Commit | Line | Data |
---|---|---|
a716c119 | 1 | /* |
1da177e4 LT |
2 | * xfrm_policy.c |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * Kazunori MIYAZAWA @USAGI | |
10 | * YOSHIFUJI Hideaki | |
11 | * Split up af-specific portion | |
12 | * Derek Atkins <derek@ihtfp.com> Add the post_input processor | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
66cdb3ca | 16 | #include <linux/err.h> |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/kmod.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/workqueue.h> | |
22 | #include <linux/notifier.h> | |
23 | #include <linux/netdevice.h> | |
eb9c7ebe | 24 | #include <linux/netfilter.h> |
1da177e4 | 25 | #include <linux/module.h> |
2518c7c2 | 26 | #include <linux/cache.h> |
68277acc | 27 | #include <linux/audit.h> |
25ee3286 | 28 | #include <net/dst.h> |
6ce74ec7 | 29 | #include <net/flow.h> |
1da177e4 LT |
30 | #include <net/xfrm.h> |
31 | #include <net/ip.h> | |
558f82ef MN |
32 | #ifdef CONFIG_XFRM_STATISTICS |
33 | #include <net/snmp.h> | |
34 | #endif | |
1da177e4 | 35 | |
44e36b42 DM |
36 | #include "xfrm_hash.h" |
37 | ||
a0073fe1 SK |
38 | #define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10)) |
39 | #define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ)) | |
40 | #define XFRM_MAX_QUEUE_LEN 100 | |
41 | ||
80c802f3 | 42 | static struct dst_entry *xfrm_policy_sk_bundles; |
1da177e4 | 43 | |
418a99ac PJ |
44 | static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock); |
45 | static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO] | |
46 | __read_mostly; | |
1da177e4 | 47 | |
e18b890b | 48 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 | 49 | |
25ee3286 | 50 | static void xfrm_init_pmtu(struct dst_entry *dst); |
80c802f3 | 51 | static int stale_bundle(struct dst_entry *dst); |
12fdb4d3 | 52 | static int xfrm_bundle_ok(struct xfrm_dst *xdst); |
a0073fe1 | 53 | static void xfrm_policy_queue_process(unsigned long arg); |
1da177e4 | 54 | |
29fa0b30 WY |
55 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
56 | int dir); | |
57 | ||
bc9b35ad | 58 | static inline bool |
200ce96e | 59 | __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 60 | { |
7e1dc7b6 DM |
61 | const struct flowi4 *fl4 = &fl->u.ip4; |
62 | ||
26bff940 AD |
63 | return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) && |
64 | addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) && | |
7e1dc7b6 DM |
65 | !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) && |
66 | !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) && | |
67 | (fl4->flowi4_proto == sel->proto || !sel->proto) && | |
68 | (fl4->flowi4_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
69 | } |
70 | ||
bc9b35ad | 71 | static inline bool |
200ce96e | 72 | __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 73 | { |
7e1dc7b6 DM |
74 | const struct flowi6 *fl6 = &fl->u.ip6; |
75 | ||
76 | return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) && | |
77 | addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) && | |
78 | !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) && | |
79 | !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) && | |
80 | (fl6->flowi6_proto == sel->proto || !sel->proto) && | |
81 | (fl6->flowi6_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
82 | } |
83 | ||
bc9b35ad DM |
84 | bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl, |
85 | unsigned short family) | |
77681021 AM |
86 | { |
87 | switch (family) { | |
88 | case AF_INET: | |
89 | return __xfrm4_selector_match(sel, fl); | |
90 | case AF_INET6: | |
91 | return __xfrm6_selector_match(sel, fl); | |
92 | } | |
bc9b35ad | 93 | return false; |
77681021 AM |
94 | } |
95 | ||
ef8531b6 ED |
96 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
97 | { | |
98 | struct xfrm_policy_afinfo *afinfo; | |
99 | ||
100 | if (unlikely(family >= NPROTO)) | |
101 | return NULL; | |
102 | rcu_read_lock(); | |
103 | afinfo = rcu_dereference(xfrm_policy_afinfo[family]); | |
104 | if (unlikely(!afinfo)) | |
105 | rcu_read_unlock(); | |
106 | return afinfo; | |
107 | } | |
108 | ||
109 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
110 | { | |
111 | rcu_read_unlock(); | |
112 | } | |
113 | ||
c5b3cf46 | 114 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, |
6418c4e0 DM |
115 | const xfrm_address_t *saddr, |
116 | const xfrm_address_t *daddr, | |
9bb182a7 YH |
117 | int family) |
118 | { | |
119 | struct xfrm_policy_afinfo *afinfo; | |
120 | struct dst_entry *dst; | |
121 | ||
122 | afinfo = xfrm_policy_get_afinfo(family); | |
123 | if (unlikely(afinfo == NULL)) | |
124 | return ERR_PTR(-EAFNOSUPPORT); | |
125 | ||
c5b3cf46 | 126 | dst = afinfo->dst_lookup(net, tos, saddr, daddr); |
9bb182a7 YH |
127 | |
128 | xfrm_policy_put_afinfo(afinfo); | |
129 | ||
130 | return dst; | |
131 | } | |
132 | ||
25ee3286 | 133 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
9bb182a7 YH |
134 | xfrm_address_t *prev_saddr, |
135 | xfrm_address_t *prev_daddr, | |
25ee3286 | 136 | int family) |
1da177e4 | 137 | { |
c5b3cf46 | 138 | struct net *net = xs_net(x); |
66cdb3ca HX |
139 | xfrm_address_t *saddr = &x->props.saddr; |
140 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
141 | struct dst_entry *dst; |
142 | ||
9bb182a7 | 143 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 144 | saddr = x->coaddr; |
9bb182a7 YH |
145 | daddr = prev_daddr; |
146 | } | |
147 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
148 | saddr = prev_saddr; | |
66cdb3ca | 149 | daddr = x->coaddr; |
9bb182a7 | 150 | } |
1da177e4 | 151 | |
c5b3cf46 | 152 | dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family); |
9bb182a7 YH |
153 | |
154 | if (!IS_ERR(dst)) { | |
155 | if (prev_saddr != saddr) | |
156 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
157 | if (prev_daddr != daddr) | |
158 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
159 | } | |
1da177e4 | 160 | |
66cdb3ca | 161 | return dst; |
1da177e4 | 162 | } |
1da177e4 | 163 | |
1da177e4 LT |
164 | static inline unsigned long make_jiffies(long secs) |
165 | { | |
166 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
167 | return MAX_SCHEDULE_TIMEOUT-1; | |
168 | else | |
a716c119 | 169 | return secs*HZ; |
1da177e4 LT |
170 | } |
171 | ||
172 | static void xfrm_policy_timer(unsigned long data) | |
173 | { | |
174 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 175 | unsigned long now = get_seconds(); |
1da177e4 LT |
176 | long next = LONG_MAX; |
177 | int warn = 0; | |
178 | int dir; | |
179 | ||
180 | read_lock(&xp->lock); | |
181 | ||
ea2dea9d | 182 | if (unlikely(xp->walk.dead)) |
1da177e4 LT |
183 | goto out; |
184 | ||
77d8d7a6 | 185 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
186 | |
187 | if (xp->lft.hard_add_expires_seconds) { | |
188 | long tmo = xp->lft.hard_add_expires_seconds + | |
189 | xp->curlft.add_time - now; | |
190 | if (tmo <= 0) | |
191 | goto expired; | |
192 | if (tmo < next) | |
193 | next = tmo; | |
194 | } | |
195 | if (xp->lft.hard_use_expires_seconds) { | |
196 | long tmo = xp->lft.hard_use_expires_seconds + | |
197 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
198 | if (tmo <= 0) | |
199 | goto expired; | |
200 | if (tmo < next) | |
201 | next = tmo; | |
202 | } | |
203 | if (xp->lft.soft_add_expires_seconds) { | |
204 | long tmo = xp->lft.soft_add_expires_seconds + | |
205 | xp->curlft.add_time - now; | |
206 | if (tmo <= 0) { | |
207 | warn = 1; | |
208 | tmo = XFRM_KM_TIMEOUT; | |
209 | } | |
210 | if (tmo < next) | |
211 | next = tmo; | |
212 | } | |
213 | if (xp->lft.soft_use_expires_seconds) { | |
214 | long tmo = xp->lft.soft_use_expires_seconds + | |
215 | (xp->curlft.use_time ? : 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 | ||
224 | if (warn) | |
6c5c8ca7 | 225 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
226 | if (next != LONG_MAX && |
227 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
228 | xfrm_pol_hold(xp); | |
229 | ||
230 | out: | |
231 | read_unlock(&xp->lock); | |
232 | xfrm_pol_put(xp); | |
233 | return; | |
234 | ||
235 | expired: | |
236 | read_unlock(&xp->lock); | |
4666faab | 237 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 238 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
239 | xfrm_pol_put(xp); |
240 | } | |
241 | ||
fe1a5f03 TT |
242 | static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo) |
243 | { | |
244 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
245 | ||
246 | if (unlikely(pol->walk.dead)) | |
247 | flo = NULL; | |
248 | else | |
249 | xfrm_pol_hold(pol); | |
250 | ||
251 | return flo; | |
252 | } | |
253 | ||
254 | static int xfrm_policy_flo_check(struct flow_cache_object *flo) | |
255 | { | |
256 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
257 | ||
258 | return !pol->walk.dead; | |
259 | } | |
260 | ||
261 | static void xfrm_policy_flo_delete(struct flow_cache_object *flo) | |
262 | { | |
263 | xfrm_pol_put(container_of(flo, struct xfrm_policy, flo)); | |
264 | } | |
265 | ||
266 | static const struct flow_cache_ops xfrm_policy_fc_ops = { | |
267 | .get = xfrm_policy_flo_get, | |
268 | .check = xfrm_policy_flo_check, | |
269 | .delete = xfrm_policy_flo_delete, | |
270 | }; | |
1da177e4 LT |
271 | |
272 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
273 | * SPD calls. | |
274 | */ | |
275 | ||
0331b1f3 | 276 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
277 | { |
278 | struct xfrm_policy *policy; | |
279 | ||
0da974f4 | 280 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
281 | |
282 | if (policy) { | |
0331b1f3 | 283 | write_pnet(&policy->xp_net, net); |
12a169e7 | 284 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
285 | INIT_HLIST_NODE(&policy->bydst); |
286 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 287 | rwlock_init(&policy->lock); |
2518c7c2 | 288 | atomic_set(&policy->refcnt, 1); |
a0073fe1 | 289 | skb_queue_head_init(&policy->polq.hold_queue); |
b24b8a24 PE |
290 | setup_timer(&policy->timer, xfrm_policy_timer, |
291 | (unsigned long)policy); | |
a0073fe1 SK |
292 | setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process, |
293 | (unsigned long)policy); | |
fe1a5f03 | 294 | policy->flo.ops = &xfrm_policy_fc_ops; |
1da177e4 LT |
295 | } |
296 | return policy; | |
297 | } | |
298 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
299 | ||
300 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
301 | ||
64c31b3f | 302 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 303 | { |
12a169e7 | 304 | BUG_ON(!policy->walk.dead); |
1da177e4 | 305 | |
0659eea9 | 306 | if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer)) |
1da177e4 LT |
307 | BUG(); |
308 | ||
03e1ad7b | 309 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
310 | kfree(policy); |
311 | } | |
64c31b3f | 312 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 | 313 | |
a0073fe1 SK |
314 | static void xfrm_queue_purge(struct sk_buff_head *list) |
315 | { | |
316 | struct sk_buff *skb; | |
317 | ||
302a50bc | 318 | while ((skb = skb_dequeue(list)) != NULL) |
a0073fe1 | 319 | kfree_skb(skb); |
a0073fe1 SK |
320 | } |
321 | ||
1da177e4 LT |
322 | /* Rule must be locked. Release descentant resources, announce |
323 | * entry dead. The rule must be unlinked from lists to the moment. | |
324 | */ | |
325 | ||
326 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
327 | { | |
12a169e7 | 328 | policy->walk.dead = 1; |
1da177e4 | 329 | |
285ead17 | 330 | atomic_inc(&policy->genid); |
1da177e4 | 331 | |
e7d8f6cb SK |
332 | if (del_timer(&policy->polq.hold_timer)) |
333 | xfrm_pol_put(policy); | |
a0073fe1 SK |
334 | xfrm_queue_purge(&policy->polq.hold_queue); |
335 | ||
285ead17 TT |
336 | if (del_timer(&policy->timer)) |
337 | xfrm_pol_put(policy); | |
338 | ||
339 | xfrm_pol_put(policy); | |
1da177e4 LT |
340 | } |
341 | ||
2518c7c2 DM |
342 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
343 | ||
e92303f8 | 344 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 345 | { |
e92303f8 | 346 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
347 | } |
348 | ||
5f803b58 DM |
349 | static struct hlist_head *policy_hash_bysel(struct net *net, |
350 | const struct xfrm_selector *sel, | |
351 | unsigned short family, int dir) | |
2518c7c2 | 352 | { |
1121994c | 353 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
354 | unsigned int hash = __sel_hash(sel, family, hmask); |
355 | ||
356 | return (hash == hmask + 1 ? | |
1121994c AD |
357 | &net->xfrm.policy_inexact[dir] : |
358 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
359 | } |
360 | ||
5f803b58 DM |
361 | static struct hlist_head *policy_hash_direct(struct net *net, |
362 | const xfrm_address_t *daddr, | |
363 | const xfrm_address_t *saddr, | |
364 | unsigned short family, int dir) | |
2518c7c2 | 365 | { |
1121994c | 366 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
367 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
368 | ||
1121994c | 369 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
370 | } |
371 | ||
2518c7c2 DM |
372 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
373 | struct hlist_head *ndsttable, | |
374 | unsigned int nhashmask) | |
375 | { | |
b67bfe0d | 376 | struct hlist_node *tmp, *entry0 = NULL; |
2518c7c2 | 377 | struct xfrm_policy *pol; |
b791160b | 378 | unsigned int h0 = 0; |
2518c7c2 | 379 | |
b791160b | 380 | redo: |
b67bfe0d | 381 | hlist_for_each_entry_safe(pol, tmp, list, bydst) { |
2518c7c2 DM |
382 | unsigned int h; |
383 | ||
384 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
385 | pol->family, nhashmask); | |
b791160b | 386 | if (!entry0) { |
b67bfe0d | 387 | hlist_del(&pol->bydst); |
b791160b YH |
388 | hlist_add_head(&pol->bydst, ndsttable+h); |
389 | h0 = h; | |
390 | } else { | |
391 | if (h != h0) | |
392 | continue; | |
b67bfe0d | 393 | hlist_del(&pol->bydst); |
b791160b YH |
394 | hlist_add_after(entry0, &pol->bydst); |
395 | } | |
b67bfe0d | 396 | entry0 = &pol->bydst; |
b791160b YH |
397 | } |
398 | if (!hlist_empty(list)) { | |
399 | entry0 = NULL; | |
400 | goto redo; | |
2518c7c2 DM |
401 | } |
402 | } | |
403 | ||
404 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
405 | struct hlist_head *nidxtable, | |
406 | unsigned int nhashmask) | |
407 | { | |
b67bfe0d | 408 | struct hlist_node *tmp; |
2518c7c2 DM |
409 | struct xfrm_policy *pol; |
410 | ||
b67bfe0d | 411 | hlist_for_each_entry_safe(pol, tmp, list, byidx) { |
2518c7c2 DM |
412 | unsigned int h; |
413 | ||
414 | h = __idx_hash(pol->index, nhashmask); | |
415 | hlist_add_head(&pol->byidx, nidxtable+h); | |
416 | } | |
