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 | |
429eb0fa | 46 | |
1da177e4 LT |
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> | |
5a0e3ad6 | 69 | #include <linux/slab.h> |
1da177e4 LT |
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> | |
457c4cbc | 81 | #include <net/net_namespace.h> |
dc5fc579 | 82 | #include <net/netlink.h> |
1da177e4 LT |
83 | #include <net/neighbour.h> |
84 | #include <net/dst.h> | |
85 | #include <net/flow.h> | |
a8731cbf | 86 | #include <net/fib_rules.h> |
1da177e4 LT |
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 | { | |
fc766e4c | 96 | struct dn_route __rcu *chain; |
1da177e4 | 97 | spinlock_t lock; |
fca09fb7 | 98 | }; |
1da177e4 LT |
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 | ||
569d3645 | 111 | static int dn_dst_gc(struct dst_ops *ops); |
1da177e4 | 112 | static struct dst_entry *dn_dst_check(struct dst_entry *, __u32); |
0dbaee3b | 113 | static unsigned int dn_dst_default_advmss(const struct dst_entry *dst); |
d33e4553 | 114 | static unsigned int dn_dst_default_mtu(const struct dst_entry *dst); |
62fa8a84 | 115 | static void dn_dst_destroy(struct dst_entry *); |
1da177e4 LT |
116 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *); |
117 | static void dn_dst_link_failure(struct sk_buff *); | |
118 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu); | |
d3aaeb38 | 119 | static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, const void *daddr); |
1da177e4 LT |
120 | static int dn_route_input(struct sk_buff *); |
121 | static void dn_run_flush(unsigned long dummy); | |
122 | ||
123 | static struct dn_rt_hash_bucket *dn_rt_hash_table; | |
124 | static unsigned dn_rt_hash_mask; | |
125 | ||
126 | static struct timer_list dn_route_timer; | |
8d06afab | 127 | static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0); |
1da177e4 LT |
128 | int decnet_dst_gc_interval = 2; |
129 | ||
130 | static struct dst_ops dn_dst_ops = { | |
131 | .family = PF_DECnet, | |
09640e63 | 132 | .protocol = cpu_to_be16(ETH_P_DNA_RT), |
1da177e4 LT |
133 | .gc_thresh = 128, |
134 | .gc = dn_dst_gc, | |
135 | .check = dn_dst_check, | |
0dbaee3b | 136 | .default_advmss = dn_dst_default_advmss, |
d33e4553 | 137 | .default_mtu = dn_dst_default_mtu, |
62fa8a84 DM |
138 | .cow_metrics = dst_cow_metrics_generic, |
139 | .destroy = dn_dst_destroy, | |
1da177e4 LT |
140 | .negative_advice = dn_dst_negative_advice, |
141 | .link_failure = dn_dst_link_failure, | |
142 | .update_pmtu = dn_dst_update_pmtu, | |
d3aaeb38 | 143 | .neigh_lookup = dn_dst_neigh_lookup, |
1da177e4 LT |
144 | }; |
145 | ||
62fa8a84 DM |
146 | static void dn_dst_destroy(struct dst_entry *dst) |
147 | { | |
148 | dst_destroy_metrics_generic(dst); | |
149 | } | |
150 | ||
c4ea94ab | 151 | static __inline__ unsigned dn_hash(__le16 src, __le16 dst) |
1da177e4 | 152 | { |
c4ea94ab | 153 | __u16 tmp = (__u16 __force)(src ^ dst); |
1da177e4 LT |
154 | tmp ^= (tmp >> 3); |
155 | tmp ^= (tmp >> 5); | |
156 | tmp ^= (tmp >> 10); | |
157 | return dn_rt_hash_mask & (unsigned)tmp; | |
158 | } | |
159 | ||
160 | static inline void dnrt_free(struct dn_route *rt) | |
161 | { | |
d8d1f30b | 162 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); |
1da177e4 LT |
163 | } |
164 | ||
165 | static inline void dnrt_drop(struct dn_route *rt) | |
166 | { | |
d8d1f30b CG |
167 | dst_release(&rt->dst); |
168 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); | |
1da177e4 LT |
169 | } |
170 | ||
171 | static void dn_dst_check_expire(unsigned long dummy) | |
172 | { | |
173 | int i; | |
fc766e4c ED |
174 | struct dn_route *rt; |
175 | struct dn_route __rcu **rtp; | |
1da177e4 LT |
176 | unsigned long now = jiffies; |
177 | unsigned long expire = 120 * HZ; | |
178 | ||
fc766e4c | 179 | for (i = 0; i <= dn_rt_hash_mask; i++) { |
1da177e4 LT |
180 | rtp = &dn_rt_hash_table[i].chain; |
181 | ||
182 | spin_lock(&dn_rt_hash_table[i].lock); | |
fc766e4c ED |
183 | while ((rt = rcu_dereference_protected(*rtp, |
184 | lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) { | |
d8d1f30b CG |
185 | if (atomic_read(&rt->dst.__refcnt) || |
186 | (now - rt->dst.lastuse) < expire) { | |
187 | rtp = &rt->dst.dn_next; | |
1da177e4 LT |
188 | continue; |
189 | } | |
d8d1f30b CG |
190 | *rtp = rt->dst.dn_next; |
191 | rt->dst.dn_next = NULL; | |
1da177e4 LT |
192 | dnrt_free(rt); |
193 | } | |
194 | spin_unlock(&dn_rt_hash_table[i].lock); | |
195 | ||
196 | if ((jiffies - now) > 0) | |
197 | break; | |
198 | } | |
199 | ||
200 | mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ); | |
201 | } | |
202 | ||
569d3645 | 203 | static int dn_dst_gc(struct dst_ops *ops) |
1da177e4 | 204 | { |
fc766e4c ED |
205 | struct dn_route *rt; |
206 | struct dn_route __rcu **rtp; | |
1da177e4 LT |
207 | int i; |
208 | unsigned long now = jiffies; | |
209 | unsigned long expire = 10 * HZ; | |
210 | ||
fc766e4c | 211 | for (i = 0; i <= dn_rt_hash_mask; i++) { |
1da177e4 LT |
212 | |
213 | spin_lock_bh(&dn_rt_hash_table[i].lock); | |
214 | rtp = &dn_rt_hash_table[i].chain; | |
215 | ||
fc766e4c ED |
216 | while ((rt = rcu_dereference_protected(*rtp, |
217 | lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) { | |
d8d1f30b CG |
218 | if (atomic_read(&rt->dst.__refcnt) || |
219 | (now - rt->dst.lastuse) < expire) { | |
220 | rtp = &rt->dst.dn_next; | |
1da177e4 LT |
221 | continue; |
222 | } | |
d8d1f30b CG |
223 | *rtp = rt->dst.dn_next; |
224 | rt->dst.dn_next = NULL; | |
1da177e4 LT |
225 | dnrt_drop(rt); |
226 | break; | |
227 | } | |
228 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
229 | } | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | /* | |
235 | * The decnet standards don't impose a particular minimum mtu, what they | |
236 | * do insist on is that the routing layer accepts a datagram of at least | |
237 | * 230 bytes long. Here we have to subtract the routing header length from | |
238 | * 230 to get the minimum acceptable mtu. If there is no neighbour, then we | |
239 | * assume the worst and use a long header size. | |
240 | * | |
241 | * We update both the mtu and the advertised mss (i.e. the segment size we | |
242 | * advertise to the other end). | |
243 | */ | |
244 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu) | |
245 | { | |
69cce1d1 | 246 | struct neighbour *n = dst_get_neighbour(dst); |
1da177e4 | 247 | u32 min_mtu = 230; |
69cce1d1 DM |
248 | struct dn_dev *dn; |
249 | ||
250 | dn = n ? rcu_dereference_raw(n->dev->dn_ptr) : NULL; | |
1da177e4 LT |
251 | |
252 | if (dn && dn->use_long == 0) | |
253 | min_mtu -= 6; | |
254 | else | |
255 | min_mtu -= 21; | |
256 | ||
5ffc02a1 | 257 | if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= min_mtu) { |
1da177e4 | 258 | if (!(dst_metric_locked(dst, RTAX_MTU))) { |
defb3519 | 259 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
260 | dst_set_expires(dst, dn_rt_mtu_expires); |
261 | } | |
262 | if (!(dst_metric_locked(dst, RTAX_ADVMSS))) { | |
263 | u32 mss = mtu - DN_MAX_NSP_DATA_HEADER; | |
0dbaee3b DM |
264 | u32 existing_mss = dst_metric_raw(dst, RTAX_ADVMSS); |
265 | if (!existing_mss || existing_mss > mss) | |
defb3519 | 266 | dst_metric_set(dst, RTAX_ADVMSS, mss); |
1da177e4 LT |
267 | } |
268 | } | |
269 | } | |
270 | ||
429eb0fa | 271 | /* |
1da177e4 LT |
272 | * When a route has been marked obsolete. (e.g. routing cache flush) |
273 | */ | |
274 | static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie) | |
275 | { | |
276 | return NULL; | |
277 | } | |
278 | ||
279 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst) | |
280 | { | |
281 | dst_release(dst); | |
282 | return NULL; | |
283 | } | |
284 | ||
285 | static void dn_dst_link_failure(struct sk_buff *skb) | |
286 | { | |
1da177e4 LT |
287 | } |
288 | ||
bef55aeb | 289 | static inline int compare_keys(struct flowidn *fl1, struct flowidn *fl2) |
1da177e4 | 290 | { |
bef55aeb DM |
291 | return ((fl1->daddr ^ fl2->daddr) | |
292 | (fl1->saddr ^ fl2->saddr) | | |
293 | (fl1->flowidn_mark ^ fl2->flowidn_mark) | | |
