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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> |
25ee3286 | 27 | #include <net/dst.h> |
1da177e4 LT |
28 | #include <net/xfrm.h> |
29 | #include <net/ip.h> | |
558f82ef MN |
30 | #ifdef CONFIG_XFRM_STATISTICS |
31 | #include <net/snmp.h> | |
32 | #endif | |
1da177e4 | 33 | |
44e36b42 DM |
34 | #include "xfrm_hash.h" |
35 | ||
aad0e0b9 | 36 | int sysctl_xfrm_larval_drop __read_mostly; |
14e50e57 | 37 | |
558f82ef MN |
38 | #ifdef CONFIG_XFRM_STATISTICS |
39 | DEFINE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics) __read_mostly; | |
40 | EXPORT_SYMBOL(xfrm_statistics); | |
41 | #endif | |
42 | ||
4a3e2f71 AV |
43 | DEFINE_MUTEX(xfrm_cfg_mutex); |
44 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
1da177e4 LT |
45 | |
46 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
47 | ||
2518c7c2 DM |
48 | unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
49 | EXPORT_SYMBOL(xfrm_policy_count); | |
1da177e4 LT |
50 | |
51 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); | |
52 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
53 | ||
e18b890b | 54 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 LT |
55 | |
56 | static struct work_struct xfrm_policy_gc_work; | |
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 | ||
25ee3286 HX |
98 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
99 | int family) | |
1da177e4 | 100 | { |
66cdb3ca HX |
101 | xfrm_address_t *saddr = &x->props.saddr; |
102 | xfrm_address_t *daddr = &x->id.daddr; | |
103 | struct xfrm_policy_afinfo *afinfo; | |
104 | struct dst_entry *dst; | |
105 | ||
106 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) | |
107 | saddr = x->coaddr; | |
108 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) | |
109 | daddr = x->coaddr; | |
1da177e4 | 110 | |
25ee3286 | 111 | afinfo = xfrm_policy_get_afinfo(family); |
1da177e4 | 112 | if (unlikely(afinfo == NULL)) |
66cdb3ca | 113 | return ERR_PTR(-EAFNOSUPPORT); |
1da177e4 | 114 | |
66cdb3ca | 115 | dst = afinfo->dst_lookup(tos, saddr, daddr); |
1da177e4 | 116 | xfrm_policy_put_afinfo(afinfo); |
66cdb3ca | 117 | return dst; |
1da177e4 | 118 | } |
1da177e4 | 119 | |
1da177e4 LT |
120 | static inline unsigned long make_jiffies(long secs) |
121 | { | |
122 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
123 | return MAX_SCHEDULE_TIMEOUT-1; | |
124 | else | |
a716c119 | 125 | return secs*HZ; |
1da177e4 LT |
126 | } |
127 | ||
128 | static void xfrm_policy_timer(unsigned long data) | |
129 | { | |
130 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 131 | unsigned long now = get_seconds(); |
1da177e4 LT |
132 | long next = LONG_MAX; |
133 | int warn = 0; | |
134 | int dir; | |
135 | ||
136 | read_lock(&xp->lock); | |
137 | ||
138 | if (xp->dead) | |
139 | goto out; | |
140 | ||
77d8d7a6 | 141 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
142 | |
143 | if (xp->lft.hard_add_expires_seconds) { | |
144 | long tmo = xp->lft.hard_add_expires_seconds + | |
145 | xp->curlft.add_time - now; | |
146 | if (tmo <= 0) | |
147 | goto expired; | |
148 | if (tmo < next) | |
149 | next = tmo; | |
150 | } | |
151 | if (xp->lft.hard_use_expires_seconds) { | |
152 | long tmo = xp->lft.hard_use_expires_seconds + | |
153 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
154 | if (tmo <= 0) | |
155 | goto expired; | |
156 | if (tmo < next) | |
157 | next = tmo; | |
158 | } | |
159 | if (xp->lft.soft_add_expires_seconds) { | |
160 | long tmo = xp->lft.soft_add_expires_seconds + | |
161 | xp->curlft.add_time - now; | |
162 | if (tmo <= 0) { | |
163 | warn = 1; | |
164 | tmo = XFRM_KM_TIMEOUT; | |
165 | } | |
166 | if (tmo < next) | |
167 | next = tmo; | |
168 | } | |
169 | if (xp->lft.soft_use_expires_seconds) { | |
170 | long tmo = xp->lft.soft_use_expires_seconds + | |
171 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
172 | if (tmo <= 0) { | |
173 | warn = 1; | |
174 | tmo = XFRM_KM_TIMEOUT; | |
175 | } | |
176 | if (tmo < next) | |
177 | next = tmo; | |
178 | } | |
179 | ||
180 | if (warn) | |
6c5c8ca7 | 181 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
182 | if (next != LONG_MAX && |
183 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
184 | xfrm_pol_hold(xp); | |
185 | ||
186 | out: | |
187 | read_unlock(&xp->lock); | |
188 | xfrm_pol_put(xp); | |
189 | return; | |
190 | ||
191 | expired: | |
192 | read_unlock(&xp->lock); | |
4666faab | 193 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 194 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
195 | xfrm_pol_put(xp); |
196 | } | |
197 | ||
198 | ||
199 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
200 | * SPD calls. | |
201 | */ | |
202 | ||
dd0fc66f | 203 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp) |
1da177e4 LT |
204 | { |
205 | struct xfrm_policy *policy; | |
206 | ||
0da974f4 | 207 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
208 | |
209 | if (policy) { | |
2518c7c2 DM |
210 | INIT_HLIST_NODE(&policy->bydst); |
211 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 212 | rwlock_init(&policy->lock); |
2518c7c2 | 213 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
214 | setup_timer(&policy->timer, xfrm_policy_timer, |
215 | (unsigned long)policy); | |
1da177e4 LT |
216 | } |
217 | return policy; | |
218 | } | |
219 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
220 | ||
221 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
222 | ||
223 | void __xfrm_policy_destroy(struct xfrm_policy *policy) | |
224 | { | |
09a62660 | 225 | BUG_ON(!policy->dead); |
1da177e4 | 226 | |
09a62660 | 227 | BUG_ON(policy->bundles); |
1da177e4 LT |
228 | |
229 | if (del_timer(&policy->timer)) | |
230 | BUG(); | |
231 | ||
df71837d | 232 | security_xfrm_policy_free(policy); |
1da177e4 LT |
233 | kfree(policy); |
234 | } | |
235 | EXPORT_SYMBOL(__xfrm_policy_destroy); | |
236 | ||
237 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
238 | { | |
239 | struct dst_entry *dst; | |
240 | ||
241 | while ((dst = policy->bundles) != NULL) { | |
242 | policy->bundles = dst->next; | |
243 | dst_free(dst); | |
244 | } | |
245 | ||
246 | if (del_timer(&policy->timer)) | |
247 | atomic_dec(&policy->refcnt); | |
248 | ||
249 | if (atomic_read(&policy->refcnt) > 1) | |
250 | flow_cache_flush(); | |
251 | ||
252 | xfrm_pol_put(policy); | |
253 | } | |
254 | ||
c4028958 | 255 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
256 | { |
257 | struct xfrm_policy *policy; | |
2518c7c2 DM |
258 | struct hlist_node *entry, *tmp; |
259 | struct hlist_head gc_list; | |
1da177e4 LT |
260 | |
261 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
262 | gc_list.first = xfrm_policy_gc_list.first; |
263 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
264 | spin_unlock_bh(&xfrm_policy_gc_lock); |
265 | ||
2518c7c2 | 266 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 267 | xfrm_policy_gc_kill(policy); |
1da177e4 LT |
268 | } |
269 | ||
270 | /* Rule must be locked. Release descentant resources, announce | |
271 | * entry dead. The rule must be unlinked from lists to the moment. | |
272 | */ | |
273 | ||
274 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
275 | { | |
276 | int dead; | |
277 | ||
278 | write_lock_bh(&policy->lock); | |
279 | dead = policy->dead; | |
280 | policy->dead = 1; | |
281 | write_unlock_bh(&policy->lock); | |
282 | ||
283 | if (unlikely(dead)) { | |
284 | WARN_ON(1); | |
285 | return; | |
286 | } | |
287 | ||
288 | spin_lock(&xfrm_policy_gc_lock); | |
2518c7c2 | 289 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
1da177e4 LT |
290 | spin_unlock(&xfrm_policy_gc_lock); |
291 | ||
292 | schedule_work(&xfrm_policy_gc_work); | |
293 | } | |
294 | ||
2518c7c2 DM |
295 | struct xfrm_policy_hash { |
296 | struct hlist_head *table; | |
297 | unsigned int hmask; | |
298 | }; | |
299 | ||
300 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; | |
301 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; | |
302 | static struct hlist_head *xfrm_policy_byidx __read_mostly; | |
303 | static unsigned int xfrm_idx_hmask __read_mostly; | |
304 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; | |
305 | ||
2518c7c2 DM |
306 | static inline unsigned int idx_hash(u32 index) |
307 | { | |
308 | return __idx_hash(index, xfrm_idx_hmask); | |
309 | } | |
310 | ||
2518c7c2 DM |
311 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
312 | { | |
313 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
314 | unsigned int hash = __sel_hash(sel, family, hmask); | |
315 | ||
316 | return (hash == hmask + 1 ? | |
317 | &xfrm_policy_inexact[dir] : | |
318 | xfrm_policy_bydst[dir].table + hash); | |
319 | } | |
320 | ||
321 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) | |
322 | { | |
323 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
324 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); | |
325 | ||
326 | return xfrm_policy_bydst[dir].table + hash; | |
327 | } | |
328 | ||
2518c7c2 DM |
329 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
330 | struct hlist_head *ndsttable, | |
331 | unsigned int nhashmask) | |
332 | { | |
333 | struct hlist_node *entry, *tmp; | |
334 | struct xfrm_policy *pol; | |
335 | ||
336 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { | |
337 | unsigned int h; | |
338 | ||
339 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
340 | pol->family, nhashmask); | |
341 | hlist_add_head(&pol->bydst, ndsttable+h); | |
342 | } | |
343 | } | |
344 | ||
345 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
346 | struct hlist_head *nidxtable, | |
347 | unsigned int nhashmask) | |
348 | { | |
349 | struct hlist_node *entry, *tmp; | |
350 | struct xfrm_policy *pol; | |
351 | ||
352 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
353 | unsigned int h; | |
354 | ||
355 | h = __idx_hash(pol->index, nhashmask); | |
356 | hlist_add_head(&pol->byidx, nidxtable+h); | |
357 | } | |
358 | } | |
359 | ||
360 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
361 | { | |
362 | return ((old_hmask + 1) << 1) - 1; | |
363 | } | |
364 | ||
365 | static void xfrm_bydst_resize(int dir) | |
366 | { | |
367 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
368 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
369 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
370 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; | |
44e36b42 | 371 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
372 | int i; |
373 | ||
374 | if (!ndst) | |
375 | return; | |
376 | ||
377 | write_lock_bh(&xfrm_policy_lock); | |
378 | ||
379 | for (i = hmask; i >= 0; i--) | |
380 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
381 | ||
382 | xfrm_policy_bydst[dir].table = ndst; | |
383 | xfrm_policy_bydst[dir].hmask = nhashmask; | |
384 | ||
385 | write_unlock_bh(&xfrm_policy_lock); | |
386 | ||
44e36b42 | 387 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
388 | } |
389 | ||
390 | static void xfrm_byidx_resize(int total) | |
391 | { | |
392 | unsigned int hmask = xfrm_idx_hmask; | |
