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> | |
dc5fc579 | 31 | #include <net/netlink.h> |
1da177e4 LT |
32 | #include <net/dst.h> |
33 | #include <net/flow.h> | |
a8731cbf | 34 | #include <net/fib_rules.h> |
1da177e4 LT |
35 | #include <net/dn.h> |
36 | #include <net/dn_route.h> | |
37 | #include <net/dn_fib.h> | |
38 | #include <net/dn_neigh.h> | |
39 | #include <net/dn_dev.h> | |
40 | ||
41 | struct dn_zone | |
42 | { | |
43 | struct dn_zone *dz_next; | |
44 | struct dn_fib_node **dz_hash; | |
45 | int dz_nent; | |
46 | int dz_divisor; | |
47 | u32 dz_hashmask; | |
48 | #define DZ_HASHMASK(dz) ((dz)->dz_hashmask) | |
49 | int dz_order; | |
c4ea94ab | 50 | __le16 dz_mask; |
1da177e4 LT |
51 | #define DZ_MASK(dz) ((dz)->dz_mask) |
52 | }; | |
53 | ||
54 | struct dn_hash | |
55 | { | |
56 | struct dn_zone *dh_zones[17]; | |
57 | struct dn_zone *dh_zone_list; | |
58 | }; | |
59 | ||
60 | #define dz_key_0(key) ((key).datum = 0) | |
61 | #define dz_prefix(key,dz) ((key).datum) | |
62 | ||
63 | #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\ | |
429eb0fa | 64 | for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++) |
1da177e4 LT |
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 | |
abcab268 PM |
79 | #define DN_FIB_TABLE_HASHSZ 256 |
80 | static struct hlist_head dn_fib_table_hash[DN_FIB_TABLE_HASHSZ]; | |
1da177e4 | 81 | static DEFINE_RWLOCK(dn_fib_tables_lock); |
1da177e4 | 82 | |
e18b890b | 83 | static struct kmem_cache *dn_hash_kmem __read_mostly; |
1da177e4 LT |
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 | { | |
c4106aa8 | 88 | u16 h = le16_to_cpu(key.datum)>>(16 - dz->dz_order); |
1da177e4 LT |
89 | h ^= (h >> 10); |
90 | h ^= (h >> 6); | |
91 | h &= DZ_HASHMASK(dz); | |
92 | return *(dn_fib_idx_t *)&h; | |
93 | } | |
94 | ||
c4ea94ab | 95 | static inline dn_fib_key_t dz_key(__le16 dst, struct dn_zone *dz) |
1da177e4 LT |
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 | int i; | |
127 | struct dn_fib_node *f, **fp, *next; | |
128 | ||
129 | for(i = 0; i < old_divisor; i++) { | |
130 | for(f = old_ht[i]; f; f = f->fn_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 | ||
0da974f4 | 163 | ht = kcalloc(new_divisor, sizeof(struct dn_fib_node*), GFP_KERNEL); |
1da177e4 LT |
164 | if (ht == NULL) |
165 | return; | |
166 | ||
1da177e4 LT |
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; | |
0da974f4 | 187 | struct dn_zone *dz = kzalloc(sizeof(struct dn_zone), GFP_KERNEL); |
1da177e4 LT |
188 | if (!dz) |
189 | return NULL; | |
190 | ||
1da177e4 LT |
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 | ||
0da974f4 | 199 | dz->dz_hash = kcalloc(dz->dz_divisor, sizeof(struct dn_fib_node *), GFP_KERNEL); |
1da177e4 LT |
200 | if (!dz->dz_hash) { |
201 | kfree(dz); | |
202 | return NULL; | |
203 | } | |
204 | ||
1da177e4 LT |
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); | |
c4ea94ab | 249 | __le16 gw; |
1da177e4 LT |
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 | ||
339bf98f TG |
267 | static inline size_t dn_fib_nlmsg_size(struct dn_fib_info *fi) |
268 | { | |
75356f27 | 269 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) |
