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1da177e4 LT |
1 | #ifndef _NET_XFRM_H |
2 | #define _NET_XFRM_H | |
3 | ||
aabc9761 | 4 | #include <linux/compiler.h> |
1da177e4 LT |
5 | #include <linux/xfrm.h> |
6 | #include <linux/spinlock.h> | |
7 | #include <linux/list.h> | |
8 | #include <linux/skbuff.h> | |
14c85021 | 9 | #include <linux/socket.h> |
1da177e4 | 10 | #include <linux/pfkeyv2.h> |
5794708f | 11 | #include <linux/ipsec.h> |
1da177e4 | 12 | #include <linux/in6.h> |
4a3e2f71 | 13 | #include <linux/mutex.h> |
ab5f5e8b | 14 | #include <linux/audit.h> |
1da177e4 LT |
15 | |
16 | #include <net/sock.h> | |
17 | #include <net/dst.h> | |
436a0a40 | 18 | #include <net/ip.h> |
1da177e4 LT |
19 | #include <net/route.h> |
20 | #include <net/ipv6.h> | |
21 | #include <net/ip6_fib.h> | |
558f82ef MN |
22 | #ifdef CONFIG_XFRM_STATISTICS |
23 | #include <net/snmp.h> | |
24 | #endif | |
1da177e4 | 25 | |
d3d6dd3a MN |
26 | #define XFRM_PROTO_ESP 50 |
27 | #define XFRM_PROTO_AH 51 | |
28 | #define XFRM_PROTO_COMP 108 | |
29 | #define XFRM_PROTO_IPIP 4 | |
30 | #define XFRM_PROTO_IPV6 41 | |
31 | #define XFRM_PROTO_ROUTING IPPROTO_ROUTING | |
32 | #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS | |
33 | ||
1da177e4 | 34 | #define XFRM_ALIGN8(len) (((len) + 7) & ~7) |
b59f45d0 HX |
35 | #define MODULE_ALIAS_XFRM_MODE(family, encap) \ |
36 | MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) | |
d3d6dd3a MN |
37 | #define MODULE_ALIAS_XFRM_TYPE(family, proto) \ |
38 | MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) | |
1da177e4 | 39 | |
558f82ef MN |
40 | #ifdef CONFIG_XFRM_STATISTICS |
41 | DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics); | |
42 | #define XFRM_INC_STATS(field) SNMP_INC_STATS(xfrm_statistics, field) | |
43 | #define XFRM_INC_STATS_BH(field) SNMP_INC_STATS_BH(xfrm_statistics, field) | |
44 | #define XFRM_INC_STATS_USER(field) SNMP_INC_STATS_USER(xfrm_statistics, field) | |
45 | #else | |
46 | #define XFRM_INC_STATS(field) | |
47 | #define XFRM_INC_STATS_BH(field) | |
48 | #define XFRM_INC_STATS_USER(field) | |
49 | #endif | |
50 | ||
f8cd5488 JHS |
51 | extern struct sock *xfrm_nl; |
52 | extern u32 sysctl_xfrm_aevent_etime; | |
53 | extern u32 sysctl_xfrm_aevent_rseqth; | |
a37ae408 PE |
54 | extern int sysctl_xfrm_larval_drop; |
55 | extern u32 sysctl_xfrm_acq_expires; | |
f8cd5488 | 56 | |
4a3e2f71 | 57 | extern struct mutex xfrm_cfg_mutex; |
1da177e4 LT |
58 | |
59 | /* Organization of SPD aka "XFRM rules" | |
60 | ------------------------------------ | |
61 | ||
62 | Basic objects: | |
63 | - policy rule, struct xfrm_policy (=SPD entry) | |
64 | - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) | |
65 | - instance of a transformer, struct xfrm_state (=SA) | |
66 | - template to clone xfrm_state, struct xfrm_tmpl | |
67 | ||
68 | SPD is plain linear list of xfrm_policy rules, ordered by priority. | |
69 | (To be compatible with existing pfkeyv2 implementations, | |
70 | many rules with priority of 0x7fffffff are allowed to exist and | |
71 | such rules are ordered in an unpredictable way, thanks to bsd folks.) | |
72 | ||
73 | Lookup is plain linear search until the first match with selector. | |
74 | ||
75 | If "action" is "block", then we prohibit the flow, otherwise: | |
76 | if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, | |
77 | policy entry has list of up to XFRM_MAX_DEPTH transformations, | |
78 | described by templates xfrm_tmpl. Each template is resolved | |
79 | to a complete xfrm_state (see below) and we pack bundle of transformations | |
80 | to a dst_entry returned to requestor. | |
81 | ||
82 | dst -. xfrm .-> xfrm_state #1 | |
83 | |---. child .-> dst -. xfrm .-> xfrm_state #2 | |
84 | |---. child .-> dst -. xfrm .-> xfrm_state #3 | |
85 | |---. child .-> NULL | |
86 | ||
87 | Bundles are cached at xrfm_policy struct (field ->bundles). | |
88 | ||
89 | ||
90 | Resolution of xrfm_tmpl | |
91 | ----------------------- | |
92 | Template contains: | |
93 | 1. ->mode Mode: transport or tunnel | |
94 | 2. ->id.proto Protocol: AH/ESP/IPCOMP | |
95 | 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. | |
96 | Q: allow to resolve security gateway? | |
97 | 4. ->id.spi If not zero, static SPI. | |
98 | 5. ->saddr Local tunnel endpoint, ignored for transport mode. | |
99 | 6. ->algos List of allowed algos. Plain bitmask now. | |
100 | Q: ealgos, aalgos, calgos. What a mess... | |
101 | 7. ->share Sharing mode. | |
102 | Q: how to implement private sharing mode? To add struct sock* to | |
103 | flow id? | |
104 | ||
105 | Having this template we search through SAD searching for entries | |
106 | with appropriate mode/proto/algo, permitted by selector. | |
107 | If no appropriate entry found, it is requested from key manager. | |
108 | ||
109 | PROBLEMS: | |
110 | Q: How to find all the bundles referring to a physical path for | |
111 | PMTU discovery? Seems, dst should contain list of all parents... | |
112 | and enter to infinite locking hierarchy disaster. | |
113 | No! It is easier, we will not search for them, let them find us. | |
114 | We add genid to each dst plus pointer to genid of raw IP route, | |
115 | pmtu disc will update pmtu on raw IP route and increase its genid. | |
116 | dst_check() will see this for top level and trigger resyncing | |
117 | metrics. Plus, it will be made via sk->sk_dst_cache. Solved. | |
118 | */ | |
119 | ||
120 | /* Full description of state of transformer. */ | |
121 | struct xfrm_state | |
122 | { | |
123 | /* Note: bydst is re-used during gc */ | |
8f126e37 DM |
124 | struct hlist_node bydst; |
125 | struct hlist_node bysrc; | |
126 | struct hlist_node byspi; | |
1da177e4 LT |
127 | |
128 | atomic_t refcnt; | |
129 | spinlock_t lock; | |
130 | ||
131 | struct xfrm_id id; | |
132 | struct xfrm_selector sel; | |
133 | ||
9d4a706d DM |
134 | u32 genid; |
135 | ||
1da177e4 LT |
136 | /* Key manger bits */ |
137 | struct { | |
138 | u8 state; | |
139 | u8 dying; | |
140 | u32 seq; | |
141 | } km; | |
142 | ||
143 | /* Parameters of this state. */ | |
144 | struct { | |
145 | u32 reqid; | |
146 | u8 mode; | |
147 | u8 replay_window; | |
148 | u8 aalgo, ealgo, calgo; | |
149 | u8 flags; | |
150 | u16 family; | |
151 | xfrm_address_t saddr; | |
152 | int header_len; | |
153 | int trailer_len; | |
154 | } props; | |
155 | ||
156 | struct xfrm_lifetime_cfg lft; | |
157 | ||
158 | /* Data for transformer */ | |
159 | struct xfrm_algo *aalg; | |
160 | struct xfrm_algo *ealg; | |
161 | struct xfrm_algo *calg; | |
1a6509d9 | 162 | struct xfrm_algo_aead *aead; |
1da177e4 LT |
163 | |
164 | /* Data for encapsulator */ | |
165 | struct xfrm_encap_tmpl *encap; | |
166 | ||
060f02a3 NT |
167 | /* Data for care-of address */ |
168 | xfrm_address_t *coaddr; | |
169 | ||
1da177e4 LT |