393 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
394 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
395 | struct hlist_head *oidx = xfrm_policy_byidx; | |
44e36b42 | 396 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
397 | int i; |
398 | ||
399 | if (!nidx) | |
400 | return; | |
401 | ||
402 | write_lock_bh(&xfrm_policy_lock); | |
403 | ||
404 | for (i = hmask; i >= 0; i--) | |
405 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
406 | ||
407 | xfrm_policy_byidx = nidx; | |
408 | xfrm_idx_hmask = nhashmask; | |
409 | ||
410 | write_unlock_bh(&xfrm_policy_lock); | |
411 | ||
44e36b42 | 412 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
413 | } |
414 | ||
415 | static inline int xfrm_bydst_should_resize(int dir, int *total) | |
416 | { | |
417 | unsigned int cnt = xfrm_policy_count[dir]; | |
418 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
419 | ||
420 | if (total) | |
421 | *total += cnt; | |
422 | ||
423 | if ((hmask + 1) < xfrm_policy_hashmax && | |
424 | cnt > hmask) | |
425 | return 1; | |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
430 | static inline int xfrm_byidx_should_resize(int total) | |
431 | { | |
432 | unsigned int hmask = xfrm_idx_hmask; | |
433 | ||
434 | if ((hmask + 1) < xfrm_policy_hashmax && | |
435 | total > hmask) | |
436 | return 1; | |
437 | ||
438 | return 0; | |
439 | } | |
440 | ||
5a6d3416 | 441 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
442 | { |
443 | read_lock_bh(&xfrm_policy_lock); | |
444 | si->incnt = xfrm_policy_count[XFRM_POLICY_IN]; | |
445 | si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT]; | |
446 | si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD]; | |
447 | si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
448 | si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
449 | si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
450 | si->spdhcnt = xfrm_idx_hmask; | |
451 | si->spdhmcnt = xfrm_policy_hashmax; | |
452 | read_unlock_bh(&xfrm_policy_lock); | |
453 | } | |
454 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 455 | |
ecfd6b18 | 456 | static DEFINE_MUTEX(hash_resize_mutex); |
c4028958 | 457 | static void xfrm_hash_resize(struct work_struct *__unused) |
2518c7c2 DM |
458 | { |
459 | int dir, total; | |
460 | ||
461 | mutex_lock(&hash_resize_mutex); | |
462 | ||
463 | total = 0; | |
464 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
465 | if (xfrm_bydst_should_resize(dir, &total)) | |
466 | xfrm_bydst_resize(dir); | |
467 | } | |
468 | if (xfrm_byidx_should_resize(total)) | |
469 | xfrm_byidx_resize(total); | |
470 | ||
471 | mutex_unlock(&hash_resize_mutex); | |
472 | } | |
473 | ||
c4028958 | 474 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
2518c7c2 | 475 | |
1da177e4 LT |
476 | /* Generate new index... KAME seems to generate them ordered by cost |
477 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
4e81bb83 | 478 | static u32 xfrm_gen_index(u8 type, int dir) |
1da177e4 | 479 | { |
1da177e4 LT |
480 | static u32 idx_generator; |
481 | ||
482 | for (;;) { | |
2518c7c2 DM |
483 | struct hlist_node *entry; |
484 | struct hlist_head *list; | |
485 | struct xfrm_policy *p; | |
486 | u32 idx; | |
487 | int found; | |
488 | ||
1da177e4 LT |
489 | idx = (idx_generator | dir); |
490 | idx_generator += 8; | |
491 | if (idx == 0) | |
492 | idx = 8; | |
2518c7c2 DM |
493 | list = xfrm_policy_byidx + idx_hash(idx); |
494 | found = 0; | |
495 | hlist_for_each_entry(p, entry, list, byidx) { | |
496 | if (p->index == idx) { | |
497 | found = 1; | |
1da177e4 | 498 | break; |
2518c7c2 | 499 | } |
1da177e4 | 500 | } |
2518c7c2 | 501 | if (!found) |
1da177e4 LT |
502 | return idx; |
503 | } | |
504 | } | |
505 | ||
2518c7c2 DM |
506 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
507 | { | |
508 | u32 *p1 = (u32 *) s1; | |
509 | u32 *p2 = (u32 *) s2; | |
510 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
511 | int i; | |
512 | ||
513 | for (i = 0; i < len; i++) { | |
514 | if (p1[i] != p2[i]) | |
515 | return 1; | |
516 | } | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
1da177e4 LT |
521 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
522 | { | |
2518c7c2 DM |
523 | struct xfrm_policy *pol; |
524 | struct xfrm_policy *delpol; | |
525 | struct hlist_head *chain; | |
a6c7ab55 | 526 | struct hlist_node *entry, *newpos; |
9b78a82c | 527 | struct dst_entry *gc_list; |
1da177e4 LT |
528 | |
529 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
530 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
531 | delpol = NULL; | |
532 | newpos = NULL; | |
2518c7c2 | 533 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 534 | if (pol->type == policy->type && |
2518c7c2 | 535 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
536 | xfrm_sec_ctx_match(pol->security, policy->security) && |
537 | !WARN_ON(delpol)) { | |
1da177e4 LT |
538 | if (excl) { |
539 | write_unlock_bh(&xfrm_policy_lock); | |
540 | return -EEXIST; | |
541 | } | |
1da177e4 LT |
542 | delpol = pol; |
543 | if (policy->priority > pol->priority) | |
544 | continue; | |
545 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 546 | newpos = &pol->bydst; |
1da177e4 LT |
547 | continue; |
548 | } | |
1da177e4 LT |
549 | if (delpol) |
550 | break; | |
1da177e4 LT |
551 | } |
552 | if (newpos) | |
2518c7c2 DM |
553 | hlist_add_after(newpos, &policy->bydst); |
554 | else | |
555 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 556 | xfrm_pol_hold(policy); |
2518c7c2 | 557 | xfrm_policy_count[dir]++; |
1da177e4 | 558 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
559 | if (delpol) { |
560 | hlist_del(&delpol->bydst); | |
561 | hlist_del(&delpol->byidx); | |
562 | xfrm_policy_count[dir]--; | |
563 | } | |
4e81bb83 | 564 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
2518c7c2 | 565 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
9d729f72 | 566 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
567 | policy->curlft.use_time = 0; |
568 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
569 | xfrm_pol_hold(policy); | |
570 | write_unlock_bh(&xfrm_policy_lock); | |
571 | ||
9b78a82c | 572 | if (delpol) |
1da177e4 | 573 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
574 | else if (xfrm_bydst_should_resize(dir, NULL)) |
575 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
576 | |
577 | read_lock_bh(&xfrm_policy_lock); | |
578 | gc_list = NULL; | |
2518c7c2 DM |
579 | entry = &policy->bydst; |
580 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
581 | struct dst_entry *dst; |
582 | ||
583 | write_lock(&policy->lock); | |
584 | dst = policy->bundles; | |
585 | if (dst) { | |
586 | struct dst_entry *tail = dst; | |
587 | while (tail->next) | |
588 | tail = tail->next; | |
589 | tail->next = gc_list; | |
590 | gc_list = dst; | |
591 | ||
592 | policy->bundles = NULL; | |
593 | } | |
594 | write_unlock(&policy->lock); | |
1da177e4 | 595 | } |
9b78a82c DM |
596 | read_unlock_bh(&xfrm_policy_lock); |
597 | ||
598 | while (gc_list) { | |
599 | struct dst_entry *dst = gc_list; | |
600 | ||
601 | gc_list = dst->next; | |
602 | dst_free(dst); | |
603 | } | |
604 | ||
1da177e4 LT |
605 | return 0; |
606 | } | |
607 | EXPORT_SYMBOL(xfrm_policy_insert); | |
608 | ||
4e81bb83 MN |
609 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
610 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
611 | struct xfrm_sec_ctx *ctx, int delete, |
612 | int *err) | |
1da177e4 | 613 | { |
2518c7c2 DM |
614 | struct xfrm_policy *pol, *ret; |
615 | struct hlist_head *chain; | |
616 | struct hlist_node *entry; | |
1da177e4 | 617 | |
ef41aaa0 | 618 | *err = 0; |
1da177e4 | 619 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
620 | chain = policy_hash_bysel(sel, sel->family, dir); |
621 | ret = NULL; | |
622 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
623 | if (pol->type == type && | |
624 | !selector_cmp(sel, &pol->selector) && | |
625 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 626 | xfrm_pol_hold(pol); |
2518c7c2 | 627 | if (delete) { |
ef41aaa0 EP |
628 | *err = security_xfrm_policy_delete(pol); |
629 | if (*err) { | |
630 | write_unlock_bh(&xfrm_policy_lock); | |
631 | return pol; | |
632 | } | |
2518c7c2 DM |
633 | hlist_del(&pol->bydst); |
634 | hlist_del(&pol->byidx); | |
635 | xfrm_policy_count[dir]--; | |
636 | } | |
637 | ret = pol; | |
1da177e4 LT |
638 | break; |
639 | } | |
640 | } | |
641 | write_unlock_bh(&xfrm_policy_lock); | |
642 | ||
2518c7c2 | 643 | if (ret && delete) { |
1da177e4 | 644 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 645 | xfrm_policy_kill(ret); |
1da177e4 | 646 | } |
2518c7c2 | 647 | return ret; |
1da177e4 | 648 | } |
df71837d | 649 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 650 | |
ef41aaa0 EP |
651 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
652 | int *err) | |
1da177e4 | 653 | { |
2518c7c2 DM |
654 | struct xfrm_policy *pol, *ret; |
655 | struct hlist_head *chain; | |
656 | struct hlist_node *entry; | |
1da177e4 | 657 | |
b5505c6e HX |
658 | *err = -ENOENT; |
659 | if (xfrm_policy_id2dir(id) != dir) | |
660 | return NULL; | |
661 | ||
ef41aaa0 | 662 | *err = 0; |
1da177e4 | 663 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
664 | chain = xfrm_policy_byidx + idx_hash(id); |
665 | ret = NULL; | |
666 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
667 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 668 | xfrm_pol_hold(pol); |
2518c7c2 | 669 | if (delete) { |
ef41aaa0 EP |
670 | *err = security_xfrm_policy_delete(pol); |
671 | if (*err) { | |
672 | write_unlock_bh(&xfrm_policy_lock); | |
673 | return pol; | |
674 | } | |
2518c7c2 DM |
675 | hlist_del(&pol->bydst); |
676 | hlist_del(&pol->byidx); | |
677 | xfrm_policy_count[dir]--; | |
678 | } | |
679 | ret = pol; | |
1da177e4 LT |
680 | break; |
681 | } | |
682 | } | |
683 | write_unlock_bh(&xfrm_policy_lock); | |
684 | ||
2518c7c2 | 685 | if (ret && delete) { |
1da177e4 | 686 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 687 | xfrm_policy_kill(ret); |
1da177e4 | 688 | } |
2518c7c2 | 689 | return ret; |
1da177e4 LT |
690 | } |
691 | EXPORT_SYMBOL(xfrm_policy_byid); | |
692 | ||
4aa2e62c JL |
693 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
694 | static inline int | |
695 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
1da177e4 | 696 | { |
4aa2e62c JL |
697 | int dir, err = 0; |
698 | ||
699 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
700 | struct xfrm_policy *pol; | |
701 | struct hlist_node *entry; | |
702 | int i; | |
703 | ||
704 | hlist_for_each_entry(pol, entry, | |
705 | &xfrm_policy_inexact[dir], bydst) { | |
706 | if (pol->type != type) | |
707 | continue; | |
708 | err = security_xfrm_policy_delete(pol); | |
709 | if (err) { | |
ab5f5e8b JL |
710 | xfrm_audit_policy_delete(pol, 0, |
711 | audit_info->loginuid, | |
712 | audit_info->secid); | |
4aa2e62c JL |
713 | return err; |
714 | } | |
7dc12d6d | 715 | } |
4aa2e62c JL |
716 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
717 | hlist_for_each_entry(pol, entry, | |
