Commit | Line | Data |
---|---|---|
a716c119 | 1 | /* |
1da177e4 LT |
2 | * xfrm_policy.c |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * Kazunori MIYAZAWA @USAGI | |
10 | * YOSHIFUJI Hideaki | |
11 | * Split up af-specific portion | |
12 | * Derek Atkins <derek@ihtfp.com> Add the post_input processor | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
66cdb3ca | 16 | #include <linux/err.h> |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/kmod.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/workqueue.h> | |
22 | #include <linux/notifier.h> | |
23 | #include <linux/netdevice.h> | |
eb9c7ebe | 24 | #include <linux/netfilter.h> |
1da177e4 | 25 | #include <linux/module.h> |
2518c7c2 | 26 | #include <linux/cache.h> |
68277acc | 27 | #include <linux/audit.h> |
25ee3286 | 28 | #include <net/dst.h> |
1da177e4 LT |
29 | #include <net/xfrm.h> |
30 | #include <net/ip.h> | |
558f82ef MN |
31 | #ifdef CONFIG_XFRM_STATISTICS |
32 | #include <net/snmp.h> | |
33 | #endif | |
1da177e4 | 34 | |
44e36b42 DM |
35 | #include "xfrm_hash.h" |
36 | ||
aad0e0b9 | 37 | int sysctl_xfrm_larval_drop __read_mostly; |
14e50e57 | 38 | |
558f82ef MN |
39 | #ifdef CONFIG_XFRM_STATISTICS |
40 | DEFINE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics) __read_mostly; | |
41 | EXPORT_SYMBOL(xfrm_statistics); | |
42 | #endif | |
43 | ||
4a3e2f71 AV |
44 | DEFINE_MUTEX(xfrm_cfg_mutex); |
45 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
1da177e4 LT |
46 | |
47 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
48 | ||
2518c7c2 DM |
49 | unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
50 | EXPORT_SYMBOL(xfrm_policy_count); | |
1da177e4 LT |
51 | |
52 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); | |
53 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
54 | ||
e18b890b | 55 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 LT |
56 | |
57 | static struct work_struct xfrm_policy_gc_work; | |
2518c7c2 | 58 | static HLIST_HEAD(xfrm_policy_gc_list); |
1da177e4 LT |
59 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); |
60 | ||
61 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
62 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
25ee3286 | 63 | static void xfrm_init_pmtu(struct dst_entry *dst); |
1da177e4 | 64 | |
77681021 AM |
65 | static inline int |
66 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
67 | { | |
68 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
69 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
70 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
71 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
72 | (fl->proto == sel->proto || !sel->proto) && | |
73 | (fl->oif == sel->ifindex || !sel->ifindex); | |
74 | } | |
75 | ||
76 | static inline int | |
77 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
78 | { | |
79 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
80 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
81 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
82 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
83 | (fl->proto == sel->proto || !sel->proto) && | |
84 | (fl->oif == sel->ifindex || !sel->ifindex); | |
85 | } | |
86 | ||
87 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
88 | unsigned short family) | |
89 | { | |
90 | switch (family) { | |
91 | case AF_INET: | |
92 | return __xfrm4_selector_match(sel, fl); | |
93 | case AF_INET6: | |
94 | return __xfrm6_selector_match(sel, fl); | |
95 | } | |
96 | return 0; | |
97 | } | |
98 | ||
25ee3286 HX |
99 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
100 | int family) | |
1da177e4 | 101 | { |
66cdb3ca HX |
102 | xfrm_address_t *saddr = &x->props.saddr; |
103 | xfrm_address_t *daddr = &x->id.daddr; | |
104 | struct xfrm_policy_afinfo *afinfo; | |
105 | struct dst_entry *dst; | |
106 | ||
107 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) | |
108 | saddr = x->coaddr; | |
109 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) | |
110 | daddr = x->coaddr; | |
1da177e4 | 111 | |
25ee3286 | 112 | afinfo = xfrm_policy_get_afinfo(family); |
1da177e4 | 113 | if (unlikely(afinfo == NULL)) |
66cdb3ca | 114 | return ERR_PTR(-EAFNOSUPPORT); |
1da177e4 | 115 | |
66cdb3ca | 116 | dst = afinfo->dst_lookup(tos, saddr, daddr); |
1da177e4 | 117 | xfrm_policy_put_afinfo(afinfo); |
66cdb3ca | 118 | return dst; |
1da177e4 | 119 | } |
1da177e4 | 120 | |
1da177e4 LT |
121 | static inline unsigned long make_jiffies(long secs) |
122 | { | |
123 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
124 | return MAX_SCHEDULE_TIMEOUT-1; | |
125 | else | |
a716c119 | 126 | return secs*HZ; |
1da177e4 LT |
127 | } |
128 | ||
129 | static void xfrm_policy_timer(unsigned long data) | |
130 | { | |
131 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 132 | unsigned long now = get_seconds(); |
1da177e4 LT |
133 | long next = LONG_MAX; |
134 | int warn = 0; | |
135 | int dir; | |
136 | ||
137 | read_lock(&xp->lock); | |
138 | ||
139 | if (xp->dead) | |
140 | goto out; | |
141 | ||
77d8d7a6 | 142 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
143 | |
144 | if (xp->lft.hard_add_expires_seconds) { | |
145 | long tmo = xp->lft.hard_add_expires_seconds + | |
146 | xp->curlft.add_time - now; | |
147 | if (tmo <= 0) | |
148 | goto expired; | |
149 | if (tmo < next) | |
150 | next = tmo; | |
151 | } | |
152 | if (xp->lft.hard_use_expires_seconds) { | |
153 | long tmo = xp->lft.hard_use_expires_seconds + | |
154 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
155 | if (tmo <= 0) | |
156 | goto expired; | |
157 | if (tmo < next) | |
158 | next = tmo; | |
159 | } | |
160 | if (xp->lft.soft_add_expires_seconds) { | |
161 | long tmo = xp->lft.soft_add_expires_seconds + | |
162 | xp->curlft.add_time - now; | |
163 | if (tmo <= 0) { | |
164 | warn = 1; | |
165 | tmo = XFRM_KM_TIMEOUT; | |
166 | } | |
167 | if (tmo < next) | |
168 | next = tmo; | |
169 | } | |
170 | if (xp->lft.soft_use_expires_seconds) { | |
171 | long tmo = xp->lft.soft_use_expires_seconds + | |
172 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
173 | if (tmo <= 0) { | |
174 | warn = 1; | |
175 | tmo = XFRM_KM_TIMEOUT; | |
176 | } | |
177 | if (tmo < next) | |
178 | next = tmo; | |
179 | } | |
180 | ||
181 | if (warn) | |
6c5c8ca7 | 182 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
183 | if (next != LONG_MAX && |
184 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
185 | xfrm_pol_hold(xp); | |
186 | ||
187 | out: | |
188 | read_unlock(&xp->lock); | |
189 | xfrm_pol_put(xp); | |
190 | return; | |
191 | ||
192 | expired: | |
193 | read_unlock(&xp->lock); | |
4666faab | 194 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 195 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
196 | xfrm_pol_put(xp); |
197 | } | |
198 | ||
199 | ||
200 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
201 | * SPD calls. | |
202 | */ | |
203 | ||
dd0fc66f | 204 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp) |
1da177e4 LT |
205 | { |
206 | struct xfrm_policy *policy; | |
207 | ||
0da974f4 | 208 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
209 | |
210 | if (policy) { | |
2518c7c2 DM |
211 | INIT_HLIST_NODE(&policy->bydst); |
212 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 213 | rwlock_init(&policy->lock); |
2518c7c2 | 214 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
215 | setup_timer(&policy->timer, xfrm_policy_timer, |
216 | (unsigned long)policy); | |
1da177e4 LT |
217 | } |
218 | return policy; | |
219 | } | |
220 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
221 | ||
222 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
223 | ||
224 | void __xfrm_policy_destroy(struct xfrm_policy *policy) | |
225 | { | |
09a62660 | 226 | BUG_ON(!policy->dead); |
1da177e4 | 227 | |
09a62660 | 228 | BUG_ON(policy->bundles); |
1da177e4 LT |
229 | |
230 | if (del_timer(&policy->timer)) | |
231 | BUG(); | |
232 | ||
df71837d | 233 | security_xfrm_policy_free(policy); |
1da177e4 LT |
234 | kfree(policy); |
235 | } | |
236 | EXPORT_SYMBOL(__xfrm_policy_destroy); | |
237 | ||
238 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
239 | { | |
240 | struct dst_entry *dst; | |
241 | ||
242 | while ((dst = policy->bundles) != NULL) { | |
243 | policy->bundles = dst->next; | |
244 | dst_free(dst); | |
245 | } | |
246 | ||
247 | if (del_timer(&policy->timer)) | |
248 | atomic_dec(&policy->refcnt); | |
249 | ||
250 | if (atomic_read(&policy->refcnt) > 1) | |
251 | flow_cache_flush(); | |
252 | ||
253 | xfrm_pol_put(policy); | |
254 | } | |
255 | ||
c4028958 | 256 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
257 | { |
258 | struct xfrm_policy *policy; | |
2518c7c2 DM |
259 | struct hlist_node *entry, *tmp; |
260 | struct hlist_head gc_list; | |
1da177e4 LT |
261 | |
262 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
263 | gc_list.first = xfrm_policy_gc_list.first; |
264 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
265 | spin_unlock_bh(&xfrm_policy_gc_lock); |
266 | ||
2518c7c2 | 267 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 268 | xfrm_policy_gc_kill(policy); |
1da177e4 LT |
269 | } |
270 | ||
271 | /* Rule must be locked. Release descentant resources, announce | |
272 | * entry dead. The rule must be unlinked from lists to the moment. | |
273 | */ | |
274 | ||
275 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
276 | { | |
277 | int dead; | |
278 | ||
279 | write_lock_bh(&policy->lock); | |
280 | dead = policy->dead; | |
281 | policy->dead = 1; | |
282 | write_unlock_bh(&policy->lock); | |
283 | ||
284 | if (unlikely(dead)) { | |
285 | WARN_ON(1); | |
286 | return; | |
287 | } | |
288 | ||
289 | spin_lock(&xfrm_policy_gc_lock); | |
2518c7c2 | 290 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
1da177e4 LT |
291 | spin_unlock(&xfrm_policy_gc_lock); |
292 | ||
293 | schedule_work(&xfrm_policy_gc_work); | |
294 | } | |
295 | ||
2518c7c2 DM |
296 | struct xfrm_policy_hash { |
297 | struct hlist_head *table; | |
298 | unsigned int hmask; | |
299 | }; | |
300 | ||
301 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; | |
302 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; | |
303 | static struct hlist_head *xfrm_policy_byidx __read_mostly; | |
304 | static unsigned int xfrm_idx_hmask __read_mostly; | |
305 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; | |
306 | ||
2518c7c2 DM |
