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1 | // SPDX-License-Identifier: GPL-2.0 | |
2 | #include <linux/jhash.h> | |
3 | #include <linux/netfilter.h> | |
4 | #include <linux/rcupdate.h> | |
5 | #include <linux/rhashtable.h> | |
6 | #include <linux/vmalloc.h> | |
7 | #include <net/genetlink.h> | |
8 | #include <net/ila.h> | |
9 | #include <net/netns/generic.h> | |
10 | #include <uapi/linux/genetlink.h> | |
11 | #include "ila.h" | |
12 | ||
13 | struct ila_xlat_params { | |
14 | struct ila_params ip; | |
15 | int ifindex; | |
16 | }; | |
17 | ||
18 | struct ila_map { | |
19 | struct ila_xlat_params xp; | |
20 | struct rhash_head node; | |
21 | struct ila_map __rcu *next; | |
22 | struct rcu_head rcu; | |
23 | }; | |
24 | ||
25 | static unsigned int ila_net_id; | |
26 | ||
27 | struct ila_net { | |
28 | struct rhashtable rhash_table; | |
29 | spinlock_t *locks; /* Bucket locks for entry manipulation */ | |
30 | unsigned int locks_mask; | |
31 | bool hooks_registered; | |
32 | }; | |
33 | ||
34 | #define LOCKS_PER_CPU 10 | |
35 | ||
36 | static int alloc_ila_locks(struct ila_net *ilan) | |
37 | { | |
38 | unsigned int i, size; | |
39 | unsigned int nr_pcpus = num_possible_cpus(); | |
40 | ||
41 | nr_pcpus = min_t(unsigned int, nr_pcpus, 32UL); | |
42 | size = roundup_pow_of_two(nr_pcpus * LOCKS_PER_CPU); | |
43 | ||
44 | if (sizeof(spinlock_t) != 0) { | |
45 | ilan->locks = kvmalloc(size * sizeof(spinlock_t), GFP_KERNEL); | |
46 | if (!ilan->locks) | |
47 | return -ENOMEM; | |
48 | for (i = 0; i < size; i++) | |
49 | spin_lock_init(&ilan->locks[i]); | |
50 | } | |
51 | ilan->locks_mask = size - 1; | |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
56 | static u32 hashrnd __read_mostly; | |
57 | static __always_inline void __ila_hash_secret_init(void) | |
58 | { | |
59 | net_get_random_once(&hashrnd, sizeof(hashrnd)); | |
60 | } | |
61 | ||
62 | static inline u32 ila_locator_hash(struct ila_locator loc) | |
63 | { | |
64 | u32 *v = (u32 *)loc.v32; | |
65 | ||
66 | __ila_hash_secret_init(); | |
67 | return jhash_2words(v[0], v[1], hashrnd); | |
68 | } | |
69 | ||
70 | static inline spinlock_t *ila_get_lock(struct ila_net *ilan, | |
71 | struct ila_locator loc) | |
72 | { | |
73 | return &ilan->locks[ila_locator_hash(loc) & ilan->locks_mask]; | |
74 | } | |
75 | ||
76 | static inline int ila_cmp_wildcards(struct ila_map *ila, | |
77 | struct ila_addr *iaddr, int ifindex) | |
78 | { | |
79 | return (ila->xp.ifindex && ila->xp.ifindex != ifindex); | |
80 | } | |
81 | ||
82 | static inline int ila_cmp_params(struct ila_map *ila, | |
83 | struct ila_xlat_params *xp) | |
84 | { | |
85 | return (ila->xp.ifindex != xp->ifindex); | |
86 | } | |
87 | ||
88 | static int ila_cmpfn(struct rhashtable_compare_arg *arg, | |
89 | const void *obj) | |
90 | { | |
91 | const struct ila_map *ila = obj; | |
92 | ||
93 | return (ila->xp.ip.locator_match.v64 != *(__be64 *)arg->key); | |
94 | } | |
95 | ||
96 | static inline int ila_order(struct ila_map *ila) | |
97 | { | |
98 | int score = 0; | |
99 | ||
100 | if (ila->xp.ifindex) | |
101 | score += 1 << 1; | |
102 | ||
103 | return score; | |
104 | } | |
105 | ||
106 | static const struct rhashtable_params rht_params = { | |
107 | .nelem_hint = 1024, | |
