Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * DECnet An implementation of the DECnet protocol suite for the LINUX | |
4 | * operating system. DECnet is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * DECnet Routing Forwarding Information Base (Routing Tables) | |
8 | * | |
9 | * Author: Steve Whitehouse <SteveW@ACM.org> | |
10 | * Mostly copied from the IPv4 routing code | |
11 | * | |
12 | * | |
13 | * Changes: | |
14 | * | |
15 | */ | |
1da177e4 LT |
16 | #include <linux/string.h> |
17 | #include <linux/net.h> | |
18 | #include <linux/socket.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <linux/sockios.h> |
21 | #include <linux/init.h> | |
22 | #include <linux/skbuff.h> | |
1da177e4 LT |
23 | #include <linux/rtnetlink.h> |
24 | #include <linux/proc_fs.h> | |
25 | #include <linux/netdevice.h> | |
26 | #include <linux/timer.h> | |
27 | #include <linux/spinlock.h> | |
60063497 | 28 | #include <linux/atomic.h> |
7c0f6ba6 | 29 | #include <linux/uaccess.h> |
1da177e4 LT |
30 | #include <linux/route.h> /* RTF_xxx */ |
31 | #include <net/neighbour.h> | |
dc5fc579 | 32 | #include <net/netlink.h> |
ea697639 | 33 | #include <net/tcp.h> |
1da177e4 LT |
34 | #include <net/dst.h> |
35 | #include <net/flow.h> | |
a8731cbf | 36 | #include <net/fib_rules.h> |
1da177e4 LT |
37 | #include <net/dn.h> |
38 | #include <net/dn_route.h> | |
39 | #include <net/dn_fib.h> | |
40 | #include <net/dn_neigh.h> | |
41 | #include <net/dn_dev.h> | |
42 | ||
43 | struct dn_zone | |
44 | { | |
45 | struct dn_zone *dz_next; | |
46 | struct dn_fib_node **dz_hash; | |
47 | int dz_nent; | |
48 | int dz_divisor; | |
49 | u32 dz_hashmask; | |
50 | #define DZ_HASHMASK(dz) ((dz)->dz_hashmask) | |
51 | int dz_order; | |
c4ea94ab | 52 | __le16 dz_mask; |
1da177e4 LT |
53 | #define DZ_MASK(dz) ((dz)->dz_mask) |
54 | }; | |
55 | ||
56 | struct dn_hash | |
57 | { | |
58 | struct dn_zone *dh_zones[17]; | |
59 | struct dn_zone *dh_zone_list; | |
60 | }; | |
61 | ||
62 | #define dz_key_0(key) ((key).datum = 0) | |
1da177e4 LT |
63 | |
64 | #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\ | |
429eb0fa | 65 | for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++) |
1da177e4 LT |
66 | |
67 | #define endfor_nexthops(fi) } | |
68 | ||
69 | #define DN_MAX_DIVISOR 1024 | |
70 | #define DN_S_ZOMBIE 1 | |
71 | #define DN_S_ACCESSED 2 | |
72 | ||
73 | #define DN_FIB_SCAN(f, fp) \ | |
74 | for( ; ((f) = *(fp)) != NULL; (fp) = &(f)->fn_next) | |
75 | ||
76 | #define DN_FIB_SCAN_KEY(f, fp, key) \ | |
77 | for( ; ((f) = *(fp)) != NULL && dn_key_eq((f)->fn_key, (key)); (fp) = &(f)->fn_next) | |
78 | ||
79 | #define RT_TABLE_MIN 1 | |
abcab268 PM |
80 | #define DN_FIB_TABLE_HASHSZ 256 |
81 | static struct hlist_head dn_fib_table_hash[DN_FIB_TABLE_HASHSZ]; | |
1da177e4 | 82 | static DEFINE_RWLOCK(dn_fib_tables_lock); |
1da177e4 | 83 | |
e18b890b | 84 | static struct kmem_cache *dn_hash_kmem __read_mostly; |
1da177e4 LT |
85 | static int dn_fib_hash_zombies; |
86 | ||
87 | static inline dn_fib_idx_t dn_hash(dn_fib_key_t key, struct dn_zone *dz) | |
88 | { | |
c4106aa8 | 89 | u16 h = le16_to_cpu(key.datum)>>(16 - dz->dz_order); |
1da177e4 LT |
90 | h ^= (h >> 10); |
91 | h ^= (h >> 6); | |
92 | h &= DZ_HASHMASK(dz); | |
93 | return *(dn_fib_idx_t *)&h; | |
94 | } | |
95 | ||
c4ea94ab | 96 | static inline dn_fib_key_t dz_key(__le16 dst, struct dn_zone *dz) |
1da177e4 LT |
97 | { |
98 | dn_fib_key_t k; | |
99 | k.datum = dst & DZ_MASK(dz); | |
100 | return k; | |
101 | } | |
102 | ||
103 | static inline struct dn_fib_node **dn_chain_p(dn_fib_key_t key, struct dn_zone *dz) | |
104 | { | |
105 | return &dz->dz_hash[dn_hash(key, dz).datum]; | |
106 | } | |
107 | ||
108 | static inline struct dn_fib_node *dz_chain(dn_fib_key_t key, struct dn_zone *dz) | |
109 | { | |
110 | return dz->dz_hash[dn_hash(key, dz).datum]; | |
111 | } | |
