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1da177e4 LT |
1 | #ifndef _NET_XFRM_H |
2 | #define _NET_XFRM_H | |
3 | ||
4 | #include <linux/xfrm.h> | |
5 | #include <linux/spinlock.h> | |
6 | #include <linux/list.h> | |
7 | #include <linux/skbuff.h> | |
8 | #include <linux/netdevice.h> | |
9 | #include <linux/crypto.h> | |
10 | #include <linux/pfkeyv2.h> | |
11 | #include <linux/in6.h> | |
12 | ||
13 | #include <net/sock.h> | |
14 | #include <net/dst.h> | |
15 | #include <net/route.h> | |
16 | #include <net/ipv6.h> | |
17 | #include <net/ip6_fib.h> | |
18 | ||
19 | #define XFRM_ALIGN8(len) (((len) + 7) & ~7) | |
20 | ||
21 | extern struct semaphore xfrm_cfg_sem; | |
22 | ||
23 | /* Organization of SPD aka "XFRM rules" | |
24 | ------------------------------------ | |
25 | ||
26 | Basic objects: | |
27 | - policy rule, struct xfrm_policy (=SPD entry) | |
28 | - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) | |
29 | - instance of a transformer, struct xfrm_state (=SA) | |
30 | - template to clone xfrm_state, struct xfrm_tmpl | |
31 | ||
32 | SPD is plain linear list of xfrm_policy rules, ordered by priority. | |
33 | (To be compatible with existing pfkeyv2 implementations, | |
34 | many rules with priority of 0x7fffffff are allowed to exist and | |
35 | such rules are ordered in an unpredictable way, thanks to bsd folks.) | |
36 | ||
37 | Lookup is plain linear search until the first match with selector. | |
38 | ||
39 | If "action" is "block", then we prohibit the flow, otherwise: | |
40 | if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, | |
41 | policy entry has list of up to XFRM_MAX_DEPTH transformations, | |
42 | described by templates xfrm_tmpl. Each template is resolved | |
43 | to a complete xfrm_state (see below) and we pack bundle of transformations | |
44 | to a dst_entry returned to requestor. | |
45 | ||
46 | dst -. xfrm .-> xfrm_state #1 | |
47 | |---. child .-> dst -. xfrm .-> xfrm_state #2 | |
48 | |---. child .-> dst -. xfrm .-> xfrm_state #3 | |
49 | |---. child .-> NULL | |
50 | ||
51 | Bundles are cached at xrfm_policy struct (field ->bundles). | |
52 | ||
53 | ||
54 | Resolution of xrfm_tmpl | |
55 | ----------------------- | |
56 | Template contains: | |
57 | 1. ->mode Mode: transport or tunnel | |
58 | 2. ->id.proto Protocol: AH/ESP/IPCOMP | |
59 | 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. | |
60 | Q: allow to resolve security gateway? | |
61 | 4. ->id.spi If not zero, static SPI. | |
62 | 5. ->saddr Local tunnel endpoint, ignored for transport mode. | |
63 | 6. ->algos List of allowed algos. Plain bitmask now. | |
64 | Q: ealgos, aalgos, calgos. What a mess... | |
65 | 7. ->share Sharing mode. | |
66 | Q: how to implement private sharing mode? To add struct sock* to | |
67 | flow id? | |
68 | ||
69 | Having this template we search through SAD searching for entries | |
70 | with appropriate mode/proto/algo, permitted by selector. | |
71 | If no appropriate entry found, it is requested from key manager. | |
72 | ||
73 | PROBLEMS: | |
74 | Q: How to find all the bundles referring to a physical path for | |
75 | PMTU discovery? Seems, dst should contain list of all parents... | |
76 | and enter to infinite locking hierarchy disaster. | |
77 | No! It is easier, we will not search for them, let them find us. | |
78 | We add genid to each dst plus pointer to genid of raw IP route, | |
79 | pmtu disc will update pmtu on raw IP route and increase its genid. | |
80 | dst_check() will see this for top level and trigger resyncing | |
81 | metrics. Plus, it will be made via sk->sk_dst_cache. Solved. | |
82 | */ | |
83 | ||
84 | /* Full description of state of transformer. */ | |
85 | struct xfrm_state | |
86 | { | |
87 | /* Note: bydst is re-used during gc */ | |
88 | struct list_head bydst; | |
89 | struct list_head byspi; | |
90 | ||
91 | atomic_t refcnt; | |
92 | spinlock_t lock; | |
