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 | |
e18b890b | 82 | static struct kmem_cache *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 | ||
339bf98f TG |
266 | static inline size_t dn_fib_nlmsg_size(struct dn_fib_info *fi) |
267 | { | |
75356f27 | 268 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) |
339bf98f TG |
269 | + nla_total_size(4) /* RTA_TABLE */ |
270 | + nla_total_size(2) /* RTA_DST */ | |
271 | + nla_total_size(4); /* RTA_PRIORITY */ | |
272 | ||
273 | /* space for nested metrics */ | |
274 | payload += nla_total_size((RTAX_MAX * nla_total_size(4))); | |
275 | ||
276 | if (fi->fib_nhs) { | |
277 | /* Also handles the special case fib_nhs == 1 */ | |
278 | ||
279 | /* each nexthop is packed in an attribute */ | |
280 | size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); | |
281 | ||
282 | /* may contain a gateway attribute */ | |
283 | nhsize += nla_total_size(4); | |
284 | ||
285 | /* all nexthops are packed in a nested attribute */ | |
286 | payload += nla_total_size(fi->fib_nhs * nhsize); | |
287 | } | |
288 | ||
289 | return payload; | |
290 | } | |
291 | ||
1da177e4 | 292 | static int dn_fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event, |
2dfe55b4 | 293 | u32 tb_id, u8 type, u8 scope, void *dst, int dst_len, |
b6544c0b | 294 | struct dn_fib_info *fi, unsigned int flags) |
1da177e4 LT |
295 | { |
296 | struct rtmsg *rtm; | |
297 | struct nlmsghdr *nlh; | |
298 | unsigned char *b = skb->tail; | |
299 | ||
b6544c0b | 300 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*rtm), flags); |
1da177e4 LT |
301 | rtm = NLMSG_DATA(nlh); |
302 | rtm->rtm_family = AF_DECnet; | |
303 | rtm->rtm_dst_len = dst_len; | |
304 | rtm->rtm_src_len = 0; | |
305 | rtm->rtm_tos = 0; | |
306 | rtm->rtm_table = tb_id; | |
9e762a4a | 307 | RTA_PUT_U32(skb, RTA_TABLE, tb_id); |
1da177e4 LT |
308 | rtm->rtm_flags = fi->fib_flags; |
309 | rtm->rtm_scope = scope; | |
310 | rtm->rtm_type = type; | |
311 | if (rtm->rtm_dst_len) | |
312 | RTA_PUT(skb, RTA_DST, 2, dst); | |
313 | rtm->rtm_protocol = fi->fib_protocol; | |
314 | if (fi->fib_priority) | |
315 | RTA_PUT(skb, RTA_PRIORITY, 4, &fi->fib_priority); | |
316 | if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0) | |
317 | goto rtattr_failure; | |
318 | if (fi->fib_nhs == 1) { | |
319 | if (fi->fib_nh->nh_gw) | |
320 | RTA_PUT(skb, RTA_GATEWAY, 2, &fi->fib_nh->nh_gw); | |
321 | if (fi->fib_nh->nh_oif) | |
322 | RTA_PUT(skb, RTA_OIF, sizeof(int), &fi->fib_nh->nh_oif); | |
323 | } | |
324 | if (fi->fib_nhs > 1) { | |
325 | struct rtnexthop *nhp; | |
326 | struct rtattr *mp_head; | |
327 | if (skb_tailroom(skb) <= RTA_SPACE(0)) | |
328 | goto rtattr_failure; | |
329 | mp_head = (struct rtattr *)skb_put(skb, RTA_SPACE(0)); | |
330 | ||
331 | for_nexthops(fi) { | |
332 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) | |
333 | goto rtattr_failure; | |