112 | ||
113 | static inline int dn_key_eq(dn_fib_key_t a, dn_fib_key_t b) | |
114 | { | |
115 | return a.datum == b.datum; | |
116 | } | |
117 | ||
118 | static inline int dn_key_leq(dn_fib_key_t a, dn_fib_key_t b) | |
119 | { | |
120 | return a.datum <= b.datum; | |
121 | } | |
122 | ||
123 | static inline void dn_rebuild_zone(struct dn_zone *dz, | |
124 | struct dn_fib_node **old_ht, | |
125 | int old_divisor) | |
126 | { | |
a01c1335 | 127 | struct dn_fib_node *f, **fp, *next; |
1da177e4 | 128 | int i; |
1da177e4 LT |
129 | |
130 | for(i = 0; i < old_divisor; i++) { | |
a01c1335 DM |
131 | for(f = old_ht[i]; f; f = next) { |
132 | next = f->fn_next; | |
1da177e4 LT |
133 | for(fp = dn_chain_p(f->fn_key, dz); |
134 | *fp && dn_key_leq((*fp)->fn_key, f->fn_key); | |
135 | fp = &(*fp)->fn_next) | |
136 | /* NOTHING */; | |
137 | f->fn_next = *fp; | |
138 | *fp = f; | |
139 | } | |
140 | } | |
141 | } | |
142 | ||
143 | static void dn_rehash_zone(struct dn_zone *dz) | |
144 | { | |
145 | struct dn_fib_node **ht, **old_ht; | |
146 | int old_divisor, new_divisor; | |
147 | u32 new_hashmask; | |
148 | ||
149 | old_divisor = dz->dz_divisor; | |
150 | ||
06f8fe11 JP |
151 | switch (old_divisor) { |
152 | case 16: | |
153 | new_divisor = 256; | |
154 | new_hashmask = 0xFF; | |
155 | break; | |
156 | default: | |
157 | printk(KERN_DEBUG "DECnet: dn_rehash_zone: BUG! %d\n", | |
158 | old_divisor); | |
2d919149 | 159 | /* fall through */ |
06f8fe11 JP |
160 | case 256: |
161 | new_divisor = 1024; | |
162 | new_hashmask = 0x3FF; | |
163 | break; | |
1da177e4 LT |
164 | } |
165 | ||
0da974f4 | 166 | ht = kcalloc(new_divisor, sizeof(struct dn_fib_node*), GFP_KERNEL); |
1da177e4 LT |
167 | if (ht == NULL) |
168 | return; | |
169 | ||
1da177e4 LT |
170 | write_lock_bh(&dn_fib_tables_lock); |
171 | old_ht = dz->dz_hash; | |
172 | dz->dz_hash = ht; | |
173 | dz->dz_hashmask = new_hashmask; | |
174 | dz->dz_divisor = new_divisor; | |
175 | dn_rebuild_zone(dz, old_ht, old_divisor); | |
176 | write_unlock_bh(&dn_fib_tables_lock); | |
177 | kfree(old_ht); | |
178 | } | |
179 | ||
180 | static void dn_free_node(struct dn_fib_node *f) | |
181 | { | |
182 | dn_fib_release_info(DN_FIB_INFO(f)); | |
183 | kmem_cache_free(dn_hash_kmem, f); | |
184 | } | |
185 | ||
186 | ||
187 | static struct dn_zone *dn_new_zone(struct dn_hash *table, int z) | |
188 | { | |
189 | int i; | |
0da974f4 | 190 | struct dn_zone *dz = kzalloc(sizeof(struct dn_zone), GFP_KERNEL); |
1da177e4 LT |
191 | if (!dz) |
192 | return NULL; | |
193 | ||
1da177e4 LT |
194 | if (z) { |
195 | dz->dz_divisor = 16; | |
196 | dz->dz_hashmask = 0x0F; | |
197 | } else { | |
198 | dz->dz_divisor = 1; | |
199 | dz->dz_hashmask = 0; | |
200 | } | |
201 | ||
0da974f4 | 202 | dz->dz_hash = kcalloc(dz->dz_divisor, sizeof(struct dn_fib_node *), GFP_KERNEL); |
1da177e4 LT |
203 | if (!dz->dz_hash) { |
204 | kfree(dz); | |
205 | return NULL; | |
206 | } | |
207 | ||
1da177e4 LT |
208 | dz->dz_order = z; |
209 | dz->dz_mask = dnet_make_mask(z); | |
210 | ||
211 | for(i = z + 1; i <= 16; i++) | |
212 | if (table->dh_zones[i]) | |
213 | break; | |
214 | ||
215 | write_lock_bh(&dn_fib_tables_lock); | |
216 | if (i>16) { | |
217 | dz->dz_next = table->dh_zone_list; | |
218 | table->dh_zone_list = dz; | |
219 | } else { | |
220 | dz->dz_next = table->dh_zones[i]->dz_next; | |
221 | table->dh_zones[i]->dz_next = dz; | |
222 | } | |
223 | table->dh_zones[z] = dz; | |
224 | write_unlock_bh(&dn_fib_tables_lock); | |
225 | return dz; | |
226 | } | |
227 | ||
228 | ||
58d7d8f9 | 229 | static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct nlattr *attrs[], struct dn_fib_info *fi) |
1da177e4 LT |
230 | { |
231 | struct rtnexthop *nhp; | |
232 | int nhlen; | |
233 | ||
58d7d8f9 TG |
234 | if (attrs[RTA_PRIORITY] && |
235 | nla_get_u32(attrs[RTA_PRIORITY]) != fi->fib_priority) | |
