projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[BLOCK] dm-crypt: Use block ciphers where applicable
[deliverable/linux.git] / include / net / xfrm.h
CommitLineData
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/pfkeyv2.h>
12#include <linux/in6.h>
4a3e2f71 13#include <linux/mutex.h>
1da177e4
LT		 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)
b59f45d0
HX		 22#define MODULE_ALIAS_XFRM_MODE(family, encap) \
23 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
1da177e4 24
f8cd5488
JHS		 25extern struct sock *xfrm_nl;
26extern u32 sysctl_xfrm_aevent_etime;
27extern u32 sysctl_xfrm_aevent_rseqth;
28
4a3e2f71 29extern struct mutex xfrm_cfg_mutex;
1da177e4
LT		 30
31/* Organization of SPD aka "XFRM rules"
32 ------------------------------------
33
34 Basic objects:
35 - policy rule, struct xfrm_policy (=SPD entry)
36 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
37 - instance of a transformer, struct xfrm_state (=SA)
38 - template to clone xfrm_state, struct xfrm_tmpl
39
40 SPD is plain linear list of xfrm_policy rules, ordered by priority.
41 (To be compatible with existing pfkeyv2 implementations,
42 many rules with priority of 0x7fffffff are allowed to exist and
43 such rules are ordered in an unpredictable way, thanks to bsd folks.)
44
45 Lookup is plain linear search until the first match with selector.
46
47 If "action" is "block", then we prohibit the flow, otherwise:
48 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
49 policy entry has list of up to XFRM_MAX_DEPTH transformations,
50 described by templates xfrm_tmpl. Each template is resolved
51 to a complete xfrm_state (see below) and we pack bundle of transformations
52 to a dst_entry returned to requestor.
53
54 dst -. xfrm .-> xfrm_state #1
55 |---. child .-> dst -. xfrm .-> xfrm_state #2
56 |---. child .-> dst -. xfrm .-> xfrm_state #3
57 |---. child .-> NULL
58
59 Bundles are cached at xrfm_policy struct (field ->bundles).
60
61
62 Resolution of xrfm_tmpl
63 -----------------------
64 Template contains:
65 1. ->mode Mode: transport or tunnel
66 2. ->id.proto Protocol: AH/ESP/IPCOMP
67 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
68 Q: allow to resolve security gateway?
69 4. ->id.spi If not zero, static SPI.
70 5. ->saddr Local tunnel endpoint, ignored for transport mode.
71 6. ->algos List of allowed algos. Plain bitmask now.
72 Q: ealgos, aalgos, calgos. What a mess...
73 7. ->share Sharing mode.
74 Q: how to implement private sharing mode? To add struct sock* to
75 flow id?
76
77 Having this template we search through SAD searching for entries
78 with appropriate mode/proto/algo, permitted by selector.
79 If no appropriate entry found, it is requested from key manager.
80
81 PROBLEMS:
82 Q: How to find all the bundles referring to a physical path for
83 PMTU discovery? Seems, dst should contain list of all parents...
84 and enter to infinite locking hierarchy disaster.
85 No! It is easier, we will not search for them, let them find us.
86 We add genid to each dst plus pointer to genid of raw IP route,
87 pmtu disc will update pmtu on raw IP route and increase its genid.
