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 | ||
1da177e4 LT |
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 <net/sock.h> | |
70 | #include <linux/mm.h> | |
71 | #include <linux/proc_fs.h> | |
72 | #include <linux/seq_file.h> | |
73 | #include <linux/init.h> | |
74 | #include <linux/rtnetlink.h> | |
75 | #include <linux/string.h> | |
76 | #include <linux/netfilter_decnet.h> | |
77 | #include <linux/rcupdate.h> | |
78 | #include <linux/times.h> | |
79 | #include <asm/errno.h> | |
80 | #include <net/neighbour.h> | |
81 | #include <net/dst.h> | |
82 | #include <net/flow.h> | |
a8731cbf | 83 | #include <net/fib_rules.h> |
1da177e4 LT |
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 | ||
c4ea94ab | 136 | static __inline__ unsigned dn_hash(__le16 src, __le16 dst) |
1da177e4 | 137 | { |
c4ea94ab | 138 | __u16 tmp = (__u16 __force)(src ^ dst); |
1da177e4 LT |
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 | { | |
34001127 | 152 | dst_release(&rt->u.dst); |
1da177e4 LT |
153 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
154 | } | |
155 | ||
156 | static void dn_dst_check_expire(unsigned long dummy) | |
157 | { | |
158 | int i; | |
159 | struct dn_route *rt, **rtp; | |
160 | unsigned long now = jiffies; | |
161 | unsigned long expire = 120 * HZ; | |
162 | ||
163 | for(i = 0; i <= dn_rt_hash_mask; i++) { | |
164 | rtp = &dn_rt_hash_table[i].chain; | |
165 | ||
166 | spin_lock(&dn_rt_hash_table[i].lock); | |
167 | while((rt=*rtp) != NULL) { | |
168 | if (atomic_read(&rt->u.dst.__refcnt) || | |
169 | (now - rt->u.dst.lastuse) < expire) { | |
170 | rtp = &rt->u.rt_next; | |
171 | continue; | |
172 | } | |
173 | *rtp = rt->u.rt_next; | |
174 | rt->u.rt_next = NULL; | |
175 | dnrt_free(rt); | |
176 | } | |
177 | spin_unlock(&dn_rt_hash_table[i].lock); | |
178 | ||
179 | if ((jiffies - now) > 0) | |
180 | break; | |
181 | } | |
182 | ||
183 | mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ); | |
184 | } | |
185 | ||
186 | static int dn_dst_gc(void) | |
187 | { | |
188 | struct dn_route *rt, **rtp; | |
189 | int i; | |
190 | unsigned long now = jiffies; | |
191 | unsigned long expire = 10 * HZ; | |
192 | ||
193 | for(i = 0; i <= dn_rt_hash_mask; i++) { | |
194 | ||
195 | spin_lock_bh(&dn_rt_hash_table[i].lock); | |
196 | rtp = &dn_rt_hash_table[i].chain; | |
197 | ||
198 | while((rt=*rtp) != NULL) { | |
199 | if (atomic_read(&rt->u.dst.__refcnt) || | |
200 | (now - rt->u.dst.lastuse) < expire) { | |
201 | rtp = &rt->u.rt_next; | |
202 | continue; | |
203 | } | |
204 | *rtp = rt->u.rt_next; | |
205 | rt->u.rt_next = NULL; | |
206 | dnrt_drop(rt); | |
207 | break; | |
208 | } | |
209 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
210 | } | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | /* | |
216 | * The decnet standards don't impose a particular minimum mtu, what they | |
217 | * do insist on is that the routing layer accepts a datagram of at least | |
218 | * 230 bytes long. Here we have to subtract the routing header length from | |
219 | * 230 to get the minimum acceptable mtu. If there is no neighbour, then we | |
220 | * assume the worst and use a long header size. | |
221 | * | |
222 | * We update both the mtu and the advertised mss (i.e. the segment size we | |
223 | * advertise to the other end). | |
224 | */ | |
225 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu) | |
226 | { | |
227 | u32 min_mtu = 230; | |
228 | struct dn_dev *dn = dst->neighbour ? | |
229 | (struct dn_dev *)dst->neighbour->dev->dn_ptr : NULL; | |
230 | ||
231 | if (dn && dn->use_long == 0) | |
232 | min_mtu -= 6; | |
233 | else | |
234 | min_mtu -= 21; | |
235 | ||
236 | if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= min_mtu) { | |
237 | if (!(dst_metric_locked(dst, RTAX_MTU))) { | |
238 | dst->metrics[RTAX_MTU-1] = mtu; | |
239 | dst_set_expires(dst, dn_rt_mtu_expires); | |
240 | } | |
241 | if (!(dst_metric_locked(dst, RTAX_ADVMSS))) { | |
242 | u32 mss = mtu - DN_MAX_NSP_DATA_HEADER; | |
243 | if (dst->metrics[RTAX_ADVMSS-1] > mss) | |
244 | dst->metrics[RTAX_ADVMSS-1] = mss; | |
245 | } | |
246 | } | |
247 | } | |
248 | ||
249 | /* | |
250 | * When a route has been marked obsolete. (e.g. routing cache flush) | |
251 | */ | |
252 | static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie) | |
253 | { | |
254 | return NULL; | |
255 | } | |
256 | ||
257 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst) | |
258 | { | |
259 | dst_release(dst); | |
260 | return NULL; | |
261 | } | |
262 | ||
263 | static void dn_dst_link_failure(struct sk_buff *skb) | |
264 | { | |
265 | return; | |
266 | } | |
267 | ||
268 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) | |
269 | { | |
8238b218 DM |
270 | return ((fl1->nl_u.dn_u.daddr ^ fl2->nl_u.dn_u.daddr) | |
271 | (fl1->nl_u.dn_u.saddr ^ fl2->nl_u.dn_u.saddr) | | |
be60358e | 272 | #ifdef CONFIG_DECNET_ROUTE_FWMARK |
8238b218 DM |
273 | (fl1->nl_u.dn_u.fwmark ^ fl2->nl_u.dn_u.fwmark) | |
274 | #endif | |
275 | (fl1->nl_u.dn_u.scope ^ fl2->nl_u.dn_u.scope) | | |
276 | (fl1->oif ^ fl2->oif) | | |
277 | (fl1->iif ^ fl2->iif)) == 0; | |
1da177e4 LT |
278 | } |
279 | ||
280 | static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp) | |
281 | { | |
282 | struct dn_route *rth, **rthp; | |
283 | unsigned long now = jiffies; | |
284 | ||
285 | rthp = &dn_rt_hash_table[hash].chain; | |
286 | ||
287 | spin_lock_bh(&dn_rt_hash_table[hash].lock); | |
288 | while((rth = *rthp) != NULL) { | |
289 | if (compare_keys(&rth->fl, &rt->fl)) { | |
290 | /* Put it first */ | |
291 | *rthp = rth->u.rt_next; | |
292 | rcu_assign_pointer(rth->u.rt_next, | |
293 | dn_rt_hash_table[hash].chain); | |
294 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth); | |
295 | ||
296 | rth->u.dst.__use++; | |
297 | dst_hold(&rth->u.dst); | |
298 | rth->u.dst.lastuse = now; | |
299 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); | |
300 | ||
301 | dnrt_drop(rt); | |
302 | *rp = rth; | |
303 | return 0; | |
304 | } | |
305 | rthp = &rth->u.rt_next; | |
306 | } | |
307 | ||
308 | rcu_assign_pointer(rt->u.rt_next, dn_rt_hash_table[hash].chain); | |
309 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt); | |
310 | ||
311 | dst_hold(&rt->u.dst); | |
312 | rt->u.dst.__use++; | |
313 | rt->u.dst.lastuse = now; | |
314 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); | |
315 | *rp = rt; | |
316 | return 0; | |
317 | } | |
318 | ||
319 | void dn_run_flush(unsigned long dummy) | |
320 | { | |
321 | int i; | |
322 | struct dn_route *rt, *next; | |
323 | ||
324 | for(i = 0; i < dn_rt_hash_mask; i++) { | |
325 | spin_lock_bh(&dn_rt_hash_table[i].lock); | |
326 | ||
327 | if ((rt = xchg(&dn_rt_hash_table[i].chain, NULL)) == NULL) | |
328 | goto nothing_to_declare; | |
329 | ||
330 | for(; rt; rt=next) { | |
331 | next = rt->u.rt_next; | |
332 | rt->u.rt_next = NULL; | |
333 | dst_free((struct dst_entry *)rt); | |
334 | } | |
335 | ||
336 | nothing_to_declare: | |
