Root/
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/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 <linux/slab.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/net_namespace.h> |
82 | #include <net/netlink.h> |
83 | #include <net/neighbour.h> |
84 | #include <net/dst.h> |
85 | #include <net/flow.h> |
86 | #include <net/fib_rules.h> |
87 | #include <net/dn.h> |
88 | #include <net/dn_dev.h> |
89 | #include <net/dn_nsp.h> |
90 | #include <net/dn_route.h> |
91 | #include <net/dn_neigh.h> |
92 | #include <net/dn_fib.h> |
93 | |
94 | struct dn_rt_hash_bucket |
95 | { |
96 | struct dn_route *chain; |
97 | spinlock_t lock; |
98 | }; |
99 | |
100 | extern struct neigh_table dn_neigh_table; |
101 | |
102 | |
103 | static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00}; |
104 | |
105 | static const int dn_rt_min_delay = 2 * HZ; |
106 | static const int dn_rt_max_delay = 10 * HZ; |
107 | static const int dn_rt_mtu_expires = 10 * 60 * HZ; |
108 | |
109 | static unsigned long dn_rt_deadline; |
110 | |
111 | static int dn_dst_gc(struct dst_ops *ops); |
112 | static struct dst_entry *dn_dst_check(struct dst_entry *, __u32); |
113 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *); |
114 | static void dn_dst_link_failure(struct sk_buff *); |
115 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu); |
116 | static int dn_route_input(struct sk_buff *); |
117 | static void dn_run_flush(unsigned long dummy); |
118 | |
119 | static struct dn_rt_hash_bucket *dn_rt_hash_table; |
120 | static unsigned dn_rt_hash_mask; |
121 | |
122 | static struct timer_list dn_route_timer; |
123 | static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0); |
124 | int decnet_dst_gc_interval = 2; |
125 | |
126 | static struct dst_ops dn_dst_ops = { |
127 | .family = PF_DECnet, |
128 | .protocol = cpu_to_be16(ETH_P_DNA_RT), |
129 | .gc_thresh = 128, |
130 | .gc = dn_dst_gc, |
131 | .check = dn_dst_check, |
132 | .negative_advice = dn_dst_negative_advice, |
133 | .link_failure = dn_dst_link_failure, |
134 | .update_pmtu = dn_dst_update_pmtu, |
135 | .entries = ATOMIC_INIT(0), |
136 | }; |
137 | |
138 | static __inline__ unsigned dn_hash(__le16 src, __le16 dst) |
139 | { |
140 | __u16 tmp = (__u16 __force)(src ^ dst); |
141 | tmp ^= (tmp >> 3); |
142 | tmp ^= (tmp >> 5); |
143 | tmp ^= (tmp >> 10); |
144 | return dn_rt_hash_mask & (unsigned)tmp; |
145 | } |
146 | |
147 | static inline void dnrt_free(struct dn_route *rt) |
148 | { |
149 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); |
150 | } |
151 | |
152 | static inline void dnrt_drop(struct dn_route *rt) |
153 | { |
154 | dst_release(&rt->dst); |
155 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); |
156 | } |
157 | |
158 | static 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->dst.__refcnt) || |
171 | (now - rt->dst.lastuse) < expire) { |
172 | rtp = &rt->dst.dn_next; |
173 | continue; |
174 | } |
175 | *rtp = rt->dst.dn_next; |
176 | rt->dst.dn_next = NULL; |
177 | 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 | |
188 | static int dn_dst_gc(struct dst_ops *ops) |
189 | { |
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->dst.__refcnt) || |
202 | (now - rt->dst.lastuse) < expire) { |
203 | rtp = &rt->dst.dn_next; |
204 | continue; |
205 | } |
206 | *rtp = rt->dst.dn_next; |
207 | rt->dst.dn_next = NULL; |
208 | 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 | */ |
227 | static 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_metric(dst, RTAX_MTU) > 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_metric(dst, RTAX_ADVMSS) > mss) |
246 | dst->metrics[RTAX_ADVMSS-1] = mss; |
247 | } |
248 | } |
249 | } |
250 | |
251 | /* |
252 | * When a route has been marked obsolete. (e.g. routing cache flush) |
253 | */ |
254 | static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie) |
255 | { |
256 | return NULL; |
257 | } |
258 | |
259 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst) |
260 | { |
261 | dst_release(dst); |
262 | return NULL; |
263 | } |
264 | |
265 | static void dn_dst_link_failure(struct sk_buff *skb) |
266 | { |
267 | } |
268 | |
269 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) |
270 | { |
271 | return ((fl1->nl_u.dn_u.daddr ^ fl2->nl_u.dn_u.daddr) | |
272 | (fl1->nl_u.dn_u.saddr ^ fl2->nl_u.dn_u.saddr) | |
273 | (fl1->mark ^ fl2->mark) | |
274 | (fl1->nl_u.dn_u.scope ^ fl2->nl_u.dn_u.scope) | |
275 | (fl1->oif ^ fl2->oif) | |
276 | (fl1->iif ^ fl2->iif)) == 0; |
277 | } |
278 | |
279 | static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp) |
280 | { |
281 | struct dn_route *rth, **rthp; |
282 | unsigned long now = jiffies; |
283 | |
284 | rthp = &dn_rt_hash_table[hash].chain; |
285 | |
286 | spin_lock_bh(&dn_rt_hash_table[hash].lock); |
287 | while((rth = *rthp) != NULL) { |
288 | if (compare_keys(&rth->fl, &rt->fl)) { |
289 | /* Put it first */ |
290 | *rthp = rth->dst.dn_next; |
291 | rcu_assign_pointer(rth->dst.dn_next, |
292 | dn_rt_hash_table[hash].chain); |
293 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth); |
294 | |
295 | dst_use(&rth->dst, now); |
296 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
297 | |
298 | dnrt_drop(rt); |
299 | *rp = rth; |
300 | return 0; |
301 | } |
302 | rthp = &rth->dst.dn_next; |
303 | } |
304 | |
305 | rcu_assign_pointer(rt->dst.dn_next, dn_rt_hash_table[hash].chain); |
306 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt); |
307 | |
308 | dst_use(&rt->dst, now); |
309 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
310 | *rp = rt; |
311 | return 0; |
312 | } |
313 | |
314 | static void dn_run_flush(unsigned long dummy) |
315 | { |
316 | int i; |
317 | struct dn_route *rt, *next; |
318 | |
319 | for(i = 0; i < dn_rt_hash_mask; i++) { |
320 | spin_lock_bh(&dn_rt_hash_table[i].lock); |
321 | |
322 | if ((rt = xchg(&dn_rt_hash_table[i].chain, NULL)) == NULL) |
323 | goto nothing_to_declare; |
324 | |
325 | for(; rt; rt=next) { |
326 | next = rt->dst.dn_next; |
327 | rt->dst.dn_next = NULL; |
328 | dst_free((struct dst_entry *)rt); |
329 | } |
330 | |
331 | nothing_to_declare: |
332 | spin_unlock_bh(&dn_rt_hash_table[i].lock); |
333 | } |
334 | } |
335 | |
336 | static DEFINE_SPINLOCK(dn_rt_flush_lock); |
337 | |
