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Commit | Line | Data |
---|---|---|
a716c119 | 1 | /* |
1da177e4 LT |
2 | * xfrm_policy.c |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * Kazunori MIYAZAWA @USAGI | |
10 | * YOSHIFUJI Hideaki | |
11 | * Split up af-specific portion | |
12 | * Derek Atkins <derek@ihtfp.com> Add the post_input processor | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
66cdb3ca | 16 | #include <linux/err.h> |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/kmod.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/workqueue.h> | |
22 | #include <linux/notifier.h> | |
23 | #include <linux/netdevice.h> | |
eb9c7ebe | 24 | #include <linux/netfilter.h> |
1da177e4 | 25 | #include <linux/module.h> |
2518c7c2 | 26 | #include <linux/cache.h> |
68277acc | 27 | #include <linux/audit.h> |
25ee3286 | 28 | #include <net/dst.h> |
6ce74ec7 | 29 | #include <net/flow.h> |
1da177e4 LT |
30 | #include <net/xfrm.h> |
31 | #include <net/ip.h> | |
558f82ef MN |
32 | #ifdef CONFIG_XFRM_STATISTICS |
33 | #include <net/snmp.h> | |
34 | #endif | |
1da177e4 | 35 | |
44e36b42 DM |
36 | #include "xfrm_hash.h" |
37 | ||
a0073fe1 SK |
38 | #define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10)) |
39 | #define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ)) | |
40 | #define XFRM_MAX_QUEUE_LEN 100 | |
41 | ||
b8c203b2 SK |
42 | struct xfrm_flo { |
43 | struct dst_entry *dst_orig; | |
44 | u8 flags; | |
45 | }; | |
46 | ||
418a99ac PJ |
47 | static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock); |
48 | static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO] | |
49 | __read_mostly; | |
1da177e4 | 50 | |
e18b890b | 51 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
30846090 | 52 | static __read_mostly seqcount_t xfrm_policy_hash_generation; |
1da177e4 | 53 | |
25ee3286 | 54 | static void xfrm_init_pmtu(struct dst_entry *dst); |
80c802f3 | 55 | static int stale_bundle(struct dst_entry *dst); |
12fdb4d3 | 56 | static int xfrm_bundle_ok(struct xfrm_dst *xdst); |
a0073fe1 | 57 | static void xfrm_policy_queue_process(unsigned long arg); |
1da177e4 | 58 | |
12bfa8bd | 59 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir); |
29fa0b30 WY |
60 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
61 | int dir); | |
62 | ||
e37cc8ad FW |
63 | static inline bool xfrm_pol_hold_rcu(struct xfrm_policy *policy) |
64 | { | |
65 | return atomic_inc_not_zero(&policy->refcnt); | |
66 | } | |
67 | ||
bc9b35ad | 68 | static inline bool |
200ce96e | 69 | __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 70 | { |
7e1dc7b6 DM |
71 | const struct flowi4 *fl4 = &fl->u.ip4; |
72 | ||
26bff940 AD |
73 | return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) && |
74 | addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) && | |
7e1dc7b6 DM |
75 | !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) && |
76 | !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) && | |
77 | (fl4->flowi4_proto == sel->proto || !sel->proto) && | |
78 | (fl4->flowi4_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
79 | } |
80 | ||
bc9b35ad | 81 | static inline bool |
200ce96e | 82 | __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 83 | { |
7e1dc7b6 DM |
84 | const struct flowi6 *fl6 = &fl->u.ip6; |
85 | ||
86 | return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) && | |
87 | addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) && | |
88 | !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) && | |
89 | !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) && | |
90 | (fl6->flowi6_proto == sel->proto || !sel->proto) && | |
91 | (fl6->flowi6_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
92 | } |
93 | ||
bc9b35ad DM |
94 | bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl, |
95 | unsigned short family) | |
77681021 AM |
96 | { |
97 | switch (family) { | |
98 | case AF_INET: | |
99 | return __xfrm4_selector_match(sel, fl); | |
100 | case AF_INET6: | |
101 | return __xfrm6_selector_match(sel, fl); | |
102 | } | |
bc9b35ad | 103 | return false; |
77681021 AM |
104 | } |
105 | ||
ef8531b6 ED |
106 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
107 | { | |
108 | struct xfrm_policy_afinfo *afinfo; | |
109 | ||
110 | if (unlikely(family >= NPROTO)) | |
111 | return NULL; | |
112 | rcu_read_lock(); | |
113 | afinfo = rcu_dereference(xfrm_policy_afinfo[family]); | |
114 | if (unlikely(!afinfo)) | |
115 | rcu_read_unlock(); | |
116 | return afinfo; | |
117 | } | |
118 | ||
119 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
120 | { | |
121 | rcu_read_unlock(); | |
122 | } | |
123 | ||
42a7b32b DA |
124 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, |
125 | int tos, int oif, | |
6418c4e0 DM |
126 | const xfrm_address_t *saddr, |
127 | const xfrm_address_t *daddr, | |
9bb182a7 YH |
128 | int family) |
129 | { | |
130 | struct xfrm_policy_afinfo *afinfo; | |
131 | struct dst_entry *dst; | |
132 | ||
133 | afinfo = xfrm_policy_get_afinfo(family); | |
134 | if (unlikely(afinfo == NULL)) | |
135 | return ERR_PTR(-EAFNOSUPPORT); | |
136 | ||
42a7b32b | 137 | dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr); |
9bb182a7 YH |
138 | |
139 | xfrm_policy_put_afinfo(afinfo); | |
140 | ||
141 | return dst; | |
142 | } | |
143 | ||
42a7b32b DA |
144 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, |
145 | int tos, int oif, | |
9bb182a7 YH |
146 | xfrm_address_t *prev_saddr, |
147 | xfrm_address_t *prev_daddr, | |
25ee3286 | 148 | int family) |
1da177e4 | 149 | { |
c5b3cf46 | 150 | struct net *net = xs_net(x); |
66cdb3ca HX |
151 | xfrm_address_t *saddr = &x->props.saddr; |
152 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
153 | struct dst_entry *dst; |
154 | ||
9bb182a7 | 155 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 156 | saddr = x->coaddr; |
9bb182a7 YH |
157 | daddr = prev_daddr; |
158 | } | |
159 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
160 | saddr = prev_saddr; | |
66cdb3ca | 161 | daddr = x->coaddr; |
9bb182a7 | 162 | } |
1da177e4 | 163 | |
42a7b32b | 164 | dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family); |
9bb182a7 YH |
165 | |
166 | if (!IS_ERR(dst)) { | |
167 | if (prev_saddr != saddr) | |
168 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
169 | if (prev_daddr != daddr) | |
170 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
171 | } | |
1da177e4 | 172 | |
66cdb3ca | 173 | return dst; |
1da177e4 | 174 | } |
1da177e4 | 175 | |
1da177e4 LT |
176 | static inline unsigned long make_jiffies(long secs) |
177 | { | |
178 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
179 | return MAX_SCHEDULE_TIMEOUT-1; | |
180 | else | |
a716c119 | 181 | return secs*HZ; |
1da177e4 LT |
182 | } |
183 | ||
184 | static void xfrm_policy_timer(unsigned long data) | |
185 | { | |
3e94c2dc | 186 | struct xfrm_policy *xp = (struct xfrm_policy *)data; |
9d729f72 | 187 | unsigned long now = get_seconds(); |
1da177e4 LT |
188 | long next = LONG_MAX; |
189 | int warn = 0; | |
190 | int dir; | |
191 | ||
192 | read_lock(&xp->lock); | |
193 | ||
ea2dea9d | 194 | if (unlikely(xp->walk.dead)) |
1da177e4 LT |
195 | goto out; |
196 | ||
77d8d7a6 | 197 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
198 | |
199 | if (xp->lft.hard_add_expires_seconds) { | |
200 | long tmo = xp->lft.hard_add_expires_seconds + | |
201 | xp->curlft.add_time - now; | |
202 | if (tmo <= 0) | |
203 | goto expired; | |
204 | if (tmo < next) | |
205 | next = tmo; | |
206 | } | |
207 | if (xp->lft.hard_use_expires_seconds) { | |
208 | long tmo = xp->lft.hard_use_expires_seconds + | |
209 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
210 | if (tmo <= 0) | |
211 | goto expired; | |
212 | if (tmo < next) | |
213 | next = tmo; | |
214 | } | |
215 | if (xp->lft.soft_add_expires_seconds) { | |
216 | long tmo = xp->lft.soft_add_expires_seconds + | |
217 | xp->curlft.add_time - now; | |
218 | if (tmo <= 0) { | |
219 | warn = 1; | |
220 | tmo = XFRM_KM_TIMEOUT; | |
221 | } | |
222 | if (tmo < next) | |
223 | next = tmo; | |
224 | } | |
225 | if (xp->lft.soft_use_expires_seconds) { | |
226 | long tmo = xp->lft.soft_use_expires_seconds + | |
227 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
228 | if (tmo <= 0) { | |
229 | warn = 1; | |
230 | tmo = XFRM_KM_TIMEOUT; | |
231 | } | |
232 | if (tmo < next) | |
233 | next = tmo; | |
234 | } | |
235 | ||
236 | if (warn) | |
6c5c8ca7 | 237 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
238 | if (next != LONG_MAX && |
239 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
240 | xfrm_pol_hold(xp); | |
241 | ||
242 | out: | |
243 | read_unlock(&xp->lock); | |
244 | xfrm_pol_put(xp); | |
245 | return; | |
246 | ||
247 | expired: | |
248 | read_unlock(&xp->lock); | |
4666faab | 249 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 250 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
251 | xfrm_pol_put(xp); |
252 | } | |
253 | ||
fe1a5f03 TT |
254 | static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo) |
255 | { | |
256 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
257 | ||
258 | if (unlikely(pol->walk.dead)) | |
259 | flo = NULL; | |
260 | else | |
261 | xfrm_pol_hold(pol); | |
262 | ||
263 | return flo; | |
264 | } | |
265 | ||
266 | static int xfrm_policy_flo_check(struct flow_cache_object *flo) | |
267 | { | |
268 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
269 | ||
270 | return !pol->walk.dead; | |
271 | } | |
272 | ||
273 | static void xfrm_policy_flo_delete(struct flow_cache_object *flo) | |
274 | { | |
275 | xfrm_pol_put(container_of(flo, struct xfrm_policy, flo)); | |
276 | } | |
277 | ||
278 | static const struct flow_cache_ops xfrm_policy_fc_ops = { | |
279 | .get = xfrm_policy_flo_get, | |
280 | .check = xfrm_policy_flo_check, | |
281 | .delete = xfrm_policy_flo_delete, | |
282 | }; | |
1da177e4 LT |
283 | |
284 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
285 | * SPD calls. | |
286 | */ | |
287 | ||
0331b1f3 | 288 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
289 | { |
290 | struct xfrm_policy *policy; | |
291 | ||
0da974f4 | 292 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
293 | |
294 | if (policy) { | |
0331b1f3 | 295 | write_pnet(&policy->xp_net, net); |
12a169e7 | 296 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
297 | INIT_HLIST_NODE(&policy->bydst); |
298 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 299 | rwlock_init(&policy->lock); |
2518c7c2 | 300 | atomic_set(&policy->refcnt, 1); |
a0073fe1 | 301 | skb_queue_head_init(&policy->polq.hold_queue); |
b24b8a24 PE |
302 | setup_timer(&policy->timer, xfrm_policy_timer, |
303 | (unsigned long)policy); | |
a0073fe1 SK |
304 | setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process, |
305 | (unsigned long)policy); | |
fe1a5f03 | 306 | policy->flo.ops = &xfrm_policy_fc_ops; |
1da177e4 LT |
307 | } |
308 | return policy; | |
309 | } | |
310 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
311 | ||
56f04730 ED |
312 | static void xfrm_policy_destroy_rcu(struct rcu_head *head) |
313 | { | |
314 | struct xfrm_policy *policy = container_of(head, struct xfrm_policy, rcu); | |
315 | ||
316 | security_xfrm_policy_free(policy->security); | |
317 | kfree(policy); | |
318 | } | |
319 | ||
1da177e4 LT |
320 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ |
321 | ||
64c31b3f | 322 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 323 | { |
12a169e7 | 324 | BUG_ON(!policy->walk.dead); |
1da177e4 | 325 | |
0659eea9 | 326 | if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer)) |
1da177e4 LT |
327 | BUG(); |
328 | ||
56f04730 | 329 | call_rcu(&policy->rcu, xfrm_policy_destroy_rcu); |
1da177e4 | 330 | } |
64c31b3f | 331 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 | 332 | |
1365e547 | 333 | /* Rule must be locked. Release descendant resources, announce |
1da177e4 LT |
334 | * entry dead. The rule must be unlinked from lists to the moment. |
335 | */ | |
336 | ||
337 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
338 | { | |
12a169e7 | 339 | policy->walk.dead = 1; |
1da177e4 | 340 | |
285ead17 | 341 | atomic_inc(&policy->genid); |
1da177e4 | 342 | |
e7d8f6cb SK |
343 | if (del_timer(&policy->polq.hold_timer)) |
344 | xfrm_pol_put(policy); | |
1ee5e667 | 345 | skb_queue_purge(&policy->polq.hold_queue); |
a0073fe1 | 346 | |
285ead17 TT |
347 | if (del_timer(&policy->timer)) |
348 | xfrm_pol_put(policy); | |
349 | ||
350 | xfrm_pol_put(policy); | |
1da177e4 LT |
351 | } |
352 | ||
2518c7c2 DM |
353 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
354 | ||
e92303f8 | 355 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 356 | { |
e92303f8 | 357 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
358 | } |
359 | ||
b58555f1 CG |
360 | /* calculate policy hash thresholds */ |
361 | static void __get_hash_thresh(struct net *net, | |
362 | unsigned short family, int dir, | |
363 | u8 *dbits, u8 *sbits) | |
364 | { | |
365 | switch (family) { | |
366 | case AF_INET: | |
367 | *dbits = net->xfrm.policy_bydst[dir].dbits4; | |
368 | *sbits = net->xfrm.policy_bydst[dir].sbits4; | |
369 | break; | |
370 | ||
371 | case AF_INET6: | |
372 | *dbits = net->xfrm.policy_bydst[dir].dbits6; | |
373 | *sbits = net->xfrm.policy_bydst[dir].sbits6; | |
374 | break; | |
375 | ||
376 | default: | |
377 | *dbits = 0; | |
378 | *sbits = 0; | |
379 | } | |
380 | } | |
381 | ||
5f803b58 DM |
382 | static struct hlist_head *policy_hash_bysel(struct net *net, |
383 | const struct xfrm_selector *sel, | |
384 | unsigned short family, int dir) | |
2518c7c2 | 385 | { |
1121994c | 386 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
b58555f1 CG |
387 | unsigned int hash; |
388 | u8 dbits; | |
389 | u8 sbits; | |
390 | ||
391 | __get_hash_thresh(net, family, dir, &dbits, &sbits); | |
392 | hash = __sel_hash(sel, family, hmask, dbits, sbits); | |
2518c7c2 | 393 | |
e1e551bc FW |
394 | if (hash == hmask + 1) |
395 | return &net->xfrm.policy_inexact[dir]; | |
396 | ||
397 | return rcu_dereference_check(net->xfrm.policy_bydst[dir].table, | |
398 | lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash; | |
2518c7c2 DM |
399 | } |
400 | ||
5f803b58 DM |
401 | static struct hlist_head *policy_hash_direct(struct net *net, |
402 | const xfrm_address_t *daddr, | |
403 | const xfrm_address_t *saddr, | |
404 | unsigned short family, int dir) | |
2518c7c2 | 405 | { |
1121994c | 406 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
b58555f1 CG |
407 | unsigned int hash; |
408 | u8 dbits; | |
409 | u8 sbits; | |
410 | ||
411 | __get_hash_thresh(net, family, dir, &dbits, &sbits); | |
412 | hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits); | |
2518c7c2 | 413 | |
e1e551bc FW |
414 | return rcu_dereference_check(net->xfrm.policy_bydst[dir].table, |
415 | lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash; | |
2518c7c2 DM |
416 | } |
417 | ||
b58555f1 CG |
418 | static void xfrm_dst_hash_transfer(struct net *net, |
419 | struct hlist_head *list, | |
2518c7c2 | 420 | struct hlist_head *ndsttable, |
b58555f1 CG |
421 | unsigned int nhashmask, |
422 | int dir) | |
2518c7c2 | 423 | { |
b67bfe0d | 424 | struct hlist_node *tmp, *entry0 = NULL; |
2518c7c2 | 425 | struct xfrm_policy *pol; |
b791160b | 426 | unsigned int h0 = 0; |
b58555f1 CG |
427 | u8 dbits; |
428 | u8 sbits; | |
2518c7c2 | 429 | |