718 | xfrm_policy_bydst[dir].table + i, | |
719 | bydst) { | |
720 | if (pol->type != type) | |
721 | continue; | |
722 | err = security_xfrm_policy_delete(pol); | |
723 | if (err) { | |
ab5f5e8b JL |
724 | xfrm_audit_policy_delete(pol, 0, |
725 | audit_info->loginuid, | |
726 | audit_info->secid); | |
4aa2e62c JL |
727 | return err; |
728 | } | |
729 | } | |
730 | } | |
731 | } | |
732 | return err; | |
733 | } | |
734 | #else | |
735 | static inline int | |
736 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
737 | { | |
738 | return 0; | |
739 | } | |
740 | #endif | |
741 | ||
742 | int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) | |
743 | { | |
744 | int dir, err = 0; | |
1da177e4 LT |
745 | |
746 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c JL |
747 | |
748 | err = xfrm_policy_flush_secctx_check(type, audit_info); | |
749 | if (err) | |
750 | goto out; | |
751 | ||
1da177e4 | 752 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
753 | struct xfrm_policy *pol; |
754 | struct hlist_node *entry; | |
ae8c0577 | 755 | int i, killed; |
2518c7c2 | 756 | |
ae8c0577 | 757 | killed = 0; |
2518c7c2 DM |
758 | again1: |
759 | hlist_for_each_entry(pol, entry, | |
760 | &xfrm_policy_inexact[dir], bydst) { | |
761 | if (pol->type != type) | |
762 | continue; | |
763 | hlist_del(&pol->bydst); | |
764 | hlist_del(&pol->byidx); | |
1da177e4 LT |
765 | write_unlock_bh(&xfrm_policy_lock); |
766 | ||
ab5f5e8b JL |
767 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
768 | audit_info->secid); | |
161a09e7 | 769 | |
2518c7c2 | 770 | xfrm_policy_kill(pol); |
ae8c0577 | 771 | killed++; |
1da177e4 LT |
772 | |
773 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
774 | goto again1; |
775 | } | |
776 | ||
777 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
778 | again2: | |
779 | hlist_for_each_entry(pol, entry, | |
780 | xfrm_policy_bydst[dir].table + i, | |
781 | bydst) { | |
782 | if (pol->type != type) | |
783 | continue; | |
784 | hlist_del(&pol->bydst); | |
785 | hlist_del(&pol->byidx); | |
786 | write_unlock_bh(&xfrm_policy_lock); | |
787 | ||
ab5f5e8b JL |
788 | xfrm_audit_policy_delete(pol, 1, |
789 | audit_info->loginuid, | |
790 | audit_info->secid); | |
2518c7c2 | 791 | xfrm_policy_kill(pol); |
ae8c0577 | 792 | killed++; |
2518c7c2 DM |
793 | |
794 | write_lock_bh(&xfrm_policy_lock); | |
795 | goto again2; | |
796 | } | |
1da177e4 | 797 | } |
2518c7c2 | 798 | |
ae8c0577 | 799 | xfrm_policy_count[dir] -= killed; |
1da177e4 LT |
800 | } |
801 | atomic_inc(&flow_cache_genid); | |
4aa2e62c | 802 | out: |
1da177e4 | 803 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 804 | return err; |
1da177e4 LT |
805 | } |
806 | EXPORT_SYMBOL(xfrm_policy_flush); | |
807 | ||
4e81bb83 | 808 | int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
809 | void *data) |
810 | { | |
baf5d743 | 811 | struct xfrm_policy *pol, *last = NULL; |
2518c7c2 | 812 | struct hlist_node *entry; |
baf5d743 | 813 | int dir, last_dir = 0, count, error; |
1da177e4 LT |
814 | |
815 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 | 816 | count = 0; |
1da177e4 LT |
817 | |
818 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
819 | struct hlist_head *table = xfrm_policy_bydst[dir].table; |
820 | int i; | |
821 | ||
822 | hlist_for_each_entry(pol, entry, | |
823 | &xfrm_policy_inexact[dir], bydst) { | |
824 | if (pol->type != type) | |
825 | continue; | |
baf5d743 JHS |
826 | if (last) { |
827 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
828 | count, data); | |
829 | if (error) | |
830 | goto out; | |
831 | } | |
832 | last = pol; | |
833 | last_dir = dir; | |
834 | count++; | |
1da177e4 | 835 | } |
2518c7c2 DM |
836 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
837 | hlist_for_each_entry(pol, entry, table + i, bydst) { | |
838 | if (pol->type != type) | |
839 | continue; | |
baf5d743 JHS |
840 | if (last) { |
841 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
842 | count, data); | |
843 | if (error) | |
844 | goto out; | |
845 | } | |
846 | last = pol; | |
847 | last_dir = dir; | |
848 | count++; | |
2518c7c2 DM |
849 | } |
850 | } | |
1da177e4 | 851 | } |
baf5d743 JHS |
852 | if (count == 0) { |
853 | error = -ENOENT; | |
854 | goto out; | |
855 | } | |
856 | error = func(last, last_dir % XFRM_POLICY_MAX, 0, data); | |
1da177e4 LT |
857 | out: |
858 | read_unlock_bh(&xfrm_policy_lock); | |
859 | return error; | |
860 | } | |
861 | EXPORT_SYMBOL(xfrm_policy_walk); | |
862 | ||
134b0fc5 JM |
863 | /* |
864 | * Find policy to apply to this flow. | |
865 | * | |
866 | * Returns 0 if policy found, else an -errno. | |
867 | */ | |
2518c7c2 DM |
868 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
869 | u8 type, u16 family, int dir) | |
1da177e4 | 870 | { |
2518c7c2 | 871 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 872 | int match, ret = -ESRCH; |
1da177e4 | 873 | |
2518c7c2 DM |
874 | if (pol->family != family || |
875 | pol->type != type) | |
134b0fc5 | 876 | return ret; |
1da177e4 | 877 | |
2518c7c2 | 878 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 JM |
879 | if (match) |
880 | ret = security_xfrm_policy_lookup(pol, fl->secid, dir); | |
2518c7c2 | 881 | |
134b0fc5 | 882 | return ret; |
2518c7c2 | 883 | } |
1da177e4 | 884 | |
2518c7c2 DM |
885 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
886 | u16 family, u8 dir) | |
887 | { | |
134b0fc5 | 888 | int err; |
2518c7c2 DM |
889 | struct xfrm_policy *pol, *ret; |
890 | xfrm_address_t *daddr, *saddr; | |
891 | struct hlist_node *entry; | |
892 | struct hlist_head *chain; | |
acba48e1 | 893 | u32 priority = ~0U; |
df71837d | 894 | |
2518c7c2 DM |
895 | daddr = xfrm_flowi_daddr(fl, family); |
896 | saddr = xfrm_flowi_saddr(fl, family); | |
897 | if (unlikely(!daddr || !saddr)) | |
898 | return NULL; | |
899 | ||
900 | read_lock_bh(&xfrm_policy_lock); | |
901 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
902 | ret = NULL; | |
903 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
904 | err = xfrm_policy_match(pol, fl, type, family, dir); |
905 | if (err) { | |
906 | if (err == -ESRCH) | |
907 | continue; | |
908 | else { | |
909 | ret = ERR_PTR(err); | |
910 | goto fail; | |
911 | } | |
912 | } else { | |
2518c7c2 | 913 | ret = pol; |
acba48e1 | 914 | priority = ret->priority; |
2518c7c2 DM |
915 | break; |
916 | } | |
917 | } | |
acba48e1 DM |
918 | chain = &xfrm_policy_inexact[dir]; |
919 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
920 | err = xfrm_policy_match(pol, fl, type, family, dir); |
921 | if (err) { | |
922 | if (err == -ESRCH) | |
923 | continue; | |
924 | else { | |
925 | ret = ERR_PTR(err); | |
926 | goto fail; | |
927 | } | |
928 | } else if (pol->priority < priority) { | |
acba48e1 DM |
929 | ret = pol; |
930 | break; | |
1da177e4 LT |
931 | } |
932 | } | |
acba48e1 DM |
933 | if (ret) |
934 | xfrm_pol_hold(ret); | |
134b0fc5 | 935 | fail: |
1da177e4 | 936 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 937 | |
2518c7c2 | 938 | return ret; |
4e81bb83 MN |
939 | } |
940 | ||
134b0fc5 | 941 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
942 | void **objp, atomic_t **obj_refp) |
943 | { | |
944 | struct xfrm_policy *pol; | |
134b0fc5 | 945 | int err = 0; |
4e81bb83 MN |
946 | |
947 | #ifdef CONFIG_XFRM_SUB_POLICY | |
948 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
949 | if (IS_ERR(pol)) { |
950 | err = PTR_ERR(pol); | |
951 | pol = NULL; | |
952 | } | |
953 | if (pol || err) | |
4e81bb83 MN |
954 | goto end; |
955 | #endif | |
956 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
957 | if (IS_ERR(pol)) { |
958 | err = PTR_ERR(pol); | |
959 | pol = NULL; | |
960 | } | |
4e81bb83 | 961 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 962 | end: |
4e81bb83 | 963 | #endif |
1da177e4 LT |
964 | if ((*objp = (void *) pol) != NULL) |
965 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 966 | return err; |
1da177e4 LT |
967 | } |
968 | ||
df71837d TJ |
969 | static inline int policy_to_flow_dir(int dir) |
970 | { | |
971 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
972 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
973 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
974 | return dir; | |
975 | switch (dir) { | |
976 | default: | |
977 | case XFRM_POLICY_IN: | |
978 | return FLOW_DIR_IN; | |
979 | case XFRM_POLICY_OUT: | |
980 | return FLOW_DIR_OUT; | |
981 | case XFRM_POLICY_FWD: | |
982 | return FLOW_DIR_FWD; | |
3ff50b79 | 983 | } |
df71837d TJ |
984 | } |
985 | ||
e0d1caa7 | 986 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
987 | { |
988 | struct xfrm_policy *pol; | |
989 | ||
990 | read_lock_bh(&xfrm_policy_lock); | |
991 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 992 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 993 | sk->sk_family); |
a716c119 | 994 | int err = 0; |
df71837d | 995 | |
3bccfbc7 VY |
996 | if (match) { |
997 | err = security_xfrm_policy_lookup(pol, fl->secid, | |
998 | policy_to_flow_dir(dir)); | |
999 | if (!err) | |
1000 | xfrm_pol_hold(pol); | |
1001 | else if (err == -ESRCH) | |
1002 | pol = NULL; | |
1003 | else | |
1004 | pol = ERR_PTR(err); | |
1005 | } else | |
1da177e4 LT |
1006 | pol = NULL; |
1007 | } | |
1008 | read_unlock_bh(&xfrm_policy_lock); | |
1009 | return pol; | |
1010 | } | |
1011 | ||
1012 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1013 | { | |
2518c7c2 DM |
1014 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1015 | pol->family, dir); | |
4e81bb83 | 1016 | |
2518c7c2 DM |
1017 | hlist_add_head(&pol->bydst, chain); |
1018 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); | |
1019 | xfrm_policy_count[dir]++; | |
1da177e4 | 1020 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1021 | |
1022 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1023 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1024 | } |
1025 | ||
1026 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1027 | int dir) | |
1028 | { | |
2518c7c2 DM |
1029 | if (hlist_unhashed(&pol->bydst)) |
1030 | return NULL; | |
1da177e4 | 1031 | |
2518c7c2 DM |
1032 | hlist_del(&pol->bydst); |
1033 | hlist_del(&pol->byidx); | |
1034 | xfrm_policy_count[dir]--; | |
1035 | ||
1036 | return pol; | |
1da177e4 LT |
1037 | } |
1038 | ||
4666faab | 1039 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1040 | { |
1041 | write_lock_bh(&xfrm_policy_lock); | |
1042 | pol = __xfrm_policy_unlink(pol, dir); | |
1043 | write_unlock_bh(&xfrm_policy_lock); | |
1044 | if (pol) { | |
1045 | if (dir < XFRM_POLICY_MAX) | |
1046 | atomic_inc(&flow_cache_genid); | |
1047 | xfrm_policy_kill(pol); | |
4666faab | 1048 | return 0; |
1da177e4 | 1049 | } |
4666faab | 1050 | return -ENOENT; |
1da177e4 | 1051 | } |
a70fcb0b | 1052 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1053 | |
1054 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1055 | { | |
1056 | struct xfrm_policy *old_pol; | |
1057 | ||
4e81bb83 MN |
1058 | #ifdef CONFIG_XFRM_SUB_POLICY |
1059 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1060 | return -EINVAL; | |
