Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _NET_XFRM_H |
2 | #define _NET_XFRM_H | |
3 | ||
aabc9761 | 4 | #include <linux/compiler.h> |
14c85021 | 5 | #include <linux/in.h> |
1da177e4 LT |
6 | #include <linux/xfrm.h> |
7 | #include <linux/spinlock.h> | |
8 | #include <linux/list.h> | |
9 | #include <linux/skbuff.h> | |
14c85021 | 10 | #include <linux/socket.h> |
1da177e4 | 11 | #include <linux/pfkeyv2.h> |
5794708f | 12 | #include <linux/ipsec.h> |
1da177e4 | 13 | #include <linux/in6.h> |
4a3e2f71 | 14 | #include <linux/mutex.h> |
1da177e4 LT |
15 | |
16 | #include <net/sock.h> | |
17 | #include <net/dst.h> | |
18 | #include <net/route.h> | |
19 | #include <net/ipv6.h> | |
20 | #include <net/ip6_fib.h> | |
21 | ||
22 | #define XFRM_ALIGN8(len) (((len) + 7) & ~7) | |
b59f45d0 HX |
23 | #define MODULE_ALIAS_XFRM_MODE(family, encap) \ |
24 | MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) | |
1da177e4 | 25 | |
f8cd5488 JHS |
26 | extern struct sock *xfrm_nl; |
27 | extern u32 sysctl_xfrm_aevent_etime; | |
28 | extern u32 sysctl_xfrm_aevent_rseqth; | |
29 | ||
4a3e2f71 | 30 | extern struct mutex xfrm_cfg_mutex; |
1da177e4 LT |
31 | |
32 | /* Organization of SPD aka "XFRM rules" | |
33 | ------------------------------------ | |
34 | ||
35 | Basic objects: | |
36 | - policy rule, struct xfrm_policy (=SPD entry) | |
37 | - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) | |
38 | - instance of a transformer, struct xfrm_state (=SA) | |
39 | - template to clone xfrm_state, struct xfrm_tmpl | |
40 | ||
41 | SPD is plain linear list of xfrm_policy rules, ordered by priority. | |
42 | (To be compatible with existing pfkeyv2 implementations, | |
43 | many rules with priority of 0x7fffffff are allowed to exist and | |
44 | such rules are ordered in an unpredictable way, thanks to bsd folks.) | |
45 | ||
46 | Lookup is plain linear search until the first match with selector. | |
47 | ||
48 | If "action" is "block", then we prohibit the flow, otherwise: | |
49 | if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, | |
50 | policy entry has list of up to XFRM_MAX_DEPTH transformations, | |
51 | described by templates xfrm_tmpl. Each template is resolved | |
52 | to a complete xfrm_state (see below) and we pack bundle of transformations | |
53 | to a dst_entry returned to requestor. | |
54 | ||
55 | dst -. xfrm .-> xfrm_state #1 | |
56 | |---. child .-> dst -. xfrm .-> xfrm_state #2 | |
57 | |---. child .-> dst -. xfrm .-> xfrm_state #3 | |
58 | |---. child .-> NULL | |
59 | ||
60 | Bundles are cached at xrfm_policy struct (field ->bundles). | |
61 | ||
62 | ||
63 | Resolution of xrfm_tmpl | |
64 | ----------------------- | |
65 | Template contains: | |
66 | 1. ->mode Mode: transport or tunnel | |
67 | 2. ->id.proto Protocol: AH/ESP/IPCOMP | |
68 | 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. | |
69 | Q: allow to resolve security gateway? | |
70 | 4. ->id.spi If not zero, static SPI. | |
71 | 5. ->saddr Local tunnel endpoint, ignored for transport mode. | |
72 | 6. ->algos List of allowed algos. Plain bitmask now. | |
73 | Q: ealgos, aalgos, calgos. What a mess... | |
74 | 7. ->share Sharing mode. | |
75 | Q: how to implement private sharing mode? To add struct sock* to | |
76 | flow id? | |
77 | ||
78 | Having this template we search through SAD searching for entries | |
79 | with appropriate mode/proto/algo, permitted by selector. | |
80 | If no appropriate entry found, it is requested from key manager. | |
81 | ||
82 | PROBLEMS: | |
83 | Q: How to find all the bundles referring to a physical path for | |
84 | PMTU discovery? Seems, dst should contain list of all parents... | |
85 | and enter to infinite locking hierarchy disaster. | |
86 | No! It is easier, we will not search for them, let them find us. | |
87 | We add genid to each dst plus pointer to genid of raw IP route, | |
88 | pmtu disc will update pmtu on raw IP route and increase its genid. | |
89 | dst_check() will see this for top level and trigger resyncing | |
90 | metrics. Plus, it will be made via sk->sk_dst_cache. Solved. | |
91 | */ | |
92 | ||
93 | /* Full description of state of transformer. */ | |
94 | struct xfrm_state | |
95 | { | |
96 | /* Note: bydst is re-used during gc */ | |
8f126e37 DM |
97 | struct hlist_node bydst; |
98 | struct hlist_node bysrc; | |
99 | struct hlist_node byspi; | |
1da177e4 LT |
100 | |
101 | atomic_t refcnt; | |
102 | spinlock_t lock; | |
103 | ||
104 | struct xfrm_id id; | |
105 | struct xfrm_selector sel; | |
106 | ||
9d4a706d DM |
107 | u32 genid; |
108 | ||
1da177e4 LT |
109 | /* Key manger bits */ |
110 | struct { | |
111 | u8 state; | |
112 | u8 dying; | |
113 | u32 seq; | |
114 | } km; | |
115 | ||
116 | /* Parameters of this state. */ | |
117 | struct { | |
118 | u32 reqid; | |
119 | u8 mode; | |
120 | u8 replay_window; | |