294 | (fl1->flowidn_scope ^ fl2->flowidn_scope) | | |
295 | (fl1->flowidn_oif ^ fl2->flowidn_oif) | | |
296 | (fl1->flowidn_iif ^ fl2->flowidn_iif)) == 0; | |
1da177e4 LT |
297 | } |
298 | ||
299 | static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp) | |
300 | { | |
fc766e4c ED |
301 | struct dn_route *rth; |
302 | struct dn_route __rcu **rthp; | |
1da177e4 LT |
303 | unsigned long now = jiffies; |
304 | ||
305 | rthp = &dn_rt_hash_table[hash].chain; | |
306 | ||
307 | spin_lock_bh(&dn_rt_hash_table[hash].lock); | |
fc766e4c ED |
308 | while ((rth = rcu_dereference_protected(*rthp, |
309 | lockdep_is_held(&dn_rt_hash_table[hash].lock))) != NULL) { | |
bef55aeb | 310 | if (compare_keys(&rth->fld, &rt->fld)) { |
1da177e4 | 311 | /* Put it first */ |
d8d1f30b CG |
312 | *rthp = rth->dst.dn_next; |
313 | rcu_assign_pointer(rth->dst.dn_next, | |
1da177e4 LT |
314 | dn_rt_hash_table[hash].chain); |
315 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth); | |
316 | ||
d8d1f30b | 317 | dst_use(&rth->dst, now); |
1da177e4 LT |
318 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
319 | ||
320 | dnrt_drop(rt); | |
321 | *rp = rth; | |
322 | return 0; | |
323 | } | |
d8d1f30b | 324 | rthp = &rth->dst.dn_next; |
1da177e4 LT |
325 | } |
326 | ||
d8d1f30b | 327 | rcu_assign_pointer(rt->dst.dn_next, dn_rt_hash_table[hash].chain); |
1da177e4 | 328 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt); |
429eb0fa | 329 | |
d8d1f30b | 330 | dst_use(&rt->dst, now); |
1da177e4 LT |
331 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
332 | *rp = rt; | |
333 | return 0; | |
334 | } | |
335 | ||
5eaa65b2 | 336 | static void dn_run_flush(unsigned long dummy) |
1da177e4 LT |
337 | { |
338 | int i; | |
339 | struct dn_route *rt, *next; | |
340 | ||
fc766e4c | 341 | for (i = 0; i < dn_rt_hash_mask; i++) { |
1da177e4 LT |
342 | spin_lock_bh(&dn_rt_hash_table[i].lock); |
343 | ||
fc766e4c | 344 | if ((rt = xchg((struct dn_route **)&dn_rt_hash_table[i].chain, NULL)) == NULL) |
1da177e4 LT |
345 | goto nothing_to_declare; |
346 | ||
fc766e4c ED |
347 | for(; rt; rt = next) { |
348 | next = rcu_dereference_raw(rt->dst.dn_next); | |
349 | RCU_INIT_POINTER(rt->dst.dn_next, NULL); | |
1da177e4 LT |
350 | dst_free((struct dst_entry *)rt); |
351 | } | |
352 | ||
353 | nothing_to_declare: | |
354 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
355 | } | |
356 | } | |
357 | ||
358 | static DEFINE_SPINLOCK(dn_rt_flush_lock); | |
359 | ||
360 | void dn_rt_cache_flush(int delay) | |
361 | { | |
362 | unsigned long now = jiffies; | |
363 | int user_mode = !in_interrupt(); | |
364 | ||
365 | if (delay < 0) | |
366 | delay = dn_rt_min_delay; | |
367 | ||
368 | spin_lock_bh(&dn_rt_flush_lock); | |
369 | ||
370 | if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) { | |
371 | long tmo = (long)(dn_rt_deadline - now); | |
372 | ||
373 | if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay) | |
374 | tmo = 0; | |
375 | ||
376 | if (delay > tmo) | |
377 | delay = tmo; | |
378 | } | |
379 | ||
380 | if (delay <= 0) { | |
381 | spin_unlock_bh(&dn_rt_flush_lock); | |
382 | dn_run_flush(0); | |
383 | return; | |
384 | } | |
385 | ||
386 | if (dn_rt_deadline == 0) | |
387 | dn_rt_deadline = now + dn_rt_max_delay; | |
388 | ||
389 | dn_rt_flush_timer.expires = now + delay; | |
390 | add_timer(&dn_rt_flush_timer); | |
391 | spin_unlock_bh(&dn_rt_flush_lock); | |
392 | } | |
393 | ||
394 | /** | |
395 | * dn_return_short - Return a short packet to its sender | |
396 | * @skb: The packet to return | |
397 | * | |
398 | */ | |
399 | static int dn_return_short(struct sk_buff *skb) | |
400 | { | |
401 | struct dn_skb_cb *cb; | |
402 | unsigned char *ptr; | |
c4ea94ab SW |
403 | __le16 *src; |
404 | __le16 *dst; | |
1da177e4 LT |
405 | |
406 | /* Add back headers */ | |
d56f90a7 | 407 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
408 | |
409 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) | |
410 | return NET_RX_DROP; | |
411 | ||
412 | cb = DN_SKB_CB(skb); | |
413 | /* Skip packet length and point to flags */ | |
414 | ptr = skb->data + 2; | |
415 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; | |
416 | ||
c4ea94ab | 417 | dst = (__le16 *)ptr; |
1da177e4 | 418 | ptr += 2; |
c4ea94ab | 419 | src = (__le16 *)ptr; |
1da177e4 LT |
420 | ptr += 2; |
421 | *ptr = 0; /* Zero hop count */ | |
422 | ||
a0bffffc | 423 | swap(*src, *dst); |
1da177e4 LT |
424 | |
425 | skb->pkt_type = PACKET_OUTGOING; | |
426 | dn_rt_finish_output(skb, NULL, NULL); | |
427 | return NET_RX_SUCCESS; | |
428 | } | |
429 | ||
430 | /** | |
431 | * dn_return_long - Return a long packet to its sender | |
432 | * @skb: The long format packet to return | |
433 | * | |
434 | */ | |
435 | static int dn_return_long(struct sk_buff *skb) | |
436 | { | |
437 | struct dn_skb_cb *cb; | |
438 | unsigned char *ptr; | |
439 | unsigned char *src_addr, *dst_addr; | |
440 | unsigned char tmp[ETH_ALEN]; | |
441 | ||
442 | /* Add back all headers */ | |
d56f90a7 | 443 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
444 | |
445 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) | |
446 | return NET_RX_DROP; | |
447 | ||
448 | cb = DN_SKB_CB(skb); | |
449 | /* Ignore packet length and point to flags */ | |
450 | ptr = skb->data + 2; | |
451 | ||
452 | /* Skip padding */ | |
453 | if (*ptr & DN_RT_F_PF) { | |
454 | char padlen = (*ptr & ~DN_RT_F_PF); | |
455 | ptr += padlen; | |
456 | } | |
457 | ||
458 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; | |
459 | ptr += 2; | |
460 | dst_addr = ptr; | |
461 | ptr += 8; | |
462 | src_addr = ptr; | |
463 | ptr += 6; | |
464 | *ptr = 0; /* Zero hop count */ | |
465 | ||
466 | /* Swap source and destination */ | |
467 | memcpy(tmp, src_addr, ETH_ALEN); | |
468 | memcpy(src_addr, dst_addr, ETH_ALEN); | |
469 | memcpy(dst_addr, tmp, ETH_ALEN); | |
470 | ||
471 | skb->pkt_type = PACKET_OUTGOING; | |
472 | dn_rt_finish_output(skb, dst_addr, src_addr); | |
473 | return NET_RX_SUCCESS; | |
474 | } | |
475 | ||
476 | /** | |
477 | * dn_route_rx_packet - Try and find a route for an incoming packet | |
478 | * @skb: The packet to find a route for | |
479 | * | |
480 | * Returns: result of input function if route is found, error code otherwise | |
481 | */ | |
482 | static int dn_route_rx_packet(struct sk_buff *skb) | |
483 | { | |
fc766e4c | 484 | struct dn_skb_cb *cb; |
1da177e4 LT |
485 | int err; |
486 | ||
487 | if ((err = dn_route_input(skb)) == 0) | |
488 | return dst_input(skb); | |
489 | ||
fc766e4c | 490 | cb = DN_SKB_CB(skb); |
1da177e4 LT |
491 | if (decnet_debug_level & 4) { |
492 | char *devname = skb->dev ? skb->dev->name : "???"; | |
fc766e4c | 493 | |
1da177e4 LT |
494 | printk(KERN_DEBUG |
495 | "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 | 496 | (int)cb->rt_flags, devname, skb->len, |
c4106aa8 | 497 | le16_to_cpu(cb->src), le16_to_cpu(cb->dst), |
1da177e4 LT |
498 | err, skb->pkt_type); |
499 | } | |
500 | ||
501 | if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) { | |
06f8fe11 JP |
502 | switch (cb->rt_flags & DN_RT_PKT_MSK) { |
503 | case DN_RT_PKT_SHORT: | |
504 | return dn_return_short(skb); | |
505 | case DN_RT_PKT_LONG: | |
506 | return dn_return_long(skb); | |
1da177e4 LT |
507 | } |
508 | } | |
509 | ||
510 | kfree_skb(skb); | |
511 | return NET_RX_DROP; | |
512 | } | |
513 | ||
514 | static int dn_route_rx_long(struct sk_buff *skb) | |
515 | { | |
516 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
517 | unsigned char *ptr = skb->data; | |
518 | ||
519 | if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */ | |
520 | goto drop_it; | |
521 | ||
522 | skb_pull(skb, 20); | |
badff6d0 | 523 | skb_reset_transport_header(skb); |
1da177e4 | 524 | |
429eb0fa YH |
525 | /* Destination info */ |
526 | ptr += 2; | |
c4ea94ab | 527 | cb->dst = dn_eth2dn(ptr); |
429eb0fa YH |
528 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
529 | goto drop_it; | |
530 | ptr += 6; | |
1da177e4 LT |
531 | |
532 | ||
429eb0fa YH |
533 | /* Source info */ |