307 | static inline unsigned int idx_hash(u32 index) |
308 | { | |
309 | return __idx_hash(index, xfrm_idx_hmask); | |
310 | } | |
311 | ||
2518c7c2 DM |
312 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
313 | { | |
314 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
315 | unsigned int hash = __sel_hash(sel, family, hmask); | |
316 | ||
317 | return (hash == hmask + 1 ? | |
318 | &xfrm_policy_inexact[dir] : | |
319 | xfrm_policy_bydst[dir].table + hash); | |
320 | } | |
321 | ||
322 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) | |
323 | { | |
324 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
325 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); | |
326 | ||
327 | return xfrm_policy_bydst[dir].table + hash; | |
328 | } | |
329 | ||
2518c7c2 DM |
330 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
331 | struct hlist_head *ndsttable, | |
332 | unsigned int nhashmask) | |
333 | { | |
334 | struct hlist_node *entry, *tmp; | |
335 | struct xfrm_policy *pol; | |
336 | ||
337 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { | |
338 | unsigned int h; | |
339 | ||
340 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
341 | pol->family, nhashmask); | |
342 | hlist_add_head(&pol->bydst, ndsttable+h); | |
343 | } | |
344 | } | |
345 | ||
346 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
347 | struct hlist_head *nidxtable, | |
348 | unsigned int nhashmask) | |
349 | { | |
350 | struct hlist_node *entry, *tmp; | |
351 | struct xfrm_policy *pol; | |
352 | ||
353 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
354 | unsigned int h; | |
355 | ||
356 | h = __idx_hash(pol->index, nhashmask); | |
357 | hlist_add_head(&pol->byidx, nidxtable+h); | |
358 | } | |
359 | } | |
360 | ||
361 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
362 | { | |
363 | return ((old_hmask + 1) << 1) - 1; | |
364 | } | |
365 | ||
366 | static void xfrm_bydst_resize(int dir) | |
367 | { | |
368 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
369 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
370 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
371 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; | |
44e36b42 | 372 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
373 | int i; |
374 | ||
375 | if (!ndst) | |
376 | return; | |
377 | ||
378 | write_lock_bh(&xfrm_policy_lock); | |
379 | ||
380 | for (i = hmask; i >= 0; i--) | |
381 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
382 | ||
383 | xfrm_policy_bydst[dir].table = ndst; | |
384 | xfrm_policy_bydst[dir].hmask = nhashmask; | |
385 | ||
386 | write_unlock_bh(&xfrm_policy_lock); | |
387 | ||
44e36b42 | 388 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
389 | } |
390 | ||
391 | static void xfrm_byidx_resize(int total) | |
392 | { | |
393 | unsigned int hmask = xfrm_idx_hmask; | |
394 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
395 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
396 | struct hlist_head *oidx = xfrm_policy_byidx; | |
44e36b42 | 397 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
398 | int i; |
399 | ||
400 | if (!nidx) | |
401 | return; | |
402 | ||
403 | write_lock_bh(&xfrm_policy_lock); | |
404 | ||
405 | for (i = hmask; i >= 0; i--) | |
406 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
407 | ||
408 | xfrm_policy_byidx = nidx; | |
409 | xfrm_idx_hmask = nhashmask; | |
410 | ||
411 | write_unlock_bh(&xfrm_policy_lock); | |
412 | ||
44e36b42 | 413 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
414 | } |
415 | ||
416 | static inline int xfrm_bydst_should_resize(int dir, int *total) | |
417 | { | |
418 | unsigned int cnt = xfrm_policy_count[dir]; | |
419 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
420 | ||
421 | if (total) | |
422 | *total += cnt; | |
423 | ||
424 | if ((hmask + 1) < xfrm_policy_hashmax && | |
425 | cnt > hmask) | |
426 | return 1; | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
431 | static inline int xfrm_byidx_should_resize(int total) | |
432 | { | |
433 | unsigned int hmask = xfrm_idx_hmask; | |
434 | ||
435 | if ((hmask + 1) < xfrm_policy_hashmax && | |
436 | total > hmask) | |
437 | return 1; | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
5a6d3416 | 442 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
443 | { |
444 | read_lock_bh(&xfrm_policy_lock); | |
445 | si->incnt = xfrm_policy_count[XFRM_POLICY_IN]; | |
446 | si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT]; | |
447 | si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD]; | |
448 | si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
449 | si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
450 | si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
451 | si->spdhcnt = xfrm_idx_hmask; | |
452 | si->spdhmcnt = xfrm_policy_hashmax; | |
453 | read_unlock_bh(&xfrm_policy_lock); | |
454 | } | |
455 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 456 | |
ecfd6b18 | 457 | static DEFINE_MUTEX(hash_resize_mutex); |
c4028958 | 458 | static void xfrm_hash_resize(struct work_struct *__unused) |
2518c7c2 DM |
459 | { |
460 | int dir, total; | |
461 | ||
462 | mutex_lock(&hash_resize_mutex); | |
463 | ||
464 | total = 0; | |
465 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
466 | if (xfrm_bydst_should_resize(dir, &total)) | |
467 | xfrm_bydst_resize(dir); | |
468 | } | |
469 | if (xfrm_byidx_should_resize(total)) | |
470 | xfrm_byidx_resize(total); | |
471 | ||
472 | mutex_unlock(&hash_resize_mutex); | |
473 | } | |
474 | ||
c4028958 | 475 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
2518c7c2 | 476 | |
1da177e4 LT |
477 | /* Generate new index... KAME seems to generate them ordered by cost |
478 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
4e81bb83 | 479 | static u32 xfrm_gen_index(u8 type, int dir) |
1da177e4 | 480 | { |
1da177e4 LT |
481 | static u32 idx_generator; |
482 | ||
483 | for (;;) { | |
2518c7c2 DM |
484 | struct hlist_node *entry; |
485 | struct hlist_head *list; | |
486 | struct xfrm_policy *p; | |
487 | u32 idx; | |
488 | int found; | |
489 | ||
1da177e4 LT |
490 | idx = (idx_generator | dir); |
491 | idx_generator += 8; | |
492 | if (idx == 0) | |
493 | idx = 8; | |
2518c7c2 DM |
494 | list = xfrm_policy_byidx + idx_hash(idx); |
495 | found = 0; | |
496 | hlist_for_each_entry(p, entry, list, byidx) { | |
497 | if (p->index == idx) { | |
498 | found = 1; | |
1da177e4 | 499 | break; |
2518c7c2 | 500 | } |
1da177e4 | 501 | } |
2518c7c2 | 502 | if (!found) |
1da177e4 LT |
503 | return idx; |
504 | } | |
505 | } | |
506 | ||
2518c7c2 DM |
507 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
508 | { | |
509 | u32 *p1 = (u32 *) s1; | |
510 | u32 *p2 = (u32 *) s2; | |
511 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
512 | int i; | |
513 | ||
514 | for (i = 0; i < len; i++) { | |
515 | if (p1[i] != p2[i]) | |
516 | return 1; | |
517 | } | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
1da177e4 LT |
522 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
523 | { | |
2518c7c2 DM |
524 | struct xfrm_policy *pol; |
525 | struct xfrm_policy *delpol; | |
526 | struct hlist_head *chain; | |
a6c7ab55 | 527 | struct hlist_node *entry, *newpos; |
9b78a82c | 528 | struct dst_entry *gc_list; |
1da177e4 LT |
529 | |
530 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
531 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
532 | delpol = NULL; | |
533 | newpos = NULL; | |
2518c7c2 | 534 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 535 | if (pol->type == policy->type && |
2518c7c2 | 536 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
537 | xfrm_sec_ctx_match(pol->security, policy->security) && |
538 | !WARN_ON(delpol)) { | |
1da177e4 LT |
539 | if (excl) { |
540 | write_unlock_bh(&xfrm_policy_lock); | |
541 | return -EEXIST; | |
542 | } | |
1da177e4 LT |
543 | delpol = pol; |
544 | if (policy->priority > pol->priority) | |
545 | continue; | |
546 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 547 | newpos = &pol->bydst; |
1da177e4 LT |
548 | continue; |
549 | } | |
1da177e4 LT |
550 | if (delpol) |
551 | break; | |
1da177e4 LT |
552 | } |
553 | if (newpos) | |
2518c7c2 DM |
554 | hlist_add_after(newpos, &policy->bydst); |
555 | else | |
556 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 557 | xfrm_pol_hold(policy); |
2518c7c2 | 558 | xfrm_policy_count[dir]++; |
1da177e4 | 559 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
560 | if (delpol) { |
561 | hlist_del(&delpol->bydst); | |
562 | hlist_del(&delpol->byidx); | |
563 | xfrm_policy_count[dir]--; | |
564 | } | |
4e81bb83 | 565 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
2518c7c2 | 566 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
9d729f72 | 567 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
568 | policy->curlft.use_time = 0; |
569 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
570 | xfrm_pol_hold(policy); | |
571 | write_unlock_bh(&xfrm_policy_lock); | |
572 | ||
9b78a82c | 573 | if (delpol) |
1da177e4 | 574 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
575 | else if (xfrm_bydst_should_resize(dir, NULL)) |
576 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
577 | |
578 | read_lock_bh(&xfrm_policy_lock); | |
579 | gc_list = NULL; | |
2518c7c2 DM |
580 | entry = &policy->bydst; |
581 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
582 | struct dst_entry *dst; |
583 | ||
584 | write_lock(&policy->lock); | |
585 | dst = policy->bundles; | |
586 | if (dst) { | |
587 | struct dst_entry *tail = dst; | |
588 | while (tail->next) | |
589 | tail = tail->next; | |
590 | tail->next = gc_list; | |
591 | gc_list = dst; | |
592 | ||
593 | policy->bundles = NULL; | |
594 | } | |
595 | write_unlock(&policy->lock); | |
1da177e4 | 596 | } |
9b78a82c DM |
597 | read_unlock_bh(&xfrm_policy_lock); |
598 | ||
599 | while (gc_list) { | |
600 | struct dst_entry *dst = gc_list; | |
601 | ||
602 | gc_list = dst->next; | |
603 | dst_free(dst); | |
604 | } | |
605 | ||
1da177e4 LT |
606 | return 0; |
607 | } | |
608 | EXPORT_SYMBOL(xfrm_policy_insert); | |
609 | ||
4e81bb83 MN |
610 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
611 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
612 | struct xfrm_sec_ctx *ctx, int delete, |
613 | int *err) | |
1da177e4 | 614 | { |
2518c7c2 DM |
615 | struct xfrm_policy *pol, *ret; |
616 | struct hlist_head *chain; | |
617 | struct hlist_node *entry; | |
