->data;
538
539 if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */
540 goto drop_it;
541
542 skb_pull(skb, 5);
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300543 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800545 cb->dst = *(__le16 *)ptr;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900546 ptr += 2;
547 cb->src = *(__le16 *)ptr;
548 ptr += 2;
549 cb->hops = *ptr & 0x3f;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551 return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet);
552
553drop_it:
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900554 kfree_skb(skb);
555 return NET_RX_DROP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556}
557
558static int dn_route_discard(struct sk_buff *skb)
559{
560 /*
561 * I know we drop the packet here, but thats considered success in
562 * this case
563 */
564 kfree_skb(skb);
565 return NET_RX_SUCCESS;
566}
567
568static int dn_route_ptp_hello(struct sk_buff *skb)
569{
570 dn_dev_hello(skb);
571 dn_neigh_pointopoint_hello(skb);
572 return NET_RX_SUCCESS;
573}
574
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700575int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576{
577 struct dn_skb_cb *cb;
578 unsigned char flags = 0;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800579 __u16 len = dn_ntohs(*(__le16 *)skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr;
581 unsigned char padlen = 0;
582
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900583 if (dev_net(dev) != &init_net)
Eric W. Biedermane730c152007-09-17 11:53:39 -0700584 goto dump_it;
585
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 if (dn == NULL)
587 goto dump_it;
588
589 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
590 goto out;
591
592 if (!pskb_may_pull(skb, 3))
593 goto dump_it;
594
595 skb_pull(skb, 2);
596
597 if (len > skb->len)
598 goto dump_it;
599
600 skb_trim(skb, len);
601
602 flags = *skb->data;
603
604 cb = DN_SKB_CB(skb);
605 cb->stamp = jiffies;
606 cb->iif = dev->ifindex;
607
608 /*
609 * If we have padding, remove it.
610 */
611 if (flags & DN_RT_F_PF) {
612 padlen = flags & ~DN_RT_F_PF;
613 if (!pskb_may_pull(skb, padlen + 1))
614 goto dump_it;
615 skb_pull(skb, padlen);
616 flags = *skb->data;
617 }
618
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700619 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
621 /*
622 * Weed out future version DECnet
623 */
624 if (flags & DN_RT_F_VER)
625 goto dump_it;
626
627 cb->rt_flags = flags;
628
629 if (decnet_debug_level & 1)
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900630 printk(KERN_DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n",
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900632 (int)flags, (dev) ? dev->name : "???", len, skb->len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 padlen);
634
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900635 if (flags & DN_RT_PKT_CNTL) {
Herbert Xu364c6ba2006-06-09 16:10:40 -0700636 if (unlikely(skb_linearize(skb)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 goto dump_it;
638
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900639 switch(flags & DN_RT_CNTL_MSK) {
640 case DN_RT_PKT_INIT:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 dn_dev_init_pkt(skb);
642 break;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900643 case DN_RT_PKT_VERI:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 dn_dev_veri_pkt(skb);
645 break;
646 }
647
648 if (dn->parms.state != DN_DEV_S_RU)
649 goto dump_it;
650
651 switch(flags & DN_RT_CNTL_MSK) {
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900652 case DN_RT_PKT_HELO:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_route_ptp_hello);
654
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900655 case DN_RT_PKT_L1RT:
656 case DN_RT_PKT_L2RT:
657 return NF_HOOK(PF_DECnet, NF_DN_ROUTE, skb, skb->dev, NULL, dn_route_discard);
658 case DN_RT_PKT_ERTH:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_router_hello);
660
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900661 case DN_RT_PKT_EEDH:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_endnode_hello);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900663 }
664 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 if (dn->parms.state != DN_DEV_S_RU)
666 goto dump_it;
667
668 skb_pull(skb, 1); /* Pull flags */
669
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900670 switch(flags & DN_RT_PKT_MSK) {
671 case DN_RT_PKT_LONG:
672 return dn_route_rx_long(skb);
673 case DN_RT_PKT_SHORT:
674 return dn_route_rx_short(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 }
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900676 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
678dump_it:
679 kfree_skb(skb);
680out:
681 return NET_RX_DROP;
682}
683
684static int dn_output(struct sk_buff *skb)
685{
686 struct dst_entry *dst = skb->dst;
687 struct dn_route *rt = (struct dn_route *)dst;
688 struct net_device *dev = dst->dev;
689 struct dn_skb_cb *cb = DN_SKB_CB(skb);
690 struct neighbour *neigh;
691
692 int err = -EINVAL;
693
694 if ((neigh = dst->neighbour) == NULL)
695 goto error;
696
697 skb->dev = dev;
698
699 cb->src = rt->rt_saddr;
700 cb->dst = rt->rt_daddr;
701
702 /*
703 * Always set the Intra-Ethernet bit on all outgoing packets
704 * originated on this node. Only valid flag from upper layers
705 * is return-to-sender-requested. Set hop count to 0 too.
706 */
707 cb->rt_flags &= ~DN_RT_F_RQR;
708 cb->rt_flags |= DN_RT_F_IE;
709 cb->hops = 0;
710
711 return NF_HOOK(PF_DECnet, NF_DN_LOCAL_OUT, skb, NULL, dev, neigh->output);
712
713error:
714 if (net_ratelimit())
715 printk(KERN_DEBUG "dn_output: This should not happen\n");
716
717 kfree_skb(skb);
718
719 return err;
720}
721
722static int dn_forward(struct sk_buff *skb)
723{
724 struct dn_skb_cb *cb = DN_SKB_CB(skb);
725 struct dst_entry *dst = skb->dst;
726 struct dn_dev *dn_db = dst->dev->dn_ptr;
727 struct dn_route *rt;
728 struct neighbour *neigh = dst->neighbour;
729 int header_len;
730#ifdef CONFIG_NETFILTER
731 struct net_device *dev = skb->dev;
732#endif
733
734 if (skb->pkt_type != PACKET_HOST)
735 goto drop;
736
737 /* Ensure that we have enough space for headers */
738 rt = (struct dn_route *)skb->dst;
739 header_len = dn_db->use_long ? 21 : 6;
740 if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+header_len))
741 goto drop;
742
743 /*
744 * Hop count exceeded.