93 | ||
94 | struct xfrm_id id; | |
95 | struct xfrm_selector sel; | |
96 | ||
97 | /* Key manger bits */ | |
98 | struct { | |
99 | u8 state; | |
100 | u8 dying; | |
101 | u32 seq; | |
102 | } km; | |
103 | ||
104 | /* Parameters of this state. */ | |
105 | struct { | |
106 | u32 reqid; | |
107 | u8 mode; | |
108 | u8 replay_window; | |
109 | u8 aalgo, ealgo, calgo; | |
110 | u8 flags; | |
111 | u16 family; | |
112 | xfrm_address_t saddr; | |
113 | int header_len; | |
114 | int trailer_len; | |
115 | } props; | |
116 | ||
117 | struct xfrm_lifetime_cfg lft; | |
118 | ||
119 | /* Data for transformer */ | |
120 | struct xfrm_algo *aalg; | |
121 | struct xfrm_algo *ealg; | |
122 | struct xfrm_algo *calg; | |
123 | ||
124 | /* Data for encapsulator */ | |
125 | struct xfrm_encap_tmpl *encap; | |
126 | ||
127 | /* IPComp needs an IPIP tunnel for handling uncompressed packets */ | |
128 | struct xfrm_state *tunnel; | |
129 | ||
130 | /* If a tunnel, number of users + 1 */ | |
131 | atomic_t tunnel_users; | |
132 | ||
133 | /* State for replay detection */ | |
134 | struct xfrm_replay_state replay; | |
135 | ||
136 | /* Statistics */ | |
137 | struct xfrm_stats stats; | |
138 | ||
139 | struct xfrm_lifetime_cur curlft; | |
140 | struct timer_list timer; | |
141 | ||
142 | /* Reference to data common to all the instances of this | |
143 | * transformer. */ | |
144 | struct xfrm_type *type; | |
145 | ||
146 | /* Private data of this transformer, format is opaque, | |
147 | * interpreted by xfrm_type methods. */ | |
148 | void *data; | |
149 | }; | |
150 | ||
151 | enum { | |
152 | XFRM_STATE_VOID, | |
153 | XFRM_STATE_ACQ, | |
154 | XFRM_STATE_VALID, | |
155 | XFRM_STATE_ERROR, | |
156 | XFRM_STATE_EXPIRED, | |
157 | XFRM_STATE_DEAD | |
158 | }; | |
159 | ||
160 | struct xfrm_type; | |
161 | struct xfrm_dst; | |
162 | struct xfrm_policy_afinfo { | |
163 | unsigned short family; | |
164 | rwlock_t lock; | |
165 | struct xfrm_type_map *type_map; | |
166 | struct dst_ops *dst_ops; | |
167 | void (*garbage_collect)(void); | |
168 | int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); | |
169 | struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); | |
170 | int (*bundle_create)(struct xfrm_policy *policy, | |
171 | struct xfrm_state **xfrm, | |
172 | int nx, | |
173 | struct flowi *fl, | |
174 | struct dst_entry **dst_p); | |
175 | void (*decode_session)(struct sk_buff *skb, | |
176 | struct flowi *fl); | |
177 | }; | |
178 | ||
179 | extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); | |
180 | extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); | |
181 | ||
182 | #define XFRM_ACQ_EXPIRES 30 | |
183 | ||
184 | struct xfrm_tmpl; | |
185 | struct xfrm_state_afinfo { | |
186 | unsigned short family; | |
187 | rwlock_t lock; | |
188 | struct list_head *state_bydst; | |
189 | struct list_head *state_byspi; | |
190 | void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, | |
191 | struct xfrm_tmpl *tmpl, | |
192 | xfrm_address_t *daddr, xfrm_address_t *saddr); | |
193 | struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto); | |
194 | struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto, | |
195 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
196 | int create); | |
197 | }; | |
198 | ||
199 | extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); | |
200 | extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); | |
201 | ||
202 | extern void xfrm_state_delete_tunnel(struct xfrm_state *x); | |
203 | ||
204 | struct xfrm_decap_state; | |
205 | struct xfrm_type | |
206 | { | |
207 | char *description; | |
208 | struct module *owner; | |
209 | __u8 proto; | |
210 | ||
211 | int (*init_state)(struct xfrm_state *x, void *args); | |
212 | void (*destructor)(struct xfrm_state *); | |
213 | int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb); | |
214 | int (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb); | |
