Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * xfrm_state.c | |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * YOSHIFUJI Hideaki @USAGI | |
10 | * Split up af-specific functions | |
11 | * Derek Atkins <derek@ihtfp.com> | |
12 | * Add UDP Encapsulation | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
16 | #include <linux/workqueue.h> | |
17 | #include <net/xfrm.h> | |
18 | #include <linux/pfkeyv2.h> | |
19 | #include <linux/ipsec.h> | |
20 | #include <linux/module.h> | |
f034b5d4 | 21 | #include <linux/cache.h> |
68277acc | 22 | #include <linux/audit.h> |
b5890d8b | 23 | #include <asm/uaccess.h> |
9e0d57fd | 24 | #include <linux/ktime.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
9e0d57fd YP |
26 | #include <linux/interrupt.h> |
27 | #include <linux/kernel.h> | |
1da177e4 | 28 | |
44e36b42 DM |
29 | #include "xfrm_hash.h" |
30 | ||
1da177e4 LT |
31 | /* Each xfrm_state may be linked to two tables: |
32 | ||
33 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) | |
a624c108 | 34 | 2. Hash table by (daddr,family,reqid) to find what SAs exist for given |
1da177e4 LT |
35 | destination/tunnel endpoint. (output) |
36 | */ | |
37 | ||
38 | static DEFINE_SPINLOCK(xfrm_state_lock); | |
39 | ||
f034b5d4 | 40 | static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; |
f034b5d4 | 41 | |
17c2a42a HX |
42 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); |
43 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
44 | ||
64d0cd00 | 45 | static inline unsigned int xfrm_dst_hash(struct net *net, |
2ab38503 DM |
46 | const xfrm_address_t *daddr, |
47 | const xfrm_address_t *saddr, | |
c1969f29 | 48 | u32 reqid, |
a624c108 | 49 | unsigned short family) |
f034b5d4 | 50 | { |
64d0cd00 | 51 | return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); |
f034b5d4 DM |
52 | } |
53 | ||
64d0cd00 | 54 | static inline unsigned int xfrm_src_hash(struct net *net, |
2ab38503 DM |
55 | const xfrm_address_t *daddr, |
56 | const xfrm_address_t *saddr, | |
44e36b42 | 57 | unsigned short family) |
f034b5d4 | 58 | { |
64d0cd00 | 59 | return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); |
f034b5d4 DM |
60 | } |
61 | ||
f034b5d4 | 62 | static inline unsigned int |
2ab38503 DM |
63 | xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr, |
64 | __be32 spi, u8 proto, unsigned short family) | |
f034b5d4 | 65 | { |
64d0cd00 | 66 | return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); |
f034b5d4 DM |
67 | } |
68 | ||
f034b5d4 DM |
69 | static void xfrm_hash_transfer(struct hlist_head *list, |
70 | struct hlist_head *ndsttable, | |
71 | struct hlist_head *nsrctable, | |
72 | struct hlist_head *nspitable, | |
73 | unsigned int nhashmask) | |
74 | { | |
75 | struct hlist_node *entry, *tmp; | |
76 | struct xfrm_state *x; | |
77 | ||
78 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
79 | unsigned int h; | |
80 | ||
c1969f29 DM |
81 | h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
82 | x->props.reqid, x->props.family, | |
83 | nhashmask); | |
f034b5d4 DM |
84 | hlist_add_head(&x->bydst, ndsttable+h); |
85 | ||
667bbcb6 MN |
86 | h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, |
87 | x->props.family, | |
f034b5d4 DM |
88 | nhashmask); |
89 | hlist_add_head(&x->bysrc, nsrctable+h); | |
90 | ||
7b4dc360 MN |
91 | if (x->id.spi) { |
92 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, | |
93 | x->id.proto, x->props.family, | |
94 | nhashmask); | |
95 | hlist_add_head(&x->byspi, nspitable+h); | |
96 | } | |
f034b5d4 DM |
97 | } |
98 | } | |
99 | ||
63082733 | 100 | static unsigned long xfrm_hash_new_size(unsigned int state_hmask) |
f034b5d4 | 101 | { |
63082733 | 102 | return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); |
f034b5d4 DM |
103 | } |
104 | ||
105 | static DEFINE_MUTEX(hash_resize_mutex); | |
106 | ||
63082733 | 107 | static void xfrm_hash_resize(struct work_struct *work) |
f034b5d4 | 108 | { |
63082733 | 109 | struct net *net = container_of(work, struct net, xfrm.state_hash_work); |
f034b5d4 DM |
110 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; |
111 | unsigned long nsize, osize; | |
112 | unsigned int nhashmask, ohashmask; | |
113 | int i; | |
114 | ||
115 | mutex_lock(&hash_resize_mutex); | |
116 | ||
63082733 | 117 | nsize = xfrm_hash_new_size(net->xfrm.state_hmask); |
44e36b42 | 118 | ndst = xfrm_hash_alloc(nsize); |
f034b5d4 DM |
119 | if (!ndst) |
120 | goto out_unlock; | |
44e36b42 | 121 | nsrc = xfrm_hash_alloc(nsize); |
f034b5d4 | 122 | if (!nsrc) { |
44e36b42 | 123 | xfrm_hash_free(ndst, nsize); |
f034b5d4 DM |
124 | goto out_unlock; |
125 | } | |
44e36b42 | 126 | nspi = xfrm_hash_alloc(nsize); |
f034b5d4 | 127 | if (!nspi) { |
44e36b42 DM |
128 | xfrm_hash_free(ndst, nsize); |
129 | xfrm_hash_free(nsrc, nsize); | |
f034b5d4 DM |
130 | goto out_unlock; |
131 | } | |
132 | ||
133 | spin_lock_bh(&xfrm_state_lock); | |
134 | ||
135 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
63082733 AD |
136 | for (i = net->xfrm.state_hmask; i >= 0; i--) |
137 | xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi, | |
f034b5d4 DM |
138 | nhashmask); |
139 | ||
63082733 AD |
140 | odst = net->xfrm.state_bydst; |
141 | osrc = net->xfrm.state_bysrc; | |
142 | ospi = net->xfrm.state_byspi; | |
143 | ohashmask = net->xfrm.state_hmask; | |
f034b5d4 | 144 | |
63082733 AD |
145 | net->xfrm.state_bydst = ndst; |
146 | net->xfrm.state_bysrc = nsrc; | |
147 | net->xfrm.state_byspi = nspi; | |
148 | net->xfrm.state_hmask = nhashmask; | |
f034b5d4 DM |
149 | |
150 | spin_unlock_bh(&xfrm_state_lock); | |
151 | ||
152 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 DM |
153 | xfrm_hash_free(odst, osize); |
154 | xfrm_hash_free(osrc, osize); | |
155 | xfrm_hash_free(ospi, osize); | |
f034b5d4 DM |
156 | |
157 | out_unlock: | |
158 | mutex_unlock(&hash_resize_mutex); | |
159 | } | |
160 | ||
44abdc30 CW |
161 | static DEFINE_SPINLOCK(xfrm_state_afinfo_lock); |
162 | static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO]; | |
1da177e4 | 163 | |
1da177e4 LT |
164 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
165 | ||
53bc6b4d | 166 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 | 167 | |
980ebd25 | 168 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
15e47304 | 169 | void km_state_expired(struct xfrm_state *x, int hard, u32 portid); |
1da177e4 | 170 | |
aa5d62cc HX |
171 | static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family) |
172 | { | |
173 | struct xfrm_state_afinfo *afinfo; | |
174 | if (unlikely(family >= NPROTO)) | |
175 | return NULL; | |
44abdc30 | 176 | spin_lock_bh(&xfrm_state_afinfo_lock); |
aa5d62cc HX |
177 | afinfo = xfrm_state_afinfo[family]; |
178 | if (unlikely(!afinfo)) | |
44abdc30 | 179 | spin_unlock_bh(&xfrm_state_afinfo_lock); |
aa5d62cc HX |
180 | return afinfo; |
181 | } | |
182 | ||
183 | static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo) | |
184 | { | |
44abdc30 | 185 | spin_unlock_bh(&xfrm_state_afinfo_lock); |
aa5d62cc HX |
186 | } |
187 | ||
533cb5b0 | 188 | int xfrm_register_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
189 | { |
190 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 191 | const struct xfrm_type **typemap; |
aa5d62cc HX |
192 | int err = 0; |
193 | ||
194 | if (unlikely(afinfo == NULL)) | |
195 | return -EAFNOSUPPORT; | |
196 | typemap = afinfo->type_map; | |
197 | ||
198 | if (likely(typemap[type->proto] == NULL)) | |
199 | typemap[type->proto] = type; | |
200 | else | |
201 | err = -EEXIST; | |
202 | xfrm_state_unlock_afinfo(afinfo); | |
203 | return err; | |
204 | } | |
205 | EXPORT_SYMBOL(xfrm_register_type); | |
206 | ||
533cb5b0 | 207 | int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
208 | { |
209 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 210 | const struct xfrm_type **typemap; |
aa5d62cc HX |
211 | int err = 0; |
212 | ||
213 | if (unlikely(afinfo == NULL)) | |
214 | return -EAFNOSUPPORT; | |
215 | typemap = afinfo->type_map; | |
216 | ||
217 | if (unlikely(typemap[type->proto] != type)) | |
218 | err = -ENOENT; | |
219 | else | |
220 | typemap[type->proto] = NULL; | |
221 | xfrm_state_unlock_afinfo(afinfo); | |
222 | return err; | |
223 | } | |
224 | EXPORT_SYMBOL(xfrm_unregister_type); | |
225 | ||
533cb5b0 | 226 | static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) |
aa5d62cc HX |
227 | { |
228 | struct xfrm_state_afinfo *afinfo; | |
533cb5b0 ED |
229 | const struct xfrm_type **typemap; |
230 | const struct xfrm_type *type; | |
aa5d62cc HX |
231 | int modload_attempted = 0; |
232 | ||
233 | retry: | |
234 | afinfo = xfrm_state_get_afinfo(family); | |
235 | if (unlikely(afinfo == NULL)) | |
236 | return NULL; | |
237 | typemap = afinfo->type_map; | |
238 | ||
239 | type = typemap[proto]; | |
240 | if (unlikely(type && !try_module_get(type->owner))) | |
241 | type = NULL; | |
242 | if (!type && !modload_attempted) { | |
243 | xfrm_state_put_afinfo(afinfo); | |
244 | request_module("xfrm-type-%d-%d", family, proto); | |
245 | modload_attempted = 1; | |
246 | goto retry; | |
247 | } | |
248 | ||
249 | xfrm_state_put_afinfo(afinfo); | |
250 | return type; | |
251 | } | |
252 | ||
533cb5b0 | 253 | static void xfrm_put_type(const struct xfrm_type *type) |
aa5d62cc HX |
254 | { |
255 | module_put(type->owner); | |
256 | } | |
257 | ||
258 | int xfrm_register_mode(struct xfrm_mode *mode, int family) | |
259 | { | |
260 | struct xfrm_state_afinfo *afinfo; | |
261 | struct xfrm_mode **modemap; | |
262 | int err; | |
263 | ||
264 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
265 | return -EINVAL; | |
266 | ||
267 | afinfo = xfrm_state_lock_afinfo(family); | |
268 | if (unlikely(afinfo == NULL)) | |
269 | return -EAFNOSUPPORT; | |
270 | ||
271 | err = -EEXIST; | |
272 | modemap = afinfo->mode_map; | |
17c2a42a HX |
273 | if (modemap[mode->encap]) |
274 | goto out; | |
aa5d62cc | 275 | |
17c2a42a HX |
276 | err = -ENOENT; |
277 | if (!try_module_get(afinfo->owner)) | |
278 | goto out; | |
279 | ||
280 | mode->afinfo = afinfo; | |
281 | modemap[mode->encap] = mode; | |
282 | err = 0; | |
283 | ||
284 | out: | |
aa5d62cc HX |
285 | xfrm_state_unlock_afinfo(afinfo); |
286 | return err; | |
287 | } | |
288 | EXPORT_SYMBOL(xfrm_register_mode); | |