1da177e4 LT |
236 | return 1; |
237 | ||
58d7d8f9 TG |
238 | if (attrs[RTA_OIF] || attrs[RTA_GATEWAY]) { |
239 | if ((!attrs[RTA_OIF] || nla_get_u32(attrs[RTA_OIF]) == fi->fib_nh->nh_oif) && | |
240 | (!attrs[RTA_GATEWAY] || nla_get_le16(attrs[RTA_GATEWAY]) != fi->fib_nh->nh_gw)) | |
1da177e4 LT |
241 | return 0; |
242 | return 1; | |
243 | } | |
244 | ||
58d7d8f9 | 245 | if (!attrs[RTA_MULTIPATH]) |
1da177e4 LT |
246 | return 0; |
247 | ||
58d7d8f9 TG |
248 | nhp = nla_data(attrs[RTA_MULTIPATH]); |
249 | nhlen = nla_len(attrs[RTA_MULTIPATH]); | |
1da177e4 LT |
250 | |
251 | for_nexthops(fi) { | |
252 | int attrlen = nhlen - sizeof(struct rtnexthop); | |
c4ea94ab | 253 | __le16 gw; |
1da177e4 LT |
254 | |
255 | if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0) | |
256 | return -EINVAL; | |
257 | if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif) | |
258 | return 1; | |
259 | if (attrlen) { | |
58d7d8f9 TG |
260 | struct nlattr *gw_attr; |
261 | ||
262 | gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY); | |
263 | gw = gw_attr ? nla_get_le16(gw_attr) : 0; | |
1da177e4 LT |
264 | |
265 | if (gw && gw != nh->nh_gw) | |
266 | return 1; | |
267 | } | |
268 | nhp = RTNH_NEXT(nhp); | |
269 | } endfor_nexthops(fi); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
339bf98f TG |
274 | static inline size_t dn_fib_nlmsg_size(struct dn_fib_info *fi) |
275 | { | |
75356f27 | 276 | size_t payload = NLMSG_ALIGN(sizeof(struct rtmsg)) |
339bf98f TG |
277 | + nla_total_size(4) /* RTA_TABLE */ |
278 | + nla_total_size(2) /* RTA_DST */ | |
ea697639 DB |
279 | + nla_total_size(4) /* RTA_PRIORITY */ |
280 | + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */ | |
339bf98f TG |
281 | |
282 | /* space for nested metrics */ | |
283 | payload += nla_total_size((RTAX_MAX * nla_total_size(4))); | |
284 | ||
285 | if (fi->fib_nhs) { | |
286 | /* Also handles the special case fib_nhs == 1 */ | |
287 | ||
288 | /* each nexthop is packed in an attribute */ | |
289 | size_t nhsize = nla_total_size(sizeof(struct rtnexthop)); | |
290 | ||
291 | /* may contain a gateway attribute */ | |
292 | nhsize += nla_total_size(4); | |
293 | ||
294 | /* all nexthops are packed in a nested attribute */ | |
295 | payload += nla_total_size(fi->fib_nhs * nhsize); | |
296 | } | |
297 | ||
298 | return payload; | |
299 | } | |
300 | ||
15e47304 | 301 | static int dn_fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, |
429eb0fa YH |
302 | u32 tb_id, u8 type, u8 scope, void *dst, int dst_len, |
303 | struct dn_fib_info *fi, unsigned int flags) | |
1da177e4 | 304 | { |
429eb0fa YH |
305 | struct rtmsg *rtm; |
306 | struct nlmsghdr *nlh; | |
429eb0fa | 307 | |
15e47304 | 308 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); |
3f7a3283 | 309 | if (!nlh) |
6b60978f TG |
310 | return -EMSGSIZE; |
311 | ||
3f7a3283 | 312 | rtm = nlmsg_data(nlh); |
429eb0fa YH |
313 | rtm->rtm_family = AF_DECnet; |
314 | rtm->rtm_dst_len = dst_len; | |
315 | rtm->rtm_src_len = 0; | |
316 | rtm->rtm_tos = 0; | |
317 | rtm->rtm_table = tb_id; | |
429eb0fa YH |
318 | rtm->rtm_flags = fi->fib_flags; |
319 | rtm->rtm_scope = scope; | |
1da177e4 | 320 | rtm->rtm_type = type; |
429eb0fa | 321 | rtm->rtm_protocol = fi->fib_protocol; |
6b60978f TG |
322 | |
323 | if (nla_put_u32(skb, RTA_TABLE, tb_id) < 0) | |
324 | goto errout; | |
325 | ||
326 | if (rtm->rtm_dst_len && | |
327 | nla_put(skb, RTA_DST, 2, dst) < 0) | |
328 | goto errout; | |
329 | ||
330 | if (fi->fib_priority && | |
331 | nla_put_u32(skb, RTA_PRIORITY, fi->fib_priority) < 0) | |
332 | goto errout; | |
333 | ||
1da177e4 | 334 | if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0) |
6b60978f TG |
335 | goto errout; |
336 | ||
429eb0fa | 337 | if (fi->fib_nhs == 1) { |
6b60978f TG |
338 | if (fi->fib_nh->nh_gw && |
339 | nla_put_le16(skb, RTA_GATEWAY, fi->fib_nh->nh_gw) < 0) | |
