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