1061 | #endif | |
1062 | ||
1da177e4 LT |
1063 | write_lock_bh(&xfrm_policy_lock); |
1064 | old_pol = sk->sk_policy[dir]; | |
1065 | sk->sk_policy[dir] = pol; | |
1066 | if (pol) { | |
9d729f72 | 1067 | pol->curlft.add_time = get_seconds(); |
4e81bb83 | 1068 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1069 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1070 | } | |
1071 | if (old_pol) | |
1072 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1073 | write_unlock_bh(&xfrm_policy_lock); | |
1074 | ||
1075 | if (old_pol) { | |
1076 | xfrm_policy_kill(old_pol); | |
1077 | } | |
1078 | return 0; | |
1079 | } | |
1080 | ||
1081 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1082 | { | |
1083 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
1084 | ||
1085 | if (newp) { | |
1086 | newp->selector = old->selector; | |
df71837d TJ |
1087 | if (security_xfrm_policy_clone(old, newp)) { |
1088 | kfree(newp); | |
1089 | return NULL; /* ENOMEM */ | |
1090 | } | |
1da177e4 LT |
1091 | newp->lft = old->lft; |
1092 | newp->curlft = old->curlft; | |
1093 | newp->action = old->action; | |
1094 | newp->flags = old->flags; | |
1095 | newp->xfrm_nr = old->xfrm_nr; | |
1096 | newp->index = old->index; | |
4e81bb83 | 1097 | newp->type = old->type; |
1da177e4 LT |
1098 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1099 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1100 | write_lock_bh(&xfrm_policy_lock); | |
1101 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1102 | write_unlock_bh(&xfrm_policy_lock); | |
1103 | xfrm_pol_put(newp); | |
1104 | } | |
1105 | return newp; | |
1106 | } | |
1107 | ||
1108 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1109 | { | |
1110 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1111 | *p1 = sk->sk_policy[1]; | |
1112 | ||
1113 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1114 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1115 | return -ENOMEM; | |
1116 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1117 | return -ENOMEM; | |
1118 | return 0; | |
1119 | } | |
1120 | ||
a1e59abf PM |
1121 | static int |
1122 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1123 | unsigned short family) | |
1124 | { | |
1125 | int err; | |
1126 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1127 | ||
1128 | if (unlikely(afinfo == NULL)) | |
1129 | return -EINVAL; | |
1130 | err = afinfo->get_saddr(local, remote); | |
1131 | xfrm_policy_put_afinfo(afinfo); | |
1132 | return err; | |
1133 | } | |
1134 | ||
1da177e4 LT |
1135 | /* Resolve list of templates for the flow, given policy. */ |
1136 | ||
1137 | static int | |
4e81bb83 MN |
1138 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1139 | struct xfrm_state **xfrm, | |
1140 | unsigned short family) | |
1da177e4 LT |
1141 | { |
1142 | int nx; | |
1143 | int i, error; | |
1144 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1145 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1146 | xfrm_address_t tmp; |
1da177e4 LT |
1147 | |
1148 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1149 | struct xfrm_state *x; | |
1150 | xfrm_address_t *remote = daddr; | |
1151 | xfrm_address_t *local = saddr; | |
1152 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1153 | ||
48b8d783 JK |
1154 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1155 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1156 | remote = &tmpl->id.daddr; |
1157 | local = &tmpl->saddr; | |
76b3f055 | 1158 | family = tmpl->encap_family; |
a1e59abf PM |
1159 | if (xfrm_addr_any(local, family)) { |
1160 | error = xfrm_get_saddr(&tmp, remote, family); | |
1161 | if (error) | |
1162 | goto fail; | |
1163 | local = &tmp; | |
1164 | } | |
1da177e4 LT |
1165 | } |
1166 | ||
1167 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1168 | ||
1169 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1170 | xfrm[nx++] = x; | |
1171 | daddr = remote; | |
1172 | saddr = local; | |
1173 | continue; | |
1174 | } | |
1175 | if (x) { | |
1176 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1177 | -EINVAL : -EAGAIN); | |
1178 | xfrm_state_put(x); | |
1179 | } | |
1180 | ||
1181 | if (!tmpl->optional) | |
1182 | goto fail; | |
1183 | } | |
1184 | return nx; | |
1185 | ||
1186 | fail: | |
1187 | for (nx--; nx>=0; nx--) | |
1188 | xfrm_state_put(xfrm[nx]); | |
1189 | return error; | |
1190 | } | |
1191 | ||
4e81bb83 MN |
1192 | static int |
1193 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1194 | struct xfrm_state **xfrm, | |
1195 | unsigned short family) | |
1196 | { | |
41a49cc3 MN |
1197 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1198 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1199 | int cnx = 0; |
1200 | int error; | |
1201 | int ret; | |
1202 | int i; | |
1203 | ||
1204 | for (i = 0; i < npols; i++) { | |
1205 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1206 | error = -ENOBUFS; | |
1207 | goto fail; | |
1208 | } | |
41a49cc3 MN |
1209 | |
1210 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1211 | if (ret < 0) { |
1212 | error = ret; | |
1213 | goto fail; | |
1214 | } else | |
1215 | cnx += ret; | |
1216 | } | |
1217 | ||
41a49cc3 MN |
1218 | /* found states are sorted for outbound processing */ |
1219 | if (npols > 1) | |
1220 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1221 | ||
4e81bb83 MN |
1222 | return cnx; |
1223 | ||
1224 | fail: | |
1225 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1226 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1227 | return error; |
1228 | ||
1229 | } | |
1230 | ||
1da177e4 LT |
1231 | /* Check that the bundle accepts the flow and its components are |
1232 | * still valid. | |
1233 | */ | |
1234 | ||
1235 | static struct dst_entry * | |
1236 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1237 | { | |
1238 | struct dst_entry *x; | |
1239 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1240 | if (unlikely(afinfo == NULL)) | |
1241 | return ERR_PTR(-EINVAL); | |
1242 | x = afinfo->find_bundle(fl, policy); | |
1243 | xfrm_policy_put_afinfo(afinfo); | |
1244 | return x; | |
1245 | } | |
1246 | ||
25ee3286 HX |
1247 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
1248 | { | |
1249 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1250 | int tos; | |
1da177e4 | 1251 | |
25ee3286 HX |
1252 | if (!afinfo) |
1253 | return -EINVAL; | |
1254 | ||
1255 | tos = afinfo->get_tos(fl); | |
1256 | ||
1257 | xfrm_policy_put_afinfo(afinfo); | |
1258 | ||
1259 | return tos; | |
1260 | } | |
1261 | ||
1262 | static inline struct xfrm_dst *xfrm_alloc_dst(int family) | |
1da177e4 | 1263 | { |
1da177e4 | 1264 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
25ee3286 HX |
1265 | struct xfrm_dst *xdst; |
1266 | ||
1267 | if (!afinfo) | |
1268 | return ERR_PTR(-EINVAL); | |
1269 | ||
1270 | xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS); | |
1271 | ||
1272 | xfrm_policy_put_afinfo(afinfo); | |
1273 | ||
1274 | return xdst; | |
1275 | } | |
1276 | ||
a1b05140 MN |
1277 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1278 | int nfheader_len) | |
1279 | { | |
1280 | struct xfrm_policy_afinfo *afinfo = | |
1281 | xfrm_policy_get_afinfo(dst->ops->family); | |
1282 | int err; | |
1283 | ||
1284 | if (!afinfo) | |
1285 | return -EINVAL; | |
1286 | ||
1287 | err = afinfo->init_path(path, dst, nfheader_len); | |
1288 | ||
1289 | xfrm_policy_put_afinfo(afinfo); | |
1290 | ||
1291 | return err; | |
1292 | } | |
1293 | ||
25ee3286 HX |
1294 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) |
1295 | { | |
1296 | struct xfrm_policy_afinfo *afinfo = | |
1297 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1298 | int err; | |
1299 | ||
1300 | if (!afinfo) | |
1da177e4 | 1301 | return -EINVAL; |
25ee3286 HX |
1302 | |
1303 | err = afinfo->fill_dst(xdst, dev); | |
1304 | ||
1da177e4 | 1305 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1306 | |
1da177e4 LT |
1307 | return err; |
1308 | } | |
1309 | ||
25ee3286 HX |
1310 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1311 | * all the metrics... Shortly, bundle a bundle. | |
1312 | */ | |
1313 | ||
1314 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1315 | struct xfrm_state **xfrm, int nx, | |
1316 | struct flowi *fl, | |
1317 | struct dst_entry *dst) | |
1318 | { | |
1319 | unsigned long now = jiffies; | |
1320 | struct net_device *dev; | |
1321 | struct dst_entry *dst_prev = NULL; | |
1322 | struct dst_entry *dst0 = NULL; | |
1323 | int i = 0; | |
1324 | int err; | |
1325 | int header_len = 0; | |
a1b05140 | 1326 | int nfheader_len = 0; |
25ee3286 HX |
1327 | int trailer_len = 0; |
1328 | int tos; | |
1329 | int family = policy->selector.family; | |
1330 | ||
1331 | tos = xfrm_get_tos(fl, family); | |
1332 | err = tos; | |
1333 | if (tos < 0) | |
1334 | goto put_states; | |
1335 | ||
1336 | dst_hold(dst); | |
1337 | ||
1338 | for (; i < nx; i++) { | |
1339 | struct xfrm_dst *xdst = xfrm_alloc_dst(family); | |
1340 | struct dst_entry *dst1 = &xdst->u.dst; | |
1341 | ||
1342 | err = PTR_ERR(xdst); | |
1343 | if (IS_ERR(xdst)) { | |
1344 | dst_release(dst); | |
1345 | goto put_states; | |
1346 | } | |
1347 | ||
1348 | if (!dst_prev) | |
1349 | dst0 = dst1; | |
1350 | else { | |
1351 | dst_prev->child = dst_clone(dst1); | |
1352 | dst1->flags |= DST_NOHASH; | |
1353 | } | |
1354 | ||
1355 | xdst->route = dst; | |
1356 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); | |
1357 | ||
1358 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1359 | family = xfrm[i]->props.family; | |
1360 | dst = xfrm_dst_lookup(xfrm[i], tos, family); | |
1361 | err = PTR_ERR(dst); | |
1362 | if (IS_ERR(dst)) | |
1363 | goto put_states; | |
1364 | } else | |
1365 | dst_hold(dst); | |
1366 | ||
1367 | dst1->xfrm = xfrm[i]; | |
1368 | xdst->genid = xfrm[i]->genid; | |
1369 | ||
1370 | dst1->obsolete = -1; | |
1371 | dst1->flags |= DST_HOST; | |
1372 | dst1->lastuse = now; | |
1373 | ||
1374 | dst1->input = dst_discard; | |
1375 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1376 | ||
1377 | dst1->next = dst_prev; | |
1378 | dst_prev = dst1; | |
1379 | ||
1380 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1381 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1382 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1383 | trailer_len += xfrm[i]->props.trailer_len; |
1384 | } | |
1385 | ||
1386 | dst_prev->child = dst; | |
1387 | dst0->path = dst; | |
1388 | ||
1389 | err = -ENODEV; | |
1390 | dev = dst->dev; | |
1391 | if (!dev) | |
1392 | goto free_dst; | |
1393 | ||
1394 | /* Copy neighbout for reachability confirmation */ | |
1395 | dst0->neighbour = neigh_clone(dst->neighbour); | |
1396 | ||
a1b05140 | 1397 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1398 | xfrm_init_pmtu(dst_prev); |
1399 | ||
1400 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1401 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1402 | ||
1403 | err = xfrm_fill_dst(xdst, dev); | |
1404 | if (err) | |
1405 | goto free_dst; | |
1406 | ||
1407 | dst_prev->header_len = header_len; | |
1408 | dst_prev->trailer_len = trailer_len; | |
