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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 LT |
11 | #include <linux/crypto.h> |
12 | #include <linux/pfkeyv2.h> | |
13 | #include <linux/in6.h> | |
14 | ||
15 | #include <net/sock.h> | |
16 | #include <net/dst.h> | |
17 | #include <net/route.h> | |
18 | #include <net/ipv6.h> | |
19 | #include <net/ip6_fib.h> | |
20 | ||
21 | #define XFRM_ALIGN8(len) (((len) + 7) & ~7) | |
22 | ||
f8cd5488 JHS |
23 | extern struct sock *xfrm_nl; |
24 | extern u32 sysctl_xfrm_aevent_etime; | |
25 | extern u32 sysctl_xfrm_aevent_rseqth; | |
26 | ||
1da177e4 LT |
27 | extern struct semaphore xfrm_cfg_sem; |
28 | ||
29 | /* Organization of SPD aka "XFRM rules" | |
30 | ------------------------------------ | |
31 | ||
32 | Basic objects: | |
33 | - policy rule, struct xfrm_policy (=SPD entry) | |
34 | - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) | |
35 | - instance of a transformer, struct xfrm_state (=SA) | |
36 | - template to clone xfrm_state, struct xfrm_tmpl | |
37 | ||
38 | SPD is plain linear list of xfrm_policy rules, ordered by priority. | |
39 | (To be compatible with existing pfkeyv2 implementations, | |
40 | many rules with priority of 0x7fffffff are allowed to exist and | |
41 | such rules are ordered in an unpredictable way, thanks to bsd folks.) | |
42 | ||
43 | Lookup is plain linear search until the first match with selector. | |
44 | ||
45 | If "action" is "block", then we prohibit the flow, otherwise: | |
46 | if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, | |
47 | policy entry has list of up to XFRM_MAX_DEPTH transformations, | |
48 | described by templates xfrm_tmpl. Each template is resolved | |
49 | to a complete xfrm_state (see below) and we pack bundle of transformations | |
50 | to a dst_entry returned to requestor. | |
51 | ||
52 | dst -. xfrm .-> xfrm_state #1 | |
53 | |---. child .-> dst -. xfrm .-> xfrm_state #2 | |
54 | |---. child .-> dst -. xfrm .-> xfrm_state #3 | |
55 | |---. child .-> NULL | |
56 | ||
57 | Bundles are cached at xrfm_policy struct (field ->bundles). | |
58 | ||
59 | ||
60 | Resolution of xrfm_tmpl | |
61 | ----------------------- | |
62 | Template contains: | |
63 | 1. ->mode Mode: transport or tunnel | |
64 | 2. ->id.proto Protocol: AH/ESP/IPCOMP | |
65 | 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. | |
66 | Q: allow to resolve security gateway? | |
67 | 4. ->id.spi If not zero, static SPI. | |
68 | 5. ->saddr Local tunnel endpoint, ignored for transport mode. | |
69 | 6. ->algos List of allowed algos. Plain bitmask now. | |
70 | Q: ealgos, aalgos, calgos. What a mess... | |
71 | 7. ->share Sharing mode. | |
72 | Q: how to implement private sharing mode? To add struct sock* to | |
73 | flow id? | |
74 | ||
75 | Having this template we search through SAD searching for entries | |
76 | with appropriate mode/proto/algo, permitted by selector. | |
77 | If no appropriate entry found, it is requested from key manager. | |
78 | ||
79 | PROBLEMS: | |
80 | Q: How to find all the bundles referring to a physical path for | |
81 | PMTU discovery? Seems, dst should contain list of all parents... | |
82 | and enter to infinite locking hierarchy disaster. | |
83 | No! It is easier, we will not search for them, let them find us. | |
84 | We add genid to each dst plus pointer to genid of raw IP route, | |
85 | pmtu disc will update pmtu on raw IP route and increase its genid. | |
86 | dst_check() will see this for top level and trigger resyncing | |
87 | metrics. Plus, it will be made via sk->sk_dst_cache. Solved. | |
88 | */ | |
89 | ||
90 | /* Full description of state of transformer. */ | |
91 | struct xfrm_state | |
92 | { | |
93 | /* Note: bydst is re-used during gc */ | |
94 | struct list_head bydst; | |
95 | struct list_head byspi; | |
96 | ||
97 | atomic_t refcnt; | |
98 | spinlock_t lock; | |
99 | ||
100 | struct xfrm_id id; | |
101 | struct xfrm_selector sel; | |
102 | ||
103 | /* Key manger bits */ | |
104 | struct { | |
105 | u8 state; | |
106 | u8 dying; | |
107 | u32 seq; | |
108 | } km; | |
109 | ||
110 | /* Parameters of this state. */ | |
111 | struct { | |
112 | u32 reqid; | |
113 | u8 mode; | |
114 | u8 replay_window; | |
115 | u8 aalgo, ealgo, calgo; | |
116 | u8 flags; | |
117 | u16 family; | |
118 | xfrm_address_t saddr; | |
119 | int header_len; | |
120 | int trailer_len; | |
121 | } props; | |
122 | ||