534 | ptr += 2; | |
c4ea94ab | 535 | cb->src = dn_eth2dn(ptr); |
429eb0fa YH |
536 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
537 | goto drop_it; | |
538 | ptr += 6; | |
539 | /* Other junk */ | |
540 | ptr++; | |
541 | cb->hops = *ptr++; /* Visit Count */ | |
1da177e4 | 542 | |
5d877d87 JE |
543 | return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, |
544 | dn_route_rx_packet); | |
1da177e4 LT |
545 | |
546 | drop_it: | |
547 | kfree_skb(skb); | |
548 | return NET_RX_DROP; | |
549 | } | |
550 | ||
551 | ||
552 | ||
553 | static int dn_route_rx_short(struct sk_buff *skb) | |
554 | { | |
555 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
556 | unsigned char *ptr = skb->data; | |
557 | ||
558 | if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */ | |
559 | goto drop_it; | |
560 | ||
561 | skb_pull(skb, 5); | |
badff6d0 | 562 | skb_reset_transport_header(skb); |
1da177e4 | 563 | |
c4ea94ab | 564 | cb->dst = *(__le16 *)ptr; |
429eb0fa YH |
565 | ptr += 2; |
566 | cb->src = *(__le16 *)ptr; | |
567 | ptr += 2; | |
568 | cb->hops = *ptr & 0x3f; | |
1da177e4 | 569 | |
5d877d87 JE |
570 | return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, |
571 | dn_route_rx_packet); | |
1da177e4 LT |
572 | |
573 | drop_it: | |
429eb0fa YH |
574 | kfree_skb(skb); |
575 | return NET_RX_DROP; | |
1da177e4 LT |
576 | } |
577 | ||
578 | static int dn_route_discard(struct sk_buff *skb) | |
579 | { | |
580 | /* | |
581 | * I know we drop the packet here, but thats considered success in | |
582 | * this case | |
583 | */ | |
584 | kfree_skb(skb); | |
585 | return NET_RX_SUCCESS; | |
586 | } | |
587 | ||
588 | static int dn_route_ptp_hello(struct sk_buff *skb) | |
589 | { | |
590 | dn_dev_hello(skb); | |
591 | dn_neigh_pointopoint_hello(skb); | |
592 | return NET_RX_SUCCESS; | |
593 | } | |
594 | ||
f2ccd8fa | 595 | int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
596 | { |
597 | struct dn_skb_cb *cb; | |
598 | unsigned char flags = 0; | |
c4106aa8 | 599 | __u16 len = le16_to_cpu(*(__le16 *)skb->data); |
fc766e4c | 600 | struct dn_dev *dn = rcu_dereference(dev->dn_ptr); |
1da177e4 LT |
601 | unsigned char padlen = 0; |
602 | ||
721499e8 | 603 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
604 | goto dump_it; |
605 | ||
1da177e4 LT |
606 | if (dn == NULL) |
607 | goto dump_it; | |
608 | ||
609 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
610 | goto out; | |
611 | ||
612 | if (!pskb_may_pull(skb, 3)) | |
613 | goto dump_it; | |
614 | ||
615 | skb_pull(skb, 2); | |
616 | ||
617 | if (len > skb->len) | |
618 | goto dump_it; | |
619 | ||
620 | skb_trim(skb, len); | |
621 | ||
622 | flags = *skb->data; | |
623 | ||
624 | cb = DN_SKB_CB(skb); | |
625 | cb->stamp = jiffies; | |
626 | cb->iif = dev->ifindex; | |
627 | ||
628 | /* | |
629 | * If we have padding, remove it. | |
630 | */ | |
631 | if (flags & DN_RT_F_PF) { | |
632 | padlen = flags & ~DN_RT_F_PF; | |
633 | if (!pskb_may_pull(skb, padlen + 1)) | |
634 | goto dump_it; | |
635 | skb_pull(skb, padlen); | |
636 | flags = *skb->data; | |
637 | } | |
638 | ||
c1d2bbe1 | 639 | skb_reset_network_header(skb); |
1da177e4 LT |
640 | |
641 | /* | |
642 | * Weed out future version DECnet | |
643 | */ | |
644 | if (flags & DN_RT_F_VER) | |
645 | goto dump_it; | |
646 | ||
647 | cb->rt_flags = flags; | |
648 | ||
649 | if (decnet_debug_level & 1) | |
429eb0fa | 650 | printk(KERN_DEBUG |
1da177e4 | 651 | "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n", |
429eb0fa | 652 | (int)flags, (dev) ? dev->name : "???", len, skb->len, |
1da177e4 LT |
653 | padlen); |
654 | ||
429eb0fa | 655 | if (flags & DN_RT_PKT_CNTL) { |
364c6bad | 656 | if (unlikely(skb_linearize(skb))) |
1da177e4 LT |
657 | goto dump_it; |
658 | ||
06f8fe11 JP |
659 | switch (flags & DN_RT_CNTL_MSK) { |
660 | case DN_RT_PKT_INIT: | |
661 | dn_dev_init_pkt(skb); | |
662 | break; | |
663 | case DN_RT_PKT_VERI: | |
664 | dn_dev_veri_pkt(skb); | |
665 | break; | |
1da177e4 LT |
666 | } |
667 | ||
668 | if (dn->parms.state != DN_DEV_S_RU) | |
669 | goto dump_it; | |
670 | ||
06f8fe11 JP |
671 | switch (flags & DN_RT_CNTL_MSK) { |
672 | case DN_RT_PKT_HELO: | |
673 | return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, | |
674 | skb, skb->dev, NULL, | |
675 | dn_route_ptp_hello); | |
676 | ||
677 | case DN_RT_PKT_L1RT: | |
678 | case DN_RT_PKT_L2RT: | |
679 | return NF_HOOK(NFPROTO_DECNET, NF_DN_ROUTE, | |
680 | skb, skb->dev, NULL, | |
681 | dn_route_discard); | |
682 | case DN_RT_PKT_ERTH: | |
683 | return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, | |
684 | skb, skb->dev, NULL, | |
685 | dn_neigh_router_hello); | |
686 | ||
687 | case DN_RT_PKT_EEDH: | |
688 | return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, | |
689 | skb, skb->dev, NULL, | |
690 | dn_neigh_endnode_hello); | |
429eb0fa YH |
691 | } |
692 | } else { | |
1da177e4 LT |
693 | if (dn->parms.state != DN_DEV_S_RU) |
694 | goto dump_it; | |
695 | ||
696 | skb_pull(skb, 1); /* Pull flags */ | |
697 | ||
06f8fe11 JP |
698 | switch (flags & DN_RT_PKT_MSK) { |
699 | case DN_RT_PKT_LONG: | |
700 | return dn_route_rx_long(skb); | |
701 | case DN_RT_PKT_SHORT: | |
702 | return dn_route_rx_short(skb); | |
1da177e4 | 703 | } |
429eb0fa | 704 | } |
1da177e4 LT |
705 | |
706 | dump_it: | |
707 | kfree_skb(skb); | |
708 | out: | |
709 | return NET_RX_DROP; | |
710 | } | |
711 | ||
8f40b161 DM |
712 | static int dn_to_neigh_output(struct sk_buff *skb) |
713 | { | |
714 | struct dst_entry *dst = skb_dst(skb); | |
69cce1d1 | 715 | struct neighbour *n = dst_get_neighbour(dst); |
8f40b161 DM |
716 | |
717 | return n->output(n, skb); | |
718 | } | |
719 | ||
1da177e4 LT |
720 | static int dn_output(struct sk_buff *skb) |
721 | { | |
adf30907 | 722 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
723 | struct dn_route *rt = (struct dn_route *)dst; |
724 | struct net_device *dev = dst->dev; | |
725 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
726 | struct neighbour *neigh; | |
727 | ||
728 | int err = -EINVAL; | |
729 | ||
69cce1d1 | 730 | if ((neigh = dst_get_neighbour(dst)) == NULL) |
1da177e4 LT |
731 | goto error; |
732 | ||
733 | skb->dev = dev; | |
734 | ||
735 | cb->src = rt->rt_saddr; | |
736 | cb->dst = rt->rt_daddr; | |
737 | ||
738 | /* | |
739 | * Always set the Intra-Ethernet bit on all outgoing packets | |
740 | * originated on this node. Only valid flag from upper layers | |
741 | * is return-to-sender-requested. Set hop count to 0 too. | |
742 | */ | |
743 | cb->rt_flags &= ~DN_RT_F_RQR; | |
744 | cb->rt_flags |= DN_RT_F_IE; | |
745 | cb->hops = 0; | |
746 | ||
5d877d87 | 747 | return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_OUT, skb, NULL, dev, |
8f40b161 | 748 | dn_to_neigh_output); |
1da177e4 LT |
749 | |
750 | error: | |
751 | if (net_ratelimit()) | |
752 | printk(KERN_DEBUG "dn_output: This should not happen\n"); | |
753 | ||
754 | kfree_skb(skb); | |
755 | ||
756 | return err; | |
757 | } | |
758 | ||
759 | static int dn_forward(struct sk_buff *skb) | |
760 | { | |
761 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
adf30907 | 762 | struct dst_entry *dst = skb_dst(skb); |
fc766e4c | 763 | struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr); |
1da177e4 | 764 | struct dn_route *rt; |
1da177e4 LT |
765 | int header_len; |
766 | #ifdef CONFIG_NETFILTER | |
767 | struct net_device *dev = skb->dev; | |
768 | #endif | |
769 | ||
770 | if (skb->pkt_type != PACKET_HOST) | |
771 | goto drop; | |
772 | ||
773 | /* Ensure that we have enough space for headers */ | |
adf30907 | 774 | rt = (struct dn_route *)skb_dst(skb); |
1da177e4 | 775 | header_len = dn_db->use_long ? 21 : 6; |
d8d1f30b | 776 | if (skb_cow(skb, LL_RESERVED_SPACE(rt->dst.dev)+header_len)) |
1da177e4 LT |
777 | goto drop; |
778 | ||
779 | /* | |
780 | * Hop count exceeded. | |
781 | */ | |
782 | if (++cb->hops > 30) | |
783 | goto drop; | |
784 | ||
d8d1f30b | 785 | skb->dev = rt->dst.dev; |
1da177e4 LT |
786 | |
787 | /* | |
