Commit | Line | Data |
---|---|---|
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> | |
bc3b2d7f | 80 | #include <linux/export.h> |
1da177e4 | 81 | #include <asm/errno.h> |
457c4cbc | 82 | #include <net/net_namespace.h> |
dc5fc579 | 83 | #include <net/netlink.h> |
1da177e4 LT |
84 | #include <net/neighbour.h> |
85 | #include <net/dst.h> | |
86 | #include <net/flow.h> | |
a8731cbf | 87 | #include <net/fib_rules.h> |
1da177e4 LT |
88 | #include <net/dn.h> |
89 | #include <net/dn_dev.h> | |
90 | #include <net/dn_nsp.h> | |
91 | #include <net/dn_route.h> | |
92 | #include <net/dn_neigh.h> | |
93 | #include <net/dn_fib.h> | |
94 | ||
95 | struct dn_rt_hash_bucket | |
96 | { | |
fc766e4c | 97 | struct dn_route __rcu *chain; |
1da177e4 | 98 | spinlock_t lock; |
fca09fb7 | 99 | }; |
1da177e4 LT |
100 | |
101 | extern struct neigh_table dn_neigh_table; | |
102 | ||
103 | ||
104 | static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00}; | |
105 | ||
106 | static const int dn_rt_min_delay = 2 * HZ; | |
107 | static const int dn_rt_max_delay = 10 * HZ; | |
108 | static const int dn_rt_mtu_expires = 10 * 60 * HZ; | |
109 | ||
110 | static unsigned long dn_rt_deadline; | |
111 | ||
569d3645 | 112 | static int dn_dst_gc(struct dst_ops *ops); |
1da177e4 | 113 | static struct dst_entry *dn_dst_check(struct dst_entry *, __u32); |
0dbaee3b | 114 | static unsigned int dn_dst_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 115 | static unsigned int dn_dst_mtu(const struct dst_entry *dst); |
62fa8a84 | 116 | static void dn_dst_destroy(struct dst_entry *); |
fccd7d5c | 117 | static void dn_dst_ifdown(struct dst_entry *, struct net_device *dev, int how); |
1da177e4 LT |
118 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *); |
119 | static void dn_dst_link_failure(struct sk_buff *); | |
120 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu); | |
b587ee3b | 121 | static void dn_dst_redirect(struct dst_entry *dst, struct sk_buff *skb); |
f894cbf8 DM |
122 | static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, |
123 | struct sk_buff *skb, | |
124 | const void *daddr); | |
1da177e4 LT |
125 | static int dn_route_input(struct sk_buff *); |
126 | static void dn_run_flush(unsigned long dummy); | |
127 | ||
128 | static struct dn_rt_hash_bucket *dn_rt_hash_table; | |
95c96174 | 129 | static unsigned int dn_rt_hash_mask; |
1da177e4 LT |
130 | |
131 | static struct timer_list dn_route_timer; | |
8d06afab | 132 | static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0); |
1da177e4 LT |
133 | int decnet_dst_gc_interval = 2; |
134 | ||
135 | static struct dst_ops dn_dst_ops = { | |
136 | .family = PF_DECnet, | |
09640e63 | 137 | .protocol = cpu_to_be16(ETH_P_DNA_RT), |
1da177e4 LT |
138 | .gc_thresh = 128, |
139 | .gc = dn_dst_gc, | |
140 | .check = dn_dst_check, | |
0dbaee3b | 141 | .default_advmss = dn_dst_default_advmss, |
ebb762f2 | 142 | .mtu = dn_dst_mtu, |
62fa8a84 DM |
143 | .cow_metrics = dst_cow_metrics_generic, |
144 | .destroy = dn_dst_destroy, | |
fccd7d5c | 145 | .ifdown = dn_dst_ifdown, |
1da177e4 LT |
146 | .negative_advice = dn_dst_negative_advice, |
147 | .link_failure = dn_dst_link_failure, | |
148 | .update_pmtu = dn_dst_update_pmtu, | |
b587ee3b | 149 | .redirect = dn_dst_redirect, |
d3aaeb38 | 150 | .neigh_lookup = dn_dst_neigh_lookup, |
1da177e4 LT |
151 | }; |
152 | ||
62fa8a84 DM |
153 | static void dn_dst_destroy(struct dst_entry *dst) |
154 | { | |
fccd7d5c DM |
155 | struct dn_route *rt = (struct dn_route *) dst; |
156 | ||
157 | if (rt->n) | |
158 | neigh_release(rt->n); | |
62fa8a84 DM |
159 | dst_destroy_metrics_generic(dst); |
160 | } | |
161 | ||
fccd7d5c DM |
162 | static void dn_dst_ifdown(struct dst_entry *dst, struct net_device *dev, int how) |
163 | { | |
164 | if (how) { | |
165 | struct dn_route *rt = (struct dn_route *) dst; | |
166 | struct neighbour *n = rt->n; | |
167 | ||
168 | if (n && n->dev == dev) { | |
169 | n->dev = dev_net(dev)->loopback_dev; | |
170 | dev_hold(n->dev); | |
171 | dev_put(dev); | |
172 | } | |
173 | } | |
174 | } | |
175 | ||
95c96174 | 176 | static __inline__ unsigned int dn_hash(__le16 src, __le16 dst) |
1da177e4 | 177 | { |
c4ea94ab | 178 | __u16 tmp = (__u16 __force)(src ^ dst); |
1da177e4 LT |
179 | tmp ^= (tmp >> 3); |
180 | tmp ^= (tmp >> 5); | |
181 | tmp ^= (tmp >> 10); | |
95c96174 | 182 | return dn_rt_hash_mask & (unsigned int)tmp; |
1da177e4 LT |
183 | } |
184 | ||
185 | static inline void dnrt_free(struct dn_route *rt) | |
186 | { | |
d8d1f30b | 187 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); |
1da177e4 LT |
188 | } |
189 | ||
190 | static inline void dnrt_drop(struct dn_route *rt) | |
191 | { | |
d8d1f30b CG |
192 | dst_release(&rt->dst); |
193 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); | |
1da177e4 LT |
194 | } |
195 | ||
196 | static void dn_dst_check_expire(unsigned long dummy) | |
197 | { | |
198 | int i; | |
fc766e4c ED |
199 | struct dn_route *rt; |
200 | struct dn_route __rcu **rtp; | |
1da177e4 LT |
201 | unsigned long now = jiffies; |
202 | unsigned long expire = 120 * HZ; | |
203 | ||
fc766e4c | 204 | for (i = 0; i <= dn_rt_hash_mask; i++) { |
1da177e4 LT |
205 | rtp = &dn_rt_hash_table[i].chain; |
206 | ||
207 | spin_lock(&dn_rt_hash_table[i].lock); | |
fc766e4c ED |
208 | while ((rt = rcu_dereference_protected(*rtp, |
209 | lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) { | |
d8d1f30b CG |
210 | if (atomic_read(&rt->dst.__refcnt) || |
211 | (now - rt->dst.lastuse) < expire) { | |
212 | rtp = &rt->dst.dn_next; | |
1da177e4 LT |
213 | continue; |
214 | } | |
d8d1f30b CG |
215 | *rtp = rt->dst.dn_next; |
216 | rt->dst.dn_next = NULL; | |
1da177e4 LT |
217 | dnrt_free(rt); |
218 | } | |
219 | spin_unlock(&dn_rt_hash_table[i].lock); | |
220 | ||
221 | if ((jiffies - now) > 0) | |
222 | break; | |
223 | } | |
224 | ||
225 | mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ); | |
226 | } | |
227 | ||
569d3645 | 228 | static int dn_dst_gc(struct dst_ops *ops) |
1da177e4 | 229 | { |
fc766e4c ED |
230 | struct dn_route *rt; |
231 | struct dn_route __rcu **rtp; | |
1da177e4 LT |
232 | int i; |
233 | unsigned long now = jiffies; | |
234 | unsigned long expire = 10 * HZ; | |
235 | ||
fc766e4c | 236 | for (i = 0; i <= dn_rt_hash_mask; i++) { |
1da177e4 LT |
237 | |
238 | spin_lock_bh(&dn_rt_hash_table[i].lock); | |
239 | rtp = &dn_rt_hash_table[i].chain; | |
240 | ||
fc766e4c ED |
241 | while ((rt = rcu_dereference_protected(*rtp, |
242 | lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) { | |
d8d1f30b CG |
243 | if (atomic_read(&rt->dst.__refcnt) || |
244 | (now - rt->dst.lastuse) < expire) { | |
245 | rtp = &rt->dst.dn_next; | |
1da177e4 LT |
246 | continue; |
247 | } | |
d8d1f30b CG |
248 | *rtp = rt->dst.dn_next; |
249 | rt->dst.dn_next = NULL; | |
1da177e4 LT |
250 | dnrt_drop(rt); |
251 | break; | |
252 | } | |
253 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
254 | } | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | /* | |
260 | * The decnet standards don't impose a particular minimum mtu, what they | |
261 | * do insist on is that the routing layer accepts a datagram of at least | |
262 | * 230 bytes long. Here we have to subtract the routing header length from | |
263 | * 230 to get the minimum acceptable mtu. If there is no neighbour, then we | |
264 | * assume the worst and use a long header size. | |
265 | * | |
266 | * We update both the mtu and the advertised mss (i.e. the segment size we | |
267 | * advertise to the other end). | |
268 | */ | |
269 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu) | |
270 | { | |
fccd7d5c DM |
271 | struct dn_route *rt = (struct dn_route *) dst; |
272 | struct neighbour *n = rt->n; | |
1da177e4 | 273 | u32 min_mtu = 230; |
69cce1d1 DM |
274 | struct dn_dev *dn; |
275 | ||
276 | dn = n ? rcu_dereference_raw(n->dev->dn_ptr) : NULL; | |
1da177e4 LT |
277 | |
278 | if (dn && dn->use_long == 0) | |
279 | min_mtu -= 6; | |
280 | else | |
281 | min_mtu -= 21; | |
282 | ||
5ffc02a1 | 283 | if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= min_mtu) { |
1da177e4 | 284 | if (!(dst_metric_locked(dst, RTAX_MTU))) { |
defb3519 | 285 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
286 | dst_set_expires(dst, dn_rt_mtu_expires); |