88 dst_check() will see this for top level and trigger resyncing
89 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
90 */
91
92/* Full description of state of transformer. */
93struct xfrm_state
94{
95 /* Note: bydst is re-used during gc */
96 struct list_head bydst;
97 struct list_head byspi;
98
99 atomic_t refcnt;
100 spinlock_t lock;
101
102 struct xfrm_id id;
103 struct xfrm_selector sel;
104
105 /* Key manger bits */
106 struct {
107 u8 state;
108 u8 dying;
109 u32 seq;
110 } km;
111
112 /* Parameters of this state. */
113 struct {
114 u32 reqid;
115 u8 mode;
116 u8 replay_window;
117 u8 aalgo, ealgo, calgo;
118 u8 flags;
119 u16 family;
120 xfrm_address_t saddr;
121 int header_len;
122 int trailer_len;
123 } props;
124
125 struct xfrm_lifetime_cfg lft;
126
127 /* Data for transformer */
128 struct xfrm_algo *aalg;
129 struct xfrm_algo *ealg;
130 struct xfrm_algo *calg;
131
132 /* Data for encapsulator */
133 struct xfrm_encap_tmpl *encap;
134
135 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
136 struct xfrm_state *tunnel;
137
138 /* If a tunnel, number of users + 1 */
139 atomic_t tunnel_users;
140
141 /* State for replay detection */
142 struct xfrm_replay_state replay;
143
f8cd5488
JHS		 144 /* Replay detection state at the time we sent the last notification */
145 struct xfrm_replay_state preplay;
146
2717096a
JHS		 147 /* internal flag that only holds state for delayed aevent at the
148 * moment
149 */
150 u32 xflags;
151
f8cd5488
JHS		 152 /* Replay detection notification settings */
153 u32 replay_maxage;
154 u32 replay_maxdiff;
155
156 /* Replay detection notification timer */
157 struct timer_list rtimer;
158
1da177e4
LT		 159 /* Statistics */
160 struct xfrm_stats stats;
161
162 struct xfrm_lifetime_cur curlft;
163 struct timer_list timer;
164
165 /* Reference to data common to all the instances of this
166 * transformer. */
167 struct xfrm_type *type;
b59f45d0 168 struct xfrm_mode *mode;
1da177e4 169
df71837d
TJ		 170 /* Security context */
171 struct xfrm_sec_ctx *security;
172
1da177e4
LT		 173 /* Private data of this transformer, format is opaque,
174 * interpreted by xfrm_type methods. */
175 void *data;
176};
177
2717096a
JHS		 178/* xflags - make enum if more show up */
179#define XFRM_TIME_DEFER 1
180
1da177e4
LT		 181enum {
182 XFRM_STATE_VOID,
183 XFRM_STATE_ACQ,
184 XFRM_STATE_VALID,
185 XFRM_STATE_ERROR,
186 XFRM_STATE_EXPIRED,
187 XFRM_STATE_DEAD
188};
189
26b15dad
JHS		 190/* callback structure passed from either netlink or pfkey */
191struct km_event
192{
bf08867f
HX		 193 union {
194 u32 hard;
195 u32 proto;
196 u32 byid;
f8cd5488 197 u32 aevent;
bf08867f
HX		 198 } data;
199
26b15dad
JHS		 200 u32 seq;
201 u32 pid;
202 u32 event;
203};
204
1da177e4
LT		 205struct xfrm_type;
206struct xfrm_dst;
207struct xfrm_policy_afinfo {
208 unsigned short family;
73654d61 209 struct xfrm_type *type_map[IPPROTO_MAX];
b59f45d0 210 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
1da177e4
LT		 211 struct dst_ops *dst_ops;
212 void (*garbage_collect)(void);
213 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
214 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
215 int (*bundle_create)(struct xfrm_policy *policy,
216 struct xfrm_state **xfrm,
217 int nx,
218 struct flowi *fl,
219 struct dst_entry **dst_p);
220 void (*decode_session)(struct sk_buff *skb,
221 struct flowi *fl);
222};
223
224extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
225extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
26b15dad
JHS		 226extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
227extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
1da177e4
LT		 228#define XFRM_ACQ_EXPIRES 30
229
230struct xfrm_tmpl;
980ebd25 231extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
53bc6b4d
JHS		 232extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
233extern int __xfrm_state_delete(struct xfrm_state *x);
234
1da177e4
LT		 235struct xfrm_state_afinfo {
236 unsigned short family;
1da177e4
LT		 237 struct list_head *state_bydst;
238 struct list_head *state_byspi;
d094cd83 239 int (*init_flags)(struct xfrm_state *x);
1da177e4
LT		 240 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
241 struct xfrm_tmpl *tmpl,
242 xfrm_address_t *daddr, xfrm_address_t *saddr);
243 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
244 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
245 xfrm_address_t *daddr, xfrm_address_t *saddr,
246 int create);
247};
248
249extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
250extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
251
252extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
253
1da177e4
LT		 254struct xfrm_type
255{
256 char *description;
257 struct module *owner;
258 __u8 proto;
259
72cb6962 260 int (*init_state)(struct xfrm_state *x);
1da177e4 261 void (*destructor)(struct xfrm_state *);
e695633e 262 int (*input)(struct xfrm_state *, struct sk_buff *skb);
1da177e4
LT		 263 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
264 /* Estimate maximal size of result of transformation of a dgram */
265 u32 (*get_max_size)(struct xfrm_state *, int size);
266};
267
1da177e4
LT		 268extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
269extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
270extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
271extern void xfrm_put_type(struct xfrm_type *type);
272
b59f45d0
HX		 273struct xfrm_mode {
274 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
275 int (*output)(struct sk_buff *skb);
276
277 struct module *owner;
278 unsigned int encap;
279};
280
281extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
282extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
283extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
284extern void xfrm_put_mode(struct xfrm_mode *mode);
285
1da177e4
LT		 286struct xfrm_tmpl
287{
288/* id in template is interpreted as:
289 * daddr - destination of tunnel, may be zero for transport mode.
