Commit | Line | Data |
---|---|---|
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 | ||
64d0cd00 | 45 | static inline unsigned int xfrm_dst_hash(struct net *net, |
2ab38503 DM |
46 | const xfrm_address_t *daddr, |
47 | const xfrm_address_t *saddr, | |
c1969f29 | 48 | u32 reqid, |
a624c108 | 49 | unsigned short family) |
f034b5d4 | 50 | { |
64d0cd00 | 51 | return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); |
f034b5d4 DM |
52 | } |
53 | ||
64d0cd00 | 54 | static inline unsigned int xfrm_src_hash(struct net *net, |
2ab38503 DM |
55 | const xfrm_address_t *daddr, |
56 | const xfrm_address_t *saddr, | |
44e36b42 | 57 | unsigned short family) |
f034b5d4 | 58 | { |
64d0cd00 | 59 | return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); |
f034b5d4 DM |
60 | } |
61 | ||
f034b5d4 | 62 | static inline unsigned int |
2ab38503 DM |
63 | xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr, |
64 | __be32 spi, u8 proto, unsigned short family) | |
f034b5d4 | 65 | { |
64d0cd00 | 66 | return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); |
f034b5d4 DM |
67 | } |
68 | ||
f034b5d4 DM |
69 | static void xfrm_hash_transfer(struct hlist_head *list, |
70 | struct hlist_head *ndsttable, | |
71 | struct hlist_head *nsrctable, | |
72 | struct hlist_head *nspitable, | |
73 | unsigned int nhashmask) | |
74 | { | |
75 | struct hlist_node *entry, *tmp; | |
76 | struct xfrm_state *x; | |
77 | ||
78 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
79 | unsigned int h; | |
80 | ||
c1969f29 DM |
81 | h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
82 | x->props.reqid, x->props.family, | |
83 | nhashmask); | |
f034b5d4 DM |
84 | hlist_add_head(&x->bydst, ndsttable+h); |
85 | ||
667bbcb6 MN |
86 | h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, |
87 | x->props.family, | |
f034b5d4 DM |
88 | nhashmask); |
89 | hlist_add_head(&x->bysrc, nsrctable+h); | |
90 | ||
7b4dc360 MN |
91 | if (x->id.spi) { |
92 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, | |
93 | x->id.proto, x->props.family, | |
94 | nhashmask); | |
95 | hlist_add_head(&x->byspi, nspitable+h); | |
96 | } | |
f034b5d4 DM |
97 | } |
98 | } | |
99 | ||
63082733 | 100 | static unsigned long xfrm_hash_new_size(unsigned int state_hmask) |
f034b5d4 | 101 | { |
63082733 | 102 | return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); |
f034b5d4 DM |
103 | } |
104 | ||
105 | static DEFINE_MUTEX(hash_resize_mutex); | |
106 | ||
63082733 | 107 | static void xfrm_hash_resize(struct work_struct *work) |
f034b5d4 | 108 | { |
63082733 | 109 | struct net *net = container_of(work, struct net, xfrm.state_hash_work); |
f034b5d4 DM |
110 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; |
111 | unsigned long nsize, osize; | |
112 | unsigned int nhashmask, ohashmask; | |
113 | int i; | |
114 | ||
115 | mutex_lock(&hash_resize_mutex); | |
116 | ||
63082733 | 117 | nsize = xfrm_hash_new_size(net->xfrm.state_hmask); |
44e36b42 | 118 | ndst = xfrm_hash_alloc(nsize); |
f034b5d4 DM |
119 | if (!ndst) |
120 | goto out_unlock; | |
44e36b42 | 121 | nsrc = xfrm_hash_alloc(nsize); |
f034b5d4 | 122 | if (!nsrc) { |
44e36b42 | 123 | xfrm_hash_free(ndst, nsize); |
f034b5d4 DM |
124 | goto out_unlock; |
125 | } | |
44e36b42 | 126 | nspi = xfrm_hash_alloc(nsize); |
f034b5d4 | 127 | if (!nspi) { |
44e36b42 DM |
128 | xfrm_hash_free(ndst, nsize); |
129 | xfrm_hash_free(nsrc, nsize); | |
f034b5d4 DM |
130 | goto out_unlock; |
131 | } | |
132 | ||
133 | spin_lock_bh(&xfrm_state_lock); | |
134 | ||
135 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
63082733 AD |
136 | for (i = net->xfrm.state_hmask; i >= 0; i--) |
137 | xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi, | |
f034b5d4 DM |
138 | nhashmask); |
139 | ||
63082733 AD |
140 | odst = net->xfrm.state_bydst; |
141 | osrc = net->xfrm.state_bysrc; | |
142 | ospi = net->xfrm.state_byspi; | |
143 | ohashmask = net->xfrm.state_hmask; | |
f034b5d4 | 144 | |
63082733 AD |
145 | net->xfrm.state_bydst = ndst; |
146 | net->xfrm.state_bysrc = nsrc; | |
147 | net->xfrm.state_byspi = nspi; | |
148 | net->xfrm.state_hmask = nhashmask; | |
f034b5d4 DM |
149 | |
150 | spin_unlock_bh(&xfrm_state_lock); | |
151 | ||
152 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 DM |
153 | xfrm_hash_free(odst, osize); |
154 | xfrm_hash_free(osrc, osize); | |
155 | xfrm_hash_free(ospi, osize); | |
f034b5d4 DM |
156 | |
157 | out_unlock: | |
158 | mutex_unlock(&hash_resize_mutex); | |
159 | } | |
160 | ||
44abdc30 CW |
161 | static DEFINE_SPINLOCK(xfrm_state_afinfo_lock); |
162 | static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO]; | |
1da177e4 | 163 | |
1da177e4 LT |
164 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
165 | ||
53bc6b4d | 166 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 | 167 | |
980ebd25 | 168 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
15e47304 | 169 | void km_state_expired(struct xfrm_state *x, int hard, u32 portid); |
1da177e4 | 170 | |
7a9885b9 | 171 | static DEFINE_SPINLOCK(xfrm_type_lock); |
533cb5b0 | 172 | int xfrm_register_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc | 173 | { |
7a9885b9 | 174 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); |
533cb5b0 | 175 | const struct xfrm_type **typemap; |
aa5d62cc HX |
176 | int err = 0; |
177 | ||
178 | if (unlikely(afinfo == NULL)) | |
179 | return -EAFNOSUPPORT; | |
180 | typemap = afinfo->type_map; | |
7a9885b9 | 181 | spin_lock_bh(&xfrm_type_lock); |
aa5d62cc HX |
182 | |
183 | if (likely(typemap[type->proto] == NULL)) | |
184 | typemap[type->proto] = type; | |
185 | else | |
186 | err = -EEXIST; | |
7a9885b9 CW |
187 | spin_unlock_bh(&xfrm_type_lock); |
188 | xfrm_state_put_afinfo(afinfo); | |
aa5d62cc HX |
189 | return err; |
190 | } | |
191 | EXPORT_SYMBOL(xfrm_register_type); | |
192 | ||
533cb5b0 | 193 | int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc | 194 | { |
7a9885b9 | 195 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); |
533cb5b0 | 196 | const struct xfrm_type **typemap; |
aa5d62cc HX |
197 | int err = 0; |
198 | ||
199 | if (unlikely(afinfo == NULL)) | |
200 | return -EAFNOSUPPORT; | |
201 | typemap = afinfo->type_map; | |
7a9885b9 | 202 | spin_lock_bh(&xfrm_type_lock); |
aa5d62cc HX |
203 | |
204 | if (unlikely(typemap[type->proto] != type)) | |
205 | err = -ENOENT; | |
206 | else | |
207 | typemap[type->proto] = NULL; | |
7a9885b9 CW |
208 | spin_unlock_bh(&xfrm_type_lock); |
209 | xfrm_state_put_afinfo(afinfo); | |
aa5d62cc HX |
210 | return err; |
211 | } | |
212 | EXPORT_SYMBOL(xfrm_unregister_type); | |
213 | ||
533cb5b0 | 214 | static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) |
aa5d62cc HX |
215 | { |
216 | struct xfrm_state_afinfo *afinfo; | |
533cb5b0 ED |
217 | const struct xfrm_type **typemap; |
218 | const struct xfrm_type *type; | |
aa5d62cc HX |
