Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _NET_XFRM_H |
2 | #define _NET_XFRM_H | |
3 | ||
aabc9761 | 4 | #include <linux/compiler.h> |
14c85021 | 5 | #include <linux/in.h> |
1da177e4 LT |
6 | #include <linux/xfrm.h> |
7 | #include <linux/spinlock.h> | |
8 | #include <linux/list.h> | |
9 | #include <linux/skbuff.h> | |
14c85021 | 10 | #include <linux/socket.h> |
1da177e4 LT |
11 | #include <linux/crypto.h> |
12 | #include <linux/pfkeyv2.h> | |
13 | #include <linux/in6.h> | |
4a3e2f71 | 14 | #include <linux/mutex.h> |
1da177e4 LT |
15 | |
16 | #include <net/sock.h> | |
17 | #include <net/dst.h> | |
18 | #include <net/route.h> | |
19 | #include <net/ipv6.h> | |
20 | #include <net/ip6_fib.h> | |
21 | ||
22 | #define XFRM_ALIGN8(len) (((len) + 7) & ~7) | |
23 | ||
f8cd5488 JHS |
24 | extern struct sock *xfrm_nl; |
25 | extern u32 sysctl_xfrm_aevent_etime; | |
26 | extern u32 sysctl_xfrm_aevent_rseqth; | |
27 | ||
4a3e2f71 | 28 | extern struct mutex xfrm_cfg_mutex; |
1da177e4 LT |
29 | |
30 | /* Organization of SPD aka "XFRM rules" | |
31 | ------------------------------------ | |
32 | ||
33 | Basic objects: | |
34 | - policy rule, struct xfrm_policy (=SPD entry) | |
35 | - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) | |
36 | - instance of a transformer, struct xfrm_state (=SA) | |
37 | - template to clone xfrm_state, struct xfrm_tmpl | |
38 | ||
39 | SPD is plain linear list of xfrm_policy rules, ordered by priority. | |
40 | (To be compatible with existing pfkeyv2 implementations, | |
41 | many rules with priority of 0x7fffffff are allowed to exist and | |
42 | such rules are ordered in an unpredictable way, thanks to bsd folks.) | |
43 | ||
44 | Lookup is plain linear search until the first match with selector. | |
45 | ||
46 | If "action" is "block", then we prohibit the flow, otherwise: | |
47 | if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, | |
48 | policy entry has list of up to XFRM_MAX_DEPTH transformations, | |
49 | described by templates xfrm_tmpl. Each template is resolved | |
50 | to a complete xfrm_state (see below) and we pack bundle of transformations | |
51 | to a dst_entry returned to requestor. | |
52 | ||
53 | dst -. xfrm .-> xfrm_state #1 | |
54 | |---. child .-> dst -. xfrm .-> xfrm_state #2 | |
55 | |---. child .-> dst -. xfrm .-> xfrm_state #3 | |
56 | |---. child .-> NULL | |
57 | ||
58 | Bundles are cached at xrfm_policy struct (field ->bundles). | |
59 | ||
60 | ||
61 | Resolution of xrfm_tmpl | |
62 | ----------------------- | |
63 | Template contains: | |
64 | 1. ->mode Mode: transport or tunnel | |
65 | 2. ->id.proto Protocol: AH/ESP/IPCOMP | |
66 | 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. | |
67 | Q: allow to resolve security gateway? | |
68 | 4. ->id.spi If not zero, static SPI. | |
69 | 5. ->saddr Local tunnel endpoint, ignored for transport mode. | |
70 | 6. ->algos List of allowed algos. Plain bitmask now. | |
71 | Q: ealgos, aalgos, calgos. What a mess... | |
72 | 7. ->share Sharing mode. | |
73 | Q: how to implement private sharing mode? To add struct sock* to | |
74 | flow id? | |
75 | ||
76 | Having this template we search through SAD searching for entries | |
77 | with appropriate mode/proto/algo, permitted by selector. | |
78 | If no appropriate entry found, it is requested from key manager. | |
79 | ||
80 | PROBLEMS: | |
81 | Q: How to find all the bundles referring to a physical path for | |
82 | PMTU discovery? Seems, dst should contain list of all parents... | |
83 | and enter to infinite locking hierarchy disaster. | |
84 | No! It is easier, we will not search for them, let them find us. | |
85 | We add genid to each dst plus pointer to genid of raw IP route, | |
86 | pmtu disc will update pmtu on raw IP route and increase its genid. | |
87 | dst_check() will see this for top level and trigger resyncing | |
88 | metrics. Plus, it will be made via sk->sk_dst_cache. Solved. | |
89 | */ | |
90 | ||
91 | /* Full description of state of transformer. */ | |
92 | struct xfrm_state | |
93 | { | |
94 | /* Note: bydst is re-used during gc */ | |
95 | struct list_head bydst; | |
96 | struct list_head byspi; | |
97 | ||
98 | atomic_t refcnt; | |
99 | spinlock_t lock; | |
100 | ||
101 | struct xfrm_id id; | |
102 | struct xfrm_selector sel; | |
103 | ||
104 | /* Key manger bits */ | |
105 | struct { | |
106 | u8 state; | |
107 | u8 dying; | |
108 | u32 seq; | |
109 | } km; | |
110 | ||
111 | /* Parameters of this state. */ | |
112 | struct { | |
113 | u32 reqid; | |