417 | } | |
418 | ||
419 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
420 | { | |
421 | return ((old_hmask + 1) << 1) - 1; | |
422 | } | |
423 | ||
66caf628 | 424 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 425 | { |
66caf628 | 426 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
427 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
428 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 429 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 430 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
431 | int i; |
432 | ||
433 | if (!ndst) | |
434 | return; | |
435 | ||
283bc9f3 | 436 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
437 | |
438 | for (i = hmask; i >= 0; i--) | |
439 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
440 | ||
66caf628 AD |
441 | net->xfrm.policy_bydst[dir].table = ndst; |
442 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 | 443 | |
283bc9f3 | 444 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 | 445 | |
44e36b42 | 446 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
447 | } |
448 | ||
66caf628 | 449 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 450 | { |
66caf628 | 451 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
452 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
453 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 454 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 455 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
456 | int i; |
457 | ||
458 | if (!nidx) | |
459 | return; | |
460 | ||
283bc9f3 | 461 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
462 | |
463 | for (i = hmask; i >= 0; i--) | |
464 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
465 | ||
66caf628 AD |
466 | net->xfrm.policy_byidx = nidx; |
467 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 | 468 | |
283bc9f3 | 469 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 | 470 | |
44e36b42 | 471 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
472 | } |
473 | ||
66caf628 | 474 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 475 | { |
66caf628 AD |
476 | unsigned int cnt = net->xfrm.policy_count[dir]; |
477 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
478 | |
479 | if (total) | |
480 | *total += cnt; | |
481 | ||
482 | if ((hmask + 1) < xfrm_policy_hashmax && | |
483 | cnt > hmask) | |
484 | return 1; | |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
66caf628 | 489 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 490 | { |
66caf628 | 491 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
492 | |
493 | if ((hmask + 1) < xfrm_policy_hashmax && | |
494 | total > hmask) | |
495 | return 1; | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
e071041b | 500 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 | 501 | { |
283bc9f3 | 502 | read_lock_bh(&net->xfrm.xfrm_policy_lock); |
e071041b AD |
503 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
504 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
505 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
506 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
507 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
508 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
509 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 | 510 | si->spdhmcnt = xfrm_policy_hashmax; |
283bc9f3 | 511 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ecfd6b18 JHS |
512 | } |
513 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 514 | |
ecfd6b18 | 515 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 516 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 517 | { |
66caf628 | 518 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
519 | int dir, total; |
520 | ||
521 | mutex_lock(&hash_resize_mutex); | |
522 | ||
523 | total = 0; | |
524 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
66caf628 AD |
525 | if (xfrm_bydst_should_resize(net, dir, &total)) |
526 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 527 | } |
66caf628 AD |
528 | if (xfrm_byidx_should_resize(net, total)) |
529 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
530 | |
531 | mutex_unlock(&hash_resize_mutex); | |
532 | } | |
533 | ||
1da177e4 LT |
534 | /* Generate new index... KAME seems to generate them ordered by cost |
535 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
e682adf0 | 536 | static u32 xfrm_gen_index(struct net *net, int dir, u32 index) |
1da177e4 | 537 | { |
1da177e4 LT |
538 | static u32 idx_generator; |
539 | ||
540 | for (;;) { | |
2518c7c2 DM |
541 | struct hlist_head *list; |
542 | struct xfrm_policy *p; | |
543 | u32 idx; | |
544 | int found; | |
545 | ||
e682adf0 FD |
546 | if (!index) { |
547 | idx = (idx_generator | dir); | |
548 | idx_generator += 8; | |
549 | } else { | |
550 | idx = index; | |
551 | index = 0; | |
552 | } | |
553 | ||
1da177e4 LT |
554 | if (idx == 0) |
555 | idx = 8; | |
1121994c | 556 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 | 557 | found = 0; |
b67bfe0d | 558 | hlist_for_each_entry(p, list, byidx) { |
2518c7c2 DM |
559 | if (p->index == idx) { |
560 | found = 1; | |
1da177e4 | 561 | break; |
2518c7c2 | 562 | } |
1da177e4 | 563 | } |
2518c7c2 | 564 | if (!found) |
1da177e4 LT |
565 | return idx; |
566 | } | |
567 | } | |
568 | ||
2518c7c2 DM |
569 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
570 | { | |
571 | u32 *p1 = (u32 *) s1; | |
572 | u32 *p2 = (u32 *) s2; | |
573 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
574 | int i; | |
575 | ||
576 | for (i = 0; i < len; i++) { | |
577 | if (p1[i] != p2[i]) | |
578 | return 1; | |
579 | } | |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
a0073fe1 SK |
584 | static void xfrm_policy_requeue(struct xfrm_policy *old, |
585 | struct xfrm_policy *new) | |
586 | { | |
587 | struct xfrm_policy_queue *pq = &old->polq; | |
588 | struct sk_buff_head list; | |
589 | ||
590 | __skb_queue_head_init(&list); | |
591 | ||
592 | spin_lock_bh(&pq->hold_queue.lock); | |
593 | skb_queue_splice_init(&pq->hold_queue, &list); | |
e7d8f6cb SK |
594 | if (del_timer(&pq->hold_timer)) |
595 | xfrm_pol_put(old); | |
a0073fe1 SK |
596 | spin_unlock_bh(&pq->hold_queue.lock); |
597 | ||
598 | if (skb_queue_empty(&list)) | |
599 | return; | |
600 | ||
601 | pq = &new->polq; | |
602 | ||
603 | spin_lock_bh(&pq->hold_queue.lock); | |
604 | skb_queue_splice(&list, &pq->hold_queue); | |
605 | pq->timeout = XFRM_QUEUE_TMO_MIN; | |
e7d8f6cb SK |
606 | if (!mod_timer(&pq->hold_timer, jiffies)) |
607 | xfrm_pol_hold(new); | |
a0073fe1 SK |
608 | spin_unlock_bh(&pq->hold_queue.lock); |
609 | } | |
610 | ||
7cb8a939 SK |
611 | static bool xfrm_policy_mark_match(struct xfrm_policy *policy, |
612 | struct xfrm_policy *pol) | |
613 | { | |
614 | u32 mark = policy->mark.v & policy->mark.m; | |
615 | ||
616 | if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m) | |
617 | return true; | |
618 | ||
619 | if ((mark & pol->mark.m) == pol->mark.v && | |
620 | policy->priority == pol->priority) | |
621 | return true; | |
622 | ||
623 | return false; | |
624 | } | |
625 | ||
1da177e4 LT |
626 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
627 | { | |
1121994c | 628 | struct net *net = xp_net(policy); |
2518c7c2 DM |
629 | struct xfrm_policy *pol; |
630 | struct xfrm_policy *delpol; | |
631 | struct hlist_head *chain; | |
b67bfe0d | 632 | struct hlist_node *newpos; |
1da177e4 | 633 | |
283bc9f3 | 634 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
1121994c | 635 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
636 | delpol = NULL; |
637 | newpos = NULL; | |
b67bfe0d | 638 | hlist_for_each_entry(pol, chain, bydst) { |
a6c7ab55 | 639 | if (pol->type == policy->type && |
2518c7c2 | 640 | !selector_cmp(&pol->selector, &policy->selector) && |
7cb8a939 | 641 | xfrm_policy_mark_match(policy, pol) && |
a6c7ab55 HX |
642 | xfrm_sec_ctx_match(pol->security, policy->security) && |
643 | !WARN_ON(delpol)) { | |
1da177e4 | 644 | if (excl) { |
283bc9f3 | 645 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
646 | return -EEXIST; |
647 | } | |
1da177e4 LT |
648 | delpol = pol; |
649 | if (policy->priority > pol->priority) | |
650 | continue; | |
651 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 652 | newpos = &pol->bydst; |
1da177e4 LT |
653 | continue; |
654 | } | |
1da177e4 LT |
655 | if (delpol) |
656 | break; | |
1da177e4 LT |
657 | } |
658 | if (newpos) | |
2518c7c2 DM |
659 | hlist_add_after(newpos, &policy->bydst); |
660 | else | |
661 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 662 | xfrm_pol_hold(policy); |
1121994c | 663 | net->xfrm.policy_count[dir]++; |
1da177e4 | 664 | atomic_inc(&flow_cache_genid); |
ca4c3fc2 | 665 | |
666 | /* After previous checking, family can either be AF_INET or AF_INET6 */ | |
667 | if (policy->family == AF_INET) | |
668 | rt_genid_bump_ipv4(net); | |
669 | else | |
670 | rt_genid_bump_ipv6(net); | |
671 | ||
a0073fe1 SK |
672 | if (delpol) { |
673 | xfrm_policy_requeue(delpol, policy); | |
29fa0b30 | 674 | __xfrm_policy_unlink(delpol, dir); |
a0073fe1 | 675 | } |
e682adf0 | 676 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index); |
1121994c | 677 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); |
9d729f72 | 678 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
679 | policy->curlft.use_time = 0; |
680 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
681 | xfrm_pol_hold(policy); | |
1121994c | 682 | list_add(&policy->walk.all, &net->xfrm.policy_all); |
283bc9f3 | 683 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 684 | |
9b78a82c | 685 | if (delpol) |
1da177e4 | 686 | xfrm_policy_kill(delpol); |
1121994c AD |
687 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
688 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c | 689 | |
1da177e4 LT |
690 | return 0; |
691 | } | |
692 | EXPORT_SYMBOL(xfrm_policy_insert); | |
693 | ||
8ca2e93b JHS |
694 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
695 | int dir, struct xfrm_selector *sel, | |
ef41aaa0 EP |
696 | struct xfrm_sec_ctx *ctx, int delete, |
697 | int *err) | |
1da177e4 | 698 | { |
2518c7c2 DM |
699 | struct xfrm_policy *pol, *ret; |
700 | struct hlist_head *chain; | |
1da177e4 | 701 | |
ef41aaa0 | 702 | *err = 0; |
283bc9f3 | 703 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
8d1211a6 | 704 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 | 705 | ret = NULL; |
b67bfe0d | 706 | hlist_for_each_entry(pol, chain, bydst) { |
2518c7c2 | 707 | if (pol->type == type && |
34f8d884 | 708 | (mark & pol->mark.m) == pol->mark.v && |
2518c7c2 DM |
709 | !selector_cmp(sel, &pol->selector) && |
710 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 711 | xfrm_pol_hold(pol); |
2518c7c2 | 712 | if (delete) { |
03e1ad7b PM |
713 | *err = security_xfrm_policy_delete( |
714 | pol->security); | |
ef41aaa0 | 715 | if (*err) { |
283bc9f3 | 716 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ef41aaa0 EP |
717 | return pol; |
718 | } | |
29fa0b30 | 719 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
720 | } |
721 | ret = pol; | |
1da177e4 LT |
722 | break; |
723 | } | |
724 | } | |
283bc9f3 | 725 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 726 | |
fe1a5f03 | 727 | if (ret && delete) |
2518c7c2 | 728 | xfrm_policy_kill(ret); |
2518c7c2 | 729 | return ret; |
1da177e4 | 730 | } |
df71837d | 731 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 732 | |
8ca2e93b JHS |
733 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
734 | int dir, u32 id, int delete, int *err) | |
1da177e4 | 735 | { |
2518c7c2 DM |
736 | struct xfrm_policy *pol, *ret; |
737 | struct hlist_head *chain; | |
1da177e4 | 738 | |
b5505c6e HX |
739 | *err = -ENOENT; |
740 | if (xfrm_policy_id2dir(id) != dir) | |
741 | return NULL; | |
742 | ||
ef41aaa0 | 743 | *err = 0; |
283bc9f3 | 744 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
8d1211a6 | 745 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 | 746 | ret = NULL; |
b67bfe0d | 747 | hlist_for_each_entry(pol, chain, byidx) { |
34f8d884 JHS |
748 | if (pol->type == type && pol->index == id && |
749 | (mark & pol->mark.m) == pol->mark.v) { | |
1da177e4 | 750 | xfrm_pol_hold(pol); |
2518c7c2 | 751 | if (delete) { |
03e1ad7b PM |
752 | *err = security_xfrm_policy_delete( |
753 | pol->security); | |
ef41aaa0 | 754 | if (*err) { |
283bc9f3 | 755 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ef41aaa0 EP |
756 | return pol; |
757 | } | |
29fa0b30 | 758 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
759 | } |
760 | ret = pol; | |
1da177e4 LT |
761 | break; |
762 | } | |
763 | } | |
283bc9f3 | 764 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 765 | |
fe1a5f03 | 766 | if (ret && delete) |
2518c7c2 | 767 | xfrm_policy_kill(ret); |
2518c7c2 | 768 | return ret; |
1da177e4 LT |
769 | } |
770 | EXPORT_SYMBOL(xfrm_policy_byid); | |
771 | ||
4aa2e62c JL |
772 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
773 | static inline int | |
33ffbbd5 | 774 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 775 | { |
4aa2e62c JL |
776 | int dir, err = 0; |
777 | ||
778 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
779 | struct xfrm_policy *pol; | |
4aa2e62c JL |
780 | int i; |
781 | ||
b67bfe0d | 782 | hlist_for_each_entry(pol, |
33ffbbd5 | 783 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
784 | if (pol->type != type) |
785 | continue; | |
03e1ad7b | 786 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 787 | if (err) { |
ab5f5e8b JL |
788 | xfrm_audit_policy_delete(pol, 0, |
789 | audit_info->loginuid, | |
2532386f | 790 | audit_info->sessionid, |
ab5f5e8b | 791 | audit_info->secid); |
4aa2e62c JL |
792 | return err; |
793 | } | |
7dc12d6d | 794 | } |
33ffbbd5 | 795 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
b67bfe0d | 796 | hlist_for_each_entry(pol, |
33ffbbd5 | 797 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
798 | bydst) { |
799 | if (pol->type != type) | |
800 | continue; | |
03e1ad7b PM |
801 | err = security_xfrm_policy_delete( |
802 | pol->security); | |
4aa2e62c | 803 | if (err) { |
ab5f5e8b JL |
804 | xfrm_audit_policy_delete(pol, 0, |
805 | audit_info->loginuid, | |
2532386f | 806 | audit_info->sessionid, |
ab5f5e8b | 807 | audit_info->secid); |
4aa2e62c JL |
808 | return err; |
809 | } | |
810 | } | |
811 | } | |
812 | } | |
813 | return err; | |
814 | } | |
815 | #else | |
816 | static inline int | |
33ffbbd5 | 817 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
818 | { |
819 | return 0; | |
820 | } | |
821 | #endif | |
822 | ||
33ffbbd5 | 823 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c | 824 | { |
