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[IPSEC]: Move output replay code into xfrm_output
[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/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/socket.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/ipsec.h>
12 #include <linux/in6.h>
13 #include <linux/mutex.h>
14 #include <linux/audit.h>
15
16 #include <net/sock.h>
17 #include <net/dst.h>
18 #include <net/ip.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 #define XFRM_TYPE_REPLAY_PROT 2
283
284 int (*init_state)(struct xfrm_state *x);
285 void (*destructor)(struct xfrm_state *);
286 int (*input)(struct xfrm_state *, struct sk_buff *skb);
287 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
288 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
289 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
290 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
291 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
292 /* Estimate maximal size of result of transformation of a dgram */
293 u32 (*get_mtu)(struct xfrm_state *, int size);
294 };
295
296 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
297 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
298 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
299 extern void xfrm_put_type(struct xfrm_type *type);
300
301 struct xfrm_mode {
302 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
303 int (*output)(struct xfrm_state *x,struct sk_buff *skb);
304
305 struct module *owner;
306 unsigned int encap;
307 };
308
309 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
310 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
311 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
312 extern void xfrm_put_mode(struct xfrm_mode *mode);
313
314 struct xfrm_tmpl
315 {
316 /* id in template is interpreted as:
317 * daddr - destination of tunnel, may be zero for transport mode.
318 * spi - zero to acquire spi. Not zero if spi is static, then
319 * daddr must be fixed too.
320 * proto - AH/ESP/IPCOMP
321 */
322 struct xfrm_id id;
323
324 /* Source address of tunnel. Ignored, if it is not a tunnel. */
325 xfrm_address_t saddr;
326
327 unsigned short encap_family;
328
329 __u32 reqid;
330
331 /* Mode: transport, tunnel etc. */
332 __u8 mode;
333
334 /* Sharing mode: unique, this session only, this user only etc. */
335 __u8 share;
336
337 /* May skip this transfomration if no SA is found */
338 __u8 optional;
339
340 /* Bit mask of algos allowed for acquisition */
341 __u32 aalgos;
342 __u32 ealgos;
343 __u32 calgos;
344 };
345
346 #define XFRM_MAX_DEPTH 6
347
348 struct xfrm_policy
349 {
350 struct xfrm_policy *next;
351 struct hlist_node bydst;
352 struct hlist_node byidx;
353
354 /* This lock only affects elements except for entry. */
355 rwlock_t lock;
356 atomic_t refcnt;
357 struct timer_list timer;
358
359 u32 priority;
360 u32 index;
361 struct xfrm_selector selector;
362 struct xfrm_lifetime_cfg lft;
363 struct xfrm_lifetime_cur curlft;
364 struct dst_entry *bundles;
365 u16 family;
366 u8 type;
367 u8 action;
368 u8 flags;
369 u8 dead;
370 u8 xfrm_nr;
371 /* XXX 1 byte hole, try to pack */
372 struct xfrm_sec_ctx *security;
373 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
374 };
375
376 struct xfrm_migrate {
377 xfrm_address_t old_daddr;
378 xfrm_address_t old_saddr;
379 xfrm_address_t new_daddr;
380 xfrm_address_t new_saddr;
381 u8 proto;
382 u8 mode;
383 u16 reserved;
384 u32 reqid;
385 u16 old_family;
386 u16 new_family;
387 };
388
389 #define XFRM_KM_TIMEOUT 30
390 /* which seqno */
391 #define XFRM_REPLAY_SEQ 1
392 #define XFRM_REPLAY_OSEQ 2
393 #define XFRM_REPLAY_SEQ_MASK 3
394 /* what happened */
395 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
396 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
397
398 /* default aevent timeout in units of 100ms */
399 #define XFRM_AE_ETIME 10
400 /* Async Event timer multiplier */
401 #define XFRM_AE_ETH_M 10
402 /* default seq threshold size */
403 #define XFRM_AE_SEQT_SIZE 2
404
405 struct xfrm_mgr
406 {
407 struct list_head list;
408 char *id;
409 int (*notify)(struct xfrm_state *x, struct km_event *c);
410 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
411 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
412 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
413 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
414 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
415 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
416 };
417
418 extern int xfrm_register_km(struct xfrm_mgr *km);
419 extern int xfrm_unregister_km(struct xfrm_mgr *km);
420
421 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
422
423 /*
424 * This structure is used for the duration where packets are being
425 * transformed by IPsec. As soon as the packet leaves IPsec the
426 * area beyond the generic IP part may be overwritten.
