Commit | Line | Data |
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7f00feaf TH |
1 | #include <linux/jhash.h> |
2 | #include <linux/netfilter.h> | |
3 | #include <linux/rcupdate.h> | |
4 | #include <linux/rhashtable.h> | |
5 | #include <linux/vmalloc.h> | |
6 | #include <net/genetlink.h> | |
7 | #include <net/ila.h> | |
8 | #include <net/netns/generic.h> | |
9 | #include <uapi/linux/genetlink.h> | |
10 | #include "ila.h" | |
11 | ||
12 | struct ila_xlat_params { | |
13 | struct ila_params ip; | |
7f00feaf | 14 | int ifindex; |
7f00feaf TH |
15 | }; |
16 | ||
17 | struct ila_map { | |
351596aa | 18 | struct ila_xlat_params xp; |
7f00feaf TH |
19 | struct rhash_head node; |
20 | struct ila_map __rcu *next; | |
21 | struct rcu_head rcu; | |
22 | }; | |
23 | ||
24 | static unsigned int ila_net_id; | |
25 | ||
26 | struct ila_net { | |
27 | struct rhashtable rhash_table; | |
28 | spinlock_t *locks; /* Bucket locks for entry manipulation */ | |
29 | unsigned int locks_mask; | |
30 | bool hooks_registered; | |
31 | }; | |
32 | ||
33 | #define LOCKS_PER_CPU 10 | |
34 | ||
35 | static int alloc_ila_locks(struct ila_net *ilan) | |
36 | { | |
37 | unsigned int i, size; | |
38 | unsigned int nr_pcpus = num_possible_cpus(); | |
39 | ||
40 | nr_pcpus = min_t(unsigned int, nr_pcpus, 32UL); | |
41 | size = roundup_pow_of_two(nr_pcpus * LOCKS_PER_CPU); | |
42 | ||
43 | if (sizeof(spinlock_t) != 0) { | |
44 | #ifdef CONFIG_NUMA | |
45 | if (size * sizeof(spinlock_t) > PAGE_SIZE) | |
46 | ilan->locks = vmalloc(size * sizeof(spinlock_t)); | |
47 | else | |
48 | #endif | |
49 | ilan->locks = kmalloc_array(size, sizeof(spinlock_t), | |
50 | GFP_KERNEL); | |
51 | if (!ilan->locks) | |
52 | return -ENOMEM; | |
53 | for (i = 0; i < size; i++) | |
54 | spin_lock_init(&ilan->locks[i]); | |
55 | } | |
56 | ilan->locks_mask = size - 1; | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
61 | static u32 hashrnd __read_mostly; | |
62 | static __always_inline void __ila_hash_secret_init(void) | |
63 | { | |
64 | net_get_random_once(&hashrnd, sizeof(hashrnd)); | |
65 | } | |
66 | ||
642c2c95 | 67 | static inline u32 ila_locator_hash(struct ila_locator loc) |
7f00feaf | 68 | { |
642c2c95 | 69 | u32 *v = (u32 *)loc.v32; |
7f00feaf TH |
70 | |
71 | return jhash_2words(v[0], v[1], hashrnd); | |
72 | } | |
73 | ||
351596aa | 74 | static inline spinlock_t *ila_get_lock(struct ila_net *ilan, |
642c2c95 | 75 | struct ila_locator loc) |
7f00feaf | 76 | { |
642c2c95 | 77 | return &ilan->locks[ila_locator_hash(loc) & ilan->locks_mask]; |
7f00feaf TH |
78 | } |
79 | ||
351596aa | 80 | static inline int ila_cmp_wildcards(struct ila_map *ila, |
642c2c95 | 81 | struct ila_addr *iaddr, int ifindex) |
7f00feaf | 82 | { |
642c2c95 | 83 | return (ila->xp.ifindex && ila->xp.ifindex != ifindex); |
7f00feaf TH |
84 | } |
85 | ||
351596aa TH |
86 | static inline int ila_cmp_params(struct ila_map *ila, |