2f1eb65f | 825 | int dir, err = 0, cnt = 0; |
1da177e4 | 826 | |
283bc9f3 | 827 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
4aa2e62c | 828 | |
33ffbbd5 | 829 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
4aa2e62c JL |
830 | if (err) |
831 | goto out; | |
832 | ||
1da177e4 | 833 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 | 834 | struct xfrm_policy *pol; |
29fa0b30 | 835 | int i; |
2518c7c2 DM |
836 | |
837 | again1: | |
b67bfe0d | 838 | hlist_for_each_entry(pol, |
33ffbbd5 | 839 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
840 | if (pol->type != type) |
841 | continue; | |
ea2dea9d | 842 | __xfrm_policy_unlink(pol, dir); |
283bc9f3 | 843 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ea2dea9d | 844 | cnt++; |
1da177e4 | 845 | |
ab5f5e8b | 846 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 847 | audit_info->sessionid, |
ab5f5e8b | 848 | audit_info->secid); |
161a09e7 | 849 | |
2518c7c2 | 850 | xfrm_policy_kill(pol); |
1da177e4 | 851 | |
283bc9f3 | 852 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
853 | goto again1; |
854 | } | |
855 | ||
33ffbbd5 | 856 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 | 857 | again2: |
b67bfe0d | 858 | hlist_for_each_entry(pol, |
33ffbbd5 | 859 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
860 | bydst) { |
861 | if (pol->type != type) | |
862 | continue; | |
ea2dea9d | 863 | __xfrm_policy_unlink(pol, dir); |
283bc9f3 | 864 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ea2dea9d | 865 | cnt++; |
2518c7c2 | 866 | |
ab5f5e8b JL |
867 | xfrm_audit_policy_delete(pol, 1, |
868 | audit_info->loginuid, | |
2532386f | 869 | audit_info->sessionid, |
ab5f5e8b | 870 | audit_info->secid); |
2518c7c2 DM |
871 | xfrm_policy_kill(pol); |
872 | ||
283bc9f3 | 873 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
874 | goto again2; |
875 | } | |
1da177e4 | 876 | } |
2518c7c2 | 877 | |
1da177e4 | 878 | } |
2f1eb65f JHS |
879 | if (!cnt) |
880 | err = -ESRCH; | |
4aa2e62c | 881 | out: |
283bc9f3 | 882 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
4aa2e62c | 883 | return err; |
1da177e4 LT |
884 | } |
885 | EXPORT_SYMBOL(xfrm_policy_flush); | |
886 | ||
cdcbca7c | 887 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 888 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
889 | void *data) |
890 | { | |
12a169e7 HX |
891 | struct xfrm_policy *pol; |
892 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
893 | int error = 0; |
894 | ||
895 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
896 | walk->type != XFRM_POLICY_TYPE_ANY) | |
897 | return -EINVAL; | |
1da177e4 | 898 | |
12a169e7 | 899 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
900 | return 0; |
901 | ||
283bc9f3 | 902 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
12a169e7 | 903 | if (list_empty(&walk->walk.all)) |
cdcbca7c | 904 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
905 | else |
906 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
cdcbca7c | 907 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 908 | if (x->dead) |
4c563f76 | 909 | continue; |
12a169e7 HX |
910 | pol = container_of(x, struct xfrm_policy, walk); |
911 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
912 | walk->type != pol->type) | |
913 | continue; | |
914 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
915 | walk->seq, data); | |
916 | if (error) { | |
917 | list_move_tail(&walk->walk.all, &x->all); | |
918 | goto out; | |
2518c7c2 | 919 | } |
12a169e7 | 920 | walk->seq++; |
1da177e4 | 921 | } |
12a169e7 | 922 | if (walk->seq == 0) { |
baf5d743 JHS |
923 | error = -ENOENT; |
924 | goto out; | |
925 | } | |
12a169e7 | 926 | list_del_init(&walk->walk.all); |
1da177e4 | 927 | out: |
283bc9f3 | 928 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
929 | return error; |
930 | } | |
931 | EXPORT_SYMBOL(xfrm_policy_walk); | |
932 | ||
12a169e7 HX |
933 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
934 | { | |
935 | INIT_LIST_HEAD(&walk->walk.all); | |
936 | walk->walk.dead = 1; | |
937 | walk->type = type; | |
938 | walk->seq = 0; | |
939 | } | |
940 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
941 | ||
283bc9f3 | 942 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net) |
12a169e7 HX |
943 | { |
944 | if (list_empty(&walk->walk.all)) | |
945 | return; | |
946 | ||
283bc9f3 | 947 | write_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */ |
12a169e7 | 948 | list_del(&walk->walk.all); |
283bc9f3 | 949 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
12a169e7 HX |
950 | } |
951 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
952 | ||
134b0fc5 JM |
953 | /* |
954 | * Find policy to apply to this flow. | |
955 | * | |
956 | * Returns 0 if policy found, else an -errno. | |
957 | */ | |
f299d557 DM |
958 | static int xfrm_policy_match(const struct xfrm_policy *pol, |
959 | const struct flowi *fl, | |
2518c7c2 | 960 | u8 type, u16 family, int dir) |
1da177e4 | 961 | { |
f299d557 | 962 | const struct xfrm_selector *sel = &pol->selector; |
bc9b35ad DM |
963 | int ret = -ESRCH; |
964 | bool match; | |
1da177e4 | 965 | |
2518c7c2 | 966 | if (pol->family != family || |
1d28f42c | 967 | (fl->flowi_mark & pol->mark.m) != pol->mark.v || |
2518c7c2 | 968 | pol->type != type) |
134b0fc5 | 969 | return ret; |
1da177e4 | 970 | |
2518c7c2 | 971 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 972 | if (match) |
1d28f42c | 973 | ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid, |
03e1ad7b | 974 | dir); |
2518c7c2 | 975 | |
134b0fc5 | 976 | return ret; |
2518c7c2 | 977 | } |
1da177e4 | 978 | |
52479b62 | 979 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
062cdb43 | 980 | const struct flowi *fl, |
2518c7c2 DM |
981 | u16 family, u8 dir) |
982 | { | |
134b0fc5 | 983 | int err; |
2518c7c2 | 984 | struct xfrm_policy *pol, *ret; |
0b597e7e | 985 | const xfrm_address_t *daddr, *saddr; |
2518c7c2 | 986 | struct hlist_head *chain; |
acba48e1 | 987 | u32 priority = ~0U; |
df71837d | 988 | |
2518c7c2 DM |
989 | daddr = xfrm_flowi_daddr(fl, family); |
990 | saddr = xfrm_flowi_saddr(fl, family); | |
991 | if (unlikely(!daddr || !saddr)) | |
992 | return NULL; | |
993 | ||
283bc9f3 | 994 | read_lock_bh(&net->xfrm.xfrm_policy_lock); |
52479b62 | 995 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 | 996 | ret = NULL; |
b67bfe0d | 997 | hlist_for_each_entry(pol, chain, bydst) { |
134b0fc5 JM |
998 | err = xfrm_policy_match(pol, fl, type, family, dir); |
999 | if (err) { | |
1000 | if (err == -ESRCH) | |
1001 | continue; | |
1002 | else { | |
1003 | ret = ERR_PTR(err); | |
1004 | goto fail; | |
1005 | } | |
1006 | } else { | |
2518c7c2 | 1007 | ret = pol; |
acba48e1 | 1008 | priority = ret->priority; |
2518c7c2 DM |
1009 | break; |
1010 | } | |
1011 | } | |
52479b62 | 1012 | chain = &net->xfrm.policy_inexact[dir]; |
b67bfe0d | 1013 | hlist_for_each_entry(pol, chain, bydst) { |
134b0fc5 JM |
1014 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1015 | if (err) { | |
1016 | if (err == -ESRCH) | |
1017 | continue; | |
1018 | else { | |
1019 | ret = ERR_PTR(err); | |
1020 | goto fail; | |
1021 | } | |
1022 | } else if (pol->priority < priority) { | |
acba48e1 DM |
1023 | ret = pol; |
1024 | break; | |
1da177e4 LT |
1025 | } |
1026 | } | |
acba48e1 DM |
1027 | if (ret) |
1028 | xfrm_pol_hold(ret); | |
134b0fc5 | 1029 | fail: |
283bc9f3 | 1030 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
4e81bb83 | 1031 | |
2518c7c2 | 1032 | return ret; |
4e81bb83 MN |
1033 | } |
1034 | ||
80c802f3 | 1035 | static struct xfrm_policy * |
73ff93cd | 1036 | __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir) |
80c802f3 TT |
1037 | { |
1038 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1039 | struct xfrm_policy *pol; | |
1040 | ||
1041 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
1042 | if (pol != NULL) | |
1043 | return pol; | |
1044 | #endif | |
1045 | return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
1046 | } | |
1047 | ||
b5fb82c4 BZ |
1048 | static int flow_to_policy_dir(int dir) |
1049 | { | |
1050 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
1051 | XFRM_POLICY_OUT == FLOW_DIR_OUT && | |
1052 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1053 | return dir; | |
1054 | ||
1055 | switch (dir) { | |
1056 | default: | |
1057 | case FLOW_DIR_IN: | |
1058 | return XFRM_POLICY_IN; | |
1059 | case FLOW_DIR_OUT: | |
1060 | return XFRM_POLICY_OUT; | |
1061 | case FLOW_DIR_FWD: | |
1062 | return XFRM_POLICY_FWD; | |
1063 | } | |
1064 | } | |
1065 | ||
fe1a5f03 | 1066 | static struct flow_cache_object * |
dee9f4bc | 1067 | xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, |
fe1a5f03 | 1068 | u8 dir, struct flow_cache_object *old_obj, void *ctx) |
4e81bb83 MN |
1069 | { |
1070 | struct xfrm_policy *pol; | |
fe1a5f03 TT |
1071 | |
1072 | if (old_obj) | |
1073 | xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); | |
4e81bb83 | 1074 | |
b5fb82c4 | 1075 | pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir)); |
80c802f3 | 1076 | if (IS_ERR_OR_NULL(pol)) |
fe1a5f03 | 1077 | return ERR_CAST(pol); |
fe1a5f03 | 1078 | |
fe1a5f03 TT |
1079 | /* Resolver returns two references: |
1080 | * one for cache and one for caller of flow_cache_lookup() */ | |
1081 | xfrm_pol_hold(pol); | |
1082 | ||
1083 | return &pol->flo; | |
1da177e4 LT |
1084 | } |
1085 | ||
df71837d TJ |
1086 | static inline int policy_to_flow_dir(int dir) |
1087 | { | |
1088 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1089 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1090 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1091 | return dir; | |
1092 | switch (dir) { | |
1093 | default: | |
1094 | case XFRM_POLICY_IN: | |
1095 | return FLOW_DIR_IN; | |
1096 | case XFRM_POLICY_OUT: | |
1097 | return FLOW_DIR_OUT; | |
1098 | case XFRM_POLICY_FWD: | |
1099 | return FLOW_DIR_FWD; | |
3ff50b79 | 1100 | } |
df71837d TJ |
1101 | } |
1102 | ||
dee9f4bc DM |
1103 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, |
1104 | const struct flowi *fl) | |
1da177e4 LT |
1105 | { |
1106 | struct xfrm_policy *pol; | |
283bc9f3 | 1107 | struct net *net = sock_net(sk); |
1da177e4 | 1108 | |
283bc9f3 | 1109 | read_lock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 1110 | if ((pol = sk->sk_policy[dir]) != NULL) { |
bc9b35ad DM |
1111 | bool match = xfrm_selector_match(&pol->selector, fl, |
1112 | sk->sk_family); | |
a716c119 | 1113 | int err = 0; |
df71837d | 1114 | |
3bccfbc7 | 1115 | if (match) { |
34f8d884 JHS |
1116 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
1117 | pol = NULL; | |
1118 | goto out; | |
1119 | } | |
03e1ad7b | 1120 | err = security_xfrm_policy_lookup(pol->security, |
1d28f42c | 1121 | fl->flowi_secid, |
03e1ad7b | 1122 | policy_to_flow_dir(dir)); |
3bccfbc7 VY |
1123 | if (!err) |
1124 | xfrm_pol_hold(pol); | |
1125 | else if (err == -ESRCH) | |
1126 | pol = NULL; | |
1127 | else | |
1128 | pol = ERR_PTR(err); | |
1129 | } else | |
1da177e4 LT |
1130 | pol = NULL; |
1131 | } | |
34f8d884 | 1132 | out: |
283bc9f3 | 1133 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1134 | return pol; |
1135 | } | |
1136 | ||
1137 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1138 | { | |
98806f75 | 1139 | struct net *net = xp_net(pol); |
1121994c | 1140 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
2518c7c2 | 1141 | pol->family, dir); |
4e81bb83 | 1142 | |
98806f75 | 1143 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
2518c7c2 | 1144 | hlist_add_head(&pol->bydst, chain); |
e92303f8 | 1145 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
98806f75 | 1146 | net->xfrm.policy_count[dir]++; |
1da177e4 | 1147 | xfrm_pol_hold(pol); |
2518c7c2 | 1148 | |
98806f75 AD |
1149 | if (xfrm_bydst_should_resize(net, dir, NULL)) |
1150 | schedule_work(&net->xfrm.policy_hash_work); | |
1da177e4 LT |
1151 | } |
1152 | ||
1153 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1154 | int dir) | |
1155 | { | |
98806f75 AD |
1156 | struct net *net = xp_net(pol); |
1157 | ||
2518c7c2 DM |
1158 | if (hlist_unhashed(&pol->bydst)) |
1159 | return NULL; | |
1da177e4 | 1160 | |
2518c7c2 DM |
1161 | hlist_del(&pol->bydst); |
1162 | hlist_del(&pol->byidx); | |
12a169e7 | 1163 | list_del(&pol->walk.all); |
98806f75 | 1164 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1165 | |
1166 | return pol; | |
1da177e4 LT |
1167 | } |
1168 | ||
4666faab | 1169 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 | 1170 | { |
283bc9f3 FD |
1171 | struct net *net = xp_net(pol); |
1172 | ||
1173 | write_lock_bh(&net->xfrm.xfrm_policy_lock); | |
1da177e4 | 1174 | pol = __xfrm_policy_unlink(pol, dir); |
283bc9f3 | 1175 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 1176 | if (pol) { |
1da177e4 | 1177 | xfrm_policy_kill(pol); |
4666faab | 1178 | return 0; |
1da177e4 | 1179 | } |
4666faab | 1180 | return -ENOENT; |
1da177e4 | 1181 | } |
a70fcb0b | 1182 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1183 | |
1184 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1185 | { | |
1121994c | 1186 | struct net *net = xp_net(pol); |
1da177e4 LT |
1187 | struct xfrm_policy *old_pol; |
1188 | ||
4e81bb83 MN |
1189 | #ifdef CONFIG_XFRM_SUB_POLICY |
1190 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1191 | return -EINVAL; | |
1192 | #endif | |
1193 | ||
283bc9f3 | 1194 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1195 | old_pol = sk->sk_policy[dir]; |
1196 | sk->sk_policy[dir] = pol; | |
1197 | if (pol) { | |
9d729f72 | 1198 | pol->curlft.add_time = get_seconds(); |
e682adf0 | 1199 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0); |
1da177e4 LT |
1200 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1201 | } | |
a0073fe1 SK |
1202 | if (old_pol) { |
1203 | if (pol) | |
1204 | xfrm_policy_requeue(old_pol, pol); | |
1205 | ||
ea2dea9d TT |
1206 | /* Unlinking succeeds always. This is the only function |
1207 | * allowed to delete or replace socket policy. | |
1208 | */ | |
1da177e4 | 1209 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); |
a0073fe1 | 1210 | } |
283bc9f3 | 1211 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1212 | |
1213 | if (old_pol) { | |
1214 | xfrm_policy_kill(old_pol); | |
1215 | } | |
1216 | return 0; | |
1217 | } | |
1218 | ||
d3e40a9f | 1219 | static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir) |
1da177e4 | 1220 | { |
0331b1f3 | 1221 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
283bc9f3 | 1222 | struct net *net = xp_net(old); |
1da177e4 LT |
1223 | |
1224 | if (newp) { | |