121 | u8 aalgo, ealgo, calgo; | |
122 | u8 flags; | |
123 | u16 family; | |
124 | xfrm_address_t saddr; | |
125 | int header_len; | |
126 | int trailer_len; | |
127 | } props; | |
128 | ||
129 | struct xfrm_lifetime_cfg lft; | |
130 | ||
131 | /* Data for transformer */ | |
132 | struct xfrm_algo *aalg; | |
133 | struct xfrm_algo *ealg; | |
134 | struct xfrm_algo *calg; | |
135 | ||
136 | /* Data for encapsulator */ | |
137 | struct xfrm_encap_tmpl *encap; | |
138 | ||
060f02a3 NT |
139 | /* Data for care-of address */ |
140 | xfrm_address_t *coaddr; | |
141 | ||
1da177e4 LT |
142 | /* IPComp needs an IPIP tunnel for handling uncompressed packets */ |
143 | struct xfrm_state *tunnel; | |
144 | ||
145 | /* If a tunnel, number of users + 1 */ | |
146 | atomic_t tunnel_users; | |
147 | ||
148 | /* State for replay detection */ | |
149 | struct xfrm_replay_state replay; | |
150 | ||
f8cd5488 JHS |
151 | /* Replay detection state at the time we sent the last notification */ |
152 | struct xfrm_replay_state preplay; | |
153 | ||
2717096a JHS |
154 | /* internal flag that only holds state for delayed aevent at the |
155 | * moment | |
156 | */ | |
157 | u32 xflags; | |
158 | ||
f8cd5488 JHS |
159 | /* Replay detection notification settings */ |
160 | u32 replay_maxage; | |
161 | u32 replay_maxdiff; | |
162 | ||
163 | /* Replay detection notification timer */ | |
164 | struct timer_list rtimer; | |
165 | ||
1da177e4 LT |
166 | /* Statistics */ |
167 | struct xfrm_stats stats; | |
168 | ||
169 | struct xfrm_lifetime_cur curlft; | |
170 | struct timer_list timer; | |
171 | ||
9afaca05 MN |
172 | /* Last used time */ |
173 | u64 lastused; | |
174 | ||
1da177e4 LT |
175 | /* Reference to data common to all the instances of this |
176 | * transformer. */ | |
177 | struct xfrm_type *type; | |
b59f45d0 | 178 | struct xfrm_mode *mode; |
1da177e4 | 179 | |
df71837d TJ |
180 | /* Security context */ |
181 | struct xfrm_sec_ctx *security; | |
182 | ||
1da177e4 LT |
183 | /* Private data of this transformer, format is opaque, |
184 | * interpreted by xfrm_type methods. */ | |
185 | void *data; | |
186 | }; | |
187 | ||
2717096a JHS |
188 | /* xflags - make enum if more show up */ |
189 | #define XFRM_TIME_DEFER 1 | |
190 | ||
1da177e4 LT |
191 | enum { |
192 | XFRM_STATE_VOID, | |
193 | XFRM_STATE_ACQ, | |
194 | XFRM_STATE_VALID, | |
195 | XFRM_STATE_ERROR, | |
196 | XFRM_STATE_EXPIRED, | |
197 | XFRM_STATE_DEAD | |
198 | }; | |
199 | ||
26b15dad JHS |
200 | /* callback structure passed from either netlink or pfkey */ |
201 | struct km_event | |
202 | { | |
bf08867f HX |
203 | union { |
204 | u32 hard; | |
205 | u32 proto; | |
206 | u32 byid; | |
f8cd5488 | 207 | u32 aevent; |
f7b6983f | 208 | u32 type; |
bf08867f HX |
209 | } data; |
210 | ||
26b15dad JHS |
211 | u32 seq; |
212 | u32 pid; | |
213 | u32 event; | |
214 | }; | |
215 | ||
1da177e4 LT |
216 | struct xfrm_type; |
217 | struct xfrm_dst; | |
218 | struct xfrm_policy_afinfo { | |
219 | unsigned short family; | |
73654d61 | 220 | struct xfrm_type *type_map[IPPROTO_MAX]; |
b59f45d0 | 221 | struct xfrm_mode *mode_map[XFRM_MODE_MAX]; |
1da177e4 LT |
222 | struct dst_ops *dst_ops; |
223 | void (*garbage_collect)(void); | |
224 | int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); | |
a1e59abf | 225 | int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr); |
1da177e4 LT |
226 | struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); |
227 | int (*bundle_create)(struct xfrm_policy *policy, | |
228 | struct xfrm_state **xfrm, | |
229 | int nx, | |
230 | struct flowi *fl, | |
231 | struct dst_entry **dst_p); | |
232 | void (*decode_session)(struct sk_buff *skb, | |
233 | struct flowi *fl); | |
234 | }; | |
235 | ||
236 | extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); | |
237 | extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); | |
26b15dad JHS |
238 | extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); |
239 | extern void km_state_notify(struct xfrm_state *x, struct km_event *c); | |
1da177e4 LT |
240 | #define XFRM_ACQ_EXPIRES 30 |
241 | ||
242 | struct xfrm_tmpl; | |
980ebd25 | 243 | extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d JHS |
244 | extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
245 | extern int __xfrm_state_delete(struct xfrm_state *x); | |
246 | ||
1da177e4 LT |
247 | struct xfrm_state_afinfo { |
248 | unsigned short family; | |
d094cd83 | 249 | int (*init_flags)(struct xfrm_state *x); |
1da177e4 LT |
250 | void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, |
251 | struct xfrm_tmpl *tmpl, | |
252 | xfrm_address_t *daddr, xfrm_address_t *saddr); | |
41a49cc3 MN |
253 | int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n); |
254 | int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n); | |
1da177e4 LT |
255 | }; |
256 | ||
