4 #include <linux/compiler.h>
5 #include <linux/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/netdevice.h>
10 #include <linux/crypto.h>
11 #include <linux/pfkeyv2.h>
12 #include <linux/in6.h>
16 #include <net/route.h>
18 #include <net/ip6_fib.h>
20 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
22 extern struct semaphore xfrm_cfg_sem;
24 /* Organization of SPD aka "XFRM rules"
25 ------------------------------------
28 - policy rule, struct xfrm_policy (=SPD entry)
29 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
30 - instance of a transformer, struct xfrm_state (=SA)
31 - template to clone xfrm_state, struct xfrm_tmpl
33 SPD is plain linear list of xfrm_policy rules, ordered by priority.
34 (To be compatible with existing pfkeyv2 implementations,
35 many rules with priority of 0x7fffffff are allowed to exist and
36 such rules are ordered in an unpredictable way, thanks to bsd folks.)
38 Lookup is plain linear search until the first match with selector.
40 If "action" is "block", then we prohibit the flow, otherwise:
41 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
42 policy entry has list of up to XFRM_MAX_DEPTH transformations,
43 described by templates xfrm_tmpl. Each template is resolved
44 to a complete xfrm_state (see below) and we pack bundle of transformations
45 to a dst_entry returned to requestor.
47 dst -. xfrm .-> xfrm_state #1
48 |---. child .-> dst -. xfrm .-> xfrm_state #2
49 |---. child .-> dst -. xfrm .-> xfrm_state #3
52 Bundles are cached at xrfm_policy struct (field ->bundles).
55 Resolution of xrfm_tmpl
56 -----------------------
58 1. ->mode Mode: transport or tunnel
59 2. ->id.proto Protocol: AH/ESP/IPCOMP
60 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
61 Q: allow to resolve security gateway?
62 4. ->id.spi If not zero, static SPI.
63 5. ->saddr Local tunnel endpoint, ignored for transport mode.
64 6. ->algos List of allowed algos. Plain bitmask now.
65 Q: ealgos, aalgos, calgos. What a mess...
66 7. ->share Sharing mode.
67 Q: how to implement private sharing mode? To add struct sock* to
70 Having this template we search through SAD searching for entries
71 with appropriate mode/proto/algo, permitted by selector.
72 If no appropriate entry found, it is requested from key manager.
75 Q: How to find all the bundles referring to a physical path for
76 PMTU discovery? Seems, dst should contain list of all parents...
77 and enter to infinite locking hierarchy disaster.
78 No! It is easier, we will not search for them, let them find us.
79 We add genid to each dst plus pointer to genid of raw IP route,
80 pmtu disc will update pmtu on raw IP route and increase its genid.
81 dst_check() will see this for top level and trigger resyncing
82 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
85 /* Full description of state of transformer. */
88 /* Note: bydst is re-used during gc */
89 struct list_head bydst;
90 struct list_head byspi;
96 struct xfrm_selector sel;
105 /* Parameters of this state. */
110 u8 aalgo, ealgo, calgo;
113 xfrm_address_t saddr;
118 struct xfrm_lifetime_cfg lft;
120 /* Data for transformer */
121 struct xfrm_algo *aalg;
122 struct xfrm_algo *ealg;
123 struct xfrm_algo *calg;
125 /* Data for encapsulator */
126 struct xfrm_encap_tmpl *encap;
128 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
129 struct xfrm_state *tunnel;
131 /* If a tunnel, number of users + 1 */
132 atomic_t tunnel_users;
134 /* State for replay detection */
135 struct xfrm_replay_state replay;
138 struct xfrm_stats stats;
140 struct xfrm_lifetime_cur curlft;
141 struct timer_list timer;
143 /* Reference to data common to all the instances of this
145 struct xfrm_type *type;
147 /* Private data of this transformer, format is opaque,
148 * interpreted by xfrm_type methods. */
163 struct xfrm_policy_afinfo {
164 unsigned short family;
166 struct xfrm_type_map *type_map;
167 struct dst_ops *dst_ops;
168 void (*garbage_collect)(void);
169 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
170 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
171 int (*bundle_create)(struct xfrm_policy *policy,
172 struct xfrm_state **xfrm,
175 struct dst_entry **dst_p);
176 void (*decode_session)(struct sk_buff *skb,
180 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
181 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
183 #define XFRM_ACQ_EXPIRES 30
186 struct xfrm_state_afinfo {
187 unsigned short family;
189 struct list_head *state_bydst;
190 struct list_head *state_byspi;
191 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
192 struct xfrm_tmpl *tmpl,
193 xfrm_address_t *daddr, xfrm_address_t *saddr);
194 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
195 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
196 xfrm_address_t *daddr, xfrm_address_t *saddr,
200 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
201 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
203 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
205 struct xfrm_decap_state;
209 struct module *owner;
212 int (*init_state)(struct xfrm_state *x, void *args);
213 void (*destructor)(struct xfrm_state *);
214 int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
215 int (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
216 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
217 /* Estimate maximal size of result of transformation of a dgram */
218 u32 (*get_max_size)(struct xfrm_state *, int size);
221 struct xfrm_type_map {
223 struct xfrm_type *map[256];
226 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
227 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
228 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
229 extern void xfrm_put_type(struct xfrm_type *type);
233 /* id in template is interpreted as:
234 * daddr - destination of tunnel, may be zero for transport mode.