289 | ||
290 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
291 | { | |
292 | struct xfrm_state_afinfo *afinfo; | |
293 | struct xfrm_mode **modemap; | |
294 | int err; | |
295 | ||
296 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
297 | return -EINVAL; | |
298 | ||
299 | afinfo = xfrm_state_lock_afinfo(family); | |
300 | if (unlikely(afinfo == NULL)) | |
301 | return -EAFNOSUPPORT; | |
302 | ||
303 | err = -ENOENT; | |
304 | modemap = afinfo->mode_map; | |
305 | if (likely(modemap[mode->encap] == mode)) { | |
306 | modemap[mode->encap] = NULL; | |
17c2a42a | 307 | module_put(mode->afinfo->owner); |
aa5d62cc HX |
308 | err = 0; |
309 | } | |
310 | ||
311 | xfrm_state_unlock_afinfo(afinfo); | |
312 | return err; | |
313 | } | |
314 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
315 | ||
316 | static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
317 | { | |
318 | struct xfrm_state_afinfo *afinfo; | |
319 | struct xfrm_mode *mode; | |
320 | int modload_attempted = 0; | |
321 | ||
322 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
323 | return NULL; | |
324 | ||
325 | retry: | |
326 | afinfo = xfrm_state_get_afinfo(family); | |
327 | if (unlikely(afinfo == NULL)) | |
328 | return NULL; | |
329 | ||
330 | mode = afinfo->mode_map[encap]; | |
331 | if (unlikely(mode && !try_module_get(mode->owner))) | |
332 | mode = NULL; | |
333 | if (!mode && !modload_attempted) { | |
334 | xfrm_state_put_afinfo(afinfo); | |
335 | request_module("xfrm-mode-%d-%d", family, encap); | |
336 | modload_attempted = 1; | |
337 | goto retry; | |
338 | } | |
339 | ||
340 | xfrm_state_put_afinfo(afinfo); | |
341 | return mode; | |
342 | } | |
343 | ||
344 | static void xfrm_put_mode(struct xfrm_mode *mode) | |
345 | { | |
346 | module_put(mode->owner); | |
347 | } | |
348 | ||
1da177e4 LT |
349 | static void xfrm_state_gc_destroy(struct xfrm_state *x) |
350 | { | |
9e0d57fd | 351 | tasklet_hrtimer_cancel(&x->mtimer); |
a47f0ce0 | 352 | del_timer_sync(&x->rtimer); |
a51482bd JJ |
353 | kfree(x->aalg); |
354 | kfree(x->ealg); | |
355 | kfree(x->calg); | |
356 | kfree(x->encap); | |
060f02a3 | 357 | kfree(x->coaddr); |
d8647b79 SK |
358 | kfree(x->replay_esn); |
359 | kfree(x->preplay_esn); | |
13996378 HX |
360 | if (x->inner_mode) |
361 | xfrm_put_mode(x->inner_mode); | |
df9dcb45 KM |
362 | if (x->inner_mode_iaf) |
363 | xfrm_put_mode(x->inner_mode_iaf); | |
13996378 HX |
364 | if (x->outer_mode) |
365 | xfrm_put_mode(x->outer_mode); | |
1da177e4 LT |
366 | if (x->type) { |
367 | x->type->destructor(x); | |
368 | xfrm_put_type(x->type); | |
369 | } | |
df71837d | 370 | security_xfrm_state_free(x); |
1da177e4 LT |
371 | kfree(x); |
372 | } | |
373 | ||
c7837144 | 374 | static void xfrm_state_gc_task(struct work_struct *work) |
1da177e4 | 375 | { |
c7837144 | 376 | struct net *net = container_of(work, struct net, xfrm.state_gc_work); |
12a169e7 HX |
377 | struct xfrm_state *x; |
378 | struct hlist_node *entry, *tmp; | |
379 | struct hlist_head gc_list; | |
1da177e4 | 380 | |
1da177e4 | 381 | spin_lock_bh(&xfrm_state_gc_lock); |
c7837144 | 382 | hlist_move_list(&net->xfrm.state_gc_list, &gc_list); |
1da177e4 LT |
383 | spin_unlock_bh(&xfrm_state_gc_lock); |
384 | ||
12a169e7 | 385 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist) |
1da177e4 | 386 | xfrm_state_gc_destroy(x); |
8f126e37 | 387 | |
50a30657 | 388 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
389 | } |
390 | ||
391 | static inline unsigned long make_jiffies(long secs) | |
392 | { | |
393 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
394 | return MAX_SCHEDULE_TIMEOUT-1; | |
395 | else | |
a716c119 | 396 | return secs*HZ; |
1da177e4 LT |
397 | } |
398 | ||
9e0d57fd | 399 | static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me) |
1da177e4 | 400 | { |
9e0d57fd YP |
401 | struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer); |
402 | struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer); | |
98806f75 | 403 | struct net *net = xs_net(x); |
9d729f72 | 404 | unsigned long now = get_seconds(); |
1da177e4 LT |
405 | long next = LONG_MAX; |
406 | int warn = 0; | |
161a09e7 | 407 | int err = 0; |
1da177e4 LT |
408 | |
409 | spin_lock(&x->lock); | |
410 | if (x->km.state == XFRM_STATE_DEAD) | |
411 | goto out; | |
412 | if (x->km.state == XFRM_STATE_EXPIRED) | |
413 | goto expired; | |
414 | if (x->lft.hard_add_expires_seconds) { | |
415 | long tmo = x->lft.hard_add_expires_seconds + | |
416 | x->curlft.add_time - now; | |
e3c0d047 FD |
417 | if (tmo <= 0) { |
418 | if (x->xflags & XFRM_SOFT_EXPIRE) { | |
419 | /* enter hard expire without soft expire first?! | |
420 | * setting a new date could trigger this. | |
421 | * workarbound: fix x->curflt.add_time by below: | |
422 | */ | |
423 | x->curlft.add_time = now - x->saved_tmo - 1; | |
424 | tmo = x->lft.hard_add_expires_seconds - x->saved_tmo; | |
425 | } else | |
426 | goto expired; | |
427 | } | |
1da177e4 LT |
428 | if (tmo < next) |
429 | next = tmo; | |
430 | } | |
431 | if (x->lft.hard_use_expires_seconds) { | |
432 | long tmo = x->lft.hard_use_expires_seconds + | |
433 | (x->curlft.use_time ? : now) - now; | |
434 | if (tmo <= 0) | |
435 | goto expired; | |
436 | if (tmo < next) | |
437 | next = tmo; | |
438 | } | |
439 | if (x->km.dying) | |
440 | goto resched; | |
441 | if (x->lft.soft_add_expires_seconds) { | |
442 | long tmo = x->lft.soft_add_expires_seconds + | |
443 | x->curlft.add_time - now; | |
e3c0d047 | 444 | if (tmo <= 0) { |
1da177e4 | 445 | warn = 1; |
e3c0d047 FD |
446 | x->xflags &= ~XFRM_SOFT_EXPIRE; |
447 | } else if (tmo < next) { | |
1da177e4 | 448 | next = tmo; |
e3c0d047 FD |
449 | x->xflags |= XFRM_SOFT_EXPIRE; |
450 | x->saved_tmo = tmo; | |
451 | } | |
1da177e4 LT |
452 | } |
453 | if (x->lft.soft_use_expires_seconds) { | |
454 | long tmo = x->lft.soft_use_expires_seconds + | |
455 | (x->curlft.use_time ? : now) - now; | |
456 | if (tmo <= 0) | |
457 | warn = 1; | |
458 | else if (tmo < next) | |
459 | next = tmo; | |
460 | } | |
461 | ||
4666faab | 462 | x->km.dying = warn; |
1da177e4 | 463 | if (warn) |
53bc6b4d | 464 | km_state_expired(x, 0, 0); |
1da177e4 | 465 | resched: |
9e0d57fd YP |
466 | if (next != LONG_MAX){ |
467 | tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL); | |
468 | } | |
a47f0ce0 | 469 | |
1da177e4 LT |
470 | goto out; |
471 | ||
472 | expired: | |
473 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
474 | x->km.state = XFRM_STATE_EXPIRED; | |
98806f75 | 475 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
476 | next = 2; |
477 | goto resched; | |
478 | } | |
161a09e7 JL |
479 | |
480 | err = __xfrm_state_delete(x); | |
481 | if (!err && x->id.spi) | |
53bc6b4d | 482 | km_state_expired(x, 1, 0); |
1da177e4 | 483 | |
ab5f5e8b | 484 | xfrm_audit_state_delete(x, err ? 0 : 1, |
2532386f EP |
485 | audit_get_loginuid(current), |
486 | audit_get_sessionid(current), 0); | |
161a09e7 | 487 | |
1da177e4 LT |
488 | out: |
489 | spin_unlock(&x->lock); | |
9e0d57fd | 490 | return HRTIMER_NORESTART; |
1da177e4 LT |
491 | } |
492 | ||
0ac84752 DM |
493 | static void xfrm_replay_timer_handler(unsigned long data); |
494 | ||
673c09be | 495 | struct xfrm_state *xfrm_state_alloc(struct net *net) |
1da177e4 LT |
496 | { |
497 | struct xfrm_state *x; | |
498 | ||
0da974f4 | 499 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
500 | |
501 | if (x) { | |
673c09be | 502 | write_pnet(&x->xs_net, net); |
1da177e4 LT |
503 | atomic_set(&x->refcnt, 1); |
504 | atomic_set(&x->tunnel_users, 0); | |
12a169e7 | 505 | INIT_LIST_HEAD(&x->km.all); |
8f126e37 DM |
506 | INIT_HLIST_NODE(&x->bydst); |
507 | INIT_HLIST_NODE(&x->bysrc); | |
508 | INIT_HLIST_NODE(&x->byspi); | |
9e0d57fd | 509 | tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS); |
b24b8a24 PE |
510 | setup_timer(&x->rtimer, xfrm_replay_timer_handler, |
511 | (unsigned long)x); | |
9d729f72 | 512 | x->curlft.add_time = get_seconds(); |
1da177e4 LT |
513 | x->lft.soft_byte_limit = XFRM_INF; |
514 | x->lft.soft_packet_limit = XFRM_INF; | |
515 | x->lft.hard_byte_limit = XFRM_INF; | |
516 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
517 | x->replay_maxage = 0; |
518 | x->replay_maxdiff = 0; | |
df9dcb45 KM |
519 | x->inner_mode = NULL; |
520 | x->inner_mode_iaf = NULL; | |
1da177e4 LT |
521 | spin_lock_init(&x->lock); |
522 | } | |
523 | return x; | |
524 | } | |
525 | EXPORT_SYMBOL(xfrm_state_alloc); | |
526 | ||
527 | void __xfrm_state_destroy(struct xfrm_state *x) | |
528 | { | |
98806f75 AD |
529 | struct net *net = xs_net(x); |
530 | ||
547b792c | 531 | WARN_ON(x->km.state != XFRM_STATE_DEAD); |
1da177e4 LT |
532 | |
533 | spin_lock_bh(&xfrm_state_gc_lock); | |
98806f75 | 534 | hlist_add_head(&x->gclist, &net->xfrm.state_gc_list); |
1da177e4 | 535 | spin_unlock_bh(&xfrm_state_gc_lock); |
98806f75 | 536 | schedule_work(&net->xfrm.state_gc_work); |
1da177e4 LT |
537 | } |
538 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
539 | ||
53bc6b4d | 540 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 541 | { |
98806f75 | 542 | struct net *net = xs_net(x); |
26b15dad JHS |
543 | int err = -ESRCH; |
544 | ||
1da177e4 LT |
545 | if (x->km.state != XFRM_STATE_DEAD) { |
546 | x->km.state = XFRM_STATE_DEAD; | |
547 | spin_lock(&xfrm_state_lock); | |
12a169e7 | 548 | list_del(&x->km.all); |
8f126e37 | 549 | hlist_del(&x->bydst); |
8f126e37 | 550 | hlist_del(&x->bysrc); |
a47f0ce0 | 551 | if (x->id.spi) |
8f126e37 | 552 | hlist_del(&x->byspi); |
98806f75 | 553 | net->xfrm.state_num--; |
1da177e4 | 554 | spin_unlock(&xfrm_state_lock); |
1da177e4 | 555 | |
1da177e4 LT |
556 | /* All xfrm_state objects are created by xfrm_state_alloc. |
557 | * The xfrm_state_alloc call gives a reference, and that | |
558 | * is what we are dropping here. | |
559 | */ | |
5dba4797 | 560 | xfrm_state_put(x); |
26b15dad | 561 | err = 0; |
1da177e4 | 562 | } |
26b15dad JHS |
563 | |
564 | return err; | |
1da177e4 | 565 | } |
53bc6b4d | 566 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 567 | |
26b15dad | 568 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 569 | { |
26b15dad JHS |
570 | int err; |
571 | ||
1da177e4 | 572 | spin_lock_bh(&x->lock); |
26b15dad | 573 | err = __xfrm_state_delete(x); |
