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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * xfrm_state.c | |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * YOSHIFUJI Hideaki @USAGI | |
10 | * Split up af-specific functions | |
11 | * Derek Atkins <derek@ihtfp.com> | |
12 | * Add UDP Encapsulation | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
16 | #include <linux/workqueue.h> | |
17 | #include <net/xfrm.h> | |
18 | #include <linux/pfkeyv2.h> | |
19 | #include <linux/ipsec.h> | |
20 | #include <linux/module.h> | |
f034b5d4 | 21 | #include <linux/cache.h> |
68277acc | 22 | #include <linux/audit.h> |
b5890d8b | 23 | #include <asm/uaccess.h> |
9e0d57fd | 24 | #include <linux/ktime.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
9e0d57fd YP |
26 | #include <linux/interrupt.h> |
27 | #include <linux/kernel.h> | |
1da177e4 | 28 | |
44e36b42 DM |
29 | #include "xfrm_hash.h" |
30 | ||
1da177e4 LT |
31 | /* Each xfrm_state may be linked to two tables: |
32 | ||
33 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) | |
a624c108 | 34 | 2. Hash table by (daddr,family,reqid) to find what SAs exist for given |
1da177e4 LT |
35 | destination/tunnel endpoint. (output) |
36 | */ | |
37 | ||
38 | static DEFINE_SPINLOCK(xfrm_state_lock); | |
39 | ||
f034b5d4 | 40 | static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; |
f034b5d4 | 41 | |
17c2a42a HX |
42 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); |
43 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
44 | ||
afeb14b4 PM |
45 | #ifdef CONFIG_AUDITSYSCALL |
46 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
47 | struct sk_buff *skb, __be32 net_seq); | |
48 | #else | |
49 | #define xfrm_audit_state_replay(x, s, sq) do { ; } while (0) | |
50 | #endif /* CONFIG_AUDITSYSCALL */ | |
51 | ||
64d0cd00 | 52 | static inline unsigned int xfrm_dst_hash(struct net *net, |
2ab38503 DM |
53 | const xfrm_address_t *daddr, |
54 | const xfrm_address_t *saddr, | |
c1969f29 | 55 | u32 reqid, |
a624c108 | 56 | unsigned short family) |
f034b5d4 | 57 | { |
64d0cd00 | 58 | return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); |
f034b5d4 DM |
59 | } |
60 | ||
64d0cd00 | 61 | static inline unsigned int xfrm_src_hash(struct net *net, |
2ab38503 DM |
62 | const xfrm_address_t *daddr, |
63 | const xfrm_address_t *saddr, | |
44e36b42 | 64 | unsigned short family) |
f034b5d4 | 65 | { |
64d0cd00 | 66 | return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); |
f034b5d4 DM |
67 | } |
68 | ||
f034b5d4 | 69 | static inline unsigned int |
2ab38503 DM |
70 | xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr, |
71 | __be32 spi, u8 proto, unsigned short family) | |
f034b5d4 | 72 | { |
64d0cd00 | 73 | return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); |
f034b5d4 DM |
74 | } |
75 | ||
f034b5d4 DM |
76 | static void xfrm_hash_transfer(struct hlist_head *list, |
77 | struct hlist_head *ndsttable, | |
78 | struct hlist_head *nsrctable, | |
79 | struct hlist_head *nspitable, | |
80 | unsigned int nhashmask) | |
81 | { | |
82 | struct hlist_node *entry, *tmp; | |
83 | struct xfrm_state *x; | |
84 | ||
85 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
86 | unsigned int h; | |
87 | ||
c1969f29 DM |
88 | h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
89 | x->props.reqid, x->props.family, | |
90 | nhashmask); | |
f034b5d4 DM |
91 | hlist_add_head(&x->bydst, ndsttable+h); |
92 | ||
667bbcb6 MN |
93 | h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, |
94 | x->props.family, | |
f034b5d4 DM |
95 | nhashmask); |
96 | hlist_add_head(&x->bysrc, nsrctable+h); | |
97 | ||
7b4dc360 MN |
98 | if (x->id.spi) { |
99 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, | |
100 | x->id.proto, x->props.family, | |
101 | nhashmask); | |
102 | hlist_add_head(&x->byspi, nspitable+h); | |
103 | } | |
f034b5d4 DM |
104 | } |
105 | } | |
106 | ||
63082733 | 107 | static unsigned long xfrm_hash_new_size(unsigned int state_hmask) |
f034b5d4 | 108 | { |
63082733 | 109 | return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); |
f034b5d4 DM |
110 | } |
111 | ||
112 | static DEFINE_MUTEX(hash_resize_mutex); | |
113 | ||
63082733 | 114 | static void xfrm_hash_resize(struct work_struct *work) |
f034b5d4 | 115 | { |
63082733 | 116 | struct net *net = container_of(work, struct net, xfrm.state_hash_work); |
f034b5d4 DM |
117 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; |
118 | unsigned long nsize, osize; | |
119 | unsigned int nhashmask, ohashmask; | |
120 | int i; | |
121 | ||
122 | mutex_lock(&hash_resize_mutex); | |
123 | ||
63082733 | 124 | nsize = xfrm_hash_new_size(net->xfrm.state_hmask); |
44e36b42 | 125 | ndst = xfrm_hash_alloc(nsize); |
f034b5d4 DM |
126 | if (!ndst) |
127 | goto out_unlock; | |
44e36b42 | 128 | nsrc = xfrm_hash_alloc(nsize); |
f034b5d4 | 129 | if (!nsrc) { |
44e36b42 | 130 | xfrm_hash_free(ndst, nsize); |
f034b5d4 DM |
131 | goto out_unlock; |
132 | } | |
44e36b42 | 133 | nspi = xfrm_hash_alloc(nsize); |
f034b5d4 | 134 | if (!nspi) { |
44e36b42 DM |
135 | xfrm_hash_free(ndst, nsize); |
136 | xfrm_hash_free(nsrc, nsize); | |
f034b5d4 DM |
137 | goto out_unlock; |
138 | } | |
139 | ||
140 | spin_lock_bh(&xfrm_state_lock); | |
141 | ||
142 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
63082733 AD |
143 | for (i = net->xfrm.state_hmask; i >= 0; i--) |
144 | xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi, | |
f034b5d4 DM |
145 | nhashmask); |
146 | ||
63082733 AD |
147 | odst = net->xfrm.state_bydst; |
148 | osrc = net->xfrm.state_bysrc; | |
149 | ospi = net->xfrm.state_byspi; | |
150 | ohashmask = net->xfrm.state_hmask; | |
f034b5d4 | 151 | |
63082733 AD |
152 | net->xfrm.state_bydst = ndst; |
153 | net->xfrm.state_bysrc = nsrc; | |
154 | net->xfrm.state_byspi = nspi; | |
155 | net->xfrm.state_hmask = nhashmask; | |
f034b5d4 DM |
156 | |
157 | spin_unlock_bh(&xfrm_state_lock); | |
158 | ||
159 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 DM |
160 | xfrm_hash_free(odst, osize); |
161 | xfrm_hash_free(osrc, osize); | |
162 | xfrm_hash_free(ospi, osize); | |
f034b5d4 DM |
163 | |
164 | out_unlock: | |
165 | mutex_unlock(&hash_resize_mutex); | |
166 | } | |
167 | ||
1da177e4 LT |
168 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); |
169 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
170 | ||
1da177e4 LT |
171 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
172 | ||
53bc6b4d | 173 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 | 174 | |
980ebd25 | 175 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d | 176 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
1da177e4 | 177 | |
aa5d62cc HX |
178 | static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family) |
179 | { | |
180 | struct xfrm_state_afinfo *afinfo; | |
181 | if (unlikely(family >= NPROTO)) | |
182 | return NULL; | |
183 | write_lock_bh(&xfrm_state_afinfo_lock); | |
184 | afinfo = xfrm_state_afinfo[family]; | |
185 | if (unlikely(!afinfo)) | |
186 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
187 | return afinfo; | |
188 | } | |
189 | ||
190 | static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo) | |
9a429c49 | 191 | __releases(xfrm_state_afinfo_lock) |
aa5d62cc HX |
192 | { |
193 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
194 | } | |
195 | ||
533cb5b0 | 196 | int xfrm_register_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
197 | { |
198 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 199 | const struct xfrm_type **typemap; |
aa5d62cc HX |
200 | int err = 0; |
201 | ||
202 | if (unlikely(afinfo == NULL)) | |
203 | return -EAFNOSUPPORT; | |
204 | typemap = afinfo->type_map; | |
205 | ||
206 | if (likely(typemap[type->proto] == NULL)) | |
207 | typemap[type->proto] = type; | |
208 | else | |
209 | err = -EEXIST; | |
210 | xfrm_state_unlock_afinfo(afinfo); | |
211 | return err; | |
212 | } | |
213 | EXPORT_SYMBOL(xfrm_register_type); | |
214 | ||
533cb5b0 | 215 | int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
216 | { |
217 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 218 | const struct xfrm_type **typemap; |
aa5d62cc HX |
219 | int err = 0; |
220 | ||
221 | if (unlikely(afinfo == NULL)) | |
222 | return -EAFNOSUPPORT; | |
223 | typemap = afinfo->type_map; | |
224 | ||
225 | if (unlikely(typemap[type->proto] != type)) | |
226 | err = -ENOENT; | |
227 | else | |
228 | typemap[type->proto] = NULL; | |
229 | xfrm_state_unlock_afinfo(afinfo); | |
230 | return err; | |
231 | } | |
232 | EXPORT_SYMBOL(xfrm_unregister_type); | |
233 | ||
533cb5b0 | 234 | static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) |
aa5d62cc HX |
235 | { |
236 | struct xfrm_state_afinfo *afinfo; | |
533cb5b0 ED |
237 | const struct xfrm_type **typemap; |
238 | const struct xfrm_type *type; | |
aa5d62cc HX |
239 | int modload_attempted = 0; |
240 | ||
241 | retry: | |
242 | afinfo = xfrm_state_get_afinfo(family); | |
243 | if (unlikely(afinfo == NULL)) | |
244 | return NULL; | |
245 | typemap = afinfo->type_map; | |
246 | ||
247 | type = typemap[proto]; | |
248 | if (unlikely(type && !try_module_get(type->owner))) | |
249 | type = NULL; | |
250 | if (!type && !modload_attempted) { | |
251 | xfrm_state_put_afinfo(afinfo); | |
252 | request_module("xfrm-type-%d-%d", family, proto); | |
253 | modload_attempted = 1; | |
254 | goto retry; | |
255 | } | |
256 | ||
257 | xfrm_state_put_afinfo(afinfo); | |
258 | return type; | |
259 | } | |
260 | ||
533cb5b0 | 261 | static void xfrm_put_type(const struct xfrm_type *type) |
aa5d62cc HX |
262 | { |
263 | module_put(type->owner); | |
264 | } | |
265 | ||
266 | int xfrm_register_mode(struct xfrm_mode *mode, int family) | |
267 | { | |
268 | struct xfrm_state_afinfo *afinfo; | |
269 | struct xfrm_mode **modemap; | |
270 | int err; | |
271 | ||
272 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
273 | return -EINVAL; | |
274 | ||
275 | afinfo = xfrm_state_lock_afinfo(family); | |
276 | if (unlikely(afinfo == NULL)) | |
277 | return -EAFNOSUPPORT; | |
278 | ||
279 | err = -EEXIST; | |
280 | modemap = afinfo->mode_map; | |
17c2a42a HX |
281 | if (modemap[mode->encap]) |
282 | goto out; | |
aa5d62cc | 283 | |
17c2a42a HX |
284 | err = -ENOENT; |
285 | if (!try_module_get(afinfo->owner)) | |
286 | goto out; | |
287 | ||
288 | mode->afinfo = afinfo; | |
289 | modemap[mode->encap] = mode; | |
290 | err = 0; | |
291 | ||
292 | out: | |
aa5d62cc HX |
293 | xfrm_state_unlock_afinfo(afinfo); |