87 | struct ila_xlat_params *xp) | |
7f00feaf | 88 | { |
642c2c95 | 89 | return (ila->xp.ifindex != xp->ifindex); |
7f00feaf TH |
90 | } |
91 | ||
92 | static int ila_cmpfn(struct rhashtable_compare_arg *arg, | |
93 | const void *obj) | |
94 | { | |
95 | const struct ila_map *ila = obj; | |
96 | ||
642c2c95 | 97 | return (ila->xp.ip.locator_match.v64 != *(__be64 *)arg->key); |
7f00feaf TH |
98 | } |
99 | ||
100 | static inline int ila_order(struct ila_map *ila) | |
101 | { | |
102 | int score = 0; | |
103 | ||
351596aa | 104 | if (ila->xp.ifindex) |
7f00feaf TH |
105 | score += 1 << 1; |
106 | ||
107 | return score; | |
108 | } | |
109 | ||
110 | static const struct rhashtable_params rht_params = { | |
111 | .nelem_hint = 1024, | |
112 | .head_offset = offsetof(struct ila_map, node), | |
642c2c95 | 113 | .key_offset = offsetof(struct ila_map, xp.ip.locator_match), |
7f00feaf TH |
114 | .key_len = sizeof(u64), /* identifier */ |
115 | .max_size = 1048576, | |
116 | .min_size = 256, | |
117 | .automatic_shrinking = true, | |
118 | .obj_cmpfn = ila_cmpfn, | |
119 | }; | |
120 | ||
121 | static struct genl_family ila_nl_family = { | |
122 | .id = GENL_ID_GENERATE, | |
123 | .hdrsize = 0, | |
124 | .name = ILA_GENL_NAME, | |
125 | .version = ILA_GENL_VERSION, | |
126 | .maxattr = ILA_ATTR_MAX, | |
127 | .netnsok = true, | |
128 | .parallel_ops = true, | |
129 | }; | |
130 | ||
131 | static struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = { | |
7f00feaf TH |
132 | [ILA_ATTR_LOCATOR] = { .type = NLA_U64, }, |
133 | [ILA_ATTR_LOCATOR_MATCH] = { .type = NLA_U64, }, | |
134 | [ILA_ATTR_IFINDEX] = { .type = NLA_U32, }, | |
90bfe662 | 135 | [ILA_ATTR_CSUM_MODE] = { .type = NLA_U8, }, |
7f00feaf TH |
136 | }; |
137 | ||
138 | static int parse_nl_config(struct genl_info *info, | |
351596aa | 139 | struct ila_xlat_params *xp) |
7f00feaf | 140 | { |
351596aa | 141 | memset(xp, 0, sizeof(*xp)); |
7f00feaf | 142 | |
7f00feaf | 143 | if (info->attrs[ILA_ATTR_LOCATOR]) |
351596aa | 144 | xp->ip.locator.v64 = (__force __be64)nla_get_u64( |
7f00feaf TH |
145 | info->attrs[ILA_ATTR_LOCATOR]); |
146 | ||
147 | if (info->attrs[ILA_ATTR_LOCATOR_MATCH]) | |
351596aa | 148 | xp->ip.locator_match.v64 = (__force __be64)nla_get_u64( |
7f00feaf TH |
149 | info->attrs[ILA_ATTR_LOCATOR_MATCH]); |
150 | ||
90bfe662 TH |
151 | if (info->attrs[ILA_ATTR_CSUM_MODE]) |
152 | xp->ip.csum_mode = nla_get_u8(info->attrs[ILA_ATTR_CSUM_MODE]); | |
153 | ||
7f00feaf | 154 | if (info->attrs[ILA_ATTR_IFINDEX]) |
351596aa | 155 | xp->ifindex = nla_get_s32(info->attrs[ILA_ATTR_IFINDEX]); |
7f00feaf | 156 | |
7f00feaf TH |
157 | return 0; |
158 | } | |
159 | ||
160 | /* Must be called with rcu readlock */ | |
351596aa | 161 | static inline struct ila_map *ila_lookup_wildcards(struct ila_addr *iaddr, |
7f00feaf | 162 | int ifindex, |
7f00feaf TH |
163 | struct ila_net *ilan) |
164 | { | |
165 | struct ila_map *ila; | |
