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; |
9d4a706d | 41 | static unsigned int xfrm_state_genid; |
f034b5d4 | 42 | |
17c2a42a HX |
43 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); |
44 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
45 | ||
afeb14b4 PM |
46 | #ifdef CONFIG_AUDITSYSCALL |
47 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
48 | struct sk_buff *skb, __be32 net_seq); | |
49 | #else | |
50 | #define xfrm_audit_state_replay(x, s, sq) do { ; } while (0) | |
51 | #endif /* CONFIG_AUDITSYSCALL */ | |
52 | ||
64d0cd00 AD |
53 | static inline unsigned int xfrm_dst_hash(struct net *net, |
54 | xfrm_address_t *daddr, | |
c1969f29 DM |
55 | xfrm_address_t *saddr, |
56 | u32 reqid, | |
a624c108 | 57 | unsigned short family) |
f034b5d4 | 58 | { |
64d0cd00 | 59 | return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); |
f034b5d4 DM |
60 | } |
61 | ||
64d0cd00 AD |
62 | static inline unsigned int xfrm_src_hash(struct net *net, |
63 | xfrm_address_t *daddr, | |
667bbcb6 | 64 | xfrm_address_t *saddr, |
44e36b42 | 65 | unsigned short family) |
f034b5d4 | 66 | { |
64d0cd00 | 67 | return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); |
f034b5d4 DM |
68 | } |
69 | ||
f034b5d4 | 70 | static inline unsigned int |
64d0cd00 | 71 | xfrm_spi_hash(struct net *net, xfrm_address_t *daddr, __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 LT |
659 | static int |
660 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
661 | struct xfrm_tmpl *tmpl, | |
662 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
663 | unsigned short family) | |
664 | { | |
665 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
666 | if (!afinfo) | |
667 | return -1; | |
668 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
669 | xfrm_state_put_afinfo(afinfo); | |
670 | return 0; | |
671 | } | |
672 | ||
bd55775c | 673 | static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
edcd5821 | 674 | { |
221df1ed | 675 | unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); |
edcd5821 | 676 | struct xfrm_state *x; |
8f126e37 | 677 | struct hlist_node *entry; |
edcd5821 | 678 | |
221df1ed | 679 | hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) { |
edcd5821 DM |
680 | if (x->props.family != family || |
681 | x->id.spi != spi || | |
1802571b WY |
682 | x->id.proto != proto || |
683 | xfrm_addr_cmp(&x->id.daddr, daddr, family)) | |
edcd5821 DM |
684 | continue; |
685 | ||
3d6acfa7 JHS |
686 | if ((mark & x->mark.m) != x->mark.v) |
687 | continue; | |
edcd5821 DM |
688 | xfrm_state_hold(x); |
689 | return x; | |
690 | } | |
691 | ||
692 | return NULL; | |
693 | } | |
694 | ||
bd55775c | 695 | static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family) |
edcd5821 | 696 | { |
221df1ed | 697 | unsigned int h = xfrm_src_hash(net, daddr, saddr, family); |
edcd5821 | 698 | struct xfrm_state *x; |
8f126e37 | 699 | struct hlist_node *entry; |
edcd5821 | 700 | |
221df1ed | 701 | hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) { |
edcd5821 | 702 | if (x->props.family != family || |
1802571b WY |
703 | x->id.proto != proto || |
704 | xfrm_addr_cmp(&x->id.daddr, daddr, family) || | |
705 | xfrm_addr_cmp(&x->props.saddr, saddr, family)) | |
edcd5821 DM |
706 | continue; |
707 | ||
3d6acfa7 JHS |
708 | if ((mark & x->mark.m) != x->mark.v) |
709 | continue; | |
edcd5821 DM |
710 | xfrm_state_hold(x); |
711 | return x; | |
712 | } | |
713 | ||
714 | return NULL; | |
715 | } | |
716 | ||
717 | static inline struct xfrm_state * | |
718 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
719 | { | |
221df1ed | 720 | struct net *net = xs_net(x); |
bd55775c | 721 | u32 mark = x->mark.v & x->mark.m; |
221df1ed | 722 | |
edcd5821 | 723 | if (use_spi) |
bd55775c JHS |
724 | return __xfrm_state_lookup(net, mark, &x->id.daddr, |
725 | x->id.spi, x->id.proto, family); | |
edcd5821 | 726 | else |
bd55775c JHS |
727 | return __xfrm_state_lookup_byaddr(net, mark, |
728 | &x->id.daddr, | |
edcd5821 DM |
729 | &x->props.saddr, |
730 | x->id.proto, family); | |
731 | } | |
732 | ||
98806f75 | 733 | static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) |
2fab22f2 PM |
734 | { |
735 | if (have_hash_collision && | |
98806f75 AD |
736 | (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && |
737 | net->xfrm.state_num > net->xfrm.state_hmask) | |
738 | schedule_work(&net->xfrm.state_hash_work); | |
2fab22f2 PM |
739 | } |
740 | ||
08ec9af1 DM |
741 | static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, |
742 | struct flowi *fl, unsigned short family, | |
743 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
744 | struct xfrm_state **best, int *acq_in_progress, | |
745 | int *error) | |
746 | { | |
747 | /* Resolution logic: | |
748 | * 1. There is a valid state with matching selector. Done. | |
749 | * 2. Valid state with inappropriate selector. Skip. | |
750 | * | |
751 | * Entering area of "sysdeps". | |
752 | * | |
753 | * 3. If state is not valid, selector is temporary, it selects | |
754 | * only session which triggered previous resolution. Key | |
755 | * manager will do something to install a state with proper | |
756 | * selector. | |
757 | */ | |
758 | if (x->km.state == XFRM_STATE_VALID) { | |
759 | if ((x->sel.family && | |
760 | !xfrm_selector_match(&x->sel, fl, x->sel.family)) || | |
761 | !security_xfrm_state_pol_flow_match(x, pol, fl)) | |
762 | return; | |
763 | ||
764 | if (!*best || | |
765 | (*best)->km.dying > x->km.dying || | |
766 | ((*best)->km.dying == x->km.dying && | |
767 | (*best)->curlft.add_time < x->curlft.add_time)) | |
768 | *best = x; | |
769 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
770 | *acq_in_progress = 1; | |
771 | } else if (x->km.state == XFRM_STATE_ERROR || | |
772 | x->km.state == XFRM_STATE_EXPIRED) { | |
773 | if (xfrm_selector_match(&x->sel, fl, x->sel.family) && | |
774 | security_xfrm_state_pol_flow_match(x, pol, fl)) | |
775 | *error = -ESRCH; | |
776 | } | |
777 | } | |
778 | ||
1da177e4 | 779 | struct xfrm_state * |
a716c119 | 780 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
781 | struct flowi *fl, struct xfrm_tmpl *tmpl, |
782 | struct xfrm_policy *pol, int *err, | |
783 | unsigned short family) | |
784 | { | |
08ec9af1 | 785 | static xfrm_address_t saddr_wildcard = { }; |
5447c5e4 | 786 | struct net *net = xp_net(pol); |
6a783c90 | 787 | unsigned int h, h_wildcard; |
8f126e37 | 788 | struct hlist_node *entry; |
37b08e34 | 789 | struct xfrm_state *x, *x0, *to_put; |
1da177e4 LT |
790 | int acquire_in_progress = 0; |
791 | int error = 0; | |
792 | struct xfrm_state *best = NULL; | |
bd55775c | 793 | u32 mark = pol->mark.v & pol->mark.m; |
a716c119 | 794 | |
37b08e34 DM |
795 | to_put = NULL; |
796 | ||
1da177e4 | 797 | spin_lock_bh(&xfrm_state_lock); |
5447c5e4 AD |
798 | h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, family); |
799 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
1da177e4 LT |
800 | if (x->props.family == family && |
801 | x->props.reqid == tmpl->reqid && | |
3d6acfa7 | 802 | (mark & x->mark.m) == x->mark.v && |
fbd9a5b4 | 803 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
1da177e4 LT |
804 | xfrm_state_addr_check(x, daddr, saddr, family) && |
805 | tmpl->mode == x->props.mode && | |
806 | tmpl->id.proto == x->id.proto && | |
08ec9af1 DM |
807 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) |
808 | xfrm_state_look_at(pol, x, fl, family, daddr, saddr, | |
809 | &best, &acquire_in_progress, &error); | |
810 | } | |
811 | if (best) | |
812 | goto found; | |
813 | ||
6a783c90 ND |
814 | h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, family); |
