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);
255 int (*output)(struct sk_buff *skb);
258 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
259 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
260 extern struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family);
261 extern void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
263 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
268 struct module *owner;
271 #define XFRM_TYPE_NON_FRAGMENT 1
273 int (*init_state)(struct xfrm_state *x);
274 void (*destructor)(struct xfrm_state *);
275 int (*input)(struct xfrm_state *, struct sk_buff *skb);
276 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
277 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
278 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
279 xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
280 xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
281 /* Estimate maximal size of result of transformation of a dgram */
282 u32 (*get_mtu)(struct xfrm_state *, int size);
285 extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
286 extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
287 extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
288 extern void xfrm_put_type(struct xfrm_type *type);
291 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
292 int (*output)(struct xfrm_state *x,struct sk_buff *skb);
294 struct module *owner;
298 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
299 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
300 extern struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family);
301 extern void xfrm_put_mode(struct xfrm_mode *mode);
305 /* id in template is interpreted as:
306 * daddr - destination of tunnel, may be zero for transport mode.
307 * spi - zero to acquire spi. Not zero if spi is static, then
308 * daddr must be fixed too.
309 * proto - AH/ESP/IPCOMP
313 /* Source address of tunnel. Ignored, if it is not a tunnel. */
314 xfrm_address_t saddr;
316 unsigned short encap_family;
320 /* Mode: transport, tunnel etc. */
323 /* Sharing mode: unique, this session only, this user only etc. */
326 /* May skip this transfomration if no SA is found */
329 /* Bit mask of algos allowed for acquisition */
335 #define XFRM_MAX_DEPTH 6
339 struct xfrm_policy *next;
340 struct hlist_node bydst;
341 struct hlist_node byidx;
343 /* This lock only affects elements except for entry. */
346 struct timer_list timer;
350 struct xfrm_selector selector;
351 struct xfrm_lifetime_cfg lft;
352 struct xfrm_lifetime_cur curlft;
353 struct dst_entry *bundles;
360 /* XXX 1 byte hole, try to pack */
361 struct xfrm_sec_ctx *security;
362 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
365 struct xfrm_migrate {
366 xfrm_address_t old_daddr;
367 xfrm_address_t old_saddr;
368 xfrm_address_t new_daddr;
369 xfrm_address_t new_saddr;
378 #define XFRM_KM_TIMEOUT 30
380 #define XFRM_REPLAY_SEQ 1
381 #define XFRM_REPLAY_OSEQ 2
382 #define XFRM_REPLAY_SEQ_MASK 3
384 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
385 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
387 /* default aevent timeout in units of 100ms */
388 #define XFRM_AE_ETIME 10
389 /* Async Event timer multiplier */
390 #define XFRM_AE_ETH_M 10
391 /* default seq threshold size */
392 #define XFRM_AE_SEQT_SIZE 2
396 struct list_head list;
398 int (*notify)(struct xfrm_state *x, struct km_event *c);
399 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
400 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
401 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
402 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
403 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
404 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
407 extern int xfrm_register_km(struct xfrm_mgr *km);
408 extern int xfrm_unregister_km(struct xfrm_mgr *km);
410 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
412 /* Audit Information */
419 /* SAD metadata, add more later */
422 u32 sadhcnt; /* current hash bkts */
423 u32 sadhmcnt; /* max allowed hash bkts */
424 u32 sadcnt; /* current running count */
438 #ifdef CONFIG_AUDITSYSCALL
439 extern void xfrm_audit_log(uid_t auid, u32 secid, int type, int result,
440 struct xfrm_policy *xp, struct xfrm_state *x);
442 #define xfrm_audit_log(a,s,t,r,p,x) do { ; } while (0)
443 #endif /* CONFIG_AUDITSYSCALL */
445 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
447 if (likely(policy != NULL))
448 atomic_inc(&policy->refcnt);
451 extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
453 static inline void xfrm_pol_put(struct xfrm_policy *policy)
455 if (atomic_dec_and_test(&policy->refcnt))
456 __xfrm_policy_destroy(policy);
459 #ifdef CONFIG_XFRM_SUB_POLICY
460 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
463 for (i = npols - 1; i >= 0; --i)
464 xfrm_pol_put(pols[i]);