337 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
338 | } | |
339 | } | |
340 | ||
341 | static DEFINE_SPINLOCK(dn_rt_flush_lock); | |
342 | ||
343 | void dn_rt_cache_flush(int delay) | |
344 | { | |
345 | unsigned long now = jiffies; | |
346 | int user_mode = !in_interrupt(); | |
347 | ||
348 | if (delay < 0) | |
349 | delay = dn_rt_min_delay; | |
350 | ||
351 | spin_lock_bh(&dn_rt_flush_lock); | |
352 | ||
353 | if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) { | |
354 | long tmo = (long)(dn_rt_deadline - now); | |
355 | ||
356 | if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay) | |
357 | tmo = 0; | |
358 | ||
359 | if (delay > tmo) | |
360 | delay = tmo; | |
361 | } | |
362 | ||
363 | if (delay <= 0) { | |
364 | spin_unlock_bh(&dn_rt_flush_lock); | |
365 | dn_run_flush(0); | |
366 | return; | |
367 | } | |
368 | ||
369 | if (dn_rt_deadline == 0) | |
370 | dn_rt_deadline = now + dn_rt_max_delay; | |
371 | ||
372 | dn_rt_flush_timer.expires = now + delay; | |
373 | add_timer(&dn_rt_flush_timer); | |
374 | spin_unlock_bh(&dn_rt_flush_lock); | |
375 | } | |
376 | ||
377 | /** | |
378 | * dn_return_short - Return a short packet to its sender | |
379 | * @skb: The packet to return | |
380 | * | |
381 | */ | |
382 | static int dn_return_short(struct sk_buff *skb) | |
383 | { | |
384 | struct dn_skb_cb *cb; | |
385 | unsigned char *ptr; | |
c4ea94ab SW |
386 | __le16 *src; |
387 | __le16 *dst; | |
388 | __le16 tmp; | |
1da177e4 LT |
389 | |
390 | /* Add back headers */ | |
391 | skb_push(skb, skb->data - skb->nh.raw); | |
392 | ||
393 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) | |
394 | return NET_RX_DROP; | |
395 | ||
396 | cb = DN_SKB_CB(skb); | |
397 | /* Skip packet length and point to flags */ | |
398 | ptr = skb->data + 2; | |
399 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; | |
400 | ||
c4ea94ab | 401 | dst = (__le16 *)ptr; |
1da177e4 | 402 | ptr += 2; |
c4ea94ab | 403 | src = (__le16 *)ptr; |
1da177e4 LT |
404 | ptr += 2; |
405 | *ptr = 0; /* Zero hop count */ | |
406 | ||
407 | /* Swap source and destination */ | |
408 | tmp = *src; | |
409 | *src = *dst; | |
410 | *dst = tmp; | |
411 | ||
412 | skb->pkt_type = PACKET_OUTGOING; | |
413 | dn_rt_finish_output(skb, NULL, NULL); | |
414 | return NET_RX_SUCCESS; | |
415 | } | |
416 | ||
417 | /** | |
418 | * dn_return_long - Return a long packet to its sender | |
419 | * @skb: The long format packet to return | |
420 | * | |
421 | */ | |
422 | static int dn_return_long(struct sk_buff *skb) | |
423 | { | |
424 | struct dn_skb_cb *cb; | |
425 | unsigned char *ptr; | |
426 | unsigned char *src_addr, *dst_addr; | |
427 | unsigned char tmp[ETH_ALEN]; | |
428 | ||
429 | /* Add back all headers */ | |
430 | skb_push(skb, skb->data - skb->nh.raw); | |
431 | ||
432 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) | |
433 | return NET_RX_DROP; | |
434 | ||
435 | cb = DN_SKB_CB(skb); | |
436 | /* Ignore packet length and point to flags */ | |
437 | ptr = skb->data + 2; | |
438 | ||
439 | /* Skip padding */ | |
440 | if (*ptr & DN_RT_F_PF) { | |
441 | char padlen = (*ptr & ~DN_RT_F_PF); | |
442 | ptr += padlen; | |
443 | } | |
444 | ||
445 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; | |
446 | ptr += 2; | |
447 | dst_addr = ptr; | |
448 | ptr += 8; | |
449 | src_addr = ptr; | |
450 | ptr += 6; | |
451 | *ptr = 0; /* Zero hop count */ | |
452 | ||
453 | /* Swap source and destination */ | |
454 | memcpy(tmp, src_addr, ETH_ALEN); | |
455 | memcpy(src_addr, dst_addr, ETH_ALEN); | |
456 | memcpy(dst_addr, tmp, ETH_ALEN); | |
457 | ||
458 | skb->pkt_type = PACKET_OUTGOING; | |
459 | dn_rt_finish_output(skb, dst_addr, src_addr); | |
460 | return NET_RX_SUCCESS; | |
461 | } | |
462 | ||
463 | /** | |
464 | * dn_route_rx_packet - Try and find a route for an incoming packet | |
465 | * @skb: The packet to find a route for | |
466 | * | |
467 | * Returns: result of input function if route is found, error code otherwise | |
468 | */ | |
469 | static int dn_route_rx_packet(struct sk_buff *skb) | |
470 | { | |
471 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
472 | int err; | |
473 | ||
474 | if ((err = dn_route_input(skb)) == 0) | |
475 | return dst_input(skb); | |
476 | ||
477 | if (decnet_debug_level & 4) { | |
478 | char *devname = skb->dev ? skb->dev->name : "???"; | |
479 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
480 | printk(KERN_DEBUG | |
481 | "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n", | |
c4ea94ab SW |
482 | (int)cb->rt_flags, devname, skb->len, |
483 | dn_ntohs(cb->src), dn_ntohs(cb->dst), | |
1da177e4 LT |
484 | err, skb->pkt_type); |
485 | } | |
486 | ||
487 | if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) { | |
488 | switch(cb->rt_flags & DN_RT_PKT_MSK) { | |
489 | case DN_RT_PKT_SHORT: | |
490 | return dn_return_short(skb); | |
491 | case DN_RT_PKT_LONG: | |
492 | return dn_return_long(skb); | |
493 | } | |
494 | } | |
495 | ||
496 | kfree_skb(skb); | |
497 | return NET_RX_DROP; | |
498 | } | |
499 | ||
500 | static int dn_route_rx_long(struct sk_buff *skb) | |
501 | { | |
502 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
503 | unsigned char *ptr = skb->data; | |
504 | ||
505 | if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */ | |
506 | goto drop_it; | |
507 | ||
508 | skb_pull(skb, 20); | |
509 | skb->h.raw = skb->data; | |
510 | ||
511 | /* Destination info */ | |
512 | ptr += 2; | |
c4ea94ab | 513 | cb->dst = dn_eth2dn(ptr); |
1da177e4 LT |
514 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
515 | goto drop_it; | |
516 | ptr += 6; | |
517 | ||
518 | ||
519 | /* Source info */ | |
520 | ptr += 2; | |
c4ea94ab | 521 | cb->src = dn_eth2dn(ptr); |
1da177e4 LT |
522 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
523 | goto drop_it; | |
524 | ptr += 6; | |
525 | /* Other junk */ | |
526 | ptr++; | |
527 | cb->hops = *ptr++; /* Visit Count */ | |
528 | ||
529 | return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet); | |
530 | ||
531 | drop_it: | |
532 | kfree_skb(skb); | |
533 | return NET_RX_DROP; | |
534 | } | |
535 | ||
536 | ||
537 | ||
538 | static int dn_route_rx_short(struct sk_buff *skb) | |
539 | { | |
540 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
541 | unsigned char *ptr = skb->data; | |
542 | ||
543 | if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */ | |
544 | goto drop_it; | |
545 | ||
546 | skb_pull(skb, 5); | |
547 | skb->h.raw = skb->data; | |
548 | ||
c4ea94ab | 549 | cb->dst = *(__le16 *)ptr; |
1da177e4 | 550 | ptr += 2; |
c4ea94ab | 551 | cb->src = *(__le16 *)ptr; |
1da177e4 LT |
552 | ptr += 2; |
553 | cb->hops = *ptr & 0x3f; | |
554 | ||
555 | return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet); | |
556 | ||
557 | drop_it: | |
558 | kfree_skb(skb); | |
559 | return NET_RX_DROP; | |
560 | } | |
561 | ||
562 | static int dn_route_discard(struct sk_buff *skb) | |
563 | { | |
564 | /* | |
565 | * I know we drop the packet here, but thats considered success in | |