745 */
746 if (++cb->hops > 30)
747 goto drop;
748
749 skb->dev = rt->u.dst.dev;
750
751 /*
752 * If packet goes out same interface it came in on, then set
753 * the Intra-Ethernet bit. This has no effect for short
754 * packets, so we don't need to test for them here.
755 */
756 cb->rt_flags &= ~DN_RT_F_IE;
757 if (rt->rt_flags & RTCF_DOREDIRECT)
758 cb->rt_flags |= DN_RT_F_IE;
759
760 return NF_HOOK(PF_DECnet, NF_DN_FORWARD, skb, dev, skb->dev, neigh->output);
761
762drop:
763 kfree_skb(skb);
764 return NET_RX_DROP;
765}
766
767/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 * Used to catch bugs. This should never normally get
769 * called.
770 */
771static int dn_rt_bug(struct sk_buff *skb)
772{
773 if (net_ratelimit()) {
774 struct dn_skb_cb *cb = DN_SKB_CB(skb);
775
776 printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n",
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800777 dn_ntohs(cb->src), dn_ntohs(cb->dst));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 }
779
780 kfree_skb(skb);
781
782 return NET_RX_BAD;
783}
784
785static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
786{
787 struct dn_fib_info *fi = res->fi;
788 struct net_device *dev = rt->u.dst.dev;
789 struct neighbour *n;
790 unsigned mss;
791
792 if (fi) {
793 if (DN_FIB_RES_GW(*res) &&
794 DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
795 rt->rt_gateway = DN_FIB_RES_GW(*res);
796 memcpy(rt->u.dst.metrics, fi->fib_metrics,
797 sizeof(rt->u.dst.metrics));
798 }
799 rt->rt_type = res->type;
800
801 if (dev != NULL && rt->u.dst.neighbour == NULL) {
802 n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev);
803 if (IS_ERR(n))
804 return PTR_ERR(n);
805 rt->u.dst.neighbour = n;
806 }
807
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900808 if (rt->u.dst.metrics[RTAX_MTU-1] == 0 ||
809 rt->u.dst.metrics[RTAX_MTU-1] > rt->u.dst.dev->mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu;
811 mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->u.dst));
812 if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0 ||
813 rt->u.dst.metrics[RTAX_ADVMSS-1] > mss)
814 rt->u.dst.metrics[RTAX_ADVMSS-1] = mss;
815 return 0;
816}
817
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800818static inline int dn_match_addr(__le16 addr1, __le16 addr2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819{
820 __u16 tmp = dn_ntohs(addr1) ^ dn_ntohs(addr2);
821 int match = 16;
822 while(tmp) {
823 tmp >>= 1;
824 match--;
825 }
826 return match;
827}
828
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800829static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830{
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800831 __le16 saddr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 struct dn_dev *dn_db = dev->dn_ptr;
833 struct dn_ifaddr *ifa;
834 int best_match = 0;
835 int ret;
836
837 read_lock(&dev_base_lock);
838 for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
839 if (ifa->ifa_scope > scope)
840 continue;
841 if (!daddr) {
842 saddr = ifa->ifa_local;
843 break;
844 }
845 ret = dn_match_addr(daddr, ifa->ifa_local);
846 if (ret > best_match)
847 saddr = ifa->ifa_local;
848 if (best_match == 0)
849 saddr = ifa->ifa_local;
850 }
851 read_unlock(&dev_base_lock);
852
853 return saddr;
854}
855
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800856static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857{
858 return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope);
859}
860
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800861static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862{
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800863 __le16 mask = dnet_make_mask(res->prefixlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 return (daddr&~mask)|res->fi->fib_nh->nh_gw;
865}
866
867static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard)
868{
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900869 struct flowi fl = { .nl_u = { .dn_u =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 { .daddr = oldflp->fld_dst,
871 .saddr = oldflp->fld_src,
872 .scope = RT_SCOPE_UNIVERSE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 } },
Thomas Graf47dcf0c2006-11-09 15:20:38 -0800874 .mark = oldflp->mark,
Eric W. Biederman2774c7a2007-09-26 22:10:56 -0700875 .iif = init_net.loopback_dev->ifindex,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 .oif = oldflp->oif };
877 struct dn_route *rt = NULL;
Pavel Emelianov7562f872007-05-03 15:13:45 -0700878 struct net_device *dev_out = NULL, *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 struct neighbour *neigh = NULL;
880 unsigned hash;
881 unsigned flags = 0;
882 struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST };
883 int err;
884 int free_res = 0;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800885 __le16 gateway = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
887 if (decnet_debug_level & 16)
888 printk(KERN_DEBUG
889 "dn_route_output_slow: dst=%04x src=%04x mark=%d"
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800890 " iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst),
891 dn_ntohs(oldflp->fld_src),
Eric W. Biederman2774c7a2007-09-26 22:10:56 -0700892 oldflp->mark, init_net.loopback_dev->ifindex, oldflp->oif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
894 /* If we have an output interface, verify its a DECnet device */