114 | u8 mode; | |
115 | u8 replay_window; | |
116 | u8 aalgo, ealgo, calgo; | |
117 | u8 flags; | |
118 | u16 family; | |
119 | xfrm_address_t saddr; | |
120 | int header_len; | |
121 | int trailer_len; | |
122 | } props; | |
123 | ||
124 | struct xfrm_lifetime_cfg lft; | |
125 | ||
126 | /* Data for transformer */ | |
127 | struct xfrm_algo *aalg; | |
128 | struct xfrm_algo *ealg; | |
129 | struct xfrm_algo *calg; | |
130 | ||
131 | /* Data for encapsulator */ | |
132 | struct xfrm_encap_tmpl *encap; | |
133 | ||
134 | /* IPComp needs an IPIP tunnel for handling uncompressed packets */ | |
135 | struct xfrm_state *tunnel; | |
136 | ||
137 | /* If a tunnel, number of users + 1 */ | |
138 | atomic_t tunnel_users; | |
139 | ||
140 | /* State for replay detection */ | |
141 | struct xfrm_replay_state replay; | |
142 | ||
f8cd5488 JHS |
143 | /* Replay detection state at the time we sent the last notification */ |
144 | struct xfrm_replay_state preplay; | |
145 | ||
146 | /* Replay detection notification settings */ | |
147 | u32 replay_maxage; | |
148 | u32 replay_maxdiff; | |
149 | ||
150 | /* Replay detection notification timer */ | |
151 | struct timer_list rtimer; | |
152 | ||
1da177e4 LT |
153 | /* Statistics */ |
154 | struct xfrm_stats stats; | |
155 | ||
156 | struct xfrm_lifetime_cur curlft; | |
157 | struct timer_list timer; | |
158 | ||
159 | /* Reference to data common to all the instances of this | |
160 | * transformer. */ | |
161 | struct xfrm_type *type; | |
162 | ||
df71837d TJ |
163 | /* Security context */ |
164 | struct xfrm_sec_ctx *security; | |
165 | ||
1da177e4 LT |
166 | /* Private data of this transformer, format is opaque, |
167 | * interpreted by xfrm_type methods. */ | |
168 | void *data; | |
169 | }; | |
170 | ||
171 | enum { | |
172 | XFRM_STATE_VOID, | |
173 | XFRM_STATE_ACQ, | |
174 | XFRM_STATE_VALID, | |
175 | XFRM_STATE_ERROR, | |
176 | XFRM_STATE_EXPIRED, | |
177 | XFRM_STATE_DEAD | |
178 | }; | |
179 | ||
26b15dad JHS |
180 | /* callback structure passed from either netlink or pfkey */ |
181 | struct km_event | |
182 | { | |
bf08867f HX |
183 | union { |
184 | u32 hard; | |
185 | u32 proto; | |
186 | u32 byid; | |
f8cd5488 | 187 | u32 aevent; |
bf08867f HX |
188 | } data; |
189 | ||
26b15dad JHS |
190 | u32 seq; |
191 | u32 pid; | |
192 | u32 event; | |
193 | }; | |
194 | ||
1da177e4 LT |
195 | struct xfrm_type; |
196 | struct xfrm_dst; | |
197 | struct xfrm_policy_afinfo { | |
198 | unsigned short family; | |
199 | rwlock_t lock; | |
200 | struct xfrm_type_map *type_map; | |
201 | struct dst_ops *dst_ops; | |
202 | void (*garbage_collect)(void); | |
203 | int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl); | |
204 | struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy); | |
205 | int (*bundle_create)(struct xfrm_policy *policy, | |
206 | struct xfrm_state **xfrm, | |
207 | int nx, | |
208 | struct flowi *fl, | |
209 | struct dst_entry **dst_p); | |
210 | void (*decode_session)(struct sk_buff *skb, | |
211 | struct flowi *fl); | |
212 | }; | |
213 | ||
214 | extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo); | |
215 | extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo); | |
26b15dad JHS |
216 | extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c); |
217 | extern void km_state_notify(struct xfrm_state *x, struct km_event *c); | |
1da177e4 LT |
218 | #define XFRM_ACQ_EXPIRES 30 |
219 | ||
220 | struct xfrm_tmpl; | |
980ebd25 | 221 | extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d JHS |
222 | extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
223 | extern int __xfrm_state_delete(struct xfrm_state *x); | |
224 | ||
1da177e4 LT |
225 | struct xfrm_state_afinfo { |
226 | unsigned short family; | |
227 | rwlock_t lock; | |
228 | struct list_head *state_bydst; | |
229 | struct list_head *state_byspi; | |
d094cd83 | 230 | int (*init_flags)(struct xfrm_state *x); |
1da177e4 LT |
231 | void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl, |
232 | struct xfrm_tmpl *tmpl, | |
233 | xfrm_address_t *daddr, xfrm_address_t *saddr); | |
234 | struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto); | |
235 | struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto, | |
236 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
237 | int create); | |
238 | }; | |
239 | ||
240 | extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); | |
241 | extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); | |
242 | ||