219 | int modload_attempted = 0; |
220 | ||
221 | retry: | |
222 | afinfo = xfrm_state_get_afinfo(family); | |
223 | if (unlikely(afinfo == NULL)) | |
224 | return NULL; | |
225 | typemap = afinfo->type_map; | |
226 | ||
227 | type = typemap[proto]; | |
228 | if (unlikely(type && !try_module_get(type->owner))) | |
229 | type = NULL; | |
230 | if (!type && !modload_attempted) { | |
231 | xfrm_state_put_afinfo(afinfo); | |
232 | request_module("xfrm-type-%d-%d", family, proto); | |
233 | modload_attempted = 1; | |
234 | goto retry; | |
235 | } | |
236 | ||
237 | xfrm_state_put_afinfo(afinfo); | |
238 | return type; | |
239 | } | |
240 | ||
533cb5b0 | 241 | static void xfrm_put_type(const struct xfrm_type *type) |
aa5d62cc HX |
242 | { |
243 | module_put(type->owner); | |
244 | } | |
245 | ||
7a9885b9 | 246 | static DEFINE_SPINLOCK(xfrm_mode_lock); |
aa5d62cc HX |
247 | int xfrm_register_mode(struct xfrm_mode *mode, int family) |
248 | { | |
249 | struct xfrm_state_afinfo *afinfo; | |
250 | struct xfrm_mode **modemap; | |
251 | int err; | |
252 | ||
253 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
254 | return -EINVAL; | |
255 | ||
7a9885b9 | 256 | afinfo = xfrm_state_get_afinfo(family); |
aa5d62cc HX |
257 | if (unlikely(afinfo == NULL)) |
258 | return -EAFNOSUPPORT; | |
259 | ||
260 | err = -EEXIST; | |
261 | modemap = afinfo->mode_map; | |
7a9885b9 | 262 | spin_lock_bh(&xfrm_mode_lock); |
17c2a42a HX |
263 | if (modemap[mode->encap]) |
264 | goto out; | |
aa5d62cc | 265 | |
17c2a42a HX |
266 | err = -ENOENT; |
267 | if (!try_module_get(afinfo->owner)) | |
268 | goto out; | |
269 | ||
270 | mode->afinfo = afinfo; | |
271 | modemap[mode->encap] = mode; | |
272 | err = 0; | |
273 | ||
274 | out: | |
7a9885b9 CW |
275 | spin_unlock_bh(&xfrm_mode_lock); |
276 | xfrm_state_put_afinfo(afinfo); | |
aa5d62cc HX |
277 | return err; |
278 | } | |
279 | EXPORT_SYMBOL(xfrm_register_mode); | |
280 | ||
281 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
282 | { | |
283 | struct xfrm_state_afinfo *afinfo; | |
284 | struct xfrm_mode **modemap; | |
285 | int err; | |
286 | ||
287 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
288 | return -EINVAL; | |
289 | ||
7a9885b9 | 290 | afinfo = xfrm_state_get_afinfo(family); |
aa5d62cc HX |
291 | if (unlikely(afinfo == NULL)) |
292 | return -EAFNOSUPPORT; | |
293 | ||
294 | err = -ENOENT; | |
295 | modemap = afinfo->mode_map; | |
7a9885b9 | 296 | spin_lock_bh(&xfrm_mode_lock); |
aa5d62cc HX |
297 | if (likely(modemap[mode->encap] == mode)) { |
298 | modemap[mode->encap] = NULL; | |
17c2a42a | 299 | module_put(mode->afinfo->owner); |
aa5d62cc HX |
300 | err = 0; |
301 | } | |
302 | ||
7a9885b9 CW |
303 | spin_unlock_bh(&xfrm_mode_lock); |
304 | xfrm_state_put_afinfo(afinfo); | |
aa5d62cc HX |
305 | return err; |
306 | } | |
307 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
308 | ||
309 | static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
310 | { | |
311 | struct xfrm_state_afinfo *afinfo; | |
312 | struct xfrm_mode *mode; | |
313 | int modload_attempted = 0; | |
314 | ||
315 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
316 | return NULL; | |
317 | ||
318 | retry: | |
319 | afinfo = xfrm_state_get_afinfo(family); | |
320 | if (unlikely(afinfo == NULL)) | |
321 | return NULL; | |
322 | ||
323 | mode = afinfo->mode_map[encap]; | |
324 | if (unlikely(mode && !try_module_get(mode->owner))) | |
325 | mode = NULL; | |
326 | if (!mode && !modload_attempted) { | |
327 | xfrm_state_put_afinfo(afinfo); | |
328 | request_module("xfrm-mode-%d-%d", family, encap); | |
329 | modload_attempted = 1; | |
330 | goto retry; | |
331 | } | |
332 | ||
333 | xfrm_state_put_afinfo(afinfo); | |
334 | return mode; | |
335 | } | |
336 | ||
337 | static void xfrm_put_mode(struct xfrm_mode *mode) | |
338 | { | |
339 | module_put(mode->owner); | |
340 | } | |
341 | ||
1da177e4 LT |
342 | static void xfrm_state_gc_destroy(struct xfrm_state *x) |
343 | { | |
9e0d57fd | 344 | tasklet_hrtimer_cancel(&x->mtimer); |
a47f0ce0 | 345 | del_timer_sync(&x->rtimer); |
a51482bd JJ |
346 | kfree(x->aalg); |
347 | kfree(x->ealg); | |
348 | kfree(x->calg); | |
349 | kfree(x->encap); | |
060f02a3 | 350 | kfree(x->coaddr); |
d8647b79 SK |
351 | kfree(x->replay_esn); |
352 | kfree(x->preplay_esn); | |
13996378 HX |
353 | if (x->inner_mode) |
354 | xfrm_put_mode(x->inner_mode); | |
df9dcb45 KM |
355 | if (x->inner_mode_iaf) |
356 | xfrm_put_mode(x->inner_mode_iaf); | |
13996378 HX |
357 | if (x->outer_mode) |
358 | xfrm_put_mode(x->outer_mode); | |
1da177e4 LT |
359 | if (x->type) { |
360 | x->type->destructor(x); | |
361 | xfrm_put_type(x->type); | |
362 | } | |
df71837d | 363 | security_xfrm_state_free(x); |
1da177e4 LT |
364 | kfree(x); |
365 | } | |
366 | ||
c7837144 | 367 | static void xfrm_state_gc_task(struct work_struct *work) |
1da177e4 | 368 | { |
c7837144 | 369 | struct net *net = container_of(work, struct net, xfrm.state_gc_work); |
12a169e7 HX |
370 | struct xfrm_state *x; |
371 | struct hlist_node *entry, *tmp; | |
372 | struct hlist_head gc_list; | |
1da177e4 | 373 | |
1da177e4 | 374 | spin_lock_bh(&xfrm_state_gc_lock); |
c7837144 | 375 | hlist_move_list(&net->xfrm.state_gc_list, &gc_list); |
1da177e4 LT |
376 | spin_unlock_bh(&xfrm_state_gc_lock); |
377 | ||
12a169e7 | 378 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist) |
1da177e4 | 379 | xfrm_state_gc_destroy(x); |
8f126e37 | 380 | |
50a30657 | 381 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
382 | } |
383 | ||
384 | static inline unsigned long make_jiffies(long secs) | |
385 | { | |
386 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
387 | return MAX_SCHEDULE_TIMEOUT-1; | |
388 | else | |
a716c119 | 389 | return secs*HZ; |
1da177e4 LT |
390 | } |
391 | ||
9e0d57fd | 392 | static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me) |
1da177e4 | 393 | { |
9e0d57fd YP |
394 | struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer); |
395 | struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer); | |
98806f75 | 396 | struct net *net = xs_net(x); |
9d729f72 | 397 | unsigned long now = get_seconds(); |
1da177e4 LT |
398 | long next = LONG_MAX; |
399 | int warn = 0; | |
161a09e7 | 400 | int err = 0; |
1da177e4 LT |
401 | |
402 | spin_lock(&x->lock); | |
403 | if (x->km.state == XFRM_STATE_DEAD) | |
404 | goto out; | |
405 | if (x->km.state == XFRM_STATE_EXPIRED) | |
406 | goto expired; | |
407 | if (x->lft.hard_add_expires_seconds) { | |
408 | long tmo = x->lft.hard_add_expires_seconds + | |
409 | x->curlft.add_time - now; | |
e3c0d047 FD |
410 | if (tmo <= 0) { |
411 | if (x->xflags & XFRM_SOFT_EXPIRE) { | |
412 | /* enter hard expire without soft expire first?! | |
413 | * setting a new date could trigger this. | |
414 | * workarbound: fix x->curflt.add_time by below: | |
415 | */ | |