339bf98f TG |
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 | ||
1da177e4 | 293 | static int dn_fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event, |
429eb0fa YH |
294 | u32 tb_id, u8 type, u8 scope, void *dst, int dst_len, |
295 | struct dn_fib_info *fi, unsigned int flags) | |
1da177e4 | 296 | { |
429eb0fa YH |
297 | struct rtmsg *rtm; |
298 | struct nlmsghdr *nlh; | |
27a884dc | 299 | unsigned char *b = skb_tail_pointer(skb); |
429eb0fa YH |
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; | |
9e762a4a | 308 | RTA_PUT_U32(skb, RTA_TABLE, tb_id); |
429eb0fa YH |
309 | rtm->rtm_flags = fi->fib_flags; |
310 | rtm->rtm_scope = scope; | |
1da177e4 | 311 | rtm->rtm_type = type; |
429eb0fa YH |
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); | |
1da177e4 LT |
317 | if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0) |
318 | goto rtattr_failure; | |
429eb0fa YH |
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); | |
27a884dc | 341 | nhp->rtnh_len = skb_tail_pointer(skb) - (unsigned char *)nhp; |
429eb0fa YH |
342 | } endfor_nexthops(fi); |
343 | mp_head->rta_type = RTA_MULTIPATH; | |
27a884dc | 344 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
429eb0fa YH |
345 | } |
346 | ||
27a884dc | 347 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
429eb0fa | 348 | return skb->len; |
1da177e4 LT |
349 | |
350 | ||
351 | nlmsg_failure: | |
352 | rtattr_failure: | |
dc5fc579 | 353 | nlmsg_trim(skb, b); |
429eb0fa | 354 | return -EMSGSIZE; |
1da177e4 LT |
355 | } |
356 | ||
357 | ||
2dfe55b4 | 358 | static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, u32 tb_id, |
429eb0fa | 359 | struct nlmsghdr *nlh, struct netlink_skb_parms *req) |
1da177e4 | 360 | { |
429eb0fa YH |
361 | struct sk_buff *skb; |
362 | u32 pid = req ? req->pid : 0; | |
dc738dd8 | 363 | int err = -ENOBUFS; |
1da177e4 | 364 | |
429eb0fa YH |
365 | skb = nlmsg_new(dn_fib_nlmsg_size(DN_FIB_INFO(f)), GFP_KERNEL); |
366 | if (skb == NULL) | |
dc738dd8 | 367 | goto errout; |
1da177e4 | 368 | |
429eb0fa | 369 | err = dn_fib_dump_info(skb, pid, nlh->nlmsg_seq, event, tb_id, |
dc738dd8 TG |
370 | f->fn_type, f->fn_scope, &f->fn_key, z, |
371 | DN_FIB_INFO(f), 0); | |
26932566 PM |
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 | } | |
97c53cac | 378 | err = rtnl_notify(skb, &init_net, pid, RTNLGRP_DECnet_ROUTE, nlh, GFP_KERNEL); |
dc738dd8 TG |
379 | errout: |
380 | if (err < 0) | |
97c53cac | 381 | rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_ROUTE, err); |
1da177e4 LT |
382 | } |
383 | ||
429eb0fa | 384 | static __inline__ int dn_hash_dump_bucket(struct sk_buff *skb, |
1da177e4 LT |
385 | struct netlink_callback *cb, |
386 | struct dn_fib_table *tb, | |
387 | struct dn_zone *dz, | |
388 | struct dn_fib_node *f) | |
389 | { | |
390 | int i, s_i; | |
391 | ||
abcab268 | 392 | s_i = cb->args[4]; |
1da177e4 LT |
393 | for(i = 0; f; i++, f = f->fn_next) { |
394 | if (i < s_i) | |
395 | continue; | |
396 | if (f->fn_state & DN_S_ZOMBIE) | |
397 | continue; | |
429eb0fa | 398 | if (dn_fib_dump_info(skb, NETLINK_CB(cb->skb).pid, |
1da177e4 LT |
399 | cb->nlh->nlmsg_seq, |
400 | RTM_NEWROUTE, | |
