4 #include <linux/xfrm.h>
5 #include <linux/spinlock.h>
6 #include <linux/list.h>
7 #include <linux/skbuff.h>
8 #include <linux/netdevice.h>
9 #include <linux/crypto.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/in6.h>
15 #include <net/route.h>
17 #include <net/ip6_fib.h>
19 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
21 extern struct semaphore xfrm_cfg_sem;
23 /* Organization of SPD aka "XFRM rules"
24 ------------------------------------
27 - policy rule, struct xfrm_policy (=SPD entry)
28 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
29 - instance of a transformer, struct xfrm_state (=SA)
30 - template to clone xfrm_state, struct xfrm_tmpl
32 SPD is plain linear list of xfrm_policy rules, ordered by priority.
33 (To be compatible with existing pfkeyv2 implementations,
34 many rules with priority of 0x7fffffff are allowed to exist and
35 such rules are ordered in an unpredictable way, thanks to bsd folks.)
37 Lookup is plain linear search until the first match with selector.
39 If "action" is "block", then we prohibit the flow, otherwise:
40 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
41 policy entry has list of up to XFRM_MAX_DEPTH transformations,
42 described by templates xfrm_tmpl. Each template is resolved
43 to a complete xfrm_state (see below) and we pack bundle of transformations
44 to a dst_entry returned to requestor.
46 dst -. xfrm .-> xfrm_state #1
47 |---. child .-> dst -. xfrm .-> xfrm_state #2
48 |---. child .-> dst -. xfrm .-> xfrm_state #3
51 Bundles are cached at xrfm_policy struct (field ->bundles).
54 Resolution of xrfm_tmpl
55 -----------------------
57 1. ->mode Mode: transport or tunnel
58 2. ->id.proto Protocol: AH/ESP/IPCOMP
59 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
60 Q: allow to resolve security gateway?
61 4. ->id.spi If not zero, static SPI.
62 5. ->saddr Local tunnel endpoint, ignored for transport mode.
63 6. ->algos List of allowed algos. Plain bitmask now.
64 Q: ealgos, aalgos, calgos. What a mess...
65 7. ->share Sharing mode.
66 Q: how to implement private sharing mode? To add struct sock* to
69 Having this template we search through SAD searching for entries
70 with appropriate mode/proto/algo, permitted by selector.
71 If no appropriate entry found, it is requested from key manager.
74 Q: How to find all the bundles referring to a physical path for
75 PMTU discovery? Seems, dst should contain list of all parents...
76 and enter to infinite locking hierarchy disaster.
77 No! It is easier, we will not search for them, let them find us.
78 We add genid to each dst plus pointer to genid of raw IP route,
79 pmtu disc will update pmtu on raw IP route and increase its genid.
80 dst_check() will see this for top level and trigger resyncing
81 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
84 /* Full description of state of transformer. */
87 /* Note: bydst is re-used during gc */
88 struct list_head bydst;
89 struct list_head byspi;
95 struct xfrm_selector sel;
104 /* Parameters of this state. */
109 u8 aalgo, ealgo, calgo;
112 xfrm_address_t saddr;
117 struct xfrm_lifetime_cfg lft;
119 /* Data for transformer */
120 struct xfrm_algo *aalg;
121 struct xfrm_algo *ealg;
122 struct xfrm_algo *calg;
124 /* Data for encapsulator */
125 struct xfrm_encap_tmpl *encap;
127 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
128 struct xfrm_state *tunnel;
130 /* If a tunnel, number of users + 1 */
131 atomic_t tunnel_users;
133 /* State for replay detection */
134 struct xfrm_replay_state replay;
137 struct xfrm_stats stats;
139 struct xfrm_lifetime_cur curlft;
140 struct timer_list timer;
142 /* Reference to data common to all the instances of this
144 struct xfrm_type *type;
146 /* Private data of this transformer, format is opaque,
147 * interpreted by xfrm_type methods. */
162 struct xfrm_policy_afinfo {
163 unsigned short family;
165 struct xfrm_type_map *type_map;
166 struct dst_ops *dst_ops;
167 void (*garbage_collect)(void);
168 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
169 struct dst_entry *(*find_bundle)(struct flowi *fl, struct rtable *rt, struct xfrm_policy *policy);
170 int (*bundle_create)(struct xfrm_policy *policy,
171 struct xfrm_state **xfrm,
174 struct dst_entry **dst_p);
175 void (*decode_session)(struct sk_buff *skb,
179 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
180 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
181 extern struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
182 extern void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
184 #define XFRM_ACQ_EXPIRES 30
187 struct xfrm_state_afinfo {
188 unsigned short family;
190 struct list_head *state_bydst;
191 struct list_head *state_byspi;
192 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
193 struct xfrm_tmpl *tmpl,
194 xfrm_address_t *daddr, xfrm_address_t *saddr);
195 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
196 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
197 xfrm_address_t *daddr, xfrm_address_t *saddr,
201 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
202 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
203 extern struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family);
204 extern void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
206 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
208 struct xfrm_decap_state;
212 struct module *owner;
215 int (*init_state)(struct xfrm_state *x, void *args);
216 void (*destructor)(struct xfrm_state *);
217 int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
218 int (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
219 int (*output)(struct sk_buff *skb);
220 /* Estimate maximal size of result of transformation of a dgram */
221 u32 (*get_max_size)(struct xfrm_state *, int size);
224 struct xfrm_type_map {
226 struct xfrm_type *map[256];
229 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
230 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
231 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
232 extern void xfrm_put_type(struct xfrm_type *type);
236 /* id in template is interpreted as:
237 * daddr - destination of tunnel, may be zero for transport mode.
