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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * DECnet An implementation of the DECnet protocol suite for the LINUX
4 * operating system. DECnet is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * DECnet Routing Forwarding Information Base (Routing Tables)
8 *
9 * Author: Steve Whitehouse <SteveW@ACM.org>
10 * Mostly copied from the IPv4 routing code
11 *
12 *
13 * Changes:
14 *
15 */
16#include <linux/string.h>
17#include <linux/net.h>
18#include <linux/socket.h>
19#include <linux/slab.h>
20#include <linux/sockios.h>
21#include <linux/init.h>
22#include <linux/skbuff.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 <linux/atomic.h>
29#include <linux/uaccess.h>
30#include <linux/route.h> /* RTF_xxx */
31#include <net/neighbour.h>
32#include <net/netlink.h>
33#include <net/tcp.h>
34#include <net/dst.h>
35#include <net/flow.h>
36#include <net/fib_rules.h>
37#include <net/dn.h>
38#include <net/dn_route.h>
39#include <net/dn_fib.h>
40#include <net/dn_neigh.h>
41#include <net/dn_dev.h>
42
43struct dn_zone
44{
45 struct dn_zone *dz_next;
46 struct dn_fib_node **dz_hash;
47 int dz_nent;
48 int dz_divisor;
49 u32 dz_hashmask;
50#define DZ_HASHMASK(dz) ((dz)->dz_hashmask)
51 int dz_order;
52 __le16 dz_mask;
53#define DZ_MASK(dz) ((dz)->dz_mask)
54};
55
56struct dn_hash
57{
58 struct dn_zone *dh_zones[17];
59 struct dn_zone *dh_zone_list;
60};
61
62#define dz_key_0(key) ((key).datum = 0)
63
64#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
65 for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
66
67#define endfor_nexthops(fi) }
68
69#define DN_MAX_DIVISOR 1024
70#define DN_S_ZOMBIE 1
71#define DN_S_ACCESSED 2
72
73#define DN_FIB_SCAN(f, fp) \
74for( ; ((f) = *(fp)) != NULL; (fp) = &(f)->fn_next)
75
76#define DN_FIB_SCAN_KEY(f, fp, key) \
77for( ; ((f) = *(fp)) != NULL && dn_key_eq((f)->fn_key, (key)); (fp) = &(f)->fn_next)
78
79#define RT_TABLE_MIN 1
80#define DN_FIB_TABLE_HASHSZ 256
81static struct hlist_head dn_fib_table_hash[DN_FIB_TABLE_HASHSZ];
82static DEFINE_RWLOCK(dn_fib_tables_lock);
83
84static struct kmem_cache *dn_hash_kmem __read_mostly;
85static int dn_fib_hash_zombies;
86
87static inline dn_fib_idx_t dn_hash(dn_fib_key_t key, struct dn_zone *dz)
88{
89 u16 h = le16_to_cpu(key.datum)>>(16 - dz->dz_order);
90 h ^= (h >> 10);
91 h ^= (h >> 6);
92 h &= DZ_HASHMASK(dz);
93 return *(dn_fib_idx_t *)&h;
94}
95
96static inline dn_fib_key_t dz_key(__le16 dst, struct dn_zone *dz)
97{
98 dn_fib_key_t k;
99 k.datum = dst & DZ_MASK(dz);
100 return k;
101}
102
103static inline struct dn_fib_node **dn_chain_p(dn_fib_key_t key, struct dn_zone *dz)
104{
105 return &dz->dz_hash[dn_hash(key, dz).datum];
106}
107
108static inline struct dn_fib_node *dz_chain(dn_fib_key_t key, struct dn_zone *dz)
109{
110 return dz->dz_hash[dn_hash(key, dz).datum];
111}
112
113static inline int dn_key_eq(dn_fib_key_t a, dn_fib_key_t b)
114{
115 return a.datum == b.datum;
116}
117
118static inline int dn_key_leq(dn_fib_key_t a, dn_fib_key_t b)
119{
120 return a.datum <= b.datum;
121}
122
123static inline void dn_rebuild_zone(struct dn_zone *dz,
124 struct dn_fib_node **old_ht,
125 int old_divisor)
126{
