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 | ||
01e67d08 | 27 | u32 sysctl_xfrm_aevent_etime __read_mostly = XFRM_AE_ETIME; |
a70fcb0b DM |
28 | EXPORT_SYMBOL(sysctl_xfrm_aevent_etime); |
29 | ||
01e67d08 | 30 | u32 sysctl_xfrm_aevent_rseqth __read_mostly = XFRM_AE_SEQT_SIZE; |
a70fcb0b DM |
31 | EXPORT_SYMBOL(sysctl_xfrm_aevent_rseqth); |
32 | ||
01e67d08 DM |
33 | u32 sysctl_xfrm_acq_expires __read_mostly = 30; |
34 | ||
1da177e4 LT |
35 | /* Each xfrm_state may be linked to two tables: |
36 | ||
37 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) | |
a624c108 | 38 | 2. Hash table by (daddr,family,reqid) to find what SAs exist for given |
1da177e4 LT |
39 | destination/tunnel endpoint. (output) |
40 | */ | |
41 | ||
42 | static DEFINE_SPINLOCK(xfrm_state_lock); | |
43 | ||
f034b5d4 | 44 | static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; |
9d4a706d | 45 | static unsigned int xfrm_state_genid; |
f034b5d4 | 46 | |
17c2a42a HX |
47 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); |
48 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
49 | ||
afeb14b4 PM |
50 | #ifdef CONFIG_AUDITSYSCALL |
51 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
52 | struct sk_buff *skb, __be32 net_seq); | |
53 | #else | |
54 | #define xfrm_audit_state_replay(x, s, sq) do { ; } while (0) | |
55 | #endif /* CONFIG_AUDITSYSCALL */ | |
56 | ||
64d0cd00 AD |
57 | static inline unsigned int xfrm_dst_hash(struct net *net, |
58 | xfrm_address_t *daddr, | |
c1969f29 DM |
59 | xfrm_address_t *saddr, |
60 | u32 reqid, | |
a624c108 | 61 | unsigned short family) |
f034b5d4 | 62 | { |
64d0cd00 | 63 | return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); |
f034b5d4 DM |
64 | } |
65 | ||
64d0cd00 AD |
66 | static inline unsigned int xfrm_src_hash(struct net *net, |
67 | xfrm_address_t *daddr, | |
667bbcb6 | 68 | xfrm_address_t *saddr, |
44e36b42 | 69 | unsigned short family) |
f034b5d4 | 70 | { |
64d0cd00 | 71 | return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); |
f034b5d4 DM |
72 | } |
73 | ||
f034b5d4 | 74 | static inline unsigned int |
64d0cd00 | 75 | xfrm_spi_hash(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
f034b5d4 | 76 | { |
64d0cd00 | 77 | return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); |
f034b5d4 DM |
78 | } |
79 | ||
f034b5d4 DM |
80 | static void xfrm_hash_transfer(struct hlist_head *list, |
81 | struct hlist_head *ndsttable, | |
82 | struct hlist_head *nsrctable, | |
83 | struct hlist_head *nspitable, | |
84 | unsigned int nhashmask) | |
85 | { | |
86 | struct hlist_node *entry, *tmp; | |
87 | struct xfrm_state *x; | |
88 | ||
89 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
90 | unsigned int h; | |
91 | ||
c1969f29 DM |
92 | h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
93 | x->props.reqid, x->props.family, | |
94 | nhashmask); | |
f034b5d4 DM |
95 | hlist_add_head(&x->bydst, ndsttable+h); |
96 | ||
667bbcb6 MN |
97 | h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, |
98 | x->props.family, | |
f034b5d4 DM |
99 | nhashmask); |
100 | hlist_add_head(&x->bysrc, nsrctable+h); | |
101 | ||
7b4dc360 MN |
102 | if (x->id.spi) { |
103 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, | |
104 | x->id.proto, x->props.family, | |
105 | nhashmask); | |
106 | hlist_add_head(&x->byspi, nspitable+h); | |
107 | } | |
f034b5d4 DM |
108 | } |
109 | } | |
110 | ||
63082733 | 111 | static unsigned long xfrm_hash_new_size(unsigned int state_hmask) |
f034b5d4 | 112 | { |
63082733 | 113 | return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); |
f034b5d4 DM |
114 | } |
115 | ||
116 | static DEFINE_MUTEX(hash_resize_mutex); | |
117 | ||
63082733 | 118 | static void xfrm_hash_resize(struct work_struct *work) |
f034b5d4 | 119 | { |
63082733 | 120 | struct net *net = container_of(work, struct net, xfrm.state_hash_work); |
f034b5d4 DM |
121 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; |
122 | unsigned long nsize, osize; | |
123 | unsigned int nhashmask, ohashmask; | |
124 | int i; | |
125 | ||
126 | mutex_lock(&hash_resize_mutex); | |
127 | ||
63082733 | 128 | nsize = xfrm_hash_new_size(net->xfrm.state_hmask); |
44e36b42 | 129 | ndst = xfrm_hash_alloc(nsize); |
f034b5d4 DM |
130 | if (!ndst) |
131 | goto out_unlock; | |
44e36b42 | 132 | nsrc = xfrm_hash_alloc(nsize); |
f034b5d4 | 133 | if (!nsrc) { |
44e36b42 | 134 | xfrm_hash_free(ndst, nsize); |
f034b5d4 DM |
135 | goto out_unlock; |
136 | } | |
44e36b42 | 137 | nspi = xfrm_hash_alloc(nsize); |
f034b5d4 | 138 | if (!nspi) { |
44e36b42 DM |
139 | xfrm_hash_free(ndst, nsize); |
140 | xfrm_hash_free(nsrc, nsize); | |
f034b5d4 DM |
141 | goto out_unlock; |
142 | } | |
143 | ||
144 | spin_lock_bh(&xfrm_state_lock); | |
145 | ||
146 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
63082733 AD |
147 | for (i = net->xfrm.state_hmask; i >= 0; i--) |
148 | xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi, | |
f034b5d4 DM |
149 | nhashmask); |
150 | ||
63082733 AD |
151 | odst = net->xfrm.state_bydst; |
152 | osrc = net->xfrm.state_bysrc; | |
153 | ospi = net->xfrm.state_byspi; | |
154 | ohashmask = net->xfrm.state_hmask; | |
f034b5d4 | 155 | |
63082733 AD |
156 | net->xfrm.state_bydst = ndst; |
157 | net->xfrm.state_bysrc = nsrc; | |
158 | net->xfrm.state_byspi = nspi; | |
159 | net->xfrm.state_hmask = nhashmask; | |
f034b5d4 DM |
160 | |
161 | spin_unlock_bh(&xfrm_state_lock); | |
162 | ||
163 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 DM |
164 | xfrm_hash_free(odst, osize); |
165 | xfrm_hash_free(osrc, osize); | |
166 | xfrm_hash_free(ospi, osize); | |
f034b5d4 DM |
167 | |
168 | out_unlock: | |
169 | mutex_unlock(&hash_resize_mutex); | |
170 | } | |
171 | ||
1da177e4 LT |
172 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); |
173 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
174 | ||
1da177e4 LT |
175 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
176 | ||
53bc6b4d | 177 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 | 178 | |
980ebd25 | 179 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d | 180 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
1da177e4 | 181 | |
aa5d62cc HX |
182 | static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family) |
183 | { | |
184 | struct xfrm_state_afinfo *afinfo; | |
185 | if (unlikely(family >= NPROTO)) | |
186 | return NULL; | |
187 | write_lock_bh(&xfrm_state_afinfo_lock); | |
188 | afinfo = xfrm_state_afinfo[family]; | |
189 | if (unlikely(!afinfo)) | |
190 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
191 | return afinfo; | |
192 | } | |
193 | ||
194 | static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo) | |
9a429c49 | 195 | __releases(xfrm_state_afinfo_lock) |
aa5d62cc HX |
196 | { |
197 | write_unlock_bh(&xfrm_state_afinfo_lock); | |
198 | } | |
199 | ||
533cb5b0 | 200 | int xfrm_register_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
201 | { |
202 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 203 | const struct xfrm_type **typemap; |
aa5d62cc HX |
204 | int err = 0; |
205 | ||
206 | if (unlikely(afinfo == NULL)) | |
207 | return -EAFNOSUPPORT; | |
208 | typemap = afinfo->type_map; | |
209 | ||
210 | if (likely(typemap[type->proto] == NULL)) | |
211 | typemap[type->proto] = type; | |
212 | else | |
213 | err = -EEXIST; | |
214 | xfrm_state_unlock_afinfo(afinfo); | |
215 | return err; | |
216 | } | |
217 | EXPORT_SYMBOL(xfrm_register_type); | |
218 | ||
533cb5b0 | 219 | int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) |
aa5d62cc HX |
220 | { |
221 | struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family); | |
533cb5b0 | 222 | const struct xfrm_type **typemap; |
aa5d62cc HX |
223 | int err = 0; |
224 | ||
225 | if (unlikely(afinfo == NULL)) | |
226 | return -EAFNOSUPPORT; | |
227 | typemap = afinfo->type_map; | |
228 | ||
229 | if (unlikely(typemap[type->proto] != type)) | |
230 | err = -ENOENT; | |
231 | else | |
232 | typemap[type->proto] = NULL; | |
233 | xfrm_state_unlock_afinfo(afinfo); | |
234 | return err; | |
235 | } | |
236 | EXPORT_SYMBOL(xfrm_unregister_type); | |
237 | ||
533cb5b0 | 238 | static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) |
aa5d62cc HX |
239 | { |
240 | struct xfrm_state_afinfo *afinfo; | |
533cb5b0 ED |
241 | const struct xfrm_type **typemap; |
242 | const struct xfrm_type *type; | |
aa5d62cc HX |
243 | int modload_attempted = 0; |
244 | ||
245 | retry: | |
246 | afinfo = xfrm_state_get_afinfo(family); | |
247 | if (unlikely(afinfo == NULL)) | |
248 | return NULL; | |
249 | typemap = afinfo->type_map; | |
250 | ||
251 | type = typemap[proto]; | |
252 | if (unlikely(type && !try_module_get(type->owner))) | |
253 | type = NULL; | |
254 | if (!type && !modload_attempted) { | |
255 | xfrm_state_put_afinfo(afinfo); | |
256 | request_module("xfrm-type-%d-%d", family, proto); | |
257 | modload_attempted = 1; | |
258 | goto retry; | |
259 | } | |
260 | ||
261 | xfrm_state_put_afinfo(afinfo); | |
262 | return type; | |
263 | } | |
264 | ||
533cb5b0 | 265 | static void xfrm_put_type(const struct xfrm_type *type) |
aa5d62cc HX |
266 | { |
267 | module_put(type->owner); | |
268 | } | |
269 | ||
270 | int xfrm_register_mode(struct xfrm_mode *mode, int family) | |
271 | { | |
272 | struct xfrm_state_afinfo *afinfo; | |
273 | struct xfrm_mode **modemap; | |
274 | int err; | |
275 | ||
276 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
277 | return -EINVAL; | |
278 | ||
279 | afinfo = xfrm_state_lock_afinfo(family); | |
280 | if (unlikely(afinfo == NULL)) | |
281 | return -EAFNOSUPPORT; | |
282 | ||
283 | err = -EEXIST; | |
284 | modemap = afinfo->mode_map; | |
17c2a42a HX |
285 | if (modemap[mode->encap]) |
286 | goto out; | |
aa5d62cc | 287 | |
17c2a42a HX |
288 | err = -ENOENT; |
289 | if (!try_module_get(afinfo->owner)) | |
290 | goto out; | |
291 | ||
292 | mode->afinfo = afinfo; | |
293 | modemap[mode->encap] = mode; | |
294 | err = 0; | |
295 | ||
296 | out: | |
aa5d62cc HX |
297 | xfrm_state_unlock_afinfo(afinfo); |
298 | return err; | |
299 | } | |