1da177e4 | 618 | |
ef41aaa0 | 619 | *err = 0; |
1da177e4 | 620 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
621 | chain = policy_hash_bysel(sel, sel->family, dir); |
622 | ret = NULL; | |
623 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
624 | if (pol->type == type && | |
625 | !selector_cmp(sel, &pol->selector) && | |
626 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 627 | xfrm_pol_hold(pol); |
2518c7c2 | 628 | if (delete) { |
ef41aaa0 EP |
629 | *err = security_xfrm_policy_delete(pol); |
630 | if (*err) { | |
631 | write_unlock_bh(&xfrm_policy_lock); | |
632 | return pol; | |
633 | } | |
2518c7c2 DM |
634 | hlist_del(&pol->bydst); |
635 | hlist_del(&pol->byidx); | |
636 | xfrm_policy_count[dir]--; | |
637 | } | |
638 | ret = pol; | |
1da177e4 LT |
639 | break; |
640 | } | |
641 | } | |
642 | write_unlock_bh(&xfrm_policy_lock); | |
643 | ||
2518c7c2 | 644 | if (ret && delete) { |
1da177e4 | 645 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 646 | xfrm_policy_kill(ret); |
1da177e4 | 647 | } |
2518c7c2 | 648 | return ret; |
1da177e4 | 649 | } |
df71837d | 650 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 651 | |
ef41aaa0 EP |
652 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
653 | int *err) | |
1da177e4 | 654 | { |
2518c7c2 DM |
655 | struct xfrm_policy *pol, *ret; |
656 | struct hlist_head *chain; | |
657 | struct hlist_node *entry; | |
1da177e4 | 658 | |
b5505c6e HX |
659 | *err = -ENOENT; |
660 | if (xfrm_policy_id2dir(id) != dir) | |
661 | return NULL; | |
662 | ||
ef41aaa0 | 663 | *err = 0; |
1da177e4 | 664 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
665 | chain = xfrm_policy_byidx + idx_hash(id); |
666 | ret = NULL; | |
667 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
668 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 669 | xfrm_pol_hold(pol); |
2518c7c2 | 670 | if (delete) { |
ef41aaa0 EP |
671 | *err = security_xfrm_policy_delete(pol); |
672 | if (*err) { | |
673 | write_unlock_bh(&xfrm_policy_lock); | |
674 | return pol; | |
675 | } | |
2518c7c2 DM |
676 | hlist_del(&pol->bydst); |
677 | hlist_del(&pol->byidx); | |
678 | xfrm_policy_count[dir]--; | |
679 | } | |
680 | ret = pol; | |
1da177e4 LT |
681 | break; |
682 | } | |
683 | } | |
684 | write_unlock_bh(&xfrm_policy_lock); | |
685 | ||
2518c7c2 | 686 | if (ret && delete) { |
1da177e4 | 687 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 688 | xfrm_policy_kill(ret); |
1da177e4 | 689 | } |
2518c7c2 | 690 | return ret; |
1da177e4 LT |
691 | } |
692 | EXPORT_SYMBOL(xfrm_policy_byid); | |
693 | ||
4aa2e62c JL |
694 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
695 | static inline int | |
696 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
1da177e4 | 697 | { |
4aa2e62c JL |
698 | int dir, err = 0; |
699 | ||
700 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
701 | struct xfrm_policy *pol; | |
702 | struct hlist_node *entry; | |
703 | int i; | |
704 | ||
705 | hlist_for_each_entry(pol, entry, | |
706 | &xfrm_policy_inexact[dir], bydst) { | |
707 | if (pol->type != type) | |
708 | continue; | |
709 | err = security_xfrm_policy_delete(pol); | |
710 | if (err) { | |
ab5f5e8b JL |
711 | xfrm_audit_policy_delete(pol, 0, |
712 | audit_info->loginuid, | |
713 | audit_info->secid); | |
4aa2e62c JL |
714 | return err; |
715 | } | |
7dc12d6d | 716 | } |
4aa2e62c JL |
717 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
718 | hlist_for_each_entry(pol, entry, | |
719 | xfrm_policy_bydst[dir].table + i, | |
720 | bydst) { | |
721 | if (pol->type != type) | |
722 | continue; | |
723 | err = security_xfrm_policy_delete(pol); | |
724 | if (err) { | |
ab5f5e8b JL |
725 | xfrm_audit_policy_delete(pol, 0, |
726 | audit_info->loginuid, | |
727 | audit_info->secid); | |
4aa2e62c JL |
728 | return err; |
729 | } | |
730 | } | |
731 | } | |
732 | } | |
733 | return err; | |
734 | } | |
735 | #else | |
736 | static inline int | |
737 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
738 | { | |
739 | return 0; | |
740 | } | |
741 | #endif | |
742 | ||
743 | int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) | |
744 | { | |
745 | int dir, err = 0; | |
1da177e4 LT |
746 | |
747 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c JL |
748 | |
749 | err = xfrm_policy_flush_secctx_check(type, audit_info); | |
750 | if (err) | |
751 | goto out; | |
752 | ||
1da177e4 | 753 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
754 | struct xfrm_policy *pol; |
755 | struct hlist_node *entry; | |
ae8c0577 | 756 | int i, killed; |
2518c7c2 | 757 | |
ae8c0577 | 758 | killed = 0; |
2518c7c2 DM |
759 | again1: |
760 | hlist_for_each_entry(pol, entry, | |
761 | &xfrm_policy_inexact[dir], bydst) { | |
762 | if (pol->type != type) | |
763 | continue; | |
764 | hlist_del(&pol->bydst); | |
765 | hlist_del(&pol->byidx); | |
1da177e4 LT |
766 | write_unlock_bh(&xfrm_policy_lock); |
767 | ||
ab5f5e8b JL |
768 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
769 | audit_info->secid); | |
161a09e7 | 770 | |
2518c7c2 | 771 | xfrm_policy_kill(pol); |
ae8c0577 | 772 | killed++; |
1da177e4 LT |
773 | |
774 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
775 | goto again1; |
776 | } | |
777 | ||
778 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
779 | again2: | |
780 | hlist_for_each_entry(pol, entry, | |
781 | xfrm_policy_bydst[dir].table + i, | |
782 | bydst) { | |
783 | if (pol->type != type) | |
784 | continue; | |
785 | hlist_del(&pol->bydst); | |
786 | hlist_del(&pol->byidx); | |
787 | write_unlock_bh(&xfrm_policy_lock); | |
788 | ||
ab5f5e8b JL |
789 | xfrm_audit_policy_delete(pol, 1, |
790 | audit_info->loginuid, | |
791 | audit_info->secid); | |
2518c7c2 | 792 | xfrm_policy_kill(pol); |
ae8c0577 | 793 | killed++; |
2518c7c2 DM |
794 | |
795 | write_lock_bh(&xfrm_policy_lock); | |
796 | goto again2; | |
797 | } | |
1da177e4 | 798 | } |
2518c7c2 | 799 | |
ae8c0577 | 800 | xfrm_policy_count[dir] -= killed; |
1da177e4 LT |
801 | } |
802 | atomic_inc(&flow_cache_genid); | |
4aa2e62c | 803 | out: |
1da177e4 | 804 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 805 | return err; |
1da177e4 LT |
806 | } |
807 | EXPORT_SYMBOL(xfrm_policy_flush); | |
808 | ||
4e81bb83 | 809 | int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
810 | void *data) |
811 | { | |
baf5d743 | 812 | struct xfrm_policy *pol, *last = NULL; |
2518c7c2 | 813 | struct hlist_node *entry; |
baf5d743 | 814 | int dir, last_dir = 0, count, error; |
1da177e4 LT |
815 | |
816 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 | 817 | count = 0; |
1da177e4 LT |
818 | |
819 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
820 | struct hlist_head *table = xfrm_policy_bydst[dir].table; |
821 | int i; | |
822 | ||
823 | hlist_for_each_entry(pol, entry, | |
824 | &xfrm_policy_inexact[dir], bydst) { | |
825 | if (pol->type != type) | |
826 | continue; | |
baf5d743 JHS |
827 | if (last) { |
828 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
829 | count, data); | |
830 | if (error) | |
831 | goto out; | |
832 | } | |
833 | last = pol; | |
834 | last_dir = dir; | |
835 | count++; | |
1da177e4 | 836 | } |
2518c7c2 DM |
837 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
838 | hlist_for_each_entry(pol, entry, table + i, bydst) { | |
839 | if (pol->type != type) | |
840 | continue; | |
baf5d743 JHS |
841 | if (last) { |
842 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
843 | count, data); | |
844 | if (error) | |
845 | goto out; | |
846 | } | |
847 | last = pol; | |
848 | last_dir = dir; | |
849 | count++; | |
2518c7c2 DM |
850 | } |
851 | } | |
1da177e4 | 852 | } |
baf5d743 JHS |
853 | if (count == 0) { |
854 | error = -ENOENT; | |
855 | goto out; | |
856 | } | |
857 | error = func(last, last_dir % XFRM_POLICY_MAX, 0, data); | |
1da177e4 LT |
858 | out: |
859 | read_unlock_bh(&xfrm_policy_lock); | |
860 | return error; | |
861 | } | |
862 | EXPORT_SYMBOL(xfrm_policy_walk); | |
863 | ||
134b0fc5 JM |
864 | /* |
865 | * Find policy to apply to this flow. | |
866 | * | |
867 | * Returns 0 if policy found, else an -errno. | |
868 | */ | |
2518c7c2 DM |
869 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
870 | u8 type, u16 family, int dir) | |
1da177e4 | 871 | { |
2518c7c2 | 872 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 873 | int match, ret = -ESRCH; |
1da177e4 | 874 | |
2518c7c2 DM |
875 | if (pol->family != family || |
876 | pol->type != type) | |
134b0fc5 | 877 | return ret; |
1da177e4 | 878 | |
2518c7c2 | 879 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 JM |
880 | if (match) |
881 | ret = security_xfrm_policy_lookup(pol, fl->secid, dir); | |
2518c7c2 | 882 | |
134b0fc5 | 883 | return ret; |
2518c7c2 | 884 | } |
1da177e4 | 885 | |
2518c7c2 DM |
886 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
887 | u16 family, u8 dir) | |
888 | { | |
134b0fc5 | 889 | int err; |
2518c7c2 DM |
890 | struct xfrm_policy *pol, *ret; |
891 | xfrm_address_t *daddr, *saddr; | |
892 | struct hlist_node *entry; | |
893 | struct hlist_head *chain; | |
acba48e1 | 894 | u32 priority = ~0U; |
df71837d | 895 | |
2518c7c2 DM |
896 | daddr = xfrm_flowi_daddr(fl, family); |
897 | saddr = xfrm_flowi_saddr(fl, family); | |
898 | if (unlikely(!daddr || !saddr)) | |
899 | return NULL; | |
900 | ||
901 | read_lock_bh(&xfrm_policy_lock); | |
902 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
903 | ret = NULL; | |
904 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
905 | err = xfrm_policy_match(pol, fl, type, family, dir); |
906 | if (err) { | |
907 | if (err == -ESRCH) | |
908 | continue; | |
909 | else { | |
910 | ret = ERR_PTR(err); | |
911 | goto fail; | |
912 | } | |
913 | } else { | |
2518c7c2 | 914 | ret = pol; |
acba48e1 | 915 | priority = ret->priority; |
2518c7c2 DM |
916 | break; |
917 | } | |
918 | } | |
acba48e1 DM |
919 | chain = &xfrm_policy_inexact[dir]; |
920 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
921 | err = xfrm_policy_match(pol, fl, type, family, dir); |
922 | if (err) { | |
923 | if (err == -ESRCH) | |
924 | continue; | |
925 | else { | |
926 | ret = ERR_PTR(err); | |
927 | goto fail; | |
928 | } | |
929 | } else if (pol->priority < priority) { | |
acba48e1 DM |
930 | ret = pol; |
931 | break; | |
1da177e4 LT |
932 | } |
933 | } | |
acba48e1 DM |
934 | if (ret) |
935 | xfrm_pol_hold(ret); | |
134b0fc5 | 936 | fail: |
