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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> |
ec30d78c | 27 | #include <linux/cpu.h> |
68277acc | 28 | #include <linux/audit.h> |
25ee3286 | 29 | #include <net/dst.h> |
6ce74ec7 | 30 | #include <net/flow.h> |
1da177e4 LT |
31 | #include <net/xfrm.h> |
32 | #include <net/ip.h> | |
558f82ef MN |
33 | #ifdef CONFIG_XFRM_STATISTICS |
34 | #include <net/snmp.h> | |
35 | #endif | |
1da177e4 | 36 | |
44e36b42 DM |
37 | #include "xfrm_hash.h" |
38 | ||
a0073fe1 SK |
39 | #define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10)) |
40 | #define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ)) | |
41 | #define XFRM_MAX_QUEUE_LEN 100 | |
42 | ||
b8c203b2 SK |
43 | struct xfrm_flo { |
44 | struct dst_entry *dst_orig; | |
45 | u8 flags; | |
46 | }; | |
47 | ||
ec30d78c FW |
48 | static DEFINE_PER_CPU(struct xfrm_dst *, xfrm_last_dst); |
49 | static struct work_struct *xfrm_pcpu_work __read_mostly; | |
418a99ac | 50 | static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock); |
37b10383 | 51 | static struct xfrm_policy_afinfo const __rcu *xfrm_policy_afinfo[AF_INET6 + 1] |
418a99ac | 52 | __read_mostly; |
1da177e4 | 53 | |
e18b890b | 54 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
30846090 | 55 | static __read_mostly seqcount_t xfrm_policy_hash_generation; |
1da177e4 | 56 | |
25ee3286 | 57 | static void xfrm_init_pmtu(struct dst_entry *dst); |
80c802f3 | 58 | static int stale_bundle(struct dst_entry *dst); |
12fdb4d3 | 59 | static int xfrm_bundle_ok(struct xfrm_dst *xdst); |
c3aed709 | 60 | static void xfrm_policy_queue_process(struct timer_list *t); |
1da177e4 | 61 | |
12bfa8bd | 62 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir); |
29fa0b30 WY |
63 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
64 | int dir); | |
65 | ||
e37cc8ad FW |
66 | static inline bool xfrm_pol_hold_rcu(struct xfrm_policy *policy) |
67 | { | |
850a6212 | 68 | return refcount_inc_not_zero(&policy->refcnt); |
e37cc8ad FW |
69 | } |
70 | ||
bc9b35ad | 71 | static inline bool |
200ce96e | 72 | __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 73 | { |
7e1dc7b6 DM |
74 | const struct flowi4 *fl4 = &fl->u.ip4; |
75 | ||
26bff940 AD |
76 | return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) && |
77 | addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) && | |
7e1dc7b6 DM |
78 | !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) && |
79 | !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) && | |
80 | (fl4->flowi4_proto == sel->proto || !sel->proto) && | |
81 | (fl4->flowi4_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
82 | } |
83 | ||
bc9b35ad | 84 | static inline bool |
200ce96e | 85 | __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 86 | { |
7e1dc7b6 DM |
87 | const struct flowi6 *fl6 = &fl->u.ip6; |
88 | ||
89 | return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) && | |
90 | addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) && | |
91 | !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) && | |
92 | !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) && | |
93 | (fl6->flowi6_proto == sel->proto || !sel->proto) && | |
94 | (fl6->flowi6_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
95 | } |
96 | ||
bc9b35ad DM |
97 | bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl, |
98 | unsigned short family) | |
77681021 AM |
99 | { |
100 | switch (family) { | |
101 | case AF_INET: | |
102 | return __xfrm4_selector_match(sel, fl); | |
103 | case AF_INET6: | |
104 | return __xfrm6_selector_match(sel, fl); | |
105 | } | |
bc9b35ad | 106 | return false; |
77681021 AM |
107 | } |
108 | ||
a2817d8b | 109 | static const struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
ef8531b6 | 110 | { |
a2817d8b | 111 | const struct xfrm_policy_afinfo *afinfo; |
ef8531b6 | 112 | |
a2817d8b | 113 | if (unlikely(family >= ARRAY_SIZE(xfrm_policy_afinfo))) |
ef8531b6 ED |
114 | return NULL; |
115 | rcu_read_lock(); | |
116 | afinfo = rcu_dereference(xfrm_policy_afinfo[family]); | |
117 | if (unlikely(!afinfo)) | |
118 | rcu_read_unlock(); | |
119 | return afinfo; | |
120 | } | |
121 | ||
d77e38e6 SK |
122 | struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, |
123 | const xfrm_address_t *saddr, | |
124 | const xfrm_address_t *daddr, | |
077fbac4 | 125 | int family, u32 mark) |
9bb182a7 | 126 | { |
37b10383 | 127 | const struct xfrm_policy_afinfo *afinfo; |
9bb182a7 YH |
128 | struct dst_entry *dst; |
129 | ||
130 | afinfo = xfrm_policy_get_afinfo(family); | |
131 | if (unlikely(afinfo == NULL)) | |
132 | return ERR_PTR(-EAFNOSUPPORT); | |
133 | ||
077fbac4 | 134 | dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr, mark); |
9bb182a7 | 135 | |
bdba9fe0 | 136 | rcu_read_unlock(); |
9bb182a7 YH |
137 | |
138 | return dst; | |
139 | } | |
d77e38e6 | 140 | EXPORT_SYMBOL(__xfrm_dst_lookup); |
9bb182a7 | 141 | |
42a7b32b DA |
142 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, |
143 | int tos, int oif, | |
9bb182a7 YH |
144 | xfrm_address_t *prev_saddr, |
145 | xfrm_address_t *prev_daddr, | |
077fbac4 | 146 | int family, u32 mark) |
1da177e4 | 147 | { |
c5b3cf46 | 148 | struct net *net = xs_net(x); |
66cdb3ca HX |
149 | xfrm_address_t *saddr = &x->props.saddr; |
150 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
151 | struct dst_entry *dst; |
152 | ||
9bb182a7 | 153 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 154 | saddr = x->coaddr; |
9bb182a7 YH |
155 | daddr = prev_daddr; |
156 | } | |
157 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
158 | saddr = prev_saddr; | |
66cdb3ca | 159 | daddr = x->coaddr; |
9bb182a7 | 160 | } |
1da177e4 | 161 | |
077fbac4 | 162 | dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family, mark); |
9bb182a7 YH |
163 | |
164 | if (!IS_ERR(dst)) { | |
165 | if (prev_saddr != saddr) | |
166 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
167 | if (prev_daddr != daddr) | |
168 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
169 | } | |
1da177e4 | 170 | |
66cdb3ca | 171 | return dst; |
1da177e4 | 172 | } |
1da177e4 | 173 | |
1da177e4 LT |
174 | static inline unsigned long make_jiffies(long secs) |
175 | { | |
176 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
177 | return MAX_SCHEDULE_TIMEOUT-1; | |
178 | else | |
a716c119 | 179 | return secs*HZ; |
1da177e4 LT |
180 | } |
181 | ||
c3aed709 | 182 | static void xfrm_policy_timer(struct timer_list *t) |
1da177e4 | 183 | { |
c3aed709 | 184 | struct xfrm_policy *xp = from_timer(xp, t, timer); |
9d729f72 | 185 | unsigned long now = get_seconds(); |
1da177e4 LT |
186 | long next = LONG_MAX; |
187 | int warn = 0; | |
188 | int dir; | |
189 | ||
190 | read_lock(&xp->lock); | |
191 | ||
ea2dea9d | 192 | if (unlikely(xp->walk.dead)) |
1da177e4 LT |
193 | goto out; |
194 | ||
77d8d7a6 | 195 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
196 | |
197 | if (xp->lft.hard_add_expires_seconds) { | |
198 | long tmo = xp->lft.hard_add_expires_seconds + | |
199 | xp->curlft.add_time - now; | |
200 | if (tmo <= 0) | |
201 | goto expired; | |
202 | if (tmo < next) | |
203 | next = tmo; | |
204 | } | |
205 | if (xp->lft.hard_use_expires_seconds) { | |
206 | long tmo = xp->lft.hard_use_expires_seconds + | |
207 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
208 | if (tmo <= 0) | |
209 | goto expired; | |
210 | if (tmo < next) | |
211 | next = tmo; | |
212 | } | |
213 | if (xp->lft.soft_add_expires_seconds) { | |
214 | long tmo = xp->lft.soft_add_expires_seconds + | |
215 | xp->curlft.add_time - now; | |
216 | if (tmo <= 0) { | |
217 | warn = 1; | |
218 | tmo = XFRM_KM_TIMEOUT; | |
219 | } | |
220 | if (tmo < next) | |
221 | next = tmo; | |
222 | } | |
223 | if (xp->lft.soft_use_expires_seconds) { | |
224 | long tmo = xp->lft.soft_use_expires_seconds + | |
225 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
226 | if (tmo <= 0) { | |
227 | warn = 1; | |
228 | tmo = XFRM_KM_TIMEOUT; | |
229 | } | |
230 | if (tmo < next) | |
231 | next = tmo; | |
232 | } | |
233 | ||
234 | if (warn) | |
6c5c8ca7 | 235 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
236 | if (next != LONG_MAX && |
237 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
238 | xfrm_pol_hold(xp); | |
239 | ||
240 | out: | |
241 | read_unlock(&xp->lock); | |
242 | xfrm_pol_put(xp); | |
243 | return; | |
244 | ||
245 | expired: | |
246 | read_unlock(&xp->lock); | |
4666faab | 247 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 248 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
249 | xfrm_pol_put(xp); |
250 | } | |
251 | ||
1da177e4 LT |
252 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 |
253 | * SPD calls. | |
254 | */ | |
255 | ||
0331b1f3 | 256 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
257 | { |
258 | struct xfrm_policy *policy; | |
259 | ||
0da974f4 | 260 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
261 | |
262 | if (policy) { | |
0331b1f3 | 263 | write_pnet(&policy->xp_net, net); |
12a169e7 | 264 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
265 | INIT_HLIST_NODE(&policy->bydst); |
266 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 267 | rwlock_init(&policy->lock); |
850a6212 | 268 | refcount_set(&policy->refcnt, 1); |
a0073fe1 | 269 | skb_queue_head_init(&policy->polq.hold_queue); |
c3aed709 KC |
270 | timer_setup(&policy->timer, xfrm_policy_timer, 0); |
271 | timer_setup(&policy->polq.hold_timer, | |
272 | xfrm_policy_queue_process, 0); | |
1da177e4 LT |
273 | } |
274 | return policy; | |
275 | } | |
276 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
277 | ||
56f04730 ED |
278 | static void xfrm_policy_destroy_rcu(struct rcu_head *head) |
279 | { | |
280 | struct xfrm_policy *policy = container_of(head, struct xfrm_policy, rcu); | |
281 | ||
282 | security_xfrm_policy_free(policy->security); | |
283 | kfree(policy); | |
284 | } | |
285 | ||
1da177e4 LT |
286 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ |
287 | ||
64c31b3f | 288 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 289 | { |
12a169e7 | 290 | BUG_ON(!policy->walk.dead); |
1da177e4 | 291 | |
0659eea9 | 292 | if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer)) |
1da177e4 LT |
293 | BUG(); |
294 | ||
56f04730 | 295 | call_rcu(&policy->rcu, xfrm_policy_destroy_rcu); |
1da177e4 | 296 | } |
64c31b3f | 297 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 | 298 | |
1365e547 | 299 | /* Rule must be locked. Release descendant resources, announce |
1da177e4 LT |
300 | * entry dead. The rule must be unlinked from lists to the moment. |
301 | */ | |
302 | ||
303 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
304 | { | |
12a169e7 | 305 | policy->walk.dead = 1; |
1da177e4 | 306 | |
285ead17 | 307 | atomic_inc(&policy->genid); |
1da177e4 | 308 | |
e7d8f6cb SK |
309 | if (del_timer(&policy->polq.hold_timer)) |
310 | xfrm_pol_put(policy); | |
1ee5e667 | 311 | skb_queue_purge(&policy->polq.hold_queue); |
a0073fe1 | 312 | |
285ead17 TT |
313 | if (del_timer(&policy->timer)) |
314 | xfrm_pol_put(policy); | |
315 | ||
316 | xfrm_pol_put(policy); | |
1da177e4 LT |
317 | } |
318 | ||
2518c7c2 DM |
319 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
320 | ||
e92303f8 | 321 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 322 | { |
e92303f8 | 323 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
324 | } |
325 | ||
b58555f1 CG |
326 | /* calculate policy hash thresholds */ |
327 | static void __get_hash_thresh(struct net *net, | |
328 | unsigned short family, int dir, | |
329 | u8 *dbits, u8 *sbits) | |
330 | { | |
331 | switch (family) { | |
332 | case AF_INET: | |
333 | *dbits = net->xfrm.policy_bydst[dir].dbits4; | |
334 | *sbits = net->xfrm.policy_bydst[dir].sbits4; | |
335 | break; | |
336 | ||
337 | case AF_INET6: | |
338 | *dbits = net->xfrm.policy_bydst[dir].dbits6; | |
339 | *sbits = net->xfrm.policy_bydst[dir].sbits6; | |
340 | break; | |
341 | ||
342 | default: | |
343 | *dbits = 0; | |
344 | *sbits = 0; | |
345 | } | |
346 | } | |
347 | ||
5f803b58 DM |
348 | static struct hlist_head *policy_hash_bysel(struct net *net, |
349 | const struct xfrm_selector *sel, | |
350 | unsigned short family, int dir) | |
2518c7c2 | 351 | { |
1121994c | 352 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
b58555f1 CG |
353 | unsigned int hash; |
354 | u8 dbits; | |
355 | u8 sbits; | |
356 | ||
357 | __get_hash_thresh(net, family, dir, &dbits, &sbits); | |
358 | hash = __sel_hash(sel, family, hmask, dbits, sbits); | |
2518c7c2 | 359 | |
e1e551bc FW |
360 | if (hash == hmask + 1) |
361 | return &net->xfrm.policy_inexact[dir]; | |
362 | ||
363 | return rcu_dereference_check(net->xfrm.policy_bydst[dir].table, | |
364 | lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash; | |
2518c7c2 DM |
365 | } |
366 | ||
5f803b58 DM |
367 | static struct hlist_head *policy_hash_direct(struct net *net, |
368 | const xfrm_address_t *daddr, | |
369 | const xfrm_address_t *saddr, | |
370 | unsigned short family, int dir) | |
2518c7c2 | 371 | { |
1121994c | 372 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
b58555f1 CG |
373 | unsigned int hash; |
374 | u8 dbits; | |
375 | u8 sbits; | |
376 | ||
377 | __get_hash_thresh(net, family, dir, &dbits, &sbits); | |
378 | hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits); | |
2518c7c2 | 379 | |
e1e551bc FW |
380 | return rcu_dereference_check(net->xfrm.policy_bydst[dir].table, |
381 | lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash; | |
2518c7c2 DM |
382 | } |
383 | ||
b58555f1 CG |
384 | static void xfrm_dst_hash_transfer(struct net *net, |
385 | struct hlist_head *list, | |
2518c7c2 | 386 | struct hlist_head *ndsttable, |
b58555f1 CG |
387 | unsigned int nhashmask, |
388 | int dir) | |
2518c7c2 | 389 | { |
b67bfe0d | 390 | struct hlist_node *tmp, *entry0 = NULL; |
2518c7c2 | 391 | struct xfrm_policy *pol; |
b791160b | 392 | unsigned int h0 = 0; |
b58555f1 CG |
393 | u8 dbits; |
394 | u8 sbits; | |
2518c7c2 | 395 | |
b791160b | 396 | redo: |
b67bfe0d | 397 | hlist_for_each_entry_safe(pol, tmp, list, bydst) { |
2518c7c2 DM |
398 | unsigned int h; |
399 | ||
b58555f1 | 400 | __get_hash_thresh(net, pol->family, dir, &dbits, &sbits); |
2518c7c2 | 401 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, |
b58555f1 | 402 | pol->family, nhashmask, dbits, sbits); |
b791160b | 403 | if (!entry0) { |
a5eefc1d FW |
404 | hlist_del_rcu(&pol->bydst); |
405 | hlist_add_head_rcu(&pol->bydst, ndsttable + h); | |
b791160b YH |
406 | h0 = h; |
407 | } else { | |
408 | if (h != h0) | |
409 | continue; | |
a5eefc1d FW |
410 | hlist_del_rcu(&pol->bydst); |
411 | hlist_add_behind_rcu(&pol->bydst, entry0); | |
b791160b | 412 | } |
b67bfe0d | 413 | entry0 = &pol->bydst; |
b791160b YH |
414 | } |
415 | if (!hlist_empty(list)) { | |
416 | entry0 = NULL; | |
417 | goto redo; | |