895 if (oldflp->oif) {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700896 dev_out = dev_get_by_index(&init_net, oldflp->oif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 err = -ENODEV;
898 if (dev_out && dev_out->dn_ptr == NULL) {
899 dev_put(dev_out);
900 dev_out = NULL;
901 }
902 if (dev_out == NULL)
903 goto out;
904 }
905
906 /* If we have a source address, verify that its a local address */
907 if (oldflp->fld_src) {
908 err = -EADDRNOTAVAIL;
909
910 if (dev_out) {
911 if (dn_dev_islocal(dev_out, oldflp->fld_src))
912 goto source_ok;
913 dev_put(dev_out);
914 goto out;
915 }
916 read_lock(&dev_base_lock);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700917 for_each_netdev(&init_net, dev) {
Pavel Emelianov7562f872007-05-03 15:13:45 -0700918 if (!dev->dn_ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 continue;
Pavel Emelianov7562f872007-05-03 15:13:45 -0700920 if (!dn_dev_islocal(dev, oldflp->fld_src))
Patrick Caulfield9bbf28a12006-08-02 14:14:44 -0700921 continue;
Pavel Emelianov7562f872007-05-03 15:13:45 -0700922 if ((dev->flags & IFF_LOOPBACK) &&
Patrick Caulfield9bbf28a12006-08-02 14:14:44 -0700923 oldflp->fld_dst &&
Pavel Emelianov7562f872007-05-03 15:13:45 -0700924 !dn_dev_islocal(dev, oldflp->fld_dst))
Patrick Caulfield9bbf28a12006-08-02 14:14:44 -0700925 continue;
Pavel Emelianov7562f872007-05-03 15:13:45 -0700926
927 dev_out = dev;
Patrick Caulfield9bbf28a12006-08-02 14:14:44 -0700928 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 }
930 read_unlock(&dev_base_lock);
931 if (dev_out == NULL)
932 goto out;
933 dev_hold(dev_out);
934source_ok:
935 ;
936 }
937
938 /* No destination? Assume its local */
939 if (!fl.fld_dst) {
940 fl.fld_dst = fl.fld_src;
941
942 err = -EADDRNOTAVAIL;
943 if (dev_out)
944 dev_put(dev_out);
Eric W. Biederman2774c7a2007-09-26 22:10:56 -0700945 dev_out = init_net.loopback_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 dev_hold(dev_out);
947 if (!fl.fld_dst) {
948 fl.fld_dst =
949 fl.fld_src = dnet_select_source(dev_out, 0,
950 RT_SCOPE_HOST);
951 if (!fl.fld_dst)
952 goto out;
953 }
Eric W. Biederman2774c7a2007-09-26 22:10:56 -0700954 fl.oif = init_net.loopback_dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 res.type = RTN_LOCAL;
956 goto make_route;
957 }
958
959 if (decnet_debug_level & 16)
960 printk(KERN_DEBUG
961 "dn_route_output_slow: initial checks complete."
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800962 " dst=%o4x src=%04x oif=%d try_hard=%d\n",
963 dn_ntohs(fl.fld_dst), dn_ntohs(fl.fld_src),
964 fl.oif, try_hard);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
966 /*
967 * N.B. If the kernel is compiled without router support then
968 * dn_fib_lookup() will evaluate to non-zero so this if () block
969 * will always be executed.
970 */
971 err = -ESRCH;
972 if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) {
973 struct dn_dev *dn_db;
974 if (err != -ESRCH)
975 goto out;
976 /*
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900977 * Here the fallback is basically the standard algorithm for
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 * routing in endnodes which is described in the DECnet routing
979 * docs
980 *
981 * If we are not trying hard, look in neighbour cache.
982 * The result is tested to ensure that if a specific output
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900983 * device/source address was requested, then we honour that
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 * here
985 */
986 if (!try_hard) {
Eric W. Biederman426b5302008-01-24 00:13:18 -0800987 neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fl.fld_dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 if (neigh) {
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900989 if ((oldflp->oif &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 (neigh->dev->ifindex != oldflp->oif)) ||
991 (oldflp->fld_src &&
992 (!dn_dev_islocal(neigh->dev,
993 oldflp->fld_src)))) {
994 neigh_release(neigh);
995 neigh = NULL;
996 } else {
997 if (dev_out)
998 dev_put(dev_out);
999 if (dn_dev_islocal(neigh->dev, fl.fld_dst)) {
Eric W. Biederman2774c7a2007-09-26 22:10:56 -07001000 dev_out = init_net.loopback_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 res.type = RTN_LOCAL;
1002 } else {
1003 dev_out = neigh->dev;
1004 }
1005 dev_hold(dev_out);
1006 goto select_source;
1007 }
1008 }
1009 }
1010
1011 /* Not there? Perhaps its a local address */
1012 if (dev_out == NULL)
1013 dev_out = dn_dev_get_default();
1014 err = -ENODEV;
1015 if (dev_out == NULL)
1016 goto out;
1017 dn_db = dev_out->dn_ptr;
1018 /* Possible improvement - check all devices for local addr */
1019 if (dn_dev_islocal(dev_out, fl.fld_dst)) {
1020 dev_put(dev_out);
Eric W. Biederman2774c7a2007-09-26 22:10:56 -07001021 dev_out = init_net.loopback_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 dev_hold(dev_out);
1023 res.type = RTN_LOCAL;
1024 goto select_source;
1025 }
1026 /* Not local either.... try sending it to the default router */
1027 neigh = neigh_clone(dn_db->router);
1028 BUG_ON(neigh && neigh->dev != dev_out);
1029
1030 /* Ok then, we assume its directly connected and move on */
1031select_source:
1032 if (neigh)
1033 gateway = ((struct dn_neigh *)neigh)->addr;
1034 if (gateway == 0)
1035 gateway = fl.fld_dst;
1036 if (fl.fld_src == 0) {
1037 fl.fld_src = dnet_select_source(dev_out, gateway,
1038 res.type == RTN_LOCAL ?
