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Merge branch 'core/locking'
[linux-2.6/x86.git] / net / decnet / dn_table.c
blobbd0a52dd1d40e65c2c6d905172cb4fc957dd3264
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 Forwarding Information Base (Routing Tables)
7 *
8 * Author: Steve Whitehouse <SteveW@ACM.org>
9 * Mostly copied from the IPv4 routing code
10 *
11 *
12 * Changes:
13 *
14 */
15 #include <linux/string.h>
16 #include <linux/net.h>
17 #include <linux/socket.h>
18 #include <linux/slab.h>
19 #include <linux/sockios.h>
20 #include <linux/init.h>
21 #include <linux/skbuff.h>
22 #include <linux/netlink.h>
23 #include <linux/rtnetlink.h>
24 #include <linux/proc_fs.h>
25 #include <linux/netdevice.h>
26 #include <linux/timer.h>
27 #include <linux/spinlock.h>
28 #include <asm/atomic.h>
29 #include <asm/uaccess.h>
30 #include <linux/route.h> /* RTF_xxx */
31 #include <net/neighbour.h>
32 #include <net/netlink.h>
33 #include <net/dst.h>
34 #include <net/flow.h>
35 #include <net/fib_rules.h>
36 #include <net/dn.h>
37 #include <net/dn_route.h>
38 #include <net/dn_fib.h>
39 #include <net/dn_neigh.h>
40 #include <net/dn_dev.h>
41
42 struct dn_zone
43 {
44 struct dn_zone *dz_next;
45 struct dn_fib_node **dz_hash;
46 int dz_nent;
47 int dz_divisor;
48 u32 dz_hashmask;
49 #define DZ_HASHMASK(dz) ((dz)->dz_hashmask)
50 int dz_order;
51 __le16 dz_mask;
52 #define DZ_MASK(dz) ((dz)->dz_mask)
53 };
54
55 struct dn_hash
56 {
57 struct dn_zone *dh_zones[17];
58 struct dn_zone *dh_zone_list;
59 };
60
61 #define dz_key_0(key) ((key).datum = 0)
62
63 #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
64 for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
65
66 #define endfor_nexthops(fi) }
67
68 #define DN_MAX_DIVISOR 1024
69 #define DN_S_ZOMBIE 1
70 #define DN_S_ACCESSED 2
71
72 #define DN_FIB_SCAN(f, fp) \
73 for( ; ((f) = *(fp)) != NULL; (fp) = &(f)->fn_next)
74
75 #define DN_FIB_SCAN_KEY(f, fp, key) \
76 for( ; ((f) = *(fp)) != NULL && dn_key_eq((f)->fn_key, (key)); (fp) = &(f)->fn_next)
77
78 #define RT_TABLE_MIN 1
79 #define DN_FIB_TABLE_HASHSZ 256
80 static struct hlist_head dn_fib_table_hash[DN_FIB_TABLE_HASHSZ];
81 static DEFINE_RWLOCK(dn_fib_tables_lock);
82
83 static struct kmem_cache *dn_hash_kmem __read_mostly;
84 static int dn_fib_hash_zombies;
85
86 static inline dn_fib_idx_t dn_hash(dn_fib_key_t key, struct dn_zone *dz)
87 {
88 u16 h = le16_to_cpu(key.datum)>>(16 - dz->dz_order);
89 h ^= (h >> 10);
90 h ^= (h >> 6);
91 h &= DZ_HASHMASK(dz);
92 return *(dn_fib_idx_t *)&h;
93 }
94
95 static inline dn_fib_key_t dz_key(__le16 dst, struct dn_zone *dz)
96 {
97 dn_fib_key_t k;
98 k.datum = dst & DZ_MASK(dz);
99 return k;
100 }
101
102 static inline struct dn_fib_node **dn_chain_p(dn_fib_key_t key, struct dn_zone *dz)
103 {