340 | goto errout; | |
341 | ||
342 | if (fi->fib_nh->nh_oif && | |
343 | nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif) < 0) | |
344 | goto errout; | |
429eb0fa | 345 | } |
6b60978f | 346 | |
429eb0fa YH |
347 | if (fi->fib_nhs > 1) { |
348 | struct rtnexthop *nhp; | |
6b60978f TG |
349 | struct nlattr *mp_head; |
350 | ||
f78c6032 MK |
351 | mp_head = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
352 | if (!mp_head) | |
6b60978f | 353 | goto errout; |
429eb0fa YH |
354 | |
355 | for_nexthops(fi) { | |
6b60978f TG |
356 | if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) |
357 | goto errout; | |
358 | ||
429eb0fa YH |
359 | nhp->rtnh_flags = nh->nh_flags & 0xFF; |
360 | nhp->rtnh_hops = nh->nh_weight - 1; | |
361 | nhp->rtnh_ifindex = nh->nh_oif; | |
6b60978f TG |
362 | |
363 | if (nh->nh_gw && | |
364 | nla_put_le16(skb, RTA_GATEWAY, nh->nh_gw) < 0) | |
365 | goto errout; | |
366 | ||
27a884dc | 367 | nhp->rtnh_len = skb_tail_pointer(skb) - (unsigned char *)nhp; |
429eb0fa | 368 | } endfor_nexthops(fi); |
6b60978f TG |
369 | |
370 | nla_nest_end(skb, mp_head); | |
429eb0fa YH |
371 | } |
372 | ||
053c095a JB |
373 | nlmsg_end(skb, nlh); |
374 | return 0; | |
1da177e4 | 375 | |
6b60978f TG |
376 | errout: |
377 | nlmsg_cancel(skb, nlh); | |
429eb0fa | 378 | return -EMSGSIZE; |
1da177e4 LT |
379 | } |
380 | ||
381 | ||
2dfe55b4 | 382 | static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, u32 tb_id, |
429eb0fa | 383 | struct nlmsghdr *nlh, struct netlink_skb_parms *req) |
1da177e4 | 384 | { |
429eb0fa | 385 | struct sk_buff *skb; |
15e47304 | 386 | u32 portid = req ? req->portid : 0; |
dc738dd8 | 387 | int err = -ENOBUFS; |
1da177e4 | 388 | |
429eb0fa YH |
389 | skb = nlmsg_new(dn_fib_nlmsg_size(DN_FIB_INFO(f)), GFP_KERNEL); |
390 | if (skb == NULL) | |
dc738dd8 | 391 | goto errout; |
1da177e4 | 392 | |
15e47304 | 393 | err = dn_fib_dump_info(skb, portid, nlh->nlmsg_seq, event, tb_id, |
dc738dd8 TG |
394 | f->fn_type, f->fn_scope, &f->fn_key, z, |
395 | DN_FIB_INFO(f), 0); | |
26932566 PM |
396 | if (err < 0) { |
397 | /* -EMSGSIZE implies BUG in dn_fib_nlmsg_size() */ | |
398 | WARN_ON(err == -EMSGSIZE); | |
399 | kfree_skb(skb); | |
400 | goto errout; | |
401 | } | |
15e47304 | 402 | rtnl_notify(skb, &init_net, portid, RTNLGRP_DECnet_ROUTE, nlh, GFP_KERNEL); |
1ce85fe4 | 403 | return; |
dc738dd8 TG |
404 | errout: |
405 | if (err < 0) | |
97c53cac | 406 | rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_ROUTE, err); |
1da177e4 LT |
407 | } |
408 | ||
429eb0fa | 409 | static __inline__ int dn_hash_dump_bucket(struct sk_buff *skb, |
1da177e4 LT |
410 | struct netlink_callback *cb, |
411 | struct dn_fib_table *tb, | |
412 | struct dn_zone *dz, | |
413 | struct dn_fib_node *f) | |
414 | { | |
415 | int i, s_i; | |
416 | ||
abcab268 | 417 | s_i = cb->args[4]; |
1da177e4 LT |
418 | for(i = 0; f; i++, f = f->fn_next) { |
419 | if (i < s_i) | |
420 | continue; | |
421 | if (f->fn_state & DN_S_ZOMBIE) | |
422 | continue; | |
15e47304 | 423 | if (dn_fib_dump_info(skb, NETLINK_CB(cb->skb).portid, |
1da177e4 LT |
424 | cb->nlh->nlmsg_seq, |
425 | RTM_NEWROUTE, | |
429eb0fa | 426 | tb->n, |
1da177e4 | 427 | (f->fn_state & DN_S_ZOMBIE) ? 0 : f->fn_type, |
429eb0fa | 428 | f->fn_scope, &f->fn_key, dz->dz_order, |
b6544c0b | 429 | f->fn_info, NLM_F_MULTI) < 0) { |
abcab268 | 430 | cb->args[4] = i; |
1da177e4 LT |
431 | return -1; |
432 | } | |
433 | } | |
abcab268 | 434 | cb->args[4] = i; |
1da177e4 LT |
435 | return skb->len; |
436 | } | |
437 | ||
429eb0fa | 438 | static __inline__ int dn_hash_dump_zone(struct sk_buff *skb, |
1da177e4 LT |
439 | struct netlink_callback *cb, |
440 | struct dn_fib_table *tb, | |
441 | struct dn_zone *dz) | |
442 | { | |
443 | int h, s_h; | |
444 | ||
abcab268 | 445 | s_h = cb->args[3]; |
1da177e4 LT |