294 | return err; | |
295 | } | |
296 | EXPORT_SYMBOL(xfrm_register_mode); | |
297 | ||
298 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
299 | { | |
300 | struct xfrm_state_afinfo *afinfo; | |
301 | struct xfrm_mode **modemap; | |
302 | int err; | |
303 | ||
304 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
305 | return -EINVAL; | |
306 | ||
307 | afinfo = xfrm_state_lock_afinfo(family); | |
308 | if (unlikely(afinfo == NULL)) | |
309 | return -EAFNOSUPPORT; | |
310 | ||
311 | err = -ENOENT; | |
312 | modemap = afinfo->mode_map; | |
313 | if (likely(modemap[mode->encap] == mode)) { | |
314 | modemap[mode->encap] = NULL; | |
17c2a42a | 315 | module_put(mode->afinfo->owner); |
aa5d62cc HX |
316 | err = 0; |
317 | } | |
318 | ||
319 | xfrm_state_unlock_afinfo(afinfo); | |
320 | return err; | |
321 | } | |
322 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
323 | ||
324 | static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
325 | { | |
326 | struct xfrm_state_afinfo *afinfo; | |
327 | struct xfrm_mode *mode; | |
328 | int modload_attempted = 0; | |
329 | ||
330 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
331 | return NULL; | |
332 | ||
333 | retry: | |
334 | afinfo = xfrm_state_get_afinfo(family); | |
335 | if (unlikely(afinfo == NULL)) | |
336 | return NULL; | |
337 | ||
338 | mode = afinfo->mode_map[encap]; | |
339 | if (unlikely(mode && !try_module_get(mode->owner))) | |
340 | mode = NULL; | |
341 | if (!mode && !modload_attempted) { | |
342 | xfrm_state_put_afinfo(afinfo); | |
343 | request_module("xfrm-mode-%d-%d", family, encap); | |
344 | modload_attempted = 1; | |
345 | goto retry; | |
346 | } | |
347 | ||
348 | xfrm_state_put_afinfo(afinfo); | |
349 | return mode; | |
350 | } | |
351 | ||
352 | static void xfrm_put_mode(struct xfrm_mode *mode) | |
353 | { | |
354 | module_put(mode->owner); | |
355 | } | |
356 | ||
1da177e4 LT |
357 | static void xfrm_state_gc_destroy(struct xfrm_state *x) |
358 | { | |
9e0d57fd | 359 | tasklet_hrtimer_cancel(&x->mtimer); |
a47f0ce0 | 360 | del_timer_sync(&x->rtimer); |
a51482bd JJ |
361 | kfree(x->aalg); |
362 | kfree(x->ealg); | |
363 | kfree(x->calg); | |
364 | kfree(x->encap); | |
060f02a3 | 365 | kfree(x->coaddr); |
13996378 HX |
366 | if (x->inner_mode) |
367 | xfrm_put_mode(x->inner_mode); | |
df9dcb45 KM |
368 | if (x->inner_mode_iaf) |
369 | xfrm_put_mode(x->inner_mode_iaf); | |
13996378 HX |
370 | if (x->outer_mode) |
371 | xfrm_put_mode(x->outer_mode); | |
1da177e4 LT |
372 | if (x->type) { |
373 | x->type->destructor(x); | |
374 | xfrm_put_type(x->type); | |
375 | } | |
df71837d | 376 | security_xfrm_state_free(x); |
1da177e4 LT |
377 | kfree(x); |
378 | } | |
379 | ||
c7837144 | 380 | static void xfrm_state_gc_task(struct work_struct *work) |
1da177e4 | 381 | { |
c7837144 | 382 | struct net *net = container_of(work, struct net, xfrm.state_gc_work); |
12a169e7 HX |
383 | struct xfrm_state *x; |
384 | struct hlist_node *entry, *tmp; | |
385 | struct hlist_head gc_list; | |
1da177e4 | 386 | |
1da177e4 | 387 | spin_lock_bh(&xfrm_state_gc_lock); |
c7837144 | 388 | hlist_move_list(&net->xfrm.state_gc_list, &gc_list); |
1da177e4 LT |
389 | spin_unlock_bh(&xfrm_state_gc_lock); |
390 | ||
12a169e7 | 391 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist) |
1da177e4 | 392 | xfrm_state_gc_destroy(x); |
8f126e37 | 393 | |
50a30657 | 394 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
395 | } |
396 | ||
397 | static inline unsigned long make_jiffies(long secs) | |
398 | { | |
399 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
400 | return MAX_SCHEDULE_TIMEOUT-1; | |
401 | else | |
a716c119 | 402 | return secs*HZ; |
1da177e4 LT |
403 | } |
404 | ||
9e0d57fd | 405 | static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me) |
1da177e4 | 406 | { |
9e0d57fd YP |
407 | struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer); |
408 | struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer); | |
98806f75 | 409 | struct net *net = xs_net(x); |
9d729f72 | 410 | unsigned long now = get_seconds(); |
1da177e4 LT |
411 | long next = LONG_MAX; |
412 | int warn = 0; | |
161a09e7 | 413 | int err = 0; |
1da177e4 LT |
414 | |
415 | spin_lock(&x->lock); | |
416 | if (x->km.state == XFRM_STATE_DEAD) | |
417 | goto out; | |
418 | if (x->km.state == XFRM_STATE_EXPIRED) | |
419 | goto expired; | |
420 | if (x->lft.hard_add_expires_seconds) { | |
421 | long tmo = x->lft.hard_add_expires_seconds + | |
422 | x->curlft.add_time - now; | |
423 | if (tmo <= 0) | |
424 | goto expired; | |
425 | if (tmo < next) | |
426 | next = tmo; | |
427 | } | |
428 | if (x->lft.hard_use_expires_seconds) { | |
429 | long tmo = x->lft.hard_use_expires_seconds + | |
430 | (x->curlft.use_time ? : now) - now; | |
431 | if (tmo <= 0) | |
432 | goto expired; | |
433 | if (tmo < next) | |
434 | next = tmo; | |
435 | } | |
436 | if (x->km.dying) | |
437 | goto resched; | |
438 | if (x->lft.soft_add_expires_seconds) { | |
439 | long tmo = x->lft.soft_add_expires_seconds + | |
440 | x->curlft.add_time - now; | |
441 | if (tmo <= 0) | |
442 | warn = 1; | |
443 | else if (tmo < next) | |
444 | next = tmo; | |
445 | } | |
446 | if (x->lft.soft_use_expires_seconds) { | |
447 | long tmo = x->lft.soft_use_expires_seconds + | |
448 | (x->curlft.use_time ? : now) - now; | |
449 | if (tmo <= 0) | |
450 | warn = 1; | |
451 | else if (tmo < next) | |
452 | next = tmo; | |
453 | } | |
454 | ||
4666faab | 455 | x->km.dying = warn; |
1da177e4 | 456 | if (warn) |
53bc6b4d | 457 | km_state_expired(x, 0, 0); |
1da177e4 | 458 | resched: |
9e0d57fd YP |
459 | if (next != LONG_MAX){ |
460 | tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL); | |
461 | } | |
a47f0ce0 | 462 | |
1da177e4 LT |
463 | goto out; |
464 | ||
465 | expired: | |
466 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
467 | x->km.state = XFRM_STATE_EXPIRED; | |
98806f75 | 468 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
469 | next = 2; |
470 | goto resched; | |
471 | } | |
161a09e7 JL |
472 | |
473 | err = __xfrm_state_delete(x); | |
474 | if (!err && x->id.spi) | |
53bc6b4d | 475 | km_state_expired(x, 1, 0); |
1da177e4 | 476 | |
ab5f5e8b | 477 | xfrm_audit_state_delete(x, err ? 0 : 1, |
2532386f EP |
478 | audit_get_loginuid(current), |
479 | audit_get_sessionid(current), 0); | |
161a09e7 | 480 | |
1da177e4 LT |
481 | out: |
482 | spin_unlock(&x->lock); | |
9e0d57fd | 483 | return HRTIMER_NORESTART; |
1da177e4 LT |
484 | } |
485 | ||
0ac84752 DM |
486 | static void xfrm_replay_timer_handler(unsigned long data); |
487 | ||
673c09be | 488 | struct xfrm_state *xfrm_state_alloc(struct net *net) |
1da177e4 LT |
489 | { |
490 | struct xfrm_state *x; | |
491 | ||
0da974f4 | 492 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
493 | |
494 | if (x) { | |
673c09be | 495 | write_pnet(&x->xs_net, net); |
1da177e4 LT |
496 | atomic_set(&x->refcnt, 1); |
497 | atomic_set(&x->tunnel_users, 0); | |
12a169e7 | 498 | INIT_LIST_HEAD(&x->km.all); |
8f126e37 DM |
499 | INIT_HLIST_NODE(&x->bydst); |
500 | INIT_HLIST_NODE(&x->bysrc); | |
501 | INIT_HLIST_NODE(&x->byspi); | |
9e0d57fd | 502 | tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS); |
b24b8a24 PE |
503 | setup_timer(&x->rtimer, xfrm_replay_timer_handler, |
504 | (unsigned long)x); | |
9d729f72 | 505 | x->curlft.add_time = get_seconds(); |
1da177e4 LT |
506 | x->lft.soft_byte_limit = XFRM_INF; |
507 | x->lft.soft_packet_limit = XFRM_INF; | |
508 | x->lft.hard_byte_limit = XFRM_INF; | |
509 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
510 | x->replay_maxage = 0; |
511 | x->replay_maxdiff = 0; | |
df9dcb45 KM |
512 | x->inner_mode = NULL; |
513 | x->inner_mode_iaf = NULL; | |
1da177e4 LT |
514 | spin_lock_init(&x->lock); |
515 | } | |
516 | return x; | |
517 | } | |
518 | EXPORT_SYMBOL(xfrm_state_alloc); | |
519 | ||
520 | void __xfrm_state_destroy(struct xfrm_state *x) | |
521 | { | |
98806f75 AD |
522 | struct net *net = xs_net(x); |
523 | ||
547b792c | 524 | WARN_ON(x->km.state != XFRM_STATE_DEAD); |
1da177e4 LT |
525 | |
526 | spin_lock_bh(&xfrm_state_gc_lock); | |
98806f75 | 527 | hlist_add_head(&x->gclist, &net->xfrm.state_gc_list); |
1da177e4 | 528 | spin_unlock_bh(&xfrm_state_gc_lock); |
98806f75 | 529 | schedule_work(&net->xfrm.state_gc_work); |
1da177e4 LT |
530 | } |
531 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
532 | ||
53bc6b4d | 533 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 534 | { |
98806f75 | 535 | struct net *net = xs_net(x); |
26b15dad JHS |
536 | int err = -ESRCH; |
537 | ||
1da177e4 LT |
538 | if (x->km.state != XFRM_STATE_DEAD) { |
539 | x->km.state = XFRM_STATE_DEAD; | |
540 | spin_lock(&xfrm_state_lock); | |
12a169e7 | 541 | list_del(&x->km.all); |
8f126e37 | 542 | hlist_del(&x->bydst); |
8f126e37 | 543 | hlist_del(&x->bysrc); |
a47f0ce0 | 544 | if (x->id.spi) |
8f126e37 | 545 | hlist_del(&x->byspi); |
98806f75 | 546 | net->xfrm.state_num--; |
1da177e4 | 547 | spin_unlock(&xfrm_state_lock); |
1da177e4 | 548 | |
1da177e4 LT |
549 | /* All xfrm_state objects are created by xfrm_state_alloc. |
550 | * The xfrm_state_alloc call gives a reference, and that | |
551 | * is what we are dropping here. | |
552 | */ | |
5dba4797 | 553 | xfrm_state_put(x); |
26b15dad | 554 | err = 0; |
1da177e4 | 555 | } |
26b15dad JHS |
556 | |
557 | return err; | |
1da177e4 | 558 | } |
53bc6b4d | 559 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 560 | |
26b15dad | 561 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 562 | { |
26b15dad JHS |
563 | int err; |
564 | ||
1da177e4 | 565 | spin_lock_bh(&x->lock); |
26b15dad | 566 | err = __xfrm_state_delete(x); |
1da177e4 | 567 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
568 | |
569 | return err; | |
1da177e4 LT |
570 | } |
571 | EXPORT_SYMBOL(xfrm_state_delete); | |
572 | ||
4aa2e62c JL |
573 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
574 | static inline int | |
0e602451 | 575 | xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
1da177e4 | 576 | { |
4aa2e62c JL |
577 | int i, err = 0; |
578 | ||
0e602451 | 579 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
4aa2e62c JL |
580 | struct hlist_node *entry; |
581 | struct xfrm_state *x; | |
582 | ||
0e602451 | 583 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
4aa2e62c JL |
584 | if (xfrm_id_proto_match(x->id.proto, proto) && |
585 | (err = security_xfrm_state_delete(x)) != 0) { | |
ab5f5e8b JL |
