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 | ||
313 | __u32 reqid; | |
314 | ||
7e49e6de | 315 | /* Mode: transport, tunnel etc. */ |
1da177e4 LT |
316 | __u8 mode; |
317 | ||
318 | /* Sharing mode: unique, this session only, this user only etc. */ | |
319 | __u8 share; | |
320 | ||
321 | /* May skip this transfomration if no SA is found */ | |
322 | __u8 optional; | |
323 | ||
324 | /* Bit mask of algos allowed for acquisition */ | |
325 | __u32 aalgos; | |
326 | __u32 ealgos; | |
327 | __u32 calgos; | |
328 | }; | |
329 | ||
622dc828 | 330 | #define XFRM_MAX_DEPTH 6 |
1da177e4 LT |
331 | |
332 | struct xfrm_policy | |
333 | { | |
334 | struct xfrm_policy *next; | |
2518c7c2 DM |
335 | struct hlist_node bydst; |
336 | struct hlist_node byidx; | |
1da177e4 LT |
337 | |
338 | /* This lock only affects elements except for entry. */ | |
339 | rwlock_t lock; | |
340 | atomic_t refcnt; | |
341 | struct timer_list timer; | |
342 | ||
4e81bb83 | 343 | u8 type; |
1da177e4 LT |
344 | u32 priority; |
345 | u32 index; | |
346 | struct xfrm_selector selector; | |
347 | struct xfrm_lifetime_cfg lft; | |
348 | struct xfrm_lifetime_cur curlft; | |
349 | struct dst_entry *bundles; | |
350 | __u16 family; | |
351 | __u8 action; | |
352 | __u8 flags; | |
353 | __u8 dead; | |
354 | __u8 xfrm_nr; | |
df71837d | 355 | struct xfrm_sec_ctx *security; |
1da177e4 LT |
356 | struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; |
357 | }; | |
358 | ||
f8cd5488 JHS |
359 | #define XFRM_KM_TIMEOUT 30 |
360 | /* which seqno */ | |
361 | #define XFRM_REPLAY_SEQ 1 | |
362 | #define XFRM_REPLAY_OSEQ 2 | |
363 | #define XFRM_REPLAY_SEQ_MASK 3 | |
364 | /* what happened */ | |
365 | #define XFRM_REPLAY_UPDATE XFRM_AE_CR | |
366 | #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE | |
367 | ||
368 | /* default aevent timeout in units of 100ms */ | |
369 | #define XFRM_AE_ETIME 10 | |
370 | /* Async Event timer multiplier */ | |
371 | #define XFRM_AE_ETH_M 10 | |
372 | /* default seq threshold size */ | |
373 | #define XFRM_AE_SEQT_SIZE 2 | |
1da177e4 LT |
374 | |
375 | struct xfrm_mgr | |
376 | { | |
377 | struct list_head list; | |
378 | char *id; | |
26b15dad | 379 | int (*notify)(struct xfrm_state *x, struct km_event *c); |
1da177e4 | 380 | int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); |
cb969f07 | 381 | struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); |
5d36b180 | 382 | int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); |
26b15dad | 383 | int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); |
97a64b45 | 384 | int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); |
1da177e4 LT |
385 | }; |
386 | ||
387 | extern int xfrm_register_km(struct xfrm_mgr *km); | |
388 | extern int xfrm_unregister_km(struct xfrm_mgr *km); | |
389 | ||
2518c7c2 | 390 | extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
1da177e4 LT |
391 | |
392 | static inline void xfrm_pol_hold(struct xfrm_policy *policy) | |
393 | { | |
394 | if (likely(policy != NULL)) | |
395 | atomic_inc(&policy->refcnt); | |
396 | } | |
397 | ||
398 | extern void __xfrm_policy_destroy(struct xfrm_policy *policy); | |
399 | ||
400 | static inline void xfrm_pol_put(struct xfrm_policy *policy) | |
401 | { | |
402 | if (atomic_dec_and_test(&policy->refcnt)) | |
403 | __xfrm_policy_destroy(policy); | |
404 | } | |
405 | ||
4e81bb83 MN |
406 | #ifdef CONFIG_XFRM_SUB_POLICY |
407 | static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) | |
408 | { | |
409 | int i; | |
410 | for (i = npols - 1; i >= 0; --i) | |
411 | xfrm_pol_put(pols[i]); | |
412 | } | |
413 | #else | |
414 | static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) | |
415 | { | |
416 | xfrm_pol_put(pols[0]); | |