300 | EXPORT_SYMBOL(xfrm_register_mode); | |
301 | ||
302 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
303 | { | |
304 | struct xfrm_state_afinfo *afinfo; | |
305 | struct xfrm_mode **modemap; | |
306 | int err; | |
307 | ||
308 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
309 | return -EINVAL; | |
310 | ||
311 | afinfo = xfrm_state_lock_afinfo(family); | |
312 | if (unlikely(afinfo == NULL)) | |
313 | return -EAFNOSUPPORT; | |
314 | ||
315 | err = -ENOENT; | |
316 | modemap = afinfo->mode_map; | |
317 | if (likely(modemap[mode->encap] == mode)) { | |
318 | modemap[mode->encap] = NULL; | |
17c2a42a | 319 | module_put(mode->afinfo->owner); |
aa5d62cc HX |
320 | err = 0; |
321 | } | |
322 | ||
323 | xfrm_state_unlock_afinfo(afinfo); | |
324 | return err; | |
325 | } | |
326 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
327 | ||
328 | static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
329 | { | |
330 | struct xfrm_state_afinfo *afinfo; | |
331 | struct xfrm_mode *mode; | |
332 | int modload_attempted = 0; | |
333 | ||
334 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
335 | return NULL; | |
336 | ||
337 | retry: | |
338 | afinfo = xfrm_state_get_afinfo(family); | |
339 | if (unlikely(afinfo == NULL)) | |
340 | return NULL; | |
341 | ||
342 | mode = afinfo->mode_map[encap]; | |
343 | if (unlikely(mode && !try_module_get(mode->owner))) | |
344 | mode = NULL; | |
345 | if (!mode && !modload_attempted) { | |
346 | xfrm_state_put_afinfo(afinfo); | |
347 | request_module("xfrm-mode-%d-%d", family, encap); | |
348 | modload_attempted = 1; | |
349 | goto retry; | |
350 | } | |
351 | ||
352 | xfrm_state_put_afinfo(afinfo); | |
353 | return mode; | |
354 | } | |
355 | ||
356 | static void xfrm_put_mode(struct xfrm_mode *mode) | |
357 | { | |
358 | module_put(mode->owner); | |
359 | } | |
360 | ||
1da177e4 LT |
361 | static void xfrm_state_gc_destroy(struct xfrm_state *x) |
362 | { | |
a47f0ce0 DM |
363 | del_timer_sync(&x->timer); |
364 | del_timer_sync(&x->rtimer); | |
a51482bd JJ |
365 | kfree(x->aalg); |
366 | kfree(x->ealg); | |
367 | kfree(x->calg); | |
368 | kfree(x->encap); | |
060f02a3 | 369 | kfree(x->coaddr); |
13996378 HX |
370 | if (x->inner_mode) |
371 | xfrm_put_mode(x->inner_mode); | |
df9dcb45 KM |
372 | if (x->inner_mode_iaf) |
373 | xfrm_put_mode(x->inner_mode_iaf); | |
13996378 HX |
374 | if (x->outer_mode) |
375 | xfrm_put_mode(x->outer_mode); | |
1da177e4 LT |
376 | if (x->type) { |
377 | x->type->destructor(x); | |
378 | xfrm_put_type(x->type); | |
379 | } | |
df71837d | 380 | security_xfrm_state_free(x); |
1da177e4 LT |
381 | kfree(x); |
382 | } | |
383 | ||
c7837144 | 384 | static void xfrm_state_gc_task(struct work_struct *work) |
1da177e4 | 385 | { |
c7837144 | 386 | struct net *net = container_of(work, struct net, xfrm.state_gc_work); |
12a169e7 HX |
387 | struct xfrm_state *x; |
388 | struct hlist_node *entry, *tmp; | |
389 | struct hlist_head gc_list; | |
1da177e4 | 390 | |
1da177e4 | 391 | spin_lock_bh(&xfrm_state_gc_lock); |
c7837144 | 392 | hlist_move_list(&net->xfrm.state_gc_list, &gc_list); |
1da177e4 LT |
393 | spin_unlock_bh(&xfrm_state_gc_lock); |
394 | ||
12a169e7 | 395 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist) |
1da177e4 | 396 | xfrm_state_gc_destroy(x); |
8f126e37 | 397 | |
50a30657 | 398 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
399 | } |
400 | ||
401 | static inline unsigned long make_jiffies(long secs) | |
402 | { | |
403 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
404 | return MAX_SCHEDULE_TIMEOUT-1; | |
405 | else | |
a716c119 | 406 | return secs*HZ; |
1da177e4 LT |
407 | } |
408 | ||
409 | static void xfrm_timer_handler(unsigned long data) | |
410 | { | |
411 | struct xfrm_state *x = (struct xfrm_state*)data; | |
98806f75 | 412 | struct net *net = xs_net(x); |
9d729f72 | 413 | unsigned long now = get_seconds(); |
1da177e4 LT |
414 | long next = LONG_MAX; |
415 | int warn = 0; | |
161a09e7 | 416 | int err = 0; |
1da177e4 LT |
417 | |
418 | spin_lock(&x->lock); | |
419 | if (x->km.state == XFRM_STATE_DEAD) | |
420 | goto out; | |
421 | if (x->km.state == XFRM_STATE_EXPIRED) | |
422 | goto expired; | |
423 | if (x->lft.hard_add_expires_seconds) { | |
424 | long tmo = x->lft.hard_add_expires_seconds + | |
425 | x->curlft.add_time - now; | |
426 | if (tmo <= 0) | |
427 | goto expired; | |
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; | |
444 | if (tmo <= 0) | |
445 | warn = 1; | |
446 | else if (tmo < next) | |
447 | next = tmo; | |
448 | } | |
449 | if (x->lft.soft_use_expires_seconds) { | |
450 | long tmo = x->lft.soft_use_expires_seconds + | |
451 | (x->curlft.use_time ? : now) - now; | |
452 | if (tmo <= 0) | |
453 | warn = 1; | |
454 | else if (tmo < next) | |
455 | next = tmo; | |
456 | } | |
457 | ||
4666faab | 458 | x->km.dying = warn; |
1da177e4 | 459 | if (warn) |
53bc6b4d | 460 | km_state_expired(x, 0, 0); |
1da177e4 | 461 | resched: |
a47f0ce0 DM |
462 | if (next != LONG_MAX) |
463 | mod_timer(&x->timer, jiffies + make_jiffies(next)); | |
464 | ||
1da177e4 LT |
465 | goto out; |
466 | ||
467 | expired: | |
468 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
469 | x->km.state = XFRM_STATE_EXPIRED; | |
98806f75 | 470 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
471 | next = 2; |
472 | goto resched; | |
473 | } | |
161a09e7 JL |
474 | |
475 | err = __xfrm_state_delete(x); | |
476 | if (!err && x->id.spi) | |
53bc6b4d | 477 | km_state_expired(x, 1, 0); |
1da177e4 | 478 | |
ab5f5e8b | 479 | xfrm_audit_state_delete(x, err ? 0 : 1, |
2532386f EP |
480 | audit_get_loginuid(current), |
481 | audit_get_sessionid(current), 0); | |
161a09e7 | 482 | |
1da177e4 LT |
483 | out: |
484 | spin_unlock(&x->lock); | |
1da177e4 LT |
485 | } |
486 | ||
0ac84752 DM |
487 | static void xfrm_replay_timer_handler(unsigned long data); |
488 | ||
673c09be | 489 | struct xfrm_state *xfrm_state_alloc(struct net *net) |
1da177e4 LT |
490 | { |
491 | struct xfrm_state *x; | |
492 | ||
0da974f4 | 493 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
494 | |
495 | if (x) { | |
673c09be | 496 | write_pnet(&x->xs_net, net); |
1da177e4 LT |
497 | atomic_set(&x->refcnt, 1); |
498 | atomic_set(&x->tunnel_users, 0); | |
12a169e7 | 499 | INIT_LIST_HEAD(&x->km.all); |
8f126e37 DM |
500 | INIT_HLIST_NODE(&x->bydst); |
501 | INIT_HLIST_NODE(&x->bysrc); | |
502 | INIT_HLIST_NODE(&x->byspi); | |
b24b8a24 PE |
503 | setup_timer(&x->timer, xfrm_timer_handler, (unsigned long)x); |
504 | setup_timer(&x->rtimer, xfrm_replay_timer_handler, | |
505 | (unsigned long)x); | |
9d729f72 | 506 | x->curlft.add_time = get_seconds(); |
1da177e4 LT |
507 | x->lft.soft_byte_limit = XFRM_INF; |
508 | x->lft.soft_packet_limit = XFRM_INF; | |
509 | x->lft.hard_byte_limit = XFRM_INF; | |
510 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
511 | x->replay_maxage = 0; |
512 | x->replay_maxdiff = 0; | |
df9dcb45 KM |
513 | x->inner_mode = NULL; |
514 | x->inner_mode_iaf = NULL; | |
1da177e4 LT |
515 | spin_lock_init(&x->lock); |
516 | } | |
517 | return x; | |
518 | } | |
519 | EXPORT_SYMBOL(xfrm_state_alloc); | |
520 | ||
521 | void __xfrm_state_destroy(struct xfrm_state *x) | |
522 | { | |
98806f75 AD |
523 | struct net *net = xs_net(x); |
524 | ||
547b792c | 525 | WARN_ON(x->km.state != XFRM_STATE_DEAD); |
1da177e4 LT |
526 | |
527 | spin_lock_bh(&xfrm_state_gc_lock); | |
98806f75 | 528 | hlist_add_head(&x->gclist, &net->xfrm.state_gc_list); |
1da177e4 | 529 | spin_unlock_bh(&xfrm_state_gc_lock); |
98806f75 | 530 | schedule_work(&net->xfrm.state_gc_work); |
1da177e4 LT |
531 | } |
532 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
533 | ||
53bc6b4d | 534 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 535 | { |
98806f75 | 536 | struct net *net = xs_net(x); |
26b15dad JHS |
537 | int err = -ESRCH; |
538 | ||
1da177e4 LT |
539 | if (x->km.state != XFRM_STATE_DEAD) { |
540 | x->km.state = XFRM_STATE_DEAD; | |
541 | spin_lock(&xfrm_state_lock); | |
12a169e7 | 542 | list_del(&x->km.all); |
8f126e37 | 543 | hlist_del(&x->bydst); |
8f126e37 | 544 | hlist_del(&x->bysrc); |
a47f0ce0 | 545 | if (x->id.spi) |
8f126e37 | 546 | hlist_del(&x->byspi); |
98806f75 | 547 | net->xfrm.state_num--; |
1da177e4 | 548 | spin_unlock(&xfrm_state_lock); |
1da177e4 | 549 | |
1da177e4 LT |
550 | /* All xfrm_state objects are created by xfrm_state_alloc. |
551 | * The xfrm_state_alloc call gives a reference, and that | |
552 | * is what we are dropping here. | |
553 | */ | |
5dba4797 | 554 | xfrm_state_put(x); |
26b15dad | 555 | err = 0; |
1da177e4 | 556 | } |
26b15dad JHS |
557 | |
558 | return err; | |
1da177e4 | 559 | } |
53bc6b4d | 560 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 561 | |
26b15dad | 562 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 563 | { |
26b15dad JHS |
564 | int err; |
565 | ||
1da177e4 | 566 | spin_lock_bh(&x->lock); |
26b15dad | 567 | err = __xfrm_state_delete(x); |
1da177e4 | 568 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
569 | |
570 | return err; | |
1da177e4 LT |
571 | } |
572 | EXPORT_SYMBOL(xfrm_state_delete); | |
573 | ||
4aa2e62c JL |
574 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
575 | static inline int | |
0e602451 | 576 | xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
1da177e4 | 577 | { |
4aa2e62c JL |
578 | int i, err = 0; |
579 | ||
0e602451 | 580 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
4aa2e62c JL |
581 | struct hlist_node *entry; |
582 | struct xfrm_state *x; | |
583 | ||
0e602451 | 584 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
4aa2e62c JL |
585 | if (xfrm_id_proto_match(x->id.proto, proto) && |
586 | (err = security_xfrm_state_delete(x)) != 0) { | |
ab5f5e8b JL |
587 | xfrm_audit_state_delete(x, 0, |
588 | audit_info->loginuid, | |
2532386f | 589 | audit_info->sessionid, |
ab5f5e8b | 590 | audit_info->secid); |
4aa2e62c JL |
591 | return err; |
592 | } | |
593 | } | |
594 | } | |
595 | ||
596 | return err; | |
597 | } | |
598 | #else | |
599 | static inline int | |
0e602451 | 600 | xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
