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/crypto.h>
12 #include <linux/pfkeyv2.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)
24 extern struct sock *xfrm_nl;
25 extern u32 sysctl_xfrm_aevent_etime;
26 extern u32 sysctl_xfrm_aevent_rseqth;
28 extern struct mutex xfrm_cfg_mutex;
30 /* Organization of SPD aka "XFRM rules"
31 ------------------------------------
34 - policy rule, struct xfrm_policy (=SPD entry)
35 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
36 - instance of a transformer, struct xfrm_state (=SA)
37 - template to clone xfrm_state, struct xfrm_tmpl
39 SPD is plain linear list of xfrm_policy rules, ordered by priority.
40 (To be compatible with existing pfkeyv2 implementations,
41 many rules with priority of 0x7fffffff are allowed to exist and
42 such rules are ordered in an unpredictable way, thanks to bsd folks.)
44 Lookup is plain linear search until the first match with selector.
46 If "action" is "block", then we prohibit the flow, otherwise:
47 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
48 policy entry has list of up to XFRM_MAX_DEPTH transformations,
49 described by templates xfrm_tmpl. Each template is resolved
50 to a complete xfrm_state (see below) and we pack bundle of transformations
51 to a dst_entry returned to requestor.
53 dst -. xfrm .-> xfrm_state #1
54 |---. child .-> dst -. xfrm .-> xfrm_state #2
55 |---. child .-> dst -. xfrm .-> xfrm_state #3
58 Bundles are cached at xrfm_policy struct (field ->bundles).
61 Resolution of xrfm_tmpl
62 -----------------------
64 1. ->mode Mode: transport or tunnel
65 2. ->id.proto Protocol: AH/ESP/IPCOMP
66 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
67 Q: allow to resolve security gateway?
68 4. ->id.spi If not zero, static SPI.
69 5. ->saddr Local tunnel endpoint, ignored for transport mode.
70 6. ->algos List of allowed algos. Plain bitmask now.
71 Q: ealgos, aalgos, calgos. What a mess...
72 7. ->share Sharing mode.
73 Q: how to implement private sharing mode? To add struct sock* to
76 Having this template we search through SAD searching for entries
77 with appropriate mode/proto/algo, permitted by selector.
78 If no appropriate entry found, it is requested from key manager.
81 Q: How to find all the bundles referring to a physical path for
82 PMTU discovery? Seems, dst should contain list of all parents...
83 and enter to infinite locking hierarchy disaster.
84 No! It is easier, we will not search for them, let them find us.
85 We add genid to each dst plus pointer to genid of raw IP route,
86 pmtu disc will update pmtu on raw IP route and increase its genid.
87 dst_check() will see this for top level and trigger resyncing
88 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
91 /* Full description of state of transformer. */
94 /* Note: bydst is re-used during gc */
95 struct list_head bydst;
96 struct list_head byspi;
102 struct xfrm_selector sel;
104 /* Key manger bits */
111 /* Parameters of this state. */
116 u8 aalgo, ealgo, calgo;
119 xfrm_address_t saddr;
124 struct xfrm_lifetime_cfg lft;
126 /* Data for transformer */
127 struct xfrm_algo *aalg;
128 struct xfrm_algo *ealg;
129 struct xfrm_algo *calg;
131 /* Data for encapsulator */
132 struct xfrm_encap_tmpl *encap;
134 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
135 struct xfrm_state *tunnel;
137 /* If a tunnel, number of users + 1 */
138 atomic_t tunnel_users;
140 /* State for replay detection */
141 struct xfrm_replay_state replay;
143 /* Replay detection state at the time we sent the last notification */
144 struct xfrm_replay_state preplay;
146 /* Replay detection notification settings */
150 /* Replay detection notification timer */
151 struct timer_list rtimer;
154 struct xfrm_stats stats;
156 struct xfrm_lifetime_cur curlft;
157 struct timer_list timer;
159 /* Reference to data common to all the instances of this
161 struct xfrm_type *type;
163 /* Security context */
164 struct xfrm_sec_ctx *security;
166 /* Private data of this transformer, format is opaque,
167 * interpreted by xfrm_type methods. */
180 /* callback structure passed from either netlink or pfkey */
197 struct xfrm_policy_afinfo {
198 unsigned short family;
200 struct xfrm_type_map *type_map;
201 struct dst_ops *dst_ops;
202 void (*garbage_collect)(void);
203 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
204 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
205 int (*bundle_create)(struct xfrm_policy *policy,
206 struct xfrm_state **xfrm,
209 struct dst_entry **dst_p);
210 void (*decode_session)(struct sk_buff *skb,
214 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
215 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
216 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
217 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
218 #define XFRM_ACQ_EXPIRES 30
221 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
222 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
223 extern int __xfrm_state_delete(struct xfrm_state *x);
225 struct xfrm_state_afinfo {
226 unsigned short family;
228 struct list_head *state_bydst;
229 struct list_head *state_byspi;
230 int (*init_flags)(struct xfrm_state *x);
231 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
232 struct xfrm_tmpl *tmpl,
233 xfrm_address_t *daddr, xfrm_address_t *saddr);
234 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
235 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
236 xfrm_address_t *daddr, xfrm_address_t *saddr,
240 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
241 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
243 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
248 struct module *owner;
251 int (*init_state)(struct xfrm_state *x);
252 void (*destructor)(struct xfrm_state *);
253 int (*input)(struct xfrm_state *, struct sk_buff *skb);
254 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
255 /* Estimate maximal size of result of transformation of a dgram */
256 u32 (*get_max_size)(struct xfrm_state *, int size);
259 struct xfrm_type_map {
261 struct xfrm_type *map[256];
264 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
265 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
266 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
267 extern void xfrm_put_type(struct xfrm_type *type);
271 /* id in template is interpreted as:
272 * daddr - destination of tunnel, may be zero for transport mode.
