Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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 | |
46 | ||
47 | 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 | ||
58 | #include <linux/config.h> | |
59 | #include <linux/errno.h> | |
60 | #include <linux/types.h> | |
61 | #include <linux/socket.h> | |
62 | #include <linux/in.h> | |
63 | #include <linux/kernel.h> | |
64 | #include <linux/sockios.h> | |
65 | #include <linux/net.h> | |
66 | #include <linux/netdevice.h> | |
67 | #include <linux/inet.h> | |
68 | #include <linux/route.h> | |
69 | #include <linux/in_route.h> | |
70 | #include <net/sock.h> | |
71 | #include <linux/mm.h> | |
72 | #include <linux/proc_fs.h> | |
73 | #include <linux/seq_file.h> | |
74 | #include <linux/init.h> | |
75 | #include <linux/rtnetlink.h> | |
76 | #include <linux/string.h> | |
77 | #include <linux/netfilter_decnet.h> | |
78 | #include <linux/rcupdate.h> | |
79 | #include <linux/times.h> | |
80 | #include <asm/errno.h> | |
81 | #include <net/neighbour.h> | |
82 | #include <net/dst.h> | |
83 | #include <net/flow.h> | |
84 | #include <net/dn.h> | |
85 | #include <net/dn_dev.h> | |
86 | #include <net/dn_nsp.h> | |
87 | #include <net/dn_route.h> | |
88 | #include <net/dn_neigh.h> | |
89 | #include <net/dn_fib.h> | |
90 | ||
91 | struct dn_rt_hash_bucket | |
92 | { | |
93 | struct dn_route *chain; | |
94 | spinlock_t lock; | |
95 | } __attribute__((__aligned__(8))); | |
96 | ||
97 | extern struct neigh_table dn_neigh_table; | |
98 | ||
99 | ||
100 | static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00}; | |
101 | ||
102 | static const int dn_rt_min_delay = 2 * HZ; | |
103 | static const int dn_rt_max_delay = 10 * HZ; | |
104 | static const int dn_rt_mtu_expires = 10 * 60 * HZ; | |
105 | ||
106 | static unsigned long dn_rt_deadline; | |
107 | ||
108 | static int dn_dst_gc(void); | |
109 | static struct dst_entry *dn_dst_check(struct dst_entry *, __u32); | |
110 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *); | |
111 | static void dn_dst_link_failure(struct sk_buff *); | |
112 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu); | |
113 | static int dn_route_input(struct sk_buff *); | |
114 | static void dn_run_flush(unsigned long dummy); | |
115 | ||
116 | static struct dn_rt_hash_bucket *dn_rt_hash_table; | |
117 | static unsigned dn_rt_hash_mask; | |
118 | ||
119 | static struct timer_list dn_route_timer; | |
8d06afab | 120 | static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0); |
1da177e4 LT |
121 | int decnet_dst_gc_interval = 2; |
122 | ||
123 | static struct dst_ops dn_dst_ops = { | |
124 | .family = PF_DECnet, | |
125 | .protocol = __constant_htons(ETH_P_DNA_RT), | |
126 | .gc_thresh = 128, | |
127 | .gc = dn_dst_gc, | |
128 | .check = dn_dst_check, | |
129 | .negative_advice = dn_dst_negative_advice, | |
130 | .link_failure = dn_dst_link_failure, | |
131 | .update_pmtu = dn_dst_update_pmtu, | |
132 | .entry_size = sizeof(struct dn_route), | |
133 | .entries = ATOMIC_INIT(0), | |
134 | }; | |
135 | ||
136 | static __inline__ unsigned dn_hash(unsigned short src, unsigned short dst) | |
137 | { | |
138 | unsigned short tmp = src ^ dst; | |
139 | tmp ^= (tmp >> 3); | |
140 | tmp ^= (tmp >> 5); | |
141 | tmp ^= (tmp >> 10); | |
142 | return dn_rt_hash_mask & (unsigned)tmp; | |
143 | } | |
144 | ||
145 | static inline void dnrt_free(struct dn_route *rt) | |
146 | { | |
147 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); | |
148 | } | |
149 | ||
150 | static inline void dnrt_drop(struct dn_route *rt) | |
151 | { | |
152 | if (rt) | |
153 | dst_release(&rt->u.dst); | |
154 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); | |
155 | } | |
156 | ||
157 | static void dn_dst_check_expire(unsigned long dummy) | |
158 | { | |
159 | int i; | |
160 | struct dn_route *rt, **rtp; | |
161 | unsigned long now = jiffies; | |
162 | unsigned long expire = 120 * HZ; | |
163 | ||
164 | for(i = 0; i <= dn_rt_hash_mask; i++) { | |
165 | rtp = &dn_rt_hash_table[i].chain; | |
166 | ||
167 | spin_lock(&dn_rt_hash_table[i].lock); | |
168 | while((rt=*rtp) != NULL) { | |
169 | if (atomic_read(&rt->u.dst.__refcnt) || | |
170 | (now - rt->u.dst.lastuse) < expire) { | |
171 | rtp = &rt->u.rt_next; | |
172 | continue; | |
173 | } | |
174 | *rtp = rt->u.rt_next; | |
175 | rt->u.rt_next = NULL; | |
176 | dnrt_free(rt); | |
177 | } | |
178 | spin_unlock(&dn_rt_hash_table[i].lock); | |
179 | ||
180 | if ((jiffies - now) > 0) | |
181 | break; | |
182 | } | |
183 | ||
184 | mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ); | |
185 | } | |
186 | ||
187 | static int dn_dst_gc(void) | |
188 | { | |
189 | struct dn_route *rt, **rtp; | |
190 | int i; | |
191 | unsigned long now = jiffies; | |
192 | unsigned long expire = 10 * HZ; | |
193 | ||
194 | for(i = 0; i <= dn_rt_hash_mask; i++) { | |
195 | ||
196 | spin_lock_bh(&dn_rt_hash_table[i].lock); | |
197 | rtp = &dn_rt_hash_table[i].chain; | |
198 | ||
199 | while((rt=*rtp) != NULL) { | |
200 | if (atomic_read(&rt->u.dst.__refcnt) || | |
201 | (now - rt->u.dst.lastuse) < expire) { | |
202 | rtp = &rt->u.rt_next; | |
203 | continue; | |
204 | } | |
205 | *rtp = rt->u.rt_next; | |
206 | rt->u.rt_next = NULL; | |
207 | dnrt_drop(rt); | |
208 | break; | |
209 | } | |
210 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
211 | } | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | /* | |
217 | * The decnet standards don't impose a particular minimum mtu, what they | |
218 | * do insist on is that the routing layer accepts a datagram of at least | |
219 | * 230 bytes long. Here we have to subtract the routing header length from | |
220 | * 230 to get the minimum acceptable mtu. If there is no neighbour, then we | |
221 | * assume the worst and use a long header size. | |
222 | * | |
223 | * We update both the mtu and the advertised mss (i.e. the segment size we | |
224 | * advertise to the other end). | |
225 | */ | |
226 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu) | |
227 | { | |
228 | u32 min_mtu = 230; | |
229 | struct dn_dev *dn = dst->neighbour ? | |
230 | (struct dn_dev *)dst->neighbour->dev->dn_ptr : NULL; | |
231 | ||
232 | if (dn && dn->use_long == 0) | |
233 | min_mtu -= 6; | |
234 | else | |
235 | min_mtu -= 21; | |
236 | ||
237 | if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= min_mtu) { | |
238 | if (!(dst_metric_locked(dst, RTAX_MTU))) { | |
239 | dst->metrics[RTAX_MTU-1] = mtu; | |
240 | dst_set_expires(dst, dn_rt_mtu_expires); | |
241 | } | |
242 | if (!(dst_metric_locked(dst, RTAX_ADVMSS))) { | |
243 | u32 mss = mtu - DN_MAX_NSP_DATA_HEADER; | |
244 | if (dst->metrics[RTAX_ADVMSS-1] > mss) | |
245 | dst->metrics[RTAX_ADVMSS-1] = mss; | |
246 | } | |
