Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * DECnet An implementation of the DECnet protocol suite for the LINUX | |
3 | * operating system. DECnet is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * DECnet Routing 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 | */ | |
1da177e4 LT |
15 | #include <linux/string.h> |
16 | #include <linux/net.h> | |
17 | #include <linux/socket.h> | |
18 | #include <linux/sockios.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/skbuff.h> | |
21 | #include <linux/netlink.h> | |
22 | #include <linux/rtnetlink.h> | |
23 | #include <linux/proc_fs.h> | |
24 | #include <linux/netdevice.h> | |
25 | #include <linux/timer.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <asm/atomic.h> | |
28 | #include <asm/uaccess.h> | |
29 | #include <linux/route.h> /* RTF_xxx */ | |
30 | #include <net/neighbour.h> | |
31 | #include <net/dst.h> | |
32 | #include <net/flow.h> | |
a8731cbf | 33 | #include <net/fib_rules.h> |
1da177e4 LT |
34 | #include <net/dn.h> |
35 | #include <net/dn_route.h> | |
36 | #include <net/dn_fib.h> | |
37 | #include <net/dn_neigh.h> | |
38 | #include <net/dn_dev.h> | |
39 | ||
40 | struct dn_zone | |
41 | { | |
42 | struct dn_zone *dz_next; | |
43 | struct dn_fib_node **dz_hash; | |
44 | int dz_nent; | |
45 | int dz_divisor; | |
46 | u32 dz_hashmask; | |
47 | #define DZ_HASHMASK(dz) ((dz)->dz_hashmask) | |
48 | int dz_order; | |
c4ea94ab | 49 | __le16 dz_mask; |
1da177e4 LT |
50 | #define DZ_MASK(dz) ((dz)->dz_mask) |
51 | }; | |
52 | ||
53 | struct dn_hash | |
54 | { | |
55 | struct dn_zone *dh_zones[17]; | |
56 | struct dn_zone *dh_zone_list; | |
57 | }; | |
58 | ||
59 | #define dz_key_0(key) ((key).datum = 0) | |
60 | #define dz_prefix(key,dz) ((key).datum) | |
61 | ||
62 | #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\ | |
63 | for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++) | |
64 | ||
65 | #define endfor_nexthops(fi) } | |
66 | ||
67 | #define DN_MAX_DIVISOR 1024 | |
68 | #define DN_S_ZOMBIE 1 | |
69 | #define DN_S_ACCESSED 2 | |
70 | ||
71 | #define DN_FIB_SCAN(f, fp) \ | |
72 | for( ; ((f) = *(fp)) != NULL; (fp) = &(f)->fn_next) | |
73 | ||
74 | #define DN_FIB_SCAN_KEY(f, fp, key) \ | |
75 | for( ; ((f) = *(fp)) != NULL && dn_key_eq((f)->fn_key, (key)); (fp) = &(f)->fn_next) | |
76 | ||
77 | #define RT_TABLE_MIN 1 | |
abcab268 PM |
78 | #define DN_FIB_TABLE_HASHSZ 256 |
79 | static struct hlist_head dn_fib_table_hash[DN_FIB_TABLE_HASHSZ]; | |
1da177e4 | 80 | static DEFINE_RWLOCK(dn_fib_tables_lock); |
1da177e4 | 81 | |
ba89966c | 82 | static kmem_cache_t *dn_hash_kmem __read_mostly; |
1da177e4 LT |
83 | static int dn_fib_hash_zombies; |
84 | ||
85 | static inline dn_fib_idx_t dn_hash(dn_fib_key_t key, struct dn_zone *dz) | |
86 | { | |
c4ea94ab | 87 | u16 h = dn_ntohs(key.datum)>>(16 - dz->dz_order); |
1da177e4 LT |
88 | h ^= (h >> 10); |
89 | h ^= (h >> 6); | |
90 | h &= DZ_HASHMASK(dz); | |
91 | return *(dn_fib_idx_t *)&h; | |
92 | } | |
93 | ||
c4ea94ab | 94 | static inline dn_fib_key_t dz_key(__le16 dst, struct dn_zone *dz) |
1da177e4 LT |
95 | { |
96 | dn_fib_key_t k; | |
97 | k.datum = dst & DZ_MASK(dz); | |
98 | return k; | |
99 | } | |
100 | ||
101 | static inline struct dn_fib_node **dn_chain_p(dn_fib_key_t key, struct dn_zone *dz) | |
102 | { | |
103 | return &dz->dz_hash[dn_hash(key, dz).datum]; | |
104 | } | |
105 | ||
