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 | ||
418a99ac PJ |
42 | static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock); |
43 | static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO] | |
44 | __read_mostly; | |
1da177e4 | 45 | |
e18b890b | 46 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 | 47 | |
25ee3286 | 48 | static void xfrm_init_pmtu(struct dst_entry *dst); |
80c802f3 | 49 | static int stale_bundle(struct dst_entry *dst); |
12fdb4d3 | 50 | static int xfrm_bundle_ok(struct xfrm_dst *xdst); |
a0073fe1 | 51 | static void xfrm_policy_queue_process(unsigned long arg); |
1da177e4 | 52 | |
29fa0b30 WY |
53 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
54 | int dir); | |
55 | ||
bc9b35ad | 56 | static inline bool |
200ce96e | 57 | __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 58 | { |
7e1dc7b6 DM |
59 | const struct flowi4 *fl4 = &fl->u.ip4; |
60 | ||
26bff940 AD |
61 | return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) && |
62 | addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) && | |
7e1dc7b6 DM |
63 | !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) && |
64 | !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) && | |
65 | (fl4->flowi4_proto == sel->proto || !sel->proto) && | |
66 | (fl4->flowi4_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
67 | } |
68 | ||
bc9b35ad | 69 | static inline bool |
200ce96e | 70 | __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 71 | { |
7e1dc7b6 DM |
72 | const struct flowi6 *fl6 = &fl->u.ip6; |
73 | ||
74 | return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) && | |
75 | addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) && | |
76 | !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) && | |
77 | !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) && | |
78 | (fl6->flowi6_proto == sel->proto || !sel->proto) && | |
79 | (fl6->flowi6_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
80 | } |
81 | ||
bc9b35ad DM |
82 | bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl, |
83 | unsigned short family) | |
77681021 AM |
84 | { |
85 | switch (family) { | |
86 | case AF_INET: | |
87 | return __xfrm4_selector_match(sel, fl); | |
88 | case AF_INET6: | |
89 | return __xfrm6_selector_match(sel, fl); | |
90 | } | |
bc9b35ad | 91 | return false; |
77681021 AM |
92 | } |
93 | ||
ef8531b6 ED |
94 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
95 | { | |
96 | struct xfrm_policy_afinfo *afinfo; | |
97 | ||
98 | if (unlikely(family >= NPROTO)) | |
99 | return NULL; | |
100 | rcu_read_lock(); | |
101 | afinfo = rcu_dereference(xfrm_policy_afinfo[family]); | |
102 | if (unlikely(!afinfo)) | |
103 | rcu_read_unlock(); | |
104 | return afinfo; | |
105 | } | |
106 | ||
107 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
108 | { | |
109 | rcu_read_unlock(); | |
110 | } | |
111 | ||
c5b3cf46 | 112 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, |
6418c4e0 DM |
113 | const xfrm_address_t *saddr, |
114 | const xfrm_address_t *daddr, | |
9bb182a7 YH |
115 | int family) |
116 | { | |
117 | struct xfrm_policy_afinfo *afinfo; | |
118 | struct dst_entry *dst; | |
119 | ||
120 | afinfo = xfrm_policy_get_afinfo(family); | |
121 | if (unlikely(afinfo == NULL)) | |
122 | return ERR_PTR(-EAFNOSUPPORT); | |
123 | ||
c5b3cf46 | 124 | dst = afinfo->dst_lookup(net, tos, saddr, daddr); |
9bb182a7 YH |
125 | |
126 | xfrm_policy_put_afinfo(afinfo); | |
127 | ||
128 | return dst; | |
129 | } | |
130 | ||
25ee3286 | 131 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
9bb182a7 YH |
132 | xfrm_address_t *prev_saddr, |
133 | xfrm_address_t *prev_daddr, | |
25ee3286 | 134 | int family) |
1da177e4 | 135 | { |
c5b3cf46 | 136 | struct net *net = xs_net(x); |
66cdb3ca HX |
137 | xfrm_address_t *saddr = &x->props.saddr; |
138 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
139 | struct dst_entry *dst; |
140 | ||
9bb182a7 | 141 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 142 | saddr = x->coaddr; |
9bb182a7 YH |
143 | daddr = prev_daddr; |
144 | } | |
145 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
146 | saddr = prev_saddr; | |
66cdb3ca | 147 | daddr = x->coaddr; |
9bb182a7 | 148 | } |
1da177e4 | 149 | |
c5b3cf46 | 150 | dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family); |
9bb182a7 YH |
151 | |
152 | if (!IS_ERR(dst)) { | |
153 | if (prev_saddr != saddr) | |
154 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
155 | if (prev_daddr != daddr) | |
156 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
157 | } | |
1da177e4 | 158 | |
66cdb3ca | 159 | return dst; |
1da177e4 | 160 | } |
1da177e4 | 161 | |
1da177e4 LT |
162 | static inline unsigned long make_jiffies(long secs) |
163 | { | |
164 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
165 | return MAX_SCHEDULE_TIMEOUT-1; | |
166 | else | |
a716c119 | 167 | return secs*HZ; |
1da177e4 LT |
168 | } |
169 | ||
170 | static void xfrm_policy_timer(unsigned long data) | |
171 | { | |
3e94c2dc | 172 | struct xfrm_policy *xp = (struct xfrm_policy *)data; |
9d729f72 | 173 | unsigned long now = get_seconds(); |
1da177e4 LT |
174 | long next = LONG_MAX; |
175 | int warn = 0; | |
176 | int dir; | |
177 | ||
178 | read_lock(&xp->lock); | |
179 | ||
ea2dea9d | 180 | if (unlikely(xp->walk.dead)) |
1da177e4 LT |
181 | goto out; |
182 | ||
77d8d7a6 | 183 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
184 | |
185 | if (xp->lft.hard_add_expires_seconds) { | |
186 | long tmo = xp->lft.hard_add_expires_seconds + | |
187 | xp->curlft.add_time - now; | |
188 | if (tmo <= 0) | |
189 | goto expired; | |
190 | if (tmo < next) | |
191 | next = tmo; | |
192 | } | |
193 | if (xp->lft.hard_use_expires_seconds) { | |
194 | long tmo = xp->lft.hard_use_expires_seconds + | |
195 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
196 | if (tmo <= 0) | |
197 | goto expired; | |
198 | if (tmo < next) | |
199 | next = tmo; | |
200 | } | |
201 | if (xp->lft.soft_add_expires_seconds) { | |
202 | long tmo = xp->lft.soft_add_expires_seconds + | |
203 | xp->curlft.add_time - now; | |
204 | if (tmo <= 0) { | |
205 | warn = 1; | |
206 | tmo = XFRM_KM_TIMEOUT; | |
207 | } | |
208 | if (tmo < next) | |
209 | next = tmo; | |
210 | } | |
211 | if (xp->lft.soft_use_expires_seconds) { | |
212 | long tmo = xp->lft.soft_use_expires_seconds + | |
213 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
214 | if (tmo <= 0) { | |
215 | warn = 1; | |
216 | tmo = XFRM_KM_TIMEOUT; | |
217 | } | |
218 | if (tmo < next) | |
219 | next = tmo; | |
220 | } | |
221 | ||
222 | if (warn) | |
6c5c8ca7 | 223 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
224 | if (next != LONG_MAX && |
225 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
226 | xfrm_pol_hold(xp); | |
227 | ||
228 | out: | |
229 | read_unlock(&xp->lock); | |
230 | xfrm_pol_put(xp); | |
231 | return; | |
232 | ||
233 | expired: | |
234 | read_unlock(&xp->lock); | |
4666faab | 235 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 236 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
237 | xfrm_pol_put(xp); |
238 | } | |
239 | ||
fe1a5f03 TT |
240 | static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo) |
241 | { | |
242 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
243 | ||
244 | if (unlikely(pol->walk.dead)) | |
245 | flo = NULL; | |
246 | else | |
247 | xfrm_pol_hold(pol); | |
248 | ||
249 | return flo; | |
250 | } | |
251 | ||
252 | static int xfrm_policy_flo_check(struct flow_cache_object *flo) | |
253 | { | |
254 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
255 | ||
256 | return !pol->walk.dead; | |
257 | } | |
258 | ||
259 | static void xfrm_policy_flo_delete(struct flow_cache_object *flo) | |
260 | { | |
261 | xfrm_pol_put(container_of(flo, struct xfrm_policy, flo)); | |
262 | } | |
263 | ||
264 | static const struct flow_cache_ops xfrm_policy_fc_ops = { | |
265 | .get = xfrm_policy_flo_get, | |
266 | .check = xfrm_policy_flo_check, | |
267 | .delete = xfrm_policy_flo_delete, | |
268 | }; | |
1da177e4 LT |
269 | |
270 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
271 | * SPD calls. | |
272 | */ | |
273 | ||
0331b1f3 | 274 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
275 | { |
276 | struct xfrm_policy *policy; | |
277 | ||
0da974f4 | 278 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
279 | |
280 | if (policy) { | |
0331b1f3 | 281 | write_pnet(&policy->xp_net, net); |
12a169e7 | 282 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
283 | INIT_HLIST_NODE(&policy->bydst); |
284 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 285 | rwlock_init(&policy->lock); |
2518c7c2 | 286 | atomic_set(&policy->refcnt, 1); |
a0073fe1 | 287 | skb_queue_head_init(&policy->polq.hold_queue); |
b24b8a24 PE |
288 | setup_timer(&policy->timer, xfrm_policy_timer, |
289 | (unsigned long)policy); | |
a0073fe1 SK |
290 | setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process, |
291 | (unsigned long)policy); | |
fe1a5f03 | 292 | policy->flo.ops = &xfrm_policy_fc_ops; |
1da177e4 LT |
293 | } |
294 | return policy; | |
295 | } | |
296 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
297 | ||
298 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
299 | ||
64c31b3f | 300 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 301 | { |
12a169e7 | 302 | BUG_ON(!policy->walk.dead); |
1da177e4 | 303 | |
0659eea9 | 304 | if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer)) |
1da177e4 LT |
305 | BUG(); |
306 | ||
03e1ad7b | 307 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
308 | kfree(policy); |
309 | } | |
64c31b3f | 310 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 | 311 | |
a0073fe1 SK |
312 | static void xfrm_queue_purge(struct sk_buff_head *list) |
313 | { | |
314 | struct sk_buff *skb; | |
315 | ||
302a50bc | 316 | while ((skb = skb_dequeue(list)) != NULL) |
a0073fe1 | 317 | kfree_skb(skb); |
a0073fe1 SK |
318 | } |
319 | ||
1da177e4 LT |
320 | /* Rule must be locked. Release descentant resources, announce |
321 | * entry dead. The rule must be unlinked from lists to the moment. | |
322 | */ | |
323 | ||
324 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
325 | { | |
12a169e7 | 326 | policy->walk.dead = 1; |
1da177e4 | 327 | |
285ead17 | 328 | atomic_inc(&policy->genid); |
1da177e4 | 329 | |
e7d8f6cb SK |
330 | if (del_timer(&policy->polq.hold_timer)) |
331 | xfrm_pol_put(policy); | |
a0073fe1 SK |
332 | xfrm_queue_purge(&policy->polq.hold_queue); |
333 | ||
285ead17 TT |
334 | if (del_timer(&policy->timer)) |
335 | xfrm_pol_put(policy); | |
336 | ||
337 | xfrm_pol_put(policy); | |
1da177e4 LT |
338 | } |
339 | ||
2518c7c2 DM |
340 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
341 | ||
e92303f8 | 342 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 343 | { |
e92303f8 | 344 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
345 | } |
346 | ||
5f803b58 DM |
347 | static struct hlist_head *policy_hash_bysel(struct net *net, |
348 | const struct xfrm_selector *sel, | |
349 | unsigned short family, int dir) | |
2518c7c2 | 350 | { |
1121994c | 351 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
352 | unsigned int hash = __sel_hash(sel, family, hmask); |
353 | ||
354 | return (hash == hmask + 1 ? | |
1121994c AD |
355 | &net->xfrm.policy_inexact[dir] : |
356 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
357 | } |
358 | ||
5f803b58 DM |
359 | static struct hlist_head *policy_hash_direct(struct net *net, |
360 | const xfrm_address_t *daddr, | |
361 | const xfrm_address_t *saddr, | |
362 | unsigned short family, int dir) | |
2518c7c2 | 363 | { |
1121994c | 364 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
365 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
366 | ||
1121994c | 367 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
368 | } |
369 | ||
2518c7c2 DM |
370 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
371 | struct hlist_head *ndsttable, | |
372 | unsigned int nhashmask) | |
373 | { | |
b67bfe0d | 374 | struct hlist_node *tmp, *entry0 = NULL; |
2518c7c2 | 375 | struct xfrm_policy *pol; |
b791160b | 376 | unsigned int h0 = 0; |
2518c7c2 | 377 | |
b791160b | 378 | redo: |
b67bfe0d | 379 | hlist_for_each_entry_safe(pol, tmp, list, bydst) { |
2518c7c2 DM |
380 | unsigned int h; |
381 | ||
382 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
383 | pol->family, nhashmask); | |
b791160b | 384 | if (!entry0) { |
b67bfe0d | 385 | hlist_del(&pol->bydst); |
b791160b YH |
386 | hlist_add_head(&pol->bydst, ndsttable+h); |
387 | h0 = h; | |