1da177e4 | 937 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 938 | |
2518c7c2 | 939 | return ret; |
4e81bb83 MN |
940 | } |
941 | ||
134b0fc5 | 942 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
943 | void **objp, atomic_t **obj_refp) |
944 | { | |
945 | struct xfrm_policy *pol; | |
134b0fc5 | 946 | int err = 0; |
4e81bb83 MN |
947 | |
948 | #ifdef CONFIG_XFRM_SUB_POLICY | |
949 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
950 | if (IS_ERR(pol)) { |
951 | err = PTR_ERR(pol); | |
952 | pol = NULL; | |
953 | } | |
954 | if (pol || err) | |
4e81bb83 MN |
955 | goto end; |
956 | #endif | |
957 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
958 | if (IS_ERR(pol)) { |
959 | err = PTR_ERR(pol); | |
960 | pol = NULL; | |
961 | } | |
4e81bb83 | 962 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 963 | end: |
4e81bb83 | 964 | #endif |
1da177e4 LT |
965 | if ((*objp = (void *) pol) != NULL) |
966 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 967 | return err; |
1da177e4 LT |
968 | } |
969 | ||
df71837d TJ |
970 | static inline int policy_to_flow_dir(int dir) |
971 | { | |
972 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
973 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
974 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
975 | return dir; | |
976 | switch (dir) { | |
977 | default: | |
978 | case XFRM_POLICY_IN: | |
979 | return FLOW_DIR_IN; | |
980 | case XFRM_POLICY_OUT: | |
981 | return FLOW_DIR_OUT; | |
982 | case XFRM_POLICY_FWD: | |
983 | return FLOW_DIR_FWD; | |
3ff50b79 | 984 | } |
df71837d TJ |
985 | } |
986 | ||
e0d1caa7 | 987 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
988 | { |
989 | struct xfrm_policy *pol; | |
990 | ||
991 | read_lock_bh(&xfrm_policy_lock); | |
992 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 993 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 994 | sk->sk_family); |
a716c119 | 995 | int err = 0; |
df71837d | 996 | |
3bccfbc7 VY |
997 | if (match) { |
998 | err = security_xfrm_policy_lookup(pol, fl->secid, | |
999 | policy_to_flow_dir(dir)); | |
1000 | if (!err) | |
1001 | xfrm_pol_hold(pol); | |
1002 | else if (err == -ESRCH) | |
1003 | pol = NULL; | |
1004 | else | |
1005 | pol = ERR_PTR(err); | |
1006 | } else | |
1da177e4 LT |
1007 | pol = NULL; |
1008 | } | |
1009 | read_unlock_bh(&xfrm_policy_lock); | |
1010 | return pol; | |
1011 | } | |
1012 | ||
1013 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1014 | { | |
2518c7c2 DM |
1015 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1016 | pol->family, dir); | |
4e81bb83 | 1017 | |
2518c7c2 DM |
1018 | hlist_add_head(&pol->bydst, chain); |
1019 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); | |
1020 | xfrm_policy_count[dir]++; | |
1da177e4 | 1021 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1022 | |
1023 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1024 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1025 | } |
1026 | ||
1027 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1028 | int dir) | |
1029 | { | |
2518c7c2 DM |
1030 | if (hlist_unhashed(&pol->bydst)) |
1031 | return NULL; | |
1da177e4 | 1032 | |
2518c7c2 DM |
1033 | hlist_del(&pol->bydst); |
1034 | hlist_del(&pol->byidx); | |
1035 | xfrm_policy_count[dir]--; | |
1036 | ||
1037 | return pol; | |
1da177e4 LT |
1038 | } |
1039 | ||
4666faab | 1040 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1041 | { |
1042 | write_lock_bh(&xfrm_policy_lock); | |
1043 | pol = __xfrm_policy_unlink(pol, dir); | |
1044 | write_unlock_bh(&xfrm_policy_lock); | |
1045 | if (pol) { | |
1046 | if (dir < XFRM_POLICY_MAX) | |
1047 | atomic_inc(&flow_cache_genid); | |
1048 | xfrm_policy_kill(pol); | |
4666faab | 1049 | return 0; |
1da177e4 | 1050 | } |
4666faab | 1051 | return -ENOENT; |
1da177e4 | 1052 | } |
a70fcb0b | 1053 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1054 | |
1055 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1056 | { | |
1057 | struct xfrm_policy *old_pol; | |
1058 | ||
4e81bb83 MN |
1059 | #ifdef CONFIG_XFRM_SUB_POLICY |
1060 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1061 | return -EINVAL; | |
1062 | #endif | |
1063 | ||
1da177e4 LT |
1064 | write_lock_bh(&xfrm_policy_lock); |
1065 | old_pol = sk->sk_policy[dir]; | |
1066 | sk->sk_policy[dir] = pol; | |
1067 | if (pol) { | |
9d729f72 | 1068 | pol->curlft.add_time = get_seconds(); |
4e81bb83 | 1069 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1070 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1071 | } | |
1072 | if (old_pol) | |
1073 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1074 | write_unlock_bh(&xfrm_policy_lock); | |
1075 | ||
1076 | if (old_pol) { | |
1077 | xfrm_policy_kill(old_pol); | |
1078 | } | |
1079 | return 0; | |
1080 | } | |
1081 | ||
1082 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1083 | { | |
1084 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
1085 | ||
1086 | if (newp) { | |
1087 | newp->selector = old->selector; | |
df71837d TJ |
1088 | if (security_xfrm_policy_clone(old, newp)) { |
1089 | kfree(newp); | |
1090 | return NULL; /* ENOMEM */ | |
1091 | } | |
1da177e4 LT |
1092 | newp->lft = old->lft; |
1093 | newp->curlft = old->curlft; | |
1094 | newp->action = old->action; | |
1095 | newp->flags = old->flags; | |
1096 | newp->xfrm_nr = old->xfrm_nr; | |
1097 | newp->index = old->index; | |
4e81bb83 | 1098 | newp->type = old->type; |
1da177e4 LT |
1099 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1100 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1101 | write_lock_bh(&xfrm_policy_lock); | |
1102 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1103 | write_unlock_bh(&xfrm_policy_lock); | |
1104 | xfrm_pol_put(newp); | |
1105 | } | |
1106 | return newp; | |
1107 | } | |
1108 | ||
1109 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1110 | { | |
1111 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1112 | *p1 = sk->sk_policy[1]; | |
1113 | ||
1114 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1115 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1116 | return -ENOMEM; | |
1117 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1118 | return -ENOMEM; | |
1119 | return 0; | |
1120 | } | |
1121 | ||
a1e59abf PM |
1122 | static int |
1123 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1124 | unsigned short family) | |
1125 | { | |
1126 | int err; | |
1127 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1128 | ||
1129 | if (unlikely(afinfo == NULL)) | |
1130 | return -EINVAL; | |
1131 | err = afinfo->get_saddr(local, remote); | |
1132 | xfrm_policy_put_afinfo(afinfo); | |
1133 | return err; | |
1134 | } | |
1135 | ||
1da177e4 LT |
1136 | /* Resolve list of templates for the flow, given policy. */ |
1137 | ||
1138 | static int | |
4e81bb83 MN |
1139 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1140 | struct xfrm_state **xfrm, | |
1141 | unsigned short family) | |
1da177e4 LT |
1142 | { |
1143 | int nx; | |
1144 | int i, error; | |
1145 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1146 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1147 | xfrm_address_t tmp; |
1da177e4 LT |
1148 | |
1149 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1150 | struct xfrm_state *x; | |
1151 | xfrm_address_t *remote = daddr; | |
1152 | xfrm_address_t *local = saddr; | |
1153 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1154 | ||
48b8d783 JK |
1155 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1156 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1157 | remote = &tmpl->id.daddr; |
1158 | local = &tmpl->saddr; | |
76b3f055 | 1159 | family = tmpl->encap_family; |
a1e59abf PM |
1160 | if (xfrm_addr_any(local, family)) { |
1161 | error = xfrm_get_saddr(&tmp, remote, family); | |
1162 | if (error) | |
1163 | goto fail; | |
1164 | local = &tmp; | |
1165 | } | |
1da177e4 LT |
1166 | } |
1167 | ||
1168 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1169 | ||
1170 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1171 | xfrm[nx++] = x; | |
1172 | daddr = remote; | |
1173 | saddr = local; | |
1174 | continue; | |
1175 | } | |
1176 | if (x) { | |
1177 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1178 | -EINVAL : -EAGAIN); | |
1179 | xfrm_state_put(x); | |
1180 | } | |
1181 | ||
1182 | if (!tmpl->optional) | |
1183 | goto fail; | |
1184 | } | |
1185 | return nx; | |
1186 | ||
1187 | fail: | |
1188 | for (nx--; nx>=0; nx--) | |
1189 | xfrm_state_put(xfrm[nx]); | |
1190 | return error; | |
1191 | } | |
1192 | ||
4e81bb83 MN |
1193 | static int |
1194 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1195 | struct xfrm_state **xfrm, | |
1196 | unsigned short family) | |
1197 | { | |
41a49cc3 MN |
1198 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1199 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1200 | int cnx = 0; |
1201 | int error; | |
1202 | int ret; | |
1203 | int i; | |
1204 | ||
1205 | for (i = 0; i < npols; i++) { | |
1206 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1207 | error = -ENOBUFS; | |
1208 | goto fail; | |
1209 | } | |
41a49cc3 MN |
1210 | |
1211 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1212 | if (ret < 0) { |
1213 | error = ret; | |
1214 | goto fail; | |
1215 | } else | |
1216 | cnx += ret; | |
1217 | } | |
1218 | ||
41a49cc3 MN |
1219 | /* found states are sorted for outbound processing */ |
1220 | if (npols > 1) | |
1221 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1222 | ||
4e81bb83 MN |
1223 | return cnx; |
1224 | ||
1225 | fail: | |
1226 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1227 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1228 | return error; |
1229 | ||
1230 | } | |
1231 | ||
1da177e4 LT |
1232 | /* Check that the bundle accepts the flow and its components are |
1233 | * still valid. | |
1234 | */ | |
1235 | ||
1236 | static struct dst_entry * | |
1237 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1238 | { | |
1239 | struct dst_entry *x; | |
1240 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1241 | if (unlikely(afinfo == NULL)) | |
1242 | return ERR_PTR(-EINVAL); | |
1243 | x = afinfo->find_bundle(fl, policy); | |
1244 | xfrm_policy_put_afinfo(afinfo); | |
1245 | return x; | |
1246 | } | |
1247 | ||
25ee3286 HX |
1248 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
1249 | { | |
1250 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1251 | int tos; | |