257 | extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); | |
258 | extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); | |
259 | ||
260 | extern void xfrm_state_delete_tunnel(struct xfrm_state *x); | |
261 | ||
1da177e4 LT |
262 | struct xfrm_type |
263 | { | |
264 | char *description; | |
265 | struct module *owner; | |
266 | __u8 proto; | |
1b5c2299 MN |
267 | __u8 flags; |
268 | #define XFRM_TYPE_NON_FRAGMENT 1 | |
1da177e4 | 269 | |
72cb6962 | 270 | int (*init_state)(struct xfrm_state *x); |
1da177e4 | 271 | void (*destructor)(struct xfrm_state *); |
e695633e | 272 | int (*input)(struct xfrm_state *, struct sk_buff *skb); |
1da177e4 | 273 | int (*output)(struct xfrm_state *, struct sk_buff *pskb); |
df0ba92a | 274 | int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *); |
aee5adb4 | 275 | int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **); |
99505a84 MN |
276 | xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *); |
277 | xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *); | |
1da177e4 LT |
278 | /* Estimate maximal size of result of transformation of a dgram */ |
279 | u32 (*get_max_size)(struct xfrm_state *, int size); | |
280 | }; | |
281 | ||
1da177e4 LT |
282 | extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); |
283 | extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); | |
284 | extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); | |
285 | extern void xfrm_put_type(struct xfrm_type *type); | |
286 | ||
b59f45d0 HX |
287 | struct xfrm_mode { |
288 | int (*input)(struct xfrm_state *x, struct sk_buff *skb); | |
eb878e84 | 289 | int (*output)(struct xfrm_state *x,struct sk_buff *skb); |
b59f45d0 HX |
290 | |
291 | struct module *owner; | |
292 | unsigned int encap; | |
293 | }; | |
294 | ||
295 | extern int xfrm_register_mode(struct xfrm_mode *mode, int family); | |
296 | extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family); | |
297 | extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family); | |
298 | extern void xfrm_put_mode(struct xfrm_mode *mode); | |
299 | ||
1da177e4 LT |
300 | struct xfrm_tmpl |
301 | { | |
302 | /* id in template is interpreted as: | |
303 | * daddr - destination of tunnel, may be zero for transport mode. | |
304 | * spi - zero to acquire spi. Not zero if spi is static, then | |
305 | * daddr must be fixed too. | |
306 | * proto - AH/ESP/IPCOMP | |
307 | */ | |
308 | struct xfrm_id id; | |
309 | ||
310 | /* Source address of tunnel. Ignored, if it is not a tunnel. */ | |
311 | xfrm_address_t saddr; | |
312 | ||
76b3f055 MK |
313 | unsigned short encap_family; |
314 | ||
1da177e4 LT |
315 | __u32 reqid; |
316 | ||
7e49e6de | 317 | /* Mode: transport, tunnel etc. */ |
1da177e4 LT |
318 | __u8 mode; |
319 | ||
320 | /* Sharing mode: unique, this session only, this user only etc. */ | |
321 | __u8 share; | |
322 | ||
323 | /* May skip this transfomration if no SA is found */ | |
324 | __u8 optional; | |
325 | ||
326 | /* Bit mask of algos allowed for acquisition */ | |
327 | __u32 aalgos; | |
328 | __u32 ealgos; | |
329 | __u32 calgos; | |
330 | }; | |
331 | ||
622dc828 | 332 | #define XFRM_MAX_DEPTH 6 |
1da177e4 LT |
333 | |
334 | struct xfrm_policy | |
335 | { | |
336 | struct xfrm_policy *next; | |
2518c7c2 DM |
337 | struct hlist_node bydst; |
338 | struct hlist_node byidx; | |
1da177e4 LT |
339 | |
340 | /* This lock only affects elements except for entry. */ | |
341 | rwlock_t lock; | |
342 | atomic_t refcnt; | |
343 | struct timer_list timer; | |
344 | ||
345 | u32 priority; | |
346 | u32 index; | |
347 | struct xfrm_selector selector; | |
348 | struct xfrm_lifetime_cfg lft; | |
349 | struct xfrm_lifetime_cur curlft; | |
350 | struct dst_entry *bundles; | |
46ca5f5d ACM |
351 | u16 family; |
352 | u8 type; | |
353 | u8 action; | |
354 | u8 flags; | |
355 | u8 dead; | |
356 | u8 xfrm_nr; | |
357 | /* XXX 1 byte hole, try to pack */ | |
df71837d | 358 | struct xfrm_sec_ctx *security; |
1da177e4 LT |
359 | struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; |
360 | }; | |
361 | ||
f8cd5488 JHS |
362 | #define XFRM_KM_TIMEOUT 30 |
363 | /* which seqno */ | |
364 | #define XFRM_REPLAY_SEQ 1 | |
365 | #define XFRM_REPLAY_OSEQ 2 | |
366 | #define XFRM_REPLAY_SEQ_MASK 3 | |
367 | /* what happened */ | |
368 | #define XFRM_REPLAY_UPDATE XFRM_AE_CR | |
369 | #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE | |
370 | ||
371 | /* default aevent timeout in units of 100ms */ | |
372 | #define XFRM_AE_ETIME 10 | |
373 | /* Async Event timer multiplier */ | |
374 | #define XFRM_AE_ETH_M 10 | |
375 | /* default seq threshold size */ | |
376 | #define XFRM_AE_SEQT_SIZE 2 | |
1da177e4 LT |
377 | |
378 | struct xfrm_mgr | |
379 | { | |
380 | struct list_head list; | |
381 | char *id; | |
26b15dad | 382 | int (*notify)(struct xfrm_state *x, struct km_event *c); |