290 * spi - zero to acquire spi. Not zero if spi is static, then
291 * daddr must be fixed too.
292 * proto - AH/ESP/IPCOMP
293 */
294 struct xfrm_id id;
295
296/* Source address of tunnel. Ignored, if it is not a tunnel. */
297 xfrm_address_t saddr;
298
299 __u32 reqid;
300
301/* Mode: transport/tunnel */
302 __u8 mode;
303
304/* Sharing mode: unique, this session only, this user only etc. */
305 __u8 share;
306
307/* May skip this transfomration if no SA is found */
308 __u8 optional;
309
310/* Bit mask of algos allowed for acquisition */
311 __u32 aalgos;
312 __u32 ealgos;
313 __u32 calgos;
314};
315
316#define XFRM_MAX_DEPTH 4
317
318struct xfrm_policy
319{
320 struct xfrm_policy *next;
321 struct list_head list;
322
323 /* This lock only affects elements except for entry. */
324 rwlock_t lock;
325 atomic_t refcnt;
326 struct timer_list timer;
327
328 u32 priority;
329 u32 index;
330 struct xfrm_selector selector;
331 struct xfrm_lifetime_cfg lft;
332 struct xfrm_lifetime_cur curlft;
333 struct dst_entry *bundles;
334 __u16 family;
335 __u8 action;
336 __u8 flags;
337 __u8 dead;
338 __u8 xfrm_nr;
df71837d 339 struct xfrm_sec_ctx *security;
1da177e4
LT		 340 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
341};
342
f8cd5488
JHS		 343#define XFRM_KM_TIMEOUT 30
344/* which seqno */
345#define XFRM_REPLAY_SEQ 1
346#define XFRM_REPLAY_OSEQ 2
347#define XFRM_REPLAY_SEQ_MASK 3
348/* what happened */
349#define XFRM_REPLAY_UPDATE XFRM_AE_CR
350#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
351
352/* default aevent timeout in units of 100ms */
353#define XFRM_AE_ETIME 10
354/* Async Event timer multiplier */
355#define XFRM_AE_ETH_M 10
356/* default seq threshold size */
357#define XFRM_AE_SEQT_SIZE 2
1da177e4
LT		 358
359struct xfrm_mgr
360{
361 struct list_head list;
362 char *id;
26b15dad 363 int (*notify)(struct xfrm_state *x, struct km_event *c);
1da177e4
LT		 364 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
365 struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
366 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
26b15dad 367 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
1da177e4
LT		 368};
369
370extern int xfrm_register_km(struct xfrm_mgr *km);
371extern int xfrm_unregister_km(struct xfrm_mgr *km);
372
373
374extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
375
376static inline void xfrm_pol_hold(struct xfrm_policy *policy)
377{
378 if (likely(policy != NULL))
379 atomic_inc(&policy->refcnt);
380}
381
382extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
383
384static inline void xfrm_pol_put(struct xfrm_policy *policy)
385{
386 if (atomic_dec_and_test(&policy->refcnt))
387 __xfrm_policy_destroy(policy);
388}
389
390#define XFRM_DST_HSIZE 1024
391
392static __inline__
393unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
394{
395 unsigned h;
396 h = ntohl(addr->a4);
397 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
398 return h;
399}
400
401static __inline__
402unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
403{
404 unsigned h;
405 h = ntohl(addr->a6[2]^addr->a6[3]);
406 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
407 return h;
408}
409
410static __inline__
411unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
412{
413 switch (family) {
414 case AF_INET:
415 return __xfrm4_dst_hash(addr);
416 case AF_INET6:
417 return __xfrm6_dst_hash(addr);
418 }
419 return 0;
420}
421
422static __inline__
423unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
424{
425 unsigned h;
426 h = ntohl(addr->a4^spi^proto);
427 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
428 return h;
429}
430
431static __inline__
432unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
433{
434 unsigned h;
435 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