1225 | newp->selector = old->selector; | |
03e1ad7b PM |
1226 | if (security_xfrm_policy_clone(old->security, |
1227 | &newp->security)) { | |
df71837d TJ |
1228 | kfree(newp); |
1229 | return NULL; /* ENOMEM */ | |
1230 | } | |
1da177e4 LT |
1231 | newp->lft = old->lft; |
1232 | newp->curlft = old->curlft; | |
fb977e2c | 1233 | newp->mark = old->mark; |
1da177e4 LT |
1234 | newp->action = old->action; |
1235 | newp->flags = old->flags; | |
1236 | newp->xfrm_nr = old->xfrm_nr; | |
1237 | newp->index = old->index; | |
4e81bb83 | 1238 | newp->type = old->type; |
1da177e4 LT |
1239 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1240 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
283bc9f3 | 1241 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 1242 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); |
283bc9f3 | 1243 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1244 | xfrm_pol_put(newp); |
1245 | } | |
1246 | return newp; | |
1247 | } | |
1248 | ||
1249 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1250 | { | |
1251 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1252 | *p1 = sk->sk_policy[1]; | |
1253 | ||
1254 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1255 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1256 | return -ENOMEM; | |
1257 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1258 | return -ENOMEM; | |
1259 | return 0; | |
1260 | } | |
1261 | ||
a1e59abf | 1262 | static int |
fbda33b2 | 1263 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
a1e59abf PM |
1264 | unsigned short family) |
1265 | { | |
1266 | int err; | |
1267 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1268 | ||
1269 | if (unlikely(afinfo == NULL)) | |
1270 | return -EINVAL; | |
fbda33b2 | 1271 | err = afinfo->get_saddr(net, local, remote); |
a1e59abf PM |
1272 | xfrm_policy_put_afinfo(afinfo); |
1273 | return err; | |
1274 | } | |
1275 | ||
1da177e4 LT |
1276 | /* Resolve list of templates for the flow, given policy. */ |
1277 | ||
1278 | static int | |
a6c2e611 DM |
1279 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl, |
1280 | struct xfrm_state **xfrm, unsigned short family) | |
1da177e4 | 1281 | { |
fbda33b2 | 1282 | struct net *net = xp_net(policy); |
1da177e4 LT |
1283 | int nx; |
1284 | int i, error; | |
1285 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1286 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1287 | xfrm_address_t tmp; |
1da177e4 LT |
1288 | |
1289 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1290 | struct xfrm_state *x; | |
1291 | xfrm_address_t *remote = daddr; | |
1292 | xfrm_address_t *local = saddr; | |
1293 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1294 | ||
48b8d783 JK |
1295 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1296 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1297 | remote = &tmpl->id.daddr; |
1298 | local = &tmpl->saddr; | |
8444cf71 TE |
1299 | if (xfrm_addr_any(local, tmpl->encap_family)) { |
1300 | error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family); | |
a1e59abf PM |
1301 | if (error) |
1302 | goto fail; | |
1303 | local = &tmp; | |
1304 | } | |
1da177e4 LT |
1305 | } |
1306 | ||
1307 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1308 | ||
1309 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1310 | xfrm[nx++] = x; | |
1311 | daddr = remote; | |
1312 | saddr = local; | |
1313 | continue; | |
1314 | } | |
1315 | if (x) { | |
1316 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1317 | -EINVAL : -EAGAIN); | |
1318 | xfrm_state_put(x); | |
1319 | } | |
a4322266 | 1320 | else if (error == -ESRCH) |
1321 | error = -EAGAIN; | |
1da177e4 LT |
1322 | |
1323 | if (!tmpl->optional) | |
1324 | goto fail; | |
1325 | } | |
1326 | return nx; | |
1327 | ||
1328 | fail: | |
1329 | for (nx--; nx>=0; nx--) | |
1330 | xfrm_state_put(xfrm[nx]); | |
1331 | return error; | |
1332 | } | |
1333 | ||
4e81bb83 | 1334 | static int |
a6c2e611 DM |
1335 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl, |
1336 | struct xfrm_state **xfrm, unsigned short family) | |
4e81bb83 | 1337 | { |
41a49cc3 MN |
1338 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1339 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1340 | int cnx = 0; |
1341 | int error; | |
1342 | int ret; | |
1343 | int i; | |
1344 | ||
1345 | for (i = 0; i < npols; i++) { | |
1346 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1347 | error = -ENOBUFS; | |
1348 | goto fail; | |
1349 | } | |
41a49cc3 MN |
1350 | |
1351 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1352 | if (ret < 0) { |
1353 | error = ret; | |
1354 | goto fail; | |
1355 | } else | |
1356 | cnx += ret; | |
1357 | } | |
1358 | ||
41a49cc3 MN |
1359 | /* found states are sorted for outbound processing */ |
1360 | if (npols > 1) | |
1361 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1362 | ||
4e81bb83 MN |
1363 | return cnx; |
1364 | ||
1365 | fail: | |
1366 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1367 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1368 | return error; |
1369 | ||
1370 | } | |
1371 | ||
1da177e4 LT |
1372 | /* Check that the bundle accepts the flow and its components are |
1373 | * still valid. | |
1374 | */ | |
1375 | ||
05d84025 | 1376 | static inline int xfrm_get_tos(const struct flowi *fl, int family) |
25ee3286 HX |
1377 | { |
1378 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1379 | int tos; | |
1da177e4 | 1380 | |
25ee3286 HX |
1381 | if (!afinfo) |
1382 | return -EINVAL; | |
1383 | ||
1384 | tos = afinfo->get_tos(fl); | |
1385 | ||
1386 | xfrm_policy_put_afinfo(afinfo); | |
1387 | ||
1388 | return tos; | |
1389 | } | |
1390 | ||
80c802f3 TT |
1391 | static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) |
1392 | { | |
1393 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1394 | struct dst_entry *dst = &xdst->u.dst; | |
1395 | ||
1396 | if (xdst->route == NULL) { | |
1397 | /* Dummy bundle - if it has xfrms we were not | |
1398 | * able to build bundle as template resolution failed. | |
1399 | * It means we need to try again resolving. */ | |
1400 | if (xdst->num_xfrms > 0) | |
1401 | return NULL; | |
a0073fe1 SK |
1402 | } else if (dst->flags & DST_XFRM_QUEUE) { |
1403 | return NULL; | |
80c802f3 TT |
1404 | } else { |
1405 | /* Real bundle */ | |
1406 | if (stale_bundle(dst)) | |
1407 | return NULL; | |
1408 | } | |
1409 | ||
1410 | dst_hold(dst); | |
1411 | return flo; | |
1412 | } | |
1413 | ||
1414 | static int xfrm_bundle_flo_check(struct flow_cache_object *flo) | |
1415 | { | |
1416 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1417 | struct dst_entry *dst = &xdst->u.dst; | |
1418 | ||
1419 | if (!xdst->route) | |
1420 | return 0; | |
1421 | if (stale_bundle(dst)) | |
1422 | return 0; | |
1423 | ||
1424 | return 1; | |
1425 | } | |
1426 | ||
1427 | static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) | |
1428 | { | |
1429 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1430 | struct dst_entry *dst = &xdst->u.dst; | |
1431 | ||
1432 | dst_free(dst); | |
1433 | } | |
1434 | ||
1435 | static const struct flow_cache_ops xfrm_bundle_fc_ops = { | |
1436 | .get = xfrm_bundle_flo_get, | |
1437 | .check = xfrm_bundle_flo_check, | |
1438 | .delete = xfrm_bundle_flo_delete, | |
1439 | }; | |
1440 | ||
d7c7544c | 1441 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1442 | { |
1da177e4 | 1443 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1444 | struct dst_ops *dst_ops; |
25ee3286 HX |
1445 | struct xfrm_dst *xdst; |
1446 | ||
1447 | if (!afinfo) | |
1448 | return ERR_PTR(-EINVAL); | |
1449 | ||
d7c7544c AD |
1450 | switch (family) { |
1451 | case AF_INET: | |
1452 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1453 | break; | |
dfd56b8b | 1454 | #if IS_ENABLED(CONFIG_IPV6) |
d7c7544c AD |
1455 | case AF_INET6: |
1456 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1457 | break; | |
1458 | #endif | |
1459 | default: | |
1460 | BUG(); | |
1461 | } | |
f5b0a874 | 1462 | xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0); |
25ee3286 | 1463 | |
d4cae562 | 1464 | if (likely(xdst)) { |
141e369d SK |
1465 | struct dst_entry *dst = &xdst->u.dst; |
1466 | ||
1467 | memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst)); | |
0b150932 | 1468 | xdst->flo.ops = &xfrm_bundle_fc_ops; |
9d7b0fc1 PM |
1469 | if (afinfo->init_dst) |
1470 | afinfo->init_dst(net, xdst); | |
d4cae562 | 1471 | } else |
0b150932 | 1472 | xdst = ERR_PTR(-ENOBUFS); |
80c802f3 | 1473 | |
d4cae562 MB |
1474 | xfrm_policy_put_afinfo(afinfo); |
1475 | ||
25ee3286 HX |
1476 | return xdst; |
1477 | } | |
1478 | ||
a1b05140 MN |
1479 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1480 | int nfheader_len) | |
1481 | { | |
1482 | struct xfrm_policy_afinfo *afinfo = | |
1483 | xfrm_policy_get_afinfo(dst->ops->family); | |
1484 | int err; | |
1485 | ||
1486 | if (!afinfo) | |
1487 | return -EINVAL; | |
1488 | ||
1489 | err = afinfo->init_path(path, dst, nfheader_len); | |
1490 | ||
1491 | xfrm_policy_put_afinfo(afinfo); | |
1492 | ||
1493 | return err; | |
1494 | } | |
1495 | ||
87c1e12b | 1496 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 1497 | const struct flowi *fl) |
25ee3286 HX |
1498 | { |
1499 | struct xfrm_policy_afinfo *afinfo = | |
1500 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1501 | int err; | |
1502 | ||
1503 | if (!afinfo) | |
1da177e4 | 1504 | return -EINVAL; |
25ee3286 | 1505 | |
87c1e12b | 1506 | err = afinfo->fill_dst(xdst, dev, fl); |
25ee3286 | 1507 | |
1da177e4 | 1508 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1509 | |
1da177e4 LT |
1510 | return err; |
1511 | } | |
1512 | ||
80c802f3 | 1513 | |
25ee3286 HX |
1514 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1515 | * all the metrics... Shortly, bundle a bundle. | |
1516 | */ | |
1517 | ||
1518 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1519 | struct xfrm_state **xfrm, int nx, | |
98313ada | 1520 | const struct flowi *fl, |
25ee3286 HX |
1521 | struct dst_entry *dst) |
1522 | { | |
d7c7544c | 1523 | struct net *net = xp_net(policy); |
25ee3286 HX |
1524 | unsigned long now = jiffies; |
1525 | struct net_device *dev; | |
43a4dea4 | 1526 | struct xfrm_mode *inner_mode; |
25ee3286 HX |
1527 | struct dst_entry *dst_prev = NULL; |
1528 | struct dst_entry *dst0 = NULL; | |
1529 | int i = 0; | |
1530 | int err; | |
1531 | int header_len = 0; | |
a1b05140 | 1532 | int nfheader_len = 0; |
25ee3286 HX |
1533 | int trailer_len = 0; |
1534 | int tos; | |
1535 | int family = policy->selector.family; | |
9bb182a7 YH |
1536 | xfrm_address_t saddr, daddr; |
1537 | ||
1538 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1539 | |
1540 | tos = xfrm_get_tos(fl, family); | |
1541 | err = tos; | |
1542 | if (tos < 0) | |
1543 | goto put_states; | |
1544 | ||
1545 | dst_hold(dst); | |
1546 | ||
1547 | for (; i < nx; i++) { | |
d7c7544c | 1548 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1549 | struct dst_entry *dst1 = &xdst->u.dst; |
1550 | ||
1551 | err = PTR_ERR(xdst); | |
1552 | if (IS_ERR(xdst)) { | |
1553 | dst_release(dst); | |
1554 | goto put_states; | |
1555 | } | |
1556 | ||
43a4dea4 SK |
1557 | if (xfrm[i]->sel.family == AF_UNSPEC) { |
1558 | inner_mode = xfrm_ip2inner_mode(xfrm[i], | |
1559 | xfrm_af2proto(family)); | |
1560 | if (!inner_mode) { | |
1561 | err = -EAFNOSUPPORT; | |
1562 | dst_release(dst); | |
1563 | goto put_states; | |
1564 | } | |
1565 | } else | |
1566 | inner_mode = xfrm[i]->inner_mode; | |
1567 | ||
25ee3286 HX |
1568 | if (!dst_prev) |
1569 | dst0 = dst1; | |
1570 | else { | |
1571 | dst_prev->child = dst_clone(dst1); | |
1572 | dst1->flags |= DST_NOHASH; | |
1573 | } | |
1574 | ||
1575 | xdst->route = dst; | |
defb3519 | 1576 | dst_copy_metrics(dst1, dst); |
25ee3286 HX |
1577 | |
1578 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1579 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1580 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1581 | family); | |
25ee3286 HX |
1582 | err = PTR_ERR(dst); |
1583 | if (IS_ERR(dst)) | |
1584 | goto put_states; | |
1585 | } else | |
1586 | dst_hold(dst); | |
1587 | ||
1588 | dst1->xfrm = xfrm[i]; | |
80c802f3 | 1589 | xdst->xfrm_genid = xfrm[i]->genid; |
25ee3286 | 1590 | |
f5b0a874 | 1591 | dst1->obsolete = DST_OBSOLETE_FORCE_CHK; |
25ee3286 HX |
1592 | dst1->flags |= DST_HOST; |
1593 | dst1->lastuse = now; | |
1594 | ||
1595 | dst1->input = dst_discard; | |
43a4dea4 | 1596 | dst1->output = inner_mode->afinfo->output; |
25ee3286 HX |
1597 | |
1598 | dst1->next = dst_prev; | |
1599 | dst_prev = dst1; | |
1600 | ||
1601 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1602 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1603 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1604 | trailer_len += xfrm[i]->props.trailer_len; |
1605 | } | |
1606 | ||
1607 | dst_prev->child = dst; | |
1608 | dst0->path = dst; | |
1609 | ||
1610 | err = -ENODEV; | |
1611 | dev = dst->dev; | |
1612 | if (!dev) | |
1613 | goto free_dst; | |
1614 | ||
a1b05140 | 1615 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1616 | xfrm_init_pmtu(dst_prev); |
1617 | ||
1618 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1619 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1620 | ||
87c1e12b | 1621 | err = xfrm_fill_dst(xdst, dev, fl); |
25ee3286 HX |
1622 | if (err) |
1623 | goto free_dst; | |
1624 | ||
1625 | dst_prev->header_len = header_len; | |
1626 | dst_prev->trailer_len = trailer_len; | |
1627 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1628 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1629 | } | |
1630 | ||
1631 | out: | |
1632 | return dst0; | |
1633 | ||
1634 | put_states: | |
1635 | for (; i < nx; i++) | |
1636 | xfrm_state_put(xfrm[i]); | |
1637 | free_dst: | |
1638 | if (dst0) | |
1639 | dst_free(dst0); | |
1640 | dst0 = ERR_PTR(err); | |
1641 | goto out; | |
1642 | } | |
1643 | ||
157bfc25 | 1644 | static int inline |
3f0e18fb | 1645 | xfrm_dst_alloc_copy(void **target, const void *src, int size) |
157bfc25 MN |
1646 | { |
1647 | if (!*target) { | |
1648 | *target = kmalloc(size, GFP_ATOMIC); | |
1649 | if (!*target) | |
1650 | return -ENOMEM; | |
1651 | } | |
1652 | memcpy(*target, src, size); | |
1653 | return 0; | |
1654 | } | |
1655 | ||
1656 | static int inline | |
1786b389 | 1657 | xfrm_dst_update_parent(struct dst_entry *dst, const struct xfrm_selector *sel) |
157bfc25 MN |
1658 | { |
1659 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1660 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1661 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1662 | sel, sizeof(*sel)); | |
