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 | ||
2518c7c2 DM |
49 | unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
50 | EXPORT_SYMBOL(xfrm_policy_count); | |
1da177e4 LT |
51 | |
52 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); | |
53 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
54 | ||
e18b890b | 55 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 | 56 | |
2518c7c2 | 57 | static HLIST_HEAD(xfrm_policy_gc_list); |
1da177e4 LT |
58 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); |
59 | ||
60 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
61 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
25ee3286 | 62 | static void xfrm_init_pmtu(struct dst_entry *dst); |
1da177e4 | 63 | |
77681021 AM |
64 | static inline int |
65 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
66 | { | |
67 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
68 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
69 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
70 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
71 | (fl->proto == sel->proto || !sel->proto) && | |
72 | (fl->oif == sel->ifindex || !sel->ifindex); | |
73 | } | |
74 | ||
75 | static inline int | |
76 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
77 | { | |
78 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
79 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
80 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
81 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
82 | (fl->proto == sel->proto || !sel->proto) && | |
83 | (fl->oif == sel->ifindex || !sel->ifindex); | |
84 | } | |
85 | ||
86 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
87 | unsigned short family) | |
88 | { | |
89 | switch (family) { | |
90 | case AF_INET: | |
91 | return __xfrm4_selector_match(sel, fl); | |
92 | case AF_INET6: | |
93 | return __xfrm6_selector_match(sel, fl); | |
94 | } | |
95 | return 0; | |
96 | } | |
97 | ||
9bb182a7 YH |
98 | static inline struct dst_entry *__xfrm_dst_lookup(int tos, |
99 | xfrm_address_t *saddr, | |
100 | xfrm_address_t *daddr, | |
101 | int family) | |
102 | { | |
103 | struct xfrm_policy_afinfo *afinfo; | |
104 | struct dst_entry *dst; | |
105 | ||
106 | afinfo = xfrm_policy_get_afinfo(family); | |
107 | if (unlikely(afinfo == NULL)) | |
108 | return ERR_PTR(-EAFNOSUPPORT); | |
109 | ||
110 | dst = afinfo->dst_lookup(tos, saddr, daddr); | |
111 | ||
112 | xfrm_policy_put_afinfo(afinfo); | |
113 | ||
114 | return dst; | |
115 | } | |
116 | ||
25ee3286 | 117 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
9bb182a7 YH |
118 | xfrm_address_t *prev_saddr, |
119 | xfrm_address_t *prev_daddr, | |
25ee3286 | 120 | int family) |
1da177e4 | 121 | { |
66cdb3ca HX |
122 | xfrm_address_t *saddr = &x->props.saddr; |
123 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
124 | struct dst_entry *dst; |
125 | ||
9bb182a7 | 126 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 127 | saddr = x->coaddr; |
9bb182a7 YH |
128 | daddr = prev_daddr; |
129 | } | |
130 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
131 | saddr = prev_saddr; | |
66cdb3ca | 132 | daddr = x->coaddr; |
9bb182a7 | 133 | } |
1da177e4 | 134 | |
9bb182a7 YH |
135 | dst = __xfrm_dst_lookup(tos, saddr, daddr, family); |
136 | ||
137 | if (!IS_ERR(dst)) { | |
138 | if (prev_saddr != saddr) | |
139 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
140 | if (prev_daddr != daddr) | |
141 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
142 | } | |
1da177e4 | 143 | |
66cdb3ca | 144 | return dst; |
1da177e4 | 145 | } |
1da177e4 | 146 | |
1da177e4 LT |
147 | static inline unsigned long make_jiffies(long secs) |
148 | { | |
149 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
150 | return MAX_SCHEDULE_TIMEOUT-1; | |
151 | else | |
a716c119 | 152 | return secs*HZ; |
1da177e4 LT |
153 | } |
154 | ||
155 | static void xfrm_policy_timer(unsigned long data) | |
156 | { | |
157 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 158 | unsigned long now = get_seconds(); |
1da177e4 LT |
159 | long next = LONG_MAX; |
160 | int warn = 0; | |
161 | int dir; | |
162 | ||
163 | read_lock(&xp->lock); | |
164 | ||
12a169e7 | 165 | if (xp->walk.dead) |
1da177e4 LT |
166 | goto out; |
167 | ||
77d8d7a6 | 168 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
169 | |
170 | if (xp->lft.hard_add_expires_seconds) { | |
171 | long tmo = xp->lft.hard_add_expires_seconds + | |
172 | xp->curlft.add_time - now; | |
173 | if (tmo <= 0) | |
174 | goto expired; | |
175 | if (tmo < next) | |
176 | next = tmo; | |
177 | } | |
178 | if (xp->lft.hard_use_expires_seconds) { | |
179 | long tmo = xp->lft.hard_use_expires_seconds + | |
180 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
181 | if (tmo <= 0) | |
182 | goto expired; | |
183 | if (tmo < next) | |
184 | next = tmo; | |
185 | } | |
186 | if (xp->lft.soft_add_expires_seconds) { | |
187 | long tmo = xp->lft.soft_add_expires_seconds + | |
188 | xp->curlft.add_time - now; | |
189 | if (tmo <= 0) { | |
190 | warn = 1; | |
191 | tmo = XFRM_KM_TIMEOUT; | |
192 | } | |
193 | if (tmo < next) | |
194 | next = tmo; | |
195 | } | |
196 | if (xp->lft.soft_use_expires_seconds) { | |
197 | long tmo = xp->lft.soft_use_expires_seconds + | |
198 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
199 | if (tmo <= 0) { | |
200 | warn = 1; | |
201 | tmo = XFRM_KM_TIMEOUT; | |
202 | } | |
203 | if (tmo < next) | |
204 | next = tmo; | |
205 | } | |
206 | ||
207 | if (warn) | |
6c5c8ca7 | 208 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
209 | if (next != LONG_MAX && |
210 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
211 | xfrm_pol_hold(xp); | |
212 | ||
213 | out: | |
214 | read_unlock(&xp->lock); | |
215 | xfrm_pol_put(xp); | |
216 | return; | |
217 | ||
218 | expired: | |
219 | read_unlock(&xp->lock); | |
4666faab | 220 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 221 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
222 | xfrm_pol_put(xp); |
223 | } | |
224 | ||
225 | ||
226 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
227 | * SPD calls. | |
228 | */ | |
229 | ||
0331b1f3 | 230 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
231 | { |
232 | struct xfrm_policy *policy; | |
233 | ||
0da974f4 | 234 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
235 | |
236 | if (policy) { | |
0331b1f3 | 237 | write_pnet(&policy->xp_net, net); |
12a169e7 | 238 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
239 | INIT_HLIST_NODE(&policy->bydst); |
240 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 241 | rwlock_init(&policy->lock); |
2518c7c2 | 242 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
243 | setup_timer(&policy->timer, xfrm_policy_timer, |
244 | (unsigned long)policy); | |
1da177e4 LT |
245 | } |
246 | return policy; | |
247 | } | |
248 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
249 | ||
250 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
251 | ||
64c31b3f | 252 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 253 | { |
12a169e7 | 254 | BUG_ON(!policy->walk.dead); |
1da177e4 | 255 | |
09a62660 | 256 | BUG_ON(policy->bundles); |
1da177e4 LT |
257 | |
258 | if (del_timer(&policy->timer)) | |
259 | BUG(); | |
260 | ||
03e1ad7b | 261 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
262 | kfree(policy); |
263 | } | |
64c31b3f | 264 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 LT |
265 | |
266 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
267 | { | |
268 | struct dst_entry *dst; | |
269 | ||
270 | while ((dst = policy->bundles) != NULL) { | |
271 | policy->bundles = dst->next; | |
272 | dst_free(dst); | |
273 | } | |
274 | ||
275 | if (del_timer(&policy->timer)) | |
276 | atomic_dec(&policy->refcnt); | |
277 | ||
278 | if (atomic_read(&policy->refcnt) > 1) | |
279 | flow_cache_flush(); | |
280 | ||
281 | xfrm_pol_put(policy); | |
282 | } | |
283 | ||
c4028958 | 284 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
285 | { |
286 | struct xfrm_policy *policy; | |
2518c7c2 DM |
287 | struct hlist_node *entry, *tmp; |
288 | struct hlist_head gc_list; | |
1da177e4 LT |
289 | |
290 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
291 | gc_list.first = xfrm_policy_gc_list.first; |
292 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
293 | spin_unlock_bh(&xfrm_policy_gc_lock); |
294 | ||
2518c7c2 | 295 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 296 | xfrm_policy_gc_kill(policy); |
1da177e4 | 297 | } |
c9583969 | 298 | static DECLARE_WORK(xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
299 | |
300 | /* Rule must be locked. Release descentant resources, announce | |
301 | * entry dead. The rule must be unlinked from lists to the moment. | |
302 | */ | |
303 | ||
304 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
305 | { | |
306 | int dead; | |
307 | ||
308 | write_lock_bh(&policy->lock); | |
12a169e7 HX |
309 | dead = policy->walk.dead; |
310 | policy->walk.dead = 1; | |
1da177e4 LT |
311 | write_unlock_bh(&policy->lock); |
312 | ||
313 | if (unlikely(dead)) { | |
314 | WARN_ON(1); | |
315 | return; | |
316 | } | |
317 | ||
bbb770e7 | 318 | spin_lock_bh(&xfrm_policy_gc_lock); |
2518c7c2 | 319 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
bbb770e7 | 320 | spin_unlock_bh(&xfrm_policy_gc_lock); |
1da177e4 LT |
321 | |
322 | schedule_work(&xfrm_policy_gc_work); | |
323 | } | |
324 | ||
2518c7c2 DM |
325 | struct xfrm_policy_hash { |
326 | struct hlist_head *table; | |
327 | unsigned int hmask; | |
328 | }; | |
329 | ||
330 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; | |
331 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; | |
2518c7c2 DM |
332 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
333 | ||
2518c7c2 DM |
334 | static inline unsigned int idx_hash(u32 index) |
335 | { | |
8100bea7 | 336 | return __idx_hash(index, init_net.xfrm.policy_idx_hmask); |
2518c7c2 DM |
337 | } |
338 | ||
2518c7c2 DM |
339 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
340 | { | |
341 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
342 | unsigned int hash = __sel_hash(sel, family, hmask); | |
343 | ||
344 | return (hash == hmask + 1 ? | |
345 | &xfrm_policy_inexact[dir] : | |
346 | xfrm_policy_bydst[dir].table + hash); | |
347 | } | |
348 | ||
349 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) | |
350 | { | |
351 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
352 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); | |
353 | ||
354 | return xfrm_policy_bydst[dir].table + hash; | |
355 | } | |
356 | ||
2518c7c2 DM |
357 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
358 | struct hlist_head *ndsttable, | |
359 | unsigned int nhashmask) | |
360 | { | |
b791160b | 361 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 362 | struct xfrm_policy *pol; |
b791160b | 363 | unsigned int h0 = 0; |
2518c7c2 | 364 | |
b791160b | 365 | redo: |
2518c7c2 DM |
366 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
367 | unsigned int h; | |
368 | ||
369 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
370 | pol->family, nhashmask); | |
b791160b YH |
371 | if (!entry0) { |
372 | hlist_del(entry); | |
373 | hlist_add_head(&pol->bydst, ndsttable+h); | |
374 | h0 = h; | |
375 | } else { | |
376 | if (h != h0) | |
377 | continue; | |
378 | hlist_del(entry); | |
379 | hlist_add_after(entry0, &pol->bydst); | |
380 | } | |
381 | entry0 = entry; | |
382 | } | |
383 | if (!hlist_empty(list)) { | |
384 | entry0 = NULL; | |
385 | goto redo; | |
2518c7c2 DM |
386 | } |
387 | } | |
388 | ||
389 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
390 | struct hlist_head *nidxtable, | |
391 | unsigned int nhashmask) | |
392 | { | |
393 | struct hlist_node *entry, *tmp; | |