1da177e4 | 383 | int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); |
cb969f07 | 384 | struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); |
5d36b180 | 385 | int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); |
26b15dad | 386 | int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); |
97a64b45 | 387 | int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); |
1da177e4 LT |
388 | }; |
389 | ||
390 | extern int xfrm_register_km(struct xfrm_mgr *km); | |
391 | extern int xfrm_unregister_km(struct xfrm_mgr *km); | |
392 | ||
2518c7c2 | 393 | extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
1da177e4 | 394 | |
161a09e7 JL |
395 | /* Audit Information */ |
396 | struct xfrm_audit | |
397 | { | |
398 | uid_t loginuid; | |
399 | u32 secid; | |
400 | }; | |
401 | void xfrm_audit_log(uid_t auid, u32 secid, int type, int result, | |
402 | struct xfrm_policy *xp, struct xfrm_state *x); | |
403 | ||
1da177e4 LT |
404 | static inline void xfrm_pol_hold(struct xfrm_policy *policy) |
405 | { | |
406 | if (likely(policy != NULL)) | |
407 | atomic_inc(&policy->refcnt); | |
408 | } | |
409 | ||
410 | extern void __xfrm_policy_destroy(struct xfrm_policy *policy); | |
411 | ||
412 | static inline void xfrm_pol_put(struct xfrm_policy *policy) | |
413 | { | |
414 | if (atomic_dec_and_test(&policy->refcnt)) | |
415 | __xfrm_policy_destroy(policy); | |
416 | } | |
417 | ||
4e81bb83 MN |
418 | #ifdef CONFIG_XFRM_SUB_POLICY |
419 | static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) | |
420 | { | |
421 | int i; | |
422 | for (i = npols - 1; i >= 0; --i) | |
423 | xfrm_pol_put(pols[i]); | |
424 | } | |
425 | #else | |
426 | static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) | |
427 | { | |
428 | xfrm_pol_put(pols[0]); | |
429 | } | |
430 | #endif | |
431 | ||
1da177e4 LT |
432 | extern void __xfrm_state_destroy(struct xfrm_state *); |
433 | ||
21380b81 HX |
434 | static inline void __xfrm_state_put(struct xfrm_state *x) |
435 | { | |
436 | atomic_dec(&x->refcnt); | |
437 | } | |
438 | ||
1da177e4 LT |
439 | static inline void xfrm_state_put(struct xfrm_state *x) |
440 | { | |
441 | if (atomic_dec_and_test(&x->refcnt)) | |
442 | __xfrm_state_destroy(x); | |
443 | } | |
444 | ||
445 | static inline void xfrm_state_hold(struct xfrm_state *x) | |
446 | { | |
447 | atomic_inc(&x->refcnt); | |
448 | } | |
449 | ||
450 | static __inline__ int addr_match(void *token1, void *token2, int prefixlen) | |
451 | { | |
5f19343f AV |
452 | __be32 *a1 = token1; |
453 | __be32 *a2 = token2; | |
1da177e4 LT |
454 | int pdw; |
455 | int pbi; | |
456 | ||
457 | pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ | |
458 | pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ | |
459 | ||
460 | if (pdw) | |
461 | if (memcmp(a1, a2, pdw << 2)) | |
462 | return 0; | |
463 | ||
464 | if (pbi) { | |
5f19343f | 465 | __be32 mask; |
1da177e4 LT |
466 | |
467 | mask = htonl((0xffffffff) << (32 - pbi)); | |
468 | ||
469 | if ((a1[pdw] ^ a2[pdw]) & mask) | |
470 | return 0; | |
471 | } | |
472 | ||
473 | return 1; | |
474 | } | |
475 | ||
476 | static __inline__ | |
f9d07e41 | 477 | __be16 xfrm_flowi_sport(struct flowi *fl) |
1da177e4 | 478 | { |
f9d07e41 | 479 | __be16 port; |
1da177e4 LT |
480 | switch(fl->proto) { |
481 | case IPPROTO_TCP: | |
482 | case IPPROTO_UDP: | |
ba4e58ec | 483 | case IPPROTO_UDPLITE: |
1da177e4 LT |
484 | case IPPROTO_SCTP: |
485 | port = fl->fl_ip_sport; | |
486 | break; | |
487 | case IPPROTO_ICMP: | |
488 | case IPPROTO_ICMPV6: | |
489 | port = htons(fl->fl_icmp_type); | |
490 | break; | |
2ce4272a MN |
491 | #ifdef CONFIG_IPV6_MIP6 |
492 | case IPPROTO_MH: | |
493 | port = htons(fl->fl_mh_type); | |
494 | break; | |
495 | #endif | |
1da177e4 LT |
496 | default: |
497 | port = 0; /*XXX*/ | |
498 | } | |
499 | return port; | |
500 | } | |
501 | ||
502 | static __inline__ | |
f9d07e41 | 503 | __be16 xfrm_flowi_dport(struct flowi *fl) |
1da177e4 | 504 | { |
f9d07e41 | 505 | __be16 port; |
1da177e4 LT |
506 | switch(fl->proto) { |
507 | case IPPROTO_TCP: | |
508 | case IPPROTO_UDP: | |
ba4e58ec | 509 | case IPPROTO_UDPLITE: |
1da177e4 LT |
510 | case IPPROTO_SCTP: |
511 | port = fl->fl_ip_dport; | |
512 | break; | |
513 | case IPPROTO_ICMP: | |
514 | case IPPROTO_ICMPV6: | |
515 | port = htons(fl->fl_icmp_code); | |
516 | break; | |
517 | default: | |
518 | port = 0; /*XXX*/ | |
519 | } | |
520 | return port; | |
521 | } | |
522 | ||
77681021 AM |
523 | extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, |
524 | unsigned short family); | |
1da177e4 | 525 | |
df71837d TJ |
526 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
527 | /* If neither has a context --> match | |
528 | * Otherwise, both must have a context and the sids, doi, alg must match | |
529 | */ | |
530 | static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) | |
531 | { | |
