projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
[IPSEC]: Move xfrm_state_check into xfrm_output.c
[deliverable/linux.git] / include / net / xfrm.h
1 #ifndef _NET_XFRM_H
2 #define _NET_XFRM_H
3
4 #include <linux/compiler.h>
5 #include <linux/in.h>
6 #include <linux/xfrm.h>
7 #include <linux/spinlock.h>
8 #include <linux/list.h>
9 #include <linux/skbuff.h>
10 #include <linux/socket.h>
11 #include <linux/pfkeyv2.h>
12 #include <linux/ipsec.h>
13 #include <linux/in6.h>
14 #include <linux/mutex.h>
15 #include <linux/audit.h>
16
17 #include <net/sock.h>
18 #include <net/dst.h>
19 #include <net/route.h>
20 #include <net/ipv6.h>
21 #include <net/ip6_fib.h>
22
23 #define XFRM_PROTO_ESP 50
24 #define XFRM_PROTO_AH 51
25 #define XFRM_PROTO_COMP 108
26 #define XFRM_PROTO_IPIP 4
27 #define XFRM_PROTO_IPV6 41
28 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
29 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
30
31 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
32 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
33 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
34 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
35 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
36
37 extern struct sock *xfrm_nl;
38 extern u32 sysctl_xfrm_aevent_etime;
39 extern u32 sysctl_xfrm_aevent_rseqth;
40
41 extern struct mutex xfrm_cfg_mutex;
42
43 /* Organization of SPD aka "XFRM rules"
44 ------------------------------------
45
46 Basic objects:
47 - policy rule, struct xfrm_policy (=SPD entry)
48 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
49 - instance of a transformer, struct xfrm_state (=SA)
50 - template to clone xfrm_state, struct xfrm_tmpl
51
52 SPD is plain linear list of xfrm_policy rules, ordered by priority.
53 (To be compatible with existing pfkeyv2 implementations,
54 many rules with priority of 0x7fffffff are allowed to exist and
55 such rules are ordered in an unpredictable way, thanks to bsd folks.)
56
57 Lookup is plain linear search until the first match with selector.
58
59 If "action" is "block", then we prohibit the flow, otherwise:
60 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
61 policy entry has list of up to XFRM_MAX_DEPTH transformations,
62 described by templates xfrm_tmpl. Each template is resolved
63 to a complete xfrm_state (see below) and we pack bundle of transformations
64 to a dst_entry returned to requestor.
65
66 dst -. xfrm .-> xfrm_state #1
67 |---. child .-> dst -. xfrm .-> xfrm_state #2
68 |---. child .-> dst -. xfrm .-> xfrm_state #3
69 |---. child .-> NULL
70
71 Bundles are cached at xrfm_policy struct (field ->bundles).
72
73
74 Resolution of xrfm_tmpl
75 -----------------------
76 Template contains:
77 1. ->mode Mode: transport or tunnel
78 2. ->id.proto Protocol: AH/ESP/IPCOMP
79 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
80 Q: allow to resolve security gateway?
81 4. ->id.spi If not zero, static SPI.
82 5. ->saddr Local tunnel endpoint, ignored for transport mode.
83 6. ->algos List of allowed algos. Plain bitmask now.
84 Q: ealgos, aalgos, calgos. What a mess...
85 7. ->share Sharing mode.
86 Q: how to implement private sharing mode? To add struct sock* to
87 flow id?
88
89 Having this template we search through SAD searching for entries
90 with appropriate mode/proto/algo, permitted by selector.
91 If no appropriate entry found, it is requested from key manager.
92
93 PROBLEMS:
94 Q: How to find all the bundles referring to a physical path for
95 PMTU discovery? Seems, dst should contain list of all parents...
96 and enter to infinite locking hierarchy disaster.
97 No! It is easier, we will not search for them, let them find us.
98 We add genid to each dst plus pointer to genid of raw IP route,
99 pmtu disc will update pmtu on raw IP route and increase its genid.
