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> |
1da177e4 LT |
29 | #include <net/xfrm.h> |
30 | #include <net/ip.h> | |
558f82ef MN |
31 | #ifdef CONFIG_XFRM_STATISTICS |
32 | #include <net/snmp.h> | |
33 | #endif | |
1da177e4 | 34 | |
44e36b42 DM |
35 | #include "xfrm_hash.h" |
36 | ||
28faa979 | 37 | int sysctl_xfrm_larval_drop __read_mostly = 1; |
14e50e57 | 38 | |
558f82ef MN |
39 | #ifdef CONFIG_XFRM_STATISTICS |
40 | DEFINE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics) __read_mostly; | |
41 | EXPORT_SYMBOL(xfrm_statistics); | |
42 | #endif | |
43 | ||
4a3e2f71 AV |
44 | DEFINE_MUTEX(xfrm_cfg_mutex); |
45 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
1da177e4 LT |
46 | |
47 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
48 | ||
1da177e4 LT |
49 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); |
50 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
51 | ||
e18b890b | 52 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 | 53 | |
2518c7c2 | 54 | static HLIST_HEAD(xfrm_policy_gc_list); |
1da177e4 LT |
55 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); |
56 | ||
57 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
58 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
25ee3286 | 59 | static void xfrm_init_pmtu(struct dst_entry *dst); |
1da177e4 | 60 | |
77681021 AM |
61 | static inline int |
62 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
63 | { | |
64 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
65 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
66 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
67 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
68 | (fl->proto == sel->proto || !sel->proto) && | |
69 | (fl->oif == sel->ifindex || !sel->ifindex); | |
70 | } | |
71 | ||
72 | static inline int | |
73 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
74 | { | |
75 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
76 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
77 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
78 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
79 | (fl->proto == sel->proto || !sel->proto) && | |
80 | (fl->oif == sel->ifindex || !sel->ifindex); | |
81 | } | |
82 | ||
83 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
84 | unsigned short family) | |
85 | { | |
86 | switch (family) { | |
87 | case AF_INET: | |
88 | return __xfrm4_selector_match(sel, fl); | |
89 | case AF_INET6: | |
90 | return __xfrm6_selector_match(sel, fl); | |
91 | } | |
92 | return 0; | |
93 | } | |
94 | ||
c5b3cf46 | 95 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, |
9bb182a7 YH |
96 | xfrm_address_t *saddr, |
97 | xfrm_address_t *daddr, | |
98 | int family) | |
99 | { | |
100 | struct xfrm_policy_afinfo *afinfo; | |
101 | struct dst_entry *dst; | |
102 | ||
103 | afinfo = xfrm_policy_get_afinfo(family); | |
104 | if (unlikely(afinfo == NULL)) | |
105 | return ERR_PTR(-EAFNOSUPPORT); | |
106 | ||
c5b3cf46 | 107 | dst = afinfo->dst_lookup(net, tos, saddr, daddr); |
9bb182a7 YH |
108 | |
109 | xfrm_policy_put_afinfo(afinfo); | |
110 | ||
111 | return dst; | |
112 | } | |
113 | ||
25ee3286 | 114 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
9bb182a7 YH |
115 | xfrm_address_t *prev_saddr, |
116 | xfrm_address_t *prev_daddr, | |
25ee3286 | 117 | int family) |
1da177e4 | 118 | { |
c5b3cf46 | 119 | struct net *net = xs_net(x); |
66cdb3ca HX |
120 | xfrm_address_t *saddr = &x->props.saddr; |
121 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
122 | struct dst_entry *dst; |
123 | ||
9bb182a7 | 124 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 125 | saddr = x->coaddr; |
9bb182a7 YH |
126 | daddr = prev_daddr; |
127 | } | |
128 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
129 | saddr = prev_saddr; | |
66cdb3ca | 130 | daddr = x->coaddr; |
9bb182a7 | 131 | } |
1da177e4 | 132 | |
c5b3cf46 | 133 | dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family); |
9bb182a7 YH |
134 | |
135 | if (!IS_ERR(dst)) { | |
136 | if (prev_saddr != saddr) | |
137 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
138 | if (prev_daddr != daddr) | |
139 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
140 | } | |
1da177e4 | 141 | |
66cdb3ca | 142 | return dst; |
1da177e4 | 143 | } |
1da177e4 | 144 | |
1da177e4 LT |
145 | static inline unsigned long make_jiffies(long secs) |
146 | { | |
147 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
148 | return MAX_SCHEDULE_TIMEOUT-1; | |
149 | else | |
a716c119 | 150 | return secs*HZ; |
1da177e4 LT |
151 | } |
152 | ||
153 | static void xfrm_policy_timer(unsigned long data) | |
154 | { | |
155 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 156 | unsigned long now = get_seconds(); |
1da177e4 LT |
157 | long next = LONG_MAX; |
158 | int warn = 0; | |
159 | int dir; | |
160 | ||
161 | read_lock(&xp->lock); | |
162 | ||
12a169e7 | 163 | if (xp->walk.dead) |
1da177e4 LT |
164 | goto out; |
165 | ||
77d8d7a6 | 166 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
167 | |
168 | if (xp->lft.hard_add_expires_seconds) { | |
169 | long tmo = xp->lft.hard_add_expires_seconds + | |
170 | xp->curlft.add_time - now; | |
171 | if (tmo <= 0) | |
172 | goto expired; | |
173 | if (tmo < next) | |
174 | next = tmo; | |
175 | } | |
176 | if (xp->lft.hard_use_expires_seconds) { | |
177 | long tmo = xp->lft.hard_use_expires_seconds + | |
178 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
179 | if (tmo <= 0) | |
180 | goto expired; | |
181 | if (tmo < next) | |
182 | next = tmo; | |
183 | } | |
184 | if (xp->lft.soft_add_expires_seconds) { | |
185 | long tmo = xp->lft.soft_add_expires_seconds + | |
186 | xp->curlft.add_time - now; | |
187 | if (tmo <= 0) { | |
188 | warn = 1; | |
189 | tmo = XFRM_KM_TIMEOUT; | |
190 | } | |
191 | if (tmo < next) | |
192 | next = tmo; | |
193 | } | |
194 | if (xp->lft.soft_use_expires_seconds) { | |
195 | long tmo = xp->lft.soft_use_expires_seconds + | |
196 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
197 | if (tmo <= 0) { | |
198 | warn = 1; | |
199 | tmo = XFRM_KM_TIMEOUT; | |
200 | } | |
201 | if (tmo < next) | |
202 | next = tmo; | |
203 | } | |
204 | ||
205 | if (warn) | |
6c5c8ca7 | 206 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
207 | if (next != LONG_MAX && |
208 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
209 | xfrm_pol_hold(xp); | |
210 | ||
211 | out: | |
212 | read_unlock(&xp->lock); | |
213 | xfrm_pol_put(xp); | |
214 | return; | |
215 | ||
216 | expired: | |
217 | read_unlock(&xp->lock); | |
4666faab | 218 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 219 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
220 | xfrm_pol_put(xp); |
221 | } | |
222 | ||
223 | ||
224 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
225 | * SPD calls. | |
226 | */ | |
227 | ||
0331b1f3 | 228 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
229 | { |
230 | struct xfrm_policy *policy; | |
231 | ||
0da974f4 | 232 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
233 | |
234 | if (policy) { | |
0331b1f3 | 235 | write_pnet(&policy->xp_net, net); |
12a169e7 | 236 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
237 | INIT_HLIST_NODE(&policy->bydst); |
238 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 239 | rwlock_init(&policy->lock); |
2518c7c2 | 240 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
241 | setup_timer(&policy->timer, xfrm_policy_timer, |
242 | (unsigned long)policy); | |
1da177e4 LT |
243 | } |
244 | return policy; | |
245 | } | |
246 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
247 | ||
248 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
249 | ||
64c31b3f | 250 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 251 | { |
12a169e7 | 252 | BUG_ON(!policy->walk.dead); |
1da177e4 | 253 | |
09a62660 | 254 | BUG_ON(policy->bundles); |
1da177e4 LT |
255 | |
256 | if (del_timer(&policy->timer)) | |
257 | BUG(); | |
258 | ||
03e1ad7b | 259 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
260 | kfree(policy); |
261 | } | |
64c31b3f | 262 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 LT |
263 | |
264 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
265 | { | |
266 | struct dst_entry *dst; | |
267 | ||
268 | while ((dst = policy->bundles) != NULL) { | |
269 | policy->bundles = dst->next; | |
270 | dst_free(dst); | |
271 | } | |
272 | ||
273 | if (del_timer(&policy->timer)) | |
274 | atomic_dec(&policy->refcnt); | |
275 | ||
276 | if (atomic_read(&policy->refcnt) > 1) | |
277 | flow_cache_flush(); | |
278 | ||
279 | xfrm_pol_put(policy); | |
280 | } | |
281 | ||
c4028958 | 282 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
283 | { |
284 | struct xfrm_policy *policy; | |
2518c7c2 DM |
285 | struct hlist_node *entry, *tmp; |
286 | struct hlist_head gc_list; | |
1da177e4 LT |
287 | |
288 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
289 | gc_list.first = xfrm_policy_gc_list.first; |
290 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
291 | spin_unlock_bh(&xfrm_policy_gc_lock); |
292 | ||
2518c7c2 | 293 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 294 | xfrm_policy_gc_kill(policy); |
1da177e4 | 295 | } |
c9583969 | 296 | static DECLARE_WORK(xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
297 | |
298 | /* Rule must be locked. Release descentant resources, announce | |
299 | * entry dead. The rule must be unlinked from lists to the moment. | |
300 | */ | |
301 | ||
302 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
303 | { | |
304 | int dead; | |
305 | ||
306 | write_lock_bh(&policy->lock); | |
12a169e7 HX |
307 | dead = policy->walk.dead; |
308 | policy->walk.dead = 1; | |
1da177e4 LT |
309 | write_unlock_bh(&policy->lock); |
310 | ||
311 | if (unlikely(dead)) { | |
312 | WARN_ON(1); | |
313 | return; | |
314 | } | |
315 | ||
bbb770e7 | 316 | spin_lock_bh(&xfrm_policy_gc_lock); |
2518c7c2 | 317 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
bbb770e7 | 318 | spin_unlock_bh(&xfrm_policy_gc_lock); |
1da177e4 LT |
319 | |
320 | schedule_work(&xfrm_policy_gc_work); | |
321 | } | |
322 | ||
2518c7c2 DM |
323 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
324 | ||
e92303f8 | 325 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 326 | { |
e92303f8 | 327 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
328 | } |
329 | ||
1121994c | 330 | static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir) |
2518c7c2 | 331 | { |
1121994c | 332 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
333 | unsigned int hash = __sel_hash(sel, family, hmask); |
334 | ||
335 | return (hash == hmask + 1 ? | |
1121994c AD |
336 | &net->xfrm.policy_inexact[dir] : |
337 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
338 | } |
339 | ||
1121994c | 340 | static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) |
2518c7c2 | 341 | { |
1121994c | 342 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
343 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
344 | ||
1121994c | 345 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
346 | } |
347 | ||
2518c7c2 DM |
348 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
349 | struct hlist_head *ndsttable, | |
350 | unsigned int nhashmask) | |
351 | { | |
b791160b | 352 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 353 | struct xfrm_policy *pol; |
b791160b | 354 | unsigned int h0 = 0; |
2518c7c2 | 355 | |
b791160b | 356 | redo: |
2518c7c2 DM |
357 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
358 | unsigned int h; | |
359 | ||
360 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
361 | pol->family, nhashmask); | |
b791160b YH |
362 | if (!entry0) { |
363 | hlist_del(entry); | |
364 | hlist_add_head(&pol->bydst, ndsttable+h); | |
365 | h0 = h; | |
366 | } else { | |
367 | if (h != h0) | |
368 | continue; | |
369 | hlist_del(entry); | |
370 | hlist_add_after(entry0, &pol->bydst); | |
371 | } | |
372 | entry0 = entry; | |
373 | } | |
374 | if (!hlist_empty(list)) { | |
375 | entry0 = NULL; | |
376 | goto redo; | |
2518c7c2 DM |
377 | } |
378 | } | |
379 | ||