170 | /* IPComp needs an IPIP tunnel for handling uncompressed packets */ |
171 | struct xfrm_state *tunnel; | |
172 | ||
173 | /* If a tunnel, number of users + 1 */ | |
174 | atomic_t tunnel_users; | |
175 | ||
176 | /* State for replay detection */ | |
177 | struct xfrm_replay_state replay; | |
178 | ||
f8cd5488 JHS |
179 | /* Replay detection state at the time we sent the last notification */ |
180 | struct xfrm_replay_state preplay; | |
181 | ||
2717096a JHS |
182 | /* internal flag that only holds state for delayed aevent at the |
183 | * moment | |
184 | */ | |
185 | u32 xflags; | |
186 | ||
f8cd5488 JHS |
187 | /* Replay detection notification settings */ |
188 | u32 replay_maxage; | |
189 | u32 replay_maxdiff; | |
190 | ||
191 | /* Replay detection notification timer */ | |
192 | struct timer_list rtimer; | |
193 | ||
1da177e4 LT |
194 | /* Statistics */ |
195 | struct xfrm_stats stats; | |
196 | ||
197 | struct xfrm_lifetime_cur curlft; | |
198 | struct timer_list timer; | |
199 | ||
9afaca05 | 200 | /* Last used time */ |
d26f3984 | 201 | unsigned long lastused; |
9afaca05 | 202 | |
1da177e4 LT |
203 | /* Reference to data common to all the instances of this |
204 | * transformer. */ | |
533cb5b0 | 205 | const struct xfrm_type *type; |
13996378 HX |
206 | struct xfrm_mode *inner_mode; |
207 | struct xfrm_mode *outer_mode; | |
1da177e4 | 208 | |
df71837d TJ |
209 | /* Security context */ |
210 | struct xfrm_sec_ctx *security; | |
211 | ||
1da177e4 LT |
212 | /* Private data of this transformer, format is opaque, |
213 | * interpreted by xfrm_type methods. */ | |
214 | void *data; | |
215 | }; | |
216 | ||
2717096a JHS |
217 | /* xflags - make enum if more show up */ |
218 | #define XFRM_TIME_DEFER 1 | |
219 | ||
1da177e4 LT |
220 | enum { |
221 | XFRM_STATE_VOID, | |
222 | XFRM_STATE_ACQ, | |
223 | XFRM_STATE_VALID, | |
224 | XFRM_STATE_ERROR, | |
225 | XFRM_STATE_EXPIRED, | |
226 | XFRM_STATE_DEAD | |
227 | }; | |
228 | ||
26b15dad JHS |
229 | /* callback structure passed from either netlink or pfkey */ |
230 | struct km_event | |
231 | { | |
bf08867f HX |
232 | union { |
233 | u32 hard; | |
234 | u32 proto; | |
235 | u32 byid; | |
f8cd5488 | 236 | u32 aevent; |
f7b6983f | 237 | u32 type; |
bf08867f HX |
238 | } data; |
239 | ||
26b15dad JHS |
240 | u32 seq; |
241 | u32 pid; | |
242 | u32 event; | |
243 | }; | |
244 | ||
25ee3286 | 245 | struct net_device; |
1da177e4 LT |
246 | struct xfrm_type; |
247 | struct xfrm_dst; | |
248 | struct xfrm_policy_afinfo { | |
249 | unsigned short family; | |
1da177e4 LT |
250 | struct dst_ops *dst_ops; |
251 | void (*garbage_collect)(void); | |
66cdb3ca HX |
252 | struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr, |
253 | xfrm_address_t *daddr); | |
a1e59abf | 254 | int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr); |
1da177e4 | 255 | struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); |
1da177e4 | 256 | void (*decode_session)(struct sk_buff *skb, |
d5422efe HX |
257 | struct flowi *fl, |
258 | int reverse); | |
25ee3286 | 259 | int (*get_tos)(struct flowi *fl); |
a1b05140 MN |
260 | int (*init_path)(struct xfrm_dst *path, |
261 | struct dst_entry *dst, | |
262 | int nfheader_len); | |
25ee3286 HX |
263 | int (*fill_dst)(struct xfrm_dst *xdst, |
264 | struct net_device *dev); | |
1da177e4 LT |
265 | }; |
266 | ||
267 | extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); | |
268 | extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); | |
26b15dad JHS |
269 | extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); |
270 | extern void km_state_notify(struct xfrm_state *x, struct km_event *c); | |
1da177e4 LT |
271 | |
272 | struct xfrm_tmpl; | |
980ebd25 | 273 | extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d JHS |
274 | extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
275 | extern int __xfrm_state_delete(struct xfrm_state *x); | |
276 | ||
1da177e4 | 277 | struct xfrm_state_afinfo { |
17c2a42a | 278 | unsigned int family; |
36cf9acf | 279 | unsigned int proto; |
227620e2 | 280 | unsigned int eth_proto; |
17c2a42a | 281 | struct module *owner; |
533cb5b0 | 282 | const struct xfrm_type *type_map[IPPROTO_MAX]; |
aa5d62cc | 283 | struct xfrm_mode *mode_map[XFRM_MODE_MAX]; |
d094cd83 | 284 | int (*init_flags)(struct xfrm_state *x); |
1da177e4 LT |
285 | void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, |
286 | struct xfrm_tmpl *tmpl, | |
287 | xfrm_address_t *daddr, xfrm_address_t *saddr); | |
41a49cc3 MN |
288 | int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); |
289 | int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); | |
cdca7265 | 290 | int (*output)(struct sk_buff *skb); |
227620e2 HX |
291 | int (*extract_input)(struct xfrm_state *x, |
292 | struct sk_buff *skb); | |
36cf9acf HX |
293 | int (*extract_output)(struct xfrm_state *x, |
294 | struct sk_buff *skb); | |
716062fd HX |
295 | int (*transport_finish)(struct sk_buff *skb, |
296 | int async); | |
1da177e4 LT |
297 | }; |
298 | ||
299 | extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); | |
300 | extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); | |
301 | ||
302 | extern void xfrm_state_delete_tunnel(struct xfrm_state *x); | |
303 | ||
1da177e4 LT |
304 | struct xfrm_type |
305 | { | |
306 | char *description; | |
307 | struct module *owner; | |
308 | __u8 proto; | |
1b5c2299 MN |
309 | __u8 flags; |
310 | #define XFRM_TYPE_NON_FRAGMENT 1 | |
436a0a40 | 311 | #define XFRM_TYPE_REPLAY_PROT 2 |
f04e7e8d HX |
312 | #define XFRM_TYPE_LOCAL_COADDR 4 |
313 | #define XFRM_TYPE_REMOTE_COADDR 8 | |
1da177e4 | 314 | |
72cb6962 | 315 | int (*init_state)(struct xfrm_state *x); |
1da177e4 | 316 | void (*destructor)(struct xfrm_state *); |
e695633e | 317 | int (*input)(struct xfrm_state *, struct sk_buff *skb); |
1da177e4 | 318 | int (*output)(struct xfrm_state *, struct sk_buff *pskb); |
df0ba92a | 319 | int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *); |
aee5adb4 | 320 | int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); |
1da177e4 | 321 | /* Estimate maximal size of result of transformation of a dgram */ |
c5c25238 | 322 | u32 (*get_mtu)(struct xfrm_state *, int size); |
1da177e4 LT |
323 | }; |
324 | ||
533cb5b0 ED |
325 | extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family); |
326 | extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); | |
1da177e4 | 327 | |
b59f45d0 | 328 | struct xfrm_mode { |
227620e2 HX |
329 | /* |
330 | * Remove encapsulation header. | |
331 | * | |
332 | * The IP header will be moved over the top of the encapsulation | |
333 | * header. | |
334 | * | |
335 | * On entry, the transport header shall point to where the IP header | |
336 | * should be and the network header shall be set to where the IP | |
337 | * header currently is. skb->data shall point to the start of the | |