104 return &dz->dz_hash[dn_hash(key, dz).datum];
105 }
106
107 static inline struct dn_fib_node *dz_chain(dn_fib_key_t key, struct dn_zone *dz)
108 {
109 return dz->dz_hash[dn_hash(key, dz).datum];
110 }
111
112 static inline int dn_key_eq(dn_fib_key_t a, dn_fib_key_t b)
113 {
114 return a.datum == b.datum;
115 }
116
117 static inline int dn_key_leq(dn_fib_key_t a, dn_fib_key_t b)
118 {
119 return a.datum <= b.datum;
120 }
121
122 static inline void dn_rebuild_zone(struct dn_zone *dz,
123 struct dn_fib_node **old_ht,
124 int old_divisor)
125 {
126 struct dn_fib_node *f, **fp, *next;
127 int i;
128
129 for(i = 0; i < old_divisor; i++) {
130 for(f = old_ht[i]; f; f = next) {
131 next = f->fn_next;
132 for(fp = dn_chain_p(f->fn_key, dz);
133 *fp && dn_key_leq((*fp)->fn_key, f->fn_key);
134 fp = &(*fp)->fn_next)
135 /* NOTHING */;
136 f->fn_next = *fp;
137 *fp = f;
138 }
139 }
140 }
141
142 static void dn_rehash_zone(struct dn_zone *dz)
143 {
144 struct dn_fib_node **ht, **old_ht;
145 int old_divisor, new_divisor;
146 u32 new_hashmask;
147
148 old_divisor = dz->dz_divisor;
149
150 switch(old_divisor) {
151 case 16:
152 new_divisor = 256;
153 new_hashmask = 0xFF;
154 break;
155 default:
156 printk(KERN_DEBUG "DECnet: dn_rehash_zone: BUG! %d\n", old_divisor);
157 case 256:
158 new_divisor = 1024;
159 new_hashmask = 0x3FF;
160 break;
161 }
162
163 ht = kcalloc(new_divisor, sizeof(struct dn_fib_node*), GFP_KERNEL);
164 if (ht == NULL)
165 return;
166
167 write_lock_bh(&dn_fib_tables_lock);
168 old_ht = dz->dz_hash;
169 dz->dz_hash = ht;
170 dz->dz_hashmask = new_hashmask;
171 dz->dz_divisor = new_divisor;
172 dn_rebuild_zone(dz, old_ht, old_divisor);
173 write_unlock_bh(&dn_fib_tables_lock);
174 kfree(old_ht);
175 }
176
177 static void dn_free_node(struct dn_fib_node *f)
178 {
179 dn_fib_release_info(DN_FIB_INFO(f));
180 kmem_cache_free(dn_hash_kmem, f);
181 }
182
183
184 static struct dn_zone *dn_new_zone(struct dn_hash *table, int z)
185 {
186 int i;
187 struct dn_zone *dz = kzalloc(sizeof(struct dn_zone), GFP_KERNEL);
188 if (!dz)
189 return NULL;
190
191 if (z) {
192 dz->dz_divisor = 16;
193 dz->dz_hashmask = 0x0F;
194 } else {
195 dz->dz_divisor = 1;
196 dz->dz_hashmask = 0;
197 }
198
199 dz->dz_hash = kcalloc(dz->dz_divisor, sizeof(struct dn_fib_node *), GFP_KERNEL);
200 if (!dz->dz_hash) {
201 kfree(dz);
202 return NULL;
203 }
204
205 dz->dz_order = z;
206 dz->dz_mask = dnet_make_mask(z);
207
208 for(i = z + 1; i <= 16; i++)
209 if (table->dh_zones[i])
210 break;
211
212 write_lock_bh(&dn_fib_tables_lock);
213 if (i>16) {
214 dz->dz_next = table->dh_zone_list;
215 table->dh_zone_list = dz;
216 } else {
217 dz->dz_next = table->dh_zones[i]->dz_next;
218 table->dh_zones[i]->dz_next = dz;
219 }
220 table->dh_zones[z] = dz;
221 write_unlock_bh(&dn_fib_tables_lock);
222 return dz;