427 */
428 struct xfrm_skb_cb {
429 union {
430 struct inet_skb_parm h4;
431 struct inet6_skb_parm h6;
432 } header;
433
434 /* Sequence number for replay protection. */
435 u64 seq;
436 };
437
438 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
439
440 /* Audit Information */
441 struct xfrm_audit
442 {
443 u32 loginuid;
444 u32 secid;
445 };
446
447 #ifdef CONFIG_AUDITSYSCALL
448 static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
449 {
450 struct audit_buffer *audit_buf = NULL;
451 char *secctx;
452 u32 secctx_len;
453
454 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
455 AUDIT_MAC_IPSEC_EVENT);
456 if (audit_buf == NULL)
457 return NULL;
458
459 audit_log_format(audit_buf, "auid=%u", auid);
460
461 if (sid != 0 &&
462 security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {
463 audit_log_format(audit_buf, " subj=%s", secctx);
464 security_release_secctx(secctx, secctx_len);
465 } else
466 audit_log_task_context(audit_buf);
467 return audit_buf;
468 }
469
470 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
471 u32 auid, u32 sid);
472 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
473 u32 auid, u32 sid);
474 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
475 u32 auid, u32 sid);
476 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
477 u32 auid, u32 sid);
478 #else
479 #define xfrm_audit_policy_add(x, r, a, s) do { ; } while (0)
480 #define xfrm_audit_policy_delete(x, r, a, s) do { ; } while (0)
481 #define xfrm_audit_state_add(x, r, a, s) do { ; } while (0)
482 #define xfrm_audit_state_delete(x, r, a, s) do { ; } while (0)
483 #endif /* CONFIG_AUDITSYSCALL */
484
485 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
486 {
487 if (likely(policy != NULL))
488 atomic_inc(&policy->refcnt);
489 }
490
491 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
492
493 static inline void xfrm_pol_put(struct xfrm_policy *policy)
494 {
495 if (atomic_dec_and_test(&policy->refcnt))
496 __xfrm_policy_destroy(policy);
497 }
498
499 #ifdef CONFIG_XFRM_SUB_POLICY
500 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
501 {
502 int i;
503 for (i = npols - 1; i >= 0; --i)
504 xfrm_pol_put(pols[i]);
505 }
506 #else
507 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
508 {
509 xfrm_pol_put(pols[0]);
510 }
511 #endif
512
513 extern void __xfrm_state_destroy(struct xfrm_state *);
514
515 static inline void __xfrm_state_put(struct xfrm_state *x)
516 {
517 atomic_dec(&x->refcnt);
518 }
519
520 static inline void xfrm_state_put(struct xfrm_state *x)
521 {
522 if (atomic_dec_and_test(&x->refcnt))
523 __xfrm_state_destroy(x);
524 }
525
526 static inline void xfrm_state_hold(struct xfrm_state *x)
527 {
528 atomic_inc(&x->refcnt);
529 }
530
531 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
532 {
533 __be32 *a1 = token1;
534 __be32 *a2 = token2;
535 int pdw;
536 int pbi;
537
538 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
539 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
540
541 if (pdw)
542 if (memcmp(a1, a2, pdw << 2))
543 return 0;
544
545 if (pbi) {
546 __be32 mask;
547
548 mask = htonl((0xffffffff) << (32 - pbi));
549
550 if ((a1[pdw] ^ a2[pdw]) & mask)
551 return 0;
552 }
553
554 return 1;
555 }
556
557 static __inline__
558 __be16 xfrm_flowi_sport(struct flowi *fl)
559 {
560 __be16 port;
561 switch(fl->proto) {
562 case IPPROTO_TCP:
563 case IPPROTO_UDP:
564 case IPPROTO_UDPLITE:
565 case IPPROTO_SCTP:
566 port = fl->fl_ip_sport;
567 break;
568 case IPPROTO_ICMP:
569 case IPPROTO_ICMPV6:
570 port = htons(fl->fl_icmp_type);
571 break;
572 case IPPROTO_MH:
573 port = htons(fl->fl_mh_type);
574 break;
575 default:
576 port = 0; /*XXX*/
577 }
578 return port;
579 }
580
581 static __inline__
582 __be16 xfrm_flowi_dport(struct flowi *fl)
583 {
584 __be16 port;
585 switch(fl->proto) {
586 case IPPROTO_TCP:
587 case IPPROTO_UDP:
588 case IPPROTO_UDPLITE:
589 case IPPROTO_SCTP:
590 port = fl->fl_ip_dport;
591 break;
592 case IPPROTO_ICMP:
593 case IPPROTO_ICMPV6:
594 port = htons(fl->fl_icmp_code);
595 break;
596 default:
597 port = 0; /*XXX*/
598 }
599 return port;
600 }
601
602 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
603 unsigned short family);
604
605 #ifdef CONFIG_SECURITY_NETWORK_XFRM
606 /* If neither has a context --> match