788 | * If packet goes out same interface it came in on, then set | |
789 | * the Intra-Ethernet bit. This has no effect for short | |
790 | * packets, so we don't need to test for them here. | |
791 | */ | |
792 | cb->rt_flags &= ~DN_RT_F_IE; | |
793 | if (rt->rt_flags & RTCF_DOREDIRECT) | |
794 | cb->rt_flags |= DN_RT_F_IE; | |
795 | ||
5d877d87 | 796 | return NF_HOOK(NFPROTO_DECNET, NF_DN_FORWARD, skb, dev, skb->dev, |
8f40b161 | 797 | dn_to_neigh_output); |
1da177e4 LT |
798 | |
799 | drop: | |
800 | kfree_skb(skb); | |
801 | return NET_RX_DROP; | |
802 | } | |
803 | ||
1da177e4 LT |
804 | /* |
805 | * Used to catch bugs. This should never normally get | |
806 | * called. | |
807 | */ | |
808 | static int dn_rt_bug(struct sk_buff *skb) | |
809 | { | |
810 | if (net_ratelimit()) { | |
811 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
812 | ||
813 | printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n", | |
c4106aa8 | 814 | le16_to_cpu(cb->src), le16_to_cpu(cb->dst)); |
1da177e4 LT |
815 | } |
816 | ||
817 | kfree_skb(skb); | |
818 | ||
0e8635a8 | 819 | return NET_RX_DROP; |
1da177e4 LT |
820 | } |
821 | ||
0dbaee3b DM |
822 | static unsigned int dn_dst_default_advmss(const struct dst_entry *dst) |
823 | { | |
824 | return dn_mss_from_pmtu(dst->dev, dst_mtu(dst)); | |
825 | } | |
826 | ||
d33e4553 DM |
827 | static unsigned int dn_dst_default_mtu(const struct dst_entry *dst) |
828 | { | |
829 | return dst->dev->mtu; | |
830 | } | |
831 | ||
d3aaeb38 DM |
832 | static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, const void *daddr) |
833 | { | |
834 | return __neigh_lookup_errno(&dn_neigh_table, daddr, dst->dev); | |
835 | } | |
836 | ||
1da177e4 LT |
837 | static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res) |
838 | { | |
839 | struct dn_fib_info *fi = res->fi; | |
d8d1f30b | 840 | struct net_device *dev = rt->dst.dev; |
62fa8a84 | 841 | unsigned int mss_metric; |
1da177e4 | 842 | struct neighbour *n; |
1da177e4 LT |
843 | |
844 | if (fi) { | |
845 | if (DN_FIB_RES_GW(*res) && | |
846 | DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
847 | rt->rt_gateway = DN_FIB_RES_GW(*res); | |
62fa8a84 | 848 | dst_init_metrics(&rt->dst, fi->fib_metrics, true); |
1da177e4 LT |
849 | } |
850 | rt->rt_type = res->type; | |
851 | ||
69cce1d1 | 852 | if (dev != NULL && dst_get_neighbour(&rt->dst) == NULL) { |
1da177e4 LT |
853 | n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev); |
854 | if (IS_ERR(n)) | |
855 | return PTR_ERR(n); | |
69cce1d1 | 856 | dst_set_neighbour(&rt->dst, n); |
1da177e4 LT |
857 | } |
858 | ||
d33e4553 | 859 | if (dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu) |
defb3519 | 860 | dst_metric_set(&rt->dst, RTAX_MTU, rt->dst.dev->mtu); |
62fa8a84 DM |
861 | mss_metric = dst_metric_raw(&rt->dst, RTAX_ADVMSS); |
862 | if (mss_metric) { | |
0dbaee3b | 863 | unsigned int mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->dst)); |
62fa8a84 | 864 | if (mss_metric > mss) |
0dbaee3b DM |
865 | dst_metric_set(&rt->dst, RTAX_ADVMSS, mss); |
866 | } | |
1da177e4 LT |
867 | return 0; |
868 | } | |
869 | ||
c4ea94ab | 870 | static inline int dn_match_addr(__le16 addr1, __le16 addr2) |
1da177e4 | 871 | { |
c4106aa8 | 872 | __u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(addr2); |
1da177e4 LT |
873 | int match = 16; |
874 | while(tmp) { | |
875 | tmp >>= 1; | |
876 | match--; | |
877 | } | |
878 | return match; | |
879 | } | |
880 | ||
c4ea94ab | 881 | static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope) |
1da177e4 | 882 | { |
c4ea94ab | 883 | __le16 saddr = 0; |
fc766e4c | 884 | struct dn_dev *dn_db; |
1da177e4 LT |
885 | struct dn_ifaddr *ifa; |
886 | int best_match = 0; | |
887 | int ret; | |
888 | ||
fc766e4c ED |
889 | rcu_read_lock(); |
890 | dn_db = rcu_dereference(dev->dn_ptr); | |
891 | for (ifa = rcu_dereference(dn_db->ifa_list); | |
892 | ifa != NULL; | |
893 | ifa = rcu_dereference(ifa->ifa_next)) { | |
1da177e4 LT |
894 | if (ifa->ifa_scope > scope) |
895 | continue; | |
896 | if (!daddr) { | |
897 | saddr = ifa->ifa_local; | |
898 | break; | |
899 | } | |
900 | ret = dn_match_addr(daddr, ifa->ifa_local); | |
901 | if (ret > best_match) | |
902 | saddr = ifa->ifa_local; | |
903 | if (best_match == 0) | |
904 | saddr = ifa->ifa_local; | |
905 | } | |
fc766e4c | 906 | rcu_read_unlock(); |
1da177e4 LT |
907 | |
908 | return saddr; | |
909 | } | |
910 | ||
c4ea94ab | 911 | static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res) |
1da177e4 LT |
912 | { |
913 | return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope); | |
914 | } | |
915 | ||
c4ea94ab | 916 | static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res) |
1da177e4 | 917 | { |
c4ea94ab | 918 | __le16 mask = dnet_make_mask(res->prefixlen); |
1da177e4 LT |
919 | return (daddr&~mask)|res->fi->fib_nh->nh_gw; |
920 | } | |
921 | ||
bef55aeb | 922 | static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *oldflp, int try_hard) |
1da177e4 | 923 | { |
bef55aeb DM |
924 | struct flowidn fld = { |
925 | .daddr = oldflp->daddr, | |
926 | .saddr = oldflp->saddr, | |
927 | .flowidn_scope = RT_SCOPE_UNIVERSE, | |
928 | .flowidn_mark = oldflp->flowidn_mark, | |
929 | .flowidn_iif = init_net.loopback_dev->ifindex, | |
930 | .flowidn_oif = oldflp->flowidn_oif, | |
1d28f42c | 931 | }; |
1da177e4 | 932 | struct dn_route *rt = NULL; |
7562f876 | 933 | struct net_device *dev_out = NULL, *dev; |
1da177e4 LT |
934 | struct neighbour *neigh = NULL; |
935 | unsigned hash; | |
936 | unsigned flags = 0; | |
937 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST }; | |
938 | int err; | |
939 | int free_res = 0; | |
c4ea94ab | 940 | __le16 gateway = 0; |
1da177e4 LT |
941 | |
942 | if (decnet_debug_level & 16) | |
943 | printk(KERN_DEBUG | |
944 | "dn_route_output_slow: dst=%04x src=%04x mark=%d" | |
bef55aeb DM |
945 | " iif=%d oif=%d\n", le16_to_cpu(oldflp->daddr), |
946 | le16_to_cpu(oldflp->saddr), | |
947 | oldflp->flowidn_mark, init_net.loopback_dev->ifindex, | |
948 | oldflp->flowidn_oif); | |
1da177e4 LT |
949 | |
950 | /* If we have an output interface, verify its a DECnet device */ | |
bef55aeb DM |
951 | if (oldflp->flowidn_oif) { |
952 | dev_out = dev_get_by_index(&init_net, oldflp->flowidn_oif); | |
1da177e4 LT |
953 | err = -ENODEV; |
954 | if (dev_out && dev_out->dn_ptr == NULL) { | |
955 | dev_put(dev_out); | |
956 | dev_out = NULL; | |
957 | } | |
958 | if (dev_out == NULL) | |
959 | goto out; | |
960 | } | |
961 | ||
962 | /* If we have a source address, verify that its a local address */ | |
bef55aeb | 963 | if (oldflp->saddr) { |
1da177e4 LT |
964 | err = -EADDRNOTAVAIL; |
965 | ||
966 | if (dev_out) { | |
bef55aeb | 967 | if (dn_dev_islocal(dev_out, oldflp->saddr)) |
1da177e4 LT |
968 | goto source_ok; |
969 | dev_put(dev_out); | |
970 | goto out; | |
971 | } | |
c6d14c84 ED |
972 | rcu_read_lock(); |
973 | for_each_netdev_rcu(&init_net, dev) { | |
7562f876 | 974 | if (!dev->dn_ptr) |
1da177e4 | 975 | continue; |
bef55aeb | 976 | if (!dn_dev_islocal(dev, oldflp->saddr)) |
9bbf28a1 | 977 | continue; |
7562f876 | 978 | if ((dev->flags & IFF_LOOPBACK) && |
bef55aeb DM |
979 | oldflp->daddr && |
980 | !dn_dev_islocal(dev, oldflp->daddr)) | |
9bbf28a1 | 981 | continue; |
7562f876 PE |
982 | |
983 | dev_out = dev; | |
9bbf28a1 | 984 | break; |
1da177e4 | 985 | } |
c6d14c84 | 986 | rcu_read_unlock(); |
1da177e4 LT |
987 | if (dev_out == NULL) |
988 | goto out; | |
989 | dev_hold(dev_out); | |
990 | source_ok: | |
991 | ; | |
992 | } | |
993 | ||
994 | /* No destination? Assume its local */ | |
bef55aeb DM |
995 | if (!fld.daddr) { |
996 | fld.daddr = fld.saddr; | |
1da177e4 LT |
997 | |
998 | err = -EADDRNOTAVAIL; | |
999 | if (dev_out) | |
1000 | dev_put(dev_out); | |
2774c7ab | 1001 | dev_out = init_net.loopback_dev; |
1da177e4 | 1002 | dev_hold(dev_out); |
bef55aeb DM |
1003 | if (!fld.daddr) { |
1004 | fld.daddr = | |
1005 | fld.saddr = dnet_select_source(dev_out, 0, | |
1da177e4 | 1006 | RT_SCOPE_HOST); |