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001039 RT_SCOPE_HOST :
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 RT_SCOPE_LINK);
1041 if (fl.fld_src == 0 && res.type != RTN_LOCAL)
1042 goto e_addr;
1043 }
1044 fl.oif = dev_out->ifindex;
1045 goto make_route;
1046 }
1047 free_res = 1;
1048
1049 if (res.type == RTN_NAT)
1050 goto e_inval;
1051
1052 if (res.type == RTN_LOCAL) {
1053 if (!fl.fld_src)
1054 fl.fld_src = fl.fld_dst;
1055 if (dev_out)
1056 dev_put(dev_out);
Eric W. Biederman2774c7a2007-09-26 22:10:56 -07001057 dev_out = init_net.loopback_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 dev_hold(dev_out);
1059 fl.oif = dev_out->ifindex;
1060 if (res.fi)
1061 dn_fib_info_put(res.fi);
1062 res.fi = NULL;
1063 goto make_route;
1064 }
1065
1066 if (res.fi->fib_nhs > 1 && fl.oif == 0)
1067 dn_fib_select_multipath(&fl, &res);
1068
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001069 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 * We could add some logic to deal with default routes here and
1071 * get rid of some of the special casing above.
1072 */
1073
1074 if (!fl.fld_src)
1075 fl.fld_src = DN_FIB_RES_PREFSRC(res);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001076
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 if (dev_out)
1078 dev_put(dev_out);
1079 dev_out = DN_FIB_RES_DEV(res);
1080 dev_hold(dev_out);
1081 fl.oif = dev_out->ifindex;
1082 gateway = DN_FIB_RES_GW(res);
1083
1084make_route:
1085 if (dev_out->flags & IFF_LOOPBACK)
1086 flags |= RTCF_LOCAL;
1087
1088 rt = dst_alloc(&dn_dst_ops);
1089 if (rt == NULL)
1090 goto e_nobufs;
1091
1092 atomic_set(&rt->u.dst.__refcnt, 1);
1093 rt->u.dst.flags = DST_HOST;
1094
1095 rt->fl.fld_src = oldflp->fld_src;
1096 rt->fl.fld_dst = oldflp->fld_dst;
1097 rt->fl.oif = oldflp->oif;
1098 rt->fl.iif = 0;
Thomas Graf47dcf0c2006-11-09 15:20:38 -08001099 rt->fl.mark = oldflp->mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100
1101 rt->rt_saddr = fl.fld_src;
1102 rt->rt_daddr = fl.fld_dst;
1103 rt->rt_gateway = gateway ? gateway : fl.fld_dst;
1104 rt->rt_local_src = fl.fld_src;
1105
1106 rt->rt_dst_map = fl.fld_dst;
1107 rt->rt_src_map = fl.fld_src;
1108
1109 rt->u.dst.dev = dev_out;
1110 dev_hold(dev_out);
1111 rt->u.dst.neighbour = neigh;
1112 neigh = NULL;
1113
1114 rt->u.dst.lastuse = jiffies;
1115 rt->u.dst.output = dn_output;
1116 rt->u.dst.input = dn_rt_bug;
1117 rt->rt_flags = flags;
1118 if (flags & RTCF_LOCAL)
1119 rt->u.dst.input = dn_nsp_rx;
1120
1121 err = dn_rt_set_next_hop(rt, &res);
1122 if (err)
1123 goto e_neighbour;
1124
1125 hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst);
1126 dn_insert_route(rt, hash, (struct dn_route **)pprt);
1127
1128done:
1129 if (neigh)
1130 neigh_release(neigh);
1131 if (free_res)
1132 dn_fib_res_put(&res);
1133 if (dev_out)
1134 dev_put(dev_out);
1135out:
1136 return err;
1137
1138e_addr:
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001139 err = -EADDRNOTAVAIL;
1140 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141e_inval:
1142 err = -EINVAL;
1143 goto done;
1144e_nobufs:
1145 err = -ENOBUFS;
1146 goto done;
1147e_neighbour:
1148 dst_free(&rt->u.dst);
1149 goto e_nobufs;
1150}
1151
1152
1153/*
1154 * N.B. The flags may be moved into the flowi at some future stage.
1155 */
1156static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags)
1157{
1158 unsigned hash = dn_hash(flp->fld_src, flp->fld_dst);
1159 struct dn_route *rt = NULL;
1160
1161 if (!(flags & MSG_TRYHARD)) {
1162 rcu_read_lock_bh();
1163 for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt;
Eric Dumazet0c195c32007-02-09 16:25:52 -08001164 rt = rcu_dereference(rt->u.dst.dn_next)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 if ((flp->fld_dst == rt->fl.fld_dst) &&
1166 (flp->fld_src == rt->fl.fld_src) &&
Thomas Graf47dcf0c2006-11-09 15:20:38 -08001167 (flp->mark == rt->fl.mark) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 (rt->fl.iif == 0) &&
1169 (rt->fl.oif == flp->oif)) {
Pavel Emelyanov03f49f32007-11-10 21:28:34 -08001170 dst_use(&rt->u.dst, jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 rcu_read_unlock_bh();
1172 *pprt = &rt->u.dst;
1173 return 0;
1174 }
1175 }
1176 rcu_read_unlock_bh();
1177 }
1178
1179 return dn_route_output_slow(pprt, flp, flags);
1180}
1181
1182static int dn_route_output_key(struct dst_entry **pprt, struct flowi *flp, int flags)
1183{
1184 int err;
1185
1186 err = __dn_route_output_key(pprt, flp, flags);
1187 if (err == 0 && flp->proto) {
1188 err = xfrm_lookup(pprt, flp, NULL, 0);
1189 }
1190 return err;
1191}
1192
1193int dn_route_output_sock(struct dst_entry **pprt, struct flowi *fl, struct sock *sk, int flags)
1194{
1195 int err;
1196
1197 err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD);
1198 if (err == 0 && fl->proto) {
Herbert Xubb728452007-12-12 18:48:58 -08001199 err = xfrm_lookup(pprt, fl, sk, (flags & MSG_DONTWAIT) ?