238 * spi - zero to acquire spi. Not zero if spi is static, then
239 * daddr must be fixed too.
240 * proto - AH/ESP/IPCOMP
244 /* Source address of tunnel. Ignored, if it is not a tunnel. */
245 xfrm_address_t saddr;
249 /* Mode: transport/tunnel */
252 /* Sharing mode: unique, this session only, this user only etc. */
255 /* May skip this transfomration if no SA is found */
258 /* Bit mask of algos allowed for acquisition */
264 #define XFRM_MAX_DEPTH 4
268 struct xfrm_policy *next;
269 struct list_head list;
271 /* This lock only affects elements except for entry. */
274 struct timer_list timer;
278 struct xfrm_selector selector;
279 struct xfrm_lifetime_cfg lft;
280 struct xfrm_lifetime_cur curlft;
281 struct dst_entry *bundles;
287 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
290 #define XFRM_KM_TIMEOUT 30
294 struct list_head list;
296 int (*notify)(struct xfrm_state *x, int event);
297 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
298 struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
299 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
300 int (*notify_policy)(struct xfrm_policy *x, int dir, int event);
303 extern int xfrm_register_km(struct xfrm_mgr *km);
304 extern int xfrm_unregister_km(struct xfrm_mgr *km);
307 #define XFRM_FLOWCACHE_HASH_SIZE 1024
309 static inline u32 __flow_hash4(struct flowi *fl)
311 u32 hash = fl->fl4_src ^ fl->fl_ip_sport;
313 hash = ((hash & 0xF0F0F0F0) >> 4) | ((hash & 0x0F0F0F0F) << 4);
315 hash ^= fl->fl4_dst ^ fl->fl_ip_dport;
316 hash ^= (hash >> 10);
317 hash ^= (hash >> 20);
318 return hash & (XFRM_FLOWCACHE_HASH_SIZE-1);
321 static inline u32 __flow_hash6(struct flowi *fl)
323 u32 hash = fl->fl6_src.s6_addr32[2] ^
324 fl->fl6_src.s6_addr32[3] ^
327 hash = ((hash & 0xF0F0F0F0) >> 4) | ((hash & 0x0F0F0F0F) << 4);
329 hash ^= fl->fl6_dst.s6_addr32[2] ^
330 fl->fl6_dst.s6_addr32[3] ^
332 hash ^= (hash >> 10);
333 hash ^= (hash >> 20);
334 return hash & (XFRM_FLOWCACHE_HASH_SIZE-1);
337 static inline u32 flow_hash(struct flowi *fl, unsigned short family)
341 return __flow_hash4(fl);
343 return __flow_hash6(fl);
348 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
350 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
352 if (likely(policy != NULL))
353 atomic_inc(&policy->refcnt);
356 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
358 static inline void xfrm_pol_put(struct xfrm_policy *policy)
360 if (atomic_dec_and_test(&policy->refcnt))
361 __xfrm_policy_destroy(policy);
364 #define XFRM_DST_HSIZE 1024
367 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
371 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
376 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
379 h = ntohl(addr->a6[2]^addr->a6[3]);
380 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
385 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
389 return __xfrm4_dst_hash(addr);
391 return __xfrm6_dst_hash(addr);
397 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
400 h = ntohl(addr->a4^spi^proto);
401 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
406 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
409 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
410 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
415 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
419 return __xfrm4_spi_hash(addr, spi, proto);
421 return __xfrm6_spi_hash(addr, spi, proto);
426 extern void __xfrm_state_destroy(struct xfrm_state *);
428 static inline void xfrm_state_put(struct xfrm_state *x)
430 if (atomic_dec_and_test(&x->refcnt))
431 __xfrm_state_destroy(x);
434 static inline void xfrm_state_hold(struct xfrm_state *x)
436 atomic_inc(&x->refcnt);
439 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
446 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
447 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
450 if (memcmp(a1, a2, pdw << 2))
456 mask = htonl((0xffffffff) << (32 - pbi));
458 if ((a1[pdw] ^ a2[pdw]) & mask)
466 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
468 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
469 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
470 !((fl->fl_ip_dport^sel->dport)&sel->dport_mask) &&
471 !((fl->fl_ip_sport^sel->sport)&sel->sport_mask) &&
472 (fl->proto == sel->proto || !sel->proto) &&
473 (fl->oif == sel->ifindex || !sel->ifindex);
477 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
479 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
480 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
481 !((fl->fl_ip_dport^sel->dport)&sel->dport_mask) &&
482 !((fl->fl_ip_sport^sel->sport)&sel->sport_mask) &&
483 (fl->proto == sel->proto || !sel->proto) &&