1663 | #else | |
1664 | return 0; | |
1665 | #endif | |
1666 | } | |
1667 | ||
1668 | static int inline | |
3f0e18fb | 1669 | xfrm_dst_update_origin(struct dst_entry *dst, const struct flowi *fl) |
157bfc25 MN |
1670 | { |
1671 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1672 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1673 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1674 | #else | |
1675 | return 0; | |
1676 | #endif | |
1677 | } | |
1da177e4 | 1678 | |
73ff93cd | 1679 | static int xfrm_expand_policies(const struct flowi *fl, u16 family, |
80c802f3 TT |
1680 | struct xfrm_policy **pols, |
1681 | int *num_pols, int *num_xfrms) | |
1682 | { | |
1683 | int i; | |
1684 | ||
1685 | if (*num_pols == 0 || !pols[0]) { | |
1686 | *num_pols = 0; | |
1687 | *num_xfrms = 0; | |
1688 | return 0; | |
1689 | } | |
1690 | if (IS_ERR(pols[0])) | |
1691 | return PTR_ERR(pols[0]); | |
1692 | ||
1693 | *num_xfrms = pols[0]->xfrm_nr; | |
1694 | ||
1695 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1696 | if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW && | |
1697 | pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1698 | pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), | |
1699 | XFRM_POLICY_TYPE_MAIN, | |
1700 | fl, family, | |
1701 | XFRM_POLICY_OUT); | |
1702 | if (pols[1]) { | |
1703 | if (IS_ERR(pols[1])) { | |
1704 | xfrm_pols_put(pols, *num_pols); | |
1705 | return PTR_ERR(pols[1]); | |
1706 | } | |
1707 | (*num_pols) ++; | |
1708 | (*num_xfrms) += pols[1]->xfrm_nr; | |
1709 | } | |
1710 | } | |
1711 | #endif | |
1712 | for (i = 0; i < *num_pols; i++) { | |
1713 | if (pols[i]->action != XFRM_POLICY_ALLOW) { | |
1714 | *num_xfrms = -1; | |
1715 | break; | |
1716 | } | |
1717 | } | |
1718 | ||
1719 | return 0; | |
1720 | ||
1721 | } | |
1722 | ||
1723 | static struct xfrm_dst * | |
1724 | xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, | |
4ca2e685 | 1725 | const struct flowi *fl, u16 family, |
80c802f3 TT |
1726 | struct dst_entry *dst_orig) |
1727 | { | |
1728 | struct net *net = xp_net(pols[0]); | |
1729 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
1730 | struct dst_entry *dst; | |
1731 | struct xfrm_dst *xdst; | |
1732 | int err; | |
1733 | ||
1734 | /* Try to instantiate a bundle */ | |
1735 | err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); | |
d809ec89 TT |
1736 | if (err <= 0) { |
1737 | if (err != 0 && err != -EAGAIN) | |
80c802f3 TT |
1738 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
1739 | return ERR_PTR(err); | |
1740 | } | |
1741 | ||
1742 | dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig); | |
1743 | if (IS_ERR(dst)) { | |
1744 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1745 | return ERR_CAST(dst); | |
1746 | } | |
1747 | ||
1748 | xdst = (struct xfrm_dst *)dst; | |
1749 | xdst->num_xfrms = err; | |
1750 | if (num_pols > 1) | |
1751 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1752 | else | |
1753 | err = xfrm_dst_update_origin(dst, fl); | |
1754 | if (unlikely(err)) { | |
1755 | dst_free(dst); | |
1756 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
1757 | return ERR_PTR(err); | |
1758 | } | |
1759 | ||
1760 | xdst->num_pols = num_pols; | |
1761 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1762 | xdst->policy_genid = atomic_read(&pols[0]->genid); | |
1763 | ||
1764 | return xdst; | |
1765 | } | |
1766 | ||
a0073fe1 SK |
1767 | static void xfrm_policy_queue_process(unsigned long arg) |
1768 | { | |
1769 | int err = 0; | |
1770 | struct sk_buff *skb; | |
1771 | struct sock *sk; | |
1772 | struct dst_entry *dst; | |
a0073fe1 SK |
1773 | struct xfrm_policy *pol = (struct xfrm_policy *)arg; |
1774 | struct xfrm_policy_queue *pq = &pol->polq; | |
1775 | struct flowi fl; | |
1776 | struct sk_buff_head list; | |
1777 | ||
1778 | spin_lock(&pq->hold_queue.lock); | |
1779 | skb = skb_peek(&pq->hold_queue); | |
2bb53e25 SK |
1780 | if (!skb) { |
1781 | spin_unlock(&pq->hold_queue.lock); | |
1782 | goto out; | |
1783 | } | |
a0073fe1 SK |
1784 | dst = skb_dst(skb); |
1785 | sk = skb->sk; | |
1786 | xfrm_decode_session(skb, &fl, dst->ops->family); | |
1787 | spin_unlock(&pq->hold_queue.lock); | |
1788 | ||
1789 | dst_hold(dst->path); | |
1790 | dst = xfrm_lookup(xp_net(pol), dst->path, &fl, | |
1791 | sk, 0); | |
1792 | if (IS_ERR(dst)) | |
1793 | goto purge_queue; | |
1794 | ||
1795 | if (dst->flags & DST_XFRM_QUEUE) { | |
1796 | dst_release(dst); | |
1797 | ||
1798 | if (pq->timeout >= XFRM_QUEUE_TMO_MAX) | |
1799 | goto purge_queue; | |
1800 | ||
1801 | pq->timeout = pq->timeout << 1; | |
e7d8f6cb SK |
1802 | if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout)) |
1803 | xfrm_pol_hold(pol); | |
1804 | goto out; | |
a0073fe1 SK |
1805 | } |
1806 | ||
1807 | dst_release(dst); | |
1808 | ||
1809 | __skb_queue_head_init(&list); | |
1810 | ||
1811 | spin_lock(&pq->hold_queue.lock); | |
1812 | pq->timeout = 0; | |
1813 | skb_queue_splice_init(&pq->hold_queue, &list); | |
1814 | spin_unlock(&pq->hold_queue.lock); | |
1815 | ||
1816 | while (!skb_queue_empty(&list)) { | |
1817 | skb = __skb_dequeue(&list); | |
1818 | ||
1819 | xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family); | |
1820 | dst_hold(skb_dst(skb)->path); | |
1821 | dst = xfrm_lookup(xp_net(pol), skb_dst(skb)->path, | |
1822 | &fl, skb->sk, 0); | |
1823 | if (IS_ERR(dst)) { | |
a0073fe1 SK |
1824 | kfree_skb(skb); |
1825 | continue; | |
1826 | } | |
1827 | ||
1828 | nf_reset(skb); | |
1829 | skb_dst_drop(skb); | |
1830 | skb_dst_set(skb, dst); | |
1831 | ||
a0073fe1 | 1832 | err = dst_output(skb); |
a0073fe1 SK |
1833 | } |
1834 | ||
e7d8f6cb SK |
1835 | out: |
1836 | xfrm_pol_put(pol); | |
a0073fe1 SK |
1837 | return; |
1838 | ||
1839 | purge_queue: | |
1840 | pq->timeout = 0; | |
1841 | xfrm_queue_purge(&pq->hold_queue); | |
e7d8f6cb | 1842 | xfrm_pol_put(pol); |
a0073fe1 SK |
1843 | } |
1844 | ||
1845 | static int xdst_queue_output(struct sk_buff *skb) | |
1846 | { | |
1847 | unsigned long sched_next; | |
1848 | struct dst_entry *dst = skb_dst(skb); | |
1849 | struct xfrm_dst *xdst = (struct xfrm_dst *) dst; | |
e7d8f6cb SK |
1850 | struct xfrm_policy *pol = xdst->pols[0]; |
1851 | struct xfrm_policy_queue *pq = &pol->polq; | |
4d53eff4 SK |
1852 | const struct sk_buff *fclone = skb + 1; |
1853 | ||
1854 | if (unlikely(skb->fclone == SKB_FCLONE_ORIG && | |
1855 | fclone->fclone == SKB_FCLONE_CLONE)) { | |
1856 | kfree_skb(skb); | |
1857 | return 0; | |
1858 | } | |
a0073fe1 SK |
1859 | |
1860 | if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) { | |
1861 | kfree_skb(skb); | |
1862 | return -EAGAIN; | |
1863 | } | |
1864 | ||
1865 | skb_dst_force(skb); | |
a0073fe1 SK |
1866 | |
1867 | spin_lock_bh(&pq->hold_queue.lock); | |
1868 | ||
1869 | if (!pq->timeout) | |
1870 | pq->timeout = XFRM_QUEUE_TMO_MIN; | |
1871 | ||
1872 | sched_next = jiffies + pq->timeout; | |
1873 | ||
1874 | if (del_timer(&pq->hold_timer)) { | |
1875 | if (time_before(pq->hold_timer.expires, sched_next)) | |
1876 | sched_next = pq->hold_timer.expires; | |
e7d8f6cb | 1877 | xfrm_pol_put(pol); |
a0073fe1 SK |
1878 | } |
1879 | ||
1880 | __skb_queue_tail(&pq->hold_queue, skb); | |
e7d8f6cb SK |
1881 | if (!mod_timer(&pq->hold_timer, sched_next)) |
1882 | xfrm_pol_hold(pol); | |
a0073fe1 SK |
1883 | |
1884 | spin_unlock_bh(&pq->hold_queue.lock); | |
1885 | ||
1886 | return 0; | |
1887 | } | |
1888 | ||
1889 | static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net, | |
1890 | struct dst_entry *dst, | |
1891 | const struct flowi *fl, | |
1892 | int num_xfrms, | |
1893 | u16 family) | |
1894 | { | |
1895 | int err; | |
1896 | struct net_device *dev; | |
1897 | struct dst_entry *dst1; | |
1898 | struct xfrm_dst *xdst; | |
1899 | ||
1900 | xdst = xfrm_alloc_dst(net, family); | |
1901 | if (IS_ERR(xdst)) | |
1902 | return xdst; | |
1903 | ||
5b8ef341 | 1904 | if (net->xfrm.sysctl_larval_drop || num_xfrms <= 0) |
a0073fe1 SK |
1905 | return xdst; |
1906 | ||
1907 | dst1 = &xdst->u.dst; | |
1908 | dst_hold(dst); | |
1909 | xdst->route = dst; | |
1910 | ||
1911 | dst_copy_metrics(dst1, dst); | |
1912 | ||
1913 | dst1->obsolete = DST_OBSOLETE_FORCE_CHK; | |
1914 | dst1->flags |= DST_HOST | DST_XFRM_QUEUE; | |
1915 | dst1->lastuse = jiffies; | |
1916 | ||
1917 | dst1->input = dst_discard; | |
1918 | dst1->output = xdst_queue_output; | |
1919 | ||
1920 | dst_hold(dst); | |
1921 | dst1->child = dst; | |
1922 | dst1->path = dst; | |
1923 | ||
1924 | xfrm_init_path((struct xfrm_dst *)dst1, dst, 0); | |
1925 | ||
1926 | err = -ENODEV; | |
1927 | dev = dst->dev; | |
1928 | if (!dev) | |
1929 | goto free_dst; | |
1930 | ||
1931 | err = xfrm_fill_dst(xdst, dev, fl); | |
1932 | if (err) | |
1933 | goto free_dst; | |
1934 | ||
1935 | out: | |
1936 | return xdst; | |
1937 | ||
1938 | free_dst: | |
1939 | dst_release(dst1); | |
1940 | xdst = ERR_PTR(err); | |
1941 | goto out; | |
1942 | } | |
1943 | ||
80c802f3 | 1944 | static struct flow_cache_object * |
dee9f4bc | 1945 | xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir, |
80c802f3 TT |
1946 | struct flow_cache_object *oldflo, void *ctx) |
1947 | { | |
1948 | struct dst_entry *dst_orig = (struct dst_entry *)ctx; | |
1949 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; | |
1950 | struct xfrm_dst *xdst, *new_xdst; | |
1951 | int num_pols = 0, num_xfrms = 0, i, err, pol_dead; | |
1952 | ||
1953 | /* Check if the policies from old bundle are usable */ | |
1954 | xdst = NULL; | |
1955 | if (oldflo) { | |
1956 | xdst = container_of(oldflo, struct xfrm_dst, flo); | |
1957 | num_pols = xdst->num_pols; | |
1958 | num_xfrms = xdst->num_xfrms; | |
1959 | pol_dead = 0; | |
1960 | for (i = 0; i < num_pols; i++) { | |
1961 | pols[i] = xdst->pols[i]; | |
1962 | pol_dead |= pols[i]->walk.dead; | |
1963 | } | |
1964 | if (pol_dead) { | |
1965 | dst_free(&xdst->u.dst); | |
1966 | xdst = NULL; | |
1967 | num_pols = 0; | |
1968 | num_xfrms = 0; | |
1969 | oldflo = NULL; | |
1970 | } | |
1971 | } | |
1972 | ||
1973 | /* Resolve policies to use if we couldn't get them from | |
1974 | * previous cache entry */ | |
1975 | if (xdst == NULL) { | |
1976 | num_pols = 1; | |
b5fb82c4 BZ |
1977 | pols[0] = __xfrm_policy_lookup(net, fl, family, |
1978 | flow_to_policy_dir(dir)); | |
80c802f3 TT |
1979 | err = xfrm_expand_policies(fl, family, pols, |
1980 | &num_pols, &num_xfrms); | |
1981 | if (err < 0) | |
1982 | goto inc_error; | |
1983 | if (num_pols == 0) | |
1984 | return NULL; | |
1985 | if (num_xfrms <= 0) | |
1986 | goto make_dummy_bundle; | |
1987 | } | |
1988 | ||
1989 | new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig); | |
1990 | if (IS_ERR(new_xdst)) { | |
1991 | err = PTR_ERR(new_xdst); | |
1992 | if (err != -EAGAIN) | |
1993 | goto error; | |
1994 | if (oldflo == NULL) | |
1995 | goto make_dummy_bundle; | |
1996 | dst_hold(&xdst->u.dst); | |
1997 | return oldflo; | |
d809ec89 TT |
1998 | } else if (new_xdst == NULL) { |
1999 | num_xfrms = 0; | |
2000 | if (oldflo == NULL) | |
2001 | goto make_dummy_bundle; | |
2002 | xdst->num_xfrms = 0; | |
2003 | dst_hold(&xdst->u.dst); | |
2004 | return oldflo; | |
80c802f3 TT |
2005 | } |
2006 | ||
2007 | /* Kill the previous bundle */ | |
2008 | if (xdst) { | |
2009 | /* The policies were stolen for newly generated bundle */ | |
2010 | xdst->num_pols = 0; | |
2011 | dst_free(&xdst->u.dst); | |
2012 | } | |
2013 | ||
2014 | /* Flow cache does not have reference, it dst_free()'s, | |
2015 | * but we do need to return one reference for original caller */ | |
2016 | dst_hold(&new_xdst->u.dst); | |
2017 | return &new_xdst->flo; | |
2018 | ||
2019 | make_dummy_bundle: | |
2020 | /* We found policies, but there's no bundles to instantiate: | |
2021 | * either because the policy blocks, has no transformations or | |
2022 | * we could not build template (no xfrm_states).*/ | |
a0073fe1 | 2023 | xdst = xfrm_create_dummy_bundle(net, dst_orig, fl, num_xfrms, family); |
80c802f3 TT |
2024 | if (IS_ERR(xdst)) { |
2025 | xfrm_pols_put(pols, num_pols); | |
2026 | return ERR_CAST(xdst); | |
2027 | } | |
2028 | xdst->num_pols = num_pols; | |
2029 | xdst->num_xfrms = num_xfrms; | |
2030 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
2031 | ||
2032 | dst_hold(&xdst->u.dst); | |
2033 | return &xdst->flo; | |
2034 | ||
2035 | inc_error: | |
2036 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); | |
2037 | error: | |
2038 | if (xdst != NULL) | |
2039 | dst_free(&xdst->u.dst); | |
2040 | else | |
2041 | xfrm_pols_put(pols, num_pols); | |
2042 | return ERR_PTR(err); | |
2043 | } | |
1da177e4 | 2044 | |
2774c131 DM |
2045 | static struct dst_entry *make_blackhole(struct net *net, u16 family, |
2046 | struct dst_entry *dst_orig) | |
2047 | { | |
2048 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
2049 | struct dst_entry *ret; | |
2050 | ||
2051 | if (!afinfo) { | |
2052 | dst_release(dst_orig); | |
433a1954 | 2053 | return ERR_PTR(-EINVAL); |
2774c131 DM |
2054 | } else { |
2055 | ret = afinfo->blackhole_route(net, dst_orig); | |
2056 | } | |
2057 | xfrm_policy_put_afinfo(afinfo); | |
2058 | ||
2059 | return ret; | |
2060 | } | |
2061 | ||
1da177e4 LT |
2062 | /* Main function: finds/creates a bundle for given flow. |
2063 | * | |
2064 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
2065 | * on interfaces with disabled IPsec. | |
2066 | */ | |
452edd59 DM |
2067 | struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, |
2068 | const struct flowi *fl, | |
2069 | struct sock *sk, int flags) | |
1da177e4 | 2070 | { |
4e81bb83 | 2071 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
80c802f3 TT |
2072 | struct flow_cache_object *flo; |
2073 | struct xfrm_dst *xdst; | |
452edd59 | 2074 | struct dst_entry *dst, *route; |
80c802f3 | 2075 | u16 family = dst_orig->ops->family; |
df71837d | 2076 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
4b021628 | 2077 | int i, err, num_pols, num_xfrms = 0, drop_pols = 0; |
e0d1caa7 | 2078 | |
80c802f3 TT |
2079 | dst = NULL; |
2080 | xdst = NULL; | |
2081 | route = NULL; | |
4e81bb83 | 2082 | |
f7944fb1 | 2083 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
80c802f3 TT |
2084 | num_pols = 1; |
2085 | pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); | |
2086 | err = xfrm_expand_policies(fl, family, pols, | |
2087 | &num_pols, &num_xfrms); | |
2088 | if (err < 0) | |
75b8c133 | 2089 | goto dropdst; |
80c802f3 TT |
2090 | |
2091 | if (num_pols) { | |
2092 | if (num_xfrms <= 0) { | |
2093 | drop_pols = num_pols; | |