Herbert Xu96eba692007-12-13 05:24:40 -08001200 0 : XFRM_LOOKUP_WAIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 }
1202 return err;
1203}
1204
1205static int dn_route_input_slow(struct sk_buff *skb)
1206{
1207 struct dn_route *rt = NULL;
1208 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1209 struct net_device *in_dev = skb->dev;
1210 struct net_device *out_dev = NULL;
1211 struct dn_dev *dn_db;
1212 struct neighbour *neigh = NULL;
1213 unsigned hash;
1214 int flags = 0;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -08001215 __le16 gateway = 0;
1216 __le16 local_src = 0;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001217 struct flowi fl = { .nl_u = { .dn_u =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 { .daddr = cb->dst,
1219 .saddr = cb->src,
1220 .scope = RT_SCOPE_UNIVERSE,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 } },
Thomas Graf47dcf0c2006-11-09 15:20:38 -08001222 .mark = skb->mark,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 .iif = skb->dev->ifindex };
1224 struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE };
1225 int err = -EINVAL;
1226 int free_res = 0;
1227
1228 dev_hold(in_dev);
1229
1230 if ((dn_db = in_dev->dn_ptr) == NULL)
1231 goto out;
1232
1233 /* Zero source addresses are not allowed */
1234 if (fl.fld_src == 0)
1235 goto out;
1236
1237 /*
1238 * In this case we've just received a packet from a source
1239 * outside ourselves pretending to come from us. We don't
1240 * allow it any further to prevent routing loops, spoofing and
1241 * other nasties. Loopback packets already have the dst attached
1242 * so this only affects packets which have originated elsewhere.
1243 */
1244 err = -ENOTUNIQ;
1245 if (dn_dev_islocal(in_dev, cb->src))
1246 goto out;
1247
1248 err = dn_fib_lookup(&fl, &res);
1249 if (err) {
1250 if (err != -ESRCH)
1251 goto out;
1252 /*
1253 * Is the destination us ?
1254 */
1255 if (!dn_dev_islocal(in_dev, cb->dst))
1256 goto e_inval;
1257
1258 res.type = RTN_LOCAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 } else {
Steven Whitehousec4ea94a2006-03-20 22:42:39 -08001260 __le16 src_map = fl.fld_src;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 free_res = 1;
1262
1263 out_dev = DN_FIB_RES_DEV(res);
1264 if (out_dev == NULL) {
1265 if (net_ratelimit())
1266 printk(KERN_CRIT "Bug in dn_route_input_slow() "
1267 "No output device\n");
1268 goto e_inval;
1269 }
1270 dev_hold(out_dev);
1271
1272 if (res.r)
Steven Whitehousea8731cb2006-08-09 15:56:46 -07001273 src_map = fl.fld_src; /* no NAT support for now */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274
1275 gateway = DN_FIB_RES_GW(res);
1276 if (res.type == RTN_NAT) {
1277 fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res);
1278 dn_fib_res_put(&res);
1279 free_res = 0;
1280 if (dn_fib_lookup(&fl, &res))
1281 goto e_inval;
1282 free_res = 1;
1283 if (res.type != RTN_UNICAST)
1284 goto e_inval;
1285 flags |= RTCF_DNAT;
1286 gateway = fl.fld_dst;
1287 }
1288 fl.fld_src = src_map;
1289 }
1290
1291 switch(res.type) {
1292 case RTN_UNICAST:
1293 /*
1294 * Forwarding check here, we only check for forwarding
1295 * being turned off, if you want to only forward intra
1296 * area, its up to you to set the routing tables up
1297 * correctly.
1298 */
1299 if (dn_db->parms.forwarding == 0)
1300 goto e_inval;
1301
1302 if (res.fi->fib_nhs > 1 && fl.oif == 0)
1303 dn_fib_select_multipath(&fl, &res);
1304
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001305 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT
1307 * flag as a hint to set the intra-ethernet bit when
1308 * forwarding. If we've got NAT in operation, we don't do
1309 * this optimisation.