446 | for(h = 0; h < dz->dz_divisor; h++) { |
447 | if (h < s_h) | |
448 | continue; | |
449 | if (h > s_h) | |
abcab268 | 450 | memset(&cb->args[4], 0, sizeof(cb->args) - 4*sizeof(cb->args[0])); |
1da177e4 LT |
451 | if (dz->dz_hash == NULL || dz->dz_hash[h] == NULL) |
452 | continue; | |
453 | if (dn_hash_dump_bucket(skb, cb, tb, dz, dz->dz_hash[h]) < 0) { | |
abcab268 | 454 | cb->args[3] = h; |
1da177e4 LT |
455 | return -1; |
456 | } | |
457 | } | |
abcab268 | 458 | cb->args[3] = h; |
1da177e4 LT |
459 | return skb->len; |
460 | } | |
461 | ||
429eb0fa YH |
462 | static int dn_fib_table_dump(struct dn_fib_table *tb, struct sk_buff *skb, |
463 | struct netlink_callback *cb) | |
1da177e4 | 464 | { |
429eb0fa | 465 | int m, s_m; |
1da177e4 LT |
466 | struct dn_zone *dz; |
467 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
468 | ||
abcab268 | 469 | s_m = cb->args[2]; |
1da177e4 LT |
470 | read_lock(&dn_fib_tables_lock); |
471 | for(dz = table->dh_zone_list, m = 0; dz; dz = dz->dz_next, m++) { | |
472 | if (m < s_m) | |
473 | continue; | |
474 | if (m > s_m) | |
abcab268 | 475 | memset(&cb->args[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0])); |
1da177e4 LT |
476 | |
477 | if (dn_hash_dump_zone(skb, cb, tb, dz) < 0) { | |
abcab268 | 478 | cb->args[2] = m; |
1da177e4 LT |
479 | read_unlock(&dn_fib_tables_lock); |
480 | return -1; | |
481 | } | |
482 | } | |
483 | read_unlock(&dn_fib_tables_lock); | |
abcab268 | 484 | cb->args[2] = m; |
1da177e4 | 485 | |
429eb0fa | 486 | return skb->len; |
1da177e4 LT |
487 | } |
488 | ||
abcab268 PM |
489 | int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb) |
490 | { | |
3b1e0a65 | 491 | struct net *net = sock_net(skb->sk); |
abcab268 PM |
492 | unsigned int h, s_h; |
493 | unsigned int e = 0, s_e; | |
494 | struct dn_fib_table *tb; | |
abcab268 PM |
495 | int dumped = 0; |
496 | ||
09ad9bc7 | 497 | if (!net_eq(net, &init_net)) |
b854272b DL |
498 | return 0; |
499 | ||
573ce260 | 500 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
3f7a3283 | 501 | ((struct rtmsg *)nlmsg_data(cb->nlh))->rtm_flags&RTM_F_CLONED) |
abcab268 PM |
502 | return dn_cache_dump(skb, cb); |
503 | ||
504 | s_h = cb->args[0]; | |
505 | s_e = cb->args[1]; | |
506 | ||
507 | for (h = s_h; h < DN_FIB_TABLE_HASHSZ; h++, s_h = 0) { | |
508 | e = 0; | |
b67bfe0d | 509 | hlist_for_each_entry(tb, &dn_fib_table_hash[h], hlist) { |
abcab268 PM |
510 | if (e < s_e) |
511 | goto next; | |
512 | if (dumped) | |
513 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
429eb0fa | 514 | 2 * sizeof(cb->args[0])); |
abcab268 PM |
515 | if (tb->dump(tb, skb, cb) < 0) |
516 | goto out; | |
517 | dumped = 1; | |
518 | next: | |
519 | e++; | |
520 | } | |
521 | } | |
522 | out: | |
523 | cb->args[1] = e; | |
524 | cb->args[0] = h; | |
525 | ||
526 | return skb->len; | |
527 | } | |
528 | ||
58d7d8f9 TG |
529 | static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct nlattr *attrs[], |
530 | struct nlmsghdr *n, struct netlink_skb_parms *req) | |
1da177e4 LT |
531 | { |
532 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
533 | struct dn_fib_node *new_f, *f, **fp, **del_fp; | |
534 | struct dn_zone *dz; | |
535 | struct dn_fib_info *fi; | |
429eb0fa | 536 | int z = r->rtm_dst_len; |
1da177e4 LT |
537 | int type = r->rtm_type; |
538 | dn_fib_key_t key; | |
429eb0fa | 539 | int err; |
1da177e4 | 540 | |
429eb0fa YH |
541 | if (z > 16) |
542 | return -EINVAL; | |
1da177e4 LT |
543 | |
544 | dz = table->dh_zones[z]; | |
545 | if (!dz && !(dz = dn_new_zone(table, z))) | |
546 | return -ENOBUFS; | |
547 | ||
548 | dz_key_0(key); | |
58d7d8f9 TG |
549 | if (attrs[RTA_DST]) { |
550 | __le16 dst = nla_get_le16(attrs[RTA_DST]); | |
1da177e4 LT |
551 | if (dst & ~DZ_MASK(dz)) |
552 | return -EINVAL; | |
553 | key = dz_key(dst, dz); | |
554 | } | |
555 | ||