2518c7c2 DM |
418 | } |
419 | } | |
420 | ||
421 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
422 | struct hlist_head *nidxtable, | |
423 | unsigned int nhashmask) | |
424 | { | |
b67bfe0d | 425 | struct hlist_node *tmp; |
2518c7c2 DM |
426 | struct xfrm_policy *pol; |
427 | ||
b67bfe0d | 428 | hlist_for_each_entry_safe(pol, tmp, list, byidx) { |
2518c7c2 DM |
429 | unsigned int h; |
430 | ||
431 | h = __idx_hash(pol->index, nhashmask); | |
432 | hlist_add_head(&pol->byidx, nidxtable+h); | |
433 | } | |
434 | } | |
435 | ||
436 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
437 | { | |
438 | return ((old_hmask + 1) << 1) - 1; | |
439 | } | |
440 | ||
66caf628 | 441 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 442 | { |
66caf628 | 443 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
444 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
445 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 | 446 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
e1e551bc | 447 | struct hlist_head *odst; |
2518c7c2 DM |
448 | int i; |
449 | ||
450 | if (!ndst) | |
451 | return; | |
452 | ||
9d0380df | 453 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
30846090 FW |
454 | write_seqcount_begin(&xfrm_policy_hash_generation); |
455 | ||
456 | odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table, | |
457 | lockdep_is_held(&net->xfrm.xfrm_policy_lock)); | |
2518c7c2 | 458 | |
e1e551bc FW |
459 | odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table, |
460 | lockdep_is_held(&net->xfrm.xfrm_policy_lock)); | |
461 | ||
2518c7c2 | 462 | for (i = hmask; i >= 0; i--) |
b58555f1 | 463 | xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir); |
2518c7c2 | 464 | |
e1e551bc | 465 | rcu_assign_pointer(net->xfrm.policy_bydst[dir].table, ndst); |
66caf628 | 466 | net->xfrm.policy_bydst[dir].hmask = nhashmask; |
2518c7c2 | 467 | |
30846090 | 468 | write_seqcount_end(&xfrm_policy_hash_generation); |
9d0380df | 469 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 | 470 | |
e1e551bc FW |
471 | synchronize_rcu(); |
472 | ||
44e36b42 | 473 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
474 | } |
475 | ||
66caf628 | 476 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 477 | { |
66caf628 | 478 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
479 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
480 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 481 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 482 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
483 | int i; |
484 | ||
485 | if (!nidx) | |
486 | return; | |
487 | ||
9d0380df | 488 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
489 | |
490 | for (i = hmask; i >= 0; i--) | |
491 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
492 | ||
66caf628 AD |
493 | net->xfrm.policy_byidx = nidx; |
494 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 | 495 | |
9d0380df | 496 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 | 497 | |
44e36b42 | 498 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
499 | } |
500 | ||
66caf628 | 501 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 502 | { |
66caf628 AD |
503 | unsigned int cnt = net->xfrm.policy_count[dir]; |
504 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
505 | |
506 | if (total) | |
507 | *total += cnt; | |
508 | ||
509 | if ((hmask + 1) < xfrm_policy_hashmax && | |
510 | cnt > hmask) | |
511 | return 1; | |
512 | ||
513 | return 0; | |
514 | } | |
515 | ||
66caf628 | 516 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 517 | { |
66caf628 | 518 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
519 | |
520 | if ((hmask + 1) < xfrm_policy_hashmax && | |
521 | total > hmask) | |
522 | return 1; | |
523 | ||
524 | return 0; | |
525 | } | |
526 | ||
e071041b | 527 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 | 528 | { |
e071041b AD |
529 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
530 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
531 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
532 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
533 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
534 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
535 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 | 536 | si->spdhmcnt = xfrm_policy_hashmax; |
ecfd6b18 JHS |
537 | } |
538 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 539 | |
ecfd6b18 | 540 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 541 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 542 | { |
66caf628 | 543 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
544 | int dir, total; |
545 | ||
546 | mutex_lock(&hash_resize_mutex); | |
547 | ||
548 | total = 0; | |
53c2e285 | 549 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
66caf628 AD |
550 | if (xfrm_bydst_should_resize(net, dir, &total)) |
551 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 552 | } |
66caf628 AD |
553 | if (xfrm_byidx_should_resize(net, total)) |
554 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
555 | |
556 | mutex_unlock(&hash_resize_mutex); | |
557 | } | |
558 | ||
880a6fab CG |
559 | static void xfrm_hash_rebuild(struct work_struct *work) |
560 | { | |
561 | struct net *net = container_of(work, struct net, | |
562 | xfrm.policy_hthresh.work); | |
563 | unsigned int hmask; | |
564 | struct xfrm_policy *pol; | |
565 | struct xfrm_policy *policy; | |
566 | struct hlist_head *chain; | |
567 | struct hlist_head *odst; | |
568 | struct hlist_node *newpos; | |
569 | int i; | |
570 | int dir; | |
571 | unsigned seq; | |
572 | u8 lbits4, rbits4, lbits6, rbits6; | |
573 | ||
574 | mutex_lock(&hash_resize_mutex); | |
575 | ||
576 | /* read selector prefixlen thresholds */ | |
577 | do { | |
578 | seq = read_seqbegin(&net->xfrm.policy_hthresh.lock); | |
579 | ||
580 | lbits4 = net->xfrm.policy_hthresh.lbits4; | |
581 | rbits4 = net->xfrm.policy_hthresh.rbits4; | |
582 | lbits6 = net->xfrm.policy_hthresh.lbits6; | |
583 | rbits6 = net->xfrm.policy_hthresh.rbits6; | |
584 | } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq)); | |
585 | ||
9d0380df | 586 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
880a6fab CG |
587 | |
588 | /* reset the bydst and inexact table in all directions */ | |
53c2e285 | 589 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
880a6fab CG |
590 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
591 | hmask = net->xfrm.policy_bydst[dir].hmask; | |
592 | odst = net->xfrm.policy_bydst[dir].table; | |
593 | for (i = hmask; i >= 0; i--) | |
594 | INIT_HLIST_HEAD(odst + i); | |
595 | if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) { | |
596 | /* dir out => dst = remote, src = local */ | |
597 | net->xfrm.policy_bydst[dir].dbits4 = rbits4; | |
598 | net->xfrm.policy_bydst[dir].sbits4 = lbits4; | |
599 | net->xfrm.policy_bydst[dir].dbits6 = rbits6; | |
600 | net->xfrm.policy_bydst[dir].sbits6 = lbits6; | |
601 | } else { | |
602 | /* dir in/fwd => dst = local, src = remote */ | |
603 | net->xfrm.policy_bydst[dir].dbits4 = lbits4; | |
604 | net->xfrm.policy_bydst[dir].sbits4 = rbits4; | |
605 | net->xfrm.policy_bydst[dir].dbits6 = lbits6; | |
606 | net->xfrm.policy_bydst[dir].sbits6 = rbits6; | |
607 | } | |
608 | } | |
609 | ||
610 | /* re-insert all policies by order of creation */ | |
611 | list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) { | |
862591bf FW |
612 | if (policy->walk.dead || |
613 | xfrm_policy_id2dir(policy->index) >= XFRM_POLICY_MAX) { | |
6916fb3b TB |
614 | /* skip socket policies */ |
615 | continue; | |
616 | } | |
880a6fab CG |
617 | newpos = NULL; |
618 | chain = policy_hash_bysel(net, &policy->selector, | |
619 | policy->family, | |
620 | xfrm_policy_id2dir(policy->index)); | |
621 | hlist_for_each_entry(pol, chain, bydst) { | |
622 | if (policy->priority >= pol->priority) | |
623 | newpos = &pol->bydst; | |
624 | else | |
625 | break; | |
626 | } | |
627 | if (newpos) | |
628 | hlist_add_behind(&policy->bydst, newpos); | |
629 | else | |
630 | hlist_add_head(&policy->bydst, chain); | |
631 | } | |
632 | ||
9d0380df | 633 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
880a6fab CG |
634 | |
635 | mutex_unlock(&hash_resize_mutex); | |
636 | } | |
637 | ||
638 | void xfrm_policy_hash_rebuild(struct net *net) | |
639 | { | |
640 | schedule_work(&net->xfrm.policy_hthresh.work); | |
641 | } | |
642 | EXPORT_SYMBOL(xfrm_policy_hash_rebuild); | |
643 | ||
1da177e4 LT |
644 | /* Generate new index... KAME seems to generate them ordered by cost |
645 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
e682adf0 | 646 | static u32 xfrm_gen_index(struct net *net, int dir, u32 index) |
1da177e4 | 647 | { |
1da177e4 LT |
648 | static u32 idx_generator; |
649 | ||
650 | for (;;) { | |
2518c7c2 DM |
651 | struct hlist_head *list; |
652 | struct xfrm_policy *p; | |
653 | u32 idx; | |
654 | int found; | |
655 | ||
e682adf0 FD |
656 | if (!index) { |
657 | idx = (idx_generator | dir); | |
658 | idx_generator += 8; | |
659 | } else { | |
660 | idx = index; | |
661 | index = 0; | |
662 | } | |
663 | ||
1da177e4 LT |
664 | if (idx == 0) |
665 | idx = 8; | |
1121994c | 666 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 | 667 | found = 0; |
b67bfe0d | 668 | hlist_for_each_entry(p, list, byidx) { |
2518c7c2 DM |
669 | if (p->index == idx) { |
670 | found = 1; | |
1da177e4 | 671 | break; |
2518c7c2 | 672 | } |
1da177e4 | 673 | } |
2518c7c2 | 674 | if (!found) |
1da177e4 LT |
675 | return idx; |
676 | } | |
677 | } | |
678 | ||
2518c7c2 DM |
679 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
680 | { | |
681 | u32 *p1 = (u32 *) s1; | |
682 | u32 *p2 = (u32 *) s2; | |
683 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
684 | int i; | |
685 | ||
686 | for (i = 0; i < len; i++) { | |
687 | if (p1[i] != p2[i]) | |
688 | return 1; | |
689 | } | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
a0073fe1 SK |
694 | static void xfrm_policy_requeue(struct xfrm_policy *old, |
695 | struct xfrm_policy *new) | |
696 | { | |
697 | struct xfrm_policy_queue *pq = &old->polq; | |
698 | struct sk_buff_head list; | |
699 | ||
de2ad486 LR |
700 | if (skb_queue_empty(&pq->hold_queue)) |
701 | return; | |
702 | ||
a0073fe1 SK |
703 | __skb_queue_head_init(&list); |
704 | ||
705 | spin_lock_bh(&pq->hold_queue.lock); | |
706 | skb_queue_splice_init(&pq->hold_queue, &list); | |
e7d8f6cb SK |
707 | if (del_timer(&pq->hold_timer)) |
708 | xfrm_pol_put(old); | |
a0073fe1 SK |
709 | spin_unlock_bh(&pq->hold_queue.lock); |
710 | ||
a0073fe1 SK |
711 | pq = &new->polq; |
712 | ||
713 | spin_lock_bh(&pq->hold_queue.lock); | |
714 | skb_queue_splice(&list, &pq->hold_queue); | |
715 | pq->timeout = XFRM_QUEUE_TMO_MIN; | |
e7d8f6cb SK |
716 | if (!mod_timer(&pq->hold_timer, jiffies)) |
717 | xfrm_pol_hold(new); | |
a0073fe1 SK |
718 | spin_unlock_bh(&pq->hold_queue.lock); |
719 | } | |
720 | ||
7cb8a939 SK |
721 | static bool xfrm_policy_mark_match(struct xfrm_policy *policy, |
722 | struct xfrm_policy *pol) | |
723 | { | |
724 | u32 mark = policy->mark.v & policy->mark.m; | |
725 | ||
726 | if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m) | |
727 | return true; | |
728 | ||
729 | if ((mark & pol->mark.m) == pol->mark.v && | |
730 | policy->priority == pol->priority) | |
731 | return true; | |
732 | ||
733 | return false; | |
734 | } | |
735 | ||
1da177e4 LT |
736 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
737 | { | |
1121994c | 738 | struct net *net = xp_net(policy); |
2518c7c2 DM |
739 | struct xfrm_policy *pol; |
740 | struct xfrm_policy *delpol; | |
741 | struct hlist_head *chain; | |
b67bfe0d | 742 | struct hlist_node *newpos; |
1da177e4 | 743 | |
9d0380df | 744 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
1121994c | 745 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
746 | delpol = NULL; |
747 | newpos = NULL; | |
b67bfe0d | 748 | hlist_for_each_entry(pol, chain, bydst) { |
a6c7ab55 | 749 | if (pol->type == policy->type && |
2518c7c2 | 750 | !selector_cmp(&pol->selector, &policy->selector) && |
7cb8a939 | 751 | xfrm_policy_mark_match(policy, pol) && |
a6c7ab55 HX |
752 | xfrm_sec_ctx_match(pol->security, policy->security) && |
753 | !WARN_ON(delpol)) { | |
1da177e4 | 754 | if (excl) { |
9d0380df | 755 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
756 | return -EEXIST; |
757 | } | |
1da177e4 LT |
758 | delpol = pol; |
759 | if (policy->priority > pol->priority) | |
760 | continue; | |
761 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 762 | newpos = &pol->bydst; |
1da177e4 LT |
763 | continue; |
764 | } | |
1da177e4 LT |
765 | if (delpol) |
766 | break; | |
1da177e4 LT |
767 | } |
768 | if (newpos) | |
1d023284 | 769 | hlist_add_behind(&policy->bydst, newpos); |
2518c7c2 DM |
770 | else |
771 | hlist_add_head(&policy->bydst, chain); | |
12bfa8bd | 772 | __xfrm_policy_link(policy, dir); |
ca4c3fc2 | 773 | |
774 | /* After previous checking, family can either be AF_INET or AF_INET6 */ | |
775 | if (policy->family == AF_INET) | |
776 | rt_genid_bump_ipv4(net); | |
777 | else | |
778 | rt_genid_bump_ipv6(net); | |
779 | ||
a0073fe1 SK |
780 | if (delpol) { |
781 | xfrm_policy_requeue(delpol, policy); | |
29fa0b30 | 782 | __xfrm_policy_unlink(delpol, dir); |
a0073fe1 | 783 | } |
e682adf0 | 784 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index); |
1121994c | 785 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); |
9d729f72 | 786 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
787 | policy->curlft.use_time = 0; |
788 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
789 | xfrm_pol_hold(policy); | |
9d0380df | 790 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 791 | |
9b78a82c | 792 | if (delpol) |
1da177e4 | 793 | xfrm_policy_kill(delpol); |
1121994c AD |
794 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
795 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c | 796 | |
1da177e4 LT |
797 | return 0; |
798 | } | |
799 | EXPORT_SYMBOL(xfrm_policy_insert); | |
800 | ||
8ca2e93b JHS |
801 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
802 | int dir, struct xfrm_selector *sel, | |
ef41aaa0 EP |
803 | struct xfrm_sec_ctx *ctx, int delete, |
804 | int *err) | |
1da177e4 | 805 | { |
2518c7c2 DM |
806 | struct xfrm_policy *pol, *ret; |
807 | struct hlist_head *chain; | |
1da177e4 | 808 | |
ef41aaa0 | 809 | *err = 0; |
9d0380df | 810 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
8d1211a6 | 811 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 | 812 | ret = NULL; |
b67bfe0d | 813 | hlist_for_each_entry(pol, chain, bydst) { |
2518c7c2 | 814 | if (pol->type == type && |
34f8d884 | 815 | (mark & pol->mark.m) == pol->mark.v && |
2518c7c2 DM |
816 | !selector_cmp(sel, &pol->selector) && |