429eb0fa | 401 | tb->n, |
1da177e4 | 402 | (f->fn_state & DN_S_ZOMBIE) ? 0 : f->fn_type, |
429eb0fa | 403 | f->fn_scope, &f->fn_key, dz->dz_order, |
b6544c0b | 404 | f->fn_info, NLM_F_MULTI) < 0) { |
abcab268 | 405 | cb->args[4] = i; |
1da177e4 LT |
406 | return -1; |
407 | } | |
408 | } | |
abcab268 | 409 | cb->args[4] = i; |
1da177e4 LT |
410 | return skb->len; |
411 | } | |
412 | ||
429eb0fa | 413 | static __inline__ int dn_hash_dump_zone(struct sk_buff *skb, |
1da177e4 LT |
414 | struct netlink_callback *cb, |
415 | struct dn_fib_table *tb, | |
416 | struct dn_zone *dz) | |
417 | { | |
418 | int h, s_h; | |
419 | ||
abcab268 | 420 | s_h = cb->args[3]; |
1da177e4 LT |
421 | for(h = 0; h < dz->dz_divisor; h++) { |
422 | if (h < s_h) | |
423 | continue; | |
424 | if (h > s_h) | |
abcab268 | 425 | memset(&cb->args[4], 0, sizeof(cb->args) - 4*sizeof(cb->args[0])); |
1da177e4 LT |
426 | if (dz->dz_hash == NULL || dz->dz_hash[h] == NULL) |
427 | continue; | |
428 | if (dn_hash_dump_bucket(skb, cb, tb, dz, dz->dz_hash[h]) < 0) { | |
abcab268 | 429 | cb->args[3] = h; |
1da177e4 LT |
430 | return -1; |
431 | } | |
432 | } | |
abcab268 | 433 | cb->args[3] = h; |
1da177e4 LT |
434 | return skb->len; |
435 | } | |
436 | ||
429eb0fa YH |
437 | static int dn_fib_table_dump(struct dn_fib_table *tb, struct sk_buff *skb, |
438 | struct netlink_callback *cb) | |
1da177e4 | 439 | { |
429eb0fa | 440 | int m, s_m; |
1da177e4 LT |
441 | struct dn_zone *dz; |
442 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
443 | ||
abcab268 | 444 | s_m = cb->args[2]; |
1da177e4 LT |
445 | read_lock(&dn_fib_tables_lock); |
446 | for(dz = table->dh_zone_list, m = 0; dz; dz = dz->dz_next, m++) { | |
447 | if (m < s_m) | |
448 | continue; | |
449 | if (m > s_m) | |
abcab268 | 450 | memset(&cb->args[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0])); |
1da177e4 LT |
451 | |
452 | if (dn_hash_dump_zone(skb, cb, tb, dz) < 0) { | |
abcab268 | 453 | cb->args[2] = m; |
1da177e4 LT |
454 | read_unlock(&dn_fib_tables_lock); |
455 | return -1; | |
456 | } | |
457 | } | |
458 | read_unlock(&dn_fib_tables_lock); | |
abcab268 | 459 | cb->args[2] = m; |
1da177e4 | 460 | |
429eb0fa | 461 | return skb->len; |
1da177e4 LT |
462 | } |
463 | ||
abcab268 PM |
464 | int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb) |
465 | { | |
3b1e0a65 | 466 | struct net *net = sock_net(skb->sk); |
abcab268 PM |
467 | unsigned int h, s_h; |
468 | unsigned int e = 0, s_e; | |
469 | struct dn_fib_table *tb; | |
470 | struct hlist_node *node; | |
471 | int dumped = 0; | |
472 | ||
b854272b DL |
473 | if (net != &init_net) |
474 | return 0; | |
475 | ||
abcab268 PM |
476 | if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) && |
477 | ((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED) | |
478 | return dn_cache_dump(skb, cb); | |
479 | ||
480 | s_h = cb->args[0]; | |
481 | s_e = cb->args[1]; | |
482 | ||
483 | for (h = s_h; h < DN_FIB_TABLE_HASHSZ; h++, s_h = 0) { | |
484 | e = 0; | |
485 | hlist_for_each_entry(tb, node, &dn_fib_table_hash[h], hlist) { | |
486 | if (e < s_e) | |
487 | goto next; | |
488 | if (dumped) | |
489 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
