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 YP |
24 | #include <linux/ktime.h> |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/kernel.h> | |
1da177e4 | 27 | |
44e36b42 DM |
28 | #include "xfrm_hash.h" |
29 | ||
1da177e4 LT |
30 | /* Each xfrm_state may be linked to two tables: |
31 | ||
32 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) | |
a624c108 | 33 | 2. Hash table by (daddr,family,reqid) to find what SAs exist for given |
1da177e4 LT |
34 | destination/tunnel endpoint. (output) |
35 | */ | |
36 | ||
37 | static DEFINE_SPINLOCK(xfrm_state_lock); | |
38 | ||
f034b5d4 | 39 | static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; |
9d4a706d | 40 | static unsigned int xfrm_state_genid; |
f034b5d4 | 41 | |
17c2a42a HX |
42 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); |
43 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
44 | ||
afeb14b4 PM |
45 | #ifdef CONFIG_AUDITSYSCALL |
46 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
47 | struct sk_buff *skb, __be32 net_seq); | |
48 | #else | |
49 | #define xfrm_audit_state_replay(x, s, sq) do { ; } while (0) | |
50 | #endif /* CONFIG_AUDITSYSCALL */ | |
51 | ||
64d0cd00 AD |
52 | static inline unsigned int xfrm_dst_hash(struct net *net, |
53 | xfrm_address_t *daddr, | |
c1969f29 DM |
54 | xfrm_address_t *saddr, |
55 | u32 reqid, | |
a624c108 | 56 | unsigned short family) |
f034b5d4 | 57 | { |
64d0cd00 | 58 | return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); |
f034b5d4 DM |
59 | } |
60 | ||
64d0cd00 AD |
61 | static inline unsigned int xfrm_src_hash(struct net *net, |
62 | xfrm_address_t *daddr, | |
667bbcb6 | 63 | xfrm_address_t *saddr, |
44e36b42 | 64 | unsigned short family) |
f034b5d4 | 65 | { |
64d0cd00 | 66 | return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); |
f034b5d4 DM |
67 | } |
68 | ||
f034b5d4 | 69 | static inline unsigned int |
64d0cd00 | 70 | xfrm_spi_hash(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
f034b5d4 | 71 | { |
64d0cd00 | 72 | return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); |
f034b5d4 DM |
73 | } |
74 | ||
f034b5d4 DM |
75 | static void xfrm_hash_transfer(struct hlist_head *list, |
76 | struct hlist_head *ndsttable, | |
77 | struct hlist_head *nsrctable, | |
78 | struct hlist_head *nspitable, | |
79 | unsigned int nhashmask) | |
80 | { | |
81 | struct hlist_node *entry, *tmp; | |
82 | struct xfrm_state *x; | |
83 | ||
84 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
85 | unsigned int h; | |
86 | ||
c1969f29 DM |
87 | h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
88 | x->props.reqid, x->props.family, | |
89 | nhashmask); | |
f034b5d4 DM |
90 | hlist_add_head(&x->bydst, ndsttable+h); |
91 | ||
667bbcb6 MN |
92 | h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, |
93 | x->props.family, | |
f034b5d4 DM |
94 | nhashmask); |
95 | hlist_add_head(&x->bysrc, nsrctable+h); | |
96 | ||
7b4dc360 MN |
97 | if (x->id.spi) { |
98 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, | |
99 | x->id.proto, x->props.family, | |
100 | nhashmask); | |
101 | hlist_add_head(&x->byspi, nspitable+h); | |
102 | } | |
f034b5d4 DM |
103 | } |
104 | } | |
105 | ||
63082733 | 106 | static unsigned long xfrm_hash_new_size(unsigned int state_hmask) |
f034b5d4 | 107 | { |
63082733 | 108 | return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); |
f034b5d4 DM |
109 | } |
110 | ||
111 | static DEFINE_MUTEX(hash_resize_mutex); | |
112 | ||
63082733 | 113 | static void xfrm_hash_resize(struct work_struct *work) |
f034b5d4 | 114 | { |
63082733 | 115 | struct net *net = container_of(work, struct net, xfrm.state_hash_work); |
f034b5d4 DM |
116 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; |
117 | unsigned long nsize, osize; | |
118 | unsigned int nhashmask, ohashmask; | |
119 | int i; | |
120 | ||
121 | mutex_lock(&hash_resize_mutex); | |
122 | ||
63082733 | 123 | nsize = xfrm_hash_new_size(net->xfrm.state_hmask); |
44e36b42 | 124 | ndst = xfrm_hash_alloc(nsize); |
f034b5d4 DM |
125 | if (!ndst) |
126 | goto out_unlock; | |
44e36b42 | 127 | nsrc = xfrm_hash_alloc(nsize); |
f034b5d4 | 128 | if (!nsrc) { |
44e36b42 | 129 | xfrm_hash_free(ndst, nsize); |
f034b5d4 DM |
130 | goto out_unlock; |
131 | } | |
44e36b42 | 132 | nspi = xfrm_hash_alloc(nsize); |
f034b5d4 | 133 | if (!nspi) { |
44e36b42 DM |
134 | xfrm_hash_free(ndst, nsize); |
135 | xfrm_hash_free(nsrc, nsize); | |
f034b5d4 DM |
136 | goto out_unlock; |
137 | } | |
138 | ||
139 | spin_lock_bh(&xfrm_state_lock); | |
140 | ||
141 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
63082733 AD |
142 | for (i = net->xfrm.state_hmask; i >= 0; i--) |
143 | xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi, | |
f034b5d4 DM |
144 | nhashmask); |
145 | ||
63082733 AD |
146 | odst = net->xfrm.state_bydst; |
147 | osrc = net->xfrm.state_bysrc; | |
148 | ospi = net->xfrm.state_byspi; | |
149 | ohashmask = net->xfrm.state_hmask; | |
f034b5d4 | 150 | |
63082733 AD |
151 | net->xfrm.state_bydst = ndst; |
152 | net->xfrm.state_bysrc = nsrc; | |
153 | net->xfrm.state_byspi = nspi; | |
154 | net->xfrm.state_hmask = nhashmask; | |
f034b5d4 DM |
155 | |
156 | spin_unlock_bh(&xfrm_state_lock); | |
157 | ||
158 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 DM |
159 | xfrm_hash_free(odst, osize); |
160 | xfrm_hash_free(osrc, osize); | |
161 | xfrm_hash_free(ospi, osize); | |
f034b5d4 DM |
162 | |
163 | out_unlock: | |
164 | mutex_unlock(&hash_resize_mutex); | |
165 | } | |
166 | ||
1da177e4 LT |
167 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); |
168 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
169 | ||
1da177e4 LT |
170 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
171 | ||
53bc6b4d | 172 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 | 173 | |
980ebd25 | 174 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d | 175 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
1da177e4 | 176 | |
aa5d62cc HX |
177 | static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family) |
178 | { | |
179 | struct xfrm_state_afinfo *afinfo; | |
180 | if (unlikely(family >= NPROTO)) | |
181 | return NULL; | |
182 | write_lock_bh(&xfrm_state_afinfo_lock); | |
183 | afinfo = xfrm_state_afinfo[family]; | |
184 | if (unlikely(!afinfo)) | |
185 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
186 | return afinfo; | |
187 | } | |
188 | ||
189 | static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo) | |
9a429c49 | 190 | __releases(xfrm_state_afinfo_lock) |
aa5d62cc HX |
191 | { |
192 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
193 | } | |
194 | ||
533cb5b0 | 195 | int xfrm_register_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
196 | { |
197 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 198 | const struct xfrm_type **typemap; |
aa5d62cc HX |
199 | int err = 0; |
200 | ||
201 | if (unlikely(afinfo == NULL)) | |
202 | return -EAFNOSUPPORT; | |
203 | typemap = afinfo->type_map; | |
204 | ||
205 | if (likely(typemap[type->proto] == NULL)) | |
206 | typemap[type->proto] = type; | |
207 | else | |
208 | err = -EEXIST; | |
209 | xfrm_state_unlock_afinfo(afinfo); | |
210 | return err; | |
211 | } | |
212 | EXPORT_SYMBOL(xfrm_register_type); | |
213 | ||
533cb5b0 | 214 | int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
215 | { |
216 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 217 | const struct xfrm_type **typemap; |
aa5d62cc HX |
218 | int err = 0; |
219 | ||
220 | if (unlikely(afinfo == NULL)) | |
221 | return -EAFNOSUPPORT; | |
222 | typemap = afinfo->type_map; | |
223 | ||
224 | if (unlikely(typemap[type->proto] != type)) | |
225 | err = -ENOENT; | |
226 | else | |
227 | typemap[type->proto] = NULL; | |
228 | xfrm_state_unlock_afinfo(afinfo); | |
229 | return err; | |
230 | } | |
231 | EXPORT_SYMBOL(xfrm_unregister_type); | |
232 | ||
533cb5b0 | 233 | static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) |
aa5d62cc HX |
234 | { |
235 | struct xfrm_state_afinfo *afinfo; | |
533cb5b0 ED |
236 | const struct xfrm_type **typemap; |
237 | const struct xfrm_type *type; | |
aa5d62cc HX |
238 | int modload_attempted = 0; |
239 | ||
240 | retry: | |
241 | afinfo = xfrm_state_get_afinfo(family); | |
242 | if (unlikely(afinfo == NULL)) | |
243 | return NULL; | |
244 | typemap = afinfo->type_map; | |
245 | ||
246 | type = typemap[proto]; | |
247 | if (unlikely(type && !try_module_get(type->owner))) | |
248 | type = NULL; | |
249 | if (!type && !modload_attempted) { | |
250 | xfrm_state_put_afinfo(afinfo); | |
251 | request_module("xfrm-type-%d-%d", family, proto); | |
252 | modload_attempted = 1; | |
253 | goto retry; | |
254 | } | |
255 | ||
256 | xfrm_state_put_afinfo(afinfo); | |
257 | return type; | |
258 | } | |
259 | ||
533cb5b0 | 260 | static void xfrm_put_type(const struct xfrm_type *type) |
aa5d62cc HX |
261 | { |
262 | module_put(type->owner); | |
263 | } | |
264 | ||
265 | int xfrm_register_mode(struct xfrm_mode *mode, int family) | |
266 | { | |
267 | struct xfrm_state_afinfo *afinfo; | |
268 | struct xfrm_mode **modemap; | |
269 | int err; | |
270 | ||
271 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
272 | return -EINVAL; | |
273 | ||
274 | afinfo = xfrm_state_lock_afinfo(family); | |
275 | if (unlikely(afinfo == NULL)) | |
276 | return -EAFNOSUPPORT; | |
277 | ||
278 | err = -EEXIST; | |
279 | modemap = afinfo->mode_map; | |
17c2a42a HX |
280 | if (modemap[mode->encap]) |
281 | goto out; | |
aa5d62cc | 282 | |
17c2a42a HX |
283 | err = -ENOENT; |
284 | if (!try_module_get(afinfo->owner)) | |
285 | goto out; | |
286 | ||
287 | mode->afinfo = afinfo; | |
288 | modemap[mode->encap] = mode; | |
289 | err = 0; | |
290 | ||
291 | out: | |
aa5d62cc HX |
292 | xfrm_state_unlock_afinfo(afinfo); |
293 | return err; | |
294 | } | |
295 | EXPORT_SYMBOL(xfrm_register_mode); | |
296 | ||
297 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
298 | { | |
299 | struct xfrm_state_afinfo *afinfo; | |
300 | struct xfrm_mode **modemap; | |
301 | int err; | |
302 | ||
303 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
304 | return -EINVAL; | |
305 | ||