123 | struct xfrm_lifetime_cfg lft; | |
124 | ||
125 | /* Data for transformer */ | |
126 | struct xfrm_algo *aalg; | |
127 | struct xfrm_algo *ealg; | |
128 | struct xfrm_algo *calg; | |
129 | ||
130 | /* Data for encapsulator */ | |
131 | struct xfrm_encap_tmpl *encap; | |
132 | ||
133 | /* IPComp needs an IPIP tunnel for handling uncompressed packets */ | |
134 | struct xfrm_state *tunnel; | |
135 | ||
136 | /* If a tunnel, number of users + 1 */ | |
137 | atomic_t tunnel_users; | |
138 | ||
139 | /* State for replay detection */ | |
140 | struct xfrm_replay_state replay; | |
141 | ||
f8cd5488 JHS |
142 | /* Replay detection state at the time we sent the last notification */ |
143 | struct xfrm_replay_state preplay; | |
144 | ||
145 | /* Replay detection notification settings */ | |
146 | u32 replay_maxage; | |
147 | u32 replay_maxdiff; | |
148 | ||
149 | /* Replay detection notification timer */ | |
150 | struct timer_list rtimer; | |
151 | ||
1da177e4 LT |
152 | /* Statistics */ |
153 | struct xfrm_stats stats; | |
154 | ||
155 | struct xfrm_lifetime_cur curlft; | |
156 | struct timer_list timer; | |
157 | ||
158 | /* Reference to data common to all the instances of this | |
159 | * transformer. */ | |
160 | struct xfrm_type *type; | |
161 | ||
df71837d TJ |
162 | /* Security context */ |
163 | struct xfrm_sec_ctx *security; | |
164 | ||
1da177e4 LT |
165 | /* Private data of this transformer, format is opaque, |
166 | * interpreted by xfrm_type methods. */ | |
167 | void *data; | |
168 | }; | |
169 | ||
170 | enum { | |
171 | XFRM_STATE_VOID, | |
172 | XFRM_STATE_ACQ, | |
173 | XFRM_STATE_VALID, | |
174 | XFRM_STATE_ERROR, | |
175 | XFRM_STATE_EXPIRED, | |
176 | XFRM_STATE_DEAD | |
177 | }; | |
178 | ||
26b15dad JHS |
179 | /* callback structure passed from either netlink or pfkey */ |
180 | struct km_event | |
181 | { | |
bf08867f HX |
182 | union { |
183 | u32 hard; | |
184 | u32 proto; | |
185 | u32 byid; | |
f8cd5488 | 186 | u32 aevent; |
bf08867f HX |
187 | } data; |
188 | ||
26b15dad JHS |
189 | u32 seq; |
190 | u32 pid; | |
191 | u32 event; | |
192 | }; | |
193 | ||
1da177e4 LT |
194 | struct xfrm_type; |
195 | struct xfrm_dst; | |
196 | struct xfrm_policy_afinfo { | |
197 | unsigned short family; | |
198 | rwlock_t lock; | |
199 | struct xfrm_type_map *type_map; | |
200 | struct dst_ops *dst_ops; | |
201 | void (*garbage_collect)(void); | |
202 | int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); | |
203 | struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); | |
204 | int (*bundle_create)(struct xfrm_policy *policy, | |
205 | struct xfrm_state **xfrm, | |
206 | int nx, | |
207 | struct flowi *fl, | |
208 | struct dst_entry **dst_p); | |
209 | void (*decode_session)(struct sk_buff *skb, | |
210 | struct flowi *fl); | |
211 | }; | |
212 | ||
213 | extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); | |
214 | extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); | |
26b15dad JHS |
215 | extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); |
216 | extern void km_state_notify(struct xfrm_state *x, struct km_event *c); | |
1da177e4 LT |
217 | #define XFRM_ACQ_EXPIRES 30 |
218 | ||
219 | struct xfrm_tmpl; | |
980ebd25 | 220 | extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d JHS |
221 | extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
222 | extern int __xfrm_state_delete(struct xfrm_state *x); | |
223 | ||
1da177e4 LT |
224 | struct xfrm_state_afinfo { |
225 | unsigned short family; | |
226 | rwlock_t lock; | |
227 | struct list_head *state_bydst; | |
228 | struct list_head *state_byspi; | |
d094cd83 | 229 | int (*init_flags)(struct xfrm_state *x); |
1da177e4 LT |
230 | void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, |
231 | struct xfrm_tmpl *tmpl, | |
232 | xfrm_address_t *daddr, xfrm_address_t *saddr); | |
233 | struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto); | |
234 | struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto, | |
235 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
236 | int create); | |
237 | }; | |
238 | ||
239 | extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); | |
240 | extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); | |
241 | ||
242 | extern void xfrm_state_delete_tunnel(struct xfrm_state *x); | |
243 | ||
244 | struct xfrm_decap_state; | |
245 | struct xfrm_type | |
246 | { | |
247 | char *description; | |