566 | * this case | |
567 | */ | |
568 | kfree_skb(skb); | |
569 | return NET_RX_SUCCESS; | |
570 | } | |
571 | ||
572 | static int dn_route_ptp_hello(struct sk_buff *skb) | |
573 | { | |
574 | dn_dev_hello(skb); | |
575 | dn_neigh_pointopoint_hello(skb); | |
576 | return NET_RX_SUCCESS; | |
577 | } | |
578 | ||
f2ccd8fa | 579 | int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
580 | { |
581 | struct dn_skb_cb *cb; | |
582 | unsigned char flags = 0; | |
c4ea94ab | 583 | __u16 len = dn_ntohs(*(__le16 *)skb->data); |
1da177e4 LT |
584 | struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr; |
585 | unsigned char padlen = 0; | |
586 | ||
587 | if (dn == NULL) | |
588 | goto dump_it; | |
589 | ||
590 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
591 | goto out; | |
592 | ||
593 | if (!pskb_may_pull(skb, 3)) | |
594 | goto dump_it; | |
595 | ||
596 | skb_pull(skb, 2); | |
597 | ||
598 | if (len > skb->len) | |
599 | goto dump_it; | |
600 | ||
601 | skb_trim(skb, len); | |
602 | ||
603 | flags = *skb->data; | |
604 | ||
605 | cb = DN_SKB_CB(skb); | |
606 | cb->stamp = jiffies; | |
607 | cb->iif = dev->ifindex; | |
608 | ||
609 | /* | |
610 | * If we have padding, remove it. | |
611 | */ | |
612 | if (flags & DN_RT_F_PF) { | |
613 | padlen = flags & ~DN_RT_F_PF; | |
614 | if (!pskb_may_pull(skb, padlen + 1)) | |
615 | goto dump_it; | |
616 | skb_pull(skb, padlen); | |
617 | flags = *skb->data; | |
618 | } | |
619 | ||
620 | skb->nh.raw = skb->data; | |
621 | ||
622 | /* | |
623 | * Weed out future version DECnet | |
624 | */ | |
625 | if (flags & DN_RT_F_VER) | |
626 | goto dump_it; | |
627 | ||
628 | cb->rt_flags = flags; | |
629 | ||
630 | if (decnet_debug_level & 1) | |
631 | printk(KERN_DEBUG | |
632 | "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n", | |
633 | (int)flags, (dev) ? dev->name : "???", len, skb->len, | |
634 | padlen); | |
635 | ||
636 | if (flags & DN_RT_PKT_CNTL) { | |
364c6bad | 637 | if (unlikely(skb_linearize(skb))) |
1da177e4 LT |
638 | goto dump_it; |
639 | ||
640 | switch(flags & DN_RT_CNTL_MSK) { | |
641 | case DN_RT_PKT_INIT: | |
642 | dn_dev_init_pkt(skb); | |
643 | break; | |
644 | case DN_RT_PKT_VERI: | |
645 | dn_dev_veri_pkt(skb); | |
646 | break; | |
647 | } | |
648 | ||
649 | if (dn->parms.state != DN_DEV_S_RU) | |
650 | goto dump_it; | |
651 | ||
652 | switch(flags & DN_RT_CNTL_MSK) { | |
653 | case DN_RT_PKT_HELO: | |
654 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_route_ptp_hello); | |
655 | ||
656 | case DN_RT_PKT_L1RT: | |
657 | case DN_RT_PKT_L2RT: | |
658 | return NF_HOOK(PF_DECnet, NF_DN_ROUTE, skb, skb->dev, NULL, dn_route_discard); | |
659 | case DN_RT_PKT_ERTH: | |
660 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_router_hello); | |
661 | ||
662 | case DN_RT_PKT_EEDH: | |
663 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_endnode_hello); | |
664 | } | |
665 | } else { | |
666 | if (dn->parms.state != DN_DEV_S_RU) | |
667 | goto dump_it; | |
668 | ||
669 | skb_pull(skb, 1); /* Pull flags */ | |
670 | ||
671 | switch(flags & DN_RT_PKT_MSK) { | |
672 | case DN_RT_PKT_LONG: | |
673 | return dn_route_rx_long(skb); | |
674 | case DN_RT_PKT_SHORT: | |
675 | return dn_route_rx_short(skb); | |
676 | } | |
677 | } | |
678 | ||
679 | dump_it: | |
680 | kfree_skb(skb); | |
681 | out: | |
682 | return NET_RX_DROP; | |
683 | } | |
684 | ||
685 | static int dn_output(struct sk_buff *skb) | |
686 | { | |
687 | struct dst_entry *dst = skb->dst; | |
688 | struct dn_route *rt = (struct dn_route *)dst; | |
689 | struct net_device *dev = dst->dev; | |
690 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
691 | struct neighbour *neigh; | |
692 | ||
693 | int err = -EINVAL; | |
694 | ||
695 | if ((neigh = dst->neighbour) == NULL) | |
696 | goto error; | |
697 | ||
698 | skb->dev = dev; | |
699 | ||
700 | cb->src = rt->rt_saddr; | |
701 | cb->dst = rt->rt_daddr; | |
702 | ||
703 | /* | |
704 | * Always set the Intra-Ethernet bit on all outgoing packets | |
705 | * originated on this node. Only valid flag from upper layers | |
706 | * is return-to-sender-requested. Set hop count to 0 too. | |
707 | */ | |
708 | cb->rt_flags &= ~DN_RT_F_RQR; | |
709 | cb->rt_flags |= DN_RT_F_IE; | |
710 | cb->hops = 0; | |
711 | ||
712 | return NF_HOOK(PF_DECnet, NF_DN_LOCAL_OUT, skb, NULL, dev, neigh->output); | |
713 | ||
714 | error: | |
715 | if (net_ratelimit()) | |
716 | printk(KERN_DEBUG "dn_output: This should not happen\n"); | |
717 | ||
718 | kfree_skb(skb); | |
719 | ||
720 | return err; | |
721 | } | |
722 | ||
723 | static int dn_forward(struct sk_buff *skb) | |
724 | { | |
725 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
726 | struct dst_entry *dst = skb->dst; | |
727 | struct dn_dev *dn_db = dst->dev->dn_ptr; | |
728 | struct dn_route *rt; | |
729 | struct neighbour *neigh = dst->neighbour; | |
730 | int header_len; | |
731 | #ifdef CONFIG_NETFILTER | |
732 | struct net_device *dev = skb->dev; | |
733 | #endif | |
734 | ||
735 | if (skb->pkt_type != PACKET_HOST) | |
736 | goto drop; | |
737 | ||
738 | /* Ensure that we have enough space for headers */ | |
739 | rt = (struct dn_route *)skb->dst; | |
740 | header_len = dn_db->use_long ? 21 : 6; | |
741 | if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+header_len)) | |
742 | goto drop; | |
743 | ||
744 | /* | |
745 | * Hop count exceeded. | |
746 | */ | |
747 | if (++cb->hops > 30) | |
748 | goto drop; | |
749 | ||
750 | skb->dev = rt->u.dst.dev; | |
751 | ||
752 | /* | |
753 | * If packet goes out same interface it came in on, then set | |
754 | * the Intra-Ethernet bit. This has no effect for short | |
755 | * packets, so we don't need to test for them here. | |
756 | */ | |
757 | cb->rt_flags &= ~DN_RT_F_IE; | |
758 | if (rt->rt_flags & RTCF_DOREDIRECT) | |
759 | cb->rt_flags |= DN_RT_F_IE; | |
760 | ||
761 | return NF_HOOK(PF_DECnet, NF_DN_FORWARD, skb, dev, skb->dev, neigh->output); | |
762 | ||
763 | drop: | |
764 | kfree_skb(skb); | |
765 | return NET_RX_DROP; | |
766 | } | |
767 | ||
768 | /* | |
769 | * Drop packet. This is used for endnodes and for | |
770 | * when we should not be forwarding packets from | |
771 | * this dest. | |
772 | */ | |
773 | static int dn_blackhole(struct sk_buff *skb) | |
774 | { | |
775 | kfree_skb(skb); | |
776 | return NET_RX_DROP; | |
777 | } | |
778 | ||
779 | /* | |
780 | * Used to catch bugs. This should never normally get | |
781 | * called. | |
782 | */ | |
783 | static int dn_rt_bug(struct sk_buff *skb) | |
784 | { | |
785 | if (net_ratelimit()) { | |
786 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
787 | ||
788 | printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n", | |
c4ea94ab | 789 | dn_ntohs(cb->src), dn_ntohs(cb->dst)); |
1da177e4 LT |
790 | } |
791 | ||
792 | kfree_skb(skb); | |
793 | ||
794 | return NET_RX_BAD; | |
795 | } | |
796 | ||
797 | static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res) | |
798 | { | |
