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 | ||
296 | rth->u.dst.__use++; | |
297 | dst_hold(&rth->u.dst); | |
298 | rth->u.dst.lastuse = now; | |
299 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); | |
300 | ||
301 | dnrt_drop(rt); | |
302 | *rp = rth; | |
303 | return 0; | |
304 | } | |
0c195c3f | 305 | rthp = &rth->u.dst.dn_next; |
1da177e4 LT |
306 | } |
307 | ||
0c195c3f | 308 | rcu_assign_pointer(rt->u.dst.dn_next, dn_rt_hash_table[hash].chain); |
1da177e4 | 309 | rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt); |
429eb0fa | 310 | |
1da177e4 LT |
311 | dst_hold(&rt->u.dst); |
312 | rt->u.dst.__use++; | |
313 | rt->u.dst.lastuse = now; | |
314 | spin_unlock_bh(&dn_rt_hash_table[hash].lock); | |
315 | *rp = rt; | |
316 | return 0; | |
317 | } | |
318 | ||
319 | void dn_run_flush(unsigned long dummy) | |
320 | { | |
321 | int i; | |
322 | struct dn_route *rt, *next; | |
323 | ||
324 | for(i = 0; i < dn_rt_hash_mask; i++) { | |
325 | spin_lock_bh(&dn_rt_hash_table[i].lock); | |
326 | ||
327 | if ((rt = xchg(&dn_rt_hash_table[i].chain, NULL)) == NULL) | |
328 | goto nothing_to_declare; | |
329 | ||
330 | for(; rt; rt=next) { | |
0c195c3f ED |
331 | next = rt->u.dst.dn_next; |
332 | rt->u.dst.dn_next = NULL; | |
1da177e4 LT |
333 | dst_free((struct dst_entry *)rt); |
334 | } | |
335 | ||
336 | nothing_to_declare: | |
337 | spin_unlock_bh(&dn_rt_hash_table[i].lock); | |
338 | } | |
339 | } | |
340 | ||
341 | static DEFINE_SPINLOCK(dn_rt_flush_lock); | |
342 | ||
343 | void dn_rt_cache_flush(int delay) | |
344 | { | |
345 | unsigned long now = jiffies; | |
346 | int user_mode = !in_interrupt(); | |
347 | ||
348 | if (delay < 0) | |
349 | delay = dn_rt_min_delay; | |
350 | ||
351 | spin_lock_bh(&dn_rt_flush_lock); | |
352 | ||
353 | if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) { | |
354 | long tmo = (long)(dn_rt_deadline - now); | |
355 | ||
356 | if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay) | |
357 | tmo = 0; | |
358 | ||
359 | if (delay > tmo) | |
360 | delay = tmo; | |
361 | } | |
362 | ||
363 | if (delay <= 0) { | |
364 | spin_unlock_bh(&dn_rt_flush_lock); | |
365 | dn_run_flush(0); | |
366 | return; | |
367 | } | |
368 | ||
369 | if (dn_rt_deadline == 0) | |
370 | dn_rt_deadline = now + dn_rt_max_delay; | |
371 | ||
372 | dn_rt_flush_timer.expires = now + delay; | |
373 | add_timer(&dn_rt_flush_timer); | |
374 | spin_unlock_bh(&dn_rt_flush_lock); | |
375 | } | |
376 | ||
377 | /** | |
378 | * dn_return_short - Return a short packet to its sender | |
379 | * @skb: The packet to return | |
380 | * | |
381 | */ | |
382 | static int dn_return_short(struct sk_buff *skb) | |
383 | { | |
384 | struct dn_skb_cb *cb; | |
385 | unsigned char *ptr; | |
c4ea94ab SW |
386 | __le16 *src; |
387 | __le16 *dst; | |
388 | __le16 tmp; | |
1da177e4 LT |
389 | |
390 | /* Add back headers */ | |
d56f90a7 | 391 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
392 | |
393 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) | |
394 | return NET_RX_DROP; | |
395 | ||
396 | cb = DN_SKB_CB(skb); | |
397 | /* Skip packet length and point to flags */ | |
398 | ptr = skb->data + 2; | |
399 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; | |
400 | ||
c4ea94ab | 401 | dst = (__le16 *)ptr; |
1da177e4 | 402 | ptr += 2; |
c4ea94ab | 403 | src = (__le16 *)ptr; |
1da177e4 LT |
404 | ptr += 2; |
405 | *ptr = 0; /* Zero hop count */ | |
406 | ||
407 | /* Swap source and destination */ | |
408 | tmp = *src; | |
409 | *src = *dst; | |
410 | *dst = tmp; | |
411 | ||
412 | skb->pkt_type = PACKET_OUTGOING; | |
413 | dn_rt_finish_output(skb, NULL, NULL); | |
414 | return NET_RX_SUCCESS; | |
415 | } | |
416 | ||
417 | /** | |
418 | * dn_return_long - Return a long packet to its sender | |
419 | * @skb: The long format packet to return | |
420 | * | |
421 | */ | |
422 | static int dn_return_long(struct sk_buff *skb) | |
423 | { | |
424 | struct dn_skb_cb *cb; | |
425 | unsigned char *ptr; | |
426 | unsigned char *src_addr, *dst_addr; | |
427 | unsigned char tmp[ETH_ALEN]; | |
428 | ||
429 | /* Add back all headers */ | |
d56f90a7 | 430 | skb_push(skb, skb->data - skb_network_header(skb)); |
1da177e4 LT |
431 | |
432 | if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL) | |
433 | return NET_RX_DROP; | |
434 | ||
435 | cb = DN_SKB_CB(skb); | |
436 | /* Ignore packet length and point to flags */ | |
437 | ptr = skb->data + 2; | |
438 | ||
439 | /* Skip padding */ | |
440 | if (*ptr & DN_RT_F_PF) { | |
441 | char padlen = (*ptr & ~DN_RT_F_PF); | |
442 | ptr += padlen; | |
443 | } | |
444 | ||
445 | *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS; | |
446 | ptr += 2; | |
447 | dst_addr = ptr; | |
448 | ptr += 8; | |
449 | src_addr = ptr; | |
450 | ptr += 6; | |
451 | *ptr = 0; /* Zero hop count */ | |
452 | ||
453 | /* Swap source and destination */ | |
454 | memcpy(tmp, src_addr, ETH_ALEN); | |
455 | memcpy(src_addr, dst_addr, ETH_ALEN); | |
456 | memcpy(dst_addr, tmp, ETH_ALEN); | |
457 | ||
458 | skb->pkt_type = PACKET_OUTGOING; | |
459 | dn_rt_finish_output(skb, dst_addr, src_addr); | |
460 | return NET_RX_SUCCESS; | |
461 | } | |
462 | ||
463 | /** | |
464 | * dn_route_rx_packet - Try and find a route for an incoming packet | |
465 | * @skb: The packet to find a route for | |
466 | * | |
467 | * Returns: result of input function if route is found, error code otherwise | |
468 | */ | |
469 | static int dn_route_rx_packet(struct sk_buff *skb) | |
470 | { | |
471 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
472 | int err; | |
473 | ||
474 | if ((err = dn_route_input(skb)) == 0) | |
475 | return dst_input(skb); | |
476 | ||
477 | if (decnet_debug_level & 4) { | |
478 | char *devname = skb->dev ? skb->dev->name : "???"; | |
479 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
480 | printk(KERN_DEBUG | |
481 | "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n", | |
c4ea94ab SW |
482 | (int)cb->rt_flags, devname, skb->len, |
483 | dn_ntohs(cb->src), dn_ntohs(cb->dst), | |
1da177e4 LT |
484 | err, skb->pkt_type); |
485 | } | |
486 | ||
487 | if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) { | |
488 | switch(cb->rt_flags & DN_RT_PKT_MSK) { | |
489 | case DN_RT_PKT_SHORT: | |
490 | return dn_return_short(skb); | |
