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); | |
119 | static int dn_route_input(struct sk_buff *); | |
120 | static void dn_run_flush(unsigned long dummy); | |
121 | ||
122 | static struct dn_rt_hash_bucket *dn_rt_hash_table; | |
123 | static unsigned dn_rt_hash_mask; | |
124 | ||
125 | static struct timer_list dn_route_timer; | |
8d06afab | 126 | static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0); |
1da177e4 LT |
127 | int decnet_dst_gc_interval = 2; |
128 | ||
129 | static struct dst_ops dn_dst_ops = { | |
130 | .family = PF_DECnet, | |
09640e63 | 131 | .protocol = cpu_to_be16(ETH_P_DNA_RT), |
1da177e4 LT |
132 | .gc_thresh = 128, |
133 | .gc = dn_dst_gc, | |
134 | .check = dn_dst_check, | |
0dbaee3b | 135 | .default_advmss = dn_dst_default_advmss, |
d33e4553 | 136 | .default_mtu = dn_dst_default_mtu, |
62fa8a84 DM |
137 | .cow_metrics = dst_cow_metrics_generic, |
138 | .destroy = dn_dst_destroy, | |
1da177e4 LT |
139 | .negative_advice = dn_dst_negative_advice, |
140 | .link_failure = dn_dst_link_failure, | |
141 | .update_pmtu = dn_dst_update_pmtu, | |
1da177e4 LT |
142 | }; |
143 | ||
62fa8a84 DM |
144 | static void dn_dst_destroy(struct dst_entry *dst) |
145 | { | |
146 | dst_destroy_metrics_generic(dst); | |
147 | } | |
148 | ||
c4ea94ab | 149 | static __inline__ unsigned dn_hash(__le16 src, __le16 dst) |
1da177e4 | 150 | { |
c4ea94ab | 151 | __u16 tmp = (__u16 __force)(src ^ dst); |
1da177e4 LT |
152 | tmp ^= (tmp >> 3); |
153 | tmp ^= (tmp >> 5); | |
154 | tmp ^= (tmp >> 10); | |
155 | return dn_rt_hash_mask & (unsigned)tmp; | |
156 | } | |
157 | ||
158 | static inline void dnrt_free(struct dn_route *rt) | |
159 | { | |
d8d1f30b | 160 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); |
1da177e4 LT |
161 | } |
162 | ||
163 | static inline void dnrt_drop(struct dn_route *rt) | |
164 | { | |
d8d1f30b CG |
165 | dst_release(&rt->dst); |
166 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); | |
1da177e4 LT |
167 | } |
168 | ||
169 | static void dn_dst_check_expire(unsigned long dummy) | |
170 | { | |
171 | int i; | |
fc766e4c ED |
172 | struct dn_route *rt; |
173 | struct dn_route __rcu **rtp; | |
1da177e4 LT |
174 | unsigned long now = jiffies; |
175 | unsigned long expire = 120 * HZ; | |
176 | ||
fc766e4c | 177 | for (i = 0; i <= dn_rt_hash_mask; i++) { |
1da177e4 LT |
178 | rtp = &dn_rt_hash_table[i].chain; |
179 | ||
180 | spin_lock(&dn_rt_hash_table[i].lock); | |
fc766e4c ED |
181 | while ((rt = rcu_dereference_protected(*rtp, |
182 | lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) { | |
d8d1f30b CG |
183 | if (atomic_read(&rt->dst.__refcnt) || |
184 | (now - rt->dst.lastuse) < expire) { | |
185 | rtp = &rt->dst.dn_next; | |
1da177e4 LT |
186 | continue; |
187 | } | |
d8d1f30b CG |
188 | *rtp = rt->dst.dn_next; |
189 | rt->dst.dn_next = NULL; | |
1da177e4 LT |
190 | dnrt_free(rt); |
191 | } | |
192 | spin_unlock(&dn_rt_hash_table[i].lock); | |
193 | ||
194 | if ((jiffies - now) > 0) | |
195 | break; | |
196 | } | |
197 | ||
198 | mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ); | |
199 | } | |
200 | ||
569d3645 | 201 | static int dn_dst_gc(struct dst_ops *ops) |
1da177e4 | 202 | { |
fc766e4c ED |
203 | struct dn_route *rt; |
204 | struct dn_route __rcu **rtp; | |
1da177e4 LT |
205 | int i; |
206 | unsigned long now = jiffies; | |
207 | unsigned long expire = 10 * HZ; | |
208 | ||
fc766e4c | 209 | for (i = 0; i <= dn_rt_hash_mask; i++) { |
1da177e4 LT |
210 | |
211 | spin_lock_bh(&dn_rt_hash_table[i].lock); | |
212 | rtp = &dn_rt_hash_table[i].chain; | |
213 | ||
fc766e4c ED |
214 | while ((rt = rcu_dereference_protected(*rtp, |
215 | lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) { | |
d8d1f30b CG |
216 | if (atomic_read(&rt->dst.__refcnt) || |
217 | (now - rt->dst.lastuse) < expire) { | |
218 | rtp = &rt->dst.dn_next; | |
1da177e4 LT |
219 | continue; |
220 | } | |
d8d1f30b CG |
221 | *rtp = rt->dst.dn_next; |
222 | rt->dst.dn_next = NULL; | |
1da177e4 LT |
223 | dnrt_drop(rt); |
224 | break; | |
225 | } | |
226 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
227 | } | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
232 | /* | |
233 | * The decnet standards don't impose a particular minimum mtu, what they | |
234 | * do insist on is that the routing layer accepts a datagram of at least | |
235 | * 230 bytes long. Here we have to subtract the routing header length from | |
236 | * 230 to get the minimum acceptable mtu. If there is no neighbour, then we | |
237 | * assume the worst and use a long header size. | |
238 | * | |
239 | * We update both the mtu and the advertised mss (i.e. the segment size we | |
240 | * advertise to the other end). | |
241 | */ | |
242 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu) | |
243 | { | |
244 | u32 min_mtu = 230; | |
245 | struct dn_dev *dn = dst->neighbour ? | |
fc766e4c | 246 | rcu_dereference_raw(dst->neighbour->dev->dn_ptr) : NULL; |
1da177e4 LT |
247 | |
248 | if (dn && dn->use_long == 0) | |
249 | min_mtu -= 6; | |
250 | else | |
251 | min_mtu -= 21; | |
252 | ||
5ffc02a1 | 253 | if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= min_mtu) { |
1da177e4 | 254 | if (!(dst_metric_locked(dst, RTAX_MTU))) { |
defb3519 | 255 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
256 | dst_set_expires(dst, dn_rt_mtu_expires); |
257 | } | |
258 | if (!(dst_metric_locked(dst, RTAX_ADVMSS))) { | |
259 | u32 mss = mtu - DN_MAX_NSP_DATA_HEADER; | |
0dbaee3b DM |
260 | u32 existing_mss = dst_metric_raw(dst, RTAX_ADVMSS); |
261 | if (!existing_mss || existing_mss > mss) | |
defb3519 | 262 | dst_metric_set(dst, RTAX_ADVMSS, mss); |
1da177e4 LT |
263 | } |
264 | } | |
265 | } | |
266 | ||
429eb0fa | 267 | /* |
1da177e4 LT |
268 | * When a route has been marked obsolete. (e.g. routing cache flush) |
269 | */ | |
270 | static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie) | |
271 | { | |
272 | return NULL; | |
273 | } | |
274 | ||
275 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst) | |
276 | { | |
277 | dst_release(dst); | |
278 | return NULL; | |
279 | } | |
280 | ||
281 | static void dn_dst_link_failure(struct sk_buff *skb) | |
282 | { | |
1da177e4 LT |
283 | } |
284 | ||
bef55aeb | 285 | static inline int compare_keys(struct flowidn *fl1, struct flowidn *fl2) |
1da177e4 | 286 | { |
bef55aeb DM |
287 | return ((fl1->daddr ^ fl2->daddr) | |
288 | (fl1->saddr ^ fl2->saddr) | | |
289 | (fl1->flowidn_mark ^ fl2->flowidn_mark) | | |
290 | (fl1->flowidn_scope ^ fl2->flowidn_scope) | | |
291 | (fl1->flowidn_oif ^ fl2->flowidn_oif) | | |
292 | (fl1->flowidn_iif ^ fl2->flowidn_iif)) == 0; | |
1da177e4 LT |
293 | } |
294 | ||
295 | static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp) | |
296 | { | |
fc766e4c ED |
297 | struct dn_route *rth; |
298 | struct dn_route __rcu **rthp; | |
1da177e4 LT |
299 | unsigned long now = jiffies; |
300 | ||
301 | rthp = &dn_rt_hash_table[hash].chain; | |
302 | ||
303 | spin_lock_bh(&dn_rt_hash_table[hash].lock); | |
fc766e4c ED |
304 | while ((rth = rcu_dereference_protected(*rthp, |
305 | lockdep_is_held(&dn_rt_hash_table[hash].lock))) != NULL) { | |
bef55aeb | 306 | if (compare_keys(&rth->fld, &rt->fld)) { |
1da177e4 | 307 | /* Put it first */ |
d8d1f30b CG |
308 | *rthp = rth->dst.dn_next; |
309 | rcu_assign_pointer(rth->dst.dn_next, | |
1da177e4 LT |
310 | dn_rt_hash_table[hash].chain); |
311 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth); | |
312 | ||
d8d1f30b | 313 | dst_use(&rth->dst, now); |
1da177e4 LT |
314 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
315 | ||
316 | dnrt_drop(rt); | |
317 | *rp = rth; | |
318 | return 0; | |
319 | } | |
d8d1f30b | 320 | rthp = &rth->dst.dn_next; |
1da177e4 LT |
321 | } |
322 | ||