586 | xfrm_audit_state_delete(x, 0, |
587 | audit_info->loginuid, | |
2532386f | 588 | audit_info->sessionid, |
ab5f5e8b | 589 | audit_info->secid); |
4aa2e62c JL |
590 | return err; |
591 | } | |
592 | } | |
593 | } | |
594 | ||
595 | return err; | |
596 | } | |
597 | #else | |
598 | static inline int | |
0e602451 | 599 | xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
4aa2e62c JL |
600 | { |
601 | return 0; | |
602 | } | |
603 | #endif | |
604 | ||
0e602451 | 605 | int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
4aa2e62c | 606 | { |
9e64cc95 | 607 | int i, err = 0, cnt = 0; |
1da177e4 LT |
608 | |
609 | spin_lock_bh(&xfrm_state_lock); | |
0e602451 | 610 | err = xfrm_state_flush_secctx_check(net, proto, audit_info); |
4aa2e62c JL |
611 | if (err) |
612 | goto out; | |
613 | ||
9e64cc95 | 614 | err = -ESRCH; |
0e602451 | 615 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
616 | struct hlist_node *entry; |
617 | struct xfrm_state *x; | |
1da177e4 | 618 | restart: |
0e602451 | 619 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
1da177e4 | 620 | if (!xfrm_state_kern(x) && |
5794708f | 621 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
622 | xfrm_state_hold(x); |
623 | spin_unlock_bh(&xfrm_state_lock); | |
624 | ||
161a09e7 | 625 | err = xfrm_state_delete(x); |
ab5f5e8b JL |
626 | xfrm_audit_state_delete(x, err ? 0 : 1, |
627 | audit_info->loginuid, | |
2532386f | 628 | audit_info->sessionid, |
ab5f5e8b | 629 | audit_info->secid); |
1da177e4 | 630 | xfrm_state_put(x); |
9e64cc95 JHS |
631 | if (!err) |
632 | cnt++; | |
1da177e4 LT |
633 | |
634 | spin_lock_bh(&xfrm_state_lock); | |
635 | goto restart; | |
636 | } | |
637 | } | |
638 | } | |
9e64cc95 JHS |
639 | if (cnt) |
640 | err = 0; | |
4aa2e62c JL |
641 | |
642 | out: | |
1da177e4 | 643 | spin_unlock_bh(&xfrm_state_lock); |
0e602451 | 644 | wake_up(&net->xfrm.km_waitq); |
4aa2e62c | 645 | return err; |
1da177e4 LT |
646 | } |
647 | EXPORT_SYMBOL(xfrm_state_flush); | |
648 | ||
e071041b | 649 | void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) |
28d8909b JHS |
650 | { |
651 | spin_lock_bh(&xfrm_state_lock); | |
e071041b AD |
652 | si->sadcnt = net->xfrm.state_num; |
653 | si->sadhcnt = net->xfrm.state_hmask; | |
28d8909b JHS |
654 | si->sadhmcnt = xfrm_state_hashmax; |
655 | spin_unlock_bh(&xfrm_state_lock); | |
656 | } | |
657 | EXPORT_SYMBOL(xfrm_sad_getinfo); | |
658 | ||
1da177e4 | 659 | static int |
1a898592 | 660 | xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, |
04686013 | 661 | const struct xfrm_tmpl *tmpl, |
8444cf71 TE |
662 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
663 | unsigned short family) | |
1da177e4 LT |
664 | { |
665 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
666 | if (!afinfo) | |
667 | return -1; | |
8444cf71 TE |
668 | afinfo->init_tempsel(&x->sel, fl); |
669 | ||
670 | if (family != tmpl->encap_family) { | |
671 | xfrm_state_put_afinfo(afinfo); | |
672 | afinfo = xfrm_state_get_afinfo(tmpl->encap_family); | |
673 | if (!afinfo) | |
674 | return -1; | |
675 | } | |
676 | afinfo->init_temprop(x, tmpl, daddr, saddr); | |
1da177e4 LT |
677 | xfrm_state_put_afinfo(afinfo); |
678 | return 0; | |
679 | } | |
680 | ||
9aa60088 DM |
681 | static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, |
682 | const xfrm_address_t *daddr, | |
683 | __be32 spi, u8 proto, | |
684 | unsigned short family) | |
edcd5821 | 685 | { |
221df1ed | 686 | unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); |
edcd5821 | 687 | struct xfrm_state *x; |
8f126e37 | 688 | struct hlist_node *entry; |
edcd5821 | 689 | |
221df1ed | 690 | hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) { |
edcd5821 DM |
691 | if (x->props.family != family || |
692 | x->id.spi != spi || | |
1802571b WY |
693 | x->id.proto != proto || |
694 | xfrm_addr_cmp(&x->id.daddr, daddr, family)) | |
edcd5821 DM |
695 | continue; |
696 | ||
3d6acfa7 JHS |
697 | if ((mark & x->mark.m) != x->mark.v) |
698 | continue; | |
edcd5821 DM |
699 | xfrm_state_hold(x); |
700 | return x; | |
701 | } | |
702 | ||
703 | return NULL; | |
704 | } | |
705 | ||
9aa60088 DM |
706 | static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, |
707 | const xfrm_address_t *daddr, | |
708 | const xfrm_address_t *saddr, | |
709 | u8 proto, unsigned short family) | |
edcd5821 | 710 | { |
221df1ed | 711 | unsigned int h = xfrm_src_hash(net, daddr, saddr, family); |
edcd5821 | 712 | struct xfrm_state *x; |
8f126e37 | 713 | struct hlist_node *entry; |
edcd5821 | 714 | |
221df1ed | 715 | hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) { |
edcd5821 | 716 | if (x->props.family != family || |
1802571b WY |
717 | x->id.proto != proto || |
718 | xfrm_addr_cmp(&x->id.daddr, daddr, family) || | |
719 | xfrm_addr_cmp(&x->props.saddr, saddr, family)) | |
edcd5821 DM |
720 | continue; |
721 | ||
3d6acfa7 JHS |
722 | if ((mark & x->mark.m) != x->mark.v) |
723 | continue; | |
edcd5821 DM |
724 | xfrm_state_hold(x); |
725 | return x; | |
726 | } | |
727 | ||
728 | return NULL; | |
729 | } | |
730 | ||
731 | static inline struct xfrm_state * | |
732 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
733 | { | |
221df1ed | 734 | struct net *net = xs_net(x); |
bd55775c | 735 | u32 mark = x->mark.v & x->mark.m; |
221df1ed | 736 | |
edcd5821 | 737 | if (use_spi) |
bd55775c JHS |
738 | return __xfrm_state_lookup(net, mark, &x->id.daddr, |
739 | x->id.spi, x->id.proto, family); | |
edcd5821 | 740 | else |
bd55775c JHS |
741 | return __xfrm_state_lookup_byaddr(net, mark, |
742 | &x->id.daddr, | |
edcd5821 DM |
743 | &x->props.saddr, |
744 | x->id.proto, family); | |
745 | } | |
746 | ||
98806f75 | 747 | static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) |
2fab22f2 PM |
748 | { |
749 | if (have_hash_collision && | |
98806f75 AD |
750 | (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && |
751 | net->xfrm.state_num > net->xfrm.state_hmask) | |
752 | schedule_work(&net->xfrm.state_hash_work); | |
2fab22f2 PM |
753 | } |
754 | ||
08ec9af1 | 755 | static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, |
4a08ab0f | 756 | const struct flowi *fl, unsigned short family, |
08ec9af1 DM |
757 | struct xfrm_state **best, int *acq_in_progress, |
758 | int *error) | |
759 | { | |
760 | /* Resolution logic: | |
761 | * 1. There is a valid state with matching selector. Done. | |
762 | * 2. Valid state with inappropriate selector. Skip. | |
763 | * | |
764 | * Entering area of "sysdeps". | |
765 | * | |
766 | * 3. If state is not valid, selector is temporary, it selects | |
767 | * only session which triggered previous resolution. Key | |
768 | * manager will do something to install a state with proper | |
769 | * selector. | |
770 | */ | |
771 | if (x->km.state == XFRM_STATE_VALID) { | |
772 | if ((x->sel.family && | |
773 | !xfrm_selector_match(&x->sel, fl, x->sel.family)) || | |
774 | !security_xfrm_state_pol_flow_match(x, pol, fl)) | |
775 | return; | |
776 | ||
777 | if (!*best || | |
778 | (*best)->km.dying > x->km.dying || | |
779 | ((*best)->km.dying == x->km.dying && | |
780 | (*best)->curlft.add_time < x->curlft.add_time)) | |
781 | *best = x; | |
782 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
783 | *acq_in_progress = 1; | |
784 | } else if (x->km.state == XFRM_STATE_ERROR || | |
785 | x->km.state == XFRM_STATE_EXPIRED) { | |
786 | if (xfrm_selector_match(&x->sel, fl, x->sel.family) && | |
787 | security_xfrm_state_pol_flow_match(x, pol, fl)) | |
788 | *error = -ESRCH; | |
789 | } | |
790 | } | |
791 | ||
1da177e4 | 792 | struct xfrm_state * |
a716c119 | 793 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, |
b520e9f6 | 794 | const struct flowi *fl, struct xfrm_tmpl *tmpl, |
1da177e4 LT |
795 | struct xfrm_policy *pol, int *err, |
796 | unsigned short family) | |
797 | { | |
08ec9af1 | 798 | static xfrm_address_t saddr_wildcard = { }; |
5447c5e4 | 799 | struct net *net = xp_net(pol); |
6a783c90 | 800 | unsigned int h, h_wildcard; |
8f126e37 | 801 | struct hlist_node *entry; |
37b08e34 | 802 | struct xfrm_state *x, *x0, *to_put; |
1da177e4 LT |
803 | int acquire_in_progress = 0; |
804 | int error = 0; | |
805 | struct xfrm_state *best = NULL; | |
bd55775c | 806 | u32 mark = pol->mark.v & pol->mark.m; |
8444cf71 | 807 | unsigned short encap_family = tmpl->encap_family; |
a716c119 | 808 | |
37b08e34 DM |
809 | to_put = NULL; |
810 | ||
1da177e4 | 811 | spin_lock_bh(&xfrm_state_lock); |
8444cf71 | 812 | h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); |
5447c5e4 | 813 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { |
8444cf71 | 814 | if (x->props.family == encap_family && |
1da177e4 | 815 | x->props.reqid == tmpl->reqid && |
3d6acfa7 | 816 | (mark & x->mark.m) == x->mark.v && |
fbd9a5b4 | 817 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
8444cf71 | 818 | xfrm_state_addr_check(x, daddr, saddr, encap_family) && |
1da177e4 LT |
819 | tmpl->mode == x->props.mode && |
820 | tmpl->id.proto == x->id.proto && | |
08ec9af1 | 821 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) |
1f673c5f | 822 | xfrm_state_look_at(pol, x, fl, encap_family, |
08ec9af1 DM |
823 | &best, &acquire_in_progress, &error); |
824 | } | |
825 | if (best) | |
826 | goto found; | |
827 | ||
8444cf71 | 828 | h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family); |
6a783c90 | 829 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) { |
8444cf71 | 830 | if (x->props.family == encap_family && |
08ec9af1 | 831 | x->props.reqid == tmpl->reqid && |
3d6acfa7 | 832 | (mark & x->mark.m) == x->mark.v && |
08ec9af1 | 833 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
8444cf71 | 834 | xfrm_state_addr_check(x, daddr, saddr, encap_family) && |
08ec9af1 DM |
835 | tmpl->mode == x->props.mode && |
836 | tmpl->id.proto == x->id.proto && | |
837 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) | |
1f673c5f | 838 | xfrm_state_look_at(pol, x, fl, encap_family, |
08ec9af1 | 839 | &best, &acquire_in_progress, &error); |
1da177e4 LT |
840 | } |
841 | ||
08ec9af1 | 842 | found: |
1da177e4 LT |
843 | x = best; |
844 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 845 | if (tmpl->id.spi && |
bd55775c | 846 | (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi, |
8444cf71 | 847 | tmpl->id.proto, encap_family)) != NULL) { |
37b08e34 | 848 | to_put = x0; |
1da177e4 LT |
849 | error = -EEXIST; |
850 | goto out; | |
851 | } | |
5447c5e4 | 852 | x = xfrm_state_alloc(net); |
1da177e4 LT |
853 | if (x == NULL) { |