243 | extern void xfrm_state_delete_tunnel(struct xfrm_state *x); | |
244 | ||
245 | struct xfrm_decap_state; | |
246 | struct xfrm_type | |
247 | { | |
248 | char *description; | |
249 | struct module *owner; | |
250 | __u8 proto; | |
251 | ||
72cb6962 | 252 | int (*init_state)(struct xfrm_state *x); |
1da177e4 LT |
253 | void (*destructor)(struct xfrm_state *); |
254 | int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb); | |
1da177e4 LT |
255 | int (*output)(struct xfrm_state *, struct sk_buff *pskb); |
256 | /* Estimate maximal size of result of transformation of a dgram */ | |
257 | u32 (*get_max_size)(struct xfrm_state *, int size); | |
258 | }; | |
259 | ||
260 | struct xfrm_type_map { | |
261 | rwlock_t lock; | |
262 | struct xfrm_type *map[256]; | |
263 | }; | |
264 | ||
265 | extern int xfrm_register_type(struct xfrm_type *type, unsigned short family); | |
266 | extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family); | |
267 | extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family); | |
268 | extern void xfrm_put_type(struct xfrm_type *type); | |
269 | ||
270 | struct xfrm_tmpl | |
271 | { | |
272 | /* id in template is interpreted as: | |
273 | * daddr - destination of tunnel, may be zero for transport mode. | |
274 | * spi - zero to acquire spi. Not zero if spi is static, then | |
275 | * daddr must be fixed too. | |
276 | * proto - AH/ESP/IPCOMP | |
277 | */ | |
278 | struct xfrm_id id; | |
279 | ||
280 | /* Source address of tunnel. Ignored, if it is not a tunnel. */ | |
281 | xfrm_address_t saddr; | |
282 | ||
283 | __u32 reqid; | |
284 | ||
285 | /* Mode: transport/tunnel */ | |
286 | __u8 mode; | |
287 | ||
288 | /* Sharing mode: unique, this session only, this user only etc. */ | |
289 | __u8 share; | |
290 | ||
291 | /* May skip this transfomration if no SA is found */ | |
292 | __u8 optional; | |
293 | ||
294 | /* Bit mask of algos allowed for acquisition */ | |
295 | __u32 aalgos; | |
296 | __u32 ealgos; | |
297 | __u32 calgos; | |
298 | }; | |
299 | ||
300 | #define XFRM_MAX_DEPTH 4 | |
301 | ||
302 | struct xfrm_policy | |
303 | { | |
304 | struct xfrm_policy *next; | |
305 | struct list_head list; | |
306 | ||
307 | /* This lock only affects elements except for entry. */ | |
308 | rwlock_t lock; | |
309 | atomic_t refcnt; | |
310 | struct timer_list timer; | |
311 | ||
312 | u32 priority; | |
313 | u32 index; | |
314 | struct xfrm_selector selector; | |
315 | struct xfrm_lifetime_cfg lft; | |
316 | struct xfrm_lifetime_cur curlft; | |
317 | struct dst_entry *bundles; | |
318 | __u16 family; | |
319 | __u8 action; | |
320 | __u8 flags; | |
321 | __u8 dead; | |
322 | __u8 xfrm_nr; | |
df71837d | 323 | struct xfrm_sec_ctx *security; |
1da177e4 LT |
324 | struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; |
325 | }; | |
326 | ||
f8cd5488 JHS |
327 | #define XFRM_KM_TIMEOUT 30 |
328 | /* which seqno */ | |
329 | #define XFRM_REPLAY_SEQ 1 | |
330 | #define XFRM_REPLAY_OSEQ 2 | |
331 | #define XFRM_REPLAY_SEQ_MASK 3 | |
332 | /* what happened */ | |
333 | #define XFRM_REPLAY_UPDATE XFRM_AE_CR | |
334 | #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE | |
335 | ||
336 | /* default aevent timeout in units of 100ms */ | |
337 | #define XFRM_AE_ETIME 10 | |
338 | /* Async Event timer multiplier */ | |
339 | #define XFRM_AE_ETH_M 10 | |
340 | /* default seq threshold size */ | |
341 | #define XFRM_AE_SEQT_SIZE 2 | |
1da177e4 LT |
342 | |
343 | struct xfrm_mgr | |
344 | { | |
345 | struct list_head list; | |
346 | char *id; | |
26b15dad | 347 | int (*notify)(struct xfrm_state *x, struct km_event *c); |
1da177e4 LT |
348 | int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir); |
349 | struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir); | |
350 | int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); | |
26b15dad | 351 | int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c); |
1da177e4 LT |
352 | }; |
353 | ||
354 | extern int xfrm_register_km(struct xfrm_mgr *km); | |
355 | extern int xfrm_unregister_km(struct xfrm_mgr *km); | |
356 | ||
357 | ||
358 | extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2]; | |
359 | ||
360 | static inline void xfrm_pol_hold(struct xfrm_policy *policy) | |
361 | { | |
362 | if (likely(policy != NULL)) | |
363 | atomic_inc(&policy->refcnt); | |
364 | } | |
365 | ||
366 | extern void __xfrm_policy_destroy(struct xfrm_policy *policy); | |
367 | ||
368 | static inline void xfrm_pol_put(struct xfrm_policy *policy) | |
369 | { | |
370 | if (atomic_dec_and_test(&policy->refcnt)) | |
