4 #include <linux/compiler.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>
18 #include <net/route.h>
20 #include <net/ip6_fib.h>
22 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
23 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
24 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
26 extern struct sock *xfrm_nl;
27 extern u32 sysctl_xfrm_aevent_etime;
28 extern u32 sysctl_xfrm_aevent_rseqth;
30 extern struct mutex xfrm_cfg_mutex;
32 /* Organization of SPD aka "XFRM rules"
33 ------------------------------------
36 - policy rule, struct xfrm_policy (=SPD entry)
37 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
38 - instance of a transformer, struct xfrm_state (=SA)
39 - template to clone xfrm_state, struct xfrm_tmpl
41 SPD is plain linear list of xfrm_policy rules, ordered by priority.
42 (To be compatible with existing pfkeyv2 implementations,
43 many rules with priority of 0x7fffffff are allowed to exist and
44 such rules are ordered in an unpredictable way, thanks to bsd folks.)
46 Lookup is plain linear search until the first match with selector.
48 If "action" is "block", then we prohibit the flow, otherwise:
49 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
50 policy entry has list of up to XFRM_MAX_DEPTH transformations,
51 described by templates xfrm_tmpl. Each template is resolved
52 to a complete xfrm_state (see below) and we pack bundle of transformations
53 to a dst_entry returned to requestor.
55 dst -. xfrm .-> xfrm_state #1
56 |---. child .-> dst -. xfrm .-> xfrm_state #2
57 |---. child .-> dst -. xfrm .-> xfrm_state #3
60 Bundles are cached at xrfm_policy struct (field ->bundles).
63 Resolution of xrfm_tmpl
64 -----------------------
66 1. ->mode Mode: transport or tunnel
67 2. ->id.proto Protocol: AH/ESP/IPCOMP
68 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
69 Q: allow to resolve security gateway?
70 4. ->id.spi If not zero, static SPI.
71 5. ->saddr Local tunnel endpoint, ignored for transport mode.
72 6. ->algos List of allowed algos. Plain bitmask now.
73 Q: ealgos, aalgos, calgos. What a mess...
74 7. ->share Sharing mode.
75 Q: how to implement private sharing mode? To add struct sock* to
78 Having this template we search through SAD searching for entries
79 with appropriate mode/proto/algo, permitted by selector.
80 If no appropriate entry found, it is requested from key manager.
83 Q: How to find all the bundles referring to a physical path for
84 PMTU discovery? Seems, dst should contain list of all parents...
85 and enter to infinite locking hierarchy disaster.
86 No! It is easier, we will not search for them, let them find us.
87 We add genid to each dst plus pointer to genid of raw IP route,
88 pmtu disc will update pmtu on raw IP route and increase its genid.
89 dst_check() will see this for top level and trigger resyncing
90 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
93 /* Full description of state of transformer. */
96 /* Note: bydst is re-used during gc */
97 struct hlist_node bydst;
98 struct hlist_node bysrc;
99 struct hlist_node byspi;
105 struct xfrm_selector sel;
109 /* Key manger bits */
116 /* Parameters of this state. */
121 u8 aalgo, ealgo, calgo;
124 xfrm_address_t saddr;
129 struct xfrm_lifetime_cfg lft;
131 /* Data for transformer */
132 struct xfrm_algo *aalg;
133 struct xfrm_algo *ealg;
134 struct xfrm_algo *calg;
136 /* Data for encapsulator */
137 struct xfrm_encap_tmpl *encap;
139 /* Data for care-of address */
140 xfrm_address_t *coaddr;
142 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
143 struct xfrm_state *tunnel;
145 /* If a tunnel, number of users + 1 */
146 atomic_t tunnel_users;
148 /* State for replay detection */
149 struct xfrm_replay_state replay;
151 /* Replay detection state at the time we sent the last notification */
152 struct xfrm_replay_state preplay;
154 /* internal flag that only holds state for delayed aevent at the