d8d1f30b | 323 | rcu_assign_pointer(rt->dst.dn_next, dn_rt_hash_table[hash].chain); |
1da177e4 | 324 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt); |
429eb0fa | 325 | |
d8d1f30b | 326 | dst_use(&rt->dst, now); |
1da177e4 LT |
327 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
328 | *rp = rt; | |
329 | return 0; | |
330 | } | |
331 | ||
5eaa65b2 | 332 | static void dn_run_flush(unsigned long dummy) |
1da177e4 LT |
333 | { |
334 | int i; | |
335 | struct dn_route *rt, *next; | |
336 | ||
fc766e4c | 337 | for (i = 0; i < dn_rt_hash_mask; i++) { |
1da177e4 LT |
338 | spin_lock_bh(&dn_rt_hash_table[i].lock); |
339 | ||
fc766e4c | 340 | if ((rt = xchg((struct dn_route **)&dn_rt_hash_table[i].chain, NULL)) == NULL) |
1da177e4 LT |
341 | goto nothing_to_declare; |
342 | ||
fc766e4c ED |
343 | for(; rt; rt = next) { |
344 | next = rcu_dereference_raw(rt->dst.dn_next); | |
345 | RCU_INIT_POINTER(rt->dst.dn_next, NULL); | |
1da177e4 LT |
346 | dst_free((struct dst_entry *)rt); |
347 | } | |
348 | ||
349 | nothing_to_declare: | |
350 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
351 | } | |
352 | } | |
353 | ||
354 | static DEFINE_SPINLOCK(dn_rt_flush_lock); | |
355 | ||
356 | void dn_rt_cache_flush(int delay) | |
357 | { | |
358 | unsigned long now = jiffies; | |
359 | int user_mode = !in_interrupt(); | |
360 | ||
361 | if (delay < 0) | |
362 | delay = dn_rt_min_delay; | |
363 | ||
364 | spin_lock_bh(&dn_rt_flush_lock); | |
365 | ||
366 | if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) { | |
367 | long tmo = (long)(dn_rt_deadline - now); | |
368 | ||
369 | if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay) | |
370 | tmo = 0; | |
371 | ||
372 | if (delay > tmo) | |
373 | delay = tmo; | |
374 | } | |
375 | ||
376 | if (delay <= 0) { | |
377 | spin_unlock_bh(&dn_rt_flush_lock); | |
378 | dn_run_flush(0); | |
379 | return; | |
380 | } | |
381 | ||
382 | if (dn_rt_deadline == 0) | |
383 | dn_rt_deadline = now + dn_rt_max_delay; | |
384 | ||
385 | dn_rt_flush_timer.expires = now + delay; | |
386 | add_timer(&dn_rt_flush_timer); | |
387 | spin_unlock_bh(&dn_rt_flush_lock); | |
388 | } | |
389 | ||
390 | /** | |
391 | * dn_return_short - Return a short packet to its sender | |
392 | * @skb: The packet to return | |
393 | * | |
394 | */ | |
395 | static int dn_return_short(struct sk_buff *skb) | |
396 | { | |
397 | struct dn_skb_cb *cb; | |
398 | unsigned char *ptr; | |
c4ea94ab SW |
399 | __le16 *src; |
400 | __le16 *dst; | |
1da177e4 LT |
401 | |
402 | /* Add back headers */ | |
d56f90a7 | 403 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
404 | |
405 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) | |
406 | return NET_RX_DROP; | |
407 | ||
408 | cb = DN_SKB_CB(skb); | |
409 | /* Skip packet length and point to flags */ | |
410 | ptr = skb->data + 2; | |
411 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; | |
412 | ||
c4ea94ab | 413 | dst = (__le16 *)ptr; |
1da177e4 | 414 | ptr += 2; |
c4ea94ab | 415 | src = (__le16 *)ptr; |
1da177e4 LT |
416 | ptr += 2; |
417 | *ptr = 0; /* Zero hop count */ | |
418 | ||
a0bffffc | 419 | swap(*src, *dst); |
1da177e4 LT |
420 | |
421 | skb->pkt_type = PACKET_OUTGOING; | |
422 | dn_rt_finish_output(skb, NULL, NULL); | |
423 | return NET_RX_SUCCESS; | |
424 | } | |
425 | ||
426 | /** | |
427 | * dn_return_long - Return a long packet to its sender | |
428 | * @skb: The long format packet to return | |
429 | * | |
430 | */ | |
431 | static int dn_return_long(struct sk_buff *skb) | |
432 | { | |
433 | struct dn_skb_cb *cb; | |
434 | unsigned char *ptr; | |
435 | unsigned char *src_addr, *dst_addr; | |
436 | unsigned char tmp[ETH_ALEN]; | |
437 | ||
438 | /* Add back all headers */ | |
d56f90a7 | 439 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
440 | |
441 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) | |
442 | return NET_RX_DROP; | |
443 | ||
444 | cb = DN_SKB_CB(skb); | |
445 | /* Ignore packet length and point to flags */ | |
446 | ptr = skb->data + 2; | |
447 | ||
448 | /* Skip padding */ | |
449 | if (*ptr & DN_RT_F_PF) { | |
450 | char padlen = (*ptr & ~DN_RT_F_PF); | |
451 | ptr += padlen; | |
452 | } | |
453 | ||
454 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; | |
455 | ptr += 2; | |
456 | dst_addr = ptr; | |
457 | ptr += 8; | |
458 | src_addr = ptr; | |
459 | ptr += 6; | |
460 | *ptr = 0; /* Zero hop count */ | |
461 | ||
462 | /* Swap source and destination */ | |
463 | memcpy(tmp, src_addr, ETH_ALEN); | |
464 | memcpy(src_addr, dst_addr, ETH_ALEN); | |
465 | memcpy(dst_addr, tmp, ETH_ALEN); | |
466 | ||
467 | skb->pkt_type = PACKET_OUTGOING; | |
468 | dn_rt_finish_output(skb, dst_addr, src_addr); | |
469 | return NET_RX_SUCCESS; | |
470 | } | |
471 | ||
472 | /** | |
473 | * dn_route_rx_packet - Try and find a route for an incoming packet | |
474 | * @skb: The packet to find a route for | |
475 | * | |
476 | * Returns: result of input function if route is found, error code otherwise | |
477 | */ | |
478 | static int dn_route_rx_packet(struct sk_buff *skb) | |
479 | { | |
fc766e4c | 480 | struct dn_skb_cb *cb; |
1da177e4 LT |
481 | int err; |
482 | ||
483 | if ((err = dn_route_input(skb)) == 0) | |
484 | return dst_input(skb); | |
485 | ||
fc766e4c | 486 | cb = DN_SKB_CB(skb); |
1da177e4 LT |
487 | if (decnet_debug_level & 4) { |
488 | char *devname = skb->dev ? skb->dev->name : "???"; | |
fc766e4c | 489 | |
1da177e4 LT |
490 | printk(KERN_DEBUG |
491 | "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 | 492 | (int)cb->rt_flags, devname, skb->len, |
c4106aa8 | 493 | le16_to_cpu(cb->src), le16_to_cpu(cb->dst), |
1da177e4 LT |
494 | err, skb->pkt_type); |
495 | } | |
496 | ||
497 | if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) { | |
498 | switch(cb->rt_flags & DN_RT_PKT_MSK) { | |
499 | case DN_RT_PKT_SHORT: | |
500 | return dn_return_short(skb); | |
501 | case DN_RT_PKT_LONG: | |
502 | return dn_return_long(skb); | |
503 | } | |
504 | } | |
505 | ||
506 | kfree_skb(skb); | |
507 | return NET_RX_DROP; | |
508 | } | |
509 | ||
510 | static int dn_route_rx_long(struct sk_buff *skb) | |
511 | { | |
512 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
513 | unsigned char *ptr = skb->data; | |
514 | ||
515 | if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */ | |
516 | goto drop_it; | |
517 | ||
518 | skb_pull(skb, 20); | |
badff6d0 | 519 | skb_reset_transport_header(skb); |
1da177e4 | 520 | |
429eb0fa YH |
521 | /* Destination info */ |
522 | ptr += 2; | |
c4ea94ab | 523 | cb->dst = dn_eth2dn(ptr); |
429eb0fa YH |
524 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
525 | goto drop_it; | |
526 | ptr += 6; | |
1da177e4 LT |
527 | |
528 | ||
429eb0fa YH |
529 | /* Source info */ |
530 | ptr += 2; | |
c4ea94ab | 531 | cb->src = dn_eth2dn(ptr); |
429eb0fa YH |
532 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
533 | goto drop_it; | |
534 | ptr += 6; | |
535 | /* Other junk */ | |
536 | ptr++; | |
537 | cb->hops = *ptr++; /* Visit Count */ | |
1da177e4 | 538 | |
5d877d87 JE |
539 | return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, |
540 | dn_route_rx_packet); | |
1da177e4 LT |
541 | |
542 | drop_it: | |
543 | kfree_skb(skb); | |
544 | return NET_RX_DROP; | |
545 | } | |
546 | ||
547 | ||
548 | ||
549 | static int dn_route_rx_short(struct sk_buff *skb) | |
550 | { | |
551 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
552 | unsigned char *ptr = skb->data; | |
553 | ||
554 | if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */ | |
555 | goto drop_it; | |
556 | ||
557 | skb_pull(skb, 5); | |
badff6d0 | 558 | skb_reset_transport_header(skb); |
1da177e4 | 559 | |
c4ea94ab | 560 | cb->dst = *(__le16 *)ptr; |
429eb0fa YH |
561 | ptr += 2; |
562 | cb->src = *(__le16 *)ptr; | |
563 | ptr += 2; | |
564 | cb->hops = *ptr & 0x3f; | |