100 dst_check() will see this for top level and trigger resyncing
101 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
102 */
103
104 /* Full description of state of transformer. */
105 struct xfrm_state
106 {
107 /* Note: bydst is re-used during gc */
108 struct hlist_node bydst;
109 struct hlist_node bysrc;
110 struct hlist_node byspi;
111
112 atomic_t refcnt;
113 spinlock_t lock;
114
115 struct xfrm_id id;
116 struct xfrm_selector sel;
117
118 u32 genid;
119
120 /* Key manger bits */
121 struct {
122 u8 state;
123 u8 dying;
124 u32 seq;
125 } km;
126
127 /* Parameters of this state. */
128 struct {
129 u32 reqid;
130 u8 mode;
131 u8 replay_window;
132 u8 aalgo, ealgo, calgo;
133 u8 flags;
134 u16 family;
135 xfrm_address_t saddr;
136 int header_len;
137 int trailer_len;
138 } props;
139
140 struct xfrm_lifetime_cfg lft;
141
142 /* Data for transformer */
143 struct xfrm_algo *aalg;
144 struct xfrm_algo *ealg;
145 struct xfrm_algo *calg;
146
147 /* Data for encapsulator */
148 struct xfrm_encap_tmpl *encap;
149
150 /* Data for care-of address */
151 xfrm_address_t *coaddr;
152
153 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
154 struct xfrm_state *tunnel;
155
156 /* If a tunnel, number of users + 1 */
157 atomic_t tunnel_users;
158
159 /* State for replay detection */
160 struct xfrm_replay_state replay;
161
162 /* Replay detection state at the time we sent the last notification */
163 struct xfrm_replay_state preplay;
164
165 /* internal flag that only holds state for delayed aevent at the
166 * moment
167 */
168 u32 xflags;
169
170 /* Replay detection notification settings */
171 u32 replay_maxage;
172 u32 replay_maxdiff;
173
174 /* Replay detection notification timer */
175 struct timer_list rtimer;
176
177 /* Statistics */
178 struct xfrm_stats stats;
179
180 struct xfrm_lifetime_cur curlft;
181 struct timer_list timer;
182
183 /* Last used time */
184 u64 lastused;
185
186 /* Reference to data common to all the instances of this
187 * transformer. */
188 struct xfrm_type *type;
189 struct xfrm_mode *mode;
190
191 /* Security context */
192 struct xfrm_sec_ctx *security;
193
194 /* Private data of this transformer, format is opaque,
195 * interpreted by xfrm_type methods. */
196 void *data;
197 };
198
199 /* xflags - make enum if more show up */
200 #define XFRM_TIME_DEFER 1
201
202 enum {
203 XFRM_STATE_VOID,
204 XFRM_STATE_ACQ,
205 XFRM_STATE_VALID,
206 XFRM_STATE_ERROR,
207 XFRM_STATE_EXPIRED,
208 XFRM_STATE_DEAD
209 };
210
211 /* callback structure passed from either netlink or pfkey */
212 struct km_event
213 {
214 union {
215 u32 hard;
216 u32 proto;
217 u32 byid;
218 u32 aevent;
219 u32 type;
220 } data;
221
222 u32 seq;
223 u32 pid;
224 u32 event;
225 };
226
227 struct xfrm_type;
228 struct xfrm_dst;
229 struct xfrm_policy_afinfo {
230 unsigned short family;
231 struct xfrm_type *type_map[IPPROTO_MAX];
232 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
233 struct dst_ops *dst_ops;
234 void (*garbage_collect)(void);
235 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
236 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
237 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
238 int (*bundle_create)(struct xfrm_policy *policy,
239 struct xfrm_state **xfrm,
240 int nx,
241 struct flowi *fl,
242 struct dst_entry **dst_p);
243 void (*decode_session)(struct sk_buff *skb,
244 struct flowi *fl);
245 };
246
247 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
248 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
249 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
250 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
251
252 struct xfrm_tmpl;
253 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
254 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
255 extern int __xfrm_state_delete(struct xfrm_state *x);
256
257 struct xfrm_state_afinfo {
258 unsigned short family;
259 int (*init_flags)(struct xfrm_state *x);
260 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
261 struct xfrm_tmpl *tmpl,
262 xfrm_address_t *daddr, xfrm_address_t *saddr);
263 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
264 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
265 int (*output)(struct sk_buff *skb);
266 };
267