166 | ||
642c2c95 | 167 | ila = rhashtable_lookup_fast(&ilan->rhash_table, &iaddr->loc, |
351596aa | 168 | rht_params); |
7f00feaf | 169 | while (ila) { |
642c2c95 | 170 | if (!ila_cmp_wildcards(ila, iaddr, ifindex)) |
7f00feaf TH |
171 | return ila; |
172 | ila = rcu_access_pointer(ila->next); | |
173 | } | |
174 | ||
175 | return NULL; | |
176 | } | |
177 | ||
178 | /* Must be called with rcu readlock */ | |
351596aa | 179 | static inline struct ila_map *ila_lookup_by_params(struct ila_xlat_params *xp, |
7f00feaf TH |
180 | struct ila_net *ilan) |
181 | { | |
182 | struct ila_map *ila; | |
183 | ||
642c2c95 TH |
184 | ila = rhashtable_lookup_fast(&ilan->rhash_table, |
185 | &xp->ip.locator_match, | |
7f00feaf TH |
186 | rht_params); |
187 | while (ila) { | |
351596aa | 188 | if (!ila_cmp_params(ila, xp)) |
7f00feaf TH |
189 | return ila; |
190 | ila = rcu_access_pointer(ila->next); | |
191 | } | |
192 | ||
193 | return NULL; | |
194 | } | |
195 | ||
196 | static inline void ila_release(struct ila_map *ila) | |
197 | { | |
198 | kfree_rcu(ila, rcu); | |
199 | } | |
200 | ||
201 | static void ila_free_cb(void *ptr, void *arg) | |
202 | { | |
203 | struct ila_map *ila = (struct ila_map *)ptr, *next; | |
204 | ||
205 | /* Assume rcu_readlock held */ | |
206 | while (ila) { | |
207 | next = rcu_access_pointer(ila->next); | |
208 | ila_release(ila); | |
209 | ila = next; | |
210 | } | |
211 | } | |
212 | ||
707a2ca4 | 213 | static int ila_xlat_addr(struct sk_buff *skb, bool set_csum_neutral); |
7f00feaf TH |
214 | |
215 | static unsigned int | |
216 | ila_nf_input(void *priv, | |
217 | struct sk_buff *skb, | |
218 | const struct nf_hook_state *state) | |
219 | { | |
707a2ca4 | 220 | ila_xlat_addr(skb, false); |
7f00feaf TH |
221 | return NF_ACCEPT; |
222 | } | |
223 | ||
224 | static struct nf_hook_ops ila_nf_hook_ops[] __read_mostly = { | |
225 | { | |
226 | .hook = ila_nf_input, | |
227 | .pf = NFPROTO_IPV6, | |
228 | .hooknum = NF_INET_PRE_ROUTING, | |
229 | .priority = -1, | |
230 | }, | |
231 | }; | |
232 | ||
351596aa | 233 | static int ila_add_mapping(struct net *net, struct ila_xlat_params *xp) |
7f00feaf TH |
234 | { |
235 | struct ila_net *ilan = net_generic(net, ila_net_id); | |
236 | struct ila_map *ila, *head; | |
642c2c95 | 237 | spinlock_t *lock = ila_get_lock(ilan, xp->ip.locator_match); |
7f00feaf TH |
238 | int err = 0, order; |
239 | ||
240 | if (!ilan->hooks_registered) { | |
241 | /* We defer registering net hooks in the namespace until the | |
242 | * first mapping is added. | |
243 | */ | |
244 | err = nf_register_net_hooks(net, ila_nf_hook_ops, | |
245 | ARRAY_SIZE(ila_nf_hook_ops)); | |
246 | if (err) | |
247 | return err; | |
248 | ||
249 | ilan->hooks_registered = true; | |
250 | } | |
251 | ||
252 | ila = kzalloc(sizeof(*ila), GFP_KERNEL); | |
253 | if (!ila) | |
254 | return -ENOMEM; | |
255 | ||
90bfe662 | 256 | ila_init_saved_csum(&xp->ip); |