380 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
381 | struct hlist_head *nidxtable, | |
382 | unsigned int nhashmask) | |
383 | { | |
384 | struct hlist_node *entry, *tmp; | |
385 | struct xfrm_policy *pol; | |
386 | ||
387 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
388 | unsigned int h; | |
389 | ||
390 | h = __idx_hash(pol->index, nhashmask); | |
391 | hlist_add_head(&pol->byidx, nidxtable+h); | |
392 | } | |
393 | } | |
394 | ||
395 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
396 | { | |
397 | return ((old_hmask + 1) << 1) - 1; | |
398 | } | |
399 | ||
66caf628 | 400 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 401 | { |
66caf628 | 402 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
403 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
404 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 405 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 406 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
407 | int i; |
408 | ||
409 | if (!ndst) | |
410 | return; | |
411 | ||
412 | write_lock_bh(&xfrm_policy_lock); | |
413 | ||
414 | for (i = hmask; i >= 0; i--) | |
415 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
416 | ||
66caf628 AD |
417 | net->xfrm.policy_bydst[dir].table = ndst; |
418 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 DM |
419 | |
420 | write_unlock_bh(&xfrm_policy_lock); | |
421 | ||
44e36b42 | 422 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
423 | } |
424 | ||
66caf628 | 425 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 426 | { |
66caf628 | 427 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
428 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
429 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 430 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 431 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
432 | int i; |
433 | ||
434 | if (!nidx) | |
435 | return; | |
436 | ||
437 | write_lock_bh(&xfrm_policy_lock); | |
438 | ||
439 | for (i = hmask; i >= 0; i--) | |
440 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
441 | ||
66caf628 AD |
442 | net->xfrm.policy_byidx = nidx; |
443 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 DM |
444 | |
445 | write_unlock_bh(&xfrm_policy_lock); | |
446 | ||
44e36b42 | 447 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
448 | } |
449 | ||
66caf628 | 450 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 451 | { |
66caf628 AD |
452 | unsigned int cnt = net->xfrm.policy_count[dir]; |
453 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
454 | |
455 | if (total) | |
456 | *total += cnt; | |
457 | ||
458 | if ((hmask + 1) < xfrm_policy_hashmax && | |
459 | cnt > hmask) | |
460 | return 1; | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
66caf628 | 465 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 466 | { |
66caf628 | 467 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
468 | |
469 | if ((hmask + 1) < xfrm_policy_hashmax && | |
470 | total > hmask) | |
471 | return 1; | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
5a6d3416 | 476 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
477 | { |
478 | read_lock_bh(&xfrm_policy_lock); | |
dc2caba7 AD |
479 | si->incnt = init_net.xfrm.policy_count[XFRM_POLICY_IN]; |
480 | si->outcnt = init_net.xfrm.policy_count[XFRM_POLICY_OUT]; | |
481 | si->fwdcnt = init_net.xfrm.policy_count[XFRM_POLICY_FWD]; | |
482 | si->inscnt = init_net.xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
483 | si->outscnt = init_net.xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
484 | si->fwdscnt = init_net.xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
8100bea7 | 485 | si->spdhcnt = init_net.xfrm.policy_idx_hmask; |
ecfd6b18 JHS |
486 | si->spdhmcnt = xfrm_policy_hashmax; |
487 | read_unlock_bh(&xfrm_policy_lock); | |
488 | } | |
489 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 490 | |
ecfd6b18 | 491 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 492 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 493 | { |
66caf628 | 494 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
495 | int dir, total; |
496 | ||
497 | mutex_lock(&hash_resize_mutex); | |
498 | ||
499 | total = 0; | |
500 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
66caf628 AD |
501 | if (xfrm_bydst_should_resize(net, dir, &total)) |
502 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 503 | } |
66caf628 AD |
504 | if (xfrm_byidx_should_resize(net, total)) |
505 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
506 | |
507 | mutex_unlock(&hash_resize_mutex); | |
508 | } | |
509 | ||
1da177e4 LT |
510 | /* Generate new index... KAME seems to generate them ordered by cost |
511 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
1121994c | 512 | static u32 xfrm_gen_index(struct net *net, int dir) |
1da177e4 | 513 | { |
1da177e4 LT |
514 | static u32 idx_generator; |
515 | ||
516 | for (;;) { | |
2518c7c2 DM |
517 | struct hlist_node *entry; |
518 | struct hlist_head *list; | |
519 | struct xfrm_policy *p; | |
520 | u32 idx; | |
521 | int found; | |
522 | ||
1da177e4 LT |
523 | idx = (idx_generator | dir); |
524 | idx_generator += 8; | |
525 | if (idx == 0) | |
526 | idx = 8; | |
1121994c | 527 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 DM |
528 | found = 0; |
529 | hlist_for_each_entry(p, entry, list, byidx) { | |
530 | if (p->index == idx) { | |
531 | found = 1; | |
1da177e4 | 532 | break; |
2518c7c2 | 533 | } |
1da177e4 | 534 | } |
2518c7c2 | 535 | if (!found) |
1da177e4 LT |
536 | return idx; |
537 | } | |
538 | } | |
539 | ||
2518c7c2 DM |
540 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
541 | { | |
542 | u32 *p1 = (u32 *) s1; | |
543 | u32 *p2 = (u32 *) s2; | |
544 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
545 | int i; | |
546 | ||
547 | for (i = 0; i < len; i++) { | |
548 | if (p1[i] != p2[i]) | |
549 | return 1; | |
550 | } | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
1da177e4 LT |
555 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
556 | { | |
1121994c | 557 | struct net *net = xp_net(policy); |
2518c7c2 DM |
558 | struct xfrm_policy *pol; |
559 | struct xfrm_policy *delpol; | |
560 | struct hlist_head *chain; | |
a6c7ab55 | 561 | struct hlist_node *entry, *newpos; |
9b78a82c | 562 | struct dst_entry *gc_list; |
1da177e4 LT |
563 | |
564 | write_lock_bh(&xfrm_policy_lock); | |
1121994c | 565 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
566 | delpol = NULL; |
567 | newpos = NULL; | |
2518c7c2 | 568 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 569 | if (pol->type == policy->type && |
2518c7c2 | 570 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
571 | xfrm_sec_ctx_match(pol->security, policy->security) && |
572 | !WARN_ON(delpol)) { | |
1da177e4 LT |
573 | if (excl) { |
574 | write_unlock_bh(&xfrm_policy_lock); | |
575 | return -EEXIST; | |
576 | } | |
1da177e4 LT |
577 | delpol = pol; |
578 | if (policy->priority > pol->priority) | |
579 | continue; | |
580 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 581 | newpos = &pol->bydst; |
1da177e4 LT |
582 | continue; |
583 | } | |
1da177e4 LT |
584 | if (delpol) |
585 | break; | |
1da177e4 LT |
586 | } |
587 | if (newpos) | |
2518c7c2 DM |
588 | hlist_add_after(newpos, &policy->bydst); |
589 | else | |
590 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 591 | xfrm_pol_hold(policy); |
1121994c | 592 | net->xfrm.policy_count[dir]++; |
1da177e4 | 593 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
594 | if (delpol) { |
595 | hlist_del(&delpol->bydst); | |
596 | hlist_del(&delpol->byidx); | |
12a169e7 | 597 | list_del(&delpol->walk.all); |
1121994c | 598 | net->xfrm.policy_count[dir]--; |
2518c7c2 | 599 | } |
1121994c AD |
600 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir); |
601 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); | |
9d729f72 | 602 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
603 | policy->curlft.use_time = 0; |
604 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
605 | xfrm_pol_hold(policy); | |
1121994c | 606 | list_add(&policy->walk.all, &net->xfrm.policy_all); |
1da177e4 LT |
607 | write_unlock_bh(&xfrm_policy_lock); |
608 | ||
9b78a82c | 609 | if (delpol) |
1da177e4 | 610 | xfrm_policy_kill(delpol); |
1121994c AD |
611 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
612 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c DM |
613 | |
614 | read_lock_bh(&xfrm_policy_lock); | |
615 | gc_list = NULL; | |
2518c7c2 DM |
616 | entry = &policy->bydst; |
617 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
618 | struct dst_entry *dst; |
619 | ||
620 | write_lock(&policy->lock); | |
621 | dst = policy->bundles; | |
622 | if (dst) { | |
623 | struct dst_entry *tail = dst; | |
624 | while (tail->next) | |
625 | tail = tail->next; | |
626 | tail->next = gc_list; | |
627 | gc_list = dst; | |
628 | ||
629 | policy->bundles = NULL; | |
630 | } | |
631 | write_unlock(&policy->lock); | |
1da177e4 | 632 | } |
9b78a82c DM |
633 | read_unlock_bh(&xfrm_policy_lock); |
634 | ||
635 | while (gc_list) { | |
636 | struct dst_entry *dst = gc_list; | |
637 | ||
638 | gc_list = dst->next; | |
639 | dst_free(dst); | |
640 | } | |
641 | ||
1da177e4 LT |
642 | return 0; |
643 | } | |
644 | EXPORT_SYMBOL(xfrm_policy_insert); | |
645 | ||
8d1211a6 | 646 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u8 type, int dir, |
4e81bb83 | 647 | struct xfrm_selector *sel, |
ef41aaa0 EP |
648 | struct xfrm_sec_ctx *ctx, int delete, |
649 | int *err) | |
1da177e4 | 650 | { |
2518c7c2 DM |
651 | struct xfrm_policy *pol, *ret; |
652 | struct hlist_head *chain; | |
653 | struct hlist_node *entry; | |
1da177e4 | 654 | |
ef41aaa0 | 655 | *err = 0; |
1da177e4 | 656 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 657 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 DM |
658 | ret = NULL; |
659 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
660 | if (pol->type == type && | |
661 | !selector_cmp(sel, &pol->selector) && | |
662 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 663 | xfrm_pol_hold(pol); |
2518c7c2 | 664 | if (delete) { |
03e1ad7b PM |
665 | *err = security_xfrm_policy_delete( |
666 | pol->security); | |
ef41aaa0 EP |
667 | if (*err) { |
668 | write_unlock_bh(&xfrm_policy_lock); | |
669 | return pol; | |
670 | } | |
2518c7c2 DM |
671 | hlist_del(&pol->bydst); |
672 | hlist_del(&pol->byidx); | |
12a169e7 | 673 | list_del(&pol->walk.all); |
8d1211a6 | 674 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
675 | } |
676 | ret = pol; | |
1da177e4 LT |
677 | break; |
678 | } | |
679 | } | |
680 | write_unlock_bh(&xfrm_policy_lock); | |
681 | ||
2518c7c2 | 682 | if (ret && delete) { |
1da177e4 | 683 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 684 | xfrm_policy_kill(ret); |
1da177e4 | 685 | } |
2518c7c2 | 686 | return ret; |
1da177e4 | 687 | } |
df71837d | 688 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 689 | |
8d1211a6 AD |
690 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u8 type, int dir, u32 id, |
691 | int delete, int *err) | |
1da177e4 | 692 | { |
2518c7c2 DM |
693 | struct xfrm_policy *pol, *ret; |
694 | struct hlist_head *chain; | |
695 | struct hlist_node *entry; | |
1da177e4 | 696 | |
b5505c6e HX |
697 | *err = -ENOENT; |
698 | if (xfrm_policy_id2dir(id) != dir) | |
699 | return NULL; | |
700 | ||
ef41aaa0 | 701 | *err = 0; |
1da177e4 | 702 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 703 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 DM |
704 | ret = NULL; |
705 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
706 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 707 | xfrm_pol_hold(pol); |
2518c7c2 | 708 | if (delete) { |
03e1ad7b PM |
709 | *err = security_xfrm_policy_delete( |
710 | pol->security); | |
ef41aaa0 EP |
711 | if (*err) { |
712 | write_unlock_bh(&xfrm_policy_lock); | |
713 | return pol; | |
714 | } | |
2518c7c2 DM |
715 | hlist_del(&pol->bydst); |
716 | hlist_del(&pol->byidx); | |
12a169e7 | 717 | list_del(&pol->walk.all); |
8d1211a6 | 718 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