799 | struct dn_fib_info *fi = res->fi; | |
800 | struct net_device *dev = rt->u.dst.dev; | |
801 | struct neighbour *n; | |
802 | unsigned mss; | |
803 | ||
804 | if (fi) { | |
805 | if (DN_FIB_RES_GW(*res) && | |
806 | DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
807 | rt->rt_gateway = DN_FIB_RES_GW(*res); | |
808 | memcpy(rt->u.dst.metrics, fi->fib_metrics, | |
809 | sizeof(rt->u.dst.metrics)); | |
810 | } | |
811 | rt->rt_type = res->type; | |
812 | ||
813 | if (dev != NULL && rt->u.dst.neighbour == NULL) { | |
814 | n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev); | |
815 | if (IS_ERR(n)) | |
816 | return PTR_ERR(n); | |
817 | rt->u.dst.neighbour = n; | |
818 | } | |
819 | ||
820 | if (rt->u.dst.metrics[RTAX_MTU-1] == 0 || | |
821 | rt->u.dst.metrics[RTAX_MTU-1] > rt->u.dst.dev->mtu) | |
822 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; | |
823 | mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->u.dst)); | |
824 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0 || | |
825 | rt->u.dst.metrics[RTAX_ADVMSS-1] > mss) | |
826 | rt->u.dst.metrics[RTAX_ADVMSS-1] = mss; | |
827 | return 0; | |
828 | } | |
829 | ||
c4ea94ab | 830 | static inline int dn_match_addr(__le16 addr1, __le16 addr2) |
1da177e4 LT |
831 | { |
832 | __u16 tmp = dn_ntohs(addr1) ^ dn_ntohs(addr2); | |
833 | int match = 16; | |
834 | while(tmp) { | |
835 | tmp >>= 1; | |
836 | match--; | |
837 | } | |
838 | return match; | |
839 | } | |
840 | ||
c4ea94ab | 841 | static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope) |
1da177e4 | 842 | { |
c4ea94ab | 843 | __le16 saddr = 0; |
1da177e4 LT |
844 | struct dn_dev *dn_db = dev->dn_ptr; |
845 | struct dn_ifaddr *ifa; | |
846 | int best_match = 0; | |
847 | int ret; | |
848 | ||
849 | read_lock(&dev_base_lock); | |
850 | for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) { | |
851 | if (ifa->ifa_scope > scope) | |
852 | continue; | |
853 | if (!daddr) { | |
854 | saddr = ifa->ifa_local; | |
855 | break; | |
856 | } | |
857 | ret = dn_match_addr(daddr, ifa->ifa_local); | |
858 | if (ret > best_match) | |
859 | saddr = ifa->ifa_local; | |
860 | if (best_match == 0) | |
861 | saddr = ifa->ifa_local; | |
862 | } | |
863 | read_unlock(&dev_base_lock); | |
864 | ||
865 | return saddr; | |
866 | } | |
867 | ||
c4ea94ab | 868 | static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res) |
1da177e4 LT |
869 | { |
870 | return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope); | |
871 | } | |
872 | ||
c4ea94ab | 873 | static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res) |
1da177e4 | 874 | { |
c4ea94ab | 875 | __le16 mask = dnet_make_mask(res->prefixlen); |
1da177e4 LT |
876 | return (daddr&~mask)|res->fi->fib_nh->nh_gw; |
877 | } | |
878 | ||
879 | static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard) | |
880 | { | |
881 | struct flowi fl = { .nl_u = { .dn_u = | |
882 | { .daddr = oldflp->fld_dst, | |
883 | .saddr = oldflp->fld_src, | |
884 | .scope = RT_SCOPE_UNIVERSE, | |
885 | #ifdef CONFIG_DECNET_ROUTE_FWMARK | |
886 | .fwmark = oldflp->fld_fwmark | |
887 | #endif | |
888 | } }, | |
889 | .iif = loopback_dev.ifindex, | |
890 | .oif = oldflp->oif }; | |
891 | struct dn_route *rt = NULL; | |
892 | struct net_device *dev_out = NULL; | |
893 | struct neighbour *neigh = NULL; | |
894 | unsigned hash; | |
895 | unsigned flags = 0; | |
896 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST }; | |
897 | int err; | |
898 | int free_res = 0; | |
c4ea94ab | 899 | __le16 gateway = 0; |
1da177e4 LT |
900 | |
901 | if (decnet_debug_level & 16) | |
902 | printk(KERN_DEBUG | |
903 | "dn_route_output_slow: dst=%04x src=%04x mark=%d" | |
c4ea94ab SW |
904 | " iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst), |
905 | dn_ntohs(oldflp->fld_src), | |
1da177e4 LT |
906 | oldflp->fld_fwmark, loopback_dev.ifindex, oldflp->oif); |
907 | ||
908 | /* If we have an output interface, verify its a DECnet device */ | |
909 | if (oldflp->oif) { | |
910 | dev_out = dev_get_by_index(oldflp->oif); | |
911 | err = -ENODEV; | |
912 | if (dev_out && dev_out->dn_ptr == NULL) { | |
913 | dev_put(dev_out); | |
914 | dev_out = NULL; | |
915 | } | |
916 | if (dev_out == NULL) | |
917 | goto out; | |
918 | } | |
919 | ||
920 | /* If we have a source address, verify that its a local address */ | |
921 | if (oldflp->fld_src) { | |
922 | err = -EADDRNOTAVAIL; | |
923 | ||
924 | if (dev_out) { | |
925 | if (dn_dev_islocal(dev_out, oldflp->fld_src)) | |
926 | goto source_ok; | |
927 | dev_put(dev_out); | |
928 | goto out; | |
929 | } | |
930 | read_lock(&dev_base_lock); | |
931 | for(dev_out = dev_base; dev_out; dev_out = dev_out->next) { | |
932 | if (!dev_out->dn_ptr) | |
933 | continue; | |
9bbf28a1 PC |
934 | if (!dn_dev_islocal(dev_out, oldflp->fld_src)) |
935 | continue; | |
936 | if ((dev_out->flags & IFF_LOOPBACK) && | |
937 | oldflp->fld_dst && | |
938 | !dn_dev_islocal(dev_out, oldflp->fld_dst)) | |
939 | continue; | |
940 | break; | |
1da177e4 LT |
941 | } |
942 | read_unlock(&dev_base_lock); | |
943 | if (dev_out == NULL) | |
944 | goto out; | |
945 | dev_hold(dev_out); | |
946 | source_ok: | |
947 | ; | |
948 | } | |
949 | ||
950 | /* No destination? Assume its local */ | |
951 | if (!fl.fld_dst) { | |
952 | fl.fld_dst = fl.fld_src; | |
953 | ||
954 | err = -EADDRNOTAVAIL; | |
955 | if (dev_out) | |
956 | dev_put(dev_out); | |
957 | dev_out = &loopback_dev; | |
958 | dev_hold(dev_out); | |
959 | if (!fl.fld_dst) { | |
960 | fl.fld_dst = | |
961 | fl.fld_src = dnet_select_source(dev_out, 0, | |
962 | RT_SCOPE_HOST); | |
963 | if (!fl.fld_dst) | |
964 | goto out; | |
965 | } | |
966 | fl.oif = loopback_dev.ifindex; | |
967 | res.type = RTN_LOCAL; | |
968 | goto make_route; | |
969 | } | |
970 | ||
971 | if (decnet_debug_level & 16) | |
972 | printk(KERN_DEBUG | |
973 | "dn_route_output_slow: initial checks complete." | |
c4ea94ab SW |
974 | " dst=%o4x src=%04x oif=%d try_hard=%d\n", |
975 | dn_ntohs(fl.fld_dst), dn_ntohs(fl.fld_src), | |
976 | fl.oif, try_hard); | |
1da177e4 LT |
977 | |
978 | /* | |
979 | * N.B. If the kernel is compiled without router support then | |
980 | * dn_fib_lookup() will evaluate to non-zero so this if () block | |
981 | * will always be executed. | |
982 | */ | |
983 | err = -ESRCH; | |
984 | if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) { | |
985 | struct dn_dev *dn_db; | |
986 | if (err != -ESRCH) | |
987 | goto out; | |
988 | /* | |
989 | * Here the fallback is basically the standard algorithm for | |
990 | * routing in endnodes which is described in the DECnet routing | |
991 | * docs | |
992 | * | |
993 | * If we are not trying hard, look in neighbour cache. | |
994 | * The result is tested to ensure that if a specific output | |
995 | * device/source address was requested, then we honour that | |
996 | * here | |
997 | */ | |
998 | if (!try_hard) { | |
999 | neigh = neigh_lookup_nodev(&dn_neigh_table, &fl.fld_dst); | |