338 | * payload. | |
339 | */ | |
340 | int (*input2)(struct xfrm_state *x, struct sk_buff *skb); | |
341 | ||
342 | /* | |
343 | * This is the actual input entry point. | |
344 | * | |
345 | * For transport mode and equivalent this would be identical to | |
346 | * input2 (which does not need to be set). While tunnel mode | |
347 | * and equivalent would set this to the tunnel encapsulation function | |
348 | * xfrm4_prepare_input that would in turn call input2. | |
349 | */ | |
b59f45d0 | 350 | int (*input)(struct xfrm_state *x, struct sk_buff *skb); |
37fedd3a HX |
351 | |
352 | /* | |
353 | * Add encapsulation header. | |
354 | * | |
355 | * On exit, the transport header will be set to the start of the | |
356 | * encapsulation header to be filled in by x->type->output and | |
357 | * the mac header will be set to the nextheader (protocol for | |
358 | * IPv4) field of the extension header directly preceding the | |
359 | * encapsulation header, or in its absence, that of the top IP | |
360 | * header. The value of the network header will always point | |
361 | * to the top IP header while skb->data will point to the payload. | |
362 | */ | |
36cf9acf HX |
363 | int (*output2)(struct xfrm_state *x,struct sk_buff *skb); |
364 | ||
365 | /* | |
366 | * This is the actual output entry point. | |
367 | * | |
368 | * For transport mode and equivalent this would be identical to | |
369 | * output2 (which does not need to be set). While tunnel mode | |
370 | * and equivalent would set this to a tunnel encapsulation function | |
371 | * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn | |
372 | * call output2. | |
373 | */ | |
374 | int (*output)(struct xfrm_state *x, struct sk_buff *skb); | |
b59f45d0 | 375 | |
17c2a42a | 376 | struct xfrm_state_afinfo *afinfo; |
b59f45d0 HX |
377 | struct module *owner; |
378 | unsigned int encap; | |
1bfcb10f HX |
379 | int flags; |
380 | }; | |
381 | ||
382 | /* Flags for xfrm_mode. */ | |
383 | enum { | |
384 | XFRM_MODE_FLAG_TUNNEL = 1, | |
b59f45d0 HX |
385 | }; |
386 | ||
387 | extern int xfrm_register_mode(struct xfrm_mode *mode, int family); | |
388 | extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); | |
b59f45d0 | 389 | |
1da177e4 LT |
390 | struct xfrm_tmpl |
391 | { | |
392 | /* id in template is interpreted as: | |
393 | * daddr - destination of tunnel, may be zero for transport mode. | |
394 | * spi - zero to acquire spi. Not zero if spi is static, then | |
395 | * daddr must be fixed too. | |
396 | * proto - AH/ESP/IPCOMP | |
397 | */ | |
398 | struct xfrm_id id; | |
399 | ||
400 | /* Source address of tunnel. Ignored, if it is not a tunnel. */ | |
401 | xfrm_address_t saddr; | |
402 | ||
76b3f055 MK |
403 | unsigned short encap_family; |
404 | ||
1da177e4 LT |
405 | __u32 reqid; |
406 | ||
7e49e6de | 407 | /* Mode: transport, tunnel etc. */ |
1da177e4 LT |
408 | __u8 mode; |
409 | ||
410 | /* Sharing mode: unique, this session only, this user only etc. */ | |
411 | __u8 share; | |
412 | ||
413 | /* May skip this transfomration if no SA is found */ | |
414 | __u8 optional; | |
415 | ||
416 | /* Bit mask of algos allowed for acquisition */ | |
417 | __u32 aalgos; | |
418 | __u32 ealgos; | |
419 | __u32 calgos; | |
420 | }; | |
421 | ||
622dc828 | 422 | #define XFRM_MAX_DEPTH 6 |
1da177e4 LT |
423 | |
424 | struct xfrm_policy | |
425 | { | |
426 | struct xfrm_policy *next; | |
2518c7c2 DM |
427 | struct hlist_node bydst; |
428 | struct hlist_node byidx; | |
1da177e4 LT |
429 | |
430 | /* This lock only affects elements except for entry. */ | |
431 | rwlock_t lock; | |
432 | atomic_t refcnt; | |
433 | struct timer_list timer; | |
434 | ||
435 | u32 priority; | |
436 | u32 index; | |
437 | struct xfrm_selector selector; | |
438 | struct xfrm_lifetime_cfg lft; | |
439 | struct xfrm_lifetime_cur curlft; | |
440 | struct dst_entry *bundles; | |
46ca5f5d ACM |
441 | u16 family; |
442 | u8 type; | |
443 | u8 action; | |
444 | u8 flags; | |
445 | u8 dead; | |
446 | u8 xfrm_nr; | |
447 | /* XXX 1 byte hole, try to pack */ | |
df71837d | 448 | struct xfrm_sec_ctx *security; |
1da177e4 LT |
449 | struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; |
450 | }; | |
451 | ||
80c9abaa SS |
452 | struct xfrm_migrate { |
453 | xfrm_address_t old_daddr; | |
454 | xfrm_address_t old_saddr; | |
455 | xfrm_address_t new_daddr; | |
456 | xfrm_address_t new_saddr; | |
457 | u8 proto; | |
458 | u8 mode; | |
459 | u16 reserved; | |
460 | u32 reqid; | |
461 | u16 old_family; | |
462 | u16 new_family; | |
463 | }; | |
464 | ||
f8cd5488 JHS |
465 | #define XFRM_KM_TIMEOUT 30 |
466 | /* which seqno */ | |
467 | #define XFRM_REPLAY_SEQ 1 | |
468 | #define XFRM_REPLAY_OSEQ 2 | |
469 | #define XFRM_REPLAY_SEQ_MASK 3 | |
470 | /* what happened */ | |
471 | #define XFRM_REPLAY_UPDATE XFRM_AE_CR | |
472 | #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE | |
473 | ||
474 | /* default aevent timeout in units of 100ms */ | |
475 | #define XFRM_AE_ETIME 10 | |
476 | /* Async Event timer multiplier */ | |
477 | #define XFRM_AE_ETH_M 10 | |
478 | /* default seq threshold size */ | |
479 | #define XFRM_AE_SEQT_SIZE 2 | |
1da177e4 LT |
480 | |
481 | struct xfrm_mgr | |
482 | { | |
483 | struct list_head list; | |
484 | char *id; | |
26b15dad | 485 | int (*notify)(struct xfrm_state *x, struct km_event *c); |
1da177e4 | 486 | int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); |
cb969f07 | 487 | struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); |
5d36b180 | 488 | int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); |
26b15dad | 489 | int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); |
97a64b45 | 490 | int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); |
80c9abaa | 491 | int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles); |
1da177e4 LT |
492 | }; |
493 | ||
494 | extern int xfrm_register_km(struct xfrm_mgr *km); | |
495 | extern int xfrm_unregister_km(struct xfrm_mgr *km); | |
496 | ||
2518c7c2 | 497 | extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
1da177e4 | 498 | |
436a0a40 HX |
499 | /* |
500 | * This structure is used for the duration where packets are being | |
501 | * transformed by IPsec. As soon as the packet leaves IPsec the | |
502 | * area beyond the generic IP part may be overwritten. | |
503 | */ | |
504 | struct xfrm_skb_cb { | |
505 | union { | |
506 | struct inet_skb_parm h4; | |
507 | struct inet6_skb_parm h6; | |
508 | } header; | |
509 | ||
510 | /* Sequence number for replay protection. */ | |
b318e0e4 HX |
511 | union { |
512 | u64 output; | |
513 | __be32 input; | |
514 | } seq; | |
436a0a40 HX |
515 | }; |
516 | ||
517 | #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) | |
518 | ||
36cf9acf HX |
519 | /* |
520 | * This structure is used by the afinfo prepare_input/prepare_output functions | |