817 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 818 | xfrm_pol_hold(pol); |
2518c7c2 | 819 | if (delete) { |
03e1ad7b PM |
820 | *err = security_xfrm_policy_delete( |
821 | pol->security); | |
ef41aaa0 | 822 | if (*err) { |
9d0380df | 823 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ef41aaa0 EP |
824 | return pol; |
825 | } | |
29fa0b30 | 826 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
827 | } |
828 | ret = pol; | |
1da177e4 LT |
829 | break; |
830 | } | |
831 | } | |
9d0380df | 832 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 833 | |
fe1a5f03 | 834 | if (ret && delete) |
2518c7c2 | 835 | xfrm_policy_kill(ret); |
2518c7c2 | 836 | return ret; |
1da177e4 | 837 | } |
df71837d | 838 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 839 | |
8ca2e93b JHS |
840 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
841 | int dir, u32 id, int delete, int *err) | |
1da177e4 | 842 | { |
2518c7c2 DM |
843 | struct xfrm_policy *pol, *ret; |
844 | struct hlist_head *chain; | |
1da177e4 | 845 | |
b5505c6e HX |
846 | *err = -ENOENT; |
847 | if (xfrm_policy_id2dir(id) != dir) | |
848 | return NULL; | |
849 | ||
ef41aaa0 | 850 | *err = 0; |
9d0380df | 851 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
8d1211a6 | 852 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 | 853 | ret = NULL; |
b67bfe0d | 854 | hlist_for_each_entry(pol, chain, byidx) { |
34f8d884 JHS |
855 | if (pol->type == type && pol->index == id && |
856 | (mark & pol->mark.m) == pol->mark.v) { | |
1da177e4 | 857 | xfrm_pol_hold(pol); |
2518c7c2 | 858 | if (delete) { |
03e1ad7b PM |
859 | *err = security_xfrm_policy_delete( |
860 | pol->security); | |
ef41aaa0 | 861 | if (*err) { |
9d0380df | 862 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ef41aaa0 EP |
863 | return pol; |
864 | } | |
29fa0b30 | 865 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
866 | } |
867 | ret = pol; | |
1da177e4 LT |
868 | break; |
869 | } | |
870 | } | |
9d0380df | 871 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 872 | |
fe1a5f03 | 873 | if (ret && delete) |
2518c7c2 | 874 | xfrm_policy_kill(ret); |
2518c7c2 | 875 | return ret; |
1da177e4 LT |
876 | } |
877 | EXPORT_SYMBOL(xfrm_policy_byid); | |
878 | ||
4aa2e62c JL |
879 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
880 | static inline int | |
2e71029e | 881 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid) |
1da177e4 | 882 | { |
4aa2e62c JL |
883 | int dir, err = 0; |
884 | ||
885 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
886 | struct xfrm_policy *pol; | |
4aa2e62c JL |
887 | int i; |
888 | ||
b67bfe0d | 889 | hlist_for_each_entry(pol, |
33ffbbd5 | 890 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
891 | if (pol->type != type) |
892 | continue; | |
03e1ad7b | 893 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 894 | if (err) { |
2e71029e | 895 | xfrm_audit_policy_delete(pol, 0, task_valid); |
4aa2e62c JL |
896 | return err; |
897 | } | |
7dc12d6d | 898 | } |
33ffbbd5 | 899 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
b67bfe0d | 900 | hlist_for_each_entry(pol, |
33ffbbd5 | 901 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
902 | bydst) { |
903 | if (pol->type != type) | |
904 | continue; | |
03e1ad7b PM |
905 | err = security_xfrm_policy_delete( |
906 | pol->security); | |
4aa2e62c | 907 | if (err) { |
ab5f5e8b | 908 | xfrm_audit_policy_delete(pol, 0, |
2e71029e | 909 | task_valid); |
4aa2e62c JL |
910 | return err; |
911 | } | |
912 | } | |
913 | } | |
914 | } | |
915 | return err; | |
916 | } | |
917 | #else | |
918 | static inline int | |
2e71029e | 919 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid) |
4aa2e62c JL |
920 | { |
921 | return 0; | |
922 | } | |
923 | #endif | |
924 | ||
2e71029e | 925 | int xfrm_policy_flush(struct net *net, u8 type, bool task_valid) |
4aa2e62c | 926 | { |
2f1eb65f | 927 | int dir, err = 0, cnt = 0; |
1da177e4 | 928 | |
9d0380df | 929 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
4aa2e62c | 930 | |
2e71029e | 931 | err = xfrm_policy_flush_secctx_check(net, type, task_valid); |
4aa2e62c JL |
932 | if (err) |
933 | goto out; | |
934 | ||
1da177e4 | 935 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 | 936 | struct xfrm_policy *pol; |
29fa0b30 | 937 | int i; |
2518c7c2 DM |
938 | |
939 | again1: | |
b67bfe0d | 940 | hlist_for_each_entry(pol, |
33ffbbd5 | 941 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
942 | if (pol->type != type) |
943 | continue; | |
ea2dea9d | 944 | __xfrm_policy_unlink(pol, dir); |
9d0380df | 945 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ea2dea9d | 946 | cnt++; |
1da177e4 | 947 | |
2e71029e | 948 | xfrm_audit_policy_delete(pol, 1, task_valid); |
161a09e7 | 949 | |
2518c7c2 | 950 | xfrm_policy_kill(pol); |
1da177e4 | 951 | |
4141b36a | 952 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
953 | goto again1; |
954 | } | |
955 | ||
33ffbbd5 | 956 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 | 957 | again2: |
b67bfe0d | 958 | hlist_for_each_entry(pol, |
33ffbbd5 | 959 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
960 | bydst) { |
961 | if (pol->type != type) | |
962 | continue; | |
ea2dea9d | 963 | __xfrm_policy_unlink(pol, dir); |
9d0380df | 964 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ea2dea9d | 965 | cnt++; |
2518c7c2 | 966 | |
2e71029e | 967 | xfrm_audit_policy_delete(pol, 1, task_valid); |
2518c7c2 DM |
968 | xfrm_policy_kill(pol); |
969 | ||
9d0380df | 970 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
971 | goto again2; |
972 | } | |
1da177e4 | 973 | } |
2518c7c2 | 974 | |
1da177e4 | 975 | } |
2f1eb65f JHS |
976 | if (!cnt) |
977 | err = -ESRCH; | |
4aa2e62c | 978 | out: |
9d0380df | 979 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
4aa2e62c | 980 | return err; |
1da177e4 LT |
981 | } |
982 | EXPORT_SYMBOL(xfrm_policy_flush); | |
983 | ||
cdcbca7c | 984 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 985 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
986 | void *data) |
987 | { | |
12a169e7 HX |
988 | struct xfrm_policy *pol; |
989 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
990 | int error = 0; |
991 | ||
992 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
993 | walk->type != XFRM_POLICY_TYPE_ANY) | |
994 | return -EINVAL; | |
1da177e4 | 995 | |
12a169e7 | 996 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
997 | return 0; |
998 | ||
9d0380df | 999 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
12a169e7 | 1000 | if (list_empty(&walk->walk.all)) |
cdcbca7c | 1001 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 | 1002 | else |
80077702 LR |
1003 | x = list_first_entry(&walk->walk.all, |
1004 | struct xfrm_policy_walk_entry, all); | |
1005 | ||
cdcbca7c | 1006 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 1007 | if (x->dead) |
4c563f76 | 1008 | continue; |
12a169e7 HX |
1009 | pol = container_of(x, struct xfrm_policy, walk); |
1010 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
1011 | walk->type != pol->type) | |
1012 | continue; | |
1013 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
1014 | walk->seq, data); | |
1015 | if (error) { | |
1016 | list_move_tail(&walk->walk.all, &x->all); | |
1017 | goto out; | |
2518c7c2 | 1018 | } |
12a169e7 | 1019 | walk->seq++; |
1da177e4 | 1020 | } |
12a169e7 | 1021 | if (walk->seq == 0) { |
baf5d743 JHS |
1022 | error = -ENOENT; |
1023 | goto out; | |
1024 | } | |
12a169e7 | 1025 | list_del_init(&walk->walk.all); |
1da177e4 | 1026 | out: |
9d0380df | 1027 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1028 | return error; |
1029 | } | |
1030 | EXPORT_SYMBOL(xfrm_policy_walk); | |
1031 | ||
12a169e7 HX |
1032 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
1033 | { | |
1034 | INIT_LIST_HEAD(&walk->walk.all); | |
1035 | walk->walk.dead = 1; | |
1036 | walk->type = type; | |
1037 | walk->seq = 0; | |
1038 | } | |
1039 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
1040 | ||
283bc9f3 | 1041 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net) |
12a169e7 HX |
1042 | { |
1043 | if (list_empty(&walk->walk.all)) | |
1044 | return; | |
1045 | ||
9d0380df | 1046 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */ |
12a169e7 | 1047 | list_del(&walk->walk.all); |
9d0380df | 1048 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
12a169e7 HX |
1049 | } |
1050 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
1051 | ||
134b0fc5 JM |
1052 | /* |
1053 | * Find policy to apply to this flow. | |
1054 | * | |
1055 | * Returns 0 if policy found, else an -errno. | |
1056 | */ | |
f299d557 DM |
1057 | static int xfrm_policy_match(const struct xfrm_policy *pol, |
1058 | const struct flowi *fl, | |
2518c7c2 | 1059 | u8 type, u16 family, int dir) |
1da177e4 | 1060 | { |
f299d557 | 1061 | const struct xfrm_selector *sel = &pol->selector; |
bc9b35ad DM |
1062 | int ret = -ESRCH; |
1063 | bool match; | |
1da177e4 | 1064 | |
2518c7c2 | 1065 | if (pol->family != family || |
1d28f42c | 1066 | (fl->flowi_mark & pol->mark.m) != pol->mark.v || |
2518c7c2 | 1067 | pol->type != type) |
134b0fc5 | 1068 | return ret; |
1da177e4 | 1069 | |
2518c7c2 | 1070 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 1071 | if (match) |
1d28f42c | 1072 | ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid, |
03e1ad7b | 1073 | dir); |
2518c7c2 | 1074 | |
134b0fc5 | 1075 | return ret; |
2518c7c2 | 1076 | } |
1da177e4 | 1077 | |
52479b62 | 1078 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
062cdb43 | 1079 | const struct flowi *fl, |
2518c7c2 DM |
1080 | u16 family, u8 dir) |
1081 | { | |
134b0fc5 | 1082 | int err; |
2518c7c2 | 1083 | struct xfrm_policy *pol, *ret; |
0b597e7e | 1084 | const xfrm_address_t *daddr, *saddr; |
2518c7c2 | 1085 | struct hlist_head *chain; |
30846090 FW |
1086 | unsigned int sequence; |
1087 | u32 priority; | |
df71837d | 1088 | |
2518c7c2 DM |
1089 | daddr = xfrm_flowi_daddr(fl, family); |
1090 | saddr = xfrm_flowi_saddr(fl, family); | |
1091 | if (unlikely(!daddr || !saddr)) | |
1092 | return NULL; | |
1093 | ||
a7c44247 | 1094 | rcu_read_lock(); |
30846090 FW |
1095 | retry: |
1096 | do { | |
1097 | sequence = read_seqcount_begin(&xfrm_policy_hash_generation); | |
1098 | chain = policy_hash_direct(net, daddr, saddr, family, dir); | |
1099 | } while (read_seqcount_retry(&xfrm_policy_hash_generation, sequence)); | |
1100 | ||
1101 | priority = ~0U; | |
2518c7c2 | 1102 | ret = NULL; |
a5eefc1d | 1103 | hlist_for_each_entry_rcu(pol, chain, bydst) { |
134b0fc5 JM |
1104 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1105 | if (err) { | |
1106 | if (err == -ESRCH) | |
1107 | continue; | |
1108 | else { | |
1109 | ret = ERR_PTR(err); | |
1110 | goto fail; | |
1111 | } | |
1112 | } else { | |
2518c7c2 | 1113 | ret = pol; |
acba48e1 | 1114 | priority = ret->priority; |
2518c7c2 DM |
1115 | break; |
1116 | } | |
1117 | } | |
52479b62 | 1118 | chain = &net->xfrm.policy_inexact[dir]; |
a5eefc1d | 1119 | hlist_for_each_entry_rcu(pol, chain, bydst) { |
8faf491e LR |
1120 | if ((pol->priority >= priority) && ret) |
1121 | break; | |
1122 | ||
134b0fc5 JM |
1123 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1124 | if (err) { | |
1125 | if (err == -ESRCH) | |
1126 | continue; | |
1127 | else { | |
1128 | ret = ERR_PTR(err); | |
1129 | goto fail; | |
1130 | } | |
8faf491e | 1131 | } else { |
acba48e1 DM |
1132 | ret = pol; |
1133 | break; | |
1da177e4 LT |
1134 | } |
1135 | } | |
586f2eb4 | 1136 | |
30846090 FW |
1137 | if (read_seqcount_retry(&xfrm_policy_hash_generation, sequence)) |
1138 | goto retry; | |
1139 | ||
e37cc8ad FW |
1140 | if (ret && !xfrm_pol_hold_rcu(ret)) |
1141 | goto retry; | |
134b0fc5 | 1142 | fail: |
a7c44247 | 1143 | rcu_read_unlock(); |
4e81bb83 | 1144 | |
2518c7c2 | 1145 | return ret; |
4e81bb83 MN |
1146 | } |
1147 | ||
80c802f3 | 1148 | static struct xfrm_policy * |
86dc8ee0 | 1149 | xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir) |
80c802f3 TT |
1150 | { |
1151 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1152 | struct xfrm_policy *pol; | |
1153 | ||
1154 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
1155 | if (pol != NULL) | |
1156 | return pol; | |
1157 | #endif | |
1158 | return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
1159 | } | |
1160 | ||
6f9c9615 | 1161 | static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir, |
4c86d777 | 1162 | const struct flowi *fl, u16 family) |
1da177e4 LT |
1163 | { |
1164 | struct xfrm_policy *pol; | |
1165 | ||
d188ba86 | 1166 | rcu_read_lock(); |
ae33786f | 1167 | again: |
d188ba86 ED |
1168 | pol = rcu_dereference(sk->sk_policy[dir]); |
1169 | if (pol != NULL) { | |
ddc47e44 | 1170 | bool match; |
a716c119 | 1171 | int err = 0; |
df71837d | 1172 | |
ddc47e44 SK |
1173 | if (pol->family != family) { |
1174 | pol = NULL; | |
1175 | goto out; | |
1176 | } | |
1177 | ||
1178 | match = xfrm_selector_match(&pol->selector, fl, family); | |
3bccfbc7 | 1179 | if (match) { |
34f8d884 JHS |
1180 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
1181 | pol = NULL; | |
1182 | goto out; | |
1183 | } | |
03e1ad7b | 1184 | err = security_xfrm_policy_lookup(pol->security, |
1d28f42c | 1185 | fl->flowi_secid, |
aff669bc | 1186 | dir); |
330e832a FW |
1187 | if (!err) { |
1188 | if (!xfrm_pol_hold_rcu(pol)) | |
1189 | goto again; | |
1190 | } else if (err == -ESRCH) { | |
3bccfbc7 | 1191 | pol = NULL; |
330e832a | 1192 | } else { |
3bccfbc7 | 1193 | pol = ERR_PTR(err); |
330e832a | 1194 | } |
3bccfbc7 | 1195 | } else |
1da177e4 LT |
1196 | pol = NULL; |
1197 | } | |
34f8d884 | 1198 | out: |
d188ba86 | 1199 | rcu_read_unlock(); |
1da177e4 LT |
1200 | return pol; |
1201 | } | |
1202 | ||
1203 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1204 | { | |
98806f75 | 1205 | struct net *net = xp_net(pol); |
4e81bb83 | 1206 | |
98806f75 | 1207 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
98806f75 | 1208 | net->xfrm.policy_count[dir]++; |
1da177e4 LT |
1209 | xfrm_pol_hold(pol); |
1210 | } | |
1211 | ||
1212 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1213 | int dir) | |
1214 | { | |
98806f75 AD |
1215 | struct net *net = xp_net(pol); |
1216 | ||
53c2e285 | 1217 | if (list_empty(&pol->walk.all)) |
2518c7c2 | 1218 | return NULL; |
1da177e4 | 1219 | |
53c2e285 HX |
1220 | /* Socket policies are not hashed. */ |
1221 | if (!hlist_unhashed(&pol->bydst)) { | |
a5eefc1d | 1222 | hlist_del_rcu(&pol->bydst); |
53c2e285 HX |
1223 | hlist_del(&pol->byidx); |
1224 | } | |
1225 | ||
1226 | list_del_init(&pol->walk.all); | |
98806f75 | 1227 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1228 | |
1229 | return pol; | |
1da177e4 LT |
1230 | } |
1231 | ||
53c2e285 HX |
1232 | static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir) |
1233 | { | |
1234 | __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir); | |