306 | afinfo = xfrm_state_lock_afinfo(family); | |
307 | if (unlikely(afinfo == NULL)) | |
308 | return -EAFNOSUPPORT; | |
309 | ||
310 | err = -ENOENT; | |
311 | modemap = afinfo->mode_map; | |
312 | if (likely(modemap[mode->encap] == mode)) { | |
313 | modemap[mode->encap] = NULL; | |
17c2a42a | 314 | module_put(mode->afinfo->owner); |
aa5d62cc HX |
315 | err = 0; |
316 | } | |
317 | ||
318 | xfrm_state_unlock_afinfo(afinfo); | |
319 | return err; | |
320 | } | |
321 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
322 | ||
323 | static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
324 | { | |
325 | struct xfrm_state_afinfo *afinfo; | |
326 | struct xfrm_mode *mode; | |
327 | int modload_attempted = 0; | |
328 | ||
329 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
330 | return NULL; | |
331 | ||
332 | retry: | |
333 | afinfo = xfrm_state_get_afinfo(family); | |
334 | if (unlikely(afinfo == NULL)) | |
335 | return NULL; | |
336 | ||
337 | mode = afinfo->mode_map[encap]; | |
338 | if (unlikely(mode && !try_module_get(mode->owner))) | |
339 | mode = NULL; | |
340 | if (!mode && !modload_attempted) { | |
341 | xfrm_state_put_afinfo(afinfo); | |
342 | request_module("xfrm-mode-%d-%d", family, encap); | |
343 | modload_attempted = 1; | |
344 | goto retry; | |
345 | } | |
346 | ||
347 | xfrm_state_put_afinfo(afinfo); | |
348 | return mode; | |
349 | } | |
350 | ||
351 | static void xfrm_put_mode(struct xfrm_mode *mode) | |
352 | { | |
353 | module_put(mode->owner); | |
354 | } | |
355 | ||
1da177e4 LT |
356 | static void xfrm_state_gc_destroy(struct xfrm_state *x) |
357 | { | |
9e0d57fd | 358 | tasklet_hrtimer_cancel(&x->mtimer); |
a47f0ce0 | 359 | del_timer_sync(&x->rtimer); |
a51482bd JJ |
360 | kfree(x->aalg); |
361 | kfree(x->ealg); | |
362 | kfree(x->calg); | |
363 | kfree(x->encap); | |
060f02a3 | 364 | kfree(x->coaddr); |
13996378 HX |
365 | if (x->inner_mode) |
366 | xfrm_put_mode(x->inner_mode); | |
df9dcb45 KM |
367 | if (x->inner_mode_iaf) |
368 | xfrm_put_mode(x->inner_mode_iaf); | |
13996378 HX |
369 | if (x->outer_mode) |
370 | xfrm_put_mode(x->outer_mode); | |
1da177e4 LT |
371 | if (x->type) { |
372 | x->type->destructor(x); | |
373 | xfrm_put_type(x->type); | |
374 | } | |
df71837d | 375 | security_xfrm_state_free(x); |
1da177e4 LT |
376 | kfree(x); |
377 | } | |
378 | ||
c7837144 | 379 | static void xfrm_state_gc_task(struct work_struct *work) |
1da177e4 | 380 | { |
c7837144 | 381 | struct net *net = container_of(work, struct net, xfrm.state_gc_work); |
12a169e7 HX |
382 | struct xfrm_state *x; |
383 | struct hlist_node *entry, *tmp; | |
384 | struct hlist_head gc_list; | |
1da177e4 | 385 | |
1da177e4 | 386 | spin_lock_bh(&xfrm_state_gc_lock); |
c7837144 | 387 | hlist_move_list(&net->xfrm.state_gc_list, &gc_list); |
1da177e4 LT |
388 | spin_unlock_bh(&xfrm_state_gc_lock); |
389 | ||
12a169e7 | 390 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist) |
1da177e4 | 391 | xfrm_state_gc_destroy(x); |
8f126e37 | 392 | |
50a30657 | 393 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
394 | } |
395 | ||
396 | static inline unsigned long make_jiffies(long secs) | |
397 | { | |
398 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
399 | return MAX_SCHEDULE_TIMEOUT-1; | |
400 | else | |
a716c119 | 401 | return secs*HZ; |
1da177e4 LT |
402 | } |
403 | ||
9e0d57fd | 404 | static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me) |
1da177e4 | 405 | { |
9e0d57fd YP |
406 | struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer); |
407 | struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer); | |
98806f75 | 408 | struct net *net = xs_net(x); |
9d729f72 | 409 | unsigned long now = get_seconds(); |
1da177e4 LT |
410 | long next = LONG_MAX; |
411 | int warn = 0; | |
161a09e7 | 412 | int err = 0; |
1da177e4 LT |
413 | |
414 | spin_lock(&x->lock); | |
415 | if (x->km.state == XFRM_STATE_DEAD) | |
416 | goto out; | |
417 | if (x->km.state == XFRM_STATE_EXPIRED) | |
418 | goto expired; | |
419 | if (x->lft.hard_add_expires_seconds) { | |
420 | long tmo = x->lft.hard_add_expires_seconds + | |
421 | x->curlft.add_time - now; | |
422 | if (tmo <= 0) | |
423 | goto expired; | |
424 | if (tmo < next) | |
425 | next = tmo; | |
426 | } | |
427 | if (x->lft.hard_use_expires_seconds) { | |
428 | long tmo = x->lft.hard_use_expires_seconds + | |
429 | (x->curlft.use_time ? : now) - now; | |
430 | if (tmo <= 0) | |
431 | goto expired; | |
432 | if (tmo < next) | |
433 | next = tmo; | |
434 | } | |
435 | if (x->km.dying) | |
436 | goto resched; | |
437 | if (x->lft.soft_add_expires_seconds) { | |
438 | long tmo = x->lft.soft_add_expires_seconds + | |
439 | x->curlft.add_time - now; | |
440 | if (tmo <= 0) | |
441 | warn = 1; | |
442 | else if (tmo < next) | |
443 | next = tmo; | |
444 | } | |
445 | if (x->lft.soft_use_expires_seconds) { | |
446 | long tmo = x->lft.soft_use_expires_seconds + | |
447 | (x->curlft.use_time ? : now) - now; | |
448 | if (tmo <= 0) | |
449 | warn = 1; | |
450 | else if (tmo < next) | |
451 | next = tmo; | |
452 | } | |
453 | ||
4666faab | 454 | x->km.dying = warn; |
1da177e4 | 455 | if (warn) |
53bc6b4d | 456 | km_state_expired(x, 0, 0); |
1da177e4 | 457 | resched: |
9e0d57fd YP |
458 | if (next != LONG_MAX){ |
459 | tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL); | |
460 | } | |
a47f0ce0 | 461 | |
1da177e4 LT |
462 | goto out; |
463 | ||
464 | expired: | |
465 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
466 | x->km.state = XFRM_STATE_EXPIRED; | |
98806f75 | 467 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
468 | next = 2; |
469 | goto resched; | |
470 | } | |
161a09e7 JL |
471 | |
472 | err = __xfrm_state_delete(x); | |
473 | if (!err && x->id.spi) | |
53bc6b4d | 474 | km_state_expired(x, 1, 0); |
1da177e4 | 475 | |
ab5f5e8b | 476 | xfrm_audit_state_delete(x, err ? 0 : 1, |
2532386f EP |
477 | audit_get_loginuid(current), |
478 | audit_get_sessionid(current), 0); | |
161a09e7 | 479 | |
1da177e4 LT |
480 | out: |
481 | spin_unlock(&x->lock); | |
9e0d57fd | 482 | return HRTIMER_NORESTART; |
1da177e4 LT |
483 | } |
484 | ||
0ac84752 DM |
485 | static void xfrm_replay_timer_handler(unsigned long data); |
486 | ||
673c09be | 487 | struct xfrm_state *xfrm_state_alloc(struct net *net) |
1da177e4 LT |
488 | { |
489 | struct xfrm_state *x; | |
490 | ||
0da974f4 | 491 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
492 | |
493 | if (x) { | |
673c09be | 494 | write_pnet(&x->xs_net, net); |
1da177e4 LT |
495 | atomic_set(&x->refcnt, 1); |
496 | atomic_set(&x->tunnel_users, 0); | |
12a169e7 | 497 | INIT_LIST_HEAD(&x->km.all); |
8f126e37 DM |
498 | INIT_HLIST_NODE(&x->bydst); |
499 | INIT_HLIST_NODE(&x->bysrc); | |
500 | INIT_HLIST_NODE(&x->byspi); | |
9e0d57fd | 501 | tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS); |
b24b8a24 PE |
502 | setup_timer(&x->rtimer, xfrm_replay_timer_handler, |
503 | (unsigned long)x); | |
9d729f72 | 504 | x->curlft.add_time = get_seconds(); |
1da177e4 LT |
505 | x->lft.soft_byte_limit = XFRM_INF; |
506 | x->lft.soft_packet_limit = XFRM_INF; | |
507 | x->lft.hard_byte_limit = XFRM_INF; | |
508 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
509 | x->replay_maxage = 0; |
510 | x->replay_maxdiff = 0; | |
df9dcb45 KM |
511 | x->inner_mode = NULL; |
512 | x->inner_mode_iaf = NULL; | |
1da177e4 LT |
513 | spin_lock_init(&x->lock); |
514 | } | |
515 | return x; | |
516 | } | |
517 | EXPORT_SYMBOL(xfrm_state_alloc); | |
518 | ||
519 | void __xfrm_state_destroy(struct xfrm_state *x) | |
520 | { | |
98806f75 AD |
521 | struct net *net = xs_net(x); |
522 | ||
547b792c | 523 | WARN_ON(x->km.state != XFRM_STATE_DEAD); |
1da177e4 LT |
524 | |
525 | spin_lock_bh(&xfrm_state_gc_lock); | |
98806f75 | 526 | hlist_add_head(&x->gclist, &net->xfrm.state_gc_list); |
1da177e4 | 527 | spin_unlock_bh(&xfrm_state_gc_lock); |
98806f75 | 528 | schedule_work(&net->xfrm.state_gc_work); |
1da177e4 LT |
529 | } |
530 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
531 | ||
53bc6b4d | 532 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 533 | { |
98806f75 | 534 | struct net *net = xs_net(x); |
26b15dad JHS |
535 | int err = -ESRCH; |
536 | ||
1da177e4 LT |
537 | if (x->km.state != XFRM_STATE_DEAD) { |
538 | x->km.state = XFRM_STATE_DEAD; | |
539 | spin_lock(&xfrm_state_lock); | |
12a169e7 | 540 | list_del(&x->km.all); |
8f126e37 | 541 | hlist_del(&x->bydst); |
8f126e37 | 542 | hlist_del(&x->bysrc); |
a47f0ce0 | 543 | if (x->id.spi) |
8f126e37 | 544 | hlist_del(&x->byspi); |
98806f75 | 545 | net->xfrm.state_num--; |
1da177e4 | 546 | spin_unlock(&xfrm_state_lock); |
1da177e4 | 547 | |
1da177e4 LT |
548 | /* All xfrm_state objects are created by xfrm_state_alloc. |
549 | * The xfrm_state_alloc call gives a reference, and that | |
550 | * is what we are dropping here. | |
551 | */ | |
5dba4797 | 552 | xfrm_state_put(x); |
26b15dad | 553 | err = 0; |
1da177e4 | 554 | } |
26b15dad JHS |
555 | |
556 | return err; | |
1da177e4 | 557 | } |
53bc6b4d | 558 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 559 | |
26b15dad | 560 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 561 | { |
26b15dad JHS |
562 | int err; |
563 | ||
1da177e4 | 564 | spin_lock_bh(&x->lock); |
26b15dad | 565 | err = __xfrm_state_delete(x); |
1da177e4 | 566 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
567 | |
568 | return err; | |
1da177e4 LT |
569 | } |
570 | EXPORT_SYMBOL(xfrm_state_delete); | |
571 | ||
4aa2e62c JL |
572 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
573 | static inline int | |
0e602451 | 574 | xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
1da177e4 | 575 | { |
4aa2e62c JL |
576 | int i, err = 0; |
577 | ||
0e602451 | 578 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
4aa2e62c JL |
579 | struct hlist_node *entry; |
580 | struct xfrm_state *x; | |
581 | ||
0e602451 | 582 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
4aa2e62c JL |
583 | if (xfrm_id_proto_match(x->id.proto, proto) && |
584 | (err = security_xfrm_state_delete(x)) != 0) { | |
ab5f5e8b JL |
585 | xfrm_audit_state_delete(x, 0, |
