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> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 LT |
19 | #include <linux/sockios.h> |
20 | #include <linux/init.h> | |
21 | #include <linux/skbuff.h> | |
1da177e4 LT |
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> | |
60063497 | 27 | #include <linux/atomic.h> |
1da177e4 LT |
28 | #include <asm/uaccess.h> |
29 | #include <linux/route.h> /* RTF_xxx */ | |
30 | #include <net/neighbour.h> | |
dc5fc579 | 31 | #include <net/netlink.h> |
ea697639 | 32 | #include <net/tcp.h> |
1da177e4 LT |
33 | #include <net/dst.h> |
34 | #include <net/flow.h> | |
a8731cbf | 35 | #include <net/fib_rules.h> |
1da177e4 LT |
36 | #include <net/dn.h> |
37 | #include <net/dn_route.h> | |
38 | #include <net/dn_fib.h> | |
39 | #include <net/dn_neigh.h> | |
40 | #include <net/dn_dev.h> | |
41 | ||
42 | struct dn_zone | |
43 | { | |
44 | struct dn_zone *dz_next; | |
45 | struct dn_fib_node **dz_hash; | |
46 | int dz_nent; | |
47 | int dz_divisor; | |
48 | u32 dz_hashmask; | |
49 | #define DZ_HASHMASK(dz) ((dz)->dz_hashmask) | |
50 | int dz_order; | |
c4ea94ab | 51 | __le16 dz_mask; |
1da177e4 LT |
52 | #define DZ_MASK(dz) ((dz)->dz_mask) |
53 | }; | |
54 | ||
55 | struct dn_hash | |
56 | { | |
57 | struct dn_zone *dh_zones[17]; | |
58 | struct dn_zone *dh_zone_list; | |
59 | }; | |
60 | ||
61 | #define dz_key_0(key) ((key).datum = 0) | |
1da177e4 LT |
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 | { | |
a01c1335 | 126 | struct dn_fib_node *f, **fp, *next; |
1da177e4 | 127 | int i; |
1da177e4 LT |
128 | |
129 | for(i = 0; i < old_divisor; i++) { | |
a01c1335 DM |
130 | for(f = old_ht[i]; f; f = next) { |
131 | next = f->fn_next; | |
1da177e4 LT |
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 | ||
06f8fe11 JP |
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", | |
157 | old_divisor); | |
158 | case 256: | |
159 | new_divisor = 1024; | |
160 | new_hashmask = 0x3FF; | |
161 | break; | |
1da177e4 LT |
162 | } |
163 | ||
0da974f4 | 164 | ht = kcalloc(new_divisor, sizeof(struct dn_fib_node*), GFP_KERNEL); |
1da177e4 LT |
165 | if (ht == NULL) |
166 | return; | |
167 | ||
1da177e4 LT |
168 | write_lock_bh(&dn_fib_tables_lock); |
169 | old_ht = dz->dz_hash; | |
170 | dz->dz_hash = ht; | |
171 | dz->dz_hashmask = new_hashmask; | |
172 | dz->dz_divisor = new_divisor; | |
173 | dn_rebuild_zone(dz, old_ht, old_divisor); | |
174 | write_unlock_bh(&dn_fib_tables_lock); | |
175 | kfree(old_ht); | |
176 | } | |
177 | ||
178 | static void dn_free_node(struct dn_fib_node *f) | |
179 | { | |
180 | dn_fib_release_info(DN_FIB_INFO(f)); | |
181 | kmem_cache_free(dn_hash_kmem, f); | |
182 | } | |
183 | ||
184 | ||
185 | static struct dn_zone *dn_new_zone(struct dn_hash *table, int z) | |
186 | { | |
187 | int i; | |
0da974f4 | 188 | struct dn_zone *dz = kzalloc(sizeof(struct dn_zone), GFP_KERNEL); |
1da177e4 LT |
189 | if (!dz) |
190 | return NULL; | |
191 | ||
1da177e4 LT |
192 | if (z) { |
193 | dz->dz_divisor = 16; | |
194 | dz->dz_hashmask = 0x0F; | |
195 | } else { | |
196 | dz->dz_divisor = 1; | |
197 | dz->dz_hashmask = 0; | |
198 | } | |
199 | ||
0da974f4 | 200 | dz->dz_hash = kcalloc(dz->dz_divisor, sizeof(struct dn_fib_node *), GFP_KERNEL); |
1da177e4 LT |
201 | if (!dz->dz_hash) { |
202 | kfree(dz); | |
203 | return NULL; | |
204 | } | |
205 | ||
1da177e4 LT |
206 | dz->dz_order = z; |
207 | dz->dz_mask = dnet_make_mask(z); | |
