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> |
1da177e4 | 24 | |
44e36b42 DM |
25 | #include "xfrm_hash.h" |
26 | ||
1da177e4 LT |
27 | /* Each xfrm_state may be linked to two tables: |
28 | ||
29 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) | |
a624c108 | 30 | 2. Hash table by (daddr,family,reqid) to find what SAs exist for given |
1da177e4 LT |
31 | destination/tunnel endpoint. (output) |
32 | */ | |
33 | ||
34 | static DEFINE_SPINLOCK(xfrm_state_lock); | |
35 | ||
f034b5d4 | 36 | static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; |
9d4a706d | 37 | static unsigned int xfrm_state_genid; |
f034b5d4 | 38 | |
17c2a42a HX |
39 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); |
40 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
41 | ||
afeb14b4 PM |
42 | #ifdef CONFIG_AUDITSYSCALL |
43 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
44 | struct sk_buff *skb, __be32 net_seq); | |
45 | #else | |
46 | #define xfrm_audit_state_replay(x, s, sq) do { ; } while (0) | |
47 | #endif /* CONFIG_AUDITSYSCALL */ | |
48 | ||
64d0cd00 AD |
49 | static inline unsigned int xfrm_dst_hash(struct net *net, |
50 | xfrm_address_t *daddr, | |
c1969f29 DM |
51 | xfrm_address_t *saddr, |
52 | u32 reqid, | |
a624c108 | 53 | unsigned short family) |
f034b5d4 | 54 | { |
64d0cd00 | 55 | return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); |
f034b5d4 DM |
56 | } |
57 | ||
64d0cd00 AD |
58 | static inline unsigned int xfrm_src_hash(struct net *net, |
59 | xfrm_address_t *daddr, | |
667bbcb6 | 60 | xfrm_address_t *saddr, |
44e36b42 | 61 | unsigned short family) |
f034b5d4 | 62 | { |
64d0cd00 | 63 | return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); |
f034b5d4 DM |
64 | } |
65 | ||
f034b5d4 | 66 | static inline unsigned int |
64d0cd00 | 67 | xfrm_spi_hash(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
f034b5d4 | 68 | { |
64d0cd00 | 69 | return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); |
f034b5d4 DM |
70 | } |
71 | ||
f034b5d4 DM |
72 | static void xfrm_hash_transfer(struct hlist_head *list, |
73 | struct hlist_head *ndsttable, | |
74 | struct hlist_head *nsrctable, | |
75 | struct hlist_head *nspitable, | |
76 | unsigned int nhashmask) | |
77 | { | |
78 | struct hlist_node *entry, *tmp; | |
79 | struct xfrm_state *x; | |
80 | ||
81 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
82 | unsigned int h; | |
83 | ||
c1969f29 DM |
84 | h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
85 | x->props.reqid, x->props.family, | |
86 | nhashmask); | |
f034b5d4 DM |
87 | hlist_add_head(&x->bydst, ndsttable+h); |
88 | ||
667bbcb6 MN |
89 | h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, |
90 | x->props.family, | |
f034b5d4 DM |
91 | nhashmask); |
92 | hlist_add_head(&x->bysrc, nsrctable+h); | |
93 | ||
7b4dc360 MN |
94 | if (x->id.spi) { |
95 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, | |
96 | x->id.proto, x->props.family, | |
97 | nhashmask); | |
98 | hlist_add_head(&x->byspi, nspitable+h); | |
99 | } | |
f034b5d4 DM |
100 | } |
101 | } | |
102 | ||
63082733 | 103 | static unsigned long xfrm_hash_new_size(unsigned int state_hmask) |
f034b5d4 | 104 | { |
63082733 | 105 | return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); |
f034b5d4 DM |
106 | } |
107 | ||
108 | static DEFINE_MUTEX(hash_resize_mutex); | |
109 | ||
63082733 | 110 | static void xfrm_hash_resize(struct work_struct *work) |
f034b5d4 | 111 | { |
63082733 | 112 | struct net *net = container_of(work, struct net, xfrm.state_hash_work); |
f034b5d4 DM |
113 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; |
114 | unsigned long nsize, osize; | |
115 | unsigned int nhashmask, ohashmask; | |
116 | int i; | |
117 | ||
118 | mutex_lock(&hash_resize_mutex); | |
119 | ||
63082733 | 120 | nsize = xfrm_hash_new_size(net->xfrm.state_hmask); |
44e36b42 | 121 | ndst = xfrm_hash_alloc(nsize); |
f034b5d4 DM |
122 | if (!ndst) |
123 | goto out_unlock; | |
44e36b42 | 124 | nsrc = xfrm_hash_alloc(nsize); |
f034b5d4 | 125 | if (!nsrc) { |
44e36b42 | 126 | xfrm_hash_free(ndst, nsize); |
f034b5d4 DM |
127 | goto out_unlock; |
128 | } | |
44e36b42 | 129 | nspi = xfrm_hash_alloc(nsize); |
f034b5d4 | 130 | if (!nspi) { |
44e36b42 DM |
131 | xfrm_hash_free(ndst, nsize); |
132 | xfrm_hash_free(nsrc, nsize); | |
f034b5d4 DM |
133 | goto out_unlock; |
134 | } | |
135 | ||
136 | spin_lock_bh(&xfrm_state_lock); | |
137 | ||
138 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
63082733 AD |
139 | for (i = net->xfrm.state_hmask; i >= 0; i--) |
140 | xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi, | |
f034b5d4 DM |
141 | nhashmask); |
142 | ||
63082733 AD |
143 | odst = net->xfrm.state_bydst; |
144 | osrc = net->xfrm.state_bysrc; | |
145 | ospi = net->xfrm.state_byspi; | |
146 | ohashmask = net->xfrm.state_hmask; | |
f034b5d4 | 147 | |
63082733 AD |
148 | net->xfrm.state_bydst = ndst; |
149 | net->xfrm.state_bysrc = nsrc; | |
150 | net->xfrm.state_byspi = nspi; | |
151 | net->xfrm.state_hmask = nhashmask; | |
f034b5d4 DM |
152 | |
153 | spin_unlock_bh(&xfrm_state_lock); | |
154 | ||
155 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 DM |
156 | xfrm_hash_free(odst, osize); |
157 | xfrm_hash_free(osrc, osize); | |
158 | xfrm_hash_free(ospi, osize); | |
f034b5d4 DM |
159 | |
160 | out_unlock: | |
161 | mutex_unlock(&hash_resize_mutex); | |
162 | } | |
163 | ||
1da177e4 LT |
164 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); |
165 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
166 | ||
1da177e4 LT |
167 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
168 | ||
53bc6b4d | 169 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 | 170 | |
980ebd25 | 171 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d | 172 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
1da177e4 | 173 | |
aa5d62cc HX |
174 | static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family) |
175 | { | |
176 | struct xfrm_state_afinfo *afinfo; | |
177 | if (unlikely(family >= NPROTO)) | |
178 | return NULL; | |
179 | write_lock_bh(&xfrm_state_afinfo_lock); | |
180 | afinfo = xfrm_state_afinfo[family]; | |
181 | if (unlikely(!afinfo)) | |
182 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
183 | return afinfo; | |
184 | } | |
185 | ||
186 | static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo) | |
9a429c49 | 187 | __releases(xfrm_state_afinfo_lock) |
aa5d62cc HX |
188 | { |
189 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
190 | } | |
191 | ||
533cb5b0 | 192 | int xfrm_register_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
193 | { |
194 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 195 | const struct xfrm_type **typemap; |
aa5d62cc HX |
196 | int err = 0; |
197 | ||
198 | if (unlikely(afinfo == NULL)) | |
199 | return -EAFNOSUPPORT; | |
200 | typemap = afinfo->type_map; | |
201 | ||
202 | if (likely(typemap[type->proto] == NULL)) | |
203 | typemap[type->proto] = type; | |
204 | else | |
205 | err = -EEXIST; | |
206 | xfrm_state_unlock_afinfo(afinfo); | |
207 | return err; | |
208 | } | |
209 | EXPORT_SYMBOL(xfrm_register_type); | |
210 | ||
533cb5b0 | 211 | int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
212 | { |
213 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 214 | const struct xfrm_type **typemap; |
aa5d62cc HX |
215 | int err = 0; |
216 | ||
217 | if (unlikely(afinfo == NULL)) | |
218 | return -EAFNOSUPPORT; | |
219 | typemap = afinfo->type_map; | |
220 | ||
221 | if (unlikely(typemap[type->proto] != type)) | |
222 | err = -ENOENT; | |
223 | else | |
224 | typemap[type->proto] = NULL; | |
225 | xfrm_state_unlock_afinfo(afinfo); | |
226 | return err; | |
227 | } | |
228 | EXPORT_SYMBOL(xfrm_unregister_type); | |
229 | ||
533cb5b0 | 230 | static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) |
aa5d62cc HX |
231 | { |
232 | struct xfrm_state_afinfo *afinfo; | |
533cb5b0 ED |
233 | const struct xfrm_type **typemap; |
234 | const struct xfrm_type *type; | |
aa5d62cc HX |
235 | int modload_attempted = 0; |
236 | ||
237 | retry: | |
238 | afinfo = xfrm_state_get_afinfo(family); | |
239 | if (unlikely(afinfo == NULL)) | |
240 | return NULL; | |
241 | typemap = afinfo->type_map; | |
242 | ||
243 | type = typemap[proto]; | |
244 | if (unlikely(type && !try_module_get(type->owner))) | |
245 | type = NULL; | |
246 | if (!type && !modload_attempted) { | |
247 | xfrm_state_put_afinfo(afinfo); | |
248 | request_module("xfrm-type-%d-%d", family, proto); | |
249 | modload_attempted = 1; | |
250 | goto retry; | |
251 | } | |
252 | ||
253 | xfrm_state_put_afinfo(afinfo); | |
254 | return type; | |
255 | } | |
256 | ||
533cb5b0 | 257 | static void xfrm_put_type(const struct xfrm_type *type) |
aa5d62cc HX |
258 | { |
259 | module_put(type->owner); | |
260 | } | |
261 | ||
262 | int xfrm_register_mode(struct xfrm_mode *mode, int family) | |
263 | { | |
264 | struct xfrm_state_afinfo *afinfo; | |
265 | struct xfrm_mode **modemap; | |
266 | int err; | |
267 | ||
268 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
269 | return -EINVAL; | |
270 | ||
271 | afinfo = xfrm_state_lock_afinfo(family); | |
272 | if (unlikely(afinfo == NULL)) | |
273 | return -EAFNOSUPPORT; | |
274 | ||
275 | err = -EEXIST; | |
276 | modemap = afinfo->mode_map; | |
17c2a42a HX |
277 | if (modemap[mode->encap]) |
278 | goto out; | |
aa5d62cc | 279 | |
17c2a42a HX |
280 | err = -ENOENT; |
281 | if (!try_module_get(afinfo->owner)) | |
282 | goto out; | |
283 | ||
284 | mode->afinfo = afinfo; | |
285 | modemap[mode->encap] = mode; | |
286 | err = 0; | |
287 | ||
288 | out: | |
aa5d62cc HX |
289 | xfrm_state_unlock_afinfo(afinfo); |
290 | return err; | |
291 | } | |
292 | EXPORT_SYMBOL(xfrm_register_mode); | |
293 | ||
294 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
295 | { | |
296 | struct xfrm_state_afinfo *afinfo; | |
297 | struct xfrm_mode **modemap; | |
298 | int err; | |
299 | ||
300 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
301 | return -EINVAL; | |
302 | ||