106 | static inline struct dn_fib_node *dz_chain(dn_fib_key_t key, struct dn_zone *dz) | |
107 | { | |
108 | return dz->dz_hash[dn_hash(key, dz).datum]; | |
109 | } | |
110 | ||
111 | static inline int dn_key_eq(dn_fib_key_t a, dn_fib_key_t b) | |
112 | { | |
113 | return a.datum == b.datum; | |
114 | } | |
115 | ||
116 | static inline int dn_key_leq(dn_fib_key_t a, dn_fib_key_t b) | |
117 | { | |
118 | return a.datum <= b.datum; | |
119 | } | |
120 | ||
121 | static inline void dn_rebuild_zone(struct dn_zone *dz, | |
122 | struct dn_fib_node **old_ht, | |
123 | int old_divisor) | |
124 | { | |
125 | int i; | |
126 | struct dn_fib_node *f, **fp, *next; | |
127 | ||
128 | for(i = 0; i < old_divisor; i++) { | |
129 | for(f = old_ht[i]; f; f = f->fn_next) { | |
130 | next = f->fn_next; | |
131 | for(fp = dn_chain_p(f->fn_key, dz); | |
132 | *fp && dn_key_leq((*fp)->fn_key, f->fn_key); | |
133 | fp = &(*fp)->fn_next) | |
134 | /* NOTHING */; | |
135 | f->fn_next = *fp; | |
136 | *fp = f; | |
137 | } | |
138 | } | |
139 | } | |
140 | ||
141 | static void dn_rehash_zone(struct dn_zone *dz) | |
142 | { | |
143 | struct dn_fib_node **ht, **old_ht; | |
144 | int old_divisor, new_divisor; | |
145 | u32 new_hashmask; | |
146 | ||
147 | old_divisor = dz->dz_divisor; | |
148 | ||
149 | switch(old_divisor) { | |
150 | case 16: | |
151 | new_divisor = 256; | |
152 | new_hashmask = 0xFF; | |
153 | break; | |
154 | default: | |
155 | printk(KERN_DEBUG "DECnet: dn_rehash_zone: BUG! %d\n", old_divisor); | |
156 | case 256: | |
157 | new_divisor = 1024; | |
158 | new_hashmask = 0x3FF; | |
159 | break; | |
160 | } | |
161 | ||
0da974f4 | 162 | ht = kcalloc(new_divisor, sizeof(struct dn_fib_node*), GFP_KERNEL); |
1da177e4 LT |
163 | if (ht == NULL) |
164 | return; | |
165 | ||
1da177e4 LT |
166 | write_lock_bh(&dn_fib_tables_lock); |
167 | old_ht = dz->dz_hash; | |
168 | dz->dz_hash = ht; | |
169 | dz->dz_hashmask = new_hashmask; | |
170 | dz->dz_divisor = new_divisor; | |
171 | dn_rebuild_zone(dz, old_ht, old_divisor); | |
172 | write_unlock_bh(&dn_fib_tables_lock); | |
173 | kfree(old_ht); | |
174 | } | |
175 | ||
176 | static void dn_free_node(struct dn_fib_node *f) | |
177 | { | |
178 | dn_fib_release_info(DN_FIB_INFO(f)); | |
179 | kmem_cache_free(dn_hash_kmem, f); | |
180 | } | |
181 | ||
182 | ||
183 | static struct dn_zone *dn_new_zone(struct dn_hash *table, int z) | |
184 | { | |
185 | int i; | |
0da974f4 | 186 | struct dn_zone *dz = kzalloc(sizeof(struct dn_zone), GFP_KERNEL); |
1da177e4 LT |
187 | if (!dz) |
188 | return NULL; | |
189 | ||
1da177e4 LT |
190 | if (z) { |
191 | dz->dz_divisor = 16; | |
192 | dz->dz_hashmask = 0x0F; | |
193 | } else { | |
194 | dz->dz_divisor = 1; | |
195 | dz->dz_hashmask = 0; | |
196 | } | |
197 | ||
0da974f4 | 198 | dz->dz_hash = kcalloc(dz->dz_divisor, sizeof(struct dn_fib_node *), GFP_KERNEL); |
1da177e4 LT |
199 | if (!dz->dz_hash) { |
200 | kfree(dz); | |
201 | return NULL; | |
202 | } | |
203 | ||
1da177e4 LT |
204 | dz->dz_order = z; |
205 | dz->dz_mask = dnet_make_mask(z); | |
206 | ||
207 | for(i = z + 1; i <= 16; i++) | |
208 | if (table->dh_zones[i]) | |
209 | break; | |
210 | ||
211 | write_lock_bh(&dn_fib_tables_lock); | |
212 | if (i>16) { | |
213 | dz->dz_next = table->dh_zone_list; | |
214 | table->dh_zone_list = dz; | |
215 | } else { | |
216 | dz->dz_next = table->dh_zones[i]->dz_next; | |
217 | table->dh_zones[i]->dz_next = dz; | |
218 | } | |