1da177e4 | 1252 | |
25ee3286 HX |
1253 | if (!afinfo) |
1254 | return -EINVAL; | |
1255 | ||
1256 | tos = afinfo->get_tos(fl); | |
1257 | ||
1258 | xfrm_policy_put_afinfo(afinfo); | |
1259 | ||
1260 | return tos; | |
1261 | } | |
1262 | ||
1263 | static inline struct xfrm_dst *xfrm_alloc_dst(int family) | |
1da177e4 | 1264 | { |
1da177e4 | 1265 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
25ee3286 HX |
1266 | struct xfrm_dst *xdst; |
1267 | ||
1268 | if (!afinfo) | |
1269 | return ERR_PTR(-EINVAL); | |
1270 | ||
1271 | xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS); | |
1272 | ||
1273 | xfrm_policy_put_afinfo(afinfo); | |
1274 | ||
1275 | return xdst; | |
1276 | } | |
1277 | ||
a1b05140 MN |
1278 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1279 | int nfheader_len) | |
1280 | { | |
1281 | struct xfrm_policy_afinfo *afinfo = | |
1282 | xfrm_policy_get_afinfo(dst->ops->family); | |
1283 | int err; | |
1284 | ||
1285 | if (!afinfo) | |
1286 | return -EINVAL; | |
1287 | ||
1288 | err = afinfo->init_path(path, dst, nfheader_len); | |
1289 | ||
1290 | xfrm_policy_put_afinfo(afinfo); | |
1291 | ||
1292 | return err; | |
1293 | } | |
1294 | ||
25ee3286 HX |
1295 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) |
1296 | { | |
1297 | struct xfrm_policy_afinfo *afinfo = | |
1298 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1299 | int err; | |
1300 | ||
1301 | if (!afinfo) | |
1da177e4 | 1302 | return -EINVAL; |
25ee3286 HX |
1303 | |
1304 | err = afinfo->fill_dst(xdst, dev); | |
1305 | ||
1da177e4 | 1306 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1307 | |
1da177e4 LT |
1308 | return err; |
1309 | } | |
1310 | ||
25ee3286 HX |
1311 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1312 | * all the metrics... Shortly, bundle a bundle. | |
1313 | */ | |
1314 | ||
1315 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1316 | struct xfrm_state **xfrm, int nx, | |
1317 | struct flowi *fl, | |
1318 | struct dst_entry *dst) | |
1319 | { | |
1320 | unsigned long now = jiffies; | |
1321 | struct net_device *dev; | |
1322 | struct dst_entry *dst_prev = NULL; | |
1323 | struct dst_entry *dst0 = NULL; | |
1324 | int i = 0; | |
1325 | int err; | |
1326 | int header_len = 0; | |
a1b05140 | 1327 | int nfheader_len = 0; |
25ee3286 HX |
1328 | int trailer_len = 0; |
1329 | int tos; | |
1330 | int family = policy->selector.family; | |
1331 | ||
1332 | tos = xfrm_get_tos(fl, family); | |
1333 | err = tos; | |
1334 | if (tos < 0) | |
1335 | goto put_states; | |
1336 | ||
1337 | dst_hold(dst); | |
1338 | ||
1339 | for (; i < nx; i++) { | |
1340 | struct xfrm_dst *xdst = xfrm_alloc_dst(family); | |
1341 | struct dst_entry *dst1 = &xdst->u.dst; | |
1342 | ||
1343 | err = PTR_ERR(xdst); | |
1344 | if (IS_ERR(xdst)) { | |
1345 | dst_release(dst); | |
1346 | goto put_states; | |
1347 | } | |
1348 | ||
1349 | if (!dst_prev) | |
1350 | dst0 = dst1; | |
1351 | else { | |
1352 | dst_prev->child = dst_clone(dst1); | |
1353 | dst1->flags |= DST_NOHASH; | |
1354 | } | |
1355 | ||
1356 | xdst->route = dst; | |
1357 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); | |
1358 | ||
1359 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1360 | family = xfrm[i]->props.family; | |
1361 | dst = xfrm_dst_lookup(xfrm[i], tos, family); | |
1362 | err = PTR_ERR(dst); | |
1363 | if (IS_ERR(dst)) | |
1364 | goto put_states; | |
1365 | } else | |
1366 | dst_hold(dst); | |
1367 | ||
1368 | dst1->xfrm = xfrm[i]; | |
1369 | xdst->genid = xfrm[i]->genid; | |
1370 | ||
1371 | dst1->obsolete = -1; | |
1372 | dst1->flags |= DST_HOST; | |
1373 | dst1->lastuse = now; | |
1374 | ||
1375 | dst1->input = dst_discard; | |
1376 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1377 | ||
1378 | dst1->next = dst_prev; | |
1379 | dst_prev = dst1; | |
1380 | ||
1381 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1382 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1383 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1384 | trailer_len += xfrm[i]->props.trailer_len; |
1385 | } | |
1386 | ||
1387 | dst_prev->child = dst; | |
1388 | dst0->path = dst; | |
1389 | ||
1390 | err = -ENODEV; | |
1391 | dev = dst->dev; | |
1392 | if (!dev) | |
1393 | goto free_dst; | |
1394 | ||
1395 | /* Copy neighbout for reachability confirmation */ | |
1396 | dst0->neighbour = neigh_clone(dst->neighbour); | |
1397 | ||
a1b05140 | 1398 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1399 | xfrm_init_pmtu(dst_prev); |
1400 | ||
1401 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1402 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1403 | ||
1404 | err = xfrm_fill_dst(xdst, dev); | |
1405 | if (err) | |
1406 | goto free_dst; | |
1407 | ||
1408 | dst_prev->header_len = header_len; | |
1409 | dst_prev->trailer_len = trailer_len; | |
1410 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1411 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1412 | } | |
1413 | ||
1414 | out: | |
1415 | return dst0; | |
1416 | ||
1417 | put_states: | |
1418 | for (; i < nx; i++) | |
1419 | xfrm_state_put(xfrm[i]); | |
1420 | free_dst: | |
1421 | if (dst0) | |
1422 | dst_free(dst0); | |
1423 | dst0 = ERR_PTR(err); | |
1424 | goto out; | |
1425 | } | |
1426 | ||
157bfc25 MN |
1427 | static int inline |
1428 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1429 | { | |
1430 | if (!*target) { | |
1431 | *target = kmalloc(size, GFP_ATOMIC); | |
1432 | if (!*target) | |
1433 | return -ENOMEM; | |
1434 | } | |
1435 | memcpy(*target, src, size); | |
1436 | return 0; | |
1437 | } | |
1438 | ||
1439 | static int inline | |
1440 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1441 | { | |
1442 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1443 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1444 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1445 | sel, sizeof(*sel)); | |
1446 | #else | |
1447 | return 0; | |
1448 | #endif | |
1449 | } | |
1450 | ||
1451 | static int inline | |
1452 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1453 | { | |
1454 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1455 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1456 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1457 | #else | |
1458 | return 0; | |
1459 | #endif | |
1460 | } | |
1da177e4 LT |
1461 | |
1462 | static int stale_bundle(struct dst_entry *dst); | |
1463 | ||
1464 | /* Main function: finds/creates a bundle for given flow. | |
1465 | * | |
1466 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1467 | * on interfaces with disabled IPsec. | |
1468 | */ | |
14e50e57 DM |
1469 | int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
1470 | struct sock *sk, int flags) | |
1da177e4 LT |
1471 | { |
1472 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1473 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1474 | int npols; | |
1475 | int pol_dead; | |
1476 | int xfrm_nr; | |
1477 | int pi; | |
1da177e4 LT |
1478 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1479 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1480 | int nx = 0; | |
1481 | int err; | |
1482 | u32 genid; | |
42cf93cd | 1483 | u16 family; |
df71837d | 1484 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1485 | |
1da177e4 LT |
1486 | restart: |
1487 | genid = atomic_read(&flow_cache_genid); | |
1488 | policy = NULL; | |
4e81bb83 MN |
1489 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1490 | pols[pi] = NULL; | |
1491 | npols = 0; | |
1492 | pol_dead = 0; | |
1493 | xfrm_nr = 0; | |
1494 | ||
f7944fb1 | 1495 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
e0d1caa7 | 1496 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
75b8c133 | 1497 | err = PTR_ERR(policy); |
0aa64774 MN |
1498 | if (IS_ERR(policy)) { |
1499 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); | |
75b8c133 | 1500 | goto dropdst; |
0aa64774 | 1501 | } |
3bccfbc7 | 1502 | } |
1da177e4 LT |
1503 | |
1504 | if (!policy) { | |
1505 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1506 | if ((dst_orig->flags & DST_NOXFRM) || |
1507 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
8b7817f3 | 1508 | goto nopol; |
1da177e4 | 1509 | |
e0d1caa7 | 1510 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1511 | dir, xfrm_policy_lookup); |
75b8c133 | 1512 | err = PTR_ERR(policy); |
d66e37a9 MN |
1513 | if (IS_ERR(policy)) { |
1514 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); | |
75b8c133 | 1515 | goto dropdst; |
d66e37a9 | 1516 | } |
1da177e4 LT |
1517 | } |
1518 | ||
1519 | if (!policy) | |
8b7817f3 | 1520 | goto nopol; |
1da177e4 | 1521 | |
42cf93cd | 1522 | family = dst_orig->ops->family; |
4e81bb83 MN |
1523 | pols[0] = policy; |
1524 | npols ++; | |
1525 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 | 1526 | |
aef21785 | 1527 | err = -ENOENT; |
8b7817f3 HX |
1528 | if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP)) |
1529 | goto error; | |
1530 | ||
1531 | policy->curlft.use_time = get_seconds(); | |
1532 | ||
1da177e4 | 1533 | switch (policy->action) { |
5e5234ff | 1534 | default: |
1da177e4 LT |
1535 | case XFRM_POLICY_BLOCK: |
1536 | /* Prohibit the flow */ | |
0aa64774 | 1537 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1538 | err = -EPERM; |
1539 | goto error; | |
1da177e4 LT |
1540 | |
1541 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1542 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1543 | if (policy->xfrm_nr == 0) { |
1544 | /* Flow passes not transformed. */ | |
1545 | xfrm_pol_put(policy); | |
1546 | return 0; | |
1547 | } | |
4e81bb83 | 1548 | #endif |
1da177e4 LT |
1549 | |
1550 | /* Try to find matching bundle. | |
1551 | * | |
1552 | * LATER: help from flow cache. It is optional, this | |
1553 | * is required only for output policy. | |
1554 | */ | |
1555 | dst = xfrm_find_bundle(fl, policy, family); | |
1556 | if (IS_ERR(dst)) { | |
0aa64774 | 1557 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
e104411b PM |
1558 | err = PTR_ERR(dst); |
1559 | goto error; | |
1da177e4 LT |
1560 | } |
1561 | ||
1562 | if (dst) | |
1563 | break; | |
1564 | ||
4e81bb83 MN |
1565 | #ifdef CONFIG_XFRM_SUB_POLICY |
1566 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1567 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1568 | fl, family, | |
1569 | XFRM_POLICY_OUT); | |
1570 | if (pols[1]) { | |
134b0fc5 | 1571 | if (IS_ERR(pols[1])) { |