287 | } | |
288 | if (!(dst_metric_locked(dst, RTAX_ADVMSS))) { | |
289 | u32 mss = mtu - DN_MAX_NSP_DATA_HEADER; | |
0dbaee3b DM |
290 | u32 existing_mss = dst_metric_raw(dst, RTAX_ADVMSS); |
291 | if (!existing_mss || existing_mss > mss) | |
defb3519 | 292 | dst_metric_set(dst, RTAX_ADVMSS, mss); |
1da177e4 LT |
293 | } |
294 | } | |
295 | } | |
296 | ||
b587ee3b DM |
297 | static void dn_dst_redirect(struct dst_entry *dst, struct sk_buff *skb) |
298 | { | |
299 | } | |
300 | ||
429eb0fa | 301 | /* |
1da177e4 LT |
302 | * When a route has been marked obsolete. (e.g. routing cache flush) |
303 | */ | |
304 | static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie) | |
305 | { | |
306 | return NULL; | |
307 | } | |
308 | ||
309 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst) | |
310 | { | |
311 | dst_release(dst); | |
312 | return NULL; | |
313 | } | |
314 | ||
315 | static void dn_dst_link_failure(struct sk_buff *skb) | |
316 | { | |
1da177e4 LT |
317 | } |
318 | ||
bef55aeb | 319 | static inline int compare_keys(struct flowidn *fl1, struct flowidn *fl2) |
1da177e4 | 320 | { |
bef55aeb DM |
321 | return ((fl1->daddr ^ fl2->daddr) | |
322 | (fl1->saddr ^ fl2->saddr) | | |
323 | (fl1->flowidn_mark ^ fl2->flowidn_mark) | | |
324 | (fl1->flowidn_scope ^ fl2->flowidn_scope) | | |
325 | (fl1->flowidn_oif ^ fl2->flowidn_oif) | | |
326 | (fl1->flowidn_iif ^ fl2->flowidn_iif)) == 0; | |
1da177e4 LT |
327 | } |
328 | ||
95c96174 | 329 | static int dn_insert_route(struct dn_route *rt, unsigned int hash, struct dn_route **rp) |
1da177e4 | 330 | { |
fc766e4c ED |
331 | struct dn_route *rth; |
332 | struct dn_route __rcu **rthp; | |
1da177e4 LT |
333 | unsigned long now = jiffies; |
334 | ||
335 | rthp = &dn_rt_hash_table[hash].chain; | |
336 | ||
337 | spin_lock_bh(&dn_rt_hash_table[hash].lock); | |
fc766e4c ED |
338 | while ((rth = rcu_dereference_protected(*rthp, |
339 | lockdep_is_held(&dn_rt_hash_table[hash].lock))) != NULL) { | |
bef55aeb | 340 | if (compare_keys(&rth->fld, &rt->fld)) { |
1da177e4 | 341 | /* Put it first */ |
d8d1f30b CG |
342 | *rthp = rth->dst.dn_next; |
343 | rcu_assign_pointer(rth->dst.dn_next, | |
1da177e4 LT |
344 | dn_rt_hash_table[hash].chain); |
345 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth); | |
346 | ||
d8d1f30b | 347 | dst_use(&rth->dst, now); |
1da177e4 LT |
348 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
349 | ||
350 | dnrt_drop(rt); | |
351 | *rp = rth; | |
352 | return 0; | |
353 | } | |
d8d1f30b | 354 | rthp = &rth->dst.dn_next; |
1da177e4 LT |
355 | } |
356 | ||
d8d1f30b | 357 | rcu_assign_pointer(rt->dst.dn_next, dn_rt_hash_table[hash].chain); |
1da177e4 | 358 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt); |
429eb0fa | 359 | |
d8d1f30b | 360 | dst_use(&rt->dst, now); |
1da177e4 LT |
361 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
362 | *rp = rt; | |
363 | return 0; | |
364 | } | |
365 | ||
5eaa65b2 | 366 | static void dn_run_flush(unsigned long dummy) |
1da177e4 LT |
367 | { |
368 | int i; | |
369 | struct dn_route *rt, *next; | |
370 | ||
fc766e4c | 371 | for (i = 0; i < dn_rt_hash_mask; i++) { |
1da177e4 LT |
372 | spin_lock_bh(&dn_rt_hash_table[i].lock); |
373 | ||
fc766e4c | 374 | if ((rt = xchg((struct dn_route **)&dn_rt_hash_table[i].chain, NULL)) == NULL) |
1da177e4 LT |
375 | goto nothing_to_declare; |
376 | ||
fc766e4c ED |
377 | for(; rt; rt = next) { |
378 | next = rcu_dereference_raw(rt->dst.dn_next); | |
379 | RCU_INIT_POINTER(rt->dst.dn_next, NULL); | |
1da177e4 LT |
380 | dst_free((struct dst_entry *)rt); |
381 | } | |
382 | ||
383 | nothing_to_declare: | |
384 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
385 | } | |
386 | } | |
387 | ||
388 | static DEFINE_SPINLOCK(dn_rt_flush_lock); | |
389 | ||
390 | void dn_rt_cache_flush(int delay) | |
391 | { | |
392 | unsigned long now = jiffies; | |
393 | int user_mode = !in_interrupt(); | |
394 | ||
395 | if (delay < 0) | |
396 | delay = dn_rt_min_delay; | |
397 | ||
398 | spin_lock_bh(&dn_rt_flush_lock); | |
399 | ||
400 | if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) { | |
401 | long tmo = (long)(dn_rt_deadline - now); | |
402 | ||
403 | if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay) | |
404 | tmo = 0; | |
405 | ||
406 | if (delay > tmo) | |
407 | delay = tmo; | |
408 | } | |
409 | ||
410 | if (delay <= 0) { | |
411 | spin_unlock_bh(&dn_rt_flush_lock); | |
412 | dn_run_flush(0); | |
413 | return; | |
414 | } | |
415 | ||
416 | if (dn_rt_deadline == 0) | |
417 | dn_rt_deadline = now + dn_rt_max_delay; | |
418 | ||
419 | dn_rt_flush_timer.expires = now + delay; | |
420 | add_timer(&dn_rt_flush_timer); | |
421 | spin_unlock_bh(&dn_rt_flush_lock); | |
422 | } | |
423 | ||
424 | /** | |
425 | * dn_return_short - Return a short packet to its sender | |
426 | * @skb: The packet to return | |
427 | * | |
428 | */ | |
429 | static int dn_return_short(struct sk_buff *skb) | |
430 | { | |
431 | struct dn_skb_cb *cb; | |
432 | unsigned char *ptr; | |
c4ea94ab SW |
433 | __le16 *src; |
434 | __le16 *dst; | |
1da177e4 LT |
435 | |
436 | /* Add back headers */ | |
d56f90a7 | 437 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
438 | |
439 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) | |
440 | return NET_RX_DROP; | |
441 | ||
442 | cb = DN_SKB_CB(skb); | |
443 | /* Skip packet length and point to flags */ | |
444 | ptr = skb->data + 2; | |
445 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; | |
446 | ||
c4ea94ab | 447 | dst = (__le16 *)ptr; |
1da177e4 | 448 | ptr += 2; |
c4ea94ab | 449 | src = (__le16 *)ptr; |
1da177e4 LT |
450 | ptr += 2; |
451 | *ptr = 0; /* Zero hop count */ | |
452 | ||
a0bffffc | 453 | swap(*src, *dst); |
1da177e4 LT |
454 | |
455 | skb->pkt_type = PACKET_OUTGOING; | |
456 | dn_rt_finish_output(skb, NULL, NULL); | |
457 | return NET_RX_SUCCESS; | |
458 | } | |
459 | ||
460 | /** | |
461 | * dn_return_long - Return a long packet to its sender | |
462 | * @skb: The long format packet to return | |
463 | * | |
464 | */ | |
465 | static int dn_return_long(struct sk_buff *skb) | |
466 | { | |
467 | struct dn_skb_cb *cb; | |
468 | unsigned char *ptr; | |
469 | unsigned char *src_addr, *dst_addr; | |
470 | unsigned char tmp[ETH_ALEN]; | |
471 | ||
472 | /* Add back all headers */ | |
d56f90a7 | 473 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
474 | |
475 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) | |
476 | return NET_RX_DROP; | |
477 | ||
478 | cb = DN_SKB_CB(skb); | |
479 | /* Ignore packet length and point to flags */ | |
480 | ptr = skb->data + 2; | |
481 | ||
482 | /* Skip padding */ | |
483 | if (*ptr & DN_RT_F_PF) { | |
484 | char padlen = (*ptr & ~DN_RT_F_PF); | |
485 | ptr += padlen; | |
486 | } | |
487 | ||
488 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; | |
489 | ptr += 2; | |
490 | dst_addr = ptr; | |
491 | ptr += 8; | |
492 | src_addr = ptr; | |
493 | ptr += 6; | |
494 | *ptr = 0; /* Zero hop count */ | |
495 | ||
496 | /* Swap source and destination */ | |
497 | memcpy(tmp, src_addr, ETH_ALEN); | |
498 | memcpy(src_addr, dst_addr, ETH_ALEN); | |
499 | memcpy(dst_addr, tmp, ETH_ALEN); | |
500 | ||
501 | skb->pkt_type = PACKET_OUTGOING; | |
502 | dn_rt_finish_output(skb, dst_addr, src_addr); | |
503 | return NET_RX_SUCCESS; | |
504 | } | |
505 | ||
506 | /** | |
507 | * dn_route_rx_packet - Try and find a route for an incoming packet | |
508 | * @skb: The packet to find a route for | |
509 | * | |
510 | * Returns: result of input function if route is found, error code otherwise | |
511 | */ | |
512 | static int dn_route_rx_packet(struct sk_buff *skb) | |
513 | { | |
fc766e4c | 514 | struct dn_skb_cb *cb; |
1da177e4 LT |
515 | int err; |
516 | ||
517 | if ((err = dn_route_input(skb)) == 0) | |
518 | return dst_input(skb); | |
519 | ||
fc766e4c | 520 | cb = DN_SKB_CB(skb); |
1da177e4 LT |
521 | if (decnet_debug_level & 4) { |
522 | char *devname = skb->dev ? skb->dev->name : "???"; | |
fc766e4c | 523 | |
1da177e4 LT |
524 | printk(KERN_DEBUG |
525 | "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 | 526 | (int)cb->rt_flags, devname, skb->len, |
c4106aa8 | 527 | le16_to_cpu(cb->src), le16_to_cpu(cb->dst), |
1da177e4 LT |