521 | * to transmit header information to the mode input/output functions. | |
522 | */ | |
523 | struct xfrm_mode_skb_cb { | |
524 | union { | |
525 | struct inet_skb_parm h4; | |
526 | struct inet6_skb_parm h6; | |
527 | } header; | |
528 | ||
529 | /* Copied from header for IPv4, always set to zero and DF for IPv6. */ | |
530 | __be16 id; | |
531 | __be16 frag_off; | |
532 | ||
533 | /* TOS for IPv4, class for IPv6. */ | |
534 | u8 tos; | |
535 | ||
536 | /* TTL for IPv4, hop limitfor IPv6. */ | |
537 | u8 ttl; | |
538 | ||
539 | /* Protocol for IPv4, NH for IPv6. */ | |
540 | u8 protocol; | |
541 | ||
542 | /* Used by IPv6 only, zero for IPv4. */ | |
543 | u8 flow_lbl[3]; | |
544 | }; | |
545 | ||
546 | #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) | |
547 | ||
716062fd HX |
548 | /* |
549 | * This structure is used by the input processing to locate the SPI and | |
550 | * related information. | |
551 | */ | |
552 | struct xfrm_spi_skb_cb { | |
553 | union { | |
554 | struct inet_skb_parm h4; | |
555 | struct inet6_skb_parm h6; | |
556 | } header; | |
557 | ||
716062fd | 558 | unsigned int daddroff; |
2fcb45b6 | 559 | unsigned int family; |
716062fd HX |
560 | }; |
561 | ||
562 | #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) | |
563 | ||
161a09e7 JL |
564 | /* Audit Information */ |
565 | struct xfrm_audit | |
566 | { | |
ab5f5e8b | 567 | u32 loginuid; |
161a09e7 JL |
568 | u32 secid; |
569 | }; | |
c9204d9c JL |
570 | |
571 | #ifdef CONFIG_AUDITSYSCALL | |
afeb14b4 | 572 | static inline struct audit_buffer *xfrm_audit_start(const char *op) |
ab5f5e8b JL |
573 | { |
574 | struct audit_buffer *audit_buf = NULL; | |
ab5f5e8b | 575 | |
afeb14b4 PM |
576 | if (audit_enabled == 0) |
577 | return NULL; | |
ab5f5e8b | 578 | audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, |
afeb14b4 | 579 | AUDIT_MAC_IPSEC_EVENT); |
ab5f5e8b JL |
580 | if (audit_buf == NULL) |
581 | return NULL; | |
afeb14b4 PM |
582 | audit_log_format(audit_buf, "op=%s", op); |
583 | return audit_buf; | |
584 | } | |
ab5f5e8b | 585 | |
afeb14b4 PM |
586 | static inline void xfrm_audit_helper_usrinfo(u32 auid, u32 secid, |
587 | struct audit_buffer *audit_buf) | |
588 | { | |
589 | char *secctx; | |
590 | u32 secctx_len; | |
ab5f5e8b | 591 | |
afeb14b4 | 592 | audit_log_format(audit_buf, " auid=%u", auid); |
68277acc PM |
593 | if (secid != 0 && |
594 | security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) { | |
ab5f5e8b JL |
595 | audit_log_format(audit_buf, " subj=%s", secctx); |
596 | security_release_secctx(secctx, secctx_len); | |
597 | } else | |
598 | audit_log_task_context(audit_buf); | |
ab5f5e8b JL |
599 | } |
600 | ||
601 | extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, | |
68277acc | 602 | u32 auid, u32 secid); |
ab5f5e8b | 603 | extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
68277acc | 604 | u32 auid, u32 secid); |
ab5f5e8b | 605 | extern void xfrm_audit_state_add(struct xfrm_state *x, int result, |
68277acc | 606 | u32 auid, u32 secid); |
ab5f5e8b | 607 | extern void xfrm_audit_state_delete(struct xfrm_state *x, int result, |
68277acc | 608 | u32 auid, u32 secid); |
afeb14b4 PM |
609 | extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x, |
610 | struct sk_buff *skb); | |
611 | extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); | |
612 | extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, | |
613 | __be32 net_spi, __be32 net_seq); | |
614 | extern void xfrm_audit_state_icvfail(struct xfrm_state *x, | |
615 | struct sk_buff *skb, u8 proto); | |
c9204d9c | 616 | #else |
ab5f5e8b JL |
617 | #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0) |
618 | #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0) | |
619 | #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0) | |
620 | #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0) | |
afeb14b4 PM |
621 | #define xfrm_audit_state_replay_overflow(x, s) do { ; } while (0) |
622 | #define xfrm_audit_state_notfound_simple(s, f) do { ; } while (0) | |
623 | #define xfrm_audit_state_notfound(s, f, sp, sq) do { ; } while (0) | |
624 | #define xfrm_audit_state_icvfail(x, s, p) do { ; } while (0) | |
c9204d9c | 625 | #endif /* CONFIG_AUDITSYSCALL */ |
161a09e7 | 626 | |
1da177e4 LT |
627 | static inline void xfrm_pol_hold(struct xfrm_policy *policy) |
628 | { | |
629 | if (likely(policy != NULL)) | |
630 | atomic_inc(&policy->refcnt); | |
631 | } | |
632 | ||
64c31b3f | 633 | extern void xfrm_policy_destroy(struct xfrm_policy *policy); |
1da177e4 LT |
634 | |
635 | static inline void xfrm_pol_put(struct xfrm_policy *policy) | |
636 | { | |
637 | if (atomic_dec_and_test(&policy->refcnt)) | |
64c31b3f | 638 | xfrm_policy_destroy(policy); |
1da177e4 LT |
639 | } |
640 | ||
4e81bb83 MN |
641 | #ifdef CONFIG_XFRM_SUB_POLICY |
642 | static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) | |
643 | { | |
644 | int i; | |
645 | for (i = npols - 1; i >= 0; --i) | |
646 | xfrm_pol_put(pols[i]); | |
647 | } | |
648 | #else | |
649 | static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) | |
650 | { | |
651 | xfrm_pol_put(pols[0]); | |
652 | } | |
653 | #endif | |
654 | ||
1da177e4 LT |
655 | extern void __xfrm_state_destroy(struct xfrm_state *); |
656 | ||
21380b81 HX |
657 | static inline void __xfrm_state_put(struct xfrm_state *x) |
658 | { | |
659 | atomic_dec(&x->refcnt); | |
660 | } | |
661 | ||
1da177e4 LT |
662 | static inline void xfrm_state_put(struct xfrm_state *x) |
663 | { | |
664 | if (atomic_dec_and_test(&x->refcnt)) | |
665 | __xfrm_state_destroy(x); | |
666 | } | |
667 | ||
668 | static inline void xfrm_state_hold(struct xfrm_state *x) | |
669 | { | |
670 | atomic_inc(&x->refcnt); | |
671 | } | |
672 | ||
673 | static __inline__ int addr_match(void *token1, void *token2, int prefixlen) | |
674 | { | |
5f19343f AV |
675 | __be32 *a1 = token1; |
676 | __be32 *a2 = token2; | |
1da177e4 LT |
677 | int pdw; |
678 | int pbi; | |
679 | ||
680 | pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ | |
681 | pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ | |
682 | ||
683 | if (pdw) | |
684 | if (memcmp(a1, a2, pdw << 2)) | |
685 | return 0; | |
686 | ||
687 | if (pbi) { | |
5f19343f | 688 | __be32 mask; |
1da177e4 LT |
689 | |
690 | mask = htonl((0xffffffff) << (32 - pbi)); | |
691 | ||
692 | if ((a1[pdw] ^ a2[pdw]) & mask) | |
693 | return 0; | |
694 | } | |
695 | ||
696 | return 1; | |
697 | } | |
698 | ||
699 | static __inline__ | |
f9d07e41 | 700 | __be16 xfrm_flowi_sport(struct flowi *fl) |
1da177e4 | 701 | { |
f9d07e41 | 702 | __be16 port; |
1da177e4 LT |
703 | switch(fl->proto) { |
704 | case IPPROTO_TCP: | |
705 | case IPPROTO_UDP: | |
ba4e58ec | 706 | case IPPROTO_UDPLITE: |
1da177e4 LT |
707 | case IPPROTO_SCTP: |
708 | port = fl->fl_ip_sport; | |