b791160b | 430 | redo: |
b67bfe0d | 431 | hlist_for_each_entry_safe(pol, tmp, list, bydst) { |
2518c7c2 DM |
432 | unsigned int h; |
433 | ||
b58555f1 | 434 | __get_hash_thresh(net, pol->family, dir, &dbits, &sbits); |
2518c7c2 | 435 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, |
b58555f1 | 436 | pol->family, nhashmask, dbits, sbits); |
b791160b | 437 | if (!entry0) { |
a5eefc1d FW |
438 | hlist_del_rcu(&pol->bydst); |
439 | hlist_add_head_rcu(&pol->bydst, ndsttable + h); | |
b791160b YH |
440 | h0 = h; |
441 | } else { | |
442 | if (h != h0) | |
443 | continue; | |
a5eefc1d FW |
444 | hlist_del_rcu(&pol->bydst); |
445 | hlist_add_behind_rcu(&pol->bydst, entry0); | |
b791160b | 446 | } |
b67bfe0d | 447 | entry0 = &pol->bydst; |
b791160b YH |
448 | } |
449 | if (!hlist_empty(list)) { | |
450 | entry0 = NULL; | |
451 | goto redo; | |
2518c7c2 DM |
452 | } |
453 | } | |
454 | ||
455 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
456 | struct hlist_head *nidxtable, | |
457 | unsigned int nhashmask) | |
458 | { | |
b67bfe0d | 459 | struct hlist_node *tmp; |
2518c7c2 DM |
460 | struct xfrm_policy *pol; |
461 | ||
b67bfe0d | 462 | hlist_for_each_entry_safe(pol, tmp, list, byidx) { |
2518c7c2 DM |
463 | unsigned int h; |
464 | ||
465 | h = __idx_hash(pol->index, nhashmask); | |
466 | hlist_add_head(&pol->byidx, nidxtable+h); | |
467 | } | |
468 | } | |
469 | ||
470 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
471 | { | |
472 | return ((old_hmask + 1) << 1) - 1; | |
473 | } | |
474 | ||
66caf628 | 475 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 476 | { |
66caf628 | 477 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
478 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
479 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 | 480 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
e1e551bc | 481 | struct hlist_head *odst; |
2518c7c2 DM |
482 | int i; |
483 | ||
484 | if (!ndst) | |
485 | return; | |
486 | ||
9d0380df | 487 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
30846090 FW |
488 | write_seqcount_begin(&xfrm_policy_hash_generation); |
489 | ||
490 | odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table, | |
491 | lockdep_is_held(&net->xfrm.xfrm_policy_lock)); | |
2518c7c2 | 492 | |
e1e551bc FW |
493 | odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table, |
494 | lockdep_is_held(&net->xfrm.xfrm_policy_lock)); | |
495 | ||
2518c7c2 | 496 | for (i = hmask; i >= 0; i--) |
b58555f1 | 497 | xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir); |
2518c7c2 | 498 | |
e1e551bc | 499 | rcu_assign_pointer(net->xfrm.policy_bydst[dir].table, ndst); |
66caf628 | 500 | net->xfrm.policy_bydst[dir].hmask = nhashmask; |
2518c7c2 | 501 | |
30846090 | 502 | write_seqcount_end(&xfrm_policy_hash_generation); |
9d0380df | 503 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 | 504 | |
e1e551bc FW |
505 | synchronize_rcu(); |
506 | ||
44e36b42 | 507 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
508 | } |
509 | ||
66caf628 | 510 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 511 | { |
66caf628 | 512 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
513 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
514 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 515 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 516 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
517 | int i; |
518 | ||
519 | if (!nidx) | |
520 | return; | |
521 | ||
9d0380df | 522 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
523 | |
524 | for (i = hmask; i >= 0; i--) | |
525 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
526 | ||
66caf628 AD |
527 | net->xfrm.policy_byidx = nidx; |
528 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 | 529 | |
9d0380df | 530 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 | 531 | |
44e36b42 | 532 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
533 | } |
534 | ||
66caf628 | 535 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 536 | { |
66caf628 AD |
537 | unsigned int cnt = net->xfrm.policy_count[dir]; |
538 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
539 | |
540 | if (total) | |
541 | *total += cnt; | |
542 | ||
543 | if ((hmask + 1) < xfrm_policy_hashmax && | |
544 | cnt > hmask) | |
545 | return 1; | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
66caf628 | 550 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 551 | { |
66caf628 | 552 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
553 | |
554 | if ((hmask + 1) < xfrm_policy_hashmax && | |
555 | total > hmask) | |
556 | return 1; | |
557 | ||
558 | return 0; | |
559 | } | |
560 | ||
e071041b | 561 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 | 562 | { |
e071041b AD |
563 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
564 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
565 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
566 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
567 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
568 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
569 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 | 570 | si->spdhmcnt = xfrm_policy_hashmax; |
ecfd6b18 JHS |
571 | } |
572 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 573 | |
ecfd6b18 | 574 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 575 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 576 | { |
66caf628 | 577 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
578 | int dir, total; |
579 | ||
580 | mutex_lock(&hash_resize_mutex); | |
581 | ||
582 | total = 0; | |
53c2e285 | 583 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
66caf628 AD |
584 | if (xfrm_bydst_should_resize(net, dir, &total)) |
585 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 586 | } |
66caf628 AD |
587 | if (xfrm_byidx_should_resize(net, total)) |
588 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
589 | |
590 | mutex_unlock(&hash_resize_mutex); | |
591 | } | |
592 | ||
880a6fab CG |
593 | static void xfrm_hash_rebuild(struct work_struct *work) |
594 | { | |
595 | struct net *net = container_of(work, struct net, | |
596 | xfrm.policy_hthresh.work); | |
597 | unsigned int hmask; | |
598 | struct xfrm_policy *pol; | |
599 | struct xfrm_policy *policy; | |
600 | struct hlist_head *chain; | |
601 | struct hlist_head *odst; | |
602 | struct hlist_node *newpos; | |
603 | int i; | |
604 | int dir; | |
605 | unsigned seq; | |
606 | u8 lbits4, rbits4, lbits6, rbits6; | |
607 | ||
608 | mutex_lock(&hash_resize_mutex); | |
609 | ||
610 | /* read selector prefixlen thresholds */ | |
611 | do { | |
612 | seq = read_seqbegin(&net->xfrm.policy_hthresh.lock); | |
613 | ||
614 | lbits4 = net->xfrm.policy_hthresh.lbits4; | |
615 | rbits4 = net->xfrm.policy_hthresh.rbits4; | |
616 | lbits6 = net->xfrm.policy_hthresh.lbits6; | |
617 | rbits6 = net->xfrm.policy_hthresh.rbits6; | |
618 | } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq)); | |
619 | ||
9d0380df | 620 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
880a6fab CG |
621 | |
622 | /* reset the bydst and inexact table in all directions */ | |
53c2e285 | 623 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
880a6fab CG |
624 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
625 | hmask = net->xfrm.policy_bydst[dir].hmask; | |
626 | odst = net->xfrm.policy_bydst[dir].table; | |
627 | for (i = hmask; i >= 0; i--) | |
628 | INIT_HLIST_HEAD(odst + i); | |
629 | if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) { | |
630 | /* dir out => dst = remote, src = local */ | |
631 | net->xfrm.policy_bydst[dir].dbits4 = rbits4; | |
632 | net->xfrm.policy_bydst[dir].sbits4 = lbits4; | |
633 | net->xfrm.policy_bydst[dir].dbits6 = rbits6; | |
634 | net->xfrm.policy_bydst[dir].sbits6 = lbits6; | |
635 | } else { | |
636 | /* dir in/fwd => dst = local, src = remote */ | |
637 | net->xfrm.policy_bydst[dir].dbits4 = lbits4; | |
638 | net->xfrm.policy_bydst[dir].sbits4 = rbits4; | |
639 | net->xfrm.policy_bydst[dir].dbits6 = lbits6; | |
640 | net->xfrm.policy_bydst[dir].sbits6 = rbits6; | |
641 | } | |
642 | } | |
643 | ||
644 | /* re-insert all policies by order of creation */ | |
645 | list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) { | |
6916fb3b TB |
646 | if (xfrm_policy_id2dir(policy->index) >= XFRM_POLICY_MAX) { |
647 | /* skip socket policies */ | |
648 | continue; | |
649 | } | |
880a6fab CG |
650 | newpos = NULL; |
651 | chain = policy_hash_bysel(net, &policy->selector, | |
652 | policy->family, | |
653 | xfrm_policy_id2dir(policy->index)); | |
654 | hlist_for_each_entry(pol, chain, bydst) { | |
655 | if (policy->priority >= pol->priority) | |
656 | newpos = &pol->bydst; | |
657 | else | |
658 | break; | |
659 | } | |
660 | if (newpos) | |
661 | hlist_add_behind(&policy->bydst, newpos); | |
662 | else | |
663 | hlist_add_head(&policy->bydst, chain); | |
664 | } | |
665 | ||
9d0380df | 666 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
880a6fab CG |
667 | |
668 | mutex_unlock(&hash_resize_mutex); | |
669 | } | |
670 | ||
671 | void xfrm_policy_hash_rebuild(struct net *net) | |
672 | { | |
673 | schedule_work(&net->xfrm.policy_hthresh.work); | |
674 | } | |
675 | EXPORT_SYMBOL(xfrm_policy_hash_rebuild); | |
676 | ||
1da177e4 LT |
677 | /* Generate new index... KAME seems to generate them ordered by cost |
678 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
e682adf0 | 679 | static u32 xfrm_gen_index(struct net *net, int dir, u32 index) |
1da177e4 | 680 | { |
1da177e4 LT |
681 | static u32 idx_generator; |
682 | ||
683 | for (;;) { | |
2518c7c2 DM |
684 | struct hlist_head *list; |
685 | struct xfrm_policy *p; | |
686 | u32 idx; | |
687 | int found; | |
688 | ||
e682adf0 FD |
689 | if (!index) { |
690 | idx = (idx_generator | dir); | |
691 | idx_generator += 8; | |
692 | } else { | |
693 | idx = index; | |
694 | index = 0; | |
695 | } | |
696 | ||
1da177e4 LT |
697 | if (idx == 0) |
698 | idx = 8; | |
1121994c | 699 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 | 700 | found = 0; |
b67bfe0d | 701 | hlist_for_each_entry(p, list, byidx) { |
2518c7c2 DM |
702 | if (p->index == idx) { |
703 | found = 1; | |
1da177e4 | 704 | break; |
2518c7c2 | 705 | } |
1da177e4 | 706 | } |
2518c7c2 | 707 | if (!found) |
1da177e4 LT |
708 | return idx; |
709 | } | |
710 | } | |
711 | ||
2518c7c2 DM |
712 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
713 | { | |
714 | u32 *p1 = (u32 *) s1; | |
715 | u32 *p2 = (u32 *) s2; | |
716 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
717 | int i; | |
718 | ||
719 | for (i = 0; i < len; i++) { | |
720 | if (p1[i] != p2[i]) | |
721 | return 1; | |
722 | } | |
723 | ||
724 | return 0; | |
725 | } | |
726 | ||
a0073fe1 SK |
727 | static void xfrm_policy_requeue(struct xfrm_policy *old, |
728 | struct xfrm_policy *new) | |
729 | { | |
730 | struct xfrm_policy_queue *pq = &old->polq; | |
731 | struct sk_buff_head list; | |
732 | ||
de2ad486 LR |
733 | if (skb_queue_empty(&pq->hold_queue)) |
734 | return; | |
735 | ||
a0073fe1 SK |
736 | __skb_queue_head_init(&list); |
737 | ||
738 | spin_lock_bh(&pq->hold_queue.lock); | |
739 | skb_queue_splice_init(&pq->hold_queue, &list); | |
e7d8f6cb SK |
740 | if (del_timer(&pq->hold_timer)) |
741 | xfrm_pol_put(old); | |
a0073fe1 SK |
742 | spin_unlock_bh(&pq->hold_queue.lock); |
743 | ||
a0073fe1 SK |
744 | pq = &new->polq; |
745 | ||
746 | spin_lock_bh(&pq->hold_queue.lock); | |
747 | skb_queue_splice(&list, &pq->hold_queue); | |
748 | pq->timeout = XFRM_QUEUE_TMO_MIN; | |
e7d8f6cb SK |
749 | if (!mod_timer(&pq->hold_timer, jiffies)) |
750 | xfrm_pol_hold(new); | |
a0073fe1 SK |
751 | spin_unlock_bh(&pq->hold_queue.lock); |
752 | } | |
753 | ||
7cb8a939 SK |
754 | static bool xfrm_policy_mark_match(struct xfrm_policy *policy, |
755 | struct xfrm_policy *pol) | |
756 | { | |
757 | u32 mark = policy->mark.v & policy->mark.m; | |
758 | ||
759 | if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m) | |
760 | return true; | |
761 | ||
762 | if ((mark & pol->mark.m) == pol->mark.v && | |
763 | policy->priority == pol->priority) | |
764 | return true; | |
765 | ||
766 | return false; | |
767 | } | |
768 | ||
1da177e4 LT |
769 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
770 | { | |
1121994c | 771 | struct net *net = xp_net(policy); |
2518c7c2 DM |
772 | struct xfrm_policy *pol; |
773 | struct xfrm_policy *delpol; | |
774 | struct hlist_head *chain; | |
b67bfe0d | 775 | struct hlist_node *newpos; |
1da177e4 | 776 | |
9d0380df | 777 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
1121994c | 778 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
779 | delpol = NULL; |
780 | newpos = NULL; | |
b67bfe0d | 781 | hlist_for_each_entry(pol, chain, bydst) { |
a6c7ab55 | 782 | if (pol->type == policy->type && |
2518c7c2 | 783 | !selector_cmp(&pol->selector, &policy->selector) && |
7cb8a939 | 784 | xfrm_policy_mark_match(policy, pol) && |
a6c7ab55 HX |
785 | xfrm_sec_ctx_match(pol->security, policy->security) && |
786 | !WARN_ON(delpol)) { | |
1da177e4 | 787 | if (excl) { |
9d0380df | 788 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
789 | return -EEXIST; |
790 | } | |
1da177e4 LT |
791 | delpol = pol; |
792 | if (policy->priority > pol->priority) | |
793 | continue; | |
794 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 795 | newpos = &pol->bydst; |
1da177e4 LT |
796 | continue; |
797 | } | |
1da177e4 LT |
798 | if (delpol) |
799 | break; | |
1da177e4 LT |
800 | } |
801 | if (newpos) | |
1d023284 | 802 | hlist_add_behind(&policy->bydst, newpos); |
2518c7c2 DM |
803 | else |
804 | hlist_add_head(&policy->bydst, chain); | |
12bfa8bd | 805 | __xfrm_policy_link(policy, dir); |
ca925cf1 | 806 | atomic_inc(&net->xfrm.flow_cache_genid); |
ca4c3fc2 | 807 | |
808 | /* After previous checking, family can either be AF_INET or AF_INET6 */ | |
809 | if (policy->family == AF_INET) | |
810 | rt_genid_bump_ipv4(net); | |
811 | else | |
812 | rt_genid_bump_ipv6(net); | |
813 | ||
a0073fe1 SK |
814 | if (delpol) { |
815 | xfrm_policy_requeue(delpol, policy); | |
29fa0b30 | 816 | __xfrm_policy_unlink(delpol, dir); |
a0073fe1 | 817 | } |
e682adf0 | 818 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index); |
1121994c | 819 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); |
9d729f72 | 820 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
821 | policy->curlft.use_time = 0; |
822 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
823 | xfrm_pol_hold(policy); | |
9d0380df | 824 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 825 | |
9b78a82c | 826 | if (delpol) |
1da177e4 | 827 | xfrm_policy_kill(delpol); |
1121994c AD |
828 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
829 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c | 830 | |
1da177e4 LT |
831 | return 0; |
832 | } | |
833 | EXPORT_SYMBOL(xfrm_policy_insert); | |
834 | ||
8ca2e93b JHS |
835 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
836 | int dir, struct xfrm_selector *sel, | |
ef41aaa0 EP |
837 | struct xfrm_sec_ctx *ctx, int delete, |
838 | int *err) | |
1da177e4 | 839 | { |
2518c7c2 DM |
840 | struct xfrm_policy *pol, *ret; |
841 | struct hlist_head *chain; | |
1da177e4 | 842 | |
ef41aaa0 | 843 | *err = 0; |
9d0380df | 844 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