388 | } else { | |
389 | if (h != h0) | |
390 | continue; | |
b67bfe0d | 391 | hlist_del(&pol->bydst); |
b791160b YH |
392 | hlist_add_after(entry0, &pol->bydst); |
393 | } | |
b67bfe0d | 394 | entry0 = &pol->bydst; |
b791160b YH |
395 | } |
396 | if (!hlist_empty(list)) { | |
397 | entry0 = NULL; | |
398 | goto redo; | |
2518c7c2 DM |
399 | } |
400 | } | |
401 | ||
402 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
403 | struct hlist_head *nidxtable, | |
404 | unsigned int nhashmask) | |
405 | { | |
b67bfe0d | 406 | struct hlist_node *tmp; |
2518c7c2 DM |
407 | struct xfrm_policy *pol; |
408 | ||
b67bfe0d | 409 | hlist_for_each_entry_safe(pol, tmp, list, byidx) { |
2518c7c2 DM |
410 | unsigned int h; |
411 | ||
412 | h = __idx_hash(pol->index, nhashmask); | |
413 | hlist_add_head(&pol->byidx, nidxtable+h); | |
414 | } | |
415 | } | |
416 | ||
417 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
418 | { | |
419 | return ((old_hmask + 1) << 1) - 1; | |
420 | } | |
421 | ||
66caf628 | 422 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 423 | { |
66caf628 | 424 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
425 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
426 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 427 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 428 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
429 | int i; |
430 | ||
431 | if (!ndst) | |
432 | return; | |
433 | ||
283bc9f3 | 434 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
435 | |
436 | for (i = hmask; i >= 0; i--) | |
437 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
438 | ||
66caf628 AD |
439 | net->xfrm.policy_bydst[dir].table = ndst; |
440 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 | 441 | |
283bc9f3 | 442 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 | 443 | |
44e36b42 | 444 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
445 | } |
446 | ||
66caf628 | 447 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 448 | { |
66caf628 | 449 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
450 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
451 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 452 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 453 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
454 | int i; |
455 | ||
456 | if (!nidx) | |
457 | return; | |
458 | ||
283bc9f3 | 459 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
460 | |
461 | for (i = hmask; i >= 0; i--) | |
462 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
463 | ||
66caf628 AD |
464 | net->xfrm.policy_byidx = nidx; |
465 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 | 466 | |
283bc9f3 | 467 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 | 468 | |
44e36b42 | 469 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
470 | } |
471 | ||
66caf628 | 472 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 473 | { |
66caf628 AD |
474 | unsigned int cnt = net->xfrm.policy_count[dir]; |
475 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
476 | |
477 | if (total) | |
478 | *total += cnt; | |
479 | ||
480 | if ((hmask + 1) < xfrm_policy_hashmax && | |
481 | cnt > hmask) | |
482 | return 1; | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
66caf628 | 487 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 488 | { |
66caf628 | 489 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
490 | |
491 | if ((hmask + 1) < xfrm_policy_hashmax && | |
492 | total > hmask) | |
493 | return 1; | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
e071041b | 498 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 | 499 | { |
283bc9f3 | 500 | read_lock_bh(&net->xfrm.xfrm_policy_lock); |
e071041b AD |
501 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
502 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
503 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
504 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
505 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
506 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
507 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 | 508 | si->spdhmcnt = xfrm_policy_hashmax; |
283bc9f3 | 509 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ecfd6b18 JHS |
510 | } |
511 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 512 | |
ecfd6b18 | 513 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 514 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 515 | { |
66caf628 | 516 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
517 | int dir, total; |
518 | ||
519 | mutex_lock(&hash_resize_mutex); | |
520 | ||
521 | total = 0; | |
522 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
66caf628 AD |
523 | if (xfrm_bydst_should_resize(net, dir, &total)) |
524 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 525 | } |
66caf628 AD |
526 | if (xfrm_byidx_should_resize(net, total)) |
527 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
528 | |
529 | mutex_unlock(&hash_resize_mutex); | |
530 | } | |
531 | ||
1da177e4 LT |
532 | /* Generate new index... KAME seems to generate them ordered by cost |
533 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
e682adf0 | 534 | static u32 xfrm_gen_index(struct net *net, int dir, u32 index) |
1da177e4 | 535 | { |
1da177e4 LT |
536 | static u32 idx_generator; |
537 | ||
538 | for (;;) { | |
2518c7c2 DM |
539 | struct hlist_head *list; |
540 | struct xfrm_policy *p; | |
541 | u32 idx; | |
542 | int found; | |
543 | ||
e682adf0 FD |
544 | if (!index) { |
545 | idx = (idx_generator | dir); | |
546 | idx_generator += 8; | |
547 | } else { | |
548 | idx = index; | |
549 | index = 0; | |
550 | } | |
551 | ||
1da177e4 LT |
552 | if (idx == 0) |
553 | idx = 8; | |
1121994c | 554 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 | 555 | found = 0; |
b67bfe0d | 556 | hlist_for_each_entry(p, list, byidx) { |
2518c7c2 DM |
557 | if (p->index == idx) { |
558 | found = 1; | |
1da177e4 | 559 | break; |
2518c7c2 | 560 | } |
1da177e4 | 561 | } |
2518c7c2 | 562 | if (!found) |
1da177e4 LT |
563 | return idx; |
564 | } | |
565 | } | |
566 | ||
2518c7c2 DM |
567 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
568 | { | |
569 | u32 *p1 = (u32 *) s1; | |
570 | u32 *p2 = (u32 *) s2; | |
571 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
572 | int i; | |
573 | ||
574 | for (i = 0; i < len; i++) { | |
575 | if (p1[i] != p2[i]) | |
576 | return 1; | |
577 | } | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
a0073fe1 SK |
582 | static void xfrm_policy_requeue(struct xfrm_policy *old, |
583 | struct xfrm_policy *new) | |
584 | { | |
585 | struct xfrm_policy_queue *pq = &old->polq; | |
586 | struct sk_buff_head list; | |
587 | ||
588 | __skb_queue_head_init(&list); | |
589 | ||
590 | spin_lock_bh(&pq->hold_queue.lock); | |
591 | skb_queue_splice_init(&pq->hold_queue, &list); | |
e7d8f6cb SK |
592 | if (del_timer(&pq->hold_timer)) |
593 | xfrm_pol_put(old); | |
a0073fe1 SK |
594 | spin_unlock_bh(&pq->hold_queue.lock); |
595 | ||
596 | if (skb_queue_empty(&list)) | |
597 | return; | |
598 | ||
599 | pq = &new->polq; | |
600 | ||
601 | spin_lock_bh(&pq->hold_queue.lock); | |
602 | skb_queue_splice(&list, &pq->hold_queue); | |
603 | pq->timeout = XFRM_QUEUE_TMO_MIN; | |
e7d8f6cb SK |
604 | if (!mod_timer(&pq->hold_timer, jiffies)) |
605 | xfrm_pol_hold(new); | |
a0073fe1 SK |
606 | spin_unlock_bh(&pq->hold_queue.lock); |
607 | } | |
608 | ||
7cb8a939 SK |
609 | static bool xfrm_policy_mark_match(struct xfrm_policy *policy, |
610 | struct xfrm_policy *pol) | |
611 | { | |
612 | u32 mark = policy->mark.v & policy->mark.m; | |
613 | ||
614 | if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m) | |
615 | return true; | |
616 | ||
617 | if ((mark & pol->mark.m) == pol->mark.v && | |
618 | policy->priority == pol->priority) | |
619 | return true; | |
620 | ||
621 | return false; | |
622 | } | |
623 | ||
1da177e4 LT |
624 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
625 | { | |
1121994c | 626 | struct net *net = xp_net(policy); |
2518c7c2 DM |
627 | struct xfrm_policy *pol; |
628 | struct xfrm_policy *delpol; | |
629 | struct hlist_head *chain; | |
b67bfe0d | 630 | struct hlist_node *newpos; |
1da177e4 | 631 | |
283bc9f3 | 632 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
1121994c | 633 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
634 | delpol = NULL; |
635 | newpos = NULL; | |
b67bfe0d | 636 | hlist_for_each_entry(pol, chain, bydst) { |
a6c7ab55 | 637 | if (pol->type == policy->type && |
2518c7c2 | 638 | !selector_cmp(&pol->selector, &policy->selector) && |
7cb8a939 | 639 | xfrm_policy_mark_match(policy, pol) && |
a6c7ab55 HX |
640 | xfrm_sec_ctx_match(pol->security, policy->security) && |
641 | !WARN_ON(delpol)) { | |
1da177e4 | 642 | if (excl) { |
283bc9f3 | 643 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
644 | return -EEXIST; |
645 | } | |
1da177e4 LT |
646 | delpol = pol; |
647 | if (policy->priority > pol->priority) | |
648 | continue; | |
649 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 650 | newpos = &pol->bydst; |
1da177e4 LT |
651 | continue; |
652 | } | |
1da177e4 LT |
653 | if (delpol) |
654 | break; | |
1da177e4 LT |
655 | } |
656 | if (newpos) | |
2518c7c2 DM |
657 | hlist_add_after(newpos, &policy->bydst); |
658 | else | |
659 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 660 | xfrm_pol_hold(policy); |
1121994c | 661 | net->xfrm.policy_count[dir]++; |
ca925cf1 | 662 | atomic_inc(&net->xfrm.flow_cache_genid); |
ca4c3fc2 | 663 | |
664 | /* After previous checking, family can either be AF_INET or AF_INET6 */ | |
665 | if (policy->family == AF_INET) | |
666 | rt_genid_bump_ipv4(net); | |
667 | else | |
668 | rt_genid_bump_ipv6(net); | |
669 | ||
a0073fe1 SK |
670 | if (delpol) { |
671 | xfrm_policy_requeue(delpol, policy); | |
29fa0b30 | 672 | __xfrm_policy_unlink(delpol, dir); |
a0073fe1 | 673 | } |
e682adf0 | 674 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index); |
1121994c | 675 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); |
9d729f72 | 676 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
677 | policy->curlft.use_time = 0; |
678 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
679 | xfrm_pol_hold(policy); | |
1121994c | 680 | list_add(&policy->walk.all, &net->xfrm.policy_all); |
283bc9f3 | 681 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 682 | |
9b78a82c | 683 | if (delpol) |
1da177e4 | 684 | xfrm_policy_kill(delpol); |
1121994c AD |
685 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
686 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c | 687 | |
1da177e4 LT |
688 | return 0; |
689 | } | |
690 | EXPORT_SYMBOL(xfrm_policy_insert); | |
691 | ||
8ca2e93b JHS |
692 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
693 | int dir, struct xfrm_selector *sel, | |
ef41aaa0 EP |
694 | struct xfrm_sec_ctx *ctx, int delete, |
695 | int *err) | |
1da177e4 | 696 | { |
2518c7c2 DM |
697 | struct xfrm_policy *pol, *ret; |
698 | struct hlist_head *chain; | |
1da177e4 | 699 | |
ef41aaa0 | 700 | *err = 0; |
283bc9f3 | 701 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
8d1211a6 | 702 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 | 703 | ret = NULL; |
b67bfe0d | 704 | hlist_for_each_entry(pol, chain, bydst) { |
2518c7c2 | 705 | if (pol->type == type && |
34f8d884 | 706 | (mark & pol->mark.m) == pol->mark.v && |
2518c7c2 DM |
707 | !selector_cmp(sel, &pol->selector) && |
708 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 709 | xfrm_pol_hold(pol); |
2518c7c2 | 710 | if (delete) { |
03e1ad7b PM |
711 | *err = security_xfrm_policy_delete( |
712 | pol->security); | |
ef41aaa0 | 713 | if (*err) { |
283bc9f3 | 714 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ef41aaa0 EP |
715 | return pol; |
716 | } | |
29fa0b30 | 717 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
718 | } |
719 | ret = pol; | |
1da177e4 LT |
720 | break; |
721 | } | |
722 | } | |
283bc9f3 | 723 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 724 | |
fe1a5f03 | 725 | if (ret && delete) |
2518c7c2 | 726 | xfrm_policy_kill(ret); |
2518c7c2 | 727 | return ret; |
1da177e4 | 728 | } |
df71837d | 729 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 730 | |
8ca2e93b JHS |
731 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
732 | int dir, u32 id, int delete, int *err) | |
1da177e4 | 733 | { |
2518c7c2 DM |
734 | struct xfrm_policy *pol, *ret; |
735 | struct hlist_head *chain; | |
1da177e4 | 736 | |
b5505c6e HX |
737 | *err = -ENOENT; |