303 | afinfo = xfrm_state_lock_afinfo(family); | |
304 | if (unlikely(afinfo == NULL)) | |
305 | return -EAFNOSUPPORT; | |
306 | ||
307 | err = -ENOENT; | |
308 | modemap = afinfo->mode_map; | |
309 | if (likely(modemap[mode->encap] == mode)) { | |
310 | modemap[mode->encap] = NULL; | |
17c2a42a | 311 | module_put(mode->afinfo->owner); |
aa5d62cc HX |
312 | err = 0; |
313 | } | |
314 | ||
315 | xfrm_state_unlock_afinfo(afinfo); | |
316 | return err; | |
317 | } | |
318 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
319 | ||
320 | static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
321 | { | |
322 | struct xfrm_state_afinfo *afinfo; | |
323 | struct xfrm_mode *mode; | |
324 | int modload_attempted = 0; | |
325 | ||
326 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
327 | return NULL; | |
328 | ||
329 | retry: | |
330 | afinfo = xfrm_state_get_afinfo(family); | |
331 | if (unlikely(afinfo == NULL)) | |
332 | return NULL; | |
333 | ||
334 | mode = afinfo->mode_map[encap]; | |
335 | if (unlikely(mode && !try_module_get(mode->owner))) | |
336 | mode = NULL; | |
337 | if (!mode && !modload_attempted) { | |
338 | xfrm_state_put_afinfo(afinfo); | |
339 | request_module("xfrm-mode-%d-%d", family, encap); | |
340 | modload_attempted = 1; | |
341 | goto retry; | |
342 | } | |
343 | ||
344 | xfrm_state_put_afinfo(afinfo); | |
345 | return mode; | |
346 | } | |
347 | ||
348 | static void xfrm_put_mode(struct xfrm_mode *mode) | |
349 | { | |
350 | module_put(mode->owner); | |
351 | } | |
352 | ||
1da177e4 LT |
353 | static void xfrm_state_gc_destroy(struct xfrm_state *x) |
354 | { | |
a47f0ce0 DM |
355 | del_timer_sync(&x->timer); |
356 | del_timer_sync(&x->rtimer); | |
a51482bd JJ |
357 | kfree(x->aalg); |
358 | kfree(x->ealg); | |
359 | kfree(x->calg); | |
360 | kfree(x->encap); | |
060f02a3 | 361 | kfree(x->coaddr); |
13996378 HX |
362 | if (x->inner_mode) |
363 | xfrm_put_mode(x->inner_mode); | |
df9dcb45 KM |
364 | if (x->inner_mode_iaf) |
365 | xfrm_put_mode(x->inner_mode_iaf); | |
13996378 HX |
366 | if (x->outer_mode) |
367 | xfrm_put_mode(x->outer_mode); | |
1da177e4 LT |
368 | if (x->type) { |
369 | x->type->destructor(x); | |
370 | xfrm_put_type(x->type); | |
371 | } | |
df71837d | 372 | security_xfrm_state_free(x); |
1da177e4 LT |
373 | kfree(x); |
374 | } | |
375 | ||
c7837144 | 376 | static void xfrm_state_gc_task(struct work_struct *work) |
1da177e4 | 377 | { |
c7837144 | 378 | struct net *net = container_of(work, struct net, xfrm.state_gc_work); |
12a169e7 HX |
379 | struct xfrm_state *x; |
380 | struct hlist_node *entry, *tmp; | |
381 | struct hlist_head gc_list; | |
1da177e4 | 382 | |
1da177e4 | 383 | spin_lock_bh(&xfrm_state_gc_lock); |
c7837144 | 384 | hlist_move_list(&net->xfrm.state_gc_list, &gc_list); |
1da177e4 LT |
385 | spin_unlock_bh(&xfrm_state_gc_lock); |
386 | ||
12a169e7 | 387 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist) |
1da177e4 | 388 | xfrm_state_gc_destroy(x); |
8f126e37 | 389 | |
50a30657 | 390 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
391 | } |
392 | ||
393 | static inline unsigned long make_jiffies(long secs) | |
394 | { | |
395 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
396 | return MAX_SCHEDULE_TIMEOUT-1; | |
397 | else | |
a716c119 | 398 | return secs*HZ; |
1da177e4 LT |
399 | } |
400 | ||
401 | static void xfrm_timer_handler(unsigned long data) | |
402 | { | |
403 | struct xfrm_state *x = (struct xfrm_state*)data; | |
98806f75 | 404 | struct net *net = xs_net(x); |
9d729f72 | 405 | unsigned long now = get_seconds(); |
1da177e4 LT |
406 | long next = LONG_MAX; |
407 | int warn = 0; | |
161a09e7 | 408 | int err = 0; |
1da177e4 LT |
409 | |
410 | spin_lock(&x->lock); | |
411 | if (x->km.state == XFRM_STATE_DEAD) | |
412 | goto out; | |
413 | if (x->km.state == XFRM_STATE_EXPIRED) | |
414 | goto expired; | |
415 | if (x->lft.hard_add_expires_seconds) { | |
416 | long tmo = x->lft.hard_add_expires_seconds + | |
417 | x->curlft.add_time - now; | |
418 | if (tmo <= 0) | |
419 | goto expired; | |
420 | if (tmo < next) | |
421 | next = tmo; | |
422 | } | |
423 | if (x->lft.hard_use_expires_seconds) { | |
424 | long tmo = x->lft.hard_use_expires_seconds + | |
425 | (x->curlft.use_time ? : now) - now; | |
426 | if (tmo <= 0) | |
427 | goto expired; | |
428 | if (tmo < next) | |
429 | next = tmo; | |
430 | } | |
431 | if (x->km.dying) | |
432 | goto resched; | |
433 | if (x->lft.soft_add_expires_seconds) { | |
434 | long tmo = x->lft.soft_add_expires_seconds + | |
435 | x->curlft.add_time - now; | |
436 | if (tmo <= 0) | |
437 | warn = 1; | |
438 | else if (tmo < next) | |
439 | next = tmo; | |
440 | } | |
441 | if (x->lft.soft_use_expires_seconds) { | |
442 | long tmo = x->lft.soft_use_expires_seconds + | |
443 | (x->curlft.use_time ? : now) - now; | |
444 | if (tmo <= 0) | |
445 | warn = 1; | |
446 | else if (tmo < next) | |
447 | next = tmo; | |
448 | } | |
449 | ||
4666faab | 450 | x->km.dying = warn; |
1da177e4 | 451 | if (warn) |
53bc6b4d | 452 | km_state_expired(x, 0, 0); |
1da177e4 | 453 | resched: |
a47f0ce0 DM |
454 | if (next != LONG_MAX) |
455 | mod_timer(&x->timer, jiffies + make_jiffies(next)); | |
456 | ||
1da177e4 LT |
457 | goto out; |
458 | ||
459 | expired: | |
460 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
461 | x->km.state = XFRM_STATE_EXPIRED; | |
98806f75 | 462 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
463 | next = 2; |
464 | goto resched; | |
465 | } | |
161a09e7 JL |
466 | |
467 | err = __xfrm_state_delete(x); | |
468 | if (!err && x->id.spi) | |
53bc6b4d | 469 | km_state_expired(x, 1, 0); |
1da177e4 | 470 | |
ab5f5e8b | 471 | xfrm_audit_state_delete(x, err ? 0 : 1, |
2532386f EP |
472 | audit_get_loginuid(current), |
473 | audit_get_sessionid(current), 0); | |
161a09e7 | 474 | |
1da177e4 LT |
475 | out: |
476 | spin_unlock(&x->lock); | |
1da177e4 LT |
477 | } |
478 | ||
0ac84752 DM |
479 | static void xfrm_replay_timer_handler(unsigned long data); |
480 | ||
673c09be | 481 | struct xfrm_state *xfrm_state_alloc(struct net *net) |
1da177e4 LT |
482 | { |
483 | struct xfrm_state *x; | |
484 | ||
0da974f4 | 485 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
486 | |
487 | if (x) { | |
673c09be | 488 | write_pnet(&x->xs_net, net); |
1da177e4 LT |
489 | atomic_set(&x->refcnt, 1); |
490 | atomic_set(&x->tunnel_users, 0); | |
12a169e7 | 491 | INIT_LIST_HEAD(&x->km.all); |
8f126e37 DM |
492 | INIT_HLIST_NODE(&x->bydst); |
493 | INIT_HLIST_NODE(&x->bysrc); | |
494 | INIT_HLIST_NODE(&x->byspi); | |
b24b8a24 PE |
495 | setup_timer(&x->timer, xfrm_timer_handler, (unsigned long)x); |
496 | setup_timer(&x->rtimer, xfrm_replay_timer_handler, | |
497 | (unsigned long)x); | |
9d729f72 | 498 | x->curlft.add_time = get_seconds(); |
1da177e4 LT |
499 | x->lft.soft_byte_limit = XFRM_INF; |
500 | x->lft.soft_packet_limit = XFRM_INF; | |
501 | x->lft.hard_byte_limit = XFRM_INF; | |
502 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
503 | x->replay_maxage = 0; |
504 | x->replay_maxdiff = 0; | |
df9dcb45 KM |
505 | x->inner_mode = NULL; |
506 | x->inner_mode_iaf = NULL; | |
1da177e4 LT |
507 | spin_lock_init(&x->lock); |
508 | } | |
509 | return x; | |
510 | } | |
511 | EXPORT_SYMBOL(xfrm_state_alloc); | |
512 | ||
513 | void __xfrm_state_destroy(struct xfrm_state *x) | |
514 | { | |
98806f75 AD |
515 | struct net *net = xs_net(x); |
516 | ||
547b792c | 517 | WARN_ON(x->km.state != XFRM_STATE_DEAD); |
1da177e4 LT |
518 | |
519 | spin_lock_bh(&xfrm_state_gc_lock); | |
98806f75 | 520 | hlist_add_head(&x->gclist, &net->xfrm.state_gc_list); |
1da177e4 | 521 | spin_unlock_bh(&xfrm_state_gc_lock); |
98806f75 | 522 | schedule_work(&net->xfrm.state_gc_work); |
1da177e4 LT |
523 | } |
524 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
525 | ||
53bc6b4d | 526 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 527 | { |
98806f75 | 528 | struct net *net = xs_net(x); |
26b15dad JHS |
529 | int err = -ESRCH; |
530 | ||
1da177e4 LT |
531 | if (x->km.state != XFRM_STATE_DEAD) { |
532 | x->km.state = XFRM_STATE_DEAD; | |
533 | spin_lock(&xfrm_state_lock); | |
12a169e7 | 534 | list_del(&x->km.all); |
8f126e37 | 535 | hlist_del(&x->bydst); |
8f126e37 | 536 | hlist_del(&x->bysrc); |
a47f0ce0 | 537 | if (x->id.spi) |
8f126e37 | 538 | hlist_del(&x->byspi); |
98806f75 | 539 | net->xfrm.state_num--; |
1da177e4 | 540 | spin_unlock(&xfrm_state_lock); |
1da177e4 | 541 | |
1da177e4 LT |
542 | /* All xfrm_state objects are created by xfrm_state_alloc. |
543 | * The xfrm_state_alloc call gives a reference, and that | |
544 | * is what we are dropping here. | |
545 | */ | |
5dba4797 | 546 | xfrm_state_put(x); |
26b15dad | 547 | err = 0; |
1da177e4 | 548 | } |
26b15dad JHS |
549 | |
550 | return err; | |
1da177e4 | 551 | } |
53bc6b4d | 552 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 553 | |
26b15dad | 554 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 555 | { |
26b15dad JHS |
556 | int err; |
557 | ||
1da177e4 | 558 | spin_lock_bh(&x->lock); |
26b15dad | 559 | err = __xfrm_state_delete(x); |
1da177e4 | 560 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
561 | |
562 | return err; | |
1da177e4 LT |
563 | } |
564 | EXPORT_SYMBOL(xfrm_state_delete); | |
565 | ||
4aa2e62c JL |
566 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
567 | static inline int | |
0e602451 | 568 | xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
1da177e4 | 569 | { |
4aa2e62c JL |
570 | int i, err = 0; |
571 | ||
0e602451 | 572 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
4aa2e62c JL |
573 | struct hlist_node *entry; |
574 | struct xfrm_state *x; | |
575 | ||
0e602451 | 576 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
4aa2e62c JL |
577 | if (xfrm_id_proto_match(x->id.proto, proto) && |
578 | (err = security_xfrm_state_delete(x)) != 0) { | |
ab5f5e8b JL |
579 | xfrm_audit_state_delete(x, 0, |
580 | audit_info->loginuid, | |
2532386f | 581 | audit_info->sessionid, |
ab5f5e8b | 582 | audit_info->secid); |
4aa2e62c JL |
583 | return err; |
584 | } | |
585 | } | |