159 /* Replay detection notification settings */
163 /* Replay detection notification timer */
164 struct timer_list rtimer;
167 struct xfrm_stats stats;
169 struct xfrm_lifetime_cur curlft;
170 struct timer_list timer;
175 /* Reference to data common to all the instances of this
177 struct xfrm_type *type;
178 struct xfrm_mode *mode;
180 /* Security context */
181 struct xfrm_sec_ctx *security;
183 /* Private data of this transformer, format is opaque,
184 * interpreted by xfrm_type methods. */
188 /* xflags - make enum if more show up */
189 #define XFRM_TIME_DEFER 1
200 /* callback structure passed from either netlink or pfkey */
218 struct xfrm_policy_afinfo {
219 unsigned short family;
220 struct xfrm_type *type_map[IPPROTO_MAX];
221 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
222 struct dst_ops *dst_ops;
223 void (*garbage_collect)(void);
224 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
225 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
226 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
227 int (*bundle_create)(struct xfrm_policy *policy,
228 struct xfrm_state **xfrm,
231 struct dst_entry **dst_p);
232 void (*decode_session)(struct sk_buff *skb,
236 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
237 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
238 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
239 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
240 #define XFRM_ACQ_EXPIRES 30
243 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
244 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
245 extern int __xfrm_state_delete(struct xfrm_state *x);
247 struct xfrm_state_afinfo {
248 unsigned short family;
249 int (*init_flags)(struct xfrm_state *x);
250 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
251 struct xfrm_tmpl *tmpl,
252 xfrm_address_t *daddr, xfrm_address_t *saddr);
253 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
254 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
257 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
258 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
260 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
265 struct module *owner;
268 #define XFRM_TYPE_NON_FRAGMENT 1
270 int (*init_state)(struct xfrm_state *x);
271 void (*destructor)(struct xfrm_state *);
272 int (*input)(struct xfrm_state *, struct sk_buff *skb);
273 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
274 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
275 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
276 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
277 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
278 /* Estimate maximal size of result of transformation of a dgram */
279 u32 (*get_max_size)(struct xfrm_state *, int size);
282 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
283 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
284 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
285 extern void xfrm_put_type(struct xfrm_type *type);
288 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
289 int (*output)(struct xfrm_state *x,struct sk_buff *skb);
291 struct module *owner;
295 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
296 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
297 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
298 extern void xfrm_put_mode(struct xfrm_mode *mode);
302 /* id in template is interpreted as:
303 * daddr - destination of tunnel, may be zero for transport mode.
304 * spi - zero to acquire spi. Not zero if spi is static, then
305 * daddr must be fixed too.
306 * proto - AH/ESP/IPCOMP
310 /* Source address of tunnel. Ignored, if it is not a tunnel. */
311 xfrm_address_t saddr;
313 unsigned short encap_family;
317 /* Mode: transport, tunnel etc. */
320 /* Sharing mode: unique, this session only, this user only etc. */
323 /* May skip this transfomration if no SA is found */
