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>
14 #include <linux/mutex.h>
18 #include <net/route.h>
20 #include <net/ip6_fib.h>
22 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
24 extern struct sock *xfrm_nl;
25 extern u32 sysctl_xfrm_aevent_etime;
26 extern u32 sysctl_xfrm_aevent_rseqth;
28 extern struct mutex xfrm_cfg_mutex;
30 /* Organization of SPD aka "XFRM rules"
31 ------------------------------------
34 - policy rule, struct xfrm_policy (=SPD entry)
35 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
36 - instance of a transformer, struct xfrm_state (=SA)
37 - template to clone xfrm_state, struct xfrm_tmpl
39 SPD is plain linear list of xfrm_policy rules, ordered by priority.
40 (To be compatible with existing pfkeyv2 implementations,
41 many rules with priority of 0x7fffffff are allowed to exist and
42 such rules are ordered in an unpredictable way, thanks to bsd folks.)
44 Lookup is plain linear search until the first match with selector.
46 If "action" is "block", then we prohibit the flow, otherwise:
47 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
48 policy entry has list of up to XFRM_MAX_DEPTH transformations,
49 described by templates xfrm_tmpl. Each template is resolved
50 to a complete xfrm_state (see below) and we pack bundle of transformations
51 to a dst_entry returned to requestor.
53 dst -. xfrm .-> xfrm_state #1
54 |---. child .-> dst -. xfrm .-> xfrm_state #2
55 |---. child .-> dst -. xfrm .-> xfrm_state #3
58 Bundles are cached at xrfm_policy struct (field ->bundles).
61 Resolution of xrfm_tmpl
62 -----------------------
64 1. ->mode Mode: transport or tunnel
65 2. ->id.proto Protocol: AH/ESP/IPCOMP
66 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
67 Q: allow to resolve security gateway?
68 4. ->id.spi If not zero, static SPI.
69 5. ->saddr Local tunnel endpoint, ignored for transport mode.
70 6. ->algos List of allowed algos. Plain bitmask now.
71 Q: ealgos, aalgos, calgos. What a mess...
72 7. ->share Sharing mode.
73 Q: how to implement private sharing mode? To add struct sock* to
76 Having this template we search through SAD searching for entries
77 with appropriate mode/proto/algo, permitted by selector.
78 If no appropriate entry found, it is requested from key manager.
81 Q: How to find all the bundles referring to a physical path for
82 PMTU discovery? Seems, dst should contain list of all parents...
83 and enter to infinite locking hierarchy disaster.
84 No! It is easier, we will not search for them, let them find us.
85 We add genid to each dst plus pointer to genid of raw IP route,
86 pmtu disc will update pmtu on raw IP route and increase its genid.
87 dst_check() will see this for top level and trigger resyncing
88 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
91 /* Full description of state of transformer. */
94 /* Note: bydst is re-used during gc */
95 struct list_head bydst;
96 struct list_head byspi;
102 struct xfrm_selector sel;
104 /* Key manger bits */
111 /* Parameters of this state. */
116 u8 aalgo, ealgo, calgo;
119 xfrm_address_t saddr;
124 struct xfrm_lifetime_cfg lft;
126 /* Data for transformer */
127 struct xfrm_algo *aalg;
128 struct xfrm_algo *ealg;
129 struct xfrm_algo *calg;
131 /* Data for encapsulator */
132 struct xfrm_encap_tmpl *encap;
134 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
135 struct xfrm_state *tunnel;
137 /* If a tunnel, number of users + 1 */
138 atomic_t tunnel_users;
140 /* State for replay detection */
141 struct xfrm_replay_state replay;
143 /* Replay detection state at the time we sent the last notification */
144 struct xfrm_replay_state preplay;
146 /* Replay detection notification settings */
150 /* Replay detection notification timer */
151 struct timer_list rtimer;
154 struct xfrm_stats stats;
156 struct xfrm_lifetime_cur curlft;
157 struct timer_list timer;
159 /* Reference to data common to all the instances of this
161 struct xfrm_type *type;
163 /* Security context */
164 struct xfrm_sec_ctx *security;
166 /* Private data of this transformer, format is opaque,
167 * interpreted by xfrm_type methods. */
180 /* callback structure passed from either netlink or pfkey */
197 struct xfrm_policy_afinfo {
198 unsigned short family;
200 struct xfrm_type_map *type_map;
201 struct dst_ops *dst_ops;
202 void (*garbage_collect)(void);
203 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
204 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
205 int (*bundle_create)(struct xfrm_policy *policy,
206 struct xfrm_state **xfrm,
209 struct dst_entry **dst_p);
210 void (*decode_session)(struct sk_buff *skb,
214 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
215 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
216 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
217 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
218 #define XFRM_ACQ_EXPIRES 30
221 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
222 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
223 extern int __xfrm_state_delete(struct xfrm_state *x);
225 struct xfrm_state_afinfo {
226 unsigned short family;
228 struct list_head *state_bydst;
229 struct list_head *state_byspi;
230 int (*init_flags)(struct xfrm_state *x);
231 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
232 struct xfrm_tmpl *tmpl,
233 xfrm_address_t *daddr, xfrm_address_t *saddr);
234 struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
235 struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
236 xfrm_address_t *daddr, xfrm_address_t *saddr,
240 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
241 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
243 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
245 struct xfrm_decap_state;
249 struct module *owner;
252 int (*init_state)(struct xfrm_state *x);
253 void (*destructor)(struct xfrm_state *);
254 int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
255 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
256 /* Estimate maximal size of result of transformation of a dgram */
257 u32 (*get_max_size)(struct xfrm_state *, int size);
260 struct xfrm_type_map {
262 struct xfrm_type *map[256];
265 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
266 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
267 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
268 extern void xfrm_put_type(struct xfrm_type *type);
272 /* id in template is interpreted as:
273 * daddr - destination of tunnel, may be zero for transport mode.
