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1da177e4 LT |
1 | #ifndef _NET_XFRM_H |
2 | #define _NET_XFRM_H | |
3 | ||
aabc9761 | 4 | #include <linux/compiler.h> |
1da177e4 LT |
5 | #include <linux/xfrm.h> |
6 | #include <linux/spinlock.h> | |
7 | #include <linux/list.h> | |
8 | #include <linux/skbuff.h> | |
9 | #include <linux/netdevice.h> | |
10 | #include <linux/crypto.h> | |
11 | #include <linux/pfkeyv2.h> | |
12 | #include <linux/in6.h> | |
13 | ||
14 | #include <net/sock.h> | |
15 | #include <net/dst.h> | |
16 | #include <net/route.h> | |
17 | #include <net/ipv6.h> | |
18 | #include <net/ip6_fib.h> | |
19 | ||
20 | #define XFRM_ALIGN8(len) (((len) + 7) & ~7) | |
21 | ||
22 | extern struct semaphore xfrm_cfg_sem; | |
23 | ||
24 | /* Organization of SPD aka "XFRM rules" | |
25 | ------------------------------------ | |
26 | ||
27 | Basic objects: | |
28 | - policy rule, struct xfrm_policy (=SPD entry) | |
29 | - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) | |
30 | - instance of a transformer, struct xfrm_state (=SA) | |
31 | - template to clone xfrm_state, struct xfrm_tmpl | |
32 | ||
33 | SPD is plain linear list of xfrm_policy rules, ordered by priority. | |
34 | (To be compatible with existing pfkeyv2 implementations, | |
35 | many rules with priority of 0x7fffffff are allowed to exist and | |
36 | such rules are ordered in an unpredictable way, thanks to bsd folks.) | |
37 | ||
38 | Lookup is plain linear search until the first match with selector. | |
39 | ||
40 | If "action" is "block", then we prohibit the flow, otherwise: | |
41 | if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, | |
42 | policy entry has list of up to XFRM_MAX_DEPTH transformations, | |
43 | described by templates xfrm_tmpl. Each template is resolved | |
44 | to a complete xfrm_state (see below) and we pack bundle of transformations | |
45 | to a dst_entry returned to requestor. | |
46 | ||
47 | dst -. xfrm .-> xfrm_state #1 | |
48 | |---. child .-> dst -. xfrm .-> xfrm_state #2 | |
49 | |---. child .-> dst -. xfrm .-> xfrm_state #3 | |
50 | |---. child .-> NULL | |
51 | ||
52 | Bundles are cached at xrfm_policy struct (field ->bundles). | |
53 | ||
54 | ||
55 | Resolution of xrfm_tmpl | |
56 | ----------------------- | |
57 | Template contains: | |
58 | 1. ->mode Mode: transport or tunnel | |
59 | 2. ->id.proto Protocol: AH/ESP/IPCOMP | |
60 | 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. | |
61 | Q: allow to resolve security gateway? | |
62 | 4. ->id.spi If not zero, static SPI. | |
63 | 5. ->saddr Local tunnel endpoint, ignored for transport mode. | |
64 | 6. ->algos List of allowed algos. Plain bitmask now. | |
65 | Q: ealgos, aalgos, calgos. What a mess... | |
66 | 7. ->share Sharing mode. | |
67 | Q: how to implement private sharing mode? To add struct sock* to | |
68 | flow id? | |
69 | ||
70 | Having this template we search through SAD searching for entries | |
71 | with appropriate mode/proto/algo, permitted by selector. | |
72 | If no appropriate entry found, it is requested from key manager. | |
73 | ||
74 | PROBLEMS: | |
75 | Q: How to find all the bundles referring to a physical path for | |
76 | PMTU discovery? Seems, dst should contain list of all parents... | |
77 | and enter to infinite locking hierarchy disaster. | |
78 | No! It is easier, we will not search for them, let them find us. | |
79 | We add genid to each dst plus pointer to genid of raw IP route, | |
80 | pmtu disc will update pmtu on raw IP route and increase its genid. | |
81 | dst_check() will see this for top level and trigger resyncing | |
82 | metrics. Plus, it will be made via sk->sk_dst_cache. Solved. | |
83 | */ | |
84 | ||
85 | /* Full description of state of transformer. */ | |
86 | struct xfrm_state | |
87 | { | |
88 | /* Note: bydst is re-used during gc */ | |
89 | struct list_head bydst; | |
90 | struct list_head byspi; | |
91 | ||
92 | atomic_t refcnt; | |
93 | spinlock_t lock; | |
94 | ||
95 | struct xfrm_id id; | |
96 | struct xfrm_selector sel; | |
97 | ||
98 | /* Key manger bits */ | |
99 | struct { | |
100 | u8 state; | |
101 | u8 dying; | |
102 | u32 seq; | |
103 | } km; | |
104 | ||
105 | /* Parameters of this state. */ | |