532 | return ((!s1 && !s2) || | |
533 | (s1 && s2 && | |
534 | (s1->ctx_sid == s2->ctx_sid) && | |
535 | (s1->ctx_doi == s2->ctx_doi) && | |
536 | (s1->ctx_alg == s2->ctx_alg))); | |
537 | } | |
538 | #else | |
539 | static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) | |
540 | { | |
541 | return 1; | |
542 | } | |
543 | #endif | |
544 | ||
1da177e4 LT |
545 | /* A struct encoding bundle of transformations to apply to some set of flow. |
546 | * | |
547 | * dst->child points to the next element of bundle. | |
548 | * dst->xfrm points to an instanse of transformer. | |
549 | * | |
550 | * Due to unfortunate limitations of current routing cache, which we | |
551 | * have no time to fix, it mirrors struct rtable and bound to the same | |
552 | * routing key, including saddr,daddr. However, we can have many of | |
553 | * bundles differing by session id. All the bundles grow from a parent | |
554 | * policy rule. | |
555 | */ | |
556 | struct xfrm_dst | |
557 | { | |
558 | union { | |
559 | struct xfrm_dst *next; | |
560 | struct dst_entry dst; | |
561 | struct rtable rt; | |
562 | struct rt6_info rt6; | |
563 | } u; | |
564 | struct dst_entry *route; | |
9d4a706d | 565 | u32 genid; |
1da177e4 LT |
566 | u32 route_mtu_cached; |
567 | u32 child_mtu_cached; | |
92d63dec HY |
568 | u32 route_cookie; |
569 | u32 path_cookie; | |
1da177e4 LT |
570 | }; |
571 | ||
aabc9761 HX |
572 | static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) |
573 | { | |
574 | dst_release(xdst->route); | |
575 | if (likely(xdst->u.dst.xfrm)) | |
576 | xfrm_state_put(xdst->u.dst.xfrm); | |
577 | } | |
578 | ||
579 | extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); | |
580 | ||
1da177e4 LT |
581 | struct sec_path |
582 | { | |
583 | atomic_t refcnt; | |
584 | int len; | |
dbe5b4aa | 585 | struct xfrm_state *xvec[XFRM_MAX_DEPTH]; |
1da177e4 LT |
586 | }; |
587 | ||
588 | static inline struct sec_path * | |
589 | secpath_get(struct sec_path *sp) | |
590 | { | |
591 | if (sp) | |
592 | atomic_inc(&sp->refcnt); | |
593 | return sp; | |
594 | } | |
595 | ||
596 | extern void __secpath_destroy(struct sec_path *sp); | |
597 | ||
598 | static inline void | |
599 | secpath_put(struct sec_path *sp) | |
600 | { | |
601 | if (sp && atomic_dec_and_test(&sp->refcnt)) | |
602 | __secpath_destroy(sp); | |
603 | } | |
604 | ||
605 | extern struct sec_path *secpath_dup(struct sec_path *src); | |
606 | ||
607 | static inline void | |
608 | secpath_reset(struct sk_buff *skb) | |
609 | { | |
610 | #ifdef CONFIG_XFRM | |
611 | secpath_put(skb->sp); | |
612 | skb->sp = NULL; | |
613 | #endif | |
614 | } | |
615 | ||
a1e59abf PM |
616 | static inline int |
617 | xfrm_addr_any(xfrm_address_t *addr, unsigned short family) | |
618 | { | |
619 | switch (family) { | |
620 | case AF_INET: | |
621 | return addr->a4 == 0; | |
622 | case AF_INET6: | |
623 | return ipv6_addr_any((struct in6_addr *)&addr->a6); | |
624 | } | |
625 | return 0; | |
626 | } | |
627 | ||
1da177e4 LT |
628 | static inline int |
629 | __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) | |
630 | { | |
631 | return (tmpl->saddr.a4 && | |
632 | tmpl->saddr.a4 != x->props.saddr.a4); | |
633 | } | |
634 | ||
635 | static inline int | |
636 | __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) | |
637 | { | |
638 | return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && | |
639 | ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); | |
640 | } | |
641 | ||
642 | static inline int | |
643 | xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) | |
644 | { | |
645 | switch (family) { | |
646 | case AF_INET: | |
647 | return __xfrm4_state_addr_cmp(tmpl, x); | |
648 | case AF_INET6: | |
649 | return __xfrm6_state_addr_cmp(tmpl, x); | |
650 | } | |
651 | return !0; | |
652 | } | |
653 | ||
654 | #ifdef CONFIG_XFRM | |
655 | ||
656 | extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); | |
657 | ||
658 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) | |
659 | { | |
660 | if (sk && sk->sk_policy[XFRM_POLICY_IN]) | |
661 | return __xfrm_policy_check(sk, dir, skb, family); | |
4e81bb83 | 662 | |
2518c7c2 | 663 | return (!xfrm_policy_count[dir] && !skb->sp) || |
1da177e4 LT |
664 | (skb->dst->flags & DST_NOPOLICY) || |
665 | __xfrm_policy_check(sk, dir, skb, family); | |
666 | } | |
667 | ||
668 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
669 | { | |
670 | return xfrm_policy_check(sk, dir, skb, AF_INET); | |
671 | } | |
672 | ||
673 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
674 | { | |
675 | return xfrm_policy_check(sk, dir, skb, AF_INET6); | |
676 | } | |
677 | ||
3e3850e9 | 678 | extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); |
1da177e4 LT |
679 | extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); |
680 | ||
681 | static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