108 | .head_offset = offsetof(struct ila_map, node), | |
109 | .key_offset = offsetof(struct ila_map, xp.ip.locator_match), | |
110 | .key_len = sizeof(u64), /* identifier */ | |
111 | .max_size = 1048576, | |
112 | .min_size = 256, | |
113 | .automatic_shrinking = true, | |
114 | .obj_cmpfn = ila_cmpfn, | |
115 | }; | |
116 | ||
117 | static struct genl_family ila_nl_family; | |
118 | ||
119 | static const struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = { | |
120 | [ILA_ATTR_LOCATOR] = { .type = NLA_U64, }, | |
121 | [ILA_ATTR_LOCATOR_MATCH] = { .type = NLA_U64, }, | |
122 | [ILA_ATTR_IFINDEX] = { .type = NLA_U32, }, | |
123 | [ILA_ATTR_CSUM_MODE] = { .type = NLA_U8, }, | |
124 | }; | |
125 | ||
126 | static int parse_nl_config(struct genl_info *info, | |
127 | struct ila_xlat_params *xp) | |
128 | { | |
129 | memset(xp, 0, sizeof(*xp)); | |
130 | ||
131 | if (info->attrs[ILA_ATTR_LOCATOR]) | |
132 | xp->ip.locator.v64 = (__force __be64)nla_get_u64( | |
133 | info->attrs[ILA_ATTR_LOCATOR]); | |
134 | ||
135 | if (info->attrs[ILA_ATTR_LOCATOR_MATCH]) | |
136 | xp->ip.locator_match.v64 = (__force __be64)nla_get_u64( | |
137 | info->attrs[ILA_ATTR_LOCATOR_MATCH]); | |
138 | ||
139 | if (info->attrs[ILA_ATTR_CSUM_MODE]) | |
140 | xp->ip.csum_mode = nla_get_u8(info->attrs[ILA_ATTR_CSUM_MODE]); | |
141 | ||
142 | if (info->attrs[ILA_ATTR_IFINDEX]) | |
143 | xp->ifindex = nla_get_s32(info->attrs[ILA_ATTR_IFINDEX]); | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | /* Must be called with rcu readlock */ | |
149 | static inline struct ila_map *ila_lookup_wildcards(struct ila_addr *iaddr, | |
150 | int ifindex, | |
151 | struct ila_net *ilan) | |
152 | { | |
153 | struct ila_map *ila; | |
154 | ||
155 | ila = rhashtable_lookup_fast(&ilan->rhash_table, &iaddr->loc, | |
156 | rht_params); | |
157 | while (ila) { | |
158 | if (!ila_cmp_wildcards(ila, iaddr, ifindex)) | |
159 | return ila; | |
160 | ila = rcu_access_pointer(ila->next); | |
161 | } | |
162 | ||
163 | return NULL; | |
164 | } | |
165 | ||
166 | /* Must be called with rcu readlock */ | |
167 | static inline struct ila_map *ila_lookup_by_params(struct ila_xlat_params *xp, | |
168 | struct ila_net *ilan) | |
169 | { | |
170 | struct ila_map *ila; | |
171 | ||
172 | ila = rhashtable_lookup_fast(&ilan->rhash_table, | |
173 | &xp->ip.locator_match, | |
174 | rht_params); | |
175 | while (ila) { | |
176 | if (!ila_cmp_params(ila, xp)) | |
177 | return ila; | |
178 | ila = rcu_access_pointer(ila->next); | |
179 | } | |
180 | ||
181 | return NULL; | |
182 | } | |
183 | ||
184 | static inline void ila_release(struct ila_map *ila) | |
185 | { | |
186 | kfree_rcu(ila, rcu); | |
187 | } | |
188 | ||
189 | static void ila_free_cb(void *ptr, void *arg) | |
190 | { | |
191 | struct ila_map *ila = (struct ila_map *)ptr, *next; | |
192 | ||
193 | /* Assume rcu_readlock held */ | |
194 | while (ila) { | |
195 | next = rcu_access_pointer(ila->next); | |
196 | ila_release(ila); | |
197 | ila = next; | |
198 | } | |
199 | } | |
200 | ||
201 | static int ila_xlat_addr(struct sk_buff *skb, bool set_csum_neutral); | |
202 | ||
203 | static unsigned int | |
204 | ila_nf_input(void *priv, | |
205 | struct sk_buff *skb, | |