719 | } |
720 | ret = pol; | |
1da177e4 LT |
721 | break; |
722 | } | |
723 | } | |
724 | write_unlock_bh(&xfrm_policy_lock); | |
725 | ||
2518c7c2 | 726 | if (ret && delete) { |
1da177e4 | 727 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 728 | xfrm_policy_kill(ret); |
1da177e4 | 729 | } |
2518c7c2 | 730 | return ret; |
1da177e4 LT |
731 | } |
732 | EXPORT_SYMBOL(xfrm_policy_byid); | |
733 | ||
4aa2e62c JL |
734 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
735 | static inline int | |
33ffbbd5 | 736 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 737 | { |
4aa2e62c JL |
738 | int dir, err = 0; |
739 | ||
740 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
741 | struct xfrm_policy *pol; | |
742 | struct hlist_node *entry; | |
743 | int i; | |
744 | ||
745 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 746 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
747 | if (pol->type != type) |
748 | continue; | |
03e1ad7b | 749 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 750 | if (err) { |
ab5f5e8b JL |
751 | xfrm_audit_policy_delete(pol, 0, |
752 | audit_info->loginuid, | |
2532386f | 753 | audit_info->sessionid, |
ab5f5e8b | 754 | audit_info->secid); |
4aa2e62c JL |
755 | return err; |
756 | } | |
7dc12d6d | 757 | } |
33ffbbd5 | 758 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
4aa2e62c | 759 | hlist_for_each_entry(pol, entry, |
33ffbbd5 | 760 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
761 | bydst) { |
762 | if (pol->type != type) | |
763 | continue; | |
03e1ad7b PM |
764 | err = security_xfrm_policy_delete( |
765 | pol->security); | |
4aa2e62c | 766 | if (err) { |
ab5f5e8b JL |
767 | xfrm_audit_policy_delete(pol, 0, |
768 | audit_info->loginuid, | |
2532386f | 769 | audit_info->sessionid, |
ab5f5e8b | 770 | audit_info->secid); |
4aa2e62c JL |
771 | return err; |
772 | } | |
773 | } | |
774 | } | |
775 | } | |
776 | return err; | |
777 | } | |
778 | #else | |
779 | static inline int | |
33ffbbd5 | 780 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
781 | { |
782 | return 0; | |
783 | } | |
784 | #endif | |
785 | ||
33ffbbd5 | 786 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
787 | { |
788 | int dir, err = 0; | |
1da177e4 LT |
789 | |
790 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c | 791 | |
33ffbbd5 | 792 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
4aa2e62c JL |
793 | if (err) |
794 | goto out; | |
795 | ||
1da177e4 | 796 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
797 | struct xfrm_policy *pol; |
798 | struct hlist_node *entry; | |
ae8c0577 | 799 | int i, killed; |
2518c7c2 | 800 | |
ae8c0577 | 801 | killed = 0; |
2518c7c2 DM |
802 | again1: |
803 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 804 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
805 | if (pol->type != type) |
806 | continue; | |
807 | hlist_del(&pol->bydst); | |
808 | hlist_del(&pol->byidx); | |
1da177e4 LT |
809 | write_unlock_bh(&xfrm_policy_lock); |
810 | ||
ab5f5e8b | 811 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 812 | audit_info->sessionid, |
ab5f5e8b | 813 | audit_info->secid); |
161a09e7 | 814 | |
2518c7c2 | 815 | xfrm_policy_kill(pol); |
ae8c0577 | 816 | killed++; |
1da177e4 LT |
817 | |
818 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
819 | goto again1; |
820 | } | |
821 | ||
33ffbbd5 | 822 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 DM |
823 | again2: |
824 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 825 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
826 | bydst) { |
827 | if (pol->type != type) | |
828 | continue; | |
829 | hlist_del(&pol->bydst); | |
830 | hlist_del(&pol->byidx); | |
12a169e7 | 831 | list_del(&pol->walk.all); |
2518c7c2 DM |
832 | write_unlock_bh(&xfrm_policy_lock); |
833 | ||
ab5f5e8b JL |
834 | xfrm_audit_policy_delete(pol, 1, |
835 | audit_info->loginuid, | |
2532386f | 836 | audit_info->sessionid, |
ab5f5e8b | 837 | audit_info->secid); |
2518c7c2 | 838 | xfrm_policy_kill(pol); |
ae8c0577 | 839 | killed++; |
2518c7c2 DM |
840 | |
841 | write_lock_bh(&xfrm_policy_lock); | |
842 | goto again2; | |
843 | } | |
1da177e4 | 844 | } |
2518c7c2 | 845 | |
33ffbbd5 | 846 | net->xfrm.policy_count[dir] -= killed; |
1da177e4 LT |
847 | } |
848 | atomic_inc(&flow_cache_genid); | |
4aa2e62c | 849 | out: |
1da177e4 | 850 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 851 | return err; |
1da177e4 LT |
852 | } |
853 | EXPORT_SYMBOL(xfrm_policy_flush); | |
854 | ||
cdcbca7c | 855 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 856 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
857 | void *data) |
858 | { | |
12a169e7 HX |
859 | struct xfrm_policy *pol; |
860 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
861 | int error = 0; |
862 | ||
863 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
864 | walk->type != XFRM_POLICY_TYPE_ANY) | |
865 | return -EINVAL; | |
1da177e4 | 866 | |
12a169e7 | 867 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
868 | return 0; |
869 | ||
12a169e7 HX |
870 | write_lock_bh(&xfrm_policy_lock); |
871 | if (list_empty(&walk->walk.all)) | |
cdcbca7c | 872 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
873 | else |
874 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
cdcbca7c | 875 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 876 | if (x->dead) |
4c563f76 | 877 | continue; |
12a169e7 HX |
878 | pol = container_of(x, struct xfrm_policy, walk); |
879 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
880 | walk->type != pol->type) | |
881 | continue; | |
882 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
883 | walk->seq, data); | |
884 | if (error) { | |
885 | list_move_tail(&walk->walk.all, &x->all); | |
886 | goto out; | |
2518c7c2 | 887 | } |
12a169e7 | 888 | walk->seq++; |
1da177e4 | 889 | } |
12a169e7 | 890 | if (walk->seq == 0) { |
baf5d743 JHS |
891 | error = -ENOENT; |
892 | goto out; | |
893 | } | |
12a169e7 | 894 | list_del_init(&walk->walk.all); |
1da177e4 | 895 | out: |
12a169e7 | 896 | write_unlock_bh(&xfrm_policy_lock); |
1da177e4 LT |
897 | return error; |
898 | } | |
899 | EXPORT_SYMBOL(xfrm_policy_walk); | |
900 | ||
12a169e7 HX |
901 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
902 | { | |
903 | INIT_LIST_HEAD(&walk->walk.all); | |
904 | walk->walk.dead = 1; | |
905 | walk->type = type; | |
906 | walk->seq = 0; | |
907 | } | |
908 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
909 | ||
910 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
911 | { | |
912 | if (list_empty(&walk->walk.all)) | |
913 | return; | |
914 | ||
915 | write_lock_bh(&xfrm_policy_lock); | |
916 | list_del(&walk->walk.all); | |
917 | write_unlock_bh(&xfrm_policy_lock); | |
918 | } | |
919 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
920 | ||
134b0fc5 JM |
921 | /* |
922 | * Find policy to apply to this flow. | |
923 | * | |
924 | * Returns 0 if policy found, else an -errno. | |
925 | */ | |
2518c7c2 DM |
926 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
927 | u8 type, u16 family, int dir) | |
1da177e4 | 928 | { |
2518c7c2 | 929 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 930 | int match, ret = -ESRCH; |
1da177e4 | 931 | |
2518c7c2 DM |
932 | if (pol->family != family || |
933 | pol->type != type) | |
134b0fc5 | 934 | return ret; |
1da177e4 | 935 | |
2518c7c2 | 936 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 937 | if (match) |
03e1ad7b PM |
938 | ret = security_xfrm_policy_lookup(pol->security, fl->secid, |
939 | dir); | |
2518c7c2 | 940 | |
134b0fc5 | 941 | return ret; |
2518c7c2 | 942 | } |
1da177e4 | 943 | |
52479b62 AD |
944 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
945 | struct flowi *fl, | |
2518c7c2 DM |
946 | u16 family, u8 dir) |
947 | { | |
134b0fc5 | 948 | int err; |
2518c7c2 DM |
949 | struct xfrm_policy *pol, *ret; |
950 | xfrm_address_t *daddr, *saddr; | |
951 | struct hlist_node *entry; | |
952 | struct hlist_head *chain; | |
acba48e1 | 953 | u32 priority = ~0U; |
df71837d | 954 | |
2518c7c2 DM |
955 | daddr = xfrm_flowi_daddr(fl, family); |
956 | saddr = xfrm_flowi_saddr(fl, family); | |
957 | if (unlikely(!daddr || !saddr)) | |
958 | return NULL; | |
959 | ||
960 | read_lock_bh(&xfrm_policy_lock); | |
52479b62 | 961 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 DM |
962 | ret = NULL; |
963 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
964 | err = xfrm_policy_match(pol, fl, type, family, dir); |
965 | if (err) { | |
966 | if (err == -ESRCH) | |
967 | continue; | |
968 | else { | |
969 | ret = ERR_PTR(err); | |
970 | goto fail; | |
971 | } | |
972 | } else { | |
2518c7c2 | 973 | ret = pol; |
acba48e1 | 974 | priority = ret->priority; |
2518c7c2 DM |
975 | break; |
976 | } | |
977 | } | |
52479b62 | 978 | chain = &net->xfrm.policy_inexact[dir]; |
acba48e1 | 979 | hlist_for_each_entry(pol, entry, chain, bydst) { |
134b0fc5 JM |
980 | err = xfrm_policy_match(pol, fl, type, family, dir); |
981 | if (err) { | |
982 | if (err == -ESRCH) | |
983 | continue; | |
984 | else { | |
985 | ret = ERR_PTR(err); | |
986 | goto fail; | |
987 | } | |
988 | } else if (pol->priority < priority) { | |
acba48e1 DM |
989 | ret = pol; |
990 | break; | |
1da177e4 LT |
991 | } |
992 | } | |
acba48e1 DM |
993 | if (ret) |
994 | xfrm_pol_hold(ret); | |
134b0fc5 | 995 | fail: |
1da177e4 | 996 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 997 | |
2518c7c2 | 998 | return ret; |
4e81bb83 MN |
999 | } |
1000 | ||
52479b62 AD |
1001 | static int xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, |
1002 | u8 dir, void **objp, atomic_t **obj_refp) | |
4e81bb83 MN |
1003 | { |
1004 | struct xfrm_policy *pol; | |
134b0fc5 | 1005 | int err = 0; |
4e81bb83 MN |
1006 | |
1007 | #ifdef CONFIG_XFRM_SUB_POLICY | |
52479b62 | 1008 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); |
134b0fc5 JM |
1009 | if (IS_ERR(pol)) { |
1010 | err = PTR_ERR(pol); | |
1011 | pol = NULL; | |
1012 | } | |
1013 | if (pol || err) | |
4e81bb83 MN |
1014 | goto end; |
1015 | #endif | |
52479b62 | 1016 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); |
134b0fc5 JM |
1017 | if (IS_ERR(pol)) { |
1018 | err = PTR_ERR(pol); | |
1019 | pol = NULL; | |
1020 | } | |
4e81bb83 | 1021 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1022 | end: |
4e81bb83 | 1023 | #endif |
1da177e4 LT |
1024 | if ((*objp = (void *) pol) != NULL) |
1025 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1026 | return err; |
1da177e4 LT |
1027 | } |
1028 | ||
df71837d TJ |
1029 | static inline int policy_to_flow_dir(int dir) |
1030 | { | |
1031 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1032 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1033 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1034 | return dir; | |
1035 | switch (dir) { | |
1036 | default: | |
1037 | case XFRM_POLICY_IN: | |
1038 | return FLOW_DIR_IN; | |
1039 | case XFRM_POLICY_OUT: | |
1040 | return FLOW_DIR_OUT; | |
1041 | case XFRM_POLICY_FWD: | |
1042 | return FLOW_DIR_FWD; | |
3ff50b79 | 1043 | } |
df71837d TJ |
1044 | } |
1045 | ||
e0d1caa7 | 1046 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1047 | { |
1048 | struct xfrm_policy *pol; | |
1049 | ||
1050 | read_lock_bh(&xfrm_policy_lock); | |
1051 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1052 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1053 | sk->sk_family); |
a716c119 | 1054 | int err = 0; |
df71837d | 1055 | |
3bccfbc7 | 1056 | if (match) { |
03e1ad7b PM |
1057 | err = security_xfrm_policy_lookup(pol->security, |
1058 | fl->secid, | |
1059 | policy_to_flow_dir(dir)); | |
3bccfbc7 VY |
1060 | if (!err) |
1061 | xfrm_pol_hold(pol); | |
1062 | else if (err == -ESRCH) | |
1063 | pol = NULL; | |
1064 | else | |
1065 | pol = ERR_PTR(err); | |
1066 | } else | |
1da177e4 LT |
1067 | pol = NULL; |
1068 | } | |
1069 | read_unlock_bh(&xfrm_policy_lock); | |
1070 | return pol; | |
1071 | } | |
1072 | ||
1073 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1074 | { | |
98806f75 | 1075 | struct net *net = xp_net(pol); |