106 | struct { | |
107 | u32 reqid; | |
108 | u8 mode; | |
109 | u8 replay_window; | |
110 | u8 aalgo, ealgo, calgo; | |
111 | u8 flags; | |
112 | u16 family; | |
113 | xfrm_address_t saddr; | |
114 | int header_len; | |
115 | int trailer_len; | |
116 | } props; | |
117 | ||
118 | struct xfrm_lifetime_cfg lft; | |
119 | ||
120 | /* Data for transformer */ | |
121 | struct xfrm_algo *aalg; | |
122 | struct xfrm_algo *ealg; | |
123 | struct xfrm_algo *calg; | |
124 | ||
125 | /* Data for encapsulator */ | |
126 | struct xfrm_encap_tmpl *encap; | |
127 | ||
128 | /* IPComp needs an IPIP tunnel for handling uncompressed packets */ | |
129 | struct xfrm_state *tunnel; | |
130 | ||
131 | /* If a tunnel, number of users + 1 */ | |
132 | atomic_t tunnel_users; | |
133 | ||
134 | /* State for replay detection */ | |
135 | struct xfrm_replay_state replay; | |
136 | ||
137 | /* Statistics */ | |
138 | struct xfrm_stats stats; | |
139 | ||
140 | struct xfrm_lifetime_cur curlft; | |
141 | struct timer_list timer; | |
142 | ||
143 | /* Reference to data common to all the instances of this | |
144 | * transformer. */ | |
145 | struct xfrm_type *type; | |
146 | ||
df71837d TJ |
147 | /* Security context */ |
148 | struct xfrm_sec_ctx *security; | |
149 | ||
1da177e4 LT |
150 | /* Private data of this transformer, format is opaque, |
151 | * interpreted by xfrm_type methods. */ | |
152 | void *data; | |
153 | }; | |
154 | ||
155 | enum { | |
156 | XFRM_STATE_VOID, | |
157 | XFRM_STATE_ACQ, | |
158 | XFRM_STATE_VALID, | |
159 | XFRM_STATE_ERROR, | |
160 | XFRM_STATE_EXPIRED, | |
161 | XFRM_STATE_DEAD | |
162 | }; | |
163 | ||
26b15dad JHS |
164 | /* callback structure passed from either netlink or pfkey */ |
165 | struct km_event | |
166 | { | |
bf08867f HX |
167 | union { |
168 | u32 hard; | |
169 | u32 proto; | |
170 | u32 byid; | |
171 | } data; | |
172 | ||
26b15dad JHS |
173 | u32 seq; |
174 | u32 pid; | |
175 | u32 event; | |
176 | }; | |
177 | ||
1da177e4 LT |
178 | struct xfrm_type; |
179 | struct xfrm_dst; | |
180 | struct xfrm_policy_afinfo { | |
181 | unsigned short family; | |
182 | rwlock_t lock; | |
183 | struct xfrm_type_map *type_map; | |
184 | struct dst_ops *dst_ops; | |
185 | void (*garbage_collect)(void); | |
186 | int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); | |
187 | struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); | |
188 | int (*bundle_create)(struct xfrm_policy *policy, | |
189 | struct xfrm_state **xfrm, | |
190 | int nx, | |
191 | struct flowi *fl, | |
192 | struct dst_entry **dst_p); | |
193 | void (*decode_session)(struct sk_buff *skb, | |
194 | struct flowi *fl); | |
195 | }; | |
196 | ||
197 | extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); | |
198 | extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); | |
26b15dad JHS |
199 | extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); |
200 | extern void km_state_notify(struct xfrm_state *x, struct km_event *c); | |
1da177e4 LT |
201 | |
202 | #define XFRM_ACQ_EXPIRES 30 | |
203 | ||
204 | struct xfrm_tmpl; | |
205 | struct xfrm_state_afinfo { | |
206 | unsigned short family; | |
207 | rwlock_t lock; | |
208 | struct list_head *state_bydst; | |
209 | struct list_head *state_byspi; | |
d094cd83 | 210 | int (*init_flags)(struct xfrm_state *x); |
1da177e4 LT |
211 | void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, |
212 | struct xfrm_tmpl *tmpl, | |
213 | xfrm_address_t *daddr, xfrm_address_t *saddr); | |
214 | struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto); | |
215 | struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto, | |
216 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
217 | int create); | |
218 | }; | |
219 | ||
220 | extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); | |
221 | extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); | |
222 | ||
223 | extern void xfrm_state_delete_tunnel(struct xfrm_state *x); | |
224 | ||
225 | struct xfrm_decap_state; | |
226 | struct xfrm_type | |
227 | { | |
228 | char *description; | |
229 | struct module *owner; | |
230 | __u8 proto; | |
231 | ||
72cb6962 | 232 | int (*init_state)(struct xfrm_state *x); |