528 | err, skb->pkt_type); |
529 | } | |
530 | ||
531 | if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) { | |
06f8fe11 JP |
532 | switch (cb->rt_flags & DN_RT_PKT_MSK) { |
533 | case DN_RT_PKT_SHORT: | |
534 | return dn_return_short(skb); | |
535 | case DN_RT_PKT_LONG: | |
536 | return dn_return_long(skb); | |
1da177e4 LT |
537 | } |
538 | } | |
539 | ||
540 | kfree_skb(skb); | |
541 | return NET_RX_DROP; | |
542 | } | |
543 | ||
544 | static int dn_route_rx_long(struct sk_buff *skb) | |
545 | { | |
546 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
547 | unsigned char *ptr = skb->data; | |
548 | ||
549 | if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */ | |
550 | goto drop_it; | |
551 | ||
552 | skb_pull(skb, 20); | |
badff6d0 | 553 | skb_reset_transport_header(skb); |
1da177e4 | 554 | |
429eb0fa YH |
555 | /* Destination info */ |
556 | ptr += 2; | |
c4ea94ab | 557 | cb->dst = dn_eth2dn(ptr); |
429eb0fa YH |
558 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
559 | goto drop_it; | |
560 | ptr += 6; | |
1da177e4 LT |
561 | |
562 | ||
429eb0fa YH |
563 | /* Source info */ |
564 | ptr += 2; | |
c4ea94ab | 565 | cb->src = dn_eth2dn(ptr); |
429eb0fa YH |
566 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
567 | goto drop_it; | |
568 | ptr += 6; | |
569 | /* Other junk */ | |
570 | ptr++; | |
571 | cb->hops = *ptr++; /* Visit Count */ | |
1da177e4 | 572 | |
5d877d87 JE |
573 | return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, |
574 | dn_route_rx_packet); | |
1da177e4 LT |
575 | |
576 | drop_it: | |
577 | kfree_skb(skb); | |
578 | return NET_RX_DROP; | |
579 | } | |
580 | ||
581 | ||
582 | ||
583 | static int dn_route_rx_short(struct sk_buff *skb) | |
584 | { | |
585 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
586 | unsigned char *ptr = skb->data; | |
587 | ||
588 | if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */ | |
589 | goto drop_it; | |
590 | ||
591 | skb_pull(skb, 5); | |
badff6d0 | 592 | skb_reset_transport_header(skb); |
1da177e4 | 593 | |
c4ea94ab | 594 | cb->dst = *(__le16 *)ptr; |
429eb0fa YH |
595 | ptr += 2; |
596 | cb->src = *(__le16 *)ptr; | |
597 | ptr += 2; | |
598 | cb->hops = *ptr & 0x3f; | |
1da177e4 | 599 | |
5d877d87 JE |
600 | return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, |
601 | dn_route_rx_packet); | |
1da177e4 LT |
602 | |
603 | drop_it: | |
429eb0fa YH |
604 | kfree_skb(skb); |
605 | return NET_RX_DROP; | |
1da177e4 LT |
606 | } |
607 | ||
608 | static int dn_route_discard(struct sk_buff *skb) | |
609 | { | |
610 | /* | |
611 | * I know we drop the packet here, but thats considered success in | |
612 | * this case | |
613 | */ | |
614 | kfree_skb(skb); | |
615 | return NET_RX_SUCCESS; | |
616 | } | |
617 | ||
618 | static int dn_route_ptp_hello(struct sk_buff *skb) | |
619 | { | |
620 | dn_dev_hello(skb); | |
621 | dn_neigh_pointopoint_hello(skb); | |
622 | return NET_RX_SUCCESS; | |
623 | } | |
624 | ||
f2ccd8fa | 625 | int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
626 | { |
627 | struct dn_skb_cb *cb; | |
628 | unsigned char flags = 0; | |
c4106aa8 | 629 | __u16 len = le16_to_cpu(*(__le16 *)skb->data); |
fc766e4c | 630 | struct dn_dev *dn = rcu_dereference(dev->dn_ptr); |
1da177e4 LT |
631 | unsigned char padlen = 0; |
632 | ||
721499e8 | 633 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
634 | goto dump_it; |
635 | ||
1da177e4 LT |
636 | if (dn == NULL) |
637 | goto dump_it; | |
638 | ||
639 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
640 | goto out; | |
641 | ||
642 | if (!pskb_may_pull(skb, 3)) | |
643 | goto dump_it; | |
644 | ||
645 | skb_pull(skb, 2); | |
646 | ||
647 | if (len > skb->len) | |
648 | goto dump_it; | |
649 | ||
650 | skb_trim(skb, len); | |
651 | ||
652 | flags = *skb->data; | |
653 | ||
654 | cb = DN_SKB_CB(skb); | |
655 | cb->stamp = jiffies; | |
656 | cb->iif = dev->ifindex; | |
657 | ||
658 | /* | |
659 | * If we have padding, remove it. | |
660 | */ | |
661 | if (flags & DN_RT_F_PF) { | |
662 | padlen = flags & ~DN_RT_F_PF; | |
663 | if (!pskb_may_pull(skb, padlen + 1)) | |
664 | goto dump_it; | |
665 | skb_pull(skb, padlen); | |
666 | flags = *skb->data; | |
667 | } | |
668 | ||
c1d2bbe1 | 669 | skb_reset_network_header(skb); |
1da177e4 LT |
670 | |
671 | /* | |
672 | * Weed out future version DECnet | |
673 | */ | |
674 | if (flags & DN_RT_F_VER) | |
675 | goto dump_it; | |
676 | ||
677 | cb->rt_flags = flags; | |
678 | ||
679 | if (decnet_debug_level & 1) | |
429eb0fa | 680 | printk(KERN_DEBUG |
1da177e4 | 681 | "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n", |
429eb0fa | 682 | (int)flags, (dev) ? dev->name : "???", len, skb->len, |
1da177e4 LT |
683 | padlen); |
684 | ||
429eb0fa | 685 | if (flags & DN_RT_PKT_CNTL) { |
364c6bad | 686 | if (unlikely(skb_linearize(skb))) |
1da177e4 LT |
687 | goto dump_it; |
688 | ||
06f8fe11 JP |
689 | switch (flags & DN_RT_CNTL_MSK) { |
690 | case DN_RT_PKT_INIT: | |
691 | dn_dev_init_pkt(skb); | |
692 | break; | |
693 | case DN_RT_PKT_VERI: | |
694 | dn_dev_veri_pkt(skb); | |
695 | break; | |
1da177e4 LT |
696 | } |
697 | ||
698 | if (dn->parms.state != DN_DEV_S_RU) | |
699 | goto dump_it; | |
700 | ||
06f8fe11 JP |
701 | switch (flags & DN_RT_CNTL_MSK) { |
702 | case DN_RT_PKT_HELO: | |
703 | return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, | |
704 | skb, skb->dev, NULL, | |
705 | dn_route_ptp_hello); | |
706 | ||
707 | case DN_RT_PKT_L1RT: | |
708 | case DN_RT_PKT_L2RT: | |
709 | return NF_HOOK(NFPROTO_DECNET, NF_DN_ROUTE, | |
710 | skb, skb->dev, NULL, | |
711 | dn_route_discard); | |
712 | case DN_RT_PKT_ERTH: | |
713 | return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, | |
714 | skb, skb->dev, NULL, | |
715 | dn_neigh_router_hello); | |
716 | ||
717 | case DN_RT_PKT_EEDH: | |
718 | return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, | |
719 | skb, skb->dev, NULL, | |
720 | dn_neigh_endnode_hello); | |
429eb0fa YH |
721 | } |
722 | } else { | |
1da177e4 LT |
723 | if (dn->parms.state != DN_DEV_S_RU) |
724 | goto dump_it; | |
725 | ||
726 | skb_pull(skb, 1); /* Pull flags */ | |
727 | ||
06f8fe11 JP |
728 | switch (flags & DN_RT_PKT_MSK) { |
729 | case DN_RT_PKT_LONG: | |
730 | return dn_route_rx_long(skb); | |
731 | case DN_RT_PKT_SHORT: | |
732 | return dn_route_rx_short(skb); | |
1da177e4 | 733 | } |
429eb0fa | 734 | } |
1da177e4 LT |
735 | |
736 | dump_it: | |
737 | kfree_skb(skb); | |
738 | out: | |
739 | return NET_RX_DROP; | |
740 | } | |
741 | ||
8f40b161 DM |
742 | static int dn_to_neigh_output(struct sk_buff *skb) |
743 | { | |
744 | struct dst_entry *dst = skb_dst(skb); | |
fccd7d5c DM |
745 | struct dn_route *rt = (struct dn_route *) dst; |
746 | struct neighbour *n = rt->n; | |
8f40b161 DM |
747 | |
748 | return n->output(n, skb); | |
749 | } | |
750 | ||
1da177e4 LT |
751 | static int dn_output(struct sk_buff *skb) |
752 | { | |
adf30907 | 753 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
754 | struct dn_route *rt = (struct dn_route *)dst; |
755 | struct net_device *dev = dst->dev; | |
756 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1da177e4 LT |
757 | |
758 | int err = -EINVAL; | |
759 | ||
fccd7d5c | 760 | if (rt->n == NULL) |
1da177e4 LT |
761 | goto error; |
762 | ||
763 | skb->dev = dev; | |
764 | ||
765 | cb->src = rt->rt_saddr; | |
766 | cb->dst = rt->rt_daddr; | |
767 | ||
768 | /* | |
769 | * Always set the Intra-Ethernet bit on all outgoing packets | |
770 | * originated on this node. Only valid flag from upper layers | |
771 | * is return-to-sender-requested. Set hop count to 0 too. | |
772 | */ | |
773 | cb->rt_flags &= ~DN_RT_F_RQR; | |
774 | cb->rt_flags |= DN_RT_F_IE; | |
775 | cb->hops = 0; | |
776 | ||
5d877d87 | 777 | return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_OUT, skb, NULL, dev, |
8f40b161 | 778 | dn_to_neigh_output); |
1da177e4 LT |
779 | |
780 | error: | |
e87cc472 | 781 | net_dbg_ratelimited("dn_output: This should not happen\n"); |
1da177e4 LT |
782 | |
783 | kfree_skb(skb); | |
784 | ||
785 | return err; | |
786 | } | |
787 | ||
788 | static int dn_forward(struct sk_buff *skb) | |
789 | { | |
790 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
adf30907 | 791 | struct dst_entry *dst = skb_dst(skb); |