208 | ||
209 | for(i = z + 1; i <= 16; i++) | |
210 | if (table->dh_zones[i]) | |
211 | break; | |
212 | ||
213 | write_lock_bh(&dn_fib_tables_lock); | |
214 | if (i>16) { | |
215 | dz->dz_next = table->dh_zone_list; | |
216 | table->dh_zone_list = dz; | |
217 | } else { | |
218 | dz->dz_next = table->dh_zones[i]->dz_next; | |
219 | table->dh_zones[i]->dz_next = dz; | |
220 | } | |
221 | table->dh_zones[z] = dz; | |
222 | write_unlock_bh(&dn_fib_tables_lock); | |
223 | return dz; | |
224 | } | |
225 | ||
226 | ||
58d7d8f9 | 227 | static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct nlattr *attrs[], struct dn_fib_info *fi) |
1da177e4 LT |
228 | { |
229 | struct rtnexthop *nhp; | |
230 | int nhlen; | |
231 | ||
58d7d8f9 TG |
232 | if (attrs[RTA_PRIORITY] && |
233 | nla_get_u32(attrs[RTA_PRIORITY]) != fi->fib_priority) | |
1da177e4 LT |
234 | return 1; |
235 | ||
58d7d8f9 TG |
236 | if (attrs[RTA_OIF] || attrs[RTA_GATEWAY]) { |
237 | if ((!attrs[RTA_OIF] || nla_get_u32(attrs[RTA_OIF]) == fi->fib_nh->nh_oif) && | |
238 | (!attrs[RTA_GATEWAY] || nla_get_le16(attrs[RTA_GATEWAY]) != fi->fib_nh->nh_gw)) | |
1da177e4 LT |
239 | return 0; |
240 | return 1; | |
241 | } | |
242 | ||
58d7d8f9 | 243 | if (!attrs[RTA_MULTIPATH]) |
1da177e4 LT |
244 | return 0; |
245 | ||
58d7d8f9 TG |
246 | nhp = nla_data(attrs[RTA_MULTIPATH]); |
247 | nhlen = nla_len(attrs[RTA_MULTIPATH]); | |
1da177e4 LT |
248 | |
249 | for_nexthops(fi) { | |
250 | int attrlen = nhlen - sizeof(struct rtnexthop); | |
c4ea94ab | 251 | __le16 gw; |
1da177e4 LT |
252 | |
253 | if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0) | |
254 | return -EINVAL; | |
255 | if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif) | |
256 | return 1; | |
257 | if (attrlen) { | |
58d7d8f9 TG |
258 | struct nlattr *gw_attr; |
259 | ||
260 | gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY); | |
261 | gw = gw_attr ? nla_get_le16(gw_attr) : 0; | |
1da177e4 LT |
262 | |
263 | if (gw && gw != nh->nh_gw) | |
264 | return 1; | |
265 | } | |
266 | nhp = RTNH_NEXT(nhp); | |
267 | } endfor_nexthops(fi); | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
339bf98f TG |
272 | static inline size_t dn_fib_nlmsg_size(struct dn_fib_info *fi) |
273 | { | |
75356f27 | 274 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) |
339bf98f TG |
275 | + nla_total_size(4) /* RTA_TABLE */ |
276 | + nla_total_size(2) /* RTA_DST */ | |
ea697639 DB |
277 | + nla_total_size(4) /* RTA_PRIORITY */ |
278 | + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */ | |
339bf98f TG |
279 | |
280 | /* space for nested metrics */ | |
281 | payload += nla_total_size((RTAX_MAX * nla_total_size(4))); | |
282 | ||
283 | if (fi->fib_nhs) { | |
284 | /* Also handles the special case fib_nhs == 1 */ | |
285 | ||
286 | /* each nexthop is packed in an attribute */ | |
287 | size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); | |
288 | ||
289 | /* may contain a gateway attribute */ | |
290 | nhsize += nla_total_size(4); | |
291 | ||
292 | /* all nexthops are packed in a nested attribute */ | |
293 | payload += nla_total_size(fi->fib_nhs * nhsize); | |
294 | } | |
295 | ||
296 | return payload; | |
297 | } | |
298 | ||
15e47304 | 299 | static int dn_fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, |
429eb0fa YH |
300 | u32 tb_id, u8 type, u8 scope, void *dst, int dst_len, |
301 | struct dn_fib_info *fi, unsigned int flags) | |