416 | x->curlft.add_time = now - x->saved_tmo - 1; | |
417 | tmo = x->lft.hard_add_expires_seconds - x->saved_tmo; | |
418 | } else | |
419 | goto expired; | |
420 | } | |
1da177e4 LT |
421 | if (tmo < next) |
422 | next = tmo; | |
423 | } | |
424 | if (x->lft.hard_use_expires_seconds) { | |
425 | long tmo = x->lft.hard_use_expires_seconds + | |
426 | (x->curlft.use_time ? : now) - now; | |
427 | if (tmo <= 0) | |
428 | goto expired; | |
429 | if (tmo < next) | |
430 | next = tmo; | |
431 | } | |
432 | if (x->km.dying) | |
433 | goto resched; | |
434 | if (x->lft.soft_add_expires_seconds) { | |
435 | long tmo = x->lft.soft_add_expires_seconds + | |
436 | x->curlft.add_time - now; | |
e3c0d047 | 437 | if (tmo <= 0) { |
1da177e4 | 438 | warn = 1; |
e3c0d047 FD |
439 | x->xflags &= ~XFRM_SOFT_EXPIRE; |
440 | } else if (tmo < next) { | |
1da177e4 | 441 | next = tmo; |
e3c0d047 FD |
442 | x->xflags |= XFRM_SOFT_EXPIRE; |
443 | x->saved_tmo = tmo; | |
444 | } | |
1da177e4 LT |
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, |
33765d06 | 662 | const xfrm_address_t *daddr, const xfrm_address_t *saddr, |
8444cf71 | 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 * |
33765d06 | 793 | xfrm_state_find(const xfrm_address_t *daddr, const 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 | |
1d28f42c | 862 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); |
e0d1caa7 VY |
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 */ |
a70486f0 DM |
1000 | static struct xfrm_state *__find_acq_core(struct net *net, struct xfrm_mark *m, |
1001 | unsigned short family, u8 mode, | |
1002 | u32 reqid, u8 proto, | |
1003 | const xfrm_address_t *daddr, | |
1004 | const xfrm_address_t *saddr, int create) | |
2770834c | 1005 | { |
5447c5e4 | 1006 | unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
8f126e37 | 1007 | struct hlist_node *entry; |
2770834c | 1008 | struct xfrm_state *x; |
3d6acfa7 | 1009 | u32 mark = m->v & m->m; |
2770834c | 1010 | |
5447c5e4 | 1011 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { |
2770834c DM |
1012 | if (x->props.reqid != reqid || |
1013 | x->props.mode != mode || | |
1014 | x->props.family != family || | |
1015 | x->km.state != XFRM_STATE_ACQ || | |
75e252d9 | 1016 | x->id.spi != 0 || |
1802571b | 1017 | x->id.proto != proto || |
3d6acfa7 | 1018 | (mark & x->mark.m) != x->mark.v || |
1802571b WY |
1019 | xfrm_addr_cmp(&x->id.daddr, daddr, family) || |
1020 | xfrm_addr_cmp(&x->props.saddr, saddr, family)) | |
2770834c DM |
1021 | continue; |
1022 | ||
2770834c DM |
1023 | xfrm_state_hold(x); |
1024 | return x; | |
1025 | } | |
1026 | ||
1027 | if (!create) | |
1028 | return NULL; | |
1029 | ||
5447c5e4 | 1030 | x = xfrm_state_alloc(net); |
2770834c DM |
1031 | if (likely(x)) { |
1032 | switch (family) { | |
1033 | case AF_INET: | |
1034 | x->sel.daddr.a4 = daddr->a4; | |
1035 | x->sel.saddr.a4 = saddr->a4; | |
1036 | x->sel.prefixlen_d = 32; | |
1037 | x->sel.prefixlen_s = 32; | |
1038 | x->props.saddr.a4 = saddr->a4; | |
1039 | x->id.daddr.a4 = daddr->a4; | |
1040 | break; | |
1041 | ||
1042 | case AF_INET6: | |
4e3fd7a0 AD |
1043 | *(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr; |
1044 | *(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr; | |
2770834c DM |
1045 | x->sel.prefixlen_d = 128; |
1046 | x->sel.prefixlen_s = 128; | |
4e3fd7a0 AD |
1047 | *(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr; |
1048 | *(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr; | |
2770834c | 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 | ||
af2f464e SK |
1185 | if (orig->replay_esn) { |
1186 | err = xfrm_replay_clone(x, orig); | |
1187 | if (err) | |
1188 | goto error; | |
1189 | } | |
1190 | ||
bd55775c JHS |
1191 | memcpy(&x->mark, &orig->mark, sizeof(x->mark)); |
1192 | ||
80c9abaa SS |
1193 | err = xfrm_init_state(x); |
1194 | if (err) | |
1195 | goto error; | |
1196 | ||
1197 | x->props.flags = orig->props.flags; | |
1198 | ||
1199 | x->curlft.add_time = orig->curlft.add_time; | |
1200 | x->km.state = orig->km.state; | |
1201 | x->km.seq = orig->km.seq; | |
1202 | ||
1203 | return x; | |
1204 | ||
1205 | error: | |
553f9118 HX |
1206 | xfrm_state_put(x); |
1207 | out: | |
80c9abaa SS |
1208 | if (errp) |
1209 | *errp = err; | |
80c9abaa SS |
1210 | return NULL; |
1211 | } | |
80c9abaa SS |
1212 | |
1213 | /* xfrm_state_lock is held */ | |
1214 | struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) | |
1215 | { | |
1216 | unsigned int h; | |
1217 | struct xfrm_state *x; | |
1218 | struct hlist_node *entry; | |
1219 | ||
1220 | if (m->reqid) { | |
64d0cd00 | 1221 | h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1222 | m->reqid, m->old_family); |
73d189dc | 1223 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { |
80c9abaa SS |
1224 | if (x->props.mode != m->mode || |
1225 | x->id.proto != m->proto) | |
1226 | continue; | |
1227 | if (m->reqid && x->props.reqid != m->reqid) | |
1228 | continue; | |
1229 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1230 | m->old_family) || | |
1231 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1232 | m->old_family)) | |
1233 | continue; | |
1234 | xfrm_state_hold(x); | |
1235 | return x; | |
1236 | } | |
1237 | } else { | |
64d0cd00 | 1238 | h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1239 | m->old_family); |
d320bbb3 | 1240 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) { |
80c9abaa SS |
1241 | if (x->props.mode != m->mode || |
1242 | x->id.proto != m->proto) | |
1243 | continue; | |
1244 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1245 | m->old_family) || | |
1246 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1247 | m->old_family)) | |
1248 | continue; | |
1249 | xfrm_state_hold(x); | |
1250 | return x; | |
1251 | } | |
1252 | } | |
1253 | ||
a716c119 | 1254 | return NULL; |
80c9abaa SS |
1255 | } |
1256 | EXPORT_SYMBOL(xfrm_migrate_state_find); | |
1257 | ||
1258 | struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, | |
1259 | struct xfrm_migrate *m) | |
1260 | { | |
1261 | struct xfrm_state *xc; | |
1262 | int err; | |
1263 | ||
1264 | xc = xfrm_state_clone(x, &err); | |
1265 | if (!xc) | |
1266 | return NULL; | |
1267 | ||
1268 | memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); | |
1269 | memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); | |
1270 | ||
1271 | /* add state */ | |
1272 | if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) { | |
1273 | /* a care is needed when the destination address of the | |
1274 | state is to be updated as it is a part of triplet */ | |
1275 | xfrm_state_insert(xc); | |
1276 | } else { | |
1277 | if ((err = xfrm_state_add(xc)) < 0) | |
1278 | goto error; | |
1279 | } | |
1280 | ||
1281 | return xc; | |
1282 | error: | |
78347c8c | 1283 | xfrm_state_put(xc); |
80c9abaa SS |
1284 | return NULL; |