815 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) { | |
08ec9af1 DM |
816 | if (x->props.family == family && |
817 | x->props.reqid == tmpl->reqid && | |
3d6acfa7 | 818 | (mark & x->mark.m) == x->mark.v && |
08ec9af1 DM |
819 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
820 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
821 | tmpl->mode == x->props.mode && | |
822 | tmpl->id.proto == x->id.proto && | |
823 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) | |
824 | xfrm_state_look_at(pol, x, fl, family, daddr, saddr, | |
825 | &best, &acquire_in_progress, &error); | |
1da177e4 LT |
826 | } |
827 | ||
08ec9af1 | 828 | found: |
1da177e4 LT |
829 | x = best; |
830 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 831 | if (tmpl->id.spi && |
bd55775c | 832 | (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi, |
edcd5821 | 833 | tmpl->id.proto, family)) != NULL) { |
37b08e34 | 834 | to_put = x0; |
1da177e4 LT |
835 | error = -EEXIST; |
836 | goto out; | |
837 | } | |
5447c5e4 | 838 | x = xfrm_state_alloc(net); |
1da177e4 LT |
839 | if (x == NULL) { |
840 | error = -ENOMEM; | |
841 | goto out; | |
842 | } | |
843 | /* Initialize temporary selector matching only | |
844 | * to current session. */ | |
845 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
bd55775c | 846 | memcpy(&x->mark, &pol->mark, sizeof(x->mark)); |
1da177e4 | 847 | |
e0d1caa7 VY |
848 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
849 | if (error) { | |
850 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 851 | to_put = x; |
e0d1caa7 VY |
852 | x = NULL; |
853 | goto out; | |
854 | } | |
855 | ||
1da177e4 LT |
856 | if (km_query(x, tmpl, pol) == 0) { |
857 | x->km.state = XFRM_STATE_ACQ; | |
5447c5e4 AD |
858 | list_add(&x->km.all, &net->xfrm.state_all); |
859 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
860 | h = xfrm_src_hash(net, daddr, saddr, family); | |
861 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
1da177e4 | 862 | if (x->id.spi) { |
5447c5e4 AD |
863 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, family); |
864 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 865 | } |
b27aeadb | 866 | x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
9e0d57fd | 867 | tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); |
5447c5e4 AD |
868 | net->xfrm.state_num++; |
869 | xfrm_hash_grow_check(net, x->bydst.next != NULL); | |
1da177e4 LT |
870 | } else { |
871 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 872 | to_put = x; |
1da177e4 LT |
873 | x = NULL; |
874 | error = -ESRCH; | |
875 | } | |
876 | } | |
877 | out: | |
878 | if (x) | |
879 | xfrm_state_hold(x); | |
880 | else | |
881 | *err = acquire_in_progress ? -EAGAIN : error; | |
882 | spin_unlock_bh(&xfrm_state_lock); | |
37b08e34 DM |
883 | if (to_put) |
884 | xfrm_state_put(to_put); | |
1da177e4 LT |
885 | return x; |
886 | } | |
887 | ||
628529b6 | 888 | struct xfrm_state * |
bd55775c | 889 | xfrm_stateonly_find(struct net *net, u32 mark, |
5447c5e4 | 890 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
628529b6 JHS |
891 | unsigned short family, u8 mode, u8 proto, u32 reqid) |
892 | { | |
4bda4f25 | 893 | unsigned int h; |
628529b6 JHS |
894 | struct xfrm_state *rx = NULL, *x = NULL; |
895 | struct hlist_node *entry; | |
896 | ||
897 | spin_lock(&xfrm_state_lock); | |
5447c5e4 AD |
898 | h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
899 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
628529b6 JHS |
900 | if (x->props.family == family && |
901 | x->props.reqid == reqid && | |
3d6acfa7 | 902 | (mark & x->mark.m) == x->mark.v && |
628529b6 JHS |
903 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
904 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
905 | mode == x->props.mode && | |
906 | proto == x->id.proto && | |
907 | x->km.state == XFRM_STATE_VALID) { | |
908 | rx = x; | |
909 | break; | |
910 | } | |
911 | } | |
912 | ||
913 | if (rx) | |
914 | xfrm_state_hold(rx); | |
915 | spin_unlock(&xfrm_state_lock); | |
916 | ||
917 | ||
918 | return rx; | |
919 | } | |
920 | EXPORT_SYMBOL(xfrm_stateonly_find); | |
921 | ||
1da177e4 LT |
922 | static void __xfrm_state_insert(struct xfrm_state *x) |
923 | { | |
98806f75 | 924 | struct net *net = xs_net(x); |
a624c108 | 925 | unsigned int h; |
1da177e4 | 926 | |
9d4a706d DM |
927 | x->genid = ++xfrm_state_genid; |
928 | ||
98806f75 | 929 | list_add(&x->km.all, &net->xfrm.state_all); |
4c563f76 | 930 | |
98806f75 | 931 | h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, |
c1969f29 | 932 | x->props.reqid, x->props.family); |
98806f75 | 933 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); |
1da177e4 | 934 | |
98806f75 AD |
935 | h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); |
936 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
1da177e4 | 937 | |
7b4dc360 | 938 | if (x->id.spi) { |
98806f75 | 939 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, |
6c44e6b7 MN |
940 | x->props.family); |
941 | ||
98806f75 | 942 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); |
6c44e6b7 MN |
943 | } |
944 | ||
9e0d57fd | 945 | tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); |
a47f0ce0 DM |
946 | if (x->replay_maxage) |
947 | mod_timer(&x->rtimer, jiffies + x->replay_maxage); | |
f8cd5488 | 948 | |
98806f75 | 949 | wake_up(&net->xfrm.km_waitq); |
f034b5d4 | 950 | |
98806f75 | 951 | net->xfrm.state_num++; |
f034b5d4 | 952 | |
98806f75 | 953 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
1da177e4 LT |
954 | } |
955 | ||
c7f5ea3a DM |
956 | /* xfrm_state_lock is held */ |
957 | static void __xfrm_state_bump_genids(struct xfrm_state *xnew) | |
958 | { | |
98806f75 | 959 | struct net *net = xs_net(xnew); |
c7f5ea3a DM |
960 | unsigned short family = xnew->props.family; |
961 | u32 reqid = xnew->props.reqid; | |
962 | struct xfrm_state *x; | |
963 | struct hlist_node *entry; | |
964 | unsigned int h; | |
3d6acfa7 | 965 | u32 mark = xnew->mark.v & xnew->mark.m; |
c7f5ea3a | 966 | |
98806f75 AD |
967 | h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); |
968 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
c7f5ea3a DM |
969 | if (x->props.family == family && |
970 | x->props.reqid == reqid && | |
3d6acfa7 | 971 | (mark & x->mark.m) == x->mark.v && |
c1969f29 DM |
972 | !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && |
973 | !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) | |
c7f5ea3a DM |
974 | x->genid = xfrm_state_genid; |
975 | } | |
976 | } | |
977 | ||
1da177e4 LT |
978 | void xfrm_state_insert(struct xfrm_state *x) |
979 | { | |
980 | spin_lock_bh(&xfrm_state_lock); | |
c7f5ea3a | 981 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
982 | __xfrm_state_insert(x); |
983 | spin_unlock_bh(&xfrm_state_lock); | |
984 | } | |
985 | EXPORT_SYMBOL(xfrm_state_insert); | |
986 | ||
2770834c | 987 | /* xfrm_state_lock is held */ |
bd55775c | 988 | 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 | 989 | { |
5447c5e4 | 990 | unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
8f126e37 | 991 | struct hlist_node *entry; |
2770834c | 992 | struct xfrm_state *x; |
3d6acfa7 | 993 | u32 mark = m->v & m->m; |
2770834c | 994 | |
5447c5e4 | 995 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { |
2770834c DM |
996 | if (x->props.reqid != reqid || |
997 | x->props.mode != mode || | |
998 | x->props.family != family || | |
999 | x->km.state != XFRM_STATE_ACQ || | |
75e252d9 | 1000 | x->id.spi != 0 || |
1802571b | 1001 | x->id.proto != proto || |
3d6acfa7 | 1002 | (mark & x->mark.m) != x->mark.v || |