338 | void dn_rt_cache_flush(int delay) |
339 | { |
340 | unsigned long now = jiffies; |
341 | int user_mode = !in_interrupt(); |
342 | |
343 | if (delay < 0) |
344 | delay = dn_rt_min_delay; |
345 | |
346 | spin_lock_bh(&dn_rt_flush_lock); |
347 | |
348 | if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) { |
349 | long tmo = (long)(dn_rt_deadline - now); |
350 | |
351 | if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay) |
352 | tmo = 0; |
353 | |
354 | if (delay > tmo) |
355 | delay = tmo; |
356 | } |
357 | |
358 | if (delay <= 0) { |
359 | spin_unlock_bh(&dn_rt_flush_lock); |
360 | dn_run_flush(0); |
361 | return; |
362 | } |
363 | |
364 | if (dn_rt_deadline == 0) |
365 | dn_rt_deadline = now + dn_rt_max_delay; |
366 | |
367 | dn_rt_flush_timer.expires = now + delay; |
368 | add_timer(&dn_rt_flush_timer); |
369 | spin_unlock_bh(&dn_rt_flush_lock); |
370 | } |
371 | |
372 | /** |
373 | * dn_return_short - Return a short packet to its sender |
374 | * @skb: The packet to return |
375 | * |
376 | */ |
377 | static int dn_return_short(struct sk_buff *skb) |
378 | { |
379 | struct dn_skb_cb *cb; |
380 | unsigned char *ptr; |
381 | __le16 *src; |
382 | __le16 *dst; |
383 | |
384 | /* Add back headers */ |
385 | skb_push(skb, skb->data - skb_network_header(skb)); |
386 | |
387 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) |
388 | return NET_RX_DROP; |
389 | |
390 | cb = DN_SKB_CB(skb); |
391 | /* Skip packet length and point to flags */ |
392 | ptr = skb->data + 2; |
393 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; |
394 | |
395 | dst = (__le16 *)ptr; |
396 | ptr += 2; |
397 | src = (__le16 *)ptr; |
398 | ptr += 2; |
399 | *ptr = 0; /* Zero hop count */ |
400 | |
401 | swap(*src, *dst); |
402 | |
403 | skb->pkt_type = PACKET_OUTGOING; |
404 | dn_rt_finish_output(skb, NULL, NULL); |
405 | return NET_RX_SUCCESS; |
406 | } |
407 | |
408 | /** |
409 | * dn_return_long - Return a long packet to its sender |
410 | * @skb: The long format packet to return |
411 | * |
412 | */ |
413 | static int dn_return_long(struct sk_buff *skb) |
414 | { |
415 | struct dn_skb_cb *cb; |
416 | unsigned char *ptr; |
417 | unsigned char *src_addr, *dst_addr; |
418 | unsigned char tmp[ETH_ALEN]; |
419 | |
420 | /* Add back all headers */ |
421 | skb_push(skb, skb->data - skb_network_header(skb)); |
422 | |
423 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) |
424 | return NET_RX_DROP; |
425 | |
426 | cb = DN_SKB_CB(skb); |
427 | /* Ignore packet length and point to flags */ |
428 | ptr = skb->data + 2; |
429 | |
430 | /* Skip padding */ |
431 | if (*ptr & DN_RT_F_PF) { |
432 | char padlen = (*ptr & ~DN_RT_F_PF); |
433 | ptr += padlen; |
434 | } |
435 | |
436 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; |
437 | ptr += 2; |
438 | dst_addr = ptr; |
439 | ptr += 8; |
440 | src_addr = ptr; |
441 | ptr += 6; |
442 | *ptr = 0; /* Zero hop count */ |
443 | |
444 | /* Swap source and destination */ |
445 | memcpy(tmp, src_addr, ETH_ALEN); |
446 | memcpy(src_addr, dst_addr, ETH_ALEN); |
447 | memcpy(dst_addr, tmp, ETH_ALEN); |
448 | |
449 | skb->pkt_type = PACKET_OUTGOING; |
450 | dn_rt_finish_output(skb, dst_addr, src_addr); |
451 | return NET_RX_SUCCESS; |
452 | } |
453 | |
454 | /** |
455 | * dn_route_rx_packet - Try and find a route for an incoming packet |
456 | * @skb: The packet to find a route for |
457 | * |
458 | * Returns: result of input function if route is found, error code otherwise |
459 | */ |
460 | static int dn_route_rx_packet(struct sk_buff *skb) |
461 | { |
462 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
463 | int err; |
464 | |
465 | if ((err = dn_route_input(skb)) == 0) |
466 | return dst_input(skb); |
467 | |
468 | if (decnet_debug_level & 4) { |
469 | char *devname = skb->dev ? skb->dev->name : "???"; |
470 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
471 | printk(KERN_DEBUG |
472 | "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n", |
473 | (int)cb->rt_flags, devname, skb->len, |
474 | le16_to_cpu(cb->src), le16_to_cpu(cb->dst), |
475 | err, skb->pkt_type); |
476 | } |
477 | |
478 | if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) { |
479 | switch(cb->rt_flags & DN_RT_PKT_MSK) { |
480 | case DN_RT_PKT_SHORT: |
481 | return dn_return_short(skb); |
482 | case DN_RT_PKT_LONG: |
483 | return dn_return_long(skb); |
484 | } |
485 | } |
486 | |
487 | kfree_skb(skb); |
488 | return NET_RX_DROP; |
489 | } |
490 | |
491 | static int dn_route_rx_long(struct sk_buff *skb) |
492 | { |
493 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
494 | unsigned char *ptr = skb->data; |
495 | |
496 | if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */ |
497 | goto drop_it; |
498 | |
499 | skb_pull(skb, 20); |
500 | skb_reset_transport_header(skb); |
501 | |
502 | /* Destination info */ |
503 | ptr += 2; |
504 | cb->dst = dn_eth2dn(ptr); |
505 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
506 | goto drop_it; |
507 | ptr += 6; |
508 | |
509 | |
510 | /* Source info */ |
511 | ptr += 2; |
512 | cb->src = dn_eth2dn(ptr); |
513 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
514 | goto drop_it; |
515 | ptr += 6; |
516 | /* Other junk */ |
517 | ptr++; |
518 | cb->hops = *ptr++; /* Visit Count */ |
519 | |
520 | return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, |
521 | dn_route_rx_packet); |
522 | |
523 | drop_it: |
524 | kfree_skb(skb); |
525 | return NET_RX_DROP; |
526 | } |
527 | |
528 | |
529 | |
530 | static int dn_route_rx_short(struct sk_buff *skb) |
531 | { |
532 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
533 | unsigned char *ptr = skb->data; |
534 | |
535 | if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */ |
536 | goto drop_it; |
537 | |
538 | skb_pull(skb, 5); |
539 | skb_reset_transport_header(skb); |
540 | |
541 | cb->dst = *(__le16 *)ptr; |
542 | ptr += 2; |
543 | cb->src = *(__le16 *)ptr; |
544 | ptr += 2; |
545 | cb->hops = *ptr & 0x3f; |
546 | |
547 | return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, |
548 | dn_route_rx_packet); |
549 | |
550 | drop_it: |
551 | kfree_skb(skb); |
552 | return NET_RX_DROP; |
553 | } |
554 | |
555 | static int dn_route_discard(struct sk_buff *skb) |
556 | { |
557 | /* |