273 * spi - zero to acquire spi. Not zero if spi is static, then
274 * daddr must be fixed too.
275 * proto - AH/ESP/IPCOMP
279 /* Source address of tunnel. Ignored, if it is not a tunnel. */
280 xfrm_address_t saddr;
284 /* Mode: transport/tunnel */
287 /* Sharing mode: unique, this session only, this user only etc. */
290 /* May skip this transfomration if no SA is found */
293 /* Bit mask of algos allowed for acquisition */
299 #define XFRM_MAX_DEPTH 4
303 struct xfrm_policy *next;
304 struct list_head list;
306 /* This lock only affects elements except for entry. */
309 struct timer_list timer;
313 struct xfrm_selector selector;
314 struct xfrm_lifetime_cfg lft;
315 struct xfrm_lifetime_cur curlft;
316 struct dst_entry *bundles;
322 struct xfrm_sec_ctx *security;
323 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
326 #define XFRM_KM_TIMEOUT 30
328 #define XFRM_REPLAY_SEQ 1
329 #define XFRM_REPLAY_OSEQ 2
330 #define XFRM_REPLAY_SEQ_MASK 3
332 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
333 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
335 /* default aevent timeout in units of 100ms */
336 #define XFRM_AE_ETIME 10
337 /* Async Event timer multiplier */
338 #define XFRM_AE_ETH_M 10
339 /* default seq threshold size */
340 #define XFRM_AE_SEQT_SIZE 2
344 struct list_head list;
346 int (*notify)(struct xfrm_state *x, struct km_event *c);
347 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
348 struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
349 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
350 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
353 extern int xfrm_register_km(struct xfrm_mgr *km);
354 extern int xfrm_unregister_km(struct xfrm_mgr *km);
357 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
359 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
361 if (likely(policy != NULL))
362 atomic_inc(&policy->refcnt);
365 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
367 static inline void xfrm_pol_put(struct xfrm_policy *policy)
369 if (atomic_dec_and_test(&policy->refcnt))
370 __xfrm_policy_destroy(policy);
373 #define XFRM_DST_HSIZE 1024
376 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
380 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
385 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
388 h = ntohl(addr->a6[2]^addr->a6[3]);
389 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
394 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
398 return __xfrm4_dst_hash(addr);
400 return __xfrm6_dst_hash(addr);
406 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
409 h = ntohl(addr->a4^spi^proto);
410 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
415 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
418 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
419 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
424 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
428 return __xfrm4_spi_hash(addr, spi, proto);
430 return __xfrm6_spi_hash(addr, spi, proto);
435 extern void __xfrm_state_destroy(struct xfrm_state *);
437 static inline void __xfrm_state_put(struct xfrm_state *x)
439 atomic_dec(&x->refcnt);
442 static inline void xfrm_state_put(struct xfrm_state *x)
444 if (atomic_dec_and_test(&x->refcnt))
445 __xfrm_state_destroy(x);
448 static inline void xfrm_state_hold(struct xfrm_state *x)
450 atomic_inc(&x->refcnt);
453 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
460 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
461 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
464 if (memcmp(a1, a2, pdw << 2))
470 mask = htonl((0xffffffff) << (32 - pbi));
472 if ((a1[pdw] ^ a2[pdw]) & mask)
480 u16 xfrm_flowi_sport(struct flowi *fl)
487 port = fl->fl_ip_sport;
491 port = htons(fl->fl_icmp_type);
500 u16 xfrm_flowi_dport(struct flowi *fl)
507 port = fl->fl_ip_dport;
511 port = htons(fl->fl_icmp_code);
520 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
522 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
523 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
524 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
525 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
526 (fl->proto == sel->proto || !sel->proto) &&
527 (fl->oif == sel->ifindex || !sel->ifindex);
531 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
533 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
534 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
535 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
536 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
537 (fl->proto == sel->proto || !sel->proto) &&
538 (fl->oif == sel->ifindex || !sel->ifindex);
542 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
543 unsigned short family)
547 return __xfrm4_selector_match(sel, fl);
549 return __xfrm6_selector_match(sel, fl);
554 #ifdef CONFIG_SECURITY_NETWORK_XFRM
555 /* If neither has a context --> match
556 * Otherwise, both must have a context and the sids, doi, alg must match
558 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
560 return ((!s1 && !s2) ||
562 (s1->ctx_sid == s2->ctx_sid) &&
563 (s1->ctx_doi == s2->ctx_doi) &&
564 (s1->ctx_alg == s2->ctx_alg)));
567 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
573 /* A struct encoding bundle of transformations to apply to some set of flow.