394 | struct xfrm_policy *pol; | |
395 | ||
396 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
397 | unsigned int h; | |
398 | ||
399 | h = __idx_hash(pol->index, nhashmask); | |
400 | hlist_add_head(&pol->byidx, nidxtable+h); | |
401 | } | |
402 | } | |
403 | ||
404 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
405 | { | |
406 | return ((old_hmask + 1) << 1) - 1; | |
407 | } | |
408 | ||
409 | static void xfrm_bydst_resize(int dir) | |
410 | { | |
411 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
412 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
413 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
414 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; | |
44e36b42 | 415 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
416 | int i; |
417 | ||
418 | if (!ndst) | |
419 | return; | |
420 | ||
421 | write_lock_bh(&xfrm_policy_lock); | |
422 | ||
423 | for (i = hmask; i >= 0; i--) | |
424 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
425 | ||
426 | xfrm_policy_bydst[dir].table = ndst; | |
427 | xfrm_policy_bydst[dir].hmask = nhashmask; | |
428 | ||
429 | write_unlock_bh(&xfrm_policy_lock); | |
430 | ||
44e36b42 | 431 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
432 | } |
433 | ||
434 | static void xfrm_byidx_resize(int total) | |
435 | { | |
8100bea7 | 436 | unsigned int hmask = init_net.xfrm.policy_idx_hmask; |
2518c7c2 DM |
437 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
438 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
93b851c1 | 439 | struct hlist_head *oidx = init_net.xfrm.policy_byidx; |
44e36b42 | 440 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
441 | int i; |
442 | ||
443 | if (!nidx) | |
444 | return; | |
445 | ||
446 | write_lock_bh(&xfrm_policy_lock); | |
447 | ||
448 | for (i = hmask; i >= 0; i--) | |
449 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
450 | ||
93b851c1 | 451 | init_net.xfrm.policy_byidx = nidx; |
8100bea7 | 452 | init_net.xfrm.policy_idx_hmask = nhashmask; |
2518c7c2 DM |
453 | |
454 | write_unlock_bh(&xfrm_policy_lock); | |
455 | ||
44e36b42 | 456 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
457 | } |
458 | ||
459 | static inline int xfrm_bydst_should_resize(int dir, int *total) | |
460 | { | |
461 | unsigned int cnt = xfrm_policy_count[dir]; | |
462 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
463 | ||
464 | if (total) | |
465 | *total += cnt; | |
466 | ||
467 | if ((hmask + 1) < xfrm_policy_hashmax && | |
468 | cnt > hmask) | |
469 | return 1; | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | static inline int xfrm_byidx_should_resize(int total) | |
475 | { | |
8100bea7 | 476 | unsigned int hmask = init_net.xfrm.policy_idx_hmask; |
2518c7c2 DM |
477 | |
478 | if ((hmask + 1) < xfrm_policy_hashmax && | |
479 | total > hmask) | |
480 | return 1; | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
5a6d3416 | 485 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
486 | { |
487 | read_lock_bh(&xfrm_policy_lock); | |
488 | si->incnt = xfrm_policy_count[XFRM_POLICY_IN]; | |
489 | si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT]; | |
490 | si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD]; | |
491 | si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
492 | si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
493 | si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
8100bea7 | 494 | si->spdhcnt = init_net.xfrm.policy_idx_hmask; |
ecfd6b18 JHS |
495 | si->spdhmcnt = xfrm_policy_hashmax; |
496 | read_unlock_bh(&xfrm_policy_lock); | |
497 | } | |
498 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 499 | |
ecfd6b18 | 500 | static DEFINE_MUTEX(hash_resize_mutex); |
c4028958 | 501 | static void xfrm_hash_resize(struct work_struct *__unused) |
2518c7c2 DM |
502 | { |
503 | int dir, total; | |
504 | ||
505 | mutex_lock(&hash_resize_mutex); | |
506 | ||
507 | total = 0; | |
508 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
509 | if (xfrm_bydst_should_resize(dir, &total)) | |
510 | xfrm_bydst_resize(dir); | |
511 | } | |
512 | if (xfrm_byidx_should_resize(total)) | |
513 | xfrm_byidx_resize(total); | |
514 | ||
515 | mutex_unlock(&hash_resize_mutex); | |
516 | } | |
517 | ||
c4028958 | 518 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
2518c7c2 | 519 | |
1da177e4 LT |
520 | /* Generate new index... KAME seems to generate them ordered by cost |
521 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
7a12122c | 522 | static u32 xfrm_gen_index(int dir) |
1da177e4 | 523 | { |
1da177e4 LT |
524 | static u32 idx_generator; |
525 | ||
526 | for (;;) { | |
2518c7c2 DM |
527 | struct hlist_node *entry; |
528 | struct hlist_head *list; | |
529 | struct xfrm_policy *p; | |
530 | u32 idx; | |
531 | int found; | |
532 | ||
1da177e4 LT |
533 | idx = (idx_generator | dir); |
534 | idx_generator += 8; | |
535 | if (idx == 0) | |
536 | idx = 8; | |
93b851c1 | 537 | list = init_net.xfrm.policy_byidx + idx_hash(idx); |
2518c7c2 DM |
538 | found = 0; |
539 | hlist_for_each_entry(p, entry, list, byidx) { | |
540 | if (p->index == idx) { | |
541 | found = 1; | |
1da177e4 | 542 | break; |
2518c7c2 | 543 | } |
1da177e4 | 544 | } |
2518c7c2 | 545 | if (!found) |
1da177e4 LT |
546 | return idx; |
547 | } | |
548 | } | |
549 | ||
2518c7c2 DM |
550 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
551 | { | |
552 | u32 *p1 = (u32 *) s1; | |
553 | u32 *p2 = (u32 *) s2; | |
554 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
555 | int i; | |
556 | ||
557 | for (i = 0; i < len; i++) { | |
558 | if (p1[i] != p2[i]) | |
559 | return 1; | |
560 | } | |
561 | ||
562 | return 0; | |
563 | } | |
564 | ||
1da177e4 LT |
565 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
566 | { | |
2518c7c2 DM |
567 | struct xfrm_policy *pol; |
568 | struct xfrm_policy *delpol; | |
569 | struct hlist_head *chain; | |
a6c7ab55 | 570 | struct hlist_node *entry, *newpos; |
9b78a82c | 571 | struct dst_entry *gc_list; |
1da177e4 LT |
572 | |
573 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
574 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
575 | delpol = NULL; | |
576 | newpos = NULL; | |
2518c7c2 | 577 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 578 | if (pol->type == policy->type && |
2518c7c2 | 579 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
580 | xfrm_sec_ctx_match(pol->security, policy->security) && |
581 | !WARN_ON(delpol)) { | |
1da177e4 LT |
582 | if (excl) { |
583 | write_unlock_bh(&xfrm_policy_lock); | |
584 | return -EEXIST; | |
585 | } | |
1da177e4 LT |
586 | delpol = pol; |
587 | if (policy->priority > pol->priority) | |
588 | continue; | |
589 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 590 | newpos = &pol->bydst; |
1da177e4 LT |
591 | continue; |
592 | } | |
1da177e4 LT |
593 | if (delpol) |
594 | break; | |
1da177e4 LT |
595 | } |
596 | if (newpos) | |
2518c7c2 DM |
597 | hlist_add_after(newpos, &policy->bydst); |
598 | else | |
599 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 600 | xfrm_pol_hold(policy); |
2518c7c2 | 601 | xfrm_policy_count[dir]++; |
1da177e4 | 602 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
603 | if (delpol) { |
604 | hlist_del(&delpol->bydst); | |
605 | hlist_del(&delpol->byidx); | |
12a169e7 | 606 | list_del(&delpol->walk.all); |
2518c7c2 DM |
607 | xfrm_policy_count[dir]--; |
608 | } | |
7a12122c | 609 | policy->index = delpol ? delpol->index : xfrm_gen_index(dir); |
93b851c1 | 610 | hlist_add_head(&policy->byidx, init_net.xfrm.policy_byidx+idx_hash(policy->index)); |
9d729f72 | 611 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
612 | policy->curlft.use_time = 0; |
613 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
614 | xfrm_pol_hold(policy); | |
adfcf0b2 | 615 | list_add(&policy->walk.all, &init_net.xfrm.policy_all); |
1da177e4 LT |
616 | write_unlock_bh(&xfrm_policy_lock); |
617 | ||
9b78a82c | 618 | if (delpol) |
1da177e4 | 619 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
620 | else if (xfrm_bydst_should_resize(dir, NULL)) |
621 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
622 | |
623 | read_lock_bh(&xfrm_policy_lock); | |
624 | gc_list = NULL; | |
2518c7c2 DM |
625 | entry = &policy->bydst; |
626 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
627 | struct dst_entry *dst; |
628 | ||
629 | write_lock(&policy->lock); | |
630 | dst = policy->bundles; | |
631 | if (dst) { | |
632 | struct dst_entry *tail = dst; | |
633 | while (tail->next) | |
634 | tail = tail->next; | |
635 | tail->next = gc_list; | |
636 | gc_list = dst; | |
637 | ||
638 | policy->bundles = NULL; | |
639 | } | |
640 | write_unlock(&policy->lock); | |
1da177e4 | 641 | } |
9b78a82c DM |
642 | read_unlock_bh(&xfrm_policy_lock); |
643 | ||
644 | while (gc_list) { | |
645 | struct dst_entry *dst = gc_list; | |
646 | ||
647 | gc_list = dst->next; | |
648 | dst_free(dst); | |
649 | } | |
650 | ||
1da177e4 LT |
651 | return 0; |
652 | } | |
653 | EXPORT_SYMBOL(xfrm_policy_insert); | |
654 | ||
4e81bb83 MN |
655 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
656 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
657 | struct xfrm_sec_ctx *ctx, int delete, |
658 | int *err) | |
1da177e4 | 659 | { |
2518c7c2 DM |
660 | struct xfrm_policy *pol, *ret; |
661 | struct hlist_head *chain; | |
662 | struct hlist_node *entry; | |
1da177e4 | 663 | |
ef41aaa0 | 664 | *err = 0; |
1da177e4 | 665 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
666 | chain = policy_hash_bysel(sel, sel->family, dir); |
667 | ret = NULL; | |
668 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
669 | if (pol->type == type && | |
670 | !selector_cmp(sel, &pol->selector) && | |
671 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 672 | xfrm_pol_hold(pol); |
2518c7c2 | 673 | if (delete) { |
03e1ad7b PM |
674 | *err = security_xfrm_policy_delete( |
675 | pol->security); | |
ef41aaa0 EP |
676 | if (*err) { |
677 | write_unlock_bh(&xfrm_policy_lock); | |
678 | return pol; | |
679 | } | |
2518c7c2 DM |
680 | hlist_del(&pol->bydst); |
681 | hlist_del(&pol->byidx); | |
12a169e7 | 682 | list_del(&pol->walk.all); |
2518c7c2 DM |
683 | xfrm_policy_count[dir]--; |
684 | } | |
685 | ret = pol; | |
1da177e4 LT |
686 | break; |
687 | } | |
688 | } | |
689 | write_unlock_bh(&xfrm_policy_lock); | |
690 | ||
2518c7c2 | 691 | if (ret && delete) { |
1da177e4 | 692 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 693 | xfrm_policy_kill(ret); |
1da177e4 | 694 | } |
2518c7c2 | 695 | return ret; |
1da177e4 | 696 | } |
df71837d | 697 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 698 | |
ef41aaa0 EP |
699 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
700 | int *err) | |
1da177e4 | 701 | { |
2518c7c2 DM |
702 | struct xfrm_policy *pol, *ret; |
703 | struct hlist_head *chain; | |
704 | struct hlist_node *entry; | |
1da177e4 | 705 | |
b5505c6e HX |
706 | *err = -ENOENT; |
707 | if (xfrm_policy_id2dir(id) != dir) | |
708 | return NULL; | |
709 | ||
ef41aaa0 | 710 | *err = 0; |
1da177e4 | 711 | write_lock_bh(&xfrm_policy_lock); |
93b851c1 | 712 | chain = init_net.xfrm.policy_byidx + idx_hash(id); |
2518c7c2 DM |
713 | ret = NULL; |
714 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
715 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 716 | xfrm_pol_hold(pol); |
2518c7c2 | 717 | if (delete) { |
03e1ad7b PM |
718 | *err = security_xfrm_policy_delete( |
719 | pol->security); | |
ef41aaa0 EP |
720 | if (*err) { |
721 | write_unlock_bh(&xfrm_policy_lock); | |
722 | return pol; | |
723 | } | |
2518c7c2 DM |
724 | hlist_del(&pol->bydst); |
725 | hlist_del(&pol->byidx); | |
12a169e7 | 726 | list_del(&pol->walk.all); |
2518c7c2 DM |
727 | xfrm_policy_count[dir]--; |
728 | } | |
729 | ret = pol; | |
1da177e4 LT |
730 | break; |
731 | } | |
732 | } | |