1310 */
1311 if (out_dev == in_dev && !(flags & RTCF_NAT))
1312 flags |= RTCF_DOREDIRECT;
1313
1314 local_src = DN_FIB_RES_PREFSRC(res);
1315
1316 case RTN_BLACKHOLE:
1317 case RTN_UNREACHABLE:
1318 break;
1319 case RTN_LOCAL:
1320 flags |= RTCF_LOCAL;
1321 fl.fld_src = cb->dst;
1322 fl.fld_dst = cb->src;
1323
1324 /* Routing tables gave us a gateway */
1325 if (gateway)
1326 goto make_route;
1327
1328 /* Packet was intra-ethernet, so we know its on-link */
Steven Whitehouse3a31b9d2006-10-18 20:45:22 -07001329 if (cb->rt_flags & DN_RT_F_IE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 gateway = cb->src;
1331 flags |= RTCF_DIRECTSRC;
1332 goto make_route;
1333 }
1334
1335 /* Use the default router if there is one */
1336 neigh = neigh_clone(dn_db->router);
1337 if (neigh) {
1338 gateway = ((struct dn_neigh *)neigh)->addr;
1339 goto make_route;
1340 }
1341
1342 /* Close eyes and pray */
1343 gateway = cb->src;
1344 flags |= RTCF_DIRECTSRC;
1345 goto make_route;
1346 default:
1347 goto e_inval;
1348 }
1349
1350make_route:
1351 rt = dst_alloc(&dn_dst_ops);
1352 if (rt == NULL)
1353 goto e_nobufs;
1354
1355 rt->rt_saddr = fl.fld_src;
1356 rt->rt_daddr = fl.fld_dst;
1357 rt->rt_gateway = fl.fld_dst;
1358 if (gateway)
1359 rt->rt_gateway = gateway;
1360 rt->rt_local_src = local_src ? local_src : rt->rt_saddr;
1361
1362 rt->rt_dst_map = fl.fld_dst;
1363 rt->rt_src_map = fl.fld_src;
1364
1365 rt->fl.fld_src = cb->src;
1366 rt->fl.fld_dst = cb->dst;
1367 rt->fl.oif = 0;
1368 rt->fl.iif = in_dev->ifindex;
Thomas Graf47dcf0c2006-11-09 15:20:38 -08001369 rt->fl.mark = fl.mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370
1371 rt->u.dst.flags = DST_HOST;
1372 rt->u.dst.neighbour = neigh;
1373 rt->u.dst.dev = out_dev;
1374 rt->u.dst.lastuse = jiffies;
1375 rt->u.dst.output = dn_rt_bug;
1376 switch(res.type) {
1377 case RTN_UNICAST:
1378 rt->u.dst.input = dn_forward;
1379 break;
1380 case RTN_LOCAL:
1381 rt->u.dst.output = dn_output;
1382 rt->u.dst.input = dn_nsp_rx;
1383 rt->u.dst.dev = in_dev;
1384 flags |= RTCF_LOCAL;
1385 break;
1386 default:
1387 case RTN_UNREACHABLE:
1388 case RTN_BLACKHOLE:
Herbert Xu352e5122007-11-13 21:34:06 -08001389 rt->u.dst.input = dst_discard;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 }
1391 rt->rt_flags = flags;
1392 if (rt->u.dst.dev)
1393 dev_hold(rt->u.dst.dev);
1394
1395 err = dn_rt_set_next_hop(rt, &res);
1396 if (err)
1397 goto e_neighbour;
1398
1399 hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst);
1400 dn_insert_route(rt, hash, (struct dn_route **)&skb->dst);
1401
1402done:
1403 if (neigh)
1404 neigh_release(neigh);
1405 if (free_res)
1406 dn_fib_res_put(&res);
1407 dev_put(in_dev);
1408 if (out_dev)
1409 dev_put(out_dev);
1410out:
1411 return err;
1412
1413e_inval:
1414 err = -EINVAL;
1415 goto done;
1416
1417e_nobufs:
1418 err = -ENOBUFS;
1419 goto done;
1420
1421e_neighbour:
1422 dst_free(&rt->u.dst);
1423 goto done;
1424}
1425
1426int dn_route_input(struct sk_buff *skb)
1427{
1428 struct dn_route *rt;
1429 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1430 unsigned hash = dn_hash(cb->src, cb->dst);
1431
1432 if (skb->dst)
1433 return 0;
1434
1435 rcu_read_lock();
1436 for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL;
Eric Dumazet0c195c32007-02-09 16:25:52 -08001437 rt = rcu_dereference(rt->u.dst.dn_next)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 if ((rt->fl.fld_src == cb->src) &&
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001439 (rt->fl.fld_dst == cb->dst) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 (rt->fl.oif == 0) &&
Thomas Graf47dcf0c2006-11-09 15:20:38 -08001441 (rt->fl.mark == skb->mark) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 (rt->fl.iif == cb->iif)) {
Pavel Emelyanov03f49f32007-11-10 21:28:34 -08001443 dst_use(&rt->u.dst, jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 rcu_read_unlock();
1445 skb->dst = (struct dst_entry *)rt;
1446 return 0;
1447 }
1448 }
1449 rcu_read_unlock();
1450
1451 return dn_route_input_slow(skb);
1452}
1453
Jamal Hadi Salimb6544c02005-06-18 22:54:12 -07001454static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1455 int event, int nowait, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456{
1457 struct dn_route *rt = (struct dn_route *)skb->dst;
1458 struct rtmsg *r;
1459 struct nlmsghdr *nlh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001460 unsigned char *b = skb_tail_pointer(skb);
Thomas Grafe3703b32006-11-27 09:27:07 -08001461 long expires;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462
Jamal Hadi Salimb6544c02005-06-18 22:54:12 -07001463 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464 r = NLMSG_DATA(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 r->rtm_family = AF_DECnet;
1466 r->rtm_dst_len = 16;
1467 r->rtm_src_len = 0;
1468 r->rtm_tos = 0;
1469 r->rtm_table = RT_TABLE_MAIN;
Patrick McHardy9e762a42006-08-10 23:09:48 -07001470 RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 r->rtm_type = rt->rt_type;
1472 r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
1473 r->rtm_scope = RT_SCOPE_UNIVERSE;
1474 r->rtm_protocol = RTPROT_UNSPEC;
1475 if (rt->rt_flags & RTCF_NOTIFY)
1476 r->rtm_flags |= RTM_F_NOTIFY;
1477 RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr);
1478 if (rt->fl.fld_src) {
1479 r->rtm_src_len = 16;
1480 RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src);
1481 }
1482 if (rt->u.dst.dev)
1483 RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex);
1484 /*
1485 * Note to self - change this if input routes reverse direction when
1486 * they deal only with inputs and not with replies like they do
1487 * currently.