215 | int (*output)(struct xfrm_state *, struct sk_buff *pskb); | |
216 | /* Estimate maximal size of result of transformation of a dgram */ | |
217 | u32 (*get_max_size)(struct xfrm_state *, int size); | |
218 | }; | |
219 | ||
220 | struct xfrm_type_map { | |
221 | rwlock_t lock; | |
222 | struct xfrm_type *map[256]; | |
223 | }; | |
224 | ||
225 | extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); | |
226 | extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); | |
227 | extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); | |
228 | extern void xfrm_put_type(struct xfrm_type *type); | |
229 | ||
230 | struct xfrm_tmpl | |
231 | { | |
232 | /* id in template is interpreted as: | |
233 | * daddr - destination of tunnel, may be zero for transport mode. | |
234 | * spi - zero to acquire spi. Not zero if spi is static, then | |
235 | * daddr must be fixed too. | |
236 | * proto - AH/ESP/IPCOMP | |
237 | */ | |
238 | struct xfrm_id id; | |
239 | ||
240 | /* Source address of tunnel. Ignored, if it is not a tunnel. */ | |
241 | xfrm_address_t saddr; | |
242 | ||
243 | __u32 reqid; | |
244 | ||
245 | /* Mode: transport/tunnel */ | |
246 | __u8 mode; | |
247 | ||
248 | /* Sharing mode: unique, this session only, this user only etc. */ | |
249 | __u8 share; | |
250 | ||
251 | /* May skip this transfomration if no SA is found */ | |
252 | __u8 optional; | |
253 | ||
254 | /* Bit mask of algos allowed for acquisition */ | |
255 | __u32 aalgos; | |
256 | __u32 ealgos; | |
257 | __u32 calgos; | |
258 | }; | |
259 | ||
260 | #define XFRM_MAX_DEPTH 4 | |
261 | ||
262 | struct xfrm_policy | |
263 | { | |
264 | struct xfrm_policy *next; | |
265 | struct list_head list; | |
266 | ||
267 | /* This lock only affects elements except for entry. */ | |
268 | rwlock_t lock; | |
269 | atomic_t refcnt; | |
270 | struct timer_list timer; | |
271 | ||
272 | u32 priority; | |
273 | u32 index; | |
274 | struct xfrm_selector selector; | |
275 | struct xfrm_lifetime_cfg lft; | |
276 | struct xfrm_lifetime_cur curlft; | |
277 | struct dst_entry *bundles; | |
278 | __u16 family; | |
279 | __u8 action; | |
280 | __u8 flags; | |
281 | __u8 dead; | |
282 | __u8 xfrm_nr; | |
283 | struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; | |
284 | }; | |
285 | ||
286 | #define XFRM_KM_TIMEOUT 30 | |
287 | ||
288 | struct xfrm_mgr | |
289 | { | |
290 | struct list_head list; | |
291 | char *id; | |
292 | int (*notify)(struct xfrm_state *x, int event); | |
293 | int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); | |
294 | struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir); | |
295 | int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); | |
296 | int (*notify_policy)(struct xfrm_policy *x, int dir, int event); | |
297 | }; | |
298 | ||
299 | extern int xfrm_register_km(struct xfrm_mgr *km); | |
300 | extern int xfrm_unregister_km(struct xfrm_mgr *km); | |
301 | ||
302 | ||
303 | extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2]; | |
304 | ||
305 | static inline void xfrm_pol_hold(struct xfrm_policy *policy) | |
306 | { | |
307 | if (likely(policy != NULL)) | |
308 | atomic_inc(&policy->refcnt); | |
309 | } | |
310 | ||
311 | extern void __xfrm_policy_destroy(struct xfrm_policy *policy); | |
312 | ||
313 | static inline void xfrm_pol_put(struct xfrm_policy *policy) | |
314 | { | |
315 | if (atomic_dec_and_test(&policy->refcnt)) | |
316 | __xfrm_policy_destroy(policy); | |
317 | } | |
318 | ||
319 | #define XFRM_DST_HSIZE 1024 | |
320 | ||
321 | static __inline__ | |
322 | unsigned __xfrm4_dst_hash(xfrm_address_t *addr) | |
323 | { | |
324 | unsigned h; | |
325 | h = ntohl(addr->a4); | |
326 | h = (h ^ (h>>16)) % XFRM_DST_HSIZE; | |
327 | return h; | |
328 | } | |
329 | ||
330 | static __inline__ | |
331 | unsigned __xfrm6_dst_hash(xfrm_address_t *addr) | |
332 | { | |
333 | unsigned h; | |