fc766e4c | 792 | struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr); |
1da177e4 | 793 | struct dn_route *rt; |
1da177e4 LT |
794 | int header_len; |
795 | #ifdef CONFIG_NETFILTER | |
796 | struct net_device *dev = skb->dev; | |
797 | #endif | |
798 | ||
799 | if (skb->pkt_type != PACKET_HOST) | |
800 | goto drop; | |
801 | ||
802 | /* Ensure that we have enough space for headers */ | |
adf30907 | 803 | rt = (struct dn_route *)skb_dst(skb); |
1da177e4 | 804 | header_len = dn_db->use_long ? 21 : 6; |
d8d1f30b | 805 | if (skb_cow(skb, LL_RESERVED_SPACE(rt->dst.dev)+header_len)) |
1da177e4 LT |
806 | goto drop; |
807 | ||
808 | /* | |
809 | * Hop count exceeded. | |
810 | */ | |
811 | if (++cb->hops > 30) | |
812 | goto drop; | |
813 | ||
d8d1f30b | 814 | skb->dev = rt->dst.dev; |
1da177e4 LT |
815 | |
816 | /* | |
817 | * If packet goes out same interface it came in on, then set | |
818 | * the Intra-Ethernet bit. This has no effect for short | |
819 | * packets, so we don't need to test for them here. | |
820 | */ | |
821 | cb->rt_flags &= ~DN_RT_F_IE; | |
822 | if (rt->rt_flags & RTCF_DOREDIRECT) | |
823 | cb->rt_flags |= DN_RT_F_IE; | |
824 | ||
5d877d87 | 825 | return NF_HOOK(NFPROTO_DECNET, NF_DN_FORWARD, skb, dev, skb->dev, |
8f40b161 | 826 | dn_to_neigh_output); |
1da177e4 LT |
827 | |
828 | drop: | |
829 | kfree_skb(skb); | |
830 | return NET_RX_DROP; | |
831 | } | |
832 | ||
1da177e4 LT |
833 | /* |
834 | * Used to catch bugs. This should never normally get | |
835 | * called. | |
836 | */ | |
837 | static int dn_rt_bug(struct sk_buff *skb) | |
838 | { | |
e87cc472 | 839 | struct dn_skb_cb *cb = DN_SKB_CB(skb); |
1da177e4 | 840 | |
e87cc472 JP |
841 | net_dbg_ratelimited("dn_rt_bug: skb from:%04x to:%04x\n", |
842 | le16_to_cpu(cb->src), le16_to_cpu(cb->dst)); | |
1da177e4 LT |
843 | |
844 | kfree_skb(skb); | |
845 | ||
0e8635a8 | 846 | return NET_RX_DROP; |
1da177e4 LT |
847 | } |
848 | ||
0dbaee3b DM |
849 | static unsigned int dn_dst_default_advmss(const struct dst_entry *dst) |
850 | { | |
851 | return dn_mss_from_pmtu(dst->dev, dst_mtu(dst)); | |
852 | } | |
853 | ||
ebb762f2 | 854 | static unsigned int dn_dst_mtu(const struct dst_entry *dst) |
d33e4553 | 855 | { |
618f9bc7 SK |
856 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
857 | ||
858 | return mtu ? : dst->dev->mtu; | |
d33e4553 DM |
859 | } |
860 | ||
f894cbf8 DM |
861 | static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, |
862 | struct sk_buff *skb, | |
863 | const void *daddr) | |
d3aaeb38 DM |
864 | { |
865 | return __neigh_lookup_errno(&dn_neigh_table, daddr, dst->dev); | |
866 | } | |
867 | ||
1da177e4 LT |
868 | static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res) |
869 | { | |
870 | struct dn_fib_info *fi = res->fi; | |
d8d1f30b | 871 | struct net_device *dev = rt->dst.dev; |
62fa8a84 | 872 | unsigned int mss_metric; |
1da177e4 | 873 | struct neighbour *n; |
1da177e4 LT |
874 | |
875 | if (fi) { | |
876 | if (DN_FIB_RES_GW(*res) && | |
877 | DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
878 | rt->rt_gateway = DN_FIB_RES_GW(*res); | |
62fa8a84 | 879 | dst_init_metrics(&rt->dst, fi->fib_metrics, true); |
1da177e4 LT |
880 | } |
881 | rt->rt_type = res->type; | |
882 | ||
fccd7d5c | 883 | if (dev != NULL && rt->n == NULL) { |
1da177e4 LT |
884 | n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev); |
885 | if (IS_ERR(n)) | |
886 | return PTR_ERR(n); | |
fccd7d5c | 887 | rt->n = n; |
1da177e4 LT |
888 | } |
889 | ||
d33e4553 | 890 | if (dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu) |
defb3519 | 891 | dst_metric_set(&rt->dst, RTAX_MTU, rt->dst.dev->mtu); |
62fa8a84 DM |
892 | mss_metric = dst_metric_raw(&rt->dst, RTAX_ADVMSS); |
893 | if (mss_metric) { | |
0dbaee3b | 894 | unsigned int mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->dst)); |
62fa8a84 | 895 | if (mss_metric > mss) |
0dbaee3b DM |
896 | dst_metric_set(&rt->dst, RTAX_ADVMSS, mss); |
897 | } | |
1da177e4 LT |
898 | return 0; |
899 | } | |
900 | ||
c4ea94ab | 901 | static inline int dn_match_addr(__le16 addr1, __le16 addr2) |
1da177e4 | 902 | { |
c4106aa8 | 903 | __u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(addr2); |
1da177e4 LT |
904 | int match = 16; |
905 | while(tmp) { | |
906 | tmp >>= 1; | |
907 | match--; | |
908 | } | |
909 | return match; | |
910 | } | |
911 | ||
c4ea94ab | 912 | static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope) |
1da177e4 | 913 | { |
c4ea94ab | 914 | __le16 saddr = 0; |
fc766e4c | 915 | struct dn_dev *dn_db; |
1da177e4 LT |
916 | struct dn_ifaddr *ifa; |
917 | int best_match = 0; | |
918 | int ret; | |
919 | ||
fc766e4c ED |
920 | rcu_read_lock(); |
921 | dn_db = rcu_dereference(dev->dn_ptr); | |
922 | for (ifa = rcu_dereference(dn_db->ifa_list); | |
923 | ifa != NULL; | |
924 | ifa = rcu_dereference(ifa->ifa_next)) { | |
1da177e4 LT |
925 | if (ifa->ifa_scope > scope) |
926 | continue; | |
927 | if (!daddr) { | |
928 | saddr = ifa->ifa_local; | |
929 | break; | |
930 | } | |
931 | ret = dn_match_addr(daddr, ifa->ifa_local); | |
932 | if (ret > best_match) | |
933 | saddr = ifa->ifa_local; | |
934 | if (best_match == 0) | |
935 | saddr = ifa->ifa_local; | |
936 | } | |
fc766e4c | 937 | rcu_read_unlock(); |
1da177e4 LT |
938 | |
939 | return saddr; | |
940 | } | |
941 | ||
c4ea94ab | 942 | static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res) |
1da177e4 LT |
943 | { |
944 | return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope); | |
945 | } | |
946 | ||
c4ea94ab | 947 | static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res) |
1da177e4 | 948 | { |
c4ea94ab | 949 | __le16 mask = dnet_make_mask(res->prefixlen); |
1da177e4 LT |
950 | return (daddr&~mask)|res->fi->fib_nh->nh_gw; |
951 | } | |
952 | ||
bef55aeb | 953 | static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *oldflp, int try_hard) |
1da177e4 | 954 | { |
bef55aeb DM |
955 | struct flowidn fld = { |
956 | .daddr = oldflp->daddr, | |
957 | .saddr = oldflp->saddr, | |
958 | .flowidn_scope = RT_SCOPE_UNIVERSE, | |
959 | .flowidn_mark = oldflp->flowidn_mark, | |
960 | .flowidn_iif = init_net.loopback_dev->ifindex, | |
961 | .flowidn_oif = oldflp->flowidn_oif, | |
1d28f42c | 962 | }; |
1da177e4 | 963 | struct dn_route *rt = NULL; |
7562f876 | 964 | struct net_device *dev_out = NULL, *dev; |
1da177e4 | 965 | struct neighbour *neigh = NULL; |
95c96174 ED |
966 | unsigned int hash; |
967 | unsigned int flags = 0; | |
1da177e4 LT |
968 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST }; |
969 | int err; | |
970 | int free_res = 0; | |
c4ea94ab | 971 | __le16 gateway = 0; |
1da177e4 LT |
972 | |
973 | if (decnet_debug_level & 16) | |
974 | printk(KERN_DEBUG | |
975 | "dn_route_output_slow: dst=%04x src=%04x mark=%d" | |
bef55aeb DM |
976 | " iif=%d oif=%d\n", le16_to_cpu(oldflp->daddr), |
977 | le16_to_cpu(oldflp->saddr), | |
978 | oldflp->flowidn_mark, init_net.loopback_dev->ifindex, | |
979 | oldflp->flowidn_oif); | |
1da177e4 LT |
980 | |
981 | /* If we have an output interface, verify its a DECnet device */ | |
bef55aeb DM |
982 | if (oldflp->flowidn_oif) { |
983 | dev_out = dev_get_by_index(&init_net, oldflp->flowidn_oif); | |
1da177e4 LT |
984 | err = -ENODEV; |
985 | if (dev_out && dev_out->dn_ptr == NULL) { | |
986 | dev_put(dev_out); | |
987 | dev_out = NULL; | |
988 | } | |
989 | if (dev_out == NULL) | |
990 | goto out; | |
991 | } | |
992 | ||
993 | /* If we have a source address, verify that its a local address */ | |
bef55aeb | 994 | if (oldflp->saddr) { |
1da177e4 LT |
995 | err = -EADDRNOTAVAIL; |
996 | ||
997 | if (dev_out) { | |
bef55aeb | 998 | if (dn_dev_islocal(dev_out, oldflp->saddr)) |
1da177e4 LT |
999 | goto source_ok; |
1000 | dev_put(dev_out); | |
1001 | goto out; | |
1002 | } | |
c6d14c84 ED |
1003 | rcu_read_lock(); |
1004 | for_each_netdev_rcu(&init_net, dev) { | |
7562f876 | 1005 | if (!dev->dn_ptr) |
1da177e4 | 1006 | continue; |
bef55aeb | 1007 | if (!dn_dev_islocal(dev, oldflp->saddr)) |
9bbf28a1 | 1008 | continue; |
7562f876 | 1009 | if ((dev->flags & IFF_LOOPBACK) && |
bef55aeb DM |
1010 | oldflp->daddr && |
1011 | !dn_dev_islocal(dev, oldflp->daddr)) | |
9bbf28a1 | 1012 | continue; |
7562f876 PE |
1013 | |
1014 | dev_out = dev; | |