586 | } | |
587 | ||
588 | return err; | |
589 | } | |
590 | #else | |
591 | static inline int | |
0e602451 | 592 | xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
4aa2e62c JL |
593 | { |
594 | return 0; | |
595 | } | |
596 | #endif | |
597 | ||
0e602451 | 598 | int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
4aa2e62c JL |
599 | { |
600 | int i, err = 0; | |
1da177e4 LT |
601 | |
602 | spin_lock_bh(&xfrm_state_lock); | |
0e602451 | 603 | err = xfrm_state_flush_secctx_check(net, proto, audit_info); |
4aa2e62c JL |
604 | if (err) |
605 | goto out; | |
606 | ||
0e602451 | 607 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
608 | struct hlist_node *entry; |
609 | struct xfrm_state *x; | |
1da177e4 | 610 | restart: |
0e602451 | 611 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
1da177e4 | 612 | if (!xfrm_state_kern(x) && |
5794708f | 613 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
614 | xfrm_state_hold(x); |
615 | spin_unlock_bh(&xfrm_state_lock); | |
616 | ||
161a09e7 | 617 | err = xfrm_state_delete(x); |
ab5f5e8b JL |
618 | xfrm_audit_state_delete(x, err ? 0 : 1, |
619 | audit_info->loginuid, | |
2532386f | 620 | audit_info->sessionid, |
ab5f5e8b | 621 | audit_info->secid); |
1da177e4 LT |
622 | xfrm_state_put(x); |
623 | ||
624 | spin_lock_bh(&xfrm_state_lock); | |
625 | goto restart; | |
626 | } | |
627 | } | |
628 | } | |
4aa2e62c JL |
629 | err = 0; |
630 | ||
631 | out: | |
1da177e4 | 632 | spin_unlock_bh(&xfrm_state_lock); |
0e602451 | 633 | wake_up(&net->xfrm.km_waitq); |
4aa2e62c | 634 | return err; |
1da177e4 LT |
635 | } |
636 | EXPORT_SYMBOL(xfrm_state_flush); | |
637 | ||
af11e316 | 638 | void xfrm_sad_getinfo(struct xfrmk_sadinfo *si) |
28d8909b JHS |
639 | { |
640 | spin_lock_bh(&xfrm_state_lock); | |
0bf7c5b0 | 641 | si->sadcnt = init_net.xfrm.state_num; |
529983ec | 642 | si->sadhcnt = init_net.xfrm.state_hmask; |
28d8909b JHS |
643 | si->sadhmcnt = xfrm_state_hashmax; |
644 | spin_unlock_bh(&xfrm_state_lock); | |
645 | } | |
646 | EXPORT_SYMBOL(xfrm_sad_getinfo); | |
647 | ||
1da177e4 LT |
648 | static int |
649 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
650 | struct xfrm_tmpl *tmpl, | |
651 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
652 | unsigned short family) | |
653 | { | |
654 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
655 | if (!afinfo) | |
656 | return -1; | |
657 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
658 | xfrm_state_put_afinfo(afinfo); | |
659 | return 0; | |
660 | } | |
661 | ||
221df1ed | 662 | static struct xfrm_state *__xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
edcd5821 | 663 | { |
221df1ed | 664 | unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); |
edcd5821 | 665 | struct xfrm_state *x; |
8f126e37 | 666 | struct hlist_node *entry; |
edcd5821 | 667 | |
221df1ed | 668 | hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) { |
edcd5821 DM |
669 | if (x->props.family != family || |
670 | x->id.spi != spi || | |
671 | x->id.proto != proto) | |
672 | continue; | |
673 | ||
674 | switch (family) { | |
675 | case AF_INET: | |
676 | if (x->id.daddr.a4 != daddr->a4) | |
677 | continue; | |
678 | break; | |
679 | case AF_INET6: | |
680 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
681 | (struct in6_addr *) | |
682 | x->id.daddr.a6)) | |
683 | continue; | |
684 | break; | |
3ff50b79 | 685 | } |
edcd5821 DM |
686 | |
687 | xfrm_state_hold(x); | |
688 | return x; | |
689 | } | |
690 | ||
691 | return NULL; | |
692 | } | |
693 | ||
221df1ed | 694 | 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 | 695 | { |
221df1ed | 696 | unsigned int h = xfrm_src_hash(net, daddr, saddr, family); |
edcd5821 | 697 | struct xfrm_state *x; |
8f126e37 | 698 | struct hlist_node *entry; |
edcd5821 | 699 | |
221df1ed | 700 | hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) { |
edcd5821 DM |
701 | if (x->props.family != family || |
702 | x->id.proto != proto) | |
703 | continue; | |
704 | ||
705 | switch (family) { | |
706 | case AF_INET: | |
707 | if (x->id.daddr.a4 != daddr->a4 || | |
708 | x->props.saddr.a4 != saddr->a4) | |
709 | continue; | |
710 | break; | |
711 | case AF_INET6: | |
712 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
713 | (struct in6_addr *) | |
714 | x->id.daddr.a6) || | |
715 | !ipv6_addr_equal((struct in6_addr *)saddr, | |
716 | (struct in6_addr *) | |
717 | x->props.saddr.a6)) | |
718 | continue; | |
719 | break; | |
3ff50b79 | 720 | } |
edcd5821 DM |
721 | |
722 | xfrm_state_hold(x); | |
723 | return x; | |
724 | } | |
725 | ||
726 | return NULL; | |
727 | } | |
728 | ||
729 | static inline struct xfrm_state * | |
730 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
731 | { | |
221df1ed AD |
732 | struct net *net = xs_net(x); |
733 | ||
edcd5821 | 734 | if (use_spi) |
221df1ed | 735 | return __xfrm_state_lookup(net, &x->id.daddr, x->id.spi, |
edcd5821 DM |
736 | x->id.proto, family); |
737 | else | |
221df1ed | 738 | return __xfrm_state_lookup_byaddr(net, &x->id.daddr, |
edcd5821 DM |
739 | &x->props.saddr, |
740 | x->id.proto, family); | |
741 | } | |
742 | ||
98806f75 | 743 | static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) |
2fab22f2 PM |
744 | { |
745 | if (have_hash_collision && | |
98806f75 AD |
746 | (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && |
747 | net->xfrm.state_num > net->xfrm.state_hmask) | |
748 | schedule_work(&net->xfrm.state_hash_work); | |
2fab22f2 PM |
749 | } |
750 | ||
1da177e4 | 751 | struct xfrm_state * |
a716c119 | 752 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
753 | struct flowi *fl, struct xfrm_tmpl *tmpl, |
754 | struct xfrm_policy *pol, int *err, | |
755 | unsigned short family) | |
756 | { | |
5447c5e4 | 757 | struct net *net = xp_net(pol); |
4bda4f25 | 758 | unsigned int h; |
8f126e37 | 759 | struct hlist_node *entry; |
37b08e34 | 760 | struct xfrm_state *x, *x0, *to_put; |
1da177e4 LT |
761 | int acquire_in_progress = 0; |
762 | int error = 0; | |
763 | struct xfrm_state *best = NULL; | |
a716c119 | 764 | |
37b08e34 DM |
765 | to_put = NULL; |
766 | ||
1da177e4 | 767 | spin_lock_bh(&xfrm_state_lock); |
5447c5e4 AD |
768 | h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, family); |
769 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
1da177e4 LT |
770 | if (x->props.family == family && |
771 | x->props.reqid == tmpl->reqid && | |
fbd9a5b4 | 772 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
1da177e4 LT |
773 | xfrm_state_addr_check(x, daddr, saddr, family) && |
774 | tmpl->mode == x->props.mode && | |
775 | tmpl->id.proto == x->id.proto && | |
776 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) { | |
777 | /* Resolution logic: | |
778 | 1. There is a valid state with matching selector. | |
779 | Done. | |
780 | 2. Valid state with inappropriate selector. Skip. | |
781 | ||
782 | Entering area of "sysdeps". | |
783 | ||
784 | 3. If state is not valid, selector is temporary, | |
785 | it selects only session which triggered | |
786 | previous resolution. Key manager will do | |
787 | something to install a state with proper | |
788 | selector. | |
789 | */ | |
790 | if (x->km.state == XFRM_STATE_VALID) { | |
df9dcb45 | 791 | if ((x->sel.family && !xfrm_selector_match(&x->sel, fl, x->sel.family)) || |
e0d1caa7 | 792 | !security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
793 | continue; |
794 | if (!best || | |
795 | best->km.dying > x->km.dying || | |
796 | (best->km.dying == x->km.dying && | |
797 | best->curlft.add_time < x->curlft.add_time)) | |
798 | best = x; | |
799 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
800 | acquire_in_progress = 1; | |
801 | } else if (x->km.state == XFRM_STATE_ERROR || | |
802 | x->km.state == XFRM_STATE_EXPIRED) { | |
48b8d783 | 803 | if (xfrm_selector_match(&x->sel, fl, x->sel.family) && |
e0d1caa7 | 804 | security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
805 | error = -ESRCH; |
806 | } | |
807 | } | |
808 | } | |
809 | ||
810 | x = best; | |
811 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 812 | if (tmpl->id.spi && |
5447c5e4 | 813 | (x0 = __xfrm_state_lookup(net, daddr, tmpl->id.spi, |
edcd5821 | 814 | tmpl->id.proto, family)) != NULL) { |
37b08e34 | 815 | to_put = x0; |
1da177e4 LT |
816 | error = -EEXIST; |
817 | goto out; | |
818 | } | |
5447c5e4 | 819 | x = xfrm_state_alloc(net); |
1da177e4 LT |
820 | if (x == NULL) { |
821 | error = -ENOMEM; | |
822 | goto out; | |
823 | } | |
824 | /* Initialize temporary selector matching only | |
825 | * to current session. */ | |
826 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
827 | ||
e0d1caa7 VY |
828 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
829 | if (error) { | |
830 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 831 | to_put = x; |
e0d1caa7 VY |
832 | x = NULL; |
833 | goto out; | |
834 | } | |
835 | ||
1da177e4 LT |
836 | if (km_query(x, tmpl, pol) == 0) { |
837 | x->km.state = XFRM_STATE_ACQ; | |
5447c5e4 AD |
838 | list_add(&x->km.all, &net->xfrm.state_all); |
839 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
840 | h = xfrm_src_hash(net, daddr, saddr, family); | |
841 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
1da177e4 | 842 | if (x->id.spi) { |
5447c5e4 AD |
843 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, family); |
844 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 845 | } |
b27aeadb AD |
846 | x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
847 | x->timer.expires = jiffies + net->xfrm.sysctl_acq_expires*HZ; | |
1da177e4 | 848 | add_timer(&x->timer); |
5447c5e4 AD |
849 | net->xfrm.state_num++; |
850 | xfrm_hash_grow_check(net, x->bydst.next != NULL); | |
1da177e4 LT |
851 | } else { |
852 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 853 | to_put = x; |
1da177e4 LT |
854 | x = NULL; |
855 | error = -ESRCH; | |
856 | } | |
857 | } | |
858 | out: | |
859 | if (x) | |
860 | xfrm_state_hold(x); | |
861 | else | |
862 | *err = acquire_in_progress ? -EAGAIN : error; | |
863 | spin_unlock_bh(&xfrm_state_lock); | |