1000 | if (neigh) { | |
1001 | if ((oldflp->oif && | |
1002 | (neigh->dev->ifindex != oldflp->oif)) || | |
1003 | (oldflp->fld_src && | |
1004 | (!dn_dev_islocal(neigh->dev, | |
1005 | oldflp->fld_src)))) { | |
1006 | neigh_release(neigh); | |
1007 | neigh = NULL; | |
1008 | } else { | |
1009 | if (dev_out) | |
1010 | dev_put(dev_out); | |
1011 | if (dn_dev_islocal(neigh->dev, fl.fld_dst)) { | |
1012 | dev_out = &loopback_dev; | |
1013 | res.type = RTN_LOCAL; | |
1014 | } else { | |
1015 | dev_out = neigh->dev; | |
1016 | } | |
1017 | dev_hold(dev_out); | |
1018 | goto select_source; | |
1019 | } | |
1020 | } | |
1021 | } | |
1022 | ||
1023 | /* Not there? Perhaps its a local address */ | |
1024 | if (dev_out == NULL) | |
1025 | dev_out = dn_dev_get_default(); | |
1026 | err = -ENODEV; | |
1027 | if (dev_out == NULL) | |
1028 | goto out; | |
1029 | dn_db = dev_out->dn_ptr; | |
1030 | /* Possible improvement - check all devices for local addr */ | |
1031 | if (dn_dev_islocal(dev_out, fl.fld_dst)) { | |
1032 | dev_put(dev_out); | |
1033 | dev_out = &loopback_dev; | |
1034 | dev_hold(dev_out); | |
1035 | res.type = RTN_LOCAL; | |
1036 | goto select_source; | |
1037 | } | |
1038 | /* Not local either.... try sending it to the default router */ | |
1039 | neigh = neigh_clone(dn_db->router); | |
1040 | BUG_ON(neigh && neigh->dev != dev_out); | |
1041 | ||
1042 | /* Ok then, we assume its directly connected and move on */ | |
1043 | select_source: | |
1044 | if (neigh) | |
1045 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1046 | if (gateway == 0) | |
1047 | gateway = fl.fld_dst; | |
1048 | if (fl.fld_src == 0) { | |
1049 | fl.fld_src = dnet_select_source(dev_out, gateway, | |
1050 | res.type == RTN_LOCAL ? | |
1051 | RT_SCOPE_HOST : | |
1052 | RT_SCOPE_LINK); | |
1053 | if (fl.fld_src == 0 && res.type != RTN_LOCAL) | |
1054 | goto e_addr; | |
1055 | } | |
1056 | fl.oif = dev_out->ifindex; | |
1057 | goto make_route; | |
1058 | } | |
1059 | free_res = 1; | |
1060 | ||
1061 | if (res.type == RTN_NAT) | |
1062 | goto e_inval; | |
1063 | ||
1064 | if (res.type == RTN_LOCAL) { | |
1065 | if (!fl.fld_src) | |
1066 | fl.fld_src = fl.fld_dst; | |
1067 | if (dev_out) | |
1068 | dev_put(dev_out); | |
1069 | dev_out = &loopback_dev; | |
1070 | dev_hold(dev_out); | |
1071 | fl.oif = dev_out->ifindex; | |
1072 | if (res.fi) | |
1073 | dn_fib_info_put(res.fi); | |
1074 | res.fi = NULL; | |
1075 | goto make_route; | |
1076 | } | |
1077 | ||
1078 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
1079 | dn_fib_select_multipath(&fl, &res); | |
1080 | ||
1081 | /* | |
1082 | * We could add some logic to deal with default routes here and | |
1083 | * get rid of some of the special casing above. | |
1084 | */ | |
1085 | ||
1086 | if (!fl.fld_src) | |
1087 | fl.fld_src = DN_FIB_RES_PREFSRC(res); | |
1088 | ||
1089 | if (dev_out) | |
1090 | dev_put(dev_out); | |
1091 | dev_out = DN_FIB_RES_DEV(res); | |
1092 | dev_hold(dev_out); | |
1093 | fl.oif = dev_out->ifindex; | |
1094 | gateway = DN_FIB_RES_GW(res); | |
1095 | ||
1096 | make_route: | |
1097 | if (dev_out->flags & IFF_LOOPBACK) | |
1098 | flags |= RTCF_LOCAL; | |
1099 | ||
1100 | rt = dst_alloc(&dn_dst_ops); | |
1101 | if (rt == NULL) | |
1102 | goto e_nobufs; | |
1103 | ||
1104 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1105 | rt->u.dst.flags = DST_HOST; | |
1106 | ||
1107 | rt->fl.fld_src = oldflp->fld_src; | |
1108 | rt->fl.fld_dst = oldflp->fld_dst; | |
1109 | rt->fl.oif = oldflp->oif; | |
1110 | rt->fl.iif = 0; | |
1111 | #ifdef CONFIG_DECNET_ROUTE_FWMARK | |
1112 | rt->fl.fld_fwmark = oldflp->fld_fwmark; | |
1113 | #endif | |
1114 | ||
1115 | rt->rt_saddr = fl.fld_src; | |
1116 | rt->rt_daddr = fl.fld_dst; | |
1117 | rt->rt_gateway = gateway ? gateway : fl.fld_dst; | |
1118 | rt->rt_local_src = fl.fld_src; | |
1119 | ||
1120 | rt->rt_dst_map = fl.fld_dst; | |
1121 | rt->rt_src_map = fl.fld_src; | |
1122 | ||
1123 | rt->u.dst.dev = dev_out; | |
1124 | dev_hold(dev_out); | |
1125 | rt->u.dst.neighbour = neigh; | |
1126 | neigh = NULL; | |
1127 | ||
1128 | rt->u.dst.lastuse = jiffies; | |
1129 | rt->u.dst.output = dn_output; | |
1130 | rt->u.dst.input = dn_rt_bug; | |
1131 | rt->rt_flags = flags; | |
1132 | if (flags & RTCF_LOCAL) | |
1133 | rt->u.dst.input = dn_nsp_rx; | |
1134 | ||
1135 | err = dn_rt_set_next_hop(rt, &res); | |
1136 | if (err) | |
1137 | goto e_neighbour; | |
1138 | ||
1139 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); | |
1140 | dn_insert_route(rt, hash, (struct dn_route **)pprt); | |
1141 | ||
1142 | done: | |
1143 | if (neigh) | |
1144 | neigh_release(neigh); | |
1145 | if (free_res) | |
1146 | dn_fib_res_put(&res); | |
1147 | if (dev_out) | |
1148 | dev_put(dev_out); | |
1149 | out: | |
1150 | return err; | |
1151 | ||
1152 | e_addr: | |
1153 | err = -EADDRNOTAVAIL; | |
1154 | goto done; | |
1155 | e_inval: | |
1156 | err = -EINVAL; | |
1157 | goto done; | |
1158 | e_nobufs: | |
1159 | err = -ENOBUFS; | |
1160 | goto done; | |
1161 | e_neighbour: | |
1162 | dst_free(&rt->u.dst); | |
1163 | goto e_nobufs; | |
1164 | } | |
1165 | ||
1166 | ||
1167 | /* | |
1168 | * N.B. The flags may be moved into the flowi at some future stage. | |
1169 | */ | |
1170 | static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags) | |
1171 | { | |
1172 | unsigned hash = dn_hash(flp->fld_src, flp->fld_dst); | |
1173 | struct dn_route *rt = NULL; | |
1174 | ||
1175 | if (!(flags & MSG_TRYHARD)) { | |
1176 | rcu_read_lock_bh(); | |
1177 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt; | |
1178 | rt = rcu_dereference(rt->u.rt_next)) { | |
1179 | if ((flp->fld_dst == rt->fl.fld_dst) && | |
1180 | (flp->fld_src == rt->fl.fld_src) && | |
1181 | #ifdef CONFIG_DECNET_ROUTE_FWMARK | |
1182 | (flp->fld_fwmark == rt->fl.fld_fwmark) && | |
1183 | #endif | |
1184 | (rt->fl.iif == 0) && | |
1185 | (rt->fl.oif == flp->oif)) { | |
1186 | rt->u.dst.lastuse = jiffies; | |
1187 | dst_hold(&rt->u.dst); | |
1188 | rt->u.dst.__use++; | |
1189 | rcu_read_unlock_bh(); | |
1190 | *pprt = &rt->u.dst; | |
1191 | return 0; | |
1192 | } | |
1193 | } | |
1194 | rcu_read_unlock_bh(); | |
1195 | } | |
1196 | ||
1197 | return dn_route_output_slow(pprt, flp, flags); | |
1198 | } | |
1199 | ||
1200 | static int dn_route_output_key(struct dst_entry **pprt, struct flowi *flp, int flags) | |
1201 | { | |
1202 | int err; | |
1203 | ||
1204 | err = __dn_route_output_key(pprt, flp, flags); | |
1205 | if (err == 0 && flp->proto) { | |
1206 | err = xfrm_lookup(pprt, flp, NULL, 0); | |
1207 | } | |
1208 | return err; | |
1209 | } | |
1210 | ||
1211 | int dn_route_output_sock(struct dst_entry **pprt, struct flowi *fl, struct sock *sk, int flags) | |
1212 | { | |
1213 | int err; | |
1214 | ||
1215 | err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD); | |
1216 | if (err == 0 && fl->proto) { | |
1217 | err = xfrm_lookup(pprt, fl, sk, !(flags & MSG_DONTWAIT)); | |
1218 | } | |
1219 | return err; | |
1220 | } | |
1221 | ||