223 }
224
225
226 static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct dn_kern_rta *rta, struct dn_fib_info *fi)
227 {
228 struct rtnexthop *nhp;
229 int nhlen;
230
231 if (rta->rta_priority && *rta->rta_priority != fi->fib_priority)
232 return 1;
233
234 if (rta->rta_oif || rta->rta_gw) {
235 if ((!rta->rta_oif || *rta->rta_oif == fi->fib_nh->nh_oif) &&
236 (!rta->rta_gw || memcmp(rta->rta_gw, &fi->fib_nh->nh_gw, 2) == 0))
237 return 0;
238 return 1;
239 }
240
241 if (rta->rta_mp == NULL)
242 return 0;
243
244 nhp = RTA_DATA(rta->rta_mp);
245 nhlen = RTA_PAYLOAD(rta->rta_mp);
246
247 for_nexthops(fi) {
248 int attrlen = nhlen - sizeof(struct rtnexthop);
249 __le16 gw;
250
251 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
252 return -EINVAL;
253 if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif)
254 return 1;
255 if (attrlen) {
256 gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
257
258 if (gw && gw != nh->nh_gw)
259 return 1;
260 }
261 nhp = RTNH_NEXT(nhp);
262 } endfor_nexthops(fi);
263
264 return 0;
265 }
266
267 static inline size_t dn_fib_nlmsg_size(struct dn_fib_info *fi)
268 {
269 size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg))
270 + nla_total_size(4) /* RTA_TABLE */
271 + nla_total_size(2) /* RTA_DST */
272 + nla_total_size(4); /* RTA_PRIORITY */
273
274 /* space for nested metrics */
275 payload += nla_total_size((RTAX_MAX * nla_total_size(4)));
276
277 if (fi->fib_nhs) {
278 /* Also handles the special case fib_nhs == 1 */
279
280 /* each nexthop is packed in an attribute */
281 size_t nhsize = nla_total_size(sizeof(struct rtnexthop));
282
283 /* may contain a gateway attribute */
284 nhsize += nla_total_size(4);
285
286 /* all nexthops are packed in a nested attribute */
287 payload += nla_total_size(fi->fib_nhs * nhsize);
288 }
289
290 return payload;
291 }
292
293 static int dn_fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
294 u32 tb_id, u8 type, u8 scope, void *dst, int dst_len,
295 struct dn_fib_info *fi, unsigned int flags)
296 {
297 struct rtmsg *rtm;
298 struct nlmsghdr *nlh;
299 unsigned char *b = skb_tail_pointer(skb);
300
301 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*rtm), flags);
302 rtm = NLMSG_DATA(nlh);
303 rtm->rtm_family = AF_DECnet;
304 rtm->rtm_dst_len = dst_len;
305 rtm->rtm_src_len = 0;
306 rtm->rtm_tos = 0;
307 rtm->rtm_table = tb_id;
308 RTA_PUT_U32(skb, RTA_TABLE, tb_id);
309 rtm->rtm_flags = fi->fib_flags;
310 rtm->rtm_scope = scope;
311 rtm->rtm_type = type;
312 if (rtm->rtm_dst_len)
313 RTA_PUT(skb, RTA_DST, 2, dst);
314 rtm->rtm_protocol = fi->fib_protocol;
315 if (fi->fib_priority)
316 RTA_PUT(skb, RTA_PRIORITY, 4, &fi->fib_priority);
317 if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0)
318 goto rtattr_failure;
319 if (fi->fib_nhs == 1) {