334 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
335 | nhp->rtnh_flags = nh->nh_flags & 0xFF; | |
336 | nhp->rtnh_hops = nh->nh_weight - 1; | |
337 | nhp->rtnh_ifindex = nh->nh_oif; | |
338 | if (nh->nh_gw) | |
339 | RTA_PUT(skb, RTA_GATEWAY, 2, &nh->nh_gw); | |
340 | nhp->rtnh_len = skb->tail - (unsigned char *)nhp; | |
341 | } endfor_nexthops(fi); | |
342 | mp_head->rta_type = RTA_MULTIPATH; | |
343 | mp_head->rta_len = skb->tail - (u8*)mp_head; | |
344 | } | |
345 | ||
346 | nlh->nlmsg_len = skb->tail - b; | |
347 | return skb->len; | |
348 | ||
349 | ||
350 | nlmsg_failure: | |
351 | rtattr_failure: | |
352 | skb_trim(skb, b - skb->data); | |
26932566 | 353 | return -EMSGSIZE; |
1da177e4 LT |
354 | } |
355 | ||
356 | ||
2dfe55b4 | 357 | static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, u32 tb_id, |
1da177e4 LT |
358 | struct nlmsghdr *nlh, struct netlink_skb_parms *req) |
359 | { | |
360 | struct sk_buff *skb; | |
361 | u32 pid = req ? req->pid : 0; | |
dc738dd8 | 362 | int err = -ENOBUFS; |
1da177e4 | 363 | |
75356f27 | 364 | skb = nlmsg_new(dn_fib_nlmsg_size(DN_FIB_INFO(f)), GFP_KERNEL); |
dc738dd8 TG |
365 | if (skb == NULL) |
366 | goto errout; | |
1da177e4 | 367 | |
dc738dd8 TG |
368 | err = dn_fib_dump_info(skb, pid, nlh->nlmsg_seq, event, tb_id, |
369 | f->fn_type, f->fn_scope, &f->fn_key, z, | |
370 | DN_FIB_INFO(f), 0); | |
26932566 PM |
371 | if (err < 0) { |
372 | /* -EMSGSIZE implies BUG in dn_fib_nlmsg_size() */ | |
373 | WARN_ON(err == -EMSGSIZE); | |
374 | kfree_skb(skb); | |
375 | goto errout; | |
376 | } | |
dc738dd8 TG |
377 | err = rtnl_notify(skb, pid, RTNLGRP_DECnet_ROUTE, nlh, GFP_KERNEL); |
378 | errout: | |
379 | if (err < 0) | |
380 | rtnl_set_sk_err(RTNLGRP_DECnet_ROUTE, err); | |
1da177e4 LT |
381 | } |
382 | ||
383 | static __inline__ int dn_hash_dump_bucket(struct sk_buff *skb, | |
384 | struct netlink_callback *cb, | |
385 | struct dn_fib_table *tb, | |
386 | struct dn_zone *dz, | |
387 | struct dn_fib_node *f) | |
388 | { | |
389 | int i, s_i; | |
390 | ||
abcab268 | 391 | s_i = cb->args[4]; |
1da177e4 LT |
392 | for(i = 0; f; i++, f = f->fn_next) { |
393 | if (i < s_i) | |
394 | continue; | |
395 | if (f->fn_state & DN_S_ZOMBIE) | |
396 | continue; | |
397 | if (dn_fib_dump_info(skb, NETLINK_CB(cb->skb).pid, | |
398 | cb->nlh->nlmsg_seq, | |
399 | RTM_NEWROUTE, | |
400 | tb->n, | |
401 | (f->fn_state & DN_S_ZOMBIE) ? 0 : f->fn_type, | |
402 | f->fn_scope, &f->fn_key, dz->dz_order, | |
b6544c0b | 403 | f->fn_info, NLM_F_MULTI) < 0) { |
abcab268 | 404 | cb->args[4] = i; |
1da177e4 LT |
405 | return -1; |
406 | } | |
407 | } | |
abcab268 | 408 | cb->args[4] = i; |
1da177e4 LT |
409 | return skb->len; |
410 | } | |
411 | ||
412 | static __inline__ int dn_hash_dump_zone(struct sk_buff *skb, | |
413 | struct netlink_callback *cb, | |
414 | struct dn_fib_table *tb, | |
415 | struct dn_zone *dz) | |