1da177e4 | 302 | { |
429eb0fa YH |
303 | struct rtmsg *rtm; |
304 | struct nlmsghdr *nlh; | |
429eb0fa | 305 | |
15e47304 | 306 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); |
3f7a3283 | 307 | if (!nlh) |
6b60978f TG |
308 | return -EMSGSIZE; |
309 | ||
3f7a3283 | 310 | rtm = nlmsg_data(nlh); |
429eb0fa YH |
311 | rtm->rtm_family = AF_DECnet; |
312 | rtm->rtm_dst_len = dst_len; | |
313 | rtm->rtm_src_len = 0; | |
314 | rtm->rtm_tos = 0; | |
315 | rtm->rtm_table = tb_id; | |
429eb0fa YH |
316 | rtm->rtm_flags = fi->fib_flags; |
317 | rtm->rtm_scope = scope; | |
1da177e4 | 318 | rtm->rtm_type = type; |
429eb0fa | 319 | rtm->rtm_protocol = fi->fib_protocol; |
6b60978f TG |
320 | |
321 | if (nla_put_u32(skb, RTA_TABLE, tb_id) < 0) | |
322 | goto errout; | |
323 | ||
324 | if (rtm->rtm_dst_len && | |
325 | nla_put(skb, RTA_DST, 2, dst) < 0) | |
326 | goto errout; | |
327 | ||
328 | if (fi->fib_priority && | |
329 | nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority) < 0) | |
330 | goto errout; | |
331 | ||
1da177e4 | 332 | if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0) |
6b60978f TG |
333 | goto errout; |
334 | ||
429eb0fa | 335 | if (fi->fib_nhs == 1) { |
6b60978f TG |
336 | if (fi->fib_nh->nh_gw && |
337 | nla_put_le16(skb, RTA_GATEWAY, fi->fib_nh->nh_gw) < 0) | |
338 | goto errout; | |
339 | ||
340 | if (fi->fib_nh->nh_oif && | |
341 | nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif) < 0) | |
342 | goto errout; | |
429eb0fa | 343 | } |
6b60978f | 344 | |
429eb0fa YH |
345 | if (fi->fib_nhs > 1) { |
346 | struct rtnexthop *nhp; | |
6b60978f TG |
347 | struct nlattr *mp_head; |
348 | ||
349 | if (!(mp_head = nla_nest_start(skb, RTA_MULTIPATH))) | |
350 | goto errout; | |
429eb0fa YH |
351 | |
352 | for_nexthops(fi) { | |
6b60978f TG |
353 | if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) |
354 | goto errout; | |
355 | ||
429eb0fa YH |
356 | nhp->rtnh_flags = nh->nh_flags & 0xFF; |
357 | nhp->rtnh_hops = nh->nh_weight - 1; | |
358 | nhp->rtnh_ifindex = nh->nh_oif; | |
6b60978f TG |
359 | |
360 | if (nh->nh_gw && | |
361 | nla_put_le16(skb, RTA_GATEWAY, nh->nh_gw) < 0) | |
362 | goto errout; | |
363 | ||
27a884dc | 364 | nhp->rtnh_len = skb_tail_pointer(skb) - (unsigned char *)nhp; |
429eb0fa | 365 | } endfor_nexthops(fi); |
6b60978f TG |
366 | |
367 | nla_nest_end(skb, mp_head); | |
429eb0fa YH |
368 | } |
369 | ||
6b60978f | 370 | return nlmsg_end(skb, nlh); |
1da177e4 | 371 | |
6b60978f TG |
372 | errout: |
373 | nlmsg_cancel(skb, nlh); | |
429eb0fa | 374 | return -EMSGSIZE; |
1da177e4 LT |
375 | } |
376 | ||
377 | ||
2dfe55b4 | 378 | static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, u32 tb_id, |
429eb0fa | 379 | struct nlmsghdr *nlh, struct netlink_skb_parms *req) |
1da177e4 | 380 | { |
429eb0fa | 381 | struct sk_buff *skb; |
15e47304 | 382 | u32 portid = req ? req->portid : 0; |
dc738dd8 | 383 | int err = -ENOBUFS; |
1da177e4 | 384 | |
429eb0fa YH |
385 | skb = nlmsg_new(dn_fib_nlmsg_size(DN_FIB_INFO(f)), GFP_KERNEL); |
386 | if (skb == NULL) | |
dc738dd8 | 387 | goto errout; |
1da177e4 | 388 | |
15e47304 | 389 | err = dn_fib_dump_info(skb, portid, nlh->nlmsg_seq, event, tb_id, |
dc738dd8 TG |
390 | f->fn_type, f->fn_scope, &f->fn_key, z, |
391 | DN_FIB_INFO(f), 0); | |
26932566 PM |
392 | if (err < 0) { |
393 | /* -EMSGSIZE implies BUG in dn_fib_nlmsg_size() */ | |
394 | WARN_ON(err == -EMSGSIZE); | |