219 | table->dh_zones[z] = dz; | |
220 | write_unlock_bh(&dn_fib_tables_lock); | |
221 | return dz; | |
222 | } | |
223 | ||
224 | ||
225 | static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct dn_kern_rta *rta, struct dn_fib_info *fi) | |
226 | { | |
227 | struct rtnexthop *nhp; | |
228 | int nhlen; | |
229 | ||
230 | if (rta->rta_priority && *rta->rta_priority != fi->fib_priority) | |
231 | return 1; | |
232 | ||
233 | if (rta->rta_oif || rta->rta_gw) { | |
234 | if ((!rta->rta_oif || *rta->rta_oif == fi->fib_nh->nh_oif) && | |
235 | (!rta->rta_gw || memcmp(rta->rta_gw, &fi->fib_nh->nh_gw, 2) == 0)) | |
236 | return 0; | |
237 | return 1; | |
238 | } | |
239 | ||
240 | if (rta->rta_mp == NULL) | |
241 | return 0; | |
242 | ||
243 | nhp = RTA_DATA(rta->rta_mp); | |
244 | nhlen = RTA_PAYLOAD(rta->rta_mp); | |
245 | ||
246 | for_nexthops(fi) { | |
247 | int attrlen = nhlen - sizeof(struct rtnexthop); | |
c4ea94ab | 248 | __le16 gw; |
1da177e4 LT |
249 | |
250 | if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0) | |
251 | return -EINVAL; | |
252 | if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif) | |
253 | return 1; | |
254 | if (attrlen) { | |
255 | gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY); | |
256 | ||
257 | if (gw && gw != nh->nh_gw) | |
258 | return 1; | |
259 | } | |
260 | nhp = RTNH_NEXT(nhp); | |
261 | } endfor_nexthops(fi); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | static int dn_fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event, | |
2dfe55b4 | 267 | u32 tb_id, u8 type, u8 scope, void *dst, int dst_len, |
b6544c0b | 268 | struct dn_fib_info *fi, unsigned int flags) |
1da177e4 LT |
269 | { |
270 | struct rtmsg *rtm; | |
271 | struct nlmsghdr *nlh; | |
272 | unsigned char *b = skb->tail; | |
273 | ||
b6544c0b | 274 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*rtm), flags); |
1da177e4 LT |
275 | rtm = NLMSG_DATA(nlh); |
276 | rtm->rtm_family = AF_DECnet; | |
277 | rtm->rtm_dst_len = dst_len; | |
278 | rtm->rtm_src_len = 0; | |
279 | rtm->rtm_tos = 0; | |
280 | rtm->rtm_table = tb_id; | |
9e762a4a | 281 | RTA_PUT_U32(skb, RTA_TABLE, tb_id); |
1da177e4 LT |
282 | rtm->rtm_flags = fi->fib_flags; |
283 | rtm->rtm_scope = scope; | |
284 | rtm->rtm_type = type; | |
285 | if (rtm->rtm_dst_len) | |
286 | RTA_PUT(skb, RTA_DST, 2, dst); | |
287 | rtm->rtm_protocol = fi->fib_protocol; | |
288 | if (fi->fib_priority) | |
289 | RTA_PUT(skb, RTA_PRIORITY, 4, &fi->fib_priority); | |
290 | if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0) | |
291 | goto rtattr_failure; | |
292 | if (fi->fib_nhs == 1) { | |
293 | if (fi->fib_nh->nh_gw) | |
294 | RTA_PUT(skb, RTA_GATEWAY, 2, &fi->fib_nh->nh_gw); | |
295 | if (fi->fib_nh->nh_oif) | |
296 | RTA_PUT(skb, RTA_OIF, sizeof(int), &fi->fib_nh->nh_oif); | |
297 | } | |
298 | if (fi->fib_nhs > 1) { | |
299 | struct rtnexthop *nhp; | |
300 | struct rtattr *mp_head; | |
301 | if (skb_tailroom(skb) <= RTA_SPACE(0)) | |
302 | goto rtattr_failure; | |
303 | mp_head = (struct rtattr *)skb_put(skb, RTA_SPACE(0)); | |
304 | ||
305 | for_nexthops(fi) { | |
306 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) | |
307 | goto rtattr_failure; | |
308 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
309 | nhp->rtnh_flags = nh->nh_flags & 0xFF; | |
310 | nhp->rtnh_hops = nh->nh_weight - 1; | |
311 | nhp->rtnh_ifindex = nh->nh_oif; | |
312 | if (nh->nh_gw) | |