417 | } | |
418 | #endif | |
419 | ||
1da177e4 LT |
420 | extern void __xfrm_state_destroy(struct xfrm_state *); |
421 | ||
21380b81 HX |
422 | static inline void __xfrm_state_put(struct xfrm_state *x) |
423 | { | |
424 | atomic_dec(&x->refcnt); | |
425 | } | |
426 | ||
1da177e4 LT |
427 | static inline void xfrm_state_put(struct xfrm_state *x) |
428 | { | |
429 | if (atomic_dec_and_test(&x->refcnt)) | |
430 | __xfrm_state_destroy(x); | |
431 | } | |
432 | ||
433 | static inline void xfrm_state_hold(struct xfrm_state *x) | |
434 | { | |
435 | atomic_inc(&x->refcnt); | |
436 | } | |
437 | ||
438 | static __inline__ int addr_match(void *token1, void *token2, int prefixlen) | |
439 | { | |
5f19343f AV |
440 | __be32 *a1 = token1; |
441 | __be32 *a2 = token2; | |
1da177e4 LT |
442 | int pdw; |
443 | int pbi; | |
444 | ||
445 | pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ | |
446 | pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ | |
447 | ||
448 | if (pdw) | |
449 | if (memcmp(a1, a2, pdw << 2)) | |
450 | return 0; | |
451 | ||
452 | if (pbi) { | |
5f19343f | 453 | __be32 mask; |
1da177e4 LT |
454 | |
455 | mask = htonl((0xffffffff) << (32 - pbi)); | |
456 | ||
457 | if ((a1[pdw] ^ a2[pdw]) & mask) | |
458 | return 0; | |
459 | } | |
460 | ||
461 | return 1; | |
462 | } | |
463 | ||
464 | static __inline__ | |
f9d07e41 | 465 | __be16 xfrm_flowi_sport(struct flowi *fl) |
1da177e4 | 466 | { |
f9d07e41 | 467 | __be16 port; |
1da177e4 LT |
468 | switch(fl->proto) { |
469 | case IPPROTO_TCP: | |
470 | case IPPROTO_UDP: | |
ba4e58ec | 471 | case IPPROTO_UDPLITE: |
1da177e4 LT |
472 | case IPPROTO_SCTP: |
473 | port = fl->fl_ip_sport; | |
474 | break; | |
475 | case IPPROTO_ICMP: | |
476 | case IPPROTO_ICMPV6: | |
477 | port = htons(fl->fl_icmp_type); | |
478 | break; | |
2ce4272a MN |
479 | #ifdef CONFIG_IPV6_MIP6 |
480 | case IPPROTO_MH: | |
481 | port = htons(fl->fl_mh_type); | |
482 | break; | |
483 | #endif | |
1da177e4 LT |
484 | default: |
485 | port = 0; /*XXX*/ | |
486 | } | |
487 | return port; | |
488 | } | |
489 | ||
490 | static __inline__ | |
f9d07e41 | 491 | __be16 xfrm_flowi_dport(struct flowi *fl) |
1da177e4 | 492 | { |
f9d07e41 | 493 | __be16 port; |
1da177e4 LT |
494 | switch(fl->proto) { |
495 | case IPPROTO_TCP: | |
496 | case IPPROTO_UDP: | |
ba4e58ec | 497 | case IPPROTO_UDPLITE: |
1da177e4 LT |
498 | case IPPROTO_SCTP: |
499 | port = fl->fl_ip_dport; | |
500 | break; | |
501 | case IPPROTO_ICMP: | |
502 | case IPPROTO_ICMPV6: | |
503 | port = htons(fl->fl_icmp_code); | |
504 | break; | |
505 | default: | |
506 | port = 0; /*XXX*/ | |
507 | } | |
508 | return port; | |
509 | } | |
510 | ||
77681021 AM |
511 | extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, |
512 | unsigned short family); | |
1da177e4 | 513 | |
df71837d TJ |
514 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
515 | /* If neither has a context --> match | |
516 | * Otherwise, both must have a context and the sids, doi, alg must match | |
517 | */ | |
518 | static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) | |
519 | { | |
520 | return ((!s1 && !s2) || | |
521 | (s1 && s2 && | |
522 | (s1->ctx_sid == s2->ctx_sid) && | |
523 | (s1->ctx_doi == s2->ctx_doi) && | |
524 | (s1->ctx_alg == s2->ctx_alg))); | |
525 | } | |
526 | #else | |
527 | static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) | |
528 | { | |
529 | return 1; | |
530 | } | |
531 | #endif | |
532 | ||
1da177e4 LT |
533 | /* A struct encoding bundle of transformations to apply to some set of flow. |
534 | * | |
535 | * dst->child points to the next element of bundle. | |
536 | * dst->xfrm points to an instanse of transformer. | |
537 | * | |
538 | * Due to unfortunate limitations of current routing cache, which we | |