247 | } | |
248 | } | |
249 | ||
250 | /* | |
251 | * When a route has been marked obsolete. (e.g. routing cache flush) | |
252 | */ | |
253 | static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie) | |
254 | { | |
255 | return NULL; | |
256 | } | |
257 | ||
258 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst) | |
259 | { | |
260 | dst_release(dst); | |
261 | return NULL; | |
262 | } | |
263 | ||
264 | static void dn_dst_link_failure(struct sk_buff *skb) | |
265 | { | |
266 | return; | |
267 | } | |
268 | ||
269 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) | |
270 | { | |
271 | return memcmp(&fl1->nl_u.dn_u, &fl2->nl_u.dn_u, sizeof(fl1->nl_u.dn_u)) == 0 && | |
272 | fl1->oif == fl2->oif && | |
273 | fl1->iif == fl2->iif; | |
274 | } | |
275 | ||
276 | static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp) | |
277 | { | |
278 | struct dn_route *rth, **rthp; | |
279 | unsigned long now = jiffies; | |
280 | ||
281 | rthp = &dn_rt_hash_table[hash].chain; | |
282 | ||
283 | spin_lock_bh(&dn_rt_hash_table[hash].lock); | |
284 | while((rth = *rthp) != NULL) { | |
285 | if (compare_keys(&rth->fl, &rt->fl)) { | |
286 | /* Put it first */ | |
287 | *rthp = rth->u.rt_next; | |
288 | rcu_assign_pointer(rth->u.rt_next, | |
289 | dn_rt_hash_table[hash].chain); | |
290 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth); | |
291 | ||
292 | rth->u.dst.__use++; | |
293 | dst_hold(&rth->u.dst); | |
294 | rth->u.dst.lastuse = now; | |
295 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); | |
296 | ||
297 | dnrt_drop(rt); | |
298 | *rp = rth; | |
299 | return 0; | |
300 | } | |
301 | rthp = &rth->u.rt_next; | |
302 | } | |
303 | ||
304 | rcu_assign_pointer(rt->u.rt_next, dn_rt_hash_table[hash].chain); | |
305 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt); | |
306 | ||
307 | dst_hold(&rt->u.dst); | |
308 | rt->u.dst.__use++; | |
309 | rt->u.dst.lastuse = now; | |
310 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); | |
311 | *rp = rt; | |
312 | return 0; | |
313 | } | |
314 | ||
315 | void 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) { | |
327 | next = rt->u.rt_next; | |
328 | rt->u.rt_next = NULL; | |
329 | dst_free((struct dst_entry *)rt); | |
330 | } | |
331 | ||
332 | nothing_to_declare: | |
333 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
334 | } | |
335 | } | |
336 | ||
337 | static DEFINE_SPINLOCK(dn_rt_flush_lock); | |
338 | ||
339 | void 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 | */ | |
378 | static int dn_return_short(struct sk_buff *skb) | |
379 | { | |
380 | struct dn_skb_cb *cb; | |
381 | unsigned char *ptr; | |
382 | dn_address *src; | |
383 | dn_address *dst; | |
384 | dn_address tmp; | |
385 | ||
386 | /* Add back headers */ | |
387 | skb_push(skb, skb->data - skb->nh.raw); | |
388 | ||
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 | ||
397 | dst = (dn_address *)ptr; | |
398 | ptr += 2; | |
399 | src = (dn_address *)ptr; | |
400 | 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 | */ | |
418 | static 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 */ | |
426 | skb_push(skb, skb->data - skb->nh.raw); | |
427 | ||
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 | */ | |
465 | static 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", | |
478 | (int)cb->rt_flags, devname, skb->len, cb->src, cb->dst, | |
479 | err, skb->pkt_type); | |
480 | } | |
481 | ||
482 | if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) { | |
483 | switch(cb->rt_flags & DN_RT_PKT_MSK) { | |
484 | case DN_RT_PKT_SHORT: | |
485 | return dn_return_short(skb); | |
486 | case DN_RT_PKT_LONG: | |
487 | return dn_return_long(skb); | |
488 | } | |
489 | } | |
490 | ||
491 | kfree_skb(skb); | |
492 | return NET_RX_DROP; | |
493 | } | |
494 | ||
495 | static int dn_route_rx_long(struct sk_buff *skb) | |
496 | { | |
497 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
498 | unsigned char *ptr = skb->data; | |
499 | ||
500 | if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */ | |
501 | goto drop_it; | |
502 | ||
503 | skb_pull(skb, 20); | |
504 | skb->h.raw = skb->data; | |
505 | ||
506 | /* Destination info */ | |
507 | ptr += 2; | |
508 | cb->dst = dn_htons(dn_eth2dn(ptr)); | |
509 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) | |
510 | goto drop_it; | |
511 | ptr += 6; | |
512 | ||
513 | ||
514 | /* Source info */ | |
515 | ptr += 2; | |
516 | cb->src = dn_htons(dn_eth2dn(ptr)); | |
517 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) | |
518 | goto drop_it; | |
519 | ptr += 6; | |
520 | /* Other junk */ | |
521 | ptr++; | |
522 | cb->hops = *ptr++; /* Visit Count */ | |
523 | ||
524 | return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet); | |
525 | ||
526 | drop_it: | |
527 | kfree_skb(skb); | |
528 | return NET_RX_DROP; | |
529 | } | |
530 | ||
531 | ||
532 | ||
533 | static int dn_route_rx_short(struct sk_buff *skb) | |
534 | { | |
535 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
536 | unsigned char *ptr = skb->data; | |
537 | ||
538 | if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */ | |
539 | goto drop_it; | |
540 | ||
541 | skb_pull(skb, 5); | |
542 | skb->h.raw = skb->data; | |
543 | ||
544 | cb->dst = *(dn_address *)ptr; | |
545 | ptr += 2; | |
546 | cb->src = *(dn_address *)ptr; | |
547 | ptr += 2; | |
548 | cb->hops = *ptr & 0x3f; | |
549 | ||
550 | return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet); | |
551 | ||
552 | drop_it: | |
553 | kfree_skb(skb); | |
554 | return NET_RX_DROP; | |
555 | } | |
556 | ||
557 | static int dn_route_discard(struct sk_buff *skb) | |
558 | { | |
559 | /* | |
560 | * I know we drop the packet here, but thats considered success in | |
561 | * this case | |
562 | */ | |
563 | kfree_skb(skb); | |
564 | return NET_RX_SUCCESS; | |
565 | } | |
566 | ||
567 | static int dn_route_ptp_hello(struct sk_buff *skb) | |
568 | { | |
569 | dn_dev_hello(skb); | |
570 | dn_neigh_pointopoint_hello(skb); | |
571 | return NET_RX_SUCCESS; | |
572 | } | |
573 | ||
f2ccd8fa | 574 | int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
575 | { |
576 | struct dn_skb_cb *cb; | |
577 | unsigned char flags = 0; | |
578 | __u16 len = dn_ntohs(*(__u16 *)skb->data); | |
579 | struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr; | |
580 | unsigned char padlen = 0; | |
581 | ||
582 | if (dn == NULL) | |
583 | goto dump_it; | |
584 | ||
585 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
586 | goto out; | |
587 | ||
588 | if (!pskb_may_pull(skb, 3)) | |
589 | goto dump_it; | |
590 | ||
591 | skb_pull(skb, 2); | |
592 | ||
593 | if (len > skb->len) | |
594 | goto dump_it; | |
595 | ||
596 | skb_trim(skb, len); | |
597 | ||