8d1211a6 | 845 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 | 846 | ret = NULL; |
b67bfe0d | 847 | hlist_for_each_entry(pol, chain, bydst) { |
2518c7c2 | 848 | if (pol->type == type && |
34f8d884 | 849 | (mark & pol->mark.m) == pol->mark.v && |
2518c7c2 DM |
850 | !selector_cmp(sel, &pol->selector) && |
851 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 852 | xfrm_pol_hold(pol); |
2518c7c2 | 853 | if (delete) { |
03e1ad7b PM |
854 | *err = security_xfrm_policy_delete( |
855 | pol->security); | |
ef41aaa0 | 856 | if (*err) { |
9d0380df | 857 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ef41aaa0 EP |
858 | return pol; |
859 | } | |
29fa0b30 | 860 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
861 | } |
862 | ret = pol; | |
1da177e4 LT |
863 | break; |
864 | } | |
865 | } | |
9d0380df | 866 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 867 | |
fe1a5f03 | 868 | if (ret && delete) |
2518c7c2 | 869 | xfrm_policy_kill(ret); |
2518c7c2 | 870 | return ret; |
1da177e4 | 871 | } |
df71837d | 872 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 873 | |
8ca2e93b JHS |
874 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
875 | int dir, u32 id, int delete, int *err) | |
1da177e4 | 876 | { |
2518c7c2 DM |
877 | struct xfrm_policy *pol, *ret; |
878 | struct hlist_head *chain; | |
1da177e4 | 879 | |
b5505c6e HX |
880 | *err = -ENOENT; |
881 | if (xfrm_policy_id2dir(id) != dir) | |
882 | return NULL; | |
883 | ||
ef41aaa0 | 884 | *err = 0; |
9d0380df | 885 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
8d1211a6 | 886 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 | 887 | ret = NULL; |
b67bfe0d | 888 | hlist_for_each_entry(pol, chain, byidx) { |
34f8d884 JHS |
889 | if (pol->type == type && pol->index == id && |
890 | (mark & pol->mark.m) == pol->mark.v) { | |
1da177e4 | 891 | xfrm_pol_hold(pol); |
2518c7c2 | 892 | if (delete) { |
03e1ad7b PM |
893 | *err = security_xfrm_policy_delete( |
894 | pol->security); | |
ef41aaa0 | 895 | if (*err) { |
9d0380df | 896 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ef41aaa0 EP |
897 | return pol; |
898 | } | |
29fa0b30 | 899 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
900 | } |
901 | ret = pol; | |
1da177e4 LT |
902 | break; |
903 | } | |
904 | } | |
9d0380df | 905 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 906 | |
fe1a5f03 | 907 | if (ret && delete) |
2518c7c2 | 908 | xfrm_policy_kill(ret); |
2518c7c2 | 909 | return ret; |
1da177e4 LT |
910 | } |
911 | EXPORT_SYMBOL(xfrm_policy_byid); | |
912 | ||
4aa2e62c JL |
913 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
914 | static inline int | |
2e71029e | 915 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid) |
1da177e4 | 916 | { |
4aa2e62c JL |
917 | int dir, err = 0; |
918 | ||
919 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
920 | struct xfrm_policy *pol; | |
4aa2e62c JL |
921 | int i; |
922 | ||
b67bfe0d | 923 | hlist_for_each_entry(pol, |
33ffbbd5 | 924 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
925 | if (pol->type != type) |
926 | continue; | |
03e1ad7b | 927 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 928 | if (err) { |
2e71029e | 929 | xfrm_audit_policy_delete(pol, 0, task_valid); |
4aa2e62c JL |
930 | return err; |
931 | } | |
7dc12d6d | 932 | } |
33ffbbd5 | 933 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
b67bfe0d | 934 | hlist_for_each_entry(pol, |
33ffbbd5 | 935 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
936 | bydst) { |
937 | if (pol->type != type) | |
938 | continue; | |
03e1ad7b PM |
939 | err = security_xfrm_policy_delete( |
940 | pol->security); | |
4aa2e62c | 941 | if (err) { |
ab5f5e8b | 942 | xfrm_audit_policy_delete(pol, 0, |
2e71029e | 943 | task_valid); |
4aa2e62c JL |
944 | return err; |
945 | } | |
946 | } | |
947 | } | |
948 | } | |
949 | return err; | |
950 | } | |
951 | #else | |
952 | static inline int | |
2e71029e | 953 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid) |
4aa2e62c JL |
954 | { |
955 | return 0; | |
956 | } | |
957 | #endif | |
958 | ||
2e71029e | 959 | int xfrm_policy_flush(struct net *net, u8 type, bool task_valid) |
4aa2e62c | 960 | { |
2f1eb65f | 961 | int dir, err = 0, cnt = 0; |
1da177e4 | 962 | |
9d0380df | 963 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
4aa2e62c | 964 | |
2e71029e | 965 | err = xfrm_policy_flush_secctx_check(net, type, task_valid); |
4aa2e62c JL |
966 | if (err) |
967 | goto out; | |
968 | ||
1da177e4 | 969 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 | 970 | struct xfrm_policy *pol; |
29fa0b30 | 971 | int i; |
2518c7c2 DM |
972 | |
973 | again1: | |
b67bfe0d | 974 | hlist_for_each_entry(pol, |
33ffbbd5 | 975 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
976 | if (pol->type != type) |
977 | continue; | |
ea2dea9d | 978 | __xfrm_policy_unlink(pol, dir); |
9d0380df | 979 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ea2dea9d | 980 | cnt++; |
1da177e4 | 981 | |
2e71029e | 982 | xfrm_audit_policy_delete(pol, 1, task_valid); |
161a09e7 | 983 | |
2518c7c2 | 984 | xfrm_policy_kill(pol); |
1da177e4 | 985 | |
4141b36a | 986 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
987 | goto again1; |
988 | } | |
989 | ||
33ffbbd5 | 990 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 | 991 | again2: |
b67bfe0d | 992 | hlist_for_each_entry(pol, |
33ffbbd5 | 993 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
994 | bydst) { |
995 | if (pol->type != type) | |
996 | continue; | |
ea2dea9d | 997 | __xfrm_policy_unlink(pol, dir); |
9d0380df | 998 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ea2dea9d | 999 | cnt++; |
2518c7c2 | 1000 | |
2e71029e | 1001 | xfrm_audit_policy_delete(pol, 1, task_valid); |
2518c7c2 DM |
1002 | xfrm_policy_kill(pol); |
1003 | ||
9d0380df | 1004 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
1005 | goto again2; |
1006 | } | |
1da177e4 | 1007 | } |
2518c7c2 | 1008 | |
1da177e4 | 1009 | } |
2f1eb65f JHS |
1010 | if (!cnt) |
1011 | err = -ESRCH; | |
4aa2e62c | 1012 | out: |
9d0380df | 1013 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
4aa2e62c | 1014 | return err; |
1da177e4 LT |
1015 | } |
1016 | EXPORT_SYMBOL(xfrm_policy_flush); | |
1017 | ||
cdcbca7c | 1018 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 1019 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
1020 | void *data) |
1021 | { | |
12a169e7 HX |
1022 | struct xfrm_policy *pol; |
1023 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
1024 | int error = 0; |
1025 | ||
1026 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
1027 | walk->type != XFRM_POLICY_TYPE_ANY) | |
1028 | return -EINVAL; | |
1da177e4 | 1029 | |
12a169e7 | 1030 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
1031 | return 0; |
1032 | ||
9d0380df | 1033 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
12a169e7 | 1034 | if (list_empty(&walk->walk.all)) |
cdcbca7c | 1035 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 | 1036 | else |
80077702 LR |
1037 | x = list_first_entry(&walk->walk.all, |
1038 | struct xfrm_policy_walk_entry, all); | |
1039 | ||
cdcbca7c | 1040 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 1041 | if (x->dead) |
4c563f76 | 1042 | continue; |
12a169e7 HX |
1043 | pol = container_of(x, struct xfrm_policy, walk); |
1044 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
1045 | walk->type != pol->type) | |
1046 | continue; | |
1047 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
1048 | walk->seq, data); | |
1049 | if (error) { | |
1050 | list_move_tail(&walk->walk.all, &x->all); | |
1051 | goto out; | |
2518c7c2 | 1052 | } |
12a169e7 | 1053 | walk->seq++; |
1da177e4 | 1054 | } |
12a169e7 | 1055 | if (walk->seq == 0) { |
baf5d743 JHS |
1056 | error = -ENOENT; |
1057 | goto out; | |
1058 | } | |
12a169e7 | 1059 | list_del_init(&walk->walk.all); |
1da177e4 | 1060 | out: |
9d0380df | 1061 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1062 | return error; |
1063 | } | |
1064 | EXPORT_SYMBOL(xfrm_policy_walk); | |
1065 | ||
12a169e7 HX |
1066 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
1067 | { | |
1068 | INIT_LIST_HEAD(&walk->walk.all); | |
1069 | walk->walk.dead = 1; | |
1070 | walk->type = type; | |
1071 | walk->seq = 0; | |
1072 | } | |
1073 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
1074 | ||
283bc9f3 | 1075 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net) |
12a169e7 HX |
1076 | { |
1077 | if (list_empty(&walk->walk.all)) | |
1078 | return; | |
1079 | ||
9d0380df | 1080 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */ |
12a169e7 | 1081 | list_del(&walk->walk.all); |
9d0380df | 1082 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
12a169e7 HX |
1083 | } |
1084 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
1085 | ||
134b0fc5 JM |
1086 | /* |
1087 | * Find policy to apply to this flow. | |
1088 | * | |
1089 | * Returns 0 if policy found, else an -errno. | |
1090 | */ | |
f299d557 DM |
1091 | static int xfrm_policy_match(const struct xfrm_policy *pol, |
1092 | const struct flowi *fl, | |
2518c7c2 | 1093 | u8 type, u16 family, int dir) |
1da177e4 | 1094 | { |
f299d557 | 1095 | const struct xfrm_selector *sel = &pol->selector; |
bc9b35ad DM |
1096 | int ret = -ESRCH; |
1097 | bool match; | |
1da177e4 | 1098 | |
2518c7c2 | 1099 | if (pol->family != family || |
1d28f42c | 1100 | (fl->flowi_mark & pol->mark.m) != pol->mark.v || |
2518c7c2 | 1101 | pol->type != type) |
134b0fc5 | 1102 | return ret; |
1da177e4 | 1103 | |
2518c7c2 | 1104 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 1105 | if (match) |
1d28f42c | 1106 | ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid, |
03e1ad7b | 1107 | dir); |
2518c7c2 | 1108 | |
134b0fc5 | 1109 | return ret; |
2518c7c2 | 1110 | } |
1da177e4 | 1111 | |
52479b62 | 1112 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
062cdb43 | 1113 | const struct flowi *fl, |
2518c7c2 DM |
1114 | u16 family, u8 dir) |
1115 | { | |
134b0fc5 | 1116 | int err; |
2518c7c2 | 1117 | struct xfrm_policy *pol, *ret; |
0b597e7e | 1118 | const xfrm_address_t *daddr, *saddr; |
2518c7c2 | 1119 | struct hlist_head *chain; |
30846090 FW |
1120 | unsigned int sequence; |
1121 | u32 priority; | |
df71837d | 1122 | |
2518c7c2 DM |
1123 | daddr = xfrm_flowi_daddr(fl, family); |
1124 | saddr = xfrm_flowi_saddr(fl, family); | |
1125 | if (unlikely(!daddr || !saddr)) | |
1126 | return NULL; | |
1127 | ||
a7c44247 | 1128 | rcu_read_lock(); |
30846090 FW |
1129 | retry: |
1130 | do { | |
1131 | sequence = read_seqcount_begin(&xfrm_policy_hash_generation); | |
1132 | chain = policy_hash_direct(net, daddr, saddr, family, dir); | |
1133 | } while (read_seqcount_retry(&xfrm_policy_hash_generation, sequence)); | |
1134 | ||
1135 | priority = ~0U; | |
2518c7c2 | 1136 | ret = NULL; |
a5eefc1d | 1137 | hlist_for_each_entry_rcu(pol, chain, bydst) { |
134b0fc5 JM |
1138 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1139 | if (err) { | |
1140 | if (err == -ESRCH) | |
1141 | continue; | |
1142 | else { | |
1143 | ret = ERR_PTR(err); | |
1144 | goto fail; | |
1145 | } | |
1146 | } else { | |
2518c7c2 | 1147 | ret = pol; |
acba48e1 | 1148 | priority = ret->priority; |
2518c7c2 DM |
1149 | break; |
1150 | } | |
1151 | } | |
52479b62 | 1152 | chain = &net->xfrm.policy_inexact[dir]; |
a5eefc1d | 1153 | hlist_for_each_entry_rcu(pol, chain, bydst) { |
8faf491e LR |
1154 | if ((pol->priority >= priority) && ret) |
1155 | break; | |
1156 | ||
134b0fc5 JM |
1157 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1158 | if (err) { | |
1159 | if (err == -ESRCH) | |
1160 | continue; | |
1161 | else { | |
1162 | ret = ERR_PTR(err); | |
1163 | goto fail; | |
1164 | } | |
8faf491e | 1165 | } else { |
acba48e1 DM |
1166 | ret = pol; |
1167 | break; | |
1da177e4 LT |
1168 | } |
1169 | } | |
586f2eb4 | 1170 | |
30846090 FW |
1171 | if (read_seqcount_retry(&xfrm_policy_hash_generation, sequence)) |
1172 | goto retry; | |
1173 | ||
e37cc8ad FW |
1174 | if (ret && !xfrm_pol_hold_rcu(ret)) |
1175 | goto retry; | |
134b0fc5 | 1176 | fail: |
a7c44247 | 1177 | rcu_read_unlock(); |
4e81bb83 | 1178 | |
2518c7c2 | 1179 | return ret; |
4e81bb83 MN |
1180 | } |
1181 | ||
80c802f3 | 1182 | static struct xfrm_policy * |
73ff93cd | 1183 | __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir) |
80c802f3 TT |
1184 | { |
1185 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1186 | struct xfrm_policy *pol; | |
1187 | ||
1188 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
1189 | if (pol != NULL) | |
1190 | return pol; | |
1191 | #endif | |
1192 | return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
1193 | } | |
1194 | ||
b5fb82c4 BZ |
1195 | static int flow_to_policy_dir(int dir) |
1196 | { | |
1197 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
1198 | XFRM_POLICY_OUT == FLOW_DIR_OUT && | |
1199 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1200 | return dir; | |
1201 | ||
1202 | switch (dir) { | |
1203 | default: | |
1204 | case FLOW_DIR_IN: | |
1205 | return XFRM_POLICY_IN; | |
1206 | case FLOW_DIR_OUT: | |
1207 | return XFRM_POLICY_OUT; | |
1208 | case FLOW_DIR_FWD: | |
1209 | return XFRM_POLICY_FWD; | |
1210 | } | |
1211 | } | |
1212 | ||
fe1a5f03 | 1213 | static struct flow_cache_object * |
dee9f4bc | 1214 | xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, |
fe1a5f03 | 1215 | u8 dir, struct flow_cache_object *old_obj, void *ctx) |
4e81bb83 MN |
1216 | { |
1217 | struct xfrm_policy *pol; | |
fe1a5f03 TT |
1218 | |
1219 | if (old_obj) | |
1220 | xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); | |
4e81bb83 | 1221 | |
b5fb82c4 | 1222 | pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir)); |
80c802f3 | 1223 | if (IS_ERR_OR_NULL(pol)) |
fe1a5f03 | 1224 | return ERR_CAST(pol); |
fe1a5f03 | 1225 | |
fe1a5f03 TT |
1226 | /* Resolver returns two references: |
1227 | * one for cache and one for caller of flow_cache_lookup() */ | |
1228 | xfrm_pol_hold(pol); | |
1229 | ||
1230 | return &pol->flo; | |
1da177e4 LT |
1231 | } |
1232 | ||
df71837d TJ |
1233 | static inline int policy_to_flow_dir(int dir) |
1234 | { | |
1235 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1236 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1237 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1238 | return dir; | |
1239 | switch (dir) { | |
1240 | default: | |
1241 | case XFRM_POLICY_IN: | |
1242 | return FLOW_DIR_IN; | |
1243 | case XFRM_POLICY_OUT: | |
1244 | return FLOW_DIR_OUT; | |
1245 | case XFRM_POLICY_FWD: | |
1246 | return FLOW_DIR_FWD; | |
3ff50b79 | 1247 | } |
df71837d TJ |
1248 | } |
1249 | ||
6f9c9615 | 1250 | static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir, |
dee9f4bc | 1251 | const struct flowi *fl) |
1da177e4 LT |
1252 | { |
1253 | struct xfrm_policy *pol; | |
1254 | ||
d188ba86 | 1255 | rcu_read_lock(); |
ae33786f | 1256 | again: |
d188ba86 ED |
1257 | pol = rcu_dereference(sk->sk_policy[dir]); |
1258 | if (pol != NULL) { | |
bc9b35ad DM |
1259 | bool match = xfrm_selector_match(&pol->selector, fl, |
1260 | sk->sk_family); | |
a716c119 | 1261 | int err = 0; |
df71837d | 1262 | |
3bccfbc7 | 1263 | if (match) { |
34f8d884 JHS |
1264 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
1265 | pol = NULL; | |
1266 | goto out; | |
1267 | } | |
03e1ad7b | 1268 | err = security_xfrm_policy_lookup(pol->security, |
1d28f42c | 1269 | fl->flowi_secid, |