326 /* Bit mask of algos allowed for acquisition */
332 #define XFRM_MAX_DEPTH 6
336 struct xfrm_policy *next;
337 struct hlist_node bydst;
338 struct hlist_node byidx;
340 /* This lock only affects elements except for entry. */
343 struct timer_list timer;
347 struct xfrm_selector selector;
348 struct xfrm_lifetime_cfg lft;
349 struct xfrm_lifetime_cur curlft;
350 struct dst_entry *bundles;
357 /* XXX 1 byte hole, try to pack */
358 struct xfrm_sec_ctx *security;
359 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
362 #define XFRM_KM_TIMEOUT 30
364 #define XFRM_REPLAY_SEQ 1
365 #define XFRM_REPLAY_OSEQ 2
366 #define XFRM_REPLAY_SEQ_MASK 3
368 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
369 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
371 /* default aevent timeout in units of 100ms */
372 #define XFRM_AE_ETIME 10
373 /* Async Event timer multiplier */
374 #define XFRM_AE_ETH_M 10
375 /* default seq threshold size */
376 #define XFRM_AE_SEQT_SIZE 2
380 struct list_head list;
382 int (*notify)(struct xfrm_state *x, struct km_event *c);
383 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
384 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
385 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
386 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
387 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
390 extern int xfrm_register_km(struct xfrm_mgr *km);
391 extern int xfrm_unregister_km(struct xfrm_mgr *km);
393 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
395 /* Audit Information */
401 void xfrm_audit_log(uid_t auid, u32 secid, int type, int result,
402 struct xfrm_policy *xp, struct xfrm_state *x);
404 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
406 if (likely(policy != NULL))
407 atomic_inc(&policy->refcnt);
410 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
412 static inline void xfrm_pol_put(struct xfrm_policy *policy)
414 if (atomic_dec_and_test(&policy->refcnt))
415 __xfrm_policy_destroy(policy);
418 #ifdef CONFIG_XFRM_SUB_POLICY
419 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
422 for (i = npols - 1; i >= 0; --i)
423 xfrm_pol_put(pols[i]);
426 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
428 xfrm_pol_put(pols[0]);
432 extern void __xfrm_state_destroy(struct xfrm_state *);
434 static inline void __xfrm_state_put(struct xfrm_state *x)
436 atomic_dec(&x->refcnt);
439 static inline void xfrm_state_put(struct xfrm_state *x)
441 if (atomic_dec_and_test(&x->refcnt))
442 __xfrm_state_destroy(x);
445 static inline void xfrm_state_hold(struct xfrm_state *x)
447 atomic_inc(&x->refcnt);
450 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
457 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
458 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
461 if (memcmp(a1, a2, pdw << 2))
467 mask = htonl((0xffffffff) << (32 - pbi));
469 if ((a1[pdw] ^ a2[pdw]) & mask)
477 __be16 xfrm_flowi_sport(struct flowi *fl)
483 case IPPROTO_UDPLITE:
485 port = fl->fl_ip_sport;
489 port = htons(fl->fl_icmp_type);
491 #ifdef CONFIG_IPV6_MIP6
493 port = htons(fl->fl_mh_type);
503 __be16 xfrm_flowi_dport(struct flowi *fl)
509 case IPPROTO_UDPLITE:
511 port = fl->fl_ip_dport;
515 port = htons(fl->fl_icmp_code);
523 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
524 unsigned short family);
526 #ifdef CONFIG_SECURITY_NETWORK_XFRM
527 /* If neither has a context --> match
528 * Otherwise, both must have a context and the sids, doi, alg must match
530 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
532 return ((!s1 && !s2) ||
534 (s1->ctx_sid == s2->ctx_sid) &&
535 (s1->ctx_doi == s2->ctx_doi) &&
536 (s1->ctx_alg == s2->ctx_alg)));
539 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
545 /* A struct encoding bundle of transformations to apply to some set of flow.
547 * dst->child points to the next element of bundle.
548 * dst->xfrm points to an instanse of transformer.