1802571b WY |
1003 | xfrm_addr_cmp(&x->id.daddr, daddr, family) || |
1004 | xfrm_addr_cmp(&x->props.saddr, saddr, family)) | |
2770834c DM |
1005 | continue; |
1006 | ||
2770834c DM |
1007 | xfrm_state_hold(x); |
1008 | return x; | |
1009 | } | |
1010 | ||
1011 | if (!create) | |
1012 | return NULL; | |
1013 | ||
5447c5e4 | 1014 | x = xfrm_state_alloc(net); |
2770834c DM |
1015 | if (likely(x)) { |
1016 | switch (family) { | |
1017 | case AF_INET: | |
1018 | x->sel.daddr.a4 = daddr->a4; | |
1019 | x->sel.saddr.a4 = saddr->a4; | |
1020 | x->sel.prefixlen_d = 32; | |
1021 | x->sel.prefixlen_s = 32; | |
1022 | x->props.saddr.a4 = saddr->a4; | |
1023 | x->id.daddr.a4 = daddr->a4; | |
1024 | break; | |
1025 | ||
1026 | case AF_INET6: | |
1027 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
1028 | (struct in6_addr *)daddr); | |
1029 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
1030 | (struct in6_addr *)saddr); | |
1031 | x->sel.prefixlen_d = 128; | |
1032 | x->sel.prefixlen_s = 128; | |
1033 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
1034 | (struct in6_addr *)saddr); | |
1035 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
1036 | (struct in6_addr *)daddr); | |
1037 | break; | |
3ff50b79 | 1038 | } |
2770834c DM |
1039 | |
1040 | x->km.state = XFRM_STATE_ACQ; | |
1041 | x->id.proto = proto; | |
1042 | x->props.family = family; | |
1043 | x->props.mode = mode; | |
1044 | x->props.reqid = reqid; | |
bd55775c JHS |
1045 | x->mark.v = m->v; |
1046 | x->mark.m = m->m; | |
b27aeadb | 1047 | x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
2770834c | 1048 | xfrm_state_hold(x); |
9e0d57fd | 1049 | tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); |
5447c5e4 AD |
1050 | list_add(&x->km.all, &net->xfrm.state_all); |
1051 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
1052 | h = xfrm_src_hash(net, daddr, saddr, family); | |
1053 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
918049f0 | 1054 | |
5447c5e4 | 1055 | net->xfrm.state_num++; |
918049f0 | 1056 | |
5447c5e4 | 1057 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
2770834c DM |
1058 | } |
1059 | ||
1060 | return x; | |
1061 | } | |
1062 | ||
bd55775c | 1063 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); |
1da177e4 LT |
1064 | |
1065 | int xfrm_state_add(struct xfrm_state *x) | |
1066 | { | |
5447c5e4 | 1067 | struct net *net = xs_net(x); |
37b08e34 | 1068 | struct xfrm_state *x1, *to_put; |
1da177e4 LT |
1069 | int family; |
1070 | int err; | |
bd55775c | 1071 | u32 mark = x->mark.v & x->mark.m; |
eb2971b6 | 1072 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
1073 | |
1074 | family = x->props.family; | |
1da177e4 | 1075 | |
37b08e34 DM |
1076 | to_put = NULL; |
1077 | ||
1da177e4 LT |
1078 | spin_lock_bh(&xfrm_state_lock); |
1079 | ||
edcd5821 | 1080 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 | 1081 | if (x1) { |
37b08e34 | 1082 | to_put = x1; |
1da177e4 LT |
1083 | x1 = NULL; |
1084 | err = -EEXIST; | |
1085 | goto out; | |
1086 | } | |
1087 | ||
eb2971b6 | 1088 | if (use_spi && x->km.seq) { |
bd55775c | 1089 | x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); |
75e252d9 JL |
1090 | if (x1 && ((x1->id.proto != x->id.proto) || |
1091 | xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) { | |
37b08e34 | 1092 | to_put = x1; |
1da177e4 LT |
1093 | x1 = NULL; |
1094 | } | |
1095 | } | |
1096 | ||
eb2971b6 | 1097 | if (use_spi && !x1) |
bd55775c JHS |
1098 | x1 = __find_acq_core(net, &x->mark, family, x->props.mode, |
1099 | x->props.reqid, x->id.proto, | |
2770834c | 1100 | &x->id.daddr, &x->props.saddr, 0); |
1da177e4 | 1101 | |
c7f5ea3a | 1102 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
1103 | __xfrm_state_insert(x); |
1104 | err = 0; | |
1105 | ||
1106 | out: | |
1107 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
1108 | |
1109 | if (x1) { | |
1110 | xfrm_state_delete(x1); | |
1111 | xfrm_state_put(x1); | |
1112 | } | |
1113 | ||
37b08e34 DM |
1114 | if (to_put) |
1115 | xfrm_state_put(to_put); | |
1116 | ||
1da177e4 LT |
1117 | return err; |
1118 | } | |
1119 | EXPORT_SYMBOL(xfrm_state_add); | |
1120 | ||
80c9abaa | 1121 | #ifdef CONFIG_XFRM_MIGRATE |
6666351d | 1122 | static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) |
80c9abaa | 1123 | { |
98806f75 | 1124 | struct net *net = xs_net(orig); |
80c9abaa | 1125 | int err = -ENOMEM; |
98806f75 | 1126 | struct xfrm_state *x = xfrm_state_alloc(net); |
80c9abaa | 1127 | if (!x) |
553f9118 | 1128 | goto out; |
80c9abaa SS |
1129 | |
1130 | memcpy(&x->id, &orig->id, sizeof(x->id)); | |
1131 | memcpy(&x->sel, &orig->sel, sizeof(x->sel)); | |
1132 | memcpy(&x->lft, &orig->lft, sizeof(x->lft)); | |
1133 | x->props.mode = orig->props.mode; | |
1134 | x->props.replay_window = orig->props.replay_window; | |
1135 | x->props.reqid = orig->props.reqid; | |
1136 | x->props.family = orig->props.family; | |
1137 | x->props.saddr = orig->props.saddr; | |
1138 | ||
1139 | if (orig->aalg) { | |
4447bb33 | 1140 | x->aalg = xfrm_algo_auth_clone(orig->aalg); |
80c9abaa SS |
1141 | if (!x->aalg) |
1142 | goto error; | |
1143 | } | |
1144 | x->props.aalgo = orig->props.aalgo; | |
1145 | ||
1146 | if (orig->ealg) { | |
1147 | x->ealg = xfrm_algo_clone(orig->ealg); | |
1148 | if (!x->ealg) | |
1149 | goto error; | |
1150 | } | |
1151 | x->props.ealgo = orig->props.ealgo; | |
1152 | ||
1153 | if (orig->calg) { | |
1154 | x->calg = xfrm_algo_clone(orig->calg); | |
1155 | if (!x->calg) | |
1156 | goto error; | |
1157 | } | |
1158 | x->props.calgo = orig->props.calgo; | |
1159 | ||
a716c119 | 1160 | if (orig->encap) { |
80c9abaa SS |
1161 | x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); |
1162 | if (!x->encap) | |
1163 | goto error; | |
1164 | } | |
1165 | ||
1166 | if (orig->coaddr) { | |
1167 | x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), | |
1168 | GFP_KERNEL); | |
1169 | if (!x->coaddr) | |
1170 | goto error; | |
1171 | } | |
1172 | ||
bd55775c JHS |
1173 | memcpy(&x->mark, &orig->mark, sizeof(x->mark)); |
1174 | ||
80c9abaa SS |
1175 | err = xfrm_init_state(x); |
1176 | if (err) | |
1177 | goto error; | |
1178 | ||
1179 | x->props.flags = orig->props.flags; | |
1180 | ||
1181 | x->curlft.add_time = orig->curlft.add_time; | |
1182 | x->km.state = orig->km.state; | |
1183 | x->km.seq = orig->km.seq; | |
1184 | ||
1185 | return x; | |
1186 | ||
1187 | error: | |
553f9118 HX |
1188 | xfrm_state_put(x); |
1189 | out: | |
80c9abaa SS |
1190 | if (errp) |
1191 | *errp = err; | |
80c9abaa SS |
1192 | return NULL; |
1193 | } | |
80c9abaa SS |
1194 | |
1195 | /* xfrm_state_lock is held */ | |
1196 | struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) | |
1197 | { | |
1198 | unsigned int h; | |
1199 | struct xfrm_state *x; | |
1200 | struct hlist_node *entry; | |
1201 | ||
1202 | if (m->reqid) { | |
64d0cd00 | 1203 | h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1204 | m->reqid, m->old_family); |
73d189dc | 1205 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { |
80c9abaa SS |
1206 | if (x->props.mode != m->mode || |
1207 | x->id.proto != m->proto) | |
1208 | continue; | |
1209 | if (m->reqid && x->props.reqid != m->reqid) | |
1210 | continue; | |
1211 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1212 | m->old_family) || | |
1213 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1214 | m->old_family)) | |
1215 | continue; | |
1216 | xfrm_state_hold(x); | |
1217 | return x; | |
1218 | } | |
1219 | } else { | |
64d0cd00 | 1220 | h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1221 | m->old_family); |
