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> | |
69 | #include <net/sock.h> | |
70 | #include <linux/mm.h> | |
71 | #include <linux/proc_fs.h> | |
72 | #include <linux/seq_file.h> | |
73 | #include <linux/init.h> | |
74 | #include <linux/rtnetlink.h> | |
75 | #include <linux/string.h> | |
76 | #include <linux/netfilter_decnet.h> | |
77 | #include <linux/rcupdate.h> | |
78 | #include <linux/times.h> | |
79 | #include <asm/errno.h> | |
457c4cbc | 80 | #include <net/net_namespace.h> |
dc5fc579 | 81 | #include <net/netlink.h> |
1da177e4 LT |
82 | #include <net/neighbour.h> |
83 | #include <net/dst.h> | |
84 | #include <net/flow.h> | |
a8731cbf | 85 | #include <net/fib_rules.h> |
1da177e4 LT |
86 | #include <net/dn.h> |
87 | #include <net/dn_dev.h> | |
88 | #include <net/dn_nsp.h> | |
89 | #include <net/dn_route.h> | |
90 | #include <net/dn_neigh.h> | |
91 | #include <net/dn_fib.h> | |
92 | ||
93 | struct dn_rt_hash_bucket | |
94 | { | |
95 | struct dn_route *chain; | |
96 | spinlock_t lock; | |
97 | } __attribute__((__aligned__(8))); | |
98 | ||
99 | extern struct neigh_table dn_neigh_table; | |
100 | ||
101 | ||
102 | static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00}; | |
103 | ||
104 | static const int dn_rt_min_delay = 2 * HZ; | |
105 | static const int dn_rt_max_delay = 10 * HZ; | |
106 | static const int dn_rt_mtu_expires = 10 * 60 * HZ; | |
107 | ||
108 | static unsigned long dn_rt_deadline; | |
109 | ||
110 | static int dn_dst_gc(void); | |
111 | static struct dst_entry *dn_dst_check(struct dst_entry *, __u32); | |
112 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *); | |
113 | static void dn_dst_link_failure(struct sk_buff *); | |
114 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu); | |
115 | static int dn_route_input(struct sk_buff *); | |
116 | static void dn_run_flush(unsigned long dummy); | |
117 | ||
118 | static struct dn_rt_hash_bucket *dn_rt_hash_table; | |
119 | static unsigned dn_rt_hash_mask; | |
120 | ||
121 | static struct timer_list dn_route_timer; | |
8d06afab | 122 | static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0); |
1da177e4 LT |
123 | int decnet_dst_gc_interval = 2; |
124 | ||
125 | static struct dst_ops dn_dst_ops = { | |
126 | .family = PF_DECnet, | |
127 | .protocol = __constant_htons(ETH_P_DNA_RT), | |
128 | .gc_thresh = 128, | |
129 | .gc = dn_dst_gc, | |
130 | .check = dn_dst_check, | |
131 | .negative_advice = dn_dst_negative_advice, | |
132 | .link_failure = dn_dst_link_failure, | |
133 | .update_pmtu = dn_dst_update_pmtu, | |
134 | .entry_size = sizeof(struct dn_route), | |
135 | .entries = ATOMIC_INIT(0), | |
136 | }; | |
137 | ||
c4ea94ab | 138 | static __inline__ unsigned dn_hash(__le16 src, __le16 dst) |
1da177e4 | 139 | { |
c4ea94ab | 140 | __u16 tmp = (__u16 __force)(src ^ dst); |
1da177e4 LT |
141 | tmp ^= (tmp >> 3); |
142 | tmp ^= (tmp >> 5); | |
143 | tmp ^= (tmp >> 10); | |
144 | return dn_rt_hash_mask & (unsigned)tmp; | |
145 | } | |
146 | ||
147 | static inline void dnrt_free(struct dn_route *rt) | |
148 | { | |
149 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); | |
150 | } | |
151 | ||
152 | static inline void dnrt_drop(struct dn_route *rt) | |
153 | { | |
34001127 | 154 | dst_release(&rt->u.dst); |
1da177e4 LT |
155 | call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free); |
156 | } | |
157 | ||
158 | static void dn_dst_check_expire(unsigned long dummy) | |
159 | { | |
160 | int i; | |
161 | struct dn_route *rt, **rtp; | |
162 | unsigned long now = jiffies; | |
163 | unsigned long expire = 120 * HZ; | |
164 | ||
165 | for(i = 0; i <= dn_rt_hash_mask; i++) { | |
166 | rtp = &dn_rt_hash_table[i].chain; | |
167 | ||
168 | spin_lock(&dn_rt_hash_table[i].lock); | |
169 | while((rt=*rtp) != NULL) { | |
170 | if (atomic_read(&rt->u.dst.__refcnt) || | |
171 | (now - rt->u.dst.lastuse) < expire) { | |
0c195c3f | 172 | rtp = &rt->u.dst.dn_next; |
1da177e4 LT |
173 | continue; |
174 | } | |
0c195c3f ED |
175 | *rtp = rt->u.dst.dn_next; |
176 | rt->u.dst.dn_next = NULL; | |
1da177e4 LT |
177 | dnrt_free(rt); |
178 | } | |
179 | spin_unlock(&dn_rt_hash_table[i].lock); | |
180 | ||
181 | if ((jiffies - now) > 0) | |
182 | break; | |
183 | } | |
184 | ||
185 | mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ); | |
186 | } | |
187 | ||
188 | static int dn_dst_gc(void) | |
189 | { | |
190 | struct dn_route *rt, **rtp; | |
191 | int i; | |
192 | unsigned long now = jiffies; | |
193 | unsigned long expire = 10 * HZ; | |
194 | ||
195 | for(i = 0; i <= dn_rt_hash_mask; i++) { | |
196 | ||
197 | spin_lock_bh(&dn_rt_hash_table[i].lock); | |
198 | rtp = &dn_rt_hash_table[i].chain; | |
199 | ||
200 | while((rt=*rtp) != NULL) { | |
201 | if (atomic_read(&rt->u.dst.__refcnt) || | |
202 | (now - rt->u.dst.lastuse) < expire) { | |
0c195c3f | 203 | rtp = &rt->u.dst.dn_next; |
1da177e4 LT |
204 | continue; |
205 | } | |
0c195c3f ED |
206 | *rtp = rt->u.dst.dn_next; |
207 | rt->u.dst.dn_next = NULL; | |
1da177e4 LT |
208 | dnrt_drop(rt); |
209 | break; | |
210 | } | |
211 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
212 | } | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | /* | |
218 | * The decnet standards don't impose a particular minimum mtu, what they | |
219 | * do insist on is that the routing layer accepts a datagram of at least | |
220 | * 230 bytes long. Here we have to subtract the routing header length from | |
221 | * 230 to get the minimum acceptable mtu. If there is no neighbour, then we | |
222 | * assume the worst and use a long header size. | |
223 | * | |
224 | * We update both the mtu and the advertised mss (i.e. the segment size we | |
225 | * advertise to the other end). | |
226 | */ | |
227 | static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu) | |
228 | { | |
229 | u32 min_mtu = 230; | |
230 | struct dn_dev *dn = dst->neighbour ? | |
231 | (struct dn_dev *)dst->neighbour->dev->dn_ptr : NULL; | |
232 | ||
233 | if (dn && dn->use_long == 0) | |
234 | min_mtu -= 6; | |
235 | else | |
236 | min_mtu -= 21; | |
237 | ||
238 | if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= min_mtu) { | |
239 | if (!(dst_metric_locked(dst, RTAX_MTU))) { | |
240 | dst->metrics[RTAX_MTU-1] = mtu; | |
241 | dst_set_expires(dst, dn_rt_mtu_expires); | |
242 | } | |
243 | if (!(dst_metric_locked(dst, RTAX_ADVMSS))) { | |
244 | u32 mss = mtu - DN_MAX_NSP_DATA_HEADER; | |
245 | if (dst->metrics[RTAX_ADVMSS-1] > mss) | |
246 | dst->metrics[RTAX_ADVMSS-1] = mss; | |
247 | } | |
248 | } | |
249 | } | |
250 | ||
429eb0fa | 251 | /* |
1da177e4 LT |
252 | * When a route has been marked obsolete. (e.g. routing cache flush) |
253 | */ | |
254 | static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie) | |
255 | { | |
256 | return NULL; | |
257 | } | |
258 | ||
259 | static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst) | |
260 | { | |
261 | dst_release(dst); | |
262 | return NULL; | |
263 | } | |
264 | ||
265 | static void dn_dst_link_failure(struct sk_buff *skb) | |
266 | { | |
267 | return; | |
268 | } | |
269 | ||
270 | static inline int compare_keys(struct flowi *fl1, struct flowi *fl2) | |