586 | audit_info->loginuid, | |
2532386f | 587 | audit_info->sessionid, |
ab5f5e8b | 588 | audit_info->secid); |
4aa2e62c JL |
589 | return err; |
590 | } | |
591 | } | |
592 | } | |
593 | ||
594 | return err; | |
595 | } | |
596 | #else | |
597 | static inline int | |
0e602451 | 598 | xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
4aa2e62c JL |
599 | { |
600 | return 0; | |
601 | } | |
602 | #endif | |
603 | ||
0e602451 | 604 | int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
4aa2e62c | 605 | { |
19f4c713 | 606 | int i, err = 0, cnt = 0; |
1da177e4 LT |
607 | |
608 | spin_lock_bh(&xfrm_state_lock); | |
0e602451 | 609 | err = xfrm_state_flush_secctx_check(net, proto, audit_info); |
4aa2e62c JL |
610 | if (err) |
611 | goto out; | |
612 | ||
19f4c713 | 613 | err = -ESRCH; |
0e602451 | 614 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
615 | struct hlist_node *entry; |
616 | struct xfrm_state *x; | |
1da177e4 | 617 | restart: |
0e602451 | 618 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
1da177e4 | 619 | if (!xfrm_state_kern(x) && |
5794708f | 620 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
621 | xfrm_state_hold(x); |
622 | spin_unlock_bh(&xfrm_state_lock); | |
623 | ||
161a09e7 | 624 | err = xfrm_state_delete(x); |
ab5f5e8b JL |
625 | xfrm_audit_state_delete(x, err ? 0 : 1, |
626 | audit_info->loginuid, | |
2532386f | 627 | audit_info->sessionid, |
ab5f5e8b | 628 | audit_info->secid); |
1da177e4 | 629 | xfrm_state_put(x); |
19f4c713 | 630 | if (!err) |
631 | cnt++; | |
1da177e4 LT |
632 | |
633 | spin_lock_bh(&xfrm_state_lock); | |
634 | goto restart; | |
635 | } | |
636 | } | |
637 | } | |
19f4c713 | 638 | if (cnt) |
639 | err = 0; | |
4aa2e62c JL |
640 | |
641 | out: | |
1da177e4 | 642 | spin_unlock_bh(&xfrm_state_lock); |
0e602451 | 643 | wake_up(&net->xfrm.km_waitq); |
4aa2e62c | 644 | return err; |
1da177e4 LT |
645 | } |
646 | EXPORT_SYMBOL(xfrm_state_flush); | |
647 | ||
e071041b | 648 | void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) |
28d8909b JHS |
649 | { |
650 | spin_lock_bh(&xfrm_state_lock); | |
e071041b AD |
651 | si->sadcnt = net->xfrm.state_num; |
652 | si->sadhcnt = net->xfrm.state_hmask; | |
28d8909b JHS |
653 | si->sadhmcnt = xfrm_state_hashmax; |
654 | spin_unlock_bh(&xfrm_state_lock); | |
655 | } | |
656 | EXPORT_SYMBOL(xfrm_sad_getinfo); | |
657 | ||
1da177e4 LT |
658 | static int |
659 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
660 | struct xfrm_tmpl *tmpl, | |
661 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
662 | unsigned short family) | |
663 | { | |
664 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
665 | if (!afinfo) | |
666 | return -1; | |
667 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
668 | xfrm_state_put_afinfo(afinfo); | |
669 | return 0; | |
670 | } | |
671 | ||
221df1ed | 672 | static struct xfrm_state *__xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
edcd5821 | 673 | { |
221df1ed | 674 | unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); |
edcd5821 | 675 | struct xfrm_state *x; |
8f126e37 | 676 | struct hlist_node *entry; |
edcd5821 | 677 | |
221df1ed | 678 | hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) { |
edcd5821 DM |
679 | if (x->props.family != family || |
680 | x->id.spi != spi || | |
1802571b WY |
681 | x->id.proto != proto || |
682 | xfrm_addr_cmp(&x->id.daddr, daddr, family)) | |
edcd5821 DM |
683 | continue; |
684 | ||
edcd5821 DM |
685 | xfrm_state_hold(x); |
686 | return x; | |
687 | } | |
688 | ||
689 | return NULL; | |
690 | } | |
691 | ||
221df1ed | 692 | static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family) |
edcd5821 | 693 | { |
221df1ed | 694 | unsigned int h = xfrm_src_hash(net, daddr, saddr, family); |
edcd5821 | 695 | struct xfrm_state *x; |
8f126e37 | 696 | struct hlist_node *entry; |
edcd5821 | 697 | |
221df1ed | 698 | hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) { |
edcd5821 | 699 | if (x->props.family != family || |
1802571b WY |
700 | x->id.proto != proto || |
701 | xfrm_addr_cmp(&x->id.daddr, daddr, family) || | |
702 | xfrm_addr_cmp(&x->props.saddr, saddr, family)) | |
edcd5821 DM |
703 | continue; |
704 | ||
edcd5821 DM |
705 | xfrm_state_hold(x); |
706 | return x; | |
707 | } | |
708 | ||
709 | return NULL; | |
710 | } | |
711 | ||
712 | static inline struct xfrm_state * | |
713 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
714 | { | |
221df1ed AD |
715 | struct net *net = xs_net(x); |
716 | ||
edcd5821 | 717 | if (use_spi) |
221df1ed | 718 | return __xfrm_state_lookup(net, &x->id.daddr, x->id.spi, |
edcd5821 DM |
719 | x->id.proto, family); |
720 | else | |
221df1ed | 721 | return __xfrm_state_lookup_byaddr(net, &x->id.daddr, |
edcd5821 DM |
722 | &x->props.saddr, |
723 | x->id.proto, family); | |
724 | } | |
725 | ||
98806f75 | 726 | static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) |
2fab22f2 PM |
727 | { |
728 | if (have_hash_collision && | |
98806f75 AD |
729 | (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && |
730 | net->xfrm.state_num > net->xfrm.state_hmask) | |
731 | schedule_work(&net->xfrm.state_hash_work); | |
2fab22f2 PM |
732 | } |
733 | ||
08ec9af1 DM |
734 | static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, |
735 | struct flowi *fl, unsigned short family, | |
736 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
737 | struct xfrm_state **best, int *acq_in_progress, | |
738 | int *error) | |
739 | { | |
740 | /* Resolution logic: | |
741 | * 1. There is a valid state with matching selector. Done. | |
742 | * 2. Valid state with inappropriate selector. Skip. | |
743 | * | |
744 | * Entering area of "sysdeps". | |
745 | * | |
746 | * 3. If state is not valid, selector is temporary, it selects | |
747 | * only session which triggered previous resolution. Key | |
748 | * manager will do something to install a state with proper | |
749 | * selector. | |
750 | */ | |
751 | if (x->km.state == XFRM_STATE_VALID) { | |
752 | if ((x->sel.family && | |
753 | !xfrm_selector_match(&x->sel, fl, x->sel.family)) || | |
754 | !security_xfrm_state_pol_flow_match(x, pol, fl)) | |
755 | return; | |
756 | ||
757 | if (!*best || | |
758 | (*best)->km.dying > x->km.dying || | |
759 | ((*best)->km.dying == x->km.dying && | |
760 | (*best)->curlft.add_time < x->curlft.add_time)) | |
761 | *best = x; | |
762 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
763 | *acq_in_progress = 1; | |
764 | } else if (x->km.state == XFRM_STATE_ERROR || | |
765 | x->km.state == XFRM_STATE_EXPIRED) { | |
766 | if (xfrm_selector_match(&x->sel, fl, x->sel.family) && | |
767 | security_xfrm_state_pol_flow_match(x, pol, fl)) | |
768 | *error = -ESRCH; | |
769 | } | |
770 | } | |
771 | ||
1da177e4 | 772 | struct xfrm_state * |
a716c119 | 773 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
774 | struct flowi *fl, struct xfrm_tmpl *tmpl, |
775 | struct xfrm_policy *pol, int *err, | |
776 | unsigned short family) | |
777 | { | |
08ec9af1 | 778 | static xfrm_address_t saddr_wildcard = { }; |
5447c5e4 | 779 | struct net *net = xp_net(pol); |
6a783c90 | 780 | unsigned int h, h_wildcard; |
8f126e37 | 781 | struct hlist_node *entry; |
37b08e34 | 782 | struct xfrm_state *x, *x0, *to_put; |
1da177e4 LT |
783 | int acquire_in_progress = 0; |
784 | int error = 0; | |
785 | struct xfrm_state *best = NULL; | |
a716c119 | 786 | |
37b08e34 DM |
787 | to_put = NULL; |
788 | ||
1da177e4 | 789 | spin_lock_bh(&xfrm_state_lock); |
5447c5e4 AD |
790 | h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, family); |
791 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
1da177e4 LT |
792 | if (x->props.family == family && |
793 | x->props.reqid == tmpl->reqid && | |
fbd9a5b4 | 794 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
1da177e4 LT |
795 | xfrm_state_addr_check(x, daddr, saddr, family) && |
796 | tmpl->mode == x->props.mode && | |
797 | tmpl->id.proto == x->id.proto && | |
08ec9af1 DM |
798 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) |
799 | xfrm_state_look_at(pol, x, fl, family, daddr, saddr, | |
800 | &best, &acquire_in_progress, &error); | |
801 | } | |
802 | if (best) | |
803 | goto found; | |
804 | ||
6a783c90 ND |
805 | h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, family); |
806 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) { | |
08ec9af1 DM |
807 | if (x->props.family == family && |
808 | x->props.reqid == tmpl->reqid && | |
809 | !(x->props.flags & XFRM_STATE_WILDRECV) && | |
810 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
811 | tmpl->mode == x->props.mode && | |
812 | tmpl->id.proto == x->id.proto && | |
813 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) | |
814 | xfrm_state_look_at(pol, x, fl, family, daddr, saddr, | |
815 | &best, &acquire_in_progress, &error); | |
1da177e4 LT |
816 | } |
817 | ||
08ec9af1 | 818 | found: |
1da177e4 LT |
819 | x = best; |
820 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 821 | if (tmpl->id.spi && |
5447c5e4 | 822 | (x0 = __xfrm_state_lookup(net, daddr, tmpl->id.spi, |
edcd5821 | 823 | tmpl->id.proto, family)) != NULL) { |
37b08e34 | 824 | to_put = x0; |
1da177e4 LT |
825 | error = -EEXIST; |
826 | goto out; | |
827 | } | |
5447c5e4 | 828 | x = xfrm_state_alloc(net); |
1da177e4 LT |
829 | if (x == NULL) { |
830 | error = -ENOMEM; | |
831 | goto out; | |
832 | } | |
833 | /* Initialize temporary selector matching only | |
834 | * to current session. */ | |
835 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
836 | ||
e0d1caa7 VY |
837 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
838 | if (error) { | |
839 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 840 | to_put = x; |
e0d1caa7 VY |
841 | x = NULL; |
842 | goto out; | |
843 | } | |
844 | ||
1da177e4 LT |
845 | if (km_query(x, tmpl, pol) == 0) { |
846 | x->km.state = XFRM_STATE_ACQ; | |
5447c5e4 AD |
847 | list_add(&x->km.all, &net->xfrm.state_all); |
848 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
849 | h = xfrm_src_hash(net, daddr, saddr, family); | |
850 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
1da177e4 | 851 | if (x->id.spi) { |