248 | struct module *owner; | |
249 | __u8 proto; | |
250 | ||
72cb6962 | 251 | int (*init_state)(struct xfrm_state *x); |
1da177e4 LT |
252 | void (*destructor)(struct xfrm_state *); |
253 | int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb); | |
1da177e4 LT |
254 | int (*output)(struct xfrm_state *, struct sk_buff *pskb); |
255 | /* Estimate maximal size of result of transformation of a dgram */ | |
256 | u32 (*get_max_size)(struct xfrm_state *, int size); | |
257 | }; | |
258 | ||
259 | struct xfrm_type_map { | |
260 | rwlock_t lock; | |
261 | struct xfrm_type *map[256]; | |
262 | }; | |
263 | ||
264 | extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); | |
265 | extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); | |
266 | extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); | |
267 | extern void xfrm_put_type(struct xfrm_type *type); | |
268 | ||
269 | struct xfrm_tmpl | |
270 | { | |
271 | /* id in template is interpreted as: | |
272 | * daddr - destination of tunnel, may be zero for transport mode. | |
273 | * spi - zero to acquire spi. Not zero if spi is static, then | |
274 | * daddr must be fixed too. | |
275 | * proto - AH/ESP/IPCOMP | |
276 | */ | |
277 | struct xfrm_id id; | |
278 | ||
279 | /* Source address of tunnel. Ignored, if it is not a tunnel. */ | |
280 | xfrm_address_t saddr; | |
281 | ||
282 | __u32 reqid; | |
283 | ||
284 | /* Mode: transport/tunnel */ | |
285 | __u8 mode; | |
286 | ||
287 | /* Sharing mode: unique, this session only, this user only etc. */ | |
288 | __u8 share; | |
289 | ||
290 | /* May skip this transfomration if no SA is found */ | |
291 | __u8 optional; | |
292 | ||
293 | /* Bit mask of algos allowed for acquisition */ | |
294 | __u32 aalgos; | |
295 | __u32 ealgos; | |
296 | __u32 calgos; | |
297 | }; | |
298 | ||
299 | #define XFRM_MAX_DEPTH 4 | |
300 | ||
301 | struct xfrm_policy | |
302 | { | |
303 | struct xfrm_policy *next; | |
304 | struct list_head list; | |
305 | ||
306 | /* This lock only affects elements except for entry. */ | |
307 | rwlock_t lock; | |
308 | atomic_t refcnt; | |
309 | struct timer_list timer; | |
310 | ||
311 | u32 priority; | |
312 | u32 index; | |
313 | struct xfrm_selector selector; | |
314 | struct xfrm_lifetime_cfg lft; | |
315 | struct xfrm_lifetime_cur curlft; | |
316 | struct dst_entry *bundles; | |
317 | __u16 family; | |
318 | __u8 action; | |
319 | __u8 flags; | |
320 | __u8 dead; | |
321 | __u8 xfrm_nr; | |
df71837d | 322 | struct xfrm_sec_ctx *security; |
1da177e4 LT |
323 | struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; |
324 | }; | |
325 | ||
f8cd5488 JHS |
326 | #define XFRM_KM_TIMEOUT 30 |
327 | /* which seqno */ | |
328 | #define XFRM_REPLAY_SEQ 1 | |
329 | #define XFRM_REPLAY_OSEQ 2 | |
330 | #define XFRM_REPLAY_SEQ_MASK 3 | |
331 | /* what happened */ | |
332 | #define XFRM_REPLAY_UPDATE XFRM_AE_CR | |
333 | #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE | |
334 | ||
335 | /* default aevent timeout in units of 100ms */ | |
336 | #define XFRM_AE_ETIME 10 | |
337 | /* Async Event timer multiplier */ | |
338 | #define XFRM_AE_ETH_M 10 | |
339 | /* default seq threshold size */ | |
340 | #define XFRM_AE_SEQT_SIZE 2 | |
1da177e4 LT |
341 | |
342 | struct xfrm_mgr | |
343 | { | |
344 | struct list_head list; | |
345 | char *id; | |
26b15dad | 346 | int (*notify)(struct xfrm_state *x, struct km_event *c); |
1da177e4 LT |
347 | int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); |
348 | struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir); | |
349 | int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); | |
26b15dad | 350 | int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); |
1da177e4 LT |
351 | }; |
352 | ||
353 | extern int xfrm_register_km(struct xfrm_mgr *km); | |
354 | extern int xfrm_unregister_km(struct xfrm_mgr *km); | |
355 | ||
356 | ||
357 | extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2]; | |
358 | ||
359 | static inline void xfrm_pol_hold(struct xfrm_policy *policy) | |
360 | { | |
361 | if (likely(policy != NULL)) | |
362 | atomic_inc(&policy->refcnt); | |
363 | } | |
364 | ||
365 | extern void __xfrm_policy_destroy(struct xfrm_policy *policy); | |
366 | ||
367 | static inline void xfrm_pol_put(struct xfrm_policy *policy) | |
368 | { | |
369 | if (atomic_dec_and_test(&policy->refcnt)) | |
370 | __xfrm_policy_destroy(policy); | |
371 | } | |
372 | ||
373 | #define XFRM_DST_HSIZE 1024 | |