0aa64774 | 1572 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR); |
134b0fc5 JM |
1573 | err = PTR_ERR(pols[1]); |
1574 | goto error; | |
1575 | } | |
4e81bb83 | 1576 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
0aa64774 | 1577 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK); |
4e81bb83 MN |
1578 | err = -EPERM; |
1579 | goto error; | |
1580 | } | |
1581 | npols ++; | |
1582 | xfrm_nr += pols[1]->xfrm_nr; | |
1583 | } | |
1584 | } | |
1585 | ||
1586 | /* | |
1587 | * Because neither flowi nor bundle information knows about | |
1588 | * transformation template size. On more than one policy usage | |
1589 | * we can realize whether all of them is bypass or not after | |
1590 | * they are searched. See above not-transformed bypass | |
1591 | * is surrounded by non-sub policy configuration, too. | |
1592 | */ | |
1593 | if (xfrm_nr == 0) { | |
1594 | /* Flow passes not transformed. */ | |
1595 | xfrm_pols_put(pols, npols); | |
1596 | return 0; | |
1597 | } | |
1598 | ||
1599 | #endif | |
1600 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1601 | |
1602 | if (unlikely(nx<0)) { | |
1603 | err = nx; | |
14e50e57 DM |
1604 | if (err == -EAGAIN && sysctl_xfrm_larval_drop) { |
1605 | /* EREMOTE tells the caller to generate | |
1606 | * a one-shot blackhole route. | |
1607 | */ | |
d66e37a9 | 1608 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
14e50e57 DM |
1609 | xfrm_pol_put(policy); |
1610 | return -EREMOTE; | |
1611 | } | |
815f4e57 | 1612 | if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) { |
1da177e4 LT |
1613 | DECLARE_WAITQUEUE(wait, current); |
1614 | ||
1615 | add_wait_queue(&km_waitq, &wait); | |
1616 | set_current_state(TASK_INTERRUPTIBLE); | |
1617 | schedule(); | |
1618 | set_current_state(TASK_RUNNING); | |
1619 | remove_wait_queue(&km_waitq, &wait); | |
1620 | ||
4e81bb83 | 1621 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1622 | |
1623 | if (nx == -EAGAIN && signal_pending(current)) { | |
0aa64774 | 1624 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 LT |
1625 | err = -ERESTART; |
1626 | goto error; | |
1627 | } | |
1628 | if (nx == -EAGAIN || | |
1629 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1630 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1631 | goto restart; |
1632 | } | |
1633 | err = nx; | |
1634 | } | |
0aa64774 MN |
1635 | if (err < 0) { |
1636 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES); | |
1da177e4 | 1637 | goto error; |
0aa64774 | 1638 | } |
1da177e4 LT |
1639 | } |
1640 | if (nx == 0) { | |
1641 | /* Flow passes not transformed. */ | |
4e81bb83 | 1642 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1643 | return 0; |
1644 | } | |
1645 | ||
25ee3286 HX |
1646 | dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); |
1647 | err = PTR_ERR(dst); | |
0aa64774 MN |
1648 | if (IS_ERR(dst)) { |
1649 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1da177e4 | 1650 | goto error; |
0aa64774 | 1651 | } |
1da177e4 | 1652 | |
4e81bb83 MN |
1653 | for (pi = 0; pi < npols; pi++) { |
1654 | read_lock_bh(&pols[pi]->lock); | |
1655 | pol_dead |= pols[pi]->dead; | |
1656 | read_unlock_bh(&pols[pi]->lock); | |
1657 | } | |
1658 | ||
1da177e4 | 1659 | write_lock_bh(&policy->lock); |
4e81bb83 | 1660 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1661 | /* Wow! While we worked on resolving, this |
1662 | * policy has gone. Retry. It is not paranoia, | |
1663 | * we just cannot enlist new bundle to dead object. | |
1664 | * We can't enlist stable bundles either. | |
1665 | */ | |
1666 | write_unlock_bh(&policy->lock); | |
1da177e4 LT |
1667 | if (dst) |
1668 | dst_free(dst); | |
00de651d | 1669 | |
0aa64774 MN |
1670 | if (pol_dead) |
1671 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD); | |
1672 | else | |
1673 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
00de651d HX |
1674 | err = -EHOSTUNREACH; |
1675 | goto error; | |
1da177e4 | 1676 | } |
157bfc25 MN |
1677 | |
1678 | if (npols > 1) | |
1679 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1680 | else | |
1681 | err = xfrm_dst_update_origin(dst, fl); | |
1682 | if (unlikely(err)) { | |
1683 | write_unlock_bh(&policy->lock); | |
1684 | if (dst) | |
1685 | dst_free(dst); | |
0aa64774 | 1686 | XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
157bfc25 MN |
1687 | goto error; |
1688 | } | |
1689 | ||
1da177e4 LT |
1690 | dst->next = policy->bundles; |
1691 | policy->bundles = dst; | |
1692 | dst_hold(dst); | |
1693 | write_unlock_bh(&policy->lock); | |
1694 | } | |
1695 | *dst_p = dst; | |
1696 | dst_release(dst_orig); | |
a716c119 | 1697 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1698 | return 0; |
1699 | ||
1700 | error: | |
4e81bb83 | 1701 | xfrm_pols_put(pols, npols); |
75b8c133 HX |
1702 | dropdst: |
1703 | dst_release(dst_orig); | |
1da177e4 LT |
1704 | *dst_p = NULL; |
1705 | return err; | |
8b7817f3 HX |
1706 | |
1707 | nopol: | |
aef21785 | 1708 | err = -ENOENT; |
8b7817f3 HX |
1709 | if (flags & XFRM_LOOKUP_ICMP) |
1710 | goto dropdst; | |
1711 | return 0; | |
1da177e4 | 1712 | } |
14e50e57 DM |
1713 | EXPORT_SYMBOL(__xfrm_lookup); |
1714 | ||
1715 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1716 | struct sock *sk, int flags) | |
1717 | { | |
1718 | int err = __xfrm_lookup(dst_p, fl, sk, flags); | |
1719 | ||
1720 | if (err == -EREMOTE) { | |
1721 | dst_release(*dst_p); | |
1722 | *dst_p = NULL; | |
1723 | err = -EAGAIN; | |
1724 | } | |
1725 | ||
1726 | return err; | |
1727 | } | |
1da177e4 LT |
1728 | EXPORT_SYMBOL(xfrm_lookup); |
1729 | ||
df0ba92a MN |
1730 | static inline int |
1731 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1732 | { | |
1733 | struct xfrm_state *x; | |
df0ba92a MN |
1734 | |
1735 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1736 | return 0; | |
1737 | x = skb->sp->xvec[idx]; | |
1738 | if (!x->type->reject) | |
1739 | return 0; | |
1ecafede | 1740 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1741 | } |
1742 | ||
1da177e4 LT |
1743 | /* When skb is transformed back to its "native" form, we have to |
1744 | * check policy restrictions. At the moment we make this in maximally | |
1745 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1746 | * have policy cached at them. | |
1747 | */ | |
1748 | ||
1749 | static inline int | |
a716c119 | 1750 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1751 | unsigned short family) |
1752 | { | |
1753 | if (xfrm_state_kern(x)) | |
928ba416 | 1754 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1755 | return x->id.proto == tmpl->id.proto && |
1756 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1757 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1758 | x->props.mode == tmpl->mode && | |
f3bd4840 MN |
1759 | ((tmpl->aalgos & (1<<x->props.aalgo)) || |
1760 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && | |
7e49e6de MN |
1761 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1762 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1763 | } |
1764 | ||
df0ba92a MN |
1765 | /* |
1766 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1767 | * because of optional transport mode, or next index of the mathced secpath | |
1768 | * state with the template. | |
1769 | * -1 is returned when no matching template is found. | |
1770 | * Otherwise "-2 - errored_index" is returned. | |
1771 | */ | |
1da177e4 LT |
1772 | static inline int |
1773 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1774 | unsigned short family) | |
1775 | { | |
1776 | int idx = start; | |
1777 | ||
1778 | if (tmpl->optional) { | |
7e49e6de | 1779 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1780 | return start; |
1781 | } else | |
1782 | start = -1; | |
1783 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1784 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1785 | return ++idx; |
df0ba92a MN |
1786 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1787 | if (start == -1) | |
1788 | start = -2-idx; | |
1da177e4 | 1789 | break; |
df0ba92a | 1790 | } |
1da177e4 LT |
1791 | } |
1792 | return start; | |
1793 | } | |
1794 | ||
d5422efe HX |
1795 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1796 | unsigned int family, int reverse) | |
1da177e4 LT |
1797 | { |
1798 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1799 | int err; |
1da177e4 LT |
1800 | |
1801 | if (unlikely(afinfo == NULL)) | |
1802 | return -EAFNOSUPPORT; | |
1803 | ||
d5422efe | 1804 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1805 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1806 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1807 | return err; |
1da177e4 | 1808 | } |
d5422efe | 1809 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1810 | |
df0ba92a | 1811 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1812 | { |
1813 | for (; k < sp->len; k++) { | |
df0ba92a | 1814 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1815 | *idxp = k; |
1da177e4 | 1816 | return 1; |
df0ba92a | 1817 | } |
1da177e4 LT |
1818 | } |
1819 | ||
1820 | return 0; | |
1821 | } | |
1822 | ||
a716c119 | 1823 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1824 | unsigned short family) |
1825 | { | |
1826 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1827 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1828 | int npols = 0; | |
1829 | int xfrm_nr; | |
1830 | int pi; | |
d5422efe | 1831 | int reverse; |
1da177e4 | 1832 | struct flowi fl; |
d5422efe | 1833 | u8 fl_dir; |
df0ba92a | 1834 | int xerr_idx = -1; |
1da177e4 | 1835 | |
d5422efe HX |
1836 | reverse = dir & ~XFRM_POLICY_MASK; |
1837 | dir &= XFRM_POLICY_MASK; | |
1838 | fl_dir = policy_to_flow_dir(dir); | |
1839 | ||
0aa64774 MN |
1840 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
1841 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 1842 | return 0; |
0aa64774 MN |
1843 | } |
1844 | ||
eb9c7ebe | 1845 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1846 | |
1847 | /* First, check used SA against their selectors. */ | |
1848 | if (skb->sp) { | |
1849 | int i; | |
1850 | ||
1851 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 1852 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 MN |
1853 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
1854 | XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH); | |
1da177e4 | 1855 | return 0; |
0aa64774 | 1856 | } |
1da177e4 LT |
1857 | } |
1858 | } | |
1859 | ||
1860 | pol = NULL; | |