550 * Due to unfortunate limitations of current routing cache, which we
551 * have no time to fix, it mirrors struct rtable and bound to the same
552 * routing key, including saddr,daddr. However, we can have many of
553 * bundles differing by session id. All the bundles grow from a parent
559 struct xfrm_dst *next;
560 struct dst_entry dst;
564 struct dst_entry *route;
566 u32 route_mtu_cached;
567 u32 child_mtu_cached;
572 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
574 dst_release(xdst->route);
575 if (likely(xdst->u.dst.xfrm))
576 xfrm_state_put(xdst->u.dst.xfrm);
579 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
585 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
588 static inline struct sec_path *
589 secpath_get(struct sec_path *sp)
592 atomic_inc(&sp->refcnt);
596 extern void __secpath_destroy(struct sec_path *sp);
599 secpath_put(struct sec_path *sp)
601 if (sp && atomic_dec_and_test(&sp->refcnt))
602 __secpath_destroy(sp);
605 extern struct sec_path *secpath_dup(struct sec_path *src);
608 secpath_reset(struct sk_buff *skb)
611 secpath_put(skb->sp);
617 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
621 return addr->a4 == 0;
623 return ipv6_addr_any((struct in6_addr *)&addr->a6);
629 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
631 return (tmpl->saddr.a4 &&
632 tmpl->saddr.a4 != x->props.saddr.a4);
636 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
638 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
639 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
643 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
647 return __xfrm4_state_addr_cmp(tmpl, x);
649 return __xfrm6_state_addr_cmp(tmpl, x);
656 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
658 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
660 if (sk && sk->sk_policy[XFRM_POLICY_IN])
661 return __xfrm_policy_check(sk, dir, skb, family);
663 return (!xfrm_policy_count[dir] && !skb->sp) ||
664 (skb->dst->flags & DST_NOPOLICY) ||
665 __xfrm_policy_check(sk, dir, skb, family);
668 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
670 return xfrm_policy_check(sk, dir, skb, AF_INET);
673 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
675 return xfrm_policy_check(sk, dir, skb, AF_INET6);
678 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
679 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
681 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
683 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
684 (skb->dst->flags & DST_NOXFRM) ||
685 __xfrm_route_forward(skb, family);
688 static inline int xfrm4_route_forward(struct sk_buff *skb)
690 return xfrm_route_forward(skb, AF_INET);
693 static inline int xfrm6_route_forward(struct sk_buff *skb)
695 return xfrm_route_forward(skb, AF_INET6);
698 extern int __xfrm_sk_clone_policy(struct sock *sk);
700 static inline int xfrm_sk_clone_policy(struct sock *sk)
702 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
703 return __xfrm_sk_clone_policy(sk);
707 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
709 static inline void xfrm_sk_free_policy(struct sock *sk)
711 if (unlikely(sk->sk_policy[0] != NULL)) {
712 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
713 sk->sk_policy[0] = NULL;
715 if (unlikely(sk->sk_policy[1] != NULL)) {
716 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
717 sk->sk_policy[1] = NULL;
723 static inline void xfrm_sk_free_policy(struct sock *sk) {}
724 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
725 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
726 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
727 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
731 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
735 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
742 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
746 return (xfrm_address_t *)&fl->fl4_dst;
748 return (xfrm_address_t *)&fl->fl6_dst;
754 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
758 return (xfrm_address_t *)&fl->fl4_src;
760 return (xfrm_address_t *)&fl->fl6_src;
765 static __inline__ int
766 __xfrm4_state_addr_check(struct xfrm_state *x,
767 xfrm_address_t *daddr, xfrm_address_t *saddr)
769 if (daddr->a4 == x->id.daddr.a4 &&
770 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
775 static __inline__ int
776 __xfrm6_state_addr_check(struct xfrm_state *x,
777 xfrm_address_t *daddr, xfrm_address_t *saddr)
779 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
780 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
781 ipv6_addr_any((struct in6_addr *)saddr) ||
782 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
787 static __inline__ int
788 xfrm_state_addr_check(struct xfrm_state *x,
789 xfrm_address_t *daddr, xfrm_address_t *saddr,
790 unsigned short family)
794 return __xfrm4_state_addr_check(x, daddr, saddr);
796 return __xfrm6_state_addr_check(x, daddr, saddr);
801 static __inline__ int
802 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
803 unsigned short family)
807 return __xfrm4_state_addr_check(x,
808 (xfrm_address_t *)&fl->fl4_dst,
809 (xfrm_address_t *)&fl->fl4_src);
811 return __xfrm6_state_addr_check(x,
812 (xfrm_address_t *)&fl->fl6_dst,
813 (xfrm_address_t *)&fl->fl6_src);
818 static inline int xfrm_state_kern(struct xfrm_state *x)
820 return atomic_read(&x->tunnel_users);
823 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
825 return (!userproto || proto == userproto ||
826 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
827 proto == IPPROTO_ESP ||
828 proto == IPPROTO_COMP)));
832 * xfrm algorithm information
834 struct xfrm_algo_auth_info {
839 struct xfrm_algo_encr_info {
844 struct xfrm_algo_comp_info {
848 struct xfrm_algo_desc {
853 struct xfrm_algo_auth_info auth;
854 struct xfrm_algo_encr_info encr;
855 struct xfrm_algo_comp_info comp;
857 struct sadb_alg desc;
860 /* XFRM tunnel handlers. */
862 int (*handler)(struct sk_buff *skb);