313 | RTA_PUT(skb, RTA_GATEWAY, 2, &nh->nh_gw); | |
314 | nhp->rtnh_len = skb->tail - (unsigned char *)nhp; | |
315 | } endfor_nexthops(fi); | |
316 | mp_head->rta_type = RTA_MULTIPATH; | |
317 | mp_head->rta_len = skb->tail - (u8*)mp_head; | |
318 | } | |
319 | ||
320 | nlh->nlmsg_len = skb->tail - b; | |
321 | return skb->len; | |
322 | ||
323 | ||
324 | nlmsg_failure: | |
325 | rtattr_failure: | |
326 | skb_trim(skb, b - skb->data); | |
327 | return -1; | |
328 | } | |
329 | ||
330 | ||
2dfe55b4 | 331 | static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, u32 tb_id, |
1da177e4 LT |
332 | struct nlmsghdr *nlh, struct netlink_skb_parms *req) |
333 | { | |
334 | struct sk_buff *skb; | |
335 | u32 pid = req ? req->pid : 0; | |
dc738dd8 | 336 | int err = -ENOBUFS; |
1da177e4 | 337 | |
dc738dd8 TG |
338 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
339 | if (skb == NULL) | |
340 | goto errout; | |
1da177e4 | 341 | |
dc738dd8 TG |
342 | err = dn_fib_dump_info(skb, pid, nlh->nlmsg_seq, event, tb_id, |
343 | f->fn_type, f->fn_scope, &f->fn_key, z, | |
344 | DN_FIB_INFO(f), 0); | |
345 | if (err < 0) { | |
1da177e4 | 346 | kfree_skb(skb); |
dc738dd8 | 347 | goto errout; |
1da177e4 | 348 | } |
dc738dd8 TG |
349 | |
350 | err = rtnl_notify(skb, pid, RTNLGRP_DECnet_ROUTE, nlh, GFP_KERNEL); | |
351 | errout: | |
352 | if (err < 0) | |
353 | rtnl_set_sk_err(RTNLGRP_DECnet_ROUTE, err); | |
1da177e4 LT |
354 | } |
355 | ||
356 | static __inline__ int dn_hash_dump_bucket(struct sk_buff *skb, | |
357 | struct netlink_callback *cb, | |
358 | struct dn_fib_table *tb, | |
359 | struct dn_zone *dz, | |
360 | struct dn_fib_node *f) | |
361 | { | |
362 | int i, s_i; | |
363 | ||
abcab268 | 364 | s_i = cb->args[4]; |
1da177e4 LT |
365 | for(i = 0; f; i++, f = f->fn_next) { |
366 | if (i < s_i) | |
367 | continue; | |
368 | if (f->fn_state & DN_S_ZOMBIE) | |
369 | continue; | |
370 | if (dn_fib_dump_info(skb, NETLINK_CB(cb->skb).pid, | |
371 | cb->nlh->nlmsg_seq, | |
372 | RTM_NEWROUTE, | |
373 | tb->n, | |
374 | (f->fn_state & DN_S_ZOMBIE) ? 0 : f->fn_type, | |
375 | f->fn_scope, &f->fn_key, dz->dz_order, | |
b6544c0b | 376 | f->fn_info, NLM_F_MULTI) < 0) { |
abcab268 | 377 | cb->args[4] = i; |
1da177e4 LT |
378 | return -1; |
379 | } | |
380 | } | |
abcab268 | 381 | cb->args[4] = i; |
1da177e4 LT |
382 | return skb->len; |
383 | } | |
384 | ||
385 | static __inline__ int dn_hash_dump_zone(struct sk_buff *skb, | |
386 | struct netlink_callback *cb, | |
387 | struct dn_fib_table *tb, | |
388 | struct dn_zone *dz) | |
389 | { | |
390 | int h, s_h; | |
391 | ||
abcab268 | 392 | s_h = cb->args[3]; |
1da177e4 LT |
393 | for(h = 0; h < dz->dz_divisor; h++) { |
394 | if (h < s_h) | |
395 | continue; | |
396 | if (h > s_h) | |
abcab268 | 397 | memset(&cb->args[4], 0, sizeof(cb->args) - 4*sizeof(cb->args[0])); |
1da177e4 LT |
398 | if (dz->dz_hash == NULL || dz->dz_hash[h] == NULL) |
399 | continue; | |
400 | if (dn_hash_dump_bucket(skb, cb, tb, dz, dz->dz_hash[h]) < 0) { | |
abcab268 | 401 | cb->args[3] = h; |
1da177e4 LT |
402 | return -1; |
403 | } | |
404 | } | |
abcab268 | 405 | cb->args[3] = h; |
1da177e4 LT |
406 | return skb->len; |
407 | } | |
408 | ||
409 | static int dn_fib_table_dump(struct dn_fib_table *tb, struct sk_buff *skb, | |
410 | struct netlink_callback *cb) | |
411 | { | |
412 | int m, s_m; | |
413 | struct dn_zone *dz; | |
414 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