5447c5e4 AD |
852 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, family); |
853 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 854 | } |
b27aeadb | 855 | x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
9e0d57fd | 856 | tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); |
5447c5e4 AD |
857 | net->xfrm.state_num++; |
858 | xfrm_hash_grow_check(net, x->bydst.next != NULL); | |
1da177e4 LT |
859 | } else { |
860 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 861 | to_put = x; |
1da177e4 LT |
862 | x = NULL; |
863 | error = -ESRCH; | |
864 | } | |
865 | } | |
866 | out: | |
867 | if (x) | |
868 | xfrm_state_hold(x); | |
869 | else | |
870 | *err = acquire_in_progress ? -EAGAIN : error; | |
871 | spin_unlock_bh(&xfrm_state_lock); | |
37b08e34 DM |
872 | if (to_put) |
873 | xfrm_state_put(to_put); | |
1da177e4 LT |
874 | return x; |
875 | } | |
876 | ||
628529b6 | 877 | struct xfrm_state * |
5447c5e4 AD |
878 | xfrm_stateonly_find(struct net *net, |
879 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
628529b6 JHS |
880 | unsigned short family, u8 mode, u8 proto, u32 reqid) |
881 | { | |
4bda4f25 | 882 | unsigned int h; |
628529b6 JHS |
883 | struct xfrm_state *rx = NULL, *x = NULL; |
884 | struct hlist_node *entry; | |
885 | ||
886 | spin_lock(&xfrm_state_lock); | |
5447c5e4 AD |
887 | h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
888 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
628529b6 JHS |
889 | if (x->props.family == family && |
890 | x->props.reqid == reqid && | |
891 | !(x->props.flags & XFRM_STATE_WILDRECV) && | |
892 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
893 | mode == x->props.mode && | |
894 | proto == x->id.proto && | |
895 | x->km.state == XFRM_STATE_VALID) { | |
896 | rx = x; | |
897 | break; | |
898 | } | |
899 | } | |
900 | ||
901 | if (rx) | |
902 | xfrm_state_hold(rx); | |
903 | spin_unlock(&xfrm_state_lock); | |
904 | ||
905 | ||
906 | return rx; | |
907 | } | |
908 | EXPORT_SYMBOL(xfrm_stateonly_find); | |
909 | ||
1da177e4 LT |
910 | static void __xfrm_state_insert(struct xfrm_state *x) |
911 | { | |
98806f75 | 912 | struct net *net = xs_net(x); |
a624c108 | 913 | unsigned int h; |
1da177e4 | 914 | |
9d4a706d DM |
915 | x->genid = ++xfrm_state_genid; |
916 | ||
98806f75 | 917 | list_add(&x->km.all, &net->xfrm.state_all); |
4c563f76 | 918 | |
98806f75 | 919 | h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, |
c1969f29 | 920 | x->props.reqid, x->props.family); |
98806f75 | 921 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); |
1da177e4 | 922 | |
98806f75 AD |
923 | h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); |
924 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
1da177e4 | 925 | |
7b4dc360 | 926 | if (x->id.spi) { |
98806f75 | 927 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, |
6c44e6b7 MN |
928 | x->props.family); |
929 | ||
98806f75 | 930 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); |
6c44e6b7 MN |
931 | } |
932 | ||
9e0d57fd | 933 | tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); |
a47f0ce0 DM |
934 | if (x->replay_maxage) |
935 | mod_timer(&x->rtimer, jiffies + x->replay_maxage); | |
f8cd5488 | 936 | |
98806f75 | 937 | wake_up(&net->xfrm.km_waitq); |
f034b5d4 | 938 | |
98806f75 | 939 | net->xfrm.state_num++; |
f034b5d4 | 940 | |
98806f75 | 941 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
1da177e4 LT |
942 | } |
943 | ||
c7f5ea3a DM |
944 | /* xfrm_state_lock is held */ |
945 | static void __xfrm_state_bump_genids(struct xfrm_state *xnew) | |
946 | { | |
98806f75 | 947 | struct net *net = xs_net(xnew); |
c7f5ea3a DM |
948 | unsigned short family = xnew->props.family; |
949 | u32 reqid = xnew->props.reqid; | |
950 | struct xfrm_state *x; | |
951 | struct hlist_node *entry; | |
952 | unsigned int h; | |
953 | ||
98806f75 AD |
954 | h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); |
955 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
c7f5ea3a DM |
956 | if (x->props.family == family && |
957 | x->props.reqid == reqid && | |
c1969f29 DM |
958 | !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && |
959 | !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) | |
c7f5ea3a DM |
960 | x->genid = xfrm_state_genid; |
961 | } | |
962 | } | |
963 | ||
1da177e4 LT |
964 | void xfrm_state_insert(struct xfrm_state *x) |
965 | { | |
966 | spin_lock_bh(&xfrm_state_lock); | |
c7f5ea3a | 967 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
968 | __xfrm_state_insert(x); |
969 | spin_unlock_bh(&xfrm_state_lock); | |
970 | } | |
971 | EXPORT_SYMBOL(xfrm_state_insert); | |
972 | ||
2770834c | 973 | /* xfrm_state_lock is held */ |
5447c5e4 | 974 | static struct xfrm_state *__find_acq_core(struct net *net, unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create) |
2770834c | 975 | { |
5447c5e4 | 976 | unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
8f126e37 | 977 | struct hlist_node *entry; |
2770834c DM |
978 | struct xfrm_state *x; |
979 | ||
5447c5e4 | 980 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { |
2770834c DM |
981 | if (x->props.reqid != reqid || |
982 | x->props.mode != mode || | |
983 | x->props.family != family || | |
984 | x->km.state != XFRM_STATE_ACQ || | |
75e252d9 | 985 | x->id.spi != 0 || |
1802571b WY |
986 | x->id.proto != proto || |
987 | xfrm_addr_cmp(&x->id.daddr, daddr, family) || | |
988 | xfrm_addr_cmp(&x->props.saddr, saddr, family)) | |
2770834c DM |
989 | continue; |
990 | ||
2770834c DM |
991 | xfrm_state_hold(x); |
992 | return x; | |
993 | } | |
994 | ||
995 | if (!create) | |
996 | return NULL; | |
997 | ||
5447c5e4 | 998 | x = xfrm_state_alloc(net); |
2770834c DM |
999 | if (likely(x)) { |
1000 | switch (family) { | |
1001 | case AF_INET: | |
1002 | x->sel.daddr.a4 = daddr->a4; | |
1003 | x->sel.saddr.a4 = saddr->a4; | |
1004 | x->sel.prefixlen_d = 32; | |
1005 | x->sel.prefixlen_s = 32; | |
1006 | x->props.saddr.a4 = saddr->a4; | |
1007 | x->id.daddr.a4 = daddr->a4; | |
1008 | break; | |
1009 | ||
1010 | case AF_INET6: | |
1011 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
1012 | (struct in6_addr *)daddr); | |
1013 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
1014 | (struct in6_addr *)saddr); | |
1015 | x->sel.prefixlen_d = 128; | |
1016 | x->sel.prefixlen_s = 128; | |
1017 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
1018 | (struct in6_addr *)saddr); | |
1019 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
1020 | (struct in6_addr *)daddr); | |
1021 | break; | |
3ff50b79 | 1022 | } |
2770834c DM |
1023 | |
1024 | x->km.state = XFRM_STATE_ACQ; | |
1025 | x->id.proto = proto; | |
1026 | x->props.family = family; | |
1027 | x->props.mode = mode; | |
1028 | x->props.reqid = reqid; | |
b27aeadb | 1029 | x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
2770834c | 1030 | xfrm_state_hold(x); |
9e0d57fd | 1031 | tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); |
5447c5e4 AD |
1032 | list_add(&x->km.all, &net->xfrm.state_all); |
1033 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
1034 | h = xfrm_src_hash(net, daddr, saddr, family); | |
1035 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
918049f0 | 1036 | |
5447c5e4 | 1037 | net->xfrm.state_num++; |
918049f0 | 1038 | |
5447c5e4 | 1039 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
2770834c DM |
1040 | } |
1041 | ||
1042 | return x; | |
1043 | } | |
1044 | ||
5447c5e4 | 1045 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq); |
1da177e4 LT |
1046 | |
1047 | int xfrm_state_add(struct xfrm_state *x) | |
1048 | { | |
5447c5e4 | 1049 | struct net *net = xs_net(x); |
37b08e34 | 1050 | struct xfrm_state *x1, *to_put; |
1da177e4 LT |
1051 | int family; |
1052 | int err; | |
eb2971b6 | 1053 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
1054 | |
1055 | family = x->props.family; | |
1da177e4 | 1056 | |
37b08e34 DM |
1057 | to_put = NULL; |
1058 | ||
1da177e4 LT |
1059 | spin_lock_bh(&xfrm_state_lock); |
1060 | ||
edcd5821 | 1061 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 | 1062 | if (x1) { |
37b08e34 | 1063 | to_put = x1; |
1da177e4 LT |
1064 | x1 = NULL; |
1065 | err = -EEXIST; | |
1066 | goto out; | |
1067 | } | |
1068 | ||
eb2971b6 | 1069 | if (use_spi && x->km.seq) { |
5447c5e4 | 1070 | x1 = __xfrm_find_acq_byseq(net, x->km.seq); |
75e252d9 JL |
1071 | if (x1 && ((x1->id.proto != x->id.proto) || |
1072 | xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) { | |
37b08e34 | 1073 | to_put = x1; |
1da177e4 LT |
1074 | x1 = NULL; |
1075 | } | |
1076 | } | |
1077 | ||
eb2971b6 | 1078 | if (use_spi && !x1) |
5447c5e4 | 1079 | x1 = __find_acq_core(net, family, x->props.mode, x->props.reqid, |
2770834c DM |
1080 | x->id.proto, |
1081 | &x->id.daddr, &x->props.saddr, 0); | |
1da177e4 | 1082 | |
c7f5ea3a | 1083 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
1084 | __xfrm_state_insert(x); |
1085 | err = 0; | |
1086 | ||
1087 | out: | |
1088 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
1089 | |
1090 | if (x1) { | |
1091 | xfrm_state_delete(x1); | |
1092 | xfrm_state_put(x1); | |
1093 | } | |
1094 | ||
37b08e34 DM |
1095 | if (to_put) |
1096 | xfrm_state_put(to_put); | |
1097 | ||
1da177e4 LT |
1098 | return err; |
1099 | } | |
1100 | EXPORT_SYMBOL(xfrm_state_add); | |
1101 | ||
80c9abaa | 1102 | #ifdef CONFIG_XFRM_MIGRATE |
6666351d | 1103 | static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) |
80c9abaa | 1104 | { |
98806f75 | 1105 | struct net *net = xs_net(orig); |
80c9abaa | 1106 | int err = -ENOMEM; |
98806f75 | 1107 | struct xfrm_state *x = xfrm_state_alloc(net); |
80c9abaa | 1108 | if (!x) |
553f9118 | 1109 | goto out; |
80c9abaa SS |
1110 | |
1111 | memcpy(&x->id, &orig->id, sizeof(x->id)); | |
1112 | memcpy(&x->sel, &orig->sel, sizeof(x->sel)); | |
1113 | memcpy(&x->lft, &orig->lft, sizeof(x->lft)); | |
1114 | x->props.mode = orig->props.mode; | |
1115 | x->props.replay_window = orig->props.replay_window; | |
1116 | x->props.reqid = orig->props.reqid; | |
1117 | x->props.family = orig->props.family; | |
1118 | x->props.saddr = orig->props.saddr; | |
1119 | ||