429eb0fa | 490 | 2 * sizeof(cb->args[0])); |
abcab268 PM |
491 | if (tb->dump(tb, skb, cb) < 0) |
492 | goto out; | |
493 | dumped = 1; | |
494 | next: | |
495 | e++; | |
496 | } | |
497 | } | |
498 | out: | |
499 | cb->args[1] = e; | |
500 | cb->args[0] = h; | |
501 | ||
502 | return skb->len; | |
503 | } | |
504 | ||
1da177e4 LT |
505 | 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) |
506 | { | |
507 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
508 | struct dn_fib_node *new_f, *f, **fp, **del_fp; | |
509 | struct dn_zone *dz; | |
510 | struct dn_fib_info *fi; | |
429eb0fa | 511 | int z = r->rtm_dst_len; |
1da177e4 LT |
512 | int type = r->rtm_type; |
513 | dn_fib_key_t key; | |
429eb0fa | 514 | int err; |
1da177e4 | 515 | |
429eb0fa YH |
516 | if (z > 16) |
517 | return -EINVAL; | |
1da177e4 LT |
518 | |
519 | dz = table->dh_zones[z]; | |
520 | if (!dz && !(dz = dn_new_zone(table, z))) | |
521 | return -ENOBUFS; | |
522 | ||
523 | dz_key_0(key); | |
524 | if (rta->rta_dst) { | |
c4ea94ab | 525 | __le16 dst; |
1da177e4 LT |
526 | memcpy(&dst, rta->rta_dst, 2); |
527 | if (dst & ~DZ_MASK(dz)) | |
528 | return -EINVAL; | |
529 | key = dz_key(dst, dz); | |
530 | } | |
531 | ||
429eb0fa YH |
532 | if ((fi = dn_fib_create_info(r, rta, n, &err)) == NULL) |
533 | return err; | |
1da177e4 LT |
534 | |
535 | if (dz->dz_nent > (dz->dz_divisor << 2) && | |
536 | dz->dz_divisor > DN_MAX_DIVISOR && | |
537 | (z==16 || (1<<z) > dz->dz_divisor)) | |
538 | dn_rehash_zone(dz); | |
539 | ||
540 | fp = dn_chain_p(key, dz); | |
541 | ||
542 | DN_FIB_SCAN(f, fp) { | |
543 | if (dn_key_leq(key, f->fn_key)) | |
544 | break; | |
545 | } | |
546 | ||
547 | del_fp = NULL; | |
548 | ||
549 | if (f && (f->fn_state & DN_S_ZOMBIE) && | |
550 | dn_key_eq(f->fn_key, key)) { | |
551 | del_fp = fp; | |
552 | fp = &f->fn_next; | |
553 | f = *fp; | |
554 | goto create; | |
555 | } | |
556 | ||
557 | DN_FIB_SCAN_KEY(f, fp, key) { | |
558 | if (fi->fib_priority <= DN_FIB_INFO(f)->fib_priority) | |
559 | break; | |
560 | } | |
561 | ||
562 | if (f && dn_key_eq(f->fn_key, key) && | |
563 | fi->fib_priority == DN_FIB_INFO(f)->fib_priority) { | |
564 | struct dn_fib_node **ins_fp; | |
565 | ||
566 | err = -EEXIST; | |
567 | if (n->nlmsg_flags & NLM_F_EXCL) | |
568 | goto out; | |
569 | ||
570 | if (n->nlmsg_flags & NLM_F_REPLACE) { | |
571 | del_fp = fp; | |
572 | fp = &f->fn_next; | |
573 | f = *fp; | |
574 | goto replace; | |
575 | } | |
576 | ||
577 | ins_fp = fp; | |
578 | err = -EEXIST; | |
579 | ||
580 | DN_FIB_SCAN_KEY(f, fp, key) { | |
581 | if (fi->fib_priority != DN_FIB_INFO(f)->fib_priority) | |
582 | break; | |
583 | if (f->fn_type == type && f->fn_scope == r->rtm_scope | |
584 | && DN_FIB_INFO(f) == fi) | |
585 | goto out; | |
586 | } | |
587 | ||
588 | if (!(n->nlmsg_flags & NLM_F_APPEND)) { | |
589 | fp = ins_fp; | |
590 | f = *fp; | |
591 | } | |
592 | } | |
593 | ||
594 | create: | |
595 | err = -ENOENT; | |
596 | if (!(n->nlmsg_flags & NLM_F_CREATE)) | |
597 | goto out; | |
598 | ||
599 | replace: | |
600 | err = -ENOBUFS; | |
c3762229 | 601 | new_f = kmem_cache_zalloc(dn_hash_kmem, GFP_KERNEL); |