491 | case DN_RT_PKT_LONG: | |
492 | return dn_return_long(skb); | |
493 | } | |
494 | } | |
495 | ||
496 | kfree_skb(skb); | |
497 | return NET_RX_DROP; | |
498 | } | |
499 | ||
500 | static int dn_route_rx_long(struct sk_buff *skb) | |
501 | { | |
502 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
503 | unsigned char *ptr = skb->data; | |
504 | ||
505 | if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */ | |
506 | goto drop_it; | |
507 | ||
508 | skb_pull(skb, 20); | |
badff6d0 | 509 | skb_reset_transport_header(skb); |
1da177e4 | 510 | |
429eb0fa YH |
511 | /* Destination info */ |
512 | ptr += 2; | |
c4ea94ab | 513 | cb->dst = dn_eth2dn(ptr); |
429eb0fa YH |
514 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
515 | goto drop_it; | |
516 | ptr += 6; | |
1da177e4 LT |
517 | |
518 | ||
429eb0fa YH |
519 | /* Source info */ |
520 | ptr += 2; | |
c4ea94ab | 521 | cb->src = dn_eth2dn(ptr); |
429eb0fa YH |
522 | if (memcmp(ptr, dn_hiord_addr, 4) != 0) |
523 | goto drop_it; | |
524 | ptr += 6; | |
525 | /* Other junk */ | |
526 | ptr++; | |
527 | cb->hops = *ptr++; /* Visit Count */ | |
1da177e4 LT |
528 | |
529 | return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet); | |
530 | ||
531 | drop_it: | |
532 | kfree_skb(skb); | |
533 | return NET_RX_DROP; | |
534 | } | |
535 | ||
536 | ||
537 | ||
538 | static int dn_route_rx_short(struct sk_buff *skb) | |
539 | { | |
540 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
541 | unsigned char *ptr = skb->data; | |
542 | ||
543 | if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */ | |
544 | goto drop_it; | |
545 | ||
546 | skb_pull(skb, 5); | |
badff6d0 | 547 | skb_reset_transport_header(skb); |
1da177e4 | 548 | |
c4ea94ab | 549 | cb->dst = *(__le16 *)ptr; |
429eb0fa YH |
550 | ptr += 2; |
551 | cb->src = *(__le16 *)ptr; | |
552 | ptr += 2; | |
553 | cb->hops = *ptr & 0x3f; | |
1da177e4 LT |
554 | |
555 | return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet); | |
556 | ||
557 | drop_it: | |
429eb0fa YH |
558 | kfree_skb(skb); |
559 | return NET_RX_DROP; | |
1da177e4 LT |
560 | } |
561 | ||
562 | static int dn_route_discard(struct sk_buff *skb) | |
563 | { | |
564 | /* | |
565 | * I know we drop the packet here, but thats considered success in | |
566 | * this case | |
567 | */ | |
568 | kfree_skb(skb); | |
569 | return NET_RX_SUCCESS; | |
570 | } | |
571 | ||
572 | static int dn_route_ptp_hello(struct sk_buff *skb) | |
573 | { | |
574 | dn_dev_hello(skb); | |
575 | dn_neigh_pointopoint_hello(skb); | |
576 | return NET_RX_SUCCESS; | |
577 | } | |
578 | ||
f2ccd8fa | 579 | int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
580 | { |
581 | struct dn_skb_cb *cb; | |
582 | unsigned char flags = 0; | |
c4ea94ab | 583 | __u16 len = dn_ntohs(*(__le16 *)skb->data); |
1da177e4 LT |
584 | struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr; |
585 | unsigned char padlen = 0; | |
586 | ||
e730c155 EB |
587 | if (dev->nd_net != &init_net) |
588 | goto dump_it; | |
589 | ||
1da177e4 LT |
590 | if (dn == NULL) |
591 | goto dump_it; | |
592 | ||
593 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
594 | goto out; | |
595 | ||
596 | if (!pskb_may_pull(skb, 3)) | |
597 | goto dump_it; | |
598 | ||
599 | skb_pull(skb, 2); | |
600 | ||
601 | if (len > skb->len) | |
602 | goto dump_it; | |
603 | ||
604 | skb_trim(skb, len); | |
605 | ||
606 | flags = *skb->data; | |
607 | ||
608 | cb = DN_SKB_CB(skb); | |
609 | cb->stamp = jiffies; | |
610 | cb->iif = dev->ifindex; | |
611 | ||
612 | /* | |
613 | * If we have padding, remove it. | |
614 | */ | |
615 | if (flags & DN_RT_F_PF) { | |
616 | padlen = flags & ~DN_RT_F_PF; | |
617 | if (!pskb_may_pull(skb, padlen + 1)) | |
618 | goto dump_it; | |
619 | skb_pull(skb, padlen); | |
620 | flags = *skb->data; | |
621 | } | |
622 | ||
c1d2bbe1 | 623 | skb_reset_network_header(skb); |
1da177e4 LT |
624 | |
625 | /* | |
626 | * Weed out future version DECnet | |
627 | */ | |
628 | if (flags & DN_RT_F_VER) | |
629 | goto dump_it; | |
630 | ||
631 | cb->rt_flags = flags; | |
632 | ||
633 | if (decnet_debug_level & 1) | |
429eb0fa | 634 | printk(KERN_DEBUG |
1da177e4 | 635 | "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n", |
429eb0fa | 636 | (int)flags, (dev) ? dev->name : "???", len, skb->len, |
1da177e4 LT |
637 | padlen); |
638 | ||
429eb0fa | 639 | if (flags & DN_RT_PKT_CNTL) { |
364c6bad | 640 | if (unlikely(skb_linearize(skb))) |
1da177e4 LT |
641 | goto dump_it; |
642 | ||
429eb0fa YH |
643 | switch(flags & DN_RT_CNTL_MSK) { |
644 | case DN_RT_PKT_INIT: | |
1da177e4 LT |
645 | dn_dev_init_pkt(skb); |
646 | break; | |
429eb0fa | 647 | case DN_RT_PKT_VERI: |
1da177e4 LT |
648 | dn_dev_veri_pkt(skb); |
649 | break; | |
650 | } | |
651 | ||
652 | if (dn->parms.state != DN_DEV_S_RU) | |
653 | goto dump_it; | |
654 | ||
655 | switch(flags & DN_RT_CNTL_MSK) { | |
429eb0fa | 656 | case DN_RT_PKT_HELO: |
1da177e4 LT |
657 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_route_ptp_hello); |
658 | ||
429eb0fa YH |
659 | case DN_RT_PKT_L1RT: |
660 | case DN_RT_PKT_L2RT: | |
661 | return NF_HOOK(PF_DECnet, NF_DN_ROUTE, skb, skb->dev, NULL, dn_route_discard); | |
662 | case DN_RT_PKT_ERTH: | |
1da177e4 LT |
663 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_router_hello); |
664 | ||
429eb0fa | 665 | case DN_RT_PKT_EEDH: |
1da177e4 | 666 | return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, 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 | { | |
690 | struct dst_entry *dst = skb->dst; | |
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 | ||
715 | return NF_HOOK(PF_DECnet, NF_DN_LOCAL_OUT, skb, NULL, dev, neigh->output); | |
716 | ||
717 | error: | |
718 | if (net_ratelimit()) | |
719 | printk(KERN_DEBUG "dn_output: This should not happen\n"); | |
720 | ||
721 | kfree_skb(skb); | |
722 | ||
723 | return err; | |
724 | } | |
725 | ||
726 | static int dn_forward(struct sk_buff *skb) | |
727 | { | |
728 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
729 | struct dst_entry *dst = skb->dst; | |
730 | struct dn_dev *dn_db = dst->dev->dn_ptr; | |
731 | struct dn_route *rt; | |
732 | struct neighbour *neigh = dst->neighbour; | |
733 | int header_len; | |
734 | #ifdef CONFIG_NETFILTER | |