1222 | static int dn_route_input_slow(struct sk_buff *skb) | |
1223 | { | |
1224 | struct dn_route *rt = NULL; | |
1225 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1226 | struct net_device *in_dev = skb->dev; | |
1227 | struct net_device *out_dev = NULL; | |
1228 | struct dn_dev *dn_db; | |
1229 | struct neighbour *neigh = NULL; | |
1230 | unsigned hash; | |
1231 | int flags = 0; | |
c4ea94ab SW |
1232 | __le16 gateway = 0; |
1233 | __le16 local_src = 0; | |
1da177e4 LT |
1234 | struct flowi fl = { .nl_u = { .dn_u = |
1235 | { .daddr = cb->dst, | |
1236 | .saddr = cb->src, | |
1237 | .scope = RT_SCOPE_UNIVERSE, | |
1238 | #ifdef CONFIG_DECNET_ROUTE_FWMARK | |
1239 | .fwmark = skb->nfmark | |
1240 | #endif | |
1241 | } }, | |
1242 | .iif = skb->dev->ifindex }; | |
1243 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE }; | |
1244 | int err = -EINVAL; | |
1245 | int free_res = 0; | |
1246 | ||
1247 | dev_hold(in_dev); | |
1248 | ||
1249 | if ((dn_db = in_dev->dn_ptr) == NULL) | |
1250 | goto out; | |
1251 | ||
1252 | /* Zero source addresses are not allowed */ | |
1253 | if (fl.fld_src == 0) | |
1254 | goto out; | |
1255 | ||
1256 | /* | |
1257 | * In this case we've just received a packet from a source | |
1258 | * outside ourselves pretending to come from us. We don't | |
1259 | * allow it any further to prevent routing loops, spoofing and | |
1260 | * other nasties. Loopback packets already have the dst attached | |
1261 | * so this only affects packets which have originated elsewhere. | |
1262 | */ | |
1263 | err = -ENOTUNIQ; | |
1264 | if (dn_dev_islocal(in_dev, cb->src)) | |
1265 | goto out; | |
1266 | ||
1267 | err = dn_fib_lookup(&fl, &res); | |
1268 | if (err) { | |
1269 | if (err != -ESRCH) | |
1270 | goto out; | |
1271 | /* | |
1272 | * Is the destination us ? | |
1273 | */ | |
1274 | if (!dn_dev_islocal(in_dev, cb->dst)) | |
1275 | goto e_inval; | |
1276 | ||
1277 | res.type = RTN_LOCAL; | |
1278 | flags |= RTCF_DIRECTSRC; | |
1279 | } else { | |
c4ea94ab | 1280 | __le16 src_map = fl.fld_src; |
1da177e4 LT |
1281 | free_res = 1; |
1282 | ||
1283 | out_dev = DN_FIB_RES_DEV(res); | |
1284 | if (out_dev == NULL) { | |
1285 | if (net_ratelimit()) | |
1286 | printk(KERN_CRIT "Bug in dn_route_input_slow() " | |
1287 | "No output device\n"); | |
1288 | goto e_inval; | |
1289 | } | |
1290 | dev_hold(out_dev); | |
1291 | ||
1292 | if (res.r) | |
a8731cbf | 1293 | src_map = fl.fld_src; /* no NAT support for now */ |
1da177e4 LT |
1294 | |
1295 | gateway = DN_FIB_RES_GW(res); | |
1296 | if (res.type == RTN_NAT) { | |
1297 | fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res); | |
1298 | dn_fib_res_put(&res); | |
1299 | free_res = 0; | |
1300 | if (dn_fib_lookup(&fl, &res)) | |
1301 | goto e_inval; | |
1302 | free_res = 1; | |
1303 | if (res.type != RTN_UNICAST) | |
1304 | goto e_inval; | |
1305 | flags |= RTCF_DNAT; | |
1306 | gateway = fl.fld_dst; | |
1307 | } | |
1308 | fl.fld_src = src_map; | |
1309 | } | |
1310 | ||
1311 | switch(res.type) { | |
1312 | case RTN_UNICAST: | |
1313 | /* | |
1314 | * Forwarding check here, we only check for forwarding | |
1315 | * being turned off, if you want to only forward intra | |
1316 | * area, its up to you to set the routing tables up | |
1317 | * correctly. | |
1318 | */ | |
1319 | if (dn_db->parms.forwarding == 0) | |
1320 | goto e_inval; | |
1321 | ||
1322 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
1323 | dn_fib_select_multipath(&fl, &res); | |
1324 | ||
1325 | /* | |
1326 | * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT | |
1327 | * flag as a hint to set the intra-ethernet bit when | |
1328 | * forwarding. If we've got NAT in operation, we don't do | |
1329 | * this optimisation. | |
1330 | */ | |
1331 | if (out_dev == in_dev && !(flags & RTCF_NAT)) | |
1332 | flags |= RTCF_DOREDIRECT; | |
1333 | ||
1334 | local_src = DN_FIB_RES_PREFSRC(res); | |
1335 | ||
1336 | case RTN_BLACKHOLE: | |
1337 | case RTN_UNREACHABLE: | |
1338 | break; | |
1339 | case RTN_LOCAL: | |
1340 | flags |= RTCF_LOCAL; | |
1341 | fl.fld_src = cb->dst; | |
1342 | fl.fld_dst = cb->src; | |
1343 | ||
1344 | /* Routing tables gave us a gateway */ | |
1345 | if (gateway) | |
1346 | goto make_route; | |
1347 | ||
1348 | /* Packet was intra-ethernet, so we know its on-link */ | |
1349 | if (cb->rt_flags | DN_RT_F_IE) { | |
1350 | gateway = cb->src; | |
1351 | flags |= RTCF_DIRECTSRC; | |
1352 | goto make_route; | |
1353 | } | |
1354 | ||
1355 | /* Use the default router if there is one */ | |
1356 | neigh = neigh_clone(dn_db->router); | |
1357 | if (neigh) { | |
1358 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1359 | goto make_route; | |
1360 | } | |
1361 | ||
1362 | /* Close eyes and pray */ | |
1363 | gateway = cb->src; | |
1364 | flags |= RTCF_DIRECTSRC; | |
1365 | goto make_route; | |
1366 | default: | |
1367 | goto e_inval; | |
1368 | } | |
1369 | ||
1370 | make_route: | |
1371 | rt = dst_alloc(&dn_dst_ops); | |
1372 | if (rt == NULL) | |
1373 | goto e_nobufs; | |
1374 | ||
1375 | rt->rt_saddr = fl.fld_src; | |
1376 | rt->rt_daddr = fl.fld_dst; | |
1377 | rt->rt_gateway = fl.fld_dst; | |
1378 | if (gateway) | |
1379 | rt->rt_gateway = gateway; | |
1380 | rt->rt_local_src = local_src ? local_src : rt->rt_saddr; | |
1381 | ||
1382 | rt->rt_dst_map = fl.fld_dst; | |
1383 | rt->rt_src_map = fl.fld_src; | |
1384 | ||
1385 | rt->fl.fld_src = cb->src; | |
1386 | rt->fl.fld_dst = cb->dst; | |
1387 | rt->fl.oif = 0; | |
1388 | rt->fl.iif = in_dev->ifindex; | |
1389 | rt->fl.fld_fwmark = fl.fld_fwmark; | |
1390 | ||
1391 | rt->u.dst.flags = DST_HOST; | |
1392 | rt->u.dst.neighbour = neigh; | |
1393 | rt->u.dst.dev = out_dev; | |
1394 | rt->u.dst.lastuse = jiffies; | |
1395 | rt->u.dst.output = dn_rt_bug; | |
1396 | switch(res.type) { | |
1397 | case RTN_UNICAST: | |
1398 | rt->u.dst.input = dn_forward; | |
1399 | break; | |
1400 | case RTN_LOCAL: | |
1401 | rt->u.dst.output = dn_output; | |
1402 | rt->u.dst.input = dn_nsp_rx; | |
1403 | rt->u.dst.dev = in_dev; | |
1404 | flags |= RTCF_LOCAL; | |
1405 | break; | |
1406 | default: | |
1407 | case RTN_UNREACHABLE: | |
1408 | case RTN_BLACKHOLE: | |
1409 | rt->u.dst.input = dn_blackhole; | |
1410 | } | |
1411 | rt->rt_flags = flags; | |
1412 | if (rt->u.dst.dev) | |
1413 | dev_hold(rt->u.dst.dev); | |
1414 | ||
1415 | err = dn_rt_set_next_hop(rt, &res); | |
1416 | if (err) | |
1417 | goto e_neighbour; | |
1418 | ||
1419 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); | |
1420 | dn_insert_route(rt, hash, (struct dn_route **)&skb->dst); | |
1421 | ||
1422 | done: | |
1423 | if (neigh) | |
1424 | neigh_release(neigh); | |
1425 | if (free_res) | |
1426 | dn_fib_res_put(&res); | |
1427 | dev_put(in_dev); | |
1428 | if (out_dev) | |
1429 | dev_put(out_dev); | |
1430 | out: | |
1431 | return err; | |
1432 | ||
1433 | e_inval: | |
1434 | err = -EINVAL; | |
1435 | goto done; | |
1436 | ||
1437 | e_nobufs: | |
1438 | err = -ENOBUFS; | |
1439 | goto done; | |