9bbf28a1 | 1015 | break; |
1da177e4 | 1016 | } |
c6d14c84 | 1017 | rcu_read_unlock(); |
1da177e4 LT |
1018 | if (dev_out == NULL) |
1019 | goto out; | |
1020 | dev_hold(dev_out); | |
1021 | source_ok: | |
1022 | ; | |
1023 | } | |
1024 | ||
1025 | /* No destination? Assume its local */ | |
bef55aeb DM |
1026 | if (!fld.daddr) { |
1027 | fld.daddr = fld.saddr; | |
1da177e4 LT |
1028 | |
1029 | err = -EADDRNOTAVAIL; | |
1030 | if (dev_out) | |
1031 | dev_put(dev_out); | |
2774c7ab | 1032 | dev_out = init_net.loopback_dev; |
1da177e4 | 1033 | dev_hold(dev_out); |
bef55aeb DM |
1034 | if (!fld.daddr) { |
1035 | fld.daddr = | |
1036 | fld.saddr = dnet_select_source(dev_out, 0, | |
1da177e4 | 1037 | RT_SCOPE_HOST); |
bef55aeb | 1038 | if (!fld.daddr) |
1da177e4 LT |
1039 | goto out; |
1040 | } | |
bef55aeb | 1041 | fld.flowidn_oif = init_net.loopback_dev->ifindex; |
1da177e4 LT |
1042 | res.type = RTN_LOCAL; |
1043 | goto make_route; | |
1044 | } | |
1045 | ||
1046 | if (decnet_debug_level & 16) | |
1047 | printk(KERN_DEBUG | |
1048 | "dn_route_output_slow: initial checks complete." | |
c4ea94ab | 1049 | " dst=%o4x src=%04x oif=%d try_hard=%d\n", |
bef55aeb DM |
1050 | le16_to_cpu(fld.daddr), le16_to_cpu(fld.saddr), |
1051 | fld.flowidn_oif, try_hard); | |
1da177e4 LT |
1052 | |
1053 | /* | |
1054 | * N.B. If the kernel is compiled without router support then | |
1055 | * dn_fib_lookup() will evaluate to non-zero so this if () block | |
1056 | * will always be executed. | |
1057 | */ | |
1058 | err = -ESRCH; | |
bef55aeb | 1059 | if (try_hard || (err = dn_fib_lookup(&fld, &res)) != 0) { |
1da177e4 LT |
1060 | struct dn_dev *dn_db; |
1061 | if (err != -ESRCH) | |
1062 | goto out; | |
1063 | /* | |
429eb0fa | 1064 | * Here the fallback is basically the standard algorithm for |
1da177e4 LT |
1065 | * routing in endnodes which is described in the DECnet routing |
1066 | * docs | |
1067 | * | |
1068 | * If we are not trying hard, look in neighbour cache. | |
1069 | * The result is tested to ensure that if a specific output | |
429eb0fa | 1070 | * device/source address was requested, then we honour that |
1da177e4 LT |
1071 | * here |
1072 | */ | |
1073 | if (!try_hard) { | |
bef55aeb | 1074 | neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fld.daddr); |
1da177e4 | 1075 | if (neigh) { |
bef55aeb DM |
1076 | if ((oldflp->flowidn_oif && |
1077 | (neigh->dev->ifindex != oldflp->flowidn_oif)) || | |
1078 | (oldflp->saddr && | |
1da177e4 | 1079 | (!dn_dev_islocal(neigh->dev, |
bef55aeb | 1080 | oldflp->saddr)))) { |
1da177e4 LT |
1081 | neigh_release(neigh); |
1082 | neigh = NULL; | |
1083 | } else { | |
1084 | if (dev_out) | |
1085 | dev_put(dev_out); | |
bef55aeb | 1086 | if (dn_dev_islocal(neigh->dev, fld.daddr)) { |
2774c7ab | 1087 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1088 | res.type = RTN_LOCAL; |
1089 | } else { | |
1090 | dev_out = neigh->dev; | |
1091 | } | |
1092 | dev_hold(dev_out); | |
1093 | goto select_source; | |
1094 | } | |
1095 | } | |
1096 | } | |
1097 | ||
1098 | /* Not there? Perhaps its a local address */ | |
1099 | if (dev_out == NULL) | |
1100 | dev_out = dn_dev_get_default(); | |
1101 | err = -ENODEV; | |
1102 | if (dev_out == NULL) | |
1103 | goto out; | |
fc766e4c | 1104 | dn_db = rcu_dereference_raw(dev_out->dn_ptr); |
1da177e4 | 1105 | /* Possible improvement - check all devices for local addr */ |
bef55aeb | 1106 | if (dn_dev_islocal(dev_out, fld.daddr)) { |
1da177e4 | 1107 | dev_put(dev_out); |
2774c7ab | 1108 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1109 | dev_hold(dev_out); |
1110 | res.type = RTN_LOCAL; | |
1111 | goto select_source; | |
1112 | } | |
1113 | /* Not local either.... try sending it to the default router */ | |
1114 | neigh = neigh_clone(dn_db->router); | |
1115 | BUG_ON(neigh && neigh->dev != dev_out); | |
1116 | ||
1117 | /* Ok then, we assume its directly connected and move on */ | |
1118 | select_source: | |
1119 | if (neigh) | |
1120 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1121 | if (gateway == 0) | |
bef55aeb DM |
1122 | gateway = fld.daddr; |
1123 | if (fld.saddr == 0) { | |
1124 | fld.saddr = dnet_select_source(dev_out, gateway, | |
1125 | res.type == RTN_LOCAL ? | |
1126 | RT_SCOPE_HOST : | |
1127 | RT_SCOPE_LINK); | |
1128 | if (fld.saddr == 0 && res.type != RTN_LOCAL) | |
1da177e4 LT |
1129 | goto e_addr; |
1130 | } | |
bef55aeb | 1131 | fld.flowidn_oif = dev_out->ifindex; |
1da177e4 LT |
1132 | goto make_route; |
1133 | } | |
1134 | free_res = 1; | |
1135 | ||
1136 | if (res.type == RTN_NAT) | |
1137 | goto e_inval; | |
1138 | ||
1139 | if (res.type == RTN_LOCAL) { | |
bef55aeb DM |
1140 | if (!fld.saddr) |
1141 | fld.saddr = fld.daddr; | |
1da177e4 LT |
1142 | if (dev_out) |
1143 | dev_put(dev_out); | |
2774c7ab | 1144 | dev_out = init_net.loopback_dev; |
1da177e4 | 1145 | dev_hold(dev_out); |
bef55aeb | 1146 | fld.flowidn_oif = dev_out->ifindex; |
1da177e4 LT |
1147 | if (res.fi) |
1148 | dn_fib_info_put(res.fi); | |
1149 | res.fi = NULL; | |
1150 | goto make_route; | |
1151 | } | |
1152 | ||
bef55aeb DM |
1153 | if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0) |
1154 | dn_fib_select_multipath(&fld, &res); | |
1da177e4 | 1155 | |
429eb0fa | 1156 | /* |
1da177e4 LT |
1157 | * We could add some logic to deal with default routes here and |
1158 | * get rid of some of the special casing above. | |
1159 | */ | |
1160 | ||
bef55aeb DM |
1161 | if (!fld.saddr) |
1162 | fld.saddr = DN_FIB_RES_PREFSRC(res); | |
429eb0fa | 1163 | |
1da177e4 LT |
1164 | if (dev_out) |
1165 | dev_put(dev_out); | |
1166 | dev_out = DN_FIB_RES_DEV(res); | |
1167 | dev_hold(dev_out); | |
bef55aeb | 1168 | fld.flowidn_oif = dev_out->ifindex; |
1da177e4 LT |
1169 | gateway = DN_FIB_RES_GW(res); |
1170 | ||
1171 | make_route: | |
1172 | if (dev_out->flags & IFF_LOOPBACK) | |
1173 | flags |= RTCF_LOCAL; | |
1174 | ||
5c1e6aa3 | 1175 | rt = dst_alloc(&dn_dst_ops, dev_out, 1, 0, DST_HOST); |
1da177e4 LT |
1176 | if (rt == NULL) |
1177 | goto e_nobufs; | |
1178 | ||
cf911662 | 1179 | memset(&rt->fld, 0, sizeof(rt->fld)); |
bef55aeb DM |
1180 | rt->fld.saddr = oldflp->saddr; |
1181 | rt->fld.daddr = oldflp->daddr; | |
1182 | rt->fld.flowidn_oif = oldflp->flowidn_oif; | |
1183 | rt->fld.flowidn_iif = 0; | |
1184 | rt->fld.flowidn_mark = oldflp->flowidn_mark; | |
1da177e4 | 1185 | |
bef55aeb DM |
1186 | rt->rt_saddr = fld.saddr; |
1187 | rt->rt_daddr = fld.daddr; | |
1188 | rt->rt_gateway = gateway ? gateway : fld.daddr; | |
1189 | rt->rt_local_src = fld.saddr; | |
1da177e4 | 1190 | |
bef55aeb DM |
1191 | rt->rt_dst_map = fld.daddr; |
1192 | rt->rt_src_map = fld.saddr; | |
1da177e4 | 1193 | |
fccd7d5c | 1194 | rt->n = neigh; |
1da177e4 LT |
1195 | neigh = NULL; |
1196 | ||
d8d1f30b CG |
1197 | rt->dst.lastuse = jiffies; |
1198 | rt->dst.output = dn_output; | |
1199 | rt->dst.input = dn_rt_bug; | |
1da177e4 LT |
1200 | rt->rt_flags = flags; |
1201 | if (flags & RTCF_LOCAL) | |
d8d1f30b | 1202 | rt->dst.input = dn_nsp_rx; |
1da177e4 LT |
1203 | |
1204 | err = dn_rt_set_next_hop(rt, &res); | |
1205 | if (err) | |
1206 | goto e_neighbour; | |
1207 | ||
bef55aeb | 1208 | hash = dn_hash(rt->fld.saddr, rt->fld.daddr); |
1da177e4 LT |
1209 | dn_insert_route(rt, hash, (struct dn_route **)pprt); |
1210 | ||
1211 | done: | |
1212 | if (neigh) | |
1213 | neigh_release(neigh); | |
1214 | if (free_res) | |
1215 | dn_fib_res_put(&res); | |
1216 | if (dev_out) | |
1217 | dev_put(dev_out); | |
1218 | out: | |
1219 | return err; | |
1220 | ||
1221 | e_addr: | |
429eb0fa YH |
1222 | err = -EADDRNOTAVAIL; |
1223 | goto done; | |
1da177e4 LT |
1224 | e_inval: |
1225 | err = -EINVAL; | |
1226 | goto done; | |
1227 | e_nobufs: | |
1228 | err = -ENOBUFS; | |
1229 | goto done; | |
1230 | e_neighbour: | |
d8d1f30b | 1231 | dst_free(&rt->dst); |
1da177e4 LT |
1232 | goto e_nobufs; |
1233 | } | |
1234 | ||
1235 | ||
1236 | /* | |
1237 | * N.B. The flags may be moved into the flowi at some future stage. | |
1238 | */ | |
bef55aeb | 1239 | static int __dn_route_output_key(struct dst_entry **pprt, const struct flowidn *flp, int flags) |
1da177e4 | 1240 | { |
95c96174 | 1241 | unsigned int hash = dn_hash(flp->saddr, flp->daddr); |
1da177e4 LT |
1242 | struct dn_route *rt = NULL; |