4aa2e62c JL |
601 | { |
602 | return 0; | |
603 | } | |
604 | #endif | |
605 | ||
0e602451 | 606 | int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info) |
4aa2e62c JL |
607 | { |
608 | int i, err = 0; | |
1da177e4 LT |
609 | |
610 | spin_lock_bh(&xfrm_state_lock); | |
0e602451 | 611 | err = xfrm_state_flush_secctx_check(net, proto, audit_info); |
4aa2e62c JL |
612 | if (err) |
613 | goto out; | |
614 | ||
0e602451 | 615 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
616 | struct hlist_node *entry; |
617 | struct xfrm_state *x; | |
1da177e4 | 618 | restart: |
0e602451 | 619 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
1da177e4 | 620 | if (!xfrm_state_kern(x) && |
5794708f | 621 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
622 | xfrm_state_hold(x); |
623 | spin_unlock_bh(&xfrm_state_lock); | |
624 | ||
161a09e7 | 625 | err = xfrm_state_delete(x); |
ab5f5e8b JL |
626 | xfrm_audit_state_delete(x, err ? 0 : 1, |
627 | audit_info->loginuid, | |
2532386f | 628 | audit_info->sessionid, |
ab5f5e8b | 629 | audit_info->secid); |
1da177e4 LT |
630 | xfrm_state_put(x); |
631 | ||
632 | spin_lock_bh(&xfrm_state_lock); | |
633 | goto restart; | |
634 | } | |
635 | } | |
636 | } | |
4aa2e62c JL |
637 | err = 0; |
638 | ||
639 | out: | |
1da177e4 | 640 | spin_unlock_bh(&xfrm_state_lock); |
0e602451 | 641 | wake_up(&net->xfrm.km_waitq); |
4aa2e62c | 642 | return err; |
1da177e4 LT |
643 | } |
644 | EXPORT_SYMBOL(xfrm_state_flush); | |
645 | ||
af11e316 | 646 | void xfrm_sad_getinfo(struct xfrmk_sadinfo *si) |
28d8909b JHS |
647 | { |
648 | spin_lock_bh(&xfrm_state_lock); | |
0bf7c5b0 | 649 | si->sadcnt = init_net.xfrm.state_num; |
529983ec | 650 | si->sadhcnt = init_net.xfrm.state_hmask; |
28d8909b JHS |
651 | si->sadhmcnt = xfrm_state_hashmax; |
652 | spin_unlock_bh(&xfrm_state_lock); | |
653 | } | |
654 | EXPORT_SYMBOL(xfrm_sad_getinfo); | |
655 | ||
1da177e4 LT |
656 | static int |
657 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
658 | struct xfrm_tmpl *tmpl, | |
659 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
660 | unsigned short family) | |
661 | { | |
662 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
663 | if (!afinfo) | |
664 | return -1; | |
665 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
666 | xfrm_state_put_afinfo(afinfo); | |
667 | return 0; | |
668 | } | |
669 | ||
221df1ed | 670 | static struct xfrm_state *__xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
edcd5821 | 671 | { |
221df1ed | 672 | unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); |
edcd5821 | 673 | struct xfrm_state *x; |
8f126e37 | 674 | struct hlist_node *entry; |
edcd5821 | 675 | |
221df1ed | 676 | hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) { |
edcd5821 DM |
677 | if (x->props.family != family || |
678 | x->id.spi != spi || | |
679 | x->id.proto != proto) | |
680 | continue; | |
681 | ||
682 | switch (family) { | |
683 | case AF_INET: | |
684 | if (x->id.daddr.a4 != daddr->a4) | |
685 | continue; | |
686 | break; | |
687 | case AF_INET6: | |
688 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
689 | (struct in6_addr *) | |
690 | x->id.daddr.a6)) | |
691 | continue; | |
692 | break; | |
3ff50b79 | 693 | } |
edcd5821 DM |
694 | |
695 | xfrm_state_hold(x); | |
696 | return x; | |
697 | } | |
698 | ||
699 | return NULL; | |
700 | } | |
701 | ||
221df1ed | 702 | 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 | 703 | { |
221df1ed | 704 | unsigned int h = xfrm_src_hash(net, daddr, saddr, family); |
edcd5821 | 705 | struct xfrm_state *x; |
8f126e37 | 706 | struct hlist_node *entry; |
edcd5821 | 707 | |
221df1ed | 708 | hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) { |
edcd5821 DM |
709 | if (x->props.family != family || |
710 | x->id.proto != proto) | |
711 | continue; | |
712 | ||
713 | switch (family) { | |
714 | case AF_INET: | |
715 | if (x->id.daddr.a4 != daddr->a4 || | |
716 | x->props.saddr.a4 != saddr->a4) | |
717 | continue; | |
718 | break; | |
719 | case AF_INET6: | |
720 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
721 | (struct in6_addr *) | |
722 | x->id.daddr.a6) || | |
723 | !ipv6_addr_equal((struct in6_addr *)saddr, | |
724 | (struct in6_addr *) | |
725 | x->props.saddr.a6)) | |
726 | continue; | |
727 | break; | |
3ff50b79 | 728 | } |
edcd5821 DM |
729 | |
730 | xfrm_state_hold(x); | |
731 | return x; | |
732 | } | |
733 | ||
734 | return NULL; | |
735 | } | |
736 | ||
737 | static inline struct xfrm_state * | |
738 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
739 | { | |
221df1ed AD |
740 | struct net *net = xs_net(x); |
741 | ||
edcd5821 | 742 | if (use_spi) |
221df1ed | 743 | return __xfrm_state_lookup(net, &x->id.daddr, x->id.spi, |
edcd5821 DM |
744 | x->id.proto, family); |
745 | else | |
221df1ed | 746 | return __xfrm_state_lookup_byaddr(net, &x->id.daddr, |
edcd5821 DM |
747 | &x->props.saddr, |
748 | x->id.proto, family); | |
749 | } | |
750 | ||
98806f75 | 751 | static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) |
2fab22f2 PM |
752 | { |
753 | if (have_hash_collision && | |
98806f75 AD |
754 | (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && |
755 | net->xfrm.state_num > net->xfrm.state_hmask) | |
756 | schedule_work(&net->xfrm.state_hash_work); | |
2fab22f2 PM |
757 | } |
758 | ||
1da177e4 | 759 | struct xfrm_state * |
a716c119 | 760 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
761 | struct flowi *fl, struct xfrm_tmpl *tmpl, |
762 | struct xfrm_policy *pol, int *err, | |
763 | unsigned short family) | |
764 | { | |
5447c5e4 | 765 | struct net *net = xp_net(pol); |
4bda4f25 | 766 | unsigned int h; |
8f126e37 | 767 | struct hlist_node *entry; |
37b08e34 | 768 | struct xfrm_state *x, *x0, *to_put; |
1da177e4 LT |
769 | int acquire_in_progress = 0; |
770 | int error = 0; | |
771 | struct xfrm_state *best = NULL; | |
a716c119 | 772 | |
37b08e34 DM |
773 | to_put = NULL; |
774 | ||
1da177e4 | 775 | spin_lock_bh(&xfrm_state_lock); |
5447c5e4 AD |
776 | h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, family); |
777 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
1da177e4 LT |
778 | if (x->props.family == family && |
779 | x->props.reqid == tmpl->reqid && | |
fbd9a5b4 | 780 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
1da177e4 LT |
781 | xfrm_state_addr_check(x, daddr, saddr, family) && |
782 | tmpl->mode == x->props.mode && | |
783 | tmpl->id.proto == x->id.proto && | |
784 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) { | |
785 | /* Resolution logic: | |
786 | 1. There is a valid state with matching selector. | |
787 | Done. | |
788 | 2. Valid state with inappropriate selector. Skip. | |
789 | ||
790 | Entering area of "sysdeps". | |
791 | ||
792 | 3. If state is not valid, selector is temporary, | |
793 | it selects only session which triggered | |
794 | previous resolution. Key manager will do | |
795 | something to install a state with proper | |
796 | selector. | |
797 | */ | |
798 | if (x->km.state == XFRM_STATE_VALID) { | |
df9dcb45 | 799 | if ((x->sel.family && !xfrm_selector_match(&x->sel, fl, x->sel.family)) || |
e0d1caa7 | 800 | !security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
801 | continue; |
802 | if (!best || | |
803 | best->km.dying > x->km.dying || | |
804 | (best->km.dying == x->km.dying && | |
805 | best->curlft.add_time < x->curlft.add_time)) | |
806 | best = x; | |
807 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
808 | acquire_in_progress = 1; | |
809 | } else if (x->km.state == XFRM_STATE_ERROR || | |
810 | x->km.state == XFRM_STATE_EXPIRED) { | |
48b8d783 | 811 | if (xfrm_selector_match(&x->sel, fl, x->sel.family) && |
e0d1caa7 | 812 | security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
813 | error = -ESRCH; |
814 | } | |
815 | } | |
816 | } | |
817 | ||
818 | x = best; | |
819 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 820 | if (tmpl->id.spi && |
5447c5e4 | 821 | (x0 = __xfrm_state_lookup(net, daddr, tmpl->id.spi, |
edcd5821 | 822 | tmpl->id.proto, family)) != NULL) { |
37b08e34 | 823 | to_put = x0; |
1da177e4 LT |
824 | error = -EEXIST; |
825 | goto out; | |
826 | } | |
5447c5e4 | 827 | x = xfrm_state_alloc(net); |
1da177e4 LT |
828 | if (x == NULL) { |
829 | error = -ENOMEM; | |
830 | goto out; | |
831 | } | |
832 | /* Initialize temporary selector matching only | |
833 | * to current session. */ | |
834 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
835 | ||
e0d1caa7 VY |
836 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
837 | if (error) { | |
838 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 839 | to_put = x; |
e0d1caa7 VY |
840 | x = NULL; |
841 | goto out; | |
842 | } | |
843 | ||
1da177e4 LT |
844 | if (km_query(x, tmpl, pol) == 0) { |
845 | x->km.state = XFRM_STATE_ACQ; | |
5447c5e4 AD |
846 | list_add(&x->km.all, &net->xfrm.state_all); |
847 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
848 | h = xfrm_src_hash(net, daddr, saddr, family); | |
849 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
1da177e4 | 850 | if (x->id.spi) { |
5447c5e4 AD |
851 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, family); |
852 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 853 | } |
01e67d08 DM |
854 | x->lft.hard_add_expires_seconds = sysctl_xfrm_acq_expires; |
855 | x->timer.expires = jiffies + sysctl_xfrm_acq_expires*HZ; | |
1da177e4 | 856 | add_timer(&x->timer); |
5447c5e4 AD |
857 | net->xfrm.state_num++; |
858 | xfrm_hash_grow_check(net, x->bydst.next != NULL); | |
1da177e4 LT |
859 | } else { |
860 | x->km.state = XFRM_STATE_DEAD; | |
37b08e34 | 861 | to_put = x; |
1da177e4 LT |
862 | x = NULL; |
863 | error = -ESRCH; | |
864 | } | |
865 | } | |
866 | out: | |
867 | if (x) | |
868 | xfrm_state_hold(x); | |
869 | else | |
870 | *err = acquire_in_progress ? -EAGAIN : error; | |
871 | spin_unlock_bh(&xfrm_state_lock); | |
37b08e34 DM |
872 | if (to_put) |
873 | xfrm_state_put(to_put); | |
1da177e4 LT |
874 | return x; |
875 | } | |
876 | ||