598 | flags = *skb->data; | |
599 | ||
600 | cb = DN_SKB_CB(skb); | |
601 | cb->stamp = jiffies; | |
602 | cb->iif = dev->ifindex; | |
603 | ||
604 | /* | |
605 | * If we have padding, remove it. | |
606 | */ | |
607 | if (flags & DN_RT_F_PF) { | |
608 | padlen = flags & ~DN_RT_F_PF; | |
609 | if (!pskb_may_pull(skb, padlen + 1)) | |
610 | goto dump_it; | |
611 | skb_pull(skb, padlen); | |
612 | flags = *skb->data; | |
613 | } | |
614 | ||
615 | skb->nh.raw = skb->data; | |
616 | ||
617 | /* | |
618 | * Weed out future version DECnet | |
619 | */ | |
620 | if (flags & DN_RT_F_VER) | |
621 | goto dump_it; | |
622 | ||
623 | cb->rt_flags = flags; | |
624 | ||
625 | if (decnet_debug_level & 1) | |
626 | printk(KERN_DEBUG | |
627 | "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n", | |
628 | (int)flags, (dev) ? dev->name : "???", len, skb->len, | |
629 | padlen); | |
630 | ||
631 | if (flags & DN_RT_PKT_CNTL) { | |
632 | if (unlikely(skb_is_nonlinear(skb)) && | |
633 | skb_linearize(skb, GFP_ATOMIC) != 0) | |
634 | goto dump_it; | |
635 | ||
636 | switch(flags & DN_RT_CNTL_MSK) { | |
637 | case DN_RT_PKT_INIT: | |
638 | dn_dev_init_pkt(skb); | |
639 | break; | |
640 | case DN_RT_PKT_VERI: | |
641 | dn_dev_veri_pkt(skb); | |
642 | break; | |
643 | } | |
644 | ||
645 | if (dn->parms.state != DN_DEV_S_RU) | |
646 | goto dump_it; | |
647 | ||
648 | switch(flags & DN_RT_CNTL_MSK) { | |
649 | case DN_RT_PKT_HELO: | |
650 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_route_ptp_hello); | |
651 | ||
652 | case DN_RT_PKT_L1RT: | |
653 | case DN_RT_PKT_L2RT: | |
654 | return NF_HOOK(PF_DECnet, NF_DN_ROUTE, skb, skb->dev, NULL, dn_route_discard); | |
655 | case DN_RT_PKT_ERTH: | |
656 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_router_hello); | |
657 | ||
658 | case DN_RT_PKT_EEDH: | |
659 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_endnode_hello); | |
660 | } | |
661 | } else { | |
662 | if (dn->parms.state != DN_DEV_S_RU) | |
663 | goto dump_it; | |
664 | ||
665 | skb_pull(skb, 1); /* Pull flags */ | |
666 | ||
667 | switch(flags & DN_RT_PKT_MSK) { | |
668 | case DN_RT_PKT_LONG: | |
669 | return dn_route_rx_long(skb); | |
670 | case DN_RT_PKT_SHORT: | |
671 | return dn_route_rx_short(skb); | |
672 | } | |
673 | } | |
674 | ||
675 | dump_it: | |
676 | kfree_skb(skb); | |
677 | out: | |
678 | return NET_RX_DROP; | |
679 | } | |
680 | ||
681 | static int dn_output(struct sk_buff *skb) | |
682 | { | |
683 | struct dst_entry *dst = skb->dst; | |
684 | struct dn_route *rt = (struct dn_route *)dst; | |
685 | struct net_device *dev = dst->dev; | |
686 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
687 | struct neighbour *neigh; | |
688 | ||
689 | int err = -EINVAL; | |
690 | ||
691 | if ((neigh = dst->neighbour) == NULL) | |
692 | goto error; | |
693 | ||
694 | skb->dev = dev; | |
695 | ||
696 | cb->src = rt->rt_saddr; | |
697 | cb->dst = rt->rt_daddr; | |
698 | ||
699 | /* | |
700 | * Always set the Intra-Ethernet bit on all outgoing packets | |
701 | * originated on this node. Only valid flag from upper layers | |
702 | * is return-to-sender-requested. Set hop count to 0 too. | |
703 | */ | |
704 | cb->rt_flags &= ~DN_RT_F_RQR; | |
705 | cb->rt_flags |= DN_RT_F_IE; | |
706 | cb->hops = 0; | |
707 | ||
708 | return NF_HOOK(PF_DECnet, NF_DN_LOCAL_OUT, skb, NULL, dev, neigh->output); | |
709 | ||
710 | error: | |
711 | if (net_ratelimit()) | |
712 | printk(KERN_DEBUG "dn_output: This should not happen\n"); | |
713 | ||
714 | kfree_skb(skb); | |
715 | ||
716 | return err; | |
717 | } | |
718 | ||
719 | static int dn_forward(struct sk_buff *skb) | |
720 | { | |
721 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
722 | struct dst_entry *dst = skb->dst; | |
723 | struct dn_dev *dn_db = dst->dev->dn_ptr; | |
724 | struct dn_route *rt; | |
725 | struct neighbour *neigh = dst->neighbour; | |
726 | int header_len; | |
727 | #ifdef CONFIG_NETFILTER | |
728 | struct net_device *dev = skb->dev; | |
729 | #endif | |
730 | ||
731 | if (skb->pkt_type != PACKET_HOST) | |
732 | goto drop; | |
733 | ||
734 | /* Ensure that we have enough space for headers */ | |
735 | rt = (struct dn_route *)skb->dst; | |
736 | header_len = dn_db->use_long ? 21 : 6; | |
737 | if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+header_len)) | |
738 | goto drop; | |
739 | ||
740 | /* | |
741 | * Hop count exceeded. | |
742 | */ | |
743 | if (++cb->hops > 30) | |
744 | goto drop; | |
745 | ||
746 | skb->dev = rt->u.dst.dev; | |
747 | ||
748 | /* | |
749 | * If packet goes out same interface it came in on, then set | |
750 | * the Intra-Ethernet bit. This has no effect for short | |
751 | * packets, so we don't need to test for them here. | |
752 | */ | |
753 | cb->rt_flags &= ~DN_RT_F_IE; | |
754 | if (rt->rt_flags & RTCF_DOREDIRECT) | |
755 | cb->rt_flags |= DN_RT_F_IE; | |
756 | ||
757 | return NF_HOOK(PF_DECnet, NF_DN_FORWARD, skb, dev, skb->dev, neigh->output); | |
758 | ||
759 | drop: | |
760 | kfree_skb(skb); | |
761 | return NET_RX_DROP; | |
762 | } | |
763 | ||
764 | /* | |
765 | * Drop packet. This is used for endnodes and for | |
766 | * when we should not be forwarding packets from | |
767 | * this dest. | |
768 | */ | |
769 | static int dn_blackhole(struct sk_buff *skb) | |
770 | { | |
771 | kfree_skb(skb); | |
772 | return NET_RX_DROP; | |
773 | } | |
774 | ||
775 | /* | |
776 | * Used to catch bugs. This should never normally get | |
777 | * called. | |
778 | */ | |
779 | static int dn_rt_bug(struct sk_buff *skb) | |
780 | { | |
781 | if (net_ratelimit()) { | |
782 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
783 | ||
784 | printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n", | |
785 | cb->src, cb->dst); | |
786 | } | |
787 | ||
788 | kfree_skb(skb); | |
789 | ||
790 | return NET_RX_BAD; | |
791 | } | |
792 | ||
793 | static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res) | |
794 | { | |
795 | struct dn_fib_info *fi = res->fi; | |
796 | struct net_device *dev = rt->u.dst.dev; | |
797 | struct neighbour *n; | |
798 | unsigned mss; | |
799 | ||
800 | if (fi) { | |
801 | if (DN_FIB_RES_GW(*res) && | |
802 | DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
803 | rt->rt_gateway = DN_FIB_RES_GW(*res); | |
804 | memcpy(rt->u.dst.metrics, fi->fib_metrics, | |
805 | sizeof(rt->u.dst.metrics)); | |
806 | } | |
807 | rt->rt_type = res->type; | |
808 | ||
809 | if (dev != NULL && rt->u.dst.neighbour == NULL) { | |
810 | n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev); | |
811 | if (IS_ERR(n)) | |
812 | return PTR_ERR(n); | |
813 | rt->u.dst.neighbour = n; | |
814 | } | |
815 | ||
816 | if (rt->u.dst.metrics[RTAX_MTU-1] == 0 || | |
817 | rt->u.dst.metrics[RTAX_MTU-1] > rt->u.dst.dev->mtu) | |