374 | ||
375 | static __inline__ | |
376 | unsigned __xfrm4_dst_hash(xfrm_address_t *addr) | |
377 | { | |
378 | unsigned h; | |
379 | h = ntohl(addr->a4); | |
380 | h = (h ^ (h>>16)) % XFRM_DST_HSIZE; | |
381 | return h; | |
382 | } | |
383 | ||
384 | static __inline__ | |
385 | unsigned __xfrm6_dst_hash(xfrm_address_t *addr) | |
386 | { | |
387 | unsigned h; | |
388 | h = ntohl(addr->a6[2]^addr->a6[3]); | |
389 | h = (h ^ (h>>16)) % XFRM_DST_HSIZE; | |
390 | return h; | |
391 | } | |
392 | ||
393 | static __inline__ | |
394 | unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family) | |
395 | { | |
396 | switch (family) { | |
397 | case AF_INET: | |
398 | return __xfrm4_dst_hash(addr); | |
399 | case AF_INET6: | |
400 | return __xfrm6_dst_hash(addr); | |
401 | } | |
402 | return 0; | |
403 | } | |
404 | ||
405 | static __inline__ | |
406 | unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) | |
407 | { | |
408 | unsigned h; | |
409 | h = ntohl(addr->a4^spi^proto); | |
410 | h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; | |
411 | return h; | |
412 | } | |
413 | ||
414 | static __inline__ | |
415 | unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) | |
416 | { | |
417 | unsigned h; | |
418 | h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto); | |
419 | h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; | |
420 | return h; | |
421 | } | |
422 | ||
423 | static __inline__ | |
424 | unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family) | |
425 | { | |
426 | switch (family) { | |
427 | case AF_INET: | |
428 | return __xfrm4_spi_hash(addr, spi, proto); | |
429 | case AF_INET6: | |
430 | return __xfrm6_spi_hash(addr, spi, proto); | |
431 | } | |
432 | return 0; /*XXX*/ | |
433 | } | |
434 | ||
435 | extern void __xfrm_state_destroy(struct xfrm_state *); | |
436 | ||
21380b81 HX |
437 | static inline void __xfrm_state_put(struct xfrm_state *x) |
438 | { | |
439 | atomic_dec(&x->refcnt); | |
440 | } | |
441 | ||
1da177e4 LT |
442 | static inline void xfrm_state_put(struct xfrm_state *x) |
443 | { | |
444 | if (atomic_dec_and_test(&x->refcnt)) | |
445 | __xfrm_state_destroy(x); | |
446 | } | |
447 | ||
448 | static inline void xfrm_state_hold(struct xfrm_state *x) | |
449 | { | |
450 | atomic_inc(&x->refcnt); | |
451 | } | |
452 | ||
453 | static __inline__ int addr_match(void *token1, void *token2, int prefixlen) | |
454 | { | |
455 | __u32 *a1 = token1; | |
456 | __u32 *a2 = token2; | |
457 | int pdw; | |
458 | int pbi; | |
459 | ||
460 | pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ | |
461 | pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ | |
462 | ||
463 | if (pdw) | |
464 | if (memcmp(a1, a2, pdw << 2)) | |
465 | return 0; | |
466 | ||
467 | if (pbi) { | |
468 | __u32 mask; | |
469 | ||
470 | mask = htonl((0xffffffff) << (32 - pbi)); | |
471 | ||
472 | if ((a1[pdw] ^ a2[pdw]) & mask) | |
473 | return 0; | |
474 | } | |
475 | ||
476 | return 1; | |
477 | } | |
478 | ||
479 | static __inline__ | |
480 | u16 xfrm_flowi_sport(struct flowi *fl) | |
481 | { | |
482 | u16 port; | |
483 | switch(fl->proto) { | |
484 | case IPPROTO_TCP: | |
485 | case IPPROTO_UDP: | |
486 | case IPPROTO_SCTP: | |
487 | port = fl->fl_ip_sport; | |
488 | break; | |
489 | case IPPROTO_ICMP: | |
490 | case IPPROTO_ICMPV6: | |
491 | port = htons(fl->fl_icmp_type); | |
492 | break; | |
493 | default: | |
494 | port = 0; /*XXX*/ | |
495 | } | |
496 | return port; | |
497 | } | |
498 | ||
499 | static __inline__ | |
500 | u16 xfrm_flowi_dport(struct flowi *fl) | |
501 | { | |
502 | u16 port; | |
503 | switch(fl->proto) { | |
504 | case IPPROTO_TCP: | |
505 | case IPPROTO_UDP: | |
506 | case IPPROTO_SCTP: | |
507 | port = fl->fl_ip_dport; | |
508 | break; | |
509 | case IPPROTO_ICMP: | |
510 | case IPPROTO_ICMPV6: | |
511 | port = htons(fl->fl_icmp_code); | |
512 | break; | |
513 | default: | |
514 | port = 0; /*XXX*/ | |
515 | } | |
516 | return port; | |
517 | } | |
518 | ||
519 | static inline int | |
520 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
521 | { | |
522 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
523 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
524 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
525 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
526 | (fl->proto == sel->proto || !sel->proto) && | |
527 | (fl->oif == sel->ifindex || !sel->ifindex); | |