271 | { | |
8238b218 DM |
272 | return ((fl1->nl_u.dn_u.daddr ^ fl2->nl_u.dn_u.daddr) | |
273 | (fl1->nl_u.dn_u.saddr ^ fl2->nl_u.dn_u.saddr) | | |
47dcf0cb | 274 | (fl1->mark ^ fl2->mark) | |
8238b218 DM |
275 | (fl1->nl_u.dn_u.scope ^ fl2->nl_u.dn_u.scope) | |
276 | (fl1->oif ^ fl2->oif) | | |
277 | (fl1->iif ^ fl2->iif)) == 0; | |
1da177e4 LT |
278 | } |
279 | ||
280 | static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp) | |
281 | { | |
282 | struct dn_route *rth, **rthp; | |
283 | unsigned long now = jiffies; | |
284 | ||
285 | rthp = &dn_rt_hash_table[hash].chain; | |
286 | ||
287 | spin_lock_bh(&dn_rt_hash_table[hash].lock); | |
288 | while((rth = *rthp) != NULL) { | |
289 | if (compare_keys(&rth->fl, &rt->fl)) { | |
290 | /* Put it first */ | |
0c195c3f ED |
291 | *rthp = rth->u.dst.dn_next; |
292 | rcu_assign_pointer(rth->u.dst.dn_next, | |
1da177e4 LT |
293 | dn_rt_hash_table[hash].chain); |
294 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth); | |
295 | ||
03f49f34 | 296 | dst_use(&rth->u.dst, now); |
1da177e4 LT |
297 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
298 | ||
299 | dnrt_drop(rt); | |
300 | *rp = rth; | |
301 | return 0; | |
302 | } | |
0c195c3f | 303 | rthp = &rth->u.dst.dn_next; |
1da177e4 LT |
304 | } |
305 | ||
0c195c3f | 306 | rcu_assign_pointer(rt->u.dst.dn_next, dn_rt_hash_table[hash].chain); |
1da177e4 | 307 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt); |
429eb0fa | 308 | |
03f49f34 | 309 | dst_use(&rt->u.dst, now); |
1da177e4 LT |
310 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); |
311 | *rp = rt; | |
312 | return 0; | |
313 | } | |
314 | ||
315 | void dn_run_flush(unsigned long dummy) | |
316 | { | |
317 | int i; | |
318 | struct dn_route *rt, *next; | |
319 | ||
320 | for(i = 0; i < dn_rt_hash_mask; i++) { | |
321 | spin_lock_bh(&dn_rt_hash_table[i].lock); | |
322 | ||
323 | if ((rt = xchg(&dn_rt_hash_table[i].chain, NULL)) == NULL) | |
324 | goto nothing_to_declare; | |
325 | ||
326 | for(; rt; rt=next) { | |
0c195c3f ED |
327 | next = rt->u.dst.dn_next; |
328 | rt->u.dst.dn_next = NULL; | |
1da177e4 LT |
329 | dst_free((struct dst_entry *)rt); |
330 | } | |
331 | ||
332 | nothing_to_declare: | |
333 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
334 | } | |
335 | } | |
336 | ||
337 | static DEFINE_SPINLOCK(dn_rt_flush_lock); | |
338 | ||
339 | void dn_rt_cache_flush(int delay) | |
340 | { | |
341 | unsigned long now = jiffies; | |
342 | int user_mode = !in_interrupt(); | |
343 | ||
344 | if (delay < 0) | |
345 | delay = dn_rt_min_delay; | |
346 | ||
347 | spin_lock_bh(&dn_rt_flush_lock); | |
348 | ||
349 | if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) { | |
350 | long tmo = (long)(dn_rt_deadline - now); | |
351 | ||
352 | if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay) | |
353 | tmo = 0; | |
354 | ||
355 | if (delay > tmo) | |
356 | delay = tmo; | |
357 | } | |
358 | ||
359 | if (delay <= 0) { | |
360 | spin_unlock_bh(&dn_rt_flush_lock); | |
361 | dn_run_flush(0); | |
362 | return; | |
363 | } | |
364 | ||
365 | if (dn_rt_deadline == 0) | |
366 | dn_rt_deadline = now + dn_rt_max_delay; | |
367 | ||
368 | dn_rt_flush_timer.expires = now + delay; | |
369 | add_timer(&dn_rt_flush_timer); | |
370 | spin_unlock_bh(&dn_rt_flush_lock); | |
371 | } | |
372 | ||
373 | /** | |
374 | * dn_return_short - Return a short packet to its sender | |
375 | * @skb: The packet to return | |
376 | * | |
377 | */ | |
378 | static int dn_return_short(struct sk_buff *skb) | |
379 | { | |
380 | struct dn_skb_cb *cb; | |
381 | unsigned char *ptr; | |
c4ea94ab SW |
382 | __le16 *src; |
383 | __le16 *dst; | |
384 | __le16 tmp; | |
1da177e4 LT |
385 | |
386 | /* Add back headers */ | |
d56f90a7 | 387 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
388 | |
389 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) | |
390 | return NET_RX_DROP; | |
391 | ||
392 | cb = DN_SKB_CB(skb); | |
393 | /* Skip packet length and point to flags */ | |
394 | ptr = skb->data + 2; | |
395 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; | |
396 | ||
c4ea94ab | 397 | dst = (__le16 *)ptr; |
1da177e4 | 398 | ptr += 2; |
c4ea94ab | 399 | src = (__le16 *)ptr; |
1da177e4 LT |
400 | ptr += 2; |
401 | *ptr = 0; /* Zero hop count */ | |
402 | ||
403 | /* Swap source and destination */ | |
404 | tmp = *src; | |
405 | *src = *dst; | |
406 | *dst = tmp; | |
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 | { | |
467 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
468 | int err; | |
469 | ||
470 | if ((err = dn_route_input(skb)) == 0) | |
471 | return dst_input(skb); | |
472 | ||
473 | if (decnet_debug_level & 4) { | |
474 | char *devname = skb->dev ? skb->dev->name : "???"; | |
475 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
476 | printk(KERN_DEBUG | |
477 | "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 SW |
478 | (int)cb->rt_flags, devname, skb->len, |
479 | dn_ntohs(cb->src), dn_ntohs(cb->dst), | |
1da177e4 LT |
480 | err, skb->pkt_type); |
481 | } | |
482 | ||
483 | if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) { | |
484 | switch(cb->rt_flags & DN_RT_PKT_MSK) { | |
485 | case DN_RT_PKT_SHORT: | |
486 | return dn_return_short(skb); | |
487 | case DN_RT_PKT_LONG: | |
488 | return dn_return_long(skb); | |
489 | } | |
490 | } | |
491 | ||
492 | kfree_skb(skb); | |
493 | return NET_RX_DROP; | |
494 | } | |
495 | ||
496 | static int dn_route_rx_long(struct sk_buff *skb) | |
497 | { | |
498 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
499 | unsigned char *ptr = skb->data; | |
500 | ||
501 | if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */ | |
502 | goto drop_it; | |
503 | ||
504 | skb_pull(skb, 20); | |
badff6d0 | 505 | skb_reset_transport_header(skb); |
1da177e4 | 506 | |
429eb0fa YH |
507 | /* Destination info */ |
508 | ptr += 2; | |
c4ea94ab | 509 | cb->dst = dn_eth2dn(ptr); |
429eb0fa YH |
510 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
511 | goto drop_it; | |
512 | ptr += 6; | |
1da177e4 LT |
513 | |
514 | ||
429eb0fa YH |
515 | /* Source info */ |
516 | ptr += 2; | |
c4ea94ab | 517 | cb->src = dn_eth2dn(ptr); |
429eb0fa YH |
518 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
519 | goto drop_it; | |
520 | ptr += 6; | |
521 | /* Other junk */ | |
522 | ptr++; | |
523 | cb->hops = *ptr++; /* Visit Count */ | |
1da177e4 LT |
524 | |
525 | return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet); | |
526 | ||
527 | drop_it: | |
528 | kfree_skb(skb); | |
529 | return NET_RX_DROP; | |
530 | } | |
531 | ||
532 | ||
533 | ||
534 | static int dn_route_rx_short(struct sk_buff *skb) | |
535 | { | |
536 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
537 | unsigned char *ptr = skb->data; | |
538 | ||
539 | if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */ | |
540 | goto drop_it; | |
541 | ||
542 | skb_pull(skb, 5); | |
badff6d0 | 543 | skb_reset_transport_header(skb); |
1da177e4 | 544 | |
c4ea94ab | 545 | cb->dst = *(__le16 *)ptr; |
429eb0fa YH |
546 | ptr += 2; |
547 | cb->src = *(__le16 *)ptr; | |
548 | ptr += 2; | |
549 | cb->hops = *ptr & 0x3f; | |
1da177e4 LT |