818 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; | |
819 | mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->u.dst)); | |
820 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0 || | |
821 | rt->u.dst.metrics[RTAX_ADVMSS-1] > mss) | |
822 | rt->u.dst.metrics[RTAX_ADVMSS-1] = mss; | |
823 | return 0; | |
824 | } | |
825 | ||
826 | static inline int dn_match_addr(__u16 addr1, __u16 addr2) | |
827 | { | |
828 | __u16 tmp = dn_ntohs(addr1) ^ dn_ntohs(addr2); | |
829 | int match = 16; | |
830 | while(tmp) { | |
831 | tmp >>= 1; | |
832 | match--; | |
833 | } | |
834 | return match; | |
835 | } | |
836 | ||
837 | static __u16 dnet_select_source(const struct net_device *dev, __u16 daddr, int scope) | |
838 | { | |
839 | __u16 saddr = 0; | |
840 | struct dn_dev *dn_db = dev->dn_ptr; | |
841 | struct dn_ifaddr *ifa; | |
842 | int best_match = 0; | |
843 | int ret; | |
844 | ||
845 | read_lock(&dev_base_lock); | |
846 | for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) { | |
847 | if (ifa->ifa_scope > scope) | |
848 | continue; | |
849 | if (!daddr) { | |
850 | saddr = ifa->ifa_local; | |
851 | break; | |
852 | } | |
853 | ret = dn_match_addr(daddr, ifa->ifa_local); | |
854 | if (ret > best_match) | |
855 | saddr = ifa->ifa_local; | |
856 | if (best_match == 0) | |
857 | saddr = ifa->ifa_local; | |
858 | } | |
859 | read_unlock(&dev_base_lock); | |
860 | ||
861 | return saddr; | |
862 | } | |
863 | ||
864 | static inline __u16 __dn_fib_res_prefsrc(struct dn_fib_res *res) | |
865 | { | |
866 | return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope); | |
867 | } | |
868 | ||
869 | static inline __u16 dn_fib_rules_map_destination(__u16 daddr, struct dn_fib_res *res) | |
870 | { | |
871 | __u16 mask = dnet_make_mask(res->prefixlen); | |
872 | return (daddr&~mask)|res->fi->fib_nh->nh_gw; | |
873 | } | |
874 | ||
875 | static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard) | |
876 | { | |
877 | struct flowi fl = { .nl_u = { .dn_u = | |
878 | { .daddr = oldflp->fld_dst, | |
879 | .saddr = oldflp->fld_src, | |
880 | .scope = RT_SCOPE_UNIVERSE, | |
881 | #ifdef CONFIG_DECNET_ROUTE_FWMARK | |
882 | .fwmark = oldflp->fld_fwmark | |
883 | #endif | |
884 | } }, | |
885 | .iif = loopback_dev.ifindex, | |
886 | .oif = oldflp->oif }; | |
887 | struct dn_route *rt = NULL; | |
888 | struct net_device *dev_out = NULL; | |
889 | struct neighbour *neigh = NULL; | |
890 | unsigned hash; | |
891 | unsigned flags = 0; | |
892 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST }; | |
893 | int err; | |
894 | int free_res = 0; | |
895 | __u16 gateway = 0; | |
896 | ||
897 | if (decnet_debug_level & 16) | |
898 | printk(KERN_DEBUG | |
899 | "dn_route_output_slow: dst=%04x src=%04x mark=%d" | |
900 | " iif=%d oif=%d\n", oldflp->fld_dst, oldflp->fld_src, | |
901 | oldflp->fld_fwmark, loopback_dev.ifindex, oldflp->oif); | |
902 | ||
903 | /* If we have an output interface, verify its a DECnet device */ | |
904 | if (oldflp->oif) { | |
905 | dev_out = dev_get_by_index(oldflp->oif); | |
906 | err = -ENODEV; | |
907 | if (dev_out && dev_out->dn_ptr == NULL) { | |
908 | dev_put(dev_out); | |
909 | dev_out = NULL; | |
910 | } | |
911 | if (dev_out == NULL) | |
912 | goto out; | |
913 | } | |
914 | ||
915 | /* If we have a source address, verify that its a local address */ | |
916 | if (oldflp->fld_src) { | |
917 | err = -EADDRNOTAVAIL; | |
918 | ||
919 | if (dev_out) { | |
920 | if (dn_dev_islocal(dev_out, oldflp->fld_src)) | |
921 | goto source_ok; | |
922 | dev_put(dev_out); | |
923 | goto out; | |
924 | } | |
925 | read_lock(&dev_base_lock); | |
926 | for(dev_out = dev_base; dev_out; dev_out = dev_out->next) { | |
927 | if (!dev_out->dn_ptr) | |
928 | continue; | |
929 | if (dn_dev_islocal(dev_out, oldflp->fld_src)) | |
930 | break; | |
931 | } | |
932 | read_unlock(&dev_base_lock); | |
933 | if (dev_out == NULL) | |
934 | goto out; | |
935 | dev_hold(dev_out); | |
936 | source_ok: | |
937 | ; | |
938 | } | |
939 | ||
940 | /* No destination? Assume its local */ | |
941 | if (!fl.fld_dst) { | |
942 | fl.fld_dst = fl.fld_src; | |
943 | ||
944 | err = -EADDRNOTAVAIL; | |
945 | if (dev_out) | |
946 | dev_put(dev_out); | |
947 | dev_out = &loopback_dev; | |
948 | dev_hold(dev_out); | |
949 | if (!fl.fld_dst) { | |
950 | fl.fld_dst = | |
951 | fl.fld_src = dnet_select_source(dev_out, 0, | |
952 | RT_SCOPE_HOST); | |
953 | if (!fl.fld_dst) | |
954 | goto out; | |
955 | } | |
956 | fl.oif = loopback_dev.ifindex; | |
957 | res.type = RTN_LOCAL; | |
958 | goto make_route; | |
959 | } | |
960 | ||
961 | if (decnet_debug_level & 16) | |
962 | printk(KERN_DEBUG | |
963 | "dn_route_output_slow: initial checks complete." | |
964 | " dst=%o4x src=%04x oif=%d try_hard=%d\n", fl.fld_dst, | |
965 | fl.fld_src, fl.oif, try_hard); | |
966 | ||
967 | /* | |
968 | * N.B. If the kernel is compiled without router support then | |
969 | * dn_fib_lookup() will evaluate to non-zero so this if () block | |
970 | * will always be executed. | |
971 | */ | |
972 | err = -ESRCH; | |
973 | if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) { | |
974 | struct dn_dev *dn_db; | |
975 | if (err != -ESRCH) | |
976 | goto out; | |
977 | /* | |
978 | * Here the fallback is basically the standard algorithm for | |
979 | * routing in endnodes which is described in the DECnet routing | |
980 | * docs | |
981 | * | |
982 | * If we are not trying hard, look in neighbour cache. | |
983 | * The result is tested to ensure that if a specific output | |
984 | * device/source address was requested, then we honour that | |
985 | * here | |
986 | */ | |
987 | if (!try_hard) { | |
988 | neigh = neigh_lookup_nodev(&dn_neigh_table, &fl.fld_dst); | |
989 | if (neigh) { | |
990 | if ((oldflp->oif && | |
991 | (neigh->dev->ifindex != oldflp->oif)) || | |
992 | (oldflp->fld_src && | |
993 | (!dn_dev_islocal(neigh->dev, | |
994 | oldflp->fld_src)))) { | |
995 | neigh_release(neigh); | |
996 | neigh = NULL; | |
997 | } else { | |
998 | if (dev_out) | |
999 | dev_put(dev_out); | |
1000 | if (dn_dev_islocal(neigh->dev, fl.fld_dst)) { | |
1001 | dev_out = &loopback_dev; | |
1002 | res.type = RTN_LOCAL; | |
1003 | } else { | |
1004 | dev_out = neigh->dev; | |
1005 | } | |
1006 | dev_hold(dev_out); | |
1007 | goto select_source; | |
1008 | } | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | /* Not there? Perhaps its a local address */ | |
1013 | if (dev_out == NULL) | |
1014 | dev_out = dn_dev_get_default(); | |
1015 | err = -ENODEV; | |
1016 | if (dev_out == NULL) | |
1017 | goto out; | |
1018 | dn_db = dev_out->dn_ptr; | |
1019 | /* Possible improvement - check all devices for local addr */ | |
1020 | if (dn_dev_islocal(dev_out, fl.fld_dst)) { | |