539 | * have no time to fix, it mirrors struct rtable and bound to the same | |
540 | * routing key, including saddr,daddr. However, we can have many of | |
541 | * bundles differing by session id. All the bundles grow from a parent | |
542 | * policy rule. | |
543 | */ | |
544 | struct xfrm_dst | |
545 | { | |
546 | union { | |
547 | struct xfrm_dst *next; | |
548 | struct dst_entry dst; | |
549 | struct rtable rt; | |
550 | struct rt6_info rt6; | |
551 | } u; | |
552 | struct dst_entry *route; | |
9d4a706d | 553 | u32 genid; |
1da177e4 LT |
554 | u32 route_mtu_cached; |
555 | u32 child_mtu_cached; | |
92d63dec HY |
556 | u32 route_cookie; |
557 | u32 path_cookie; | |
1da177e4 LT |
558 | }; |
559 | ||
aabc9761 HX |
560 | static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) |
561 | { | |
562 | dst_release(xdst->route); | |
563 | if (likely(xdst->u.dst.xfrm)) | |
564 | xfrm_state_put(xdst->u.dst.xfrm); | |
565 | } | |
566 | ||
567 | extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); | |
568 | ||
1da177e4 LT |
569 | struct sec_path |
570 | { | |
571 | atomic_t refcnt; | |
572 | int len; | |
dbe5b4aa | 573 | struct xfrm_state *xvec[XFRM_MAX_DEPTH]; |
1da177e4 LT |
574 | }; |
575 | ||
576 | static inline struct sec_path * | |
577 | secpath_get(struct sec_path *sp) | |
578 | { | |
579 | if (sp) | |
580 | atomic_inc(&sp->refcnt); | |
581 | return sp; | |
582 | } | |
583 | ||
584 | extern void __secpath_destroy(struct sec_path *sp); | |
585 | ||
586 | static inline void | |
587 | secpath_put(struct sec_path *sp) | |
588 | { | |
589 | if (sp && atomic_dec_and_test(&sp->refcnt)) | |
590 | __secpath_destroy(sp); | |
591 | } | |
592 | ||
593 | extern struct sec_path *secpath_dup(struct sec_path *src); | |
594 | ||
595 | static inline void | |
596 | secpath_reset(struct sk_buff *skb) | |
597 | { | |
598 | #ifdef CONFIG_XFRM | |
599 | secpath_put(skb->sp); | |
600 | skb->sp = NULL; | |
601 | #endif | |
602 | } | |
603 | ||
a1e59abf PM |
604 | static inline int |
605 | xfrm_addr_any(xfrm_address_t *addr, unsigned short family) | |
606 | { | |
607 | switch (family) { | |
608 | case AF_INET: | |
609 | return addr->a4 == 0; | |
610 | case AF_INET6: | |
611 | return ipv6_addr_any((struct in6_addr *)&addr->a6); | |
612 | } | |
613 | return 0; | |
614 | } | |
615 | ||
1da177e4 LT |
616 | static inline int |
617 | __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) | |
618 | { | |
619 | return (tmpl->saddr.a4 && | |
620 | tmpl->saddr.a4 != x->props.saddr.a4); | |
621 | } | |
622 | ||
623 | static inline int | |
624 | __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) | |
625 | { | |
626 | return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && | |
627 | ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); | |
628 | } | |
629 | ||
630 | static inline int | |
631 | xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) | |
632 | { | |
633 | switch (family) { | |
634 | case AF_INET: | |
635 | return __xfrm4_state_addr_cmp(tmpl, x); | |
636 | case AF_INET6: | |
637 | return __xfrm6_state_addr_cmp(tmpl, x); | |
638 | } | |
639 | return !0; | |
640 | } | |
641 | ||
642 | #ifdef CONFIG_XFRM | |
643 | ||
644 | extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); | |
645 | ||
646 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) | |
647 | { | |
648 | if (sk && sk->sk_policy[XFRM_POLICY_IN]) | |
649 | return __xfrm_policy_check(sk, dir, skb, family); | |
4e81bb83 | 650 | |
2518c7c2 | 651 | return (!xfrm_policy_count[dir] && !skb->sp) || |
1da177e4 LT |
652 | (skb->dst->flags & DST_NOPOLICY) || |
653 | __xfrm_policy_check(sk, dir, skb, family); | |
654 | } | |
655 | ||
656 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