575 * dst->child points to the next element of bundle.
576 * dst->xfrm points to an instanse of transformer.
578 * Due to unfortunate limitations of current routing cache, which we
579 * have no time to fix, it mirrors struct rtable and bound to the same
580 * routing key, including saddr,daddr. However, we can have many of
581 * bundles differing by session id. All the bundles grow from a parent
587 struct xfrm_dst *next;
588 struct dst_entry dst;
592 struct dst_entry *route;
593 u32 route_mtu_cached;
594 u32 child_mtu_cached;
599 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
601 dst_release(xdst->route);
602 if (likely(xdst->u.dst.xfrm))
603 xfrm_state_put(xdst->u.dst.xfrm);
606 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
612 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
615 static inline struct sec_path *
616 secpath_get(struct sec_path *sp)
619 atomic_inc(&sp->refcnt);
623 extern void __secpath_destroy(struct sec_path *sp);
626 secpath_put(struct sec_path *sp)
628 if (sp && atomic_dec_and_test(&sp->refcnt))
629 __secpath_destroy(sp);
632 extern struct sec_path *secpath_dup(struct sec_path *src);
635 secpath_reset(struct sk_buff *skb)
638 secpath_put(skb->sp);
644 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
646 return (tmpl->saddr.a4 &&
647 tmpl->saddr.a4 != x->props.saddr.a4);
651 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
653 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
654 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
658 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
662 return __xfrm4_state_addr_cmp(tmpl, x);
664 return __xfrm6_state_addr_cmp(tmpl, x);
671 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
673 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
675 if (sk && sk->sk_policy[XFRM_POLICY_IN])
676 return __xfrm_policy_check(sk, dir, skb, family);
678 return (!xfrm_policy_list[dir] && !skb->sp) ||
679 (skb->dst->flags & DST_NOPOLICY) ||
680 __xfrm_policy_check(sk, dir, skb, family);
683 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
685 return xfrm_policy_check(sk, dir, skb, AF_INET);
688 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
690 return xfrm_policy_check(sk, dir, skb, AF_INET6);
693 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
694 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
696 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
698 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
699 (skb->dst->flags & DST_NOXFRM) ||
700 __xfrm_route_forward(skb, family);
703 static inline int xfrm4_route_forward(struct sk_buff *skb)
705 return xfrm_route_forward(skb, AF_INET);
708 static inline int xfrm6_route_forward(struct sk_buff *skb)
710 return xfrm_route_forward(skb, AF_INET6);
713 extern int __xfrm_sk_clone_policy(struct sock *sk);
715 static inline int xfrm_sk_clone_policy(struct sock *sk)
717 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
718 return __xfrm_sk_clone_policy(sk);
722 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
724 static inline void xfrm_sk_free_policy(struct sock *sk)
726 if (unlikely(sk->sk_policy[0] != NULL)) {
727 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
728 sk->sk_policy[0] = NULL;
730 if (unlikely(sk->sk_policy[1] != NULL)) {
731 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
732 sk->sk_policy[1] = NULL;
738 static inline void xfrm_sk_free_policy(struct sock *sk) {}
739 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
740 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
741 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
742 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
746 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
750 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
757 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
761 return (xfrm_address_t *)&fl->fl4_dst;
763 return (xfrm_address_t *)&fl->fl6_dst;
769 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
773 return (xfrm_address_t *)&fl->fl4_src;
775 return (xfrm_address_t *)&fl->fl6_src;
780 static __inline__ int
781 __xfrm4_state_addr_check(struct xfrm_state *x,
782 xfrm_address_t *daddr, xfrm_address_t *saddr)
784 if (daddr->a4 == x->id.daddr.a4 &&
785 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
790 static __inline__ int
791 __xfrm6_state_addr_check(struct xfrm_state *x,
792 xfrm_address_t *daddr, xfrm_address_t *saddr)
794 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
795 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
796 ipv6_addr_any((struct in6_addr *)saddr) ||
797 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
802 static __inline__ int
803 xfrm_state_addr_check(struct xfrm_state *x,
804 xfrm_address_t *daddr, xfrm_address_t *saddr,
805 unsigned short family)
809 return __xfrm4_state_addr_check(x, daddr, saddr);
811 return __xfrm6_state_addr_check(x, daddr, saddr);
816 static inline int xfrm_state_kern(struct xfrm_state *x)
818 return atomic_read(&x->tunnel_users);
822 * xfrm algorithm information
824 struct xfrm_algo_auth_info {
829 struct xfrm_algo_encr_info {
834 struct xfrm_algo_comp_info {
838 struct xfrm_algo_desc {
842 struct xfrm_algo_auth_info auth;
843 struct xfrm_algo_encr_info encr;
844 struct xfrm_algo_comp_info comp;