d320bbb3 | 1222 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) { |
80c9abaa SS |
1223 | if (x->props.mode != m->mode || |
1224 | x->id.proto != m->proto) | |
1225 | continue; | |
1226 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1227 | m->old_family) || | |
1228 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1229 | m->old_family)) | |
1230 | continue; | |
1231 | xfrm_state_hold(x); | |
1232 | return x; | |
1233 | } | |
1234 | } | |
1235 | ||
a716c119 | 1236 | return NULL; |
80c9abaa SS |
1237 | } |
1238 | EXPORT_SYMBOL(xfrm_migrate_state_find); | |
1239 | ||
1240 | struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, | |
1241 | struct xfrm_migrate *m) | |
1242 | { | |
1243 | struct xfrm_state *xc; | |
1244 | int err; | |
1245 | ||
1246 | xc = xfrm_state_clone(x, &err); | |
1247 | if (!xc) | |
1248 | return NULL; | |
1249 | ||
1250 | memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); | |
1251 | memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); | |
1252 | ||
1253 | /* add state */ | |
1254 | if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) { | |
1255 | /* a care is needed when the destination address of the | |
1256 | state is to be updated as it is a part of triplet */ | |
1257 | xfrm_state_insert(xc); | |
1258 | } else { | |
1259 | if ((err = xfrm_state_add(xc)) < 0) | |
1260 | goto error; | |
1261 | } | |
1262 | ||
1263 | return xc; | |
1264 | error: | |
1265 | kfree(xc); | |
1266 | return NULL; | |
1267 | } | |
1268 | EXPORT_SYMBOL(xfrm_state_migrate); | |
1269 | #endif | |
1270 | ||
1da177e4 LT |
1271 | int xfrm_state_update(struct xfrm_state *x) |
1272 | { | |
37b08e34 | 1273 | struct xfrm_state *x1, *to_put; |
1da177e4 | 1274 | int err; |
eb2971b6 | 1275 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 1276 | |
37b08e34 DM |
1277 | to_put = NULL; |
1278 | ||
1da177e4 | 1279 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 1280 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
1281 | |
1282 | err = -ESRCH; | |
1283 | if (!x1) | |
1284 | goto out; | |
1285 | ||
1286 | if (xfrm_state_kern(x1)) { | |
37b08e34 | 1287 | to_put = x1; |
1da177e4 LT |
1288 | err = -EEXIST; |
1289 | goto out; | |
1290 | } | |
1291 | ||
1292 | if (x1->km.state == XFRM_STATE_ACQ) { | |
1293 | __xfrm_state_insert(x); | |
1294 | x = NULL; | |
1295 | } | |
1296 | err = 0; | |
1297 | ||
1298 | out: | |
1299 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 | 1300 | |
37b08e34 DM |
1301 | if (to_put) |
1302 | xfrm_state_put(to_put); | |
1303 | ||
1da177e4 LT |
1304 | if (err) |
1305 | return err; | |
1306 | ||
1307 | if (!x) { | |
1308 | xfrm_state_delete(x1); | |
1309 | xfrm_state_put(x1); | |
1310 | return 0; | |
1311 | } | |
1312 | ||
1313 | err = -EINVAL; | |
1314 | spin_lock_bh(&x1->lock); | |
1315 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
1316 | if (x->encap && x1->encap) | |
1317 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
1318 | if (x->coaddr && x1->coaddr) { |
1319 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
1320 | } | |
1321 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
1322 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
1323 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
1324 | x1->km.dying = 0; | |
1325 | ||
9e0d57fd | 1326 | tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); |
1da177e4 LT |
1327 | if (x1->curlft.use_time) |
1328 | xfrm_state_check_expire(x1); | |
1329 | ||
1330 | err = 0; | |
1331 | } | |
1332 | spin_unlock_bh(&x1->lock); | |
1333 | ||
1334 | xfrm_state_put(x1); | |
1335 | ||
1336 | return err; | |
1337 | } | |
1338 | EXPORT_SYMBOL(xfrm_state_update); | |
1339 | ||
1340 | int xfrm_state_check_expire(struct xfrm_state *x) | |
1341 | { | |
1342 | if (!x->curlft.use_time) | |
9d729f72 | 1343 | x->curlft.use_time = get_seconds(); |
1da177e4 LT |
1344 | |
1345 | if (x->km.state != XFRM_STATE_VALID) | |
1346 | return -EINVAL; | |
1347 | ||
1348 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
1349 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 1350 | x->km.state = XFRM_STATE_EXPIRED; |
9e0d57fd | 1351 | tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL); |
1da177e4 LT |
1352 | return -EINVAL; |
1353 | } | |
1354 | ||
1355 | if (!x->km.dying && | |
1356 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
1357 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
1358 | x->km.dying = 1; | |
53bc6b4d | 1359 | km_state_expired(x, 0, 0); |
4666faab | 1360 | } |
1da177e4 LT |
1361 | return 0; |
1362 | } | |
1363 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
1364 | ||
1da177e4 | 1365 | struct xfrm_state * |
bd55775c JHS |
1366 | xfrm_state_lookup(struct net *net, u32 mark, xfrm_address_t *daddr, __be32 spi, |
1367 | u8 proto, unsigned short family) | |
1da177e4 LT |
1368 | { |
1369 | struct xfrm_state *x; | |
1da177e4 LT |
1370 | |
1371 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1372 | x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); |
1da177e4 | 1373 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
1374 | return x; |
1375 | } | |
1376 | EXPORT_SYMBOL(xfrm_state_lookup); | |
1377 | ||
1378 | struct xfrm_state * | |
bd55775c | 1379 | xfrm_state_lookup_byaddr(struct net *net, u32 mark, |
221df1ed | 1380 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
eb2971b6 MN |
1381 | u8 proto, unsigned short family) |
1382 | { | |
1383 | struct xfrm_state *x; | |
eb2971b6 MN |
1384 | |
1385 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1386 | x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); |
eb2971b6 | 1387 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
1388 | return x; |
1389 | } | |
1390 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
1391 | ||
1392 | struct xfrm_state * | |
bd55775c | 1393 | xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto, |
a716c119 | 1394 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
1395 | int create, unsigned short family) |
1396 | { | |
1397 | struct xfrm_state *x; | |
1da177e4 LT |
1398 | |
1399 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1400 | x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 1401 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 1402 | |
1da177e4 LT |
1403 | return x; |
1404 | } | |
1405 | EXPORT_SYMBOL(xfrm_find_acq); | |
1406 | ||
41a49cc3 MN |
1407 | #ifdef CONFIG_XFRM_SUB_POLICY |
1408 | int | |
1409 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
1410 | unsigned short family) | |
1411 | { | |
1412 | int err = 0; | |
1413 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1414 | if (!afinfo) | |
1415 | return -EAFNOSUPPORT; | |
1416 | ||
1417 | spin_lock_bh(&xfrm_state_lock); | |
1418 | if (afinfo->tmpl_sort) | |
1419 | err = afinfo->tmpl_sort(dst, src, n); | |
1420 | spin_unlock_bh(&xfrm_state_lock); | |
1421 | xfrm_state_put_afinfo(afinfo); | |
1422 | return err; | |
1423 | } | |
1424 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
1425 | ||
1426 | int | |
1427 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
1428 | unsigned short family) | |
1429 | { | |
1430 | int err = 0; | |
1431 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1432 | if (!afinfo) | |
1433 | return -EAFNOSUPPORT; | |
1434 | ||
1435 | spin_lock_bh(&xfrm_state_lock); | |
1436 | if (afinfo->state_sort) | |
1437 | err = afinfo->state_sort(dst, src, n); | |
1438 | spin_unlock_bh(&xfrm_state_lock); | |
1439 | xfrm_state_put_afinfo(afinfo); | |
1440 | return err; | |
1441 | } | |
1442 | EXPORT_SYMBOL(xfrm_state_sort); | |
1443 | #endif | |
1444 | ||
1da177e4 LT |
1445 | /* Silly enough, but I'm lazy to build resolution list */ |
