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 /* Security context */
148 struct xfrm_sec_ctx *security;
150 /* Private data of this transformer, format is opaque,
151 * interpreted by xfrm_type methods. */
164 /* callback structure passed from either netlink or pfkey */
180 struct xfrm_policy_afinfo {
181 unsigned short family;
183 struct xfrm_type_map *type_map;
184 struct dst_ops *dst_ops;
185 void (*garbage_collect)(void);
186 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
187 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
188 int (*bundle_create)(struct xfrm_policy *policy,
189 struct xfrm_state **xfrm,
192 struct dst_entry **dst_p);
193 void (*decode_session)(struct sk_buff *skb,
197 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
198 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
199 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
200 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
202 #define XFRM_ACQ_EXPIRES 30
205 struct xfrm_state_afinfo {
206 unsigned short family;
208 struct list_head *state_bydst;
209 struct list_head *state_byspi;
210 int (*init_flags)(struct xfrm_state *x);
211 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
212 struct xfrm_tmpl *tmpl,
213 xfrm_address_t *daddr, xfrm_address_t *saddr);
214 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
215 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
216 xfrm_address_t *daddr, xfrm_address_t *saddr,
220 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
221 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
223 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
225 struct xfrm_decap_state;
229 struct module *owner;
232 int (*init_state)(struct xfrm_state *x);
233 void (*destructor)(struct xfrm_state *);
234 int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
235 int (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
236 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
237 /* Estimate maximal size of result of transformation of a dgram */
238 u32 (*get_max_size)(struct xfrm_state *, int size);
241 struct xfrm_type_map {
243 struct xfrm_type *map[256];
246 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
247 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
248 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
249 extern void xfrm_put_type(struct xfrm_type *type);
253 /* id in template is interpreted as:
254 * daddr - destination of tunnel, may be zero for transport mode.
255 * spi - zero to acquire spi. Not zero if spi is static, then
256 * daddr must be fixed too.
257 * proto - AH/ESP/IPCOMP
261 /* Source address of tunnel. Ignored, if it is not a tunnel. */
262 xfrm_address_t saddr;
266 /* Mode: transport/tunnel */
269 /* Sharing mode: unique, this session only, this user only etc. */
272 /* May skip this transfomration if no SA is found */
275 /* Bit mask of algos allowed for acquisition */
281 #define XFRM_MAX_DEPTH 4
285 struct xfrm_policy *next;
286 struct list_head list;
288 /* This lock only affects elements except for entry. */
291 struct timer_list timer;
295 struct xfrm_selector selector;
296 struct xfrm_lifetime_cfg lft;
297 struct xfrm_lifetime_cur curlft;
298 struct dst_entry *bundles;
304 struct xfrm_sec_ctx *security;
305 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
308 #define XFRM_KM_TIMEOUT 30
312 struct list_head list;
314 int (*notify)(struct xfrm_state *x, struct km_event *c);
315 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
316 struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
317 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
318 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
321 extern int xfrm_register_km(struct xfrm_mgr *km);
322 extern int xfrm_unregister_km(struct xfrm_mgr *km);
325 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
327 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
329 if (likely(policy != NULL))
330 atomic_inc(&policy->refcnt);
333 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
335 static inline void xfrm_pol_put(struct xfrm_policy *policy)
337 if (atomic_dec_and_test(&policy->refcnt))
338 __xfrm_policy_destroy(policy);
341 #define XFRM_DST_HSIZE 1024
344 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
348 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
353 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
356 h = ntohl(addr->a6[2]^addr->a6[3]);
357 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
362 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
366 return __xfrm4_dst_hash(addr);
368 return __xfrm6_dst_hash(addr);
374 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
377 h = ntohl(addr->a4^spi^proto);
378 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
383 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
386 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
387 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
392 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
396 return __xfrm4_spi_hash(addr, spi, proto);
398 return __xfrm6_spi_hash(addr, spi, proto);
403 extern void __xfrm_state_destroy(struct xfrm_state *);
405 static inline void xfrm_state_put(struct xfrm_state *x)
407 if (atomic_dec_and_test(&x->refcnt))
408 __xfrm_state_destroy(x);
411 static inline void xfrm_state_hold(struct xfrm_state *x)
413 atomic_inc(&x->refcnt);
416 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
423 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
424 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
427 if (memcmp(a1, a2, pdw << 2))
433 mask = htonl((0xffffffff) << (32 - pbi));
435 if ((a1[pdw] ^ a2[pdw]) & mask)
443 u16 xfrm_flowi_sport(struct flowi *fl)
450 port = fl->fl_ip_sport;
454 port = htons(fl->fl_icmp_type);
463 u16 xfrm_flowi_dport(struct flowi *fl)
470 port = fl->fl_ip_dport;
474 port = htons(fl->fl_icmp_code);
483 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
485 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
486 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
487 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
488 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
489 (fl->proto == sel->proto || !sel->proto) &&
490 (fl->oif == sel->ifindex || !sel->ifindex);
494 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
496 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
497 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
498 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
499 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
500 (fl->proto == sel->proto || !sel->proto) &&
501 (fl->oif == sel->ifindex || !sel->ifindex);
505 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
506 unsigned short family)
510 return __xfrm4_selector_match(sel, fl);
512 return __xfrm6_selector_match(sel, fl);
517 #ifdef CONFIG_SECURITY_NETWORK_XFRM
518 /* If neither has a context --> match
519 * Otherwise, both must have a context and the sids, doi, alg must match
521 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
523 return ((!s1 && !s2) ||
525 (s1->ctx_sid == s2->ctx_sid) &&
526 (s1->ctx_doi == s2->ctx_doi) &&
527 (s1->ctx_alg == s2->ctx_alg)));
530 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
536 /* A struct encoding bundle of transformations to apply to some set of flow.