1440 | ||
1441 | e_neighbour: | |
1442 | dst_free(&rt->u.dst); | |
1443 | goto done; | |
1444 | } | |
1445 | ||
1446 | int dn_route_input(struct sk_buff *skb) | |
1447 | { | |
1448 | struct dn_route *rt; | |
1449 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1450 | unsigned hash = dn_hash(cb->src, cb->dst); | |
1451 | ||
1452 | if (skb->dst) | |
1453 | return 0; | |
1454 | ||
1455 | rcu_read_lock(); | |
1456 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL; | |
1457 | rt = rcu_dereference(rt->u.rt_next)) { | |
1458 | if ((rt->fl.fld_src == cb->src) && | |
1459 | (rt->fl.fld_dst == cb->dst) && | |
1460 | (rt->fl.oif == 0) && | |
1461 | #ifdef CONFIG_DECNET_ROUTE_FWMARK | |
1462 | (rt->fl.fld_fwmark == skb->nfmark) && | |
1463 | #endif | |
1464 | (rt->fl.iif == cb->iif)) { | |
1465 | rt->u.dst.lastuse = jiffies; | |
1466 | dst_hold(&rt->u.dst); | |
1467 | rt->u.dst.__use++; | |
1468 | rcu_read_unlock(); | |
1469 | skb->dst = (struct dst_entry *)rt; | |
1470 | return 0; | |
1471 | } | |
1472 | } | |
1473 | rcu_read_unlock(); | |
1474 | ||
1475 | return dn_route_input_slow(skb); | |
1476 | } | |
1477 | ||
b6544c0b JHS |
1478 | static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
1479 | int event, int nowait, unsigned int flags) | |
1da177e4 LT |
1480 | { |
1481 | struct dn_route *rt = (struct dn_route *)skb->dst; | |
1482 | struct rtmsg *r; | |
1483 | struct nlmsghdr *nlh; | |
1484 | unsigned char *b = skb->tail; | |
1485 | struct rta_cacheinfo ci; | |
1486 | ||
b6544c0b | 1487 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); |
1da177e4 | 1488 | r = NLMSG_DATA(nlh); |
1da177e4 LT |
1489 | r->rtm_family = AF_DECnet; |
1490 | r->rtm_dst_len = 16; | |
1491 | r->rtm_src_len = 0; | |
1492 | r->rtm_tos = 0; | |
1493 | r->rtm_table = RT_TABLE_MAIN; | |
9e762a4a | 1494 | RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1da177e4 LT |
1495 | r->rtm_type = rt->rt_type; |
1496 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
1497 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
1498 | r->rtm_protocol = RTPROT_UNSPEC; | |
1499 | if (rt->rt_flags & RTCF_NOTIFY) | |
1500 | r->rtm_flags |= RTM_F_NOTIFY; | |
1501 | RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr); | |
1502 | if (rt->fl.fld_src) { | |
1503 | r->rtm_src_len = 16; | |
1504 | RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src); | |
1505 | } | |
1506 | if (rt->u.dst.dev) | |
1507 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex); | |
1508 | /* | |
1509 | * Note to self - change this if input routes reverse direction when | |
1510 | * they deal only with inputs and not with replies like they do | |
1511 | * currently. | |
1512 | */ | |
1513 | RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src); | |
1514 | if (rt->rt_daddr != rt->rt_gateway) | |
1515 | RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway); | |
1516 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) | |
1517 | goto rtattr_failure; | |
1518 | ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse); | |
1519 | ci.rta_used = rt->u.dst.__use; | |
1520 | ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt); | |
1521 | if (rt->u.dst.expires) | |
1522 | ci.rta_expires = jiffies_to_clock_t(rt->u.dst.expires - jiffies); | |
1523 | else | |
1524 | ci.rta_expires = 0; | |
1525 | ci.rta_error = rt->u.dst.error; | |
1526 | ci.rta_id = ci.rta_ts = ci.rta_tsage = 0; | |
1527 | RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci); | |
1528 | if (rt->fl.iif) | |
1529 | RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif); | |
1530 | ||
1531 | nlh->nlmsg_len = skb->tail - b; | |
1532 | return skb->len; | |
1533 | ||
1534 | nlmsg_failure: | |
1535 | rtattr_failure: | |
1536 | skb_trim(skb, b - skb->data); | |
1537 | return -1; | |
1538 | } | |
1539 | ||
1540 | /* | |
1541 | * This is called by both endnodes and routers now. | |
1542 | */ | |
1543 | int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg) | |
1544 | { | |
1545 | struct rtattr **rta = arg; | |
1546 | struct rtmsg *rtm = NLMSG_DATA(nlh); | |
1547 | struct dn_route *rt = NULL; | |
1548 | struct dn_skb_cb *cb; | |
1549 | int err; | |
1550 | struct sk_buff *skb; | |
1551 | struct flowi fl; | |
1552 | ||
1553 | memset(&fl, 0, sizeof(fl)); | |
1554 | fl.proto = DNPROTO_NSP; | |
1555 | ||
1556 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1557 | if (skb == NULL) | |
1558 | return -ENOBUFS; | |
1559 | skb->mac.raw = skb->data; | |
1560 | cb = DN_SKB_CB(skb); | |
1561 | ||
1562 | if (rta[RTA_SRC-1]) | |
1563 | memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2); | |
1564 | if (rta[RTA_DST-1]) | |
1565 | memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2); | |
1566 | if (rta[RTA_IIF-1]) | |
1567 | memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); | |
1568 | ||
1569 | if (fl.iif) { | |
1570 | struct net_device *dev; | |
1571 | if ((dev = dev_get_by_index(fl.iif)) == NULL) { | |
1572 | kfree_skb(skb); | |
1573 | return -ENODEV; | |
1574 | } | |
1575 | if (!dev->dn_ptr) { | |
1576 | dev_put(dev); | |
1577 | kfree_skb(skb); | |
1578 | return -ENODEV; | |
1579 | } | |
1580 | skb->protocol = __constant_htons(ETH_P_DNA_RT); | |
1581 | skb->dev = dev; | |
1582 | cb->src = fl.fld_src; | |
1583 | cb->dst = fl.fld_dst; | |
1584 | local_bh_disable(); | |
1585 | err = dn_route_input(skb); | |
1586 | local_bh_enable(); | |
1587 | memset(cb, 0, sizeof(struct dn_skb_cb)); | |
1588 | rt = (struct dn_route *)skb->dst; | |
1589 | if (!err && -rt->u.dst.error) | |
1590 | err = rt->u.dst.error; | |
1591 | } else { | |
1592 | int oif = 0; | |
1593 | if (rta[RTA_OIF - 1]) | |
1594 | memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int)); | |
1595 | fl.oif = oif; | |
1596 | err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0); | |
1597 | } | |
1598 | ||
1599 | if (skb->dev) | |
1600 | dev_put(skb->dev); | |
1601 | skb->dev = NULL; | |
1602 | if (err) | |
1603 | goto out_free; | |
1604 | skb->dst = &rt->u.dst; | |
1605 | if (rtm->rtm_flags & RTM_F_NOTIFY) | |
1606 | rt->rt_flags |= RTCF_NOTIFY; | |
1607 | ||
1608 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; | |
1609 | ||
b6544c0b | 1610 | err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0); |
1da177e4 LT |
1611 | |
1612 | if (err == 0) | |
1613 | goto out_free; | |
1614 | if (err < 0) { | |
1615 | err = -EMSGSIZE; | |
1616 | goto out_free; | |
1617 | } | |
1618 | ||
2942e900 | 1619 | return rtnl_unicast(skb, NETLINK_CB(in_skb).pid); |
1da177e4 LT |
1620 | |
1621 | out_free: | |
1622 | kfree_skb(skb); | |
1623 | return err; | |
1624 | } | |
1625 | ||
1626 | /* | |
1627 | * For routers, this is called from dn_fib_dump, but for endnodes its | |
1628 | * called directly from the rtnetlink dispatch table. | |
1629 | */ | |
1630 | int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1631 | { | |
1632 | struct dn_route *rt; | |
1633 | int h, s_h; | |
1634 | int idx, s_idx; | |
1635 | ||