735 | struct net_device *dev = skb->dev; | |
736 | #endif | |
737 | ||
738 | if (skb->pkt_type != PACKET_HOST) | |
739 | goto drop; | |
740 | ||
741 | /* Ensure that we have enough space for headers */ | |
742 | rt = (struct dn_route *)skb->dst; | |
743 | header_len = dn_db->use_long ? 21 : 6; | |
744 | if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+header_len)) | |
745 | goto drop; | |
746 | ||
747 | /* | |
748 | * Hop count exceeded. | |
749 | */ | |
750 | if (++cb->hops > 30) | |
751 | goto drop; | |
752 | ||
753 | skb->dev = rt->u.dst.dev; | |
754 | ||
755 | /* | |
756 | * If packet goes out same interface it came in on, then set | |
757 | * the Intra-Ethernet bit. This has no effect for short | |
758 | * packets, so we don't need to test for them here. | |
759 | */ | |
760 | cb->rt_flags &= ~DN_RT_F_IE; | |
761 | if (rt->rt_flags & RTCF_DOREDIRECT) | |
762 | cb->rt_flags |= DN_RT_F_IE; | |
763 | ||
764 | return NF_HOOK(PF_DECnet, NF_DN_FORWARD, skb, dev, skb->dev, neigh->output); | |
765 | ||
766 | drop: | |
767 | kfree_skb(skb); | |
768 | return NET_RX_DROP; | |
769 | } | |
770 | ||
771 | /* | |
772 | * Drop packet. This is used for endnodes and for | |
773 | * when we should not be forwarding packets from | |
774 | * this dest. | |
775 | */ | |
776 | static int dn_blackhole(struct sk_buff *skb) | |
777 | { | |
778 | kfree_skb(skb); | |
779 | return NET_RX_DROP; | |
780 | } | |
781 | ||
782 | /* | |
783 | * Used to catch bugs. This should never normally get | |
784 | * called. | |
785 | */ | |
786 | static int dn_rt_bug(struct sk_buff *skb) | |
787 | { | |
788 | if (net_ratelimit()) { | |
789 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
790 | ||
791 | printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n", | |
c4ea94ab | 792 | dn_ntohs(cb->src), dn_ntohs(cb->dst)); |
1da177e4 LT |
793 | } |
794 | ||
795 | kfree_skb(skb); | |
796 | ||
797 | return NET_RX_BAD; | |
798 | } | |
799 | ||
800 | static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res) | |
801 | { | |
802 | struct dn_fib_info *fi = res->fi; | |
803 | struct net_device *dev = rt->u.dst.dev; | |
804 | struct neighbour *n; | |
805 | unsigned mss; | |
806 | ||
807 | if (fi) { | |
808 | if (DN_FIB_RES_GW(*res) && | |
809 | DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) | |
810 | rt->rt_gateway = DN_FIB_RES_GW(*res); | |
811 | memcpy(rt->u.dst.metrics, fi->fib_metrics, | |
812 | sizeof(rt->u.dst.metrics)); | |
813 | } | |
814 | rt->rt_type = res->type; | |
815 | ||
816 | if (dev != NULL && rt->u.dst.neighbour == NULL) { | |
817 | n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev); | |
818 | if (IS_ERR(n)) | |
819 | return PTR_ERR(n); | |
820 | rt->u.dst.neighbour = n; | |
821 | } | |
822 | ||
429eb0fa YH |
823 | if (rt->u.dst.metrics[RTAX_MTU-1] == 0 || |
824 | rt->u.dst.metrics[RTAX_MTU-1] > rt->u.dst.dev->mtu) | |
1da177e4 LT |
825 | rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu; |
826 | mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->u.dst)); | |
827 | if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0 || | |
828 | rt->u.dst.metrics[RTAX_ADVMSS-1] > mss) | |
829 | rt->u.dst.metrics[RTAX_ADVMSS-1] = mss; | |
830 | return 0; | |
831 | } | |
832 | ||
c4ea94ab | 833 | static inline int dn_match_addr(__le16 addr1, __le16 addr2) |
1da177e4 LT |
834 | { |
835 | __u16 tmp = dn_ntohs(addr1) ^ dn_ntohs(addr2); | |
836 | int match = 16; | |
837 | while(tmp) { | |
838 | tmp >>= 1; | |
839 | match--; | |
840 | } | |
841 | return match; | |
842 | } | |
843 | ||
c4ea94ab | 844 | static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope) |
1da177e4 | 845 | { |
c4ea94ab | 846 | __le16 saddr = 0; |
1da177e4 LT |
847 | struct dn_dev *dn_db = dev->dn_ptr; |
848 | struct dn_ifaddr *ifa; | |
849 | int best_match = 0; | |
850 | int ret; | |
851 | ||
852 | read_lock(&dev_base_lock); | |
853 | for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) { | |
854 | if (ifa->ifa_scope > scope) | |
855 | continue; | |
856 | if (!daddr) { | |
857 | saddr = ifa->ifa_local; | |
858 | break; | |
859 | } | |
860 | ret = dn_match_addr(daddr, ifa->ifa_local); | |
861 | if (ret > best_match) | |
862 | saddr = ifa->ifa_local; | |
863 | if (best_match == 0) | |
864 | saddr = ifa->ifa_local; | |
865 | } | |
866 | read_unlock(&dev_base_lock); | |
867 | ||
868 | return saddr; | |
869 | } | |
870 | ||
c4ea94ab | 871 | static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res) |
1da177e4 LT |
872 | { |
873 | return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope); | |
874 | } | |
875 | ||
c4ea94ab | 876 | static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res) |
1da177e4 | 877 | { |
c4ea94ab | 878 | __le16 mask = dnet_make_mask(res->prefixlen); |
1da177e4 LT |
879 | return (daddr&~mask)|res->fi->fib_nh->nh_gw; |
880 | } | |
881 | ||
882 | static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard) | |
883 | { | |
429eb0fa | 884 | struct flowi fl = { .nl_u = { .dn_u = |
1da177e4 LT |
885 | { .daddr = oldflp->fld_dst, |
886 | .saddr = oldflp->fld_src, | |
887 | .scope = RT_SCOPE_UNIVERSE, | |
1da177e4 | 888 | } }, |
47dcf0cb | 889 | .mark = oldflp->mark, |
2774c7ab | 890 | .iif = init_net.loopback_dev->ifindex, |
1da177e4 LT |
891 | .oif = oldflp->oif }; |
892 | struct dn_route *rt = NULL; | |
7562f876 | 893 | struct net_device *dev_out = NULL, *dev; |
1da177e4 LT |
894 | struct neighbour *neigh = NULL; |
895 | unsigned hash; | |
896 | unsigned flags = 0; | |
897 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST }; | |
898 | int err; | |
899 | int free_res = 0; | |
c4ea94ab | 900 | __le16 gateway = 0; |
1da177e4 LT |
901 | |
902 | if (decnet_debug_level & 16) | |
903 | printk(KERN_DEBUG | |
904 | "dn_route_output_slow: dst=%04x src=%04x mark=%d" | |
c4ea94ab SW |
905 | " iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst), |
906 | dn_ntohs(oldflp->fld_src), | |
2774c7ab | 907 | oldflp->mark, init_net.loopback_dev->ifindex, oldflp->oif); |
1da177e4 LT |
908 | |
909 | /* If we have an output interface, verify its a DECnet device */ | |
910 | if (oldflp->oif) { | |
881d966b | 911 | dev_out = dev_get_by_index(&init_net, oldflp->oif); |
1da177e4 LT |
912 | err = -ENODEV; |
913 | if (dev_out && dev_out->dn_ptr == NULL) { | |
914 | dev_put(dev_out); | |