206 | const struct nf_hook_state *state) | |
207 | { | |
208 | ila_xlat_addr(skb, false); | |
209 | return NF_ACCEPT; | |
210 | } | |
211 | ||
212 | static const struct nf_hook_ops ila_nf_hook_ops[] = { | |
213 | { | |
214 | .hook = ila_nf_input, | |
215 | .pf = NFPROTO_IPV6, | |
216 | .hooknum = NF_INET_PRE_ROUTING, | |
217 | .priority = -1, | |
218 | }, | |
219 | }; | |
220 | ||
221 | static int ila_add_mapping(struct net *net, struct ila_xlat_params *xp) | |
222 | { | |
223 | struct ila_net *ilan = net_generic(net, ila_net_id); | |
224 | struct ila_map *ila, *head; | |
225 | spinlock_t *lock = ila_get_lock(ilan, xp->ip.locator_match); | |
226 | int err = 0, order; | |
227 | ||
228 | if (!ilan->hooks_registered) { | |
229 | /* We defer registering net hooks in the namespace until the | |
230 | * first mapping is added. | |
231 | */ | |
232 | err = nf_register_net_hooks(net, ila_nf_hook_ops, | |
233 | ARRAY_SIZE(ila_nf_hook_ops)); | |
234 | if (err) | |
235 | return err; | |
236 | ||
237 | ilan->hooks_registered = true; | |
238 | } | |
239 | ||
240 | ila = kzalloc(sizeof(*ila), GFP_KERNEL); | |
241 | if (!ila) | |
242 | return -ENOMEM; | |
243 | ||
244 | ila_init_saved_csum(&xp->ip); | |
245 | ||
246 | ila->xp = *xp; | |
247 | ||
248 | order = ila_order(ila); | |
249 | ||
250 | spin_lock(lock); | |
251 | ||
252 | head = rhashtable_lookup_fast(&ilan->rhash_table, | |
253 | &xp->ip.locator_match, | |
254 | rht_params); | |
255 | if (!head) { | |
256 | /* New entry for the rhash_table */ | |
257 | err = rhashtable_lookup_insert_fast(&ilan->rhash_table, | |
258 | &ila->node, rht_params); | |
259 | } else { | |
260 | struct ila_map *tila = head, *prev = NULL; | |
261 | ||
262 | do { | |
263 | if (!ila_cmp_params(tila, xp)) { | |
264 | err = -EEXIST; | |
265 | goto out; | |
266 | } | |
267 | ||
268 | if (order > ila_order(tila)) | |
269 | break; | |
270 | ||
271 | prev = tila; | |
272 | tila = rcu_dereference_protected(tila->next, | |
273 | lockdep_is_held(lock)); | |
274 | } while (tila); | |
275 | ||
276 | if (prev) { | |
277 | /* Insert in sub list of head */ | |
278 | RCU_INIT_POINTER(ila->next, tila); | |
279 | rcu_assign_pointer(prev->next, ila); | |
280 | } else { | |
281 | /* Make this ila new head */ | |
282 | RCU_INIT_POINTER(ila->next, head); | |
283 | err = rhashtable_replace_fast(&ilan->rhash_table, | |
284 | &head->node, | |
285 | &ila->node, rht_params); | |
286 | if (err) | |
287 | goto out; | |
288 | } | |
289 | } | |
290 | ||
291 | out: | |
292 | spin_unlock(lock); | |
293 | ||
294 | if (err) | |
295 | kfree(ila); | |
296 | ||
297 | return err; | |
298 | } | |
299 | ||
300 | static int ila_del_mapping(struct net *net, struct ila_xlat_params *xp) | |
301 | { | |
302 | struct ila_net *ilan = net_generic(net, ila_net_id); | |
303 | struct ila_map *ila, *head, *prev; | |
304 | spinlock_t *lock = ila_get_lock(ilan, xp->ip.locator_match); | |
305 | int err = -ENOENT; | |
306 | ||
307 | spin_lock(lock); | |
308 | ||
309 | head = rhashtable_lookup_fast(&ilan->rhash_table, | |
310 | &xp->ip.locator_match, rht_params); | |
311 | ila = head; | |
312 | ||
313 | prev = NULL; | |
314 | ||
315 | while (ila) { | |
316 | if (ila_cmp_params(ila, xp)) { | |
317 | prev = ila; | |
