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. */
161 /* callback structure passed from either netlink or pfkey */
177 struct xfrm_policy_afinfo {
178 unsigned short family;
180 struct xfrm_type_map *type_map;
181 struct dst_ops *dst_ops;
182 void (*garbage_collect)(void);
183 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
184 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
185 int (*bundle_create)(struct xfrm_policy *policy,
186 struct xfrm_state **xfrm,
189 struct dst_entry **dst_p);
190 void (*decode_session)(struct sk_buff *skb,
194 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
195 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
196 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
197 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
199 #define XFRM_ACQ_EXPIRES 30
202 struct xfrm_state_afinfo {
203 unsigned short family;
205 struct list_head *state_bydst;
206 struct list_head *state_byspi;
207 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
208 struct xfrm_tmpl *tmpl,
209 xfrm_address_t *daddr, xfrm_address_t *saddr);
210 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
211 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
212 xfrm_address_t *daddr, xfrm_address_t *saddr,
216 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
217 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
219 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
221 struct xfrm_decap_state;
225 struct module *owner;
228 int (*init_state)(struct xfrm_state *x, void *args);
229 void (*destructor)(struct xfrm_state *);
230 int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
231 int (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
232 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
233 /* Estimate maximal size of result of transformation of a dgram */
234 u32 (*get_max_size)(struct xfrm_state *, int size);
237 struct xfrm_type_map {
239 struct xfrm_type *map[256];
242 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
243 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
244 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
245 extern void xfrm_put_type(struct xfrm_type *type);
249 /* id in template is interpreted as:
250 * daddr - destination of tunnel, may be zero for transport mode.
251 * spi - zero to acquire spi. Not zero if spi is static, then
252 * daddr must be fixed too.
253 * proto - AH/ESP/IPCOMP
257 /* Source address of tunnel. Ignored, if it is not a tunnel. */
258 xfrm_address_t saddr;
262 /* Mode: transport/tunnel */
265 /* Sharing mode: unique, this session only, this user only etc. */
268 /* May skip this transfomration if no SA is found */
271 /* Bit mask of algos allowed for acquisition */
277 #define XFRM_MAX_DEPTH 4
281 struct xfrm_policy *next;
282 struct list_head list;
284 /* This lock only affects elements except for entry. */
287 struct timer_list timer;
291 struct xfrm_selector selector;
292 struct xfrm_lifetime_cfg lft;
293 struct xfrm_lifetime_cur curlft;
294 struct dst_entry *bundles;
300 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
303 #define XFRM_KM_TIMEOUT 30
307 struct list_head list;
309 int (*notify)(struct xfrm_state *x, struct km_event *c);
310 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
311 struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
312 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
313 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
316 extern int xfrm_register_km(struct xfrm_mgr *km);
317 extern int xfrm_unregister_km(struct xfrm_mgr *km);
320 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
322 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
324 if (likely(policy != NULL))
325 atomic_inc(&policy->refcnt);
328 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
330 static inline void xfrm_pol_put(struct xfrm_policy *policy)
332 if (atomic_dec_and_test(&policy->refcnt))
333 __xfrm_policy_destroy(policy);
336 #define XFRM_DST_HSIZE 1024
339 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
343 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
348 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
351 h = ntohl(addr->a6[2]^addr->a6[3]);
352 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
357 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
361 return __xfrm4_dst_hash(addr);
363 return __xfrm6_dst_hash(addr);
369 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
372 h = ntohl(addr->a4^spi^proto);
373 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
378 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
381 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
382 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
387 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
391 return __xfrm4_spi_hash(addr, spi, proto);
393 return __xfrm6_spi_hash(addr, spi, proto);
398 extern void __xfrm_state_destroy(struct xfrm_state *);
400 static inline void xfrm_state_put(struct xfrm_state *x)
402 if (atomic_dec_and_test(&x->refcnt))
403 __xfrm_state_destroy(x);
406 static inline void xfrm_state_hold(struct xfrm_state *x)
408 atomic_inc(&x->refcnt);
411 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
418 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
419 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
422 if (memcmp(a1, a2, pdw << 2))
428 mask = htonl((0xffffffff) << (32 - pbi));
430 if ((a1[pdw] ^ a2[pdw]) & mask)
438 u16 xfrm_flowi_sport(struct flowi *fl)
445 port = fl->fl_ip_sport;
449 port = htons(fl->fl_icmp_type);
458 u16 xfrm_flowi_dport(struct flowi *fl)
465 port = fl->fl_ip_dport;
469 port = htons(fl->fl_icmp_code);
478 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
480 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
481 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
482 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
483 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
484 (fl->proto == sel->proto || !sel->proto) &&
485 (fl->oif == sel->ifindex || !sel->ifindex);
489 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
491 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
492 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
493 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
494 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
495 (fl->proto == sel->proto || !sel->proto) &&
496 (fl->oif == sel->ifindex || !sel->ifindex);
500 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
501 unsigned short family)
505 return __xfrm4_selector_match(sel, fl);
507 return __xfrm6_selector_match(sel, fl);
512 /* A struct encoding bundle of transformations to apply to some set of flow.