915 | dev_out = NULL; | |
916 | } | |
917 | if (dev_out == NULL) | |
918 | goto out; | |
919 | } | |
920 | ||
921 | /* If we have a source address, verify that its a local address */ | |
922 | if (oldflp->fld_src) { | |
923 | err = -EADDRNOTAVAIL; | |
924 | ||
925 | if (dev_out) { | |
926 | if (dn_dev_islocal(dev_out, oldflp->fld_src)) | |
927 | goto source_ok; | |
928 | dev_put(dev_out); | |
929 | goto out; | |
930 | } | |
931 | read_lock(&dev_base_lock); | |
881d966b | 932 | for_each_netdev(&init_net, dev) { |
7562f876 | 933 | if (!dev->dn_ptr) |
1da177e4 | 934 | continue; |
7562f876 | 935 | if (!dn_dev_islocal(dev, oldflp->fld_src)) |
9bbf28a1 | 936 | continue; |
7562f876 | 937 | if ((dev->flags & IFF_LOOPBACK) && |
9bbf28a1 | 938 | oldflp->fld_dst && |
7562f876 | 939 | !dn_dev_islocal(dev, oldflp->fld_dst)) |
9bbf28a1 | 940 | continue; |
7562f876 PE |
941 | |
942 | dev_out = dev; | |
9bbf28a1 | 943 | break; |
1da177e4 LT |
944 | } |
945 | read_unlock(&dev_base_lock); | |
946 | if (dev_out == NULL) | |
947 | goto out; | |
948 | dev_hold(dev_out); | |
949 | source_ok: | |
950 | ; | |
951 | } | |
952 | ||
953 | /* No destination? Assume its local */ | |
954 | if (!fl.fld_dst) { | |
955 | fl.fld_dst = fl.fld_src; | |
956 | ||
957 | err = -EADDRNOTAVAIL; | |
958 | if (dev_out) | |
959 | dev_put(dev_out); | |
2774c7ab | 960 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
961 | dev_hold(dev_out); |
962 | if (!fl.fld_dst) { | |
963 | fl.fld_dst = | |
964 | fl.fld_src = dnet_select_source(dev_out, 0, | |
965 | RT_SCOPE_HOST); | |
966 | if (!fl.fld_dst) | |
967 | goto out; | |
968 | } | |
2774c7ab | 969 | fl.oif = init_net.loopback_dev->ifindex; |
1da177e4 LT |
970 | res.type = RTN_LOCAL; |
971 | goto make_route; | |
972 | } | |
973 | ||
974 | if (decnet_debug_level & 16) | |
975 | printk(KERN_DEBUG | |
976 | "dn_route_output_slow: initial checks complete." | |
c4ea94ab SW |
977 | " dst=%o4x src=%04x oif=%d try_hard=%d\n", |
978 | dn_ntohs(fl.fld_dst), dn_ntohs(fl.fld_src), | |
979 | fl.oif, try_hard); | |
1da177e4 LT |
980 | |
981 | /* | |
982 | * N.B. If the kernel is compiled without router support then | |
983 | * dn_fib_lookup() will evaluate to non-zero so this if () block | |
984 | * will always be executed. | |
985 | */ | |
986 | err = -ESRCH; | |
987 | if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) { | |
988 | struct dn_dev *dn_db; | |
989 | if (err != -ESRCH) | |
990 | goto out; | |
991 | /* | |
429eb0fa | 992 | * Here the fallback is basically the standard algorithm for |
1da177e4 LT |
993 | * routing in endnodes which is described in the DECnet routing |
994 | * docs | |
995 | * | |
996 | * If we are not trying hard, look in neighbour cache. | |
997 | * The result is tested to ensure that if a specific output | |
429eb0fa | 998 | * device/source address was requested, then we honour that |
1da177e4 LT |
999 | * here |
1000 | */ | |
1001 | if (!try_hard) { | |
1002 | neigh = neigh_lookup_nodev(&dn_neigh_table, &fl.fld_dst); | |
1003 | if (neigh) { | |
429eb0fa | 1004 | if ((oldflp->oif && |
1da177e4 LT |
1005 | (neigh->dev->ifindex != oldflp->oif)) || |
1006 | (oldflp->fld_src && | |
1007 | (!dn_dev_islocal(neigh->dev, | |
1008 | oldflp->fld_src)))) { | |
1009 | neigh_release(neigh); | |
1010 | neigh = NULL; | |
1011 | } else { | |
1012 | if (dev_out) | |
1013 | dev_put(dev_out); | |
1014 | if (dn_dev_islocal(neigh->dev, fl.fld_dst)) { | |
2774c7ab | 1015 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1016 | res.type = RTN_LOCAL; |
1017 | } else { | |
1018 | dev_out = neigh->dev; | |
1019 | } | |
1020 | dev_hold(dev_out); | |
1021 | goto select_source; | |
1022 | } | |
1023 | } | |
1024 | } | |
1025 | ||
1026 | /* Not there? Perhaps its a local address */ | |
1027 | if (dev_out == NULL) | |
1028 | dev_out = dn_dev_get_default(); | |
1029 | err = -ENODEV; | |
1030 | if (dev_out == NULL) | |
1031 | goto out; | |
1032 | dn_db = dev_out->dn_ptr; | |
1033 | /* Possible improvement - check all devices for local addr */ | |
1034 | if (dn_dev_islocal(dev_out, fl.fld_dst)) { | |
1035 | dev_put(dev_out); | |
2774c7ab | 1036 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1037 | dev_hold(dev_out); |
1038 | res.type = RTN_LOCAL; | |
1039 | goto select_source; | |
1040 | } | |
1041 | /* Not local either.... try sending it to the default router */ | |
1042 | neigh = neigh_clone(dn_db->router); | |
1043 | BUG_ON(neigh && neigh->dev != dev_out); | |
1044 | ||
1045 | /* Ok then, we assume its directly connected and move on */ | |
1046 | select_source: | |
1047 | if (neigh) | |
1048 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1049 | if (gateway == 0) | |
1050 | gateway = fl.fld_dst; | |
1051 | if (fl.fld_src == 0) { | |
1052 | fl.fld_src = dnet_select_source(dev_out, gateway, | |
1053 | res.type == RTN_LOCAL ? | |
429eb0fa | 1054 | RT_SCOPE_HOST : |
1da177e4 LT |
1055 | RT_SCOPE_LINK); |
1056 | if (fl.fld_src == 0 && res.type != RTN_LOCAL) | |
1057 | goto e_addr; | |
1058 | } | |
1059 | fl.oif = dev_out->ifindex; | |
1060 | goto make_route; | |
1061 | } | |
1062 | free_res = 1; | |
1063 | ||
1064 | if (res.type == RTN_NAT) | |
1065 | goto e_inval; | |
1066 | ||
1067 | if (res.type == RTN_LOCAL) { | |
1068 | if (!fl.fld_src) | |
1069 | fl.fld_src = fl.fld_dst; | |
1070 | if (dev_out) | |
1071 | dev_put(dev_out); | |
2774c7ab | 1072 | dev_out = init_net.loopback_dev; |
1da177e4 LT |
1073 | dev_hold(dev_out); |
1074 | fl.oif = dev_out->ifindex; | |
1075 | if (res.fi) | |
1076 | dn_fib_info_put(res.fi); | |
1077 | res.fi = NULL; | |
1078 | goto make_route; | |
1079 | } | |
1080 | ||
1081 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
1082 | dn_fib_select_multipath(&fl, &res); | |
1083 | ||
429eb0fa | 1084 | /* |
1da177e4 LT |
1085 | * We could add some logic to deal with default routes here and |
1086 | * get rid of some of the special casing above. | |
1087 | */ | |
1088 | ||
1089 | if (!fl.fld_src) | |
1090 | fl.fld_src = DN_FIB_RES_PREFSRC(res); | |
429eb0fa | 1091 | |
1da177e4 LT |
1092 | if (dev_out) |
1093 | dev_put(dev_out); | |
1094 | dev_out = DN_FIB_RES_DEV(res); | |
1095 | dev_hold(dev_out); | |
1096 | fl.oif = dev_out->ifindex; | |
1097 | gateway = DN_FIB_RES_GW(res); | |
1098 | ||
1099 | make_route: | |