550 | |
551 | return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet); | |
552 | ||
553 | drop_it: | |
429eb0fa YH |
554 | kfree_skb(skb); |
555 | return NET_RX_DROP; | |
1da177e4 LT |
556 | } |
557 | ||
558 | static int dn_route_discard(struct sk_buff *skb) | |
559 | { | |
560 | /* | |
561 | * I know we drop the packet here, but thats considered success in | |
562 | * this case | |
563 | */ | |
564 | kfree_skb(skb); | |
565 | return NET_RX_SUCCESS; | |
566 | } | |
567 | ||
568 | static int dn_route_ptp_hello(struct sk_buff *skb) | |
569 | { | |
570 | dn_dev_hello(skb); | |
571 | dn_neigh_pointopoint_hello(skb); | |
572 | return NET_RX_SUCCESS; | |
573 | } | |
574 | ||
f2ccd8fa | 575 | int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
576 | { |
577 | struct dn_skb_cb *cb; | |
578 | unsigned char flags = 0; | |
c4ea94ab | 579 | __u16 len = dn_ntohs(*(__le16 *)skb->data); |
1da177e4 LT |
580 | struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr; |
581 | unsigned char padlen = 0; | |
582 | ||
e730c155 EB |
583 | if (dev->nd_net != &init_net) |
584 | goto dump_it; | |
585 | ||
1da177e4 LT |
586 | if (dn == NULL) |
587 | goto dump_it; | |
588 | ||
589 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
590 | goto out; | |
591 | ||
592 | if (!pskb_may_pull(skb, 3)) | |
593 | goto dump_it; | |
594 | ||
595 | skb_pull(skb, 2); | |
596 | ||
597 | if (len > skb->len) | |
598 | goto dump_it; | |
599 | ||
600 | skb_trim(skb, len); | |
601 | ||
602 | flags = *skb->data; | |
603 | ||
604 | cb = DN_SKB_CB(skb); | |
605 | cb->stamp = jiffies; | |
606 | cb->iif = dev->ifindex; | |
607 | ||
608 | /* | |
609 | * If we have padding, remove it. | |
610 | */ | |
611 | if (flags & DN_RT_F_PF) { | |
612 | padlen = flags & ~DN_RT_F_PF; | |
613 | if (!pskb_may_pull(skb, padlen + 1)) | |
614 | goto dump_it; | |
615 | skb_pull(skb, padlen); | |
616 | flags = *skb->data; | |
617 | } | |
618 | ||
c1d2bbe1 | 619 | skb_reset_network_header(skb); |
1da177e4 LT |
620 | |
621 | /* | |
622 | * Weed out future version DECnet | |
623 | */ | |
624 | if (flags & DN_RT_F_VER) | |
625 | goto dump_it; | |
626 | ||
627 | cb->rt_flags = flags; | |
628 | ||
629 | if (decnet_debug_level & 1) | |
429eb0fa | 630 | printk(KERN_DEBUG |
1da177e4 | 631 | "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n", |
429eb0fa | 632 | (int)flags, (dev) ? dev->name : "???", len, skb->len, |
1da177e4 LT |
633 | padlen); |
634 | ||
429eb0fa | 635 | if (flags & DN_RT_PKT_CNTL) { |
364c6bad | 636 | if (unlikely(skb_linearize(skb))) |
1da177e4 LT |
637 | goto dump_it; |
638 | ||
429eb0fa YH |
639 | switch(flags & DN_RT_CNTL_MSK) { |
640 | case DN_RT_PKT_INIT: | |
1da177e4 LT |
641 | dn_dev_init_pkt(skb); |
642 | break; | |
429eb0fa | 643 | case DN_RT_PKT_VERI: |
1da177e4 LT |
644 | dn_dev_veri_pkt(skb); |
645 | break; | |
646 | } | |
647 | ||
648 | if (dn->parms.state != DN_DEV_S_RU) | |
649 | goto dump_it; | |
650 | ||
651 | switch(flags & DN_RT_CNTL_MSK) { | |
429eb0fa | 652 | case DN_RT_PKT_HELO: |
1da177e4 LT |
653 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_route_ptp_hello); |
654 | ||
429eb0fa YH |
655 | case DN_RT_PKT_L1RT: |
656 | case DN_RT_PKT_L2RT: | |
657 | return NF_HOOK(PF_DECnet, NF_DN_ROUTE, skb, skb->dev, NULL, dn_route_discard); | |
658 | case DN_RT_PKT_ERTH: | |
1da177e4 LT |
659 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_router_hello); |
660 | ||
429eb0fa | 661 | case DN_RT_PKT_EEDH: |
1da177e4 | 662 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_endnode_hello); |
429eb0fa YH |
663 | } |
664 | } else { | |
1da177e4 LT |
665 | if (dn->parms.state != DN_DEV_S_RU) |
666 | goto dump_it; | |
667 | ||
668 | skb_pull(skb, 1); /* Pull flags */ | |
669 | ||
429eb0fa YH |
670 | switch(flags & DN_RT_PKT_MSK) { |
671 | case DN_RT_PKT_LONG: | |
672 | return dn_route_rx_long(skb); | |
673 | case DN_RT_PKT_SHORT: | |
674 | return dn_route_rx_short(skb); | |
1da177e4 | 675 | } |
429eb0fa | 676 | } |
1da177e4 LT |
677 | |
678 | dump_it: | |
679 | kfree_skb(skb); | |
680 | out: | |
681 | return NET_RX_DROP; | |
682 | } | |
683 | ||
684 | static int dn_output(struct sk_buff *skb) | |
685 | { | |
686 | struct dst_entry *dst = skb->dst; | |
687 | struct dn_route *rt = (struct dn_route *)dst; | |
688 | struct net_device *dev = dst->dev; | |
689 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
690 | struct neighbour *neigh; | |
691 | ||
692 | int err = -EINVAL; | |
693 | ||
694 | if ((neigh = dst->neighbour) == NULL) | |
695 | goto error; | |
696 | ||
697 | skb->dev = dev; | |
698 | ||
699 | cb->src = rt->rt_saddr; | |
700 | cb->dst = rt->rt_daddr; | |
701 | ||
702 | /* | |
703 | * Always set the Intra-Ethernet bit on all outgoing packets | |
704 | * originated on this node. Only valid flag from upper layers | |
705 | * is return-to-sender-requested. Set hop count to 0 too. | |
706 | */ | |
707 | cb->rt_flags &= ~DN_RT_F_RQR; | |
708 | cb->rt_flags |= DN_RT_F_IE; | |
709 | cb->hops = 0; | |
710 | ||
711 | return NF_HOOK(PF_DECnet, NF_DN_LOCAL_OUT, skb, NULL, dev, neigh->output); | |
712 | ||
713 | error: | |
714 | if (net_ratelimit()) | |
715 | printk(KERN_DEBUG "dn_output: This should not happen\n"); | |
716 | ||
717 | kfree_skb(skb); | |
718 | ||
719 | return err; | |
720 | } | |
721 | ||
722 | static int dn_forward(struct sk_buff *skb) | |
723 | { | |
724 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
725 | struct dst_entry *dst = skb->dst; | |
726 | struct dn_dev *dn_db = dst->dev->dn_ptr; | |
727 | struct dn_route *rt; | |
728 | struct neighbour *neigh = dst->neighbour; | |
729 | int header_len; | |
730 | #ifdef CONFIG_NETFILTER | |
731 | struct net_device *dev = skb->dev; | |
732 | #endif | |
733 | ||
734 | if (skb->pkt_type != PACKET_HOST) | |
735 | goto drop; | |
736 | ||
737 | /* Ensure that we have enough space for headers */ | |
738 | rt = (struct dn_route *)skb->dst; | |
739 | header_len = dn_db->use_long ? 21 : 6; | |
740 | if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+header_len)) | |
741 | goto drop; | |
742 | ||
743 | /* | |
744 | * Hop count exceeded. | |
745 | */ | |
746 | if (++cb->hops > 30) | |
747 | goto drop; | |
748 | ||
749 | skb->dev = rt->u.dst.dev; | |
750 | ||
751 | /* | |
752 | * If packet goes out same interface it came in on, then set | |
753 | * the Intra-Ethernet bit. This has no effect for short | |
754 | * packets, so we don't need to test for them here. | |
755 | */ | |
756 | cb->rt_flags &= ~DN_RT_F_IE; | |
757 | if (rt->rt_flags & RTCF_DOREDIRECT) | |
758 | cb->rt_flags |= DN_RT_F_IE; | |
759 | ||
760 | return NF_HOOK(PF_DECnet, NF_DN_FORWARD, skb, dev, skb->dev, neigh->output); | |
761 | ||
762 | drop: | |
763 | kfree_skb(skb); | |
764 | return NET_RX_DROP; | |
765 | } | |
766 | ||
767 | /* | |
768 | * Drop packet. This is used for endnodes and for | |
769 | * when we should not be forwarding packets from | |
770 | * this dest. | |
771 | */ | |
772 | static int dn_blackhole(struct sk_buff *skb) | |
773 | { | |
774 | kfree_skb(skb); | |
775 | return NET_RX_DROP; | |
776 | } | |
777 | ||
778 | /* | |
779 | * Used to catch bugs. This should never normally get | |