1120 | if (orig->aalg) { | |
4447bb33 | 1121 | x->aalg = xfrm_algo_auth_clone(orig->aalg); |
80c9abaa SS |
1122 | if (!x->aalg) |
1123 | goto error; | |
1124 | } | |
1125 | x->props.aalgo = orig->props.aalgo; | |
1126 | ||
1127 | if (orig->ealg) { | |
1128 | x->ealg = xfrm_algo_clone(orig->ealg); | |
1129 | if (!x->ealg) | |
1130 | goto error; | |
1131 | } | |
1132 | x->props.ealgo = orig->props.ealgo; | |
1133 | ||
1134 | if (orig->calg) { | |
1135 | x->calg = xfrm_algo_clone(orig->calg); | |
1136 | if (!x->calg) | |
1137 | goto error; | |
1138 | } | |
1139 | x->props.calgo = orig->props.calgo; | |
1140 | ||
a716c119 | 1141 | if (orig->encap) { |
80c9abaa SS |
1142 | x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); |
1143 | if (!x->encap) | |
1144 | goto error; | |
1145 | } | |
1146 | ||
1147 | if (orig->coaddr) { | |
1148 | x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), | |
1149 | GFP_KERNEL); | |
1150 | if (!x->coaddr) | |
1151 | goto error; | |
1152 | } | |
1153 | ||
1154 | err = xfrm_init_state(x); | |
1155 | if (err) | |
1156 | goto error; | |
1157 | ||
1158 | x->props.flags = orig->props.flags; | |
1159 | ||
1160 | x->curlft.add_time = orig->curlft.add_time; | |
1161 | x->km.state = orig->km.state; | |
1162 | x->km.seq = orig->km.seq; | |
1163 | ||
1164 | return x; | |
1165 | ||
1166 | error: | |
553f9118 HX |
1167 | xfrm_state_put(x); |
1168 | out: | |
80c9abaa SS |
1169 | if (errp) |
1170 | *errp = err; | |
80c9abaa SS |
1171 | return NULL; |
1172 | } | |
80c9abaa SS |
1173 | |
1174 | /* xfrm_state_lock is held */ | |
1175 | struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) | |
1176 | { | |
1177 | unsigned int h; | |
1178 | struct xfrm_state *x; | |
1179 | struct hlist_node *entry; | |
1180 | ||
1181 | if (m->reqid) { | |
64d0cd00 | 1182 | h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1183 | m->reqid, m->old_family); |
73d189dc | 1184 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { |
80c9abaa SS |
1185 | if (x->props.mode != m->mode || |
1186 | x->id.proto != m->proto) | |
1187 | continue; | |
1188 | if (m->reqid && x->props.reqid != m->reqid) | |
1189 | continue; | |
1190 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1191 | m->old_family) || | |
1192 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1193 | m->old_family)) | |
1194 | continue; | |
1195 | xfrm_state_hold(x); | |
1196 | return x; | |
1197 | } | |
1198 | } else { | |
64d0cd00 | 1199 | h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1200 | m->old_family); |
d320bbb3 | 1201 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) { |
80c9abaa SS |
1202 | if (x->props.mode != m->mode || |
1203 | x->id.proto != m->proto) | |
1204 | continue; | |
1205 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1206 | m->old_family) || | |
1207 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1208 | m->old_family)) | |
1209 | continue; | |
1210 | xfrm_state_hold(x); | |
1211 | return x; | |
1212 | } | |
1213 | } | |
1214 | ||
a716c119 | 1215 | return NULL; |
80c9abaa SS |
1216 | } |
1217 | EXPORT_SYMBOL(xfrm_migrate_state_find); | |
1218 | ||
1219 | struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, | |
1220 | struct xfrm_migrate *m) | |
1221 | { | |
1222 | struct xfrm_state *xc; | |
1223 | int err; | |
1224 | ||
1225 | xc = xfrm_state_clone(x, &err); | |
1226 | if (!xc) | |
1227 | return NULL; | |
1228 | ||
1229 | memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); | |
1230 | memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); | |
1231 | ||
1232 | /* add state */ | |
1233 | if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) { | |
1234 | /* a care is needed when the destination address of the | |
1235 | state is to be updated as it is a part of triplet */ | |
1236 | xfrm_state_insert(xc); | |
1237 | } else { | |
1238 | if ((err = xfrm_state_add(xc)) < 0) | |
1239 | goto error; | |
1240 | } | |
1241 | ||
1242 | return xc; | |
1243 | error: | |
1244 | kfree(xc); | |
1245 | return NULL; | |
1246 | } | |
1247 | EXPORT_SYMBOL(xfrm_state_migrate); | |
1248 | #endif | |
1249 | ||
1da177e4 LT |
1250 | int xfrm_state_update(struct xfrm_state *x) |
1251 | { | |
37b08e34 | 1252 | struct xfrm_state *x1, *to_put; |
1da177e4 | 1253 | int err; |
eb2971b6 | 1254 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 1255 | |
37b08e34 DM |
1256 | to_put = NULL; |
1257 | ||
1da177e4 | 1258 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 1259 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
1260 | |
1261 | err = -ESRCH; | |
1262 | if (!x1) | |
1263 | goto out; | |
1264 | ||
1265 | if (xfrm_state_kern(x1)) { | |
37b08e34 | 1266 | to_put = x1; |
1da177e4 LT |
1267 | err = -EEXIST; |
1268 | goto out; | |
1269 | } | |
1270 | ||
1271 | if (x1->km.state == XFRM_STATE_ACQ) { | |
1272 | __xfrm_state_insert(x); | |
1273 | x = NULL; | |
1274 | } | |
1275 | err = 0; | |
1276 | ||
1277 | out: | |
1278 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 | 1279 | |
37b08e34 DM |
1280 | if (to_put) |
1281 | xfrm_state_put(to_put); | |
1282 | ||
1da177e4 LT |
1283 | if (err) |
1284 | return err; | |
1285 | ||
1286 | if (!x) { | |
1287 | xfrm_state_delete(x1); | |
1288 | xfrm_state_put(x1); | |
1289 | return 0; | |
1290 | } | |
1291 | ||
1292 | err = -EINVAL; | |
1293 | spin_lock_bh(&x1->lock); | |
1294 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
1295 | if (x->encap && x1->encap) | |
1296 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
1297 | if (x->coaddr && x1->coaddr) { |
1298 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
1299 | } | |
1300 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
1301 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
1302 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
1303 | x1->km.dying = 0; | |
1304 | ||
9e0d57fd | 1305 | tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); |
1da177e4 LT |
1306 | if (x1->curlft.use_time) |
1307 | xfrm_state_check_expire(x1); | |
1308 | ||
1309 | err = 0; | |
1310 | } | |
1311 | spin_unlock_bh(&x1->lock); | |
1312 | ||
1313 | xfrm_state_put(x1); | |
1314 | ||
1315 | return err; | |
1316 | } | |
1317 | EXPORT_SYMBOL(xfrm_state_update); | |
1318 | ||
1319 | int xfrm_state_check_expire(struct xfrm_state *x) | |
1320 | { | |
1321 | if (!x->curlft.use_time) | |
9d729f72 | 1322 | x->curlft.use_time = get_seconds(); |
1da177e4 LT |
1323 | |
1324 | if (x->km.state != XFRM_STATE_VALID) | |
1325 | return -EINVAL; | |
1326 | ||
1327 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
1328 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 1329 | x->km.state = XFRM_STATE_EXPIRED; |
9e0d57fd | 1330 | tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL); |
1da177e4 LT |
1331 | return -EINVAL; |
1332 | } | |
1333 | ||
1334 | if (!x->km.dying && | |
1335 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
1336 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
1337 | x->km.dying = 1; | |
53bc6b4d | 1338 | km_state_expired(x, 0, 0); |
4666faab | 1339 | } |
1da177e4 LT |
1340 | return 0; |
1341 | } | |
1342 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
1343 | ||
1da177e4 | 1344 | struct xfrm_state * |
221df1ed | 1345 | xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, |
1da177e4 LT |
1346 | unsigned short family) |
1347 | { | |
1348 | struct xfrm_state *x; | |
1da177e4 LT |
1349 | |
1350 | spin_lock_bh(&xfrm_state_lock); | |
221df1ed | 1351 | x = __xfrm_state_lookup(net, daddr, spi, proto, family); |
1da177e4 | 1352 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
1353 | return x; |
1354 | } | |
1355 | EXPORT_SYMBOL(xfrm_state_lookup); | |
1356 | ||
1357 | struct xfrm_state * | |
221df1ed AD |
1358 | xfrm_state_lookup_byaddr(struct net *net, |
1359 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
eb2971b6 MN |
1360 | u8 proto, unsigned short family) |
1361 | { | |
1362 | struct xfrm_state *x; | |
eb2971b6 MN |
1363 | |
1364 | spin_lock_bh(&xfrm_state_lock); | |
221df1ed | 1365 | x = __xfrm_state_lookup_byaddr(net, daddr, saddr, proto, family); |
eb2971b6 | 1366 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
1367 | return x; |
1368 | } | |
1369 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
1370 | ||
1371 | struct xfrm_state * | |
5447c5e4 | 1372 | xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto, |
a716c119 | 1373 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
1374 | int create, unsigned short family) |
1375 | { | |
1376 | struct xfrm_state *x; | |
1da177e4 LT |
1377 | |
1378 | spin_lock_bh(&xfrm_state_lock); | |
5447c5e4 | 1379 | x = __find_acq_core(net, family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 1380 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 1381 | |
1da177e4 LT |
1382 | return x; |
1383 | } | |
1384 | EXPORT_SYMBOL(xfrm_find_acq); | |
1385 | ||
41a49cc3 MN |
1386 | #ifdef CONFIG_XFRM_SUB_POLICY |
1387 | int | |
1388 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
1389 | unsigned short family) | |
1390 | { | |
1391 | int err = 0; | |
1392 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1393 | if (!afinfo) | |
1394 | return -EAFNOSUPPORT; | |
1395 | ||
1396 | spin_lock_bh(&xfrm_state_lock); | |
1397 | if (afinfo->tmpl_sort) | |
1398 | err = afinfo->tmpl_sort(dst, src, n); | |
1399 | spin_unlock_bh(&xfrm_state_lock); | |
1400 | xfrm_state_put_afinfo(afinfo); | |
1401 | return err; | |
1402 | } | |
1403 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
1404 | ||
1405 | int | |
1406 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
1407 | unsigned short family) | |
1408 | { | |
1409 | int err = 0; | |
1410 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1411 | if (!afinfo) | |
1412 | return -EAFNOSUPPORT; | |
1413 | ||
1414 | spin_lock_bh(&xfrm_state_lock); | |
1415 | if (afinfo->state_sort) | |
1416 | err = afinfo->state_sort(dst, src, n); | |
1417 | spin_unlock_bh(&xfrm_state_lock); | |
1418 | xfrm_state_put_afinfo(afinfo); | |
1419 | return err; | |
1420 | } | |
1421 | EXPORT_SYMBOL(xfrm_state_sort); | |
1422 | #endif | |
1423 | ||
1da177e4 LT |
1424 | /* Silly enough, but I'm lazy to build resolution list */ |