1100 | if (dev_out->flags & IFF_LOOPBACK) | |
1101 | flags |= RTCF_LOCAL; | |
1102 | ||
1103 | rt = dst_alloc(&dn_dst_ops); | |
1104 | if (rt == NULL) | |
1105 | goto e_nobufs; | |
1106 | ||
1107 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1108 | rt->u.dst.flags = DST_HOST; | |
1109 | ||
1110 | rt->fl.fld_src = oldflp->fld_src; | |
1111 | rt->fl.fld_dst = oldflp->fld_dst; | |
1112 | rt->fl.oif = oldflp->oif; | |
1113 | rt->fl.iif = 0; | |
47dcf0cb | 1114 | rt->fl.mark = oldflp->mark; |
1da177e4 LT |
1115 | |
1116 | rt->rt_saddr = fl.fld_src; | |
1117 | rt->rt_daddr = fl.fld_dst; | |
1118 | rt->rt_gateway = gateway ? gateway : fl.fld_dst; | |
1119 | rt->rt_local_src = fl.fld_src; | |
1120 | ||
1121 | rt->rt_dst_map = fl.fld_dst; | |
1122 | rt->rt_src_map = fl.fld_src; | |
1123 | ||
1124 | rt->u.dst.dev = dev_out; | |
1125 | dev_hold(dev_out); | |
1126 | rt->u.dst.neighbour = neigh; | |
1127 | neigh = NULL; | |
1128 | ||
1129 | rt->u.dst.lastuse = jiffies; | |
1130 | rt->u.dst.output = dn_output; | |
1131 | rt->u.dst.input = dn_rt_bug; | |
1132 | rt->rt_flags = flags; | |
1133 | if (flags & RTCF_LOCAL) | |
1134 | rt->u.dst.input = dn_nsp_rx; | |
1135 | ||
1136 | err = dn_rt_set_next_hop(rt, &res); | |
1137 | if (err) | |
1138 | goto e_neighbour; | |
1139 | ||
1140 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); | |
1141 | dn_insert_route(rt, hash, (struct dn_route **)pprt); | |
1142 | ||
1143 | done: | |
1144 | if (neigh) | |
1145 | neigh_release(neigh); | |
1146 | if (free_res) | |
1147 | dn_fib_res_put(&res); | |
1148 | if (dev_out) | |
1149 | dev_put(dev_out); | |
1150 | out: | |
1151 | return err; | |
1152 | ||
1153 | e_addr: | |
429eb0fa YH |
1154 | err = -EADDRNOTAVAIL; |
1155 | goto done; | |
1da177e4 LT |
1156 | e_inval: |
1157 | err = -EINVAL; | |
1158 | goto done; | |
1159 | e_nobufs: | |
1160 | err = -ENOBUFS; | |
1161 | goto done; | |
1162 | e_neighbour: | |
1163 | dst_free(&rt->u.dst); | |
1164 | goto e_nobufs; | |
1165 | } | |
1166 | ||
1167 | ||
1168 | /* | |
1169 | * N.B. The flags may be moved into the flowi at some future stage. | |
1170 | */ | |
1171 | static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags) | |
1172 | { | |
1173 | unsigned hash = dn_hash(flp->fld_src, flp->fld_dst); | |
1174 | struct dn_route *rt = NULL; | |
1175 | ||
1176 | if (!(flags & MSG_TRYHARD)) { | |
1177 | rcu_read_lock_bh(); | |
1178 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt; | |
0c195c3f | 1179 | rt = rcu_dereference(rt->u.dst.dn_next)) { |
1da177e4 LT |
1180 | if ((flp->fld_dst == rt->fl.fld_dst) && |
1181 | (flp->fld_src == rt->fl.fld_src) && | |
47dcf0cb | 1182 | (flp->mark == rt->fl.mark) && |
1da177e4 LT |
1183 | (rt->fl.iif == 0) && |
1184 | (rt->fl.oif == flp->oif)) { | |
1185 | rt->u.dst.lastuse = jiffies; | |
1186 | dst_hold(&rt->u.dst); | |
1187 | rt->u.dst.__use++; | |
1188 | rcu_read_unlock_bh(); | |
1189 | *pprt = &rt->u.dst; | |
1190 | return 0; | |
1191 | } | |
1192 | } | |
1193 | rcu_read_unlock_bh(); | |
1194 | } | |
1195 | ||
1196 | return dn_route_output_slow(pprt, flp, flags); | |
1197 | } | |
1198 | ||
1199 | static int dn_route_output_key(struct dst_entry **pprt, struct flowi *flp, int flags) | |
1200 | { | |
1201 | int err; | |
1202 | ||
1203 | err = __dn_route_output_key(pprt, flp, flags); | |
1204 | if (err == 0 && flp->proto) { | |
1205 | err = xfrm_lookup(pprt, flp, NULL, 0); | |
1206 | } | |
1207 | return err; | |
1208 | } | |
1209 | ||
1210 | int dn_route_output_sock(struct dst_entry **pprt, struct flowi *fl, struct sock *sk, int flags) | |
1211 | { | |
1212 | int err; | |
1213 | ||
1214 | err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD); | |
1215 | if (err == 0 && fl->proto) { | |
1216 | err = xfrm_lookup(pprt, fl, sk, !(flags & MSG_DONTWAIT)); | |
1217 | } | |
1218 | return err; | |
1219 | } | |
1220 | ||
1221 | static int dn_route_input_slow(struct sk_buff *skb) | |
1222 | { | |
1223 | struct dn_route *rt = NULL; | |
1224 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1225 | struct net_device *in_dev = skb->dev; | |
1226 | struct net_device *out_dev = NULL; | |
1227 | struct dn_dev *dn_db; | |
1228 | struct neighbour *neigh = NULL; | |
1229 | unsigned hash; | |
1230 | int flags = 0; | |
c4ea94ab SW |
1231 | __le16 gateway = 0; |
1232 | __le16 local_src = 0; | |
429eb0fa | 1233 | struct flowi fl = { .nl_u = { .dn_u = |
1da177e4 LT |
1234 | { .daddr = cb->dst, |
1235 | .saddr = cb->src, | |
1236 | .scope = RT_SCOPE_UNIVERSE, | |
1da177e4 | 1237 | } }, |
47dcf0cb | 1238 | .mark = skb->mark, |
1da177e4 LT |
1239 | .iif = skb->dev->ifindex }; |
1240 | struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE }; | |
1241 | int err = -EINVAL; | |
1242 | int free_res = 0; | |
1243 | ||
1244 | dev_hold(in_dev); | |
1245 | ||
1246 | if ((dn_db = in_dev->dn_ptr) == NULL) | |
1247 | goto out; | |
1248 | ||
1249 | /* Zero source addresses are not allowed */ | |
1250 | if (fl.fld_src == 0) | |
1251 | goto out; | |
1252 | ||
1253 | /* | |
1254 | * In this case we've just received a packet from a source | |
1255 | * outside ourselves pretending to come from us. We don't | |
1256 | * allow it any further to prevent routing loops, spoofing and | |
1257 | * other nasties. Loopback packets already have the dst attached | |
1258 | * so this only affects packets which have originated elsewhere. | |
1259 | */ | |
1260 | err = -ENOTUNIQ; | |
1261 | if (dn_dev_islocal(in_dev, cb->src)) | |
1262 | goto out; | |
1263 | ||
1264 | err = dn_fib_lookup(&fl, &res); | |
1265 | if (err) { | |
1266 | if (err != -ESRCH) | |
1267 | goto out; | |
1268 | /* | |
1269 | * Is the destination us ? | |
1270 | */ | |
1271 | if (!dn_dev_islocal(in_dev, cb->dst)) | |
1272 | goto e_inval; | |
1273 | ||
1274 | res.type = RTN_LOCAL; | |
1da177e4 | 1275 | } else { |
c4ea94ab | 1276 | __le16 src_map = fl.fld_src; |
1da177e4 LT |
1277 | free_res = 1; |
1278 | ||
1279 | out_dev = DN_FIB_RES_DEV(res); | |
1280 | if (out_dev == NULL) { | |
1281 | if (net_ratelimit()) | |
1282 | printk(KERN_CRIT "Bug in dn_route_input_slow() " | |
1283 | "No output device\n"); | |
1284 | goto e_inval; | |
1285 | } | |
1286 | dev_hold(out_dev); | |
1287 | ||
1288 | if (res.r) | |
a8731cbf | 1289 | src_map = fl.fld_src; /* no NAT support for now */ |
1da177e4 LT |
1290 | |