37b08e34 DM |
864 | if (to_put) |
865 | xfrm_state_put(to_put); | |
1da177e4 LT |
866 | return x; |
867 | } | |
868 | ||
628529b6 | 869 | struct xfrm_state * |
5447c5e4 AD |
870 | xfrm_stateonly_find(struct net *net, |
871 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
628529b6 JHS |
872 | unsigned short family, u8 mode, u8 proto, u32 reqid) |
873 | { | |
4bda4f25 | 874 | unsigned int h; |
628529b6 JHS |
875 | struct xfrm_state *rx = NULL, *x = NULL; |
876 | struct hlist_node *entry; | |
877 | ||
878 | spin_lock(&xfrm_state_lock); | |
5447c5e4 AD |
879 | h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
880 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
628529b6 JHS |
881 | if (x->props.family == family && |
882 | x->props.reqid == reqid && | |
883 | !(x->props.flags & XFRM_STATE_WILDRECV) && | |
884 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
885 | mode == x->props.mode && | |
886 | proto == x->id.proto && | |
887 | x->km.state == XFRM_STATE_VALID) { | |
888 | rx = x; | |
889 | break; | |
890 | } | |
891 | } | |
892 | ||
893 | if (rx) | |
894 | xfrm_state_hold(rx); | |
895 | spin_unlock(&xfrm_state_lock); | |
896 | ||
897 | ||
898 | return rx; | |
899 | } | |
900 | EXPORT_SYMBOL(xfrm_stateonly_find); | |
901 | ||
1da177e4 LT |
902 | static void __xfrm_state_insert(struct xfrm_state *x) |
903 | { | |
98806f75 | 904 | struct net *net = xs_net(x); |
a624c108 | 905 | unsigned int h; |
1da177e4 | 906 | |
9d4a706d DM |
907 | x->genid = ++xfrm_state_genid; |
908 | ||
98806f75 | 909 | list_add(&x->km.all, &net->xfrm.state_all); |
4c563f76 | 910 | |
98806f75 | 911 | h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, |
c1969f29 | 912 | x->props.reqid, x->props.family); |
98806f75 | 913 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); |
1da177e4 | 914 | |
98806f75 AD |
915 | h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); |
916 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
1da177e4 | 917 | |
7b4dc360 | 918 | if (x->id.spi) { |
98806f75 | 919 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, |
6c44e6b7 MN |
920 | x->props.family); |
921 | ||
98806f75 | 922 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); |
6c44e6b7 MN |
923 | } |
924 | ||
a47f0ce0 DM |
925 | mod_timer(&x->timer, jiffies + HZ); |
926 | if (x->replay_maxage) | |
927 | mod_timer(&x->rtimer, jiffies + x->replay_maxage); | |
f8cd5488 | 928 | |
98806f75 | 929 | wake_up(&net->xfrm.km_waitq); |
f034b5d4 | 930 | |
98806f75 | 931 | net->xfrm.state_num++; |
f034b5d4 | 932 | |
98806f75 | 933 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
1da177e4 LT |
934 | } |
935 | ||
c7f5ea3a DM |
936 | /* xfrm_state_lock is held */ |
937 | static void __xfrm_state_bump_genids(struct xfrm_state *xnew) | |
938 | { | |
98806f75 | 939 | struct net *net = xs_net(xnew); |
c7f5ea3a DM |
940 | unsigned short family = xnew->props.family; |
941 | u32 reqid = xnew->props.reqid; | |
942 | struct xfrm_state *x; | |
943 | struct hlist_node *entry; | |
944 | unsigned int h; | |
945 | ||
98806f75 AD |
946 | h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); |
947 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
c7f5ea3a DM |
948 | if (x->props.family == family && |
949 | x->props.reqid == reqid && | |
c1969f29 DM |
950 | !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && |
951 | !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) | |
c7f5ea3a DM |
952 | x->genid = xfrm_state_genid; |
953 | } | |
954 | } | |
955 | ||
1da177e4 LT |
956 | void xfrm_state_insert(struct xfrm_state *x) |
957 | { | |
958 | spin_lock_bh(&xfrm_state_lock); | |
c7f5ea3a | 959 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
960 | __xfrm_state_insert(x); |
961 | spin_unlock_bh(&xfrm_state_lock); | |
962 | } | |
963 | EXPORT_SYMBOL(xfrm_state_insert); | |
964 | ||
2770834c | 965 | /* xfrm_state_lock is held */ |
5447c5e4 | 966 | 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 | 967 | { |
5447c5e4 | 968 | unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
8f126e37 | 969 | struct hlist_node *entry; |
2770834c DM |
970 | struct xfrm_state *x; |
971 | ||
5447c5e4 | 972 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { |
2770834c DM |
973 | if (x->props.reqid != reqid || |
974 | x->props.mode != mode || | |
975 | x->props.family != family || | |
976 | x->km.state != XFRM_STATE_ACQ || | |
75e252d9 JL |
977 | x->id.spi != 0 || |
978 | x->id.proto != proto) | |
2770834c DM |
979 | continue; |
980 | ||
981 | switch (family) { | |
982 | case AF_INET: | |
983 | if (x->id.daddr.a4 != daddr->a4 || | |
984 | x->props.saddr.a4 != saddr->a4) | |
985 | continue; | |
986 | break; | |
987 | case AF_INET6: | |
988 | if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6, | |
989 | (struct in6_addr *)daddr) || | |
990 | !ipv6_addr_equal((struct in6_addr *) | |
991 | x->props.saddr.a6, | |
992 | (struct in6_addr *)saddr)) | |
993 | continue; | |
994 | break; | |
3ff50b79 | 995 | } |
2770834c DM |
996 | |
997 | xfrm_state_hold(x); | |
998 | return x; | |
999 | } | |
1000 | ||
1001 | if (!create) | |
1002 | return NULL; | |
1003 | ||
5447c5e4 | 1004 | x = xfrm_state_alloc(net); |
2770834c DM |
1005 | if (likely(x)) { |
1006 | switch (family) { | |
1007 | case AF_INET: | |
1008 | x->sel.daddr.a4 = daddr->a4; | |
1009 | x->sel.saddr.a4 = saddr->a4; | |
1010 | x->sel.prefixlen_d = 32; | |
1011 | x->sel.prefixlen_s = 32; | |
1012 | x->props.saddr.a4 = saddr->a4; | |
1013 | x->id.daddr.a4 = daddr->a4; | |
1014 | break; | |
1015 | ||
1016 | case AF_INET6: | |
1017 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
1018 | (struct in6_addr *)daddr); | |
1019 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
1020 | (struct in6_addr *)saddr); | |
1021 | x->sel.prefixlen_d = 128; | |
1022 | x->sel.prefixlen_s = 128; | |
1023 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
1024 | (struct in6_addr *)saddr); | |
1025 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
1026 | (struct in6_addr *)daddr); | |
1027 | break; | |
3ff50b79 | 1028 | } |
2770834c DM |
1029 | |
1030 | x->km.state = XFRM_STATE_ACQ; | |
1031 | x->id.proto = proto; | |
1032 | x->props.family = family; | |
1033 | x->props.mode = mode; | |
1034 | x->props.reqid = reqid; | |
b27aeadb | 1035 | x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
2770834c | 1036 | xfrm_state_hold(x); |
b27aeadb | 1037 | x->timer.expires = jiffies + net->xfrm.sysctl_acq_expires*HZ; |
2770834c | 1038 | add_timer(&x->timer); |
5447c5e4 AD |
1039 | list_add(&x->km.all, &net->xfrm.state_all); |
1040 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
1041 | h = xfrm_src_hash(net, daddr, saddr, family); | |
1042 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
918049f0 | 1043 | |
5447c5e4 | 1044 | net->xfrm.state_num++; |
918049f0 | 1045 | |
5447c5e4 | 1046 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
2770834c DM |
1047 | } |
1048 | ||
1049 | return x; | |
1050 | } | |
1051 | ||
5447c5e4 | 1052 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq); |
1da177e4 LT |
1053 | |
1054 | int xfrm_state_add(struct xfrm_state *x) | |
1055 | { | |
5447c5e4 | 1056 | struct net *net = xs_net(x); |
37b08e34 | 1057 | struct xfrm_state *x1, *to_put; |
1da177e4 LT |
1058 | int family; |
1059 | int err; | |
eb2971b6 | 1060 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
1061 | |
1062 | family = x->props.family; | |
1da177e4 | 1063 | |
37b08e34 DM |
1064 | to_put = NULL; |
1065 | ||
1da177e4 LT |
1066 | spin_lock_bh(&xfrm_state_lock); |
1067 | ||
edcd5821 | 1068 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 | 1069 | if (x1) { |
37b08e34 | 1070 | to_put = x1; |
1da177e4 LT |
1071 | x1 = NULL; |
1072 | err = -EEXIST; | |
1073 | goto out; | |
1074 | } | |
1075 | ||
eb2971b6 | 1076 | if (use_spi && x->km.seq) { |
5447c5e4 | 1077 | x1 = __xfrm_find_acq_byseq(net, x->km.seq); |
75e252d9 JL |
1078 | if (x1 && ((x1->id.proto != x->id.proto) || |
1079 | xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) { | |
37b08e34 | 1080 | to_put = x1; |
1da177e4 LT |
1081 | x1 = NULL; |
1082 | } | |
1083 | } | |
1084 | ||
eb2971b6 | 1085 | if (use_spi && !x1) |
5447c5e4 | 1086 | x1 = __find_acq_core(net, family, x->props.mode, x->props.reqid, |
2770834c DM |
1087 | x->id.proto, |
1088 | &x->id.daddr, &x->props.saddr, 0); | |
1da177e4 | 1089 | |
c7f5ea3a | 1090 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
1091 | __xfrm_state_insert(x); |
1092 | err = 0; | |
1093 | ||
1094 | out: | |
1095 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
1096 | |
1097 | if (x1) { | |
1098 | xfrm_state_delete(x1); | |
1099 | xfrm_state_put(x1); | |
1100 | } | |
1101 | ||
37b08e34 DM |
1102 | if (to_put) |
1103 | xfrm_state_put(to_put); | |
1104 | ||
1da177e4 LT |
1105 | return err; |
1106 | } | |
1107 | EXPORT_SYMBOL(xfrm_state_add); | |
1108 | ||
80c9abaa | 1109 | #ifdef CONFIG_XFRM_MIGRATE |
6666351d | 1110 | static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) |
80c9abaa | 1111 | { |
98806f75 | 1112 | struct net *net = xs_net(orig); |
80c9abaa | 1113 | int err = -ENOMEM; |
98806f75 | 1114 | struct xfrm_state *x = xfrm_state_alloc(net); |
80c9abaa SS |
1115 | if (!x) |
1116 | goto error; | |
1117 | ||
1118 | memcpy(&x->id, &orig->id, sizeof(x->id)); | |
1119 | memcpy(&x->sel, &orig->sel, sizeof(x->sel)); | |
1120 | memcpy(&x->lft, &orig->lft, sizeof(x->lft)); | |
1121 | x->props.mode = orig->props.mode; | |
1122 | x->props.replay_window = orig->props.replay_window; | |
1123 | x->props.reqid = orig->props.reqid; | |
1124 | x->props.family = orig->props.family; | |
1125 | x->props.saddr = orig->props.saddr; | |
1126 | ||
1127 | if (orig->aalg) { | |
1128 | x->aalg = xfrm_algo_clone(orig->aalg); | |
1129 | if (!x->aalg) | |
1130 | goto error; | |
1131 | } | |
1132 | x->props.aalgo = orig->props.aalgo; | |
1133 | ||
1134 | if (orig->ealg) { | |
1135 | x->ealg = xfrm_algo_clone(orig->ealg); | |
1136 | if (!x->ealg) | |
1137 | goto error; | |
1138 | } | |
1139 | x->props.ealgo = orig->props.ealgo; | |
1140 | ||