682 | { | |
2518c7c2 | 683 | return !xfrm_policy_count[XFRM_POLICY_OUT] || |
1da177e4 LT |
684 | (skb->dst->flags & DST_NOXFRM) || |
685 | __xfrm_route_forward(skb, family); | |
686 | } | |
687 | ||
688 | static inline int xfrm4_route_forward(struct sk_buff *skb) | |
689 | { | |
690 | return xfrm_route_forward(skb, AF_INET); | |
691 | } | |
692 | ||
693 | static inline int xfrm6_route_forward(struct sk_buff *skb) | |
694 | { | |
695 | return xfrm_route_forward(skb, AF_INET6); | |
696 | } | |
697 | ||
698 | extern int __xfrm_sk_clone_policy(struct sock *sk); | |
699 | ||
700 | static inline int xfrm_sk_clone_policy(struct sock *sk) | |
701 | { | |
702 | if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) | |
703 | return __xfrm_sk_clone_policy(sk); | |
704 | return 0; | |
705 | } | |
706 | ||
4666faab | 707 | extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); |
1da177e4 LT |
708 | |
709 | static inline void xfrm_sk_free_policy(struct sock *sk) | |
710 | { | |
711 | if (unlikely(sk->sk_policy[0] != NULL)) { | |
712 | xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); | |
713 | sk->sk_policy[0] = NULL; | |
714 | } | |
715 | if (unlikely(sk->sk_policy[1] != NULL)) { | |
716 | xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); | |
717 | sk->sk_policy[1] = NULL; | |
718 | } | |
719 | } | |
720 | ||
721 | #else | |
722 | ||
723 | static inline void xfrm_sk_free_policy(struct sock *sk) {} | |
724 | static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } | |
725 | static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } | |
726 | static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } | |
727 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
728 | { | |
729 | return 1; | |
730 | } | |
731 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
732 | { | |
733 | return 1; | |
734 | } | |
735 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) | |
736 | { | |
737 | return 1; | |
738 | } | |
739 | #endif | |
740 | ||
741 | static __inline__ | |
742 | xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) | |
743 | { | |
744 | switch (family){ | |
745 | case AF_INET: | |
746 | return (xfrm_address_t *)&fl->fl4_dst; | |
747 | case AF_INET6: | |
748 | return (xfrm_address_t *)&fl->fl6_dst; | |
749 | } | |
750 | return NULL; | |
751 | } | |
752 | ||
753 | static __inline__ | |
754 | xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) | |
755 | { | |
756 | switch (family){ | |
757 | case AF_INET: | |
758 | return (xfrm_address_t *)&fl->fl4_src; | |
759 | case AF_INET6: | |
760 | return (xfrm_address_t *)&fl->fl6_src; | |
761 | } | |
762 | return NULL; | |
763 | } | |
764 | ||
765 | static __inline__ int | |
766 | __xfrm4_state_addr_check(struct xfrm_state *x, | |
767 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
768 | { | |
769 | if (daddr->a4 == x->id.daddr.a4 && | |
770 | (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) | |
771 | return 1; | |
772 | return 0; | |
773 | } | |
774 | ||
775 | static __inline__ int | |
776 | __xfrm6_state_addr_check(struct xfrm_state *x, | |
777 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
778 | { | |
779 | if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && | |
780 | (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| | |
781 | ipv6_addr_any((struct in6_addr *)saddr) || | |
782 | ipv6_addr_any((struct in6_addr *)&x->props.saddr))) | |
783 | return 1; | |
784 | return 0; | |
785 | } | |
786 | ||
787 | static __inline__ int | |
788 | xfrm_state_addr_check(struct xfrm_state *x, | |
789 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
790 | unsigned short family) | |
791 | { | |
792 | switch (family) { | |
793 | case AF_INET: | |
794 | return __xfrm4_state_addr_check(x, daddr, saddr); | |
795 | case AF_INET6: | |
796 | return __xfrm6_state_addr_check(x, daddr, saddr); | |
797 | } | |
798 | return 0; | |
799 | } | |
800 | ||
e53820de MN |
801 | static __inline__ int |
802 | xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl, | |
803 | unsigned short family) | |
804 | { | |
805 | switch (family) { | |
806 | case AF_INET: | |
807 | return __xfrm4_state_addr_check(x, | |
808 | (xfrm_address_t *)&fl->fl4_dst, | |
809 | (xfrm_address_t *)&fl->fl4_src); | |
810 | case AF_INET6: | |
811 | return __xfrm6_state_addr_check(x, | |
812 | (xfrm_address_t *)&fl->fl6_dst, | |
813 | (xfrm_address_t *)&fl->fl6_src); | |
814 | } | |
815 | return 0; | |
816 | } | |
817 | ||
1da177e4 LT |
818 | static inline int xfrm_state_kern(struct xfrm_state *x) |
819 | { | |
820 | return atomic_read(&x->tunnel_users); | |
821 | } | |
822 | ||
5794708f MN |
823 | static inline int xfrm_id_proto_match(u8 proto, u8 userproto) |
824 | { | |
dc00a525 MN |
825 | return (!userproto || proto == userproto || |
826 | (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || | |
827 | proto == IPPROTO_ESP || | |