320 if (fi->fib_nh->nh_gw)
321 RTA_PUT(skb, RTA_GATEWAY, 2, &fi->fib_nh->nh_gw);
322 if (fi->fib_nh->nh_oif)
323 RTA_PUT(skb, RTA_OIF, sizeof(int), &fi->fib_nh->nh_oif);
324 }
325 if (fi->fib_nhs > 1) {
326 struct rtnexthop *nhp;
327 struct rtattr *mp_head;
328 if (skb_tailroom(skb) <= RTA_SPACE(0))
329 goto rtattr_failure;
330 mp_head = (struct rtattr *)skb_put(skb, RTA_SPACE(0));
331
332 for_nexthops(fi) {
333 if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
334 goto rtattr_failure;
335 nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
336 nhp->rtnh_flags = nh->nh_flags & 0xFF;
337 nhp->rtnh_hops = nh->nh_weight - 1;
338 nhp->rtnh_ifindex = nh->nh_oif;
339 if (nh->nh_gw)
340 RTA_PUT(skb, RTA_GATEWAY, 2, &nh->nh_gw);
341 nhp->rtnh_len = skb_tail_pointer(skb) - (unsigned char *)nhp;
342 } endfor_nexthops(fi);
343 mp_head->rta_type = RTA_MULTIPATH;
344 mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head;
345 }
346
347 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
348 return skb->len;
349
350
351 nlmsg_failure:
352 rtattr_failure:
353 nlmsg_trim(skb, b);
354 return -EMSGSIZE;
355 }
356
357
358 static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, u32 tb_id,
359 struct nlmsghdr *nlh, struct netlink_skb_parms *req)
360 {
361 struct sk_buff *skb;
362 u32 pid = req ? req->pid : 0;
363 int err = -ENOBUFS;
364
365 skb = nlmsg_new(dn_fib_nlmsg_size(DN_FIB_INFO(f)), GFP_KERNEL);
366 if (skb == NULL)
367 goto errout;
368
369 err = dn_fib_dump_info(skb, pid, nlh->nlmsg_seq, event, tb_id,
370 f->fn_type, f->fn_scope, &f->fn_key, z,
371 DN_FIB_INFO(f), 0);
372 if (err < 0) {
373 /* -EMSGSIZE implies BUG in dn_fib_nlmsg_size() */
374 WARN_ON(err == -EMSGSIZE);
375 kfree_skb(skb);
376 goto errout;
377 }
378 rtnl_notify(skb, &init_net, pid, RTNLGRP_DECnet_ROUTE, nlh, GFP_KERNEL);
379 return;
380 errout:
381 if (err < 0)
382 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_ROUTE, err);
383 }
384
385 static __inline__ int dn_hash_dump_bucket(struct sk_buff *skb,
386 struct netlink_callback *cb,
387 struct dn_fib_table *tb,
388 struct dn_zone *dz,
389 struct dn_fib_node *f)
390 {
391 int i, s_i;
392
393 s_i = cb->args[4];
394 for(i = 0; f; i++, f = f->fn_next) {
395 if (i < s_i)
396 continue;
397 if (f->fn_state & DN_S_ZOMBIE)
398 continue;
399 if (dn_fib_dump_info(skb, NETLINK_CB(cb->skb).pid,
400 cb->nlh->nlmsg_seq,
401 RTM_NEWROUTE,
402 tb->n,
403 (f->fn_state & DN_S_ZOMBIE) ? 0 : f->fn_type,
404 f->fn_scope, &f->fn_key, dz->dz_order,
405 f->fn_info, NLM_F_MULTI) < 0) {
406 cb->args[4] = i;
407 return -1;
408 }
409 }
410 cb->args[4] = i;
411 return skb->len;
412 }
413
414 static __inline__ int dn_hash_dump_zone(struct sk_buff *skb,
415 struct netlink_callback *cb,
416 struct dn_fib_table *tb,
417 struct dn_zone *dz)
418 {
419 int h, s_h;
420