1da177e4 LT |
602 | if (new_f == NULL) |
603 | goto out; | |
604 | ||
1da177e4 LT |
605 | new_f->fn_key = key; |
606 | new_f->fn_type = type; | |
607 | new_f->fn_scope = r->rtm_scope; | |
608 | DN_FIB_INFO(new_f) = fi; | |
609 | ||
610 | new_f->fn_next = f; | |
611 | write_lock_bh(&dn_fib_tables_lock); | |
612 | *fp = new_f; | |
613 | write_unlock_bh(&dn_fib_tables_lock); | |
614 | dz->dz_nent++; | |
615 | ||
616 | if (del_fp) { | |
617 | f = *del_fp; | |
618 | write_lock_bh(&dn_fib_tables_lock); | |
619 | *del_fp = f->fn_next; | |
620 | write_unlock_bh(&dn_fib_tables_lock); | |
621 | ||
622 | if (!(f->fn_state & DN_S_ZOMBIE)) | |
623 | dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req); | |
624 | if (f->fn_state & DN_S_ACCESSED) | |
625 | dn_rt_cache_flush(-1); | |
626 | dn_free_node(f); | |
627 | dz->dz_nent--; | |
628 | } else { | |
629 | dn_rt_cache_flush(-1); | |
630 | } | |
631 | ||
429eb0fa | 632 | dn_rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->n, n, req); |
1da177e4 | 633 | |
429eb0fa | 634 | return 0; |
1da177e4 LT |
635 | out: |
636 | dn_fib_release_info(fi); | |
637 | return err; | |
638 | } | |
639 | ||
640 | ||
641 | 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) | |
642 | { | |
643 | struct dn_hash *table = (struct dn_hash*)tb->data; | |
644 | struct dn_fib_node **fp, **del_fp, *f; | |
429eb0fa | 645 | int z = r->rtm_dst_len; |
1da177e4 LT |
646 | struct dn_zone *dz; |
647 | dn_fib_key_t key; | |
648 | int matched; | |
649 | ||
650 | ||
429eb0fa YH |
651 | if (z > 16) |
652 | return -EINVAL; | |
1da177e4 LT |
653 | |
654 | if ((dz = table->dh_zones[z]) == NULL) | |
655 | return -ESRCH; | |
656 | ||
657 | dz_key_0(key); | |
658 | if (rta->rta_dst) { | |
c4ea94ab | 659 | __le16 dst; |
1da177e4 LT |
660 | memcpy(&dst, rta->rta_dst, 2); |
661 | if (dst & ~DZ_MASK(dz)) | |
662 | return -EINVAL; | |
663 | key = dz_key(dst, dz); | |
664 | } | |
665 | ||
666 | fp = dn_chain_p(key, dz); | |
667 | ||
668 | DN_FIB_SCAN(f, fp) { | |
669 | if (dn_key_eq(f->fn_key, key)) | |
670 | break; | |
671 | if (dn_key_leq(key, f->fn_key)) | |
672 | return -ESRCH; | |
673 | } | |
674 | ||
675 | matched = 0; | |
676 | del_fp = NULL; | |
677 | DN_FIB_SCAN_KEY(f, fp, key) { | |
678 | struct dn_fib_info *fi = DN_FIB_INFO(f); | |
679 | ||
680 | if (f->fn_state & DN_S_ZOMBIE) | |
681 | return -ESRCH; | |
682 | ||
683 | matched++; | |
684 | ||
685 | if (del_fp == NULL && | |
686 | (!r->rtm_type || f->fn_type == r->rtm_type) && | |
687 | (r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) && | |
429eb0fa | 688 | (!r->rtm_protocol || |
1da177e4 LT |
689 | fi->fib_protocol == r->rtm_protocol) && |
690 | dn_fib_nh_match(r, n, rta, fi) == 0) | |
691 | del_fp = fp; | |
692 | } | |
693 | ||
694 | if (del_fp) { | |
695 | f = *del_fp; | |
429eb0fa | 696 | dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req); |
1da177e4 LT |
697 | |
698 | if (matched != 1) { | |
699 | write_lock_bh(&dn_fib_tables_lock); | |
700 | *del_fp = f->fn_next; | |
701 | write_unlock_bh(&dn_fib_tables_lock); | |
702 | ||
703 | if (f->fn_state & DN_S_ACCESSED) | |
704 | dn_rt_cache_flush(-1); | |
705 | dn_free_node(f); | |