1121994c | 1076 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
2518c7c2 | 1077 | pol->family, dir); |
4e81bb83 | 1078 | |
98806f75 | 1079 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
2518c7c2 | 1080 | hlist_add_head(&pol->bydst, chain); |
e92303f8 | 1081 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
98806f75 | 1082 | net->xfrm.policy_count[dir]++; |
1da177e4 | 1083 | xfrm_pol_hold(pol); |
2518c7c2 | 1084 | |
98806f75 AD |
1085 | if (xfrm_bydst_should_resize(net, dir, NULL)) |
1086 | schedule_work(&net->xfrm.policy_hash_work); | |
1da177e4 LT |
1087 | } |
1088 | ||
1089 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1090 | int dir) | |
1091 | { | |
98806f75 AD |
1092 | struct net *net = xp_net(pol); |
1093 | ||
2518c7c2 DM |
1094 | if (hlist_unhashed(&pol->bydst)) |
1095 | return NULL; | |
1da177e4 | 1096 | |
2518c7c2 DM |
1097 | hlist_del(&pol->bydst); |
1098 | hlist_del(&pol->byidx); | |
12a169e7 | 1099 | list_del(&pol->walk.all); |
98806f75 | 1100 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1101 | |
1102 | return pol; | |
1da177e4 LT |
1103 | } |
1104 | ||
4666faab | 1105 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1106 | { |
1107 | write_lock_bh(&xfrm_policy_lock); | |
1108 | pol = __xfrm_policy_unlink(pol, dir); | |
1109 | write_unlock_bh(&xfrm_policy_lock); | |
1110 | if (pol) { | |
1111 | if (dir < XFRM_POLICY_MAX) | |
1112 | atomic_inc(&flow_cache_genid); | |
1113 | xfrm_policy_kill(pol); | |
4666faab | 1114 | return 0; |
1da177e4 | 1115 | } |
4666faab | 1116 | return -ENOENT; |
1da177e4 | 1117 | } |
a70fcb0b | 1118 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1119 | |
1120 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1121 | { | |
1121994c | 1122 | struct net *net = xp_net(pol); |
1da177e4 LT |
1123 | struct xfrm_policy *old_pol; |
1124 | ||
4e81bb83 MN |
1125 | #ifdef CONFIG_XFRM_SUB_POLICY |
1126 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1127 | return -EINVAL; | |
1128 | #endif | |
1129 | ||
1da177e4 LT |
1130 | write_lock_bh(&xfrm_policy_lock); |
1131 | old_pol = sk->sk_policy[dir]; | |
1132 | sk->sk_policy[dir] = pol; | |
1133 | if (pol) { | |
9d729f72 | 1134 | pol->curlft.add_time = get_seconds(); |
1121994c | 1135 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1136 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1137 | } | |
1138 | if (old_pol) | |
1139 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1140 | write_unlock_bh(&xfrm_policy_lock); | |
1141 | ||
1142 | if (old_pol) { | |
1143 | xfrm_policy_kill(old_pol); | |
1144 | } | |
1145 | return 0; | |
1146 | } | |
1147 | ||
1148 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1149 | { | |
0331b1f3 | 1150 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
1da177e4 LT |
1151 | |
1152 | if (newp) { | |
1153 | newp->selector = old->selector; | |
03e1ad7b PM |
1154 | if (security_xfrm_policy_clone(old->security, |
1155 | &newp->security)) { | |
df71837d TJ |
1156 | kfree(newp); |
1157 | return NULL; /* ENOMEM */ | |
1158 | } | |
1da177e4 LT |
1159 | newp->lft = old->lft; |
1160 | newp->curlft = old->curlft; | |
1161 | newp->action = old->action; | |
1162 | newp->flags = old->flags; | |
1163 | newp->xfrm_nr = old->xfrm_nr; | |
1164 | newp->index = old->index; | |
4e81bb83 | 1165 | newp->type = old->type; |
1da177e4 LT |
1166 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1167 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1168 | write_lock_bh(&xfrm_policy_lock); | |
1169 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1170 | write_unlock_bh(&xfrm_policy_lock); | |
1171 | xfrm_pol_put(newp); | |
1172 | } | |
1173 | return newp; | |
1174 | } | |
1175 | ||
1176 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1177 | { | |
1178 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1179 | *p1 = sk->sk_policy[1]; | |
1180 | ||
1181 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1182 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1183 | return -ENOMEM; | |
1184 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1185 | return -ENOMEM; | |
1186 | return 0; | |
1187 | } | |
1188 | ||
a1e59abf PM |
1189 | static int |
1190 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1191 | unsigned short family) | |
1192 | { | |
1193 | int err; | |
1194 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1195 | ||
1196 | if (unlikely(afinfo == NULL)) | |
1197 | return -EINVAL; | |
1198 | err = afinfo->get_saddr(local, remote); | |
1199 | xfrm_policy_put_afinfo(afinfo); | |
1200 | return err; | |
1201 | } | |
1202 | ||
1da177e4 LT |
1203 | /* Resolve list of templates for the flow, given policy. */ |
1204 | ||
1205 | static int | |
4e81bb83 MN |
1206 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1207 | struct xfrm_state **xfrm, | |
1208 | unsigned short family) | |
1da177e4 LT |
1209 | { |
1210 | int nx; | |
1211 | int i, error; | |
1212 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1213 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1214 | xfrm_address_t tmp; |
1da177e4 LT |
1215 | |
1216 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1217 | struct xfrm_state *x; | |
1218 | xfrm_address_t *remote = daddr; | |
1219 | xfrm_address_t *local = saddr; | |
1220 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1221 | ||
48b8d783 JK |
1222 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1223 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1224 | remote = &tmpl->id.daddr; |
1225 | local = &tmpl->saddr; | |
76b3f055 | 1226 | family = tmpl->encap_family; |
a1e59abf PM |
1227 | if (xfrm_addr_any(local, family)) { |
1228 | error = xfrm_get_saddr(&tmp, remote, family); | |
1229 | if (error) | |
1230 | goto fail; | |
1231 | local = &tmp; | |
1232 | } | |
1da177e4 LT |
1233 | } |
1234 | ||
1235 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1236 | ||
1237 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1238 | xfrm[nx++] = x; | |
1239 | daddr = remote; | |
1240 | saddr = local; | |
1241 | continue; | |
1242 | } | |
1243 | if (x) { | |
1244 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1245 | -EINVAL : -EAGAIN); | |
1246 | xfrm_state_put(x); | |
1247 | } | |
a4322266 | 1248 | else if (error == -ESRCH) |
1249 | error = -EAGAIN; | |
1da177e4 LT |
1250 | |
1251 | if (!tmpl->optional) | |
1252 | goto fail; | |
1253 | } | |
1254 | return nx; | |
1255 | ||
1256 | fail: | |
1257 | for (nx--; nx>=0; nx--) | |
1258 | xfrm_state_put(xfrm[nx]); | |
1259 | return error; | |
1260 | } | |
1261 | ||
4e81bb83 MN |
1262 | static int |
1263 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1264 | struct xfrm_state **xfrm, | |
1265 | unsigned short family) | |
1266 | { | |
41a49cc3 MN |
1267 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1268 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1269 | int cnx = 0; |
1270 | int error; | |
1271 | int ret; | |
1272 | int i; | |
1273 | ||
1274 | for (i = 0; i < npols; i++) { | |
1275 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1276 | error = -ENOBUFS; | |
1277 | goto fail; | |
1278 | } | |
41a49cc3 MN |
1279 | |
1280 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1281 | if (ret < 0) { |
1282 | error = ret; | |
1283 | goto fail; | |
1284 | } else | |
1285 | cnx += ret; | |
1286 | } | |
1287 | ||
41a49cc3 MN |
1288 | /* found states are sorted for outbound processing */ |
1289 | if (npols > 1) | |
1290 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1291 | ||
4e81bb83 MN |
1292 | return cnx; |
1293 | ||
1294 | fail: | |
1295 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1296 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1297 | return error; |
1298 | ||
1299 | } | |
1300 | ||
1da177e4 LT |
1301 | /* Check that the bundle accepts the flow and its components are |
1302 | * still valid. | |
1303 | */ | |
1304 | ||
1305 | static struct dst_entry * | |
1306 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1307 | { | |
1308 | struct dst_entry *x; | |
1309 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1310 | if (unlikely(afinfo == NULL)) | |
1311 | return ERR_PTR(-EINVAL); | |
1312 | x = afinfo->find_bundle(fl, policy); | |
1313 | xfrm_policy_put_afinfo(afinfo); | |
1314 | return x; | |
1315 | } | |
1316 | ||
25ee3286 HX |
1317 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
1318 | { | |
1319 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1320 | int tos; | |
1da177e4 | 1321 | |
25ee3286 HX |
1322 | if (!afinfo) |
1323 | return -EINVAL; | |
1324 | ||
1325 | tos = afinfo->get_tos(fl); | |
1326 | ||
1327 | xfrm_policy_put_afinfo(afinfo); | |
1328 | ||
1329 | return tos; | |
1330 | } | |
1331 | ||
1332 | static inline struct xfrm_dst *xfrm_alloc_dst(int family) | |
1da177e4 | 1333 | { |
1da177e4 | 1334 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
25ee3286 HX |
1335 | struct xfrm_dst *xdst; |
1336 | ||
1337 | if (!afinfo) | |
1338 | return ERR_PTR(-EINVAL); | |
1339 | ||
1340 | xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS); | |
1341 | ||
1342 | xfrm_policy_put_afinfo(afinfo); | |
1343 | ||
1344 | return xdst; | |
1345 | } | |
1346 | ||
a1b05140 MN |
1347 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1348 | int nfheader_len) | |
1349 | { | |
1350 | struct xfrm_policy_afinfo *afinfo = | |
1351 | xfrm_policy_get_afinfo(dst->ops->family); | |
1352 | int err; | |
1353 | ||
1354 | if (!afinfo) | |
1355 | return -EINVAL; | |
1356 | ||
1357 | err = afinfo->init_path(path, dst, nfheader_len); | |
1358 | ||
1359 | xfrm_policy_put_afinfo(afinfo); | |
1360 | ||
1361 | return err; | |
1362 | } | |
1363 | ||
25ee3286 HX |
1364 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) |
1365 | { | |
1366 | struct xfrm_policy_afinfo *afinfo = | |
1367 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1368 | int err; | |
1369 | ||
1370 | if (!afinfo) | |
1da177e4 | 1371 | return -EINVAL; |
25ee3286 HX |
1372 | |
1373 | err = afinfo->fill_dst(xdst, dev); | |
1374 | ||
1da177e4 | 1375 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1376 | |
1da177e4 LT |
1377 | return err; |
1378 | } | |
1379 | ||
25ee3286 HX |
1380 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1381 | * all the metrics... Shortly, bundle a bundle. | |
1382 | */ | |
1383 | ||
1384 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1385 | struct xfrm_state **xfrm, int nx, | |
1386 | struct flowi *fl, | |
1387 | struct dst_entry *dst) | |
1388 | { | |
1389 | unsigned long now = jiffies; | |
1390 | struct net_device *dev; | |
1391 | struct dst_entry *dst_prev = NULL; | |
1392 | struct dst_entry *dst0 = NULL; | |
1393 | int i = 0; | |
1394 | int err; | |
1395 | int header_len = 0; | |
a1b05140 | 1396 | int nfheader_len = 0; |
25ee3286 HX |
1397 | int trailer_len = 0; |
1398 | int tos; | |
1399 | int family = policy->selector.family; | |
9bb182a7 YH |
1400 | xfrm_address_t saddr, daddr; |
1401 | ||
1402 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1403 | |
1404 | tos = xfrm_get_tos(fl, family); | |
1405 | err = tos; | |
1406 | if (tos < 0) | |
1407 | goto put_states; | |
1408 | ||
1409 | dst_hold(dst); | |
1410 | ||
1411 | for (; i < nx; i++) { | |
1412 | struct xfrm_dst *xdst = xfrm_alloc_dst(family); | |
1413 | struct dst_entry *dst1 = &xdst->u.dst; | |
1414 | ||
1415 | err = PTR_ERR(xdst); | |
1416 | if (IS_ERR(xdst)) { | |
1417 | dst_release(dst); | |
1418 | goto put_states; | |
1419 | } | |
1420 | ||
1421 | if (!dst_prev) | |
1422 | dst0 = dst1; | |
1423 | else { | |
1424 | dst_prev->child = dst_clone(dst1); | |
1425 | dst1->flags |= DST_NOHASH; | |
1426 | } | |
1427 | ||
1428 | xdst->route = dst; | |
1429 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); | |
1430 | ||
1431 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1432 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1433 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1434 | family); | |
25ee3286 HX |
1435 | err = PTR_ERR(dst); |
1436 | if (IS_ERR(dst)) | |
1437 | goto put_states; | |
1438 | } else | |
1439 | dst_hold(dst); | |
1440 | ||
1441 | dst1->xfrm = xfrm[i]; | |
1442 | xdst->genid = xfrm[i]->genid; | |
1443 | ||
1444 | dst1->obsolete = -1; | |