607 * Otherwise, both must have a context and the sids, doi, alg must match
608 */
609 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
610 {
611 return ((!s1 && !s2) ||
612 (s1 && s2 &&
613 (s1->ctx_sid == s2->ctx_sid) &&
614 (s1->ctx_doi == s2->ctx_doi) &&
615 (s1->ctx_alg == s2->ctx_alg)));
616 }
617 #else
618 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
619 {
620 return 1;
621 }
622 #endif
623
624 /* A struct encoding bundle of transformations to apply to some set of flow.
625 *
626 * dst->child points to the next element of bundle.
627 * dst->xfrm points to an instanse of transformer.
628 *
629 * Due to unfortunate limitations of current routing cache, which we
630 * have no time to fix, it mirrors struct rtable and bound to the same
631 * routing key, including saddr,daddr. However, we can have many of
632 * bundles differing by session id. All the bundles grow from a parent
633 * policy rule.
634 */
635 struct xfrm_dst
636 {
637 union {
638 struct dst_entry dst;
639 struct rtable rt;
640 struct rt6_info rt6;
641 } u;
642 struct dst_entry *route;
643 #ifdef CONFIG_XFRM_SUB_POLICY
644 struct flowi *origin;
645 struct xfrm_selector *partner;
646 #endif
647 u32 genid;
648 u32 route_mtu_cached;
649 u32 child_mtu_cached;
650 u32 route_cookie;
651 u32 path_cookie;
652 };
653
654 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
655 {
656 dst_release(xdst->route);
657 if (likely(xdst->u.dst.xfrm))
658 xfrm_state_put(xdst->u.dst.xfrm);
659 #ifdef CONFIG_XFRM_SUB_POLICY
660 kfree(xdst->origin);
661 xdst->origin = NULL;
662 kfree(xdst->partner);
663 xdst->partner = NULL;
664 #endif
665 }
666
667 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
668
669 struct sec_path
670 {
671 atomic_t refcnt;
672 int len;
673 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
674 };
675
676 static inline struct sec_path *
677 secpath_get(struct sec_path *sp)
678 {
679 if (sp)
680 atomic_inc(&sp->refcnt);
681 return sp;
682 }
683
684 extern void __secpath_destroy(struct sec_path *sp);
685
686 static inline void
687 secpath_put(struct sec_path *sp)
688 {
689 if (sp && atomic_dec_and_test(&sp->refcnt))
690 __secpath_destroy(sp);
691 }
692
693 extern struct sec_path *secpath_dup(struct sec_path *src);
694
695 static inline void
696 secpath_reset(struct sk_buff *skb)
697 {
698 #ifdef CONFIG_XFRM
699 secpath_put(skb->sp);
700 skb->sp = NULL;
701 #endif
702 }
703
704 static inline int
705 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
706 {
707 switch (family) {
708 case AF_INET:
709 return addr->a4 == 0;
710 case AF_INET6:
711 return ipv6_addr_any((struct in6_addr *)&addr->a6);
712 }
713 return 0;
714 }
715
716 static inline int
717 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
718 {
719 return (tmpl->saddr.a4 &&
720 tmpl->saddr.a4 != x->props.saddr.a4);
721 }
722
723 static inline int
724 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
725 {
726 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
727 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
728 }
729
730 static inline int
731 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
732 {
733 switch (family) {
734 case AF_INET:
735 return __xfrm4_state_addr_cmp(tmpl, x);
736 case AF_INET6:
737 return __xfrm6_state_addr_cmp(tmpl, x);
738 }
739 return !0;
740 }
741
742 #ifdef CONFIG_XFRM
743
744 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
745
746 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
747 {
748 if (sk && sk->sk_policy[XFRM_POLICY_IN])
749 return __xfrm_policy_check(sk, dir, skb, family);
750
751 return (!xfrm_policy_count[dir] && !skb->sp) ||
752 (skb->dst->flags & DST_NOPOLICY) ||
753 __xfrm_policy_check(sk, dir, skb, family);
754 }
755
756 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
757 {
758 return xfrm_policy_check(sk, dir, skb, AF_INET);
759 }
760
761 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
762 {
763 return xfrm_policy_check(sk, dir, skb, AF_INET6);
764 }
765
766 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
767 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
768
769 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
770 {
771 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
772 (skb->dst->flags & DST_NOXFRM) ||