436 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
437 return h;
438}
439
440static __inline__
441unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
442{
443 switch (family) {
444 case AF_INET:
445 return __xfrm4_spi_hash(addr, spi, proto);
446 case AF_INET6:
447 return __xfrm6_spi_hash(addr, spi, proto);
448 }
449 return 0; /*XXX*/
450}
451
452extern void __xfrm_state_destroy(struct xfrm_state *);
453
21380b81
HX		 454static inline void __xfrm_state_put(struct xfrm_state *x)
455{
456 atomic_dec(&x->refcnt);
457}
458
1da177e4
LT		 459static inline void xfrm_state_put(struct xfrm_state *x)
460{
461 if (atomic_dec_and_test(&x->refcnt))
462 __xfrm_state_destroy(x);
463}
464
465static inline void xfrm_state_hold(struct xfrm_state *x)
466{
467 atomic_inc(&x->refcnt);
468}
469
470static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
471{
472 __u32 *a1 = token1;
473 __u32 *a2 = token2;
474 int pdw;
475 int pbi;
476
477 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
478 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
479
480 if (pdw)
481 if (memcmp(a1, a2, pdw << 2))
482 return 0;
483
484 if (pbi) {
485 __u32 mask;
486
487 mask = htonl((0xffffffff) << (32 - pbi));
488
489 if ((a1[pdw] ^ a2[pdw]) & mask)
490 return 0;
491 }
492
493 return 1;
494}
495
496static __inline__
497u16 xfrm_flowi_sport(struct flowi *fl)
498{
499 u16 port;
500 switch(fl->proto) {
501 case IPPROTO_TCP:
502 case IPPROTO_UDP:
503 case IPPROTO_SCTP:
504 port = fl->fl_ip_sport;
505 break;
506 case IPPROTO_ICMP:
507 case IPPROTO_ICMPV6:
508 port = htons(fl->fl_icmp_type);
509 break;
510 default:
511 port = 0; /*XXX*/
512 }
513 return port;
514}
515
516static __inline__
517u16 xfrm_flowi_dport(struct flowi *fl)
518{
519 u16 port;
520 switch(fl->proto) {
521 case IPPROTO_TCP:
522 case IPPROTO_UDP:
523 case IPPROTO_SCTP:
524 port = fl->fl_ip_dport;
525 break;
526 case IPPROTO_ICMP:
527 case IPPROTO_ICMPV6:
528 port = htons(fl->fl_icmp_code);
529 break;
530 default:
531 port = 0; /*XXX*/
532 }
533 return port;
534}
535
536static inline int
537__xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
538{
539 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
540 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
541 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
542 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
543 (fl->proto == sel->proto || !sel->proto) &&
544 (fl->oif == sel->ifindex || !sel->ifindex);
545}
546
547static inline int
548__xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
549{
550 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
551 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
552 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
553 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
554 (fl->proto == sel->proto || !sel->proto) &&
555 (fl->oif == sel->ifindex || !sel->ifindex);
556}
557
558static inline int
559xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
560 unsigned short family)
561{
562 switch (family) {
563 case AF_INET:
564 return __xfrm4_selector_match(sel, fl);
565 case AF_INET6:
566 return __xfrm6_selector_match(sel, fl);
567 }
568 return 0;
569}
570
df71837d
TJ		 571#ifdef CONFIG_SECURITY_NETWORK_XFRM
572/* If neither has a context --> match
573 * Otherwise, both must have a context and the sids, doi, alg must match
574 */
575static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
576{
577 return ((!s1 && !s2) ||
578 (s1 && s2 &&
579 (s1->ctx_sid == s2->ctx_sid) &&
580 (s1->ctx_doi == s2->ctx_doi) &&
581 (s1->ctx_alg == s2->ctx_alg)));
582}
583#else
584static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
585{
586 return 1;
587}
588#endif
589
1da177e4
LT		 590/* A struct encoding bundle of transformations to apply to some set of flow.