484 (fl->oif == sel->ifindex || !sel->ifindex);
488 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
489 unsigned short family)
493 return __xfrm4_selector_match(sel, fl);
495 return __xfrm6_selector_match(sel, fl);
500 /* placeholder until xfrm6_tunnel.c is written */
501 static inline int xfrm6_tunnel_check_size(struct sk_buff *skb)
504 /* A struct encoding bundle of transformations to apply to some set of flow.
506 * dst->child points to the next element of bundle.
507 * dst->xfrm points to an instanse of transformer.
509 * Due to unfortunate limitations of current routing cache, which we
510 * have no time to fix, it mirrors struct rtable and bound to the same
511 * routing key, including saddr,daddr. However, we can have many of
512 * bundles differing by session id. All the bundles grow from a parent
518 struct xfrm_dst *next;
519 struct dst_entry dst;
525 /* Decapsulation state, used by the input to store data during
526 * decapsulation procedure, to be used later (during the policy
529 struct xfrm_decap_state {
534 struct sec_decap_state {
535 struct xfrm_state *xvec;
536 struct xfrm_decap_state decap;
543 struct sec_decap_state x[XFRM_MAX_DEPTH];
546 static inline struct sec_path *
547 secpath_get(struct sec_path *sp)
550 atomic_inc(&sp->refcnt);
554 extern void __secpath_destroy(struct sec_path *sp);
557 secpath_put(struct sec_path *sp)
559 if (sp && atomic_dec_and_test(&sp->refcnt))
560 __secpath_destroy(sp);
563 extern struct sec_path *secpath_dup(struct sec_path *src);
566 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
568 return (tmpl->saddr.a4 &&
569 tmpl->saddr.a4 != x->props.saddr.a4);
573 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
575 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
576 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
580 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
584 return __xfrm4_state_addr_cmp(tmpl, x);
586 return __xfrm6_state_addr_cmp(tmpl, x);
591 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
593 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
595 if (sk && sk->sk_policy[XFRM_POLICY_IN])
596 return __xfrm_policy_check(sk, dir, skb, family);
598 return !xfrm_policy_list[dir] ||
599 (skb->dst->flags & DST_NOPOLICY) ||
600 __xfrm_policy_check(sk, dir, skb, family);
603 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
605 return xfrm_policy_check(sk, dir, skb, AF_INET);
608 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
610 return xfrm_policy_check(sk, dir, skb, AF_INET6);
614 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
616 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
618 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
619 (skb->dst->flags & DST_NOXFRM) ||
620 __xfrm_route_forward(skb, family);
623 static inline int xfrm4_route_forward(struct sk_buff *skb)
625 return xfrm_route_forward(skb, AF_INET);
628 static inline int xfrm6_route_forward(struct sk_buff *skb)
630 return xfrm_route_forward(skb, AF_INET6);
633 extern int __xfrm_sk_clone_policy(struct sock *sk);
635 static inline int xfrm_sk_clone_policy(struct sock *sk)
637 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
638 return __xfrm_sk_clone_policy(sk);
642 extern void xfrm_policy_delete(struct xfrm_policy *pol, int dir);
644 static inline void xfrm_sk_free_policy(struct sock *sk)
646 if (unlikely(sk->sk_policy[0] != NULL)) {
647 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
648 sk->sk_policy[0] = NULL;
650 if (unlikely(sk->sk_policy[1] != NULL)) {
651 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
652 sk->sk_policy[1] = NULL;
657 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
661 return (xfrm_address_t *)&fl->fl4_dst;
663 return (xfrm_address_t *)&fl->fl6_dst;
669 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
673 return (xfrm_address_t *)&fl->fl4_src;
675 return (xfrm_address_t *)&fl->fl6_src;
680 static __inline__ int
681 __xfrm4_state_addr_check(struct xfrm_state *x,
682 xfrm_address_t *daddr, xfrm_address_t *saddr)
684 if (daddr->a4 == x->id.daddr.a4 &&
685 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
690 static __inline__ int
691 __xfrm6_state_addr_check(struct xfrm_state *x,
692 xfrm_address_t *daddr, xfrm_address_t *saddr)
694 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
695 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
696 ipv6_addr_any((struct in6_addr *)saddr) ||
697 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
702 static __inline__ int
703 xfrm_state_addr_check(struct xfrm_state *x,
704 xfrm_address_t *daddr, xfrm_address_t *saddr,
705 unsigned short family)
709 return __xfrm4_state_addr_check(x, daddr, saddr);
711 return __xfrm6_state_addr_check(x, daddr, saddr);
