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 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);
182 #define XFRM_ACQ_EXPIRES 30
185 struct xfrm_state_afinfo {
186 unsigned short family;
188 struct list_head *state_bydst;
189 struct list_head *state_byspi;
190 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
191 struct xfrm_tmpl *tmpl,
192 xfrm_address_t *daddr, xfrm_address_t *saddr);
193 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
194 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
195 xfrm_address_t *daddr, xfrm_address_t *saddr,
199 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
200 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
202 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
204 struct xfrm_decap_state;
208 struct module *owner;
211 int (*init_state)(struct xfrm_state *x, void *args);
212 void (*destructor)(struct xfrm_state *);
213 int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
214 int (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
215 int (*output)(struct sk_buff *pskb);
216 /* Estimate maximal size of result of transformation of a dgram */
217 u32 (*get_max_size)(struct xfrm_state *, int size);
220 struct xfrm_type_map {
222 struct xfrm_type *map[256];
225 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
226 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
227 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
228 extern void xfrm_put_type(struct xfrm_type *type);
232 /* id in template is interpreted as:
233 * daddr - destination of tunnel, may be zero for transport mode.
234 * spi - zero to acquire spi. Not zero if spi is static, then
235 * daddr must be fixed too.
236 * proto - AH/ESP/IPCOMP
240 /* Source address of tunnel. Ignored, if it is not a tunnel. */
241 xfrm_address_t saddr;
245 /* Mode: transport/tunnel */
248 /* Sharing mode: unique, this session only, this user only etc. */
251 /* May skip this transfomration if no SA is found */
254 /* Bit mask of algos allowed for acquisition */
260 #define XFRM_MAX_DEPTH 4
264 struct xfrm_policy *next;
265 struct list_head list;
267 /* This lock only affects elements except for entry. */
270 struct timer_list timer;
274 struct xfrm_selector selector;
275 struct xfrm_lifetime_cfg lft;
276 struct xfrm_lifetime_cur curlft;
277 struct dst_entry *bundles;
283 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
286 #define XFRM_KM_TIMEOUT 30
290 struct list_head list;
292 int (*notify)(struct xfrm_state *x, int event);
293 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
294 struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
295 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
296 int (*notify_policy)(struct xfrm_policy *x, int dir, int event);
299 extern int xfrm_register_km(struct xfrm_mgr *km);
300 extern int xfrm_unregister_km(struct xfrm_mgr *km);
303 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
305 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
307 if (likely(policy != NULL))
308 atomic_inc(&policy->refcnt);
311 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
313 static inline void xfrm_pol_put(struct xfrm_policy *policy)
315 if (atomic_dec_and_test(&policy->refcnt))
316 __xfrm_policy_destroy(policy);
319 #define XFRM_DST_HSIZE 1024
322 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
326 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
331 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
334 h = ntohl(addr->a6[2]^addr->a6[3]);
335 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
340 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
344 return __xfrm4_dst_hash(addr);
346 return __xfrm6_dst_hash(addr);
352 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
355 h = ntohl(addr->a4^spi^proto);
356 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
361 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
364 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
365 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
370 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
374 return __xfrm4_spi_hash(addr, spi, proto);
376 return __xfrm6_spi_hash(addr, spi, proto);
381 extern void __xfrm_state_destroy(struct xfrm_state *);
383 static inline void xfrm_state_put(struct xfrm_state *x)
385 if (atomic_dec_and_test(&x->refcnt))
386 __xfrm_state_destroy(x);
389 static inline void xfrm_state_hold(struct xfrm_state *x)
391 atomic_inc(&x->refcnt);
394 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
401 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
402 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
405 if (memcmp(a1, a2, pdw << 2))
411 mask = htonl((0xffffffff) << (32 - pbi));
413 if ((a1[pdw] ^ a2[pdw]) & mask)
421 u16 xfrm_flowi_sport(struct flowi *fl)
428 port = fl->fl_ip_sport;
432 port = htons(fl->fl_icmp_type);
441 u16 xfrm_flowi_dport(struct flowi *fl)
448 port = fl->fl_ip_dport;
452 port = htons(fl->fl_icmp_code);
461 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
463 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
464 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
465 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
466 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
467 (fl->proto == sel->proto || !sel->proto) &&
468 (fl->oif == sel->ifindex || !sel->ifindex);
472 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
474 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
475 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
476 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
477 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
478 (fl->proto == sel->proto || !sel->proto) &&
479 (fl->oif == sel->ifindex || !sel->ifindex);
483 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
484 unsigned short family)
488 return __xfrm4_selector_match(sel, fl);
490 return __xfrm6_selector_match(sel, fl);
495 /* A struct encoding bundle of transformations to apply to some set of flow.