854 | error = -ENOMEM; | |
855 | goto out; | |
856 | } | |
8444cf71 | 857 | /* Initialize temporary state matching only |
1da177e4 | 858 | * to current session. */ |
8444cf71 | 859 | xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); |
bd55775c | 860 | memcpy(&x->mark, &pol->mark, sizeof(x->mark)); |
1da177e4 | 861 | |
e0d1caa7 VY |
862 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
863 | if (error) { | |
864 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 865 | to_put = x; |
e0d1caa7 VY |
866 | x = NULL; |
867 | goto out; | |
868 | } | |
869 | ||
1da177e4 LT |
870 | if (km_query(x, tmpl, pol) == 0) { |
871 | x->km.state = XFRM_STATE_ACQ; | |
5447c5e4 AD |
872 | list_add(&x->km.all, &net->xfrm.state_all); |
873 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
8444cf71 | 874 | h = xfrm_src_hash(net, daddr, saddr, encap_family); |
5447c5e4 | 875 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); |
1da177e4 | 876 | if (x->id.spi) { |
8444cf71 | 877 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); |
5447c5e4 | 878 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); |
1da177e4 | 879 | } |
b27aeadb | 880 | x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
9e0d57fd | 881 | tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); |
5447c5e4 AD |
882 | net->xfrm.state_num++; |
883 | xfrm_hash_grow_check(net, x->bydst.next != NULL); | |
1da177e4 LT |
884 | } else { |
885 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 886 | to_put = x; |
1da177e4 LT |
887 | x = NULL; |
888 | error = -ESRCH; | |
889 | } | |
890 | } | |
891 | out: | |
892 | if (x) | |
893 | xfrm_state_hold(x); | |
894 | else | |
895 | *err = acquire_in_progress ? -EAGAIN : error; | |
896 | spin_unlock_bh(&xfrm_state_lock); | |
37b08e34 DM |
897 | if (to_put) |
898 | xfrm_state_put(to_put); | |
1da177e4 LT |
899 | return x; |
900 | } | |
901 | ||
628529b6 | 902 | struct xfrm_state * |
bd55775c | 903 | xfrm_stateonly_find(struct net *net, u32 mark, |
5447c5e4 | 904 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
628529b6 JHS |
905 | unsigned short family, u8 mode, u8 proto, u32 reqid) |
906 | { | |
4bda4f25 | 907 | unsigned int h; |
628529b6 JHS |
908 | struct xfrm_state *rx = NULL, *x = NULL; |
909 | struct hlist_node *entry; | |
910 | ||
911 | spin_lock(&xfrm_state_lock); | |
5447c5e4 AD |
912 | h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
913 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
628529b6 JHS |
914 | if (x->props.family == family && |
915 | x->props.reqid == reqid && | |
3d6acfa7 | 916 | (mark & x->mark.m) == x->mark.v && |
628529b6 JHS |
917 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
918 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
919 | mode == x->props.mode && | |
920 | proto == x->id.proto && | |
921 | x->km.state == XFRM_STATE_VALID) { | |
922 | rx = x; | |
923 | break; | |
924 | } | |
925 | } | |
926 | ||
927 | if (rx) | |
928 | xfrm_state_hold(rx); | |
929 | spin_unlock(&xfrm_state_lock); | |
930 | ||
931 | ||
932 | return rx; | |
933 | } | |
934 | EXPORT_SYMBOL(xfrm_stateonly_find); | |
935 | ||
1da177e4 LT |
936 | static void __xfrm_state_insert(struct xfrm_state *x) |
937 | { | |
98806f75 | 938 | struct net *net = xs_net(x); |
a624c108 | 939 | unsigned int h; |
1da177e4 | 940 | |
98806f75 | 941 | list_add(&x->km.all, &net->xfrm.state_all); |
4c563f76 | 942 | |
98806f75 | 943 | h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, |
c1969f29 | 944 | x->props.reqid, x->props.family); |
98806f75 | 945 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); |
1da177e4 | 946 | |
98806f75 AD |
947 | h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); |
948 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
1da177e4 | 949 | |
7b4dc360 | 950 | if (x->id.spi) { |
98806f75 | 951 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, |
6c44e6b7 MN |
952 | x->props.family); |
953 | ||
98806f75 | 954 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); |
6c44e6b7 MN |
955 | } |
956 | ||
9e0d57fd | 957 | tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); |
a47f0ce0 DM |
958 | if (x->replay_maxage) |
959 | mod_timer(&x->rtimer, jiffies + x->replay_maxage); | |
f8cd5488 | 960 | |
98806f75 | 961 | wake_up(&net->xfrm.km_waitq); |
f034b5d4 | 962 | |
98806f75 | 963 | net->xfrm.state_num++; |
f034b5d4 | 964 | |
98806f75 | 965 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
1da177e4 LT |
966 | } |
967 | ||
c7f5ea3a DM |
968 | /* xfrm_state_lock is held */ |
969 | static void __xfrm_state_bump_genids(struct xfrm_state *xnew) | |
970 | { | |
98806f75 | 971 | struct net *net = xs_net(xnew); |
c7f5ea3a DM |
972 | unsigned short family = xnew->props.family; |
973 | u32 reqid = xnew->props.reqid; | |
974 | struct xfrm_state *x; | |
975 | struct hlist_node *entry; | |
976 | unsigned int h; | |
3d6acfa7 | 977 | u32 mark = xnew->mark.v & xnew->mark.m; |
c7f5ea3a | 978 | |
98806f75 AD |
979 | h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); |
980 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
c7f5ea3a DM |
981 | if (x->props.family == family && |
982 | x->props.reqid == reqid && | |
3d6acfa7 | 983 | (mark & x->mark.m) == x->mark.v && |
c1969f29 DM |
984 | !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && |
985 | !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) | |
34996cb9 | 986 | x->genid++; |
c7f5ea3a DM |
987 | } |
988 | } | |
989 | ||
1da177e4 LT |
990 | void xfrm_state_insert(struct xfrm_state *x) |
991 | { | |
992 | spin_lock_bh(&xfrm_state_lock); | |
c7f5ea3a | 993 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
994 | __xfrm_state_insert(x); |
995 | spin_unlock_bh(&xfrm_state_lock); | |
996 | } | |
997 | EXPORT_SYMBOL(xfrm_state_insert); | |
998 | ||
2770834c | 999 | /* xfrm_state_lock is held */ |
bd55775c | 1000 | static struct xfrm_state *__find_acq_core(struct net *net, struct xfrm_mark *m, unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create) |
2770834c | 1001 | { |
5447c5e4 | 1002 | unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
8f126e37 | 1003 | struct hlist_node *entry; |
2770834c | 1004 | struct xfrm_state *x; |
3d6acfa7 | 1005 | u32 mark = m->v & m->m; |
2770834c | 1006 | |
5447c5e4 | 1007 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { |
2770834c DM |
1008 | if (x->props.reqid != reqid || |
1009 | x->props.mode != mode || | |
1010 | x->props.family != family || | |
1011 | x->km.state != XFRM_STATE_ACQ || | |
75e252d9 | 1012 | x->id.spi != 0 || |
1802571b | 1013 | x->id.proto != proto || |
3d6acfa7 | 1014 | (mark & x->mark.m) != x->mark.v || |
1802571b WY |
1015 | xfrm_addr_cmp(&x->id.daddr, daddr, family) || |
1016 | xfrm_addr_cmp(&x->props.saddr, saddr, family)) | |
2770834c DM |
1017 | continue; |
1018 | ||
2770834c DM |
1019 | xfrm_state_hold(x); |
1020 | return x; | |
1021 | } | |
1022 | ||
1023 | if (!create) | |
1024 | return NULL; | |
1025 | ||
5447c5e4 | 1026 | x = xfrm_state_alloc(net); |
2770834c DM |
1027 | if (likely(x)) { |
1028 | switch (family) { | |
1029 | case AF_INET: | |
1030 | x->sel.daddr.a4 = daddr->a4; | |
1031 | x->sel.saddr.a4 = saddr->a4; | |
1032 | x->sel.prefixlen_d = 32; | |
1033 | x->sel.prefixlen_s = 32; | |
1034 | x->props.saddr.a4 = saddr->a4; | |
1035 | x->id.daddr.a4 = daddr->a4; | |
1036 | break; | |
1037 | ||
1038 | case AF_INET6: | |
1039 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
1040 | (struct in6_addr *)daddr); | |
1041 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
1042 | (struct in6_addr *)saddr); | |
1043 | x->sel.prefixlen_d = 128; | |
1044 | x->sel.prefixlen_s = 128; | |
1045 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
1046 | (struct in6_addr *)saddr); | |
1047 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
1048 | (struct in6_addr *)daddr); | |
1049 | break; | |
3ff50b79 | 1050 | } |
2770834c DM |
1051 | |
1052 | x->km.state = XFRM_STATE_ACQ; | |
1053 | x->id.proto = proto; | |
1054 | x->props.family = family; | |
1055 | x->props.mode = mode; | |
1056 | x->props.reqid = reqid; | |
bd55775c JHS |
1057 | x->mark.v = m->v; |
1058 | x->mark.m = m->m; | |
b27aeadb | 1059 | x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
2770834c | 1060 | xfrm_state_hold(x); |
9e0d57fd | 1061 | tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); |
5447c5e4 AD |
1062 | list_add(&x->km.all, &net->xfrm.state_all); |
1063 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
1064 | h = xfrm_src_hash(net, daddr, saddr, family); | |
1065 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
918049f0 | 1066 | |
5447c5e4 | 1067 | net->xfrm.state_num++; |
918049f0 | 1068 | |
5447c5e4 | 1069 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
2770834c DM |
1070 | } |
1071 | ||
1072 | return x; | |
1073 | } | |
1074 | ||
bd55775c | 1075 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); |
1da177e4 LT |
1076 | |
1077 | int xfrm_state_add(struct xfrm_state *x) | |
1078 | { | |
5447c5e4 | 1079 | struct net *net = xs_net(x); |
37b08e34 | 1080 | struct xfrm_state *x1, *to_put; |
1da177e4 LT |
1081 | int family; |
1082 | int err; | |
bd55775c | 1083 | u32 mark = x->mark.v & x->mark.m; |
eb2971b6 | 1084 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
1085 | |
1086 | family = x->props.family; | |
1da177e4 | 1087 | |
37b08e34 DM |
1088 | to_put = NULL; |
1089 | ||
1da177e4 LT |
1090 | spin_lock_bh(&xfrm_state_lock); |
1091 | ||
edcd5821 | 1092 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 | 1093 | if (x1) { |
37b08e34 | 1094 | to_put = x1; |
1da177e4 LT |
1095 | x1 = NULL; |
1096 | err = -EEXIST; | |
1097 | goto out; | |
1098 | } | |
1099 | ||
eb2971b6 | 1100 | if (use_spi && x->km.seq) { |
bd55775c | 1101 | x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); |
75e252d9 JL |
1102 | if (x1 && ((x1->id.proto != x->id.proto) || |
1103 | xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) { | |
37b08e34 | 1104 | to_put = x1; |
1da177e4 LT |
1105 | x1 = NULL; |
1106 | } | |
1107 | } | |
1108 | ||
eb2971b6 | 1109 | if (use_spi && !x1) |
bd55775c JHS |
1110 | x1 = __find_acq_core(net, &x->mark, family, x->props.mode, |
1111 | x->props.reqid, x->id.proto, | |
2770834c | 1112 | &x->id.daddr, &x->props.saddr, 0); |
1da177e4 | 1113 | |
c7f5ea3a | 1114 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
1115 | __xfrm_state_insert(x); |
1116 | err = 0; | |
1117 | ||
1118 | out: | |
1119 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
1120 | |
1121 | if (x1) { | |
