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