127 struct dn_fib_node *f, **fp, *next;
128 int i;
129
130 for(i = 0; i < old_divisor; i++) {
131 for(f = old_ht[i]; f; f = next) {
132 next = f->fn_next;
133 for(fp = dn_chain_p(f->fn_key, dz);
134 *fp && dn_key_leq((*fp)->fn_key, f->fn_key);
135 fp = &(*fp)->fn_next)
136 /* NOTHING */;
137 f->fn_next = *fp;
138 *fp = f;
139 }
140 }
141}
142
143static void dn_rehash_zone(struct dn_zone *dz)
144{
145 struct dn_fib_node **ht, **old_ht;
146 int old_divisor, new_divisor;
147 u32 new_hashmask;
148
149 old_divisor = dz->dz_divisor;
150
151 switch (old_divisor) {
152 case 16:
153 new_divisor = 256;
154 new_hashmask = 0xFF;
155 break;
156 default:
157 printk(KERN_DEBUG "DECnet: dn_rehash_zone: BUG! %d\n",
158 old_divisor);
159 /* fall through */
160 case 256:
161 new_divisor = 1024;
162 new_hashmask = 0x3FF;
163 break;
164 }
165
166 ht = kcalloc(new_divisor, sizeof(struct dn_fib_node*), GFP_KERNEL);
167 if (ht == NULL)
168 return;
169
170 write_lock_bh(&dn_fib_tables_lock);
171 old_ht = dz->dz_hash;
172 dz->dz_hash = ht;
173 dz->dz_hashmask = new_hashmask;
174 dz->dz_divisor = new_divisor;
175 dn_rebuild_zone(dz, old_ht, old_divisor);
176 write_unlock_bh(&dn_fib_tables_lock);
177 kfree(old_ht);
178}
179
180static void dn_free_node(struct dn_fib_node *f)
181{
182 dn_fib_release_info(DN_FIB_INFO(f));
183 kmem_cache_free(dn_hash_kmem, f);
184}
185
186
187static struct dn_zone *dn_new_zone(struct dn_hash *table, int z)
188{
189 int i;
190 struct dn_zone *dz = kzalloc(sizeof(struct dn_zone), GFP_KERNEL);
191 if (!dz)
192 return NULL;
193
194 if (z) {
195 dz->dz_divisor = 16;
196 dz->dz_hashmask = 0x0F;
197 } else {
198 dz->dz_divisor = 1;
199 dz->dz_hashmask = 0;
200 }
201
202 dz->dz_hash = kcalloc(dz->dz_divisor, sizeof(struct dn_fib_node *), GFP_KERNEL);
203 if (!dz->dz_hash) {
204 kfree(dz);
205 return NULL;
206 }
207
208 dz->dz_order = z;
209 dz->dz_mask = dnet_make_mask(z);
210
211 for(i = z + 1; i <= 16; i++)
212 if (table->dh_zones[i])
213 break;
214
215 write_lock_bh(&dn_fib_tables_lock);
216 if (i>16) {
217 dz->dz_next = table->dh_zone_list;
218 table->dh_zone_list = dz;
219 } else {
220 dz->dz_next = table->dh_zones[i]->dz_next;
221 table->dh_zones[i]->dz_next = dz;
222 }
223 table->dh_zones[z] = dz;
224 write_unlock_bh(&dn_fib_tables_lock);
225 return dz;
226}
227
228
229static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct nlattr *attrs[], struct dn_fib_info *fi)
230{
231 struct rtnexthop *nhp;
232 int nhlen;
233
234 if (attrs[RTA_PRIORITY] &&
235 nla_get_u32(attrs[RTA_PRIORITY]) != fi->fib_priority)
236 return 1;
237
238 if (attrs[RTA_OIF] || attrs[RTA_GATEWAY]) {
239 if ((!attrs[RTA_OIF] || nla_get_u32(attrs[RTA_OIF]) == fi->fib_nh->nh_oif) &&
240 (!attrs[RTA_GATEWAY] || nla_get_le16(attrs[RTA_GATEWAY]) != fi->fib_nh->nh_gw))
241 return 0;
242 return 1;
243 }
244
245 if (!attrs[RTA_MULTIPATH])
246 return 0;
247
248 nhp = nla_data(attrs[RTA_MULTIPATH]);
249 nhlen = nla_len(attrs[RTA_MULTIPATH]);
250
251 for_nexthops(fi) {
252 int attrlen = nhlen - sizeof(struct rtnexthop);
253 __le16 gw;
254
255 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
256 return -EINVAL;
257 if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif)
258 return 1;