bef55aeb | 1007 | if (!fld.daddr) |
1da177e4 LT |
1008 | goto out; |
1009 | } | |
bef55aeb | 1010 | fld.flowidn_oif = init_net.loopback_dev->ifindex; |
1da177e4 LT |
1011 | res.type = RTN_LOCAL; |
1012 | goto make_route; | |
1013 | } | |
1014 | ||
1015 | if (decnet_debug_level & 16) | |
1016 | printk(KERN_DEBUG | |
1017 | "dn_route_output_slow: initial checks complete." | |
c4ea94ab | 1018 | " dst=%o4x src=%04x oif=%d try_hard=%d\n", |
bef55aeb DM |
1019 | le16_to_cpu(fld.daddr), le16_to_cpu(fld.saddr), |
1020 | fld.flowidn_oif, try_hard); | |
1da177e4 LT |
1021 | |
1022 | /* | |
1023 | * N.B. If the kernel is compiled without router support then | |
1024 | * dn_fib_lookup() will evaluate to non-zero so this if () block | |
1025 | * will always be executed. | |
1026 | */ | |
1027 | err = -ESRCH; | |
bef55aeb | 1028 | if (try_hard || (err = dn_fib_lookup(&fld, &res)) != 0) { |
1da177e4 LT |
1029 | struct dn_dev *dn_db; |
1030 | if (err != -ESRCH) | |
1031 | goto out; | |
1032 | /* | |
429eb0fa | 1033 | * Here the fallback is basically the standard algorithm for |
1da177e4 LT |
1034 | * routing in endnodes which is described in the DECnet routing |
1035 | * docs | |
1036 | * | |
1037 | * If we are not trying hard, look in neighbour cache. | |
1038 | * The result is tested to ensure that if a specific output | |
429eb0fa | 1039 | * device/source address was requested, then we honour that |
1da177e4 LT |
1040 | * here |
1041 | */ | |
1042 | if (!try_hard) { | |
bef55aeb | 1043 | neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fld.daddr); |
1da177e4 | 1044 | if (neigh) { |
bef55aeb DM |
1045 | if ((oldflp->flowidn_oif && |
1046 | (neigh->dev->ifindex != oldflp->flowidn_oif)) || | |
1047 | (oldflp->saddr && | |
1da177e4 | 1048 | (!dn_dev_islocal(neigh->dev, |
bef55aeb | 1049 | oldflp->saddr)))) { |
1da177e4 LT |
1050 | neigh_release(neigh); |
1051 | neigh = NULL; | |
1052 | } else { | |
1053 | if (dev_out) | |
1054 | dev_put(dev_out); | |
bef55aeb | 1055 | if (dn_dev_islocal(neigh->dev, fld.daddr)) { |
2774c7ab | 1056 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1057 | res.type = RTN_LOCAL; |
1058 | } else { | |
1059 | dev_out = neigh->dev; | |
1060 | } | |
1061 | dev_hold(dev_out); | |
1062 | goto select_source; | |
1063 | } | |
1064 | } | |
1065 | } | |
1066 | ||
1067 | /* Not there? Perhaps its a local address */ | |
1068 | if (dev_out == NULL) | |
1069 | dev_out = dn_dev_get_default(); | |
1070 | err = -ENODEV; | |
1071 | if (dev_out == NULL) | |
1072 | goto out; | |
fc766e4c | 1073 | dn_db = rcu_dereference_raw(dev_out->dn_ptr); |
1da177e4 | 1074 | /* Possible improvement - check all devices for local addr */ |
bef55aeb | 1075 | if (dn_dev_islocal(dev_out, fld.daddr)) { |
1da177e4 | 1076 | dev_put(dev_out); |
2774c7ab | 1077 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1078 | dev_hold(dev_out); |
1079 | res.type = RTN_LOCAL; | |
1080 | goto select_source; | |
1081 | } | |
1082 | /* Not local either.... try sending it to the default router */ | |
1083 | neigh = neigh_clone(dn_db->router); | |
1084 | BUG_ON(neigh && neigh->dev != dev_out); | |
1085 | ||
1086 | /* Ok then, we assume its directly connected and move on */ | |
1087 | select_source: | |
1088 | if (neigh) | |
1089 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1090 | if (gateway == 0) | |
bef55aeb DM |
1091 | gateway = fld.daddr; |
1092 | if (fld.saddr == 0) { | |
1093 | fld.saddr = dnet_select_source(dev_out, gateway, | |
1094 | res.type == RTN_LOCAL ? | |
1095 | RT_SCOPE_HOST : | |
1096 | RT_SCOPE_LINK); | |
1097 | if (fld.saddr == 0 && res.type != RTN_LOCAL) | |
1da177e4 LT |
1098 | goto e_addr; |
1099 | } | |
bef55aeb | 1100 | fld.flowidn_oif = dev_out->ifindex; |
1da177e4 LT |
1101 | goto make_route; |
1102 | } | |
1103 | free_res = 1; | |
1104 | ||
1105 | if (res.type == RTN_NAT) | |
1106 | goto e_inval; | |
1107 | ||
1108 | if (res.type == RTN_LOCAL) { | |
bef55aeb DM |
1109 | if (!fld.saddr) |
1110 | fld.saddr = fld.daddr; | |
1da177e4 LT |
1111 | if (dev_out) |
1112 | dev_put(dev_out); | |
2774c7ab | 1113 | dev_out = init_net.loopback_dev; |
1da177e4 | 1114 | dev_hold(dev_out); |
bef55aeb | 1115 | fld.flowidn_oif = dev_out->ifindex; |
1da177e4 LT |
1116 | if (res.fi) |
1117 | dn_fib_info_put(res.fi); | |
1118 | res.fi = NULL; | |
1119 | goto make_route; | |
1120 | } | |
1121 | ||
bef55aeb DM |
1122 | if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0) |
1123 | dn_fib_select_multipath(&fld, &res); | |
1da177e4 | 1124 | |
429eb0fa | 1125 | /* |
1da177e4 LT |
1126 | * We could add some logic to deal with default routes here and |
1127 | * get rid of some of the special casing above. | |
1128 | */ | |
1129 | ||
bef55aeb DM |
1130 | if (!fld.saddr) |
1131 | fld.saddr = DN_FIB_RES_PREFSRC(res); | |
429eb0fa | 1132 | |
1da177e4 LT |
1133 | if (dev_out) |
1134 | dev_put(dev_out); | |
1135 | dev_out = DN_FIB_RES_DEV(res); | |
1136 | dev_hold(dev_out); | |
bef55aeb | 1137 | fld.flowidn_oif = dev_out->ifindex; |
1da177e4 LT |
1138 | gateway = DN_FIB_RES_GW(res); |
1139 | ||
1140 | make_route: | |
1141 | if (dev_out->flags & IFF_LOOPBACK) | |
1142 | flags |= RTCF_LOCAL; | |
1143 | ||
5c1e6aa3 | 1144 | rt = dst_alloc(&dn_dst_ops, dev_out, 1, 0, DST_HOST); |
1da177e4 LT |
1145 | if (rt == NULL) |
1146 | goto e_nobufs; | |
1147 | ||
cf911662 | 1148 | memset(&rt->fld, 0, sizeof(rt->fld)); |
bef55aeb DM |
1149 | rt->fld.saddr = oldflp->saddr; |
1150 | rt->fld.daddr = oldflp->daddr; | |
1151 | rt->fld.flowidn_oif = oldflp->flowidn_oif; | |
1152 | rt->fld.flowidn_iif = 0; | |
1153 | rt->fld.flowidn_mark = oldflp->flowidn_mark; | |
1da177e4 | 1154 | |
bef55aeb DM |
1155 | rt->rt_saddr = fld.saddr; |
1156 | rt->rt_daddr = fld.daddr; | |
1157 | rt->rt_gateway = gateway ? gateway : fld.daddr; | |
1158 | rt->rt_local_src = fld.saddr; | |
1da177e4 | 1159 | |
bef55aeb DM |
1160 | rt->rt_dst_map = fld.daddr; |
1161 | rt->rt_src_map = fld.saddr; | |
1da177e4 | 1162 | |
69cce1d1 | 1163 | dst_set_neighbour(&rt->dst, neigh); |
1da177e4 LT |
1164 | neigh = NULL; |
1165 | ||
d8d1f30b CG |
1166 | rt->dst.lastuse = jiffies; |
1167 | rt->dst.output = dn_output; | |
1168 | rt->dst.input = dn_rt_bug; | |
1da177e4 LT |
1169 | rt->rt_flags = flags; |
1170 | if (flags & RTCF_LOCAL) | |
d8d1f30b | 1171 | rt->dst.input = dn_nsp_rx; |
1da177e4 LT |
1172 | |
1173 | err = dn_rt_set_next_hop(rt, &res); | |
1174 | if (err) | |
1175 | goto e_neighbour; | |
1176 | ||
bef55aeb | 1177 | hash = dn_hash(rt->fld.saddr, rt->fld.daddr); |
1da177e4 LT |
1178 | dn_insert_route(rt, hash, (struct dn_route **)pprt); |
1179 | ||
1180 | done: | |
1181 | if (neigh) | |
1182 | neigh_release(neigh); | |
1183 | if (free_res) | |
1184 | dn_fib_res_put(&res); | |
1185 | if (dev_out) | |
1186 | dev_put(dev_out); | |
1187 | out: | |
1188 | return err; | |
1189 | ||
1190 | e_addr: | |
429eb0fa YH |
1191 | err = -EADDRNOTAVAIL; |
1192 | goto done; | |
1da177e4 LT |
1193 | e_inval: |
1194 | err = -EINVAL; | |
1195 | goto done; | |
1196 | e_nobufs: | |
1197 | err = -ENOBUFS; | |
1198 | goto done; | |
1199 | e_neighbour: | |
d8d1f30b | 1200 | dst_free(&rt->dst); |
1da177e4 LT |
1201 | goto e_nobufs; |
1202 | } | |
1203 | ||
1204 | ||
1205 | /* | |
1206 | * N.B. The flags may be moved into the flowi at some future stage. | |
1207 | */ | |
bef55aeb | 1208 | static int __dn_route_output_key(struct dst_entry **pprt, const struct flowidn *flp, int flags) |
1da177e4 | 1209 | { |
bef55aeb | 1210 | unsigned hash = dn_hash(flp->saddr, flp->daddr); |
1da177e4 LT |
1211 | struct dn_route *rt = NULL; |
1212 | ||
1213 | if (!(flags & MSG_TRYHARD)) { | |
1214 | rcu_read_lock_bh(); | |
a898def2 | 1215 | for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt; |
d8d1f30b | 1216 | rt = rcu_dereference_bh(rt->dst.dn_next)) { |
bef55aeb DM |
1217 | if ((flp->daddr == rt->fld.daddr) && |
1218 | (flp->saddr == rt->fld.saddr) && | |
1219 | (flp->flowidn_mark == rt->fld.flowidn_mark) && | |
c7537967 | 1220 | dn_is_output_route(rt) && |
bef55aeb | 1221 | (rt->fld.flowidn_oif == flp->flowidn_oif)) { |