371 | __xfrm_policy_destroy(policy); | |
372 | } | |
373 | ||
374 | #define XFRM_DST_HSIZE 1024 | |
375 | ||
376 | static __inline__ | |
377 | unsigned __xfrm4_dst_hash(xfrm_address_t *addr) | |
378 | { | |
379 | unsigned h; | |
380 | h = ntohl(addr->a4); | |
381 | h = (h ^ (h>>16)) % XFRM_DST_HSIZE; | |
382 | return h; | |
383 | } | |
384 | ||
385 | static __inline__ | |
386 | unsigned __xfrm6_dst_hash(xfrm_address_t *addr) | |
387 | { | |
388 | unsigned h; | |
389 | h = ntohl(addr->a6[2]^addr->a6[3]); | |
390 | h = (h ^ (h>>16)) % XFRM_DST_HSIZE; | |
391 | return h; | |
392 | } | |
393 | ||
394 | static __inline__ | |
395 | unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family) | |
396 | { | |
397 | switch (family) { | |
398 | case AF_INET: | |
399 | return __xfrm4_dst_hash(addr); | |
400 | case AF_INET6: | |
401 | return __xfrm6_dst_hash(addr); | |
402 | } | |
403 | return 0; | |
404 | } | |
405 | ||
406 | static __inline__ | |
407 | unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) | |
408 | { | |
409 | unsigned h; | |
410 | h = ntohl(addr->a4^spi^proto); | |
411 | h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; | |
412 | return h; | |
413 | } | |
414 | ||
415 | static __inline__ | |
416 | unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto) | |
417 | { | |
418 | unsigned h; | |
419 | h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto); | |
420 | h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE; | |
421 | return h; | |
422 | } | |
423 | ||
424 | static __inline__ | |
425 | unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family) | |
426 | { | |
427 | switch (family) { | |
428 | case AF_INET: | |
429 | return __xfrm4_spi_hash(addr, spi, proto); | |
430 | case AF_INET6: | |
431 | return __xfrm6_spi_hash(addr, spi, proto); | |
432 | } | |
433 | return 0; /*XXX*/ | |
434 | } | |
435 | ||
436 | extern void __xfrm_state_destroy(struct xfrm_state *); | |
437 | ||
21380b81 HX |
438 | static inline void __xfrm_state_put(struct xfrm_state *x) |
439 | { | |
440 | atomic_dec(&x->refcnt); | |
441 | } | |
442 | ||
1da177e4 LT |
443 | static inline void xfrm_state_put(struct xfrm_state *x) |
444 | { | |
445 | if (atomic_dec_and_test(&x->refcnt)) | |
446 | __xfrm_state_destroy(x); | |
447 | } | |
448 | ||
449 | static inline void xfrm_state_hold(struct xfrm_state *x) | |
450 | { | |
451 | atomic_inc(&x->refcnt); | |
452 | } | |
453 | ||
454 | static __inline__ int addr_match(void *token1, void *token2, int prefixlen) | |
455 | { | |
456 | __u32 *a1 = token1; | |
457 | __u32 *a2 = token2; | |
458 | int pdw; | |
459 | int pbi; | |
460 | ||
461 | pdw = prefixlen >> 5; /* num of whole __u32 in prefix */ | |
462 | pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ | |
463 | ||
464 | if (pdw) | |
465 | if (memcmp(a1, a2, pdw << 2)) | |
466 | return 0; | |
467 | ||
468 | if (pbi) { | |
469 | __u32 mask; | |
470 | ||
471 | mask = htonl((0xffffffff) << (32 - pbi)); | |
472 | ||
473 | if ((a1[pdw] ^ a2[pdw]) & mask) | |
474 | return 0; | |
475 | } | |
476 | ||
477 | return 1; | |
478 | } | |
479 | ||
480 | static __inline__ | |
481 | u16 xfrm_flowi_sport(struct flowi *fl) | |
482 | { | |
483 | u16 port; | |
484 | switch(fl->proto) { | |
485 | case IPPROTO_TCP: | |
486 | case IPPROTO_UDP: | |
487 | case IPPROTO_SCTP: | |
488 | port = fl->fl_ip_sport; | |
489 | break; | |
490 | case IPPROTO_ICMP: | |
491 | case IPPROTO_ICMPV6: | |
492 | port = htons(fl->fl_icmp_type); | |
493 | break; | |
494 | default: | |
495 | port = 0; /*XXX*/ | |
496 | } | |
497 | return port; | |
498 | } | |
499 | ||
500 | static __inline__ | |
501 | u16 xfrm_flowi_dport(struct flowi *fl) | |
502 | { | |
503 | u16 port; | |
504 | switch(fl->proto) { | |
505 | case IPPROTO_TCP: | |
506 | case IPPROTO_UDP: | |
507 | case IPPROTO_SCTP: | |
508 | port = fl->fl_ip_dport; | |
509 | break; | |
510 | case IPPROTO_ICMP: | |
511 | case IPPROTO_ICMPV6: | |
512 | port = htons(fl->fl_icmp_code); | |
513 | break; | |
514 | default: | |
515 | port = 0; /*XXX*/ | |
516 | } | |
517 | return port; | |
518 | } | |
519 | ||
520 | static inline int | |
521 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
522 | { | |
523 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
524 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
525 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
526 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
527 | (fl->proto == sel->proto || !sel->proto) && | |