1235 | } | |
1236 | ||
1237 | static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir) | |
1238 | { | |
1239 | __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir); | |
1240 | } | |
1241 | ||
4666faab | 1242 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 | 1243 | { |
283bc9f3 FD |
1244 | struct net *net = xp_net(pol); |
1245 | ||
9d0380df | 1246 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 1247 | pol = __xfrm_policy_unlink(pol, dir); |
9d0380df | 1248 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 1249 | if (pol) { |
1da177e4 | 1250 | xfrm_policy_kill(pol); |
4666faab | 1251 | return 0; |
1da177e4 | 1252 | } |
4666faab | 1253 | return -ENOENT; |
1da177e4 | 1254 | } |
a70fcb0b | 1255 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1256 | |
1257 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1258 | { | |
acb2e0cd | 1259 | struct net *net = sock_net(sk); |
1da177e4 LT |
1260 | struct xfrm_policy *old_pol; |
1261 | ||
4e81bb83 MN |
1262 | #ifdef CONFIG_XFRM_SUB_POLICY |
1263 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1264 | return -EINVAL; | |
1265 | #endif | |
1266 | ||
9d0380df | 1267 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
d188ba86 ED |
1268 | old_pol = rcu_dereference_protected(sk->sk_policy[dir], |
1269 | lockdep_is_held(&net->xfrm.xfrm_policy_lock)); | |
1da177e4 | 1270 | if (pol) { |
9d729f72 | 1271 | pol->curlft.add_time = get_seconds(); |
e682adf0 | 1272 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0); |
53c2e285 | 1273 | xfrm_sk_policy_link(pol, dir); |
1da177e4 | 1274 | } |
d188ba86 | 1275 | rcu_assign_pointer(sk->sk_policy[dir], pol); |
a0073fe1 SK |
1276 | if (old_pol) { |
1277 | if (pol) | |
1278 | xfrm_policy_requeue(old_pol, pol); | |
1279 | ||
ea2dea9d TT |
1280 | /* Unlinking succeeds always. This is the only function |
1281 | * allowed to delete or replace socket policy. | |
1282 | */ | |
53c2e285 | 1283 | xfrm_sk_policy_unlink(old_pol, dir); |
a0073fe1 | 1284 | } |
9d0380df | 1285 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1286 | |
1287 | if (old_pol) { | |
1288 | xfrm_policy_kill(old_pol); | |
1289 | } | |
1290 | return 0; | |
1291 | } | |
1292 | ||
d3e40a9f | 1293 | static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir) |
1da177e4 | 1294 | { |
0331b1f3 | 1295 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
283bc9f3 | 1296 | struct net *net = xp_net(old); |
1da177e4 LT |
1297 | |
1298 | if (newp) { | |
1299 | newp->selector = old->selector; | |
03e1ad7b PM |
1300 | if (security_xfrm_policy_clone(old->security, |
1301 | &newp->security)) { | |
df71837d TJ |
1302 | kfree(newp); |
1303 | return NULL; /* ENOMEM */ | |
1304 | } | |
1da177e4 LT |
1305 | newp->lft = old->lft; |
1306 | newp->curlft = old->curlft; | |
fb977e2c | 1307 | newp->mark = old->mark; |
1da177e4 LT |
1308 | newp->action = old->action; |
1309 | newp->flags = old->flags; | |
1310 | newp->xfrm_nr = old->xfrm_nr; | |
1311 | newp->index = old->index; | |
4e81bb83 | 1312 | newp->type = old->type; |
0e74aa1d | 1313 | newp->family = old->family; |
1da177e4 LT |
1314 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1315 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
9d0380df | 1316 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
53c2e285 | 1317 | xfrm_sk_policy_link(newp, dir); |
9d0380df | 1318 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1319 | xfrm_pol_put(newp); |
1320 | } | |
1321 | return newp; | |
1322 | } | |
1323 | ||
d188ba86 | 1324 | int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) |
1da177e4 | 1325 | { |
d188ba86 ED |
1326 | const struct xfrm_policy *p; |
1327 | struct xfrm_policy *np; | |
1328 | int i, ret = 0; | |
1329 | ||
1330 | rcu_read_lock(); | |
1331 | for (i = 0; i < 2; i++) { | |
1332 | p = rcu_dereference(osk->sk_policy[i]); | |
1333 | if (p) { | |
1334 | np = clone_policy(p, i); | |
1335 | if (unlikely(!np)) { | |
1336 | ret = -ENOMEM; | |
1337 | break; | |
1338 | } | |
1339 | rcu_assign_pointer(sk->sk_policy[i], np); | |
1340 | } | |
1341 | } | |
1342 | rcu_read_unlock(); | |
1343 | return ret; | |
1da177e4 LT |
1344 | } |
1345 | ||
a1e59abf | 1346 | static int |
42a7b32b | 1347 | xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local, |
077fbac4 | 1348 | xfrm_address_t *remote, unsigned short family, u32 mark) |
a1e59abf PM |
1349 | { |
1350 | int err; | |
37b10383 | 1351 | const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
a1e59abf PM |
1352 | |
1353 | if (unlikely(afinfo == NULL)) | |
1354 | return -EINVAL; | |
077fbac4 | 1355 | err = afinfo->get_saddr(net, oif, local, remote, mark); |
bdba9fe0 | 1356 | rcu_read_unlock(); |
a1e59abf PM |
1357 | return err; |
1358 | } | |
1359 | ||
1da177e4 LT |
1360 | /* Resolve list of templates for the flow, given policy. */ |
1361 | ||
1362 | static int | |
a6c2e611 DM |
1363 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl, |
1364 | struct xfrm_state **xfrm, unsigned short family) | |
1da177e4 | 1365 | { |
fbda33b2 | 1366 | struct net *net = xp_net(policy); |
1da177e4 LT |
1367 | int nx; |
1368 | int i, error; | |
94802151 SK |
1369 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); |
1370 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1371 | xfrm_address_t tmp; |
1da177e4 | 1372 | |
9b7a787d | 1373 | for (nx = 0, i = 0; i < policy->xfrm_nr; i++) { |
1da177e4 | 1374 | struct xfrm_state *x; |
94802151 SK |
1375 | xfrm_address_t *remote = daddr; |
1376 | xfrm_address_t *local = saddr; | |
1da177e4 LT |
1377 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; |
1378 | ||
94802151 SK |
1379 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1380 | tmpl->mode == XFRM_MODE_BEET) { | |
1381 | remote = &tmpl->id.daddr; | |
1382 | local = &tmpl->saddr; | |
1383 | if (xfrm_addr_any(local, tmpl->encap_family)) { | |
1384 | error = xfrm_get_saddr(net, fl->flowi_oif, | |
1385 | &tmp, remote, | |
1386 | tmpl->encap_family, 0); | |
1387 | if (error) | |
1388 | goto fail; | |
1389 | local = &tmp; | |
1390 | } | |
1da177e4 LT |
1391 | } |
1392 | ||
1393 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1394 | ||
1395 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1396 | xfrm[nx++] = x; | |
94802151 SK |
1397 | daddr = remote; |
1398 | saddr = local; | |
1da177e4 LT |
1399 | continue; |
1400 | } | |
1401 | if (x) { | |
1402 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1403 | -EINVAL : -EAGAIN); | |
1404 | xfrm_state_put(x); | |
42054569 | 1405 | } else if (error == -ESRCH) { |
a4322266 | 1406 | error = -EAGAIN; |
42054569 | 1407 | } |
1da177e4 LT |
1408 | |
1409 | if (!tmpl->optional) | |
1410 | goto fail; | |
1411 | } | |
1412 | return nx; | |
1413 | ||
1414 | fail: | |
9b7a787d | 1415 | for (nx--; nx >= 0; nx--) |
1da177e4 LT |
1416 | xfrm_state_put(xfrm[nx]); |
1417 | return error; | |
1418 | } | |
1419 | ||
4e81bb83 | 1420 | static int |
a6c2e611 DM |
1421 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl, |
1422 | struct xfrm_state **xfrm, unsigned short family) | |
4e81bb83 | 1423 | { |
41a49cc3 MN |
1424 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1425 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1426 | int cnx = 0; |
1427 | int error; | |
1428 | int ret; | |
1429 | int i; | |
1430 | ||
1431 | for (i = 0; i < npols; i++) { | |
1432 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1433 | error = -ENOBUFS; | |
1434 | goto fail; | |
1435 | } | |
41a49cc3 MN |
1436 | |
1437 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1438 | if (ret < 0) { |
1439 | error = ret; | |
1440 | goto fail; | |
1441 | } else | |
1442 | cnx += ret; | |
1443 | } | |
1444 | ||
41a49cc3 MN |
1445 | /* found states are sorted for outbound processing */ |
1446 | if (npols > 1) | |
1447 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1448 | ||
4e81bb83 MN |
1449 | return cnx; |
1450 | ||
1451 | fail: | |
9b7a787d | 1452 | for (cnx--; cnx >= 0; cnx--) |
41a49cc3 | 1453 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1454 | return error; |
1455 | ||
1456 | } | |
1457 | ||
f5e2bb4f | 1458 | static int xfrm_get_tos(const struct flowi *fl, int family) |
25ee3286 | 1459 | { |
37b10383 | 1460 | const struct xfrm_policy_afinfo *afinfo; |
7761f73a | 1461 | int tos; |
1da177e4 | 1462 | |
f5e2bb4f | 1463 | afinfo = xfrm_policy_get_afinfo(family); |
7761f73a XL |
1464 | if (!afinfo) |
1465 | return 0; | |
1466 | ||
1467 | tos = afinfo->get_tos(fl); | |
25ee3286 | 1468 | |
bdba9fe0 | 1469 | rcu_read_unlock(); |
25ee3286 HX |
1470 | |
1471 | return tos; | |
1472 | } | |
1473 | ||
d7c7544c | 1474 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1475 | { |
37b10383 | 1476 | const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1477 | struct dst_ops *dst_ops; |
25ee3286 HX |
1478 | struct xfrm_dst *xdst; |
1479 | ||
1480 | if (!afinfo) | |
1481 | return ERR_PTR(-EINVAL); | |
1482 | ||
d7c7544c AD |
1483 | switch (family) { |
1484 | case AF_INET: | |
1485 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1486 | break; | |
dfd56b8b | 1487 | #if IS_ENABLED(CONFIG_IPV6) |
d7c7544c AD |
1488 | case AF_INET6: |
1489 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1490 | break; | |
1491 | #endif | |
1492 | default: | |
1493 | BUG(); | |
1494 | } | |
b2a9c0ed | 1495 | xdst = dst_alloc(dst_ops, NULL, 1, DST_OBSOLETE_NONE, 0); |
25ee3286 | 1496 | |
d4cae562 | 1497 | if (likely(xdst)) { |
141e369d SK |
1498 | struct dst_entry *dst = &xdst->u.dst; |
1499 | ||
1500 | memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst)); | |
d4cae562 | 1501 | } else |
0b150932 | 1502 | xdst = ERR_PTR(-ENOBUFS); |
80c802f3 | 1503 | |
bdba9fe0 | 1504 | rcu_read_unlock(); |
d4cae562 | 1505 | |
25ee3286 HX |
1506 | return xdst; |
1507 | } | |
1508 | ||
a1b05140 MN |
1509 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1510 | int nfheader_len) | |
1511 | { | |
37b10383 | 1512 | const struct xfrm_policy_afinfo *afinfo = |
a1b05140 MN |
1513 | xfrm_policy_get_afinfo(dst->ops->family); |
1514 | int err; | |
1515 | ||
1516 | if (!afinfo) | |
1517 | return -EINVAL; | |
1518 | ||
1519 | err = afinfo->init_path(path, dst, nfheader_len); | |
1520 | ||
bdba9fe0 | 1521 | rcu_read_unlock(); |
a1b05140 MN |
1522 | |
1523 | return err; | |
1524 | } | |
1525 | ||
87c1e12b | 1526 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 1527 | const struct flowi *fl) |
25ee3286 | 1528 | { |
37b10383 | 1529 | const struct xfrm_policy_afinfo *afinfo = |
25ee3286 HX |
1530 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); |
1531 | int err; | |
1532 | ||
1533 | if (!afinfo) | |
1da177e4 | 1534 | return -EINVAL; |
25ee3286 | 1535 | |
87c1e12b | 1536 | err = afinfo->fill_dst(xdst, dev, fl); |
25ee3286 | 1537 | |
bdba9fe0 | 1538 | rcu_read_unlock(); |
25ee3286 | 1539 | |
1da177e4 LT |
1540 | return err; |
1541 | } | |
1542 | ||
80c802f3 | 1543 | |
25ee3286 HX |
1544 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1545 | * all the metrics... Shortly, bundle a bundle. | |
1546 | */ | |
1547 | ||
1548 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1549 | struct xfrm_state **xfrm, int nx, | |
98313ada | 1550 | const struct flowi *fl, |
25ee3286 HX |
1551 | struct dst_entry *dst) |
1552 | { | |
d7c7544c | 1553 | struct net *net = xp_net(policy); |
25ee3286 HX |
1554 | unsigned long now = jiffies; |
1555 | struct net_device *dev; | |
43a4dea4 | 1556 | struct xfrm_mode *inner_mode; |
25ee3286 HX |
1557 | struct dst_entry *dst_prev = NULL; |
1558 | struct dst_entry *dst0 = NULL; | |
1559 | int i = 0; | |
1560 | int err; | |
1561 | int header_len = 0; | |
a1b05140 | 1562 | int nfheader_len = 0; |
25ee3286 HX |
1563 | int trailer_len = 0; |
1564 | int tos; | |
1565 | int family = policy->selector.family; | |
9bb182a7 YH |
1566 | xfrm_address_t saddr, daddr; |
1567 | ||
1568 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1569 | |
1570 | tos = xfrm_get_tos(fl, family); | |
25ee3286 HX |
1571 | |
1572 | dst_hold(dst); | |
1573 | ||
1574 | for (; i < nx; i++) { | |
d7c7544c | 1575 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1576 | struct dst_entry *dst1 = &xdst->u.dst; |
1577 | ||
1578 | err = PTR_ERR(xdst); | |
1579 | if (IS_ERR(xdst)) { | |
1580 | dst_release(dst); | |
1581 | goto put_states; | |
1582 | } | |
1583 | ||
10a7ef33 DM |
1584 | if (!dst_prev) |
1585 | dst0 = dst1; | |
1586 | else | |
1587 | /* Ref count is taken during xfrm_alloc_dst() | |
1588 | * No need to do dst_clone() on dst1 | |
1589 | */ | |
1590 | dst_prev->child = dst1; | |
1591 | ||
43a4dea4 SK |
1592 | if (xfrm[i]->sel.family == AF_UNSPEC) { |
1593 | inner_mode = xfrm_ip2inner_mode(xfrm[i], | |
1594 | xfrm_af2proto(family)); | |
1595 | if (!inner_mode) { | |
1596 | err = -EAFNOSUPPORT; | |
1597 | dst_release(dst); | |
1598 | goto put_states; | |
1599 | } | |
1600 | } else | |
1601 | inner_mode = xfrm[i]->inner_mode; | |
1602 | ||
25ee3286 | 1603 | xdst->route = dst; |
defb3519 | 1604 | dst_copy_metrics(dst1, dst); |
25ee3286 HX |
1605 | |
1606 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1607 | family = xfrm[i]->props.family; | |
42a7b32b | 1608 | dst = xfrm_dst_lookup(xfrm[i], tos, fl->flowi_oif, |
077fbac4 LC |
1609 | &saddr, &daddr, family, |
1610 | xfrm[i]->props.output_mark); | |
25ee3286 HX |
1611 | err = PTR_ERR(dst); |
1612 | if (IS_ERR(dst)) | |
1613 | goto put_states; | |
1614 | } else | |
1615 | dst_hold(dst); | |
1616 | ||
1617 | dst1->xfrm = xfrm[i]; | |
80c802f3 | 1618 | xdst->xfrm_genid = xfrm[i]->genid; |
25ee3286 | 1619 | |
f5b0a874 | 1620 | dst1->obsolete = DST_OBSOLETE_FORCE_CHK; |
25ee3286 HX |
1621 | dst1->flags |= DST_HOST; |
1622 | dst1->lastuse = now; | |
1623 | ||
1624 | dst1->input = dst_discard; | |
43a4dea4 | 1625 | dst1->output = inner_mode->afinfo->output; |
25ee3286 HX |
1626 | |
1627 | dst1->next = dst_prev; | |
1628 | dst_prev = dst1; | |
1629 | ||
1630 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1631 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1632 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1633 | trailer_len += xfrm[i]->props.trailer_len; |
1634 | } | |
1635 | ||
1636 | dst_prev->child = dst; | |
1637 | dst0->path = dst; | |
1638 | ||
1639 | err = -ENODEV; | |
1640 | dev = dst->dev; | |
1641 | if (!dev) | |
1642 | goto free_dst; | |
1643 | ||
a1b05140 | 1644 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1645 | xfrm_init_pmtu(dst_prev); |
1646 | ||
1647 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1648 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1649 | ||
87c1e12b | 1650 | err = xfrm_fill_dst(xdst, dev, fl); |
25ee3286 HX |
1651 | if (err) |
1652 | goto free_dst; | |
1653 | ||
1654 | dst_prev->header_len = header_len; | |
1655 | dst_prev->trailer_len = trailer_len; | |
1656 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1657 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1658 | } | |