2094 | goto no_transform; | |
2095 | } | |
2096 | ||
2097 | xdst = xfrm_resolve_and_create_bundle( | |
2098 | pols, num_pols, fl, | |
2099 | family, dst_orig); | |
2100 | if (IS_ERR(xdst)) { | |
2101 | xfrm_pols_put(pols, num_pols); | |
2102 | err = PTR_ERR(xdst); | |
2103 | goto dropdst; | |
d809ec89 TT |
2104 | } else if (xdst == NULL) { |
2105 | num_xfrms = 0; | |
2106 | drop_pols = num_pols; | |
2107 | goto no_transform; | |
80c802f3 TT |
2108 | } |
2109 | ||
fbd50608 SK |
2110 | dst_hold(&xdst->u.dst); |
2111 | ||
283bc9f3 | 2112 | spin_lock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock); |
80c802f3 TT |
2113 | xdst->u.dst.next = xfrm_policy_sk_bundles; |
2114 | xfrm_policy_sk_bundles = &xdst->u.dst; | |
283bc9f3 | 2115 | spin_unlock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock); |
80c802f3 TT |
2116 | |
2117 | route = xdst->route; | |
0aa64774 | 2118 | } |
3bccfbc7 | 2119 | } |
1da177e4 | 2120 | |
80c802f3 | 2121 | if (xdst == NULL) { |
1da177e4 | 2122 | /* To accelerate a bit... */ |
2518c7c2 | 2123 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 2124 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 2125 | goto nopol; |
1da177e4 | 2126 | |
80c802f3 TT |
2127 | flo = flow_cache_lookup(net, fl, family, dir, |
2128 | xfrm_bundle_lookup, dst_orig); | |
2129 | if (flo == NULL) | |
2130 | goto nopol; | |
fe1a5f03 | 2131 | if (IS_ERR(flo)) { |
80c802f3 | 2132 | err = PTR_ERR(flo); |
75b8c133 | 2133 | goto dropdst; |
d66e37a9 | 2134 | } |
80c802f3 TT |
2135 | xdst = container_of(flo, struct xfrm_dst, flo); |
2136 | ||
2137 | num_pols = xdst->num_pols; | |
2138 | num_xfrms = xdst->num_xfrms; | |
2139 | memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols); | |
2140 | route = xdst->route; | |
2141 | } | |
2142 | ||
2143 | dst = &xdst->u.dst; | |
2144 | if (route == NULL && num_xfrms > 0) { | |
2145 | /* The only case when xfrm_bundle_lookup() returns a | |
2146 | * bundle with null route, is when the template could | |
2147 | * not be resolved. It means policies are there, but | |
2148 | * bundle could not be created, since we don't yet | |
2149 | * have the xfrm_state's. We need to wait for KM to | |
2150 | * negotiate new SA's or bail out with error.*/ | |
2151 | if (net->xfrm.sysctl_larval_drop) { | |
80c802f3 | 2152 | dst_release(dst); |
a1aa3483 | 2153 | xfrm_pols_put(pols, drop_pols); |
80c802f3 | 2154 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
2774c131 | 2155 | |
452edd59 | 2156 | return make_blackhole(net, family, dst_orig); |
80c802f3 | 2157 | } |
80c802f3 | 2158 | |
5b8ef341 | 2159 | err = -EAGAIN; |
80c802f3 TT |
2160 | |
2161 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); | |
2162 | goto error; | |
1da177e4 LT |
2163 | } |
2164 | ||
80c802f3 TT |
2165 | no_transform: |
2166 | if (num_pols == 0) | |
8b7817f3 | 2167 | goto nopol; |
1da177e4 | 2168 | |
80c802f3 TT |
2169 | if ((flags & XFRM_LOOKUP_ICMP) && |
2170 | !(pols[0]->flags & XFRM_POLICY_ICMP)) { | |
2171 | err = -ENOENT; | |
8b7817f3 | 2172 | goto error; |
80c802f3 | 2173 | } |
8b7817f3 | 2174 | |
80c802f3 TT |
2175 | for (i = 0; i < num_pols; i++) |
2176 | pols[i]->curlft.use_time = get_seconds(); | |
8b7817f3 | 2177 | |
80c802f3 | 2178 | if (num_xfrms < 0) { |
1da177e4 | 2179 | /* Prohibit the flow */ |
59c9940e | 2180 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
2181 | err = -EPERM; |
2182 | goto error; | |
80c802f3 TT |
2183 | } else if (num_xfrms > 0) { |
2184 | /* Flow transformed */ | |
80c802f3 TT |
2185 | dst_release(dst_orig); |
2186 | } else { | |
2187 | /* Flow passes untransformed */ | |
2188 | dst_release(dst); | |
452edd59 | 2189 | dst = dst_orig; |
1da177e4 | 2190 | } |
80c802f3 TT |
2191 | ok: |
2192 | xfrm_pols_put(pols, drop_pols); | |
0c183379 G |
2193 | if (dst && dst->xfrm && |
2194 | dst->xfrm->props.mode == XFRM_MODE_TUNNEL) | |
2195 | dst->flags |= DST_XFRM_TUNNEL; | |
452edd59 | 2196 | return dst; |
1da177e4 | 2197 | |
80c802f3 | 2198 | nopol: |
452edd59 DM |
2199 | if (!(flags & XFRM_LOOKUP_ICMP)) { |
2200 | dst = dst_orig; | |
80c802f3 | 2201 | goto ok; |
452edd59 | 2202 | } |
80c802f3 | 2203 | err = -ENOENT; |
1da177e4 | 2204 | error: |
80c802f3 | 2205 | dst_release(dst); |
75b8c133 HX |
2206 | dropdst: |
2207 | dst_release(dst_orig); | |
80c802f3 | 2208 | xfrm_pols_put(pols, drop_pols); |
452edd59 | 2209 | return ERR_PTR(err); |
1da177e4 LT |
2210 | } |
2211 | EXPORT_SYMBOL(xfrm_lookup); | |
2212 | ||
df0ba92a | 2213 | static inline int |
8f029de2 | 2214 | xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl) |
df0ba92a MN |
2215 | { |
2216 | struct xfrm_state *x; | |
df0ba92a MN |
2217 | |
2218 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
2219 | return 0; | |
2220 | x = skb->sp->xvec[idx]; | |
2221 | if (!x->type->reject) | |
2222 | return 0; | |
1ecafede | 2223 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
2224 | } |
2225 | ||
1da177e4 LT |
2226 | /* When skb is transformed back to its "native" form, we have to |
2227 | * check policy restrictions. At the moment we make this in maximally | |
2228 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
2229 | * have policy cached at them. | |
2230 | */ | |
2231 | ||
2232 | static inline int | |
7db454b9 | 2233 | xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, |
1da177e4 LT |
2234 | unsigned short family) |
2235 | { | |
2236 | if (xfrm_state_kern(x)) | |
928ba416 | 2237 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
2238 | return x->id.proto == tmpl->id.proto && |
2239 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
2240 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
2241 | x->props.mode == tmpl->mode && | |
c5d18e98 | 2242 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 2243 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
2244 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
2245 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
2246 | } |
2247 | ||
df0ba92a MN |
2248 | /* |
2249 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
2250 | * because of optional transport mode, or next index of the mathced secpath | |
2251 | * state with the template. | |
2252 | * -1 is returned when no matching template is found. | |
2253 | * Otherwise "-2 - errored_index" is returned. | |
2254 | */ | |
1da177e4 | 2255 | static inline int |
22cccb7e | 2256 | xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start, |
1da177e4 LT |
2257 | unsigned short family) |
2258 | { | |
2259 | int idx = start; | |
2260 | ||
2261 | if (tmpl->optional) { | |
7e49e6de | 2262 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
2263 | return start; |
2264 | } else | |
2265 | start = -1; | |
2266 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 2267 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 2268 | return ++idx; |
df0ba92a MN |
2269 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
2270 | if (start == -1) | |
2271 | start = -2-idx; | |
1da177e4 | 2272 | break; |
df0ba92a | 2273 | } |
1da177e4 LT |
2274 | } |
2275 | return start; | |
2276 | } | |
2277 | ||
d5422efe HX |
2278 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
2279 | unsigned int family, int reverse) | |
1da177e4 LT |
2280 | { |
2281 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 2282 | int err; |
1da177e4 LT |
2283 | |
2284 | if (unlikely(afinfo == NULL)) | |
2285 | return -EAFNOSUPPORT; | |
2286 | ||
d5422efe | 2287 | afinfo->decode_session(skb, fl, reverse); |
1d28f42c | 2288 | err = security_xfrm_decode_session(skb, &fl->flowi_secid); |
1da177e4 | 2289 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 2290 | return err; |
1da177e4 | 2291 | } |
d5422efe | 2292 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 2293 | |
9a7386ec | 2294 | static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
2295 | { |
2296 | for (; k < sp->len; k++) { | |
df0ba92a | 2297 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 2298 | *idxp = k; |
1da177e4 | 2299 | return 1; |
df0ba92a | 2300 | } |
1da177e4 LT |
2301 | } |
2302 | ||
2303 | return 0; | |
2304 | } | |
2305 | ||
a716c119 | 2306 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
2307 | unsigned short family) |
2308 | { | |
f6e1e25d | 2309 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2310 | struct xfrm_policy *pol; |
4e81bb83 MN |
2311 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2312 | int npols = 0; | |
2313 | int xfrm_nr; | |
2314 | int pi; | |
d5422efe | 2315 | int reverse; |
1da177e4 | 2316 | struct flowi fl; |
d5422efe | 2317 | u8 fl_dir; |
df0ba92a | 2318 | int xerr_idx = -1; |
1da177e4 | 2319 | |
d5422efe HX |
2320 | reverse = dir & ~XFRM_POLICY_MASK; |
2321 | dir &= XFRM_POLICY_MASK; | |
2322 | fl_dir = policy_to_flow_dir(dir); | |
2323 | ||
0aa64774 | 2324 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 2325 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 2326 | return 0; |
0aa64774 MN |
2327 | } |
2328 | ||
eb9c7ebe | 2329 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
2330 | |
2331 | /* First, check used SA against their selectors. */ | |
2332 | if (skb->sp) { | |
2333 | int i; | |
2334 | ||
2335 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 2336 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 2337 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 2338 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 2339 | return 0; |
0aa64774 | 2340 | } |
1da177e4 LT |
2341 | } |
2342 | } | |
2343 | ||
2344 | pol = NULL; | |
3bccfbc7 | 2345 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 2346 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 2347 | if (IS_ERR(pol)) { |
59c9940e | 2348 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 2349 | return 0; |
0aa64774 | 2350 | } |
3bccfbc7 | 2351 | } |
1da177e4 | 2352 | |
fe1a5f03 TT |
2353 | if (!pol) { |
2354 | struct flow_cache_object *flo; | |
2355 | ||
2356 | flo = flow_cache_lookup(net, &fl, family, fl_dir, | |
2357 | xfrm_policy_lookup, NULL); | |
2358 | if (IS_ERR_OR_NULL(flo)) | |
2359 | pol = ERR_CAST(flo); | |
2360 | else | |
2361 | pol = container_of(flo, struct xfrm_policy, flo); | |
2362 | } | |
1da177e4 | 2363 | |
0aa64774 | 2364 | if (IS_ERR(pol)) { |
59c9940e | 2365 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2366 | return 0; |
0aa64774 | 2367 | } |
134b0fc5 | 2368 | |
df0ba92a | 2369 | if (!pol) { |
d1d9facf | 2370 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 2371 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 2372 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
2373 | return 0; |
2374 | } | |
2375 | return 1; | |
2376 | } | |
1da177e4 | 2377 | |
9d729f72 | 2378 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 2379 | |
4e81bb83 MN |
2380 | pols[0] = pol; |
2381 | npols ++; | |
2382 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2383 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 2384 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
2385 | &fl, family, |
2386 | XFRM_POLICY_IN); | |
2387 | if (pols[1]) { | |
0aa64774 | 2388 | if (IS_ERR(pols[1])) { |
59c9940e | 2389 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2390 | return 0; |
0aa64774 | 2391 | } |
9d729f72 | 2392 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
2393 | npols ++; |
2394 | } | |
2395 | } | |
2396 | #endif | |
2397 | ||
1da177e4 LT |
2398 | if (pol->action == XFRM_POLICY_ALLOW) { |
2399 | struct sec_path *sp; | |
2400 | static struct sec_path dummy; | |
4e81bb83 | 2401 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 2402 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
2403 | struct xfrm_tmpl **tpp = tp; |
2404 | int ti = 0; | |
1da177e4 LT |
2405 | int i, k; |
2406 | ||
2407 | if ((sp = skb->sp) == NULL) | |
2408 | sp = &dummy; | |
2409 | ||
4e81bb83 MN |
2410 | for (pi = 0; pi < npols; pi++) { |
2411 | if (pols[pi] != pol && | |
0aa64774 | 2412 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 2413 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 2414 | goto reject; |
0aa64774 MN |
2415 | } |
2416 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 2417 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 2418 | goto reject_error; |
0aa64774 | 2419 | } |
4e81bb83 MN |
2420 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2421 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2422 | } | |
2423 | xfrm_nr = ti; | |
41a49cc3 | 2424 | if (npols > 1) { |
283bc9f3 | 2425 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net); |
41a49cc3 MN |
2426 | tpp = stp; |
2427 | } | |
4e81bb83 | 2428 | |
1da177e4 LT |
2429 | /* For each tunnel xfrm, find the first matching tmpl. |
2430 | * For each tmpl before that, find corresponding xfrm. | |
2431 | * Order is _important_. Later we will implement | |
2432 | * some barriers, but at the moment barriers | |
2433 | * are implied between each two transformations. | |
2434 | */ | |
4e81bb83 MN |
2435 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2436 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2437 | if (k < 0) { |
d1d9facf JM |
2438 | if (k < -1) |
2439 | /* "-2 - errored_index" returned */ | |
2440 | xerr_idx = -(2+k); | |
59c9940e | 2441 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2442 | goto reject; |
df0ba92a | 2443 | } |
1da177e4 LT |
2444 | } |
2445 | ||
0aa64774 | 2446 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2447 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2448 | goto reject; |
0aa64774 | 2449 | } |
1da177e4 | 2450 | |
4e81bb83 | 2451 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2452 | return 1; |
2453 | } | |
59c9940e | 2454 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2455 | |
2456 | reject: | |
df0ba92a | 2457 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2458 | reject_error: |
2459 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2460 | return 0; |
2461 | } | |
2462 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2463 | ||
2464 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2465 | { | |
99a66657 | 2466 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2467 | struct flowi fl; |
adf30907 | 2468 | struct dst_entry *dst; |
73137147 | 2469 | int res = 1; |
1da177e4 | 2470 | |
0aa64774 | 2471 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
72032fdb | 2472 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
1da177e4 | 2473 | return 0; |
0aa64774 | 2474 | } |
1da177e4 | 2475 | |
fafeeb6c | 2476 | skb_dst_force(skb); |
adf30907 | 2477 | |
452edd59 DM |
2478 | dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, 0); |
2479 | if (IS_ERR(dst)) { | |
73137147 | 2480 | res = 0; |
452edd59 DM |