416 | { | |
417 | int h, s_h; | |
418 | ||
abcab268 | 419 | s_h = cb->args[3]; |
1da177e4 LT |
420 | for(h = 0; h < dz->dz_divisor; h++) { |
421 | if (h < s_h) | |
422 | continue; | |
423 | if (h > s_h) | |
abcab268 | 424 | memset(&cb->args[4], 0, sizeof(cb->args) - 4*sizeof(cb->args[0])); |
1da177e4 LT |
425 | if (dz->dz_hash == NULL || dz->dz_hash[h] == NULL) |
426 | continue; | |
427 | if (dn_hash_dump_bucket(skb, cb, tb, dz, dz->dz_hash[h]) < 0) { | |
abcab268 | 428 | cb->args[3] = h; |
1da177e4 LT |
429 | return -1; |
430 | } | |
431 | } | |
abcab268 | 432 | cb->args[3] = h; |
1da177e4 LT |
433 | return skb->len; |
434 | } | |
435 | ||
436 | static int dn_fib_table_dump(struct dn_fib_table *tb, struct sk_buff *skb, | |
437 | struct netlink_callback *cb) | |
438 | { | |
439 | int m, s_m; | |
440 | struct dn_zone *dz; | |
441 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
442 | ||
abcab268 | 443 | s_m = cb->args[2]; |
1da177e4 LT |
444 | read_lock(&dn_fib_tables_lock); |
445 | for(dz = table->dh_zone_list, m = 0; dz; dz = dz->dz_next, m++) { | |
446 | if (m < s_m) | |
447 | continue; | |
448 | if (m > s_m) | |
abcab268 | 449 | memset(&cb->args[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0])); |
1da177e4 LT |
450 | |
451 | if (dn_hash_dump_zone(skb, cb, tb, dz) < 0) { | |
abcab268 | 452 | cb->args[2] = m; |
1da177e4 LT |
453 | read_unlock(&dn_fib_tables_lock); |
454 | return -1; | |
455 | } | |
456 | } | |
457 | read_unlock(&dn_fib_tables_lock); | |
abcab268 | 458 | cb->args[2] = m; |
1da177e4 LT |
459 | |
460 | return skb->len; | |
461 | } | |
462 | ||
abcab268 PM |
463 | int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb) |
464 | { | |
465 | unsigned int h, s_h; | |
466 | unsigned int e = 0, s_e; | |
467 | struct dn_fib_table *tb; | |
468 | struct hlist_node *node; | |
469 | int dumped = 0; | |
470 | ||
471 | if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) && | |
472 | ((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED) | |
473 | return dn_cache_dump(skb, cb); | |
474 | ||
475 | s_h = cb->args[0]; | |
476 | s_e = cb->args[1]; | |
477 | ||
478 | for (h = s_h; h < DN_FIB_TABLE_HASHSZ; h++, s_h = 0) { | |
479 | e = 0; | |
480 | hlist_for_each_entry(tb, node, &dn_fib_table_hash[h], hlist) { | |
481 | if (e < s_e) | |
482 | goto next; | |
483 | if (dumped) | |
484 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
485 | 2 * sizeof(cb->args[0])); | |
486 | if (tb->dump(tb, skb, cb) < 0) | |
487 | goto out; | |
488 | dumped = 1; | |
489 | next: | |
490 | e++; | |
491 | } | |
492 | } | |
493 | out: | |
494 | cb->args[1] = e; | |
495 | cb->args[0] = h; | |
496 | ||
497 | return skb->len; | |
498 | } | |
499 | ||
1da177e4 LT |
500 | 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) |
501 | { | |
502 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
503 | struct dn_fib_node *new_f, *f, **fp, **del_fp; | |