7f00feaf | 257 | |
90bfe662 | 258 | ila->xp = *xp; |
7f00feaf TH |
259 | |
260 | order = ila_order(ila); | |
261 | ||
262 | spin_lock(lock); | |
263 | ||
642c2c95 TH |
264 | head = rhashtable_lookup_fast(&ilan->rhash_table, |
265 | &xp->ip.locator_match, | |
7f00feaf TH |
266 | rht_params); |
267 | if (!head) { | |
268 | /* New entry for the rhash_table */ | |
269 | err = rhashtable_lookup_insert_fast(&ilan->rhash_table, | |
270 | &ila->node, rht_params); | |
271 | } else { | |
272 | struct ila_map *tila = head, *prev = NULL; | |
273 | ||
274 | do { | |
351596aa | 275 | if (!ila_cmp_params(tila, xp)) { |
7f00feaf TH |
276 | err = -EEXIST; |
277 | goto out; | |
278 | } | |
279 | ||
280 | if (order > ila_order(tila)) | |
281 | break; | |
282 | ||
283 | prev = tila; | |
284 | tila = rcu_dereference_protected(tila->next, | |
285 | lockdep_is_held(lock)); | |
286 | } while (tila); | |
287 | ||
288 | if (prev) { | |
289 | /* Insert in sub list of head */ | |
290 | RCU_INIT_POINTER(ila->next, tila); | |
291 | rcu_assign_pointer(prev->next, ila); | |
292 | } else { | |
293 | /* Make this ila new head */ | |
294 | RCU_INIT_POINTER(ila->next, head); | |
295 | err = rhashtable_replace_fast(&ilan->rhash_table, | |
296 | &head->node, | |
297 | &ila->node, rht_params); | |
298 | if (err) | |
299 | goto out; | |
300 | } | |
301 | } | |
302 | ||
303 | out: | |
304 | spin_unlock(lock); | |
305 | ||
306 | if (err) | |
307 | kfree(ila); | |
308 | ||
309 | return err; | |
310 | } | |
311 | ||
351596aa | 312 | static int ila_del_mapping(struct net *net, struct ila_xlat_params *xp) |
7f00feaf TH |
313 | { |
314 | struct ila_net *ilan = net_generic(net, ila_net_id); | |
315 | struct ila_map *ila, *head, *prev; | |
642c2c95 | 316 | spinlock_t *lock = ila_get_lock(ilan, xp->ip.locator_match); |
7f00feaf TH |
317 | int err = -ENOENT; |
318 | ||
319 | spin_lock(lock); | |
320 | ||
321 | head = rhashtable_lookup_fast(&ilan->rhash_table, | |
642c2c95 | 322 | &xp->ip.locator_match, rht_params); |
7f00feaf TH |
323 | ila = head; |
324 | ||
325 | prev = NULL; | |
326 | ||
327 | while (ila) { | |
351596aa | 328 | if (ila_cmp_params(ila, xp)) { |
7f00feaf TH |
329 | prev = ila; |
330 | ila = rcu_dereference_protected(ila->next, | |
331 | lockdep_is_held(lock)); | |
332 | continue; | |
333 | } | |
334 | ||
335 | err = 0; | |
336 | ||
337 | if (prev) { | |
338 | /* Not head, just delete from list */ | |
339 | rcu_assign_pointer(prev->next, ila->next); | |
340 | } else { | |
341 | /* It is the head. If there is something in the | |
342 | * sublist we need to make a new head. | |
343 | */ | |
344 | head = rcu_dereference_protected(ila->next, | |
345 | lockdep_is_held(lock)); | |
346 | if (head) { | |
347 | /* Put first entry in the sublist into the | |
348 | * table | |
349 | */ | |
350 | err = rhashtable_replace_fast( | |
351 | &ilan->rhash_table, &ila->node, | |
352 | &head->node, rht_params); | |