259 if (attrlen) {
260 struct nlattr *gw_attr;
261
262 gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY);
263 gw = gw_attr ? nla_get_le16(gw_attr) : 0;
264
265 if (gw && gw != nh->nh_gw)
266 return 1;
267 }
268 nhp = RTNH_NEXT(nhp);
269 } endfor_nexthops(fi);
270
271 return 0;
272}
273
274static inline size_t dn_fib_nlmsg_size(struct dn_fib_info *fi)
275{
276 size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg))
277 + nla_total_size(4) /* RTA_TABLE */
278 + nla_total_size(2) /* RTA_DST */
279 + nla_total_size(4) /* RTA_PRIORITY */
280 + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */
281
282 /* space for nested metrics */
283 payload += nla_total_size((RTAX_MAX * nla_total_size(4)));
284
285 if (fi->fib_nhs) {
286 /* Also handles the special case fib_nhs == 1 */
287
288 /* each nexthop is packed in an attribute */
289 size_t nhsize = nla_total_size(sizeof(struct rtnexthop));
290
291 /* may contain a gateway attribute */
292 nhsize += nla_total_size(4);
293
294 /* all nexthops are packed in a nested attribute */
295 payload += nla_total_size(fi->fib_nhs * nhsize);
296 }
297
298 return payload;
299}
300
301static int dn_fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
302 u32 tb_id, u8 type, u8 scope, void *dst, int dst_len,
303 struct dn_fib_info *fi, unsigned int flags)
304{
305 struct rtmsg *rtm;
306 struct nlmsghdr *nlh;
307
308 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags);
309 if (!nlh)
310 return -EMSGSIZE;
311
312 rtm = nlmsg_data(nlh);
313 rtm->rtm_family = AF_DECnet;
314 rtm->rtm_dst_len = dst_len;
315 rtm->rtm_src_len = 0;
316 rtm->rtm_tos = 0;
317 rtm->rtm_table = tb_id;
318 rtm->rtm_flags = fi->fib_flags;
319 rtm->rtm_scope = scope;
320 rtm->rtm_type = type;
321 rtm->rtm_protocol = fi->fib_protocol;
322
323 if (nla_put_u32(skb, RTA_TABLE, tb_id) < 0)
324 goto errout;
325
326 if (rtm->rtm_dst_len &&
327 nla_put(skb, RTA_DST, 2, dst) < 0)
328 goto errout;
329
330 if (fi->fib_priority &&
331 nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority) < 0)
332 goto errout;
333
334 if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0)
335 goto errout;
336
337 if (fi->fib_nhs == 1) {
338 if (fi->fib_nh->nh_gw &&
339 nla_put_le16(skb, RTA_GATEWAY, fi->fib_nh->nh_gw) < 0)
340 goto errout;
341
342 if (fi->fib_nh->nh_oif &&
343 nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif) < 0)
344 goto errout;
345 }
346
347 if (fi->fib_nhs > 1) {
348 struct rtnexthop *nhp;
349 struct nlattr *mp_head;
350
351 mp_head = nla_nest_start_noflag(skb, RTA_MULTIPATH);
352 if (!mp_head)
353 goto errout;
354
355 for_nexthops(fi) {
356 if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp))))
357 goto errout;
358
359 nhp->rtnh_flags = nh->nh_flags & 0xFF;
360 nhp->rtnh_hops = nh->nh_weight - 1;
361 nhp->rtnh_ifindex = nh->nh_oif;
362
363 if (nh->nh_gw &&
364 nla_put_le16(skb, RTA_GATEWAY, nh->nh_gw) < 0)
365 goto errout;
366
367 nhp->rtnh_len = skb_tail_pointer(skb) - (unsigned char *)nhp;
368 } endfor_nexthops(fi);
369
370 nla_nest_end(skb, mp_head);
371 }
372
373 nlmsg_end(skb, nlh);
374 return 0;
375
376errout:
377 nlmsg_cancel(skb, nlh);
378 return -EMSGSIZE;
379}
380
381