1da177e4 LT |
233 | void (*destructor)(struct xfrm_state *); |
234 | int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb); | |
235 | int (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb); | |
236 | int (*output)(struct xfrm_state *, struct sk_buff *pskb); | |
237 | /* Estimate maximal size of result of transformation of a dgram */ | |
238 | u32 (*get_max_size)(struct xfrm_state *, int size); | |
239 | }; | |
240 | ||
241 | struct xfrm_type_map { | |
242 | rwlock_t lock; | |
243 | struct xfrm_type *map[256]; | |
244 | }; | |
245 | ||
246 | extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); | |
247 | extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); | |
248 | extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); | |
249 | extern void xfrm_put_type(struct xfrm_type *type); | |
250 | ||
251 | struct xfrm_tmpl | |
252 | { | |
253 | /* id in template is interpreted as: | |
254 | * daddr - destination of tunnel, may be zero for transport mode. | |
255 | * spi - zero to acquire spi. Not zero if spi is static, then | |
256 | * daddr must be fixed too. | |
257 | * proto - AH/ESP/IPCOMP | |
258 | */ | |
259 | struct xfrm_id id; | |
260 | ||
261 | /* Source address of tunnel. Ignored, if it is not a tunnel. */ | |
262 | xfrm_address_t saddr; | |
263 | ||
264 | __u32 reqid; | |
265 | ||
266 | /* Mode: transport/tunnel */ | |
267 | __u8 mode; | |
268 | ||
269 | /* Sharing mode: unique, this session only, this user only etc. */ | |
270 | __u8 share; | |
271 | ||
272 | /* May skip this transfomration if no SA is found */ | |
273 | __u8 optional; | |
274 | ||
275 | /* Bit mask of algos allowed for acquisition */ | |
276 | __u32 aalgos; | |
277 | __u32 ealgos; | |
278 | __u32 calgos; | |
279 | }; | |
280 | ||
281 | #define XFRM_MAX_DEPTH 4 | |
282 | ||
283 | struct xfrm_policy | |
284 | { | |
285 | struct xfrm_policy *next; | |
286 | struct list_head list; | |
287 | ||
288 | /* This lock only affects elements except for entry. */ | |
289 | rwlock_t lock; | |
290 | atomic_t refcnt; | |
291 | struct timer_list timer; | |
292 | ||
293 | u32 priority; | |
294 | u32 index; | |
295 | struct xfrm_selector selector; | |
296 | struct xfrm_lifetime_cfg lft; | |
297 | struct xfrm_lifetime_cur curlft; | |
298 | struct dst_entry *bundles; | |
299 | __u16 family; | |
300 | __u8 action; | |
301 | __u8 flags; | |
302 | __u8 dead; | |
303 | __u8 xfrm_nr; | |
df71837d | 304 | struct xfrm_sec_ctx *security; |
1da177e4 LT |
305 | struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; |
306 | }; | |
307 | ||
308 | #define XFRM_KM_TIMEOUT 30 | |
309 | ||
310 | struct xfrm_mgr | |
311 | { | |
312 | struct list_head list; | |
313 | char *id; | |
26b15dad | 314 | int (*notify)(struct xfrm_state *x, struct km_event *c); |
1da177e4 LT |
315 | int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); |
316 | struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir); | |
317 | int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); | |
26b15dad | 318 | int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); |
1da177e4 LT |
319 | }; |
320 | ||
321 | extern int xfrm_register_km(struct xfrm_mgr *km); | |
322 | extern int xfrm_unregister_km(struct xfrm_mgr *km); | |
323 | ||
324 | ||
325 | extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2]; | |
326 | ||
327 | static inline void xfrm_pol_hold(struct xfrm_policy *policy) | |
328 | { | |
329 | if (likely(policy != NULL)) | |
330 | atomic_inc(&policy->refcnt); | |
331 | } | |
332 | ||
333 | extern void __xfrm_policy_destroy(struct xfrm_policy *policy); | |
334 | ||
335 | static inline void xfrm_pol_put(struct xfrm_policy *policy) | |
336 | { | |
337 | if (atomic_dec_and_test(&policy->refcnt)) | |
338 | __xfrm_policy_destroy(policy); | |
339 | } | |
340 | ||
341 | #define XFRM_DST_HSIZE 1024 | |
342 | ||
343 | static __inline__ | |
344 | unsigned __xfrm4_dst_hash(xfrm_address_t *addr) | |
345 | { | |
346 | unsigned h; | |
347 | h = ntohl(addr->a4); | |
348 | h = (h ^ (h>>16)) % XFRM_DST_HSIZE; | |
349 | return h; | |
350 | } | |
351 | ||
352 | static __inline__ | |
353 | unsigned __xfrm6_dst_hash(xfrm_address_t *addr) | |
354 | { | |
355 | unsigned h; | |