733 | write_unlock_bh(&xfrm_policy_lock); | |
734 | ||
2518c7c2 | 735 | if (ret && delete) { |
1da177e4 | 736 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 737 | xfrm_policy_kill(ret); |
1da177e4 | 738 | } |
2518c7c2 | 739 | return ret; |
1da177e4 LT |
740 | } |
741 | EXPORT_SYMBOL(xfrm_policy_byid); | |
742 | ||
4aa2e62c JL |
743 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
744 | static inline int | |
745 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
1da177e4 | 746 | { |
4aa2e62c JL |
747 | int dir, err = 0; |
748 | ||
749 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
750 | struct xfrm_policy *pol; | |
751 | struct hlist_node *entry; | |
752 | int i; | |
753 | ||
754 | hlist_for_each_entry(pol, entry, | |
755 | &xfrm_policy_inexact[dir], bydst) { | |
756 | if (pol->type != type) | |
757 | continue; | |
03e1ad7b | 758 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 759 | if (err) { |
ab5f5e8b JL |
760 | xfrm_audit_policy_delete(pol, 0, |
761 | audit_info->loginuid, | |
2532386f | 762 | audit_info->sessionid, |
ab5f5e8b | 763 | audit_info->secid); |
4aa2e62c JL |
764 | return err; |
765 | } | |
7dc12d6d | 766 | } |
4aa2e62c JL |
767 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
768 | hlist_for_each_entry(pol, entry, | |
769 | xfrm_policy_bydst[dir].table + i, | |
770 | bydst) { | |
771 | if (pol->type != type) | |
772 | continue; | |
03e1ad7b PM |
773 | err = security_xfrm_policy_delete( |
774 | pol->security); | |
4aa2e62c | 775 | if (err) { |
ab5f5e8b JL |
776 | xfrm_audit_policy_delete(pol, 0, |
777 | audit_info->loginuid, | |
2532386f | 778 | audit_info->sessionid, |
ab5f5e8b | 779 | audit_info->secid); |
4aa2e62c JL |
780 | return err; |
781 | } | |
782 | } | |
783 | } | |
784 | } | |
785 | return err; | |
786 | } | |
787 | #else | |
788 | static inline int | |
789 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
790 | { | |
791 | return 0; | |
792 | } | |
793 | #endif | |
794 | ||
795 | int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) | |
796 | { | |
797 | int dir, err = 0; | |
1da177e4 LT |
798 | |
799 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c JL |
800 | |
801 | err = xfrm_policy_flush_secctx_check(type, audit_info); | |
802 | if (err) | |
803 | goto out; | |
804 | ||
1da177e4 | 805 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
806 | struct xfrm_policy *pol; |
807 | struct hlist_node *entry; | |
ae8c0577 | 808 | int i, killed; |
2518c7c2 | 809 | |
ae8c0577 | 810 | killed = 0; |
2518c7c2 DM |
811 | again1: |
812 | hlist_for_each_entry(pol, entry, | |
813 | &xfrm_policy_inexact[dir], bydst) { | |
814 | if (pol->type != type) | |
815 | continue; | |
816 | hlist_del(&pol->bydst); | |
817 | hlist_del(&pol->byidx); | |
1da177e4 LT |
818 | write_unlock_bh(&xfrm_policy_lock); |
819 | ||
ab5f5e8b | 820 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 821 | audit_info->sessionid, |
ab5f5e8b | 822 | audit_info->secid); |
161a09e7 | 823 | |
2518c7c2 | 824 | xfrm_policy_kill(pol); |
ae8c0577 | 825 | killed++; |
1da177e4 LT |
826 | |
827 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
828 | goto again1; |
829 | } | |
830 | ||
831 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
832 | again2: | |
833 | hlist_for_each_entry(pol, entry, | |
834 | xfrm_policy_bydst[dir].table + i, | |
835 | bydst) { | |
836 | if (pol->type != type) | |
837 | continue; | |
838 | hlist_del(&pol->bydst); | |
839 | hlist_del(&pol->byidx); | |
12a169e7 | 840 | list_del(&pol->walk.all); |
2518c7c2 DM |
841 | write_unlock_bh(&xfrm_policy_lock); |
842 | ||
ab5f5e8b JL |
843 | xfrm_audit_policy_delete(pol, 1, |
844 | audit_info->loginuid, | |
2532386f | 845 | audit_info->sessionid, |
ab5f5e8b | 846 | audit_info->secid); |
2518c7c2 | 847 | xfrm_policy_kill(pol); |
ae8c0577 | 848 | killed++; |
2518c7c2 DM |
849 | |
850 | write_lock_bh(&xfrm_policy_lock); | |
851 | goto again2; | |
852 | } | |
1da177e4 | 853 | } |
2518c7c2 | 854 | |
ae8c0577 | 855 | xfrm_policy_count[dir] -= killed; |
1da177e4 LT |
856 | } |
857 | atomic_inc(&flow_cache_genid); | |
4aa2e62c | 858 | out: |
1da177e4 | 859 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 860 | return err; |
1da177e4 LT |
861 | } |
862 | EXPORT_SYMBOL(xfrm_policy_flush); | |
863 | ||
4c563f76 TT |
864 | int xfrm_policy_walk(struct xfrm_policy_walk *walk, |
865 | int (*func)(struct xfrm_policy *, int, int, void*), | |
1da177e4 LT |
866 | void *data) |
867 | { | |
12a169e7 HX |
868 | struct xfrm_policy *pol; |
869 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
870 | int error = 0; |
871 | ||
872 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
873 | walk->type != XFRM_POLICY_TYPE_ANY) | |
874 | return -EINVAL; | |
1da177e4 | 875 | |
12a169e7 | 876 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
877 | return 0; |
878 | ||
12a169e7 HX |
879 | write_lock_bh(&xfrm_policy_lock); |
880 | if (list_empty(&walk->walk.all)) | |
adfcf0b2 | 881 | x = list_first_entry(&init_net.xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
882 | else |
883 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
adfcf0b2 | 884 | list_for_each_entry_from(x, &init_net.xfrm.policy_all, all) { |
12a169e7 | 885 | if (x->dead) |
4c563f76 | 886 | continue; |
12a169e7 HX |
887 | pol = container_of(x, struct xfrm_policy, walk); |
888 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
889 | walk->type != pol->type) | |
890 | continue; | |
891 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
892 | walk->seq, data); | |
893 | if (error) { | |
894 | list_move_tail(&walk->walk.all, &x->all); | |
895 | goto out; | |
2518c7c2 | 896 | } |
12a169e7 | 897 | walk->seq++; |
1da177e4 | 898 | } |
12a169e7 | 899 | if (walk->seq == 0) { |
baf5d743 JHS |
900 | error = -ENOENT; |
901 | goto out; | |
902 | } | |
12a169e7 | 903 | list_del_init(&walk->walk.all); |
1da177e4 | 904 | out: |
12a169e7 | 905 | write_unlock_bh(&xfrm_policy_lock); |
1da177e4 LT |
906 | return error; |
907 | } | |
908 | EXPORT_SYMBOL(xfrm_policy_walk); | |
909 | ||
12a169e7 HX |
910 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
911 | { | |
912 | INIT_LIST_HEAD(&walk->walk.all); | |
913 | walk->walk.dead = 1; | |
914 | walk->type = type; | |
915 | walk->seq = 0; | |
916 | } | |
917 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
918 | ||
919 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
920 | { | |
921 | if (list_empty(&walk->walk.all)) | |
922 | return; | |
923 | ||
924 | write_lock_bh(&xfrm_policy_lock); | |
925 | list_del(&walk->walk.all); | |
926 | write_unlock_bh(&xfrm_policy_lock); | |
927 | } | |
928 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
929 | ||
134b0fc5 JM |
930 | /* |
931 | * Find policy to apply to this flow. | |
932 | * | |
933 | * Returns 0 if policy found, else an -errno. | |
934 | */ | |
2518c7c2 DM |
935 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
936 | u8 type, u16 family, int dir) | |
1da177e4 | 937 | { |
2518c7c2 | 938 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 939 | int match, ret = -ESRCH; |
1da177e4 | 940 | |
2518c7c2 DM |
941 | if (pol->family != family || |
942 | pol->type != type) | |
134b0fc5 | 943 | return ret; |
1da177e4 | 944 | |
2518c7c2 | 945 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 946 | if (match) |
03e1ad7b PM |
947 | ret = security_xfrm_policy_lookup(pol->security, fl->secid, |
948 | dir); | |
2518c7c2 | 949 | |
134b0fc5 | 950 | return ret; |
2518c7c2 | 951 | } |
1da177e4 | 952 | |
2518c7c2 DM |
953 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
954 | u16 family, u8 dir) | |
955 | { | |
134b0fc5 | 956 | int err; |
2518c7c2 DM |
957 | struct xfrm_policy *pol, *ret; |
958 | xfrm_address_t *daddr, *saddr; | |
959 | struct hlist_node *entry; | |
960 | struct hlist_head *chain; | |
acba48e1 | 961 | u32 priority = ~0U; |
df71837d | 962 | |
2518c7c2 DM |
963 | daddr = xfrm_flowi_daddr(fl, family); |
964 | saddr = xfrm_flowi_saddr(fl, family); | |
965 | if (unlikely(!daddr || !saddr)) | |
966 | return NULL; | |
967 | ||
968 | read_lock_bh(&xfrm_policy_lock); | |
969 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
970 | ret = NULL; | |
971 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
972 | err = xfrm_policy_match(pol, fl, type, family, dir); |
973 | if (err) { | |
974 | if (err == -ESRCH) | |
975 | continue; | |
976 | else { | |
977 | ret = ERR_PTR(err); | |
978 | goto fail; | |
979 | } | |
980 | } else { | |
2518c7c2 | 981 | ret = pol; |
acba48e1 | 982 | priority = ret->priority; |
2518c7c2 DM |
983 | break; |
984 | } | |
985 | } | |
acba48e1 DM |
986 | chain = &xfrm_policy_inexact[dir]; |
987 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
988 | err = xfrm_policy_match(pol, fl, type, family, dir); |
989 | if (err) { | |
990 | if (err == -ESRCH) | |
991 | continue; | |
992 | else { | |
993 | ret = ERR_PTR(err); | |
994 | goto fail; | |
995 | } | |
996 | } else if (pol->priority < priority) { | |
acba48e1 DM |
997 | ret = pol; |
998 | break; | |
1da177e4 LT |
999 | } |
1000 | } | |
acba48e1 DM |
1001 | if (ret) |
1002 | xfrm_pol_hold(ret); | |
134b0fc5 | 1003 | fail: |
1da177e4 | 1004 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 1005 | |
2518c7c2 | 1006 | return ret; |
4e81bb83 MN |
1007 | } |
1008 | ||
134b0fc5 | 1009 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
1010 | void **objp, atomic_t **obj_refp) |
1011 | { | |
1012 | struct xfrm_policy *pol; | |
134b0fc5 | 1013 | int err = 0; |
4e81bb83 MN |
1014 | |
1015 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1016 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
1017 | if (IS_ERR(pol)) { |
1018 | err = PTR_ERR(pol); | |
1019 | pol = NULL; | |
1020 | } | |
1021 | if (pol || err) | |
4e81bb83 MN |
1022 | goto end; |
1023 | #endif | |
1024 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
1025 | if (IS_ERR(pol)) { |
1026 | err = PTR_ERR(pol); | |
1027 | pol = NULL; | |
1028 | } | |
4e81bb83 | 1029 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1030 | end: |
4e81bb83 | 1031 | #endif |
1da177e4 LT |
1032 | if ((*objp = (void *) pol) != NULL) |
1033 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1034 | return err; |
1da177e4 LT |
1035 | } |
1036 | ||
df71837d TJ |
1037 | static inline int policy_to_flow_dir(int dir) |
1038 | { | |
1039 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1040 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1041 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1042 | return dir; | |
1043 | switch (dir) { | |
1044 | default: | |
1045 | case XFRM_POLICY_IN: | |
1046 | return FLOW_DIR_IN; | |
1047 | case XFRM_POLICY_OUT: | |
1048 | return FLOW_DIR_OUT; | |
1049 | case XFRM_POLICY_FWD: | |
1050 | return FLOW_DIR_FWD; | |
3ff50b79 | 1051 | } |
df71837d TJ |
1052 | } |
1053 | ||
e0d1caa7 | 1054 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1055 | { |
1056 | struct xfrm_policy *pol; | |
1057 | ||
1058 | read_lock_bh(&xfrm_policy_lock); | |
1059 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1060 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1061 | sk->sk_family); |
a716c119 | 1062 | int err = 0; |
df71837d | 1063 | |
3bccfbc7 | 1064 | if (match) { |
03e1ad7b PM |
1065 | err = security_xfrm_policy_lookup(pol->security, |
1066 | fl->secid, | |
1067 | policy_to_flow_dir(dir)); | |
3bccfbc7 VY |
1068 | if (!err) |
1069 | xfrm_pol_hold(pol); | |
1070 | else if (err == -ESRCH) | |
1071 | pol = NULL; | |
1072 | else | |
1073 | pol = ERR_PTR(err); | |
1074 | } else | |
1da177e4 LT |
1075 | pol = NULL; |
1076 | } | |
1077 | read_unlock_bh(&xfrm_policy_lock); | |
1078 | return pol; | |
1079 | } | |
1080 | ||
1081 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1082 | { | |
2518c7c2 DM |
1083 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1084 | pol->family, dir); | |
4e81bb83 | 1085 | |