421 s_h = cb->args[3];
422 for(h = 0; h < dz->dz_divisor; h++) {
423 if (h < s_h)
424 continue;
425 if (h > s_h)
426 memset(&cb->args[4], 0, sizeof(cb->args) - 4*sizeof(cb->args[0]));
427 if (dz->dz_hash == NULL || dz->dz_hash[h] == NULL)
428 continue;
429 if (dn_hash_dump_bucket(skb, cb, tb, dz, dz->dz_hash[h]) < 0) {
430 cb->args[3] = h;
431 return -1;
432 }
433 }
434 cb->args[3] = h;
435 return skb->len;
436 }
437
438 static int dn_fib_table_dump(struct dn_fib_table *tb, struct sk_buff *skb,
439 struct netlink_callback *cb)
440 {
441 int m, s_m;
442 struct dn_zone *dz;
443 struct dn_hash *table = (struct dn_hash *)tb->data;
444
445 s_m = cb->args[2];
446 read_lock(&dn_fib_tables_lock);
447 for(dz = table->dh_zone_list, m = 0; dz; dz = dz->dz_next, m++) {
448 if (m < s_m)
449 continue;
450 if (m > s_m)
451 memset(&cb->args[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0]));
452
453 if (dn_hash_dump_zone(skb, cb, tb, dz) < 0) {
454 cb->args[2] = m;
455 read_unlock(&dn_fib_tables_lock);
456 return -1;
457 }
458 }
459 read_unlock(&dn_fib_tables_lock);
460 cb->args[2] = m;
461
462 return skb->len;
463 }
464
465 int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb)
466 {
467 struct net *net = sock_net(skb->sk);
468 unsigned int h, s_h;
469 unsigned int e = 0, s_e;
470 struct dn_fib_table *tb;
471 struct hlist_node *node;
472 int dumped = 0;
473
474 if (!net_eq(net, &init_net))
475 return 0;
476
477 if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) &&
478 ((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)
479 return dn_cache_dump(skb, cb);
480
481 s_h = cb->args[0];
482 s_e = cb->args[1];
483
484 for (h = s_h; h < DN_FIB_TABLE_HASHSZ; h++, s_h = 0) {
485 e = 0;
486 hlist_for_each_entry(tb, node, &dn_fib_table_hash[h], hlist) {
487 if (e < s_e)
488 goto next;
489 if (dumped)
490 memset(&cb->args[2], 0, sizeof(cb->args) -
491 2 * sizeof(cb->args[0]));
492 if (tb->dump(tb, skb, cb) < 0)
493 goto out;
494 dumped = 1;
495 next:
496 e++;
497 }
498 }
499 out:
500 cb->args[1] = e;
501 cb->args[0] = h;
502
503 return skb->len;
504 }
505
506 static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
507 {
508 struct dn_hash *table = (struct dn_hash *)tb->data;
509 struct dn_fib_node *new_f, *f, **fp, **del_fp;
510 struct dn_zone *dz;
511 struct dn_fib_info *fi;
512 int z = r->rtm_dst_len;
513 int type = r->rtm_type;
514 dn_fib_key_t key;
515 int err;
516
517 if (z > 16)
518 return -EINVAL;
519
520 dz = table->dh_zones[z];
521 if (!dz && !(dz = dn_new_zone(table, z)))
522 return -ENOBUFS;
523
524 dz_key_0(key);
525 if (rta->rta_dst) {
526 __le16 dst;
527 memcpy(&dst, rta->rta_dst, 2);
528 if (dst & ~DZ_MASK(dz))
529 return -EINVAL;
530 key = dz_key(dst, dz);
531 }
532
533 if ((fi = dn_fib_create_info(r, rta, n, &err)) == NULL)
534 return err;
535
