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/pfkeyv2.h>
12 #include <linux/ipsec.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)
23 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
24 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
26 extern struct sock *xfrm_nl;
27 extern u32 sysctl_xfrm_aevent_etime;
28 extern u32 sysctl_xfrm_aevent_rseqth;
30 extern struct mutex xfrm_cfg_mutex;
32 /* Organization of SPD aka "XFRM rules"
33 ------------------------------------
36 - policy rule, struct xfrm_policy (=SPD entry)
37 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
38 - instance of a transformer, struct xfrm_state (=SA)
39 - template to clone xfrm_state, struct xfrm_tmpl
41 SPD is plain linear list of xfrm_policy rules, ordered by priority.
42 (To be compatible with existing pfkeyv2 implementations,
43 many rules with priority of 0x7fffffff are allowed to exist and
44 such rules are ordered in an unpredictable way, thanks to bsd folks.)
46 Lookup is plain linear search until the first match with selector.
48 If "action" is "block", then we prohibit the flow, otherwise:
49 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
50 policy entry has list of up to XFRM_MAX_DEPTH transformations,
51 described by templates xfrm_tmpl. Each template is resolved
52 to a complete xfrm_state (see below) and we pack bundle of transformations
53 to a dst_entry returned to requestor.
55 dst -. xfrm .-> xfrm_state #1
56 |---. child .-> dst -. xfrm .-> xfrm_state #2
57 |---. child .-> dst -. xfrm .-> xfrm_state #3
60 Bundles are cached at xrfm_policy struct (field ->bundles).
63 Resolution of xrfm_tmpl
64 -----------------------
66 1. ->mode Mode: transport or tunnel
67 2. ->id.proto Protocol: AH/ESP/IPCOMP
68 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
69 Q: allow to resolve security gateway?
70 4. ->id.spi If not zero, static SPI.
71 5. ->saddr Local tunnel endpoint, ignored for transport mode.
72 6. ->algos List of allowed algos. Plain bitmask now.
73 Q: ealgos, aalgos, calgos. What a mess...
74 7. ->share Sharing mode.
75 Q: how to implement private sharing mode? To add struct sock* to
78 Having this template we search through SAD searching for entries
79 with appropriate mode/proto/algo, permitted by selector.
80 If no appropriate entry found, it is requested from key manager.
83 Q: How to find all the bundles referring to a physical path for
84 PMTU discovery? Seems, dst should contain list of all parents...
85 and enter to infinite locking hierarchy disaster.
86 No! It is easier, we will not search for them, let them find us.
87 We add genid to each dst plus pointer to genid of raw IP route,
88 pmtu disc will update pmtu on raw IP route and increase its genid.
89 dst_check() will see this for top level and trigger resyncing
90 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
93 /* Full description of state of transformer. */
96 /* Note: bydst is re-used during gc */
97 struct hlist_node bydst;
98 struct hlist_node bysrc;
99 struct hlist_node byspi;
105 struct xfrm_selector sel;
109 /* Key manger bits */
116 /* Parameters of this state. */
121 u8 aalgo, ealgo, calgo;
124 xfrm_address_t saddr;
129 struct xfrm_lifetime_cfg lft;
131 /* Data for transformer */
132 struct xfrm_algo *aalg;
133 struct xfrm_algo *ealg;
134 struct xfrm_algo *calg;
136 /* Data for encapsulator */
137 struct xfrm_encap_tmpl *encap;
139 /* Data for care-of address */
140 xfrm_address_t *coaddr;
142 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
143 struct xfrm_state *tunnel;
145 /* If a tunnel, number of users + 1 */
146 atomic_t tunnel_users;
148 /* State for replay detection */
149 struct xfrm_replay_state replay;
151 /* Replay detection state at the time we sent the last notification */
152 struct xfrm_replay_state preplay;
154 /* internal flag that only holds state for delayed aevent at the
159 /* Replay detection notification settings */
163 /* Replay detection notification timer */
164 struct timer_list rtimer;
167 struct xfrm_stats stats;
169 struct xfrm_lifetime_cur curlft;
170 struct timer_list timer;
175 /* Reference to data common to all the instances of this
177 struct xfrm_type *type;
178 struct xfrm_mode *mode;
180 /* Security context */
181 struct xfrm_sec_ctx *security;
183 /* Private data of this transformer, format is opaque,
184 * interpreted by xfrm_type methods. */
188 /* xflags - make enum if more show up */
189 #define XFRM_TIME_DEFER 1
200 /* callback structure passed from either netlink or pfkey */
218 struct xfrm_policy_afinfo {
219 unsigned short family;
220 struct xfrm_type *type_map[IPPROTO_MAX];
221 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