268 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
269 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
270 extern struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family);
271 extern void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
272
273 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
274
275 struct xfrm_type
276 {
277 char *description;
278 struct module *owner;
279 __u8 proto;
280 __u8 flags;
281 #define XFRM_TYPE_NON_FRAGMENT 1
282
283 int (*init_state)(struct xfrm_state *x);
284 void (*destructor)(struct xfrm_state *);
285 int (*input)(struct xfrm_state *, struct sk_buff *skb);
286 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
287 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
288 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
289 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
290 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
291 /* Estimate maximal size of result of transformation of a dgram */
292 u32 (*get_mtu)(struct xfrm_state *, int size);
293 };
294
295 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
296 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
297 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
298 extern void xfrm_put_type(struct xfrm_type *type);
299
300 struct xfrm_mode {
301 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
302 int (*output)(struct xfrm_state *x,struct sk_buff *skb);
303
304 struct module *owner;
305 unsigned int encap;
306 };
307
308 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
309 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
310 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
311 extern void xfrm_put_mode(struct xfrm_mode *mode);
312
313 struct xfrm_tmpl
314 {
315 /* id in template is interpreted as:
316 * daddr - destination of tunnel, may be zero for transport mode.
317 * spi - zero to acquire spi. Not zero if spi is static, then
318 * daddr must be fixed too.
319 * proto - AH/ESP/IPCOMP
320 */
321 struct xfrm_id id;
322
323 /* Source address of tunnel. Ignored, if it is not a tunnel. */
324 xfrm_address_t saddr;
325
326 unsigned short encap_family;
327
328 __u32 reqid;
329
330 /* Mode: transport, tunnel etc. */
331 __u8 mode;
332
333 /* Sharing mode: unique, this session only, this user only etc. */
334 __u8 share;
335
336 /* May skip this transfomration if no SA is found */
337 __u8 optional;
338
339 /* Bit mask of algos allowed for acquisition */
340 __u32 aalgos;
341 __u32 ealgos;
342 __u32 calgos;
343 };
344
345 #define XFRM_MAX_DEPTH 6
346
347 struct xfrm_policy
348 {
349 struct xfrm_policy *next;
350 struct hlist_node bydst;
351 struct hlist_node byidx;
352
353 /* This lock only affects elements except for entry. */
354 rwlock_t lock;
355 atomic_t refcnt;
356 struct timer_list timer;
357
358 u32 priority;
359 u32 index;
360 struct xfrm_selector selector;
361 struct xfrm_lifetime_cfg lft;
362 struct xfrm_lifetime_cur curlft;
363 struct dst_entry *bundles;
364 u16 family;
365 u8 type;
366 u8 action;
367 u8 flags;
368 u8 dead;
369 u8 xfrm_nr;
370 /* XXX 1 byte hole, try to pack */
371 struct xfrm_sec_ctx *security;
372 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
373 };
374
375 struct xfrm_migrate {
376 xfrm_address_t old_daddr;
377 xfrm_address_t old_saddr;
378 xfrm_address_t new_daddr;
379 xfrm_address_t new_saddr;
380 u8 proto;
381 u8 mode;
382 u16 reserved;
383 u32 reqid;
384 u16 old_family;
385 u16 new_family;
386 };
387
388 #define XFRM_KM_TIMEOUT 30
389 /* which seqno */
390 #define XFRM_REPLAY_SEQ 1
391 #define XFRM_REPLAY_OSEQ 2
392 #define XFRM_REPLAY_SEQ_MASK 3
393 /* what happened */
394 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
395 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
396
397 /* default aevent timeout in units of 100ms */
398 #define XFRM_AE_ETIME 10
399 /* Async Event timer multiplier */
400 #define XFRM_AE_ETH_M 10
401 /* default seq threshold size */
402 #define XFRM_AE_SEQT_SIZE 2
403
404 struct xfrm_mgr
405 {
406 struct list_head list;
407 char *id;
408 int (*notify)(struct xfrm_state *x, struct km_event *c);
409 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
410 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
411 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