318 | ila = rcu_dereference_protected(ila->next, | |
319 | lockdep_is_held(lock)); | |
320 | continue; | |
321 | } | |
322 | ||
323 | err = 0; | |
324 | ||
325 | if (prev) { | |
326 | /* Not head, just delete from list */ | |
327 | rcu_assign_pointer(prev->next, ila->next); | |
328 | } else { | |
329 | /* It is the head. If there is something in the | |
330 | * sublist we need to make a new head. | |
331 | */ | |
332 | head = rcu_dereference_protected(ila->next, | |
333 | lockdep_is_held(lock)); | |
334 | if (head) { | |
335 | /* Put first entry in the sublist into the | |
336 | * table | |
337 | */ | |
338 | err = rhashtable_replace_fast( | |
339 | &ilan->rhash_table, &ila->node, | |
340 | &head->node, rht_params); | |
341 | if (err) | |
342 | goto out; | |
343 | } else { | |
344 | /* Entry no longer used */ | |
345 | err = rhashtable_remove_fast(&ilan->rhash_table, | |
346 | &ila->node, | |
347 | rht_params); | |
348 | } | |
349 | } | |
350 | ||
351 | ila_release(ila); | |
352 | ||
353 | break; | |
354 | } | |
355 | ||
356 | out: | |
357 | spin_unlock(lock); | |
358 | ||
359 | return err; | |
360 | } | |
361 | ||
362 | static int ila_nl_cmd_add_mapping(struct sk_buff *skb, struct genl_info *info) | |
363 | { | |
364 | struct net *net = genl_info_net(info); | |
365 | struct ila_xlat_params p; | |
366 | int err; | |
367 | ||
368 | err = parse_nl_config(info, &p); | |
369 | if (err) | |
370 | return err; | |
371 | ||
372 | return ila_add_mapping(net, &p); | |
373 | } | |
374 | ||
375 | static int ila_nl_cmd_del_mapping(struct sk_buff *skb, struct genl_info *info) | |
376 | { | |
377 | struct net *net = genl_info_net(info); | |
378 | struct ila_xlat_params xp; | |
379 | int err; | |
380 | ||
381 | err = parse_nl_config(info, &xp); | |
382 | if (err) | |
383 | return err; | |
384 | ||
385 | ila_del_mapping(net, &xp); | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | static int ila_fill_info(struct ila_map *ila, struct sk_buff *msg) | |
391 | { | |
392 | if (nla_put_u64_64bit(msg, ILA_ATTR_LOCATOR, | |
393 | (__force u64)ila->xp.ip.locator.v64, | |
394 | ILA_ATTR_PAD) || | |
395 | nla_put_u64_64bit(msg, ILA_ATTR_LOCATOR_MATCH, | |
396 | (__force u64)ila->xp.ip.locator_match.v64, | |
397 | ILA_ATTR_PAD) || | |
398 | nla_put_s32(msg, ILA_ATTR_IFINDEX, ila->xp.ifindex) || | |
399 | nla_put_u32(msg, ILA_ATTR_CSUM_MODE, ila->xp.ip.csum_mode)) | |
400 | return -1; | |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
405 | static int ila_dump_info(struct ila_map *ila, | |
406 | u32 portid, u32 seq, u32 flags, | |
407 | struct sk_buff *skb, u8 cmd) | |
408 | { | |
409 | void *hdr; | |
410 | ||
411 | hdr = genlmsg_put(skb, portid, seq, &ila_nl_family, flags, cmd); | |
412 | if (!hdr) | |
413 | return -ENOMEM; | |
414 | ||
415 | if (ila_fill_info(ila, skb) < 0) | |
416 | goto nla_put_failure; | |
417 | ||
418 | genlmsg_end(skb, hdr); | |
419 | return 0; | |
420 | ||
421 | nla_put_failure: | |
422 | genlmsg_cancel(skb, hdr); | |
423 | return -EMSGSIZE; | |
424 | } | |
425 | ||
426 | static int ila_nl_cmd_get_mapping(struct sk_buff *skb, struct genl_info *info) | |
427 | { | |
428 | struct net *net = genl_info_net(info); | |
429 | struct ila_net *ilan = net_generic(net, ila_net_id); | |
