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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / decnet / dn_route.c
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
46
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
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 <linux/slab.h>
70 #include <net/sock.h>
71 #include <linux/mm.h>
72 #include <linux/proc_fs.h>
73 #include <linux/seq_file.h>
74 #include <linux/init.h>
75 #include <linux/rtnetlink.h>
76 #include <linux/string.h>
77 #include <linux/netfilter_decnet.h>
78 #include <linux/rcupdate.h>
79 #include <linux/times.h>
80 #include <asm/errno.h>
81 #include <net/net_namespace.h>
82 #include <net/netlink.h>
83 #include <net/neighbour.h>
84 #include <net/dst.h>
85 #include <net/flow.h>
86 #include <net/fib_rules.h>
87 #include <net/dn.h>
88 #include <net/dn_dev.h>
89 #include <net/dn_nsp.h>
90 #include <net/dn_route.h>
91 #include <net/dn_neigh.h>
92 #include <net/dn_fib.h>
93
94 struct dn_rt_hash_bucket
95 {
96 struct dn_route *chain;
97 spinlock_t lock;
98 };
99
100 extern struct neigh_table dn_neigh_table;
101
102
103 static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00};
104
105 static const int dn_rt_min_delay = 2 * HZ;
106 static const int dn_rt_max_delay = 10 * HZ;
107 static const int dn_rt_mtu_expires = 10 * 60 * HZ;
108
109 static unsigned long dn_rt_deadline;
110
111 static int dn_dst_gc(struct dst_ops *ops);
112 static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
113 static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
114 static void dn_dst_link_failure(struct sk_buff *);
115 static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu);
116 static int dn_route_input(struct sk_buff *);
117 static void dn_run_flush(unsigned long dummy);
118
119 static struct dn_rt_hash_bucket *dn_rt_hash_table;
120 static unsigned dn_rt_hash_mask;
121
122 static struct timer_list dn_route_timer;
123 static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0);
124 int decnet_dst_gc_interval = 2;
125
126 static struct dst_ops dn_dst_ops = {
127 .family = PF_DECnet,
128 .protocol = cpu_to_be16(ETH_P_DNA_RT),
129 .gc_thresh = 128,
130 .gc = dn_dst_gc,
131 .check = dn_dst_check,
132 .negative_advice = dn_dst_negative_advice,
133 .link_failure = dn_dst_link_failure,
134 .update_pmtu = dn_dst_update_pmtu,
135 .entries = ATOMIC_INIT(0),
136 };
137
138 static __inline__ unsigned dn_hash(__le16 src, __le16 dst)
139 {
140 __u16 tmp = (__u16 __force)(src ^ dst);
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 {
154 dst_release(&rt->u.dst);
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) {
172 rtp = &rt->u.dst.dn_next;
173 continue;
174 }
175 *rtp = rt->u.dst.dn_next;
176 rt->u.dst.dn_next = NULL;
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(struct dst_ops *ops)
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) {
203 rtp = &rt->u.dst.dn_next;
204 continue;
205 }
206 *rtp = rt->u.dst.dn_next;
207 rt->u.dst.dn_next = NULL;
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_metric(dst, RTAX_MTU) > 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_metric(dst, RTAX_ADVMSS) > mss)
246 dst->metrics[RTAX_ADVMSS-1] = mss;
247 }
248 }
249 }
250
251 /*
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 {
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) |
274 (fl1->mark ^ fl2->mark) |
275 (fl1->nl_u.dn_u.scope ^ fl2->nl_u.dn_u.scope) |
276 (fl1->oif ^ fl2->oif) |
277 (fl1->iif ^ fl2->iif)) == 0;
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 */
291 *rthp = rth->u.dst.dn_next;
292 rcu_assign_pointer(rth->u.dst.dn_next,
293 dn_rt_hash_table[hash].chain);
294 rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth);
295
296 dst_use(&rth->u.dst, now);
297 spin_unlock_bh(&dn_rt_hash_table[hash].lock);
298
299 dnrt_drop(rt);
300 *rp = rth;
301 return 0;
302 }
303 rthp = &rth->u.dst.dn_next;
304 }
305
306 rcu_assign_pointer(rt->u.dst.dn_next, dn_rt_hash_table[hash].chain);
307 rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt);
308
309 dst_use(&rt->u.dst, now);
310 spin_unlock_bh(&dn_rt_hash_table[hash].lock);
311 *rp = rt;
312 return 0;
313 }
314
315 static 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) {
327 next = rt->u.dst.dn_next;
328 rt->u.dst.dn_next = NULL;
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;
382 __le16 *src;
383 __le16 *dst;
384
385 /* Add back headers */
386 skb_push(skb, skb->data - skb_network_header(skb));
387
388 if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
389 return NET_RX_DROP;
390
391 cb = DN_SKB_CB(skb);
392 /* Skip packet length and point to flags */
393 ptr = skb->data + 2;
394 *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
395
396 dst = (__le16 *)ptr;
397 ptr += 2;
398 src = (__le16 *)ptr;
399 ptr += 2;
400 *ptr = 0; /* Zero hop count */
401
402 swap(*src, *dst);
403
404 skb->pkt_type = PACKET_OUTGOING;
405 dn_rt_finish_output(skb, NULL, NULL);
406 return NET_RX_SUCCESS;
407 }
408
409 /**
410 * dn_return_long - Return a long packet to its sender
411 * @skb: The long format packet to return
412 *
413 */
414 static int dn_return_long(struct sk_buff *skb)
415 {
416 struct dn_skb_cb *cb;
417 unsigned char *ptr;
418 unsigned char *src_addr, *dst_addr;
419 unsigned char tmp[ETH_ALEN];
420
421 /* Add back all headers */
422 skb_push(skb, skb->data - skb_network_header(skb));
423
424 if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
425 return NET_RX_DROP;
426
427 cb = DN_SKB_CB(skb);
428 /* Ignore packet length and point to flags */
429 ptr = skb->data + 2;
430
431 /* Skip padding */
432 if (*ptr & DN_RT_F_PF) {
433 char padlen = (*ptr & ~DN_RT_F_PF);
434 ptr += padlen;
435 }
436
437 *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
438 ptr += 2;
439 dst_addr = ptr;
440 ptr += 8;
441 src_addr = ptr;
442 ptr += 6;
443 *ptr = 0; /* Zero hop count */
444
445 /* Swap source and destination */
446 memcpy(tmp, src_addr, ETH_ALEN);
447 memcpy(src_addr, dst_addr, ETH_ALEN);
448 memcpy(dst_addr, tmp, ETH_ALEN);
449