adfcf0b2 | 1086 | list_add(&pol->walk.all, &init_net.xfrm.policy_all); |
2518c7c2 | 1087 | hlist_add_head(&pol->bydst, chain); |
93b851c1 | 1088 | hlist_add_head(&pol->byidx, init_net.xfrm.policy_byidx+idx_hash(pol->index)); |
2518c7c2 | 1089 | xfrm_policy_count[dir]++; |
1da177e4 | 1090 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1091 | |
1092 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1093 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1094 | } |
1095 | ||
1096 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1097 | int dir) | |
1098 | { | |
2518c7c2 DM |
1099 | if (hlist_unhashed(&pol->bydst)) |
1100 | return NULL; | |
1da177e4 | 1101 | |
2518c7c2 DM |
1102 | hlist_del(&pol->bydst); |
1103 | hlist_del(&pol->byidx); | |
12a169e7 | 1104 | list_del(&pol->walk.all); |
2518c7c2 DM |
1105 | xfrm_policy_count[dir]--; |
1106 | ||
1107 | return pol; | |
1da177e4 LT |
1108 | } |
1109 | ||
4666faab | 1110 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1111 | { |
1112 | write_lock_bh(&xfrm_policy_lock); | |
1113 | pol = __xfrm_policy_unlink(pol, dir); | |
1114 | write_unlock_bh(&xfrm_policy_lock); | |
1115 | if (pol) { | |
1116 | if (dir < XFRM_POLICY_MAX) | |
1117 | atomic_inc(&flow_cache_genid); | |
1118 | xfrm_policy_kill(pol); | |
4666faab | 1119 | return 0; |
1da177e4 | 1120 | } |
4666faab | 1121 | return -ENOENT; |
1da177e4 | 1122 | } |
a70fcb0b | 1123 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1124 | |
1125 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1126 | { | |
1127 | struct xfrm_policy *old_pol; | |
1128 | ||
4e81bb83 MN |
1129 | #ifdef CONFIG_XFRM_SUB_POLICY |
1130 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1131 | return -EINVAL; | |
1132 | #endif | |
1133 | ||
1da177e4 LT |
1134 | write_lock_bh(&xfrm_policy_lock); |
1135 | old_pol = sk->sk_policy[dir]; | |
1136 | sk->sk_policy[dir] = pol; | |
1137 | if (pol) { | |
9d729f72 | 1138 | pol->curlft.add_time = get_seconds(); |
7a12122c | 1139 | pol->index = xfrm_gen_index(XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1140 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1141 | } | |
1142 | if (old_pol) | |
1143 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1144 | write_unlock_bh(&xfrm_policy_lock); | |
1145 | ||
1146 | if (old_pol) { | |
1147 | xfrm_policy_kill(old_pol); | |
1148 | } | |
1149 | return 0; | |
1150 | } | |
1151 | ||
1152 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1153 | { | |
0331b1f3 | 1154 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
1da177e4 LT |
1155 | |
1156 | if (newp) { | |
1157 | newp->selector = old->selector; | |
03e1ad7b PM |
1158 | if (security_xfrm_policy_clone(old->security, |
1159 | &newp->security)) { | |
df71837d TJ |
1160 | kfree(newp); |
1161 | return NULL; /* ENOMEM */ | |
1162 | } | |
1da177e4 LT |
1163 | newp->lft = old->lft; |
1164 | newp->curlft = old->curlft; | |
1165 | newp->action = old->action; | |
1166 | newp->flags = old->flags; | |
1167 | newp->xfrm_nr = old->xfrm_nr; | |
1168 | newp->index = old->index; | |
4e81bb83 | 1169 | newp->type = old->type; |
1da177e4 LT |
1170 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1171 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1172 | write_lock_bh(&xfrm_policy_lock); | |
1173 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1174 | write_unlock_bh(&xfrm_policy_lock); | |
1175 | xfrm_pol_put(newp); | |
1176 | } | |
1177 | return newp; | |
1178 | } | |
1179 | ||
1180 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1181 | { | |
1182 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1183 | *p1 = sk->sk_policy[1]; | |
1184 | ||
1185 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1186 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1187 | return -ENOMEM; | |
1188 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1189 | return -ENOMEM; | |
1190 | return 0; | |
1191 | } | |
1192 | ||
a1e59abf PM |
1193 | static int |
1194 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1195 | unsigned short family) | |
1196 | { | |
1197 | int err; | |
1198 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1199 | ||
1200 | if (unlikely(afinfo == NULL)) | |
1201 | return -EINVAL; | |
1202 | err = afinfo->get_saddr(local, remote); | |
1203 | xfrm_policy_put_afinfo(afinfo); | |
1204 | return err; | |
1205 | } | |
1206 | ||
1da177e4 LT |
1207 | /* Resolve list of templates for the flow, given policy. */ |
1208 | ||
1209 | static int | |
4e81bb83 MN |
1210 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1211 | struct xfrm_state **xfrm, | |
1212 | unsigned short family) | |
1da177e4 LT |
1213 | { |
1214 | int nx; | |
1215 | int i, error; | |
1216 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1217 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1218 | xfrm_address_t tmp; |
1da177e4 LT |
1219 | |
1220 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1221 | struct xfrm_state *x; | |
1222 | xfrm_address_t *remote = daddr; | |
1223 | xfrm_address_t *local = saddr; | |
1224 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1225 | ||
48b8d783 JK |
1226 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1227 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1228 | remote = &tmpl->id.daddr; |
1229 | local = &tmpl->saddr; | |
76b3f055 | 1230 | family = tmpl->encap_family; |
a1e59abf PM |
1231 | if (xfrm_addr_any(local, family)) { |
1232 | error = xfrm_get_saddr(&tmp, remote, family); | |
1233 | if (error) | |
1234 | goto fail; | |
1235 | local = &tmp; | |
1236 | } | |
1da177e4 LT |
1237 | } |
1238 | ||
1239 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1240 | ||
1241 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1242 | xfrm[nx++] = x; | |
1243 | daddr = remote; | |
1244 | saddr = local; | |
1245 | continue; | |
1246 | } | |
1247 | if (x) { | |
1248 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1249 | -EINVAL : -EAGAIN); | |
1250 | xfrm_state_put(x); | |
1251 | } | |
a4322266 | 1252 | else if (error == -ESRCH) |
1253 | error = -EAGAIN; | |
1da177e4 LT |
1254 | |
1255 | if (!tmpl->optional) | |
1256 | goto fail; | |
1257 | } | |
1258 | return nx; | |
1259 | ||
1260 | fail: | |
1261 | for (nx--; nx>=0; nx--) | |
1262 | xfrm_state_put(xfrm[nx]); | |
1263 | return error; | |
1264 | } | |
1265 | ||
4e81bb83 MN |
1266 | static int |
1267 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1268 | struct xfrm_state **xfrm, | |
1269 | unsigned short family) | |
1270 | { | |
41a49cc3 MN |
1271 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1272 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1273 | int cnx = 0; |
1274 | int error; | |
1275 | int ret; | |
1276 | int i; | |
1277 | ||
1278 | for (i = 0; i < npols; i++) { | |
1279 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1280 | error = -ENOBUFS; | |
1281 | goto fail; | |
1282 | } | |
41a49cc3 MN |
1283 | |
1284 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1285 | if (ret < 0) { |
1286 | error = ret; | |
1287 | goto fail; | |
1288 | } else | |
1289 | cnx += ret; | |
1290 | } | |
1291 | ||
41a49cc3 MN |
1292 | /* found states are sorted for outbound processing */ |
1293 | if (npols > 1) | |
1294 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1295 | ||
4e81bb83 MN |
1296 | return cnx; |
1297 | ||
1298 | fail: | |
1299 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1300 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1301 | return error; |
1302 | ||
1303 | } | |
1304 | ||
1da177e4 LT |
1305 | /* Check that the bundle accepts the flow and its components are |
1306 | * still valid. | |
1307 | */ | |
1308 | ||
1309 | static struct dst_entry * | |
1310 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1311 | { | |
1312 | struct dst_entry *x; | |
1313 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1314 | if (unlikely(afinfo == NULL)) | |
1315 | return ERR_PTR(-EINVAL); | |
1316 | x = afinfo->find_bundle(fl, policy); | |
1317 | xfrm_policy_put_afinfo(afinfo); | |
1318 | return x; | |
1319 | } | |
1320 | ||
25ee3286 HX |
1321 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
1322 | { | |
1323 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1324 | int tos; | |
1da177e4 | 1325 | |
25ee3286 HX |
1326 | if (!afinfo) |
1327 | return -EINVAL; | |
1328 | ||
1329 | tos = afinfo->get_tos(fl); | |
1330 | ||
1331 | xfrm_policy_put_afinfo(afinfo); | |
1332 | ||
1333 | return tos; | |
1334 | } | |
1335 | ||
1336 | static inline struct xfrm_dst *xfrm_alloc_dst(int family) | |
1da177e4 | 1337 | { |
1da177e4 | 1338 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
25ee3286 HX |
1339 | struct xfrm_dst *xdst; |
1340 | ||
1341 | if (!afinfo) | |
1342 | return ERR_PTR(-EINVAL); | |
1343 | ||
1344 | xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS); | |
1345 | ||
1346 | xfrm_policy_put_afinfo(afinfo); | |
1347 | ||
1348 | return xdst; | |
1349 | } | |
1350 | ||
a1b05140 MN |
1351 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1352 | int nfheader_len) | |
1353 | { | |
1354 | struct xfrm_policy_afinfo *afinfo = | |
1355 | xfrm_policy_get_afinfo(dst->ops->family); | |
1356 | int err; | |
1357 | ||
1358 | if (!afinfo) | |
1359 | return -EINVAL; | |
1360 | ||
1361 | err = afinfo->init_path(path, dst, nfheader_len); | |
1362 | ||
1363 | xfrm_policy_put_afinfo(afinfo); | |
1364 | ||
1365 | return err; | |
1366 | } | |
1367 | ||
25ee3286 HX |
1368 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) |
1369 | { | |
1370 | struct xfrm_policy_afinfo *afinfo = | |
1371 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1372 | int err; | |
1373 | ||
1374 | if (!afinfo) | |
1da177e4 | 1375 | return -EINVAL; |
25ee3286 HX |
1376 | |
1377 | err = afinfo->fill_dst(xdst, dev); | |
1378 | ||
1da177e4 | 1379 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1380 | |
1da177e4 LT |
1381 | return err; |
1382 | } | |
1383 | ||
25ee3286 HX |
1384 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1385 | * all the metrics... Shortly, bundle a bundle. | |
1386 | */ | |
1387 | ||
1388 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1389 | struct xfrm_state **xfrm, int nx, | |
1390 | struct flowi *fl, | |
1391 | struct dst_entry *dst) | |
1392 | { | |
1393 | unsigned long now = jiffies; | |
1394 | struct net_device *dev; | |
1395 | struct dst_entry *dst_prev = NULL; | |
1396 | struct dst_entry *dst0 = NULL; | |
1397 | int i = 0; | |
1398 | int err; | |
1399 | int header_len = 0; | |
a1b05140 | 1400 | int nfheader_len = 0; |
25ee3286 HX |
1401 | int trailer_len = 0; |
1402 | int tos; | |
1403 | int family = policy->selector.family; | |
9bb182a7 YH |
1404 | xfrm_address_t saddr, daddr; |
1405 | ||
1406 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1407 | |
1408 | tos = xfrm_get_tos(fl, family); | |
1409 | err = tos; | |
1410 | if (tos < 0) | |
1411 | goto put_states; | |
1412 | ||
1413 | dst_hold(dst); | |
1414 | ||
1415 | for (; i < nx; i++) { | |
1416 | struct xfrm_dst *xdst = xfrm_alloc_dst(family); | |
1417 | struct dst_entry *dst1 = &xdst->u.dst; | |
1418 | ||
1419 | err = PTR_ERR(xdst); | |
1420 | if (IS_ERR(xdst)) { | |
1421 | dst_release(dst); | |
1422 | goto put_states; | |
1423 | } | |
1424 | ||
1425 | if (!dst_prev) | |
1426 | dst0 = dst1; | |
1427 | else { | |
1428 | dst_prev->child = dst_clone(dst1); | |
1429 | dst1->flags |= DST_NOHASH; | |
1430 | } | |
1431 | ||
1432 | xdst->route = dst; | |
1433 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); | |
1434 | ||
1435 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1436 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1437 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1438 | family); | |
25ee3286 HX |
1439 | err = PTR_ERR(dst); |
1440 | if (IS_ERR(dst)) | |
1441 | goto put_states; | |
1442 | } else | |
1443 | dst_hold(dst); | |