1445 | dst1->flags |= DST_HOST; | |
1446 | dst1->lastuse = now; | |
1447 | ||
1448 | dst1->input = dst_discard; | |
1449 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1450 | ||
1451 | dst1->next = dst_prev; | |
1452 | dst_prev = dst1; | |
1453 | ||
1454 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1455 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1456 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1457 | trailer_len += xfrm[i]->props.trailer_len; |
1458 | } | |
1459 | ||
1460 | dst_prev->child = dst; | |
1461 | dst0->path = dst; | |
1462 | ||
1463 | err = -ENODEV; | |
1464 | dev = dst->dev; | |
1465 | if (!dev) | |
1466 | goto free_dst; | |
1467 | ||
1468 | /* Copy neighbout for reachability confirmation */ | |
1469 | dst0->neighbour = neigh_clone(dst->neighbour); | |
1470 | ||
a1b05140 | 1471 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1472 | xfrm_init_pmtu(dst_prev); |
1473 | ||
1474 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1475 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1476 | ||
1477 | err = xfrm_fill_dst(xdst, dev); | |
1478 | if (err) | |
1479 | goto free_dst; | |
1480 | ||
1481 | dst_prev->header_len = header_len; | |
1482 | dst_prev->trailer_len = trailer_len; | |
1483 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1484 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1485 | } | |
1486 | ||
1487 | out: | |
1488 | return dst0; | |
1489 | ||
1490 | put_states: | |
1491 | for (; i < nx; i++) | |
1492 | xfrm_state_put(xfrm[i]); | |
1493 | free_dst: | |
1494 | if (dst0) | |
1495 | dst_free(dst0); | |
1496 | dst0 = ERR_PTR(err); | |
1497 | goto out; | |
1498 | } | |
1499 | ||
157bfc25 MN |
1500 | static int inline |
1501 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1502 | { | |
1503 | if (!*target) { | |
1504 | *target = kmalloc(size, GFP_ATOMIC); | |
1505 | if (!*target) | |
1506 | return -ENOMEM; | |
1507 | } | |
1508 | memcpy(*target, src, size); | |
1509 | return 0; | |
1510 | } | |
1511 | ||
1512 | static int inline | |
1513 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1514 | { | |
1515 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1516 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1517 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1518 | sel, sizeof(*sel)); | |
1519 | #else | |
1520 | return 0; | |
1521 | #endif | |
1522 | } | |
1523 | ||
1524 | static int inline | |
1525 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1526 | { | |
1527 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1528 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1529 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1530 | #else | |
1531 | return 0; | |
1532 | #endif | |
1533 | } | |
1da177e4 LT |
1534 | |
1535 | static int stale_bundle(struct dst_entry *dst); | |
1536 | ||
1537 | /* Main function: finds/creates a bundle for given flow. | |
1538 | * | |
1539 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1540 | * on interfaces with disabled IPsec. | |
1541 | */ | |
52479b62 | 1542 | int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
14e50e57 | 1543 | struct sock *sk, int flags) |
1da177e4 LT |
1544 | { |
1545 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1546 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1547 | int npols; | |
1548 | int pol_dead; | |
1549 | int xfrm_nr; | |
1550 | int pi; | |
1da177e4 LT |
1551 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1552 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1553 | int nx = 0; | |
1554 | int err; | |
1555 | u32 genid; | |
42cf93cd | 1556 | u16 family; |
df71837d | 1557 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1558 | |
1da177e4 LT |
1559 | restart: |
1560 | genid = atomic_read(&flow_cache_genid); | |
1561 | policy = NULL; | |
4e81bb83 MN |
1562 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1563 | pols[pi] = NULL; | |
1564 | npols = 0; | |
1565 | pol_dead = 0; | |
1566 | xfrm_nr = 0; | |
1567 | ||
f7944fb1 | 1568 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
e0d1caa7 | 1569 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
75b8c133 | 1570 | err = PTR_ERR(policy); |
0aa64774 MN |
1571 | if (IS_ERR(policy)) { |
1572 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); | |
75b8c133 | 1573 | goto dropdst; |
0aa64774 | 1574 | } |
3bccfbc7 | 1575 | } |
1da177e4 LT |
1576 | |
1577 | if (!policy) { | |
1578 | /* To accelerate a bit... */ | |
2518c7c2 | 1579 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 1580 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 1581 | goto nopol; |
1da177e4 | 1582 | |
52479b62 | 1583 | policy = flow_cache_lookup(net, fl, dst_orig->ops->family, |
42cf93cd | 1584 | dir, xfrm_policy_lookup); |
75b8c133 | 1585 | err = PTR_ERR(policy); |
d66e37a9 MN |
1586 | if (IS_ERR(policy)) { |
1587 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); | |
75b8c133 | 1588 | goto dropdst; |
d66e37a9 | 1589 | } |
1da177e4 LT |
1590 | } |
1591 | ||
1592 | if (!policy) | |
8b7817f3 | 1593 | goto nopol; |
1da177e4 | 1594 | |
42cf93cd | 1595 | family = dst_orig->ops->family; |
4e81bb83 MN |
1596 | pols[0] = policy; |
1597 | npols ++; | |
1598 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 | 1599 | |
aef21785 | 1600 | err = -ENOENT; |
8b7817f3 HX |
1601 | if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP)) |
1602 | goto error; | |
1603 | ||
1604 | policy->curlft.use_time = get_seconds(); | |
1605 | ||
1da177e4 | 1606 | switch (policy->action) { |
5e5234ff | 1607 | default: |
1da177e4 LT |
1608 | case XFRM_POLICY_BLOCK: |
1609 | /* Prohibit the flow */ | |
0aa64774 | 1610 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1611 | err = -EPERM; |
1612 | goto error; | |
1da177e4 LT |
1613 | |
1614 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1615 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1616 | if (policy->xfrm_nr == 0) { |
1617 | /* Flow passes not transformed. */ | |
1618 | xfrm_pol_put(policy); | |
1619 | return 0; | |
1620 | } | |
4e81bb83 | 1621 | #endif |
1da177e4 LT |
1622 | |
1623 | /* Try to find matching bundle. | |
1624 | * | |
1625 | * LATER: help from flow cache. It is optional, this | |
1626 | * is required only for output policy. | |
1627 | */ | |
1628 | dst = xfrm_find_bundle(fl, policy, family); | |
1629 | if (IS_ERR(dst)) { | |
0aa64774 | 1630 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
e104411b PM |
1631 | err = PTR_ERR(dst); |
1632 | goto error; | |
1da177e4 LT |
1633 | } |
1634 | ||
1635 | if (dst) | |
1636 | break; | |
1637 | ||
4e81bb83 MN |
1638 | #ifdef CONFIG_XFRM_SUB_POLICY |
1639 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
52479b62 AD |
1640 | pols[1] = xfrm_policy_lookup_bytype(net, |
1641 | XFRM_POLICY_TYPE_MAIN, | |
4e81bb83 MN |
1642 | fl, family, |
1643 | XFRM_POLICY_OUT); | |
1644 | if (pols[1]) { | |
134b0fc5 | 1645 | if (IS_ERR(pols[1])) { |
0aa64774 | 1646 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); |
134b0fc5 JM |
1647 | err = PTR_ERR(pols[1]); |
1648 | goto error; | |
1649 | } | |
4e81bb83 | 1650 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
0aa64774 | 1651 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
4e81bb83 MN |
1652 | err = -EPERM; |
1653 | goto error; | |
1654 | } | |
1655 | npols ++; | |
1656 | xfrm_nr += pols[1]->xfrm_nr; | |
1657 | } | |
1658 | } | |
1659 | ||
1660 | /* | |
1661 | * Because neither flowi nor bundle information knows about | |
1662 | * transformation template size. On more than one policy usage | |
1663 | * we can realize whether all of them is bypass or not after | |
1664 | * they are searched. See above not-transformed bypass | |
1665 | * is surrounded by non-sub policy configuration, too. | |
1666 | */ | |
1667 | if (xfrm_nr == 0) { | |
1668 | /* Flow passes not transformed. */ | |
1669 | xfrm_pols_put(pols, npols); | |
1670 | return 0; | |
1671 | } | |
1672 | ||
1673 | #endif | |
1674 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1675 | |
1676 | if (unlikely(nx<0)) { | |
1677 | err = nx; | |
14e50e57 DM |
1678 | if (err == -EAGAIN && sysctl_xfrm_larval_drop) { |
1679 | /* EREMOTE tells the caller to generate | |
1680 | * a one-shot blackhole route. | |
1681 | */ | |
d66e37a9 | 1682 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
14e50e57 DM |
1683 | xfrm_pol_put(policy); |
1684 | return -EREMOTE; | |
1685 | } | |
815f4e57 | 1686 | if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) { |
1da177e4 LT |
1687 | DECLARE_WAITQUEUE(wait, current); |
1688 | ||
52479b62 | 1689 | add_wait_queue(&net->xfrm.km_waitq, &wait); |
1da177e4 LT |
1690 | set_current_state(TASK_INTERRUPTIBLE); |
1691 | schedule(); | |
1692 | set_current_state(TASK_RUNNING); | |
52479b62 | 1693 | remove_wait_queue(&net->xfrm.km_waitq, &wait); |
1da177e4 | 1694 | |
4e81bb83 | 1695 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1696 | |
1697 | if (nx == -EAGAIN && signal_pending(current)) { | |
0aa64774 | 1698 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 LT |
1699 | err = -ERESTART; |
1700 | goto error; | |
1701 | } | |
1702 | if (nx == -EAGAIN || | |
1703 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1704 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1705 | goto restart; |
1706 | } | |
1707 | err = nx; | |
1708 | } | |
0aa64774 MN |
1709 | if (err < 0) { |
1710 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); | |
1da177e4 | 1711 | goto error; |
0aa64774 | 1712 | } |
1da177e4 LT |
1713 | } |
1714 | if (nx == 0) { | |
1715 | /* Flow passes not transformed. */ | |
4e81bb83 | 1716 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1717 | return 0; |
1718 | } | |
1719 | ||
25ee3286 HX |
1720 | dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); |
1721 | err = PTR_ERR(dst); | |
0aa64774 MN |
1722 | if (IS_ERR(dst)) { |
1723 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1da177e4 | 1724 | goto error; |
0aa64774 | 1725 | } |
1da177e4 | 1726 | |
4e81bb83 MN |
1727 | for (pi = 0; pi < npols; pi++) { |
1728 | read_lock_bh(&pols[pi]->lock); | |
12a169e7 | 1729 | pol_dead |= pols[pi]->walk.dead; |
4e81bb83 MN |
1730 | read_unlock_bh(&pols[pi]->lock); |
1731 | } | |
1732 | ||
1da177e4 | 1733 | write_lock_bh(&policy->lock); |
4e81bb83 | 1734 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1735 | /* Wow! While we worked on resolving, this |
1736 | * policy has gone. Retry. It is not paranoia, | |
1737 | * we just cannot enlist new bundle to dead object. | |
1738 | * We can't enlist stable bundles either. | |
1739 | */ | |
1740 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1741 | dst_free(dst); |
00de651d | 1742 | |
0aa64774 MN |
1743 | if (pol_dead) |
1744 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD); | |
1745 | else | |
1746 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
00de651d HX |
1747 | err = -EHOSTUNREACH; |
1748 | goto error; | |
1da177e4 | 1749 | } |
157bfc25 MN |
1750 | |
1751 | if (npols > 1) | |
1752 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1753 | else | |
1754 | err = xfrm_dst_update_origin(dst, fl); | |
1755 | if (unlikely(err)) { | |
1756 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1757 | dst_free(dst); |
0aa64774 | 1758 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
157bfc25 MN |
1759 | goto error; |
1760 | } | |
1761 | ||
1da177e4 LT |
1762 | dst->next = policy->bundles; |
1763 | policy->bundles = dst; | |
1764 | dst_hold(dst); | |
1765 | write_unlock_bh(&policy->lock); | |
1766 | } | |
1767 | *dst_p = dst; | |
1768 | dst_release(dst_orig); | |
a716c119 | 1769 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1770 | return 0; |
1771 | ||
1772 | error: | |
4e81bb83 | 1773 | xfrm_pols_put(pols, npols); |
75b8c133 HX |
1774 | dropdst: |
1775 | dst_release(dst_orig); | |
1da177e4 LT |
1776 | *dst_p = NULL; |
1777 | return err; | |
8b7817f3 HX |
1778 | |
1779 | nopol: | |
aef21785 | 1780 | err = -ENOENT; |
8b7817f3 HX |
1781 | if (flags & XFRM_LOOKUP_ICMP) |
1782 | goto dropdst; | |
1783 | return 0; | |
1da177e4 | 1784 | } |
14e50e57 DM |
1785 | EXPORT_SYMBOL(__xfrm_lookup); |
1786 | ||