3bccfbc7 | 1861 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1862 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 MN |
1863 | if (IS_ERR(pol)) { |
1864 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
3bccfbc7 | 1865 | return 0; |
0aa64774 | 1866 | } |
3bccfbc7 | 1867 | } |
1da177e4 LT |
1868 | |
1869 | if (!pol) | |
e0d1caa7 | 1870 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1871 | xfrm_policy_lookup); |
1872 | ||
0aa64774 MN |
1873 | if (IS_ERR(pol)) { |
1874 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1875 | return 0; |
0aa64774 | 1876 | } |
134b0fc5 | 1877 | |
df0ba92a | 1878 | if (!pol) { |
d1d9facf | 1879 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 1880 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
0aa64774 | 1881 | XFRM_INC_STATS(LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
1882 | return 0; |
1883 | } | |
1884 | return 1; | |
1885 | } | |
1da177e4 | 1886 | |
9d729f72 | 1887 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1888 | |
4e81bb83 MN |
1889 | pols[0] = pol; |
1890 | npols ++; | |
1891 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1892 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1893 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1894 | &fl, family, | |
1895 | XFRM_POLICY_IN); | |
1896 | if (pols[1]) { | |
0aa64774 MN |
1897 | if (IS_ERR(pols[1])) { |
1898 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR); | |
134b0fc5 | 1899 | return 0; |
0aa64774 | 1900 | } |
9d729f72 | 1901 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1902 | npols ++; |
1903 | } | |
1904 | } | |
1905 | #endif | |
1906 | ||
1da177e4 LT |
1907 | if (pol->action == XFRM_POLICY_ALLOW) { |
1908 | struct sec_path *sp; | |
1909 | static struct sec_path dummy; | |
4e81bb83 | 1910 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1911 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1912 | struct xfrm_tmpl **tpp = tp; |
1913 | int ti = 0; | |
1da177e4 LT |
1914 | int i, k; |
1915 | ||
1916 | if ((sp = skb->sp) == NULL) | |
1917 | sp = &dummy; | |
1918 | ||
4e81bb83 MN |
1919 | for (pi = 0; pi < npols; pi++) { |
1920 | if (pols[pi] != pol && | |
0aa64774 MN |
1921 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
1922 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); | |
4e81bb83 | 1923 | goto reject; |
0aa64774 MN |
1924 | } |
1925 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1926 | XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR); | |
4e81bb83 | 1927 | goto reject_error; |
0aa64774 | 1928 | } |
4e81bb83 MN |
1929 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
1930 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
1931 | } | |
1932 | xfrm_nr = ti; | |
41a49cc3 MN |
1933 | if (npols > 1) { |
1934 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
1935 | tpp = stp; | |
1936 | } | |
4e81bb83 | 1937 | |
1da177e4 LT |
1938 | /* For each tunnel xfrm, find the first matching tmpl. |
1939 | * For each tmpl before that, find corresponding xfrm. | |
1940 | * Order is _important_. Later we will implement | |
1941 | * some barriers, but at the moment barriers | |
1942 | * are implied between each two transformations. | |
1943 | */ | |
4e81bb83 MN |
1944 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
1945 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 1946 | if (k < 0) { |
d1d9facf JM |
1947 | if (k < -1) |
1948 | /* "-2 - errored_index" returned */ | |
1949 | xerr_idx = -(2+k); | |
0aa64774 | 1950 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 1951 | goto reject; |
df0ba92a | 1952 | } |
1da177e4 LT |
1953 | } |
1954 | ||
0aa64774 MN |
1955 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
1956 | XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH); | |
1da177e4 | 1957 | goto reject; |
0aa64774 | 1958 | } |
1da177e4 | 1959 | |
4e81bb83 | 1960 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1961 | return 1; |
1962 | } | |
0aa64774 | 1963 | XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
1964 | |
1965 | reject: | |
df0ba92a | 1966 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
1967 | reject_error: |
1968 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
1969 | return 0; |
1970 | } | |
1971 | EXPORT_SYMBOL(__xfrm_policy_check); | |
1972 | ||
1973 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
1974 | { | |
1975 | struct flowi fl; | |
1976 | ||
0aa64774 MN |
1977 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
1978 | /* XXX: we should have something like FWDHDRERROR here. */ | |
1979 | XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR); | |
1da177e4 | 1980 | return 0; |
0aa64774 | 1981 | } |
1da177e4 LT |
1982 | |
1983 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
1984 | } | |
1985 | EXPORT_SYMBOL(__xfrm_route_forward); | |
1986 | ||
d49c73c7 DM |
1987 | /* Optimize later using cookies and generation ids. */ |
1988 | ||
1da177e4 LT |
1989 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
1990 | { | |
d49c73c7 DM |
1991 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
1992 | * to "-1" to force all XFRM destinations to get validated by | |
1993 | * dst_ops->check on every use. We do this because when a | |
1994 | * normal route referenced by an XFRM dst is obsoleted we do | |
1995 | * not go looking around for all parent referencing XFRM dsts | |
1996 | * so that we can invalidate them. It is just too much work. | |
1997 | * Instead we make the checks here on every use. For example: | |
1998 | * | |
1999 | * XFRM dst A --> IPv4 dst X | |
2000 | * | |
2001 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2002 | * in this example). If X is marked obsolete, "A" will not | |
2003 | * notice. That's what we are validating here via the | |
2004 | * stale_bundle() check. | |
2005 | * | |
2006 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2007 | * dst which causes it's ->obsolete field to be set to a | |
2008 | * positive non-zero integer. If an XFRM dst has been pruned | |
2009 | * like this, we want to force a new route lookup. | |
399c180a | 2010 | */ |
d49c73c7 DM |
2011 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2012 | return dst; | |
2013 | ||
1da177e4 LT |
2014 | return NULL; |
2015 | } | |
2016 | ||
2017 | static int stale_bundle(struct dst_entry *dst) | |
2018 | { | |
5b368e61 | 2019 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
2020 | } |
2021 | ||
aabc9761 | 2022 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2023 | { |
1da177e4 | 2024 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
5a3e55d6 | 2025 | dst->dev = dev->nd_net->loopback_dev; |
de3cb747 | 2026 | dev_hold(dst->dev); |
1da177e4 LT |
2027 | dev_put(dev); |
2028 | } | |
2029 | } | |
aabc9761 | 2030 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2031 | |
2032 | static void xfrm_link_failure(struct sk_buff *skb) | |
2033 | { | |
2034 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
2035 | return; | |
2036 | } | |
2037 | ||
2038 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2039 | { | |
2040 | if (dst) { | |
2041 | if (dst->obsolete) { | |
2042 | dst_release(dst); | |
2043 | dst = NULL; | |
2044 | } | |
2045 | } | |
2046 | return dst; | |
2047 | } | |
2048 | ||
2518c7c2 DM |
2049 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
2050 | { | |
2051 | struct dst_entry *dst, **dstp; | |
2052 | ||
2053 | write_lock(&pol->lock); | |
2054 | dstp = &pol->bundles; | |
2055 | while ((dst=*dstp) != NULL) { | |
2056 | if (func(dst)) { | |
2057 | *dstp = dst->next; | |
2058 | dst->next = *gc_list_p; | |
2059 | *gc_list_p = dst; | |
2060 | } else { | |
2061 | dstp = &dst->next; | |
2062 | } | |
2063 | } | |
2064 | write_unlock(&pol->lock); | |
2065 | } | |
2066 | ||
1da177e4 LT |
2067 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
2068 | { | |
2518c7c2 DM |
2069 | struct dst_entry *gc_list = NULL; |
2070 | int dir; | |
1da177e4 LT |
2071 | |
2072 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
2073 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
2074 | struct xfrm_policy *pol; | |
2075 | struct hlist_node *entry; | |
2076 | struct hlist_head *table; | |
2077 | int i; | |
4e81bb83 | 2078 | |
2518c7c2 DM |
2079 | hlist_for_each_entry(pol, entry, |
2080 | &xfrm_policy_inexact[dir], bydst) | |
2081 | prune_one_bundle(pol, func, &gc_list); | |
2082 | ||
2083 | table = xfrm_policy_bydst[dir].table; | |
2084 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
2085 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
2086 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
2087 | } |
2088 | } | |
2089 | read_unlock_bh(&xfrm_policy_lock); | |
2090 | ||
2091 | while (gc_list) { | |
2518c7c2 | 2092 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2093 | gc_list = dst->next; |
2094 | dst_free(dst); | |
2095 | } | |
2096 | } | |
2097 | ||
2098 | static int unused_bundle(struct dst_entry *dst) | |
2099 | { | |
2100 | return !atomic_read(&dst->__refcnt); | |
2101 | } | |
2102 | ||
2103 | static void __xfrm_garbage_collect(void) | |
2104 | { | |
2105 | xfrm_prune_bundles(unused_bundle); | |
2106 | } | |
2107 | ||
1c095399 | 2108 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
2109 | { |
2110 | xfrm_prune_bundles(stale_bundle); | |
2111 | return 0; | |
2112 | } | |
2113 | ||
25ee3286 | 2114 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2115 | { |
2116 | do { | |
2117 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2118 | u32 pmtu, route_mtu_cached; | |
2119 | ||
2120 | pmtu = dst_mtu(dst->child); | |
2121 | xdst->child_mtu_cached = pmtu; | |
2122 | ||
2123 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2124 | ||
2125 | route_mtu_cached = dst_mtu(xdst->route); | |
2126 | xdst->route_mtu_cached = route_mtu_cached; | |
2127 | ||
2128 | if (pmtu > route_mtu_cached) | |
2129 | pmtu = route_mtu_cached; | |
2130 | ||
2131 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2132 | } while ((dst = dst->next)); | |
2133 | } | |
2134 | ||
1da177e4 LT |
2135 | /* Check that the bundle accepts the flow and its components are |
2136 | * still valid. | |
2137 | */ | |
2138 | ||
5b368e61 VY |
2139 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2140 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2141 | { |
2142 | struct dst_entry *dst = &first->u.dst; | |
2143 | struct xfrm_dst *last; | |
2144 | u32 mtu; | |
2145 | ||
92d63dec | 2146 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2147 | (dst->dev && !netif_running(dst->dev))) |