1da177e4 | 565 | |
5d877d87 JE |
566 | return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, |
567 | dn_route_rx_packet); | |
1da177e4 LT |
568 | |
569 | drop_it: | |
429eb0fa YH |
570 | kfree_skb(skb); |
571 | return NET_RX_DROP; | |
1da177e4 LT |
572 | } |
573 | ||
574 | static int dn_route_discard(struct sk_buff *skb) | |
575 | { | |
576 | /* | |
577 | * I know we drop the packet here, but thats considered success in | |
578 | * this case | |
579 | */ | |
580 | kfree_skb(skb); | |
581 | return NET_RX_SUCCESS; | |
582 | } | |
583 | ||
584 | static int dn_route_ptp_hello(struct sk_buff *skb) | |
585 | { | |
586 | dn_dev_hello(skb); | |
587 | dn_neigh_pointopoint_hello(skb); | |
588 | return NET_RX_SUCCESS; | |
589 | } | |
590 | ||
f2ccd8fa | 591 | int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
592 | { |
593 | struct dn_skb_cb *cb; | |
594 | unsigned char flags = 0; | |
c4106aa8 | 595 | __u16 len = le16_to_cpu(*(__le16 *)skb->data); |
fc766e4c | 596 | struct dn_dev *dn = rcu_dereference(dev->dn_ptr); |
1da177e4 LT |
597 | unsigned char padlen = 0; |
598 | ||
721499e8 | 599 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
600 | goto dump_it; |
601 | ||
1da177e4 LT |
602 | if (dn == NULL) |
603 | goto dump_it; | |
604 | ||
605 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
606 | goto out; | |
607 | ||
608 | if (!pskb_may_pull(skb, 3)) | |
609 | goto dump_it; | |
610 | ||
611 | skb_pull(skb, 2); | |
612 | ||
613 | if (len > skb->len) | |
614 | goto dump_it; | |
615 | ||
616 | skb_trim(skb, len); | |
617 | ||
618 | flags = *skb->data; | |
619 | ||
620 | cb = DN_SKB_CB(skb); | |
621 | cb->stamp = jiffies; | |
622 | cb->iif = dev->ifindex; | |
623 | ||
624 | /* | |
625 | * If we have padding, remove it. | |
626 | */ | |
627 | if (flags & DN_RT_F_PF) { | |
628 | padlen = flags & ~DN_RT_F_PF; | |
629 | if (!pskb_may_pull(skb, padlen + 1)) | |
630 | goto dump_it; | |
631 | skb_pull(skb, padlen); | |
632 | flags = *skb->data; | |
633 | } | |
634 | ||
c1d2bbe1 | 635 | skb_reset_network_header(skb); |
1da177e4 LT |
636 | |
637 | /* | |
638 | * Weed out future version DECnet | |
639 | */ | |
640 | if (flags & DN_RT_F_VER) | |
641 | goto dump_it; | |
642 | ||
643 | cb->rt_flags = flags; | |
644 | ||
645 | if (decnet_debug_level & 1) | |
429eb0fa | 646 | printk(KERN_DEBUG |
1da177e4 | 647 | "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n", |
429eb0fa | 648 | (int)flags, (dev) ? dev->name : "???", len, skb->len, |
1da177e4 LT |
649 | padlen); |
650 | ||
429eb0fa | 651 | if (flags & DN_RT_PKT_CNTL) { |
364c6bad | 652 | if (unlikely(skb_linearize(skb))) |
1da177e4 LT |
653 | goto dump_it; |
654 | ||
429eb0fa YH |
655 | switch(flags & DN_RT_CNTL_MSK) { |
656 | case DN_RT_PKT_INIT: | |
1da177e4 LT |
657 | dn_dev_init_pkt(skb); |
658 | break; | |
429eb0fa | 659 | case DN_RT_PKT_VERI: |
1da177e4 LT |
660 | dn_dev_veri_pkt(skb); |
661 | break; | |
662 | } | |
663 | ||
664 | if (dn->parms.state != DN_DEV_S_RU) | |
665 | goto dump_it; | |
666 | ||
667 | switch(flags & DN_RT_CNTL_MSK) { | |
429eb0fa | 668 | case DN_RT_PKT_HELO: |
5d877d87 JE |
669 | return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, |
670 | skb, skb->dev, NULL, | |
671 | dn_route_ptp_hello); | |
1da177e4 | 672 | |
429eb0fa YH |
673 | case DN_RT_PKT_L1RT: |
674 | case DN_RT_PKT_L2RT: | |
5d877d87 JE |
675 | return NF_HOOK(NFPROTO_DECNET, NF_DN_ROUTE, |
676 | skb, skb->dev, NULL, | |
677 | dn_route_discard); | |
429eb0fa | 678 | case DN_RT_PKT_ERTH: |
5d877d87 JE |
679 | return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, |
680 | skb, skb->dev, NULL, | |
681 | dn_neigh_router_hello); | |
1da177e4 | 682 | |
429eb0fa | 683 | case DN_RT_PKT_EEDH: |
5d877d87 JE |
684 | return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, |
685 | skb, skb->dev, NULL, | |
686 | dn_neigh_endnode_hello); | |
429eb0fa YH |
687 | } |
688 | } else { | |
1da177e4 LT |
689 | if (dn->parms.state != DN_DEV_S_RU) |
690 | goto dump_it; | |
691 | ||
692 | skb_pull(skb, 1); /* Pull flags */ | |
693 | ||
429eb0fa YH |
694 | switch(flags & DN_RT_PKT_MSK) { |
695 | case DN_RT_PKT_LONG: | |
696 | return dn_route_rx_long(skb); | |
697 | case DN_RT_PKT_SHORT: | |
698 | return dn_route_rx_short(skb); | |
1da177e4 | 699 | } |
429eb0fa | 700 | } |
1da177e4 LT |
701 | |
702 | dump_it: | |
703 | kfree_skb(skb); | |
704 | out: | |
705 | return NET_RX_DROP; | |
706 | } | |
707 | ||
708 | static int dn_output(struct sk_buff *skb) | |
709 | { | |
adf30907 | 710 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
711 | struct dn_route *rt = (struct dn_route *)dst; |
712 | struct net_device *dev = dst->dev; | |
713 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
714 | struct neighbour *neigh; | |
715 | ||
716 | int err = -EINVAL; | |
717 | ||
718 | if ((neigh = dst->neighbour) == NULL) | |
719 | goto error; | |
720 | ||
721 | skb->dev = dev; | |
722 | ||
723 | cb->src = rt->rt_saddr; | |
724 | cb->dst = rt->rt_daddr; | |
725 | ||
726 | /* | |
727 | * Always set the Intra-Ethernet bit on all outgoing packets | |
728 | * originated on this node. Only valid flag from upper layers | |
729 | * is return-to-sender-requested. Set hop count to 0 too. | |
730 | */ | |
731 | cb->rt_flags &= ~DN_RT_F_RQR; | |
732 | cb->rt_flags |= DN_RT_F_IE; | |
733 | cb->hops = 0; | |
734 | ||
5d877d87 JE |
735 | return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_OUT, skb, NULL, dev, |
736 | neigh->output); | |
1da177e4 LT |
737 | |
738 | error: | |
739 | if (net_ratelimit()) | |
740 | printk(KERN_DEBUG "dn_output: This should not happen\n"); | |
741 | ||
742 | kfree_skb(skb); | |
743 | ||
744 | return err; | |
745 | } | |
746 | ||
747 | static int dn_forward(struct sk_buff *skb) | |
748 | { | |
749 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
adf30907 | 750 | struct dst_entry *dst = skb_dst(skb); |
fc766e4c | 751 | struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr); |
1da177e4 LT |
752 | struct dn_route *rt; |
753 | struct neighbour *neigh = dst->neighbour; | |
754 | int header_len; | |
755 | #ifdef CONFIG_NETFILTER | |
756 | struct net_device *dev = skb->dev; | |
757 | #endif | |
758 | ||
759 | if (skb->pkt_type != PACKET_HOST) | |
760 | goto drop; | |
761 | ||
762 | /* Ensure that we have enough space for headers */ | |
adf30907 | 763 | rt = (struct dn_route *)skb_dst(skb); |
1da177e4 | 764 | header_len = dn_db->use_long ? 21 : 6; |
d8d1f30b | 765 | if (skb_cow(skb, LL_RESERVED_SPACE(rt->dst.dev)+header_len)) |
1da177e4 LT |
766 | goto drop; |
767 | ||
768 | /* | |
769 | * Hop count exceeded. | |
770 | */ | |
771 | if (++cb->hops > 30) | |
772 | goto drop; | |
773 | ||
d8d1f30b | 774 | skb->dev = rt->dst.dev; |
1da177e4 LT |
775 | |
776 | /* | |
777 | * If packet goes out same interface it came in on, then set | |
778 | * the Intra-Ethernet bit. This has no effect for short | |
779 | * packets, so we don't need to test for them here. | |
780 | */ | |
781 | cb->rt_flags &= ~DN_RT_F_IE; | |
782 | if (rt->rt_flags & RTCF_DOREDIRECT) | |
783 | cb->rt_flags |= DN_RT_F_IE; | |
784 | ||
5d877d87 JE |
785 | return NF_HOOK(NFPROTO_DECNET, NF_DN_FORWARD, skb, dev, skb->dev, |
786 | neigh->output); | |
1da177e4 LT |
787 | |
788 | drop: | |
789 | kfree_skb(skb); | |
790 | return NET_RX_DROP; | |
791 | } | |
792 | ||
1da177e4 LT |
793 | /* |
794 | * Used to catch bugs. This should never normally get | |
795 | * called. | |
796 | */ | |
797 | static int dn_rt_bug(struct sk_buff *skb) | |
798 | { | |
799 | if (net_ratelimit()) { | |
800 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
801 | ||
802 | printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n", | |
c4106aa8 | 803 | le16_to_cpu(cb->src), le16_to_cpu(cb->dst)); |
1da177e4 LT |
804 | } |
805 | ||
806 | kfree_skb(skb); | |