415 | ||
abcab268 | 416 | s_m = cb->args[2]; |
1da177e4 LT |
417 | read_lock(&dn_fib_tables_lock); |
418 | for(dz = table->dh_zone_list, m = 0; dz; dz = dz->dz_next, m++) { | |
419 | if (m < s_m) | |
420 | continue; | |
421 | if (m > s_m) | |
abcab268 | 422 | memset(&cb->args[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0])); |
1da177e4 LT |
423 | |
424 | if (dn_hash_dump_zone(skb, cb, tb, dz) < 0) { | |
abcab268 | 425 | cb->args[2] = m; |
1da177e4 LT |
426 | read_unlock(&dn_fib_tables_lock); |
427 | return -1; | |
428 | } | |
429 | } | |
430 | read_unlock(&dn_fib_tables_lock); | |
abcab268 | 431 | cb->args[2] = m; |
1da177e4 LT |
432 | |
433 | return skb->len; | |
434 | } | |
435 | ||
abcab268 PM |
436 | int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb) |
437 | { | |
438 | unsigned int h, s_h; | |
439 | unsigned int e = 0, s_e; | |
440 | struct dn_fib_table *tb; | |
441 | struct hlist_node *node; | |
442 | int dumped = 0; | |
443 | ||
444 | if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) && | |
445 | ((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED) | |
446 | return dn_cache_dump(skb, cb); | |
447 | ||
448 | s_h = cb->args[0]; | |
449 | s_e = cb->args[1]; | |
450 | ||
451 | for (h = s_h; h < DN_FIB_TABLE_HASHSZ; h++, s_h = 0) { | |
452 | e = 0; | |
453 | hlist_for_each_entry(tb, node, &dn_fib_table_hash[h], hlist) { | |
454 | if (e < s_e) | |
455 | goto next; | |
456 | if (dumped) | |
457 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
458 | 2 * sizeof(cb->args[0])); | |
459 | if (tb->dump(tb, skb, cb) < 0) | |
460 | goto out; | |
461 | dumped = 1; | |
462 | next: | |
463 | e++; | |
464 | } | |
465 | } | |
466 | out: | |
467 | cb->args[1] = e; | |
468 | cb->args[0] = h; | |
469 | ||
470 | return skb->len; | |
471 | } | |
472 | ||
1da177e4 LT |
473 | 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) |
474 | { | |
475 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
476 | struct dn_fib_node *new_f, *f, **fp, **del_fp; | |
477 | struct dn_zone *dz; | |
478 | struct dn_fib_info *fi; | |
479 | int z = r->rtm_dst_len; | |
480 | int type = r->rtm_type; | |
481 | dn_fib_key_t key; | |
482 | int err; | |
483 | ||
484 | if (z > 16) | |
485 | return -EINVAL; | |
486 | ||
487 | dz = table->dh_zones[z]; | |
488 | if (!dz && !(dz = dn_new_zone(table, z))) | |
489 | return -ENOBUFS; | |
490 | ||
491 | dz_key_0(key); | |
492 | if (rta->rta_dst) { | |
c4ea94ab | 493 | __le16 dst; |
1da177e4 LT |
494 | memcpy(&dst, rta->rta_dst, 2); |
495 | if (dst & ~DZ_MASK(dz)) | |
496 | return -EINVAL; | |
497 | key = dz_key(dst, dz); | |
498 | } | |
499 | ||
500 | if ((fi = dn_fib_create_info(r, rta, n, &err)) == NULL) | |
501 | return err; | |
502 | ||
503 | if (dz->dz_nent > (dz->dz_divisor << 2) && | |
504 | dz->dz_divisor > DN_MAX_DIVISOR && | |
505 | (z==16 || (1<<z) > dz->dz_divisor)) | |
506 | dn_rehash_zone(dz); | |
507 | ||
508 | fp = dn_chain_p(key, dz); | |
509 | ||
510 | DN_FIB_SCAN(f, fp) { | |
511 | if (dn_key_leq(key, f->fn_key)) | |
512 | break; | |
513 | } | |
514 | ||
515 | del_fp = NULL; | |
516 | ||
517 | if (f && (f->fn_state & DN_S_ZOMBIE) && | |
518 | dn_key_eq(f->fn_key, key)) { | |
519 | del_fp = fp; | |
520 | fp = &f->fn_next; | |
521 | f = *fp; | |
522 | goto create; | |
523 | } | |
524 | ||
525 | DN_FIB_SCAN_KEY(f, fp, key) { | |
526 | if (fi->fib_priority <= DN_FIB_INFO(f)->fib_priority) | |