395 | kfree_skb(skb); | |
396 | goto errout; | |
397 | } | |
15e47304 | 398 | rtnl_notify(skb, &init_net, portid, RTNLGRP_DECnet_ROUTE, nlh, GFP_KERNEL); |
1ce85fe4 | 399 | return; |
dc738dd8 TG |
400 | errout: |
401 | if (err < 0) | |
97c53cac | 402 | rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_ROUTE, err); |
1da177e4 LT |
403 | } |
404 | ||
429eb0fa | 405 | static __inline__ int dn_hash_dump_bucket(struct sk_buff *skb, |
1da177e4 LT |
406 | struct netlink_callback *cb, |
407 | struct dn_fib_table *tb, | |
408 | struct dn_zone *dz, | |
409 | struct dn_fib_node *f) | |
410 | { | |
411 | int i, s_i; | |
412 | ||
abcab268 | 413 | s_i = cb->args[4]; |
1da177e4 LT |
414 | for(i = 0; f; i++, f = f->fn_next) { |
415 | if (i < s_i) | |
416 | continue; | |
417 | if (f->fn_state & DN_S_ZOMBIE) | |
418 | continue; | |
15e47304 | 419 | if (dn_fib_dump_info(skb, NETLINK_CB(cb->skb).portid, |
1da177e4 LT |
420 | cb->nlh->nlmsg_seq, |
421 | RTM_NEWROUTE, | |
429eb0fa | 422 | tb->n, |
1da177e4 | 423 | (f->fn_state & DN_S_ZOMBIE) ? 0 : f->fn_type, |
429eb0fa | 424 | f->fn_scope, &f->fn_key, dz->dz_order, |
b6544c0b | 425 | f->fn_info, NLM_F_MULTI) < 0) { |
abcab268 | 426 | cb->args[4] = i; |
1da177e4 LT |
427 | return -1; |
428 | } | |
429 | } | |
abcab268 | 430 | cb->args[4] = i; |
1da177e4 LT |
431 | return skb->len; |
432 | } | |
433 | ||
429eb0fa | 434 | static __inline__ int dn_hash_dump_zone(struct sk_buff *skb, |
1da177e4 LT |
435 | struct netlink_callback *cb, |
436 | struct dn_fib_table *tb, | |
437 | struct dn_zone *dz) | |
438 | { | |
439 | int h, s_h; | |
440 | ||
abcab268 | 441 | s_h = cb->args[3]; |
1da177e4 LT |
442 | for(h = 0; h < dz->dz_divisor; h++) { |
443 | if (h < s_h) | |
444 | continue; | |
445 | if (h > s_h) | |
abcab268 | 446 | memset(&cb->args[4], 0, sizeof(cb->args) - 4*sizeof(cb->args[0])); |
1da177e4 LT |
447 | if (dz->dz_hash == NULL || dz->dz_hash[h] == NULL) |
448 | continue; | |
449 | if (dn_hash_dump_bucket(skb, cb, tb, dz, dz->dz_hash[h]) < 0) { | |
abcab268 | 450 | cb->args[3] = h; |
1da177e4 LT |
451 | return -1; |
452 | } | |
453 | } | |
abcab268 | 454 | cb->args[3] = h; |
1da177e4 LT |
455 | return skb->len; |
456 | } | |
457 | ||
429eb0fa YH |
458 | static int dn_fib_table_dump(struct dn_fib_table *tb, struct sk_buff *skb, |
459 | struct netlink_callback *cb) | |
1da177e4 | 460 | { |
429eb0fa | 461 | int m, s_m; |
1da177e4 LT |
462 | struct dn_zone *dz; |
463 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
464 | ||
abcab268 | 465 | s_m = cb->args[2]; |
1da177e4 LT |
466 | read_lock(&dn_fib_tables_lock); |
467 | for(dz = table->dh_zone_list, m = 0; dz; dz = dz->dz_next, m++) { | |
468 | if (m < s_m) | |
469 | continue; | |
470 | if (m > s_m) | |
abcab268 | 471 | memset(&cb->args[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0])); |
1da177e4 LT |
472 | |
473 | if (dn_hash_dump_zone(skb, cb, tb, dz) < 0) { | |
abcab268 | 474 | cb->args[2] = m; |
1da177e4 LT |
475 | read_unlock(&dn_fib_tables_lock); |
476 | return -1; | |
477 | } | |
478 | } | |
479 | read_unlock(&dn_fib_tables_lock); | |
abcab268 | 480 | cb->args[2] = m; |
1da177e4 | 481 | |
429eb0fa | 482 | return skb->len; |
1da177e4 LT |
483 | } |
484 | ||
abcab268 PM |
485 | int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb) |
486 | { | |
3b1e0a65 | 487 | struct net *net = sock_net(skb->sk); |
abcab268 PM |
488 | unsigned int h, s_h; |