03e1ad7b | 1270 | policy_to_flow_dir(dir)); |
330e832a FW |
1271 | if (!err) { |
1272 | if (!xfrm_pol_hold_rcu(pol)) | |
1273 | goto again; | |
1274 | } else if (err == -ESRCH) { | |
3bccfbc7 | 1275 | pol = NULL; |
330e832a | 1276 | } else { |
3bccfbc7 | 1277 | pol = ERR_PTR(err); |
330e832a | 1278 | } |
3bccfbc7 | 1279 | } else |
1da177e4 LT |
1280 | pol = NULL; |
1281 | } | |
34f8d884 | 1282 | out: |
d188ba86 | 1283 | rcu_read_unlock(); |
1da177e4 LT |
1284 | return pol; |
1285 | } | |
1286 | ||
1287 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1288 | { | |
98806f75 | 1289 | struct net *net = xp_net(pol); |
4e81bb83 | 1290 | |
98806f75 | 1291 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
98806f75 | 1292 | net->xfrm.policy_count[dir]++; |
1da177e4 LT |
1293 | xfrm_pol_hold(pol); |
1294 | } | |
1295 | ||
1296 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1297 | int dir) | |
1298 | { | |
98806f75 AD |
1299 | struct net *net = xp_net(pol); |
1300 | ||
53c2e285 | 1301 | if (list_empty(&pol->walk.all)) |
2518c7c2 | 1302 | return NULL; |
1da177e4 | 1303 | |
53c2e285 HX |
1304 | /* Socket policies are not hashed. */ |
1305 | if (!hlist_unhashed(&pol->bydst)) { | |
a5eefc1d | 1306 | hlist_del_rcu(&pol->bydst); |
53c2e285 HX |
1307 | hlist_del(&pol->byidx); |
1308 | } | |
1309 | ||
1310 | list_del_init(&pol->walk.all); | |
98806f75 | 1311 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1312 | |
1313 | return pol; | |
1da177e4 LT |
1314 | } |
1315 | ||
53c2e285 HX |
1316 | static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir) |
1317 | { | |
1318 | __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir); | |
1319 | } | |
1320 | ||
1321 | static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir) | |
1322 | { | |
1323 | __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir); | |
1324 | } | |
1325 | ||
4666faab | 1326 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 | 1327 | { |
283bc9f3 FD |
1328 | struct net *net = xp_net(pol); |
1329 | ||
9d0380df | 1330 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 1331 | pol = __xfrm_policy_unlink(pol, dir); |
9d0380df | 1332 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 1333 | if (pol) { |
1da177e4 | 1334 | xfrm_policy_kill(pol); |
4666faab | 1335 | return 0; |
1da177e4 | 1336 | } |
4666faab | 1337 | return -ENOENT; |
1da177e4 | 1338 | } |
a70fcb0b | 1339 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1340 | |
1341 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1342 | { | |
1121994c | 1343 | struct net *net = xp_net(pol); |
1da177e4 LT |
1344 | struct xfrm_policy *old_pol; |
1345 | ||
4e81bb83 MN |
1346 | #ifdef CONFIG_XFRM_SUB_POLICY |
1347 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1348 | return -EINVAL; | |
1349 | #endif | |
1350 | ||
9d0380df | 1351 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
d188ba86 ED |
1352 | old_pol = rcu_dereference_protected(sk->sk_policy[dir], |
1353 | lockdep_is_held(&net->xfrm.xfrm_policy_lock)); | |
1da177e4 | 1354 | if (pol) { |
9d729f72 | 1355 | pol->curlft.add_time = get_seconds(); |
e682adf0 | 1356 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0); |
53c2e285 | 1357 | xfrm_sk_policy_link(pol, dir); |
1da177e4 | 1358 | } |
d188ba86 | 1359 | rcu_assign_pointer(sk->sk_policy[dir], pol); |
a0073fe1 SK |
1360 | if (old_pol) { |
1361 | if (pol) | |
1362 | xfrm_policy_requeue(old_pol, pol); | |
1363 | ||
ea2dea9d TT |
1364 | /* Unlinking succeeds always. This is the only function |
1365 | * allowed to delete or replace socket policy. | |
1366 | */ | |
53c2e285 | 1367 | xfrm_sk_policy_unlink(old_pol, dir); |
a0073fe1 | 1368 | } |
9d0380df | 1369 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1370 | |
1371 | if (old_pol) { | |
1372 | xfrm_policy_kill(old_pol); | |
1373 | } | |
1374 | return 0; | |
1375 | } | |
1376 | ||
d3e40a9f | 1377 | static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir) |
1da177e4 | 1378 | { |
0331b1f3 | 1379 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
283bc9f3 | 1380 | struct net *net = xp_net(old); |
1da177e4 LT |
1381 | |
1382 | if (newp) { | |
1383 | newp->selector = old->selector; | |
03e1ad7b PM |
1384 | if (security_xfrm_policy_clone(old->security, |
1385 | &newp->security)) { | |
df71837d TJ |
1386 | kfree(newp); |
1387 | return NULL; /* ENOMEM */ | |
1388 | } | |
1da177e4 LT |
1389 | newp->lft = old->lft; |
1390 | newp->curlft = old->curlft; | |
fb977e2c | 1391 | newp->mark = old->mark; |
1da177e4 LT |
1392 | newp->action = old->action; |
1393 | newp->flags = old->flags; | |
1394 | newp->xfrm_nr = old->xfrm_nr; | |
1395 | newp->index = old->index; | |
4e81bb83 | 1396 | newp->type = old->type; |
1da177e4 LT |
1397 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1398 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
9d0380df | 1399 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
53c2e285 | 1400 | xfrm_sk_policy_link(newp, dir); |
9d0380df | 1401 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1402 | xfrm_pol_put(newp); |
1403 | } | |
1404 | return newp; | |
1405 | } | |
1406 | ||
d188ba86 | 1407 | int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) |
1da177e4 | 1408 | { |
d188ba86 ED |
1409 | const struct xfrm_policy *p; |
1410 | struct xfrm_policy *np; | |
1411 | int i, ret = 0; | |
1412 | ||
1413 | rcu_read_lock(); | |
1414 | for (i = 0; i < 2; i++) { | |
1415 | p = rcu_dereference(osk->sk_policy[i]); | |
1416 | if (p) { | |
1417 | np = clone_policy(p, i); | |
1418 | if (unlikely(!np)) { | |
1419 | ret = -ENOMEM; | |
1420 | break; | |
1421 | } | |
1422 | rcu_assign_pointer(sk->sk_policy[i], np); | |
1423 | } | |
1424 | } | |
1425 | rcu_read_unlock(); | |
1426 | return ret; | |
1da177e4 LT |
1427 | } |
1428 | ||
a1e59abf | 1429 | static int |
42a7b32b DA |
1430 | xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local, |
1431 | xfrm_address_t *remote, unsigned short family) | |
a1e59abf PM |
1432 | { |
1433 | int err; | |
1434 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1435 | ||
1436 | if (unlikely(afinfo == NULL)) | |
1437 | return -EINVAL; | |
42a7b32b | 1438 | err = afinfo->get_saddr(net, oif, local, remote); |
a1e59abf PM |
1439 | xfrm_policy_put_afinfo(afinfo); |
1440 | return err; | |
1441 | } | |
1442 | ||
1da177e4 LT |
1443 | /* Resolve list of templates for the flow, given policy. */ |
1444 | ||
1445 | static int | |
a6c2e611 DM |
1446 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl, |
1447 | struct xfrm_state **xfrm, unsigned short family) | |
1da177e4 | 1448 | { |
fbda33b2 | 1449 | struct net *net = xp_net(policy); |
1da177e4 LT |
1450 | int nx; |
1451 | int i, error; | |
1452 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1453 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1454 | xfrm_address_t tmp; |
1da177e4 | 1455 | |
9b7a787d | 1456 | for (nx = 0, i = 0; i < policy->xfrm_nr; i++) { |
1da177e4 LT |
1457 | struct xfrm_state *x; |
1458 | xfrm_address_t *remote = daddr; | |
1459 | xfrm_address_t *local = saddr; | |
1460 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1461 | ||
48b8d783 JK |
1462 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1463 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1464 | remote = &tmpl->id.daddr; |
1465 | local = &tmpl->saddr; | |
8444cf71 | 1466 | if (xfrm_addr_any(local, tmpl->encap_family)) { |
42a7b32b DA |
1467 | error = xfrm_get_saddr(net, fl->flowi_oif, |
1468 | &tmp, remote, | |
1469 | tmpl->encap_family); | |
a1e59abf PM |
1470 | if (error) |
1471 | goto fail; | |
1472 | local = &tmp; | |
1473 | } | |
1da177e4 LT |
1474 | } |
1475 | ||
1476 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1477 | ||
1478 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1479 | xfrm[nx++] = x; | |
1480 | daddr = remote; | |
1481 | saddr = local; | |
1482 | continue; | |
1483 | } | |
1484 | if (x) { | |
1485 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1486 | -EINVAL : -EAGAIN); | |
1487 | xfrm_state_put(x); | |
42054569 | 1488 | } else if (error == -ESRCH) { |
a4322266 | 1489 | error = -EAGAIN; |
42054569 | 1490 | } |
1da177e4 LT |
1491 | |
1492 | if (!tmpl->optional) | |
1493 | goto fail; | |
1494 | } | |
1495 | return nx; | |
1496 | ||
1497 | fail: | |
9b7a787d | 1498 | for (nx--; nx >= 0; nx--) |
1da177e4 LT |
1499 | xfrm_state_put(xfrm[nx]); |
1500 | return error; | |
1501 | } | |
1502 | ||
4e81bb83 | 1503 | static int |
a6c2e611 DM |
1504 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl, |
1505 | struct xfrm_state **xfrm, unsigned short family) | |
4e81bb83 | 1506 | { |
41a49cc3 MN |
1507 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1508 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1509 | int cnx = 0; |
1510 | int error; | |
1511 | int ret; | |
1512 | int i; | |
1513 | ||
1514 | for (i = 0; i < npols; i++) { | |
1515 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1516 | error = -ENOBUFS; | |
1517 | goto fail; | |
1518 | } | |
41a49cc3 MN |
1519 | |
1520 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1521 | if (ret < 0) { |
1522 | error = ret; | |
1523 | goto fail; | |
1524 | } else | |
1525 | cnx += ret; | |
1526 | } | |
1527 | ||
41a49cc3 MN |
1528 | /* found states are sorted for outbound processing */ |
1529 | if (npols > 1) | |
1530 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1531 | ||
4e81bb83 MN |
1532 | return cnx; |
1533 | ||
1534 | fail: | |
9b7a787d | 1535 | for (cnx--; cnx >= 0; cnx--) |
41a49cc3 | 1536 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1537 | return error; |
1538 | ||
1539 | } | |
1540 | ||
1da177e4 LT |
1541 | /* Check that the bundle accepts the flow and its components are |
1542 | * still valid. | |
1543 | */ | |
1544 | ||
05d84025 | 1545 | static inline int xfrm_get_tos(const struct flowi *fl, int family) |
25ee3286 HX |
1546 | { |
1547 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1548 | int tos; | |
1da177e4 | 1549 | |
25ee3286 HX |
1550 | if (!afinfo) |
1551 | return -EINVAL; | |
1552 | ||
1553 | tos = afinfo->get_tos(fl); | |
1554 | ||
1555 | xfrm_policy_put_afinfo(afinfo); | |
1556 | ||
1557 | return tos; | |
1558 | } | |
1559 | ||
80c802f3 TT |
1560 | static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) |
1561 | { | |
1562 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1563 | struct dst_entry *dst = &xdst->u.dst; | |
1564 | ||
1565 | if (xdst->route == NULL) { | |
1566 | /* Dummy bundle - if it has xfrms we were not | |
1567 | * able to build bundle as template resolution failed. | |
1568 | * It means we need to try again resolving. */ | |
1569 | if (xdst->num_xfrms > 0) | |
1570 | return NULL; | |
a0073fe1 SK |
1571 | } else if (dst->flags & DST_XFRM_QUEUE) { |
1572 | return NULL; | |
80c802f3 TT |
1573 | } else { |
1574 | /* Real bundle */ | |
1575 | if (stale_bundle(dst)) | |
1576 | return NULL; | |
1577 | } | |
1578 | ||
1579 | dst_hold(dst); | |
1580 | return flo; | |
1581 | } | |
1582 | ||
1583 | static int xfrm_bundle_flo_check(struct flow_cache_object *flo) | |
1584 | { | |
1585 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1586 | struct dst_entry *dst = &xdst->u.dst; | |
1587 | ||
1588 | if (!xdst->route) | |
1589 | return 0; | |
1590 | if (stale_bundle(dst)) | |
1591 | return 0; | |
1592 | ||
1593 | return 1; | |
1594 | } | |
1595 | ||
1596 | static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) | |
1597 | { | |
1598 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1599 | struct dst_entry *dst = &xdst->u.dst; | |
1600 | ||
1601 | dst_free(dst); | |
1602 | } | |
1603 | ||
1604 | static const struct flow_cache_ops xfrm_bundle_fc_ops = { | |
1605 | .get = xfrm_bundle_flo_get, | |
1606 | .check = xfrm_bundle_flo_check, | |
1607 | .delete = xfrm_bundle_flo_delete, | |
1608 | }; | |
1609 | ||
d7c7544c | 1610 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1611 | { |
1da177e4 | 1612 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1613 | struct dst_ops *dst_ops; |
25ee3286 HX |
1614 | struct xfrm_dst *xdst; |
1615 | ||
1616 | if (!afinfo) | |
1617 | return ERR_PTR(-EINVAL); | |
1618 | ||
d7c7544c AD |
1619 | switch (family) { |
1620 | case AF_INET: | |
1621 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1622 | break; | |
dfd56b8b | 1623 | #if IS_ENABLED(CONFIG_IPV6) |
d7c7544c AD |
1624 | case AF_INET6: |
1625 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1626 | break; | |
1627 | #endif | |
1628 | default: | |
1629 | BUG(); | |
1630 | } | |
f5b0a874 | 1631 | xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0); |
25ee3286 | 1632 | |
d4cae562 | 1633 | if (likely(xdst)) { |
141e369d SK |
1634 | struct dst_entry *dst = &xdst->u.dst; |
1635 | ||
1636 | memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst)); | |
0b150932 | 1637 | xdst->flo.ops = &xfrm_bundle_fc_ops; |
d4cae562 | 1638 | } else |
0b150932 | 1639 | xdst = ERR_PTR(-ENOBUFS); |
80c802f3 | 1640 | |
d4cae562 MB |
1641 | xfrm_policy_put_afinfo(afinfo); |
1642 | ||
25ee3286 HX |
1643 | return xdst; |
1644 | } | |
1645 | ||
a1b05140 MN |
1646 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1647 | int nfheader_len) | |
1648 | { | |
1649 | struct xfrm_policy_afinfo *afinfo = | |
1650 | xfrm_policy_get_afinfo(dst->ops->family); | |
1651 | int err; | |
1652 | ||
1653 | if (!afinfo) | |
1654 | return -EINVAL; | |
1655 | ||
1656 | err = afinfo->init_path(path, dst, nfheader_len); | |
1657 | ||
1658 | xfrm_policy_put_afinfo(afinfo); | |
1659 | ||
1660 | return err; | |
1661 | } | |
1662 | ||
87c1e12b | 1663 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 1664 | const struct flowi *fl) |
25ee3286 HX |
1665 | { |
1666 | struct xfrm_policy_afinfo *afinfo = | |
1667 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1668 | int err; | |
1669 | ||
1670 | if (!afinfo) | |
1da177e4 | 1671 | return -EINVAL; |
25ee3286 | 1672 | |
87c1e12b | 1673 | err = afinfo->fill_dst(xdst, dev, fl); |
25ee3286 | 1674 | |
1da177e4 | 1675 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1676 | |
1da177e4 LT |
1677 | return err; |
1678 | } | |
1679 | ||
80c802f3 | 1680 | |
25ee3286 HX |
1681 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1682 | * all the metrics... Shortly, bundle a bundle. | |
1683 | */ | |
1684 | ||
1685 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1686 | struct xfrm_state **xfrm, int nx, | |
98313ada | 1687 | const struct flowi *fl, |
25ee3286 HX |
1688 | struct dst_entry *dst) |
1689 | { | |
d7c7544c | 1690 | struct net *net = xp_net(policy); |
25ee3286 HX |
1691 | unsigned long now = jiffies; |
1692 | struct net_device *dev; | |
43a4dea4 | 1693 | struct xfrm_mode *inner_mode; |
25ee3286 HX |
1694 | struct dst_entry *dst_prev = NULL; |
1695 | struct dst_entry *dst0 = NULL; | |
1696 | int i = 0; | |
1697 | int err; | |
1698 | int header_len = 0; | |
a1b05140 | 1699 | int nfheader_len = 0; |
25ee3286 HX |
1700 | int trailer_len = 0; |
1701 | int tos; | |
1702 | int family = policy->selector.family; | |
9bb182a7 YH |
1703 | xfrm_address_t saddr, daddr; |
1704 | ||
1705 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1706 | |
1707 | tos = xfrm_get_tos(fl, family); | |
1708 | err = tos; | |
1709 | if (tos < 0) | |
1710 | goto put_states; | |
1711 | ||
1712 | dst_hold(dst); | |
1713 | ||
1714 | for (; i < nx; i++) { | |
d7c7544c | 1715 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1716 | struct dst_entry *dst1 = &xdst->u.dst; |