828 | proto == IPPROTO_COMP))); | |
5794708f MN |
829 | } |
830 | ||
1da177e4 LT |
831 | /* |
832 | * xfrm algorithm information | |
833 | */ | |
834 | struct xfrm_algo_auth_info { | |
835 | u16 icv_truncbits; | |
836 | u16 icv_fullbits; | |
837 | }; | |
838 | ||
839 | struct xfrm_algo_encr_info { | |
840 | u16 blockbits; | |
841 | u16 defkeybits; | |
842 | }; | |
843 | ||
844 | struct xfrm_algo_comp_info { | |
845 | u16 threshold; | |
846 | }; | |
847 | ||
848 | struct xfrm_algo_desc { | |
849 | char *name; | |
04ff1260 | 850 | char *compat; |
1da177e4 LT |
851 | u8 available:1; |
852 | union { | |
853 | struct xfrm_algo_auth_info auth; | |
854 | struct xfrm_algo_encr_info encr; | |
855 | struct xfrm_algo_comp_info comp; | |
856 | } uinfo; | |
857 | struct sadb_alg desc; | |
858 | }; | |
859 | ||
860 | /* XFRM tunnel handlers. */ | |
861 | struct xfrm_tunnel { | |
862 | int (*handler)(struct sk_buff *skb); | |
d2acc347 HX |
863 | int (*err_handler)(struct sk_buff *skb, __u32 info); |
864 | ||
865 | struct xfrm_tunnel *next; | |
866 | int priority; | |
1da177e4 LT |
867 | }; |
868 | ||
869 | struct xfrm6_tunnel { | |
d2acc347 HX |
870 | int (*handler)(struct sk_buff *skb); |
871 | int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
04ce6909 | 872 | int type, int code, int offset, __be32 info); |
d2acc347 HX |
873 | struct xfrm6_tunnel *next; |
874 | int priority; | |
1da177e4 LT |
875 | }; |
876 | ||
877 | extern void xfrm_init(void); | |
878 | extern void xfrm4_init(void); | |
879 | extern void xfrm6_init(void); | |
880 | extern void xfrm6_fini(void); | |
881 | extern void xfrm_state_init(void); | |
882 | extern void xfrm4_state_init(void); | |
1da177e4 LT |
883 | extern void xfrm6_state_init(void); |
884 | extern void xfrm6_state_fini(void); | |
885 | ||
886 | extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); | |
887 | extern struct xfrm_state *xfrm_state_alloc(void); | |
888 | extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
889 | struct flowi *fl, struct xfrm_tmpl *tmpl, | |
890 | struct xfrm_policy *pol, int *err, | |
891 | unsigned short family); | |
892 | extern int xfrm_state_check_expire(struct xfrm_state *x); | |
893 | extern void xfrm_state_insert(struct xfrm_state *x); | |
894 | extern int xfrm_state_add(struct xfrm_state *x); | |
895 | extern int xfrm_state_update(struct xfrm_state *x); | |
a94cfd19 | 896 | extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family); |
eb2971b6 | 897 | extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family); |
41a49cc3 MN |
898 | #ifdef CONFIG_XFRM_SUB_POLICY |
899 | extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, | |
900 | int n, unsigned short family); | |
901 | extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, | |
902 | int n, unsigned short family); | |
903 | #else | |
904 | static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, | |
905 | int n, unsigned short family) | |
906 | { | |
907 | return -ENOSYS; | |
908 | } | |
909 | ||
910 | static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, | |
911 | int n, unsigned short family) | |
912 | { | |
913 | return -ENOSYS; | |
914 | } | |
915 | #endif | |
1da177e4 | 916 | extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); |
26b15dad | 917 | extern int xfrm_state_delete(struct xfrm_state *x); |
161a09e7 | 918 | extern void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info); |
a252cc23 | 919 | extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq); |
61f4627b | 920 | extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); |
f8cd5488 | 921 | extern void xfrm_replay_notify(struct xfrm_state *x, int event); |
1da177e4 LT |
922 | extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); |
923 | extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); | |
72cb6962 | 924 | extern int xfrm_init_state(struct xfrm_state *x); |
1da177e4 LT |
925 | extern int xfrm4_rcv(struct sk_buff *skb); |
926 | extern int xfrm4_output(struct sk_buff *skb); | |
927 | extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler); | |
928 | extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler); | |
a252cc23 | 929 | extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi); |
951dbc8a | 930 | extern int xfrm6_rcv(struct sk_buff **pskb); |
fbd9a5b4 MN |
931 | extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, |
932 | xfrm_address_t *saddr, u8 proto); | |
1da177e4 LT |
933 | extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler); |
934 | extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler); | |
8c689a6e | 935 | extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); |
1da177e4 | 936 | extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); |
8c689a6e | 937 | extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); |
1da177e4 | 938 | extern int xfrm6_output(struct sk_buff *skb); |