528 | (fl->oif == sel->ifindex || !sel->ifindex); | |
529 | } | |
530 | ||
531 | static inline int | |
532 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
533 | { | |
534 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
535 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
536 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
537 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
538 | (fl->proto == sel->proto || !sel->proto) && | |
539 | (fl->oif == sel->ifindex || !sel->ifindex); | |
540 | } | |
541 | ||
542 | static inline int | |
543 | xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
544 | unsigned short family) | |
545 | { | |
546 | switch (family) { | |
547 | case AF_INET: | |
548 | return __xfrm4_selector_match(sel, fl); | |
549 | case AF_INET6: | |
550 | return __xfrm6_selector_match(sel, fl); | |
551 | } | |
552 | return 0; | |
553 | } | |
554 | ||
df71837d TJ |
555 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
556 | /* If neither has a context --> match | |
557 | * Otherwise, both must have a context and the sids, doi, alg must match | |
558 | */ | |
559 | static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) | |
560 | { | |
561 | return ((!s1 && !s2) || | |
562 | (s1 && s2 && | |
563 | (s1->ctx_sid == s2->ctx_sid) && | |
564 | (s1->ctx_doi == s2->ctx_doi) && | |
565 | (s1->ctx_alg == s2->ctx_alg))); | |
566 | } | |
567 | #else | |
568 | static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) | |
569 | { | |
570 | return 1; | |
571 | } | |
572 | #endif | |
573 | ||
1da177e4 LT |
574 | /* A struct encoding bundle of transformations to apply to some set of flow. |
575 | * | |
576 | * dst->child points to the next element of bundle. | |
577 | * dst->xfrm points to an instanse of transformer. | |
578 | * | |
579 | * Due to unfortunate limitations of current routing cache, which we | |
580 | * have no time to fix, it mirrors struct rtable and bound to the same | |
581 | * routing key, including saddr,daddr. However, we can have many of | |
582 | * bundles differing by session id. All the bundles grow from a parent | |
583 | * policy rule. | |
584 | */ | |
585 | struct xfrm_dst | |
586 | { | |
587 | union { | |
588 | struct xfrm_dst *next; | |
589 | struct dst_entry dst; | |
590 | struct rtable rt; | |
591 | struct rt6_info rt6; | |
592 | } u; | |
593 | struct dst_entry *route; | |
594 | u32 route_mtu_cached; | |
595 | u32 child_mtu_cached; | |
92d63dec HY |
596 | u32 route_cookie; |
597 | u32 path_cookie; | |
1da177e4 LT |
598 | }; |
599 | ||
aabc9761 HX |
600 | static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) |
601 | { | |
602 | dst_release(xdst->route); | |
603 | if (likely(xdst->u.dst.xfrm)) | |
604 | xfrm_state_put(xdst->u.dst.xfrm); | |
605 | } | |
606 | ||
607 | extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); | |
608 | ||
1da177e4 LT |
609 | /* Decapsulation state, used by the input to store data during |
610 | * decapsulation procedure, to be used later (during the policy | |
611 | * check | |
612 | */ | |
613 | struct xfrm_decap_state { | |
614 | char decap_data[20]; | |
615 | __u16 decap_type; | |
616 | }; | |
617 | ||
618 | struct sec_decap_state { | |
619 | struct xfrm_state *xvec; | |
620 | struct xfrm_decap_state decap; | |
621 | }; | |
622 | ||
623 | struct sec_path | |
624 | { | |
625 | atomic_t refcnt; | |
626 | int len; | |
627 | struct sec_decap_state x[XFRM_MAX_DEPTH]; | |
628 | }; | |
629 | ||
630 | static inline struct sec_path * | |
631 | secpath_get(struct sec_path *sp) | |
632 | { | |
633 | if (sp) | |
634 | atomic_inc(&sp->refcnt); | |
635 | return sp; | |
636 | } | |
637 | ||
638 | extern void __secpath_destroy(struct sec_path *sp); | |
639 | ||
640 | static inline void | |
641 | secpath_put(struct sec_path *sp) | |
642 | { | |
643 | if (sp && atomic_dec_and_test(&sp->refcnt)) | |
644 | __secpath_destroy(sp); | |
645 | } | |
646 | ||
647 | extern struct sec_path *secpath_dup(struct sec_path *src); | |
648 | ||
649 | static inline void | |
650 | secpath_reset(struct sk_buff *skb) | |
651 | { | |
652 | #ifdef CONFIG_XFRM | |
653 | secpath_put(skb->sp); | |
654 | skb->sp = NULL; | |
655 | #endif | |
656 | } | |
657 | ||
658 | static inline int | |
659 | __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) | |
660 | { | |
661 | return (tmpl->saddr.a4 && | |
662 | tmpl->saddr.a4 != x->props.saddr.a4); | |
663 | } | |
664 | ||
665 | static inline int | |
666 | __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x) | |
667 | { | |