222 struct dst_ops *dst_ops;
223 void (*garbage_collect)(void);
224 int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
225 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
226 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
227 int (*bundle_create)(struct xfrm_policy *policy,
228 struct xfrm_state **xfrm,
231 struct dst_entry **dst_p);
232 void (*decode_session)(struct sk_buff *skb,
236 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
237 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
238 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
239 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
240 #define XFRM_ACQ_EXPIRES 30
243 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
244 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
245 extern int __xfrm_state_delete(struct xfrm_state *x);
247 struct xfrm_state_afinfo {
248 unsigned short family;
249 int (*init_flags)(struct xfrm_state *x);
250 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
251 struct xfrm_tmpl *tmpl,
252 xfrm_address_t *daddr, xfrm_address_t *saddr);
253 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
254 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
257 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
258 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
260 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
265 struct module *owner;
268 #define XFRM_TYPE_NON_FRAGMENT 1
270 int (*init_state)(struct xfrm_state *x);
271 void (*destructor)(struct xfrm_state *);
272 int (*input)(struct xfrm_state *, struct sk_buff *skb);
273 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
274 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
275 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
276 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
277 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
278 /* Estimate maximal size of result of transformation of a dgram */
279 u32 (*get_max_size)(struct xfrm_state *, int size);
282 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
283 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
284 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
285 extern void xfrm_put_type(struct xfrm_type *type);
288 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
289 int (*output)(struct xfrm_state *x,struct sk_buff *skb);
291 struct module *owner;
295 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
296 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
297 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
298 extern void xfrm_put_mode(struct xfrm_mode *mode);
302 /* id in template is interpreted as:
303 * daddr - destination of tunnel, may be zero for transport mode.
304 * spi - zero to acquire spi. Not zero if spi is static, then
305 * daddr must be fixed too.
306 * proto - AH/ESP/IPCOMP
310 /* Source address of tunnel. Ignored, if it is not a tunnel. */
311 xfrm_address_t saddr;
315 /* Mode: transport, tunnel etc. */
318 /* Sharing mode: unique, this session only, this user only etc. */
321 /* May skip this transfomration if no SA is found */
324 /* Bit mask of algos allowed for acquisition */
330 #define XFRM_MAX_DEPTH 6
334 struct xfrm_policy *next;
335 struct hlist_node bydst;
336 struct hlist_node byidx;
338 /* This lock only affects elements except for entry. */
341 struct timer_list timer;
346 struct xfrm_selector selector;
347 struct xfrm_lifetime_cfg lft;
348 struct xfrm_lifetime_cur curlft;
349 struct dst_entry *bundles;
355 struct xfrm_sec_ctx *security;
356 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
359 #define XFRM_KM_TIMEOUT 30
361 #define XFRM_REPLAY_SEQ 1
362 #define XFRM_REPLAY_OSEQ 2
363 #define XFRM_REPLAY_SEQ_MASK 3
365 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
366 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
368 /* default aevent timeout in units of 100ms */
369 #define XFRM_AE_ETIME 10
370 /* Async Event timer multiplier */
371 #define XFRM_AE_ETH_M 10
372 /* default seq threshold size */
373 #define XFRM_AE_SEQT_SIZE 2
377 struct list_head list;
379 int (*notify)(struct xfrm_state *x, struct km_event *c);
380 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
381 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
382 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
383 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
384 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
387 extern int xfrm_register_km(struct xfrm_mgr *km);
388 extern int xfrm_unregister_km(struct xfrm_mgr *km);
390 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
392 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