1291 | gateway = DN_FIB_RES_GW(res); | |
1292 | if (res.type == RTN_NAT) { | |
1293 | fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res); | |
1294 | dn_fib_res_put(&res); | |
1295 | free_res = 0; | |
1296 | if (dn_fib_lookup(&fl, &res)) | |
1297 | goto e_inval; | |
1298 | free_res = 1; | |
1299 | if (res.type != RTN_UNICAST) | |
1300 | goto e_inval; | |
1301 | flags |= RTCF_DNAT; | |
1302 | gateway = fl.fld_dst; | |
1303 | } | |
1304 | fl.fld_src = src_map; | |
1305 | } | |
1306 | ||
1307 | switch(res.type) { | |
1308 | case RTN_UNICAST: | |
1309 | /* | |
1310 | * Forwarding check here, we only check for forwarding | |
1311 | * being turned off, if you want to only forward intra | |
1312 | * area, its up to you to set the routing tables up | |
1313 | * correctly. | |
1314 | */ | |
1315 | if (dn_db->parms.forwarding == 0) | |
1316 | goto e_inval; | |
1317 | ||
1318 | if (res.fi->fib_nhs > 1 && fl.oif == 0) | |
1319 | dn_fib_select_multipath(&fl, &res); | |
1320 | ||
429eb0fa | 1321 | /* |
1da177e4 LT |
1322 | * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT |
1323 | * flag as a hint to set the intra-ethernet bit when | |
1324 | * forwarding. If we've got NAT in operation, we don't do | |
1325 | * this optimisation. | |
1326 | */ | |
1327 | if (out_dev == in_dev && !(flags & RTCF_NAT)) | |
1328 | flags |= RTCF_DOREDIRECT; | |
1329 | ||
1330 | local_src = DN_FIB_RES_PREFSRC(res); | |
1331 | ||
1332 | case RTN_BLACKHOLE: | |
1333 | case RTN_UNREACHABLE: | |
1334 | break; | |
1335 | case RTN_LOCAL: | |
1336 | flags |= RTCF_LOCAL; | |
1337 | fl.fld_src = cb->dst; | |
1338 | fl.fld_dst = cb->src; | |
1339 | ||
1340 | /* Routing tables gave us a gateway */ | |
1341 | if (gateway) | |
1342 | goto make_route; | |
1343 | ||
1344 | /* Packet was intra-ethernet, so we know its on-link */ | |
3a31b9d2 | 1345 | if (cb->rt_flags & DN_RT_F_IE) { |
1da177e4 LT |
1346 | gateway = cb->src; |
1347 | flags |= RTCF_DIRECTSRC; | |
1348 | goto make_route; | |
1349 | } | |
1350 | ||
1351 | /* Use the default router if there is one */ | |
1352 | neigh = neigh_clone(dn_db->router); | |
1353 | if (neigh) { | |
1354 | gateway = ((struct dn_neigh *)neigh)->addr; | |
1355 | goto make_route; | |
1356 | } | |
1357 | ||
1358 | /* Close eyes and pray */ | |
1359 | gateway = cb->src; | |
1360 | flags |= RTCF_DIRECTSRC; | |
1361 | goto make_route; | |
1362 | default: | |
1363 | goto e_inval; | |
1364 | } | |
1365 | ||
1366 | make_route: | |
1367 | rt = dst_alloc(&dn_dst_ops); | |
1368 | if (rt == NULL) | |
1369 | goto e_nobufs; | |
1370 | ||
1371 | rt->rt_saddr = fl.fld_src; | |
1372 | rt->rt_daddr = fl.fld_dst; | |
1373 | rt->rt_gateway = fl.fld_dst; | |
1374 | if (gateway) | |
1375 | rt->rt_gateway = gateway; | |
1376 | rt->rt_local_src = local_src ? local_src : rt->rt_saddr; | |
1377 | ||
1378 | rt->rt_dst_map = fl.fld_dst; | |
1379 | rt->rt_src_map = fl.fld_src; | |
1380 | ||
1381 | rt->fl.fld_src = cb->src; | |
1382 | rt->fl.fld_dst = cb->dst; | |
1383 | rt->fl.oif = 0; | |
1384 | rt->fl.iif = in_dev->ifindex; | |
47dcf0cb | 1385 | rt->fl.mark = fl.mark; |
1da177e4 LT |
1386 | |
1387 | rt->u.dst.flags = DST_HOST; | |
1388 | rt->u.dst.neighbour = neigh; | |
1389 | rt->u.dst.dev = out_dev; | |
1390 | rt->u.dst.lastuse = jiffies; | |
1391 | rt->u.dst.output = dn_rt_bug; | |
1392 | switch(res.type) { | |
1393 | case RTN_UNICAST: | |
1394 | rt->u.dst.input = dn_forward; | |
1395 | break; | |
1396 | case RTN_LOCAL: | |
1397 | rt->u.dst.output = dn_output; | |
1398 | rt->u.dst.input = dn_nsp_rx; | |
1399 | rt->u.dst.dev = in_dev; | |
1400 | flags |= RTCF_LOCAL; | |
1401 | break; | |
1402 | default: | |
1403 | case RTN_UNREACHABLE: | |
1404 | case RTN_BLACKHOLE: | |
1405 | rt->u.dst.input = dn_blackhole; | |
1406 | } | |
1407 | rt->rt_flags = flags; | |
1408 | if (rt->u.dst.dev) | |
1409 | dev_hold(rt->u.dst.dev); | |
1410 | ||
1411 | err = dn_rt_set_next_hop(rt, &res); | |
1412 | if (err) | |
1413 | goto e_neighbour; | |
1414 | ||
1415 | hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst); | |
1416 | dn_insert_route(rt, hash, (struct dn_route **)&skb->dst); | |
1417 | ||
1418 | done: | |
1419 | if (neigh) | |
1420 | neigh_release(neigh); | |
1421 | if (free_res) | |
1422 | dn_fib_res_put(&res); | |
1423 | dev_put(in_dev); | |
1424 | if (out_dev) | |
1425 | dev_put(out_dev); | |
1426 | out: | |
1427 | return err; | |
1428 | ||
1429 | e_inval: | |
1430 | err = -EINVAL; | |
1431 | goto done; | |
1432 | ||
1433 | e_nobufs: | |
1434 | err = -ENOBUFS; | |
1435 | goto done; | |
1436 | ||
1437 | e_neighbour: | |
1438 | dst_free(&rt->u.dst); | |
1439 | goto done; | |
1440 | } | |
1441 | ||
1442 | int dn_route_input(struct sk_buff *skb) | |
1443 | { | |
1444 | struct dn_route *rt; | |
1445 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
1446 | unsigned hash = dn_hash(cb->src, cb->dst); | |
1447 | ||
1448 | if (skb->dst) | |
1449 | return 0; | |
1450 | ||
1451 | rcu_read_lock(); | |
1452 | for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL; | |
0c195c3f | 1453 | rt = rcu_dereference(rt->u.dst.dn_next)) { |
1da177e4 | 1454 | if ((rt->fl.fld_src == cb->src) && |
429eb0fa | 1455 | (rt->fl.fld_dst == cb->dst) && |
1da177e4 | 1456 | (rt->fl.oif == 0) && |
47dcf0cb | 1457 | (rt->fl.mark == skb->mark) && |
1da177e4 LT |
1458 | (rt->fl.iif == cb->iif)) { |
1459 | rt->u.dst.lastuse = jiffies; | |
1460 | dst_hold(&rt->u.dst); | |
1461 | rt->u.dst.__use++; | |
1462 | rcu_read_unlock(); | |
1463 | skb->dst = (struct dst_entry *)rt; | |
1464 | return 0; | |
1465 | } | |
1466 | } | |
1467 | rcu_read_unlock(); | |
1468 | ||
1469 | return dn_route_input_slow(skb); | |
1470 | } | |
1471 | ||
b6544c0b JHS |
1472 | static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
1473 | int event, int nowait, unsigned int flags) | |
1da177e4 LT |
1474 | { |
1475 | struct dn_route *rt = (struct dn_route *)skb->dst; | |
1476 | struct rtmsg *r; | |
1477 | struct nlmsghdr *nlh; | |
27a884dc | 1478 | unsigned char *b = skb_tail_pointer(skb); |
e3703b3d | 1479 | long expires; |
1da177e4 | 1480 | |
b6544c0b | 1481 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); |
1da177e4 | 1482 | r = NLMSG_DATA(nlh); |
1da177e4 LT |
1483 | r->rtm_family = AF_DECnet; |
1484 | r->rtm_dst_len = 16; | |
1485 | r->rtm_src_len = 0; | |