504 | struct dn_zone *dz; | |
505 | struct dn_fib_info *fi; | |
506 | int z = r->rtm_dst_len; | |
507 | int type = r->rtm_type; | |
508 | dn_fib_key_t key; | |
509 | int err; | |
510 | ||
511 | if (z > 16) | |
512 | return -EINVAL; | |
513 | ||
514 | dz = table->dh_zones[z]; | |
515 | if (!dz && !(dz = dn_new_zone(table, z))) | |
516 | return -ENOBUFS; | |
517 | ||
518 | dz_key_0(key); | |
519 | if (rta->rta_dst) { | |
c4ea94ab | 520 | __le16 dst; |
1da177e4 LT |
521 | memcpy(&dst, rta->rta_dst, 2); |
522 | if (dst & ~DZ_MASK(dz)) | |
523 | return -EINVAL; | |
524 | key = dz_key(dst, dz); | |
525 | } | |
526 | ||
527 | if ((fi = dn_fib_create_info(r, rta, n, &err)) == NULL) | |
528 | return err; | |
529 | ||
530 | if (dz->dz_nent > (dz->dz_divisor << 2) && | |
531 | dz->dz_divisor > DN_MAX_DIVISOR && | |
532 | (z==16 || (1<<z) > dz->dz_divisor)) | |
533 | dn_rehash_zone(dz); | |
534 | ||
535 | fp = dn_chain_p(key, dz); | |
536 | ||
537 | DN_FIB_SCAN(f, fp) { | |
538 | if (dn_key_leq(key, f->fn_key)) | |
539 | break; | |
540 | } | |
541 | ||
542 | del_fp = NULL; | |
543 | ||
544 | if (f && (f->fn_state & DN_S_ZOMBIE) && | |
545 | dn_key_eq(f->fn_key, key)) { | |
546 | del_fp = fp; | |
547 | fp = &f->fn_next; | |
548 | f = *fp; | |
549 | goto create; | |
550 | } | |
551 | ||
552 | DN_FIB_SCAN_KEY(f, fp, key) { | |
553 | if (fi->fib_priority <= DN_FIB_INFO(f)->fib_priority) | |
554 | break; | |
555 | } | |
556 | ||
557 | if (f && dn_key_eq(f->fn_key, key) && | |
558 | fi->fib_priority == DN_FIB_INFO(f)->fib_priority) { | |
559 | struct dn_fib_node **ins_fp; | |
560 | ||
561 | err = -EEXIST; | |
562 | if (n->nlmsg_flags & NLM_F_EXCL) | |
563 | goto out; | |
564 | ||
565 | if (n->nlmsg_flags & NLM_F_REPLACE) { | |
566 | del_fp = fp; | |
567 | fp = &f->fn_next; | |
568 | f = *fp; | |
569 | goto replace; | |
570 | } | |
571 | ||
572 | ins_fp = fp; | |
573 | err = -EEXIST; | |
574 | ||
575 | DN_FIB_SCAN_KEY(f, fp, key) { | |
576 | if (fi->fib_priority != DN_FIB_INFO(f)->fib_priority) | |
577 | break; | |
578 | if (f->fn_type == type && f->fn_scope == r->rtm_scope | |
579 | && DN_FIB_INFO(f) == fi) | |
580 | goto out; | |
581 | } | |
582 | ||
583 | if (!(n->nlmsg_flags & NLM_F_APPEND)) { | |
584 | fp = ins_fp; | |
585 | f = *fp; | |
586 | } | |
587 | } | |
588 | ||
589 | create: | |
590 | err = -ENOENT; | |
591 | if (!(n->nlmsg_flags & NLM_F_CREATE)) | |
592 | goto out; | |
593 | ||
594 | replace: | |
595 | err = -ENOBUFS; | |
c3762229 | 596 | new_f = kmem_cache_zalloc(dn_hash_kmem, GFP_KERNEL); |
1da177e4 LT |
597 | if (new_f == NULL) |
598 | goto out; | |
599 | ||
1da177e4 LT |
600 | new_f->fn_key = key; |
601 | new_f->fn_type = type; | |
602 | new_f->fn_scope = r->rtm_scope; | |
603 | DN_FIB_INFO(new_f) = fi; | |
604 | ||
605 | new_f->fn_next = f; | |
606 | write_lock_bh(&dn_fib_tables_lock); | |
607 | *fp = new_f; | |