467 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
469 xfrm_pol_put(pols[0]);
473 extern void __xfrm_state_destroy(struct xfrm_state *);
475 static inline void __xfrm_state_put(struct xfrm_state *x)
477 atomic_dec(&x->refcnt);
480 static inline void xfrm_state_put(struct xfrm_state *x)
482 if (atomic_dec_and_test(&x->refcnt))
483 __xfrm_state_destroy(x);
486 static inline void xfrm_state_hold(struct xfrm_state *x)
488 atomic_inc(&x->refcnt);
491 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
498 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
499 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
502 if (memcmp(a1, a2, pdw << 2))
508 mask = htonl((0xffffffff) << (32 - pbi));
510 if ((a1[pdw] ^ a2[pdw]) & mask)
518 __be16 xfrm_flowi_sport(struct flowi *fl)
524 case IPPROTO_UDPLITE:
526 port = fl->fl_ip_sport;
530 port = htons(fl->fl_icmp_type);
532 #ifdef CONFIG_IPV6_MIP6
534 port = htons(fl->fl_mh_type);
544 __be16 xfrm_flowi_dport(struct flowi *fl)
550 case IPPROTO_UDPLITE:
552 port = fl->fl_ip_dport;
556 port = htons(fl->fl_icmp_code);
564 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
565 unsigned short family);
567 #ifdef CONFIG_SECURITY_NETWORK_XFRM
568 /* If neither has a context --> match
569 * Otherwise, both must have a context and the sids, doi, alg must match
571 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
573 return ((!s1 && !s2) ||
575 (s1->ctx_sid == s2->ctx_sid) &&
576 (s1->ctx_doi == s2->ctx_doi) &&
577 (s1->ctx_alg == s2->ctx_alg)));
580 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
586 /* A struct encoding bundle of transformations to apply to some set of flow.
588 * dst->child points to the next element of bundle.
589 * dst->xfrm points to an instanse of transformer.
591 * Due to unfortunate limitations of current routing cache, which we
592 * have no time to fix, it mirrors struct rtable and bound to the same
593 * routing key, including saddr,daddr. However, we can have many of
594 * bundles differing by session id. All the bundles grow from a parent
600 struct xfrm_dst *next;
601 struct dst_entry dst;
605 struct dst_entry *route;
607 u32 route_mtu_cached;
608 u32 child_mtu_cached;
613 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
615 dst_release(xdst->route);
616 if (likely(xdst->u.dst.xfrm))
617 xfrm_state_put(xdst->u.dst.xfrm);
620 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
626 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
629 static inline struct sec_path *
630 secpath_get(struct sec_path *sp)
633 atomic_inc(&sp->refcnt);
637 extern void __secpath_destroy(struct sec_path *sp);
640 secpath_put(struct sec_path *sp)
642 if (sp && atomic_dec_and_test(&sp->refcnt))
643 __secpath_destroy(sp);
646 extern struct sec_path *secpath_dup(struct sec_path *src);
649 secpath_reset(struct sk_buff *skb)
652 secpath_put(skb->sp);
658 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
662 return addr->a4 == 0;
664 return ipv6_addr_any((struct in6_addr *)&addr->a6);
670 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
672 return (tmpl->saddr.a4 &&
673 tmpl->saddr.a4 != x->props.saddr.a4);
677 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
679 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
680 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
684 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
688 return __xfrm4_state_addr_cmp(tmpl, x);
690 return __xfrm6_state_addr_cmp(tmpl, x);
697 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
699 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
701 if (sk && sk->sk_policy[XFRM_POLICY_IN])
702 return __xfrm_policy_check(sk, dir, skb, family);
704 return (!xfrm_policy_count[dir] && !skb->sp) ||
705 (skb->dst->flags & DST_NOPOLICY) ||
706 __xfrm_policy_check(sk, dir, skb, family);
709 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
711 return xfrm_policy_check(sk, dir, skb, AF_INET);
714 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
716 return xfrm_policy_check(sk, dir, skb, AF_INET6);
719 extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
720 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
722 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
724 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
725 (skb->dst->flags & DST_NOXFRM) ||
726 __xfrm_route_forward(skb, family);
729 static inline int xfrm4_route_forward(struct sk_buff *skb)
731 return xfrm_route_forward(skb, AF_INET);
734 static inline int xfrm6_route_forward(struct sk_buff *skb)
736 return xfrm_route_forward(skb, AF_INET6);
739 extern int __xfrm_sk_clone_policy(struct sock *sk);
741 static inline int xfrm_sk_clone_policy(struct sock *sk)
743 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
744 return __xfrm_sk_clone_policy(sk);
748 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
750 static inline void xfrm_sk_free_policy(struct sock *sk)