628529b6 | 877 | struct xfrm_state * |
5447c5e4 AD |
878 | xfrm_stateonly_find(struct net *net, |
879 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
628529b6 JHS |
880 | unsigned short family, u8 mode, u8 proto, u32 reqid) |
881 | { | |
4bda4f25 | 882 | unsigned int h; |
628529b6 JHS |
883 | struct xfrm_state *rx = NULL, *x = NULL; |
884 | struct hlist_node *entry; | |
885 | ||
886 | spin_lock(&xfrm_state_lock); | |
5447c5e4 AD |
887 | h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
888 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
628529b6 JHS |
889 | if (x->props.family == family && |
890 | x->props.reqid == reqid && | |
891 | !(x->props.flags & XFRM_STATE_WILDRECV) && | |
892 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
893 | mode == x->props.mode && | |
894 | proto == x->id.proto && | |
895 | x->km.state == XFRM_STATE_VALID) { | |
896 | rx = x; | |
897 | break; | |
898 | } | |
899 | } | |
900 | ||
901 | if (rx) | |
902 | xfrm_state_hold(rx); | |
903 | spin_unlock(&xfrm_state_lock); | |
904 | ||
905 | ||
906 | return rx; | |
907 | } | |
908 | EXPORT_SYMBOL(xfrm_stateonly_find); | |
909 | ||
1da177e4 LT |
910 | static void __xfrm_state_insert(struct xfrm_state *x) |
911 | { | |
98806f75 | 912 | struct net *net = xs_net(x); |
a624c108 | 913 | unsigned int h; |
1da177e4 | 914 | |
9d4a706d DM |
915 | x->genid = ++xfrm_state_genid; |
916 | ||
98806f75 | 917 | list_add(&x->km.all, &net->xfrm.state_all); |
4c563f76 | 918 | |
98806f75 | 919 | h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, |
c1969f29 | 920 | x->props.reqid, x->props.family); |
98806f75 | 921 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); |
1da177e4 | 922 | |
98806f75 AD |
923 | h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); |
924 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
1da177e4 | 925 | |
7b4dc360 | 926 | if (x->id.spi) { |
98806f75 | 927 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, |
6c44e6b7 MN |
928 | x->props.family); |
929 | ||
98806f75 | 930 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); |
6c44e6b7 MN |
931 | } |
932 | ||
a47f0ce0 DM |
933 | mod_timer(&x->timer, jiffies + HZ); |
934 | if (x->replay_maxage) | |
935 | mod_timer(&x->rtimer, jiffies + x->replay_maxage); | |
f8cd5488 | 936 | |
98806f75 | 937 | wake_up(&net->xfrm.km_waitq); |
f034b5d4 | 938 | |
98806f75 | 939 | net->xfrm.state_num++; |
f034b5d4 | 940 | |
98806f75 | 941 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
1da177e4 LT |
942 | } |
943 | ||
c7f5ea3a DM |
944 | /* xfrm_state_lock is held */ |
945 | static void __xfrm_state_bump_genids(struct xfrm_state *xnew) | |
946 | { | |
98806f75 | 947 | struct net *net = xs_net(xnew); |
c7f5ea3a DM |
948 | unsigned short family = xnew->props.family; |
949 | u32 reqid = xnew->props.reqid; | |
950 | struct xfrm_state *x; | |
951 | struct hlist_node *entry; | |
952 | unsigned int h; | |
953 | ||
98806f75 AD |
954 | h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); |
955 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { | |
c7f5ea3a DM |
956 | if (x->props.family == family && |
957 | x->props.reqid == reqid && | |
c1969f29 DM |
958 | !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && |
959 | !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) | |
c7f5ea3a DM |
960 | x->genid = xfrm_state_genid; |
961 | } | |
962 | } | |
963 | ||
1da177e4 LT |
964 | void xfrm_state_insert(struct xfrm_state *x) |
965 | { | |
966 | spin_lock_bh(&xfrm_state_lock); | |
c7f5ea3a | 967 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
968 | __xfrm_state_insert(x); |
969 | spin_unlock_bh(&xfrm_state_lock); | |
970 | } | |
971 | EXPORT_SYMBOL(xfrm_state_insert); | |
972 | ||
2770834c | 973 | /* xfrm_state_lock is held */ |
5447c5e4 | 974 | static struct xfrm_state *__find_acq_core(struct net *net, unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create) |
2770834c | 975 | { |
5447c5e4 | 976 | unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); |
8f126e37 | 977 | struct hlist_node *entry; |
2770834c DM |
978 | struct xfrm_state *x; |
979 | ||
5447c5e4 | 980 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) { |
2770834c DM |
981 | if (x->props.reqid != reqid || |
982 | x->props.mode != mode || | |
983 | x->props.family != family || | |
984 | x->km.state != XFRM_STATE_ACQ || | |
75e252d9 JL |
985 | x->id.spi != 0 || |
986 | x->id.proto != proto) | |
2770834c DM |
987 | continue; |
988 | ||
989 | switch (family) { | |
990 | case AF_INET: | |
991 | if (x->id.daddr.a4 != daddr->a4 || | |
992 | x->props.saddr.a4 != saddr->a4) | |
993 | continue; | |
994 | break; | |
995 | case AF_INET6: | |
996 | if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6, | |
997 | (struct in6_addr *)daddr) || | |
998 | !ipv6_addr_equal((struct in6_addr *) | |
999 | x->props.saddr.a6, | |
1000 | (struct in6_addr *)saddr)) | |
1001 | continue; | |
1002 | break; | |
3ff50b79 | 1003 | } |
2770834c DM |
1004 | |
1005 | xfrm_state_hold(x); | |
1006 | return x; | |
1007 | } | |
1008 | ||
1009 | if (!create) | |
1010 | return NULL; | |
1011 | ||
5447c5e4 | 1012 | x = xfrm_state_alloc(net); |
2770834c DM |
1013 | if (likely(x)) { |
1014 | switch (family) { | |
1015 | case AF_INET: | |
1016 | x->sel.daddr.a4 = daddr->a4; | |
1017 | x->sel.saddr.a4 = saddr->a4; | |
1018 | x->sel.prefixlen_d = 32; | |
1019 | x->sel.prefixlen_s = 32; | |
1020 | x->props.saddr.a4 = saddr->a4; | |
1021 | x->id.daddr.a4 = daddr->a4; | |
1022 | break; | |
1023 | ||
1024 | case AF_INET6: | |
1025 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
1026 | (struct in6_addr *)daddr); | |
1027 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
1028 | (struct in6_addr *)saddr); | |
1029 | x->sel.prefixlen_d = 128; | |
1030 | x->sel.prefixlen_s = 128; | |
1031 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
1032 | (struct in6_addr *)saddr); | |
1033 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
1034 | (struct in6_addr *)daddr); | |
1035 | break; | |
3ff50b79 | 1036 | } |
2770834c DM |
1037 | |
1038 | x->km.state = XFRM_STATE_ACQ; | |
1039 | x->id.proto = proto; | |
1040 | x->props.family = family; | |
1041 | x->props.mode = mode; | |
1042 | x->props.reqid = reqid; | |
01e67d08 | 1043 | x->lft.hard_add_expires_seconds = sysctl_xfrm_acq_expires; |
2770834c | 1044 | xfrm_state_hold(x); |
01e67d08 | 1045 | x->timer.expires = jiffies + sysctl_xfrm_acq_expires*HZ; |
2770834c | 1046 | add_timer(&x->timer); |
5447c5e4 AD |
1047 | list_add(&x->km.all, &net->xfrm.state_all); |
1048 | hlist_add_head(&x->bydst, net->xfrm.state_bydst+h); | |
1049 | h = xfrm_src_hash(net, daddr, saddr, family); | |
1050 | hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h); | |
918049f0 | 1051 | |
5447c5e4 | 1052 | net->xfrm.state_num++; |
918049f0 | 1053 | |
5447c5e4 | 1054 | xfrm_hash_grow_check(net, x->bydst.next != NULL); |
2770834c DM |
1055 | } |
1056 | ||
1057 | return x; | |
1058 | } | |
1059 | ||
5447c5e4 | 1060 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq); |
1da177e4 LT |
1061 | |
1062 | int xfrm_state_add(struct xfrm_state *x) | |
1063 | { | |
5447c5e4 | 1064 | struct net *net = xs_net(x); |
37b08e34 | 1065 | struct xfrm_state *x1, *to_put; |
1da177e4 LT |
1066 | int family; |
1067 | int err; | |
eb2971b6 | 1068 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
1069 | |
1070 | family = x->props.family; | |
1da177e4 | 1071 | |
37b08e34 DM |
1072 | to_put = NULL; |
1073 | ||
1da177e4 LT |
1074 | spin_lock_bh(&xfrm_state_lock); |
1075 | ||
edcd5821 | 1076 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 | 1077 | if (x1) { |
37b08e34 | 1078 | to_put = x1; |
1da177e4 LT |
1079 | x1 = NULL; |
1080 | err = -EEXIST; | |
1081 | goto out; | |
1082 | } | |
1083 | ||
eb2971b6 | 1084 | if (use_spi && x->km.seq) { |
5447c5e4 | 1085 | x1 = __xfrm_find_acq_byseq(net, x->km.seq); |
75e252d9 JL |
1086 | if (x1 && ((x1->id.proto != x->id.proto) || |
1087 | xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) { | |
37b08e34 | 1088 | to_put = x1; |
1da177e4 LT |
1089 | x1 = NULL; |
1090 | } | |
1091 | } | |
1092 | ||
eb2971b6 | 1093 | if (use_spi && !x1) |
5447c5e4 | 1094 | x1 = __find_acq_core(net, family, x->props.mode, x->props.reqid, |
2770834c DM |
1095 | x->id.proto, |
1096 | &x->id.daddr, &x->props.saddr, 0); | |
1da177e4 | 1097 | |
c7f5ea3a | 1098 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
1099 | __xfrm_state_insert(x); |
1100 | err = 0; | |
1101 | ||
1102 | out: | |
1103 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
1104 | |
1105 | if (x1) { | |
1106 | xfrm_state_delete(x1); | |
1107 | xfrm_state_put(x1); | |
1108 | } | |
1109 | ||
37b08e34 DM |
1110 | if (to_put) |
1111 | xfrm_state_put(to_put); | |
1112 | ||
1da177e4 LT |
1113 | return err; |
1114 | } | |
1115 | EXPORT_SYMBOL(xfrm_state_add); | |
1116 | ||
80c9abaa | 1117 | #ifdef CONFIG_XFRM_MIGRATE |
6666351d | 1118 | static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp) |
80c9abaa | 1119 | { |
98806f75 | 1120 | struct net *net = xs_net(orig); |
80c9abaa | 1121 | int err = -ENOMEM; |
98806f75 | 1122 | struct xfrm_state *x = xfrm_state_alloc(net); |
80c9abaa SS |
1123 | if (!x) |
1124 | goto error; | |
1125 | ||
1126 | memcpy(&x->id, &orig->id, sizeof(x->id)); | |
1127 | memcpy(&x->sel, &orig->sel, sizeof(x->sel)); | |
1128 | memcpy(&x->lft, &orig->lft, sizeof(x->lft)); | |
1129 | x->props.mode = orig->props.mode; | |
1130 | x->props.replay_window = orig->props.replay_window; | |
1131 | x->props.reqid = orig->props.reqid; | |
1132 | x->props.family = orig->props.family; | |
1133 | x->props.saddr = orig->props.saddr; | |
1134 | ||
1135 | if (orig->aalg) { | |
1136 | x->aalg = xfrm_algo_clone(orig->aalg); | |
1137 | if (!x->aalg) | |
1138 | goto error; | |
1139 | } | |
1140 | x->props.aalgo = orig->props.aalgo; | |
1141 | ||
1142 | if (orig->ealg) { | |
1143 | x->ealg = xfrm_algo_clone(orig->ealg); | |
1144 | if (!x->ealg) | |
1145 | goto error; | |
1146 | } | |
1147 | x->props.ealgo = orig->props.ealgo; | |
1148 | ||
1149 | if (orig->calg) { | |
1150 | x->calg = xfrm_algo_clone(orig->calg); | |