1717 | ||
1718 | err = PTR_ERR(xdst); | |
1719 | if (IS_ERR(xdst)) { | |
1720 | dst_release(dst); | |
1721 | goto put_states; | |
1722 | } | |
1723 | ||
43a4dea4 SK |
1724 | if (xfrm[i]->sel.family == AF_UNSPEC) { |
1725 | inner_mode = xfrm_ip2inner_mode(xfrm[i], | |
1726 | xfrm_af2proto(family)); | |
1727 | if (!inner_mode) { | |
1728 | err = -EAFNOSUPPORT; | |
1729 | dst_release(dst); | |
1730 | goto put_states; | |
1731 | } | |
1732 | } else | |
1733 | inner_mode = xfrm[i]->inner_mode; | |
1734 | ||
25ee3286 HX |
1735 | if (!dst_prev) |
1736 | dst0 = dst1; | |
1737 | else { | |
1738 | dst_prev->child = dst_clone(dst1); | |
1739 | dst1->flags |= DST_NOHASH; | |
1740 | } | |
1741 | ||
1742 | xdst->route = dst; | |
defb3519 | 1743 | dst_copy_metrics(dst1, dst); |
25ee3286 HX |
1744 | |
1745 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1746 | family = xfrm[i]->props.family; | |
42a7b32b DA |
1747 | dst = xfrm_dst_lookup(xfrm[i], tos, fl->flowi_oif, |
1748 | &saddr, &daddr, family); | |
25ee3286 HX |
1749 | err = PTR_ERR(dst); |
1750 | if (IS_ERR(dst)) | |
1751 | goto put_states; | |
1752 | } else | |
1753 | dst_hold(dst); | |
1754 | ||
1755 | dst1->xfrm = xfrm[i]; | |
80c802f3 | 1756 | xdst->xfrm_genid = xfrm[i]->genid; |
25ee3286 | 1757 | |
f5b0a874 | 1758 | dst1->obsolete = DST_OBSOLETE_FORCE_CHK; |
25ee3286 HX |
1759 | dst1->flags |= DST_HOST; |
1760 | dst1->lastuse = now; | |
1761 | ||
1762 | dst1->input = dst_discard; | |
43a4dea4 | 1763 | dst1->output = inner_mode->afinfo->output; |
25ee3286 HX |
1764 | |
1765 | dst1->next = dst_prev; | |
1766 | dst_prev = dst1; | |
1767 | ||
1768 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1769 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1770 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1771 | trailer_len += xfrm[i]->props.trailer_len; |
1772 | } | |
1773 | ||
1774 | dst_prev->child = dst; | |
1775 | dst0->path = dst; | |
1776 | ||
1777 | err = -ENODEV; | |
1778 | dev = dst->dev; | |
1779 | if (!dev) | |
1780 | goto free_dst; | |
1781 | ||
a1b05140 | 1782 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1783 | xfrm_init_pmtu(dst_prev); |
1784 | ||
1785 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1786 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1787 | ||
87c1e12b | 1788 | err = xfrm_fill_dst(xdst, dev, fl); |
25ee3286 HX |
1789 | if (err) |
1790 | goto free_dst; | |
1791 | ||
1792 | dst_prev->header_len = header_len; | |
1793 | dst_prev->trailer_len = trailer_len; | |
1794 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1795 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1796 | } | |
1797 | ||
1798 | out: | |
1799 | return dst0; | |
1800 | ||
1801 | put_states: | |
1802 | for (; i < nx; i++) | |
1803 | xfrm_state_put(xfrm[i]); | |
1804 | free_dst: | |
1805 | if (dst0) | |
1806 | dst_free(dst0); | |
1807 | dst0 = ERR_PTR(err); | |
1808 | goto out; | |
1809 | } | |
1810 | ||
da7c224b | 1811 | #ifdef CONFIG_XFRM_SUB_POLICY |
be7928d2 | 1812 | static int xfrm_dst_alloc_copy(void **target, const void *src, int size) |
157bfc25 MN |
1813 | { |
1814 | if (!*target) { | |
1815 | *target = kmalloc(size, GFP_ATOMIC); | |
1816 | if (!*target) | |
1817 | return -ENOMEM; | |
1818 | } | |
be7928d2 | 1819 | |
157bfc25 MN |
1820 | memcpy(*target, src, size); |
1821 | return 0; | |
1822 | } | |
da7c224b | 1823 | #endif |
157bfc25 | 1824 | |
be7928d2 DB |
1825 | static int xfrm_dst_update_parent(struct dst_entry *dst, |
1826 | const struct xfrm_selector *sel) | |
157bfc25 MN |
1827 | { |
1828 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1829 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1830 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1831 | sel, sizeof(*sel)); | |
1832 | #else | |
1833 | return 0; | |
1834 | #endif | |
1835 | } | |
1836 | ||
be7928d2 DB |
1837 | static int xfrm_dst_update_origin(struct dst_entry *dst, |
1838 | const struct flowi *fl) | |
157bfc25 MN |
1839 | { |
1840 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1841 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1842 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1843 | #else | |
1844 | return 0; | |
1845 | #endif | |
1846 | } | |
1da177e4 | 1847 | |
73ff93cd | 1848 | static int xfrm_expand_policies(const struct flowi *fl, u16 family, |
80c802f3 TT |
1849 | struct xfrm_policy **pols, |
1850 | int *num_pols, int *num_xfrms) | |
1851 | { | |
1852 | int i; | |
1853 | ||
1854 | if (*num_pols == 0 || !pols[0]) { | |
1855 | *num_pols = 0; | |
1856 | *num_xfrms = 0; | |
1857 | return 0; | |
1858 | } | |
1859 | if (IS_ERR(pols[0])) | |
1860 | return PTR_ERR(pols[0]); | |
1861 | ||
1862 | *num_xfrms = pols[0]->xfrm_nr; | |
1863 | ||
1864 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1865 | if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW && | |
1866 | pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1867 | pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), | |
1868 | XFRM_POLICY_TYPE_MAIN, | |
1869 | fl, family, | |
1870 | XFRM_POLICY_OUT); | |
1871 | if (pols[1]) { | |
1872 | if (IS_ERR(pols[1])) { | |
1873 | xfrm_pols_put(pols, *num_pols); | |
1874 | return PTR_ERR(pols[1]); | |
1875 | } | |
02d0892f | 1876 | (*num_pols)++; |
80c802f3 TT |
1877 | (*num_xfrms) += pols[1]->xfrm_nr; |
1878 | } | |
1879 | } | |
1880 | #endif | |
1881 | for (i = 0; i < *num_pols; i++) { | |
1882 | if (pols[i]->action != XFRM_POLICY_ALLOW) { | |
1883 | *num_xfrms = -1; | |
1884 | break; | |
1885 | } | |
1886 | } | |
1887 | ||
1888 | return 0; | |
1889 | ||
1890 | } | |
1891 | ||
1892 | static struct xfrm_dst * | |
1893 | xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, | |
4ca2e685 | 1894 | const struct flowi *fl, u16 family, |
80c802f3 TT |
1895 | struct dst_entry *dst_orig) |
1896 | { | |
1897 | struct net *net = xp_net(pols[0]); | |
1898 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
1899 | struct dst_entry *dst; | |
1900 | struct xfrm_dst *xdst; | |
1901 | int err; | |
1902 | ||
1903 | /* Try to instantiate a bundle */ | |
1904 | err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); | |
d809ec89 TT |
1905 | if (err <= 0) { |
1906 | if (err != 0 && err != -EAGAIN) | |
80c802f3 TT |
1907 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
1908 | return ERR_PTR(err); | |
1909 | } | |
1910 | ||
1911 | dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig); | |
1912 | if (IS_ERR(dst)) { | |
1913 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1914 | return ERR_CAST(dst); | |
1915 | } | |
1916 | ||
1917 | xdst = (struct xfrm_dst *)dst; | |
1918 | xdst->num_xfrms = err; | |
1919 | if (num_pols > 1) | |
1920 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1921 | else | |
1922 | err = xfrm_dst_update_origin(dst, fl); | |
1923 | if (unlikely(err)) { | |
1924 | dst_free(dst); | |
1925 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
1926 | return ERR_PTR(err); | |
1927 | } | |
1928 | ||
1929 | xdst->num_pols = num_pols; | |
3e94c2dc | 1930 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 TT |
1931 | xdst->policy_genid = atomic_read(&pols[0]->genid); |
1932 | ||
1933 | return xdst; | |
1934 | } | |
1935 | ||
a0073fe1 SK |
1936 | static void xfrm_policy_queue_process(unsigned long arg) |
1937 | { | |
a0073fe1 SK |
1938 | struct sk_buff *skb; |
1939 | struct sock *sk; | |
1940 | struct dst_entry *dst; | |
a0073fe1 | 1941 | struct xfrm_policy *pol = (struct xfrm_policy *)arg; |
3f5312ae | 1942 | struct net *net = xp_net(pol); |
a0073fe1 SK |
1943 | struct xfrm_policy_queue *pq = &pol->polq; |
1944 | struct flowi fl; | |
1945 | struct sk_buff_head list; | |
1946 | ||
1947 | spin_lock(&pq->hold_queue.lock); | |
1948 | skb = skb_peek(&pq->hold_queue); | |
2bb53e25 SK |
1949 | if (!skb) { |
1950 | spin_unlock(&pq->hold_queue.lock); | |
1951 | goto out; | |
1952 | } | |
a0073fe1 SK |
1953 | dst = skb_dst(skb); |
1954 | sk = skb->sk; | |
1955 | xfrm_decode_session(skb, &fl, dst->ops->family); | |
1956 | spin_unlock(&pq->hold_queue.lock); | |
1957 | ||
1958 | dst_hold(dst->path); | |
3f5312ae | 1959 | dst = xfrm_lookup(net, dst->path, &fl, sk, 0); |
a0073fe1 SK |
1960 | if (IS_ERR(dst)) |
1961 | goto purge_queue; | |
1962 | ||
1963 | if (dst->flags & DST_XFRM_QUEUE) { | |
1964 | dst_release(dst); | |
1965 | ||
1966 | if (pq->timeout >= XFRM_QUEUE_TMO_MAX) | |
1967 | goto purge_queue; | |
1968 | ||
1969 | pq->timeout = pq->timeout << 1; | |
e7d8f6cb SK |
1970 | if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout)) |
1971 | xfrm_pol_hold(pol); | |
1972 | goto out; | |
a0073fe1 SK |
1973 | } |
1974 | ||
1975 | dst_release(dst); | |
1976 | ||
1977 | __skb_queue_head_init(&list); | |
1978 | ||
1979 | spin_lock(&pq->hold_queue.lock); | |
1980 | pq->timeout = 0; | |
1981 | skb_queue_splice_init(&pq->hold_queue, &list); | |
1982 | spin_unlock(&pq->hold_queue.lock); | |
1983 | ||
1984 | while (!skb_queue_empty(&list)) { | |
1985 | skb = __skb_dequeue(&list); | |
1986 | ||
1987 | xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family); | |
1988 | dst_hold(skb_dst(skb)->path); | |
3f5312ae | 1989 | dst = xfrm_lookup(net, skb_dst(skb)->path, &fl, skb->sk, 0); |
a0073fe1 | 1990 | if (IS_ERR(dst)) { |
a0073fe1 SK |
1991 | kfree_skb(skb); |
1992 | continue; | |
1993 | } | |
1994 | ||
1995 | nf_reset(skb); | |
1996 | skb_dst_drop(skb); | |
1997 | skb_dst_set(skb, dst); | |
1998 | ||
13206b6b | 1999 | dst_output(net, skb->sk, skb); |
a0073fe1 SK |
2000 | } |
2001 | ||
e7d8f6cb SK |
2002 | out: |
2003 | xfrm_pol_put(pol); | |
a0073fe1 SK |
2004 | return; |
2005 | ||
2006 | purge_queue: | |
2007 | pq->timeout = 0; | |
1ee5e667 | 2008 | skb_queue_purge(&pq->hold_queue); |
e7d8f6cb | 2009 | xfrm_pol_put(pol); |
a0073fe1 SK |
2010 | } |
2011 | ||
ede2059d | 2012 | static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
a0073fe1 SK |
2013 | { |
2014 | unsigned long sched_next; | |
2015 | struct dst_entry *dst = skb_dst(skb); | |
2016 | struct xfrm_dst *xdst = (struct xfrm_dst *) dst; | |
e7d8f6cb SK |
2017 | struct xfrm_policy *pol = xdst->pols[0]; |
2018 | struct xfrm_policy_queue *pq = &pol->polq; | |
4d53eff4 | 2019 | |
39bb5e62 | 2020 | if (unlikely(skb_fclone_busy(sk, skb))) { |
4d53eff4 SK |
2021 | kfree_skb(skb); |
2022 | return 0; | |
2023 | } | |
a0073fe1 SK |
2024 | |
2025 | if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) { | |
2026 | kfree_skb(skb); | |
2027 | return -EAGAIN; | |
2028 | } | |
2029 | ||
2030 | skb_dst_force(skb); | |
a0073fe1 SK |
2031 | |
2032 | spin_lock_bh(&pq->hold_queue.lock); | |
2033 | ||
2034 | if (!pq->timeout) | |
2035 | pq->timeout = XFRM_QUEUE_TMO_MIN; | |
2036 | ||
2037 | sched_next = jiffies + pq->timeout; | |
2038 | ||
2039 | if (del_timer(&pq->hold_timer)) { | |
2040 | if (time_before(pq->hold_timer.expires, sched_next)) | |
2041 | sched_next = pq->hold_timer.expires; | |
e7d8f6cb | 2042 | xfrm_pol_put(pol); |
a0073fe1 SK |
2043 | } |
2044 | ||
2045 | __skb_queue_tail(&pq->hold_queue, skb); | |
e7d8f6cb SK |
2046 | if (!mod_timer(&pq->hold_timer, sched_next)) |
2047 | xfrm_pol_hold(pol); | |
a0073fe1 SK |
2048 | |
2049 | spin_unlock_bh(&pq->hold_queue.lock); | |
2050 | ||
2051 | return 0; | |
2052 | } | |
2053 | ||
2054 | static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net, | |
b8c203b2 | 2055 | struct xfrm_flo *xflo, |
a0073fe1 SK |
2056 | const struct flowi *fl, |
2057 | int num_xfrms, | |
2058 | u16 family) | |
2059 | { | |
2060 | int err; | |
2061 | struct net_device *dev; | |
b8c203b2 | 2062 | struct dst_entry *dst; |
a0073fe1 SK |
2063 | struct dst_entry *dst1; |
2064 | struct xfrm_dst *xdst; | |
2065 | ||
2066 | xdst = xfrm_alloc_dst(net, family); | |
2067 | if (IS_ERR(xdst)) | |
2068 | return xdst; | |
2069 | ||
b8c203b2 SK |
2070 | if (!(xflo->flags & XFRM_LOOKUP_QUEUE) || |
2071 | net->xfrm.sysctl_larval_drop || | |
2072 | num_xfrms <= 0) | |
a0073fe1 SK |
2073 | return xdst; |
2074 | ||
b8c203b2 | 2075 | dst = xflo->dst_orig; |
a0073fe1 SK |
2076 | dst1 = &xdst->u.dst; |
2077 | dst_hold(dst); | |
2078 | xdst->route = dst; | |
2079 | ||
2080 | dst_copy_metrics(dst1, dst); | |
2081 | ||
2082 | dst1->obsolete = DST_OBSOLETE_FORCE_CHK; | |
2083 | dst1->flags |= DST_HOST | DST_XFRM_QUEUE; | |
2084 | dst1->lastuse = jiffies; | |
2085 | ||
2086 | dst1->input = dst_discard; | |
2087 | dst1->output = xdst_queue_output; | |
2088 | ||
2089 | dst_hold(dst); | |
2090 | dst1->child = dst; | |
2091 | dst1->path = dst; | |
2092 | ||
2093 | xfrm_init_path((struct xfrm_dst *)dst1, dst, 0); | |
2094 | ||
2095 | err = -ENODEV; | |
2096 | dev = dst->dev; | |
2097 | if (!dev) | |
2098 | goto free_dst; | |
2099 | ||
2100 | err = xfrm_fill_dst(xdst, dev, fl); | |
2101 | if (err) | |
2102 | goto free_dst; | |
2103 | ||
2104 | out: | |
2105 | return xdst; | |
2106 | ||
2107 | free_dst: | |
2108 | dst_release(dst1); | |
2109 | xdst = ERR_PTR(err); | |
2110 | goto out; | |
2111 | } | |
2112 | ||
80c802f3 | 2113 | static struct flow_cache_object * |
dee9f4bc | 2114 | xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir, |
80c802f3 TT |
2115 | struct flow_cache_object *oldflo, void *ctx) |
2116 | { | |
b8c203b2 | 2117 | struct xfrm_flo *xflo = (struct xfrm_flo *)ctx; |
80c802f3 TT |
2118 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2119 | struct xfrm_dst *xdst, *new_xdst; | |
2120 | int num_pols = 0, num_xfrms = 0, i, err, pol_dead; | |
2121 | ||
2122 | /* Check if the policies from old bundle are usable */ | |
2123 | xdst = NULL; | |
2124 | if (oldflo) { | |
2125 | xdst = container_of(oldflo, struct xfrm_dst, flo); | |
2126 | num_pols = xdst->num_pols; | |
2127 | num_xfrms = xdst->num_xfrms; | |
2128 | pol_dead = 0; | |
2129 | for (i = 0; i < num_pols; i++) { | |
2130 | pols[i] = xdst->pols[i]; | |
2131 | pol_dead |= pols[i]->walk.dead; | |
2132 | } | |
2133 | if (pol_dead) { | |
2134 | dst_free(&xdst->u.dst); | |
2135 | xdst = NULL; | |
2136 | num_pols = 0; | |
2137 | num_xfrms = 0; | |
2138 | oldflo = NULL; | |
2139 | } | |
2140 | } | |
2141 | ||
2142 | /* Resolve policies to use if we couldn't get them from | |
2143 | * previous cache entry */ | |
2144 | if (xdst == NULL) { | |
2145 | num_pols = 1; | |
b5fb82c4 BZ |
2146 | pols[0] = __xfrm_policy_lookup(net, fl, family, |
2147 | flow_to_policy_dir(dir)); | |
80c802f3 TT |
2148 | err = xfrm_expand_policies(fl, family, pols, |
2149 | &num_pols, &num_xfrms); | |
2150 | if (err < 0) | |
2151 | goto inc_error; | |
2152 | if (num_pols == 0) | |
2153 | return NULL; | |
2154 | if (num_xfrms <= 0) | |
2155 | goto make_dummy_bundle; | |
2156 | } | |
2157 | ||
b8c203b2 SK |
2158 | new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, |
2159 | xflo->dst_orig); | |
80c802f3 TT |
2160 | if (IS_ERR(new_xdst)) { |
2161 | err = PTR_ERR(new_xdst); | |
2162 | if (err != -EAGAIN) | |
2163 | goto error; | |
2164 | if (oldflo == NULL) | |
2165 | goto make_dummy_bundle; | |
2166 | dst_hold(&xdst->u.dst); | |
2167 | return oldflo; | |
d809ec89 TT |
2168 | } else if (new_xdst == NULL) { |
2169 | num_xfrms = 0; | |
2170 | if (oldflo == NULL) | |
2171 | goto make_dummy_bundle; | |
2172 | xdst->num_xfrms = 0; | |
2173 | dst_hold(&xdst->u.dst); | |
2174 | return oldflo; | |
80c802f3 TT |
2175 | } |
2176 | ||
2177 | /* Kill the previous bundle */ | |
2178 | if (xdst) { | |
2179 | /* The policies were stolen for newly generated bundle */ | |
2180 | xdst->num_pols = 0; | |