356 | h = ntohl(addr->a6[2]^addr->a6[3]); | |
357 | h = (h ^ (h>>16)) % XFRM_DST_HSIZE; | |
358 | return h; | |
359 | } | |
360 | ||
361 | static __inline__ | |
362 | unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family) | |
363 | { | |
364 | switch (family) { | |
365 | case AF_INET: | |
366 | return __xfrm4_dst_hash(addr); | |
367 | case AF_INET6: | |
368 | return __xfrm6_dst_hash(addr); | |
369 | } | |
370 | return 0; | |
371 | } | |
372 | ||
373 | static __inline__ | |
374 | unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) | |
375 | { | |
376 | unsigned h; | |
377 | h = ntohl(addr->a4^spi^proto); | |
378 | h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; | |
379 | return h; | |
380 | } | |
381 | ||
382 | static __inline__ | |
383 | unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) | |
384 | { | |
385 | unsigned h; | |
386 | h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto); | |
387 | h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; | |
388 | return h; | |
389 | } | |
390 | ||
391 | static __inline__ | |
392 | unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family) | |
393 | { | |
394 | switch (family) { | |
395 | case AF_INET: | |
396 | return __xfrm4_spi_hash(addr, spi, proto); | |
397 | case AF_INET6: | |
398 | return __xfrm6_spi_hash(addr, spi, proto); | |
399 | } | |
400 | return 0; /*XXX*/ | |
401 | } | |
402 | ||
403 | extern void __xfrm_state_destroy(struct xfrm_state *); | |
404 | ||
405 | static inline void xfrm_state_put(struct xfrm_state *x) | |
406 | { | |
407 | if (atomic_dec_and_test(&x->refcnt)) | |
408 | __xfrm_state_destroy(x); | |
409 | } | |
410 | ||
411 | static inline void xfrm_state_hold(struct xfrm_state *x) | |
412 | { | |
413 | atomic_inc(&x->refcnt); | |
414 | } | |
415 | ||
416 | static __inline__ int addr_match(void *token1, void *token2, int prefixlen) | |
417 | { | |
418 | __u32 *a1 = token1; | |
419 | __u32 *a2 = token2; | |
420 | int pdw; | |
421 | int pbi; | |
422 | ||
423 | pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ | |
424 | pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ | |
425 | ||
426 | if (pdw) | |
427 | if (memcmp(a1, a2, pdw << 2)) | |
428 | return 0; | |
429 | ||
430 | if (pbi) { | |
431 | __u32 mask; | |
432 | ||
433 | mask = htonl((0xffffffff) << (32 - pbi)); | |
434 | ||
435 | if ((a1[pdw] ^ a2[pdw]) & mask) | |
436 | return 0; | |
437 | } | |
438 | ||
439 | return 1; | |
440 | } | |
441 | ||
442 | static __inline__ | |
443 | u16 xfrm_flowi_sport(struct flowi *fl) | |
444 | { | |
445 | u16 port; | |
446 | switch(fl->proto) { | |
447 | case IPPROTO_TCP: | |
448 | case IPPROTO_UDP: | |
449 | case IPPROTO_SCTP: | |
450 | port = fl->fl_ip_sport; | |
451 | break; | |
452 | case IPPROTO_ICMP: | |
453 | case IPPROTO_ICMPV6: | |
454 | port = htons(fl->fl_icmp_type); | |
455 | break; | |
456 | default: | |
457 | port = 0; /*XXX*/ | |
458 | } | |
459 | return port; | |
460 | } | |
461 | ||
462 | static __inline__ | |
463 | u16 xfrm_flowi_dport(struct flowi *fl) | |
464 | { | |
465 | u16 port; | |
466 | switch(fl->proto) { | |
467 | case IPPROTO_TCP: | |
468 | case IPPROTO_UDP: | |
469 | case IPPROTO_SCTP: | |
470 | port = fl->fl_ip_dport; | |
471 | break; | |
472 | case IPPROTO_ICMP: | |
473 | case IPPROTO_ICMPV6: | |
474 | port = htons(fl->fl_icmp_code); | |
475 | break; | |
476 | default: | |
477 | port = 0; /*XXX*/ | |
478 | } | |
479 | return port; | |
480 | } | |
481 | ||
482 | static inline int | |
483 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
484 | { | |
485 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
486 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
487 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
488 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
489 | (fl->proto == sel->proto || !sel->proto) && | |
490 | (fl->oif == sel->ifindex || !sel->ifindex); | |
491 | } | |
492 | ||
493 | static inline int | |
494 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
495 | { | |
496 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
497 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
498 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
499 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