780 | * called. | |
781 | */ | |
782 | static int dn_rt_bug(struct sk_buff *skb) | |
783 | { | |
784 | if (net_ratelimit()) { | |
785 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
786 | ||
787 | printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n", | |
c4ea94ab | 788 | dn_ntohs(cb->src), dn_ntohs(cb->dst)); |
1da177e4 LT |
789 | } |
790 | ||
791 | kfree_skb(skb); | |
792 | ||
793 | return NET_RX_BAD; | |
794 | } | |
795 | ||
796 | static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res) | |
797 | { | |
798 | struct dn_fib_info *fi = res->fi; | |
799 | struct net_device *dev = rt->u.dst.dev; | |
800 | struct neighbour *n; | |
801 | unsigned mss; | |
802 | ||
803 | if (fi) { | |
804 | if (DN_FIB_RES_GW(*res) && | |
805 | DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
806 | rt->rt_gateway = DN_FIB_RES_GW(*res); | |
807 | memcpy(rt->u.dst.metrics, fi->fib_metrics, | |
808 | sizeof(rt->u.dst.metrics)); | |
809 | } | |
810 | rt->rt_type = res->type; | |
811 | ||
812 | if (dev != NULL && rt->u.dst.neighbour == NULL) { | |
813 | n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev); | |
814 | if (IS_ERR(n)) | |
815 | return PTR_ERR(n); | |
816 | rt->u.dst.neighbour = n; | |
817 | } | |
818 | ||
429eb0fa YH |
819 | if (rt->u.dst.metrics[RTAX_MTU-1] == 0 || |
820 | rt->u.dst.metrics[RTAX_MTU-1] > rt->u.dst.dev->mtu) | |
1da177e4 LT |
821 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; |
822 | mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->u.dst)); | |
823 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0 || | |
824 | rt->u.dst.metrics[RTAX_ADVMSS-1] > mss) | |
825 | rt->u.dst.metrics[RTAX_ADVMSS-1] = mss; | |
826 | return 0; | |
827 | } | |
828 | ||
c4ea94ab | 829 | static inline int dn_match_addr(__le16 addr1, __le16 addr2) |
1da177e4 LT |
830 | { |
831 | __u16 tmp = dn_ntohs(addr1) ^ dn_ntohs(addr2); | |
832 | int match = 16; | |
833 | while(tmp) { | |
834 | tmp >>= 1; | |
835 | match--; | |
836 | } | |
837 | return match; | |
838 | } | |
839 | ||
c4ea94ab | 840 | static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope) |
1da177e4 | 841 | { |
c4ea94ab | 842 | __le16 saddr = 0; |
1da177e4 LT |
843 | struct dn_dev *dn_db = dev->dn_ptr; |
844 | struct dn_ifaddr *ifa; | |
845 | int best_match = 0; | |
846 | int ret; | |
847 | ||
848 | read_lock(&dev_base_lock); | |
849 | for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) { | |
850 | if (ifa->ifa_scope > scope) | |
851 | continue; | |
852 | if (!daddr) { | |
853 | saddr = ifa->ifa_local; | |
854 | break; | |
855 | } | |
856 | ret = dn_match_addr(daddr, ifa->ifa_local); | |
857 | if (ret > best_match) | |
858 | saddr = ifa->ifa_local; | |
859 | if (best_match == 0) | |
860 | saddr = ifa->ifa_local; | |
861 | } | |
862 | read_unlock(&dev_base_lock); | |
863 | ||
864 | return saddr; | |
865 | } | |
866 | ||
c4ea94ab | 867 | static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res) |
1da177e4 LT |
868 | { |
869 | return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope); | |
870 | } | |
871 | ||
c4ea94ab | 872 | static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res) |
1da177e4 | 873 | { |
c4ea94ab | 874 | __le16 mask = dnet_make_mask(res->prefixlen); |
1da177e4 LT |
875 | return (daddr&~mask)|res->fi->fib_nh->nh_gw; |
876 | } | |
877 | ||
878 | static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard) | |
879 | { | |
429eb0fa | 880 | struct flowi fl = { .nl_u = { .dn_u = |
1da177e4 LT |
881 | { .daddr = oldflp->fld_dst, |
882 | .saddr = oldflp->fld_src, | |
883 | .scope = RT_SCOPE_UNIVERSE, | |
1da177e4 | 884 | } }, |
47dcf0cb | 885 | .mark = oldflp->mark, |
2774c7ab | 886 | .iif = init_net.loopback_dev->ifindex, |
1da177e4 LT |
887 | .oif = oldflp->oif }; |
888 | struct dn_route *rt = NULL; | |
7562f876 | 889 | struct net_device *dev_out = NULL, *dev; |
1da177e4 LT |
890 | struct neighbour *neigh = NULL; |
891 | unsigned hash; | |
892 | unsigned flags = 0; | |
893 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST }; | |
894 | int err; | |
895 | int free_res = 0; | |
c4ea94ab | 896 | __le16 gateway = 0; |
1da177e4 LT |
897 | |
898 | if (decnet_debug_level & 16) | |
899 | printk(KERN_DEBUG | |
900 | "dn_route_output_slow: dst=%04x src=%04x mark=%d" | |
c4ea94ab SW |
901 | " iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst), |
902 | dn_ntohs(oldflp->fld_src), | |
2774c7ab | 903 | oldflp->mark, init_net.loopback_dev->ifindex, oldflp->oif); |
1da177e4 LT |
904 | |
905 | /* If we have an output interface, verify its a DECnet device */ | |
906 | if (oldflp->oif) { | |
881d966b | 907 | dev_out = dev_get_by_index(&init_net, oldflp->oif); |
1da177e4 LT |
908 | err = -ENODEV; |
909 | if (dev_out && dev_out->dn_ptr == NULL) { | |
910 | dev_put(dev_out); | |
911 | dev_out = NULL; | |
912 | } | |
913 | if (dev_out == NULL) | |
914 | goto out; | |
915 | } | |
916 | ||
917 | /* If we have a source address, verify that its a local address */ | |
918 | if (oldflp->fld_src) { | |
919 | err = -EADDRNOTAVAIL; | |
920 | ||
921 | if (dev_out) { | |
922 | if (dn_dev_islocal(dev_out, oldflp->fld_src)) | |
923 | goto source_ok; | |
924 | dev_put(dev_out); | |
925 | goto out; | |
926 | } | |
927 | read_lock(&dev_base_lock); | |
881d966b | 928 | for_each_netdev(&init_net, dev) { |
7562f876 | 929 | if (!dev->dn_ptr) |
1da177e4 | 930 | continue; |
7562f876 | 931 | if (!dn_dev_islocal(dev, oldflp->fld_src)) |
9bbf28a1 | 932 | continue; |
7562f876 | 933 | if ((dev->flags & IFF_LOOPBACK) && |
9bbf28a1 | 934 | oldflp->fld_dst && |
7562f876 | 935 | !dn_dev_islocal(dev, oldflp->fld_dst)) |
9bbf28a1 | 936 | continue; |
7562f876 PE |
937 | |
938 | dev_out = dev; | |
9bbf28a1 | 939 | break; |
1da177e4 LT |
940 | } |
941 | read_unlock(&dev_base_lock); | |
942 | if (dev_out == NULL) | |
943 | goto out; | |
944 | dev_hold(dev_out); | |
945 | source_ok: | |
946 | ; | |
947 | } | |
948 | ||
949 | /* No destination? Assume its local */ | |
950 | if (!fl.fld_dst) { | |
951 | fl.fld_dst = fl.fld_src; | |
952 | ||
953 | err = -EADDRNOTAVAIL; | |
954 | if (dev_out) | |
955 | dev_put(dev_out); | |
2774c7ab | 956 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
957 | dev_hold(dev_out); |
958 | if (!fl.fld_dst) { | |
959 | fl.fld_dst = | |
960 | fl.fld_src = dnet_select_source(dev_out, 0, | |
961 | RT_SCOPE_HOST); | |
962 | if (!fl.fld_dst) | |
963 | goto out; | |
964 | } | |
2774c7ab | 965 | fl.oif = init_net.loopback_dev->ifindex; |
1da177e4 LT |
966 | res.type = RTN_LOCAL; |
967 | goto make_route; | |
968 | } | |
969 | ||
970 | if (decnet_debug_level & 16) | |
971 | printk(KERN_DEBUG | |
972 | "dn_route_output_slow: initial checks complete." | |
c4ea94ab SW |
973 | " dst=%o4x src=%04x oif=%d try_hard=%d\n", |
974 | dn_ntohs(fl.fld_dst), dn_ntohs(fl.fld_src), | |
975 | fl.oif, try_hard); | |
1da177e4 LT |
976 | |
977 | /* | |
978 | * N.B. If the kernel is compiled without router support then | |
979 | * dn_fib_lookup() will evaluate to non-zero so this if () block | |
980 | * will always be executed. | |
981 | */ | |
982 | err = -ESRCH; | |
983 | if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) { | |