738 | if (xfrm_policy_id2dir(id) != dir) | |
739 | return NULL; | |
740 | ||
ef41aaa0 | 741 | *err = 0; |
283bc9f3 | 742 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
8d1211a6 | 743 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 | 744 | ret = NULL; |
b67bfe0d | 745 | hlist_for_each_entry(pol, chain, byidx) { |
34f8d884 JHS |
746 | if (pol->type == type && pol->index == id && |
747 | (mark & pol->mark.m) == pol->mark.v) { | |
1da177e4 | 748 | xfrm_pol_hold(pol); |
2518c7c2 | 749 | if (delete) { |
03e1ad7b PM |
750 | *err = security_xfrm_policy_delete( |
751 | pol->security); | |
ef41aaa0 | 752 | if (*err) { |
283bc9f3 | 753 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ef41aaa0 EP |
754 | return pol; |
755 | } | |
29fa0b30 | 756 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
757 | } |
758 | ret = pol; | |
1da177e4 LT |
759 | break; |
760 | } | |
761 | } | |
283bc9f3 | 762 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 763 | |
fe1a5f03 | 764 | if (ret && delete) |
2518c7c2 | 765 | xfrm_policy_kill(ret); |
2518c7c2 | 766 | return ret; |
1da177e4 LT |
767 | } |
768 | EXPORT_SYMBOL(xfrm_policy_byid); | |
769 | ||
4aa2e62c JL |
770 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
771 | static inline int | |
33ffbbd5 | 772 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 773 | { |
4aa2e62c JL |
774 | int dir, err = 0; |
775 | ||
776 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
777 | struct xfrm_policy *pol; | |
4aa2e62c JL |
778 | int i; |
779 | ||
b67bfe0d | 780 | hlist_for_each_entry(pol, |
33ffbbd5 | 781 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
782 | if (pol->type != type) |
783 | continue; | |
03e1ad7b | 784 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 785 | if (err) { |
ab5f5e8b JL |
786 | xfrm_audit_policy_delete(pol, 0, |
787 | audit_info->loginuid, | |
2532386f | 788 | audit_info->sessionid, |
ab5f5e8b | 789 | audit_info->secid); |
4aa2e62c JL |
790 | return err; |
791 | } | |
7dc12d6d | 792 | } |
33ffbbd5 | 793 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
b67bfe0d | 794 | hlist_for_each_entry(pol, |
33ffbbd5 | 795 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
796 | bydst) { |
797 | if (pol->type != type) | |
798 | continue; | |
03e1ad7b PM |
799 | err = security_xfrm_policy_delete( |
800 | pol->security); | |
4aa2e62c | 801 | if (err) { |
ab5f5e8b JL |
802 | xfrm_audit_policy_delete(pol, 0, |
803 | audit_info->loginuid, | |
2532386f | 804 | audit_info->sessionid, |
ab5f5e8b | 805 | audit_info->secid); |
4aa2e62c JL |
806 | return err; |
807 | } | |
808 | } | |
809 | } | |
810 | } | |
811 | return err; | |
812 | } | |
813 | #else | |
814 | static inline int | |
33ffbbd5 | 815 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
816 | { |
817 | return 0; | |
818 | } | |
819 | #endif | |
820 | ||
33ffbbd5 | 821 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c | 822 | { |
2f1eb65f | 823 | int dir, err = 0, cnt = 0; |
1da177e4 | 824 | |
283bc9f3 | 825 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
4aa2e62c | 826 | |
33ffbbd5 | 827 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
4aa2e62c JL |
828 | if (err) |
829 | goto out; | |
830 | ||
1da177e4 | 831 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 | 832 | struct xfrm_policy *pol; |
29fa0b30 | 833 | int i; |
2518c7c2 DM |
834 | |
835 | again1: | |
b67bfe0d | 836 | hlist_for_each_entry(pol, |
33ffbbd5 | 837 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
838 | if (pol->type != type) |
839 | continue; | |
ea2dea9d | 840 | __xfrm_policy_unlink(pol, dir); |
283bc9f3 | 841 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ea2dea9d | 842 | cnt++; |
1da177e4 | 843 | |
ab5f5e8b | 844 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 845 | audit_info->sessionid, |
ab5f5e8b | 846 | audit_info->secid); |
161a09e7 | 847 | |
2518c7c2 | 848 | xfrm_policy_kill(pol); |
1da177e4 | 849 | |
283bc9f3 | 850 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
851 | goto again1; |
852 | } | |
853 | ||
33ffbbd5 | 854 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 | 855 | again2: |
b67bfe0d | 856 | hlist_for_each_entry(pol, |
33ffbbd5 | 857 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
858 | bydst) { |
859 | if (pol->type != type) | |
860 | continue; | |
ea2dea9d | 861 | __xfrm_policy_unlink(pol, dir); |
283bc9f3 | 862 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
ea2dea9d | 863 | cnt++; |
2518c7c2 | 864 | |
ab5f5e8b JL |
865 | xfrm_audit_policy_delete(pol, 1, |
866 | audit_info->loginuid, | |
2532386f | 867 | audit_info->sessionid, |
ab5f5e8b | 868 | audit_info->secid); |
2518c7c2 DM |
869 | xfrm_policy_kill(pol); |
870 | ||
283bc9f3 | 871 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
2518c7c2 DM |
872 | goto again2; |
873 | } | |
1da177e4 | 874 | } |
2518c7c2 | 875 | |
1da177e4 | 876 | } |
2f1eb65f JHS |
877 | if (!cnt) |
878 | err = -ESRCH; | |
4aa2e62c | 879 | out: |
283bc9f3 | 880 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
4aa2e62c | 881 | return err; |
1da177e4 LT |
882 | } |
883 | EXPORT_SYMBOL(xfrm_policy_flush); | |
884 | ||
cdcbca7c | 885 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 886 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
887 | void *data) |
888 | { | |
12a169e7 HX |
889 | struct xfrm_policy *pol; |
890 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
891 | int error = 0; |
892 | ||
893 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
894 | walk->type != XFRM_POLICY_TYPE_ANY) | |
895 | return -EINVAL; | |
1da177e4 | 896 | |
12a169e7 | 897 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
898 | return 0; |
899 | ||
283bc9f3 | 900 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
12a169e7 | 901 | if (list_empty(&walk->walk.all)) |
cdcbca7c | 902 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
903 | else |
904 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
cdcbca7c | 905 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 906 | if (x->dead) |
4c563f76 | 907 | continue; |
12a169e7 HX |
908 | pol = container_of(x, struct xfrm_policy, walk); |
909 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
910 | walk->type != pol->type) | |
911 | continue; | |
912 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
913 | walk->seq, data); | |
914 | if (error) { | |
915 | list_move_tail(&walk->walk.all, &x->all); | |
916 | goto out; | |
2518c7c2 | 917 | } |
12a169e7 | 918 | walk->seq++; |
1da177e4 | 919 | } |
12a169e7 | 920 | if (walk->seq == 0) { |
baf5d743 JHS |
921 | error = -ENOENT; |
922 | goto out; | |
923 | } | |
12a169e7 | 924 | list_del_init(&walk->walk.all); |
1da177e4 | 925 | out: |
283bc9f3 | 926 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
927 | return error; |
928 | } | |
929 | EXPORT_SYMBOL(xfrm_policy_walk); | |
930 | ||
12a169e7 HX |
931 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
932 | { | |
933 | INIT_LIST_HEAD(&walk->walk.all); | |
934 | walk->walk.dead = 1; | |
935 | walk->type = type; | |
936 | walk->seq = 0; | |
937 | } | |
938 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
939 | ||
283bc9f3 | 940 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net) |
12a169e7 HX |
941 | { |
942 | if (list_empty(&walk->walk.all)) | |
943 | return; | |
944 | ||
283bc9f3 | 945 | write_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */ |
12a169e7 | 946 | list_del(&walk->walk.all); |
283bc9f3 | 947 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
12a169e7 HX |
948 | } |
949 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
950 | ||
134b0fc5 JM |
951 | /* |
952 | * Find policy to apply to this flow. | |
953 | * | |
954 | * Returns 0 if policy found, else an -errno. | |
955 | */ | |
f299d557 DM |
956 | static int xfrm_policy_match(const struct xfrm_policy *pol, |
957 | const struct flowi *fl, | |
2518c7c2 | 958 | u8 type, u16 family, int dir) |
1da177e4 | 959 | { |
f299d557 | 960 | const struct xfrm_selector *sel = &pol->selector; |
bc9b35ad DM |
961 | int ret = -ESRCH; |
962 | bool match; | |
1da177e4 | 963 | |
2518c7c2 | 964 | if (pol->family != family || |
1d28f42c | 965 | (fl->flowi_mark & pol->mark.m) != pol->mark.v || |
2518c7c2 | 966 | pol->type != type) |
134b0fc5 | 967 | return ret; |
1da177e4 | 968 | |
2518c7c2 | 969 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 970 | if (match) |
1d28f42c | 971 | ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid, |
03e1ad7b | 972 | dir); |
2518c7c2 | 973 | |
134b0fc5 | 974 | return ret; |
2518c7c2 | 975 | } |
1da177e4 | 976 | |
52479b62 | 977 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
062cdb43 | 978 | const struct flowi *fl, |
2518c7c2 DM |
979 | u16 family, u8 dir) |
980 | { | |
134b0fc5 | 981 | int err; |
2518c7c2 | 982 | struct xfrm_policy *pol, *ret; |
0b597e7e | 983 | const xfrm_address_t *daddr, *saddr; |
2518c7c2 | 984 | struct hlist_head *chain; |
acba48e1 | 985 | u32 priority = ~0U; |
df71837d | 986 | |
2518c7c2 DM |
987 | daddr = xfrm_flowi_daddr(fl, family); |
988 | saddr = xfrm_flowi_saddr(fl, family); | |
989 | if (unlikely(!daddr || !saddr)) | |
990 | return NULL; | |
991 | ||
283bc9f3 | 992 | read_lock_bh(&net->xfrm.xfrm_policy_lock); |
52479b62 | 993 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 | 994 | ret = NULL; |
b67bfe0d | 995 | hlist_for_each_entry(pol, chain, bydst) { |
134b0fc5 JM |
996 | err = xfrm_policy_match(pol, fl, type, family, dir); |
997 | if (err) { | |
998 | if (err == -ESRCH) | |
999 | continue; | |
1000 | else { | |
1001 | ret = ERR_PTR(err); | |
1002 | goto fail; | |
1003 | } | |
1004 | } else { | |
2518c7c2 | 1005 | ret = pol; |
acba48e1 | 1006 | priority = ret->priority; |
2518c7c2 DM |
1007 | break; |
1008 | } | |
1009 | } | |
52479b62 | 1010 | chain = &net->xfrm.policy_inexact[dir]; |
b67bfe0d | 1011 | hlist_for_each_entry(pol, chain, bydst) { |
134b0fc5 JM |
1012 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1013 | if (err) { | |
1014 | if (err == -ESRCH) | |
1015 | continue; | |
1016 | else { | |
1017 | ret = ERR_PTR(err); | |
1018 | goto fail; | |
1019 | } | |
1020 | } else if (pol->priority < priority) { | |
acba48e1 DM |
1021 | ret = pol; |
1022 | break; | |
1da177e4 LT |
1023 | } |
1024 | } | |
acba48e1 DM |
1025 | if (ret) |
1026 | xfrm_pol_hold(ret); | |
134b0fc5 | 1027 | fail: |
283bc9f3 | 1028 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
4e81bb83 | 1029 | |
2518c7c2 | 1030 | return ret; |
4e81bb83 MN |
1031 | } |
1032 | ||
80c802f3 | 1033 | static struct xfrm_policy * |
73ff93cd | 1034 | __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir) |
80c802f3 TT |
1035 | { |
1036 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1037 | struct xfrm_policy *pol; | |
1038 | ||
1039 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
1040 | if (pol != NULL) | |
1041 | return pol; | |
1042 | #endif | |
1043 | return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
1044 | } | |
1045 | ||
b5fb82c4 BZ |
1046 | static int flow_to_policy_dir(int dir) |
1047 | { | |
1048 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
1049 | XFRM_POLICY_OUT == FLOW_DIR_OUT && | |
1050 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1051 | return dir; | |
1052 | ||
1053 | switch (dir) { | |
1054 | default: | |
1055 | case FLOW_DIR_IN: | |
1056 | return XFRM_POLICY_IN; | |
1057 | case FLOW_DIR_OUT: | |
1058 | return XFRM_POLICY_OUT; | |
1059 | case FLOW_DIR_FWD: | |
1060 | return XFRM_POLICY_FWD; | |
1061 | } | |
1062 | } | |
1063 | ||
fe1a5f03 | 1064 | static struct flow_cache_object * |
dee9f4bc | 1065 | xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, |
fe1a5f03 | 1066 | u8 dir, struct flow_cache_object *old_obj, void *ctx) |
4e81bb83 MN |
1067 | { |
1068 | struct xfrm_policy *pol; | |
fe1a5f03 TT |
1069 | |
1070 | if (old_obj) | |
1071 | xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); | |
4e81bb83 | 1072 | |
b5fb82c4 | 1073 | pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir)); |
80c802f3 | 1074 | if (IS_ERR_OR_NULL(pol)) |
fe1a5f03 | 1075 | return ERR_CAST(pol); |
fe1a5f03 | 1076 | |
fe1a5f03 TT |
1077 | /* Resolver returns two references: |
1078 | * one for cache and one for caller of flow_cache_lookup() */ | |
1079 | xfrm_pol_hold(pol); | |
1080 | ||
1081 | return &pol->flo; | |
1da177e4 LT |
1082 | } |
1083 | ||
df71837d TJ |
1084 | static inline int policy_to_flow_dir(int dir) |
1085 | { | |
1086 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1087 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1088 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1089 | return dir; | |