608 | write_unlock_bh(&dn_fib_tables_lock); | |
609 | dz->dz_nent++; | |
610 | ||
611 | if (del_fp) { | |
612 | f = *del_fp; | |
613 | write_lock_bh(&dn_fib_tables_lock); | |
614 | *del_fp = f->fn_next; | |
615 | write_unlock_bh(&dn_fib_tables_lock); | |
616 | ||
617 | if (!(f->fn_state & DN_S_ZOMBIE)) | |
618 | dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req); | |
619 | if (f->fn_state & DN_S_ACCESSED) | |
620 | dn_rt_cache_flush(-1); | |
621 | dn_free_node(f); | |
622 | dz->dz_nent--; | |
623 | } else { | |
624 | dn_rt_cache_flush(-1); | |
625 | } | |
626 | ||
627 | dn_rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->n, n, req); | |
628 | ||
629 | return 0; | |
630 | out: | |
631 | dn_fib_release_info(fi); | |
632 | return err; | |
633 | } | |
634 | ||
635 | ||
636 | 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) | |
637 | { | |
638 | struct dn_hash *table = (struct dn_hash*)tb->data; | |
639 | struct dn_fib_node **fp, **del_fp, *f; | |
640 | int z = r->rtm_dst_len; | |
641 | struct dn_zone *dz; | |
642 | dn_fib_key_t key; | |
643 | int matched; | |
644 | ||
645 | ||
646 | if (z > 16) | |
647 | return -EINVAL; | |
648 | ||
649 | if ((dz = table->dh_zones[z]) == NULL) | |
650 | return -ESRCH; | |
651 | ||
652 | dz_key_0(key); | |
653 | if (rta->rta_dst) { | |
c4ea94ab | 654 | __le16 dst; |
1da177e4 LT |
655 | memcpy(&dst, rta->rta_dst, 2); |
656 | if (dst & ~DZ_MASK(dz)) | |
657 | return -EINVAL; | |
658 | key = dz_key(dst, dz); | |
659 | } | |
660 | ||
661 | fp = dn_chain_p(key, dz); | |
662 | ||
663 | DN_FIB_SCAN(f, fp) { | |
664 | if (dn_key_eq(f->fn_key, key)) | |
665 | break; | |
666 | if (dn_key_leq(key, f->fn_key)) | |
667 | return -ESRCH; | |
668 | } | |
669 | ||
670 | matched = 0; | |
671 | del_fp = NULL; | |
672 | DN_FIB_SCAN_KEY(f, fp, key) { | |
673 | struct dn_fib_info *fi = DN_FIB_INFO(f); | |
674 | ||
675 | if (f->fn_state & DN_S_ZOMBIE) | |
676 | return -ESRCH; | |
677 | ||
678 | matched++; | |
679 | ||
680 | if (del_fp == NULL && | |
681 | (!r->rtm_type || f->fn_type == r->rtm_type) && | |
682 | (r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) && | |
683 | (!r->rtm_protocol || | |
684 | fi->fib_protocol == r->rtm_protocol) && | |
685 | dn_fib_nh_match(r, n, rta, fi) == 0) | |
686 | del_fp = fp; | |
687 | } | |
688 | ||
689 | if (del_fp) { | |
690 | f = *del_fp; | |
691 | dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req); | |
692 | ||
693 | if (matched != 1) { | |
694 | write_lock_bh(&dn_fib_tables_lock); | |
695 | *del_fp = f->fn_next; | |
696 | write_unlock_bh(&dn_fib_tables_lock); | |
697 | ||
698 | if (f->fn_state & DN_S_ACCESSED) | |
699 | dn_rt_cache_flush(-1); | |
700 | dn_free_node(f); | |
701 | dz->dz_nent--; | |
702 | } else { | |
703 | f->fn_state |= DN_S_ZOMBIE; | |
704 | if (f->fn_state & DN_S_ACCESSED) { | |
705 | f->fn_state &= ~DN_S_ACCESSED; | |
706 | dn_rt_cache_flush(-1); | |
707 | } | |