1486 | r->rtm_tos = 0; | |
1487 | r->rtm_table = RT_TABLE_MAIN; | |
9e762a4a | 1488 | RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN); |
1da177e4 LT |
1489 | r->rtm_type = rt->rt_type; |
1490 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
1491 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
1492 | r->rtm_protocol = RTPROT_UNSPEC; | |
1493 | if (rt->rt_flags & RTCF_NOTIFY) | |
1494 | r->rtm_flags |= RTM_F_NOTIFY; | |
1495 | RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr); | |
1496 | if (rt->fl.fld_src) { | |
1497 | r->rtm_src_len = 16; | |
1498 | RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src); | |
1499 | } | |
1500 | if (rt->u.dst.dev) | |
1501 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex); | |
1502 | /* | |
1503 | * Note to self - change this if input routes reverse direction when | |
1504 | * they deal only with inputs and not with replies like they do | |
1505 | * currently. | |
1506 | */ | |
1507 | RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src); | |
1508 | if (rt->rt_daddr != rt->rt_gateway) | |
1509 | RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway); | |
1510 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) | |
1511 | goto rtattr_failure; | |
e3703b3d TG |
1512 | expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0; |
1513 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, expires, | |
1514 | rt->u.dst.error) < 0) | |
1515 | goto rtattr_failure; | |
1da177e4 LT |
1516 | if (rt->fl.iif) |
1517 | RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif); | |
1518 | ||
27a884dc | 1519 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1520 | return skb->len; |
1521 | ||
1522 | nlmsg_failure: | |
1523 | rtattr_failure: | |
dc5fc579 | 1524 | nlmsg_trim(skb, b); |
429eb0fa | 1525 | return -1; |
1da177e4 LT |
1526 | } |
1527 | ||
1528 | /* | |
1529 | * This is called by both endnodes and routers now. | |
1530 | */ | |
fa34ddd7 | 1531 | static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 LT |
1532 | { |
1533 | struct rtattr **rta = arg; | |
1534 | struct rtmsg *rtm = NLMSG_DATA(nlh); | |
1535 | struct dn_route *rt = NULL; | |
1536 | struct dn_skb_cb *cb; | |
1537 | int err; | |
1538 | struct sk_buff *skb; | |
1539 | struct flowi fl; | |
1540 | ||
1541 | memset(&fl, 0, sizeof(fl)); | |
1542 | fl.proto = DNPROTO_NSP; | |
1543 | ||
1544 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1545 | if (skb == NULL) | |
1546 | return -ENOBUFS; | |
459a98ed | 1547 | skb_reset_mac_header(skb); |
1da177e4 LT |
1548 | cb = DN_SKB_CB(skb); |
1549 | ||
1550 | if (rta[RTA_SRC-1]) | |
1551 | memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2); | |
1552 | if (rta[RTA_DST-1]) | |
1553 | memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2); | |
1554 | if (rta[RTA_IIF-1]) | |
1555 | memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); | |
1556 | ||
1557 | if (fl.iif) { | |
1558 | struct net_device *dev; | |
881d966b | 1559 | if ((dev = dev_get_by_index(&init_net, fl.iif)) == NULL) { |
1da177e4 LT |
1560 | kfree_skb(skb); |
1561 | return -ENODEV; | |
1562 | } | |
1563 | if (!dev->dn_ptr) { | |
1564 | dev_put(dev); | |
1565 | kfree_skb(skb); | |
1566 | return -ENODEV; | |
1567 | } | |
1568 | skb->protocol = __constant_htons(ETH_P_DNA_RT); | |
1569 | skb->dev = dev; | |
1570 | cb->src = fl.fld_src; | |
1571 | cb->dst = fl.fld_dst; | |
1572 | local_bh_disable(); | |
1573 | err = dn_route_input(skb); | |
1574 | local_bh_enable(); | |
1575 | memset(cb, 0, sizeof(struct dn_skb_cb)); | |
1576 | rt = (struct dn_route *)skb->dst; | |
1577 | if (!err && -rt->u.dst.error) | |
1578 | err = rt->u.dst.error; | |
1579 | } else { | |
1580 | int oif = 0; | |
1581 | if (rta[RTA_OIF - 1]) | |
1582 | memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int)); | |
1583 | fl.oif = oif; | |
1584 | err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0); | |
1585 | } | |
1586 | ||
1587 | if (skb->dev) | |
1588 | dev_put(skb->dev); | |
1589 | skb->dev = NULL; | |
1590 | if (err) | |
1591 | goto out_free; | |
1592 | skb->dst = &rt->u.dst; | |
1593 | if (rtm->rtm_flags & RTM_F_NOTIFY) | |
1594 | rt->rt_flags |= RTCF_NOTIFY; | |
1595 | ||
b6544c0b | 1596 | err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0); |
1da177e4 LT |
1597 | |
1598 | if (err == 0) | |
1599 | goto out_free; | |
1600 | if (err < 0) { | |
1601 | err = -EMSGSIZE; | |
1602 | goto out_free; | |
1603 | } | |
1604 | ||
2942e900 | 1605 | return rtnl_unicast(skb, NETLINK_CB(in_skb).pid); |
1da177e4 LT |
1606 | |
1607 | out_free: | |
1608 | kfree_skb(skb); | |
1609 | return err; | |
1610 | } | |
1611 | ||
1612 | /* | |
1613 | * For routers, this is called from dn_fib_dump, but for endnodes its | |
1614 | * called directly from the rtnetlink dispatch table. | |
1615 | */ | |
1616 | int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1617 | { | |
1618 | struct dn_route *rt; | |
1619 | int h, s_h; | |
1620 | int idx, s_idx; | |
1621 | ||
1622 | if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg)) | |
1623 | return -EINVAL; | |
1624 | if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)) | |
1625 | return 0; | |
1626 | ||
1627 | s_h = cb->args[0]; | |
1628 | s_idx = idx = cb->args[1]; | |
1629 | for(h = 0; h <= dn_rt_hash_mask; h++) { | |
1630 | if (h < s_h) | |
1631 | continue; | |
1632 | if (h > s_h) | |
1633 | s_idx = 0; | |
1634 | rcu_read_lock_bh(); | |
1635 | for(rt = rcu_dereference(dn_rt_hash_table[h].chain), idx = 0; | |
1636 | rt; | |
0c195c3f | 1637 | rt = rcu_dereference(rt->u.dst.dn_next), idx++) { |
1da177e4 LT |
1638 | if (idx < s_idx) |
1639 | continue; | |
1640 | skb->dst = dst_clone(&rt->u.dst); | |
1641 | if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid, | |
429eb0fa | 1642 | cb->nlh->nlmsg_seq, RTM_NEWROUTE, |
b6544c0b | 1643 | 1, NLM_F_MULTI) <= 0) { |
1da177e4 LT |
1644 | dst_release(xchg(&skb->dst, NULL)); |
1645 | rcu_read_unlock_bh(); | |
1646 | goto done; | |
1647 | } | |
1648 | dst_release(xchg(&skb->dst, NULL)); | |
1649 | } | |
1650 | rcu_read_unlock_bh(); | |
1651 | } | |
1652 | ||
1653 | done: | |
1654 | cb->args[0] = h; | |
1655 | cb->args[1] = idx; | |
1656 | return skb->len; | |
1657 | } | |
1658 | ||
1659 | #ifdef CONFIG_PROC_FS | |