235 * spi - zero to acquire spi. Not zero if spi is static, then
236 * daddr must be fixed too.
237 * proto - AH/ESP/IPCOMP
241 /* Source address of tunnel. Ignored, if it is not a tunnel. */
242 xfrm_address_t saddr;
246 /* Mode: transport/tunnel */
249 /* Sharing mode: unique, this session only, this user only etc. */
252 /* May skip this transfomration if no SA is found */
255 /* Bit mask of algos allowed for acquisition */
261 #define XFRM_MAX_DEPTH 4
265 struct xfrm_policy *next;
266 struct list_head list;
268 /* This lock only affects elements except for entry. */
271 struct timer_list timer;
275 struct xfrm_selector selector;
276 struct xfrm_lifetime_cfg lft;
277 struct xfrm_lifetime_cur curlft;
278 struct dst_entry *bundles;
284 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
287 #define XFRM_KM_TIMEOUT 30
291 struct list_head list;
293 int (*notify)(struct xfrm_state *x, int event);
294 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
295 struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
296 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
297 int (*notify_policy)(struct xfrm_policy *x, int dir, int event);
300 extern int xfrm_register_km(struct xfrm_mgr *km);
301 extern int xfrm_unregister_km(struct xfrm_mgr *km);
304 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
306 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
308 if (likely(policy != NULL))
309 atomic_inc(&policy->refcnt);
312 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
314 static inline void xfrm_pol_put(struct xfrm_policy *policy)
316 if (atomic_dec_and_test(&policy->refcnt))
317 __xfrm_policy_destroy(policy);
320 #define XFRM_DST_HSIZE 1024
323 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
327 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
332 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
335 h = ntohl(addr->a6[2]^addr->a6[3]);
336 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
341 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
345 return __xfrm4_dst_hash(addr);
347 return __xfrm6_dst_hash(addr);
353 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
356 h = ntohl(addr->a4^spi^proto);
357 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
362 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
365 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
366 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
371 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
375 return __xfrm4_spi_hash(addr, spi, proto);
377 return __xfrm6_spi_hash(addr, spi, proto);
382 extern void __xfrm_state_destroy(struct xfrm_state *);
384 static inline void xfrm_state_put(struct xfrm_state *x)
386 if (atomic_dec_and_test(&x->refcnt))
387 __xfrm_state_destroy(x);
390 static inline void xfrm_state_hold(struct xfrm_state *x)
392 atomic_inc(&x->refcnt);
395 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
402 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
403 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
406 if (memcmp(a1, a2, pdw << 2))
412 mask = htonl((0xffffffff) << (32 - pbi));
414 if ((a1[pdw] ^ a2[pdw]) & mask)
422 u16 xfrm_flowi_sport(struct flowi *fl)
429 port = fl->fl_ip_sport;
433 port = htons(fl->fl_icmp_type);
442 u16 xfrm_flowi_dport(struct flowi *fl)
449 port = fl->fl_ip_dport;
453 port = htons(fl->fl_icmp_code);
462 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
464 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
465 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
466 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
467 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
468 (fl->proto == sel->proto || !sel->proto) &&
469 (fl->oif == sel->ifindex || !sel->ifindex);
473 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
475 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
476 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
477 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
478 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
479 (fl->proto == sel->proto || !sel->proto) &&
480 (fl->oif == sel->ifindex || !sel->ifindex);
484 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
485 unsigned short family)
489 return __xfrm4_selector_match(sel, fl);
491 return __xfrm6_selector_match(sel, fl);
496 /* A struct encoding bundle of transformations to apply to some set of flow.