984 | struct dn_dev *dn_db; | |
985 | if (err != -ESRCH) | |
986 | goto out; | |
987 | /* | |
429eb0fa | 988 | * Here the fallback is basically the standard algorithm for |
1da177e4 LT |
989 | * routing in endnodes which is described in the DECnet routing |
990 | * docs | |
991 | * | |
992 | * If we are not trying hard, look in neighbour cache. | |
993 | * The result is tested to ensure that if a specific output | |
429eb0fa | 994 | * device/source address was requested, then we honour that |
1da177e4 LT |
995 | * here |
996 | */ | |
997 | if (!try_hard) { | |
998 | neigh = neigh_lookup_nodev(&dn_neigh_table, &fl.fld_dst); | |
999 | if (neigh) { | |
429eb0fa | 1000 | if ((oldflp->oif && |
1da177e4 LT |
1001 | (neigh->dev->ifindex != oldflp->oif)) || |
1002 | (oldflp->fld_src && | |
1003 | (!dn_dev_islocal(neigh->dev, | |
1004 | oldflp->fld_src)))) { | |
1005 | neigh_release(neigh); | |
1006 | neigh = NULL; | |
1007 | } else { | |
1008 | if (dev_out) | |
1009 | dev_put(dev_out); | |
1010 | if (dn_dev_islocal(neigh->dev, fl.fld_dst)) { | |
2774c7ab | 1011 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1012 | res.type = RTN_LOCAL; |
1013 | } else { | |
1014 | dev_out = neigh->dev; | |
1015 | } | |
1016 | dev_hold(dev_out); | |
1017 | goto select_source; | |
1018 | } | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | /* Not there? Perhaps its a local address */ | |
1023 | if (dev_out == NULL) | |
1024 | dev_out = dn_dev_get_default(); | |
1025 | err = -ENODEV; | |
1026 | if (dev_out == NULL) | |
1027 | goto out; | |
1028 | dn_db = dev_out->dn_ptr; | |
1029 | /* Possible improvement - check all devices for local addr */ | |
1030 | if (dn_dev_islocal(dev_out, fl.fld_dst)) { | |
1031 | dev_put(dev_out); | |
2774c7ab | 1032 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1033 | dev_hold(dev_out); |
1034 | res.type = RTN_LOCAL; | |
1035 | goto select_source; | |
1036 | } | |
1037 | /* Not local either.... try sending it to the default router */ | |
1038 | neigh = neigh_clone(dn_db->router); | |
1039 | BUG_ON(neigh && neigh->dev != dev_out); | |
1040 | ||
1041 | /* Ok then, we assume its directly connected and move on */ | |
1042 | select_source: | |
1043 | if (neigh) | |
1044 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1045 | if (gateway == 0) | |
1046 | gateway = fl.fld_dst; | |
1047 | if (fl.fld_src == 0) { | |
1048 | fl.fld_src = dnet_select_source(dev_out, gateway, | |
1049 | res.type == RTN_LOCAL ? | |
429eb0fa | 1050 | RT_SCOPE_HOST : |
1da177e4 LT |
1051 | RT_SCOPE_LINK); |
1052 | if (fl.fld_src == 0 && res.type != RTN_LOCAL) | |
1053 | goto e_addr; | |
1054 | } | |
1055 | fl.oif = dev_out->ifindex; | |
1056 | goto make_route; | |
1057 | } | |
1058 | free_res = 1; | |
1059 | ||
1060 | if (res.type == RTN_NAT) | |
1061 | goto e_inval; | |
1062 | ||
1063 | if (res.type == RTN_LOCAL) { | |
1064 | if (!fl.fld_src) | |
1065 | fl.fld_src = fl.fld_dst; | |
1066 | if (dev_out) | |
1067 | dev_put(dev_out); | |
2774c7ab | 1068 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1069 | dev_hold(dev_out); |
1070 | fl.oif = dev_out->ifindex; | |
1071 | if (res.fi) | |
1072 | dn_fib_info_put(res.fi); | |
1073 | res.fi = NULL; | |
1074 | goto make_route; | |
1075 | } | |
1076 | ||
1077 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
1078 | dn_fib_select_multipath(&fl, &res); | |
1079 | ||
429eb0fa | 1080 | /* |
1da177e4 LT |
1081 | * We could add some logic to deal with default routes here and |
1082 | * get rid of some of the special casing above. | |
1083 | */ | |
1084 | ||
1085 | if (!fl.fld_src) | |
1086 | fl.fld_src = DN_FIB_RES_PREFSRC(res); | |
429eb0fa | 1087 | |
1da177e4 LT |
1088 | if (dev_out) |
1089 | dev_put(dev_out); | |
1090 | dev_out = DN_FIB_RES_DEV(res); | |
1091 | dev_hold(dev_out); | |
1092 | fl.oif = dev_out->ifindex; | |
1093 | gateway = DN_FIB_RES_GW(res); | |
1094 | ||
1095 | make_route: | |
1096 | if (dev_out->flags & IFF_LOOPBACK) | |
1097 | flags |= RTCF_LOCAL; | |
1098 | ||
1099 | rt = dst_alloc(&dn_dst_ops); | |
1100 | if (rt == NULL) | |
1101 | goto e_nobufs; | |
1102 | ||
1103 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1104 | rt->u.dst.flags = DST_HOST; | |
1105 | ||
1106 | rt->fl.fld_src = oldflp->fld_src; | |
1107 | rt->fl.fld_dst = oldflp->fld_dst; | |
1108 | rt->fl.oif = oldflp->oif; | |
1109 | rt->fl.iif = 0; | |
47dcf0cb | 1110 | rt->fl.mark = oldflp->mark; |
1da177e4 LT |
1111 | |
1112 | rt->rt_saddr = fl.fld_src; | |
1113 | rt->rt_daddr = fl.fld_dst; | |
1114 | rt->rt_gateway = gateway ? gateway : fl.fld_dst; | |
1115 | rt->rt_local_src = fl.fld_src; | |
1116 | ||
1117 | rt->rt_dst_map = fl.fld_dst; | |
1118 | rt->rt_src_map = fl.fld_src; | |
1119 | ||
1120 | rt->u.dst.dev = dev_out; | |
1121 | dev_hold(dev_out); | |
1122 | rt->u.dst.neighbour = neigh; | |
1123 | neigh = NULL; | |
1124 | ||
1125 | rt->u.dst.lastuse = jiffies; | |
1126 | rt->u.dst.output = dn_output; | |
1127 | rt->u.dst.input = dn_rt_bug; | |
1128 | rt->rt_flags = flags; | |
1129 | if (flags & RTCF_LOCAL) | |
1130 | rt->u.dst.input = dn_nsp_rx; | |
1131 | ||
1132 | err = dn_rt_set_next_hop(rt, &res); | |
1133 | if (err) | |
1134 | goto e_neighbour; | |
1135 | ||
1136 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); | |
1137 | dn_insert_route(rt, hash, (struct dn_route **)pprt); | |
1138 | ||
1139 | done: | |
1140 | if (neigh) | |
1141 | neigh_release(neigh); | |
1142 | if (free_res) | |
1143 | dn_fib_res_put(&res); | |
1144 | if (dev_out) | |
1145 | dev_put(dev_out); | |
1146 | out: | |
1147 | return err; | |
1148 | ||
1149 | e_addr: | |
429eb0fa YH |
1150 | err = -EADDRNOTAVAIL; |
1151 | goto done; | |
1da177e4 LT |
1152 | e_inval: |
1153 | err = -EINVAL; | |
1154 | goto done; | |
1155 | e_nobufs: | |
1156 | err = -ENOBUFS; | |
1157 | goto done; | |
1158 | e_neighbour: | |
1159 | dst_free(&rt->u.dst); | |
1160 | goto e_nobufs; | |
1161 | } | |
1162 | ||
1163 | ||
1164 | /* | |
1165 | * N.B. The flags may be moved into the flowi at some future stage. | |
1166 | */ | |
1167 | static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags) | |
1168 | { | |
1169 | unsigned hash = dn_hash(flp->fld_src, flp->fld_dst); | |
1170 | struct dn_route *rt = NULL; | |
1171 | ||
1172 | if (!(flags & MSG_TRYHARD)) { | |
1173 | rcu_read_lock_bh(); | |
1174 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt; | |
0c195c3f | 1175 | rt = rcu_dereference(rt->u.dst.dn_next)) { |
1da177e4 LT |
1176 | if ((flp->fld_dst == rt->fl.fld_dst) && |
1177 | (flp->fld_src == rt->fl.fld_src) && | |
47dcf0cb | 1178 | (flp->mark == rt->fl.mark) && |
1da177e4 LT |
1179 | (rt->fl.iif == 0) && |
1180 | (rt->fl.oif == flp->oif)) { | |
03f49f34 | 1181 | dst_use(&rt->u.dst, jiffies); |
1da177e4 LT |
1182 | rcu_read_unlock_bh(); |
1183 | *pprt = &rt->u.dst; | |
1184 | return 0; | |
1185 | } | |
1186 | } | |
1187 | rcu_read_unlock_bh(); | |
1188 | } | |
1189 | ||
1190 | return dn_route_output_slow(pprt, flp, flags); | |
1191 | } | |
1192 | ||
1193 | static int dn_route_output_key(struct dst_entry **pprt, struct flowi *flp, int flags) | |
1194 | { | |
1195 | int err; | |
1196 | ||
1197 | err = __dn_route_output_key(pprt, flp, flags); | |