538 * dst->child points to the next element of bundle.
539 * dst->xfrm points to an instanse of transformer.
541 * Due to unfortunate limitations of current routing cache, which we
542 * have no time to fix, it mirrors struct rtable and bound to the same
543 * routing key, including saddr,daddr. However, we can have many of
544 * bundles differing by session id. All the bundles grow from a parent
550 struct xfrm_dst *next;
551 struct dst_entry dst;
555 struct dst_entry *route;
556 u32 route_mtu_cached;
557 u32 child_mtu_cached;
562 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
564 dst_release(xdst->route);
565 if (likely(xdst->u.dst.xfrm))
566 xfrm_state_put(xdst->u.dst.xfrm);
569 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
571 /* Decapsulation state, used by the input to store data during
572 * decapsulation procedure, to be used later (during the policy
575 struct xfrm_decap_state {
580 struct sec_decap_state {
581 struct xfrm_state *xvec;
582 struct xfrm_decap_state decap;
589 struct sec_decap_state x[XFRM_MAX_DEPTH];
592 static inline struct sec_path *
593 secpath_get(struct sec_path *sp)
596 atomic_inc(&sp->refcnt);
600 extern void __secpath_destroy(struct sec_path *sp);
603 secpath_put(struct sec_path *sp)
605 if (sp && atomic_dec_and_test(&sp->refcnt))
606 __secpath_destroy(sp);
609 extern struct sec_path *secpath_dup(struct sec_path *src);
612 secpath_reset(struct sk_buff *skb)
615 secpath_put(skb->sp);
621 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
623 return (tmpl->saddr.a4 &&
624 tmpl->saddr.a4 != x->props.saddr.a4);
628 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
630 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
631 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
635 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
639 return __xfrm4_state_addr_cmp(tmpl, x);
641 return __xfrm6_state_addr_cmp(tmpl, x);
648 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
650 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
652 if (sk && sk->sk_policy[XFRM_POLICY_IN])
653 return __xfrm_policy_check(sk, dir, skb, family);
655 return (!xfrm_policy_list[dir] && !skb->sp) ||
656 (skb->dst->flags & DST_NOPOLICY) ||
657 __xfrm_policy_check(sk, dir, skb, family);
660 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
662 return xfrm_policy_check(sk, dir, skb, AF_INET);
665 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
667 return xfrm_policy_check(sk, dir, skb, AF_INET6);
671 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
673 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
675 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
676 (skb->dst->flags & DST_NOXFRM) ||
677 __xfrm_route_forward(skb, family);
680 static inline int xfrm4_route_forward(struct sk_buff *skb)
682 return xfrm_route_forward(skb, AF_INET);
685 static inline int xfrm6_route_forward(struct sk_buff *skb)
687 return xfrm_route_forward(skb, AF_INET6);
690 extern int __xfrm_sk_clone_policy(struct sock *sk);
692 static inline int xfrm_sk_clone_policy(struct sock *sk)
694 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
695 return __xfrm_sk_clone_policy(sk);
699 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
701 static inline void xfrm_sk_free_policy(struct sock *sk)
703 if (unlikely(sk->sk_policy[0] != NULL)) {
704 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
705 sk->sk_policy[0] = NULL;
707 if (unlikely(sk->sk_policy[1] != NULL)) {
708 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
709 sk->sk_policy[1] = NULL;
715 static inline void xfrm_sk_free_policy(struct sock *sk) {}
716 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
717 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
718 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
719 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
723 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
727 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
734 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
738 return (xfrm_address_t *)&fl->fl4_dst;
740 return (xfrm_address_t *)&fl->fl6_dst;
746 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
750 return (xfrm_address_t *)&fl->fl4_src;
752 return (xfrm_address_t *)&fl->fl6_src;
757 static __inline__ int
758 __xfrm4_state_addr_check(struct xfrm_state *x,
759 xfrm_address_t *daddr, xfrm_address_t *saddr)
761 if (daddr->a4 == x->id.daddr.a4 &&
762 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
767 static __inline__ int
768 __xfrm6_state_addr_check(struct xfrm_state *x,
769 xfrm_address_t *daddr, xfrm_address_t *saddr)
771 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
772 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
773 ipv6_addr_any((struct in6_addr *)saddr) ||
774 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
779 static __inline__ int
780 xfrm_state_addr_check(struct xfrm_state *x,
781 xfrm_address_t *daddr, xfrm_address_t *saddr,
782 unsigned short family)
786 return __xfrm4_state_addr_check(x, daddr, saddr);
788 return __xfrm6_state_addr_check(x, daddr, saddr);
793 static inline int xfrm_state_kern(struct xfrm_state *x)
795 return atomic_read(&x->tunnel_users);