709 | break; | |
710 | case IPPROTO_ICMP: | |
711 | case IPPROTO_ICMPV6: | |
712 | port = htons(fl->fl_icmp_type); | |
713 | break; | |
2ce4272a MN |
714 | case IPPROTO_MH: |
715 | port = htons(fl->fl_mh_type); | |
716 | break; | |
1da177e4 LT |
717 | default: |
718 | port = 0; /*XXX*/ | |
719 | } | |
720 | return port; | |
721 | } | |
722 | ||
723 | static __inline__ | |
f9d07e41 | 724 | __be16 xfrm_flowi_dport(struct flowi *fl) |
1da177e4 | 725 | { |
f9d07e41 | 726 | __be16 port; |
1da177e4 LT |
727 | switch(fl->proto) { |
728 | case IPPROTO_TCP: | |
729 | case IPPROTO_UDP: | |
ba4e58ec | 730 | case IPPROTO_UDPLITE: |
1da177e4 LT |
731 | case IPPROTO_SCTP: |
732 | port = fl->fl_ip_dport; | |
733 | break; | |
734 | case IPPROTO_ICMP: | |
735 | case IPPROTO_ICMPV6: | |
736 | port = htons(fl->fl_icmp_code); | |
737 | break; | |
738 | default: | |
739 | port = 0; /*XXX*/ | |
740 | } | |
741 | return port; | |
742 | } | |
743 | ||
77681021 AM |
744 | extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, |
745 | unsigned short family); | |
1da177e4 | 746 | |
df71837d TJ |
747 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
748 | /* If neither has a context --> match | |
749 | * Otherwise, both must have a context and the sids, doi, alg must match | |
750 | */ | |
751 | static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) | |
752 | { | |
753 | return ((!s1 && !s2) || | |
754 | (s1 && s2 && | |
755 | (s1->ctx_sid == s2->ctx_sid) && | |
756 | (s1->ctx_doi == s2->ctx_doi) && | |
757 | (s1->ctx_alg == s2->ctx_alg))); | |
758 | } | |
759 | #else | |
760 | static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) | |
761 | { | |
762 | return 1; | |
763 | } | |
764 | #endif | |
765 | ||
1da177e4 LT |
766 | /* A struct encoding bundle of transformations to apply to some set of flow. |
767 | * | |
768 | * dst->child points to the next element of bundle. | |
769 | * dst->xfrm points to an instanse of transformer. | |
770 | * | |
771 | * Due to unfortunate limitations of current routing cache, which we | |
772 | * have no time to fix, it mirrors struct rtable and bound to the same | |
773 | * routing key, including saddr,daddr. However, we can have many of | |
774 | * bundles differing by session id. All the bundles grow from a parent | |
775 | * policy rule. | |
776 | */ | |
777 | struct xfrm_dst | |
778 | { | |
779 | union { | |
1da177e4 LT |
780 | struct dst_entry dst; |
781 | struct rtable rt; | |
782 | struct rt6_info rt6; | |
783 | } u; | |
784 | struct dst_entry *route; | |
157bfc25 MN |
785 | #ifdef CONFIG_XFRM_SUB_POLICY |
786 | struct flowi *origin; | |
787 | struct xfrm_selector *partner; | |
788 | #endif | |
9d4a706d | 789 | u32 genid; |
1da177e4 LT |
790 | u32 route_mtu_cached; |
791 | u32 child_mtu_cached; | |
92d63dec HY |
792 | u32 route_cookie; |
793 | u32 path_cookie; | |
1da177e4 LT |
794 | }; |
795 | ||
aabc9761 HX |
796 | static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) |
797 | { | |
798 | dst_release(xdst->route); | |
799 | if (likely(xdst->u.dst.xfrm)) | |
800 | xfrm_state_put(xdst->u.dst.xfrm); | |
157bfc25 MN |
801 | #ifdef CONFIG_XFRM_SUB_POLICY |
802 | kfree(xdst->origin); | |
803 | xdst->origin = NULL; | |
804 | kfree(xdst->partner); | |
805 | xdst->partner = NULL; | |
806 | #endif | |
aabc9761 HX |
807 | } |
808 | ||
809 | extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); | |
810 | ||
1da177e4 LT |
811 | struct sec_path |
812 | { | |
813 | atomic_t refcnt; | |
814 | int len; | |
dbe5b4aa | 815 | struct xfrm_state *xvec[XFRM_MAX_DEPTH]; |
1da177e4 LT |
816 | }; |
817 | ||
818 | static inline struct sec_path * | |
819 | secpath_get(struct sec_path *sp) | |
820 | { | |
821 | if (sp) | |
822 | atomic_inc(&sp->refcnt); | |
823 | return sp; | |
824 | } | |
825 | ||
826 | extern void __secpath_destroy(struct sec_path *sp); | |
827 | ||
828 | static inline void | |
829 | secpath_put(struct sec_path *sp) | |
830 | { | |
831 | if (sp && atomic_dec_and_test(&sp->refcnt)) | |
832 | __secpath_destroy(sp); | |
833 | } | |
834 | ||
835 | extern struct sec_path *secpath_dup(struct sec_path *src); | |
836 | ||
837 | static inline void | |
838 | secpath_reset(struct sk_buff *skb) | |
839 | { | |
840 | #ifdef CONFIG_XFRM | |
841 | secpath_put(skb->sp); | |
842 | skb->sp = NULL; | |
843 | #endif | |
844 | } | |
845 | ||
a1e59abf PM |
846 | static inline int |
847 | xfrm_addr_any(xfrm_address_t *addr, unsigned short family) | |
848 | { | |
849 | switch (family) { | |
850 | case AF_INET: | |
851 | return addr->a4 == 0; | |
852 | case AF_INET6: | |
853 | return ipv6_addr_any((struct in6_addr *)&addr->a6); | |
854 | } | |
855 | return 0; | |
856 | } | |
857 | ||
1da177e4 LT |
858 | static inline int |
859 | __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) | |
860 | { | |
861 | return (tmpl->saddr.a4 && | |
862 | tmpl->saddr.a4 != x->props.saddr.a4); | |
863 | } | |
864 | ||
865 | static inline int | |
866 | __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) | |
867 | { | |
868 | return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && | |
869 | ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); | |
870 | } | |
871 | ||
872 | static inline int | |
873 | xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) | |
874 | { | |
875 | switch (family) { | |
876 | case AF_INET: | |
877 | return __xfrm4_state_addr_cmp(tmpl, x); | |
878 | case AF_INET6: | |
879 | return __xfrm6_state_addr_cmp(tmpl, x); | |
880 | } | |
881 | return !0; | |
882 | } | |
883 | ||
884 | #ifdef CONFIG_XFRM | |
1da177e4 LT |
885 | extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); |
886 | ||
d5422efe HX |
887 | static inline int __xfrm_policy_check2(struct sock *sk, int dir, |
888 | struct sk_buff *skb, | |
889 | unsigned int family, int reverse) | |
1da177e4 | 890 | { |
d5422efe HX |
891 | int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); |
892 | ||
1da177e4 | 893 | if (sk && sk->sk_policy[XFRM_POLICY_IN]) |
d5422efe | 894 | return __xfrm_policy_check(sk, ndir, skb, family); |
4e81bb83 | 895 | |
2518c7c2 | 896 | return (!xfrm_policy_count[dir] && !skb->sp) || |
1da177e4 | 897 | (skb->dst->flags & DST_NOPOLICY) || |
d5422efe HX |
898 | __xfrm_policy_check(sk, ndir, skb, family); |
899 | } | |
900 | ||
901 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) | |
902 | { | |
903 | return __xfrm_policy_check2(sk, dir, skb, family, 0); | |
1da177e4 LT |
904 | } |
905 | ||
906 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
907 | { | |
908 | return xfrm_policy_check(sk, dir, skb, AF_INET); | |
909 | } | |
910 | ||
911 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
912 | { | |
913 | return xfrm_policy_check(sk, dir, skb, AF_INET6); | |
914 | } | |
915 | ||
d5422efe HX |
916 | static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, |