657 | { | |
658 | return xfrm_policy_check(sk, dir, skb, AF_INET); | |
659 | } | |
660 | ||
661 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
662 | { | |
663 | return xfrm_policy_check(sk, dir, skb, AF_INET6); | |
664 | } | |
665 | ||
3e3850e9 | 666 | extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); |
1da177e4 LT |
667 | extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); |
668 | ||
669 | static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
670 | { | |
2518c7c2 | 671 | return !xfrm_policy_count[XFRM_POLICY_OUT] || |
1da177e4 LT |
672 | (skb->dst->flags & DST_NOXFRM) || |
673 | __xfrm_route_forward(skb, family); | |
674 | } | |
675 | ||
676 | static inline int xfrm4_route_forward(struct sk_buff *skb) | |
677 | { | |
678 | return xfrm_route_forward(skb, AF_INET); | |
679 | } | |
680 | ||
681 | static inline int xfrm6_route_forward(struct sk_buff *skb) | |
682 | { | |
683 | return xfrm_route_forward(skb, AF_INET6); | |
684 | } | |
685 | ||
686 | extern int __xfrm_sk_clone_policy(struct sock *sk); | |
687 | ||
688 | static inline int xfrm_sk_clone_policy(struct sock *sk) | |
689 | { | |
690 | if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) | |
691 | return __xfrm_sk_clone_policy(sk); | |
692 | return 0; | |
693 | } | |
694 | ||
4666faab | 695 | extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); |
1da177e4 LT |
696 | |
697 | static inline void xfrm_sk_free_policy(struct sock *sk) | |
698 | { | |
699 | if (unlikely(sk->sk_policy[0] != NULL)) { | |
700 | xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); | |
701 | sk->sk_policy[0] = NULL; | |
702 | } | |
703 | if (unlikely(sk->sk_policy[1] != NULL)) { | |
704 | xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); | |
705 | sk->sk_policy[1] = NULL; | |
706 | } | |
707 | } | |
708 | ||
709 | #else | |
710 | ||
711 | static inline void xfrm_sk_free_policy(struct sock *sk) {} | |
712 | static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } | |
713 | static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } | |
714 | static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } | |
715 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
716 | { | |
717 | return 1; | |
718 | } | |
719 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
720 | { | |
721 | return 1; | |
722 | } | |
723 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) | |
724 | { | |
725 | return 1; | |
726 | } | |
727 | #endif | |
728 | ||
729 | static __inline__ | |
730 | xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) | |
731 | { | |
732 | switch (family){ | |
733 | case AF_INET: | |
734 | return (xfrm_address_t *)&fl->fl4_dst; | |
735 | case AF_INET6: | |
736 | return (xfrm_address_t *)&fl->fl6_dst; | |
737 | } | |
738 | return NULL; | |
739 | } | |
740 | ||
741 | static __inline__ | |
742 | xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) | |
743 | { | |
744 | switch (family){ | |
745 | case AF_INET: | |
746 | return (xfrm_address_t *)&fl->fl4_src; | |
747 | case AF_INET6: | |
748 | return (xfrm_address_t *)&fl->fl6_src; | |
749 | } | |
750 | return NULL; | |
751 | } | |
752 | ||
753 | static __inline__ int | |
754 | __xfrm4_state_addr_check(struct xfrm_state *x, | |
755 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
756 | { | |
757 | if (daddr->a4 == x->id.daddr.a4 && | |
758 | (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) | |
759 | return 1; | |
760 | return 0; | |
761 | } | |
762 | ||
763 | static __inline__ int | |
764 | __xfrm6_state_addr_check(struct xfrm_state *x, | |
765 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
766 | { | |
767 | if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && | |
768 | (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| | |