1285 | } | |
1286 | EXPORT_SYMBOL(xfrm_state_migrate); | |
1287 | #endif | |
1288 | ||
1da177e4 LT |
1289 | int xfrm_state_update(struct xfrm_state *x) |
1290 | { | |
37b08e34 | 1291 | struct xfrm_state *x1, *to_put; |
1da177e4 | 1292 | int err; |
eb2971b6 | 1293 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 1294 | |
37b08e34 DM |
1295 | to_put = NULL; |
1296 | ||
1da177e4 | 1297 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 1298 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
1299 | |
1300 | err = -ESRCH; | |
1301 | if (!x1) | |
1302 | goto out; | |
1303 | ||
1304 | if (xfrm_state_kern(x1)) { | |
37b08e34 | 1305 | to_put = x1; |
1da177e4 LT |
1306 | err = -EEXIST; |
1307 | goto out; | |
1308 | } | |
1309 | ||
1310 | if (x1->km.state == XFRM_STATE_ACQ) { | |
1311 | __xfrm_state_insert(x); | |
1312 | x = NULL; | |
1313 | } | |
1314 | err = 0; | |
1315 | ||
1316 | out: | |
1317 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 | 1318 | |
37b08e34 DM |
1319 | if (to_put) |
1320 | xfrm_state_put(to_put); | |
1321 | ||
1da177e4 LT |
1322 | if (err) |
1323 | return err; | |
1324 | ||
1325 | if (!x) { | |
1326 | xfrm_state_delete(x1); | |
1327 | xfrm_state_put(x1); | |
1328 | return 0; | |
1329 | } | |
1330 | ||
1331 | err = -EINVAL; | |
1332 | spin_lock_bh(&x1->lock); | |
1333 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
1334 | if (x->encap && x1->encap) | |
1335 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
1336 | if (x->coaddr && x1->coaddr) { |
1337 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
1338 | } | |
1339 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
1340 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
1341 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
1342 | x1->km.dying = 0; | |
1343 | ||
9e0d57fd | 1344 | tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); |
1da177e4 LT |
1345 | if (x1->curlft.use_time) |
1346 | xfrm_state_check_expire(x1); | |
1347 | ||
1348 | err = 0; | |
8fcbc637 TG |
1349 | x->km.state = XFRM_STATE_DEAD; |
1350 | __xfrm_state_put(x); | |
1da177e4 LT |
1351 | } |
1352 | spin_unlock_bh(&x1->lock); | |
1353 | ||
1354 | xfrm_state_put(x1); | |
1355 | ||
1356 | return err; | |
1357 | } | |
1358 | EXPORT_SYMBOL(xfrm_state_update); | |
1359 | ||
1360 | int xfrm_state_check_expire(struct xfrm_state *x) | |
1361 | { | |
1362 | if (!x->curlft.use_time) | |
9d729f72 | 1363 | x->curlft.use_time = get_seconds(); |
1da177e4 | 1364 | |
1da177e4 LT |
1365 | if (x->curlft.bytes >= x->lft.hard_byte_limit || |
1366 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 1367 | x->km.state = XFRM_STATE_EXPIRED; |
9e0d57fd | 1368 | tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL); |
1da177e4 LT |
1369 | return -EINVAL; |
1370 | } | |
1371 | ||
1372 | if (!x->km.dying && | |
1373 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
1374 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
1375 | x->km.dying = 1; | |
53bc6b4d | 1376 | km_state_expired(x, 0, 0); |
4666faab | 1377 | } |
1da177e4 LT |
1378 | return 0; |
1379 | } | |
1380 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
1381 | ||
1da177e4 | 1382 | struct xfrm_state * |
a70486f0 | 1383 | xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, |
bd55775c | 1384 | u8 proto, unsigned short family) |
1da177e4 LT |
1385 | { |
1386 | struct xfrm_state *x; | |
1da177e4 LT |
1387 | |
1388 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1389 | x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); |
1da177e4 | 1390 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
1391 | return x; |
1392 | } | |
1393 | EXPORT_SYMBOL(xfrm_state_lookup); | |
1394 | ||
1395 | struct xfrm_state * | |
bd55775c | 1396 | xfrm_state_lookup_byaddr(struct net *net, u32 mark, |
a70486f0 | 1397 | const xfrm_address_t *daddr, const xfrm_address_t *saddr, |
eb2971b6 MN |
1398 | u8 proto, unsigned short family) |
1399 | { | |
1400 | struct xfrm_state *x; | |
eb2971b6 MN |
1401 | |
1402 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1403 | x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); |
eb2971b6 | 1404 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
1405 | return x; |
1406 | } | |
1407 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
1408 | ||
1409 | struct xfrm_state * | |
bd55775c | 1410 | xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto, |
a70486f0 | 1411 | const xfrm_address_t *daddr, const xfrm_address_t *saddr, |
1da177e4 LT |
1412 | int create, unsigned short family) |
1413 | { | |
1414 | struct xfrm_state *x; | |
1da177e4 LT |
1415 | |
1416 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1417 | x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 1418 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 1419 | |
1da177e4 LT |
1420 | return x; |
1421 | } | |
1422 | EXPORT_SYMBOL(xfrm_find_acq); | |
1423 | ||
41a49cc3 MN |
1424 | #ifdef CONFIG_XFRM_SUB_POLICY |
1425 | int | |
1426 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
1427 | unsigned short family) | |
1428 | { | |
1429 | int err = 0; | |
1430 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1431 | if (!afinfo) | |
1432 | return -EAFNOSUPPORT; | |
1433 | ||
1434 | spin_lock_bh(&xfrm_state_lock); | |
1435 | if (afinfo->tmpl_sort) | |
1436 | err = afinfo->tmpl_sort(dst, src, n); | |
1437 | spin_unlock_bh(&xfrm_state_lock); | |
1438 | xfrm_state_put_afinfo(afinfo); | |
1439 | return err; | |
1440 | } | |
1441 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
1442 | ||
1443 | int | |
1444 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
1445 | unsigned short family) | |
1446 | { | |
1447 | int err = 0; | |
1448 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1449 | if (!afinfo) | |
1450 | return -EAFNOSUPPORT; | |
1451 | ||
1452 | spin_lock_bh(&xfrm_state_lock); | |
1453 | if (afinfo->state_sort) | |
1454 | err = afinfo->state_sort(dst, src, n); | |
1455 | spin_unlock_bh(&xfrm_state_lock); | |
1456 | xfrm_state_put_afinfo(afinfo); | |
1457 | return err; | |
1458 | } | |
1459 | EXPORT_SYMBOL(xfrm_state_sort); | |
1460 | #endif | |
1461 | ||
1da177e4 LT |
1462 | /* Silly enough, but I'm lazy to build resolution list */ |
1463 | ||
bd55775c | 1464 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) |
1da177e4 LT |
1465 | { |
1466 | int i; | |
1da177e4 | 1467 | |
5447c5e4 | 1468 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
1469 | struct hlist_node *entry; |
1470 | struct xfrm_state *x; | |
1471 | ||
5447c5e4 | 1472 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
8f126e37 | 1473 | if (x->km.seq == seq && |
3d6acfa7 | 1474 | (mark & x->mark.m) == x->mark.v && |
8f126e37 | 1475 | x->km.state == XFRM_STATE_ACQ) { |
1da177e4 LT |
1476 | xfrm_state_hold(x); |
1477 | return x; | |
1478 | } | |
1479 | } | |
1480 | } | |
1481 | return NULL; | |
1482 | } | |