489 | unsigned int e = 0, s_e; | |
490 | struct dn_fib_table *tb; | |
abcab268 PM |
491 | int dumped = 0; |
492 | ||
09ad9bc7 | 493 | if (!net_eq(net, &init_net)) |
b854272b DL |
494 | return 0; |
495 | ||
573ce260 | 496 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
3f7a3283 | 497 | ((struct rtmsg *)nlmsg_data(cb->nlh))->rtm_flags&RTM_F_CLONED) |
abcab268 PM |
498 | return dn_cache_dump(skb, cb); |
499 | ||
500 | s_h = cb->args[0]; | |
501 | s_e = cb->args[1]; | |
502 | ||
503 | for (h = s_h; h < DN_FIB_TABLE_HASHSZ; h++, s_h = 0) { | |
504 | e = 0; | |
b67bfe0d | 505 | hlist_for_each_entry(tb, &dn_fib_table_hash[h], hlist) { |
abcab268 PM |
506 | if (e < s_e) |
507 | goto next; | |
508 | if (dumped) | |
509 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
429eb0fa | 510 | 2 * sizeof(cb->args[0])); |
abcab268 PM |
511 | if (tb->dump(tb, skb, cb) < 0) |
512 | goto out; | |
513 | dumped = 1; | |
514 | next: | |
515 | e++; | |
516 | } | |
517 | } | |
518 | out: | |
519 | cb->args[1] = e; | |
520 | cb->args[0] = h; | |
521 | ||
522 | return skb->len; | |
523 | } | |
524 | ||
58d7d8f9 TG |
525 | static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct nlattr *attrs[], |
526 | struct nlmsghdr *n, struct netlink_skb_parms *req) | |
1da177e4 LT |
527 | { |
528 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
529 | struct dn_fib_node *new_f, *f, **fp, **del_fp; | |
530 | struct dn_zone *dz; | |
531 | struct dn_fib_info *fi; | |
429eb0fa | 532 | int z = r->rtm_dst_len; |
1da177e4 LT |
533 | int type = r->rtm_type; |
534 | dn_fib_key_t key; | |
429eb0fa | 535 | int err; |
1da177e4 | 536 | |
429eb0fa YH |
537 | if (z > 16) |
538 | return -EINVAL; | |
1da177e4 LT |
539 | |
540 | dz = table->dh_zones[z]; | |
541 | if (!dz && !(dz = dn_new_zone(table, z))) | |
542 | return -ENOBUFS; | |
543 | ||
544 | dz_key_0(key); | |
58d7d8f9 TG |
545 | if (attrs[RTA_DST]) { |
546 | __le16 dst = nla_get_le16(attrs[RTA_DST]); | |
1da177e4 LT |
547 | if (dst & ~DZ_MASK(dz)) |
548 | return -EINVAL; | |
549 | key = dz_key(dst, dz); | |
550 | } | |
551 | ||
58d7d8f9 | 552 | if ((fi = dn_fib_create_info(r, attrs, n, &err)) == NULL) |
429eb0fa | 553 | return err; |
1da177e4 LT |
554 | |
555 | if (dz->dz_nent > (dz->dz_divisor << 2) && | |
556 | dz->dz_divisor > DN_MAX_DIVISOR && | |
557 | (z==16 || (1<<z) > dz->dz_divisor)) | |
558 | dn_rehash_zone(dz); | |
559 | ||
560 | fp = dn_chain_p(key, dz); | |
561 | ||
562 | DN_FIB_SCAN(f, fp) { | |
563 | if (dn_key_leq(key, f->fn_key)) | |
564 | break; | |
565 | } | |
566 | ||
567 | del_fp = NULL; | |
568 | ||
569 | if (f && (f->fn_state & DN_S_ZOMBIE) && | |
570 | dn_key_eq(f->fn_key, key)) { | |
571 | del_fp = fp; | |
572 | fp = &f->fn_next; | |
573 | f = *fp; | |
574 | goto create; | |
575 | } | |
576 | ||
577 | DN_FIB_SCAN_KEY(f, fp, key) { | |
578 | if (fi->fib_priority <= DN_FIB_INFO(f)->fib_priority) | |
579 | break; | |
580 | } | |
581 | ||
582 | if (f && dn_key_eq(f->fn_key, key) && | |
583 | fi->fib_priority == DN_FIB_INFO(f)->fib_priority) { | |
584 | struct dn_fib_node **ins_fp; | |
585 | ||
586 | err = -EEXIST; | |
587 | if (n->nlmsg_flags & NLM_F_EXCL) | |
588 | goto out; | |
589 | ||
590 | if (n->nlmsg_flags & NLM_F_REPLACE) { | |
591 | del_fp = fp; | |
592 | fp = &f->fn_next; | |
593 | f = *fp; | |
594 | goto replace; | |
595 | } | |
596 | ||
597 | ins_fp = fp; | |
598 | err = -EEXIST; | |
599 | ||