1409 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1410 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1411 | } | |
1412 | ||
1413 | out: | |
1414 | return dst0; | |
1415 | ||
1416 | put_states: | |
1417 | for (; i < nx; i++) | |
1418 | xfrm_state_put(xfrm[i]); | |
1419 | free_dst: | |
1420 | if (dst0) | |
1421 | dst_free(dst0); | |
1422 | dst0 = ERR_PTR(err); | |
1423 | goto out; | |
1424 | } | |
1425 | ||
157bfc25 MN |
1426 | static int inline |
1427 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1428 | { | |
1429 | if (!*target) { | |
1430 | *target = kmalloc(size, GFP_ATOMIC); | |
1431 | if (!*target) | |
1432 | return -ENOMEM; | |
1433 | } | |
1434 | memcpy(*target, src, size); | |
1435 | return 0; | |
1436 | } | |
1437 | ||
1438 | static int inline | |
1439 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1440 | { | |
1441 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1442 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1443 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1444 | sel, sizeof(*sel)); | |
1445 | #else | |
1446 | return 0; | |
1447 | #endif | |
1448 | } | |
1449 | ||
1450 | static int inline | |
1451 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1452 | { | |
1453 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1454 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1455 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1456 | #else | |
1457 | return 0; | |
1458 | #endif | |
1459 | } | |
1da177e4 LT |
1460 | |
1461 | static int stale_bundle(struct dst_entry *dst); | |
1462 | ||
1463 | /* Main function: finds/creates a bundle for given flow. | |
1464 | * | |
1465 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1466 | * on interfaces with disabled IPsec. | |
1467 | */ | |
14e50e57 DM |
1468 | int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
1469 | struct sock *sk, int flags) | |
1da177e4 LT |
1470 | { |
1471 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1472 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1473 | int npols; | |
1474 | int pol_dead; | |
1475 | int xfrm_nr; | |
1476 | int pi; | |
1da177e4 LT |
1477 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1478 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1479 | int nx = 0; | |
1480 | int err; | |
1481 | u32 genid; | |
42cf93cd | 1482 | u16 family; |
df71837d | 1483 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1484 | |
1da177e4 LT |
1485 | restart: |
1486 | genid = atomic_read(&flow_cache_genid); | |
1487 | policy = NULL; | |
4e81bb83 MN |
1488 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1489 | pols[pi] = NULL; | |
1490 | npols = 0; | |
1491 | pol_dead = 0; | |
1492 | xfrm_nr = 0; | |
1493 | ||
f7944fb1 | 1494 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
e0d1caa7 | 1495 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
75b8c133 | 1496 | err = PTR_ERR(policy); |
0aa64774 MN |
1497 | if (IS_ERR(policy)) { |
1498 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); | |
75b8c133 | 1499 | goto dropdst; |
0aa64774 | 1500 | } |
3bccfbc7 | 1501 | } |
1da177e4 LT |
1502 | |
1503 | if (!policy) { | |
1504 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1505 | if ((dst_orig->flags & DST_NOXFRM) || |
1506 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
8b7817f3 | 1507 | goto nopol; |
1da177e4 | 1508 | |
e0d1caa7 | 1509 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1510 | dir, xfrm_policy_lookup); |
75b8c133 | 1511 | err = PTR_ERR(policy); |
134b0fc5 | 1512 | if (IS_ERR(policy)) |
75b8c133 | 1513 | goto dropdst; |
1da177e4 LT |
1514 | } |
1515 | ||
1516 | if (!policy) | |
8b7817f3 | 1517 | goto nopol; |
1da177e4 | 1518 | |
42cf93cd | 1519 | family = dst_orig->ops->family; |
4e81bb83 MN |
1520 | pols[0] = policy; |
1521 | npols ++; | |
1522 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 | 1523 | |
aef21785 | 1524 | err = -ENOENT; |
8b7817f3 HX |
1525 | if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP)) |
1526 | goto error; | |
1527 | ||
1528 | policy->curlft.use_time = get_seconds(); | |
1529 | ||
1da177e4 | 1530 | switch (policy->action) { |
5e5234ff | 1531 | default: |
1da177e4 LT |
1532 | case XFRM_POLICY_BLOCK: |
1533 | /* Prohibit the flow */ | |
0aa64774 | 1534 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1535 | err = -EPERM; |
1536 | goto error; | |
1da177e4 LT |
1537 | |
1538 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1539 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1540 | if (policy->xfrm_nr == 0) { |
1541 | /* Flow passes not transformed. */ | |
1542 | xfrm_pol_put(policy); | |
1543 | return 0; | |
1544 | } | |
4e81bb83 | 1545 | #endif |
1da177e4 LT |
1546 | |
1547 | /* Try to find matching bundle. | |
1548 | * | |
1549 | * LATER: help from flow cache. It is optional, this | |
1550 | * is required only for output policy. | |
1551 | */ | |
1552 | dst = xfrm_find_bundle(fl, policy, family); | |
1553 | if (IS_ERR(dst)) { | |
0aa64774 | 1554 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
e104411b PM |
1555 | err = PTR_ERR(dst); |
1556 | goto error; | |
1da177e4 LT |
1557 | } |
1558 | ||
1559 | if (dst) | |
1560 | break; | |
1561 | ||
4e81bb83 MN |
1562 | #ifdef CONFIG_XFRM_SUB_POLICY |
1563 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1564 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1565 | fl, family, | |
1566 | XFRM_POLICY_OUT); | |
1567 | if (pols[1]) { | |
134b0fc5 | 1568 | if (IS_ERR(pols[1])) { |
0aa64774 | 1569 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); |
134b0fc5 JM |
1570 | err = PTR_ERR(pols[1]); |
1571 | goto error; | |
1572 | } | |
4e81bb83 | 1573 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
0aa64774 | 1574 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
4e81bb83 MN |
1575 | err = -EPERM; |
1576 | goto error; | |
1577 | } | |
1578 | npols ++; | |
1579 | xfrm_nr += pols[1]->xfrm_nr; | |
1580 | } | |
1581 | } | |
1582 | ||
1583 | /* | |
1584 | * Because neither flowi nor bundle information knows about | |
1585 | * transformation template size. On more than one policy usage | |
1586 | * we can realize whether all of them is bypass or not after | |
1587 | * they are searched. See above not-transformed bypass | |
1588 | * is surrounded by non-sub policy configuration, too. | |
1589 | */ | |
1590 | if (xfrm_nr == 0) { | |
1591 | /* Flow passes not transformed. */ | |
1592 | xfrm_pols_put(pols, npols); | |
1593 | return 0; | |
1594 | } | |
1595 | ||
1596 | #endif | |
1597 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1598 | |
1599 | if (unlikely(nx<0)) { | |
1600 | err = nx; | |
14e50e57 DM |
1601 | if (err == -EAGAIN && sysctl_xfrm_larval_drop) { |
1602 | /* EREMOTE tells the caller to generate | |
1603 | * a one-shot blackhole route. | |
1604 | */ | |
1605 | xfrm_pol_put(policy); | |
1606 | return -EREMOTE; | |
1607 | } | |
815f4e57 | 1608 | if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) { |
1da177e4 LT |
1609 | DECLARE_WAITQUEUE(wait, current); |
1610 | ||
1611 | add_wait_queue(&km_waitq, &wait); | |
1612 | set_current_state(TASK_INTERRUPTIBLE); | |
1613 | schedule(); | |
1614 | set_current_state(TASK_RUNNING); | |
1615 | remove_wait_queue(&km_waitq, &wait); | |
1616 | ||
4e81bb83 | 1617 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1618 | |
1619 | if (nx == -EAGAIN && signal_pending(current)) { | |
0aa64774 | 1620 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 LT |
1621 | err = -ERESTART; |
1622 | goto error; | |
1623 | } | |
1624 | if (nx == -EAGAIN || | |
1625 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1626 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1627 | goto restart; |
1628 | } | |
1629 | err = nx; | |
1630 | } | |
0aa64774 MN |
1631 | if (err < 0) { |
1632 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); | |
1da177e4 | 1633 | goto error; |
0aa64774 | 1634 | } |
1da177e4 LT |
1635 | } |
1636 | if (nx == 0) { | |
1637 | /* Flow passes not transformed. */ | |
4e81bb83 | 1638 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1639 | return 0; |
1640 | } | |
1641 | ||
25ee3286 HX |
1642 | dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); |
1643 | err = PTR_ERR(dst); | |
0aa64774 MN |
1644 | if (IS_ERR(dst)) { |
1645 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1da177e4 | 1646 | goto error; |
0aa64774 | 1647 | } |
1da177e4 | 1648 | |
4e81bb83 MN |
1649 | for (pi = 0; pi < npols; pi++) { |
1650 | read_lock_bh(&pols[pi]->lock); | |
1651 | pol_dead |= pols[pi]->dead; | |
1652 | read_unlock_bh(&pols[pi]->lock); | |
1653 | } | |
1654 | ||
1da177e4 | 1655 | write_lock_bh(&policy->lock); |
4e81bb83 | 1656 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1657 | /* Wow! While we worked on resolving, this |
1658 | * policy has gone. Retry. It is not paranoia, | |
1659 | * we just cannot enlist new bundle to dead object. | |
1660 | * We can't enlist stable bundles either. | |
1661 | */ | |
1662 | write_unlock_bh(&policy->lock); | |
1da177e4 LT |
1663 | if (dst) |
1664 | dst_free(dst); | |
00de651d | 1665 | |
0aa64774 MN |
1666 | if (pol_dead) |
1667 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD); | |
1668 | else | |
1669 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
00de651d HX |
1670 | err = -EHOSTUNREACH; |
1671 | goto error; | |
1da177e4 | 1672 | } |
157bfc25 MN |
1673 | |
1674 | if (npols > 1) | |
1675 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1676 | else | |
1677 | err = xfrm_dst_update_origin(dst, fl); | |
1678 | if (unlikely(err)) { | |
1679 | write_unlock_bh(&policy->lock); | |
1680 | if (dst) | |
1681 | dst_free(dst); | |
0aa64774 | 1682 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
157bfc25 MN |
1683 | goto error; |
1684 | } | |
1685 | ||
1da177e4 LT |
1686 | dst->next = policy->bundles; |
1687 | policy->bundles = dst; | |
1688 | dst_hold(dst); | |
1689 | write_unlock_bh(&policy->lock); | |
1690 | } | |
1691 | *dst_p = dst; | |
1692 | dst_release(dst_orig); | |
a716c119 | 1693 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1694 | return 0; |
1695 | ||
1696 | error: | |
4e81bb83 | 1697 | xfrm_pols_put(pols, npols); |
75b8c133 HX |
1698 | dropdst: |
1699 | dst_release(dst_orig); | |
1da177e4 LT |
1700 | *dst_p = NULL; |
1701 | return err; | |
8b7817f3 HX |
1702 | |
1703 | nopol: | |
aef21785 | 1704 | err = -ENOENT; |
8b7817f3 HX |
1705 | if (flags & XFRM_LOOKUP_ICMP) |
1706 | goto dropdst; | |
1707 | return 0; | |
1da177e4 | 1708 | } |
14e50e57 DM |
1709 | EXPORT_SYMBOL(__xfrm_lookup); |
1710 | ||
1711 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1712 | struct sock *sk, int flags) | |
1713 | { | |
1714 | int err = __xfrm_lookup(dst_p, fl, sk, flags); | |
1715 | ||
1716 | if (err == -EREMOTE) { | |
1717 | dst_release(*dst_p); | |
1718 | *dst_p = NULL; | |
1719 | err = -EAGAIN; | |
1720 | } | |
1721 | ||
1722 | return err; | |
1723 | } | |
1da177e4 LT |
1724 | EXPORT_SYMBOL(xfrm_lookup); |
1725 | ||
df0ba92a MN |
1726 | static inline int |
1727 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1728 | { | |