1446 | ||
bd55775c | 1447 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) |
1da177e4 LT |
1448 | { |
1449 | int i; | |
1da177e4 | 1450 | |
5447c5e4 | 1451 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
1452 | struct hlist_node *entry; |
1453 | struct xfrm_state *x; | |
1454 | ||
5447c5e4 | 1455 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
8f126e37 | 1456 | if (x->km.seq == seq && |
3d6acfa7 | 1457 | (mark & x->mark.m) == x->mark.v && |
8f126e37 | 1458 | x->km.state == XFRM_STATE_ACQ) { |
1da177e4 LT |
1459 | xfrm_state_hold(x); |
1460 | return x; | |
1461 | } | |
1462 | } | |
1463 | } | |
1464 | return NULL; | |
1465 | } | |
1466 | ||
bd55775c | 1467 | struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) |
1da177e4 LT |
1468 | { |
1469 | struct xfrm_state *x; | |
1470 | ||
1471 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1472 | x = __xfrm_find_acq_byseq(net, mark, seq); |
1da177e4 LT |
1473 | spin_unlock_bh(&xfrm_state_lock); |
1474 | return x; | |
1475 | } | |
1476 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1477 | ||
1478 | u32 xfrm_get_acqseq(void) | |
1479 | { | |
1480 | u32 res; | |
6836b9bd | 1481 | static atomic_t acqseq; |
1482 | ||
1483 | do { | |
1484 | res = atomic_inc_return(&acqseq); | |
1485 | } while (!res); | |
1da177e4 | 1486 | |
1da177e4 LT |
1487 | return res; |
1488 | } | |
1489 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1490 | ||
658b219e | 1491 | int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) |
1da177e4 | 1492 | { |
221df1ed | 1493 | struct net *net = xs_net(x); |
f034b5d4 | 1494 | unsigned int h; |
1da177e4 | 1495 | struct xfrm_state *x0; |
658b219e HX |
1496 | int err = -ENOENT; |
1497 | __be32 minspi = htonl(low); | |
1498 | __be32 maxspi = htonl(high); | |
bd55775c | 1499 | u32 mark = x->mark.v & x->mark.m; |
1da177e4 | 1500 | |
658b219e HX |
1501 | spin_lock_bh(&x->lock); |
1502 | if (x->km.state == XFRM_STATE_DEAD) | |
1503 | goto unlock; | |
1504 | ||
1505 | err = 0; | |
1da177e4 | 1506 | if (x->id.spi) |
658b219e HX |
1507 | goto unlock; |
1508 | ||
1509 | err = -ENOENT; | |
1da177e4 LT |
1510 | |
1511 | if (minspi == maxspi) { | |
bd55775c | 1512 | x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); |
1da177e4 LT |
1513 | if (x0) { |
1514 | xfrm_state_put(x0); | |
658b219e | 1515 | goto unlock; |
1da177e4 LT |
1516 | } |
1517 | x->id.spi = minspi; | |
1518 | } else { | |
1519 | u32 spi = 0; | |
26977b4e AV |
1520 | for (h=0; h<high-low+1; h++) { |
1521 | spi = low + net_random()%(high-low+1); | |
bd55775c | 1522 | x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
1da177e4 LT |
1523 | if (x0 == NULL) { |
1524 | x->id.spi = htonl(spi); | |
1525 | break; | |
1526 | } | |
1527 | xfrm_state_put(x0); | |
1528 | } | |
1529 | } | |
1530 | if (x->id.spi) { | |
1531 | spin_lock_bh(&xfrm_state_lock); | |
12604d8a AD |
1532 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); |
1533 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 1534 | spin_unlock_bh(&xfrm_state_lock); |
658b219e HX |
1535 | |
1536 | err = 0; | |
1da177e4 | 1537 | } |
658b219e HX |
1538 | |
1539 | unlock: | |
1540 | spin_unlock_bh(&x->lock); | |
1541 | ||
1542 | return err; | |
1da177e4 LT |
1543 | } |
1544 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1545 | ||
284fa7da | 1546 | int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, |
4c563f76 | 1547 | int (*func)(struct xfrm_state *, int, void*), |
1da177e4 LT |
1548 | void *data) |
1549 | { | |
12a169e7 HX |
1550 | struct xfrm_state *state; |
1551 | struct xfrm_state_walk *x; | |
1da177e4 LT |
1552 | int err = 0; |
1553 | ||
12a169e7 | 1554 | if (walk->seq != 0 && list_empty(&walk->all)) |
4c563f76 TT |
1555 | return 0; |
1556 | ||
1da177e4 | 1557 | spin_lock_bh(&xfrm_state_lock); |
12a169e7 | 1558 | if (list_empty(&walk->all)) |
284fa7da | 1559 | x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); |
12a169e7 HX |
1560 | else |
1561 | x = list_entry(&walk->all, struct xfrm_state_walk, all); | |
284fa7da | 1562 | list_for_each_entry_from(x, &net->xfrm.state_all, all) { |
12a169e7 | 1563 | if (x->state == XFRM_STATE_DEAD) |
4c563f76 | 1564 | continue; |
12a169e7 HX |
1565 | state = container_of(x, struct xfrm_state, km); |
1566 | if (!xfrm_id_proto_match(state->id.proto, walk->proto)) | |
4c563f76 | 1567 | continue; |
12a169e7 HX |
1568 | err = func(state, walk->seq, data); |
1569 | if (err) { | |
1570 | list_move_tail(&walk->all, &x->all); | |
1571 | goto out; | |
1da177e4 | 1572 | } |
12a169e7 | 1573 | walk->seq++; |
1da177e4 | 1574 | } |
12a169e7 | 1575 | if (walk->seq == 0) { |
1da177e4 LT |
1576 | err = -ENOENT; |
1577 | goto out; | |
1578 | } | |
12a169e7 | 1579 | list_del_init(&walk->all); |
1da177e4 LT |
1580 | out: |
1581 | spin_unlock_bh(&xfrm_state_lock); | |
1582 | return err; | |
1583 | } | |
1584 | EXPORT_SYMBOL(xfrm_state_walk); | |
1585 | ||
5c182458 HX |
1586 | void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) |
1587 | { | |
12a169e7 | 1588 | INIT_LIST_HEAD(&walk->all); |
5c182458 | 1589 | walk->proto = proto; |
12a169e7 HX |
1590 | walk->state = XFRM_STATE_DEAD; |
1591 | walk->seq = 0; | |
5c182458 HX |
1592 | } |
1593 | EXPORT_SYMBOL(xfrm_state_walk_init); | |
1594 | ||
abb81c4f HX |
1595 | void xfrm_state_walk_done(struct xfrm_state_walk *walk) |
1596 | { | |
12a169e7 | 1597 | if (list_empty(&walk->all)) |
5c182458 | 1598 | return; |
5c182458 | 1599 | |
12a169e7 HX |
1600 | spin_lock_bh(&xfrm_state_lock); |
1601 | list_del(&walk->all); | |
7d0b591c | 1602 | spin_unlock_bh(&xfrm_state_lock); |
abb81c4f HX |
1603 | } |
1604 | EXPORT_SYMBOL(xfrm_state_walk_done); | |
1605 | ||
f8cd5488 JHS |
1606 | |
1607 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
1608 | { | |
1609 | struct km_event c; | |
1610 | /* we send notify messages in case | |
1611 | * 1. we updated on of the sequence numbers, and the seqno difference | |
1612 | * is at least x->replay_maxdiff, in this case we also update the | |
1613 | * timeout of our timer function | |
1614 | * 2. if x->replay_maxage has elapsed since last update, | |
1615 | * and there were changes | |
1616 | * | |
1617 | * The state structure must be locked! | |
1618 | */ | |
1619 | ||
1620 | switch (event) { | |
1621 | case XFRM_REPLAY_UPDATE: | |
1622 | if (x->replay_maxdiff && | |
1623 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
1624 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
1625 | if (x->xflags & XFRM_TIME_DEFER) | |
1626 | event = XFRM_REPLAY_TIMEOUT; | |
1627 | else | |
1628 | return; | |
1629 | } | |
f8cd5488 JHS |
1630 | |
1631 | break; | |
1632 | ||
1633 | case XFRM_REPLAY_TIMEOUT: | |
1634 | if ((x->replay.seq == x->preplay.seq) && | |
1635 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1636 | (x->replay.oseq == x->preplay.oseq)) { |
1637 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1638 | return; |
2717096a | 1639 | } |
f8cd5488 JHS |
1640 | |
1641 | break; | |
1642 | } | |
1643 | ||
1644 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1645 | c.event = XFRM_MSG_NEWAE; | |
1646 | c.data.aevent = event; | |
1647 | km_state_notify(x, &c); | |
1648 | ||
f8cd5488 | 1649 | if (x->replay_maxage && |
a47f0ce0 | 1650 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
2717096a | 1651 | x->xflags &= ~XFRM_TIME_DEFER; |
f8cd5488 JHS |
1652 | } |
1653 | ||
1654 | static void xfrm_replay_timer_handler(unsigned long data) | |
1655 | { | |
1656 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1657 | ||
1658 | spin_lock(&x->lock); | |
1659 | ||
2717096a | 1660 | if (x->km.state == XFRM_STATE_VALID) { |
