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); |
1da177e4 LT |
115 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *); |
116 | static void dn_dst_link_failure(struct sk_buff *); | |
117 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu); | |
118 | static int dn_route_input(struct sk_buff *); | |
119 | static void dn_run_flush(unsigned long dummy); | |
120 | ||
121 | static struct dn_rt_hash_bucket *dn_rt_hash_table; | |
122 | static unsigned dn_rt_hash_mask; | |
123 | ||
124 | static struct timer_list dn_route_timer; | |
8d06afab | 125 | static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0); |
1da177e4 LT |
126 | int decnet_dst_gc_interval = 2; |
127 | ||
128 | static struct dst_ops dn_dst_ops = { | |
129 | .family = PF_DECnet, | |
09640e63 | 130 | .protocol = cpu_to_be16(ETH_P_DNA_RT), |
1da177e4 LT |
131 | .gc_thresh = 128, |
132 | .gc = dn_dst_gc, | |
133 | .check = dn_dst_check, | |
0dbaee3b | 134 | .default_advmss = dn_dst_default_advmss, |
d33e4553 | 135 | .default_mtu = dn_dst_default_mtu, |
1da177e4 LT |
136 | .negative_advice = dn_dst_negative_advice, |
137 | .link_failure = dn_dst_link_failure, | |
138 | .update_pmtu = dn_dst_update_pmtu, | |
1da177e4 LT |
139 | }; |
140 | ||
c4ea94ab | 141 | static __inline__ unsigned dn_hash(__le16 src, __le16 dst) |
1da177e4 | 142 | { |
c4ea94ab | 143 | __u16 tmp = (__u16 __force)(src ^ dst); |
1da177e4 LT |
144 | tmp ^= (tmp >> 3); |
145 | tmp ^= (tmp >> 5); | |
146 | tmp ^= (tmp >> 10); | |
147 | return dn_rt_hash_mask & (unsigned)tmp; | |
148 | } | |
149 | ||
150 | static inline void dnrt_free(struct dn_route *rt) | |
151 | { | |
d8d1f30b | 152 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); |
1da177e4 LT |
153 | } |
154 | ||
155 | static inline void dnrt_drop(struct dn_route *rt) | |
156 | { | |
d8d1f30b CG |
157 | dst_release(&rt->dst); |
158 | call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free); | |
1da177e4 LT |
159 | } |
160 | ||
161 | static void dn_dst_check_expire(unsigned long dummy) | |
162 | { | |
163 | int i; | |
fc766e4c ED |
164 | struct dn_route *rt; |
165 | struct dn_route __rcu **rtp; | |
1da177e4 LT |
166 | unsigned long now = jiffies; |
167 | unsigned long expire = 120 * HZ; | |
168 | ||
fc766e4c | 169 | for (i = 0; i <= dn_rt_hash_mask; i++) { |
1da177e4 LT |
170 | rtp = &dn_rt_hash_table[i].chain; |
171 | ||
172 | spin_lock(&dn_rt_hash_table[i].lock); | |
fc766e4c ED |
173 | while ((rt = rcu_dereference_protected(*rtp, |
174 | lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) { | |
d8d1f30b CG |
175 | if (atomic_read(&rt->dst.__refcnt) || |
176 | (now - rt->dst.lastuse) < expire) { | |
177 | rtp = &rt->dst.dn_next; | |
1da177e4 LT |
178 | continue; |
179 | } | |
d8d1f30b CG |
180 | *rtp = rt->dst.dn_next; |
181 | rt->dst.dn_next = NULL; | |
1da177e4 LT |
182 | dnrt_free(rt); |
183 | } | |
184 | spin_unlock(&dn_rt_hash_table[i].lock); | |
185 | ||
186 | if ((jiffies - now) > 0) | |
187 | break; | |
188 | } | |
189 | ||
190 | mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ); | |
191 | } | |
192 | ||
569d3645 | 193 | static int dn_dst_gc(struct dst_ops *ops) |
1da177e4 | 194 | { |
fc766e4c ED |
195 | struct dn_route *rt; |
196 | struct dn_route __rcu **rtp; | |
1da177e4 LT |
197 | int i; |
198 | unsigned long now = jiffies; | |
199 | unsigned long expire = 10 * HZ; | |
200 | ||
fc766e4c | 201 | for (i = 0; i <= dn_rt_hash_mask; i++) { |
1da177e4 LT |
202 | |
203 | spin_lock_bh(&dn_rt_hash_table[i].lock); | |
204 | rtp = &dn_rt_hash_table[i].chain; | |
205 | ||
fc766e4c ED |
206 | while ((rt = rcu_dereference_protected(*rtp, |
207 | lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) { | |
d8d1f30b CG |
208 | if (atomic_read(&rt->dst.__refcnt) || |
209 | (now - rt->dst.lastuse) < expire) { | |
210 | rtp = &rt->dst.dn_next; | |
1da177e4 LT |
211 | continue; |
212 | } | |
d8d1f30b CG |
213 | *rtp = rt->dst.dn_next; |
214 | rt->dst.dn_next = NULL; | |
1da177e4 LT |
215 | dnrt_drop(rt); |
216 | break; | |
217 | } | |
218 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
219 | } | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | /* | |
225 | * The decnet standards don't impose a particular minimum mtu, what they | |
226 | * do insist on is that the routing layer accepts a datagram of at least | |
227 | * 230 bytes long. Here we have to subtract the routing header length from | |
228 | * 230 to get the minimum acceptable mtu. If there is no neighbour, then we | |
229 | * assume the worst and use a long header size. | |
230 | * | |
231 | * We update both the mtu and the advertised mss (i.e. the segment size we | |
232 | * advertise to the other end). | |
233 | */ | |
234 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu) | |
235 | { | |
236 | u32 min_mtu = 230; | |
237 | struct dn_dev *dn = dst->neighbour ? | |
fc766e4c | 238 | rcu_dereference_raw(dst->neighbour->dev->dn_ptr) : NULL; |
1da177e4 LT |
239 | |
240 | if (dn && dn->use_long == 0) | |
241 | min_mtu -= 6; | |
242 | else | |
243 | min_mtu -= 21; | |
244 | ||
5ffc02a1 | 245 | if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= min_mtu) { |
1da177e4 | 246 | if (!(dst_metric_locked(dst, RTAX_MTU))) { |
defb3519 | 247 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
248 | dst_set_expires(dst, dn_rt_mtu_expires); |
249 | } | |
250 | if (!(dst_metric_locked(dst, RTAX_ADVMSS))) { | |
251 | u32 mss = mtu - DN_MAX_NSP_DATA_HEADER; | |
0dbaee3b DM |
252 | u32 existing_mss = dst_metric_raw(dst, RTAX_ADVMSS); |
253 | if (!existing_mss || existing_mss > mss) | |
defb3519 | 254 | dst_metric_set(dst, RTAX_ADVMSS, mss); |
1da177e4 LT |
255 | } |
256 | } | |
257 | } | |
258 | ||
429eb0fa | 259 | /* |
1da177e4 LT |
260 | * When a route has been marked obsolete. (e.g. routing cache flush) |
261 | */ | |
262 | static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie) | |
263 | { | |
264 | return NULL; | |
265 | } | |
266 | ||
267 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst) | |
268 | { | |
269 | dst_release(dst); | |
270 | return NULL; | |
271 | } | |
272 | ||
273 | static void dn_dst_link_failure(struct sk_buff *skb) | |
274 | { | |
1da177e4 LT |
275 | } |
276 | ||
277 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) | |
278 | { | |
5811662b CG |
279 | return ((fl1->fld_dst ^ fl2->fld_dst) | |
280 | (fl1->fld_src ^ fl2->fld_src) | | |
47dcf0cb | 281 | (fl1->mark ^ fl2->mark) | |
5811662b | 282 | (fl1->fld_scope ^ fl2->fld_scope) | |
8238b218 DM |
283 | (fl1->oif ^ fl2->oif) | |
284 | (fl1->iif ^ fl2->iif)) == 0; | |
1da177e4 LT |
285 | } |
286 | ||
287 | static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp) | |
288 | { | |
fc766e4c ED |
289 | struct dn_route *rth; |
290 | struct dn_route __rcu **rthp; | |
1da177e4 LT |
291 | unsigned long now = jiffies; |
292 | ||
293 | rthp = &dn_rt_hash_table[hash].chain; | |
294 | ||
295 | spin_lock_bh(&dn_rt_hash_table[hash].lock); | |
fc766e4c ED |
296 | while ((rth = rcu_dereference_protected(*rthp, |
297 | lockdep_is_held(&dn_rt_hash_table[hash].lock))) != NULL) { | |
1da177e4 LT |
298 | if (compare_keys(&rth->fl, &rt->fl)) { |
299 | /* Put it first */ | |
d8d1f30b CG |
300 | *rthp = rth->dst.dn_next; |
301 | rcu_assign_pointer(rth->dst.dn_next, | |
1da177e4 LT |
302 | dn_rt_hash_table[hash].chain); |
303 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth); | |
304 | ||
d8d1f30b | 305 | dst_use(&rth->dst, now); |
1da177e4 LT |
306 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
307 | ||
308 | dnrt_drop(rt); | |
309 | *rp = rth; | |
310 | return 0; | |
311 | } | |