1141 | if (orig->calg) { | |
1142 | x->calg = xfrm_algo_clone(orig->calg); | |
1143 | if (!x->calg) | |
1144 | goto error; | |
1145 | } | |
1146 | x->props.calgo = orig->props.calgo; | |
1147 | ||
a716c119 | 1148 | if (orig->encap) { |
80c9abaa SS |
1149 | x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); |
1150 | if (!x->encap) | |
1151 | goto error; | |
1152 | } | |
1153 | ||
1154 | if (orig->coaddr) { | |
1155 | x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), | |
1156 | GFP_KERNEL); | |
1157 | if (!x->coaddr) | |
1158 | goto error; | |
1159 | } | |
1160 | ||
1161 | err = xfrm_init_state(x); | |
1162 | if (err) | |
1163 | goto error; | |
1164 | ||
1165 | x->props.flags = orig->props.flags; | |
1166 | ||
1167 | x->curlft.add_time = orig->curlft.add_time; | |
1168 | x->km.state = orig->km.state; | |
1169 | x->km.seq = orig->km.seq; | |
1170 | ||
1171 | return x; | |
1172 | ||
1173 | error: | |
1174 | if (errp) | |
1175 | *errp = err; | |
1176 | if (x) { | |
1177 | kfree(x->aalg); | |
1178 | kfree(x->ealg); | |
1179 | kfree(x->calg); | |
1180 | kfree(x->encap); | |
1181 | kfree(x->coaddr); | |
1182 | } | |
1183 | kfree(x); | |
1184 | return NULL; | |
1185 | } | |
80c9abaa SS |
1186 | |
1187 | /* xfrm_state_lock is held */ | |
1188 | struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) | |
1189 | { | |
1190 | unsigned int h; | |
1191 | struct xfrm_state *x; | |
1192 | struct hlist_node *entry; | |
1193 | ||
1194 | if (m->reqid) { | |
64d0cd00 | 1195 | h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1196 | m->reqid, m->old_family); |
73d189dc | 1197 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { |
80c9abaa SS |
1198 | if (x->props.mode != m->mode || |
1199 | x->id.proto != m->proto) | |
1200 | continue; | |
1201 | if (m->reqid && x->props.reqid != m->reqid) | |
1202 | continue; | |
1203 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1204 | m->old_family) || | |
1205 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1206 | m->old_family)) | |
1207 | continue; | |
1208 | xfrm_state_hold(x); | |
1209 | return x; | |
1210 | } | |
1211 | } else { | |
64d0cd00 | 1212 | h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1213 | m->old_family); |
d320bbb3 | 1214 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) { |
80c9abaa SS |
1215 | if (x->props.mode != m->mode || |
1216 | x->id.proto != m->proto) | |
1217 | continue; | |
1218 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1219 | m->old_family) || | |
1220 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1221 | m->old_family)) | |
1222 | continue; | |
1223 | xfrm_state_hold(x); | |
1224 | return x; | |
1225 | } | |
1226 | } | |
1227 | ||
a716c119 | 1228 | return NULL; |
80c9abaa SS |
1229 | } |
1230 | EXPORT_SYMBOL(xfrm_migrate_state_find); | |
1231 | ||
1232 | struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, | |
1233 | struct xfrm_migrate *m) | |
1234 | { | |
1235 | struct xfrm_state *xc; | |
1236 | int err; | |
1237 | ||
1238 | xc = xfrm_state_clone(x, &err); | |
1239 | if (!xc) | |
1240 | return NULL; | |
1241 | ||
1242 | memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); | |
1243 | memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); | |
1244 | ||
1245 | /* add state */ | |
1246 | if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) { | |
1247 | /* a care is needed when the destination address of the | |
1248 | state is to be updated as it is a part of triplet */ | |
1249 | xfrm_state_insert(xc); | |
1250 | } else { | |
1251 | if ((err = xfrm_state_add(xc)) < 0) | |
1252 | goto error; | |
1253 | } | |
1254 | ||
1255 | return xc; | |
1256 | error: | |
1257 | kfree(xc); | |
1258 | return NULL; | |
1259 | } | |
1260 | EXPORT_SYMBOL(xfrm_state_migrate); | |
1261 | #endif | |
1262 | ||
1da177e4 LT |
1263 | int xfrm_state_update(struct xfrm_state *x) |
1264 | { | |
37b08e34 | 1265 | struct xfrm_state *x1, *to_put; |
1da177e4 | 1266 | int err; |
eb2971b6 | 1267 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 1268 | |
37b08e34 DM |
1269 | to_put = NULL; |
1270 | ||
1da177e4 | 1271 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 1272 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
1273 | |
1274 | err = -ESRCH; | |
1275 | if (!x1) | |
1276 | goto out; | |
1277 | ||
1278 | if (xfrm_state_kern(x1)) { | |
37b08e34 | 1279 | to_put = x1; |
1da177e4 LT |
1280 | err = -EEXIST; |
1281 | goto out; | |
1282 | } | |
1283 | ||
1284 | if (x1->km.state == XFRM_STATE_ACQ) { | |
1285 | __xfrm_state_insert(x); | |
1286 | x = NULL; | |
1287 | } | |
1288 | err = 0; | |
1289 | ||
1290 | out: | |
1291 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 | 1292 | |
37b08e34 DM |
1293 | if (to_put) |
1294 | xfrm_state_put(to_put); | |
1295 | ||
1da177e4 LT |
1296 | if (err) |
1297 | return err; | |
1298 | ||
1299 | if (!x) { | |
1300 | xfrm_state_delete(x1); | |
1301 | xfrm_state_put(x1); | |
1302 | return 0; | |
1303 | } | |
1304 | ||
1305 | err = -EINVAL; | |
1306 | spin_lock_bh(&x1->lock); | |
1307 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
1308 | if (x->encap && x1->encap) | |
1309 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
1310 | if (x->coaddr && x1->coaddr) { |
1311 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
1312 | } | |
1313 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
1314 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
1315 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
1316 | x1->km.dying = 0; | |
1317 | ||
a47f0ce0 | 1318 | mod_timer(&x1->timer, jiffies + HZ); |
1da177e4 LT |
1319 | if (x1->curlft.use_time) |
1320 | xfrm_state_check_expire(x1); | |
1321 | ||
1322 | err = 0; | |
1323 | } | |
1324 | spin_unlock_bh(&x1->lock); | |
1325 | ||
1326 | xfrm_state_put(x1); | |
1327 | ||
1328 | return err; | |
1329 | } | |
1330 | EXPORT_SYMBOL(xfrm_state_update); | |
1331 | ||
1332 | int xfrm_state_check_expire(struct xfrm_state *x) | |
1333 | { | |
1334 | if (!x->curlft.use_time) | |
9d729f72 | 1335 | x->curlft.use_time = get_seconds(); |
1da177e4 LT |
1336 | |
1337 | if (x->km.state != XFRM_STATE_VALID) | |
1338 | return -EINVAL; | |
1339 | ||
1340 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
1341 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 1342 | x->km.state = XFRM_STATE_EXPIRED; |
a47f0ce0 | 1343 | mod_timer(&x->timer, jiffies); |
1da177e4 LT |
1344 | return -EINVAL; |
1345 | } | |
1346 | ||
1347 | if (!x->km.dying && | |
1348 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
1349 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
1350 | x->km.dying = 1; | |
53bc6b4d | 1351 | km_state_expired(x, 0, 0); |
4666faab | 1352 | } |
1da177e4 LT |
1353 | return 0; |
1354 | } | |
1355 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
1356 | ||
1da177e4 | 1357 | struct xfrm_state * |
221df1ed | 1358 | xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, |
1da177e4 LT |
1359 | unsigned short family) |
1360 | { | |
1361 | struct xfrm_state *x; | |
1da177e4 LT |
1362 | |
1363 | spin_lock_bh(&xfrm_state_lock); | |
221df1ed | 1364 | x = __xfrm_state_lookup(net, daddr, spi, proto, family); |
1da177e4 | 1365 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
1366 | return x; |
1367 | } | |
1368 | EXPORT_SYMBOL(xfrm_state_lookup); | |
1369 | ||
1370 | struct xfrm_state * | |
221df1ed AD |
1371 | xfrm_state_lookup_byaddr(struct net *net, |
1372 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
eb2971b6 MN |
1373 | u8 proto, unsigned short family) |
1374 | { | |
1375 | struct xfrm_state *x; | |
eb2971b6 MN |
1376 | |
1377 | spin_lock_bh(&xfrm_state_lock); | |
221df1ed | 1378 | x = __xfrm_state_lookup_byaddr(net, daddr, saddr, proto, family); |
eb2971b6 | 1379 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
1380 | return x; |
1381 | } | |
1382 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
1383 | ||
1384 | struct xfrm_state * | |
5447c5e4 | 1385 | xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto, |
a716c119 | 1386 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
1387 | int create, unsigned short family) |
1388 | { | |
1389 | struct xfrm_state *x; | |
1da177e4 LT |
1390 | |
1391 | spin_lock_bh(&xfrm_state_lock); | |
5447c5e4 | 1392 | x = __find_acq_core(net, family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 1393 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 1394 | |
1da177e4 LT |
1395 | return x; |
1396 | } | |
1397 | EXPORT_SYMBOL(xfrm_find_acq); | |
1398 | ||
41a49cc3 MN |
1399 | #ifdef CONFIG_XFRM_SUB_POLICY |
1400 | int | |
1401 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
1402 | unsigned short family) | |
1403 | { | |
1404 | int err = 0; | |
1405 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1406 | if (!afinfo) | |
1407 | return -EAFNOSUPPORT; | |
1408 | ||
1409 | spin_lock_bh(&xfrm_state_lock); | |
1410 | if (afinfo->tmpl_sort) | |
1411 | err = afinfo->tmpl_sort(dst, src, n); | |
1412 | spin_unlock_bh(&xfrm_state_lock); | |
1413 | xfrm_state_put_afinfo(afinfo); | |
1414 | return err; | |
1415 | } | |
1416 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
1417 | ||
1418 | int | |
1419 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
1420 | unsigned short family) | |
1421 | { | |
1422 | int err = 0; | |
1423 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1424 | if (!afinfo) | |
1425 | return -EAFNOSUPPORT; | |
1426 | ||
1427 | spin_lock_bh(&xfrm_state_lock); | |
1428 | if (afinfo->state_sort) | |
1429 | err = afinfo->state_sort(dst, src, n); | |
1430 | spin_unlock_bh(&xfrm_state_lock); | |
1431 | xfrm_state_put_afinfo(afinfo); | |
1432 | return err; | |
1433 | } | |
1434 | EXPORT_SYMBOL(xfrm_state_sort); | |
1435 | #endif | |
1436 | ||
1da177e4 LT |
1437 | /* Silly enough, but I'm lazy to build resolution list */ |
1438 | ||
5447c5e4 | 1439 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq) |
1da177e4 LT |
1440 | { |
1441 | int i; | |
1da177e4 | 1442 | |
5447c5e4 | 1443 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
1444 | struct hlist_node *entry; |