773 __xfrm_route_forward(skb, family);
774 }
775
776 static inline int xfrm4_route_forward(struct sk_buff *skb)
777 {
778 return xfrm_route_forward(skb, AF_INET);
779 }
780
781 static inline int xfrm6_route_forward(struct sk_buff *skb)
782 {
783 return xfrm_route_forward(skb, AF_INET6);
784 }
785
786 extern int __xfrm_sk_clone_policy(struct sock *sk);
787
788 static inline int xfrm_sk_clone_policy(struct sock *sk)
789 {
790 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
791 return __xfrm_sk_clone_policy(sk);
792 return 0;
793 }
794
795 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
796
797 static inline void xfrm_sk_free_policy(struct sock *sk)
798 {
799 if (unlikely(sk->sk_policy[0] != NULL)) {
800 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
801 sk->sk_policy[0] = NULL;
802 }
803 if (unlikely(sk->sk_policy[1] != NULL)) {
804 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
805 sk->sk_policy[1] = NULL;
806 }
807 }
808
809 #else
810
811 static inline void xfrm_sk_free_policy(struct sock *sk) {}
812 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
813 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
814 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
815 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
816 {
817 return 1;
818 }
819 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
820 {
821 return 1;
822 }
823 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
824 {
825 return 1;
826 }
827 #endif
828
829 static __inline__
830 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
831 {
832 switch (family){
833 case AF_INET:
834 return (xfrm_address_t *)&fl->fl4_dst;
835 case AF_INET6:
836 return (xfrm_address_t *)&fl->fl6_dst;
837 }
838 return NULL;
839 }
840
841 static __inline__
842 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
843 {
844 switch (family){
845 case AF_INET:
846 return (xfrm_address_t *)&fl->fl4_src;
847 case AF_INET6:
848 return (xfrm_address_t *)&fl->fl6_src;
849 }
850 return NULL;
851 }
852
853 static __inline__ int
854 __xfrm4_state_addr_check(struct xfrm_state *x,
855 xfrm_address_t *daddr, xfrm_address_t *saddr)
856 {
857 if (daddr->a4 == x->id.daddr.a4 &&
858 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
859 return 1;
860 return 0;
861 }
862
863 static __inline__ int
864 __xfrm6_state_addr_check(struct xfrm_state *x,
865 xfrm_address_t *daddr, xfrm_address_t *saddr)
866 {
867 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
868 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
869 ipv6_addr_any((struct in6_addr *)saddr) ||
870 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
871 return 1;
872 return 0;
873 }
874
875 static __inline__ int
876 xfrm_state_addr_check(struct xfrm_state *x,
877 xfrm_address_t *daddr, xfrm_address_t *saddr,
878 unsigned short family)
879 {
880 switch (family) {
881 case AF_INET:
882 return __xfrm4_state_addr_check(x, daddr, saddr);
883 case AF_INET6:
884 return __xfrm6_state_addr_check(x, daddr, saddr);
885 }
886 return 0;
887 }
888
889 static __inline__ int
890 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
891 unsigned short family)
892 {
893 switch (family) {
894 case AF_INET:
895 return __xfrm4_state_addr_check(x,
896 (xfrm_address_t *)&fl->fl4_dst,
897 (xfrm_address_t *)&fl->fl4_src);
898 case AF_INET6:
899 return __xfrm6_state_addr_check(x,
900 (xfrm_address_t *)&fl->fl6_dst,
901 (xfrm_address_t *)&fl->fl6_src);
902 }
903 return 0;
904 }
905
906 static inline int xfrm_state_kern(struct xfrm_state *x)
907 {
908 return atomic_read(&x->tunnel_users);
909 }
910
911 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
912 {
913 return (!userproto || proto == userproto ||
914 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
915 proto == IPPROTO_ESP ||
916 proto == IPPROTO_COMP)));
917 }
918
919 /*
920 * xfrm algorithm information
921 */
922 struct xfrm_algo_auth_info {
923 u16 icv_truncbits;
924 u16 icv_fullbits;
925 };
926
927 struct xfrm_algo_encr_info {
928 u16 blockbits;
929 u16 defkeybits;
930 };
931
932 struct xfrm_algo_comp_info {
933 u16 threshold;
934 };
935
936 struct xfrm_algo_desc {
937 char *name;
938 char *compat;
939 u8 available:1;
940 union {
941 struct xfrm_algo_auth_info auth;
942 struct xfrm_algo_encr_info encr;