917 | struct sk_buff *skb) | |
918 | { | |
919 | return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); | |
920 | } | |
921 | ||
922 | static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, | |
923 | struct sk_buff *skb) | |
924 | { | |
925 | return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); | |
926 | } | |
927 | ||
928 | extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, | |
929 | unsigned int family, int reverse); | |
930 | ||
931 | static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, | |
932 | unsigned int family) | |
933 | { | |
934 | return __xfrm_decode_session(skb, fl, family, 0); | |
935 | } | |
936 | ||
937 | static inline int xfrm_decode_session_reverse(struct sk_buff *skb, | |
938 | struct flowi *fl, | |
939 | unsigned int family) | |
940 | { | |
941 | return __xfrm_decode_session(skb, fl, family, 1); | |
942 | } | |
943 | ||
1da177e4 LT |
944 | extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); |
945 | ||
946 | static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
947 | { | |
2518c7c2 | 948 | return !xfrm_policy_count[XFRM_POLICY_OUT] || |
1da177e4 LT |
949 | (skb->dst->flags & DST_NOXFRM) || |
950 | __xfrm_route_forward(skb, family); | |
951 | } | |
952 | ||
953 | static inline int xfrm4_route_forward(struct sk_buff *skb) | |
954 | { | |
955 | return xfrm_route_forward(skb, AF_INET); | |
956 | } | |
957 | ||
958 | static inline int xfrm6_route_forward(struct sk_buff *skb) | |
959 | { | |
960 | return xfrm_route_forward(skb, AF_INET6); | |
961 | } | |
962 | ||
963 | extern int __xfrm_sk_clone_policy(struct sock *sk); | |
964 | ||
965 | static inline int xfrm_sk_clone_policy(struct sock *sk) | |
966 | { | |
967 | if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) | |
968 | return __xfrm_sk_clone_policy(sk); | |
969 | return 0; | |
970 | } | |
971 | ||
4666faab | 972 | extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); |
1da177e4 LT |
973 | |
974 | static inline void xfrm_sk_free_policy(struct sock *sk) | |
975 | { | |
976 | if (unlikely(sk->sk_policy[0] != NULL)) { | |
977 | xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); | |
978 | sk->sk_policy[0] = NULL; | |
979 | } | |
980 | if (unlikely(sk->sk_policy[1] != NULL)) { | |
981 | xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); | |
982 | sk->sk_policy[1] = NULL; | |
983 | } | |
984 | } | |
985 | ||
986 | #else | |
987 | ||
988 | static inline void xfrm_sk_free_policy(struct sock *sk) {} | |
989 | static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } | |
990 | static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } | |
991 | static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } | |
992 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
993 | { | |
994 | return 1; | |
995 | } | |
996 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
997 | { | |
998 | return 1; | |
999 | } | |
1000 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) | |
1001 | { | |
1002 | return 1; | |
1003 | } | |
d5422efe HX |
1004 | static inline int xfrm_decode_session_reverse(struct sk_buff *skb, |
1005 | struct flowi *fl, | |
1006 | unsigned int family) | |
1007 | { | |
1008 | return -ENOSYS; | |
1009 | } | |
1010 | static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, | |
1011 | struct sk_buff *skb) | |
1012 | { | |
1013 | return 1; | |
1014 | } | |
1015 | static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, | |
1016 | struct sk_buff *skb) | |
1017 | { | |
1018 | return 1; | |
1019 | } | |
1da177e4 LT |
1020 | #endif |
1021 | ||
1022 | static __inline__ | |
1023 | xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) | |
1024 | { | |
1025 | switch (family){ | |
1026 | case AF_INET: | |
1027 | return (xfrm_address_t *)&fl->fl4_dst; | |
1028 | case AF_INET6: | |
1029 | return (xfrm_address_t *)&fl->fl6_dst; | |
1030 | } | |
1031 | return NULL; | |
1032 | } | |
1033 | ||
1034 | static __inline__ | |
1035 | xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) | |
1036 | { | |
1037 | switch (family){ | |
1038 | case AF_INET: | |
1039 | return (xfrm_address_t *)&fl->fl4_src; | |
1040 | case AF_INET6: | |
1041 | return (xfrm_address_t *)&fl->fl6_src; | |
1042 | } | |
1043 | return NULL; | |
1044 | } | |
1045 | ||
1046 | static __inline__ int | |
1047 | __xfrm4_state_addr_check(struct xfrm_state *x, | |
1048 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
1049 | { | |
1050 | if (daddr->a4 == x->id.daddr.a4 && | |
1051 | (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) | |
1052 | return 1; | |
1053 | return 0; | |
1054 | } | |
1055 | ||
1056 | static __inline__ int | |
1057 | __xfrm6_state_addr_check(struct xfrm_state *x, | |
1058 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
1059 | { | |
1060 | if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && | |
1061 | (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| | |
1062 | ipv6_addr_any((struct in6_addr *)saddr) || | |
1063 | ipv6_addr_any((struct in6_addr *)&x->props.saddr))) | |
1064 | return 1; | |
1065 | return 0; | |
1066 | } | |
1067 | ||
1068 | static __inline__ int | |
1069 | xfrm_state_addr_check(struct xfrm_state *x, | |
1070 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
1071 | unsigned short family) | |
1072 | { | |
1073 | switch (family) { | |
1074 | case AF_INET: | |
1075 | return __xfrm4_state_addr_check(x, daddr, saddr); | |
1076 | case AF_INET6: | |
1077 | return __xfrm6_state_addr_check(x, daddr, saddr); | |
1078 | } | |
1079 | return 0; | |
1080 | } | |
1081 | ||
e53820de MN |
1082 | static __inline__ int |
1083 | xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl, | |
1084 | unsigned short family) | |
1085 | { | |
1086 | switch (family) { | |
1087 | case AF_INET: | |
1088 | return __xfrm4_state_addr_check(x, | |
1089 | (xfrm_address_t *)&fl->fl4_dst, | |
1090 | (xfrm_address_t *)&fl->fl4_src); | |
1091 | case AF_INET6: | |
1092 | return __xfrm6_state_addr_check(x, | |
1093 | (xfrm_address_t *)&fl->fl6_dst, | |
1094 | (xfrm_address_t *)&fl->fl6_src); | |
1095 | } | |
1096 | return 0; | |
1097 | } | |
1098 | ||
1da177e4 LT |
1099 | static inline int xfrm_state_kern(struct xfrm_state *x) |
1100 | { | |
1101 | return atomic_read(&x->tunnel_users); | |
1102 | } | |
1103 | ||
5794708f MN |
1104 | static inline int xfrm_id_proto_match(u8 proto, u8 userproto) |
1105 | { | |
dc00a525 MN |
1106 | return (!userproto || proto == userproto || |
1107 | (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || | |
1108 | proto == IPPROTO_ESP || | |
1109 | proto == IPPROTO_COMP))); | |
5794708f MN |
1110 | } |
1111 | ||
1da177e4 LT |
1112 | /* |
1113 | * xfrm algorithm information | |
1114 | */ | |
1a6509d9 HX |
1115 | struct xfrm_algo_aead_info { |
1116 | u16 icv_truncbits; | |
1117 | }; | |
1118 | ||
1da177e4 LT |
1119 | struct xfrm_algo_auth_info { |