334 | h = ntohl(addr->a6[2]^addr->a6[3]); | |
335 | h = (h ^ (h>>16)) % XFRM_DST_HSIZE; | |
336 | return h; | |
337 | } | |
338 | ||
339 | static __inline__ | |
340 | unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family) | |
341 | { | |
342 | switch (family) { | |
343 | case AF_INET: | |
344 | return __xfrm4_dst_hash(addr); | |
345 | case AF_INET6: | |
346 | return __xfrm6_dst_hash(addr); | |
347 | } | |
348 | return 0; | |
349 | } | |
350 | ||
351 | static __inline__ | |
352 | unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) | |
353 | { | |
354 | unsigned h; | |
355 | h = ntohl(addr->a4^spi^proto); | |
356 | h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; | |
357 | return h; | |
358 | } | |
359 | ||
360 | static __inline__ | |
361 | unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) | |
362 | { | |
363 | unsigned h; | |
364 | h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto); | |
365 | h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; | |
366 | return h; | |
367 | } | |
368 | ||
369 | static __inline__ | |
370 | unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family) | |
371 | { | |
372 | switch (family) { | |
373 | case AF_INET: | |
374 | return __xfrm4_spi_hash(addr, spi, proto); | |
375 | case AF_INET6: | |
376 | return __xfrm6_spi_hash(addr, spi, proto); | |
377 | } | |
378 | return 0; /*XXX*/ | |
379 | } | |
380 | ||
381 | extern void __xfrm_state_destroy(struct xfrm_state *); | |
382 | ||
383 | static inline void xfrm_state_put(struct xfrm_state *x) | |
384 | { | |
385 | if (atomic_dec_and_test(&x->refcnt)) | |
386 | __xfrm_state_destroy(x); | |
387 | } | |
388 | ||
389 | static inline void xfrm_state_hold(struct xfrm_state *x) | |
390 | { | |
391 | atomic_inc(&x->refcnt); | |
392 | } | |
393 | ||
394 | static __inline__ int addr_match(void *token1, void *token2, int prefixlen) | |
395 | { | |
396 | __u32 *a1 = token1; | |
397 | __u32 *a2 = token2; | |
398 | int pdw; | |
399 | int pbi; | |
400 | ||
401 | pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ | |
402 | pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ | |
403 | ||
404 | if (pdw) | |
405 | if (memcmp(a1, a2, pdw << 2)) | |
406 | return 0; | |
407 | ||
408 | if (pbi) { | |
409 | __u32 mask; | |
410 | ||
411 | mask = htonl((0xffffffff) << (32 - pbi)); | |
412 | ||
413 | if ((a1[pdw] ^ a2[pdw]) & mask) | |
414 | return 0; | |
415 | } | |
416 | ||
417 | return 1; | |
418 | } | |
419 | ||
420 | static __inline__ | |
421 | u16 xfrm_flowi_sport(struct flowi *fl) | |
422 | { | |
423 | u16 port; | |
424 | switch(fl->proto) { | |
425 | case IPPROTO_TCP: | |
426 | case IPPROTO_UDP: | |
427 | case IPPROTO_SCTP: | |
428 | port = fl->fl_ip_sport; | |
429 | break; | |
430 | case IPPROTO_ICMP: | |
431 | case IPPROTO_ICMPV6: | |
432 | port = htons(fl->fl_icmp_type); | |
433 | break; | |
434 | default: | |
435 | port = 0; /*XXX*/ | |
436 | } | |
437 | return port; | |
438 | } | |
439 | ||
440 | static __inline__ | |
441 | u16 xfrm_flowi_dport(struct flowi *fl) | |
442 | { | |
443 | u16 port; | |
444 | switch(fl->proto) { | |
445 | case IPPROTO_TCP: | |
446 | case IPPROTO_UDP: | |
447 | case IPPROTO_SCTP: | |
448 | port = fl->fl_ip_dport; | |
449 | break; | |
450 | case IPPROTO_ICMP: | |
451 | case IPPROTO_ICMPV6: | |
452 | port = htons(fl->fl_icmp_code); | |
453 | break; | |
454 | default: | |
455 | port = 0; /*XXX*/ | |
456 | } | |
457 | return port; | |
458 | } | |
459 | ||
460 | static inline int | |
461 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
462 | { | |
463 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
464 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
465 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
466 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
467 | (fl->proto == sel->proto || !sel->proto) && | |
468 | (fl->oif == sel->ifindex || !sel->ifindex); | |
469 | } | |
470 | ||