807 | ||
0e8635a8 | 808 | return NET_RX_DROP; |
1da177e4 LT |
809 | } |
810 | ||
0dbaee3b DM |
811 | static unsigned int dn_dst_default_advmss(const struct dst_entry *dst) |
812 | { | |
813 | return dn_mss_from_pmtu(dst->dev, dst_mtu(dst)); | |
814 | } | |
815 | ||
d33e4553 DM |
816 | static unsigned int dn_dst_default_mtu(const struct dst_entry *dst) |
817 | { | |
818 | return dst->dev->mtu; | |
819 | } | |
820 | ||
1da177e4 LT |
821 | static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res) |
822 | { | |
823 | struct dn_fib_info *fi = res->fi; | |
d8d1f30b | 824 | struct net_device *dev = rt->dst.dev; |
62fa8a84 | 825 | unsigned int mss_metric; |
1da177e4 | 826 | struct neighbour *n; |
1da177e4 LT |
827 | |
828 | if (fi) { | |
829 | if (DN_FIB_RES_GW(*res) && | |
830 | DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
831 | rt->rt_gateway = DN_FIB_RES_GW(*res); | |
62fa8a84 | 832 | dst_init_metrics(&rt->dst, fi->fib_metrics, true); |
1da177e4 LT |
833 | } |
834 | rt->rt_type = res->type; | |
835 | ||
d8d1f30b | 836 | if (dev != NULL && rt->dst.neighbour == NULL) { |
1da177e4 LT |
837 | n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev); |
838 | if (IS_ERR(n)) | |
839 | return PTR_ERR(n); | |
d8d1f30b | 840 | rt->dst.neighbour = n; |
1da177e4 LT |
841 | } |
842 | ||
d33e4553 | 843 | if (dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu) |
defb3519 | 844 | dst_metric_set(&rt->dst, RTAX_MTU, rt->dst.dev->mtu); |
62fa8a84 DM |
845 | mss_metric = dst_metric_raw(&rt->dst, RTAX_ADVMSS); |
846 | if (mss_metric) { | |
0dbaee3b | 847 | unsigned int mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->dst)); |
62fa8a84 | 848 | if (mss_metric > mss) |
0dbaee3b DM |
849 | dst_metric_set(&rt->dst, RTAX_ADVMSS, mss); |
850 | } | |
1da177e4 LT |
851 | return 0; |
852 | } | |
853 | ||
c4ea94ab | 854 | static inline int dn_match_addr(__le16 addr1, __le16 addr2) |
1da177e4 | 855 | { |
c4106aa8 | 856 | __u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(addr2); |
1da177e4 LT |
857 | int match = 16; |
858 | while(tmp) { | |
859 | tmp >>= 1; | |
860 | match--; | |
861 | } | |
862 | return match; | |
863 | } | |
864 | ||
c4ea94ab | 865 | static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope) |
1da177e4 | 866 | { |
c4ea94ab | 867 | __le16 saddr = 0; |
fc766e4c | 868 | struct dn_dev *dn_db; |
1da177e4 LT |
869 | struct dn_ifaddr *ifa; |
870 | int best_match = 0; | |
871 | int ret; | |
872 | ||
fc766e4c ED |
873 | rcu_read_lock(); |
874 | dn_db = rcu_dereference(dev->dn_ptr); | |
875 | for (ifa = rcu_dereference(dn_db->ifa_list); | |
876 | ifa != NULL; | |
877 | ifa = rcu_dereference(ifa->ifa_next)) { | |
1da177e4 LT |
878 | if (ifa->ifa_scope > scope) |
879 | continue; | |
880 | if (!daddr) { | |
881 | saddr = ifa->ifa_local; | |
882 | break; | |
883 | } | |
884 | ret = dn_match_addr(daddr, ifa->ifa_local); | |
885 | if (ret > best_match) | |
886 | saddr = ifa->ifa_local; | |
887 | if (best_match == 0) | |
888 | saddr = ifa->ifa_local; | |
889 | } | |
fc766e4c | 890 | rcu_read_unlock(); |
1da177e4 LT |
891 | |
892 | return saddr; | |
893 | } | |
894 | ||
c4ea94ab | 895 | static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res) |
1da177e4 LT |
896 | { |
897 | return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope); | |
898 | } | |
899 | ||
c4ea94ab | 900 | static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res) |
1da177e4 | 901 | { |
c4ea94ab | 902 | __le16 mask = dnet_make_mask(res->prefixlen); |
1da177e4 LT |
903 | return (daddr&~mask)|res->fi->fib_nh->nh_gw; |
904 | } | |
905 | ||
bef55aeb | 906 | static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *oldflp, int try_hard) |
1da177e4 | 907 | { |
bef55aeb DM |
908 | struct flowidn fld = { |
909 | .daddr = oldflp->daddr, | |
910 | .saddr = oldflp->saddr, | |
911 | .flowidn_scope = RT_SCOPE_UNIVERSE, | |
912 | .flowidn_mark = oldflp->flowidn_mark, | |
913 | .flowidn_iif = init_net.loopback_dev->ifindex, | |
914 | .flowidn_oif = oldflp->flowidn_oif, | |
1d28f42c | 915 | }; |
1da177e4 | 916 | struct dn_route *rt = NULL; |
7562f876 | 917 | struct net_device *dev_out = NULL, *dev; |
1da177e4 LT |
918 | struct neighbour *neigh = NULL; |
919 | unsigned hash; | |
920 | unsigned flags = 0; | |
921 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST }; | |
922 | int err; | |
923 | int free_res = 0; | |
c4ea94ab | 924 | __le16 gateway = 0; |
1da177e4 LT |
925 | |
926 | if (decnet_debug_level & 16) | |
927 | printk(KERN_DEBUG | |
928 | "dn_route_output_slow: dst=%04x src=%04x mark=%d" | |
bef55aeb DM |
929 | " iif=%d oif=%d\n", le16_to_cpu(oldflp->daddr), |
930 | le16_to_cpu(oldflp->saddr), | |
931 | oldflp->flowidn_mark, init_net.loopback_dev->ifindex, | |
932 | oldflp->flowidn_oif); | |
1da177e4 LT |
933 | |
934 | /* If we have an output interface, verify its a DECnet device */ | |
bef55aeb DM |
935 | if (oldflp->flowidn_oif) { |
936 | dev_out = dev_get_by_index(&init_net, oldflp->flowidn_oif); | |
1da177e4 LT |
937 | err = -ENODEV; |
938 | if (dev_out && dev_out->dn_ptr == NULL) { | |
939 | dev_put(dev_out); | |
940 | dev_out = NULL; | |
941 | } | |
942 | if (dev_out == NULL) | |
943 | goto out; | |
944 | } | |
945 | ||
946 | /* If we have a source address, verify that its a local address */ | |
bef55aeb | 947 | if (oldflp->saddr) { |
1da177e4 LT |
948 | err = -EADDRNOTAVAIL; |
949 | ||
950 | if (dev_out) { | |
bef55aeb | 951 | if (dn_dev_islocal(dev_out, oldflp->saddr)) |
1da177e4 LT |
952 | goto source_ok; |
953 | dev_put(dev_out); | |
954 | goto out; | |
955 | } | |
c6d14c84 ED |
956 | rcu_read_lock(); |
957 | for_each_netdev_rcu(&init_net, dev) { | |
7562f876 | 958 | if (!dev->dn_ptr) |
1da177e4 | 959 | continue; |
bef55aeb | 960 | if (!dn_dev_islocal(dev, oldflp->saddr)) |
9bbf28a1 | 961 | continue; |
7562f876 | 962 | if ((dev->flags & IFF_LOOPBACK) && |
bef55aeb DM |
963 | oldflp->daddr && |
964 | !dn_dev_islocal(dev, oldflp->daddr)) | |
9bbf28a1 | 965 | continue; |
7562f876 PE |
966 | |
967 | dev_out = dev; | |
9bbf28a1 | 968 | break; |
1da177e4 | 969 | } |
c6d14c84 | 970 | rcu_read_unlock(); |
1da177e4 LT |
971 | if (dev_out == NULL) |
972 | goto out; | |
973 | dev_hold(dev_out); | |
974 | source_ok: | |
975 | ; | |
976 | } | |
977 | ||
978 | /* No destination? Assume its local */ | |
bef55aeb DM |
979 | if (!fld.daddr) { |
980 | fld.daddr = fld.saddr; | |
1da177e4 LT |
981 | |
982 | err = -EADDRNOTAVAIL; | |
983 | if (dev_out) | |
984 | dev_put(dev_out); | |
2774c7ab | 985 | dev_out = init_net.loopback_dev; |
1da177e4 | 986 | dev_hold(dev_out); |
bef55aeb DM |
987 | if (!fld.daddr) { |
988 | fld.daddr = | |
989 | fld.saddr = dnet_select_source(dev_out, 0, | |
1da177e4 | 990 | RT_SCOPE_HOST); |
bef55aeb | 991 | if (!fld.daddr) |
1da177e4 LT |
992 | goto out; |
993 | } | |
bef55aeb | 994 | fld.flowidn_oif = init_net.loopback_dev->ifindex; |
1da177e4 LT |
995 | res.type = RTN_LOCAL; |
996 | goto make_route; | |
997 | } | |
998 | ||
999 | if (decnet_debug_level & 16) | |
1000 | printk(KERN_DEBUG | |
1001 | "dn_route_output_slow: initial checks complete." | |
c4ea94ab | 1002 | " dst=%o4x src=%04x oif=%d try_hard=%d\n", |
bef55aeb DM |
1003 | le16_to_cpu(fld.daddr), le16_to_cpu(fld.saddr), |
1004 | fld.flowidn_oif, try_hard); | |
1da177e4 LT |
1005 | |
1006 | /* | |
1007 | * N.B. If the kernel is compiled without router support then | |
1008 | * dn_fib_lookup() will evaluate to non-zero so this if () block | |
1009 | * will always be executed. | |
1010 | */ | |
1011 | err = -ESRCH; | |
bef55aeb | 1012 | if (try_hard || (err = dn_fib_lookup(&fld, &res)) != 0) { |
1da177e4 LT |
1013 | struct dn_dev *dn_db; |
1014 | if (err != -ESRCH) | |
1015 | goto out; | |
1016 | /* | |
429eb0fa | 1017 | * Here the fallback is basically the standard algorithm for |