412 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
413 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
414 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
415 };
416
417 extern int xfrm_register_km(struct xfrm_mgr *km);
418 extern int xfrm_unregister_km(struct xfrm_mgr *km);
419
420 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
421
422 /* Audit Information */
423 struct xfrm_audit
424 {
425 u32 loginuid;
426 u32 secid;
427 };
428
429 #ifdef CONFIG_AUDITSYSCALL
430 static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
431 {
432 struct audit_buffer *audit_buf = NULL;
433 char *secctx;
434 u32 secctx_len;
435
436 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
437 AUDIT_MAC_IPSEC_EVENT);
438 if (audit_buf == NULL)
439 return NULL;
440
441 audit_log_format(audit_buf, "auid=%u", auid);
442
443 if (sid != 0 &&
444 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {
445 audit_log_format(audit_buf, " subj=%s", secctx);
446 security_release_secctx(secctx, secctx_len);
447 } else
448 audit_log_task_context(audit_buf);
449 return audit_buf;
450 }
451
452 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
453 u32 auid, u32 sid);
454 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
455 u32 auid, u32 sid);
456 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
457 u32 auid, u32 sid);
458 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
459 u32 auid, u32 sid);
460 #else
461 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
462 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
463 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
464 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
465 #endif /* CONFIG_AUDITSYSCALL */
466
467 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
468 {
469 if (likely(policy != NULL))
470 atomic_inc(&policy->refcnt);
471 }
472
473 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
474
475 static inline void xfrm_pol_put(struct xfrm_policy *policy)
476 {
477 if (atomic_dec_and_test(&policy->refcnt))
478 __xfrm_policy_destroy(policy);
479 }
480
481 #ifdef CONFIG_XFRM_SUB_POLICY
482 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
483 {
484 int i;
485 for (i = npols - 1; i >= 0; --i)
486 xfrm_pol_put(pols[i]);
487 }
488 #else
489 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
490 {
491 xfrm_pol_put(pols[0]);
492 }
493 #endif
494
495 extern void __xfrm_state_destroy(struct xfrm_state *);
496
497 static inline void __xfrm_state_put(struct xfrm_state *x)
498 {
499 atomic_dec(&x->refcnt);
500 }
501
502 static inline void xfrm_state_put(struct xfrm_state *x)
503 {
504 if (atomic_dec_and_test(&x->refcnt))
505 __xfrm_state_destroy(x);
506 }
507
508 static inline void xfrm_state_hold(struct xfrm_state *x)
509 {
510 atomic_inc(&x->refcnt);
511 }
512
513 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
514 {
515 __be32 *a1 = token1;
516 __be32 *a2 = token2;
517 int pdw;
518 int pbi;
519
520 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
521 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
522
523 if (pdw)
524 if (memcmp(a1, a2, pdw << 2))
525 return 0;
526
527 if (pbi) {
528 __be32 mask;
529
530 mask = htonl((0xffffffff) << (32 - pbi));
531
532 if ((a1[pdw] ^ a2[pdw]) & mask)
533 return 0;
534 }
535
536 return 1;
537 }
538
539 static __inline__
540 __be16 xfrm_flowi_sport(struct flowi *fl)
541 {
542 __be16 port;
543 switch(fl->proto) {
544 case IPPROTO_TCP:
545 case IPPROTO_UDP:
546 case IPPROTO_UDPLITE:
547 case IPPROTO_SCTP:
548 port = fl->fl_ip_sport;
549 break;
550 case IPPROTO_ICMP:
551 case IPPROTO_ICMPV6:
552 port = htons(fl->fl_icmp_type);
553 break;
554 case IPPROTO_MH:
555 port = htons(fl->fl_mh_type);
556 break;
557 default:
558 port = 0; /*XXX*/
559 }
560 return port;
561 }
562
563 static __inline__
564 __be16 xfrm_flowi_dport(struct flowi *fl)
565 {
566 __be16 port;
567 switch(fl->proto) {
568 case IPPROTO_TCP:
569 case IPPROTO_UDP:
570 case IPPROTO_UDPLITE:
571 case IPPROTO_SCTP:
572 port = fl->fl_ip_dport;
573 break;
574 case IPPROTO_ICMP:
575 case IPPROTO_ICMPV6:
576 port = htons(fl->fl_icmp_code);
577 break;
578 default:
579 port = 0; /*XXX*/
580 }
581 return port;
582 }
583
584 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
585 unsigned short family);
586