1243 | ||
1244 | if (!(flags & MSG_TRYHARD)) { | |
1245 | rcu_read_lock_bh(); | |
a898def2 | 1246 | for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt; |
d8d1f30b | 1247 | rt = rcu_dereference_bh(rt->dst.dn_next)) { |
bef55aeb DM |
1248 | if ((flp->daddr == rt->fld.daddr) && |
1249 | (flp->saddr == rt->fld.saddr) && | |
1250 | (flp->flowidn_mark == rt->fld.flowidn_mark) && | |
c7537967 | 1251 | dn_is_output_route(rt) && |
bef55aeb | 1252 | (rt->fld.flowidn_oif == flp->flowidn_oif)) { |
d8d1f30b | 1253 | dst_use(&rt->dst, jiffies); |
1da177e4 | 1254 | rcu_read_unlock_bh(); |
d8d1f30b | 1255 | *pprt = &rt->dst; |
1da177e4 LT |
1256 | return 0; |
1257 | } | |
1258 | } | |
1259 | rcu_read_unlock_bh(); | |
1260 | } | |
1261 | ||
1262 | return dn_route_output_slow(pprt, flp, flags); | |
1263 | } | |
1264 | ||
bef55aeb | 1265 | static int dn_route_output_key(struct dst_entry **pprt, struct flowidn *flp, int flags) |
1da177e4 LT |
1266 | { |
1267 | int err; | |
1268 | ||
1269 | err = __dn_route_output_key(pprt, flp, flags); | |
bef55aeb DM |
1270 | if (err == 0 && flp->flowidn_proto) { |
1271 | *pprt = xfrm_lookup(&init_net, *pprt, | |
1272 | flowidn_to_flowi(flp), NULL, 0); | |
452edd59 DM |
1273 | if (IS_ERR(*pprt)) { |
1274 | err = PTR_ERR(*pprt); | |
1275 | *pprt = NULL; | |
1276 | } | |
1da177e4 LT |
1277 | } |
1278 | return err; | |
1279 | } | |
1280 | ||
bef55aeb | 1281 | int dn_route_output_sock(struct dst_entry **pprt, struct flowidn *fl, struct sock *sk, int flags) |
1da177e4 LT |
1282 | { |
1283 | int err; | |
1284 | ||
1285 | err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD); | |
bef55aeb | 1286 | if (err == 0 && fl->flowidn_proto) { |
80c0bc9e | 1287 | if (!(flags & MSG_DONTWAIT)) |
bef55aeb DM |
1288 | fl->flowidn_flags |= FLOWI_FLAG_CAN_SLEEP; |
1289 | *pprt = xfrm_lookup(&init_net, *pprt, | |
1290 | flowidn_to_flowi(fl), sk, 0); | |
452edd59 DM |
1291 | if (IS_ERR(*pprt)) { |
1292 | err = PTR_ERR(*pprt); | |
1293 | *pprt = NULL; | |
1294 | } | |
1da177e4 LT |
1295 | } |
1296 | return err; | |
1297 | } | |
1298 | ||
1299 | static int dn_route_input_slow(struct sk_buff *skb) | |
1300 | { | |
1301 | struct dn_route *rt = NULL; | |
1302 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1303 | struct net_device *in_dev = skb->dev; | |
1304 | struct net_device *out_dev = NULL; | |
1305 | struct dn_dev *dn_db; | |
1306 | struct neighbour *neigh = NULL; | |
95c96174 | 1307 | unsigned int hash; |
1da177e4 | 1308 | int flags = 0; |
c4ea94ab SW |
1309 | __le16 gateway = 0; |
1310 | __le16 local_src = 0; | |
bef55aeb DM |
1311 | struct flowidn fld = { |
1312 | .daddr = cb->dst, | |
1313 | .saddr = cb->src, | |
1314 | .flowidn_scope = RT_SCOPE_UNIVERSE, | |
1315 | .flowidn_mark = skb->mark, | |
1316 | .flowidn_iif = skb->dev->ifindex, | |
1d28f42c | 1317 | }; |
1da177e4 LT |
1318 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE }; |
1319 | int err = -EINVAL; | |
1320 | int free_res = 0; | |
1321 | ||
1322 | dev_hold(in_dev); | |
1323 | ||
fc766e4c | 1324 | if ((dn_db = rcu_dereference(in_dev->dn_ptr)) == NULL) |
1da177e4 LT |
1325 | goto out; |
1326 | ||
1327 | /* Zero source addresses are not allowed */ | |
bef55aeb | 1328 | if (fld.saddr == 0) |
1da177e4 LT |
1329 | goto out; |
1330 | ||
1331 | /* | |
1332 | * In this case we've just received a packet from a source | |
1333 | * outside ourselves pretending to come from us. We don't | |
1334 | * allow it any further to prevent routing loops, spoofing and | |
1335 | * other nasties. Loopback packets already have the dst attached | |
1336 | * so this only affects packets which have originated elsewhere. | |
1337 | */ | |
1338 | err = -ENOTUNIQ; | |
1339 | if (dn_dev_islocal(in_dev, cb->src)) | |
1340 | goto out; | |
1341 | ||
bef55aeb | 1342 | err = dn_fib_lookup(&fld, &res); |
1da177e4 LT |
1343 | if (err) { |
1344 | if (err != -ESRCH) | |
1345 | goto out; | |
1346 | /* | |
1347 | * Is the destination us ? | |
1348 | */ | |
1349 | if (!dn_dev_islocal(in_dev, cb->dst)) | |
1350 | goto e_inval; | |
1351 | ||
1352 | res.type = RTN_LOCAL; | |
1da177e4 | 1353 | } else { |
bef55aeb | 1354 | __le16 src_map = fld.saddr; |
1da177e4 LT |
1355 | free_res = 1; |
1356 | ||
1357 | out_dev = DN_FIB_RES_DEV(res); | |
1358 | if (out_dev == NULL) { | |
e87cc472 | 1359 | net_crit_ratelimited("Bug in dn_route_input_slow() No output device\n"); |
1da177e4 LT |
1360 | goto e_inval; |
1361 | } | |
1362 | dev_hold(out_dev); | |
1363 | ||
1364 | if (res.r) | |
bef55aeb | 1365 | src_map = fld.saddr; /* no NAT support for now */ |
1da177e4 LT |
1366 | |
1367 | gateway = DN_FIB_RES_GW(res); | |
1368 | if (res.type == RTN_NAT) { | |
bef55aeb | 1369 | fld.daddr = dn_fib_rules_map_destination(fld.daddr, &res); |
1da177e4 LT |
1370 | dn_fib_res_put(&res); |
1371 | free_res = 0; | |
bef55aeb | 1372 | if (dn_fib_lookup(&fld, &res)) |
1da177e4 LT |
1373 | goto e_inval; |
1374 | free_res = 1; | |
1375 | if (res.type != RTN_UNICAST) | |
1376 | goto e_inval; | |
1377 | flags |= RTCF_DNAT; | |
bef55aeb | 1378 | gateway = fld.daddr; |
1da177e4 | 1379 | } |
bef55aeb | 1380 | fld.saddr = src_map; |
1da177e4 LT |
1381 | } |
1382 | ||
1383 | switch(res.type) { | |
1384 | case RTN_UNICAST: | |
1385 | /* | |
1386 | * Forwarding check here, we only check for forwarding | |
1387 | * being turned off, if you want to only forward intra | |
1388 | * area, its up to you to set the routing tables up | |
1389 | * correctly. | |
1390 | */ | |
1391 | if (dn_db->parms.forwarding == 0) | |
1392 | goto e_inval; | |
1393 | ||
bef55aeb DM |
1394 | if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0) |
1395 | dn_fib_select_multipath(&fld, &res); | |
1da177e4 | 1396 | |
429eb0fa | 1397 | /* |
1da177e4 LT |
1398 | * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT |
1399 | * flag as a hint to set the intra-ethernet bit when | |
1400 | * forwarding. If we've got NAT in operation, we don't do | |
1401 | * this optimisation. | |
1402 | */ | |
1403 | if (out_dev == in_dev && !(flags & RTCF_NAT)) | |
1404 | flags |= RTCF_DOREDIRECT; | |
1405 | ||
1406 | local_src = DN_FIB_RES_PREFSRC(res); | |
1407 | ||
1408 | case RTN_BLACKHOLE: | |
1409 | case RTN_UNREACHABLE: | |
1410 | break; | |
1411 | case RTN_LOCAL: | |
1412 | flags |= RTCF_LOCAL; | |
bef55aeb DM |
1413 | fld.saddr = cb->dst; |
1414 | fld.daddr = cb->src; | |
1da177e4 LT |
1415 | |
1416 | /* Routing tables gave us a gateway */ | |
1417 | if (gateway) | |
1418 | goto make_route; | |
1419 | ||
1420 | /* Packet was intra-ethernet, so we know its on-link */ | |
3a31b9d2 | 1421 | if (cb->rt_flags & DN_RT_F_IE) { |
1da177e4 LT |
1422 | gateway = cb->src; |
1423 | flags |= RTCF_DIRECTSRC; | |
1424 | goto make_route; | |
1425 | } | |
1426 | ||
1427 | /* Use the default router if there is one */ | |
1428 | neigh = neigh_clone(dn_db->router); | |
1429 | if (neigh) { | |
1430 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1431 | goto make_route; | |
1432 | } | |
1433 | ||
1434 | /* Close eyes and pray */ | |
1435 | gateway = cb->src; | |
1436 | flags |= RTCF_DIRECTSRC; | |
1437 | goto make_route; | |
1438 | default: | |
1439 | goto e_inval; | |
1440 | } | |
1441 | ||
1442 | make_route: | |
5c1e6aa3 | 1443 | rt = dst_alloc(&dn_dst_ops, out_dev, 0, 0, DST_HOST); |
1da177e4 LT |
1444 | if (rt == NULL) |
1445 | goto e_nobufs; | |
1446 | ||
cf911662 | 1447 | memset(&rt->fld, 0, sizeof(rt->fld)); |
bef55aeb DM |
1448 | rt->rt_saddr = fld.saddr; |
1449 | rt->rt_daddr = fld.daddr; | |
1450 | rt->rt_gateway = fld.daddr; | |
1da177e4 LT |
1451 | if (gateway) |
1452 | rt->rt_gateway = gateway; | |
1453 | rt->rt_local_src = local_src ? local_src : rt->rt_saddr; | |
1454 | ||
bef55aeb DM |
1455 | rt->rt_dst_map = fld.daddr; |
1456 | rt->rt_src_map = fld.saddr; | |
1da177e4 | 1457 | |
bef55aeb DM |
1458 | rt->fld.saddr = cb->src; |
1459 | rt->fld.daddr = cb->dst; | |
1460 | rt->fld.flowidn_oif = 0; | |
1461 | rt->fld.flowidn_iif = in_dev->ifindex; | |
1462 | rt->fld.flowidn_mark = fld.flowidn_mark; | |
1da177e4 | 1463 | |
fccd7d5c | 1464 | rt->n = neigh; |
d8d1f30b CG |
1465 | rt->dst.lastuse = jiffies; |
1466 | rt->dst.output = dn_rt_bug; | |
06f8fe11 JP |
1467 | switch (res.type) { |
1468 | case RTN_UNICAST: | |
1469 | rt->dst.input = dn_forward; | |