394 if (likely(policy != NULL))
395 atomic_inc(&policy->refcnt);
398 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
400 static inline void xfrm_pol_put(struct xfrm_policy *policy)
402 if (atomic_dec_and_test(&policy->refcnt))
403 __xfrm_policy_destroy(policy);
406 #ifdef CONFIG_XFRM_SUB_POLICY
407 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
410 for (i = npols - 1; i >= 0; --i)
411 xfrm_pol_put(pols[i]);
414 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
416 xfrm_pol_put(pols[0]);
420 extern void __xfrm_state_destroy(struct xfrm_state *);
422 static inline void __xfrm_state_put(struct xfrm_state *x)
424 atomic_dec(&x->refcnt);
427 static inline void xfrm_state_put(struct xfrm_state *x)
429 if (atomic_dec_and_test(&x->refcnt))
430 __xfrm_state_destroy(x);
433 static inline void xfrm_state_hold(struct xfrm_state *x)
435 atomic_inc(&x->refcnt);
438 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
445 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
446 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
449 if (memcmp(a1, a2, pdw << 2))
455 mask = htonl((0xffffffff) << (32 - pbi));
457 if ((a1[pdw] ^ a2[pdw]) & mask)
465 __be16 xfrm_flowi_sport(struct flowi *fl)
471 case IPPROTO_UDPLITE:
473 port = fl->fl_ip_sport;
477 port = htons(fl->fl_icmp_type);
479 #ifdef CONFIG_IPV6_MIP6
481 port = htons(fl->fl_mh_type);
491 __be16 xfrm_flowi_dport(struct flowi *fl)
497 case IPPROTO_UDPLITE:
499 port = fl->fl_ip_dport;
503 port = htons(fl->fl_icmp_code);
511 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
512 unsigned short family);
514 #ifdef CONFIG_SECURITY_NETWORK_XFRM
515 /* If neither has a context --> match
516 * Otherwise, both must have a context and the sids, doi, alg must match
518 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
520 return ((!s1 && !s2) ||
522 (s1->ctx_sid == s2->ctx_sid) &&
523 (s1->ctx_doi == s2->ctx_doi) &&
524 (s1->ctx_alg == s2->ctx_alg)));
527 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
533 /* A struct encoding bundle of transformations to apply to some set of flow.
535 * dst->child points to the next element of bundle.
536 * dst->xfrm points to an instanse of transformer.
538 * Due to unfortunate limitations of current routing cache, which we
539 * have no time to fix, it mirrors struct rtable and bound to the same
540 * routing key, including saddr,daddr. However, we can have many of
541 * bundles differing by session id. All the bundles grow from a parent
547 struct xfrm_dst *next;
548 struct dst_entry dst;
552 struct dst_entry *route;
554 u32 route_mtu_cached;
555 u32 child_mtu_cached;
560 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
562 dst_release(xdst->route);
563 if (likely(xdst->u.dst.xfrm))
564 xfrm_state_put(xdst->u.dst.xfrm);
567 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
573 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
576 static inline struct sec_path *
577 secpath_get(struct sec_path *sp)
580 atomic_inc(&sp->refcnt);
584 extern void __secpath_destroy(struct sec_path *sp);
587 secpath_put(struct sec_path *sp)
589 if (sp && atomic_dec_and_test(&sp->refcnt))
590 __secpath_destroy(sp);
593 extern struct sec_path *secpath_dup(struct sec_path *src);
596 secpath_reset(struct sk_buff *skb)
599 secpath_put(skb->sp);
605 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
609 return addr->a4 == 0;
611 return ipv6_addr_any((struct in6_addr *)&addr->a6);
617 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
619 return (tmpl->saddr.a4 &&
620 tmpl->saddr.a4 != x->props.saddr.a4);
624 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
626 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
627 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
631 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
635 return __xfrm4_state_addr_cmp(tmpl, x);
637 return __xfrm6_state_addr_cmp(tmpl, x);
644 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
646 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
648 if (sk && sk->sk_policy[XFRM_POLICY_IN])
649 return __xfrm_policy_check(sk, dir, skb, family);
651 return (!xfrm_policy_count[dir] && !skb->sp) ||
652 (skb->dst->flags & DST_NOPOLICY) ||
653 __xfrm_policy_check(sk, dir, skb, family);
656 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
658 return xfrm_policy_check(sk, dir, skb, AF_INET);
661 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
663 return xfrm_policy_check(sk, dir, skb, AF_INET6);
666 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
667 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
669 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
671 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
