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 /* internal flag that only holds state for delayed aevent at the
151 /* Replay detection notification settings */
155 /* Replay detection notification timer */
156 struct timer_list rtimer;
159 struct xfrm_stats stats;
161 struct xfrm_lifetime_cur curlft;
162 struct timer_list timer;
164 /* Reference to data common to all the instances of this
166 struct xfrm_type *type;
168 /* Security context */
169 struct xfrm_sec_ctx *security;
171 /* Private data of this transformer, format is opaque,
172 * interpreted by xfrm_type methods. */
176 /* xflags - make enum if more show up */
177 #define XFRM_TIME_DEFER 1
188 /* callback structure passed from either netlink or pfkey */
205 struct xfrm_policy_afinfo {
206 unsigned short family;
208 struct xfrm_type_map *type_map;
209 struct dst_ops *dst_ops;
210 void (*garbage_collect)(void);
211 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
212 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
213 int (*bundle_create)(struct xfrm_policy *policy,
214 struct xfrm_state **xfrm,
217 struct dst_entry **dst_p);
218 void (*decode_session)(struct sk_buff *skb,
222 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
223 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
224 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
225 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
226 #define XFRM_ACQ_EXPIRES 30
229 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
230 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
231 extern int __xfrm_state_delete(struct xfrm_state *x);
233 struct xfrm_state_afinfo {
234 unsigned short family;
236 struct list_head *state_bydst;
237 struct list_head *state_byspi;
238 int (*init_flags)(struct xfrm_state *x);
239 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
240 struct xfrm_tmpl *tmpl,
241 xfrm_address_t *daddr, xfrm_address_t *saddr);
242 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
243 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
244 xfrm_address_t *daddr, xfrm_address_t *saddr,
248 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
249 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
251 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
256 struct module *owner;
259 int (*init_state)(struct xfrm_state *x);
260 void (*destructor)(struct xfrm_state *);
261 int (*input)(struct xfrm_state *, struct sk_buff *skb);
262 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
263 /* Estimate maximal size of result of transformation of a dgram */
264 u32 (*get_max_size)(struct xfrm_state *, int size);
267 struct xfrm_type_map {
269 struct xfrm_type *map[256];
272 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
273 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
274 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
275 extern void xfrm_put_type(struct xfrm_type *type);
279 /* id in template is interpreted as:
280 * daddr - destination of tunnel, may be zero for transport mode.
281 * spi - zero to acquire spi. Not zero if spi is static, then
282 * daddr must be fixed too.
283 * proto - AH/ESP/IPCOMP
287 /* Source address of tunnel. Ignored, if it is not a tunnel. */
288 xfrm_address_t saddr;
292 /* Mode: transport/tunnel */
295 /* Sharing mode: unique, this session only, this user only etc. */
298 /* May skip this transfomration if no SA is found */
301 /* Bit mask of algos allowed for acquisition */
307 #define XFRM_MAX_DEPTH 4
311 struct xfrm_policy *next;
312 struct list_head list;
314 /* This lock only affects elements except for entry. */
317 struct timer_list timer;
321 struct xfrm_selector selector;
322 struct xfrm_lifetime_cfg lft;
323 struct xfrm_lifetime_cur curlft;
324 struct dst_entry *bundles;
330 struct xfrm_sec_ctx *security;
331 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
334 #define XFRM_KM_TIMEOUT 30
336 #define XFRM_REPLAY_SEQ 1
337 #define XFRM_REPLAY_OSEQ 2
338 #define XFRM_REPLAY_SEQ_MASK 3
340 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
341 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
343 /* default aevent timeout in units of 100ms */
344 #define XFRM_AE_ETIME 10
345 /* Async Event timer multiplier */
346 #define XFRM_AE_ETH_M 10
347 /* default seq threshold size */
348 #define XFRM_AE_SEQT_SIZE 2
352 struct list_head list;
354 int (*notify)(struct xfrm_state *x, struct km_event *c);
355 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
356 struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
357 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
358 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
361 extern int xfrm_register_km(struct xfrm_mgr *km);
362 extern int xfrm_unregister_km(struct xfrm_mgr *km);
365 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
367 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
369 if (likely(policy != NULL))
370 atomic_inc(&policy->refcnt);
373 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
375 static inline void xfrm_pol_put(struct xfrm_policy *policy)
377 if (atomic_dec_and_test(&policy->refcnt))
378 __xfrm_policy_destroy(policy);
381 #define XFRM_DST_HSIZE 1024
384 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
388 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
393 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
396 h = ntohl(addr->a6[2]^addr->a6[3]);
397 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
402 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
406 return __xfrm4_dst_hash(addr);
408 return __xfrm6_dst_hash(addr);
414 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
417 h = ntohl(addr->a4^spi^proto);
418 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
423 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
426 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
427 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
432 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
436 return __xfrm4_spi_hash(addr, spi, proto);
438 return __xfrm6_spi_hash(addr, spi, proto);
443 extern void __xfrm_state_destroy(struct xfrm_state *);
445 static inline void __xfrm_state_put(struct xfrm_state *x)
447 atomic_dec(&x->refcnt);
450 static inline void xfrm_state_put(struct xfrm_state *x)
452 if (atomic_dec_and_test(&x->refcnt))