1636 | if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg)) | |
1637 | return -EINVAL; | |
1638 | if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)) | |
1639 | return 0; | |
1640 | ||
1641 | s_h = cb->args[0]; | |
1642 | s_idx = idx = cb->args[1]; | |
1643 | for(h = 0; h <= dn_rt_hash_mask; h++) { | |
1644 | if (h < s_h) | |
1645 | continue; | |
1646 | if (h > s_h) | |
1647 | s_idx = 0; | |
1648 | rcu_read_lock_bh(); | |
1649 | for(rt = rcu_dereference(dn_rt_hash_table[h].chain), idx = 0; | |
1650 | rt; | |
1651 | rt = rcu_dereference(rt->u.rt_next), idx++) { | |
1652 | if (idx < s_idx) | |
1653 | continue; | |
1654 | skb->dst = dst_clone(&rt->u.dst); | |
1655 | if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
b6544c0b JHS |
1656 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
1657 | 1, NLM_F_MULTI) <= 0) { | |
1da177e4 LT |
1658 | dst_release(xchg(&skb->dst, NULL)); |
1659 | rcu_read_unlock_bh(); | |
1660 | goto done; | |
1661 | } | |
1662 | dst_release(xchg(&skb->dst, NULL)); | |
1663 | } | |
1664 | rcu_read_unlock_bh(); | |
1665 | } | |
1666 | ||
1667 | done: | |
1668 | cb->args[0] = h; | |
1669 | cb->args[1] = idx; | |
1670 | return skb->len; | |
1671 | } | |
1672 | ||
1673 | #ifdef CONFIG_PROC_FS | |
1674 | struct dn_rt_cache_iter_state { | |
1675 | int bucket; | |
1676 | }; | |
1677 | ||
1678 | static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq) | |
1679 | { | |
1680 | struct dn_route *rt = NULL; | |
1681 | struct dn_rt_cache_iter_state *s = seq->private; | |
1682 | ||
1683 | for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) { | |
1684 | rcu_read_lock_bh(); | |
1685 | rt = dn_rt_hash_table[s->bucket].chain; | |
1686 | if (rt) | |
1687 | break; | |
1688 | rcu_read_unlock_bh(); | |
1689 | } | |
1690 | return rt; | |
1691 | } | |
1692 | ||
1693 | static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt) | |
1694 | { | |
1695 | struct dn_rt_cache_iter_state *s = rcu_dereference(seq->private); | |
1696 | ||
1697 | rt = rt->u.rt_next; | |
1698 | while(!rt) { | |
1699 | rcu_read_unlock_bh(); | |
1700 | if (--s->bucket < 0) | |
1701 | break; | |
1702 | rcu_read_lock_bh(); | |
1703 | rt = dn_rt_hash_table[s->bucket].chain; | |
1704 | } | |
1705 | return rt; | |
1706 | } | |
1707 | ||
1708 | static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
1709 | { | |
1710 | struct dn_route *rt = dn_rt_cache_get_first(seq); | |
1711 | ||
1712 | if (rt) { | |
1713 | while(*pos && (rt = dn_rt_cache_get_next(seq, rt))) | |
1714 | --*pos; | |
1715 | } | |
1716 | return *pos ? NULL : rt; | |
1717 | } | |
1718 | ||
1719 | static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1720 | { | |
1721 | struct dn_route *rt = dn_rt_cache_get_next(seq, v); | |
1722 | ++*pos; | |
1723 | return rt; | |
1724 | } | |
1725 | ||
1726 | static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v) | |
1727 | { | |
1728 | if (v) | |
1729 | rcu_read_unlock_bh(); | |
1730 | } | |
1731 | ||
1732 | static int dn_rt_cache_seq_show(struct seq_file *seq, void *v) | |
1733 | { | |
1734 | struct dn_route *rt = v; | |
1735 | char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN]; | |
1736 | ||
1737 | seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n", | |
1738 | rt->u.dst.dev ? rt->u.dst.dev->name : "*", | |
1739 | dn_addr2asc(dn_ntohs(rt->rt_daddr), buf1), | |
1740 | dn_addr2asc(dn_ntohs(rt->rt_saddr), buf2), | |
1741 | atomic_read(&rt->u.dst.__refcnt), | |
1742 | rt->u.dst.__use, | |
1743 | (int) dst_metric(&rt->u.dst, RTAX_RTT)); | |
1744 | return 0; | |
1745 | } | |
1746 | ||
1747 | static struct seq_operations dn_rt_cache_seq_ops = { | |
1748 | .start = dn_rt_cache_seq_start, | |
1749 | .next = dn_rt_cache_seq_next, | |
1750 | .stop = dn_rt_cache_seq_stop, | |
1751 | .show = dn_rt_cache_seq_show, | |
1752 | }; | |
1753 | ||
1754 | static int dn_rt_cache_seq_open(struct inode *inode, struct file *file) | |
1755 | { | |
1756 | struct seq_file *seq; | |
1757 | int rc = -ENOMEM; | |
1758 | struct dn_rt_cache_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1759 | ||
1760 | if (!s) | |
1761 | goto out; | |
1762 | rc = seq_open(file, &dn_rt_cache_seq_ops); | |
1763 | if (rc) | |
1764 | goto out_kfree; | |
1765 | seq = file->private_data; | |
1766 | seq->private = s; | |
1767 | memset(s, 0, sizeof(*s)); | |
1768 | out: | |
1769 | return rc; | |
1770 | out_kfree: | |
1771 | kfree(s); | |
1772 | goto out; | |
1773 | } | |
1774 | ||
1775 | static struct file_operations dn_rt_cache_seq_fops = { | |
1776 | .owner = THIS_MODULE, | |
1777 | .open = dn_rt_cache_seq_open, | |
1778 | .read = seq_read, | |
1779 | .llseek = seq_lseek, | |
1780 | .release = seq_release_private, | |
1781 | }; | |
1782 | ||
1783 | #endif /* CONFIG_PROC_FS */ | |
1784 | ||
1785 | void __init dn_route_init(void) | |
1786 | { | |
1787 | int i, goal, order; | |
1788 | ||
e5d679f3 AD |
1789 | dn_dst_ops.kmem_cachep = |
1790 | kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0, | |
1791 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL); | |
1da177e4 LT |
1792 | init_timer(&dn_route_timer); |
1793 | dn_route_timer.function = dn_dst_check_expire; | |
1794 | dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; | |
1795 | add_timer(&dn_route_timer); | |
1796 | ||
1797 | goal = num_physpages >> (26 - PAGE_SHIFT); | |
1798 | ||
1799 | for(order = 0; (1UL << order) < goal; order++) | |
1800 | /* NOTHING */; | |
1801 | ||
1802 | /* | |
1803 | * Only want 1024 entries max, since the table is very, very unlikely | |
1804 | * to be larger than that. | |
1805 | */ | |
1806 | while(order && ((((1UL << order) * PAGE_SIZE) / | |
1807 | sizeof(struct dn_rt_hash_bucket)) >= 2048)) | |
1808 | order--; | |
1809 | ||
1810 | do { | |
1811 | dn_rt_hash_mask = (1UL << order) * PAGE_SIZE / | |
1812 | sizeof(struct dn_rt_hash_bucket); | |
1813 | while(dn_rt_hash_mask & (dn_rt_hash_mask - 1)) | |
1814 | dn_rt_hash_mask--; | |
1815 | dn_rt_hash_table = (struct dn_rt_hash_bucket *) | |
1816 | __get_free_pages(GFP_ATOMIC, order); | |
1817 | } while (dn_rt_hash_table == NULL && --order > 0); | |
1818 | ||
1819 | if (!dn_rt_hash_table) | |
1820 | panic("Failed to allocate DECnet route cache hash table\n"); | |
1821 | ||
1822 | printk(KERN_INFO | |
1823 | "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n", | |
1824 | dn_rt_hash_mask, | |
1825 | (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024); | |
1826 | ||
1827 | dn_rt_hash_mask--; | |
1828 | for(i = 0; i <= dn_rt_hash_mask; i++) { | |
1829 | spin_lock_init(&dn_rt_hash_table[i].lock); | |
1830 | dn_rt_hash_table[i].chain = NULL; | |
1831 | } | |
1832 | ||
1833 | dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1); | |
1834 | ||
1835 | proc_net_fops_create("decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops); | |
1836 | } | |
1837 | ||
1838 | void __exit dn_route_cleanup(void) | |
1839 | { | |
1840 | del_timer(&dn_route_timer); | |
1841 | dn_run_flush(0); | |
1842 | ||
1843 | proc_net_remove("decnet_cache"); | |
1844 | } | |
1845 |