d8d1f30b | 312 | rthp = &rth->dst.dn_next; |
1da177e4 LT |
313 | } |
314 | ||
d8d1f30b | 315 | rcu_assign_pointer(rt->dst.dn_next, dn_rt_hash_table[hash].chain); |
1da177e4 | 316 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt); |
429eb0fa | 317 | |
d8d1f30b | 318 | dst_use(&rt->dst, now); |
1da177e4 LT |
319 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
320 | *rp = rt; | |
321 | return 0; | |
322 | } | |
323 | ||
5eaa65b2 | 324 | static void dn_run_flush(unsigned long dummy) |
1da177e4 LT |
325 | { |
326 | int i; | |
327 | struct dn_route *rt, *next; | |
328 | ||
fc766e4c | 329 | for (i = 0; i < dn_rt_hash_mask; i++) { |
1da177e4 LT |
330 | spin_lock_bh(&dn_rt_hash_table[i].lock); |
331 | ||
fc766e4c | 332 | if ((rt = xchg((struct dn_route **)&dn_rt_hash_table[i].chain, NULL)) == NULL) |
1da177e4 LT |
333 | goto nothing_to_declare; |
334 | ||
fc766e4c ED |
335 | for(; rt; rt = next) { |
336 | next = rcu_dereference_raw(rt->dst.dn_next); | |
337 | RCU_INIT_POINTER(rt->dst.dn_next, NULL); | |
1da177e4 LT |
338 | dst_free((struct dst_entry *)rt); |
339 | } | |
340 | ||
341 | nothing_to_declare: | |
342 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
343 | } | |
344 | } | |
345 | ||
346 | static DEFINE_SPINLOCK(dn_rt_flush_lock); | |
347 | ||
348 | void dn_rt_cache_flush(int delay) | |
349 | { | |
350 | unsigned long now = jiffies; | |
351 | int user_mode = !in_interrupt(); | |
352 | ||
353 | if (delay < 0) | |
354 | delay = dn_rt_min_delay; | |
355 | ||
356 | spin_lock_bh(&dn_rt_flush_lock); | |
357 | ||
358 | if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) { | |
359 | long tmo = (long)(dn_rt_deadline - now); | |
360 | ||
361 | if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay) | |
362 | tmo = 0; | |
363 | ||
364 | if (delay > tmo) | |
365 | delay = tmo; | |
366 | } | |
367 | ||
368 | if (delay <= 0) { | |
369 | spin_unlock_bh(&dn_rt_flush_lock); | |
370 | dn_run_flush(0); | |
371 | return; | |
372 | } | |
373 | ||
374 | if (dn_rt_deadline == 0) | |
375 | dn_rt_deadline = now + dn_rt_max_delay; | |
376 | ||
377 | dn_rt_flush_timer.expires = now + delay; | |
378 | add_timer(&dn_rt_flush_timer); | |
379 | spin_unlock_bh(&dn_rt_flush_lock); | |
380 | } | |
381 | ||
382 | /** | |
383 | * dn_return_short - Return a short packet to its sender | |
384 | * @skb: The packet to return | |
385 | * | |
386 | */ | |
387 | static int dn_return_short(struct sk_buff *skb) | |
388 | { | |
389 | struct dn_skb_cb *cb; | |
390 | unsigned char *ptr; | |
c4ea94ab SW |
391 | __le16 *src; |
392 | __le16 *dst; | |
1da177e4 LT |
393 | |
394 | /* Add back headers */ | |
d56f90a7 | 395 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
396 | |
397 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) | |
398 | return NET_RX_DROP; | |
399 | ||
400 | cb = DN_SKB_CB(skb); | |
401 | /* Skip packet length and point to flags */ | |
402 | ptr = skb->data + 2; | |
403 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; | |
404 | ||
c4ea94ab | 405 | dst = (__le16 *)ptr; |
1da177e4 | 406 | ptr += 2; |
c4ea94ab | 407 | src = (__le16 *)ptr; |
1da177e4 LT |
408 | ptr += 2; |
409 | *ptr = 0; /* Zero hop count */ | |
410 | ||
a0bffffc | 411 | swap(*src, *dst); |
1da177e4 LT |
412 | |
413 | skb->pkt_type = PACKET_OUTGOING; | |
414 | dn_rt_finish_output(skb, NULL, NULL); | |
415 | return NET_RX_SUCCESS; | |
416 | } | |
417 | ||
418 | /** | |
419 | * dn_return_long - Return a long packet to its sender | |
420 | * @skb: The long format packet to return | |
421 | * | |
422 | */ | |
423 | static int dn_return_long(struct sk_buff *skb) | |
424 | { | |
425 | struct dn_skb_cb *cb; | |
426 | unsigned char *ptr; | |
427 | unsigned char *src_addr, *dst_addr; | |
428 | unsigned char tmp[ETH_ALEN]; | |
429 | ||
430 | /* Add back all headers */ | |
d56f90a7 | 431 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
432 | |
433 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) | |
434 | return NET_RX_DROP; | |
435 | ||
436 | cb = DN_SKB_CB(skb); | |
437 | /* Ignore packet length and point to flags */ | |
438 | ptr = skb->data + 2; | |
439 | ||
440 | /* Skip padding */ | |
441 | if (*ptr & DN_RT_F_PF) { | |
442 | char padlen = (*ptr & ~DN_RT_F_PF); | |
443 | ptr += padlen; | |
444 | } | |
445 | ||
446 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; | |
447 | ptr += 2; | |
448 | dst_addr = ptr; | |
449 | ptr += 8; | |
450 | src_addr = ptr; | |
451 | ptr += 6; | |
452 | *ptr = 0; /* Zero hop count */ | |
453 | ||
454 | /* Swap source and destination */ | |
455 | memcpy(tmp, src_addr, ETH_ALEN); | |
456 | memcpy(src_addr, dst_addr, ETH_ALEN); | |
457 | memcpy(dst_addr, tmp, ETH_ALEN); | |
458 | ||
459 | skb->pkt_type = PACKET_OUTGOING; | |
460 | dn_rt_finish_output(skb, dst_addr, src_addr); | |
461 | return NET_RX_SUCCESS; | |
462 | } | |
463 | ||
464 | /** | |
465 | * dn_route_rx_packet - Try and find a route for an incoming packet | |
466 | * @skb: The packet to find a route for | |
467 | * | |
468 | * Returns: result of input function if route is found, error code otherwise | |
469 | */ | |
470 | static int dn_route_rx_packet(struct sk_buff *skb) | |
471 | { | |
fc766e4c | 472 | struct dn_skb_cb *cb; |
1da177e4 LT |
473 | int err; |
474 | ||
475 | if ((err = dn_route_input(skb)) == 0) | |
476 | return dst_input(skb); | |
477 | ||
fc766e4c | 478 | cb = DN_SKB_CB(skb); |
1da177e4 LT |
479 | if (decnet_debug_level & 4) { |
480 | char *devname = skb->dev ? skb->dev->name : "???"; | |
fc766e4c | 481 | |
1da177e4 LT |
482 | printk(KERN_DEBUG |
483 | "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 | 484 | (int)cb->rt_flags, devname, skb->len, |
c4106aa8 | 485 | le16_to_cpu(cb->src), le16_to_cpu(cb->dst), |
1da177e4 LT |
486 | err, skb->pkt_type); |
487 | } | |
488 | ||
489 | if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) { | |
490 | switch(cb->rt_flags & DN_RT_PKT_MSK) { | |
491 | case DN_RT_PKT_SHORT: | |
492 | return dn_return_short(skb); | |
493 | case DN_RT_PKT_LONG: | |
494 | return dn_return_long(skb); | |
495 | } | |
496 | } | |
497 | ||
498 | kfree_skb(skb); | |
499 | return NET_RX_DROP; | |
500 | } | |
501 | ||
502 | static int dn_route_rx_long(struct sk_buff *skb) | |
503 | { | |
504 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
505 | unsigned char *ptr = skb->data; | |
506 | ||
507 | if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */ | |
508 | goto drop_it; | |
509 | ||
510 | skb_pull(skb, 20); | |
badff6d0 | 511 | skb_reset_transport_header(skb); |
1da177e4 | 512 | |
429eb0fa YH |
513 | /* Destination info */ |
514 | ptr += 2; | |
c4ea94ab | 515 | cb->dst = dn_eth2dn(ptr); |
429eb0fa YH |
516 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
517 | goto drop_it; | |
518 | ptr += 6; | |
1da177e4 LT |
519 | |
520 | ||
429eb0fa YH |
521 | /* Source info */ |
522 | ptr += 2; | |
c4ea94ab | 523 | cb->src = dn_eth2dn(ptr); |
429eb0fa YH |
524 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
525 | goto drop_it; | |
526 | ptr += 6; | |
527 | /* Other junk */ | |
528 | ptr++; | |
529 | cb->hops = *ptr++; /* Visit Count */ | |
1da177e4 | 530 | |
5d877d87 JE |
531 | return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, |
532 | dn_route_rx_packet); | |
1da177e4 LT |
533 | |
534 | drop_it: | |
535 | kfree_skb(skb); | |
536 | return NET_RX_DROP; | |
537 | } | |
538 | ||
539 | ||
540 | ||
541 | static int dn_route_rx_short(struct sk_buff *skb) | |
542 | { | |
543 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
544 | unsigned char *ptr = skb->data; | |
545 | ||
546 | if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */ | |
547 | goto drop_it; | |
548 | ||
549 | skb_pull(skb, 5); | |
badff6d0 | 550 | skb_reset_transport_header(skb); |
1da177e4 | 551 | |
c4ea94ab | 552 | cb->dst = *(__le16 *)ptr; |
429eb0fa YH |
553 | ptr += 2; |
554 | cb->src = *(__le16 *)ptr; | |
555 | ptr += 2; | |
556 | cb->hops = *ptr & 0x3f; | |
1da177e4 | 557 | |
5d877d87 JE |
558 | return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, |
559 | dn_route_rx_packet); | |
1da177e4 LT |
560 | |
561 | drop_it: | |
429eb0fa YH |
562 | kfree_skb(skb); |
563 | return NET_RX_DROP; | |
1da177e4 LT |
564 | } |
565 | ||
566 | static int dn_route_discard(struct sk_buff *skb) | |
567 | { | |
568 | /* | |
569 | * I know we drop the packet here, but thats considered success in | |
570 | * this case | |
571 | */ | |
572 | kfree_skb(skb); | |
573 | return NET_RX_SUCCESS; | |
574 | } | |
575 | ||
576 | static int dn_route_ptp_hello(struct sk_buff *skb) | |
577 | { | |
578 | dn_dev_hello(skb); | |
579 | dn_neigh_pointopoint_hello(skb); | |
580 | return NET_RX_SUCCESS; | |
581 | } | |
582 | ||
f2ccd8fa | 583 | int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
584 | { |
585 | struct dn_skb_cb *cb; | |
586 | unsigned char flags = 0; | |
c4106aa8 | 587 | __u16 len = le16_to_cpu(*(__le16 *)skb->data); |
fc766e4c | 588 | struct dn_dev *dn = rcu_dereference(dev->dn_ptr); |
1da177e4 LT |
589 | unsigned char padlen = 0; |
590 | ||
721499e8 | 591 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
592 | goto dump_it; |
593 | ||
1da177e4 LT |
594 | if (dn == NULL) |
595 | goto dump_it; | |
596 | ||
597 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
598 | goto out; | |
599 | ||
600 | if (!pskb_may_pull(skb, 3)) | |
601 | goto dump_it; | |
602 | ||
603 | skb_pull(skb, 2); | |
604 | ||
605 | if (len > skb->len) | |
606 | goto dump_it; | |
607 | ||
608 | skb_trim(skb, len); | |
609 | ||
610 | flags = *skb->data; | |
611 | ||
612 | cb = DN_SKB_CB(skb); | |
613 | cb->stamp = jiffies; | |
614 | cb->iif = dev->ifindex; | |
615 | ||
616 | /* | |
617 | * If we have padding, remove it. | |
618 | */ | |
619 | if (flags & DN_RT_F_PF) { | |
620 | padlen = flags & ~DN_RT_F_PF; | |
621 | if (!pskb_may_pull(skb, padlen + 1)) | |
622 | goto dump_it; | |
623 | skb_pull(skb, padlen); | |
624 | flags = *skb->data; | |
625 | } | |
626 | ||
c1d2bbe1 | 627 | skb_reset_network_header(skb); |
1da177e4 LT |
628 | |
629 | /* | |
630 | * Weed out future version DECnet | |
631 | */ | |
632 | if (flags & DN_RT_F_VER) | |
633 | goto dump_it; | |
634 | ||
635 | cb->rt_flags = flags; | |
636 | ||
637 | if (decnet_debug_level & 1) | |
429eb0fa | 638 | printk(KERN_DEBUG |
1da177e4 | 639 | "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n", |
429eb0fa | 640 | (int)flags, (dev) ? dev->name : "???", len, skb->len, |
1da177e4 LT |
641 | padlen); |
642 | ||
429eb0fa | 643 | if (flags & DN_RT_PKT_CNTL) { |
364c6bad | 644 | if (unlikely(skb_linearize(skb))) |
1da177e4 LT |
645 | goto dump_it; |
646 | ||
429eb0fa YH |
647 | switch(flags & DN_RT_CNTL_MSK) { |
648 | case DN_RT_PKT_INIT: | |
1da177e4 LT |
649 | dn_dev_init_pkt(skb); |
650 | break; | |
429eb0fa | 651 | case DN_RT_PKT_VERI: |
1da177e4 LT |
652 | dn_dev_veri_pkt(skb); |
653 | break; | |
654 | } | |
655 | ||
656 | if (dn->parms.state != DN_DEV_S_RU) | |
657 | goto dump_it; | |
658 | ||
659 | switch(flags & DN_RT_CNTL_MSK) { | |
429eb0fa | 660 | case DN_RT_PKT_HELO: |
5d877d87 JE |
661 | return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, |
662 | skb, skb->dev, NULL, | |
663 | dn_route_ptp_hello); | |
1da177e4 | 664 | |
429eb0fa YH |
665 | case DN_RT_PKT_L1RT: |
666 | case DN_RT_PKT_L2RT: | |
5d877d87 JE |
667 | return NF_HOOK(NFPROTO_DECNET, NF_DN_ROUTE, |
668 | skb, skb->dev, NULL, | |
669 | dn_route_discard); | |
429eb0fa | 670 | case DN_RT_PKT_ERTH: |
5d877d87 JE |
671 | return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, |
672 | skb, skb->dev, NULL, | |
673 | dn_neigh_router_hello); | |
1da177e4 | 674 | |
429eb0fa | 675 | case DN_RT_PKT_EEDH: |
5d877d87 JE |
676 | return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO, |
677 | skb, skb->dev, NULL, | |
678 | dn_neigh_endnode_hello); | |
429eb0fa YH |
679 | } |
680 | } else { | |
1da177e4 LT |
681 | if (dn->parms.state != DN_DEV_S_RU) |
682 | goto dump_it; | |
683 | ||
684 | skb_pull(skb, 1); /* Pull flags */ | |
685 | ||
429eb0fa YH |
686 | switch(flags & DN_RT_PKT_MSK) { |
687 | case DN_RT_PKT_LONG: | |
688 | return dn_route_rx_long(skb); | |
689 | case DN_RT_PKT_SHORT: | |
690 | return dn_route_rx_short(skb); | |
1da177e4 | 691 | } |
429eb0fa | 692 | } |
1da177e4 LT |
693 | |
694 | dump_it: | |
695 | kfree_skb(skb); | |
696 | out: | |
697 | return NET_RX_DROP; | |
698 | } | |
699 | ||
700 | static int dn_output(struct sk_buff *skb) | |
701 | { | |
adf30907 | 702 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
703 | struct dn_route *rt = (struct dn_route *)dst; |
704 | struct net_device *dev = dst->dev; | |
705 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
706 | struct neighbour *neigh; | |
707 | ||
708 | int err = -EINVAL; | |
709 | ||
710 | if ((neigh = dst->neighbour) == NULL) | |
711 | goto error; | |
712 | ||
713 | skb->dev = dev; | |
714 | ||
715 | cb->src = rt->rt_saddr; | |
716 | cb->dst = rt->rt_daddr; | |
717 | ||
718 | /* | |
719 | * Always set the Intra-Ethernet bit on all outgoing packets | |
720 | * originated on this node. Only valid flag from upper layers | |
721 | * is return-to-sender-requested. Set hop count to 0 too. | |
722 | */ | |
723 | cb->rt_flags &= ~DN_RT_F_RQR; | |
724 | cb->rt_flags |= DN_RT_F_IE; | |
725 | cb->hops = 0; | |
726 | ||
5d877d87 JE |
727 | return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_OUT, skb, NULL, dev, |
728 | neigh->output); | |
1da177e4 LT |
729 | |
730 | error: | |
731 | if (net_ratelimit()) | |
732 | printk(KERN_DEBUG "dn_output: This should not happen\n"); | |
733 | ||
734 | kfree_skb(skb); | |
735 | ||
736 | return err; | |
737 | } | |
738 | ||
739 | static int dn_forward(struct sk_buff *skb) | |
740 | { | |
741 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
adf30907 | 742 | struct dst_entry *dst = skb_dst(skb); |
fc766e4c | 743 | struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr); |
1da177e4 LT |
744 | struct dn_route *rt; |
745 | struct neighbour *neigh = dst->neighbour; | |
746 | int header_len; | |
747 | #ifdef CONFIG_NETFILTER | |
748 | struct net_device *dev = skb->dev; | |
749 | #endif | |
750 | ||
751 | if (skb->pkt_type != PACKET_HOST) | |
752 | goto drop; | |
753 | ||
754 | /* Ensure that we have enough space for headers */ | |
adf30907 | 755 | rt = (struct dn_route *)skb_dst(skb); |
1da177e4 | 756 | header_len = dn_db->use_long ? 21 : 6; |
d8d1f30b | 757 | if (skb_cow(skb, LL_RESERVED_SPACE(rt->dst.dev)+header_len)) |
1da177e4 LT |
758 | goto drop; |
759 | ||
760 | /* | |
761 | * Hop count exceeded. | |
762 | */ | |
763 | if (++cb->hops > 30) | |
764 | goto drop; | |
765 | ||
d8d1f30b | 766 | skb->dev = rt->dst.dev; |
1da177e4 LT |
767 | |
768 | /* | |
769 | * If packet goes out same interface it came in on, then set | |
770 | * the Intra-Ethernet bit. This has no effect for short | |
771 | * packets, so we don't need to test for them here. | |
772 | */ | |
773 | cb->rt_flags &= ~DN_RT_F_IE; | |
774 | if (rt->rt_flags & RTCF_DOREDIRECT) | |
775 | cb->rt_flags |= DN_RT_F_IE; | |
776 | ||
5d877d87 JE |
777 | return NF_HOOK(NFPROTO_DECNET, NF_DN_FORWARD, skb, dev, skb->dev, |
778 | neigh->output); | |
1da177e4 LT |
779 | |
780 | drop: | |