1729 | struct xfrm_state *x; | |
df0ba92a MN |
1730 | |
1731 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1732 | return 0; | |
1733 | x = skb->sp->xvec[idx]; | |
1734 | if (!x->type->reject) | |
1735 | return 0; | |
1ecafede | 1736 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1737 | } |
1738 | ||
1da177e4 LT |
1739 | /* When skb is transformed back to its "native" form, we have to |
1740 | * check policy restrictions. At the moment we make this in maximally | |
1741 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1742 | * have policy cached at them. | |
1743 | */ | |
1744 | ||
1745 | static inline int | |
a716c119 | 1746 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1747 | unsigned short family) |
1748 | { | |
1749 | if (xfrm_state_kern(x)) | |
928ba416 | 1750 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1751 | return x->id.proto == tmpl->id.proto && |
1752 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1753 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1754 | x->props.mode == tmpl->mode && | |
f3bd4840 MN |
1755 | ((tmpl->aalgos & (1<<x->props.aalgo)) || |
1756 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && | |
7e49e6de MN |
1757 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1758 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1759 | } |
1760 | ||
df0ba92a MN |
1761 | /* |
1762 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1763 | * because of optional transport mode, or next index of the mathced secpath | |
1764 | * state with the template. | |
1765 | * -1 is returned when no matching template is found. | |
1766 | * Otherwise "-2 - errored_index" is returned. | |
1767 | */ | |
1da177e4 LT |
1768 | static inline int |
1769 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1770 | unsigned short family) | |
1771 | { | |
1772 | int idx = start; | |
1773 | ||
1774 | if (tmpl->optional) { | |
7e49e6de | 1775 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1776 | return start; |
1777 | } else | |
1778 | start = -1; | |
1779 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1780 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1781 | return ++idx; |
df0ba92a MN |
1782 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1783 | if (start == -1) | |
1784 | start = -2-idx; | |
1da177e4 | 1785 | break; |
df0ba92a | 1786 | } |
1da177e4 LT |
1787 | } |
1788 | return start; | |
1789 | } | |
1790 | ||
d5422efe HX |
1791 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1792 | unsigned int family, int reverse) | |
1da177e4 LT |
1793 | { |
1794 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1795 | int err; |
1da177e4 LT |
1796 | |
1797 | if (unlikely(afinfo == NULL)) | |
1798 | return -EAFNOSUPPORT; | |
1799 | ||
d5422efe | 1800 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1801 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1802 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1803 | return err; |
1da177e4 | 1804 | } |
d5422efe | 1805 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1806 | |
df0ba92a | 1807 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1808 | { |
1809 | for (; k < sp->len; k++) { | |
df0ba92a | 1810 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1811 | *idxp = k; |
1da177e4 | 1812 | return 1; |
df0ba92a | 1813 | } |
1da177e4 LT |
1814 | } |
1815 | ||
1816 | return 0; | |
1817 | } | |
1818 | ||
a716c119 | 1819 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1820 | unsigned short family) |
1821 | { | |
1822 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1823 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1824 | int npols = 0; | |
1825 | int xfrm_nr; | |
1826 | int pi; | |
d5422efe | 1827 | int reverse; |
1da177e4 | 1828 | struct flowi fl; |
d5422efe | 1829 | u8 fl_dir; |
df0ba92a | 1830 | int xerr_idx = -1; |
1da177e4 | 1831 | |
d5422efe HX |
1832 | reverse = dir & ~XFRM_POLICY_MASK; |
1833 | dir &= XFRM_POLICY_MASK; | |
1834 | fl_dir = policy_to_flow_dir(dir); | |
1835 | ||
0aa64774 MN |
1836 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
1837 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 1838 | return 0; |
0aa64774 MN |
1839 | } |
1840 | ||
eb9c7ebe | 1841 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1842 | |
1843 | /* First, check used SA against their selectors. */ | |
1844 | if (skb->sp) { | |
1845 | int i; | |
1846 | ||
1847 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 1848 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 MN |
1849 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
1850 | XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH); | |
1da177e4 | 1851 | return 0; |
0aa64774 | 1852 | } |
1da177e4 LT |
1853 | } |
1854 | } | |
1855 | ||
1856 | pol = NULL; | |
3bccfbc7 | 1857 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1858 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 MN |
1859 | if (IS_ERR(pol)) { |
1860 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
3bccfbc7 | 1861 | return 0; |
0aa64774 | 1862 | } |
3bccfbc7 | 1863 | } |
1da177e4 LT |
1864 | |
1865 | if (!pol) | |
e0d1caa7 | 1866 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1867 | xfrm_policy_lookup); |
1868 | ||
0aa64774 MN |
1869 | if (IS_ERR(pol)) { |
1870 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1871 | return 0; |
0aa64774 | 1872 | } |
134b0fc5 | 1873 | |
df0ba92a | 1874 | if (!pol) { |
d1d9facf | 1875 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 1876 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
0aa64774 | 1877 | XFRM_INC_STATS(LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
1878 | return 0; |
1879 | } | |
1880 | return 1; | |
1881 | } | |
1da177e4 | 1882 | |
9d729f72 | 1883 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1884 | |
4e81bb83 MN |
1885 | pols[0] = pol; |
1886 | npols ++; | |
1887 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1888 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1889 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1890 | &fl, family, | |
1891 | XFRM_POLICY_IN); | |
1892 | if (pols[1]) { | |
0aa64774 MN |
1893 | if (IS_ERR(pols[1])) { |
1894 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1895 | return 0; |
0aa64774 | 1896 | } |
9d729f72 | 1897 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1898 | npols ++; |
1899 | } | |
1900 | } | |
1901 | #endif | |
1902 | ||
1da177e4 LT |
1903 | if (pol->action == XFRM_POLICY_ALLOW) { |
1904 | struct sec_path *sp; | |
1905 | static struct sec_path dummy; | |
4e81bb83 | 1906 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1907 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1908 | struct xfrm_tmpl **tpp = tp; |
1909 | int ti = 0; | |
1da177e4 LT |
1910 | int i, k; |
1911 | ||
1912 | if ((sp = skb->sp) == NULL) | |
1913 | sp = &dummy; | |
1914 | ||
4e81bb83 MN |
1915 | for (pi = 0; pi < npols; pi++) { |
1916 | if (pols[pi] != pol && | |
0aa64774 MN |
1917 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
1918 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); | |
4e81bb83 | 1919 | goto reject; |
0aa64774 MN |
1920 | } |
1921 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1922 | XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR); | |
4e81bb83 | 1923 | goto reject_error; |
0aa64774 | 1924 | } |
4e81bb83 MN |
1925 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
1926 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
1927 | } | |
1928 | xfrm_nr = ti; | |
41a49cc3 MN |
1929 | if (npols > 1) { |
1930 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
1931 | tpp = stp; | |
1932 | } | |
4e81bb83 | 1933 | |
1da177e4 LT |
1934 | /* For each tunnel xfrm, find the first matching tmpl. |
1935 | * For each tmpl before that, find corresponding xfrm. | |
1936 | * Order is _important_. Later we will implement | |
1937 | * some barriers, but at the moment barriers | |
1938 | * are implied between each two transformations. | |
1939 | */ | |
4e81bb83 MN |
1940 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
1941 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 1942 | if (k < 0) { |
d1d9facf JM |
1943 | if (k < -1) |
1944 | /* "-2 - errored_index" returned */ | |
1945 | xerr_idx = -(2+k); | |
0aa64774 | 1946 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 1947 | goto reject; |
df0ba92a | 1948 | } |
1da177e4 LT |
1949 | } |
1950 | ||
0aa64774 MN |
1951 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
1952 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); | |
1da177e4 | 1953 | goto reject; |
0aa64774 | 1954 | } |
1da177e4 | 1955 | |
4e81bb83 | 1956 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1957 | return 1; |
1958 | } | |
0aa64774 | 1959 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
1960 | |
1961 | reject: | |
df0ba92a | 1962 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
1963 | reject_error: |
1964 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
1965 | return 0; |
1966 | } | |
1967 | EXPORT_SYMBOL(__xfrm_policy_check); | |
1968 | ||
1969 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
1970 | { | |
1971 | struct flowi fl; | |
1972 | ||
0aa64774 MN |
1973 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
1974 | /* XXX: we should have something like FWDHDRERROR here. */ | |
1975 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 1976 | return 0; |
0aa64774 | 1977 | } |
1da177e4 LT |
1978 | |
1979 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
1980 | } | |
1981 | EXPORT_SYMBOL(__xfrm_route_forward); | |
1982 | ||
d49c73c7 DM |
1983 | /* Optimize later using cookies and generation ids. */ |
1984 | ||
1da177e4 LT |
1985 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
1986 | { | |
d49c73c7 DM |
1987 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
1988 | * to "-1" to force all XFRM destinations to get validated by | |
1989 | * dst_ops->check on every use. We do this because when a | |
1990 | * normal route referenced by an XFRM dst is obsoleted we do | |
1991 | * not go looking around for all parent referencing XFRM dsts | |
1992 | * so that we can invalidate them. It is just too much work. | |
1993 | * Instead we make the checks here on every use. For example: | |
1994 | * | |
1995 | * XFRM dst A --> IPv4 dst X | |
1996 | * | |
1997 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
1998 | * in this example). If X is marked obsolete, "A" will not | |
1999 | * notice. That's what we are validating here via the | |
2000 | * stale_bundle() check. | |
2001 | * | |
2002 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2003 | * dst which causes it's ->obsolete field to be set to a | |
2004 | * positive non-zero integer. If an XFRM dst has been pruned | |
2005 | * like this, we want to force a new route lookup. | |
399c180a | 2006 | */ |
d49c73c7 DM |
2007 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2008 | return dst; | |
2009 | ||
1da177e4 LT |
2010 | return NULL; |
2011 | } | |
2012 | ||
2013 | static int stale_bundle(struct dst_entry *dst) | |
2014 | { | |
5b368e61 | 2015 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