558 | * I know we drop the packet here, but thats considered success in |
559 | * this case |
560 | */ |
561 | kfree_skb(skb); |
562 | return NET_RX_SUCCESS; |
563 | } |
564 | |
565 | static int dn_route_ptp_hello(struct sk_buff *skb) |
566 | { |
567 | dn_dev_hello(skb); |
568 | dn_neigh_pointopoint_hello(skb); |
569 | return NET_RX_SUCCESS; |
570 | } |
571 | |
572 | int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
573 | { |
574 | struct dn_skb_cb *cb; |
575 | unsigned char flags = 0; |
576 | __u16 len = le16_to_cpu(*(__le16 *)skb->data); |
577 | struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr; |
578 | unsigned char padlen = 0; |
579 | |
580 | if (!net_eq(dev_net(dev), &init_net)) |
581 | goto dump_it; |
582 | |
583 | if (dn == NULL) |
584 | goto dump_it; |
585 | |
586 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
587 | goto out; |
588 | |
589 | if (!pskb_may_pull(skb, 3)) |
590 | goto dump_it; |
591 | |
592 | skb_pull(skb, 2); |
593 | |
594 | if (len > skb->len) |
595 | goto dump_it; |
596 | |
597 | skb_trim(skb, len); |
598 | |
599 | flags = *skb->data; |
600 | |
601 | cb = DN_SKB_CB(skb); |
602 | cb->stamp = jiffies; |
603 | cb->iif = dev->ifindex; |
604 | |
605 | /* |
606 | * If we have padding, remove it. |
607 | */ |
608 | if (flags & DN_RT_F_PF) { |
609 | padlen = flags & ~DN_RT_F_PF; |
610 | if (!pskb_may_pull(skb, padlen + 1)) |
611 | goto dump_it; |
612 | skb_pull(skb, padlen); |
613 | flags = *skb->data; |
614 | } |
615 | |
616 | skb_reset_network_header(skb); |
617 | |
618 | /* |
619 | * Weed out future version DECnet |
620 | */ |
621 | if (flags & DN_RT_F_VER) |
622 | goto dump_it; |
623 | |
624 | cb->rt_flags = flags; |
625 | |
626 | if (decnet_debug_level & 1) |
627 | printk(KERN_DEBUG |
628 | "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n", |
629 | (int)flags, (dev) ? dev->name : "???", len, skb->len, |
630 | padlen); |
631 | |
632 | if (flags & DN_RT_PKT_CNTL) { |
633 | if (unlikely(skb_linearize(skb))) |
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(NFPROTO_DECNET, NF_DN_HELLO, |
651 | skb, skb->dev, NULL, |
652 | dn_route_ptp_hello); |
653 | |
654 | case DN_RT_PKT_L1RT: |
655 | case DN_RT_PKT_L2RT: |
656 | return NF_HOOK(NFPROTO_DECNET, NF_DN_ROUTE, |
657 | skb, skb->dev, NULL, |
658 | dn_route_discard); |
659 | case DN_RT_PKT_ERTH: |
660 | return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, |
661 | skb, skb->dev, NULL, |
662 | dn_neigh_router_hello); |
663 | |
664 | case DN_RT_PKT_EEDH: |
665 | return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, |
666 | skb, skb->dev, NULL, |
667 | dn_neigh_endnode_hello); |
668 | } |
669 | } else { |
670 | if (dn->parms.state != DN_DEV_S_RU) |
671 | goto dump_it; |
672 | |
673 | skb_pull(skb, 1); /* Pull flags */ |
674 | |
675 | switch(flags & DN_RT_PKT_MSK) { |
676 | case DN_RT_PKT_LONG: |
677 | return dn_route_rx_long(skb); |
678 | case DN_RT_PKT_SHORT: |
679 | return dn_route_rx_short(skb); |
680 | } |
681 | } |
682 | |
683 | dump_it: |
684 | kfree_skb(skb); |
685 | out: |
686 | return NET_RX_DROP; |
687 | } |
688 | |
689 | static int dn_output(struct sk_buff *skb) |
690 | { |
691 | struct dst_entry *dst = skb_dst(skb); |
692 | struct dn_route *rt = (struct dn_route *)dst; |
693 | struct net_device *dev = dst->dev; |
694 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
695 | struct neighbour *neigh; |
696 | |
697 | int err = -EINVAL; |
698 | |
699 | if ((neigh = dst->neighbour) == NULL) |
700 | goto error; |
701 | |
702 | skb->dev = dev; |
703 | |
704 | cb->src = rt->rt_saddr; |
705 | cb->dst = rt->rt_daddr; |
706 | |
707 | /* |
708 | * Always set the Intra-Ethernet bit on all outgoing packets |
709 | * originated on this node. Only valid flag from upper layers |
710 | * is return-to-sender-requested. Set hop count to 0 too. |
711 | */ |
712 | cb->rt_flags &= ~DN_RT_F_RQR; |
713 | cb->rt_flags |= DN_RT_F_IE; |
714 | cb->hops = 0; |
715 | |
716 | return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_OUT, skb, NULL, dev, |
717 | neigh->output); |
718 | |
719 | error: |
720 | if (net_ratelimit()) |
721 | printk(KERN_DEBUG "dn_output: This should not happen\n"); |
722 | |
723 | kfree_skb(skb); |
724 | |
725 | return err; |
726 | } |
727 | |
728 | static int dn_forward(struct sk_buff *skb) |
729 | { |
730 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
731 | struct dst_entry *dst = skb_dst(skb); |
732 | struct dn_dev *dn_db = dst->dev->dn_ptr; |
733 | struct dn_route *rt; |
734 | struct neighbour *neigh = dst->neighbour; |
735 | int header_len; |
736 | #ifdef CONFIG_NETFILTER |
737 | struct net_device *dev = skb->dev; |
738 | #endif |
739 | |
740 | if (skb->pkt_type != PACKET_HOST) |
741 | goto drop; |
742 | |
743 | /* Ensure that we have enough space for headers */ |
744 | rt = (struct dn_route *)skb_dst(skb); |
745 | header_len = dn_db->use_long ? 21 : 6; |
746 | if (skb_cow(skb, LL_RESERVED_SPACE(rt->dst.dev)+header_len)) |
747 | goto drop; |
748 | |
749 | /* |
750 | * Hop count exceeded. |
751 | */ |
752 | if (++cb->hops > 30) |
753 | goto drop; |
754 | |
755 | skb->dev = rt->dst.dev; |
756 | |
757 | /* |
758 | * If packet goes out same interface it came in on, then set |
759 | * the Intra-Ethernet bit. This has no effect for short |
760 | * packets, so we don't need to test for them here. |
761 | */ |
762 | cb->rt_flags &= ~DN_RT_F_IE; |
763 | if (rt->rt_flags & RTCF_DOREDIRECT) |
764 | cb->rt_flags |= DN_RT_F_IE; |
765 | |
766 | return NF_HOOK(NFPROTO_DECNET, NF_DN_FORWARD, skb, dev, skb->dev, |
767 | neigh->output); |
768 | |
769 | drop: |
770 | kfree_skb(skb); |
771 | return NET_RX_DROP; |
772 | } |
773 | |
774 | /* |
775 | * Used to catch bugs. This should never normally get |
776 | * called. |
777 | */ |
778 | static int dn_rt_bug(struct sk_buff *skb) |
779 | { |
780 | if (net_ratelimit()) { |
781 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
782 | |
783 | printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n", |
784 | le16_to_cpu(cb->src), le16_to_cpu(cb->dst)); |
785 | } |
786 | |
787 | kfree_skb(skb); |
788 | |
789 | return NET_RX_DROP; |
790 | } |
791 | |
792 | static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res) |
793 | { |
794 | struct dn_fib_info *fi = res->fi; |
