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