1da177e4 | 574 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
575 | |
576 | return err; | |
1da177e4 LT |
577 | } |
578 | EXPORT_SYMBOL(xfrm_state_delete); | |
579 | ||
4aa2e62c JL |
580 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
581 | static inline int | |
0e602451 | 582 | xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
1da177e4 | 583 | { |
4aa2e62c JL |
584 | int i, err = 0; |
585 | ||
0e602451 | 586 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
4aa2e62c JL |
587 | struct hlist_node *entry; |
588 | struct xfrm_state *x; | |
589 | ||
0e602451 | 590 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
4aa2e62c JL |
591 | if (xfrm_id_proto_match(x->id.proto, proto) && |
592 | (err = security_xfrm_state_delete(x)) != 0) { | |
ab5f5e8b JL |
593 | xfrm_audit_state_delete(x, 0, |
594 | audit_info->loginuid, | |
2532386f | 595 | audit_info->sessionid, |
ab5f5e8b | 596 | audit_info->secid); |
4aa2e62c JL |
597 | return err; |
598 | } | |
599 | } | |
600 | } | |
601 | ||
602 | return err; | |
603 | } | |
604 | #else | |
605 | static inline int | |
0e602451 | 606 | xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
4aa2e62c JL |
607 | { |
608 | return 0; | |
609 | } | |
610 | #endif | |
611 | ||
0e602451 | 612 | int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
4aa2e62c | 613 | { |
9e64cc95 | 614 | int i, err = 0, cnt = 0; |
1da177e4 LT |
615 | |
616 | spin_lock_bh(&xfrm_state_lock); | |
0e602451 | 617 | err = xfrm_state_flush_secctx_check(net, proto, audit_info); |
4aa2e62c JL |
618 | if (err) |
619 | goto out; | |
620 | ||
9e64cc95 | 621 | err = -ESRCH; |
0e602451 | 622 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
623 | struct hlist_node *entry; |
624 | struct xfrm_state *x; | |
1da177e4 | 625 | restart: |
0e602451 | 626 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
1da177e4 | 627 | if (!xfrm_state_kern(x) && |
5794708f | 628 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
629 | xfrm_state_hold(x); |
630 | spin_unlock_bh(&xfrm_state_lock); | |
631 | ||
161a09e7 | 632 | err = xfrm_state_delete(x); |
ab5f5e8b JL |
633 | xfrm_audit_state_delete(x, err ? 0 : 1, |
634 | audit_info->loginuid, | |
2532386f | 635 | audit_info->sessionid, |
ab5f5e8b | 636 | audit_info->secid); |
1da177e4 | 637 | xfrm_state_put(x); |
9e64cc95 JHS |
638 | if (!err) |
639 | cnt++; | |
1da177e4 LT |
640 | |
641 | spin_lock_bh(&xfrm_state_lock); | |
642 | goto restart; | |
643 | } | |
644 | } | |
645 | } | |
9e64cc95 JHS |
646 | if (cnt) |
647 | err = 0; | |
4aa2e62c JL |
648 | |
649 | out: | |
1da177e4 | 650 | spin_unlock_bh(&xfrm_state_lock); |
0e602451 | 651 | wake_up(&net->xfrm.km_waitq); |
4aa2e62c | 652 | return err; |
1da177e4 LT |
653 | } |
654 | EXPORT_SYMBOL(xfrm_state_flush); | |
655 | ||
e071041b | 656 | void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) |
28d8909b JHS |
657 | { |
658 | spin_lock_bh(&xfrm_state_lock); | |
e071041b AD |
659 | si->sadcnt = net->xfrm.state_num; |
660 | si->sadhcnt = net->xfrm.state_hmask; | |
28d8909b JHS |
661 | si->sadhmcnt = xfrm_state_hashmax; |
662 | spin_unlock_bh(&xfrm_state_lock); | |
663 | } | |
664 | EXPORT_SYMBOL(xfrm_sad_getinfo); | |
665 | ||
1da177e4 | 666 | static int |
1a898592 | 667 | xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, |
04686013 | 668 | const struct xfrm_tmpl *tmpl, |
33765d06 | 669 | const xfrm_address_t *daddr, const xfrm_address_t *saddr, |
8444cf71 | 670 | unsigned short family) |
1da177e4 LT |
671 | { |
672 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
673 | if (!afinfo) | |
674 | return -1; | |
8444cf71 TE |
675 | afinfo->init_tempsel(&x->sel, fl); |
676 | ||
677 | if (family != tmpl->encap_family) { | |
678 | xfrm_state_put_afinfo(afinfo); | |
679 | afinfo = xfrm_state_get_afinfo(tmpl->encap_family); | |
680 | if (!afinfo) | |
681 | return -1; | |
682 | } | |
683 | afinfo->init_temprop(x, tmpl, daddr, saddr); | |
1da177e4 LT |
684 | xfrm_state_put_afinfo(afinfo); |
685 | return 0; | |
686 | } | |
687 | ||
9aa60088 DM |
688 | static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, |
689 | const xfrm_address_t *daddr, | |
690 | __be32 spi, u8 proto, | |
691 | unsigned short family) | |
edcd5821 | 692 | { |
221df1ed | 693 | unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); |
edcd5821 | 694 | struct xfrm_state *x; |
8f126e37 | 695 | struct hlist_node *entry; |
edcd5821 | 696 | |
221df1ed | 697 | hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) { |
edcd5821 DM |
698 | if (x->props.family != family || |
699 | x->id.spi != spi || | |
1802571b WY |
700 | x->id.proto != proto || |
701 | xfrm_addr_cmp(&x->id.daddr, daddr, family)) | |
edcd5821 DM |
702 | continue; |
703 | ||
3d6acfa7 JHS |
704 | if ((mark & x->mark.m) != x->mark.v) |
705 | continue; | |
edcd5821 DM |
706 | xfrm_state_hold(x); |
707 | return x; | |
708 | } | |
709 | ||
710 | return NULL; | |
711 | } | |
712 | ||
9aa60088 DM |
713 | static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, |
714 | const xfrm_address_t *daddr, | |
715 | const xfrm_address_t *saddr, | |
716 | u8 proto, unsigned short family) | |
edcd5821 | 717 | { |
221df1ed | 718 | unsigned int h = xfrm_src_hash(net, daddr, saddr, family); |
edcd5821 | 719 | struct xfrm_state *x; |
8f126e37 | 720 | struct hlist_node *entry; |
edcd5821 | 721 | |
221df1ed | 722 | hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) { |
edcd5821 | 723 | if (x->props.family != family || |
1802571b WY |
724 | x->id.proto != proto || |
725 | xfrm_addr_cmp(&x->id.daddr, daddr, family) || | |
726 | xfrm_addr_cmp(&x->props.saddr, saddr, family)) | |
edcd5821 DM |
727 | continue; |
728 | ||
3d6acfa7 JHS |
729 | if ((mark & x->mark.m) != x->mark.v) |
730 | continue; | |
edcd5821 DM |
731 | xfrm_state_hold(x); |
732 | return x; | |
733 | } | |
734 | ||
735 | return NULL; | |
736 | } | |
737 | ||
738 | static inline struct xfrm_state * | |
739 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
740 | { | |
221df1ed | 741 | struct net *net = xs_net(x); |
bd55775c | 742 | u32 mark = x->mark.v & x->mark.m; |
221df1ed | 743 | |
edcd5821 | 744 | if (use_spi) |
bd55775c JHS |
745 | return __xfrm_state_lookup(net, mark, &x->id.daddr, |
746 | x->id.spi, x->id.proto, family); | |
edcd5821 | 747 | else |
bd55775c JHS |
748 | return __xfrm_state_lookup_byaddr(net, mark, |
749 | &x->id.daddr, | |
edcd5821 DM |
750 | &x->props.saddr, |
751 | x->id.proto, family); | |
752 | } | |
753 | ||
98806f75 | 754 | static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) |
2fab22f2 PM |
755 | { |
756 | if (have_hash_collision && | |
98806f75 AD |
757 | (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && |
758 | net->xfrm.state_num > net->xfrm.state_hmask) | |
759 | schedule_work(&net->xfrm.state_hash_work); | |
2fab22f2 PM |
760 | } |
761 | ||
08ec9af1 | 762 | static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, |
4a08ab0f | 763 | const struct flowi *fl, unsigned short family, |
08ec9af1 DM |
764 | struct xfrm_state **best, int *acq_in_progress, |
765 | int *error) | |
766 | { | |
767 | /* Resolution logic: | |
768 | * 1. There is a valid state with matching selector. Done. | |
769 | * 2. Valid state with inappropriate selector. Skip. | |
770 | * | |
771 | * Entering area of "sysdeps". | |
772 | * | |
773 | * 3. If state is not valid, selector is temporary, it selects | |
774 | * only session which triggered previous resolution. Key | |
775 | * manager will do something to install a state with proper | |
776 | * selector. | |
777 | */ | |
778 | if (x->km.state == XFRM_STATE_VALID) { | |
779 | if ((x->sel.family && | |
780 | !xfrm_selector_match(&x->sel, fl, x->sel.family)) || | |
781 | !security_xfrm_state_pol_flow_match(x, pol, fl)) | |
782 | return; | |
783 | ||
784 | if (!*best || | |
785 | (*best)->km.dying > x->km.dying || | |
786 | ((*best)->km.dying == x->km.dying && | |
787 | (*best)->curlft.add_time < x->curlft.add_time)) | |
788 | *best = x; | |
789 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
790 | *acq_in_progress = 1; | |
791 | } else if (x->km.state == XFRM_STATE_ERROR || | |
792 | x->km.state == XFRM_STATE_EXPIRED) { | |
793 | if (xfrm_selector_match(&x->sel, fl, x->sel.family) && | |
794 | security_xfrm_state_pol_flow_match(x, pol, fl)) | |
795 | *error = -ESRCH; | |
796 | } | |
797 | } | |
798 | ||
1da177e4 | 799 | struct xfrm_state * |
33765d06 | 800 | xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, |
b520e9f6 | 801 | const struct flowi *fl, struct xfrm_tmpl *tmpl, |
1da177e4 LT |
802 | struct xfrm_policy *pol, int *err, |
803 | unsigned short family) | |
804 | { | |
08ec9af1 | 805 | static xfrm_address_t saddr_wildcard = { }; |
5447c5e4 | 806 | struct net *net = xp_net(pol); |
6a783c90 | 807 | unsigned int h, h_wildcard; |
8f126e37 | 808 | struct hlist_node *entry; |
37b08e34 | 809 | struct xfrm_state *x, *x0, *to_put; |
1da177e4 LT |
810 | int acquire_in_progress = 0; |
811 | int error = 0; | |
812 | struct xfrm_state *best = NULL; | |
bd55775c | 813 | u32 mark = pol->mark.v & pol->mark.m; |
8444cf71 | 814 | unsigned short encap_family = tmpl->encap_family; |
a716c119 | 815 | |
37b08e34 DM |
816 | to_put = NULL; |
817 | ||
1da177e4 | 818 | spin_lock_bh(&xfrm_state_lock); |
8444cf71 | 819 | h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); |
5447c5e4 | 820 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { |
8444cf71 | 821 | if (x->props.family == encap_family && |
1da177e4 | 822 | x->props.reqid == tmpl->reqid && |
3d6acfa7 | 823 | (mark & x->mark.m) == x->mark.v && |
fbd9a5b4 | 824 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
8444cf71 | 825 | xfrm_state_addr_check(x, daddr, saddr, encap_family) && |
1da177e4 LT |
826 | tmpl->mode == x->props.mode && |
827 | tmpl->id.proto == x->id.proto && | |
08ec9af1 | 828 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) |
1f673c5f | 829 | xfrm_state_look_at(pol, x, fl, encap_family, |
08ec9af1 DM |
830 | &best, &acquire_in_progress, &error); |
831 | } | |
832 | if (best) | |
833 | goto found; | |
834 | ||
8444cf71 | 835 | h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family); |
6a783c90 | 836 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) { |