450 skb->pkt_type = PACKET_OUTGOING;
451 dn_rt_finish_output(skb, dst_addr, src_addr);
452 return NET_RX_SUCCESS;
453 }
454
455 /**
456 * dn_route_rx_packet - Try and find a route for an incoming packet
457 * @skb: The packet to find a route for
458 *
459 * Returns: result of input function if route is found, error code otherwise
460 */
461 static int dn_route_rx_packet(struct sk_buff *skb)
462 {
463 struct dn_skb_cb *cb = DN_SKB_CB(skb);
464 int err;
465
466 if ((err = dn_route_input(skb)) == 0)
467 return dst_input(skb);
468
469 if (decnet_debug_level & 4) {
470 char *devname = skb->dev ? skb->dev->name : "???";
471 struct dn_skb_cb *cb = DN_SKB_CB(skb);
472 printk(KERN_DEBUG
473 "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n",
474 (int)cb->rt_flags, devname, skb->len,
475 le16_to_cpu(cb->src), le16_to_cpu(cb->dst),
476 err, skb->pkt_type);
477 }
478
479 if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) {
480 switch(cb->rt_flags & DN_RT_PKT_MSK) {
481 case DN_RT_PKT_SHORT:
482 return dn_return_short(skb);
483 case DN_RT_PKT_LONG:
484 return dn_return_long(skb);
485 }
486 }
487
488 kfree_skb(skb);
489 return NET_RX_DROP;
490 }
491
492 static int dn_route_rx_long(struct sk_buff *skb)
493 {
494 struct dn_skb_cb *cb = DN_SKB_CB(skb);
495 unsigned char *ptr = skb->data;
496
497 if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */
498 goto drop_it;
499
500 skb_pull(skb, 20);
501 skb_reset_transport_header(skb);
502
503 /* Destination info */
504 ptr += 2;
505 cb->dst = dn_eth2dn(ptr);
506 if (memcmp(ptr, dn_hiord_addr, 4) != 0)
507 goto drop_it;
508 ptr += 6;
509
510
511 /* Source info */
512 ptr += 2;
513 cb->src = dn_eth2dn(ptr);
514 if (memcmp(ptr, dn_hiord_addr, 4) != 0)
515 goto drop_it;
516 ptr += 6;
517 /* Other junk */
518 ptr++;
519 cb->hops = *ptr++; /* Visit Count */
520
521 return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet);
522
523 drop_it:
524 kfree_skb(skb);
525 return NET_RX_DROP;
526 }
527
528
529
530 static int dn_route_rx_short(struct sk_buff *skb)
531 {
532 struct dn_skb_cb *cb = DN_SKB_CB(skb);
533 unsigned char *ptr = skb->data;
534
535 if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */
536 goto drop_it;
537
538 skb_pull(skb, 5);
539 skb_reset_transport_header(skb);
540
541 cb->dst = *(__le16 *)ptr;
542 ptr += 2;
543 cb->src = *(__le16 *)ptr;
544 ptr += 2;
545 cb->hops = *ptr & 0x3f;
546
547 return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet);
548
549 drop_it:
550 kfree_skb(skb);
551 return NET_RX_DROP;
552 }
553
554 static int dn_route_discard(struct sk_buff *skb)
555 {
556 /*
557 * I know we drop the packet here, but thats considered success in
558 * this case
559 */
560 kfree_skb(skb);
561 return NET_RX_SUCCESS;
562 }
563
564 static int dn_route_ptp_hello(struct sk_buff *skb)
565 {
566 dn_dev_hello(skb);
567 dn_neigh_pointopoint_hello(skb);
568 return NET_RX_SUCCESS;
569 }
570
571 int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
572 {
573 struct dn_skb_cb *cb;
574 unsigned char flags = 0;
575 __u16 len = le16_to_cpu(*(__le16 *)skb->data);
576 struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr;
577 unsigned char padlen = 0;
578
579 if (!net_eq(dev_net(dev), &init_net))
580 goto dump_it;
581
582 if (dn == NULL)
583 goto dump_it;
584
585 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
586 goto out;
587
588 if (!pskb_may_pull(skb, 3))
589 goto dump_it;
590
591 skb_pull(skb, 2);
592
593 if (len > skb->len)
594 goto dump_it;
595
596 skb_trim(skb, len);
597
598 flags = *skb->data;
599
600 cb = DN_SKB_CB(skb);
601 cb->stamp = jiffies;
602 cb->iif = dev->ifindex;
603
604 /*
605 * If we have padding, remove it.
606 */
607 if (flags & DN_RT_F_PF) {
608 padlen = flags & ~DN_RT_F_PF;
609 if (!pskb_may_pull(skb, padlen + 1))
610 goto dump_it;
611 skb_pull(skb, padlen);
612 flags = *skb->data;
613 }
614
615 skb_reset_network_header(skb);
616
617 /*
618 * Weed out future version DECnet
619 */
620 if (flags & DN_RT_F_VER)
621 goto dump_it;
622
623 cb->rt_flags = flags;
624
625 if (decnet_debug_level & 1)
626 printk(KERN_DEBUG
627 "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n",
628 (int)flags, (dev) ? dev->name : "???", len, skb->len,
629 padlen);
630
631 if (flags & DN_RT_PKT_CNTL) {
632 if (unlikely(skb_linearize(skb)))
633 goto dump_it;
634
635 switch(flags & DN_RT_CNTL_MSK) {
636 case DN_RT_PKT_INIT:
637 dn_dev_init_pkt(skb);
638 break;
639 case DN_RT_PKT_VERI:
640 dn_dev_veri_pkt(skb);
641 break;
642 }
643
644 if (dn->parms.state != DN_DEV_S_RU)
645 goto dump_it;
646
647 switch(flags & DN_RT_CNTL_MSK) {
648 case DN_RT_PKT_HELO:
649 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_route_ptp_hello);
650
651 case DN_RT_PKT_L1RT:
652 case DN_RT_PKT_L2RT:
653 return NF_HOOK(PF_DECnet, NF_DN_ROUTE, skb, skb->dev, NULL, dn_route_discard);
654 case DN_RT_PKT_ERTH:
655 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_router_hello);
656
657 case DN_RT_PKT_EEDH:
658 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_endnode_hello);
659 }
660 } else {
661 if (dn->parms.state != DN_DEV_S_RU)
662 goto dump_it;
663
664 skb_pull(skb, 1); /* Pull flags */
665
666 switch(flags & DN_RT_PKT_MSK) {
667 case DN_RT_PKT_LONG:
668 return dn_route_rx_long(skb);
669 case DN_RT_PKT_SHORT:
670 return dn_route_rx_short(skb);
671 }
672 }
673
674 dump_it:
675 kfree_skb(skb);
676 out:
677 return NET_RX_DROP;
678 }
679
680 static int dn_output(struct sk_buff *skb)
681 {
682 struct dst_entry *dst = skb_dst(skb);
683 struct dn_route *rt = (struct dn_route *)dst;
684 struct net_device *dev = dst->dev;
685 struct dn_skb_cb *cb = DN_SKB_CB(skb);
686 struct neighbour *neigh;
687
688 int err = -EINVAL;
689
690 if ((neigh = dst->neighbour) == NULL)
691 goto error;
692
693 skb->dev = dev;
694
695 cb->src = rt->rt_saddr;
696 cb->dst = rt->rt_daddr;
697
698 /*
699 * Always set the Intra-Ethernet bit on all outgoing packets
700 * originated on this node. Only valid flag from upper layers
701 * is return-to-sender-requested. Set hop count to 0 too.