527 | break; | |
528 | } | |
529 | ||
530 | if (f && dn_key_eq(f->fn_key, key) && | |
531 | fi->fib_priority == DN_FIB_INFO(f)->fib_priority) { | |
532 | struct dn_fib_node **ins_fp; | |
533 | ||
534 | err = -EEXIST; | |
535 | if (n->nlmsg_flags & NLM_F_EXCL) | |
536 | goto out; | |
537 | ||
538 | if (n->nlmsg_flags & NLM_F_REPLACE) { | |
539 | del_fp = fp; | |
540 | fp = &f->fn_next; | |
541 | f = *fp; | |
542 | goto replace; | |
543 | } | |
544 | ||
545 | ins_fp = fp; | |
546 | err = -EEXIST; | |
547 | ||
548 | DN_FIB_SCAN_KEY(f, fp, key) { | |
549 | if (fi->fib_priority != DN_FIB_INFO(f)->fib_priority) | |
550 | break; | |
551 | if (f->fn_type == type && f->fn_scope == r->rtm_scope | |
552 | && DN_FIB_INFO(f) == fi) | |
553 | goto out; | |
554 | } | |
555 | ||
556 | if (!(n->nlmsg_flags & NLM_F_APPEND)) { | |
557 | fp = ins_fp; | |
558 | f = *fp; | |
559 | } | |
560 | } | |
561 | ||
562 | create: | |
563 | err = -ENOENT; | |
564 | if (!(n->nlmsg_flags & NLM_F_CREATE)) | |
565 | goto out; | |
566 | ||
567 | replace: | |
568 | err = -ENOBUFS; | |
569 | new_f = kmem_cache_alloc(dn_hash_kmem, SLAB_KERNEL); | |
570 | if (new_f == NULL) | |
571 | goto out; | |
572 | ||
573 | memset(new_f, 0, sizeof(struct dn_fib_node)); | |
574 | ||
575 | new_f->fn_key = key; | |
576 | new_f->fn_type = type; | |
577 | new_f->fn_scope = r->rtm_scope; | |
578 | DN_FIB_INFO(new_f) = fi; | |
579 | ||
580 | new_f->fn_next = f; | |
581 | write_lock_bh(&dn_fib_tables_lock); | |
582 | *fp = new_f; | |
583 | write_unlock_bh(&dn_fib_tables_lock); | |
584 | dz->dz_nent++; | |
585 | ||
586 | if (del_fp) { | |
587 | f = *del_fp; | |
588 | write_lock_bh(&dn_fib_tables_lock); | |
589 | *del_fp = f->fn_next; | |
590 | write_unlock_bh(&dn_fib_tables_lock); | |
591 | ||
592 | if (!(f->fn_state & DN_S_ZOMBIE)) | |
593 | dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req); | |
594 | if (f->fn_state & DN_S_ACCESSED) | |
595 | dn_rt_cache_flush(-1); | |
596 | dn_free_node(f); | |
597 | dz->dz_nent--; | |
598 | } else { | |
599 | dn_rt_cache_flush(-1); | |
600 | } | |
601 | ||
602 | dn_rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->n, n, req); | |
603 | ||
604 | return 0; | |
605 | out: | |
606 | dn_fib_release_info(fi); | |
607 | return err; | |
608 | } | |
609 | ||
610 | ||
611 | 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) | |
612 | { | |
613 | struct dn_hash *table = (struct dn_hash*)tb->data; | |
614 | struct dn_fib_node **fp, **del_fp, *f; | |
615 | int z = r->rtm_dst_len; | |
616 | struct dn_zone *dz; | |
617 | dn_fib_key_t key; | |
618 | int matched; | |
619 | ||
620 | ||
621 | if (z > 16) | |
622 | return -EINVAL; | |
623 | ||
624 | if ((dz = table->dh_zones[z]) == NULL) | |
625 | return -ESRCH; | |
626 | ||
627 | dz_key_0(key); | |
628 | if (rta->rta_dst) { | |
c4ea94ab | 629 | __le16 dst; |
1da177e4 LT |
630 | memcpy(&dst, rta->rta_dst, 2); |
631 | if (dst & ~DZ_MASK(dz)) | |
632 | return -EINVAL; | |
633 | key = dz_key(dst, dz); | |
634 | } | |
635 | ||
636 | fp = dn_chain_p(key, dz); | |
637 | ||
638 | DN_FIB_SCAN(f, fp) { | |
639 | if (dn_key_eq(f->fn_key, key)) | |
640 | break; | |
641 | if (dn_key_leq(key, f->fn_key)) | |
642 | return -ESRCH; | |
643 | } | |
644 | ||
645 | matched = 0; | |
646 | del_fp = NULL; | |
647 | DN_FIB_SCAN_KEY(f, fp, key) { | |
648 | struct dn_fib_info *fi = DN_FIB_INFO(f); | |
649 | ||
650 | if (f->fn_state & DN_S_ZOMBIE) | |