52479b62 | 1787 | int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
14e50e57 DM |
1788 | struct sock *sk, int flags) |
1789 | { | |
52479b62 | 1790 | int err = __xfrm_lookup(net, dst_p, fl, sk, flags); |
14e50e57 DM |
1791 | |
1792 | if (err == -EREMOTE) { | |
1793 | dst_release(*dst_p); | |
1794 | *dst_p = NULL; | |
1795 | err = -EAGAIN; | |
1796 | } | |
1797 | ||
1798 | return err; | |
1799 | } | |
1da177e4 LT |
1800 | EXPORT_SYMBOL(xfrm_lookup); |
1801 | ||
df0ba92a MN |
1802 | static inline int |
1803 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1804 | { | |
1805 | struct xfrm_state *x; | |
df0ba92a MN |
1806 | |
1807 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1808 | return 0; | |
1809 | x = skb->sp->xvec[idx]; | |
1810 | if (!x->type->reject) | |
1811 | return 0; | |
1ecafede | 1812 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1813 | } |
1814 | ||
1da177e4 LT |
1815 | /* When skb is transformed back to its "native" form, we have to |
1816 | * check policy restrictions. At the moment we make this in maximally | |
1817 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1818 | * have policy cached at them. | |
1819 | */ | |
1820 | ||
1821 | static inline int | |
a716c119 | 1822 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1823 | unsigned short family) |
1824 | { | |
1825 | if (xfrm_state_kern(x)) | |
928ba416 | 1826 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1827 | return x->id.proto == tmpl->id.proto && |
1828 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1829 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1830 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1831 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1832 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1833 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1834 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1835 | } |
1836 | ||
df0ba92a MN |
1837 | /* |
1838 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1839 | * because of optional transport mode, or next index of the mathced secpath | |
1840 | * state with the template. | |
1841 | * -1 is returned when no matching template is found. | |
1842 | * Otherwise "-2 - errored_index" is returned. | |
1843 | */ | |
1da177e4 LT |
1844 | static inline int |
1845 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1846 | unsigned short family) | |
1847 | { | |
1848 | int idx = start; | |
1849 | ||
1850 | if (tmpl->optional) { | |
7e49e6de | 1851 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1852 | return start; |
1853 | } else | |
1854 | start = -1; | |
1855 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1856 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1857 | return ++idx; |
df0ba92a MN |
1858 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1859 | if (start == -1) | |
1860 | start = -2-idx; | |
1da177e4 | 1861 | break; |
df0ba92a | 1862 | } |
1da177e4 LT |
1863 | } |
1864 | return start; | |
1865 | } | |
1866 | ||
d5422efe HX |
1867 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1868 | unsigned int family, int reverse) | |
1da177e4 LT |
1869 | { |
1870 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1871 | int err; |
1da177e4 LT |
1872 | |
1873 | if (unlikely(afinfo == NULL)) | |
1874 | return -EAFNOSUPPORT; | |
1875 | ||
d5422efe | 1876 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1877 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1878 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1879 | return err; |
1da177e4 | 1880 | } |
d5422efe | 1881 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1882 | |
df0ba92a | 1883 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1884 | { |
1885 | for (; k < sp->len; k++) { | |
df0ba92a | 1886 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1887 | *idxp = k; |
1da177e4 | 1888 | return 1; |
df0ba92a | 1889 | } |
1da177e4 LT |
1890 | } |
1891 | ||
1892 | return 0; | |
1893 | } | |
1894 | ||
a716c119 | 1895 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1896 | unsigned short family) |
1897 | { | |
f6e1e25d | 1898 | struct net *net = dev_net(skb->dev); |
1da177e4 | 1899 | struct xfrm_policy *pol; |
4e81bb83 MN |
1900 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1901 | int npols = 0; | |
1902 | int xfrm_nr; | |
1903 | int pi; | |
d5422efe | 1904 | int reverse; |
1da177e4 | 1905 | struct flowi fl; |
d5422efe | 1906 | u8 fl_dir; |
df0ba92a | 1907 | int xerr_idx = -1; |
1da177e4 | 1908 | |
d5422efe HX |
1909 | reverse = dir & ~XFRM_POLICY_MASK; |
1910 | dir &= XFRM_POLICY_MASK; | |
1911 | fl_dir = policy_to_flow_dir(dir); | |
1912 | ||
0aa64774 MN |
1913 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
1914 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 1915 | return 0; |
0aa64774 MN |
1916 | } |
1917 | ||
eb9c7ebe | 1918 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1919 | |
1920 | /* First, check used SA against their selectors. */ | |
1921 | if (skb->sp) { | |
1922 | int i; | |
1923 | ||
1924 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 1925 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 MN |
1926 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
1927 | XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH); | |
1da177e4 | 1928 | return 0; |
0aa64774 | 1929 | } |
1da177e4 LT |
1930 | } |
1931 | } | |
1932 | ||
1933 | pol = NULL; | |
3bccfbc7 | 1934 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1935 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 MN |
1936 | if (IS_ERR(pol)) { |
1937 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
3bccfbc7 | 1938 | return 0; |
0aa64774 | 1939 | } |
3bccfbc7 | 1940 | } |
1da177e4 LT |
1941 | |
1942 | if (!pol) | |
f6e1e25d | 1943 | pol = flow_cache_lookup(net, &fl, family, fl_dir, |
1da177e4 LT |
1944 | xfrm_policy_lookup); |
1945 | ||
0aa64774 MN |
1946 | if (IS_ERR(pol)) { |
1947 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1948 | return 0; |
0aa64774 | 1949 | } |
134b0fc5 | 1950 | |
df0ba92a | 1951 | if (!pol) { |
d1d9facf | 1952 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 1953 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
0aa64774 | 1954 | XFRM_INC_STATS(LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
1955 | return 0; |
1956 | } | |
1957 | return 1; | |
1958 | } | |
1da177e4 | 1959 | |
9d729f72 | 1960 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1961 | |
4e81bb83 MN |
1962 | pols[0] = pol; |
1963 | npols ++; | |
1964 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1965 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 1966 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
1967 | &fl, family, |
1968 | XFRM_POLICY_IN); | |
1969 | if (pols[1]) { | |
0aa64774 MN |
1970 | if (IS_ERR(pols[1])) { |
1971 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1972 | return 0; |
0aa64774 | 1973 | } |
9d729f72 | 1974 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1975 | npols ++; |
1976 | } | |
1977 | } | |
1978 | #endif | |
1979 | ||
1da177e4 LT |
1980 | if (pol->action == XFRM_POLICY_ALLOW) { |
1981 | struct sec_path *sp; | |
1982 | static struct sec_path dummy; | |
4e81bb83 | 1983 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1984 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1985 | struct xfrm_tmpl **tpp = tp; |
1986 | int ti = 0; | |
1da177e4 LT |
1987 | int i, k; |
1988 | ||
1989 | if ((sp = skb->sp) == NULL) | |
1990 | sp = &dummy; | |
1991 | ||
4e81bb83 MN |
1992 | for (pi = 0; pi < npols; pi++) { |
1993 | if (pols[pi] != pol && | |
0aa64774 MN |
1994 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
1995 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); | |
4e81bb83 | 1996 | goto reject; |
0aa64774 MN |
1997 | } |
1998 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1999 | XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR); | |
4e81bb83 | 2000 | goto reject_error; |
0aa64774 | 2001 | } |
4e81bb83 MN |
2002 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2003 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2004 | } | |
2005 | xfrm_nr = ti; | |
41a49cc3 MN |
2006 | if (npols > 1) { |
2007 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2008 | tpp = stp; | |
2009 | } | |
4e81bb83 | 2010 | |
1da177e4 LT |
2011 | /* For each tunnel xfrm, find the first matching tmpl. |
2012 | * For each tmpl before that, find corresponding xfrm. | |
2013 | * Order is _important_. Later we will implement | |
2014 | * some barriers, but at the moment barriers | |
2015 | * are implied between each two transformations. | |
2016 | */ | |
4e81bb83 MN |
2017 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2018 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2019 | if (k < 0) { |
d1d9facf JM |
2020 | if (k < -1) |
2021 | /* "-2 - errored_index" returned */ | |
2022 | xerr_idx = -(2+k); | |
0aa64774 | 2023 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2024 | goto reject; |
df0ba92a | 2025 | } |
1da177e4 LT |
2026 | } |
2027 | ||
0aa64774 MN |
2028 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
2029 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); | |
1da177e4 | 2030 | goto reject; |
0aa64774 | 2031 | } |
1da177e4 | 2032 | |
4e81bb83 | 2033 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2034 | return 1; |
2035 | } | |
0aa64774 | 2036 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2037 | |
2038 | reject: | |
df0ba92a | 2039 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2040 | reject_error: |
2041 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2042 | return 0; |
2043 | } | |
2044 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2045 | ||
2046 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2047 | { | |
99a66657 | 2048 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
2049 | struct flowi fl; |
2050 | ||
0aa64774 MN |
2051 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
2052 | /* XXX: we should have something like FWDHDRERROR here. */ | |
2053 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 2054 | return 0; |
0aa64774 | 2055 | } |
1da177e4 | 2056 | |
99a66657 | 2057 | return xfrm_lookup(net, &skb->dst, &fl, NULL, 0) == 0; |
1da177e4 LT |
2058 | } |
2059 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2060 | ||
d49c73c7 DM |
2061 | /* Optimize later using cookies and generation ids. */ |
2062 | ||
1da177e4 LT |
2063 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2064 | { | |
d49c73c7 DM |
2065 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
2066 | * to "-1" to force all XFRM destinations to get validated by | |
2067 | * dst_ops->check on every use. We do this because when a | |
2068 | * normal route referenced by an XFRM dst is obsoleted we do | |
2069 | * not go looking around for all parent referencing XFRM dsts | |
2070 | * so that we can invalidate them. It is just too much work. | |
2071 | * Instead we make the checks here on every use. For example: | |
2072 | * | |
2073 | * XFRM dst A --> IPv4 dst X | |
2074 | * | |
2075 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2076 | * in this example). If X is marked obsolete, "A" will not | |
2077 | * notice. That's what we are validating here via the | |
2078 | * stale_bundle() check. | |
2079 | * | |
2080 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2081 | * dst which causes it's ->obsolete field to be set to a | |
2082 | * positive non-zero integer. If an XFRM dst has been pruned | |
2083 | * like this, we want to force a new route lookup. | |
399c180a | 2084 | */ |
d49c73c7 DM |
2085 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2086 | return dst; | |
2087 | ||
1da177e4 LT |
2088 | return NULL; |
2089 | } | |
2090 | ||
2091 | static int stale_bundle(struct dst_entry *dst) | |
2092 | { | |
5b368e61 | 2093 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
2094 | } |
2095 | ||
aabc9761 | 2096 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2097 | { |
1da177e4 | 2098 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2099 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2100 | dev_hold(dst->dev); |
1da177e4 LT |
2101 | dev_put(dev); |
2102 | } | |