795 | struct net_device *dev = rt->dst.dev; |
796 | struct neighbour *n; |
797 | unsigned mss; |
798 | |
799 | if (fi) { |
800 | if (DN_FIB_RES_GW(*res) && |
801 | DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) |
802 | rt->rt_gateway = DN_FIB_RES_GW(*res); |
803 | memcpy(rt->dst.metrics, fi->fib_metrics, |
804 | sizeof(rt->dst.metrics)); |
805 | } |
806 | rt->rt_type = res->type; |
807 | |
808 | if (dev != NULL && rt->dst.neighbour == NULL) { |
809 | n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev); |
810 | if (IS_ERR(n)) |
811 | return PTR_ERR(n); |
812 | rt->dst.neighbour = n; |
813 | } |
814 | |
815 | if (dst_metric(&rt->dst, RTAX_MTU) == 0 || |
816 | dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu) |
817 | rt->dst.metrics[RTAX_MTU-1] = rt->dst.dev->mtu; |
818 | mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->dst)); |
819 | if (dst_metric(&rt->dst, RTAX_ADVMSS) == 0 || |
820 | dst_metric(&rt->dst, RTAX_ADVMSS) > mss) |
821 | rt->dst.metrics[RTAX_ADVMSS-1] = mss; |
822 | return 0; |
823 | } |
824 | |
825 | static inline int dn_match_addr(__le16 addr1, __le16 addr2) |
826 | { |
827 | __u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(addr2); |
828 | int match = 16; |
829 | while(tmp) { |
830 | tmp >>= 1; |
831 | match--; |
832 | } |
833 | return match; |
834 | } |
835 | |
836 | static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope) |
837 | { |
838 | __le16 saddr = 0; |
839 | struct dn_dev *dn_db = dev->dn_ptr; |
840 | struct dn_ifaddr *ifa; |
841 | int best_match = 0; |
842 | int ret; |
843 | |
844 | read_lock(&dev_base_lock); |
845 | for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) { |
846 | if (ifa->ifa_scope > scope) |
847 | continue; |
848 | if (!daddr) { |
849 | saddr = ifa->ifa_local; |
850 | break; |
851 | } |
852 | ret = dn_match_addr(daddr, ifa->ifa_local); |
853 | if (ret > best_match) |
854 | saddr = ifa->ifa_local; |
855 | if (best_match == 0) |
856 | saddr = ifa->ifa_local; |
857 | } |
858 | read_unlock(&dev_base_lock); |
859 | |
860 | return saddr; |
861 | } |
862 | |
863 | static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res) |
864 | { |
865 | return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope); |
866 | } |
867 | |
868 | static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res) |
869 | { |
870 | __le16 mask = dnet_make_mask(res->prefixlen); |
871 | return (daddr&~mask)|res->fi->fib_nh->nh_gw; |
872 | } |
873 | |
874 | static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard) |
875 | { |
876 | struct flowi fl = { .nl_u = { .dn_u = |
877 | { .daddr = oldflp->fld_dst, |
878 | .saddr = oldflp->fld_src, |
879 | .scope = RT_SCOPE_UNIVERSE, |
880 | } }, |
881 | .mark = oldflp->mark, |
882 | .iif = init_net.loopback_dev->ifindex, |
883 | .oif = oldflp->oif }; |
884 | struct dn_route *rt = NULL; |
885 | struct net_device *dev_out = NULL, *dev; |
886 | struct neighbour *neigh = NULL; |
887 | unsigned hash; |
888 | unsigned flags = 0; |
889 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST }; |
890 | int err; |
891 | int free_res = 0; |
892 | __le16 gateway = 0; |
893 | |
894 | if (decnet_debug_level & 16) |
895 | printk(KERN_DEBUG |
896 | "dn_route_output_slow: dst=%04x src=%04x mark=%d" |
897 | " iif=%d oif=%d\n", le16_to_cpu(oldflp->fld_dst), |
898 | le16_to_cpu(oldflp->fld_src), |
899 | oldflp->mark, init_net.loopback_dev->ifindex, oldflp->oif); |
900 | |
901 | /* If we have an output interface, verify its a DECnet device */ |
902 | if (oldflp->oif) { |
903 | dev_out = dev_get_by_index(&init_net, oldflp->oif); |
904 | err = -ENODEV; |
905 | if (dev_out && dev_out->dn_ptr == NULL) { |
906 | dev_put(dev_out); |
907 | dev_out = NULL; |
908 | } |
909 | if (dev_out == NULL) |
910 | goto out; |
911 | } |
912 | |
913 | /* If we have a source address, verify that its a local address */ |
914 | if (oldflp->fld_src) { |
915 | err = -EADDRNOTAVAIL; |
916 | |
917 | if (dev_out) { |
918 | if (dn_dev_islocal(dev_out, oldflp->fld_src)) |
919 | goto source_ok; |
920 | dev_put(dev_out); |
921 | goto out; |
922 | } |
923 | rcu_read_lock(); |
924 | for_each_netdev_rcu(&init_net, dev) { |
925 | if (!dev->dn_ptr) |
926 | continue; |
927 | if (!dn_dev_islocal(dev, oldflp->fld_src)) |
928 | continue; |
929 | if ((dev->flags & IFF_LOOPBACK) && |
930 | oldflp->fld_dst && |
931 | !dn_dev_islocal(dev, oldflp->fld_dst)) |
932 | continue; |
933 | |
934 | dev_out = dev; |
935 | break; |
936 | } |
937 | rcu_read_unlock(); |
938 | if (dev_out == NULL) |
939 | goto out; |
940 | dev_hold(dev_out); |
941 | source_ok: |
942 | ; |
943 | } |
944 | |
945 | /* No destination? Assume its local */ |
946 | if (!fl.fld_dst) { |
947 | fl.fld_dst = fl.fld_src; |
948 | |
949 | err = -EADDRNOTAVAIL; |
950 | if (dev_out) |
951 | dev_put(dev_out); |
952 | dev_out = init_net.loopback_dev; |
953 | dev_hold(dev_out); |
954 | if (!fl.fld_dst) { |
955 | fl.fld_dst = |
956 | fl.fld_src = dnet_select_source(dev_out, 0, |
957 | RT_SCOPE_HOST); |
958 | if (!fl.fld_dst) |
959 | goto out; |
960 | } |
961 | fl.oif = init_net.loopback_dev->ifindex; |
962 | res.type = RTN_LOCAL; |
963 | goto make_route; |
964 | } |
965 | |
966 | if (decnet_debug_level & 16) |
967 | printk(KERN_DEBUG |
968 | "dn_route_output_slow: initial checks complete." |
969 | " dst=%o4x src=%04x oif=%d try_hard=%d\n", |
970 | le16_to_cpu(fl.fld_dst), le16_to_cpu(fl.fld_src), |
971 | fl.oif, try_hard); |
972 | |
973 | /* |
974 | * N.B. If the kernel is compiled without router support then |
975 | * dn_fib_lookup() will evaluate to non-zero so this if () block |
976 | * will always be executed. |
977 | */ |
978 | err = -ESRCH; |
979 | if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) { |
980 | struct dn_dev *dn_db; |
981 | if (err != -ESRCH) |
982 | goto out; |
983 | /* |
984 | * Here the fallback is basically the standard algorithm for |
985 | * routing in endnodes which is described in the DECnet routing |
986 | * docs |
987 | * |
988 | * If we are not trying hard, look in neighbour cache. |
989 | * The result is tested to ensure that if a specific output |
990 | * device/source address was requested, then we honour that |
991 | * here |
992 | */ |
993 | if (!try_hard) { |