353 | if (err) | |
354 | goto out; | |
355 | } else { | |
356 | /* Entry no longer used */ | |
357 | err = rhashtable_remove_fast(&ilan->rhash_table, | |
358 | &ila->node, | |
359 | rht_params); | |
360 | } | |
361 | } | |
362 | ||
363 | ila_release(ila); | |
364 | ||
365 | break; | |
366 | } | |
367 | ||
368 | out: | |
369 | spin_unlock(lock); | |
370 | ||
371 | return err; | |
372 | } | |
373 | ||
374 | static int ila_nl_cmd_add_mapping(struct sk_buff *skb, struct genl_info *info) | |
375 | { | |
376 | struct net *net = genl_info_net(info); | |
377 | struct ila_xlat_params p; | |
378 | int err; | |
379 | ||
380 | err = parse_nl_config(info, &p); | |
381 | if (err) | |
382 | return err; | |
383 | ||
384 | return ila_add_mapping(net, &p); | |
385 | } | |
386 | ||
387 | static int ila_nl_cmd_del_mapping(struct sk_buff *skb, struct genl_info *info) | |
388 | { | |
389 | struct net *net = genl_info_net(info); | |
351596aa | 390 | struct ila_xlat_params xp; |
7f00feaf TH |
391 | int err; |
392 | ||
351596aa | 393 | err = parse_nl_config(info, &xp); |
7f00feaf TH |
394 | if (err) |
395 | return err; | |
396 | ||
351596aa | 397 | ila_del_mapping(net, &xp); |
7f00feaf TH |
398 | |
399 | return 0; | |
400 | } | |
401 | ||
402 | static int ila_fill_info(struct ila_map *ila, struct sk_buff *msg) | |
403 | { | |
642c2c95 | 404 | if (nla_put_u64_64bit(msg, ILA_ATTR_LOCATOR, |
351596aa | 405 | (__force u64)ila->xp.ip.locator.v64, |
f13a82d8 ND |
406 | ILA_ATTR_PAD) || |
407 | nla_put_u64_64bit(msg, ILA_ATTR_LOCATOR_MATCH, | |
351596aa | 408 | (__force u64)ila->xp.ip.locator_match.v64, |
f13a82d8 | 409 | ILA_ATTR_PAD) || |
90bfe662 TH |
410 | nla_put_s32(msg, ILA_ATTR_IFINDEX, ila->xp.ifindex) || |
411 | nla_put_u32(msg, ILA_ATTR_CSUM_MODE, ila->xp.ip.csum_mode)) | |
7f00feaf TH |
412 | return -1; |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
417 | static int ila_dump_info(struct ila_map *ila, | |
418 | u32 portid, u32 seq, u32 flags, | |
419 | struct sk_buff *skb, u8 cmd) | |
420 | { | |
421 | void *hdr; | |
422 | ||
423 | hdr = genlmsg_put(skb, portid, seq, &ila_nl_family, flags, cmd); | |
424 | if (!hdr) | |
425 | return -ENOMEM; | |
426 | ||
427 | if (ila_fill_info(ila, skb) < 0) | |
428 | goto nla_put_failure; | |
429 | ||
430 | genlmsg_end(skb, hdr); | |
431 | return 0; | |
432 | ||
433 | nla_put_failure: | |
434 | genlmsg_cancel(skb, hdr); | |
435 | return -EMSGSIZE; | |
436 | } | |
437 | ||
438 | static int ila_nl_cmd_get_mapping(struct sk_buff *skb, struct genl_info *info) | |
439 | { | |
440 | struct net *net = genl_info_net(info); | |
441 | struct ila_net *ilan = net_generic(net, ila_net_id); | |
442 | struct sk_buff *msg; | |
351596aa | 443 | struct ila_xlat_params xp; |
7f00feaf TH |
444 | struct ila_map *ila; |
445 | int ret; | |
446 | ||
351596aa | 447 | ret = parse_nl_config(info, &xp); |
7f00feaf TH |
448 | if (ret) |
449 | return ret; | |
450 | ||