752 if (unlikely(sk->sk_policy[0] != NULL)) {
753 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
754 sk->sk_policy[0] = NULL;
756 if (unlikely(sk->sk_policy[1] != NULL)) {
757 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
758 sk->sk_policy[1] = NULL;
764 static inline void xfrm_sk_free_policy(struct sock *sk) {}
765 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
766 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
767 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
768 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
772 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
776 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
783 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
787 return (xfrm_address_t *)&fl->fl4_dst;
789 return (xfrm_address_t *)&fl->fl6_dst;
795 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
799 return (xfrm_address_t *)&fl->fl4_src;
801 return (xfrm_address_t *)&fl->fl6_src;
806 static __inline__ int
807 __xfrm4_state_addr_check(struct xfrm_state *x,
808 xfrm_address_t *daddr, xfrm_address_t *saddr)
810 if (daddr->a4 == x->id.daddr.a4 &&
811 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
816 static __inline__ int
817 __xfrm6_state_addr_check(struct xfrm_state *x,
818 xfrm_address_t *daddr, xfrm_address_t *saddr)
820 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
821 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
822 ipv6_addr_any((struct in6_addr *)saddr) ||
823 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
828 static __inline__ int
829 xfrm_state_addr_check(struct xfrm_state *x,
830 xfrm_address_t *daddr, xfrm_address_t *saddr,
831 unsigned short family)
835 return __xfrm4_state_addr_check(x, daddr, saddr);
837 return __xfrm6_state_addr_check(x, daddr, saddr);
842 static __inline__ int
843 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
844 unsigned short family)
848 return __xfrm4_state_addr_check(x,
849 (xfrm_address_t *)&fl->fl4_dst,
850 (xfrm_address_t *)&fl->fl4_src);
852 return __xfrm6_state_addr_check(x,
853 (xfrm_address_t *)&fl->fl6_dst,
854 (xfrm_address_t *)&fl->fl6_src);
859 static inline int xfrm_state_kern(struct xfrm_state *x)
861 return atomic_read(&x->tunnel_users);
864 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
866 return (!userproto || proto == userproto ||
867 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
868 proto == IPPROTO_ESP ||
869 proto == IPPROTO_COMP)));
873 * xfrm algorithm information
875 struct xfrm_algo_auth_info {
880 struct xfrm_algo_encr_info {
885 struct xfrm_algo_comp_info {
889 struct xfrm_algo_desc {
894 struct xfrm_algo_auth_info auth;
895 struct xfrm_algo_encr_info encr;
896 struct xfrm_algo_comp_info comp;
898 struct sadb_alg desc;
901 /* XFRM tunnel handlers. */
903 int (*handler)(struct sk_buff *skb);
904 int (*err_handler)(struct sk_buff *skb, __u32 info);
906 struct xfrm_tunnel *next;
910 struct xfrm6_tunnel {
911 int (*handler)(struct sk_buff *skb);
912 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
913 int type, int code, int offset, __be32 info);
914 struct xfrm6_tunnel *next;
918 extern void xfrm_init(void);
919 extern void xfrm4_init(void);
920 extern void xfrm6_init(void);
921 extern void xfrm6_fini(void);
922 extern void xfrm_state_init(void);
923 extern void xfrm4_state_init(void);
924 extern void xfrm6_state_init(void);
925 extern void xfrm6_state_fini(void);
927 extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
928 extern struct xfrm_state *xfrm_state_alloc(void);
929 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
930 struct flowi *fl, struct xfrm_tmpl *tmpl,
931 struct xfrm_policy *pol, int *err,
932 unsigned short family);
933 extern int xfrm_state_check_expire(struct xfrm_state *x);
934 extern void xfrm_state_insert(struct xfrm_state *x);
935 extern int xfrm_state_add(struct xfrm_state *x);
936 extern int xfrm_state_update(struct xfrm_state *x);
937 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
938 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
939 #ifdef CONFIG_XFRM_SUB_POLICY
940 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
941 int n, unsigned short family);
942 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
943 int n, unsigned short family);
945 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
946 int n, unsigned short family)
951 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
952 int n, unsigned short family)
957 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
958 extern int xfrm_state_delete(struct xfrm_state *x);
959 extern void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
960 extern void xfrm_sad_getinfo(struct xfrm_sadinfo *si);
961 extern void xfrm_spd_getinfo(struct xfrm_spdinfo *si);
962 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
963 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