591 *
592 * dst->child points to the next element of bundle.
593 * dst->xfrm points to an instanse of transformer.
594 *
595 * Due to unfortunate limitations of current routing cache, which we
596 * have no time to fix, it mirrors struct rtable and bound to the same
597 * routing key, including saddr,daddr. However, we can have many of
598 * bundles differing by session id. All the bundles grow from a parent
599 * policy rule.
600 */
601struct xfrm_dst
602{
603 union {
604 struct xfrm_dst *next;
605 struct dst_entry dst;
606 struct rtable rt;
607 struct rt6_info rt6;
608 } u;
609 struct dst_entry *route;
610 u32 route_mtu_cached;
611 u32 child_mtu_cached;
92d63dec
HY		 612 u32 route_cookie;
613 u32 path_cookie;
1da177e4
LT		 614};
615
aabc9761
HX		 616static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
617{
618 dst_release(xdst->route);
619 if (likely(xdst->u.dst.xfrm))
620 xfrm_state_put(xdst->u.dst.xfrm);
621}
622
623extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
624
1da177e4
LT		 625struct sec_path
626{
627 atomic_t refcnt;
628 int len;
dbe5b4aa 629 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
1da177e4
LT		 630};
631
632static inline struct sec_path *
633secpath_get(struct sec_path *sp)
634{
635 if (sp)
636 atomic_inc(&sp->refcnt);
637 return sp;
638}
639
640extern void __secpath_destroy(struct sec_path *sp);
641
642static inline void
643secpath_put(struct sec_path *sp)
644{
645 if (sp && atomic_dec_and_test(&sp->refcnt))
646 __secpath_destroy(sp);
647}
648
649extern struct sec_path *secpath_dup(struct sec_path *src);
650
651static inline void
652secpath_reset(struct sk_buff *skb)
653{
654#ifdef CONFIG_XFRM
655 secpath_put(skb->sp);
656 skb->sp = NULL;
657#endif
658}
659
660static inline int
661__xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
662{
663 return (tmpl->saddr.a4 &&
664 tmpl->saddr.a4 != x->props.saddr.a4);
665}
666
667static inline int
668__xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
669{
670 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
671 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
672}
673
674static inline int
675xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
676{
677 switch (family) {
678 case AF_INET:
679 return __xfrm4_state_addr_cmp(tmpl, x);
680 case AF_INET6:
681 return __xfrm6_state_addr_cmp(tmpl, x);
682 }
683 return !0;
684}
685
686#ifdef CONFIG_XFRM
687
688extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
689
690static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
691{
692 if (sk && sk->sk_policy[XFRM_POLICY_IN])
693 return __xfrm_policy_check(sk, dir, skb, family);
694
695 return (!xfrm_policy_list[dir] && !skb->sp) ||
696 (skb->dst->flags & DST_NOPOLICY) ||
697 __xfrm_policy_check(sk, dir, skb, family);
698}
699
700static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
701{
702 return xfrm_policy_check(sk, dir, skb, AF_INET);
703}
704
705static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
706{
707 return xfrm_policy_check(sk, dir, skb, AF_INET6);
708}
709
3e3850e9 710extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
1da177e4
LT		 711extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
712
713static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
714{
715 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
716 (skb->dst->flags & DST_NOXFRM) ||
717 __xfrm_route_forward(skb, family);
718}
719
720static inline int xfrm4_route_forward(struct sk_buff *skb)
721{
722 return xfrm_route_forward(skb, AF_INET);
723}
724
725static inline int xfrm6_route_forward(struct sk_buff *skb)
726{
727 return xfrm_route_forward(skb, AF_INET6);
728}
729
730extern int __xfrm_sk_clone_policy(struct sock *sk);
731
732static inline int xfrm_sk_clone_policy(struct sock *sk)
733{
734 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
735 return __xfrm_sk_clone_policy(sk);
736 return 0;
737}
738
4666faab 739extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1da177e4
LT		 740
741static inline void xfrm_sk_free_policy(struct sock *sk)
742{
743 if (unlikely(sk->sk_policy[0] != NULL)) {
744 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
745 sk->sk_policy[0] = NULL;
746 }
747 if (unlikely(sk->sk_policy[1] != NULL)) {
748 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
749 sk->sk_policy[1] = NULL;
750 }
751}
752
753#else
754
755static inline void xfrm_sk_free_policy(struct sock *sk) {}
756static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