1483 | ||
bd55775c | 1484 | struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) |
1da177e4 LT |
1485 | { |
1486 | struct xfrm_state *x; | |
1487 | ||
1488 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1489 | x = __xfrm_find_acq_byseq(net, mark, seq); |
1da177e4 LT |
1490 | spin_unlock_bh(&xfrm_state_lock); |
1491 | return x; | |
1492 | } | |
1493 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1494 | ||
1495 | u32 xfrm_get_acqseq(void) | |
1496 | { | |
1497 | u32 res; | |
6836b9bd | 1498 | static atomic_t acqseq; |
1499 | ||
1500 | do { | |
1501 | res = atomic_inc_return(&acqseq); | |
1502 | } while (!res); | |
1da177e4 | 1503 | |
1da177e4 LT |
1504 | return res; |
1505 | } | |
1506 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1507 | ||
658b219e | 1508 | int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) |
1da177e4 | 1509 | { |
221df1ed | 1510 | struct net *net = xs_net(x); |
f034b5d4 | 1511 | unsigned int h; |
1da177e4 | 1512 | struct xfrm_state *x0; |
658b219e HX |
1513 | int err = -ENOENT; |
1514 | __be32 minspi = htonl(low); | |
1515 | __be32 maxspi = htonl(high); | |
bd55775c | 1516 | u32 mark = x->mark.v & x->mark.m; |
1da177e4 | 1517 | |
658b219e HX |
1518 | spin_lock_bh(&x->lock); |
1519 | if (x->km.state == XFRM_STATE_DEAD) | |
1520 | goto unlock; | |
1521 | ||
1522 | err = 0; | |
1da177e4 | 1523 | if (x->id.spi) |
658b219e HX |
1524 | goto unlock; |
1525 | ||
1526 | err = -ENOENT; | |
1da177e4 LT |
1527 | |
1528 | if (minspi == maxspi) { | |
bd55775c | 1529 | x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); |
1da177e4 LT |
1530 | if (x0) { |
1531 | xfrm_state_put(x0); | |
658b219e | 1532 | goto unlock; |
1da177e4 LT |
1533 | } |
1534 | x->id.spi = minspi; | |
1535 | } else { | |
1536 | u32 spi = 0; | |
26977b4e AV |
1537 | for (h=0; h<high-low+1; h++) { |
1538 | spi = low + net_random()%(high-low+1); | |
bd55775c | 1539 | x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
1da177e4 LT |
1540 | if (x0 == NULL) { |
1541 | x->id.spi = htonl(spi); | |
1542 | break; | |
1543 | } | |
1544 | xfrm_state_put(x0); | |
1545 | } | |
1546 | } | |
1547 | if (x->id.spi) { | |
1548 | spin_lock_bh(&xfrm_state_lock); | |
12604d8a AD |
1549 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); |
1550 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 1551 | spin_unlock_bh(&xfrm_state_lock); |
658b219e HX |
1552 | |
1553 | err = 0; | |
1da177e4 | 1554 | } |
658b219e HX |
1555 | |
1556 | unlock: | |
1557 | spin_unlock_bh(&x->lock); | |
1558 | ||
1559 | return err; | |
1da177e4 LT |
1560 | } |
1561 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1562 | ||
284fa7da | 1563 | int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, |
4c563f76 | 1564 | int (*func)(struct xfrm_state *, int, void*), |
1da177e4 LT |
1565 | void *data) |
1566 | { | |
12a169e7 HX |
1567 | struct xfrm_state *state; |
1568 | struct xfrm_state_walk *x; | |
1da177e4 LT |
1569 | int err = 0; |
1570 | ||
12a169e7 | 1571 | if (walk->seq != 0 && list_empty(&walk->all)) |
4c563f76 TT |
1572 | return 0; |
1573 | ||
1da177e4 | 1574 | spin_lock_bh(&xfrm_state_lock); |
12a169e7 | 1575 | if (list_empty(&walk->all)) |
284fa7da | 1576 | x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); |
12a169e7 HX |
1577 | else |
1578 | x = list_entry(&walk->all, struct xfrm_state_walk, all); | |
284fa7da | 1579 | list_for_each_entry_from(x, &net->xfrm.state_all, all) { |
12a169e7 | 1580 | if (x->state == XFRM_STATE_DEAD) |
4c563f76 | 1581 | continue; |
12a169e7 HX |
1582 | state = container_of(x, struct xfrm_state, km); |
1583 | if (!xfrm_id_proto_match(state->id.proto, walk->proto)) | |
4c563f76 | 1584 | continue; |
12a169e7 HX |
1585 | err = func(state, walk->seq, data); |
1586 | if (err) { | |
1587 | list_move_tail(&walk->all, &x->all); | |
1588 | goto out; | |
1da177e4 | 1589 | } |
12a169e7 | 1590 | walk->seq++; |
1da177e4 | 1591 | } |
12a169e7 | 1592 | if (walk->seq == 0) { |
1da177e4 LT |
1593 | err = -ENOENT; |
1594 | goto out; | |
1595 | } | |
12a169e7 | 1596 | list_del_init(&walk->all); |
1da177e4 LT |
1597 | out: |
1598 | spin_unlock_bh(&xfrm_state_lock); | |
1599 | return err; | |
1600 | } | |
1601 | EXPORT_SYMBOL(xfrm_state_walk); | |
1602 | ||
5c182458 HX |
1603 | void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) |
1604 | { | |
12a169e7 | 1605 | INIT_LIST_HEAD(&walk->all); |
5c182458 | 1606 | walk->proto = proto; |
12a169e7 HX |
1607 | walk->state = XFRM_STATE_DEAD; |
1608 | walk->seq = 0; | |
5c182458 HX |
1609 | } |
1610 | EXPORT_SYMBOL(xfrm_state_walk_init); | |
1611 | ||
abb81c4f HX |
1612 | void xfrm_state_walk_done(struct xfrm_state_walk *walk) |
1613 | { | |
12a169e7 | 1614 | if (list_empty(&walk->all)) |
5c182458 | 1615 | return; |
5c182458 | 1616 | |
12a169e7 HX |
1617 | spin_lock_bh(&xfrm_state_lock); |
1618 | list_del(&walk->all); | |
7d0b591c | 1619 | spin_unlock_bh(&xfrm_state_lock); |
abb81c4f HX |
1620 | } |
1621 | EXPORT_SYMBOL(xfrm_state_walk_done); | |
1622 | ||
f8cd5488 JHS |
1623 | static void xfrm_replay_timer_handler(unsigned long data) |
1624 | { | |
1625 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1626 | ||
1627 | spin_lock(&x->lock); | |
1628 | ||
2717096a | 1629 | if (x->km.state == XFRM_STATE_VALID) { |
a6483b79 | 1630 | if (xfrm_aevent_is_on(xs_net(x))) |
9fdc4883 | 1631 | x->repl->notify(x, XFRM_REPLAY_TIMEOUT); |
2717096a JHS |
1632 | else |
1633 | x->xflags |= XFRM_TIME_DEFER; | |
1634 | } | |
f8cd5488 JHS |
1635 | |
1636 | spin_unlock(&x->lock); | |
1637 | } | |
1638 | ||
df01812e | 1639 | static LIST_HEAD(xfrm_km_list); |
1da177e4 | 1640 | |
214e005b | 1641 | void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) |
1da177e4 LT |
1642 | { |
1643 | struct xfrm_mgr *km; | |
1644 | ||
85168c00 CW |
1645 | rcu_read_lock(); |
1646 | list_for_each_entry_rcu(km, &xfrm_km_list, list) | |
26b15dad JHS |
1647 | if (km->notify_policy) |
1648 | km->notify_policy(xp, dir, c); | |
85168c00 | 1649 | rcu_read_unlock(); |
26b15dad | 1650 | } |
1da177e4 | 1651 | |
214e005b | 1652 | void km_state_notify(struct xfrm_state *x, const struct km_event *c) |
26b15dad JHS |
1653 | { |
1654 | struct xfrm_mgr *km; | |
85168c00 CW |
1655 | rcu_read_lock(); |
1656 | list_for_each_entry_rcu(km, &xfrm_km_list, list) | |
26b15dad JHS |
1657 | if (km->notify) |
1658 | km->notify(x, c); | |
85168c00 | 1659 | rcu_read_unlock(); |
26b15dad JHS |
1660 | } |
1661 | ||
1662 | EXPORT_SYMBOL(km_policy_notify); | |
1663 | EXPORT_SYMBOL(km_state_notify); | |
1664 | ||
15e47304 | 1665 | void km_state_expired(struct xfrm_state *x, int hard, u32 portid) |
26b15dad | 1666 | { |
98806f75 | 1667 | struct net *net = xs_net(x); |
26b15dad JHS |
1668 | struct km_event c; |
1669 | ||
bf08867f | 1670 | c.data.hard = hard; |
15e47304 | 1671 | c.portid = portid; |