498 * dst->child points to the next element of bundle.
499 * dst->xfrm points to an instanse of transformer.
501 * Due to unfortunate limitations of current routing cache, which we
502 * have no time to fix, it mirrors struct rtable and bound to the same
503 * routing key, including saddr,daddr. However, we can have many of
504 * bundles differing by session id. All the bundles grow from a parent
510 struct xfrm_dst *next;
511 struct dst_entry dst;
515 struct dst_entry *route;
516 u32 route_mtu_cached;
517 u32 child_mtu_cached;
522 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
524 dst_release(xdst->route);
525 if (likely(xdst->u.dst.xfrm))
526 xfrm_state_put(xdst->u.dst.xfrm);
529 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
531 /* Decapsulation state, used by the input to store data during
532 * decapsulation procedure, to be used later (during the policy
535 struct xfrm_decap_state {
540 struct sec_decap_state {
541 struct xfrm_state *xvec;
542 struct xfrm_decap_state decap;
549 struct sec_decap_state x[XFRM_MAX_DEPTH];
552 static inline struct sec_path *
553 secpath_get(struct sec_path *sp)
556 atomic_inc(&sp->refcnt);
560 extern void __secpath_destroy(struct sec_path *sp);
563 secpath_put(struct sec_path *sp)
565 if (sp && atomic_dec_and_test(&sp->refcnt))
566 __secpath_destroy(sp);
569 extern struct sec_path *secpath_dup(struct sec_path *src);
572 secpath_reset(struct sk_buff *skb)
575 secpath_put(skb->sp);
581 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
583 return (tmpl->saddr.a4 &&
584 tmpl->saddr.a4 != x->props.saddr.a4);
588 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
590 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
591 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
595 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
599 return __xfrm4_state_addr_cmp(tmpl, x);
601 return __xfrm6_state_addr_cmp(tmpl, x);
608 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
610 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
612 if (sk && sk->sk_policy[XFRM_POLICY_IN])
613 return __xfrm_policy_check(sk, dir, skb, family);
615 return (!xfrm_policy_list[dir] && !skb->sp) ||
616 (skb->dst->flags & DST_NOPOLICY) ||
617 __xfrm_policy_check(sk, dir, skb, family);
620 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
622 return xfrm_policy_check(sk, dir, skb, AF_INET);
625 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
627 return xfrm_policy_check(sk, dir, skb, AF_INET6);
631 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
633 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
635 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
636 (skb->dst->flags & DST_NOXFRM) ||
637 __xfrm_route_forward(skb, family);
640 static inline int xfrm4_route_forward(struct sk_buff *skb)
642 return xfrm_route_forward(skb, AF_INET);
645 static inline int xfrm6_route_forward(struct sk_buff *skb)
647 return xfrm_route_forward(skb, AF_INET6);
650 extern int __xfrm_sk_clone_policy(struct sock *sk);
652 static inline int xfrm_sk_clone_policy(struct sock *sk)
654 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
655 return __xfrm_sk_clone_policy(sk);
659 extern void xfrm_policy_delete(struct xfrm_policy *pol, int dir);
661 static inline void xfrm_sk_free_policy(struct sock *sk)
663 if (unlikely(sk->sk_policy[0] != NULL)) {
664 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
665 sk->sk_policy[0] = NULL;
667 if (unlikely(sk->sk_policy[1] != NULL)) {
668 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
669 sk->sk_policy[1] = NULL;
675 static inline void xfrm_sk_free_policy(struct sock *sk) {}
676 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
677 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
678 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
679 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
683 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
687 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
694 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
698 return (xfrm_address_t *)&fl->fl4_dst;
700 return (xfrm_address_t *)&fl->fl6_dst;
706 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
710 return (xfrm_address_t *)&fl->fl4_src;
712 return (xfrm_address_t *)&fl->fl6_src;
717 static __inline__ int
718 __xfrm4_state_addr_check(struct xfrm_state *x,
719 xfrm_address_t *daddr, xfrm_address_t *saddr)
721 if (daddr->a4 == x->id.daddr.a4 &&
722 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
727 static __inline__ int
728 __xfrm6_state_addr_check(struct xfrm_state *x,
729 xfrm_address_t *daddr, xfrm_address_t *saddr)
731 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
732 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
733 ipv6_addr_any((struct in6_addr *)saddr) ||
734 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
739 static __inline__ int
740 xfrm_state_addr_check(struct xfrm_state *x,
741 xfrm_address_t *daddr, xfrm_address_t *saddr,
742 unsigned short family)
746 return __xfrm4_state_addr_check(x, daddr, saddr);
748 return __xfrm6_state_addr_check(x, daddr, saddr);