1da177e4 LT |
1018 | * routing in endnodes which is described in the DECnet routing |
1019 | * docs | |
1020 | * | |
1021 | * If we are not trying hard, look in neighbour cache. | |
1022 | * The result is tested to ensure that if a specific output | |
429eb0fa | 1023 | * device/source address was requested, then we honour that |
1da177e4 LT |
1024 | * here |
1025 | */ | |
1026 | if (!try_hard) { | |
bef55aeb | 1027 | neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fld.daddr); |
1da177e4 | 1028 | if (neigh) { |
bef55aeb DM |
1029 | if ((oldflp->flowidn_oif && |
1030 | (neigh->dev->ifindex != oldflp->flowidn_oif)) || | |
1031 | (oldflp->saddr && | |
1da177e4 | 1032 | (!dn_dev_islocal(neigh->dev, |
bef55aeb | 1033 | oldflp->saddr)))) { |
1da177e4 LT |
1034 | neigh_release(neigh); |
1035 | neigh = NULL; | |
1036 | } else { | |
1037 | if (dev_out) | |
1038 | dev_put(dev_out); | |
bef55aeb | 1039 | if (dn_dev_islocal(neigh->dev, fld.daddr)) { |
2774c7ab | 1040 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1041 | res.type = RTN_LOCAL; |
1042 | } else { | |
1043 | dev_out = neigh->dev; | |
1044 | } | |
1045 | dev_hold(dev_out); | |
1046 | goto select_source; | |
1047 | } | |
1048 | } | |
1049 | } | |
1050 | ||
1051 | /* Not there? Perhaps its a local address */ | |
1052 | if (dev_out == NULL) | |
1053 | dev_out = dn_dev_get_default(); | |
1054 | err = -ENODEV; | |
1055 | if (dev_out == NULL) | |
1056 | goto out; | |
fc766e4c | 1057 | dn_db = rcu_dereference_raw(dev_out->dn_ptr); |
1da177e4 | 1058 | /* Possible improvement - check all devices for local addr */ |
bef55aeb | 1059 | if (dn_dev_islocal(dev_out, fld.daddr)) { |
1da177e4 | 1060 | dev_put(dev_out); |
2774c7ab | 1061 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1062 | dev_hold(dev_out); |
1063 | res.type = RTN_LOCAL; | |
1064 | goto select_source; | |
1065 | } | |
1066 | /* Not local either.... try sending it to the default router */ | |
1067 | neigh = neigh_clone(dn_db->router); | |
1068 | BUG_ON(neigh && neigh->dev != dev_out); | |
1069 | ||
1070 | /* Ok then, we assume its directly connected and move on */ | |
1071 | select_source: | |
1072 | if (neigh) | |
1073 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1074 | if (gateway == 0) | |
bef55aeb DM |
1075 | gateway = fld.daddr; |
1076 | if (fld.saddr == 0) { | |
1077 | fld.saddr = dnet_select_source(dev_out, gateway, | |
1078 | res.type == RTN_LOCAL ? | |
1079 | RT_SCOPE_HOST : | |
1080 | RT_SCOPE_LINK); | |
1081 | if (fld.saddr == 0 && res.type != RTN_LOCAL) | |
1da177e4 LT |
1082 | goto e_addr; |
1083 | } | |
bef55aeb | 1084 | fld.flowidn_oif = dev_out->ifindex; |
1da177e4 LT |
1085 | goto make_route; |
1086 | } | |
1087 | free_res = 1; | |
1088 | ||
1089 | if (res.type == RTN_NAT) | |
1090 | goto e_inval; | |
1091 | ||
1092 | if (res.type == RTN_LOCAL) { | |
bef55aeb DM |
1093 | if (!fld.saddr) |
1094 | fld.saddr = fld.daddr; | |
1da177e4 LT |
1095 | if (dev_out) |
1096 | dev_put(dev_out); | |
2774c7ab | 1097 | dev_out = init_net.loopback_dev; |
1da177e4 | 1098 | dev_hold(dev_out); |
bef55aeb | 1099 | fld.flowidn_oif = dev_out->ifindex; |
1da177e4 LT |
1100 | if (res.fi) |
1101 | dn_fib_info_put(res.fi); | |
1102 | res.fi = NULL; | |
1103 | goto make_route; | |
1104 | } | |
1105 | ||
bef55aeb DM |
1106 | if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0) |
1107 | dn_fib_select_multipath(&fld, &res); | |
1da177e4 | 1108 | |
429eb0fa | 1109 | /* |
1da177e4 LT |
1110 | * We could add some logic to deal with default routes here and |
1111 | * get rid of some of the special casing above. | |
1112 | */ | |
1113 | ||
bef55aeb DM |
1114 | if (!fld.saddr) |
1115 | fld.saddr = DN_FIB_RES_PREFSRC(res); | |
429eb0fa | 1116 | |
1da177e4 LT |
1117 | if (dev_out) |
1118 | dev_put(dev_out); | |
1119 | dev_out = DN_FIB_RES_DEV(res); | |
1120 | dev_hold(dev_out); | |
bef55aeb | 1121 | fld.flowidn_oif = dev_out->ifindex; |
1da177e4 LT |
1122 | gateway = DN_FIB_RES_GW(res); |
1123 | ||
1124 | make_route: | |
1125 | if (dev_out->flags & IFF_LOOPBACK) | |
1126 | flags |= RTCF_LOCAL; | |
1127 | ||
3c7bd1a1 | 1128 | rt = dst_alloc(&dn_dst_ops, 0); |
1da177e4 LT |
1129 | if (rt == NULL) |
1130 | goto e_nobufs; | |
1131 | ||
d8d1f30b CG |
1132 | atomic_set(&rt->dst.__refcnt, 1); |
1133 | rt->dst.flags = DST_HOST; | |
1da177e4 | 1134 | |
bef55aeb DM |
1135 | rt->fld.saddr = oldflp->saddr; |
1136 | rt->fld.daddr = oldflp->daddr; | |
1137 | rt->fld.flowidn_oif = oldflp->flowidn_oif; | |
1138 | rt->fld.flowidn_iif = 0; | |
1139 | rt->fld.flowidn_mark = oldflp->flowidn_mark; | |
1da177e4 | 1140 | |
bef55aeb DM |
1141 | rt->rt_saddr = fld.saddr; |
1142 | rt->rt_daddr = fld.daddr; | |
1143 | rt->rt_gateway = gateway ? gateway : fld.daddr; | |
1144 | rt->rt_local_src = fld.saddr; | |
1da177e4 | 1145 | |
bef55aeb DM |
1146 | rt->rt_dst_map = fld.daddr; |
1147 | rt->rt_src_map = fld.saddr; | |
1da177e4 | 1148 | |
d8d1f30b | 1149 | rt->dst.dev = dev_out; |
1da177e4 | 1150 | dev_hold(dev_out); |
d8d1f30b | 1151 | rt->dst.neighbour = neigh; |
1da177e4 LT |
1152 | neigh = NULL; |
1153 | ||
d8d1f30b CG |
1154 | rt->dst.lastuse = jiffies; |
1155 | rt->dst.output = dn_output; | |
1156 | rt->dst.input = dn_rt_bug; | |
1da177e4 LT |
1157 | rt->rt_flags = flags; |
1158 | if (flags & RTCF_LOCAL) | |
d8d1f30b | 1159 | rt->dst.input = dn_nsp_rx; |
1da177e4 LT |
1160 | |
1161 | err = dn_rt_set_next_hop(rt, &res); | |
1162 | if (err) | |
1163 | goto e_neighbour; | |
1164 | ||
bef55aeb | 1165 | hash = dn_hash(rt->fld.saddr, rt->fld.daddr); |
1da177e4 LT |
1166 | dn_insert_route(rt, hash, (struct dn_route **)pprt); |
1167 | ||
1168 | done: | |
1169 | if (neigh) | |
1170 | neigh_release(neigh); | |
1171 | if (free_res) | |
1172 | dn_fib_res_put(&res); | |
1173 | if (dev_out) | |
1174 | dev_put(dev_out); | |
1175 | out: | |
1176 | return err; | |
1177 | ||
1178 | e_addr: | |
429eb0fa YH |
1179 | err = -EADDRNOTAVAIL; |
1180 | goto done; | |
1da177e4 LT |
1181 | e_inval: |
1182 | err = -EINVAL; | |
1183 | goto done; | |
1184 | e_nobufs: | |
1185 | err = -ENOBUFS; | |
1186 | goto done; | |
1187 | e_neighbour: | |
d8d1f30b | 1188 | dst_free(&rt->dst); |
1da177e4 LT |
1189 | goto e_nobufs; |
1190 | } | |
1191 | ||
1192 | ||
1193 | /* | |
1194 | * N.B. The flags may be moved into the flowi at some future stage. | |
1195 | */ | |
bef55aeb | 1196 | static int __dn_route_output_key(struct dst_entry **pprt, const struct flowidn *flp, int flags) |
1da177e4 | 1197 | { |
bef55aeb | 1198 | unsigned hash = dn_hash(flp->saddr, flp->daddr); |
1da177e4 LT |
1199 | struct dn_route *rt = NULL; |
1200 | ||
1201 | if (!(flags & MSG_TRYHARD)) { | |
1202 | rcu_read_lock_bh(); | |
a898def2 | 1203 | for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt; |
d8d1f30b | 1204 | rt = rcu_dereference_bh(rt->dst.dn_next)) { |
bef55aeb DM |
1205 | if ((flp->daddr == rt->fld.daddr) && |
1206 | (flp->saddr == rt->fld.saddr) && | |
1207 | (flp->flowidn_mark == rt->fld.flowidn_mark) && | |
c7537967 | 1208 | dn_is_output_route(rt) && |
bef55aeb | 1209 | (rt->fld.flowidn_oif == flp->flowidn_oif)) { |
d8d1f30b | 1210 | dst_use(&rt->dst, jiffies); |
1da177e4 | 1211 | rcu_read_unlock_bh(); |
d8d1f30b | 1212 | *pprt = &rt->dst; |
1da177e4 LT |
1213 | return 0; |
1214 | } | |
1215 | } | |
1216 | rcu_read_unlock_bh(); | |
1217 | } | |
1218 | ||
1219 | return dn_route_output_slow(pprt, flp, flags); | |
1220 | } | |
1221 | ||
bef55aeb | 1222 | static int dn_route_output_key(struct dst_entry **pprt, struct flowidn *flp, int flags) |
1da177e4 LT |
1223 | { |
1224 | int err; | |
1225 | ||
1226 | err = __dn_route_output_key(pprt, flp, flags); | |
bef55aeb DM |
1227 | if (err == 0 && flp->flowidn_proto) { |
1228 | *pprt = xfrm_lookup(&init_net, *pprt, | |
1229 | flowidn_to_flowi(flp), NULL, 0); | |