382static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, u32 tb_id,
383 struct nlmsghdr *nlh, struct netlink_skb_parms *req)
384{
385 struct sk_buff *skb;
386 u32 portid = req ? req->portid : 0;
387 int err = -ENOBUFS;
388
389 skb = nlmsg_new(dn_fib_nlmsg_size(DN_FIB_INFO(f)), GFP_KERNEL);
390 if (skb == NULL)
391 goto errout;
392
393 err = dn_fib_dump_info(skb, portid, nlh->nlmsg_seq, event, tb_id,
394 f->fn_type, f->fn_scope, &f->fn_key, z,
395 DN_FIB_INFO(f), 0);
396 if (err < 0) {
397 /* -EMSGSIZE implies BUG in dn_fib_nlmsg_size() */
398 WARN_ON(err == -EMSGSIZE);
399 kfree_skb(skb);
400 goto errout;
401 }
402 rtnl_notify(skb, &init_net, portid, RTNLGRP_DECnet_ROUTE, nlh, GFP_KERNEL);
403 return;
404errout:
405 if (err < 0)
406 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_ROUTE, err);
407}
408
409static __inline__ int dn_hash_dump_bucket(struct sk_buff *skb,
410 struct netlink_callback *cb,
411 struct dn_fib_table *tb,
412 struct dn_zone *dz,
413 struct dn_fib_node *f)
414{
415 int i, s_i;
416
417 s_i = cb->args[4];
418 for(i = 0; f; i++, f = f->fn_next) {
419 if (i < s_i)
420 continue;
421 if (f->fn_state & DN_S_ZOMBIE)
422 continue;
423 if (dn_fib_dump_info(skb, NETLINK_CB(cb->skb).portid,
424 cb->nlh->nlmsg_seq,
425 RTM_NEWROUTE,
426 tb->n,
427 (f->fn_state & DN_S_ZOMBIE) ? 0 : f->fn_type,
428 f->fn_scope, &f->fn_key, dz->dz_order,
429 f->fn_info, NLM_F_MULTI) < 0) {
430 cb->args[4] = i;
431 return -1;
432 }
433 }
434 cb->args[4] = i;
435 return skb->len;
436}
437
438static __inline__ int dn_hash_dump_zone(struct sk_buff *skb,
439 struct netlink_callback *cb,
440 struct dn_fib_table *tb,
441 struct dn_zone *dz)
442{
443 int h, s_h;
444
445 s_h = cb->args[3];
446 for(h = 0; h < dz->dz_divisor; h++) {
447 if (h < s_h)
448 continue;
449 if (h > s_h)
450 memset(&cb->args[4], 0, sizeof(cb->args) - 4*sizeof(cb->args[0]));
451 if (dz->dz_hash == NULL || dz->dz_hash[h] == NULL)
452 continue;
453 if (dn_hash_dump_bucket(skb, cb, tb, dz, dz->dz_hash[h]) < 0) {
454 cb->args[3] = h;
455 return -1;
456 }
457 }
458 cb->args[3] = h;
459 return skb->len;
460}
461
462static int dn_fib_table_dump(struct dn_fib_table *tb, struct sk_buff *skb,
463 struct netlink_callback *cb)
464{
465 int m, s_m;
466 struct dn_zone *dz;
467 struct dn_hash *table = (struct dn_hash *)tb->data;
468
469 s_m = cb->args[2];
470 read_lock(&dn_fib_tables_lock);
471 for(dz = table->dh_zone_list, m = 0; dz; dz = dz->dz_next, m++) {
472 if (m < s_m)
473 continue;
474 if (m > s_m)
475 memset(&cb->args[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0]));
476
477 if (dn_hash_dump_zone(skb, cb, tb, dz) < 0) {
478 cb->args[2] = m;
479 read_unlock(&dn_fib_tables_lock);
480 return -1;
481 }
482 }
483 read_unlock(&dn_fib_tables_lock);
484 cb->args[2] = m;
485
486 return skb->len;
487}
488
489int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb)
490{
491 struct net *net = sock_net(skb->sk);
492 unsigned int h, s_h;
493 unsigned int e = 0, s_e;
494 struct dn_fib_table *tb;
495 int dumped = 0;
496
497 if (!net_eq(net, &init_net))
498 return 0;
499
500 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
501 ((struct rtmsg *)nlmsg_data(cb->nlh))->rtm_flags&RTM_F_CLONED)
502 return dn_cache_dump(skb, cb);