1122 | xfrm_state_delete(x1); | |
1123 | xfrm_state_put(x1); | |
1124 | } | |
1125 | ||
37b08e34 DM |
1126 | if (to_put) |
1127 | xfrm_state_put(to_put); | |
1128 | ||
1da177e4 LT |
1129 | return err; |
1130 | } | |
1131 | EXPORT_SYMBOL(xfrm_state_add); | |
1132 | ||
80c9abaa | 1133 | #ifdef CONFIG_XFRM_MIGRATE |
6666351d | 1134 | static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) |
80c9abaa | 1135 | { |
98806f75 | 1136 | struct net *net = xs_net(orig); |
80c9abaa | 1137 | int err = -ENOMEM; |
98806f75 | 1138 | struct xfrm_state *x = xfrm_state_alloc(net); |
80c9abaa | 1139 | if (!x) |
553f9118 | 1140 | goto out; |
80c9abaa SS |
1141 | |
1142 | memcpy(&x->id, &orig->id, sizeof(x->id)); | |
1143 | memcpy(&x->sel, &orig->sel, sizeof(x->sel)); | |
1144 | memcpy(&x->lft, &orig->lft, sizeof(x->lft)); | |
1145 | x->props.mode = orig->props.mode; | |
1146 | x->props.replay_window = orig->props.replay_window; | |
1147 | x->props.reqid = orig->props.reqid; | |
1148 | x->props.family = orig->props.family; | |
1149 | x->props.saddr = orig->props.saddr; | |
1150 | ||
1151 | if (orig->aalg) { | |
4447bb33 | 1152 | x->aalg = xfrm_algo_auth_clone(orig->aalg); |
80c9abaa SS |
1153 | if (!x->aalg) |
1154 | goto error; | |
1155 | } | |
1156 | x->props.aalgo = orig->props.aalgo; | |
1157 | ||
1158 | if (orig->ealg) { | |
1159 | x->ealg = xfrm_algo_clone(orig->ealg); | |
1160 | if (!x->ealg) | |
1161 | goto error; | |
1162 | } | |
1163 | x->props.ealgo = orig->props.ealgo; | |
1164 | ||
1165 | if (orig->calg) { | |
1166 | x->calg = xfrm_algo_clone(orig->calg); | |
1167 | if (!x->calg) | |
1168 | goto error; | |
1169 | } | |
1170 | x->props.calgo = orig->props.calgo; | |
1171 | ||
a716c119 | 1172 | if (orig->encap) { |
80c9abaa SS |
1173 | x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); |
1174 | if (!x->encap) | |
1175 | goto error; | |
1176 | } | |
1177 | ||
1178 | if (orig->coaddr) { | |
1179 | x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), | |
1180 | GFP_KERNEL); | |
1181 | if (!x->coaddr) | |
1182 | goto error; | |
1183 | } | |
1184 | ||
bd55775c JHS |
1185 | memcpy(&x->mark, &orig->mark, sizeof(x->mark)); |
1186 | ||
80c9abaa SS |
1187 | err = xfrm_init_state(x); |
1188 | if (err) | |
1189 | goto error; | |
1190 | ||
1191 | x->props.flags = orig->props.flags; | |
1192 | ||
1193 | x->curlft.add_time = orig->curlft.add_time; | |
1194 | x->km.state = orig->km.state; | |
1195 | x->km.seq = orig->km.seq; | |
1196 | ||
1197 | return x; | |
1198 | ||
1199 | error: | |
553f9118 HX |
1200 | xfrm_state_put(x); |
1201 | out: | |
80c9abaa SS |
1202 | if (errp) |
1203 | *errp = err; | |
80c9abaa SS |
1204 | return NULL; |
1205 | } | |
80c9abaa SS |
1206 | |
1207 | /* xfrm_state_lock is held */ | |
1208 | struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) | |
1209 | { | |
1210 | unsigned int h; | |
1211 | struct xfrm_state *x; | |
1212 | struct hlist_node *entry; | |
1213 | ||
1214 | if (m->reqid) { | |
64d0cd00 | 1215 | h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1216 | m->reqid, m->old_family); |
73d189dc | 1217 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { |
80c9abaa SS |
1218 | if (x->props.mode != m->mode || |
1219 | x->id.proto != m->proto) | |
1220 | continue; | |
1221 | if (m->reqid && x->props.reqid != m->reqid) | |
1222 | continue; | |
1223 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1224 | m->old_family) || | |
1225 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1226 | m->old_family)) | |
1227 | continue; | |
1228 | xfrm_state_hold(x); | |
1229 | return x; | |
1230 | } | |
1231 | } else { | |
64d0cd00 | 1232 | h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1233 | m->old_family); |
d320bbb3 | 1234 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) { |
80c9abaa SS |
1235 | if (x->props.mode != m->mode || |
1236 | x->id.proto != m->proto) | |
1237 | continue; | |
1238 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1239 | m->old_family) || | |
1240 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1241 | m->old_family)) | |
1242 | continue; | |
1243 | xfrm_state_hold(x); | |
1244 | return x; | |
1245 | } | |
1246 | } | |
1247 | ||
a716c119 | 1248 | return NULL; |
80c9abaa SS |
1249 | } |
1250 | EXPORT_SYMBOL(xfrm_migrate_state_find); | |
1251 | ||
1252 | struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, | |
1253 | struct xfrm_migrate *m) | |
1254 | { | |
1255 | struct xfrm_state *xc; | |
1256 | int err; | |
1257 | ||
1258 | xc = xfrm_state_clone(x, &err); | |
1259 | if (!xc) | |
1260 | return NULL; | |
1261 | ||
1262 | memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); | |
1263 | memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); | |
1264 | ||
1265 | /* add state */ | |
1266 | if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) { | |
1267 | /* a care is needed when the destination address of the | |
1268 | state is to be updated as it is a part of triplet */ | |
1269 | xfrm_state_insert(xc); | |
1270 | } else { | |
1271 | if ((err = xfrm_state_add(xc)) < 0) | |
1272 | goto error; | |
1273 | } | |
1274 | ||
1275 | return xc; | |
1276 | error: | |
78347c8c | 1277 | xfrm_state_put(xc); |
80c9abaa SS |
1278 | return NULL; |
1279 | } | |
1280 | EXPORT_SYMBOL(xfrm_state_migrate); | |
1281 | #endif | |
1282 | ||
1da177e4 LT |
1283 | int xfrm_state_update(struct xfrm_state *x) |
1284 | { | |
37b08e34 | 1285 | struct xfrm_state *x1, *to_put; |
1da177e4 | 1286 | int err; |
eb2971b6 | 1287 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 1288 | |
37b08e34 DM |
1289 | to_put = NULL; |
1290 | ||
1da177e4 | 1291 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 1292 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
1293 | |
1294 | err = -ESRCH; | |
1295 | if (!x1) | |
1296 | goto out; | |
1297 | ||
1298 | if (xfrm_state_kern(x1)) { | |
37b08e34 | 1299 | to_put = x1; |
1da177e4 LT |
1300 | err = -EEXIST; |
1301 | goto out; | |
1302 | } | |
1303 | ||
1304 | if (x1->km.state == XFRM_STATE_ACQ) { | |
1305 | __xfrm_state_insert(x); | |
1306 | x = NULL; | |
1307 | } | |
1308 | err = 0; | |
1309 | ||
1310 | out: | |
1311 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 | 1312 | |
37b08e34 DM |
1313 | if (to_put) |
1314 | xfrm_state_put(to_put); | |
1315 | ||
1da177e4 LT |
1316 | if (err) |
1317 | return err; | |
1318 | ||
1319 | if (!x) { | |
1320 | xfrm_state_delete(x1); | |
1321 | xfrm_state_put(x1); | |
1322 | return 0; | |
1323 | } | |
1324 | ||
1325 | err = -EINVAL; | |
1326 | spin_lock_bh(&x1->lock); | |
1327 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
1328 | if (x->encap && x1->encap) | |
1329 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
1330 | if (x->coaddr && x1->coaddr) { |
1331 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
1332 | } | |
1333 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
1334 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
1335 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
1336 | x1->km.dying = 0; | |
1337 | ||
9e0d57fd | 1338 | tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); |
1da177e4 LT |
1339 | if (x1->curlft.use_time) |
1340 | xfrm_state_check_expire(x1); | |
1341 | ||
1342 | err = 0; | |
1343 | } | |
1344 | spin_unlock_bh(&x1->lock); | |
1345 | ||
1346 | xfrm_state_put(x1); | |
1347 | ||
1348 | return err; | |
1349 | } | |
1350 | EXPORT_SYMBOL(xfrm_state_update); | |
1351 | ||
1352 | int xfrm_state_check_expire(struct xfrm_state *x) | |
1353 | { | |
1354 | if (!x->curlft.use_time) | |
9d729f72 | 1355 | x->curlft.use_time = get_seconds(); |
1da177e4 LT |
1356 | |
1357 | if (x->km.state != XFRM_STATE_VALID) | |
1358 | return -EINVAL; | |
1359 | ||
1360 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
1361 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 1362 | x->km.state = XFRM_STATE_EXPIRED; |
9e0d57fd | 1363 | tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL); |
1da177e4 LT |
1364 | return -EINVAL; |
1365 | } | |
1366 | ||
1367 | if (!x->km.dying && | |
1368 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
1369 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
1370 | x->km.dying = 1; | |
53bc6b4d | 1371 | km_state_expired(x, 0, 0); |
4666faab | 1372 | } |
1da177e4 LT |
1373 | return 0; |
1374 | } | |
1375 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
1376 | ||
1da177e4 | 1377 | struct xfrm_state * |
bd55775c JHS |
1378 | xfrm_state_lookup(struct net *net, u32 mark, xfrm_address_t *daddr, __be32 spi, |
1379 | u8 proto, unsigned short family) | |
1da177e4 LT |
1380 | { |
1381 | struct xfrm_state *x; | |
1da177e4 LT |
1382 | |
1383 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1384 | x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); |
1da177e4 | 1385 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
1386 | return x; |
1387 | } | |
1388 | EXPORT_SYMBOL(xfrm_state_lookup); | |
1389 | ||
1390 | struct xfrm_state * | |
bd55775c | 1391 | xfrm_state_lookup_byaddr(struct net *net, u32 mark, |
221df1ed | 1392 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
eb2971b6 MN |
1393 | u8 proto, unsigned short family) |
1394 | { | |
1395 | struct xfrm_state *x; | |
eb2971b6 MN |
1396 | |
1397 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1398 | x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); |
eb2971b6 | 1399 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
1400 | return x; |
1401 | } | |
1402 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
1403 | ||
1404 | struct xfrm_state * | |
bd55775c | 1405 | xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto, |
a716c119 | 1406 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
1407 | int create, unsigned short family) |
1408 | { | |
1409 | struct xfrm_state *x; | |
1da177e4 LT |
1410 | |
1411 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1412 | x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 1413 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 1414 | |
1da177e4 LT |
1415 | return x; |
1416 | } | |
1417 | EXPORT_SYMBOL(xfrm_find_acq); | |
1418 | ||
41a49cc3 MN |
1419 | #ifdef CONFIG_XFRM_SUB_POLICY |
1420 | int | |
1421 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
1422 | unsigned short family) | |
1423 | { | |
1424 | int err = 0; | |
1425 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1426 | if (!afinfo) | |
1427 | return -EAFNOSUPPORT; | |
1428 | ||
1429 | spin_lock_bh(&xfrm_state_lock); | |
1430 | if (afinfo->tmpl_sort) | |