1659 | ||
1660 | out: | |
1661 | return dst0; | |
1662 | ||
1663 | put_states: | |
1664 | for (; i < nx; i++) | |
1665 | xfrm_state_put(xfrm[i]); | |
1666 | free_dst: | |
1667 | if (dst0) | |
52df157f | 1668 | dst_release_immediate(dst0); |
25ee3286 HX |
1669 | dst0 = ERR_PTR(err); |
1670 | goto out; | |
1671 | } | |
1672 | ||
73ff93cd | 1673 | static int xfrm_expand_policies(const struct flowi *fl, u16 family, |
80c802f3 TT |
1674 | struct xfrm_policy **pols, |
1675 | int *num_pols, int *num_xfrms) | |
1676 | { | |
1677 | int i; | |
1678 | ||
1679 | if (*num_pols == 0 || !pols[0]) { | |
1680 | *num_pols = 0; | |
1681 | *num_xfrms = 0; | |
1682 | return 0; | |
1683 | } | |
1684 | if (IS_ERR(pols[0])) | |
1685 | return PTR_ERR(pols[0]); | |
1686 | ||
1687 | *num_xfrms = pols[0]->xfrm_nr; | |
1688 | ||
1689 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1690 | if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW && | |
1691 | pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1692 | pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), | |
1693 | XFRM_POLICY_TYPE_MAIN, | |
1694 | fl, family, | |
1695 | XFRM_POLICY_OUT); | |
1696 | if (pols[1]) { | |
1697 | if (IS_ERR(pols[1])) { | |
1698 | xfrm_pols_put(pols, *num_pols); | |
1699 | return PTR_ERR(pols[1]); | |
1700 | } | |
02d0892f | 1701 | (*num_pols)++; |
80c802f3 TT |
1702 | (*num_xfrms) += pols[1]->xfrm_nr; |
1703 | } | |
1704 | } | |
1705 | #endif | |
1706 | for (i = 0; i < *num_pols; i++) { | |
1707 | if (pols[i]->action != XFRM_POLICY_ALLOW) { | |
1708 | *num_xfrms = -1; | |
1709 | break; | |
1710 | } | |
1711 | } | |
1712 | ||
1713 | return 0; | |
1714 | ||
1715 | } | |
1716 | ||
ec30d78c FW |
1717 | static void xfrm_last_dst_update(struct xfrm_dst *xdst, struct xfrm_dst *old) |
1718 | { | |
1719 | this_cpu_write(xfrm_last_dst, xdst); | |
1720 | if (old) | |
1721 | dst_release(&old->u.dst); | |
1722 | } | |
1723 | ||
1724 | static void __xfrm_pcpu_work_fn(void) | |
1725 | { | |
1726 | struct xfrm_dst *old; | |
1727 | ||
1728 | old = this_cpu_read(xfrm_last_dst); | |
1729 | if (old && !xfrm_bundle_ok(old)) | |
1730 | xfrm_last_dst_update(NULL, old); | |
1731 | } | |
1732 | ||
1733 | static void xfrm_pcpu_work_fn(struct work_struct *work) | |
1734 | { | |
1735 | local_bh_disable(); | |
1736 | rcu_read_lock(); | |
1737 | __xfrm_pcpu_work_fn(); | |
1738 | rcu_read_unlock(); | |
1739 | local_bh_enable(); | |
1740 | } | |
1741 | ||
1742 | void xfrm_policy_cache_flush(void) | |
1743 | { | |
1744 | struct xfrm_dst *old; | |
1745 | bool found = 0; | |
1746 | int cpu; | |
1747 | ||
b1bdcb59 FW |
1748 | might_sleep(); |
1749 | ||
ec30d78c FW |
1750 | local_bh_disable(); |
1751 | rcu_read_lock(); | |
1752 | for_each_possible_cpu(cpu) { | |
1753 | old = per_cpu(xfrm_last_dst, cpu); | |
1754 | if (old && !xfrm_bundle_ok(old)) { | |
1755 | if (smp_processor_id() == cpu) { | |
1756 | __xfrm_pcpu_work_fn(); | |
1757 | continue; | |
1758 | } | |
1759 | found = true; | |
1760 | break; | |
1761 | } | |
1762 | } | |
1763 | ||
1764 | rcu_read_unlock(); | |
1765 | local_bh_enable(); | |
1766 | ||
1767 | if (!found) | |
1768 | return; | |
1769 | ||
1770 | get_online_cpus(); | |
1771 | ||
1772 | for_each_possible_cpu(cpu) { | |
1773 | bool bundle_release; | |
1774 | ||
1775 | rcu_read_lock(); | |
1776 | old = per_cpu(xfrm_last_dst, cpu); | |
1777 | bundle_release = old && !xfrm_bundle_ok(old); | |
1778 | rcu_read_unlock(); | |
1779 | ||
1780 | if (!bundle_release) | |
1781 | continue; | |
1782 | ||
1783 | if (cpu_online(cpu)) { | |
1784 | schedule_work_on(cpu, &xfrm_pcpu_work[cpu]); | |
1785 | continue; | |
1786 | } | |
1787 | ||
1788 | rcu_read_lock(); | |
1789 | old = per_cpu(xfrm_last_dst, cpu); | |
1790 | if (old && !xfrm_bundle_ok(old)) { | |
1791 | per_cpu(xfrm_last_dst, cpu) = NULL; | |
1792 | dst_release(&old->u.dst); | |
1793 | } | |
1794 | rcu_read_unlock(); | |
1795 | } | |
1796 | ||
1797 | put_online_cpus(); | |
1798 | } | |
1799 | ||
cf379667 FW |
1800 | static bool xfrm_xdst_can_reuse(struct xfrm_dst *xdst, |
1801 | struct xfrm_state * const xfrm[], | |
1802 | int num) | |
ec30d78c | 1803 | { |
cf379667 FW |
1804 | const struct dst_entry *dst = &xdst->u.dst; |
1805 | int i; | |
ec30d78c | 1806 | |
cf379667 FW |
1807 | if (xdst->num_xfrms != num) |
1808 | return false; | |
ec30d78c | 1809 | |
cf379667 FW |
1810 | for (i = 0; i < num; i++) { |
1811 | if (!dst || dst->xfrm != xfrm[i]) | |
1812 | return false; | |
1813 | dst = dst->child; | |
1814 | } | |
ec30d78c | 1815 | |
cf379667 | 1816 | return xfrm_bundle_ok(xdst); |
ec30d78c FW |
1817 | } |
1818 | ||
80c802f3 TT |
1819 | static struct xfrm_dst * |
1820 | xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, | |
4ca2e685 | 1821 | const struct flowi *fl, u16 family, |
80c802f3 TT |
1822 | struct dst_entry *dst_orig) |
1823 | { | |
1824 | struct net *net = xp_net(pols[0]); | |
1825 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
ec30d78c | 1826 | struct xfrm_dst *xdst, *old; |
80c802f3 | 1827 | struct dst_entry *dst; |
80c802f3 TT |
1828 | int err; |
1829 | ||
cf379667 FW |
1830 | /* Try to instantiate a bundle */ |
1831 | err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); | |
1832 | if (err <= 0) { | |
1833 | if (err != 0 && err != -EAGAIN) | |
1834 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); | |
1835 | return ERR_PTR(err); | |
1836 | } | |
1837 | ||
ec30d78c FW |
1838 | xdst = this_cpu_read(xfrm_last_dst); |
1839 | if (xdst && | |
1840 | xdst->u.dst.dev == dst_orig->dev && | |
1841 | xdst->num_pols == num_pols && | |
ec30d78c | 1842 | memcmp(xdst->pols, pols, |
13ead5c4 | 1843 | sizeof(struct xfrm_policy *) * num_pols) == 0 && |
cf379667 | 1844 | xfrm_xdst_can_reuse(xdst, xfrm, err)) { |
ec30d78c | 1845 | dst_hold(&xdst->u.dst); |
d2950278 | 1846 | xfrm_pols_put(pols, num_pols); |
cf379667 FW |
1847 | while (err > 0) |
1848 | xfrm_state_put(xfrm[--err]); | |
ec30d78c FW |
1849 | return xdst; |
1850 | } | |
1851 | ||
1852 | old = xdst; | |
80c802f3 TT |
1853 | |
1854 | dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig); | |
1855 | if (IS_ERR(dst)) { | |
1856 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1857 | return ERR_CAST(dst); | |
1858 | } | |
1859 | ||
1860 | xdst = (struct xfrm_dst *)dst; | |
1861 | xdst->num_xfrms = err; | |
80c802f3 | 1862 | xdst->num_pols = num_pols; |
3e94c2dc | 1863 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 TT |
1864 | xdst->policy_genid = atomic_read(&pols[0]->genid); |
1865 | ||
ec30d78c FW |
1866 | atomic_set(&xdst->u.dst.__refcnt, 2); |
1867 | xfrm_last_dst_update(xdst, old); | |
1868 | ||
80c802f3 TT |
1869 | return xdst; |
1870 | } | |
1871 | ||
c3aed709 | 1872 | static void xfrm_policy_queue_process(struct timer_list *t) |
a0073fe1 | 1873 | { |
a0073fe1 SK |
1874 | struct sk_buff *skb; |
1875 | struct sock *sk; | |
1876 | struct dst_entry *dst; | |
c3aed709 | 1877 | struct xfrm_policy *pol = from_timer(pol, t, polq.hold_timer); |
3f5312ae | 1878 | struct net *net = xp_net(pol); |
a0073fe1 SK |
1879 | struct xfrm_policy_queue *pq = &pol->polq; |
1880 | struct flowi fl; | |
1881 | struct sk_buff_head list; | |
1882 | ||
1883 | spin_lock(&pq->hold_queue.lock); | |
1884 | skb = skb_peek(&pq->hold_queue); | |
2bb53e25 SK |
1885 | if (!skb) { |
1886 | spin_unlock(&pq->hold_queue.lock); | |
1887 | goto out; | |
1888 | } | |
a0073fe1 SK |
1889 | dst = skb_dst(skb); |
1890 | sk = skb->sk; | |
1891 | xfrm_decode_session(skb, &fl, dst->ops->family); | |
1892 | spin_unlock(&pq->hold_queue.lock); | |
1893 | ||
1894 | dst_hold(dst->path); | |
3f5312ae | 1895 | dst = xfrm_lookup(net, dst->path, &fl, sk, 0); |
a0073fe1 SK |
1896 | if (IS_ERR(dst)) |
1897 | goto purge_queue; | |
1898 | ||
1899 | if (dst->flags & DST_XFRM_QUEUE) { | |
1900 | dst_release(dst); | |
1901 | ||
1902 | if (pq->timeout >= XFRM_QUEUE_TMO_MAX) | |
1903 | goto purge_queue; | |
1904 | ||
1905 | pq->timeout = pq->timeout << 1; | |
e7d8f6cb SK |
1906 | if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout)) |
1907 | xfrm_pol_hold(pol); | |
1908 | goto out; | |
a0073fe1 SK |
1909 | } |
1910 | ||
1911 | dst_release(dst); | |
1912 | ||
1913 | __skb_queue_head_init(&list); | |
1914 | ||
1915 | spin_lock(&pq->hold_queue.lock); | |
1916 | pq->timeout = 0; | |
1917 | skb_queue_splice_init(&pq->hold_queue, &list); | |
1918 | spin_unlock(&pq->hold_queue.lock); | |
1919 | ||
1920 | while (!skb_queue_empty(&list)) { | |
1921 | skb = __skb_dequeue(&list); | |
1922 | ||
1923 | xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family); | |
1924 | dst_hold(skb_dst(skb)->path); | |
3f5312ae | 1925 | dst = xfrm_lookup(net, skb_dst(skb)->path, &fl, skb->sk, 0); |
a0073fe1 | 1926 | if (IS_ERR(dst)) { |
a0073fe1 SK |
1927 | kfree_skb(skb); |
1928 | continue; | |
1929 | } | |
1930 | ||
1931 | nf_reset(skb); | |
1932 | skb_dst_drop(skb); | |
1933 | skb_dst_set(skb, dst); | |
1934 | ||
13206b6b | 1935 | dst_output(net, skb->sk, skb); |
a0073fe1 SK |
1936 | } |
1937 | ||
e7d8f6cb SK |
1938 | out: |
1939 | xfrm_pol_put(pol); | |
a0073fe1 SK |
1940 | return; |
1941 | ||
1942 | purge_queue: | |
1943 | pq->timeout = 0; | |
1ee5e667 | 1944 | skb_queue_purge(&pq->hold_queue); |
e7d8f6cb | 1945 | xfrm_pol_put(pol); |
a0073fe1 SK |
1946 | } |
1947 | ||
ede2059d | 1948 | static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
a0073fe1 SK |
1949 | { |
1950 | unsigned long sched_next; | |
1951 | struct dst_entry *dst = skb_dst(skb); | |
1952 | struct xfrm_dst *xdst = (struct xfrm_dst *) dst; | |
e7d8f6cb SK |
1953 | struct xfrm_policy *pol = xdst->pols[0]; |
1954 | struct xfrm_policy_queue *pq = &pol->polq; | |
4d53eff4 | 1955 | |
39bb5e62 | 1956 | if (unlikely(skb_fclone_busy(sk, skb))) { |
4d53eff4 SK |
1957 | kfree_skb(skb); |
1958 | return 0; | |
1959 | } | |
a0073fe1 SK |
1960 | |
1961 | if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) { | |
1962 | kfree_skb(skb); | |
1963 | return -EAGAIN; | |
1964 | } | |
1965 | ||
1966 | skb_dst_force(skb); | |
a0073fe1 SK |
1967 | |
1968 | spin_lock_bh(&pq->hold_queue.lock); | |
1969 | ||
1970 | if (!pq->timeout) | |
1971 | pq->timeout = XFRM_QUEUE_TMO_MIN; | |
1972 | ||
1973 | sched_next = jiffies + pq->timeout; | |
1974 | ||
1975 | if (del_timer(&pq->hold_timer)) { | |
1976 | if (time_before(pq->hold_timer.expires, sched_next)) | |
1977 | sched_next = pq->hold_timer.expires; | |
e7d8f6cb | 1978 | xfrm_pol_put(pol); |
a0073fe1 SK |
1979 | } |
1980 | ||
1981 | __skb_queue_tail(&pq->hold_queue, skb); | |
e7d8f6cb SK |
1982 | if (!mod_timer(&pq->hold_timer, sched_next)) |
1983 | xfrm_pol_hold(pol); | |
a0073fe1 SK |
1984 | |
1985 | spin_unlock_bh(&pq->hold_queue.lock); | |
1986 | ||
1987 | return 0; | |
1988 | } | |
1989 | ||
1990 | static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net, | |
b8c203b2 | 1991 | struct xfrm_flo *xflo, |
a0073fe1 SK |
1992 | const struct flowi *fl, |
1993 | int num_xfrms, | |
1994 | u16 family) | |
1995 | { | |
1996 | int err; | |
1997 | struct net_device *dev; | |
b8c203b2 | 1998 | struct dst_entry *dst; |
a0073fe1 SK |
1999 | struct dst_entry *dst1; |
2000 | struct xfrm_dst *xdst; | |
2001 | ||
2002 | xdst = xfrm_alloc_dst(net, family); | |
2003 | if (IS_ERR(xdst)) | |
2004 | return xdst; | |
2005 | ||
b8c203b2 SK |
2006 | if (!(xflo->flags & XFRM_LOOKUP_QUEUE) || |
2007 | net->xfrm.sysctl_larval_drop || | |
2008 | num_xfrms <= 0) | |
a0073fe1 SK |
2009 | return xdst; |
2010 | ||
b8c203b2 | 2011 | dst = xflo->dst_orig; |
a0073fe1 SK |
2012 | dst1 = &xdst->u.dst; |
2013 | dst_hold(dst); | |
2014 | xdst->route = dst; | |
2015 | ||
2016 | dst_copy_metrics(dst1, dst); | |
2017 | ||
2018 | dst1->obsolete = DST_OBSOLETE_FORCE_CHK; | |
2019 | dst1->flags |= DST_HOST | DST_XFRM_QUEUE; | |
2020 | dst1->lastuse = jiffies; | |
2021 | ||
2022 | dst1->input = dst_discard; | |
2023 | dst1->output = xdst_queue_output; | |
2024 | ||
2025 | dst_hold(dst); | |
2026 | dst1->child = dst; | |
2027 | dst1->path = dst; | |
2028 | ||
2029 | xfrm_init_path((struct xfrm_dst *)dst1, dst, 0); | |
2030 | ||
2031 | err = -ENODEV; | |
2032 | dev = dst->dev; | |
2033 | if (!dev) | |
2034 | goto free_dst; | |
2035 | ||
2036 | err = xfrm_fill_dst(xdst, dev, fl); | |
2037 | if (err) | |
2038 | goto free_dst; | |
2039 | ||
2040 | out: | |
2041 | return xdst; | |
2042 | ||
2043 | free_dst: | |
2044 | dst_release(dst1); | |
2045 | xdst = ERR_PTR(err); | |
2046 | goto out; | |
2047 | } | |
2048 | ||
bd45c539 | 2049 | static struct xfrm_dst * |
3ca28286 | 2050 | xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir, struct xfrm_flo *xflo) |
80c802f3 | 2051 | { |
80c802f3 | 2052 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
855dad99 | 2053 | int num_pols = 0, num_xfrms = 0, err; |
bd45c539 | 2054 | struct xfrm_dst *xdst; |
80c802f3 | 2055 | |
80c802f3 TT |
2056 | /* Resolve policies to use if we couldn't get them from |
2057 | * previous cache entry */ | |
855dad99 | 2058 | num_pols = 1; |
86dc8ee0 | 2059 | pols[0] = xfrm_policy_lookup(net, fl, family, dir); |
855dad99 | 2060 | err = xfrm_expand_policies(fl, family, pols, |
80c802f3 | 2061 | &num_pols, &num_xfrms); |
855dad99 FW |
2062 | if (err < 0) |
2063 | goto inc_error; | |
2064 | if (num_pols == 0) | |
2065 | return NULL; | |
2066 | if (num_xfrms <= 0) | |
2067 | goto make_dummy_bundle; | |
80c802f3 | 2068 | |
76a42011 | 2069 | local_bh_disable(); |
bd45c539 | 2070 | xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, |
76a42011 SK |
2071 | xflo->dst_orig); |
2072 | local_bh_enable(); | |
2073 | ||
bd45c539 FW |
2074 | if (IS_ERR(xdst)) { |
2075 | err = PTR_ERR(xdst); | |
80c802f3 TT |
2076 | if (err != -EAGAIN) |
2077 | goto error; | |
855dad99 | 2078 | goto make_dummy_bundle; |
bd45c539 | 2079 | } else if (xdst == NULL) { |
d809ec89 | 2080 | num_xfrms = 0; |
855dad99 | 2081 | goto make_dummy_bundle; |
80c802f3 TT |
2082 | } |
2083 | ||
bd45c539 | 2084 | return xdst; |
80c802f3 TT |
2085 | |
2086 | make_dummy_bundle: | |
2087 | /* We found policies, but there's no bundles to instantiate: | |
2088 | * either because the policy blocks, has no transformations or | |
2089 | * we could not build template (no xfrm_states).*/ | |
b8c203b2 | 2090 | xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family); |
80c802f3 TT |
2091 | if (IS_ERR(xdst)) { |
2092 | xfrm_pols_put(pols, num_pols); | |
2093 | return ERR_CAST(xdst); | |
2094 | } | |
2095 | xdst->num_pols = num_pols; | |
2096 | xdst->num_xfrms = num_xfrms; | |
3e94c2dc | 2097 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 | 2098 | |
bd45c539 | 2099 | return xdst; |
80c802f3 TT |
2100 | |
2101 | inc_error: | |
2102 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); | |
2103 | error: | |
855dad99 | 2104 | xfrm_pols_put(pols, num_pols); |
80c802f3 TT |
2105 | return ERR_PTR(err); |
2106 | } | |
1da177e4 | 2107 | |
2774c131 DM |