1151 | if (!x->calg) | |
1152 | goto error; | |
1153 | } | |
1154 | x->props.calgo = orig->props.calgo; | |
1155 | ||
a716c119 | 1156 | if (orig->encap) { |
80c9abaa SS |
1157 | x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL); |
1158 | if (!x->encap) | |
1159 | goto error; | |
1160 | } | |
1161 | ||
1162 | if (orig->coaddr) { | |
1163 | x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), | |
1164 | GFP_KERNEL); | |
1165 | if (!x->coaddr) | |
1166 | goto error; | |
1167 | } | |
1168 | ||
1169 | err = xfrm_init_state(x); | |
1170 | if (err) | |
1171 | goto error; | |
1172 | ||
1173 | x->props.flags = orig->props.flags; | |
1174 | ||
1175 | x->curlft.add_time = orig->curlft.add_time; | |
1176 | x->km.state = orig->km.state; | |
1177 | x->km.seq = orig->km.seq; | |
1178 | ||
1179 | return x; | |
1180 | ||
1181 | error: | |
1182 | if (errp) | |
1183 | *errp = err; | |
1184 | if (x) { | |
1185 | kfree(x->aalg); | |
1186 | kfree(x->ealg); | |
1187 | kfree(x->calg); | |
1188 | kfree(x->encap); | |
1189 | kfree(x->coaddr); | |
1190 | } | |
1191 | kfree(x); | |
1192 | return NULL; | |
1193 | } | |
80c9abaa SS |
1194 | |
1195 | /* xfrm_state_lock is held */ | |
1196 | struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m) | |
1197 | { | |
1198 | unsigned int h; | |
1199 | struct xfrm_state *x; | |
1200 | struct hlist_node *entry; | |
1201 | ||
1202 | if (m->reqid) { | |
64d0cd00 | 1203 | h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1204 | m->reqid, m->old_family); |
73d189dc | 1205 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) { |
80c9abaa SS |
1206 | if (x->props.mode != m->mode || |
1207 | x->id.proto != m->proto) | |
1208 | continue; | |
1209 | if (m->reqid && x->props.reqid != m->reqid) | |
1210 | continue; | |
1211 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1212 | m->old_family) || | |
1213 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1214 | m->old_family)) | |
1215 | continue; | |
1216 | xfrm_state_hold(x); | |
1217 | return x; | |
1218 | } | |
1219 | } else { | |
64d0cd00 | 1220 | h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr, |
80c9abaa | 1221 | m->old_family); |
d320bbb3 | 1222 | hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) { |
80c9abaa SS |
1223 | if (x->props.mode != m->mode || |
1224 | x->id.proto != m->proto) | |
1225 | continue; | |
1226 | if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr, | |
1227 | m->old_family) || | |
1228 | xfrm_addr_cmp(&x->props.saddr, &m->old_saddr, | |
1229 | m->old_family)) | |
1230 | continue; | |
1231 | xfrm_state_hold(x); | |
1232 | return x; | |
1233 | } | |
1234 | } | |
1235 | ||
a716c119 | 1236 | return NULL; |
80c9abaa SS |
1237 | } |
1238 | EXPORT_SYMBOL(xfrm_migrate_state_find); | |
1239 | ||
1240 | struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, | |
1241 | struct xfrm_migrate *m) | |
1242 | { | |
1243 | struct xfrm_state *xc; | |
1244 | int err; | |
1245 | ||
1246 | xc = xfrm_state_clone(x, &err); | |
1247 | if (!xc) | |
1248 | return NULL; | |
1249 | ||
1250 | memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); | |
1251 | memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); | |
1252 | ||
1253 | /* add state */ | |
1254 | if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) { | |
1255 | /* a care is needed when the destination address of the | |
1256 | state is to be updated as it is a part of triplet */ | |
1257 | xfrm_state_insert(xc); | |
1258 | } else { | |
1259 | if ((err = xfrm_state_add(xc)) < 0) | |
1260 | goto error; | |
1261 | } | |
1262 | ||
1263 | return xc; | |
1264 | error: | |
1265 | kfree(xc); | |
1266 | return NULL; | |
1267 | } | |
1268 | EXPORT_SYMBOL(xfrm_state_migrate); | |
1269 | #endif | |
1270 | ||
1da177e4 LT |
1271 | int xfrm_state_update(struct xfrm_state *x) |
1272 | { | |
37b08e34 | 1273 | struct xfrm_state *x1, *to_put; |
1da177e4 | 1274 | int err; |
eb2971b6 | 1275 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 1276 | |
37b08e34 DM |
1277 | to_put = NULL; |
1278 | ||
1da177e4 | 1279 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 1280 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
1281 | |
1282 | err = -ESRCH; | |
1283 | if (!x1) | |
1284 | goto out; | |
1285 | ||
1286 | if (xfrm_state_kern(x1)) { | |
37b08e34 | 1287 | to_put = x1; |
1da177e4 LT |
1288 | err = -EEXIST; |
1289 | goto out; | |
1290 | } | |
1291 | ||
1292 | if (x1->km.state == XFRM_STATE_ACQ) { | |
1293 | __xfrm_state_insert(x); | |
1294 | x = NULL; | |
1295 | } | |
1296 | err = 0; | |
1297 | ||
1298 | out: | |
1299 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 | 1300 | |
37b08e34 DM |
1301 | if (to_put) |
1302 | xfrm_state_put(to_put); | |
1303 | ||
1da177e4 LT |
1304 | if (err) |
1305 | return err; | |
1306 | ||
1307 | if (!x) { | |
1308 | xfrm_state_delete(x1); | |
1309 | xfrm_state_put(x1); | |
1310 | return 0; | |
1311 | } | |
1312 | ||
1313 | err = -EINVAL; | |
1314 | spin_lock_bh(&x1->lock); | |
1315 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
1316 | if (x->encap && x1->encap) | |
1317 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
1318 | if (x->coaddr && x1->coaddr) { |
1319 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
1320 | } | |
1321 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
1322 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
1323 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
1324 | x1->km.dying = 0; | |
1325 | ||
a47f0ce0 | 1326 | mod_timer(&x1->timer, jiffies + HZ); |
1da177e4 LT |
1327 | if (x1->curlft.use_time) |
1328 | xfrm_state_check_expire(x1); | |
1329 | ||
1330 | err = 0; | |
1331 | } | |
1332 | spin_unlock_bh(&x1->lock); | |
1333 | ||
1334 | xfrm_state_put(x1); | |
1335 | ||
1336 | return err; | |
1337 | } | |
1338 | EXPORT_SYMBOL(xfrm_state_update); | |
1339 | ||
1340 | int xfrm_state_check_expire(struct xfrm_state *x) | |
1341 | { | |
1342 | if (!x->curlft.use_time) | |
9d729f72 | 1343 | x->curlft.use_time = get_seconds(); |
1da177e4 LT |
1344 | |
1345 | if (x->km.state != XFRM_STATE_VALID) | |
1346 | return -EINVAL; | |
1347 | ||
1348 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
1349 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 1350 | x->km.state = XFRM_STATE_EXPIRED; |
a47f0ce0 | 1351 | mod_timer(&x->timer, jiffies); |
1da177e4 LT |
1352 | return -EINVAL; |
1353 | } | |
1354 | ||
1355 | if (!x->km.dying && | |
1356 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
1357 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
1358 | x->km.dying = 1; | |
53bc6b4d | 1359 | km_state_expired(x, 0, 0); |
4666faab | 1360 | } |
1da177e4 LT |
1361 | return 0; |
1362 | } | |
1363 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
1364 | ||
1da177e4 | 1365 | struct xfrm_state * |
221df1ed | 1366 | xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, |
1da177e4 LT |
1367 | unsigned short family) |
1368 | { | |
1369 | struct xfrm_state *x; | |
1da177e4 LT |
1370 | |
1371 | spin_lock_bh(&xfrm_state_lock); | |
221df1ed | 1372 | x = __xfrm_state_lookup(net, daddr, spi, proto, family); |
1da177e4 | 1373 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
1374 | return x; |
1375 | } | |
1376 | EXPORT_SYMBOL(xfrm_state_lookup); | |
1377 | ||
1378 | struct xfrm_state * | |
221df1ed AD |
1379 | xfrm_state_lookup_byaddr(struct net *net, |
1380 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
eb2971b6 MN |
1381 | u8 proto, unsigned short family) |
1382 | { | |
1383 | struct xfrm_state *x; | |
eb2971b6 MN |
1384 | |
1385 | spin_lock_bh(&xfrm_state_lock); | |
221df1ed | 1386 | x = __xfrm_state_lookup_byaddr(net, daddr, saddr, proto, family); |
eb2971b6 | 1387 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
1388 | return x; |
1389 | } | |
1390 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
1391 | ||
1392 | struct xfrm_state * | |
5447c5e4 | 1393 | xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto, |
a716c119 | 1394 | xfrm_address_t *daddr, xfrm_address_t *saddr, |
1da177e4 LT |
1395 | int create, unsigned short family) |
1396 | { | |
1397 | struct xfrm_state *x; | |
1da177e4 LT |
1398 | |
1399 | spin_lock_bh(&xfrm_state_lock); | |
5447c5e4 | 1400 | x = __find_acq_core(net, family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 1401 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 1402 | |
1da177e4 LT |
1403 | return x; |
1404 | } | |
1405 | EXPORT_SYMBOL(xfrm_find_acq); | |
1406 | ||
41a49cc3 MN |
1407 | #ifdef CONFIG_XFRM_SUB_POLICY |
1408 | int | |
1409 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
1410 | unsigned short family) | |
1411 | { | |
1412 | int err = 0; | |
1413 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1414 | if (!afinfo) | |
1415 | return -EAFNOSUPPORT; | |
1416 | ||
1417 | spin_lock_bh(&xfrm_state_lock); | |
1418 | if (afinfo->tmpl_sort) | |
1419 | err = afinfo->tmpl_sort(dst, src, n); | |
1420 | spin_unlock_bh(&xfrm_state_lock); | |
1421 | xfrm_state_put_afinfo(afinfo); | |
1422 | return err; | |
1423 | } | |
1424 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
1425 | ||
1426 | int | |
1427 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
1428 | unsigned short family) | |
1429 | { | |
1430 | int err = 0; | |
1431 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1432 | if (!afinfo) | |
1433 | return -EAFNOSUPPORT; | |
1434 | ||
1435 | spin_lock_bh(&xfrm_state_lock); | |
1436 | if (afinfo->state_sort) | |
1437 | err = afinfo->state_sort(dst, src, n); | |
1438 | spin_unlock_bh(&xfrm_state_lock); | |
1439 | xfrm_state_put_afinfo(afinfo); | |
1440 | return err; | |
1441 | } | |
1442 | EXPORT_SYMBOL(xfrm_state_sort); | |
1443 | #endif | |
1444 | ||
1da177e4 LT |
1445 | /* Silly enough, but I'm lazy to build resolution list */ |
1446 | ||
5447c5e4 | 1447 | static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq) |
1da177e4 LT |
1448 | { |
1449 | int i; | |
1da177e4 | 1450 | |
5447c5e4 | 1451 | for (i = 0; i <= net->xfrm.state_hmask; i++) { |
8f126e37 DM |
1452 | struct hlist_node *entry; |
1453 | struct xfrm_state *x; | |