1425 | ||
5447c5e4 | 1426 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq) |
1da177e4 LT |
1427 | { |
1428 | int i; | |
1da177e4 | 1429 | |
5447c5e4 | 1430 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
1431 | struct hlist_node *entry; |
1432 | struct xfrm_state *x; | |
1433 | ||
5447c5e4 | 1434 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
8f126e37 DM |
1435 | if (x->km.seq == seq && |
1436 | x->km.state == XFRM_STATE_ACQ) { | |
1da177e4 LT |
1437 | xfrm_state_hold(x); |
1438 | return x; | |
1439 | } | |
1440 | } | |
1441 | } | |
1442 | return NULL; | |
1443 | } | |
1444 | ||
5447c5e4 | 1445 | struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq) |
1da177e4 LT |
1446 | { |
1447 | struct xfrm_state *x; | |
1448 | ||
1449 | spin_lock_bh(&xfrm_state_lock); | |
5447c5e4 | 1450 | x = __xfrm_find_acq_byseq(net, seq); |
1da177e4 LT |
1451 | spin_unlock_bh(&xfrm_state_lock); |
1452 | return x; | |
1453 | } | |
1454 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1455 | ||
1456 | u32 xfrm_get_acqseq(void) | |
1457 | { | |
1458 | u32 res; | |
6836b9bd | 1459 | static atomic_t acqseq; |
1460 | ||
1461 | do { | |
1462 | res = atomic_inc_return(&acqseq); | |
1463 | } while (!res); | |
1da177e4 | 1464 | |
1da177e4 LT |
1465 | return res; |
1466 | } | |
1467 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1468 | ||
658b219e | 1469 | int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) |
1da177e4 | 1470 | { |
221df1ed | 1471 | struct net *net = xs_net(x); |
f034b5d4 | 1472 | unsigned int h; |
1da177e4 | 1473 | struct xfrm_state *x0; |
658b219e HX |
1474 | int err = -ENOENT; |
1475 | __be32 minspi = htonl(low); | |
1476 | __be32 maxspi = htonl(high); | |
1da177e4 | 1477 | |
658b219e HX |
1478 | spin_lock_bh(&x->lock); |
1479 | if (x->km.state == XFRM_STATE_DEAD) | |
1480 | goto unlock; | |
1481 | ||
1482 | err = 0; | |
1da177e4 | 1483 | if (x->id.spi) |
658b219e HX |
1484 | goto unlock; |
1485 | ||
1486 | err = -ENOENT; | |
1da177e4 LT |
1487 | |
1488 | if (minspi == maxspi) { | |
221df1ed | 1489 | x0 = xfrm_state_lookup(net, &x->id.daddr, minspi, x->id.proto, x->props.family); |
1da177e4 LT |
1490 | if (x0) { |
1491 | xfrm_state_put(x0); | |
658b219e | 1492 | goto unlock; |
1da177e4 LT |
1493 | } |
1494 | x->id.spi = minspi; | |
1495 | } else { | |
1496 | u32 spi = 0; | |
26977b4e AV |
1497 | for (h=0; h<high-low+1; h++) { |
1498 | spi = low + net_random()%(high-low+1); | |
221df1ed | 1499 | x0 = xfrm_state_lookup(net, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
1da177e4 LT |
1500 | if (x0 == NULL) { |
1501 | x->id.spi = htonl(spi); | |
1502 | break; | |
1503 | } | |
1504 | xfrm_state_put(x0); | |
1505 | } | |
1506 | } | |
1507 | if (x->id.spi) { | |
1508 | spin_lock_bh(&xfrm_state_lock); | |
12604d8a AD |
1509 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); |
1510 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 1511 | spin_unlock_bh(&xfrm_state_lock); |
658b219e HX |
1512 | |
1513 | err = 0; | |
1da177e4 | 1514 | } |
658b219e HX |
1515 | |
1516 | unlock: | |
1517 | spin_unlock_bh(&x->lock); | |
1518 | ||
1519 | return err; | |
1da177e4 LT |
1520 | } |
1521 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1522 | ||
284fa7da | 1523 | int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, |
4c563f76 | 1524 | int (*func)(struct xfrm_state *, int, void*), |
1da177e4 LT |
1525 | void *data) |
1526 | { | |
12a169e7 HX |
1527 | struct xfrm_state *state; |
1528 | struct xfrm_state_walk *x; | |
1da177e4 LT |
1529 | int err = 0; |
1530 | ||
12a169e7 | 1531 | if (walk->seq != 0 && list_empty(&walk->all)) |
4c563f76 TT |
1532 | return 0; |
1533 | ||
1da177e4 | 1534 | spin_lock_bh(&xfrm_state_lock); |
12a169e7 | 1535 | if (list_empty(&walk->all)) |
284fa7da | 1536 | x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); |
12a169e7 HX |
1537 | else |
1538 | x = list_entry(&walk->all, struct xfrm_state_walk, all); | |
284fa7da | 1539 | list_for_each_entry_from(x, &net->xfrm.state_all, all) { |
12a169e7 | 1540 | if (x->state == XFRM_STATE_DEAD) |
4c563f76 | 1541 | continue; |
12a169e7 HX |
1542 | state = container_of(x, struct xfrm_state, km); |
1543 | if (!xfrm_id_proto_match(state->id.proto, walk->proto)) | |
4c563f76 | 1544 | continue; |
12a169e7 HX |
1545 | err = func(state, walk->seq, data); |
1546 | if (err) { | |
1547 | list_move_tail(&walk->all, &x->all); | |
1548 | goto out; | |
1da177e4 | 1549 | } |
12a169e7 | 1550 | walk->seq++; |
1da177e4 | 1551 | } |
12a169e7 | 1552 | if (walk->seq == 0) { |
1da177e4 LT |
1553 | err = -ENOENT; |
1554 | goto out; | |
1555 | } | |
12a169e7 | 1556 | list_del_init(&walk->all); |
1da177e4 LT |
1557 | out: |
1558 | spin_unlock_bh(&xfrm_state_lock); | |
1559 | return err; | |
1560 | } | |
1561 | EXPORT_SYMBOL(xfrm_state_walk); | |
1562 | ||
5c182458 HX |
1563 | void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) |
1564 | { | |
12a169e7 | 1565 | INIT_LIST_HEAD(&walk->all); |
5c182458 | 1566 | walk->proto = proto; |
12a169e7 HX |
1567 | walk->state = XFRM_STATE_DEAD; |
1568 | walk->seq = 0; | |
5c182458 HX |
1569 | } |
1570 | EXPORT_SYMBOL(xfrm_state_walk_init); | |
1571 | ||
abb81c4f HX |
1572 | void xfrm_state_walk_done(struct xfrm_state_walk *walk) |
1573 | { | |
12a169e7 | 1574 | if (list_empty(&walk->all)) |
5c182458 | 1575 | return; |
5c182458 | 1576 | |
12a169e7 HX |
1577 | spin_lock_bh(&xfrm_state_lock); |
1578 | list_del(&walk->all); | |
7d0b591c | 1579 | spin_unlock_bh(&xfrm_state_lock); |
abb81c4f HX |
1580 | } |
1581 | EXPORT_SYMBOL(xfrm_state_walk_done); | |
1582 | ||
f8cd5488 JHS |
1583 | |
1584 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
1585 | { | |
1586 | struct km_event c; | |
1587 | /* we send notify messages in case | |
1588 | * 1. we updated on of the sequence numbers, and the seqno difference | |
1589 | * is at least x->replay_maxdiff, in this case we also update the | |
1590 | * timeout of our timer function | |
1591 | * 2. if x->replay_maxage has elapsed since last update, | |
1592 | * and there were changes | |
1593 | * | |
1594 | * The state structure must be locked! | |
1595 | */ | |
1596 | ||
1597 | switch (event) { | |
1598 | case XFRM_REPLAY_UPDATE: | |
1599 | if (x->replay_maxdiff && | |
1600 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
1601 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
1602 | if (x->xflags & XFRM_TIME_DEFER) | |
1603 | event = XFRM_REPLAY_TIMEOUT; | |
1604 | else | |
1605 | return; | |
1606 | } | |
f8cd5488 JHS |
1607 | |
1608 | break; | |
1609 | ||
1610 | case XFRM_REPLAY_TIMEOUT: | |
1611 | if ((x->replay.seq == x->preplay.seq) && | |
1612 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1613 | (x->replay.oseq == x->preplay.oseq)) { |
1614 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1615 | return; |
2717096a | 1616 | } |
f8cd5488 JHS |
1617 | |
1618 | break; | |
1619 | } | |
1620 | ||
1621 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1622 | c.event = XFRM_MSG_NEWAE; | |
1623 | c.data.aevent = event; | |
1624 | km_state_notify(x, &c); | |
1625 | ||
f8cd5488 | 1626 | if (x->replay_maxage && |
a47f0ce0 | 1627 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
2717096a | 1628 | x->xflags &= ~XFRM_TIME_DEFER; |
f8cd5488 JHS |
1629 | } |
1630 | ||
1631 | static void xfrm_replay_timer_handler(unsigned long data) | |
1632 | { | |
1633 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1634 | ||
1635 | spin_lock(&x->lock); | |
1636 | ||
2717096a | 1637 | if (x->km.state == XFRM_STATE_VALID) { |
a6483b79 | 1638 | if (xfrm_aevent_is_on(xs_net(x))) |
2717096a JHS |
1639 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); |
1640 | else | |
1641 | x->xflags |= XFRM_TIME_DEFER; | |
1642 | } | |
f8cd5488 JHS |
1643 | |
1644 | spin_unlock(&x->lock); | |
1645 | } | |
1646 | ||
afeb14b4 PM |
1647 | int xfrm_replay_check(struct xfrm_state *x, |
1648 | struct sk_buff *skb, __be32 net_seq) | |
1da177e4 LT |
1649 | { |
1650 | u32 diff; | |
a252cc23 | 1651 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1652 | |
1653 | if (unlikely(seq == 0)) | |
afeb14b4 | 1654 | goto err; |
1da177e4 LT |
1655 | |
1656 | if (likely(seq > x->replay.seq)) | |
1657 | return 0; | |
1658 | ||
1659 | diff = x->replay.seq - seq; | |
4c4d51a7 HX |
1660 | if (diff >= min_t(unsigned int, x->props.replay_window, |
1661 | sizeof(x->replay.bitmap) * 8)) { | |
1da177e4 | 1662 | x->stats.replay_window++; |
afeb14b4 | 1663 | goto err; |
1da177e4 LT |
1664 | } |
1665 | ||
1666 | if (x->replay.bitmap & (1U << diff)) { | |
1667 | x->stats.replay++; | |
afeb14b4 | 1668 | goto err; |
1da177e4 LT |
1669 | } |
1670 | return 0; | |
afeb14b4 PM |
1671 | |
1672 | err: | |
1673 | xfrm_audit_state_replay(x, skb, net_seq); | |
1674 | return -EINVAL; | |
1da177e4 | 1675 | } |
1da177e4 | 1676 | |
61f4627b | 1677 | void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq) |
1da177e4 LT |
1678 | { |
1679 | u32 diff; | |
61f4627b | 1680 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1681 | |
1682 | if (seq > x->replay.seq) { | |
1683 | diff = seq - x->replay.seq; | |
1684 | if (diff < x->props.replay_window) | |
1685 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1686 | else | |
1687 | x->replay.bitmap = 1; | |
1688 | x->replay.seq = seq; | |
1689 | } else { | |
1690 | diff = x->replay.seq - seq; | |
1691 | x->replay.bitmap |= (1U << diff); | |
1692 | } | |
f8cd5488 | 1693 | |
a6483b79 | 1694 | if (xfrm_aevent_is_on(xs_net(x))) |
f8cd5488 | 1695 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); |
1da177e4 | 1696 | } |
1da177e4 | 1697 | |
df01812e | 1698 | static LIST_HEAD(xfrm_km_list); |
1da177e4 LT |
1699 | static DEFINE_RWLOCK(xfrm_km_lock); |
1700 | ||
26b15dad | 1701 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1702 | { |
1703 | struct xfrm_mgr *km; | |
1704 | ||
26b15dad JHS |
1705 | read_lock(&xfrm_km_lock); |
1706 | list_for_each_entry(km, &xfrm_km_list, list) | |
1707 | if (km->notify_policy) | |
1708 | km->notify_policy(xp, dir, c); | |
1709 | read_unlock(&xfrm_km_lock); | |
1710 | } | |
1da177e4 | 1711 | |
26b15dad JHS |
1712 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