1021 | dev_put(dev_out); | |
1022 | dev_out = &loopback_dev; | |
1023 | dev_hold(dev_out); | |
1024 | res.type = RTN_LOCAL; | |
1025 | goto select_source; | |
1026 | } | |
1027 | /* Not local either.... try sending it to the default router */ | |
1028 | neigh = neigh_clone(dn_db->router); | |
1029 | BUG_ON(neigh && neigh->dev != dev_out); | |
1030 | ||
1031 | /* Ok then, we assume its directly connected and move on */ | |
1032 | select_source: | |
1033 | if (neigh) | |
1034 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1035 | if (gateway == 0) | |
1036 | gateway = fl.fld_dst; | |
1037 | if (fl.fld_src == 0) { | |
1038 | fl.fld_src = dnet_select_source(dev_out, gateway, | |
1039 | res.type == RTN_LOCAL ? | |
1040 | RT_SCOPE_HOST : | |
1041 | RT_SCOPE_LINK); | |
1042 | if (fl.fld_src == 0 && res.type != RTN_LOCAL) | |
1043 | goto e_addr; | |
1044 | } | |
1045 | fl.oif = dev_out->ifindex; | |
1046 | goto make_route; | |
1047 | } | |
1048 | free_res = 1; | |
1049 | ||
1050 | if (res.type == RTN_NAT) | |
1051 | goto e_inval; | |
1052 | ||
1053 | if (res.type == RTN_LOCAL) { | |
1054 | if (!fl.fld_src) | |
1055 | fl.fld_src = fl.fld_dst; | |
1056 | if (dev_out) | |
1057 | dev_put(dev_out); | |
1058 | dev_out = &loopback_dev; | |
1059 | dev_hold(dev_out); | |
1060 | fl.oif = dev_out->ifindex; | |
1061 | if (res.fi) | |
1062 | dn_fib_info_put(res.fi); | |
1063 | res.fi = NULL; | |
1064 | goto make_route; | |
1065 | } | |
1066 | ||
1067 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
1068 | dn_fib_select_multipath(&fl, &res); | |
1069 | ||
1070 | /* | |
1071 | * We could add some logic to deal with default routes here and | |
1072 | * get rid of some of the special casing above. | |
1073 | */ | |
1074 | ||
1075 | if (!fl.fld_src) | |
1076 | fl.fld_src = DN_FIB_RES_PREFSRC(res); | |
1077 | ||
1078 | if (dev_out) | |
1079 | dev_put(dev_out); | |
1080 | dev_out = DN_FIB_RES_DEV(res); | |
1081 | dev_hold(dev_out); | |
1082 | fl.oif = dev_out->ifindex; | |
1083 | gateway = DN_FIB_RES_GW(res); | |
1084 | ||
1085 | make_route: | |
1086 | if (dev_out->flags & IFF_LOOPBACK) | |
1087 | flags |= RTCF_LOCAL; | |
1088 | ||
1089 | rt = dst_alloc(&dn_dst_ops); | |
1090 | if (rt == NULL) | |
1091 | goto e_nobufs; | |
1092 | ||
1093 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1094 | rt->u.dst.flags = DST_HOST; | |
1095 | ||
1096 | rt->fl.fld_src = oldflp->fld_src; | |
1097 | rt->fl.fld_dst = oldflp->fld_dst; | |
1098 | rt->fl.oif = oldflp->oif; | |
1099 | rt->fl.iif = 0; | |
1100 | #ifdef CONFIG_DECNET_ROUTE_FWMARK | |
1101 | rt->fl.fld_fwmark = oldflp->fld_fwmark; | |
1102 | #endif | |
1103 | ||
1104 | rt->rt_saddr = fl.fld_src; | |
1105 | rt->rt_daddr = fl.fld_dst; | |
1106 | rt->rt_gateway = gateway ? gateway : fl.fld_dst; | |
1107 | rt->rt_local_src = fl.fld_src; | |
1108 | ||
1109 | rt->rt_dst_map = fl.fld_dst; | |
1110 | rt->rt_src_map = fl.fld_src; | |
1111 | ||
1112 | rt->u.dst.dev = dev_out; | |
1113 | dev_hold(dev_out); | |
1114 | rt->u.dst.neighbour = neigh; | |
1115 | neigh = NULL; | |
1116 | ||
1117 | rt->u.dst.lastuse = jiffies; | |
1118 | rt->u.dst.output = dn_output; | |
1119 | rt->u.dst.input = dn_rt_bug; | |
1120 | rt->rt_flags = flags; | |
1121 | if (flags & RTCF_LOCAL) | |
1122 | rt->u.dst.input = dn_nsp_rx; | |
1123 | ||
1124 | err = dn_rt_set_next_hop(rt, &res); | |
1125 | if (err) | |
1126 | goto e_neighbour; | |
1127 | ||
1128 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); | |
1129 | dn_insert_route(rt, hash, (struct dn_route **)pprt); | |
1130 | ||
1131 | done: | |
1132 | if (neigh) | |
1133 | neigh_release(neigh); | |
1134 | if (free_res) | |
1135 | dn_fib_res_put(&res); | |
1136 | if (dev_out) | |
1137 | dev_put(dev_out); | |
1138 | out: | |
1139 | return err; | |
1140 | ||
1141 | e_addr: | |
1142 | err = -EADDRNOTAVAIL; | |
1143 | goto done; | |
1144 | e_inval: | |
1145 | err = -EINVAL; | |
1146 | goto done; | |
1147 | e_nobufs: | |
1148 | err = -ENOBUFS; | |
1149 | goto done; | |
1150 | e_neighbour: | |
1151 | dst_free(&rt->u.dst); | |
1152 | goto e_nobufs; | |
1153 | } | |
1154 | ||
1155 | ||
1156 | /* | |
1157 | * N.B. The flags may be moved into the flowi at some future stage. | |
1158 | */ | |
1159 | static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags) | |
1160 | { | |
1161 | unsigned hash = dn_hash(flp->fld_src, flp->fld_dst); | |
1162 | struct dn_route *rt = NULL; | |
1163 | ||
1164 | if (!(flags & MSG_TRYHARD)) { | |
1165 | rcu_read_lock_bh(); | |
1166 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt; | |
1167 | rt = rcu_dereference(rt->u.rt_next)) { | |
1168 | if ((flp->fld_dst == rt->fl.fld_dst) && | |
1169 | (flp->fld_src == rt->fl.fld_src) && | |
1170 | #ifdef CONFIG_DECNET_ROUTE_FWMARK | |
1171 | (flp->fld_fwmark == rt->fl.fld_fwmark) && | |
1172 | #endif | |
1173 | (rt->fl.iif == 0) && | |
1174 | (rt->fl.oif == flp->oif)) { | |
1175 | rt->u.dst.lastuse = jiffies; | |
1176 | dst_hold(&rt->u.dst); | |
1177 | rt->u.dst.__use++; | |
1178 | rcu_read_unlock_bh(); | |
1179 | *pprt = &rt->u.dst; | |
1180 | return 0; | |
1181 | } | |
1182 | } | |
1183 | rcu_read_unlock_bh(); | |
1184 | } | |
1185 | ||
1186 | return dn_route_output_slow(pprt, flp, flags); | |
1187 | } | |
1188 | ||
1189 | static int dn_route_output_key(struct dst_entry **pprt, struct flowi *flp, int flags) | |
1190 | { | |
1191 | int err; | |
1192 | ||
1193 | err = __dn_route_output_key(pprt, flp, flags); | |
1194 | if (err == 0 && flp->proto) { | |
1195 | err = xfrm_lookup(pprt, flp, NULL, 0); | |
1196 | } | |
1197 | return err; | |
1198 | } | |
1199 | ||
1200 | int dn_route_output_sock(struct dst_entry **pprt, struct flowi *fl, struct sock *sk, int flags) | |
1201 | { | |
1202 | int err; | |
1203 | ||
1204 | err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD); | |
1205 | if (err == 0 && fl->proto) { | |
1206 | err = xfrm_lookup(pprt, fl, sk, !(flags & MSG_DONTWAIT)); | |
1207 | } | |
1208 | return err; | |
1209 | } | |
1210 | ||
1211 | static int dn_route_input_slow(struct sk_buff *skb) | |
1212 | { | |
1213 | struct dn_route *rt = NULL; | |
1214 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1215 | struct net_device *in_dev = skb->dev; | |
1216 | struct net_device *out_dev = NULL; | |
1217 | struct dn_dev *dn_db; | |
1218 | struct neighbour *neigh = NULL; | |
1219 | unsigned hash; | |
1220 | int flags = 0; | |
1221 | __u16 gateway = 0; | |
1222 | __u16 local_src = 0; | |
1223 | struct flowi fl = { .nl_u = { .dn_u = | |
1224 | { .daddr = cb->dst, | |
1225 | .saddr = cb->src, | |
1226 | .scope = RT_SCOPE_UNIVERSE, | |
1227 | #ifdef CONFIG_DECNET_ROUTE_FWMARK | |
1228 | .fwmark = skb->nfmark | |
1229 | #endif | |
1230 | } }, | |