769 | ipv6_addr_any((struct in6_addr *)saddr) || | |
770 | ipv6_addr_any((struct in6_addr *)&x->props.saddr))) | |
771 | return 1; | |
772 | return 0; | |
773 | } | |
774 | ||
775 | static __inline__ int | |
776 | xfrm_state_addr_check(struct xfrm_state *x, | |
777 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
778 | unsigned short family) | |
779 | { | |
780 | switch (family) { | |
781 | case AF_INET: | |
782 | return __xfrm4_state_addr_check(x, daddr, saddr); | |
783 | case AF_INET6: | |
784 | return __xfrm6_state_addr_check(x, daddr, saddr); | |
785 | } | |
786 | return 0; | |
787 | } | |
788 | ||
e53820de MN |
789 | static __inline__ int |
790 | xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl, | |
791 | unsigned short family) | |
792 | { | |
793 | switch (family) { | |
794 | case AF_INET: | |
795 | return __xfrm4_state_addr_check(x, | |
796 | (xfrm_address_t *)&fl->fl4_dst, | |
797 | (xfrm_address_t *)&fl->fl4_src); | |
798 | case AF_INET6: | |
799 | return __xfrm6_state_addr_check(x, | |
800 | (xfrm_address_t *)&fl->fl6_dst, | |
801 | (xfrm_address_t *)&fl->fl6_src); | |
802 | } | |
803 | return 0; | |
804 | } | |
805 | ||
1da177e4 LT |
806 | static inline int xfrm_state_kern(struct xfrm_state *x) |
807 | { | |
808 | return atomic_read(&x->tunnel_users); | |
809 | } | |
810 | ||
5794708f MN |
811 | static inline int xfrm_id_proto_match(u8 proto, u8 userproto) |
812 | { | |
dc00a525 MN |
813 | return (!userproto || proto == userproto || |
814 | (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || | |
815 | proto == IPPROTO_ESP || | |
816 | proto == IPPROTO_COMP))); | |
5794708f MN |
817 | } |
818 | ||
1da177e4 LT |
819 | /* |
820 | * xfrm algorithm information | |
821 | */ | |
822 | struct xfrm_algo_auth_info { | |
823 | u16 icv_truncbits; | |
824 | u16 icv_fullbits; | |
825 | }; | |
826 | ||
827 | struct xfrm_algo_encr_info { | |
828 | u16 blockbits; | |
829 | u16 defkeybits; | |
830 | }; | |
831 | ||
832 | struct xfrm_algo_comp_info { | |
833 | u16 threshold; | |
834 | }; | |
835 | ||
836 | struct xfrm_algo_desc { | |
837 | char *name; | |
04ff1260 | 838 | char *compat; |
1da177e4 LT |
839 | u8 available:1; |
840 | union { | |
841 | struct xfrm_algo_auth_info auth; | |
842 | struct xfrm_algo_encr_info encr; | |
843 | struct xfrm_algo_comp_info comp; | |
844 | } uinfo; | |
845 | struct sadb_alg desc; | |
846 | }; | |
847 | ||
848 | /* XFRM tunnel handlers. */ | |
849 | struct xfrm_tunnel { | |
850 | int (*handler)(struct sk_buff *skb); | |
d2acc347 HX |
851 | int (*err_handler)(struct sk_buff *skb, __u32 info); |
852 | ||
853 | struct xfrm_tunnel *next; | |
854 | int priority; | |
1da177e4 LT |
855 | }; |
856 | ||
857 | struct xfrm6_tunnel { | |
d2acc347 HX |
858 | int (*handler)(struct sk_buff *skb); |
859 | int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
04ce6909 | 860 | int type, int code, int offset, __be32 info); |
d2acc347 HX |
861 | struct xfrm6_tunnel *next; |
862 | int priority; | |
1da177e4 LT |
863 | }; |
864 | ||
865 | extern void xfrm_init(void); | |
866 | extern void xfrm4_init(void); | |
867 | extern void xfrm6_init(void); | |
868 | extern void xfrm6_fini(void); | |
869 | extern void xfrm_state_init(void); | |
870 | extern void xfrm4_state_init(void); | |
1da177e4 LT |
871 | extern void xfrm6_state_init(void); |
872 | extern void xfrm6_state_fini(void); | |
873 | ||
874 | extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); | |
875 | extern struct xfrm_state *xfrm_state_alloc(void); | |
876 | extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
877 | struct flowi *fl, struct xfrm_tmpl *tmpl, | |
878 | struct xfrm_policy *pol, int *err, | |
879 | unsigned short family); | |