672 (skb->dst->flags & DST_NOXFRM) ||
673 __xfrm_route_forward(skb, family);
676 static inline int xfrm4_route_forward(struct sk_buff *skb)
678 return xfrm_route_forward(skb, AF_INET);
681 static inline int xfrm6_route_forward(struct sk_buff *skb)
683 return xfrm_route_forward(skb, AF_INET6);
686 extern int __xfrm_sk_clone_policy(struct sock *sk);
688 static inline int xfrm_sk_clone_policy(struct sock *sk)
690 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
691 return __xfrm_sk_clone_policy(sk);
695 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
697 static inline void xfrm_sk_free_policy(struct sock *sk)
699 if (unlikely(sk->sk_policy[0] != NULL)) {
700 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
701 sk->sk_policy[0] = NULL;
703 if (unlikely(sk->sk_policy[1] != NULL)) {
704 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
705 sk->sk_policy[1] = NULL;
711 static inline void xfrm_sk_free_policy(struct sock *sk) {}
712 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
713 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
714 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
715 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
719 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
723 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
730 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
734 return (xfrm_address_t *)&fl->fl4_dst;
736 return (xfrm_address_t *)&fl->fl6_dst;
742 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
746 return (xfrm_address_t *)&fl->fl4_src;
748 return (xfrm_address_t *)&fl->fl6_src;
753 static __inline__ int
754 __xfrm4_state_addr_check(struct xfrm_state *x,
755 xfrm_address_t *daddr, xfrm_address_t *saddr)
757 if (daddr->a4 == x->id.daddr.a4 &&
758 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
763 static __inline__ int
764 __xfrm6_state_addr_check(struct xfrm_state *x,
765 xfrm_address_t *daddr, xfrm_address_t *saddr)
767 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
768 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
769 ipv6_addr_any((struct in6_addr *)saddr) ||
770 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
775 static __inline__ int
776 xfrm_state_addr_check(struct xfrm_state *x,
777 xfrm_address_t *daddr, xfrm_address_t *saddr,
778 unsigned short family)
782 return __xfrm4_state_addr_check(x, daddr, saddr);
784 return __xfrm6_state_addr_check(x, daddr, saddr);
789 static __inline__ int
790 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
791 unsigned short family)
795 return __xfrm4_state_addr_check(x,
796 (xfrm_address_t *)&fl->fl4_dst,
797 (xfrm_address_t *)&fl->fl4_src);
799 return __xfrm6_state_addr_check(x,
800 (xfrm_address_t *)&fl->fl6_dst,
801 (xfrm_address_t *)&fl->fl6_src);
806 static inline int xfrm_state_kern(struct xfrm_state *x)
808 return atomic_read(&x->tunnel_users);
811 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
813 return (!userproto || proto == userproto ||
814 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
815 proto == IPPROTO_ESP ||
816 proto == IPPROTO_COMP)));
820 * xfrm algorithm information
822 struct xfrm_algo_auth_info {
827 struct xfrm_algo_encr_info {
832 struct xfrm_algo_comp_info {
836 struct xfrm_algo_desc {
841 struct xfrm_algo_auth_info auth;
842 struct xfrm_algo_encr_info encr;
843 struct xfrm_algo_comp_info comp;
845 struct sadb_alg desc;
848 /* XFRM tunnel handlers. */
850 int (*handler)(struct sk_buff *skb);
851 int (*err_handler)(struct sk_buff *skb, __u32 info);
853 struct xfrm_tunnel *next;
857 struct xfrm6_tunnel {
858 int (*handler)(struct sk_buff *skb);
859 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
860 int type, int code, int offset, __be32 info);
861 struct xfrm6_tunnel *next;
865 extern void xfrm_init(void);
866 extern void xfrm4_init(void);
867 extern void xfrm6_init(void);
868 extern void xfrm6_fini(void);
869 extern void xfrm_state_init(void);
870 extern void xfrm4_state_init(void);
871 extern void xfrm6_state_init(void);
872 extern void xfrm6_state_fini(void);
874 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
875 extern struct xfrm_state *xfrm_state_alloc(void);
876 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
877 struct flowi *fl, struct xfrm_tmpl *tmpl,
878 struct xfrm_policy *pol, int *err,
879 unsigned short family);
880 extern int xfrm_state_check_expire(struct xfrm_state *x);
881 extern void xfrm_state_insert(struct xfrm_state *x);
882 extern int xfrm_state_add(struct xfrm_state *x);
883 extern int xfrm_state_update(struct xfrm_state *x);
884 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
885 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