514 * dst->child points to the next element of bundle.
515 * dst->xfrm points to an instanse of transformer.
517 * Due to unfortunate limitations of current routing cache, which we
518 * have no time to fix, it mirrors struct rtable and bound to the same
519 * routing key, including saddr,daddr. However, we can have many of
520 * bundles differing by session id. All the bundles grow from a parent
526 struct xfrm_dst *next;
527 struct dst_entry dst;
531 struct dst_entry *route;
532 u32 route_mtu_cached;
533 u32 child_mtu_cached;
538 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
540 dst_release(xdst->route);
541 if (likely(xdst->u.dst.xfrm))
542 xfrm_state_put(xdst->u.dst.xfrm);
545 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
547 /* Decapsulation state, used by the input to store data during
548 * decapsulation procedure, to be used later (during the policy
551 struct xfrm_decap_state {
556 struct sec_decap_state {
557 struct xfrm_state *xvec;
558 struct xfrm_decap_state decap;
565 struct sec_decap_state x[XFRM_MAX_DEPTH];
568 static inline struct sec_path *
569 secpath_get(struct sec_path *sp)
572 atomic_inc(&sp->refcnt);
576 extern void __secpath_destroy(struct sec_path *sp);
579 secpath_put(struct sec_path *sp)
581 if (sp && atomic_dec_and_test(&sp->refcnt))
582 __secpath_destroy(sp);
585 extern struct sec_path *secpath_dup(struct sec_path *src);
588 secpath_reset(struct sk_buff *skb)
591 secpath_put(skb->sp);
597 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
599 return (tmpl->saddr.a4 &&
600 tmpl->saddr.a4 != x->props.saddr.a4);
604 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
606 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
607 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
611 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
615 return __xfrm4_state_addr_cmp(tmpl, x);
617 return __xfrm6_state_addr_cmp(tmpl, x);
624 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
626 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
628 if (sk && sk->sk_policy[XFRM_POLICY_IN])
629 return __xfrm_policy_check(sk, dir, skb, family);
631 return (!xfrm_policy_list[dir] && !skb->sp) ||
632 (skb->dst->flags & DST_NOPOLICY) ||
633 __xfrm_policy_check(sk, dir, skb, family);
636 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
638 return xfrm_policy_check(sk, dir, skb, AF_INET);
641 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
643 return xfrm_policy_check(sk, dir, skb, AF_INET6);
647 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
649 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
651 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
652 (skb->dst->flags & DST_NOXFRM) ||
653 __xfrm_route_forward(skb, family);
656 static inline int xfrm4_route_forward(struct sk_buff *skb)
658 return xfrm_route_forward(skb, AF_INET);
661 static inline int xfrm6_route_forward(struct sk_buff *skb)
663 return xfrm_route_forward(skb, AF_INET6);
666 extern int __xfrm_sk_clone_policy(struct sock *sk);
668 static inline int xfrm_sk_clone_policy(struct sock *sk)
670 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
671 return __xfrm_sk_clone_policy(sk);
675 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
677 static inline void xfrm_sk_free_policy(struct sock *sk)
679 if (unlikely(sk->sk_policy[0] != NULL)) {
680 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
681 sk->sk_policy[0] = NULL;
683 if (unlikely(sk->sk_policy[1] != NULL)) {
684 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
685 sk->sk_policy[1] = NULL;
691 static inline void xfrm_sk_free_policy(struct sock *sk) {}
692 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
693 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
694 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
695 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
699 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
703 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
710 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
714 return (xfrm_address_t *)&fl->fl4_dst;
716 return (xfrm_address_t *)&fl->fl6_dst;
722 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
726 return (xfrm_address_t *)&fl->fl4_src;
728 return (xfrm_address_t *)&fl->fl6_src;
733 static __inline__ int
734 __xfrm4_state_addr_check(struct xfrm_state *x,
735 xfrm_address_t *daddr, xfrm_address_t *saddr)
737 if (daddr->a4 == x->id.daddr.a4 &&
738 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
743 static __inline__ int
744 __xfrm6_state_addr_check(struct xfrm_state *x,
745 xfrm_address_t *daddr, xfrm_address_t *saddr)
747 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
748 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
749 ipv6_addr_any((struct in6_addr *)saddr) ||
750 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
755 static __inline__ int
756 xfrm_state_addr_check(struct xfrm_state *x,
757 xfrm_address_t *daddr, xfrm_address_t *saddr,
758 unsigned short family)
762 return __xfrm4_state_addr_check(x, daddr, saddr);
764 return __xfrm6_state_addr_check(x, daddr, saddr);
