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 semaphore xfrm_cfg_sem;
25 /* Organization of SPD aka "XFRM rules"
26 ------------------------------------
29 - policy rule, struct xfrm_policy (=SPD entry)
30 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
31 - instance of a transformer, struct xfrm_state (=SA)
32 - template to clone xfrm_state, struct xfrm_tmpl
34 SPD is plain linear list of xfrm_policy rules, ordered by priority.
35 (To be compatible with existing pfkeyv2 implementations,
36 many rules with priority of 0x7fffffff are allowed to exist and
37 such rules are ordered in an unpredictable way, thanks to bsd folks.)
39 Lookup is plain linear search until the first match with selector.
41 If "action" is "block", then we prohibit the flow, otherwise:
42 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
43 policy entry has list of up to XFRM_MAX_DEPTH transformations,
44 described by templates xfrm_tmpl. Each template is resolved
45 to a complete xfrm_state (see below) and we pack bundle of transformations
46 to a dst_entry returned to requestor.
48 dst -. xfrm .-> xfrm_state #1
49 |---. child .-> dst -. xfrm .-> xfrm_state #2
50 |---. child .-> dst -. xfrm .-> xfrm_state #3
53 Bundles are cached at xrfm_policy struct (field ->bundles).
56 Resolution of xrfm_tmpl
57 -----------------------
59 1. ->mode Mode: transport or tunnel
60 2. ->id.proto Protocol: AH/ESP/IPCOMP
61 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
62 Q: allow to resolve security gateway?
63 4. ->id.spi If not zero, static SPI.
64 5. ->saddr Local tunnel endpoint, ignored for transport mode.
65 6. ->algos List of allowed algos. Plain bitmask now.
66 Q: ealgos, aalgos, calgos. What a mess...
67 7. ->share Sharing mode.
68 Q: how to implement private sharing mode? To add struct sock* to
71 Having this template we search through SAD searching for entries
72 with appropriate mode/proto/algo, permitted by selector.
73 If no appropriate entry found, it is requested from key manager.
76 Q: How to find all the bundles referring to a physical path for
77 PMTU discovery? Seems, dst should contain list of all parents...
78 and enter to infinite locking hierarchy disaster.
79 No! It is easier, we will not search for them, let them find us.
80 We add genid to each dst plus pointer to genid of raw IP route,
81 pmtu disc will update pmtu on raw IP route and increase its genid.
82 dst_check() will see this for top level and trigger resyncing
83 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
86 /* Full description of state of transformer. */
89 /* Note: bydst is re-used during gc */
90 struct list_head bydst;
91 struct list_head byspi;
97 struct xfrm_selector sel;
106 /* Parameters of this state. */
111 u8 aalgo, ealgo, calgo;
114 xfrm_address_t saddr;
119 struct xfrm_lifetime_cfg lft;
121 /* Data for transformer */
122 struct xfrm_algo *aalg;
123 struct xfrm_algo *ealg;
124 struct xfrm_algo *calg;
126 /* Data for encapsulator */
127 struct xfrm_encap_tmpl *encap;
129 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
130 struct xfrm_state *tunnel;
132 /* If a tunnel, number of users + 1 */
133 atomic_t tunnel_users;
135 /* State for replay detection */
136 struct xfrm_replay_state replay;
139 struct xfrm_stats stats;
141 struct xfrm_lifetime_cur curlft;
142 struct timer_list timer;
144 /* Reference to data common to all the instances of this
146 struct xfrm_type *type;
148 /* Security context */
149 struct xfrm_sec_ctx *security;
151 /* Private data of this transformer, format is opaque,
152 * interpreted by xfrm_type methods. */
165 /* callback structure passed from either netlink or pfkey */
181 struct xfrm_policy_afinfo {
182 unsigned short family;
184 struct xfrm_type_map *type_map;
185 struct dst_ops *dst_ops;
186 void (*garbage_collect)(void);
187 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
188 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
189 int (*bundle_create)(struct xfrm_policy *policy,
190 struct xfrm_state **xfrm,
193 struct dst_entry **dst_p);
194 void (*decode_session)(struct sk_buff *skb,
198 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
199 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
200 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
201 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
203 #define XFRM_ACQ_EXPIRES 30
206 struct xfrm_state_afinfo {
207 unsigned short family;
209 struct list_head *state_bydst;
210 struct list_head *state_byspi;
211 int (*init_flags)(struct xfrm_state *x);
212 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
213 struct xfrm_tmpl *tmpl,
214 xfrm_address_t *daddr, xfrm_address_t *saddr);
215 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
216 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
217 xfrm_address_t *daddr, xfrm_address_t *saddr,
221 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
222 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
224 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
226 struct xfrm_decap_state;
230 struct module *owner;
233 int (*init_state)(struct xfrm_state *x);
234 void (*destructor)(struct xfrm_state *);
235 int (*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 atomic_dec(&x->refcnt);
410 static inline void xfrm_state_put(struct xfrm_state *x)
412 if (atomic_dec_and_test(&x->refcnt))
413 __xfrm_state_destroy(x);
416 static inline void xfrm_state_hold(struct xfrm_state *x)
418 atomic_inc(&x->refcnt);
421 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
428 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
429 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
432 if (memcmp(a1, a2, pdw << 2))
438 mask = htonl((0xffffffff) << (32 - pbi));
440 if ((a1[pdw] ^ a2[pdw]) & mask)
448 u16 xfrm_flowi_sport(struct flowi *fl)
455 port = fl->fl_ip_sport;
459 port = htons(fl->fl_icmp_type);
468 u16 xfrm_flowi_dport(struct flowi *fl)
475 port = fl->fl_ip_dport;