471 | static inline int | |
472 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
473 | { | |
474 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
475 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
476 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
477 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
478 | (fl->proto == sel->proto || !sel->proto) && | |
479 | (fl->oif == sel->ifindex || !sel->ifindex); | |
480 | } | |
481 | ||
482 | static inline int | |
483 | xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
484 | unsigned short family) | |
485 | { | |
486 | switch (family) { | |
487 | case AF_INET: | |
488 | return __xfrm4_selector_match(sel, fl); | |
489 | case AF_INET6: | |
490 | return __xfrm6_selector_match(sel, fl); | |
491 | } | |
492 | return 0; | |
493 | } | |
494 | ||
495 | /* A struct encoding bundle of transformations to apply to some set of flow. | |
496 | * | |
497 | * dst->child points to the next element of bundle. | |
498 | * dst->xfrm points to an instanse of transformer. | |
499 | * | |
500 | * Due to unfortunate limitations of current routing cache, which we | |
501 | * have no time to fix, it mirrors struct rtable and bound to the same | |
502 | * routing key, including saddr,daddr. However, we can have many of | |
503 | * bundles differing by session id. All the bundles grow from a parent | |
504 | * policy rule. | |
505 | */ | |
506 | struct xfrm_dst | |
507 | { | |
508 | union { | |
509 | struct xfrm_dst *next; | |
510 | struct dst_entry dst; | |
511 | struct rtable rt; | |
512 | struct rt6_info rt6; | |
513 | } u; | |
514 | struct dst_entry *route; | |
515 | u32 route_mtu_cached; | |
516 | u32 child_mtu_cached; | |
517 | }; | |
518 | ||
519 | /* Decapsulation state, used by the input to store data during | |
520 | * decapsulation procedure, to be used later (during the policy | |
521 | * check | |
522 | */ | |
523 | struct xfrm_decap_state { | |
524 | char decap_data[20]; | |
525 | __u16 decap_type; | |
526 | }; | |
527 | ||
528 | struct sec_decap_state { | |
529 | struct xfrm_state *xvec; | |
530 | struct xfrm_decap_state decap; | |
531 | }; | |
532 | ||
533 | struct sec_path | |
534 | { | |
535 | atomic_t refcnt; | |
536 | int len; | |
537 | struct sec_decap_state x[XFRM_MAX_DEPTH]; | |
538 | }; | |
539 | ||
540 | static inline struct sec_path * | |
541 | secpath_get(struct sec_path *sp) | |
542 | { | |
543 | if (sp) | |
544 | atomic_inc(&sp->refcnt); | |
545 | return sp; | |
546 | } | |
547 | ||
548 | extern void __secpath_destroy(struct sec_path *sp); | |
549 | ||
550 | static inline void | |
551 | secpath_put(struct sec_path *sp) | |
552 | { | |
553 | if (sp && atomic_dec_and_test(&sp->refcnt)) | |
554 | __secpath_destroy(sp); | |
555 | } | |
556 | ||
557 | extern struct sec_path *secpath_dup(struct sec_path *src); | |
558 | ||
559 | static inline void | |
560 | secpath_reset(struct sk_buff *skb) | |
561 | { | |
562 | #ifdef CONFIG_XFRM | |
563 | secpath_put(skb->sp); | |
564 | skb->sp = NULL; | |
565 | #endif | |
566 | } | |
567 | ||
568 | static inline int | |
569 | __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) | |
570 | { | |
571 | return (tmpl->saddr.a4 && | |
572 | tmpl->saddr.a4 != x->props.saddr.a4); | |
573 | } | |
574 | ||
575 | static inline int | |
576 | __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) | |
577 | { | |
578 | return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && | |
579 | ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); | |
580 | } | |
581 | ||
582 | static inline int | |
583 | xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) | |
584 | { | |
585 | switch (family) { | |
586 | case AF_INET: | |
587 | return __xfrm4_state_addr_cmp(tmpl, x); | |
588 | case AF_INET6: | |
589 | return __xfrm6_state_addr_cmp(tmpl, x); | |
590 | } | |
591 | return !0; | |
592 | } | |
593 | ||
594 | #ifdef CONFIG_XFRM | |
595 | ||