651 | return -ESRCH; | |
652 | ||
653 | matched++; | |
654 | ||
655 | if (del_fp == NULL && | |
656 | (!r->rtm_type || f->fn_type == r->rtm_type) && | |
657 | (r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) && | |
658 | (!r->rtm_protocol || | |
659 | fi->fib_protocol == r->rtm_protocol) && | |
660 | dn_fib_nh_match(r, n, rta, fi) == 0) | |
661 | del_fp = fp; | |
662 | } | |
663 | ||
664 | if (del_fp) { | |
665 | f = *del_fp; | |
666 | dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req); | |
667 | ||
668 | if (matched != 1) { | |
669 | write_lock_bh(&dn_fib_tables_lock); | |
670 | *del_fp = f->fn_next; | |
671 | write_unlock_bh(&dn_fib_tables_lock); | |
672 | ||
673 | if (f->fn_state & DN_S_ACCESSED) | |
674 | dn_rt_cache_flush(-1); | |
675 | dn_free_node(f); | |
676 | dz->dz_nent--; | |
677 | } else { | |
678 | f->fn_state |= DN_S_ZOMBIE; | |
679 | if (f->fn_state & DN_S_ACCESSED) { | |
680 | f->fn_state &= ~DN_S_ACCESSED; | |
681 | dn_rt_cache_flush(-1); | |
682 | } | |
683 | if (++dn_fib_hash_zombies > 128) | |
684 | dn_fib_flush(); | |
685 | } | |
686 | ||
687 | return 0; | |
688 | } | |
689 | ||
690 | return -ESRCH; | |
691 | } | |
692 | ||
693 | static inline int dn_flush_list(struct dn_fib_node **fp, int z, struct dn_hash *table) | |
694 | { | |
695 | int found = 0; | |
696 | struct dn_fib_node *f; | |
697 | ||
698 | while((f = *fp) != NULL) { | |
699 | struct dn_fib_info *fi = DN_FIB_INFO(f); | |
700 | ||
701 | if (fi && ((f->fn_state & DN_S_ZOMBIE) || (fi->fib_flags & RTNH_F_DEAD))) { | |
702 | write_lock_bh(&dn_fib_tables_lock); | |
703 | *fp = f->fn_next; | |
704 | write_unlock_bh(&dn_fib_tables_lock); | |
705 | ||
706 | dn_free_node(f); | |
707 | found++; | |
708 | continue; | |
709 | } | |
710 | fp = &f->fn_next; | |
711 | } | |
712 | ||
713 | return found; | |
714 | } | |
715 | ||
716 | static int dn_fib_table_flush(struct dn_fib_table *tb) | |
717 | { | |
718 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
719 | struct dn_zone *dz; | |
720 | int found = 0; | |
721 | ||
722 | dn_fib_hash_zombies = 0; | |
723 | for(dz = table->dh_zone_list; dz; dz = dz->dz_next) { | |
724 | int i; | |
725 | int tmp = 0; | |
726 | for(i = dz->dz_divisor-1; i >= 0; i--) | |
727 | tmp += dn_flush_list(&dz->dz_hash[i], dz->dz_order, table); | |
728 | dz->dz_nent -= tmp; | |
729 | found += tmp; | |
730 | } | |
731 | ||
732 | return found; | |
733 | } | |
734 | ||
735 | static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct flowi *flp, struct dn_fib_res *res) | |
736 | { | |
737 | int err; | |
738 | struct dn_zone *dz; | |
739 | struct dn_hash *t = (struct dn_hash *)tb->data; | |
740 | ||
741 | read_lock(&dn_fib_tables_lock); | |
742 | for(dz = t->dh_zone_list; dz; dz = dz->dz_next) { | |
743 | struct dn_fib_node *f; | |
744 | dn_fib_key_t k = dz_key(flp->fld_dst, dz); | |
745 | ||
746 | for(f = dz_chain(k, dz); f; f = f->fn_next) { | |
747 | if (!dn_key_eq(k, f->fn_key)) { | |
748 | if (dn_key_leq(k, f->fn_key)) | |
749 | break; | |
750 | else | |
751 | continue; | |
752 | } | |
753 | ||
754 | f->fn_state |= DN_S_ACCESSED; | |
755 | ||
756 | if (f->fn_state&DN_S_ZOMBIE) | |
757 | continue; | |
758 | ||
759 | if (f->fn_scope < flp->fld_scope) | |
760 | continue; | |
761 | ||
762 | err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), flp, res); | |
763 | ||
764 | if (err == 0) { | |
765 | res->type = f->fn_type; | |