528 | } | |
529 | ||
530 | static inline int | |
531 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
532 | { | |
533 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
534 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
535 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
536 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
537 | (fl->proto == sel->proto || !sel->proto) && | |
538 | (fl->oif == sel->ifindex || !sel->ifindex); | |
539 | } | |
540 | ||
541 | static inline int | |
542 | xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
543 | unsigned short family) | |
544 | { | |
545 | switch (family) { | |
546 | case AF_INET: | |
547 | return __xfrm4_selector_match(sel, fl); | |
548 | case AF_INET6: | |
549 | return __xfrm6_selector_match(sel, fl); | |
550 | } | |
551 | return 0; | |
552 | } | |
553 | ||
df71837d TJ |
554 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
555 | /* If neither has a context --> match | |
556 | * Otherwise, both must have a context and the sids, doi, alg must match | |
557 | */ | |
558 | static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) | |
559 | { | |
560 | return ((!s1 && !s2) || | |
561 | (s1 && s2 && | |
562 | (s1->ctx_sid == s2->ctx_sid) && | |
563 | (s1->ctx_doi == s2->ctx_doi) && | |
564 | (s1->ctx_alg == s2->ctx_alg))); | |
565 | } | |
566 | #else | |
567 | static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) | |
568 | { | |
569 | return 1; | |
570 | } | |
571 | #endif | |
572 | ||
1da177e4 LT |
573 | /* A struct encoding bundle of transformations to apply to some set of flow. |
574 | * | |
575 | * dst->child points to the next element of bundle. | |
576 | * dst->xfrm points to an instanse of transformer. | |
577 | * | |
578 | * Due to unfortunate limitations of current routing cache, which we | |
579 | * have no time to fix, it mirrors struct rtable and bound to the same | |
580 | * routing key, including saddr,daddr. However, we can have many of | |
581 | * bundles differing by session id. All the bundles grow from a parent | |
582 | * policy rule. | |
583 | */ | |
584 | struct xfrm_dst | |
585 | { | |
586 | union { | |
587 | struct xfrm_dst *next; | |
588 | struct dst_entry dst; | |
589 | struct rtable rt; | |
590 | struct rt6_info rt6; | |
591 | } u; | |
592 | struct dst_entry *route; | |
593 | u32 route_mtu_cached; | |
594 | u32 child_mtu_cached; | |
92d63dec HY |
595 | u32 route_cookie; |
596 | u32 path_cookie; | |
1da177e4 LT |
597 | }; |
598 | ||
aabc9761 HX |
599 | static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) |
600 | { | |
601 | dst_release(xdst->route); | |
602 | if (likely(xdst->u.dst.xfrm)) | |
603 | xfrm_state_put(xdst->u.dst.xfrm); | |
604 | } | |
605 | ||
606 | extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); | |
607 | ||
1da177e4 LT |
608 | /* Decapsulation state, used by the input to store data during |
609 | * decapsulation procedure, to be used later (during the policy | |
610 | * check | |
611 | */ | |
612 | struct xfrm_decap_state { | |
613 | char decap_data[20]; | |
614 | __u16 decap_type; | |
615 | }; | |
616 | ||
617 | struct sec_decap_state { | |
618 | struct xfrm_state *xvec; | |
619 | struct xfrm_decap_state decap; | |
620 | }; | |
621 | ||
622 | struct sec_path | |
623 | { | |
624 | atomic_t refcnt; | |
625 | int len; | |
626 | struct sec_decap_state x[XFRM_MAX_DEPTH]; | |
627 | }; | |
628 | ||
629 | static inline struct sec_path * | |
630 | secpath_get(struct sec_path *sp) | |
631 | { | |
632 | if (sp) | |
633 | atomic_inc(&sp->refcnt); | |
634 | return sp; | |
635 | } | |
636 | ||
637 | extern void __secpath_destroy(struct sec_path *sp); | |
638 | ||
639 | static inline void | |
640 | secpath_put(struct sec_path *sp) | |
641 | { | |
642 | if (sp && atomic_dec_and_test(&sp->refcnt)) | |
643 | __secpath_destroy(sp); | |
644 | } | |
645 | ||
646 | extern struct sec_path *secpath_dup(struct sec_path *src); | |
647 | ||
648 | static inline void | |
649 | secpath_reset(struct sk_buff *skb) | |
650 | { | |
651 | #ifdef CONFIG_XFRM | |
652 | secpath_put(skb->sp); | |
653 | skb->sp = NULL; | |
654 | #endif | |
655 | } | |
656 | ||
657 | static inline int | |
658 | __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) | |
659 | { | |
660 | return (tmpl->saddr.a4 && | |
661 | tmpl->saddr.a4 != x->props.saddr.a4); | |
662 | } | |
663 | ||
664 | static inline int | |
665 | __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) | |