536 if (dz->dz_nent > (dz->dz_divisor << 2) &&
537 dz->dz_divisor > DN_MAX_DIVISOR &&
538 (z==16 || (1<<z) > dz->dz_divisor))
539 dn_rehash_zone(dz);
540
541 fp = dn_chain_p(key, dz);
542
543 DN_FIB_SCAN(f, fp) {
544 if (dn_key_leq(key, f->fn_key))
545 break;
546 }
547
548 del_fp = NULL;
549
550 if (f && (f->fn_state & DN_S_ZOMBIE) &&
551 dn_key_eq(f->fn_key, key)) {
552 del_fp = fp;
553 fp = &f->fn_next;
554 f = *fp;
555 goto create;
556 }
557
558 DN_FIB_SCAN_KEY(f, fp, key) {
559 if (fi->fib_priority <= DN_FIB_INFO(f)->fib_priority)
560 break;
561 }
562
563 if (f && dn_key_eq(f->fn_key, key) &&
564 fi->fib_priority == DN_FIB_INFO(f)->fib_priority) {
565 struct dn_fib_node **ins_fp;
566
567 err = -EEXIST;
568 if (n->nlmsg_flags & NLM_F_EXCL)
569 goto out;
570
571 if (n->nlmsg_flags & NLM_F_REPLACE) {
572 del_fp = fp;
573 fp = &f->fn_next;
574 f = *fp;
575 goto replace;
576 }
577
578 ins_fp = fp;
579 err = -EEXIST;
580
581 DN_FIB_SCAN_KEY(f, fp, key) {
582 if (fi->fib_priority != DN_FIB_INFO(f)->fib_priority)
583 break;
584 if (f->fn_type == type &&
585 f->fn_scope == r->rtm_scope &&
586 DN_FIB_INFO(f) == fi)
587 goto out;
588 }
589
590 if (!(n->nlmsg_flags & NLM_F_APPEND)) {
591 fp = ins_fp;
592 f = *fp;
593 }
594 }
595
596 create:
597 err = -ENOENT;
598 if (!(n->nlmsg_flags & NLM_F_CREATE))
599 goto out;
600
601 replace:
602 err = -ENOBUFS;
603 new_f = kmem_cache_zalloc(dn_hash_kmem, GFP_KERNEL);
604 if (new_f == NULL)
605 goto out;
606
607 new_f->fn_key = key;
608 new_f->fn_type = type;
609 new_f->fn_scope = r->rtm_scope;
610 DN_FIB_INFO(new_f) = fi;
611
612 new_f->fn_next = f;
613 write_lock_bh(&dn_fib_tables_lock);
614 *fp = new_f;
615 write_unlock_bh(&dn_fib_tables_lock);
616 dz->dz_nent++;
617
618 if (del_fp) {
619 f = *del_fp;
620 write_lock_bh(&dn_fib_tables_lock);
621 *del_fp = f->fn_next;
622 write_unlock_bh(&dn_fib_tables_lock);
623
624 if (!(f->fn_state & DN_S_ZOMBIE))
625 dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req);
626 if (f->fn_state & DN_S_ACCESSED)
627 dn_rt_cache_flush(-1);
628 dn_free_node(f);
629 dz->dz_nent--;
630 } else {
631 dn_rt_cache_flush(-1);
632 }
633
634 dn_rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->n, n, req);
635
636 return 0;
637 out:
638 dn_fib_release_info(fi);
639 return err;
640 }
641
642
643 static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
644 {
645 struct dn_hash *table = (struct dn_hash*)tb->data;
646 struct dn_fib_node **fp, **del_fp, *f;
647 int z = r->rtm_dst_len;
648 struct dn_zone *dz;
649 dn_fib_key_t key;
650 int matched;
651
652
653 if (z > 16)
654 return -EINVAL;
655
656 if ((dz = table->dh_zones[z]) == NULL)
657 return -ESRCH;
658
659 dz_key_0(key);
660 if (rta->rta_dst) {
661 __le16 dst;
662 memcpy(&dst, rta->rta_dst, 2);
663 if (dst & ~DZ_MASK(dz))
664 return -EINVAL;