880 | extern int xfrm_state_check_expire(struct xfrm_state *x); | |
881 | extern void xfrm_state_insert(struct xfrm_state *x); | |
882 | extern int xfrm_state_add(struct xfrm_state *x); | |
883 | extern int xfrm_state_update(struct xfrm_state *x); | |
a94cfd19 | 884 | extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family); |
eb2971b6 | 885 | extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family); |
41a49cc3 MN |
886 | #ifdef CONFIG_XFRM_SUB_POLICY |
887 | extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, | |
888 | int n, unsigned short family); | |
889 | extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, | |
890 | int n, unsigned short family); | |
891 | #else | |
892 | static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, | |
893 | int n, unsigned short family) | |
894 | { | |
895 | return -ENOSYS; | |
896 | } | |
897 | ||
898 | static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, | |
899 | int n, unsigned short family) | |
900 | { | |
901 | return -ENOSYS; | |
902 | } | |
903 | #endif | |
1da177e4 | 904 | extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); |
26b15dad | 905 | extern int xfrm_state_delete(struct xfrm_state *x); |
1da177e4 | 906 | extern void xfrm_state_flush(u8 proto); |
a252cc23 | 907 | extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq); |
61f4627b | 908 | extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq); |
f8cd5488 | 909 | extern void xfrm_replay_notify(struct xfrm_state *x, int event); |
1da177e4 LT |
910 | extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); |
911 | extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); | |
72cb6962 | 912 | extern int xfrm_init_state(struct xfrm_state *x); |
1da177e4 LT |
913 | extern int xfrm4_rcv(struct sk_buff *skb); |
914 | extern int xfrm4_output(struct sk_buff *skb); | |
915 | extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler); | |
916 | extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler); | |
a252cc23 | 917 | extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi); |
951dbc8a | 918 | extern int xfrm6_rcv(struct sk_buff **pskb); |
fbd9a5b4 MN |
919 | extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, |
920 | xfrm_address_t *saddr, u8 proto); | |
1da177e4 LT |
921 | extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler); |
922 | extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler); | |
8c689a6e | 923 | extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); |
1da177e4 | 924 | extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); |
8c689a6e | 925 | extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); |
1da177e4 | 926 | extern int xfrm6_output(struct sk_buff *skb); |
aee5adb4 MN |
927 | extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, |
928 | u8 **prevhdr); | |
1da177e4 LT |
929 | |
930 | #ifdef CONFIG_XFRM | |
931 | extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type); | |
932 | extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); | |
933 | extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); | |
934 | #else | |
935 | static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) | |
936 | { | |
937 | return -ENOPROTOOPT; | |
938 | } | |
939 | ||
940 | static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) | |
941 | { | |
942 | /* should not happen */ | |
943 | kfree_skb(skb); | |
944 | return 0; | |
945 | } | |
946 | static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) | |
947 | { | |
948 | return -EINVAL; | |
949 | } | |
950 | #endif | |
951 | ||
dd0fc66f | 952 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); |
4e81bb83 | 953 | extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *); |
1da177e4 | 954 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); |