753 static inline int xfrm_state_kern(struct xfrm_state *x)
755 return atomic_read(&x->tunnel_users);
759 * xfrm algorithm information
761 struct xfrm_algo_auth_info {
766 struct xfrm_algo_encr_info {
771 struct xfrm_algo_comp_info {
775 struct xfrm_algo_desc {
779 struct xfrm_algo_auth_info auth;
780 struct xfrm_algo_encr_info encr;
781 struct xfrm_algo_comp_info comp;
783 struct sadb_alg desc;
786 /* XFRM tunnel handlers. */
788 int (*handler)(struct sk_buff *skb);
789 void (*err_handler)(struct sk_buff *skb, void *info);
792 struct xfrm6_tunnel {
793 int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp);
794 void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
795 int type, int code, int offset, __u32 info);
798 extern void xfrm_init(void);
799 extern void xfrm4_init(void);
800 extern void xfrm6_init(void);
801 extern void xfrm6_fini(void);
802 extern void xfrm_state_init(void);
803 extern void xfrm4_state_init(void);
804 extern void xfrm4_state_fini(void);
805 extern void xfrm6_state_init(void);
806 extern void xfrm6_state_fini(void);
808 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
809 extern struct xfrm_state *xfrm_state_alloc(void);
810 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
811 struct flowi *fl, struct xfrm_tmpl *tmpl,
812 struct xfrm_policy *pol, int *err,
813 unsigned short family);
814 extern int xfrm_state_check_expire(struct xfrm_state *x);
815 extern void xfrm_state_insert(struct xfrm_state *x);
816 extern int xfrm_state_add(struct xfrm_state *x);
817 extern int xfrm_state_update(struct xfrm_state *x);
818 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
819 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
820 extern void xfrm_state_delete(struct xfrm_state *x);
821 extern void xfrm_state_flush(u8 proto);
822 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
823 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
824 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
825 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
826 extern int xfrm4_rcv(struct sk_buff *skb);
827 extern int xfrm4_output(struct sk_buff *skb);
828 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
829 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
830 extern int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi);
831 extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
832 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
833 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
834 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
835 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
836 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
837 extern int xfrm6_output(struct sk_buff *skb);
840 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
841 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
842 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
844 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
849 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
851 /* should not happen */
855 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
861 struct xfrm_policy *xfrm_policy_alloc(int gfp);
862 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
863 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
864 struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel,
866 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
867 void xfrm_policy_flush(void);
868 u32 xfrm_get_acqseq(void);
869 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
870 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
871 xfrm_address_t *daddr, xfrm_address_t *saddr,
872 int create, unsigned short family);
873 extern void xfrm_policy_flush(void);
874 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
875 extern int xfrm_flush_bundles(void);
876 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
877 extern void xfrm_init_pmtu(struct dst_entry *dst);
879 extern wait_queue_head_t km_waitq;
880 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
881 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard);
883 extern void xfrm_input_init(void);
884 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
886 extern void xfrm_probe_algs(void);
887 extern int xfrm_count_auth_supported(void);
888 extern int xfrm_count_enc_supported(void);
889 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
890 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
891 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
892 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
893 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
894 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
895 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
896 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
899 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
901 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
902 int offset, int len, icv_update_fn_t icv_update);
904 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
910 return a->a4 - b->a4;
912 return ipv6_addr_cmp((struct in6_addr *)a,
913 (struct in6_addr *)b);
917 #endif /* _NET_XFRM_H */