994 | neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fl.fld_dst); |
995 | if (neigh) { |
996 | if ((oldflp->oif && |
997 | (neigh->dev->ifindex != oldflp->oif)) || |
998 | (oldflp->fld_src && |
999 | (!dn_dev_islocal(neigh->dev, |
1000 | oldflp->fld_src)))) { |
1001 | neigh_release(neigh); |
1002 | neigh = NULL; |
1003 | } else { |
1004 | if (dev_out) |
1005 | dev_put(dev_out); |
1006 | if (dn_dev_islocal(neigh->dev, fl.fld_dst)) { |
1007 | dev_out = init_net.loopback_dev; |
1008 | res.type = RTN_LOCAL; |
1009 | } else { |
1010 | dev_out = neigh->dev; |
1011 | } |
1012 | dev_hold(dev_out); |
1013 | goto select_source; |
1014 | } |
1015 | } |
1016 | } |
1017 | |
1018 | /* Not there? Perhaps its a local address */ |
1019 | if (dev_out == NULL) |
1020 | dev_out = dn_dev_get_default(); |
1021 | err = -ENODEV; |
1022 | if (dev_out == NULL) |
1023 | goto out; |
1024 | dn_db = dev_out->dn_ptr; |
1025 | /* Possible improvement - check all devices for local addr */ |
1026 | if (dn_dev_islocal(dev_out, fl.fld_dst)) { |
1027 | dev_put(dev_out); |
1028 | dev_out = init_net.loopback_dev; |
1029 | dev_hold(dev_out); |
1030 | res.type = RTN_LOCAL; |
1031 | goto select_source; |
1032 | } |
1033 | /* Not local either.... try sending it to the default router */ |
1034 | neigh = neigh_clone(dn_db->router); |
1035 | BUG_ON(neigh && neigh->dev != dev_out); |
1036 | |
1037 | /* Ok then, we assume its directly connected and move on */ |
1038 | select_source: |
1039 | if (neigh) |
1040 | gateway = ((struct dn_neigh *)neigh)->addr; |
1041 | if (gateway == 0) |
1042 | gateway = fl.fld_dst; |
1043 | if (fl.fld_src == 0) { |
1044 | fl.fld_src = dnet_select_source(dev_out, gateway, |
1045 | res.type == RTN_LOCAL ? |
1046 | RT_SCOPE_HOST : |
1047 | RT_SCOPE_LINK); |
1048 | if (fl.fld_src == 0 && res.type != RTN_LOCAL) |
1049 | goto e_addr; |
1050 | } |
1051 | fl.oif = dev_out->ifindex; |
1052 | goto make_route; |
1053 | } |
1054 | free_res = 1; |
1055 | |
1056 | if (res.type == RTN_NAT) |
1057 | goto e_inval; |
1058 | |
1059 | if (res.type == RTN_LOCAL) { |
1060 | if (!fl.fld_src) |
1061 | fl.fld_src = fl.fld_dst; |
1062 | if (dev_out) |
1063 | dev_put(dev_out); |
1064 | dev_out = init_net.loopback_dev; |
1065 | dev_hold(dev_out); |
1066 | fl.oif = dev_out->ifindex; |
1067 | if (res.fi) |
1068 | dn_fib_info_put(res.fi); |
1069 | res.fi = NULL; |
1070 | goto make_route; |
1071 | } |
1072 | |
1073 | if (res.fi->fib_nhs > 1 && fl.oif == 0) |
1074 | dn_fib_select_multipath(&fl, &res); |
1075 | |
1076 | /* |
1077 | * We could add some logic to deal with default routes here and |
1078 | * get rid of some of the special casing above. |
1079 | */ |
1080 | |
1081 | if (!fl.fld_src) |
1082 | fl.fld_src = DN_FIB_RES_PREFSRC(res); |
1083 | |
1084 | if (dev_out) |
1085 | dev_put(dev_out); |
1086 | dev_out = DN_FIB_RES_DEV(res); |
1087 | dev_hold(dev_out); |
1088 | fl.oif = dev_out->ifindex; |
1089 | gateway = DN_FIB_RES_GW(res); |
1090 | |
1091 | make_route: |
1092 | if (dev_out->flags & IFF_LOOPBACK) |
1093 | flags |= RTCF_LOCAL; |
1094 | |
1095 | rt = dst_alloc(&dn_dst_ops); |
1096 | if (rt == NULL) |
1097 | goto e_nobufs; |
1098 | |
1099 | atomic_set(&rt->dst.__refcnt, 1); |
1100 | rt->dst.flags = DST_HOST; |
1101 | |
1102 | rt->fl.fld_src = oldflp->fld_src; |
1103 | rt->fl.fld_dst = oldflp->fld_dst; |
1104 | rt->fl.oif = oldflp->oif; |
1105 | rt->fl.iif = 0; |
1106 | rt->fl.mark = oldflp->mark; |
1107 | |
1108 | rt->rt_saddr = fl.fld_src; |
1109 | rt->rt_daddr = fl.fld_dst; |
1110 | rt->rt_gateway = gateway ? gateway : fl.fld_dst; |
1111 | rt->rt_local_src = fl.fld_src; |
1112 | |
1113 | rt->rt_dst_map = fl.fld_dst; |
1114 | rt->rt_src_map = fl.fld_src; |
1115 | |
1116 | rt->dst.dev = dev_out; |
1117 | dev_hold(dev_out); |
1118 | rt->dst.neighbour = neigh; |
1119 | neigh = NULL; |
1120 | |
1121 | rt->dst.lastuse = jiffies; |
1122 | rt->dst.output = dn_output; |
1123 | rt->dst.input = dn_rt_bug; |
1124 | rt->rt_flags = flags; |
1125 | if (flags & RTCF_LOCAL) |
1126 | rt->dst.input = dn_nsp_rx; |
1127 | |
1128 | err = dn_rt_set_next_hop(rt, &res); |
1129 | if (err) |
1130 | goto e_neighbour; |
1131 | |
1132 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); |
1133 | dn_insert_route(rt, hash, (struct dn_route **)pprt); |
1134 | |
1135 | done: |
1136 | if (neigh) |
1137 | neigh_release(neigh); |
1138 | if (free_res) |
1139 | dn_fib_res_put(&res); |
1140 | if (dev_out) |
1141 | dev_put(dev_out); |
1142 | out: |
1143 | return err; |
1144 | |
1145 | e_addr: |
1146 | err = -EADDRNOTAVAIL; |
1147 | goto done; |
1148 | e_inval: |
1149 | err = -EINVAL; |
1150 | goto done; |
1151 | e_nobufs: |
1152 | err = -ENOBUFS; |
1153 | goto done; |
1154 | e_neighbour: |
1155 | dst_free(&rt->dst); |
1156 | goto e_nobufs; |
1157 | } |
1158 | |
1159 | |
1160 | /* |
1161 | * N.B. The flags may be moved into the flowi at some future stage. |
1162 | */ |
1163 | static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags) |
1164 | { |
1165 | unsigned hash = dn_hash(flp->fld_src, flp->fld_dst); |
1166 | struct dn_route *rt = NULL; |
1167 | |
1168 | if (!(flags & MSG_TRYHARD)) { |
1169 | rcu_read_lock_bh(); |
1170 | for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt; |
1171 | rt = rcu_dereference_bh(rt->dst.dn_next)) { |
1172 | if ((flp->fld_dst == rt->fl.fld_dst) && |
1173 | (flp->fld_src == rt->fl.fld_src) && |
1174 | (flp->mark == rt->fl.mark) && |
1175 | (rt->fl.iif == 0) && |
1176 | (rt->fl.oif == flp->oif)) { |
1177 | dst_use(&rt->dst, jiffies); |
1178 | rcu_read_unlock_bh(); |
1179 | *pprt = &rt->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(&init_net, 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(&init_net, pprt, fl, sk, |
1207 | (flags & MSG_DONTWAIT) ? 0 : XFRM_LOOKUP_WAIT); |
1208 | } |
1209 | return err; |
1210 | } |
1211 | |
1212 | static int dn_route_input_slow(struct sk_buff *skb) |
1213 | { |
1214 | struct dn_route *rt = NULL; |
1215 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
1216 | struct net_device *in_dev = skb->dev; |
1217 | struct net_device *out_dev = NULL; |
1218 | struct dn_dev *dn_db; |
1219 | struct neighbour *neigh = NULL; |
1220 | unsigned hash; |
1221 | int flags = 0; |
1222 | __le16 gateway = 0; |
1223 | __le16 local_src = 0; |