1120 | u16 icv_truncbits; | |
1121 | u16 icv_fullbits; | |
1122 | }; | |
1123 | ||
1124 | struct xfrm_algo_encr_info { | |
1125 | u16 blockbits; | |
1126 | u16 defkeybits; | |
1127 | }; | |
1128 | ||
1129 | struct xfrm_algo_comp_info { | |
1130 | u16 threshold; | |
1131 | }; | |
1132 | ||
1133 | struct xfrm_algo_desc { | |
1134 | char *name; | |
04ff1260 | 1135 | char *compat; |
1da177e4 LT |
1136 | u8 available:1; |
1137 | union { | |
1a6509d9 | 1138 | struct xfrm_algo_aead_info aead; |
1da177e4 LT |
1139 | struct xfrm_algo_auth_info auth; |
1140 | struct xfrm_algo_encr_info encr; | |
1141 | struct xfrm_algo_comp_info comp; | |
1142 | } uinfo; | |
1143 | struct sadb_alg desc; | |
1144 | }; | |
1145 | ||
1146 | /* XFRM tunnel handlers. */ | |
1147 | struct xfrm_tunnel { | |
1148 | int (*handler)(struct sk_buff *skb); | |
d2acc347 HX |
1149 | int (*err_handler)(struct sk_buff *skb, __u32 info); |
1150 | ||
1151 | struct xfrm_tunnel *next; | |
1152 | int priority; | |
1da177e4 LT |
1153 | }; |
1154 | ||
1155 | struct xfrm6_tunnel { | |
d2acc347 HX |
1156 | int (*handler)(struct sk_buff *skb); |
1157 | int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
04ce6909 | 1158 | int type, int code, int offset, __be32 info); |
d2acc347 HX |
1159 | struct xfrm6_tunnel *next; |
1160 | int priority; | |
1da177e4 LT |
1161 | }; |
1162 | ||
1163 | extern void xfrm_init(void); | |
1164 | extern void xfrm4_init(void); | |
1da177e4 LT |
1165 | extern void xfrm_state_init(void); |
1166 | extern void xfrm4_state_init(void); | |
c35b7e72 DL |
1167 | #ifdef CONFIG_XFRM |
1168 | extern int xfrm6_init(void); | |
1169 | extern void xfrm6_fini(void); | |
0013caba | 1170 | extern int xfrm6_state_init(void); |
1da177e4 | 1171 | extern void xfrm6_state_fini(void); |
c35b7e72 DL |
1172 | #else |
1173 | static inline int xfrm6_init(void) | |
1174 | { | |
1175 | return 0; | |
1176 | } | |
1177 | static inline void xfrm6_fini(void) | |
1178 | { | |
1179 | ; | |
1180 | } | |
1181 | #endif | |
1da177e4 | 1182 | |
558f82ef MN |
1183 | #ifdef CONFIG_XFRM_STATISTICS |
1184 | extern int xfrm_proc_init(void); | |
1185 | #endif | |
1186 | ||
1da177e4 LT |
1187 | extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); |
1188 | extern struct xfrm_state *xfrm_state_alloc(void); | |
1189 | extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
1190 | struct flowi *fl, struct xfrm_tmpl *tmpl, | |
1191 | struct xfrm_policy *pol, int *err, | |
1192 | unsigned short family); | |
628529b6 JHS |
1193 | extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr, |
1194 | xfrm_address_t *saddr, | |
1195 | unsigned short family, | |
1196 | u8 mode, u8 proto, u32 reqid); | |
1da177e4 LT |
1197 | extern int xfrm_state_check_expire(struct xfrm_state *x); |
1198 | extern void xfrm_state_insert(struct xfrm_state *x); | |
1199 | extern int xfrm_state_add(struct xfrm_state *x); | |
1200 | extern int xfrm_state_update(struct xfrm_state *x); | |
a94cfd19 | 1201 | extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family); |
eb2971b6 | 1202 | extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family); |
41a49cc3 MN |
1203 | #ifdef CONFIG_XFRM_SUB_POLICY |
1204 | extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, | |
1205 | int n, unsigned short family); | |
1206 | extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, | |
1207 | int n, unsigned short family); | |
1208 | #else | |
1209 | static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, | |
1210 | int n, unsigned short family) | |
1211 | { | |
1212 | return -ENOSYS; | |
1213 | } | |
1214 | ||
1215 | static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, | |
1216 | int n, unsigned short family) | |
1217 | { | |
1218 | return -ENOSYS; | |
1219 | } | |
1220 | #endif | |
af11e316 JHS |
1221 | |
1222 | struct xfrmk_sadinfo { | |
1223 | u32 sadhcnt; /* current hash bkts */ | |
1224 | u32 sadhmcnt; /* max allowed hash bkts */ | |
1225 | u32 sadcnt; /* current running count */ | |
1226 | }; | |
1227 | ||
5a6d3416 JHS |
1228 | struct xfrmk_spdinfo { |
1229 | u32 incnt; | |
1230 | u32 outcnt; | |
1231 | u32 fwdcnt; | |
1232 | u32 inscnt; | |
1233 | u32 outscnt; | |
1234 | u32 fwdscnt; | |
1235 | u32 spdhcnt; | |
1236 | u32 spdhmcnt; | |
1237 | }; | |
1238 | ||
1da177e4 | 1239 | extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); |
26b15dad | 1240 | extern int xfrm_state_delete(struct xfrm_state *x); |
4aa2e62c | 1241 | extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info); |
af11e316 | 1242 | extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si); |
5a6d3416 | 1243 | extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si); |
afeb14b4 PM |
1244 | extern int xfrm_replay_check(struct xfrm_state *x, |
1245 | struct sk_buff *skb, __be32 seq); | |
61f4627b | 1246 | extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); |
f8cd5488 | 1247 | extern void xfrm_replay_notify(struct xfrm_state *x, int event); |
1da177e4 | 1248 | extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); |
72cb6962 | 1249 | extern int xfrm_init_state(struct xfrm_state *x); |
227620e2 | 1250 | extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb); |
716062fd HX |
1251 | extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, |
1252 | int encap_type); | |
1bf06cd2 | 1253 | extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr); |
c6581a45 | 1254 | extern int xfrm_output_resume(struct sk_buff *skb, int err); |
406ef77c | 1255 | extern int xfrm_output(struct sk_buff *skb); |
36cf9acf | 1256 | extern int xfrm4_extract_header(struct sk_buff *skb); |
227620e2 | 1257 | extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); |
c4541b41 HX |
1258 | extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, |
1259 | int encap_type); | |
716062fd | 1260 | extern int xfrm4_transport_finish(struct sk_buff *skb, int async); |
1da177e4 | 1261 | extern int xfrm4_rcv(struct sk_buff *skb); |
c4541b41 HX |
1262 | |
1263 | static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) | |
1264 | { | |
1265 | return xfrm4_rcv_encap(skb, nexthdr, spi, 0); | |
1266 | } | |
1267 | ||
36cf9acf HX |
1268 | extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb); |
1269 | extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb); | |
1da177e4 | 1270 | extern int xfrm4_output(struct sk_buff *skb); |
c0d56408 KM |
1271 | extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); |
1272 | extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); | |
36cf9acf | 1273 | extern int xfrm6_extract_header(struct sk_buff *skb); |
227620e2 | 1274 | extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); |
33b5ecb8 | 1275 | extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi); |
716062fd | 1276 | extern int xfrm6_transport_finish(struct sk_buff *skb, int async); |
e5bbef20 | 1277 | extern int xfrm6_rcv(struct sk_buff *skb); |