a6483b79 | 1661 | if (xfrm_aevent_is_on(xs_net(x))) |
2717096a JHS |
1662 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); |
1663 | else | |
1664 | x->xflags |= XFRM_TIME_DEFER; | |
1665 | } | |
f8cd5488 JHS |
1666 | |
1667 | spin_unlock(&x->lock); | |
1668 | } | |
1669 | ||
afeb14b4 PM |
1670 | int xfrm_replay_check(struct xfrm_state *x, |
1671 | struct sk_buff *skb, __be32 net_seq) | |
1da177e4 LT |
1672 | { |
1673 | u32 diff; | |
a252cc23 | 1674 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1675 | |
1676 | if (unlikely(seq == 0)) | |
afeb14b4 | 1677 | goto err; |
1da177e4 LT |
1678 | |
1679 | if (likely(seq > x->replay.seq)) | |
1680 | return 0; | |
1681 | ||
1682 | diff = x->replay.seq - seq; | |
4c4d51a7 HX |
1683 | if (diff >= min_t(unsigned int, x->props.replay_window, |
1684 | sizeof(x->replay.bitmap) * 8)) { | |
1da177e4 | 1685 | x->stats.replay_window++; |
afeb14b4 | 1686 | goto err; |
1da177e4 LT |
1687 | } |
1688 | ||
1689 | if (x->replay.bitmap & (1U << diff)) { | |
1690 | x->stats.replay++; | |
afeb14b4 | 1691 | goto err; |
1da177e4 LT |
1692 | } |
1693 | return 0; | |
afeb14b4 PM |
1694 | |
1695 | err: | |
1696 | xfrm_audit_state_replay(x, skb, net_seq); | |
1697 | return -EINVAL; | |
1da177e4 | 1698 | } |
1da177e4 | 1699 | |
61f4627b | 1700 | void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq) |
1da177e4 LT |
1701 | { |
1702 | u32 diff; | |
61f4627b | 1703 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1704 | |
1705 | if (seq > x->replay.seq) { | |
1706 | diff = seq - x->replay.seq; | |
1707 | if (diff < x->props.replay_window) | |
1708 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1709 | else | |
1710 | x->replay.bitmap = 1; | |
1711 | x->replay.seq = seq; | |
1712 | } else { | |
1713 | diff = x->replay.seq - seq; | |
1714 | x->replay.bitmap |= (1U << diff); | |
1715 | } | |
f8cd5488 | 1716 | |
a6483b79 | 1717 | if (xfrm_aevent_is_on(xs_net(x))) |
f8cd5488 | 1718 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); |
1da177e4 | 1719 | } |
1da177e4 | 1720 | |
df01812e | 1721 | static LIST_HEAD(xfrm_km_list); |
1da177e4 LT |
1722 | static DEFINE_RWLOCK(xfrm_km_lock); |
1723 | ||
26b15dad | 1724 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1725 | { |
1726 | struct xfrm_mgr *km; | |
1727 | ||
26b15dad JHS |
1728 | read_lock(&xfrm_km_lock); |
1729 | list_for_each_entry(km, &xfrm_km_list, list) | |
1730 | if (km->notify_policy) | |
1731 | km->notify_policy(xp, dir, c); | |
1732 | read_unlock(&xfrm_km_lock); | |
1733 | } | |
1da177e4 | 1734 | |
26b15dad JHS |
1735 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
1736 | { | |
1737 | struct xfrm_mgr *km; | |
1da177e4 LT |
1738 | read_lock(&xfrm_km_lock); |
1739 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1740 | if (km->notify) |
1741 | km->notify(x, c); | |
1da177e4 | 1742 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1743 | } |
1744 | ||
1745 | EXPORT_SYMBOL(km_policy_notify); | |
1746 | EXPORT_SYMBOL(km_state_notify); | |
1747 | ||
53bc6b4d | 1748 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad | 1749 | { |
98806f75 | 1750 | struct net *net = xs_net(x); |
26b15dad JHS |
1751 | struct km_event c; |
1752 | ||
bf08867f | 1753 | c.data.hard = hard; |
53bc6b4d | 1754 | c.pid = pid; |
f60f6b8f | 1755 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1756 | km_state_notify(x, &c); |
1da177e4 LT |
1757 | |
1758 | if (hard) | |
98806f75 | 1759 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
1760 | } |
1761 | ||
53bc6b4d | 1762 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1763 | /* |
1764 | * We send to all registered managers regardless of failure | |
1765 | * We are happy with one success | |
1766 | */ | |
980ebd25 | 1767 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1768 | { |
26b15dad | 1769 | int err = -EINVAL, acqret; |
1da177e4 LT |
1770 | struct xfrm_mgr *km; |
1771 | ||
1772 | read_lock(&xfrm_km_lock); | |
1773 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1774 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1775 | if (!acqret) | |
1776 | err = acqret; | |
1da177e4 LT |
1777 | } |
1778 | read_unlock(&xfrm_km_lock); | |
1779 | return err; | |
1780 | } | |
980ebd25 | 1781 | EXPORT_SYMBOL(km_query); |
1da177e4 | 1782 | |
5d36b180 | 1783 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) |
1da177e4 LT |
1784 | { |
1785 | int err = -EINVAL; | |
1786 | struct xfrm_mgr *km; | |
1787 | ||
1788 | read_lock(&xfrm_km_lock); | |
1789 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1790 | if (km->new_mapping) | |
1791 | err = km->new_mapping(x, ipaddr, sport); | |
1792 | if (!err) | |
1793 | break; | |
1794 | } | |
1795 | read_unlock(&xfrm_km_lock); | |
1796 | return err; | |
1797 | } | |
1798 | EXPORT_SYMBOL(km_new_mapping); | |
1799 | ||
6c5c8ca7 | 1800 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1801 | { |
98806f75 | 1802 | struct net *net = xp_net(pol); |
26b15dad | 1803 | struct km_event c; |
1da177e4 | 1804 | |
bf08867f | 1805 | c.data.hard = hard; |
6c5c8ca7 | 1806 | c.pid = pid; |
f60f6b8f | 1807 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1808 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1809 | |
1810 | if (hard) | |
98806f75 | 1811 | wake_up(&net->xfrm.km_waitq); |
1da177e4 | 1812 | } |
a70fcb0b | 1813 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1814 | |
2d60abc2 | 1815 | #ifdef CONFIG_XFRM_MIGRATE |
80c9abaa | 1816 | int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 AE |
1817 | struct xfrm_migrate *m, int num_migrate, |
1818 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
1819 | { |
1820 | int err = -EINVAL; | |
1821 | int ret; | |
1822 | struct xfrm_mgr *km; | |
1823 | ||
1824 | read_lock(&xfrm_km_lock); | |
1825 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1826 | if (km->migrate) { | |
13c1d189 | 1827 | ret = km->migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
1828 | if (!ret) |
1829 | err = ret; | |
1830 | } | |
1831 | } | |
1832 | read_unlock(&xfrm_km_lock); | |
1833 | return err; | |
1834 | } | |
1835 | EXPORT_SYMBOL(km_migrate); | |
2d60abc2 | 1836 | #endif |
80c9abaa | 1837 | |
db983c11 | 1838 | int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
97a64b45 MN |
1839 | { |
1840 | int err = -EINVAL; | |
1841 | int ret; | |
1842 | struct xfrm_mgr *km; | |
1843 | ||
1844 | read_lock(&xfrm_km_lock); | |
1845 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1846 | if (km->report) { | |
db983c11 | 1847 | ret = km->report(net, proto, sel, addr); |
97a64b45 MN |
1848 | if (!ret) |
1849 | err = ret; | |
1850 | } | |
1851 | } | |
1852 | read_unlock(&xfrm_km_lock); | |
1853 | return err; | |
1854 | } | |
1855 | EXPORT_SYMBOL(km_report); | |
1856 | ||
1da177e4 LT |
1857 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1858 | { | |
1859 | int err; | |
1860 | u8 *data; | |
1861 | struct xfrm_mgr *km; | |
1862 | struct xfrm_policy *pol = NULL; | |
1863 | ||
1864 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1865 | return -EMSGSIZE; | |
1866 | ||
1867 | data = kmalloc(optlen, GFP_KERNEL); | |
1868 | if (!data) | |
1869 | return -ENOMEM; | |
1870 | ||
1871 | err = -EFAULT; | |
1872 | if (copy_from_user(data, optval, optlen)) | |
1873 | goto out; | |
1874 | ||
1875 | err = -EINVAL; | |
1876 | read_lock(&xfrm_km_lock); | |
1877 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1878 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1879 | optlen, &err); |
1880 | if (err >= 0) | |
1881 | break; | |
1882 | } | |
1883 | read_unlock(&xfrm_km_lock); | |
1884 | ||
1885 | if (err >= 0) { | |
1886 | xfrm_sk_policy_insert(sk, err, pol); | |