1198 | if (err == 0 && flp->proto) { | |
1199 | err = xfrm_lookup(pprt, flp, NULL, 0); | |
1200 | } | |
1201 | return err; | |
1202 | } | |
1203 | ||
1204 | int dn_route_output_sock(struct dst_entry **pprt, struct flowi *fl, struct sock *sk, int flags) | |
1205 | { | |
1206 | int err; | |
1207 | ||
1208 | err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD); | |
1209 | if (err == 0 && fl->proto) { | |
1210 | err = xfrm_lookup(pprt, fl, sk, !(flags & MSG_DONTWAIT)); | |
1211 | } | |
1212 | return err; | |
1213 | } | |
1214 | ||
1215 | static int dn_route_input_slow(struct sk_buff *skb) | |
1216 | { | |
1217 | struct dn_route *rt = NULL; | |
1218 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1219 | struct net_device *in_dev = skb->dev; | |
1220 | struct net_device *out_dev = NULL; | |
1221 | struct dn_dev *dn_db; | |
1222 | struct neighbour *neigh = NULL; | |
1223 | unsigned hash; | |
1224 | int flags = 0; | |
c4ea94ab SW |
1225 | __le16 gateway = 0; |
1226 | __le16 local_src = 0; | |
429eb0fa | 1227 | struct flowi fl = { .nl_u = { .dn_u = |
1da177e4 LT |
1228 | { .daddr = cb->dst, |
1229 | .saddr = cb->src, | |
1230 | .scope = RT_SCOPE_UNIVERSE, | |
1da177e4 | 1231 | } }, |
47dcf0cb | 1232 | .mark = skb->mark, |
1da177e4 LT |
1233 | .iif = skb->dev->ifindex }; |
1234 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE }; | |
1235 | int err = -EINVAL; | |
1236 | int free_res = 0; | |
1237 | ||
1238 | dev_hold(in_dev); | |
1239 | ||
1240 | if ((dn_db = in_dev->dn_ptr) == NULL) | |
1241 | goto out; | |
1242 | ||
1243 | /* Zero source addresses are not allowed */ | |
1244 | if (fl.fld_src == 0) | |
1245 | goto out; | |
1246 | ||
1247 | /* | |
1248 | * In this case we've just received a packet from a source | |
1249 | * outside ourselves pretending to come from us. We don't | |
1250 | * allow it any further to prevent routing loops, spoofing and | |
1251 | * other nasties. Loopback packets already have the dst attached | |
1252 | * so this only affects packets which have originated elsewhere. | |
1253 | */ | |
1254 | err = -ENOTUNIQ; | |
1255 | if (dn_dev_islocal(in_dev, cb->src)) | |
1256 | goto out; | |
1257 | ||
1258 | err = dn_fib_lookup(&fl, &res); | |
1259 | if (err) { | |
1260 | if (err != -ESRCH) | |
1261 | goto out; | |
1262 | /* | |
1263 | * Is the destination us ? | |
1264 | */ | |
1265 | if (!dn_dev_islocal(in_dev, cb->dst)) | |
1266 | goto e_inval; | |
1267 | ||
1268 | res.type = RTN_LOCAL; | |
1da177e4 | 1269 | } else { |
c4ea94ab | 1270 | __le16 src_map = fl.fld_src; |
1da177e4 LT |
1271 | free_res = 1; |
1272 | ||
1273 | out_dev = DN_FIB_RES_DEV(res); | |
1274 | if (out_dev == NULL) { | |
1275 | if (net_ratelimit()) | |
1276 | printk(KERN_CRIT "Bug in dn_route_input_slow() " | |
1277 | "No output device\n"); | |
1278 | goto e_inval; | |
1279 | } | |
1280 | dev_hold(out_dev); | |
1281 | ||
1282 | if (res.r) | |
a8731cbf | 1283 | src_map = fl.fld_src; /* no NAT support for now */ |
1da177e4 LT |
1284 | |
1285 | gateway = DN_FIB_RES_GW(res); | |
1286 | if (res.type == RTN_NAT) { | |
1287 | fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res); | |
1288 | dn_fib_res_put(&res); | |
1289 | free_res = 0; | |
1290 | if (dn_fib_lookup(&fl, &res)) | |
1291 | goto e_inval; | |
1292 | free_res = 1; | |
1293 | if (res.type != RTN_UNICAST) | |
1294 | goto e_inval; | |
1295 | flags |= RTCF_DNAT; | |
1296 | gateway = fl.fld_dst; | |
1297 | } | |
1298 | fl.fld_src = src_map; | |
1299 | } | |
1300 | ||
1301 | switch(res.type) { | |
1302 | case RTN_UNICAST: | |
1303 | /* | |
1304 | * Forwarding check here, we only check for forwarding | |
1305 | * being turned off, if you want to only forward intra | |
1306 | * area, its up to you to set the routing tables up | |
1307 | * correctly. | |
1308 | */ | |
1309 | if (dn_db->parms.forwarding == 0) | |
1310 | goto e_inval; | |
1311 | ||
1312 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
1313 | dn_fib_select_multipath(&fl, &res); | |
1314 | ||
429eb0fa | 1315 | /* |
1da177e4 LT |
1316 | * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT |
1317 | * flag as a hint to set the intra-ethernet bit when | |
1318 | * forwarding. If we've got NAT in operation, we don't do | |
1319 | * this optimisation. | |
1320 | */ | |
1321 | if (out_dev == in_dev && !(flags & RTCF_NAT)) | |
1322 | flags |= RTCF_DOREDIRECT; | |
1323 | ||
1324 | local_src = DN_FIB_RES_PREFSRC(res); | |
1325 | ||
1326 | case RTN_BLACKHOLE: | |
1327 | case RTN_UNREACHABLE: | |
1328 | break; | |
1329 | case RTN_LOCAL: | |
1330 | flags |= RTCF_LOCAL; | |
1331 | fl.fld_src = cb->dst; | |
1332 | fl.fld_dst = cb->src; | |
1333 | ||
1334 | /* Routing tables gave us a gateway */ | |
1335 | if (gateway) | |
1336 | goto make_route; | |
1337 | ||
1338 | /* Packet was intra-ethernet, so we know its on-link */ | |
3a31b9d2 | 1339 | if (cb->rt_flags & DN_RT_F_IE) { |
1da177e4 LT |
1340 | gateway = cb->src; |
1341 | flags |= RTCF_DIRECTSRC; | |
1342 | goto make_route; | |
1343 | } | |
1344 | ||
1345 | /* Use the default router if there is one */ | |
1346 | neigh = neigh_clone(dn_db->router); | |
1347 | if (neigh) { | |
1348 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1349 | goto make_route; | |
1350 | } | |
1351 | ||
1352 | /* Close eyes and pray */ | |
1353 | gateway = cb->src; | |
1354 | flags |= RTCF_DIRECTSRC; | |
1355 | goto make_route; | |
1356 | default: | |
1357 | goto e_inval; | |
1358 | } | |
1359 | ||
1360 | make_route: | |
1361 | rt = dst_alloc(&dn_dst_ops); | |
1362 | if (rt == NULL) | |
1363 | goto e_nobufs; | |
1364 | ||
1365 | rt->rt_saddr = fl.fld_src; | |
1366 | rt->rt_daddr = fl.fld_dst; | |
1367 | rt->rt_gateway = fl.fld_dst; | |
1368 | if (gateway) | |
1369 | rt->rt_gateway = gateway; | |
1370 | rt->rt_local_src = local_src ? local_src : rt->rt_saddr; | |
1371 | ||
1372 | rt->rt_dst_map = fl.fld_dst; | |
1373 | rt->rt_src_map = fl.fld_src; | |
1374 | ||
1375 | rt->fl.fld_src = cb->src; | |
1376 | rt->fl.fld_dst = cb->dst; | |
1377 | rt->fl.oif = 0; | |
1378 | rt->fl.iif = in_dev->ifindex; | |
47dcf0cb | 1379 | rt->fl.mark = fl.mark; |
1da177e4 LT |
1380 | |
1381 | rt->u.dst.flags = DST_HOST; | |
1382 | rt->u.dst.neighbour = neigh; | |
1383 | rt->u.dst.dev = out_dev; | |
1384 | rt->u.dst.lastuse = jiffies; | |
1385 | rt->u.dst.output = dn_rt_bug; | |
1386 | switch(res.type) { | |
1387 | case RTN_UNICAST: | |
1388 | rt->u.dst.input = dn_forward; | |
1389 | break; | |
1390 | case RTN_LOCAL: | |
1391 | rt->u.dst.output = dn_output; | |
1392 | rt->u.dst.input = dn_nsp_rx; | |
1393 | rt->u.dst.dev = in_dev; | |
1394 | flags |= RTCF_LOCAL; | |
1395 | break; | |
1396 | default: | |
1397 | case RTN_UNREACHABLE: | |
1398 | case RTN_BLACKHOLE: | |
1399 | rt->u.dst.input = dn_blackhole; | |
1400 | } | |
1401 | rt->rt_flags = flags; | |
1402 | if (rt->u.dst.dev) | |
1403 | dev_hold(rt->u.dst.dev); | |
1404 | ||
1405 | err = dn_rt_set_next_hop(rt, &res); | |
1406 | if (err) | |
1407 | goto e_neighbour; | |
1408 | ||
1409 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); | |
1410 | dn_insert_route(rt, hash, (struct dn_route **)&skb->dst); | |
1411 | ||
1412 | done: | |