1090 | switch (dir) { | |
1091 | default: | |
1092 | case XFRM_POLICY_IN: | |
1093 | return FLOW_DIR_IN; | |
1094 | case XFRM_POLICY_OUT: | |
1095 | return FLOW_DIR_OUT; | |
1096 | case XFRM_POLICY_FWD: | |
1097 | return FLOW_DIR_FWD; | |
3ff50b79 | 1098 | } |
df71837d TJ |
1099 | } |
1100 | ||
dee9f4bc DM |
1101 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, |
1102 | const struct flowi *fl) | |
1da177e4 LT |
1103 | { |
1104 | struct xfrm_policy *pol; | |
283bc9f3 | 1105 | struct net *net = sock_net(sk); |
1da177e4 | 1106 | |
283bc9f3 | 1107 | read_lock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 1108 | if ((pol = sk->sk_policy[dir]) != NULL) { |
bc9b35ad DM |
1109 | bool match = xfrm_selector_match(&pol->selector, fl, |
1110 | sk->sk_family); | |
a716c119 | 1111 | int err = 0; |
df71837d | 1112 | |
3bccfbc7 | 1113 | if (match) { |
34f8d884 JHS |
1114 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
1115 | pol = NULL; | |
1116 | goto out; | |
1117 | } | |
03e1ad7b | 1118 | err = security_xfrm_policy_lookup(pol->security, |
1d28f42c | 1119 | fl->flowi_secid, |
03e1ad7b | 1120 | policy_to_flow_dir(dir)); |
3bccfbc7 VY |
1121 | if (!err) |
1122 | xfrm_pol_hold(pol); | |
1123 | else if (err == -ESRCH) | |
1124 | pol = NULL; | |
1125 | else | |
1126 | pol = ERR_PTR(err); | |
1127 | } else | |
1da177e4 LT |
1128 | pol = NULL; |
1129 | } | |
34f8d884 | 1130 | out: |
283bc9f3 | 1131 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1132 | return pol; |
1133 | } | |
1134 | ||
1135 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1136 | { | |
98806f75 | 1137 | struct net *net = xp_net(pol); |
1121994c | 1138 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
2518c7c2 | 1139 | pol->family, dir); |
4e81bb83 | 1140 | |
98806f75 | 1141 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
2518c7c2 | 1142 | hlist_add_head(&pol->bydst, chain); |
e92303f8 | 1143 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
98806f75 | 1144 | net->xfrm.policy_count[dir]++; |
1da177e4 | 1145 | xfrm_pol_hold(pol); |
2518c7c2 | 1146 | |
98806f75 AD |
1147 | if (xfrm_bydst_should_resize(net, dir, NULL)) |
1148 | schedule_work(&net->xfrm.policy_hash_work); | |
1da177e4 LT |
1149 | } |
1150 | ||
1151 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1152 | int dir) | |
1153 | { | |
98806f75 AD |
1154 | struct net *net = xp_net(pol); |
1155 | ||
2518c7c2 DM |
1156 | if (hlist_unhashed(&pol->bydst)) |
1157 | return NULL; | |
1da177e4 | 1158 | |
3a9016f9 | 1159 | hlist_del_init(&pol->bydst); |
2518c7c2 | 1160 | hlist_del(&pol->byidx); |
12a169e7 | 1161 | list_del(&pol->walk.all); |
98806f75 | 1162 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1163 | |
1164 | return pol; | |
1da177e4 LT |
1165 | } |
1166 | ||
4666faab | 1167 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 | 1168 | { |
283bc9f3 FD |
1169 | struct net *net = xp_net(pol); |
1170 | ||
1171 | write_lock_bh(&net->xfrm.xfrm_policy_lock); | |
1da177e4 | 1172 | pol = __xfrm_policy_unlink(pol, dir); |
283bc9f3 | 1173 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 1174 | if (pol) { |
1da177e4 | 1175 | xfrm_policy_kill(pol); |
4666faab | 1176 | return 0; |
1da177e4 | 1177 | } |
4666faab | 1178 | return -ENOENT; |
1da177e4 | 1179 | } |
a70fcb0b | 1180 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1181 | |
1182 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1183 | { | |
1121994c | 1184 | struct net *net = xp_net(pol); |
1da177e4 LT |
1185 | struct xfrm_policy *old_pol; |
1186 | ||
4e81bb83 MN |
1187 | #ifdef CONFIG_XFRM_SUB_POLICY |
1188 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1189 | return -EINVAL; | |
1190 | #endif | |
1191 | ||
283bc9f3 | 1192 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1193 | old_pol = sk->sk_policy[dir]; |
1194 | sk->sk_policy[dir] = pol; | |
1195 | if (pol) { | |
9d729f72 | 1196 | pol->curlft.add_time = get_seconds(); |
e682adf0 | 1197 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0); |
1da177e4 LT |
1198 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1199 | } | |
a0073fe1 SK |
1200 | if (old_pol) { |
1201 | if (pol) | |
1202 | xfrm_policy_requeue(old_pol, pol); | |
1203 | ||
ea2dea9d TT |
1204 | /* Unlinking succeeds always. This is the only function |
1205 | * allowed to delete or replace socket policy. | |
1206 | */ | |
1da177e4 | 1207 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); |
a0073fe1 | 1208 | } |
283bc9f3 | 1209 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1210 | |
1211 | if (old_pol) { | |
1212 | xfrm_policy_kill(old_pol); | |
1213 | } | |
1214 | return 0; | |
1215 | } | |
1216 | ||
d3e40a9f | 1217 | static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir) |
1da177e4 | 1218 | { |
0331b1f3 | 1219 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
283bc9f3 | 1220 | struct net *net = xp_net(old); |
1da177e4 LT |
1221 | |
1222 | if (newp) { | |
1223 | newp->selector = old->selector; | |
03e1ad7b PM |
1224 | if (security_xfrm_policy_clone(old->security, |
1225 | &newp->security)) { | |
df71837d TJ |
1226 | kfree(newp); |
1227 | return NULL; /* ENOMEM */ | |
1228 | } | |
1da177e4 LT |
1229 | newp->lft = old->lft; |
1230 | newp->curlft = old->curlft; | |
fb977e2c | 1231 | newp->mark = old->mark; |
1da177e4 LT |
1232 | newp->action = old->action; |
1233 | newp->flags = old->flags; | |
1234 | newp->xfrm_nr = old->xfrm_nr; | |
1235 | newp->index = old->index; | |
4e81bb83 | 1236 | newp->type = old->type; |
1da177e4 LT |
1237 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1238 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
283bc9f3 | 1239 | write_lock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 | 1240 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); |
283bc9f3 | 1241 | write_unlock_bh(&net->xfrm.xfrm_policy_lock); |
1da177e4 LT |
1242 | xfrm_pol_put(newp); |
1243 | } | |
1244 | return newp; | |
1245 | } | |
1246 | ||
1247 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1248 | { | |
1249 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1250 | *p1 = sk->sk_policy[1]; | |
1251 | ||
1252 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1253 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1254 | return -ENOMEM; | |
1255 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1256 | return -ENOMEM; | |
1257 | return 0; | |
1258 | } | |
1259 | ||
a1e59abf | 1260 | static int |
fbda33b2 | 1261 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
a1e59abf PM |
1262 | unsigned short family) |
1263 | { | |
1264 | int err; | |
1265 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1266 | ||
1267 | if (unlikely(afinfo == NULL)) | |
1268 | return -EINVAL; | |
fbda33b2 | 1269 | err = afinfo->get_saddr(net, local, remote); |
a1e59abf PM |
1270 | xfrm_policy_put_afinfo(afinfo); |
1271 | return err; | |
1272 | } | |
1273 | ||
1da177e4 LT |
1274 | /* Resolve list of templates for the flow, given policy. */ |
1275 | ||
1276 | static int | |
a6c2e611 DM |
1277 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl, |
1278 | struct xfrm_state **xfrm, unsigned short family) | |
1da177e4 | 1279 | { |
fbda33b2 | 1280 | struct net *net = xp_net(policy); |
1da177e4 LT |
1281 | int nx; |
1282 | int i, error; | |
1283 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1284 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1285 | xfrm_address_t tmp; |
1da177e4 | 1286 | |
9b7a787d | 1287 | for (nx = 0, i = 0; i < policy->xfrm_nr; i++) { |
1da177e4 LT |
1288 | struct xfrm_state *x; |
1289 | xfrm_address_t *remote = daddr; | |
1290 | xfrm_address_t *local = saddr; | |
1291 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1292 | ||
48b8d783 JK |
1293 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1294 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1295 | remote = &tmpl->id.daddr; |
1296 | local = &tmpl->saddr; | |
8444cf71 TE |
1297 | if (xfrm_addr_any(local, tmpl->encap_family)) { |
1298 | error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family); | |
a1e59abf PM |
1299 | if (error) |
1300 | goto fail; | |
1301 | local = &tmp; | |
1302 | } | |
1da177e4 LT |
1303 | } |
1304 | ||
1305 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1306 | ||
1307 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1308 | xfrm[nx++] = x; | |
1309 | daddr = remote; | |
1310 | saddr = local; | |
1311 | continue; | |
1312 | } | |
1313 | if (x) { | |
1314 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1315 | -EINVAL : -EAGAIN); | |
1316 | xfrm_state_put(x); | |
42054569 | 1317 | } else if (error == -ESRCH) { |
a4322266 | 1318 | error = -EAGAIN; |
42054569 | 1319 | } |
1da177e4 LT |
1320 | |
1321 | if (!tmpl->optional) | |
1322 | goto fail; | |
1323 | } | |
1324 | return nx; | |
1325 | ||
1326 | fail: | |
9b7a787d | 1327 | for (nx--; nx >= 0; nx--) |
1da177e4 LT |
1328 | xfrm_state_put(xfrm[nx]); |
1329 | return error; | |
1330 | } | |
1331 | ||
4e81bb83 | 1332 | static int |
a6c2e611 DM |
1333 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl, |
1334 | struct xfrm_state **xfrm, unsigned short family) | |
4e81bb83 | 1335 | { |
41a49cc3 MN |
1336 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1337 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1338 | int cnx = 0; |
1339 | int error; | |
1340 | int ret; | |
1341 | int i; | |
1342 | ||
1343 | for (i = 0; i < npols; i++) { | |
1344 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1345 | error = -ENOBUFS; | |
1346 | goto fail; | |
1347 | } | |
41a49cc3 MN |
1348 | |
1349 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1350 | if (ret < 0) { |
1351 | error = ret; | |
1352 | goto fail; | |
1353 | } else | |
1354 | cnx += ret; | |
1355 | } | |
1356 | ||
41a49cc3 MN |
1357 | /* found states are sorted for outbound processing */ |
1358 | if (npols > 1) | |
1359 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1360 | ||
4e81bb83 MN |
1361 | return cnx; |
1362 | ||
1363 | fail: | |
9b7a787d | 1364 | for (cnx--; cnx >= 0; cnx--) |
41a49cc3 | 1365 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1366 | return error; |
1367 | ||
1368 | } | |
1369 | ||
1da177e4 LT |
1370 | /* Check that the bundle accepts the flow and its components are |
1371 | * still valid. | |
1372 | */ | |
1373 | ||
05d84025 | 1374 | static inline int xfrm_get_tos(const struct flowi *fl, int family) |
25ee3286 HX |
1375 | { |
1376 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1377 | int tos; | |
1da177e4 | 1378 | |
25ee3286 HX |
1379 | if (!afinfo) |
1380 | return -EINVAL; | |
1381 | ||
1382 | tos = afinfo->get_tos(fl); | |
1383 | ||
1384 | xfrm_policy_put_afinfo(afinfo); | |
1385 | ||
1386 | return tos; | |
1387 | } | |
1388 | ||
80c802f3 TT |
1389 | static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) |
1390 | { | |
1391 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1392 | struct dst_entry *dst = &xdst->u.dst; | |
1393 | ||
1394 | if (xdst->route == NULL) { | |
1395 | /* Dummy bundle - if it has xfrms we were not | |
1396 | * able to build bundle as template resolution failed. | |
1397 | * It means we need to try again resolving. */ | |
1398 | if (xdst->num_xfrms > 0) | |
1399 | return NULL; | |
a0073fe1 SK |
1400 | } else if (dst->flags & DST_XFRM_QUEUE) { |
1401 | return NULL; | |
80c802f3 TT |
1402 | } else { |
1403 | /* Real bundle */ | |
1404 | if (stale_bundle(dst)) | |
1405 | return NULL; | |
1406 | } | |
1407 | ||
1408 | dst_hold(dst); | |
1409 | return flo; | |
1410 | } | |
1411 | ||
1412 | static int xfrm_bundle_flo_check(struct flow_cache_object *flo) | |
1413 | { | |
1414 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1415 | struct dst_entry *dst = &xdst->u.dst; | |
1416 | ||
1417 | if (!xdst->route) | |
1418 | return 0; | |
1419 | if (stale_bundle(dst)) | |
1420 | return 0; | |
1421 | ||
1422 | return 1; | |
1423 | } | |
1424 | ||
1425 | static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) | |
1426 | { | |
1427 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1428 | struct dst_entry *dst = &xdst->u.dst; | |
1429 | ||
1430 | dst_free(dst); | |
1431 | } | |
1432 | ||
1433 | static const struct flow_cache_ops xfrm_bundle_fc_ops = { | |
1434 | .get = xfrm_bundle_flo_get, | |
1435 | .check = xfrm_bundle_flo_check, | |
1436 | .delete = xfrm_bundle_flo_delete, | |
1437 | }; | |
1438 | ||
d7c7544c | 1439 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1440 | { |
1da177e4 | 1441 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1442 | struct dst_ops *dst_ops; |