1470 | break; | |
1471 | case RTN_LOCAL: | |
1472 | rt->dst.output = dn_output; | |
1473 | rt->dst.input = dn_nsp_rx; | |
1474 | rt->dst.dev = in_dev; | |
1475 | flags |= RTCF_LOCAL; | |
1476 | break; | |
1477 | default: | |
1478 | case RTN_UNREACHABLE: | |
1479 | case RTN_BLACKHOLE: | |
1480 | rt->dst.input = dst_discard; | |
1da177e4 LT |
1481 | } |
1482 | rt->rt_flags = flags; | |
1da177e4 LT |
1483 | |
1484 | err = dn_rt_set_next_hop(rt, &res); | |
1485 | if (err) | |
1486 | goto e_neighbour; | |
1487 | ||
bef55aeb | 1488 | hash = dn_hash(rt->fld.saddr, rt->fld.daddr); |
adf30907 | 1489 | dn_insert_route(rt, hash, &rt); |
d8d1f30b | 1490 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
1491 | |
1492 | done: | |
1493 | if (neigh) | |
1494 | neigh_release(neigh); | |
1495 | if (free_res) | |
1496 | dn_fib_res_put(&res); | |
1497 | dev_put(in_dev); | |
1498 | if (out_dev) | |
1499 | dev_put(out_dev); | |
1500 | out: | |
1501 | return err; | |
1502 | ||
1503 | e_inval: | |
1504 | err = -EINVAL; | |
1505 | goto done; | |
1506 | ||
1507 | e_nobufs: | |
1508 | err = -ENOBUFS; | |
1509 | goto done; | |
1510 | ||
1511 | e_neighbour: | |
d8d1f30b | 1512 | dst_free(&rt->dst); |
1da177e4 LT |
1513 | goto done; |
1514 | } | |
1515 | ||
5eaa65b2 | 1516 | static int dn_route_input(struct sk_buff *skb) |
1da177e4 LT |
1517 | { |
1518 | struct dn_route *rt; | |
1519 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
95c96174 | 1520 | unsigned int hash = dn_hash(cb->src, cb->dst); |
1da177e4 | 1521 | |
adf30907 | 1522 | if (skb_dst(skb)) |
1da177e4 LT |
1523 | return 0; |
1524 | ||
1525 | rcu_read_lock(); | |
1526 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL; | |
d8d1f30b | 1527 | rt = rcu_dereference(rt->dst.dn_next)) { |
bef55aeb DM |
1528 | if ((rt->fld.saddr == cb->src) && |
1529 | (rt->fld.daddr == cb->dst) && | |
1530 | (rt->fld.flowidn_oif == 0) && | |
1531 | (rt->fld.flowidn_mark == skb->mark) && | |
1532 | (rt->fld.flowidn_iif == cb->iif)) { | |
d8d1f30b | 1533 | dst_use(&rt->dst, jiffies); |
1da177e4 | 1534 | rcu_read_unlock(); |
adf30907 | 1535 | skb_dst_set(skb, (struct dst_entry *)rt); |
1da177e4 LT |
1536 | return 0; |
1537 | } | |
1538 | } | |
1539 | rcu_read_unlock(); | |
1540 | ||
1541 | return dn_route_input_slow(skb); | |
1542 | } | |
1543 | ||
b6544c0b JHS |
1544 | static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
1545 | int event, int nowait, unsigned int flags) | |
1da177e4 | 1546 | { |
adf30907 | 1547 | struct dn_route *rt = (struct dn_route *)skb_dst(skb); |
1da177e4 LT |
1548 | struct rtmsg *r; |
1549 | struct nlmsghdr *nlh; | |
e3703b3d | 1550 | long expires; |
1da177e4 | 1551 | |
737100e1 DM |
1552 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags); |
1553 | if (!nlh) | |
6b60978f TG |
1554 | return -EMSGSIZE; |
1555 | ||
737100e1 | 1556 | r = nlmsg_data(nlh); |
1da177e4 LT |
1557 | r->rtm_family = AF_DECnet; |
1558 | r->rtm_dst_len = 16; | |
1559 | r->rtm_src_len = 0; | |
1560 | r->rtm_tos = 0; | |
1561 | r->rtm_table = RT_TABLE_MAIN; | |
1562 | r->rtm_type = rt->rt_type; | |
1563 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
1564 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
1565 | r->rtm_protocol = RTPROT_UNSPEC; | |
6b60978f | 1566 | |
1da177e4 LT |
1567 | if (rt->rt_flags & RTCF_NOTIFY) |
1568 | r->rtm_flags |= RTM_F_NOTIFY; | |
6b60978f TG |
1569 | |
1570 | if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN) < 0 || | |
1571 | nla_put_le16(skb, RTA_DST, rt->rt_daddr) < 0) | |
1572 | goto errout; | |
1573 | ||
bef55aeb | 1574 | if (rt->fld.saddr) { |
1da177e4 | 1575 | r->rtm_src_len = 16; |
6b60978f TG |
1576 | if (nla_put_le16(skb, RTA_SRC, rt->fld.saddr) < 0) |
1577 | goto errout; | |
1da177e4 | 1578 | } |
6b60978f TG |
1579 | if (rt->dst.dev && |
1580 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex) < 0) | |
1581 | goto errout; | |
1582 | ||
1da177e4 LT |
1583 | /* |
1584 | * Note to self - change this if input routes reverse direction when | |
1585 | * they deal only with inputs and not with replies like they do | |
1586 | * currently. | |
1587 | */ | |
6b60978f TG |
1588 | if (nla_put_le16(skb, RTA_PREFSRC, rt->rt_local_src) < 0) |
1589 | goto errout; | |
1590 | ||
1591 | if (rt->rt_daddr != rt->rt_gateway && | |
1592 | nla_put_le16(skb, RTA_GATEWAY, rt->rt_gateway) < 0) | |
1593 | goto errout; | |
1594 | ||
defb3519 | 1595 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
6b60978f TG |
1596 | goto errout; |
1597 | ||
d8d1f30b | 1598 | expires = rt->dst.expires ? rt->dst.expires - jiffies : 0; |
87a50699 | 1599 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, |
d8d1f30b | 1600 | rt->dst.error) < 0) |
6b60978f | 1601 | goto errout; |
1da177e4 | 1602 | |
6b60978f TG |
1603 | if (dn_is_input_route(rt) && |
1604 | nla_put_u32(skb, RTA_IIF, rt->fld.flowidn_iif) < 0) | |
1605 | goto errout; | |
1da177e4 | 1606 | |
6b60978f TG |
1607 | return nlmsg_end(skb, nlh); |
1608 | ||
1609 | errout: | |
1610 | nlmsg_cancel(skb, nlh); | |
1611 | return -EMSGSIZE; | |
1da177e4 LT |
1612 | } |
1613 | ||
1614 | /* | |
1615 | * This is called by both endnodes and routers now. | |
1616 | */ | |
fa34ddd7 | 1617 | static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 1618 | { |
3b1e0a65 | 1619 | struct net *net = sock_net(in_skb->sk); |
1da177e4 | 1620 | struct rtattr **rta = arg; |
737100e1 | 1621 | struct rtmsg *rtm = nlmsg_data(nlh); |
1da177e4 LT |
1622 | struct dn_route *rt = NULL; |
1623 | struct dn_skb_cb *cb; | |
1624 | int err; | |
1625 | struct sk_buff *skb; | |
bef55aeb | 1626 | struct flowidn fld; |
1da177e4 | 1627 | |
09ad9bc7 | 1628 | if (!net_eq(net, &init_net)) |
b854272b DL |
1629 | return -EINVAL; |
1630 | ||
bef55aeb DM |
1631 | memset(&fld, 0, sizeof(fld)); |
1632 | fld.flowidn_proto = DNPROTO_NSP; | |
1da177e4 | 1633 | |
6b60978f | 1634 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
1da177e4 LT |
1635 | if (skb == NULL) |
1636 | return -ENOBUFS; | |
459a98ed | 1637 | skb_reset_mac_header(skb); |
1da177e4 LT |
1638 | cb = DN_SKB_CB(skb); |
1639 | ||
1640 | if (rta[RTA_SRC-1]) | |
bef55aeb | 1641 | memcpy(&fld.saddr, RTA_DATA(rta[RTA_SRC-1]), 2); |
1da177e4 | 1642 | if (rta[RTA_DST-1]) |
bef55aeb | 1643 | memcpy(&fld.daddr, RTA_DATA(rta[RTA_DST-1]), 2); |
1da177e4 | 1644 | if (rta[RTA_IIF-1]) |
bef55aeb | 1645 | memcpy(&fld.flowidn_iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); |
1da177e4 | 1646 | |
bef55aeb | 1647 | if (fld.flowidn_iif) { |
1da177e4 | 1648 | struct net_device *dev; |
bef55aeb | 1649 | if ((dev = dev_get_by_index(&init_net, fld.flowidn_iif)) == NULL) { |
1da177e4 LT |
1650 | kfree_skb(skb); |
1651 | return -ENODEV; | |
1652 | } | |
1653 | if (!dev->dn_ptr) { | |
1654 | dev_put(dev); | |
1655 | kfree_skb(skb); | |
1656 | return -ENODEV; | |
1657 | } | |
b98999dc | 1658 | skb->protocol = htons(ETH_P_DNA_RT); |
1da177e4 | 1659 | skb->dev = dev; |
bef55aeb DM |
1660 | cb->src = fld.saddr; |
1661 | cb->dst = fld.daddr; | |
1da177e4 LT |
1662 | local_bh_disable(); |
1663 | err = dn_route_input(skb); | |
1664 | local_bh_enable(); | |
1665 | memset(cb, 0, sizeof(struct dn_skb_cb)); | |
adf30907 | 1666 | rt = (struct dn_route *)skb_dst(skb); |
d8d1f30b CG |
1667 | if (!err && -rt->dst.error) |
1668 | err = rt->dst.error; | |
1da177e4 LT |
1669 | } else { |
1670 | int oif = 0; | |
1671 | if (rta[RTA_OIF - 1]) | |
1672 | memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int)); | |
bef55aeb DM |
1673 | fld.flowidn_oif = oif; |
1674 | err = dn_route_output_key((struct dst_entry **)&rt, &fld, 0); | |
1da177e4 LT |
1675 | } |
1676 | ||
1677 | if (skb->dev) | |
1678 | dev_put(skb->dev); | |
1679 | skb->dev = NULL; | |
1680 | if (err) | |
1681 | goto out_free; | |
d8d1f30b | 1682 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
1683 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
1684 | rt->rt_flags |= RTCF_NOTIFY; | |
1685 | ||
b6544c0b | 1686 | err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0); |
1da177e4 LT |
1687 | |
1688 | if (err == 0) | |
1689 | goto out_free; | |
1690 | if (err < 0) { | |
1691 | err = -EMSGSIZE; | |
1692 | goto out_free; | |
1693 | } | |
1694 | ||
97c53cac | 1695 | return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