846 struct sadb_alg desc;
849 /* XFRM tunnel handlers. */
851 int (*handler)(struct sk_buff *skb);
852 int (*err_handler)(struct sk_buff *skb, __u32 info);
854 struct xfrm_tunnel *next;
858 struct xfrm6_tunnel {
859 int (*handler)(struct sk_buff *skb);
860 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
861 int type, int code, int offset, __u32 info);
863 struct xfrm6_tunnel *next;
867 extern void xfrm_init(void);
868 extern void xfrm4_init(void);
869 extern void xfrm6_init(void);
870 extern void xfrm6_fini(void);
871 extern void xfrm_state_init(void);
872 extern void xfrm4_state_init(void);
873 extern void xfrm6_state_init(void);
874 extern void xfrm6_state_fini(void);
876 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
877 extern struct xfrm_state *xfrm_state_alloc(void);
878 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
879 struct flowi *fl, struct xfrm_tmpl *tmpl,
880 struct xfrm_policy *pol, int *err,
881 unsigned short family);
882 extern int xfrm_state_check_expire(struct xfrm_state *x);
883 extern void xfrm_state_insert(struct xfrm_state *x);
884 extern int xfrm_state_add(struct xfrm_state *x);
885 extern int xfrm_state_update(struct xfrm_state *x);
886 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
887 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
888 extern int xfrm_state_delete(struct xfrm_state *x);
889 extern void xfrm_state_flush(u8 proto);
890 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
891 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
892 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
893 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
894 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
895 extern int xfrm_init_state(struct xfrm_state *x);
896 extern int xfrm4_rcv(struct sk_buff *skb);
897 extern int xfrm4_output(struct sk_buff *skb);
898 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
899 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
900 extern int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi);
901 extern int xfrm6_rcv(struct sk_buff **pskb);
902 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
903 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
904 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
905 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
906 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
907 extern int xfrm6_output(struct sk_buff *skb);
910 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
911 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
912 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
914 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
919 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
921 /* should not happen */
925 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
931 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
932 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
933 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
934 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
935 struct xfrm_sec_ctx *ctx, int delete);
936 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
937 void xfrm_policy_flush(void);
938 u32 xfrm_get_acqseq(void);
939 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
940 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
941 xfrm_address_t *daddr, xfrm_address_t *saddr,
942 int create, unsigned short family);
943 extern void xfrm_policy_flush(void);
944 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
945 extern int xfrm_flush_bundles(void);
946 extern void xfrm_flush_all_bundles(void);
947 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
948 extern void xfrm_init_pmtu(struct dst_entry *dst);
950 extern wait_queue_head_t km_waitq;
951 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
952 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
954 extern void xfrm_input_init(void);
955 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
957 extern void xfrm_probe_algs(void);
958 extern int xfrm_count_auth_supported(void);
959 extern int xfrm_count_enc_supported(void);
960 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
961 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
962 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
963 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
964 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
965 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
966 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
967 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
970 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
972 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
973 int offset, int len, icv_update_fn_t icv_update);
975 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
981 return a->a4 - b->a4;
983 return ipv6_addr_cmp((struct in6_addr *)a,
984 (struct in6_addr *)b);
988 static inline int xfrm_policy_id2dir(u32 index)
993 static inline int xfrm_aevent_is_on(void)
999 nlsk = rcu_dereference(xfrm_nl);
1001 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1006 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1008 if (xfrm_aevent_is_on())
1009 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1013 #endif /* _NET_XFRM_H */