453 __xfrm_state_destroy(x);
456 static inline void xfrm_state_hold(struct xfrm_state *x)
458 atomic_inc(&x->refcnt);
461 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
468 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
469 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
472 if (memcmp(a1, a2, pdw << 2))
478 mask = htonl((0xffffffff) << (32 - pbi));
480 if ((a1[pdw] ^ a2[pdw]) & mask)
488 u16 xfrm_flowi_sport(struct flowi *fl)
495 port = fl->fl_ip_sport;
499 port = htons(fl->fl_icmp_type);
508 u16 xfrm_flowi_dport(struct flowi *fl)
515 port = fl->fl_ip_dport;
519 port = htons(fl->fl_icmp_code);
528 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
530 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
531 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
532 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
533 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
534 (fl->proto == sel->proto || !sel->proto) &&
535 (fl->oif == sel->ifindex || !sel->ifindex);
539 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
541 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
542 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
543 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
544 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
545 (fl->proto == sel->proto || !sel->proto) &&
546 (fl->oif == sel->ifindex || !sel->ifindex);
550 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
551 unsigned short family)
555 return __xfrm4_selector_match(sel, fl);
557 return __xfrm6_selector_match(sel, fl);
562 #ifdef CONFIG_SECURITY_NETWORK_XFRM
563 /* If neither has a context --> match
564 * Otherwise, both must have a context and the sids, doi, alg must match
566 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
568 return ((!s1 && !s2) ||
570 (s1->ctx_sid == s2->ctx_sid) &&
571 (s1->ctx_doi == s2->ctx_doi) &&
572 (s1->ctx_alg == s2->ctx_alg)));
575 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
581 /* A struct encoding bundle of transformations to apply to some set of flow.
583 * dst->child points to the next element of bundle.
584 * dst->xfrm points to an instanse of transformer.
586 * Due to unfortunate limitations of current routing cache, which we
587 * have no time to fix, it mirrors struct rtable and bound to the same
588 * routing key, including saddr,daddr. However, we can have many of
589 * bundles differing by session id. All the bundles grow from a parent
595 struct xfrm_dst *next;
596 struct dst_entry dst;
600 struct dst_entry *route;
601 u32 route_mtu_cached;
602 u32 child_mtu_cached;
607 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
609 dst_release(xdst->route);
610 if (likely(xdst->u.dst.xfrm))
611 xfrm_state_put(xdst->u.dst.xfrm);
614 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
620 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
623 static inline struct sec_path *
624 secpath_get(struct sec_path *sp)
627 atomic_inc(&sp->refcnt);
631 extern void __secpath_destroy(struct sec_path *sp);
634 secpath_put(struct sec_path *sp)
636 if (sp && atomic_dec_and_test(&sp->refcnt))
637 __secpath_destroy(sp);
640 extern struct sec_path *secpath_dup(struct sec_path *src);
643 secpath_reset(struct sk_buff *skb)
646 secpath_put(skb->sp);
652 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
654 return (tmpl->saddr.a4 &&
655 tmpl->saddr.a4 != x->props.saddr.a4);
659 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
661 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
662 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
666 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
670 return __xfrm4_state_addr_cmp(tmpl, x);
672 return __xfrm6_state_addr_cmp(tmpl, x);
679 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
681 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
683 if (sk && sk->sk_policy[XFRM_POLICY_IN])
684 return __xfrm_policy_check(sk, dir, skb, family);
686 return (!xfrm_policy_list[dir] && !skb->sp) ||
687 (skb->dst->flags & DST_NOPOLICY) ||
688 __xfrm_policy_check(sk, dir, skb, family);
691 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
693 return xfrm_policy_check(sk, dir, skb, AF_INET);
696 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
698 return xfrm_policy_check(sk, dir, skb, AF_INET6);
701 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
702 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
704 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
706 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
707 (skb->dst->flags & DST_NOXFRM) ||
708 __xfrm_route_forward(skb, family);
711 static inline int xfrm4_route_forward(struct sk_buff *skb)
713 return xfrm_route_forward(skb, AF_INET);
716 static inline int xfrm6_route_forward(struct sk_buff *skb)
718 return xfrm_route_forward(skb, AF_INET6);
721 extern int __xfrm_sk_clone_policy(struct sock *sk);
723 static inline int xfrm_sk_clone_policy(struct sock *sk)
725 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
726 return __xfrm_sk_clone_policy(sk);
730 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
732 static inline void xfrm_sk_free_policy(struct sock *sk)
734 if (unlikely(sk->sk_policy[0] != NULL)) {
735 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
736 sk->sk_policy[0] = NULL;
738 if (unlikely(sk->sk_policy[1] != NULL)) {
739 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
740 sk->sk_policy[1] = NULL;
746 static inline void xfrm_sk_free_policy(struct sock *sk) {}
747 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
748 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
749 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
750 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
754 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
758 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
765 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
769 return (xfrm_address_t *)&fl->fl4_dst;
771 return (xfrm_address_t *)&fl->fl6_dst;
777 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
781 return (xfrm_address_t *)&fl->fl4_src;
783 return (xfrm_address_t *)&fl->fl6_src;
788 static __inline__ int
789 __xfrm4_state_addr_check(struct xfrm_state *x,
790 xfrm_address_t *daddr, xfrm_address_t *saddr)
792 if (daddr->a4 == x->id.daddr.a4 &&