1224 | struct flowi fl = { .nl_u = { .dn_u = |
1225 | { .daddr = cb->dst, |
1226 | .saddr = cb->src, |
1227 | .scope = RT_SCOPE_UNIVERSE, |
1228 | } }, |
1229 | .mark = skb->mark, |
1230 | .iif = skb->dev->ifindex }; |
1231 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE }; |
1232 | int err = -EINVAL; |
1233 | int free_res = 0; |
1234 | |
1235 | dev_hold(in_dev); |
1236 | |
1237 | if ((dn_db = in_dev->dn_ptr) == NULL) |
1238 | goto out; |
1239 | |
1240 | /* Zero source addresses are not allowed */ |
1241 | if (fl.fld_src == 0) |
1242 | goto out; |
1243 | |
1244 | /* |
1245 | * In this case we've just received a packet from a source |
1246 | * outside ourselves pretending to come from us. We don't |
1247 | * allow it any further to prevent routing loops, spoofing and |
1248 | * other nasties. Loopback packets already have the dst attached |
1249 | * so this only affects packets which have originated elsewhere. |
1250 | */ |
1251 | err = -ENOTUNIQ; |
1252 | if (dn_dev_islocal(in_dev, cb->src)) |
1253 | goto out; |
1254 | |
1255 | err = dn_fib_lookup(&fl, &res); |
1256 | if (err) { |
1257 | if (err != -ESRCH) |
1258 | goto out; |
1259 | /* |
1260 | * Is the destination us ? |
1261 | */ |
1262 | if (!dn_dev_islocal(in_dev, cb->dst)) |
1263 | goto e_inval; |
1264 | |
1265 | res.type = RTN_LOCAL; |
1266 | } else { |
1267 | __le16 src_map = fl.fld_src; |
1268 | free_res = 1; |
1269 | |
1270 | out_dev = DN_FIB_RES_DEV(res); |
1271 | if (out_dev == NULL) { |
1272 | if (net_ratelimit()) |
1273 | printk(KERN_CRIT "Bug in dn_route_input_slow() " |
1274 | "No output device\n"); |
1275 | goto e_inval; |
1276 | } |
1277 | dev_hold(out_dev); |
1278 | |
1279 | if (res.r) |
1280 | src_map = fl.fld_src; /* no NAT support for now */ |
1281 | |
1282 | gateway = DN_FIB_RES_GW(res); |
1283 | if (res.type == RTN_NAT) { |
1284 | fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res); |
1285 | dn_fib_res_put(&res); |
1286 | free_res = 0; |
1287 | if (dn_fib_lookup(&fl, &res)) |
1288 | goto e_inval; |
1289 | free_res = 1; |
1290 | if (res.type != RTN_UNICAST) |
1291 | goto e_inval; |
1292 | flags |= RTCF_DNAT; |
1293 | gateway = fl.fld_dst; |
1294 | } |
1295 | fl.fld_src = src_map; |
1296 | } |
1297 | |
1298 | switch(res.type) { |
1299 | case RTN_UNICAST: |
1300 | /* |
1301 | * Forwarding check here, we only check for forwarding |
1302 | * being turned off, if you want to only forward intra |
1303 | * area, its up to you to set the routing tables up |
1304 | * correctly. |
1305 | */ |
1306 | if (dn_db->parms.forwarding == 0) |
1307 | goto e_inval; |
1308 | |
1309 | if (res.fi->fib_nhs > 1 && fl.oif == 0) |
1310 | dn_fib_select_multipath(&fl, &res); |
1311 | |
1312 | /* |
1313 | * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT |
1314 | * flag as a hint to set the intra-ethernet bit when |
1315 | * forwarding. If we've got NAT in operation, we don't do |
1316 | * this optimisation. |
1317 | */ |
1318 | if (out_dev == in_dev && !(flags & RTCF_NAT)) |
1319 | flags |= RTCF_DOREDIRECT; |
1320 | |
1321 | local_src = DN_FIB_RES_PREFSRC(res); |
1322 | |
1323 | case RTN_BLACKHOLE: |
1324 | case RTN_UNREACHABLE: |
1325 | break; |
1326 | case RTN_LOCAL: |
1327 | flags |= RTCF_LOCAL; |
1328 | fl.fld_src = cb->dst; |
1329 | fl.fld_dst = cb->src; |
1330 | |
1331 | /* Routing tables gave us a gateway */ |
1332 | if (gateway) |
1333 | goto make_route; |
1334 | |
1335 | /* Packet was intra-ethernet, so we know its on-link */ |
1336 | if (cb->rt_flags & DN_RT_F_IE) { |
1337 | gateway = cb->src; |
1338 | flags |= RTCF_DIRECTSRC; |
1339 | goto make_route; |
1340 | } |
1341 | |
1342 | /* Use the default router if there is one */ |
1343 | neigh = neigh_clone(dn_db->router); |
1344 | if (neigh) { |
1345 | gateway = ((struct dn_neigh *)neigh)->addr; |
1346 | goto make_route; |
1347 | } |
1348 | |
1349 | /* Close eyes and pray */ |
1350 | gateway = cb->src; |
1351 | flags |= RTCF_DIRECTSRC; |
1352 | goto make_route; |
1353 | default: |
1354 | goto e_inval; |
1355 | } |
1356 | |
1357 | make_route: |
1358 | rt = dst_alloc(&dn_dst_ops); |
1359 | if (rt == NULL) |
1360 | goto e_nobufs; |
1361 | |
1362 | rt->rt_saddr = fl.fld_src; |
1363 | rt->rt_daddr = fl.fld_dst; |
1364 | rt->rt_gateway = fl.fld_dst; |
1365 | if (gateway) |
1366 | rt->rt_gateway = gateway; |
1367 | rt->rt_local_src = local_src ? local_src : rt->rt_saddr; |
1368 | |
1369 | rt->rt_dst_map = fl.fld_dst; |
1370 | rt->rt_src_map = fl.fld_src; |
1371 | |
1372 | rt->fl.fld_src = cb->src; |
1373 | rt->fl.fld_dst = cb->dst; |
1374 | rt->fl.oif = 0; |
1375 | rt->fl.iif = in_dev->ifindex; |
1376 | rt->fl.mark = fl.mark; |
1377 | |
1378 | rt->dst.flags = DST_HOST; |
1379 | rt->dst.neighbour = neigh; |
1380 | rt->dst.dev = out_dev; |
1381 | rt->dst.lastuse = jiffies; |
1382 | rt->dst.output = dn_rt_bug; |
1383 | switch(res.type) { |
1384 | case RTN_UNICAST: |
1385 | rt->dst.input = dn_forward; |
1386 | break; |
1387 | case RTN_LOCAL: |
1388 | rt->dst.output = dn_output; |
1389 | rt->dst.input = dn_nsp_rx; |
1390 | rt->dst.dev = in_dev; |
1391 | flags |= RTCF_LOCAL; |
1392 | break; |
1393 | default: |
1394 | case RTN_UNREACHABLE: |
1395 | case RTN_BLACKHOLE: |
1396 | rt->dst.input = dst_discard; |
1397 | } |
1398 | rt->rt_flags = flags; |
1399 | if (rt->dst.dev) |
1400 | dev_hold(rt->dst.dev); |
1401 | |
1402 | err = dn_rt_set_next_hop(rt, &res); |
1403 | if (err) |
1404 | goto e_neighbour; |
1405 | |
1406 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); |
1407 | dn_insert_route(rt, hash, &rt); |
1408 | skb_dst_set(skb, &rt->dst); |
1409 | |
1410 | done: |
1411 | if (neigh) |
1412 | neigh_release(neigh); |
1413 | if (free_res) |
1414 | dn_fib_res_put(&res); |
1415 | dev_put(in_dev); |
1416 | if (out_dev) |
1417 | dev_put(out_dev); |
1418 | out: |
1419 | return err; |
1420 | |
1421 | e_inval: |
1422 | err = -EINVAL; |
1423 | goto done; |
1424 | |
1425 | e_nobufs: |
1426 | err = -ENOBUFS; |
1427 | goto done; |
1428 | |
1429 | e_neighbour: |
1430 | dst_free(&rt->dst); |
1431 | goto done; |
1432 | } |
1433 | |
1434 | static int dn_route_input(struct sk_buff *skb) |
1435 | { |
1436 | struct dn_route *rt; |
1437 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
1438 | unsigned hash = dn_hash(cb->src, cb->dst); |
1439 | |