503
504 s_h = cb->args[0];
505 s_e = cb->args[1];
506
507 for (h = s_h; h < DN_FIB_TABLE_HASHSZ; h++, s_h = 0) {
508 e = 0;
509 hlist_for_each_entry(tb, &dn_fib_table_hash[h], hlist) {
510 if (e < s_e)
511 goto next;
512 if (dumped)
513 memset(&cb->args[2], 0, sizeof(cb->args) -
514 2 * sizeof(cb->args[0]));
515 if (tb->dump(tb, skb, cb) < 0)
516 goto out;
517 dumped = 1;
518next:
519 e++;
520 }
521 }
522out:
523 cb->args[1] = e;
524 cb->args[0] = h;
525
526 return skb->len;
527}
528
529static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct nlattr *attrs[],
530 struct nlmsghdr *n, struct netlink_skb_parms *req)
531{
532 struct dn_hash *table = (struct dn_hash *)tb->data;
533 struct dn_fib_node *new_f, *f, **fp, **del_fp;
534 struct dn_zone *dz;
535 struct dn_fib_info *fi;
536 int z = r->rtm_dst_len;
537 int type = r->rtm_type;
538 dn_fib_key_t key;
539 int err;
540
541 if (z > 16)
542 return -EINVAL;
543
544 dz = table->dh_zones[z];
545 if (!dz && !(dz = dn_new_zone(table, z)))
546 return -ENOBUFS;
547
548 dz_key_0(key);
549 if (attrs[RTA_DST]) {
550 __le16 dst = nla_get_le16(attrs[RTA_DST]);
551 if (dst & ~DZ_MASK(dz))
552 return -EINVAL;
553 key = dz_key(dst, dz);
554 }
555
556 if ((fi = dn_fib_create_info(r, attrs, n, &err)) == NULL)
557 return err;
558
559 if (dz->dz_nent > (dz->dz_divisor << 2) &&
560 dz->dz_divisor > DN_MAX_DIVISOR &&
561 (z==16 || (1<<z) > dz->dz_divisor))
562 dn_rehash_zone(dz);
563
564 fp = dn_chain_p(key, dz);
565
566 DN_FIB_SCAN(f, fp) {
567 if (dn_key_leq(key, f->fn_key))
568 break;
569 }
570
571 del_fp = NULL;
572
573 if (f && (f->fn_state & DN_S_ZOMBIE) &&
574 dn_key_eq(f->fn_key, key)) {
575 del_fp = fp;
576 fp = &f->fn_next;
577 f = *fp;
578 goto create;
579 }
580
581 DN_FIB_SCAN_KEY(f, fp, key) {
582 if (fi->fib_priority <= DN_FIB_INFO(f)->fib_priority)
583 break;
584 }
585
586 if (f && dn_key_eq(f->fn_key, key) &&
587 fi->fib_priority == DN_FIB_INFO(f)->fib_priority) {
588 struct dn_fib_node **ins_fp;
589
590 err = -EEXIST;
591 if (n->nlmsg_flags & NLM_F_EXCL)
592 goto out;
593
594 if (n->nlmsg_flags & NLM_F_REPLACE) {
595 del_fp = fp;
596 fp = &f->fn_next;
597 f = *fp;
598 goto replace;
599 }
600
601 ins_fp = fp;
602 err = -EEXIST;
603
604 DN_FIB_SCAN_KEY(f, fp, key) {
605 if (fi->fib_priority != DN_FIB_INFO(f)->fib_priority)
606 break;
607 if (f->fn_type == type &&
608 f->fn_scope == r->rtm_scope &&
609 DN_FIB_INFO(f) == fi)
610 goto out;
611 }
612
613 if (!(n->nlmsg_flags & NLM_F_APPEND)) {
614 fp = ins_fp;
615 f = *fp;
616 }
617 }
618
619create:
620 err = -ENOENT;
621 if (!(n->nlmsg_flags & NLM_F_CREATE))
622 goto out;
623
624replace:
625 err = -ENOBUFS;
626 new_f = kmem_cache_zalloc(dn_hash_kmem, GFP_KERNEL);
627 if (new_f == NULL)
628 goto out;
629
630 new_f->fn_key = key;
631 new_f->fn_type = type;
632 new_f->fn_scope = r->rtm_scope;
633 DN_FIB_INFO(new_f) = fi;
634
635 new_f->fn_next = f;
636 write_lock_bh(&dn_fib_tables_lock);
637 *fp = new_f;
638 write_unlock_bh(&dn_fib_tables_lock);
639 dz->dz_nent++;
640
641 if (del_fp) {
642 f = *del_fp;
643 write_lock_bh(&dn_fib_tables_lock);
644 *del_fp = f->fn_next;
645 write_unlock_bh(&dn_fib_tables_lock);
646
647 if (!(f->fn_state & DN_S_ZOMBIE))