f60f6b8f | 1672 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1673 | km_state_notify(x, &c); |
1da177e4 LT |
1674 | |
1675 | if (hard) | |
98806f75 | 1676 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
1677 | } |
1678 | ||
53bc6b4d | 1679 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1680 | /* |
1681 | * We send to all registered managers regardless of failure | |
1682 | * We are happy with one success | |
1683 | */ | |
980ebd25 | 1684 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1685 | { |
26b15dad | 1686 | int err = -EINVAL, acqret; |
1da177e4 LT |
1687 | struct xfrm_mgr *km; |
1688 | ||
85168c00 CW |
1689 | rcu_read_lock(); |
1690 | list_for_each_entry_rcu(km, &xfrm_km_list, list) { | |
65e0736b | 1691 | acqret = km->acquire(x, t, pol); |
26b15dad JHS |
1692 | if (!acqret) |
1693 | err = acqret; | |
1da177e4 | 1694 | } |
85168c00 | 1695 | rcu_read_unlock(); |
1da177e4 LT |
1696 | return err; |
1697 | } | |
980ebd25 | 1698 | EXPORT_SYMBOL(km_query); |
1da177e4 | 1699 | |
5d36b180 | 1700 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) |
1da177e4 LT |
1701 | { |
1702 | int err = -EINVAL; | |
1703 | struct xfrm_mgr *km; | |
1704 | ||
85168c00 CW |
1705 | rcu_read_lock(); |
1706 | list_for_each_entry_rcu(km, &xfrm_km_list, list) { | |
1da177e4 LT |
1707 | if (km->new_mapping) |
1708 | err = km->new_mapping(x, ipaddr, sport); | |
1709 | if (!err) | |
1710 | break; | |
1711 | } | |
85168c00 | 1712 | rcu_read_unlock(); |
1da177e4 LT |
1713 | return err; |
1714 | } | |
1715 | EXPORT_SYMBOL(km_new_mapping); | |
1716 | ||
15e47304 | 1717 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) |
1da177e4 | 1718 | { |
98806f75 | 1719 | struct net *net = xp_net(pol); |
26b15dad | 1720 | struct km_event c; |
1da177e4 | 1721 | |
bf08867f | 1722 | c.data.hard = hard; |
15e47304 | 1723 | c.portid = portid; |
f60f6b8f | 1724 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1725 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1726 | |
1727 | if (hard) | |
98806f75 | 1728 | wake_up(&net->xfrm.km_waitq); |
1da177e4 | 1729 | } |
a70fcb0b | 1730 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1731 | |
2d60abc2 | 1732 | #ifdef CONFIG_XFRM_MIGRATE |
183cad12 DM |
1733 | int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
1734 | const struct xfrm_migrate *m, int num_migrate, | |
1735 | const struct xfrm_kmaddress *k) | |
80c9abaa SS |
1736 | { |
1737 | int err = -EINVAL; | |
1738 | int ret; | |
1739 | struct xfrm_mgr *km; | |
1740 | ||
85168c00 CW |
1741 | rcu_read_lock(); |
1742 | list_for_each_entry_rcu(km, &xfrm_km_list, list) { | |
80c9abaa | 1743 | if (km->migrate) { |
13c1d189 | 1744 | ret = km->migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
1745 | if (!ret) |
1746 | err = ret; | |
1747 | } | |
1748 | } | |
85168c00 | 1749 | rcu_read_unlock(); |
80c9abaa SS |
1750 | return err; |
1751 | } | |
1752 | EXPORT_SYMBOL(km_migrate); | |
2d60abc2 | 1753 | #endif |
80c9abaa | 1754 | |
db983c11 | 1755 | int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
97a64b45 MN |
1756 | { |
1757 | int err = -EINVAL; | |
1758 | int ret; | |
1759 | struct xfrm_mgr *km; | |
1760 | ||
85168c00 CW |
1761 | rcu_read_lock(); |
1762 | list_for_each_entry_rcu(km, &xfrm_km_list, list) { | |
97a64b45 | 1763 | if (km->report) { |
db983c11 | 1764 | ret = km->report(net, proto, sel, addr); |
97a64b45 MN |
1765 | if (!ret) |
1766 | err = ret; | |
1767 | } | |
1768 | } | |
85168c00 | 1769 | rcu_read_unlock(); |
97a64b45 MN |
1770 | return err; |
1771 | } | |
1772 | EXPORT_SYMBOL(km_report); | |
1773 | ||
1da177e4 LT |
1774 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1775 | { | |
1776 | int err; | |
1777 | u8 *data; | |
1778 | struct xfrm_mgr *km; | |
1779 | struct xfrm_policy *pol = NULL; | |
1780 | ||
1781 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1782 | return -EMSGSIZE; | |
1783 | ||
1784 | data = kmalloc(optlen, GFP_KERNEL); | |
1785 | if (!data) | |
1786 | return -ENOMEM; | |
1787 | ||
1788 | err = -EFAULT; | |
1789 | if (copy_from_user(data, optval, optlen)) | |
1790 | goto out; | |
1791 | ||
1792 | err = -EINVAL; | |
85168c00 CW |
1793 | rcu_read_lock(); |
1794 | list_for_each_entry_rcu(km, &xfrm_km_list, list) { | |
cb969f07 | 1795 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1796 | optlen, &err); |
1797 | if (err >= 0) | |
1798 | break; | |
1799 | } | |
85168c00 | 1800 | rcu_read_unlock(); |
1da177e4 LT |
1801 | |
1802 | if (err >= 0) { | |
1803 | xfrm_sk_policy_insert(sk, err, pol); | |
1804 | xfrm_pol_put(pol); | |
1805 | err = 0; | |
1806 | } | |
1807 | ||
1808 | out: | |
1809 | kfree(data); | |
1810 | return err; | |
1811 | } | |
1812 | EXPORT_SYMBOL(xfrm_user_policy); | |
1813 | ||
85168c00 CW |
1814 | static DEFINE_SPINLOCK(xfrm_km_lock); |
1815 | ||
1da177e4 LT |
1816 | int xfrm_register_km(struct xfrm_mgr *km) |
1817 | { | |
85168c00 CW |
1818 | spin_lock_bh(&xfrm_km_lock); |
1819 | list_add_tail_rcu(&km->list, &xfrm_km_list); | |
1820 | spin_unlock_bh(&xfrm_km_lock); | |
1da177e4 LT |
1821 | return 0; |
1822 | } | |
1823 | EXPORT_SYMBOL(xfrm_register_km); | |
1824 | ||
1825 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1826 | { | |
85168c00 CW |
1827 | spin_lock_bh(&xfrm_km_lock); |
1828 | list_del_rcu(&km->list); | |
1829 | spin_unlock_bh(&xfrm_km_lock); | |
1830 | synchronize_rcu(); | |
1da177e4 LT |
1831 | return 0; |
1832 | } | |
1833 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1834 | ||
1835 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1836 | { | |
1837 | int err = 0; | |
1838 | if (unlikely(afinfo == NULL)) | |
1839 | return -EINVAL; | |
1840 | if (unlikely(afinfo->family >= NPROTO)) | |
1841 | return -EAFNOSUPPORT; | |
44abdc30 | 1842 | spin_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1843 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1844 | err = -ENOBUFS; | |
edcd5821 | 1845 | else |
44abdc30 CW |
1846 | rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); |
1847 | spin_unlock_bh(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1848 | return err; |
1849 | } | |
1850 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1851 | ||
1852 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1853 | { | |
1854 | int err = 0; | |
1855 | if (unlikely(afinfo == NULL)) | |
1856 | return -EINVAL; | |
1857 | if (unlikely(afinfo->family >= NPROTO)) | |
1858 | return -EAFNOSUPPORT; | |
44abdc30 | 1859 | spin_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1860 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1861 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1862 | err = -EINVAL; | |
edcd5821 | 1863 | else |
44abdc30 | 1864 | RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); |
1da177e4 | 1865 | } |
44abdc30 CW |
1866 | spin_unlock_bh(&xfrm_state_afinfo_lock); |
1867 | synchronize_rcu(); | |
1da177e4 LT |
1868 | return err; |
1869 | } | |