1440 | if (skb_dst(skb)) |
1441 | return 0; |
1442 | |
1443 | rcu_read_lock(); |
1444 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL; |
1445 | rt = rcu_dereference(rt->dst.dn_next)) { |
1446 | if ((rt->fl.fld_src == cb->src) && |
1447 | (rt->fl.fld_dst == cb->dst) && |
1448 | (rt->fl.oif == 0) && |
1449 | (rt->fl.mark == skb->mark) && |
1450 | (rt->fl.iif == cb->iif)) { |
1451 | dst_use(&rt->dst, jiffies); |
1452 | rcu_read_unlock(); |
1453 | skb_dst_set(skb, (struct dst_entry *)rt); |
1454 | return 0; |
1455 | } |
1456 | } |
1457 | rcu_read_unlock(); |
1458 | |
1459 | return dn_route_input_slow(skb); |
1460 | } |
1461 | |
1462 | static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
1463 | int event, int nowait, unsigned int flags) |
1464 | { |
1465 | struct dn_route *rt = (struct dn_route *)skb_dst(skb); |
1466 | struct rtmsg *r; |
1467 | struct nlmsghdr *nlh; |
1468 | unsigned char *b = skb_tail_pointer(skb); |
1469 | long expires; |
1470 | |
1471 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); |
1472 | r = NLMSG_DATA(nlh); |
1473 | r->rtm_family = AF_DECnet; |
1474 | r->rtm_dst_len = 16; |
1475 | r->rtm_src_len = 0; |
1476 | r->rtm_tos = 0; |
1477 | r->rtm_table = RT_TABLE_MAIN; |
1478 | RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1479 | r->rtm_type = rt->rt_type; |
1480 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; |
1481 | r->rtm_scope = RT_SCOPE_UNIVERSE; |
1482 | r->rtm_protocol = RTPROT_UNSPEC; |
1483 | if (rt->rt_flags & RTCF_NOTIFY) |
1484 | r->rtm_flags |= RTM_F_NOTIFY; |
1485 | RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr); |
1486 | if (rt->fl.fld_src) { |
1487 | r->rtm_src_len = 16; |
1488 | RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src); |
1489 | } |
1490 | if (rt->dst.dev) |
1491 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->dst.dev->ifindex); |
1492 | /* |
1493 | * Note to self - change this if input routes reverse direction when |
1494 | * they deal only with inputs and not with replies like they do |
1495 | * currently. |
1496 | */ |
1497 | RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src); |
1498 | if (rt->rt_daddr != rt->rt_gateway) |
1499 | RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway); |
1500 | if (rtnetlink_put_metrics(skb, rt->dst.metrics) < 0) |
1501 | goto rtattr_failure; |
1502 | expires = rt->dst.expires ? rt->dst.expires - jiffies : 0; |
1503 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0, expires, |
1504 | rt->dst.error) < 0) |
1505 | goto rtattr_failure; |
1506 | if (rt->fl.iif) |
1507 | RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif); |
1508 | |
1509 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1510 | return skb->len; |
1511 | |
1512 | nlmsg_failure: |
1513 | rtattr_failure: |
1514 | nlmsg_trim(skb, b); |
1515 | return -1; |
1516 | } |
1517 | |
1518 | /* |
1519 | * This is called by both endnodes and routers now. |
1520 | */ |
1521 | static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg) |
1522 | { |
1523 | struct net *net = sock_net(in_skb->sk); |
1524 | struct rtattr **rta = arg; |
1525 | struct rtmsg *rtm = NLMSG_DATA(nlh); |
1526 | struct dn_route *rt = NULL; |
1527 | struct dn_skb_cb *cb; |
1528 | int err; |
1529 | struct sk_buff *skb; |
1530 | struct flowi fl; |
1531 | |
1532 | if (!net_eq(net, &init_net)) |
1533 | return -EINVAL; |
1534 | |
1535 | memset(&fl, 0, sizeof(fl)); |
1536 | fl.proto = DNPROTO_NSP; |
1537 | |
1538 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
1539 | if (skb == NULL) |
1540 | return -ENOBUFS; |
1541 | skb_reset_mac_header(skb); |
1542 | cb = DN_SKB_CB(skb); |
1543 | |
1544 | if (rta[RTA_SRC-1]) |
1545 | memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2); |
1546 | if (rta[RTA_DST-1]) |
1547 | memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2); |
1548 | if (rta[RTA_IIF-1]) |
1549 | memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); |
1550 | |
1551 | if (fl.iif) { |
1552 | struct net_device *dev; |
1553 | if ((dev = dev_get_by_index(&init_net, fl.iif)) == NULL) { |
1554 | kfree_skb(skb); |
1555 | return -ENODEV; |
1556 | } |
1557 | if (!dev->dn_ptr) { |
1558 | dev_put(dev); |
1559 | kfree_skb(skb); |
1560 | return -ENODEV; |
1561 | } |
1562 | skb->protocol = htons(ETH_P_DNA_RT); |
1563 | skb->dev = dev; |
1564 | cb->src = fl.fld_src; |
1565 | cb->dst = fl.fld_dst; |
1566 | local_bh_disable(); |
1567 | err = dn_route_input(skb); |
1568 | local_bh_enable(); |
1569 | memset(cb, 0, sizeof(struct dn_skb_cb)); |
1570 | rt = (struct dn_route *)skb_dst(skb); |
1571 | if (!err && -rt->dst.error) |
1572 | err = rt->dst.error; |
1573 | } else { |
1574 | int oif = 0; |
1575 | if (rta[RTA_OIF - 1]) |
1576 | memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int)); |
1577 | fl.oif = oif; |
1578 | err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0); |
1579 | } |
1580 | |
1581 | if (skb->dev) |
1582 | dev_put(skb->dev); |
1583 | skb->dev = NULL; |
1584 | if (err) |
1585 | goto out_free; |
1586 | skb_dst_set(skb, &rt->dst); |
1587 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
1588 | rt->rt_flags |= RTCF_NOTIFY; |
1589 | |
1590 | err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0); |
1591 | |
1592 | if (err == 0) |
1593 | goto out_free; |
1594 | if (err < 0) { |
1595 | err = -EMSGSIZE; |
1596 | goto out_free; |
1597 | } |
1598 | |
1599 | return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
1600 | |
1601 | out_free: |
1602 | kfree_skb(skb); |
1603 | return err; |
1604 | } |
1605 | |
1606 | /* |
1607 | * For routers, this is called from dn_fib_dump, but for endnodes its |
1608 | * called directly from the rtnetlink dispatch table. |
1609 | */ |
1610 | int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb) |
1611 | { |
1612 | struct net *net = sock_net(skb->sk); |
1613 | struct dn_route *rt; |
1614 | int h, s_h; |
1615 | int idx, s_idx; |
1616 | |
1617 | if (!net_eq(net, &init_net)) |
1618 | return 0; |
1619 | |
1620 | if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg)) |
1621 | return -EINVAL; |
1622 | if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)) |
1623 | return 0; |
1624 | |
1625 | s_h = cb->args[0]; |
1626 | s_idx = idx = cb->args[1]; |
1627 | for(h = 0; h <= dn_rt_hash_mask; h++) { |