1231 | .iif = skb->dev->ifindex }; | |
1232 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE }; | |
1233 | int err = -EINVAL; | |
1234 | int free_res = 0; | |
1235 | ||
1236 | dev_hold(in_dev); | |
1237 | ||
1238 | if ((dn_db = in_dev->dn_ptr) == NULL) | |
1239 | goto out; | |
1240 | ||
1241 | /* Zero source addresses are not allowed */ | |
1242 | if (fl.fld_src == 0) | |
1243 | goto out; | |
1244 | ||
1245 | /* | |
1246 | * In this case we've just received a packet from a source | |
1247 | * outside ourselves pretending to come from us. We don't | |
1248 | * allow it any further to prevent routing loops, spoofing and | |
1249 | * other nasties. Loopback packets already have the dst attached | |
1250 | * so this only affects packets which have originated elsewhere. | |
1251 | */ | |
1252 | err = -ENOTUNIQ; | |
1253 | if (dn_dev_islocal(in_dev, cb->src)) | |
1254 | goto out; | |
1255 | ||
1256 | err = dn_fib_lookup(&fl, &res); | |
1257 | if (err) { | |
1258 | if (err != -ESRCH) | |
1259 | goto out; | |
1260 | /* | |
1261 | * Is the destination us ? | |
1262 | */ | |
1263 | if (!dn_dev_islocal(in_dev, cb->dst)) | |
1264 | goto e_inval; | |
1265 | ||
1266 | res.type = RTN_LOCAL; | |
1267 | flags |= RTCF_DIRECTSRC; | |
1268 | } else { | |
1269 | __u16 src_map = fl.fld_src; | |
1270 | free_res = 1; | |
1271 | ||
1272 | out_dev = DN_FIB_RES_DEV(res); | |
1273 | if (out_dev == NULL) { | |
1274 | if (net_ratelimit()) | |
1275 | printk(KERN_CRIT "Bug in dn_route_input_slow() " | |
1276 | "No output device\n"); | |
1277 | goto e_inval; | |
1278 | } | |
1279 | dev_hold(out_dev); | |
1280 | ||
1281 | if (res.r) | |
1282 | src_map = dn_fib_rules_policy(fl.fld_src, &res, &flags); | |
1283 | ||
1284 | gateway = DN_FIB_RES_GW(res); | |
1285 | if (res.type == RTN_NAT) { | |
1286 | fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res); | |
1287 | dn_fib_res_put(&res); | |
1288 | free_res = 0; | |
1289 | if (dn_fib_lookup(&fl, &res)) | |
1290 | goto e_inval; | |
1291 | free_res = 1; | |
1292 | if (res.type != RTN_UNICAST) | |
1293 | goto e_inval; | |
1294 | flags |= RTCF_DNAT; | |
1295 | gateway = fl.fld_dst; | |
1296 | } | |
1297 | fl.fld_src = src_map; | |
1298 | } | |
1299 | ||
1300 | switch(res.type) { | |
1301 | case RTN_UNICAST: | |
1302 | /* | |
1303 | * Forwarding check here, we only check for forwarding | |
1304 | * being turned off, if you want to only forward intra | |
1305 | * area, its up to you to set the routing tables up | |
1306 | * correctly. | |
1307 | */ | |
1308 | if (dn_db->parms.forwarding == 0) | |
1309 | goto e_inval; | |
1310 | ||
1311 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
1312 | dn_fib_select_multipath(&fl, &res); | |
1313 | ||
1314 | /* | |
1315 | * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT | |
1316 | * flag as a hint to set the intra-ethernet bit when | |
1317 | * forwarding. If we've got NAT in operation, we don't do | |
1318 | * this optimisation. | |
1319 | */ | |
1320 | if (out_dev == in_dev && !(flags & RTCF_NAT)) | |
1321 | flags |= RTCF_DOREDIRECT; | |
1322 | ||
1323 | local_src = DN_FIB_RES_PREFSRC(res); | |
1324 | ||
1325 | case RTN_BLACKHOLE: | |
1326 | case RTN_UNREACHABLE: | |
1327 | break; | |
1328 | case RTN_LOCAL: | |
1329 | flags |= RTCF_LOCAL; | |
1330 | fl.fld_src = cb->dst; | |
1331 | fl.fld_dst = cb->src; | |
1332 | ||
1333 | /* Routing tables gave us a gateway */ | |
1334 | if (gateway) | |
1335 | goto make_route; | |
1336 | ||
1337 | /* Packet was intra-ethernet, so we know its on-link */ | |
1338 | if (cb->rt_flags | DN_RT_F_IE) { | |
1339 | gateway = cb->src; | |
1340 | flags |= RTCF_DIRECTSRC; | |
1341 | goto make_route; | |
1342 | } | |
1343 | ||
1344 | /* Use the default router if there is one */ | |
1345 | neigh = neigh_clone(dn_db->router); | |
1346 | if (neigh) { | |
1347 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1348 | goto make_route; | |
1349 | } | |
1350 | ||
1351 | /* Close eyes and pray */ | |
1352 | gateway = cb->src; | |
1353 | flags |= RTCF_DIRECTSRC; | |
1354 | goto make_route; | |
1355 | default: | |
1356 | goto e_inval; | |
1357 | } | |
1358 | ||
1359 | make_route: | |
1360 | rt = dst_alloc(&dn_dst_ops); | |
1361 | if (rt == NULL) | |
1362 | goto e_nobufs; | |
1363 | ||
1364 | rt->rt_saddr = fl.fld_src; | |
1365 | rt->rt_daddr = fl.fld_dst; | |
1366 | rt->rt_gateway = fl.fld_dst; | |
1367 | if (gateway) | |
1368 | rt->rt_gateway = gateway; | |
1369 | rt->rt_local_src = local_src ? local_src : rt->rt_saddr; | |
1370 | ||
1371 | rt->rt_dst_map = fl.fld_dst; | |
1372 | rt->rt_src_map = fl.fld_src; | |
1373 | ||
1374 | rt->fl.fld_src = cb->src; | |
1375 | rt->fl.fld_dst = cb->dst; | |
1376 | rt->fl.oif = 0; | |
1377 | rt->fl.iif = in_dev->ifindex; | |
1378 | rt->fl.fld_fwmark = fl.fld_fwmark; | |
1379 | ||
1380 | rt->u.dst.flags = DST_HOST; | |
1381 | rt->u.dst.neighbour = neigh; | |
1382 | rt->u.dst.dev = out_dev; | |
1383 | rt->u.dst.lastuse = jiffies; | |
1384 | rt->u.dst.output = dn_rt_bug; | |
1385 | switch(res.type) { | |
1386 | case RTN_UNICAST: | |
1387 | rt->u.dst.input = dn_forward; | |
1388 | break; | |
1389 | case RTN_LOCAL: | |
1390 | rt->u.dst.output = dn_output; | |
1391 | rt->u.dst.input = dn_nsp_rx; | |
1392 | rt->u.dst.dev = in_dev; | |
1393 | flags |= RTCF_LOCAL; | |
1394 | break; | |
1395 | default: | |
1396 | case RTN_UNREACHABLE: | |
1397 | case RTN_BLACKHOLE: | |
1398 | rt->u.dst.input = dn_blackhole; | |
1399 | } | |
1400 | rt->rt_flags = flags; | |
1401 | if (rt->u.dst.dev) | |
1402 | dev_hold(rt->u.dst.dev); | |
1403 | ||
1404 | err = dn_rt_set_next_hop(rt, &res); | |
1405 | if (err) | |
1406 | goto e_neighbour; | |
1407 | ||
1408 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); | |
1409 | dn_insert_route(rt, hash, (struct dn_route **)&skb->dst); | |
1410 | ||
1411 | done: | |
1412 | if (neigh) | |
1413 | neigh_release(neigh); | |
1414 | if (free_res) | |
1415 | dn_fib_res_put(&res); | |
1416 | dev_put(in_dev); | |
1417 | if (out_dev) | |
1418 | dev_put(out_dev); | |
1419 | out: | |
1420 | return err; | |
1421 | ||
1422 | e_inval: | |
1423 | err = -EINVAL; | |
1424 | goto done; | |
1425 | ||
1426 | e_nobufs: | |
1427 | err = -ENOBUFS; | |
1428 | goto done; | |
1429 | ||
1430 | e_neighbour: | |
1431 | dst_free(&rt->u.dst); | |
1432 | goto done; | |
1433 | } | |
1434 | ||
1435 | int dn_route_input(struct sk_buff *skb) | |
1436 | { | |
1437 | struct dn_route *rt; | |
1438 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1439 | unsigned hash = dn_hash(cb->src, cb->dst); | |
1440 | ||
1441 | if (skb->dst) | |
1442 | return 0; | |
1443 | ||
1444 | rcu_read_lock(); | |
1445 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL; | |
1446 | rt = rcu_dereference(rt->u.rt_next)) { | |