2108 | static struct dst_entry *make_blackhole(struct net *net, u16 family, |
2109 | struct dst_entry *dst_orig) | |
2110 | { | |
37b10383 | 2111 | const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
2774c131 DM |
2112 | struct dst_entry *ret; |
2113 | ||
2114 | if (!afinfo) { | |
2115 | dst_release(dst_orig); | |
433a1954 | 2116 | return ERR_PTR(-EINVAL); |
2774c131 DM |
2117 | } else { |
2118 | ret = afinfo->blackhole_route(net, dst_orig); | |
2119 | } | |
bdba9fe0 | 2120 | rcu_read_unlock(); |
2774c131 DM |
2121 | |
2122 | return ret; | |
2123 | } | |
2124 | ||
1da177e4 LT |
2125 | /* Main function: finds/creates a bundle for given flow. |
2126 | * | |
2127 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
2128 | * on interfaces with disabled IPsec. | |
2129 | */ | |
452edd59 DM |
2130 | struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, |
2131 | const struct flowi *fl, | |
6f9c9615 | 2132 | const struct sock *sk, int flags) |
1da177e4 | 2133 | { |
4e81bb83 | 2134 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
80c802f3 | 2135 | struct xfrm_dst *xdst; |
452edd59 | 2136 | struct dst_entry *dst, *route; |
80c802f3 | 2137 | u16 family = dst_orig->ops->family; |
aff669bc | 2138 | u8 dir = XFRM_POLICY_OUT; |
4b021628 | 2139 | int i, err, num_pols, num_xfrms = 0, drop_pols = 0; |
e0d1caa7 | 2140 | |
80c802f3 TT |
2141 | dst = NULL; |
2142 | xdst = NULL; | |
2143 | route = NULL; | |
4e81bb83 | 2144 | |
bd5eb35f | 2145 | sk = sk_const_to_full_sk(sk); |
f7944fb1 | 2146 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
80c802f3 | 2147 | num_pols = 1; |
4c86d777 | 2148 | pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, family); |
80c802f3 TT |
2149 | err = xfrm_expand_policies(fl, family, pols, |
2150 | &num_pols, &num_xfrms); | |
2151 | if (err < 0) | |
75b8c133 | 2152 | goto dropdst; |
80c802f3 TT |
2153 | |
2154 | if (num_pols) { | |
2155 | if (num_xfrms <= 0) { | |
2156 | drop_pols = num_pols; | |
2157 | goto no_transform; | |
2158 | } | |
2159 | ||
76a42011 | 2160 | local_bh_disable(); |
80c802f3 TT |
2161 | xdst = xfrm_resolve_and_create_bundle( |
2162 | pols, num_pols, fl, | |
2163 | family, dst_orig); | |
76a42011 SK |
2164 | local_bh_enable(); |
2165 | ||
80c802f3 TT |
2166 | if (IS_ERR(xdst)) { |
2167 | xfrm_pols_put(pols, num_pols); | |
2168 | err = PTR_ERR(xdst); | |
2169 | goto dropdst; | |
d809ec89 TT |
2170 | } else if (xdst == NULL) { |
2171 | num_xfrms = 0; | |
2172 | drop_pols = num_pols; | |
2173 | goto no_transform; | |
80c802f3 TT |
2174 | } |
2175 | ||
80c802f3 | 2176 | route = xdst->route; |
0aa64774 | 2177 | } |
3bccfbc7 | 2178 | } |
1da177e4 | 2179 | |
80c802f3 | 2180 | if (xdst == NULL) { |
b8c203b2 SK |
2181 | struct xfrm_flo xflo; |
2182 | ||
2183 | xflo.dst_orig = dst_orig; | |
2184 | xflo.flags = flags; | |
2185 | ||
1da177e4 | 2186 | /* To accelerate a bit... */ |
2518c7c2 | 2187 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 2188 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 2189 | goto nopol; |
1da177e4 | 2190 | |
bd45c539 FW |
2191 | xdst = xfrm_bundle_lookup(net, fl, family, dir, &xflo); |
2192 | if (xdst == NULL) | |
80c802f3 | 2193 | goto nopol; |
bd45c539 FW |
2194 | if (IS_ERR(xdst)) { |
2195 | err = PTR_ERR(xdst); | |
75b8c133 | 2196 | goto dropdst; |
d66e37a9 | 2197 | } |
80c802f3 TT |
2198 | |
2199 | num_pols = xdst->num_pols; | |
2200 | num_xfrms = xdst->num_xfrms; | |
3e94c2dc | 2201 | memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 TT |
2202 | route = xdst->route; |
2203 | } | |
2204 | ||
2205 | dst = &xdst->u.dst; | |
2206 | if (route == NULL && num_xfrms > 0) { | |
2207 | /* The only case when xfrm_bundle_lookup() returns a | |
2208 | * bundle with null route, is when the template could | |
2209 | * not be resolved. It means policies are there, but | |
2210 | * bundle could not be created, since we don't yet | |
2211 | * have the xfrm_state's. We need to wait for KM to | |
2212 | * negotiate new SA's or bail out with error.*/ | |
2213 | if (net->xfrm.sysctl_larval_drop) { | |
80c802f3 | 2214 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
ac37e251 W |
2215 | err = -EREMOTE; |
2216 | goto error; | |
80c802f3 | 2217 | } |
80c802f3 | 2218 | |
5b8ef341 | 2219 | err = -EAGAIN; |
80c802f3 TT |
2220 | |
2221 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); | |
2222 | goto error; | |
1da177e4 LT |
2223 | } |
2224 | ||
80c802f3 TT |
2225 | no_transform: |
2226 | if (num_pols == 0) | |
8b7817f3 | 2227 | goto nopol; |
1da177e4 | 2228 | |
80c802f3 TT |
2229 | if ((flags & XFRM_LOOKUP_ICMP) && |
2230 | !(pols[0]->flags & XFRM_POLICY_ICMP)) { | |
2231 | err = -ENOENT; | |
8b7817f3 | 2232 | goto error; |
80c802f3 | 2233 | } |
8b7817f3 | 2234 | |
80c802f3 TT |
2235 | for (i = 0; i < num_pols; i++) |
2236 | pols[i]->curlft.use_time = get_seconds(); | |
8b7817f3 | 2237 | |
80c802f3 | 2238 | if (num_xfrms < 0) { |
1da177e4 | 2239 | /* Prohibit the flow */ |
59c9940e | 2240 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
2241 | err = -EPERM; |
2242 | goto error; | |
80c802f3 TT |
2243 | } else if (num_xfrms > 0) { |
2244 | /* Flow transformed */ | |
80c802f3 TT |
2245 | dst_release(dst_orig); |
2246 | } else { | |
2247 | /* Flow passes untransformed */ | |
2248 | dst_release(dst); | |
452edd59 | 2249 | dst = dst_orig; |
1da177e4 | 2250 | } |
80c802f3 TT |
2251 | ok: |
2252 | xfrm_pols_put(pols, drop_pols); | |
0c183379 G |
2253 | if (dst && dst->xfrm && |
2254 | dst->xfrm->props.mode == XFRM_MODE_TUNNEL) | |
2255 | dst->flags |= DST_XFRM_TUNNEL; | |
452edd59 | 2256 | return dst; |
1da177e4 | 2257 | |
80c802f3 | 2258 | nopol: |
452edd59 DM |
2259 | if (!(flags & XFRM_LOOKUP_ICMP)) { |
2260 | dst = dst_orig; | |
80c802f3 | 2261 | goto ok; |
452edd59 | 2262 | } |
80c802f3 | 2263 | err = -ENOENT; |
1da177e4 | 2264 | error: |
80c802f3 | 2265 | dst_release(dst); |
75b8c133 | 2266 | dropdst: |
ac37e251 W |
2267 | if (!(flags & XFRM_LOOKUP_KEEP_DST_REF)) |
2268 | dst_release(dst_orig); | |
80c802f3 | 2269 | xfrm_pols_put(pols, drop_pols); |
452edd59 | 2270 | return ERR_PTR(err); |
1da177e4 LT |
2271 | } |
2272 | EXPORT_SYMBOL(xfrm_lookup); | |
2273 | ||
f92ee619 SK |
2274 | /* Callers of xfrm_lookup_route() must ensure a call to dst_output(). |
2275 | * Otherwise we may send out blackholed packets. | |
2276 | */ | |
2277 | struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig, | |
2278 | const struct flowi *fl, | |
6f9c9615 | 2279 | const struct sock *sk, int flags) |
f92ee619 | 2280 | { |
b8c203b2 | 2281 | struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk, |
ac37e251 W |
2282 | flags | XFRM_LOOKUP_QUEUE | |
2283 | XFRM_LOOKUP_KEEP_DST_REF); | |
f92ee619 SK |
2284 | |
2285 | if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE) | |
2286 | return make_blackhole(net, dst_orig->ops->family, dst_orig); | |
2287 | ||
2288 | return dst; | |
2289 | } | |
2290 | EXPORT_SYMBOL(xfrm_lookup_route); | |
2291 | ||
df0ba92a | 2292 | static inline int |
8f029de2 | 2293 | xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl) |
df0ba92a MN |
2294 | { |
2295 | struct xfrm_state *x; | |
df0ba92a MN |
2296 | |
2297 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
2298 | return 0; | |
2299 | x = skb->sp->xvec[idx]; | |
2300 | if (!x->type->reject) | |
2301 | return 0; | |
1ecafede | 2302 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
2303 | } |
2304 | ||
1da177e4 LT |
2305 | /* When skb is transformed back to its "native" form, we have to |
2306 | * check policy restrictions. At the moment we make this in maximally | |
2307 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
2308 | * have policy cached at them. | |
2309 | */ | |
2310 | ||
2311 | static inline int | |
7db454b9 | 2312 | xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, |
1da177e4 LT |
2313 | unsigned short family) |
2314 | { | |
2315 | if (xfrm_state_kern(x)) | |
928ba416 | 2316 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
2317 | return x->id.proto == tmpl->id.proto && |
2318 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
2319 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
2320 | x->props.mode == tmpl->mode && | |
c5d18e98 | 2321 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 2322 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
2323 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
2324 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
2325 | } |
2326 | ||
df0ba92a MN |
2327 | /* |
2328 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
2329 | * because of optional transport mode, or next index of the mathced secpath | |
2330 | * state with the template. | |
2331 | * -1 is returned when no matching template is found. | |
2332 | * Otherwise "-2 - errored_index" is returned. | |
2333 | */ | |
1da177e4 | 2334 | static inline int |
22cccb7e | 2335 | xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start, |
1da177e4 LT |
2336 | unsigned short family) |
2337 | { | |
2338 | int idx = start; | |
2339 | ||
2340 | if (tmpl->optional) { | |
7e49e6de | 2341 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
2342 | return start; |
2343 | } else | |
2344 | start = -1; | |
2345 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 2346 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 2347 | return ++idx; |
df0ba92a MN |
2348 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
2349 | if (start == -1) | |
2350 | start = -2-idx; | |
1da177e4 | 2351 | break; |
df0ba92a | 2352 | } |
1da177e4 LT |
2353 | } |
2354 | return start; | |
2355 | } | |
2356 | ||
d5422efe HX |
2357 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
2358 | unsigned int family, int reverse) | |
1da177e4 | 2359 | { |
37b10383 | 2360 | const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
e0d1caa7 | 2361 | int err; |
1da177e4 LT |
2362 | |
2363 | if (unlikely(afinfo == NULL)) | |
2364 | return -EAFNOSUPPORT; | |
2365 | ||
d5422efe | 2366 | afinfo->decode_session(skb, fl, reverse); |
1d28f42c | 2367 | err = security_xfrm_decode_session(skb, &fl->flowi_secid); |
bdba9fe0 | 2368 | rcu_read_unlock(); |
e0d1caa7 | 2369 | return err; |
1da177e4 | 2370 | } |
d5422efe | 2371 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 2372 | |
9a7386ec | 2373 | static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
2374 | { |
2375 | for (; k < sp->len; k++) { | |
df0ba92a | 2376 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 2377 | *idxp = k; |
1da177e4 | 2378 | return 1; |
df0ba92a | 2379 | } |
1da177e4 LT |
2380 | } |
2381 | ||
2382 | return 0; | |
2383 | } | |
2384 | ||
a716c119 | 2385 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
2386 | unsigned short family) |
2387 | { | |
f6e1e25d | 2388 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2389 | struct xfrm_policy *pol; |
4e81bb83 MN |
2390 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2391 | int npols = 0; | |
2392 | int xfrm_nr; | |
2393 | int pi; | |
d5422efe | 2394 | int reverse; |
1da177e4 | 2395 | struct flowi fl; |
df0ba92a | 2396 | int xerr_idx = -1; |
1da177e4 | 2397 | |
d5422efe HX |
2398 | reverse = dir & ~XFRM_POLICY_MASK; |
2399 | dir &= XFRM_POLICY_MASK; | |
d5422efe | 2400 | |
0aa64774 | 2401 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 2402 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 2403 | return 0; |
0aa64774 MN |
2404 | } |
2405 | ||
eb9c7ebe | 2406 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
2407 | |
2408 | /* First, check used SA against their selectors. */ | |
2409 | if (skb->sp) { | |
2410 | int i; | |
2411 | ||
9b7a787d | 2412 | for (i = skb->sp->len-1; i >= 0; i--) { |
dbe5b4aa | 2413 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 2414 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 2415 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 2416 | return 0; |
0aa64774 | 2417 | } |
1da177e4 LT |
2418 | } |
2419 | } | |
2420 | ||
2421 | pol = NULL; | |
bd5eb35f | 2422 | sk = sk_to_full_sk(sk); |
3bccfbc7 | 2423 | if (sk && sk->sk_policy[dir]) { |
4c86d777 | 2424 | pol = xfrm_sk_policy_lookup(sk, dir, &fl, family); |
0aa64774 | 2425 | if (IS_ERR(pol)) { |
59c9940e | 2426 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 2427 | return 0; |
0aa64774 | 2428 | } |
3bccfbc7 | 2429 | } |
1da177e4 | 2430 | |
86dc8ee0 FW |
2431 | if (!pol) |
2432 | pol = xfrm_policy_lookup(net, &fl, family, dir); | |
1da177e4 | 2433 | |
0aa64774 | 2434 | if (IS_ERR(pol)) { |
59c9940e | 2435 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2436 | return 0; |
0aa64774 | 2437 | } |
134b0fc5 | 2438 | |
df0ba92a | 2439 | if (!pol) { |
d1d9facf | 2440 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 2441 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 2442 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
2443 | return 0; |
2444 | } | |
2445 | return 1; | |
2446 | } | |
1da177e4 | 2447 | |
9d729f72 | 2448 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 2449 | |
4e81bb83 | 2450 | pols[0] = pol; |
02d0892f | 2451 | npols++; |
4e81bb83 MN |
2452 | #ifdef CONFIG_XFRM_SUB_POLICY |
2453 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 2454 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
2455 | &fl, family, |
2456 | XFRM_POLICY_IN); | |
2457 | if (pols[1]) { | |
0aa64774 | 2458 | if (IS_ERR(pols[1])) { |
59c9940e | 2459 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2460 | return 0; |
0aa64774 | 2461 | } |
9d729f72 | 2462 | pols[1]->curlft.use_time = get_seconds(); |
02d0892f | 2463 | npols++; |
4e81bb83 MN |
2464 | } |
2465 | } | |
2466 | #endif | |
2467 | ||
1da177e4 LT |
2468 | if (pol->action == XFRM_POLICY_ALLOW) { |
2469 | struct sec_path *sp; | |
2470 | static struct sec_path dummy; | |
4e81bb83 | 2471 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 2472 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
2473 | struct xfrm_tmpl **tpp = tp; |
2474 | int ti = 0; | |
1da177e4 LT |
2475 | int i, k; |
2476 | ||
2477 | if ((sp = skb->sp) == NULL) | |
2478 | sp = &dummy; | |
2479 | ||
4e81bb83 MN |
2480 | for (pi = 0; pi < npols; pi++) { |
2481 | if (pols[pi] != pol && | |
0aa64774 | 2482 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 2483 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 2484 | goto reject; |
0aa64774 MN |
2485 | } |
2486 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 2487 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 2488 | goto reject_error; |
0aa64774 | 2489 | } |
4e81bb83 MN |
2490 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2491 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2492 | } | |
2493 | xfrm_nr = ti; | |
41a49cc3 | 2494 | if (npols > 1) { |
283bc9f3 | 2495 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net); |
41a49cc3 MN |
2496 | tpp = stp; |
2497 | } | |
4e81bb83 | 2498 | |
1da177e4 LT |
2499 | /* For each tunnel xfrm, find the first matching tmpl. |