793 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
798 static __inline__ int
799 __xfrm6_state_addr_check(struct xfrm_state *x,
800 xfrm_address_t *daddr, xfrm_address_t *saddr)
802 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
803 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
804 ipv6_addr_any((struct in6_addr *)saddr) ||
805 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
810 static __inline__ int
811 xfrm_state_addr_check(struct xfrm_state *x,
812 xfrm_address_t *daddr, xfrm_address_t *saddr,
813 unsigned short family)
817 return __xfrm4_state_addr_check(x, daddr, saddr);
819 return __xfrm6_state_addr_check(x, daddr, saddr);
824 static inline int xfrm_state_kern(struct xfrm_state *x)
826 return atomic_read(&x->tunnel_users);
830 * xfrm algorithm information
832 struct xfrm_algo_auth_info {
837 struct xfrm_algo_encr_info {
842 struct xfrm_algo_comp_info {
846 struct xfrm_algo_desc {
850 struct xfrm_algo_auth_info auth;
851 struct xfrm_algo_encr_info encr;
852 struct xfrm_algo_comp_info comp;
854 struct sadb_alg desc;
857 /* XFRM tunnel handlers. */
859 int (*handler)(struct sk_buff *skb);
860 int (*err_handler)(struct sk_buff *skb, __u32 info);
862 struct xfrm_tunnel *next;
866 struct xfrm6_tunnel {
867 int (*handler)(struct sk_buff *skb);
868 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
869 int type, int code, int offset, __u32 info);
871 struct xfrm6_tunnel *next;
875 extern void xfrm_init(void);
876 extern void xfrm4_init(void);
877 extern void xfrm6_init(void);
878 extern void xfrm6_fini(void);
879 extern void xfrm_state_init(void);
880 extern void xfrm4_state_init(void);
881 extern void xfrm6_state_init(void);
882 extern void xfrm6_state_fini(void);
884 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
885 extern struct xfrm_state *xfrm_state_alloc(void);
886 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
887 struct flowi *fl, struct xfrm_tmpl *tmpl,
888 struct xfrm_policy *pol, int *err,
889 unsigned short family);
890 extern int xfrm_state_check_expire(struct xfrm_state *x);
891 extern void xfrm_state_insert(struct xfrm_state *x);
892 extern int xfrm_state_add(struct xfrm_state *x);
893 extern int xfrm_state_update(struct xfrm_state *x);
894 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
895 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
896 extern int xfrm_state_delete(struct xfrm_state *x);
897 extern void xfrm_state_flush(u8 proto);
898 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
899 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
900 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
901 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
902 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
903 extern int xfrm_init_state(struct xfrm_state *x);
904 extern int xfrm4_rcv(struct sk_buff *skb);
905 extern int xfrm4_output(struct sk_buff *skb);
906 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
907 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
908 extern int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi);
909 extern int xfrm6_rcv(struct sk_buff **pskb);
910 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
911 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
912 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
913 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
914 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
915 extern int xfrm6_output(struct sk_buff *skb);
918 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
919 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
920 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
922 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
927 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
929 /* should not happen */
933 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
939 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
940 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
941 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
942 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
943 struct xfrm_sec_ctx *ctx, int delete);
944 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
945 void xfrm_policy_flush(void);
946 u32 xfrm_get_acqseq(void);
947 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
948 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
949 xfrm_address_t *daddr, xfrm_address_t *saddr,
950 int create, unsigned short family);
951 extern void xfrm_policy_flush(void);
952 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
953 extern int xfrm_flush_bundles(void);
954 extern void xfrm_flush_all_bundles(void);
955 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
956 extern void xfrm_init_pmtu(struct dst_entry *dst);
958 extern wait_queue_head_t km_waitq;
959 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
960 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
962 extern void xfrm_input_init(void);
963 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
965 extern void xfrm_probe_algs(void);
966 extern int xfrm_count_auth_supported(void);
967 extern int xfrm_count_enc_supported(void);
968 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
969 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
970 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
971 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
972 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
973 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
974 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
975 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
978 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
980 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
981 int offset, int len, icv_update_fn_t icv_update);
983 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
989 return a->a4 - b->a4;
991 return ipv6_addr_cmp((struct in6_addr *)a,
992 (struct in6_addr *)b);
996 static inline int xfrm_policy_id2dir(u32 index)
1001 static inline int xfrm_aevent_is_on(void)
1007 nlsk = rcu_dereference(xfrm_nl);
1009 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1014 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1016 if (xfrm_aevent_is_on())
1017 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1021 #endif /* _NET_XFRM_H */