1447 | if ((rt->fl.fld_src == cb->src) && | |
1448 | (rt->fl.fld_dst == cb->dst) && | |
1449 | (rt->fl.oif == 0) && | |
1450 | #ifdef CONFIG_DECNET_ROUTE_FWMARK | |
1451 | (rt->fl.fld_fwmark == skb->nfmark) && | |
1452 | #endif | |
1453 | (rt->fl.iif == cb->iif)) { | |
1454 | rt->u.dst.lastuse = jiffies; | |
1455 | dst_hold(&rt->u.dst); | |
1456 | rt->u.dst.__use++; | |
1457 | rcu_read_unlock(); | |
1458 | skb->dst = (struct dst_entry *)rt; | |
1459 | return 0; | |
1460 | } | |
1461 | } | |
1462 | rcu_read_unlock(); | |
1463 | ||
1464 | return dn_route_input_slow(skb); | |
1465 | } | |
1466 | ||
b6544c0b JHS |
1467 | static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
1468 | int event, int nowait, unsigned int flags) | |
1da177e4 LT |
1469 | { |
1470 | struct dn_route *rt = (struct dn_route *)skb->dst; | |
1471 | struct rtmsg *r; | |
1472 | struct nlmsghdr *nlh; | |
1473 | unsigned char *b = skb->tail; | |
1474 | struct rta_cacheinfo ci; | |
1475 | ||
b6544c0b | 1476 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); |
1da177e4 | 1477 | r = NLMSG_DATA(nlh); |
1da177e4 LT |
1478 | r->rtm_family = AF_DECnet; |
1479 | r->rtm_dst_len = 16; | |
1480 | r->rtm_src_len = 0; | |
1481 | r->rtm_tos = 0; | |
1482 | r->rtm_table = RT_TABLE_MAIN; | |
1483 | r->rtm_type = rt->rt_type; | |
1484 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
1485 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
1486 | r->rtm_protocol = RTPROT_UNSPEC; | |
1487 | if (rt->rt_flags & RTCF_NOTIFY) | |
1488 | r->rtm_flags |= RTM_F_NOTIFY; | |
1489 | RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr); | |
1490 | if (rt->fl.fld_src) { | |
1491 | r->rtm_src_len = 16; | |
1492 | RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src); | |
1493 | } | |
1494 | if (rt->u.dst.dev) | |
1495 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex); | |
1496 | /* | |
1497 | * Note to self - change this if input routes reverse direction when | |
1498 | * they deal only with inputs and not with replies like they do | |
1499 | * currently. | |
1500 | */ | |
1501 | RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src); | |
1502 | if (rt->rt_daddr != rt->rt_gateway) | |
1503 | RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway); | |
1504 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) | |
1505 | goto rtattr_failure; | |
1506 | ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse); | |
1507 | ci.rta_used = rt->u.dst.__use; | |
1508 | ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt); | |
1509 | if (rt->u.dst.expires) | |
1510 | ci.rta_expires = jiffies_to_clock_t(rt->u.dst.expires - jiffies); | |
1511 | else | |
1512 | ci.rta_expires = 0; | |
1513 | ci.rta_error = rt->u.dst.error; | |
1514 | ci.rta_id = ci.rta_ts = ci.rta_tsage = 0; | |
1515 | RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci); | |
1516 | if (rt->fl.iif) | |
1517 | RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif); | |
1518 | ||
1519 | nlh->nlmsg_len = skb->tail - b; | |
1520 | return skb->len; | |
1521 | ||
1522 | nlmsg_failure: | |
1523 | rtattr_failure: | |
1524 | skb_trim(skb, b - skb->data); | |
1525 | return -1; | |
1526 | } | |
1527 | ||
1528 | /* | |
1529 | * This is called by both endnodes and routers now. | |
1530 | */ | |
1531 | int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg) | |
1532 | { | |
1533 | struct rtattr **rta = arg; | |
1534 | struct rtmsg *rtm = NLMSG_DATA(nlh); | |
1535 | struct dn_route *rt = NULL; | |
1536 | struct dn_skb_cb *cb; | |
1537 | int err; | |
1538 | struct sk_buff *skb; | |
1539 | struct flowi fl; | |
1540 | ||
1541 | memset(&fl, 0, sizeof(fl)); | |
1542 | fl.proto = DNPROTO_NSP; | |
1543 | ||
1544 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1545 | if (skb == NULL) | |
1546 | return -ENOBUFS; | |
1547 | skb->mac.raw = skb->data; | |
1548 | cb = DN_SKB_CB(skb); | |
1549 | ||
1550 | if (rta[RTA_SRC-1]) | |
1551 | memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2); | |
1552 | if (rta[RTA_DST-1]) | |
1553 | memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2); | |
1554 | if (rta[RTA_IIF-1]) | |
1555 | memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); | |
1556 | ||
1557 | if (fl.iif) { | |
1558 | struct net_device *dev; | |
1559 | if ((dev = dev_get_by_index(fl.iif)) == NULL) { | |
1560 | kfree_skb(skb); | |
1561 | return -ENODEV; | |
1562 | } | |
1563 | if (!dev->dn_ptr) { | |
1564 | dev_put(dev); | |
1565 | kfree_skb(skb); | |
1566 | return -ENODEV; | |
1567 | } | |
1568 | skb->protocol = __constant_htons(ETH_P_DNA_RT); | |
1569 | skb->dev = dev; | |
1570 | cb->src = fl.fld_src; | |
1571 | cb->dst = fl.fld_dst; | |
1572 | local_bh_disable(); | |
1573 | err = dn_route_input(skb); | |
1574 | local_bh_enable(); | |
1575 | memset(cb, 0, sizeof(struct dn_skb_cb)); | |
1576 | rt = (struct dn_route *)skb->dst; | |
1577 | if (!err && -rt->u.dst.error) | |
1578 | err = rt->u.dst.error; | |
1579 | } else { | |
1580 | int oif = 0; | |
1581 | if (rta[RTA_OIF - 1]) | |
1582 | memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int)); | |
1583 | fl.oif = oif; | |
1584 | err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0); | |
1585 | } | |
1586 | ||
1587 | if (skb->dev) | |
1588 | dev_put(skb->dev); | |
1589 | skb->dev = NULL; | |
1590 | if (err) | |
1591 | goto out_free; | |
1592 | skb->dst = &rt->u.dst; | |
1593 | if (rtm->rtm_flags & RTM_F_NOTIFY) | |
1594 | rt->rt_flags |= RTCF_NOTIFY; | |
1595 | ||
1596 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; | |
1597 | ||
b6544c0b | 1598 | err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0); |
1da177e4 LT |
1599 | |
1600 | if (err == 0) | |
1601 | goto out_free; | |
1602 | if (err < 0) { | |
1603 | err = -EMSGSIZE; | |
1604 | goto out_free; | |
1605 | } | |
1606 | ||
1607 | err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); | |
1608 | ||
1609 | return err; | |
1610 | ||
1611 | out_free: | |
1612 | kfree_skb(skb); | |
1613 | return err; | |
1614 | } | |
1615 | ||
1616 | /* | |
1617 | * For routers, this is called from dn_fib_dump, but for endnodes its | |
1618 | * called directly from the rtnetlink dispatch table. | |
1619 | */ | |
1620 | int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1621 | { | |
1622 | struct dn_route *rt; | |
1623 | int h, s_h; | |
1624 | int idx, s_idx; | |
1625 | ||
1626 | if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg)) | |
1627 | return -EINVAL; | |
1628 | if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)) | |
1629 | return 0; | |
1630 | ||
1631 | s_h = cb->args[0]; | |
1632 | s_idx = idx = cb->args[1]; | |
1633 | for(h = 0; h <= dn_rt_hash_mask; h++) { | |
1634 | if (h < s_h) | |
1635 | continue; | |
1636 | if (h > s_h) | |