479 port = htons(fl->fl_icmp_code);
488 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
490 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
491 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
492 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
493 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
494 (fl->proto == sel->proto || !sel->proto) &&
495 (fl->oif == sel->ifindex || !sel->ifindex);
499 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
501 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
502 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
503 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
504 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
505 (fl->proto == sel->proto || !sel->proto) &&
506 (fl->oif == sel->ifindex || !sel->ifindex);
510 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
511 unsigned short family)
515 return __xfrm4_selector_match(sel, fl);
517 return __xfrm6_selector_match(sel, fl);
522 #ifdef CONFIG_SECURITY_NETWORK_XFRM
523 /* If neither has a context --> match
524 * Otherwise, both must have a context and the sids, doi, alg must match
526 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
528 return ((!s1 && !s2) ||
530 (s1->ctx_sid == s2->ctx_sid) &&
531 (s1->ctx_doi == s2->ctx_doi) &&
532 (s1->ctx_alg == s2->ctx_alg)));
535 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
541 /* A struct encoding bundle of transformations to apply to some set of flow.
543 * dst->child points to the next element of bundle.
544 * dst->xfrm points to an instanse of transformer.
546 * Due to unfortunate limitations of current routing cache, which we
547 * have no time to fix, it mirrors struct rtable and bound to the same
548 * routing key, including saddr,daddr. However, we can have many of
549 * bundles differing by session id. All the bundles grow from a parent
555 struct xfrm_dst *next;
556 struct dst_entry dst;
560 struct dst_entry *route;
561 u32 route_mtu_cached;
562 u32 child_mtu_cached;
567 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
569 dst_release(xdst->route);
570 if (likely(xdst->u.dst.xfrm))
571 xfrm_state_put(xdst->u.dst.xfrm);
574 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
576 /* Decapsulation state, used by the input to store data during
577 * decapsulation procedure, to be used later (during the policy
580 struct xfrm_decap_state {
585 struct sec_decap_state {
586 struct xfrm_state *xvec;
587 struct xfrm_decap_state decap;
594 struct sec_decap_state x[XFRM_MAX_DEPTH];
597 static inline struct sec_path *
598 secpath_get(struct sec_path *sp)
601 atomic_inc(&sp->refcnt);
605 extern void __secpath_destroy(struct sec_path *sp);
608 secpath_put(struct sec_path *sp)
610 if (sp && atomic_dec_and_test(&sp->refcnt))
611 __secpath_destroy(sp);
614 extern struct sec_path *secpath_dup(struct sec_path *src);
617 secpath_reset(struct sk_buff *skb)
620 secpath_put(skb->sp);
626 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
628 return (tmpl->saddr.a4 &&
629 tmpl->saddr.a4 != x->props.saddr.a4);
633 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
635 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
636 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
640 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
644 return __xfrm4_state_addr_cmp(tmpl, x);
646 return __xfrm6_state_addr_cmp(tmpl, x);
653 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
655 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
657 if (sk && sk->sk_policy[XFRM_POLICY_IN])
658 return __xfrm_policy_check(sk, dir, skb, family);
660 return (!xfrm_policy_list[dir] && !skb->sp) ||
661 (skb->dst->flags & DST_NOPOLICY) ||
662 __xfrm_policy_check(sk, dir, skb, family);
665 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
667 return xfrm_policy_check(sk, dir, skb, AF_INET);
670 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
672 return xfrm_policy_check(sk, dir, skb, AF_INET6);
675 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
676 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
678 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
680 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
681 (skb->dst->flags & DST_NOXFRM) ||
682 __xfrm_route_forward(skb, family);
685 static inline int xfrm4_route_forward(struct sk_buff *skb)
687 return xfrm_route_forward(skb, AF_INET);
690 static inline int xfrm6_route_forward(struct sk_buff *skb)
692 return xfrm_route_forward(skb, AF_INET6);
695 extern int __xfrm_sk_clone_policy(struct sock *sk);
697 static inline int xfrm_sk_clone_policy(struct sock *sk)
699 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
700 return __xfrm_sk_clone_policy(sk);
704 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
706 static inline void xfrm_sk_free_policy(struct sock *sk)
708 if (unlikely(sk->sk_policy[0] != NULL)) {
709 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
710 sk->sk_policy[0] = NULL;
712 if (unlikely(sk->sk_policy[1] != NULL)) {
713 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
714 sk->sk_policy[1] = NULL;
720 static inline void xfrm_sk_free_policy(struct sock *sk) {}
721 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
722 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
723 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
724 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
728 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
732 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
739 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
743 return (xfrm_address_t *)&fl->fl4_dst;
745 return (xfrm_address_t *)&fl->fl6_dst;
751 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
755 return (xfrm_address_t *)&fl->fl4_src;
757 return (xfrm_address_t *)&fl->fl6_src;
762 static __inline__ int
763 __xfrm4_state_addr_check(struct xfrm_state *x,
764 xfrm_address_t *daddr, xfrm_address_t *saddr)