2181 | dst_free(&xdst->u.dst); | |
2182 | } | |
2183 | ||
2184 | /* Flow cache does not have reference, it dst_free()'s, | |
2185 | * but we do need to return one reference for original caller */ | |
2186 | dst_hold(&new_xdst->u.dst); | |
2187 | return &new_xdst->flo; | |
2188 | ||
2189 | make_dummy_bundle: | |
2190 | /* We found policies, but there's no bundles to instantiate: | |
2191 | * either because the policy blocks, has no transformations or | |
2192 | * we could not build template (no xfrm_states).*/ | |
b8c203b2 | 2193 | xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family); |
80c802f3 TT |
2194 | if (IS_ERR(xdst)) { |
2195 | xfrm_pols_put(pols, num_pols); | |
2196 | return ERR_CAST(xdst); | |
2197 | } | |
2198 | xdst->num_pols = num_pols; | |
2199 | xdst->num_xfrms = num_xfrms; | |
3e94c2dc | 2200 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 TT |
2201 | |
2202 | dst_hold(&xdst->u.dst); | |
2203 | return &xdst->flo; | |
2204 | ||
2205 | inc_error: | |
2206 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); | |
2207 | error: | |
2208 | if (xdst != NULL) | |
2209 | dst_free(&xdst->u.dst); | |
2210 | else | |
2211 | xfrm_pols_put(pols, num_pols); | |
2212 | return ERR_PTR(err); | |
2213 | } | |
1da177e4 | 2214 | |
2774c131 DM |
2215 | static struct dst_entry *make_blackhole(struct net *net, u16 family, |
2216 | struct dst_entry *dst_orig) | |
2217 | { | |
2218 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
2219 | struct dst_entry *ret; | |
2220 | ||
2221 | if (!afinfo) { | |
2222 | dst_release(dst_orig); | |
433a1954 | 2223 | return ERR_PTR(-EINVAL); |
2774c131 DM |
2224 | } else { |
2225 | ret = afinfo->blackhole_route(net, dst_orig); | |
2226 | } | |
2227 | xfrm_policy_put_afinfo(afinfo); | |
2228 | ||
2229 | return ret; | |
2230 | } | |
2231 | ||
1da177e4 LT |
2232 | /* Main function: finds/creates a bundle for given flow. |
2233 | * | |
2234 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
2235 | * on interfaces with disabled IPsec. | |
2236 | */ | |
452edd59 DM |
2237 | struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, |
2238 | const struct flowi *fl, | |
6f9c9615 | 2239 | const struct sock *sk, int flags) |
1da177e4 | 2240 | { |
4e81bb83 | 2241 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
80c802f3 TT |
2242 | struct flow_cache_object *flo; |
2243 | struct xfrm_dst *xdst; | |
452edd59 | 2244 | struct dst_entry *dst, *route; |
80c802f3 | 2245 | u16 family = dst_orig->ops->family; |
df71837d | 2246 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
4b021628 | 2247 | int i, err, num_pols, num_xfrms = 0, drop_pols = 0; |
e0d1caa7 | 2248 | |
80c802f3 TT |
2249 | dst = NULL; |
2250 | xdst = NULL; | |
2251 | route = NULL; | |
4e81bb83 | 2252 | |
bd5eb35f | 2253 | sk = sk_const_to_full_sk(sk); |
f7944fb1 | 2254 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
80c802f3 TT |
2255 | num_pols = 1; |
2256 | pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); | |
2257 | err = xfrm_expand_policies(fl, family, pols, | |
2258 | &num_pols, &num_xfrms); | |
2259 | if (err < 0) | |
75b8c133 | 2260 | goto dropdst; |
80c802f3 TT |
2261 | |
2262 | if (num_pols) { | |
2263 | if (num_xfrms <= 0) { | |
2264 | drop_pols = num_pols; | |
2265 | goto no_transform; | |
2266 | } | |
2267 | ||
2268 | xdst = xfrm_resolve_and_create_bundle( | |
2269 | pols, num_pols, fl, | |
2270 | family, dst_orig); | |
2271 | if (IS_ERR(xdst)) { | |
2272 | xfrm_pols_put(pols, num_pols); | |
2273 | err = PTR_ERR(xdst); | |
2274 | goto dropdst; | |
d809ec89 TT |
2275 | } else if (xdst == NULL) { |
2276 | num_xfrms = 0; | |
2277 | drop_pols = num_pols; | |
2278 | goto no_transform; | |
80c802f3 TT |
2279 | } |
2280 | ||
b7eea454 SK |
2281 | dst_hold(&xdst->u.dst); |
2282 | xdst->u.dst.flags |= DST_NOCACHE; | |
80c802f3 | 2283 | route = xdst->route; |
0aa64774 | 2284 | } |
3bccfbc7 | 2285 | } |
1da177e4 | 2286 | |
80c802f3 | 2287 | if (xdst == NULL) { |
b8c203b2 SK |
2288 | struct xfrm_flo xflo; |
2289 | ||
2290 | xflo.dst_orig = dst_orig; | |
2291 | xflo.flags = flags; | |
2292 | ||
1da177e4 | 2293 | /* To accelerate a bit... */ |
2518c7c2 | 2294 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 2295 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 2296 | goto nopol; |
1da177e4 | 2297 | |
80c802f3 | 2298 | flo = flow_cache_lookup(net, fl, family, dir, |
b8c203b2 | 2299 | xfrm_bundle_lookup, &xflo); |
80c802f3 TT |
2300 | if (flo == NULL) |
2301 | goto nopol; | |
fe1a5f03 | 2302 | if (IS_ERR(flo)) { |
80c802f3 | 2303 | err = PTR_ERR(flo); |
75b8c133 | 2304 | goto dropdst; |
d66e37a9 | 2305 | } |
80c802f3 TT |
2306 | xdst = container_of(flo, struct xfrm_dst, flo); |
2307 | ||
2308 | num_pols = xdst->num_pols; | |
2309 | num_xfrms = xdst->num_xfrms; | |
3e94c2dc | 2310 | memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 TT |
2311 | route = xdst->route; |
2312 | } | |
2313 | ||
2314 | dst = &xdst->u.dst; | |
2315 | if (route == NULL && num_xfrms > 0) { | |
2316 | /* The only case when xfrm_bundle_lookup() returns a | |
2317 | * bundle with null route, is when the template could | |
2318 | * not be resolved. It means policies are there, but | |
2319 | * bundle could not be created, since we don't yet | |
2320 | * have the xfrm_state's. We need to wait for KM to | |
2321 | * negotiate new SA's or bail out with error.*/ | |
2322 | if (net->xfrm.sysctl_larval_drop) { | |
80c802f3 | 2323 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
ac37e251 W |
2324 | err = -EREMOTE; |
2325 | goto error; | |
80c802f3 | 2326 | } |
80c802f3 | 2327 | |
5b8ef341 | 2328 | err = -EAGAIN; |
80c802f3 TT |
2329 | |
2330 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); | |
2331 | goto error; | |
1da177e4 LT |
2332 | } |
2333 | ||
80c802f3 TT |
2334 | no_transform: |
2335 | if (num_pols == 0) | |
8b7817f3 | 2336 | goto nopol; |
1da177e4 | 2337 | |
80c802f3 TT |
2338 | if ((flags & XFRM_LOOKUP_ICMP) && |
2339 | !(pols[0]->flags & XFRM_POLICY_ICMP)) { | |
2340 | err = -ENOENT; | |
8b7817f3 | 2341 | goto error; |
80c802f3 | 2342 | } |
8b7817f3 | 2343 | |
80c802f3 TT |
2344 | for (i = 0; i < num_pols; i++) |
2345 | pols[i]->curlft.use_time = get_seconds(); | |
8b7817f3 | 2346 | |
80c802f3 | 2347 | if (num_xfrms < 0) { |
1da177e4 | 2348 | /* Prohibit the flow */ |
59c9940e | 2349 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
2350 | err = -EPERM; |
2351 | goto error; | |
80c802f3 TT |
2352 | } else if (num_xfrms > 0) { |
2353 | /* Flow transformed */ | |
80c802f3 TT |
2354 | dst_release(dst_orig); |
2355 | } else { | |
2356 | /* Flow passes untransformed */ | |
2357 | dst_release(dst); | |
452edd59 | 2358 | dst = dst_orig; |
1da177e4 | 2359 | } |
80c802f3 TT |
2360 | ok: |
2361 | xfrm_pols_put(pols, drop_pols); | |
0c183379 G |
2362 | if (dst && dst->xfrm && |
2363 | dst->xfrm->props.mode == XFRM_MODE_TUNNEL) | |
2364 | dst->flags |= DST_XFRM_TUNNEL; | |
452edd59 | 2365 | return dst; |
1da177e4 | 2366 | |
80c802f3 | 2367 | nopol: |
452edd59 DM |
2368 | if (!(flags & XFRM_LOOKUP_ICMP)) { |
2369 | dst = dst_orig; | |
80c802f3 | 2370 | goto ok; |
452edd59 | 2371 | } |
80c802f3 | 2372 | err = -ENOENT; |
1da177e4 | 2373 | error: |
80c802f3 | 2374 | dst_release(dst); |
75b8c133 | 2375 | dropdst: |
ac37e251 W |
2376 | if (!(flags & XFRM_LOOKUP_KEEP_DST_REF)) |
2377 | dst_release(dst_orig); | |
80c802f3 | 2378 | xfrm_pols_put(pols, drop_pols); |
452edd59 | 2379 | return ERR_PTR(err); |
1da177e4 LT |
2380 | } |
2381 | EXPORT_SYMBOL(xfrm_lookup); | |
2382 | ||
f92ee619 SK |
2383 | /* Callers of xfrm_lookup_route() must ensure a call to dst_output(). |
2384 | * Otherwise we may send out blackholed packets. | |
2385 | */ | |
2386 | struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig, | |
2387 | const struct flowi *fl, | |
6f9c9615 | 2388 | const struct sock *sk, int flags) |
f92ee619 | 2389 | { |
b8c203b2 | 2390 | struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk, |
ac37e251 W |
2391 | flags | XFRM_LOOKUP_QUEUE | |
2392 | XFRM_LOOKUP_KEEP_DST_REF); | |
f92ee619 SK |
2393 | |
2394 | if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE) | |
2395 | return make_blackhole(net, dst_orig->ops->family, dst_orig); | |
2396 | ||
2397 | return dst; | |
2398 | } | |
2399 | EXPORT_SYMBOL(xfrm_lookup_route); | |
2400 | ||
df0ba92a | 2401 | static inline int |
8f029de2 | 2402 | xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl) |
df0ba92a MN |
2403 | { |
2404 | struct xfrm_state *x; | |
df0ba92a MN |
2405 | |
2406 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
2407 | return 0; | |
2408 | x = skb->sp->xvec[idx]; | |
2409 | if (!x->type->reject) | |
2410 | return 0; | |
1ecafede | 2411 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
2412 | } |
2413 | ||
1da177e4 LT |
2414 | /* When skb is transformed back to its "native" form, we have to |
2415 | * check policy restrictions. At the moment we make this in maximally | |
2416 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
2417 | * have policy cached at them. | |
2418 | */ | |
2419 | ||
2420 | static inline int | |
7db454b9 | 2421 | xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, |
1da177e4 LT |
2422 | unsigned short family) |
2423 | { | |
2424 | if (xfrm_state_kern(x)) | |
928ba416 | 2425 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
2426 | return x->id.proto == tmpl->id.proto && |
2427 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
2428 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
2429 | x->props.mode == tmpl->mode && | |
c5d18e98 | 2430 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 2431 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
2432 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
2433 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
2434 | } |
2435 | ||
df0ba92a MN |
2436 | /* |
2437 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
2438 | * because of optional transport mode, or next index of the mathced secpath | |
2439 | * state with the template. | |
2440 | * -1 is returned when no matching template is found. | |
2441 | * Otherwise "-2 - errored_index" is returned. | |
2442 | */ | |
1da177e4 | 2443 | static inline int |
22cccb7e | 2444 | xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start, |
1da177e4 LT |
2445 | unsigned short family) |
2446 | { | |
2447 | int idx = start; | |
2448 | ||
2449 | if (tmpl->optional) { | |
7e49e6de | 2450 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
2451 | return start; |
2452 | } else | |
2453 | start = -1; | |
2454 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 2455 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 2456 | return ++idx; |
df0ba92a MN |
2457 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
2458 | if (start == -1) | |
2459 | start = -2-idx; | |
1da177e4 | 2460 | break; |
df0ba92a | 2461 | } |
1da177e4 LT |
2462 | } |
2463 | return start; | |
2464 | } | |
2465 | ||
d5422efe HX |
2466 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
2467 | unsigned int family, int reverse) | |
1da177e4 LT |
2468 | { |
2469 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 2470 | int err; |
1da177e4 LT |
2471 | |
2472 | if (unlikely(afinfo == NULL)) | |
2473 | return -EAFNOSUPPORT; | |
2474 | ||
d5422efe | 2475 | afinfo->decode_session(skb, fl, reverse); |
1d28f42c | 2476 | err = security_xfrm_decode_session(skb, &fl->flowi_secid); |
1da177e4 | 2477 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 2478 | return err; |
1da177e4 | 2479 | } |
d5422efe | 2480 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 2481 | |
9a7386ec | 2482 | static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
2483 | { |
2484 | for (; k < sp->len; k++) { | |
df0ba92a | 2485 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 2486 | *idxp = k; |
1da177e4 | 2487 | return 1; |
df0ba92a | 2488 | } |
1da177e4 LT |
2489 | } |
2490 | ||
2491 | return 0; | |
2492 | } | |
2493 | ||
a716c119 | 2494 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
2495 | unsigned short family) |
2496 | { | |
f6e1e25d | 2497 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2498 | struct xfrm_policy *pol; |
4e81bb83 MN |
2499 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2500 | int npols = 0; | |
2501 | int xfrm_nr; | |
2502 | int pi; | |
d5422efe | 2503 | int reverse; |
1da177e4 | 2504 | struct flowi fl; |
d5422efe | 2505 | u8 fl_dir; |
df0ba92a | 2506 | int xerr_idx = -1; |
1da177e4 | 2507 | |
d5422efe HX |
2508 | reverse = dir & ~XFRM_POLICY_MASK; |
2509 | dir &= XFRM_POLICY_MASK; | |
2510 | fl_dir = policy_to_flow_dir(dir); | |
2511 | ||
0aa64774 | 2512 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 2513 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 2514 | return 0; |
0aa64774 MN |
2515 | } |
2516 | ||
eb9c7ebe | 2517 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
2518 | |
2519 | /* First, check used SA against their selectors. */ | |
2520 | if (skb->sp) { | |
2521 | int i; | |
2522 | ||
9b7a787d | 2523 | for (i = skb->sp->len-1; i >= 0; i--) { |
dbe5b4aa | 2524 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 2525 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 2526 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 2527 | return 0; |
0aa64774 | 2528 | } |
1da177e4 LT |
2529 | } |
2530 | } | |
2531 | ||
2532 | pol = NULL; | |
bd5eb35f | 2533 | sk = sk_to_full_sk(sk); |
3bccfbc7 | 2534 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 2535 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 2536 | if (IS_ERR(pol)) { |
59c9940e | 2537 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 2538 | return 0; |
0aa64774 | 2539 | } |
3bccfbc7 | 2540 | } |
1da177e4 | 2541 | |
fe1a5f03 TT |
2542 | if (!pol) { |
2543 | struct flow_cache_object *flo; | |
2544 | ||
2545 | flo = flow_cache_lookup(net, &fl, family, fl_dir, | |
2546 | xfrm_policy_lookup, NULL); | |
2547 | if (IS_ERR_OR_NULL(flo)) | |
2548 | pol = ERR_CAST(flo); | |
2549 | else | |
2550 | pol = container_of(flo, struct xfrm_policy, flo); | |
2551 | } | |
1da177e4 | 2552 | |
0aa64774 | 2553 | if (IS_ERR(pol)) { |
59c9940e | 2554 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2555 | return 0; |
0aa64774 | 2556 | } |
134b0fc5 | 2557 | |
df0ba92a | 2558 | if (!pol) { |
d1d9facf | 2559 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 2560 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 2561 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
2562 | return 0; |
2563 | } | |
2564 | return 1; | |
2565 | } | |
1da177e4 | 2566 | |
9d729f72 | 2567 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 2568 | |
4e81bb83 | 2569 | pols[0] = pol; |
02d0892f | 2570 | npols++; |
4e81bb83 MN |
2571 | #ifdef CONFIG_XFRM_SUB_POLICY |
2572 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 2573 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
2574 | &fl, family, |
2575 | XFRM_POLICY_IN); | |
2576 | if (pols[1]) { | |
0aa64774 | 2577 | if (IS_ERR(pols[1])) { |
59c9940e | 2578 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2579 | return 0; |
0aa64774 | 2580 | } |
9d729f72 | 2581 | pols[1]->curlft.use_time = get_seconds(); |
02d0892f | 2582 | npols++; |
4e81bb83 MN |
2583 | } |
2584 | } | |
2585 | #endif | |
2586 | ||
1da177e4 LT |
2587 | if (pol->action == XFRM_POLICY_ALLOW) { |
2588 | struct sec_path *sp; | |
2589 | static struct sec_path dummy; | |