2148 | return 0; | |
157bfc25 MN |
2149 | #ifdef CONFIG_XFRM_SUB_POLICY |
2150 | if (fl) { | |
2151 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2152 | return 0; | |
2153 | if (first->partner && | |
2154 | !xfrm_selector_match(first->partner, fl, family)) | |
2155 | return 0; | |
2156 | } | |
2157 | #endif | |
1da177e4 LT |
2158 | |
2159 | last = NULL; | |
2160 | ||
2161 | do { | |
2162 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2163 | ||
2164 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2165 | return 0; | |
67f83cbf VY |
2166 | if (fl && pol && |
2167 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2168 | return 0; |
1da177e4 LT |
2169 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2170 | return 0; | |
9d4a706d DM |
2171 | if (xdst->genid != dst->xfrm->genid) |
2172 | return 0; | |
e53820de | 2173 | |
1bfcb10f | 2174 | if (strict && fl && |
13996378 | 2175 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2176 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2177 | return 0; | |
1da177e4 LT |
2178 | |
2179 | mtu = dst_mtu(dst->child); | |
2180 | if (xdst->child_mtu_cached != mtu) { | |
2181 | last = xdst; | |
2182 | xdst->child_mtu_cached = mtu; | |
2183 | } | |
2184 | ||
92d63dec | 2185 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2186 | return 0; |
2187 | mtu = dst_mtu(xdst->route); | |
2188 | if (xdst->route_mtu_cached != mtu) { | |
2189 | last = xdst; | |
2190 | xdst->route_mtu_cached = mtu; | |
2191 | } | |
2192 | ||
2193 | dst = dst->child; | |
2194 | } while (dst->xfrm); | |
2195 | ||
2196 | if (likely(!last)) | |
2197 | return 1; | |
2198 | ||
2199 | mtu = last->child_mtu_cached; | |
2200 | for (;;) { | |
2201 | dst = &last->u.dst; | |
2202 | ||
2203 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2204 | if (mtu > last->route_mtu_cached) | |
2205 | mtu = last->route_mtu_cached; | |
2206 | dst->metrics[RTAX_MTU-1] = mtu; | |
2207 | ||
2208 | if (last == first) | |
2209 | break; | |
2210 | ||
bd0bf076 | 2211 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2212 | last->child_mtu_cached = mtu; |
2213 | } | |
2214 | ||
2215 | return 1; | |
2216 | } | |
2217 | ||
2218 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2219 | ||
1da177e4 LT |
2220 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2221 | { | |
2222 | int err = 0; | |
2223 | if (unlikely(afinfo == NULL)) | |
2224 | return -EINVAL; | |
2225 | if (unlikely(afinfo->family >= NPROTO)) | |
2226 | return -EAFNOSUPPORT; | |
e959d812 | 2227 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2228 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2229 | err = -ENOBUFS; | |
2230 | else { | |
2231 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2232 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2233 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2234 | if (likely(dst_ops->check == NULL)) | |
2235 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2236 | if (likely(dst_ops->negative_advice == NULL)) |
2237 | dst_ops->negative_advice = xfrm_negative_advice; | |
2238 | if (likely(dst_ops->link_failure == NULL)) | |
2239 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2240 | if (likely(afinfo->garbage_collect == NULL)) |
2241 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2242 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2243 | } | |
e959d812 | 2244 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2245 | return err; |
2246 | } | |
2247 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2248 | ||
2249 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2250 | { | |
2251 | int err = 0; | |
2252 | if (unlikely(afinfo == NULL)) | |
2253 | return -EINVAL; | |
2254 | if (unlikely(afinfo->family >= NPROTO)) | |
2255 | return -EAFNOSUPPORT; | |
e959d812 | 2256 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2257 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2258 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2259 | err = -EINVAL; | |
2260 | else { | |
2261 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2262 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2263 | dst_ops->kmem_cachep = NULL; | |
2264 | dst_ops->check = NULL; | |
1da177e4 LT |
2265 | dst_ops->negative_advice = NULL; |
2266 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2267 | afinfo->garbage_collect = NULL; |
2268 | } | |
2269 | } | |
e959d812 | 2270 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2271 | return err; |
2272 | } | |
2273 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2274 | ||
2275 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2276 | { | |
2277 | struct xfrm_policy_afinfo *afinfo; | |
2278 | if (unlikely(family >= NPROTO)) | |
2279 | return NULL; | |
2280 | read_lock(&xfrm_policy_afinfo_lock); | |
2281 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2282 | if (unlikely(!afinfo)) |
2283 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2284 | return afinfo; |
2285 | } | |
2286 | ||
2287 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2288 | { | |
546be240 HX |
2289 | read_unlock(&xfrm_policy_afinfo_lock); |
2290 | } | |
2291 | ||
1da177e4 LT |
2292 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2293 | { | |
e9dc8653 EB |
2294 | struct net_device *dev = ptr; |
2295 | ||
2296 | if (dev->nd_net != &init_net) | |
2297 | return NOTIFY_DONE; | |
2298 | ||
1da177e4 LT |
2299 | switch (event) { |
2300 | case NETDEV_DOWN: | |
2301 | xfrm_flush_bundles(); | |
2302 | } | |
2303 | return NOTIFY_DONE; | |
2304 | } | |
2305 | ||
2306 | static struct notifier_block xfrm_dev_notifier = { | |
2307 | xfrm_dev_event, | |
2308 | NULL, | |
2309 | 0 | |
2310 | }; | |
2311 | ||
558f82ef MN |
2312 | #ifdef CONFIG_XFRM_STATISTICS |
2313 | static int __init xfrm_statistics_init(void) | |
2314 | { | |
2315 | if (snmp_mib_init((void **)xfrm_statistics, | |
2316 | sizeof(struct linux_xfrm_mib)) < 0) | |
2317 | return -ENOMEM; | |
2318 | return 0; | |
2319 | } | |
2320 | #endif | |
2321 | ||
1da177e4 LT |
2322 | static void __init xfrm_policy_init(void) |
2323 | { | |
2518c7c2 DM |
2324 | unsigned int hmask, sz; |
2325 | int dir; | |
2326 | ||
1da177e4 LT |
2327 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
2328 | sizeof(struct xfrm_dst), | |
e5d679f3 | 2329 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2330 | NULL); |
1da177e4 | 2331 | |
2518c7c2 DM |
2332 | hmask = 8 - 1; |
2333 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2334 | ||
44e36b42 | 2335 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2336 | xfrm_idx_hmask = hmask; |
2337 | if (!xfrm_policy_byidx) | |
2338 | panic("XFRM: failed to allocate byidx hash\n"); | |
2339 | ||
2340 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2341 | struct xfrm_policy_hash *htab; | |
2342 | ||
2343 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); | |
2344 | ||
2345 | htab = &xfrm_policy_bydst[dir]; | |
44e36b42 | 2346 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2347 | htab->hmask = hmask; |
2348 | if (!htab->table) | |
2349 | panic("XFRM: failed to allocate bydst hash\n"); | |
2350 | } | |
2351 | ||
c4028958 | 2352 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
2353 | register_netdevice_notifier(&xfrm_dev_notifier); |
2354 | } | |
2355 | ||
2356 | void __init xfrm_init(void) | |
2357 | { | |
558f82ef MN |
2358 | #ifdef CONFIG_XFRM_STATISTICS |
2359 | xfrm_statistics_init(); | |
2360 | #endif | |
1da177e4 LT |
2361 | xfrm_state_init(); |
2362 | xfrm_policy_init(); | |
2363 | xfrm_input_init(); | |
558f82ef MN |
2364 | #ifdef CONFIG_XFRM_STATISTICS |
2365 | xfrm_proc_init(); | |
2366 | #endif | |
1da177e4 LT |
2367 | } |
2368 | ||
ab5f5e8b JL |
2369 | #ifdef CONFIG_AUDITSYSCALL |
2370 | static inline void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, | |
2371 | struct audit_buffer *audit_buf) | |
2372 | { | |
875179fa PM |
2373 | struct xfrm_sec_ctx *ctx = xp->security; |
2374 | struct xfrm_selector *sel = &xp->selector; | |
2375 | ||
2376 | if (ctx) | |
ab5f5e8b | 2377 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2378 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2379 | |
875179fa | 2380 | switch(sel->family) { |
ab5f5e8b | 2381 | case AF_INET: |
875179fa PM |
2382 | audit_log_format(audit_buf, " src=" NIPQUAD_FMT, |
2383 | NIPQUAD(sel->saddr.a4)); | |
2384 | if (sel->prefixlen_s != 32) | |
2385 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2386 | sel->prefixlen_s); | |
2387 | audit_log_format(audit_buf, " dst=" NIPQUAD_FMT, | |
2388 | NIPQUAD(sel->daddr.a4)); | |
2389 | if (sel->prefixlen_d != 32) | |
2390 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2391 | sel->prefixlen_d); | |
ab5f5e8b JL |
2392 | break; |
2393 | case AF_INET6: | |
875179fa PM |
2394 | audit_log_format(audit_buf, " src=" NIP6_FMT, |
2395 | NIP6(*(struct in6_addr *)sel->saddr.a6)); | |
2396 | if (sel->prefixlen_s != 128) | |
2397 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2398 | sel->prefixlen_s); | |
2399 | audit_log_format(audit_buf, " dst=" NIP6_FMT, | |
2400 | NIP6(*(struct in6_addr *)sel->daddr.a6)); | |
2401 | if (sel->prefixlen_d != 128) | |
2402 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2403 | sel->prefixlen_d); | |
ab5f5e8b JL |
2404 | break; |
2405 | } | |
2406 | } | |
2407 | ||
68277acc PM |
2408 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2409 | u32 auid, u32 secid) | |
ab5f5e8b JL |
2410 | { |
2411 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2412 | |
afeb14b4 | 2413 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2414 | if (audit_buf == NULL) |
2415 | return; | |
afeb14b4 PM |
2416 | xfrm_audit_helper_usrinfo(auid, secid, audit_buf); |
2417 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2418 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2419 | audit_log_end(audit_buf); | |
2420 | } | |
2421 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2422 | ||
68277acc PM |
2423 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2424 | u32 auid, u32 secid) | |
ab5f5e8b JL |
2425 | { |
2426 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2427 | |
afeb14b4 | 2428 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2429 | if (audit_buf == NULL) |
2430 | return; | |
afeb14b4 PM |
2431 | xfrm_audit_helper_usrinfo(auid, secid, audit_buf); |
2432 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
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 |