500 | (fl->proto == sel->proto || !sel->proto) && | |
501 | (fl->oif == sel->ifindex || !sel->ifindex); | |
502 | } | |
503 | ||
504 | static inline int | |
505 | xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
506 | unsigned short family) | |
507 | { | |
508 | switch (family) { | |
509 | case AF_INET: | |
510 | return __xfrm4_selector_match(sel, fl); | |
511 | case AF_INET6: | |
512 | return __xfrm6_selector_match(sel, fl); | |
513 | } | |
514 | return 0; | |
515 | } | |
516 | ||
df71837d TJ |
517 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
518 | /* If neither has a context --> match | |
519 | * Otherwise, both must have a context and the sids, doi, alg must match | |
520 | */ | |
521 | static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) | |
522 | { | |
523 | return ((!s1 && !s2) || | |
524 | (s1 && s2 && | |
525 | (s1->ctx_sid == s2->ctx_sid) && | |
526 | (s1->ctx_doi == s2->ctx_doi) && | |
527 | (s1->ctx_alg == s2->ctx_alg))); | |
528 | } | |
529 | #else | |
530 | static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) | |
531 | { | |
532 | return 1; | |
533 | } | |
534 | #endif | |
535 | ||
1da177e4 LT |
536 | /* A struct encoding bundle of transformations to apply to some set of flow. |
537 | * | |
538 | * dst->child points to the next element of bundle. | |
539 | * dst->xfrm points to an instanse of transformer. | |
540 | * | |
541 | * Due to unfortunate limitations of current routing cache, which we | |
542 | * have no time to fix, it mirrors struct rtable and bound to the same | |
543 | * routing key, including saddr,daddr. However, we can have many of | |
544 | * bundles differing by session id. All the bundles grow from a parent | |
545 | * policy rule. | |
546 | */ | |
547 | struct xfrm_dst | |
548 | { | |
549 | union { | |
550 | struct xfrm_dst *next; | |
551 | struct dst_entry dst; | |
552 | struct rtable rt; | |
553 | struct rt6_info rt6; | |
554 | } u; | |
555 | struct dst_entry *route; | |
556 | u32 route_mtu_cached; | |
557 | u32 child_mtu_cached; | |
92d63dec HY |
558 | u32 route_cookie; |
559 | u32 path_cookie; | |
1da177e4 LT |
560 | }; |
561 | ||
aabc9761 HX |
562 | static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) |
563 | { | |
564 | dst_release(xdst->route); | |
565 | if (likely(xdst->u.dst.xfrm)) | |
566 | xfrm_state_put(xdst->u.dst.xfrm); | |
567 | } | |
568 | ||
569 | extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); | |
570 | ||
1da177e4 LT |
571 | /* Decapsulation state, used by the input to store data during |
572 | * decapsulation procedure, to be used later (during the policy | |
573 | * check | |
574 | */ | |
575 | struct xfrm_decap_state { | |
576 | char decap_data[20]; | |
577 | __u16 decap_type; | |
578 | }; | |
579 | ||
580 | struct sec_decap_state { | |
581 | struct xfrm_state *xvec; | |
582 | struct xfrm_decap_state decap; | |
583 | }; | |
584 | ||
585 | struct sec_path | |
586 | { | |
587 | atomic_t refcnt; | |
588 | int len; | |
589 | struct sec_decap_state x[XFRM_MAX_DEPTH]; | |
590 | }; | |
591 | ||
592 | static inline struct sec_path * | |
593 | secpath_get(struct sec_path *sp) | |
594 | { | |
595 | if (sp) | |
596 | atomic_inc(&sp->refcnt); | |
597 | return sp; | |
598 | } | |
599 | ||
600 | extern void __secpath_destroy(struct sec_path *sp); | |
601 | ||
602 | static inline void | |
603 | secpath_put(struct sec_path *sp) | |
604 | { | |
605 | if (sp && atomic_dec_and_test(&sp->refcnt)) | |
606 | __secpath_destroy(sp); | |
607 | } | |
608 | ||
609 | extern struct sec_path *secpath_dup(struct sec_path *src); | |
610 | ||
611 | static inline void | |
612 | secpath_reset(struct sk_buff *skb) | |
613 | { | |
614 | #ifdef CONFIG_XFRM | |
615 | secpath_put(skb->sp); | |
616 | skb->sp = NULL; | |
617 | #endif | |
618 | } | |
619 | ||
620 | static inline int | |
621 | __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) | |
622 | { | |
623 | return (tmpl->saddr.a4 && | |
624 | tmpl->saddr.a4 != x->props.saddr.a4); | |
625 | } | |
626 | ||
627 | static inline int | |
628 | __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) | |
629 | { | |
630 | return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && | |
631 | ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); | |
632 | } | |
633 | ||
634 | static inline int | |
635 | xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) | |
636 | { | |
637 | switch (family) { | |
638 | case AF_INET: | |
639 | return __xfrm4_state_addr_cmp(tmpl, x); | |
640 | case AF_INET6: | |
641 | return __xfrm6_state_addr_cmp(tmpl, x); | |
642 | } | |
643 | return !0; | |
644 | } | |
645 | ||
646 | #ifdef CONFIG_XFRM | |
647 | ||
648 | extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); | |
649 | ||
650 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) | |
651 | { | |
652 | if (sk && sk->sk_policy[XFRM_POLICY_IN]) | |
653 | return __xfrm_policy_check(sk, dir, skb, family); | |
654 | ||
655 | return (!xfrm_policy_list[dir] && !skb->sp) || | |
656 | (skb->dst->flags & DST_NOPOLICY) || | |
657 | __xfrm_policy_check(sk, dir, skb, family); | |
658 | } | |
659 | ||
660 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
661 | { | |
662 | return xfrm_policy_check(sk, dir, skb, AF_INET); | |
663 | } | |
664 | ||
665 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
666 | { | |
667 | return xfrm_policy_check(sk, dir, skb, AF_INET6); | |
668 | } | |
669 | ||
670 | ||
671 | extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); | |
672 | ||
673 | static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
674 | { | |
675 | return !xfrm_policy_list[XFRM_POLICY_OUT] || | |
676 | (skb->dst->flags & DST_NOXFRM) || | |
677 | __xfrm_route_forward(skb, family); | |
678 | } | |
679 | ||
680 | static inline int xfrm4_route_forward(struct sk_buff *skb) | |
681 | { | |
682 | return xfrm_route_forward(skb, AF_INET); | |
683 | } | |
684 | ||
685 | static inline int xfrm6_route_forward(struct sk_buff *skb) | |
686 | { | |
687 | return xfrm_route_forward(skb, AF_INET6); | |
688 | } | |
689 | ||
690 | extern int __xfrm_sk_clone_policy(struct sock *sk); | |
691 | ||
692 | static inline int xfrm_sk_clone_policy(struct sock *sk) | |
693 | { | |
694 | if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) | |
695 | return __xfrm_sk_clone_policy(sk); | |
696 | return 0; | |
697 | } | |
698 | ||
4666faab | 699 | extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); |
1da177e4 LT |
700 | |
701 | static inline void xfrm_sk_free_policy(struct sock *sk) | |
702 | { | |
703 | if (unlikely(sk->sk_policy[0] != NULL)) { | |
704 | xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); | |
705 | sk->sk_policy[0] = NULL; | |
706 | } | |
707 | if (unlikely(sk->sk_policy[1] != NULL)) { | |
708 | xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); | |
709 | sk->sk_policy[1] = NULL; | |
710 | } | |
711 | } | |
712 | ||
713 | #else | |
714 | ||
715 | static inline void xfrm_sk_free_policy(struct sock *sk) {} | |
716 | static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } | |
717 | static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } | |
718 | static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } | |
719 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
720 | { | |
721 | return 1; | |
722 | } | |
723 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
724 | { | |
725 | return 1; | |
726 | } | |
727 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) | |
728 | { | |
729 | return 1; | |
730 | } | |
731 | #endif | |
732 | ||
733 | static __inline__ | |
734 | xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) | |
735 | { | |
736 | switch (family){ | |
737 | case AF_INET: | |
738 | return (xfrm_address_t *)&fl->fl4_dst; | |
739 | case AF_INET6: | |
740 | return (xfrm_address_t *)&fl->fl6_dst; | |
741 | } | |
742 | return NULL; | |
743 | } | |
744 | ||
745 | static __inline__ | |
746 | xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) | |
747 | { | |
748 | switch (family){ | |
749 | case AF_INET: | |
750 | return (xfrm_address_t *)&fl->fl4_src; | |
751 | case AF_INET6: | |
752 | return (xfrm_address_t *)&fl->fl6_src; | |
753 | } | |
754 | return NULL; | |
755 | } | |
756 | ||
757 | static __inline__ int | |
758 | __xfrm4_state_addr_check(struct xfrm_state *x, | |
759 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
760 | { | |
761 | if (daddr->a4 == x->id.daddr.a4 && | |