1488 */
1489 RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src);
1490 if (rt->rt_daddr != rt->rt_gateway)
1491 RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway);
1492 if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
1493 goto rtattr_failure;
Thomas Grafe3703b32006-11-27 09:27:07 -08001494 expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0;
1495 if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, expires,
1496 rt->u.dst.error) < 0)
1497 goto rtattr_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 if (rt->fl.iif)
1499 RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif);
1500
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001501 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 return skb->len;
1503
1504nlmsg_failure:
1505rtattr_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -07001506 nlmsg_trim(skb, b);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001507 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508}
1509
1510/*
1511 * This is called by both endnodes and routers now.
1512 */
Thomas Graffa34ddd2007-03-22 11:57:46 -07001513static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001515 struct net *net = sock_net(in_skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 struct rtattr **rta = arg;
1517 struct rtmsg *rtm = NLMSG_DATA(nlh);
1518 struct dn_route *rt = NULL;
1519 struct dn_skb_cb *cb;
1520 int err;
1521 struct sk_buff *skb;
1522 struct flowi fl;
1523
Denis V. Lunevb8542722007-12-01 00:21:31 +11001524 if (net != &init_net)
1525 return -EINVAL;
1526
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 memset(&fl, 0, sizeof(fl));
1528 fl.proto = DNPROTO_NSP;
1529
1530 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1531 if (skb == NULL)
1532 return -ENOBUFS;
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -07001533 skb_reset_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 cb = DN_SKB_CB(skb);
1535
1536 if (rta[RTA_SRC-1])
1537 memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2);
1538 if (rta[RTA_DST-1])
1539 memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2);
1540 if (rta[RTA_IIF-1])
1541 memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
1542
1543 if (fl.iif) {
1544 struct net_device *dev;
Eric W. Biederman881d9662007-09-17 11:56:21 -07001545 if ((dev = dev_get_by_index(&init_net, fl.iif)) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546 kfree_skb(skb);
1547 return -ENODEV;
1548 }
1549 if (!dev->dn_ptr) {
1550 dev_put(dev);
1551 kfree_skb(skb);
1552 return -ENODEV;
1553 }
YOSHIFUJI Hideakib98999d2007-12-12 03:51:49 +09001554 skb->protocol = htons(ETH_P_DNA_RT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555 skb->dev = dev;
1556 cb->src = fl.fld_src;
1557 cb->dst = fl.fld_dst;
1558 local_bh_disable();
1559 err = dn_route_input(skb);
1560 local_bh_enable();
1561 memset(cb, 0, sizeof(struct dn_skb_cb));
1562 rt = (struct dn_route *)skb->dst;
1563 if (!err && -rt->u.dst.error)
1564 err = rt->u.dst.error;
1565 } else {
1566 int oif = 0;
1567 if (rta[RTA_OIF - 1])
1568 memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int));
1569 fl.oif = oif;
1570 err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0);
1571 }
1572
1573 if (skb->dev)
1574 dev_put(skb->dev);
1575 skb->dev = NULL;
1576 if (err)
1577 goto out_free;
1578 skb->dst = &rt->u.dst;
1579 if (rtm->rtm_flags & RTM_F_NOTIFY)
1580 rt->rt_flags |= RTCF_NOTIFY;
1581
Jamal Hadi Salimb6544c02005-06-18 22:54:12 -07001582 err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583
1584 if (err == 0)
1585 goto out_free;
1586 if (err < 0) {
1587 err = -EMSGSIZE;
1588 goto out_free;
1589 }
1590
Denis V. Lunev97c53ca2007-11-19 22:26:51 -08001591 return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592
1593out_free:
1594 kfree_skb(skb);
1595 return err;
1596}
1597
1598/*
1599 * For routers, this is called from dn_fib_dump, but for endnodes its
1600 * called directly from the rtnetlink dispatch table.
1601 */
1602int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb)
1603{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001604 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 struct dn_route *rt;
1606 int h, s_h;
1607 int idx, s_idx;
1608
Denis V. Lunevb8542722007-12-01 00:21:31 +11001609 if (net != &init_net)
1610 return 0;
1611
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612 if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg))
1613 return -EINVAL;
1614 if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED))
1615 return 0;
1616
1617 s_h = cb->args[0];
1618 s_idx = idx = cb->args[1];
1619 for(h = 0; h <= dn_rt_hash_mask; h++) {
1620 if (h < s_h)
1621 continue;
1622 if (h > s_h)
1623 s_idx = 0;
1624 rcu_read_lock_bh();
1625 for(rt = rcu_dereference(dn_rt_hash_table[h].chain), idx = 0;
1626 rt;
Eric Dumazet0c195c32007-02-09 16:25:52 -08001627 rt = rcu_dereference(rt->u.dst.dn_next), idx++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628 if (idx < s_idx)
1629 continue;
1630 skb->dst = dst_clone(&rt->u.dst);
1631 if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid,
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001632 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
Jamal Hadi Salimb6544c02005-06-18 22:54:12 -07001633 1, NLM_F_MULTI) <= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 dst_release(xchg(&skb->dst, NULL));
1635 rcu_read_unlock_bh();
1636 goto done;
1637 }
1638 dst_release(xchg(&skb->dst, NULL));
1639 }
1640 rcu_read_unlock_bh();
1641 }
1642
1643done:
1644 cb->args[0] = h;
1645 cb->args[1] = idx;
1646 return skb->len;
1647}
1648
1649#ifdef CONFIG_PROC_FS
1650struct dn_rt_cache_iter_state {
1651 int bucket;
1652};
1653
1654static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq)
1655{
1656 struct dn_route *rt = NULL;
1657 struct dn_rt_cache_iter_state *s = seq->private;