1413 | if (neigh) | |
1414 | neigh_release(neigh); | |
1415 | if (free_res) | |
1416 | dn_fib_res_put(&res); | |
1417 | dev_put(in_dev); | |
1418 | if (out_dev) | |
1419 | dev_put(out_dev); | |
1420 | out: | |
1421 | return err; | |
1422 | ||
1423 | e_inval: | |
1424 | err = -EINVAL; | |
1425 | goto done; | |
1426 | ||
1427 | e_nobufs: | |
1428 | err = -ENOBUFS; | |
1429 | goto done; | |
1430 | ||
1431 | e_neighbour: | |
1432 | dst_free(&rt->u.dst); | |
1433 | goto done; | |
1434 | } | |
1435 | ||
1436 | int dn_route_input(struct sk_buff *skb) | |
1437 | { | |
1438 | struct dn_route *rt; | |
1439 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1440 | unsigned hash = dn_hash(cb->src, cb->dst); | |
1441 | ||
1442 | if (skb->dst) | |
1443 | return 0; | |
1444 | ||
1445 | rcu_read_lock(); | |
1446 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL; | |
0c195c3f | 1447 | rt = rcu_dereference(rt->u.dst.dn_next)) { |
1da177e4 | 1448 | if ((rt->fl.fld_src == cb->src) && |
429eb0fa | 1449 | (rt->fl.fld_dst == cb->dst) && |
1da177e4 | 1450 | (rt->fl.oif == 0) && |
47dcf0cb | 1451 | (rt->fl.mark == skb->mark) && |
1da177e4 | 1452 | (rt->fl.iif == cb->iif)) { |
03f49f34 | 1453 | dst_use(&rt->u.dst, jiffies); |
1da177e4 LT |
1454 | rcu_read_unlock(); |
1455 | skb->dst = (struct dst_entry *)rt; | |
1456 | return 0; | |
1457 | } | |
1458 | } | |
1459 | rcu_read_unlock(); | |
1460 | ||
1461 | return dn_route_input_slow(skb); | |
1462 | } | |
1463 | ||
b6544c0b JHS |
1464 | static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
1465 | int event, int nowait, unsigned int flags) | |
1da177e4 LT |
1466 | { |
1467 | struct dn_route *rt = (struct dn_route *)skb->dst; | |
1468 | struct rtmsg *r; | |
1469 | struct nlmsghdr *nlh; | |
27a884dc | 1470 | unsigned char *b = skb_tail_pointer(skb); |
e3703b3d | 1471 | long expires; |
1da177e4 | 1472 | |
b6544c0b | 1473 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); |
1da177e4 | 1474 | r = NLMSG_DATA(nlh); |
1da177e4 LT |
1475 | r->rtm_family = AF_DECnet; |
1476 | r->rtm_dst_len = 16; | |
1477 | r->rtm_src_len = 0; | |
1478 | r->rtm_tos = 0; | |
1479 | r->rtm_table = RT_TABLE_MAIN; | |
9e762a4a | 1480 | RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1da177e4 LT |
1481 | r->rtm_type = rt->rt_type; |
1482 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
1483 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
1484 | r->rtm_protocol = RTPROT_UNSPEC; | |
1485 | if (rt->rt_flags & RTCF_NOTIFY) | |
1486 | r->rtm_flags |= RTM_F_NOTIFY; | |
1487 | RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr); | |
1488 | if (rt->fl.fld_src) { | |
1489 | r->rtm_src_len = 16; | |
1490 | RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src); | |
1491 | } | |
1492 | if (rt->u.dst.dev) | |
1493 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex); | |
1494 | /* | |
1495 | * Note to self - change this if input routes reverse direction when | |
1496 | * they deal only with inputs and not with replies like they do | |
1497 | * currently. | |
1498 | */ | |
1499 | RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src); | |
1500 | if (rt->rt_daddr != rt->rt_gateway) | |
1501 | RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway); | |
1502 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) | |
1503 | goto rtattr_failure; | |
e3703b3d TG |
1504 | expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0; |
1505 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, expires, | |
1506 | rt->u.dst.error) < 0) | |
1507 | goto rtattr_failure; | |
1da177e4 LT |
1508 | if (rt->fl.iif) |
1509 | RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif); | |
1510 | ||
27a884dc | 1511 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1512 | return skb->len; |
1513 | ||
1514 | nlmsg_failure: | |
1515 | rtattr_failure: | |
dc5fc579 | 1516 | nlmsg_trim(skb, b); |
429eb0fa | 1517 | return -1; |
1da177e4 LT |
1518 | } |
1519 | ||
1520 | /* | |
1521 | * This is called by both endnodes and routers now. | |
1522 | */ | |
fa34ddd7 | 1523 | static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 LT |
1524 | { |
1525 | struct rtattr **rta = arg; | |
1526 | struct rtmsg *rtm = NLMSG_DATA(nlh); | |
1527 | struct dn_route *rt = NULL; | |
1528 | struct dn_skb_cb *cb; | |
1529 | int err; | |
1530 | struct sk_buff *skb; | |
1531 | struct flowi fl; | |
1532 | ||
1533 | memset(&fl, 0, sizeof(fl)); | |
1534 | fl.proto = DNPROTO_NSP; | |
1535 | ||
1536 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1537 | if (skb == NULL) | |
1538 | return -ENOBUFS; | |
459a98ed | 1539 | skb_reset_mac_header(skb); |
1da177e4 LT |
1540 | cb = DN_SKB_CB(skb); |
1541 | ||
1542 | if (rta[RTA_SRC-1]) | |
1543 | memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2); | |
1544 | if (rta[RTA_DST-1]) | |
1545 | memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2); | |
1546 | if (rta[RTA_IIF-1]) | |
1547 | memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); | |
1548 | ||
1549 | if (fl.iif) { | |
1550 | struct net_device *dev; | |
881d966b | 1551 | if ((dev = dev_get_by_index(&init_net, fl.iif)) == NULL) { |
1da177e4 LT |
1552 | kfree_skb(skb); |
1553 | return -ENODEV; | |
1554 | } | |
1555 | if (!dev->dn_ptr) { | |
1556 | dev_put(dev); | |
1557 | kfree_skb(skb); | |
1558 | return -ENODEV; | |
1559 | } | |
1560 | skb->protocol = __constant_htons(ETH_P_DNA_RT); | |
1561 | skb->dev = dev; | |
1562 | cb->src = fl.fld_src; | |
1563 | cb->dst = fl.fld_dst; | |
1564 | local_bh_disable(); | |
1565 | err = dn_route_input(skb); | |
1566 | local_bh_enable(); | |
1567 | memset(cb, 0, sizeof(struct dn_skb_cb)); | |
1568 | rt = (struct dn_route *)skb->dst; | |
1569 | if (!err && -rt->u.dst.error) | |
1570 | err = rt->u.dst.error; | |
1571 | } else { | |
1572 | int oif = 0; | |
1573 | if (rta[RTA_OIF - 1]) | |
1574 | memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int)); | |
1575 | fl.oif = oif; | |
1576 | err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0); | |
1577 | } | |
1578 | ||
1579 | if (skb->dev) | |
1580 | dev_put(skb->dev); | |
1581 | skb->dev = NULL; | |
1582 | if (err) | |
1583 | goto out_free; | |
1584 | skb->dst = &rt->u.dst; | |
1585 | if (rtm->rtm_flags & RTM_F_NOTIFY) | |
1586 | rt->rt_flags |= RTCF_NOTIFY; | |
1587 | ||
b6544c0b | 1588 | err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0); |
1da177e4 LT |
1589 | |
1590 | if (err == 0) | |
1591 | goto out_free; | |
1592 | if (err < 0) { | |
1593 | err = -EMSGSIZE; | |
1594 | goto out_free; | |
1595 | } | |
1596 | ||
2942e900 | 1597 | return rtnl_unicast(skb, NETLINK_CB(in_skb).pid); |
1da177e4 LT |
1598 | |
1599 | out_free: | |
1600 | kfree_skb(skb); | |
1601 | return err; | |
1602 | } | |
1603 | ||
1604 | /* | |
1605 | * For routers, this is called from dn_fib_dump, but for endnodes its | |
1606 | * called directly from the rtnetlink dispatch table. | |
1607 | */ | |
1608 | int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1609 | { | |
1610 | struct dn_route *rt; | |
1611 | int h, s_h; | |
1612 | int idx, s_idx; | |
1613 | ||
1614 | if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg)) | |
1615 | return -EINVAL; | |