766 | res->scope = f->fn_scope; | |
767 | res->prefixlen = dz->dz_order; | |
768 | goto out; | |
769 | } | |
770 | if (err < 0) | |
771 | goto out; | |
772 | } | |
773 | } | |
774 | err = 1; | |
775 | out: | |
776 | read_unlock(&dn_fib_tables_lock); | |
777 | return err; | |
778 | } | |
779 | ||
780 | ||
2dfe55b4 | 781 | struct dn_fib_table *dn_fib_get_table(u32 n, int create) |
1da177e4 LT |
782 | { |
783 | struct dn_fib_table *t; | |
abcab268 PM |
784 | struct hlist_node *node; |
785 | unsigned int h; | |
1da177e4 LT |
786 | |
787 | if (n < RT_TABLE_MIN) | |
788 | return NULL; | |
789 | ||
790 | if (n > RT_TABLE_MAX) | |
791 | return NULL; | |
792 | ||
abcab268 PM |
793 | h = n & (DN_FIB_TABLE_HASHSZ - 1); |
794 | rcu_read_lock(); | |
795 | hlist_for_each_entry_rcu(t, node, &dn_fib_table_hash[h], hlist) { | |
796 | if (t->n == n) { | |
797 | rcu_read_unlock(); | |
798 | return t; | |
799 | } | |
800 | } | |
801 | rcu_read_unlock(); | |
1da177e4 LT |
802 | |
803 | if (!create) | |
804 | return NULL; | |
805 | ||
806 | if (in_interrupt() && net_ratelimit()) { | |
807 | printk(KERN_DEBUG "DECnet: BUG! Attempt to create routing table from interrupt\n"); | |
808 | return NULL; | |
809 | } | |
810 | if ((t = kmalloc(sizeof(struct dn_fib_table) + sizeof(struct dn_hash), GFP_KERNEL)) == NULL) | |
811 | return NULL; | |
812 | ||
813 | memset(t, 0, sizeof(struct dn_fib_table)); | |
814 | ||
815 | t->n = n; | |
816 | t->insert = dn_fib_table_insert; | |
817 | t->delete = dn_fib_table_delete; | |
818 | t->lookup = dn_fib_table_lookup; | |
819 | t->flush = dn_fib_table_flush; | |
820 | t->dump = dn_fib_table_dump; | |
821 | memset(t->data, 0, sizeof(struct dn_hash)); | |
abcab268 | 822 | hlist_add_head_rcu(&t->hlist, &dn_fib_table_hash[h]); |
1da177e4 LT |
823 | |
824 | return t; | |
825 | } | |
826 | ||
1da177e4 LT |
827 | struct dn_fib_table *dn_fib_empty_table(void) |
828 | { | |
2dfe55b4 | 829 | u32 id; |
1da177e4 LT |
830 | |
831 | for(id = RT_TABLE_MIN; id <= RT_TABLE_MAX; id++) | |
abcab268 | 832 | if (dn_fib_get_table(id, 0) == NULL) |
1da177e4 LT |
833 | return dn_fib_get_table(id, 1); |
834 | return NULL; | |
835 | } | |
836 | ||
abcab268 PM |
837 | void dn_fib_flush(void) |
838 | { | |
839 | int flushed = 0; | |
840 | struct dn_fib_table *tb; | |
841 | struct hlist_node *node; | |
842 | unsigned int h; | |
843 | ||
844 | for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) { | |
845 | hlist_for_each_entry(tb, node, &dn_fib_table_hash[h], hlist) | |
846 | flushed += tb->flush(tb); | |
847 | } | |
848 | ||
849 | if (flushed) | |
850 | dn_rt_cache_flush(-1); | |
851 | } | |
852 | ||
1da177e4 LT |
853 | void __init dn_fib_table_init(void) |
854 | { | |
855 | dn_hash_kmem = kmem_cache_create("dn_fib_info_cache", | |
856 | sizeof(struct dn_fib_info), | |
857 | 0, SLAB_HWCACHE_ALIGN, | |
858 | NULL, NULL); | |
859 | } | |
860 | ||
861 | void __exit dn_fib_table_cleanup(void) | |
862 | { | |
abcab268 PM |
863 | struct dn_fib_table *t; |
864 | struct hlist_node *node, *next; | |
865 | unsigned int h; | |
1da177e4 | 866 | |
abcab268 PM |
867 | write_lock(&dn_fib_tables_lock); |
868 | for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) { | |
869 | hlist_for_each_entry_safe(t, node, next, &dn_fib_table_hash[h], | |
870 | hlist) { | |
871 | hlist_del(&t->hlist); | |
872 | kfree(t); | |
873 | } | |
874 | } | |
875 | write_unlock(&dn_fib_tables_lock); | |
1da177e4 | 876 | } |