943 struct xfrm_algo_comp_info comp;
944 } uinfo;
945 struct sadb_alg desc;
946 };
947
948 /* XFRM tunnel handlers. */
949 struct xfrm_tunnel {
950 int (*handler)(struct sk_buff *skb);
951 int (*err_handler)(struct sk_buff *skb, __u32 info);
952
953 struct xfrm_tunnel *next;
954 int priority;
955 };
956
957 struct xfrm6_tunnel {
958 int (*handler)(struct sk_buff *skb);
959 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
960 int type, int code, int offset, __be32 info);
961 struct xfrm6_tunnel *next;
962 int priority;
963 };
964
965 extern void xfrm_init(void);
966 extern void xfrm4_init(void);
967 extern void xfrm6_init(void);
968 extern void xfrm6_fini(void);
969 extern void xfrm_state_init(void);
970 extern void xfrm4_state_init(void);
971 extern void xfrm6_state_init(void);
972 extern void xfrm6_state_fini(void);
973
974 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
975 extern struct xfrm_state *xfrm_state_alloc(void);
976 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
977 struct flowi *fl, struct xfrm_tmpl *tmpl,
978 struct xfrm_policy *pol, int *err,
979 unsigned short family);
980 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
981 xfrm_address_t *saddr,
982 unsigned short family,
983 u8 mode, u8 proto, u32 reqid);
984 extern int xfrm_state_check_expire(struct xfrm_state *x);
985 extern void xfrm_state_insert(struct xfrm_state *x);
986 extern int xfrm_state_add(struct xfrm_state *x);
987 extern int xfrm_state_update(struct xfrm_state *x);
988 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
989 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
990 #ifdef CONFIG_XFRM_SUB_POLICY
991 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
992 int n, unsigned short family);
993 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
994 int n, unsigned short family);
995 #else
996 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
997 int n, unsigned short family)
998 {
999 return -ENOSYS;
1000 }
1001
1002 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1003 int n, unsigned short family)
1004 {
1005 return -ENOSYS;
1006 }
1007 #endif
1008
1009 struct xfrmk_sadinfo {
1010 u32 sadhcnt; /* current hash bkts */
1011 u32 sadhmcnt; /* max allowed hash bkts */
1012 u32 sadcnt; /* current running count */
1013 };
1014
1015 struct xfrmk_spdinfo {
1016 u32 incnt;
1017 u32 outcnt;
1018 u32 fwdcnt;
1019 u32 inscnt;
1020 u32 outscnt;
1021 u32 fwdscnt;
1022 u32 spdhcnt;
1023 u32 spdhmcnt;
1024 };
1025
1026 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1027 extern int xfrm_state_delete(struct xfrm_state *x);
1028 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1029 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1030 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1031 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
1032 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1033 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1034 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1035 extern int xfrm_init_state(struct xfrm_state *x);
1036 extern int xfrm_output(struct sk_buff *skb);
1037 extern int xfrm4_rcv(struct sk_buff *skb);
1038 extern int xfrm4_output(struct sk_buff *skb);
1039 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1040 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1041 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi);
1042 extern int xfrm6_rcv(struct sk_buff **pskb);
1043 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1044 xfrm_address_t *saddr, u8 proto);
1045 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1046 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1047 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1048 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1049 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1050 extern int xfrm6_output(struct sk_buff *skb);
1051 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1052 u8 **prevhdr);
1053
1054 #ifdef CONFIG_XFRM
1055 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1056 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1057 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
1058 #else
1059 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1060 {
1061 return -ENOPROTOOPT;
1062 }
1063