781 | kfree_skb(skb); | |
782 | return NET_RX_DROP; | |
783 | } | |
784 | ||
1da177e4 LT |
785 | /* |
786 | * Used to catch bugs. This should never normally get | |
787 | * called. | |
788 | */ | |
789 | static int dn_rt_bug(struct sk_buff *skb) | |
790 | { | |
791 | if (net_ratelimit()) { | |
792 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
793 | ||
794 | printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n", | |
c4106aa8 | 795 | le16_to_cpu(cb->src), le16_to_cpu(cb->dst)); |
1da177e4 LT |
796 | } |
797 | ||
798 | kfree_skb(skb); | |
799 | ||
0e8635a8 | 800 | return NET_RX_DROP; |
1da177e4 LT |
801 | } |
802 | ||
0dbaee3b DM |
803 | static unsigned int dn_dst_default_advmss(const struct dst_entry *dst) |
804 | { | |
805 | return dn_mss_from_pmtu(dst->dev, dst_mtu(dst)); | |
806 | } | |
807 | ||
d33e4553 DM |
808 | static unsigned int dn_dst_default_mtu(const struct dst_entry *dst) |
809 | { | |
810 | return dst->dev->mtu; | |
811 | } | |
812 | ||
1da177e4 LT |
813 | static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res) |
814 | { | |
815 | struct dn_fib_info *fi = res->fi; | |
d8d1f30b | 816 | struct net_device *dev = rt->dst.dev; |
1da177e4 | 817 | struct neighbour *n; |
0dbaee3b | 818 | unsigned int metric; |
1da177e4 LT |
819 | |
820 | if (fi) { | |
821 | if (DN_FIB_RES_GW(*res) && | |
822 | DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
823 | rt->rt_gateway = DN_FIB_RES_GW(*res); | |
defb3519 | 824 | dst_import_metrics(&rt->dst, fi->fib_metrics); |
1da177e4 LT |
825 | } |
826 | rt->rt_type = res->type; | |
827 | ||
d8d1f30b | 828 | if (dev != NULL && rt->dst.neighbour == NULL) { |
1da177e4 LT |
829 | n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev); |
830 | if (IS_ERR(n)) | |
831 | return PTR_ERR(n); | |
d8d1f30b | 832 | rt->dst.neighbour = n; |
1da177e4 LT |
833 | } |
834 | ||
d33e4553 | 835 | if (dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu) |
defb3519 | 836 | dst_metric_set(&rt->dst, RTAX_MTU, rt->dst.dev->mtu); |
0dbaee3b DM |
837 | metric = dst_metric_raw(&rt->dst, RTAX_ADVMSS); |
838 | if (metric) { | |
839 | unsigned int mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->dst)); | |
840 | if (metric > mss) | |
841 | dst_metric_set(&rt->dst, RTAX_ADVMSS, mss); | |
842 | } | |
1da177e4 LT |
843 | return 0; |
844 | } | |
845 | ||
c4ea94ab | 846 | static inline int dn_match_addr(__le16 addr1, __le16 addr2) |
1da177e4 | 847 | { |
c4106aa8 | 848 | __u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(addr2); |
1da177e4 LT |
849 | int match = 16; |
850 | while(tmp) { | |
851 | tmp >>= 1; | |
852 | match--; | |
853 | } | |
854 | return match; | |
855 | } | |
856 | ||
c4ea94ab | 857 | static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope) |
1da177e4 | 858 | { |
c4ea94ab | 859 | __le16 saddr = 0; |
fc766e4c | 860 | struct dn_dev *dn_db; |
1da177e4 LT |
861 | struct dn_ifaddr *ifa; |
862 | int best_match = 0; | |
863 | int ret; | |
864 | ||
fc766e4c ED |
865 | rcu_read_lock(); |
866 | dn_db = rcu_dereference(dev->dn_ptr); | |
867 | for (ifa = rcu_dereference(dn_db->ifa_list); | |
868 | ifa != NULL; | |
869 | ifa = rcu_dereference(ifa->ifa_next)) { | |
1da177e4 LT |
870 | if (ifa->ifa_scope > scope) |
871 | continue; | |
872 | if (!daddr) { | |
873 | saddr = ifa->ifa_local; | |
874 | break; | |
875 | } | |
876 | ret = dn_match_addr(daddr, ifa->ifa_local); | |
877 | if (ret > best_match) | |
878 | saddr = ifa->ifa_local; | |
879 | if (best_match == 0) | |
880 | saddr = ifa->ifa_local; | |
881 | } | |
fc766e4c | 882 | rcu_read_unlock(); |
1da177e4 LT |
883 | |
884 | return saddr; | |
885 | } | |
886 | ||
c4ea94ab | 887 | static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res) |
1da177e4 LT |
888 | { |
889 | return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope); | |
890 | } | |
891 | ||
c4ea94ab | 892 | static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res) |
1da177e4 | 893 | { |
c4ea94ab | 894 | __le16 mask = dnet_make_mask(res->prefixlen); |
1da177e4 LT |
895 | return (daddr&~mask)|res->fi->fib_nh->nh_gw; |
896 | } | |
897 | ||
898 | static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard) | |
899 | { | |
5811662b CG |
900 | struct flowi fl = { .fld_dst = oldflp->fld_dst, |
901 | .fld_src = oldflp->fld_src, | |
902 | .fld_scope = RT_SCOPE_UNIVERSE, | |
47dcf0cb | 903 | .mark = oldflp->mark, |
2774c7ab | 904 | .iif = init_net.loopback_dev->ifindex, |
1da177e4 LT |
905 | .oif = oldflp->oif }; |
906 | struct dn_route *rt = NULL; | |
7562f876 | 907 | struct net_device *dev_out = NULL, *dev; |
1da177e4 LT |
908 | struct neighbour *neigh = NULL; |
909 | unsigned hash; | |
910 | unsigned flags = 0; | |
911 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST }; | |
912 | int err; | |
913 | int free_res = 0; | |
c4ea94ab | 914 | __le16 gateway = 0; |
1da177e4 LT |
915 | |
916 | if (decnet_debug_level & 16) | |
917 | printk(KERN_DEBUG | |
918 | "dn_route_output_slow: dst=%04x src=%04x mark=%d" | |
c4106aa8 HH |
919 | " iif=%d oif=%d\n", le16_to_cpu(oldflp->fld_dst), |
920 | le16_to_cpu(oldflp->fld_src), | |
2774c7ab | 921 | oldflp->mark, init_net.loopback_dev->ifindex, oldflp->oif); |
1da177e4 LT |
922 | |
923 | /* If we have an output interface, verify its a DECnet device */ | |
924 | if (oldflp->oif) { | |
881d966b | 925 | dev_out = dev_get_by_index(&init_net, oldflp->oif); |
1da177e4 LT |
926 | err = -ENODEV; |
927 | if (dev_out && dev_out->dn_ptr == NULL) { | |
928 | dev_put(dev_out); | |
929 | dev_out = NULL; | |
930 | } | |
931 | if (dev_out == NULL) | |
932 | goto out; | |
933 | } | |
934 | ||
935 | /* If we have a source address, verify that its a local address */ | |
936 | if (oldflp->fld_src) { | |
937 | err = -EADDRNOTAVAIL; | |
938 | ||
939 | if (dev_out) { | |
940 | if (dn_dev_islocal(dev_out, oldflp->fld_src)) | |
941 | goto source_ok; | |
942 | dev_put(dev_out); | |
943 | goto out; | |
944 | } | |
c6d14c84 ED |
945 | rcu_read_lock(); |
946 | for_each_netdev_rcu(&init_net, dev) { | |
7562f876 | 947 | if (!dev->dn_ptr) |
1da177e4 | 948 | continue; |
7562f876 | 949 | if (!dn_dev_islocal(dev, oldflp->fld_src)) |
9bbf28a1 | 950 | continue; |
7562f876 | 951 | if ((dev->flags & IFF_LOOPBACK) && |
9bbf28a1 | 952 | oldflp->fld_dst && |
7562f876 | 953 | !dn_dev_islocal(dev, oldflp->fld_dst)) |
9bbf28a1 | 954 | continue; |
7562f876 PE |
955 | |
956 | dev_out = dev; | |
9bbf28a1 | 957 | break; |
1da177e4 | 958 | } |
c6d14c84 | 959 | rcu_read_unlock(); |
1da177e4 LT |
960 | if (dev_out == NULL) |
961 | goto out; | |
962 | dev_hold(dev_out); | |
963 | source_ok: | |
964 | ; | |
965 | } | |
966 | ||
967 | /* No destination? Assume its local */ | |
968 | if (!fl.fld_dst) { | |
969 | fl.fld_dst = fl.fld_src; | |
970 | ||
971 | err = -EADDRNOTAVAIL; | |
972 | if (dev_out) | |
973 | dev_put(dev_out); | |
2774c7ab | 974 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
975 | dev_hold(dev_out); |
976 | if (!fl.fld_dst) { | |
977 | fl.fld_dst = | |
978 | fl.fld_src = dnet_select_source(dev_out, 0, | |
979 | RT_SCOPE_HOST); | |
980 | if (!fl.fld_dst) | |
981 | goto out; | |
982 | } | |
2774c7ab | 983 | fl.oif = init_net.loopback_dev->ifindex; |
1da177e4 LT |
984 | res.type = RTN_LOCAL; |
985 | goto make_route; | |
986 | } | |
987 | ||
988 | if (decnet_debug_level & 16) | |
989 | printk(KERN_DEBUG | |
990 | "dn_route_output_slow: initial checks complete." | |
c4ea94ab | 991 | " dst=%o4x src=%04x oif=%d try_hard=%d\n", |
c4106aa8 | 992 | le16_to_cpu(fl.fld_dst), le16_to_cpu(fl.fld_src), |
c4ea94ab | 993 | fl.oif, try_hard); |
1da177e4 LT |
994 | |
995 | /* | |