2016 | } |
2017 | ||
aabc9761 | 2018 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2019 | { |
1da177e4 | 2020 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
5a3e55d6 | 2021 | dst->dev = dev->nd_net->loopback_dev; |
de3cb747 | 2022 | dev_hold(dst->dev); |
1da177e4 LT |
2023 | dev_put(dev); |
2024 | } | |
2025 | } | |
aabc9761 | 2026 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2027 | |
2028 | static void xfrm_link_failure(struct sk_buff *skb) | |
2029 | { | |
2030 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
2031 | return; | |
2032 | } | |
2033 | ||
2034 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2035 | { | |
2036 | if (dst) { | |
2037 | if (dst->obsolete) { | |
2038 | dst_release(dst); | |
2039 | dst = NULL; | |
2040 | } | |
2041 | } | |
2042 | return dst; | |
2043 | } | |
2044 | ||
2518c7c2 DM |
2045 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
2046 | { | |
2047 | struct dst_entry *dst, **dstp; | |
2048 | ||
2049 | write_lock(&pol->lock); | |
2050 | dstp = &pol->bundles; | |
2051 | while ((dst=*dstp) != NULL) { | |
2052 | if (func(dst)) { | |
2053 | *dstp = dst->next; | |
2054 | dst->next = *gc_list_p; | |
2055 | *gc_list_p = dst; | |
2056 | } else { | |
2057 | dstp = &dst->next; | |
2058 | } | |
2059 | } | |
2060 | write_unlock(&pol->lock); | |
2061 | } | |
2062 | ||
1da177e4 LT |
2063 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
2064 | { | |
2518c7c2 DM |
2065 | struct dst_entry *gc_list = NULL; |
2066 | int dir; | |
1da177e4 LT |
2067 | |
2068 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
2069 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
2070 | struct xfrm_policy *pol; | |
2071 | struct hlist_node *entry; | |
2072 | struct hlist_head *table; | |
2073 | int i; | |
4e81bb83 | 2074 | |
2518c7c2 DM |
2075 | hlist_for_each_entry(pol, entry, |
2076 | &xfrm_policy_inexact[dir], bydst) | |
2077 | prune_one_bundle(pol, func, &gc_list); | |
2078 | ||
2079 | table = xfrm_policy_bydst[dir].table; | |
2080 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
2081 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
2082 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
2083 | } |
2084 | } | |
2085 | read_unlock_bh(&xfrm_policy_lock); | |
2086 | ||
2087 | while (gc_list) { | |
2518c7c2 | 2088 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2089 | gc_list = dst->next; |
2090 | dst_free(dst); | |
2091 | } | |
2092 | } | |
2093 | ||
2094 | static int unused_bundle(struct dst_entry *dst) | |
2095 | { | |
2096 | return !atomic_read(&dst->__refcnt); | |
2097 | } | |
2098 | ||
2099 | static void __xfrm_garbage_collect(void) | |
2100 | { | |
2101 | xfrm_prune_bundles(unused_bundle); | |
2102 | } | |
2103 | ||
1c095399 | 2104 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
2105 | { |
2106 | xfrm_prune_bundles(stale_bundle); | |
2107 | return 0; | |
2108 | } | |
2109 | ||
25ee3286 | 2110 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2111 | { |
2112 | do { | |
2113 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2114 | u32 pmtu, route_mtu_cached; | |
2115 | ||
2116 | pmtu = dst_mtu(dst->child); | |
2117 | xdst->child_mtu_cached = pmtu; | |
2118 | ||
2119 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2120 | ||
2121 | route_mtu_cached = dst_mtu(xdst->route); | |
2122 | xdst->route_mtu_cached = route_mtu_cached; | |
2123 | ||
2124 | if (pmtu > route_mtu_cached) | |
2125 | pmtu = route_mtu_cached; | |
2126 | ||
2127 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2128 | } while ((dst = dst->next)); | |
2129 | } | |
2130 | ||
1da177e4 LT |
2131 | /* Check that the bundle accepts the flow and its components are |
2132 | * still valid. | |
2133 | */ | |
2134 | ||
5b368e61 VY |
2135 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2136 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2137 | { |
2138 | struct dst_entry *dst = &first->u.dst; | |
2139 | struct xfrm_dst *last; | |
2140 | u32 mtu; | |
2141 | ||
92d63dec | 2142 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2143 | (dst->dev && !netif_running(dst->dev))) |
2144 | return 0; | |
157bfc25 MN |
2145 | #ifdef CONFIG_XFRM_SUB_POLICY |
2146 | if (fl) { | |
2147 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2148 | return 0; | |
2149 | if (first->partner && | |
2150 | !xfrm_selector_match(first->partner, fl, family)) | |
2151 | return 0; | |
2152 | } | |
2153 | #endif | |
1da177e4 LT |
2154 | |
2155 | last = NULL; | |
2156 | ||
2157 | do { | |
2158 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2159 | ||
2160 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2161 | return 0; | |
67f83cbf VY |
2162 | if (fl && pol && |
2163 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2164 | return 0; |
1da177e4 LT |
2165 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2166 | return 0; | |
9d4a706d DM |
2167 | if (xdst->genid != dst->xfrm->genid) |
2168 | return 0; | |
e53820de | 2169 | |
1bfcb10f | 2170 | if (strict && fl && |
13996378 | 2171 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2172 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2173 | return 0; | |
1da177e4 LT |
2174 | |
2175 | mtu = dst_mtu(dst->child); | |
2176 | if (xdst->child_mtu_cached != mtu) { | |
2177 | last = xdst; | |
2178 | xdst->child_mtu_cached = mtu; | |
2179 | } | |
2180 | ||
92d63dec | 2181 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2182 | return 0; |
2183 | mtu = dst_mtu(xdst->route); | |
2184 | if (xdst->route_mtu_cached != mtu) { | |
2185 | last = xdst; | |
2186 | xdst->route_mtu_cached = mtu; | |
2187 | } | |
2188 | ||
2189 | dst = dst->child; | |
2190 | } while (dst->xfrm); | |
2191 | ||
2192 | if (likely(!last)) | |
2193 | return 1; | |
2194 | ||
2195 | mtu = last->child_mtu_cached; | |
2196 | for (;;) { | |
2197 | dst = &last->u.dst; | |
2198 | ||
2199 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2200 | if (mtu > last->route_mtu_cached) | |
2201 | mtu = last->route_mtu_cached; | |
2202 | dst->metrics[RTAX_MTU-1] = mtu; | |
2203 | ||
2204 | if (last == first) | |
2205 | break; | |
2206 | ||
bd0bf076 | 2207 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2208 | last->child_mtu_cached = mtu; |
2209 | } | |
2210 | ||
2211 | return 1; | |
2212 | } | |
2213 | ||
2214 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2215 | ||
1da177e4 LT |
2216 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2217 | { | |
2218 | int err = 0; | |
2219 | if (unlikely(afinfo == NULL)) | |
2220 | return -EINVAL; | |
2221 | if (unlikely(afinfo->family >= NPROTO)) | |
2222 | return -EAFNOSUPPORT; | |
e959d812 | 2223 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2224 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2225 | err = -ENOBUFS; | |
2226 | else { | |
2227 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2228 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2229 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2230 | if (likely(dst_ops->check == NULL)) | |
2231 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2232 | if (likely(dst_ops->negative_advice == NULL)) |
2233 | dst_ops->negative_advice = xfrm_negative_advice; | |
2234 | if (likely(dst_ops->link_failure == NULL)) | |
2235 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2236 | if (likely(afinfo->garbage_collect == NULL)) |
2237 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2238 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2239 | } | |
e959d812 | 2240 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2241 | return err; |
2242 | } | |
2243 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2244 | ||
2245 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2246 | { | |
2247 | int err = 0; | |
2248 | if (unlikely(afinfo == NULL)) | |
2249 | return -EINVAL; | |
2250 | if (unlikely(afinfo->family >= NPROTO)) | |
2251 | return -EAFNOSUPPORT; | |
e959d812 | 2252 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2253 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2254 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2255 | err = -EINVAL; | |
2256 | else { | |
2257 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2258 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2259 | dst_ops->kmem_cachep = NULL; | |
2260 | dst_ops->check = NULL; | |
1da177e4 LT |
2261 | dst_ops->negative_advice = NULL; |
2262 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2263 | afinfo->garbage_collect = NULL; |
2264 | } | |
2265 | } | |
e959d812 | 2266 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2267 | return err; |
2268 | } | |
2269 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2270 | ||
2271 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2272 | { | |
2273 | struct xfrm_policy_afinfo *afinfo; | |
2274 | if (unlikely(family >= NPROTO)) | |
2275 | return NULL; | |
2276 | read_lock(&xfrm_policy_afinfo_lock); | |
2277 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2278 | if (unlikely(!afinfo)) |
2279 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2280 | return afinfo; |
2281 | } | |
2282 | ||
2283 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2284 | { | |
546be240 HX |
2285 | read_unlock(&xfrm_policy_afinfo_lock); |
2286 | } | |
2287 | ||
1da177e4 LT |
2288 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2289 | { | |
e9dc8653 EB |
2290 | struct net_device *dev = ptr; |
2291 | ||
2292 | if (dev->nd_net != &init_net) | |
2293 | return NOTIFY_DONE; | |
2294 | ||
1da177e4 LT |
2295 | switch (event) { |
2296 | case NETDEV_DOWN: | |
2297 | xfrm_flush_bundles(); | |
2298 | } | |
2299 | return NOTIFY_DONE; | |
2300 | } | |
2301 | ||
2302 | static struct notifier_block xfrm_dev_notifier = { | |
2303 | xfrm_dev_event, | |
2304 | NULL, | |
2305 | 0 | |
2306 | }; | |
2307 | ||
558f82ef MN |
2308 | #ifdef CONFIG_XFRM_STATISTICS |
2309 | static int __init xfrm_statistics_init(void) | |
2310 | { | |
2311 | if (snmp_mib_init((void **)xfrm_statistics, | |
2312 | sizeof(struct linux_xfrm_mib)) < 0) | |
2313 | return -ENOMEM; | |
2314 | return 0; | |
2315 | } | |
2316 | #endif | |
2317 | ||
1da177e4 LT |
2318 | static void __init xfrm_policy_init(void) |
2319 | { | |
2518c7c2 DM |
2320 | unsigned int hmask, sz; |
2321 | int dir; | |
2322 | ||
1da177e4 LT |
2323 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
2324 | sizeof(struct xfrm_dst), | |
e5d679f3 | 2325 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2326 | NULL); |
1da177e4 | 2327 | |
2518c7c2 DM |
2328 | hmask = 8 - 1; |
2329 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2330 | ||
44e36b42 | 2331 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2332 | xfrm_idx_hmask = hmask; |
2333 | if (!xfrm_policy_byidx) | |
2334 | panic("XFRM: failed to allocate byidx hash\n"); | |
2335 | ||
2336 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2337 | struct xfrm_policy_hash *htab; | |
2338 | ||
2339 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); | |
2340 | ||
2341 | htab = &xfrm_policy_bydst[dir]; | |
44e36b42 | 2342 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2343 | htab->hmask = hmask; |