587 #ifdef CONFIG_SECURITY_NETWORK_XFRM
588 /* If neither has a context --> match
589 * Otherwise, both must have a context and the sids, doi, alg must match
590 */
591 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
592 {
593 return ((!s1 && !s2) ||
594 (s1 && s2 &&
595 (s1->ctx_sid == s2->ctx_sid) &&
596 (s1->ctx_doi == s2->ctx_doi) &&
597 (s1->ctx_alg == s2->ctx_alg)));
598 }
599 #else
600 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
601 {
602 return 1;
603 }
604 #endif
605
606 /* A struct encoding bundle of transformations to apply to some set of flow.
607 *
608 * dst->child points to the next element of bundle.
609 * dst->xfrm points to an instanse of transformer.
610 *
611 * Due to unfortunate limitations of current routing cache, which we
612 * have no time to fix, it mirrors struct rtable and bound to the same
613 * routing key, including saddr,daddr. However, we can have many of
614 * bundles differing by session id. All the bundles grow from a parent
615 * policy rule.
616 */
617 struct xfrm_dst
618 {
619 union {
620 struct dst_entry dst;
621 struct rtable rt;
622 struct rt6_info rt6;
623 } u;
624 struct dst_entry *route;
625 #ifdef CONFIG_XFRM_SUB_POLICY
626 struct flowi *origin;
627 struct xfrm_selector *partner;
628 #endif
629 u32 genid;
630 u32 route_mtu_cached;
631 u32 child_mtu_cached;
632 u32 route_cookie;
633 u32 path_cookie;
634 };
635
636 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
637 {
638 dst_release(xdst->route);
639 if (likely(xdst->u.dst.xfrm))
640 xfrm_state_put(xdst->u.dst.xfrm);
641 #ifdef CONFIG_XFRM_SUB_POLICY
642 kfree(xdst->origin);
643 xdst->origin = NULL;
644 kfree(xdst->partner);
645 xdst->partner = NULL;
646 #endif
647 }
648
649 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
650
651 struct sec_path
652 {
653 atomic_t refcnt;
654 int len;
655 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
656 };
657
658 static inline struct sec_path *
659 secpath_get(struct sec_path *sp)
660 {
661 if (sp)
662 atomic_inc(&sp->refcnt);
663 return sp;
664 }
665
666 extern void __secpath_destroy(struct sec_path *sp);
667
668 static inline void
669 secpath_put(struct sec_path *sp)
670 {
671 if (sp && atomic_dec_and_test(&sp->refcnt))
672 __secpath_destroy(sp);
673 }
674
675 extern struct sec_path *secpath_dup(struct sec_path *src);
676
677 static inline void
678 secpath_reset(struct sk_buff *skb)
679 {
680 #ifdef CONFIG_XFRM
681 secpath_put(skb->sp);
682 skb->sp = NULL;
683 #endif
684 }
685
686 static inline int
687 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
688 {
689 switch (family) {
690 case AF_INET:
691 return addr->a4 == 0;
692 case AF_INET6:
693 return ipv6_addr_any((struct in6_addr *)&addr->a6);
694 }
695 return 0;
696 }
697
698 static inline int
699 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
700 {
701 return (tmpl->saddr.a4 &&
702 tmpl->saddr.a4 != x->props.saddr.a4);
703 }
704
705 static inline int
706 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
707 {
708 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
709 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
710 }
711
712 static inline int
713 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
714 {
715 switch (family) {
716 case AF_INET:
717 return __xfrm4_state_addr_cmp(tmpl, x);
718 case AF_INET6:
719 return __xfrm6_state_addr_cmp(tmpl, x);
720 }
721 return !0;
722 }
723
724 #ifdef CONFIG_XFRM
725
726 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
727
728 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
729 {
730 if (sk && sk->sk_policy[XFRM_POLICY_IN])
731 return __xfrm_policy_check(sk, dir, skb, family);
732
733 return (!xfrm_policy_count[dir] && !skb->sp) ||
734 (skb->dst->flags & DST_NOPOLICY) ||
735 __xfrm_policy_check(sk, dir, skb, family);
736 }
737
738 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
739 {
740 return xfrm_policy_check(sk, dir, skb, AF_INET);
741 }
742
743 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
744 {
745 return xfrm_policy_check(sk, dir, skb, AF_INET6);
746 }
747
748 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
749 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
750
751 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
752 {
753 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