757static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
758static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
759static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
760{
761 return 1;
762}
763static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
764{
765 return 1;
766}
767static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
768{
769 return 1;
770}
771#endif
772
773static __inline__
774xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
775{
776 switch (family){
777 case AF_INET:
778 return (xfrm_address_t *)&fl->fl4_dst;
779 case AF_INET6:
780 return (xfrm_address_t *)&fl->fl6_dst;
781 }
782 return NULL;
783}
784
785static __inline__
786xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
787{
788 switch (family){
789 case AF_INET:
790 return (xfrm_address_t *)&fl->fl4_src;
791 case AF_INET6:
792 return (xfrm_address_t *)&fl->fl6_src;
793 }
794 return NULL;
795}
796
797static __inline__ int
798__xfrm4_state_addr_check(struct xfrm_state *x,
799 xfrm_address_t *daddr, xfrm_address_t *saddr)
800{
801 if (daddr->a4 == x->id.daddr.a4 &&
802 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
803 return 1;
804 return 0;
805}
806
807static __inline__ int
808__xfrm6_state_addr_check(struct xfrm_state *x,
809 xfrm_address_t *daddr, xfrm_address_t *saddr)
810{
811 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
812 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
813 ipv6_addr_any((struct in6_addr *)saddr) ||
814 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
815 return 1;
816 return 0;
817}
818
819static __inline__ int
820xfrm_state_addr_check(struct xfrm_state *x,
821 xfrm_address_t *daddr, xfrm_address_t *saddr,
822 unsigned short family)
823{
824 switch (family) {
825 case AF_INET:
826 return __xfrm4_state_addr_check(x, daddr, saddr);
827 case AF_INET6:
828 return __xfrm6_state_addr_check(x, daddr, saddr);
829 }
830 return 0;
831}
832
833static inline int xfrm_state_kern(struct xfrm_state *x)
834{
835 return atomic_read(&x->tunnel_users);
836}
837
838/*
839 * xfrm algorithm information
840 */
841struct xfrm_algo_auth_info {
842 u16 icv_truncbits;
843 u16 icv_fullbits;
844};
845
846struct xfrm_algo_encr_info {
847 u16 blockbits;
848 u16 defkeybits;
849};
850
851struct xfrm_algo_comp_info {
852 u16 threshold;
853};
854
855struct xfrm_algo_desc {
856 char *name;
857 u8 available:1;
858 union {
859 struct xfrm_algo_auth_info auth;
860 struct xfrm_algo_encr_info encr;
861 struct xfrm_algo_comp_info comp;
862 } uinfo;
863 struct sadb_alg desc;
864};
865
866/* XFRM tunnel handlers. */
867struct xfrm_tunnel {
868 int (*handler)(struct sk_buff *skb);
d2acc347
HX		 869 int (*err_handler)(struct sk_buff *skb, __u32 info);
870
871 struct xfrm_tunnel *next;
872 int priority;
1da177e4
LT		 873};
874
875struct xfrm6_tunnel {
d2acc347
HX		 876 int (*handler)(struct sk_buff *skb);
877 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
878 int type, int code, int offset, __u32 info);
879
880 struct xfrm6_tunnel *next;
881 int priority;
1da177e4
LT		 882};
883
884extern void xfrm_init(void);
885extern void xfrm4_init(void);
886extern void xfrm6_init(void);
887extern void xfrm6_fini(void);
888extern void xfrm_state_init(void);
889extern void xfrm4_state_init(void);
1da177e4
LT		 890extern void xfrm6_state_init(void);
891extern void xfrm6_state_fini(void);
892
893extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
894extern struct xfrm_state *xfrm_state_alloc(void);
895extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
896 struct flowi *fl, struct xfrm_tmpl *tmpl,
897 struct xfrm_policy *pol, int *err,
898 unsigned short family);
899extern int xfrm_state_check_expire(struct xfrm_state *x);
900extern void xfrm_state_insert(struct xfrm_state *x);
901extern int xfrm_state_add(struct xfrm_state *x);
902extern int xfrm_state_update(struct xfrm_state *x);
903extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
904extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
26b15dad 905extern int xfrm_state_delete(struct xfrm_state *x);
1da177e4
LT		 906extern void xfrm_state_flush(u8 proto);
907extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
908extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
f8cd5488 909extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1da177e4
LT		 910extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
911extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
72cb6962 912extern int xfrm_init_state(struct xfrm_state *x);