702 */
703 cb->rt_flags &= ~DN_RT_F_RQR;
704 cb->rt_flags |= DN_RT_F_IE;
705 cb->hops = 0;
706
707 return NF_HOOK(PF_DECnet, NF_DN_LOCAL_OUT, skb, NULL, dev, neigh->output);
708
709 error:
710 if (net_ratelimit())
711 printk(KERN_DEBUG "dn_output: This should not happen\n");
712
713 kfree_skb(skb);
714
715 return err;
716 }
717
718 static int dn_forward(struct sk_buff *skb)
719 {
720 struct dn_skb_cb *cb = DN_SKB_CB(skb);
721 struct dst_entry *dst = skb_dst(skb);
722 struct dn_dev *dn_db = dst->dev->dn_ptr;
723 struct dn_route *rt;
724 struct neighbour *neigh = dst->neighbour;
725 int header_len;
726 #ifdef CONFIG_NETFILTER
727 struct net_device *dev = skb->dev;
728 #endif
729
730 if (skb->pkt_type != PACKET_HOST)
731 goto drop;
732
733 /* Ensure that we have enough space for headers */
734 rt = (struct dn_route *)skb_dst(skb);
735 header_len = dn_db->use_long ? 21 : 6;
736 if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+header_len))
737 goto drop;
738
739 /*
740 * Hop count exceeded.
741 */
742 if (++cb->hops > 30)
743 goto drop;
744
745 skb->dev = rt->u.dst.dev;
746
747 /*
748 * If packet goes out same interface it came in on, then set
749 * the Intra-Ethernet bit. This has no effect for short
750 * packets, so we don't need to test for them here.
751 */
752 cb->rt_flags &= ~DN_RT_F_IE;
753 if (rt->rt_flags & RTCF_DOREDIRECT)
754 cb->rt_flags |= DN_RT_F_IE;
755
756 return NF_HOOK(PF_DECnet, NF_DN_FORWARD, skb, dev, skb->dev, neigh->output);
757
758 drop:
759 kfree_skb(skb);
760 return NET_RX_DROP;
761 }
762
763 /*
764 * Used to catch bugs. This should never normally get
765 * called.
766 */
767 static int dn_rt_bug(struct sk_buff *skb)
768 {
769 if (net_ratelimit()) {
770 struct dn_skb_cb *cb = DN_SKB_CB(skb);
771
772 printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n",
773 le16_to_cpu(cb->src), le16_to_cpu(cb->dst));
774 }
775
776 kfree_skb(skb);
777
778 return NET_RX_DROP;
779 }
780
781 static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
782 {
783 struct dn_fib_info *fi = res->fi;
784 struct net_device *dev = rt->u.dst.dev;
785 struct neighbour *n;
786 unsigned mss;
787
788 if (fi) {
789 if (DN_FIB_RES_GW(*res) &&
790 DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
791 rt->rt_gateway = DN_FIB_RES_GW(*res);
792 memcpy(rt->u.dst.metrics, fi->fib_metrics,
793 sizeof(rt->u.dst.metrics));
794 }
795 rt->rt_type = res->type;
796
797 if (dev != NULL && rt->u.dst.neighbour == NULL) {
798 n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev);
799 if (IS_ERR(n))
800 return PTR_ERR(n);
801 rt->u.dst.neighbour = n;
802 }
803
804 if (dst_metric(&rt->u.dst, RTAX_MTU) == 0 ||
805 dst_metric(&rt->u.dst, RTAX_MTU) > rt->u.dst.dev->mtu)
806 rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu;
807 mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->u.dst));
808 if (dst_metric(&rt->u.dst, RTAX_ADVMSS) == 0 ||
809 dst_metric(&rt->u.dst, RTAX_ADVMSS) > mss)
810 rt->u.dst.metrics[RTAX_ADVMSS-1] = mss;
811 return 0;
812 }
813
814 static inline int dn_match_addr(__le16 addr1, __le16 addr2)
815 {
816 __u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(addr2);
817 int match = 16;
818 while(tmp) {
819 tmp >>= 1;
820 match--;
821 }
822 return match;
823 }
824
825 static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope)
826 {
827 __le16 saddr = 0;
828 struct dn_dev *dn_db = dev->dn_ptr;
829 struct dn_ifaddr *ifa;
830 int best_match = 0;
831 int ret;
832
833 read_lock(&dev_base_lock);
834 for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
835 if (ifa->ifa_scope > scope)
836 continue;
837 if (!daddr) {
838 saddr = ifa->ifa_local;
839 break;
840 }
841 ret = dn_match_addr(daddr, ifa->ifa_local);
842 if (ret > best_match)
843 saddr = ifa->ifa_local;
844 if (best_match == 0)
845 saddr = ifa->ifa_local;
846 }
847 read_unlock(&dev_base_lock);
848
849 return saddr;
850 }
851
852 static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res)
853 {
854 return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope);
855 }
856
857 static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res)
858 {
859 __le16 mask = dnet_make_mask(res->prefixlen);
860 return (daddr&~mask)|res->fi->fib_nh->nh_gw;
861 }
862
863 static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard)
864 {
865 struct flowi fl = { .nl_u = { .dn_u =
866 { .daddr = oldflp->fld_dst,
867 .saddr = oldflp->fld_src,
868 .scope = RT_SCOPE_UNIVERSE,
869 } },
870 .mark = oldflp->mark,
871 .iif = init_net.loopback_dev->ifindex,
