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>
17 #include <net/route.h>
19 #include <net/ip6_fib.h>
21 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
23 extern struct sock *xfrm_nl;
24 extern u32 sysctl_xfrm_aevent_etime;
25 extern u32 sysctl_xfrm_aevent_rseqth;
27 extern struct semaphore xfrm_cfg_sem;
29 /* Organization of SPD aka "XFRM rules"
30 ------------------------------------
33 - policy rule, struct xfrm_policy (=SPD entry)
34 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
35 - instance of a transformer, struct xfrm_state (=SA)
36 - template to clone xfrm_state, struct xfrm_tmpl
38 SPD is plain linear list of xfrm_policy rules, ordered by priority.
39 (To be compatible with existing pfkeyv2 implementations,
40 many rules with priority of 0x7fffffff are allowed to exist and
41 such rules are ordered in an unpredictable way, thanks to bsd folks.)
43 Lookup is plain linear search until the first match with selector.
45 If "action" is "block", then we prohibit the flow, otherwise:
46 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
47 policy entry has list of up to XFRM_MAX_DEPTH transformations,
48 described by templates xfrm_tmpl. Each template is resolved
49 to a complete xfrm_state (see below) and we pack bundle of transformations
50 to a dst_entry returned to requestor.
52 dst -. xfrm .-> xfrm_state #1
53 |---. child .-> dst -. xfrm .-> xfrm_state #2
54 |---. child .-> dst -. xfrm .-> xfrm_state #3
57 Bundles are cached at xrfm_policy struct (field ->bundles).
60 Resolution of xrfm_tmpl
61 -----------------------
63 1. ->mode Mode: transport or tunnel
64 2. ->id.proto Protocol: AH/ESP/IPCOMP
65 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
66 Q: allow to resolve security gateway?
67 4. ->id.spi If not zero, static SPI.
68 5. ->saddr Local tunnel endpoint, ignored for transport mode.
69 6. ->algos List of allowed algos. Plain bitmask now.
70 Q: ealgos, aalgos, calgos. What a mess...
71 7. ->share Sharing mode.
72 Q: how to implement private sharing mode? To add struct sock* to
75 Having this template we search through SAD searching for entries
76 with appropriate mode/proto/algo, permitted by selector.
77 If no appropriate entry found, it is requested from key manager.
80 Q: How to find all the bundles referring to a physical path for
81 PMTU discovery? Seems, dst should contain list of all parents...
82 and enter to infinite locking hierarchy disaster.
83 No! It is easier, we will not search for them, let them find us.
84 We add genid to each dst plus pointer to genid of raw IP route,
85 pmtu disc will update pmtu on raw IP route and increase its genid.
86 dst_check() will see this for top level and trigger resyncing
87 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
90 /* Full description of state of transformer. */
93 /* Note: bydst is re-used during gc */
94 struct list_head bydst;
95 struct list_head byspi;
101 struct xfrm_selector sel;
103 /* Key manger bits */
110 /* Parameters of this state. */
115 u8 aalgo, ealgo, calgo;
118 xfrm_address_t saddr;
123 struct xfrm_lifetime_cfg lft;
125 /* Data for transformer */
126 struct xfrm_algo *aalg;
127 struct xfrm_algo *ealg;
128 struct xfrm_algo *calg;
130 /* Data for encapsulator */
131 struct xfrm_encap_tmpl *encap;
133 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
134 struct xfrm_state *tunnel;
136 /* If a tunnel, number of users + 1 */
137 atomic_t tunnel_users;
139 /* State for replay detection */
140 struct xfrm_replay_state replay;
142 /* Replay detection state at the time we sent the last notification */
143 struct xfrm_replay_state preplay;
145 /* Replay detection notification settings */
149 /* Replay detection notification timer */
150 struct timer_list rtimer;
153 struct xfrm_stats stats;
155 struct xfrm_lifetime_cur curlft;
156 struct timer_list timer;
158 /* Reference to data common to all the instances of this
160 struct xfrm_type *type;
162 /* Security context */
163 struct xfrm_sec_ctx *security;
165 /* Private data of this transformer, format is opaque,
166 * interpreted by xfrm_type methods. */
179 /* callback structure passed from either netlink or pfkey */
196 struct xfrm_policy_afinfo {
197 unsigned short family;
199 struct xfrm_type_map *type_map;
200 struct dst_ops *dst_ops;
201 void (*garbage_collect)(void);
202 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
203 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
204 int (*bundle_create)(struct xfrm_policy *policy,
205 struct xfrm_state **xfrm,
208 struct dst_entry **dst_p);
209 void (*decode_session)(struct sk_buff *skb,
213 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
214 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
215 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
216 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
217 #define XFRM_ACQ_EXPIRES 30
220 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
221 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
222 extern int __xfrm_state_delete(struct xfrm_state *x);
224 struct xfrm_state_afinfo {
225 unsigned short family;
227 struct list_head *state_bydst;
228 struct list_head *state_byspi;
229 int (*init_flags)(struct xfrm_state *x);
230 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
231 struct xfrm_tmpl *tmpl,
232 xfrm_address_t *daddr, xfrm_address_t *saddr);
233 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
234 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
235 xfrm_address_t *daddr, xfrm_address_t *saddr,
239 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
