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