872 .oif = oldflp->oif };
873 struct dn_route *rt = NULL;
874 struct net_device *dev_out = NULL, *dev;
875 struct neighbour *neigh = NULL;
876 unsigned hash;
877 unsigned flags = 0;
878 struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST };
879 int err;
880 int free_res = 0;
881 __le16 gateway = 0;
882
883 if (decnet_debug_level & 16)
884 printk(KERN_DEBUG
885 "dn_route_output_slow: dst=%04x src=%04x mark=%d"
886 " iif=%d oif=%d\n", le16_to_cpu(oldflp->fld_dst),
887 le16_to_cpu(oldflp->fld_src),
888 oldflp->mark, init_net.loopback_dev->ifindex, oldflp->oif);
889
890 /* If we have an output interface, verify its a DECnet device */
891 if (oldflp->oif) {
892 dev_out = dev_get_by_index(&init_net, oldflp->oif);
893 err = -ENODEV;
894 if (dev_out && dev_out->dn_ptr == NULL) {
895 dev_put(dev_out);
896 dev_out = NULL;
897 }
898 if (dev_out == NULL)
899 goto out;
900 }
901
902 /* If we have a source address, verify that its a local address */
903 if (oldflp->fld_src) {
904 err = -EADDRNOTAVAIL;
905
906 if (dev_out) {
907 if (dn_dev_islocal(dev_out, oldflp->fld_src))
908 goto source_ok;
909 dev_put(dev_out);
910 goto out;
911 }
912 rcu_read_lock();
913 for_each_netdev_rcu(&init_net, dev) {
914 if (!dev->dn_ptr)
915 continue;
916 if (!dn_dev_islocal(dev, oldflp->fld_src))
917 continue;
918 if ((dev->flags & IFF_LOOPBACK) &&
919 oldflp->fld_dst &&
920 !dn_dev_islocal(dev, oldflp->fld_dst))
921 continue;
922
923 dev_out = dev;
924 break;
925 }
926 rcu_read_unlock();
927 if (dev_out == NULL)
928 goto out;
929 dev_hold(dev_out);
930 source_ok:
931 ;
932 }
933
934 /* No destination? Assume its local */
935 if (!fl.fld_dst) {
936 fl.fld_dst = fl.fld_src;
937
938 err = -EADDRNOTAVAIL;
939 if (dev_out)
940 dev_put(dev_out);
941 dev_out = init_net.loopback_dev;
942 dev_hold(dev_out);
943 if (!fl.fld_dst) {
944 fl.fld_dst =
945 fl.fld_src = dnet_select_source(dev_out, 0,
946 RT_SCOPE_HOST);
947 if (!fl.fld_dst)
948 goto out;
949 }
950 fl.oif = init_net.loopback_dev->ifindex;
951 res.type = RTN_LOCAL;
952 goto make_route;
953 }
954
955 if (decnet_debug_level & 16)
956 printk(KERN_DEBUG
957 "dn_route_output_slow: initial checks complete."
958 " dst=%o4x src=%04x oif=%d try_hard=%d\n",
959 le16_to_cpu(fl.fld_dst), le16_to_cpu(fl.fld_src),
960 fl.oif, try_hard);
961
962 /*
963 * N.B. If the kernel is compiled without router support then
964 * dn_fib_lookup() will evaluate to non-zero so this if () block
965 * will always be executed.
966 */
967 err = -ESRCH;
968 if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) {
969 struct dn_dev *dn_db;
970 if (err != -ESRCH)
971 goto out;
972 /*
973 * Here the fallback is basically the standard algorithm for
974 * routing in endnodes which is described in the DECnet routing
975 * docs
976 *
977 * If we are not trying hard, look in neighbour cache.
978 * The result is tested to ensure that if a specific output
979 * device/source address was requested, then we honour that
980 * here
981 */
982 if (!try_hard) {
983 neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fl.fld_dst);
984 if (neigh) {
985 if ((oldflp->oif &&
986 (neigh->dev->ifindex != oldflp->oif)) ||
987 (oldflp->fld_src &&
988 (!dn_dev_islocal(neigh->dev,
989 oldflp->fld_src)))) {
990 neigh_release(neigh);
991 neigh = NULL;
992 } else {
993 if (dev_out)
994 dev_put(dev_out);
995 if (dn_dev_islocal(neigh->dev, fl.fld_dst)) {
996 dev_out = init_net.loopback_dev;
997 res.type = RTN_LOCAL;
998 } else {
999 dev_out = neigh->dev;
1000 }
1001 dev_hold(dev_out);
1002 goto select_source;
1003 }
1004 }
1005 }
1006
1007 /* Not there? Perhaps its a local address */
1008 if (dev_out == NULL)
1009 dev_out = dn_dev_get_default();
1010 err = -ENODEV;
1011 if (dev_out == NULL)
1012 goto out;
1013 dn_db = dev_out->dn_ptr;
1014 /* Possible improvement - check all devices for local addr */
1015 if (dn_dev_islocal(dev_out, fl.fld_dst)) {
1016 dev_put(dev_out);
1017 dev_out = init_net.loopback_dev;
1018 dev_hold(dev_out);
1019 res.type = RTN_LOCAL;
1020 goto select_source;
1021 }
1022 /* Not local either.... try sending it to the default router */
1023 neigh = neigh_clone(dn_db->router);
1024 BUG_ON(neigh && neigh->dev != dev_out);
1025
1026 /* Ok then, we assume its directly connected and move on */
1027 select_source:
1028 if (neigh)
1029 gateway = ((struct dn_neigh *)neigh)->addr;
1030 if (gateway == 0)
1031 gateway = fl.fld_dst;
1032 if (fl.fld_src == 0) {
1033 fl.fld_src = dnet_select_source(dev_out, gateway,
1034 res.type == RTN_LOCAL ?