706 | dz->dz_nent--; | |
707 | } else { | |
708 | f->fn_state |= DN_S_ZOMBIE; | |
709 | if (f->fn_state & DN_S_ACCESSED) { | |
710 | f->fn_state &= ~DN_S_ACCESSED; | |
711 | dn_rt_cache_flush(-1); | |
712 | } | |
713 | if (++dn_fib_hash_zombies > 128) | |
714 | dn_fib_flush(); | |
715 | } | |
716 | ||
717 | return 0; | |
718 | } | |
719 | ||
429eb0fa | 720 | return -ESRCH; |
1da177e4 LT |
721 | } |
722 | ||
723 | static inline int dn_flush_list(struct dn_fib_node **fp, int z, struct dn_hash *table) | |
724 | { | |
725 | int found = 0; | |
726 | struct dn_fib_node *f; | |
727 | ||
728 | while((f = *fp) != NULL) { | |
729 | struct dn_fib_info *fi = DN_FIB_INFO(f); | |
730 | ||
731 | if (fi && ((f->fn_state & DN_S_ZOMBIE) || (fi->fib_flags & RTNH_F_DEAD))) { | |
732 | write_lock_bh(&dn_fib_tables_lock); | |
733 | *fp = f->fn_next; | |
734 | write_unlock_bh(&dn_fib_tables_lock); | |
735 | ||
736 | dn_free_node(f); | |
737 | found++; | |
738 | continue; | |
739 | } | |
740 | fp = &f->fn_next; | |
741 | } | |
742 | ||
743 | return found; | |
744 | } | |
745 | ||
746 | static int dn_fib_table_flush(struct dn_fib_table *tb) | |
747 | { | |
748 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
749 | struct dn_zone *dz; | |
750 | int found = 0; | |
751 | ||
752 | dn_fib_hash_zombies = 0; | |
753 | for(dz = table->dh_zone_list; dz; dz = dz->dz_next) { | |
754 | int i; | |
755 | int tmp = 0; | |
756 | for(i = dz->dz_divisor-1; i >= 0; i--) | |
757 | tmp += dn_flush_list(&dz->dz_hash[i], dz->dz_order, table); | |
758 | dz->dz_nent -= tmp; | |
759 | found += tmp; | |
760 | } | |
761 | ||
762 | return found; | |
763 | } | |
764 | ||
765 | static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct flowi *flp, struct dn_fib_res *res) | |
766 | { | |
429eb0fa | 767 | int err; |
1da177e4 LT |
768 | struct dn_zone *dz; |
769 | struct dn_hash *t = (struct dn_hash *)tb->data; | |
770 | ||
771 | read_lock(&dn_fib_tables_lock); | |
772 | for(dz = t->dh_zone_list; dz; dz = dz->dz_next) { | |
773 | struct dn_fib_node *f; | |
774 | dn_fib_key_t k = dz_key(flp->fld_dst, dz); | |
775 | ||
776 | for(f = dz_chain(k, dz); f; f = f->fn_next) { | |
777 | if (!dn_key_eq(k, f->fn_key)) { | |
778 | if (dn_key_leq(k, f->fn_key)) | |
779 | break; | |
780 | else | |
781 | continue; | |
782 | } | |
783 | ||
784 | f->fn_state |= DN_S_ACCESSED; | |
785 | ||
786 | if (f->fn_state&DN_S_ZOMBIE) | |
787 | continue; | |
788 | ||
789 | if (f->fn_scope < flp->fld_scope) | |
790 | continue; | |
791 | ||
792 | err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), flp, res); | |
793 | ||
794 | if (err == 0) { | |
795 | res->type = f->fn_type; | |
429eb0fa | 796 | res->scope = f->fn_scope; |
1da177e4 LT |
797 | res->prefixlen = dz->dz_order; |
798 | goto out; | |
799 | } | |
800 | if (err < 0) | |
801 | goto out; | |
802 | } | |
803 | } | |
804 | err = 1; | |
805 | out: | |
806 | read_unlock(&dn_fib_tables_lock); | |
429eb0fa | 807 | return err; |
1da177e4 LT |
808 | } |
809 | ||
810 | ||
2dfe55b4 | 811 | struct dn_fib_table *dn_fib_get_table(u32 n, int create) |
1da177e4 | 812 | { |
429eb0fa | 813 | struct dn_fib_table *t; |
abcab268 PM |