648 dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req);
649 if (f->fn_state & DN_S_ACCESSED)
650 dn_rt_cache_flush(-1);
651 dn_free_node(f);
652 dz->dz_nent--;
653 } else {
654 dn_rt_cache_flush(-1);
655 }
656
657 dn_rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->n, n, req);
658
659 return 0;
660out:
661 dn_fib_release_info(fi);
662 return err;
663}
664
665
666static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct nlattr *attrs[],
667 struct nlmsghdr *n, struct netlink_skb_parms *req)
668{
669 struct dn_hash *table = (struct dn_hash*)tb->data;
670 struct dn_fib_node **fp, **del_fp, *f;
671 int z = r->rtm_dst_len;
672 struct dn_zone *dz;
673 dn_fib_key_t key;
674 int matched;
675
676
677 if (z > 16)
678 return -EINVAL;
679
680 if ((dz = table->dh_zones[z]) == NULL)
681 return -ESRCH;
682
683 dz_key_0(key);
684 if (attrs[RTA_DST]) {
685 __le16 dst = nla_get_le16(attrs[RTA_DST]);
686 if (dst & ~DZ_MASK(dz))
687 return -EINVAL;
688 key = dz_key(dst, dz);
689 }
690
691 fp = dn_chain_p(key, dz);
692
693 DN_FIB_SCAN(f, fp) {
694 if (dn_key_eq(f->fn_key, key))
695 break;
696 if (dn_key_leq(key, f->fn_key))
697 return -ESRCH;
698 }
699
700 matched = 0;
701 del_fp = NULL;
702 DN_FIB_SCAN_KEY(f, fp, key) {
703 struct dn_fib_info *fi = DN_FIB_INFO(f);
704
705 if (f->fn_state & DN_S_ZOMBIE)
706 return -ESRCH;
707
708 matched++;
709
710 if (del_fp == NULL &&
711 (!r->rtm_type || f->fn_type == r->rtm_type) &&
712 (r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) &&
713 (!r->rtm_protocol ||
714 fi->fib_protocol == r->rtm_protocol) &&
715 dn_fib_nh_match(r, n, attrs, fi) == 0)
716 del_fp = fp;
717 }
718
719 if (del_fp) {
720 f = *del_fp;
721 dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req);
722
723 if (matched != 1) {
724 write_lock_bh(&dn_fib_tables_lock);
725 *del_fp = f->fn_next;
726 write_unlock_bh(&dn_fib_tables_lock);
727
728 if (f->fn_state & DN_S_ACCESSED)
729 dn_rt_cache_flush(-1);
730 dn_free_node(f);
731 dz->dz_nent--;
732 } else {
733 f->fn_state |= DN_S_ZOMBIE;
734 if (f->fn_state & DN_S_ACCESSED) {
735 f->fn_state &= ~DN_S_ACCESSED;
736 dn_rt_cache_flush(-1);
737 }
738 if (++dn_fib_hash_zombies > 128)
739 dn_fib_flush();
740 }
741
742 return 0;
743 }
744
745 return -ESRCH;
746}
747
748static inline int dn_flush_list(struct dn_fib_node **fp, int z, struct dn_hash *table)
749{
750 int found = 0;
751 struct dn_fib_node *f;
752
753 while((f = *fp) != NULL) {
754 struct dn_fib_info *fi = DN_FIB_INFO(f);
755
756 if (fi && ((f->fn_state & DN_S_ZOMBIE) || (fi->fib_flags & RTNH_F_DEAD))) {
757 write_lock_bh(&dn_fib_tables_lock);
758 *fp = f->fn_next;
759 write_unlock_bh(&dn_fib_tables_lock);
760
761 dn_free_node(f);
762 found++;
763 continue;
764 }
765 fp = &f->fn_next;
766 }
767
768 return found;
769}
770
771static int dn_fib_table_flush(struct dn_fib_table *tb)
772{
773 struct dn_hash *table = (struct dn_hash *)tb->data;
774 struct dn_zone *dz;
775 int found = 0;
776
777 dn_fib_hash_zombies = 0;
778 for(dz = table->dh_zone_list; dz; dz = dz->dz_next) {
779 int i;
780 int tmp = 0;
781 for(i = dz->dz_divisor-1; i >= 0; i--)
782 tmp += dn_flush_list(&dz->dz_hash[i], dz->dz_order, table);
783 dz->dz_nent -= tmp;
784 found += tmp;