451 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
452 | if (!msg) | |
453 | return -ENOMEM; | |
454 | ||
455 | rcu_read_lock(); | |
456 | ||
351596aa | 457 | ila = ila_lookup_by_params(&xp, ilan); |
7f00feaf TH |
458 | if (ila) { |
459 | ret = ila_dump_info(ila, | |
460 | info->snd_portid, | |
461 | info->snd_seq, 0, msg, | |
462 | info->genlhdr->cmd); | |
463 | } | |
464 | ||
465 | rcu_read_unlock(); | |
466 | ||
467 | if (ret < 0) | |
468 | goto out_free; | |
469 | ||
470 | return genlmsg_reply(msg, info); | |
471 | ||
472 | out_free: | |
473 | nlmsg_free(msg); | |
474 | return ret; | |
475 | } | |
476 | ||
477 | struct ila_dump_iter { | |
478 | struct rhashtable_iter rhiter; | |
479 | }; | |
480 | ||
481 | static int ila_nl_dump_start(struct netlink_callback *cb) | |
482 | { | |
483 | struct net *net = sock_net(cb->skb->sk); | |
484 | struct ila_net *ilan = net_generic(net, ila_net_id); | |
485 | struct ila_dump_iter *iter = (struct ila_dump_iter *)cb->args; | |
486 | ||
8f6fd83c BC |
487 | return rhashtable_walk_init(&ilan->rhash_table, &iter->rhiter, |
488 | GFP_KERNEL); | |
7f00feaf TH |
489 | } |
490 | ||
491 | static int ila_nl_dump_done(struct netlink_callback *cb) | |
492 | { | |
493 | struct ila_dump_iter *iter = (struct ila_dump_iter *)cb->args; | |
494 | ||
495 | rhashtable_walk_exit(&iter->rhiter); | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | static int ila_nl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
501 | { | |
502 | struct ila_dump_iter *iter = (struct ila_dump_iter *)cb->args; | |
503 | struct rhashtable_iter *rhiter = &iter->rhiter; | |
504 | struct ila_map *ila; | |
505 | int ret; | |
506 | ||
507 | ret = rhashtable_walk_start(rhiter); | |
508 | if (ret && ret != -EAGAIN) | |
509 | goto done; | |
510 | ||
511 | for (;;) { | |
512 | ila = rhashtable_walk_next(rhiter); | |
513 | ||
514 | if (IS_ERR(ila)) { | |
515 | if (PTR_ERR(ila) == -EAGAIN) | |
516 | continue; | |
517 | ret = PTR_ERR(ila); | |
518 | goto done; | |
519 | } else if (!ila) { | |
520 | break; | |
521 | } | |
522 | ||
523 | while (ila) { | |
524 | ret = ila_dump_info(ila, NETLINK_CB(cb->skb).portid, | |
525 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
526 | skb, ILA_CMD_GET); | |
527 | if (ret) | |
528 | goto done; | |
529 | ||
530 | ila = rcu_access_pointer(ila->next); | |
531 | } | |
532 | } | |
533 | ||
534 | ret = skb->len; | |
535 | ||
536 | done: | |
537 | rhashtable_walk_stop(rhiter); | |
538 | return ret; | |
539 | } | |
540 | ||
541 | static const struct genl_ops ila_nl_ops[] = { | |
542 | { | |
543 | .cmd = ILA_CMD_ADD, | |
544 | .doit = ila_nl_cmd_add_mapping, | |
545 | .policy = ila_nl_policy, | |
546 | .flags = GENL_ADMIN_PERM, | |
547 | }, | |
548 | { | |
549 | .cmd = ILA_CMD_DEL, | |
550 | .doit = ila_nl_cmd_del_mapping, | |
551 | .policy = ila_nl_policy, | |
552 | .flags = GENL_ADMIN_PERM, | |
553 | }, | |
554 | { | |