1637 | s_idx = 0; | |
1638 | rcu_read_lock_bh(); | |
1639 | for(rt = rcu_dereference(dn_rt_hash_table[h].chain), idx = 0; | |
1640 | rt; | |
1641 | rt = rcu_dereference(rt->u.rt_next), idx++) { | |
1642 | if (idx < s_idx) | |
1643 | continue; | |
1644 | skb->dst = dst_clone(&rt->u.dst); | |
1645 | if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
b6544c0b JHS |
1646 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
1647 | 1, NLM_F_MULTI) <= 0) { | |
1da177e4 LT |
1648 | dst_release(xchg(&skb->dst, NULL)); |
1649 | rcu_read_unlock_bh(); | |
1650 | goto done; | |
1651 | } | |
1652 | dst_release(xchg(&skb->dst, NULL)); | |
1653 | } | |
1654 | rcu_read_unlock_bh(); | |
1655 | } | |
1656 | ||
1657 | done: | |
1658 | cb->args[0] = h; | |
1659 | cb->args[1] = idx; | |
1660 | return skb->len; | |
1661 | } | |
1662 | ||
1663 | #ifdef CONFIG_PROC_FS | |
1664 | struct dn_rt_cache_iter_state { | |
1665 | int bucket; | |
1666 | }; | |
1667 | ||
1668 | static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq) | |
1669 | { | |
1670 | struct dn_route *rt = NULL; | |
1671 | struct dn_rt_cache_iter_state *s = seq->private; | |
1672 | ||
1673 | for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) { | |
1674 | rcu_read_lock_bh(); | |
1675 | rt = dn_rt_hash_table[s->bucket].chain; | |
1676 | if (rt) | |
1677 | break; | |
1678 | rcu_read_unlock_bh(); | |
1679 | } | |
1680 | return rt; | |
1681 | } | |
1682 | ||
1683 | static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt) | |
1684 | { | |
1685 | struct dn_rt_cache_iter_state *s = rcu_dereference(seq->private); | |
1686 | ||
1687 | rt = rt->u.rt_next; | |
1688 | while(!rt) { | |
1689 | rcu_read_unlock_bh(); | |
1690 | if (--s->bucket < 0) | |
1691 | break; | |
1692 | rcu_read_lock_bh(); | |
1693 | rt = dn_rt_hash_table[s->bucket].chain; | |
1694 | } | |
1695 | return rt; | |
1696 | } | |
1697 | ||
1698 | static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
1699 | { | |
1700 | struct dn_route *rt = dn_rt_cache_get_first(seq); | |
1701 | ||
1702 | if (rt) { | |
1703 | while(*pos && (rt = dn_rt_cache_get_next(seq, rt))) | |
1704 | --*pos; | |
1705 | } | |
1706 | return *pos ? NULL : rt; | |
1707 | } | |
1708 | ||
1709 | static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1710 | { | |
1711 | struct dn_route *rt = dn_rt_cache_get_next(seq, v); | |
1712 | ++*pos; | |
1713 | return rt; | |
1714 | } | |
1715 | ||
1716 | static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v) | |
1717 | { | |
1718 | if (v) | |
1719 | rcu_read_unlock_bh(); | |
1720 | } | |
1721 | ||
1722 | static int dn_rt_cache_seq_show(struct seq_file *seq, void *v) | |
1723 | { | |
1724 | struct dn_route *rt = v; | |
1725 | char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN]; | |
1726 | ||
1727 | seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n", | |
1728 | rt->u.dst.dev ? rt->u.dst.dev->name : "*", | |
1729 | dn_addr2asc(dn_ntohs(rt->rt_daddr), buf1), | |
1730 | dn_addr2asc(dn_ntohs(rt->rt_saddr), buf2), | |
1731 | atomic_read(&rt->u.dst.__refcnt), | |
1732 | rt->u.dst.__use, | |
1733 | (int) dst_metric(&rt->u.dst, RTAX_RTT)); | |
1734 | return 0; | |
1735 | } | |
1736 | ||
1737 | static struct seq_operations dn_rt_cache_seq_ops = { | |
1738 | .start = dn_rt_cache_seq_start, | |
1739 | .next = dn_rt_cache_seq_next, | |
1740 | .stop = dn_rt_cache_seq_stop, | |
1741 | .show = dn_rt_cache_seq_show, | |
1742 | }; | |
1743 | ||
1744 | static int dn_rt_cache_seq_open(struct inode *inode, struct file *file) | |
1745 | { | |
1746 | struct seq_file *seq; | |
1747 | int rc = -ENOMEM; | |
1748 | struct dn_rt_cache_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1749 | ||
1750 | if (!s) | |
1751 | goto out; | |
1752 | rc = seq_open(file, &dn_rt_cache_seq_ops); | |
1753 | if (rc) | |
1754 | goto out_kfree; | |
1755 | seq = file->private_data; | |
1756 | seq->private = s; | |
1757 | memset(s, 0, sizeof(*s)); | |
1758 | out: | |
1759 | return rc; | |
1760 | out_kfree: | |
1761 | kfree(s); | |
1762 | goto out; | |
1763 | } | |
1764 | ||
1765 | static struct file_operations dn_rt_cache_seq_fops = { | |
1766 | .owner = THIS_MODULE, | |
1767 | .open = dn_rt_cache_seq_open, | |
1768 | .read = seq_read, | |
1769 | .llseek = seq_lseek, | |
1770 | .release = seq_release_private, | |
1771 | }; | |
1772 | ||
1773 | #endif /* CONFIG_PROC_FS */ | |
1774 | ||
1775 | void __init dn_route_init(void) | |
1776 | { | |
1777 | int i, goal, order; | |
1778 | ||
1779 | dn_dst_ops.kmem_cachep = kmem_cache_create("dn_dst_cache", | |
1780 | sizeof(struct dn_route), | |
1781 | 0, SLAB_HWCACHE_ALIGN, | |
1782 | NULL, NULL); | |
1783 | ||
1784 | if (!dn_dst_ops.kmem_cachep) | |
1785 | panic("DECnet: Failed to allocate dn_dst_cache\n"); | |
1786 | ||
1787 | init_timer(&dn_route_timer); | |
1788 | dn_route_timer.function = dn_dst_check_expire; | |
1789 | dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; | |
1790 | add_timer(&dn_route_timer); | |
1791 | ||
1792 | goal = num_physpages >> (26 - PAGE_SHIFT); | |
1793 | ||
1794 | for(order = 0; (1UL << order) < goal; order++) | |
1795 | /* NOTHING */; | |
1796 | ||
1797 | /* | |
1798 | * Only want 1024 entries max, since the table is very, very unlikely | |
1799 | * to be larger than that. | |
1800 | */ | |
1801 | while(order && ((((1UL << order) * PAGE_SIZE) / | |
1802 | sizeof(struct dn_rt_hash_bucket)) >= 2048)) | |
1803 | order--; | |
1804 | ||
1805 | do { | |
1806 | dn_rt_hash_mask = (1UL << order) * PAGE_SIZE / | |
1807 | sizeof(struct dn_rt_hash_bucket); | |
1808 | while(dn_rt_hash_mask & (dn_rt_hash_mask - 1)) | |
1809 | dn_rt_hash_mask--; | |
1810 | dn_rt_hash_table = (struct dn_rt_hash_bucket *) | |
1811 | __get_free_pages(GFP_ATOMIC, order); | |
1812 | } while (dn_rt_hash_table == NULL && --order > 0); | |
1813 | ||
1814 | if (!dn_rt_hash_table) | |
1815 | panic("Failed to allocate DECnet route cache hash table\n"); | |
1816 | ||
1817 | printk(KERN_INFO | |
1818 | "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n", | |
1819 | dn_rt_hash_mask, | |
1820 | (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024); | |
1821 | ||
1822 | dn_rt_hash_mask--; | |
1823 | for(i = 0; i <= dn_rt_hash_mask; i++) { | |
1824 | spin_lock_init(&dn_rt_hash_table[i].lock); | |
1825 | dn_rt_hash_table[i].chain = NULL; | |
1826 | } | |
1827 | ||
1828 | dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1); | |
1829 | ||
1830 | proc_net_fops_create("decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops); | |
1831 | } | |
1832 | ||
1833 | void __exit dn_route_cleanup(void) | |
1834 | { | |
1835 | del_timer(&dn_route_timer); | |
1836 | dn_run_flush(0); | |
1837 | ||
1838 | proc_net_remove("decnet_cache"); | |
1839 | } | |
1840 |