785 }
786
787 return found;
788}
789
790static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct flowidn *flp, struct dn_fib_res *res)
791{
792 int err;
793 struct dn_zone *dz;
794 struct dn_hash *t = (struct dn_hash *)tb->data;
795
796 read_lock(&dn_fib_tables_lock);
797 for(dz = t->dh_zone_list; dz; dz = dz->dz_next) {
798 struct dn_fib_node *f;
799 dn_fib_key_t k = dz_key(flp->daddr, dz);
800
801 for(f = dz_chain(k, dz); f; f = f->fn_next) {
802 if (!dn_key_eq(k, f->fn_key)) {
803 if (dn_key_leq(k, f->fn_key))
804 break;
805 else
806 continue;
807 }
808
809 f->fn_state |= DN_S_ACCESSED;
810
811 if (f->fn_state&DN_S_ZOMBIE)
812 continue;
813
814 if (f->fn_scope < flp->flowidn_scope)
815 continue;
816
817 err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), flp, res);
818
819 if (err == 0) {
820 res->type = f->fn_type;
821 res->scope = f->fn_scope;
822 res->prefixlen = dz->dz_order;
823 goto out;
824 }
825 if (err < 0)
826 goto out;
827 }
828 }
829 err = 1;
830out:
831 read_unlock(&dn_fib_tables_lock);
832 return err;
833}
834
835
836struct dn_fib_table *dn_fib_get_table(u32 n, int create)
837{
838 struct dn_fib_table *t;
839 unsigned int h;
840
841 if (n < RT_TABLE_MIN)
842 return NULL;
843
844 if (n > RT_TABLE_MAX)
845 return NULL;
846
847 h = n & (DN_FIB_TABLE_HASHSZ - 1);
848 rcu_read_lock();
849 hlist_for_each_entry_rcu(t, &dn_fib_table_hash[h], hlist) {
850 if (t->n == n) {
851 rcu_read_unlock();
852 return t;
853 }
854 }
855 rcu_read_unlock();
856
857 if (!create)
858 return NULL;
859
860 if (in_interrupt()) {
861 net_dbg_ratelimited("DECnet: BUG! Attempt to create routing table from interrupt\n");
862 return NULL;
863 }
864
865 t = kzalloc(sizeof(struct dn_fib_table) + sizeof(struct dn_hash),
866 GFP_KERNEL);
867 if (t == NULL)
868 return NULL;
869
870 t->n = n;
871 t->insert = dn_fib_table_insert;
872 t->delete = dn_fib_table_delete;
873 t->lookup = dn_fib_table_lookup;
874 t->flush = dn_fib_table_flush;
875 t->dump = dn_fib_table_dump;
876 hlist_add_head_rcu(&t->hlist, &dn_fib_table_hash[h]);
877
878 return t;
879}
880
881struct dn_fib_table *dn_fib_empty_table(void)
882{
883 u32 id;
884
885 for(id = RT_TABLE_MIN; id <= RT_TABLE_MAX; id++)
886 if (dn_fib_get_table(id, 0) == NULL)
887 return dn_fib_get_table(id, 1);
888 return NULL;
889}
890
891void dn_fib_flush(void)
892{
893 int flushed = 0;
894 struct dn_fib_table *tb;
895 unsigned int h;
896
897 for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) {
898 hlist_for_each_entry(tb, &dn_fib_table_hash[h], hlist)
899 flushed += tb->flush(tb);
900 }
901
902 if (flushed)
903 dn_rt_cache_flush(-1);
904}
905
906void __init dn_fib_table_init(void)
907{
908 dn_hash_kmem = kmem_cache_create("dn_fib_info_cache",
909 sizeof(struct dn_fib_info),
910 0, SLAB_HWCACHE_ALIGN,
911 NULL);
912}
913
914void __exit dn_fib_table_cleanup(void)
915{
916 struct dn_fib_table *t;
917 struct hlist_node *next;
918 unsigned int h;
919
920 write_lock(&dn_fib_tables_lock);
921 for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) {
922 hlist_for_each_entry_safe(t, next, &dn_fib_table_hash[h],
923 hlist) {
924 hlist_del(&t->hlist);
925 kfree(t);
926 }
927 }
928 write_unlock(&dn_fib_tables_lock);
929}