1444 | ||
1445 | dst1->xfrm = xfrm[i]; | |
1446 | xdst->genid = xfrm[i]->genid; | |
1447 | ||
1448 | dst1->obsolete = -1; | |
1449 | dst1->flags |= DST_HOST; | |
1450 | dst1->lastuse = now; | |
1451 | ||
1452 | dst1->input = dst_discard; | |
1453 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1454 | ||
1455 | dst1->next = dst_prev; | |
1456 | dst_prev = dst1; | |
1457 | ||
1458 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1459 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1460 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1461 | trailer_len += xfrm[i]->props.trailer_len; |
1462 | } | |
1463 | ||
1464 | dst_prev->child = dst; | |
1465 | dst0->path = dst; | |
1466 | ||
1467 | err = -ENODEV; | |
1468 | dev = dst->dev; | |
1469 | if (!dev) | |
1470 | goto free_dst; | |
1471 | ||
1472 | /* Copy neighbout for reachability confirmation */ | |
1473 | dst0->neighbour = neigh_clone(dst->neighbour); | |
1474 | ||
a1b05140 | 1475 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1476 | xfrm_init_pmtu(dst_prev); |
1477 | ||
1478 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1479 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1480 | ||
1481 | err = xfrm_fill_dst(xdst, dev); | |
1482 | if (err) | |
1483 | goto free_dst; | |
1484 | ||
1485 | dst_prev->header_len = header_len; | |
1486 | dst_prev->trailer_len = trailer_len; | |
1487 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1488 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1489 | } | |
1490 | ||
1491 | out: | |
1492 | return dst0; | |
1493 | ||
1494 | put_states: | |
1495 | for (; i < nx; i++) | |
1496 | xfrm_state_put(xfrm[i]); | |
1497 | free_dst: | |
1498 | if (dst0) | |
1499 | dst_free(dst0); | |
1500 | dst0 = ERR_PTR(err); | |
1501 | goto out; | |
1502 | } | |
1503 | ||
157bfc25 MN |
1504 | static int inline |
1505 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1506 | { | |
1507 | if (!*target) { | |
1508 | *target = kmalloc(size, GFP_ATOMIC); | |
1509 | if (!*target) | |
1510 | return -ENOMEM; | |
1511 | } | |
1512 | memcpy(*target, src, size); | |
1513 | return 0; | |
1514 | } | |
1515 | ||
1516 | static int inline | |
1517 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1518 | { | |
1519 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1520 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1521 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1522 | sel, sizeof(*sel)); | |
1523 | #else | |
1524 | return 0; | |
1525 | #endif | |
1526 | } | |
1527 | ||
1528 | static int inline | |
1529 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1530 | { | |
1531 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1532 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1533 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1534 | #else | |
1535 | return 0; | |
1536 | #endif | |
1537 | } | |
1da177e4 LT |
1538 | |
1539 | static int stale_bundle(struct dst_entry *dst); | |
1540 | ||
1541 | /* Main function: finds/creates a bundle for given flow. | |
1542 | * | |
1543 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1544 | * on interfaces with disabled IPsec. | |
1545 | */ | |
14e50e57 DM |
1546 | int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
1547 | struct sock *sk, int flags) | |
1da177e4 LT |
1548 | { |
1549 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1550 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1551 | int npols; | |
1552 | int pol_dead; | |
1553 | int xfrm_nr; | |
1554 | int pi; | |
1da177e4 LT |
1555 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1556 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1557 | int nx = 0; | |
1558 | int err; | |
1559 | u32 genid; | |
42cf93cd | 1560 | u16 family; |
df71837d | 1561 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1562 | |
1da177e4 LT |
1563 | restart: |
1564 | genid = atomic_read(&flow_cache_genid); | |
1565 | policy = NULL; | |
4e81bb83 MN |
1566 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1567 | pols[pi] = NULL; | |
1568 | npols = 0; | |
1569 | pol_dead = 0; | |
1570 | xfrm_nr = 0; | |
1571 | ||
f7944fb1 | 1572 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
e0d1caa7 | 1573 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
75b8c133 | 1574 | err = PTR_ERR(policy); |
0aa64774 MN |
1575 | if (IS_ERR(policy)) { |
1576 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); | |
75b8c133 | 1577 | goto dropdst; |
0aa64774 | 1578 | } |
3bccfbc7 | 1579 | } |
1da177e4 LT |
1580 | |
1581 | if (!policy) { | |
1582 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1583 | if ((dst_orig->flags & DST_NOXFRM) || |
1584 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
8b7817f3 | 1585 | goto nopol; |
1da177e4 | 1586 | |
e0d1caa7 | 1587 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1588 | dir, xfrm_policy_lookup); |
75b8c133 | 1589 | err = PTR_ERR(policy); |
d66e37a9 MN |
1590 | if (IS_ERR(policy)) { |
1591 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); | |
75b8c133 | 1592 | goto dropdst; |
d66e37a9 | 1593 | } |
1da177e4 LT |
1594 | } |
1595 | ||
1596 | if (!policy) | |
8b7817f3 | 1597 | goto nopol; |
1da177e4 | 1598 | |
42cf93cd | 1599 | family = dst_orig->ops->family; |
4e81bb83 MN |
1600 | pols[0] = policy; |
1601 | npols ++; | |
1602 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 | 1603 | |
aef21785 | 1604 | err = -ENOENT; |
8b7817f3 HX |
1605 | if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP)) |
1606 | goto error; | |
1607 | ||
1608 | policy->curlft.use_time = get_seconds(); | |
1609 | ||
1da177e4 | 1610 | switch (policy->action) { |
5e5234ff | 1611 | default: |
1da177e4 LT |
1612 | case XFRM_POLICY_BLOCK: |
1613 | /* Prohibit the flow */ | |
0aa64774 | 1614 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1615 | err = -EPERM; |
1616 | goto error; | |
1da177e4 LT |
1617 | |
1618 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1619 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1620 | if (policy->xfrm_nr == 0) { |
1621 | /* Flow passes not transformed. */ | |
1622 | xfrm_pol_put(policy); | |
1623 | return 0; | |
1624 | } | |
4e81bb83 | 1625 | #endif |
1da177e4 LT |
1626 | |
1627 | /* Try to find matching bundle. | |
1628 | * | |
1629 | * LATER: help from flow cache. It is optional, this | |
1630 | * is required only for output policy. | |
1631 | */ | |
1632 | dst = xfrm_find_bundle(fl, policy, family); | |
1633 | if (IS_ERR(dst)) { | |
0aa64774 | 1634 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
e104411b PM |
1635 | err = PTR_ERR(dst); |
1636 | goto error; | |
1da177e4 LT |
1637 | } |
1638 | ||
1639 | if (dst) | |
1640 | break; | |
1641 | ||
4e81bb83 MN |
1642 | #ifdef CONFIG_XFRM_SUB_POLICY |
1643 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1644 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1645 | fl, family, | |
1646 | XFRM_POLICY_OUT); | |
1647 | if (pols[1]) { | |
134b0fc5 | 1648 | if (IS_ERR(pols[1])) { |
0aa64774 | 1649 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); |
134b0fc5 JM |
1650 | err = PTR_ERR(pols[1]); |
1651 | goto error; | |
1652 | } | |
4e81bb83 | 1653 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
0aa64774 | 1654 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
4e81bb83 MN |
1655 | err = -EPERM; |
1656 | goto error; | |
1657 | } | |
1658 | npols ++; | |
1659 | xfrm_nr += pols[1]->xfrm_nr; | |
1660 | } | |
1661 | } | |
1662 | ||
1663 | /* | |
1664 | * Because neither flowi nor bundle information knows about | |
1665 | * transformation template size. On more than one policy usage | |
1666 | * we can realize whether all of them is bypass or not after | |
1667 | * they are searched. See above not-transformed bypass | |
1668 | * is surrounded by non-sub policy configuration, too. | |
1669 | */ | |
1670 | if (xfrm_nr == 0) { | |
1671 | /* Flow passes not transformed. */ | |
1672 | xfrm_pols_put(pols, npols); | |
1673 | return 0; | |
1674 | } | |
1675 | ||
1676 | #endif | |
1677 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1678 | |
1679 | if (unlikely(nx<0)) { | |
1680 | err = nx; | |
14e50e57 DM |
1681 | if (err == -EAGAIN && sysctl_xfrm_larval_drop) { |
1682 | /* EREMOTE tells the caller to generate | |
1683 | * a one-shot blackhole route. | |
1684 | */ | |
d66e37a9 | 1685 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
14e50e57 DM |
1686 | xfrm_pol_put(policy); |
1687 | return -EREMOTE; | |
1688 | } | |
815f4e57 | 1689 | if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) { |
1da177e4 LT |
1690 | DECLARE_WAITQUEUE(wait, current); |
1691 | ||
50a30657 | 1692 | add_wait_queue(&init_net.xfrm.km_waitq, &wait); |
1da177e4 LT |
1693 | set_current_state(TASK_INTERRUPTIBLE); |
1694 | schedule(); | |
1695 | set_current_state(TASK_RUNNING); | |
50a30657 | 1696 | remove_wait_queue(&init_net.xfrm.km_waitq, &wait); |
1da177e4 | 1697 | |
4e81bb83 | 1698 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1699 | |
1700 | if (nx == -EAGAIN && signal_pending(current)) { | |
0aa64774 | 1701 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 LT |
1702 | err = -ERESTART; |
1703 | goto error; | |
1704 | } | |
1705 | if (nx == -EAGAIN || | |
1706 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1707 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1708 | goto restart; |
1709 | } | |
1710 | err = nx; | |
1711 | } | |
0aa64774 MN |
1712 | if (err < 0) { |
1713 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); | |
1da177e4 | 1714 | goto error; |
0aa64774 | 1715 | } |
1da177e4 LT |
1716 | } |
1717 | if (nx == 0) { | |
1718 | /* Flow passes not transformed. */ | |
4e81bb83 | 1719 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1720 | return 0; |
1721 | } | |
1722 | ||
25ee3286 HX |
1723 | dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); |
1724 | err = PTR_ERR(dst); | |
0aa64774 MN |
1725 | if (IS_ERR(dst)) { |
1726 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1da177e4 | 1727 | goto error; |
0aa64774 | 1728 | } |
1da177e4 | 1729 | |
4e81bb83 MN |
1730 | for (pi = 0; pi < npols; pi++) { |
1731 | read_lock_bh(&pols[pi]->lock); | |
12a169e7 | 1732 | pol_dead |= pols[pi]->walk.dead; |
4e81bb83 MN |
1733 | read_unlock_bh(&pols[pi]->lock); |
1734 | } | |
1735 | ||
1da177e4 | 1736 | write_lock_bh(&policy->lock); |
4e81bb83 | 1737 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1738 | /* Wow! While we worked on resolving, this |
1739 | * policy has gone. Retry. It is not paranoia, | |
1740 | * we just cannot enlist new bundle to dead object. | |
1741 | * We can't enlist stable bundles either. | |
1742 | */ | |
1743 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1744 | dst_free(dst); |
00de651d | 1745 | |
0aa64774 MN |
1746 | if (pol_dead) |
1747 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD); | |
1748 | else | |
1749 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
00de651d HX |
1750 | err = -EHOSTUNREACH; |
1751 | goto error; | |
1da177e4 | 1752 | } |
157bfc25 MN |
1753 | |
1754 | if (npols > 1) | |
1755 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1756 | else | |
1757 | err = xfrm_dst_update_origin(dst, fl); | |
1758 | if (unlikely(err)) { | |
1759 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1760 | dst_free(dst); |
0aa64774 | 1761 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
157bfc25 MN |
1762 | goto error; |
1763 | } | |
1764 | ||
1da177e4 LT |
1765 | dst->next = policy->bundles; |
1766 | policy->bundles = dst; | |
1767 | dst_hold(dst); | |
1768 | write_unlock_bh(&policy->lock); | |
1769 | } | |
1770 | *dst_p = dst; | |
1771 | dst_release(dst_orig); | |
a716c119 | 1772 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1773 | return 0; |
1774 | ||
1775 | error: | |
4e81bb83 | 1776 | xfrm_pols_put(pols, npols); |
75b8c133 HX |
1777 | dropdst: |
1778 | dst_release(dst_orig); | |