668 | return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && | |
669 | ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); | |
670 | } | |
671 | ||
672 | static inline int | |
673 | xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family) | |
674 | { | |
675 | switch (family) { | |
676 | case AF_INET: | |
677 | return __xfrm4_state_addr_cmp(tmpl, x); | |
678 | case AF_INET6: | |
679 | return __xfrm6_state_addr_cmp(tmpl, x); | |
680 | } | |
681 | return !0; | |
682 | } | |
683 | ||
684 | #ifdef CONFIG_XFRM | |
685 | ||
686 | extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family); | |
687 | ||
688 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) | |
689 | { | |
690 | if (sk && sk->sk_policy[XFRM_POLICY_IN]) | |
691 | return __xfrm_policy_check(sk, dir, skb, family); | |
692 | ||
693 | return (!xfrm_policy_list[dir] && !skb->sp) || | |
694 | (skb->dst->flags & DST_NOPOLICY) || | |
695 | __xfrm_policy_check(sk, dir, skb, family); | |
696 | } | |
697 | ||
698 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
699 | { | |
700 | return xfrm_policy_check(sk, dir, skb, AF_INET); | |
701 | } | |
702 | ||
703 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
704 | { | |
705 | return xfrm_policy_check(sk, dir, skb, AF_INET6); | |
706 | } | |
707 | ||
3e3850e9 | 708 | extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family); |
1da177e4 LT |
709 | extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); |
710 | ||
711 | static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
712 | { | |
713 | return !xfrm_policy_list[XFRM_POLICY_OUT] || | |
714 | (skb->dst->flags & DST_NOXFRM) || | |
715 | __xfrm_route_forward(skb, family); | |
716 | } | |
717 | ||
718 | static inline int xfrm4_route_forward(struct sk_buff *skb) | |
719 | { | |
720 | return xfrm_route_forward(skb, AF_INET); | |
721 | } | |
722 | ||
723 | static inline int xfrm6_route_forward(struct sk_buff *skb) | |
724 | { | |
725 | return xfrm_route_forward(skb, AF_INET6); | |
726 | } | |
727 | ||
728 | extern int __xfrm_sk_clone_policy(struct sock *sk); | |
729 | ||
730 | static inline int xfrm_sk_clone_policy(struct sock *sk) | |
731 | { | |
732 | if (unlikely(sk->sk_policy[0] || sk->sk_policy[1])) | |
733 | return __xfrm_sk_clone_policy(sk); | |
734 | return 0; | |
735 | } | |
736 | ||
4666faab | 737 | extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir); |
1da177e4 LT |
738 | |
739 | static inline void xfrm_sk_free_policy(struct sock *sk) | |
740 | { | |
741 | if (unlikely(sk->sk_policy[0] != NULL)) { | |
742 | xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX); | |
743 | sk->sk_policy[0] = NULL; | |
744 | } | |
745 | if (unlikely(sk->sk_policy[1] != NULL)) { | |
746 | xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1); | |
747 | sk->sk_policy[1] = NULL; | |
748 | } | |
749 | } | |
750 | ||
751 | #else | |
752 | ||
753 | static inline void xfrm_sk_free_policy(struct sock *sk) {} | |
754 | static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; } | |
755 | static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } | |
756 | static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } | |
757 | static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
758 | { | |
759 | return 1; | |
760 | } | |
761 | static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) | |
762 | { | |
763 | return 1; | |
764 | } | |
765 | static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) | |
766 | { | |
767 | return 1; | |
768 | } | |
769 | #endif | |
770 | ||
771 | static __inline__ | |
772 | xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family) | |
773 | { | |
774 | switch (family){ | |
775 | case AF_INET: | |
776 | return (xfrm_address_t *)&fl->fl4_dst; | |
777 | case AF_INET6: | |
778 | return (xfrm_address_t *)&fl->fl6_dst; | |
779 | } | |
780 | return NULL; | |
781 | } | |
782 | ||
783 | static __inline__ | |
784 | xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family) | |
785 | { | |
786 | switch (family){ | |
787 | case AF_INET: | |
788 | return (xfrm_address_t *)&fl->fl4_src; | |
789 | case AF_INET6: | |
790 | return (xfrm_address_t *)&fl->fl6_src; | |
791 | } | |
792 | return NULL; | |
793 | } | |
794 | ||
795 | static __inline__ int | |
796 | __xfrm4_state_addr_check(struct xfrm_state *x, | |
797 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
798 | { | |
799 | if (daddr->a4 == x->id.daddr.a4 && | |
800 | (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) | |
801 | return 1; | |
802 | return 0; | |
803 | } | |
804 | ||