754 (skb->dst->flags & DST_NOXFRM) ||
755 __xfrm_route_forward(skb, family);
756 }
757
758 static inline int xfrm4_route_forward(struct sk_buff *skb)
759 {
760 return xfrm_route_forward(skb, AF_INET);
761 }
762
763 static inline int xfrm6_route_forward(struct sk_buff *skb)
764 {
765 return xfrm_route_forward(skb, AF_INET6);
766 }
767
768 extern int __xfrm_sk_clone_policy(struct sock *sk);
769
770 static inline int xfrm_sk_clone_policy(struct sock *sk)
771 {
772 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
773 return __xfrm_sk_clone_policy(sk);
774 return 0;
775 }
776
777 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
778
779 static inline void xfrm_sk_free_policy(struct sock *sk)
780 {
781 if (unlikely(sk->sk_policy[0] != NULL)) {
782 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
783 sk->sk_policy[0] = NULL;
784 }
785 if (unlikely(sk->sk_policy[1] != NULL)) {
786 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
787 sk->sk_policy[1] = NULL;
788 }
789 }
790
791 #else
792
793 static inline void xfrm_sk_free_policy(struct sock *sk) {}
794 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
795 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
796 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
797 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
798 {
799 return 1;
800 }
801 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
802 {
803 return 1;
804 }
805 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
806 {
807 return 1;
808 }
809 #endif
810
811 static __inline__
812 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
813 {
814 switch (family){
815 case AF_INET:
816 return (xfrm_address_t *)&fl->fl4_dst;
817 case AF_INET6:
818 return (xfrm_address_t *)&fl->fl6_dst;
819 }
820 return NULL;
821 }
822
823 static __inline__
824 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
825 {
826 switch (family){
827 case AF_INET:
828 return (xfrm_address_t *)&fl->fl4_src;
829 case AF_INET6:
830 return (xfrm_address_t *)&fl->fl6_src;
831 }
832 return NULL;
833 }
834
835 static __inline__ int
836 __xfrm4_state_addr_check(struct xfrm_state *x,
837 xfrm_address_t *daddr, xfrm_address_t *saddr)
838 {
839 if (daddr->a4 == x->id.daddr.a4 &&
840 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
841 return 1;
842 return 0;
843 }
844
845 static __inline__ int
846 __xfrm6_state_addr_check(struct xfrm_state *x,
847 xfrm_address_t *daddr, xfrm_address_t *saddr)
848 {
849 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
850 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
851 ipv6_addr_any((struct in6_addr *)saddr) ||
852 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
853 return 1;
854 return 0;
855 }
856
857 static __inline__ int
858 xfrm_state_addr_check(struct xfrm_state *x,
859 xfrm_address_t *daddr, xfrm_address_t *saddr,
860 unsigned short family)
861 {
862 switch (family) {
863 case AF_INET:
864 return __xfrm4_state_addr_check(x, daddr, saddr);
865 case AF_INET6:
866 return __xfrm6_state_addr_check(x, daddr, saddr);
867 }
868 return 0;
869 }
870
871 static __inline__ int
872 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
873 unsigned short family)
874 {
875 switch (family) {
876 case AF_INET:
877 return __xfrm4_state_addr_check(x,
878 (xfrm_address_t *)&fl->fl4_dst,
879 (xfrm_address_t *)&fl->fl4_src);
880 case AF_INET6:
881 return __xfrm6_state_addr_check(x,
882 (xfrm_address_t *)&fl->fl6_dst,
883 (xfrm_address_t *)&fl->fl6_src);
884 }
885 return 0;
886 }
887
888 static inline int xfrm_state_kern(struct xfrm_state *x)
889 {
890 return atomic_read(&x->tunnel_users);
891 }
892
893 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
894 {
895 return (!userproto || proto == userproto ||
896 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
897 proto == IPPROTO_ESP ||
898 proto == IPPROTO_COMP)));
899 }
900
901 /*
902 * xfrm algorithm information
903 */
904 struct xfrm_algo_auth_info {
905 u16 icv_truncbits;
906 u16 icv_fullbits;
907 };
908
909 struct xfrm_algo_encr_info {
910 u16 blockbits;
911 u16 defkeybits;
912 };
913
914 struct xfrm_algo_comp_info {
915 u16 threshold;
916 };
917
918 struct xfrm_algo_desc {
919 char *name;
920 char *compat;
921 u8 available:1;
922 union {
923 struct xfrm_algo_auth_info auth;