4e81bb83 | 2590 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 2591 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
2592 | struct xfrm_tmpl **tpp = tp; |
2593 | int ti = 0; | |
1da177e4 LT |
2594 | int i, k; |
2595 | ||
2596 | if ((sp = skb->sp) == NULL) | |
2597 | sp = &dummy; | |
2598 | ||
4e81bb83 MN |
2599 | for (pi = 0; pi < npols; pi++) { |
2600 | if (pols[pi] != pol && | |
0aa64774 | 2601 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 2602 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 2603 | goto reject; |
0aa64774 MN |
2604 | } |
2605 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 2606 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 2607 | goto reject_error; |
0aa64774 | 2608 | } |
4e81bb83 MN |
2609 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2610 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2611 | } | |
2612 | xfrm_nr = ti; | |
41a49cc3 | 2613 | if (npols > 1) { |
283bc9f3 | 2614 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net); |
41a49cc3 MN |
2615 | tpp = stp; |
2616 | } | |
4e81bb83 | 2617 | |
1da177e4 LT |
2618 | /* For each tunnel xfrm, find the first matching tmpl. |
2619 | * For each tmpl before that, find corresponding xfrm. | |
2620 | * Order is _important_. Later we will implement | |
2621 | * some barriers, but at the moment barriers | |
2622 | * are implied between each two transformations. | |
2623 | */ | |
4e81bb83 MN |
2624 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2625 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2626 | if (k < 0) { |
d1d9facf JM |
2627 | if (k < -1) |
2628 | /* "-2 - errored_index" returned */ | |
2629 | xerr_idx = -(2+k); | |
59c9940e | 2630 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2631 | goto reject; |
df0ba92a | 2632 | } |
1da177e4 LT |
2633 | } |
2634 | ||
0aa64774 | 2635 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2636 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2637 | goto reject; |
0aa64774 | 2638 | } |
1da177e4 | 2639 | |
4e81bb83 | 2640 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2641 | return 1; |
2642 | } | |
59c9940e | 2643 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2644 | |
2645 | reject: | |
df0ba92a | 2646 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2647 | reject_error: |
2648 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2649 | return 0; |
2650 | } | |
2651 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2652 | ||
2653 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2654 | { | |
99a66657 | 2655 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2656 | struct flowi fl; |
adf30907 | 2657 | struct dst_entry *dst; |
73137147 | 2658 | int res = 1; |
1da177e4 | 2659 | |
0aa64774 | 2660 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
72032fdb | 2661 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
1da177e4 | 2662 | return 0; |
0aa64774 | 2663 | } |
1da177e4 | 2664 | |
fafeeb6c | 2665 | skb_dst_force(skb); |
adf30907 | 2666 | |
b8c203b2 | 2667 | dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE); |
452edd59 | 2668 | if (IS_ERR(dst)) { |
73137147 | 2669 | res = 0; |
452edd59 DM |
2670 | dst = NULL; |
2671 | } | |
adf30907 ED |
2672 | skb_dst_set(skb, dst); |
2673 | return res; | |
1da177e4 LT |
2674 | } |
2675 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2676 | ||
d49c73c7 DM |
2677 | /* Optimize later using cookies and generation ids. */ |
2678 | ||
1da177e4 LT |
2679 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2680 | { | |
d49c73c7 | 2681 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
f5b0a874 DM |
2682 | * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to |
2683 | * get validated by dst_ops->check on every use. We do this | |
2684 | * because when a normal route referenced by an XFRM dst is | |
2685 | * obsoleted we do not go looking around for all parent | |
2686 | * referencing XFRM dsts so that we can invalidate them. It | |
2687 | * is just too much work. Instead we make the checks here on | |
2688 | * every use. For example: | |
d49c73c7 DM |
2689 | * |
2690 | * XFRM dst A --> IPv4 dst X | |
2691 | * | |
2692 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2693 | * in this example). If X is marked obsolete, "A" will not | |
2694 | * notice. That's what we are validating here via the | |
2695 | * stale_bundle() check. | |
2696 | * | |
2697 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
f5b0a874 DM |
2698 | * dst which causes it's ->obsolete field to be set to |
2699 | * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like | |
2700 | * this, we want to force a new route lookup. | |
399c180a | 2701 | */ |
d49c73c7 DM |
2702 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2703 | return dst; | |
2704 | ||
1da177e4 LT |
2705 | return NULL; |
2706 | } | |
2707 | ||
2708 | static int stale_bundle(struct dst_entry *dst) | |
2709 | { | |
12fdb4d3 | 2710 | return !xfrm_bundle_ok((struct xfrm_dst *)dst); |
1da177e4 LT |
2711 | } |
2712 | ||
aabc9761 | 2713 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2714 | { |
1da177e4 | 2715 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2716 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2717 | dev_hold(dst->dev); |
1da177e4 LT |
2718 | dev_put(dev); |
2719 | } | |
2720 | } | |
aabc9761 | 2721 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2722 | |
2723 | static void xfrm_link_failure(struct sk_buff *skb) | |
2724 | { | |
2725 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1da177e4 LT |
2726 | } |
2727 | ||
2728 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2729 | { | |
2730 | if (dst) { | |
2731 | if (dst->obsolete) { | |
2732 | dst_release(dst); | |
2733 | dst = NULL; | |
2734 | } | |
2735 | } | |
2736 | return dst; | |
2737 | } | |
2738 | ||
e4c17216 | 2739 | void xfrm_garbage_collect(struct net *net) |
c0ed1c14 | 2740 | { |
ca925cf1 | 2741 | flow_cache_flush(net); |
c0ed1c14 | 2742 | } |
e4c17216 | 2743 | EXPORT_SYMBOL(xfrm_garbage_collect); |
c0ed1c14 SK |
2744 | |
2745 | static void xfrm_garbage_collect_deferred(struct net *net) | |
2746 | { | |
ca925cf1 | 2747 | flow_cache_flush_deferred(net); |
c0ed1c14 SK |
2748 | } |
2749 | ||
25ee3286 | 2750 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2751 | { |
2752 | do { | |
2753 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2754 | u32 pmtu, route_mtu_cached; | |
2755 | ||
2756 | pmtu = dst_mtu(dst->child); | |
2757 | xdst->child_mtu_cached = pmtu; | |
2758 | ||
2759 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2760 | ||
2761 | route_mtu_cached = dst_mtu(xdst->route); | |
2762 | xdst->route_mtu_cached = route_mtu_cached; | |
2763 | ||
2764 | if (pmtu > route_mtu_cached) | |
2765 | pmtu = route_mtu_cached; | |
2766 | ||
defb3519 | 2767 | dst_metric_set(dst, RTAX_MTU, pmtu); |
1da177e4 LT |
2768 | } while ((dst = dst->next)); |
2769 | } | |
2770 | ||
1da177e4 LT |
2771 | /* Check that the bundle accepts the flow and its components are |
2772 | * still valid. | |
2773 | */ | |
2774 | ||
12fdb4d3 | 2775 | static int xfrm_bundle_ok(struct xfrm_dst *first) |
1da177e4 LT |
2776 | { |
2777 | struct dst_entry *dst = &first->u.dst; | |
2778 | struct xfrm_dst *last; | |
2779 | u32 mtu; | |
2780 | ||
92d63dec | 2781 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2782 | (dst->dev && !netif_running(dst->dev))) |
2783 | return 0; | |
2784 | ||
a0073fe1 SK |
2785 | if (dst->flags & DST_XFRM_QUEUE) |
2786 | return 1; | |
2787 | ||
1da177e4 LT |
2788 | last = NULL; |
2789 | ||
2790 | do { | |
2791 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2792 | ||
1da177e4 LT |
2793 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2794 | return 0; | |
80c802f3 TT |
2795 | if (xdst->xfrm_genid != dst->xfrm->genid) |
2796 | return 0; | |
b1312c89 TT |
2797 | if (xdst->num_pols > 0 && |
2798 | xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) | |
9d4a706d | 2799 | return 0; |
e53820de | 2800 | |
1da177e4 LT |
2801 | mtu = dst_mtu(dst->child); |
2802 | if (xdst->child_mtu_cached != mtu) { | |
2803 | last = xdst; | |
2804 | xdst->child_mtu_cached = mtu; | |
2805 | } | |
2806 | ||
92d63dec | 2807 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2808 | return 0; |
2809 | mtu = dst_mtu(xdst->route); | |
2810 | if (xdst->route_mtu_cached != mtu) { | |
2811 | last = xdst; | |
2812 | xdst->route_mtu_cached = mtu; | |
2813 | } | |
2814 | ||
2815 | dst = dst->child; | |
2816 | } while (dst->xfrm); | |
2817 | ||
2818 | if (likely(!last)) | |
2819 | return 1; | |
2820 | ||
2821 | mtu = last->child_mtu_cached; | |
2822 | for (;;) { | |
2823 | dst = &last->u.dst; | |
2824 | ||
2825 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2826 | if (mtu > last->route_mtu_cached) | |
2827 | mtu = last->route_mtu_cached; | |
defb3519 | 2828 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
2829 | |
2830 | if (last == first) | |
2831 | break; | |
2832 | ||
bd0bf076 | 2833 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2834 | last->child_mtu_cached = mtu; |
2835 | } | |
2836 | ||
2837 | return 1; | |
2838 | } | |
2839 | ||
0dbaee3b DM |
2840 | static unsigned int xfrm_default_advmss(const struct dst_entry *dst) |
2841 | { | |
2842 | return dst_metric_advmss(dst->path); | |
2843 | } | |
2844 | ||
ebb762f2 | 2845 | static unsigned int xfrm_mtu(const struct dst_entry *dst) |
d33e4553 | 2846 | { |
618f9bc7 SK |
2847 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2848 | ||
2849 | return mtu ? : dst_mtu(dst->path); | |
d33e4553 DM |
2850 | } |
2851 | ||
f894cbf8 DM |
2852 | static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, |
2853 | struct sk_buff *skb, | |
2854 | const void *daddr) | |
d3aaeb38 | 2855 | { |
f894cbf8 | 2856 | return dst->path->ops->neigh_lookup(dst, skb, daddr); |
d3aaeb38 DM |
2857 | } |
2858 | ||
1da177e4 LT |
2859 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2860 | { | |
2861 | int err = 0; | |
2862 | if (unlikely(afinfo == NULL)) | |
2863 | return -EINVAL; | |
2864 | if (unlikely(afinfo->family >= NPROTO)) | |
2865 | return -EAFNOSUPPORT; | |
ef8531b6 | 2866 | spin_lock(&xfrm_policy_afinfo_lock); |
1da177e4 | 2867 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
f31e8d4f | 2868 | err = -EEXIST; |
1da177e4 LT |
2869 | else { |
2870 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2871 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2872 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2873 | if (likely(dst_ops->check == NULL)) | |
2874 | dst_ops->check = xfrm_dst_check; | |
0dbaee3b DM |
2875 | if (likely(dst_ops->default_advmss == NULL)) |
2876 | dst_ops->default_advmss = xfrm_default_advmss; | |
ebb762f2 SK |
2877 | if (likely(dst_ops->mtu == NULL)) |
2878 | dst_ops->mtu = xfrm_mtu; | |
1da177e4 LT |
2879 | if (likely(dst_ops->negative_advice == NULL)) |
2880 | dst_ops->negative_advice = xfrm_negative_advice; | |
2881 | if (likely(dst_ops->link_failure == NULL)) | |
2882 | dst_ops->link_failure = xfrm_link_failure; | |
d3aaeb38 DM |
2883 | if (likely(dst_ops->neigh_lookup == NULL)) |
2884 | dst_ops->neigh_lookup = xfrm_neigh_lookup; | |
1da177e4 | 2885 | if (likely(afinfo->garbage_collect == NULL)) |
c0ed1c14 | 2886 | afinfo->garbage_collect = xfrm_garbage_collect_deferred; |
418a99ac | 2887 | rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo); |
1da177e4 | 2888 | } |
ef8531b6 | 2889 | spin_unlock(&xfrm_policy_afinfo_lock); |
d7c7544c | 2890 | |
1da177e4 LT |
2891 | return err; |
2892 | } | |
2893 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2894 | ||
2895 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2896 | { | |
2897 | int err = 0; | |
2898 | if (unlikely(afinfo == NULL)) | |
2899 | return -EINVAL; | |
2900 | if (unlikely(afinfo->family >= NPROTO)) | |
2901 | return -EAFNOSUPPORT; | |
ef8531b6 | 2902 | spin_lock(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2903 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2904 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2905 | err = -EINVAL; | |
ef8531b6 ED |
2906 | else |
2907 | RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family], | |
2908 | NULL); | |
2909 | } | |
2910 | spin_unlock(&xfrm_policy_afinfo_lock); | |
2911 | if (!err) { | |
2912 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2913 | ||
2914 | synchronize_rcu(); | |
2915 | ||
2916 | dst_ops->kmem_cachep = NULL; | |
2917 | dst_ops->check = NULL; | |
2918 | dst_ops->negative_advice = NULL; | |
2919 | dst_ops->link_failure = NULL; | |
2920 | afinfo->garbage_collect = NULL; | |
1da177e4 | 2921 | } |
1da177e4 LT |
2922 | return err; |
2923 | } | |
2924 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2925 | ||
1da177e4 LT |
2926 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2927 | { | |
351638e7 | 2928 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
e9dc8653 | 2929 | |
1da177e4 LT |
2930 | switch (event) { |
2931 | case NETDEV_DOWN: | |
c0ed1c14 | 2932 | xfrm_garbage_collect(dev_net(dev)); |
1da177e4 LT |
2933 | } |
2934 | return NOTIFY_DONE; | |
2935 | } | |
2936 | ||
2937 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2938 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2939 | }; |
2940 | ||
558f82ef | 2941 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2942 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2943 | { |
c68cd1a0 | 2944 | int rv; |
698365fa WC |
2945 | net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib); |
2946 | if (!net->mib.xfrm_statistics) | |
558f82ef | 2947 | return -ENOMEM; |
c68cd1a0 AD |
2948 | rv = xfrm_proc_init(net); |
2949 | if (rv < 0) | |
698365fa | 2950 | free_percpu(net->mib.xfrm_statistics); |
c68cd1a0 | 2951 | return rv; |
558f82ef | 2952 | } |
59c9940e AD |
2953 | |
2954 | static void xfrm_statistics_fini(struct net *net) | |
2955 | { | |
c68cd1a0 | 2956 | xfrm_proc_fini(net); |
698365fa | 2957 | free_percpu(net->mib.xfrm_statistics); |
59c9940e AD |
2958 | } |
2959 | #else | |
2960 | static int __net_init xfrm_statistics_init(struct net *net) | |
2961 | { | |
2962 | return 0; | |
2963 | } | |
2964 | ||
2965 | static void xfrm_statistics_fini(struct net *net) | |
2966 | { | |
2967 | } | |
558f82ef MN |
2968 | #endif |
2969 | ||
d62ddc21 | 2970 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2971 | { |
2518c7c2 DM |
2972 | unsigned int hmask, sz; |
2973 | int dir; | |
2974 | ||
d62ddc21 AD |
2975 | if (net_eq(net, &init_net)) |
2976 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2977 | sizeof(struct xfrm_dst), |
e5d679f3 | 2978 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2979 | NULL); |
1da177e4 | 2980 | |
2518c7c2 DM |
2981 | hmask = 8 - 1; |
2982 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2983 | ||
93b851c1 AD |
2984 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2985 | if (!net->xfrm.policy_byidx) | |
2986 | goto out_byidx; | |
8100bea7 | 2987 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 | 2988 | |
53c2e285 | 2989 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
2990 | struct xfrm_policy_hash *htab; |
2991 | ||
dc2caba7 | 2992 | net->xfrm.policy_count[dir] = 0; |
53c2e285 | 2993 | net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0; |
8b18f8ea | 2994 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2995 | |
a35f6c5d | 2996 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2997 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2998 | if (!htab->table) |