1035 RT_SCOPE_HOST :
1036 RT_SCOPE_LINK);
1037 if (fl.fld_src == 0 && res.type != RTN_LOCAL)
1038 goto e_addr;
1039 }
1040 fl.oif = dev_out->ifindex;
1041 goto make_route;
1042 }
1043 free_res = 1;
1044
1045 if (res.type == RTN_NAT)
1046 goto e_inval;
1047
1048 if (res.type == RTN_LOCAL) {
1049 if (!fl.fld_src)
1050 fl.fld_src = fl.fld_dst;
1051 if (dev_out)
1052 dev_put(dev_out);
1053 dev_out = init_net.loopback_dev;
1054 dev_hold(dev_out);
1055 fl.oif = dev_out->ifindex;
1056 if (res.fi)
1057 dn_fib_info_put(res.fi);
1058 res.fi = NULL;
1059 goto make_route;
1060 }
1061
1062 if (res.fi->fib_nhs > 1 && fl.oif == 0)
1063 dn_fib_select_multipath(&fl, &res);
1064
1065 /*
1066 * We could add some logic to deal with default routes here and
1067 * get rid of some of the special casing above.
1068 */
1069
1070 if (!fl.fld_src)
1071 fl.fld_src = DN_FIB_RES_PREFSRC(res);
1072
1073 if (dev_out)
1074 dev_put(dev_out);
1075 dev_out = DN_FIB_RES_DEV(res);
1076 dev_hold(dev_out);
1077 fl.oif = dev_out->ifindex;
1078 gateway = DN_FIB_RES_GW(res);
1079
1080 make_route:
1081 if (dev_out->flags & IFF_LOOPBACK)
1082 flags |= RTCF_LOCAL;
1083
1084 rt = dst_alloc(&dn_dst_ops);
1085 if (rt == NULL)
1086 goto e_nobufs;
1087
1088 atomic_set(&rt->u.dst.__refcnt, 1);
1089 rt->u.dst.flags = DST_HOST;
1090
1091 rt->fl.fld_src = oldflp->fld_src;
1092 rt->fl.fld_dst = oldflp->fld_dst;
1093 rt->fl.oif = oldflp->oif;
1094 rt->fl.iif = 0;
1095 rt->fl.mark = oldflp->mark;
1096
1097 rt->rt_saddr = fl.fld_src;
1098 rt->rt_daddr = fl.fld_dst;
1099 rt->rt_gateway = gateway ? gateway : fl.fld_dst;
1100 rt->rt_local_src = fl.fld_src;
1101
1102 rt->rt_dst_map = fl.fld_dst;
1103 rt->rt_src_map = fl.fld_src;
1104
1105 rt->u.dst.dev = dev_out;
1106 dev_hold(dev_out);
1107 rt->u.dst.neighbour = neigh;
1108 neigh = NULL;
1109
1110 rt->u.dst.lastuse = jiffies;
1111 rt->u.dst.output = dn_output;
1112 rt->u.dst.input = dn_rt_bug;
1113 rt->rt_flags = flags;
1114 if (flags & RTCF_LOCAL)
1115 rt->u.dst.input = dn_nsp_rx;
1116
1117 err = dn_rt_set_next_hop(rt, &res);
1118 if (err)
1119 goto e_neighbour;
1120
1121 hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst);
1122 dn_insert_route(rt, hash, (struct dn_route **)pprt);
1123
1124 done:
1125 if (neigh)
1126 neigh_release(neigh);
1127 if (free_res)
1128 dn_fib_res_put(&res);
1129 if (dev_out)
1130 dev_put(dev_out);
1131 out:
1132 return err;
1133
1134 e_addr:
1135 err = -EADDRNOTAVAIL;
1136 goto done;
1137 e_inval:
1138 err = -EINVAL;
1139 goto done;
1140 e_nobufs:
1141 err = -ENOBUFS;
1142 goto done;
1143 e_neighbour:
1144 dst_free(&rt->u.dst);
1145 goto e_nobufs;
1146 }
1147
1148
1149 /*
1150 * N.B. The flags may be moved into the flowi at some future stage.
1151 */
1152 static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags)
1153 {
1154 unsigned hash = dn_hash(flp->fld_src, flp->fld_dst);
1155 struct dn_route *rt = NULL;
1156
1157 if (!(flags & MSG_TRYHARD)) {
1158 rcu_read_lock_bh();
1159 for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt;
1160 rt = rcu_dereference_bh(rt->u.dst.dn_next)) {
1161 if ((flp->fld_dst == rt->fl.fld_dst) &&
1162 (flp->fld_src == rt->fl.fld_src) &&
1163 (flp->mark == rt->fl.mark) &&
1164 (rt->fl.iif == 0) &&
1165 (rt->fl.oif == flp->oif)) {
1166 dst_use(&rt->u.dst, jiffies);
1167 rcu_read_unlock_bh();
1168 *pprt = &rt->u.dst;
1169 return 0;
1170 }
1171 }
1172 rcu_read_unlock_bh();
1173 }
1174
1175 return dn_route_output_slow(pprt, flp, flags);
1176 }
1177
1178 static int dn_route_output_key(struct dst_entry **pprt, struct flowi *flp, int flags)
1179 {
1180 int err;
1181
1182 err = __dn_route_output_key(pprt, flp, flags);
1183 if (err == 0 && flp->proto) {
1184 err = xfrm_lookup(&init_net, pprt, flp, NULL, 0);
1185 }
1186 return err;
1187 }
1188
1189 int dn_route_output_sock(struct dst_entry **pprt, struct flowi *fl, struct sock *sk, int flags)
1190 {
1191 int err;
1192
1193 err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD);
1194 if (err == 0 && fl->proto) {
1195 err = xfrm_lookup(&init_net, pprt, fl, sk,
1196 (flags & MSG_DONTWAIT) ? 0 : XFRM_LOOKUP_WAIT);
1197 }
1198 return err;
1199 }
1200
1201 static int dn_route_input_slow(struct sk_buff *skb)
1202 {
1203 struct dn_route *rt = NULL;
1204 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1205 struct net_device *in_dev = skb->dev;
1206 struct net_device *out_dev = NULL;
1207 struct dn_dev *dn_db;
1208 struct neighbour *neigh = NULL;
1209 unsigned hash;
1210 int flags = 0;
1211 __le16 gateway = 0;
1212 __le16 local_src = 0;
1213 struct flowi fl = { .nl_u = { .dn_u =
1214 { .daddr = cb->dst,
1215 .saddr = cb->src,
1216 .scope = RT_SCOPE_UNIVERSE,
1217 } },
1218 .mark = skb->mark,
1219 .iif = skb->dev->ifindex };
1220 struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE };
1221 int err = -EINVAL;
1222 int free_res = 0;
1223
1224 dev_hold(in_dev);
1225
1226 if ((dn_db = in_dev->dn_ptr) == NULL)
1227 goto out;
1228
1229 /* Zero source addresses are not allowed */
1230 if (fl.fld_src == 0)
1231 goto out;
1232
1233 /*
1234 * In this case we've just received a packet from a source
1235 * outside ourselves pretending to come from us. We don't
1236 * allow it any further to prevent routing loops, spoofing and
1237 * other nasties. Loopback packets already have the dst attached
1238 * so this only affects packets which have originated elsewhere.