924 struct xfrm_algo_encr_info encr;
925 struct xfrm_algo_comp_info comp;
926 } uinfo;
927 struct sadb_alg desc;
928 };
929
930 /* XFRM tunnel handlers. */
931 struct xfrm_tunnel {
932 int (*handler)(struct sk_buff *skb);
933 int (*err_handler)(struct sk_buff *skb, __u32 info);
934
935 struct xfrm_tunnel *next;
936 int priority;
937 };
938
939 struct xfrm6_tunnel {
940 int (*handler)(struct sk_buff *skb);
941 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
942 int type, int code, int offset, __be32 info);
943 struct xfrm6_tunnel *next;
944 int priority;
945 };
946
947 extern void xfrm_init(void);
948 extern void xfrm4_init(void);
949 extern void xfrm6_init(void);
950 extern void xfrm6_fini(void);
951 extern void xfrm_state_init(void);
952 extern void xfrm4_state_init(void);
953 extern void xfrm6_state_init(void);
954 extern void xfrm6_state_fini(void);
955
956 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
957 extern struct xfrm_state *xfrm_state_alloc(void);
958 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
959 struct flowi *fl, struct xfrm_tmpl *tmpl,
960 struct xfrm_policy *pol, int *err,
961 unsigned short family);
962 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
963 xfrm_address_t *saddr,
964 unsigned short family,
965 u8 mode, u8 proto, u32 reqid);
966 extern int xfrm_state_check_expire(struct xfrm_state *x);
967 extern void xfrm_state_insert(struct xfrm_state *x);
968 extern int xfrm_state_add(struct xfrm_state *x);
969 extern int xfrm_state_update(struct xfrm_state *x);
970 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
971 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
972 #ifdef CONFIG_XFRM_SUB_POLICY
973 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
974 int n, unsigned short family);
975 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
976 int n, unsigned short family);
977 #else
978 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
979 int n, unsigned short family)
980 {
981 return -ENOSYS;
982 }
983
984 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
985 int n, unsigned short family)
986 {
987 return -ENOSYS;
988 }
989 #endif
990
991 struct xfrmk_sadinfo {
992 u32 sadhcnt; /* current hash bkts */
993 u32 sadhmcnt; /* max allowed hash bkts */
994 u32 sadcnt; /* current running count */
995 };
996
997 struct xfrmk_spdinfo {
998 u32 incnt;
999 u32 outcnt;
1000 u32 fwdcnt;
1001 u32 inscnt;
1002 u32 outscnt;
1003 u32 fwdscnt;
1004 u32 spdhcnt;
1005 u32 spdhmcnt;
1006 };
1007
1008 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1009 extern int xfrm_state_delete(struct xfrm_state *x);
1010 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1011 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1012 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1013 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
1014 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1015 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1016 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1017 extern int xfrm_init_state(struct xfrm_state *x);
1018 extern int xfrm_output(struct sk_buff *skb);
1019 extern int xfrm4_rcv(struct sk_buff *skb);
1020 extern int xfrm4_output(struct sk_buff *skb);
1021 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1022 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1023 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi);
1024 extern int xfrm6_rcv(struct sk_buff **pskb);
1025 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1026 xfrm_address_t *saddr, u8 proto);
1027 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1028 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1029 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1030 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1031 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1032 extern int xfrm6_output(struct sk_buff *skb);
1033 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1034 u8 **prevhdr);
1035
1036 #ifdef CONFIG_XFRM
1037 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1038 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1039 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
1040 #else
1041 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1042 {
1043 return -ENOPROTOOPT;
1044 }
1045
