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