8444cf71 | 837 | if (x->props.family == encap_family && |
08ec9af1 | 838 | x->props.reqid == tmpl->reqid && |
3d6acfa7 | 839 | (mark & x->mark.m) == x->mark.v && |
08ec9af1 | 840 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
8444cf71 | 841 | xfrm_state_addr_check(x, daddr, saddr, encap_family) && |
08ec9af1 DM |
842 | tmpl->mode == x->props.mode && |
843 | tmpl->id.proto == x->id.proto && | |
844 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) | |
1f673c5f | 845 | xfrm_state_look_at(pol, x, fl, encap_family, |
08ec9af1 | 846 | &best, &acquire_in_progress, &error); |
1da177e4 LT |
847 | } |
848 | ||
08ec9af1 | 849 | found: |
1da177e4 LT |
850 | x = best; |
851 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 852 | if (tmpl->id.spi && |
bd55775c | 853 | (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi, |
8444cf71 | 854 | tmpl->id.proto, encap_family)) != NULL) { |
37b08e34 | 855 | to_put = x0; |
1da177e4 LT |
856 | error = -EEXIST; |
857 | goto out; | |
858 | } | |
5447c5e4 | 859 | x = xfrm_state_alloc(net); |
1da177e4 LT |
860 | if (x == NULL) { |
861 | error = -ENOMEM; | |
862 | goto out; | |
863 | } | |
8444cf71 | 864 | /* Initialize temporary state matching only |
1da177e4 | 865 | * to current session. */ |
8444cf71 | 866 | xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); |
bd55775c | 867 | memcpy(&x->mark, &pol->mark, sizeof(x->mark)); |
1da177e4 | 868 | |
1d28f42c | 869 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); |
e0d1caa7 VY |
870 | if (error) { |
871 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 872 | to_put = x; |
e0d1caa7 VY |
873 | x = NULL; |
874 | goto out; | |
875 | } | |
876 | ||
1da177e4 LT |
877 | if (km_query(x, tmpl, pol) == 0) { |
878 | x->km.state = XFRM_STATE_ACQ; | |
5447c5e4 AD |
879 | list_add(&x->km.all, &net->xfrm.state_all); |
880 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
8444cf71 | 881 | h = xfrm_src_hash(net, daddr, saddr, encap_family); |
5447c5e4 | 882 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); |
1da177e4 | 883 | if (x->id.spi) { |
8444cf71 | 884 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); |
5447c5e4 | 885 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); |
1da177e4 | 886 | } |
b27aeadb | 887 | x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
9e0d57fd | 888 | tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); |
5447c5e4 AD |
889 | net->xfrm.state_num++; |
890 | xfrm_hash_grow_check(net, x->bydst.next != NULL); | |
1da177e4 LT |
891 | } else { |
892 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 893 | to_put = x; |
1da177e4 LT |
894 | x = NULL; |
895 | error = -ESRCH; | |
896 | } | |
897 | } | |
898 | out: | |
899 | if (x) | |
900 | xfrm_state_hold(x); | |
901 | else | |
902 | *err = acquire_in_progress ? -EAGAIN : error; | |
903 | spin_unlock_bh(&xfrm_state_lock); | |
37b08e34 DM |
904 | if (to_put) |
905 | xfrm_state_put(to_put); | |
1da177e4 LT |
906 | return x; |
907 | } | |
908 | ||
628529b6 | 909 | struct xfrm_state * |
bd55775c | 910 | xfrm_stateonly_find(struct net *net, u32 mark, |
5447c5e4 | 911 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
628529b6 JHS |
912 | unsigned short family, u8 mode, u8 proto, u32 reqid) |
913 | { | |
4bda4f25 | 914 | unsigned int h; |
628529b6 JHS |
915 | struct xfrm_state *rx = NULL, *x = NULL; |
916 | struct hlist_node *entry; | |
917 | ||
918 | spin_lock(&xfrm_state_lock); | |
5447c5e4 AD |
919 | h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
920 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
628529b6 JHS |
921 | if (x->props.family == family && |
922 | x->props.reqid == reqid && | |
3d6acfa7 | 923 | (mark & x->mark.m) == x->mark.v && |
628529b6 JHS |
924 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
925 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
926 | mode == x->props.mode && | |
927 | proto == x->id.proto && | |
928 | x->km.state == XFRM_STATE_VALID) { | |
929 | rx = x; | |
930 | break; | |
931 | } | |
932 | } | |
933 | ||
934 | if (rx) | |
935 | xfrm_state_hold(rx); | |
936 | spin_unlock(&xfrm_state_lock); | |
937 | ||
938 | ||
939 | return rx; | |
940 | } | |
941 | EXPORT_SYMBOL(xfrm_stateonly_find); | |
942 | ||
1da177e4 LT |
943 | static void __xfrm_state_insert(struct xfrm_state *x) |
944 | { | |
98806f75 | 945 | struct net *net = xs_net(x); |
a624c108 | 946 | unsigned int h; |
1da177e4 | 947 | |
98806f75 | 948 | list_add(&x->km.all, &net->xfrm.state_all); |
4c563f76 | 949 | |
98806f75 | 950 | h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, |
c1969f29 | 951 | x->props.reqid, x->props.family); |
98806f75 | 952 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); |
1da177e4 | 953 | |
98806f75 AD |
954 | h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); |
955 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
1da177e4 | 956 | |
7b4dc360 | 957 | if (x->id.spi) { |
98806f75 | 958 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, |
6c44e6b7 MN |
959 | x->props.family); |
960 | ||
98806f75 | 961 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); |
6c44e6b7 MN |
962 | } |
963 | ||
9e0d57fd | 964 | tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); |
a47f0ce0 DM |
965 | if (x->replay_maxage) |
966 | mod_timer(&x->rtimer, jiffies + x->replay_maxage); | |
f8cd5488 | 967 | |
98806f75 | 968 | wake_up(&net->xfrm.km_waitq); |
f034b5d4 | 969 | |
98806f75 | 970 | net->xfrm.state_num++; |
f034b5d4 | 971 | |
98806f75 | 972 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
1da177e4 LT |
973 | } |
974 | ||
c7f5ea3a DM |
975 | /* xfrm_state_lock is held */ |
976 | static void __xfrm_state_bump_genids(struct xfrm_state *xnew) | |
977 | { | |
98806f75 | 978 | struct net *net = xs_net(xnew); |
c7f5ea3a DM |
979 | unsigned short family = xnew->props.family; |
980 | u32 reqid = xnew->props.reqid; | |
981 | struct xfrm_state *x; | |
982 | struct hlist_node *entry; | |
983 | unsigned int h; | |
3d6acfa7 | 984 | u32 mark = xnew->mark.v & xnew->mark.m; |
c7f5ea3a | 985 | |
98806f75 AD |
986 | h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); |
987 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
c7f5ea3a DM |
988 | if (x->props.family == family && |
989 | x->props.reqid == reqid && | |
3d6acfa7 | 990 | (mark & x->mark.m) == x->mark.v && |
c1969f29 DM |
991 | !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && |
992 | !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) | |
34996cb9 | 993 | x->genid++; |
c7f5ea3a DM |
994 | } |
995 | } | |
996 | ||
1da177e4 LT |
997 | void xfrm_state_insert(struct xfrm_state *x) |
998 | { | |
999 | spin_lock_bh(&xfrm_state_lock); | |
c7f5ea3a | 1000 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
1001 | __xfrm_state_insert(x); |
1002 | spin_unlock_bh(&xfrm_state_lock); | |
1003 | } | |
1004 | EXPORT_SYMBOL(xfrm_state_insert); | |
1005 | ||
2770834c | 1006 | /* xfrm_state_lock is held */ |
a70486f0 DM |
1007 | static struct xfrm_state *__find_acq_core(struct net *net, struct xfrm_mark *m, |
1008 | unsigned short family, u8 mode, | |
1009 | u32 reqid, u8 proto, | |
1010 | const xfrm_address_t *daddr, | |
1011 | const xfrm_address_t *saddr, int create) | |
2770834c | 1012 | { |
5447c5e4 | 1013 | unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
8f126e37 | 1014 | struct hlist_node *entry; |
2770834c | 1015 | struct xfrm_state *x; |
3d6acfa7 | 1016 | u32 mark = m->v & m->m; |
2770834c | 1017 | |
5447c5e4 | 1018 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { |
2770834c DM |
1019 | if (x->props.reqid != reqid || |
1020 | x->props.mode != mode || | |
1021 | x->props.family != family || | |
1022 | x->km.state != XFRM_STATE_ACQ || | |
75e252d9 | 1023 | x->id.spi != 0 || |
1802571b | 1024 | x->id.proto != proto || |
3d6acfa7 | 1025 | (mark & x->mark.m) != x->mark.v || |
1802571b WY |
1026 | xfrm_addr_cmp(&x->id.daddr, daddr, family) || |
1027 | xfrm_addr_cmp(&x->props.saddr, saddr, family)) | |
2770834c DM |
1028 | continue; |
1029 | ||
2770834c DM |
1030 | xfrm_state_hold(x); |
1031 | return x; | |
1032 | } | |
1033 | ||
1034 | if (!create) | |
1035 | return NULL; | |
1036 | ||
5447c5e4 | 1037 | x = xfrm_state_alloc(net); |
2770834c DM |
1038 | if (likely(x)) { |
1039 | switch (family) { | |
1040 | case AF_INET: | |
1041 | x->sel.daddr.a4 = daddr->a4; | |
1042 | x->sel.saddr.a4 = saddr->a4; | |
1043 | x->sel.prefixlen_d = 32; | |
1044 | x->sel.prefixlen_s = 32; | |
1045 | x->props.saddr.a4 = saddr->a4; | |
1046 | x->id.daddr.a4 = daddr->a4; | |
1047 | break; | |
1048 | ||
1049 | case AF_INET6: | |
4e3fd7a0 AD |
1050 | *(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr; |
1051 | *(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr; | |
2770834c DM |
1052 | x->sel.prefixlen_d = 128; |
1053 | x->sel.prefixlen_s = 128; | |
4e3fd7a0 AD |
1054 | *(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr; |
1055 | *(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr; | |
2770834c | 1056 | break; |
3ff50b79 | 1057 | } |
2770834c DM |
1058 | |
1059 | x->km.state = XFRM_STATE_ACQ; | |
1060 | x->id.proto = proto; | |
1061 | x->props.family = family; | |
1062 | x->props.mode = mode; | |
1063 | x->props.reqid = reqid; | |
bd55775c JHS |
1064 | x->mark.v = m->v; |
1065 | x->mark.m = m->m; | |
b27aeadb | 1066 | x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; |
2770834c | 1067 | xfrm_state_hold(x); |
9e0d57fd | 1068 | tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL); |
5447c5e4 AD |
1069 | list_add(&x->km.all, &net->xfrm.state_all); |
1070 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
1071 | h = xfrm_src_hash(net, daddr, saddr, family); | |
1072 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
918049f0 | 1073 | |
5447c5e4 | 1074 | net->xfrm.state_num++; |
918049f0 | 1075 | |
5447c5e4 | 1076 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
2770834c DM |
1077 | } |
1078 | ||
1079 | return x; | |
1080 | } | |
1081 | ||
bd55775c | 1082 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); |
1da177e4 LT |
1083 | |
1084 | int xfrm_state_add(struct xfrm_state *x) | |
1085 | { | |
5447c5e4 | 1086 | struct net *net = xs_net(x); |
37b08e34 | 1087 | struct xfrm_state *x1, *to_put; |
1da177e4 LT |
1088 | int family; |
1089 | int err; | |