666 | { | |
667 | return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && | |
668 | ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); | |
669 | } | |
670 | ||
671 | static inline int | |
672 | xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) | |
673 | { | |
674 | switch (family) { | |
675 | case AF_INET: | |
676 | return __xfrm4_state_addr_cmp(tmpl, x); | |
677 | case AF_INET6: | |
678 | return __xfrm6_state_addr_cmp(tmpl, x); | |
679 | } | |
680 | return !0; | |
681 | } | |
682 | ||
683 | #ifdef CONFIG_XFRM | |
684 | ||
685 | extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); | |
686 | ||
687 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) | |
688 | { | |
689 | if (sk && sk->sk_policy[XFRM_POLICY_IN]) | |
690 | return __xfrm_policy_check(sk, dir, skb, family); | |
691 | ||
692 | return (!xfrm_policy_list[dir] && !skb->sp) || | |
693 | (skb->dst->flags & DST_NOPOLICY) || | |
694 | __xfrm_policy_check(sk, dir, skb, family); | |
695 | } | |
696 | ||
697 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
698 | { | |
699 | return xfrm_policy_check(sk, dir, skb, AF_INET); | |
700 | } | |
701 | ||
702 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
703 | { | |
704 | return xfrm_policy_check(sk, dir, skb, AF_INET6); | |
705 | } | |
706 | ||
3e3850e9 | 707 | extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); |
1da177e4 LT |
708 | extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); |
709 | ||
710 | static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
711 | { | |
712 | return !xfrm_policy_list[XFRM_POLICY_OUT] || | |
713 | (skb->dst->flags & DST_NOXFRM) || | |
714 | __xfrm_route_forward(skb, family); | |
715 | } | |
716 | ||
717 | static inline int xfrm4_route_forward(struct sk_buff *skb) | |
718 | { | |
719 | return xfrm_route_forward(skb, AF_INET); | |
720 | } | |
721 | ||
722 | static inline int xfrm6_route_forward(struct sk_buff *skb) | |
723 | { | |
724 | return xfrm_route_forward(skb, AF_INET6); | |
725 | } | |
726 | ||
727 | extern int __xfrm_sk_clone_policy(struct sock *sk); | |
728 | ||
729 | static inline int xfrm_sk_clone_policy(struct sock *sk) | |
730 | { | |
731 | if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) | |
732 | return __xfrm_sk_clone_policy(sk); | |
733 | return 0; | |
734 | } | |
735 | ||
4666faab | 736 | extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); |
1da177e4 LT |
737 | |
738 | static inline void xfrm_sk_free_policy(struct sock *sk) | |
739 | { | |
740 | if (unlikely(sk->sk_policy[0] != NULL)) { | |
741 | xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); | |
742 | sk->sk_policy[0] = NULL; | |
743 | } | |
744 | if (unlikely(sk->sk_policy[1] != NULL)) { | |
745 | xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); | |
746 | sk->sk_policy[1] = NULL; | |
747 | } | |
748 | } | |
749 | ||
750 | #else | |
751 | ||
752 | static inline void xfrm_sk_free_policy(struct sock *sk) {} | |
753 | static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } | |
754 | static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } | |
755 | static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } | |
756 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
757 | { | |
758 | return 1; | |
759 | } | |
760 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
761 | { | |
762 | return 1; | |
763 | } | |
764 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) | |
765 | { | |
766 | return 1; | |
767 | } | |
768 | #endif | |
769 | ||
770 | static __inline__ | |
771 | xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) | |
772 | { | |
773 | switch (family){ | |
774 | case AF_INET: | |
775 | return (xfrm_address_t *)&fl->fl4_dst; | |
776 | case AF_INET6: | |
777 | return (xfrm_address_t *)&fl->fl6_dst; | |
778 | } | |
779 | return NULL; | |
780 | } | |
781 | ||
782 | static __inline__ | |
783 | xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) | |
784 | { | |
785 | switch (family){ | |
786 | case AF_INET: | |
787 | return (xfrm_address_t *)&fl->fl4_src; | |
788 | case AF_INET6: | |
789 | return (xfrm_address_t *)&fl->fl6_src; | |
790 | } | |
791 | return NULL; | |
792 | } | |
793 | ||
794 | static __inline__ int | |
795 | __xfrm4_state_addr_check(struct xfrm_state *x, | |
796 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
797 | { | |
798 | if (daddr->a4 == x->id.daddr.a4 && | |