1454 | ||
5447c5e4 | 1455 | hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) { |
8f126e37 DM |
1456 | if (x->km.seq == seq && |
1457 | x->km.state == XFRM_STATE_ACQ) { | |
1da177e4 LT |
1458 | xfrm_state_hold(x); |
1459 | return x; | |
1460 | } | |
1461 | } | |
1462 | } | |
1463 | return NULL; | |
1464 | } | |
1465 | ||
5447c5e4 | 1466 | struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq) |
1da177e4 LT |
1467 | { |
1468 | struct xfrm_state *x; | |
1469 | ||
1470 | spin_lock_bh(&xfrm_state_lock); | |
5447c5e4 | 1471 | x = __xfrm_find_acq_byseq(net, seq); |
1da177e4 LT |
1472 | spin_unlock_bh(&xfrm_state_lock); |
1473 | return x; | |
1474 | } | |
1475 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1476 | ||
1477 | u32 xfrm_get_acqseq(void) | |
1478 | { | |
1479 | u32 res; | |
1480 | static u32 acqseq; | |
1481 | static DEFINE_SPINLOCK(acqseq_lock); | |
1482 | ||
1483 | spin_lock_bh(&acqseq_lock); | |
1484 | res = (++acqseq ? : ++acqseq); | |
1485 | spin_unlock_bh(&acqseq_lock); | |
1486 | return res; | |
1487 | } | |
1488 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1489 | ||
658b219e | 1490 | int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) |
1da177e4 | 1491 | { |
221df1ed | 1492 | struct net *net = xs_net(x); |
f034b5d4 | 1493 | unsigned int h; |
1da177e4 | 1494 | struct xfrm_state *x0; |
658b219e HX |
1495 | int err = -ENOENT; |
1496 | __be32 minspi = htonl(low); | |
1497 | __be32 maxspi = htonl(high); | |
1da177e4 | 1498 | |
658b219e HX |
1499 | spin_lock_bh(&x->lock); |
1500 | if (x->km.state == XFRM_STATE_DEAD) | |
1501 | goto unlock; | |
1502 | ||
1503 | err = 0; | |
1da177e4 | 1504 | if (x->id.spi) |
658b219e HX |
1505 | goto unlock; |
1506 | ||
1507 | err = -ENOENT; | |
1da177e4 LT |
1508 | |
1509 | if (minspi == maxspi) { | |
221df1ed | 1510 | x0 = xfrm_state_lookup(net, &x->id.daddr, minspi, x->id.proto, x->props.family); |
1da177e4 LT |
1511 | if (x0) { |
1512 | xfrm_state_put(x0); | |
658b219e | 1513 | goto unlock; |
1da177e4 LT |
1514 | } |
1515 | x->id.spi = minspi; | |
1516 | } else { | |
1517 | u32 spi = 0; | |
26977b4e AV |
1518 | for (h=0; h<high-low+1; h++) { |
1519 | spi = low + net_random()%(high-low+1); | |
221df1ed | 1520 | x0 = xfrm_state_lookup(net, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
1da177e4 LT |
1521 | if (x0 == NULL) { |
1522 | x->id.spi = htonl(spi); | |
1523 | break; | |
1524 | } | |
1525 | xfrm_state_put(x0); | |
1526 | } | |
1527 | } | |
1528 | if (x->id.spi) { | |
1529 | spin_lock_bh(&xfrm_state_lock); | |
12604d8a AD |
1530 | h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); |
1531 | hlist_add_head(&x->byspi, net->xfrm.state_byspi+h); | |
1da177e4 | 1532 | spin_unlock_bh(&xfrm_state_lock); |
658b219e HX |
1533 | |
1534 | err = 0; | |
1da177e4 | 1535 | } |
658b219e HX |
1536 | |
1537 | unlock: | |
1538 | spin_unlock_bh(&x->lock); | |
1539 | ||
1540 | return err; | |
1da177e4 LT |
1541 | } |
1542 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1543 | ||
284fa7da | 1544 | int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, |
4c563f76 | 1545 | int (*func)(struct xfrm_state *, int, void*), |
1da177e4 LT |
1546 | void *data) |
1547 | { | |
12a169e7 HX |
1548 | struct xfrm_state *state; |
1549 | struct xfrm_state_walk *x; | |
1da177e4 LT |
1550 | int err = 0; |
1551 | ||
12a169e7 | 1552 | if (walk->seq != 0 && list_empty(&walk->all)) |
4c563f76 TT |
1553 | return 0; |
1554 | ||
1da177e4 | 1555 | spin_lock_bh(&xfrm_state_lock); |
12a169e7 | 1556 | if (list_empty(&walk->all)) |
284fa7da | 1557 | x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); |
12a169e7 HX |
1558 | else |
1559 | x = list_entry(&walk->all, struct xfrm_state_walk, all); | |
284fa7da | 1560 | list_for_each_entry_from(x, &net->xfrm.state_all, all) { |
12a169e7 | 1561 | if (x->state == XFRM_STATE_DEAD) |
4c563f76 | 1562 | continue; |
12a169e7 HX |
1563 | state = container_of(x, struct xfrm_state, km); |
1564 | if (!xfrm_id_proto_match(state->id.proto, walk->proto)) | |
4c563f76 | 1565 | continue; |
12a169e7 HX |
1566 | err = func(state, walk->seq, data); |
1567 | if (err) { | |
1568 | list_move_tail(&walk->all, &x->all); | |
1569 | goto out; | |
1da177e4 | 1570 | } |
12a169e7 | 1571 | walk->seq++; |
1da177e4 | 1572 | } |
12a169e7 | 1573 | if (walk->seq == 0) { |
1da177e4 LT |
1574 | err = -ENOENT; |
1575 | goto out; | |
1576 | } | |
12a169e7 | 1577 | list_del_init(&walk->all); |
1da177e4 LT |
1578 | out: |
1579 | spin_unlock_bh(&xfrm_state_lock); | |
1580 | return err; | |
1581 | } | |
1582 | EXPORT_SYMBOL(xfrm_state_walk); | |
1583 | ||
5c182458 HX |
1584 | void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto) |
1585 | { | |
12a169e7 | 1586 | INIT_LIST_HEAD(&walk->all); |
5c182458 | 1587 | walk->proto = proto; |
12a169e7 HX |
1588 | walk->state = XFRM_STATE_DEAD; |
1589 | walk->seq = 0; | |
5c182458 HX |
1590 | } |
1591 | EXPORT_SYMBOL(xfrm_state_walk_init); | |
1592 | ||
abb81c4f HX |
1593 | void xfrm_state_walk_done(struct xfrm_state_walk *walk) |
1594 | { | |
12a169e7 | 1595 | if (list_empty(&walk->all)) |
5c182458 | 1596 | return; |
5c182458 | 1597 | |
12a169e7 HX |
1598 | spin_lock_bh(&xfrm_state_lock); |
1599 | list_del(&walk->all); | |
1600 | spin_lock_bh(&xfrm_state_lock); | |
abb81c4f HX |
1601 | } |
1602 | EXPORT_SYMBOL(xfrm_state_walk_done); | |
1603 | ||
f8cd5488 JHS |
1604 | |
1605 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
1606 | { | |
1607 | struct km_event c; | |
1608 | /* we send notify messages in case | |
1609 | * 1. we updated on of the sequence numbers, and the seqno difference | |
1610 | * is at least x->replay_maxdiff, in this case we also update the | |
1611 | * timeout of our timer function | |
1612 | * 2. if x->replay_maxage has elapsed since last update, | |
1613 | * and there were changes | |
1614 | * | |
1615 | * The state structure must be locked! | |
1616 | */ | |
1617 | ||
1618 | switch (event) { | |
1619 | case XFRM_REPLAY_UPDATE: | |
1620 | if (x->replay_maxdiff && | |
1621 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
1622 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
1623 | if (x->xflags & XFRM_TIME_DEFER) | |
1624 | event = XFRM_REPLAY_TIMEOUT; | |
1625 | else | |
1626 | return; | |
1627 | } | |
f8cd5488 JHS |
1628 | |
1629 | break; | |
1630 | ||
1631 | case XFRM_REPLAY_TIMEOUT: | |
1632 | if ((x->replay.seq == x->preplay.seq) && | |
1633 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1634 | (x->replay.oseq == x->preplay.oseq)) { |
1635 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1636 | return; |
2717096a | 1637 | } |
f8cd5488 JHS |
1638 | |
1639 | break; | |
1640 | } | |
1641 | ||
1642 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1643 | c.event = XFRM_MSG_NEWAE; | |
1644 | c.data.aevent = event; | |
1645 | km_state_notify(x, &c); | |
1646 | ||
f8cd5488 | 1647 | if (x->replay_maxage && |
a47f0ce0 | 1648 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
2717096a | 1649 | x->xflags &= ~XFRM_TIME_DEFER; |
f8cd5488 JHS |
1650 | } |
1651 | ||
1652 | static void xfrm_replay_timer_handler(unsigned long data) | |
1653 | { | |
1654 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1655 | ||
1656 | spin_lock(&x->lock); | |
1657 | ||
2717096a | 1658 | if (x->km.state == XFRM_STATE_VALID) { |
a6483b79 | 1659 | if (xfrm_aevent_is_on(xs_net(x))) |
2717096a JHS |
1660 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); |
1661 | else | |
1662 | x->xflags |= XFRM_TIME_DEFER; | |
1663 | } | |
f8cd5488 JHS |
1664 | |
1665 | spin_unlock(&x->lock); | |
1666 | } | |
1667 | ||
afeb14b4 PM |
1668 | int xfrm_replay_check(struct xfrm_state *x, |
1669 | struct sk_buff *skb, __be32 net_seq) | |
1da177e4 LT |
1670 | { |
1671 | u32 diff; | |
a252cc23 | 1672 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1673 | |
1674 | if (unlikely(seq == 0)) | |
afeb14b4 | 1675 | goto err; |
1da177e4 LT |
1676 | |
1677 | if (likely(seq > x->replay.seq)) | |
1678 | return 0; | |
1679 | ||
1680 | diff = x->replay.seq - seq; | |
4c4d51a7 HX |
1681 | if (diff >= min_t(unsigned int, x->props.replay_window, |
1682 | sizeof(x->replay.bitmap) * 8)) { | |
1da177e4 | 1683 | x->stats.replay_window++; |
afeb14b4 | 1684 | goto err; |
1da177e4 LT |
1685 | } |
1686 | ||
1687 | if (x->replay.bitmap & (1U << diff)) { | |
1688 | x->stats.replay++; | |
afeb14b4 | 1689 | goto err; |
1da177e4 LT |
1690 | } |
1691 | return 0; | |
afeb14b4 PM |
1692 | |
1693 | err: | |
1694 | xfrm_audit_state_replay(x, skb, net_seq); | |
1695 | return -EINVAL; | |
1da177e4 | 1696 | } |
1da177e4 | 1697 | |
61f4627b | 1698 | void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq) |
1da177e4 LT |
1699 | { |
1700 | u32 diff; | |
61f4627b | 1701 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1702 | |
1703 | if (seq > x->replay.seq) { | |
1704 | diff = seq - x->replay.seq; | |
1705 | if (diff < x->props.replay_window) | |
1706 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1707 | else | |
1708 | x->replay.bitmap = 1; | |
1709 | x->replay.seq = seq; | |
1710 | } else { | |
1711 | diff = x->replay.seq - seq; | |
1712 | x->replay.bitmap |= (1U << diff); | |
1713 | } | |
f8cd5488 | 1714 | |
a6483b79 | 1715 | if (xfrm_aevent_is_on(xs_net(x))) |
f8cd5488 | 1716 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); |
1da177e4 | 1717 | } |
1da177e4 | 1718 | |
df01812e | 1719 | static LIST_HEAD(xfrm_km_list); |
1da177e4 LT |
1720 | static DEFINE_RWLOCK(xfrm_km_lock); |
1721 | ||
26b15dad | 1722 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1723 | { |
1724 | struct xfrm_mgr *km; | |
1725 | ||
26b15dad JHS |
1726 | read_lock(&xfrm_km_lock); |
1727 | list_for_each_entry(km, &xfrm_km_list, list) | |
1728 | if (km->notify_policy) | |
1729 | km->notify_policy(xp, dir, c); | |
1730 | read_unlock(&xfrm_km_lock); | |
1731 | } | |
1da177e4 | 1732 | |
26b15dad JHS |
1733 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
1734 | { | |
1735 | struct xfrm_mgr *km; | |
1da177e4 LT |
1736 | read_lock(&xfrm_km_lock); |
1737 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1738 | if (km->notify) |