430 | struct sk_buff *msg; | |
431 | struct ila_xlat_params xp; | |
432 | struct ila_map *ila; | |
433 | int ret; | |
434 | ||
435 | ret = parse_nl_config(info, &xp); | |
436 | if (ret) | |
437 | return ret; | |
438 | ||
439 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
440 | if (!msg) | |
441 | return -ENOMEM; | |
442 | ||
443 | rcu_read_lock(); | |
444 | ||
445 | ila = ila_lookup_by_params(&xp, ilan); | |
446 | if (ila) { | |
447 | ret = ila_dump_info(ila, | |
448 | info->snd_portid, | |
449 | info->snd_seq, 0, msg, | |
450 | info->genlhdr->cmd); | |
451 | } | |
452 | ||
453 | rcu_read_unlock(); | |
454 | ||
455 | if (ret < 0) | |
456 | goto out_free; | |
457 | ||
458 | return genlmsg_reply(msg, info); | |
459 | ||
460 | out_free: | |
461 | nlmsg_free(msg); | |
462 | return ret; | |
463 | } | |
464 | ||
465 | struct ila_dump_iter { | |
466 | struct rhashtable_iter rhiter; | |
467 | }; | |
468 | ||
469 | static int ila_nl_dump_start(struct netlink_callback *cb) | |
470 | { | |
471 | struct net *net = sock_net(cb->skb->sk); | |
472 | struct ila_net *ilan = net_generic(net, ila_net_id); | |
473 | struct ila_dump_iter *iter = (struct ila_dump_iter *)cb->args[0]; | |
474 | ||
475 | if (!iter) { | |
476 | iter = kmalloc(sizeof(*iter), GFP_KERNEL); | |
477 | if (!iter) | |
478 | return -ENOMEM; | |
479 | ||
480 | cb->args[0] = (long)iter; | |
481 | } | |
482 | ||
483 | return rhashtable_walk_init(&ilan->rhash_table, &iter->rhiter, | |
484 | GFP_KERNEL); | |
485 | } | |
486 | ||
487 | static int ila_nl_dump_done(struct netlink_callback *cb) | |
488 | { | |
489 | struct ila_dump_iter *iter = (struct ila_dump_iter *)cb->args[0]; | |
490 | ||
491 | rhashtable_walk_exit(&iter->rhiter); | |
492 | ||
493 | kfree(iter); | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | static int ila_nl_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
499 | { | |
500 | struct ila_dump_iter *iter = (struct ila_dump_iter *)cb->args[0]; | |
501 | struct rhashtable_iter *rhiter = &iter->rhiter; | |
502 | struct ila_map *ila; | |
503 | int ret; | |
504 | ||
505 | ret = rhashtable_walk_start(rhiter); | |
506 | if (ret && ret != -EAGAIN) | |
507 | goto done; | |
508 | ||
509 | for (;;) { | |
510 | ila = rhashtable_walk_next(rhiter); | |
511 | ||
512 | if (IS_ERR(ila)) { | |
513 | if (PTR_ERR(ila) == -EAGAIN) | |
514 | continue; | |
515 | ret = PTR_ERR(ila); | |
516 | goto done; | |
517 | } else if (!ila) { | |
518 | break; | |
519 | } | |
520 | ||
521 | while (ila) { | |
522 | ret = ila_dump_info(ila, NETLINK_CB(cb->skb).portid, | |
523 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
524 | skb, ILA_CMD_GET); | |
525 | if (ret) | |
526 | goto done; | |
527 | ||
528 | ila = rcu_access_pointer(ila->next); | |
529 | } | |
530 | } | |
531 | ||
532 | ret = skb->len; | |
533 | ||
534 | done: | |
535 | rhashtable_walk_stop(rhiter); | |
536 | return ret; | |
537 | } | |
538 | ||
539 | static const struct genl_ops ila_nl_ops[] = { | |
540 | { | |
541 | .cmd = ILA_CMD_ADD, | |
542 | .doit = ila_nl_cmd_add_mapping, | |
543 | .policy = ila_nl_policy, | |
544 | .flags = GENL_ADMIN_PERM, | |
545 | }, | |
546 | { | |
547 | .cmd = ILA_CMD_DEL, | |
548 | .doit = ila_nl_cmd_del_mapping, | |
549 | .policy = ila_nl_policy, | |