799 | (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) | |
800 | return 1; | |
801 | return 0; | |
802 | } | |
803 | ||
804 | static __inline__ int | |
805 | __xfrm6_state_addr_check(struct xfrm_state *x, | |
806 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
807 | { | |
808 | if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && | |
809 | (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| | |
810 | ipv6_addr_any((struct in6_addr *)saddr) || | |
811 | ipv6_addr_any((struct in6_addr *)&x->props.saddr))) | |
812 | return 1; | |
813 | return 0; | |
814 | } | |
815 | ||
816 | static __inline__ int | |
817 | xfrm_state_addr_check(struct xfrm_state *x, | |
818 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
819 | unsigned short family) | |
820 | { | |
821 | switch (family) { | |
822 | case AF_INET: | |
823 | return __xfrm4_state_addr_check(x, daddr, saddr); | |
824 | case AF_INET6: | |
825 | return __xfrm6_state_addr_check(x, daddr, saddr); | |
826 | } | |
827 | return 0; | |
828 | } | |
829 | ||
830 | static inline int xfrm_state_kern(struct xfrm_state *x) | |
831 | { | |
832 | return atomic_read(&x->tunnel_users); | |
833 | } | |
834 | ||
835 | /* | |
836 | * xfrm algorithm information | |
837 | */ | |
838 | struct xfrm_algo_auth_info { | |
839 | u16 icv_truncbits; | |
840 | u16 icv_fullbits; | |
841 | }; | |
842 | ||
843 | struct xfrm_algo_encr_info { | |
844 | u16 blockbits; | |
845 | u16 defkeybits; | |
846 | }; | |
847 | ||
848 | struct xfrm_algo_comp_info { | |
849 | u16 threshold; | |
850 | }; | |
851 | ||
852 | struct xfrm_algo_desc { | |
853 | char *name; | |
854 | u8 available:1; | |
855 | union { | |
856 | struct xfrm_algo_auth_info auth; | |
857 | struct xfrm_algo_encr_info encr; | |
858 | struct xfrm_algo_comp_info comp; | |
859 | } uinfo; | |
860 | struct sadb_alg desc; | |
861 | }; | |
862 | ||
863 | /* XFRM tunnel handlers. */ | |
864 | struct xfrm_tunnel { | |
865 | int (*handler)(struct sk_buff *skb); | |
0303770d | 866 | void (*err_handler)(struct sk_buff *skb, __u32 info); |
1da177e4 LT |
867 | }; |
868 | ||
869 | struct xfrm6_tunnel { | |
951dbc8a | 870 | int (*handler)(struct sk_buff **pskb); |
1da177e4 LT |
871 | void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, |
872 | int type, int code, int offset, __u32 info); | |
873 | }; | |
874 | ||
875 | extern void xfrm_init(void); | |
876 | extern void xfrm4_init(void); | |
877 | extern void xfrm6_init(void); | |
878 | extern void xfrm6_fini(void); | |
879 | extern void xfrm_state_init(void); | |
880 | extern void xfrm4_state_init(void); | |
1da177e4 LT |
881 | extern void xfrm6_state_init(void); |
882 | extern void xfrm6_state_fini(void); | |
883 | ||
884 | extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); | |
885 | extern struct xfrm_state *xfrm_state_alloc(void); | |
886 | extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
887 | struct flowi *fl, struct xfrm_tmpl *tmpl, | |
888 | struct xfrm_policy *pol, int *err, | |
889 | unsigned short family); | |
890 | extern int xfrm_state_check_expire(struct xfrm_state *x); | |
891 | extern void xfrm_state_insert(struct xfrm_state *x); | |
892 | extern int xfrm_state_add(struct xfrm_state *x); | |
893 | extern int xfrm_state_update(struct xfrm_state *x); | |
894 | extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family); | |
895 | extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); | |
26b15dad | 896 | extern int xfrm_state_delete(struct xfrm_state *x); |
1da177e4 LT |
897 | extern void xfrm_state_flush(u8 proto); |
898 | extern int xfrm_replay_check(struct xfrm_state *x, u32 seq); | |
899 | extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq); | |
f8cd5488 | 900 | extern void xfrm_replay_notify(struct xfrm_state *x, int event); |
1da177e4 LT |
901 | extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); |
902 | extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); | |
72cb6962 | 903 | extern int xfrm_init_state(struct xfrm_state *x); |
1da177e4 LT |
904 | extern int xfrm4_rcv(struct sk_buff *skb); |
905 | extern int xfrm4_output(struct sk_buff *skb); | |
906 | extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler); | |
907 | extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler); | |
951dbc8a PM |
908 | extern int xfrm6_rcv_spi(struct sk_buff **pskb, u32 spi); |
909 | extern int xfrm6_rcv(struct sk_buff **pskb); | |
1da177e4 LT |
910 | extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler); |