1da177e4 LT |
1779 | *dst_p = NULL; |
1780 | return err; | |
8b7817f3 HX |
1781 | |
1782 | nopol: | |
aef21785 | 1783 | err = -ENOENT; |
8b7817f3 HX |
1784 | if (flags & XFRM_LOOKUP_ICMP) |
1785 | goto dropdst; | |
1786 | return 0; | |
1da177e4 | 1787 | } |
14e50e57 DM |
1788 | EXPORT_SYMBOL(__xfrm_lookup); |
1789 | ||
1790 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1791 | struct sock *sk, int flags) | |
1792 | { | |
1793 | int err = __xfrm_lookup(dst_p, fl, sk, flags); | |
1794 | ||
1795 | if (err == -EREMOTE) { | |
1796 | dst_release(*dst_p); | |
1797 | *dst_p = NULL; | |
1798 | err = -EAGAIN; | |
1799 | } | |
1800 | ||
1801 | return err; | |
1802 | } | |
1da177e4 LT |
1803 | EXPORT_SYMBOL(xfrm_lookup); |
1804 | ||
df0ba92a MN |
1805 | static inline int |
1806 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1807 | { | |
1808 | struct xfrm_state *x; | |
df0ba92a MN |
1809 | |
1810 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1811 | return 0; | |
1812 | x = skb->sp->xvec[idx]; | |
1813 | if (!x->type->reject) | |
1814 | return 0; | |
1ecafede | 1815 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1816 | } |
1817 | ||
1da177e4 LT |
1818 | /* When skb is transformed back to its "native" form, we have to |
1819 | * check policy restrictions. At the moment we make this in maximally | |
1820 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1821 | * have policy cached at them. | |
1822 | */ | |
1823 | ||
1824 | static inline int | |
a716c119 | 1825 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1826 | unsigned short family) |
1827 | { | |
1828 | if (xfrm_state_kern(x)) | |
928ba416 | 1829 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1830 | return x->id.proto == tmpl->id.proto && |
1831 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1832 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1833 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1834 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1835 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1836 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1837 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1838 | } |
1839 | ||
df0ba92a MN |
1840 | /* |
1841 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1842 | * because of optional transport mode, or next index of the mathced secpath | |
1843 | * state with the template. | |
1844 | * -1 is returned when no matching template is found. | |
1845 | * Otherwise "-2 - errored_index" is returned. | |
1846 | */ | |
1da177e4 LT |
1847 | static inline int |
1848 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1849 | unsigned short family) | |
1850 | { | |
1851 | int idx = start; | |
1852 | ||
1853 | if (tmpl->optional) { | |
7e49e6de | 1854 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1855 | return start; |
1856 | } else | |
1857 | start = -1; | |
1858 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1859 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1860 | return ++idx; |
df0ba92a MN |
1861 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1862 | if (start == -1) | |
1863 | start = -2-idx; | |
1da177e4 | 1864 | break; |
df0ba92a | 1865 | } |
1da177e4 LT |
1866 | } |
1867 | return start; | |
1868 | } | |
1869 | ||
d5422efe HX |
1870 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1871 | unsigned int family, int reverse) | |
1da177e4 LT |
1872 | { |
1873 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1874 | int err; |
1da177e4 LT |
1875 | |
1876 | if (unlikely(afinfo == NULL)) | |
1877 | return -EAFNOSUPPORT; | |
1878 | ||
d5422efe | 1879 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1880 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1881 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1882 | return err; |
1da177e4 | 1883 | } |
d5422efe | 1884 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1885 | |
df0ba92a | 1886 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1887 | { |
1888 | for (; k < sp->len; k++) { | |
df0ba92a | 1889 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1890 | *idxp = k; |
1da177e4 | 1891 | return 1; |
df0ba92a | 1892 | } |
1da177e4 LT |
1893 | } |
1894 | ||
1895 | return 0; | |
1896 | } | |
1897 | ||
a716c119 | 1898 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1899 | unsigned short family) |
1900 | { | |
1901 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1902 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1903 | int npols = 0; | |
1904 | int xfrm_nr; | |
1905 | int pi; | |
d5422efe | 1906 | int reverse; |
1da177e4 | 1907 | struct flowi fl; |
d5422efe | 1908 | u8 fl_dir; |
df0ba92a | 1909 | int xerr_idx = -1; |
1da177e4 | 1910 | |
d5422efe HX |
1911 | reverse = dir & ~XFRM_POLICY_MASK; |
1912 | dir &= XFRM_POLICY_MASK; | |
1913 | fl_dir = policy_to_flow_dir(dir); | |
1914 | ||
0aa64774 MN |
1915 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
1916 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 1917 | return 0; |
0aa64774 MN |
1918 | } |
1919 | ||
eb9c7ebe | 1920 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1921 | |
1922 | /* First, check used SA against their selectors. */ | |
1923 | if (skb->sp) { | |
1924 | int i; | |
1925 | ||
1926 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 1927 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 MN |
1928 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
1929 | XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH); | |
1da177e4 | 1930 | return 0; |
0aa64774 | 1931 | } |
1da177e4 LT |
1932 | } |
1933 | } | |
1934 | ||
1935 | pol = NULL; | |
3bccfbc7 | 1936 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1937 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 MN |
1938 | if (IS_ERR(pol)) { |
1939 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
3bccfbc7 | 1940 | return 0; |
0aa64774 | 1941 | } |
3bccfbc7 | 1942 | } |
1da177e4 LT |
1943 | |
1944 | if (!pol) | |
e0d1caa7 | 1945 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1946 | xfrm_policy_lookup); |
1947 | ||
0aa64774 MN |
1948 | if (IS_ERR(pol)) { |
1949 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1950 | return 0; |
0aa64774 | 1951 | } |
134b0fc5 | 1952 | |
df0ba92a | 1953 | if (!pol) { |
d1d9facf | 1954 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 1955 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
0aa64774 | 1956 | XFRM_INC_STATS(LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
1957 | return 0; |
1958 | } | |
1959 | return 1; | |
1960 | } | |
1da177e4 | 1961 | |
9d729f72 | 1962 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1963 | |
4e81bb83 MN |
1964 | pols[0] = pol; |
1965 | npols ++; | |
1966 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1967 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1968 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1969 | &fl, family, | |
1970 | XFRM_POLICY_IN); | |
1971 | if (pols[1]) { | |
0aa64774 MN |
1972 | if (IS_ERR(pols[1])) { |
1973 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1974 | return 0; |
0aa64774 | 1975 | } |
9d729f72 | 1976 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1977 | npols ++; |
1978 | } | |
1979 | } | |
1980 | #endif | |
1981 | ||
1da177e4 LT |
1982 | if (pol->action == XFRM_POLICY_ALLOW) { |
1983 | struct sec_path *sp; | |
1984 | static struct sec_path dummy; | |
4e81bb83 | 1985 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1986 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1987 | struct xfrm_tmpl **tpp = tp; |
1988 | int ti = 0; | |
1da177e4 LT |
1989 | int i, k; |
1990 | ||
1991 | if ((sp = skb->sp) == NULL) | |
1992 | sp = &dummy; | |
1993 | ||
4e81bb83 MN |
1994 | for (pi = 0; pi < npols; pi++) { |
1995 | if (pols[pi] != pol && | |
0aa64774 MN |
1996 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
1997 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); | |
4e81bb83 | 1998 | goto reject; |
0aa64774 MN |
1999 | } |
2000 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
2001 | XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR); | |
4e81bb83 | 2002 | goto reject_error; |
0aa64774 | 2003 | } |
4e81bb83 MN |
2004 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2005 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2006 | } | |
2007 | xfrm_nr = ti; | |
41a49cc3 MN |
2008 | if (npols > 1) { |
2009 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2010 | tpp = stp; | |
2011 | } | |
4e81bb83 | 2012 | |
1da177e4 LT |
2013 | /* For each tunnel xfrm, find the first matching tmpl. |
2014 | * For each tmpl before that, find corresponding xfrm. | |
2015 | * Order is _important_. Later we will implement | |
2016 | * some barriers, but at the moment barriers | |
2017 | * are implied between each two transformations. | |
2018 | */ | |
4e81bb83 MN |
2019 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2020 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2021 | if (k < 0) { |
d1d9facf JM |
2022 | if (k < -1) |
2023 | /* "-2 - errored_index" returned */ | |
2024 | xerr_idx = -(2+k); | |
0aa64774 | 2025 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2026 | goto reject; |
df0ba92a | 2027 | } |
1da177e4 LT |
2028 | } |
2029 | ||
0aa64774 MN |
2030 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
2031 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); | |
1da177e4 | 2032 | goto reject; |
0aa64774 | 2033 | } |
1da177e4 | 2034 | |
4e81bb83 | 2035 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2036 | return 1; |
2037 | } | |
0aa64774 | 2038 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2039 | |
2040 | reject: | |
df0ba92a | 2041 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2042 | reject_error: |
2043 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2044 | return 0; |
2045 | } | |
2046 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2047 | ||
2048 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2049 | { | |
2050 | struct flowi fl; | |
2051 | ||
0aa64774 MN |
2052 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
2053 | /* XXX: we should have something like FWDHDRERROR here. */ | |
2054 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 2055 | return 0; |
0aa64774 | 2056 | } |
1da177e4 LT |
2057 | |
2058 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
2059 | } | |
2060 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2061 | ||
d49c73c7 DM |
2062 | /* Optimize later using cookies and generation ids. */ |
2063 | ||
1da177e4 LT |
2064 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2065 | { | |
d49c73c7 DM |
2066 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
2067 | * to "-1" to force all XFRM destinations to get validated by | |
2068 | * dst_ops->check on every use. We do this because when a | |
2069 | * normal route referenced by an XFRM dst is obsoleted we do | |
2070 | * not go looking around for all parent referencing XFRM dsts | |
2071 | * so that we can invalidate them. It is just too much work. | |
2072 | * Instead we make the checks here on every use. For example: | |
2073 | * | |
2074 | * XFRM dst A --> IPv4 dst X | |
2075 | * | |
2076 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2077 | * in this example). If X is marked obsolete, "A" will not | |
2078 | * notice. That's what we are validating here via the | |
2079 | * stale_bundle() check. | |
2080 | * | |
2081 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2082 | * dst which causes it's ->obsolete field to be set to a | |
2083 | * positive non-zero integer. If an XFRM dst has been pruned | |
2084 | * like this, we want to force a new route lookup. | |
399c180a | 2085 | */ |
d49c73c7 DM |
2086 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2087 | return dst; | |
2088 | ||
1da177e4 LT |
2089 | return NULL; |
2090 | } | |
2091 | ||