600 | DN_FIB_SCAN_KEY(f, fp, key) { | |
601 | if (fi->fib_priority != DN_FIB_INFO(f)->fib_priority) | |
602 | break; | |
f64f9e71 JP |
603 | if (f->fn_type == type && |
604 | f->fn_scope == r->rtm_scope && | |
605 | DN_FIB_INFO(f) == fi) | |
1da177e4 LT |
606 | goto out; |
607 | } | |
608 | ||
609 | if (!(n->nlmsg_flags & NLM_F_APPEND)) { | |
610 | fp = ins_fp; | |
611 | f = *fp; | |
612 | } | |
613 | } | |
614 | ||
615 | create: | |
616 | err = -ENOENT; | |
617 | if (!(n->nlmsg_flags & NLM_F_CREATE)) | |
618 | goto out; | |
619 | ||
620 | replace: | |
621 | err = -ENOBUFS; | |
c3762229 | 622 | new_f = kmem_cache_zalloc(dn_hash_kmem, GFP_KERNEL); |
1da177e4 LT |
623 | if (new_f == NULL) |
624 | goto out; | |
625 | ||
1da177e4 LT |
626 | new_f->fn_key = key; |
627 | new_f->fn_type = type; | |
628 | new_f->fn_scope = r->rtm_scope; | |
629 | DN_FIB_INFO(new_f) = fi; | |
630 | ||
631 | new_f->fn_next = f; | |
632 | write_lock_bh(&dn_fib_tables_lock); | |
633 | *fp = new_f; | |
634 | write_unlock_bh(&dn_fib_tables_lock); | |
635 | dz->dz_nent++; | |
636 | ||
637 | if (del_fp) { | |
638 | f = *del_fp; | |
639 | write_lock_bh(&dn_fib_tables_lock); | |
640 | *del_fp = f->fn_next; | |
641 | write_unlock_bh(&dn_fib_tables_lock); | |
642 | ||
643 | if (!(f->fn_state & DN_S_ZOMBIE)) | |
644 | dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req); | |
645 | if (f->fn_state & DN_S_ACCESSED) | |
646 | dn_rt_cache_flush(-1); | |
647 | dn_free_node(f); | |
648 | dz->dz_nent--; | |
649 | } else { | |
650 | dn_rt_cache_flush(-1); | |
651 | } | |
652 | ||
429eb0fa | 653 | dn_rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->n, n, req); |
1da177e4 | 654 | |
429eb0fa | 655 | return 0; |
1da177e4 LT |
656 | out: |
657 | dn_fib_release_info(fi); | |
658 | return err; | |
659 | } | |
660 | ||
661 | ||
58d7d8f9 TG |
662 | static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct nlattr *attrs[], |
663 | struct nlmsghdr *n, struct netlink_skb_parms *req) | |
1da177e4 LT |
664 | { |
665 | struct dn_hash *table = (struct dn_hash*)tb->data; | |
666 | struct dn_fib_node **fp, **del_fp, *f; | |
429eb0fa | 667 | int z = r->rtm_dst_len; |
1da177e4 LT |
668 | struct dn_zone *dz; |
669 | dn_fib_key_t key; | |
670 | int matched; | |
671 | ||
672 | ||
429eb0fa YH |
673 | if (z > 16) |
674 | return -EINVAL; | |
1da177e4 LT |
675 | |
676 | if ((dz = table->dh_zones[z]) == NULL) | |
677 | return -ESRCH; | |
678 | ||
679 | dz_key_0(key); | |
58d7d8f9 TG |
680 | if (attrs[RTA_DST]) { |
681 | __le16 dst = nla_get_le16(attrs[RTA_DST]); | |
1da177e4 LT |
682 | if (dst & ~DZ_MASK(dz)) |
683 | return -EINVAL; | |
684 | key = dz_key(dst, dz); | |
685 | } | |
686 | ||
687 | fp = dn_chain_p(key, dz); | |
688 | ||
689 | DN_FIB_SCAN(f, fp) { | |
690 | if (dn_key_eq(f->fn_key, key)) | |
691 | break; | |
692 | if (dn_key_leq(key, f->fn_key)) | |
693 | return -ESRCH; | |
694 | } | |
695 | ||
696 | matched = 0; | |
697 | del_fp = NULL; | |
698 | DN_FIB_SCAN_KEY(f, fp, key) { | |
699 | struct dn_fib_info *fi = DN_FIB_INFO(f); | |
700 | ||
701 | if (f->fn_state & DN_S_ZOMBIE) | |
702 | return -ESRCH; | |
703 | ||
704 | matched++; | |
705 | ||
706 | if (del_fp == NULL && | |
707 | (!r->rtm_type || f->fn_type == r->rtm_type) && | |
708 | (r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) && | |
429eb0fa | 709 | (!r->rtm_protocol || |
1da177e4 | 710 | fi->fib_protocol == r->rtm_protocol) && |