452edd59 DM |
1230 | if (IS_ERR(*pprt)) { |
1231 | err = PTR_ERR(*pprt); | |
1232 | *pprt = NULL; | |
1233 | } | |
1da177e4 LT |
1234 | } |
1235 | return err; | |
1236 | } | |
1237 | ||
bef55aeb | 1238 | int dn_route_output_sock(struct dst_entry **pprt, struct flowidn *fl, struct sock *sk, int flags) |
1da177e4 LT |
1239 | { |
1240 | int err; | |
1241 | ||
1242 | err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD); | |
bef55aeb | 1243 | if (err == 0 && fl->flowidn_proto) { |
80c0bc9e | 1244 | if (!(flags & MSG_DONTWAIT)) |
bef55aeb DM |
1245 | fl->flowidn_flags |= FLOWI_FLAG_CAN_SLEEP; |
1246 | *pprt = xfrm_lookup(&init_net, *pprt, | |
1247 | flowidn_to_flowi(fl), sk, 0); | |
452edd59 DM |
1248 | if (IS_ERR(*pprt)) { |
1249 | err = PTR_ERR(*pprt); | |
1250 | *pprt = NULL; | |
1251 | } | |
1da177e4 LT |
1252 | } |
1253 | return err; | |
1254 | } | |
1255 | ||
1256 | static int dn_route_input_slow(struct sk_buff *skb) | |
1257 | { | |
1258 | struct dn_route *rt = NULL; | |
1259 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1260 | struct net_device *in_dev = skb->dev; | |
1261 | struct net_device *out_dev = NULL; | |
1262 | struct dn_dev *dn_db; | |
1263 | struct neighbour *neigh = NULL; | |
1264 | unsigned hash; | |
1265 | int flags = 0; | |
c4ea94ab SW |
1266 | __le16 gateway = 0; |
1267 | __le16 local_src = 0; | |
bef55aeb DM |
1268 | struct flowidn fld = { |
1269 | .daddr = cb->dst, | |
1270 | .saddr = cb->src, | |
1271 | .flowidn_scope = RT_SCOPE_UNIVERSE, | |
1272 | .flowidn_mark = skb->mark, | |
1273 | .flowidn_iif = skb->dev->ifindex, | |
1d28f42c | 1274 | }; |
1da177e4 LT |
1275 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE }; |
1276 | int err = -EINVAL; | |
1277 | int free_res = 0; | |
1278 | ||
1279 | dev_hold(in_dev); | |
1280 | ||
fc766e4c | 1281 | if ((dn_db = rcu_dereference(in_dev->dn_ptr)) == NULL) |
1da177e4 LT |
1282 | goto out; |
1283 | ||
1284 | /* Zero source addresses are not allowed */ | |
bef55aeb | 1285 | if (fld.saddr == 0) |
1da177e4 LT |
1286 | goto out; |
1287 | ||
1288 | /* | |
1289 | * In this case we've just received a packet from a source | |
1290 | * outside ourselves pretending to come from us. We don't | |
1291 | * allow it any further to prevent routing loops, spoofing and | |
1292 | * other nasties. Loopback packets already have the dst attached | |
1293 | * so this only affects packets which have originated elsewhere. | |
1294 | */ | |
1295 | err = -ENOTUNIQ; | |
1296 | if (dn_dev_islocal(in_dev, cb->src)) | |
1297 | goto out; | |
1298 | ||
bef55aeb | 1299 | err = dn_fib_lookup(&fld, &res); |
1da177e4 LT |
1300 | if (err) { |
1301 | if (err != -ESRCH) | |
1302 | goto out; | |
1303 | /* | |
1304 | * Is the destination us ? | |
1305 | */ | |
1306 | if (!dn_dev_islocal(in_dev, cb->dst)) | |
1307 | goto e_inval; | |
1308 | ||
1309 | res.type = RTN_LOCAL; | |
1da177e4 | 1310 | } else { |
bef55aeb | 1311 | __le16 src_map = fld.saddr; |
1da177e4 LT |
1312 | free_res = 1; |
1313 | ||
1314 | out_dev = DN_FIB_RES_DEV(res); | |
1315 | if (out_dev == NULL) { | |
1316 | if (net_ratelimit()) | |
1317 | printk(KERN_CRIT "Bug in dn_route_input_slow() " | |
1318 | "No output device\n"); | |
1319 | goto e_inval; | |
1320 | } | |
1321 | dev_hold(out_dev); | |
1322 | ||
1323 | if (res.r) | |
bef55aeb | 1324 | src_map = fld.saddr; /* no NAT support for now */ |
1da177e4 LT |
1325 | |
1326 | gateway = DN_FIB_RES_GW(res); | |
1327 | if (res.type == RTN_NAT) { | |
bef55aeb | 1328 | fld.daddr = dn_fib_rules_map_destination(fld.daddr, &res); |
1da177e4 LT |
1329 | dn_fib_res_put(&res); |
1330 | free_res = 0; | |
bef55aeb | 1331 | if (dn_fib_lookup(&fld, &res)) |
1da177e4 LT |
1332 | goto e_inval; |
1333 | free_res = 1; | |
1334 | if (res.type != RTN_UNICAST) | |
1335 | goto e_inval; | |
1336 | flags |= RTCF_DNAT; | |
bef55aeb | 1337 | gateway = fld.daddr; |
1da177e4 | 1338 | } |
bef55aeb | 1339 | fld.saddr = src_map; |
1da177e4 LT |
1340 | } |
1341 | ||
1342 | switch(res.type) { | |
1343 | case RTN_UNICAST: | |
1344 | /* | |
1345 | * Forwarding check here, we only check for forwarding | |
1346 | * being turned off, if you want to only forward intra | |
1347 | * area, its up to you to set the routing tables up | |
1348 | * correctly. | |
1349 | */ | |
1350 | if (dn_db->parms.forwarding == 0) | |
1351 | goto e_inval; | |
1352 | ||
bef55aeb DM |
1353 | if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0) |
1354 | dn_fib_select_multipath(&fld, &res); | |
1da177e4 | 1355 | |
429eb0fa | 1356 | /* |
1da177e4 LT |
1357 | * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT |
1358 | * flag as a hint to set the intra-ethernet bit when | |
1359 | * forwarding. If we've got NAT in operation, we don't do | |
1360 | * this optimisation. | |
1361 | */ | |
1362 | if (out_dev == in_dev && !(flags & RTCF_NAT)) | |
1363 | flags |= RTCF_DOREDIRECT; | |
1364 | ||
1365 | local_src = DN_FIB_RES_PREFSRC(res); | |
1366 | ||
1367 | case RTN_BLACKHOLE: | |
1368 | case RTN_UNREACHABLE: | |
1369 | break; | |
1370 | case RTN_LOCAL: | |
1371 | flags |= RTCF_LOCAL; | |
bef55aeb DM |
1372 | fld.saddr = cb->dst; |
1373 | fld.daddr = cb->src; | |
1da177e4 LT |
1374 | |
1375 | /* Routing tables gave us a gateway */ | |
1376 | if (gateway) | |
1377 | goto make_route; | |
1378 | ||
1379 | /* Packet was intra-ethernet, so we know its on-link */ | |
3a31b9d2 | 1380 | if (cb->rt_flags & DN_RT_F_IE) { |
1da177e4 LT |
1381 | gateway = cb->src; |
1382 | flags |= RTCF_DIRECTSRC; | |
1383 | goto make_route; | |
1384 | } | |
1385 | ||
1386 | /* Use the default router if there is one */ | |
1387 | neigh = neigh_clone(dn_db->router); | |
1388 | if (neigh) { | |
1389 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1390 | goto make_route; | |
1391 | } | |
1392 | ||
1393 | /* Close eyes and pray */ | |
1394 | gateway = cb->src; | |
1395 | flags |= RTCF_DIRECTSRC; | |
1396 | goto make_route; | |
1397 | default: | |
1398 | goto e_inval; | |
1399 | } | |
1400 | ||
1401 | make_route: | |
3c7bd1a1 | 1402 | rt = dst_alloc(&dn_dst_ops, 0); |
1da177e4 LT |
1403 | if (rt == NULL) |
1404 | goto e_nobufs; | |
1405 | ||
bef55aeb DM |
1406 | rt->rt_saddr = fld.saddr; |
1407 | rt->rt_daddr = fld.daddr; | |
1408 | rt->rt_gateway = fld.daddr; | |
1da177e4 LT |
1409 | if (gateway) |
1410 | rt->rt_gateway = gateway; | |
1411 | rt->rt_local_src = local_src ? local_src : rt->rt_saddr; | |
1412 | ||
bef55aeb DM |
1413 | rt->rt_dst_map = fld.daddr; |
1414 | rt->rt_src_map = fld.saddr; | |
1da177e4 | 1415 | |
bef55aeb DM |
1416 | rt->fld.saddr = cb->src; |
1417 | rt->fld.daddr = cb->dst; | |
1418 | rt->fld.flowidn_oif = 0; | |
1419 | rt->fld.flowidn_iif = in_dev->ifindex; | |
1420 | rt->fld.flowidn_mark = fld.flowidn_mark; | |
1da177e4 | 1421 | |
d8d1f30b CG |
1422 | rt->dst.flags = DST_HOST; |
1423 | rt->dst.neighbour = neigh; | |
1424 | rt->dst.dev = out_dev; | |
1425 | rt->dst.lastuse = jiffies; | |
1426 | rt->dst.output = dn_rt_bug; | |
1da177e4 LT |
1427 | switch(res.type) { |
1428 | case RTN_UNICAST: | |
d8d1f30b | 1429 | rt->dst.input = dn_forward; |
1da177e4 LT |
1430 | break; |
1431 | case RTN_LOCAL: | |
d8d1f30b CG |
1432 | rt->dst.output = dn_output; |
1433 | rt->dst.input = dn_nsp_rx; | |
1434 | rt->dst.dev = in_dev; | |
1da177e4 LT |
1435 | flags |= RTCF_LOCAL; |
1436 | break; | |
1437 | default: | |
1438 | case RTN_UNREACHABLE: | |
1439 | case RTN_BLACKHOLE: | |
d8d1f30b | 1440 | rt->dst.input = dst_discard; |
1da177e4 LT |
1441 | } |
1442 | rt->rt_flags = flags; | |
d8d1f30b CG |
1443 | if (rt->dst.dev) |
1444 | dev_hold(rt->dst.dev); | |
1da177e4 LT |
1445 | |
1446 | err = dn_rt_set_next_hop(rt, &res); | |
1447 | if (err) | |
1448 | goto e_neighbour; | |
1449 | ||
bef55aeb | 1450 | hash = dn_hash(rt->fld.saddr, rt->fld.daddr); |