1da177e4
LT		 913extern int xfrm4_rcv(struct sk_buff *skb);
914extern int xfrm4_output(struct sk_buff *skb);
915extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
916extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
d2acc347 917extern int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi);
951dbc8a 918extern int xfrm6_rcv(struct sk_buff **pskb);
1da177e4
LT		 919extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
920extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
921extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
922extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
923extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
924extern int xfrm6_output(struct sk_buff *skb);
925
926#ifdef CONFIG_XFRM
927extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
928extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
929extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
930#else
931static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
932{
933 return -ENOPROTOOPT;
934}
935
936static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
937{
938 /* should not happen */
939 kfree_skb(skb);
940 return 0;
941}
942static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
943{
944 return -EINVAL;
945}
946#endif
947
dd0fc66f 948struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1da177e4
LT		 949extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
950int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
df71837d
TJ		 951struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
952 struct xfrm_sec_ctx *ctx, int delete);
1da177e4
LT		 953struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
954void xfrm_policy_flush(void);
955u32 xfrm_get_acqseq(void);
956void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
957struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
958 xfrm_address_t *daddr, xfrm_address_t *saddr,
959 int create, unsigned short family);
960extern void xfrm_policy_flush(void);
961extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
962extern int xfrm_flush_bundles(void);
399c180a 963extern void xfrm_flush_all_bundles(void);
1da177e4
LT		 964extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
965extern void xfrm_init_pmtu(struct dst_entry *dst);
966
967extern wait_queue_head_t km_waitq;
968extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
6c5c8ca7 969extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1da177e4
LT		 970
971extern void xfrm_input_init(void);
972extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
973
974extern void xfrm_probe_algs(void);
975extern int xfrm_count_auth_supported(void);
976extern int xfrm_count_enc_supported(void);
977extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
978extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
979extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
980extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
981extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
982extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
983extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
984extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
985
986struct crypto_tfm;
9409f38a 987struct scatterlist;
1da177e4
LT		 988typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
989
990extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
991 int offset, int len, icv_update_fn_t icv_update);
992
993static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
994 int family)
995{
996 switch (family) {
997 default:
998 case AF_INET:
999 return a->a4 - b->a4;
1000 case AF_INET6:
1001 return ipv6_addr_cmp((struct in6_addr *)a,
1002 (struct in6_addr *)b);
1003 }
1004}
1005
77d8d7a6
HX		 1006static inline int xfrm_policy_id2dir(u32 index)
1007{
1008 return index & 7;
1009}
1010
f8cd5488
JHS		 1011static inline int xfrm_aevent_is_on(void)
1012{
be33690d
PM		 1013 struct sock *nlsk;
1014 int ret = 0;
1015
1016 rcu_read_lock();
1017 nlsk = rcu_dereference(xfrm_nl);
1018 if (nlsk)
1019 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1020 rcu_read_unlock();
1021 return ret;
f8cd5488
JHS		 1022}
1023
1024static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1025{
1026 if (xfrm_aevent_is_on())
1027 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1028}
1029
1030
1da177e4 1031#endif /* _NET_XFRM_H */
Linux kernel - Deliverables
This page took 0.256836 seconds and 5 git commands to generate.