665 key = dz_key(dst, dz);
666 }
667
668 fp = dn_chain_p(key, dz);
669
670 DN_FIB_SCAN(f, fp) {
671 if (dn_key_eq(f->fn_key, key))
672 break;
673 if (dn_key_leq(key, f->fn_key))
674 return -ESRCH;
675 }
676
677 matched = 0;
678 del_fp = NULL;
679 DN_FIB_SCAN_KEY(f, fp, key) {
680 struct dn_fib_info *fi = DN_FIB_INFO(f);
681
682 if (f->fn_state & DN_S_ZOMBIE)
683 return -ESRCH;
684
685 matched++;
686
687 if (del_fp == NULL &&
688 (!r->rtm_type || f->fn_type == r->rtm_type) &&
689 (r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) &&
690 (!r->rtm_protocol ||
691 fi->fib_protocol == r->rtm_protocol) &&
692 dn_fib_nh_match(r, n, rta, fi) == 0)
693 del_fp = fp;
694 }
695
696 if (del_fp) {
697 f = *del_fp;
698 dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req);
699
700 if (matched != 1) {
701 write_lock_bh(&dn_fib_tables_lock);
702 *del_fp = f->fn_next;
703 write_unlock_bh(&dn_fib_tables_lock);
704
705 if (f->fn_state & DN_S_ACCESSED)
706 dn_rt_cache_flush(-1);
707 dn_free_node(f);
708 dz->dz_nent--;
709 } else {
710 f->fn_state |= DN_S_ZOMBIE;
711 if (f->fn_state & DN_S_ACCESSED) {
712 f->fn_state &= ~DN_S_ACCESSED;
713 dn_rt_cache_flush(-1);
714 }
715 if (++dn_fib_hash_zombies > 128)
716 dn_fib_flush();
717 }
718
719 return 0;
720 }
721
722 return -ESRCH;
723 }
724
725 static inline int dn_flush_list(struct dn_fib_node **fp, int z, struct dn_hash *table)
726 {
727 int found = 0;
728 struct dn_fib_node *f;
729
730 while((f = *fp) != NULL) {
731 struct dn_fib_info *fi = DN_FIB_INFO(f);
732
733 if (fi && ((f->fn_state & DN_S_ZOMBIE) || (fi->fib_flags & RTNH_F_DEAD))) {
734 write_lock_bh(&dn_fib_tables_lock);
735 *fp = f->fn_next;
736 write_unlock_bh(&dn_fib_tables_lock);
737
738 dn_free_node(f);
739 found++;
740 continue;
741 }
742 fp = &f->fn_next;
743 }
744
745 return found;
746 }
747
748 static int dn_fib_table_flush(struct dn_fib_table *tb)
749 {
750 struct dn_hash *table = (struct dn_hash *)tb->data;
751 struct dn_zone *dz;
752 int found = 0;
753
754 dn_fib_hash_zombies = 0;
755 for(dz = table->dh_zone_list; dz; dz = dz->dz_next) {
756 int i;
757 int tmp = 0;
758 for(i = dz->dz_divisor-1; i >= 0; i--)
759 tmp += dn_flush_list(&dz->dz_hash[i], dz->dz_order, table);
760 dz->dz_nent -= tmp;
761 found += tmp;
762 }
763
764 return found;
765 }
766
767 static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct flowidn *flp, struct dn_fib_res *res)
768 {
769 int err;
770 struct dn_zone *dz;
771 struct dn_hash *t = (struct dn_hash *)tb->data;
772
773 read_lock(&dn_fib_tables_lock);
774 for(dz = t->dh_zone_list; dz; dz = dz->dz_next) {
775 struct dn_fib_node *f;
776 dn_fib_key_t k = dz_key(flp->daddr, dz);
777
778 for(f = dz_chain(k, dz); f; f = f->fn_next) {
779 if (!dn_key_eq(k, f->fn_key)) {
780 if (dn_key_leq(k, f->fn_key))
781 break;
782 else