d8d1f30b | 1222 | dst_use(&rt->dst, jiffies); |
1da177e4 | 1223 | rcu_read_unlock_bh(); |
d8d1f30b | 1224 | *pprt = &rt->dst; |
1da177e4 LT |
1225 | return 0; |
1226 | } | |
1227 | } | |
1228 | rcu_read_unlock_bh(); | |
1229 | } | |
1230 | ||
1231 | return dn_route_output_slow(pprt, flp, flags); | |
1232 | } | |
1233 | ||
bef55aeb | 1234 | static int dn_route_output_key(struct dst_entry **pprt, struct flowidn *flp, int flags) |
1da177e4 LT |
1235 | { |
1236 | int err; | |
1237 | ||
1238 | err = __dn_route_output_key(pprt, flp, flags); | |
bef55aeb DM |
1239 | if (err == 0 && flp->flowidn_proto) { |
1240 | *pprt = xfrm_lookup(&init_net, *pprt, | |
1241 | flowidn_to_flowi(flp), NULL, 0); | |
452edd59 DM |
1242 | if (IS_ERR(*pprt)) { |
1243 | err = PTR_ERR(*pprt); | |
1244 | *pprt = NULL; | |
1245 | } | |
1da177e4 LT |
1246 | } |
1247 | return err; | |
1248 | } | |
1249 | ||
bef55aeb | 1250 | int dn_route_output_sock(struct dst_entry **pprt, struct flowidn *fl, struct sock *sk, int flags) |
1da177e4 LT |
1251 | { |
1252 | int err; | |
1253 | ||
1254 | err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD); | |
bef55aeb | 1255 | if (err == 0 && fl->flowidn_proto) { |
80c0bc9e | 1256 | if (!(flags & MSG_DONTWAIT)) |
bef55aeb DM |
1257 | fl->flowidn_flags |= FLOWI_FLAG_CAN_SLEEP; |
1258 | *pprt = xfrm_lookup(&init_net, *pprt, | |
1259 | flowidn_to_flowi(fl), sk, 0); | |
452edd59 DM |
1260 | if (IS_ERR(*pprt)) { |
1261 | err = PTR_ERR(*pprt); | |
1262 | *pprt = NULL; | |
1263 | } | |
1da177e4 LT |
1264 | } |
1265 | return err; | |
1266 | } | |
1267 | ||
1268 | static int dn_route_input_slow(struct sk_buff *skb) | |
1269 | { | |
1270 | struct dn_route *rt = NULL; | |
1271 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1272 | struct net_device *in_dev = skb->dev; | |
1273 | struct net_device *out_dev = NULL; | |
1274 | struct dn_dev *dn_db; | |
1275 | struct neighbour *neigh = NULL; | |
1276 | unsigned hash; | |
1277 | int flags = 0; | |
c4ea94ab SW |
1278 | __le16 gateway = 0; |
1279 | __le16 local_src = 0; | |
bef55aeb DM |
1280 | struct flowidn fld = { |
1281 | .daddr = cb->dst, | |
1282 | .saddr = cb->src, | |
1283 | .flowidn_scope = RT_SCOPE_UNIVERSE, | |
1284 | .flowidn_mark = skb->mark, | |
1285 | .flowidn_iif = skb->dev->ifindex, | |
1d28f42c | 1286 | }; |
1da177e4 LT |
1287 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE }; |
1288 | int err = -EINVAL; | |
1289 | int free_res = 0; | |
1290 | ||
1291 | dev_hold(in_dev); | |
1292 | ||
fc766e4c | 1293 | if ((dn_db = rcu_dereference(in_dev->dn_ptr)) == NULL) |
1da177e4 LT |
1294 | goto out; |
1295 | ||
1296 | /* Zero source addresses are not allowed */ | |
bef55aeb | 1297 | if (fld.saddr == 0) |
1da177e4 LT |
1298 | goto out; |
1299 | ||
1300 | /* | |
1301 | * In this case we've just received a packet from a source | |
1302 | * outside ourselves pretending to come from us. We don't | |
1303 | * allow it any further to prevent routing loops, spoofing and | |
1304 | * other nasties. Loopback packets already have the dst attached | |
1305 | * so this only affects packets which have originated elsewhere. | |
1306 | */ | |
1307 | err = -ENOTUNIQ; | |
1308 | if (dn_dev_islocal(in_dev, cb->src)) | |
1309 | goto out; | |
1310 | ||
bef55aeb | 1311 | err = dn_fib_lookup(&fld, &res); |
1da177e4 LT |
1312 | if (err) { |
1313 | if (err != -ESRCH) | |
1314 | goto out; | |
1315 | /* | |
1316 | * Is the destination us ? | |
1317 | */ | |
1318 | if (!dn_dev_islocal(in_dev, cb->dst)) | |
1319 | goto e_inval; | |
1320 | ||
1321 | res.type = RTN_LOCAL; | |
1da177e4 | 1322 | } else { |
bef55aeb | 1323 | __le16 src_map = fld.saddr; |
1da177e4 LT |
1324 | free_res = 1; |
1325 | ||
1326 | out_dev = DN_FIB_RES_DEV(res); | |
1327 | if (out_dev == NULL) { | |
1328 | if (net_ratelimit()) | |
1329 | printk(KERN_CRIT "Bug in dn_route_input_slow() " | |
1330 | "No output device\n"); | |
1331 | goto e_inval; | |
1332 | } | |
1333 | dev_hold(out_dev); | |
1334 | ||
1335 | if (res.r) | |
bef55aeb | 1336 | src_map = fld.saddr; /* no NAT support for now */ |
1da177e4 LT |
1337 | |
1338 | gateway = DN_FIB_RES_GW(res); | |
1339 | if (res.type == RTN_NAT) { | |
bef55aeb | 1340 | fld.daddr = dn_fib_rules_map_destination(fld.daddr, &res); |
1da177e4 LT |
1341 | dn_fib_res_put(&res); |
1342 | free_res = 0; | |
bef55aeb | 1343 | if (dn_fib_lookup(&fld, &res)) |
1da177e4 LT |
1344 | goto e_inval; |
1345 | free_res = 1; | |
1346 | if (res.type != RTN_UNICAST) | |
1347 | goto e_inval; | |
1348 | flags |= RTCF_DNAT; | |
bef55aeb | 1349 | gateway = fld.daddr; |
1da177e4 | 1350 | } |
bef55aeb | 1351 | fld.saddr = src_map; |
1da177e4 LT |
1352 | } |
1353 | ||
1354 | switch(res.type) { | |
1355 | case RTN_UNICAST: | |
1356 | /* | |
1357 | * Forwarding check here, we only check for forwarding | |
1358 | * being turned off, if you want to only forward intra | |
1359 | * area, its up to you to set the routing tables up | |
1360 | * correctly. | |
1361 | */ | |
1362 | if (dn_db->parms.forwarding == 0) | |
1363 | goto e_inval; | |
1364 | ||
bef55aeb DM |
1365 | if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0) |
1366 | dn_fib_select_multipath(&fld, &res); | |
1da177e4 | 1367 | |
429eb0fa | 1368 | /* |
1da177e4 LT |
1369 | * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT |
1370 | * flag as a hint to set the intra-ethernet bit when | |
1371 | * forwarding. If we've got NAT in operation, we don't do | |
1372 | * this optimisation. | |
1373 | */ | |
1374 | if (out_dev == in_dev && !(flags & RTCF_NAT)) | |
1375 | flags |= RTCF_DOREDIRECT; | |
1376 | ||
1377 | local_src = DN_FIB_RES_PREFSRC(res); | |
1378 | ||
1379 | case RTN_BLACKHOLE: | |
1380 | case RTN_UNREACHABLE: | |
1381 | break; | |
1382 | case RTN_LOCAL: | |
1383 | flags |= RTCF_LOCAL; | |
bef55aeb DM |
1384 | fld.saddr = cb->dst; |
1385 | fld.daddr = cb->src; | |
1da177e4 LT |
1386 | |
1387 | /* Routing tables gave us a gateway */ | |
1388 | if (gateway) | |
1389 | goto make_route; | |
1390 | ||
1391 | /* Packet was intra-ethernet, so we know its on-link */ | |
3a31b9d2 | 1392 | if (cb->rt_flags & DN_RT_F_IE) { |
1da177e4 LT |
1393 | gateway = cb->src; |
1394 | flags |= RTCF_DIRECTSRC; | |
1395 | goto make_route; | |
1396 | } | |
1397 | ||
1398 | /* Use the default router if there is one */ | |
1399 | neigh = neigh_clone(dn_db->router); | |
1400 | if (neigh) { | |
1401 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1402 | goto make_route; | |
1403 | } | |
1404 | ||
1405 | /* Close eyes and pray */ | |
1406 | gateway = cb->src; | |
1407 | flags |= RTCF_DIRECTSRC; | |
1408 | goto make_route; | |
1409 | default: | |
1410 | goto e_inval; | |
1411 | } | |
1412 | ||
1413 | make_route: | |
5c1e6aa3 | 1414 | rt = dst_alloc(&dn_dst_ops, out_dev, 0, 0, DST_HOST); |
1da177e4 LT |
1415 | if (rt == NULL) |
1416 | goto e_nobufs; | |
1417 | ||
cf911662 | 1418 | memset(&rt->fld, 0, sizeof(rt->fld)); |
bef55aeb DM |
1419 | rt->rt_saddr = fld.saddr; |
1420 | rt->rt_daddr = fld.daddr; | |
1421 | rt->rt_gateway = fld.daddr; | |
1da177e4 LT |
1422 | if (gateway) |
1423 | rt->rt_gateway = gateway; | |
1424 | rt->rt_local_src = local_src ? local_src : rt->rt_saddr; | |
1425 | ||
bef55aeb DM |
1426 | rt->rt_dst_map = fld.daddr; |
1427 | rt->rt_src_map = fld.saddr; | |
1da177e4 | 1428 | |
bef55aeb DM |
1429 | rt->fld.saddr = cb->src; |
1430 | rt->fld.daddr = cb->dst; | |
1431 | rt->fld.flowidn_oif = 0; | |
1432 | rt->fld.flowidn_iif = in_dev->ifindex; | |
1433 | rt->fld.flowidn_mark = fld.flowidn_mark; | |
1da177e4 | 1434 | |
69cce1d1 | 1435 | dst_set_neighbour(&rt->dst, neigh); |
d8d1f30b CG |
1436 | rt->dst.lastuse = jiffies; |
1437 | rt->dst.output = dn_rt_bug; | |
06f8fe11 JP |
1438 | switch (res.type) { |
1439 | case RTN_UNICAST: | |
1440 | rt->dst.input = dn_forward; | |
1441 | break; | |
1442 | case RTN_LOCAL: | |
1443 | rt->dst.output = dn_output; | |
1444 | rt->dst.input = dn_nsp_rx; | |
1445 | rt->dst.dev = in_dev; | |
1446 | flags |= RTCF_LOCAL; | |
1447 | break; | |