2103 | } | |
aabc9761 | 2104 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2105 | |
2106 | static void xfrm_link_failure(struct sk_buff *skb) | |
2107 | { | |
2108 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
2109 | return; | |
2110 | } | |
2111 | ||
2112 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2113 | { | |
2114 | if (dst) { | |
2115 | if (dst->obsolete) { | |
2116 | dst_release(dst); | |
2117 | dst = NULL; | |
2118 | } | |
2119 | } | |
2120 | return dst; | |
2121 | } | |
2122 | ||
2518c7c2 DM |
2123 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
2124 | { | |
2125 | struct dst_entry *dst, **dstp; | |
2126 | ||
2127 | write_lock(&pol->lock); | |
2128 | dstp = &pol->bundles; | |
2129 | while ((dst=*dstp) != NULL) { | |
2130 | if (func(dst)) { | |
2131 | *dstp = dst->next; | |
2132 | dst->next = *gc_list_p; | |
2133 | *gc_list_p = dst; | |
2134 | } else { | |
2135 | dstp = &dst->next; | |
2136 | } | |
2137 | } | |
2138 | write_unlock(&pol->lock); | |
2139 | } | |
2140 | ||
3dd0b499 | 2141 | static void xfrm_prune_bundles(struct net *net, int (*func)(struct dst_entry *)) |
1da177e4 | 2142 | { |
2518c7c2 DM |
2143 | struct dst_entry *gc_list = NULL; |
2144 | int dir; | |
1da177e4 LT |
2145 | |
2146 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
2147 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
2148 | struct xfrm_policy *pol; | |
2149 | struct hlist_node *entry; | |
2150 | struct hlist_head *table; | |
2151 | int i; | |
4e81bb83 | 2152 | |
2518c7c2 | 2153 | hlist_for_each_entry(pol, entry, |
3dd0b499 | 2154 | &net->xfrm.policy_inexact[dir], bydst) |
2518c7c2 DM |
2155 | prune_one_bundle(pol, func, &gc_list); |
2156 | ||
3dd0b499 AD |
2157 | table = net->xfrm.policy_bydst[dir].table; |
2158 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { | |
2518c7c2 DM |
2159 | hlist_for_each_entry(pol, entry, table + i, bydst) |
2160 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
2161 | } |
2162 | } | |
2163 | read_unlock_bh(&xfrm_policy_lock); | |
2164 | ||
2165 | while (gc_list) { | |
2518c7c2 | 2166 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2167 | gc_list = dst->next; |
2168 | dst_free(dst); | |
2169 | } | |
2170 | } | |
2171 | ||
2172 | static int unused_bundle(struct dst_entry *dst) | |
2173 | { | |
2174 | return !atomic_read(&dst->__refcnt); | |
2175 | } | |
2176 | ||
ddcfd796 | 2177 | static void __xfrm_garbage_collect(struct net *net) |
1da177e4 | 2178 | { |
ddcfd796 | 2179 | xfrm_prune_bundles(net, unused_bundle); |
1da177e4 LT |
2180 | } |
2181 | ||
3dd0b499 | 2182 | static int xfrm_flush_bundles(struct net *net) |
1da177e4 | 2183 | { |
3dd0b499 | 2184 | xfrm_prune_bundles(net, stale_bundle); |
1da177e4 LT |
2185 | return 0; |
2186 | } | |
2187 | ||
25ee3286 | 2188 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2189 | { |
2190 | do { | |
2191 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2192 | u32 pmtu, route_mtu_cached; | |
2193 | ||
2194 | pmtu = dst_mtu(dst->child); | |
2195 | xdst->child_mtu_cached = pmtu; | |
2196 | ||
2197 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2198 | ||
2199 | route_mtu_cached = dst_mtu(xdst->route); | |
2200 | xdst->route_mtu_cached = route_mtu_cached; | |
2201 | ||
2202 | if (pmtu > route_mtu_cached) | |
2203 | pmtu = route_mtu_cached; | |
2204 | ||
2205 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2206 | } while ((dst = dst->next)); | |
2207 | } | |
2208 | ||
1da177e4 LT |
2209 | /* Check that the bundle accepts the flow and its components are |
2210 | * still valid. | |
2211 | */ | |
2212 | ||
5b368e61 VY |
2213 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2214 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2215 | { |
2216 | struct dst_entry *dst = &first->u.dst; | |
2217 | struct xfrm_dst *last; | |
2218 | u32 mtu; | |
2219 | ||
92d63dec | 2220 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2221 | (dst->dev && !netif_running(dst->dev))) |
2222 | return 0; | |
157bfc25 MN |
2223 | #ifdef CONFIG_XFRM_SUB_POLICY |
2224 | if (fl) { | |
2225 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2226 | return 0; | |
2227 | if (first->partner && | |
2228 | !xfrm_selector_match(first->partner, fl, family)) | |
2229 | return 0; | |
2230 | } | |
2231 | #endif | |
1da177e4 LT |
2232 | |
2233 | last = NULL; | |
2234 | ||
2235 | do { | |
2236 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2237 | ||
2238 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2239 | return 0; | |
67f83cbf VY |
2240 | if (fl && pol && |
2241 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2242 | return 0; |
1da177e4 LT |
2243 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2244 | return 0; | |
9d4a706d DM |
2245 | if (xdst->genid != dst->xfrm->genid) |
2246 | return 0; | |
e53820de | 2247 | |
1bfcb10f | 2248 | if (strict && fl && |
13996378 | 2249 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2250 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2251 | return 0; | |
1da177e4 LT |
2252 | |
2253 | mtu = dst_mtu(dst->child); | |
2254 | if (xdst->child_mtu_cached != mtu) { | |
2255 | last = xdst; | |
2256 | xdst->child_mtu_cached = mtu; | |
2257 | } | |
2258 | ||
92d63dec | 2259 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2260 | return 0; |
2261 | mtu = dst_mtu(xdst->route); | |
2262 | if (xdst->route_mtu_cached != mtu) { | |
2263 | last = xdst; | |
2264 | xdst->route_mtu_cached = mtu; | |
2265 | } | |
2266 | ||
2267 | dst = dst->child; | |
2268 | } while (dst->xfrm); | |
2269 | ||
2270 | if (likely(!last)) | |
2271 | return 1; | |
2272 | ||
2273 | mtu = last->child_mtu_cached; | |
2274 | for (;;) { | |
2275 | dst = &last->u.dst; | |
2276 | ||
2277 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2278 | if (mtu > last->route_mtu_cached) | |
2279 | mtu = last->route_mtu_cached; | |
2280 | dst->metrics[RTAX_MTU-1] = mtu; | |
2281 | ||
2282 | if (last == first) | |
2283 | break; | |
2284 | ||
bd0bf076 | 2285 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2286 | last->child_mtu_cached = mtu; |
2287 | } | |
2288 | ||
2289 | return 1; | |
2290 | } | |
2291 | ||
2292 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2293 | ||
1da177e4 LT |
2294 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2295 | { | |
2296 | int err = 0; | |
2297 | if (unlikely(afinfo == NULL)) | |
2298 | return -EINVAL; | |
2299 | if (unlikely(afinfo->family >= NPROTO)) | |
2300 | return -EAFNOSUPPORT; | |
e959d812 | 2301 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2302 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2303 | err = -ENOBUFS; | |
2304 | else { | |
2305 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2306 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2307 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2308 | if (likely(dst_ops->check == NULL)) | |
2309 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2310 | if (likely(dst_ops->negative_advice == NULL)) |
2311 | dst_ops->negative_advice = xfrm_negative_advice; | |
2312 | if (likely(dst_ops->link_failure == NULL)) | |
2313 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2314 | if (likely(afinfo->garbage_collect == NULL)) |
2315 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2316 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2317 | } | |
e959d812 | 2318 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2319 | return err; |
2320 | } | |
2321 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2322 | ||
2323 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2324 | { | |
2325 | int err = 0; | |
2326 | if (unlikely(afinfo == NULL)) | |
2327 | return -EINVAL; | |
2328 | if (unlikely(afinfo->family >= NPROTO)) | |
2329 | return -EAFNOSUPPORT; | |
e959d812 | 2330 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2331 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2332 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2333 | err = -EINVAL; | |
2334 | else { | |
2335 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2336 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2337 | dst_ops->kmem_cachep = NULL; | |
2338 | dst_ops->check = NULL; | |
1da177e4 LT |
2339 | dst_ops->negative_advice = NULL; |
2340 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2341 | afinfo->garbage_collect = NULL; |
2342 | } | |
2343 | } | |
e959d812 | 2344 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2345 | return err; |
2346 | } | |
2347 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2348 | ||
2349 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2350 | { | |
2351 | struct xfrm_policy_afinfo *afinfo; | |
2352 | if (unlikely(family >= NPROTO)) | |
2353 | return NULL; | |
2354 | read_lock(&xfrm_policy_afinfo_lock); | |
2355 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2356 | if (unlikely(!afinfo)) |
2357 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2358 | return afinfo; |
2359 | } | |
2360 | ||
2361 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2362 | { | |
546be240 HX |
2363 | read_unlock(&xfrm_policy_afinfo_lock); |
2364 | } | |
2365 | ||
1da177e4 LT |
2366 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2367 | { | |
e9dc8653 EB |
2368 | struct net_device *dev = ptr; |
2369 | ||
1da177e4 LT |
2370 | switch (event) { |
2371 | case NETDEV_DOWN: | |
3dd0b499 | 2372 | xfrm_flush_bundles(dev_net(dev)); |
1da177e4 LT |
2373 | } |
2374 | return NOTIFY_DONE; | |
2375 | } | |
2376 | ||
2377 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2378 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2379 | }; |
2380 | ||
558f82ef MN |
2381 | #ifdef CONFIG_XFRM_STATISTICS |
2382 | static int __init xfrm_statistics_init(void) | |
2383 | { | |
2384 | if (snmp_mib_init((void **)xfrm_statistics, | |
2385 | sizeof(struct linux_xfrm_mib)) < 0) | |
2386 | return -ENOMEM; | |
2387 | return 0; | |
2388 | } | |
2389 | #endif | |
2390 | ||
d62ddc21 | 2391 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2392 | { |
2518c7c2 DM |
2393 | unsigned int hmask, sz; |
2394 | int dir; | |
2395 | ||
d62ddc21 AD |
2396 | if (net_eq(net, &init_net)) |
2397 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2398 | sizeof(struct xfrm_dst), |
e5d679f3 | 2399 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2400 | NULL); |
1da177e4 | 2401 | |
2518c7c2 DM |
2402 | hmask = 8 - 1; |
2403 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2404 | ||
93b851c1 AD |
2405 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2406 | if (!net->xfrm.policy_byidx) | |
2407 | goto out_byidx; | |
8100bea7 | 2408 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 DM |
2409 | |
2410 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2411 | struct xfrm_policy_hash *htab; | |
2412 | ||
dc2caba7 | 2413 | net->xfrm.policy_count[dir] = 0; |
8b18f8ea | 2414 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2415 | |
a35f6c5d | 2416 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2417 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2418 | if (!htab->table) |
a35f6c5d AD |
2419 | goto out_bydst; |
2420 | htab->hmask = hmask; | |
2518c7c2 DM |
2421 | } |
2422 | ||
adfcf0b2 | 2423 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2424 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
d62ddc21 AD |
2425 | if (net_eq(net, &init_net)) |
2426 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2427 | return 0; | |
93b851c1 | 2428 | |
a35f6c5d AD |
2429 | out_bydst: |
2430 | for (dir--; dir >= 0; dir--) { | |
2431 | struct xfrm_policy_hash *htab; | |
2432 | ||
2433 | htab = &net->xfrm.policy_bydst[dir]; | |
2434 | xfrm_hash_free(htab->table, sz); | |
2435 | } | |
2436 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
2437 | out_byidx: |
2438 | return -ENOMEM; | |
d62ddc21 AD |
2439 | } |
2440 | ||
2441 | static void xfrm_policy_fini(struct net *net) | |
2442 | { | |
93b851c1 | 2443 | unsigned int sz; |
8b18f8ea | 2444 | int dir; |
93b851c1 | 2445 | |
adfcf0b2 | 2446 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2447 | |
8b18f8ea | 2448 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
a35f6c5d AD |