58d7d8f9 | 556 | if ((fi = dn_fib_create_info(r, attrs, n, &err)) == NULL) |
429eb0fa | 557 | return err; |
1da177e4 LT |
558 | |
559 | if (dz->dz_nent > (dz->dz_divisor << 2) && | |
560 | dz->dz_divisor > DN_MAX_DIVISOR && | |
561 | (z==16 || (1<<z) > dz->dz_divisor)) | |
562 | dn_rehash_zone(dz); | |
563 | ||
564 | fp = dn_chain_p(key, dz); | |
565 | ||
566 | DN_FIB_SCAN(f, fp) { | |
567 | if (dn_key_leq(key, f->fn_key)) | |
568 | break; | |
569 | } | |
570 | ||
571 | del_fp = NULL; | |
572 | ||
573 | if (f && (f->fn_state & DN_S_ZOMBIE) && | |
574 | dn_key_eq(f->fn_key, key)) { | |
575 | del_fp = fp; | |
576 | fp = &f->fn_next; | |
577 | f = *fp; | |
578 | goto create; | |
579 | } | |
580 | ||
581 | DN_FIB_SCAN_KEY(f, fp, key) { | |
582 | if (fi->fib_priority <= DN_FIB_INFO(f)->fib_priority) | |
583 | break; | |
584 | } | |
585 | ||
586 | if (f && dn_key_eq(f->fn_key, key) && | |
587 | fi->fib_priority == DN_FIB_INFO(f)->fib_priority) { | |
588 | struct dn_fib_node **ins_fp; | |
589 | ||
590 | err = -EEXIST; | |
591 | if (n->nlmsg_flags & NLM_F_EXCL) | |
592 | goto out; | |
593 | ||
594 | if (n->nlmsg_flags & NLM_F_REPLACE) { | |
595 | del_fp = fp; | |
596 | fp = &f->fn_next; | |
597 | f = *fp; | |
598 | goto replace; | |
599 | } | |
600 | ||
601 | ins_fp = fp; | |
602 | err = -EEXIST; | |
603 | ||
604 | DN_FIB_SCAN_KEY(f, fp, key) { | |
605 | if (fi->fib_priority != DN_FIB_INFO(f)->fib_priority) | |
606 | break; | |
f64f9e71 JP |
607 | if (f->fn_type == type && |
608 | f->fn_scope == r->rtm_scope && | |
609 | DN_FIB_INFO(f) == fi) | |
1da177e4 LT |
610 | goto out; |
611 | } | |
612 | ||
613 | if (!(n->nlmsg_flags & NLM_F_APPEND)) { | |
614 | fp = ins_fp; | |
615 | f = *fp; | |
616 | } | |
617 | } | |
618 | ||
619 | create: | |
620 | err = -ENOENT; | |
621 | if (!(n->nlmsg_flags & NLM_F_CREATE)) | |
622 | goto out; | |
623 | ||
624 | replace: | |
625 | err = -ENOBUFS; | |
c3762229 | 626 | new_f = kmem_cache_zalloc(dn_hash_kmem, GFP_KERNEL); |
1da177e4 LT |
627 | if (new_f == NULL) |
628 | goto out; | |
629 | ||
1da177e4 LT |
630 | new_f->fn_key = key; |
631 | new_f->fn_type = type; | |
632 | new_f->fn_scope = r->rtm_scope; | |
633 | DN_FIB_INFO(new_f) = fi; | |
634 | ||
635 | new_f->fn_next = f; | |
636 | write_lock_bh(&dn_fib_tables_lock); | |
637 | *fp = new_f; | |
638 | write_unlock_bh(&dn_fib_tables_lock); | |
639 | dz->dz_nent++; | |
640 | ||
641 | if (del_fp) { | |
642 | f = *del_fp; | |
643 | write_lock_bh(&dn_fib_tables_lock); | |
644 | *del_fp = f->fn_next; | |
645 | write_unlock_bh(&dn_fib_tables_lock); | |
646 | ||
647 | if (!(f->fn_state & DN_S_ZOMBIE)) | |
648 | dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req); | |
649 | if (f->fn_state & DN_S_ACCESSED) | |
650 | dn_rt_cache_flush(-1); | |
651 | dn_free_node(f); | |
652 | dz->dz_nent--; | |
653 | } else { | |
654 | dn_rt_cache_flush(-1); | |
655 | } | |
656 | ||
429eb0fa | 657 | dn_rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->n, n, req); |
1da177e4 | 658 | |
429eb0fa | 659 | return 0; |
1da177e4 LT |
660 | out: |
661 | dn_fib_release_info(fi); | |
662 | return err; | |
663 | } | |
664 | ||
665 | ||
58d7d8f9 TG |
666 | static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct nlattr *attrs[], |
667 | struct nlmsghdr *n, struct netlink_skb_parms *req) | |
1da177e4 LT |
668 | { |
669 | struct dn_hash *table = (struct dn_hash*)tb->data; | |
670 | struct dn_fib_node **fp, **del_fp, *f; | |
429eb0fa | 671 | int z = r->rtm_dst_len; |
1da177e4 LT |
672 | struct dn_zone *dz; |
673 | dn_fib_key_t key; | |
674 | int matched; | |
675 | ||
676 | ||
429eb0fa YH |
677 | if (z > 16) |
678 | return -EINVAL; | |
1da177e4 LT |
679 | |
680 | if ((dz = table->dh_zones[z]) == NULL) | |
681 | return -ESRCH; | |
682 | ||
683 | dz_key_0(key); | |
58d7d8f9 TG |
684 | if (attrs[RTA_DST]) { |
685 | __le16 dst = nla_get_le16(attrs[RTA_DST]); | |