1658
1659 for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) {
1660 rcu_read_lock_bh();
1661 rt = dn_rt_hash_table[s->bucket].chain;
1662 if (rt)
1663 break;
1664 rcu_read_unlock_bh();
1665 }
Eric Dumazet0d89d792008-01-10 22:35:21 -08001666 return rcu_dereference(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667}
1668
1669static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt)
1670{
Eric Dumazet0d89d792008-01-10 22:35:21 -08001671 struct dn_rt_cache_iter_state *s = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672
Eric Dumazet0c195c32007-02-09 16:25:52 -08001673 rt = rt->u.dst.dn_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 while(!rt) {
1675 rcu_read_unlock_bh();
1676 if (--s->bucket < 0)
1677 break;
1678 rcu_read_lock_bh();
1679 rt = dn_rt_hash_table[s->bucket].chain;
1680 }
Eric Dumazet0d89d792008-01-10 22:35:21 -08001681 return rcu_dereference(rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682}
1683
1684static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
1685{
1686 struct dn_route *rt = dn_rt_cache_get_first(seq);
1687
1688 if (rt) {
1689 while(*pos && (rt = dn_rt_cache_get_next(seq, rt)))
1690 --*pos;
1691 }
1692 return *pos ? NULL : rt;
1693}
1694
1695static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1696{
1697 struct dn_route *rt = dn_rt_cache_get_next(seq, v);
1698 ++*pos;
1699 return rt;
1700}
1701
1702static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v)
1703{
1704 if (v)
1705 rcu_read_unlock_bh();
1706}
1707
1708static int dn_rt_cache_seq_show(struct seq_file *seq, void *v)
1709{
1710 struct dn_route *rt = v;
1711 char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN];
1712
1713 seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n",
1714 rt->u.dst.dev ? rt->u.dst.dev->name : "*",
1715 dn_addr2asc(dn_ntohs(rt->rt_daddr), buf1),
1716 dn_addr2asc(dn_ntohs(rt->rt_saddr), buf2),
1717 atomic_read(&rt->u.dst.__refcnt),
1718 rt->u.dst.__use,
1719 (int) dst_metric(&rt->u.dst, RTAX_RTT));
1720 return 0;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001721}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722
Philippe De Muyter56b3d972007-07-10 23:07:31 -07001723static const struct seq_operations dn_rt_cache_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724 .start = dn_rt_cache_seq_start,
1725 .next = dn_rt_cache_seq_next,
1726 .stop = dn_rt_cache_seq_stop,
1727 .show = dn_rt_cache_seq_show,
1728};
1729
1730static int dn_rt_cache_seq_open(struct inode *inode, struct file *file)
1731{
Pavel Emelyanov31164082007-10-10 02:30:23 -07001732 return seq_open_private(file, &dn_rt_cache_seq_ops,
1733 sizeof(struct dn_rt_cache_iter_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734}
1735
Arjan van de Ven9a321442007-02-12 00:55:35 -08001736static const struct file_operations dn_rt_cache_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737 .owner = THIS_MODULE,
1738 .open = dn_rt_cache_seq_open,
1739 .read = seq_read,
1740 .llseek = seq_lseek,
1741 .release = seq_release_private,
1742};
1743
1744#endif /* CONFIG_PROC_FS */
1745
1746void __init dn_route_init(void)
1747{
1748 int i, goal, order;
1749
Alexey Dobriyane5d679f332006-08-26 19:25:52 -07001750 dn_dst_ops.kmem_cachep =
1751 kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0,
Paul Mundt20c2df82007-07-20 10:11:58 +09001752 SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -08001753 setup_timer(&dn_route_timer, dn_dst_check_expire, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
1755 add_timer(&dn_route_timer);
1756
1757 goal = num_physpages >> (26 - PAGE_SHIFT);
1758
1759 for(order = 0; (1UL << order) < goal; order++)
1760 /* NOTHING */;
1761
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001762 /*
1763 * Only want 1024 entries max, since the table is very, very unlikely
1764 * to be larger than that.
1765 */
1766 while(order && ((((1UL << order) * PAGE_SIZE) /
1767 sizeof(struct dn_rt_hash_bucket)) >= 2048))
1768 order--;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001770 do {
1771 dn_rt_hash_mask = (1UL << order) * PAGE_SIZE /
1772 sizeof(struct dn_rt_hash_bucket);
1773 while(dn_rt_hash_mask & (dn_rt_hash_mask - 1))
1774 dn_rt_hash_mask--;
1775 dn_rt_hash_table = (struct dn_rt_hash_bucket *)
1776 __get_free_pages(GFP_ATOMIC, order);
1777 } while (dn_rt_hash_table == NULL && --order > 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778
1779 if (!dn_rt_hash_table)
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001780 panic("Failed to allocate DECnet route cache hash table\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001782 printk(KERN_INFO
1783 "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n",
1784 dn_rt_hash_mask,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785 (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024);
1786
1787 dn_rt_hash_mask--;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001788 for(i = 0; i <= dn_rt_hash_mask; i++) {
1789 spin_lock_init(&dn_rt_hash_table[i].lock);
1790 dn_rt_hash_table[i].chain = NULL;
1791 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001793 dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02001795 proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops);
Thomas Graffa34ddd2007-03-22 11:57:46 -07001796
1797#ifdef CONFIG_DECNET_ROUTER
1798 rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, dn_fib_dump);
1799#else
1800 rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute,
1801 dn_cache_dump);
1802#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803}
1804
1805void __exit dn_route_cleanup(void)
1806{
1807 del_timer(&dn_route_timer);
1808 dn_run_flush(0);
1809
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02001810 proc_net_remove(&init_net, "decnet_cache");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811}
1812