adf30907 | 1451 | dn_insert_route(rt, hash, &rt); |
d8d1f30b | 1452 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
1453 | |
1454 | done: | |
1455 | if (neigh) | |
1456 | neigh_release(neigh); | |
1457 | if (free_res) | |
1458 | dn_fib_res_put(&res); | |
1459 | dev_put(in_dev); | |
1460 | if (out_dev) | |
1461 | dev_put(out_dev); | |
1462 | out: | |
1463 | return err; | |
1464 | ||
1465 | e_inval: | |
1466 | err = -EINVAL; | |
1467 | goto done; | |
1468 | ||
1469 | e_nobufs: | |
1470 | err = -ENOBUFS; | |
1471 | goto done; | |
1472 | ||
1473 | e_neighbour: | |
d8d1f30b | 1474 | dst_free(&rt->dst); |
1da177e4 LT |
1475 | goto done; |
1476 | } | |
1477 | ||
5eaa65b2 | 1478 | static int dn_route_input(struct sk_buff *skb) |
1da177e4 LT |
1479 | { |
1480 | struct dn_route *rt; | |
1481 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1482 | unsigned hash = dn_hash(cb->src, cb->dst); | |
1483 | ||
adf30907 | 1484 | if (skb_dst(skb)) |
1da177e4 LT |
1485 | return 0; |
1486 | ||
1487 | rcu_read_lock(); | |
1488 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL; | |
d8d1f30b | 1489 | rt = rcu_dereference(rt->dst.dn_next)) { |
bef55aeb DM |
1490 | if ((rt->fld.saddr == cb->src) && |
1491 | (rt->fld.daddr == cb->dst) && | |
1492 | (rt->fld.flowidn_oif == 0) && | |
1493 | (rt->fld.flowidn_mark == skb->mark) && | |
1494 | (rt->fld.flowidn_iif == cb->iif)) { | |
d8d1f30b | 1495 | dst_use(&rt->dst, jiffies); |
1da177e4 | 1496 | rcu_read_unlock(); |
adf30907 | 1497 | skb_dst_set(skb, (struct dst_entry *)rt); |
1da177e4 LT |
1498 | return 0; |
1499 | } | |
1500 | } | |
1501 | rcu_read_unlock(); | |
1502 | ||
1503 | return dn_route_input_slow(skb); | |
1504 | } | |
1505 | ||
b6544c0b JHS |
1506 | static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
1507 | int event, int nowait, unsigned int flags) | |
1da177e4 | 1508 | { |
adf30907 | 1509 | struct dn_route *rt = (struct dn_route *)skb_dst(skb); |
1da177e4 LT |
1510 | struct rtmsg *r; |
1511 | struct nlmsghdr *nlh; | |
27a884dc | 1512 | unsigned char *b = skb_tail_pointer(skb); |
e3703b3d | 1513 | long expires; |
1da177e4 | 1514 | |
b6544c0b | 1515 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); |
1da177e4 | 1516 | r = NLMSG_DATA(nlh); |
1da177e4 LT |
1517 | r->rtm_family = AF_DECnet; |
1518 | r->rtm_dst_len = 16; | |
1519 | r->rtm_src_len = 0; | |
1520 | r->rtm_tos = 0; | |
1521 | r->rtm_table = RT_TABLE_MAIN; | |
9e762a4a | 1522 | RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1da177e4 LT |
1523 | r->rtm_type = rt->rt_type; |
1524 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
1525 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
1526 | r->rtm_protocol = RTPROT_UNSPEC; | |
1527 | if (rt->rt_flags & RTCF_NOTIFY) | |
1528 | r->rtm_flags |= RTM_F_NOTIFY; | |
1529 | RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr); | |
bef55aeb | 1530 | if (rt->fld.saddr) { |
1da177e4 | 1531 | r->rtm_src_len = 16; |
bef55aeb | 1532 | RTA_PUT(skb, RTA_SRC, 2, &rt->fld.saddr); |
1da177e4 | 1533 | } |
d8d1f30b CG |
1534 | if (rt->dst.dev) |
1535 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->dst.dev->ifindex); | |
1da177e4 LT |
1536 | /* |
1537 | * Note to self - change this if input routes reverse direction when | |
1538 | * they deal only with inputs and not with replies like they do | |
1539 | * currently. | |
1540 | */ | |
1541 | RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src); | |
1542 | if (rt->rt_daddr != rt->rt_gateway) | |
1543 | RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway); | |
defb3519 | 1544 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
1da177e4 | 1545 | goto rtattr_failure; |
d8d1f30b CG |
1546 | expires = rt->dst.expires ? rt->dst.expires - jiffies : 0; |
1547 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0, expires, | |
1548 | rt->dst.error) < 0) | |
e3703b3d | 1549 | goto rtattr_failure; |
c7537967 | 1550 | if (dn_is_input_route(rt)) |
bef55aeb | 1551 | RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fld.flowidn_iif); |
1da177e4 | 1552 | |
27a884dc | 1553 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1554 | return skb->len; |
1555 | ||
1556 | nlmsg_failure: | |
1557 | rtattr_failure: | |
dc5fc579 | 1558 | nlmsg_trim(skb, b); |
429eb0fa | 1559 | return -1; |
1da177e4 LT |
1560 | } |
1561 | ||
1562 | /* | |
1563 | * This is called by both endnodes and routers now. | |
1564 | */ | |
fa34ddd7 | 1565 | static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 1566 | { |
3b1e0a65 | 1567 | struct net *net = sock_net(in_skb->sk); |
1da177e4 LT |
1568 | struct rtattr **rta = arg; |
1569 | struct rtmsg *rtm = NLMSG_DATA(nlh); | |
1570 | struct dn_route *rt = NULL; | |
1571 | struct dn_skb_cb *cb; | |
1572 | int err; | |
1573 | struct sk_buff *skb; | |
bef55aeb | 1574 | struct flowidn fld; |
1da177e4 | 1575 | |
09ad9bc7 | 1576 | if (!net_eq(net, &init_net)) |
b854272b DL |
1577 | return -EINVAL; |
1578 | ||
bef55aeb DM |
1579 | memset(&fld, 0, sizeof(fld)); |
1580 | fld.flowidn_proto = DNPROTO_NSP; | |
1da177e4 LT |
1581 | |
1582 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1583 | if (skb == NULL) | |
1584 | return -ENOBUFS; | |
459a98ed | 1585 | skb_reset_mac_header(skb); |
1da177e4 LT |
1586 | cb = DN_SKB_CB(skb); |
1587 | ||
1588 | if (rta[RTA_SRC-1]) | |
bef55aeb | 1589 | memcpy(&fld.saddr, RTA_DATA(rta[RTA_SRC-1]), 2); |
1da177e4 | 1590 | if (rta[RTA_DST-1]) |
bef55aeb | 1591 | memcpy(&fld.daddr, RTA_DATA(rta[RTA_DST-1]), 2); |
1da177e4 | 1592 | if (rta[RTA_IIF-1]) |
bef55aeb | 1593 | memcpy(&fld.flowidn_iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); |
1da177e4 | 1594 | |
bef55aeb | 1595 | if (fld.flowidn_iif) { |
1da177e4 | 1596 | struct net_device *dev; |
bef55aeb | 1597 | if ((dev = dev_get_by_index(&init_net, fld.flowidn_iif)) == NULL) { |
1da177e4 LT |
1598 | kfree_skb(skb); |
1599 | return -ENODEV; | |
1600 | } | |
1601 | if (!dev->dn_ptr) { | |
1602 | dev_put(dev); | |
1603 | kfree_skb(skb); | |
1604 | return -ENODEV; | |
1605 | } | |
b98999dc | 1606 | skb->protocol = htons(ETH_P_DNA_RT); |
1da177e4 | 1607 | skb->dev = dev; |
bef55aeb DM |
1608 | cb->src = fld.saddr; |
1609 | cb->dst = fld.daddr; | |
1da177e4 LT |
1610 | local_bh_disable(); |
1611 | err = dn_route_input(skb); | |
1612 | local_bh_enable(); | |
1613 | memset(cb, 0, sizeof(struct dn_skb_cb)); | |
adf30907 | 1614 | rt = (struct dn_route *)skb_dst(skb); |
d8d1f30b CG |
1615 | if (!err && -rt->dst.error) |
1616 | err = rt->dst.error; | |
1da177e4 LT |
1617 | } else { |
1618 | int oif = 0; | |
1619 | if (rta[RTA_OIF - 1]) | |
1620 | memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int)); | |
bef55aeb DM |
1621 | fld.flowidn_oif = oif; |
1622 | err = dn_route_output_key((struct dst_entry **)&rt, &fld, 0); | |
1da177e4 LT |
1623 | } |
1624 | ||
1625 | if (skb->dev) | |
1626 | dev_put(skb->dev); | |
1627 | skb->dev = NULL; | |
1628 | if (err) | |
1629 | goto out_free; | |
d8d1f30b | 1630 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
1631 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
1632 | rt->rt_flags |= RTCF_NOTIFY; | |
1633 | ||
b6544c0b | 1634 | err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0); |
1da177e4 LT |
1635 | |
1636 | if (err == 0) | |
1637 | goto out_free; | |
1638 | if (err < 0) { | |
1639 | err = -EMSGSIZE; | |
1640 | goto out_free; | |
1641 | } | |
1642 | ||
97c53cac | 1643 | return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
1da177e4 LT |
1644 | |
1645 | out_free: | |
1646 | kfree_skb(skb); | |
1647 | return err; | |
1648 | } | |
1649 | ||
1650 | /* | |
1651 | * For routers, this is called from dn_fib_dump, but for endnodes its | |
1652 | * called directly from the rtnetlink dispatch table. | |
1653 | */ | |
1654 | int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1655 | { | |