596 | extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); | |
597 | ||
598 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) | |
599 | { | |
600 | if (sk && sk->sk_policy[XFRM_POLICY_IN]) | |
601 | return __xfrm_policy_check(sk, dir, skb, family); | |
602 | ||
603 | return (!xfrm_policy_list[dir] && !skb->sp) || | |
604 | (skb->dst->flags & DST_NOPOLICY) || | |
605 | __xfrm_policy_check(sk, dir, skb, family); | |
606 | } | |
607 | ||
608 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
609 | { | |
610 | return xfrm_policy_check(sk, dir, skb, AF_INET); | |
611 | } | |
612 | ||
613 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
614 | { | |
615 | return xfrm_policy_check(sk, dir, skb, AF_INET6); | |
616 | } | |
617 | ||
618 | ||
619 | extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); | |
620 | ||
621 | static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
622 | { | |
623 | return !xfrm_policy_list[XFRM_POLICY_OUT] || | |
624 | (skb->dst->flags & DST_NOXFRM) || | |
625 | __xfrm_route_forward(skb, family); | |
626 | } | |
627 | ||
628 | static inline int xfrm4_route_forward(struct sk_buff *skb) | |
629 | { | |
630 | return xfrm_route_forward(skb, AF_INET); | |
631 | } | |
632 | ||
633 | static inline int xfrm6_route_forward(struct sk_buff *skb) | |
634 | { | |
635 | return xfrm_route_forward(skb, AF_INET6); | |
636 | } | |
637 | ||
638 | extern int __xfrm_sk_clone_policy(struct sock *sk); | |
639 | ||
640 | static inline int xfrm_sk_clone_policy(struct sock *sk) | |
641 | { | |
642 | if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) | |
643 | return __xfrm_sk_clone_policy(sk); | |
644 | return 0; | |
645 | } | |
646 | ||
647 | extern void xfrm_policy_delete(struct xfrm_policy *pol, int dir); | |
648 | ||
649 | static inline void xfrm_sk_free_policy(struct sock *sk) | |
650 | { | |
651 | if (unlikely(sk->sk_policy[0] != NULL)) { | |
652 | xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); | |
653 | sk->sk_policy[0] = NULL; | |
654 | } | |
655 | if (unlikely(sk->sk_policy[1] != NULL)) { | |
656 | xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); | |
657 | sk->sk_policy[1] = NULL; | |
658 | } | |
659 | } | |
660 | ||
661 | #else | |
662 | ||
663 | static inline void xfrm_sk_free_policy(struct sock *sk) {} | |
664 | static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } | |
665 | static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } | |
666 | static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } | |
667 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
668 | { | |
669 | return 1; | |
670 | } | |
671 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
672 | { | |
673 | return 1; | |
674 | } | |
675 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) | |
676 | { | |
677 | return 1; | |
678 | } | |
679 | #endif | |
680 | ||
681 | static __inline__ | |
682 | xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) | |
683 | { | |
684 | switch (family){ | |
685 | case AF_INET: | |
686 | return (xfrm_address_t *)&fl->fl4_dst; | |
687 | case AF_INET6: | |
688 | return (xfrm_address_t *)&fl->fl6_dst; | |
689 | } | |
690 | return NULL; | |
691 | } | |
692 | ||
693 | static __inline__ | |
694 | xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) | |
695 | { | |
696 | switch (family){ | |
697 | case AF_INET: | |
698 | return (xfrm_address_t *)&fl->fl4_src; | |
699 | case AF_INET6: | |
700 | return (xfrm_address_t *)&fl->fl6_src; | |
701 | } | |
702 | return NULL; | |
703 | } | |
704 | ||
705 | static __inline__ int | |
706 | __xfrm4_state_addr_check(struct xfrm_state *x, | |
707 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
708 | { | |
709 | if (daddr->a4 == x->id.daddr.a4 && | |
710 | (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) | |
711 | return 1; | |
712 | return 0; | |
713 | } | |
714 | ||
715 | static __inline__ int | |
716 | __xfrm6_state_addr_check(struct xfrm_state *x, | |