1739 | km->notify(x, c); | |
1da177e4 | 1740 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1741 | } |
1742 | ||
1743 | EXPORT_SYMBOL(km_policy_notify); | |
1744 | EXPORT_SYMBOL(km_state_notify); | |
1745 | ||
53bc6b4d | 1746 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad | 1747 | { |
98806f75 | 1748 | struct net *net = xs_net(x); |
26b15dad JHS |
1749 | struct km_event c; |
1750 | ||
bf08867f | 1751 | c.data.hard = hard; |
53bc6b4d | 1752 | c.pid = pid; |
f60f6b8f | 1753 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1754 | km_state_notify(x, &c); |
1da177e4 LT |
1755 | |
1756 | if (hard) | |
98806f75 | 1757 | wake_up(&net->xfrm.km_waitq); |
1da177e4 LT |
1758 | } |
1759 | ||
53bc6b4d | 1760 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1761 | /* |
1762 | * We send to all registered managers regardless of failure | |
1763 | * We are happy with one success | |
1764 | */ | |
980ebd25 | 1765 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1766 | { |
26b15dad | 1767 | int err = -EINVAL, acqret; |
1da177e4 LT |
1768 | struct xfrm_mgr *km; |
1769 | ||
1770 | read_lock(&xfrm_km_lock); | |
1771 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1772 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1773 | if (!acqret) | |
1774 | err = acqret; | |
1da177e4 LT |
1775 | } |
1776 | read_unlock(&xfrm_km_lock); | |
1777 | return err; | |
1778 | } | |
980ebd25 | 1779 | EXPORT_SYMBOL(km_query); |
1da177e4 | 1780 | |
5d36b180 | 1781 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) |
1da177e4 LT |
1782 | { |
1783 | int err = -EINVAL; | |
1784 | struct xfrm_mgr *km; | |
1785 | ||
1786 | read_lock(&xfrm_km_lock); | |
1787 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1788 | if (km->new_mapping) | |
1789 | err = km->new_mapping(x, ipaddr, sport); | |
1790 | if (!err) | |
1791 | break; | |
1792 | } | |
1793 | read_unlock(&xfrm_km_lock); | |
1794 | return err; | |
1795 | } | |
1796 | EXPORT_SYMBOL(km_new_mapping); | |
1797 | ||
6c5c8ca7 | 1798 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1799 | { |
98806f75 | 1800 | struct net *net = xp_net(pol); |
26b15dad | 1801 | struct km_event c; |
1da177e4 | 1802 | |
bf08867f | 1803 | c.data.hard = hard; |
6c5c8ca7 | 1804 | c.pid = pid; |
f60f6b8f | 1805 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1806 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1807 | |
1808 | if (hard) | |
98806f75 | 1809 | wake_up(&net->xfrm.km_waitq); |
1da177e4 | 1810 | } |
a70fcb0b | 1811 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1812 | |
2d60abc2 | 1813 | #ifdef CONFIG_XFRM_MIGRATE |
80c9abaa | 1814 | int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 AE |
1815 | struct xfrm_migrate *m, int num_migrate, |
1816 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
1817 | { |
1818 | int err = -EINVAL; | |
1819 | int ret; | |
1820 | struct xfrm_mgr *km; | |
1821 | ||
1822 | read_lock(&xfrm_km_lock); | |
1823 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1824 | if (km->migrate) { | |
13c1d189 | 1825 | ret = km->migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
1826 | if (!ret) |
1827 | err = ret; | |
1828 | } | |
1829 | } | |
1830 | read_unlock(&xfrm_km_lock); | |
1831 | return err; | |
1832 | } | |
1833 | EXPORT_SYMBOL(km_migrate); | |
2d60abc2 | 1834 | #endif |
80c9abaa | 1835 | |
db983c11 | 1836 | int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
97a64b45 MN |
1837 | { |
1838 | int err = -EINVAL; | |
1839 | int ret; | |
1840 | struct xfrm_mgr *km; | |
1841 | ||
1842 | read_lock(&xfrm_km_lock); | |
1843 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1844 | if (km->report) { | |
db983c11 | 1845 | ret = km->report(net, proto, sel, addr); |
97a64b45 MN |
1846 | if (!ret) |
1847 | err = ret; | |
1848 | } | |
1849 | } | |
1850 | read_unlock(&xfrm_km_lock); | |
1851 | return err; | |
1852 | } | |
1853 | EXPORT_SYMBOL(km_report); | |
1854 | ||
1da177e4 LT |
1855 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1856 | { | |
1857 | int err; | |
1858 | u8 *data; | |
1859 | struct xfrm_mgr *km; | |
1860 | struct xfrm_policy *pol = NULL; | |
1861 | ||
1862 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1863 | return -EMSGSIZE; | |
1864 | ||
1865 | data = kmalloc(optlen, GFP_KERNEL); | |
1866 | if (!data) | |
1867 | return -ENOMEM; | |
1868 | ||
1869 | err = -EFAULT; | |
1870 | if (copy_from_user(data, optval, optlen)) | |
1871 | goto out; | |
1872 | ||
1873 | err = -EINVAL; | |
1874 | read_lock(&xfrm_km_lock); | |
1875 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1876 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1877 | optlen, &err); |
1878 | if (err >= 0) | |
1879 | break; | |
1880 | } | |
1881 | read_unlock(&xfrm_km_lock); | |
1882 | ||
1883 | if (err >= 0) { | |
1884 | xfrm_sk_policy_insert(sk, err, pol); | |
1885 | xfrm_pol_put(pol); | |
1886 | err = 0; | |
1887 | } | |
1888 | ||
1889 | out: | |
1890 | kfree(data); | |
1891 | return err; | |
1892 | } | |
1893 | EXPORT_SYMBOL(xfrm_user_policy); | |
1894 | ||
1895 | int xfrm_register_km(struct xfrm_mgr *km) | |
1896 | { | |
1897 | write_lock_bh(&xfrm_km_lock); | |
1898 | list_add_tail(&km->list, &xfrm_km_list); | |
1899 | write_unlock_bh(&xfrm_km_lock); | |
1900 | return 0; | |
1901 | } | |
1902 | EXPORT_SYMBOL(xfrm_register_km); | |
1903 | ||
1904 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1905 | { | |
1906 | write_lock_bh(&xfrm_km_lock); | |
1907 | list_del(&km->list); | |
1908 | write_unlock_bh(&xfrm_km_lock); | |
1909 | return 0; | |
1910 | } | |
1911 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1912 | ||
1913 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1914 | { | |
1915 | int err = 0; | |
1916 | if (unlikely(afinfo == NULL)) | |
1917 | return -EINVAL; | |
1918 | if (unlikely(afinfo->family >= NPROTO)) | |
1919 | return -EAFNOSUPPORT; | |
f3111502 | 1920 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1921 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1922 | err = -ENOBUFS; | |
edcd5821 | 1923 | else |
1da177e4 | 1924 | xfrm_state_afinfo[afinfo->family] = afinfo; |
f3111502 | 1925 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1926 | return err; |
1927 | } | |
1928 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1929 | ||
1930 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1931 | { | |
1932 | int err = 0; | |
1933 | if (unlikely(afinfo == NULL)) | |
1934 | return -EINVAL; | |
1935 | if (unlikely(afinfo->family >= NPROTO)) | |
1936 | return -EAFNOSUPPORT; | |
f3111502 | 1937 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1938 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1939 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1940 | err = -EINVAL; | |
edcd5821 | 1941 | else |
1da177e4 | 1942 | xfrm_state_afinfo[afinfo->family] = NULL; |
1da177e4 | 1943 | } |
f3111502 | 1944 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1945 | return err; |
1946 | } | |
1947 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1948 | ||
17c2a42a | 1949 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) |
1da177e4 LT |
1950 | { |
1951 | struct xfrm_state_afinfo *afinfo; | |
1952 | if (unlikely(family >= NPROTO)) | |
1953 | return NULL; | |
1954 | read_lock(&xfrm_state_afinfo_lock); | |
1955 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1956 | if (unlikely(!afinfo)) |
1957 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1958 | return afinfo; |
1959 | } | |
1960 | ||
17c2a42a | 1961 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) |
9a429c49 | 1962 | __releases(xfrm_state_afinfo_lock) |
1da177e4 | 1963 | { |
546be240 | 1964 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1965 | } |
1966 | ||
1967 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1968 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1969 | { | |
1970 | if (x->tunnel) { | |
1971 | struct xfrm_state *t = x->tunnel; | |
1972 | ||
1973 | if (atomic_read(&t->tunnel_users) == 2) | |
1974 | xfrm_state_delete(t); | |
1975 | atomic_dec(&t->tunnel_users); | |
1976 | xfrm_state_put(t); | |
1977 | x->tunnel = NULL; | |
1978 | } | |
1979 | } | |
1980 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1981 | ||
1982 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) | |
1983 | { | |
c5c25238 | 1984 | int res; |
1da177e4 | 1985 | |
c5c25238 PM |
1986 | spin_lock_bh(&x->lock); |
1987 | if (x->km.state == XFRM_STATE_VALID && | |
1988 | x->type && x->type->get_mtu) | |
1989 | res = x->type->get_mtu(x, mtu); | |
1990 | else | |
28121617 | 1991 | res = mtu - x->props.header_len; |
c5c25238 | 1992 | spin_unlock_bh(&x->lock); |
1da177e4 LT |
1993 | return res; |
1994 | } | |
1995 | ||
72cb6962 HX |
1996 | int xfrm_init_state(struct xfrm_state *x) |
1997 | { | |
d094cd83 | 1998 | struct xfrm_state_afinfo *afinfo; |
df9dcb45 | 1999 | struct xfrm_mode *inner_mode; |
d094cd83 | 2000 | int family = x->props.family; |
72cb6962 HX |
2001 | int err; |
2002 | ||
d094cd83 HX |
2003 | err = -EAFNOSUPPORT; |
2004 | afinfo = xfrm_state_get_afinfo(family); | |
2005 | if (!afinfo) | |
2006 | goto error; | |
2007 | ||
2008 | err = 0; | |
2009 | if (afinfo->init_flags) | |
2010 | err = afinfo->init_flags(x); | |
2011 | ||
2012 | xfrm_state_put_afinfo(afinfo); | |
2013 | ||
2014 | if (err) | |
2015 | goto error; | |
2016 | ||
2017 | err = -EPROTONOSUPPORT; | |
13996378 | 2018 | |
df9dcb45 KM |
2019 | if (x->sel.family != AF_UNSPEC) { |
2020 | inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); | |
2021 | if (inner_mode == NULL) | |
2022 | goto error; | |
2023 | ||
2024 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && | |
2025 | family != x->sel.family) { | |
2026 | xfrm_put_mode(inner_mode); | |
2027 | goto error; | |
2028 | } | |
2029 | ||
2030 | x->inner_mode = inner_mode; | |
2031 | } else { | |
2032 | struct xfrm_mode *inner_mode_iaf; | |
2033 | ||
2034 | inner_mode = xfrm_get_mode(x->props.mode, AF_INET); | |
2035 | if (inner_mode == NULL) | |
2036 | goto error; | |
2037 | ||
2038 | if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