aee5adb4 MN |
939 | extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, |
940 | u8 **prevhdr); | |
1da177e4 LT |
941 | |
942 | #ifdef CONFIG_XFRM | |
943 | extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type); | |
944 | extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); | |
945 | extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); | |
946 | #else | |
947 | static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) | |
948 | { | |
949 | return -ENOPROTOOPT; | |
950 | } | |
951 | ||
952 | static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) | |
953 | { | |
954 | /* should not happen */ | |
955 | kfree_skb(skb); | |
956 | return 0; | |
957 | } | |
958 | static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) | |
959 | { | |
960 | return -EINVAL; | |
961 | } | |
962 | #endif | |
963 | ||
dd0fc66f | 964 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); |
4e81bb83 | 965 | extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *); |
1da177e4 | 966 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); |
4e81bb83 MN |
967 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
968 | struct xfrm_selector *sel, | |
df71837d | 969 | struct xfrm_sec_ctx *ctx, int delete); |
4e81bb83 | 970 | struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete); |
161a09e7 | 971 | void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); |
1da177e4 | 972 | u32 xfrm_get_acqseq(void); |
26977b4e | 973 | void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi); |
161a09e7 JL |
974 | struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, |
975 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
1da177e4 | 976 | int create, unsigned short family); |
161a09e7 | 977 | extern void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info); |
1da177e4 | 978 | extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); |
5b368e61 VY |
979 | extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, |
980 | struct flowi *fl, int family, int strict); | |
1da177e4 LT |
981 | extern void xfrm_init_pmtu(struct dst_entry *dst); |
982 | ||
983 | extern wait_queue_head_t km_waitq; | |
5d36b180 | 984 | extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); |
6c5c8ca7 | 985 | extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); |
97a64b45 | 986 | extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); |
1da177e4 LT |
987 | |
988 | extern void xfrm_input_init(void); | |
6067b2ba | 989 | extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); |
1da177e4 LT |
990 | |
991 | extern void xfrm_probe_algs(void); | |
992 | extern int xfrm_count_auth_supported(void); | |
993 | extern int xfrm_count_enc_supported(void); | |
994 | extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); | |
995 | extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); | |
996 | extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); | |
997 | extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); | |
998 | extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); | |
999 | extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); | |
1000 | extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); | |
1001 | extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); | |
1002 | ||
07d4ee58 | 1003 | struct hash_desc; |
9409f38a | 1004 | struct scatterlist; |
07d4ee58 HX |
1005 | typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, |
1006 | unsigned int); | |
1da177e4 | 1007 | |
07d4ee58 HX |
1008 | extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm, |
1009 | int offset, int len, icv_update_fn_t icv_update); | |
1da177e4 LT |
1010 | |
1011 | static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, | |
1012 | int family) | |
1013 | { | |
1014 | switch (family) { | |
1015 | default: | |
1016 | case AF_INET: | |
8c689a6e | 1017 | return (__force __u32)a->a4 - (__force __u32)b->a4; |
1da177e4 LT |
1018 | case AF_INET6: |
1019 | return ipv6_addr_cmp((struct in6_addr *)a, | |
1020 | (struct in6_addr *)b); | |
1021 | } | |
1022 | } | |
1023 | ||
77d8d7a6 HX |
1024 | static inline int xfrm_policy_id2dir(u32 index) |
1025 | { | |
1026 | return index & 7; | |
1027 | } | |
1028 | ||
f8cd5488 JHS |
1029 | static inline int xfrm_aevent_is_on(void) |
1030 | { | |
be33690d PM |
1031 | struct sock *nlsk; |
1032 | int ret = 0; | |
1033 | ||
1034 | rcu_read_lock(); | |
1035 | nlsk = rcu_dereference(xfrm_nl); | |
1036 | if (nlsk) | |
1037 | ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); | |
1038 | rcu_read_unlock(); | |
1039 | return ret; | |
f8cd5488 JHS |
1040 | } |
1041 | ||
1042 | static inline void xfrm_aevent_doreplay(struct xfrm_state *x) | |
1043 | { | |
1044 | if (xfrm_aevent_is_on()) | |
1045 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); | |
1046 | } | |
1047 | ||
1048 | ||
1da177e4 | 1049 | #endif /* _NET_XFRM_H */ |