964 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
965 extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
966 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
967 extern int xfrm_init_state(struct xfrm_state *x);
968 extern int xfrm4_rcv(struct sk_buff *skb);
969 extern int xfrm4_output(struct sk_buff *skb);
970 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
971 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
972 extern int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi);
973 extern int xfrm6_rcv(struct sk_buff **pskb);
974 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
975 xfrm_address_t *saddr, u8 proto);
976 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
977 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
978 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
979 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
980 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
981 extern int xfrm6_output(struct sk_buff *skb);
982 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
986 extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
987 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
988 extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
990 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
995 static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
997 /* should not happen */
1001 static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
1007 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1008 extern int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), void *);
1009 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1010 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1011 struct xfrm_selector *sel,
1012 struct xfrm_sec_ctx *ctx, int delete,
1014 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1015 void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1016 u32 xfrm_get_acqseq(void);
1017 void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);
1018 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1019 xfrm_address_t *daddr, xfrm_address_t *saddr,
1020 int create, unsigned short family);
1021 extern void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1022 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1023 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1024 struct flowi *fl, int family, int strict);
1025 extern void xfrm_init_pmtu(struct dst_entry *dst);
1027 #ifdef CONFIG_XFRM_MIGRATE
1028 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1029 struct xfrm_migrate *m, int num_bundles);
1030 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1031 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1032 struct xfrm_migrate *m);
1033 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1034 struct xfrm_migrate *m, int num_bundles);
1037 extern wait_queue_head_t km_waitq;
1038 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1039 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1040 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1042 extern void xfrm_input_init(void);
1043 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1045 extern void xfrm_probe_algs(void);
1046 extern int xfrm_count_auth_supported(void);
1047 extern int xfrm_count_enc_supported(void);
1048 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1049 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1050 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1051 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1052 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1053 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1054 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1055 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1059 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1062 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1063 int offset, int len, icv_update_fn_t icv_update);
1065 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1071 return (__force __u32)a->a4 - (__force __u32)b->a4;
1073 return ipv6_addr_cmp((struct in6_addr *)a,
1074 (struct in6_addr *)b);
1078 static inline int xfrm_policy_id2dir(u32 index)
1083 static inline int xfrm_aevent_is_on(void)
1089 nlsk = rcu_dereference(xfrm_nl);
1091 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1096 static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
1098 if (xfrm_aevent_is_on())
1099 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1102 #ifdef CONFIG_XFRM_MIGRATE
1103 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1105 return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL);
1108 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1111 for (i = 0; i < n; i++)
1112 xfrm_state_put(*(states + i));
1115 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1118 for (i = 0; i < n; i++)
1119 xfrm_state_delete(*(states + i));
1123 #endif /* _NET_XFRM_H */