783 continue;
784 }
785
786 f->fn_state |= DN_S_ACCESSED;
787
788 if (f->fn_state&DN_S_ZOMBIE)
789 continue;
790
791 if (f->fn_scope < flp->flowidn_scope)
792 continue;
793
794 err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), flp, res);
795
796 if (err == 0) {
797 res->type = f->fn_type;
798 res->scope = f->fn_scope;
799 res->prefixlen = dz->dz_order;
800 goto out;
801 }
802 if (err < 0)
803 goto out;
804 }
805 }
806 err = 1;
807 out:
808 read_unlock(&dn_fib_tables_lock);
809 return err;
810 }
811
812
813 struct dn_fib_table *dn_fib_get_table(u32 n, int create)
814 {
815 struct dn_fib_table *t;
816 struct hlist_node *node;
817 unsigned int h;
818
819 if (n < RT_TABLE_MIN)
820 return NULL;
821
822 if (n > RT_TABLE_MAX)
823 return NULL;
824
825 h = n & (DN_FIB_TABLE_HASHSZ - 1);
826 rcu_read_lock();
827 hlist_for_each_entry_rcu(t, node, &dn_fib_table_hash[h], hlist) {
828 if (t->n == n) {
829 rcu_read_unlock();
830 return t;
831 }
832 }
833 rcu_read_unlock();
834
835 if (!create)
836 return NULL;
837
838 if (in_interrupt() && net_ratelimit()) {
839 printk(KERN_DEBUG "DECnet: BUG! Attempt to create routing table from interrupt\n");
840 return NULL;
841 }
842
843 t = kzalloc(sizeof(struct dn_fib_table) + sizeof(struct dn_hash),
844 GFP_KERNEL);
845 if (t == NULL)
846 return NULL;
847
848 t->n = n;
849 t->insert = dn_fib_table_insert;
850 t->delete = dn_fib_table_delete;
851 t->lookup = dn_fib_table_lookup;
852 t->flush = dn_fib_table_flush;
853 t->dump = dn_fib_table_dump;
854 hlist_add_head_rcu(&t->hlist, &dn_fib_table_hash[h]);
855
856 return t;
857 }
858
859 struct dn_fib_table *dn_fib_empty_table(void)
860 {
861 u32 id;
862
863 for(id = RT_TABLE_MIN; id <= RT_TABLE_MAX; id++)
864 if (dn_fib_get_table(id, 0) == NULL)
865 return dn_fib_get_table(id, 1);
866 return NULL;
867 }
868
869 void dn_fib_flush(void)
870 {
871 int flushed = 0;
872 struct dn_fib_table *tb;
873 struct hlist_node *node;
874 unsigned int h;
875
876 for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) {
877 hlist_for_each_entry(tb, node, &dn_fib_table_hash[h], hlist)
878 flushed += tb->flush(tb);
879 }
880
881 if (flushed)
882 dn_rt_cache_flush(-1);
883 }
884
885 void __init dn_fib_table_init(void)
886 {
887 dn_hash_kmem = kmem_cache_create("dn_fib_info_cache",
888 sizeof(struct dn_fib_info),
889 0, SLAB_HWCACHE_ALIGN,
890 NULL);
891 }
892
893 void __exit dn_fib_table_cleanup(void)
894 {
895 struct dn_fib_table *t;
896 struct hlist_node *node, *next;
897 unsigned int h;
898
899 write_lock(&dn_fib_tables_lock);
900 for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) {
901 hlist_for_each_entry_safe(t, node, next, &dn_fib_table_hash[h],
902 hlist) {
903 hlist_del(&t->hlist);
904 kfree(t);
905 }
906 }
907 write_unlock(&dn_fib_tables_lock);
908 }
x86 "subsystem" repository