717 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
718 | { | |
719 | if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && | |
720 | (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| | |
721 | ipv6_addr_any((struct in6_addr *)saddr) || | |
722 | ipv6_addr_any((struct in6_addr *)&x->props.saddr))) | |
723 | return 1; | |
724 | return 0; | |
725 | } | |
726 | ||
727 | static __inline__ int | |
728 | xfrm_state_addr_check(struct xfrm_state *x, | |
729 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
730 | unsigned short family) | |
731 | { | |
732 | switch (family) { | |
733 | case AF_INET: | |
734 | return __xfrm4_state_addr_check(x, daddr, saddr); | |
735 | case AF_INET6: | |
736 | return __xfrm6_state_addr_check(x, daddr, saddr); | |
737 | } | |
738 | return 0; | |
739 | } | |
740 | ||
741 | static inline int xfrm_state_kern(struct xfrm_state *x) | |
742 | { | |
743 | return atomic_read(&x->tunnel_users); | |
744 | } | |
745 | ||
746 | /* | |
747 | * xfrm algorithm information | |
748 | */ | |
749 | struct xfrm_algo_auth_info { | |
750 | u16 icv_truncbits; | |
751 | u16 icv_fullbits; | |
752 | }; | |
753 | ||
754 | struct xfrm_algo_encr_info { | |
755 | u16 blockbits; | |
756 | u16 defkeybits; | |
757 | }; | |
758 | ||
759 | struct xfrm_algo_comp_info { | |
760 | u16 threshold; | |
761 | }; | |
762 | ||
763 | struct xfrm_algo_desc { | |
764 | char *name; | |
765 | u8 available:1; | |
766 | union { | |
767 | struct xfrm_algo_auth_info auth; | |
768 | struct xfrm_algo_encr_info encr; | |
769 | struct xfrm_algo_comp_info comp; | |
770 | } uinfo; | |
771 | struct sadb_alg desc; | |
772 | }; | |
773 | ||
774 | /* XFRM tunnel handlers. */ | |
775 | struct xfrm_tunnel { | |
776 | int (*handler)(struct sk_buff *skb); | |
777 | void (*err_handler)(struct sk_buff *skb, void *info); | |
778 | }; | |
779 | ||
780 | struct xfrm6_tunnel { | |
781 | int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp); | |
782 | void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
783 | int type, int code, int offset, __u32 info); | |
784 | }; | |
785 | ||
786 | extern void xfrm_init(void); | |
787 | extern void xfrm4_init(void); | |
788 | extern void xfrm6_init(void); | |
789 | extern void xfrm6_fini(void); | |
790 | extern void xfrm_state_init(void); | |
791 | extern void xfrm4_state_init(void); | |
792 | extern void xfrm4_state_fini(void); | |
793 | extern void xfrm6_state_init(void); | |
794 | extern void xfrm6_state_fini(void); | |
795 | ||
796 | extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); | |
797 | extern struct xfrm_state *xfrm_state_alloc(void); | |
798 | extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
799 | struct flowi *fl, struct xfrm_tmpl *tmpl, | |
800 | struct xfrm_policy *pol, int *err, | |
801 | unsigned short family); | |
802 | extern int xfrm_state_check_expire(struct xfrm_state *x); | |
803 | extern void xfrm_state_insert(struct xfrm_state *x); | |
804 | extern int xfrm_state_add(struct xfrm_state *x); | |
805 | extern int xfrm_state_update(struct xfrm_state *x); | |
806 | extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family); | |
807 | extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); | |
808 | extern void xfrm_state_delete(struct xfrm_state *x); | |
809 | extern void xfrm_state_flush(u8 proto); | |
810 | extern int xfrm_replay_check(struct xfrm_state *x, u32 seq); | |
811 | extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq); | |
812 | extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); | |
813 | extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); | |
814 | extern int xfrm4_rcv(struct sk_buff *skb); | |
815 | extern int xfrm4_output(struct sk_buff *skb); | |
816 | extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler); | |
817 | extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler); | |