bd55775c | 1090 | u32 mark = x->mark.v & x->mark.m; |
eb2971b6 | 1091 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
1092 | |
1093 | family = x->props.family; | |
1da177e4 | 1094 | |
37b08e34 DM |
1095 | to_put = NULL; |
1096 | ||
1da177e4 LT |
1097 | spin_lock_bh(&xfrm_state_lock); |
1098 | ||
edcd5821 | 1099 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 | 1100 | if (x1) { |
37b08e34 | 1101 | to_put = x1; |
1da177e4 LT |
1102 | x1 = NULL; |
1103 | err = -EEXIST; | |
1104 | goto out; | |
1105 | } | |
1106 | ||
eb2971b6 | 1107 | if (use_spi && x->km.seq) { |
bd55775c | 1108 | x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); |
75e252d9 JL |
1109 | if (x1 && ((x1->id.proto != x->id.proto) || |
1110 | xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) { | |
37b08e34 | 1111 | to_put = x1; |
1da177e4 LT |
1112 | x1 = NULL; |
1113 | } | |
1114 | } | |
1115 | ||
eb2971b6 | 1116 | if (use_spi && !x1) |
bd55775c JHS |
1117 | x1 = __find_acq_core(net, &x->mark, family, x->props.mode, |
1118 | x->props.reqid, x->id.proto, | |
2770834c | 1119 | &x->id.daddr, &x->props.saddr, 0); |
1da177e4 | 1120 | |
c7f5ea3a | 1121 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
1122 | __xfrm_state_insert(x); |
1123 | err = 0; | |
1124 | ||
1125 | out: | |
1126 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
1127 | |
1128 | if (x1) { | |
1129 | xfrm_state_delete(x1); | |
1130 | xfrm_state_put(x1); | |
1131 | } | |
1132 | ||
37b08e34 DM |
1133 | if (to_put) |
1134 | xfrm_state_put(to_put); | |
1135 | ||
1da177e4 LT |
1136 | return err; |
1137 | } | |
1138 | EXPORT_SYMBOL(xfrm_state_add); | |
1139 | ||
80c9abaa | 1140 | #ifdef CONFIG_XFRM_MIGRATE |
6666351d | 1141 | static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) |
80c9abaa | 1142 | { |
98806f75 | 1143 | struct net *net = xs_net(orig); |
80c9abaa | 1144 | int err = -ENOMEM; |
98806f75 | 1145 | struct xfrm_state *x = xfrm_state_alloc(net); |
80c9abaa | 1146 | if (!x) |
553f9118 | 1147 | goto out; |
80c9abaa SS |
1148 | |
1149 | memcpy(&x->id, &orig->id, sizeof(x->id)); | |
1150 | memcpy(&x->sel, &orig->sel, sizeof(x->sel)); | |
1151 | memcpy(&x->lft, &orig->lft, sizeof(x->lft)); | |
1152 | x->props.mode = orig->props.mode; | |
1153 | x->props.replay_window = orig->props.replay_window; | |
1154 | x->props.reqid = orig->props.reqid; | |
1155 | x->props.family = orig->props.family; | |
1156 | x->props.saddr = orig->props.saddr; | |
1157 | ||
1158 | if (orig->aalg) { | |
4447bb33 | 1159 | x->aalg = xfrm_algo_auth_clone(orig->aalg); |
80c9abaa SS |
1160 | if (!x->aalg) |
1161 | goto error; | |
1162 | } | |
1163 | x->props.aalgo = orig->props.aalgo; | |
1164 | ||
1165 | if (orig->ealg) { | |
1166 | x->ealg = xfrm_algo_clone(orig->ealg); | |
1167 | if (!x->ealg) | |
1168 | goto error; | |
1169 | } | |
1170 | x->props.ealgo = orig->props.ealgo; | |
1171 | ||
1172 | if (orig->calg) { | |
1173 | x->calg = xfrm_algo_clone(orig->calg); | |
1174 | if (!x->calg) | |
1175 | goto error; | |
1176 | } | |
1177 | x->props.calgo = orig->props.calgo; | |
1178 | ||
a716c119 | 1179 | if (orig->encap) { |
80c9abaa SS |
1180 | x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); |
1181 | if (!x->encap) | |
1182 | goto error; | |
1183 | } | |
1184 | ||
1185 | if (orig->coaddr) { | |
1186 | x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), | |
1187 | GFP_KERNEL); | |
1188 | if (!x->coaddr) | |
1189 | goto error; | |
1190 | } | |
1191 | ||
af2f464e SK |
1192 | if (orig->replay_esn) { |
1193 | err = xfrm_replay_clone(x, orig); | |
1194 | if (err) | |
1195 | goto error; | |
1196 | } | |
1197 | ||
bd55775c JHS |
1198 | memcpy(&x->mark, &orig->mark, sizeof(x->mark)); |
1199 | ||
80c9abaa SS |
1200 | err = xfrm_init_state(x); |
1201 | if (err) | |
1202 | goto error; | |
1203 | ||
1204 | x->props.flags = orig->props.flags; | |
1205 | ||
1206 | x->curlft.add_time = orig->curlft.add_time; | |
1207 | x->km.state = orig->km.state; | |
1208 | x->km.seq = orig->km.seq; | |
1209 | ||
1210 | return x; | |
1211 | ||
1212 | error: | |
553f9118 HX |
1213 | xfrm_state_put(x); |
1214 | out: | |
80c9abaa SS |
1215 | if (errp) |
1216 | *errp = err; | |
80c9abaa SS |
1217 | return NULL; |
1218 | } | |
80c9abaa SS |
1219 | |
1220 | /* xfrm_state_lock is held */ | |
1221 | struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) | |
1222 | { | |
1223 | unsigned int h; | |
1224 | struct xfrm_state *x; | |
1225 | struct hlist_node *entry; | |
1226 | ||
1227 | if (m->reqid) { | |
64d0cd00 | 1228 | h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1229 | m->reqid, m->old_family); |
73d189dc | 1230 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { |
80c9abaa SS |
1231 | if (x->props.mode != m->mode || |
1232 | x->id.proto != m->proto) | |
1233 | continue; | |
1234 | if (m->reqid && x->props.reqid != m->reqid) | |
1235 | continue; | |
1236 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1237 | m->old_family) || | |
1238 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1239 | m->old_family)) | |
1240 | continue; | |
1241 | xfrm_state_hold(x); | |
1242 | return x; | |
1243 | } | |
1244 | } else { | |
64d0cd00 | 1245 | h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1246 | m->old_family); |
d320bbb3 | 1247 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) { |
80c9abaa SS |
1248 | if (x->props.mode != m->mode || |
1249 | x->id.proto != m->proto) | |
1250 | continue; | |
1251 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1252 | m->old_family) || | |
1253 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1254 | m->old_family)) | |
1255 | continue; | |
1256 | xfrm_state_hold(x); | |
1257 | return x; | |
1258 | } | |
1259 | } | |
1260 | ||
a716c119 | 1261 | return NULL; |
80c9abaa SS |
1262 | } |
1263 | EXPORT_SYMBOL(xfrm_migrate_state_find); | |
1264 | ||
1265 | struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, | |
1266 | struct xfrm_migrate *m) | |
1267 | { | |
1268 | struct xfrm_state *xc; | |
1269 | int err; | |
1270 | ||
1271 | xc = xfrm_state_clone(x, &err); | |
1272 | if (!xc) | |
1273 | return NULL; | |
1274 | ||
1275 | memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); | |
1276 | memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); | |
1277 | ||
1278 | /* add state */ | |
1279 | if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) { | |
1280 | /* a care is needed when the destination address of the | |
1281 | state is to be updated as it is a part of triplet */ | |
1282 | xfrm_state_insert(xc); | |
1283 | } else { | |
1284 | if ((err = xfrm_state_add(xc)) < 0) | |
1285 | goto error; | |
1286 | } | |
1287 | ||
1288 | return xc; | |
1289 | error: | |
78347c8c | 1290 | xfrm_state_put(xc); |
80c9abaa SS |
1291 | return NULL; |
1292 | } | |
1293 | EXPORT_SYMBOL(xfrm_state_migrate); | |
1294 | #endif | |
1295 | ||
1da177e4 LT |
1296 | int xfrm_state_update(struct xfrm_state *x) |
1297 | { | |
37b08e34 | 1298 | struct xfrm_state *x1, *to_put; |
1da177e4 | 1299 | int err; |
eb2971b6 | 1300 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 1301 | |
37b08e34 DM |
1302 | to_put = NULL; |
1303 | ||
1da177e4 | 1304 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 1305 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
1306 | |
1307 | err = -ESRCH; | |
1308 | if (!x1) | |
1309 | goto out; | |
1310 | ||
1311 | if (xfrm_state_kern(x1)) { | |
37b08e34 | 1312 | to_put = x1; |
1da177e4 LT |
1313 | err = -EEXIST; |
1314 | goto out; | |
1315 | } | |
1316 | ||
1317 | if (x1->km.state == XFRM_STATE_ACQ) { | |
1318 | __xfrm_state_insert(x); | |
1319 | x = NULL; | |
1320 | } | |
1321 | err = 0; | |
1322 | ||
1323 | out: | |
1324 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 | 1325 | |
37b08e34 DM |
1326 | if (to_put) |
1327 | xfrm_state_put(to_put); | |
1328 | ||
1da177e4 LT |
1329 | if (err) |
1330 | return err; | |
1331 | ||
1332 | if (!x) { | |
1333 | xfrm_state_delete(x1); | |
1334 | xfrm_state_put(x1); | |
1335 | return 0; | |
1336 | } | |
1337 | ||
1338 | err = -EINVAL; | |
1339 | spin_lock_bh(&x1->lock); | |
1340 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
1341 | if (x->encap && x1->encap) | |
1342 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
1343 | if (x->coaddr && x1->coaddr) { |
1344 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
1345 | } | |
1346 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
1347 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
1348 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
1349 | x1->km.dying = 0; | |
1350 | ||
9e0d57fd | 1351 | tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL); |
1da177e4 LT |
1352 | if (x1->curlft.use_time) |
1353 | xfrm_state_check_expire(x1); | |
1354 | ||
1355 | err = 0; | |
8fcbc637 TG |
1356 | x->km.state = XFRM_STATE_DEAD; |
1357 | __xfrm_state_put(x); | |
1da177e4 LT |
1358 | } |
1359 | spin_unlock_bh(&x1->lock); | |
1360 | ||
1361 | xfrm_state_put(x1); | |
1362 | ||
1363 | return err; | |
1364 | } | |
1365 | EXPORT_SYMBOL(xfrm_state_update); | |
1366 | ||
1367 | int xfrm_state_check_expire(struct xfrm_state *x) | |
1368 | { | |
1369 | if (!x->curlft.use_time) | |
9d729f72 | 1370 | x->curlft.use_time = get_seconds(); |
1da177e4 | 1371 | |
1da177e4 LT |
1372 | if (x->curlft.bytes >= x->lft.hard_byte_limit || |
1373 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 1374 | x->km.state = XFRM_STATE_EXPIRED; |
9e0d57fd | 1375 | tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL); |
1da177e4 LT |
1376 | return -EINVAL; |
1377 | } | |
1378 | ||
1379 | if (!x->km.dying && | |
1380 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
1381 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
1382 | x->km.dying = 1; | |
53bc6b4d | 1383 | km_state_expired(x, 0, 0); |
4666faab | 1384 | } |
1da177e4 LT |
1385 | return 0; |
1386 | } | |
1387 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
1388 | ||
1da177e4 | 1389 | struct xfrm_state * |
a70486f0 | 1390 | xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, |
bd55775c | 1391 | u8 proto, unsigned short family) |
1da177e4 LT |
1392 | { |
1393 | struct xfrm_state *x; | |
1da177e4 LT |
1394 | |
1395 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1396 | x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); |