1616 | if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)) | |
1617 | return 0; | |
1618 | ||
1619 | s_h = cb->args[0]; | |
1620 | s_idx = idx = cb->args[1]; | |
1621 | for(h = 0; h <= dn_rt_hash_mask; h++) { | |
1622 | if (h < s_h) | |
1623 | continue; | |
1624 | if (h > s_h) | |
1625 | s_idx = 0; | |
1626 | rcu_read_lock_bh(); | |
1627 | for(rt = rcu_dereference(dn_rt_hash_table[h].chain), idx = 0; | |
1628 | rt; | |
0c195c3f | 1629 | rt = rcu_dereference(rt->u.dst.dn_next), idx++) { |
1da177e4 LT |
1630 | if (idx < s_idx) |
1631 | continue; | |
1632 | skb->dst = dst_clone(&rt->u.dst); | |
1633 | if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
429eb0fa | 1634 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 1635 | 1, NLM_F_MULTI) <= 0) { |
1da177e4 LT |
1636 | dst_release(xchg(&skb->dst, NULL)); |
1637 | rcu_read_unlock_bh(); | |
1638 | goto done; | |
1639 | } | |
1640 | dst_release(xchg(&skb->dst, NULL)); | |
1641 | } | |
1642 | rcu_read_unlock_bh(); | |
1643 | } | |
1644 | ||
1645 | done: | |
1646 | cb->args[0] = h; | |
1647 | cb->args[1] = idx; | |
1648 | return skb->len; | |
1649 | } | |
1650 | ||
1651 | #ifdef CONFIG_PROC_FS | |
1652 | struct dn_rt_cache_iter_state { | |
1653 | int bucket; | |
1654 | }; | |
1655 | ||
1656 | static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq) | |
1657 | { | |
1658 | struct dn_route *rt = NULL; | |
1659 | struct dn_rt_cache_iter_state *s = seq->private; | |
1660 | ||
1661 | for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) { | |
1662 | rcu_read_lock_bh(); | |
1663 | rt = dn_rt_hash_table[s->bucket].chain; | |
1664 | if (rt) | |
1665 | break; | |
1666 | rcu_read_unlock_bh(); | |
1667 | } | |
0d89d794 | 1668 | return rcu_dereference(rt); |
1da177e4 LT |
1669 | } |
1670 | ||
1671 | static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt) | |
1672 | { | |
0d89d794 | 1673 | struct dn_rt_cache_iter_state *s = seq->private; |
1da177e4 | 1674 | |
0c195c3f | 1675 | rt = rt->u.dst.dn_next; |
1da177e4 LT |
1676 | while(!rt) { |
1677 | rcu_read_unlock_bh(); | |
1678 | if (--s->bucket < 0) | |
1679 | break; | |
1680 | rcu_read_lock_bh(); | |
1681 | rt = dn_rt_hash_table[s->bucket].chain; | |
1682 | } | |
0d89d794 | 1683 | return rcu_dereference(rt); |
1da177e4 LT |
1684 | } |
1685 | ||
1686 | static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
1687 | { | |
1688 | struct dn_route *rt = dn_rt_cache_get_first(seq); | |
1689 | ||
1690 | if (rt) { | |
1691 | while(*pos && (rt = dn_rt_cache_get_next(seq, rt))) | |
1692 | --*pos; | |
1693 | } | |
1694 | return *pos ? NULL : rt; | |
1695 | } | |
1696 | ||
1697 | static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1698 | { | |
1699 | struct dn_route *rt = dn_rt_cache_get_next(seq, v); | |
1700 | ++*pos; | |
1701 | return rt; | |
1702 | } | |
1703 | ||
1704 | static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v) | |
1705 | { | |
1706 | if (v) | |
1707 | rcu_read_unlock_bh(); | |
1708 | } | |
1709 | ||
1710 | static int dn_rt_cache_seq_show(struct seq_file *seq, void *v) | |
1711 | { | |
1712 | struct dn_route *rt = v; | |
1713 | char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN]; | |
1714 | ||
1715 | seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n", | |
1716 | rt->u.dst.dev ? rt->u.dst.dev->name : "*", | |
1717 | dn_addr2asc(dn_ntohs(rt->rt_daddr), buf1), | |
1718 | dn_addr2asc(dn_ntohs(rt->rt_saddr), buf2), | |
1719 | atomic_read(&rt->u.dst.__refcnt), | |
1720 | rt->u.dst.__use, | |
1721 | (int) dst_metric(&rt->u.dst, RTAX_RTT)); | |
1722 | return 0; | |
429eb0fa | 1723 | } |
1da177e4 | 1724 | |
56b3d975 | 1725 | static const struct seq_operations dn_rt_cache_seq_ops = { |
1da177e4 LT |
1726 | .start = dn_rt_cache_seq_start, |
1727 | .next = dn_rt_cache_seq_next, | |
1728 | .stop = dn_rt_cache_seq_stop, | |
1729 | .show = dn_rt_cache_seq_show, | |
1730 | }; | |
1731 | ||
1732 | static int dn_rt_cache_seq_open(struct inode *inode, struct file *file) | |
1733 | { | |
31164088 PE |
1734 | return seq_open_private(file, &dn_rt_cache_seq_ops, |
1735 | sizeof(struct dn_rt_cache_iter_state)); | |
1da177e4 LT |
1736 | } |
1737 | ||
9a32144e | 1738 | static const struct file_operations dn_rt_cache_seq_fops = { |
1da177e4 LT |
1739 | .owner = THIS_MODULE, |
1740 | .open = dn_rt_cache_seq_open, | |
1741 | .read = seq_read, | |
1742 | .llseek = seq_lseek, | |
1743 | .release = seq_release_private, | |
1744 | }; | |
1745 | ||
1746 | #endif /* CONFIG_PROC_FS */ | |
1747 | ||
1748 | void __init dn_route_init(void) | |
1749 | { | |
1750 | int i, goal, order; | |
1751 | ||
e5d679f3 AD |
1752 | dn_dst_ops.kmem_cachep = |
1753 | kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0, | |
20c2df83 | 1754 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
b24b8a24 | 1755 | setup_timer(&dn_route_timer, dn_dst_check_expire, 0); |
1da177e4 LT |
1756 | dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; |
1757 | add_timer(&dn_route_timer); | |
1758 | ||
1759 | goal = num_physpages >> (26 - PAGE_SHIFT); | |
1760 | ||
1761 | for(order = 0; (1UL << order) < goal; order++) | |
1762 | /* NOTHING */; | |
1763 | ||
429eb0fa YH |
1764 | /* |
1765 | * Only want 1024 entries max, since the table is very, very unlikely | |
1766 | * to be larger than that. | |
1767 | */ | |
1768 | while(order && ((((1UL << order) * PAGE_SIZE) / | |
1769 | sizeof(struct dn_rt_hash_bucket)) >= 2048)) | |
1770 | order--; | |
1771 | ||
1772 | do { | |
1773 | dn_rt_hash_mask = (1UL << order) * PAGE_SIZE / | |
1774 | sizeof(struct dn_rt_hash_bucket); | |
1775 | while(dn_rt_hash_mask & (dn_rt_hash_mask - 1)) | |
1776 | dn_rt_hash_mask--; | |
1777 | dn_rt_hash_table = (struct dn_rt_hash_bucket *) | |
1778 | __get_free_pages(GFP_ATOMIC, order); | |
1779 | } while (dn_rt_hash_table == NULL && --order > 0); | |
1da177e4 LT |
1780 | |
1781 | if (!dn_rt_hash_table) | |
429eb0fa | 1782 | panic("Failed to allocate DECnet route cache hash table\n"); |
1da177e4 | 1783 | |
429eb0fa YH |
1784 | printk(KERN_INFO |
1785 | "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n", | |
1786 | dn_rt_hash_mask, | |
1da177e4 LT |
1787 | (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024); |
1788 | ||
1789 | dn_rt_hash_mask--; | |
429eb0fa YH |
1790 | for(i = 0; i <= dn_rt_hash_mask; i++) { |
1791 | spin_lock_init(&dn_rt_hash_table[i].lock); | |
1792 | dn_rt_hash_table[i].chain = NULL; | |
1793 | } | |
1da177e4 | 1794 | |
429eb0fa | 1795 | dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1); |
1da177e4 | 1796 | |
457c4cbc | 1797 | proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops); |
fa34ddd7 TG |
1798 | |
1799 | #ifdef CONFIG_DECNET_ROUTER | |
1800 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, dn_fib_dump); | |
1801 | #else | |
1802 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, | |
1803 | dn_cache_dump); | |
1804 | #endif | |
1da177e4 LT |
1805 | } |
1806 | ||
1807 | void __exit dn_route_cleanup(void) | |
1808 | { | |
1809 | del_timer(&dn_route_timer); | |
1810 | dn_run_flush(0); | |
1811 | ||
457c4cbc | 1812 | proc_net_remove(&init_net, "decnet_cache"); |
1da177e4 LT |
1813 | } |
1814 |