2449 | struct xfrm_policy_hash *htab; |
2450 | ||
8b18f8ea | 2451 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
2452 | |
2453 | htab = &net->xfrm.policy_bydst[dir]; | |
2454 | sz = (htab->hmask + 1); | |
2455 | WARN_ON(!hlist_empty(htab->table)); | |
2456 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
2457 | } |
2458 | ||
8100bea7 | 2459 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2460 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2461 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2462 | } |
2463 | ||
d62ddc21 AD |
2464 | static int __net_init xfrm_net_init(struct net *net) |
2465 | { | |
2466 | int rv; | |
2467 | ||
2468 | rv = xfrm_state_init(net); | |
2469 | if (rv < 0) | |
2470 | goto out_state; | |
2471 | rv = xfrm_policy_init(net); | |
2472 | if (rv < 0) | |
2473 | goto out_policy; | |
2474 | return 0; | |
2475 | ||
2476 | out_policy: | |
2477 | xfrm_state_fini(net); | |
2478 | out_state: | |
2479 | return rv; | |
2480 | } | |
2481 | ||
2482 | static void __net_exit xfrm_net_exit(struct net *net) | |
2483 | { | |
2484 | xfrm_policy_fini(net); | |
2485 | xfrm_state_fini(net); | |
2486 | } | |
2487 | ||
2488 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2489 | .init = xfrm_net_init, | |
2490 | .exit = xfrm_net_exit, | |
2491 | }; | |
2492 | ||
1da177e4 LT |
2493 | void __init xfrm_init(void) |
2494 | { | |
d62ddc21 | 2495 | register_pernet_subsys(&xfrm_net_ops); |
558f82ef MN |
2496 | #ifdef CONFIG_XFRM_STATISTICS |
2497 | xfrm_statistics_init(); | |
2498 | #endif | |
1da177e4 | 2499 | xfrm_input_init(); |
558f82ef MN |
2500 | #ifdef CONFIG_XFRM_STATISTICS |
2501 | xfrm_proc_init(); | |
2502 | #endif | |
1da177e4 LT |
2503 | } |
2504 | ||
ab5f5e8b | 2505 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2506 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2507 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2508 | { |
875179fa PM |
2509 | struct xfrm_sec_ctx *ctx = xp->security; |
2510 | struct xfrm_selector *sel = &xp->selector; | |
2511 | ||
2512 | if (ctx) | |
ab5f5e8b | 2513 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2514 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2515 | |
875179fa | 2516 | switch(sel->family) { |
ab5f5e8b | 2517 | case AF_INET: |
21454aaa | 2518 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2519 | if (sel->prefixlen_s != 32) |
2520 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2521 | sel->prefixlen_s); | |
21454aaa | 2522 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2523 | if (sel->prefixlen_d != 32) |
2524 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2525 | sel->prefixlen_d); | |
ab5f5e8b JL |
2526 | break; |
2527 | case AF_INET6: | |
5b095d98 | 2528 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2529 | if (sel->prefixlen_s != 128) |
2530 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2531 | sel->prefixlen_s); | |
5b095d98 | 2532 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2533 | if (sel->prefixlen_d != 128) |
2534 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2535 | sel->prefixlen_d); | |
ab5f5e8b JL |
2536 | break; |
2537 | } | |
2538 | } | |
2539 | ||
68277acc | 2540 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2532386f | 2541 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2542 | { |
2543 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2544 | |
afeb14b4 | 2545 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2546 | if (audit_buf == NULL) |
2547 | return; | |
2532386f | 2548 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2549 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2550 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2551 | audit_log_end(audit_buf); | |
2552 | } | |
2553 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2554 | ||
68277acc | 2555 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2532386f | 2556 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2557 | { |
2558 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2559 | |
afeb14b4 | 2560 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2561 | if (audit_buf == NULL) |
2562 | return; | |
2532386f | 2563 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2564 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2565 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2566 | audit_log_end(audit_buf); | |
2567 | } | |
2568 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2569 | #endif | |
2570 | ||
80c9abaa SS |
2571 | #ifdef CONFIG_XFRM_MIGRATE |
2572 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2573 | struct xfrm_selector *sel_tgt) | |
2574 | { | |
2575 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2576 | if (sel_tgt->family == sel_cmp->family && | |
2577 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2578 | sel_cmp->family) == 0 && |
80c9abaa SS |
2579 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2580 | sel_cmp->family) == 0 && | |
2581 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2582 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2583 | return 1; | |
2584 | } | |
2585 | } else { | |
2586 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2587 | return 1; | |
2588 | } | |
2589 | } | |
2590 | return 0; | |
2591 | } | |
2592 | ||
2593 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2594 | u8 dir, u8 type) | |
2595 | { | |
2596 | struct xfrm_policy *pol, *ret = NULL; | |
2597 | struct hlist_node *entry; | |
2598 | struct hlist_head *chain; | |
2599 | u32 priority = ~0U; | |
2600 | ||
2601 | read_lock_bh(&xfrm_policy_lock); | |
1121994c | 2602 | chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir); |
80c9abaa SS |
2603 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2604 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2605 | pol->type == type) { | |
2606 | ret = pol; | |
2607 | priority = ret->priority; | |
2608 | break; | |
2609 | } | |
2610 | } | |
8b18f8ea | 2611 | chain = &init_net.xfrm.policy_inexact[dir]; |
80c9abaa SS |
2612 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2613 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2614 | pol->type == type && | |
2615 | pol->priority < priority) { | |
2616 | ret = pol; | |
2617 | break; | |
2618 | } | |
2619 | } | |
2620 | ||
2621 | if (ret) | |
2622 | xfrm_pol_hold(ret); | |
2623 | ||
2624 | read_unlock_bh(&xfrm_policy_lock); | |
2625 | ||
2626 | return ret; | |
2627 | } | |
2628 | ||
2629 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2630 | { | |
2631 | int match = 0; | |
2632 | ||
2633 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2634 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2635 | switch (t->mode) { | |
2636 | case XFRM_MODE_TUNNEL: | |
2637 | case XFRM_MODE_BEET: | |
2638 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2639 | m->old_family) == 0 && | |
2640 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2641 | m->old_family) == 0) { | |
2642 | match = 1; | |
2643 | } | |
2644 | break; | |
2645 | case XFRM_MODE_TRANSPORT: | |
2646 | /* in case of transport mode, template does not store | |
2647 | any IP addresses, hence we just compare mode and | |
2648 | protocol */ | |
2649 | match = 1; | |
2650 | break; | |
2651 | default: | |
2652 | break; | |
2653 | } | |
2654 | } | |
2655 | return match; | |
2656 | } | |
2657 | ||
2658 | /* update endpoint address(es) of template(s) */ | |
2659 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2660 | struct xfrm_migrate *m, int num_migrate) | |
2661 | { | |
2662 | struct xfrm_migrate *mp; | |
2663 | struct dst_entry *dst; | |
2664 | int i, j, n = 0; | |
2665 | ||
2666 | write_lock_bh(&pol->lock); | |
12a169e7 | 2667 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
2668 | /* target policy has been deleted */ |
2669 | write_unlock_bh(&pol->lock); | |
2670 | return -ENOENT; | |
2671 | } | |
2672 | ||
2673 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2674 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2675 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2676 | continue; | |
2677 | n++; | |
1bfcb10f HX |
2678 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2679 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2680 | continue; |
2681 | /* update endpoints */ | |
2682 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2683 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2684 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2685 | sizeof(pol->xfrm_vec[i].saddr)); | |
2686 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2687 | /* flush bundles */ | |
2688 | while ((dst = pol->bundles) != NULL) { | |
2689 | pol->bundles = dst->next; | |
2690 | dst_free(dst); | |
2691 | } | |
2692 | } | |
2693 | } | |
2694 | ||
2695 | write_unlock_bh(&pol->lock); | |
2696 | ||
2697 | if (!n) | |
2698 | return -ENODATA; | |
2699 | ||
2700 | return 0; | |
2701 | } | |
2702 | ||
2703 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2704 | { | |
2705 | int i, j; | |
2706 | ||
2707 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2708 | return -EINVAL; | |
2709 | ||
2710 | for (i = 0; i < num_migrate; i++) { | |
2711 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2712 | m[i].old_family) == 0) && | |
2713 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2714 | m[i].old_family) == 0)) | |
2715 | return -EINVAL; | |
2716 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2717 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2718 | return -EINVAL; | |
2719 | ||
2720 | /* check if there is any duplicated entry */ | |
2721 | for (j = i + 1; j < num_migrate; j++) { | |
2722 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2723 | sizeof(m[i].old_daddr)) && | |
2724 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2725 | sizeof(m[i].old_saddr)) && | |
2726 | m[i].proto == m[j].proto && | |
2727 | m[i].mode == m[j].mode && | |
2728 | m[i].reqid == m[j].reqid && | |
2729 | m[i].old_family == m[j].old_family) | |
2730 | return -EINVAL; | |
2731 | } | |
2732 | } | |
2733 | ||
2734 | return 0; | |
2735 | } | |
2736 | ||
2737 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
13c1d189 AE |
2738 | struct xfrm_migrate *m, int num_migrate, |
2739 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
2740 | { |
2741 | int i, err, nx_cur = 0, nx_new = 0; | |
2742 | struct xfrm_policy *pol = NULL; | |
2743 | struct xfrm_state *x, *xc; | |
2744 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2745 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2746 | struct xfrm_migrate *mp; | |
2747 | ||
2748 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2749 | goto out; | |
2750 | ||
2751 | /* Stage 1 - find policy */ | |
2752 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2753 | err = -ENOENT; | |
2754 | goto out; | |
2755 | } | |
2756 | ||
2757 | /* Stage 2 - find and update state(s) */ | |
2758 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2759 | if ((x = xfrm_migrate_state_find(mp))) { | |
2760 | x_cur[nx_cur] = x; | |
2761 | nx_cur++; | |
2762 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2763 | x_new[nx_new] = xc; | |
2764 | nx_new++; | |
2765 | } else { | |
2766 | err = -ENODATA; | |
2767 | goto restore_state; | |
2768 | } | |
2769 | } | |
2770 | } | |
2771 | ||
2772 | /* Stage 3 - update policy */ | |
2773 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2774 | goto restore_state; | |
2775 | ||
2776 | /* Stage 4 - delete old state(s) */ | |
2777 | if (nx_cur) { | |
2778 | xfrm_states_put(x_cur, nx_cur); | |
2779 | xfrm_states_delete(x_cur, nx_cur); | |
2780 | } | |
2781 | ||
2782 | /* Stage 5 - announce */ | |
13c1d189 | 2783 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
2784 | |
2785 | xfrm_pol_put(pol); | |
2786 | ||
2787 | return 0; | |
2788 | out: | |
2789 | return err; | |
2790 | ||
2791 | restore_state: | |
2792 | if (pol) | |
2793 | xfrm_pol_put(pol); | |
2794 | if (nx_cur) | |
2795 | xfrm_states_put(x_cur, nx_cur); | |
2796 | if (nx_new) | |
2797 | xfrm_states_delete(x_new, nx_new); | |
2798 | ||
2799 | return err; | |
2800 | } | |
e610e679 | 2801 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2802 | #endif |