3b1e0a65 | 1656 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1657 | struct dn_route *rt; |
1658 | int h, s_h; | |
1659 | int idx, s_idx; | |
1660 | ||
09ad9bc7 | 1661 | if (!net_eq(net, &init_net)) |
b854272b DL |
1662 | return 0; |
1663 | ||
1da177e4 LT |
1664 | if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg)) |
1665 | return -EINVAL; | |
1666 | if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)) | |
1667 | return 0; | |
1668 | ||
1669 | s_h = cb->args[0]; | |
1670 | s_idx = idx = cb->args[1]; | |
1671 | for(h = 0; h <= dn_rt_hash_mask; h++) { | |
1672 | if (h < s_h) | |
1673 | continue; | |
1674 | if (h > s_h) | |
1675 | s_idx = 0; | |
1676 | rcu_read_lock_bh(); | |
a898def2 | 1677 | for(rt = rcu_dereference_bh(dn_rt_hash_table[h].chain), idx = 0; |
1da177e4 | 1678 | rt; |
d8d1f30b | 1679 | rt = rcu_dereference_bh(rt->dst.dn_next), idx++) { |
1da177e4 LT |
1680 | if (idx < s_idx) |
1681 | continue; | |
d8d1f30b | 1682 | skb_dst_set(skb, dst_clone(&rt->dst)); |
1da177e4 | 1683 | if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid, |
429eb0fa | 1684 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 1685 | 1, NLM_F_MULTI) <= 0) { |
adf30907 | 1686 | skb_dst_drop(skb); |
1da177e4 LT |
1687 | rcu_read_unlock_bh(); |
1688 | goto done; | |
1689 | } | |
adf30907 | 1690 | skb_dst_drop(skb); |
1da177e4 LT |
1691 | } |
1692 | rcu_read_unlock_bh(); | |
1693 | } | |
1694 | ||
1695 | done: | |
1696 | cb->args[0] = h; | |
1697 | cb->args[1] = idx; | |
1698 | return skb->len; | |
1699 | } | |
1700 | ||
1701 | #ifdef CONFIG_PROC_FS | |
1702 | struct dn_rt_cache_iter_state { | |
1703 | int bucket; | |
1704 | }; | |
1705 | ||
1706 | static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq) | |
1707 | { | |
1708 | struct dn_route *rt = NULL; | |
1709 | struct dn_rt_cache_iter_state *s = seq->private; | |
1710 | ||
1711 | for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) { | |
1712 | rcu_read_lock_bh(); | |
a898def2 | 1713 | rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); |
1da177e4 LT |
1714 | if (rt) |
1715 | break; | |
1716 | rcu_read_unlock_bh(); | |
1717 | } | |
a898def2 | 1718 | return rt; |
1da177e4 LT |
1719 | } |
1720 | ||
1721 | static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt) | |
1722 | { | |
0d89d794 | 1723 | struct dn_rt_cache_iter_state *s = seq->private; |
1da177e4 | 1724 | |
fc766e4c ED |
1725 | rt = rcu_dereference_bh(rt->dst.dn_next); |
1726 | while (!rt) { | |
1da177e4 LT |
1727 | rcu_read_unlock_bh(); |
1728 | if (--s->bucket < 0) | |
1729 | break; | |
1730 | rcu_read_lock_bh(); | |
fc766e4c | 1731 | rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); |
1da177e4 | 1732 | } |
fc766e4c | 1733 | return rt; |
1da177e4 LT |
1734 | } |
1735 | ||
1736 | static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
1737 | { | |
1738 | struct dn_route *rt = dn_rt_cache_get_first(seq); | |
1739 | ||
1740 | if (rt) { | |
1741 | while(*pos && (rt = dn_rt_cache_get_next(seq, rt))) | |
1742 | --*pos; | |
1743 | } | |
1744 | return *pos ? NULL : rt; | |
1745 | } | |
1746 | ||
1747 | static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1748 | { | |
1749 | struct dn_route *rt = dn_rt_cache_get_next(seq, v); | |
1750 | ++*pos; | |
1751 | return rt; | |
1752 | } | |
1753 | ||
1754 | static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v) | |
1755 | { | |
1756 | if (v) | |
1757 | rcu_read_unlock_bh(); | |
1758 | } | |
1759 | ||
1760 | static int dn_rt_cache_seq_show(struct seq_file *seq, void *v) | |
1761 | { | |
1762 | struct dn_route *rt = v; | |
1763 | char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN]; | |
1764 | ||
1765 | seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n", | |
d8d1f30b | 1766 | rt->dst.dev ? rt->dst.dev->name : "*", |
c4106aa8 HH |
1767 | dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1), |
1768 | dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2), | |
d8d1f30b CG |
1769 | atomic_read(&rt->dst.__refcnt), |
1770 | rt->dst.__use, | |
1771 | (int) dst_metric(&rt->dst, RTAX_RTT)); | |
1da177e4 | 1772 | return 0; |
429eb0fa | 1773 | } |
1da177e4 | 1774 | |
56b3d975 | 1775 | static const struct seq_operations dn_rt_cache_seq_ops = { |
1da177e4 LT |
1776 | .start = dn_rt_cache_seq_start, |
1777 | .next = dn_rt_cache_seq_next, | |
1778 | .stop = dn_rt_cache_seq_stop, | |
1779 | .show = dn_rt_cache_seq_show, | |
1780 | }; | |
1781 | ||
1782 | static int dn_rt_cache_seq_open(struct inode *inode, struct file *file) | |
1783 | { | |
31164088 PE |
1784 | return seq_open_private(file, &dn_rt_cache_seq_ops, |
1785 | sizeof(struct dn_rt_cache_iter_state)); | |
1da177e4 LT |
1786 | } |
1787 | ||
9a32144e | 1788 | static const struct file_operations dn_rt_cache_seq_fops = { |
1da177e4 LT |
1789 | .owner = THIS_MODULE, |
1790 | .open = dn_rt_cache_seq_open, | |
1791 | .read = seq_read, | |
1792 | .llseek = seq_lseek, | |
1793 | .release = seq_release_private, | |
1794 | }; | |
1795 | ||
1796 | #endif /* CONFIG_PROC_FS */ | |
1797 | ||
1798 | void __init dn_route_init(void) | |
1799 | { | |
1800 | int i, goal, order; | |
1801 | ||
e5d679f3 AD |
1802 | dn_dst_ops.kmem_cachep = |
1803 | kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0, | |
20c2df83 | 1804 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
fc66f95c | 1805 | dst_entries_init(&dn_dst_ops); |
b24b8a24 | 1806 | setup_timer(&dn_route_timer, dn_dst_check_expire, 0); |
1da177e4 LT |
1807 | dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; |
1808 | add_timer(&dn_route_timer); | |
1809 | ||
4481374c | 1810 | goal = totalram_pages >> (26 - PAGE_SHIFT); |
1da177e4 LT |
1811 | |
1812 | for(order = 0; (1UL << order) < goal; order++) | |
1813 | /* NOTHING */; | |
1814 | ||
429eb0fa YH |
1815 | /* |
1816 | * Only want 1024 entries max, since the table is very, very unlikely | |
1817 | * to be larger than that. | |
1818 | */ | |
1819 | while(order && ((((1UL << order) * PAGE_SIZE) / | |
1820 | sizeof(struct dn_rt_hash_bucket)) >= 2048)) | |
1821 | order--; | |
1822 | ||
1823 | do { | |
1824 | dn_rt_hash_mask = (1UL << order) * PAGE_SIZE / | |
1825 | sizeof(struct dn_rt_hash_bucket); | |
1826 | while(dn_rt_hash_mask & (dn_rt_hash_mask - 1)) | |
1827 | dn_rt_hash_mask--; | |
1828 | dn_rt_hash_table = (struct dn_rt_hash_bucket *) | |
1829 | __get_free_pages(GFP_ATOMIC, order); | |
1830 | } while (dn_rt_hash_table == NULL && --order > 0); | |
1da177e4 LT |
1831 | |
1832 | if (!dn_rt_hash_table) | |
429eb0fa | 1833 | panic("Failed to allocate DECnet route cache hash table\n"); |
1da177e4 | 1834 | |
429eb0fa YH |
1835 | printk(KERN_INFO |
1836 | "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n", | |
1837 | dn_rt_hash_mask, | |
1da177e4 LT |
1838 | (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024); |
1839 | ||
1840 | dn_rt_hash_mask--; | |
429eb0fa YH |
1841 | for(i = 0; i <= dn_rt_hash_mask; i++) { |
1842 | spin_lock_init(&dn_rt_hash_table[i].lock); | |
1843 | dn_rt_hash_table[i].chain = NULL; | |
1844 | } | |
1da177e4 | 1845 | |
429eb0fa | 1846 | dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1); |
1da177e4 | 1847 | |
457c4cbc | 1848 | proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops); |
fa34ddd7 TG |
1849 | |
1850 | #ifdef CONFIG_DECNET_ROUTER | |
1851 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, dn_fib_dump); | |
1852 | #else | |
1853 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, | |
1854 | dn_cache_dump); | |
1855 | #endif | |
1da177e4 LT |
1856 | } |
1857 | ||
1858 | void __exit dn_route_cleanup(void) | |
1859 | { | |
1860 | del_timer(&dn_route_timer); | |
1861 | dn_run_flush(0); | |
1862 | ||
457c4cbc | 1863 | proc_net_remove(&init_net, "decnet_cache"); |
fc66f95c | 1864 | dst_entries_destroy(&dn_dst_ops); |
1da177e4 LT |
1865 | } |
1866 |