762 | (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) | |
763 | return 1; | |
764 | return 0; | |
765 | } | |
766 | ||
767 | static __inline__ int | |
768 | __xfrm6_state_addr_check(struct xfrm_state *x, | |
769 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
770 | { | |
771 | if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && | |
772 | (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| | |
773 | ipv6_addr_any((struct in6_addr *)saddr) || | |
774 | ipv6_addr_any((struct in6_addr *)&x->props.saddr))) | |
775 | return 1; | |
776 | return 0; | |
777 | } | |
778 | ||
779 | static __inline__ int | |
780 | xfrm_state_addr_check(struct xfrm_state *x, | |
781 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
782 | unsigned short family) | |
783 | { | |
784 | switch (family) { | |
785 | case AF_INET: | |
786 | return __xfrm4_state_addr_check(x, daddr, saddr); | |
787 | case AF_INET6: | |
788 | return __xfrm6_state_addr_check(x, daddr, saddr); | |
789 | } | |
790 | return 0; | |
791 | } | |
792 | ||
793 | static inline int xfrm_state_kern(struct xfrm_state *x) | |
794 | { | |
795 | return atomic_read(&x->tunnel_users); | |
796 | } | |
797 | ||
798 | /* | |
799 | * xfrm algorithm information | |
800 | */ | |
801 | struct xfrm_algo_auth_info { | |
802 | u16 icv_truncbits; | |
803 | u16 icv_fullbits; | |
804 | }; | |
805 | ||
806 | struct xfrm_algo_encr_info { | |
807 | u16 blockbits; | |
808 | u16 defkeybits; | |
809 | }; | |
810 | ||
811 | struct xfrm_algo_comp_info { | |
812 | u16 threshold; | |
813 | }; | |
814 | ||
815 | struct xfrm_algo_desc { | |
816 | char *name; | |
817 | u8 available:1; | |
818 | union { | |
819 | struct xfrm_algo_auth_info auth; | |
820 | struct xfrm_algo_encr_info encr; | |
821 | struct xfrm_algo_comp_info comp; | |
822 | } uinfo; | |
823 | struct sadb_alg desc; | |
824 | }; | |
825 | ||
826 | /* XFRM tunnel handlers. */ | |
827 | struct xfrm_tunnel { | |
828 | int (*handler)(struct sk_buff *skb); | |
0303770d | 829 | void (*err_handler)(struct sk_buff *skb, __u32 info); |
1da177e4 LT |
830 | }; |
831 | ||
832 | struct xfrm6_tunnel { | |
833 | int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp); | |
834 | void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
835 | int type, int code, int offset, __u32 info); | |
836 | }; | |
837 | ||
838 | extern void xfrm_init(void); | |
839 | extern void xfrm4_init(void); | |
840 | extern void xfrm6_init(void); | |
841 | extern void xfrm6_fini(void); | |
842 | extern void xfrm_state_init(void); | |
843 | extern void xfrm4_state_init(void); | |
1da177e4 LT |
844 | extern void xfrm6_state_init(void); |
845 | extern void xfrm6_state_fini(void); | |
846 | ||
847 | extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); | |
848 | extern struct xfrm_state *xfrm_state_alloc(void); | |
849 | extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
850 | struct flowi *fl, struct xfrm_tmpl *tmpl, | |
851 | struct xfrm_policy *pol, int *err, | |
852 | unsigned short family); | |
853 | extern int xfrm_state_check_expire(struct xfrm_state *x); | |
854 | extern void xfrm_state_insert(struct xfrm_state *x); | |
855 | extern int xfrm_state_add(struct xfrm_state *x); | |
856 | extern int xfrm_state_update(struct xfrm_state *x); | |
857 | extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family); | |
858 | extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); | |
26b15dad | 859 | extern int xfrm_state_delete(struct xfrm_state *x); |
1da177e4 LT |
860 | extern void xfrm_state_flush(u8 proto); |
861 | extern int xfrm_replay_check(struct xfrm_state *x, u32 seq); | |
862 | extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq); | |
863 | extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); | |
864 | extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); | |
72cb6962 | 865 | extern int xfrm_init_state(struct xfrm_state *x); |
1da177e4 LT |
866 | extern int xfrm4_rcv(struct sk_buff *skb); |
867 | extern int xfrm4_output(struct sk_buff *skb); | |
868 | extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler); | |
869 | extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler); | |