1da177e4 LT |
686 | if (dst & ~DZ_MASK(dz)) |
687 | return -EINVAL; | |
688 | key = dz_key(dst, dz); | |
689 | } | |
690 | ||
691 | fp = dn_chain_p(key, dz); | |
692 | ||
693 | DN_FIB_SCAN(f, fp) { | |
694 | if (dn_key_eq(f->fn_key, key)) | |
695 | break; | |
696 | if (dn_key_leq(key, f->fn_key)) | |
697 | return -ESRCH; | |
698 | } | |
699 | ||
700 | matched = 0; | |
701 | del_fp = NULL; | |
702 | DN_FIB_SCAN_KEY(f, fp, key) { | |
703 | struct dn_fib_info *fi = DN_FIB_INFO(f); | |
704 | ||
705 | if (f->fn_state & DN_S_ZOMBIE) | |
706 | return -ESRCH; | |
707 | ||
708 | matched++; | |
709 | ||
710 | if (del_fp == NULL && | |
711 | (!r->rtm_type || f->fn_type == r->rtm_type) && | |
712 | (r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) && | |
429eb0fa | 713 | (!r->rtm_protocol || |
1da177e4 | 714 | fi->fib_protocol == r->rtm_protocol) && |
58d7d8f9 | 715 | dn_fib_nh_match(r, n, attrs, fi) == 0) |
1da177e4 LT |
716 | del_fp = fp; |
717 | } | |
718 | ||
719 | if (del_fp) { | |
720 | f = *del_fp; | |
429eb0fa | 721 | dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req); |
1da177e4 LT |
722 | |
723 | if (matched != 1) { | |
724 | write_lock_bh(&dn_fib_tables_lock); | |
725 | *del_fp = f->fn_next; | |
726 | write_unlock_bh(&dn_fib_tables_lock); | |
727 | ||
728 | if (f->fn_state & DN_S_ACCESSED) | |
729 | dn_rt_cache_flush(-1); | |
730 | dn_free_node(f); | |
731 | dz->dz_nent--; | |
732 | } else { | |
733 | f->fn_state |= DN_S_ZOMBIE; | |
734 | if (f->fn_state & DN_S_ACCESSED) { | |
735 | f->fn_state &= ~DN_S_ACCESSED; | |
736 | dn_rt_cache_flush(-1); | |
737 | } | |
738 | if (++dn_fib_hash_zombies > 128) | |
739 | dn_fib_flush(); | |
740 | } | |
741 | ||
742 | return 0; | |
743 | } | |
744 | ||
429eb0fa | 745 | return -ESRCH; |
1da177e4 LT |
746 | } |
747 | ||
748 | static inline int dn_flush_list(struct dn_fib_node **fp, int z, struct dn_hash *table) | |
749 | { | |
750 | int found = 0; | |
751 | struct dn_fib_node *f; | |
752 | ||
753 | while((f = *fp) != NULL) { | |
754 | struct dn_fib_info *fi = DN_FIB_INFO(f); | |
755 | ||
756 | if (fi && ((f->fn_state & DN_S_ZOMBIE) || (fi->fib_flags & RTNH_F_DEAD))) { | |
757 | write_lock_bh(&dn_fib_tables_lock); | |
758 | *fp = f->fn_next; | |
759 | write_unlock_bh(&dn_fib_tables_lock); | |
760 | ||
761 | dn_free_node(f); | |
762 | found++; | |
763 | continue; | |
764 | } | |
765 | fp = &f->fn_next; | |
766 | } | |
767 | ||
768 | return found; | |
769 | } | |
770 | ||
771 | static int dn_fib_table_flush(struct dn_fib_table *tb) | |
772 | { | |
773 | struct dn_hash *table = (struct dn_hash *)tb->data; | |
774 | struct dn_zone *dz; | |
775 | int found = 0; | |
776 | ||
777 | dn_fib_hash_zombies = 0; | |
778 | for(dz = table->dh_zone_list; dz; dz = dz->dz_next) { | |
779 | int i; | |
780 | int tmp = 0; | |
781 | for(i = dz->dz_divisor-1; i >= 0; i--) | |
782 | tmp += dn_flush_list(&dz->dz_hash[i], dz->dz_order, table); | |
783 | dz->dz_nent -= tmp; | |
784 | found += tmp; | |
785 | } | |
786 | ||
787 | return found; | |
788 | } | |
789 | ||
bef55aeb | 790 | static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct flowidn *flp, struct dn_fib_res *res) |
1da177e4 | 791 | { |
429eb0fa | 792 | int err; |
1da177e4 LT |
793 | struct dn_zone *dz; |
794 | struct dn_hash *t = (struct dn_hash *)tb->data; | |
795 | ||
796 | read_lock(&dn_fib_tables_lock); | |
797 | for(dz = t->dh_zone_list; dz; dz = dz->dz_next) { | |
798 | struct dn_fib_node *f; | |
bef55aeb | 799 | dn_fib_key_t k = dz_key(flp->daddr, dz); |
1da177e4 LT |
800 | |
801 | for(f = dz_chain(k, dz); f; f = f->fn_next) { | |
802 | if (!dn_key_eq(k, f->fn_key)) { | |
803 | if (dn_key_leq(k, f->fn_key)) | |
804 | break; | |
805 | else | |
806 | continue; | |
807 | } | |
808 | ||
809 | f->fn_state |= DN_S_ACCESSED; | |
810 | ||
811 | if (f->fn_state&DN_S_ZOMBIE) | |
812 | continue; | |