996 | * N.B. If the kernel is compiled without router support then | |
997 | * dn_fib_lookup() will evaluate to non-zero so this if () block | |
998 | * will always be executed. | |
999 | */ | |
1000 | err = -ESRCH; | |
1001 | if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) { | |
1002 | struct dn_dev *dn_db; | |
1003 | if (err != -ESRCH) | |
1004 | goto out; | |
1005 | /* | |
429eb0fa | 1006 | * Here the fallback is basically the standard algorithm for |
1da177e4 LT |
1007 | * routing in endnodes which is described in the DECnet routing |
1008 | * docs | |
1009 | * | |
1010 | * If we are not trying hard, look in neighbour cache. | |
1011 | * The result is tested to ensure that if a specific output | |
429eb0fa | 1012 | * device/source address was requested, then we honour that |
1da177e4 LT |
1013 | * here |
1014 | */ | |
1015 | if (!try_hard) { | |
426b5303 | 1016 | neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fl.fld_dst); |
1da177e4 | 1017 | if (neigh) { |
429eb0fa | 1018 | if ((oldflp->oif && |
1da177e4 LT |
1019 | (neigh->dev->ifindex != oldflp->oif)) || |
1020 | (oldflp->fld_src && | |
1021 | (!dn_dev_islocal(neigh->dev, | |
1022 | oldflp->fld_src)))) { | |
1023 | neigh_release(neigh); | |
1024 | neigh = NULL; | |
1025 | } else { | |
1026 | if (dev_out) | |
1027 | dev_put(dev_out); | |
1028 | if (dn_dev_islocal(neigh->dev, fl.fld_dst)) { | |
2774c7ab | 1029 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1030 | res.type = RTN_LOCAL; |
1031 | } else { | |
1032 | dev_out = neigh->dev; | |
1033 | } | |
1034 | dev_hold(dev_out); | |
1035 | goto select_source; | |
1036 | } | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | /* Not there? Perhaps its a local address */ | |
1041 | if (dev_out == NULL) | |
1042 | dev_out = dn_dev_get_default(); | |
1043 | err = -ENODEV; | |
1044 | if (dev_out == NULL) | |
1045 | goto out; | |
fc766e4c | 1046 | dn_db = rcu_dereference_raw(dev_out->dn_ptr); |
1da177e4 LT |
1047 | /* Possible improvement - check all devices for local addr */ |
1048 | if (dn_dev_islocal(dev_out, fl.fld_dst)) { | |
1049 | dev_put(dev_out); | |
2774c7ab | 1050 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1051 | dev_hold(dev_out); |
1052 | res.type = RTN_LOCAL; | |
1053 | goto select_source; | |
1054 | } | |
1055 | /* Not local either.... try sending it to the default router */ | |
1056 | neigh = neigh_clone(dn_db->router); | |
1057 | BUG_ON(neigh && neigh->dev != dev_out); | |
1058 | ||
1059 | /* Ok then, we assume its directly connected and move on */ | |
1060 | select_source: | |
1061 | if (neigh) | |
1062 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1063 | if (gateway == 0) | |
1064 | gateway = fl.fld_dst; | |
1065 | if (fl.fld_src == 0) { | |
1066 | fl.fld_src = dnet_select_source(dev_out, gateway, | |
1067 | res.type == RTN_LOCAL ? | |
429eb0fa | 1068 | RT_SCOPE_HOST : |
1da177e4 LT |
1069 | RT_SCOPE_LINK); |
1070 | if (fl.fld_src == 0 && res.type != RTN_LOCAL) | |
1071 | goto e_addr; | |
1072 | } | |
1073 | fl.oif = dev_out->ifindex; | |
1074 | goto make_route; | |
1075 | } | |
1076 | free_res = 1; | |
1077 | ||
1078 | if (res.type == RTN_NAT) | |
1079 | goto e_inval; | |
1080 | ||
1081 | if (res.type == RTN_LOCAL) { | |
1082 | if (!fl.fld_src) | |
1083 | fl.fld_src = fl.fld_dst; | |
1084 | if (dev_out) | |
1085 | dev_put(dev_out); | |
2774c7ab | 1086 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1087 | dev_hold(dev_out); |
1088 | fl.oif = dev_out->ifindex; | |
1089 | if (res.fi) | |
1090 | dn_fib_info_put(res.fi); | |
1091 | res.fi = NULL; | |
1092 | goto make_route; | |
1093 | } | |
1094 | ||
1095 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
1096 | dn_fib_select_multipath(&fl, &res); | |
1097 | ||
429eb0fa | 1098 | /* |
1da177e4 LT |
1099 | * We could add some logic to deal with default routes here and |
1100 | * get rid of some of the special casing above. | |
1101 | */ | |
1102 | ||
1103 | if (!fl.fld_src) | |
1104 | fl.fld_src = DN_FIB_RES_PREFSRC(res); | |
429eb0fa | 1105 | |
1da177e4 LT |
1106 | if (dev_out) |
1107 | dev_put(dev_out); | |
1108 | dev_out = DN_FIB_RES_DEV(res); | |
1109 | dev_hold(dev_out); | |
1110 | fl.oif = dev_out->ifindex; | |
1111 | gateway = DN_FIB_RES_GW(res); | |
1112 | ||
1113 | make_route: | |
1114 | if (dev_out->flags & IFF_LOOPBACK) | |
1115 | flags |= RTCF_LOCAL; | |
1116 | ||
1117 | rt = dst_alloc(&dn_dst_ops); | |
1118 | if (rt == NULL) | |
1119 | goto e_nobufs; | |
1120 | ||
d8d1f30b CG |
1121 | atomic_set(&rt->dst.__refcnt, 1); |
1122 | rt->dst.flags = DST_HOST; | |
1da177e4 LT |
1123 | |
1124 | rt->fl.fld_src = oldflp->fld_src; | |
1125 | rt->fl.fld_dst = oldflp->fld_dst; | |
1126 | rt->fl.oif = oldflp->oif; | |
1127 | rt->fl.iif = 0; | |
47dcf0cb | 1128 | rt->fl.mark = oldflp->mark; |
1da177e4 LT |
1129 | |
1130 | rt->rt_saddr = fl.fld_src; | |
1131 | rt->rt_daddr = fl.fld_dst; | |
1132 | rt->rt_gateway = gateway ? gateway : fl.fld_dst; | |
1133 | rt->rt_local_src = fl.fld_src; | |
1134 | ||
1135 | rt->rt_dst_map = fl.fld_dst; | |
1136 | rt->rt_src_map = fl.fld_src; | |
1137 | ||
d8d1f30b | 1138 | rt->dst.dev = dev_out; |
1da177e4 | 1139 | dev_hold(dev_out); |
d8d1f30b | 1140 | rt->dst.neighbour = neigh; |
1da177e4 LT |
1141 | neigh = NULL; |
1142 | ||
d8d1f30b CG |
1143 | rt->dst.lastuse = jiffies; |
1144 | rt->dst.output = dn_output; | |
1145 | rt->dst.input = dn_rt_bug; | |
1da177e4 LT |
1146 | rt->rt_flags = flags; |
1147 | if (flags & RTCF_LOCAL) | |
d8d1f30b | 1148 | rt->dst.input = dn_nsp_rx; |
1da177e4 LT |
1149 | |
1150 | err = dn_rt_set_next_hop(rt, &res); | |
1151 | if (err) | |
1152 | goto e_neighbour; | |
1153 | ||
1154 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); | |
1155 | dn_insert_route(rt, hash, (struct dn_route **)pprt); | |
1156 | ||
1157 | done: | |
1158 | if (neigh) | |
1159 | neigh_release(neigh); | |
1160 | if (free_res) | |
1161 | dn_fib_res_put(&res); | |
1162 | if (dev_out) | |
1163 | dev_put(dev_out); | |
1164 | out: | |
1165 | return err; | |
1166 | ||
1167 | e_addr: | |
429eb0fa YH |
1168 | err = -EADDRNOTAVAIL; |
1169 | goto done; | |
1da177e4 LT |
1170 | e_inval: |
1171 | err = -EINVAL; | |
1172 | goto done; | |
1173 | e_nobufs: | |
1174 | err = -ENOBUFS; | |
1175 | goto done; | |
1176 | e_neighbour: | |
d8d1f30b | 1177 | dst_free(&rt->dst); |
1da177e4 LT |
1178 | goto e_nobufs; |
1179 | } | |
1180 | ||
1181 | ||
1182 | /* | |
1183 | * N.B. The flags may be moved into the flowi at some future stage. | |
1184 | */ | |
1185 | static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags) | |
1186 | { | |
1187 | unsigned hash = dn_hash(flp->fld_src, flp->fld_dst); | |
1188 | struct dn_route *rt = NULL; | |
1189 | ||
1190 | if (!(flags & MSG_TRYHARD)) { | |
1191 | rcu_read_lock_bh(); | |
a898def2 | 1192 | for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt; |
d8d1f30b | 1193 | rt = rcu_dereference_bh(rt->dst.dn_next)) { |
1da177e4 LT |
1194 | if ((flp->fld_dst == rt->fl.fld_dst) && |
1195 | (flp->fld_src == rt->fl.fld_src) && | |
47dcf0cb | 1196 | (flp->mark == rt->fl.mark) && |
c7537967 | 1197 | dn_is_output_route(rt) && |
1da177e4 | 1198 | (rt->fl.oif == flp->oif)) { |
d8d1f30b | 1199 | dst_use(&rt->dst, jiffies); |
1da177e4 | 1200 | rcu_read_unlock_bh(); |
d8d1f30b | 1201 | *pprt = &rt->dst; |
1da177e4 LT |
1202 | return 0; |
1203 | } | |
1204 | } | |
1205 | rcu_read_unlock_bh(); | |
1206 | } | |
1207 | ||
1208 | return dn_route_output_slow(pprt, flp, flags); | |
1209 | } | |
1210 | ||
1211 | static int dn_route_output_key(struct dst_entry **pprt, struct flowi *flp, int flags) | |