716 static inline int xfrm_state_kern(struct xfrm_state *x)
718 return atomic_read(&x->tunnel_users);
722 * xfrm algorithm information
724 struct xfrm_algo_auth_info {
729 struct xfrm_algo_encr_info {
734 struct xfrm_algo_comp_info {
738 struct xfrm_algo_desc {
742 struct xfrm_algo_auth_info auth;
743 struct xfrm_algo_encr_info encr;
744 struct xfrm_algo_comp_info comp;
746 struct sadb_alg desc;
749 /* XFRM tunnel handlers. */
751 int (*handler)(struct sk_buff *skb);
752 void (*err_handler)(struct sk_buff *skb, void *info);
755 extern void xfrm_init(void);
756 extern void xfrm4_init(void);
757 extern void xfrm4_fini(void);
758 extern void xfrm6_init(void);
759 extern void xfrm6_fini(void);
760 extern void xfrm_state_init(void);
761 extern void xfrm4_state_init(void);
762 extern void xfrm4_state_fini(void);
763 extern void xfrm6_state_init(void);
764 extern void xfrm6_state_fini(void);
766 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
767 extern struct xfrm_state *xfrm_state_alloc(void);
768 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
769 struct flowi *fl, struct xfrm_tmpl *tmpl,
770 struct xfrm_policy *pol, int *err,
771 unsigned short family);
772 extern int xfrm_state_check_expire(struct xfrm_state *x);
773 extern void xfrm_state_insert(struct xfrm_state *x);
774 extern int xfrm_state_add(struct xfrm_state *x);
775 extern int xfrm_state_update(struct xfrm_state *x);
776 extern int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb);
777 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
778 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
779 extern void xfrm_state_delete(struct xfrm_state *x);
780 extern void xfrm_state_flush(u8 proto);
781 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
782 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
783 extern int xfrm_check_selectors(struct xfrm_state **x, int n, struct flowi *fl);
784 extern int xfrm_check_output(struct xfrm_state *x, struct sk_buff *skb, unsigned short family);
785 extern int xfrm4_rcv(struct sk_buff *skb);
786 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
787 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
788 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
789 extern int xfrm4_tunnel_check_size(struct sk_buff *skb);
790 extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
791 extern int xfrm_user_policy(struct sock *sk, int optname, u8 *optval, int optlen);
793 void xfrm_policy_init(void);
794 void xfrm4_policy_init(void);
795 void xfrm6_policy_init(void);
796 struct xfrm_policy *xfrm_policy_alloc(int gfp);
797 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
798 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
799 struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel,
801 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
802 void xfrm_policy_flush(void);
803 u32 xfrm_get_acqseq(void);
804 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
805 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
806 xfrm_address_t *daddr, xfrm_address_t *saddr,
807 int create, unsigned short family);
808 extern void xfrm_policy_flush(void);
809 extern void xfrm_policy_kill(struct xfrm_policy *);
810 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
811 extern struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl);
812 extern int xfrm_flush_bundles(struct xfrm_state *x);
813 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
815 extern wait_queue_head_t km_waitq;
816 extern void km_state_expired(struct xfrm_state *x, int hard);
817 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *pol);
818 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
819 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard);
821 extern void xfrm_input_init(void);
822 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
824 extern void xfrm_probe_algs(void);
825 extern int xfrm_count_auth_supported(void);
826 extern int xfrm_count_enc_supported(void);
827 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
828 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
829 extern struct xfrm_algo_desc *xfrm_calg_get_byidx(unsigned int idx);
830 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
831 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
832 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
833 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name);
834 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name);
835 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name);
838 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
840 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
841 int offset, int len, icv_update_fn_t icv_update);
843 #endif /* _NET_XFRM_H */