1713 | { | |
1714 | struct xfrm_mgr *km; | |
1da177e4 LT |
1715 | read_lock(&xfrm_km_lock); |
1716 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1717 | if (km->notify) |
1718 | km->notify(x, c); | |
1da177e4 | 1719 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1720 | } |
1721 | ||
1722 | EXPORT_SYMBOL(km_policy_notify); | |
1723 | EXPORT_SYMBOL(km_state_notify); | |
1724 | ||
53bc6b4d | 1725 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad | 1726 | { |
98806f75 | 1727 | struct net *net = xs_net(x); |
26b15dad JHS |
1728 | struct km_event c; |
1729 | ||
bf08867f | 1730 | c.data.hard = hard; |
53bc6b4d | 1731 | c.pid = pid; |
f60f6b8f | 1732 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1733 | km_state_notify(x, &c); |
1da177e4 LT |
1734 | |
1735 | if (hard) | |
98806f75 | 1736 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
1737 | } |
1738 | ||
53bc6b4d | 1739 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1740 | /* |
1741 | * We send to all registered managers regardless of failure | |
1742 | * We are happy with one success | |
1743 | */ | |
980ebd25 | 1744 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1745 | { |
26b15dad | 1746 | int err = -EINVAL, acqret; |
1da177e4 LT |
1747 | struct xfrm_mgr *km; |
1748 | ||
1749 | read_lock(&xfrm_km_lock); | |
1750 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1751 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1752 | if (!acqret) | |
1753 | err = acqret; | |
1da177e4 LT |
1754 | } |
1755 | read_unlock(&xfrm_km_lock); | |
1756 | return err; | |
1757 | } | |
980ebd25 | 1758 | EXPORT_SYMBOL(km_query); |
1da177e4 | 1759 | |
5d36b180 | 1760 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) |
1da177e4 LT |
1761 | { |
1762 | int err = -EINVAL; | |
1763 | struct xfrm_mgr *km; | |
1764 | ||
1765 | read_lock(&xfrm_km_lock); | |
1766 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1767 | if (km->new_mapping) | |
1768 | err = km->new_mapping(x, ipaddr, sport); | |
1769 | if (!err) | |
1770 | break; | |
1771 | } | |
1772 | read_unlock(&xfrm_km_lock); | |
1773 | return err; | |
1774 | } | |
1775 | EXPORT_SYMBOL(km_new_mapping); | |
1776 | ||
6c5c8ca7 | 1777 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1778 | { |
98806f75 | 1779 | struct net *net = xp_net(pol); |
26b15dad | 1780 | struct km_event c; |
1da177e4 | 1781 | |
bf08867f | 1782 | c.data.hard = hard; |
6c5c8ca7 | 1783 | c.pid = pid; |
f60f6b8f | 1784 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1785 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1786 | |
1787 | if (hard) | |
98806f75 | 1788 | wake_up(&net->xfrm.km_waitq); |
1da177e4 | 1789 | } |
a70fcb0b | 1790 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1791 | |
2d60abc2 | 1792 | #ifdef CONFIG_XFRM_MIGRATE |
80c9abaa | 1793 | int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 AE |
1794 | struct xfrm_migrate *m, int num_migrate, |
1795 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
1796 | { |
1797 | int err = -EINVAL; | |
1798 | int ret; | |
1799 | struct xfrm_mgr *km; | |
1800 | ||
1801 | read_lock(&xfrm_km_lock); | |
1802 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1803 | if (km->migrate) { | |
13c1d189 | 1804 | ret = km->migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
1805 | if (!ret) |
1806 | err = ret; | |
1807 | } | |
1808 | } | |
1809 | read_unlock(&xfrm_km_lock); | |
1810 | return err; | |
1811 | } | |
1812 | EXPORT_SYMBOL(km_migrate); | |
2d60abc2 | 1813 | #endif |
80c9abaa | 1814 | |
db983c11 | 1815 | int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
97a64b45 MN |
1816 | { |
1817 | int err = -EINVAL; | |
1818 | int ret; | |
1819 | struct xfrm_mgr *km; | |
1820 | ||
1821 | read_lock(&xfrm_km_lock); | |
1822 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1823 | if (km->report) { | |
db983c11 | 1824 | ret = km->report(net, proto, sel, addr); |
97a64b45 MN |
1825 | if (!ret) |
1826 | err = ret; | |
1827 | } | |
1828 | } | |
1829 | read_unlock(&xfrm_km_lock); | |
1830 | return err; | |
1831 | } | |
1832 | EXPORT_SYMBOL(km_report); | |
1833 | ||
1da177e4 LT |
1834 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1835 | { | |
1836 | int err; | |
1837 | u8 *data; | |
1838 | struct xfrm_mgr *km; | |
1839 | struct xfrm_policy *pol = NULL; | |
1840 | ||
1841 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1842 | return -EMSGSIZE; | |
1843 | ||
1844 | data = kmalloc(optlen, GFP_KERNEL); | |
1845 | if (!data) | |
1846 | return -ENOMEM; | |
1847 | ||
1848 | err = -EFAULT; | |
1849 | if (copy_from_user(data, optval, optlen)) | |
1850 | goto out; | |
1851 | ||
1852 | err = -EINVAL; | |
1853 | read_lock(&xfrm_km_lock); | |
1854 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1855 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1856 | optlen, &err); |
1857 | if (err >= 0) | |
1858 | break; | |
1859 | } | |
1860 | read_unlock(&xfrm_km_lock); | |
1861 | ||
1862 | if (err >= 0) { | |
1863 | xfrm_sk_policy_insert(sk, err, pol); | |
1864 | xfrm_pol_put(pol); | |
1865 | err = 0; | |
1866 | } | |
1867 | ||
1868 | out: | |
1869 | kfree(data); | |
1870 | return err; | |
1871 | } | |
1872 | EXPORT_SYMBOL(xfrm_user_policy); | |
1873 | ||
1874 | int xfrm_register_km(struct xfrm_mgr *km) | |
1875 | { | |
1876 | write_lock_bh(&xfrm_km_lock); | |
1877 | list_add_tail(&km->list, &xfrm_km_list); | |
1878 | write_unlock_bh(&xfrm_km_lock); | |
1879 | return 0; | |
1880 | } | |
1881 | EXPORT_SYMBOL(xfrm_register_km); | |
1882 | ||
1883 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1884 | { | |
1885 | write_lock_bh(&xfrm_km_lock); | |
1886 | list_del(&km->list); | |
1887 | write_unlock_bh(&xfrm_km_lock); | |
1888 | return 0; | |
1889 | } | |
1890 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1891 | ||
1892 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1893 | { | |
1894 | int err = 0; | |
1895 | if (unlikely(afinfo == NULL)) | |
1896 | return -EINVAL; | |
1897 | if (unlikely(afinfo->family >= NPROTO)) | |
1898 | return -EAFNOSUPPORT; | |
f3111502 | 1899 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1900 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1901 | err = -ENOBUFS; | |
edcd5821 | 1902 | else |
1da177e4 | 1903 | xfrm_state_afinfo[afinfo->family] = afinfo; |
f3111502 | 1904 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1905 | return err; |
1906 | } | |
1907 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1908 | ||
1909 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1910 | { | |
1911 | int err = 0; | |
1912 | if (unlikely(afinfo == NULL)) | |
1913 | return -EINVAL; | |
1914 | if (unlikely(afinfo->family >= NPROTO)) | |
1915 | return -EAFNOSUPPORT; | |
f3111502 | 1916 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1917 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1918 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1919 | err = -EINVAL; | |
edcd5821 | 1920 | else |
1da177e4 | 1921 | xfrm_state_afinfo[afinfo->family] = NULL; |
1da177e4 | 1922 | } |
f3111502 | 1923 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1924 | return err; |
1925 | } | |
1926 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1927 | ||
17c2a42a | 1928 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) |
1da177e4 LT |
1929 | { |
1930 | struct xfrm_state_afinfo *afinfo; | |
1931 | if (unlikely(family >= NPROTO)) | |
1932 | return NULL; | |
1933 | read_lock(&xfrm_state_afinfo_lock); | |
1934 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1935 | if (unlikely(!afinfo)) |
1936 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1937 | return afinfo; |
1938 | } | |
1939 | ||
17c2a42a | 1940 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) |
9a429c49 | 1941 | __releases(xfrm_state_afinfo_lock) |
1da177e4 | 1942 | { |
546be240 | 1943 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1944 | } |
1945 | ||
1946 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1947 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1948 | { | |
1949 | if (x->tunnel) { | |
1950 | struct xfrm_state *t = x->tunnel; | |
1951 | ||
1952 | if (atomic_read(&t->tunnel_users) == 2) | |
1953 | xfrm_state_delete(t); | |
1954 | atomic_dec(&t->tunnel_users); | |
1955 | xfrm_state_put(t); | |
1956 | x->tunnel = NULL; | |
1957 | } | |
1958 | } | |
1959 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1960 | ||
1961 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) | |
1962 | { | |
c5c25238 | 1963 | int res; |
1da177e4 | 1964 | |
c5c25238 PM |
1965 | spin_lock_bh(&x->lock); |
1966 | if (x->km.state == XFRM_STATE_VALID && | |
1967 | x->type && x->type->get_mtu) | |
1968 | res = x->type->get_mtu(x, mtu); | |
1969 | else | |
28121617 | 1970 | res = mtu - x->props.header_len; |
c5c25238 | 1971 | spin_unlock_bh(&x->lock); |
1da177e4 LT |
1972 | return res; |
1973 | } | |
1974 | ||
72cb6962 HX |
1975 | int xfrm_init_state(struct xfrm_state *x) |
1976 | { | |
d094cd83 | 1977 | struct xfrm_state_afinfo *afinfo; |
df9dcb45 | 1978 | struct xfrm_mode *inner_mode; |
d094cd83 | 1979 | int family = x->props.family; |
72cb6962 HX |
1980 | int err; |
1981 | ||
d094cd83 HX |
1982 | err = -EAFNOSUPPORT; |
1983 | afinfo = xfrm_state_get_afinfo(family); | |
1984 | if (!afinfo) | |
1985 | goto error; | |
1986 | ||
1987 | err = 0; | |
1988 | if (afinfo->init_flags) | |
1989 | err = afinfo->init_flags(x); | |
1990 | ||
1991 | xfrm_state_put_afinfo(afinfo); | |
1992 | ||
1993 | if (err) | |
1994 | goto error; | |
1995 | ||
1996 | err = -EPROTONOSUPPORT; | |
13996378 | 1997 | |
df9dcb45 KM |
1998 | if (x->sel.family != AF_UNSPEC) { |
1999 | inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); | |
2000 | if (inner_mode == NULL) | |
2001 | goto error; | |
2002 | ||
2003 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && | |
2004 | family != x->sel.family) { | |
2005 | xfrm_put_mode(inner_mode); | |
2006 | goto error; | |
2007 | } | |
2008 | ||
2009 | x->inner_mode = inner_mode; | |
2010 | } else { | |
2011 | struct xfrm_mode *inner_mode_iaf; | |
d81d2285 | 2012 | int iafamily = AF_INET; |
df9dcb45 | 2013 | |