1870 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1871 | ||
17c2a42a | 1872 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) |
1da177e4 LT |
1873 | { |
1874 | struct xfrm_state_afinfo *afinfo; | |
1875 | if (unlikely(family >= NPROTO)) | |
1876 | return NULL; | |
44abdc30 CW |
1877 | rcu_read_lock(); |
1878 | afinfo = rcu_dereference(xfrm_state_afinfo[family]); | |
546be240 | 1879 | if (unlikely(!afinfo)) |
44abdc30 | 1880 | rcu_read_unlock(); |
1da177e4 LT |
1881 | return afinfo; |
1882 | } | |
1883 | ||
17c2a42a | 1884 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) |
1da177e4 | 1885 | { |
44abdc30 | 1886 | rcu_read_unlock(); |
1da177e4 LT |
1887 | } |
1888 | ||
1889 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1890 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1891 | { | |
1892 | if (x->tunnel) { | |
1893 | struct xfrm_state *t = x->tunnel; | |
1894 | ||
1895 | if (atomic_read(&t->tunnel_users) == 2) | |
1896 | xfrm_state_delete(t); | |
1897 | atomic_dec(&t->tunnel_users); | |
1898 | xfrm_state_put(t); | |
1899 | x->tunnel = NULL; | |
1900 | } | |
1901 | } | |
1902 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1903 | ||
1904 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) | |
1905 | { | |
c5c25238 | 1906 | int res; |
1da177e4 | 1907 | |
c5c25238 PM |
1908 | spin_lock_bh(&x->lock); |
1909 | if (x->km.state == XFRM_STATE_VALID && | |
1910 | x->type && x->type->get_mtu) | |
1911 | res = x->type->get_mtu(x, mtu); | |
1912 | else | |
28121617 | 1913 | res = mtu - x->props.header_len; |
c5c25238 | 1914 | spin_unlock_bh(&x->lock); |
1da177e4 LT |
1915 | return res; |
1916 | } | |
1917 | ||
a454f0cc | 1918 | int __xfrm_init_state(struct xfrm_state *x, bool init_replay) |
72cb6962 | 1919 | { |
d094cd83 | 1920 | struct xfrm_state_afinfo *afinfo; |
df9dcb45 | 1921 | struct xfrm_mode *inner_mode; |
d094cd83 | 1922 | int family = x->props.family; |
72cb6962 HX |
1923 | int err; |
1924 | ||
d094cd83 HX |
1925 | err = -EAFNOSUPPORT; |
1926 | afinfo = xfrm_state_get_afinfo(family); | |
1927 | if (!afinfo) | |
1928 | goto error; | |
1929 | ||
1930 | err = 0; | |
1931 | if (afinfo->init_flags) | |
1932 | err = afinfo->init_flags(x); | |
1933 | ||
1934 | xfrm_state_put_afinfo(afinfo); | |
1935 | ||
1936 | if (err) | |
1937 | goto error; | |
1938 | ||
1939 | err = -EPROTONOSUPPORT; | |
13996378 | 1940 | |
df9dcb45 KM |
1941 | if (x->sel.family != AF_UNSPEC) { |
1942 | inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); | |
1943 | if (inner_mode == NULL) | |
1944 | goto error; | |
1945 | ||
1946 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && | |
1947 | family != x->sel.family) { | |
1948 | xfrm_put_mode(inner_mode); | |
1949 | goto error; | |
1950 | } | |
1951 | ||
1952 | x->inner_mode = inner_mode; | |
1953 | } else { | |
1954 | struct xfrm_mode *inner_mode_iaf; | |
d81d2285 | 1955 | int iafamily = AF_INET; |
df9dcb45 | 1956 | |
d81d2285 | 1957 | inner_mode = xfrm_get_mode(x->props.mode, x->props.family); |
df9dcb45 KM |
1958 | if (inner_mode == NULL) |
1959 | goto error; | |
1960 | ||
1961 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
1962 | xfrm_put_mode(inner_mode); | |
1963 | goto error; | |
1964 | } | |
d81d2285 | 1965 | x->inner_mode = inner_mode; |
df9dcb45 | 1966 | |
d81d2285 MW |
1967 | if (x->props.family == AF_INET) |
1968 | iafamily = AF_INET6; | |
df9dcb45 | 1969 | |
d81d2285 MW |
1970 | inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); |
1971 | if (inner_mode_iaf) { | |
1972 | if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) | |
1973 | x->inner_mode_iaf = inner_mode_iaf; | |
1974 | else | |
1975 | xfrm_put_mode(inner_mode_iaf); | |
df9dcb45 KM |
1976 | } |
1977 | } | |
13996378 | 1978 | |
d094cd83 | 1979 | x->type = xfrm_get_type(x->id.proto, family); |
72cb6962 HX |
1980 | if (x->type == NULL) |
1981 | goto error; | |
1982 | ||
1983 | err = x->type->init_state(x); | |
1984 | if (err) | |
1985 | goto error; | |
1986 | ||
13996378 | 1987 | x->outer_mode = xfrm_get_mode(x->props.mode, family); |
599901c3 JL |
1988 | if (x->outer_mode == NULL) { |
1989 | err = -EPROTONOSUPPORT; | |
b59f45d0 | 1990 | goto error; |
599901c3 | 1991 | } |
b59f45d0 | 1992 | |
a454f0cc WY |
1993 | if (init_replay) { |
1994 | err = xfrm_init_replay(x); | |
1995 | if (err) | |
1996 | goto error; | |
1997 | } | |
1998 | ||
72cb6962 HX |
1999 | x->km.state = XFRM_STATE_VALID; |
2000 | ||
2001 | error: | |
2002 | return err; | |
2003 | } | |
2004 | ||
a454f0cc WY |
2005 | EXPORT_SYMBOL(__xfrm_init_state); |
2006 | ||
2007 | int xfrm_init_state(struct xfrm_state *x) | |
2008 | { | |
2009 | return __xfrm_init_state(x, true); | |
2010 | } | |
2011 | ||
72cb6962 | 2012 | EXPORT_SYMBOL(xfrm_init_state); |
a716c119 | 2013 | |
d62ddc21 | 2014 | int __net_init xfrm_state_init(struct net *net) |
1da177e4 | 2015 | { |
f034b5d4 DM |
2016 | unsigned int sz; |
2017 | ||
9d4139c7 AD |
2018 | INIT_LIST_HEAD(&net->xfrm.state_all); |
2019 | ||
f034b5d4 DM |
2020 | sz = sizeof(struct hlist_head) * 8; |
2021 | ||
73d189dc AD |
2022 | net->xfrm.state_bydst = xfrm_hash_alloc(sz); |
2023 | if (!net->xfrm.state_bydst) | |
2024 | goto out_bydst; | |
d320bbb3 AD |
2025 | net->xfrm.state_bysrc = xfrm_hash_alloc(sz); |
2026 | if (!net->xfrm.state_bysrc) | |
2027 | goto out_bysrc; | |
b754a4fd AD |
2028 | net->xfrm.state_byspi = xfrm_hash_alloc(sz); |
2029 | if (!net->xfrm.state_byspi) | |
2030 | goto out_byspi; | |
529983ec | 2031 | net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); |
1da177e4 | 2032 | |
0bf7c5b0 | 2033 | net->xfrm.state_num = 0; |
63082733 | 2034 | INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); |
b8a0ae20 | 2035 | INIT_HLIST_HEAD(&net->xfrm.state_gc_list); |
c7837144 | 2036 | INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); |
50a30657 | 2037 | init_waitqueue_head(&net->xfrm.km_waitq); |
d62ddc21 | 2038 | return 0; |
73d189dc | 2039 | |
b754a4fd AD |
2040 | out_byspi: |
2041 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
d320bbb3 AD |
2042 | out_bysrc: |
2043 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
73d189dc AD |
2044 | out_bydst: |
2045 | return -ENOMEM; | |
d62ddc21 AD |
2046 | } |
2047 | ||
2048 | void xfrm_state_fini(struct net *net) | |
2049 | { | |
7c2776ee | 2050 | struct xfrm_audit audit_info; |
73d189dc AD |
2051 | unsigned int sz; |
2052 | ||
7c2776ee | 2053 | flush_work(&net->xfrm.state_hash_work); |
e1760bd5 | 2054 | audit_info.loginuid = INVALID_UID; |
7c2776ee AD |
2055 | audit_info.sessionid = -1; |
2056 | audit_info.secid = 0; | |
2057 | xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info); | |
2058 | flush_work(&net->xfrm.state_gc_work); | |
2059 | ||
9d4139c7 | 2060 | WARN_ON(!list_empty(&net->xfrm.state_all)); |
73d189dc | 2061 | |
529983ec | 2062 | sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); |