818 | extern int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi); | |
819 | extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp); | |
820 | extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler); | |
821 | extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler); | |
822 | extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); | |
823 | extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); | |
824 | extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); | |
825 | extern int xfrm6_output(struct sk_buff *skb); | |
826 | ||
827 | #ifdef CONFIG_XFRM | |
828 | extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type); | |
829 | extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); | |
830 | extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); | |
831 | #else | |
832 | static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) | |
833 | { | |
834 | return -ENOPROTOOPT; | |
835 | } | |
836 | ||
837 | static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) | |
838 | { | |
839 | /* should not happen */ | |
840 | kfree_skb(skb); | |
841 | return 0; | |
842 | } | |
843 | static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) | |
844 | { | |
845 | return -EINVAL; | |
846 | } | |
847 | #endif | |
848 | ||
849 | struct xfrm_policy *xfrm_policy_alloc(int gfp); | |
850 | extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *); | |
851 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); | |
852 | struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel, | |
853 | int delete); | |
854 | struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete); | |
855 | void xfrm_policy_flush(void); | |
856 | u32 xfrm_get_acqseq(void); | |
857 | void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); | |
858 | struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, | |
859 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
860 | int create, unsigned short family); | |
861 | extern void xfrm_policy_flush(void); | |
862 | extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); | |
863 | extern int xfrm_flush_bundles(void); | |
864 | extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family); | |
865 | extern void xfrm_init_pmtu(struct dst_entry *dst); | |
866 | ||
867 | extern wait_queue_head_t km_waitq; | |
868 | extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); | |
869 | extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard); | |
870 | ||
871 | extern void xfrm_input_init(void); | |
872 | extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq); | |
873 | ||
874 | extern void xfrm_probe_algs(void); | |
875 | extern int xfrm_count_auth_supported(void); | |
876 | extern int xfrm_count_enc_supported(void); | |
877 | extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); | |
878 | extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); | |
879 | extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); | |
880 | extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); | |
881 | extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); | |
882 | extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); | |
883 | extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); | |
884 | extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); | |
885 | ||
886 | struct crypto_tfm; | |
887 | typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int); | |
888 | ||
889 | extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm, | |
890 | int offset, int len, icv_update_fn_t icv_update); | |
891 | ||
892 | static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, | |
893 | int family) | |
894 | { | |
895 | switch (family) { | |
896 | default: | |
897 | case AF_INET: | |
898 | return a->a4 - b->a4; | |
899 | case AF_INET6: | |
900 | return ipv6_addr_cmp((struct in6_addr *)a, | |
901 | (struct in6_addr *)b); | |
902 | } | |
903 | } | |
904 | ||
905 | #endif /* _NET_XFRM_H */ |