4e81bb83 MN |
955 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
956 | struct xfrm_selector *sel, | |
df71837d | 957 | struct xfrm_sec_ctx *ctx, int delete); |
4e81bb83 MN |
958 | struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete); |
959 | void xfrm_policy_flush(u8 type); | |
1da177e4 | 960 | u32 xfrm_get_acqseq(void); |
26977b4e | 961 | void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi); |
1da177e4 LT |
962 | struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, |
963 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
964 | int create, unsigned short family); | |
4e81bb83 | 965 | extern void xfrm_policy_flush(u8 type); |
1da177e4 | 966 | extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); |
5b368e61 VY |
967 | extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst, |
968 | struct flowi *fl, int family, int strict); | |
1da177e4 LT |
969 | extern void xfrm_init_pmtu(struct dst_entry *dst); |
970 | ||
971 | extern wait_queue_head_t km_waitq; | |
5d36b180 | 972 | extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); |
6c5c8ca7 | 973 | extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); |
97a64b45 | 974 | extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); |
1da177e4 LT |
975 | |
976 | extern void xfrm_input_init(void); | |
6067b2ba | 977 | extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); |
1da177e4 LT |
978 | |
979 | extern void xfrm_probe_algs(void); | |
980 | extern int xfrm_count_auth_supported(void); | |
981 | extern int xfrm_count_enc_supported(void); | |
982 | extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); | |
983 | extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); | |
984 | extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); | |
985 | extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); | |
986 | extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); | |
987 | extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); | |
988 | extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); | |
989 | extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); | |
990 | ||
07d4ee58 | 991 | struct hash_desc; |
9409f38a | 992 | struct scatterlist; |
07d4ee58 HX |
993 | typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *, |
994 | unsigned int); | |
1da177e4 | 995 | |
07d4ee58 HX |
996 | extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm, |
997 | int offset, int len, icv_update_fn_t icv_update); | |
1da177e4 LT |
998 | |
999 | static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, | |
1000 | int family) | |
1001 | { | |
1002 | switch (family) { | |
1003 | default: | |
1004 | case AF_INET: | |
8c689a6e | 1005 | return (__force __u32)a->a4 - (__force __u32)b->a4; |
1da177e4 LT |
1006 | case AF_INET6: |
1007 | return ipv6_addr_cmp((struct in6_addr *)a, | |
1008 | (struct in6_addr *)b); | |
1009 | } | |
1010 | } | |
1011 | ||
77d8d7a6 HX |
1012 | static inline int xfrm_policy_id2dir(u32 index) |
1013 | { | |
1014 | return index & 7; | |
1015 | } | |
1016 | ||
f8cd5488 JHS |
1017 | static inline int xfrm_aevent_is_on(void) |
1018 | { | |
be33690d PM |
1019 | struct sock *nlsk; |
1020 | int ret = 0; | |
1021 | ||
1022 | rcu_read_lock(); | |
1023 | nlsk = rcu_dereference(xfrm_nl); | |
1024 | if (nlsk) | |
1025 | ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); | |
1026 | rcu_read_unlock(); | |
1027 | return ret; | |
f8cd5488 JHS |
1028 | } |
1029 | ||
1030 | static inline void xfrm_aevent_doreplay(struct xfrm_state *x) | |
1031 | { | |
1032 | if (xfrm_aevent_is_on()) | |
1033 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); | |
1034 | } | |
1035 | ||
1036 | ||
1da177e4 | 1037 | #endif /* _NET_XFRM_H */ |