2500 | * For each tmpl before that, find corresponding xfrm. | |
2501 | * Order is _important_. Later we will implement | |
2502 | * some barriers, but at the moment barriers | |
2503 | * are implied between each two transformations. | |
2504 | */ | |
4e81bb83 MN |
2505 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2506 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2507 | if (k < 0) { |
d1d9facf JM |
2508 | if (k < -1) |
2509 | /* "-2 - errored_index" returned */ | |
2510 | xerr_idx = -(2+k); | |
59c9940e | 2511 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2512 | goto reject; |
df0ba92a | 2513 | } |
1da177e4 LT |
2514 | } |
2515 | ||
0aa64774 | 2516 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2517 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2518 | goto reject; |
0aa64774 | 2519 | } |
1da177e4 | 2520 | |
4e81bb83 | 2521 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2522 | return 1; |
2523 | } | |
59c9940e | 2524 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2525 | |
2526 | reject: | |
df0ba92a | 2527 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2528 | reject_error: |
2529 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2530 | return 0; |
2531 | } | |
2532 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2533 | ||
2534 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2535 | { | |
99a66657 | 2536 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2537 | struct flowi fl; |
adf30907 | 2538 | struct dst_entry *dst; |
73137147 | 2539 | int res = 1; |
1da177e4 | 2540 | |
0aa64774 | 2541 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
72032fdb | 2542 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
1da177e4 | 2543 | return 0; |
0aa64774 | 2544 | } |
1da177e4 | 2545 | |
fafeeb6c | 2546 | skb_dst_force(skb); |
0d4169ed SK |
2547 | if (!skb_dst(skb)) { |
2548 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); | |
2549 | return 0; | |
2550 | } | |
adf30907 | 2551 | |
b8c203b2 | 2552 | dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE); |
452edd59 | 2553 | if (IS_ERR(dst)) { |
73137147 | 2554 | res = 0; |
452edd59 DM |
2555 | dst = NULL; |
2556 | } | |
adf30907 ED |
2557 | skb_dst_set(skb, dst); |
2558 | return res; | |
1da177e4 LT |
2559 | } |
2560 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2561 | ||
d49c73c7 DM |
2562 | /* Optimize later using cookies and generation ids. */ |
2563 | ||
1da177e4 LT |
2564 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2565 | { | |
d49c73c7 | 2566 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
f5b0a874 DM |
2567 | * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to |
2568 | * get validated by dst_ops->check on every use. We do this | |
2569 | * because when a normal route referenced by an XFRM dst is | |
2570 | * obsoleted we do not go looking around for all parent | |
2571 | * referencing XFRM dsts so that we can invalidate them. It | |
2572 | * is just too much work. Instead we make the checks here on | |
2573 | * every use. For example: | |
d49c73c7 DM |
2574 | * |
2575 | * XFRM dst A --> IPv4 dst X | |
2576 | * | |
2577 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2578 | * in this example). If X is marked obsolete, "A" will not | |
2579 | * notice. That's what we are validating here via the | |
2580 | * stale_bundle() check. | |
2581 | * | |
52df157f WW |
2582 | * When a dst is removed from the fib tree, DST_OBSOLETE_DEAD will |
2583 | * be marked on it. | |
09c75704 | 2584 | * This will force stale_bundle() to fail on any xdst bundle with |
52df157f | 2585 | * this dst linked in it. |
399c180a | 2586 | */ |
d49c73c7 DM |
2587 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2588 | return dst; | |
2589 | ||
1da177e4 LT |
2590 | return NULL; |
2591 | } | |
2592 | ||
2593 | static int stale_bundle(struct dst_entry *dst) | |
2594 | { | |
12fdb4d3 | 2595 | return !xfrm_bundle_ok((struct xfrm_dst *)dst); |
1da177e4 LT |
2596 | } |
2597 | ||
aabc9761 | 2598 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2599 | { |
1da177e4 | 2600 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2601 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2602 | dev_hold(dst->dev); |
1da177e4 LT |
2603 | dev_put(dev); |
2604 | } | |
2605 | } | |
aabc9761 | 2606 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2607 | |
2608 | static void xfrm_link_failure(struct sk_buff *skb) | |
2609 | { | |
2610 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1da177e4 LT |
2611 | } |
2612 | ||
2613 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2614 | { | |
2615 | if (dst) { | |
2616 | if (dst->obsolete) { | |
2617 | dst_release(dst); | |
2618 | dst = NULL; | |
2619 | } | |
2620 | } | |
2621 | return dst; | |
2622 | } | |
2623 | ||
25ee3286 | 2624 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2625 | { |
2626 | do { | |
2627 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2628 | u32 pmtu, route_mtu_cached; | |
2629 | ||
2630 | pmtu = dst_mtu(dst->child); | |
2631 | xdst->child_mtu_cached = pmtu; | |
2632 | ||
2633 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2634 | ||
2635 | route_mtu_cached = dst_mtu(xdst->route); | |
2636 | xdst->route_mtu_cached = route_mtu_cached; | |
2637 | ||
2638 | if (pmtu > route_mtu_cached) | |
2639 | pmtu = route_mtu_cached; | |
2640 | ||
defb3519 | 2641 | dst_metric_set(dst, RTAX_MTU, pmtu); |
1da177e4 LT |
2642 | } while ((dst = dst->next)); |
2643 | } | |
2644 | ||
1da177e4 LT |
2645 | /* Check that the bundle accepts the flow and its components are |
2646 | * still valid. | |
2647 | */ | |
2648 | ||
12fdb4d3 | 2649 | static int xfrm_bundle_ok(struct xfrm_dst *first) |
1da177e4 LT |
2650 | { |
2651 | struct dst_entry *dst = &first->u.dst; | |
2652 | struct xfrm_dst *last; | |
2653 | u32 mtu; | |
2654 | ||
92d63dec | 2655 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2656 | (dst->dev && !netif_running(dst->dev))) |
2657 | return 0; | |
2658 | ||
a0073fe1 SK |
2659 | if (dst->flags & DST_XFRM_QUEUE) |
2660 | return 1; | |
2661 | ||
1da177e4 LT |
2662 | last = NULL; |
2663 | ||
2664 | do { | |
2665 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2666 | ||
1da177e4 LT |
2667 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2668 | return 0; | |
80c802f3 TT |
2669 | if (xdst->xfrm_genid != dst->xfrm->genid) |
2670 | return 0; | |
b1312c89 TT |
2671 | if (xdst->num_pols > 0 && |
2672 | xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) | |
9d4a706d | 2673 | return 0; |
e53820de | 2674 | |
1da177e4 LT |
2675 | mtu = dst_mtu(dst->child); |
2676 | if (xdst->child_mtu_cached != mtu) { | |
2677 | last = xdst; | |
2678 | xdst->child_mtu_cached = mtu; | |
2679 | } | |
2680 | ||
92d63dec | 2681 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2682 | return 0; |
2683 | mtu = dst_mtu(xdst->route); | |
2684 | if (xdst->route_mtu_cached != mtu) { | |
2685 | last = xdst; | |
2686 | xdst->route_mtu_cached = mtu; | |
2687 | } | |
2688 | ||
2689 | dst = dst->child; | |
2690 | } while (dst->xfrm); | |
2691 | ||
2692 | if (likely(!last)) | |
2693 | return 1; | |
2694 | ||
2695 | mtu = last->child_mtu_cached; | |
2696 | for (;;) { | |
2697 | dst = &last->u.dst; | |
2698 | ||
2699 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2700 | if (mtu > last->route_mtu_cached) | |
2701 | mtu = last->route_mtu_cached; | |
defb3519 | 2702 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
2703 | |
2704 | if (last == first) | |
2705 | break; | |
2706 | ||
bd0bf076 | 2707 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2708 | last->child_mtu_cached = mtu; |
2709 | } | |
2710 | ||
2711 | return 1; | |
2712 | } | |
2713 | ||
0dbaee3b DM |
2714 | static unsigned int xfrm_default_advmss(const struct dst_entry *dst) |
2715 | { | |
2716 | return dst_metric_advmss(dst->path); | |
2717 | } | |
2718 | ||
ebb762f2 | 2719 | static unsigned int xfrm_mtu(const struct dst_entry *dst) |
d33e4553 | 2720 | { |
618f9bc7 SK |
2721 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2722 | ||
2723 | return mtu ? : dst_mtu(dst->path); | |
d33e4553 DM |
2724 | } |
2725 | ||
1ecc9ad0 JA |
2726 | static const void *xfrm_get_dst_nexthop(const struct dst_entry *dst, |
2727 | const void *daddr) | |
63fca65d JA |
2728 | { |
2729 | const struct dst_entry *path = dst->path; | |
2730 | ||
2731 | for (; dst != path; dst = dst->child) { | |
2732 | const struct xfrm_state *xfrm = dst->xfrm; | |
2733 | ||
2734 | if (xfrm->props.mode == XFRM_MODE_TRANSPORT) | |
2735 | continue; | |
2736 | if (xfrm->type->flags & XFRM_TYPE_REMOTE_COADDR) | |
2737 | daddr = xfrm->coaddr; | |
2738 | else if (!(xfrm->type->flags & XFRM_TYPE_LOCAL_COADDR)) | |
2739 | daddr = &xfrm->id.daddr; | |
2740 | } | |
1ecc9ad0 JA |
2741 | return daddr; |
2742 | } | |
2743 | ||
2744 | static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, | |
2745 | struct sk_buff *skb, | |
2746 | const void *daddr) | |
2747 | { | |
2748 | const struct dst_entry *path = dst->path; | |
2749 | ||
2750 | if (!skb) | |
2751 | daddr = xfrm_get_dst_nexthop(dst, daddr); | |
2752 | return path->ops->neigh_lookup(path, skb, daddr); | |
2753 | } | |
2754 | ||
2755 | static void xfrm_confirm_neigh(const struct dst_entry *dst, const void *daddr) | |
2756 | { | |
2757 | const struct dst_entry *path = dst->path; | |
2758 | ||
2759 | daddr = xfrm_get_dst_nexthop(dst, daddr); | |
63fca65d JA |
2760 | path->ops->confirm_neigh(path, daddr); |
2761 | } | |
2762 | ||
a2817d8b | 2763 | int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family) |
1da177e4 LT |
2764 | { |
2765 | int err = 0; | |
a2817d8b FW |
2766 | |
2767 | if (WARN_ON(family >= ARRAY_SIZE(xfrm_policy_afinfo))) | |
1da177e4 | 2768 | return -EAFNOSUPPORT; |
a2817d8b | 2769 | |
ef8531b6 | 2770 | spin_lock(&xfrm_policy_afinfo_lock); |
a2817d8b | 2771 | if (unlikely(xfrm_policy_afinfo[family] != NULL)) |
f31e8d4f | 2772 | err = -EEXIST; |
1da177e4 LT |
2773 | else { |
2774 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2775 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2776 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2777 | if (likely(dst_ops->check == NULL)) | |
2778 | dst_ops->check = xfrm_dst_check; | |
0dbaee3b DM |
2779 | if (likely(dst_ops->default_advmss == NULL)) |
2780 | dst_ops->default_advmss = xfrm_default_advmss; | |
ebb762f2 SK |
2781 | if (likely(dst_ops->mtu == NULL)) |
2782 | dst_ops->mtu = xfrm_mtu; | |
1da177e4 LT |
2783 | if (likely(dst_ops->negative_advice == NULL)) |
2784 | dst_ops->negative_advice = xfrm_negative_advice; | |
2785 | if (likely(dst_ops->link_failure == NULL)) | |
2786 | dst_ops->link_failure = xfrm_link_failure; | |
d3aaeb38 DM |
2787 | if (likely(dst_ops->neigh_lookup == NULL)) |
2788 | dst_ops->neigh_lookup = xfrm_neigh_lookup; | |
63fca65d JA |
2789 | if (likely(!dst_ops->confirm_neigh)) |
2790 | dst_ops->confirm_neigh = xfrm_confirm_neigh; | |
a2817d8b | 2791 | rcu_assign_pointer(xfrm_policy_afinfo[family], afinfo); |
1da177e4 | 2792 | } |
ef8531b6 | 2793 | spin_unlock(&xfrm_policy_afinfo_lock); |
d7c7544c | 2794 | |
1da177e4 LT |
2795 | return err; |
2796 | } | |
2797 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2798 | ||
a2817d8b | 2799 | void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo) |
1da177e4 | 2800 | { |
2b61997a | 2801 | struct dst_ops *dst_ops = afinfo->dst_ops; |
a2817d8b | 2802 | int i; |
2b61997a | 2803 | |
a2817d8b FW |
2804 | for (i = 0; i < ARRAY_SIZE(xfrm_policy_afinfo); i++) { |
2805 | if (xfrm_policy_afinfo[i] != afinfo) | |
2806 | continue; | |
2807 | RCU_INIT_POINTER(xfrm_policy_afinfo[i], NULL); | |
2808 | break; | |
ef8531b6 | 2809 | } |
ef8531b6 | 2810 | |
2b61997a | 2811 | synchronize_rcu(); |
ef8531b6 | 2812 | |
2b61997a FW |
2813 | dst_ops->kmem_cachep = NULL; |
2814 | dst_ops->check = NULL; | |
2815 | dst_ops->negative_advice = NULL; | |
2816 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2817 | } |
2818 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2819 | ||
558f82ef | 2820 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2821 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2822 | { |
c68cd1a0 | 2823 | int rv; |
698365fa WC |
2824 | net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib); |
2825 | if (!net->mib.xfrm_statistics) | |
558f82ef | 2826 | return -ENOMEM; |
c68cd1a0 AD |
2827 | rv = xfrm_proc_init(net); |
2828 | if (rv < 0) | |
698365fa | 2829 | free_percpu(net->mib.xfrm_statistics); |
c68cd1a0 | 2830 | return rv; |
558f82ef | 2831 | } |
59c9940e AD |
2832 | |
2833 | static void xfrm_statistics_fini(struct net *net) | |
2834 | { | |
c68cd1a0 | 2835 | xfrm_proc_fini(net); |
698365fa | 2836 | free_percpu(net->mib.xfrm_statistics); |
59c9940e AD |
2837 | } |
2838 | #else | |
2839 | static int __net_init xfrm_statistics_init(struct net *net) | |
2840 | { | |
2841 | return 0; | |
2842 | } | |
2843 | ||
2844 | static void xfrm_statistics_fini(struct net *net) | |
2845 | { | |
2846 | } | |
558f82ef MN |
2847 | #endif |
2848 | ||
d62ddc21 | 2849 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2850 | { |
2518c7c2 DM |
2851 | unsigned int hmask, sz; |
2852 | int dir; | |
2853 | ||
d62ddc21 AD |
2854 | if (net_eq(net, &init_net)) |
2855 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2856 | sizeof(struct xfrm_dst), |
e5d679f3 | 2857 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2858 | NULL); |
1da177e4 | 2859 | |
2518c7c2 DM |
2860 | hmask = 8 - 1; |
2861 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2862 | ||
93b851c1 AD |
2863 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2864 | if (!net->xfrm.policy_byidx) | |
2865 | goto out_byidx; | |
8100bea7 | 2866 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 | 2867 | |
53c2e285 | 2868 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
2869 | struct xfrm_policy_hash *htab; |
2870 | ||
dc2caba7 | 2871 | net->xfrm.policy_count[dir] = 0; |
53c2e285 | 2872 | net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0; |
8b18f8ea | 2873 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2874 | |
a35f6c5d | 2875 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2876 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2877 | if (!htab->table) |
a35f6c5d AD |
2878 | goto out_bydst; |
2879 | htab->hmask = hmask; | |
b58555f1 CG |
2880 | htab->dbits4 = 32; |
2881 | htab->sbits4 = 32; | |
2882 | htab->dbits6 = 128; | |
2883 | htab->sbits6 = 128; | |
2518c7c2 | 2884 | } |
880a6fab CG |
2885 | net->xfrm.policy_hthresh.lbits4 = 32; |
2886 | net->xfrm.policy_hthresh.rbits4 = 32; | |
2887 | net->xfrm.policy_hthresh.lbits6 = 128; | |
2888 | net->xfrm.policy_hthresh.rbits6 = 128; | |
2889 | ||
2890 | seqlock_init(&net->xfrm.policy_hthresh.lock); | |
2518c7c2 | 2891 | |
adfcf0b2 | 2892 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2893 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