1da177e4 | 1397 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
1398 | return x; |
1399 | } | |
1400 | EXPORT_SYMBOL(xfrm_state_lookup); | |
1401 | ||
1402 | struct xfrm_state * | |
bd55775c | 1403 | xfrm_state_lookup_byaddr(struct net *net, u32 mark, |
a70486f0 | 1404 | const xfrm_address_t *daddr, const xfrm_address_t *saddr, |
eb2971b6 MN |
1405 | u8 proto, unsigned short family) |
1406 | { | |
1407 | struct xfrm_state *x; | |
eb2971b6 MN |
1408 | |
1409 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1410 | x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); |
eb2971b6 | 1411 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
1412 | return x; |
1413 | } | |
1414 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
1415 | ||
1416 | struct xfrm_state * | |
bd55775c | 1417 | xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto, |
a70486f0 | 1418 | const xfrm_address_t *daddr, const xfrm_address_t *saddr, |
1da177e4 LT |
1419 | int create, unsigned short family) |
1420 | { | |
1421 | struct xfrm_state *x; | |
1da177e4 LT |
1422 | |
1423 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1424 | x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 1425 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 1426 | |
1da177e4 LT |
1427 | return x; |
1428 | } | |
1429 | EXPORT_SYMBOL(xfrm_find_acq); | |
1430 | ||
41a49cc3 MN |
1431 | #ifdef CONFIG_XFRM_SUB_POLICY |
1432 | int | |
1433 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
1434 | unsigned short family) | |
1435 | { | |
1436 | int err = 0; | |
1437 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1438 | if (!afinfo) | |
1439 | return -EAFNOSUPPORT; | |
1440 | ||
1441 | spin_lock_bh(&xfrm_state_lock); | |
1442 | if (afinfo->tmpl_sort) | |
1443 | err = afinfo->tmpl_sort(dst, src, n); | |
1444 | spin_unlock_bh(&xfrm_state_lock); | |
1445 | xfrm_state_put_afinfo(afinfo); | |
1446 | return err; | |
1447 | } | |
1448 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
1449 | ||
1450 | int | |
1451 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
1452 | unsigned short family) | |
1453 | { | |
1454 | int err = 0; | |
1455 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1456 | if (!afinfo) | |
1457 | return -EAFNOSUPPORT; | |
1458 | ||
1459 | spin_lock_bh(&xfrm_state_lock); | |
1460 | if (afinfo->state_sort) | |
1461 | err = afinfo->state_sort(dst, src, n); | |
1462 | spin_unlock_bh(&xfrm_state_lock); | |
1463 | xfrm_state_put_afinfo(afinfo); | |
1464 | return err; | |
1465 | } | |
1466 | EXPORT_SYMBOL(xfrm_state_sort); | |
1467 | #endif | |
1468 | ||
1da177e4 LT |
1469 | /* Silly enough, but I'm lazy to build resolution list */ |
1470 | ||
bd55775c | 1471 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) |
1da177e4 LT |
1472 | { |
1473 | int i; | |
1da177e4 | 1474 | |
5447c5e4 | 1475 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
1476 | struct hlist_node *entry; |
1477 | struct xfrm_state *x; | |
1478 | ||
5447c5e4 | 1479 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
8f126e37 | 1480 | if (x->km.seq == seq && |
3d6acfa7 | 1481 | (mark & x->mark.m) == x->mark.v && |
8f126e37 | 1482 | x->km.state == XFRM_STATE_ACQ) { |
1da177e4 LT |
1483 | xfrm_state_hold(x); |
1484 | return x; | |
1485 | } | |
1486 | } | |
1487 | } | |
1488 | return NULL; | |
1489 | } | |
1490 | ||
bd55775c | 1491 | struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) |
1da177e4 LT |
1492 | { |
1493 | struct xfrm_state *x; | |
1494 | ||
1495 | spin_lock_bh(&xfrm_state_lock); | |
bd55775c | 1496 | x = __xfrm_find_acq_byseq(net, mark, seq); |
1da177e4 LT |
1497 | spin_unlock_bh(&xfrm_state_lock); |
1498 | return x; | |
1499 | } | |
1500 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1501 | ||
1502 | u32 xfrm_get_acqseq(void) | |
1503 | { | |
1504 | u32 res; | |
6836b9bd | 1505 | static atomic_t acqseq; |
1506 | ||
1507 | do { | |
1508 | res = atomic_inc_return(&acqseq); | |
1509 | } while (!res); | |
1da177e4 | 1510 | |
1da177e4 LT |
1511 | return res; |
1512 | } | |
1513 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1514 | ||
658b219e | 1515 | int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) |
1da177e4 | 1516 | { |
221df1ed | 1517 | struct net *net = xs_net(x); |
f034b5d4 | 1518 | unsigned int h; |
1da177e4 | 1519 | struct xfrm_state *x0; |
658b219e HX |
1520 | int err = -ENOENT; |
1521 | __be32 minspi = htonl(low); | |
1522 | __be32 maxspi = htonl(high); | |
bd55775c | 1523 | u32 mark = x->mark.v & x->mark.m; |
1da177e4 | 1524 | |
658b219e HX |
1525 | spin_lock_bh(&x->lock); |
1526 | if (x->km.state == XFRM_STATE_DEAD) | |
1527 | goto unlock; | |
1528 | ||
1529 | err = 0; | |
1da177e4 | 1530 | if (x->id.spi) |
658b219e HX |
1531 | goto unlock; |
1532 | ||
1533 | err = -ENOENT; | |
1da177e4 LT |
1534 | |
1535 | if (minspi == maxspi) { | |
bd55775c | 1536 | x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); |
1da177e4 LT |
1537 | if (x0) { |
1538 | xfrm_state_put(x0); | |
658b219e | 1539 | goto unlock; |
1da177e4 LT |
1540 | } |
1541 | x->id.spi = minspi; | |
1542 | } else { | |
1543 | u32 spi = 0; | |
26977b4e AV |
1544 | for (h=0; h<high-low+1; h++) { |
1545 | spi = low + net_random()%(high-low+1); | |
bd55775c | 1546 | x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
1da177e4 LT |
1547 | if (x0 == NULL) { |
1548 | x->id.spi = htonl(spi); | |
1549 | break; | |
1550 | } | |
1551 | xfrm_state_put(x0); | |
1552 | } | |
1553 | } | |
1554 | if (x->id.spi) { | |
1555 | spin_lock_bh(&xfrm_state_lock); | |
12604d8a AD |
1556 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); |
1557 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 1558 | spin_unlock_bh(&xfrm_state_lock); |
658b219e HX |
1559 | |
1560 | err = 0; | |
1da177e4 | 1561 | } |
658b219e HX |
1562 | |
1563 | unlock: | |
1564 | spin_unlock_bh(&x->lock); | |
1565 | ||
1566 | return err; | |
1da177e4 LT |
1567 | } |
1568 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1569 | ||
284fa7da | 1570 | int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, |
4c563f76 | 1571 | int (*func)(struct xfrm_state *, int, void*), |
1da177e4 LT |
1572 | void *data) |
1573 | { | |
12a169e7 HX |
1574 | struct xfrm_state *state; |
1575 | struct xfrm_state_walk *x; | |
1da177e4 LT |
1576 | int err = 0; |
1577 | ||
12a169e7 | 1578 | if (walk->seq != 0 && list_empty(&walk->all)) |
4c563f76 TT |
1579 | return 0; |
1580 | ||
1da177e4 | 1581 | spin_lock_bh(&xfrm_state_lock); |
12a169e7 | 1582 | if (list_empty(&walk->all)) |
284fa7da | 1583 | x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); |
12a169e7 HX |
1584 | else |
1585 | x = list_entry(&walk->all, struct xfrm_state_walk, all); | |
284fa7da | 1586 | list_for_each_entry_from(x, &net->xfrm.state_all, all) { |
12a169e7 | 1587 | if (x->state == XFRM_STATE_DEAD) |
4c563f76 | 1588 | continue; |
12a169e7 HX |
1589 | state = container_of(x, struct xfrm_state, km); |
1590 | if (!xfrm_id_proto_match(state->id.proto, walk->proto)) | |
4c563f76 | 1591 | continue; |
12a169e7 HX |
1592 | err = func(state, walk->seq, data); |
1593 | if (err) { | |
1594 | list_move_tail(&walk->all, &x->all); | |
1595 | goto out; | |
1da177e4 | 1596 | } |
12a169e7 | 1597 | walk->seq++; |
1da177e4 | 1598 | } |
12a169e7 | 1599 | if (walk->seq == 0) { |
1da177e4 LT |
1600 | err = -ENOENT; |
1601 | goto out; | |
1602 | } | |
12a169e7 | 1603 | list_del_init(&walk->all); |
1da177e4 LT |
1604 | out: |
1605 | spin_unlock_bh(&xfrm_state_lock); | |
1606 | return err; | |
1607 | } | |
1608 | EXPORT_SYMBOL(xfrm_state_walk); | |
1609 | ||
5c182458 HX |
1610 | void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) |
1611 | { | |
12a169e7 | 1612 | INIT_LIST_HEAD(&walk->all); |
5c182458 | 1613 | walk->proto = proto; |
12a169e7 HX |
1614 | walk->state = XFRM_STATE_DEAD; |
1615 | walk->seq = 0; | |
5c182458 HX |
1616 | } |
1617 | EXPORT_SYMBOL(xfrm_state_walk_init); | |
1618 | ||
abb81c4f HX |
1619 | void xfrm_state_walk_done(struct xfrm_state_walk *walk) |
1620 | { | |
12a169e7 | 1621 | if (list_empty(&walk->all)) |
5c182458 | 1622 | return; |
5c182458 | 1623 | |
12a169e7 HX |
1624 | spin_lock_bh(&xfrm_state_lock); |
1625 | list_del(&walk->all); | |
7d0b591c | 1626 | spin_unlock_bh(&xfrm_state_lock); |
abb81c4f HX |
1627 | } |
1628 | EXPORT_SYMBOL(xfrm_state_walk_done); | |
1629 | ||
f8cd5488 JHS |
1630 | static void xfrm_replay_timer_handler(unsigned long data) |
1631 | { | |
1632 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1633 | ||
1634 | spin_lock(&x->lock); | |
1635 | ||
2717096a | 1636 | if (x->km.state == XFRM_STATE_VALID) { |
a6483b79 | 1637 | if (xfrm_aevent_is_on(xs_net(x))) |
9fdc4883 | 1638 | x->repl->notify(x, XFRM_REPLAY_TIMEOUT); |
2717096a JHS |
1639 | else |
1640 | x->xflags |= XFRM_TIME_DEFER; | |
1641 | } | |
f8cd5488 JHS |
1642 | |
1643 | spin_unlock(&x->lock); | |
1644 | } | |
1645 | ||
df01812e | 1646 | static LIST_HEAD(xfrm_km_list); |
1da177e4 | 1647 | |
214e005b | 1648 | void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) |
1da177e4 LT |
1649 | { |
1650 | struct xfrm_mgr *km; | |
1651 | ||
85168c00 CW |
1652 | rcu_read_lock(); |
1653 | list_for_each_entry_rcu(km, &xfrm_km_list, list) | |
26b15dad JHS |
1654 | if (km->notify_policy) |
1655 | km->notify_policy(xp, dir, c); | |
85168c00 | 1656 | rcu_read_unlock(); |
26b15dad | 1657 | } |
1da177e4 | 1658 | |
214e005b | 1659 | void km_state_notify(struct xfrm_state *x, const struct km_event *c) |
26b15dad JHS |
1660 | { |
1661 | struct xfrm_mgr *km; | |
85168c00 CW |
1662 | rcu_read_lock(); |
1663 | list_for_each_entry_rcu(km, &xfrm_km_list, list) | |
26b15dad JHS |
1664 | if (km->notify) |
1665 | km->notify(x, c); | |
85168c00 | 1666 | rcu_read_unlock(); |
26b15dad JHS |
1667 | } |
1668 | ||
1669 | EXPORT_SYMBOL(km_policy_notify); | |
1670 | EXPORT_SYMBOL(km_state_notify); | |
1671 | ||
15e47304 | 1672 | void km_state_expired(struct xfrm_state *x, int hard, u32 portid) |
26b15dad | 1673 | { |
98806f75 | 1674 | struct net *net = xs_net(x); |
26b15dad JHS |
1675 | struct km_event c; |
1676 | ||
bf08867f | 1677 | c.data.hard = hard; |
15e47304 | 1678 | c.portid = portid; |
f60f6b8f | 1679 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1680 | km_state_notify(x, &c); |