1431 | err = afinfo->tmpl_sort(dst, src, n); | |
1432 | spin_unlock_bh(&xfrm_state_lock); | |
1433 | xfrm_state_put_afinfo(afinfo); | |
1434 | return err; | |
1435 | } | |
1436 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
1437 | ||
1438 | int | |
1439 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
1440 | unsigned short family) | |
1441 | { | |
1442 | int err = 0; | |
1443 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1444 | if (!afinfo) | |
1445 | return -EAFNOSUPPORT; | |
1446 | ||
1447 | spin_lock_bh(&xfrm_state_lock); | |
1448 | if (afinfo->state_sort) | |
1449 | err = afinfo->state_sort(dst, src, n); | |
1450 | spin_unlock_bh(&xfrm_state_lock); | |
1451 | xfrm_state_put_afinfo(afinfo); | |
1452 | return err; | |
1453 | } | |
1454 | EXPORT_SYMBOL(xfrm_state_sort); | |
1455 | #endif | |
1456 | ||
1da177e4 LT |
1457 | /* Silly enough, but I'm lazy to build resolution list */ |
1458 | ||
bd55775c | 1459 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) |
1da177e4 LT |
1460 | { |
1461 | int i; | |
1da177e4 | 1462 | |
5447c5e4 | 1463 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
1464 | struct hlist_node *entry; |
1465 | struct xfrm_state *x; | |
1466 | ||
5447c5e4 | 1467 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
8f126e37 | 1468 | if (x->km.seq == seq && |
3d6acfa7 | 1469 | (mark & x->mark.m) == x->mark.v && |
8f126e37 | 1470 | x->km.state == XFRM_STATE_ACQ) { |
1da177e4 LT |
1471 | xfrm_state_hold(x); |
1472 | return x; | |
1473 | } | |
1474 | } | |
1475 | } | |
1476 | return NULL; | |
1477 | } | |
1478 | ||
bd55775c | 1479 | struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) |
1da177e4 LT |
1480 | { |
1481 | struct xfrm_state *x; | |
1482 | ||
1483 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1484 | x = __xfrm_find_acq_byseq(net, mark, seq); |
1da177e4 LT |
1485 | spin_unlock_bh(&xfrm_state_lock); |
1486 | return x; | |
1487 | } | |
1488 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1489 | ||
1490 | u32 xfrm_get_acqseq(void) | |
1491 | { | |
1492 | u32 res; | |
6836b9bd | 1493 | static atomic_t acqseq; |
1494 | ||
1495 | do { | |
1496 | res = atomic_inc_return(&acqseq); | |
1497 | } while (!res); | |
1da177e4 | 1498 | |
1da177e4 LT |
1499 | return res; |
1500 | } | |
1501 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1502 | ||
658b219e | 1503 | int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) |
1da177e4 | 1504 | { |
221df1ed | 1505 | struct net *net = xs_net(x); |
f034b5d4 | 1506 | unsigned int h; |
1da177e4 | 1507 | struct xfrm_state *x0; |
658b219e HX |
1508 | int err = -ENOENT; |
1509 | __be32 minspi = htonl(low); | |
1510 | __be32 maxspi = htonl(high); | |
bd55775c | 1511 | u32 mark = x->mark.v & x->mark.m; |
1da177e4 | 1512 | |
658b219e HX |
1513 | spin_lock_bh(&x->lock); |
1514 | if (x->km.state == XFRM_STATE_DEAD) | |
1515 | goto unlock; | |
1516 | ||
1517 | err = 0; | |
1da177e4 | 1518 | if (x->id.spi) |
658b219e HX |
1519 | goto unlock; |
1520 | ||
1521 | err = -ENOENT; | |
1da177e4 LT |
1522 | |
1523 | if (minspi == maxspi) { | |
bd55775c | 1524 | x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); |
1da177e4 LT |
1525 | if (x0) { |
1526 | xfrm_state_put(x0); | |
658b219e | 1527 | goto unlock; |
1da177e4 LT |
1528 | } |
1529 | x->id.spi = minspi; | |
1530 | } else { | |
1531 | u32 spi = 0; | |
26977b4e AV |
1532 | for (h=0; h<high-low+1; h++) { |
1533 | spi = low + net_random()%(high-low+1); | |
bd55775c | 1534 | x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
1da177e4 LT |
1535 | if (x0 == NULL) { |
1536 | x->id.spi = htonl(spi); | |
1537 | break; | |
1538 | } | |
1539 | xfrm_state_put(x0); | |
1540 | } | |
1541 | } | |
1542 | if (x->id.spi) { | |
1543 | spin_lock_bh(&xfrm_state_lock); | |
12604d8a AD |
1544 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); |
1545 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 1546 | spin_unlock_bh(&xfrm_state_lock); |
658b219e HX |
1547 | |
1548 | err = 0; | |
1da177e4 | 1549 | } |
658b219e HX |
1550 | |
1551 | unlock: | |
1552 | spin_unlock_bh(&x->lock); | |
1553 | ||
1554 | return err; | |
1da177e4 LT |
1555 | } |
1556 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1557 | ||
284fa7da | 1558 | int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, |
4c563f76 | 1559 | int (*func)(struct xfrm_state *, int, void*), |
1da177e4 LT |
1560 | void *data) |
1561 | { | |
12a169e7 HX |
1562 | struct xfrm_state *state; |
1563 | struct xfrm_state_walk *x; | |
1da177e4 LT |
1564 | int err = 0; |
1565 | ||
12a169e7 | 1566 | if (walk->seq != 0 && list_empty(&walk->all)) |
4c563f76 TT |
1567 | return 0; |
1568 | ||
1da177e4 | 1569 | spin_lock_bh(&xfrm_state_lock); |
12a169e7 | 1570 | if (list_empty(&walk->all)) |
284fa7da | 1571 | x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); |
12a169e7 HX |
1572 | else |
1573 | x = list_entry(&walk->all, struct xfrm_state_walk, all); | |
284fa7da | 1574 | list_for_each_entry_from(x, &net->xfrm.state_all, all) { |
12a169e7 | 1575 | if (x->state == XFRM_STATE_DEAD) |
4c563f76 | 1576 | continue; |
12a169e7 HX |
1577 | state = container_of(x, struct xfrm_state, km); |
1578 | if (!xfrm_id_proto_match(state->id.proto, walk->proto)) | |
4c563f76 | 1579 | continue; |
12a169e7 HX |
1580 | err = func(state, walk->seq, data); |
1581 | if (err) { | |
1582 | list_move_tail(&walk->all, &x->all); | |
1583 | goto out; | |
1da177e4 | 1584 | } |
12a169e7 | 1585 | walk->seq++; |
1da177e4 | 1586 | } |
12a169e7 | 1587 | if (walk->seq == 0) { |
1da177e4 LT |
1588 | err = -ENOENT; |
1589 | goto out; | |
1590 | } | |
12a169e7 | 1591 | list_del_init(&walk->all); |
1da177e4 LT |
1592 | out: |
1593 | spin_unlock_bh(&xfrm_state_lock); | |
1594 | return err; | |
1595 | } | |
1596 | EXPORT_SYMBOL(xfrm_state_walk); | |
1597 | ||
5c182458 HX |
1598 | void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) |
1599 | { | |
12a169e7 | 1600 | INIT_LIST_HEAD(&walk->all); |
5c182458 | 1601 | walk->proto = proto; |
12a169e7 HX |
1602 | walk->state = XFRM_STATE_DEAD; |
1603 | walk->seq = 0; | |
5c182458 HX |
1604 | } |
1605 | EXPORT_SYMBOL(xfrm_state_walk_init); | |
1606 | ||
abb81c4f HX |
1607 | void xfrm_state_walk_done(struct xfrm_state_walk *walk) |
1608 | { | |
12a169e7 | 1609 | if (list_empty(&walk->all)) |
5c182458 | 1610 | return; |
5c182458 | 1611 | |
12a169e7 HX |
1612 | spin_lock_bh(&xfrm_state_lock); |
1613 | list_del(&walk->all); | |
7d0b591c | 1614 | spin_unlock_bh(&xfrm_state_lock); |
abb81c4f HX |
1615 | } |
1616 | EXPORT_SYMBOL(xfrm_state_walk_done); | |
1617 | ||
f8cd5488 JHS |
1618 | |
1619 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
1620 | { | |
1621 | struct km_event c; | |
1622 | /* we send notify messages in case | |
1623 | * 1. we updated on of the sequence numbers, and the seqno difference | |
1624 | * is at least x->replay_maxdiff, in this case we also update the | |
1625 | * timeout of our timer function | |
1626 | * 2. if x->replay_maxage has elapsed since last update, | |
1627 | * and there were changes | |
1628 | * | |
1629 | * The state structure must be locked! | |
1630 | */ | |
1631 | ||
1632 | switch (event) { | |
1633 | case XFRM_REPLAY_UPDATE: | |
1634 | if (x->replay_maxdiff && | |
1635 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
1636 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
1637 | if (x->xflags & XFRM_TIME_DEFER) | |
1638 | event = XFRM_REPLAY_TIMEOUT; | |
1639 | else | |
1640 | return; | |
1641 | } | |
f8cd5488 JHS |
1642 | |
1643 | break; | |
1644 | ||
1645 | case XFRM_REPLAY_TIMEOUT: | |
1646 | if ((x->replay.seq == x->preplay.seq) && | |
1647 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1648 | (x->replay.oseq == x->preplay.oseq)) { |
1649 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1650 | return; |
2717096a | 1651 | } |
f8cd5488 JHS |
1652 | |
1653 | break; | |
1654 | } | |
1655 | ||
1656 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1657 | c.event = XFRM_MSG_NEWAE; | |
1658 | c.data.aevent = event; | |
1659 | km_state_notify(x, &c); | |
1660 | ||
f8cd5488 | 1661 | if (x->replay_maxage && |
a47f0ce0 | 1662 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
2717096a | 1663 | x->xflags &= ~XFRM_TIME_DEFER; |
f8cd5488 JHS |
1664 | } |
1665 | ||
1666 | static void xfrm_replay_timer_handler(unsigned long data) | |
1667 | { | |
1668 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1669 | ||
1670 | spin_lock(&x->lock); | |
1671 | ||
2717096a | 1672 | if (x->km.state == XFRM_STATE_VALID) { |
a6483b79 | 1673 | if (xfrm_aevent_is_on(xs_net(x))) |
2717096a JHS |
1674 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); |
1675 | else | |
1676 | x->xflags |= XFRM_TIME_DEFER; | |
1677 | } | |
f8cd5488 JHS |
1678 | |
1679 | spin_unlock(&x->lock); | |
1680 | } | |
1681 | ||
afeb14b4 PM |
1682 | int xfrm_replay_check(struct xfrm_state *x, |
1683 | struct sk_buff *skb, __be32 net_seq) | |
1da177e4 LT |
1684 | { |
1685 | u32 diff; | |
a252cc23 | 1686 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1687 | |
1688 | if (unlikely(seq == 0)) | |
afeb14b4 | 1689 | goto err; |
1da177e4 LT |
1690 | |
1691 | if (likely(seq > x->replay.seq)) | |
1692 | return 0; | |
1693 | ||
1694 | diff = x->replay.seq - seq; | |
4c4d51a7 HX |
1695 | if (diff >= min_t(unsigned int, x->props.replay_window, |
1696 | sizeof(x->replay.bitmap) * 8)) { | |
1da177e4 | 1697 | x->stats.replay_window++; |
afeb14b4 | 1698 | goto err; |
1da177e4 LT |
1699 | } |
1700 | ||
1701 | if (x->replay.bitmap & (1U << diff)) { | |
1702 | x->stats.replay++; | |
afeb14b4 | 1703 | goto err; |
1da177e4 LT |
1704 | } |
1705 | return 0; | |
afeb14b4 PM |
1706 | |
1707 | err: | |
1708 | xfrm_audit_state_replay(x, skb, net_seq); | |
1709 | return -EINVAL; | |
1da177e4 | 1710 | } |
1da177e4 | 1711 | |
61f4627b | 1712 | void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq) |
1da177e4 LT |
1713 | { |
1714 | u32 diff; | |
61f4627b | 1715 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1716 | |
1717 | if (seq > x->replay.seq) { | |
1718 | diff = seq - x->replay.seq; | |
1719 | if (diff < x->props.replay_window) | |
1720 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1721 | else | |
1722 | x->replay.bitmap = 1; | |
1723 | x->replay.seq = seq; | |
1724 | } else { | |
1725 | diff = x->replay.seq - seq; | |
1726 | x->replay.bitmap |= (1U << diff); | |
1727 | } | |
f8cd5488 | 1728 | |
a6483b79 | 1729 | if (xfrm_aevent_is_on(xs_net(x))) |