274 * spi - zero to acquire spi. Not zero if spi is static, then
275 * daddr must be fixed too.
276 * proto - AH/ESP/IPCOMP
280 /* Source address of tunnel. Ignored, if it is not a tunnel. */
281 xfrm_address_t saddr;
285 /* Mode: transport/tunnel */
288 /* Sharing mode: unique, this session only, this user only etc. */
291 /* May skip this transfomration if no SA is found */
294 /* Bit mask of algos allowed for acquisition */
300 #define XFRM_MAX_DEPTH 4
304 struct xfrm_policy *next;
305 struct list_head list;
307 /* This lock only affects elements except for entry. */
310 struct timer_list timer;
314 struct xfrm_selector selector;
315 struct xfrm_lifetime_cfg lft;
316 struct xfrm_lifetime_cur curlft;
317 struct dst_entry *bundles;
323 struct xfrm_sec_ctx *security;
324 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
327 #define XFRM_KM_TIMEOUT 30
329 #define XFRM_REPLAY_SEQ 1
330 #define XFRM_REPLAY_OSEQ 2
331 #define XFRM_REPLAY_SEQ_MASK 3
333 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
334 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
336 /* default aevent timeout in units of 100ms */
337 #define XFRM_AE_ETIME 10
338 /* Async Event timer multiplier */
339 #define XFRM_AE_ETH_M 10
340 /* default seq threshold size */
341 #define XFRM_AE_SEQT_SIZE 2
345 struct list_head list;
347 int (*notify)(struct xfrm_state *x, struct km_event *c);
348 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
349 struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
350 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
351 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
354 extern int xfrm_register_km(struct xfrm_mgr *km);
355 extern int xfrm_unregister_km(struct xfrm_mgr *km);
358 extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
360 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
362 if (likely(policy != NULL))
363 atomic_inc(&policy->refcnt);
366 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
368 static inline void xfrm_pol_put(struct xfrm_policy *policy)
370 if (atomic_dec_and_test(&policy->refcnt))
371 __xfrm_policy_destroy(policy);
374 #define XFRM_DST_HSIZE 1024
377 unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
381 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
386 unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
389 h = ntohl(addr->a6[2]^addr->a6[3]);
390 h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
395 unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
399 return __xfrm4_dst_hash(addr);
401 return __xfrm6_dst_hash(addr);
407 unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
410 h = ntohl(addr->a4^spi^proto);
411 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
416 unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
419 h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
420 h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
425 unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
429 return __xfrm4_spi_hash(addr, spi, proto);
431 return __xfrm6_spi_hash(addr, spi, proto);
436 extern void __xfrm_state_destroy(struct xfrm_state *);
438 static inline void __xfrm_state_put(struct xfrm_state *x)
440 atomic_dec(&x->refcnt);
443 static inline void xfrm_state_put(struct xfrm_state *x)
445 if (atomic_dec_and_test(&x->refcnt))
446 __xfrm_state_destroy(x);
449 static inline void xfrm_state_hold(struct xfrm_state *x)
451 atomic_inc(&x->refcnt);
454 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
461 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
462 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
465 if (memcmp(a1, a2, pdw << 2))
471 mask = htonl((0xffffffff) << (32 - pbi));
473 if ((a1[pdw] ^ a2[pdw]) & mask)
481 u16 xfrm_flowi_sport(struct flowi *fl)
488 port = fl->fl_ip_sport;
492 port = htons(fl->fl_icmp_type);
501 u16 xfrm_flowi_dport(struct flowi *fl)
508 port = fl->fl_ip_dport;
512 port = htons(fl->fl_icmp_code);
521 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
523 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
524 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
525 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
526 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
527 (fl->proto == sel->proto || !sel->proto) &&
528 (fl->oif == sel->ifindex || !sel->ifindex);
532 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
534 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
535 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
536 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
537 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
538 (fl->proto == sel->proto || !sel->proto) &&
539 (fl->oif == sel->ifindex || !sel->ifindex);
543 xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
544 unsigned short family)
548 return __xfrm4_selector_match(sel, fl);
550 return __xfrm6_selector_match(sel, fl);
555 #ifdef CONFIG_SECURITY_NETWORK_XFRM
556 /* If neither has a context --> match
557 * Otherwise, both must have a context and the sids, doi, alg must match
559 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
561 return ((!s1 && !s2) ||
563 (s1->ctx_sid == s2->ctx_sid) &&
564 (s1->ctx_doi == s2->ctx_doi) &&
565 (s1->ctx_alg == s2->ctx_alg)));
568 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
574 /* A struct encoding bundle of transformations to apply to some set of flow.