25ee3286 HX |
1443 | struct xfrm_dst *xdst; |
1444 | ||
1445 | if (!afinfo) | |
1446 | return ERR_PTR(-EINVAL); | |
1447 | ||
d7c7544c AD |
1448 | switch (family) { |
1449 | case AF_INET: | |
1450 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1451 | break; | |
dfd56b8b | 1452 | #if IS_ENABLED(CONFIG_IPV6) |
d7c7544c AD |
1453 | case AF_INET6: |
1454 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1455 | break; | |
1456 | #endif | |
1457 | default: | |
1458 | BUG(); | |
1459 | } | |
f5b0a874 | 1460 | xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0); |
25ee3286 | 1461 | |
d4cae562 | 1462 | if (likely(xdst)) { |
141e369d SK |
1463 | struct dst_entry *dst = &xdst->u.dst; |
1464 | ||
1465 | memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst)); | |
0b150932 | 1466 | xdst->flo.ops = &xfrm_bundle_fc_ops; |
9d7b0fc1 PM |
1467 | if (afinfo->init_dst) |
1468 | afinfo->init_dst(net, xdst); | |
d4cae562 | 1469 | } else |
0b150932 | 1470 | xdst = ERR_PTR(-ENOBUFS); |
80c802f3 | 1471 | |
d4cae562 MB |
1472 | xfrm_policy_put_afinfo(afinfo); |
1473 | ||
25ee3286 HX |
1474 | return xdst; |
1475 | } | |
1476 | ||
a1b05140 MN |
1477 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1478 | int nfheader_len) | |
1479 | { | |
1480 | struct xfrm_policy_afinfo *afinfo = | |
1481 | xfrm_policy_get_afinfo(dst->ops->family); | |
1482 | int err; | |
1483 | ||
1484 | if (!afinfo) | |
1485 | return -EINVAL; | |
1486 | ||
1487 | err = afinfo->init_path(path, dst, nfheader_len); | |
1488 | ||
1489 | xfrm_policy_put_afinfo(afinfo); | |
1490 | ||
1491 | return err; | |
1492 | } | |
1493 | ||
87c1e12b | 1494 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 1495 | const struct flowi *fl) |
25ee3286 HX |
1496 | { |
1497 | struct xfrm_policy_afinfo *afinfo = | |
1498 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1499 | int err; | |
1500 | ||
1501 | if (!afinfo) | |
1da177e4 | 1502 | return -EINVAL; |
25ee3286 | 1503 | |
87c1e12b | 1504 | err = afinfo->fill_dst(xdst, dev, fl); |
25ee3286 | 1505 | |
1da177e4 | 1506 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1507 | |
1da177e4 LT |
1508 | return err; |
1509 | } | |
1510 | ||
80c802f3 | 1511 | |
25ee3286 HX |
1512 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1513 | * all the metrics... Shortly, bundle a bundle. | |
1514 | */ | |
1515 | ||
1516 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1517 | struct xfrm_state **xfrm, int nx, | |
98313ada | 1518 | const struct flowi *fl, |
25ee3286 HX |
1519 | struct dst_entry *dst) |
1520 | { | |
d7c7544c | 1521 | struct net *net = xp_net(policy); |
25ee3286 HX |
1522 | unsigned long now = jiffies; |
1523 | struct net_device *dev; | |
43a4dea4 | 1524 | struct xfrm_mode *inner_mode; |
25ee3286 HX |
1525 | struct dst_entry *dst_prev = NULL; |
1526 | struct dst_entry *dst0 = NULL; | |
1527 | int i = 0; | |
1528 | int err; | |
1529 | int header_len = 0; | |
a1b05140 | 1530 | int nfheader_len = 0; |
25ee3286 HX |
1531 | int trailer_len = 0; |
1532 | int tos; | |
1533 | int family = policy->selector.family; | |
9bb182a7 YH |
1534 | xfrm_address_t saddr, daddr; |
1535 | ||
1536 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1537 | |
1538 | tos = xfrm_get_tos(fl, family); | |
1539 | err = tos; | |
1540 | if (tos < 0) | |
1541 | goto put_states; | |
1542 | ||
1543 | dst_hold(dst); | |
1544 | ||
1545 | for (; i < nx; i++) { | |
d7c7544c | 1546 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1547 | struct dst_entry *dst1 = &xdst->u.dst; |
1548 | ||
1549 | err = PTR_ERR(xdst); | |
1550 | if (IS_ERR(xdst)) { | |
1551 | dst_release(dst); | |
1552 | goto put_states; | |
1553 | } | |
1554 | ||
43a4dea4 SK |
1555 | if (xfrm[i]->sel.family == AF_UNSPEC) { |
1556 | inner_mode = xfrm_ip2inner_mode(xfrm[i], | |
1557 | xfrm_af2proto(family)); | |
1558 | if (!inner_mode) { | |
1559 | err = -EAFNOSUPPORT; | |
1560 | dst_release(dst); | |
1561 | goto put_states; | |
1562 | } | |
1563 | } else | |
1564 | inner_mode = xfrm[i]->inner_mode; | |
1565 | ||
25ee3286 HX |
1566 | if (!dst_prev) |
1567 | dst0 = dst1; | |
1568 | else { | |
1569 | dst_prev->child = dst_clone(dst1); | |
1570 | dst1->flags |= DST_NOHASH; | |
1571 | } | |
1572 | ||
1573 | xdst->route = dst; | |
defb3519 | 1574 | dst_copy_metrics(dst1, dst); |
25ee3286 HX |
1575 | |
1576 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1577 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1578 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1579 | family); | |
25ee3286 HX |
1580 | err = PTR_ERR(dst); |
1581 | if (IS_ERR(dst)) | |
1582 | goto put_states; | |
1583 | } else | |
1584 | dst_hold(dst); | |
1585 | ||
1586 | dst1->xfrm = xfrm[i]; | |
80c802f3 | 1587 | xdst->xfrm_genid = xfrm[i]->genid; |
25ee3286 | 1588 | |
f5b0a874 | 1589 | dst1->obsolete = DST_OBSOLETE_FORCE_CHK; |
25ee3286 HX |
1590 | dst1->flags |= DST_HOST; |
1591 | dst1->lastuse = now; | |
1592 | ||
1593 | dst1->input = dst_discard; | |
43a4dea4 | 1594 | dst1->output = inner_mode->afinfo->output; |
25ee3286 HX |
1595 | |
1596 | dst1->next = dst_prev; | |
1597 | dst_prev = dst1; | |
1598 | ||
1599 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1600 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1601 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1602 | trailer_len += xfrm[i]->props.trailer_len; |
1603 | } | |
1604 | ||
1605 | dst_prev->child = dst; | |
1606 | dst0->path = dst; | |
1607 | ||
1608 | err = -ENODEV; | |
1609 | dev = dst->dev; | |
1610 | if (!dev) | |
1611 | goto free_dst; | |
1612 | ||
a1b05140 | 1613 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1614 | xfrm_init_pmtu(dst_prev); |
1615 | ||
1616 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1617 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1618 | ||
87c1e12b | 1619 | err = xfrm_fill_dst(xdst, dev, fl); |
25ee3286 HX |
1620 | if (err) |
1621 | goto free_dst; | |
1622 | ||
1623 | dst_prev->header_len = header_len; | |
1624 | dst_prev->trailer_len = trailer_len; | |
1625 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1626 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1627 | } | |
1628 | ||
1629 | out: | |
1630 | return dst0; | |
1631 | ||
1632 | put_states: | |
1633 | for (; i < nx; i++) | |
1634 | xfrm_state_put(xfrm[i]); | |
1635 | free_dst: | |
1636 | if (dst0) | |
1637 | dst_free(dst0); | |
1638 | dst0 = ERR_PTR(err); | |
1639 | goto out; | |
1640 | } | |
1641 | ||
da7c224b | 1642 | #ifdef CONFIG_XFRM_SUB_POLICY |
be7928d2 | 1643 | static int xfrm_dst_alloc_copy(void **target, const void *src, int size) |
157bfc25 MN |
1644 | { |
1645 | if (!*target) { | |
1646 | *target = kmalloc(size, GFP_ATOMIC); | |
1647 | if (!*target) | |
1648 | return -ENOMEM; | |
1649 | } | |
be7928d2 | 1650 | |
157bfc25 MN |
1651 | memcpy(*target, src, size); |
1652 | return 0; | |
1653 | } | |
da7c224b | 1654 | #endif |
157bfc25 | 1655 | |
be7928d2 DB |
1656 | static int xfrm_dst_update_parent(struct dst_entry *dst, |
1657 | 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 | ||
be7928d2 DB |
1668 | static int xfrm_dst_update_origin(struct dst_entry *dst, |
1669 | 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 | } | |
02d0892f | 1707 | (*num_pols)++; |
80c802f3 TT |
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; | |
3e94c2dc | 1761 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 TT |
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 | ||
aad88724 | 1845 | static int xdst_queue_output(struct sock *sk, struct sk_buff *skb) |
a0073fe1 SK |
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; | |
3e94c2dc | 2030 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 TT |
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 | ||
80c802f3 | 2110 | route = xdst->route; |
0aa64774 | 2111 | } |
3bccfbc7 | 2112 | } |
1da177e4 | 2113 | |
80c802f3 | 2114 | if (xdst == NULL) { |
1da177e4 | 2115 | /* To accelerate a bit... */ |
2518c7c2 | 2116 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 2117 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 2118 | goto nopol; |
1da177e4 | 2119 | |
80c802f3 TT |
2120 | flo = flow_cache_lookup(net, fl, family, dir, |
2121 | xfrm_bundle_lookup, dst_orig); | |
2122 | if (flo == NULL) | |
2123 | goto nopol; | |
fe1a5f03 | 2124 | if (IS_ERR(flo)) { |
80c802f3 | 2125 | err = PTR_ERR(flo); |
75b8c133 | 2126 | goto dropdst; |
d66e37a9 | 2127 | } |
80c802f3 TT |
2128 | xdst = container_of(flo, struct xfrm_dst, flo); |
2129 | ||
2130 | num_pols = xdst->num_pols; | |
2131 | num_xfrms = xdst->num_xfrms; | |
3e94c2dc | 2132 | memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols); |
80c802f3 TT |
2133 | route = xdst->route; |
2134 | } | |
2135 | ||
2136 | dst = &xdst->u.dst; | |
2137 | if (route == NULL && num_xfrms > 0) { | |
2138 | /* The only case when xfrm_bundle_lookup() returns a | |
2139 | * bundle with null route, is when the template could | |
2140 | * not be resolved. It means policies are there, but | |
2141 | * bundle could not be created, since we don't yet | |
2142 | * have the xfrm_state's. We need to wait for KM to | |
2143 | * negotiate new SA's or bail out with error.*/ | |
2144 | if (net->xfrm.sysctl_larval_drop) { | |
80c802f3 | 2145 | dst_release(dst); |
a1aa3483 | 2146 | xfrm_pols_put(pols, drop_pols); |
80c802f3 | 2147 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
2774c131 | 2148 | |
452edd59 | 2149 | return make_blackhole(net, family, dst_orig); |
80c802f3 | 2150 | } |
80c802f3 | 2151 | |
5b8ef341 | 2152 | err = -EAGAIN; |
80c802f3 TT |
2153 | |
2154 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); | |
2155 | goto error; | |
1da177e4 LT |
2156 | } |
2157 | ||
80c802f3 TT |
2158 | no_transform: |
2159 | if (num_pols == 0) | |
8b7817f3 | 2160 | goto nopol; |
1da177e4 | 2161 | |
80c802f3 TT |
2162 | if ((flags & XFRM_LOOKUP_ICMP) && |
2163 | !(pols[0]->flags & XFRM_POLICY_ICMP)) { | |
2164 | err = -ENOENT; | |
8b7817f3 | 2165 | goto error; |
80c802f3 | 2166 | } |
8b7817f3 | 2167 | |
80c802f3 TT |
2168 | for (i = 0; i < num_pols; i++) |
2169 | pols[i]->curlft.use_time = get_seconds(); | |
8b7817f3 | 2170 | |
80c802f3 | 2171 | if (num_xfrms < 0) { |
1da177e4 | 2172 | /* Prohibit the flow */ |
59c9940e | 2173 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
2174 | err = -EPERM; |
2175 | goto error; | |
80c802f3 TT |
2176 | } else if (num_xfrms > 0) { |
2177 | /* Flow transformed */ | |
80c802f3 TT |
2178 | dst_release(dst_orig); |
2179 | } else { | |
2180 | /* Flow passes untransformed */ | |
2181 | dst_release(dst); | |
452edd59 | 2182 | dst = dst_orig; |
1da177e4 | 2183 | } |
80c802f3 TT |
2184 | ok: |
2185 | xfrm_pols_put(pols, drop_pols); | |
0c183379 G |
2186 | if (dst && dst->xfrm && |
2187 | dst->xfrm->props.mode == XFRM_MODE_TUNNEL) | |
2188 | dst->flags |= DST_XFRM_TUNNEL; | |
452edd59 | 2189 | return dst; |
1da177e4 | 2190 | |
80c802f3 | 2191 | nopol: |
452edd59 DM |
2192 | if (!(flags & XFRM_LOOKUP_ICMP)) { |
2193 | dst = dst_orig; | |
80c802f3 | 2194 | goto ok; |
452edd59 | 2195 | } |
80c802f3 | 2196 | err = -ENOENT; |
1da177e4 | 2197 | error: |
80c802f3 | 2198 | dst_release(dst); |
75b8c133 HX |
2199 | dropdst: |
2200 | dst_release(dst_orig); | |
80c802f3 | 2201 | xfrm_pols_put(pols, drop_pols); |
452edd59 | 2202 | return ERR_PTR(err); |
1da177e4 LT |
2203 | } |
2204 | EXPORT_SYMBOL(xfrm_lookup); | |
2205 | ||
df0ba92a | 2206 | static inline int |
8f029de2 | 2207 | xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl) |
df0ba92a MN |
2208 | { |
2209 | struct xfrm_state *x; | |
df0ba92a MN |
2210 | |
2211 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
2212 | return 0; | |
2213 | x = skb->sp->xvec[idx]; | |
2214 | if (!x->type->reject) | |
2215 | return 0; | |
1ecafede | 2216 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
2217 | } |
2218 | ||
1da177e4 LT |
2219 | /* When skb is transformed back to its "native" form, we have to |
2220 | * check policy restrictions. At the moment we make this in maximally | |
2221 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
2222 | * have policy cached at them. | |
2223 | */ | |
2224 | ||
2225 | static inline int | |
7db454b9 | 2226 | xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, |
1da177e4 LT |
2227 | unsigned short family) |
2228 | { | |
2229 | if (xfrm_state_kern(x)) | |
928ba416 | 2230 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
2231 | return x->id.proto == tmpl->id.proto && |
2232 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
2233 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