f8cd5488 | 1730 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); |
1da177e4 | 1731 | } |
1da177e4 | 1732 | |
df01812e | 1733 | static LIST_HEAD(xfrm_km_list); |
1da177e4 LT |
1734 | static DEFINE_RWLOCK(xfrm_km_lock); |
1735 | ||
214e005b | 1736 | void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) |
1da177e4 LT |
1737 | { |
1738 | struct xfrm_mgr *km; | |
1739 | ||
26b15dad JHS |
1740 | read_lock(&xfrm_km_lock); |
1741 | list_for_each_entry(km, &xfrm_km_list, list) | |
1742 | if (km->notify_policy) | |
1743 | km->notify_policy(xp, dir, c); | |
1744 | read_unlock(&xfrm_km_lock); | |
1745 | } | |
1da177e4 | 1746 | |
214e005b | 1747 | void km_state_notify(struct xfrm_state *x, const struct km_event *c) |
26b15dad JHS |
1748 | { |
1749 | struct xfrm_mgr *km; | |
1da177e4 LT |
1750 | read_lock(&xfrm_km_lock); |
1751 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1752 | if (km->notify) |
1753 | km->notify(x, c); | |
1da177e4 | 1754 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1755 | } |
1756 | ||
1757 | EXPORT_SYMBOL(km_policy_notify); | |
1758 | EXPORT_SYMBOL(km_state_notify); | |
1759 | ||
53bc6b4d | 1760 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad | 1761 | { |
98806f75 | 1762 | struct net *net = xs_net(x); |
26b15dad JHS |
1763 | struct km_event c; |
1764 | ||
bf08867f | 1765 | c.data.hard = hard; |
53bc6b4d | 1766 | c.pid = pid; |
f60f6b8f | 1767 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1768 | km_state_notify(x, &c); |
1da177e4 LT |
1769 | |
1770 | if (hard) | |
98806f75 | 1771 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
1772 | } |
1773 | ||
53bc6b4d | 1774 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1775 | /* |
1776 | * We send to all registered managers regardless of failure | |
1777 | * We are happy with one success | |
1778 | */ | |
980ebd25 | 1779 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1780 | { |
26b15dad | 1781 | int err = -EINVAL, acqret; |
1da177e4 LT |
1782 | struct xfrm_mgr *km; |
1783 | ||
1784 | read_lock(&xfrm_km_lock); | |
1785 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1786 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1787 | if (!acqret) | |
1788 | err = acqret; | |
1da177e4 LT |
1789 | } |
1790 | read_unlock(&xfrm_km_lock); | |
1791 | return err; | |
1792 | } | |
980ebd25 | 1793 | EXPORT_SYMBOL(km_query); |
1da177e4 | 1794 | |
5d36b180 | 1795 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) |
1da177e4 LT |
1796 | { |
1797 | int err = -EINVAL; | |
1798 | struct xfrm_mgr *km; | |
1799 | ||
1800 | read_lock(&xfrm_km_lock); | |
1801 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1802 | if (km->new_mapping) | |
1803 | err = km->new_mapping(x, ipaddr, sport); | |
1804 | if (!err) | |
1805 | break; | |
1806 | } | |
1807 | read_unlock(&xfrm_km_lock); | |
1808 | return err; | |
1809 | } | |
1810 | EXPORT_SYMBOL(km_new_mapping); | |
1811 | ||
6c5c8ca7 | 1812 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1813 | { |
98806f75 | 1814 | struct net *net = xp_net(pol); |
26b15dad | 1815 | struct km_event c; |
1da177e4 | 1816 | |
bf08867f | 1817 | c.data.hard = hard; |
6c5c8ca7 | 1818 | c.pid = pid; |
f60f6b8f | 1819 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1820 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1821 | |
1822 | if (hard) | |
98806f75 | 1823 | wake_up(&net->xfrm.km_waitq); |
1da177e4 | 1824 | } |
a70fcb0b | 1825 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1826 | |
2d60abc2 | 1827 | #ifdef CONFIG_XFRM_MIGRATE |
183cad12 DM |
1828 | int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
1829 | const struct xfrm_migrate *m, int num_migrate, | |
1830 | const struct xfrm_kmaddress *k) | |
80c9abaa SS |
1831 | { |
1832 | int err = -EINVAL; | |
1833 | int ret; | |
1834 | struct xfrm_mgr *km; | |
1835 | ||
1836 | read_lock(&xfrm_km_lock); | |
1837 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1838 | if (km->migrate) { | |
13c1d189 | 1839 | ret = km->migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
1840 | if (!ret) |
1841 | err = ret; | |
1842 | } | |
1843 | } | |
1844 | read_unlock(&xfrm_km_lock); | |
1845 | return err; | |
1846 | } | |
1847 | EXPORT_SYMBOL(km_migrate); | |
2d60abc2 | 1848 | #endif |
80c9abaa | 1849 | |
db983c11 | 1850 | int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
97a64b45 MN |
1851 | { |
1852 | int err = -EINVAL; | |
1853 | int ret; | |
1854 | struct xfrm_mgr *km; | |
1855 | ||
1856 | read_lock(&xfrm_km_lock); | |
1857 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1858 | if (km->report) { | |
db983c11 | 1859 | ret = km->report(net, proto, sel, addr); |
97a64b45 MN |
1860 | if (!ret) |
1861 | err = ret; | |
1862 | } | |
1863 | } | |
1864 | read_unlock(&xfrm_km_lock); | |
1865 | return err; | |
1866 | } | |
1867 | EXPORT_SYMBOL(km_report); | |
1868 | ||
1da177e4 LT |
1869 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1870 | { | |
1871 | int err; | |
1872 | u8 *data; | |
1873 | struct xfrm_mgr *km; | |
1874 | struct xfrm_policy *pol = NULL; | |
1875 | ||
1876 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1877 | return -EMSGSIZE; | |
1878 | ||
1879 | data = kmalloc(optlen, GFP_KERNEL); | |
1880 | if (!data) | |
1881 | return -ENOMEM; | |
1882 | ||
1883 | err = -EFAULT; | |
1884 | if (copy_from_user(data, optval, optlen)) | |
1885 | goto out; | |
1886 | ||
1887 | err = -EINVAL; | |
1888 | read_lock(&xfrm_km_lock); | |
1889 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1890 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1891 | optlen, &err); |
1892 | if (err >= 0) | |
1893 | break; | |
1894 | } | |
1895 | read_unlock(&xfrm_km_lock); | |
1896 | ||
1897 | if (err >= 0) { | |
1898 | xfrm_sk_policy_insert(sk, err, pol); | |
1899 | xfrm_pol_put(pol); | |
1900 | err = 0; | |
1901 | } | |
1902 | ||
1903 | out: | |
1904 | kfree(data); | |
1905 | return err; | |
1906 | } | |
1907 | EXPORT_SYMBOL(xfrm_user_policy); | |
1908 | ||
1909 | int xfrm_register_km(struct xfrm_mgr *km) | |
1910 | { | |
1911 | write_lock_bh(&xfrm_km_lock); | |
1912 | list_add_tail(&km->list, &xfrm_km_list); | |
1913 | write_unlock_bh(&xfrm_km_lock); | |
1914 | return 0; | |
1915 | } | |
1916 | EXPORT_SYMBOL(xfrm_register_km); | |
1917 | ||
1918 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1919 | { | |
1920 | write_lock_bh(&xfrm_km_lock); | |
1921 | list_del(&km->list); | |
1922 | write_unlock_bh(&xfrm_km_lock); | |
1923 | return 0; | |
1924 | } | |
1925 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1926 | ||
1927 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1928 | { | |
1929 | int err = 0; | |
1930 | if (unlikely(afinfo == NULL)) | |
1931 | return -EINVAL; | |
1932 | if (unlikely(afinfo->family >= NPROTO)) | |
1933 | return -EAFNOSUPPORT; | |
f3111502 | 1934 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1935 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1936 | err = -ENOBUFS; | |
edcd5821 | 1937 | else |
1da177e4 | 1938 | xfrm_state_afinfo[afinfo->family] = afinfo; |
f3111502 | 1939 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1940 | return err; |
1941 | } | |
1942 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1943 | ||
1944 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1945 | { | |
1946 | int err = 0; | |
1947 | if (unlikely(afinfo == NULL)) | |
1948 | return -EINVAL; | |
1949 | if (unlikely(afinfo->family >= NPROTO)) | |
1950 | return -EAFNOSUPPORT; | |
f3111502 | 1951 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1952 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1953 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1954 | err = -EINVAL; | |
edcd5821 | 1955 | else |
1da177e4 | 1956 | xfrm_state_afinfo[afinfo->family] = NULL; |
1da177e4 | 1957 | } |
f3111502 | 1958 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1959 | return err; |
1960 | } | |
1961 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1962 | ||
17c2a42a | 1963 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) |
1da177e4 LT |
1964 | { |
1965 | struct xfrm_state_afinfo *afinfo; | |
1966 | if (unlikely(family >= NPROTO)) | |
1967 | return NULL; | |
1968 | read_lock(&xfrm_state_afinfo_lock); | |
1969 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1970 | if (unlikely(!afinfo)) |
1971 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1972 | return afinfo; |
1973 | } | |
1974 | ||
17c2a42a | 1975 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) |
9a429c49 | 1976 | __releases(xfrm_state_afinfo_lock) |
1da177e4 | 1977 | { |
546be240 | 1978 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1979 | } |
1980 | ||
1981 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1982 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1983 | { | |
1984 | if (x->tunnel) { | |
1985 | struct xfrm_state *t = x->tunnel; | |
1986 | ||
1987 | if (atomic_read(&t->tunnel_users) == 2) | |
1988 | xfrm_state_delete(t); | |
1989 | atomic_dec(&t->tunnel_users); | |
1990 | xfrm_state_put(t); | |
1991 | x->tunnel = NULL; | |
1992 | } | |
1993 | } | |
1994 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1995 | ||
1996 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) | |
1997 | { | |
c5c25238 | 1998 | int res; |
1da177e4 | 1999 | |
c5c25238 PM |
2000 | spin_lock_bh(&x->lock); |
2001 | if (x->km.state == XFRM_STATE_VALID && | |
2002 | x->type && x->type->get_mtu) | |
2003 | res = x->type->get_mtu(x, mtu); | |
2004 | else | |
28121617 | 2005 | res = mtu - x->props.header_len; |
c5c25238 | 2006 | spin_unlock_bh(&x->lock); |
1da177e4 LT |
2007 | return res; |
2008 | } | |
2009 | ||
72cb6962 HX |
2010 | int xfrm_init_state(struct xfrm_state *x) |
2011 | { | |
d094cd83 | 2012 | struct xfrm_state_afinfo *afinfo; |
df9dcb45 | 2013 | struct xfrm_mode *inner_mode; |
d094cd83 | 2014 | int family = x->props.family; |
72cb6962 HX |
2015 | int err; |
2016 | ||
d094cd83 HX |
2017 | err = -EAFNOSUPPORT; |
2018 | afinfo = xfrm_state_get_afinfo(family); | |
2019 | if (!afinfo) | |
2020 | goto error; | |
2021 | ||
2022 | err = 0; | |
2023 | if (afinfo->init_flags) | |
2024 | err = afinfo->init_flags(x); | |
2025 | ||
2026 | xfrm_state_put_afinfo(afinfo); | |
2027 | ||
2028 | if (err) | |
2029 | goto error; | |
2030 | ||
2031 | err = -EPROTONOSUPPORT; | |
13996378 | 2032 | |
df9dcb45 KM |
2033 | if (x->sel.family != AF_UNSPEC) { |
2034 | inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); | |
2035 | if (inner_mode == NULL) | |
2036 | goto error; | |
2037 | ||