708 | if (++dn_fib_hash_zombies > 128) | |
709 | dn_fib_flush(); | |
710 | } | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
715 | return -ESRCH; | |
716 | } | |
717 | ||
718 | static inline int dn_flush_list(struct dn_fib_node **fp, int z, struct dn_hash *table) | |
719 | { | |
720 | int found = 0; | |
721 | struct dn_fib_node *f; | |
722 | ||
723 | while((f = *fp) != NULL) { | |
724 | struct dn_fib_info *fi = DN_FIB_INFO(f); | |
725 | ||
726 | if (fi && ((f->fn_state & DN_S_ZOMBIE) || (fi->fib_flags & RTNH_F_DEAD))) { | |
727 | write_lock_bh(&dn_fib_tables_lock); | |
728 | *fp = f->fn_next; | |
729 | write_unlock_bh(&dn_fib_tables_lock); | |
730 | ||
731 | dn_free_node(f); | |
732 | found++; | |
733 | continue; | |
734 | } | |
735 | fp = &f->fn_next; | |
736 | } | |
737 | ||
738 | return found; | |
739 | } | |
740 | ||
741 | static int dn_fib_table_flush(struct dn_fib_table *tb) | |
742 | { | |
743 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
744 | struct dn_zone *dz; | |
745 | int found = 0; | |
746 | ||
747 | dn_fib_hash_zombies = 0; | |
748 | for(dz = table->dh_zone_list; dz; dz = dz->dz_next) { | |
749 | int i; | |
750 | int tmp = 0; | |
751 | for(i = dz->dz_divisor-1; i >= 0; i--) | |
752 | tmp += dn_flush_list(&dz->dz_hash[i], dz->dz_order, table); | |
753 | dz->dz_nent -= tmp; | |
754 | found += tmp; | |
755 | } | |
756 | ||
757 | return found; | |
758 | } | |
759 | ||
760 | static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct flowi *flp, struct dn_fib_res *res) | |
761 | { | |
762 | int err; | |
763 | struct dn_zone *dz; | |
764 | struct dn_hash *t = (struct dn_hash *)tb->data; | |
765 | ||
766 | read_lock(&dn_fib_tables_lock); | |
767 | for(dz = t->dh_zone_list; dz; dz = dz->dz_next) { | |
768 | struct dn_fib_node *f; | |
769 | dn_fib_key_t k = dz_key(flp->fld_dst, dz); | |
770 | ||
771 | for(f = dz_chain(k, dz); f; f = f->fn_next) { | |
772 | if (!dn_key_eq(k, f->fn_key)) { | |
773 | if (dn_key_leq(k, f->fn_key)) | |
774 | break; | |
775 | else | |
776 | continue; | |
777 | } | |
778 | ||
779 | f->fn_state |= DN_S_ACCESSED; | |
780 | ||
781 | if (f->fn_state&DN_S_ZOMBIE) | |
782 | continue; | |
783 | ||
784 | if (f->fn_scope < flp->fld_scope) | |
785 | continue; | |
786 | ||
787 | err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), flp, res); | |
788 | ||
789 | if (err == 0) { | |
790 | res->type = f->fn_type; | |
791 | res->scope = f->fn_scope; | |
792 | res->prefixlen = dz->dz_order; | |
793 | goto out; | |
794 | } | |
795 | if (err < 0) | |
796 | goto out; | |
797 | } | |
798 | } | |
799 | err = 1; | |
800 | out: | |
801 | read_unlock(&dn_fib_tables_lock); | |
802 | return err; | |
803 | } | |
804 | ||
805 | ||
2dfe55b4 | 806 | struct dn_fib_table *dn_fib_get_table(u32 n, int create) |
1da177e4 LT |
807 | { |
808 | struct dn_fib_table *t; | |
abcab268 PM |
809 | struct hlist_node *node; |