a35f6c5d AD |
2999 | goto out_bydst; |
3000 | htab->hmask = hmask; | |
b58555f1 CG |
3001 | htab->dbits4 = 32; |
3002 | htab->sbits4 = 32; | |
3003 | htab->dbits6 = 128; | |
3004 | htab->sbits6 = 128; | |
2518c7c2 | 3005 | } |
880a6fab CG |
3006 | net->xfrm.policy_hthresh.lbits4 = 32; |
3007 | net->xfrm.policy_hthresh.rbits4 = 32; | |
3008 | net->xfrm.policy_hthresh.lbits6 = 128; | |
3009 | net->xfrm.policy_hthresh.rbits6 = 128; | |
3010 | ||
3011 | seqlock_init(&net->xfrm.policy_hthresh.lock); | |
2518c7c2 | 3012 | |
adfcf0b2 | 3013 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 3014 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
880a6fab | 3015 | INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild); |
d62ddc21 AD |
3016 | if (net_eq(net, &init_net)) |
3017 | register_netdevice_notifier(&xfrm_dev_notifier); | |
3018 | return 0; | |
93b851c1 | 3019 | |
a35f6c5d AD |
3020 | out_bydst: |
3021 | for (dir--; dir >= 0; dir--) { | |
3022 | struct xfrm_policy_hash *htab; | |
3023 | ||
3024 | htab = &net->xfrm.policy_bydst[dir]; | |
3025 | xfrm_hash_free(htab->table, sz); | |
3026 | } | |
3027 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
3028 | out_byidx: |
3029 | return -ENOMEM; | |
d62ddc21 AD |
3030 | } |
3031 | ||
3032 | static void xfrm_policy_fini(struct net *net) | |
3033 | { | |
93b851c1 | 3034 | unsigned int sz; |
8b18f8ea | 3035 | int dir; |
93b851c1 | 3036 | |
7c2776ee AD |
3037 | flush_work(&net->xfrm.policy_hash_work); |
3038 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2e71029e | 3039 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false); |
7c2776ee | 3040 | #endif |
2e71029e | 3041 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false); |
7c2776ee | 3042 | |
adfcf0b2 | 3043 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 3044 | |
53c2e285 | 3045 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
a35f6c5d AD |
3046 | struct xfrm_policy_hash *htab; |
3047 | ||
8b18f8ea | 3048 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
3049 | |
3050 | htab = &net->xfrm.policy_bydst[dir]; | |
5b653b2a | 3051 | sz = (htab->hmask + 1) * sizeof(struct hlist_head); |
a35f6c5d AD |
3052 | WARN_ON(!hlist_empty(htab->table)); |
3053 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
3054 | } |
3055 | ||
8100bea7 | 3056 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
3057 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
3058 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
3059 | } |
3060 | ||
d62ddc21 AD |
3061 | static int __net_init xfrm_net_init(struct net *net) |
3062 | { | |
3063 | int rv; | |
3064 | ||
59c9940e AD |
3065 | rv = xfrm_statistics_init(net); |
3066 | if (rv < 0) | |
3067 | goto out_statistics; | |
d62ddc21 AD |
3068 | rv = xfrm_state_init(net); |
3069 | if (rv < 0) | |
3070 | goto out_state; | |
3071 | rv = xfrm_policy_init(net); | |
3072 | if (rv < 0) | |
3073 | goto out_policy; | |
b27aeadb AD |
3074 | rv = xfrm_sysctl_init(net); |
3075 | if (rv < 0) | |
3076 | goto out_sysctl; | |
4a93f509 SK |
3077 | rv = flow_cache_init(net); |
3078 | if (rv < 0) | |
3079 | goto out; | |
283bc9f3 FD |
3080 | |
3081 | /* Initialize the per-net locks here */ | |
3082 | spin_lock_init(&net->xfrm.xfrm_state_lock); | |
9d0380df | 3083 | spin_lock_init(&net->xfrm.xfrm_policy_lock); |
283bc9f3 FD |
3084 | mutex_init(&net->xfrm.xfrm_cfg_mutex); |
3085 | ||
d62ddc21 AD |
3086 | return 0; |
3087 | ||
4a93f509 SK |
3088 | out: |
3089 | xfrm_sysctl_fini(net); | |
b27aeadb AD |
3090 | out_sysctl: |
3091 | xfrm_policy_fini(net); | |
d62ddc21 AD |
3092 | out_policy: |
3093 | xfrm_state_fini(net); | |
3094 | out_state: | |
59c9940e AD |
3095 | xfrm_statistics_fini(net); |
3096 | out_statistics: | |
d62ddc21 AD |
3097 | return rv; |
3098 | } | |
3099 | ||
3100 | static void __net_exit xfrm_net_exit(struct net *net) | |
3101 | { | |
4a93f509 | 3102 | flow_cache_fini(net); |
b27aeadb | 3103 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
3104 | xfrm_policy_fini(net); |
3105 | xfrm_state_fini(net); | |
59c9940e | 3106 | xfrm_statistics_fini(net); |
d62ddc21 AD |
3107 | } |
3108 | ||
3109 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
3110 | .init = xfrm_net_init, | |
3111 | .exit = xfrm_net_exit, | |
3112 | }; | |
3113 | ||
1da177e4 LT |
3114 | void __init xfrm_init(void) |
3115 | { | |
a4fc1bfc | 3116 | flow_cache_hp_init(); |
d62ddc21 | 3117 | register_pernet_subsys(&xfrm_net_ops); |
30846090 | 3118 | seqcount_init(&xfrm_policy_hash_generation); |
1da177e4 LT |
3119 | xfrm_input_init(); |
3120 | } | |
3121 | ||
ab5f5e8b | 3122 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
3123 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
3124 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 3125 | { |
875179fa PM |
3126 | struct xfrm_sec_ctx *ctx = xp->security; |
3127 | struct xfrm_selector *sel = &xp->selector; | |
3128 | ||
3129 | if (ctx) | |
ab5f5e8b | 3130 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 3131 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 3132 | |
9b7a787d | 3133 | switch (sel->family) { |
ab5f5e8b | 3134 | case AF_INET: |
21454aaa | 3135 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
3136 | if (sel->prefixlen_s != 32) |
3137 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
3138 | sel->prefixlen_s); | |
21454aaa | 3139 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
3140 | if (sel->prefixlen_d != 32) |
3141 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
3142 | sel->prefixlen_d); | |
ab5f5e8b JL |
3143 | break; |
3144 | case AF_INET6: | |
5b095d98 | 3145 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
3146 | if (sel->prefixlen_s != 128) |
3147 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
3148 | sel->prefixlen_s); | |
5b095d98 | 3149 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
3150 | if (sel->prefixlen_d != 128) |
3151 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
3152 | sel->prefixlen_d); | |
ab5f5e8b JL |
3153 | break; |
3154 | } | |
3155 | } | |
3156 | ||
2e71029e | 3157 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid) |
ab5f5e8b JL |
3158 | { |
3159 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 3160 | |
afeb14b4 | 3161 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
3162 | if (audit_buf == NULL) |
3163 | return; | |
2e71029e | 3164 | xfrm_audit_helper_usrinfo(task_valid, audit_buf); |
afeb14b4 | 3165 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
3166 | xfrm_audit_common_policyinfo(xp, audit_buf); |
3167 | audit_log_end(audit_buf); | |
3168 | } | |
3169 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
3170 | ||
68277acc | 3171 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2e71029e | 3172 | bool task_valid) |
ab5f5e8b JL |
3173 | { |
3174 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 3175 | |
afeb14b4 | 3176 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
3177 | if (audit_buf == NULL) |
3178 | return; | |
2e71029e | 3179 | xfrm_audit_helper_usrinfo(task_valid, audit_buf); |
afeb14b4 | 3180 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
3181 | xfrm_audit_common_policyinfo(xp, audit_buf); |
3182 | audit_log_end(audit_buf); | |
3183 | } | |
3184 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
3185 | #endif | |
3186 | ||
80c9abaa | 3187 | #ifdef CONFIG_XFRM_MIGRATE |
bc9b35ad DM |
3188 | static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp, |
3189 | const struct xfrm_selector *sel_tgt) | |
80c9abaa SS |
3190 | { |
3191 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
3192 | if (sel_tgt->family == sel_cmp->family && | |
70e94e66 YH |
3193 | xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr, |
3194 | sel_cmp->family) && | |
3195 | xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr, | |
3196 | sel_cmp->family) && | |
80c9abaa SS |
3197 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && |
3198 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
bc9b35ad | 3199 | return true; |
80c9abaa SS |
3200 | } |
3201 | } else { | |
3202 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
bc9b35ad | 3203 | return true; |
80c9abaa SS |
3204 | } |
3205 | } | |
bc9b35ad | 3206 | return false; |
80c9abaa SS |
3207 | } |
3208 | ||
3e94c2dc WC |
3209 | static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel, |
3210 | u8 dir, u8 type, struct net *net) | |
80c9abaa SS |
3211 | { |
3212 | struct xfrm_policy *pol, *ret = NULL; | |
80c9abaa SS |
3213 | struct hlist_head *chain; |
3214 | u32 priority = ~0U; | |
3215 | ||
9d0380df | 3216 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
8d549c4f | 3217 | chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir); |
b67bfe0d | 3218 | hlist_for_each_entry(pol, chain, bydst) { |
80c9abaa SS |
3219 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
3220 | pol->type == type) { | |
3221 | ret = pol; | |
3222 | priority = ret->priority; | |
3223 | break; | |
3224 | } | |
3225 | } | |
8d549c4f | 3226 | chain = &net->xfrm.policy_inexact[dir]; |
b67bfe0d | 3227 | hlist_for_each_entry(pol, chain, bydst) { |
8faf491e LR |
3228 | if ((pol->priority >= priority) && ret) |
3229 | break; | |
3230 | ||
80c9abaa | 3231 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
8faf491e | 3232 | pol->type == type) { |
80c9abaa SS |
3233 | ret = pol; |
3234 | break; | |
3235 | } | |
3236 | } | |
3237 | ||
586f2eb4 | 3238 | xfrm_pol_hold(ret); |
80c9abaa | 3239 | |
9d0380df | 3240 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
80c9abaa SS |
3241 | |
3242 | return ret; | |
3243 | } | |
3244 | ||
dd701754 | 3245 | static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t) |
80c9abaa SS |
3246 | { |
3247 | int match = 0; | |
3248 | ||
3249 | if (t->mode == m->mode && t->id.proto == m->proto && | |
3250 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
3251 | switch (t->mode) { | |
3252 | case XFRM_MODE_TUNNEL: | |
3253 | case XFRM_MODE_BEET: | |
70e94e66 YH |
3254 | if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr, |
3255 | m->old_family) && | |
3256 | xfrm_addr_equal(&t->saddr, &m->old_saddr, | |
3257 | m->old_family)) { | |
80c9abaa SS |
3258 | match = 1; |
3259 | } | |
3260 | break; | |
3261 | case XFRM_MODE_TRANSPORT: | |
3262 | /* in case of transport mode, template does not store | |
3263 | any IP addresses, hence we just compare mode and | |
3264 | protocol */ | |
3265 | match = 1; | |
3266 | break; | |
3267 | default: | |
3268 | break; | |
3269 | } | |
3270 | } | |
3271 | return match; | |
3272 | } | |
3273 | ||
3274 | /* update endpoint address(es) of template(s) */ | |
3275 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
3276 | struct xfrm_migrate *m, int num_migrate) | |
3277 | { | |
3278 | struct xfrm_migrate *mp; | |
80c9abaa SS |
3279 | int i, j, n = 0; |
3280 | ||
3281 | write_lock_bh(&pol->lock); | |
12a169e7 | 3282 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
3283 | /* target policy has been deleted */ |
3284 | write_unlock_bh(&pol->lock); | |
3285 | return -ENOENT; | |
3286 | } | |
3287 | ||
3288 | for (i = 0; i < pol->xfrm_nr; i++) { | |
3289 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
3290 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
3291 | continue; | |
3292 | n++; | |
1bfcb10f HX |
3293 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
3294 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
3295 | continue; |
3296 | /* update endpoints */ | |
3297 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
3298 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
3299 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
3300 | sizeof(pol->xfrm_vec[i].saddr)); | |
3301 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
3302 | /* flush bundles */ | |
80c802f3 | 3303 | atomic_inc(&pol->genid); |
80c9abaa SS |
3304 | } |
3305 | } | |
3306 | ||
3307 | write_unlock_bh(&pol->lock); | |
3308 | ||
3309 | if (!n) | |
3310 | return -ENODATA; | |
3311 | ||
3312 | return 0; | |
3313 | } | |
3314 | ||
dd701754 | 3315 | static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate) |
80c9abaa SS |
3316 | { |
3317 | int i, j; | |
3318 | ||
3319 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
3320 | return -EINVAL; | |
3321 | ||
3322 | for (i = 0; i < num_migrate; i++) { | |
70e94e66 YH |
3323 | if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr, |
3324 | m[i].old_family) && | |
3325 | xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr, | |
3326 | m[i].old_family)) | |
80c9abaa SS |
3327 | return -EINVAL; |
3328 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
3329 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
3330 | return -EINVAL; | |
3331 | ||
3332 | /* check if there is any duplicated entry */ | |
3333 | for (j = i + 1; j < num_migrate; j++) { | |
3334 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
3335 | sizeof(m[i].old_daddr)) && | |
3336 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
3337 | sizeof(m[i].old_saddr)) && | |
3338 | m[i].proto == m[j].proto && | |
3339 | m[i].mode == m[j].mode && | |
3340 | m[i].reqid == m[j].reqid && | |
3341 | m[i].old_family == m[j].old_family) | |
3342 | return -EINVAL; | |
3343 | } | |
3344 | } | |
3345 | ||
3346 | return 0; | |
3347 | } | |
3348 | ||
b4b7c0b3 | 3349 | int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 | 3350 | struct xfrm_migrate *m, int num_migrate, |
8d549c4f | 3351 | struct xfrm_kmaddress *k, struct net *net) |
80c9abaa SS |
3352 | { |
3353 | int i, err, nx_cur = 0, nx_new = 0; | |
3354 | struct xfrm_policy *pol = NULL; | |
3355 | struct xfrm_state *x, *xc; | |
3356 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
3357 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
3358 | struct xfrm_migrate *mp; | |
3359 | ||
3360 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
3361 | goto out; | |
3362 | ||
3363 | /* Stage 1 - find policy */ | |
8d549c4f | 3364 | if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) { |
80c9abaa SS |
3365 | err = -ENOENT; |
3366 | goto out; | |
3367 | } | |
3368 | ||
3369 | /* Stage 2 - find and update state(s) */ | |
3370 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
283bc9f3 | 3371 | if ((x = xfrm_migrate_state_find(mp, net))) { |
80c9abaa SS |
3372 | x_cur[nx_cur] = x; |
3373 | nx_cur++; | |
3374 | if ((xc = xfrm_state_migrate(x, mp))) { | |
3375 | x_new[nx_new] = xc; | |
3376 | nx_new++; | |
3377 | } else { | |
3378 | err = -ENODATA; | |
3379 | goto restore_state; | |
3380 | } | |
3381 | } | |
3382 | } | |
3383 | ||
3384 | /* Stage 3 - update policy */ | |
3385 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
3386 | goto restore_state; | |
3387 | ||
3388 | /* Stage 4 - delete old state(s) */ | |
3389 | if (nx_cur) { | |
3390 | xfrm_states_put(x_cur, nx_cur); | |
3391 | xfrm_states_delete(x_cur, nx_cur); | |
3392 | } | |
3393 | ||
3394 | /* Stage 5 - announce */ | |
13c1d189 | 3395 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
3396 | |
3397 | xfrm_pol_put(pol); | |
3398 | ||
3399 | return 0; | |
3400 | out: | |
3401 | return err; | |
3402 | ||
3403 | restore_state: | |
3404 | if (pol) | |
3405 | xfrm_pol_put(pol); | |
3406 | if (nx_cur) | |
3407 | xfrm_states_put(x_cur, nx_cur); | |
3408 | if (nx_new) | |
3409 | xfrm_states_delete(x_new, nx_new); | |
3410 | ||
3411 | return err; | |
3412 | } | |
e610e679 | 3413 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 3414 | #endif |