766 if (daddr->a4 == x->id.daddr.a4 &&
767 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
772 static __inline__ int
773 __xfrm6_state_addr_check(struct xfrm_state *x,
774 xfrm_address_t *daddr, xfrm_address_t *saddr)
776 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
777 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
778 ipv6_addr_any((struct in6_addr *)saddr) ||
779 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
784 static __inline__ int
785 xfrm_state_addr_check(struct xfrm_state *x,
786 xfrm_address_t *daddr, xfrm_address_t *saddr,
787 unsigned short family)
791 return __xfrm4_state_addr_check(x, daddr, saddr);
793 return __xfrm6_state_addr_check(x, daddr, saddr);
798 static inline int xfrm_state_kern(struct xfrm_state *x)
800 return atomic_read(&x->tunnel_users);
804 * xfrm algorithm information
806 struct xfrm_algo_auth_info {
811 struct xfrm_algo_encr_info {
816 struct xfrm_algo_comp_info {
820 struct xfrm_algo_desc {
824 struct xfrm_algo_auth_info auth;
825 struct xfrm_algo_encr_info encr;
826 struct xfrm_algo_comp_info comp;
828 struct sadb_alg desc;
831 /* XFRM tunnel handlers. */
833 int (*handler)(struct sk_buff *skb);
834 void (*err_handler)(struct sk_buff *skb, __u32 info);
837 struct xfrm6_tunnel {
838 int (*handler)(struct sk_buff **pskb);
839 void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
840 int type, int code, int offset, __u32 info);
843 extern void xfrm_init(void);
844 extern void xfrm4_init(void);
845 extern void xfrm6_init(void);
846 extern void xfrm6_fini(void);
847 extern void xfrm_state_init(void);
848 extern void xfrm4_state_init(void);
849 extern void xfrm6_state_init(void);
850 extern void xfrm6_state_fini(void);
852 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
853 extern struct xfrm_state *xfrm_state_alloc(void);
854 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
855 struct flowi *fl, struct xfrm_tmpl *tmpl,
856 struct xfrm_policy *pol, int *err,
857 unsigned short family);
858 extern int xfrm_state_check_expire(struct xfrm_state *x);
859 extern void xfrm_state_insert(struct xfrm_state *x);
860 extern int xfrm_state_add(struct xfrm_state *x);
861 extern int xfrm_state_update(struct xfrm_state *x);
862 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
863 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
864 extern int xfrm_state_delete(struct xfrm_state *x);
865 extern void xfrm_state_flush(u8 proto);
866 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
867 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
868 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
869 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
870 extern int xfrm_init_state(struct xfrm_state *x);
871 extern int xfrm4_rcv(struct sk_buff *skb);
872 extern int xfrm4_output(struct sk_buff *skb);
873 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
874 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
875 extern int xfrm6_rcv_spi(struct sk_buff **pskb, u32 spi);
876 extern int xfrm6_rcv(struct sk_buff **pskb);
877 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
878 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
879 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
880 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
881 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
882 extern int xfrm6_output(struct sk_buff *skb);
885 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
886 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
887 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
889 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
894 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
896 /* should not happen */
900 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
906 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
907 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
908 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
909 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
910 struct xfrm_sec_ctx *ctx, int delete);
911 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
912 void xfrm_policy_flush(void);
913 u32 xfrm_get_acqseq(void);
914 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
915 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
916 xfrm_address_t *daddr, xfrm_address_t *saddr,
917 int create, unsigned short family);
918 extern void xfrm_policy_flush(void);
919 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
920 extern int xfrm_flush_bundles(void);
921 extern void xfrm_flush_all_bundles(void);
922 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
923 extern void xfrm_init_pmtu(struct dst_entry *dst);
925 extern wait_queue_head_t km_waitq;
926 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
927 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard);
929 extern void xfrm_input_init(void);
930 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
932 extern void xfrm_probe_algs(void);
933 extern int xfrm_count_auth_supported(void);
934 extern int xfrm_count_enc_supported(void);
935 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
936 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
937 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
938 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
939 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
940 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
941 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
942 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
945 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
947 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
948 int offset, int len, icv_update_fn_t icv_update);
950 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
956 return a->a4 - b->a4;
958 return ipv6_addr_cmp((struct in6_addr *)a,
959 (struct in6_addr *)b);
963 static inline int xfrm_policy_id2dir(u32 index)
968 #endif /* _NET_XFRM_H */