1212 | { | |
1213 | int err; | |
1214 | ||
1215 | err = __dn_route_output_key(pprt, flp, flags); | |
1216 | if (err == 0 && flp->proto) { | |
52479b62 | 1217 | err = xfrm_lookup(&init_net, pprt, flp, NULL, 0); |
1da177e4 LT |
1218 | } |
1219 | return err; | |
1220 | } | |
1221 | ||
1222 | int dn_route_output_sock(struct dst_entry **pprt, struct flowi *fl, struct sock *sk, int flags) | |
1223 | { | |
1224 | int err; | |
1225 | ||
1226 | err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD); | |
1227 | if (err == 0 && fl->proto) { | |
52479b62 AD |
1228 | err = xfrm_lookup(&init_net, pprt, fl, sk, |
1229 | (flags & MSG_DONTWAIT) ? 0 : XFRM_LOOKUP_WAIT); | |
1da177e4 LT |
1230 | } |
1231 | return err; | |
1232 | } | |
1233 | ||
1234 | static int dn_route_input_slow(struct sk_buff *skb) | |
1235 | { | |
1236 | struct dn_route *rt = NULL; | |
1237 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1238 | struct net_device *in_dev = skb->dev; | |
1239 | struct net_device *out_dev = NULL; | |
1240 | struct dn_dev *dn_db; | |
1241 | struct neighbour *neigh = NULL; | |
1242 | unsigned hash; | |
1243 | int flags = 0; | |
c4ea94ab SW |
1244 | __le16 gateway = 0; |
1245 | __le16 local_src = 0; | |
5811662b CG |
1246 | struct flowi fl = { .fld_dst = cb->dst, |
1247 | .fld_src = cb->src, | |
1248 | .fld_scope = RT_SCOPE_UNIVERSE, | |
47dcf0cb | 1249 | .mark = skb->mark, |
1da177e4 LT |
1250 | .iif = skb->dev->ifindex }; |
1251 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE }; | |
1252 | int err = -EINVAL; | |
1253 | int free_res = 0; | |
1254 | ||
1255 | dev_hold(in_dev); | |
1256 | ||
fc766e4c | 1257 | if ((dn_db = rcu_dereference(in_dev->dn_ptr)) == NULL) |
1da177e4 LT |
1258 | goto out; |
1259 | ||
1260 | /* Zero source addresses are not allowed */ | |
1261 | if (fl.fld_src == 0) | |
1262 | goto out; | |
1263 | ||
1264 | /* | |
1265 | * In this case we've just received a packet from a source | |
1266 | * outside ourselves pretending to come from us. We don't | |
1267 | * allow it any further to prevent routing loops, spoofing and | |
1268 | * other nasties. Loopback packets already have the dst attached | |
1269 | * so this only affects packets which have originated elsewhere. | |
1270 | */ | |
1271 | err = -ENOTUNIQ; | |
1272 | if (dn_dev_islocal(in_dev, cb->src)) | |
1273 | goto out; | |
1274 | ||
1275 | err = dn_fib_lookup(&fl, &res); | |
1276 | if (err) { | |
1277 | if (err != -ESRCH) | |
1278 | goto out; | |
1279 | /* | |
1280 | * Is the destination us ? | |
1281 | */ | |
1282 | if (!dn_dev_islocal(in_dev, cb->dst)) | |
1283 | goto e_inval; | |
1284 | ||
1285 | res.type = RTN_LOCAL; | |
1da177e4 | 1286 | } else { |
c4ea94ab | 1287 | __le16 src_map = fl.fld_src; |
1da177e4 LT |
1288 | free_res = 1; |
1289 | ||
1290 | out_dev = DN_FIB_RES_DEV(res); | |
1291 | if (out_dev == NULL) { | |
1292 | if (net_ratelimit()) | |
1293 | printk(KERN_CRIT "Bug in dn_route_input_slow() " | |
1294 | "No output device\n"); | |
1295 | goto e_inval; | |
1296 | } | |
1297 | dev_hold(out_dev); | |
1298 | ||
1299 | if (res.r) | |
a8731cbf | 1300 | src_map = fl.fld_src; /* no NAT support for now */ |
1da177e4 LT |
1301 | |
1302 | gateway = DN_FIB_RES_GW(res); | |
1303 | if (res.type == RTN_NAT) { | |
1304 | fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res); | |
1305 | dn_fib_res_put(&res); | |
1306 | free_res = 0; | |
1307 | if (dn_fib_lookup(&fl, &res)) | |
1308 | goto e_inval; | |
1309 | free_res = 1; | |
1310 | if (res.type != RTN_UNICAST) | |
1311 | goto e_inval; | |
1312 | flags |= RTCF_DNAT; | |
1313 | gateway = fl.fld_dst; | |
1314 | } | |
1315 | fl.fld_src = src_map; | |
1316 | } | |
1317 | ||
1318 | switch(res.type) { | |
1319 | case RTN_UNICAST: | |
1320 | /* | |
1321 | * Forwarding check here, we only check for forwarding | |
1322 | * being turned off, if you want to only forward intra | |
1323 | * area, its up to you to set the routing tables up | |
1324 | * correctly. | |
1325 | */ | |
1326 | if (dn_db->parms.forwarding == 0) | |
1327 | goto e_inval; | |
1328 | ||
1329 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
1330 | dn_fib_select_multipath(&fl, &res); | |
1331 | ||
429eb0fa | 1332 | /* |
1da177e4 LT |
1333 | * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT |
1334 | * flag as a hint to set the intra-ethernet bit when | |
1335 | * forwarding. If we've got NAT in operation, we don't do | |
1336 | * this optimisation. | |
1337 | */ | |
1338 | if (out_dev == in_dev && !(flags & RTCF_NAT)) | |
1339 | flags |= RTCF_DOREDIRECT; | |
1340 | ||
1341 | local_src = DN_FIB_RES_PREFSRC(res); | |
1342 | ||
1343 | case RTN_BLACKHOLE: | |
1344 | case RTN_UNREACHABLE: | |
1345 | break; | |
1346 | case RTN_LOCAL: | |
1347 | flags |= RTCF_LOCAL; | |
1348 | fl.fld_src = cb->dst; | |
1349 | fl.fld_dst = cb->src; | |
1350 | ||
1351 | /* Routing tables gave us a gateway */ | |
1352 | if (gateway) | |
1353 | goto make_route; | |
1354 | ||
1355 | /* Packet was intra-ethernet, so we know its on-link */ | |
3a31b9d2 | 1356 | if (cb->rt_flags & DN_RT_F_IE) { |
1da177e4 LT |
1357 | gateway = cb->src; |
1358 | flags |= RTCF_DIRECTSRC; | |
1359 | goto make_route; | |
1360 | } | |
1361 | ||
1362 | /* Use the default router if there is one */ | |
1363 | neigh = neigh_clone(dn_db->router); | |
1364 | if (neigh) { | |
1365 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1366 | goto make_route; | |
1367 | } | |
1368 | ||
1369 | /* Close eyes and pray */ | |
1370 | gateway = cb->src; | |
1371 | flags |= RTCF_DIRECTSRC; | |
1372 | goto make_route; | |
1373 | default: | |
1374 | goto e_inval; | |
1375 | } | |
1376 | ||
1377 | make_route: | |
1378 | rt = dst_alloc(&dn_dst_ops); | |
1379 | if (rt == NULL) | |
1380 | goto e_nobufs; | |
1381 | ||
1382 | rt->rt_saddr = fl.fld_src; | |
1383 | rt->rt_daddr = fl.fld_dst; | |
1384 | rt->rt_gateway = fl.fld_dst; | |
1385 | if (gateway) | |
1386 | rt->rt_gateway = gateway; | |
1387 | rt->rt_local_src = local_src ? local_src : rt->rt_saddr; | |
1388 | ||
1389 | rt->rt_dst_map = fl.fld_dst; | |
1390 | rt->rt_src_map = fl.fld_src; | |
1391 | ||
1392 | rt->fl.fld_src = cb->src; | |
1393 | rt->fl.fld_dst = cb->dst; | |
1394 | rt->fl.oif = 0; | |
1395 | rt->fl.iif = in_dev->ifindex; | |
47dcf0cb | 1396 | rt->fl.mark = fl.mark; |
1da177e4 | 1397 | |
d8d1f30b CG |
1398 | rt->dst.flags = DST_HOST; |
1399 | rt->dst.neighbour = neigh; | |
1400 | rt->dst.dev = out_dev; | |
1401 | rt->dst.lastuse = jiffies; | |
1402 | rt->dst.output = dn_rt_bug; | |
1da177e4 LT |
1403 | switch(res.type) { |
1404 | case RTN_UNICAST: | |
d8d1f30b | 1405 | rt->dst.input = dn_forward; |
1da177e4 LT |
1406 | break; |
1407 | case RTN_LOCAL: | |
d8d1f30b CG |
1408 | rt->dst.output = dn_output; |
1409 | rt->dst.input = dn_nsp_rx; | |
1410 | rt->dst.dev = in_dev; | |
1da177e4 LT |
1411 | flags |= RTCF_LOCAL; |
1412 | break; | |
1413 | default: | |
1414 | case RTN_UNREACHABLE: | |
1415 | case RTN_BLACKHOLE: | |
d8d1f30b | 1416 | rt->dst.input = dst_discard; |
1da177e4 LT |
1417 | } |
1418 | rt->rt_flags = flags; | |
d8d1f30b CG |
1419 | if (rt->dst.dev) |
1420 | dev_hold(rt->dst.dev); | |
1da177e4 LT |
1421 | |
1422 | err = dn_rt_set_next_hop(rt, &res); | |
1423 | if (err) | |
1424 | goto e_neighbour; | |
1425 | ||
1426 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); | |
adf30907 | 1427 | dn_insert_route(rt, hash, &rt); |
d8d1f30b | 1428 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
1429 | |
1430 | done: | |
1431 | if (neigh) | |
1432 | neigh_release(neigh); | |
1433 | if (free_res) | |
1434 | dn_fib_res_put(&res); | |