497 * dst->child points to the next element of bundle.
498 * dst->xfrm points to an instanse of transformer.
500 * Due to unfortunate limitations of current routing cache, which we
501 * have no time to fix, it mirrors struct rtable and bound to the same
502 * routing key, including saddr,daddr. However, we can have many of
503 * bundles differing by session id. All the bundles grow from a parent
509 struct xfrm_dst *next;
510 struct dst_entry dst;
516 /* Decapsulation state, used by the input to store data during
517 * decapsulation procedure, to be used later (during the policy
520 struct xfrm_decap_state {
525 struct sec_decap_state {
526 struct xfrm_state *xvec;
527 struct xfrm_decap_state decap;
534 struct sec_decap_state x[XFRM_MAX_DEPTH];
537 static inline struct sec_path *
538 secpath_get(struct sec_path *sp)
541 atomic_inc(&sp->refcnt);
545 extern void __secpath_destroy(struct sec_path *sp);
548 secpath_put(struct sec_path *sp)
550 if (sp && atomic_dec_and_test(&sp->refcnt))
551 __secpath_destroy(sp);
554 extern struct sec_path *secpath_dup(struct sec_path *src);
557 secpath_reset(struct sk_buff *skb)
560 secpath_put(skb->sp);
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);
593 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
595 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
597 if (sk && sk->sk_policy[XFRM_POLICY_IN])
598 return __xfrm_policy_check(sk, dir, skb, family);
600 return (!xfrm_policy_list[dir] && !skb->sp) ||
601 (skb->dst->flags & DST_NOPOLICY) ||
602 __xfrm_policy_check(sk, dir, skb, family);
605 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
607 return xfrm_policy_check(sk, dir, skb, AF_INET);
610 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
612 return xfrm_policy_check(sk, dir, skb, AF_INET6);
616 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
618 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
620 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
621 (skb->dst->flags & DST_NOXFRM) ||
622 __xfrm_route_forward(skb, family);
625 static inline int xfrm4_route_forward(struct sk_buff *skb)
627 return xfrm_route_forward(skb, AF_INET);
630 static inline int xfrm6_route_forward(struct sk_buff *skb)
632 return xfrm_route_forward(skb, AF_INET6);
635 extern int __xfrm_sk_clone_policy(struct sock *sk);
637 static inline int xfrm_sk_clone_policy(struct sock *sk)
639 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
640 return __xfrm_sk_clone_policy(sk);
644 extern void xfrm_policy_delete(struct xfrm_policy *pol, int dir);
646 static inline void xfrm_sk_free_policy(struct sock *sk)
648 if (unlikely(sk->sk_policy[0] != NULL)) {
649 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
650 sk->sk_policy[0] = NULL;
652 if (unlikely(sk->sk_policy[1] != NULL)) {
653 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
654 sk->sk_policy[1] = NULL;
660 static inline void xfrm_sk_free_policy(struct sock *sk) {}
661 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
662 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
663 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
664 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
668 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
672 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
679 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
683 return (xfrm_address_t *)&fl->fl4_dst;
685 return (xfrm_address_t *)&fl->fl6_dst;
691 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
695 return (xfrm_address_t *)&fl->fl4_src;
697 return (xfrm_address_t *)&fl->fl6_src;
702 static __inline__ int
703 __xfrm4_state_addr_check(struct xfrm_state *x,
704 xfrm_address_t *daddr, xfrm_address_t *saddr)
706 if (daddr->a4 == x->id.daddr.a4 &&
707 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
712 static __inline__ int
713 __xfrm6_state_addr_check(struct xfrm_state *x,
714 xfrm_address_t *daddr, xfrm_address_t *saddr)
716 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
717 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
718 ipv6_addr_any((struct in6_addr *)saddr) ||
719 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
724 static __inline__ int
725 xfrm_state_addr_check(struct xfrm_state *x,
726 xfrm_address_t *daddr, xfrm_address_t *saddr,
727 unsigned short family)
731 return __xfrm4_state_addr_check(x, daddr, saddr);
733 return __xfrm6_state_addr_check(x, daddr, saddr);
738 static inline int xfrm_state_kern(struct xfrm_state *x)
740 return atomic_read(&x->tunnel_users);
744 * xfrm algorithm information
746 struct xfrm_algo_auth_info {
751 struct xfrm_algo_encr_info {
756 struct xfrm_algo_comp_info {
760 struct xfrm_algo_desc {