550 | .flags = GENL_ADMIN_PERM, | |
551 | }, | |
552 | { | |
553 | .cmd = ILA_CMD_GET, | |
554 | .doit = ila_nl_cmd_get_mapping, | |
555 | .start = ila_nl_dump_start, | |
556 | .dumpit = ila_nl_dump, | |
557 | .done = ila_nl_dump_done, | |
558 | .policy = ila_nl_policy, | |
559 | }, | |
560 | }; | |
561 | ||
562 | static struct genl_family ila_nl_family __ro_after_init = { | |
563 | .hdrsize = 0, | |
564 | .name = ILA_GENL_NAME, | |
565 | .version = ILA_GENL_VERSION, | |
566 | .maxattr = ILA_ATTR_MAX, | |
567 | .netnsok = true, | |
568 | .parallel_ops = true, | |
569 | .module = THIS_MODULE, | |
570 | .ops = ila_nl_ops, | |
571 | .n_ops = ARRAY_SIZE(ila_nl_ops), | |
572 | }; | |
573 | ||
574 | #define ILA_HASH_TABLE_SIZE 1024 | |
575 | ||
576 | static __net_init int ila_init_net(struct net *net) | |
577 | { | |
578 | int err; | |
579 | struct ila_net *ilan = net_generic(net, ila_net_id); | |
580 | ||
581 | err = alloc_ila_locks(ilan); | |
582 | if (err) | |
583 | return err; | |
584 | ||
585 | rhashtable_init(&ilan->rhash_table, &rht_params); | |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
590 | static __net_exit void ila_exit_net(struct net *net) | |
591 | { | |
592 | struct ila_net *ilan = net_generic(net, ila_net_id); | |
593 | ||
594 | rhashtable_free_and_destroy(&ilan->rhash_table, ila_free_cb, NULL); | |
595 | ||
596 | kvfree(ilan->locks); | |
597 | ||
598 | if (ilan->hooks_registered) | |
599 | nf_unregister_net_hooks(net, ila_nf_hook_ops, | |
600 | ARRAY_SIZE(ila_nf_hook_ops)); | |
601 | } | |
602 | ||
603 | static struct pernet_operations ila_net_ops = { | |
604 | .init = ila_init_net, | |
605 | .exit = ila_exit_net, | |
606 | .id = &ila_net_id, | |
607 | .size = sizeof(struct ila_net), | |
608 | }; | |
609 | ||
610 | static int ila_xlat_addr(struct sk_buff *skb, bool set_csum_neutral) | |
611 | { | |
612 | struct ila_map *ila; | |
613 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
614 | struct net *net = dev_net(skb->dev); | |
615 | struct ila_net *ilan = net_generic(net, ila_net_id); | |
616 | struct ila_addr *iaddr = ila_a2i(&ip6h->daddr); | |
617 | ||
618 | /* Assumes skb contains a valid IPv6 header that is pulled */ | |
619 | ||
620 | if (!ila_addr_is_ila(iaddr)) { | |
621 | /* Type indicates this is not an ILA address */ | |
622 | return 0; | |
623 | } | |
624 | ||
625 | rcu_read_lock(); | |
626 | ||
627 | ila = ila_lookup_wildcards(iaddr, skb->dev->ifindex, ilan); | |
628 | if (ila) | |
629 | ila_update_ipv6_locator(skb, &ila->xp.ip, set_csum_neutral); | |
630 | ||
631 | rcu_read_unlock(); | |
632 | ||
633 | return 0; | |
634 | } | |
635 | ||
636 | int __init ila_xlat_init(void) | |
637 | { | |
638 | int ret; | |
639 | ||
640 | ret = register_pernet_device(&ila_net_ops); | |
641 | if (ret) | |
642 | goto exit; | |
643 | ||
644 | ret = genl_register_family(&ila_nl_family); | |
645 | if (ret < 0) | |
646 | goto unregister; | |
647 | ||
648 | return 0; | |
649 | ||
650 | unregister: | |
651 | unregister_pernet_device(&ila_net_ops); | |
652 | exit: | |
653 | return ret; | |
654 | } | |
655 | ||
656 | void ila_xlat_fini(void) | |
657 | { | |
658 | genl_unregister_family(&ila_nl_family); | |
659 | unregister_pernet_device(&ila_net_ops); | |
660 | } |