810 | unsigned int h; | |
1da177e4 LT |
811 | |
812 | if (n < RT_TABLE_MIN) | |
813 | return NULL; | |
814 | ||
815 | if (n > RT_TABLE_MAX) | |
816 | return NULL; | |
817 | ||
abcab268 PM |
818 | h = n & (DN_FIB_TABLE_HASHSZ - 1); |
819 | rcu_read_lock(); | |
820 | hlist_for_each_entry_rcu(t, node, &dn_fib_table_hash[h], hlist) { | |
821 | if (t->n == n) { | |
822 | rcu_read_unlock(); | |
823 | return t; | |
824 | } | |
825 | } | |
826 | rcu_read_unlock(); | |
1da177e4 LT |
827 | |
828 | if (!create) | |
829 | return NULL; | |
830 | ||
831 | if (in_interrupt() && net_ratelimit()) { | |
832 | printk(KERN_DEBUG "DECnet: BUG! Attempt to create routing table from interrupt\n"); | |
833 | return NULL; | |
834 | } | |
1da177e4 | 835 | |
e6b61105 ACM |
836 | t = kzalloc(sizeof(struct dn_fib_table) + sizeof(struct dn_hash), |
837 | GFP_KERNEL); | |
838 | if (t == NULL) | |
839 | return NULL; | |
1da177e4 LT |
840 | |
841 | t->n = n; | |
842 | t->insert = dn_fib_table_insert; | |
843 | t->delete = dn_fib_table_delete; | |
844 | t->lookup = dn_fib_table_lookup; | |
845 | t->flush = dn_fib_table_flush; | |
846 | t->dump = dn_fib_table_dump; | |
abcab268 | 847 | hlist_add_head_rcu(&t->hlist, &dn_fib_table_hash[h]); |
1da177e4 LT |
848 | |
849 | return t; | |
850 | } | |
851 | ||
1da177e4 LT |
852 | struct dn_fib_table *dn_fib_empty_table(void) |
853 | { | |
2dfe55b4 | 854 | u32 id; |
1da177e4 LT |
855 | |
856 | for(id = RT_TABLE_MIN; id <= RT_TABLE_MAX; id++) | |
abcab268 | 857 | if (dn_fib_get_table(id, 0) == NULL) |
1da177e4 LT |
858 | return dn_fib_get_table(id, 1); |
859 | return NULL; | |
860 | } | |
861 | ||
abcab268 PM |
862 | void dn_fib_flush(void) |
863 | { | |
864 | int flushed = 0; | |
865 | struct dn_fib_table *tb; | |
866 | struct hlist_node *node; | |
867 | unsigned int h; | |
868 | ||
869 | for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) { | |
870 | hlist_for_each_entry(tb, node, &dn_fib_table_hash[h], hlist) | |
871 | flushed += tb->flush(tb); | |
872 | } | |
873 | ||
874 | if (flushed) | |
875 | dn_rt_cache_flush(-1); | |
876 | } | |
877 | ||
1da177e4 LT |
878 | void __init dn_fib_table_init(void) |
879 | { | |
880 | dn_hash_kmem = kmem_cache_create("dn_fib_info_cache", | |
881 | sizeof(struct dn_fib_info), | |
882 | 0, SLAB_HWCACHE_ALIGN, | |
883 | NULL, NULL); | |
884 | } | |
885 | ||
886 | void __exit dn_fib_table_cleanup(void) | |
887 | { | |
abcab268 PM |
888 | struct dn_fib_table *t; |
889 | struct hlist_node *node, *next; | |
890 | unsigned int h; | |
1da177e4 | 891 | |
abcab268 PM |
892 | write_lock(&dn_fib_tables_lock); |
893 | for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) { | |
894 | hlist_for_each_entry_safe(t, node, next, &dn_fib_table_hash[h], | |
895 | hlist) { | |
896 | hlist_del(&t->hlist); | |
897 | kfree(t); | |
898 | } | |
899 | } | |
900 | write_unlock(&dn_fib_tables_lock); | |
1da177e4 | 901 | } |