1da177e4 LT |
1696 | |
1697 | out_free: | |
1698 | kfree_skb(skb); | |
1699 | return err; | |
1700 | } | |
1701 | ||
1702 | /* | |
1703 | * For routers, this is called from dn_fib_dump, but for endnodes its | |
1704 | * called directly from the rtnetlink dispatch table. | |
1705 | */ | |
1706 | int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1707 | { | |
3b1e0a65 | 1708 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1709 | struct dn_route *rt; |
1710 | int h, s_h; | |
1711 | int idx, s_idx; | |
6b60978f | 1712 | struct rtmsg *rtm; |
1da177e4 | 1713 | |
09ad9bc7 | 1714 | if (!net_eq(net, &init_net)) |
b854272b DL |
1715 | return 0; |
1716 | ||
6b60978f | 1717 | if (nlmsg_len(cb->nlh) < sizeof(struct rtmsg)) |
1da177e4 | 1718 | return -EINVAL; |
6b60978f TG |
1719 | |
1720 | rtm = nlmsg_data(cb->nlh); | |
1721 | if (!(rtm->rtm_flags & RTM_F_CLONED)) | |
1da177e4 LT |
1722 | return 0; |
1723 | ||
1724 | s_h = cb->args[0]; | |
1725 | s_idx = idx = cb->args[1]; | |
1726 | for(h = 0; h <= dn_rt_hash_mask; h++) { | |
1727 | if (h < s_h) | |
1728 | continue; | |
1729 | if (h > s_h) | |
1730 | s_idx = 0; | |
1731 | rcu_read_lock_bh(); | |
a898def2 | 1732 | for(rt = rcu_dereference_bh(dn_rt_hash_table[h].chain), idx = 0; |
1da177e4 | 1733 | rt; |
d8d1f30b | 1734 | rt = rcu_dereference_bh(rt->dst.dn_next), idx++) { |
1da177e4 LT |
1735 | if (idx < s_idx) |
1736 | continue; | |
d8d1f30b | 1737 | skb_dst_set(skb, dst_clone(&rt->dst)); |
1da177e4 | 1738 | if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid, |
429eb0fa | 1739 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 1740 | 1, NLM_F_MULTI) <= 0) { |
adf30907 | 1741 | skb_dst_drop(skb); |
1da177e4 LT |
1742 | rcu_read_unlock_bh(); |
1743 | goto done; | |
1744 | } | |
adf30907 | 1745 | skb_dst_drop(skb); |
1da177e4 LT |
1746 | } |
1747 | rcu_read_unlock_bh(); | |
1748 | } | |
1749 | ||
1750 | done: | |
1751 | cb->args[0] = h; | |
1752 | cb->args[1] = idx; | |
1753 | return skb->len; | |
1754 | } | |
1755 | ||
1756 | #ifdef CONFIG_PROC_FS | |
1757 | struct dn_rt_cache_iter_state { | |
1758 | int bucket; | |
1759 | }; | |
1760 | ||
1761 | static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq) | |
1762 | { | |
1763 | struct dn_route *rt = NULL; | |
1764 | struct dn_rt_cache_iter_state *s = seq->private; | |
1765 | ||
1766 | for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) { | |
1767 | rcu_read_lock_bh(); | |
a898def2 | 1768 | rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); |
1da177e4 LT |
1769 | if (rt) |
1770 | break; | |
1771 | rcu_read_unlock_bh(); | |
1772 | } | |
a898def2 | 1773 | return rt; |
1da177e4 LT |
1774 | } |
1775 | ||
1776 | static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt) | |
1777 | { | |
0d89d794 | 1778 | struct dn_rt_cache_iter_state *s = seq->private; |
1da177e4 | 1779 | |
fc766e4c ED |
1780 | rt = rcu_dereference_bh(rt->dst.dn_next); |
1781 | while (!rt) { | |
1da177e4 LT |
1782 | rcu_read_unlock_bh(); |
1783 | if (--s->bucket < 0) | |
1784 | break; | |
1785 | rcu_read_lock_bh(); | |
fc766e4c | 1786 | rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); |
1da177e4 | 1787 | } |
fc766e4c | 1788 | return rt; |
1da177e4 LT |
1789 | } |
1790 | ||
1791 | static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
1792 | { | |
1793 | struct dn_route *rt = dn_rt_cache_get_first(seq); | |
1794 | ||
1795 | if (rt) { | |
1796 | while(*pos && (rt = dn_rt_cache_get_next(seq, rt))) | |
1797 | --*pos; | |
1798 | } | |
1799 | return *pos ? NULL : rt; | |
1800 | } | |
1801 | ||
1802 | static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1803 | { | |
1804 | struct dn_route *rt = dn_rt_cache_get_next(seq, v); | |
1805 | ++*pos; | |
1806 | return rt; | |
1807 | } | |
1808 | ||
1809 | static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v) | |
1810 | { | |
1811 | if (v) | |
1812 | rcu_read_unlock_bh(); | |
1813 | } | |
1814 | ||
1815 | static int dn_rt_cache_seq_show(struct seq_file *seq, void *v) | |
1816 | { | |
1817 | struct dn_route *rt = v; | |
1818 | char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN]; | |
1819 | ||
1820 | seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n", | |
794785bf DM |
1821 | rt->dst.dev ? rt->dst.dev->name : "*", |
1822 | dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1), | |
1823 | dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2), | |
1824 | atomic_read(&rt->dst.__refcnt), | |
1825 | rt->dst.__use, 0); | |
1da177e4 | 1826 | return 0; |
429eb0fa | 1827 | } |
1da177e4 | 1828 | |
56b3d975 | 1829 | static const struct seq_operations dn_rt_cache_seq_ops = { |
1da177e4 LT |
1830 | .start = dn_rt_cache_seq_start, |
1831 | .next = dn_rt_cache_seq_next, | |
1832 | .stop = dn_rt_cache_seq_stop, | |
1833 | .show = dn_rt_cache_seq_show, | |
1834 | }; | |
1835 | ||
1836 | static int dn_rt_cache_seq_open(struct inode *inode, struct file *file) | |
1837 | { | |
31164088 PE |
1838 | return seq_open_private(file, &dn_rt_cache_seq_ops, |
1839 | sizeof(struct dn_rt_cache_iter_state)); | |
1da177e4 LT |
1840 | } |
1841 | ||
9a32144e | 1842 | static const struct file_operations dn_rt_cache_seq_fops = { |
1da177e4 LT |
1843 | .owner = THIS_MODULE, |
1844 | .open = dn_rt_cache_seq_open, | |
1845 | .read = seq_read, | |
1846 | .llseek = seq_lseek, | |
1847 | .release = seq_release_private, | |
1848 | }; | |
1849 | ||
1850 | #endif /* CONFIG_PROC_FS */ | |
1851 | ||
1852 | void __init dn_route_init(void) | |
1853 | { | |
1854 | int i, goal, order; | |
1855 | ||
e5d679f3 AD |
1856 | dn_dst_ops.kmem_cachep = |
1857 | kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0, | |
20c2df83 | 1858 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
fc66f95c | 1859 | dst_entries_init(&dn_dst_ops); |
b24b8a24 | 1860 | setup_timer(&dn_route_timer, dn_dst_check_expire, 0); |
1da177e4 LT |
1861 | dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; |
1862 | add_timer(&dn_route_timer); | |
1863 | ||
4481374c | 1864 | goal = totalram_pages >> (26 - PAGE_SHIFT); |
1da177e4 LT |
1865 | |
1866 | for(order = 0; (1UL << order) < goal; order++) | |
1867 | /* NOTHING */; | |
1868 | ||
429eb0fa YH |
1869 | /* |
1870 | * Only want 1024 entries max, since the table is very, very unlikely | |
1871 | * to be larger than that. | |
1872 | */ | |
1873 | while(order && ((((1UL << order) * PAGE_SIZE) / | |
1874 | sizeof(struct dn_rt_hash_bucket)) >= 2048)) | |
1875 | order--; | |
1876 | ||
1877 | do { | |
1878 | dn_rt_hash_mask = (1UL << order) * PAGE_SIZE / | |
1879 | sizeof(struct dn_rt_hash_bucket); | |
1880 | while(dn_rt_hash_mask & (dn_rt_hash_mask - 1)) | |
1881 | dn_rt_hash_mask--; | |
1882 | dn_rt_hash_table = (struct dn_rt_hash_bucket *) | |
1883 | __get_free_pages(GFP_ATOMIC, order); | |
1884 | } while (dn_rt_hash_table == NULL && --order > 0); | |
1da177e4 LT |
1885 | |
1886 | if (!dn_rt_hash_table) | |
429eb0fa | 1887 | panic("Failed to allocate DECnet route cache hash table\n"); |
1da177e4 | 1888 | |
429eb0fa YH |
1889 | printk(KERN_INFO |
1890 | "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n", | |
1891 | dn_rt_hash_mask, | |
1da177e4 LT |
1892 | (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024); |
1893 | ||
1894 | dn_rt_hash_mask--; | |
429eb0fa YH |
1895 | for(i = 0; i <= dn_rt_hash_mask; i++) { |
1896 | spin_lock_init(&dn_rt_hash_table[i].lock); | |
1897 | dn_rt_hash_table[i].chain = NULL; | |
1898 | } | |
1da177e4 | 1899 | |
429eb0fa | 1900 | dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1); |
1da177e4 | 1901 | |
457c4cbc | 1902 | proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops); |
fa34ddd7 TG |
1903 | |
1904 | #ifdef CONFIG_DECNET_ROUTER | |
c7ac8679 GR |
1905 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, |
1906 | dn_fib_dump, NULL); | |
fa34ddd7 TG |
1907 | #else |
1908 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, | |
c7ac8679 | 1909 | dn_cache_dump, NULL); |
fa34ddd7 | 1910 | #endif |
1da177e4 LT |
1911 | } |
1912 | ||
1913 | void __exit dn_route_cleanup(void) | |
1914 | { | |
1915 | del_timer(&dn_route_timer); | |
1916 | dn_run_flush(0); | |
1917 | ||
457c4cbc | 1918 | proc_net_remove(&init_net, "decnet_cache"); |
fc66f95c | 1919 | dst_entries_destroy(&dn_dst_ops); |
1da177e4 LT |
1920 | } |
1921 |