1239 */
1240 err = -ENOTUNIQ;
1241 if (dn_dev_islocal(in_dev, cb->src))
1242 goto out;
1243
1244 err = dn_fib_lookup(&fl, &res);
1245 if (err) {
1246 if (err != -ESRCH)
1247 goto out;
1248 /*
1249 * Is the destination us ?
1250 */
1251 if (!dn_dev_islocal(in_dev, cb->dst))
1252 goto e_inval;
1253
1254 res.type = RTN_LOCAL;
1255 } else {
1256 __le16 src_map = fl.fld_src;
1257 free_res = 1;
1258
1259 out_dev = DN_FIB_RES_DEV(res);
1260 if (out_dev == NULL) {
1261 if (net_ratelimit())
1262 printk(KERN_CRIT "Bug in dn_route_input_slow() "
1263 "No output device\n");
1264 goto e_inval;
1265 }
1266 dev_hold(out_dev);
1267
1268 if (res.r)
1269 src_map = fl.fld_src; /* no NAT support for now */
1270
1271 gateway = DN_FIB_RES_GW(res);
1272 if (res.type == RTN_NAT) {
1273 fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res);
1274 dn_fib_res_put(&res);
1275 free_res = 0;
1276 if (dn_fib_lookup(&fl, &res))
1277 goto e_inval;
1278 free_res = 1;
1279 if (res.type != RTN_UNICAST)
1280 goto e_inval;
1281 flags |= RTCF_DNAT;
1282 gateway = fl.fld_dst;
1283 }
1284 fl.fld_src = src_map;
1285 }
1286
1287 switch(res.type) {
1288 case RTN_UNICAST:
1289 /*
1290 * Forwarding check here, we only check for forwarding
1291 * being turned off, if you want to only forward intra
1292 * area, its up to you to set the routing tables up
1293 * correctly.
1294 */
1295 if (dn_db->parms.forwarding == 0)
1296 goto e_inval;
1297
1298 if (res.fi->fib_nhs > 1 && fl.oif == 0)
1299 dn_fib_select_multipath(&fl, &res);
1300
1301 /*
1302 * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT
1303 * flag as a hint to set the intra-ethernet bit when
1304 * forwarding. If we've got NAT in operation, we don't do
1305 * this optimisation.
1306 */
1307 if (out_dev == in_dev && !(flags & RTCF_NAT))
1308 flags |= RTCF_DOREDIRECT;
1309
1310 local_src = DN_FIB_RES_PREFSRC(res);
1311
1312 case RTN_BLACKHOLE:
1313 case RTN_UNREACHABLE:
1314 break;
1315 case RTN_LOCAL:
1316 flags |= RTCF_LOCAL;
1317 fl.fld_src = cb->dst;
1318 fl.fld_dst = cb->src;
1319
1320 /* Routing tables gave us a gateway */
1321 if (gateway)
1322 goto make_route;
1323
1324 /* Packet was intra-ethernet, so we know its on-link */
1325 if (cb->rt_flags & DN_RT_F_IE) {
1326 gateway = cb->src;
1327 flags |= RTCF_DIRECTSRC;
1328 goto make_route;
1329 }
1330
1331 /* Use the default router if there is one */
1332 neigh = neigh_clone(dn_db->router);
1333 if (neigh) {
1334 gateway = ((struct dn_neigh *)neigh)->addr;
1335 goto make_route;
1336 }
1337
1338 /* Close eyes and pray */
1339 gateway = cb->src;
1340 flags |= RTCF_DIRECTSRC;
1341 goto make_route;
1342 default:
1343 goto e_inval;
1344 }
1345
1346 make_route:
1347 rt = dst_alloc(&dn_dst_ops);
1348 if (rt == NULL)
1349 goto e_nobufs;
1350
1351 rt->rt_saddr = fl.fld_src;
1352 rt->rt_daddr = fl.fld_dst;
1353 rt->rt_gateway = fl.fld_dst;
1354 if (gateway)
1355 rt->rt_gateway = gateway;
1356 rt->rt_local_src = local_src ? local_src : rt->rt_saddr;
1357
1358 rt->rt_dst_map = fl.fld_dst;
1359 rt->rt_src_map = fl.fld_src;
1360
1361 rt->fl.fld_src = cb->src;
1362 rt->fl.fld_dst = cb->dst;
1363 rt->fl.oif = 0;
1364 rt->fl.iif = in_dev->ifindex;
1365 rt->fl.mark = fl.mark;
1366
1367 rt->u.dst.flags = DST_HOST;
1368 rt->u.dst.neighbour = neigh;
1369 rt->u.dst.dev = out_dev;
1370 rt->u.dst.lastuse = jiffies;
1371 rt->u.dst.output = dn_rt_bug;
1372 switch(res.type) {
1373 case RTN_UNICAST:
1374 rt->u.dst.input = dn_forward;
1375 break;
1376 case RTN_LOCAL:
1377 rt->u.dst.output = dn_output;
1378 rt->u.dst.input = dn_nsp_rx;
1379 rt->u.dst.dev = in_dev;
1380 flags |= RTCF_LOCAL;
1381 break;
1382 default:
1383 case RTN_UNREACHABLE:
1384 case RTN_BLACKHOLE:
1385 rt->u.dst.input = dst_discard;
1386 }
1387 rt->rt_flags = flags;
1388 if (rt->u.dst.dev)
1389 dev_hold(rt->u.dst.dev);
1390
1391 err = dn_rt_set_next_hop(rt, &res);
1392 if (err)
1393 goto e_neighbour;
1394
1395 hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst);
1396 dn_insert_route(rt, hash, &rt);
1397 skb_dst_set(skb, &rt->u.dst);
1398
1399 done:
1400 if (neigh)
1401 neigh_release(neigh);
1402 if (free_res)
1403 dn_fib_res_put(&res);
1404 dev_put(in_dev);
1405 if (out_dev)
1406 dev_put(out_dev);
1407 out:
1408 return err;
1409
1410 e_inval:
1411 err = -EINVAL;
1412 goto done;
1413
1414 e_nobufs:
1415 err = -ENOBUFS;
1416 goto done;
1417
1418 e_neighbour:
1419 dst_free(&rt->u.dst);
1420 goto done;
1421 }
1422
1423 static int dn_route_input(struct sk_buff *skb)
1424 {
1425 struct dn_route *rt;
1426 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1427 unsigned hash = dn_hash(cb->src, cb->dst);
1428
1429 if (skb_dst(skb))
1430 return 0;
1431
1432 rcu_read_lock();
1433 for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL;
1434 rt = rcu_dereference(rt->u.dst.dn_next)) {