764 struct xfrm_algo_auth_info auth;
765 struct xfrm_algo_encr_info encr;
766 struct xfrm_algo_comp_info comp;
768 struct sadb_alg desc;
771 /* XFRM tunnel handlers. */
773 int (*handler)(struct sk_buff *skb);
774 void (*err_handler)(struct sk_buff *skb, void *info);
777 struct xfrm6_tunnel {
778 int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp);
779 void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
780 int type, int code, int offset, __u32 info);
783 extern void xfrm_init(void);
784 extern void xfrm4_init(void);
785 extern void xfrm6_init(void);
786 extern void xfrm6_fini(void);
787 extern void xfrm_state_init(void);
788 extern void xfrm4_state_init(void);
789 extern void xfrm4_state_fini(void);
790 extern void xfrm6_state_init(void);
791 extern void xfrm6_state_fini(void);
793 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
794 extern struct xfrm_state *xfrm_state_alloc(void);
795 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
796 struct flowi *fl, struct xfrm_tmpl *tmpl,
797 struct xfrm_policy *pol, int *err,
798 unsigned short family);
799 extern int xfrm_state_check_expire(struct xfrm_state *x);
800 extern void xfrm_state_insert(struct xfrm_state *x);
801 extern int xfrm_state_add(struct xfrm_state *x);
802 extern int xfrm_state_update(struct xfrm_state *x);
803 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
804 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
805 extern void xfrm_state_delete(struct xfrm_state *x);
806 extern void xfrm_state_flush(u8 proto);
807 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
808 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
809 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
810 extern int xfrm4_rcv(struct sk_buff *skb);
811 extern int xfrm4_output(struct sk_buff *skb);
812 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
813 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
814 extern int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi);
815 extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
816 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
817 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
818 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
819 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
820 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
821 extern int xfrm6_output(struct sk_buff *skb);
824 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
825 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
826 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
828 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
833 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
835 /* should not happen */
839 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
845 struct xfrm_policy *xfrm_policy_alloc(int gfp);
846 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
847 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
848 struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel,
850 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
851 void xfrm_policy_flush(void);
852 u32 xfrm_get_acqseq(void);
853 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
854 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
855 xfrm_address_t *daddr, xfrm_address_t *saddr,
856 int create, unsigned short family);
857 extern void xfrm_policy_flush(void);
858 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
859 extern int xfrm_flush_bundles(void);
861 extern wait_queue_head_t km_waitq;
862 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
863 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard);
865 extern void xfrm_input_init(void);
866 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
868 extern void xfrm_probe_algs(void);
869 extern int xfrm_count_auth_supported(void);
870 extern int xfrm_count_enc_supported(void);
871 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
872 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
873 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
874 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
875 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
876 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
877 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
878 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
881 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
883 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
884 int offset, int len, icv_update_fn_t icv_update);
886 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
892 return a->a4 - b->a4;
894 return ipv6_addr_cmp((struct in6_addr *)a,
895 (struct in6_addr *)b);
899 #endif /* _NET_XFRM_H */