2092 | static int stale_bundle(struct dst_entry *dst) | |
2093 | { | |
5b368e61 | 2094 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
2095 | } |
2096 | ||
aabc9761 | 2097 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2098 | { |
1da177e4 | 2099 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2100 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2101 | dev_hold(dst->dev); |
1da177e4 LT |
2102 | dev_put(dev); |
2103 | } | |
2104 | } | |
aabc9761 | 2105 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2106 | |
2107 | static void xfrm_link_failure(struct sk_buff *skb) | |
2108 | { | |
2109 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
2110 | return; | |
2111 | } | |
2112 | ||
2113 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2114 | { | |
2115 | if (dst) { | |
2116 | if (dst->obsolete) { | |
2117 | dst_release(dst); | |
2118 | dst = NULL; | |
2119 | } | |
2120 | } | |
2121 | return dst; | |
2122 | } | |
2123 | ||
2518c7c2 DM |
2124 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
2125 | { | |
2126 | struct dst_entry *dst, **dstp; | |
2127 | ||
2128 | write_lock(&pol->lock); | |
2129 | dstp = &pol->bundles; | |
2130 | while ((dst=*dstp) != NULL) { | |
2131 | if (func(dst)) { | |
2132 | *dstp = dst->next; | |
2133 | dst->next = *gc_list_p; | |
2134 | *gc_list_p = dst; | |
2135 | } else { | |
2136 | dstp = &dst->next; | |
2137 | } | |
2138 | } | |
2139 | write_unlock(&pol->lock); | |
2140 | } | |
2141 | ||
1da177e4 LT |
2142 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
2143 | { | |
2518c7c2 DM |
2144 | struct dst_entry *gc_list = NULL; |
2145 | int dir; | |
1da177e4 LT |
2146 | |
2147 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
2148 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
2149 | struct xfrm_policy *pol; | |
2150 | struct hlist_node *entry; | |
2151 | struct hlist_head *table; | |
2152 | int i; | |
4e81bb83 | 2153 | |
2518c7c2 DM |
2154 | hlist_for_each_entry(pol, entry, |
2155 | &xfrm_policy_inexact[dir], bydst) | |
2156 | prune_one_bundle(pol, func, &gc_list); | |
2157 | ||
2158 | table = xfrm_policy_bydst[dir].table; | |
2159 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
2160 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
2161 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
2162 | } |
2163 | } | |
2164 | read_unlock_bh(&xfrm_policy_lock); | |
2165 | ||
2166 | while (gc_list) { | |
2518c7c2 | 2167 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2168 | gc_list = dst->next; |
2169 | dst_free(dst); | |
2170 | } | |
2171 | } | |
2172 | ||
2173 | static int unused_bundle(struct dst_entry *dst) | |
2174 | { | |
2175 | return !atomic_read(&dst->__refcnt); | |
2176 | } | |
2177 | ||
2178 | static void __xfrm_garbage_collect(void) | |
2179 | { | |
2180 | xfrm_prune_bundles(unused_bundle); | |
2181 | } | |
2182 | ||
1c095399 | 2183 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
2184 | { |
2185 | xfrm_prune_bundles(stale_bundle); | |
2186 | return 0; | |
2187 | } | |
2188 | ||
25ee3286 | 2189 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2190 | { |
2191 | do { | |
2192 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2193 | u32 pmtu, route_mtu_cached; | |
2194 | ||
2195 | pmtu = dst_mtu(dst->child); | |
2196 | xdst->child_mtu_cached = pmtu; | |
2197 | ||
2198 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2199 | ||
2200 | route_mtu_cached = dst_mtu(xdst->route); | |
2201 | xdst->route_mtu_cached = route_mtu_cached; | |
2202 | ||
2203 | if (pmtu > route_mtu_cached) | |
2204 | pmtu = route_mtu_cached; | |
2205 | ||
2206 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2207 | } while ((dst = dst->next)); | |
2208 | } | |
2209 | ||
1da177e4 LT |
2210 | /* Check that the bundle accepts the flow and its components are |
2211 | * still valid. | |
2212 | */ | |
2213 | ||
5b368e61 VY |
2214 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2215 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2216 | { |
2217 | struct dst_entry *dst = &first->u.dst; | |
2218 | struct xfrm_dst *last; | |
2219 | u32 mtu; | |
2220 | ||
92d63dec | 2221 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2222 | (dst->dev && !netif_running(dst->dev))) |
2223 | return 0; | |
157bfc25 MN |
2224 | #ifdef CONFIG_XFRM_SUB_POLICY |
2225 | if (fl) { | |
2226 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2227 | return 0; | |
2228 | if (first->partner && | |
2229 | !xfrm_selector_match(first->partner, fl, family)) | |
2230 | return 0; | |
2231 | } | |
2232 | #endif | |
1da177e4 LT |
2233 | |
2234 | last = NULL; | |
2235 | ||
2236 | do { | |
2237 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2238 | ||
2239 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2240 | return 0; | |
67f83cbf VY |
2241 | if (fl && pol && |
2242 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2243 | return 0; |
1da177e4 LT |
2244 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2245 | return 0; | |
9d4a706d DM |
2246 | if (xdst->genid != dst->xfrm->genid) |
2247 | return 0; | |
e53820de | 2248 | |
1bfcb10f | 2249 | if (strict && fl && |
13996378 | 2250 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2251 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2252 | return 0; | |
1da177e4 LT |
2253 | |
2254 | mtu = dst_mtu(dst->child); | |
2255 | if (xdst->child_mtu_cached != mtu) { | |
2256 | last = xdst; | |
2257 | xdst->child_mtu_cached = mtu; | |
2258 | } | |
2259 | ||
92d63dec | 2260 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2261 | return 0; |
2262 | mtu = dst_mtu(xdst->route); | |
2263 | if (xdst->route_mtu_cached != mtu) { | |
2264 | last = xdst; | |
2265 | xdst->route_mtu_cached = mtu; | |
2266 | } | |
2267 | ||
2268 | dst = dst->child; | |
2269 | } while (dst->xfrm); | |
2270 | ||
2271 | if (likely(!last)) | |
2272 | return 1; | |
2273 | ||
2274 | mtu = last->child_mtu_cached; | |
2275 | for (;;) { | |
2276 | dst = &last->u.dst; | |
2277 | ||
2278 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2279 | if (mtu > last->route_mtu_cached) | |
2280 | mtu = last->route_mtu_cached; | |
2281 | dst->metrics[RTAX_MTU-1] = mtu; | |
2282 | ||
2283 | if (last == first) | |
2284 | break; | |
2285 | ||
bd0bf076 | 2286 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2287 | last->child_mtu_cached = mtu; |
2288 | } | |
2289 | ||
2290 | return 1; | |
2291 | } | |
2292 | ||
2293 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2294 | ||
1da177e4 LT |
2295 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2296 | { | |
2297 | int err = 0; | |
2298 | if (unlikely(afinfo == NULL)) | |
2299 | return -EINVAL; | |
2300 | if (unlikely(afinfo->family >= NPROTO)) | |
2301 | return -EAFNOSUPPORT; | |
e959d812 | 2302 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2303 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2304 | err = -ENOBUFS; | |
2305 | else { | |
2306 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2307 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2308 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2309 | if (likely(dst_ops->check == NULL)) | |
2310 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2311 | if (likely(dst_ops->negative_advice == NULL)) |
2312 | dst_ops->negative_advice = xfrm_negative_advice; | |
2313 | if (likely(dst_ops->link_failure == NULL)) | |
2314 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2315 | if (likely(afinfo->garbage_collect == NULL)) |
2316 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2317 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2318 | } | |
e959d812 | 2319 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2320 | return err; |
2321 | } | |
2322 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2323 | ||
2324 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2325 | { | |
2326 | int err = 0; | |
2327 | if (unlikely(afinfo == NULL)) | |
2328 | return -EINVAL; | |
2329 | if (unlikely(afinfo->family >= NPROTO)) | |
2330 | return -EAFNOSUPPORT; | |
e959d812 | 2331 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2332 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2333 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2334 | err = -EINVAL; | |
2335 | else { | |
2336 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2337 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2338 | dst_ops->kmem_cachep = NULL; | |
2339 | dst_ops->check = NULL; | |
1da177e4 LT |
2340 | dst_ops->negative_advice = NULL; |
2341 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2342 | afinfo->garbage_collect = NULL; |
2343 | } | |
2344 | } | |
e959d812 | 2345 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2346 | return err; |
2347 | } | |
2348 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2349 | ||
2350 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2351 | { | |
2352 | struct xfrm_policy_afinfo *afinfo; | |
2353 | if (unlikely(family >= NPROTO)) | |
2354 | return NULL; | |
2355 | read_lock(&xfrm_policy_afinfo_lock); | |
2356 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2357 | if (unlikely(!afinfo)) |
2358 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2359 | return afinfo; |
2360 | } | |
2361 | ||
2362 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2363 | { | |
546be240 HX |
2364 | read_unlock(&xfrm_policy_afinfo_lock); |
2365 | } | |
2366 | ||
1da177e4 LT |
2367 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2368 | { | |
e9dc8653 EB |
2369 | struct net_device *dev = ptr; |
2370 | ||
721499e8 | 2371 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
2372 | return NOTIFY_DONE; |
2373 | ||
1da177e4 LT |
2374 | switch (event) { |
2375 | case NETDEV_DOWN: | |
2376 | xfrm_flush_bundles(); | |
2377 | } | |
2378 | return NOTIFY_DONE; | |
2379 | } | |
2380 | ||
2381 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2382 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2383 | }; |
2384 | ||
558f82ef MN |
2385 | #ifdef CONFIG_XFRM_STATISTICS |
2386 | static int __init xfrm_statistics_init(void) | |
2387 | { | |
2388 | if (snmp_mib_init((void **)xfrm_statistics, | |
2389 | sizeof(struct linux_xfrm_mib)) < 0) | |
2390 | return -ENOMEM; | |
2391 | return 0; | |
2392 | } | |
2393 | #endif | |
2394 | ||
d62ddc21 | 2395 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2396 | { |
2518c7c2 DM |
2397 | unsigned int hmask, sz; |
2398 | int dir; | |
2399 | ||
d62ddc21 AD |
2400 | if (net_eq(net, &init_net)) |
2401 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2402 | sizeof(struct xfrm_dst), |
e5d679f3 | 2403 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2404 | NULL); |
1da177e4 | 2405 | |
2518c7c2 DM |
2406 | hmask = 8 - 1; |
2407 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2408 | ||
93b851c1 AD |
2409 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2410 | if (!net->xfrm.policy_byidx) | |
2411 | goto out_byidx; | |
8100bea7 | 2412 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 DM |
2413 | |
2414 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2415 | struct xfrm_policy_hash *htab; | |
2416 | ||
2417 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); | |
2418 | ||
2419 | htab = &xfrm_policy_bydst[dir]; | |
44e36b42 | 2420 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2421 | htab->hmask = hmask; |
2422 | if (!htab->table) | |
2423 | panic("XFRM: failed to allocate bydst hash\n"); | |
2424 | } | |
2425 | ||
adfcf0b2 | 2426 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
d62ddc21 AD |
2427 | if (net_eq(net, &init_net)) |
2428 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2429 | return 0; | |
93b851c1 AD |
2430 | |
2431 | out_byidx: | |
2432 | return -ENOMEM; | |
d62ddc21 AD |
2433 | } |
2434 | ||
2435 | static void xfrm_policy_fini(struct net *net) | |
2436 | { | |
93b851c1 AD |
2437 | unsigned int sz; |