576 * dst->child points to the next element of bundle.
577 * dst->xfrm points to an instanse of transformer.
579 * Due to unfortunate limitations of current routing cache, which we
580 * have no time to fix, it mirrors struct rtable and bound to the same
581 * routing key, including saddr,daddr. However, we can have many of
582 * bundles differing by session id. All the bundles grow from a parent
588 struct xfrm_dst *next;
589 struct dst_entry dst;
593 struct dst_entry *route;
594 u32 route_mtu_cached;
595 u32 child_mtu_cached;
600 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
602 dst_release(xdst->route);
603 if (likely(xdst->u.dst.xfrm))
604 xfrm_state_put(xdst->u.dst.xfrm);
607 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
609 /* Decapsulation state, used by the input to store data during
610 * decapsulation procedure, to be used later (during the policy
613 struct xfrm_decap_state {
618 struct sec_decap_state {
619 struct xfrm_state *xvec;
620 struct xfrm_decap_state decap;
627 struct sec_decap_state x[XFRM_MAX_DEPTH];
630 static inline struct sec_path *
631 secpath_get(struct sec_path *sp)
634 atomic_inc(&sp->refcnt);
638 extern void __secpath_destroy(struct sec_path *sp);
641 secpath_put(struct sec_path *sp)
643 if (sp && atomic_dec_and_test(&sp->refcnt))
644 __secpath_destroy(sp);
647 extern struct sec_path *secpath_dup(struct sec_path *src);
650 secpath_reset(struct sk_buff *skb)
653 secpath_put(skb->sp);
659 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
661 return (tmpl->saddr.a4 &&
662 tmpl->saddr.a4 != x->props.saddr.a4);
666 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
668 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
669 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
673 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
677 return __xfrm4_state_addr_cmp(tmpl, x);
679 return __xfrm6_state_addr_cmp(tmpl, x);
686 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
688 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
690 if (sk && sk->sk_policy[XFRM_POLICY_IN])
691 return __xfrm_policy_check(sk, dir, skb, family);
693 return (!xfrm_policy_list[dir] && !skb->sp) ||
694 (skb->dst->flags & DST_NOPOLICY) ||
695 __xfrm_policy_check(sk, dir, skb, family);
698 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
700 return xfrm_policy_check(sk, dir, skb, AF_INET);
703 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
705 return xfrm_policy_check(sk, dir, skb, AF_INET6);
708 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
709 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
711 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
713 return !xfrm_policy_list[XFRM_POLICY_OUT] ||
714 (skb->dst->flags & DST_NOXFRM) ||
715 __xfrm_route_forward(skb, family);
718 static inline int xfrm4_route_forward(struct sk_buff *skb)
720 return xfrm_route_forward(skb, AF_INET);
723 static inline int xfrm6_route_forward(struct sk_buff *skb)
725 return xfrm_route_forward(skb, AF_INET6);
728 extern int __xfrm_sk_clone_policy(struct sock *sk);
730 static inline int xfrm_sk_clone_policy(struct sock *sk)
732 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
733 return __xfrm_sk_clone_policy(sk);
737 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
739 static inline void xfrm_sk_free_policy(struct sock *sk)
741 if (unlikely(sk->sk_policy[0] != NULL)) {
742 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
743 sk->sk_policy[0] = NULL;
745 if (unlikely(sk->sk_policy[1] != NULL)) {
746 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
747 sk->sk_policy[1] = NULL;
753 static inline void xfrm_sk_free_policy(struct sock *sk) {}
754 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
755 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
756 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
757 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
761 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
765 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
772 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
776 return (xfrm_address_t *)&fl->fl4_dst;
778 return (xfrm_address_t *)&fl->fl6_dst;
784 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
788 return (xfrm_address_t *)&fl->fl4_src;
790 return (xfrm_address_t *)&fl->fl6_src;
795 static __inline__ int
796 __xfrm4_state_addr_check(struct xfrm_state *x,
797 xfrm_address_t *daddr, xfrm_address_t *saddr)
799 if (daddr->a4 == x->id.daddr.a4 &&
800 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
805 static __inline__ int
806 __xfrm6_state_addr_check(struct xfrm_state *x,
807 xfrm_address_t *daddr, xfrm_address_t *saddr)
809 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
810 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
811 ipv6_addr_any((struct in6_addr *)saddr) ||
812 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
817 static __inline__ int
818 xfrm_state_addr_check(struct xfrm_state *x,
819 xfrm_address_t *daddr, xfrm_address_t *saddr,
820 unsigned short family)
824 return __xfrm4_state_addr_check(x, daddr, saddr);
826 return __xfrm6_state_addr_check(x, daddr, saddr);
831 static inline int xfrm_state_kern(struct xfrm_state *x)
833 return atomic_read(&x->tunnel_users);
837 * xfrm algorithm information
839 struct xfrm_algo_auth_info {
844 struct xfrm_algo_encr_info {
849 struct xfrm_algo_comp_info {