2481 | dst = NULL; |
2482 | } | |
adf30907 ED |
2483 | skb_dst_set(skb, dst); |
2484 | return res; | |
1da177e4 LT |
2485 | } |
2486 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2487 | ||
d49c73c7 DM |
2488 | /* Optimize later using cookies and generation ids. */ |
2489 | ||
1da177e4 LT |
2490 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2491 | { | |
d49c73c7 | 2492 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
f5b0a874 DM |
2493 | * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to |
2494 | * get validated by dst_ops->check on every use. We do this | |
2495 | * because when a normal route referenced by an XFRM dst is | |
2496 | * obsoleted we do not go looking around for all parent | |
2497 | * referencing XFRM dsts so that we can invalidate them. It | |
2498 | * is just too much work. Instead we make the checks here on | |
2499 | * every use. For example: | |
d49c73c7 DM |
2500 | * |
2501 | * XFRM dst A --> IPv4 dst X | |
2502 | * | |
2503 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2504 | * in this example). If X is marked obsolete, "A" will not | |
2505 | * notice. That's what we are validating here via the | |
2506 | * stale_bundle() check. | |
2507 | * | |
2508 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
f5b0a874 DM |
2509 | * dst which causes it's ->obsolete field to be set to |
2510 | * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like | |
2511 | * this, we want to force a new route lookup. | |
399c180a | 2512 | */ |
d49c73c7 DM |
2513 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2514 | return dst; | |
2515 | ||
1da177e4 LT |
2516 | return NULL; |
2517 | } | |
2518 | ||
2519 | static int stale_bundle(struct dst_entry *dst) | |
2520 | { | |
12fdb4d3 | 2521 | return !xfrm_bundle_ok((struct xfrm_dst *)dst); |
1da177e4 LT |
2522 | } |
2523 | ||
aabc9761 | 2524 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2525 | { |
1da177e4 | 2526 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2527 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2528 | dev_hold(dst->dev); |
1da177e4 LT |
2529 | dev_put(dev); |
2530 | } | |
2531 | } | |
aabc9761 | 2532 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2533 | |
2534 | static void xfrm_link_failure(struct sk_buff *skb) | |
2535 | { | |
2536 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1da177e4 LT |
2537 | } |
2538 | ||
2539 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2540 | { | |
2541 | if (dst) { | |
2542 | if (dst->obsolete) { | |
2543 | dst_release(dst); | |
2544 | dst = NULL; | |
2545 | } | |
2546 | } | |
2547 | return dst; | |
2548 | } | |
2549 | ||
80c802f3 | 2550 | static void __xfrm_garbage_collect(struct net *net) |
1da177e4 | 2551 | { |
80c802f3 | 2552 | struct dst_entry *head, *next; |
1da177e4 | 2553 | |
283bc9f3 | 2554 | spin_lock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock); |
80c802f3 TT |
2555 | head = xfrm_policy_sk_bundles; |
2556 | xfrm_policy_sk_bundles = NULL; | |
283bc9f3 | 2557 | spin_unlock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock); |
2518c7c2 | 2558 | |
80c802f3 TT |
2559 | while (head) { |
2560 | next = head->next; | |
2561 | dst_free(head); | |
2562 | head = next; | |
1da177e4 LT |
2563 | } |
2564 | } | |
2565 | ||
e4c17216 | 2566 | void xfrm_garbage_collect(struct net *net) |
c0ed1c14 SK |
2567 | { |
2568 | flow_cache_flush(); | |
2569 | __xfrm_garbage_collect(net); | |
2570 | } | |
e4c17216 | 2571 | EXPORT_SYMBOL(xfrm_garbage_collect); |
c0ed1c14 SK |
2572 | |
2573 | static void xfrm_garbage_collect_deferred(struct net *net) | |
2574 | { | |
2575 | flow_cache_flush_deferred(); | |
2576 | __xfrm_garbage_collect(net); | |
2577 | } | |
2578 | ||
25ee3286 | 2579 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2580 | { |
2581 | do { | |
2582 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2583 | u32 pmtu, route_mtu_cached; | |
2584 | ||
2585 | pmtu = dst_mtu(dst->child); | |
2586 | xdst->child_mtu_cached = pmtu; | |
2587 | ||
2588 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2589 | ||
2590 | route_mtu_cached = dst_mtu(xdst->route); | |
2591 | xdst->route_mtu_cached = route_mtu_cached; | |
2592 | ||
2593 | if (pmtu > route_mtu_cached) | |
2594 | pmtu = route_mtu_cached; | |
2595 | ||
defb3519 | 2596 | dst_metric_set(dst, RTAX_MTU, pmtu); |
1da177e4 LT |
2597 | } while ((dst = dst->next)); |
2598 | } | |
2599 | ||
1da177e4 LT |
2600 | /* Check that the bundle accepts the flow and its components are |
2601 | * still valid. | |
2602 | */ | |
2603 | ||
12fdb4d3 | 2604 | static int xfrm_bundle_ok(struct xfrm_dst *first) |
1da177e4 LT |
2605 | { |
2606 | struct dst_entry *dst = &first->u.dst; | |
2607 | struct xfrm_dst *last; | |
2608 | u32 mtu; | |
2609 | ||
92d63dec | 2610 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2611 | (dst->dev && !netif_running(dst->dev))) |
2612 | return 0; | |
2613 | ||
a0073fe1 SK |
2614 | if (dst->flags & DST_XFRM_QUEUE) |
2615 | return 1; | |
2616 | ||
1da177e4 LT |
2617 | last = NULL; |
2618 | ||
2619 | do { | |
2620 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2621 | ||
1da177e4 LT |
2622 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2623 | return 0; | |
80c802f3 TT |
2624 | if (xdst->xfrm_genid != dst->xfrm->genid) |
2625 | return 0; | |
b1312c89 TT |
2626 | if (xdst->num_pols > 0 && |
2627 | xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) | |
9d4a706d | 2628 | return 0; |
e53820de | 2629 | |
1da177e4 LT |
2630 | mtu = dst_mtu(dst->child); |
2631 | if (xdst->child_mtu_cached != mtu) { | |
2632 | last = xdst; | |
2633 | xdst->child_mtu_cached = mtu; | |
2634 | } | |
2635 | ||
92d63dec | 2636 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2637 | return 0; |
2638 | mtu = dst_mtu(xdst->route); | |
2639 | if (xdst->route_mtu_cached != mtu) { | |
2640 | last = xdst; | |
2641 | xdst->route_mtu_cached = mtu; | |
2642 | } | |
2643 | ||
2644 | dst = dst->child; | |
2645 | } while (dst->xfrm); | |
2646 | ||
2647 | if (likely(!last)) | |
2648 | return 1; | |
2649 | ||
2650 | mtu = last->child_mtu_cached; | |
2651 | for (;;) { | |
2652 | dst = &last->u.dst; | |
2653 | ||
2654 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2655 | if (mtu > last->route_mtu_cached) | |
2656 | mtu = last->route_mtu_cached; | |
defb3519 | 2657 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
2658 | |
2659 | if (last == first) | |
2660 | break; | |
2661 | ||
bd0bf076 | 2662 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2663 | last->child_mtu_cached = mtu; |
2664 | } | |
2665 | ||
2666 | return 1; | |
2667 | } | |
2668 | ||
0dbaee3b DM |
2669 | static unsigned int xfrm_default_advmss(const struct dst_entry *dst) |
2670 | { | |
2671 | return dst_metric_advmss(dst->path); | |
2672 | } | |
2673 | ||
ebb762f2 | 2674 | static unsigned int xfrm_mtu(const struct dst_entry *dst) |
d33e4553 | 2675 | { |
618f9bc7 SK |
2676 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2677 | ||
2678 | return mtu ? : dst_mtu(dst->path); | |
d33e4553 DM |
2679 | } |
2680 | ||
f894cbf8 DM |
2681 | static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, |
2682 | struct sk_buff *skb, | |
2683 | const void *daddr) | |
d3aaeb38 | 2684 | { |
f894cbf8 | 2685 | return dst->path->ops->neigh_lookup(dst, skb, daddr); |
d3aaeb38 DM |
2686 | } |
2687 | ||
1da177e4 LT |
2688 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2689 | { | |
d7c7544c | 2690 | struct net *net; |
1da177e4 LT |
2691 | int err = 0; |
2692 | if (unlikely(afinfo == NULL)) | |
2693 | return -EINVAL; | |
2694 | if (unlikely(afinfo->family >= NPROTO)) | |
2695 | return -EAFNOSUPPORT; | |
ef8531b6 | 2696 | spin_lock(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2697 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2698 | err = -ENOBUFS; | |
2699 | else { | |
2700 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2701 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2702 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2703 | if (likely(dst_ops->check == NULL)) | |
2704 | dst_ops->check = xfrm_dst_check; | |
0dbaee3b DM |
2705 | if (likely(dst_ops->default_advmss == NULL)) |
2706 | dst_ops->default_advmss = xfrm_default_advmss; | |
ebb762f2 SK |
2707 | if (likely(dst_ops->mtu == NULL)) |
2708 | dst_ops->mtu = xfrm_mtu; | |
1da177e4 LT |
2709 | if (likely(dst_ops->negative_advice == NULL)) |
2710 | dst_ops->negative_advice = xfrm_negative_advice; | |
2711 | if (likely(dst_ops->link_failure == NULL)) | |
2712 | dst_ops->link_failure = xfrm_link_failure; | |
d3aaeb38 DM |
2713 | if (likely(dst_ops->neigh_lookup == NULL)) |
2714 | dst_ops->neigh_lookup = xfrm_neigh_lookup; | |
1da177e4 | 2715 | if (likely(afinfo->garbage_collect == NULL)) |
c0ed1c14 | 2716 | afinfo->garbage_collect = xfrm_garbage_collect_deferred; |
418a99ac | 2717 | rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo); |
1da177e4 | 2718 | } |
ef8531b6 | 2719 | spin_unlock(&xfrm_policy_afinfo_lock); |
d7c7544c AD |
2720 | |
2721 | rtnl_lock(); | |
2722 | for_each_net(net) { | |
2723 | struct dst_ops *xfrm_dst_ops; | |
2724 | ||
2725 | switch (afinfo->family) { | |
2726 | case AF_INET: | |
2727 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; | |
2728 | break; | |
dfd56b8b | 2729 | #if IS_ENABLED(CONFIG_IPV6) |
d7c7544c AD |
2730 | case AF_INET6: |
2731 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; | |
2732 | break; | |
2733 | #endif | |
2734 | default: | |
2735 | BUG(); | |
2736 | } | |
2737 | *xfrm_dst_ops = *afinfo->dst_ops; | |
2738 | } | |
2739 | rtnl_unlock(); | |
2740 | ||
1da177e4 LT |
2741 | return err; |
2742 | } | |
2743 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2744 | ||
2745 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2746 | { | |
2747 | int err = 0; | |
2748 | if (unlikely(afinfo == NULL)) | |
2749 | return -EINVAL; | |
2750 | if (unlikely(afinfo->family >= NPROTO)) | |
2751 | return -EAFNOSUPPORT; | |
ef8531b6 | 2752 | spin_lock(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2753 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2754 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2755 | err = -EINVAL; | |
ef8531b6 ED |
2756 | else |
2757 | RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family], | |
2758 | NULL); | |
2759 | } | |
2760 | spin_unlock(&xfrm_policy_afinfo_lock); | |
2761 | if (!err) { | |
2762 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2763 | ||
2764 | synchronize_rcu(); | |
2765 | ||
2766 | dst_ops->kmem_cachep = NULL; | |
2767 | dst_ops->check = NULL; | |
2768 | dst_ops->negative_advice = NULL; | |
2769 | dst_ops->link_failure = NULL; | |
2770 | afinfo->garbage_collect = NULL; | |
1da177e4 | 2771 | } |
1da177e4 LT |
2772 | return err; |
2773 | } | |
2774 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2775 | ||
d7c7544c AD |
2776 | static void __net_init xfrm_dst_ops_init(struct net *net) |
2777 | { | |
2778 | struct xfrm_policy_afinfo *afinfo; | |
2779 | ||
ef8531b6 ED |
2780 | rcu_read_lock(); |
2781 | afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]); | |
d7c7544c AD |
2782 | if (afinfo) |
2783 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; | |
dfd56b8b | 2784 | #if IS_ENABLED(CONFIG_IPV6) |
ef8531b6 | 2785 | afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]); |
d7c7544c AD |
2786 | if (afinfo) |
2787 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; | |
2788 | #endif | |
418a99ac | 2789 | rcu_read_unlock(); |
546be240 HX |
2790 | } |
2791 | ||
1da177e4 LT |
2792 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2793 | { | |
351638e7 | 2794 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
e9dc8653 | 2795 | |
1da177e4 LT |
2796 | switch (event) { |
2797 | case NETDEV_DOWN: | |
c0ed1c14 | 2798 | xfrm_garbage_collect(dev_net(dev)); |
1da177e4 LT |
2799 | } |
2800 | return NOTIFY_DONE; | |
2801 | } | |
2802 | ||
2803 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2804 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2805 | }; |
2806 | ||
558f82ef | 2807 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2808 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2809 | { |
c68cd1a0 AD |
2810 | int rv; |
2811 | ||
7d720c3e | 2812 | if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics, |
1823e4c8 ED |
2813 | sizeof(struct linux_xfrm_mib), |
2814 | __alignof__(struct linux_xfrm_mib)) < 0) | |
558f82ef | 2815 | return -ENOMEM; |
c68cd1a0 AD |
2816 | rv = xfrm_proc_init(net); |
2817 | if (rv < 0) | |
7d720c3e | 2818 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
c68cd1a0 | 2819 | return rv; |
558f82ef | 2820 | } |
59c9940e AD |
2821 | |
2822 | static void xfrm_statistics_fini(struct net *net) | |
2823 | { | |
c68cd1a0 | 2824 | xfrm_proc_fini(net); |
7d720c3e | 2825 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
59c9940e AD |
2826 | } |
2827 | #else | |
2828 | static int __net_init xfrm_statistics_init(struct net *net) | |
2829 | { | |
2830 | return 0; | |
2831 | } | |
2832 | ||
2833 | static void xfrm_statistics_fini(struct net *net) | |
2834 | { | |
2835 | } | |
558f82ef MN |
2836 | #endif |
2837 | ||
d62ddc21 | 2838 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2839 | { |
2518c7c2 DM |
2840 | unsigned int hmask, sz; |
2841 | int dir; | |
2842 | ||
d62ddc21 AD |
2843 | if (net_eq(net, &init_net)) |
2844 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2845 | sizeof(struct xfrm_dst), |
e5d679f3 | 2846 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2847 | NULL); |
1da177e4 | 2848 | |
2518c7c2 DM |
2849 | hmask = 8 - 1; |
2850 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2851 | ||
93b851c1 AD |
2852 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2853 | if (!net->xfrm.policy_byidx) | |
2854 | goto out_byidx; | |
8100bea7 | 2855 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 DM |
2856 | |
2857 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2858 | struct xfrm_policy_hash *htab; | |
2859 | ||
dc2caba7 | 2860 | net->xfrm.policy_count[dir] = 0; |
8b18f8ea | 2861 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2862 | |
a35f6c5d | 2863 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2864 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2865 | if (!htab->table) |
a35f6c5d AD |
2866 | goto out_bydst; |
2867 | htab->hmask = hmask; | |
2518c7c2 DM |
2868 | } |
2869 | ||
adfcf0b2 | 2870 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2871 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
d62ddc21 AD |
2872 | if (net_eq(net, &init_net)) |
2873 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2874 | return 0; | |