1887 | xfrm_pol_put(pol); | |
1888 | err = 0; | |
1889 | } | |
1890 | ||
1891 | out: | |
1892 | kfree(data); | |
1893 | return err; | |
1894 | } | |
1895 | EXPORT_SYMBOL(xfrm_user_policy); | |
1896 | ||
1897 | int xfrm_register_km(struct xfrm_mgr *km) | |
1898 | { | |
1899 | write_lock_bh(&xfrm_km_lock); | |
1900 | list_add_tail(&km->list, &xfrm_km_list); | |
1901 | write_unlock_bh(&xfrm_km_lock); | |
1902 | return 0; | |
1903 | } | |
1904 | EXPORT_SYMBOL(xfrm_register_km); | |
1905 | ||
1906 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1907 | { | |
1908 | write_lock_bh(&xfrm_km_lock); | |
1909 | list_del(&km->list); | |
1910 | write_unlock_bh(&xfrm_km_lock); | |
1911 | return 0; | |
1912 | } | |
1913 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1914 | ||
1915 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1916 | { | |
1917 | int err = 0; | |
1918 | if (unlikely(afinfo == NULL)) | |
1919 | return -EINVAL; | |
1920 | if (unlikely(afinfo->family >= NPROTO)) | |
1921 | return -EAFNOSUPPORT; | |
f3111502 | 1922 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1923 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1924 | err = -ENOBUFS; | |
edcd5821 | 1925 | else |
1da177e4 | 1926 | xfrm_state_afinfo[afinfo->family] = afinfo; |
f3111502 | 1927 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1928 | return err; |
1929 | } | |
1930 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1931 | ||
1932 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1933 | { | |
1934 | int err = 0; | |
1935 | if (unlikely(afinfo == NULL)) | |
1936 | return -EINVAL; | |
1937 | if (unlikely(afinfo->family >= NPROTO)) | |
1938 | return -EAFNOSUPPORT; | |
f3111502 | 1939 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1940 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1941 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1942 | err = -EINVAL; | |
edcd5821 | 1943 | else |
1da177e4 | 1944 | xfrm_state_afinfo[afinfo->family] = NULL; |
1da177e4 | 1945 | } |
f3111502 | 1946 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1947 | return err; |
1948 | } | |
1949 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1950 | ||
17c2a42a | 1951 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) |
1da177e4 LT |
1952 | { |
1953 | struct xfrm_state_afinfo *afinfo; | |
1954 | if (unlikely(family >= NPROTO)) | |
1955 | return NULL; | |
1956 | read_lock(&xfrm_state_afinfo_lock); | |
1957 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1958 | if (unlikely(!afinfo)) |
1959 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1960 | return afinfo; |
1961 | } | |
1962 | ||
17c2a42a | 1963 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) |
9a429c49 | 1964 | __releases(xfrm_state_afinfo_lock) |
1da177e4 | 1965 | { |
546be240 | 1966 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1967 | } |
1968 | ||
1969 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1970 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1971 | { | |
1972 | if (x->tunnel) { | |
1973 | struct xfrm_state *t = x->tunnel; | |
1974 | ||
1975 | if (atomic_read(&t->tunnel_users) == 2) | |
1976 | xfrm_state_delete(t); | |
1977 | atomic_dec(&t->tunnel_users); | |
1978 | xfrm_state_put(t); | |
1979 | x->tunnel = NULL; | |
1980 | } | |
1981 | } | |
1982 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1983 | ||
1984 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) | |
1985 | { | |
c5c25238 | 1986 | int res; |
1da177e4 | 1987 | |
c5c25238 PM |
1988 | spin_lock_bh(&x->lock); |
1989 | if (x->km.state == XFRM_STATE_VALID && | |
1990 | x->type && x->type->get_mtu) | |
1991 | res = x->type->get_mtu(x, mtu); | |
1992 | else | |
28121617 | 1993 | res = mtu - x->props.header_len; |
c5c25238 | 1994 | spin_unlock_bh(&x->lock); |
1da177e4 LT |
1995 | return res; |
1996 | } | |
1997 | ||
72cb6962 HX |
1998 | int xfrm_init_state(struct xfrm_state *x) |
1999 | { | |
d094cd83 | 2000 | struct xfrm_state_afinfo *afinfo; |
df9dcb45 | 2001 | struct xfrm_mode *inner_mode; |
d094cd83 | 2002 | int family = x->props.family; |
72cb6962 HX |
2003 | int err; |
2004 | ||
d094cd83 HX |
2005 | err = -EAFNOSUPPORT; |
2006 | afinfo = xfrm_state_get_afinfo(family); | |
2007 | if (!afinfo) | |
2008 | goto error; | |
2009 | ||
2010 | err = 0; | |
2011 | if (afinfo->init_flags) | |
2012 | err = afinfo->init_flags(x); | |
2013 | ||
2014 | xfrm_state_put_afinfo(afinfo); | |
2015 | ||
2016 | if (err) | |
2017 | goto error; | |
2018 | ||
2019 | err = -EPROTONOSUPPORT; | |
13996378 | 2020 | |
df9dcb45 KM |
2021 | if (x->sel.family != AF_UNSPEC) { |
2022 | inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); | |
2023 | if (inner_mode == NULL) | |
2024 | goto error; | |
2025 | ||
2026 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && | |
2027 | family != x->sel.family) { | |
2028 | xfrm_put_mode(inner_mode); | |
2029 | goto error; | |
2030 | } | |
2031 | ||
2032 | x->inner_mode = inner_mode; | |
2033 | } else { | |
2034 | struct xfrm_mode *inner_mode_iaf; | |
d81d2285 | 2035 | int iafamily = AF_INET; |
df9dcb45 | 2036 | |
d81d2285 | 2037 | inner_mode = xfrm_get_mode(x->props.mode, x->props.family); |
df9dcb45 KM |
2038 | if (inner_mode == NULL) |
2039 | goto error; | |
2040 | ||
2041 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
2042 | xfrm_put_mode(inner_mode); | |
2043 | goto error; | |
2044 | } | |
d81d2285 | 2045 | x->inner_mode = inner_mode; |
df9dcb45 | 2046 | |
d81d2285 MW |
2047 | if (x->props.family == AF_INET) |
2048 | iafamily = AF_INET6; | |
df9dcb45 | 2049 | |
d81d2285 MW |
2050 | inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); |
2051 | if (inner_mode_iaf) { | |
2052 | if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) | |
2053 | x->inner_mode_iaf = inner_mode_iaf; | |
2054 | else | |
2055 | xfrm_put_mode(inner_mode_iaf); | |
df9dcb45 KM |
2056 | } |
2057 | } | |
13996378 | 2058 | |
d094cd83 | 2059 | x->type = xfrm_get_type(x->id.proto, family); |
72cb6962 HX |
2060 | if (x->type == NULL) |
2061 | goto error; | |
2062 | ||
2063 | err = x->type->init_state(x); | |
2064 | if (err) | |
2065 | goto error; | |
2066 | ||
13996378 HX |
2067 | x->outer_mode = xfrm_get_mode(x->props.mode, family); |
2068 | if (x->outer_mode == NULL) | |
b59f45d0 HX |
2069 | goto error; |
2070 | ||
72cb6962 HX |
2071 | x->km.state = XFRM_STATE_VALID; |
2072 | ||
2073 | error: | |
2074 | return err; | |
2075 | } | |
2076 | ||
2077 | EXPORT_SYMBOL(xfrm_init_state); | |
a716c119 | 2078 | |
d62ddc21 | 2079 | int __net_init xfrm_state_init(struct net *net) |
1da177e4 | 2080 | { |
f034b5d4 DM |
2081 | unsigned int sz; |
2082 | ||
9d4139c7 AD |
2083 | INIT_LIST_HEAD(&net->xfrm.state_all); |
2084 | ||
f034b5d4 DM |
2085 | sz = sizeof(struct hlist_head) * 8; |
2086 | ||
73d189dc AD |
2087 | net->xfrm.state_bydst = xfrm_hash_alloc(sz); |
2088 | if (!net->xfrm.state_bydst) | |
2089 | goto out_bydst; | |
d320bbb3 AD |
2090 | net->xfrm.state_bysrc = xfrm_hash_alloc(sz); |
2091 | if (!net->xfrm.state_bysrc) | |
2092 | goto out_bysrc; | |
b754a4fd AD |
2093 | net->xfrm.state_byspi = xfrm_hash_alloc(sz); |
2094 | if (!net->xfrm.state_byspi) | |
2095 | goto out_byspi; | |
529983ec | 2096 | net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); |
1da177e4 | 2097 | |
0bf7c5b0 | 2098 | net->xfrm.state_num = 0; |
63082733 | 2099 | INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); |
b8a0ae20 | 2100 | INIT_HLIST_HEAD(&net->xfrm.state_gc_list); |
c7837144 | 2101 | INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); |
50a30657 | 2102 | init_waitqueue_head(&net->xfrm.km_waitq); |
d62ddc21 | 2103 | return 0; |