1046 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1047 {
1048 /* should not happen */
1049 kfree_skb(skb);
1050 return 0;
1051 }
1052
1053 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
1054 {
1055 return -EINVAL;
1056 }
1057 #endif
1058
1059 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1060 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1061 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1062 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1063 struct xfrm_selector *sel,
1064 struct xfrm_sec_ctx *ctx, int delete,
1065 int *err);
1066 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1067 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1068 u32 xfrm_get_acqseq(void);
1069 void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);
1070 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1071 xfrm_address_t *daddr, xfrm_address_t *saddr,
1072 int create, unsigned short family);
1073 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1074 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1075 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1076 struct flowi *fl, int family, int strict);
1077 extern void xfrm_init_pmtu(struct dst_entry *dst);
1078
1079 #ifdef CONFIG_XFRM_MIGRATE
1080 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1081 struct xfrm_migrate *m, int num_bundles);
1082 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1083 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1084 struct xfrm_migrate *m);
1085 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1086 struct xfrm_migrate *m, int num_bundles);
1087 #endif
1088
1089 extern wait_queue_head_t km_waitq;
1090 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1091 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1092 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1093
1094 extern void xfrm_input_init(void);
1095 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1096
1097 extern void xfrm_probe_algs(void);
1098 extern int xfrm_count_auth_supported(void);
1099 extern int xfrm_count_enc_supported(void);
1100 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1101 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1102 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1103 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1104 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1105 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1106 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1107 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1108
1109 struct hash_desc;
1110 struct scatterlist;
1111 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1112 unsigned int);
1113
1114 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1115 int offset, int len, icv_update_fn_t icv_update);
1116
1117 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1118 int family)
1119 {
1120 switch (family) {
1121 default:
1122 case AF_INET:
1123 return (__force __u32)a->a4 - (__force __u32)b->a4;
1124 case AF_INET6:
1125 return ipv6_addr_cmp((struct in6_addr *)a,
1126 (struct in6_addr *)b);
1127 }
1128 }
1129
1130 static inline int xfrm_policy_id2dir(u32 index)
1131 {
1132 return index & 7;
1133 }
1134
1135 static inline int xfrm_aevent_is_on(void)
1136 {
1137 struct sock *nlsk;
1138 int ret = 0;
1139
1140 rcu_read_lock();
1141 nlsk = rcu_dereference(xfrm_nl);
1142 if (nlsk)
1143 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1144 rcu_read_unlock();
1145 return ret;
1146 }
1147
1148 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1149 {
1150 if (xfrm_aevent_is_on())
1151 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1152 }
1153
1154 #ifdef CONFIG_XFRM_MIGRATE
1155 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1156 {
1157 return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL);
1158 }
1159
1160 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1161 {
1162 int i;
1163 for (i = 0; i < n; i++)
1164 xfrm_state_put(*(states + i));
1165 }
1166
1167 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1168 {
1169 int i;
1170 for (i = 0; i < n; i++)
1171 xfrm_state_delete(*(states + i));
1172 }
1173 #endif
1174
1175 #endif /* _NET_XFRM_H */
Linux kernel - Deliverables
This page took 0.076367 seconds and 6 git commands to generate.