799 * xfrm algorithm information
801 struct xfrm_algo_auth_info {
806 struct xfrm_algo_encr_info {
811 struct xfrm_algo_comp_info {
815 struct xfrm_algo_desc {
819 struct xfrm_algo_auth_info auth;
820 struct xfrm_algo_encr_info encr;
821 struct xfrm_algo_comp_info comp;
823 struct sadb_alg desc;
826 /* XFRM tunnel handlers. */
828 int (*handler)(struct sk_buff *skb);
829 void (*err_handler)(struct sk_buff *skb, __u32 info);
832 struct xfrm6_tunnel {
833 int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp);
834 void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
835 int type, int code, int offset, __u32 info);
838 extern void xfrm_init(void);
839 extern void xfrm4_init(void);
840 extern void xfrm6_init(void);
841 extern void xfrm6_fini(void);
842 extern void xfrm_state_init(void);
843 extern void xfrm4_state_init(void);
844 extern void xfrm6_state_init(void);
845 extern void xfrm6_state_fini(void);
847 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
848 extern struct xfrm_state *xfrm_state_alloc(void);
849 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
850 struct flowi *fl, struct xfrm_tmpl *tmpl,
851 struct xfrm_policy *pol, int *err,
852 unsigned short family);
853 extern int xfrm_state_check_expire(struct xfrm_state *x);
854 extern void xfrm_state_insert(struct xfrm_state *x);
855 extern int xfrm_state_add(struct xfrm_state *x);
856 extern int xfrm_state_update(struct xfrm_state *x);
857 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
858 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
859 extern int xfrm_state_delete(struct xfrm_state *x);
860 extern void xfrm_state_flush(u8 proto);
861 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
862 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
863 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
864 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
865 extern int xfrm_init_state(struct xfrm_state *x);
866 extern int xfrm4_rcv(struct sk_buff *skb);
867 extern int xfrm4_output(struct sk_buff *skb);
868 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
869 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
870 extern int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi);
871 extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
872 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
873 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
874 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
875 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
876 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
877 extern int xfrm6_output(struct sk_buff *skb);
880 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
881 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
882 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
884 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
889 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
891 /* should not happen */
895 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
901 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
902 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
903 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
904 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
905 struct xfrm_sec_ctx *ctx, int delete);
906 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
907 void xfrm_policy_flush(void);
908 u32 xfrm_get_acqseq(void);
909 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
910 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
911 xfrm_address_t *daddr, xfrm_address_t *saddr,
912 int create, unsigned short family);
913 extern void xfrm_policy_flush(void);
914 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
915 extern int xfrm_flush_bundles(void);
916 extern void xfrm_flush_all_bundles(void);
917 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
918 extern void xfrm_init_pmtu(struct dst_entry *dst);
920 extern wait_queue_head_t km_waitq;
921 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
922 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard);
924 extern void xfrm_input_init(void);
925 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
927 extern void xfrm_probe_algs(void);
928 extern int xfrm_count_auth_supported(void);
929 extern int xfrm_count_enc_supported(void);
930 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
931 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
932 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
933 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
934 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
935 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
936 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
937 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
940 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
942 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
943 int offset, int len, icv_update_fn_t icv_update);
945 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
951 return a->a4 - b->a4;
953 return ipv6_addr_cmp((struct in6_addr *)a,
954 (struct in6_addr *)b);
958 static inline int xfrm_policy_id2dir(u32 index)
963 #endif /* _NET_XFRM_H */