1628 | if (h < s_h) |
1629 | continue; |
1630 | if (h > s_h) |
1631 | s_idx = 0; |
1632 | rcu_read_lock_bh(); |
1633 | for(rt = rcu_dereference_bh(dn_rt_hash_table[h].chain), idx = 0; |
1634 | rt; |
1635 | rt = rcu_dereference_bh(rt->dst.dn_next), idx++) { |
1636 | if (idx < s_idx) |
1637 | continue; |
1638 | skb_dst_set(skb, dst_clone(&rt->dst)); |
1639 | if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid, |
1640 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
1641 | 1, NLM_F_MULTI) <= 0) { |
1642 | skb_dst_drop(skb); |
1643 | rcu_read_unlock_bh(); |
1644 | goto done; |
1645 | } |
1646 | skb_dst_drop(skb); |
1647 | } |
1648 | rcu_read_unlock_bh(); |
1649 | } |
1650 | |
1651 | done: |
1652 | cb->args[0] = h; |
1653 | cb->args[1] = idx; |
1654 | return skb->len; |
1655 | } |
1656 | |
1657 | #ifdef CONFIG_PROC_FS |
1658 | struct dn_rt_cache_iter_state { |
1659 | int bucket; |
1660 | }; |
1661 | |
1662 | static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq) |
1663 | { |
1664 | struct dn_route *rt = NULL; |
1665 | struct dn_rt_cache_iter_state *s = seq->private; |
1666 | |
1667 | for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) { |
1668 | rcu_read_lock_bh(); |
1669 | rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); |
1670 | if (rt) |
1671 | break; |
1672 | rcu_read_unlock_bh(); |
1673 | } |
1674 | return rt; |
1675 | } |
1676 | |
1677 | static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt) |
1678 | { |
1679 | struct dn_rt_cache_iter_state *s = seq->private; |
1680 | |
1681 | rt = rt->dst.dn_next; |
1682 | while(!rt) { |
1683 | rcu_read_unlock_bh(); |
1684 | if (--s->bucket < 0) |
1685 | break; |
1686 | rcu_read_lock_bh(); |
1687 | rt = dn_rt_hash_table[s->bucket].chain; |
1688 | } |
1689 | return rcu_dereference_bh(rt); |
1690 | } |
1691 | |
1692 | static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
1693 | { |
1694 | struct dn_route *rt = dn_rt_cache_get_first(seq); |
1695 | |
1696 | if (rt) { |
1697 | while(*pos && (rt = dn_rt_cache_get_next(seq, rt))) |
1698 | --*pos; |
1699 | } |
1700 | return *pos ? NULL : rt; |
1701 | } |
1702 | |
1703 | static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1704 | { |
1705 | struct dn_route *rt = dn_rt_cache_get_next(seq, v); |
1706 | ++*pos; |
1707 | return rt; |
1708 | } |
1709 | |
1710 | static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v) |
1711 | { |
1712 | if (v) |
1713 | rcu_read_unlock_bh(); |
1714 | } |
1715 | |
1716 | static int dn_rt_cache_seq_show(struct seq_file *seq, void *v) |
1717 | { |
1718 | struct dn_route *rt = v; |
1719 | char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN]; |
1720 | |
1721 | seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n", |
1722 | rt->dst.dev ? rt->dst.dev->name : "*", |
1723 | dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1), |
1724 | dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2), |
1725 | atomic_read(&rt->dst.__refcnt), |
1726 | rt->dst.__use, |
1727 | (int) dst_metric(&rt->dst, RTAX_RTT)); |
1728 | return 0; |
1729 | } |
1730 | |
1731 | static const struct seq_operations dn_rt_cache_seq_ops = { |
1732 | .start = dn_rt_cache_seq_start, |
1733 | .next = dn_rt_cache_seq_next, |
1734 | .stop = dn_rt_cache_seq_stop, |
1735 | .show = dn_rt_cache_seq_show, |
1736 | }; |
1737 | |
1738 | static int dn_rt_cache_seq_open(struct inode *inode, struct file *file) |
1739 | { |
1740 | return seq_open_private(file, &dn_rt_cache_seq_ops, |
1741 | sizeof(struct dn_rt_cache_iter_state)); |
1742 | } |
1743 | |
1744 | static const struct file_operations dn_rt_cache_seq_fops = { |
1745 | .owner = THIS_MODULE, |
1746 | .open = dn_rt_cache_seq_open, |
1747 | .read = seq_read, |
1748 | .llseek = seq_lseek, |
1749 | .release = seq_release_private, |
1750 | }; |
1751 | |
1752 | #endif /* CONFIG_PROC_FS */ |
1753 | |
1754 | void __init dn_route_init(void) |
1755 | { |
1756 | int i, goal, order; |
1757 | |
1758 | dn_dst_ops.kmem_cachep = |
1759 | kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0, |
1760 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1761 | setup_timer(&dn_route_timer, dn_dst_check_expire, 0); |
1762 | dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; |
1763 | add_timer(&dn_route_timer); |
1764 | |
1765 | goal = totalram_pages >> (26 - PAGE_SHIFT); |
1766 | |
1767 | for(order = 0; (1UL << order) < goal; order++) |
1768 | /* NOTHING */; |
1769 | |
1770 | /* |
1771 | * Only want 1024 entries max, since the table is very, very unlikely |
1772 | * to be larger than that. |
1773 | */ |
1774 | while(order && ((((1UL << order) * PAGE_SIZE) / |
1775 | sizeof(struct dn_rt_hash_bucket)) >= 2048)) |
1776 | order--; |
1777 | |
1778 | do { |
1779 | dn_rt_hash_mask = (1UL << order) * PAGE_SIZE / |
1780 | sizeof(struct dn_rt_hash_bucket); |
1781 | while(dn_rt_hash_mask & (dn_rt_hash_mask - 1)) |
1782 | dn_rt_hash_mask--; |
1783 | dn_rt_hash_table = (struct dn_rt_hash_bucket *) |
1784 | __get_free_pages(GFP_ATOMIC, order); |
1785 | } while (dn_rt_hash_table == NULL && --order > 0); |
1786 | |
1787 | if (!dn_rt_hash_table) |
1788 | panic("Failed to allocate DECnet route cache hash table\n"); |
1789 | |
1790 | printk(KERN_INFO |
1791 | "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n", |
1792 | dn_rt_hash_mask, |
1793 | (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024); |
1794 | |
1795 | dn_rt_hash_mask--; |
1796 | for(i = 0; i <= dn_rt_hash_mask; i++) { |
1797 | spin_lock_init(&dn_rt_hash_table[i].lock); |
1798 | dn_rt_hash_table[i].chain = NULL; |
1799 | } |
1800 | |
1801 | dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1); |
1802 | |
1803 | proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops); |
1804 | |
1805 | #ifdef CONFIG_DECNET_ROUTER |
1806 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, dn_fib_dump); |
1807 | #else |
1808 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, |
1809 | dn_cache_dump); |
1810 | #endif |
1811 | } |
1812 | |
1813 | void __exit dn_route_cleanup(void) |
1814 | { |
1815 | del_timer(&dn_route_timer); |
1816 | dn_run_flush(0); |
1817 | |
1818 | proc_net_remove(&init_net, "decnet_cache"); |
1819 | } |
1820 | |
1821 |
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