1445 | struct xfrm_state *x; | |
1446 | ||
5447c5e4 | 1447 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
8f126e37 DM |
1448 | if (x->km.seq == seq && |
1449 | x->km.state == XFRM_STATE_ACQ) { | |
1da177e4 LT |
1450 | xfrm_state_hold(x); |
1451 | return x; | |
1452 | } | |
1453 | } | |
1454 | } | |
1455 | return NULL; | |
1456 | } | |
1457 | ||
5447c5e4 | 1458 | struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq) |
1da177e4 LT |
1459 | { |
1460 | struct xfrm_state *x; | |
1461 | ||
1462 | spin_lock_bh(&xfrm_state_lock); | |
5447c5e4 | 1463 | x = __xfrm_find_acq_byseq(net, seq); |
1da177e4 LT |
1464 | spin_unlock_bh(&xfrm_state_lock); |
1465 | return x; | |
1466 | } | |
1467 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1468 | ||
1469 | u32 xfrm_get_acqseq(void) | |
1470 | { | |
1471 | u32 res; | |
1472 | static u32 acqseq; | |
1473 | static DEFINE_SPINLOCK(acqseq_lock); | |
1474 | ||
1475 | spin_lock_bh(&acqseq_lock); | |
1476 | res = (++acqseq ? : ++acqseq); | |
1477 | spin_unlock_bh(&acqseq_lock); | |
1478 | return res; | |
1479 | } | |
1480 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1481 | ||
658b219e | 1482 | int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) |
1da177e4 | 1483 | { |
221df1ed | 1484 | struct net *net = xs_net(x); |
f034b5d4 | 1485 | unsigned int h; |
1da177e4 | 1486 | struct xfrm_state *x0; |
658b219e HX |
1487 | int err = -ENOENT; |
1488 | __be32 minspi = htonl(low); | |
1489 | __be32 maxspi = htonl(high); | |
1da177e4 | 1490 | |
658b219e HX |
1491 | spin_lock_bh(&x->lock); |
1492 | if (x->km.state == XFRM_STATE_DEAD) | |
1493 | goto unlock; | |
1494 | ||
1495 | err = 0; | |
1da177e4 | 1496 | if (x->id.spi) |
658b219e HX |
1497 | goto unlock; |
1498 | ||
1499 | err = -ENOENT; | |
1da177e4 LT |
1500 | |
1501 | if (minspi == maxspi) { | |
221df1ed | 1502 | x0 = xfrm_state_lookup(net, &x->id.daddr, minspi, x->id.proto, x->props.family); |
1da177e4 LT |
1503 | if (x0) { |
1504 | xfrm_state_put(x0); | |
658b219e | 1505 | goto unlock; |
1da177e4 LT |
1506 | } |
1507 | x->id.spi = minspi; | |
1508 | } else { | |
1509 | u32 spi = 0; | |
26977b4e AV |
1510 | for (h=0; h<high-low+1; h++) { |
1511 | spi = low + net_random()%(high-low+1); | |
221df1ed | 1512 | x0 = xfrm_state_lookup(net, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
1da177e4 LT |
1513 | if (x0 == NULL) { |
1514 | x->id.spi = htonl(spi); | |
1515 | break; | |
1516 | } | |
1517 | xfrm_state_put(x0); | |
1518 | } | |
1519 | } | |
1520 | if (x->id.spi) { | |
1521 | spin_lock_bh(&xfrm_state_lock); | |
12604d8a AD |
1522 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); |
1523 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 1524 | spin_unlock_bh(&xfrm_state_lock); |
658b219e HX |
1525 | |
1526 | err = 0; | |
1da177e4 | 1527 | } |
658b219e HX |
1528 | |
1529 | unlock: | |
1530 | spin_unlock_bh(&x->lock); | |
1531 | ||
1532 | return err; | |
1da177e4 LT |
1533 | } |
1534 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1535 | ||
284fa7da | 1536 | int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, |
4c563f76 | 1537 | int (*func)(struct xfrm_state *, int, void*), |
1da177e4 LT |
1538 | void *data) |
1539 | { | |
12a169e7 HX |
1540 | struct xfrm_state *state; |
1541 | struct xfrm_state_walk *x; | |
1da177e4 LT |
1542 | int err = 0; |
1543 | ||
12a169e7 | 1544 | if (walk->seq != 0 && list_empty(&walk->all)) |
4c563f76 TT |
1545 | return 0; |
1546 | ||
1da177e4 | 1547 | spin_lock_bh(&xfrm_state_lock); |
12a169e7 | 1548 | if (list_empty(&walk->all)) |
284fa7da | 1549 | x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); |
12a169e7 HX |
1550 | else |
1551 | x = list_entry(&walk->all, struct xfrm_state_walk, all); | |
284fa7da | 1552 | list_for_each_entry_from(x, &net->xfrm.state_all, all) { |
12a169e7 | 1553 | if (x->state == XFRM_STATE_DEAD) |
4c563f76 | 1554 | continue; |
12a169e7 HX |
1555 | state = container_of(x, struct xfrm_state, km); |
1556 | if (!xfrm_id_proto_match(state->id.proto, walk->proto)) | |
4c563f76 | 1557 | continue; |
12a169e7 HX |
1558 | err = func(state, walk->seq, data); |
1559 | if (err) { | |
1560 | list_move_tail(&walk->all, &x->all); | |
1561 | goto out; | |
1da177e4 | 1562 | } |
12a169e7 | 1563 | walk->seq++; |
1da177e4 | 1564 | } |
12a169e7 | 1565 | if (walk->seq == 0) { |
1da177e4 LT |
1566 | err = -ENOENT; |
1567 | goto out; | |
1568 | } | |
12a169e7 | 1569 | list_del_init(&walk->all); |
1da177e4 LT |
1570 | out: |
1571 | spin_unlock_bh(&xfrm_state_lock); | |
1572 | return err; | |
1573 | } | |
1574 | EXPORT_SYMBOL(xfrm_state_walk); | |
1575 | ||
5c182458 HX |
1576 | void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) |
1577 | { | |
12a169e7 | 1578 | INIT_LIST_HEAD(&walk->all); |
5c182458 | 1579 | walk->proto = proto; |
12a169e7 HX |
1580 | walk->state = XFRM_STATE_DEAD; |
1581 | walk->seq = 0; | |
5c182458 HX |
1582 | } |
1583 | EXPORT_SYMBOL(xfrm_state_walk_init); | |
1584 | ||
abb81c4f HX |
1585 | void xfrm_state_walk_done(struct xfrm_state_walk *walk) |
1586 | { | |
12a169e7 | 1587 | if (list_empty(&walk->all)) |
5c182458 | 1588 | return; |
5c182458 | 1589 | |
12a169e7 HX |
1590 | spin_lock_bh(&xfrm_state_lock); |
1591 | list_del(&walk->all); | |
1592 | spin_lock_bh(&xfrm_state_lock); | |
abb81c4f HX |
1593 | } |
1594 | EXPORT_SYMBOL(xfrm_state_walk_done); | |
1595 | ||
f8cd5488 JHS |
1596 | |
1597 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
1598 | { | |
1599 | struct km_event c; | |
1600 | /* we send notify messages in case | |
1601 | * 1. we updated on of the sequence numbers, and the seqno difference | |
1602 | * is at least x->replay_maxdiff, in this case we also update the | |
1603 | * timeout of our timer function | |
1604 | * 2. if x->replay_maxage has elapsed since last update, | |
1605 | * and there were changes | |
1606 | * | |
1607 | * The state structure must be locked! | |
1608 | */ | |
1609 | ||
1610 | switch (event) { | |
1611 | case XFRM_REPLAY_UPDATE: | |
1612 | if (x->replay_maxdiff && | |
1613 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
1614 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
1615 | if (x->xflags & XFRM_TIME_DEFER) | |
1616 | event = XFRM_REPLAY_TIMEOUT; | |
1617 | else | |
1618 | return; | |
1619 | } | |
f8cd5488 JHS |
1620 | |
1621 | break; | |
1622 | ||
1623 | case XFRM_REPLAY_TIMEOUT: | |
1624 | if ((x->replay.seq == x->preplay.seq) && | |
1625 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1626 | (x->replay.oseq == x->preplay.oseq)) { |
1627 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1628 | return; |
2717096a | 1629 | } |
f8cd5488 JHS |
1630 | |
1631 | break; | |
1632 | } | |
1633 | ||
1634 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1635 | c.event = XFRM_MSG_NEWAE; | |
1636 | c.data.aevent = event; | |
1637 | km_state_notify(x, &c); | |
1638 | ||
f8cd5488 | 1639 | if (x->replay_maxage && |
a47f0ce0 | 1640 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
2717096a | 1641 | x->xflags &= ~XFRM_TIME_DEFER; |
f8cd5488 JHS |
1642 | } |
1643 | ||
1644 | static void xfrm_replay_timer_handler(unsigned long data) | |
1645 | { | |
1646 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1647 | ||
1648 | spin_lock(&x->lock); | |
1649 | ||
2717096a | 1650 | if (x->km.state == XFRM_STATE_VALID) { |
a6483b79 | 1651 | if (xfrm_aevent_is_on(xs_net(x))) |
2717096a JHS |
1652 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); |
1653 | else | |
1654 | x->xflags |= XFRM_TIME_DEFER; | |
1655 | } | |
f8cd5488 JHS |
1656 | |
1657 | spin_unlock(&x->lock); | |
1658 | } | |
1659 | ||
afeb14b4 PM |
1660 | int xfrm_replay_check(struct xfrm_state *x, |
1661 | struct sk_buff *skb, __be32 net_seq) | |
1da177e4 LT |
1662 | { |
1663 | u32 diff; | |
a252cc23 | 1664 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1665 | |
1666 | if (unlikely(seq == 0)) | |
afeb14b4 | 1667 | goto err; |
1da177e4 LT |
1668 | |
1669 | if (likely(seq > x->replay.seq)) | |
1670 | return 0; | |
1671 | ||
1672 | diff = x->replay.seq - seq; | |
4c4d51a7 HX |
1673 | if (diff >= min_t(unsigned int, x->props.replay_window, |
1674 | sizeof(x->replay.bitmap) * 8)) { | |
1da177e4 | 1675 | x->stats.replay_window++; |
afeb14b4 | 1676 | goto err; |
1da177e4 LT |
1677 | } |
1678 | ||
1679 | if (x->replay.bitmap & (1U << diff)) { | |
1680 | x->stats.replay++; | |
afeb14b4 | 1681 | goto err; |
1da177e4 LT |
1682 | } |
1683 | return 0; | |
afeb14b4 PM |
1684 | |
1685 | err: | |
1686 | xfrm_audit_state_replay(x, skb, net_seq); | |
1687 | return -EINVAL; | |
1da177e4 | 1688 | } |
1da177e4 | 1689 | |
61f4627b | 1690 | void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq) |
1da177e4 LT |
1691 | { |
1692 | u32 diff; | |
61f4627b | 1693 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1694 | |
1695 | if (seq > x->replay.seq) { | |
1696 | diff = seq - x->replay.seq; | |
1697 | if (diff < x->props.replay_window) | |
1698 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1699 | else | |
1700 | x->replay.bitmap = 1; | |
1701 | x->replay.seq = seq; | |
1702 | } else { | |
1703 | diff = x->replay.seq - seq; | |
1704 | x->replay.bitmap |= (1U << diff); | |
1705 | } | |
f8cd5488 | 1706 | |
a6483b79 | 1707 | if (xfrm_aevent_is_on(xs_net(x))) |
f8cd5488 | 1708 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); |
1da177e4 | 1709 | } |
1da177e4 | 1710 | |
df01812e | 1711 | static LIST_HEAD(xfrm_km_list); |
1da177e4 LT |
1712 | static DEFINE_RWLOCK(xfrm_km_lock); |
1713 | ||
26b15dad | 1714 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1715 | { |
1716 | struct xfrm_mgr *km; | |
1717 | ||
26b15dad JHS |
1718 | read_lock(&xfrm_km_lock); |
1719 | list_for_each_entry(km, &xfrm_km_list, list) | |
1720 | if (km->notify_policy) | |
1721 | km->notify_policy(xp, dir, c); | |
1722 | read_unlock(&xfrm_km_lock); | |
1723 | } | |
1da177e4 | 1724 | |
26b15dad JHS |
1725 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
1726 | { | |
1727 | struct xfrm_mgr *km; | |
1da177e4 LT |
1728 | read_lock(&xfrm_km_lock); |
1729 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1730 | if (km->notify) |