870 | extern int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi); | |
871 | extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp); | |
872 | extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler); | |
873 | extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler); | |
874 | extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); | |
875 | extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); | |
876 | extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); | |
877 | extern int xfrm6_output(struct sk_buff *skb); | |
878 | ||
879 | #ifdef CONFIG_XFRM | |
880 | extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type); | |
881 | extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); | |
882 | extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); | |
883 | #else | |
884 | static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) | |
885 | { | |
886 | return -ENOPROTOOPT; | |
887 | } | |
888 | ||
889 | static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) | |
890 | { | |
891 | /* should not happen */ | |
892 | kfree_skb(skb); | |
893 | return 0; | |
894 | } | |
895 | static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) | |
896 | { | |
897 | return -EINVAL; | |
898 | } | |
899 | #endif | |
900 | ||
dd0fc66f | 901 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); |
1da177e4 LT |
902 | extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *); |
903 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); | |
df71837d TJ |
904 | struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel, |
905 | struct xfrm_sec_ctx *ctx, int delete); | |
1da177e4 LT |
906 | struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete); |
907 | void xfrm_policy_flush(void); | |
908 | u32 xfrm_get_acqseq(void); | |
909 | void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); | |
910 | struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, | |
911 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
912 | int create, unsigned short family); | |
913 | extern void xfrm_policy_flush(void); | |
914 | extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); | |
915 | extern int xfrm_flush_bundles(void); | |
399c180a | 916 | extern void xfrm_flush_all_bundles(void); |
1da177e4 LT |
917 | extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family); |
918 | extern void xfrm_init_pmtu(struct dst_entry *dst); | |
919 | ||
920 | extern wait_queue_head_t km_waitq; | |
921 | extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); | |
922 | extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard); | |
923 | ||
924 | extern void xfrm_input_init(void); | |
925 | extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq); | |
926 | ||
927 | extern void xfrm_probe_algs(void); | |
928 | extern int xfrm_count_auth_supported(void); | |
929 | extern int xfrm_count_enc_supported(void); | |
930 | extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); | |
931 | extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); | |
932 | extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); | |
933 | extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); | |
934 | extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); | |
935 | extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); | |
936 | extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); | |
937 | extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); | |
938 | ||
939 | struct crypto_tfm; | |
940 | typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int); | |
941 | ||
942 | extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm, | |
943 | int offset, int len, icv_update_fn_t icv_update); | |
944 | ||
945 | static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, | |
946 | int family) | |
947 | { | |
948 | switch (family) { | |
949 | default: | |
950 | case AF_INET: | |
951 | return a->a4 - b->a4; | |
952 | case AF_INET6: | |
953 | return ipv6_addr_cmp((struct in6_addr *)a, | |
954 | (struct in6_addr *)b); | |
955 | } | |
956 | } | |
957 | ||
77d8d7a6 HX |
958 | static inline int xfrm_policy_id2dir(u32 index) |
959 | { | |
960 | return index & 7; | |
961 | } | |
962 | ||
1da177e4 | 963 | #endif /* _NET_XFRM_H */ |