2344 | if (!htab->table) | |
2345 | panic("XFRM: failed to allocate bydst hash\n"); | |
2346 | } | |
2347 | ||
c4028958 | 2348 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
2349 | register_netdevice_notifier(&xfrm_dev_notifier); |
2350 | } | |
2351 | ||
2352 | void __init xfrm_init(void) | |
2353 | { | |
558f82ef MN |
2354 | #ifdef CONFIG_XFRM_STATISTICS |
2355 | xfrm_statistics_init(); | |
2356 | #endif | |
1da177e4 LT |
2357 | xfrm_state_init(); |
2358 | xfrm_policy_init(); | |
2359 | xfrm_input_init(); | |
558f82ef MN |
2360 | #ifdef CONFIG_XFRM_STATISTICS |
2361 | xfrm_proc_init(); | |
2362 | #endif | |
1da177e4 LT |
2363 | } |
2364 | ||
ab5f5e8b JL |
2365 | #ifdef CONFIG_AUDITSYSCALL |
2366 | static inline void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, | |
2367 | struct audit_buffer *audit_buf) | |
2368 | { | |
875179fa PM |
2369 | struct xfrm_sec_ctx *ctx = xp->security; |
2370 | struct xfrm_selector *sel = &xp->selector; | |
2371 | ||
2372 | if (ctx) | |
ab5f5e8b | 2373 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2374 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2375 | |
875179fa | 2376 | switch(sel->family) { |
ab5f5e8b | 2377 | case AF_INET: |
875179fa PM |
2378 | audit_log_format(audit_buf, " src=" NIPQUAD_FMT, |
2379 | NIPQUAD(sel->saddr.a4)); | |
2380 | if (sel->prefixlen_s != 32) | |
2381 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2382 | sel->prefixlen_s); | |
2383 | audit_log_format(audit_buf, " dst=" NIPQUAD_FMT, | |
2384 | NIPQUAD(sel->daddr.a4)); | |
2385 | if (sel->prefixlen_d != 32) | |
2386 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2387 | sel->prefixlen_d); | |
ab5f5e8b JL |
2388 | break; |
2389 | case AF_INET6: | |
875179fa PM |
2390 | audit_log_format(audit_buf, " src=" NIP6_FMT, |
2391 | NIP6(*(struct in6_addr *)sel->saddr.a6)); | |
2392 | if (sel->prefixlen_s != 128) | |
2393 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2394 | sel->prefixlen_s); | |
2395 | audit_log_format(audit_buf, " dst=" NIP6_FMT, | |
2396 | NIP6(*(struct in6_addr *)sel->daddr.a6)); | |
2397 | if (sel->prefixlen_d != 128) | |
2398 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2399 | sel->prefixlen_d); | |
ab5f5e8b JL |
2400 | break; |
2401 | } | |
2402 | } | |
2403 | ||
2404 | void | |
2405 | xfrm_audit_policy_add(struct xfrm_policy *xp, int result, u32 auid, u32 sid) | |
2406 | { | |
2407 | struct audit_buffer *audit_buf; | |
2408 | extern int audit_enabled; | |
2409 | ||
2410 | if (audit_enabled == 0) | |
2411 | return; | |
5951cab1 | 2412 | audit_buf = xfrm_audit_start(auid, sid); |
ab5f5e8b JL |
2413 | if (audit_buf == NULL) |
2414 | return; | |
2415 | audit_log_format(audit_buf, " op=SPD-add res=%u", result); | |
2416 | xfrm_audit_common_policyinfo(xp, audit_buf); | |
2417 | audit_log_end(audit_buf); | |
2418 | } | |
2419 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2420 | ||
2421 | void | |
2422 | xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, u32 auid, u32 sid) | |
2423 | { | |
2424 | struct audit_buffer *audit_buf; | |
2425 | extern int audit_enabled; | |
2426 | ||
2427 | if (audit_enabled == 0) | |
2428 | return; | |
5951cab1 | 2429 | audit_buf = xfrm_audit_start(auid, sid); |
ab5f5e8b JL |
2430 | if (audit_buf == NULL) |
2431 | return; | |
2432 | audit_log_format(audit_buf, " op=SPD-delete res=%u", result); | |
2433 | xfrm_audit_common_policyinfo(xp, audit_buf); | |
2434 | audit_log_end(audit_buf); | |
2435 | } | |
2436 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2437 | #endif | |
2438 | ||
80c9abaa SS |
2439 | #ifdef CONFIG_XFRM_MIGRATE |
2440 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2441 | struct xfrm_selector *sel_tgt) | |
2442 | { | |
2443 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2444 | if (sel_tgt->family == sel_cmp->family && | |
2445 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2446 | sel_cmp->family) == 0 && |
80c9abaa SS |
2447 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2448 | sel_cmp->family) == 0 && | |
2449 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2450 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2451 | return 1; | |
2452 | } | |
2453 | } else { | |
2454 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2455 | return 1; | |
2456 | } | |
2457 | } | |
2458 | return 0; | |
2459 | } | |
2460 | ||
2461 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2462 | u8 dir, u8 type) | |
2463 | { | |
2464 | struct xfrm_policy *pol, *ret = NULL; | |
2465 | struct hlist_node *entry; | |
2466 | struct hlist_head *chain; | |
2467 | u32 priority = ~0U; | |
2468 | ||
2469 | read_lock_bh(&xfrm_policy_lock); | |
2470 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); | |
2471 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2472 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2473 | pol->type == type) { | |
2474 | ret = pol; | |
2475 | priority = ret->priority; | |
2476 | break; | |
2477 | } | |
2478 | } | |
2479 | chain = &xfrm_policy_inexact[dir]; | |
2480 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2481 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2482 | pol->type == type && | |
2483 | pol->priority < priority) { | |
2484 | ret = pol; | |
2485 | break; | |
2486 | } | |
2487 | } | |
2488 | ||
2489 | if (ret) | |
2490 | xfrm_pol_hold(ret); | |
2491 | ||
2492 | read_unlock_bh(&xfrm_policy_lock); | |
2493 | ||
2494 | return ret; | |
2495 | } | |
2496 | ||
2497 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2498 | { | |
2499 | int match = 0; | |
2500 | ||
2501 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2502 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2503 | switch (t->mode) { | |
2504 | case XFRM_MODE_TUNNEL: | |
2505 | case XFRM_MODE_BEET: | |
2506 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2507 | m->old_family) == 0 && | |
2508 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2509 | m->old_family) == 0) { | |
2510 | match = 1; | |
2511 | } | |
2512 | break; | |
2513 | case XFRM_MODE_TRANSPORT: | |
2514 | /* in case of transport mode, template does not store | |
2515 | any IP addresses, hence we just compare mode and | |
2516 | protocol */ | |
2517 | match = 1; | |
2518 | break; | |
2519 | default: | |
2520 | break; | |
2521 | } | |
2522 | } | |
2523 | return match; | |
2524 | } | |
2525 | ||
2526 | /* update endpoint address(es) of template(s) */ | |
2527 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2528 | struct xfrm_migrate *m, int num_migrate) | |
2529 | { | |
2530 | struct xfrm_migrate *mp; | |
2531 | struct dst_entry *dst; | |
2532 | int i, j, n = 0; | |
2533 | ||
2534 | write_lock_bh(&pol->lock); | |
2535 | if (unlikely(pol->dead)) { | |
2536 | /* target policy has been deleted */ | |
2537 | write_unlock_bh(&pol->lock); | |
2538 | return -ENOENT; | |
2539 | } | |
2540 | ||
2541 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2542 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2543 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2544 | continue; | |
2545 | n++; | |
1bfcb10f HX |
2546 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2547 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2548 | continue; |
2549 | /* update endpoints */ | |
2550 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2551 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2552 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2553 | sizeof(pol->xfrm_vec[i].saddr)); | |
2554 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2555 | /* flush bundles */ | |
2556 | while ((dst = pol->bundles) != NULL) { | |
2557 | pol->bundles = dst->next; | |
2558 | dst_free(dst); | |
2559 | } | |
2560 | } | |
2561 | } | |
2562 | ||
2563 | write_unlock_bh(&pol->lock); | |
2564 | ||
2565 | if (!n) | |
2566 | return -ENODATA; | |
2567 | ||
2568 | return 0; | |
2569 | } | |
2570 | ||
2571 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2572 | { | |
2573 | int i, j; | |
2574 | ||
2575 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2576 | return -EINVAL; | |
2577 | ||
2578 | for (i = 0; i < num_migrate; i++) { | |
2579 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2580 | m[i].old_family) == 0) && | |
2581 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2582 | m[i].old_family) == 0)) | |
2583 | return -EINVAL; | |
2584 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2585 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2586 | return -EINVAL; | |
2587 | ||
2588 | /* check if there is any duplicated entry */ | |
2589 | for (j = i + 1; j < num_migrate; j++) { | |
2590 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2591 | sizeof(m[i].old_daddr)) && | |
2592 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2593 | sizeof(m[i].old_saddr)) && | |
2594 | m[i].proto == m[j].proto && | |
2595 | m[i].mode == m[j].mode && | |
2596 | m[i].reqid == m[j].reqid && | |
2597 | m[i].old_family == m[j].old_family) | |
2598 | return -EINVAL; | |
2599 | } | |
2600 | } | |
2601 | ||
2602 | return 0; | |
2603 | } | |
2604 | ||
2605 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
2606 | struct xfrm_migrate *m, int num_migrate) | |
2607 | { | |
2608 | int i, err, nx_cur = 0, nx_new = 0; | |
2609 | struct xfrm_policy *pol = NULL; | |
2610 | struct xfrm_state *x, *xc; | |
2611 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2612 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2613 | struct xfrm_migrate *mp; | |
2614 | ||
2615 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2616 | goto out; | |
2617 | ||
2618 | /* Stage 1 - find policy */ | |
2619 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2620 | err = -ENOENT; | |
2621 | goto out; | |
2622 | } | |
2623 | ||
2624 | /* Stage 2 - find and update state(s) */ | |
2625 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2626 | if ((x = xfrm_migrate_state_find(mp))) { | |
2627 | x_cur[nx_cur] = x; | |
2628 | nx_cur++; | |
2629 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2630 | x_new[nx_new] = xc; | |
2631 | nx_new++; | |
2632 | } else { | |
2633 | err = -ENODATA; | |
2634 | goto restore_state; | |
2635 | } | |
2636 | } | |
2637 | } | |
2638 | ||
2639 | /* Stage 3 - update policy */ | |
2640 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2641 | goto restore_state; | |
2642 | ||
2643 | /* Stage 4 - delete old state(s) */ | |
2644 | if (nx_cur) { | |
2645 | xfrm_states_put(x_cur, nx_cur); | |
2646 | xfrm_states_delete(x_cur, nx_cur); | |
2647 | } | |
2648 | ||
2649 | /* Stage 5 - announce */ | |
2650 | km_migrate(sel, dir, type, m, num_migrate); | |
2651 | ||
2652 | xfrm_pol_put(pol); | |
2653 | ||
2654 | return 0; | |
2655 | out: | |
2656 | return err; | |
2657 | ||
2658 | restore_state: | |
2659 | if (pol) | |
2660 | xfrm_pol_put(pol); | |
2661 | if (nx_cur) | |
2662 | xfrm_states_put(x_cur, nx_cur); | |
2663 | if (nx_new) | |
2664 | xfrm_states_delete(x_new, nx_new); | |
2665 | ||
2666 | return err; | |
2667 | } | |
e610e679 | 2668 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2669 | #endif |