2038 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && | |
2039 | family != x->sel.family) { | |
2040 | xfrm_put_mode(inner_mode); | |
2041 | goto error; | |
2042 | } | |
2043 | ||
2044 | x->inner_mode = inner_mode; | |
2045 | } else { | |
2046 | struct xfrm_mode *inner_mode_iaf; | |
d81d2285 | 2047 | int iafamily = AF_INET; |
df9dcb45 | 2048 | |
d81d2285 | 2049 | inner_mode = xfrm_get_mode(x->props.mode, x->props.family); |
df9dcb45 KM |
2050 | if (inner_mode == NULL) |
2051 | goto error; | |
2052 | ||
2053 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
2054 | xfrm_put_mode(inner_mode); | |
2055 | goto error; | |
2056 | } | |
d81d2285 | 2057 | x->inner_mode = inner_mode; |
df9dcb45 | 2058 | |
d81d2285 MW |
2059 | if (x->props.family == AF_INET) |
2060 | iafamily = AF_INET6; | |
df9dcb45 | 2061 | |
d81d2285 MW |
2062 | inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); |
2063 | if (inner_mode_iaf) { | |
2064 | if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) | |
2065 | x->inner_mode_iaf = inner_mode_iaf; | |
2066 | else | |
2067 | xfrm_put_mode(inner_mode_iaf); | |
df9dcb45 KM |
2068 | } |
2069 | } | |
13996378 | 2070 | |
d094cd83 | 2071 | x->type = xfrm_get_type(x->id.proto, family); |
72cb6962 HX |
2072 | if (x->type == NULL) |
2073 | goto error; | |
2074 | ||
2075 | err = x->type->init_state(x); | |
2076 | if (err) | |
2077 | goto error; | |
2078 | ||
13996378 HX |
2079 | x->outer_mode = xfrm_get_mode(x->props.mode, family); |
2080 | if (x->outer_mode == NULL) | |
b59f45d0 HX |
2081 | goto error; |
2082 | ||
72cb6962 HX |
2083 | x->km.state = XFRM_STATE_VALID; |
2084 | ||
2085 | error: | |
2086 | return err; | |
2087 | } | |
2088 | ||
2089 | EXPORT_SYMBOL(xfrm_init_state); | |
a716c119 | 2090 | |
d62ddc21 | 2091 | int __net_init xfrm_state_init(struct net *net) |
1da177e4 | 2092 | { |
f034b5d4 DM |
2093 | unsigned int sz; |
2094 | ||
9d4139c7 AD |
2095 | INIT_LIST_HEAD(&net->xfrm.state_all); |
2096 | ||
f034b5d4 DM |
2097 | sz = sizeof(struct hlist_head) * 8; |
2098 | ||
73d189dc AD |
2099 | net->xfrm.state_bydst = xfrm_hash_alloc(sz); |
2100 | if (!net->xfrm.state_bydst) | |
2101 | goto out_bydst; | |
d320bbb3 AD |
2102 | net->xfrm.state_bysrc = xfrm_hash_alloc(sz); |
2103 | if (!net->xfrm.state_bysrc) | |
2104 | goto out_bysrc; | |
b754a4fd AD |
2105 | net->xfrm.state_byspi = xfrm_hash_alloc(sz); |
2106 | if (!net->xfrm.state_byspi) | |
2107 | goto out_byspi; | |
529983ec | 2108 | net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); |
1da177e4 | 2109 | |
0bf7c5b0 | 2110 | net->xfrm.state_num = 0; |
63082733 | 2111 | INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); |
b8a0ae20 | 2112 | INIT_HLIST_HEAD(&net->xfrm.state_gc_list); |
c7837144 | 2113 | INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); |
50a30657 | 2114 | init_waitqueue_head(&net->xfrm.km_waitq); |
d62ddc21 | 2115 | return 0; |
73d189dc | 2116 | |
b754a4fd AD |
2117 | out_byspi: |
2118 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
d320bbb3 AD |
2119 | out_bysrc: |
2120 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
73d189dc AD |
2121 | out_bydst: |
2122 | return -ENOMEM; | |
d62ddc21 AD |
2123 | } |
2124 | ||
2125 | void xfrm_state_fini(struct net *net) | |
2126 | { | |
7c2776ee | 2127 | struct xfrm_audit audit_info; |
73d189dc AD |
2128 | unsigned int sz; |
2129 | ||
7c2776ee AD |
2130 | flush_work(&net->xfrm.state_hash_work); |
2131 | audit_info.loginuid = -1; | |
2132 | audit_info.sessionid = -1; | |
2133 | audit_info.secid = 0; | |
2134 | xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info); | |
2135 | flush_work(&net->xfrm.state_gc_work); | |
2136 | ||
9d4139c7 | 2137 | WARN_ON(!list_empty(&net->xfrm.state_all)); |
73d189dc | 2138 | |
529983ec | 2139 | sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); |
b754a4fd AD |
2140 | WARN_ON(!hlist_empty(net->xfrm.state_byspi)); |
2141 | xfrm_hash_free(net->xfrm.state_byspi, sz); | |
d320bbb3 AD |
2142 | WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); |
2143 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
73d189dc AD |
2144 | WARN_ON(!hlist_empty(net->xfrm.state_bydst)); |
2145 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
1da177e4 LT |
2146 | } |
2147 | ||
ab5f5e8b | 2148 | #ifdef CONFIG_AUDITSYSCALL |
cf35f43e IJ |
2149 | static void xfrm_audit_helper_sainfo(struct xfrm_state *x, |
2150 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2151 | { |
68277acc PM |
2152 | struct xfrm_sec_ctx *ctx = x->security; |
2153 | u32 spi = ntohl(x->id.spi); | |
2154 | ||
2155 | if (ctx) | |
ab5f5e8b | 2156 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
68277acc | 2157 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b JL |
2158 | |
2159 | switch(x->props.family) { | |
2160 | case AF_INET: | |
21454aaa HH |
2161 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2162 | &x->props.saddr.a4, &x->id.daddr.a4); | |
ab5f5e8b JL |
2163 | break; |
2164 | case AF_INET6: | |
5b095d98 | 2165 | audit_log_format(audit_buf, " src=%pI6 dst=%pI6", |
fdb46ee7 | 2166 | x->props.saddr.a6, x->id.daddr.a6); |
ab5f5e8b JL |
2167 | break; |
2168 | } | |
68277acc PM |
2169 | |
2170 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
ab5f5e8b JL |
2171 | } |
2172 | ||
cf35f43e IJ |
2173 | static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, |
2174 | struct audit_buffer *audit_buf) | |
afeb14b4 PM |
2175 | { |
2176 | struct iphdr *iph4; | |
2177 | struct ipv6hdr *iph6; | |
2178 | ||
2179 | switch (family) { | |
2180 | case AF_INET: | |
2181 | iph4 = ip_hdr(skb); | |
21454aaa HH |
2182 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2183 | &iph4->saddr, &iph4->daddr); | |
afeb14b4 PM |
2184 | break; |
2185 | case AF_INET6: | |
2186 | iph6 = ipv6_hdr(skb); | |
2187 | audit_log_format(audit_buf, | |
5b095d98 | 2188 | " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", |
fdb46ee7 | 2189 | &iph6->saddr,&iph6->daddr, |
afeb14b4 PM |
2190 | iph6->flow_lbl[0] & 0x0f, |
2191 | iph6->flow_lbl[1], | |
2192 | iph6->flow_lbl[2]); | |
2193 | break; | |
2194 | } | |
2195 | } | |
2196 | ||
68277acc | 2197 | void xfrm_audit_state_add(struct xfrm_state *x, int result, |
2532386f | 2198 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2199 | { |
2200 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2201 | |
afeb14b4 | 2202 | audit_buf = xfrm_audit_start("SAD-add"); |
ab5f5e8b JL |
2203 | if (audit_buf == NULL) |
2204 | return; | |
2532386f | 2205 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2206 | xfrm_audit_helper_sainfo(x, audit_buf); |
2207 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2208 | audit_log_end(audit_buf); |
2209 | } | |
2210 | EXPORT_SYMBOL_GPL(xfrm_audit_state_add); | |
2211 | ||
68277acc | 2212 | void xfrm_audit_state_delete(struct xfrm_state *x, int result, |
2532386f | 2213 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2214 | { |
2215 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2216 | |
afeb14b4 | 2217 | audit_buf = xfrm_audit_start("SAD-delete"); |
ab5f5e8b JL |
2218 | if (audit_buf == NULL) |
2219 | return; | |
2532386f | 2220 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2221 | xfrm_audit_helper_sainfo(x, audit_buf); |
2222 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2223 | audit_log_end(audit_buf); |
2224 | } | |
2225 | EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); | |
afeb14b4 PM |
2226 | |
2227 | void xfrm_audit_state_replay_overflow(struct xfrm_state *x, | |
2228 | struct sk_buff *skb) | |
2229 | { | |
2230 | struct audit_buffer *audit_buf; | |
2231 | u32 spi; | |
2232 | ||
2233 | audit_buf = xfrm_audit_start("SA-replay-overflow"); | |
2234 | if (audit_buf == NULL) | |
2235 | return; | |
2236 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2237 | /* don't record the sequence number because it's inherent in this kind | |
2238 | * of audit message */ | |
2239 | spi = ntohl(x->id.spi); | |
2240 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
2241 | audit_log_end(audit_buf); | |
2242 | } | |
2243 | EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); | |
2244 | ||
2245 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
2246 | struct sk_buff *skb, __be32 net_seq) | |
2247 | { | |
2248 | struct audit_buffer *audit_buf; | |
2249 | u32 spi; | |
2250 | ||
2251 | audit_buf = xfrm_audit_start("SA-replayed-pkt"); | |
2252 | if (audit_buf == NULL) | |
2253 | return; | |
2254 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2255 | spi = ntohl(x->id.spi); | |
2256 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2257 | spi, spi, ntohl(net_seq)); | |
2258 | audit_log_end(audit_buf); | |
2259 | } | |
2260 | ||
2261 | void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) | |
2262 | { | |
2263 | struct audit_buffer *audit_buf; | |
2264 | ||
2265 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2266 | if (audit_buf == NULL) | |
2267 | return; | |
2268 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2269 | audit_log_end(audit_buf); | |
2270 | } | |
2271 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); | |
2272 | ||
2273 | void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, | |
2274 | __be32 net_spi, __be32 net_seq) | |
2275 | { | |
2276 | struct audit_buffer *audit_buf; | |
2277 | u32 spi; | |
2278 | ||
2279 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2280 | if (audit_buf == NULL) | |
2281 | return; | |
2282 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2283 | spi = ntohl(net_spi); | |
2284 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2285 | spi, spi, ntohl(net_seq)); | |
2286 | audit_log_end(audit_buf); | |
2287 | } | |
2288 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); | |
2289 | ||
2290 | void xfrm_audit_state_icvfail(struct xfrm_state *x, | |
2291 | struct sk_buff *skb, u8 proto) | |
2292 | { | |
2293 | struct audit_buffer *audit_buf; | |
2294 | __be32 net_spi; | |
2295 | __be32 net_seq; | |
2296 | ||
2297 | audit_buf = xfrm_audit_start("SA-icv-failure"); | |
2298 | if (audit_buf == NULL) | |
2299 | return; | |
2300 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2301 | if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { | |
2302 | u32 spi = ntohl(net_spi); | |
2303 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2304 | spi, spi, ntohl(net_seq)); | |
2305 | } | |
2306 | audit_log_end(audit_buf); | |
2307 | } | |
2308 | EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); | |
ab5f5e8b | 2309 | #endif /* CONFIG_AUDITSYSCALL */ |