1435 | dev_put(in_dev); | |
1436 | if (out_dev) | |
1437 | dev_put(out_dev); | |
1438 | out: | |
1439 | return err; | |
1440 | ||
1441 | e_inval: | |
1442 | err = -EINVAL; | |
1443 | goto done; | |
1444 | ||
1445 | e_nobufs: | |
1446 | err = -ENOBUFS; | |
1447 | goto done; | |
1448 | ||
1449 | e_neighbour: | |
d8d1f30b | 1450 | dst_free(&rt->dst); |
1da177e4 LT |
1451 | goto done; |
1452 | } | |
1453 | ||
5eaa65b2 | 1454 | static int dn_route_input(struct sk_buff *skb) |
1da177e4 LT |
1455 | { |
1456 | struct dn_route *rt; | |
1457 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1458 | unsigned hash = dn_hash(cb->src, cb->dst); | |
1459 | ||
adf30907 | 1460 | if (skb_dst(skb)) |
1da177e4 LT |
1461 | return 0; |
1462 | ||
1463 | rcu_read_lock(); | |
1464 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL; | |
d8d1f30b | 1465 | rt = rcu_dereference(rt->dst.dn_next)) { |
1da177e4 | 1466 | if ((rt->fl.fld_src == cb->src) && |
429eb0fa | 1467 | (rt->fl.fld_dst == cb->dst) && |
1da177e4 | 1468 | (rt->fl.oif == 0) && |
47dcf0cb | 1469 | (rt->fl.mark == skb->mark) && |
1da177e4 | 1470 | (rt->fl.iif == cb->iif)) { |
d8d1f30b | 1471 | dst_use(&rt->dst, jiffies); |
1da177e4 | 1472 | rcu_read_unlock(); |
adf30907 | 1473 | skb_dst_set(skb, (struct dst_entry *)rt); |
1da177e4 LT |
1474 | return 0; |
1475 | } | |
1476 | } | |
1477 | rcu_read_unlock(); | |
1478 | ||
1479 | return dn_route_input_slow(skb); | |
1480 | } | |
1481 | ||
b6544c0b JHS |
1482 | static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
1483 | int event, int nowait, unsigned int flags) | |
1da177e4 | 1484 | { |
adf30907 | 1485 | struct dn_route *rt = (struct dn_route *)skb_dst(skb); |
1da177e4 LT |
1486 | struct rtmsg *r; |
1487 | struct nlmsghdr *nlh; | |
27a884dc | 1488 | unsigned char *b = skb_tail_pointer(skb); |
e3703b3d | 1489 | long expires; |
1da177e4 | 1490 | |
b6544c0b | 1491 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); |
1da177e4 | 1492 | r = NLMSG_DATA(nlh); |
1da177e4 LT |
1493 | r->rtm_family = AF_DECnet; |
1494 | r->rtm_dst_len = 16; | |
1495 | r->rtm_src_len = 0; | |
1496 | r->rtm_tos = 0; | |
1497 | r->rtm_table = RT_TABLE_MAIN; | |
9e762a4a | 1498 | RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1da177e4 LT |
1499 | r->rtm_type = rt->rt_type; |
1500 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
1501 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
1502 | r->rtm_protocol = RTPROT_UNSPEC; | |
1503 | if (rt->rt_flags & RTCF_NOTIFY) | |
1504 | r->rtm_flags |= RTM_F_NOTIFY; | |
1505 | RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr); | |
1506 | if (rt->fl.fld_src) { | |
1507 | r->rtm_src_len = 16; | |
1508 | RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src); | |
1509 | } | |
d8d1f30b CG |
1510 | if (rt->dst.dev) |
1511 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->dst.dev->ifindex); | |
1da177e4 LT |
1512 | /* |
1513 | * Note to self - change this if input routes reverse direction when | |
1514 | * they deal only with inputs and not with replies like they do | |
1515 | * currently. | |
1516 | */ | |
1517 | RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src); | |
1518 | if (rt->rt_daddr != rt->rt_gateway) | |
1519 | RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway); | |
defb3519 | 1520 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
1da177e4 | 1521 | goto rtattr_failure; |
d8d1f30b CG |
1522 | expires = rt->dst.expires ? rt->dst.expires - jiffies : 0; |
1523 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0, expires, | |
1524 | rt->dst.error) < 0) | |
e3703b3d | 1525 | goto rtattr_failure; |
c7537967 | 1526 | if (dn_is_input_route(rt)) |
1da177e4 LT |
1527 | RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif); |
1528 | ||
27a884dc | 1529 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1530 | return skb->len; |
1531 | ||
1532 | nlmsg_failure: | |
1533 | rtattr_failure: | |
dc5fc579 | 1534 | nlmsg_trim(skb, b); |
429eb0fa | 1535 | return -1; |
1da177e4 LT |
1536 | } |
1537 | ||
1538 | /* | |
1539 | * This is called by both endnodes and routers now. | |
1540 | */ | |
fa34ddd7 | 1541 | static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 1542 | { |
3b1e0a65 | 1543 | struct net *net = sock_net(in_skb->sk); |
1da177e4 LT |
1544 | struct rtattr **rta = arg; |
1545 | struct rtmsg *rtm = NLMSG_DATA(nlh); | |
1546 | struct dn_route *rt = NULL; | |
1547 | struct dn_skb_cb *cb; | |
1548 | int err; | |
1549 | struct sk_buff *skb; | |
1550 | struct flowi fl; | |
1551 | ||
09ad9bc7 | 1552 | if (!net_eq(net, &init_net)) |
b854272b DL |
1553 | return -EINVAL; |
1554 | ||
1da177e4 LT |
1555 | memset(&fl, 0, sizeof(fl)); |
1556 | fl.proto = DNPROTO_NSP; | |
1557 | ||
1558 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1559 | if (skb == NULL) | |
1560 | return -ENOBUFS; | |
459a98ed | 1561 | skb_reset_mac_header(skb); |
1da177e4 LT |
1562 | cb = DN_SKB_CB(skb); |
1563 | ||
1564 | if (rta[RTA_SRC-1]) | |
1565 | memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2); | |
1566 | if (rta[RTA_DST-1]) | |
1567 | memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2); | |
1568 | if (rta[RTA_IIF-1]) | |
1569 | memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); | |
1570 | ||
1571 | if (fl.iif) { | |
1572 | struct net_device *dev; | |
881d966b | 1573 | if ((dev = dev_get_by_index(&init_net, fl.iif)) == NULL) { |
1da177e4 LT |
1574 | kfree_skb(skb); |
1575 | return -ENODEV; | |
1576 | } | |
1577 | if (!dev->dn_ptr) { | |
1578 | dev_put(dev); | |
1579 | kfree_skb(skb); | |
1580 | return -ENODEV; | |
1581 | } | |
b98999dc | 1582 | skb->protocol = htons(ETH_P_DNA_RT); |
1da177e4 LT |
1583 | skb->dev = dev; |
1584 | cb->src = fl.fld_src; | |
1585 | cb->dst = fl.fld_dst; | |
1586 | local_bh_disable(); | |
1587 | err = dn_route_input(skb); | |
1588 | local_bh_enable(); | |
1589 | memset(cb, 0, sizeof(struct dn_skb_cb)); | |
adf30907 | 1590 | rt = (struct dn_route *)skb_dst(skb); |
d8d1f30b CG |
1591 | if (!err && -rt->dst.error) |
1592 | err = rt->dst.error; | |
1da177e4 LT |
1593 | } else { |
1594 | int oif = 0; | |
1595 | if (rta[RTA_OIF - 1]) | |
1596 | memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int)); | |
1597 | fl.oif = oif; | |
1598 | err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0); | |
1599 | } | |
1600 | ||
1601 | if (skb->dev) | |
1602 | dev_put(skb->dev); | |
1603 | skb->dev = NULL; | |
1604 | if (err) | |
1605 | goto out_free; | |
d8d1f30b | 1606 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
1607 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
1608 | rt->rt_flags |= RTCF_NOTIFY; | |
1609 | ||
b6544c0b | 1610 | err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0); |
1da177e4 LT |
1611 | |
1612 | if (err == 0) | |
1613 | goto out_free; | |
1614 | if (err < 0) { | |
1615 | err = -EMSGSIZE; | |
1616 | goto out_free; | |
1617 | } | |
1618 | ||
97c53cac | 1619 | return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid); |
1da177e4 LT |
1620 | |
1621 | out_free: | |
1622 | kfree_skb(skb); | |
1623 | return err; | |
1624 | } | |
1625 | ||
1626 | /* | |
1627 | * For routers, this is called from dn_fib_dump, but for endnodes its | |
1628 | * called directly from the rtnetlink dispatch table. | |
1629 | */ | |
1630 | int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1631 | { | |
3b1e0a65 | 1632 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
1633 | struct dn_route *rt; |
1634 | int h, s_h; | |
1635 | int idx, s_idx; | |
1636 | ||
09ad9bc7 | 1637 | if (!net_eq(net, &init_net)) |
b854272b DL |