555 | .cmd = ILA_CMD_GET, | |
556 | .doit = ila_nl_cmd_get_mapping, | |
557 | .start = ila_nl_dump_start, | |
558 | .dumpit = ila_nl_dump, | |
559 | .done = ila_nl_dump_done, | |
560 | .policy = ila_nl_policy, | |
561 | }, | |
562 | }; | |
563 | ||
564 | #define ILA_HASH_TABLE_SIZE 1024 | |
565 | ||
566 | static __net_init int ila_init_net(struct net *net) | |
567 | { | |
568 | int err; | |
569 | struct ila_net *ilan = net_generic(net, ila_net_id); | |
570 | ||
571 | err = alloc_ila_locks(ilan); | |
572 | if (err) | |
573 | return err; | |
574 | ||
575 | rhashtable_init(&ilan->rhash_table, &rht_params); | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
580 | static __net_exit void ila_exit_net(struct net *net) | |
581 | { | |
582 | struct ila_net *ilan = net_generic(net, ila_net_id); | |
583 | ||
584 | rhashtable_free_and_destroy(&ilan->rhash_table, ila_free_cb, NULL); | |
585 | ||
586 | kvfree(ilan->locks); | |
587 | ||
588 | if (ilan->hooks_registered) | |
589 | nf_unregister_net_hooks(net, ila_nf_hook_ops, | |
590 | ARRAY_SIZE(ila_nf_hook_ops)); | |
591 | } | |
592 | ||
593 | static struct pernet_operations ila_net_ops = { | |
594 | .init = ila_init_net, | |
595 | .exit = ila_exit_net, | |
596 | .id = &ila_net_id, | |
597 | .size = sizeof(struct ila_net), | |
598 | }; | |
599 | ||
707a2ca4 | 600 | static int ila_xlat_addr(struct sk_buff *skb, bool set_csum_neutral) |
7f00feaf TH |
601 | { |
602 | struct ila_map *ila; | |
603 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
604 | struct net *net = dev_net(skb->dev); | |
605 | struct ila_net *ilan = net_generic(net, ila_net_id); | |
351596aa | 606 | struct ila_addr *iaddr = ila_a2i(&ip6h->daddr); |
7f00feaf TH |
607 | |
608 | /* Assumes skb contains a valid IPv6 header that is pulled */ | |
609 | ||
642c2c95 TH |
610 | if (!ila_addr_is_ila(iaddr)) { |
611 | /* Type indicates this is not an ILA address */ | |
612 | return 0; | |
613 | } | |
7f00feaf TH |
614 | |
615 | rcu_read_lock(); | |
616 | ||
642c2c95 | 617 | ila = ila_lookup_wildcards(iaddr, skb->dev->ifindex, ilan); |
7f00feaf | 618 | if (ila) |
707a2ca4 | 619 | ila_update_ipv6_locator(skb, &ila->xp.ip, set_csum_neutral); |
7f00feaf TH |
620 | |
621 | rcu_read_unlock(); | |
622 | ||
623 | return 0; | |
624 | } | |
625 | ||
7f00feaf TH |
626 | int ila_xlat_init(void) |
627 | { | |
628 | int ret; | |
629 | ||
630 | ret = register_pernet_device(&ila_net_ops); | |
631 | if (ret) | |
632 | goto exit; | |
633 | ||
634 | ret = genl_register_family_with_ops(&ila_nl_family, | |
635 | ila_nl_ops); | |
636 | if (ret < 0) | |
637 | goto unregister; | |
638 | ||
639 | return 0; | |
640 | ||
641 | unregister: | |
642 | unregister_pernet_device(&ila_net_ops); | |
643 | exit: | |
644 | return ret; | |
645 | } | |
646 | ||
647 | void ila_xlat_fini(void) | |
648 | { | |
649 | genl_unregister_family(&ila_nl_family); | |
650 | unregister_pernet_device(&ila_net_ops); | |
651 | } |