58d7d8f9 | 711 | dn_fib_nh_match(r, n, attrs, fi) == 0) |
1da177e4 LT |
712 | del_fp = fp; |
713 | } | |
714 | ||
715 | if (del_fp) { | |
716 | f = *del_fp; | |
429eb0fa | 717 | dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req); |
1da177e4 LT |
718 | |
719 | if (matched != 1) { | |
720 | write_lock_bh(&dn_fib_tables_lock); | |
721 | *del_fp = f->fn_next; | |
722 | write_unlock_bh(&dn_fib_tables_lock); | |
723 | ||
724 | if (f->fn_state & DN_S_ACCESSED) | |
725 | dn_rt_cache_flush(-1); | |
726 | dn_free_node(f); | |
727 | dz->dz_nent--; | |
728 | } else { | |
729 | f->fn_state |= DN_S_ZOMBIE; | |
730 | if (f->fn_state & DN_S_ACCESSED) { | |
731 | f->fn_state &= ~DN_S_ACCESSED; | |
732 | dn_rt_cache_flush(-1); | |
733 | } | |
734 | if (++dn_fib_hash_zombies > 128) | |
735 | dn_fib_flush(); | |
736 | } | |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
429eb0fa | 741 | return -ESRCH; |
1da177e4 LT |
742 | } |
743 | ||
744 | static inline int dn_flush_list(struct dn_fib_node **fp, int z, struct dn_hash *table) | |
745 | { | |
746 | int found = 0; | |
747 | struct dn_fib_node *f; | |
748 | ||
749 | while((f = *fp) != NULL) { | |
750 | struct dn_fib_info *fi = DN_FIB_INFO(f); | |
751 | ||
752 | if (fi && ((f->fn_state & DN_S_ZOMBIE) || (fi->fib_flags & RTNH_F_DEAD))) { | |
753 | write_lock_bh(&dn_fib_tables_lock); | |
754 | *fp = f->fn_next; | |
755 | write_unlock_bh(&dn_fib_tables_lock); | |
756 | ||
757 | dn_free_node(f); | |
758 | found++; | |
759 | continue; | |
760 | } | |
761 | fp = &f->fn_next; | |
762 | } | |
763 | ||
764 | return found; | |
765 | } | |
766 | ||
767 | static int dn_fib_table_flush(struct dn_fib_table *tb) | |
768 | { | |
769 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
770 | struct dn_zone *dz; | |
771 | int found = 0; | |
772 | ||
773 | dn_fib_hash_zombies = 0; | |
774 | for(dz = table->dh_zone_list; dz; dz = dz->dz_next) { | |
775 | int i; | |
776 | int tmp = 0; | |
777 | for(i = dz->dz_divisor-1; i >= 0; i--) | |
778 | tmp += dn_flush_list(&dz->dz_hash[i], dz->dz_order, table); | |
779 | dz->dz_nent -= tmp; | |
780 | found += tmp; | |
781 | } | |
782 | ||
783 | return found; | |
784 | } | |
785 | ||
bef55aeb | 786 | static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct flowidn *flp, struct dn_fib_res *res) |
1da177e4 | 787 | { |
429eb0fa | 788 | int err; |
1da177e4 LT |
789 | struct dn_zone *dz; |
790 | struct dn_hash *t = (struct dn_hash *)tb->data; | |
791 | ||
792 | read_lock(&dn_fib_tables_lock); | |
793 | for(dz = t->dh_zone_list; dz; dz = dz->dz_next) { | |
794 | struct dn_fib_node *f; | |
bef55aeb | 795 | dn_fib_key_t k = dz_key(flp->daddr, dz); |
1da177e4 LT |
796 | |
797 | for(f = dz_chain(k, dz); f; f = f->fn_next) { | |
798 | if (!dn_key_eq(k, f->fn_key)) { | |
799 | if (dn_key_leq(k, f->fn_key)) | |
800 | break; | |
801 | else | |
802 | continue; | |
803 | } | |
804 | ||
805 | f->fn_state |= DN_S_ACCESSED; | |
806 | ||
807 | if (f->fn_state&DN_S_ZOMBIE) | |
808 | continue; | |
809 | ||
bef55aeb | 810 | if (f->fn_scope < flp->flowidn_scope) |
1da177e4 LT |
811 | continue; |
812 | ||
813 | err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), flp, res); | |
814 | ||
815 | if (err == 0) { | |
816 | res->type = f->fn_type; | |
429eb0fa | 817 | res->scope = f->fn_scope; |
1da177e4 LT |
818 | res->prefixlen = dz->dz_order; |
819 | goto out; | |
820 | } | |
821 | if (err < 0) | |
822 | goto out; | |
823 | } | |
824 | } | |