73d189dc | 2104 | |
b754a4fd AD |
2105 | out_byspi: |
2106 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
d320bbb3 AD |
2107 | out_bysrc: |
2108 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
73d189dc AD |
2109 | out_bydst: |
2110 | return -ENOMEM; | |
d62ddc21 AD |
2111 | } |
2112 | ||
2113 | void xfrm_state_fini(struct net *net) | |
2114 | { | |
7c2776ee | 2115 | struct xfrm_audit audit_info; |
73d189dc AD |
2116 | unsigned int sz; |
2117 | ||
7c2776ee AD |
2118 | flush_work(&net->xfrm.state_hash_work); |
2119 | audit_info.loginuid = -1; | |
2120 | audit_info.sessionid = -1; | |
2121 | audit_info.secid = 0; | |
2122 | xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info); | |
2123 | flush_work(&net->xfrm.state_gc_work); | |
2124 | ||
9d4139c7 | 2125 | WARN_ON(!list_empty(&net->xfrm.state_all)); |
73d189dc | 2126 | |
529983ec | 2127 | sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); |
b754a4fd AD |
2128 | WARN_ON(!hlist_empty(net->xfrm.state_byspi)); |
2129 | xfrm_hash_free(net->xfrm.state_byspi, sz); | |
d320bbb3 AD |
2130 | WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); |
2131 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
73d189dc AD |
2132 | WARN_ON(!hlist_empty(net->xfrm.state_bydst)); |
2133 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
1da177e4 LT |
2134 | } |
2135 | ||
ab5f5e8b | 2136 | #ifdef CONFIG_AUDITSYSCALL |
cf35f43e IJ |
2137 | static void xfrm_audit_helper_sainfo(struct xfrm_state *x, |
2138 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2139 | { |
68277acc PM |
2140 | struct xfrm_sec_ctx *ctx = x->security; |
2141 | u32 spi = ntohl(x->id.spi); | |
2142 | ||
2143 | if (ctx) | |
ab5f5e8b | 2144 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
68277acc | 2145 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b JL |
2146 | |
2147 | switch(x->props.family) { | |
2148 | case AF_INET: | |
21454aaa HH |
2149 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2150 | &x->props.saddr.a4, &x->id.daddr.a4); | |
ab5f5e8b JL |
2151 | break; |
2152 | case AF_INET6: | |
5b095d98 | 2153 | audit_log_format(audit_buf, " src=%pI6 dst=%pI6", |
fdb46ee7 | 2154 | x->props.saddr.a6, x->id.daddr.a6); |
ab5f5e8b JL |
2155 | break; |
2156 | } | |
68277acc PM |
2157 | |
2158 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
ab5f5e8b JL |
2159 | } |
2160 | ||
cf35f43e IJ |
2161 | static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, |
2162 | struct audit_buffer *audit_buf) | |
afeb14b4 PM |
2163 | { |
2164 | struct iphdr *iph4; | |
2165 | struct ipv6hdr *iph6; | |
2166 | ||
2167 | switch (family) { | |
2168 | case AF_INET: | |
2169 | iph4 = ip_hdr(skb); | |
21454aaa HH |
2170 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2171 | &iph4->saddr, &iph4->daddr); | |
afeb14b4 PM |
2172 | break; |
2173 | case AF_INET6: | |
2174 | iph6 = ipv6_hdr(skb); | |
2175 | audit_log_format(audit_buf, | |
5b095d98 | 2176 | " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", |
fdb46ee7 | 2177 | &iph6->saddr,&iph6->daddr, |
afeb14b4 PM |
2178 | iph6->flow_lbl[0] & 0x0f, |
2179 | iph6->flow_lbl[1], | |
2180 | iph6->flow_lbl[2]); | |
2181 | break; | |
2182 | } | |
2183 | } | |
2184 | ||
68277acc | 2185 | void xfrm_audit_state_add(struct xfrm_state *x, int result, |
2532386f | 2186 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2187 | { |
2188 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2189 | |
afeb14b4 | 2190 | audit_buf = xfrm_audit_start("SAD-add"); |
ab5f5e8b JL |
2191 | if (audit_buf == NULL) |
2192 | return; | |
2532386f | 2193 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2194 | xfrm_audit_helper_sainfo(x, audit_buf); |
2195 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2196 | audit_log_end(audit_buf); |
2197 | } | |
2198 | EXPORT_SYMBOL_GPL(xfrm_audit_state_add); | |
2199 | ||
68277acc | 2200 | void xfrm_audit_state_delete(struct xfrm_state *x, int result, |
2532386f | 2201 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2202 | { |
2203 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2204 | |
afeb14b4 | 2205 | audit_buf = xfrm_audit_start("SAD-delete"); |
ab5f5e8b JL |
2206 | if (audit_buf == NULL) |
2207 | return; | |
2532386f | 2208 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2209 | xfrm_audit_helper_sainfo(x, audit_buf); |
2210 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2211 | audit_log_end(audit_buf); |
2212 | } | |
2213 | EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); | |
afeb14b4 PM |
2214 | |
2215 | void xfrm_audit_state_replay_overflow(struct xfrm_state *x, | |
2216 | struct sk_buff *skb) | |
2217 | { | |
2218 | struct audit_buffer *audit_buf; | |
2219 | u32 spi; | |
2220 | ||
2221 | audit_buf = xfrm_audit_start("SA-replay-overflow"); | |
2222 | if (audit_buf == NULL) | |
2223 | return; | |
2224 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2225 | /* don't record the sequence number because it's inherent in this kind | |
2226 | * of audit message */ | |
2227 | spi = ntohl(x->id.spi); | |
2228 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
2229 | audit_log_end(audit_buf); | |
2230 | } | |
2231 | EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); | |
2232 | ||
2233 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
2234 | struct sk_buff *skb, __be32 net_seq) | |
2235 | { | |
2236 | struct audit_buffer *audit_buf; | |
2237 | u32 spi; | |
2238 | ||
2239 | audit_buf = xfrm_audit_start("SA-replayed-pkt"); | |
2240 | if (audit_buf == NULL) | |
2241 | return; | |
2242 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2243 | spi = ntohl(x->id.spi); | |
2244 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2245 | spi, spi, ntohl(net_seq)); | |
2246 | audit_log_end(audit_buf); | |
2247 | } | |
2248 | ||
2249 | void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) | |
2250 | { | |
2251 | struct audit_buffer *audit_buf; | |
2252 | ||
2253 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2254 | if (audit_buf == NULL) | |
2255 | return; | |
2256 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2257 | audit_log_end(audit_buf); | |
2258 | } | |
2259 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); | |
2260 | ||
2261 | void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, | |
2262 | __be32 net_spi, __be32 net_seq) | |
2263 | { | |
2264 | struct audit_buffer *audit_buf; | |
2265 | u32 spi; | |
2266 | ||
2267 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2268 | if (audit_buf == NULL) | |
2269 | return; | |
2270 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2271 | spi = ntohl(net_spi); | |
2272 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2273 | spi, spi, ntohl(net_seq)); | |
2274 | audit_log_end(audit_buf); | |
2275 | } | |
2276 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); | |
2277 | ||
2278 | void xfrm_audit_state_icvfail(struct xfrm_state *x, | |
2279 | struct sk_buff *skb, u8 proto) | |
2280 | { | |
2281 | struct audit_buffer *audit_buf; | |
2282 | __be32 net_spi; | |
2283 | __be32 net_seq; | |
2284 | ||
2285 | audit_buf = xfrm_audit_start("SA-icv-failure"); | |
2286 | if (audit_buf == NULL) | |
2287 | return; | |
2288 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2289 | if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { | |
2290 | u32 spi = ntohl(net_spi); | |
2291 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2292 | spi, spi, ntohl(net_seq)); | |
2293 | } | |
2294 | audit_log_end(audit_buf); | |
2295 | } | |
2296 | EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); | |
ab5f5e8b | 2297 | #endif /* CONFIG_AUDITSYSCALL */ |