853 struct xfrm_algo_desc {
857 struct xfrm_algo_auth_info auth;
858 struct xfrm_algo_encr_info encr;
859 struct xfrm_algo_comp_info comp;
861 struct sadb_alg desc;
864 /* XFRM tunnel handlers. */
866 int (*handler)(struct sk_buff *skb);
867 void (*err_handler)(struct sk_buff *skb, __u32 info);
870 struct xfrm6_tunnel {
871 int (*handler)(struct sk_buff **pskb);
872 void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
873 int type, int code, int offset, __u32 info);
876 extern void xfrm_init(void);
877 extern void xfrm4_init(void);
878 extern void xfrm6_init(void);
879 extern void xfrm6_fini(void);
880 extern void xfrm_state_init(void);
881 extern void xfrm4_state_init(void);
882 extern void xfrm6_state_init(void);
883 extern void xfrm6_state_fini(void);
885 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
886 extern struct xfrm_state *xfrm_state_alloc(void);
887 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
888 struct flowi *fl, struct xfrm_tmpl *tmpl,
889 struct xfrm_policy *pol, int *err,
890 unsigned short family);
891 extern int xfrm_state_check_expire(struct xfrm_state *x);
892 extern void xfrm_state_insert(struct xfrm_state *x);
893 extern int xfrm_state_add(struct xfrm_state *x);
894 extern int xfrm_state_update(struct xfrm_state *x);
895 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
896 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
897 extern int xfrm_state_delete(struct xfrm_state *x);
898 extern void xfrm_state_flush(u8 proto);
899 extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
900 extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
901 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
902 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
903 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
904 extern int xfrm_init_state(struct xfrm_state *x);
905 extern int xfrm4_rcv(struct sk_buff *skb);
906 extern int xfrm4_output(struct sk_buff *skb);
907 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
908 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
909 extern int xfrm6_rcv_spi(struct sk_buff **pskb, u32 spi);
910 extern int xfrm6_rcv(struct sk_buff **pskb);
911 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
912 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
913 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
914 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
915 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
916 extern int xfrm6_output(struct sk_buff *skb);
919 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
920 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
921 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
923 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
928 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
930 /* should not happen */
934 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
940 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
941 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
942 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
943 struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
944 struct xfrm_sec_ctx *ctx, int delete);
945 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
946 void xfrm_policy_flush(void);
947 u32 xfrm_get_acqseq(void);
948 void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
949 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
950 xfrm_address_t *daddr, xfrm_address_t *saddr,
951 int create, unsigned short family);
952 extern void xfrm_policy_flush(void);
953 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
954 extern int xfrm_flush_bundles(void);
955 extern void xfrm_flush_all_bundles(void);
956 extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
957 extern void xfrm_init_pmtu(struct dst_entry *dst);
959 extern wait_queue_head_t km_waitq;
960 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
961 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
963 extern void xfrm_input_init(void);
964 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
966 extern void xfrm_probe_algs(void);
967 extern int xfrm_count_auth_supported(void);
968 extern int xfrm_count_enc_supported(void);
969 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
970 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
971 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
972 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
973 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
974 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
975 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
976 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
979 typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
981 extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
982 int offset, int len, icv_update_fn_t icv_update);
984 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
990 return a->a4 - b->a4;
992 return ipv6_addr_cmp((struct in6_addr *)a,
993 (struct in6_addr *)b);
997 static inline int xfrm_policy_id2dir(u32 index)
1002 static inline int xfrm_aevent_is_on(void)
1008 nlsk = rcu_dereference(xfrm_nl);
1010 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1015 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1017 if (xfrm_aevent_is_on())
1018 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1022 #endif /* _NET_XFRM_H */