825 | err = 1; | |
826 | out: | |
827 | read_unlock(&dn_fib_tables_lock); | |
429eb0fa | 828 | return err; |
1da177e4 LT |
829 | } |
830 | ||
831 | ||
2dfe55b4 | 832 | struct dn_fib_table *dn_fib_get_table(u32 n, int create) |
1da177e4 | 833 | { |
429eb0fa | 834 | struct dn_fib_table *t; |
abcab268 | 835 | unsigned int h; |
1da177e4 | 836 | |
429eb0fa YH |
837 | if (n < RT_TABLE_MIN) |
838 | return NULL; | |
1da177e4 | 839 | |
429eb0fa YH |
840 | if (n > RT_TABLE_MAX) |
841 | return NULL; | |
1da177e4 | 842 | |
abcab268 PM |
843 | h = n & (DN_FIB_TABLE_HASHSZ - 1); |
844 | rcu_read_lock(); | |
b67bfe0d | 845 | hlist_for_each_entry_rcu(t, &dn_fib_table_hash[h], hlist) { |
abcab268 PM |
846 | if (t->n == n) { |
847 | rcu_read_unlock(); | |
848 | return t; | |
849 | } | |
850 | } | |
851 | rcu_read_unlock(); | |
1da177e4 | 852 | |
429eb0fa YH |
853 | if (!create) |
854 | return NULL; | |
1da177e4 | 855 | |
e87cc472 JP |
856 | if (in_interrupt()) { |
857 | net_dbg_ratelimited("DECnet: BUG! Attempt to create routing table from interrupt\n"); | |
429eb0fa YH |
858 | return NULL; |
859 | } | |
1da177e4 | 860 | |
429eb0fa | 861 | t = kzalloc(sizeof(struct dn_fib_table) + sizeof(struct dn_hash), |
e6b61105 | 862 | GFP_KERNEL); |
429eb0fa YH |
863 | if (t == NULL) |
864 | return NULL; | |
865 | ||
866 | t->n = n; | |
867 | t->insert = dn_fib_table_insert; | |
868 | t->delete = dn_fib_table_delete; | |
869 | t->lookup = dn_fib_table_lookup; | |
870 | t->flush = dn_fib_table_flush; | |
871 | t->dump = dn_fib_table_dump; | |
abcab268 | 872 | hlist_add_head_rcu(&t->hlist, &dn_fib_table_hash[h]); |
1da177e4 | 873 | |
429eb0fa | 874 | return t; |
1da177e4 LT |
875 | } |
876 | ||
1da177e4 LT |
877 | struct dn_fib_table *dn_fib_empty_table(void) |
878 | { | |
429eb0fa | 879 | u32 id; |
1da177e4 | 880 | |
429eb0fa | 881 | for(id = RT_TABLE_MIN; id <= RT_TABLE_MAX; id++) |
abcab268 | 882 | if (dn_fib_get_table(id, 0) == NULL) |
429eb0fa YH |
883 | return dn_fib_get_table(id, 1); |
884 | return NULL; | |
1da177e4 LT |
885 | } |
886 | ||
abcab268 PM |
887 | void dn_fib_flush(void) |
888 | { | |
429eb0fa YH |
889 | int flushed = 0; |
890 | struct dn_fib_table *tb; | |
abcab268 PM |
891 | unsigned int h; |
892 | ||
893 | for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) { | |
b67bfe0d | 894 | hlist_for_each_entry(tb, &dn_fib_table_hash[h], hlist) |
429eb0fa YH |
895 | flushed += tb->flush(tb); |
896 | } | |
abcab268 | 897 | |
429eb0fa YH |
898 | if (flushed) |
899 | dn_rt_cache_flush(-1); | |
abcab268 PM |
900 | } |
901 | ||
1da177e4 LT |
902 | void __init dn_fib_table_init(void) |
903 | { | |
904 | dn_hash_kmem = kmem_cache_create("dn_fib_info_cache", | |
905 | sizeof(struct dn_fib_info), | |
906 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 907 | NULL); |
1da177e4 LT |
908 | } |
909 | ||
910 | void __exit dn_fib_table_cleanup(void) | |
911 | { | |
abcab268 | 912 | struct dn_fib_table *t; |
b67bfe0d | 913 | struct hlist_node *next; |
abcab268 | 914 | unsigned int h; |
1da177e4 | 915 | |
abcab268 PM |
916 | write_lock(&dn_fib_tables_lock); |
917 | for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) { | |
b67bfe0d | 918 | hlist_for_each_entry_safe(t, next, &dn_fib_table_hash[h], |
429eb0fa | 919 | hlist) { |
abcab268 PM |
920 | hlist_del(&t->hlist); |
921 | kfree(t); | |
922 | } | |
923 | } | |
924 | write_unlock(&dn_fib_tables_lock); | |
1da177e4 | 925 | } |