2039 | xfrm_put_mode(inner_mode); | |
2040 | goto error; | |
2041 | } | |
2042 | ||
2043 | inner_mode_iaf = xfrm_get_mode(x->props.mode, AF_INET6); | |
2044 | if (inner_mode_iaf == NULL) | |
2045 | goto error; | |
2046 | ||
2047 | if (!(inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)) { | |
2048 | xfrm_put_mode(inner_mode_iaf); | |
2049 | goto error; | |
2050 | } | |
2051 | ||
2052 | if (x->props.family == AF_INET) { | |
2053 | x->inner_mode = inner_mode; | |
2054 | x->inner_mode_iaf = inner_mode_iaf; | |
2055 | } else { | |
2056 | x->inner_mode = inner_mode_iaf; | |
2057 | x->inner_mode_iaf = inner_mode; | |
2058 | } | |
2059 | } | |
13996378 | 2060 | |
d094cd83 | 2061 | x->type = xfrm_get_type(x->id.proto, family); |
72cb6962 HX |
2062 | if (x->type == NULL) |
2063 | goto error; | |
2064 | ||
2065 | err = x->type->init_state(x); | |
2066 | if (err) | |
2067 | goto error; | |
2068 | ||
13996378 HX |
2069 | x->outer_mode = xfrm_get_mode(x->props.mode, family); |
2070 | if (x->outer_mode == NULL) | |
b59f45d0 HX |
2071 | goto error; |
2072 | ||
72cb6962 HX |
2073 | x->km.state = XFRM_STATE_VALID; |
2074 | ||
2075 | error: | |
2076 | return err; | |
2077 | } | |
2078 | ||
2079 | EXPORT_SYMBOL(xfrm_init_state); | |
a716c119 | 2080 | |
d62ddc21 | 2081 | int __net_init xfrm_state_init(struct net *net) |
1da177e4 | 2082 | { |
f034b5d4 DM |
2083 | unsigned int sz; |
2084 | ||
9d4139c7 AD |
2085 | INIT_LIST_HEAD(&net->xfrm.state_all); |
2086 | ||
f034b5d4 DM |
2087 | sz = sizeof(struct hlist_head) * 8; |
2088 | ||
73d189dc AD |
2089 | net->xfrm.state_bydst = xfrm_hash_alloc(sz); |
2090 | if (!net->xfrm.state_bydst) | |
2091 | goto out_bydst; | |
d320bbb3 AD |
2092 | net->xfrm.state_bysrc = xfrm_hash_alloc(sz); |
2093 | if (!net->xfrm.state_bysrc) | |
2094 | goto out_bysrc; | |
b754a4fd AD |
2095 | net->xfrm.state_byspi = xfrm_hash_alloc(sz); |
2096 | if (!net->xfrm.state_byspi) | |
2097 | goto out_byspi; | |
529983ec | 2098 | net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); |
1da177e4 | 2099 | |
0bf7c5b0 | 2100 | net->xfrm.state_num = 0; |
63082733 | 2101 | INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); |
b8a0ae20 | 2102 | INIT_HLIST_HEAD(&net->xfrm.state_gc_list); |
c7837144 | 2103 | INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task); |
50a30657 | 2104 | init_waitqueue_head(&net->xfrm.km_waitq); |
d62ddc21 | 2105 | return 0; |
73d189dc | 2106 | |
b754a4fd AD |
2107 | out_byspi: |
2108 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
d320bbb3 AD |
2109 | out_bysrc: |
2110 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
73d189dc AD |
2111 | out_bydst: |
2112 | return -ENOMEM; | |
d62ddc21 AD |
2113 | } |
2114 | ||
2115 | void xfrm_state_fini(struct net *net) | |
2116 | { | |
7c2776ee | 2117 | struct xfrm_audit audit_info; |
73d189dc AD |
2118 | unsigned int sz; |
2119 | ||
7c2776ee AD |
2120 | flush_work(&net->xfrm.state_hash_work); |
2121 | audit_info.loginuid = -1; | |
2122 | audit_info.sessionid = -1; | |
2123 | audit_info.secid = 0; | |
2124 | xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info); | |
2125 | flush_work(&net->xfrm.state_gc_work); | |
2126 | ||
9d4139c7 | 2127 | WARN_ON(!list_empty(&net->xfrm.state_all)); |
73d189dc | 2128 | |
529983ec | 2129 | sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); |
b754a4fd AD |
2130 | WARN_ON(!hlist_empty(net->xfrm.state_byspi)); |
2131 | xfrm_hash_free(net->xfrm.state_byspi, sz); | |
d320bbb3 AD |
2132 | WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); |
2133 | xfrm_hash_free(net->xfrm.state_bysrc, sz); | |
73d189dc AD |
2134 | WARN_ON(!hlist_empty(net->xfrm.state_bydst)); |
2135 | xfrm_hash_free(net->xfrm.state_bydst, sz); | |
1da177e4 LT |
2136 | } |
2137 | ||
ab5f5e8b | 2138 | #ifdef CONFIG_AUDITSYSCALL |
cf35f43e IJ |
2139 | static void xfrm_audit_helper_sainfo(struct xfrm_state *x, |
2140 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2141 | { |
68277acc PM |
2142 | struct xfrm_sec_ctx *ctx = x->security; |
2143 | u32 spi = ntohl(x->id.spi); | |
2144 | ||
2145 | if (ctx) | |
ab5f5e8b | 2146 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
68277acc | 2147 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b JL |
2148 | |
2149 | switch(x->props.family) { | |
2150 | case AF_INET: | |
21454aaa HH |
2151 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2152 | &x->props.saddr.a4, &x->id.daddr.a4); | |
ab5f5e8b JL |
2153 | break; |
2154 | case AF_INET6: | |
5b095d98 | 2155 | audit_log_format(audit_buf, " src=%pI6 dst=%pI6", |
fdb46ee7 | 2156 | x->props.saddr.a6, x->id.daddr.a6); |
ab5f5e8b JL |
2157 | break; |
2158 | } | |
68277acc PM |
2159 | |
2160 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
ab5f5e8b JL |
2161 | } |
2162 | ||
cf35f43e IJ |
2163 | static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, |
2164 | struct audit_buffer *audit_buf) | |
afeb14b4 PM |
2165 | { |
2166 | struct iphdr *iph4; | |
2167 | struct ipv6hdr *iph6; | |
2168 | ||
2169 | switch (family) { | |
2170 | case AF_INET: | |
2171 | iph4 = ip_hdr(skb); | |
21454aaa HH |
2172 | audit_log_format(audit_buf, " src=%pI4 dst=%pI4", |
2173 | &iph4->saddr, &iph4->daddr); | |
afeb14b4 PM |
2174 | break; |
2175 | case AF_INET6: | |
2176 | iph6 = ipv6_hdr(skb); | |
2177 | audit_log_format(audit_buf, | |
5b095d98 | 2178 | " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", |
fdb46ee7 | 2179 | &iph6->saddr,&iph6->daddr, |
afeb14b4 PM |
2180 | iph6->flow_lbl[0] & 0x0f, |
2181 | iph6->flow_lbl[1], | |
2182 | iph6->flow_lbl[2]); | |
2183 | break; | |
2184 | } | |
2185 | } | |
2186 | ||
68277acc | 2187 | void xfrm_audit_state_add(struct xfrm_state *x, int result, |
2532386f | 2188 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2189 | { |
2190 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2191 | |
afeb14b4 | 2192 | audit_buf = xfrm_audit_start("SAD-add"); |
ab5f5e8b JL |
2193 | if (audit_buf == NULL) |
2194 | return; | |
2532386f | 2195 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2196 | xfrm_audit_helper_sainfo(x, audit_buf); |
2197 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2198 | audit_log_end(audit_buf); |
2199 | } | |
2200 | EXPORT_SYMBOL_GPL(xfrm_audit_state_add); | |
2201 | ||
68277acc | 2202 | void xfrm_audit_state_delete(struct xfrm_state *x, int result, |
2532386f | 2203 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2204 | { |
2205 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2206 | |
afeb14b4 | 2207 | audit_buf = xfrm_audit_start("SAD-delete"); |
ab5f5e8b JL |
2208 | if (audit_buf == NULL) |
2209 | return; | |
2532386f | 2210 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 PM |
2211 | xfrm_audit_helper_sainfo(x, audit_buf); |
2212 | audit_log_format(audit_buf, " res=%u", result); | |
ab5f5e8b JL |
2213 | audit_log_end(audit_buf); |
2214 | } | |
2215 | EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); | |
afeb14b4 PM |
2216 | |
2217 | void xfrm_audit_state_replay_overflow(struct xfrm_state *x, | |
2218 | struct sk_buff *skb) | |
2219 | { | |
2220 | struct audit_buffer *audit_buf; | |
2221 | u32 spi; | |
2222 | ||
2223 | audit_buf = xfrm_audit_start("SA-replay-overflow"); | |
2224 | if (audit_buf == NULL) | |
2225 | return; | |
2226 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2227 | /* don't record the sequence number because it's inherent in this kind | |
2228 | * of audit message */ | |
2229 | spi = ntohl(x->id.spi); | |
2230 | audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); | |
2231 | audit_log_end(audit_buf); | |
2232 | } | |
2233 | EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); | |
2234 | ||
2235 | static void xfrm_audit_state_replay(struct xfrm_state *x, | |
2236 | struct sk_buff *skb, __be32 net_seq) | |
2237 | { | |
2238 | struct audit_buffer *audit_buf; | |
2239 | u32 spi; | |
2240 | ||
2241 | audit_buf = xfrm_audit_start("SA-replayed-pkt"); | |
2242 | if (audit_buf == NULL) | |
2243 | return; | |
2244 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2245 | spi = ntohl(x->id.spi); | |
2246 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2247 | spi, spi, ntohl(net_seq)); | |
2248 | audit_log_end(audit_buf); | |
2249 | } | |
2250 | ||
2251 | void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) | |
2252 | { | |
2253 | struct audit_buffer *audit_buf; | |
2254 | ||
2255 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2256 | if (audit_buf == NULL) | |
2257 | return; | |
2258 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2259 | audit_log_end(audit_buf); | |
2260 | } | |
2261 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); | |
2262 | ||
2263 | void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, | |
2264 | __be32 net_spi, __be32 net_seq) | |
2265 | { | |
2266 | struct audit_buffer *audit_buf; | |
2267 | u32 spi; | |
2268 | ||
2269 | audit_buf = xfrm_audit_start("SA-notfound"); | |
2270 | if (audit_buf == NULL) | |
2271 | return; | |
2272 | xfrm_audit_helper_pktinfo(skb, family, audit_buf); | |
2273 | spi = ntohl(net_spi); | |
2274 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2275 | spi, spi, ntohl(net_seq)); | |
2276 | audit_log_end(audit_buf); | |
2277 | } | |
2278 | EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); | |
2279 | ||
2280 | void xfrm_audit_state_icvfail(struct xfrm_state *x, | |
2281 | struct sk_buff *skb, u8 proto) | |
2282 | { | |
2283 | struct audit_buffer *audit_buf; | |
2284 | __be32 net_spi; | |
2285 | __be32 net_seq; | |
2286 | ||
2287 | audit_buf = xfrm_audit_start("SA-icv-failure"); | |
2288 | if (audit_buf == NULL) | |
2289 | return; | |
2290 | xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); | |
2291 | if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { | |
2292 | u32 spi = ntohl(net_spi); | |
2293 | audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", | |
2294 | spi, spi, ntohl(net_seq)); | |
2295 | } | |
2296 | audit_log_end(audit_buf); | |
2297 | } | |
2298 | EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); | |
ab5f5e8b | 2299 | #endif /* CONFIG_AUDITSYSCALL */ |