1638 | return 0; |
1639 | ||
1da177e4 LT |
1640 | if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg)) |
1641 | return -EINVAL; | |
1642 | if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)) | |
1643 | return 0; | |
1644 | ||
1645 | s_h = cb->args[0]; | |
1646 | s_idx = idx = cb->args[1]; | |
1647 | for(h = 0; h <= dn_rt_hash_mask; h++) { | |
1648 | if (h < s_h) | |
1649 | continue; | |
1650 | if (h > s_h) | |
1651 | s_idx = 0; | |
1652 | rcu_read_lock_bh(); | |
a898def2 | 1653 | for(rt = rcu_dereference_bh(dn_rt_hash_table[h].chain), idx = 0; |
1da177e4 | 1654 | rt; |
d8d1f30b | 1655 | rt = rcu_dereference_bh(rt->dst.dn_next), idx++) { |
1da177e4 LT |
1656 | if (idx < s_idx) |
1657 | continue; | |
d8d1f30b | 1658 | skb_dst_set(skb, dst_clone(&rt->dst)); |
1da177e4 | 1659 | if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid, |
429eb0fa | 1660 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 1661 | 1, NLM_F_MULTI) <= 0) { |
adf30907 | 1662 | skb_dst_drop(skb); |
1da177e4 LT |
1663 | rcu_read_unlock_bh(); |
1664 | goto done; | |
1665 | } | |
adf30907 | 1666 | skb_dst_drop(skb); |
1da177e4 LT |
1667 | } |
1668 | rcu_read_unlock_bh(); | |
1669 | } | |
1670 | ||
1671 | done: | |
1672 | cb->args[0] = h; | |
1673 | cb->args[1] = idx; | |
1674 | return skb->len; | |
1675 | } | |
1676 | ||
1677 | #ifdef CONFIG_PROC_FS | |
1678 | struct dn_rt_cache_iter_state { | |
1679 | int bucket; | |
1680 | }; | |
1681 | ||
1682 | static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq) | |
1683 | { | |
1684 | struct dn_route *rt = NULL; | |
1685 | struct dn_rt_cache_iter_state *s = seq->private; | |
1686 | ||
1687 | for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) { | |
1688 | rcu_read_lock_bh(); | |
a898def2 | 1689 | rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); |
1da177e4 LT |
1690 | if (rt) |
1691 | break; | |
1692 | rcu_read_unlock_bh(); | |
1693 | } | |
a898def2 | 1694 | return rt; |
1da177e4 LT |
1695 | } |
1696 | ||
1697 | static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt) | |
1698 | { | |
0d89d794 | 1699 | struct dn_rt_cache_iter_state *s = seq->private; |
1da177e4 | 1700 | |
fc766e4c ED |
1701 | rt = rcu_dereference_bh(rt->dst.dn_next); |
1702 | while (!rt) { | |
1da177e4 LT |
1703 | rcu_read_unlock_bh(); |
1704 | if (--s->bucket < 0) | |
1705 | break; | |
1706 | rcu_read_lock_bh(); | |
fc766e4c | 1707 | rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain); |
1da177e4 | 1708 | } |
fc766e4c | 1709 | return rt; |
1da177e4 LT |
1710 | } |
1711 | ||
1712 | static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
1713 | { | |
1714 | struct dn_route *rt = dn_rt_cache_get_first(seq); | |
1715 | ||
1716 | if (rt) { | |
1717 | while(*pos && (rt = dn_rt_cache_get_next(seq, rt))) | |
1718 | --*pos; | |
1719 | } | |
1720 | return *pos ? NULL : rt; | |
1721 | } | |
1722 | ||
1723 | static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1724 | { | |
1725 | struct dn_route *rt = dn_rt_cache_get_next(seq, v); | |
1726 | ++*pos; | |
1727 | return rt; | |
1728 | } | |
1729 | ||
1730 | static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v) | |
1731 | { | |
1732 | if (v) | |
1733 | rcu_read_unlock_bh(); | |
1734 | } | |
1735 | ||
1736 | static int dn_rt_cache_seq_show(struct seq_file *seq, void *v) | |
1737 | { | |
1738 | struct dn_route *rt = v; | |
1739 | char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN]; | |
1740 | ||
1741 | seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n", | |
d8d1f30b | 1742 | rt->dst.dev ? rt->dst.dev->name : "*", |
c4106aa8 HH |
1743 | dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1), |
1744 | dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2), | |
d8d1f30b CG |
1745 | atomic_read(&rt->dst.__refcnt), |
1746 | rt->dst.__use, | |
1747 | (int) dst_metric(&rt->dst, RTAX_RTT)); | |
1da177e4 | 1748 | return 0; |
429eb0fa | 1749 | } |
1da177e4 | 1750 | |
56b3d975 | 1751 | static const struct seq_operations dn_rt_cache_seq_ops = { |
1da177e4 LT |
1752 | .start = dn_rt_cache_seq_start, |
1753 | .next = dn_rt_cache_seq_next, | |
1754 | .stop = dn_rt_cache_seq_stop, | |
1755 | .show = dn_rt_cache_seq_show, | |
1756 | }; | |
1757 | ||
1758 | static int dn_rt_cache_seq_open(struct inode *inode, struct file *file) | |
1759 | { | |
31164088 PE |
1760 | return seq_open_private(file, &dn_rt_cache_seq_ops, |
1761 | sizeof(struct dn_rt_cache_iter_state)); | |
1da177e4 LT |
1762 | } |
1763 | ||
9a32144e | 1764 | static const struct file_operations dn_rt_cache_seq_fops = { |
1da177e4 LT |
1765 | .owner = THIS_MODULE, |
1766 | .open = dn_rt_cache_seq_open, | |
1767 | .read = seq_read, | |
1768 | .llseek = seq_lseek, | |
1769 | .release = seq_release_private, | |
1770 | }; | |
1771 | ||
1772 | #endif /* CONFIG_PROC_FS */ | |
1773 | ||
1774 | void __init dn_route_init(void) | |
1775 | { | |
1776 | int i, goal, order; | |
1777 | ||
e5d679f3 AD |
1778 | dn_dst_ops.kmem_cachep = |
1779 | kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0, | |
20c2df83 | 1780 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
fc66f95c | 1781 | dst_entries_init(&dn_dst_ops); |
b24b8a24 | 1782 | setup_timer(&dn_route_timer, dn_dst_check_expire, 0); |
1da177e4 LT |
1783 | dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; |
1784 | add_timer(&dn_route_timer); | |
1785 | ||
4481374c | 1786 | goal = totalram_pages >> (26 - PAGE_SHIFT); |
1da177e4 LT |
1787 | |
1788 | for(order = 0; (1UL << order) < goal; order++) | |
1789 | /* NOTHING */; | |
1790 | ||
429eb0fa YH |
1791 | /* |
1792 | * Only want 1024 entries max, since the table is very, very unlikely | |
1793 | * to be larger than that. | |
1794 | */ | |
1795 | while(order && ((((1UL << order) * PAGE_SIZE) / | |
1796 | sizeof(struct dn_rt_hash_bucket)) >= 2048)) | |
1797 | order--; | |
1798 | ||
1799 | do { | |
1800 | dn_rt_hash_mask = (1UL << order) * PAGE_SIZE / | |
1801 | sizeof(struct dn_rt_hash_bucket); | |
1802 | while(dn_rt_hash_mask & (dn_rt_hash_mask - 1)) | |
1803 | dn_rt_hash_mask--; | |
1804 | dn_rt_hash_table = (struct dn_rt_hash_bucket *) | |
1805 | __get_free_pages(GFP_ATOMIC, order); | |
1806 | } while (dn_rt_hash_table == NULL && --order > 0); | |
1da177e4 LT |
1807 | |
1808 | if (!dn_rt_hash_table) | |
429eb0fa | 1809 | panic("Failed to allocate DECnet route cache hash table\n"); |
1da177e4 | 1810 | |
429eb0fa YH |
1811 | printk(KERN_INFO |
1812 | "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n", | |
1813 | dn_rt_hash_mask, | |
1da177e4 LT |
1814 | (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024); |
1815 | ||
1816 | dn_rt_hash_mask--; | |
429eb0fa YH |
1817 | for(i = 0; i <= dn_rt_hash_mask; i++) { |
1818 | spin_lock_init(&dn_rt_hash_table[i].lock); | |
1819 | dn_rt_hash_table[i].chain = NULL; | |
1820 | } | |
1da177e4 | 1821 | |
429eb0fa | 1822 | dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1); |
1da177e4 | 1823 | |
457c4cbc | 1824 | proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops); |
fa34ddd7 TG |
1825 | |
1826 | #ifdef CONFIG_DECNET_ROUTER | |
1827 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, dn_fib_dump); | |
1828 | #else | |
1829 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, | |
1830 | dn_cache_dump); | |
1831 | #endif | |
1da177e4 LT |
1832 | } |
1833 | ||
1834 | void __exit dn_route_cleanup(void) | |
1835 | { | |
1836 | del_timer(&dn_route_timer); | |
1837 | dn_run_flush(0); | |
1838 | ||
457c4cbc | 1839 | proc_net_remove(&init_net, "decnet_cache"); |
fc66f95c | 1840 | dst_entries_destroy(&dn_dst_ops); |
1da177e4 LT |
1841 | } |
1842 |