1435 if ((rt->fl.fld_src == cb->src) &&
1436 (rt->fl.fld_dst == cb->dst) &&
1437 (rt->fl.oif == 0) &&
1438 (rt->fl.mark == skb->mark) &&
1439 (rt->fl.iif == cb->iif)) {
1440 dst_use(&rt->u.dst, jiffies);
1441 rcu_read_unlock();
1442 skb_dst_set(skb, (struct dst_entry *)rt);
1443 return 0;
1444 }
1445 }
1446 rcu_read_unlock();
1447
1448 return dn_route_input_slow(skb);
1449 }
1450
1451 static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1452 int event, int nowait, unsigned int flags)
1453 {
1454 struct dn_route *rt = (struct dn_route *)skb_dst(skb);
1455 struct rtmsg *r;
1456 struct nlmsghdr *nlh;
1457 unsigned char *b = skb_tail_pointer(skb);
1458 long expires;
1459
1460 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
1461 r = NLMSG_DATA(nlh);
1462 r->rtm_family = AF_DECnet;
1463 r->rtm_dst_len = 16;
1464 r->rtm_src_len = 0;
1465 r->rtm_tos = 0;
1466 r->rtm_table = RT_TABLE_MAIN;
1467 RTA_PUT_U32(skb, RTA_TABLE, RT_TABLE_MAIN);
1468 r->rtm_type = rt->rt_type;
1469 r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
1470 r->rtm_scope = RT_SCOPE_UNIVERSE;
1471 r->rtm_protocol = RTPROT_UNSPEC;
1472 if (rt->rt_flags & RTCF_NOTIFY)
1473 r->rtm_flags |= RTM_F_NOTIFY;
1474 RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr);
1475 if (rt->fl.fld_src) {
1476 r->rtm_src_len = 16;
1477 RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src);
1478 }
1479 if (rt->u.dst.dev)
1480 RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex);
1481 /*
1482 * Note to self - change this if input routes reverse direction when
1483 * they deal only with inputs and not with replies like they do
1484 * currently.
1485 */
1486 RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src);
1487 if (rt->rt_daddr != rt->rt_gateway)
1488 RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway);
1489 if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
1490 goto rtattr_failure;
1491 expires = rt->u.dst.expires ? rt->u.dst.expires - jiffies : 0;
1492 if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, expires,
1493 rt->u.dst.error) < 0)
1494 goto rtattr_failure;
1495 if (rt->fl.iif)
1496 RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif);
1497
1498 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1499 return skb->len;
1500
1501 nlmsg_failure:
1502 rtattr_failure:
1503 nlmsg_trim(skb, b);
1504 return -1;
1505 }
1506
1507 /*
1508 * This is called by both endnodes and routers now.
1509 */
1510 static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg)
1511 {
1512 struct net *net = sock_net(in_skb->sk);
1513 struct rtattr **rta = arg;
1514 struct rtmsg *rtm = NLMSG_DATA(nlh);
1515 struct dn_route *rt = NULL;
1516 struct dn_skb_cb *cb;
1517 int err;
1518 struct sk_buff *skb;
1519 struct flowi fl;
1520
1521 if (!net_eq(net, &init_net))
1522 return -EINVAL;
1523
1524 memset(&fl, 0, sizeof(fl));
1525 fl.proto = DNPROTO_NSP;
1526
1527 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1528 if (skb == NULL)
1529 return -ENOBUFS;
1530 skb_reset_mac_header(skb);
1531 cb = DN_SKB_CB(skb);
1532
1533 if (rta[RTA_SRC-1])
1534 memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2);
1535 if (rta[RTA_DST-1])
1536 memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2);
1537 if (rta[RTA_IIF-1])
1538 memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
1539
1540 if (fl.iif) {
1541 struct net_device *dev;
1542 if ((dev = dev_get_by_index(&init_net, fl.iif)) == NULL) {
1543 kfree_skb(skb);
1544 return -ENODEV;
1545 }
1546 if (!dev->dn_ptr) {
1547 dev_put(dev);
1548 kfree_skb(skb);
1549 return -ENODEV;
1550 }
1551 skb->protocol = htons(ETH_P_DNA_RT);
1552 skb->dev = dev;
1553 cb->src = fl.fld_src;
1554 cb->dst = fl.fld_dst;
1555 local_bh_disable();
1556 err = dn_route_input(skb);
1557 local_bh_enable();
1558 memset(cb, 0, sizeof(struct dn_skb_cb));
1559 rt = (struct dn_route *)skb_dst(skb);
1560 if (!err && -rt->u.dst.error)
1561 err = rt->u.dst.error;
1562 } else {
1563 int oif = 0;
1564 if (rta[RTA_OIF - 1])
1565 memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int));
1566 fl.oif = oif;
1567 err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0);
1568 }
1569
1570 if (skb->dev)
1571 dev_put(skb->dev);
1572 skb->dev = NULL;
1573 if (err)
1574 goto out_free;
1575 skb_dst_set(skb, &rt->u.dst);
1576 if (rtm->rtm_flags & RTM_F_NOTIFY)
1577 rt->rt_flags |= RTCF_NOTIFY;
1578
1579 err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0);
1580
1581 if (err == 0)
1582 goto out_free;
1583 if (err < 0) {
1584 err = -EMSGSIZE;
1585 goto out_free;
1586 }
1587
1588 return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
1589
1590 out_free:
1591 kfree_skb(skb);
1592 return err;
1593 }
1594
1595 /*
1596 * For routers, this is called from dn_fib_dump, but for endnodes its
1597 * called directly from the rtnetlink dispatch table.