1da177e4 LT |
1681 | |
1682 | if (hard) | |
98806f75 | 1683 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
1684 | } |
1685 | ||
53bc6b4d | 1686 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1687 | /* |
1688 | * We send to all registered managers regardless of failure | |
1689 | * We are happy with one success | |
1690 | */ | |
980ebd25 | 1691 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1692 | { |
26b15dad | 1693 | int err = -EINVAL, acqret; |
1da177e4 LT |
1694 | struct xfrm_mgr *km; |
1695 | ||
85168c00 CW |
1696 | rcu_read_lock(); |
1697 | list_for_each_entry_rcu(km, &xfrm_km_list, list) { | |
65e0736b | 1698 | acqret = km->acquire(x, t, pol); |
26b15dad JHS |
1699 | if (!acqret) |
1700 | err = acqret; | |
1da177e4 | 1701 | } |
85168c00 | 1702 | rcu_read_unlock(); |
1da177e4 LT |
1703 | return err; |
1704 | } | |
980ebd25 | 1705 | EXPORT_SYMBOL(km_query); |
1da177e4 | 1706 | |
5d36b180 | 1707 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) |
1da177e4 LT |
1708 | { |
1709 | int err = -EINVAL; | |
1710 | struct xfrm_mgr *km; | |
1711 | ||
85168c00 CW |
1712 | rcu_read_lock(); |
1713 | list_for_each_entry_rcu(km, &xfrm_km_list, list) { | |
1da177e4 LT |
1714 | if (km->new_mapping) |
1715 | err = km->new_mapping(x, ipaddr, sport); | |
1716 | if (!err) | |
1717 | break; | |
1718 | } | |
85168c00 | 1719 | rcu_read_unlock(); |
1da177e4 LT |
1720 | return err; |
1721 | } | |
1722 | EXPORT_SYMBOL(km_new_mapping); | |
1723 | ||
15e47304 | 1724 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) |
1da177e4 | 1725 | { |
98806f75 | 1726 | struct net *net = xp_net(pol); |
26b15dad | 1727 | struct km_event c; |
1da177e4 | 1728 | |
bf08867f | 1729 | c.data.hard = hard; |
15e47304 | 1730 | c.portid = portid; |
f60f6b8f | 1731 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1732 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1733 | |
1734 | if (hard) | |
98806f75 | 1735 | wake_up(&net->xfrm.km_waitq); |
1da177e4 | 1736 | } |
a70fcb0b | 1737 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1738 | |
2d60abc2 | 1739 | #ifdef CONFIG_XFRM_MIGRATE |
183cad12 DM |
1740 | int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
1741 | const struct xfrm_migrate *m, int num_migrate, | |
1742 | const struct xfrm_kmaddress *k) | |
80c9abaa SS |
1743 | { |
1744 | int err = -EINVAL; | |
1745 | int ret; | |
1746 | struct xfrm_mgr *km; | |
1747 | ||
85168c00 CW |
1748 | rcu_read_lock(); |
1749 | list_for_each_entry_rcu(km, &xfrm_km_list, list) { | |
80c9abaa | 1750 | if (km->migrate) { |
13c1d189 | 1751 | ret = km->migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
1752 | if (!ret) |
1753 | err = ret; | |
1754 | } | |
1755 | } | |
85168c00 | 1756 | rcu_read_unlock(); |
80c9abaa SS |
1757 | return err; |
1758 | } | |
1759 | EXPORT_SYMBOL(km_migrate); | |
2d60abc2 | 1760 | #endif |
80c9abaa | 1761 | |
db983c11 | 1762 | int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
97a64b45 MN |
1763 | { |
1764 | int err = -EINVAL; | |
1765 | int ret; | |
1766 | struct xfrm_mgr *km; | |
1767 | ||
85168c00 CW |
1768 | rcu_read_lock(); |
1769 | list_for_each_entry_rcu(km, &xfrm_km_list, list) { | |
97a64b45 | 1770 | if (km->report) { |
db983c11 | 1771 | ret = km->report(net, proto, sel, addr); |
97a64b45 MN |
1772 | if (!ret) |
1773 | err = ret; | |
1774 | } | |
1775 | } | |
85168c00 | 1776 | rcu_read_unlock(); |
97a64b45 MN |
1777 | return err; |
1778 | } | |
1779 | EXPORT_SYMBOL(km_report); | |
1780 | ||
1da177e4 LT |
1781 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1782 | { | |
1783 | int err; | |
1784 | u8 *data; | |
1785 | struct xfrm_mgr *km; | |
1786 | struct xfrm_policy *pol = NULL; | |
1787 | ||
1788 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1789 | return -EMSGSIZE; | |
1790 | ||
1791 | data = kmalloc(optlen, GFP_KERNEL); | |
1792 | if (!data) | |
1793 | return -ENOMEM; | |
1794 | ||
1795 | err = -EFAULT; | |
1796 | if (copy_from_user(data, optval, optlen)) | |
1797 | goto out; | |
1798 | ||
1799 | err = -EINVAL; | |
85168c00 CW |
1800 | rcu_read_lock(); |
1801 | list_for_each_entry_rcu(km, &xfrm_km_list, list) { | |
cb969f07 | 1802 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1803 | optlen, &err); |
1804 | if (err >= 0) | |
1805 | break; | |
1806 | } | |
85168c00 | 1807 | rcu_read_unlock(); |
1da177e4 LT |
1808 | |
1809 | if (err >= 0) { | |
1810 | xfrm_sk_policy_insert(sk, err, pol); | |
1811 | xfrm_pol_put(pol); | |
1812 | err = 0; | |
1813 | } | |
1814 | ||
1815 | out: | |
1816 | kfree(data); | |
1817 | return err; | |
1818 | } | |
1819 | EXPORT_SYMBOL(xfrm_user_policy); | |
1820 | ||
85168c00 CW |
1821 | static DEFINE_SPINLOCK(xfrm_km_lock); |
1822 | ||
1da177e4 LT |
1823 | int xfrm_register_km(struct xfrm_mgr *km) |
1824 | { | |
85168c00 CW |
1825 | spin_lock_bh(&xfrm_km_lock); |
1826 | list_add_tail_rcu(&km->list, &xfrm_km_list); | |
1827 | spin_unlock_bh(&xfrm_km_lock); | |
1da177e4 LT |
1828 | return 0; |
1829 | } | |
1830 | EXPORT_SYMBOL(xfrm_register_km); | |
1831 | ||
1832 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1833 | { | |
85168c00 CW |
1834 | spin_lock_bh(&xfrm_km_lock); |
1835 | list_del_rcu(&km->list); | |
1836 | spin_unlock_bh(&xfrm_km_lock); | |
1837 | synchronize_rcu(); | |
1da177e4 LT |
1838 | return 0; |
1839 | } | |
1840 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1841 | ||
1842 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1843 | { | |
1844 | int err = 0; | |
1845 | if (unlikely(afinfo == NULL)) | |
1846 | return -EINVAL; | |
1847 | if (unlikely(afinfo->family >= NPROTO)) | |
1848 | return -EAFNOSUPPORT; | |
44abdc30 | 1849 | spin_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1850 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1851 | err = -ENOBUFS; | |
edcd5821 | 1852 | else |
44abdc30 CW |
1853 | rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); |
1854 | spin_unlock_bh(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1855 | return err; |
1856 | } | |
1857 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1858 | ||
1859 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1860 | { | |
1861 | int err = 0; | |
1862 | if (unlikely(afinfo == NULL)) | |
1863 | return -EINVAL; | |
1864 | if (unlikely(afinfo->family >= NPROTO)) | |
1865 | return -EAFNOSUPPORT; | |
44abdc30 | 1866 | spin_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1867 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1868 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1869 | err = -EINVAL; | |
edcd5821 | 1870 | else |
44abdc30 | 1871 | RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); |
1da177e4 | 1872 | } |
44abdc30 CW |
1873 | spin_unlock_bh(&xfrm_state_afinfo_lock); |
1874 | synchronize_rcu(); | |
1da177e4 LT |
1875 | return err; |
1876 | } | |
1877 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1878 | ||
17c2a42a | 1879 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) |
1da177e4 LT |
1880 | { |
1881 | struct xfrm_state_afinfo *afinfo; | |
1882 | if (unlikely(family >= NPROTO)) | |
1883 | return NULL; | |
44abdc30 CW |
1884 | rcu_read_lock(); |
1885 | afinfo = rcu_dereference(xfrm_state_afinfo[family]); | |
546be240 | 1886 | if (unlikely(!afinfo)) |
44abdc30 | 1887 | rcu_read_unlock(); |
1da177e4 LT |
1888 | return afinfo; |
1889 | } | |
1890 | ||
17c2a42a | 1891 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) |
1da177e4 | 1892 | { |
44abdc30 | 1893 | rcu_read_unlock(); |
1da177e4 LT |
1894 | } |
1895 | ||
1896 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1897 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1898 | { | |
1899 | if (x->tunnel) { | |
1900 | struct xfrm_state *t = x->tunnel; | |
1901 | ||
1902 | if (atomic_read(&t->tunnel_users) == 2) | |
1903 | xfrm_state_delete(t); | |
1904 | atomic_dec(&t->tunnel_users); | |
1905 | xfrm_state_put(t); | |
1906 | x->tunnel = NULL; | |
1907 | } | |
1908 | } | |
1909 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1910 | ||
1911 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) | |
1912 | { | |
c5c25238 | 1913 | int res; |
1da177e4 | 1914 | |
c5c25238 PM |
1915 | spin_lock_bh(&x->lock); |
1916 | if (x->km.state == XFRM_STATE_VALID && | |
1917 | x->type && x->type->get_mtu) | |
1918 | res = x->type->get_mtu(x, mtu); | |
1919 | else | |
28121617 | 1920 | res = mtu - x->props.header_len; |
c5c25238 | 1921 | spin_unlock_bh(&x->lock); |
1da177e4 LT |
1922 | return res; |
1923 | } | |
1924 | ||
a454f0cc | 1925 | int __xfrm_init_state(struct xfrm_state *x, bool init_replay) |
72cb6962 | 1926 | { |
d094cd83 | 1927 | struct xfrm_state_afinfo *afinfo; |
df9dcb45 | 1928 | struct xfrm_mode *inner_mode; |
d094cd83 | 1929 | int family = x->props.family; |
72cb6962 HX |
1930 | int err; |
1931 | ||
d094cd83 HX |
1932 | err = -EAFNOSUPPORT; |
1933 | afinfo = xfrm_state_get_afinfo(family); | |
1934 | if (!afinfo) | |
1935 | goto error; | |
1936 | ||
1937 | err = 0; | |
1938 | if (afinfo->init_flags) | |
1939 | err = afinfo->init_flags(x); | |
1940 | ||
1941 | xfrm_state_put_afinfo(afinfo); | |
1942 | ||
1943 | if (err) | |
1944 | goto error; | |
1945 | ||
1946 | err = -EPROTONOSUPPORT; | |
13996378 | 1947 | |
df9dcb45 KM |
1948 | if (x->sel.family != AF_UNSPEC) { |
1949 | inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); | |
1950 | if (inner_mode == NULL) | |
1951 | goto error; | |
1952 | ||
1953 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && | |
1954 | family != x->sel.family) { | |
1955 | xfrm_put_mode(inner_mode); | |
1956 | goto error; | |
1957 | } | |
1958 | ||
1959 | x->inner_mode = inner_mode; | |
1960 | } else { | |
1961 | struct xfrm_mode *inner_mode_iaf; | |
d81d2285 | 1962 | int iafamily = AF_INET; |
df9dcb45 | 1963 | |
d81d2285 | 1964 | inner_mode = xfrm_get_mode(x->props.mode, x->props.family); |
df9dcb45 KM |
1965 | if (inner_mode == NULL) |
1966 | goto error; | |
1967 | ||
1968 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
1969 | xfrm_put_mode(inner_mode); | |
1970 | goto error; | |
1971 | } | |
d81d2285 | 1972 | x->inner_mode = inner_mode; |
df9dcb45 | 1973 | |
d81d2285 MW |
1974 | if (x->props.family == AF_INET) |
1975 | iafamily = AF_INET6; | |
df9dcb45 | 1976 | |
d81d2285 MW |
1977 | inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); |