886 #ifdef CONFIG_XFRM_SUB_POLICY
887 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
888 int n, unsigned short family);
889 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
890 int n, unsigned short family);
892 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
893 int n, unsigned short family)
898 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
899 int n, unsigned short family)
904 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
905 extern int xfrm_state_delete(struct xfrm_state *x);
906 extern void xfrm_state_flush(u8 proto);
907 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
908 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
909 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
910 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
911 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
912 extern int xfrm_init_state(struct xfrm_state *x);
913 extern int xfrm4_rcv(struct sk_buff *skb);
914 extern int xfrm4_output(struct sk_buff *skb);
915 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
916 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
917 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi);
918 extern int xfrm6_rcv(struct sk_buff **pskb);
919 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
920 xfrm_address_t *saddr, u8 proto);
921 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
922 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
923 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
924 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
925 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
926 extern int xfrm6_output(struct sk_buff *skb);
927 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
931 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
932 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
933 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
935 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
940 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
942 /* should not happen */
946 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
952 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
953 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
954 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
955 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
956 struct xfrm_selector *sel,
957 struct xfrm_sec_ctx *ctx, int delete);
958 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete);
959 void xfrm_policy_flush(u8 type);
960 u32 xfrm_get_acqseq(void);
961 void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);
962 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
963 xfrm_address_t *daddr, xfrm_address_t *saddr,
964 int create, unsigned short family);
965 extern void xfrm_policy_flush(u8 type);
966 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
967 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
968 struct flowi *fl, int family, int strict);
969 extern void xfrm_init_pmtu(struct dst_entry *dst);
971 extern wait_queue_head_t km_waitq;
972 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
973 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
974 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
976 extern void xfrm_input_init(void);
977 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
979 extern void xfrm_probe_algs(void);
980 extern int xfrm_count_auth_supported(void);
981 extern int xfrm_count_enc_supported(void);
982 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
983 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
984 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
985 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
986 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
987 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
988 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
989 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
993 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
996 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
997 int offset, int len, icv_update_fn_t icv_update);
999 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1005 return (__force __u32)a->a4 - (__force __u32)b->a4;
1007 return ipv6_addr_cmp((struct in6_addr *)a,
1008 (struct in6_addr *)b);
1012 static inline int xfrm_policy_id2dir(u32 index)
1017 static inline int xfrm_aevent_is_on(void)
1023 nlsk = rcu_dereference(xfrm_nl);
1025 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1030 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1032 if (xfrm_aevent_is_on())
1033 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1037 #endif /* _NET_XFRM_H */