1064 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1065 {
1066 /* should not happen */
1067 kfree_skb(skb);
1068 return 0;
1069 }
1070
1071 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
1072 {
1073 return -EINVAL;
1074 }
1075 #endif
1076
1077 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1078 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1079 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1080 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1081 struct xfrm_selector *sel,
1082 struct xfrm_sec_ctx *ctx, int delete,
1083 int *err);
1084 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1085 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1086 u32 xfrm_get_acqseq(void);
1087 void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);
1088 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1089 xfrm_address_t *daddr, xfrm_address_t *saddr,
1090 int create, unsigned short family);
1091 extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1092 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1093 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1094 struct flowi *fl, int family, int strict);
1095 extern void xfrm_init_pmtu(struct dst_entry *dst);
1096
1097 #ifdef CONFIG_XFRM_MIGRATE
1098 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1099 struct xfrm_migrate *m, int num_bundles);
1100 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1101 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1102 struct xfrm_migrate *m);
1103 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1104 struct xfrm_migrate *m, int num_bundles);
1105 #endif
1106
1107 extern wait_queue_head_t km_waitq;
1108 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1109 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1110 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1111
1112 extern void xfrm_input_init(void);
1113 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1114
1115 extern void xfrm_probe_algs(void);
1116 extern int xfrm_count_auth_supported(void);
1117 extern int xfrm_count_enc_supported(void);
1118 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1119 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1120 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1121 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1122 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1123 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1124 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1125 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1126
1127 struct hash_desc;
1128 struct scatterlist;
1129 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1130 unsigned int);
1131
1132 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1133 int offset, int len, icv_update_fn_t icv_update);
1134
1135 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1136 int family)
1137 {
1138 switch (family) {
1139 default:
1140 case AF_INET:
1141 return (__force __u32)a->a4 - (__force __u32)b->a4;
1142 case AF_INET6:
1143 return ipv6_addr_cmp((struct in6_addr *)a,
1144 (struct in6_addr *)b);
1145 }
1146 }
1147
1148 static inline int xfrm_policy_id2dir(u32 index)
1149 {
1150 return index & 7;
1151 }
1152
1153 static inline int xfrm_aevent_is_on(void)
1154 {
1155 struct sock *nlsk;
1156 int ret = 0;
1157
1158 rcu_read_lock();
1159 nlsk = rcu_dereference(xfrm_nl);
1160 if (nlsk)
1161 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1162 rcu_read_unlock();
1163 return ret;
1164 }
1165
1166 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1167 {
1168 if (xfrm_aevent_is_on())
1169 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1170 }
1171
1172 #ifdef CONFIG_XFRM_MIGRATE
1173 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1174 {
1175 return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL);
1176 }
1177
1178 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1179 {
1180 int i;
1181 for (i = 0; i < n; i++)
1182 xfrm_state_put(*(states + i));
1183 }
1184
1185 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1186 {
1187 int i;
1188 for (i = 0; i < n; i++)
1189 xfrm_state_delete(*(states + i));
1190 }
1191 #endif
1192
1193 #endif /* _NET_XFRM_H */
Linux kernel - Deliverables
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