863 int (*err_handler)(struct sk_buff *skb, __u32 info);
865 struct xfrm_tunnel *next;
869 struct xfrm6_tunnel {
870 int (*handler)(struct sk_buff *skb);
871 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
872 int type, int code, int offset, __be32 info);
873 struct xfrm6_tunnel *next;
877 extern void xfrm_init(void);
878 extern void xfrm4_init(void);
879 extern void xfrm6_init(void);
880 extern void xfrm6_fini(void);
881 extern void xfrm_state_init(void);
882 extern void xfrm4_state_init(void);
883 extern void xfrm6_state_init(void);
884 extern void xfrm6_state_fini(void);
886 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
887 extern struct xfrm_state *xfrm_state_alloc(void);
888 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
889 struct flowi *fl, struct xfrm_tmpl *tmpl,
890 struct xfrm_policy *pol, int *err,
891 unsigned short family);
892 extern int xfrm_state_check_expire(struct xfrm_state *x);
893 extern void xfrm_state_insert(struct xfrm_state *x);
894 extern int xfrm_state_add(struct xfrm_state *x);
895 extern int xfrm_state_update(struct xfrm_state *x);
896 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
897 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
898 #ifdef CONFIG_XFRM_SUB_POLICY
899 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
900 int n, unsigned short family);
901 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
902 int n, unsigned short family);
904 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
905 int n, unsigned short family)
910 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
911 int n, unsigned short family)
916 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
917 extern int xfrm_state_delete(struct xfrm_state *x);
918 extern void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
919 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
920 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
921 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
922 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
923 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
924 extern int xfrm_init_state(struct xfrm_state *x);
925 extern int xfrm4_rcv(struct sk_buff *skb);
926 extern int xfrm4_output(struct sk_buff *skb);
927 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
928 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
929 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi);
930 extern int xfrm6_rcv(struct sk_buff **pskb);
931 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
932 xfrm_address_t *saddr, u8 proto);
933 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
934 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
935 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
936 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
937 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
938 extern int xfrm6_output(struct sk_buff *skb);
939 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
943 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
944 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
945 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
947 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
952 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
954 /* should not happen */
958 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
964 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
965 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
966 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
967 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
968 struct xfrm_selector *sel,
969 struct xfrm_sec_ctx *ctx, int delete);
970 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete);
971 void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
972 u32 xfrm_get_acqseq(void);
973 void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);
974 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
975 xfrm_address_t *daddr, xfrm_address_t *saddr,
976 int create, unsigned short family);
977 extern void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
978 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
979 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
980 struct flowi *fl, int family, int strict);
981 extern void xfrm_init_pmtu(struct dst_entry *dst);
983 extern wait_queue_head_t km_waitq;
984 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
985 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
986 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
988 extern void xfrm_input_init(void);
989 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
991 extern void xfrm_probe_algs(void);
992 extern int xfrm_count_auth_supported(void);
993 extern int xfrm_count_enc_supported(void);
994 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
995 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
996 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
997 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
998 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
999 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1000 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1001 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1005 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1008 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1009 int offset, int len, icv_update_fn_t icv_update);
1011 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1017 return (__force __u32)a->a4 - (__force __u32)b->a4;
1019 return ipv6_addr_cmp((struct in6_addr *)a,
1020 (struct in6_addr *)b);
1024 static inline int xfrm_policy_id2dir(u32 index)
1029 static inline int xfrm_aevent_is_on(void)
1035 nlsk = rcu_dereference(xfrm_nl);
1037 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1042 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1044 if (xfrm_aevent_is_on())
1045 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1049 #endif /* _NET_XFRM_H */