b754a4fd AD |
2063 | WARN_ON(!hlist_empty(net->xfrm.state_byspi)); |
2064 | xfrm_hash_free(net->xfrm.state_byspi, sz); | |
d320bbb3 AD |
2065 | WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); |
2066 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
73d189dc AD |
2067 | WARN_ON(!hlist_empty(net->xfrm.state_bydst)); |
2068 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
1da177e4 LT |
2069 | } |
2070 | ||
ab5f5e8b | 2071 | #ifdef CONFIG_AUDITSYSCALL |
cf35f43e IJ |
2072 | static void xfrm_audit_helper_sainfo(struct xfrm_state *x, |
2073 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2074 | { |
68277acc PM |
2075 | struct xfrm_sec_ctx *ctx = x->security; |
2076 | u32 spi = ntohl(x->id.spi); | |
2077 | ||
2078 | if (ctx) | |
ab5f5e8b | 2079 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
68277acc | 2080 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b JL |
2081 | |
2082 | switch(x->props.family) { | |
2083 | case AF_INET: | |
21454aaa HH |
2084 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2085 | &x->props.saddr.a4, &x->id.daddr.a4); | |
ab5f5e8b JL |
2086 | break; |
2087 | case AF_INET6: | |
5b095d98 | 2088 | audit_log_format(audit_buf, " src=%pI6 dst=%pI6", |
fdb46ee7 | 2089 | x->props.saddr.a6, x->id.daddr.a6); |
ab5f5e8b JL |
2090 | break; |
2091 | } | |
68277acc PM |
2092 | |
2093 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
ab5f5e8b JL |
2094 | } |
2095 | ||
cf35f43e IJ |
2096 | static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, |
2097 | struct audit_buffer *audit_buf) | |
afeb14b4 | 2098 | { |
b71d1d42 ED |
2099 | const struct iphdr *iph4; |
2100 | const struct ipv6hdr *iph6; | |
afeb14b4 PM |
2101 | |
2102 | switch (family) { | |
2103 | case AF_INET: | |
2104 | iph4 = ip_hdr(skb); | |
21454aaa HH |
2105 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2106 | &iph4->saddr, &iph4->daddr); | |
afeb14b4 PM |
2107 | break; |
2108 | case AF_INET6: | |
2109 | iph6 = ipv6_hdr(skb); | |
2110 | audit_log_format(audit_buf, | |
5b095d98 | 2111 | " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", |
fdb46ee7 | 2112 | &iph6->saddr,&iph6->daddr, |
afeb14b4 PM |
2113 | iph6->flow_lbl[0] & 0x0f, |
2114 | iph6->flow_lbl[1], | |
2115 | iph6->flow_lbl[2]); | |
2116 | break; | |
2117 | } | |
2118 | } | |
2119 | ||
68277acc | 2120 | void xfrm_audit_state_add(struct xfrm_state *x, int result, |
e1760bd5 | 2121 | kuid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2122 | { |
2123 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2124 | |
afeb14b4 | 2125 | audit_buf = xfrm_audit_start("SAD-add"); |
ab5f5e8b JL |
2126 | if (audit_buf == NULL) |
2127 | return; | |
2532386f | 2128 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2129 | xfrm_audit_helper_sainfo(x, audit_buf); |
2130 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2131 | audit_log_end(audit_buf); |
2132 | } | |
2133 | EXPORT_SYMBOL_GPL(xfrm_audit_state_add); | |
2134 | ||
68277acc | 2135 | void xfrm_audit_state_delete(struct xfrm_state *x, int result, |
e1760bd5 | 2136 | kuid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2137 | { |
2138 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2139 | |
afeb14b4 | 2140 | audit_buf = xfrm_audit_start("SAD-delete"); |
ab5f5e8b JL |
2141 | if (audit_buf == NULL) |
2142 | return; | |
2532386f | 2143 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2144 | xfrm_audit_helper_sainfo(x, audit_buf); |
2145 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2146 | audit_log_end(audit_buf); |
2147 | } | |
2148 | EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); | |
afeb14b4 PM |
2149 | |
2150 | void xfrm_audit_state_replay_overflow(struct xfrm_state *x, | |
2151 | struct sk_buff *skb) | |
2152 | { | |
2153 | struct audit_buffer *audit_buf; | |
2154 | u32 spi; | |
2155 | ||
2156 | audit_buf = xfrm_audit_start("SA-replay-overflow"); | |
2157 | if (audit_buf == NULL) | |
2158 | return; | |
2159 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2160 | /* don't record the sequence number because it's inherent in this kind | |
2161 | * of audit message */ | |
2162 | spi = ntohl(x->id.spi); | |
2163 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
2164 | audit_log_end(audit_buf); | |
2165 | } | |
2166 | EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); | |
2167 | ||
9fdc4883 | 2168 | void xfrm_audit_state_replay(struct xfrm_state *x, |
afeb14b4 PM |
2169 | struct sk_buff *skb, __be32 net_seq) |
2170 | { | |
2171 | struct audit_buffer *audit_buf; | |
2172 | u32 spi; | |
2173 | ||
2174 | audit_buf = xfrm_audit_start("SA-replayed-pkt"); | |
2175 | if (audit_buf == NULL) | |
2176 | return; | |
2177 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2178 | spi = ntohl(x->id.spi); | |
2179 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2180 | spi, spi, ntohl(net_seq)); | |
2181 | audit_log_end(audit_buf); | |
2182 | } | |
9fdc4883 | 2183 | EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); |
afeb14b4 PM |
2184 | |
2185 | void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) | |
2186 | { | |
2187 | struct audit_buffer *audit_buf; | |
2188 | ||
2189 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2190 | if (audit_buf == NULL) | |
2191 | return; | |
2192 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2193 | audit_log_end(audit_buf); | |
2194 | } | |
2195 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); | |
2196 | ||
2197 | void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, | |
2198 | __be32 net_spi, __be32 net_seq) | |
2199 | { | |
2200 | struct audit_buffer *audit_buf; | |
2201 | u32 spi; | |
2202 | ||
2203 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2204 | if (audit_buf == NULL) | |
2205 | return; | |
2206 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2207 | spi = ntohl(net_spi); | |
2208 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2209 | spi, spi, ntohl(net_seq)); | |
2210 | audit_log_end(audit_buf); | |
2211 | } | |
2212 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); | |
2213 | ||
2214 | void xfrm_audit_state_icvfail(struct xfrm_state *x, | |
2215 | struct sk_buff *skb, u8 proto) | |
2216 | { | |
2217 | struct audit_buffer *audit_buf; | |
2218 | __be32 net_spi; | |
2219 | __be32 net_seq; | |
2220 | ||
2221 | audit_buf = xfrm_audit_start("SA-icv-failure"); | |
2222 | if (audit_buf == NULL) | |
2223 | return; | |
2224 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2225 | if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { | |
2226 | u32 spi = ntohl(net_spi); | |
2227 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2228 | spi, spi, ntohl(net_seq)); | |
2229 | } | |
2230 | audit_log_end(audit_buf); | |
2231 | } | |
2232 | EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); | |
ab5f5e8b | 2233 | #endif /* CONFIG_AUDITSYSCALL */ |