1448 | default: | |
1449 | case RTN_UNREACHABLE: | |
1450 | case RTN_BLACKHOLE: | |
1451 | rt->dst.input = dst_discard; | |
1da177e4 LT |
1452 | } |
1453 | rt->rt_flags = flags; | |
1da177e4 LT |
1454 | |
1455 | err = dn_rt_set_next_hop(rt, &res); | |
1456 | if (err) | |
1457 | goto e_neighbour; | |
1458 | ||
bef55aeb | 1459 | hash = dn_hash(rt->fld.saddr, rt->fld.daddr); |
adf30907 | 1460 | dn_insert_route(rt, hash, &rt); |
d8d1f30b | 1461 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
1462 | |
1463 | done: | |
1464 | if (neigh) | |
1465 | neigh_release(neigh); | |
1466 | if (free_res) | |
1467 | dn_fib_res_put(&res); | |
1468 | dev_put(in_dev); | |
1469 | if (out_dev) | |
1470 | dev_put(out_dev); | |
1471 | out: | |
1472 | return err; | |
1473 | ||
1474 | e_inval: | |
1475 | err = -EINVAL; | |
1476 | goto done; | |
1477 | ||
1478 | e_nobufs: | |
1479 | err = -ENOBUFS; | |
1480 | goto done; | |
1481 | ||
1482 | e_neighbour: | |
d8d1f30b | 1483 | dst_free(&rt->dst); |
1da177e4 LT |
1484 | goto done; |
1485 | } | |
1486 | ||
5eaa65b2 | 1487 | static int dn_route_input(struct sk_buff *skb) |
1da177e4 LT |
1488 | { |
1489 | struct dn_route *rt; | |
1490 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1491 | unsigned hash = dn_hash(cb->src, cb->dst); | |
1492 | ||
adf30907 | 1493 | if (skb_dst(skb)) |
1da177e4 LT |
1494 | return 0; |
1495 | ||
1496 | rcu_read_lock(); | |
1497 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL; | |
d8d1f30b | 1498 | rt = rcu_dereference(rt->dst.dn_next)) { |
bef55aeb DM |
1499 | if ((rt->fld.saddr == cb->src) && |
1500 | (rt->fld.daddr == cb->dst) && | |
1501 | (rt->fld.flowidn_oif == 0) && | |
1502 | (rt->fld.flowidn_mark == skb->mark) && | |
1503 | (rt->fld.flowidn_iif == cb->iif)) { | |
d8d1f30b | 1504 | dst_use(&rt->dst, jiffies); |
1da177e4 | 1505 | rcu_read_unlock(); |
adf30907 | 1506 | skb_dst_set(skb, (struct dst_entry *)rt); |
1da177e4 LT |
1507 | return 0; |
1508 | } | |
1509 | } | |
1510 | rcu_read_unlock(); | |
1511 | ||
1512 | return dn_route_input_slow(skb); | |
1513 | } | |
1514 | ||
b6544c0b JHS |
1515 | static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
1516 | int event, int nowait, unsigned int flags) | |
1da177e4 | 1517 | { |
adf30907 | 1518 | struct dn_route *rt = (struct dn_route *)skb_dst(skb); |
1da177e4 LT |
1519 | struct rtmsg *r; |
1520 | struct nlmsghdr *nlh; | |
27a884dc | 1521 | unsigned char *b = skb_tail_pointer(skb); |
e3703b3d | 1522 | long expires; |
1da177e4 | 1523 | |
b6544c0b | 1524 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); |
1da177e4 | 1525 | r = NLMSG_DATA(nlh); |
1da177e4 LT |
1526 | r->rtm_family = AF_DECnet; |
1527 | r->rtm_dst_len = 16; | |
1528 | r->rtm_src_len = 0; | |
1529 | r->rtm_tos = 0; | |
1530 | r->rtm_table = RT_TABLE_MAIN; | |
9e762a4a | 1531 | RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1da177e4 LT |
1532 | r->rtm_type = rt->rt_type; |
1533 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
1534 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
1535 | r->rtm_protocol = RTPROT_UNSPEC; | |
1536 | if (rt->rt_flags & RTCF_NOTIFY) | |
1537 | r->rtm_flags |= RTM_F_NOTIFY; | |
1538 | RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr); | |
bef55aeb | 1539 | if (rt->fld.saddr) { |
1da177e4 | 1540 | r->rtm_src_len = 16; |
bef55aeb | 1541 | RTA_PUT(skb, RTA_SRC, 2, &rt->fld.saddr); |
1da177e4 | 1542 | } |
d8d1f30b CG |
1543 | if (rt->dst.dev) |
1544 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->dst.dev->ifindex); | |
1da177e4 LT |
1545 | /* |
1546 | * Note to self - change this if input routes reverse direction when | |
1547 | * they deal only with inputs and not with replies like they do | |
1548 | * currently. | |
1549 | */ | |
1550 | RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src); | |
1551 | if (rt->rt_daddr != rt->rt_gateway) | |
1552 | RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway); | |
defb3519 | 1553 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
1da177e4 | 1554 | goto rtattr_failure; |
d8d1f30b CG |
1555 | expires = rt->dst.expires ? rt->dst.expires - jiffies : 0; |
1556 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0, expires, | |
1557 | rt->dst.error) < 0) | |
e3703b3d | 1558 | goto rtattr_failure; |
c7537967 | 1559 | if (dn_is_input_route(rt)) |
bef55aeb | 1560 | RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fld.flowidn_iif); |
1da177e4 | 1561 | |
27a884dc | 1562 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1563 | return skb->len; |
1564 | ||
1565 | nlmsg_failure: | |
1566 | rtattr_failure: | |
dc5fc579 | 1567 | nlmsg_trim(skb, b); |
429eb0fa | 1568 | return -1; |
1da177e4 LT |
1569 | } |
1570 | ||
1571 | /* | |
1572 | * This is called by both endnodes and routers now. | |
1573 | */ | |
fa34ddd7 | 1574 | static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 1575 | { |
3b1e0a65 | 1576 | struct net *net = sock_net(in_skb->sk); |
1da177e4 LT |
1577 | struct rtattr **rta = arg; |
1578 | struct rtmsg *rtm = NLMSG_DATA(nlh); | |
1579 | struct dn_route *rt = NULL; | |
1580 | struct dn_skb_cb *cb; | |
1581 | int err; | |
1582 | struct sk_buff *skb; | |
bef55aeb | 1583 | struct flowidn fld; |
1da177e4 | 1584 | |
09ad9bc7 | 1585 | if (!net_eq(net, &init_net)) |
b854272b DL |
1586 | return -EINVAL; |
1587 | ||
bef55aeb DM |
1588 | memset(&fld, 0, sizeof(fld)); |
1589 | fld.flowidn_proto = DNPROTO_NSP; | |
1da177e4 LT |
1590 | |
1591 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1592 | if (skb == NULL) | |
1593 | return -ENOBUFS; | |
459a98ed | 1594 | skb_reset_mac_header(skb); |
1da177e4 LT |
1595 | cb = DN_SKB_CB(skb); |
1596 | ||
1597 | if (rta[RTA_SRC-1]) | |
bef55aeb | 1598 | memcpy(&fld.saddr, RTA_DATA(rta[RTA_SRC-1]), 2); |
1da177e4 | 1599 | if (rta[RTA_DST-1]) |
bef55aeb | 1600 | memcpy(&fld.daddr, RTA_DATA(rta[RTA_DST-1]), 2); |
1da177e4 | 1601 | if (rta[RTA_IIF-1]) |
bef55aeb | 1602 | memcpy(&fld.flowidn_iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); |
1da177e4 | 1603 | |
bef55aeb | 1604 | if (fld.flowidn_iif) { |
1da177e4 | 1605 | struct net_device *dev; |
bef55aeb | 1606 | if ((dev = dev_get_by_index(&init_net, fld.flowidn_iif)) == NULL) { |
1da177e4 LT |
1607 | kfree_skb(skb); |
1608 | return -ENODEV; | |
1609 | } | |
1610 | if (!dev->dn_ptr) { | |
1611 | dev_put(dev); | |
1612 | kfree_skb(skb); | |
1613 | return -ENODEV; | |
1614 | } | |
b98999dc | 1615 | skb->protocol = htons(ETH_P_DNA_RT); |
1da177e4 | 1616 | skb->dev = dev; |
bef55aeb DM |
1617 | cb->src = fld.saddr; |
1618 | cb->dst = fld.daddr; | |
1da177e4 LT |
1619 | local_bh_disable(); |
1620 | err = dn_route_input(skb); | |
1621 | local_bh_enable(); | |
1622 | memset(cb, 0, sizeof(struct dn_skb_cb)); | |
adf30907 | 1623 | rt = (struct dn_route *)skb_dst(skb); |
d8d1f30b CG |
1624 | if (!err && -rt->dst.error) |
1625 | err = rt->dst.error; | |
1da177e4 LT |
1626 | } else { |
1627 | int oif = 0; | |
1628 | if (rta[RTA_OIF - 1]) | |
1629 | memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int)); | |
bef55aeb DM |
1630 | fld.flowidn_oif = oif; |
1631 | err = dn_route_output_key((struct dst_entry **)&rt, &fld, 0); | |
1da177e4 LT |
1632 | } |
1633 | ||
1634 | if (skb->dev) | |
1635 | dev_put(skb->dev); | |
1636 | skb->dev = NULL; | |
1637 | if (err) | |
1638 | goto out_free; | |
d8d1f30b | 1639 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
1640 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
1641 | rt->rt_flags |= RTCF_NOTIFY; | |
1642 | ||
b6544c0b | 1643 | err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0); |
1da177e4 LT |
1644 | |
1645 | if (err == 0) | |
1646 | goto out_free; | |
1647 | if (err < 0) { | |
1648 | err = -EMSGSIZE; | |
1649 | goto out_free; | |
1650 | } | |
1651 | ||
97c53cac | 1652 | return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
1da177e4 LT |
1653 | |
1654 | out_free: | |
1655 | kfree_skb(skb); | |
1656 | return err; | |
1657 | } | |
1658 | ||
1659 | /* | |
1660 | * For routers, this is called from dn_fib_dump, but for endnodes its | |