814 | struct hlist_node *node; |
815 | unsigned int h; | |
1da177e4 | 816 | |
429eb0fa YH |
817 | if (n < RT_TABLE_MIN) |
818 | return NULL; | |
1da177e4 | 819 | |
429eb0fa YH |
820 | if (n > RT_TABLE_MAX) |
821 | return NULL; | |
1da177e4 | 822 | |
abcab268 PM |
823 | h = n & (DN_FIB_TABLE_HASHSZ - 1); |
824 | rcu_read_lock(); | |
825 | hlist_for_each_entry_rcu(t, node, &dn_fib_table_hash[h], hlist) { | |
826 | if (t->n == n) { | |
827 | rcu_read_unlock(); | |
828 | return t; | |
829 | } | |
830 | } | |
831 | rcu_read_unlock(); | |
1da177e4 | 832 | |
429eb0fa YH |
833 | if (!create) |
834 | return NULL; | |
1da177e4 | 835 | |
429eb0fa YH |
836 | if (in_interrupt() && net_ratelimit()) { |
837 | printk(KERN_DEBUG "DECnet: BUG! Attempt to create routing table from interrupt\n"); | |
838 | return NULL; | |
839 | } | |
1da177e4 | 840 | |
429eb0fa | 841 | t = kzalloc(sizeof(struct dn_fib_table) + sizeof(struct dn_hash), |
e6b61105 | 842 | GFP_KERNEL); |
429eb0fa YH |
843 | if (t == NULL) |
844 | return NULL; | |
845 | ||
846 | t->n = n; | |
847 | t->insert = dn_fib_table_insert; | |
848 | t->delete = dn_fib_table_delete; | |
849 | t->lookup = dn_fib_table_lookup; | |
850 | t->flush = dn_fib_table_flush; | |
851 | t->dump = dn_fib_table_dump; | |
abcab268 | 852 | hlist_add_head_rcu(&t->hlist, &dn_fib_table_hash[h]); |
1da177e4 | 853 | |
429eb0fa | 854 | return t; |
1da177e4 LT |
855 | } |
856 | ||
1da177e4 LT |
857 | struct dn_fib_table *dn_fib_empty_table(void) |
858 | { | |
429eb0fa | 859 | u32 id; |
1da177e4 | 860 | |
429eb0fa | 861 | for(id = RT_TABLE_MIN; id <= RT_TABLE_MAX; id++) |
abcab268 | 862 | if (dn_fib_get_table(id, 0) == NULL) |
429eb0fa YH |
863 | return dn_fib_get_table(id, 1); |
864 | return NULL; | |
1da177e4 LT |
865 | } |
866 | ||
abcab268 PM |
867 | void dn_fib_flush(void) |
868 | { | |
429eb0fa YH |
869 | int flushed = 0; |
870 | struct dn_fib_table *tb; | |
abcab268 PM |
871 | struct hlist_node *node; |
872 | unsigned int h; | |
873 | ||
874 | for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) { | |
875 | hlist_for_each_entry(tb, node, &dn_fib_table_hash[h], hlist) | |
429eb0fa YH |
876 | flushed += tb->flush(tb); |
877 | } | |
abcab268 | 878 | |
429eb0fa YH |
879 | if (flushed) |
880 | dn_rt_cache_flush(-1); | |
abcab268 PM |
881 | } |
882 | ||
1da177e4 LT |
883 | void __init dn_fib_table_init(void) |
884 | { | |
885 | dn_hash_kmem = kmem_cache_create("dn_fib_info_cache", | |
886 | sizeof(struct dn_fib_info), | |
887 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 888 | NULL); |
1da177e4 LT |
889 | } |
890 | ||
891 | void __exit dn_fib_table_cleanup(void) | |
892 | { | |
abcab268 PM |
893 | struct dn_fib_table *t; |
894 | struct hlist_node *node, *next; | |
895 | unsigned int h; | |
1da177e4 | 896 | |
abcab268 PM |
897 | write_lock(&dn_fib_tables_lock); |
898 | for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) { | |
899 | hlist_for_each_entry_safe(t, node, next, &dn_fib_table_hash[h], | |
429eb0fa | 900 | hlist) { |
abcab268 PM |
901 | hlist_del(&t->hlist); |
902 | kfree(t); | |
903 | } | |
904 | } | |
905 | write_unlock(&dn_fib_tables_lock); | |
1da177e4 | 906 | } |