fbd9a5b4 MN |
1278 | extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, |
1279 | xfrm_address_t *saddr, u8 proto); | |
73d605d1 KM |
1280 | extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); |
1281 | extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); | |
8c689a6e | 1282 | extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); |
1da177e4 | 1283 | extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); |
8c689a6e | 1284 | extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); |
36cf9acf HX |
1285 | extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb); |
1286 | extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb); | |
1da177e4 | 1287 | extern int xfrm6_output(struct sk_buff *skb); |
aee5adb4 MN |
1288 | extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, |
1289 | u8 **prevhdr); | |
1da177e4 LT |
1290 | |
1291 | #ifdef CONFIG_XFRM | |
067b207b | 1292 | extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 1293 | extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); |
1da177e4 LT |
1294 | #else |
1295 | static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) | |
1296 | { | |
1297 | return -ENOPROTOOPT; | |
1298 | } | |
1299 | ||
067b207b | 1300 | static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
1301 | { |
1302 | /* should not happen */ | |
1303 | kfree_skb(skb); | |
1304 | return 0; | |
1305 | } | |
1da177e4 LT |
1306 | #endif |
1307 | ||
dd0fc66f | 1308 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); |
4e81bb83 | 1309 | extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *); |
1da177e4 | 1310 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); |
4e81bb83 MN |
1311 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
1312 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
1313 | struct xfrm_sec_ctx *ctx, int delete, |
1314 | int *err); | |
1315 | struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err); | |
4aa2e62c | 1316 | int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); |
1da177e4 | 1317 | u32 xfrm_get_acqseq(void); |
658b219e | 1318 | extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); |
161a09e7 JL |
1319 | struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, |
1320 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
1da177e4 | 1321 | int create, unsigned short family); |
1da177e4 | 1322 | extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); |
5b368e61 VY |
1323 | extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, |
1324 | struct flowi *fl, int family, int strict); | |
1da177e4 | 1325 | |
80c9abaa SS |
1326 | #ifdef CONFIG_XFRM_MIGRATE |
1327 | extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
1328 | struct xfrm_migrate *m, int num_bundles); | |
1329 | extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m); | |
1330 | extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x, | |
1331 | struct xfrm_migrate *m); | |
1332 | extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
1333 | struct xfrm_migrate *m, int num_bundles); | |
1334 | #endif | |
1335 | ||
1da177e4 | 1336 | extern wait_queue_head_t km_waitq; |
5d36b180 | 1337 | extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); |
6c5c8ca7 | 1338 | extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); |
97a64b45 | 1339 | extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); |
1da177e4 LT |
1340 | |
1341 | extern void xfrm_input_init(void); | |
6067b2ba | 1342 | extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); |
1da177e4 LT |
1343 | |
1344 | extern void xfrm_probe_algs(void); | |
1345 | extern int xfrm_count_auth_supported(void); | |
1346 | extern int xfrm_count_enc_supported(void); | |
1347 | extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); | |
1348 | extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); | |
1349 | extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); | |
1350 | extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); | |
1351 | extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); | |
1352 | extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); | |
1353 | extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); | |
1354 | extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); | |
1a6509d9 HX |
1355 | extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len, |
1356 | int probe); | |
1da177e4 | 1357 | |
07d4ee58 | 1358 | struct hash_desc; |
9409f38a | 1359 | struct scatterlist; |
07d4ee58 HX |
1360 | typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, |
1361 | unsigned int); | |
1da177e4 | 1362 | |
07d4ee58 HX |
1363 | extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm, |
1364 | int offset, int len, icv_update_fn_t icv_update); | |
1da177e4 LT |
1365 | |
1366 | static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, | |
1367 | int family) | |
1368 | { | |
1369 | switch (family) { | |
1370 | default: | |
1371 | case AF_INET: | |
8c689a6e | 1372 | return (__force __u32)a->a4 - (__force __u32)b->a4; |
1da177e4 LT |
1373 | case AF_INET6: |
1374 | return ipv6_addr_cmp((struct in6_addr *)a, | |
1375 | (struct in6_addr *)b); | |
1376 | } | |
1377 | } | |
1378 | ||
77d8d7a6 HX |
1379 | static inline int xfrm_policy_id2dir(u32 index) |
1380 | { | |
1381 | return index & 7; | |
1382 | } | |
1383 | ||
f8cd5488 JHS |
1384 | static inline int xfrm_aevent_is_on(void) |
1385 | { | |
be33690d PM |
1386 | struct sock *nlsk; |
1387 | int ret = 0; | |
1388 | ||
1389 | rcu_read_lock(); | |
1390 | nlsk = rcu_dereference(xfrm_nl); | |
1391 | if (nlsk) | |
1392 | ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); | |
1393 | rcu_read_unlock(); | |
1394 | return ret; | |
f8cd5488 JHS |
1395 | } |
1396 | ||
0f99be0d ED |
1397 | static inline int xfrm_alg_len(struct xfrm_algo *alg) |
1398 | { | |
1399 | return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); | |
1400 | } | |
1401 | ||
80c9abaa SS |
1402 | #ifdef CONFIG_XFRM_MIGRATE |
1403 | static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) | |
1404 | { | |
0f99be0d | 1405 | return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); |
80c9abaa SS |
1406 | } |
1407 | ||
1408 | static inline void xfrm_states_put(struct xfrm_state **states, int n) | |
1409 | { | |
1410 | int i; | |
1411 | for (i = 0; i < n; i++) | |
1412 | xfrm_state_put(*(states + i)); | |
1413 | } | |
1414 | ||
1415 | static inline void xfrm_states_delete(struct xfrm_state **states, int n) | |
1416 | { | |
1417 | int i; | |
1418 | for (i = 0; i < n; i++) | |
1419 | xfrm_state_delete(*(states + i)); | |
1420 | } | |
1421 | #endif | |
f8cd5488 | 1422 | |
00501121 HX |
1423 | static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) |
1424 | { | |
1425 | return skb->sp->xvec[skb->sp->len - 1]; | |
1426 | } | |
1427 | ||
1da177e4 | 1428 | #endif /* _NET_XFRM_H */ |