880a6fab | 2894 | INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild); |
d62ddc21 | 2895 | if (net_eq(net, &init_net)) |
21f42cc9 | 2896 | xfrm_dev_init(); |
d62ddc21 | 2897 | return 0; |
93b851c1 | 2898 | |
a35f6c5d AD |
2899 | out_bydst: |
2900 | for (dir--; dir >= 0; dir--) { | |
2901 | struct xfrm_policy_hash *htab; | |
2902 | ||
2903 | htab = &net->xfrm.policy_bydst[dir]; | |
2904 | xfrm_hash_free(htab->table, sz); | |
2905 | } | |
2906 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
2907 | out_byidx: |
2908 | return -ENOMEM; | |
d62ddc21 AD |
2909 | } |
2910 | ||
2911 | static void xfrm_policy_fini(struct net *net) | |
2912 | { | |
93b851c1 | 2913 | unsigned int sz; |
8b18f8ea | 2914 | int dir; |
93b851c1 | 2915 | |
7c2776ee AD |
2916 | flush_work(&net->xfrm.policy_hash_work); |
2917 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2e71029e | 2918 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false); |
7c2776ee | 2919 | #endif |
2e71029e | 2920 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false); |
7c2776ee | 2921 | |
adfcf0b2 | 2922 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2923 | |
53c2e285 | 2924 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
a35f6c5d AD |
2925 | struct xfrm_policy_hash *htab; |
2926 | ||
8b18f8ea | 2927 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
2928 | |
2929 | htab = &net->xfrm.policy_bydst[dir]; | |
5b653b2a | 2930 | sz = (htab->hmask + 1) * sizeof(struct hlist_head); |
a35f6c5d AD |
2931 | WARN_ON(!hlist_empty(htab->table)); |
2932 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
2933 | } |
2934 | ||
8100bea7 | 2935 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2936 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2937 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2938 | } |
2939 | ||
d62ddc21 AD |
2940 | static int __net_init xfrm_net_init(struct net *net) |
2941 | { | |
2942 | int rv; | |
2943 | ||
c282222a FW |
2944 | /* Initialize the per-net locks here */ |
2945 | spin_lock_init(&net->xfrm.xfrm_state_lock); | |
2946 | spin_lock_init(&net->xfrm.xfrm_policy_lock); | |
2947 | mutex_init(&net->xfrm.xfrm_cfg_mutex); | |
2948 | ||
59c9940e AD |
2949 | rv = xfrm_statistics_init(net); |
2950 | if (rv < 0) | |
2951 | goto out_statistics; | |
d62ddc21 AD |
2952 | rv = xfrm_state_init(net); |
2953 | if (rv < 0) | |
2954 | goto out_state; | |
2955 | rv = xfrm_policy_init(net); | |
2956 | if (rv < 0) | |
2957 | goto out_policy; | |
b27aeadb AD |
2958 | rv = xfrm_sysctl_init(net); |
2959 | if (rv < 0) | |
2960 | goto out_sysctl; | |
283bc9f3 | 2961 | |
d62ddc21 AD |
2962 | return 0; |
2963 | ||
b27aeadb AD |
2964 | out_sysctl: |
2965 | xfrm_policy_fini(net); | |
d62ddc21 AD |
2966 | out_policy: |
2967 | xfrm_state_fini(net); | |
2968 | out_state: | |
59c9940e AD |
2969 | xfrm_statistics_fini(net); |
2970 | out_statistics: | |
d62ddc21 AD |
2971 | return rv; |
2972 | } | |
2973 | ||
2974 | static void __net_exit xfrm_net_exit(struct net *net) | |
2975 | { | |
b27aeadb | 2976 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
2977 | xfrm_policy_fini(net); |
2978 | xfrm_state_fini(net); | |
59c9940e | 2979 | xfrm_statistics_fini(net); |
d62ddc21 AD |
2980 | } |
2981 | ||
2982 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2983 | .init = xfrm_net_init, | |
2984 | .exit = xfrm_net_exit, | |
2985 | }; | |
2986 | ||
1da177e4 LT |
2987 | void __init xfrm_init(void) |
2988 | { | |
ec30d78c FW |
2989 | int i; |
2990 | ||
2991 | xfrm_pcpu_work = kmalloc_array(NR_CPUS, sizeof(*xfrm_pcpu_work), | |
2992 | GFP_KERNEL); | |
2993 | BUG_ON(!xfrm_pcpu_work); | |
2994 | ||
2995 | for (i = 0; i < NR_CPUS; i++) | |
2996 | INIT_WORK(&xfrm_pcpu_work[i], xfrm_pcpu_work_fn); | |
2997 | ||
d62ddc21 | 2998 | register_pernet_subsys(&xfrm_net_ops); |
30846090 | 2999 | seqcount_init(&xfrm_policy_hash_generation); |
1da177e4 LT |
3000 | xfrm_input_init(); |
3001 | } | |
3002 | ||
ab5f5e8b | 3003 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
3004 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
3005 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 3006 | { |
875179fa PM |
3007 | struct xfrm_sec_ctx *ctx = xp->security; |
3008 | struct xfrm_selector *sel = &xp->selector; | |
3009 | ||
3010 | if (ctx) | |
ab5f5e8b | 3011 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 3012 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 3013 | |
9b7a787d | 3014 | switch (sel->family) { |
ab5f5e8b | 3015 | case AF_INET: |
21454aaa | 3016 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
3017 | if (sel->prefixlen_s != 32) |
3018 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
3019 | sel->prefixlen_s); | |
21454aaa | 3020 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
3021 | if (sel->prefixlen_d != 32) |
3022 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
3023 | sel->prefixlen_d); | |
ab5f5e8b JL |
3024 | break; |
3025 | case AF_INET6: | |
5b095d98 | 3026 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
3027 | if (sel->prefixlen_s != 128) |
3028 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
3029 | sel->prefixlen_s); | |
5b095d98 | 3030 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
3031 | if (sel->prefixlen_d != 128) |
3032 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
3033 | sel->prefixlen_d); | |
ab5f5e8b JL |
3034 | break; |
3035 | } | |
3036 | } | |
3037 | ||
2e71029e | 3038 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid) |
ab5f5e8b JL |
3039 | { |
3040 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 3041 | |
afeb14b4 | 3042 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
3043 | if (audit_buf == NULL) |
3044 | return; | |
2e71029e | 3045 | xfrm_audit_helper_usrinfo(task_valid, audit_buf); |
afeb14b4 | 3046 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
3047 | xfrm_audit_common_policyinfo(xp, audit_buf); |
3048 | audit_log_end(audit_buf); | |
3049 | } | |
3050 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
3051 | ||
68277acc | 3052 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2e71029e | 3053 | bool task_valid) |
ab5f5e8b JL |
3054 | { |
3055 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 3056 | |
afeb14b4 | 3057 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
3058 | if (audit_buf == NULL) |
3059 | return; | |
2e71029e | 3060 | xfrm_audit_helper_usrinfo(task_valid, audit_buf); |
afeb14b4 | 3061 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
3062 | xfrm_audit_common_policyinfo(xp, audit_buf); |
3063 | audit_log_end(audit_buf); | |
3064 | } | |
3065 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
3066 | #endif | |
3067 | ||
80c9abaa | 3068 | #ifdef CONFIG_XFRM_MIGRATE |
bc9b35ad DM |
3069 | static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp, |
3070 | const struct xfrm_selector *sel_tgt) | |
80c9abaa SS |
3071 | { |
3072 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
3073 | if (sel_tgt->family == sel_cmp->family && | |
70e94e66 YH |
3074 | xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr, |
3075 | sel_cmp->family) && | |
3076 | xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr, | |
3077 | sel_cmp->family) && | |
80c9abaa SS |
3078 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && |
3079 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
bc9b35ad | 3080 | return true; |
80c9abaa SS |
3081 | } |
3082 | } else { | |
3083 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
bc9b35ad | 3084 | return true; |
80c9abaa SS |
3085 | } |
3086 | } | |
bc9b35ad | 3087 | return false; |
80c9abaa SS |
3088 | } |
3089 | ||
3e94c2dc WC |
3090 | static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel, |
3091 | u8 dir, u8 type, struct net *net) | |
80c9abaa SS |
3092 | { |
3093 | struct xfrm_policy *pol, *ret = NULL; | |
80c9abaa SS |
3094 | struct hlist_head *chain; |
3095 | u32 priority = ~0U; | |
3096 | ||
9d0380df | 3097 | spin_lock_bh(&net->xfrm.xfrm_policy_lock); |
8d549c4f | 3098 | chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir); |
b67bfe0d | 3099 | hlist_for_each_entry(pol, chain, bydst) { |
80c9abaa SS |
3100 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
3101 | pol->type == type) { | |
3102 | ret = pol; | |
3103 | priority = ret->priority; | |
3104 | break; | |
3105 | } | |
3106 | } | |
8d549c4f | 3107 | chain = &net->xfrm.policy_inexact[dir]; |
b67bfe0d | 3108 | hlist_for_each_entry(pol, chain, bydst) { |
8faf491e LR |
3109 | if ((pol->priority >= priority) && ret) |
3110 | break; | |
3111 | ||
80c9abaa | 3112 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
8faf491e | 3113 | pol->type == type) { |
80c9abaa SS |
3114 | ret = pol; |
3115 | break; | |
3116 | } | |
3117 | } | |
3118 | ||
586f2eb4 | 3119 | xfrm_pol_hold(ret); |
80c9abaa | 3120 | |
9d0380df | 3121 | spin_unlock_bh(&net->xfrm.xfrm_policy_lock); |
80c9abaa SS |
3122 | |
3123 | return ret; | |
3124 | } | |
3125 | ||
dd701754 | 3126 | static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t) |
80c9abaa SS |
3127 | { |
3128 | int match = 0; | |
3129 | ||
3130 | if (t->mode == m->mode && t->id.proto == m->proto && | |
3131 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
3132 | switch (t->mode) { | |
3133 | case XFRM_MODE_TUNNEL: | |
3134 | case XFRM_MODE_BEET: | |
70e94e66 YH |
3135 | if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr, |
3136 | m->old_family) && | |
3137 | xfrm_addr_equal(&t->saddr, &m->old_saddr, | |
3138 | m->old_family)) { | |
80c9abaa SS |
3139 | match = 1; |
3140 | } | |
3141 | break; | |
3142 | case XFRM_MODE_TRANSPORT: | |
3143 | /* in case of transport mode, template does not store | |
3144 | any IP addresses, hence we just compare mode and | |
3145 | protocol */ | |
3146 | match = 1; | |
3147 | break; | |
3148 | default: | |
3149 | break; | |
3150 | } | |
3151 | } | |
3152 | return match; | |
3153 | } | |
3154 | ||
3155 | /* update endpoint address(es) of template(s) */ | |
3156 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
3157 | struct xfrm_migrate *m, int num_migrate) | |
3158 | { | |
3159 | struct xfrm_migrate *mp; | |
80c9abaa SS |
3160 | int i, j, n = 0; |
3161 | ||
3162 | write_lock_bh(&pol->lock); | |
12a169e7 | 3163 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
3164 | /* target policy has been deleted */ |
3165 | write_unlock_bh(&pol->lock); | |
3166 | return -ENOENT; | |
3167 | } | |
3168 | ||
3169 | for (i = 0; i < pol->xfrm_nr; i++) { | |
3170 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
3171 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
3172 | continue; | |
3173 | n++; | |
1bfcb10f HX |
3174 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
3175 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
3176 | continue; |
3177 | /* update endpoints */ | |
3178 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
3179 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
3180 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
3181 | sizeof(pol->xfrm_vec[i].saddr)); | |
3182 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
3183 | /* flush bundles */ | |
80c802f3 | 3184 | atomic_inc(&pol->genid); |
80c9abaa SS |
3185 | } |
3186 | } | |
3187 | ||
3188 | write_unlock_bh(&pol->lock); | |
3189 | ||
3190 | if (!n) | |
3191 | return -ENODATA; | |
3192 | ||
3193 | return 0; | |
3194 | } | |
3195 | ||
dd701754 | 3196 | static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate) |
80c9abaa SS |
3197 | { |
3198 | int i, j; | |
3199 | ||
3200 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
3201 | return -EINVAL; | |
3202 | ||
3203 | for (i = 0; i < num_migrate; i++) { | |
80c9abaa SS |
3204 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || |
3205 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
3206 | return -EINVAL; | |
3207 | ||
3208 | /* check if there is any duplicated entry */ | |
3209 | for (j = i + 1; j < num_migrate; j++) { | |
3210 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
3211 | sizeof(m[i].old_daddr)) && | |
3212 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
3213 | sizeof(m[i].old_saddr)) && | |
3214 | m[i].proto == m[j].proto && | |
3215 | m[i].mode == m[j].mode && | |
3216 | m[i].reqid == m[j].reqid && | |
3217 | m[i].old_family == m[j].old_family) | |
3218 | return -EINVAL; | |
3219 | } | |
3220 | } | |
3221 | ||
3222 | return 0; | |
3223 | } | |
3224 | ||
b4b7c0b3 | 3225 | int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 | 3226 | struct xfrm_migrate *m, int num_migrate, |
4ab47d47 AA |
3227 | struct xfrm_kmaddress *k, struct net *net, |
3228 | struct xfrm_encap_tmpl *encap) | |
80c9abaa SS |
3229 | { |
3230 | int i, err, nx_cur = 0, nx_new = 0; | |
3231 | struct xfrm_policy *pol = NULL; | |
3232 | struct xfrm_state *x, *xc; | |
3233 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
3234 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
3235 | struct xfrm_migrate *mp; | |
3236 | ||
7bab0963 | 3237 | /* Stage 0 - sanity checks */ |
80c9abaa SS |
3238 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) |
3239 | goto out; | |
3240 | ||
7bab0963 VD |
3241 | if (dir >= XFRM_POLICY_MAX) { |
3242 | err = -EINVAL; | |
3243 | goto out; | |
3244 | } | |
3245 | ||
80c9abaa | 3246 | /* Stage 1 - find policy */ |
8d549c4f | 3247 | if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) { |
80c9abaa SS |
3248 | err = -ENOENT; |
3249 | goto out; | |
3250 | } | |
3251 | ||
3252 | /* Stage 2 - find and update state(s) */ | |
3253 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
283bc9f3 | 3254 | if ((x = xfrm_migrate_state_find(mp, net))) { |
80c9abaa SS |
3255 | x_cur[nx_cur] = x; |
3256 | nx_cur++; | |
4ab47d47 AA |
3257 | xc = xfrm_state_migrate(x, mp, encap); |
3258 | if (xc) { | |
80c9abaa SS |
3259 | x_new[nx_new] = xc; |
3260 | nx_new++; | |
3261 | } else { | |
3262 | err = -ENODATA; | |
3263 | goto restore_state; | |
3264 | } | |
3265 | } | |
3266 | } | |
3267 | ||
3268 | /* Stage 3 - update policy */ | |
3269 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
3270 | goto restore_state; | |
3271 | ||
3272 | /* Stage 4 - delete old state(s) */ | |
3273 | if (nx_cur) { | |
3274 | xfrm_states_put(x_cur, nx_cur); | |
3275 | xfrm_states_delete(x_cur, nx_cur); | |
3276 | } | |
3277 | ||
3278 | /* Stage 5 - announce */ | |
8bafd730 | 3279 | km_migrate(sel, dir, type, m, num_migrate, k, encap); |
80c9abaa SS |
3280 | |
3281 | xfrm_pol_put(pol); | |
3282 | ||
3283 | return 0; | |
3284 | out: | |
3285 | return err; | |
3286 | ||
3287 | restore_state: | |
3288 | if (pol) | |
3289 | xfrm_pol_put(pol); | |
3290 | if (nx_cur) | |
3291 | xfrm_states_put(x_cur, nx_cur); | |
3292 | if (nx_new) | |
3293 | xfrm_states_delete(x_new, nx_new); | |
3294 | ||
3295 | return err; | |
3296 | } | |
e610e679 | 3297 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 3298 | #endif |