805 | static __inline__ int | |
806 | __xfrm6_state_addr_check(struct xfrm_state *x, | |
807 | xfrm_address_t *daddr, xfrm_address_t *saddr) | |
808 | { | |
809 | if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && | |
810 | (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)|| | |
811 | ipv6_addr_any((struct in6_addr *)saddr) || | |
812 | ipv6_addr_any((struct in6_addr *)&x->props.saddr))) | |
813 | return 1; | |
814 | return 0; | |
815 | } | |
816 | ||
817 | static __inline__ int | |
818 | xfrm_state_addr_check(struct xfrm_state *x, | |
819 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
820 | unsigned short family) | |
821 | { | |
822 | switch (family) { | |
823 | case AF_INET: | |
824 | return __xfrm4_state_addr_check(x, daddr, saddr); | |
825 | case AF_INET6: | |
826 | return __xfrm6_state_addr_check(x, daddr, saddr); | |
827 | } | |
828 | return 0; | |
829 | } | |
830 | ||
831 | static inline int xfrm_state_kern(struct xfrm_state *x) | |
832 | { | |
833 | return atomic_read(&x->tunnel_users); | |
834 | } | |
835 | ||
836 | /* | |
837 | * xfrm algorithm information | |
838 | */ | |
839 | struct xfrm_algo_auth_info { | |
840 | u16 icv_truncbits; | |
841 | u16 icv_fullbits; | |
842 | }; | |
843 | ||
844 | struct xfrm_algo_encr_info { | |
845 | u16 blockbits; | |
846 | u16 defkeybits; | |
847 | }; | |
848 | ||
849 | struct xfrm_algo_comp_info { | |
850 | u16 threshold; | |
851 | }; | |
852 | ||
853 | struct xfrm_algo_desc { | |
854 | char *name; | |
855 | u8 available:1; | |
856 | union { | |
857 | struct xfrm_algo_auth_info auth; | |
858 | struct xfrm_algo_encr_info encr; | |
859 | struct xfrm_algo_comp_info comp; | |
860 | } uinfo; | |
861 | struct sadb_alg desc; | |
862 | }; | |
863 | ||
864 | /* XFRM tunnel handlers. */ | |
865 | struct xfrm_tunnel { | |
866 | int (*handler)(struct sk_buff *skb); | |
0303770d | 867 | void (*err_handler)(struct sk_buff *skb, __u32 info); |
1da177e4 LT |
868 | }; |
869 | ||
870 | struct xfrm6_tunnel { | |
951dbc8a | 871 | int (*handler)(struct sk_buff **pskb); |
1da177e4 LT |
872 | void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, |
873 | int type, int code, int offset, __u32 info); | |
874 | }; | |
875 | ||
876 | extern void xfrm_init(void); | |
877 | extern void xfrm4_init(void); | |
878 | extern void xfrm6_init(void); | |
879 | extern void xfrm6_fini(void); | |
880 | extern void xfrm_state_init(void); | |
881 | extern void xfrm4_state_init(void); | |
1da177e4 LT |
882 | extern void xfrm6_state_init(void); |
883 | extern void xfrm6_state_fini(void); | |
884 | ||
885 | extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *); | |
886 | extern struct xfrm_state *xfrm_state_alloc(void); | |
887 | extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
888 | struct flowi *fl, struct xfrm_tmpl *tmpl, | |
889 | struct xfrm_policy *pol, int *err, | |
890 | unsigned short family); | |
891 | extern int xfrm_state_check_expire(struct xfrm_state *x); | |
892 | extern void xfrm_state_insert(struct xfrm_state *x); | |
893 | extern int xfrm_state_add(struct xfrm_state *x); | |
894 | extern int xfrm_state_update(struct xfrm_state *x); | |
895 | extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family); | |
896 | extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq); | |
26b15dad | 897 | extern int xfrm_state_delete(struct xfrm_state *x); |
1da177e4 LT |
898 | extern void xfrm_state_flush(u8 proto); |
899 | extern int xfrm_replay_check(struct xfrm_state *x, u32 seq); | |
900 | extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq); | |
f8cd5488 | 901 | extern void xfrm_replay_notify(struct xfrm_state *x, int event); |
1da177e4 LT |
902 | extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb); |
903 | extern int xfrm_state_mtu(struct xfrm_state *x, int mtu); | |
72cb6962 | 904 | extern int xfrm_init_state(struct xfrm_state *x); |
1da177e4 LT |
905 | extern int xfrm4_rcv(struct sk_buff *skb); |
906 | extern int xfrm4_output(struct sk_buff *skb); | |
907 | extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler); | |
908 | extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler); | |
951dbc8a PM |
909 | extern int xfrm6_rcv_spi(struct sk_buff **pskb, u32 spi); |
910 | extern int xfrm6_rcv(struct sk_buff **pskb); | |
1da177e4 LT |
911 | extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler); |
912 | extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler); | |
913 | extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr); | |