d81d2285 | 2014 | inner_mode = xfrm_get_mode(x->props.mode, x->props.family); |
df9dcb45 KM |
2015 | if (inner_mode == NULL) |
2016 | goto error; | |
2017 | ||
2018 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
2019 | xfrm_put_mode(inner_mode); | |
2020 | goto error; | |
2021 | } | |
d81d2285 | 2022 | x->inner_mode = inner_mode; |
df9dcb45 | 2023 | |
d81d2285 MW |
2024 | if (x->props.family == AF_INET) |
2025 | iafamily = AF_INET6; | |
df9dcb45 | 2026 | |
d81d2285 MW |
2027 | inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); |
2028 | if (inner_mode_iaf) { | |
2029 | if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) | |
2030 | x->inner_mode_iaf = inner_mode_iaf; | |
2031 | else | |
2032 | xfrm_put_mode(inner_mode_iaf); | |
df9dcb45 KM |
2033 | } |
2034 | } | |
13996378 | 2035 | |
d094cd83 | 2036 | x->type = xfrm_get_type(x->id.proto, family); |
72cb6962 HX |
2037 | if (x->type == NULL) |
2038 | goto error; | |
2039 | ||
2040 | err = x->type->init_state(x); | |
2041 | if (err) | |
2042 | goto error; | |
2043 | ||
13996378 HX |
2044 | x->outer_mode = xfrm_get_mode(x->props.mode, family); |
2045 | if (x->outer_mode == NULL) | |
b59f45d0 HX |
2046 | goto error; |
2047 | ||
72cb6962 HX |
2048 | x->km.state = XFRM_STATE_VALID; |
2049 | ||
2050 | error: | |
2051 | return err; | |
2052 | } | |
2053 | ||
2054 | EXPORT_SYMBOL(xfrm_init_state); | |
a716c119 | 2055 | |
d62ddc21 | 2056 | int __net_init xfrm_state_init(struct net *net) |
1da177e4 | 2057 | { |
f034b5d4 DM |
2058 | unsigned int sz; |
2059 | ||
9d4139c7 AD |
2060 | INIT_LIST_HEAD(&net->xfrm.state_all); |
2061 | ||
f034b5d4 DM |
2062 | sz = sizeof(struct hlist_head) * 8; |
2063 | ||
73d189dc AD |
2064 | net->xfrm.state_bydst = xfrm_hash_alloc(sz); |
2065 | if (!net->xfrm.state_bydst) | |
2066 | goto out_bydst; | |
d320bbb3 AD |
2067 | net->xfrm.state_bysrc = xfrm_hash_alloc(sz); |
2068 | if (!net->xfrm.state_bysrc) | |
2069 | goto out_bysrc; | |
b754a4fd AD |
2070 | net->xfrm.state_byspi = xfrm_hash_alloc(sz); |
2071 | if (!net->xfrm.state_byspi) | |
2072 | goto out_byspi; | |
529983ec | 2073 | net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); |
1da177e4 | 2074 | |
0bf7c5b0 | 2075 | net->xfrm.state_num = 0; |
63082733 | 2076 | INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); |
b8a0ae20 | 2077 | INIT_HLIST_HEAD(&net->xfrm.state_gc_list); |
c7837144 | 2078 | INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); |
50a30657 | 2079 | init_waitqueue_head(&net->xfrm.km_waitq); |
d62ddc21 | 2080 | return 0; |
73d189dc | 2081 | |
b754a4fd AD |
2082 | out_byspi: |
2083 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
d320bbb3 AD |
2084 | out_bysrc: |
2085 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
73d189dc AD |
2086 | out_bydst: |
2087 | return -ENOMEM; | |
d62ddc21 AD |
2088 | } |
2089 | ||
2090 | void xfrm_state_fini(struct net *net) | |
2091 | { | |
7c2776ee | 2092 | struct xfrm_audit audit_info; |
73d189dc AD |
2093 | unsigned int sz; |
2094 | ||
7c2776ee AD |
2095 | flush_work(&net->xfrm.state_hash_work); |
2096 | audit_info.loginuid = -1; | |
2097 | audit_info.sessionid = -1; | |
2098 | audit_info.secid = 0; | |
2099 | xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info); | |
2100 | flush_work(&net->xfrm.state_gc_work); | |
2101 | ||
9d4139c7 | 2102 | WARN_ON(!list_empty(&net->xfrm.state_all)); |
73d189dc | 2103 | |
529983ec | 2104 | sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); |
b754a4fd AD |
2105 | WARN_ON(!hlist_empty(net->xfrm.state_byspi)); |
2106 | xfrm_hash_free(net->xfrm.state_byspi, sz); | |
d320bbb3 AD |
2107 | WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); |
2108 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
73d189dc AD |
2109 | WARN_ON(!hlist_empty(net->xfrm.state_bydst)); |
2110 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
1da177e4 LT |
2111 | } |
2112 | ||
ab5f5e8b | 2113 | #ifdef CONFIG_AUDITSYSCALL |
cf35f43e IJ |
2114 | static void xfrm_audit_helper_sainfo(struct xfrm_state *x, |
2115 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2116 | { |
68277acc PM |
2117 | struct xfrm_sec_ctx *ctx = x->security; |
2118 | u32 spi = ntohl(x->id.spi); | |
2119 | ||
2120 | if (ctx) | |
ab5f5e8b | 2121 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
68277acc | 2122 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b JL |
2123 | |
2124 | switch(x->props.family) { | |
2125 | case AF_INET: | |
21454aaa HH |
2126 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2127 | &x->props.saddr.a4, &x->id.daddr.a4); | |
ab5f5e8b JL |
2128 | break; |
2129 | case AF_INET6: | |
5b095d98 | 2130 | audit_log_format(audit_buf, " src=%pI6 dst=%pI6", |
fdb46ee7 | 2131 | x->props.saddr.a6, x->id.daddr.a6); |
ab5f5e8b JL |
2132 | break; |
2133 | } | |
68277acc PM |
2134 | |
2135 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
ab5f5e8b JL |
2136 | } |
2137 | ||
cf35f43e IJ |
2138 | static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, |
2139 | struct audit_buffer *audit_buf) | |
afeb14b4 PM |
2140 | { |
2141 | struct iphdr *iph4; | |
2142 | struct ipv6hdr *iph6; | |
2143 | ||
2144 | switch (family) { | |
2145 | case AF_INET: | |
2146 | iph4 = ip_hdr(skb); | |
21454aaa HH |
2147 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2148 | &iph4->saddr, &iph4->daddr); | |
afeb14b4 PM |
2149 | break; |
2150 | case AF_INET6: | |
2151 | iph6 = ipv6_hdr(skb); | |
2152 | audit_log_format(audit_buf, | |
5b095d98 | 2153 | " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", |
fdb46ee7 | 2154 | &iph6->saddr,&iph6->daddr, |
afeb14b4 PM |
2155 | iph6->flow_lbl[0] & 0x0f, |
2156 | iph6->flow_lbl[1], | |
2157 | iph6->flow_lbl[2]); | |
2158 | break; | |
2159 | } | |
2160 | } | |
2161 | ||
68277acc | 2162 | void xfrm_audit_state_add(struct xfrm_state *x, int result, |
2532386f | 2163 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2164 | { |
2165 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2166 | |
afeb14b4 | 2167 | audit_buf = xfrm_audit_start("SAD-add"); |
ab5f5e8b JL |
2168 | if (audit_buf == NULL) |
2169 | return; | |
2532386f | 2170 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2171 | xfrm_audit_helper_sainfo(x, audit_buf); |
2172 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2173 | audit_log_end(audit_buf); |
2174 | } | |
2175 | EXPORT_SYMBOL_GPL(xfrm_audit_state_add); | |
2176 | ||
68277acc | 2177 | void xfrm_audit_state_delete(struct xfrm_state *x, int result, |
2532386f | 2178 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2179 | { |
2180 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2181 | |
afeb14b4 | 2182 | audit_buf = xfrm_audit_start("SAD-delete"); |
ab5f5e8b JL |
2183 | if (audit_buf == NULL) |
2184 | return; | |
2532386f | 2185 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2186 | xfrm_audit_helper_sainfo(x, audit_buf); |
2187 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2188 | audit_log_end(audit_buf); |
2189 | } | |
2190 | EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); | |
afeb14b4 PM |
2191 | |
2192 | void xfrm_audit_state_replay_overflow(struct xfrm_state *x, | |
2193 | struct sk_buff *skb) | |
2194 | { | |
2195 | struct audit_buffer *audit_buf; | |
2196 | u32 spi; | |
2197 | ||
2198 | audit_buf = xfrm_audit_start("SA-replay-overflow"); | |
2199 | if (audit_buf == NULL) | |
2200 | return; | |
2201 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2202 | /* don't record the sequence number because it's inherent in this kind | |
2203 | * of audit message */ | |
2204 | spi = ntohl(x->id.spi); | |
2205 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
2206 | audit_log_end(audit_buf); | |
2207 | } | |
2208 | EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); | |
2209 | ||
2210 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
2211 | struct sk_buff *skb, __be32 net_seq) | |
2212 | { | |
2213 | struct audit_buffer *audit_buf; | |
2214 | u32 spi; | |
2215 | ||
2216 | audit_buf = xfrm_audit_start("SA-replayed-pkt"); | |
2217 | if (audit_buf == NULL) | |
2218 | return; | |
2219 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2220 | spi = ntohl(x->id.spi); | |
2221 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2222 | spi, spi, ntohl(net_seq)); | |
2223 | audit_log_end(audit_buf); | |
2224 | } | |
2225 | ||
2226 | void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) | |
2227 | { | |
2228 | struct audit_buffer *audit_buf; | |
2229 | ||
2230 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2231 | if (audit_buf == NULL) | |
2232 | return; | |
2233 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2234 | audit_log_end(audit_buf); | |
2235 | } | |
2236 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); | |
2237 | ||
2238 | void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, | |
2239 | __be32 net_spi, __be32 net_seq) | |
2240 | { | |
2241 | struct audit_buffer *audit_buf; | |
2242 | u32 spi; | |
2243 | ||
2244 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2245 | if (audit_buf == NULL) | |
2246 | return; | |
2247 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2248 | spi = ntohl(net_spi); | |
2249 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2250 | spi, spi, ntohl(net_seq)); | |
2251 | audit_log_end(audit_buf); | |
2252 | } | |
2253 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); | |
2254 | ||
2255 | void xfrm_audit_state_icvfail(struct xfrm_state *x, | |
2256 | struct sk_buff *skb, u8 proto) | |
2257 | { | |
2258 | struct audit_buffer *audit_buf; | |
2259 | __be32 net_spi; | |
2260 | __be32 net_seq; | |
2261 | ||
2262 | audit_buf = xfrm_audit_start("SA-icv-failure"); | |
2263 | if (audit_buf == NULL) | |
2264 | return; | |
2265 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2266 | if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { | |
2267 | u32 spi = ntohl(net_spi); | |
2268 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2269 | spi, spi, ntohl(net_seq)); | |
2270 | } | |
2271 | audit_log_end(audit_buf); | |
2272 | } | |
2273 | EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); | |
ab5f5e8b | 2274 | #endif /* CONFIG_AUDITSYSCALL */ |