2438 | ||
adfcf0b2 | 2439 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2440 | |
8100bea7 | 2441 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2442 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2443 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2444 | } |
2445 | ||
d62ddc21 AD |
2446 | static int __net_init xfrm_net_init(struct net *net) |
2447 | { | |
2448 | int rv; | |
2449 | ||
2450 | rv = xfrm_state_init(net); | |
2451 | if (rv < 0) | |
2452 | goto out_state; | |
2453 | rv = xfrm_policy_init(net); | |
2454 | if (rv < 0) | |
2455 | goto out_policy; | |
2456 | return 0; | |
2457 | ||
2458 | out_policy: | |
2459 | xfrm_state_fini(net); | |
2460 | out_state: | |
2461 | return rv; | |
2462 | } | |
2463 | ||
2464 | static void __net_exit xfrm_net_exit(struct net *net) | |
2465 | { | |
2466 | xfrm_policy_fini(net); | |
2467 | xfrm_state_fini(net); | |
2468 | } | |
2469 | ||
2470 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2471 | .init = xfrm_net_init, | |
2472 | .exit = xfrm_net_exit, | |
2473 | }; | |
2474 | ||
1da177e4 LT |
2475 | void __init xfrm_init(void) |
2476 | { | |
d62ddc21 | 2477 | register_pernet_subsys(&xfrm_net_ops); |
558f82ef MN |
2478 | #ifdef CONFIG_XFRM_STATISTICS |
2479 | xfrm_statistics_init(); | |
2480 | #endif | |
1da177e4 | 2481 | xfrm_input_init(); |
558f82ef MN |
2482 | #ifdef CONFIG_XFRM_STATISTICS |
2483 | xfrm_proc_init(); | |
2484 | #endif | |
1da177e4 LT |
2485 | } |
2486 | ||
ab5f5e8b | 2487 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2488 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2489 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2490 | { |
875179fa PM |
2491 | struct xfrm_sec_ctx *ctx = xp->security; |
2492 | struct xfrm_selector *sel = &xp->selector; | |
2493 | ||
2494 | if (ctx) | |
ab5f5e8b | 2495 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2496 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2497 | |
875179fa | 2498 | switch(sel->family) { |
ab5f5e8b | 2499 | case AF_INET: |
21454aaa | 2500 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2501 | if (sel->prefixlen_s != 32) |
2502 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2503 | sel->prefixlen_s); | |
21454aaa | 2504 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2505 | if (sel->prefixlen_d != 32) |
2506 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2507 | sel->prefixlen_d); | |
ab5f5e8b JL |
2508 | break; |
2509 | case AF_INET6: | |
5b095d98 | 2510 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2511 | if (sel->prefixlen_s != 128) |
2512 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2513 | sel->prefixlen_s); | |
5b095d98 | 2514 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2515 | if (sel->prefixlen_d != 128) |
2516 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2517 | sel->prefixlen_d); | |
ab5f5e8b JL |
2518 | break; |
2519 | } | |
2520 | } | |
2521 | ||
68277acc | 2522 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2532386f | 2523 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2524 | { |
2525 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2526 | |
afeb14b4 | 2527 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2528 | if (audit_buf == NULL) |
2529 | return; | |
2532386f | 2530 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2531 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2532 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2533 | audit_log_end(audit_buf); | |
2534 | } | |
2535 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2536 | ||
68277acc | 2537 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2532386f | 2538 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2539 | { |
2540 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2541 | |
afeb14b4 | 2542 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2543 | if (audit_buf == NULL) |
2544 | return; | |
2532386f | 2545 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2546 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2547 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2548 | audit_log_end(audit_buf); | |
2549 | } | |
2550 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2551 | #endif | |
2552 | ||
80c9abaa SS |
2553 | #ifdef CONFIG_XFRM_MIGRATE |
2554 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2555 | struct xfrm_selector *sel_tgt) | |
2556 | { | |
2557 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2558 | if (sel_tgt->family == sel_cmp->family && | |
2559 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2560 | sel_cmp->family) == 0 && |
80c9abaa SS |
2561 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2562 | sel_cmp->family) == 0 && | |
2563 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2564 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2565 | return 1; | |
2566 | } | |
2567 | } else { | |
2568 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2569 | return 1; | |
2570 | } | |
2571 | } | |
2572 | return 0; | |
2573 | } | |
2574 | ||
2575 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2576 | u8 dir, u8 type) | |
2577 | { | |
2578 | struct xfrm_policy *pol, *ret = NULL; | |
2579 | struct hlist_node *entry; | |
2580 | struct hlist_head *chain; | |
2581 | u32 priority = ~0U; | |
2582 | ||
2583 | read_lock_bh(&xfrm_policy_lock); | |
2584 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); | |
2585 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2586 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2587 | pol->type == type) { | |
2588 | ret = pol; | |
2589 | priority = ret->priority; | |
2590 | break; | |
2591 | } | |
2592 | } | |
2593 | chain = &xfrm_policy_inexact[dir]; | |
2594 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2595 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2596 | pol->type == type && | |
2597 | pol->priority < priority) { | |
2598 | ret = pol; | |
2599 | break; | |
2600 | } | |
2601 | } | |
2602 | ||
2603 | if (ret) | |
2604 | xfrm_pol_hold(ret); | |
2605 | ||
2606 | read_unlock_bh(&xfrm_policy_lock); | |
2607 | ||
2608 | return ret; | |
2609 | } | |
2610 | ||
2611 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2612 | { | |
2613 | int match = 0; | |
2614 | ||
2615 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2616 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2617 | switch (t->mode) { | |
2618 | case XFRM_MODE_TUNNEL: | |
2619 | case XFRM_MODE_BEET: | |
2620 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2621 | m->old_family) == 0 && | |
2622 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2623 | m->old_family) == 0) { | |
2624 | match = 1; | |
2625 | } | |
2626 | break; | |
2627 | case XFRM_MODE_TRANSPORT: | |
2628 | /* in case of transport mode, template does not store | |
2629 | any IP addresses, hence we just compare mode and | |
2630 | protocol */ | |
2631 | match = 1; | |
2632 | break; | |
2633 | default: | |
2634 | break; | |
2635 | } | |
2636 | } | |
2637 | return match; | |
2638 | } | |
2639 | ||
2640 | /* update endpoint address(es) of template(s) */ | |
2641 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2642 | struct xfrm_migrate *m, int num_migrate) | |
2643 | { | |
2644 | struct xfrm_migrate *mp; | |
2645 | struct dst_entry *dst; | |
2646 | int i, j, n = 0; | |
2647 | ||
2648 | write_lock_bh(&pol->lock); | |
12a169e7 | 2649 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
2650 | /* target policy has been deleted */ |
2651 | write_unlock_bh(&pol->lock); | |
2652 | return -ENOENT; | |
2653 | } | |
2654 | ||
2655 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2656 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2657 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2658 | continue; | |
2659 | n++; | |
1bfcb10f HX |
2660 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2661 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2662 | continue; |
2663 | /* update endpoints */ | |
2664 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2665 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2666 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2667 | sizeof(pol->xfrm_vec[i].saddr)); | |
2668 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2669 | /* flush bundles */ | |
2670 | while ((dst = pol->bundles) != NULL) { | |
2671 | pol->bundles = dst->next; | |
2672 | dst_free(dst); | |
2673 | } | |
2674 | } | |
2675 | } | |
2676 | ||
2677 | write_unlock_bh(&pol->lock); | |
2678 | ||
2679 | if (!n) | |
2680 | return -ENODATA; | |
2681 | ||
2682 | return 0; | |
2683 | } | |
2684 | ||
2685 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2686 | { | |
2687 | int i, j; | |
2688 | ||
2689 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2690 | return -EINVAL; | |
2691 | ||
2692 | for (i = 0; i < num_migrate; i++) { | |
2693 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2694 | m[i].old_family) == 0) && | |
2695 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2696 | m[i].old_family) == 0)) | |
2697 | return -EINVAL; | |
2698 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2699 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2700 | return -EINVAL; | |
2701 | ||
2702 | /* check if there is any duplicated entry */ | |
2703 | for (j = i + 1; j < num_migrate; j++) { | |
2704 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2705 | sizeof(m[i].old_daddr)) && | |
2706 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2707 | sizeof(m[i].old_saddr)) && | |
2708 | m[i].proto == m[j].proto && | |
2709 | m[i].mode == m[j].mode && | |
2710 | m[i].reqid == m[j].reqid && | |
2711 | m[i].old_family == m[j].old_family) | |
2712 | return -EINVAL; | |
2713 | } | |
2714 | } | |
2715 | ||
2716 | return 0; | |
2717 | } | |
2718 | ||
2719 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
13c1d189 AE |
2720 | struct xfrm_migrate *m, int num_migrate, |
2721 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
2722 | { |
2723 | int i, err, nx_cur = 0, nx_new = 0; | |
2724 | struct xfrm_policy *pol = NULL; | |
2725 | struct xfrm_state *x, *xc; | |
2726 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2727 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2728 | struct xfrm_migrate *mp; | |
2729 | ||
2730 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2731 | goto out; | |
2732 | ||
2733 | /* Stage 1 - find policy */ | |
2734 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2735 | err = -ENOENT; | |
2736 | goto out; | |
2737 | } | |
2738 | ||
2739 | /* Stage 2 - find and update state(s) */ | |
2740 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2741 | if ((x = xfrm_migrate_state_find(mp))) { | |
2742 | x_cur[nx_cur] = x; | |
2743 | nx_cur++; | |
2744 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2745 | x_new[nx_new] = xc; | |
2746 | nx_new++; | |
2747 | } else { | |
2748 | err = -ENODATA; | |
2749 | goto restore_state; | |
2750 | } | |
2751 | } | |
2752 | } | |
2753 | ||
2754 | /* Stage 3 - update policy */ | |
2755 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2756 | goto restore_state; | |
2757 | ||
2758 | /* Stage 4 - delete old state(s) */ | |
2759 | if (nx_cur) { | |
2760 | xfrm_states_put(x_cur, nx_cur); | |
2761 | xfrm_states_delete(x_cur, nx_cur); | |
2762 | } | |
2763 | ||
2764 | /* Stage 5 - announce */ | |
13c1d189 | 2765 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
2766 | |
2767 | xfrm_pol_put(pol); | |
2768 | ||
2769 | return 0; | |
2770 | out: | |
2771 | return err; | |
2772 | ||
2773 | restore_state: | |
2774 | if (pol) | |
2775 | xfrm_pol_put(pol); | |
2776 | if (nx_cur) | |
2777 | xfrm_states_put(x_cur, nx_cur); | |
2778 | if (nx_new) | |
2779 | xfrm_states_delete(x_new, nx_new); | |
2780 | ||
2781 | return err; | |
2782 | } | |
e610e679 | 2783 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2784 | #endif |