1660 | struct dn_rt_cache_iter_state { | |
1661 | int bucket; | |
1662 | }; | |
1663 | ||
1664 | static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq) | |
1665 | { | |
1666 | struct dn_route *rt = NULL; | |
1667 | struct dn_rt_cache_iter_state *s = seq->private; | |
1668 | ||
1669 | for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) { | |
1670 | rcu_read_lock_bh(); | |
1671 | rt = dn_rt_hash_table[s->bucket].chain; | |
1672 | if (rt) | |
1673 | break; | |
1674 | rcu_read_unlock_bh(); | |
1675 | } | |
1676 | return rt; | |
1677 | } | |
1678 | ||
1679 | static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt) | |
1680 | { | |
1681 | struct dn_rt_cache_iter_state *s = rcu_dereference(seq->private); | |
1682 | ||
0c195c3f | 1683 | rt = rt->u.dst.dn_next; |
1da177e4 LT |
1684 | while(!rt) { |
1685 | rcu_read_unlock_bh(); | |
1686 | if (--s->bucket < 0) | |
1687 | break; | |
1688 | rcu_read_lock_bh(); | |
1689 | rt = dn_rt_hash_table[s->bucket].chain; | |
1690 | } | |
1691 | return rt; | |
1692 | } | |
1693 | ||
1694 | static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos) | |
1695 | { | |
1696 | struct dn_route *rt = dn_rt_cache_get_first(seq); | |
1697 | ||
1698 | if (rt) { | |
1699 | while(*pos && (rt = dn_rt_cache_get_next(seq, rt))) | |
1700 | --*pos; | |
1701 | } | |
1702 | return *pos ? NULL : rt; | |
1703 | } | |
1704 | ||
1705 | static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1706 | { | |
1707 | struct dn_route *rt = dn_rt_cache_get_next(seq, v); | |
1708 | ++*pos; | |
1709 | return rt; | |
1710 | } | |
1711 | ||
1712 | static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v) | |
1713 | { | |
1714 | if (v) | |
1715 | rcu_read_unlock_bh(); | |
1716 | } | |
1717 | ||
1718 | static int dn_rt_cache_seq_show(struct seq_file *seq, void *v) | |
1719 | { | |
1720 | struct dn_route *rt = v; | |
1721 | char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN]; | |
1722 | ||
1723 | seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n", | |
1724 | rt->u.dst.dev ? rt->u.dst.dev->name : "*", | |
1725 | dn_addr2asc(dn_ntohs(rt->rt_daddr), buf1), | |
1726 | dn_addr2asc(dn_ntohs(rt->rt_saddr), buf2), | |
1727 | atomic_read(&rt->u.dst.__refcnt), | |
1728 | rt->u.dst.__use, | |
1729 | (int) dst_metric(&rt->u.dst, RTAX_RTT)); | |
1730 | return 0; | |
429eb0fa | 1731 | } |
1da177e4 | 1732 | |
56b3d975 | 1733 | static const struct seq_operations dn_rt_cache_seq_ops = { |
1da177e4 LT |
1734 | .start = dn_rt_cache_seq_start, |
1735 | .next = dn_rt_cache_seq_next, | |
1736 | .stop = dn_rt_cache_seq_stop, | |
1737 | .show = dn_rt_cache_seq_show, | |
1738 | }; | |
1739 | ||
1740 | static int dn_rt_cache_seq_open(struct inode *inode, struct file *file) | |
1741 | { | |
1742 | struct seq_file *seq; | |
1743 | int rc = -ENOMEM; | |
f8796654 | 1744 | struct dn_rt_cache_iter_state *s; |
1da177e4 | 1745 | |
f8796654 | 1746 | s = kzalloc(sizeof(*s), GFP_KERNEL); |
1da177e4 LT |
1747 | if (!s) |
1748 | goto out; | |
1749 | rc = seq_open(file, &dn_rt_cache_seq_ops); | |
1750 | if (rc) | |
1751 | goto out_kfree; | |
1752 | seq = file->private_data; | |
1753 | seq->private = s; | |
1da177e4 LT |
1754 | out: |
1755 | return rc; | |
1756 | out_kfree: | |
1757 | kfree(s); | |
1758 | goto out; | |
1759 | } | |
1760 | ||
9a32144e | 1761 | static const struct file_operations dn_rt_cache_seq_fops = { |
1da177e4 LT |
1762 | .owner = THIS_MODULE, |
1763 | .open = dn_rt_cache_seq_open, | |
1764 | .read = seq_read, | |
1765 | .llseek = seq_lseek, | |
1766 | .release = seq_release_private, | |
1767 | }; | |
1768 | ||
1769 | #endif /* CONFIG_PROC_FS */ | |
1770 | ||
1771 | void __init dn_route_init(void) | |
1772 | { | |
1773 | int i, goal, order; | |
1774 | ||
e5d679f3 AD |
1775 | dn_dst_ops.kmem_cachep = |
1776 | kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0, | |
20c2df83 | 1777 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 LT |
1778 | init_timer(&dn_route_timer); |
1779 | dn_route_timer.function = dn_dst_check_expire; | |
1780 | dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; | |
1781 | add_timer(&dn_route_timer); | |
1782 | ||
1783 | goal = num_physpages >> (26 - PAGE_SHIFT); | |
1784 | ||
1785 | for(order = 0; (1UL << order) < goal; order++) | |
1786 | /* NOTHING */; | |
1787 | ||
429eb0fa YH |
1788 | /* |
1789 | * Only want 1024 entries max, since the table is very, very unlikely | |
1790 | * to be larger than that. | |
1791 | */ | |
1792 | while(order && ((((1UL << order) * PAGE_SIZE) / | |
1793 | sizeof(struct dn_rt_hash_bucket)) >= 2048)) | |
1794 | order--; | |
1795 | ||
1796 | do { | |
1797 | dn_rt_hash_mask = (1UL << order) * PAGE_SIZE / | |
1798 | sizeof(struct dn_rt_hash_bucket); | |
1799 | while(dn_rt_hash_mask & (dn_rt_hash_mask - 1)) | |
1800 | dn_rt_hash_mask--; | |
1801 | dn_rt_hash_table = (struct dn_rt_hash_bucket *) | |
1802 | __get_free_pages(GFP_ATOMIC, order); | |
1803 | } while (dn_rt_hash_table == NULL && --order > 0); | |
1da177e4 LT |
1804 | |
1805 | if (!dn_rt_hash_table) | |
429eb0fa | 1806 | panic("Failed to allocate DECnet route cache hash table\n"); |
1da177e4 | 1807 | |
429eb0fa YH |
1808 | printk(KERN_INFO |
1809 | "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n", | |
1810 | dn_rt_hash_mask, | |
1da177e4 LT |
1811 | (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024); |
1812 | ||
1813 | dn_rt_hash_mask--; | |
429eb0fa YH |
1814 | for(i = 0; i <= dn_rt_hash_mask; i++) { |
1815 | spin_lock_init(&dn_rt_hash_table[i].lock); | |
1816 | dn_rt_hash_table[i].chain = NULL; | |
1817 | } | |
1da177e4 | 1818 | |
429eb0fa | 1819 | dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1); |
1da177e4 | 1820 | |
457c4cbc | 1821 | proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops); |
fa34ddd7 TG |
1822 | |
1823 | #ifdef CONFIG_DECNET_ROUTER | |
1824 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, dn_fib_dump); | |
1825 | #else | |
1826 | rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, | |
1827 | dn_cache_dump); | |
1828 | #endif | |
1da177e4 LT |
1829 | } |
1830 | ||
1831 | void __exit dn_route_cleanup(void) | |
1832 | { | |
1833 | del_timer(&dn_route_timer); | |
1834 | dn_run_flush(0); | |
1835 | ||
457c4cbc | 1836 | proc_net_remove(&init_net, "decnet_cache"); |
1da177e4 LT |
1837 | } |
1838 |