769 static inline int xfrm_state_kern(struct xfrm_state *x)
771 return atomic_read(&x->tunnel_users);
775 * xfrm algorithm information
777 struct xfrm_algo_auth_info {
782 struct xfrm_algo_encr_info {
787 struct xfrm_algo_comp_info {
791 struct xfrm_algo_desc {
795 struct xfrm_algo_auth_info auth;
796 struct xfrm_algo_encr_info encr;
797 struct xfrm_algo_comp_info comp;
799 struct sadb_alg desc;
802 /* XFRM tunnel handlers. */
804 int (*handler)(struct sk_buff *skb);
805 void (*err_handler)(struct sk_buff *skb, void *info);
808 struct xfrm6_tunnel {
809 int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp);
810 void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
811 int type, int code, int offset, __u32 info);
814 extern void xfrm_init(void);
815 extern void xfrm4_init(void);
816 extern void xfrm6_init(void);
817 extern void xfrm6_fini(void);
818 extern void xfrm_state_init(void);
819 extern void xfrm4_state_init(void);
820 extern void xfrm4_state_fini(void);
821 extern void xfrm6_state_init(void);
822 extern void xfrm6_state_fini(void);
824 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
825 extern struct xfrm_state *xfrm_state_alloc(void);
826 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
827 struct flowi *fl, struct xfrm_tmpl *tmpl,
828 struct xfrm_policy *pol, int *err,
829 unsigned short family);
830 extern int xfrm_state_check_expire(struct xfrm_state *x);
831 extern void xfrm_state_insert(struct xfrm_state *x);
832 extern int xfrm_state_add(struct xfrm_state *x);
833 extern int xfrm_state_update(struct xfrm_state *x);
834 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
835 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
836 extern int xfrm_state_delete(struct xfrm_state *x);
837 extern void xfrm_state_flush(u8 proto);
838 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
839 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
840 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
841 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
842 extern int xfrm4_rcv(struct sk_buff *skb);
843 extern int xfrm4_output(struct sk_buff *skb);
844 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
845 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
846 extern int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi);
847 extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
848 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
849 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
850 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
851 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
852 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
853 extern int xfrm6_output(struct sk_buff *skb);
856 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
857 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
858 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
860 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
865 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
867 /* should not happen */
871 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
877 struct xfrm_policy *xfrm_policy_alloc(int gfp);
878 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
879 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
880 struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel,
882 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
883 void xfrm_policy_flush(void);
884 u32 xfrm_get_acqseq(void);
885 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
886 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
887 xfrm_address_t *daddr, xfrm_address_t *saddr,
888 int create, unsigned short family);
889 extern void xfrm_policy_flush(void);
890 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
891 extern int xfrm_flush_bundles(void);
892 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
893 extern void xfrm_init_pmtu(struct dst_entry *dst);
895 extern wait_queue_head_t km_waitq;
896 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
897 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard);
899 extern void xfrm_input_init(void);
900 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
902 extern void xfrm_probe_algs(void);
903 extern int xfrm_count_auth_supported(void);
904 extern int xfrm_count_enc_supported(void);
905 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
906 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
907 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
908 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
909 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
910 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
911 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
912 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
915 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
917 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
918 int offset, int len, icv_update_fn_t icv_update);
920 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
926 return a->a4 - b->a4;
928 return ipv6_addr_cmp((struct in6_addr *)a,
929 (struct in6_addr *)b);
933 #endif /* _NET_XFRM_H */