2234 | x->props.mode == tmpl->mode && | |
c5d18e98 | 2235 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 2236 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
2237 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
2238 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
2239 | } |
2240 | ||
df0ba92a MN |
2241 | /* |
2242 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
2243 | * because of optional transport mode, or next index of the mathced secpath | |
2244 | * state with the template. | |
2245 | * -1 is returned when no matching template is found. | |
2246 | * Otherwise "-2 - errored_index" is returned. | |
2247 | */ | |
1da177e4 | 2248 | static inline int |
22cccb7e | 2249 | xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start, |
1da177e4 LT |
2250 | unsigned short family) |
2251 | { | |
2252 | int idx = start; | |
2253 | ||
2254 | if (tmpl->optional) { | |
7e49e6de | 2255 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
2256 | return start; |
2257 | } else | |
2258 | start = -1; | |
2259 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 2260 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 2261 | return ++idx; |
df0ba92a MN |
2262 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
2263 | if (start == -1) | |
2264 | start = -2-idx; | |
1da177e4 | 2265 | break; |
df0ba92a | 2266 | } |
1da177e4 LT |
2267 | } |
2268 | return start; | |
2269 | } | |
2270 | ||
d5422efe HX |
2271 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
2272 | unsigned int family, int reverse) | |
1da177e4 LT |
2273 | { |
2274 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 2275 | int err; |
1da177e4 LT |
2276 | |
2277 | if (unlikely(afinfo == NULL)) | |
2278 | return -EAFNOSUPPORT; | |
2279 | ||
d5422efe | 2280 | afinfo->decode_session(skb, fl, reverse); |
1d28f42c | 2281 | err = security_xfrm_decode_session(skb, &fl->flowi_secid); |
1da177e4 | 2282 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 2283 | return err; |
1da177e4 | 2284 | } |
d5422efe | 2285 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 2286 | |
9a7386ec | 2287 | static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
2288 | { |
2289 | for (; k < sp->len; k++) { | |
df0ba92a | 2290 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 2291 | *idxp = k; |
1da177e4 | 2292 | return 1; |
df0ba92a | 2293 | } |
1da177e4 LT |
2294 | } |
2295 | ||
2296 | return 0; | |
2297 | } | |
2298 | ||
a716c119 | 2299 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
2300 | unsigned short family) |
2301 | { | |
f6e1e25d | 2302 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2303 | struct xfrm_policy *pol; |
4e81bb83 MN |
2304 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2305 | int npols = 0; | |
2306 | int xfrm_nr; | |
2307 | int pi; | |
d5422efe | 2308 | int reverse; |
1da177e4 | 2309 | struct flowi fl; |
d5422efe | 2310 | u8 fl_dir; |
df0ba92a | 2311 | int xerr_idx = -1; |
1da177e4 | 2312 | |
d5422efe HX |
2313 | reverse = dir & ~XFRM_POLICY_MASK; |
2314 | dir &= XFRM_POLICY_MASK; | |
2315 | fl_dir = policy_to_flow_dir(dir); | |
2316 | ||
0aa64774 | 2317 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 2318 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 2319 | return 0; |
0aa64774 MN |
2320 | } |
2321 | ||
eb9c7ebe | 2322 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
2323 | |
2324 | /* First, check used SA against their selectors. */ | |
2325 | if (skb->sp) { | |
2326 | int i; | |
2327 | ||
9b7a787d | 2328 | for (i = skb->sp->len-1; i >= 0; i--) { |
dbe5b4aa | 2329 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 2330 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 2331 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 2332 | return 0; |
0aa64774 | 2333 | } |
1da177e4 LT |
2334 | } |
2335 | } | |
2336 | ||
2337 | pol = NULL; | |
3bccfbc7 | 2338 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 2339 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 2340 | if (IS_ERR(pol)) { |
59c9940e | 2341 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 2342 | return 0; |
0aa64774 | 2343 | } |
3bccfbc7 | 2344 | } |
1da177e4 | 2345 | |
fe1a5f03 TT |
2346 | if (!pol) { |
2347 | struct flow_cache_object *flo; | |
2348 | ||
2349 | flo = flow_cache_lookup(net, &fl, family, fl_dir, | |
2350 | xfrm_policy_lookup, NULL); | |
2351 | if (IS_ERR_OR_NULL(flo)) | |
2352 | pol = ERR_CAST(flo); | |
2353 | else | |
2354 | pol = container_of(flo, struct xfrm_policy, flo); | |
2355 | } | |
1da177e4 | 2356 | |
0aa64774 | 2357 | if (IS_ERR(pol)) { |
59c9940e | 2358 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2359 | return 0; |
0aa64774 | 2360 | } |
134b0fc5 | 2361 | |
df0ba92a | 2362 | if (!pol) { |
d1d9facf | 2363 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 2364 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 2365 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
2366 | return 0; |
2367 | } | |
2368 | return 1; | |
2369 | } | |
1da177e4 | 2370 | |
9d729f72 | 2371 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 2372 | |
4e81bb83 | 2373 | pols[0] = pol; |
02d0892f | 2374 | npols++; |
4e81bb83 MN |
2375 | #ifdef CONFIG_XFRM_SUB_POLICY |
2376 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 2377 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
2378 | &fl, family, |
2379 | XFRM_POLICY_IN); | |
2380 | if (pols[1]) { | |
0aa64774 | 2381 | if (IS_ERR(pols[1])) { |
59c9940e | 2382 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2383 | return 0; |
0aa64774 | 2384 | } |
9d729f72 | 2385 | pols[1]->curlft.use_time = get_seconds(); |
02d0892f | 2386 | npols++; |
4e81bb83 MN |
2387 | } |
2388 | } | |
2389 | #endif | |
2390 | ||
1da177e4 LT |
2391 | if (pol->action == XFRM_POLICY_ALLOW) { |
2392 | struct sec_path *sp; | |
2393 | static struct sec_path dummy; | |
4e81bb83 | 2394 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 2395 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
2396 | struct xfrm_tmpl **tpp = tp; |
2397 | int ti = 0; | |
1da177e4 LT |
2398 | int i, k; |
2399 | ||
2400 | if ((sp = skb->sp) == NULL) | |
2401 | sp = &dummy; | |
2402 | ||
4e81bb83 MN |
2403 | for (pi = 0; pi < npols; pi++) { |
2404 | if (pols[pi] != pol && | |
0aa64774 | 2405 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 2406 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 2407 | goto reject; |
0aa64774 MN |
2408 | } |
2409 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 2410 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 2411 | goto reject_error; |
0aa64774 | 2412 | } |
4e81bb83 MN |
2413 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2414 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2415 | } | |
2416 | xfrm_nr = ti; | |
41a49cc3 | 2417 | if (npols > 1) { |
283bc9f3 | 2418 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net); |
41a49cc3 MN |
2419 | tpp = stp; |
2420 | } | |
4e81bb83 | 2421 | |
1da177e4 LT |
2422 | /* For each tunnel xfrm, find the first matching tmpl. |
2423 | * For each tmpl before that, find corresponding xfrm. | |
2424 | * Order is _important_. Later we will implement | |
2425 | * some barriers, but at the moment barriers | |
2426 | * are implied between each two transformations. | |
2427 | */ | |
4e81bb83 MN |
2428 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2429 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2430 | if (k < 0) { |
d1d9facf JM |
2431 | if (k < -1) |
2432 | /* "-2 - errored_index" returned */ | |
2433 | xerr_idx = -(2+k); | |
59c9940e | 2434 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2435 | goto reject; |
df0ba92a | 2436 | } |
1da177e4 LT |
2437 | } |
2438 | ||
0aa64774 | 2439 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2440 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2441 | goto reject; |
0aa64774 | 2442 | } |
1da177e4 | 2443 | |
4e81bb83 | 2444 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2445 | return 1; |
2446 | } | |
59c9940e | 2447 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2448 | |
2449 | reject: | |
df0ba92a | 2450 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2451 | reject_error: |
2452 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2453 | return 0; |
2454 | } | |
2455 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2456 | ||
2457 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2458 | { | |
99a66657 | 2459 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2460 | struct flowi fl; |
adf30907 | 2461 | struct dst_entry *dst; |
73137147 | 2462 | int res = 1; |
1da177e4 | 2463 | |
0aa64774 | 2464 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
72032fdb | 2465 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
1da177e4 | 2466 | return 0; |
0aa64774 | 2467 | } |
1da177e4 | 2468 | |
fafeeb6c | 2469 | skb_dst_force(skb); |
adf30907 | 2470 | |
452edd59 DM |
2471 | dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, 0); |
2472 | if (IS_ERR(dst)) { | |
73137147 | 2473 | res = 0; |
452edd59 DM |
2474 | dst = NULL; |
2475 | } | |
adf30907 ED |
2476 | skb_dst_set(skb, dst); |
2477 | return res; | |
1da177e4 LT |
2478 | } |
2479 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2480 | ||
d49c73c7 DM |
2481 | /* Optimize later using cookies and generation ids. */ |
2482 | ||
1da177e4 LT |
2483 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2484 | { | |
d49c73c7 | 2485 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
f5b0a874 DM |
2486 | * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to |
2487 | * get validated by dst_ops->check on every use. We do this | |
2488 | * because when a normal route referenced by an XFRM dst is | |
2489 | * obsoleted we do not go looking around for all parent | |
2490 | * referencing XFRM dsts so that we can invalidate them. It | |
2491 | * is just too much work. Instead we make the checks here on | |
2492 | * every use. For example: | |
d49c73c7 DM |
2493 | * |
2494 | * XFRM dst A --> IPv4 dst X | |
2495 | * | |
2496 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2497 | * in this example). If X is marked obsolete, "A" will not | |
2498 | * notice. That's what we are validating here via the | |
2499 | * stale_bundle() check. | |
2500 | * | |
2501 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
f5b0a874 DM |
2502 | * dst which causes it's ->obsolete field to be set to |
2503 | * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like | |
2504 | * this, we want to force a new route lookup. | |
399c180a | 2505 | */ |
d49c73c7 DM |
2506 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2507 | return dst; | |
2508 | ||
1da177e4 LT |
2509 | return NULL; |
2510 | } | |
2511 | ||
2512 | static int stale_bundle(struct dst_entry *dst) | |
2513 | { | |
12fdb4d3 | 2514 | return !xfrm_bundle_ok((struct xfrm_dst *)dst); |
1da177e4 LT |
2515 | } |
2516 | ||
aabc9761 | 2517 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2518 | { |
1da177e4 | 2519 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2520 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2521 | dev_hold(dst->dev); |
1da177e4 LT |
2522 | dev_put(dev); |
2523 | } | |
2524 | } | |
aabc9761 | 2525 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2526 | |
2527 | static void xfrm_link_failure(struct sk_buff *skb) | |
2528 | { | |
2529 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1da177e4 LT |
2530 | } |
2531 | ||
2532 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2533 | { | |
2534 | if (dst) { | |
2535 | if (dst->obsolete) { | |
2536 | dst_release(dst); | |
2537 | dst = NULL; | |
2538 | } | |
2539 | } | |
2540 | return dst; | |
2541 | } | |
2542 | ||
e4c17216 | 2543 | void xfrm_garbage_collect(struct net *net) |
c0ed1c14 | 2544 | { |
ca925cf1 | 2545 | flow_cache_flush(net); |
c0ed1c14 | 2546 | } |
e4c17216 | 2547 | EXPORT_SYMBOL(xfrm_garbage_collect); |
c0ed1c14 SK |
2548 | |
2549 | static void xfrm_garbage_collect_deferred(struct net *net) | |
2550 | { | |
ca925cf1 | 2551 | flow_cache_flush_deferred(net); |
c0ed1c14 SK |
2552 | } |
2553 | ||
25ee3286 | 2554 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2555 | { |
2556 | do { | |
2557 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2558 | u32 pmtu, route_mtu_cached; | |
2559 | ||
2560 | pmtu = dst_mtu(dst->child); | |
2561 | xdst->child_mtu_cached = pmtu; | |
2562 | ||
2563 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2564 | ||
2565 | route_mtu_cached = dst_mtu(xdst->route); | |
2566 | xdst->route_mtu_cached = route_mtu_cached; | |
2567 | ||
2568 | if (pmtu > route_mtu_cached) | |
2569 | pmtu = route_mtu_cached; | |