240 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
242 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
244 struct xfrm_decap_state;
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 xfrm_decap_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);
608 /* Decapsulation state, used by the input to store data during
609 * decapsulation procedure, to be used later (during the policy
612 struct xfrm_decap_state {
617 struct sec_decap_state {
618 struct xfrm_state *xvec;
619 struct xfrm_decap_state decap;
626 struct sec_decap_state x[XFRM_MAX_DEPTH];
629 static inline struct sec_path *
630 secpath_get(struct sec_path *sp)
633 atomic_inc(&sp->refcnt);
637 extern void __secpath_destroy(struct sec_path *sp);
640 secpath_put(struct sec_path *sp)
642 if (sp && atomic_dec_and_test(&sp->refcnt))
643 __secpath_destroy(sp);
646 extern struct sec_path *secpath_dup(struct sec_path *src);
649 secpath_reset(struct sk_buff *skb)
652 secpath_put(skb->sp);
658 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
660 return (tmpl->saddr.a4 &&
661 tmpl->saddr.a4 != x->props.saddr.a4);
665 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
667 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
668 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
672 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
676 return __xfrm4_state_addr_cmp(tmpl, x);
678 return __xfrm6_state_addr_cmp(tmpl, x);
685 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
687 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
689 if (sk && sk->sk_policy[XFRM_POLICY_IN])
690 return __xfrm_policy_check(sk, dir, skb, family);
692 return (!xfrm_policy_list[dir] && !skb->sp) ||
693 (skb->dst->flags & DST_NOPOLICY) ||
694 __xfrm_policy_check(sk, dir, skb, family);
697 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
699 return xfrm_policy_check(sk, dir, skb, AF_INET);
702 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
704 return xfrm_policy_check(sk, dir, skb, AF_INET6);
707 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
708 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
710 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
712 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
713 (skb->dst->flags & DST_NOXFRM) ||
714 __xfrm_route_forward(skb, family);
717 static inline int xfrm4_route_forward(struct sk_buff *skb)
719 return xfrm_route_forward(skb, AF_INET);
722 static inline int xfrm6_route_forward(struct sk_buff *skb)
724 return xfrm_route_forward(skb, AF_INET6);
727 extern int __xfrm_sk_clone_policy(struct sock *sk);
729 static inline int xfrm_sk_clone_policy(struct sock *sk)
731 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
732 return __xfrm_sk_clone_policy(sk);
736 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
738 static inline void xfrm_sk_free_policy(struct sock *sk)
740 if (unlikely(sk->sk_policy[0] != NULL)) {
741 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
742 sk->sk_policy[0] = NULL;
744 if (unlikely(sk->sk_policy[1] != NULL)) {
745 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
746 sk->sk_policy[1] = NULL;
752 static inline void xfrm_sk_free_policy(struct sock *sk) {}
753 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
754 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
755 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
756 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
760 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
764 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
771 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
775 return (xfrm_address_t *)&fl->fl4_dst;
777 return (xfrm_address_t *)&fl->fl6_dst;
783 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
787 return (xfrm_address_t *)&fl->fl4_src;
789 return (xfrm_address_t *)&fl->fl6_src;
794 static __inline__ int
795 __xfrm4_state_addr_check(struct xfrm_state *x,
796 xfrm_address_t *daddr, xfrm_address_t *saddr)
798 if (daddr->a4 == x->id.daddr.a4 &&
799 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
804 static __inline__ int
805 __xfrm6_state_addr_check(struct xfrm_state *x,
806 xfrm_address_t *daddr, xfrm_address_t *saddr)
808 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
809 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
810 ipv6_addr_any((struct in6_addr *)saddr) ||
811 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
816 static __inline__ int
817 xfrm_state_addr_check(struct xfrm_state *x,
818 xfrm_address_t *daddr, xfrm_address_t *saddr,
819 unsigned short family)
823 return __xfrm4_state_addr_check(x, daddr, saddr);
825 return __xfrm6_state_addr_check(x, daddr, saddr);
830 static inline int xfrm_state_kern(struct xfrm_state *x)
832 return atomic_read(&x->tunnel_users);
836 * xfrm algorithm information
838 struct xfrm_algo_auth_info {
843 struct xfrm_algo_encr_info {
848 struct xfrm_algo_comp_info {
852 struct xfrm_algo_desc {
856 struct xfrm_algo_auth_info auth;
857 struct xfrm_algo_encr_info encr;
858 struct xfrm_algo_comp_info comp;
860 struct sadb_alg desc;
863 /* XFRM tunnel handlers. */
865 int (*handler)(struct sk_buff *skb);
866 void (*err_handler)(struct sk_buff *skb, __u32 info);
869 struct xfrm6_tunnel {
870 int (*handler)(struct sk_buff **pskb);
871 void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
872 int type, int code, int offset, __u32 info);
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 **pskb, 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)
1003 return netlink_has_listeners(xfrm_nl,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 */