1731 | km->notify(x, c); | |
1da177e4 | 1732 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1733 | } |
1734 | ||
1735 | EXPORT_SYMBOL(km_policy_notify); | |
1736 | EXPORT_SYMBOL(km_state_notify); | |
1737 | ||
53bc6b4d | 1738 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad | 1739 | { |
98806f75 | 1740 | struct net *net = xs_net(x); |
26b15dad JHS |
1741 | struct km_event c; |
1742 | ||
bf08867f | 1743 | c.data.hard = hard; |
53bc6b4d | 1744 | c.pid = pid; |
f60f6b8f | 1745 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1746 | km_state_notify(x, &c); |
1da177e4 LT |
1747 | |
1748 | if (hard) | |
98806f75 | 1749 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
1750 | } |
1751 | ||
53bc6b4d | 1752 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1753 | /* |
1754 | * We send to all registered managers regardless of failure | |
1755 | * We are happy with one success | |
1756 | */ | |
980ebd25 | 1757 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1758 | { |
26b15dad | 1759 | int err = -EINVAL, acqret; |
1da177e4 LT |
1760 | struct xfrm_mgr *km; |
1761 | ||
1762 | read_lock(&xfrm_km_lock); | |
1763 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1764 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1765 | if (!acqret) | |
1766 | err = acqret; | |
1da177e4 LT |
1767 | } |
1768 | read_unlock(&xfrm_km_lock); | |
1769 | return err; | |
1770 | } | |
980ebd25 | 1771 | EXPORT_SYMBOL(km_query); |
1da177e4 | 1772 | |
5d36b180 | 1773 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) |
1da177e4 LT |
1774 | { |
1775 | int err = -EINVAL; | |
1776 | struct xfrm_mgr *km; | |
1777 | ||
1778 | read_lock(&xfrm_km_lock); | |
1779 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1780 | if (km->new_mapping) | |
1781 | err = km->new_mapping(x, ipaddr, sport); | |
1782 | if (!err) | |
1783 | break; | |
1784 | } | |
1785 | read_unlock(&xfrm_km_lock); | |
1786 | return err; | |
1787 | } | |
1788 | EXPORT_SYMBOL(km_new_mapping); | |
1789 | ||
6c5c8ca7 | 1790 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1791 | { |
98806f75 | 1792 | struct net *net = xp_net(pol); |
26b15dad | 1793 | struct km_event c; |
1da177e4 | 1794 | |
bf08867f | 1795 | c.data.hard = hard; |
6c5c8ca7 | 1796 | c.pid = pid; |
f60f6b8f | 1797 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1798 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1799 | |
1800 | if (hard) | |
98806f75 | 1801 | wake_up(&net->xfrm.km_waitq); |
1da177e4 | 1802 | } |
a70fcb0b | 1803 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1804 | |
2d60abc2 | 1805 | #ifdef CONFIG_XFRM_MIGRATE |
80c9abaa | 1806 | int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 AE |
1807 | struct xfrm_migrate *m, int num_migrate, |
1808 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
1809 | { |
1810 | int err = -EINVAL; | |
1811 | int ret; | |
1812 | struct xfrm_mgr *km; | |
1813 | ||
1814 | read_lock(&xfrm_km_lock); | |
1815 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1816 | if (km->migrate) { | |
13c1d189 | 1817 | ret = km->migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
1818 | if (!ret) |
1819 | err = ret; | |
1820 | } | |
1821 | } | |
1822 | read_unlock(&xfrm_km_lock); | |
1823 | return err; | |
1824 | } | |
1825 | EXPORT_SYMBOL(km_migrate); | |
2d60abc2 | 1826 | #endif |
80c9abaa | 1827 | |
db983c11 | 1828 | int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
97a64b45 MN |
1829 | { |
1830 | int err = -EINVAL; | |
1831 | int ret; | |
1832 | struct xfrm_mgr *km; | |
1833 | ||
1834 | read_lock(&xfrm_km_lock); | |
1835 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1836 | if (km->report) { | |
db983c11 | 1837 | ret = km->report(net, proto, sel, addr); |
97a64b45 MN |
1838 | if (!ret) |
1839 | err = ret; | |
1840 | } | |
1841 | } | |
1842 | read_unlock(&xfrm_km_lock); | |
1843 | return err; | |
1844 | } | |
1845 | EXPORT_SYMBOL(km_report); | |
1846 | ||
1da177e4 LT |
1847 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1848 | { | |
1849 | int err; | |
1850 | u8 *data; | |
1851 | struct xfrm_mgr *km; | |
1852 | struct xfrm_policy *pol = NULL; | |
1853 | ||
1854 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1855 | return -EMSGSIZE; | |
1856 | ||
1857 | data = kmalloc(optlen, GFP_KERNEL); | |
1858 | if (!data) | |
1859 | return -ENOMEM; | |
1860 | ||
1861 | err = -EFAULT; | |
1862 | if (copy_from_user(data, optval, optlen)) | |
1863 | goto out; | |
1864 | ||
1865 | err = -EINVAL; | |
1866 | read_lock(&xfrm_km_lock); | |
1867 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1868 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1869 | optlen, &err); |
1870 | if (err >= 0) | |
1871 | break; | |
1872 | } | |
1873 | read_unlock(&xfrm_km_lock); | |
1874 | ||
1875 | if (err >= 0) { | |
1876 | xfrm_sk_policy_insert(sk, err, pol); | |
1877 | xfrm_pol_put(pol); | |
1878 | err = 0; | |
1879 | } | |
1880 | ||
1881 | out: | |
1882 | kfree(data); | |
1883 | return err; | |
1884 | } | |
1885 | EXPORT_SYMBOL(xfrm_user_policy); | |
1886 | ||
1887 | int xfrm_register_km(struct xfrm_mgr *km) | |
1888 | { | |
1889 | write_lock_bh(&xfrm_km_lock); | |
1890 | list_add_tail(&km->list, &xfrm_km_list); | |
1891 | write_unlock_bh(&xfrm_km_lock); | |
1892 | return 0; | |
1893 | } | |
1894 | EXPORT_SYMBOL(xfrm_register_km); | |
1895 | ||
1896 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1897 | { | |
1898 | write_lock_bh(&xfrm_km_lock); | |
1899 | list_del(&km->list); | |
1900 | write_unlock_bh(&xfrm_km_lock); | |
1901 | return 0; | |
1902 | } | |
1903 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1904 | ||
1905 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1906 | { | |
1907 | int err = 0; | |
1908 | if (unlikely(afinfo == NULL)) | |
1909 | return -EINVAL; | |
1910 | if (unlikely(afinfo->family >= NPROTO)) | |
1911 | return -EAFNOSUPPORT; | |
f3111502 | 1912 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1913 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1914 | err = -ENOBUFS; | |
edcd5821 | 1915 | else |
1da177e4 | 1916 | xfrm_state_afinfo[afinfo->family] = afinfo; |
f3111502 | 1917 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1918 | return err; |
1919 | } | |
1920 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1921 | ||
1922 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1923 | { | |
1924 | int err = 0; | |
1925 | if (unlikely(afinfo == NULL)) | |
1926 | return -EINVAL; | |
1927 | if (unlikely(afinfo->family >= NPROTO)) | |
1928 | return -EAFNOSUPPORT; | |
f3111502 | 1929 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1930 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1931 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1932 | err = -EINVAL; | |
edcd5821 | 1933 | else |
1da177e4 | 1934 | xfrm_state_afinfo[afinfo->family] = NULL; |
1da177e4 | 1935 | } |
f3111502 | 1936 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1937 | return err; |
1938 | } | |
1939 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1940 | ||
17c2a42a | 1941 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) |
1da177e4 LT |
1942 | { |
1943 | struct xfrm_state_afinfo *afinfo; | |
1944 | if (unlikely(family >= NPROTO)) | |
1945 | return NULL; | |
1946 | read_lock(&xfrm_state_afinfo_lock); | |
1947 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1948 | if (unlikely(!afinfo)) |
1949 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1950 | return afinfo; |
1951 | } | |
1952 | ||
17c2a42a | 1953 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) |
9a429c49 | 1954 | __releases(xfrm_state_afinfo_lock) |
1da177e4 | 1955 | { |
546be240 | 1956 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1957 | } |
1958 | ||
1959 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1960 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1961 | { | |
1962 | if (x->tunnel) { | |
1963 | struct xfrm_state *t = x->tunnel; | |
1964 | ||
1965 | if (atomic_read(&t->tunnel_users) == 2) | |
1966 | xfrm_state_delete(t); | |
1967 | atomic_dec(&t->tunnel_users); | |
1968 | xfrm_state_put(t); | |
1969 | x->tunnel = NULL; | |
1970 | } | |
1971 | } | |
1972 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1973 | ||
1974 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) | |
1975 | { | |
c5c25238 | 1976 | int res; |
1da177e4 | 1977 | |
c5c25238 PM |
1978 | spin_lock_bh(&x->lock); |
1979 | if (x->km.state == XFRM_STATE_VALID && | |
1980 | x->type && x->type->get_mtu) | |
1981 | res = x->type->get_mtu(x, mtu); | |
1982 | else | |
28121617 | 1983 | res = mtu - x->props.header_len; |
c5c25238 | 1984 | spin_unlock_bh(&x->lock); |
1da177e4 LT |
1985 | return res; |
1986 | } | |
1987 | ||
72cb6962 HX |
1988 | int xfrm_init_state(struct xfrm_state *x) |
1989 | { | |
d094cd83 | 1990 | struct xfrm_state_afinfo *afinfo; |
df9dcb45 | 1991 | struct xfrm_mode *inner_mode; |
d094cd83 | 1992 | int family = x->props.family; |
72cb6962 HX |
1993 | int err; |
1994 | ||
d094cd83 HX |
1995 | err = -EAFNOSUPPORT; |
1996 | afinfo = xfrm_state_get_afinfo(family); | |
1997 | if (!afinfo) | |
1998 | goto error; | |
1999 | ||
2000 | err = 0; | |
2001 | if (afinfo->init_flags) | |
2002 | err = afinfo->init_flags(x); | |
2003 | ||
2004 | xfrm_state_put_afinfo(afinfo); | |
2005 | ||
2006 | if (err) | |
2007 | goto error; | |
2008 | ||
2009 | err = -EPROTONOSUPPORT; | |
13996378 | 2010 | |
df9dcb45 KM |
2011 | if (x->sel.family != AF_UNSPEC) { |
2012 | inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); | |
2013 | if (inner_mode == NULL) | |
2014 | goto error; | |
2015 | ||
2016 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && | |
2017 | family != x->sel.family) { | |
2018 | xfrm_put_mode(inner_mode); | |
2019 | goto error; | |
2020 | } | |
2021 | ||
2022 | x->inner_mode = inner_mode; | |
2023 | } else { | |
2024 | struct xfrm_mode *inner_mode_iaf; | |
2025 | ||
2026 | inner_mode = xfrm_get_mode(x->props.mode, AF_INET); | |
2027 | if (inner_mode == NULL) | |
2028 | goto error; | |
2029 | ||