2570 | ||
defb3519 | 2571 | dst_metric_set(dst, RTAX_MTU, pmtu); |
1da177e4 LT |
2572 | } while ((dst = dst->next)); |
2573 | } | |
2574 | ||
1da177e4 LT |
2575 | /* Check that the bundle accepts the flow and its components are |
2576 | * still valid. | |
2577 | */ | |
2578 | ||
12fdb4d3 | 2579 | static int xfrm_bundle_ok(struct xfrm_dst *first) |
1da177e4 LT |
2580 | { |
2581 | struct dst_entry *dst = &first->u.dst; | |
2582 | struct xfrm_dst *last; | |
2583 | u32 mtu; | |
2584 | ||
92d63dec | 2585 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2586 | (dst->dev && !netif_running(dst->dev))) |
2587 | return 0; | |
2588 | ||
a0073fe1 SK |
2589 | if (dst->flags & DST_XFRM_QUEUE) |
2590 | return 1; | |
2591 | ||
1da177e4 LT |
2592 | last = NULL; |
2593 | ||
2594 | do { | |
2595 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2596 | ||
1da177e4 LT |
2597 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2598 | return 0; | |
80c802f3 TT |
2599 | if (xdst->xfrm_genid != dst->xfrm->genid) |
2600 | return 0; | |
b1312c89 TT |
2601 | if (xdst->num_pols > 0 && |
2602 | xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) | |
9d4a706d | 2603 | return 0; |
e53820de | 2604 | |
1da177e4 LT |
2605 | mtu = dst_mtu(dst->child); |
2606 | if (xdst->child_mtu_cached != mtu) { | |
2607 | last = xdst; | |
2608 | xdst->child_mtu_cached = mtu; | |
2609 | } | |
2610 | ||
92d63dec | 2611 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2612 | return 0; |
2613 | mtu = dst_mtu(xdst->route); | |
2614 | if (xdst->route_mtu_cached != mtu) { | |
2615 | last = xdst; | |
2616 | xdst->route_mtu_cached = mtu; | |
2617 | } | |
2618 | ||
2619 | dst = dst->child; | |
2620 | } while (dst->xfrm); | |
2621 | ||
2622 | if (likely(!last)) | |
2623 | return 1; | |
2624 | ||
2625 | mtu = last->child_mtu_cached; | |
2626 | for (;;) { | |
2627 | dst = &last->u.dst; | |
2628 | ||
2629 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2630 | if (mtu > last->route_mtu_cached) | |
2631 | mtu = last->route_mtu_cached; | |
defb3519 | 2632 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
2633 | |
2634 | if (last == first) | |
2635 | break; | |
2636 | ||
bd0bf076 | 2637 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2638 | last->child_mtu_cached = mtu; |
2639 | } | |
2640 | ||
2641 | return 1; | |
2642 | } | |
2643 | ||
0dbaee3b DM |
2644 | static unsigned int xfrm_default_advmss(const struct dst_entry *dst) |
2645 | { | |
2646 | return dst_metric_advmss(dst->path); | |
2647 | } | |
2648 | ||
ebb762f2 | 2649 | static unsigned int xfrm_mtu(const struct dst_entry *dst) |
d33e4553 | 2650 | { |
618f9bc7 SK |
2651 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
2652 | ||
2653 | return mtu ? : dst_mtu(dst->path); | |
d33e4553 DM |
2654 | } |
2655 | ||
f894cbf8 DM |
2656 | static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, |
2657 | struct sk_buff *skb, | |
2658 | const void *daddr) | |
d3aaeb38 | 2659 | { |
f894cbf8 | 2660 | return dst->path->ops->neigh_lookup(dst, skb, daddr); |
d3aaeb38 DM |
2661 | } |
2662 | ||
1da177e4 LT |
2663 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2664 | { | |
d7c7544c | 2665 | struct net *net; |
1da177e4 LT |
2666 | int err = 0; |
2667 | if (unlikely(afinfo == NULL)) | |
2668 | return -EINVAL; | |
2669 | if (unlikely(afinfo->family >= NPROTO)) | |
2670 | return -EAFNOSUPPORT; | |
ef8531b6 | 2671 | spin_lock(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2672 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2673 | err = -ENOBUFS; | |
2674 | else { | |
2675 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2676 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2677 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2678 | if (likely(dst_ops->check == NULL)) | |
2679 | dst_ops->check = xfrm_dst_check; | |
0dbaee3b DM |
2680 | if (likely(dst_ops->default_advmss == NULL)) |
2681 | dst_ops->default_advmss = xfrm_default_advmss; | |
ebb762f2 SK |
2682 | if (likely(dst_ops->mtu == NULL)) |
2683 | dst_ops->mtu = xfrm_mtu; | |
1da177e4 LT |
2684 | if (likely(dst_ops->negative_advice == NULL)) |
2685 | dst_ops->negative_advice = xfrm_negative_advice; | |
2686 | if (likely(dst_ops->link_failure == NULL)) | |
2687 | dst_ops->link_failure = xfrm_link_failure; | |
d3aaeb38 DM |
2688 | if (likely(dst_ops->neigh_lookup == NULL)) |
2689 | dst_ops->neigh_lookup = xfrm_neigh_lookup; | |
1da177e4 | 2690 | if (likely(afinfo->garbage_collect == NULL)) |
c0ed1c14 | 2691 | afinfo->garbage_collect = xfrm_garbage_collect_deferred; |
418a99ac | 2692 | rcu_assign_pointer(xfrm_policy_afinfo[afinfo->family], afinfo); |
1da177e4 | 2693 | } |
ef8531b6 | 2694 | spin_unlock(&xfrm_policy_afinfo_lock); |
d7c7544c AD |
2695 | |
2696 | rtnl_lock(); | |
2697 | for_each_net(net) { | |
2698 | struct dst_ops *xfrm_dst_ops; | |
2699 | ||
2700 | switch (afinfo->family) { | |
2701 | case AF_INET: | |
2702 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; | |
2703 | break; | |
dfd56b8b | 2704 | #if IS_ENABLED(CONFIG_IPV6) |
d7c7544c AD |
2705 | case AF_INET6: |
2706 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; | |
2707 | break; | |
2708 | #endif | |
2709 | default: | |
2710 | BUG(); | |
2711 | } | |
2712 | *xfrm_dst_ops = *afinfo->dst_ops; | |
2713 | } | |
2714 | rtnl_unlock(); | |
2715 | ||
1da177e4 LT |
2716 | return err; |
2717 | } | |
2718 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2719 | ||
2720 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2721 | { | |
2722 | int err = 0; | |
2723 | if (unlikely(afinfo == NULL)) | |
2724 | return -EINVAL; | |
2725 | if (unlikely(afinfo->family >= NPROTO)) | |
2726 | return -EAFNOSUPPORT; | |
ef8531b6 | 2727 | spin_lock(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2728 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2729 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2730 | err = -EINVAL; | |
ef8531b6 ED |
2731 | else |
2732 | RCU_INIT_POINTER(xfrm_policy_afinfo[afinfo->family], | |
2733 | NULL); | |
2734 | } | |
2735 | spin_unlock(&xfrm_policy_afinfo_lock); | |
2736 | if (!err) { | |
2737 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2738 | ||
2739 | synchronize_rcu(); | |
2740 | ||
2741 | dst_ops->kmem_cachep = NULL; | |
2742 | dst_ops->check = NULL; | |
2743 | dst_ops->negative_advice = NULL; | |
2744 | dst_ops->link_failure = NULL; | |
2745 | afinfo->garbage_collect = NULL; | |
1da177e4 | 2746 | } |
1da177e4 LT |
2747 | return err; |
2748 | } | |
2749 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2750 | ||
d7c7544c AD |
2751 | static void __net_init xfrm_dst_ops_init(struct net *net) |
2752 | { | |
2753 | struct xfrm_policy_afinfo *afinfo; | |
2754 | ||
ef8531b6 ED |
2755 | rcu_read_lock(); |
2756 | afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET]); | |
d7c7544c AD |
2757 | if (afinfo) |
2758 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; | |
dfd56b8b | 2759 | #if IS_ENABLED(CONFIG_IPV6) |
ef8531b6 | 2760 | afinfo = rcu_dereference(xfrm_policy_afinfo[AF_INET6]); |
d7c7544c AD |
2761 | if (afinfo) |
2762 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; | |
2763 | #endif | |
418a99ac | 2764 | rcu_read_unlock(); |
546be240 HX |
2765 | } |
2766 | ||
1da177e4 LT |
2767 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2768 | { | |
351638e7 | 2769 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
e9dc8653 | 2770 | |
1da177e4 LT |
2771 | switch (event) { |
2772 | case NETDEV_DOWN: | |
c0ed1c14 | 2773 | xfrm_garbage_collect(dev_net(dev)); |
1da177e4 LT |
2774 | } |
2775 | return NOTIFY_DONE; | |
2776 | } | |
2777 | ||
2778 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2779 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2780 | }; |
2781 | ||
558f82ef | 2782 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2783 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2784 | { |
c68cd1a0 AD |
2785 | int rv; |
2786 | ||
7d720c3e | 2787 | if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics, |
1823e4c8 ED |
2788 | sizeof(struct linux_xfrm_mib), |
2789 | __alignof__(struct linux_xfrm_mib)) < 0) | |
558f82ef | 2790 | return -ENOMEM; |
c68cd1a0 AD |
2791 | rv = xfrm_proc_init(net); |
2792 | if (rv < 0) | |
7d720c3e | 2793 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
c68cd1a0 | 2794 | return rv; |
558f82ef | 2795 | } |
59c9940e AD |
2796 | |
2797 | static void xfrm_statistics_fini(struct net *net) | |
2798 | { | |
c68cd1a0 | 2799 | xfrm_proc_fini(net); |
7d720c3e | 2800 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
59c9940e AD |
2801 | } |
2802 | #else | |
2803 | static int __net_init xfrm_statistics_init(struct net *net) | |
2804 | { | |
2805 | return 0; | |
2806 | } | |
2807 | ||
2808 | static void xfrm_statistics_fini(struct net *net) | |
2809 | { | |
2810 | } | |
558f82ef MN |
2811 | #endif |
2812 | ||
d62ddc21 | 2813 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2814 | { |
2518c7c2 DM |
2815 | unsigned int hmask, sz; |
2816 | int dir; | |
2817 | ||
d62ddc21 AD |
2818 | if (net_eq(net, &init_net)) |
2819 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2820 | sizeof(struct xfrm_dst), |
e5d679f3 | 2821 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2822 | NULL); |
1da177e4 | 2823 | |
2518c7c2 DM |
2824 | hmask = 8 - 1; |
2825 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2826 | ||
93b851c1 AD |
2827 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2828 | if (!net->xfrm.policy_byidx) | |
2829 | goto out_byidx; | |
8100bea7 | 2830 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 DM |
2831 | |
2832 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2833 | struct xfrm_policy_hash *htab; | |
2834 | ||
dc2caba7 | 2835 | net->xfrm.policy_count[dir] = 0; |
8b18f8ea | 2836 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2837 | |
a35f6c5d | 2838 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2839 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2840 | if (!htab->table) |
a35f6c5d AD |
2841 | goto out_bydst; |
2842 | htab->hmask = hmask; | |
2518c7c2 DM |
2843 | } |
2844 | ||
adfcf0b2 | 2845 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2846 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
d62ddc21 AD |
2847 | if (net_eq(net, &init_net)) |
2848 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2849 | return 0; | |
93b851c1 | 2850 | |
a35f6c5d AD |
2851 | out_bydst: |
2852 | for (dir--; dir >= 0; dir--) { | |
2853 | struct xfrm_policy_hash *htab; | |
2854 | ||
2855 | htab = &net->xfrm.policy_bydst[dir]; | |
2856 | xfrm_hash_free(htab->table, sz); | |
2857 | } | |
2858 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
2859 | out_byidx: |
2860 | return -ENOMEM; | |
d62ddc21 AD |
2861 | } |
2862 | ||
2863 | static void xfrm_policy_fini(struct net *net) | |
2864 | { | |
7c2776ee | 2865 | struct xfrm_audit audit_info; |
93b851c1 | 2866 | unsigned int sz; |
8b18f8ea | 2867 | int dir; |
93b851c1 | 2868 | |
7c2776ee AD |
2869 | flush_work(&net->xfrm.policy_hash_work); |
2870 | #ifdef CONFIG_XFRM_SUB_POLICY | |
e1760bd5 | 2871 | audit_info.loginuid = INVALID_UID; |
4440e854 | 2872 | audit_info.sessionid = (unsigned int)-1; |
7c2776ee AD |
2873 | audit_info.secid = 0; |
2874 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); | |
2875 | #endif | |
e1760bd5 | 2876 | audit_info.loginuid = INVALID_UID; |
4440e854 | 2877 | audit_info.sessionid = (unsigned int)-1; |
7c2776ee AD |
2878 | audit_info.secid = 0; |
2879 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); | |
7c2776ee | 2880 | |
adfcf0b2 | 2881 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2882 | |
8b18f8ea | 2883 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
a35f6c5d AD |
2884 | struct xfrm_policy_hash *htab; |
2885 | ||
8b18f8ea | 2886 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
2887 | |
2888 | htab = &net->xfrm.policy_bydst[dir]; | |
5b653b2a | 2889 | sz = (htab->hmask + 1) * sizeof(struct hlist_head); |
a35f6c5d AD |
2890 | WARN_ON(!hlist_empty(htab->table)); |
2891 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
2892 | } |
2893 | ||
8100bea7 | 2894 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2895 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2896 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2897 | } |
2898 | ||
d62ddc21 AD |
2899 | static int __net_init xfrm_net_init(struct net *net) |
2900 | { | |
2901 | int rv; | |
2902 | ||
59c9940e AD |
2903 | rv = xfrm_statistics_init(net); |
2904 | if (rv < 0) | |
2905 | goto out_statistics; | |
d62ddc21 AD |