1978 | if (inner_mode_iaf) { | |
1979 | if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) | |
1980 | x->inner_mode_iaf = inner_mode_iaf; | |
1981 | else | |
1982 | xfrm_put_mode(inner_mode_iaf); | |
df9dcb45 KM |
1983 | } |
1984 | } | |
13996378 | 1985 | |
d094cd83 | 1986 | x->type = xfrm_get_type(x->id.proto, family); |
72cb6962 HX |
1987 | if (x->type == NULL) |
1988 | goto error; | |
1989 | ||
1990 | err = x->type->init_state(x); | |
1991 | if (err) | |
1992 | goto error; | |
1993 | ||
13996378 | 1994 | x->outer_mode = xfrm_get_mode(x->props.mode, family); |
599901c3 JL |
1995 | if (x->outer_mode == NULL) { |
1996 | err = -EPROTONOSUPPORT; | |
b59f45d0 | 1997 | goto error; |
599901c3 | 1998 | } |
b59f45d0 | 1999 | |
a454f0cc WY |
2000 | if (init_replay) { |
2001 | err = xfrm_init_replay(x); | |
2002 | if (err) | |
2003 | goto error; | |
2004 | } | |
2005 | ||
72cb6962 HX |
2006 | x->km.state = XFRM_STATE_VALID; |
2007 | ||
2008 | error: | |
2009 | return err; | |
2010 | } | |
2011 | ||
a454f0cc WY |
2012 | EXPORT_SYMBOL(__xfrm_init_state); |
2013 | ||
2014 | int xfrm_init_state(struct xfrm_state *x) | |
2015 | { | |
2016 | return __xfrm_init_state(x, true); | |
2017 | } | |
2018 | ||
72cb6962 | 2019 | EXPORT_SYMBOL(xfrm_init_state); |
a716c119 | 2020 | |
d62ddc21 | 2021 | int __net_init xfrm_state_init(struct net *net) |
1da177e4 | 2022 | { |
f034b5d4 DM |
2023 | unsigned int sz; |
2024 | ||
9d4139c7 AD |
2025 | INIT_LIST_HEAD(&net->xfrm.state_all); |
2026 | ||
f034b5d4 DM |
2027 | sz = sizeof(struct hlist_head) * 8; |
2028 | ||
73d189dc AD |
2029 | net->xfrm.state_bydst = xfrm_hash_alloc(sz); |
2030 | if (!net->xfrm.state_bydst) | |
2031 | goto out_bydst; | |
d320bbb3 AD |
2032 | net->xfrm.state_bysrc = xfrm_hash_alloc(sz); |
2033 | if (!net->xfrm.state_bysrc) | |
2034 | goto out_bysrc; | |
b754a4fd AD |
2035 | net->xfrm.state_byspi = xfrm_hash_alloc(sz); |
2036 | if (!net->xfrm.state_byspi) | |
2037 | goto out_byspi; | |
529983ec | 2038 | net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); |
1da177e4 | 2039 | |
0bf7c5b0 | 2040 | net->xfrm.state_num = 0; |
63082733 | 2041 | INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); |
b8a0ae20 | 2042 | INIT_HLIST_HEAD(&net->xfrm.state_gc_list); |
c7837144 | 2043 | INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); |
50a30657 | 2044 | init_waitqueue_head(&net->xfrm.km_waitq); |
d62ddc21 | 2045 | return 0; |
73d189dc | 2046 | |
b754a4fd AD |
2047 | out_byspi: |
2048 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
d320bbb3 AD |
2049 | out_bysrc: |
2050 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
73d189dc AD |
2051 | out_bydst: |
2052 | return -ENOMEM; | |
d62ddc21 AD |
2053 | } |
2054 | ||
2055 | void xfrm_state_fini(struct net *net) | |
2056 | { | |
7c2776ee | 2057 | struct xfrm_audit audit_info; |
73d189dc AD |
2058 | unsigned int sz; |
2059 | ||
7c2776ee | 2060 | flush_work(&net->xfrm.state_hash_work); |
e1760bd5 | 2061 | audit_info.loginuid = INVALID_UID; |
7c2776ee AD |
2062 | audit_info.sessionid = -1; |
2063 | audit_info.secid = 0; | |
2064 | xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info); | |
2065 | flush_work(&net->xfrm.state_gc_work); | |
2066 | ||
9d4139c7 | 2067 | WARN_ON(!list_empty(&net->xfrm.state_all)); |
73d189dc | 2068 | |
529983ec | 2069 | sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); |
b754a4fd AD |
2070 | WARN_ON(!hlist_empty(net->xfrm.state_byspi)); |
2071 | xfrm_hash_free(net->xfrm.state_byspi, sz); | |
d320bbb3 AD |
2072 | WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); |
2073 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
73d189dc AD |
2074 | WARN_ON(!hlist_empty(net->xfrm.state_bydst)); |
2075 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
1da177e4 LT |
2076 | } |
2077 | ||
ab5f5e8b | 2078 | #ifdef CONFIG_AUDITSYSCALL |
cf35f43e IJ |
2079 | static void xfrm_audit_helper_sainfo(struct xfrm_state *x, |
2080 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2081 | { |
68277acc PM |
2082 | struct xfrm_sec_ctx *ctx = x->security; |
2083 | u32 spi = ntohl(x->id.spi); | |
2084 | ||
2085 | if (ctx) | |
ab5f5e8b | 2086 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
68277acc | 2087 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b JL |
2088 | |
2089 | switch(x->props.family) { | |
2090 | case AF_INET: | |
21454aaa HH |
2091 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2092 | &x->props.saddr.a4, &x->id.daddr.a4); | |
ab5f5e8b JL |
2093 | break; |
2094 | case AF_INET6: | |
5b095d98 | 2095 | audit_log_format(audit_buf, " src=%pI6 dst=%pI6", |
fdb46ee7 | 2096 | x->props.saddr.a6, x->id.daddr.a6); |
ab5f5e8b JL |
2097 | break; |
2098 | } | |
68277acc PM |
2099 | |
2100 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
ab5f5e8b JL |
2101 | } |
2102 | ||
cf35f43e IJ |
2103 | static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, |
2104 | struct audit_buffer *audit_buf) | |
afeb14b4 | 2105 | { |
b71d1d42 ED |
2106 | const struct iphdr *iph4; |
2107 | const struct ipv6hdr *iph6; | |
afeb14b4 PM |
2108 | |
2109 | switch (family) { | |
2110 | case AF_INET: | |
2111 | iph4 = ip_hdr(skb); | |
21454aaa HH |
2112 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2113 | &iph4->saddr, &iph4->daddr); | |
afeb14b4 PM |
2114 | break; |
2115 | case AF_INET6: | |
2116 | iph6 = ipv6_hdr(skb); | |
2117 | audit_log_format(audit_buf, | |
5b095d98 | 2118 | " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", |
fdb46ee7 | 2119 | &iph6->saddr,&iph6->daddr, |
afeb14b4 PM |
2120 | iph6->flow_lbl[0] & 0x0f, |
2121 | iph6->flow_lbl[1], | |
2122 | iph6->flow_lbl[2]); | |
2123 | break; | |
2124 | } | |
2125 | } | |
2126 | ||
68277acc | 2127 | void xfrm_audit_state_add(struct xfrm_state *x, int result, |
e1760bd5 | 2128 | kuid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2129 | { |
2130 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2131 | |
afeb14b4 | 2132 | audit_buf = xfrm_audit_start("SAD-add"); |
ab5f5e8b JL |
2133 | if (audit_buf == NULL) |
2134 | return; | |
2532386f | 2135 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2136 | xfrm_audit_helper_sainfo(x, audit_buf); |
2137 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2138 | audit_log_end(audit_buf); |
2139 | } | |
2140 | EXPORT_SYMBOL_GPL(xfrm_audit_state_add); | |
2141 | ||
68277acc | 2142 | void xfrm_audit_state_delete(struct xfrm_state *x, int result, |
e1760bd5 | 2143 | kuid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2144 | { |
2145 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2146 | |
afeb14b4 | 2147 | audit_buf = xfrm_audit_start("SAD-delete"); |
ab5f5e8b JL |
2148 | if (audit_buf == NULL) |
2149 | return; | |
2532386f | 2150 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2151 | xfrm_audit_helper_sainfo(x, audit_buf); |
2152 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2153 | audit_log_end(audit_buf); |
2154 | } | |
2155 | EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); | |
afeb14b4 PM |
2156 | |
2157 | void xfrm_audit_state_replay_overflow(struct xfrm_state *x, | |
2158 | struct sk_buff *skb) | |
2159 | { | |
2160 | struct audit_buffer *audit_buf; | |
2161 | u32 spi; | |
2162 | ||
2163 | audit_buf = xfrm_audit_start("SA-replay-overflow"); | |
2164 | if (audit_buf == NULL) | |
2165 | return; | |
2166 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2167 | /* don't record the sequence number because it's inherent in this kind | |
2168 | * of audit message */ | |
2169 | spi = ntohl(x->id.spi); | |
2170 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
2171 | audit_log_end(audit_buf); | |
2172 | } | |
2173 | EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); | |
2174 | ||
9fdc4883 | 2175 | void xfrm_audit_state_replay(struct xfrm_state *x, |
afeb14b4 PM |
2176 | struct sk_buff *skb, __be32 net_seq) |
2177 | { | |
2178 | struct audit_buffer *audit_buf; | |
2179 | u32 spi; | |
2180 | ||
2181 | audit_buf = xfrm_audit_start("SA-replayed-pkt"); | |
2182 | if (audit_buf == NULL) | |
2183 | return; | |
2184 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2185 | spi = ntohl(x->id.spi); | |
2186 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2187 | spi, spi, ntohl(net_seq)); | |
2188 | audit_log_end(audit_buf); | |
2189 | } | |
9fdc4883 | 2190 | EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); |
afeb14b4 PM |
2191 | |
2192 | void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) | |
2193 | { | |
2194 | struct audit_buffer *audit_buf; | |
2195 | ||
2196 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2197 | if (audit_buf == NULL) | |
2198 | return; | |
2199 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2200 | audit_log_end(audit_buf); | |
2201 | } | |
2202 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); | |
2203 | ||
2204 | void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, | |
2205 | __be32 net_spi, __be32 net_seq) | |
2206 | { | |
2207 | struct audit_buffer *audit_buf; | |
2208 | u32 spi; | |
2209 | ||
2210 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2211 | if (audit_buf == NULL) | |
2212 | return; | |
2213 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2214 | spi = ntohl(net_spi); | |
2215 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2216 | spi, spi, ntohl(net_seq)); | |
2217 | audit_log_end(audit_buf); | |
2218 | } | |
2219 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); | |
2220 | ||
2221 | void xfrm_audit_state_icvfail(struct xfrm_state *x, | |
2222 | struct sk_buff *skb, u8 proto) | |
2223 | { | |
2224 | struct audit_buffer *audit_buf; | |
2225 | __be32 net_spi; | |
2226 | __be32 net_seq; | |
2227 | ||
2228 | audit_buf = xfrm_audit_start("SA-icv-failure"); | |
2229 | if (audit_buf == NULL) | |
2230 | return; | |
2231 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2232 | if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { | |
2233 | u32 spi = ntohl(net_spi); | |
2234 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2235 | spi, spi, ntohl(net_seq)); | |
2236 | } | |
2237 | audit_log_end(audit_buf); | |
2238 | } | |
2239 | EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); | |
ab5f5e8b | 2240 | #endif /* CONFIG_AUDITSYSCALL */ |