1598 */
1599 int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb)
1600 {
1601 struct net *net = sock_net(skb->sk);
1602 struct dn_route *rt;
1603 int h, s_h;
1604 int idx, s_idx;
1605
1606 if (!net_eq(net, &init_net))
1607 return 0;
1608
1609 if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg))
1610 return -EINVAL;
1611 if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED))
1612 return 0;
1613
1614 s_h = cb->args[0];
1615 s_idx = idx = cb->args[1];
1616 for(h = 0; h <= dn_rt_hash_mask; h++) {
1617 if (h < s_h)
1618 continue;
1619 if (h > s_h)
1620 s_idx = 0;
1621 rcu_read_lock_bh();
1622 for(rt = rcu_dereference_bh(dn_rt_hash_table[h].chain), idx = 0;
1623 rt;
1624 rt = rcu_dereference_bh(rt->u.dst.dn_next), idx++) {
1625 if (idx < s_idx)
1626 continue;
1627 skb_dst_set(skb, dst_clone(&rt->u.dst));
1628 if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid,
1629 cb->nlh->nlmsg_seq, RTM_NEWROUTE,
1630 1, NLM_F_MULTI) <= 0) {
1631 skb_dst_drop(skb);
1632 rcu_read_unlock_bh();
1633 goto done;
1634 }
1635 skb_dst_drop(skb);
1636 }
1637 rcu_read_unlock_bh();
1638 }
1639
1640 done:
1641 cb->args[0] = h;
1642 cb->args[1] = idx;
1643 return skb->len;
1644 }
1645
1646 #ifdef CONFIG_PROC_FS
1647 struct dn_rt_cache_iter_state {
1648 int bucket;
1649 };
1650
1651 static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq)
1652 {
1653 struct dn_route *rt = NULL;
1654 struct dn_rt_cache_iter_state *s = seq->private;
1655
1656 for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) {
1657 rcu_read_lock_bh();
1658 rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain);
1659 if (rt)
1660 break;
1661 rcu_read_unlock_bh();
1662 }
1663 return rt;
1664 }
1665
1666 static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt)
1667 {
1668 struct dn_rt_cache_iter_state *s = seq->private;
1669
1670 rt = rt->u.dst.dn_next;
1671 while(!rt) {
1672 rcu_read_unlock_bh();
1673 if (--s->bucket < 0)
1674 break;
1675 rcu_read_lock_bh();
1676 rt = dn_rt_hash_table[s->bucket].chain;
1677 }
1678 return rcu_dereference_bh(rt);
1679 }
1680
1681 static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
1682 {
1683 struct dn_route *rt = dn_rt_cache_get_first(seq);
1684
1685 if (rt) {
1686 while(*pos && (rt = dn_rt_cache_get_next(seq, rt)))
1687 --*pos;
1688 }
1689 return *pos ? NULL : rt;
1690 }
1691
1692 static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1693 {
1694 struct dn_route *rt = dn_rt_cache_get_next(seq, v);
1695 ++*pos;
1696 return rt;
1697 }
1698
1699 static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v)
1700 {
1701 if (v)
1702 rcu_read_unlock_bh();
1703 }
1704
1705 static int dn_rt_cache_seq_show(struct seq_file *seq, void *v)
1706 {
1707 struct dn_route *rt = v;
1708 char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN];
1709
1710 seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n",
1711 rt->u.dst.dev ? rt->u.dst.dev->name : "*",
1712 dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1),
1713 dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2),
1714 atomic_read(&rt->u.dst.__refcnt),
1715 rt->u.dst.__use,
1716 (int) dst_metric(&rt->u.dst, RTAX_RTT));
1717 return 0;
1718 }
1719
1720 static const struct seq_operations dn_rt_cache_seq_ops = {
1721 .start = dn_rt_cache_seq_start,
1722 .next = dn_rt_cache_seq_next,
1723 .stop = dn_rt_cache_seq_stop,
1724 .show = dn_rt_cache_seq_show,
1725 };
1726
1727 static int dn_rt_cache_seq_open(struct inode *inode, struct file *file)
1728 {
1729 return seq_open_private(file, &dn_rt_cache_seq_ops,
1730 sizeof(struct dn_rt_cache_iter_state));
1731 }
1732
1733 static const struct file_operations dn_rt_cache_seq_fops = {
1734 .owner = THIS_MODULE,
1735 .open = dn_rt_cache_seq_open,
1736 .read = seq_read,
1737 .llseek = seq_lseek,
1738 .release = seq_release_private,
1739 };
1740
1741 #endif /* CONFIG_PROC_FS */
1742
1743 void __init dn_route_init(void)
1744 {
1745 int i, goal, order;
1746
1747 dn_dst_ops.kmem_cachep =
1748 kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0,
1749 SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
1750 setup_timer(&dn_route_timer, dn_dst_check_expire, 0);
1751 dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
1752 add_timer(&dn_route_timer);
1753
1754 goal = totalram_pages >> (26 - PAGE_SHIFT);
1755
1756 for(order = 0; (1UL << order) < goal; order++)
1757 /* NOTHING */;
1758
1759 /*
1760 * Only want 1024 entries max, since the table is very, very unlikely
1761 * to be larger than that.
1762 */
1763 while(order && ((((1UL << order) * PAGE_SIZE) /
1764 sizeof(struct dn_rt_hash_bucket)) >= 2048))
1765 order--;
1766
1767 do {
1768 dn_rt_hash_mask = (1UL << order) * PAGE_SIZE /
1769 sizeof(struct dn_rt_hash_bucket);
1770 while(dn_rt_hash_mask & (dn_rt_hash_mask - 1))
1771 dn_rt_hash_mask--;
1772 dn_rt_hash_table = (struct dn_rt_hash_bucket *)
1773 __get_free_pages(GFP_ATOMIC, order);
1774 } while (dn_rt_hash_table == NULL && --order > 0);
1775
1776 if (!dn_rt_hash_table)
1777 panic("Failed to allocate DECnet route cache hash table\n");
1778
1779 printk(KERN_INFO
1780 "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n",
1781 dn_rt_hash_mask,
1782 (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024);
1783
1784 dn_rt_hash_mask--;
1785 for(i = 0; i <= dn_rt_hash_mask; i++) {
1786 spin_lock_init(&dn_rt_hash_table[i].lock);
1787 dn_rt_hash_table[i].chain = NULL;
1788 }
1789
1790 dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1);
1791
1792 proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops);
1793
1794 #ifdef CONFIG_DECNET_ROUTER
1795 rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, dn_fib_dump);
1796 #else
1797 rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute,
1798 dn_cache_dump);
1799 #endif
1800 }
1801
1802 void __exit dn_route_cleanup(void)
1803 {
1804 del_timer(&dn_route_timer);
1805 dn_run_flush(0);
1806
1807 proc_net_remove(&init_net, "decnet_cache");
1808 }
1809
kernel source for telekom puls (alcatel/mediatek)