813 | ||
bef55aeb | 814 | if (f->fn_scope < flp->flowidn_scope) |
1da177e4 LT |
815 | continue; |
816 | ||
817 | err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), flp, res); | |
818 | ||
819 | if (err == 0) { | |
820 | res->type = f->fn_type; | |
429eb0fa | 821 | res->scope = f->fn_scope; |
1da177e4 LT |
822 | res->prefixlen = dz->dz_order; |
823 | goto out; | |
824 | } | |
825 | if (err < 0) | |
826 | goto out; | |
827 | } | |
828 | } | |
829 | err = 1; | |
830 | out: | |
831 | read_unlock(&dn_fib_tables_lock); | |
429eb0fa | 832 | return err; |
1da177e4 LT |
833 | } |
834 | ||
835 | ||
2dfe55b4 | 836 | struct dn_fib_table *dn_fib_get_table(u32 n, int create) |
1da177e4 | 837 | { |
429eb0fa | 838 | struct dn_fib_table *t; |
abcab268 | 839 | unsigned int h; |
1da177e4 | 840 | |
429eb0fa YH |
841 | if (n < RT_TABLE_MIN) |
842 | return NULL; | |
1da177e4 | 843 | |
429eb0fa YH |
844 | if (n > RT_TABLE_MAX) |
845 | return NULL; | |
1da177e4 | 846 | |
abcab268 PM |
847 | h = n & (DN_FIB_TABLE_HASHSZ - 1); |
848 | rcu_read_lock(); | |
b67bfe0d | 849 | hlist_for_each_entry_rcu(t, &dn_fib_table_hash[h], hlist) { |
abcab268 PM |
850 | if (t->n == n) { |
851 | rcu_read_unlock(); | |
852 | return t; | |
853 | } | |
854 | } | |
855 | rcu_read_unlock(); | |
1da177e4 | 856 | |
429eb0fa YH |
857 | if (!create) |
858 | return NULL; | |
1da177e4 | 859 | |
e87cc472 JP |
860 | if (in_interrupt()) { |
861 | net_dbg_ratelimited("DECnet: BUG! Attempt to create routing table from interrupt\n"); | |
429eb0fa YH |
862 | return NULL; |
863 | } | |
1da177e4 | 864 | |
429eb0fa | 865 | t = kzalloc(sizeof(struct dn_fib_table) + sizeof(struct dn_hash), |
e6b61105 | 866 | GFP_KERNEL); |
429eb0fa YH |
867 | if (t == NULL) |
868 | return NULL; | |
869 | ||
870 | t->n = n; | |
871 | t->insert = dn_fib_table_insert; | |
872 | t->delete = dn_fib_table_delete; | |
873 | t->lookup = dn_fib_table_lookup; | |
874 | t->flush = dn_fib_table_flush; | |
875 | t->dump = dn_fib_table_dump; | |
abcab268 | 876 | hlist_add_head_rcu(&t->hlist, &dn_fib_table_hash[h]); |
1da177e4 | 877 | |
429eb0fa | 878 | return t; |
1da177e4 LT |
879 | } |
880 | ||
1da177e4 LT |
881 | struct dn_fib_table *dn_fib_empty_table(void) |
882 | { | |
429eb0fa | 883 | u32 id; |
1da177e4 | 884 | |
429eb0fa | 885 | for(id = RT_TABLE_MIN; id <= RT_TABLE_MAX; id++) |
abcab268 | 886 | if (dn_fib_get_table(id, 0) == NULL) |
429eb0fa YH |
887 | return dn_fib_get_table(id, 1); |
888 | return NULL; | |
1da177e4 LT |
889 | } |
890 | ||
abcab268 PM |
891 | void dn_fib_flush(void) |
892 | { | |
429eb0fa YH |
893 | int flushed = 0; |
894 | struct dn_fib_table *tb; | |
abcab268 PM |
895 | unsigned int h; |
896 | ||
897 | for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) { | |
b67bfe0d | 898 | hlist_for_each_entry(tb, &dn_fib_table_hash[h], hlist) |
429eb0fa YH |
899 | flushed += tb->flush(tb); |
900 | } | |
abcab268 | 901 | |
429eb0fa YH |
902 | if (flushed) |
903 | dn_rt_cache_flush(-1); | |
abcab268 PM |
904 | } |
905 | ||
1da177e4 LT |
906 | void __init dn_fib_table_init(void) |
907 | { | |
908 | dn_hash_kmem = kmem_cache_create("dn_fib_info_cache", | |
909 | sizeof(struct dn_fib_info), | |
910 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 911 | NULL); |
1da177e4 LT |
912 | } |
913 | ||
914 | void __exit dn_fib_table_cleanup(void) | |
915 | { | |
abcab268 | 916 | struct dn_fib_table *t; |
b67bfe0d | 917 | struct hlist_node *next; |
abcab268 | 918 | unsigned int h; |
1da177e4 | 919 | |
abcab268 PM |
920 | write_lock(&dn_fib_tables_lock); |
921 | for (h = 0; h < DN_FIB_TABLE_HASHSZ; h++) { | |
b67bfe0d | 922 | hlist_for_each_entry_safe(t, next, &dn_fib_table_hash[h], |
429eb0fa | 923 | hlist) { |
abcab268 PM |
924 | hlist_del(&t->hlist); |
925 | kfree(t); | |
926 | } | |
927 | } | |
928 | write_unlock(&dn_fib_tables_lock); | |
1da177e4 | 929 | } |