2030 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
2031 | xfrm_put_mode(inner_mode); | |
2032 | goto error; | |
2033 | } | |
2034 | ||
2035 | inner_mode_iaf = xfrm_get_mode(x->props.mode, AF_INET6); | |
2036 | if (inner_mode_iaf == NULL) | |
2037 | goto error; | |
2038 | ||
2039 | if (!(inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
2040 | xfrm_put_mode(inner_mode_iaf); | |
2041 | goto error; | |
2042 | } | |
2043 | ||
2044 | if (x->props.family == AF_INET) { | |
2045 | x->inner_mode = inner_mode; | |
2046 | x->inner_mode_iaf = inner_mode_iaf; | |
2047 | } else { | |
2048 | x->inner_mode = inner_mode_iaf; | |
2049 | x->inner_mode_iaf = inner_mode; | |
2050 | } | |
2051 | } | |
13996378 | 2052 | |
d094cd83 | 2053 | x->type = xfrm_get_type(x->id.proto, family); |
72cb6962 HX |
2054 | if (x->type == NULL) |
2055 | goto error; | |
2056 | ||
2057 | err = x->type->init_state(x); | |
2058 | if (err) | |
2059 | goto error; | |
2060 | ||
13996378 HX |
2061 | x->outer_mode = xfrm_get_mode(x->props.mode, family); |
2062 | if (x->outer_mode == NULL) | |
b59f45d0 HX |
2063 | goto error; |
2064 | ||
72cb6962 HX |
2065 | x->km.state = XFRM_STATE_VALID; |
2066 | ||
2067 | error: | |
2068 | return err; | |
2069 | } | |
2070 | ||
2071 | EXPORT_SYMBOL(xfrm_init_state); | |
a716c119 | 2072 | |
d62ddc21 | 2073 | int __net_init xfrm_state_init(struct net *net) |
1da177e4 | 2074 | { |
f034b5d4 DM |
2075 | unsigned int sz; |
2076 | ||
9d4139c7 AD |
2077 | INIT_LIST_HEAD(&net->xfrm.state_all); |
2078 | ||
f034b5d4 DM |
2079 | sz = sizeof(struct hlist_head) * 8; |
2080 | ||
73d189dc AD |
2081 | net->xfrm.state_bydst = xfrm_hash_alloc(sz); |
2082 | if (!net->xfrm.state_bydst) | |
2083 | goto out_bydst; | |
d320bbb3 AD |
2084 | net->xfrm.state_bysrc = xfrm_hash_alloc(sz); |
2085 | if (!net->xfrm.state_bysrc) | |
2086 | goto out_bysrc; | |
b754a4fd AD |
2087 | net->xfrm.state_byspi = xfrm_hash_alloc(sz); |
2088 | if (!net->xfrm.state_byspi) | |
2089 | goto out_byspi; | |
529983ec | 2090 | net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); |
1da177e4 | 2091 | |
0bf7c5b0 | 2092 | net->xfrm.state_num = 0; |
63082733 | 2093 | INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); |
b8a0ae20 | 2094 | INIT_HLIST_HEAD(&net->xfrm.state_gc_list); |
c7837144 | 2095 | INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); |
50a30657 | 2096 | init_waitqueue_head(&net->xfrm.km_waitq); |
d62ddc21 | 2097 | return 0; |
73d189dc | 2098 | |
b754a4fd AD |
2099 | out_byspi: |
2100 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
d320bbb3 AD |
2101 | out_bysrc: |
2102 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
73d189dc AD |
2103 | out_bydst: |
2104 | return -ENOMEM; | |
d62ddc21 AD |
2105 | } |
2106 | ||
2107 | void xfrm_state_fini(struct net *net) | |
2108 | { | |
7c2776ee | 2109 | struct xfrm_audit audit_info; |
73d189dc AD |
2110 | unsigned int sz; |
2111 | ||
7c2776ee AD |
2112 | flush_work(&net->xfrm.state_hash_work); |
2113 | audit_info.loginuid = -1; | |
2114 | audit_info.sessionid = -1; | |
2115 | audit_info.secid = 0; | |
2116 | xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info); | |
2117 | flush_work(&net->xfrm.state_gc_work); | |
2118 | ||
9d4139c7 | 2119 | WARN_ON(!list_empty(&net->xfrm.state_all)); |
73d189dc | 2120 | |
529983ec | 2121 | sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); |
b754a4fd AD |
2122 | WARN_ON(!hlist_empty(net->xfrm.state_byspi)); |
2123 | xfrm_hash_free(net->xfrm.state_byspi, sz); | |
d320bbb3 AD |
2124 | WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); |
2125 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
73d189dc AD |
2126 | WARN_ON(!hlist_empty(net->xfrm.state_bydst)); |
2127 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
1da177e4 LT |
2128 | } |
2129 | ||
ab5f5e8b | 2130 | #ifdef CONFIG_AUDITSYSCALL |
cf35f43e IJ |
2131 | static void xfrm_audit_helper_sainfo(struct xfrm_state *x, |
2132 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2133 | { |
68277acc PM |
2134 | struct xfrm_sec_ctx *ctx = x->security; |
2135 | u32 spi = ntohl(x->id.spi); | |
2136 | ||
2137 | if (ctx) | |
ab5f5e8b | 2138 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
68277acc | 2139 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b JL |
2140 | |
2141 | switch(x->props.family) { | |
2142 | case AF_INET: | |
21454aaa HH |
2143 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2144 | &x->props.saddr.a4, &x->id.daddr.a4); | |
ab5f5e8b JL |
2145 | break; |
2146 | case AF_INET6: | |
5b095d98 | 2147 | audit_log_format(audit_buf, " src=%pI6 dst=%pI6", |
fdb46ee7 | 2148 | x->props.saddr.a6, x->id.daddr.a6); |
ab5f5e8b JL |
2149 | break; |
2150 | } | |
68277acc PM |
2151 | |
2152 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
ab5f5e8b JL |
2153 | } |
2154 | ||
cf35f43e IJ |
2155 | static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, |
2156 | struct audit_buffer *audit_buf) | |
afeb14b4 PM |
2157 | { |
2158 | struct iphdr *iph4; | |
2159 | struct ipv6hdr *iph6; | |
2160 | ||
2161 | switch (family) { | |
2162 | case AF_INET: | |
2163 | iph4 = ip_hdr(skb); | |
21454aaa HH |
2164 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2165 | &iph4->saddr, &iph4->daddr); | |
afeb14b4 PM |
2166 | break; |
2167 | case AF_INET6: | |
2168 | iph6 = ipv6_hdr(skb); | |
2169 | audit_log_format(audit_buf, | |
5b095d98 | 2170 | " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", |
fdb46ee7 | 2171 | &iph6->saddr,&iph6->daddr, |
afeb14b4 PM |
2172 | iph6->flow_lbl[0] & 0x0f, |
2173 | iph6->flow_lbl[1], | |
2174 | iph6->flow_lbl[2]); | |
2175 | break; | |
2176 | } | |
2177 | } | |
2178 | ||
68277acc | 2179 | void xfrm_audit_state_add(struct xfrm_state *x, int result, |
2532386f | 2180 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2181 | { |
2182 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2183 | |
afeb14b4 | 2184 | audit_buf = xfrm_audit_start("SAD-add"); |
ab5f5e8b JL |
2185 | if (audit_buf == NULL) |
2186 | return; | |
2532386f | 2187 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2188 | xfrm_audit_helper_sainfo(x, audit_buf); |
2189 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2190 | audit_log_end(audit_buf); |
2191 | } | |
2192 | EXPORT_SYMBOL_GPL(xfrm_audit_state_add); | |
2193 | ||
68277acc | 2194 | void xfrm_audit_state_delete(struct xfrm_state *x, int result, |
2532386f | 2195 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2196 | { |
2197 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2198 | |
afeb14b4 | 2199 | audit_buf = xfrm_audit_start("SAD-delete"); |
ab5f5e8b JL |
2200 | if (audit_buf == NULL) |
2201 | return; | |
2532386f | 2202 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2203 | xfrm_audit_helper_sainfo(x, audit_buf); |
2204 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2205 | audit_log_end(audit_buf); |
2206 | } | |
2207 | EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); | |
afeb14b4 PM |
2208 | |
2209 | void xfrm_audit_state_replay_overflow(struct xfrm_state *x, | |
2210 | struct sk_buff *skb) | |
2211 | { | |
2212 | struct audit_buffer *audit_buf; | |
2213 | u32 spi; | |
2214 | ||
2215 | audit_buf = xfrm_audit_start("SA-replay-overflow"); | |
2216 | if (audit_buf == NULL) | |
2217 | return; | |
2218 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2219 | /* don't record the sequence number because it's inherent in this kind | |
2220 | * of audit message */ | |
2221 | spi = ntohl(x->id.spi); | |
2222 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
2223 | audit_log_end(audit_buf); | |
2224 | } | |
2225 | EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); | |
2226 | ||
2227 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
2228 | struct sk_buff *skb, __be32 net_seq) | |
2229 | { | |
2230 | struct audit_buffer *audit_buf; | |
2231 | u32 spi; | |
2232 | ||
2233 | audit_buf = xfrm_audit_start("SA-replayed-pkt"); | |
2234 | if (audit_buf == NULL) | |
2235 | return; | |
2236 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2237 | spi = ntohl(x->id.spi); | |
2238 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2239 | spi, spi, ntohl(net_seq)); | |
2240 | audit_log_end(audit_buf); | |
2241 | } | |
2242 | ||
2243 | void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) | |
2244 | { | |
2245 | struct audit_buffer *audit_buf; | |
2246 | ||
2247 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2248 | if (audit_buf == NULL) | |
2249 | return; | |
2250 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2251 | audit_log_end(audit_buf); | |
2252 | } | |
2253 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); | |
2254 | ||
2255 | void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, | |
2256 | __be32 net_spi, __be32 net_seq) | |
2257 | { | |
2258 | struct audit_buffer *audit_buf; | |
2259 | u32 spi; | |
2260 | ||
2261 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2262 | if (audit_buf == NULL) | |
2263 | return; | |
2264 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2265 | spi = ntohl(net_spi); | |
2266 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2267 | spi, spi, ntohl(net_seq)); | |
2268 | audit_log_end(audit_buf); | |
2269 | } | |
2270 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); | |
2271 | ||
2272 | void xfrm_audit_state_icvfail(struct xfrm_state *x, | |
2273 | struct sk_buff *skb, u8 proto) | |
2274 | { | |
2275 | struct audit_buffer *audit_buf; | |
2276 | __be32 net_spi; | |
2277 | __be32 net_seq; | |
2278 | ||
2279 | audit_buf = xfrm_audit_start("SA-icv-failure"); | |
2280 | if (audit_buf == NULL) | |
2281 | return; | |
2282 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2283 | if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { | |
2284 | u32 spi = ntohl(net_spi); | |
2285 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2286 | spi, spi, ntohl(net_seq)); | |
2287 | } | |
2288 | audit_log_end(audit_buf); | |
2289 | } | |
2290 | EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); | |
ab5f5e8b | 2291 | #endif /* CONFIG_AUDITSYSCALL */ |