914 | extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr); | |
915 | extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr); | |
916 | extern int xfrm6_output(struct sk_buff *skb); | |
917 | ||
918 | #ifdef CONFIG_XFRM | |
919 | extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type); | |
920 | extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen); | |
921 | extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family); | |
922 | #else | |
923 | static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) | |
924 | { | |
925 | return -ENOPROTOOPT; | |
926 | } | |
927 | ||
928 | static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) | |
929 | { | |
930 | /* should not happen */ | |
931 | kfree_skb(skb); | |
932 | return 0; | |
933 | } | |
934 | static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family) | |
935 | { | |
936 | return -EINVAL; | |
937 | } | |
938 | #endif | |
939 | ||
dd0fc66f | 940 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp); |
1da177e4 LT |
941 | extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *); |
942 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); | |
df71837d TJ |
943 | struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel, |
944 | struct xfrm_sec_ctx *ctx, int delete); | |
1da177e4 LT |
945 | struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete); |
946 | void xfrm_policy_flush(void); | |
947 | u32 xfrm_get_acqseq(void); | |
948 | void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi); | |
949 | struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, | |
950 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
951 | int create, unsigned short family); | |
952 | extern void xfrm_policy_flush(void); | |
953 | extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); | |
954 | extern int xfrm_flush_bundles(void); | |
399c180a | 955 | extern void xfrm_flush_all_bundles(void); |
1da177e4 LT |
956 | extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family); |
957 | extern void xfrm_init_pmtu(struct dst_entry *dst); | |
958 | ||
959 | extern wait_queue_head_t km_waitq; | |
960 | extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport); | |
6c5c8ca7 | 961 | extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid); |
1da177e4 LT |
962 | |
963 | extern void xfrm_input_init(void); | |
964 | extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq); | |
965 | ||
966 | extern void xfrm_probe_algs(void); | |
967 | extern int xfrm_count_auth_supported(void); | |
968 | extern int xfrm_count_enc_supported(void); | |
969 | extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); | |
970 | extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); | |
971 | extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); | |
972 | extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); | |
973 | extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); | |
974 | extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe); | |
975 | extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe); | |
976 | extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe); | |
977 | ||
978 | struct crypto_tfm; | |
979 | typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int); | |
980 | ||
981 | extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm, | |
982 | int offset, int len, icv_update_fn_t icv_update); | |
983 | ||
984 | static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b, | |
985 | int family) | |
986 | { | |
987 | switch (family) { | |
988 | default: | |
989 | case AF_INET: | |
990 | return a->a4 - b->a4; | |
991 | case AF_INET6: | |
992 | return ipv6_addr_cmp((struct in6_addr *)a, | |
993 | (struct in6_addr *)b); | |
994 | } | |
995 | } | |
996 | ||
77d8d7a6 HX |
997 | static inline int xfrm_policy_id2dir(u32 index) |
998 | { | |
999 | return index & 7; | |
1000 | } | |
1001 | ||
f8cd5488 JHS |
1002 | static inline int xfrm_aevent_is_on(void) |
1003 | { | |
be33690d PM |
1004 | struct sock *nlsk; |
1005 | int ret = 0; | |
1006 | ||
1007 | rcu_read_lock(); | |
1008 | nlsk = rcu_dereference(xfrm_nl); | |
1009 | if (nlsk) | |
1010 | ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); | |
1011 | rcu_read_unlock(); | |
1012 | return ret; | |
f8cd5488 JHS |
1013 | } |
1014 | ||
1015 | static inline void xfrm_aevent_doreplay(struct xfrm_state *x) | |
1016 | { | |
1017 | if (xfrm_aevent_is_on()) | |
1018 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); | |
1019 | } | |
1020 | ||
1021 | ||
1da177e4 | 1022 | #endif /* _NET_XFRM_H */ |