2906 | rv = xfrm_state_init(net); |
2907 | if (rv < 0) | |
2908 | goto out_state; | |
2909 | rv = xfrm_policy_init(net); | |
2910 | if (rv < 0) | |
2911 | goto out_policy; | |
d7c7544c | 2912 | xfrm_dst_ops_init(net); |
b27aeadb AD |
2913 | rv = xfrm_sysctl_init(net); |
2914 | if (rv < 0) | |
2915 | goto out_sysctl; | |
4a93f509 SK |
2916 | rv = flow_cache_init(net); |
2917 | if (rv < 0) | |
2918 | goto out; | |
283bc9f3 FD |
2919 | |
2920 | /* Initialize the per-net locks here */ | |
2921 | spin_lock_init(&net->xfrm.xfrm_state_lock); | |
2922 | rwlock_init(&net->xfrm.xfrm_policy_lock); | |
283bc9f3 FD |
2923 | mutex_init(&net->xfrm.xfrm_cfg_mutex); |
2924 | ||
d62ddc21 AD |
2925 | return 0; |
2926 | ||
4a93f509 SK |
2927 | out: |
2928 | xfrm_sysctl_fini(net); | |
b27aeadb AD |
2929 | out_sysctl: |
2930 | xfrm_policy_fini(net); | |
d62ddc21 AD |
2931 | out_policy: |
2932 | xfrm_state_fini(net); | |
2933 | out_state: | |
59c9940e AD |
2934 | xfrm_statistics_fini(net); |
2935 | out_statistics: | |
d62ddc21 AD |
2936 | return rv; |
2937 | } | |
2938 | ||
2939 | static void __net_exit xfrm_net_exit(struct net *net) | |
2940 | { | |
4a93f509 | 2941 | flow_cache_fini(net); |
b27aeadb | 2942 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
2943 | xfrm_policy_fini(net); |
2944 | xfrm_state_fini(net); | |
59c9940e | 2945 | xfrm_statistics_fini(net); |
d62ddc21 AD |
2946 | } |
2947 | ||
2948 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2949 | .init = xfrm_net_init, | |
2950 | .exit = xfrm_net_exit, | |
2951 | }; | |
2952 | ||
1da177e4 LT |
2953 | void __init xfrm_init(void) |
2954 | { | |
d62ddc21 | 2955 | register_pernet_subsys(&xfrm_net_ops); |
1da177e4 LT |
2956 | xfrm_input_init(); |
2957 | } | |
2958 | ||
ab5f5e8b | 2959 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2960 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2961 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2962 | { |
875179fa PM |
2963 | struct xfrm_sec_ctx *ctx = xp->security; |
2964 | struct xfrm_selector *sel = &xp->selector; | |
2965 | ||
2966 | if (ctx) | |
ab5f5e8b | 2967 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2968 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2969 | |
9b7a787d | 2970 | switch (sel->family) { |
ab5f5e8b | 2971 | case AF_INET: |
21454aaa | 2972 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2973 | if (sel->prefixlen_s != 32) |
2974 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2975 | sel->prefixlen_s); | |
21454aaa | 2976 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2977 | if (sel->prefixlen_d != 32) |
2978 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2979 | sel->prefixlen_d); | |
ab5f5e8b JL |
2980 | break; |
2981 | case AF_INET6: | |
5b095d98 | 2982 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2983 | if (sel->prefixlen_s != 128) |
2984 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2985 | sel->prefixlen_s); | |
5b095d98 | 2986 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2987 | if (sel->prefixlen_d != 128) |
2988 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2989 | sel->prefixlen_d); | |
ab5f5e8b JL |
2990 | break; |
2991 | } | |
2992 | } | |
2993 | ||
68277acc | 2994 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
4440e854 | 2995 | kuid_t auid, unsigned int sessionid, u32 secid) |
ab5f5e8b JL |
2996 | { |
2997 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2998 | |
afeb14b4 | 2999 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
3000 | if (audit_buf == NULL) |
3001 | return; | |
2532386f | 3002 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 3003 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
3004 | xfrm_audit_common_policyinfo(xp, audit_buf); |
3005 | audit_log_end(audit_buf); | |
3006 | } | |
3007 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
3008 | ||
68277acc | 3009 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
4440e854 | 3010 | kuid_t auid, unsigned int sessionid, u32 secid) |
ab5f5e8b JL |
3011 | { |
3012 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 3013 | |
afeb14b4 | 3014 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
3015 | if (audit_buf == NULL) |
3016 | return; | |
2532386f | 3017 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 3018 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
3019 | xfrm_audit_common_policyinfo(xp, audit_buf); |
3020 | audit_log_end(audit_buf); | |
3021 | } | |
3022 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
3023 | #endif | |
3024 | ||
80c9abaa | 3025 | #ifdef CONFIG_XFRM_MIGRATE |
bc9b35ad DM |
3026 | static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp, |
3027 | const struct xfrm_selector *sel_tgt) | |
80c9abaa SS |
3028 | { |
3029 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
3030 | if (sel_tgt->family == sel_cmp->family && | |
70e94e66 YH |
3031 | xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr, |
3032 | sel_cmp->family) && | |
3033 | xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr, | |
3034 | sel_cmp->family) && | |
80c9abaa SS |
3035 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && |
3036 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
bc9b35ad | 3037 | return true; |
80c9abaa SS |
3038 | } |
3039 | } else { | |
3040 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
bc9b35ad | 3041 | return true; |
80c9abaa SS |
3042 | } |
3043 | } | |
bc9b35ad | 3044 | return false; |
80c9abaa SS |
3045 | } |
3046 | ||
3e94c2dc WC |
3047 | static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel, |
3048 | u8 dir, u8 type, struct net *net) | |
80c9abaa SS |
3049 | { |
3050 | struct xfrm_policy *pol, *ret = NULL; | |
80c9abaa SS |
3051 | struct hlist_head *chain; |
3052 | u32 priority = ~0U; | |
3053 | ||
283bc9f3 | 3054 | read_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME*/ |
8d549c4f | 3055 | chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir); |
b67bfe0d | 3056 | hlist_for_each_entry(pol, chain, bydst) { |
80c9abaa SS |
3057 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
3058 | pol->type == type) { | |
3059 | ret = pol; | |
3060 | priority = ret->priority; | |
3061 | break; | |
3062 | } | |
3063 | } | |
8d549c4f | 3064 | chain = &net->xfrm.policy_inexact[dir]; |
b67bfe0d | 3065 | hlist_for_each_entry(pol, chain, bydst) { |
80c9abaa SS |
3066 | if (xfrm_migrate_selector_match(sel, &pol->selector) && |
3067 | pol->type == type && | |
3068 | pol->priority < priority) { | |
3069 | ret = pol; | |
3070 | break; | |
3071 | } | |
3072 | } | |
3073 | ||
3074 | if (ret) | |
3075 | xfrm_pol_hold(ret); | |
3076 | ||
283bc9f3 | 3077 | read_unlock_bh(&net->xfrm.xfrm_policy_lock); |
80c9abaa SS |
3078 | |
3079 | return ret; | |
3080 | } | |
3081 | ||
dd701754 | 3082 | static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t) |
80c9abaa SS |
3083 | { |
3084 | int match = 0; | |
3085 | ||
3086 | if (t->mode == m->mode && t->id.proto == m->proto && | |
3087 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
3088 | switch (t->mode) { | |
3089 | case XFRM_MODE_TUNNEL: | |
3090 | case XFRM_MODE_BEET: | |
70e94e66 YH |
3091 | if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr, |
3092 | m->old_family) && | |
3093 | xfrm_addr_equal(&t->saddr, &m->old_saddr, | |
3094 | m->old_family)) { | |
80c9abaa SS |
3095 | match = 1; |
3096 | } | |
3097 | break; | |
3098 | case XFRM_MODE_TRANSPORT: | |
3099 | /* in case of transport mode, template does not store | |
3100 | any IP addresses, hence we just compare mode and | |
3101 | protocol */ | |
3102 | match = 1; | |
3103 | break; | |
3104 | default: | |
3105 | break; | |
3106 | } | |
3107 | } | |
3108 | return match; | |
3109 | } | |
3110 | ||
3111 | /* update endpoint address(es) of template(s) */ | |
3112 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
3113 | struct xfrm_migrate *m, int num_migrate) | |
3114 | { | |
3115 | struct xfrm_migrate *mp; | |
80c9abaa SS |
3116 | int i, j, n = 0; |
3117 | ||
3118 | write_lock_bh(&pol->lock); | |
12a169e7 | 3119 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
3120 | /* target policy has been deleted */ |
3121 | write_unlock_bh(&pol->lock); | |
3122 | return -ENOENT; | |
3123 | } | |
3124 | ||
3125 | for (i = 0; i < pol->xfrm_nr; i++) { | |
3126 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
3127 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
3128 | continue; | |
3129 | n++; | |
1bfcb10f HX |
3130 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
3131 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
3132 | continue; |
3133 | /* update endpoints */ | |
3134 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
3135 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
3136 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
3137 | sizeof(pol->xfrm_vec[i].saddr)); | |
3138 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
3139 | /* flush bundles */ | |
80c802f3 | 3140 | atomic_inc(&pol->genid); |
80c9abaa SS |
3141 | } |
3142 | } | |
3143 | ||
3144 | write_unlock_bh(&pol->lock); | |
3145 | ||
3146 | if (!n) | |
3147 | return -ENODATA; | |
3148 | ||
3149 | return 0; | |
3150 | } | |
3151 | ||
dd701754 | 3152 | static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate) |
80c9abaa SS |
3153 | { |
3154 | int i, j; | |
3155 | ||
3156 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
3157 | return -EINVAL; | |
3158 | ||
3159 | for (i = 0; i < num_migrate; i++) { | |
70e94e66 YH |
3160 | if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr, |
3161 | m[i].old_family) && | |
3162 | xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr, | |
3163 | m[i].old_family)) | |
80c9abaa SS |
3164 | return -EINVAL; |
3165 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
3166 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
3167 | return -EINVAL; | |
3168 | ||
3169 | /* check if there is any duplicated entry */ | |
3170 | for (j = i + 1; j < num_migrate; j++) { | |
3171 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
3172 | sizeof(m[i].old_daddr)) && | |
3173 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
3174 | sizeof(m[i].old_saddr)) && | |
3175 | m[i].proto == m[j].proto && | |
3176 | m[i].mode == m[j].mode && | |
3177 | m[i].reqid == m[j].reqid && | |
3178 | m[i].old_family == m[j].old_family) | |
3179 | return -EINVAL; | |
3180 | } | |
3181 | } | |
3182 | ||
3183 | return 0; | |
3184 | } | |
3185 | ||
b4b7c0b3 | 3186 | int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 | 3187 | struct xfrm_migrate *m, int num_migrate, |
8d549c4f | 3188 | struct xfrm_kmaddress *k, struct net *net) |
80c9abaa SS |
3189 | { |
3190 | int i, err, nx_cur = 0, nx_new = 0; | |
3191 | struct xfrm_policy *pol = NULL; | |
3192 | struct xfrm_state *x, *xc; | |
3193 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
3194 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
3195 | struct xfrm_migrate *mp; | |
3196 | ||
3197 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
3198 | goto out; | |
3199 | ||
3200 | /* Stage 1 - find policy */ | |
8d549c4f | 3201 | if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) { |
80c9abaa SS |
3202 | err = -ENOENT; |
3203 | goto out; | |
3204 | } | |
3205 | ||
3206 | /* Stage 2 - find and update state(s) */ | |
3207 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
283bc9f3 | 3208 | if ((x = xfrm_migrate_state_find(mp, net))) { |
80c9abaa SS |
3209 | x_cur[nx_cur] = x; |
3210 | nx_cur++; | |
3211 | if ((xc = xfrm_state_migrate(x, mp))) { | |
3212 | x_new[nx_new] = xc; | |
3213 | nx_new++; | |
3214 | } else { | |
3215 | err = -ENODATA; | |
3216 | goto restore_state; | |
3217 | } | |
3218 | } | |
3219 | } | |
3220 | ||
3221 | /* Stage 3 - update policy */ | |
3222 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
3223 | goto restore_state; | |
3224 | ||
3225 | /* Stage 4 - delete old state(s) */ | |
3226 | if (nx_cur) { | |
3227 | xfrm_states_put(x_cur, nx_cur); | |
3228 | xfrm_states_delete(x_cur, nx_cur); | |
3229 | } | |
3230 | ||
3231 | /* Stage 5 - announce */ | |
13c1d189 | 3232 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
3233 | |
3234 | xfrm_pol_put(pol); | |
3235 | ||
3236 | return 0; | |
3237 | out: | |
3238 | return err; | |
3239 | ||
3240 | restore_state: | |
3241 | if (pol) | |
3242 | xfrm_pol_put(pol); | |
3243 | if (nx_cur) | |
3244 | xfrm_states_put(x_cur, nx_cur); | |
3245 | if (nx_new) | |
3246 | xfrm_states_delete(x_new, nx_new); | |
3247 | ||
3248 | return err; | |
3249 | } | |
e610e679 | 3250 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 3251 | #endif |