1661 | * called directly from the rtnetlink dispatch table. | |
1662 | */ | |
1663 | int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1664 | { | |
3b1e0a65 | 1665 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1666 | struct dn_route *rt; |
1667 | int h, s_h; | |
1668 | int idx, s_idx; | |
1669 | ||
09ad9bc7 | 1670 | if (!net_eq(net, &init_net)) |
b854272b DL |
1671 | return 0; |
1672 | ||
1da177e4 LT |
1673 | if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg)) |
1674 | return -EINVAL; | |
1675 | if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)) | |
1676 | return 0; | |
1677 | ||
1678 | s_h = cb->args[0]; | |
1679 | s_idx = idx = cb->args[1]; | |
1680 | for(h = 0; h <= dn_rt_hash_mask; h++) { | |
1681 | if (h < s_h) | |
1682 | continue; | |
1683 | if (h > s_h) | |
1684 | s_idx = 0; | |
1685 | rcu_read_lock_bh(); | |
a898def2 | 1686 | for(rt = rcu_dereference_bh(dn_rt_hash_table[h].chain), idx = 0; |
1da177e4 | 1687 | rt; |
d8d1f30b | 1688 | rt = rcu_dereference_bh(rt->dst.dn_next), idx++) { |
1da177e4 LT |
1689 | if (idx < s_idx) |
1690 | continue; | |
d8d1f30b | 1691 | skb_dst_set(skb, dst_clone(&rt->dst)); |
1da177e4 | 1692 | if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid, |
429eb0fa | 1693 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 1694 | 1, NLM_F_MULTI) <= 0) { |
adf30907 | 1695 | skb_dst_drop(skb); |
1da177e4 LT |
1696 | rcu_read_unlock_bh(); |
1697 | goto done; | |
1698 | } | |
adf30907 | 1699 | skb_dst_drop(skb); |
1da177e4 LT |
1700 | } |
1701 | rcu_read_unlock_bh(); | |
1702 | } | |
1703 | ||
1704 | done: | |
1705 | cb->args[0] = h; | |
1706 | cb->args[1] = idx; | |
1707 | return skb->len; | |
1708 | } | |
1709 | ||
1710 | #ifdef CONFIG_PROC_FS | |
1711 | struct dn_rt_cache_iter_state { | |
1712 | int bucket; | |
1713 | }; | |
1714 | ||
1715 | static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq) | |
1716 | { | |
1717 | struct dn_route *rt = NULL; | |
1718 | struct dn_rt_cache_iter_state *s = seq->private; | |
1719 | ||
1720 | for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) { | |
1721 | rcu_read_lock_bh(); | |
a898def2 | 1722 | rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); |
1da177e4 LT |
1723 | if (rt) |
1724 | break; | |
1725 | rcu_read_unlock_bh(); | |
1726 | } | |
a898def2 | 1727 | return rt; |
1da177e4 LT |
1728 | } |
1729 | ||
1730 | static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt) | |
1731 | { | |
0d89d794 | 1732 | struct dn_rt_cache_iter_state *s = seq->private; |
1da177e4 | 1733 | |
fc766e4c ED |
1734 | rt = rcu_dereference_bh(rt->dst.dn_next); |
1735 | while (!rt) { | |
1da177e4 LT |
1736 | rcu_read_unlock_bh(); |
1737 | if (--s->bucket < 0) | |
1738 | break; | |
1739 | rcu_read_lock_bh(); | |
fc766e4c | 1740 | rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); |
1da177e4 | 1741 | } |
fc766e4c | 1742 | return rt; |
1da177e4 LT |
1743 | } |
1744 | ||
1745 | static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
1746 | { | |
1747 | struct dn_route *rt = dn_rt_cache_get_first(seq); | |
1748 | ||
1749 | if (rt) { | |
1750 | while(*pos && (rt = dn_rt_cache_get_next(seq, rt))) | |
1751 | --*pos; | |
1752 | } | |
1753 | return *pos ? NULL : rt; | |
1754 | } | |
1755 | ||
1756 | static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1757 | { | |
1758 | struct dn_route *rt = dn_rt_cache_get_next(seq, v); | |
1759 | ++*pos; | |
1760 | return rt; | |
1761 | } | |
1762 | ||
1763 | static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v) | |
1764 | { | |
1765 | if (v) | |
1766 | rcu_read_unlock_bh(); | |
1767 | } | |
1768 | ||
1769 | static int dn_rt_cache_seq_show(struct seq_file *seq, void *v) | |
1770 | { | |
1771 | struct dn_route *rt = v; | |
1772 | char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN]; | |
1773 | ||
1774 | seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n", | |
d8d1f30b | 1775 | rt->dst.dev ? rt->dst.dev->name : "*", |
c4106aa8 HH |
1776 | dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1), |
1777 | dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2), | |
d8d1f30b CG |
1778 | atomic_read(&rt->dst.__refcnt), |
1779 | rt->dst.__use, | |
1780 | (int) dst_metric(&rt->dst, RTAX_RTT)); | |
1da177e4 | 1781 | return 0; |
429eb0fa | 1782 | } |
1da177e4 | 1783 | |
56b3d975 | 1784 | static const struct seq_operations dn_rt_cache_seq_ops = { |
1da177e4 LT |
1785 | .start = dn_rt_cache_seq_start, |
1786 | .next = dn_rt_cache_seq_next, | |
1787 | .stop = dn_rt_cache_seq_stop, | |
1788 | .show = dn_rt_cache_seq_show, | |
1789 | }; | |
1790 | ||
1791 | static int dn_rt_cache_seq_open(struct inode *inode, struct file *file) | |
1792 | { | |
31164088 PE |
1793 | return seq_open_private(file, &dn_rt_cache_seq_ops, |
1794 | sizeof(struct dn_rt_cache_iter_state)); | |
1da177e4 LT |
1795 | } |
1796 | ||
9a32144e | 1797 | static const struct file_operations dn_rt_cache_seq_fops = { |
1da177e4 LT |
1798 | .owner = THIS_MODULE, |
1799 | .open = dn_rt_cache_seq_open, | |
1800 | .read = seq_read, | |
1801 | .llseek = seq_lseek, | |
1802 | .release = seq_release_private, | |
1803 | }; | |
1804 | ||
1805 | #endif /* CONFIG_PROC_FS */ | |
1806 | ||
1807 | void __init dn_route_init(void) | |
1808 | { | |
1809 | int i, goal, order; | |
1810 | ||
e5d679f3 AD |
1811 | dn_dst_ops.kmem_cachep = |
1812 | kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0, | |
20c2df83 | 1813 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
fc66f95c | 1814 | dst_entries_init(&dn_dst_ops); |
b24b8a24 | 1815 | setup_timer(&dn_route_timer, dn_dst_check_expire, 0); |
1da177e4 LT |
1816 | dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; |
1817 | add_timer(&dn_route_timer); | |
1818 | ||
4481374c | 1819 | goal = totalram_pages >> (26 - PAGE_SHIFT); |
1da177e4 LT |
1820 | |
1821 | for(order = 0; (1UL << order) < goal; order++) | |
1822 | /* NOTHING */; | |
1823 | ||
429eb0fa YH |
1824 | /* |
1825 | * Only want 1024 entries max, since the table is very, very unlikely | |
1826 | * to be larger than that. | |
1827 | */ | |
1828 | while(order && ((((1UL << order) * PAGE_SIZE) / | |
1829 | sizeof(struct dn_rt_hash_bucket)) >= 2048)) | |
1830 | order--; | |
1831 | ||
1832 | do { | |
1833 | dn_rt_hash_mask = (1UL << order) * PAGE_SIZE / | |
1834 | sizeof(struct dn_rt_hash_bucket); | |
1835 | while(dn_rt_hash_mask & (dn_rt_hash_mask - 1)) | |
1836 | dn_rt_hash_mask--; | |
1837 | dn_rt_hash_table = (struct dn_rt_hash_bucket *) | |
1838 | __get_free_pages(GFP_ATOMIC, order); | |
1839 | } while (dn_rt_hash_table == NULL && --order > 0); | |
1da177e4 LT |
1840 | |
1841 | if (!dn_rt_hash_table) | |
429eb0fa | 1842 | panic("Failed to allocate DECnet route cache hash table\n"); |
1da177e4 | 1843 | |
429eb0fa YH |
1844 | printk(KERN_INFO |
1845 | "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n", | |
1846 | dn_rt_hash_mask, | |
1da177e4 LT |
1847 | (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024); |
1848 | ||
1849 | dn_rt_hash_mask--; | |
429eb0fa YH |
1850 | for(i = 0; i <= dn_rt_hash_mask; i++) { |
1851 | spin_lock_init(&dn_rt_hash_table[i].lock); | |
1852 | dn_rt_hash_table[i].chain = NULL; | |
1853 | } | |
1da177e4 | 1854 | |
429eb0fa | 1855 | dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1); |
1da177e4 | 1856 | |
457c4cbc | 1857 | proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops); |
fa34ddd7 TG |
1858 | |
1859 | #ifdef CONFIG_DECNET_ROUTER | |
c7ac8679 GR |
1860 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, |
1861 | dn_fib_dump, NULL); | |
fa34ddd7 TG |
1862 | #else |
1863 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, | |
c7ac8679 | 1864 | dn_cache_dump, NULL); |
fa34ddd7 | 1865 | #endif |
1da177e4 LT |
1866 | } |
1867 | ||
1868 | void __exit dn_route_cleanup(void) | |
1869 | { | |
1870 | del_timer(&dn_route_timer); | |
1871 | dn_run_flush(0); | |
1872 | ||
457c4cbc | 1873 | proc_net_remove(&init_net, "decnet_cache"); |
fc66f95c | 1874 | dst_entries_destroy(&dn_dst_ops); |
1da177e4 LT |
1875 | } |
1876 |