93b851c1 | 2875 | |
a35f6c5d AD |
2876 | out_bydst: |
2877 | for (dir--; dir >= 0; dir--) { | |
2878 | struct xfrm_policy_hash *htab; | |
2879 | ||
2880 | htab = &net->xfrm.policy_bydst[dir]; | |
2881 | xfrm_hash_free(htab->table, sz); | |
2882 | } | |
2883 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
2884 | out_byidx: |
2885 | return -ENOMEM; | |
d62ddc21 AD |
2886 | } |
2887 | ||
2888 | static void xfrm_policy_fini(struct net *net) | |
2889 | { | |
7c2776ee | 2890 | struct xfrm_audit audit_info; |
93b851c1 | 2891 | unsigned int sz; |
8b18f8ea | 2892 | int dir; |
93b851c1 | 2893 | |
7c2776ee AD |
2894 | flush_work(&net->xfrm.policy_hash_work); |
2895 | #ifdef CONFIG_XFRM_SUB_POLICY | |
e1760bd5 | 2896 | audit_info.loginuid = INVALID_UID; |
7c2776ee AD |
2897 | audit_info.sessionid = -1; |
2898 | audit_info.secid = 0; | |
2899 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); | |
2900 | #endif | |
e1760bd5 | 2901 | audit_info.loginuid = INVALID_UID; |
7c2776ee AD |
2902 | audit_info.sessionid = -1; |
2903 | audit_info.secid = 0; | |
2904 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); | |
7c2776ee | 2905 | |
adfcf0b2 | 2906 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2907 | |
8b18f8ea | 2908 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
a35f6c5d AD |
2909 | struct xfrm_policy_hash *htab; |
2910 | ||
8b18f8ea | 2911 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
2912 | |
2913 | htab = &net->xfrm.policy_bydst[dir]; | |
5b653b2a | 2914 | sz = (htab->hmask + 1) * sizeof(struct hlist_head); |
a35f6c5d AD |
2915 | WARN_ON(!hlist_empty(htab->table)); |
2916 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
2917 | } |
2918 | ||
8100bea7 | 2919 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2920 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2921 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2922 | } |
2923 | ||
d62ddc21 AD |
2924 | static int __net_init xfrm_net_init(struct net *net) |
2925 | { | |
2926 | int rv; | |
2927 | ||
59c9940e AD |
2928 | rv = xfrm_statistics_init(net); |
2929 | if (rv < 0) | |
2930 | goto out_statistics; | |
d62ddc21 AD |
2931 | rv = xfrm_state_init(net); |
2932 | if (rv < 0) | |
2933 | goto out_state; | |
2934 | rv = xfrm_policy_init(net); | |
2935 | if (rv < 0) | |
2936 | goto out_policy; | |
d7c7544c | 2937 | xfrm_dst_ops_init(net); |
b27aeadb AD |
2938 | rv = xfrm_sysctl_init(net); |
2939 | if (rv < 0) | |
2940 | goto out_sysctl; | |
283bc9f3 FD |
2941 | |
2942 | /* Initialize the per-net locks here */ | |
2943 | spin_lock_init(&net->xfrm.xfrm_state_lock); | |
2944 | rwlock_init(&net->xfrm.xfrm_policy_lock); | |
2945 | spin_lock_init(&net->xfrm.xfrm_policy_sk_bundle_lock); | |
2946 | mutex_init(&net->xfrm.xfrm_cfg_mutex); | |
2947 | ||
d62ddc21 AD |
2948 | return 0; |
2949 | ||
b27aeadb AD |
2950 | out_sysctl: |
2951 | xfrm_policy_fini(net); | |
d62ddc21 AD |
2952 | out_policy: |
2953 | xfrm_state_fini(net); | |
2954 | out_state: | |
59c9940e AD |
2955 | xfrm_statistics_fini(net); |
2956 | out_statistics: | |
d62ddc21 AD |
2957 | return rv; |
2958 | } | |
2959 | ||
2960 | static void __net_exit xfrm_net_exit(struct net *net) | |
2961 | { | |
b27aeadb | 2962 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
2963 | xfrm_policy_fini(net); |
2964 | xfrm_state_fini(net); | |
59c9940e | 2965 | xfrm_statistics_fini(net); |
d62ddc21 AD |
2966 | } |
2967 | ||
2968 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2969 | .init = xfrm_net_init, | |
2970 | .exit = xfrm_net_exit, | |
2971 | }; | |
2972 | ||
1da177e4 LT |
2973 | void __init xfrm_init(void) |
2974 | { | |
d62ddc21 | 2975 | register_pernet_subsys(&xfrm_net_ops); |
1da177e4 LT |
2976 | xfrm_input_init(); |
2977 | } | |
2978 | ||
ab5f5e8b | 2979 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2980 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2981 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2982 | { |
875179fa PM |
2983 | struct xfrm_sec_ctx *ctx = xp->security; |
2984 | struct xfrm_selector *sel = &xp->selector; | |
2985 | ||
2986 | if (ctx) | |
ab5f5e8b | 2987 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2988 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2989 | |
875179fa | 2990 | switch(sel->family) { |
ab5f5e8b | 2991 | case AF_INET: |
21454aaa | 2992 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2993 | if (sel->prefixlen_s != 32) |
2994 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2995 | sel->prefixlen_s); | |
21454aaa | 2996 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2997 | if (sel->prefixlen_d != 32) |
2998 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2999 | sel->prefixlen_d); | |
ab5f5e8b JL |
3000 | break; |
3001 | case AF_INET6: | |
5b095d98 | 3002 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
3003 | if (sel->prefixlen_s != 128) |
3004 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
3005 | sel->prefixlen_s); | |
5b095d98 | 3006 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
3007 | if (sel->prefixlen_d != 128) |
3008 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
3009 | sel->prefixlen_d); | |
ab5f5e8b JL |
3010 | break; |
3011 | } | |
3012 | } | |
3013 | ||
68277acc | 3014 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
e1760bd5 | 3015 | kuid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
3016 | { |
3017 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 3018 | |
afeb14b4 | 3019 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
3020 | if (audit_buf == NULL) |
3021 | return; | |
2532386f | 3022 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 3023 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
3024 | xfrm_audit_common_policyinfo(xp, audit_buf); |
3025 | audit_log_end(audit_buf); | |
3026 | } | |
3027 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
3028 | ||
68277acc | 3029 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
e1760bd5 | 3030 | kuid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
3031 | { |
3032 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 3033 | |
afeb14b4 | 3034 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
3035 | if (audit_buf == NULL) |
3036 | return; | |
2532386f | 3037 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 3038 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
3039 | xfrm_audit_common_policyinfo(xp, audit_buf); |
3040 | audit_log_end(audit_buf); | |
3041 | } | |
3042 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
3043 | #endif | |
3044 | ||
80c9abaa | 3045 | #ifdef CONFIG_XFRM_MIGRATE |
bc9b35ad DM |
3046 | static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp, |
3047 | const struct xfrm_selector *sel_tgt) | |
80c9abaa SS |
3048 | { |
3049 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
3050 | if (sel_tgt->family == sel_cmp->family && | |
70e94e66 YH |
3051 | xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr, |
3052 | sel_cmp->family) && | |
3053 | xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr, | |
3054 | sel_cmp->family) && | |
80c9abaa SS |
3055 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && |
3056 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
bc9b35ad | 3057 | return true; |
80c9abaa SS |
3058 | } |
3059 | } else { | |
3060 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
bc9b35ad | 3061 | return true; |
80c9abaa SS |
3062 | } |
3063 | } | |
bc9b35ad | 3064 | return false; |
80c9abaa SS |
3065 | } |
3066 | ||
b4b7c0b3 | 3067 | static struct xfrm_policy * xfrm_migrate_policy_find(const struct xfrm_selector *sel, |
8d549c4f | 3068 | u8 dir, u8 type, struct net *net) |
80c9abaa SS |
3069 | { |
3070 | struct xfrm_policy *pol, *ret = NULL; | |
80c9abaa SS |
3071 | struct hlist_head *chain; |
3072 | u32 priority = ~0U; | |
3073 | ||
283bc9f3 | 3074 | read_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME*/ |
8d549c4f | 3075 | chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir); |
b67bfe0d | 3076 | hlist_for_each_entry(pol, chain, bydst) { |
80c9abaa SS |
3077 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
3078 | pol->type == type) { | |
3079 | ret = pol; | |
3080 | priority = ret->priority; | |
3081 | break; | |
3082 | } | |
3083 | } | |
8d549c4f | 3084 | chain = &net->xfrm.policy_inexact[dir]; |
b67bfe0d | 3085 | hlist_for_each_entry(pol, chain, bydst) { |
80c9abaa SS |
3086 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
3087 | pol->type == type && | |
3088 | pol->priority < priority) { | |
3089 | ret = pol; | |
3090 | break; | |
3091 | } | |
3092 | } | |
3093 | ||
3094 | if (ret) | |
3095 | xfrm_pol_hold(ret); | |
3096 | ||
283bc9f3 | 3097 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
80c9abaa SS |
3098 | |
3099 | return ret; | |
3100 | } | |
3101 | ||
dd701754 | 3102 | static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t) |
80c9abaa SS |
3103 | { |
3104 | int match = 0; | |
3105 | ||
3106 | if (t->mode == m->mode && t->id.proto == m->proto && | |
3107 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
3108 | switch (t->mode) { | |
3109 | case XFRM_MODE_TUNNEL: | |
3110 | case XFRM_MODE_BEET: | |
70e94e66 YH |
3111 | if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr, |
3112 | m->old_family) && | |
3113 | xfrm_addr_equal(&t->saddr, &m->old_saddr, | |
3114 | m->old_family)) { | |
80c9abaa SS |
3115 | match = 1; |
3116 | } | |
3117 | break; | |
3118 | case XFRM_MODE_TRANSPORT: | |
3119 | /* in case of transport mode, template does not store | |
3120 | any IP addresses, hence we just compare mode and | |
3121 | protocol */ | |
3122 | match = 1; | |
3123 | break; | |
3124 | default: | |
3125 | break; | |
3126 | } | |
3127 | } | |
3128 | return match; | |
3129 | } | |
3130 | ||
3131 | /* update endpoint address(es) of template(s) */ | |
3132 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
3133 | struct xfrm_migrate *m, int num_migrate) | |
3134 | { | |
3135 | struct xfrm_migrate *mp; | |
80c9abaa SS |
3136 | int i, j, n = 0; |
3137 | ||
3138 | write_lock_bh(&pol->lock); | |
12a169e7 | 3139 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
3140 | /* target policy has been deleted */ |
3141 | write_unlock_bh(&pol->lock); | |
3142 | return -ENOENT; | |
3143 | } | |
3144 | ||
3145 | for (i = 0; i < pol->xfrm_nr; i++) { | |
3146 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
3147 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
3148 | continue; | |
3149 | n++; | |
1bfcb10f HX |
3150 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
3151 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
3152 | continue; |
3153 | /* update endpoints */ | |
3154 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
3155 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
3156 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
3157 | sizeof(pol->xfrm_vec[i].saddr)); | |
3158 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
3159 | /* flush bundles */ | |
80c802f3 | 3160 | atomic_inc(&pol->genid); |
80c9abaa SS |
3161 | } |
3162 | } | |
3163 | ||
3164 | write_unlock_bh(&pol->lock); | |
3165 | ||
3166 | if (!n) | |
3167 | return -ENODATA; | |
3168 | ||
3169 | return 0; | |
3170 | } | |
3171 | ||
dd701754 | 3172 | static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate) |
80c9abaa SS |
3173 | { |
3174 | int i, j; | |
3175 | ||
3176 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
3177 | return -EINVAL; | |
3178 | ||
3179 | for (i = 0; i < num_migrate; i++) { | |
70e94e66 YH |
3180 | if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr, |
3181 | m[i].old_family) && | |
3182 | xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr, | |
3183 | m[i].old_family)) | |
80c9abaa SS |
3184 | return -EINVAL; |
3185 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
3186 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
3187 | return -EINVAL; | |
3188 | ||
3189 | /* check if there is any duplicated entry */ | |
3190 | for (j = i + 1; j < num_migrate; j++) { | |
3191 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
3192 | sizeof(m[i].old_daddr)) && | |
3193 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
3194 | sizeof(m[i].old_saddr)) && | |
3195 | m[i].proto == m[j].proto && | |
3196 | m[i].mode == m[j].mode && | |
3197 | m[i].reqid == m[j].reqid && | |
3198 | m[i].old_family == m[j].old_family) | |
3199 | return -EINVAL; | |
3200 | } | |
3201 | } | |
3202 | ||
3203 | return 0; | |
3204 | } | |
3205 | ||
b4b7c0b3 | 3206 | int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 | 3207 | struct xfrm_migrate *m, int num_migrate, |
8d549c4f | 3208 | struct xfrm_kmaddress *k, struct net *net) |
80c9abaa SS |
3209 | { |
3210 | int i, err, nx_cur = 0, nx_new = 0; | |
3211 | struct xfrm_policy *pol = NULL; | |
3212 | struct xfrm_state *x, *xc; | |
3213 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
3214 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
3215 | struct xfrm_migrate *mp; | |
3216 | ||
3217 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
3218 | goto out; | |
3219 | ||
3220 | /* Stage 1 - find policy */ | |
8d549c4f | 3221 | if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) { |
80c9abaa SS |
3222 | err = -ENOENT; |
3223 | goto out; | |
3224 | } | |
3225 | ||
3226 | /* Stage 2 - find and update state(s) */ | |
3227 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
283bc9f3 | 3228 | if ((x = xfrm_migrate_state_find(mp, net))) { |
80c9abaa SS |
3229 | x_cur[nx_cur] = x; |
3230 | nx_cur++; | |
3231 | if ((xc = xfrm_state_migrate(x, mp))) { | |
3232 | x_new[nx_new] = xc; | |
3233 | nx_new++; | |
3234 | } else { | |
3235 | err = -ENODATA; | |
3236 | goto restore_state; | |
3237 | } | |
3238 | } | |
3239 | } | |
3240 | ||
3241 | /* Stage 3 - update policy */ | |
3242 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
3243 | goto restore_state; | |
3244 | ||
3245 | /* Stage 4 - delete old state(s) */ | |
3246 | if (nx_cur) { | |
3247 | xfrm_states_put(x_cur, nx_cur); | |
3248 | xfrm_states_delete(x_cur, nx_cur); | |
3249 | } | |
3250 | ||
3251 | /* Stage 5 - announce */ | |
13c1d189 | 3252 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
3253 | |
3254 | xfrm_pol_put(pol); | |
3255 | ||
3256 | return 0; | |
3257 | out: | |
3258 | return err; | |
3259 | ||
3260 | restore_state: | |
3261 | if (pol) | |
3262 | xfrm_pol_put(pol); | |
3263 | if (nx_cur) | |
3264 | xfrm_states_put(x_cur, nx_cur); | |
3265 | if (nx_new) | |
3266 | xfrm_states_delete(x_new, nx_new); | |
3267 | ||
3268 | return err; | |
3269 | } | |
e610e679 | 3270 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 3271 | #endif |