911 | extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler); | |
912 | extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); | |
913 | extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); | |
914 | extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); | |
915 | extern int xfrm6_output(struct sk_buff *skb); | |
916 | ||
917 | #ifdef CONFIG_XFRM | |
918 | extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type); | |
919 | extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); | |
920 | extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); | |
921 | #else | |
922 | static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) | |
923 | { | |
924 | return -ENOPROTOOPT; | |
925 | } | |
926 | ||
927 | static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) | |
928 | { | |
929 | /* should not happen */ | |
930 | kfree_skb(skb); | |
931 | return 0; | |
932 | } | |
933 | static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) | |
934 | { | |
935 | return -EINVAL; | |
936 | } | |
937 | #endif | |
938 | ||
dd0fc66f | 939 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); |
1da177e4 LT |
940 | extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *); |
941 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); | |
df71837d TJ |
942 | struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel, |
943 | struct xfrm_sec_ctx *ctx, int delete); | |
1da177e4 LT |
944 | struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete); |
945 | void xfrm_policy_flush(void); | |
946 | u32 xfrm_get_acqseq(void); | |
947 | void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); | |
948 | struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, | |
949 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
950 | int create, unsigned short family); | |
951 | extern void xfrm_policy_flush(void); | |
952 | extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); | |
953 | extern int xfrm_flush_bundles(void); | |
399c180a | 954 | extern void xfrm_flush_all_bundles(void); |
1da177e4 LT |
955 | extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family); |
956 | extern void xfrm_init_pmtu(struct dst_entry *dst); | |
957 | ||
958 | extern wait_queue_head_t km_waitq; | |
959 | extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); | |
960 | extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard); | |
961 | ||
962 | extern void xfrm_input_init(void); | |
963 | extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq); | |
964 | ||
965 | extern void xfrm_probe_algs(void); | |
966 | extern int xfrm_count_auth_supported(void); | |
967 | extern int xfrm_count_enc_supported(void); | |
968 | extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); | |
969 | extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); | |
970 | extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); | |
971 | extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); | |
972 | extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); | |
973 | extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); | |
974 | extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); | |
975 | extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); | |
976 | ||
977 | struct crypto_tfm; | |
978 | typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int); | |
979 | ||
980 | extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm, | |
981 | int offset, int len, icv_update_fn_t icv_update); | |
982 | ||
983 | static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, | |
984 | int family) | |
985 | { | |
986 | switch (family) { | |
987 | default: | |
988 | case AF_INET: | |
989 | return a->a4 - b->a4; | |
990 | case AF_INET6: | |
991 | return ipv6_addr_cmp((struct in6_addr *)a, | |
992 | (struct in6_addr *)b); | |
993 | } | |
994 | } | |
995 | ||
77d8d7a6 HX |
996 | static inline int xfrm_policy_id2dir(u32 index) |
997 | { | |
998 | return index & 7; | |
999 | } | |
1000 | ||
f8cd5488 JHS |
1001 | static inline int xfrm_aevent_is_on(void) |
1002 | { | |
1003 | return netlink_has_listeners(xfrm_nl,XFRMNLGRP_AEVENTS); | |
1004 | } | |
1005 | ||
1006 | static inline void xfrm_aevent_doreplay(struct xfrm_state *x) | |
1007 | { | |
1008 | if (xfrm_aevent_is_on()) | |
1009 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); | |
1010 | } | |
1011 | ||
1012 | ||
1da177e4 | 1013 | #endif /* _NET_XFRM_H */ |